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

  Intel 82599 Virtual Function driver
  Copyright(c) 1999 - 2010 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, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

  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
******************************************************************************/
#include <linux/types.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/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/prefetch.h>

#include "ixgbevf.h"

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

#define DRV_VERSION "2.0.0-k2"
const char ixgbevf_driver_version[] = DRV_VERSION;
static char ixgbevf_copyright[] =
        "Copyright (c) 2009 - 2010 Intel Corporation.";

static const struct ixgbevf_info *ixgbevf_info_tbl[] = {
        [board_82599_vf] = &ixgbevf_82599_vf_info,
        [board_X540_vf]  = &ixgbevf_X540_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 struct pci_device_id ixgbevf_pci_tbl[] = {
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF),
        board_82599_vf},
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF),
        board_X540_vf},

        /* required last entry */
        {0, }
};
MODULE_DEVICE_TABLE(pci, ixgbevf_pci_tbl);

MODULE_AUTHOR("Intel Corporation, <linux.nics@intel.com>");
MODULE_DESCRIPTION("Intel(R) 82599 Virtual Function Driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);

#define DEFAULT_DEBUG_LEVEL_SHIFT 3

/* forward decls */
static void ixgbevf_set_itr_msix(struct ixgbevf_q_vector *q_vector);
static void ixgbevf_write_eitr(struct ixgbevf_adapter *adapter, int v_idx,
                               u32 itr_reg);

static inline void ixgbevf_release_rx_desc(struct ixgbe_hw *hw,
                                           struct ixgbevf_ring *rx_ring,
                                           u32 val)
{
        /*
         * 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();
        IXGBE_WRITE_REG(hw, IXGBE_VFRDT(rx_ring->reg_idx), val);
}

/*
 * 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 void ixgbevf_unmap_and_free_tx_resource(struct ixgbevf_adapter *adapter,
                                               struct ixgbevf_tx_buffer
                                               *tx_buffer_info)
{
        if (tx_buffer_info->dma) {
                if (tx_buffer_info->mapped_as_page)
                        dma_unmap_page(&adapter->pdev->dev,
                                       tx_buffer_info->dma,
                                       tx_buffer_info->length,
                                       DMA_TO_DEVICE);
                else
                        dma_unmap_single(&adapter->pdev->dev,
                                         tx_buffer_info->dma,
                                         tx_buffer_info->length,
                                         DMA_TO_DEVICE);
                tx_buffer_info->dma = 0;
        }
        if (tx_buffer_info->skb) {
                dev_kfree_skb_any(tx_buffer_info->skb);
                tx_buffer_info->skb = NULL;
        }
        tx_buffer_info->time_stamp = 0;
        /* tx_buffer_info must be completely set up in the transmit path */
}

#define IXGBE_MAX_TXD_PWR       14
#define IXGBE_MAX_DATA_PER_TXD  (1 << IXGBE_MAX_TXD_PWR)

/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) (((S) >> IXGBE_MAX_TXD_PWR) + \
                         (((S) & (IXGBE_MAX_DATA_PER_TXD - 1)) ? 1 : 0))
#ifdef MAX_SKB_FRAGS
#define DESC_NEEDED (TXD_USE_COUNT(IXGBE_MAX_DATA_PER_TXD) /* skb->data */ + \
        MAX_SKB_FRAGS * TXD_USE_COUNT(PAGE_SIZE) + 1)      /* for context */
#else
#define DESC_NEEDED TXD_USE_COUNT(IXGBE_MAX_DATA_PER_TXD)
#endif

static void ixgbevf_tx_timeout(struct net_device *netdev);

/**
 * ixgbevf_clean_tx_irq - Reclaim resources after transmit completes
 * @adapter: board private structure
 * @tx_ring: tx ring to clean
 **/
static bool ixgbevf_clean_tx_irq(struct ixgbevf_adapter *adapter,
                                 struct ixgbevf_ring *tx_ring)
{
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        union ixgbe_adv_tx_desc *tx_desc, *eop_desc;
        struct ixgbevf_tx_buffer *tx_buffer_info;
        unsigned int i, eop, count = 0;
        unsigned int total_bytes = 0, total_packets = 0;

        i = tx_ring->next_to_clean;
        eop = tx_ring->tx_buffer_info[i].next_to_watch;
        eop_desc = IXGBE_TX_DESC_ADV(*tx_ring, eop);

        while ((eop_desc->wb.status & cpu_to_le32(IXGBE_TXD_STAT_DD)) &&
               (count < tx_ring->work_limit)) {
                bool cleaned = false;
                rmb(); /* read buffer_info after eop_desc */
                for ( ; !cleaned; count++) {
                        struct sk_buff *skb;
                        tx_desc = IXGBE_TX_DESC_ADV(*tx_ring, i);
                        tx_buffer_info = &tx_ring->tx_buffer_info[i];
                        cleaned = (i == eop);
                        skb = tx_buffer_info->skb;

                        if (cleaned && skb) {
                                unsigned int segs, bytecount;

                                /* gso_segs is currently only valid for tcp */
                                segs = skb_shinfo(skb)->gso_segs ?: 1;
                                /* multiply data chunks by size of headers */
                                bytecount = ((segs - 1) * skb_headlen(skb)) +
                                            skb->len;
                                total_packets += segs;
                                total_bytes += bytecount;
                        }

                        ixgbevf_unmap_and_free_tx_resource(adapter,
                                                           tx_buffer_info);

                        tx_desc->wb.status = 0;

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

                eop = tx_ring->tx_buffer_info[i].next_to_watch;
                eop_desc = IXGBE_TX_DESC_ADV(*tx_ring, eop);
        }

        tx_ring->next_to_clean = i;

#define TX_WAKE_THRESHOLD (DESC_NEEDED * 2)
        if (unlikely(count && netif_carrier_ok(netdev) &&
                     (IXGBE_DESC_UNUSED(tx_ring) >= TX_WAKE_THRESHOLD))) {
                /* Make sure that anybody stopping the queue after this
                 * sees the new next_to_clean.
                 */
                smp_mb();
#ifdef HAVE_TX_MQ
                if (__netif_subqueue_stopped(netdev, tx_ring->queue_index) &&
                    !test_bit(__IXGBEVF_DOWN, &adapter->state)) {
                        netif_wake_subqueue(netdev, tx_ring->queue_index);
                        ++adapter->restart_queue;
                }
#else
                if (netif_queue_stopped(netdev) &&
                    !test_bit(__IXGBEVF_DOWN, &adapter->state)) {
                        netif_wake_queue(netdev);
                        ++adapter->restart_queue;
                }
#endif
        }

        /* re-arm the interrupt */
        if ((count >= tx_ring->work_limit) &&
            (!test_bit(__IXGBEVF_DOWN, &adapter->state))) {
                IXGBE_WRITE_REG(hw, IXGBE_VTEICS, tx_ring->v_idx);
        }

        tx_ring->total_bytes += total_bytes;
        tx_ring->total_packets += total_packets;

        netdev->stats.tx_bytes += total_bytes;
        netdev->stats.tx_packets += total_packets;

        return count < tx_ring->work_limit;
}

/**
 * ixgbevf_receive_skb - Send a completed packet up the stack
 * @q_vector: structure containing interrupt and ring information
 * @skb: packet to send up
 * @status: hardware indication of status of receive
 * @rx_ring: rx descriptor ring (for a specific queue) to setup
 * @rx_desc: rx descriptor
 **/
static void ixgbevf_receive_skb(struct ixgbevf_q_vector *q_vector,
                                struct sk_buff *skb, u8 status,
                                struct ixgbevf_ring *ring,
                                union ixgbe_adv_rx_desc *rx_desc)
{
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        bool is_vlan = (status & IXGBE_RXD_STAT_VP);
        u16 tag = le16_to_cpu(rx_desc->wb.upper.vlan);

        if (!(adapter->flags & IXGBE_FLAG_IN_NETPOLL)) {
                if (adapter->vlgrp && is_vlan)
                        vlan_gro_receive(&q_vector->napi,
                                         adapter->vlgrp,
                                         tag, skb);
                else
                        napi_gro_receive(&q_vector->napi, skb);
        } else {
                if (adapter->vlgrp && is_vlan)
                        vlan_hwaccel_rx(skb, adapter->vlgrp, tag);
                else
                        netif_rx(skb);
        }
}

/**
 * ixgbevf_rx_checksum - indicate in skb if hw indicated a good cksum
 * @adapter: address of board private structure
 * @status_err: hardware indication of status of receive
 * @skb: skb currently being received and modified
 **/
static inline void ixgbevf_rx_checksum(struct ixgbevf_adapter *adapter,
                                       u32 status_err, struct sk_buff *skb)
{
        skb_checksum_none_assert(skb);

        /* Rx csum disabled */
        if (!(adapter->flags & IXGBE_FLAG_RX_CSUM_ENABLED))
                return;

        /* if IP and error */
        if ((status_err & IXGBE_RXD_STAT_IPCS) &&
            (status_err & IXGBE_RXDADV_ERR_IPE)) {
                adapter->hw_csum_rx_error++;
                return;
        }

        if (!(status_err & IXGBE_RXD_STAT_L4CS))
                return;

        if (status_err & IXGBE_RXDADV_ERR_TCPE) {
                adapter->hw_csum_rx_error++;
                return;
        }

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

/**
 * ixgbevf_alloc_rx_buffers - Replace used receive buffers; packet split
 * @adapter: address of board private structure
 **/
static void ixgbevf_alloc_rx_buffers(struct ixgbevf_adapter *adapter,
                                     struct ixgbevf_ring *rx_ring,
                                     int cleaned_count)
{
        struct pci_dev *pdev = adapter->pdev;
        union ixgbe_adv_rx_desc *rx_desc;
        struct ixgbevf_rx_buffer *bi;
        struct sk_buff *skb;
        unsigned int i;
        unsigned int bufsz = rx_ring->rx_buf_len + NET_IP_ALIGN;

        i = rx_ring->next_to_use;
        bi = &rx_ring->rx_buffer_info[i];

        while (cleaned_count--) {
                rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);

                if (!bi->page_dma &&
                    (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED)) {
                        if (!bi->page) {
                                bi->page = netdev_alloc_page(adapter->netdev);
                                if (!bi->page) {
                                        adapter->alloc_rx_page_failed++;
                                        goto no_buffers;
                                }
                                bi->page_offset = 0;
                        } else {
                                /* use a half page if we're re-using */
                                bi->page_offset ^= (PAGE_SIZE / 2);
                        }

