Merge tag 'iio-fixes-for-4.4a' of ssh://ra.kernel.org/pub/scm/linux/kernel/git/jic23...

[mirror_ubuntu-hirsute-kernel.git] / drivers / net / ethernet / intel / i40evf / i40evf_main.c

/*******************************************************************************
 *
 * Intel Ethernet Controller XL710 Family Linux Virtual Function Driver
 * Copyright(c) 2013 - 2015 Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * The full GNU General Public License is included in this distribution in
 * the file called "COPYING".
 *
 * Contact Information:
 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 ******************************************************************************/

#include "i40evf.h"
#include "i40e_prototype.h"
static int i40evf_setup_all_tx_resources(struct i40evf_adapter *adapter);
static int i40evf_setup_all_rx_resources(struct i40evf_adapter *adapter);
static int i40evf_close(struct net_device *netdev);

char i40evf_driver_name[] = "i40evf";
static const char i40evf_driver_string[] =
        "Intel(R) XL710/X710 Virtual Function Network Driver";

#define DRV_VERSION "1.3.33"
const char i40evf_driver_version[] = DRV_VERSION;
static const char i40evf_copyright[] =
        "Copyright (c) 2013 - 2015 Intel Corporation.";

/* i40evf_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 i40evf_pci_tbl[] = {
        {PCI_VDEVICE(INTEL, I40E_DEV_ID_VF), 0},
        {PCI_VDEVICE(INTEL, I40E_DEV_ID_X722_VF), 0},
        /* required last entry */
        {0, }
};

MODULE_DEVICE_TABLE(pci, i40evf_pci_tbl);

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) XL710 X710 Virtual Function Network Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

/**
 * i40evf_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
 **/
i40e_status i40evf_allocate_dma_mem_d(struct i40e_hw *hw,
                                      struct i40e_dma_mem *mem,
                                      u64 size, u32 alignment)
{
        struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

        if (!mem)
                return I40E_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 I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_dma_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_dma_mem_d(struct i40e_hw *hw, struct i40e_dma_mem *mem)
{
        struct i40evf_adapter *adapter = (struct i40evf_adapter *)hw->back;

        if (!mem || !mem->va)
                return I40E_ERR_PARAM;
        dma_free_coherent(&adapter->pdev->dev, mem->size,
                          mem->va, (dma_addr_t)mem->pa);
        return 0;
}

/**
 * i40evf_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
 **/
i40e_status i40evf_allocate_virt_mem_d(struct i40e_hw *hw,
                                       struct i40e_virt_mem *mem, u32 size)
{
        if (!mem)
                return I40E_ERR_PARAM;

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

        if (mem->va)
                return 0;
        else
                return I40E_ERR_NO_MEMORY;
}

/**
 * i40evf_free_virt_mem_d - OS specific memory free for shared code
 * @hw:   pointer to the HW structure
 * @mem:  ptr to mem struct to free
 **/
i40e_status i40evf_free_virt_mem_d(struct i40e_hw *hw,
                                   struct i40e_virt_mem *mem)
{
        if (!mem)
                return I40E_ERR_PARAM;

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

        return 0;
}

/**
 * i40evf_debug_d - OS dependent version of debug printing
 * @hw:  pointer to the HW structure
 * @mask: debug level mask
 * @fmt_str: printf-type format description
 **/
void i40evf_debug_d(void *hw, u32 mask, char *fmt_str, ...)
{
        char buf[512];
        va_list argptr;

        if (!(mask & ((struct i40e_hw *)hw)->debug_mask))
                return;

        va_start(argptr, fmt_str);
        vsnprintf(buf, sizeof(buf), fmt_str, argptr);
        va_end(argptr);

        /* the debug string is already formatted with a newline */
        pr_info("%s", buf);
}

/**
 * i40evf_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/
static void i40evf_tx_timeout(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        adapter->tx_timeout_count++;
        if (!(adapter->flags & (I40EVF_FLAG_RESET_PENDING |
                                I40EVF_FLAG_RESET_NEEDED))) {
                adapter->flags |= I40EVF_FLAG_RESET_NEEDED;
                schedule_work(&adapter->reset_task);
        }
}

/**
 * i40evf_misc_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_disable(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;

        wr32(hw, I40E_VFINT_DYN_CTL01, 0);

        /* read flush */
        rd32(hw, I40E_VFGEN_RSTAT);

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

/**
 * i40evf_misc_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void i40evf_misc_irq_enable(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;

        wr32(hw, I40E_VFINT_DYN_CTL01, I40E_VFINT_DYN_CTL01_INTENA_MASK |
                                       I40E_VFINT_DYN_CTL01_ITR_INDX_MASK);
        wr32(hw, I40E_VFINT_ICR0_ENA1, I40E_VFINT_ICR0_ENA1_ADMINQ_MASK);

        /* read flush */
        rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void i40evf_irq_disable(struct i40evf_adapter *adapter)
{
        int i;
        struct i40e_hw *hw = &adapter->hw;

        if (!adapter->msix_entries)
                return;

        for (i = 1; i < adapter->num_msix_vectors; i++) {
                wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), 0);
                synchronize_irq(adapter->msix_entries[i].vector);
        }
        /* read flush */
        rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_irq_enable_queues - Enable interrupt for specified queues
 * @adapter: board private structure
 * @mask: bitmap of queues to enable
 **/
void i40evf_irq_enable_queues(struct i40evf_adapter *adapter, u32 mask)
{
        struct i40e_hw *hw = &adapter->hw;
        int i;

        for (i = 1; i < adapter->num_msix_vectors; i++) {
                if (mask & BIT(i - 1)) {
                        wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1),
                             I40E_VFINT_DYN_CTLN1_INTENA_MASK |
                             I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
                             I40E_VFINT_DYN_CTLN1_CLEARPBA_MASK);
                }
        }
}

/**
 * i40evf_fire_sw_int - Generate SW interrupt for specified vectors
 * @adapter: board private structure
 * @mask: bitmap of vectors to trigger
 **/
static void i40evf_fire_sw_int(struct i40evf_adapter *adapter, u32 mask)
{
        struct i40e_hw *hw = &adapter->hw;
        int i;
        uint32_t dyn_ctl;

        if (mask & 1) {
                dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTL01);
                dyn_ctl |= I40E_VFINT_DYN_CTLN1_SWINT_TRIG_MASK |
                           I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
                           I40E_VFINT_DYN_CTLN1_CLEARPBA_MASK;
                wr32(hw, I40E_VFINT_DYN_CTL01, dyn_ctl);
        }
        for (i = 1; i < adapter->num_msix_vectors; i++) {
                if (mask & BIT(i)) {
                        dyn_ctl = rd32(hw, I40E_VFINT_DYN_CTLN1(i - 1));
                        dyn_ctl |= I40E_VFINT_DYN_CTLN1_SWINT_TRIG_MASK |
                                   I40E_VFINT_DYN_CTLN1_ITR_INDX_MASK |
                                   I40E_VFINT_DYN_CTLN1_CLEARPBA_MASK;
                        wr32(hw, I40E_VFINT_DYN_CTLN1(i - 1), dyn_ctl);
                }
        }
}

/**
 * i40evf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 * @flush: boolean value whether to run rd32()
 **/
void i40evf_irq_enable(struct i40evf_adapter *adapter, bool flush)
{
        struct i40e_hw *hw = &adapter->hw;

        i40evf_misc_irq_enable(adapter);
        i40evf_irq_enable_queues(adapter, ~0);

        if (flush)
                rd32(hw, I40E_VFGEN_RSTAT);
}

/**
 * i40evf_msix_aq - Interrupt handler for vector 0
 * @irq: interrupt number
 * @data: pointer to netdev
 **/
static irqreturn_t i40evf_msix_aq(int irq, void *data)
{
        struct net_device *netdev = data;
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        struct i40e_hw *hw = &adapter->hw;
        u32 val;

        /* handle non-queue interrupts */
        rd32(hw, I40E_VFINT_ICR01);
        rd32(hw, I40E_VFINT_ICR0_ENA1);


        val = rd32(hw, I40E_VFINT_DYN_CTL01) |
              I40E_VFINT_DYN_CTL01_CLEARPBA_MASK;
        wr32(hw, I40E_VFINT_DYN_CTL01, val);

