// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 1999 - 2018 Intel Corporation. */

/******************************************************************************
 Copyright (c)2006 - 2007 Myricom, Inc. for some LRO specific code
******************************************************************************/

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/netdevice.h>
#include <linux/vmalloc.h>
#include <linux/string.h>
#include <linux/in.h>
#include <linux/ip.h>
#include <linux/tcp.h>
#include <linux/sctp.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/ethtool.h>
#include <linux/if.h>
#include <linux/if_vlan.h>
#include <linux/prefetch.h>
#include <net/mpls.h>
#include <linux/bpf.h>
#include <linux/bpf_trace.h>
#include <linux/atomic.h>
#include <net/xfrm.h>

#include "ixgbevf.h"

const char ixgbevf_driver_name[] = "ixgbevf";
static const char ixgbevf_driver_string[] =
        "Intel(R) 10 Gigabit PCI Express Virtual Function Network Driver";

static char ixgbevf_copyright[] =
        "Copyright (c) 2009 - 2018 Intel Corporation.";

static const struct ixgbevf_info *ixgbevf_info_tbl[] = {
        [board_82599_vf]        = &ixgbevf_82599_vf_info,
        [board_82599_vf_hv]     = &ixgbevf_82599_vf_hv_info,
        [board_X540_vf]         = &ixgbevf_X540_vf_info,
        [board_X540_vf_hv]      = &ixgbevf_X540_vf_hv_info,
        [board_X550_vf]         = &ixgbevf_X550_vf_info,
        [board_X550_vf_hv]      = &ixgbevf_X550_vf_hv_info,
        [board_X550EM_x_vf]     = &ixgbevf_X550EM_x_vf_info,
        [board_X550EM_x_vf_hv]  = &ixgbevf_X550EM_x_vf_hv_info,
        [board_x550em_a_vf]     = &ixgbevf_x550em_a_vf_info,
};

/* ixgbevf_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 ixgbevf_pci_tbl[] = {
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF), board_82599_vf },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF_HV), board_82599_vf_hv },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF), board_X540_vf },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF_HV), board_X540_vf_hv },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550_VF), board_X550_vf },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550_VF_HV), board_X550_vf_hv },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550EM_X_VF), board_X550EM_x_vf },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550EM_X_VF_HV), board_X550EM_x_vf_hv},
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X550EM_A_VF), board_x550em_a_vf },
        /* required last entry */
        {0, }
};
MODULE_DEVICE_TABLE(pci, ixgbevf_pci_tbl);

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) 10 Gigabit Virtual Function Network Driver");
MODULE_LICENSE("GPL v2");

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

static struct workqueue_struct *ixgbevf_wq;

static void ixgbevf_service_event_schedule(struct ixgbevf_adapter *adapter)
{
        if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
            !test_bit(__IXGBEVF_REMOVING, &adapter->state) &&
            !test_and_set_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state))
                queue_work(ixgbevf_wq, &adapter->service_task);
}

static void ixgbevf_service_event_complete(struct ixgbevf_adapter *adapter)
{
        BUG_ON(!test_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state));

        /* flush memory to make sure state is correct before next watchdog */
        smp_mb__before_atomic();
        clear_bit(__IXGBEVF_SERVICE_SCHED, &adapter->state);
}

/* forward decls */
static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter);
static void ixgbevf_set_itr(struct ixgbevf_q_vector *q_vector);
static void ixgbevf_free_all_rx_resources(struct ixgbevf_adapter *adapter);
static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer);
static void ixgbevf_reuse_rx_page(struct ixgbevf_ring *rx_ring,
                                  struct ixgbevf_rx_buffer *old_buff);

static void ixgbevf_remove_adapter(struct ixgbe_hw *hw)
{
        struct ixgbevf_adapter *adapter = hw->back;

        if (!hw->hw_addr)
                return;
        hw->hw_addr = NULL;
        dev_err(&adapter->pdev->dev, "Adapter removed\n");
        if (test_bit(__IXGBEVF_SERVICE_INITED, &adapter->state))
                ixgbevf_service_event_schedule(adapter);
}

static void ixgbevf_check_remove(struct ixgbe_hw *hw, u32 reg)
{
        u32 value;

        /* The following check not only optimizes a bit by not
         * performing a read on the status register when the
         * register just read was a status register read that
         * returned IXGBE_FAILED_READ_REG. It also blocks any
         * potential recursion.
         */
        if (reg == IXGBE_VFSTATUS) {
                ixgbevf_remove_adapter(hw);
                return;
        }
        value = ixgbevf_read_reg(hw, IXGBE_VFSTATUS);
        if (value == IXGBE_FAILED_READ_REG)
                ixgbevf_remove_adapter(hw);
}

u32 ixgbevf_read_reg(struct ixgbe_hw *hw, u32 reg)
{
        u8 __iomem *reg_addr = READ_ONCE(hw->hw_addr);
        u32 value;

        if (IXGBE_REMOVED(reg_addr))
                return IXGBE_FAILED_READ_REG;
        value = readl(reg_addr + reg);
        if (unlikely(value == IXGBE_FAILED_READ_REG))
                ixgbevf_check_remove(hw, reg);
        return value;
}

/**
 * ixgbevf_set_ivar - set IVAR registers - maps interrupt causes to vectors
 * @adapter: pointer to adapter struct
 * @direction: 0 for Rx, 1 for Tx, -1 for other causes
 * @queue: queue to map the corresponding interrupt to
 * @msix_vector: the vector to map to the corresponding queue
 **/
static void ixgbevf_set_ivar(struct ixgbevf_adapter *adapter, s8 direction,
                             u8 queue, u8 msix_vector)
{
        u32 ivar, index;
        struct ixgbe_hw *hw = &adapter->hw;

        if (direction == -1) {
                /* other causes */
                msix_vector |= IXGBE_IVAR_ALLOC_VAL;
                ivar = IXGBE_READ_REG(hw, IXGBE_VTIVAR_MISC);
                ivar &= ~0xFF;
                ivar |= msix_vector;
                IXGBE_WRITE_REG(hw, IXGBE_VTIVAR_MISC, ivar);
        } else {
                /* Tx or Rx causes */
                msix_vector |= IXGBE_IVAR_ALLOC_VAL;
                index = ((16 * (queue & 1)) + (8 * direction));
                ivar = IXGBE_READ_REG(hw, IXGBE_VTIVAR(queue >> 1));
                ivar &= ~(0xFF << index);
                ivar |= (msix_vector << index);
                IXGBE_WRITE_REG(hw, IXGBE_VTIVAR(queue >> 1), ivar);
        }
}

static u64 ixgbevf_get_tx_completed(struct ixgbevf_ring *ring)
{
        return ring->stats.packets;
}

static u32 ixgbevf_get_tx_pending(struct ixgbevf_ring *ring)
{
        struct ixgbevf_adapter *adapter = netdev_priv(ring->netdev);
        struct ixgbe_hw *hw = &adapter->hw;

        u32 head = IXGBE_READ_REG(hw, IXGBE_VFTDH(ring->reg_idx));
        u32 tail = IXGBE_READ_REG(hw, IXGBE_VFTDT(ring->reg_idx));

        if (head != tail)
                return (head < tail) ?
                        tail - head : (tail + ring->count - head);

        return 0;
}

static inline bool ixgbevf_check_tx_hang(struct ixgbevf_ring *tx_ring)
{
        u32 tx_done = ixgbevf_get_tx_completed(tx_ring);
        u32 tx_done_old = tx_ring->tx_stats.tx_done_old;
        u32 tx_pending = ixgbevf_get_tx_pending(tx_ring);

        clear_check_for_tx_hang(tx_ring);

        /* Check for a hung queue, but be thorough. This verifies
         * that a transmit has been completed since the previous
         * check AND there is at least one packet pending. The
         * ARMED bit is set to indicate a potential hang.
         */
        if ((tx_done_old == tx_done) && tx_pending) {
                /* make sure it is true for two checks in a row */
                return test_and_set_bit(__IXGBEVF_HANG_CHECK_ARMED,
                                        &tx_ring->state);
        }
        /* reset the countdown */
        clear_bit(__IXGBEVF_HANG_CHECK_ARMED, &tx_ring->state);

        /* update completed stats and continue */
        tx_ring->tx_stats.tx_done_old = tx_done;

        return false;
}

static void ixgbevf_tx_timeout_reset(struct ixgbevf_adapter *adapter)
{
        /* Do the reset outside of interrupt context */
        if (!test_bit(__IXGBEVF_DOWN, &adapter->state)) {
                set_bit(__IXGBEVF_RESET_REQUESTED, &adapter->state);
                ixgbevf_service_event_schedule(adapter);
        }
}

/**
 * ixgbevf_tx_timeout - Respond to a Tx Hang
 * @netdev: network interface device structure
 **/
static void ixgbevf_tx_timeout(struct net_device *netdev, unsigned int txqueue)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);

        ixgbevf_tx_timeout_reset(adapter);
}

/**
 * ixgbevf_clean_tx_irq - Reclaim resources after transmit completes
 * @q_vector: board private structure
 * @tx_ring: tx ring to clean
 * @napi_budget: Used to determine if we are in netpoll
 **/
static bool ixgbevf_clean_tx_irq(struct ixgbevf_q_vector *q_vector,
                                 struct ixgbevf_ring *tx_ring, int napi_budget)
{
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        struct ixgbevf_tx_buffer *tx_buffer;
        union ixgbe_adv_tx_desc *tx_desc;
        unsigned int total_bytes = 0, total_packets = 0, total_ipsec = 0;
        unsigned int budget = tx_ring->count / 2;
        unsigned int i = tx_ring->next_to_clean;

        if (test_bit(__IXGBEVF_DOWN, &adapter->state))
                return true;

        tx_buffer = &tx_ring->tx_buffer_info[i];
        tx_desc = IXGBEVF_TX_DESC(tx_ring, i);
        i -= tx_ring->count;

        do {
                union ixgbe_adv_tx_desc *eop_desc = tx_buffer->next_to_watch;

                /* if next_to_watch is not set then there is no work pending */
                if (!eop_desc)
                        break;

                /* prevent any other reads prior to eop_desc */
                smp_rmb();

                /* if DD is not set pending work has not been completed */
                if (!(eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)))
                        break;

                /* clear next_to_watch to prevent false hangs */
                tx_buffer->next_to_watch = NULL;

                /* update the statistics for this packet */
                total_bytes += tx_buffer->bytecount;
                total_packets += tx_buffer->gso_segs;
                if (tx_buffer->tx_flags & IXGBE_TX_FLAGS_IPSEC)
                        total_ipsec++;

                /* free the skb */
                if (ring_is_xdp(tx_ring))
                        page_frag_free(tx_buffer->data);
                else
                        napi_consume_skb(tx_buffer->skb, napi_budget);

                /* unmap skb header data */
                dma_unmap_single(tx_ring->dev,
                                 dma_unmap_addr(tx_buffer, dma),
                                 dma_unmap_len(tx_buffer, len),
                                 DMA_TO_DEVICE);

                /* clear tx_buffer data */
                dma_unmap_len_set(tx_buffer, len, 0);

                /* unmap remaining buffers */
                while (tx_desc != eop_desc) {
                        tx_buffer++;
                        tx_desc++;
                        i++;
                        if (unlikely(!i)) {
                                i -= tx_ring->count;
                                tx_buffer = tx_ring->tx_buffer_info;
                                tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
                        }

                        /* unmap any remaining paged data */
                        if (dma_unmap_len(tx_buffer, len)) {
                                dma_unmap_page(tx_ring->dev,
                                               dma_unmap_addr(tx_buffer, dma),
                                               dma_unmap_len(tx_buffer, len),
                                               DMA_TO_DEVICE);
                                dma_unmap_len_set(tx_buffer, len, 0);
                        }
                }

                /* move us one more past the eop_desc for start of next pkt */
                tx_buffer++;
                tx_desc++;
                i++;
                if (unlikely(!i)) {
                        i -= tx_ring->count;
                        tx_buffer = tx_ring->tx_buffer_info;
                        tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
                }

                /* issue prefetch for next Tx descriptor */
                prefetch(tx_desc);