                        bi->page_dma = dma_map_page(&pdev->dev, bi->page,
                                                    bi->page_offset,
                                                    (PAGE_SIZE / 2),
                                                    DMA_FROM_DEVICE);
                }

                skb = bi->skb;
                if (!skb) {
                        skb = netdev_alloc_skb(adapter->netdev,
                                                               bufsz);

                        if (!skb) {
                                adapter->alloc_rx_buff_failed++;
                                goto no_buffers;
                        }

                        /*
                         * Make buffer alignment 2 beyond a 16 byte boundary
                         * this will result in a 16 byte aligned IP header after
                         * the 14 byte MAC header is removed
                         */
                        skb_reserve(skb, NET_IP_ALIGN);

                        bi->skb = skb;
                }
                if (!bi->dma) {
                        bi->dma = dma_map_single(&pdev->dev, skb->data,
                                                 rx_ring->rx_buf_len,
                                                 DMA_FROM_DEVICE);
                }
                /* Refresh the desc even if buffer_addrs didn't change because
                 * each write-back erases this info. */
                if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                        rx_desc->read.pkt_addr = cpu_to_le64(bi->page_dma);
                        rx_desc->read.hdr_addr = cpu_to_le64(bi->dma);
                } else {
                        rx_desc->read.pkt_addr = cpu_to_le64(bi->dma);
                }

                i++;
                if (i == rx_ring->count)
                        i = 0;
                bi = &rx_ring->rx_buffer_info[i];
        }

no_buffers:
        if (rx_ring->next_to_use != i) {
                rx_ring->next_to_use = i;
                if (i-- == 0)
                        i = (rx_ring->count - 1);

                ixgbevf_release_rx_desc(&adapter->hw, rx_ring, i);
        }
}

static inline void ixgbevf_irq_enable_queues(struct ixgbevf_adapter *adapter,
                                             u64 qmask)
{
        u32 mask;
        struct ixgbe_hw *hw = &adapter->hw;

        mask = (qmask & 0xFFFFFFFF);
        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, mask);
}

static inline u16 ixgbevf_get_hdr_info(union ixgbe_adv_rx_desc *rx_desc)
{
        return rx_desc->wb.lower.lo_dword.hs_rss.hdr_info;
}

static inline u16 ixgbevf_get_pkt_info(union ixgbe_adv_rx_desc *rx_desc)
{
        return rx_desc->wb.lower.lo_dword.hs_rss.pkt_info;
}

static bool ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
                                 struct ixgbevf_ring *rx_ring,
                                 int *work_done, int work_to_do)
{
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        struct pci_dev *pdev = adapter->pdev;
        union ixgbe_adv_rx_desc *rx_desc, *next_rxd;
        struct ixgbevf_rx_buffer *rx_buffer_info, *next_buffer;
        struct sk_buff *skb;
        unsigned int i;
        u32 len, staterr;
        u16 hdr_info;
        bool cleaned = false;
        int cleaned_count = 0;
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;

        i = rx_ring->next_to_clean;
        rx_desc = IXGBE_RX_DESC_ADV(*rx_ring, i);
        staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
        rx_buffer_info = &rx_ring->rx_buffer_info[i];

        while (staterr & IXGBE_RXD_STAT_DD) {
                u32 upper_len = 0;
                if (*work_done >= work_to_do)
                        break;
                (*work_done)++;

                rmb(); /* read descriptor and rx_buffer_info after status DD */
                if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                        hdr_info = le16_to_cpu(ixgbevf_get_hdr_info(rx_desc));
                        len = (hdr_info & IXGBE_RXDADV_HDRBUFLEN_MASK) >>
                               IXGBE_RXDADV_HDRBUFLEN_SHIFT;
                        if (hdr_info & IXGBE_RXDADV_SPH)
                                adapter->rx_hdr_split++;
                        if (len > IXGBEVF_RX_HDR_SIZE)
                                len = IXGBEVF_RX_HDR_SIZE;
                        upper_len = le16_to_cpu(rx_desc->wb.upper.length);
                } else {
                        len = le16_to_cpu(rx_desc->wb.upper.length);
                }
                cleaned = true;
                skb = rx_buffer_info->skb;
                prefetch(skb->data - NET_IP_ALIGN);
                rx_buffer_info->skb = NULL;

                if (rx_buffer_info->dma) {
                        dma_unmap_single(&pdev->dev, rx_buffer_info->dma,
                                         rx_ring->rx_buf_len,
                                         DMA_FROM_DEVICE);
                        rx_buffer_info->dma = 0;
                        skb_put(skb, len);
                }

                if (upper_len) {
                        dma_unmap_page(&pdev->dev, rx_buffer_info->page_dma,
                                       PAGE_SIZE / 2, DMA_FROM_DEVICE);
                        rx_buffer_info->page_dma = 0;
                        skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
                                           rx_buffer_info->page,
                                           rx_buffer_info->page_offset,
                                           upper_len);

                        if ((rx_ring->rx_buf_len > (PAGE_SIZE / 2)) ||
                            (page_count(rx_buffer_info->page) != 1))
                                rx_buffer_info->page = NULL;
                        else
                                get_page(rx_buffer_info->page);

                        skb->len += upper_len;
                        skb->data_len += upper_len;
                        skb->truesize += upper_len;
                }

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

                next_rxd = IXGBE_RX_DESC_ADV(*rx_ring, i);
                prefetch(next_rxd);
                cleaned_count++;

                next_buffer = &rx_ring->rx_buffer_info[i];

                if (!(staterr & IXGBE_RXD_STAT_EOP)) {
                        if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                                rx_buffer_info->skb = next_buffer->skb;
                                rx_buffer_info->dma = next_buffer->dma;
                                next_buffer->skb = skb;
                                next_buffer->dma = 0;
                        } else {
                                skb->next = next_buffer->skb;
                                skb->next->prev = skb;
                        }
                        adapter->non_eop_descs++;
                        goto next_desc;
                }

                /* ERR_MASK will only have valid bits if EOP set */
                if (unlikely(staterr & IXGBE_RXDADV_ERR_FRAME_ERR_MASK)) {
                        dev_kfree_skb_irq(skb);
                        goto next_desc;
                }

                ixgbevf_rx_checksum(adapter, staterr, skb);

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

                /*
                 * Work around issue of some types of VM to VM loop back
                 * packets not getting split correctly
                 */
                if (staterr & IXGBE_RXD_STAT_LB) {
                        u32 header_fixup_len = skb_headlen(skb);
                        if (header_fixup_len < 14)
                                skb_push(skb, header_fixup_len);
                }
                skb->protocol = eth_type_trans(skb, adapter->netdev);

                ixgbevf_receive_skb(q_vector, skb, staterr, rx_ring, rx_desc);

next_desc:
                rx_desc->wb.upper.status_error = 0;

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

                /* use prefetched values */
                rx_desc = next_rxd;
                rx_buffer_info = &rx_ring->rx_buffer_info[i];

                staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
        }

        rx_ring->next_to_clean = i;
        cleaned_count = IXGBE_DESC_UNUSED(rx_ring);

        if (cleaned_count)
                ixgbevf_alloc_rx_buffers(adapter, rx_ring, cleaned_count);

        rx_ring->total_packets += total_rx_packets;
        rx_ring->total_bytes += total_rx_bytes;
        adapter->netdev->stats.rx_bytes += total_rx_bytes;
        adapter->netdev->stats.rx_packets += total_rx_packets;

        return cleaned;
}

/**
 * ixgbevf_clean_rxonly - msix (aka one shot) rx clean routine
 * @napi: napi struct with our devices info in it
 * @budget: amount of work driver is allowed to do this pass, in packets
 *
 * This function is optimized for cleaning one queue only on a single
 * q_vector!!!
 **/
static int ixgbevf_clean_rxonly(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 *rx_ring = NULL;
        int work_done = 0;
        long r_idx;

        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        rx_ring = &(adapter->rx_ring[r_idx]);

        ixgbevf_clean_rx_irq(q_vector, rx_ring, &work_done, budget);

        /* If all Rx work done, exit the polling mode */
        if (work_done < budget) {
                napi_complete(napi);
                if (adapter->itr_setting & 1)
                        ixgbevf_set_itr_msix(q_vector);
                if (!test_bit(__IXGBEVF_DOWN, &adapter->state))
                        ixgbevf_irq_enable_queues(adapter, rx_ring->v_idx);
        }

        return work_done;
}

/**
 * ixgbevf_clean_rxonly_many - msix (aka one shot) rx clean routine
 * @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 rx queue associated with a
 * q_vector.
 **/
static int ixgbevf_clean_rxonly_many(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 *rx_ring = NULL;
        int work_done = 0, i;
        long r_idx;
        u64 enable_mask = 0;

        /* attempt to distribute budget to each queue fairly, but don't allow
         * the budget to go below 1 because we'll exit polling */
        budget /= (q_vector->rxr_count ?: 1);
        budget = max(budget, 1);
        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        for (i = 0; i < q_vector->rxr_count; i++) {
                rx_ring = &(adapter->rx_ring[r_idx]);
                ixgbevf_clean_rx_irq(q_vector, rx_ring, &work_done, budget);
                enable_mask |= rx_ring->v_idx;
                r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
                                      r_idx + 1);
        }

#ifndef HAVE_NETDEV_NAPI_LIST
        if (!netif_running(adapter->netdev))
                work_done = 0;

#endif
        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        rx_ring = &(adapter->rx_ring[r_idx]);