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

        return IRQ_HANDLED;
}

/**
 * i40evf_msix_clean_rings - MSIX mode Interrupt Handler
 * @irq: interrupt number
 * @data: pointer to a q_vector
 **/
static irqreturn_t i40evf_msix_clean_rings(int irq, void *data)
{
        struct i40e_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;
}

/**
 * i40evf_map_vector_to_rxq - associate irqs with rx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @r_idx: queue number
 **/
static void
i40evf_map_vector_to_rxq(struct i40evf_adapter *adapter, int v_idx, int r_idx)
{
        struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
        struct i40e_ring *rx_ring = adapter->rx_rings[r_idx];

        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.latency_range = I40E_LOW_LATENCY;
        q_vector->itr_countdown = ITR_COUNTDOWN_START;
}

/**
 * i40evf_map_vector_to_txq - associate irqs with tx queues
 * @adapter: board private structure
 * @v_idx: interrupt number
 * @t_idx: queue number
 **/
static void
i40evf_map_vector_to_txq(struct i40evf_adapter *adapter, int v_idx, int t_idx)
{
        struct i40e_q_vector *q_vector = adapter->q_vector[v_idx];
        struct i40e_ring *tx_ring = adapter->tx_rings[t_idx];

        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.latency_range = I40E_LOW_LATENCY;
        q_vector->itr_countdown = ITR_COUNTDOWN_START;
        q_vector->num_ringpairs++;
        q_vector->ring_mask |= BIT(t_idx);
}

/**
 * i40evf_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 int i40evf_map_rings_to_vectors(struct i40evf_adapter *adapter)
{
        int q_vectors;
        int v_start = 0;
        int rxr_idx = 0, txr_idx = 0;
        int rxr_remaining = adapter->num_active_queues;
        int txr_remaining = adapter->num_active_queues;
        int i, j;
        int rqpv, tqpv;
        int err = 0;

        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        /* The ideal configuration...
         * We have enough vectors to map one per queue.
         */
        if (q_vectors >= (rxr_remaining * 2)) {
                for (; rxr_idx < rxr_remaining; v_start++, rxr_idx++)
                        i40evf_map_vector_to_rxq(adapter, v_start, rxr_idx);

                for (; txr_idx < txr_remaining; v_start++, txr_idx++)
                        i40evf_map_vector_to_txq(adapter, v_start, txr_idx);
                goto out;
        }

        /* If we don't have enough vectors for a 1-to-1
         * mapping, we'll have to group them so there are
         * multiple queues per vector.
         * Re-adjusting *qpv takes care of the remainder.
         */
        for (i = v_start; i < q_vectors; i++) {
                rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors - i);
                for (j = 0; j < rqpv; j++) {
                        i40evf_map_vector_to_rxq(adapter, i, rxr_idx);
                        rxr_idx++;
                        rxr_remaining--;
                }
        }
        for (i = v_start; i < q_vectors; i++) {
                tqpv = DIV_ROUND_UP(txr_remaining, q_vectors - i);
                for (j = 0; j < tqpv; j++) {
                        i40evf_map_vector_to_txq(adapter, i, txr_idx);
                        txr_idx++;
                        txr_remaining--;
                }
        }

out:
        adapter->aq_required |= I40EVF_FLAG_AQ_MAP_VECTORS;

        return err;
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/**
 * i40evf_netpoll - A Polling 'interrupt' handler
 * @netdev: network interface device structure
 *
 * This is used by netconsole to send skbs without having to re-enable
 * interrupts.  It's not called while the normal interrupt routine is executing.
 **/
static void i40evf_netpoll(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        int q_vectors = adapter->num_msix_vectors - NONQ_VECS;
        int i;

        /* if interface is down do nothing */
        if (test_bit(__I40E_DOWN, &adapter->vsi.state))
                return;

        for (i = 0; i < q_vectors; i++)
                i40evf_msix_clean_rings(0, adapter->q_vector[i]);
}

#endif
/**
 * i40evf_request_traffic_irqs - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * Allocates MSI-X vectors for tx and rx handling, and requests
 * interrupts from the kernel.
 **/
static int
i40evf_request_traffic_irqs(struct i40evf_adapter *adapter, char *basename)
{
        int vector, err, q_vectors;
        int rx_int_idx = 0, tx_int_idx = 0;

        i40evf_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 i40e_q_vector *q_vector = adapter->q_vector[vector];

                if (q_vector->tx.ring && q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "i40evf-%s-%s-%d", basename,
                                 "TxRx", rx_int_idx++);
                        tx_int_idx++;
                } else if (q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "i40evf-%s-%s-%d", basename,
                                 "rx", rx_int_idx++);
                } else if (q_vector->tx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "i40evf-%s-%s-%d", basename,
                                 "tx", tx_int_idx++);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }
                err = request_irq(
                        adapter->msix_entries[vector + NONQ_VECS].vector,
                        i40evf_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;
                }
                /* assign the mask for this irq */
                irq_set_affinity_hint(
                        adapter->msix_entries[vector + NONQ_VECS].vector,
                        q_vector->affinity_mask);
        }

        return 0;

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

/**
 * i40evf_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 i40evf_request_misc_irq(struct i40evf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err;

        snprintf(adapter->misc_vector_name,
                 sizeof(adapter->misc_vector_name) - 1, "i40evf-%s:mbx",
                 dev_name(&adapter->pdev->dev));
        err = request_irq(adapter->msix_entries[0].vector,
                          &i40evf_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;
}

/**
 * i40evf_free_traffic_irqs - Free MSI-X interrupts
 * @adapter: board private structure
 *
 * Frees all MSI-X vectors other than 0.
 **/
static void i40evf_free_traffic_irqs(struct i40evf_adapter *adapter)
{
        int i;
        int q_vectors;

        q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (i = 0; i < q_vectors; i++) {
                irq_set_affinity_hint(adapter->msix_entries[i+1].vector,
                                      NULL);
                free_irq(adapter->msix_entries[i+1].vector,
                         adapter->q_vector[i]);
        }
}

/**
 * i40evf_free_misc_irq - Free MSI-X miscellaneous vector
 * @adapter: board private structure
 *
 * Frees MSI-X vector 0.
 **/
static void i40evf_free_misc_irq(struct i40evf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

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

/**
 * i40evf_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void i40evf_configure_tx(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;
        int i;

        for (i = 0; i < adapter->num_active_queues; i++)
                adapter->tx_rings[i]->tail = hw->hw_addr + I40E_QTX_TAIL1(i);
}

/**
 * i40evf_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void i40evf_configure_rx(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
        int i;
        int rx_buf_len;


        adapter->flags &= ~I40EVF_FLAG_RX_PS_CAPABLE;
        adapter->flags |= I40EVF_FLAG_RX_1BUF_CAPABLE;

        /* Decide whether to use packet split mode or not */
        if (netdev->mtu > ETH_DATA_LEN) {
                if (adapter->flags & I40EVF_FLAG_RX_PS_CAPABLE)
                        adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
                else
                        adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
        } else {
                if (adapter->flags & I40EVF_FLAG_RX_1BUF_CAPABLE)
                        adapter->flags &= ~I40EVF_FLAG_RX_PS_ENABLED;
                else
                        adapter->flags |= I40EVF_FLAG_RX_PS_ENABLED;
        }

        /* Set the RX buffer length according to the mode */
        if (adapter->flags & I40EVF_FLAG_RX_PS_ENABLED) {
                rx_buf_len = I40E_RX_HDR_SIZE;
        } else {
                if (netdev->mtu <= ETH_DATA_LEN)
                        rx_buf_len = I40EVF_RXBUFFER_2048;
                else
                        rx_buf_len = ALIGN(max_frame, 1024);
        }

        for (i = 0; i < adapter->num_active_queues; i++) {
                adapter->rx_rings[i]->tail = hw->hw_addr + I40E_QRX_TAIL1(i);
                adapter->rx_rings[i]->rx_buf_len = rx_buf_len;
        }
}

/**
 * i40evf_find_vlan - Search filter list for specific vlan filter
 * @adapter: board private structure
 * @vlan: vlan tag
 *
 * Returns ptr to the filter object or NULL
 **/
static struct
i40evf_vlan_filter *i40evf_find_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
        struct i40evf_vlan_filter *f;

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

/**
 * i40evf_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
i40evf_vlan_filter *i40evf_add_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
        struct i40evf_vlan_filter *f = NULL;
        int count = 50;