                /* update budget accounting */
                budget--;
        } while (likely(budget));

        i += tx_ring->count;
        tx_ring->next_to_clean = i;
        u64_stats_update_begin(&tx_ring->syncp);
        tx_ring->stats.bytes += total_bytes;
        tx_ring->stats.packets += total_packets;
        u64_stats_update_end(&tx_ring->syncp);
        q_vector->tx.total_bytes += total_bytes;
        q_vector->tx.total_packets += total_packets;
        adapter->tx_ipsec += total_ipsec;

        if (check_for_tx_hang(tx_ring) && ixgbevf_check_tx_hang(tx_ring)) {
                struct ixgbe_hw *hw = &adapter->hw;
                union ixgbe_adv_tx_desc *eop_desc;

                eop_desc = tx_ring->tx_buffer_info[i].next_to_watch;

                pr_err("Detected Tx Unit Hang%s\n"
                       "  Tx Queue             <%d>\n"
                       "  TDH, TDT             <%x>, <%x>\n"
                       "  next_to_use          <%x>\n"
                       "  next_to_clean        <%x>\n"
                       "tx_buffer_info[next_to_clean]\n"
                       "  next_to_watch        <%p>\n"
                       "  eop_desc->wb.status  <%x>\n"
                       "  time_stamp           <%lx>\n"
                       "  jiffies              <%lx>\n",
                       ring_is_xdp(tx_ring) ? " XDP" : "",
                       tx_ring->queue_index,
                       IXGBE_READ_REG(hw, IXGBE_VFTDH(tx_ring->reg_idx)),
                       IXGBE_READ_REG(hw, IXGBE_VFTDT(tx_ring->reg_idx)),
                       tx_ring->next_to_use, i,
                       eop_desc, (eop_desc ? eop_desc->wb.status : 0),
                       tx_ring->tx_buffer_info[i].time_stamp, jiffies);

                if (!ring_is_xdp(tx_ring))
                        netif_stop_subqueue(tx_ring->netdev,
                                            tx_ring->queue_index);

                /* schedule immediate reset if we believe we hung */
                ixgbevf_tx_timeout_reset(adapter);

                return true;
        }

        if (ring_is_xdp(tx_ring))
                return !!budget;

#define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
        if (unlikely(total_packets && netif_carrier_ok(tx_ring->netdev) &&
                     (ixgbevf_desc_unused(tx_ring) >= TX_WAKE_THRESHOLD))) {
                /* Make sure that anybody stopping the queue after this
                 * sees the new next_to_clean.
                 */
                smp_mb();

                if (__netif_subqueue_stopped(tx_ring->netdev,
                                             tx_ring->queue_index) &&
                    !test_bit(__IXGBEVF_DOWN, &adapter->state)) {
                        netif_wake_subqueue(tx_ring->netdev,
                                            tx_ring->queue_index);
                        ++tx_ring->tx_stats.restart_queue;
                }
        }

        return !!budget;
}

/**
 * ixgbevf_rx_skb - Helper function to determine proper Rx method
 * @q_vector: structure containing interrupt and ring information
 * @skb: packet to send up
 **/
static void ixgbevf_rx_skb(struct ixgbevf_q_vector *q_vector,
                           struct sk_buff *skb)
{
        napi_gro_receive(&q_vector->napi, skb);
}

#define IXGBE_RSS_L4_TYPES_MASK \
        ((1ul << IXGBE_RXDADV_RSSTYPE_IPV4_TCP) | \
         (1ul << IXGBE_RXDADV_RSSTYPE_IPV4_UDP) | \
         (1ul << IXGBE_RXDADV_RSSTYPE_IPV6_TCP) | \
         (1ul << IXGBE_RXDADV_RSSTYPE_IPV6_UDP))

static inline void ixgbevf_rx_hash(struct ixgbevf_ring *ring,
                                   union ixgbe_adv_rx_desc *rx_desc,
                                   struct sk_buff *skb)
{
        u16 rss_type;

        if (!(ring->netdev->features & NETIF_F_RXHASH))
                return;

        rss_type = le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.pkt_info) &
                   IXGBE_RXDADV_RSSTYPE_MASK;

        if (!rss_type)
                return;

        skb_set_hash(skb, le32_to_cpu(rx_desc->wb.lower.hi_dword.rss),
                     (IXGBE_RSS_L4_TYPES_MASK & (1ul << rss_type)) ?
                     PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
}

/**
 * ixgbevf_rx_checksum - indicate in skb if hw indicated a good cksum
 * @ring: structure containig ring specific data
 * @rx_desc: current Rx descriptor being processed
 * @skb: skb currently being received and modified
 **/
static inline void ixgbevf_rx_checksum(struct ixgbevf_ring *ring,
                                       union ixgbe_adv_rx_desc *rx_desc,
                                       struct sk_buff *skb)
{
        skb_checksum_none_assert(skb);

        /* Rx csum disabled */
        if (!(ring->netdev->features & NETIF_F_RXCSUM))
                return;

        /* if IP and error */
        if (ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_IPCS) &&
            ixgbevf_test_staterr(rx_desc, IXGBE_RXDADV_ERR_IPE)) {
                ring->rx_stats.csum_err++;
                return;
        }

        if (!ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_L4CS))
                return;

        if (ixgbevf_test_staterr(rx_desc, IXGBE_RXDADV_ERR_TCPE)) {
                ring->rx_stats.csum_err++;
                return;
        }

        /* It must be a TCP or UDP packet with a valid checksum */
        skb->ip_summed = CHECKSUM_UNNECESSARY;
}

/**
 * ixgbevf_process_skb_fields - Populate skb header fields from Rx descriptor
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @rx_desc: pointer to the EOP Rx descriptor
 * @skb: pointer to current skb being populated
 *
 * This function checks the ring, descriptor, and packet information in
 * order to populate the checksum, VLAN, protocol, and other fields within
 * the skb.
 **/
static void ixgbevf_process_skb_fields(struct ixgbevf_ring *rx_ring,
                                       union ixgbe_adv_rx_desc *rx_desc,
                                       struct sk_buff *skb)
{
        ixgbevf_rx_hash(rx_ring, rx_desc, skb);
        ixgbevf_rx_checksum(rx_ring, rx_desc, skb);

        if (ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_VP)) {
                u16 vid = le16_to_cpu(rx_desc->wb.upper.vlan);
                unsigned long *active_vlans = netdev_priv(rx_ring->netdev);

                if (test_bit(vid & VLAN_VID_MASK, active_vlans))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
        }

        if (ixgbevf_test_staterr(rx_desc, IXGBE_RXDADV_STAT_SECP))
                ixgbevf_ipsec_rx(rx_ring, rx_desc, skb);

        skb->protocol = eth_type_trans(skb, rx_ring->netdev);
}

static
struct ixgbevf_rx_buffer *ixgbevf_get_rx_buffer(struct ixgbevf_ring *rx_ring,
                                                const unsigned int size)
{
        struct ixgbevf_rx_buffer *rx_buffer;

        rx_buffer = &rx_ring->rx_buffer_info[rx_ring->next_to_clean];
        prefetchw(rx_buffer->page);

        /* we are reusing so sync this buffer for CPU use */
        dma_sync_single_range_for_cpu(rx_ring->dev,
                                      rx_buffer->dma,
                                      rx_buffer->page_offset,
                                      size,
                                      DMA_FROM_DEVICE);

        rx_buffer->pagecnt_bias--;

        return rx_buffer;
}

static void ixgbevf_put_rx_buffer(struct ixgbevf_ring *rx_ring,
                                  struct ixgbevf_rx_buffer *rx_buffer,
                                  struct sk_buff *skb)
{
        if (ixgbevf_can_reuse_rx_page(rx_buffer)) {
                /* hand second half of page back to the ring */
                ixgbevf_reuse_rx_page(rx_ring, rx_buffer);
        } else {
                if (IS_ERR(skb))
                        /* We are not reusing the buffer so unmap it and free
                         * any references we are holding to it
                         */
                        dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
                                             ixgbevf_rx_pg_size(rx_ring),
                                             DMA_FROM_DEVICE,
                                             IXGBEVF_RX_DMA_ATTR);
                __page_frag_cache_drain(rx_buffer->page,
                                        rx_buffer->pagecnt_bias);
        }

        /* clear contents of rx_buffer */
        rx_buffer->page = NULL;
}

/**
 * ixgbevf_is_non_eop - process handling of non-EOP buffers
 * @rx_ring: Rx ring being processed
 * @rx_desc: Rx descriptor for current buffer
 *
 * This function updates next to clean.  If the buffer is an EOP buffer
 * this function exits returning false, otherwise it will place the
 * sk_buff in the next buffer to be chained and return true indicating
 * that this is in fact a non-EOP buffer.
 **/
static bool ixgbevf_is_non_eop(struct ixgbevf_ring *rx_ring,
                               union ixgbe_adv_rx_desc *rx_desc)
{
        u32 ntc = rx_ring->next_to_clean + 1;

        /* fetch, update, and store next to clean */
        ntc = (ntc < rx_ring->count) ? ntc : 0;
        rx_ring->next_to_clean = ntc;

        prefetch(IXGBEVF_RX_DESC(rx_ring, ntc));

        if (likely(ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_EOP)))
                return false;

        return true;
}

static inline unsigned int ixgbevf_rx_offset(struct ixgbevf_ring *rx_ring)
{
        return ring_uses_build_skb(rx_ring) ? IXGBEVF_SKB_PAD : 0;
}

static bool ixgbevf_alloc_mapped_page(struct ixgbevf_ring *rx_ring,
                                      struct ixgbevf_rx_buffer *bi)
{
        struct page *page = bi->page;
        dma_addr_t dma;

        /* since we are recycling buffers we should seldom need to alloc */
        if (likely(page))
                return true;

        /* alloc new page for storage */
        page = dev_alloc_pages(ixgbevf_rx_pg_order(rx_ring));
        if (unlikely(!page)) {
                rx_ring->rx_stats.alloc_rx_page_failed++;
                return false;
        }

        /* map page for use */
        dma = dma_map_page_attrs(rx_ring->dev, page, 0,
                                 ixgbevf_rx_pg_size(rx_ring),
                                 DMA_FROM_DEVICE, IXGBEVF_RX_DMA_ATTR);

        /* if mapping failed free memory back to system since
         * there isn't much point in holding memory we can't use
         */
        if (dma_mapping_error(rx_ring->dev, dma)) {
                __free_pages(page, ixgbevf_rx_pg_order(rx_ring));

                rx_ring->rx_stats.alloc_rx_page_failed++;
                return false;
        }

        bi->dma = dma;
        bi->page = page;
        bi->page_offset = ixgbevf_rx_offset(rx_ring);
        bi->pagecnt_bias = 1;
        rx_ring->rx_stats.alloc_rx_page++;

        return true;
}

/**
 * ixgbevf_alloc_rx_buffers - Replace used receive buffers; packet split
 * @rx_ring: rx descriptor ring (for a specific queue) to setup buffers on
 * @cleaned_count: number of buffers to replace
 **/
static void ixgbevf_alloc_rx_buffers(struct ixgbevf_ring *rx_ring,
                                     u16 cleaned_count)
{
        union ixgbe_adv_rx_desc *rx_desc;
        struct ixgbevf_rx_buffer *bi;
        unsigned int i = rx_ring->next_to_use;

        /* nothing to do or no valid netdev defined */
        if (!cleaned_count || !rx_ring->netdev)
                return;

        rx_desc = IXGBEVF_RX_DESC(rx_ring, i);
        bi = &rx_ring->rx_buffer_info[i];
        i -= rx_ring->count;

        do {
                if (!ixgbevf_alloc_mapped_page(rx_ring, bi))
                        break;

                /* sync the buffer for use by the device */
                dma_sync_single_range_for_device(rx_ring->dev, bi->dma,
                                                 bi->page_offset,
                                                 ixgbevf_rx_bufsz(rx_ring),
                                                 DMA_FROM_DEVICE);

                /* Refresh the desc even if pkt_addr didn't change
                 * because each write-back erases this info.
                 */
                rx_desc->read.pkt_addr = cpu_to_le64(bi->dma + bi->page_offset);

                rx_desc++;
                bi++;
                i++;
                if (unlikely(!i)) {
                        rx_desc = IXGBEVF_RX_DESC(rx_ring, 0);
                        bi = rx_ring->rx_buffer_info;
                        i -= rx_ring->count;
                }