        /* If all Rx work done, exit the polling mode */
        if (work_done < budget) {
                napi_complete(napi);
                if (adapter->itr_setting & 1)
                        ixgbevf_set_itr_msix(q_vector);
                if (!test_bit(__IXGBEVF_DOWN, &adapter->state))
                        ixgbevf_irq_enable_queues(adapter, enable_mask);
        }

        return work_done;
}


/**
 * 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;
        struct ixgbe_hw *hw = &adapter->hw;
        int i, j, q_vectors, v_idx, r_idx;
        u32 mask;

        q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

        /*
         * Populate the IVAR table and set the ITR values to the
         * corresponding register.
         */
        for (v_idx = 0; v_idx < q_vectors; v_idx++) {
                q_vector = adapter->q_vector[v_idx];
                /* XXX for_each_set_bit(...) */
                r_idx = find_first_bit(q_vector->rxr_idx,
                                       adapter->num_rx_queues);

                for (i = 0; i < q_vector->rxr_count; i++) {
                        j = adapter->rx_ring[r_idx].reg_idx;
                        ixgbevf_set_ivar(adapter, 0, j, v_idx);
                        r_idx = find_next_bit(q_vector->rxr_idx,
                                              adapter->num_rx_queues,
                                              r_idx + 1);
                }
                r_idx = find_first_bit(q_vector->txr_idx,
                                       adapter->num_tx_queues);

                for (i = 0; i < q_vector->txr_count; i++) {
                        j = adapter->tx_ring[r_idx].reg_idx;
                        ixgbevf_set_ivar(adapter, 1, j, v_idx);
                        r_idx = find_next_bit(q_vector->txr_idx,
                                              adapter->num_tx_queues,
                                              r_idx + 1);
                }

                /* if this is a tx only vector halve the interrupt rate */
                if (q_vector->txr_count && !q_vector->rxr_count)
                        q_vector->eitr = (adapter->eitr_param >> 1);
                else if (q_vector->rxr_count)
                        /* rx only */
                        q_vector->eitr = adapter->eitr_param;

                ixgbevf_write_eitr(adapter, v_idx, q_vector->eitr);
        }

        ixgbevf_set_ivar(adapter, -1, 1, v_idx);

        /* set up to autoclear timer, and the vectors */
        mask = IXGBE_EIMS_ENABLE_MASK;
        mask &= ~IXGBE_EIMS_OTHER;
        IXGBE_WRITE_REG(hw, IXGBE_VTEIAC, mask);
}

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
 * @adapter: pointer to adapter
 * @eitr: eitr setting (ints per sec) to give last timeslice
 * @itr_setting: current throttle rate in ints/second
 * @packets: the number of packets during this measurement interval
 * @bytes: the number of bytes during this measurement interval
 *
 *      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 u8 ixgbevf_update_itr(struct ixgbevf_adapter *adapter,
                             u32 eitr, u8 itr_setting,
                             int packets, int bytes)
{
        unsigned int retval = itr_setting;
        u32 timepassed_us;
        u64 bytes_perint;

        if (packets == 0)
                goto update_itr_done;


        /* simple throttlerate management
         *    0-20MB/s lowest (100000 ints/s)
         *   20-100MB/s low   (20000 ints/s)
         *  100-1249MB/s bulk (8000 ints/s)
         */
        /* what was last interrupt timeslice? */
        timepassed_us = 1000000/eitr;
        bytes_perint = bytes / timepassed_us; /* bytes/usec */

        switch (itr_setting) {
        case lowest_latency:
                if (bytes_perint > adapter->eitr_low)
                        retval = low_latency;
                break;
        case low_latency:
                if (bytes_perint > adapter->eitr_high)
                        retval = bulk_latency;
                else if (bytes_perint <= adapter->eitr_low)
                        retval = lowest_latency;
                break;
        case bulk_latency:
                if (bytes_perint <= adapter->eitr_high)
                        retval = low_latency;
                break;
        }

update_itr_done:
        return retval;
}

/**
 * ixgbevf_write_eitr - write VTEITR register in hardware specific way
 * @adapter: pointer to adapter struct
 * @v_idx: vector index into q_vector array
 * @itr_reg: new value to be written in *register* format, not ints/s
 *
 * This function is made to be called by ethtool and by the driver
 * when it needs to update VTEITR registers at runtime.  Hardware
 * specific quirks/differences are taken care of here.
 */
static void ixgbevf_write_eitr(struct ixgbevf_adapter *adapter, int v_idx,
                               u32 itr_reg)
{
        struct ixgbe_hw *hw = &adapter->hw;

        itr_reg = EITR_INTS_PER_SEC_TO_REG(itr_reg);

        /*
         * 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);
}

static void ixgbevf_set_itr_msix(struct ixgbevf_q_vector *q_vector)
{
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        u32 new_itr;
        u8 current_itr, ret_itr;
        int i, r_idx, v_idx = q_vector->v_idx;
        struct ixgbevf_ring *rx_ring, *tx_ring;

        r_idx = find_first_bit(q_vector->txr_idx, adapter->num_tx_queues);
        for (i = 0; i < q_vector->txr_count; i++) {
                tx_ring = &(adapter->tx_ring[r_idx]);
                ret_itr = ixgbevf_update_itr(adapter, q_vector->eitr,
                                             q_vector->tx_itr,
                                             tx_ring->total_packets,
                                             tx_ring->total_bytes);
                /* if the result for this queue would decrease interrupt
                 * rate for this vector then use that result */
                q_vector->tx_itr = ((q_vector->tx_itr > ret_itr) ?
                                    q_vector->tx_itr - 1 : ret_itr);
                r_idx = find_next_bit(q_vector->txr_idx, adapter->num_tx_queues,
                                      r_idx + 1);
        }

        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        for (i = 0; i < q_vector->rxr_count; i++) {
                rx_ring = &(adapter->rx_ring[r_idx]);
                ret_itr = ixgbevf_update_itr(adapter, q_vector->eitr,
                                             q_vector->rx_itr,
                                             rx_ring->total_packets,
                                             rx_ring->total_bytes);
                /* if the result for this queue would decrease interrupt
                 * rate for this vector then use that result */
                q_vector->rx_itr = ((q_vector->rx_itr > ret_itr) ?
                                    q_vector->rx_itr - 1 : ret_itr);
                r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
                                      r_idx + 1);
        }

        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 = 100000;
                break;
        case low_latency:
                new_itr = 20000; /* aka hwitr = ~200 */
                break;
        case bulk_latency:
        default:
                new_itr = 8000;
                break;
        }

        if (new_itr != q_vector->eitr) {
                u32 itr_reg;

                /* save the algorithm value here, not the smoothed one */
                q_vector->eitr = new_itr;
                /* do an exponential smoothing */
                new_itr = ((q_vector->eitr * 90)/100) + ((new_itr * 10)/100);
                itr_reg = EITR_INTS_PER_SEC_TO_REG(new_itr);
                ixgbevf_write_eitr(adapter, v_idx, itr_reg);
        }
}

static irqreturn_t ixgbevf_msix_mbx(int irq, void *data)
{
        struct net_device *netdev = data;
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        u32 eicr;
        u32 msg;

        eicr = IXGBE_READ_REG(hw, IXGBE_VTEICS);
        IXGBE_WRITE_REG(hw, IXGBE_VTEICR, eicr);

        if (!hw->mbx.ops.check_for_ack(hw)) {
                /*
                 * checking for the ack clears the PFACK bit.  Place
                 * it back in the v2p_mailbox cache so that anyone
                 * polling for an ack will not miss it.  Also
                 * avoid the read below because the code to read
                 * the mailbox will also clear the ack bit.  This was
                 * causing lost acks.  Just cache the bit and exit
                 * the IRQ handler.
                 */
                hw->mbx.v2p_mailbox |= IXGBE_VFMAILBOX_PFACK;
                goto out;
        }

        /* Not an ack interrupt, go ahead and read the message */
        hw->mbx.ops.read(hw, &msg, 1);

        if ((msg & IXGBE_MBVFICR_VFREQ_MASK) == IXGBE_PF_CONTROL_MSG)
                mod_timer(&adapter->watchdog_timer,
                          round_jiffies(jiffies + 1));

out:
        return IRQ_HANDLED;
}

static irqreturn_t ixgbevf_msix_clean_tx(int irq, void *data)
{
        struct ixgbevf_q_vector *q_vector = data;
        struct ixgbevf_adapter  *adapter = q_vector->adapter;
        struct ixgbevf_ring     *tx_ring;
        int i, r_idx;

        if (!q_vector->txr_count)
                return IRQ_HANDLED;

        r_idx = find_first_bit(q_vector->txr_idx, adapter->num_tx_queues);
        for (i = 0; i < q_vector->txr_count; i++) {
                tx_ring = &(adapter->tx_ring[r_idx]);
                tx_ring->total_bytes = 0;
                tx_ring->total_packets = 0;
                ixgbevf_clean_tx_irq(adapter, tx_ring);
                r_idx = find_next_bit(q_vector->txr_idx, adapter->num_tx_queues,
                                      r_idx + 1);
        }

        if (adapter->itr_setting & 1)
                ixgbevf_set_itr_msix(q_vector);

        return IRQ_HANDLED;
}

/**
 * ixgbevf_msix_clean_rx - 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_rx(int irq, void *data)
{
        struct ixgbevf_q_vector *q_vector = data;
        struct ixgbevf_adapter  *adapter = q_vector->adapter;
        struct ixgbe_hw *hw = &adapter->hw;
        struct ixgbevf_ring  *rx_ring;
        int r_idx;
        int i;

        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        for (i = 0; i < q_vector->rxr_count; i++) {
                rx_ring = &(adapter->rx_ring[r_idx]);
                rx_ring->total_bytes = 0;
                rx_ring->total_packets = 0;
                r_idx = find_next_bit(q_vector->rxr_idx, adapter->num_rx_queues,
                                      r_idx + 1);
        }

        if (!q_vector->rxr_count)
                return IRQ_HANDLED;

        r_idx = find_first_bit(q_vector->rxr_idx, adapter->num_rx_queues);
        rx_ring = &(adapter->rx_ring[r_idx]);

