[mirror_ubuntu-jammy-kernel.git] / drivers / net / ethernet / intel / iavf / iavf_main.c

// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2013 - 2018 Intel Corporation. */

#include "iavf.h"
#include "iavf_prototype.h"
#include "iavf_client.h"
/* All iavf tracepoints are defined by the include below, which must
 * be included exactly once across the whole kernel with
 * CREATE_TRACE_POINTS defined
 */
#define CREATE_TRACE_POINTS
#include "iavf_trace.h"

static int iavf_setup_all_tx_resources(struct iavf_adapter *adapter);
static int iavf_setup_all_rx_resources(struct iavf_adapter *adapter);
static int iavf_close(struct net_device *netdev);
static void iavf_init_get_resources(struct iavf_adapter *adapter);
static int iavf_check_reset_complete(struct iavf_hw *hw);

char iavf_driver_name[] = "iavf";
static const char iavf_driver_string[] =
        "Intel(R) Ethernet Adaptive Virtual Function Network Driver";

static const char iavf_copyright[] =
        "Copyright (c) 2013 - 2018 Intel Corporation.";

/* iavf_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 iavf_pci_tbl[] = {
        {PCI_VDEVICE(INTEL, IAVF_DEV_ID_VF), 0},
        {PCI_VDEVICE(INTEL, IAVF_DEV_ID_VF_HV), 0},
        {PCI_VDEVICE(INTEL, IAVF_DEV_ID_X722_VF), 0},
        {PCI_VDEVICE(INTEL, IAVF_DEV_ID_ADAPTIVE_VF), 0},
        /* required last entry */
        {0, }
};

MODULE_DEVICE_TABLE(pci, iavf_pci_tbl);

MODULE_ALIAS("i40evf");
MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) Ethernet Adaptive Virtual Function Network Driver");
MODULE_LICENSE("GPL v2");

static const struct net_device_ops iavf_netdev_ops;
struct workqueue_struct *iavf_wq;

/**
 * iavf_allocate_dma_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 * @alignment: what to align the allocation to
 **/
enum iavf_status iavf_allocate_dma_mem_d(struct iavf_hw *hw,
                                         struct iavf_dma_mem *mem,
                                         u64 size, u32 alignment)
{
        struct iavf_adapter *adapter = (struct iavf_adapter *)hw->back;

        if (!mem)
                return IAVF_ERR_PARAM;

        mem->size = ALIGN(size, alignment);
        mem->va = dma_alloc_coherent(&adapter->pdev->dev, mem->size,
                                     (dma_addr_t *)&mem->pa, GFP_KERNEL);
        if (mem->va)
                return 0;
        else
                return IAVF_ERR_NO_MEMORY;
}

/**
 * iavf_free_dma_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
enum iavf_status iavf_free_dma_mem_d(struct iavf_hw *hw,
                                     struct iavf_dma_mem *mem)
{
        struct iavf_adapter *adapter = (struct iavf_adapter *)hw->back;

        if (!mem || !mem->va)
                return IAVF_ERR_PARAM;
        dma_free_coherent(&adapter->pdev->dev, mem->size,
                          mem->va, (dma_addr_t)mem->pa);
        return 0;
}

/**
 * iavf_allocate_virt_mem_d - OS specific memory alloc for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to fill out
 * @size: size of memory requested
 **/
enum iavf_status iavf_allocate_virt_mem_d(struct iavf_hw *hw,
                                          struct iavf_virt_mem *mem, u32 size)
{
        if (!mem)
                return IAVF_ERR_PARAM;

        mem->size = size;
        mem->va = kzalloc(size, GFP_KERNEL);

        if (mem->va)
                return 0;
        else
                return IAVF_ERR_NO_MEMORY;
}

/**
 * iavf_free_virt_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
enum iavf_status iavf_free_virt_mem_d(struct iavf_hw *hw,
                                      struct iavf_virt_mem *mem)
{
        if (!mem)
                return IAVF_ERR_PARAM;

        /* it's ok to kfree a NULL pointer */
        kfree(mem->va);

        return 0;
}

/**
 * iavf_lock_timeout - try to lock mutex but give up after timeout
 * @lock: mutex that should be locked
 * @msecs: timeout in msecs
 *
 * Returns 0 on success, negative on failure
 **/
int iavf_lock_timeout(struct mutex *lock, unsigned int msecs)
{
        unsigned int wait, delay = 10;

        for (wait = 0; wait < msecs; wait += delay) {
                if (mutex_trylock(lock))
                        return 0;

                msleep(delay);
        }

        return -1;
}

/**
 * iavf_schedule_reset - Set the flags and schedule a reset event
 * @adapter: board private structure
 **/
void iavf_schedule_reset(struct iavf_adapter *adapter)
{
        if (!(adapter->flags &
              (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED))) {
                adapter->flags |= IAVF_FLAG_RESET_NEEDED;
                queue_work(iavf_wq, &adapter->reset_task);
        }
}

/**
 * iavf_schedule_request_stats - Set the flags and schedule statistics request
 * @adapter: board private structure
 *
 * Sets IAVF_FLAG_AQ_REQUEST_STATS flag so iavf_watchdog_task() will explicitly
 * request and refresh ethtool stats
 **/
void iavf_schedule_request_stats(struct iavf_adapter *adapter)
{
        adapter->aq_required |= IAVF_FLAG_AQ_REQUEST_STATS;
        mod_delayed_work(iavf_wq, &adapter->watchdog_task, 0);
}

/**
 * iavf_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 * @txqueue: queue number that is timing out
 **/
static void iavf_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        adapter->tx_timeout_count++;
        iavf_schedule_reset(adapter);
}

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

        if (!adapter->msix_entries)
                return;

        wr32(hw, IAVF_VFINT_DYN_CTL01, 0);

        iavf_flush(hw);

        synchronize_irq(adapter->msix_entries[0].vector);
}

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

        wr32(hw, IAVF_VFINT_DYN_CTL01, IAVF_VFINT_DYN_CTL01_INTENA_MASK |
                                       IAVF_VFINT_DYN_CTL01_ITR_INDX_MASK);
        wr32(hw, IAVF_VFINT_ICR0_ENA1, IAVF_VFINT_ICR0_ENA1_ADMINQ_MASK);

        iavf_flush(hw);
}

/**
 * iavf_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void iavf_irq_disable(struct iavf_adapter *adapter)
{
        int i;
        struct iavf_hw *hw = &adapter->hw;

        if (!adapter->msix_entries)
                return;

        for (i = 1; i < adapter->num_msix_vectors; i++) {
                wr32(hw, IAVF_VFINT_DYN_CTLN1(i - 1), 0);
                synchronize_irq(adapter->msix_entries[i].vector);
        }
        iavf_flush(hw);
}

/**
 * iavf_irq_enable_queues - Enable interrupt for specified queues
 * @adapter: board private structure
 * @mask: bitmap of queues to enable
 **/
void iavf_irq_enable_queues(struct iavf_adapter *adapter, u32 mask)
{
        struct iavf_hw *hw = &adapter->hw;
        int i;

        for (i = 1; i < adapter->num_msix_vectors; i++) {
                if (mask & BIT(i - 1)) {
                        wr32(hw, IAVF_VFINT_DYN_CTLN1(i - 1),
                             IAVF_VFINT_DYN_CTLN1_INTENA_MASK |
                             IAVF_VFINT_DYN_CTLN1_ITR_INDX_MASK);
                }
        }
}

/**
 * iavf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 * @flush: boolean value whether to run rd32()
 **/
void iavf_irq_enable(struct iavf_adapter *adapter, bool flush)
{
        struct iavf_hw *hw = &adapter->hw;

        iavf_misc_irq_enable(adapter);
        iavf_irq_enable_queues(adapter, ~0);

        if (flush)
                iavf_flush(hw);
}

/**
 * iavf_msix_aq - Interrupt handler for vector 0
 * @irq: interrupt number
 * @data: pointer to netdev
 **/
static irqreturn_t iavf_msix_aq(int irq, void *data)
{
        struct net_device *netdev = data;
        struct iavf_adapter *adapter = netdev_priv(netdev);
        struct iavf_hw *hw = &adapter->hw;

        /* handle non-queue interrupts, these reads clear the registers */
        rd32(hw, IAVF_VFINT_ICR01);
        rd32(hw, IAVF_VFINT_ICR0_ENA1);

        /* schedule work on the private workqueue */
        queue_work(iavf_wq, &adapter->adminq_task);

        return IRQ_HANDLED;
}

/**
 * iavf_msix_clean_rings - MSIX mode Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a q_vector
 **/
static irqreturn_t iavf_msix_clean_rings(int irq, void *data)
{
        struct iavf_q_vector *q_vector = data;

        if (!q_vector->tx.ring && !q_vector->rx.ring)
                return IRQ_HANDLED;

        napi_schedule_irqoff(&q_vector->napi);

        return IRQ_HANDLED;
}

/**
 * iavf_map_vector_to_rxq - associate irqs with rx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @r_idx: queue number
 **/
static void
iavf_map_vector_to_rxq(struct iavf_adapter *adapter, int v_idx, int r_idx)
{
        struct iavf_q_vector *q_vector = &adapter->q_vectors[v_idx];
        struct iavf_ring *rx_ring = &adapter->rx_rings[r_idx];
        struct iavf_hw *hw = &adapter->hw;

        rx_ring->q_vector = q_vector;
        rx_ring->next = q_vector->rx.ring;
        rx_ring->vsi = &adapter->vsi;
        q_vector->rx.ring = rx_ring;
        q_vector->rx.count++;
        q_vector->rx.next_update = jiffies + 1;
        q_vector->rx.target_itr = ITR_TO_REG(rx_ring->itr_setting);
        q_vector->ring_mask |= BIT(r_idx);
        wr32(hw, IAVF_VFINT_ITRN1(IAVF_RX_ITR, q_vector->reg_idx),
             q_vector->rx.current_itr >> 1);
        q_vector->rx.current_itr = q_vector->rx.target_itr;
}

/**
 * iavf_map_vector_to_txq - associate irqs with tx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @t_idx: queue number
 **/
static void
iavf_map_vector_to_txq(struct iavf_adapter *adapter, int v_idx, int t_idx)
{
        struct iavf_q_vector *q_vector = &adapter->q_vectors[v_idx];
        struct iavf_ring *tx_ring = &adapter->tx_rings[t_idx];
        struct iavf_hw *hw = &adapter->hw;

        tx_ring->q_vector = q_vector;
        tx_ring->next = q_vector->tx.ring;
        tx_ring->vsi = &adapter->vsi;
        q_vector->tx.ring = tx_ring;
        q_vector->tx.count++;
        q_vector->tx.next_update = jiffies + 1;
        q_vector->tx.target_itr = ITR_TO_REG(tx_ring->itr_setting);
        q_vector->num_ringpairs++;
        wr32(hw, IAVF_VFINT_ITRN1(IAVF_TX_ITR, q_vector->reg_idx),
             q_vector->tx.target_itr >> 1);
        q_vector->tx.current_itr = q_vector->tx.target_itr;
}

/**
 * iavf_map_rings_to_vectors - Maps descriptor rings to vectors
 * @adapter: board private structure to initialize
 *
 * This function maps descriptor rings to the queue-specific vectors
 * we were allotted through the MSI-X enabling code.  Ideally, we'd have
 * one vector per ring/queue, but on a constrained vector budget, we
 * group the rings as "efficiently" as possible.  You would add new
 * mapping configurations in here.
 **/
static void iavf_map_rings_to_vectors(struct iavf_adapter *adapter)
{
        int rings_remaining = adapter->num_active_queues;
        int ridx = 0, vidx = 0;
        int q_vectors;

        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (; ridx < rings_remaining; ridx++) {
                iavf_map_vector_to_rxq(adapter, vidx, ridx);
                iavf_map_vector_to_txq(adapter, vidx, ridx);

                /* In the case where we have more queues than vectors, continue
                 * round-robin on vectors until all queues are mapped.
                 */
                if (++vidx >= q_vectors)
                        vidx = 0;
        }

        adapter->aq_required |= IAVF_FLAG_AQ_MAP_VECTORS;
}

/**
 * iavf_irq_affinity_notify - Callback for affinity changes
 * @notify: context as to what irq was changed
 * @mask: the new affinity mask
 *
 * This is a callback function used by the irq_set_affinity_notifier function
 * so that we may register to receive changes to the irq affinity masks.
 **/
static void iavf_irq_affinity_notify(struct irq_affinity_notify *notify,
                                     const cpumask_t *mask)
{
        struct iavf_q_vector *q_vector =
                container_of(notify, struct iavf_q_vector, affinity_notify);

        cpumask_copy(&q_vector->affinity_mask, mask);
}

/**
 * iavf_irq_affinity_release - Callback for affinity notifier release
 * @ref: internal core kernel usage
 *
 * This is a callback function used by the irq_set_affinity_notifier function
 * to inform the current notification subscriber that they will no longer
 * receive notifications.
 **/
static void iavf_irq_affinity_release(struct kref *ref) {}

/**
 * iavf_request_traffic_irqs - Initialize MSI-X interrupts
 * @adapter: board private structure
 * @basename: device basename
 *
 * Allocates MSI-X vectors for tx and rx handling, and requests
 * interrupts from the kernel.
 **/
static int
iavf_request_traffic_irqs(struct iavf_adapter *adapter, char *basename)
{
        unsigned int vector, q_vectors;
        unsigned int rx_int_idx = 0, tx_int_idx = 0;
        int irq_num, err;
        int cpu;

        iavf_irq_disable(adapter);
        /* Decrement for Other and TCP Timer vectors */
        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (vector = 0; vector < q_vectors; vector++) {
                struct iavf_q_vector *q_vector = &adapter->q_vectors[vector];

                irq_num = adapter->msix_entries[vector + NONQ_VECS].vector;

                if (q_vector->tx.ring && q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "iavf-%s-TxRx-%d", basename, rx_int_idx++);
                        tx_int_idx++;
                } else if (q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "iavf-%s-rx-%d", basename, rx_int_idx++);
                } else if (q_vector->tx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "iavf-%s-tx-%d", basename, tx_int_idx++);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }
                err = request_irq(irq_num,
                                  iavf_msix_clean_rings,
                                  0,
                                  q_vector->name,
                                  q_vector);
                if (err) {
                        dev_info(&adapter->pdev->dev,
                                 "Request_irq failed, error: %d\n", err);
                        goto free_queue_irqs;
                }
                /* register for affinity change notifications */
                q_vector->affinity_notify.notify = iavf_irq_affinity_notify;
                q_vector->affinity_notify.release =
                                                   iavf_irq_affinity_release;
                irq_set_affinity_notifier(irq_num, &q_vector->affinity_notify);
                /* Spread the IRQ affinity hints across online CPUs. Note that
                 * get_cpu_mask returns a mask with a permanent lifetime so
                 * it's safe to use as a hint for irq_set_affinity_hint.
                 */
                cpu = cpumask_local_spread(q_vector->v_idx, -1);
                irq_set_affinity_hint(irq_num, get_cpu_mask(cpu));
        }

        return 0;

free_queue_irqs:
        while (vector) {
                vector--;
                irq_num = adapter->msix_entries[vector + NONQ_VECS].vector;
                irq_set_affinity_notifier(irq_num, NULL);
                irq_set_affinity_hint(irq_num, NULL);
                free_irq(irq_num, &adapter->q_vectors[vector]);
        }
        return err;
}

/**
 * iavf_request_misc_irq - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vector 0 and requests interrupts from the kernel. This
 * vector is only for the admin queue, and stays active even when the netdev
 * is closed.
 **/
static int iavf_request_misc_irq(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err;

        snprintf(adapter->misc_vector_name,
                 sizeof(adapter->misc_vector_name) - 1, "iavf-%s:mbx",
                 dev_name(&adapter->pdev->dev));
        err = request_irq(adapter->msix_entries[0].vector,
                          &iavf_msix_aq, 0,
                          adapter->misc_vector_name, netdev);
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "request_irq for %s failed: %d\n",
                        adapter->misc_vector_name, err);
                free_irq(adapter->msix_entries[0].vector, netdev);
        }
        return err;
}

/**
 * iavf_free_traffic_irqs - Free MSI-X interrupts
 * @adapter: board private structure
 *
 * Frees all MSI-X vectors other than 0.
 **/
static void iavf_free_traffic_irqs(struct iavf_adapter *adapter)
{
        int vector, irq_num, q_vectors;

        if (!adapter->msix_entries)
                return;