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section)) {
                udelay(1);
                if (--count == 0)
                        goto out;
        }

        f = i40evf_find_vlan(adapter, vlan);
        if (!f) {
                f = kzalloc(sizeof(*f), GFP_ATOMIC);
                if (!f)
                        goto clearout;

                f->vlan = vlan;

                INIT_LIST_HEAD(&f->list);
                list_add(&f->list, &adapter->vlan_filter_list);
                f->add = true;
                adapter->aq_required |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
        }

clearout:
        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
out:
        return f;
}

/**
 * i40evf_del_vlan - Remove a vlan filter from the list
 * @adapter: board private structure
 * @vlan: VLAN tag
 **/
static void i40evf_del_vlan(struct i40evf_adapter *adapter, u16 vlan)
{
        struct i40evf_vlan_filter *f;
        int count = 50;

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section)) {
                udelay(1);
                if (--count == 0)
                        return;
        }

        f = i40evf_find_vlan(adapter, vlan);
        if (f) {
                f->remove = true;
                adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
        }
        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
}

/**
 * i40evf_vlan_rx_add_vid - Add a VLAN filter to a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_add_vid(struct net_device *netdev,
                                  __always_unused __be16 proto, u16 vid)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        if (!VLAN_ALLOWED(adapter))
                return -EIO;
        if (i40evf_add_vlan(adapter, vid) == NULL)
                return -ENOMEM;
        return 0;
}

/**
 * i40evf_vlan_rx_kill_vid - Remove a VLAN filter from a device
 * @netdev: network device struct
 * @vid: VLAN tag
 **/
static int i40evf_vlan_rx_kill_vid(struct net_device *netdev,
                                   __always_unused __be16 proto, u16 vid)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        if (VLAN_ALLOWED(adapter)) {
                i40evf_del_vlan(adapter, vid);
                return 0;
        }
        return -EIO;
}

/**
 * i40evf_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
 **/
static struct
i40evf_mac_filter *i40evf_find_filter(struct i40evf_adapter *adapter,
                                      u8 *macaddr)
{
        struct i40evf_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;
}

/**
 * i40e_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.
 **/
static struct
i40evf_mac_filter *i40evf_add_filter(struct i40evf_adapter *adapter,
                                     u8 *macaddr)
{
        struct i40evf_mac_filter *f;
        int count = 50;

        if (!macaddr)
                return NULL;

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section)) {
                udelay(1);
                if (--count == 0)
                        return NULL;
        }

        f = i40evf_find_filter(adapter, macaddr);
        if (!f) {
                f = kzalloc(sizeof(*f), GFP_ATOMIC);
                if (!f) {
                        clear_bit(__I40EVF_IN_CRITICAL_TASK,
                                  &adapter->crit_section);
                        return NULL;
                }

                ether_addr_copy(f->macaddr, macaddr);

                list_add(&f->list, &adapter->mac_filter_list);
                f->add = true;
                adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
        }

        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
        return f;
}

/**
 * i40evf_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 i40evf_set_mac(struct net_device *netdev, void *p)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        struct i40e_hw *hw = &adapter->hw;
        struct i40evf_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;

        if (adapter->flags & I40EVF_FLAG_ADDR_SET_BY_PF)
                return -EPERM;

        f = i40evf_find_filter(adapter, hw->mac.addr);
        if (f) {
                f->remove = true;
                adapter->aq_required |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;
        }

        f = i40evf_add_filter(adapter, addr->sa_data);
        if (f) {
                ether_addr_copy(hw->mac.addr, addr->sa_data);
                ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
        }

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

/**
 * i40evf_set_rx_mode - NDO callback to set the netdev filters
 * @netdev: network interface device structure
 **/
static void i40evf_set_rx_mode(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        struct i40evf_mac_filter *f, *ftmp;
        struct netdev_hw_addr *uca;
        struct netdev_hw_addr *mca;
        struct netdev_hw_addr *ha;
        int count = 50;

        /* add addr if not already in the filter list */
        netdev_for_each_uc_addr(uca, netdev) {
                i40evf_add_filter(adapter, uca->addr);
        }
        netdev_for_each_mc_addr(mca, netdev) {
                i40evf_add_filter(adapter, mca->addr);
        }

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section)) {
                udelay(1);
                if (--count == 0) {
                        dev_err(&adapter->pdev->dev,
                                "Failed to get lock in %s\n", __func__);
                        return;
                }
        }
        /* remove filter if not in netdev list */
        list_for_each_entry_safe(f, ftmp, &adapter->mac_filter_list, list) {
                netdev_for_each_mc_addr(mca, netdev)
                        if (ether_addr_equal(mca->addr, f->macaddr))
                                goto bottom_of_search_loop;

                netdev_for_each_uc_addr(uca, netdev)
                        if (ether_addr_equal(uca->addr, f->macaddr))
                                goto bottom_of_search_loop;

                for_each_dev_addr(netdev, ha)
                        if (ether_addr_equal(ha->addr, f->macaddr))
                                goto bottom_of_search_loop;

                if (ether_addr_equal(f->macaddr, adapter->hw.mac.addr))
                        goto bottom_of_search_loop;

                /* f->macaddr wasn't found in uc, mc, or ha list so delete it */
                f->remove = true;
                adapter->aq_required |= I40EVF_FLAG_AQ_DEL_MAC_FILTER;

bottom_of_search_loop:
                continue;
        }
        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
}

/**
 * i40evf_napi_enable_all - enable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_enable_all(struct i40evf_adapter *adapter)
{
        int q_idx;
        struct i40e_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_vector[q_idx];
                napi = &q_vector->napi;
                napi_enable(napi);
        }
}

/**
 * i40evf_napi_disable_all - disable NAPI on all queue vectors
 * @adapter: board private structure
 **/
static void i40evf_napi_disable_all(struct i40evf_adapter *adapter)
{
        int q_idx;
        struct i40e_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_vector[q_idx];
                napi_disable(&q_vector->napi);
        }
}

/**
 * i40evf_configure - set up transmit and receive data structures
 * @adapter: board private structure
 **/
static void i40evf_configure(struct i40evf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        i40evf_set_rx_mode(netdev);

        i40evf_configure_tx(adapter);
        i40evf_configure_rx(adapter);
        adapter->aq_required |= I40EVF_FLAG_AQ_CONFIGURE_QUEUES;

        for (i = 0; i < adapter->num_active_queues; i++) {
                struct i40e_ring *ring = adapter->rx_rings[i];

                i40evf_alloc_rx_buffers_1buf(ring, ring->count);
                ring->next_to_use = ring->count - 1;
                writel(ring->next_to_use, ring->tail);
        }
}

/**
 * i40evf_up_complete - Finish the last steps of bringing up a connection
 * @adapter: board private structure
 **/
static int i40evf_up_complete(struct i40evf_adapter *adapter)
{
        adapter->state = __I40EVF_RUNNING;
        clear_bit(__I40E_DOWN, &adapter->vsi.state);

        i40evf_napi_enable_all(adapter);

        adapter->aq_required |= I40EVF_FLAG_AQ_ENABLE_QUEUES;
        mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
        return 0;
}

/**
 * i40e_down - Shutdown the connection processing
 * @adapter: board private structure
 **/
void i40evf_down(struct i40evf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct i40evf_mac_filter *f;

        if (adapter->state == __I40EVF_DOWN)
                return;

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section))
                usleep_range(500, 1000);

        netif_carrier_off(netdev);
        netif_tx_disable(netdev);
        i40evf_napi_disable_all(adapter);
        i40evf_irq_disable(adapter);

        /* 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(f, &adapter->vlan_filter_list, list) {
                f->remove = true;
        }
        if (!(adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) &&
            adapter->state != __I40EVF_RESETTING) {
                /* cancel any current operation */
                adapter->current_op = I40E_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 = I40EVF_FLAG_AQ_DEL_MAC_FILTER;
                adapter->aq_required |= I40EVF_FLAG_AQ_DEL_VLAN_FILTER;
                adapter->aq_required |= I40EVF_FLAG_AQ_DISABLE_QUEUES;
        }

        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
}

/**
 * i40evf_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
i40evf_acquire_msix_vectors(struct i40evf_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;
}