        /* disable interrupts on this vector only */
        IXGBE_WRITE_REG(hw, IXGBE_VTEIMC, rx_ring->v_idx);
        napi_schedule(&q_vector->napi);


        return IRQ_HANDLED;
}

static irqreturn_t ixgbevf_msix_clean_many(int irq, void *data)
{
        ixgbevf_msix_clean_rx(irq, data);
        ixgbevf_msix_clean_tx(irq, data);

        return IRQ_HANDLED;
}

static inline void map_vector_to_rxq(struct ixgbevf_adapter *a, int v_idx,
                                     int r_idx)
{
        struct ixgbevf_q_vector *q_vector = a->q_vector[v_idx];

        set_bit(r_idx, q_vector->rxr_idx);
        q_vector->rxr_count++;
        a->rx_ring[r_idx].v_idx = 1 << v_idx;
}

static inline void map_vector_to_txq(struct ixgbevf_adapter *a, int v_idx,
                                     int t_idx)
{
        struct ixgbevf_q_vector *q_vector = a->q_vector[v_idx];

        set_bit(t_idx, q_vector->txr_idx);
        q_vector->txr_count++;
        a->tx_ring[t_idx].v_idx = 1 << v_idx;
}

/**
 * ixgbevf_map_rings_to_vectors - Maps descriptor rings to vectors
 * @adapter: board private structure to initialize
 *
 * This function maps descriptor rings to the queue-specific vectors
 * we were allotted through the MSI-X enabling code.  Ideally, we'd have
 * one vector per ring/queue, but on a constrained vector budget, we
 * group the rings as "efficiently" as possible.  You would add new
 * mapping configurations in here.
 **/
static int ixgbevf_map_rings_to_vectors(struct ixgbevf_adapter *adapter)
{
        int q_vectors;
        int v_start = 0;
        int rxr_idx = 0, txr_idx = 0;
        int rxr_remaining = adapter->num_rx_queues;
        int txr_remaining = adapter->num_tx_queues;
        int i, j;
        int rqpv, tqpv;
        int err = 0;

        q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

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

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

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

out:
        return err;
}

/**
 * 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;
        irqreturn_t (*handler)(int, void *);
        int i, vector, q_vectors, err;
        int ri = 0, ti = 0;

        /* Decrement for Other and TCP Timer vectors */
        q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

#define SET_HANDLER(_v) (((_v)->rxr_count && (_v)->txr_count)          \
                                          ? &ixgbevf_msix_clean_many : \
                          (_v)->rxr_count ? &ixgbevf_msix_clean_rx   : \
                          (_v)->txr_count ? &ixgbevf_msix_clean_tx   : \
                          NULL)
        for (vector = 0; vector < q_vectors; vector++) {
                handler = SET_HANDLER(adapter->q_vector[vector]);

                if (handler == &ixgbevf_msix_clean_rx) {
                        sprintf(adapter->name[vector], "%s-%s-%d",
                                netdev->name, "rx", ri++);
                } else if (handler == &ixgbevf_msix_clean_tx) {
                        sprintf(adapter->name[vector], "%s-%s-%d",
                                netdev->name, "tx", ti++);
                } else if (handler == &ixgbevf_msix_clean_many) {
                        sprintf(adapter->name[vector], "%s-%s-%d",
                                netdev->name, "TxRx", vector);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }
                err = request_irq(adapter->msix_entries[vector].vector,
                                  handler, 0, adapter->name[vector],
                                  adapter->q_vector[vector]);
                if (err) {
                        hw_dbg(&adapter->hw,
                               "request_irq failed for MSIX interrupt "
                               "Error: %d\n", err);
                        goto free_queue_irqs;
                }
        }

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

        return 0;

free_queue_irqs:
        for (i = vector - 1; i >= 0; i--)
                free_irq(adapter->msix_entries[--vector].vector,
                         &(adapter->q_vector[i]));
        pci_disable_msix(adapter->pdev);
        kfree(adapter->msix_entries);
        adapter->msix_entries = NULL;
        return err;
}

static inline void ixgbevf_reset_q_vectors(struct ixgbevf_adapter *adapter)
{
        int i, q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

        for (i = 0; i < q_vectors; i++) {
                struct ixgbevf_q_vector *q_vector = adapter->q_vector[i];
                bitmap_zero(q_vector->rxr_idx, MAX_RX_QUEUES);
                bitmap_zero(q_vector->txr_idx, MAX_TX_QUEUES);
                q_vector->rxr_count = 0;
                q_vector->txr_count = 0;
                q_vector->eitr = adapter->eitr_param;
        }
}

/**
 * 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 = 0;

        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)
{
        struct net_device *netdev = adapter->netdev;
        int i, q_vectors;

        q_vectors = adapter->num_msix_vectors;

        i = q_vectors - 1;

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

        for (; i >= 0; i--) {
                free_irq(adapter->msix_entries[i].vector,
                         adapter->q_vector[i]);
        }

        ixgbevf_reset_q_vectors(adapter);
}

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

        IXGBE_WRITE_REG(hw, IXGBE_VTEIMC, ~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,
                                      bool queues, bool flush)
{
        struct ixgbe_hw *hw = &adapter->hw;
        u32 mask;
        u64 qmask;

        mask = (IXGBE_EIMS_ENABLE_MASK & ~IXGBE_EIMS_RTX_QUEUE);
        qmask = ~0;

        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, mask);

        if (queues)
                ixgbevf_irq_enable_queues(adapter, qmask);

        if (flush)
                IXGBE_WRITE_FLUSH(hw);
}

/**
 * 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)
{
        u64 tdba;
        struct ixgbe_hw *hw = &adapter->hw;
        u32 i, j, tdlen, txctrl;

        /* Setup the HW Tx Head and Tail descriptor pointers */
        for (i = 0; i < adapter->num_tx_queues; i++) {
                struct ixgbevf_ring *ring = &adapter->tx_ring[i];
                j = ring->reg_idx;
                tdba = ring->dma;
                tdlen = ring->count * sizeof(union ixgbe_adv_tx_desc);
                IXGBE_WRITE_REG(hw, IXGBE_VFTDBAL(j),
                                (tdba & DMA_BIT_MASK(32)));
                IXGBE_WRITE_REG(hw, IXGBE_VFTDBAH(j), (tdba >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_VFTDLEN(j), tdlen);
                IXGBE_WRITE_REG(hw, IXGBE_VFTDH(j), 0);
                IXGBE_WRITE_REG(hw, IXGBE_VFTDT(j), 0);
                adapter->tx_ring[i].head = IXGBE_VFTDH(j);
                adapter->tx_ring[i].tail = IXGBE_VFTDT(j);
                /* Disable Tx Head Writeback RO bit, since this hoses
                 * bookkeeping if things aren't delivered in order.
                 */
                txctrl = IXGBE_READ_REG(hw, IXGBE_VFDCA_TXCTRL(j));
                txctrl &= ~IXGBE_DCA_TXCTRL_TX_WB_RO_EN;
                IXGBE_WRITE_REG(hw, IXGBE_VFDCA_TXCTRL(j), txctrl);
        }
}

#define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2

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

        rx_ring = &adapter->rx_ring[index];

        srrctl = IXGBE_SRRCTL_DROP_EN;

        if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                u16 bufsz = IXGBEVF_RXBUFFER_2048;
                /* grow the amount we can receive on large page machines */
                if (bufsz < (PAGE_SIZE / 2))
                        bufsz = (PAGE_SIZE / 2);
                /* cap the bufsz at our largest descriptor size */
                bufsz = min((u16)IXGBEVF_MAX_RXBUFFER, bufsz);

                srrctl |= bufsz >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
                srrctl |= IXGBE_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
                srrctl |= ((IXGBEVF_RX_HDR_SIZE <<
                           IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT) &
                           IXGBE_SRRCTL_BSIZEHDR_MASK);
        } else {
                srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;

                if (rx_ring->rx_buf_len == MAXIMUM_ETHERNET_VLAN_SIZE)
                        srrctl |= IXGBEVF_RXBUFFER_2048 >>
                                IXGBE_SRRCTL_BSIZEPKT_SHIFT;
                else
                        srrctl |= rx_ring->rx_buf_len >>
                                IXGBE_SRRCTL_BSIZEPKT_SHIFT;
        }
        IXGBE_WRITE_REG(hw, IXGBE_VFSRRCTL(index), srrctl);
}

/**
 * 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)
{
        u64 rdba;
        struct ixgbe_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        int max_frame = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
        int i, j;
        u32 rdlen;
        int rx_buf_len;

        /* Decide whether to use packet split mode or not */
        if (netdev->mtu > ETH_DATA_LEN) {
                if (adapter->flags & IXGBE_FLAG_RX_PS_CAPABLE)
                        adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
                else
                        adapter->flags &= ~IXGBE_FLAG_RX_PS_ENABLED;
        } else {
                if (adapter->flags & IXGBE_FLAG_RX_1BUF_CAPABLE)
                        adapter->flags &= ~IXGBE_FLAG_RX_PS_ENABLED;
                else
                        adapter->flags |= IXGBE_FLAG_RX_PS_ENABLED;
        }

        /* Set the RX buffer length according to the mode */
        if (adapter->flags & IXGBE_FLAG_RX_PS_ENABLED) {
                /* PSRTYPE must be initialized in 82599 */
                u32 psrtype = IXGBE_PSRTYPE_TCPHDR |
                        IXGBE_PSRTYPE_UDPHDR |
                        IXGBE_PSRTYPE_IPV4HDR |
                        IXGBE_PSRTYPE_IPV6HDR |
                        IXGBE_PSRTYPE_L2HDR;
                IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, psrtype);
                rx_buf_len = IXGBEVF_RX_HDR_SIZE;
        } else {
                IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, 0);
                if (netdev->mtu <= ETH_DATA_LEN)
                        rx_buf_len = MAXIMUM_ETHERNET_VLAN_SIZE;
                else
                        rx_buf_len = ALIGN(max_frame, 1024);
        }

        rdlen = adapter->rx_ring[0].count * sizeof(union ixgbe_adv_rx_desc);
        /* 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++) {
                rdba = adapter->rx_ring[i].dma;
                j = adapter->rx_ring[i].reg_idx;
                IXGBE_WRITE_REG(hw, IXGBE_VFRDBAL(j),
                                (rdba & DMA_BIT_MASK(32)));
                IXGBE_WRITE_REG(hw, IXGBE_VFRDBAH(j), (rdba >> 32));
                IXGBE_WRITE_REG(hw, IXGBE_VFRDLEN(j), rdlen);
                IXGBE_WRITE_REG(hw, IXGBE_VFRDH(j), 0);
                IXGBE_WRITE_REG(hw, IXGBE_VFRDT(j), 0);
                adapter->rx_ring[i].head = IXGBE_VFRDH(j);
                adapter->rx_ring[i].tail = IXGBE_VFRDT(j);
                adapter->rx_ring[i].rx_buf_len = rx_buf_len;

                ixgbevf_configure_srrctl(adapter, j);
        }
}

static void ixgbevf_vlan_rx_register(struct net_device *netdev,
                                     struct vlan_group *grp)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        int i, j;
        u32 ctrl;

        adapter->vlgrp = grp;

        for (i = 0; i < adapter->num_rx_queues; i++) {
                j = adapter->rx_ring[i].reg_idx;
                ctrl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(j));
                ctrl |= IXGBE_RXDCTL_VME;
                IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(j), ctrl);
        }
}

