// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2009 - 2018 Intel Corporation. */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/types.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/vmalloc.h>
#include <linux/pagemap.h>
#include <linux/delay.h>
#include <linux/netdevice.h>
#include <linux/tcp.h>
#include <linux/ipv6.h>
#include <linux/slab.h>
#include <net/checksum.h>
#include <net/ip6_checksum.h>
#include <linux/mii.h>
#include <linux/ethtool.h>
#include <linux/if_vlan.h>
#include <linux/prefetch.h>
#include <linux/sctp.h>

#include "igbvf.h"

char igbvf_driver_name[] = "igbvf";
static const char igbvf_driver_string[] =
                  "Intel(R) Gigabit Virtual Function Network Driver";
static const char igbvf_copyright[] =
                  "Copyright (c) 2009 - 2012 Intel Corporation.";

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

static int igbvf_poll(struct napi_struct *napi, int budget);
static void igbvf_reset(struct igbvf_adapter *);
static void igbvf_set_interrupt_capability(struct igbvf_adapter *);
static void igbvf_reset_interrupt_capability(struct igbvf_adapter *);

static struct igbvf_info igbvf_vf_info = {
        .mac            = e1000_vfadapt,
        .flags          = 0,
        .pba            = 10,
        .init_ops       = e1000_init_function_pointers_vf,
};

static struct igbvf_info igbvf_i350_vf_info = {
        .mac            = e1000_vfadapt_i350,
        .flags          = 0,
        .pba            = 10,
        .init_ops       = e1000_init_function_pointers_vf,
};

static const struct igbvf_info *igbvf_info_tbl[] = {
        [board_vf]      = &igbvf_vf_info,
        [board_i350_vf] = &igbvf_i350_vf_info,
};

/**
 * igbvf_desc_unused - calculate if we have unused descriptors
 * @rx_ring: address of receive ring structure
 **/
static int igbvf_desc_unused(struct igbvf_ring *ring)
{
        if (ring->next_to_clean > ring->next_to_use)
                return ring->next_to_clean - ring->next_to_use - 1;

        return ring->count + ring->next_to_clean - ring->next_to_use - 1;
}

/**
 * igbvf_receive_skb - helper function to handle Rx indications
 * @adapter: board private structure
 * @status: descriptor status field as written by hardware
 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 * @skb: pointer to sk_buff to be indicated to stack
 **/
static void igbvf_receive_skb(struct igbvf_adapter *adapter,
                              struct net_device *netdev,
                              struct sk_buff *skb,
                              u32 status, u16 vlan)
{
        u16 vid;

        if (status & E1000_RXD_STAT_VP) {
                if ((adapter->flags & IGBVF_FLAG_RX_LB_VLAN_BSWAP) &&
                    (status & E1000_RXDEXT_STATERR_LB))
                        vid = be16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
                else
                        vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
                if (test_bit(vid, adapter->active_vlans))
                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
        }

        napi_gro_receive(&adapter->rx_ring->napi, skb);
}

static inline void igbvf_rx_checksum_adv(struct igbvf_adapter *adapter,
                                         u32 status_err, struct sk_buff *skb)
{
        skb_checksum_none_assert(skb);

        /* Ignore Checksum bit is set or checksum is disabled through ethtool */
        if ((status_err & E1000_RXD_STAT_IXSM) ||
            (adapter->flags & IGBVF_FLAG_RX_CSUM_DISABLED))
                return;

        /* TCP/UDP checksum error bit is set */
        if (status_err &
            (E1000_RXDEXT_STATERR_TCPE | E1000_RXDEXT_STATERR_IPE)) {
                /* let the stack verify checksum errors */
                adapter->hw_csum_err++;
                return;
        }