/**
 * i40evf_free_queues - Free memory for all rings
 * @adapter: board private structure to initialize
 *
 * Free all of the memory associated with queue pairs.
 **/
static void i40evf_free_queues(struct i40evf_adapter *adapter)
{
        int i;

        if (!adapter->vsi_res)
                return;
        for (i = 0; i < adapter->num_active_queues; i++) {
                if (adapter->tx_rings[i])
                        kfree_rcu(adapter->tx_rings[i], rcu);
                adapter->tx_rings[i] = NULL;
                adapter->rx_rings[i] = NULL;
        }
}

/**
 * i40evf_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 i40evf_alloc_queues(struct i40evf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_active_queues; i++) {
                struct i40e_ring *tx_ring;
                struct i40e_ring *rx_ring;

                tx_ring = kzalloc(sizeof(*tx_ring) * 2, GFP_KERNEL);
                if (!tx_ring)
                        goto err_out;

                tx_ring->queue_index = i;
                tx_ring->netdev = adapter->netdev;
                tx_ring->dev = &adapter->pdev->dev;
                tx_ring->count = adapter->tx_desc_count;
                if (adapter->flags & I40E_FLAG_WB_ON_ITR_CAPABLE)
                        tx_ring->flags |= I40E_TXR_FLAGS_WB_ON_ITR;
                adapter->tx_rings[i] = tx_ring;

                rx_ring = &tx_ring[1];
                rx_ring->queue_index = i;
                rx_ring->netdev = adapter->netdev;
                rx_ring->dev = &adapter->pdev->dev;
                rx_ring->count = adapter->rx_desc_count;
                adapter->rx_rings[i] = rx_ring;
        }

        return 0;

err_out:
        i40evf_free_queues(adapter);
        return -ENOMEM;
}

/**
 * i40evf_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 i40evf_set_interrupt_capability(struct i40evf_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 a lot more vectors
         * than CPU's.  So let's be conservative and only ask for
         * (roughly) twice the number of vectors as there are CPU's.
         */
        v_budget = min_t(int, pairs, (int)(num_online_cpus() * 2)) + NONQ_VECS;
        v_budget = min_t(int, v_budget, (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 = i40evf_acquire_msix_vectors(adapter, v_budget);

out:
        adapter->netdev->real_num_tx_queues = pairs;
        return err;
}

/**
 * i40e_configure_rss_aq - Prepare for RSS using AQ commands
 * @vsi: vsi structure
 * @seed: RSS hash seed
 **/
static void i40evf_configure_rss_aq(struct i40e_vsi *vsi, const u8 *seed)
{
        struct i40e_aqc_get_set_rss_key_data rss_key;
        struct i40evf_adapter *adapter = vsi->back;
        struct i40e_hw *hw = &adapter->hw;
        int ret = 0, i;
        u8 *rss_lut;

        if (!vsi->id)
                return;

        if (adapter->current_op != I40E_VIRTCHNL_OP_UNKNOWN) {
                /* bail because we already have a command pending */
                dev_err(&adapter->pdev->dev, "Cannot confiure RSS, command %d pending\n",
                        adapter->current_op);
                return;
        }

        memset(&rss_key, 0, sizeof(rss_key));
        memcpy(&rss_key, seed, sizeof(rss_key));

        rss_lut = kzalloc(((I40E_VFQF_HLUT_MAX_INDEX + 1) * 4), GFP_KERNEL);
        if (!rss_lut)
                return;

        /* Populate the LUT with max no. PF queues in round robin fashion */
        for (i = 0; i <= (I40E_VFQF_HLUT_MAX_INDEX * 4); i++)
                rss_lut[i] = i % adapter->num_active_queues;

        ret = i40evf_aq_set_rss_key(hw, vsi->id, &rss_key);
        if (ret) {
                dev_err(&adapter->pdev->dev,
                        "Cannot set RSS key, err %s aq_err %s\n",
                        i40evf_stat_str(hw, ret),
                        i40evf_aq_str(hw, hw->aq.asq_last_status));
                return;
        }

        ret = i40evf_aq_set_rss_lut(hw, vsi->id, false, rss_lut,
                                    (I40E_VFQF_HLUT_MAX_INDEX + 1) * 4);
        if (ret)
                dev_err(&adapter->pdev->dev,
                        "Cannot set RSS lut, err %s aq_err %s\n",
                        i40evf_stat_str(hw, ret),
                        i40evf_aq_str(hw, hw->aq.asq_last_status));
}

/**
 * i40e_configure_rss_reg - Prepare for RSS if used
 * @adapter: board private structure
 * @seed: RSS hash seed
 **/
static void i40evf_configure_rss_reg(struct i40evf_adapter *adapter,
                                     const u8 *seed)
{
        struct i40e_hw *hw = &adapter->hw;
        u32 *seed_dw = (u32 *)seed;
        u32 cqueue = 0;
        u32 lut = 0;
        int i, j;

        /* Fill out hash function seed */
        for (i = 0; i <= I40E_VFQF_HKEY_MAX_INDEX; i++)
                wr32(hw, I40E_VFQF_HKEY(i), seed_dw[i]);

        /* Populate the LUT with max no. PF queues in round robin fashion */
        for (i = 0; i <= I40E_VFQF_HLUT_MAX_INDEX; i++) {
                lut = 0;
                for (j = 0; j < 4; j++) {
                        if (cqueue == adapter->num_active_queues)
                                cqueue = 0;
                        lut |= ((cqueue) << (8 * j));
                        cqueue++;
                }
                wr32(hw, I40E_VFQF_HLUT(i), lut);
        }
        i40e_flush(hw);
}

/**
 * i40evf_configure_rss - Prepare for RSS
 * @adapter: board private structure
 **/
static void i40evf_configure_rss(struct i40evf_adapter *adapter)
{
        struct i40e_hw *hw = &adapter->hw;
        u8 seed[I40EVF_HKEY_ARRAY_SIZE];
        u64 hena;

        netdev_rss_key_fill((void *)seed, I40EVF_HKEY_ARRAY_SIZE);

        /* Enable PCTYPES for RSS, TCP/UDP with IPv4/IPv6 */
        hena = I40E_DEFAULT_RSS_HENA;
        wr32(hw, I40E_VFQF_HENA(0), (u32)hena);
        wr32(hw, I40E_VFQF_HENA(1), (u32)(hena >> 32));

        if (RSS_AQ(adapter))
                i40evf_configure_rss_aq(&adapter->vsi, seed);
        else
                i40evf_configure_rss_reg(adapter, seed);
}

/**
 * i40evf_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 i40evf_alloc_q_vectors(struct i40evf_adapter *adapter)
{
        int q_idx, num_q_vectors;
        struct i40e_q_vector *q_vector;

        num_q_vectors = adapter->num_msix_vectors - NONQ_VECS;

        for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
                q_vector = kzalloc(sizeof(*q_vector), GFP_KERNEL);
                if (!q_vector)
                        goto err_out;
                q_vector->adapter = adapter;
                q_vector->vsi = &adapter->vsi;
                q_vector->v_idx = q_idx;
                netif_napi_add(adapter->netdev, &q_vector->napi,
                               i40evf_napi_poll, NAPI_POLL_WEIGHT);
                adapter->q_vector[q_idx] = q_vector;
        }

        return 0;

err_out:
        while (q_idx) {
                q_idx--;
                q_vector = adapter->q_vector[q_idx];
                netif_napi_del(&q_vector->napi);
                kfree(q_vector);
                adapter->q_vector[q_idx] = NULL;
        }
        return -ENOMEM;
}

/**
 * i40evf_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 i40evf_free_q_vectors(struct i40evf_adapter *adapter)
{
        int q_idx, num_q_vectors;
        int napi_vectors;

        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 i40e_q_vector *q_vector = adapter->q_vector[q_idx];

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

/**
 * i40evf_reset_interrupt_capability - Reset MSIX setup
 * @adapter: board private structure
 *
 **/
void i40evf_reset_interrupt_capability(struct i40evf_adapter *adapter)
{
        pci_disable_msix(adapter->pdev);
        kfree(adapter->msix_entries);
        adapter->msix_entries = NULL;
}

/**
 * i40evf_init_interrupt_scheme - Determine if MSIX is supported and init
 * @adapter: board private structure to initialize
 *
 **/
int i40evf_init_interrupt_scheme(struct i40evf_adapter *adapter)
{
        int err;

        err = i40evf_set_interrupt_capability(adapter);
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "Unable to setup interrupt capabilities\n");
                goto err_set_interrupt;
        }

        err = i40evf_alloc_q_vectors(adapter);
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "Unable to allocate memory for queue vectors\n");
                goto err_alloc_q_vectors;
        }

        err = i40evf_alloc_queues(adapter);
        if (err) {
                dev_err(&adapter->pdev->dev,
                        "Unable to allocate memory for queues\n");
                goto err_alloc_queues;
        }