        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (vector = 0; vector < q_vectors; vector++) {
                irq_num = adapter->msix_entries[vector + NONQ_VECS].vector;
                irq_set_affinity_notifier(irq_num, NULL);
                irq_set_affinity_hint(irq_num, NULL);
                free_irq(irq_num, &adapter->q_vectors[vector]);
        }
}

/**
 * iavf_free_misc_irq - Free MSI-X miscellaneous vector
 * @adapter: board private structure
 *
 * Frees MSI-X vector 0.
 **/
static void iavf_free_misc_irq(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        if (!adapter->msix_entries)
                return;

        free_irq(adapter->msix_entries[0].vector, netdev);
}

/**
 * iavf_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void iavf_configure_tx(struct iavf_adapter *adapter)
{
        struct iavf_hw *hw = &adapter->hw;
        int i;

        for (i = 0; i < adapter->num_active_queues; i++)
                adapter->tx_rings[i].tail = hw->hw_addr + IAVF_QTX_TAIL1(i);
}

/**
 * iavf_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void iavf_configure_rx(struct iavf_adapter *adapter)
{
        unsigned int rx_buf_len = IAVF_RXBUFFER_2048;
        struct iavf_hw *hw = &adapter->hw;
        int i;

        /* Legacy Rx will always default to a 2048 buffer size. */
#if (PAGE_SIZE < 8192)
        if (!(adapter->flags & IAVF_FLAG_LEGACY_RX)) {
                struct net_device *netdev = adapter->netdev;

                /* For jumbo frames on systems with 4K pages we have to use
                 * an order 1 page, so we might as well increase the size
                 * of our Rx buffer to make better use of the available space
                 */
                rx_buf_len = IAVF_RXBUFFER_3072;

                /* We use a 1536 buffer size for configurations with
                 * standard Ethernet mtu.  On x86 this gives us enough room
                 * for shared info and 192 bytes of padding.
                 */
                if (!IAVF_2K_TOO_SMALL_WITH_PADDING &&
                    (netdev->mtu <= ETH_DATA_LEN))
                        rx_buf_len = IAVF_RXBUFFER_1536 - NET_IP_ALIGN;
        }
#endif

        for (i = 0; i < adapter->num_active_queues; i++) {
                adapter->rx_rings[i].tail = hw->hw_addr + IAVF_QRX_TAIL1(i);
                adapter->rx_rings[i].rx_buf_len = rx_buf_len;

                if (adapter->flags & IAVF_FLAG_LEGACY_RX)
                        clear_ring_build_skb_enabled(&adapter->rx_rings[i]);
                else
                        set_ring_build_skb_enabled(&adapter->rx_rings[i]);
        }
}

/**
 * iavf_find_vlan - Search filter list for specific vlan filter
 * @adapter: board private structure
 * @vlan: vlan tag
 *
 * Returns ptr to the filter object or NULL. Must be called while holding the
 * mac_vlan_list_lock.
 **/
static struct
iavf_vlan_filter *iavf_find_vlan(struct iavf_adapter *adapter, u16 vlan)
{
        struct iavf_vlan_filter *f;

        list_for_each_entry(f, &adapter->vlan_filter_list, list) {
                if (vlan == f->vlan)
                        return f;
        }
        return NULL;
}

/**
 * iavf_add_vlan - Add a vlan filter to the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
static struct
iavf_vlan_filter *iavf_add_vlan(struct iavf_adapter *adapter, u16 vlan)
{
        struct iavf_vlan_filter *f = NULL;

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        f = iavf_find_vlan(adapter, vlan);
        if (!f) {
                f = kzalloc(sizeof(*f), GFP_ATOMIC);
                if (!f)
                        goto clearout;

                f->vlan = vlan;

                list_add_tail(&f->list, &adapter->vlan_filter_list);
                f->add = true;
                adapter->aq_required |= IAVF_FLAG_AQ_ADD_VLAN_FILTER;
        }

clearout:
        spin_unlock_bh(&adapter->mac_vlan_list_lock);
        return f;
}

/**
 * iavf_del_vlan - Remove a vlan filter from the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 **/
static void iavf_del_vlan(struct iavf_adapter *adapter, u16 vlan)
{
        struct iavf_vlan_filter *f;

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        f = iavf_find_vlan(adapter, vlan);
        if (f) {
                f->remove = true;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_VLAN_FILTER;
        }

        spin_unlock_bh(&adapter->mac_vlan_list_lock);
}

/**
 * iavf_restore_filters
 * @adapter: board private structure
 *
 * Restore existing non MAC filters when VF netdev comes back up
 **/
static void iavf_restore_filters(struct iavf_adapter *adapter)
{
        u16 vid;

        /* re-add all VLAN filters */
        for_each_set_bit(vid, adapter->vsi.active_vlans, VLAN_N_VID)
                iavf_add_vlan(adapter, vid);
}

/**
 * iavf_vlan_rx_add_vid - Add a VLAN filter to a device
 * @netdev: network device struct
 * @proto: unused protocol data
 * @vid: VLAN tag
 **/
static int iavf_vlan_rx_add_vid(struct net_device *netdev,
                                __always_unused __be16 proto, u16 vid)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        if (!VLAN_ALLOWED(adapter))
                return -EIO;

        if (iavf_add_vlan(adapter, vid) == NULL)
                return -ENOMEM;

        set_bit(vid, adapter->vsi.active_vlans);
        return 0;
}

/**
 * iavf_vlan_rx_kill_vid - Remove a VLAN filter from a device
 * @netdev: network device struct
 * @proto: unused protocol data
 * @vid: VLAN tag
 **/
static int iavf_vlan_rx_kill_vid(struct net_device *netdev,
                                 __always_unused __be16 proto, u16 vid)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        iavf_del_vlan(adapter, vid);
        clear_bit(vid, adapter->vsi.active_vlans);

        return 0;
}

/**
 * iavf_find_filter - Search filter list for specific mac filter
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL. Must be called while holding the
 * mac_vlan_list_lock.
 **/
static struct
iavf_mac_filter *iavf_find_filter(struct iavf_adapter *adapter,
                                  const u8 *macaddr)
{
        struct iavf_mac_filter *f;

        if (!macaddr)
                return NULL;

        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                if (ether_addr_equal(macaddr, f->macaddr))
                        return f;
        }
        return NULL;
}

/**
 * iavf_add_filter - Add a mac filter to the filter list
 * @adapter: board private structure
 * @macaddr: the MAC address
 *
 * Returns ptr to the filter object or NULL when no memory available.
 **/
struct iavf_mac_filter *iavf_add_filter(struct iavf_adapter *adapter,
                                        const u8 *macaddr)
{
        struct iavf_mac_filter *f;

        if (!macaddr)
                return NULL;

        f = iavf_find_filter(adapter, macaddr);
        if (!f) {
                f = kzalloc(sizeof(*f), GFP_ATOMIC);
                if (!f)
                        return f;

                ether_addr_copy(f->macaddr, macaddr);

                list_add_tail(&f->list, &adapter->mac_filter_list);
                f->add = true;
                f->is_new_mac = true;
                adapter->aq_required |= IAVF_FLAG_AQ_ADD_MAC_FILTER;
        } else {
                f->remove = false;
        }

        return f;
}

/**
 * iavf_set_mac - NDO callback to set port mac address
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int iavf_set_mac(struct net_device *netdev, void *p)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);
        struct iavf_hw *hw = &adapter->hw;
        struct iavf_mac_filter *f;
        struct sockaddr *addr = p;

        if (!is_valid_ether_addr(addr->sa_data))
                return -EADDRNOTAVAIL;

        if (ether_addr_equal(netdev->dev_addr, addr->sa_data))
                return 0;

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        f = iavf_find_filter(adapter, hw->mac.addr);
        if (f) {
                f->remove = true;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_MAC_FILTER;
        }

        f = iavf_add_filter(adapter, addr->sa_data);

        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        if (f) {
                ether_addr_copy(hw->mac.addr, addr->sa_data);
        }

        return (f == NULL) ? -ENOMEM : 0;
}

/**
 * iavf_addr_sync - Callback for dev_(mc|uc)_sync to add address
 * @netdev: the netdevice
 * @addr: address to add
 *
 * Called by __dev_(mc|uc)_sync when an address needs to be added. We call
 * __dev_(uc|mc)_sync from .set_rx_mode and guarantee to hold the hash lock.
 */
static int iavf_addr_sync(struct net_device *netdev, const u8 *addr)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        if (iavf_add_filter(adapter, addr))
                return 0;
        else
                return -ENOMEM;
}

/**
 * iavf_addr_unsync - Callback for dev_(mc|uc)_sync to remove address
 * @netdev: the netdevice
 * @addr: address to add
 *
 * Called by __dev_(mc|uc)_sync when an address needs to be removed. We call
 * __dev_(uc|mc)_sync from .set_rx_mode and guarantee to hold the hash lock.
 */
static int iavf_addr_unsync(struct net_device *netdev, const u8 *addr)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);
        struct iavf_mac_filter *f;

        /* Under some circumstances, we might receive a request to delete
         * our own device address from our uc list. Because we store the
         * device address in the VSI's MAC/VLAN filter list, we need to ignore
         * such requests and not delete our device address from this list.
         */
        if (ether_addr_equal(addr, netdev->dev_addr))
                return 0;

        f = iavf_find_filter(adapter, addr);
        if (f) {
                f->remove = true;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_MAC_FILTER;
        }
        return 0;
}

/**
 * iavf_set_rx_mode - NDO callback to set the netdev filters
 * @netdev: network interface device structure
 **/
static void iavf_set_rx_mode(struct net_device *netdev)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        spin_lock_bh(&adapter->mac_vlan_list_lock);
        __dev_uc_sync(netdev, iavf_addr_sync, iavf_addr_unsync);
        __dev_mc_sync(netdev, iavf_addr_sync, iavf_addr_unsync);
        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        if (netdev->flags & IFF_PROMISC &&
            !(adapter->flags & IAVF_FLAG_PROMISC_ON))
                adapter->aq_required |= IAVF_FLAG_AQ_REQUEST_PROMISC;
        else if (!(netdev->flags & IFF_PROMISC) &&
                 adapter->flags & IAVF_FLAG_PROMISC_ON)
                adapter->aq_required |= IAVF_FLAG_AQ_RELEASE_PROMISC;

        if (netdev->flags & IFF_ALLMULTI &&
            !(adapter->flags & IAVF_FLAG_ALLMULTI_ON))
                adapter->aq_required |= IAVF_FLAG_AQ_REQUEST_ALLMULTI;
        else if (!(netdev->flags & IFF_ALLMULTI) &&
                 adapter->flags & IAVF_FLAG_ALLMULTI_ON)
                adapter->aq_required |= IAVF_FLAG_AQ_RELEASE_ALLMULTI;
}

/**
 * iavf_napi_enable_all - enable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void iavf_napi_enable_all(struct iavf_adapter *adapter)
{
        int q_idx;
        struct iavf_q_vector *q_vector;
        int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (q_idx = 0; q_idx < q_vectors; q_idx++) {
                struct napi_struct *napi;

                q_vector = &adapter->q_vectors[q_idx];
                napi = &q_vector->napi;
                napi_enable(napi);
        }
}

/**
 * iavf_napi_disable_all - disable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void iavf_napi_disable_all(struct iavf_adapter *adapter)
{
        int q_idx;
        struct iavf_q_vector *q_vector;
        int q_vectors = adapter->num_msix_vectors - NONQ_VECS;

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

/**
 * iavf_configure - set up transmit and receive data structures
 * @adapter: board private structure
 **/
static void iavf_configure(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        iavf_set_rx_mode(netdev);

        iavf_configure_tx(adapter);
        iavf_configure_rx(adapter);
        adapter->aq_required |= IAVF_FLAG_AQ_CONFIGURE_QUEUES;

        for (i = 0; i < adapter->num_active_queues; i++) {
                struct iavf_ring *ring = &adapter->rx_rings[i];

                iavf_alloc_rx_buffers(ring, IAVF_DESC_UNUSED(ring));
        }
}

/**
 * iavf_up_complete - Finish the last steps of bringing up a connection
 * @adapter: board private structure
 *
 * Expects to be called while holding the __IAVF_IN_CRITICAL_TASK bit lock.
 **/
static void iavf_up_complete(struct iavf_adapter *adapter)
{
        iavf_change_state(adapter, __IAVF_RUNNING);
        clear_bit(__IAVF_VSI_DOWN, adapter->vsi.state);

        iavf_napi_enable_all(adapter);

        adapter->aq_required |= IAVF_FLAG_AQ_ENABLE_QUEUES;
        if (CLIENT_ENABLED(adapter))
                adapter->flags |= IAVF_FLAG_CLIENT_NEEDS_OPEN;
        mod_delayed_work(iavf_wq, &adapter->watchdog_task, 0);
}

/**
 * iavf_down - Shutdown the connection processing
 * @adapter: board private structure
 *
 * Expects to be called while holding the __IAVF_IN_CRITICAL_TASK bit lock.
 **/
void iavf_down(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct iavf_vlan_filter *vlf;
        struct iavf_cloud_filter *cf;
        struct iavf_fdir_fltr *fdir;
        struct iavf_mac_filter *f;
        struct iavf_adv_rss *rss;

        if (adapter->state <= __IAVF_DOWN_PENDING)
                return;

        netif_carrier_off(netdev);
        netif_tx_disable(netdev);
        adapter->link_up = false;
        iavf_napi_disable_all(adapter);
        iavf_irq_disable(adapter);

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        /* clear the sync flag on all filters */
        __dev_uc_unsync(adapter->netdev, NULL);
        __dev_mc_unsync(adapter->netdev, NULL);

        /* remove all MAC filters */
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                f->remove = true;
        }

        /* remove all VLAN filters */
        list_for_each_entry(vlf, &adapter->vlan_filter_list, list) {
                vlf->remove = true;
        }

        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        /* remove all cloud filters */
        spin_lock_bh(&adapter->cloud_filter_list_lock);
        list_for_each_entry(cf, &adapter->cloud_filter_list, list) {
                cf->del = true;
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);

        /* remove all Flow Director filters */
        spin_lock_bh(&adapter->fdir_fltr_lock);
        list_for_each_entry(fdir, &adapter->fdir_list_head, list) {
                fdir->state = IAVF_FDIR_FLTR_DEL_REQUEST;
        }
        spin_unlock_bh(&adapter->fdir_fltr_lock);

        /* remove all advance RSS configuration */
        spin_lock_bh(&adapter->adv_rss_lock);
        list_for_each_entry(rss, &adapter->adv_rss_list_head, list)
                rss->state = IAVF_ADV_RSS_DEL_REQUEST;
        spin_unlock_bh(&adapter->adv_rss_lock);

        if (!(adapter->flags & IAVF_FLAG_PF_COMMS_FAILED) &&
            adapter->state != __IAVF_RESETTING) {
                /* cancel any current operation */
                adapter->current_op = VIRTCHNL_OP_UNKNOWN;
                /* Schedule operations to close down the HW. Don't wait
                 * here for this to complete. The watchdog is still running
                 * and it will take care of this.
                 */
                adapter->aq_required = IAVF_FLAG_AQ_DEL_MAC_FILTER;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_VLAN_FILTER;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_CLOUD_FILTER;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_FDIR_FILTER;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_ADV_RSS_CFG;
                adapter->aq_required |= IAVF_FLAG_AQ_DISABLE_QUEUES;
        }

        mod_delayed_work(iavf_wq, &adapter->watchdog_task, 0);
}

/**
 * iavf_acquire_msix_vectors - Setup the MSIX capability
 * @adapter: board private structure
 * @vectors: number of vectors to request
 *
 * Work with the OS to set up the MSIX vectors needed.
 *
 * Returns 0 on success, negative on failure
 **/
static int
iavf_acquire_msix_vectors(struct iavf_adapter *adapter, int vectors)
{
        int err, vector_threshold;

        /* We'll want at least 3 (vector_threshold):
         * 0) Other (Admin Queue and link, mostly)
         * 1) TxQ[0] Cleanup
         * 2) RxQ[0] Cleanup
         */
        vector_threshold = MIN_MSIX_COUNT;