                /* clear the length for the next_to_use descriptor */
                rx_desc->wb.upper.length = 0;

                cleaned_count--;
        } while (cleaned_count);

        i += rx_ring->count;

        if (rx_ring->next_to_use != i) {
                /* record the next descriptor to use */
                rx_ring->next_to_use = i;

                /* update next to alloc since we have filled the ring */
                rx_ring->next_to_alloc = i;

                /* Force memory writes to complete before letting h/w
                 * know there are new descriptors to fetch.  (Only
                 * applicable for weak-ordered memory model archs,
                 * such as IA-64).
                 */
                wmb();
                ixgbevf_write_tail(rx_ring, i);
        }
}

/**
 * ixgbevf_cleanup_headers - Correct corrupted or empty headers
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @rx_desc: pointer to the EOP Rx descriptor
 * @skb: pointer to current skb being fixed
 *
 * Check for corrupted packet headers caused by senders on the local L2
 * embedded NIC switch not setting up their Tx Descriptors right.  These
 * should be very rare.
 *
 * Also address the case where we are pulling data in on pages only
 * and as such no data is present in the skb header.
 *
 * In addition if skb is not at least 60 bytes we need to pad it so that
 * it is large enough to qualify as a valid Ethernet frame.
 *
 * Returns true if an error was encountered and skb was freed.
 **/
static bool ixgbevf_cleanup_headers(struct ixgbevf_ring *rx_ring,
                                    union ixgbe_adv_rx_desc *rx_desc,
                                    struct sk_buff *skb)
{
        /* XDP packets use error pointer so abort at this point */
        if (IS_ERR(skb))
                return true;

        /* verify that the packet does not have any known errors */
        if (unlikely(ixgbevf_test_staterr(rx_desc,
                                          IXGBE_RXDADV_ERR_FRAME_ERR_MASK))) {
                struct net_device *netdev = rx_ring->netdev;

                if (!(netdev->features & NETIF_F_RXALL)) {
                        dev_kfree_skb_any(skb);
                        return true;
                }
        }

        /* if eth_skb_pad returns an error the skb was freed */
        if (eth_skb_pad(skb))
                return true;

        return false;
}

/**
 * ixgbevf_reuse_rx_page - page flip buffer and store it back on the ring
 * @rx_ring: rx descriptor ring to store buffers on
 * @old_buff: donor buffer to have page reused
 *
 * Synchronizes page for reuse by the adapter
 **/
static void ixgbevf_reuse_rx_page(struct ixgbevf_ring *rx_ring,
                                  struct ixgbevf_rx_buffer *old_buff)
{
        struct ixgbevf_rx_buffer *new_buff;
        u16 nta = rx_ring->next_to_alloc;

        new_buff = &rx_ring->rx_buffer_info[nta];

        /* update, and store next to alloc */
        nta++;
        rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0;

        /* transfer page from old buffer to new buffer */
        new_buff->page = old_buff->page;
        new_buff->dma = old_buff->dma;
        new_buff->page_offset = old_buff->page_offset;
        new_buff->pagecnt_bias = old_buff->pagecnt_bias;
}

static inline bool ixgbevf_page_is_reserved(struct page *page)
{
        return (page_to_nid(page) != numa_mem_id()) || page_is_pfmemalloc(page);
}

static bool ixgbevf_can_reuse_rx_page(struct ixgbevf_rx_buffer *rx_buffer)
{
        unsigned int pagecnt_bias = rx_buffer->pagecnt_bias;
        struct page *page = rx_buffer->page;

        /* avoid re-using remote pages */
        if (unlikely(ixgbevf_page_is_reserved(page)))
                return false;

#if (PAGE_SIZE < 8192)
        /* if we are only owner of page we can reuse it */
        if (unlikely((page_ref_count(page) - pagecnt_bias) > 1))
                return false;
#else
#define IXGBEVF_LAST_OFFSET \
        (SKB_WITH_OVERHEAD(PAGE_SIZE) - IXGBEVF_RXBUFFER_2048)

        if (rx_buffer->page_offset > IXGBEVF_LAST_OFFSET)
                return false;

#endif

        /* If we have drained the page fragment pool we need to update
         * the pagecnt_bias and page count so that we fully restock the
         * number of references the driver holds.
         */
        if (unlikely(!pagecnt_bias)) {
                page_ref_add(page, USHRT_MAX);
                rx_buffer->pagecnt_bias = USHRT_MAX;
        }

        return true;
}

/**
 * ixgbevf_add_rx_frag - Add contents of Rx buffer to sk_buff
 * @rx_ring: rx descriptor ring to transact packets on
 * @rx_buffer: buffer containing page to add
 * @skb: sk_buff to place the data into
 * @size: size of buffer to be added
 *
 * This function will add the data contained in rx_buffer->page to the skb.
 **/
static void ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring,
                                struct ixgbevf_rx_buffer *rx_buffer,
                                struct sk_buff *skb,
                                unsigned int size)
{
#if (PAGE_SIZE < 8192)
        unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
        unsigned int truesize = ring_uses_build_skb(rx_ring) ?
                                SKB_DATA_ALIGN(IXGBEVF_SKB_PAD + size) :
                                SKB_DATA_ALIGN(size);
#endif
        skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, rx_buffer->page,
                        rx_buffer->page_offset, size, truesize);
#if (PAGE_SIZE < 8192)
        rx_buffer->page_offset ^= truesize;
#else
        rx_buffer->page_offset += truesize;
#endif
}

static
struct sk_buff *ixgbevf_construct_skb(struct ixgbevf_ring *rx_ring,
                                      struct ixgbevf_rx_buffer *rx_buffer,
                                      struct xdp_buff *xdp,
                                      union ixgbe_adv_rx_desc *rx_desc)
{
        unsigned int size = xdp->data_end - xdp->data;
#if (PAGE_SIZE < 8192)
        unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
        unsigned int truesize = SKB_DATA_ALIGN(xdp->data_end -
                                               xdp->data_hard_start);
#endif
        unsigned int headlen;
        struct sk_buff *skb;

        /* prefetch first cache line of first page */
        prefetch(xdp->data);
#if L1_CACHE_BYTES < 128
        prefetch(xdp->data + L1_CACHE_BYTES);
#endif
        /* Note, we get here by enabling legacy-rx via:
         *
         *    ethtool --set-priv-flags <dev> legacy-rx on
         *
         * In this mode, we currently get 0 extra XDP headroom as
         * opposed to having legacy-rx off, where we process XDP
         * packets going to stack via ixgbevf_build_skb().
         *
         * For ixgbevf_construct_skb() mode it means that the
         * xdp->data_meta will always point to xdp->data, since
         * the helper cannot expand the head. Should this ever
         * changed in future for legacy-rx mode on, then lets also
         * add xdp->data_meta handling here.
         */

        /* allocate a skb to store the frags */
        skb = napi_alloc_skb(&rx_ring->q_vector->napi, IXGBEVF_RX_HDR_SIZE);
        if (unlikely(!skb))
                return NULL;

        /* Determine available headroom for copy */
        headlen = size;
        if (headlen > IXGBEVF_RX_HDR_SIZE)
                headlen = eth_get_headlen(skb->dev, xdp->data,
                                          IXGBEVF_RX_HDR_SIZE);

        /* align pull length to size of long to optimize memcpy performance */
        memcpy(__skb_put(skb, headlen), xdp->data,
               ALIGN(headlen, sizeof(long)));

        /* update all of the pointers */
        size -= headlen;
        if (size) {
                skb_add_rx_frag(skb, 0, rx_buffer->page,
                                (xdp->data + headlen) -
                                        page_address(rx_buffer->page),
                                size, truesize);
#if (PAGE_SIZE < 8192)
                rx_buffer->page_offset ^= truesize;
#else
                rx_buffer->page_offset += truesize;
#endif
        } else {
                rx_buffer->pagecnt_bias++;
        }

        return skb;
}

static inline void ixgbevf_irq_enable_queues(struct ixgbevf_adapter *adapter,
                                             u32 qmask)
{
        struct ixgbe_hw *hw = &adapter->hw;

        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, qmask);
}

static struct sk_buff *ixgbevf_build_skb(struct ixgbevf_ring *rx_ring,
                                         struct ixgbevf_rx_buffer *rx_buffer,
                                         struct xdp_buff *xdp,
                                         union ixgbe_adv_rx_desc *rx_desc)
{
        unsigned int metasize = xdp->data - xdp->data_meta;
#if (PAGE_SIZE < 8192)
        unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;
#else
        unsigned int truesize = SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) +
                                SKB_DATA_ALIGN(xdp->data_end -
                                               xdp->data_hard_start);
#endif
        struct sk_buff *skb;

        /* Prefetch first cache line of first page. If xdp->data_meta
         * is unused, this points to xdp->data, otherwise, we likely
         * have a consumer accessing first few bytes of meta data,
         * and then actual data.
         */
        prefetch(xdp->data_meta);
#if L1_CACHE_BYTES < 128
        prefetch(xdp->data_meta + L1_CACHE_BYTES);
#endif

        /* build an skb around the page buffer */
        skb = build_skb(xdp->data_hard_start, truesize);
        if (unlikely(!skb))
                return NULL;

        /* update pointers within the skb to store the data */
        skb_reserve(skb, xdp->data - xdp->data_hard_start);
        __skb_put(skb, xdp->data_end - xdp->data);
        if (metasize)
                skb_metadata_set(skb, metasize);

        /* update buffer offset */
#if (PAGE_SIZE < 8192)
        rx_buffer->page_offset ^= truesize;
#else
        rx_buffer->page_offset += truesize;
#endif

        return skb;
}

#define IXGBEVF_XDP_PASS 0
#define IXGBEVF_XDP_CONSUMED 1
#define IXGBEVF_XDP_TX 2

static int ixgbevf_xmit_xdp_ring(struct ixgbevf_ring *ring,
                                 struct xdp_buff *xdp)
{
        struct ixgbevf_tx_buffer *tx_buffer;
        union ixgbe_adv_tx_desc *tx_desc;
        u32 len, cmd_type;
        dma_addr_t dma;
        u16 i;

        len = xdp->data_end - xdp->data;

        if (unlikely(!ixgbevf_desc_unused(ring)))
                return IXGBEVF_XDP_CONSUMED;

        dma = dma_map_single(ring->dev, xdp->data, len, DMA_TO_DEVICE);
        if (dma_mapping_error(ring->dev, dma))
                return IXGBEVF_XDP_CONSUMED;

        /* record the location of the first descriptor for this packet */
        i = ring->next_to_use;
        tx_buffer = &ring->tx_buffer_info[i];

        dma_unmap_len_set(tx_buffer, len, len);
        dma_unmap_addr_set(tx_buffer, dma, dma);
        tx_buffer->data = xdp->data;
        tx_buffer->bytecount = len;
        tx_buffer->gso_segs = 1;
        tx_buffer->protocol = 0;

        /* Populate minimal context descriptor that will provide for the
         * fact that we are expected to process Ethernet frames.
         */
        if (!test_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state)) {
                struct ixgbe_adv_tx_context_desc *context_desc;

                set_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state);

                context_desc = IXGBEVF_TX_CTXTDESC(ring, 0);
                context_desc->vlan_macip_lens   =
                        cpu_to_le32(ETH_HLEN << IXGBE_ADVTXD_MACLEN_SHIFT);
                context_desc->fceof_saidx       = 0;
                context_desc->type_tucmd_mlhl   =
                        cpu_to_le32(IXGBE_TXD_CMD_DEXT |
                                    IXGBE_ADVTXD_DTYP_CTXT);
                context_desc->mss_l4len_idx     = 0;

                i = 1;
        }

        /* put descriptor type bits */
        cmd_type = IXGBE_ADVTXD_DTYP_DATA |
                   IXGBE_ADVTXD_DCMD_DEXT |
                   IXGBE_ADVTXD_DCMD_IFCS;
        cmd_type |= len | IXGBE_TXD_CMD;

        tx_desc = IXGBEVF_TX_DESC(ring, i);
        tx_desc->read.buffer_addr = cpu_to_le64(dma);

        tx_desc->read.cmd_type_len = cpu_to_le32(cmd_type);
        tx_desc->read.olinfo_status =
                        cpu_to_le32((len << IXGBE_ADVTXD_PAYLEN_SHIFT) |
                                    IXGBE_ADVTXD_CC);