        /* It must be a TCP or UDP packet with a valid checksum */
        if (status_err & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS))
                skb->ip_summed = CHECKSUM_UNNECESSARY;

        adapter->hw_csum_good++;
}

/**
 * igbvf_alloc_rx_buffers - Replace used receive buffers; packet split
 * @rx_ring: address of ring structure to repopulate
 * @cleaned_count: number of buffers to repopulate
 **/
static void igbvf_alloc_rx_buffers(struct igbvf_ring *rx_ring,
                                   int cleaned_count)
{
        struct igbvf_adapter *adapter = rx_ring->adapter;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        union e1000_adv_rx_desc *rx_desc;
        struct igbvf_buffer *buffer_info;
        struct sk_buff *skb;
        unsigned int i;
        int bufsz;

        i = rx_ring->next_to_use;
        buffer_info = &rx_ring->buffer_info[i];

        if (adapter->rx_ps_hdr_size)
                bufsz = adapter->rx_ps_hdr_size;
        else
                bufsz = adapter->rx_buffer_len;

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

                if (adapter->rx_ps_hdr_size && !buffer_info->page_dma) {
                        if (!buffer_info->page) {
                                buffer_info->page = alloc_page(GFP_ATOMIC);
                                if (!buffer_info->page) {
                                        adapter->alloc_rx_buff_failed++;
                                        goto no_buffers;
                                }
                                buffer_info->page_offset = 0;
                        } else {
                                buffer_info->page_offset ^= PAGE_SIZE / 2;
                        }
                        buffer_info->page_dma =
                                dma_map_page(&pdev->dev, buffer_info->page,
                                             buffer_info->page_offset,
                                             PAGE_SIZE / 2,
                                             DMA_FROM_DEVICE);
                        if (dma_mapping_error(&pdev->dev,
                                              buffer_info->page_dma)) {
                                __free_page(buffer_info->page);
                                buffer_info->page = NULL;
                                dev_err(&pdev->dev, "RX DMA map failed\n");
                                break;
                        }
                }

                if (!buffer_info->skb) {
                        skb = netdev_alloc_skb_ip_align(netdev, bufsz);
                        if (!skb) {
                                adapter->alloc_rx_buff_failed++;
                                goto no_buffers;
                        }

                        buffer_info->skb = skb;
                        buffer_info->dma = dma_map_single(&pdev->dev, skb->data,
                                                          bufsz,
                                                          DMA_FROM_DEVICE);
                        if (dma_mapping_error(&pdev->dev, buffer_info->dma)) {
                                dev_kfree_skb(buffer_info->skb);
                                buffer_info->skb = NULL;
                                dev_err(&pdev->dev, "RX DMA map failed\n");
                                goto no_buffers;
                        }
                }
                /* Refresh the desc even if buffer_addrs didn't change because
                 * each write-back erases this info.
                 */
                if (adapter->rx_ps_hdr_size) {
                        rx_desc->read.pkt_addr =
                             cpu_to_le64(buffer_info->page_dma);
                        rx_desc->read.hdr_addr = cpu_to_le64(buffer_info->dma);
                } else {
                        rx_desc->read.pkt_addr = cpu_to_le64(buffer_info->dma);
                        rx_desc->read.hdr_addr = 0;
                }

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

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

/**
 * igbvf_clean_rx_irq - Send received data up the network stack; legacy
 * @adapter: board private structure
 *
 * the return value indicates whether actual cleaning was done, there
 * is no guarantee that everything was cleaned
 **/
static bool igbvf_clean_rx_irq(struct igbvf_adapter *adapter,
                               int *work_done, int work_to_do)
{
        struct igbvf_ring *rx_ring = adapter->rx_ring;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;
        union e1000_adv_rx_desc *rx_desc, *next_rxd;
        struct igbvf_buffer *buffer_info, *next_buffer;
        struct sk_buff *skb;
        bool cleaned = false;
        int cleaned_count = 0;
        unsigned int total_bytes = 0, total_packets = 0;
        unsigned int i;
        u32 length, hlen, staterr;

        i = rx_ring->next_to_clean;
        rx_desc = IGBVF_RX_DESC_ADV(*rx_ring, i);
        staterr = le32_to_cpu(rx_desc->wb.upper.status_error);

        while (staterr & E1000_RXD_STAT_DD) {
                if (*work_done >= work_to_do)
                        break;
                (*work_done)++;
                rmb(); /* read descriptor and rx_buffer_info after status DD */

                buffer_info = &rx_ring->buffer_info[i];