        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_queues:
        i40evf_free_q_vectors(adapter);
err_alloc_q_vectors:
        i40evf_reset_interrupt_capability(adapter);
err_set_interrupt:
        return err;
}

/**
 * i40evf_watchdog_timer - Periodic call-back timer
 * @data: pointer to adapter disguised as unsigned long
 **/
static void i40evf_watchdog_timer(unsigned long data)
{
        struct i40evf_adapter *adapter = (struct i40evf_adapter *)data;

        schedule_work(&adapter->watchdog_task);
        /* timer will be rescheduled in watchdog task */
}

/**
 * i40evf_watchdog_task - Periodic call-back task
 * @work: pointer to work_struct
 **/
static void i40evf_watchdog_task(struct work_struct *work)
{
        struct i40evf_adapter *adapter = container_of(work,
                                                      struct i40evf_adapter,
                                                      watchdog_task);
        struct i40e_hw *hw = &adapter->hw;
        u32 reg_val;

        if (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section))
                goto restart_watchdog;

        if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
                reg_val = rd32(hw, I40E_VFGEN_RSTAT) &
                          I40E_VFGEN_RSTAT_VFR_STATE_MASK;
                if ((reg_val == I40E_VFR_VFACTIVE) ||
                    (reg_val == I40E_VFR_COMPLETED)) {
                        /* A chance for redemption! */
                        dev_err(&adapter->pdev->dev, "Hardware came out of reset. Attempting reinit.\n");
                        adapter->state = __I40EVF_STARTUP;
                        adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
                        schedule_delayed_work(&adapter->init_task, 10);
                        clear_bit(__I40EVF_IN_CRITICAL_TASK,
                                  &adapter->crit_section);
                        /* 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 = I40E_VIRTCHNL_OP_UNKNOWN;
                goto watchdog_done;
        }

        if ((adapter->state < __I40EVF_DOWN) ||
            (adapter->flags & I40EVF_FLAG_RESET_PENDING))
                goto watchdog_done;

        /* check for reset */
        reg_val = rd32(hw, I40E_VF_ARQLEN1) & I40E_VF_ARQLEN1_ARQENABLE_MASK;
        if (!(adapter->flags & I40EVF_FLAG_RESET_PENDING) && !reg_val) {
                adapter->state = __I40EVF_RESETTING;
                adapter->flags |= I40EVF_FLAG_RESET_PENDING;
                dev_err(&adapter->pdev->dev, "Hardware reset detected\n");
                schedule_work(&adapter->reset_task);
                adapter->aq_required = 0;
                adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
                goto watchdog_done;
        }

        /* Process admin queue tasks. After init, everything gets done
         * here so we don't race on the admin queue.
         */
        if (adapter->current_op) {
                if (!i40evf_asq_done(hw)) {
                        dev_dbg(&adapter->pdev->dev, "Admin queue timeout\n");
                        i40evf_send_api_ver(adapter);
                }
                goto watchdog_done;
        }
        if (adapter->aq_required & I40EVF_FLAG_AQ_GET_CONFIG) {
                i40evf_send_vf_config_msg(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_DISABLE_QUEUES) {
                i40evf_disable_queues(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_MAP_VECTORS) {
                i40evf_map_queues(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_MAC_FILTER) {
                i40evf_add_ether_addrs(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_ADD_VLAN_FILTER) {
                i40evf_add_vlans(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_MAC_FILTER) {
                i40evf_del_ether_addrs(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_DEL_VLAN_FILTER) {
                i40evf_del_vlans(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_CONFIGURE_QUEUES) {
                i40evf_configure_queues(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_FLAG_AQ_ENABLE_QUEUES) {
                i40evf_enable_queues(adapter);
                goto watchdog_done;
        }

        if (adapter->aq_required & I40EVF_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.
                 */
                i40evf_configure_rss(adapter);
                adapter->aq_required &= ~I40EVF_FLAG_AQ_CONFIGURE_RSS;
                goto watchdog_done;
        }

        if (adapter->state == __I40EVF_RUNNING)
                i40evf_request_stats(adapter);
watchdog_done:
        if (adapter->state == __I40EVF_RUNNING) {
                i40evf_irq_enable_queues(adapter, ~0);
                i40evf_fire_sw_int(adapter, 0xFF);
        } else {
                i40evf_fire_sw_int(adapter, 0x1);
        }

        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
restart_watchdog:
        if (adapter->state == __I40EVF_REMOVE)
                return;
        if (adapter->aq_required)
                mod_timer(&adapter->watchdog_timer,
                          jiffies + msecs_to_jiffies(20));
        else
                mod_timer(&adapter->watchdog_timer, jiffies + (HZ * 2));
        schedule_work(&adapter->adminq_task);
}

#define I40EVF_RESET_WAIT_MS 10
#define I40EVF_RESET_WAIT_COUNT 500
/**
 * i40evf_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 i40evf_reset_task(struct work_struct *work)
{
        struct i40evf_adapter *adapter = container_of(work,
                                                      struct i40evf_adapter,
                                                      reset_task);
        struct net_device *netdev = adapter->netdev;
        struct i40e_hw *hw = &adapter->hw;
        struct i40evf_vlan_filter *vlf;
        struct i40evf_mac_filter *f;
        u32 reg_val;
        int i = 0, err;

        while (test_and_set_bit(__I40EVF_IN_CRITICAL_TASK,
                                &adapter->crit_section))
                usleep_range(500, 1000);

        i40evf_misc_irq_disable(adapter);
        if (adapter->flags & I40EVF_FLAG_RESET_NEEDED) {
                adapter->flags &= ~I40EVF_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.
                 */
                i40evf_shutdown_adminq(hw);
                i40evf_init_adminq(hw);
                i40evf_request_reset(adapter);
        }
        adapter->flags |= I40EVF_FLAG_RESET_PENDING;

        /* poll until we see the reset actually happen */
        for (i = 0; i < I40EVF_RESET_WAIT_COUNT; i++) {
                reg_val = rd32(hw, I40E_VF_ARQLEN1) &
                          I40E_VF_ARQLEN1_ARQENABLE_MASK;
                if (!reg_val)
                        break;
                usleep_range(5000, 10000);
        }
        if (i == I40EVF_RESET_WAIT_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 < I40EVF_RESET_WAIT_COUNT; i++) {
                reg_val = rd32(hw, I40E_VFGEN_RSTAT) &
                          I40E_VFGEN_RSTAT_VFR_STATE_MASK;
                if (reg_val == I40E_VFR_VFACTIVE)
                        break;
                msleep(I40EVF_RESET_WAIT_MS);
        }
        /* extra wait to make sure minimum wait is met */
        msleep(I40EVF_RESET_WAIT_MS);
        if (i == I40EVF_RESET_WAIT_COUNT) {
                struct i40evf_mac_filter *ftmp;
                struct i40evf_vlan_filter *fv, *fvtmp;

                /* reset never finished */
                dev_err(&adapter->pdev->dev, "Reset never finished (%x)\n",
                        reg_val);
                adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;

                if (netif_running(adapter->netdev)) {
                        set_bit(__I40E_DOWN, &adapter->vsi.state);
                        netif_carrier_off(netdev);
                        netif_tx_disable(netdev);
                        i40evf_napi_disable_all(adapter);
                        i40evf_irq_disable(adapter);
                        i40evf_free_traffic_irqs(adapter);
                        i40evf_free_all_tx_resources(adapter);
                        i40evf_free_all_rx_resources(adapter);
                }

                /* Delete all of the filters, both MAC and VLAN. */
                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);
                }

                i40evf_free_misc_irq(adapter);
                i40evf_reset_interrupt_capability(adapter);
                i40evf_free_queues(adapter);
                i40evf_free_q_vectors(adapter);
                kfree(adapter->vf_res);
                i40evf_shutdown_adminq(hw);
                adapter->netdev->flags &= ~IFF_UP;
                clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
                adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
                dev_info(&adapter->pdev->dev, "Reset task did not complete, VF disabled\n");
                return; /* Do not attempt to reinit. It's dead, Jim. */
        }

continue_reset:
        if (netif_running(adapter->netdev)) {
                netif_carrier_off(netdev);
                netif_tx_stop_all_queues(netdev);
                i40evf_napi_disable_all(adapter);
        }
        i40evf_irq_disable(adapter);

        adapter->state = __I40EVF_RESETTING;
        adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;