        /* Avoid any potential race with cleanup */
        smp_wmb();

        /* set next_to_watch value indicating a packet is present */
        i++;
        if (i == ring->count)
                i = 0;

        tx_buffer->next_to_watch = tx_desc;
        ring->next_to_use = i;

        return IXGBEVF_XDP_TX;
}

static struct sk_buff *ixgbevf_run_xdp(struct ixgbevf_adapter *adapter,
                                       struct ixgbevf_ring  *rx_ring,
                                       struct xdp_buff *xdp)
{
        int result = IXGBEVF_XDP_PASS;
        struct ixgbevf_ring *xdp_ring;
        struct bpf_prog *xdp_prog;
        u32 act;

        rcu_read_lock();
        xdp_prog = READ_ONCE(rx_ring->xdp_prog);

        if (!xdp_prog)
                goto xdp_out;

        act = bpf_prog_run_xdp(xdp_prog, xdp);
        switch (act) {
        case XDP_PASS:
                break;
        case XDP_TX:
                xdp_ring = adapter->xdp_ring[rx_ring->queue_index];
                result = ixgbevf_xmit_xdp_ring(xdp_ring, xdp);
                break;
        default:
                bpf_warn_invalid_xdp_action(act);
                fallthrough;
        case XDP_ABORTED:
                trace_xdp_exception(rx_ring->netdev, xdp_prog, act);
                fallthrough; /* handle aborts by dropping packet */
        case XDP_DROP:
                result = IXGBEVF_XDP_CONSUMED;
                break;
        }
xdp_out:
        rcu_read_unlock();
        return ERR_PTR(-result);
}

static unsigned int ixgbevf_rx_frame_truesize(struct ixgbevf_ring *rx_ring,
                                              unsigned int size)
{
        unsigned int truesize;

#if (PAGE_SIZE < 8192)
        truesize = ixgbevf_rx_pg_size(rx_ring) / 2; /* Must be power-of-2 */
#else
        truesize = ring_uses_build_skb(rx_ring) ?
                SKB_DATA_ALIGN(IXGBEVF_SKB_PAD + size) +
                SKB_DATA_ALIGN(sizeof(struct skb_shared_info)) :
                SKB_DATA_ALIGN(size);
#endif
        return truesize;
}

static void ixgbevf_rx_buffer_flip(struct ixgbevf_ring *rx_ring,
                                   struct ixgbevf_rx_buffer *rx_buffer,
                                   unsigned int size)
{
        unsigned int truesize = ixgbevf_rx_frame_truesize(rx_ring, size);

#if (PAGE_SIZE < 8192)
        rx_buffer->page_offset ^= truesize;
#else
        rx_buffer->page_offset += truesize;
#endif
}

static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
                                struct ixgbevf_ring *rx_ring,
                                int budget)
{
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        u16 cleaned_count = ixgbevf_desc_unused(rx_ring);
        struct sk_buff *skb = rx_ring->skb;
        bool xdp_xmit = false;
        struct xdp_buff xdp;

        xdp.rxq = &rx_ring->xdp_rxq;

        /* Frame size depend on rx_ring setup when PAGE_SIZE=4K */
#if (PAGE_SIZE < 8192)
        xdp.frame_sz = ixgbevf_rx_frame_truesize(rx_ring, 0);
#endif

        while (likely(total_rx_packets < budget)) {
                struct ixgbevf_rx_buffer *rx_buffer;
                union ixgbe_adv_rx_desc *rx_desc;
                unsigned int size;

                /* return some buffers to hardware, one at a time is too slow */
                if (cleaned_count >= IXGBEVF_RX_BUFFER_WRITE) {
                        ixgbevf_alloc_rx_buffers(rx_ring, cleaned_count);
                        cleaned_count = 0;
                }

                rx_desc = IXGBEVF_RX_DESC(rx_ring, rx_ring->next_to_clean);
                size = le16_to_cpu(rx_desc->wb.upper.length);
                if (!size)
                        break;

                /* This memory barrier is needed to keep us from reading
                 * any other fields out of the rx_desc until we know the
                 * RXD_STAT_DD bit is set
                 */
                rmb();

                rx_buffer = ixgbevf_get_rx_buffer(rx_ring, size);

                /* retrieve a buffer from the ring */
                if (!skb) {
                        xdp.data = page_address(rx_buffer->page) +
                                   rx_buffer->page_offset;
                        xdp.data_meta = xdp.data;
                        xdp.data_hard_start = xdp.data -
                                              ixgbevf_rx_offset(rx_ring);
                        xdp.data_end = xdp.data + size;
#if (PAGE_SIZE > 4096)
                        /* At larger PAGE_SIZE, frame_sz depend on len size */
                        xdp.frame_sz = ixgbevf_rx_frame_truesize(rx_ring, size);
#endif
                        skb = ixgbevf_run_xdp(adapter, rx_ring, &xdp);
                }

                if (IS_ERR(skb)) {
                        if (PTR_ERR(skb) == -IXGBEVF_XDP_TX) {
                                xdp_xmit = true;
                                ixgbevf_rx_buffer_flip(rx_ring, rx_buffer,
                                                       size);
                        } else {
                                rx_buffer->pagecnt_bias++;
                        }
                        total_rx_packets++;
                        total_rx_bytes += size;
                } else if (skb) {
                        ixgbevf_add_rx_frag(rx_ring, rx_buffer, skb, size);
                } else if (ring_uses_build_skb(rx_ring)) {
                        skb = ixgbevf_build_skb(rx_ring, rx_buffer,
                                                &xdp, rx_desc);
                } else {
                        skb = ixgbevf_construct_skb(rx_ring, rx_buffer,
                                                    &xdp, rx_desc);
                }

                /* exit if we failed to retrieve a buffer */
                if (!skb) {
                        rx_ring->rx_stats.alloc_rx_buff_failed++;
                        rx_buffer->pagecnt_bias++;
                        break;
                }

                ixgbevf_put_rx_buffer(rx_ring, rx_buffer, skb);
                cleaned_count++;

                /* fetch next buffer in frame if non-eop */
                if (ixgbevf_is_non_eop(rx_ring, rx_desc))
                        continue;

                /* verify the packet layout is correct */
                if (ixgbevf_cleanup_headers(rx_ring, rx_desc, skb)) {
                        skb = NULL;
                        continue;
                }

                /* probably a little skewed due to removing CRC */
                total_rx_bytes += skb->len;

                /* Workaround hardware that can't do proper VEPA multicast
                 * source pruning.
                 */
                if ((skb->pkt_type == PACKET_BROADCAST ||
                     skb->pkt_type == PACKET_MULTICAST) &&
                    ether_addr_equal(rx_ring->netdev->dev_addr,
                                     eth_hdr(skb)->h_source)) {
                        dev_kfree_skb_irq(skb);
                        continue;
                }

                /* populate checksum, VLAN, and protocol */
                ixgbevf_process_skb_fields(rx_ring, rx_desc, skb);

                ixgbevf_rx_skb(q_vector, skb);

                /* reset skb pointer */
                skb = NULL;

                /* update budget accounting */
                total_rx_packets++;
        }

        /* place incomplete frames back on ring for completion */
        rx_ring->skb = skb;

        if (xdp_xmit) {
                struct ixgbevf_ring *xdp_ring =
                        adapter->xdp_ring[rx_ring->queue_index];

                /* Force memory writes to complete before letting h/w
                 * know there are new descriptors to fetch.
                 */
                wmb();
                ixgbevf_write_tail(xdp_ring, xdp_ring->next_to_use);
        }

        u64_stats_update_begin(&rx_ring->syncp);
        rx_ring->stats.packets += total_rx_packets;
        rx_ring->stats.bytes += total_rx_bytes;
        u64_stats_update_end(&rx_ring->syncp);
        q_vector->rx.total_packets += total_rx_packets;
        q_vector->rx.total_bytes += total_rx_bytes;

        return total_rx_packets;
}

/**
 * ixgbevf_poll - NAPI polling calback
 * @napi: napi struct with our devices info in it
 * @budget: amount of work driver is allowed to do this pass, in packets
 *
 * This function will clean more than one or more rings associated with a
 * q_vector.
 **/
static int ixgbevf_poll(struct napi_struct *napi, int budget)
{
        struct ixgbevf_q_vector *q_vector =
                container_of(napi, struct ixgbevf_q_vector, napi);
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        struct ixgbevf_ring *ring;
        int per_ring_budget, work_done = 0;
        bool clean_complete = true;

        ixgbevf_for_each_ring(ring, q_vector->tx) {
                if (!ixgbevf_clean_tx_irq(q_vector, ring, budget))
                        clean_complete = false;
        }

        if (budget <= 0)
                return budget;

        /* attempt to distribute budget to each queue fairly, but don't allow
         * the budget to go below 1 because we'll exit polling
         */
        if (q_vector->rx.count > 1)
                per_ring_budget = max(budget/q_vector->rx.count, 1);
        else
                per_ring_budget = budget;

        ixgbevf_for_each_ring(ring, q_vector->rx) {
                int cleaned = ixgbevf_clean_rx_irq(q_vector, ring,
                                                   per_ring_budget);
                work_done += cleaned;
                if (cleaned >= per_ring_budget)
                        clean_complete = false;
        }

        /* If all work not completed, return budget and keep polling */
        if (!clean_complete)
                return budget;

        /* Exit the polling mode, but don't re-enable interrupts if stack might
         * poll us due to busy-polling
         */
        if (likely(napi_complete_done(napi, work_done))) {
                if (adapter->rx_itr_setting == 1)
                        ixgbevf_set_itr(q_vector);
                if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
                    !test_bit(__IXGBEVF_REMOVING, &adapter->state))
                        ixgbevf_irq_enable_queues(adapter,
                                                  BIT(q_vector->v_idx));
        }

        return min(work_done, budget - 1);
}

/**
 * ixgbevf_write_eitr - write VTEITR register in hardware specific way
 * @q_vector: structure containing interrupt and ring information
 **/
void ixgbevf_write_eitr(struct ixgbevf_q_vector *q_vector)
{
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        struct ixgbe_hw *hw = &adapter->hw;
        int v_idx = q_vector->v_idx;
        u32 itr_reg = q_vector->itr & IXGBE_MAX_EITR;

        /* set the WDIS bit to not clear the timer bits and cause an
         * immediate assertion of the interrupt
         */
        itr_reg |= IXGBE_EITR_CNT_WDIS;

        IXGBE_WRITE_REG(hw, IXGBE_VTEITR(v_idx), itr_reg);
}

/**
 * ixgbevf_configure_msix - Configure MSI-X hardware
 * @adapter: board private structure
 *
 * ixgbevf_configure_msix sets up the hardware to properly generate MSI-X
 * interrupts.
 **/
static void ixgbevf_configure_msix(struct ixgbevf_adapter *adapter)
{
        struct ixgbevf_q_vector *q_vector;
        int q_vectors, v_idx;

        q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
        adapter->eims_enable_mask = 0;

        /* Populate the IVAR table and set the ITR values to the
         * corresponding register.
         */
        for (v_idx = 0; v_idx < q_vectors; v_idx++) {
                struct ixgbevf_ring *ring;

                q_vector = adapter->q_vector[v_idx];

                ixgbevf_for_each_ring(ring, q_vector->rx)
                        ixgbevf_set_ivar(adapter, 0, ring->reg_idx, v_idx);

                ixgbevf_for_each_ring(ring, q_vector->tx)
                        ixgbevf_set_ivar(adapter, 1, ring->reg_idx, v_idx);

                if (q_vector->tx.ring && !q_vector->rx.ring) {
                        /* Tx only vector */
                        if (adapter->tx_itr_setting == 1)
                                q_vector->itr = IXGBE_12K_ITR;
                        else
                                q_vector->itr = adapter->tx_itr_setting;
                } else {
                        /* Rx or Rx/Tx vector */
                        if (adapter->rx_itr_setting == 1)
                                q_vector->itr = IXGBE_20K_ITR;
                        else
                                q_vector->itr = adapter->rx_itr_setting;
                }