                /* HW will not DMA in data larger than the given buffer, even
                 * if it parses the (NFS, of course) header to be larger.  In
                 * that case, it fills the header buffer and spills the rest
                 * into the page.
                 */
                hlen = (le16_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.hdr_info)
                       & E1000_RXDADV_HDRBUFLEN_MASK) >>
                       E1000_RXDADV_HDRBUFLEN_SHIFT;
                if (hlen > adapter->rx_ps_hdr_size)
                        hlen = adapter->rx_ps_hdr_size;

                length = le16_to_cpu(rx_desc->wb.upper.length);
                cleaned = true;
                cleaned_count++;

                skb = buffer_info->skb;
                prefetch(skb->data - NET_IP_ALIGN);
                buffer_info->skb = NULL;
                if (!adapter->rx_ps_hdr_size) {
                        dma_unmap_single(&pdev->dev, buffer_info->dma,
                                         adapter->rx_buffer_len,
                                         DMA_FROM_DEVICE);
                        buffer_info->dma = 0;
                        skb_put(skb, length);
                        goto send_up;
                }

                if (!skb_shinfo(skb)->nr_frags) {
                        dma_unmap_single(&pdev->dev, buffer_info->dma,
                                         adapter->rx_ps_hdr_size,
                                         DMA_FROM_DEVICE);
                        buffer_info->dma = 0;
                        skb_put(skb, hlen);
                }

                if (length) {
                        dma_unmap_page(&pdev->dev, buffer_info->page_dma,
                                       PAGE_SIZE / 2,
                                       DMA_FROM_DEVICE);
                        buffer_info->page_dma = 0;

                        skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
                                           buffer_info->page,
                                           buffer_info->page_offset,
                                           length);

                        if ((adapter->rx_buffer_len > (PAGE_SIZE / 2)) ||
                            (page_count(buffer_info->page) != 1))
                                buffer_info->page = NULL;
                        else
                                get_page(buffer_info->page);

                        skb->len += length;
                        skb->data_len += length;
                        skb->truesize += PAGE_SIZE / 2;
                }
send_up:
                i++;
                if (i == rx_ring->count)
                        i = 0;
                next_rxd = IGBVF_RX_DESC_ADV(*rx_ring, i);
                prefetch(next_rxd);
                next_buffer = &rx_ring->buffer_info[i];

                if (!(staterr & E1000_RXD_STAT_EOP)) {
                        buffer_info->skb = next_buffer->skb;
                        buffer_info->dma = next_buffer->dma;
                        next_buffer->skb = skb;
                        next_buffer->dma = 0;
                        goto next_desc;
                }

                if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) {
                        dev_kfree_skb_irq(skb);
                        goto next_desc;
                }

                total_bytes += skb->len;
                total_packets++;

                igbvf_rx_checksum_adv(adapter, staterr, skb);

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

                igbvf_receive_skb(adapter, netdev, skb, staterr,
                                  rx_desc->wb.upper.vlan);

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

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

                /* use prefetched values */
                rx_desc = next_rxd;
                buffer_info = next_buffer;