        /* The more we get, the more we will assign to Tx/Rx Cleanup
         * for the separate queues...where Rx Cleanup >= Tx Cleanup.
         * Right now, we simply care about how many we'll get; we'll
         * set them up later while requesting irq's.
         */
        err = pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
                                    vector_threshold, vectors);
        if (err < 0) {
                dev_err(&adapter->pdev->dev, "Unable to allocate MSI-X interrupts\n");
                kfree(adapter->msix_entries);
                adapter->msix_entries = NULL;
                return err;
        }

        /* Adjust for only the vectors we'll use, which is minimum
         * of max_msix_q_vectors + NONQ_VECS, or the number of
         * vectors we were allocated.
         */
        adapter->num_msix_vectors = err;
        return 0;
}

/**
 * iavf_free_queues - Free memory for all rings
 * @adapter: board private structure to initialize
 *
 * Free all of the memory associated with queue pairs.
 **/
static void iavf_free_queues(struct iavf_adapter *adapter)
{
        if (!adapter->vsi_res)
                return;
        adapter->num_active_queues = 0;
        kfree(adapter->tx_rings);
        adapter->tx_rings = NULL;
        kfree(adapter->rx_rings);
        adapter->rx_rings = NULL;
}

/**
 * iavf_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.  The polling_netdev array is
 * intended for Multiqueue, but should work fine with a single queue.
 **/
static int iavf_alloc_queues(struct iavf_adapter *adapter)
{
        int i, num_active_queues;

        /* If we're in reset reallocating queues we don't actually know yet for
         * certain the PF gave us the number of queues we asked for but we'll
         * assume it did.  Once basic reset is finished we'll confirm once we
         * start negotiating config with PF.
         */
        if (adapter->num_req_queues)
                num_active_queues = adapter->num_req_queues;
        else if ((adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ) &&
                 adapter->num_tc)
                num_active_queues = adapter->ch_config.total_qps;
        else
                num_active_queues = min_t(int,
                                          adapter->vsi_res->num_queue_pairs,
                                          (int)(num_online_cpus()));


        adapter->tx_rings = kcalloc(num_active_queues,
                                    sizeof(struct iavf_ring), GFP_KERNEL);
        if (!adapter->tx_rings)
                goto err_out;
        adapter->rx_rings = kcalloc(num_active_queues,
                                    sizeof(struct iavf_ring), GFP_KERNEL);
        if (!adapter->rx_rings)
                goto err_out;

        for (i = 0; i < num_active_queues; i++) {
                struct iavf_ring *tx_ring;
                struct iavf_ring *rx_ring;

                tx_ring = &adapter->tx_rings[i];

                tx_ring->queue_index = i;
                tx_ring->netdev = adapter->netdev;
                tx_ring->dev = &adapter->pdev->dev;
                tx_ring->count = adapter->tx_desc_count;
                tx_ring->itr_setting = IAVF_ITR_TX_DEF;
                if (adapter->flags & IAVF_FLAG_WB_ON_ITR_CAPABLE)
                        tx_ring->flags |= IAVF_TXR_FLAGS_WB_ON_ITR;

                rx_ring = &adapter->rx_rings[i];
                rx_ring->queue_index = i;
                rx_ring->netdev = adapter->netdev;
                rx_ring->dev = &adapter->pdev->dev;
                rx_ring->count = adapter->rx_desc_count;
                rx_ring->itr_setting = IAVF_ITR_RX_DEF;
        }

        adapter->num_active_queues = num_active_queues;

        return 0;

err_out:
        iavf_free_queues(adapter);
        return -ENOMEM;
}

/**
 * iavf_set_interrupt_capability - set MSI-X or FAIL if not supported
 * @adapter: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static int iavf_set_interrupt_capability(struct iavf_adapter *adapter)
{
        int vector, v_budget;
        int pairs = 0;
        int err = 0;

        if (!adapter->vsi_res) {
                err = -EIO;
                goto out;
        }
        pairs = adapter->num_active_queues;

        /* It's easy to be greedy for MSI-X vectors, but it really doesn't do
         * us much good if we have more vectors than CPUs. However, we already
         * limit the total number of queues by the number of CPUs so we do not
         * need any further limiting here.
         */
        v_budget = min_t(int, pairs + NONQ_VECS,
                         (int)adapter->vf_res->max_vectors);

        adapter->msix_entries = kcalloc(v_budget,
                                        sizeof(struct msix_entry), GFP_KERNEL);
        if (!adapter->msix_entries) {
                err = -ENOMEM;
                goto out;
        }

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

        err = iavf_acquire_msix_vectors(adapter, v_budget);

out:
        netif_set_real_num_rx_queues(adapter->netdev, pairs);
        netif_set_real_num_tx_queues(adapter->netdev, pairs);
        return err;
}

/**
 * iavf_config_rss_aq - Configure RSS keys and lut by using AQ commands
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/
static int iavf_config_rss_aq(struct iavf_adapter *adapter)
{
        struct iavf_aqc_get_set_rss_key_data *rss_key =
                (struct iavf_aqc_get_set_rss_key_data *)adapter->rss_key;
        struct iavf_hw *hw = &adapter->hw;
        int ret = 0;

        if (adapter->current_op != VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "Cannot configure RSS, command %d pending\n",
                        adapter->current_op);
                return -EBUSY;
        }

        ret = iavf_aq_set_rss_key(hw, adapter->vsi.id, rss_key);
        if (ret) {
                dev_err(&adapter->pdev->dev, "Cannot set RSS key, err %s aq_err %s\n",
                        iavf_stat_str(hw, ret),
                        iavf_aq_str(hw, hw->aq.asq_last_status));
                return ret;

        }

        ret = iavf_aq_set_rss_lut(hw, adapter->vsi.id, false,
                                  adapter->rss_lut, adapter->rss_lut_size);
        if (ret) {
                dev_err(&adapter->pdev->dev, "Cannot set RSS lut, err %s aq_err %s\n",
                        iavf_stat_str(hw, ret),
                        iavf_aq_str(hw, hw->aq.asq_last_status));
        }

        return ret;

}

/**
 * iavf_config_rss_reg - Configure RSS keys and lut by writing registers
 * @adapter: board private structure
 *
 * Returns 0 on success, negative on failure
 **/
static int iavf_config_rss_reg(struct iavf_adapter *adapter)
{
        struct iavf_hw *hw = &adapter->hw;
        u32 *dw;
        u16 i;

        dw = (u32 *)adapter->rss_key;
        for (i = 0; i <= adapter->rss_key_size / 4; i++)
                wr32(hw, IAVF_VFQF_HKEY(i), dw[i]);

        dw = (u32 *)adapter->rss_lut;
        for (i = 0; i <= adapter->rss_lut_size / 4; i++)
                wr32(hw, IAVF_VFQF_HLUT(i), dw[i]);

        iavf_flush(hw);

        return 0;
}

/**
 * iavf_config_rss - Configure RSS keys and lut
 * @adapter: board private structure
 *
 * Returns 0 on success, negative on failure
 **/
int iavf_config_rss(struct iavf_adapter *adapter)
{

        if (RSS_PF(adapter)) {
                adapter->aq_required |= IAVF_FLAG_AQ_SET_RSS_LUT |
                                        IAVF_FLAG_AQ_SET_RSS_KEY;
                return 0;
        } else if (RSS_AQ(adapter)) {
                return iavf_config_rss_aq(adapter);
        } else {
                return iavf_config_rss_reg(adapter);
        }
}

/**
 * iavf_fill_rss_lut - Fill the lut with default values
 * @adapter: board private structure
 **/
static void iavf_fill_rss_lut(struct iavf_adapter *adapter)
{
        u16 i;

        for (i = 0; i < adapter->rss_lut_size; i++)
                adapter->rss_lut[i] = i % adapter->num_active_queues;
}

/**
 * iavf_init_rss - Prepare for RSS
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/
static int iavf_init_rss(struct iavf_adapter *adapter)
{
        struct iavf_hw *hw = &adapter->hw;
        int ret;

        if (!RSS_PF(adapter)) {
                /* Enable PCTYPES for RSS, TCP/UDP with IPv4/IPv6 */
                if (adapter->vf_res->vf_cap_flags &
                    VIRTCHNL_VF_OFFLOAD_RSS_PCTYPE_V2)
                        adapter->hena = IAVF_DEFAULT_RSS_HENA_EXPANDED;
                else
                        adapter->hena = IAVF_DEFAULT_RSS_HENA;

                wr32(hw, IAVF_VFQF_HENA(0), (u32)adapter->hena);
                wr32(hw, IAVF_VFQF_HENA(1), (u32)(adapter->hena >> 32));
        }

        iavf_fill_rss_lut(adapter);
        netdev_rss_key_fill((void *)adapter->rss_key, adapter->rss_key_size);
        ret = iavf_config_rss(adapter);

        return ret;
}

/**
 * iavf_alloc_q_vectors - Allocate memory for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int iavf_alloc_q_vectors(struct iavf_adapter *adapter)
{
        int q_idx = 0, num_q_vectors;
        struct iavf_q_vector *q_vector;

        num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;
        adapter->q_vectors = kcalloc(num_q_vectors, sizeof(*q_vector),
                                     GFP_KERNEL);
        if (!adapter->q_vectors)
                return -ENOMEM;

        for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
                q_vector = &adapter->q_vectors[q_idx];
                q_vector->adapter = adapter;
                q_vector->vsi = &adapter->vsi;
                q_vector->v_idx = q_idx;
                q_vector->reg_idx = q_idx;
                cpumask_copy(&q_vector->affinity_mask, cpu_possible_mask);
                netif_napi_add(adapter->netdev, &q_vector->napi,
                               iavf_napi_poll, NAPI_POLL_WEIGHT);
        }

        return 0;
}

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

        if (!adapter->q_vectors)
                return;

        num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;
        napi_vectors = adapter->num_active_queues;

        for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
                struct iavf_q_vector *q_vector = &adapter->q_vectors[q_idx];

                if (q_idx < napi_vectors)
                        netif_napi_del(&q_vector->napi);
        }
        kfree(adapter->q_vectors);
        adapter->q_vectors = NULL;
}

/**
 * iavf_reset_interrupt_capability - Reset MSIX setup
 * @adapter: board private structure
 *
 **/
void iavf_reset_interrupt_capability(struct iavf_adapter *adapter)
{
        if (!adapter->msix_entries)
                return;

        pci_disable_msix(adapter->pdev);
        kfree(adapter->msix_entries);
        adapter->msix_entries = NULL;
}

/**
 * iavf_init_interrupt_scheme - Determine if MSIX is supported and init
 * @adapter: board private structure to initialize
 *
 **/
int iavf_init_interrupt_scheme(struct iavf_adapter *adapter)
{
        int err;

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

        rtnl_lock();
        err = iavf_set_interrupt_capability(adapter);
        rtnl_unlock();
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "Unable to setup interrupt capabilities\n");
                goto err_set_interrupt;
        }

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

        /* If we've made it so far while ADq flag being ON, then we haven't
         * bailed out anywhere in middle. And ADq isn't just enabled but actual
         * resources have been allocated in the reset path.
         * Now we can truly claim that ADq is enabled.
         */
        if ((adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ) &&
            adapter->num_tc)
                dev_info(&adapter->pdev->dev, "ADq Enabled, %u TCs created",
                         adapter->num_tc);

        dev_info(&adapter->pdev->dev, "Multiqueue %s: Queue pair count = %u",
                 (adapter->num_active_queues > 1) ? "Enabled" : "Disabled",
                 adapter->num_active_queues);

        return 0;
err_alloc_q_vectors:
        iavf_reset_interrupt_capability(adapter);
err_set_interrupt:
        iavf_free_queues(adapter);
err_alloc_queues:
        return err;
}

/**
 * iavf_free_rss - Free memory used by RSS structs
 * @adapter: board private structure
 **/
static void iavf_free_rss(struct iavf_adapter *adapter)
{
        kfree(adapter->rss_key);
        adapter->rss_key = NULL;

        kfree(adapter->rss_lut);
        adapter->rss_lut = NULL;
}

/**
 * iavf_reinit_interrupt_scheme - Reallocate queues and vectors
 * @adapter: board private structure
 *
 * Returns 0 on success, negative on failure
 **/
static int iavf_reinit_interrupt_scheme(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err;

        if (netif_running(netdev))
                iavf_free_traffic_irqs(adapter);
        iavf_free_misc_irq(adapter);
        iavf_reset_interrupt_capability(adapter);
        iavf_free_q_vectors(adapter);
        iavf_free_queues(adapter);

        err =  iavf_init_interrupt_scheme(adapter);
        if (err)
                goto err;

        netif_tx_stop_all_queues(netdev);

        err = iavf_request_misc_irq(adapter);
        if (err)
                goto err;

        set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);

        iavf_map_rings_to_vectors(adapter);
err:
        return err;
}

/**
 * iavf_process_aq_command - process aq_required flags
 * and sends aq command
 * @adapter: pointer to iavf adapter structure
 *
 * Returns 0 on success
 * Returns error code if no command was sent
 * or error code if the command failed.
 **/
static int iavf_process_aq_command(struct iavf_adapter *adapter)
{
        if (adapter->aq_required & IAVF_FLAG_AQ_GET_CONFIG)
                return iavf_send_vf_config_msg(adapter);
        if (adapter->aq_required & IAVF_FLAG_AQ_DISABLE_QUEUES) {
                iavf_disable_queues(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_MAP_VECTORS) {
                iavf_map_queues(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_MAC_FILTER) {
                iavf_add_ether_addrs(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_VLAN_FILTER) {
                iavf_add_vlans(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_MAC_FILTER) {
                iavf_del_ether_addrs(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_VLAN_FILTER) {
                iavf_del_vlans(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_ENABLE_VLAN_STRIPPING) {
                iavf_enable_vlan_stripping(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_DISABLE_VLAN_STRIPPING) {
                iavf_disable_vlan_stripping(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_CONFIGURE_QUEUES) {
                iavf_configure_queues(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_ENABLE_QUEUES) {
                iavf_enable_queues(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_CONFIGURE_RSS) {
                /* This message goes straight to the firmware, not the
                 * PF, so we don't have to set current_op as we will
                 * not get a response through the ARQ.
                 */
                adapter->aq_required &= ~IAVF_FLAG_AQ_CONFIGURE_RSS;
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_GET_HENA) {
                iavf_get_hena(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_SET_HENA) {
                iavf_set_hena(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_SET_RSS_KEY) {
                iavf_set_rss_key(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_SET_RSS_LUT) {
                iavf_set_rss_lut(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_REQUEST_PROMISC) {
                iavf_set_promiscuous(adapter, FLAG_VF_UNICAST_PROMISC |
                                       FLAG_VF_MULTICAST_PROMISC);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_REQUEST_ALLMULTI) {
                iavf_set_promiscuous(adapter, FLAG_VF_MULTICAST_PROMISC);
                return 0;
        }
        if ((adapter->aq_required & IAVF_FLAG_AQ_RELEASE_PROMISC) ||
            (adapter->aq_required & IAVF_FLAG_AQ_RELEASE_ALLMULTI)) {
                iavf_set_promiscuous(adapter, 0);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_ENABLE_CHANNELS) {
                iavf_enable_channels(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_DISABLE_CHANNELS) {
                iavf_disable_channels(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_CLOUD_FILTER) {
                iavf_add_cloud_filter(adapter);
                return 0;
        }

        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_CLOUD_FILTER) {
                iavf_del_cloud_filter(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_CLOUD_FILTER) {
                iavf_del_cloud_filter(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_CLOUD_FILTER) {
                iavf_add_cloud_filter(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_FDIR_FILTER) {
                iavf_add_fdir_filter(adapter);
                return IAVF_SUCCESS;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_FDIR_FILTER) {
                iavf_del_fdir_filter(adapter);
                return IAVF_SUCCESS;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_ADD_ADV_RSS_CFG) {
                iavf_add_adv_rss_cfg(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_DEL_ADV_RSS_CFG) {
                iavf_del_adv_rss_cfg(adapter);
                return 0;
        }
        if (adapter->aq_required & IAVF_FLAG_AQ_REQUEST_STATS) {
                iavf_request_stats(adapter);
                return 0;
        }

        return -EAGAIN;
}

/**
 * iavf_startup - first step of driver startup
 * @adapter: board private structure
 *
 * Function process __IAVF_STARTUP driver state.
 * When success the state is changed to __IAVF_INIT_VERSION_CHECK
 * when fails the state is changed to __IAVF_INIT_FAILED
 **/
static void iavf_startup(struct iavf_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct iavf_hw *hw = &adapter->hw;
        int err;