                /* add q_vector eims value to global eims_enable_mask */
                adapter->eims_enable_mask |= BIT(v_idx);

                ixgbevf_write_eitr(q_vector);
        }

        ixgbevf_set_ivar(adapter, -1, 1, v_idx);
        /* setup eims_other and add value to global eims_enable_mask */
        adapter->eims_other = BIT(v_idx);
        adapter->eims_enable_mask |= adapter->eims_other;
}

enum latency_range {
        lowest_latency = 0,
        low_latency = 1,
        bulk_latency = 2,
        latency_invalid = 255
};

/**
 * ixgbevf_update_itr - update the dynamic ITR value based on statistics
 * @q_vector: structure containing interrupt and ring information
 * @ring_container: structure containing ring performance data
 *
 * Stores a new ITR value based on packets and byte
 * counts during the last interrupt.  The advantage of per interrupt
 * computation is faster updates and more accurate ITR for the current
 * traffic pattern.  Constants in this function were computed
 * based on theoretical maximum wire speed and thresholds were set based
 * on testing data as well as attempting to minimize response time
 * while increasing bulk throughput.
 **/
static void ixgbevf_update_itr(struct ixgbevf_q_vector *q_vector,
                               struct ixgbevf_ring_container *ring_container)
{
        int bytes = ring_container->total_bytes;
        int packets = ring_container->total_packets;
        u32 timepassed_us;
        u64 bytes_perint;
        u8 itr_setting = ring_container->itr;

        if (packets == 0)
                return;

        /* simple throttle rate management
         *    0-20MB/s lowest (100000 ints/s)
         *   20-100MB/s low   (20000 ints/s)
         *  100-1249MB/s bulk (12000 ints/s)
         */
        /* what was last interrupt timeslice? */
        timepassed_us = q_vector->itr >> 2;
        if (timepassed_us == 0)
                return;

        bytes_perint = bytes / timepassed_us; /* bytes/usec */

        switch (itr_setting) {
        case lowest_latency:
                if (bytes_perint > 10)
                        itr_setting = low_latency;
                break;
        case low_latency:
                if (bytes_perint > 20)
                        itr_setting = bulk_latency;
                else if (bytes_perint <= 10)
                        itr_setting = lowest_latency;
                break;
        case bulk_latency:
                if (bytes_perint <= 20)
                        itr_setting = low_latency;
                break;
        }

        /* clear work counters since we have the values we need */
        ring_container->total_bytes = 0;
        ring_container->total_packets = 0;

        /* write updated itr to ring container */
        ring_container->itr = itr_setting;
}

static void ixgbevf_set_itr(struct ixgbevf_q_vector *q_vector)
{
        u32 new_itr = q_vector->itr;
        u8 current_itr;

        ixgbevf_update_itr(q_vector, &q_vector->tx);
        ixgbevf_update_itr(q_vector, &q_vector->rx);

        current_itr = max(q_vector->rx.itr, q_vector->tx.itr);

        switch (current_itr) {
        /* counts and packets in update_itr are dependent on these numbers */
        case lowest_latency:
                new_itr = IXGBE_100K_ITR;
                break;
        case low_latency:
                new_itr = IXGBE_20K_ITR;
                break;
        case bulk_latency:
                new_itr = IXGBE_12K_ITR;
                break;
        default:
                break;
        }

        if (new_itr != q_vector->itr) {
                /* do an exponential smoothing */
                new_itr = (10 * new_itr * q_vector->itr) /
                          ((9 * new_itr) + q_vector->itr);

                /* save the algorithm value here */
                q_vector->itr = new_itr;

                ixgbevf_write_eitr(q_vector);
        }
}

static irqreturn_t ixgbevf_msix_other(int irq, void *data)
{
        struct ixgbevf_adapter *adapter = data;
        struct ixgbe_hw *hw = &adapter->hw;

        hw->mac.get_link_status = 1;

        ixgbevf_service_event_schedule(adapter);

        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, adapter->eims_other);

        return IRQ_HANDLED;
}

/**
 * ixgbevf_msix_clean_rings - single unshared vector rx clean (all queues)
 * @irq: unused
 * @data: pointer to our q_vector struct for this interrupt vector
 **/
static irqreturn_t ixgbevf_msix_clean_rings(int irq, void *data)
{
        struct ixgbevf_q_vector *q_vector = data;

        /* EIAM disabled interrupts (on this vector) for us */
        if (q_vector->rx.ring || q_vector->tx.ring)
                napi_schedule_irqoff(&q_vector->napi);

        return IRQ_HANDLED;
}

/**
 * ixgbevf_request_msix_irqs - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * ixgbevf_request_msix_irqs allocates MSI-X vectors and requests
 * interrupts from the kernel.
 **/
static int ixgbevf_request_msix_irqs(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
        unsigned int ri = 0, ti = 0;
        int vector, err;

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

                if (q_vector->tx.ring && q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-TxRx-%u", netdev->name, ri++);
                        ti++;
                } else if (q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-rx-%u", netdev->name, ri++);
                } else if (q_vector->tx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name),
                                 "%s-tx-%u", netdev->name, ti++);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }
                err = request_irq(entry->vector, &ixgbevf_msix_clean_rings, 0,
                                  q_vector->name, q_vector);
                if (err) {
                        hw_dbg(&adapter->hw,
                               "request_irq failed for MSIX interrupt Error: %d\n",
                               err);
                        goto free_queue_irqs;
                }
        }

        err = request_irq(adapter->msix_entries[vector].vector,
                          &ixgbevf_msix_other, 0, netdev->name, adapter);
        if (err) {
                hw_dbg(&adapter->hw, "request_irq for msix_other failed: %d\n",
                       err);
                goto free_queue_irqs;
        }

        return 0;

free_queue_irqs:
        while (vector) {
                vector--;
                free_irq(adapter->msix_entries[vector].vector,
                         adapter->q_vector[vector]);
        }
        /* This failure is non-recoverable - it indicates the system is
         * out of MSIX vector resources and the VF driver cannot run
         * without them.  Set the number of msix vectors to zero
         * indicating that not enough can be allocated.  The error
         * will be returned to the user indicating device open failed.
         * Any further attempts to force the driver to open will also
         * fail.  The only way to recover is to unload the driver and
         * reload it again.  If the system has recovered some MSIX
         * vectors then it may succeed.
         */
        adapter->num_msix_vectors = 0;
        return err;
}

/**
 * ixgbevf_request_irq - initialize interrupts
 * @adapter: board private structure
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int ixgbevf_request_irq(struct ixgbevf_adapter *adapter)
{
        int err = ixgbevf_request_msix_irqs(adapter);

        if (err)
                hw_dbg(&adapter->hw, "request_irq failed, Error %d\n", err);

        return err;
}

static void ixgbevf_free_irq(struct ixgbevf_adapter *adapter)
{
        int i, q_vectors;

        if (!adapter->msix_entries)
                return;

        q_vectors = adapter->num_msix_vectors;
        i = q_vectors - 1;

        free_irq(adapter->msix_entries[i].vector, adapter);
        i--;

        for (; i >= 0; i--) {
                /* free only the irqs that were actually requested */
                if (!adapter->q_vector[i]->rx.ring &&
                    !adapter->q_vector[i]->tx.ring)
                        continue;

                free_irq(adapter->msix_entries[i].vector,
                         adapter->q_vector[i]);
        }
}

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

        IXGBE_WRITE_REG(hw, IXGBE_VTEIAM, 0);
        IXGBE_WRITE_REG(hw, IXGBE_VTEIMC, ~0);
        IXGBE_WRITE_REG(hw, IXGBE_VTEIAC, 0);

        IXGBE_WRITE_FLUSH(hw);

        for (i = 0; i < adapter->num_msix_vectors; i++)
                synchronize_irq(adapter->msix_entries[i].vector);
}

/**
 * ixgbevf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static inline void ixgbevf_irq_enable(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;

        IXGBE_WRITE_REG(hw, IXGBE_VTEIAM, adapter->eims_enable_mask);
        IXGBE_WRITE_REG(hw, IXGBE_VTEIAC, adapter->eims_enable_mask);
        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, adapter->eims_enable_mask);
}

/**
 * ixgbevf_configure_tx_ring - Configure 82599 VF Tx ring after Reset
 * @adapter: board private structure
 * @ring: structure containing ring specific data
 *
 * Configure the Tx descriptor ring after a reset.
 **/
static void ixgbevf_configure_tx_ring(struct ixgbevf_adapter *adapter,
                                      struct ixgbevf_ring *ring)
{
        struct ixgbe_hw *hw = &adapter->hw;
        u64 tdba = ring->dma;
        int wait_loop = 10;
        u32 txdctl = IXGBE_TXDCTL_ENABLE;
        u8 reg_idx = ring->reg_idx;

        /* disable queue to avoid issues while updating state */
        IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(reg_idx), IXGBE_TXDCTL_SWFLSH);
        IXGBE_WRITE_FLUSH(hw);

        IXGBE_WRITE_REG(hw, IXGBE_VFTDBAL(reg_idx), tdba & DMA_BIT_MASK(32));
        IXGBE_WRITE_REG(hw, IXGBE_VFTDBAH(reg_idx), tdba >> 32);
        IXGBE_WRITE_REG(hw, IXGBE_VFTDLEN(reg_idx),
                        ring->count * sizeof(union ixgbe_adv_tx_desc));

        /* disable head writeback */
        IXGBE_WRITE_REG(hw, IXGBE_VFTDWBAH(reg_idx), 0);
        IXGBE_WRITE_REG(hw, IXGBE_VFTDWBAL(reg_idx), 0);

        /* enable relaxed ordering */
        IXGBE_WRITE_REG(hw, IXGBE_VFDCA_TXCTRL(reg_idx),
                        (IXGBE_DCA_TXCTRL_DESC_RRO_EN |
                         IXGBE_DCA_TXCTRL_DATA_RRO_EN));

        /* reset head and tail pointers */
        IXGBE_WRITE_REG(hw, IXGBE_VFTDH(reg_idx), 0);
        IXGBE_WRITE_REG(hw, IXGBE_VFTDT(reg_idx), 0);
        ring->tail = adapter->io_addr + IXGBE_VFTDT(reg_idx);

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

        /* In order to avoid issues WTHRESH + PTHRESH should always be equal
         * to or less than the number of on chip descriptors, which is
         * currently 40.
         */
        txdctl |= (8 << 16);    /* WTHRESH = 8 */

        /* Setting PTHRESH to 32 both improves performance */
        txdctl |= (1u << 8) |    /* HTHRESH = 1 */
                   32;           /* PTHRESH = 32 */

        /* reinitialize tx_buffer_info */
        memset(ring->tx_buffer_info, 0,
               sizeof(struct ixgbevf_tx_buffer) * ring->count);

        clear_bit(__IXGBEVF_HANG_CHECK_ARMED, &ring->state);
        clear_bit(__IXGBEVF_TX_XDP_RING_PRIMED, &ring->state);

        IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(reg_idx), txdctl);

        /* poll to verify queue is enabled */
        do {
                usleep_range(1000, 2000);
                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(reg_idx));
        }  while (--wait_loop && !(txdctl & IXGBE_TXDCTL_ENABLE));
        if (!wait_loop)
                hw_dbg(hw, "Could not enable Tx Queue %d\n", reg_idx);
}

/**
 * ixgbevf_configure_tx - Configure 82599 VF Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void ixgbevf_configure_tx(struct ixgbevf_adapter *adapter)
{
        u32 i;

        /* Setup the HW Tx Head and Tail descriptor pointers */
        for (i = 0; i < adapter->num_tx_queues; i++)
                ixgbevf_configure_tx_ring(adapter, adapter->tx_ring[i]);
        for (i = 0; i < adapter->num_xdp_queues; i++)
                ixgbevf_configure_tx_ring(adapter, adapter->xdp_ring[i]);
}

#define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2

static void ixgbevf_configure_srrctl(struct ixgbevf_adapter *adapter,
                                     struct ixgbevf_ring *ring, int index)
{
        struct ixgbe_hw *hw = &adapter->hw;
        u32 srrctl;

        srrctl = IXGBE_SRRCTL_DROP_EN;

        srrctl |= IXGBEVF_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
        if (ring_uses_large_buffer(ring))
                srrctl |= IXGBEVF_RXBUFFER_3072 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
        else
                srrctl |= IXGBEVF_RXBUFFER_2048 >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
        srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;

        IXGBE_WRITE_REG(hw, IXGBE_VFSRRCTL(index), srrctl);
}

static void ixgbevf_setup_psrtype(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;