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

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

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

        if (!test_bit(__IXGBEVF_DOWN, &adapter->state))
                ixgbevf_irq_disable(adapter);

        vlan_group_set_device(adapter->vlgrp, vid, NULL);

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

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

static void ixgbevf_restore_vlan(struct ixgbevf_adapter *adapter)
{
        ixgbevf_vlan_rx_register(adapter->netdev, adapter->vlgrp);

        if (adapter->vlgrp) {
                u16 vid;
                for (vid = 0; vid < VLAN_N_VID; vid++) {
                        if (!vlan_group_get_device(adapter->vlgrp, vid))
                                continue;
                        ixgbevf_vlan_rx_add_vid(adapter->netdev, 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) {
                printk(KERN_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 macvlans on this VF.
                 */
                hw->mac.ops.set_uc_addr(hw, 0, NULL);
        }

        return count;
}

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

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

        ixgbevf_write_uc_addr_list(netdev);
}

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++) {
                struct napi_struct *napi;
                q_vector = adapter->q_vector[q_idx];
                if (!q_vector->rxr_count)
                        continue;
                napi = &q_vector->napi;
                if (q_vector->rxr_count > 1)
                        napi->poll = &ixgbevf_clean_rxonly_many;

                napi_enable(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];
                if (!q_vector->rxr_count)
                        continue;
                napi_disable(&q_vector->napi);
        }
}

static void ixgbevf_configure(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int i;

        ixgbevf_set_rx_mode(netdev);

        ixgbevf_restore_vlan(adapter);

        ixgbevf_configure_tx(adapter);
        ixgbevf_configure_rx(adapter);
        for (i = 0; i < adapter->num_rx_queues; i++) {
                struct ixgbevf_ring *ring = &adapter->rx_ring[i];
                ixgbevf_alloc_rx_buffers(adapter, ring, ring->count);
                ring->next_to_use = ring->count - 1;
                writel(ring->next_to_use, adapter->hw.hw_addr + ring->tail);
        }
}

#define IXGBE_MAX_RX_DESC_POLL 10
static inline void ixgbevf_rx_desc_queue_enable(struct ixgbevf_adapter *adapter,
                                                int rxr)
{
        struct ixgbe_hw *hw = &adapter->hw;
        int j = adapter->rx_ring[rxr].reg_idx;
        int k;

        for (k = 0; k < IXGBE_MAX_RX_DESC_POLL; k++) {
                if (IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(j)) & IXGBE_RXDCTL_ENABLE)
                        break;
                else
                        msleep(1);
        }
        if (k >= IXGBE_MAX_RX_DESC_POLL) {
                hw_dbg(hw, "RXDCTL.ENABLE on Rx queue %d "
                       "not set within the polling period\n", rxr);
        }

        ixgbevf_release_rx_desc(&adapter->hw, &adapter->rx_ring[rxr],
                                (adapter->rx_ring[rxr].count - 1));
}

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 int ixgbevf_up_complete(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        int i, j = 0;
        int num_rx_rings = adapter->num_rx_queues;
        u32 txdctl, rxdctl;

        for (i = 0; i < adapter->num_tx_queues; i++) {
                j = adapter->tx_ring[i].reg_idx;
                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(j));
                /* enable WTHRESH=8 descriptors, to encourage burst writeback */
                txdctl |= (8 << 16);
                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(j), txdctl);
        }

        for (i = 0; i < adapter->num_tx_queues; i++) {
                j = adapter->tx_ring[i].reg_idx;
                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(j));
                txdctl |= IXGBE_TXDCTL_ENABLE;
                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(j), txdctl);
        }

        for (i = 0; i < num_rx_rings; i++) {
                j = adapter->rx_ring[i].reg_idx;
                rxdctl = IXGBE_READ_REG(hw, IXGBE_VFRXDCTL(j));
                rxdctl |= IXGBE_RXDCTL_ENABLE;
                if (hw->mac.type == ixgbe_mac_X540_vf) {
                        rxdctl &= ~IXGBE_RXDCTL_RLPMLMASK;
                        rxdctl |= ((netdev->mtu + ETH_HLEN + ETH_FCS_LEN) |
                                   IXGBE_RXDCTL_RLPML_EN);
                }
                IXGBE_WRITE_REG(hw, IXGBE_VFRXDCTL(j), rxdctl);
                ixgbevf_rx_desc_queue_enable(adapter, i);
        }

        ixgbevf_configure_msix(adapter);

        if (hw->mac.ops.set_rar) {
                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);
        }

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

        /* enable transmits */
        netif_tx_start_all_queues(netdev);

        ixgbevf_save_reset_stats(adapter);
        ixgbevf_init_last_counter_stats(adapter);

        /* bring the link up in the watchdog, this could race with our first
         * link up interrupt but shouldn't be a problem */
        adapter->flags |= IXGBE_FLAG_NEED_LINK_UPDATE;
        adapter->link_check_timeout = jiffies;
        mod_timer(&adapter->watchdog_timer, jiffies);
        return 0;
}

int ixgbevf_up(struct ixgbevf_adapter *adapter)
{
        int err;
        struct ixgbe_hw *hw = &adapter->hw;

        ixgbevf_configure(adapter);

        err = ixgbevf_up_complete(adapter);

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

        ixgbevf_irq_enable(adapter, true, true);

        return err;
}

/**
 * ixgbevf_clean_rx_ring - Free Rx Buffers per Queue
 * @adapter: board private structure
 * @rx_ring: ring to free buffers from
 **/
static void ixgbevf_clean_rx_ring(struct ixgbevf_adapter *adapter,
                                  struct ixgbevf_ring *rx_ring)
{
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        unsigned int i;

        if (!rx_ring->rx_buffer_info)
                return;

        /* Free all the Rx ring sk_buffs */
        for (i = 0; i < rx_ring->count; i++) {
                struct ixgbevf_rx_buffer *rx_buffer_info;

                rx_buffer_info = &rx_ring->rx_buffer_info[i];
                if (rx_buffer_info->dma) {
                        dma_unmap_single(&pdev->dev, rx_buffer_info->dma,
                                         rx_ring->rx_buf_len,
                                         DMA_FROM_DEVICE);
                        rx_buffer_info->dma = 0;
                }
                if (rx_buffer_info->skb) {
                        struct sk_buff *skb = rx_buffer_info->skb;
                        rx_buffer_info->skb = NULL;
                        do {
                                struct sk_buff *this = skb;
                                skb = skb->prev;
                                dev_kfree_skb(this);
                        } while (skb);
                }
                if (!rx_buffer_info->page)
                        continue;
                dma_unmap_page(&pdev->dev, rx_buffer_info->page_dma,
                               PAGE_SIZE / 2, DMA_FROM_DEVICE);
                rx_buffer_info->page_dma = 0;
                put_page(rx_buffer_info->page);
                rx_buffer_info->page = NULL;
                rx_buffer_info->page_offset = 0;
        }

        size = sizeof(struct ixgbevf_rx_buffer) * rx_ring->count;
        memset(rx_ring->rx_buffer_info, 0, size);

        /* Zero out the descriptor ring */
        memset(rx_ring->desc, 0, rx_ring->size);

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

        if (rx_ring->head)
                writel(0, adapter->hw.hw_addr + rx_ring->head);
        if (rx_ring->tail)
                writel(0, adapter->hw.hw_addr + rx_ring->tail);
}

/**
 * ixgbevf_clean_tx_ring - Free Tx Buffers
 * @adapter: board private structure
 * @tx_ring: ring to be cleaned
 **/
static void ixgbevf_clean_tx_ring(struct ixgbevf_adapter *adapter,
                                  struct ixgbevf_ring *tx_ring)
{
        struct ixgbevf_tx_buffer *tx_buffer_info;
        unsigned long size;
        unsigned int i;

        if (!tx_ring->tx_buffer_info)
                return;

        /* Free all the Tx ring sk_buffs */

        for (i = 0; i < tx_ring->count; i++) {
                tx_buffer_info = &tx_ring->tx_buffer_info[i];
                ixgbevf_unmap_and_free_tx_resource(adapter, tx_buffer_info);
        }

        size = sizeof(struct ixgbevf_tx_buffer) * tx_ring->count;
        memset(tx_ring->tx_buffer_info, 0, size);

        memset(tx_ring->desc, 0, tx_ring->size);

        tx_ring->next_to_use = 0;
        tx_ring->next_to_clean = 0;

        if (tx_ring->head)
                writel(0, adapter->hw.hw_addr + tx_ring->head);
        if (tx_ring->tail)
                writel(0, adapter->hw.hw_addr + tx_ring->tail);
}

/**
 * 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, &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, &adapter->tx_ring[i]);
}

void ixgbevf_down(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        u32 txdctl;
        int i, j;