        WARN_ON(adapter->state != __IAVF_STARTUP);

        /* driver loaded, probe complete */
        adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
        adapter->flags &= ~IAVF_FLAG_RESET_PENDING;
        err = iavf_set_mac_type(hw);
        if (err) {
                dev_err(&pdev->dev, "Failed to set MAC type (%d)\n", err);
                goto err;
        }

        err = iavf_check_reset_complete(hw);
        if (err) {
                dev_info(&pdev->dev, "Device is still in reset (%d), retrying\n",
                         err);
                goto err;
        }
        hw->aq.num_arq_entries = IAVF_AQ_LEN;
        hw->aq.num_asq_entries = IAVF_AQ_LEN;
        hw->aq.arq_buf_size = IAVF_MAX_AQ_BUF_SIZE;
        hw->aq.asq_buf_size = IAVF_MAX_AQ_BUF_SIZE;

        err = iavf_init_adminq(hw);
        if (err) {
                dev_err(&pdev->dev, "Failed to init Admin Queue (%d)\n", err);
                goto err;
        }
        err = iavf_send_api_ver(adapter);
        if (err) {
                dev_err(&pdev->dev, "Unable to send to PF (%d)\n", err);
                iavf_shutdown_adminq(hw);
                goto err;
        }
        iavf_change_state(adapter, __IAVF_INIT_VERSION_CHECK);
        return;
err:
        iavf_change_state(adapter, __IAVF_INIT_FAILED);
}

/**
 * iavf_init_version_check - second step of driver startup
 * @adapter: board private structure
 *
 * Function process __IAVF_INIT_VERSION_CHECK driver state.
 * When success the state is changed to __IAVF_INIT_GET_RESOURCES
 * when fails the state is changed to __IAVF_INIT_FAILED
 **/
static void iavf_init_version_check(struct iavf_adapter *adapter)
{
        struct pci_dev *pdev = adapter->pdev;
        struct iavf_hw *hw = &adapter->hw;
        int err = -EAGAIN;

        WARN_ON(adapter->state != __IAVF_INIT_VERSION_CHECK);

        if (!iavf_asq_done(hw)) {
                dev_err(&pdev->dev, "Admin queue command never completed\n");
                iavf_shutdown_adminq(hw);
                iavf_change_state(adapter, __IAVF_STARTUP);
                goto err;
        }

        /* aq msg sent, awaiting reply */
        err = iavf_verify_api_ver(adapter);
        if (err) {
                if (err == IAVF_ERR_ADMIN_QUEUE_NO_WORK)
                        err = iavf_send_api_ver(adapter);
                else
                        dev_err(&pdev->dev, "Unsupported PF API version %d.%d, expected %d.%d\n",
                                adapter->pf_version.major,
                                adapter->pf_version.minor,
                                VIRTCHNL_VERSION_MAJOR,
                                VIRTCHNL_VERSION_MINOR);
                goto err;
        }
        err = iavf_send_vf_config_msg(adapter);
        if (err) {
                dev_err(&pdev->dev, "Unable to send config request (%d)\n",
                        err);
                goto err;
        }
        iavf_change_state(adapter, __IAVF_INIT_GET_RESOURCES);
        return;
err:
        iavf_change_state(adapter, __IAVF_INIT_FAILED);
}

/**
 * iavf_init_get_resources - third step of driver startup
 * @adapter: board private structure
 *
 * Function process __IAVF_INIT_GET_RESOURCES driver state and
 * finishes driver initialization procedure.
 * When success the state is changed to __IAVF_DOWN
 * when fails the state is changed to __IAVF_INIT_FAILED
 **/
static void iavf_init_get_resources(struct iavf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        struct iavf_hw *hw = &adapter->hw;
        int err;

        WARN_ON(adapter->state != __IAVF_INIT_GET_RESOURCES);
        /* aq msg sent, awaiting reply */
        if (!adapter->vf_res) {
                adapter->vf_res = kzalloc(IAVF_VIRTCHNL_VF_RESOURCE_SIZE,
                                          GFP_KERNEL);
                if (!adapter->vf_res) {
                        err = -ENOMEM;
                        goto err;
                }
        }
        err = iavf_get_vf_config(adapter);
        if (err == IAVF_ERR_ADMIN_QUEUE_NO_WORK) {
                err = iavf_send_vf_config_msg(adapter);
                goto err;
        } else if (err == IAVF_ERR_PARAM) {
                /* We only get ERR_PARAM if the device is in a very bad
                 * state or if we've been disabled for previous bad
                 * behavior. Either way, we're done now.
                 */
                iavf_shutdown_adminq(hw);
                dev_err(&pdev->dev, "Unable to get VF config due to PF error condition, not retrying\n");
                return;
        }
        if (err) {
                dev_err(&pdev->dev, "Unable to get VF config (%d)\n", err);
                goto err_alloc;
        }

        err = iavf_process_config(adapter);
        if (err)
                goto err_alloc;
        adapter->current_op = VIRTCHNL_OP_UNKNOWN;

        adapter->flags |= IAVF_FLAG_RX_CSUM_ENABLED;

        netdev->netdev_ops = &iavf_netdev_ops;
        iavf_set_ethtool_ops(netdev);
        netdev->watchdog_timeo = 5 * HZ;

        /* MTU range: 68 - 9710 */
        netdev->min_mtu = ETH_MIN_MTU;
        netdev->max_mtu = IAVF_MAX_RXBUFFER - IAVF_PACKET_HDR_PAD;

        if (!is_valid_ether_addr(adapter->hw.mac.addr)) {
                dev_info(&pdev->dev, "Invalid MAC address %pM, using random\n",
                         adapter->hw.mac.addr);
                eth_hw_addr_random(netdev);
                ether_addr_copy(adapter->hw.mac.addr, netdev->dev_addr);
        } else {
                ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
                ether_addr_copy(netdev->perm_addr, adapter->hw.mac.addr);
        }

        adapter->tx_desc_count = IAVF_DEFAULT_TXD;
        adapter->rx_desc_count = IAVF_DEFAULT_RXD;
        err = iavf_init_interrupt_scheme(adapter);
        if (err)
                goto err_sw_init;
        iavf_map_rings_to_vectors(adapter);
        if (adapter->vf_res->vf_cap_flags &
                VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
                adapter->flags |= IAVF_FLAG_WB_ON_ITR_CAPABLE;

        err = iavf_request_misc_irq(adapter);
        if (err)
                goto err_sw_init;

        netif_carrier_off(netdev);
        adapter->link_up = false;

        /* set the semaphore to prevent any callbacks after device registration
         * up to time when state of driver will be set to __IAVF_DOWN
         */
        rtnl_lock();
        if (!adapter->netdev_registered) {
                err = register_netdevice(netdev);
                if (err) {
                        rtnl_unlock();
                        goto err_register;
                }
        }

        adapter->netdev_registered = true;

        netif_tx_stop_all_queues(netdev);
        if (CLIENT_ALLOWED(adapter)) {
                err = iavf_lan_add_device(adapter);
                if (err)
                        dev_info(&pdev->dev, "Failed to add VF to client API service list: %d\n",
                                 err);
        }
        dev_info(&pdev->dev, "MAC address: %pM\n", adapter->hw.mac.addr);
        if (netdev->features & NETIF_F_GRO)
                dev_info(&pdev->dev, "GRO is enabled\n");

        iavf_change_state(adapter, __IAVF_DOWN);
        set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
        rtnl_unlock();

        iavf_misc_irq_enable(adapter);
        wake_up(&adapter->down_waitqueue);

        adapter->rss_key = kzalloc(adapter->rss_key_size, GFP_KERNEL);
        adapter->rss_lut = kzalloc(adapter->rss_lut_size, GFP_KERNEL);
        if (!adapter->rss_key || !adapter->rss_lut) {
                err = -ENOMEM;
                goto err_mem;
        }
        if (RSS_AQ(adapter))
                adapter->aq_required |= IAVF_FLAG_AQ_CONFIGURE_RSS;
        else
                iavf_init_rss(adapter);

        return;
err_mem:
        iavf_free_rss(adapter);
err_register:
        iavf_free_misc_irq(adapter);
err_sw_init:
        iavf_reset_interrupt_capability(adapter);
err_alloc:
        kfree(adapter->vf_res);
        adapter->vf_res = NULL;
err:
        iavf_change_state(adapter, __IAVF_INIT_FAILED);
}

/**
 * iavf_watchdog_task - Periodic call-back task
 * @work: pointer to work_struct
 **/
static void iavf_watchdog_task(struct work_struct *work)
{
        struct iavf_adapter *adapter = container_of(work,
                                                    struct iavf_adapter,
                                                    watchdog_task.work);
        struct iavf_hw *hw = &adapter->hw;
        u32 reg_val;

        if (!mutex_trylock(&adapter->crit_lock))
                goto restart_watchdog;

        if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
                iavf_change_state(adapter, __IAVF_COMM_FAILED);

        switch (adapter->state) {
        case __IAVF_COMM_FAILED:
                reg_val = rd32(hw, IAVF_VFGEN_RSTAT) &
                          IAVF_VFGEN_RSTAT_VFR_STATE_MASK;
                if (reg_val == VIRTCHNL_VFR_VFACTIVE ||
                    reg_val == VIRTCHNL_VFR_COMPLETED) {
                        /* A chance for redemption! */
                        dev_err(&adapter->pdev->dev,
                                "Hardware came out of reset. Attempting reinit.\n");
                        iavf_change_state(adapter, __IAVF_STARTUP);
                        adapter->flags &= ~IAVF_FLAG_PF_COMMS_FAILED;
                        queue_delayed_work(iavf_wq, &adapter->init_task, 10);
                        mutex_unlock(&adapter->crit_lock);
                        /* Don't reschedule the watchdog, since we've restarted
                         * the init task. When init_task contacts the PF and
                         * gets everything set up again, it'll restart the
                         * watchdog for us. Down, boy. Sit. Stay. Woof.
                         */
                        return;
                }
                adapter->aq_required = 0;
                adapter->current_op = VIRTCHNL_OP_UNKNOWN;
                queue_delayed_work(iavf_wq,
                                   &adapter->watchdog_task,
                                   msecs_to_jiffies(10));
                goto watchdog_done;
        case __IAVF_RESETTING:
                mutex_unlock(&adapter->crit_lock);
                queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2);
                return;
        case __IAVF_DOWN:
        case __IAVF_DOWN_PENDING:
        case __IAVF_TESTING:
        case __IAVF_RUNNING:
                if (adapter->current_op) {
                        if (!iavf_asq_done(hw)) {
                                dev_dbg(&adapter->pdev->dev,
                                        "Admin queue timeout\n");
                                iavf_send_api_ver(adapter);
                        }
                } else {
                        /* An error will be returned if no commands were
                         * processed; use this opportunity to update stats
                         */
                        if (iavf_process_aq_command(adapter) &&
                            adapter->state == __IAVF_RUNNING)
                                iavf_request_stats(adapter);
                }
                break;
        case __IAVF_REMOVE:
                mutex_unlock(&adapter->crit_lock);
                return;
        default:
                goto restart_watchdog;
        }

        /* check for hw reset */
        reg_val = rd32(hw, IAVF_VF_ARQLEN1) & IAVF_VF_ARQLEN1_ARQENABLE_MASK;
        if (!reg_val) {
                iavf_change_state(adapter, __IAVF_RESETTING);
                adapter->flags |= IAVF_FLAG_RESET_PENDING;
                adapter->aq_required = 0;
                adapter->current_op = VIRTCHNL_OP_UNKNOWN;
                dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
                queue_work(iavf_wq, &adapter->reset_task);
                goto watchdog_done;
        }

        schedule_delayed_work(&adapter->client_task, msecs_to_jiffies(5));
watchdog_done:
        if (adapter->state == __IAVF_RUNNING ||
            adapter->state == __IAVF_COMM_FAILED)
                iavf_detect_recover_hung(&adapter->vsi);
        mutex_unlock(&adapter->crit_lock);
restart_watchdog:
        if (adapter->aq_required)
                queue_delayed_work(iavf_wq, &adapter->watchdog_task,
                                   msecs_to_jiffies(20));
        else
                queue_delayed_work(iavf_wq, &adapter->watchdog_task, HZ * 2);
        queue_work(iavf_wq, &adapter->adminq_task);
}

static void iavf_disable_vf(struct iavf_adapter *adapter)
{
        struct iavf_mac_filter *f, *ftmp;
        struct iavf_vlan_filter *fv, *fvtmp;
        struct iavf_cloud_filter *cf, *cftmp;

        adapter->flags |= IAVF_FLAG_PF_COMMS_FAILED;

        /* We don't use netif_running() because it may be true prior to
         * ndo_open() returning, so we can't assume it means all our open
         * tasks have finished, since we're not holding the rtnl_lock here.
         */
        if (adapter->state == __IAVF_RUNNING) {
                set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
                netif_carrier_off(adapter->netdev);
                netif_tx_disable(adapter->netdev);
                adapter->link_up = false;
                iavf_napi_disable_all(adapter);
                iavf_irq_disable(adapter);
                iavf_free_traffic_irqs(adapter);
                iavf_free_all_tx_resources(adapter);
                iavf_free_all_rx_resources(adapter);
        }

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        /* Delete all of the filters */
        list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
                list_del(&f->list);
                kfree(f);
        }

        list_for_each_entry_safe(fv, fvtmp, &adapter->vlan_filter_list, list) {
                list_del(&fv->list);
                kfree(fv);
        }

        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        spin_lock_bh(&adapter->cloud_filter_list_lock);
        list_for_each_entry_safe(cf, cftmp, &adapter->cloud_filter_list, list) {
                list_del(&cf->list);
                kfree(cf);
                adapter->num_cloud_filters--;
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);

        iavf_free_misc_irq(adapter);
        iavf_reset_interrupt_capability(adapter);
        iavf_free_q_vectors(adapter);
        iavf_free_queues(adapter);
        memset(adapter->vf_res, 0, IAVF_VIRTCHNL_VF_RESOURCE_SIZE);
        iavf_shutdown_adminq(&adapter->hw);
        adapter->netdev->flags &= ~IFF_UP;
        mutex_unlock(&adapter->crit_lock);
        adapter->flags &= ~IAVF_FLAG_RESET_PENDING;
        iavf_change_state(adapter, __IAVF_DOWN);
        wake_up(&adapter->down_waitqueue);
        dev_info(&adapter->pdev->dev, "Reset task did not complete, VF disabled\n");
}

/**
 * iavf_reset_task - Call-back task to handle hardware reset
 * @work: pointer to work_struct
 *
 * During reset we need to shut down and reinitialize the admin queue
 * before we can use it to communicate with the PF again. We also clear
 * and reinit the rings because that context is lost as well.
 **/
static void iavf_reset_task(struct work_struct *work)
{
        struct iavf_adapter *adapter = container_of(work,
                                                      struct iavf_adapter,
                                                      reset_task);
        struct virtchnl_vf_resource *vfres = adapter->vf_res;
        struct net_device *netdev = adapter->netdev;
        struct iavf_hw *hw = &adapter->hw;
        struct iavf_mac_filter *f, *ftmp;
        struct iavf_cloud_filter *cf;
        u32 reg_val;
        int i = 0, err;
        bool running;

        /* When device is being removed it doesn't make sense to run the reset
         * task, just return in such a case.
         */
        if (mutex_is_locked(&adapter->remove_lock))
                return;

        if (iavf_lock_timeout(&adapter->crit_lock, 200)) {
                schedule_work(&adapter->reset_task);
                return;
        }
        while (!mutex_trylock(&adapter->client_lock))
                usleep_range(500, 1000);
        if (CLIENT_ENABLED(adapter)) {
                adapter->flags &= ~(IAVF_FLAG_CLIENT_NEEDS_OPEN |
                                    IAVF_FLAG_CLIENT_NEEDS_CLOSE |
                                    IAVF_FLAG_CLIENT_NEEDS_L2_PARAMS |
                                    IAVF_FLAG_SERVICE_CLIENT_REQUESTED);
                cancel_delayed_work_sync(&adapter->client_task);
                iavf_notify_client_close(&adapter->vsi, true);
        }
        iavf_misc_irq_disable(adapter);
        if (adapter->flags & IAVF_FLAG_RESET_NEEDED) {
                adapter->flags &= ~IAVF_FLAG_RESET_NEEDED;
                /* Restart the AQ here. If we have been reset but didn't
                 * detect it, or if the PF had to reinit, our AQ will be hosed.
                 */
                iavf_shutdown_adminq(hw);
                iavf_init_adminq(hw);
                iavf_request_reset(adapter);
        }
        adapter->flags |= IAVF_FLAG_RESET_PENDING;

