/*******************************************************************************

  Intel 82599 Virtual Function driver
  Copyright(c) 1999 - 2018 Intel Corporation.

  This program is free software; you can redistribute it and/or modify it
  under the terms and conditions of the GNU General Public License,
  version 2, as published by the Free Software Foundation.

  This program is distributed in the hope it will be useful, but WITHOUT
  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  more details.

  You should have received a copy of the GNU General Public License along with
  this program; if not, see <http://www.gnu.org/licenses/>.

  The full GNU General Public License is included in this distribution in
  the file called "COPYING".

  Contact Information:
  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497

*******************************************************************************/

/******************************************************************************
 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 "ixgbevf.h"

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

#define DRV_VERSION "4.1.0-k"
const char ixgbevf_driver_version[] = DRV_VERSION;
static char ixgbevf_copyright[] =
        "Copyright (c) 2009 - 2015 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");
MODULE_VERSION(DRV_VERSION);

#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)
{
        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;
        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;

                /* 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;

        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);
        }

        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(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 */
        tx_buffer = &ring->tx_buffer_info[ring->next_to_use];
        tx_buffer->bytecount = len;
        tx_buffer->gso_segs = 1;
        tx_buffer->protocol = 0;

        i = ring->next_to_use;
        tx_desc = IXGBEVF_TX_DESC(ring, i);

        dma_unmap_len_set(tx_buffer, len, len);
        dma_unmap_addr_set(tx_buffer, dma, dma);
        tx_buffer->data = xdp->data;
        tx_desc->read.buffer_addr = cpu_to_le64(dma);

        /* 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->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 void ixgbevf_rx_buffer_flip(struct ixgbevf_ring *rx_ring,
                                   struct ixgbevf_rx_buffer *rx_buffer,
                                   unsigned int size)
{
#if (PAGE_SIZE < 8192)
        unsigned int truesize = ixgbevf_rx_pg_size(rx_ring) / 2;

        rx_buffer->page_offset ^= truesize;
#else
        unsigned int truesize = ring_uses_build_skb(rx_ring) ?
                                SKB_DATA_ALIGN(IXGBEVF_SKB_PAD + size) :
                                SKB_DATA_ALIGN(size);

        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;

        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;

                        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;
        /* all work done, exit the polling mode */
        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 0;
}

/**
 * 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;
        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);

        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_count(netdev)) > 10) {
                pr_err("Too many unicast filters - No Space\n");
                return -ENOSPC;
        }

        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_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;
        int api[] = { 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);
        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
 * fallthrough 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:
                        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
 * to pre-load conditions
 **/
static void ixgbevf_clear_interrupt_scheme(struct ixgbevf_adapter *adapter)
{
        adapter->num_tx_queues = 0;
        adapter->num_xdp_queues = 0;
        adapter->num_rx_queues = 0;

        ixgbevf_free_q_vectors(adapter);
        ixgbevf_reset_interrupt_capability(adapter);
}

/**
 * ixgbevf_sw_init - Initialize general software structures
 * @adapter: board private structure to initialize
 *
 * ixgbevf_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/
static int ixgbevf_sw_init(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        struct net_device *netdev = adapter->netdev;
        int err;

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