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

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

        if (cleaned_count)
                igbvf_alloc_rx_buffers(rx_ring, cleaned_count);

        adapter->total_rx_packets += total_packets;
        adapter->total_rx_bytes += total_bytes;
        netdev->stats.rx_bytes += total_bytes;
        netdev->stats.rx_packets += total_packets;
        return cleaned;
}

static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
                            struct igbvf_buffer *buffer_info)
{
        if (buffer_info->dma) {
                if (buffer_info->mapped_as_page)
                        dma_unmap_page(&adapter->pdev->dev,
                                       buffer_info->dma,
                                       buffer_info->length,
                                       DMA_TO_DEVICE);
                else
                        dma_unmap_single(&adapter->pdev->dev,
                                         buffer_info->dma,
                                         buffer_info->length,
                                         DMA_TO_DEVICE);
                buffer_info->dma = 0;
        }
        if (buffer_info->skb) {
                dev_kfree_skb_any(buffer_info->skb);
                buffer_info->skb = NULL;
        }
        buffer_info->time_stamp = 0;
}

/**
 * igbvf_setup_tx_resources - allocate Tx resources (Descriptors)
 * @adapter: board private structure
 *
 * Return 0 on success, negative on failure
 **/
int igbvf_setup_tx_resources(struct igbvf_adapter *adapter,
                             struct igbvf_ring *tx_ring)
{
        struct pci_dev *pdev = adapter->pdev;
        int size;

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

        /* round up to nearest 4K */
        tx_ring->size = tx_ring->count * sizeof(union e1000_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->adapter = adapter;
        tx_ring->next_to_use = 0;
        tx_ring->next_to_clean = 0;

        return 0;
err:
        vfree(tx_ring->buffer_info);
        dev_err(&adapter->pdev->dev,
                "Unable to allocate memory for the transmit descriptor ring\n");
        return -ENOMEM;
}

/**
 * igbvf_setup_rx_resources - allocate Rx resources (Descriptors)
 * @adapter: board private structure
 *
 * Returns 0 on success, negative on failure
 **/
int igbvf_setup_rx_resources(struct igbvf_adapter *adapter,
                             struct igbvf_ring *rx_ring)
{
        struct pci_dev *pdev = adapter->pdev;
        int size, desc_len;

        size = sizeof(struct igbvf_buffer) * rx_ring->count;
        rx_ring->buffer_info = vzalloc(size);
        if (!rx_ring->buffer_info)
                goto err;

        desc_len = sizeof(union e1000_adv_rx_desc);

        /* Round up to nearest 4K */
        rx_ring->size = rx_ring->count * desc_len;
        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)
                goto err;

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

        rx_ring->adapter = adapter;

        return 0;

err:
        vfree(rx_ring->buffer_info);
        rx_ring->buffer_info = NULL;
        dev_err(&adapter->pdev->dev,
                "Unable to allocate memory for the receive descriptor ring\n");
        return -ENOMEM;
}

/**
 * igbvf_clean_tx_ring - Free Tx Buffers
 * @tx_ring: ring to be cleaned
 **/
static void igbvf_clean_tx_ring(struct igbvf_ring *tx_ring)
{
        struct igbvf_adapter *adapter = tx_ring->adapter;
        struct igbvf_buffer *buffer_info;
        unsigned long size;
        unsigned int i;

        if (!tx_ring->buffer_info)
                return;

        /* Free all the Tx ring sk_buffs */
        for (i = 0; i < tx_ring->count; i++) {
                buffer_info = &tx_ring->buffer_info[i];
                igbvf_put_txbuf(adapter, buffer_info);
        }

        size = sizeof(struct igbvf_buffer) * tx_ring->count;
        memset(tx_ring->buffer_info, 0, size);

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

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

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

/**
 * igbvf_free_tx_resources - Free Tx Resources per Queue
 * @tx_ring: ring to free resources from
 *
 * Free all transmit software resources
 **/
void igbvf_free_tx_resources(struct igbvf_ring *tx_ring)
{
        struct pci_dev *pdev = tx_ring->adapter->pdev;

        igbvf_clean_tx_ring(tx_ring);