        /* signal that we are down to the interrupt handler */
        set_bit(__IXGBEVF_DOWN, &adapter->state);
        /* disable receives */

        netif_tx_disable(netdev);

        msleep(10);

        netif_tx_stop_all_queues(netdev);

        ixgbevf_irq_disable(adapter);

        ixgbevf_napi_disable_all(adapter);

        del_timer_sync(&adapter->watchdog_timer);
        /* can't call flush scheduled work here because it can deadlock
         * if linkwatch_event tries to acquire the rtnl_lock which we are
         * holding */
        while (adapter->flags & IXGBE_FLAG_IN_WATCHDOG_TASK)
                msleep(1);

        /* disable transmits in the hardware now that interrupts are off */
        for (i = 0; i < adapter->num_tx_queues; i++) {
                j = adapter->tx_ring[i].reg_idx;
                txdctl = IXGBE_READ_REG(hw, IXGBE_VFTXDCTL(j));
                IXGBE_WRITE_REG(hw, IXGBE_VFTXDCTL(j),
                                (txdctl & ~IXGBE_TXDCTL_ENABLE));
        }

        netif_carrier_off(netdev);

        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)
{
        struct ixgbe_hw *hw = &adapter->hw;

        WARN_ON(in_interrupt());

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

        /*
         * Check if PF is up before re-init.  If not then skip until
         * later when the PF is up and ready to service requests from
         * the VF via mailbox.  If the VF is up and running then the
         * watchdog task will continue to schedule reset tasks until
         * the PF is up and running.
         */
        if (!hw->mac.ops.reset_hw(hw)) {
                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);

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

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

        /* We'll want at least 3 (vector_threshold):
         * 1) TxQ[0] Cleanup
         * 2) RxQ[0] Cleanup
         * 3) 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.
         */
        while (vectors >= vector_threshold) {
                err = pci_enable_msix(adapter->pdev, adapter->msix_entries,
                                      vectors);
                if (!err) /* Success in acquiring all requested vectors. */
                        break;
                else if (err < 0)
                        vectors = 0; /* Nasty failure, quit now */
                else /* err == number of vectors we should try again with */
                        vectors = err;
        }

        if (vectors < vector_threshold) {
                /* Can't allocate enough MSI-X interrupts?  Oh well.
                 * This just means we'll go with either a single MSI
                 * vector or fall back to legacy interrupts.
                 */
                hw_dbg(&adapter->hw,
                       "Unable to allocate MSI-X interrupts\n");
                kfree(adapter->msix_entries);
                adapter->msix_entries = NULL;
        } else {
                /*
                 * 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;
        }
}

/*
 * 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)
{
        /* Start with base case */
        adapter->num_rx_queues = 1;
        adapter->num_tx_queues = 1;
        adapter->num_rx_pools = adapter->num_rx_queues;
        adapter->num_rx_queues_per_pool = 1;
}

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

        adapter->tx_ring = kcalloc(adapter->num_tx_queues,
                                   sizeof(struct ixgbevf_ring), GFP_KERNEL);
        if (!adapter->tx_ring)
                goto err_tx_ring_allocation;

        adapter->rx_ring = kcalloc(adapter->num_rx_queues,
                                   sizeof(struct ixgbevf_ring), GFP_KERNEL);
        if (!adapter->rx_ring)
                goto err_rx_ring_allocation;

        for (i = 0; i < adapter->num_tx_queues; i++) {

                adapter->tx_ring[i].count = adapter->tx_ring_count;
                adapter->tx_ring[i].queue_index = i;
                adapter->tx_ring[i].reg_idx = i;
        }

        for (i = 0; i < adapter->num_rx_queues; i++) {
                adapter->rx_ring[i].count = adapter->rx_ring_count;
                adapter->rx_ring[i].queue_index = i;
                adapter->rx_ring[i].reg_idx = i;
        }

        return 0;

err_rx_ring_allocation:
        kfree(adapter->tx_ring);
err_tx_ring_allocation:
        return -ENOMEM;
}

/**
 * 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 err = 0;
        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) twice the number of vectors as there are CPU's.
         */
        v_budget = min(adapter->num_rx_queues + adapter->num_tx_queues,
                       (int)(num_online_cpus() * 2)) + NON_Q_VECTORS;

        /* A failure in MSI-X entry allocation isn't fatal, but it does
         * mean we disable MSI-X capabilities of the adapter. */
        adapter->msix_entries = kcalloc(v_budget,
                                        sizeof(struct msix_entry), GFP_KERNEL);
        if (!adapter->msix_entries) {
                err = -ENOMEM;
                goto out;
        }

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

        ixgbevf_acquire_msix_vectors(adapter, v_budget);

out:
        return err;
}

/**
 * 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_idx, num_q_vectors;
        struct ixgbevf_q_vector *q_vector;
        int napi_vectors;
        int (*poll)(struct napi_struct *, int);

        num_q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
        napi_vectors = adapter->num_rx_queues;
        poll = &ixgbevf_clean_rxonly;

        for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
                q_vector = kzalloc(sizeof(struct ixgbevf_q_vector), GFP_KERNEL);
                if (!q_vector)
                        goto err_out;
                q_vector->adapter = adapter;
                q_vector->v_idx = q_idx;
                q_vector->eitr = adapter->eitr_param;
                if (q_idx < napi_vectors)
                        netif_napi_add(adapter->netdev, &q_vector->napi,
                                       (*poll), 64);
                adapter->q_vector[q_idx] = q_vector;
        }

        return 0;

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

/**
 * 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_idx, num_q_vectors;
        int napi_vectors;

        num_q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;
        napi_vectors = adapter->num_rx_queues;

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

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

/**
 * ixgbevf_reset_interrupt_capability - Reset MSIX setup
 * @adapter: board private structure
 *
 **/
static void ixgbevf_reset_interrupt_capability(struct ixgbevf_adapter *adapter)
{
        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;
        }

        err = ixgbevf_alloc_queues(adapter);
        if (err) {
                printk(KERN_ERR "Unable to allocate memory for queues\n");
                goto err_alloc_queues;
        }

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

        set_bit(__IXGBEVF_DOWN, &adapter->state);

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

/**
 * ixgbevf_sw_init - Initialize general software structures
 * (struct ixgbevf_adapter)
 * @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 __devinit ixgbevf_sw_init(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;
        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;
        hw->subsystem_device_id = pdev->subsystem_device;

        hw->mbx.ops.init_params(hw);
        hw->mac.max_tx_queues = MAX_TX_QUEUES;
        hw->mac.max_rx_queues = MAX_RX_QUEUES;
        err = hw->mac.ops.reset_hw(hw);
        if (err) {
                dev_info(&pdev->dev,
                         "PF still in reset state, assigning new address\n");
                dev_hw_addr_random(adapter->netdev, hw->mac.addr);
        } else {
                err = hw->mac.ops.init_hw(hw);
                if (err) {
                        printk(KERN_ERR "init_shared_code failed: %d\n", err);
                        goto out;
                }
        }

        /* Enable dynamic interrupt throttling rates */
        adapter->eitr_param = 20000;
        adapter->itr_setting = 1;

        /* set defaults for eitr in MegaBytes */
        adapter->eitr_low = 10;
        adapter->eitr_high = 20;

        /* set default ring sizes */
        adapter->tx_ring_count = IXGBEVF_DEFAULT_TXD;
        adapter->rx_ring_count = IXGBEVF_DEFAULT_RXD;

        /* enable rx csum by default */
        adapter->flags |= IXGBE_FLAG_RX_CSUM_ENABLED;

        set_bit(__IXGBEVF_DOWN, &adapter->state);

out:
        return err;
}

#define UPDATE_VF_COUNTER_32bit(reg, last_counter, counter)     \
        {                                                       \
                u32 current_counter = IXGBE_READ_REG(hw, reg);  \
                if (current_counter < last_counter)             \
                        counter += 0x100000000LL;               \
                last_counter = current_counter;                 \
                counter &= 0xFFFFFFFF00000000LL;                \
                counter |= current_counter;                     \
        }

#define UPDATE_VF_COUNTER_36bit(reg_lsb, reg_msb, last_counter, counter) \
        {                                                                \
                u64 current_counter_lsb = IXGBE_READ_REG(hw, reg_lsb);   \
                u64 current_counter_msb = IXGBE_READ_REG(hw, reg_msb);   \
                u64 current_counter = (current_counter_msb << 32) |      \
                        current_counter_lsb;                             \
                if (current_counter < last_counter)                      \
                        counter += 0x1000000000LL;                       \
                last_counter = current_counter;                          \
                counter &= 0xFFFFFFF000000000LL;                         \
                counter |= current_counter;                              \
        }
/**
 * ixgbevf_update_stats - Update the board statistics counters.
 * @adapter: board private structure
 **/
void ixgbevf_update_stats(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;

        UPDATE_VF_COUNTER_32bit(IXGBE_VFGPRC, adapter->stats.last_vfgprc,
                                adapter->stats.vfgprc);
        UPDATE_VF_COUNTER_32bit(IXGBE_VFGPTC, adapter->stats.last_vfgptc,
                                adapter->stats.vfgptc);
        UPDATE_VF_COUNTER_36bit(IXGBE_VFGORC_LSB, IXGBE_VFGORC_MSB,
                                adapter->stats.last_vfgorc,
                                adapter->stats.vfgorc);
        UPDATE_VF_COUNTER_36bit(IXGBE_VFGOTC_LSB, IXGBE_VFGOTC_MSB,
                                adapter->stats.last_vfgotc,
                                adapter->stats.vfgotc);
        UPDATE_VF_COUNTER_32bit(IXGBE_VFMPRC, adapter->stats.last_vfmprc,
                                adapter->stats.vfmprc);

        /* Fill out the OS statistics structure */
        adapter->netdev->stats.multicast = adapter->stats.vfmprc -
                adapter->stats.base_vfmprc;
}

/**
 * ixgbevf_watchdog - Timer Call-back
 * @data: pointer to adapter cast into an unsigned long
 **/
static void ixgbevf_watchdog(unsigned long data)
{
        struct ixgbevf_adapter *adapter = (struct ixgbevf_adapter *)data;
        struct ixgbe_hw *hw = &adapter->hw;
        u64 eics = 0;
        int i;

        /*
         * Do the watchdog outside of interrupt context due to the lovely
         * delays that some of the newer hardware requires
         */

        if (test_bit(__IXGBEVF_DOWN, &adapter->state))
                goto watchdog_short_circuit;