        /* free the Tx/Rx rings and descriptors, might be better to just
         * re-use them sometime in the future
         */
        i40evf_free_all_rx_resources(adapter);
        i40evf_free_all_tx_resources(adapter);

        /* kill and reinit the admin queue */
        if (i40evf_shutdown_adminq(hw))
                dev_warn(&adapter->pdev->dev, "Failed to shut down adminq\n");
        adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;
        err = i40evf_init_adminq(hw);
        if (err)
                dev_info(&adapter->pdev->dev, "Failed to init adminq: %d\n",
                         err);

        adapter->aq_required = I40EVF_FLAG_AQ_GET_CONFIG;
        adapter->aq_required |= I40EVF_FLAG_AQ_MAP_VECTORS;

        /* re-add all MAC filters */
        list_for_each_entry(f, &adapter->mac_filter_list, list) {
                f->add = true;
        }
        /* re-add all VLAN filters */
        list_for_each_entry(vlf, &adapter->vlan_filter_list, list) {
                vlf->add = true;
        }
        adapter->aq_required |= I40EVF_FLAG_AQ_ADD_MAC_FILTER;
        adapter->aq_required |= I40EVF_FLAG_AQ_ADD_VLAN_FILTER;
        clear_bit(__I40EVF_IN_CRITICAL_TASK, &adapter->crit_section);
        i40evf_misc_irq_enable(adapter);

        mod_timer(&adapter->watchdog_timer, jiffies + 2);

        if (netif_running(adapter->netdev)) {
                /* allocate transmit descriptors */
                err = i40evf_setup_all_tx_resources(adapter);
                if (err)
                        goto reset_err;

                /* allocate receive descriptors */
                err = i40evf_setup_all_rx_resources(adapter);
                if (err)
                        goto reset_err;

                i40evf_configure(adapter);

                err = i40evf_up_complete(adapter);
                if (err)
                        goto reset_err;

                i40evf_irq_enable(adapter, true);
        } else {
                adapter->state = __I40EVF_DOWN;
        }

        return;
reset_err:
        dev_err(&adapter->pdev->dev, "failed to allocate resources during reinit\n");
        i40evf_close(adapter->netdev);
}

/**
 * i40evf_adminq_task - worker thread to clean the admin queue
 * @work: pointer to work_struct containing our data
 **/
static void i40evf_adminq_task(struct work_struct *work)
{
        struct i40evf_adapter *adapter =
                container_of(work, struct i40evf_adapter, adminq_task);
        struct i40e_hw *hw = &adapter->hw;
        struct i40e_arq_event_info event;
        struct i40e_virtchnl_msg *v_msg;
        i40e_status ret;
        u32 val, oldval;
        u16 pending;

        if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED)
                goto out;

        event.buf_len = I40EVF_MAX_AQ_BUF_SIZE;
        event.msg_buf = kzalloc(event.buf_len, GFP_KERNEL);
        if (!event.msg_buf)
                goto out;

        v_msg = (struct i40e_virtchnl_msg *)&event.desc;
        do {
                ret = i40evf_clean_arq_element(hw, &event, &pending);
                if (ret || !v_msg->v_opcode)
                        break; /* No event to process or error cleaning ARQ */

                i40evf_virtchnl_completion(adapter, v_msg->v_opcode,
                                           v_msg->v_retval, event.msg_buf,
                                           event.msg_len);
                if (pending != 0)
                        memset(event.msg_buf, 0, I40EVF_MAX_AQ_BUF_SIZE);
        } while (pending);

        if ((adapter->flags &
             (I40EVF_FLAG_RESET_PENDING | I40EVF_FLAG_RESET_NEEDED)) ||
            adapter->state == __I40EVF_RESETTING)
                goto freedom;

        /* check for error indications */
        val = rd32(hw, hw->aq.arq.len);
        oldval = val;
        if (val & I40E_VF_ARQLEN1_ARQVFE_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ VF Error detected\n");
                val &= ~I40E_VF_ARQLEN1_ARQVFE_MASK;
        }
        if (val & I40E_VF_ARQLEN1_ARQOVFL_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ Overflow Error detected\n");
                val &= ~I40E_VF_ARQLEN1_ARQOVFL_MASK;
        }
        if (val & I40E_VF_ARQLEN1_ARQCRIT_MASK) {
                dev_info(&adapter->pdev->dev, "ARQ Critical Error detected\n");
                val &= ~I40E_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 & I40E_VF_ATQLEN1_ATQVFE_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ VF Error detected\n");
                val &= ~I40E_VF_ATQLEN1_ATQVFE_MASK;
        }
        if (val & I40E_VF_ATQLEN1_ATQOVFL_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ Overflow Error detected\n");
                val &= ~I40E_VF_ATQLEN1_ATQOVFL_MASK;
        }
        if (val & I40E_VF_ATQLEN1_ATQCRIT_MASK) {
                dev_info(&adapter->pdev->dev, "ASQ Critical Error detected\n");
                val &= ~I40E_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 */
        i40evf_misc_irq_enable(adapter);
}

/**
 * i40evf_free_all_tx_resources - Free Tx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all transmit software resources
 **/
void i40evf_free_all_tx_resources(struct i40evf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_active_queues; i++)
                if (adapter->tx_rings[i]->desc)
                        i40evf_free_tx_resources(adapter->tx_rings[i]);
}

/**
 * i40evf_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 i40evf_setup_all_tx_resources(struct i40evf_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 = i40evf_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;
}

/**
 * i40evf_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 i40evf_setup_all_rx_resources(struct i40evf_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 = i40evf_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;
}

/**
 * i40evf_free_all_rx_resources - Free Rx Resources for All Queues
 * @adapter: board private structure
 *
 * Free all receive software resources
 **/
void i40evf_free_all_rx_resources(struct i40evf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_active_queues; i++)
                if (adapter->rx_rings[i]->desc)
                        i40evf_free_rx_resources(adapter->rx_rings[i]);
}

/**
 * i40evf_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/
static int i40evf_open(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        int err;

        if (adapter->flags & I40EVF_FLAG_PF_COMMS_FAILED) {
                dev_err(&adapter->pdev->dev, "Unable to open device due to PF driver failure.\n");
                return -EIO;
        }
        if (adapter->state != __I40EVF_DOWN || adapter->aq_required)
                return -EBUSY;

        /* allocate transmit descriptors */
        err = i40evf_setup_all_tx_resources(adapter);
        if (err)
                goto err_setup_tx;

        /* allocate receive descriptors */
        err = i40evf_setup_all_rx_resources(adapter);
        if (err)
                goto err_setup_rx;

        /* clear any pending interrupts, may auto mask */
        err = i40evf_request_traffic_irqs(adapter, netdev->name);
        if (err)
                goto err_req_irq;

        i40evf_add_filter(adapter, adapter->hw.mac.addr);
        i40evf_configure(adapter);

        err = i40evf_up_complete(adapter);
        if (err)
                goto err_req_irq;

        i40evf_irq_enable(adapter, true);

        return 0;

err_req_irq:
        i40evf_down(adapter);
        i40evf_free_traffic_irqs(adapter);
err_setup_rx:
        i40evf_free_all_rx_resources(adapter);
err_setup_tx:
        i40evf_free_all_tx_resources(adapter);

        return err;
}

/**
 * i40evf_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 i40evf_close(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        if (adapter->state <= __I40EVF_DOWN)
                return 0;


        set_bit(__I40E_DOWN, &adapter->vsi.state);

        i40evf_down(adapter);
        adapter->state = __I40EVF_DOWN;
        i40evf_free_traffic_irqs(adapter);

        return 0;
}

/**
 * i40evf_get_stats - Get System Network Statistics
 * @netdev: network interface device structure
 *
 * Returns the address of the device statistics structure.
 * The statistics are actually updated from the timer callback.
 **/
static struct net_device_stats *i40evf_get_stats(struct net_device *netdev)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        /* only return the current stats */
        return &adapter->net_stats;
}