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

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

        tx_ring->desc = NULL;
}

/**
 * igbvf_clean_rx_ring - Free Rx Buffers per Queue
 * @adapter: board private structure
 **/
static void igbvf_clean_rx_ring(struct igbvf_ring *rx_ring)
{
        struct igbvf_adapter *adapter = rx_ring->adapter;
        struct igbvf_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        unsigned long size;
        unsigned int i;

        if (!rx_ring->buffer_info)
                return;

        /* Free all the Rx ring sk_buffs */
        for (i = 0; i < rx_ring->count; i++) {
                buffer_info = &rx_ring->buffer_info[i];
                if (buffer_info->dma) {
                        if (adapter->rx_ps_hdr_size) {
                                dma_unmap_single(&pdev->dev, buffer_info->dma,
                                                 adapter->rx_ps_hdr_size,
                                                 DMA_FROM_DEVICE);
                        } else {
                                dma_unmap_single(&pdev->dev, buffer_info->dma,
                                                 adapter->rx_buffer_len,
                                                 DMA_FROM_DEVICE);
                        }
                        buffer_info->dma = 0;
                }

                if (buffer_info->skb) {
                        dev_kfree_skb(buffer_info->skb);
                        buffer_info->skb = NULL;
                }

                if (buffer_info->page) {
                        if (buffer_info->page_dma)
                                dma_unmap_page(&pdev->dev,
                                               buffer_info->page_dma,
                                               PAGE_SIZE / 2,
                                               DMA_FROM_DEVICE);
                        put_page(buffer_info->page);
                        buffer_info->page = NULL;
                        buffer_info->page_dma = 0;
                        buffer_info->page_offset = 0;
                }
        }

        size = sizeof(struct igbvf_buffer) * rx_ring->count;
        memset(rx_ring->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;

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

/**
 * igbvf_free_rx_resources - Free Rx Resources
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/

void igbvf_free_rx_resources(struct igbvf_ring *rx_ring)
{
        struct pci_dev *pdev = rx_ring->adapter->pdev;

        igbvf_clean_rx_ring(rx_ring);

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

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

/**
 * igbvf_update_itr - update the dynamic ITR value based on statistics
 * @adapter: pointer to adapter
 * @itr_setting: current adapter->itr
 * @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 enum latency_range igbvf_update_itr(struct igbvf_adapter *adapter,
                                           enum latency_range itr_setting,
                                           int packets, int bytes)
{
        enum latency_range retval = itr_setting;

        if (packets == 0)
                goto update_itr_done;

        switch (itr_setting) {
        case lowest_latency:
                /* handle TSO and jumbo frames */
                if (bytes/packets > 8000)
                        retval = bulk_latency;
                else if ((packets < 5) && (bytes > 512))
                        retval = low_latency;
                break;
        case low_latency:  /* 50 usec aka 20000 ints/s */
                if (bytes > 10000) {
                        /* this if handles the TSO accounting */
                        if (bytes/packets > 8000)
                                retval = bulk_latency;
                        else if ((packets < 10) || ((bytes/packets) > 1200))
                                retval = bulk_latency;
                        else if ((packets > 35))
                                retval = lowest_latency;
                } else if (bytes/packets > 2000) {
                        retval = bulk_latency;
                } else if (packets <= 2 && bytes < 512) {
                        retval = lowest_latency;
                }
                break;
        case bulk_latency: /* 250 usec aka 4000 ints/s */
                if (bytes > 25000) {
                        if (packets > 35)
                                retval = low_latency;
                } else if (bytes < 6000) {
                        retval = low_latency;
                }
                break;
        default:
                break;
        }

update_itr_done:
        return retval;
}

static int igbvf_range_to_itr(enum latency_range current_range)
{
        int new_itr;

        switch (current_range) {
        /* counts and packets in update_itr are dependent on these numbers */
        case lowest_latency:
                new_itr = IGBVF_70K_ITR;
                break;
        case low_latency:
                new_itr = IGBVF_20K_ITR;
                break;
        case bulk_latency:
                new_itr = IGBVF_4K_ITR;
                break;
        default:
                new_itr = IGBVF_START_ITR;
                break;
        }
        return new_itr;
}

static void igbvf_set_itr(struct igbvf_adapter *adapter)
{
        u32 new_itr;

        adapter->tx_ring->itr_range =
                        igbvf_update_itr(adapter,
                                         adapter->tx_ring->itr_val,
                                         adapter->total_tx_packets,
                                         adapter->total_tx_bytes);