        /* poll until we see the reset actually happen */
        for (i = 0; i < IAVF_RESET_WAIT_DETECTED_COUNT; i++) {
                reg_val = rd32(hw, IAVF_VF_ARQLEN1) &
                          IAVF_VF_ARQLEN1_ARQENABLE_MASK;
                if (!reg_val)
                        break;
                usleep_range(5000, 10000);
        }
        if (i == IAVF_RESET_WAIT_DETECTED_COUNT) {
                dev_info(&adapter->pdev->dev, "Never saw reset\n");
                goto continue_reset; /* act like the reset happened */
        }

        /* wait until the reset is complete and the PF is responding to us */
        for (i = 0; i < IAVF_RESET_WAIT_COMPLETE_COUNT; i++) {
                /* sleep first to make sure a minimum wait time is met */
                msleep(IAVF_RESET_WAIT_MS);

                reg_val = rd32(hw, IAVF_VFGEN_RSTAT) &
                          IAVF_VFGEN_RSTAT_VFR_STATE_MASK;
                if (reg_val == VIRTCHNL_VFR_VFACTIVE)
                        break;
        }

        pci_set_master(adapter->pdev);
        pci_restore_msi_state(adapter->pdev);

        if (i == IAVF_RESET_WAIT_COMPLETE_COUNT) {
                dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
                        reg_val);
                iavf_disable_vf(adapter);
                mutex_unlock(&adapter->client_lock);
                mutex_unlock(&adapter->crit_lock);
                return; /* Do not attempt to reinit. It's dead, Jim. */
        }

continue_reset:
        /* We don't use netif_running() because it may be true prior to
         * ndo_open() returning, so we can't assume it means all our open
         * tasks have finished, since we're not holding the rtnl_lock here.
         */
        running = ((adapter->state == __IAVF_RUNNING) ||
                   (adapter->state == __IAVF_RESETTING));

        if (running) {
                netif_carrier_off(netdev);
                netif_tx_stop_all_queues(netdev);
                adapter->link_up = false;
                iavf_napi_disable_all(adapter);
        }
        iavf_irq_disable(adapter);

        iavf_change_state(adapter, __IAVF_RESETTING);
        adapter->flags &= ~IAVF_FLAG_RESET_PENDING;

        /* free the Tx/Rx rings and descriptors, might be better to just
         * re-use them sometime in the future
         */
        iavf_free_all_rx_resources(adapter);
        iavf_free_all_tx_resources(adapter);

        adapter->flags |= IAVF_FLAG_QUEUES_DISABLED;
        /* kill and reinit the admin queue */
        iavf_shutdown_adminq(hw);
        adapter->current_op = VIRTCHNL_OP_UNKNOWN;
        err = iavf_init_adminq(hw);
        if (err)
                dev_info(&adapter->pdev->dev, "Failed to init adminq: %d\n",
                         err);
        adapter->aq_required = 0;

        if (adapter->flags & IAVF_FLAG_REINIT_ITR_NEEDED) {
                err = iavf_reinit_interrupt_scheme(adapter);
                if (err)
                        goto reset_err;
        }

        if (RSS_AQ(adapter)) {
                adapter->aq_required |= IAVF_FLAG_AQ_CONFIGURE_RSS;
        } else {
                err = iavf_init_rss(adapter);
                if (err)
                        goto reset_err;
        }

        adapter->aq_required |= IAVF_FLAG_AQ_GET_CONFIG;
        adapter->aq_required |= IAVF_FLAG_AQ_MAP_VECTORS;

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        /* Delete filter for the current MAC address, it could have
         * been changed by the PF via administratively set MAC.
         * Will be re-added via VIRTCHNL_OP_GET_VF_RESOURCES.
         */
        list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
                if (ether_addr_equal(f->macaddr, adapter->hw.mac.addr)) {
                        list_del(&f->list);
                        kfree(f);
                }
        }
        /* re-add all MAC filters */
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                f->add = true;
        }
        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        /* check if TCs are running and re-add all cloud filters */
        spin_lock_bh(&adapter->cloud_filter_list_lock);
        if ((vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ) &&
            adapter->num_tc) {
                list_for_each_entry(cf, &adapter->cloud_filter_list, list) {
                        cf->add = true;
                }
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);

        adapter->aq_required |= IAVF_FLAG_AQ_ADD_MAC_FILTER;
        adapter->aq_required |= IAVF_FLAG_AQ_ADD_CLOUD_FILTER;
        iavf_misc_irq_enable(adapter);

        mod_delayed_work(iavf_wq, &adapter->watchdog_task, 2);

        /* We were running when the reset started, so we need to restore some
         * state here.
         */
        if (running) {
                /* allocate transmit descriptors */
                err = iavf_setup_all_tx_resources(adapter);
                if (err)
                        goto reset_err;

                /* allocate receive descriptors */
                err = iavf_setup_all_rx_resources(adapter);
                if (err)
                        goto reset_err;

                if (adapter->flags & IAVF_FLAG_REINIT_ITR_NEEDED) {
                        err = iavf_request_traffic_irqs(adapter, netdev->name);
                        if (err)
                                goto reset_err;

                        adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
                }

                iavf_configure(adapter);

                /* iavf_up_complete() will switch device back
                 * to __IAVF_RUNNING
                 */
                iavf_up_complete(adapter);

                iavf_irq_enable(adapter, true);
        } else {
                iavf_change_state(adapter, __IAVF_DOWN);
                wake_up(&adapter->down_waitqueue);
        }
        mutex_unlock(&adapter->client_lock);
        mutex_unlock(&adapter->crit_lock);

        return;
reset_err:
        mutex_unlock(&adapter->client_lock);
        mutex_unlock(&adapter->crit_lock);
        dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
        iavf_close(netdev);
}

/**
 * iavf_adminq_task - worker thread to clean the admin queue
 * @work: pointer to work_struct containing our data
 **/
static void iavf_adminq_task(struct work_struct *work)
{
        struct iavf_adapter *adapter =
                container_of(work, struct iavf_adapter, adminq_task);
        struct iavf_hw *hw = &adapter->hw;
        struct iavf_arq_event_info event;
        enum virtchnl_ops v_op;
        enum iavf_status ret, v_ret;
        u32 val, oldval;
        u16 pending;

        if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED)
                goto out;

        event.buf_len = IAVF_MAX_AQ_BUF_SIZE;
        event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
        if (!event.msg_buf)
                goto out;

        if (iavf_lock_timeout(&adapter->crit_lock, 200))
                goto freedom;
        do {
                ret = iavf_clean_arq_element(hw, &event, &pending);
                v_op = (enum virtchnl_ops)le32_to_cpu(event.desc.cookie_high);
                v_ret = (enum iavf_status)le32_to_cpu(event.desc.cookie_low);

                if (ret || !v_op)
                        break; /* No event to process or error cleaning ARQ */

                iavf_virtchnl_completion(adapter, v_op, v_ret, event.msg_buf,
                                         event.msg_len);
                if (pending != 0)
                        memset(event.msg_buf, 0, IAVF_MAX_AQ_BUF_SIZE);
        } while (pending);
        mutex_unlock(&adapter->crit_lock);

        if ((adapter->flags &
             (IAVF_FLAG_RESET_PENDING | IAVF_FLAG_RESET_NEEDED)) ||
            adapter->state == __IAVF_RESETTING)
                goto freedom;

        /* check for error indications */
        val = rd32(hw, hw->aq.arq.len);
        if (val == 0xdeadbeef || val == 0xffffffff) /* device in reset */
                goto freedom;
        oldval = val;
        if (val & IAVF_VF_ARQLEN1_ARQVFE_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ VF Error detected\n");
                val &= ~IAVF_VF_ARQLEN1_ARQVFE_MASK;
        }
        if (val & IAVF_VF_ARQLEN1_ARQOVFL_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ Overflow Error detected\n");
                val &= ~IAVF_VF_ARQLEN1_ARQOVFL_MASK;
        }
        if (val & IAVF_VF_ARQLEN1_ARQCRIT_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ Critical Error detected\n");
                val &= ~IAVF_VF_ARQLEN1_ARQCRIT_MASK;
        }
        if (oldval != val)
                wr32(hw, hw->aq.arq.len, val);

        val = rd32(hw, hw->aq.asq.len);
        oldval = val;
        if (val & IAVF_VF_ATQLEN1_ATQVFE_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ VF Error detected\n");
                val &= ~IAVF_VF_ATQLEN1_ATQVFE_MASK;
        }
        if (val & IAVF_VF_ATQLEN1_ATQOVFL_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ Overflow Error detected\n");
                val &= ~IAVF_VF_ATQLEN1_ATQOVFL_MASK;
        }
        if (val & IAVF_VF_ATQLEN1_ATQCRIT_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ Critical Error detected\n");
                val &= ~IAVF_VF_ATQLEN1_ATQCRIT_MASK;
        }
        if (oldval != val)
                wr32(hw, hw->aq.asq.len, val);

freedom:
        kfree(event.msg_buf);
out:
        /* re-enable Admin queue interrupt cause */
        iavf_misc_irq_enable(adapter);
}

/**
 * iavf_client_task - worker thread to perform client work
 * @work: pointer to work_struct containing our data
 *
 * This task handles client interactions. Because client calls can be
 * reentrant, we can't handle them in the watchdog.
 **/
static void iavf_client_task(struct work_struct *work)
{
        struct iavf_adapter *adapter =
                container_of(work, struct iavf_adapter, client_task.work);

        /* If we can't get the client bit, just give up. We'll be rescheduled
         * later.
         */

        if (!mutex_trylock(&adapter->client_lock))
                return;

        if (adapter->flags & IAVF_FLAG_SERVICE_CLIENT_REQUESTED) {
                iavf_client_subtask(adapter);
                adapter->flags &= ~IAVF_FLAG_SERVICE_CLIENT_REQUESTED;
                goto out;
        }
        if (adapter->flags & IAVF_FLAG_CLIENT_NEEDS_L2_PARAMS) {
                iavf_notify_client_l2_params(&adapter->vsi);
                adapter->flags &= ~IAVF_FLAG_CLIENT_NEEDS_L2_PARAMS;
                goto out;
        }
        if (adapter->flags & IAVF_FLAG_CLIENT_NEEDS_CLOSE) {
                iavf_notify_client_close(&adapter->vsi, false);
                adapter->flags &= ~IAVF_FLAG_CLIENT_NEEDS_CLOSE;
                goto out;
        }
        if (adapter->flags & IAVF_FLAG_CLIENT_NEEDS_OPEN) {
                iavf_notify_client_open(&adapter->vsi);
                adapter->flags &= ~IAVF_FLAG_CLIENT_NEEDS_OPEN;
        }
out:
        mutex_unlock(&adapter->client_lock);
}

/**
 * iavf_free_all_tx_resources - Free Tx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/
void iavf_free_all_tx_resources(struct iavf_adapter *adapter)
{
        int i;

        if (!adapter->tx_rings)
                return;

        for (i = 0; i < adapter->num_active_queues; i++)
                if (adapter->tx_rings[i].desc)
                        iavf_free_tx_resources(&adapter->tx_rings[i]);
}

/**
 * iavf_setup_all_tx_resources - allocate all queues Tx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int iavf_setup_all_tx_resources(struct iavf_adapter *adapter)
{
        int i, err = 0;

        for (i = 0; i < adapter->num_active_queues; i++) {
                adapter->tx_rings[i].count = adapter->tx_desc_count;
                err = iavf_setup_tx_descriptors(&adapter->tx_rings[i]);
                if (!err)
                        continue;
                dev_err(&adapter->pdev->dev,
                        "Allocation for Tx Queue %u failed\n", i);
                break;
        }

        return err;
}

/**
 * iavf_setup_all_rx_resources - allocate all queues Rx resources
 * @adapter: board private structure
 *
 * If this function returns with an error, then it's possible one or
 * more of the rings is populated (while the rest are not).  It is the
 * callers duty to clean those orphaned rings.
 *
 * Return 0 on success, negative on failure
 **/
static int iavf_setup_all_rx_resources(struct iavf_adapter *adapter)
{
        int i, err = 0;

        for (i = 0; i < adapter->num_active_queues; i++) {
                adapter->rx_rings[i].count = adapter->rx_desc_count;
                err = iavf_setup_rx_descriptors(&adapter->rx_rings[i]);
                if (!err)
                        continue;
                dev_err(&adapter->pdev->dev,
                        "Allocation for Rx Queue %u failed\n", i);
                break;
        }
        return err;
}

/**
 * iavf_free_all_rx_resources - Free Rx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/
void iavf_free_all_rx_resources(struct iavf_adapter *adapter)
{
        int i;

        if (!adapter->rx_rings)
                return;

        for (i = 0; i < adapter->num_active_queues; i++)
                if (adapter->rx_rings[i].desc)
                        iavf_free_rx_resources(&adapter->rx_rings[i]);
}

/**
 * iavf_validate_tx_bandwidth - validate the max Tx bandwidth
 * @adapter: board private structure
 * @max_tx_rate: max Tx bw for a tc
 **/
static int iavf_validate_tx_bandwidth(struct iavf_adapter *adapter,
                                      u64 max_tx_rate)
{
        int speed = 0, ret = 0;

        if (ADV_LINK_SUPPORT(adapter)) {
                if (adapter->link_speed_mbps < U32_MAX) {
                        speed = adapter->link_speed_mbps;
                        goto validate_bw;
                } else {
                        dev_err(&adapter->pdev->dev, "Unknown link speed\n");
                        return -EINVAL;
                }
        }

        switch (adapter->link_speed) {
        case VIRTCHNL_LINK_SPEED_40GB:
                speed = SPEED_40000;
                break;
        case VIRTCHNL_LINK_SPEED_25GB:
                speed = SPEED_25000;
                break;
        case VIRTCHNL_LINK_SPEED_20GB:
                speed = SPEED_20000;
                break;
        case VIRTCHNL_LINK_SPEED_10GB:
                speed = SPEED_10000;
                break;
        case VIRTCHNL_LINK_SPEED_5GB:
                speed = SPEED_5000;
                break;
        case VIRTCHNL_LINK_SPEED_2_5GB:
                speed = SPEED_2500;
                break;
        case VIRTCHNL_LINK_SPEED_1GB:
                speed = SPEED_1000;
                break;
        case VIRTCHNL_LINK_SPEED_100MB:
                speed = SPEED_100;
                break;
        default:
                break;
        }

validate_bw:
        if (max_tx_rate > speed) {
                dev_err(&adapter->pdev->dev,
                        "Invalid tx rate specified\n");
                ret = -EINVAL;
        }

        return ret;
}

/**
 * iavf_validate_ch_config - validate queue mapping info
 * @adapter: board private structure
 * @mqprio_qopt: queue parameters
 *
 * This function validates if the config provided by the user to
 * configure queue channels is valid or not. Returns 0 on a valid
 * config.
 **/
static int iavf_validate_ch_config(struct iavf_adapter *adapter,
                                   struct tc_mqprio_qopt_offload *mqprio_qopt)
{
        u64 total_max_rate = 0;
        int i, num_qps = 0;
        u64 tx_rate = 0;
        int ret = 0;

        if (mqprio_qopt->qopt.num_tc > IAVF_MAX_TRAFFIC_CLASS ||
            mqprio_qopt->qopt.num_tc < 1)
                return -EINVAL;

        for (i = 0; i <= mqprio_qopt->qopt.num_tc - 1; i++) {
                if (!mqprio_qopt->qopt.count[i] ||
                    mqprio_qopt->qopt.offset[i] != num_qps)
                        return -EINVAL;
                if (mqprio_qopt->min_rate[i]) {
                        dev_err(&adapter->pdev->dev,
                                "Invalid min tx rate (greater than 0) specified\n");
                        return -EINVAL;
                }
                /*convert to Mbps */
                tx_rate = div_u64(mqprio_qopt->max_rate[i],
                                  IAVF_MBPS_DIVISOR);
                total_max_rate += tx_rate;
                num_qps += mqprio_qopt->qopt.count[i];
        }
        if (num_qps > adapter->num_active_queues) {
                dev_err(&adapter->pdev->dev,
                        "Cannot support requested number of queues\n");
                return -EINVAL;
        }

        ret = iavf_validate_tx_bandwidth(adapter, total_max_rate);
        return ret;
}

/**
 * iavf_del_all_cloud_filters - delete all cloud filters on the traffic classes
 * @adapter: board private structure
 **/
static void iavf_del_all_cloud_filters(struct iavf_adapter *adapter)
{
        struct iavf_cloud_filter *cf, *cftmp;

        spin_lock_bh(&adapter->cloud_filter_list_lock);
        list_for_each_entry_safe(cf, cftmp, &adapter->cloud_filter_list,
                                 list) {
                list_del(&cf->list);
                kfree(cf);
                adapter->num_cloud_filters--;
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);
}