/**
 * i40evf_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 i40evf_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;

        if ((new_mtu < 68) || (max_frame > I40E_MAX_RXBUFFER))
                return -EINVAL;

        netdev->mtu = new_mtu;
        adapter->flags |= I40EVF_FLAG_RESET_NEEDED;
        schedule_work(&adapter->reset_task);

        return 0;
}

static const struct net_device_ops i40evf_netdev_ops = {
        .ndo_open               = i40evf_open,
        .ndo_stop               = i40evf_close,
        .ndo_start_xmit         = i40evf_xmit_frame,
        .ndo_get_stats          = i40evf_get_stats,
        .ndo_set_rx_mode        = i40evf_set_rx_mode,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = i40evf_set_mac,
        .ndo_change_mtu         = i40evf_change_mtu,
        .ndo_tx_timeout         = i40evf_tx_timeout,
        .ndo_vlan_rx_add_vid    = i40evf_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = i40evf_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = i40evf_netpoll,
#endif
};

/**
 * i40evf_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 i40evf_check_reset_complete(struct i40e_hw *hw)
{
        u32 rstat;
        int i;

        for (i = 0; i < 100; i++) {
                rstat = rd32(hw, I40E_VFGEN_RSTAT) &
                            I40E_VFGEN_RSTAT_VFR_STATE_MASK;
                if ((rstat == I40E_VFR_VFACTIVE) ||
                    (rstat == I40E_VFR_COMPLETED))
                        return 0;
                usleep_range(10, 20);
        }
        return -EBUSY;
}

/**
 * i40evf_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 i40evf_process_config(struct i40evf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        /* got VF config message back from PF, now we can parse it */
        for (i = 0; i < adapter->vf_res->num_vsis; i++) {
                if (adapter->vf_res->vsi_res[i].vsi_type == I40E_VSI_SRIOV)
                        adapter->vsi_res = &adapter->vf_res->vsi_res[i];
        }
        if (!adapter->vsi_res) {
                dev_err(&adapter->pdev->dev, "No LAN VSI found\n");
                return -ENODEV;
        }

        if (adapter->vf_res->vf_offload_flags
            & I40E_VIRTCHNL_VF_OFFLOAD_VLAN) {
                netdev->vlan_features = netdev->features &
                                        ~(NETIF_F_HW_VLAN_CTAG_TX |
                                          NETIF_F_HW_VLAN_CTAG_RX |
                                          NETIF_F_HW_VLAN_CTAG_FILTER);
                netdev->features |= NETIF_F_HW_VLAN_CTAG_TX |
                                    NETIF_F_HW_VLAN_CTAG_RX |
                                    NETIF_F_HW_VLAN_CTAG_FILTER;
        }
        netdev->features |= NETIF_F_HIGHDMA |
                            NETIF_F_SG |
                            NETIF_F_IP_CSUM |
                            NETIF_F_SCTP_CSUM |
                            NETIF_F_IPV6_CSUM |
                            NETIF_F_TSO |
                            NETIF_F_TSO6 |
                            NETIF_F_RXCSUM |
                            NETIF_F_GRO;

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

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

        adapter->vsi.back = adapter;
        adapter->vsi.base_vector = 1;
        adapter->vsi.work_limit = I40E_DEFAULT_IRQ_WORK;
        adapter->vsi.rx_itr_setting = (I40E_ITR_DYNAMIC |
                                       ITR_REG_TO_USEC(I40E_ITR_RX_DEF));
        adapter->vsi.tx_itr_setting = (I40E_ITR_DYNAMIC |
                                       ITR_REG_TO_USEC(I40E_ITR_TX_DEF));
        adapter->vsi.netdev = adapter->netdev;
        adapter->vsi.qs_handle = adapter->vsi_res->qset_handle;
        return 0;
}

/**
 * i40evf_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 i40evf_init_task(struct work_struct *work)
{
        struct i40evf_adapter *adapter = container_of(work,
                                                      struct i40evf_adapter,
                                                      init_task.work);
        struct net_device *netdev = adapter->netdev;
        struct i40e_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        int err, bufsz;

        switch (adapter->state) {
        case __I40EVF_STARTUP:
                /* driver loaded, probe complete */
                adapter->flags &= ~I40EVF_FLAG_PF_COMMS_FAILED;
                adapter->flags &= ~I40EVF_FLAG_RESET_PENDING;
                err = i40e_set_mac_type(hw);
                if (err) {
                        dev_err(&pdev->dev, "Failed to set MAC type (%d)\n",
                                err);
                        goto err;
                }
                err = i40evf_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 = I40EVF_AQ_LEN;
                hw->aq.num_asq_entries = I40EVF_AQ_LEN;
                hw->aq.arq_buf_size = I40EVF_MAX_AQ_BUF_SIZE;
                hw->aq.asq_buf_size = I40EVF_MAX_AQ_BUF_SIZE;

                err = i40evf_init_adminq(hw);
                if (err) {
                        dev_err(&pdev->dev, "Failed to init Admin Queue (%d)\n",
                                err);
                        goto err;
                }
                err = i40evf_send_api_ver(adapter);
                if (err) {
                        dev_err(&pdev->dev, "Unable to send to PF (%d)\n", err);
                        i40evf_shutdown_adminq(hw);
                        goto err;
                }
                adapter->state = __I40EVF_INIT_VERSION_CHECK;
                goto restart;
        case __I40EVF_INIT_VERSION_CHECK:
                if (!i40evf_asq_done(hw)) {
                        dev_err(&pdev->dev, "Admin queue command never completed\n");
                        i40evf_shutdown_adminq(hw);
                        adapter->state = __I40EVF_STARTUP;
                        goto err;
                }

                /* aq msg sent, awaiting reply */
                err = i40evf_verify_api_ver(adapter);
                if (err) {
                        if (err == I40E_ERR_ADMIN_QUEUE_NO_WORK)
                                err = i40evf_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,
                                        I40E_VIRTCHNL_VERSION_MAJOR,
                                        I40E_VIRTCHNL_VERSION_MINOR);
                        goto err;
                }
                err = i40evf_send_vf_config_msg(adapter);
                if (err) {
                        dev_err(&pdev->dev, "Unable to send config request (%d)\n",
                                err);
                        goto err;
                }
                adapter->state = __I40EVF_INIT_GET_RESOURCES;
                goto restart;
        case __I40EVF_INIT_GET_RESOURCES:
                /* aq msg sent, awaiting reply */
                if (!adapter->vf_res) {
                        bufsz = sizeof(struct i40e_virtchnl_vf_resource) +
                                (I40E_MAX_VF_VSI *
                                 sizeof(struct i40e_virtchnl_vsi_resource));
                        adapter->vf_res = kzalloc(bufsz, GFP_KERNEL);
                        if (!adapter->vf_res)
                                goto err;
                }
                err = i40evf_get_vf_config(adapter);
                if (err == I40E_ERR_ADMIN_QUEUE_NO_WORK) {
                        err = i40evf_send_vf_config_msg(adapter);
                        goto err;
                }
                if (err) {
                        dev_err(&pdev->dev, "Unable to get VF config (%d)\n",
                                err);
                        goto err_alloc;
                }
                adapter->state = __I40EVF_INIT_SW;
                break;
        default:
                goto err_alloc;
        }
        if (i40evf_process_config(adapter))
                goto err_alloc;
        adapter->current_op = I40E_VIRTCHNL_OP_UNKNOWN;

        adapter->flags |= I40EVF_FLAG_RX_CSUM_ENABLED;

        netdev->netdev_ops = &i40evf_netdev_ops;
        i40evf_set_ethtool_ops(netdev);
        netdev->watchdog_timeo = 5 * HZ;

        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 {
                adapter->flags |= I40EVF_FLAG_ADDR_SET_BY_PF;
                ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
                ether_addr_copy(netdev->perm_addr, adapter->hw.mac.addr);
        }

        init_timer(&adapter->watchdog_timer);
        adapter->watchdog_timer.function = &i40evf_watchdog_timer;
        adapter->watchdog_timer.data = (unsigned long)adapter;
        mod_timer(&adapter->watchdog_timer, jiffies + 1);

        adapter->num_active_queues = min_t(int,
                                           adapter->vsi_res->num_queue_pairs,
                                           (int)(num_online_cpus()));
        adapter->tx_desc_count = I40EVF_DEFAULT_TXD;
        adapter->rx_desc_count = I40EVF_DEFAULT_RXD;
        err = i40evf_init_interrupt_scheme(adapter);
        if (err)
                goto err_sw_init;
        i40evf_map_rings_to_vectors(adapter);
        if (adapter->vf_res->vf_offload_flags &
                    I40E_VIRTCHNL_VF_OFFLOAD_WB_ON_ITR)
                adapter->flags |= I40EVF_FLAG_WB_ON_ITR_CAPABLE;
        if (!RSS_AQ(adapter))
                i40evf_configure_rss(adapter);
        err = i40evf_request_misc_irq(adapter);
        if (err)
                goto err_sw_init;

        netif_carrier_off(netdev);

        if (!adapter->netdev_registered) {
                err = register_netdev(netdev);
                if (err)
                        goto err_register;
        }

        adapter->netdev_registered = true;

        netif_tx_stop_all_queues(netdev);