        /* conservative mode (itr 3) eliminates the lowest_latency setting */
        if (adapter->requested_itr == 3 &&
            adapter->tx_ring->itr_range == lowest_latency)
                adapter->tx_ring->itr_range = low_latency;

        new_itr = igbvf_range_to_itr(adapter->tx_ring->itr_range);

        if (new_itr != adapter->tx_ring->itr_val) {
                u32 current_itr = adapter->tx_ring->itr_val;
                /* this attempts to bias the interrupt rate towards Bulk
                 * by adding intermediate steps when interrupt rate is
                 * increasing
                 */
                new_itr = new_itr > current_itr ?
                          min(current_itr + (new_itr >> 2), new_itr) :
                          new_itr;
                adapter->tx_ring->itr_val = new_itr;

                adapter->tx_ring->set_itr = 1;
        }

        adapter->rx_ring->itr_range =
                        igbvf_update_itr(adapter, adapter->rx_ring->itr_val,
                                         adapter->total_rx_packets,
                                         adapter->total_rx_bytes);
        if (adapter->requested_itr == 3 &&
            adapter->rx_ring->itr_range == lowest_latency)
                adapter->rx_ring->itr_range = low_latency;

        new_itr = igbvf_range_to_itr(adapter->rx_ring->itr_range);

        if (new_itr != adapter->rx_ring->itr_val) {
                u32 current_itr = adapter->rx_ring->itr_val;

                new_itr = new_itr > current_itr ?
                          min(current_itr + (new_itr >> 2), new_itr) :
                          new_itr;
                adapter->rx_ring->itr_val = new_itr;

                adapter->rx_ring->set_itr = 1;
        }
}

/**
 * igbvf_clean_tx_irq - Reclaim resources after transmit completes
 * @adapter: board private structure
 *
 * returns true if ring is completely cleaned
 **/
static bool igbvf_clean_tx_irq(struct igbvf_ring *tx_ring)
{
        struct igbvf_adapter *adapter = tx_ring->adapter;
        struct net_device *netdev = adapter->netdev;
        struct igbvf_buffer *buffer_info;
        struct sk_buff *skb;
        union e1000_adv_tx_desc *tx_desc, *eop_desc;
        unsigned int total_bytes = 0, total_packets = 0;
        unsigned int i, count = 0;
        bool cleaned = false;

        i = tx_ring->next_to_clean;
        buffer_info = &tx_ring->buffer_info[i];
        eop_desc = buffer_info->next_to_watch;

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

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

                /* if DD is not set pending work has not been completed */
                if (!(eop_desc->wb.status & cpu_to_le32(E1000_TXD_STAT_DD)))
                        break;

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

                for (cleaned = false; !cleaned; count++) {
                        tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
                        cleaned = (tx_desc == eop_desc);
                        skb = buffer_info->skb;

                        if (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;
                        }

                        igbvf_put_txbuf(adapter, buffer_info);
                        tx_desc->wb.status = 0;