        /* get one bit for every active tx/rx interrupt vector */
        for (i = 0; i < adapter->num_msix_vectors - NON_Q_VECTORS; i++) {
                struct ixgbevf_q_vector *qv = adapter->q_vector[i];
                if (qv->rxr_count || qv->txr_count)
                        eics |= (1 << i);
        }

        IXGBE_WRITE_REG(hw, IXGBE_VTEICS, (u32)eics);

watchdog_short_circuit:
        schedule_work(&adapter->watchdog_task);
}

/**
 * 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);

        /* Do the reset outside of interrupt context */
        schedule_work(&adapter->reset_task);
}

static void ixgbevf_reset_task(struct work_struct *work)
{
        struct ixgbevf_adapter *adapter;
        adapter = container_of(work, struct ixgbevf_adapter, reset_task);

        /* If we're already down or resetting, just bail */
        if (test_bit(__IXGBEVF_DOWN, &adapter->state) ||
            test_bit(__IXGBEVF_RESETTING, &adapter->state))
                return;

        adapter->tx_timeout_count++;

        ixgbevf_reinit_locked(adapter);
}

/**
 * ixgbevf_watchdog_task - worker thread to bring link up
 * @work: pointer to work_struct containing our data
 **/
static void ixgbevf_watchdog_task(struct work_struct *work)
{
        struct ixgbevf_adapter *adapter = container_of(work,
                                                       struct ixgbevf_adapter,
                                                       watchdog_task);
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        u32 link_speed = adapter->link_speed;
        bool link_up = adapter->link_up;

        adapter->flags |= IXGBE_FLAG_IN_WATCHDOG_TASK;

        /*
         * Always check the link on the watchdog because we have
         * no LSC interrupt
         */
        if (hw->mac.ops.check_link) {
                if ((hw->mac.ops.check_link(hw, &link_speed,
                                            &link_up, false)) != 0) {
                        adapter->link_up = link_up;
                        adapter->link_speed = link_speed;
                        netif_carrier_off(netdev);
                        netif_tx_stop_all_queues(netdev);
                        schedule_work(&adapter->reset_task);
                        goto pf_has_reset;
                }
        } else {
                /* always assume link is up, if no check link
                 * function */
                link_speed = IXGBE_LINK_SPEED_10GB_FULL;
                link_up = true;
        }
        adapter->link_up = link_up;
        adapter->link_speed = link_speed;

        if (link_up) {
                if (!netif_carrier_ok(netdev)) {
                        hw_dbg(&adapter->hw, "NIC Link is Up, %u Gbps\n",
                               (link_speed == IXGBE_LINK_SPEED_10GB_FULL) ?
                               10 : 1);
                        netif_carrier_on(netdev);
                        netif_tx_wake_all_queues(netdev);
                }
        } else {
                adapter->link_up = false;
                adapter->link_speed = 0;
                if (netif_carrier_ok(netdev)) {
                        hw_dbg(&adapter->hw, "NIC Link is Down\n");
                        netif_carrier_off(netdev);
                        netif_tx_stop_all_queues(netdev);
                }
        }

        ixgbevf_update_stats(adapter);

pf_has_reset:
        /* Reset the timer */
        if (!test_bit(__IXGBEVF_DOWN, &adapter->state))
                mod_timer(&adapter->watchdog_timer,
                          round_jiffies(jiffies + (2 * HZ)));

        adapter->flags &= ~IXGBE_FLAG_IN_WATCHDOG_TASK;
}

/**
 * ixgbevf_free_tx_resources - Free Tx Resources per Queue
 * @adapter: board private structure
 * @tx_ring: Tx descriptor ring for a specific queue
 *
 * Free all transmit software resources
 **/
void ixgbevf_free_tx_resources(struct ixgbevf_adapter *adapter,
                               struct ixgbevf_ring *tx_ring)
{
        struct pci_dev *pdev = adapter->pdev;

        ixgbevf_clean_tx_ring(adapter, tx_ring);

        vfree(tx_ring->tx_buffer_info);
        tx_ring->tx_buffer_info = NULL;

        dma_free_coherent(&pdev->dev, tx_ring->size, tx_ring->desc,
                          tx_ring->dma);

        tx_ring->desc = NULL;
}

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

        for (i = 0; i < adapter->num_tx_queues; i++)
                if (adapter->tx_ring[i].desc)
                        ixgbevf_free_tx_resources(adapter,
                                                  &adapter->tx_ring[i]);

}

/**
 * ixgbevf_setup_tx_resources - allocate Tx resources (Descriptors)
 * @adapter: board private structure
 * @tx_ring:    tx descriptor ring (for a specific queue) to setup
 *
 * Return 0 on success, negative on failure
 **/
int ixgbevf_setup_tx_resources(struct ixgbevf_adapter *adapter,
                               struct ixgbevf_ring *tx_ring)
{
        struct pci_dev *pdev = adapter->pdev;
        int size;

        size = sizeof(struct ixgbevf_tx_buffer) * tx_ring->count;
        tx_ring->tx_buffer_info = vzalloc(size);
        if (!tx_ring->tx_buffer_info)
                goto err;

        /* round up to nearest 4K */
        tx_ring->size = tx_ring->count * sizeof(union ixgbe_adv_tx_desc);
        tx_ring->size = ALIGN(tx_ring->size, 4096);

        tx_ring->desc = dma_alloc_coherent(&pdev->dev, tx_ring->size,
                                           &tx_ring->dma, GFP_KERNEL);
        if (!tx_ring->desc)
                goto err;

        tx_ring->next_to_use = 0;
        tx_ring->next_to_clean = 0;
        tx_ring->work_limit = tx_ring->count;
        return 0;

err:
        vfree(tx_ring->tx_buffer_info);
        tx_ring->tx_buffer_info = NULL;
        hw_dbg(&adapter->hw, "Unable to allocate memory for the transmit "
               "descriptor ring\n");
        return -ENOMEM;
}

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

        for (i = 0; i < adapter->num_tx_queues; i++) {
                err = ixgbevf_setup_tx_resources(adapter, &adapter->tx_ring[i]);
                if (!err)
                        continue;
                hw_dbg(&adapter->hw,
                       "Allocation for Tx Queue %u failed\n", i);
                break;
        }

        return err;
}

/**
 * ixgbevf_setup_rx_resources - allocate Rx resources (Descriptors)
 * @adapter: board private structure
 * @rx_ring:    rx descriptor ring (for a specific queue) to setup
 *
 * Returns 0 on success, negative on failure
 **/
int ixgbevf_setup_rx_resources(struct ixgbevf_adapter *adapter,
                               struct ixgbevf_ring *rx_ring)
{
        struct pci_dev *pdev = adapter->pdev;
        int size;

        size = sizeof(struct ixgbevf_rx_buffer) * rx_ring->count;
        rx_ring->rx_buffer_info = vzalloc(size);
        if (!rx_ring->rx_buffer_info) {
                hw_dbg(&adapter->hw,
                       "Unable to vmalloc buffer memory for "
                       "the receive descriptor ring\n");
                goto alloc_failed;
        }

        /* Round up to nearest 4K */
        rx_ring->size = rx_ring->count * sizeof(union ixgbe_adv_rx_desc);
        rx_ring->size = ALIGN(rx_ring->size, 4096);

        rx_ring->desc = dma_alloc_coherent(&pdev->dev, rx_ring->size,
                                           &rx_ring->dma, GFP_KERNEL);

        if (!rx_ring->desc) {
                hw_dbg(&adapter->hw,
                       "Unable to allocate memory for "
                       "the receive descriptor ring\n");
                vfree(rx_ring->rx_buffer_info);
                rx_ring->rx_buffer_info = NULL;
                goto alloc_failed;
        }

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

        return 0;
alloc_failed:
        return -ENOMEM;
}

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

        for (i = 0; i < adapter->num_rx_queues; i++) {
                err = ixgbevf_setup_rx_resources(adapter, &adapter->rx_ring[i]);
                if (!err)
                        continue;
                hw_dbg(&adapter->hw,
                       "Allocation for Rx Queue %u failed\n", i);
                break;
        }
        return err;
}

/**
 * ixgbevf_free_rx_resources - Free Rx Resources
 * @adapter: board private structure
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/
void ixgbevf_free_rx_resources(struct ixgbevf_adapter *adapter,
                               struct ixgbevf_ring *rx_ring)
{
        struct pci_dev *pdev = adapter->pdev;

        ixgbevf_clean_rx_ring(adapter, rx_ring);

        vfree(rx_ring->rx_buffer_info);
        rx_ring->rx_buffer_info = NULL;

        dma_free_coherent(&pdev->dev, rx_ring->size, rx_ring->desc,
                          rx_ring->dma);

        rx_ring->desc = NULL;
}

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

        for (i = 0; i < adapter->num_rx_queues; i++)
                if (adapter->rx_ring[i].desc)
                        ixgbevf_free_rx_resources(adapter,
                                                  &adapter->rx_ring[i]);
}

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

        /* disallow open during test */
        if (test_bit(__IXGBEVF_TESTING, &adapter->state))
                return -EBUSY;

        if (hw->adapter_stopped) {
                ixgbevf_reset(adapter);
                /* if adapter is still stopped then PF isn't up and
                 * the vf can't start. */
                if (hw->adapter_stopped) {
                        err = IXGBE_ERR_MBX;
                        printk(KERN_ERR "Unable to start - perhaps the PF"
                               " Driver isn't up yet\n");
                        goto err_setup_reset;
                }
        }

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

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

        ixgbevf_configure(adapter);

        /*
         * Map the Tx/Rx rings to the vectors we were allotted.
         * if request_irq will be called in this function map_rings
         * must be called *before* up_complete
         */
        ixgbevf_map_rings_to_vectors(adapter);

        err = ixgbevf_up_complete(adapter);
        if (err)
                goto err_up;