        /* PSRTYPE must be initialized in 82599 */
        u32 psrtype = IXGBE_PSRTYPE_TCPHDR | IXGBE_PSRTYPE_UDPHDR |
                      IXGBE_PSRTYPE_IPV4HDR | IXGBE_PSRTYPE_IPV6HDR |
                      IXGBE_PSRTYPE_L2HDR;

        if (adapter->num_rx_queues > 1)
                psrtype |= BIT(29);

        IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, psrtype);
}

#define IXGBEVF_MAX_RX_DESC_POLL 10
static void ixgbevf_disable_rx_queue(struct ixgbevf_adapter *adapter,
                                     struct ixgbevf_ring *ring)
{
        struct ixgbe_hw *hw = &adapter->hw;
        int wait_loop = IXGBEVF_MAX_RX_DESC_POLL;
        u32 rxdctl;
        u8 reg_idx = ring->reg_idx;

        if (IXGBE_REMOVED(hw->hw_addr))
                return;
        rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(reg_idx));
        rxdctl &= ~IXGBE_RXDCTL_ENABLE;

        /* write value back with RXDCTL.ENABLE bit cleared */
        IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(reg_idx), rxdctl);

        /* the hardware may take up to 100us to really disable the Rx queue */
        do {
                udelay(10);
                rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(reg_idx));
        } while (--wait_loop && (rxdctl & IXGBE_RXDCTL_ENABLE));

        if (!wait_loop)
                pr_err("RXDCTL.ENABLE queue %d not cleared while polling\n",
                       reg_idx);
}

static void ixgbevf_rx_desc_queue_enable(struct ixgbevf_adapter *adapter,
                                         struct ixgbevf_ring *ring)
{
        struct ixgbe_hw *hw = &adapter->hw;
        int wait_loop = IXGBEVF_MAX_RX_DESC_POLL;
        u32 rxdctl;
        u8 reg_idx = ring->reg_idx;

        if (IXGBE_REMOVED(hw->hw_addr))
                return;
        do {
                usleep_range(1000, 2000);
                rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(reg_idx));
        } while (--wait_loop && !(rxdctl & IXGBE_RXDCTL_ENABLE));

        if (!wait_loop)
                pr_err("RXDCTL.ENABLE queue %d not set while polling\n",
                       reg_idx);
}

/**
 * ixgbevf_init_rss_key - Initialize adapter RSS key
 * @adapter: device handle
 *
 * Allocates and initializes the RSS key if it is not allocated.
 **/
static inline int ixgbevf_init_rss_key(struct ixgbevf_adapter *adapter)
{
        u32 *rss_key;

        if (!adapter->rss_key) {
                rss_key = kzalloc(IXGBEVF_RSS_HASH_KEY_SIZE, GFP_KERNEL);
                if (unlikely(!rss_key))
                        return -ENOMEM;

                netdev_rss_key_fill(rss_key, IXGBEVF_RSS_HASH_KEY_SIZE);
                adapter->rss_key = rss_key;
        }

        return 0;
}

static void ixgbevf_setup_vfmrqc(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        u32 vfmrqc = 0, vfreta = 0;
        u16 rss_i = adapter->num_rx_queues;
        u8 i, j;

        /* Fill out hash function seeds */
        for (i = 0; i < IXGBEVF_VFRSSRK_REGS; i++)
                IXGBE_WRITE_REG(hw, IXGBE_VFRSSRK(i), *(adapter->rss_key + i));

        for (i = 0, j = 0; i < IXGBEVF_X550_VFRETA_SIZE; i++, j++) {
                if (j == rss_i)
                        j = 0;

                adapter->rss_indir_tbl[i] = j;

                vfreta |= j << (i & 0x3) * 8;
                if ((i & 3) == 3) {
                        IXGBE_WRITE_REG(hw, IXGBE_VFRETA(i >> 2), vfreta);
                        vfreta = 0;
                }
        }

        /* Perform hash on these packet types */
        vfmrqc |= IXGBE_VFMRQC_RSS_FIELD_IPV4 |
                IXGBE_VFMRQC_RSS_FIELD_IPV4_TCP |
                IXGBE_VFMRQC_RSS_FIELD_IPV6 |
                IXGBE_VFMRQC_RSS_FIELD_IPV6_TCP;

        vfmrqc |= IXGBE_VFMRQC_RSSEN;

        IXGBE_WRITE_REG(hw, IXGBE_VFMRQC, vfmrqc);
}

static void ixgbevf_configure_rx_ring(struct ixgbevf_adapter *adapter,
                                      struct ixgbevf_ring *ring)
{
        struct ixgbe_hw *hw = &adapter->hw;
        union ixgbe_adv_rx_desc *rx_desc;
        u64 rdba = ring->dma;
        u32 rxdctl;
        u8 reg_idx = ring->reg_idx;

        /* disable queue to avoid issues while updating state */
        rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(reg_idx));
        ixgbevf_disable_rx_queue(adapter, ring);

        IXGBE_WRITE_REG(hw, IXGBE_VFRDBAL(reg_idx), rdba & DMA_BIT_MASK(32));
        IXGBE_WRITE_REG(hw, IXGBE_VFRDBAH(reg_idx), rdba >> 32);
        IXGBE_WRITE_REG(hw, IXGBE_VFRDLEN(reg_idx),
                        ring->count * sizeof(union ixgbe_adv_rx_desc));

#ifndef CONFIG_SPARC
        /* enable relaxed ordering */
        IXGBE_WRITE_REG(hw, IXGBE_VFDCA_RXCTRL(reg_idx),
                        IXGBE_DCA_RXCTRL_DESC_RRO_EN);
#else
        IXGBE_WRITE_REG(hw, IXGBE_VFDCA_RXCTRL(reg_idx),
                        IXGBE_DCA_RXCTRL_DESC_RRO_EN |
                        IXGBE_DCA_RXCTRL_DATA_WRO_EN);
#endif

        /* reset head and tail pointers */
        IXGBE_WRITE_REG(hw, IXGBE_VFRDH(reg_idx), 0);
        IXGBE_WRITE_REG(hw, IXGBE_VFRDT(reg_idx), 0);
        ring->tail = adapter->io_addr + IXGBE_VFRDT(reg_idx);

        /* initialize rx_buffer_info */
        memset(ring->rx_buffer_info, 0,
               sizeof(struct ixgbevf_rx_buffer) * ring->count);

        /* initialize Rx descriptor 0 */
        rx_desc = IXGBEVF_RX_DESC(ring, 0);
        rx_desc->wb.upper.length = 0;

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

        ixgbevf_configure_srrctl(adapter, ring, reg_idx);

        /* RXDCTL.RLPML does not work on 82599 */
        if (adapter->hw.mac.type != ixgbe_mac_82599_vf) {
                rxdctl &= ~(IXGBE_RXDCTL_RLPMLMASK |
                            IXGBE_RXDCTL_RLPML_EN);

#if (PAGE_SIZE < 8192)
                /* Limit the maximum frame size so we don't overrun the skb */
                if (ring_uses_build_skb(ring) &&
                    !ring_uses_large_buffer(ring))
                        rxdctl |= IXGBEVF_MAX_FRAME_BUILD_SKB |
                                  IXGBE_RXDCTL_RLPML_EN;
#endif
        }

        rxdctl |= IXGBE_RXDCTL_ENABLE | IXGBE_RXDCTL_VME;
        IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(reg_idx), rxdctl);

        ixgbevf_rx_desc_queue_enable(adapter, ring);
        ixgbevf_alloc_rx_buffers(ring, ixgbevf_desc_unused(ring));
}

static void ixgbevf_set_rx_buffer_len(struct ixgbevf_adapter *adapter,
                                      struct ixgbevf_ring *rx_ring)
{
        struct net_device *netdev = adapter->netdev;
        unsigned int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;

        /* set build_skb and buffer size flags */
        clear_ring_build_skb_enabled(rx_ring);
        clear_ring_uses_large_buffer(rx_ring);

        if (adapter->flags & IXGBEVF_FLAGS_LEGACY_RX)
                return;

        set_ring_build_skb_enabled(rx_ring);

        if (PAGE_SIZE < 8192) {
                if (max_frame <= IXGBEVF_MAX_FRAME_BUILD_SKB)
                        return;

                set_ring_uses_large_buffer(rx_ring);
        }
}

/**
 * ixgbevf_configure_rx - Configure 82599 VF Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void ixgbevf_configure_rx(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        int i, ret;

        ixgbevf_setup_psrtype(adapter);
        if (hw->mac.type >= ixgbe_mac_X550_vf)
                ixgbevf_setup_vfmrqc(adapter);

        spin_lock_bh(&adapter->mbx_lock);
        /* notify the PF of our intent to use this size of frame */
        ret = hw->mac.ops.set_rlpml(hw, netdev->mtu + ETH_HLEN + ETH_FCS_LEN);
        spin_unlock_bh(&adapter->mbx_lock);
        if (ret)
                dev_err(&adapter->pdev->dev,
                        "Failed to set MTU at %d\n", netdev->mtu);

        /* Setup the HW Rx Head and Tail Descriptor Pointers and
         * the Base and Length of the Rx Descriptor Ring
         */
        for (i = 0; i < adapter->num_rx_queues; i++) {
                struct ixgbevf_ring *rx_ring = adapter->rx_ring[i];

                ixgbevf_set_rx_buffer_len(adapter, rx_ring);
                ixgbevf_configure_rx_ring(adapter, rx_ring);
        }
}

static int ixgbevf_vlan_rx_add_vid(struct net_device *netdev,
                                   __be16 proto, u16 vid)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        int err;

        spin_lock_bh(&adapter->mbx_lock);

        /* add VID to filter table */
        err = hw->mac.ops.set_vfta(hw, vid, 0, true);

        spin_unlock_bh(&adapter->mbx_lock);

        /* translate error return types so error makes sense */
        if (err == IXGBE_ERR_MBX)
                return -EIO;

        if (err == IXGBE_ERR_INVALID_ARGUMENT)
                return -EACCES;

        set_bit(vid, adapter->active_vlans);

        return err;
}

static int ixgbevf_vlan_rx_kill_vid(struct net_device *netdev,
                                    __be16 proto, u16 vid)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        int err;

        spin_lock_bh(&adapter->mbx_lock);

        /* remove VID from filter table */
        err = hw->mac.ops.set_vfta(hw, vid, 0, false);

        spin_unlock_bh(&adapter->mbx_lock);

        clear_bit(vid, adapter->active_vlans);

        return err;
}

static void ixgbevf_restore_vlan(struct ixgbevf_adapter *adapter)
{
        u16 vid;

        for_each_set_bit(vid, adapter->active_vlans, VLAN_N_VID)
                ixgbevf_vlan_rx_add_vid(adapter->netdev,
                                        htons(ETH_P_8021Q), vid);
}

static int ixgbevf_write_uc_addr_list(struct net_device *netdev)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        int count = 0;

        if (!netdev_uc_empty(netdev)) {
                struct netdev_hw_addr *ha;

                netdev_for_each_uc_addr(ha, netdev) {
                        hw->mac.ops.set_uc_addr(hw, ++count, ha->addr);
                        udelay(200);
                }
        } else {
                /* If the list is empty then send message to PF driver to
                 * clear all MAC VLANs on this VF.
                 */
                hw->mac.ops.set_uc_addr(hw, 0, NULL);
        }

        return count;
}

/**
 * ixgbevf_set_rx_mode - Multicast and unicast set
 * @netdev: network interface device structure
 *
 * The set_rx_method entry point is called whenever the multicast address
 * list, unicast address list or the network interface flags are updated.
 * This routine is responsible for configuring the hardware for proper
 * multicast mode and configuring requested unicast filters.
 **/
static void ixgbevf_set_rx_mode(struct net_device *netdev)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        unsigned int flags = netdev->flags;
        int xcast_mode;

        /* request the most inclusive mode we need */
        if (flags & IFF_PROMISC)
                xcast_mode = IXGBEVF_XCAST_MODE_PROMISC;
        else if (flags & IFF_ALLMULTI)
                xcast_mode = IXGBEVF_XCAST_MODE_ALLMULTI;
        else if (flags & (IFF_BROADCAST | IFF_MULTICAST))
                xcast_mode = IXGBEVF_XCAST_MODE_MULTI;
        else
                xcast_mode = IXGBEVF_XCAST_MODE_NONE;

        spin_lock_bh(&adapter->mbx_lock);

        hw->mac.ops.update_xcast_mode(hw, xcast_mode);