/**
 * __iavf_setup_tc - configure multiple traffic classes
 * @netdev: network interface device structure
 * @type_data: tc offload data
 *
 * This function processes the config information provided by the
 * user to configure traffic classes/queue channels and packages the
 * information to request the PF to setup traffic classes.
 *
 * Returns 0 on success.
 **/
static int __iavf_setup_tc(struct net_device *netdev, void *type_data)
{
        struct tc_mqprio_qopt_offload *mqprio_qopt = type_data;
        struct iavf_adapter *adapter = netdev_priv(netdev);
        struct virtchnl_vf_resource *vfres = adapter->vf_res;
        u8 num_tc = 0, total_qps = 0;
        int ret = 0, netdev_tc = 0;
        u64 max_tx_rate;
        u16 mode;
        int i;

        num_tc = mqprio_qopt->qopt.num_tc;
        mode = mqprio_qopt->mode;

        /* delete queue_channel */
        if (!mqprio_qopt->qopt.hw) {
                if (adapter->ch_config.state == __IAVF_TC_RUNNING) {
                        /* reset the tc configuration */
                        netdev_reset_tc(netdev);
                        adapter->num_tc = 0;
                        netif_tx_stop_all_queues(netdev);
                        netif_tx_disable(netdev);
                        iavf_del_all_cloud_filters(adapter);
                        adapter->aq_required = IAVF_FLAG_AQ_DISABLE_CHANNELS;
                        goto exit;
                } else {
                        return -EINVAL;
                }
        }

        /* add queue channel */
        if (mode == TC_MQPRIO_MODE_CHANNEL) {
                if (!(vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ)) {
                        dev_err(&adapter->pdev->dev, "ADq not supported\n");
                        return -EOPNOTSUPP;
                }
                if (adapter->ch_config.state != __IAVF_TC_INVALID) {
                        dev_err(&adapter->pdev->dev, "TC configuration already exists\n");
                        return -EINVAL;
                }

                ret = iavf_validate_ch_config(adapter, mqprio_qopt);
                if (ret)
                        return ret;
                /* Return if same TC config is requested */
                if (adapter->num_tc == num_tc)
                        return 0;
                adapter->num_tc = num_tc;

                for (i = 0; i < IAVF_MAX_TRAFFIC_CLASS; i++) {
                        if (i < num_tc) {
                                adapter->ch_config.ch_info[i].count =
                                        mqprio_qopt->qopt.count[i];
                                adapter->ch_config.ch_info[i].offset =
                                        mqprio_qopt->qopt.offset[i];
                                total_qps += mqprio_qopt->qopt.count[i];
                                max_tx_rate = mqprio_qopt->max_rate[i];
                                /* convert to Mbps */
                                max_tx_rate = div_u64(max_tx_rate,
                                                      IAVF_MBPS_DIVISOR);
                                adapter->ch_config.ch_info[i].max_tx_rate =
                                        max_tx_rate;
                        } else {
                                adapter->ch_config.ch_info[i].count = 1;
                                adapter->ch_config.ch_info[i].offset = 0;
                        }
                }
                adapter->ch_config.total_qps = total_qps;
                netif_tx_stop_all_queues(netdev);
                netif_tx_disable(netdev);
                adapter->aq_required |= IAVF_FLAG_AQ_ENABLE_CHANNELS;
                netdev_reset_tc(netdev);
                /* Report the tc mapping up the stack */
                netdev_set_num_tc(adapter->netdev, num_tc);
                for (i = 0; i < IAVF_MAX_TRAFFIC_CLASS; i++) {
                        u16 qcount = mqprio_qopt->qopt.count[i];
                        u16 qoffset = mqprio_qopt->qopt.offset[i];

                        if (i < num_tc)
                                netdev_set_tc_queue(netdev, netdev_tc++, qcount,
                                                    qoffset);
                }
        }
exit:
        return ret;
}

/**
 * iavf_parse_cls_flower - Parse tc flower filters provided by kernel
 * @adapter: board private structure
 * @f: pointer to struct flow_cls_offload
 * @filter: pointer to cloud filter structure
 */
static int iavf_parse_cls_flower(struct iavf_adapter *adapter,
                                 struct flow_cls_offload *f,
                                 struct iavf_cloud_filter *filter)
{
        struct flow_rule *rule = flow_cls_offload_flow_rule(f);
        struct flow_dissector *dissector = rule->match.dissector;
        u16 n_proto_mask = 0;
        u16 n_proto_key = 0;
        u8 field_flags = 0;
        u16 addr_type = 0;
        u16 n_proto = 0;
        int i = 0;
        struct virtchnl_filter *vf = &filter->f;

        if (dissector->used_keys &
            ~(BIT(FLOW_DISSECTOR_KEY_CONTROL) |
              BIT(FLOW_DISSECTOR_KEY_BASIC) |
              BIT(FLOW_DISSECTOR_KEY_ETH_ADDRS) |
              BIT(FLOW_DISSECTOR_KEY_VLAN) |
              BIT(FLOW_DISSECTOR_KEY_IPV4_ADDRS) |
              BIT(FLOW_DISSECTOR_KEY_IPV6_ADDRS) |
              BIT(FLOW_DISSECTOR_KEY_PORTS) |
              BIT(FLOW_DISSECTOR_KEY_ENC_KEYID))) {
                dev_err(&adapter->pdev->dev, "Unsupported key used: 0x%x\n",
                        dissector->used_keys);
                return -EOPNOTSUPP;
        }

        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_ENC_KEYID)) {
                struct flow_match_enc_keyid match;

                flow_rule_match_enc_keyid(rule, &match);
                if (match.mask->keyid != 0)
                        field_flags |= IAVF_CLOUD_FIELD_TEN_ID;
        }

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

                flow_rule_match_basic(rule, &match);
                n_proto_key = ntohs(match.key->n_proto);
                n_proto_mask = ntohs(match.mask->n_proto);

                if (n_proto_key == ETH_P_ALL) {
                        n_proto_key = 0;
                        n_proto_mask = 0;
                }
                n_proto = n_proto_key & n_proto_mask;
                if (n_proto != ETH_P_IP && n_proto != ETH_P_IPV6)
                        return -EINVAL;
                if (n_proto == ETH_P_IPV6) {
                        /* specify flow type as TCP IPv6 */
                        vf->flow_type = VIRTCHNL_TCP_V6_FLOW;
                }

                if (match.key->ip_proto != IPPROTO_TCP) {
                        dev_info(&adapter->pdev->dev, "Only TCP transport is supported\n");
                        return -EINVAL;
                }
        }

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

                flow_rule_match_eth_addrs(rule, &match);

                /* use is_broadcast and is_zero to check for all 0xf or 0 */
                if (!is_zero_ether_addr(match.mask->dst)) {
                        if (is_broadcast_ether_addr(match.mask->dst)) {
                                field_flags |= IAVF_CLOUD_FIELD_OMAC;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad ether dest mask %pM\n",
                                        match.mask->dst);
                                return IAVF_ERR_CONFIG;
                        }
                }

                if (!is_zero_ether_addr(match.mask->src)) {
                        if (is_broadcast_ether_addr(match.mask->src)) {
                                field_flags |= IAVF_CLOUD_FIELD_IMAC;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad ether src mask %pM\n",
                                        match.mask->src);
                                return IAVF_ERR_CONFIG;
                        }
                }

                if (!is_zero_ether_addr(match.key->dst))
                        if (is_valid_ether_addr(match.key->dst) ||
                            is_multicast_ether_addr(match.key->dst)) {
                                /* set the mask if a valid dst_mac address */
                                for (i = 0; i < ETH_ALEN; i++)
                                        vf->mask.tcp_spec.dst_mac[i] |= 0xff;
                                ether_addr_copy(vf->data.tcp_spec.dst_mac,
                                                match.key->dst);
                        }

                if (!is_zero_ether_addr(match.key->src))
                        if (is_valid_ether_addr(match.key->src) ||
                            is_multicast_ether_addr(match.key->src)) {
                                /* set the mask if a valid dst_mac address */
                                for (i = 0; i < ETH_ALEN; i++)
                                        vf->mask.tcp_spec.src_mac[i] |= 0xff;
                                ether_addr_copy(vf->data.tcp_spec.src_mac,
                                                match.key->src);
                }
        }

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

                flow_rule_match_vlan(rule, &match);
                if (match.mask->vlan_id) {
                        if (match.mask->vlan_id == VLAN_VID_MASK) {
                                field_flags |= IAVF_CLOUD_FIELD_IVLAN;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad vlan mask %u\n",
                                        match.mask->vlan_id);
                                return IAVF_ERR_CONFIG;
                        }
                }
                vf->mask.tcp_spec.vlan_id |= cpu_to_be16(0xffff);
                vf->data.tcp_spec.vlan_id = cpu_to_be16(match.key->vlan_id);
        }

        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_CONTROL)) {
                struct flow_match_control match;

                flow_rule_match_control(rule, &match);
                addr_type = match.key->addr_type;
        }

        if (addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) {
                struct flow_match_ipv4_addrs match;

                flow_rule_match_ipv4_addrs(rule, &match);
                if (match.mask->dst) {
                        if (match.mask->dst == cpu_to_be32(0xffffffff)) {
                                field_flags |= IAVF_CLOUD_FIELD_IIP;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad ip dst mask 0x%08x\n",
                                        be32_to_cpu(match.mask->dst));
                                return IAVF_ERR_CONFIG;
                        }
                }

                if (match.mask->src) {
                        if (match.mask->src == cpu_to_be32(0xffffffff)) {
                                field_flags |= IAVF_CLOUD_FIELD_IIP;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad ip src mask 0x%08x\n",
                                        be32_to_cpu(match.mask->dst));
                                return IAVF_ERR_CONFIG;
                        }
                }

                if (field_flags & IAVF_CLOUD_FIELD_TEN_ID) {
                        dev_info(&adapter->pdev->dev, "Tenant id not allowed for ip filter\n");
                        return IAVF_ERR_CONFIG;
                }
                if (match.key->dst) {
                        vf->mask.tcp_spec.dst_ip[0] |= cpu_to_be32(0xffffffff);
                        vf->data.tcp_spec.dst_ip[0] = match.key->dst;
                }
                if (match.key->src) {
                        vf->mask.tcp_spec.src_ip[0] |= cpu_to_be32(0xffffffff);
                        vf->data.tcp_spec.src_ip[0] = match.key->src;
                }
        }

        if (addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) {
                struct flow_match_ipv6_addrs match;

                flow_rule_match_ipv6_addrs(rule, &match);

                /* validate mask, make sure it is not IPV6_ADDR_ANY */
                if (ipv6_addr_any(&match.mask->dst)) {
                        dev_err(&adapter->pdev->dev, "Bad ipv6 dst mask 0x%02x\n",
                                IPV6_ADDR_ANY);
                        return IAVF_ERR_CONFIG;
                }

                /* src and dest IPv6 address should not be LOOPBACK
                 * (0:0:0:0:0:0:0:1) which can be represented as ::1
                 */
                if (ipv6_addr_loopback(&match.key->dst) ||
                    ipv6_addr_loopback(&match.key->src)) {
                        dev_err(&adapter->pdev->dev,
                                "ipv6 addr should not be loopback\n");
                        return IAVF_ERR_CONFIG;
                }
                if (!ipv6_addr_any(&match.mask->dst) ||
                    !ipv6_addr_any(&match.mask->src))
                        field_flags |= IAVF_CLOUD_FIELD_IIP;

                for (i = 0; i < 4; i++)
                        vf->mask.tcp_spec.dst_ip[i] |= cpu_to_be32(0xffffffff);
                memcpy(&vf->data.tcp_spec.dst_ip, &match.key->dst.s6_addr32,
                       sizeof(vf->data.tcp_spec.dst_ip));
                for (i = 0; i < 4; i++)
                        vf->mask.tcp_spec.src_ip[i] |= cpu_to_be32(0xffffffff);
                memcpy(&vf->data.tcp_spec.src_ip, &match.key->src.s6_addr32,
                       sizeof(vf->data.tcp_spec.src_ip));
        }
        if (flow_rule_match_key(rule, FLOW_DISSECTOR_KEY_PORTS)) {
                struct flow_match_ports match;

                flow_rule_match_ports(rule, &match);
                if (match.mask->src) {
                        if (match.mask->src == cpu_to_be16(0xffff)) {
                                field_flags |= IAVF_CLOUD_FIELD_IIP;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad src port mask %u\n",
                                        be16_to_cpu(match.mask->src));
                                return IAVF_ERR_CONFIG;
                        }
                }

                if (match.mask->dst) {
                        if (match.mask->dst == cpu_to_be16(0xffff)) {
                                field_flags |= IAVF_CLOUD_FIELD_IIP;
                        } else {
                                dev_err(&adapter->pdev->dev, "Bad dst port mask %u\n",
                                        be16_to_cpu(match.mask->dst));
                                return IAVF_ERR_CONFIG;
                        }
                }
                if (match.key->dst) {
                        vf->mask.tcp_spec.dst_port |= cpu_to_be16(0xffff);
                        vf->data.tcp_spec.dst_port = match.key->dst;
                }

                if (match.key->src) {
                        vf->mask.tcp_spec.src_port |= cpu_to_be16(0xffff);
                        vf->data.tcp_spec.src_port = match.key->src;
                }
        }
        vf->field_flags = field_flags;

        return 0;
}

/**
 * iavf_handle_tclass - Forward to a traffic class on the device
 * @adapter: board private structure
 * @tc: traffic class index on the device
 * @filter: pointer to cloud filter structure
 */
static int iavf_handle_tclass(struct iavf_adapter *adapter, u32 tc,
                              struct iavf_cloud_filter *filter)
{
        if (tc == 0)
                return 0;
        if (tc < adapter->num_tc) {
                if (!filter->f.data.tcp_spec.dst_port) {
                        dev_err(&adapter->pdev->dev,
                                "Specify destination port to redirect to traffic class other than TC0\n");
                        return -EINVAL;
                }
        }
        /* redirect to a traffic class on the same device */
        filter->f.action = VIRTCHNL_ACTION_TC_REDIRECT;
        filter->f.action_meta = tc;
        return 0;
}

/**
 * iavf_configure_clsflower - Add tc flower filters
 * @adapter: board private structure
 * @cls_flower: Pointer to struct flow_cls_offload
 */
static int iavf_configure_clsflower(struct iavf_adapter *adapter,
                                    struct flow_cls_offload *cls_flower)
{
        int tc = tc_classid_to_hwtc(adapter->netdev, cls_flower->classid);
        struct iavf_cloud_filter *filter = NULL;
        int err = -EINVAL, count = 50;

        if (tc < 0) {
                dev_err(&adapter->pdev->dev, "Invalid traffic class\n");
                return -EINVAL;
        }

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

        while (!mutex_trylock(&adapter->crit_lock)) {
                if (--count == 0) {
                        kfree(filter);
                        return err;
                }
                udelay(1);
        }

        filter->cookie = cls_flower->cookie;