        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");

        dev_info(&pdev->dev, "%s\n", i40evf_driver_string);
        adapter->state = __I40EVF_DOWN;
        set_bit(__I40E_DOWN, &adapter->vsi.state);
        i40evf_misc_irq_enable(adapter);

        if (RSS_AQ(adapter)) {
                adapter->aq_required |= I40EVF_FLAG_AQ_CONFIGURE_RSS;
                mod_timer_pending(&adapter->watchdog_timer, jiffies + 1);
        } else {
                i40evf_configure_rss(adapter);
        }
        return;
restart:
        schedule_delayed_work(&adapter->init_task, msecs_to_jiffies(30));
        return;

err_register:
        i40evf_free_misc_irq(adapter);
err_sw_init:
        i40evf_reset_interrupt_capability(adapter);
err_alloc:
        kfree(adapter->vf_res);
        adapter->vf_res = NULL;
err:
        /* Things went into the weeds, so try again later */
        if (++adapter->aq_wait_count > I40EVF_AQ_MAX_ERR) {
                dev_err(&pdev->dev, "Failed to communicate with PF; waiting before retry\n");
                adapter->flags |= I40EVF_FLAG_PF_COMMS_FAILED;
                i40evf_shutdown_adminq(hw);
                adapter->state = __I40EVF_STARTUP;
                schedule_delayed_work(&adapter->init_task, HZ * 5);
                return;
        }
        schedule_delayed_work(&adapter->init_task, HZ);
}

/**
 * i40evf_shutdown - Shutdown the device in preparation for a reboot
 * @pdev: pci device structure
 **/
static void i40evf_shutdown(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct i40evf_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (netif_running(netdev))
                i40evf_close(netdev);

        /* Prevent the watchdog from running. */
        adapter->state = __I40EVF_REMOVE;
        adapter->aq_required = 0;

#ifdef CONFIG_PM
        pci_save_state(pdev);

#endif
        pci_disable_device(pdev);
}

/**
 * i40evf_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in i40evf_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * i40evf_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 i40evf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct i40evf_adapter *adapter = NULL;
        struct i40e_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, i40evf_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 i40evf_adapter),
                                   MAX_TX_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;
        adapter->state = __I40EVF_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);

        INIT_LIST_HEAD(&adapter->mac_filter_list);
        INIT_LIST_HEAD(&adapter->vlan_filter_list);

        INIT_WORK(&adapter->reset_task, i40evf_reset_task);
        INIT_WORK(&adapter->adminq_task, i40evf_adminq_task);
        INIT_WORK(&adapter->watchdog_task, i40evf_watchdog_task);
        INIT_DELAYED_WORK(&adapter->init_task, i40evf_init_task);
        schedule_delayed_work(&adapter->init_task,
                              msecs_to_jiffies(5 * (pdev->devfn & 0x07)));

        return 0;

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

#ifdef CONFIG_PM
/**
 * i40evf_suspend - Power management suspend routine
 * @pdev: PCI device information struct
 * @state: unused
 *
 * Called when the system (VM) is entering sleep/suspend.
 **/
static int i40evf_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        int retval = 0;

        netif_device_detach(netdev);

        if (netif_running(netdev)) {
                rtnl_lock();
                i40evf_down(adapter);
                rtnl_unlock();
        }
        i40evf_free_misc_irq(adapter);
        i40evf_reset_interrupt_capability(adapter);

        retval = pci_save_state(pdev);
        if (retval)
                return retval;

        pci_disable_device(pdev);

        return 0;
}

/**
 * i40evf_resume - Power management resume routine
 * @pdev: PCI device information struct
 *
 * Called when the system (VM) is resumed from sleep/suspend.
 **/
static int i40evf_resume(struct pci_dev *pdev)
{
        struct i40evf_adapter *adapter = pci_get_drvdata(pdev);
        struct net_device *netdev = adapter->netdev;
        u32 err;

        pci_set_power_state(pdev, PCI_D0);
        pci_restore_state(pdev);
        /* pci_restore_state clears dev->state_saved so call
         * pci_save_state to restore it.
         */
        pci_save_state(pdev);

        err = pci_enable_device_mem(pdev);
        if (err) {
                dev_err(&pdev->dev, "Cannot enable PCI device from suspend.\n");
                return err;
        }
        pci_set_master(pdev);

        rtnl_lock();
        err = i40evf_set_interrupt_capability(adapter);
        if (err) {
                rtnl_unlock();
                dev_err(&pdev->dev, "Cannot enable MSI-X interrupts.\n");
                return err;
        }
        err = i40evf_request_misc_irq(adapter);
        rtnl_unlock();
        if (err) {
                dev_err(&pdev->dev, "Cannot get interrupt vector.\n");
                return err;
        }

        schedule_work(&adapter->reset_task);

        netif_device_attach(netdev);

        return err;
}

#endif /* CONFIG_PM */
/**
 * i40evf_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * i40evf_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 i40evf_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct i40evf_adapter *adapter = netdev_priv(netdev);
        struct i40evf_mac_filter *f, *ftmp;
        struct i40e_hw *hw = &adapter->hw;

        cancel_delayed_work_sync(&adapter->init_task);
        cancel_work_sync(&adapter->reset_task);

        if (adapter->netdev_registered) {
                unregister_netdev(netdev);
                adapter->netdev_registered = false;
        }

        /* Shut down all the garbage mashers on the detention level */
        adapter->state = __I40EVF_REMOVE;
        adapter->aq_required = 0;
        i40evf_request_reset(adapter);
        msleep(20);
        /* If the FW isn't responding, kick it once, but only once. */
        if (!i40evf_asq_done(hw)) {
                i40evf_request_reset(adapter);
                msleep(20);
        }

        if (adapter->msix_entries) {
                i40evf_misc_irq_disable(adapter);
                i40evf_free_misc_irq(adapter);
                i40evf_reset_interrupt_capability(adapter);
                i40evf_free_q_vectors(adapter);
        }

        if (adapter->watchdog_timer.function)
                del_timer_sync(&adapter->watchdog_timer);

        flush_scheduled_work();

        if (hw->aq.asq.count)
                i40evf_shutdown_adminq(hw);

        iounmap(hw->hw_addr);
        pci_release_regions(pdev);

        i40evf_free_all_tx_resources(adapter);
        i40evf_free_all_rx_resources(adapter);
        i40evf_free_queues(adapter);
        kfree(adapter->vf_res);
        /* 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(f, ftmp, &adapter->vlan_filter_list, list) {
                list_del(&f->list);
                kfree(f);
        }

        free_netdev(netdev);

        pci_disable_pcie_error_reporting(pdev);

        pci_disable_device(pdev);
}

static struct pci_driver i40evf_driver = {
        .name     = i40evf_driver_name,
        .id_table = i40evf_pci_tbl,
        .probe    = i40evf_probe,
        .remove   = i40evf_remove,
#ifdef CONFIG_PM
        .suspend  = i40evf_suspend,
        .resume   = i40evf_resume,
#endif
        .shutdown = i40evf_shutdown,
};

/**
 * i40e_init_module - Driver Registration Routine
 *
 * i40e_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init i40evf_init_module(void)
{
        int ret;

        pr_info("i40evf: %s - version %s\n", i40evf_driver_string,
                i40evf_driver_version);

        pr_info("%s\n", i40evf_copyright);

        ret = pci_register_driver(&i40evf_driver);
        return ret;
}

module_init(i40evf_init_module);

/**
 * i40e_exit_module - Driver Exit Cleanup Routine
 *
 * i40e_exit_module is called just before the driver is removed
 * from memory.
 **/
static void __exit i40evf_exit_module(void)
{
        pci_unregister_driver(&i40evf_driver);
}

module_exit(i40evf_exit_module);

/* i40evf_main.c */