        /* reprogram multicast list */
        hw->mac.ops.update_mc_addr_list(hw, netdev);

        ixgbevf_write_uc_addr_list(netdev);

        spin_unlock_bh(&adapter->mbx_lock);
}

static void ixgbevf_napi_enable_all(struct ixgbevf_adapter *adapter)
{
        int q_idx;
        struct ixgbevf_q_vector *q_vector;
        int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

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

static void ixgbevf_napi_disable_all(struct ixgbevf_adapter *adapter)
{
        int q_idx;
        struct ixgbevf_q_vector *q_vector;
        int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

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

static int ixgbevf_configure_dcb(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        unsigned int def_q = 0;
        unsigned int num_tcs = 0;
        unsigned int num_rx_queues = adapter->num_rx_queues;
        unsigned int num_tx_queues = adapter->num_tx_queues;
        int err;

        spin_lock_bh(&adapter->mbx_lock);

        /* fetch queue configuration from the PF */
        err = ixgbevf_get_queues(hw, &num_tcs, &def_q);

        spin_unlock_bh(&adapter->mbx_lock);

        if (err)
                return err;

        if (num_tcs > 1) {
                /* we need only one Tx queue */
                num_tx_queues = 1;

                /* update default Tx ring register index */
                adapter->tx_ring[0]->reg_idx = def_q;

                /* we need as many queues as traffic classes */
                num_rx_queues = num_tcs;
        }

        /* if we have a bad config abort request queue reset */
        if ((adapter->num_rx_queues != num_rx_queues) ||
            (adapter->num_tx_queues != num_tx_queues)) {
                /* force mailbox timeout to prevent further messages */
                hw->mbx.timeout = 0;

                /* wait for watchdog to come around and bail us out */
                set_bit(__IXGBEVF_QUEUE_RESET_REQUESTED, &adapter->state);
        }

        return 0;
}

static void ixgbevf_configure(struct ixgbevf_adapter *adapter)
{
        ixgbevf_configure_dcb(adapter);

        ixgbevf_set_rx_mode(adapter->netdev);

        ixgbevf_restore_vlan(adapter);
        ixgbevf_ipsec_restore(adapter);

        ixgbevf_configure_tx(adapter);
        ixgbevf_configure_rx(adapter);
}

static void ixgbevf_save_reset_stats(struct ixgbevf_adapter *adapter)
{
        /* Only save pre-reset stats if there are some */
        if (adapter->stats.vfgprc || adapter->stats.vfgptc) {
                adapter->stats.saved_reset_vfgprc += adapter->stats.vfgprc -
                        adapter->stats.base_vfgprc;
                adapter->stats.saved_reset_vfgptc += adapter->stats.vfgptc -
                        adapter->stats.base_vfgptc;
                adapter->stats.saved_reset_vfgorc += adapter->stats.vfgorc -
                        adapter->stats.base_vfgorc;
                adapter->stats.saved_reset_vfgotc += adapter->stats.vfgotc -
                        adapter->stats.base_vfgotc;
                adapter->stats.saved_reset_vfmprc += adapter->stats.vfmprc -
                        adapter->stats.base_vfmprc;
        }
}

static void ixgbevf_init_last_counter_stats(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;

        adapter->stats.last_vfgprc = IXGBE_READ_REG(hw, IXGBE_VFGPRC);
        adapter->stats.last_vfgorc = IXGBE_READ_REG(hw, IXGBE_VFGORC_LSB);
        adapter->stats.last_vfgorc |=
                (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGORC_MSB))) << 32);
        adapter->stats.last_vfgptc = IXGBE_READ_REG(hw, IXGBE_VFGPTC);
        adapter->stats.last_vfgotc = IXGBE_READ_REG(hw, IXGBE_VFGOTC_LSB);
        adapter->stats.last_vfgotc |=
                (((u64)(IXGBE_READ_REG(hw, IXGBE_VFGOTC_MSB))) << 32);
        adapter->stats.last_vfmprc = IXGBE_READ_REG(hw, IXGBE_VFMPRC);

        adapter->stats.base_vfgprc = adapter->stats.last_vfgprc;
        adapter->stats.base_vfgorc = adapter->stats.last_vfgorc;
        adapter->stats.base_vfgptc = adapter->stats.last_vfgptc;
        adapter->stats.base_vfgotc = adapter->stats.last_vfgotc;
        adapter->stats.base_vfmprc = adapter->stats.last_vfmprc;
}

static void ixgbevf_negotiate_api(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        static const int api[] = {
                ixgbe_mbox_api_14,
                ixgbe_mbox_api_13,
                ixgbe_mbox_api_12,
                ixgbe_mbox_api_11,
                ixgbe_mbox_api_10,
                ixgbe_mbox_api_unknown
        };
        int err, idx = 0;

        spin_lock_bh(&adapter->mbx_lock);

        while (api[idx] != ixgbe_mbox_api_unknown) {
                err = hw->mac.ops.negotiate_api_version(hw, api[idx]);
                if (!err)
                        break;
                idx++;
        }

        spin_unlock_bh(&adapter->mbx_lock);
}

static void ixgbevf_up_complete(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;

        ixgbevf_configure_msix(adapter);

        spin_lock_bh(&adapter->mbx_lock);

        if (is_valid_ether_addr(hw->mac.addr))
                hw->mac.ops.set_rar(hw, 0, hw->mac.addr, 0);
        else
                hw->mac.ops.set_rar(hw, 0, hw->mac.perm_addr, 0);

        spin_unlock_bh(&adapter->mbx_lock);

        smp_mb__before_atomic();
        clear_bit(__IXGBEVF_DOWN, &adapter->state);
        ixgbevf_napi_enable_all(adapter);

        /* clear any pending interrupts, may auto mask */
        IXGBE_READ_REG(hw, IXGBE_VTEICR);
        ixgbevf_irq_enable(adapter);

        /* enable transmits */
        netif_tx_start_all_queues(netdev);

        ixgbevf_save_reset_stats(adapter);
        ixgbevf_init_last_counter_stats(adapter);

        hw->mac.get_link_status = 1;
        mod_timer(&adapter->service_timer, jiffies);
}

void ixgbevf_up(struct ixgbevf_adapter *adapter)
{
        ixgbevf_configure(adapter);

        ixgbevf_up_complete(adapter);
}

/**
 * ixgbevf_clean_rx_ring - Free Rx Buffers per Queue
 * @rx_ring: ring to free buffers from
 **/
static void ixgbevf_clean_rx_ring(struct ixgbevf_ring *rx_ring)
{
        u16 i = rx_ring->next_to_clean;

        /* Free Rx ring sk_buff */
        if (rx_ring->skb) {
                dev_kfree_skb(rx_ring->skb);
                rx_ring->skb = NULL;
        }

        /* Free all the Rx ring pages */
        while (i != rx_ring->next_to_alloc) {
                struct ixgbevf_rx_buffer *rx_buffer;

                rx_buffer = &rx_ring->rx_buffer_info[i];

                /* Invalidate cache lines that may have been written to by
                 * device so that we avoid corrupting memory.
                 */
                dma_sync_single_range_for_cpu(rx_ring->dev,
                                              rx_buffer->dma,
                                              rx_buffer->page_offset,
                                              ixgbevf_rx_bufsz(rx_ring),
                                              DMA_FROM_DEVICE);

                /* free resources associated with mapping */
                dma_unmap_page_attrs(rx_ring->dev,
                                     rx_buffer->dma,
                                     ixgbevf_rx_pg_size(rx_ring),
                                     DMA_FROM_DEVICE,
                                     IXGBEVF_RX_DMA_ATTR);

                __page_frag_cache_drain(rx_buffer->page,
                                        rx_buffer->pagecnt_bias);

                i++;
                if (i == rx_ring->count)
                        i = 0;
        }

        rx_ring->next_to_alloc = 0;
        rx_ring->next_to_clean = 0;
        rx_ring->next_to_use = 0;
}

/**
 * ixgbevf_clean_tx_ring - Free Tx Buffers
 * @tx_ring: ring to be cleaned
 **/
static void ixgbevf_clean_tx_ring(struct ixgbevf_ring *tx_ring)
{
        u16 i = tx_ring->next_to_clean;
        struct ixgbevf_tx_buffer *tx_buffer = &tx_ring->tx_buffer_info[i];

        while (i != tx_ring->next_to_use) {
                union ixgbe_adv_tx_desc *eop_desc, *tx_desc;

                /* Free all the Tx ring sk_buffs */
                if (ring_is_xdp(tx_ring))
                        page_frag_free(tx_buffer->data);
                else
                        dev_kfree_skb_any(tx_buffer->skb);

                /* unmap skb header data */
                dma_unmap_single(tx_ring->dev,
                                 dma_unmap_addr(tx_buffer, dma),
                                 dma_unmap_len(tx_buffer, len),
                                 DMA_TO_DEVICE);

                /* check for eop_desc to determine the end of the packet */
                eop_desc = tx_buffer->next_to_watch;
                tx_desc = IXGBEVF_TX_DESC(tx_ring, i);

                /* unmap remaining buffers */
                while (tx_desc != eop_desc) {
                        tx_buffer++;
                        tx_desc++;
                        i++;
                        if (unlikely(i == tx_ring->count)) {
                                i = 0;
                                tx_buffer = tx_ring->tx_buffer_info;
                                tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
                        }

                        /* unmap any remaining paged data */
                        if (dma_unmap_len(tx_buffer, len))
                                dma_unmap_page(tx_ring->dev,
                                               dma_unmap_addr(tx_buffer, dma),
                                               dma_unmap_len(tx_buffer, len),
                                               DMA_TO_DEVICE);
                }

                /* move us one more past the eop_desc for start of next pkt */
                tx_buffer++;
                i++;
                if (unlikely(i == tx_ring->count)) {
                        i = 0;
                        tx_buffer = tx_ring->tx_buffer_info;
                }
        }

        /* reset next_to_use and next_to_clean */
        tx_ring->next_to_use = 0;
        tx_ring->next_to_clean = 0;

}

/**
 * ixgbevf_clean_all_rx_rings - Free Rx Buffers for all queues
 * @adapter: board private structure
 **/
static void ixgbevf_clean_all_rx_rings(struct ixgbevf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_rx_queues; i++)
                ixgbevf_clean_rx_ring(adapter->rx_ring[i]);
}

/**
 * ixgbevf_clean_all_tx_rings - Free Tx Buffers for all queues
 * @adapter: board private structure
 **/
static void ixgbevf_clean_all_tx_rings(struct ixgbevf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++)
                ixgbevf_clean_tx_ring(adapter->tx_ring[i]);
        for (i = 0; i < adapter->num_xdp_queues; i++)
                ixgbevf_clean_tx_ring(adapter->xdp_ring[i]);
}

void ixgbevf_down(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        int i;

        /* signal that we are down to the interrupt handler */
        if (test_and_set_bit(__IXGBEVF_DOWN, &adapter->state))
                return; /* do nothing if already down */

        /* disable all enabled Rx queues */
        for (i = 0; i < adapter->num_rx_queues; i++)
                ixgbevf_disable_rx_queue(adapter, adapter->rx_ring[i]);

        usleep_range(10000, 20000);

        netif_tx_stop_all_queues(netdev);

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

        ixgbevf_irq_disable(adapter);

        ixgbevf_napi_disable_all(adapter);

        del_timer_sync(&adapter->service_timer);

        /* disable transmits in the hardware now that interrupts are off */
        for (i = 0; i < adapter->num_tx_queues; i++) {
                u8 reg_idx = adapter->tx_ring[i]->reg_idx;

                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(reg_idx),
                                IXGBE_TXDCTL_SWFLSH);
        }

        for (i = 0; i < adapter->num_xdp_queues; i++) {
                u8 reg_idx = adapter->xdp_ring[i]->reg_idx;

                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(reg_idx),
                                IXGBE_TXDCTL_SWFLSH);
        }