        /* set the mask to all zeroes to begin with */
        memset(&filter->f.mask.tcp_spec, 0, sizeof(struct virtchnl_l4_spec));
        /* start out with flow type and eth type IPv4 to begin with */
        filter->f.flow_type = VIRTCHNL_TCP_V4_FLOW;
        err = iavf_parse_cls_flower(adapter, cls_flower, filter);
        if (err)
                goto err;

        err = iavf_handle_tclass(adapter, tc, filter);
        if (err)
                goto err;

        /* add filter to the list */
        spin_lock_bh(&adapter->cloud_filter_list_lock);
        list_add_tail(&filter->list, &adapter->cloud_filter_list);
        adapter->num_cloud_filters++;
        filter->add = true;
        adapter->aq_required |= IAVF_FLAG_AQ_ADD_CLOUD_FILTER;
        spin_unlock_bh(&adapter->cloud_filter_list_lock);
err:
        if (err)
                kfree(filter);

        mutex_unlock(&adapter->crit_lock);
        return err;
}

/* iavf_find_cf - Find the cloud filter in the list
 * @adapter: Board private structure
 * @cookie: filter specific cookie
 *
 * Returns ptr to the filter object or NULL. Must be called while holding the
 * cloud_filter_list_lock.
 */
static struct iavf_cloud_filter *iavf_find_cf(struct iavf_adapter *adapter,
                                              unsigned long *cookie)
{
        struct iavf_cloud_filter *filter = NULL;

        if (!cookie)
                return NULL;

        list_for_each_entry(filter, &adapter->cloud_filter_list, list) {
                if (!memcmp(cookie, &filter->cookie, sizeof(filter->cookie)))
                        return filter;
        }
        return NULL;
}

/**
 * iavf_delete_clsflower - Remove tc flower filters
 * @adapter: board private structure
 * @cls_flower: Pointer to struct flow_cls_offload
 */
static int iavf_delete_clsflower(struct iavf_adapter *adapter,
                                 struct flow_cls_offload *cls_flower)
{
        struct iavf_cloud_filter *filter = NULL;
        int err = 0;

        spin_lock_bh(&adapter->cloud_filter_list_lock);
        filter = iavf_find_cf(adapter, &cls_flower->cookie);
        if (filter) {
                filter->del = true;
                adapter->aq_required |= IAVF_FLAG_AQ_DEL_CLOUD_FILTER;
        } else {
                err = -EINVAL;
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);

        return err;
}

/**
 * iavf_setup_tc_cls_flower - flower classifier offloads
 * @adapter: board private structure
 * @cls_flower: pointer to flow_cls_offload struct with flow info
 */
static int iavf_setup_tc_cls_flower(struct iavf_adapter *adapter,
                                    struct flow_cls_offload *cls_flower)
{
        switch (cls_flower->command) {
        case FLOW_CLS_REPLACE:
                return iavf_configure_clsflower(adapter, cls_flower);
        case FLOW_CLS_DESTROY:
                return iavf_delete_clsflower(adapter, cls_flower);
        case FLOW_CLS_STATS:
                return -EOPNOTSUPP;
        default:
                return -EOPNOTSUPP;
        }
}

/**
 * iavf_setup_tc_block_cb - block callback for tc
 * @type: type of offload
 * @type_data: offload data
 * @cb_priv:
 *
 * This function is the block callback for traffic classes
 **/
static int iavf_setup_tc_block_cb(enum tc_setup_type type, void *type_data,
                                  void *cb_priv)
{
        struct iavf_adapter *adapter = cb_priv;

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

        switch (type) {
        case TC_SETUP_CLSFLOWER:
                return iavf_setup_tc_cls_flower(cb_priv, type_data);
        default:
                return -EOPNOTSUPP;
        }
}

static LIST_HEAD(iavf_block_cb_list);

/**
 * iavf_setup_tc - configure multiple traffic classes
 * @netdev: network interface device structure
 * @type: type of offload
 * @type_data: tc offload data
 *
 * This function is the callback to ndo_setup_tc in the
 * netdev_ops.
 *
 * Returns 0 on success
 **/
static int iavf_setup_tc(struct net_device *netdev, enum tc_setup_type type,
                         void *type_data)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        switch (type) {
        case TC_SETUP_QDISC_MQPRIO:
                return __iavf_setup_tc(netdev, type_data);
        case TC_SETUP_BLOCK:
                return flow_block_cb_setup_simple(type_data,
                                                  &iavf_block_cb_list,
                                                  iavf_setup_tc_block_cb,
                                                  adapter, adapter, true);
        default:
                return -EOPNOTSUPP;
        }
}

/**
 * iavf_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog is started,
 * and the stack is notified that the interface is ready.
 **/
static int iavf_open(struct net_device *netdev)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);
        int err;

        if (adapter->flags & IAVF_FLAG_PF_COMMS_FAILED) {
                dev_err(&adapter->pdev->dev, "Unable to open device due to PF driver failure.\n");
                return -EIO;
        }

        while (!mutex_trylock(&adapter->crit_lock))
                usleep_range(500, 1000);

        if (adapter->state != __IAVF_DOWN) {
                err = -EBUSY;
                goto err_unlock;
        }

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

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

        /* clear any pending interrupts, may auto mask */
        err = iavf_request_traffic_irqs(adapter, netdev->name);
        if (err)
                goto err_req_irq;

        spin_lock_bh(&adapter->mac_vlan_list_lock);

        iavf_add_filter(adapter, adapter->hw.mac.addr);

        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        /* Restore VLAN filters that were removed with IFF_DOWN */
        iavf_restore_filters(adapter);

        iavf_configure(adapter);

        iavf_up_complete(adapter);

        iavf_irq_enable(adapter, true);

        mutex_unlock(&adapter->crit_lock);

        return 0;

err_req_irq:
        iavf_down(adapter);
        iavf_free_traffic_irqs(adapter);
err_setup_rx:
        iavf_free_all_rx_resources(adapter);
err_setup_tx:
        iavf_free_all_tx_resources(adapter);
err_unlock:
        mutex_unlock(&adapter->crit_lock);

        return err;
}

/**
 * iavf_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled. All IRQs except vector 0 (reserved for admin queue)
 * are freed, along with all transmit and receive resources.
 **/
static int iavf_close(struct net_device *netdev)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);
        int status;

        if (adapter->state <= __IAVF_DOWN_PENDING)
                return 0;

        while (!mutex_trylock(&adapter->crit_lock))
                usleep_range(500, 1000);

        set_bit(__IAVF_VSI_DOWN, adapter->vsi.state);
        if (CLIENT_ENABLED(adapter))
                adapter->flags |= IAVF_FLAG_CLIENT_NEEDS_CLOSE;

        iavf_down(adapter);
        iavf_change_state(adapter, __IAVF_DOWN_PENDING);
        iavf_free_traffic_irqs(adapter);

        mutex_unlock(&adapter->crit_lock);

        /* We explicitly don't free resources here because the hardware is
         * still active and can DMA into memory. Resources are cleared in
         * iavf_virtchnl_completion() after we get confirmation from the PF
         * driver that the rings have been stopped.
         *
         * Also, we wait for state to transition to __IAVF_DOWN before
         * returning. State change occurs in iavf_virtchnl_completion() after
         * VF resources are released (which occurs after PF driver processes and
         * responds to admin queue commands).
         */

        status = wait_event_timeout(adapter->down_waitqueue,
                                    adapter->state == __IAVF_DOWN,
                                    msecs_to_jiffies(500));
        if (!status)
                netdev_warn(netdev, "Device resources not yet released\n");
        return 0;
}

/**
 * iavf_change_mtu - Change the Maximum Transfer Unit
 * @netdev: network interface device structure
 * @new_mtu: new value for maximum frame size
 *
 * Returns 0 on success, negative on failure
 **/
static int iavf_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        netdev->mtu = new_mtu;
        if (CLIENT_ENABLED(adapter)) {
                iavf_notify_client_l2_params(&adapter->vsi);
                adapter->flags |= IAVF_FLAG_SERVICE_CLIENT_REQUESTED;
        }

        if (netif_running(netdev)) {
                adapter->flags |= IAVF_FLAG_RESET_NEEDED;
                queue_work(iavf_wq, &adapter->reset_task);
        }

        return 0;
}

/**
 * iavf_set_features - set the netdev feature flags
 * @netdev: ptr to the netdev being adjusted
 * @features: the feature set that the stack is suggesting
 * Note: expects to be called while under rtnl_lock()
 **/
static int iavf_set_features(struct net_device *netdev,
                             netdev_features_t features)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        /* Don't allow enabling VLAN features when adapter is not capable
         * of VLAN offload/filtering
         */
        if (!VLAN_ALLOWED(adapter)) {
                netdev->hw_features &= ~(NETIF_F_HW_VLAN_CTAG_RX |
                                         NETIF_F_HW_VLAN_CTAG_TX |
                                         NETIF_F_HW_VLAN_CTAG_FILTER);
                if (features & (NETIF_F_HW_VLAN_CTAG_RX |
                                NETIF_F_HW_VLAN_CTAG_TX |
                                NETIF_F_HW_VLAN_CTAG_FILTER))
                        return -EINVAL;
        } else if ((netdev->features ^ features) & NETIF_F_HW_VLAN_CTAG_RX) {
                if (features & NETIF_F_HW_VLAN_CTAG_RX)
                        adapter->aq_required |=
                                IAVF_FLAG_AQ_ENABLE_VLAN_STRIPPING;
                else
                        adapter->aq_required |=
                                IAVF_FLAG_AQ_DISABLE_VLAN_STRIPPING;
        }

        return 0;
}

/**
 * iavf_features_check - Validate encapsulated packet conforms to limits
 * @skb: skb buff
 * @dev: This physical port's netdev
 * @features: Offload features that the stack believes apply
 **/
static netdev_features_t iavf_features_check(struct sk_buff *skb,
                                             struct net_device *dev,
                                             netdev_features_t features)
{
        size_t len;

        /* No point in doing any of this if neither checksum nor GSO are
         * being requested for this frame.  We can rule out both by just
         * checking for CHECKSUM_PARTIAL
         */
        if (skb->ip_summed != CHECKSUM_PARTIAL)
                return features;

        /* We cannot support GSO if the MSS is going to be less than
         * 64 bytes.  If it is then we need to drop support for GSO.
         */
        if (skb_is_gso(skb) && (skb_shinfo(skb)->gso_size < 64))
                features &= ~NETIF_F_GSO_MASK;

        /* MACLEN can support at most 63 words */
        len = skb_network_header(skb) - skb->data;
        if (len & ~(63 * 2))
                goto out_err;

        /* IPLEN and EIPLEN can support at most 127 dwords */
        len = skb_transport_header(skb) - skb_network_header(skb);
        if (len & ~(127 * 4))
                goto out_err;

        if (skb->encapsulation) {
                /* L4TUNLEN can support 127 words */
                len = skb_inner_network_header(skb) - skb_transport_header(skb);
                if (len & ~(127 * 2))
                        goto out_err;

                /* IPLEN can support at most 127 dwords */
                len = skb_inner_transport_header(skb) -
                      skb_inner_network_header(skb);
                if (len & ~(127 * 4))
                        goto out_err;
        }

        /* No need to validate L4LEN as TCP is the only protocol with a
         * a flexible value and we support all possible values supported
         * by TCP, which is at most 15 dwords
         */

        return features;
out_err:
        return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}

/**
 * iavf_fix_features - fix up the netdev feature bits
 * @netdev: our net device
 * @features: desired feature bits
 *
 * Returns fixed-up features bits
 **/
static netdev_features_t iavf_fix_features(struct net_device *netdev,
                                           netdev_features_t features)
{
        struct iavf_adapter *adapter = netdev_priv(netdev);

        if (adapter->vf_res &&
            !(adapter->vf_res->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN))
                features &= ~(NETIF_F_HW_VLAN_CTAG_TX |
                              NETIF_F_HW_VLAN_CTAG_RX |
                              NETIF_F_HW_VLAN_CTAG_FILTER);

        return features;
}

static const struct net_device_ops iavf_netdev_ops = {
        .ndo_open               = iavf_open,
        .ndo_stop               = iavf_close,
        .ndo_start_xmit         = iavf_xmit_frame,
        .ndo_set_rx_mode        = iavf_set_rx_mode,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = iavf_set_mac,
        .ndo_change_mtu         = iavf_change_mtu,
        .ndo_tx_timeout         = iavf_tx_timeout,
        .ndo_vlan_rx_add_vid    = iavf_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = iavf_vlan_rx_kill_vid,
        .ndo_features_check     = iavf_features_check,
        .ndo_fix_features       = iavf_fix_features,
        .ndo_set_features       = iavf_set_features,
        .ndo_setup_tc           = iavf_setup_tc,
};

/**
 * iavf_check_reset_complete - check that VF reset is complete
 * @hw: pointer to hw struct
 *
 * Returns 0 if device is ready to use, or -EBUSY if it's in reset.
 **/
static int iavf_check_reset_complete(struct iavf_hw *hw)
{
        u32 rstat;
        int i;

        for (i = 0; i < IAVF_RESET_WAIT_COMPLETE_COUNT; i++) {
                rstat = rd32(hw, IAVF_VFGEN_RSTAT) &
                             IAVF_VFGEN_RSTAT_VFR_STATE_MASK;
                if ((rstat == VIRTCHNL_VFR_VFACTIVE) ||
                    (rstat == VIRTCHNL_VFR_COMPLETED))
                        return 0;
                usleep_range(10, 20);
        }
        return -EBUSY;
}

/**
 * iavf_process_config - Process the config information we got from the PF
 * @adapter: board private structure
 *
 * Verify that we have a valid config struct, and set up our netdev features
 * and our VSI struct.
 **/
int iavf_process_config(struct iavf_adapter *adapter)
{
        struct virtchnl_vf_resource *vfres = adapter->vf_res;
        int i, num_req_queues = adapter->num_req_queues;
        struct net_device *netdev = adapter->netdev;
        struct iavf_vsi *vsi = &adapter->vsi;
        netdev_features_t hw_enc_features;
        netdev_features_t hw_features;

        /* got VF config message back from PF, now we can parse it */
        for (i = 0; i < vfres->num_vsis; i++) {
                if (vfres->vsi_res[i].vsi_type == VIRTCHNL_VSI_SRIOV)
                        adapter->vsi_res = &vfres->vsi_res[i];
        }
        if (!adapter->vsi_res) {
                dev_err(&adapter->pdev->dev, "No LAN VSI found\n");
                return -ENODEV;
        }

        if (num_req_queues &&
            num_req_queues > adapter->vsi_res->num_queue_pairs) {
                /* Problem.  The PF gave us fewer queues than what we had
                 * negotiated in our request.  Need a reset to see if we can't
                 * get back to a working state.
                 */
                dev_err(&adapter->pdev->dev,
                        "Requested %d queues, but PF only gave us %d.\n",
                        num_req_queues,
                        adapter->vsi_res->num_queue_pairs);
                adapter->flags |= IAVF_FLAG_REINIT_ITR_NEEDED;
                adapter->num_req_queues = adapter->vsi_res->num_queue_pairs;
                iavf_schedule_reset(adapter);
                return -ENODEV;
        }
        adapter->num_req_queues = 0;

        hw_enc_features = NETIF_F_SG                    |
                          NETIF_F_IP_CSUM               |
                          NETIF_F_IPV6_CSUM             |
                          NETIF_F_HIGHDMA               |
                          NETIF_F_SOFT_FEATURES |
                          NETIF_F_TSO                   |
                          NETIF_F_TSO_ECN               |
                          NETIF_F_TSO6                  |
                          NETIF_F_SCTP_CRC              |
                          NETIF_F_RXHASH                |
                          NETIF_F_RXCSUM                |
                          0;

        /* advertise to stack only if offloads for encapsulated packets is
         * supported
         */
        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ENCAP) {
                hw_enc_features |= NETIF_F_GSO_UDP_TUNNEL       |
                                   NETIF_F_GSO_GRE              |
                                   NETIF_F_GSO_GRE_CSUM         |
                                   NETIF_F_GSO_IPXIP4           |
                                   NETIF_F_GSO_IPXIP6           |
                                   NETIF_F_GSO_UDP_TUNNEL_CSUM  |
                                   NETIF_F_GSO_PARTIAL          |
                                   0;

                if (!(vfres->vf_cap_flags &
                      VIRTCHNL_VF_OFFLOAD_ENCAP_CSUM))
                        netdev->gso_partial_features |=
                                NETIF_F_GSO_UDP_TUNNEL_CSUM;

                netdev->gso_partial_features |= NETIF_F_GSO_GRE_CSUM;
                netdev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
                netdev->hw_enc_features |= hw_enc_features;
        }
        /* record features VLANs can make use of */
        netdev->vlan_features |= hw_enc_features | NETIF_F_TSO_MANGLEID;