        /* clear any pending interrupts, may auto mask */
        IXGBE_READ_REG(hw, IXGBE_VTEICR);
        err = ixgbevf_request_irq(adapter);
        if (err)
                goto err_req_irq;

        ixgbevf_irq_enable(adapter, true, true);

        return 0;

err_req_irq:
        ixgbevf_down(adapter);
err_up:
        ixgbevf_free_irq(adapter);
err_setup_rx:
        ixgbevf_free_all_rx_resources(adapter);
err_setup_tx:
        ixgbevf_free_all_tx_resources(adapter);
        ixgbevf_reset(adapter);

err_setup_reset:

        return err;
}

/**
 * ixgbevf_close - Disables a network interface
 * @netdev: network interface device structure
 *
 * Returns 0, this is not allowed to fail
 *
 * The close entry point is called when an interface is de-activated
 * by the OS.  The hardware is still under the drivers control, but
 * needs to be disabled.  A global MAC reset is issued to stop the
 * hardware, and all transmit and receive resources are freed.
 **/
static int ixgbevf_close(struct net_device *netdev)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);

        ixgbevf_down(adapter);
        ixgbevf_free_irq(adapter);

        ixgbevf_free_all_tx_resources(adapter);
        ixgbevf_free_all_rx_resources(adapter);

        return 0;
}

static int ixgbevf_tso(struct ixgbevf_adapter *adapter,
                       struct ixgbevf_ring *tx_ring,
                       struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
{
        struct ixgbe_adv_tx_context_desc *context_desc;
        unsigned int i;
        int err;
        struct ixgbevf_tx_buffer *tx_buffer_info;
        u32 vlan_macip_lens = 0, type_tucmd_mlhl;
        u32 mss_l4len_idx, l4len;

        if (skb_is_gso(skb)) {
                if (skb_header_cloned(skb)) {
                        err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
                        if (err)
                                return err;
                }
                l4len = tcp_hdrlen(skb);
                *hdr_len += l4len;

                if (skb->protocol == htons(ETH_P_IP)) {
                        struct iphdr *iph = ip_hdr(skb);
                        iph->tot_len = 0;
                        iph->check = 0;
                        tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
                                                                 iph->daddr, 0,
                                                                 IPPROTO_TCP,
                                                                 0);
                        adapter->hw_tso_ctxt++;
                } else if (skb_is_gso_v6(skb)) {
                        ipv6_hdr(skb)->payload_len = 0;
                        tcp_hdr(skb)->check =
                            ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                                             &ipv6_hdr(skb)->daddr,
                                             0, IPPROTO_TCP, 0);
                        adapter->hw_tso6_ctxt++;
                }

                i = tx_ring->next_to_use;

                tx_buffer_info = &tx_ring->tx_buffer_info[i];
                context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);

                /* VLAN MACLEN IPLEN */
                if (tx_flags & IXGBE_TX_FLAGS_VLAN)
                        vlan_macip_lens |=
                                (tx_flags & IXGBE_TX_FLAGS_VLAN_MASK);
                vlan_macip_lens |= ((skb_network_offset(skb)) <<
                                    IXGBE_ADVTXD_MACLEN_SHIFT);
                *hdr_len += skb_network_offset(skb);
                vlan_macip_lens |=
                        (skb_transport_header(skb) - skb_network_header(skb));
                *hdr_len +=
                        (skb_transport_header(skb) - skb_network_header(skb));
                context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
                context_desc->seqnum_seed = 0;

                /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
                type_tucmd_mlhl = (IXGBE_TXD_CMD_DEXT |
                                    IXGBE_ADVTXD_DTYP_CTXT);

                if (skb->protocol == htons(ETH_P_IP))
                        type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_IPV4;
                type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
                context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);

                /* MSS L4LEN IDX */
                mss_l4len_idx =
                        (skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT);
                mss_l4len_idx |= (l4len << IXGBE_ADVTXD_L4LEN_SHIFT);
                /* use index 1 for TSO */
                mss_l4len_idx |= (1 << IXGBE_ADVTXD_IDX_SHIFT);
                context_desc->mss_l4len_idx = cpu_to_le32(mss_l4len_idx);

                tx_buffer_info->time_stamp = jiffies;
                tx_buffer_info->next_to_watch = i;

                i++;
                if (i == tx_ring->count)
                        i = 0;
                tx_ring->next_to_use = i;

                return true;
        }

        return false;
}

static bool ixgbevf_tx_csum(struct ixgbevf_adapter *adapter,
                            struct ixgbevf_ring *tx_ring,
                            struct sk_buff *skb, u32 tx_flags)
{
        struct ixgbe_adv_tx_context_desc *context_desc;
        unsigned int i;
        struct ixgbevf_tx_buffer *tx_buffer_info;
        u32 vlan_macip_lens = 0, type_tucmd_mlhl = 0;

        if (skb->ip_summed == CHECKSUM_PARTIAL ||
            (tx_flags & IXGBE_TX_FLAGS_VLAN)) {
                i = tx_ring->next_to_use;
                tx_buffer_info = &tx_ring->tx_buffer_info[i];
                context_desc = IXGBE_TX_CTXTDESC_ADV(*tx_ring, i);

                if (tx_flags & IXGBE_TX_FLAGS_VLAN)
                        vlan_macip_lens |= (tx_flags &
                                            IXGBE_TX_FLAGS_VLAN_MASK);
                vlan_macip_lens |= (skb_network_offset(skb) <<
                                    IXGBE_ADVTXD_MACLEN_SHIFT);
                if (skb->ip_summed == CHECKSUM_PARTIAL)
                        vlan_macip_lens |= (skb_transport_header(skb) -
                                            skb_network_header(skb));

                context_desc->vlan_macip_lens = cpu_to_le32(vlan_macip_lens);
                context_desc->seqnum_seed = 0;

                type_tucmd_mlhl |= (IXGBE_TXD_CMD_DEXT |
                                    IXGBE_ADVTXD_DTYP_CTXT);

                if (skb->ip_summed == CHECKSUM_PARTIAL) {
                        switch (skb->protocol) {
                        case __constant_htons(ETH_P_IP):
                                type_tucmd_mlhl |= IXGBE_ADVTXD_TUCMD_IPV4;
                                if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                                        type_tucmd_mlhl |=
                                            IXGBE_ADVTXD_TUCMD_L4T_TCP;
                                break;
                        case __constant_htons(ETH_P_IPV6):
                                /* XXX what about other V6 headers?? */
                                if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                                        type_tucmd_mlhl |=
                                                IXGBE_ADVTXD_TUCMD_L4T_TCP;
                                break;
                        default:
                                if (unlikely(net_ratelimit())) {
                                        printk(KERN_WARNING
                                               "partial checksum but "
                                               "proto=%x!\n",
                                               skb->protocol);
                                }
                                break;
                        }
                }

                context_desc->type_tucmd_mlhl = cpu_to_le32(type_tucmd_mlhl);
                /* use index zero for tx checksum offload */
                context_desc->mss_l4len_idx = 0;

                tx_buffer_info->time_stamp = jiffies;
                tx_buffer_info->next_to_watch = i;

                adapter->hw_csum_tx_good++;
                i++;
                if (i == tx_ring->count)
                        i = 0;
                tx_ring->next_to_use = i;

                return true;
        }

        return false;
}

static int ixgbevf_tx_map(struct ixgbevf_adapter *adapter,
                          struct ixgbevf_ring *tx_ring,
                          struct sk_buff *skb, u32 tx_flags,
                          unsigned int first)
{
        struct pci_dev *pdev = adapter->pdev;
        struct ixgbevf_tx_buffer *tx_buffer_info;
        unsigned int len;
        unsigned int total = skb->len;
        unsigned int offset = 0, size;
        int count = 0;
        unsigned int nr_frags = skb_shinfo(skb)->nr_frags;
        unsigned int f;
        int i;

        i = tx_ring->next_to_use;

        len = min(skb_headlen(skb), total);
        while (len) {
                tx_buffer_info = &tx_ring->tx_buffer_info[i];
                size = min(len, (unsigned int)IXGBE_MAX_DATA_PER_TXD);

                tx_buffer_info->length = size;
                tx_buffer_info->mapped_as_page = false;
                tx_buffer_info->dma = dma_map_single(&adapter->pdev->dev,
                                                     skb->data + offset,
                                                     size, DMA_TO_DEVICE);
                if (dma_mapping_error(&pdev->dev, tx_buffer_info->dma))
                        goto dma_error;
                tx_buffer_info->time_stamp = jiffies;
                tx_buffer_info->next_to_watch = i;

                len -= size;
                total -= size;
                offset += size;
                count++;
                i++;
                if (i == tx_ring->count)
                        i = 0;
        }

        for (f = 0; f < nr_frags; f++) {
                struct skb_frag_struct *frag;

                frag = &skb_shinfo(skb)->frags[f];
                len = min((unsigned int)frag->size, total);
                offset = frag->page_offset;

                while (len) {
                        tx_buffer_info = &tx_ring->tx_buffer_info[i];
                        size = min(len, (unsigned int)IXGBE_MAX_DATA_PER_TXD);

                        tx_buffer_info->length = size;
                        tx_buffer_info->dma = dma_map_page(&adapter->pdev->dev,
                                                           frag->page,
                                                           offset,
                                                           size,
                                                           DMA_TO_DEVICE);
                        tx_buffer_info->mapped_as_page = true;
                        if (dma_mapping_error(&pdev->dev, tx_buffer_info->dma))
                                goto dma_error;
                        tx_buffer_info->time_stamp = jiffies;
                        tx_buffer_info->next_to_watch = i;

                        len -= size;
                        total -= size;
                        offset += size;
                        count++;
                        i++;
                        if (i == tx_ring->count)
                                i = 0;
                }
                if (total == 0)
                        break;
        }

        if (i == 0)
                i = tx_ring->count - 1;
        else
                i = i - 1;
        tx_ring->tx_buffer_info[i].skb = skb;
        tx_ring->tx_buffer_info[first].next_to_watch = i;

        return count;

dma_error:
        dev_err(&pdev->dev, "TX DMA map failed\n");

        /* clear timestamp and dma mappings for failed tx_buffer_info map */
        tx_buffer_info->dma = 0;
        tx_buffer_info->time_stamp = 0;
        tx_buffer_info->next_to_watch = 0;
        count--;