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

        ixgbevf_clean_all_tx_rings(adapter);
        ixgbevf_clean_all_rx_rings(adapter);
}

void ixgbevf_reinit_locked(struct ixgbevf_adapter *adapter)
{
        WARN_ON(in_interrupt());

        while (test_and_set_bit(__IXGBEVF_RESETTING, &adapter->state))
                msleep(1);

        ixgbevf_down(adapter);
        pci_set_master(adapter->pdev);
        ixgbevf_up(adapter);

        clear_bit(__IXGBEVF_RESETTING, &adapter->state);
}

void ixgbevf_reset(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;

        if (hw->mac.ops.reset_hw(hw)) {
                hw_dbg(hw, "PF still resetting\n");
        } else {
                hw->mac.ops.init_hw(hw);
                ixgbevf_negotiate_api(adapter);
        }

        if (is_valid_ether_addr(adapter->hw.mac.addr)) {
                ether_addr_copy(netdev->dev_addr, adapter->hw.mac.addr);
                ether_addr_copy(netdev->perm_addr, adapter->hw.mac.addr);
        }

        adapter->last_reset = jiffies;
}

static int ixgbevf_acquire_msix_vectors(struct ixgbevf_adapter *adapter,
                                        int vectors)
{
        int vector_threshold;

        /* We'll want at least 2 (vector_threshold):
         * 1) TxQ[0] + RxQ[0] handler
         * 2) Other (Link Status Change, etc.)
         */
        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.
         */
        vectors = pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
                                        vector_threshold, vectors);

        if (vectors < 0) {
                dev_err(&adapter->pdev->dev,
                        "Unable to allocate MSI-X interrupts\n");
                kfree(adapter->msix_entries);
                adapter->msix_entries = NULL;
                return vectors;
        }

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

        return 0;
}

/**
 * ixgbevf_set_num_queues - Allocate queues for device, feature dependent
 * @adapter: board private structure to initialize
 *
 * This is the top level queue allocation routine.  The order here is very
 * important, starting with the "most" number of features turned on at once,
 * and ending with the smallest set of features.  This way large combinations
 * can be allocated if they're turned on, and smaller combinations are the
 * fall through conditions.
 *
 **/
static void ixgbevf_set_num_queues(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        unsigned int def_q = 0;
        unsigned int num_tcs = 0;
        int err;

        /* Start with base case */
        adapter->num_rx_queues = 1;
        adapter->num_tx_queues = 1;
        adapter->num_xdp_queues = 0;

        spin_lock_bh(&adapter->mbx_lock);

        /* fetch queue configuration from the PF */
        err = ixgbevf_get_queues(hw, &num_tcs, &def_q);

        spin_unlock_bh(&adapter->mbx_lock);

        if (err)
                return;

        /* we need as many queues as traffic classes */
        if (num_tcs > 1) {
                adapter->num_rx_queues = num_tcs;
        } else {
                u16 rss = min_t(u16, num_online_cpus(), IXGBEVF_MAX_RSS_QUEUES);

                switch (hw->api_version) {
                case ixgbe_mbox_api_11:
                case ixgbe_mbox_api_12:
                case ixgbe_mbox_api_13:
                case ixgbe_mbox_api_14:
                        if (adapter->xdp_prog &&
                            hw->mac.max_tx_queues == rss)
                                rss = rss > 3 ? 2 : 1;

                        adapter->num_rx_queues = rss;
                        adapter->num_tx_queues = rss;
                        adapter->num_xdp_queues = adapter->xdp_prog ? rss : 0;
                default:
                        break;
                }
        }
}

/**
 * ixgbevf_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 ixgbevf_set_interrupt_capability(struct ixgbevf_adapter *adapter)
{
        int vector, v_budget;

        /* 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) the same number of vectors as there are CPU's.
         * The default is to use pairs of vectors.
         */
        v_budget = max(adapter->num_rx_queues, adapter->num_tx_queues);
        v_budget = min_t(int, v_budget, num_online_cpus());
        v_budget += NON_Q_VECTORS;

        adapter->msix_entries = kcalloc(v_budget,
                                        sizeof(struct msix_entry), GFP_KERNEL);
        if (!adapter->msix_entries)
                return -ENOMEM;

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

        /* A failure in MSI-X entry allocation isn't fatal, but the VF driver
         * does not support any other modes, so we will simply fail here. Note
         * that we clean up the msix_entries pointer else-where.
         */
        return ixgbevf_acquire_msix_vectors(adapter, v_budget);
}

static void ixgbevf_add_ring(struct ixgbevf_ring *ring,
                             struct ixgbevf_ring_container *head)
{
        ring->next = head->ring;
        head->ring = ring;
        head->count++;
}

/**
 * ixgbevf_alloc_q_vector - Allocate memory for a single interrupt vector
 * @adapter: board private structure to initialize
 * @v_idx: index of vector in adapter struct
 * @txr_count: number of Tx rings for q vector
 * @txr_idx: index of first Tx ring to assign
 * @xdp_count: total number of XDP rings to allocate
 * @xdp_idx: index of first XDP ring to allocate
 * @rxr_count: number of Rx rings for q vector
 * @rxr_idx: index of first Rx ring to assign
 *
 * We allocate one q_vector.  If allocation fails we return -ENOMEM.
 **/
static int ixgbevf_alloc_q_vector(struct ixgbevf_adapter *adapter, int v_idx,
                                  int txr_count, int txr_idx,
                                  int xdp_count, int xdp_idx,
                                  int rxr_count, int rxr_idx)
{
        struct ixgbevf_q_vector *q_vector;
        int reg_idx = txr_idx + xdp_idx;
        struct ixgbevf_ring *ring;
        int ring_count, size;

        ring_count = txr_count + xdp_count + rxr_count;
        size = sizeof(*q_vector) + (sizeof(*ring) * ring_count);

        /* allocate q_vector and rings */
        q_vector = kzalloc(size, GFP_KERNEL);
        if (!q_vector)
                return -ENOMEM;

        /* initialize NAPI */
        netif_napi_add(adapter->netdev, &q_vector->napi, ixgbevf_poll, 64);

        /* tie q_vector and adapter together */
        adapter->q_vector[v_idx] = q_vector;
        q_vector->adapter = adapter;
        q_vector->v_idx = v_idx;

        /* initialize pointer to rings */
        ring = q_vector->ring;

        while (txr_count) {
                /* assign generic ring traits */
                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                /* configure backlink on ring */
                ring->q_vector = q_vector;

                /* update q_vector Tx values */
                ixgbevf_add_ring(ring, &q_vector->tx);

                /* apply Tx specific ring traits */
                ring->count = adapter->tx_ring_count;
                ring->queue_index = txr_idx;
                ring->reg_idx = reg_idx;

                /* assign ring to adapter */
                 adapter->tx_ring[txr_idx] = ring;

                /* update count and index */
                txr_count--;
                txr_idx++;
                reg_idx++;

                /* push pointer to next ring */
                ring++;
        }

        while (xdp_count) {
                /* assign generic ring traits */
                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                /* configure backlink on ring */
                ring->q_vector = q_vector;

                /* update q_vector Tx values */
                ixgbevf_add_ring(ring, &q_vector->tx);

                /* apply Tx specific ring traits */
                ring->count = adapter->tx_ring_count;
                ring->queue_index = xdp_idx;
                ring->reg_idx = reg_idx;
                set_ring_xdp(ring);

                /* assign ring to adapter */
                adapter->xdp_ring[xdp_idx] = ring;

                /* update count and index */
                xdp_count--;
                xdp_idx++;
                reg_idx++;

                /* push pointer to next ring */
                ring++;
        }

        while (rxr_count) {
                /* assign generic ring traits */
                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                /* configure backlink on ring */
                ring->q_vector = q_vector;

                /* update q_vector Rx values */
                ixgbevf_add_ring(ring, &q_vector->rx);

                /* apply Rx specific ring traits */
                ring->count = adapter->rx_ring_count;
                ring->queue_index = rxr_idx;
                ring->reg_idx = rxr_idx;

                /* assign ring to adapter */
                adapter->rx_ring[rxr_idx] = ring;

                /* update count and index */
                rxr_count--;
                rxr_idx++;

                /* push pointer to next ring */
                ring++;
        }

        return 0;
}

/**
 * ixgbevf_free_q_vector - Free memory allocated for specific interrupt vector
 * @adapter: board private structure to initialize
 * @v_idx: index of vector in adapter struct
 *
 * This function frees the memory allocated to the q_vector.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void ixgbevf_free_q_vector(struct ixgbevf_adapter *adapter, int v_idx)
{
        struct ixgbevf_q_vector *q_vector = adapter->q_vector[v_idx];
        struct ixgbevf_ring *ring;

        ixgbevf_for_each_ring(ring, q_vector->tx) {
                if (ring_is_xdp(ring))
                        adapter->xdp_ring[ring->queue_index] = NULL;
                else
                        adapter->tx_ring[ring->queue_index] = NULL;
        }

        ixgbevf_for_each_ring(ring, q_vector->rx)
                adapter->rx_ring[ring->queue_index] = NULL;

        adapter->q_vector[v_idx] = NULL;
        netif_napi_del(&q_vector->napi);

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

/**
 * ixgbevf_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 ixgbevf_alloc_q_vectors(struct ixgbevf_adapter *adapter)
{
        int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
        int rxr_remaining = adapter->num_rx_queues;
        int txr_remaining = adapter->num_tx_queues;
        int xdp_remaining = adapter->num_xdp_queues;
        int rxr_idx = 0, txr_idx = 0, xdp_idx = 0, v_idx = 0;
        int err;

        if (q_vectors >= (rxr_remaining + txr_remaining + xdp_remaining)) {
                for (; rxr_remaining; v_idx++, q_vectors--) {
                        int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors);

                        err = ixgbevf_alloc_q_vector(adapter, v_idx,
                                                     0, 0, 0, 0, rqpv, rxr_idx);
                        if (err)
                                goto err_out;

                        /* update counts and index */
                        rxr_remaining -= rqpv;
                        rxr_idx += rqpv;
                }
        }

        for (; q_vectors; v_idx++, q_vectors--) {
                int rqpv = DIV_ROUND_UP(rxr_remaining, q_vectors);
                int tqpv = DIV_ROUND_UP(txr_remaining, q_vectors);
                int xqpv = DIV_ROUND_UP(xdp_remaining, q_vectors);

                err = ixgbevf_alloc_q_vector(adapter, v_idx,
                                             tqpv, txr_idx,
                                             xqpv, xdp_idx,
                                             rqpv, rxr_idx);

                if (err)
                        goto err_out;

                /* update counts and index */
                rxr_remaining -= rqpv;
                rxr_idx += rqpv;
                txr_remaining -= tqpv;
                txr_idx += tqpv;
                xdp_remaining -= xqpv;
                xdp_idx += xqpv;
        }

        return 0;

err_out:
        while (v_idx) {
                v_idx--;
                ixgbevf_free_q_vector(adapter, v_idx);
        }

        return -ENOMEM;
}

/**
 * ixgbevf_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 ixgbevf_free_q_vectors(struct ixgbevf_adapter *adapter)
{
        int q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

        while (q_vectors) {
                q_vectors--;
                ixgbevf_free_q_vector(adapter, q_vectors);
        }
}

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

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

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

        /* Number of supported queues */
        ixgbevf_set_num_queues(adapter);

        err = ixgbevf_set_interrupt_capability(adapter);
        if (err) {
                hw_dbg(&adapter->hw,
                       "Unable to setup interrupt capabilities\n");
                goto err_set_interrupt;
        }

        err = ixgbevf_alloc_q_vectors(adapter);
        if (err) {
                hw_dbg(&adapter->hw, "Unable to allocate memory for queue vectors\n");
                goto err_alloc_q_vectors;
        }

        hw_dbg(&adapter->hw, "Multiqueue %s: Rx Queue count = %u, Tx Queue count = %u XDP Queue count %u\n",
               (adapter->num_rx_queues > 1) ? "Enabled" : "Disabled",
               adapter->num_rx_queues, adapter->num_tx_queues,
               adapter->num_xdp_queues);

        set_bit(__IXGBEVF_DOWN, &adapter->state);

        return 0;
err_alloc_q_vectors:
        ixgbevf_reset_interrupt_capability(adapter);
err_set_interrupt:
        return err;
}

/**
 * ixgbevf_clear_interrupt_scheme - Clear the current interrupt scheme settings
 * @adapter: board private structure to clear interrupt scheme on
 *
 * We go through and clear interrupt specific resources and reset the structure