        /* Write features and hw_features separately to avoid polluting
         * with, or dropping, features that are set when we registered.
         */
        hw_features = hw_enc_features;

        /* Enable VLAN features if supported */
        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN)
                hw_features |= (NETIF_F_HW_VLAN_CTAG_TX |
                                NETIF_F_HW_VLAN_CTAG_RX);
        /* Enable cloud filter if ADQ is supported */
        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_ADQ)
                hw_features |= NETIF_F_HW_TC;
        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_USO)
                hw_features |= NETIF_F_GSO_UDP_L4;

        netdev->hw_features |= hw_features;

        netdev->features |= hw_features;

        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_VLAN)
                netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;

        netdev->priv_flags |= IFF_UNICAST_FLT;

        /* Do not turn on offloads when they are requested to be turned off.
         * TSO needs minimum 576 bytes to work correctly.
         */
        if (netdev->wanted_features) {
                if (!(netdev->wanted_features & NETIF_F_TSO) ||
                    netdev->mtu < 576)
                        netdev->features &= ~NETIF_F_TSO;
                if (!(netdev->wanted_features & NETIF_F_TSO6) ||
                    netdev->mtu < 576)
                        netdev->features &= ~NETIF_F_TSO6;
                if (!(netdev->wanted_features & NETIF_F_TSO_ECN))
                        netdev->features &= ~NETIF_F_TSO_ECN;
                if (!(netdev->wanted_features & NETIF_F_GRO))
                        netdev->features &= ~NETIF_F_GRO;
                if (!(netdev->wanted_features & NETIF_F_GSO))
                        netdev->features &= ~NETIF_F_GSO;
        }

        adapter->vsi.id = adapter->vsi_res->vsi_id;

        adapter->vsi.back = adapter;
        adapter->vsi.base_vector = 1;
        adapter->vsi.work_limit = IAVF_DEFAULT_IRQ_WORK;
        vsi->netdev = adapter->netdev;
        vsi->qs_handle = adapter->vsi_res->qset_handle;
        if (vfres->vf_cap_flags & VIRTCHNL_VF_OFFLOAD_RSS_PF) {
                adapter->rss_key_size = vfres->rss_key_size;
                adapter->rss_lut_size = vfres->rss_lut_size;
        } else {
                adapter->rss_key_size = IAVF_HKEY_ARRAY_SIZE;
                adapter->rss_lut_size = IAVF_HLUT_ARRAY_SIZE;
        }

        return 0;
}

/**
 * iavf_init_task - worker thread to perform delayed initialization
 * @work: pointer to work_struct containing our data
 *
 * This task completes the work that was begun in probe. Due to the nature
 * of VF-PF communications, we may need to wait tens of milliseconds to get
 * responses back from the PF. Rather than busy-wait in probe and bog down the
 * whole system, we'll do it in a task so we can sleep.
 * This task only runs during driver init. Once we've established
 * communications with the PF driver and set up our netdev, the watchdog
 * takes over.
 **/
static void iavf_init_task(struct work_struct *work)
{
        struct iavf_adapter *adapter = container_of(work,
                                                    struct iavf_adapter,
                                                    init_task.work);
        struct iavf_hw *hw = &adapter->hw;

        if (iavf_lock_timeout(&adapter->crit_lock, 5000)) {
                dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
                return;
        }
        switch (adapter->state) {
        case __IAVF_STARTUP:
                iavf_startup(adapter);
                if (adapter->state == __IAVF_INIT_FAILED)
                        goto init_failed;
                break;
        case __IAVF_INIT_VERSION_CHECK:
                iavf_init_version_check(adapter);
                if (adapter->state == __IAVF_INIT_FAILED)
                        goto init_failed;
                break;
        case __IAVF_INIT_GET_RESOURCES:
                iavf_init_get_resources(adapter);
                if (adapter->state == __IAVF_INIT_FAILED)
                        goto init_failed;
                goto out;
        default:
                goto init_failed;
        }

        queue_delayed_work(iavf_wq, &adapter->init_task,
                           msecs_to_jiffies(30));
        goto out;
init_failed:
        if (++adapter->aq_wait_count > IAVF_AQ_MAX_ERR) {
                dev_err(&adapter->pdev->dev,
                        "Failed to communicate with PF; waiting before retry\n");
                adapter->flags |= IAVF_FLAG_PF_COMMS_FAILED;
                iavf_shutdown_adminq(hw);
                iavf_change_state(adapter, __IAVF_STARTUP);
                queue_delayed_work(iavf_wq, &adapter->init_task, HZ * 5);
                goto out;
        }
        queue_delayed_work(iavf_wq, &adapter->init_task, HZ);
out:
        mutex_unlock(&adapter->crit_lock);
}

/**
 * iavf_shutdown - Shutdown the device in preparation for a reboot
 * @pdev: pci device structure
 **/
static void iavf_shutdown(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct iavf_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (netif_running(netdev))
                iavf_close(netdev);

        if (iavf_lock_timeout(&adapter->crit_lock, 5000))
                dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);
        /* Prevent the watchdog from running. */
        iavf_change_state(adapter, __IAVF_REMOVE);
        adapter->aq_required = 0;
        mutex_unlock(&adapter->crit_lock);

#ifdef CONFIG_PM
        pci_save_state(pdev);

#endif
        pci_disable_device(pdev);
}

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

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

        err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
        if (err) {
                err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
                if (err) {
                        dev_err(&pdev->dev,
                                "DMA configuration failed: 0x%x\n", err);
                        goto err_dma;
                }
        }

        err = pci_request_regions(pdev, iavf_driver_name);
        if (err) {
                dev_err(&pdev->dev,
                        "pci_request_regions failed 0x%x\n", err);
                goto err_pci_reg;
        }

        pci_enable_pcie_error_reporting(pdev);

        pci_set_master(pdev);

        netdev = alloc_etherdev_mq(sizeof(struct iavf_adapter),
                                   IAVF_MAX_REQ_QUEUES);
        if (!netdev) {
                err = -ENOMEM;
                goto err_alloc_etherdev;
        }

        SET_NETDEV_DEV(netdev, &pdev->dev);

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

        adapter->netdev = netdev;
        adapter->pdev = pdev;

        hw = &adapter->hw;
        hw->back = adapter;

        adapter->msg_enable = BIT(DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
        iavf_change_state(adapter, __IAVF_STARTUP);

        /* Call save state here because it relies on the adapter struct. */
        pci_save_state(pdev);

        hw->hw_addr = ioremap(pci_resource_start(pdev, 0),
                              pci_resource_len(pdev, 0));
        if (!hw->hw_addr) {
                err = -EIO;
                goto err_ioremap;
        }
        hw->vendor_id = pdev->vendor;
        hw->device_id = pdev->device;
        pci_read_config_byte(pdev, PCI_REVISION_ID, &hw->revision_id);
        hw->subsystem_vendor_id = pdev->subsystem_vendor;
        hw->subsystem_device_id = pdev->subsystem_device;
        hw->bus.device = PCI_SLOT(pdev->devfn);
        hw->bus.func = PCI_FUNC(pdev->devfn);
        hw->bus.bus_id = pdev->bus->number;

        /* set up the locks for the AQ, do this only once in probe
         * and destroy them only once in remove
         */
        mutex_init(&adapter->crit_lock);
        mutex_init(&adapter->client_lock);
        mutex_init(&adapter->remove_lock);
        mutex_init(&hw->aq.asq_mutex);
        mutex_init(&hw->aq.arq_mutex);

        spin_lock_init(&adapter->mac_vlan_list_lock);
        spin_lock_init(&adapter->cloud_filter_list_lock);
        spin_lock_init(&adapter->fdir_fltr_lock);
        spin_lock_init(&adapter->adv_rss_lock);

        INIT_LIST_HEAD(&adapter->mac_filter_list);
        INIT_LIST_HEAD(&adapter->vlan_filter_list);
        INIT_LIST_HEAD(&adapter->cloud_filter_list);
        INIT_LIST_HEAD(&adapter->fdir_list_head);
        INIT_LIST_HEAD(&adapter->adv_rss_list_head);

        INIT_WORK(&adapter->reset_task, iavf_reset_task);
        INIT_WORK(&adapter->adminq_task, iavf_adminq_task);
        INIT_DELAYED_WORK(&adapter->watchdog_task, iavf_watchdog_task);
        INIT_DELAYED_WORK(&adapter->client_task, iavf_client_task);
        INIT_DELAYED_WORK(&adapter->init_task, iavf_init_task);
        queue_delayed_work(iavf_wq, &adapter->init_task,
                           msecs_to_jiffies(5 * (pdev->devfn & 0x07)));

        /* Setup the wait queue for indicating transition to down status */
        init_waitqueue_head(&adapter->down_waitqueue);

        return 0;

err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_disable_pcie_error_reporting(pdev);
        pci_release_regions(pdev);
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

/**
 * iavf_suspend - Power management suspend routine
 * @dev_d: device info pointer
 *
 * Called when the system (VM) is entering sleep/suspend.
 **/
static int __maybe_unused iavf_suspend(struct device *dev_d)
{
        struct net_device *netdev = dev_get_drvdata(dev_d);
        struct iavf_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        while (!mutex_trylock(&adapter->crit_lock))
                usleep_range(500, 1000);

        if (netif_running(netdev)) {
                rtnl_lock();
                iavf_down(adapter);
                rtnl_unlock();
        }
        iavf_free_misc_irq(adapter);
        iavf_reset_interrupt_capability(adapter);

        mutex_unlock(&adapter->crit_lock);

        return 0;
}

/**
 * iavf_resume - Power management resume routine
 * @dev_d: device info pointer
 *
 * Called when the system (VM) is resumed from sleep/suspend.
 **/
static int __maybe_unused iavf_resume(struct device *dev_d)
{
        struct pci_dev *pdev = to_pci_dev(dev_d);
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct iavf_adapter *adapter = netdev_priv(netdev);
        u32 err;

        pci_set_master(pdev);

        rtnl_lock();
        err = iavf_set_interrupt_capability(adapter);
        if (err) {
                rtnl_unlock();
                dev_err(&pdev->dev, "Cannot enable MSI-X interrupts.\n");
                return err;
        }
        err = iavf_request_misc_irq(adapter);
        rtnl_unlock();
        if (err) {
                dev_err(&pdev->dev, "Cannot get interrupt vector.\n");
                return err;
        }

        queue_work(iavf_wq, &adapter->reset_task);

        netif_device_attach(netdev);

        return err;
}

/**
 * iavf_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * iavf_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 iavf_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct iavf_adapter *adapter = netdev_priv(netdev);
        struct iavf_fdir_fltr *fdir, *fdirtmp;
        struct iavf_vlan_filter *vlf, *vlftmp;
        struct iavf_adv_rss *rss, *rsstmp;
        struct iavf_mac_filter *f, *ftmp;
        struct iavf_cloud_filter *cf, *cftmp;
        struct iavf_hw *hw = &adapter->hw;
        int err;
        /* Indicate we are in remove and not to run reset_task */
        mutex_lock(&adapter->remove_lock);
        cancel_delayed_work_sync(&adapter->init_task);
        cancel_work_sync(&adapter->reset_task);
        cancel_delayed_work_sync(&adapter->client_task);
        if (adapter->netdev_registered) {
                unregister_netdev(netdev);
                adapter->netdev_registered = false;
        }
        if (CLIENT_ALLOWED(adapter)) {
                err = iavf_lan_del_device(adapter);
                if (err)
                        dev_warn(&pdev->dev, "Failed to delete client device: %d\n",
                                 err);
        }

        iavf_request_reset(adapter);
        msleep(50);
        /* If the FW isn't responding, kick it once, but only once. */
        if (!iavf_asq_done(hw)) {
                iavf_request_reset(adapter);
                msleep(50);
        }
        if (iavf_lock_timeout(&adapter->crit_lock, 5000))
                dev_warn(&adapter->pdev->dev, "failed to acquire crit_lock in %s\n", __FUNCTION__);

        /* Shut down all the garbage mashers on the detention level */
        iavf_change_state(adapter, __IAVF_REMOVE);
        adapter->aq_required = 0;
        adapter->flags &= ~IAVF_FLAG_REINIT_ITR_NEEDED;
        iavf_free_all_tx_resources(adapter);
        iavf_free_all_rx_resources(adapter);
        iavf_misc_irq_disable(adapter);
        iavf_free_misc_irq(adapter);
        iavf_reset_interrupt_capability(adapter);
        iavf_free_q_vectors(adapter);

        cancel_delayed_work_sync(&adapter->watchdog_task);

        cancel_work_sync(&adapter->adminq_task);

        iavf_free_rss(adapter);

        if (hw->aq.asq.count)
                iavf_shutdown_adminq(hw);

        /* destroy the locks only once, here */
        mutex_destroy(&hw->aq.arq_mutex);
        mutex_destroy(&hw->aq.asq_mutex);
        mutex_destroy(&adapter->client_lock);
        mutex_unlock(&adapter->crit_lock);
        mutex_destroy(&adapter->crit_lock);
        mutex_unlock(&adapter->remove_lock);
        mutex_destroy(&adapter->remove_lock);

        iounmap(hw->hw_addr);
        pci_release_regions(pdev);
        iavf_free_queues(adapter);
        kfree(adapter->vf_res);
        spin_lock_bh(&adapter->mac_vlan_list_lock);
        /* If we got removed before an up/down sequence, we've got a filter
         * hanging out there that we need to get rid of.
         */
        list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
                list_del(&f->list);
                kfree(f);
        }
        list_for_each_entry_safe(vlf, vlftmp, &adapter->vlan_filter_list,
                                 list) {
                list_del(&vlf->list);
                kfree(vlf);
        }

        spin_unlock_bh(&adapter->mac_vlan_list_lock);

        spin_lock_bh(&adapter->cloud_filter_list_lock);
        list_for_each_entry_safe(cf, cftmp, &adapter->cloud_filter_list, list) {
                list_del(&cf->list);
                kfree(cf);
        }
        spin_unlock_bh(&adapter->cloud_filter_list_lock);

        spin_lock_bh(&adapter->fdir_fltr_lock);
        list_for_each_entry_safe(fdir, fdirtmp, &adapter->fdir_list_head, list) {
                list_del(&fdir->list);
                kfree(fdir);
        }
        spin_unlock_bh(&adapter->fdir_fltr_lock);

        spin_lock_bh(&adapter->adv_rss_lock);
        list_for_each_entry_safe(rss, rsstmp, &adapter->adv_rss_list_head,
                                 list) {
                list_del(&rss->list);
                kfree(rss);
        }
        spin_unlock_bh(&adapter->adv_rss_lock);

        free_netdev(netdev);

        pci_disable_pcie_error_reporting(pdev);

        pci_disable_device(pdev);
}

static SIMPLE_DEV_PM_OPS(iavf_pm_ops, iavf_suspend, iavf_resume);

static struct pci_driver iavf_driver = {
        .name      = iavf_driver_name,
        .id_table  = iavf_pci_tbl,
        .probe     = iavf_probe,
        .remove    = iavf_remove,
        .driver.pm = &iavf_pm_ops,
        .shutdown  = iavf_shutdown,
};

/**
 * iavf_init_module - Driver Registration Routine
 *
 * iavf_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init iavf_init_module(void)
{
        int ret;

        pr_info("iavf: %s\n", iavf_driver_string);

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

        iavf_wq = alloc_workqueue("%s", WQ_UNBOUND | WQ_MEM_RECLAIM, 1,
                                  iavf_driver_name);
        if (!iavf_wq) {
                pr_err("%s: Failed to create workqueue\n", iavf_driver_name);
                return -ENOMEM;
        }
        ret = pci_register_driver(&iavf_driver);
        return ret;
}

module_init(iavf_init_module);

/**
 * iavf_exit_module - Driver Exit Cleanup Routine
 *
 * iavf_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit iavf_exit_module(void)
{
        pci_unregister_driver(&iavf_driver);
        destroy_workqueue(iavf_wq);
}

module_exit(iavf_exit_module);

/* iavf_main.c */