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

                        buffer_info = &tx_ring->buffer_info[i];
                }

                eop_desc = buffer_info->next_to_watch;
        } while (count < tx_ring->count);

        tx_ring->next_to_clean = i;

        if (unlikely(count && netif_carrier_ok(netdev) &&
            igbvf_desc_unused(tx_ring) >= IGBVF_TX_QUEUE_WAKE)) {
                /* Make sure that anybody stopping the queue after this
                 * sees the new next_to_clean.
                 */
                smp_mb();
                if (netif_queue_stopped(netdev) &&
                    !(test_bit(__IGBVF_DOWN, &adapter->state))) {
                        netif_wake_queue(netdev);
                        ++adapter->restart_queue;
                }
        }

        netdev->stats.tx_bytes += total_bytes;
        netdev->stats.tx_packets += total_packets;
        return count < tx_ring->count;
}

static irqreturn_t igbvf_msix_other(int irq, void *data)
{
        struct net_device *netdev = data;
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        adapter->int_counter1++;

        hw->mac.get_link_status = 1;
        if (!test_bit(__IGBVF_DOWN, &adapter->state))
                mod_timer(&adapter->watchdog_timer, jiffies + 1);

        ew32(EIMS, adapter->eims_other);

        return IRQ_HANDLED;
}

static irqreturn_t igbvf_intr_msix_tx(int irq, void *data)
{
        struct net_device *netdev = data;
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct igbvf_ring *tx_ring = adapter->tx_ring;

        if (tx_ring->set_itr) {
                writel(tx_ring->itr_val,
                       adapter->hw.hw_addr + tx_ring->itr_register);
                adapter->tx_ring->set_itr = 0;
        }

        adapter->total_tx_bytes = 0;
        adapter->total_tx_packets = 0;

        /* auto mask will automatically re-enable the interrupt when we write
         * EICS
         */
        if (!igbvf_clean_tx_irq(tx_ring))
                /* Ring was not completely cleaned, so fire another interrupt */
                ew32(EICS, tx_ring->eims_value);
        else
                ew32(EIMS, tx_ring->eims_value);

        return IRQ_HANDLED;
}

static irqreturn_t igbvf_intr_msix_rx(int irq, void *data)
{
        struct net_device *netdev = data;
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        adapter->int_counter0++;

        /* Write the ITR value calculated at the end of the
         * previous interrupt.
         */
        if (adapter->rx_ring->set_itr) {
                writel(adapter->rx_ring->itr_val,
                       adapter->hw.hw_addr + adapter->rx_ring->itr_register);
                adapter->rx_ring->set_itr = 0;
        }

        if (napi_schedule_prep(&adapter->rx_ring->napi)) {
                adapter->total_rx_bytes = 0;
                adapter->total_rx_packets = 0;
                __napi_schedule(&adapter->rx_ring->napi);
        }

        return IRQ_HANDLED;
}

#define IGBVF_NO_QUEUE -1

static void igbvf_assign_vector(struct igbvf_adapter *adapter, int rx_queue,
                                int tx_queue, int msix_vector)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 ivar, index;

        /* 82576 uses a table-based method for assigning vectors.
         * Each queue has a single entry in the table to which we write
         * a vector number along with a "valid" bit.  Sadly, the layout
         * of the table is somewhat counterintuitive.
         */
        if (rx_queue > IGBVF_NO_QUEUE) {
                index = (rx_queue >> 1);
                ivar = array_er32(IVAR0, index);
                if (rx_queue & 0x1) {
                        /* vector goes into third byte of register */
                        ivar = ivar & 0xFF00FFFF;
                        ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
                } else {
                        /* vector goes into low byte of register */
                        ivar = ivar & 0xFFFFFF00;
                        ivar |= msix_vector | E1000_IVAR_VALID;
                }
                adapter->rx_ring[rx_queue].eims_value = BIT(msix_vector);
                array_ew32(IVAR0, index, ivar);
        }
        if (tx_queue > IGBVF_NO_QUEUE) {
                index = (tx_queue >> 1);
                ivar = array_er32(IVAR0, index);
                if (tx_queue & 0x1) {
                        /* vector goes into high byte of register */
                        ivar = ivar & 0x00FFFFFF;
                        ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
                } else {
                        /* vector goes into second byte of register */
                        ivar = ivar & 0xFFFF00FF;
                        ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
                }
                adapter->tx_ring[tx_queue].eims_value = BIT(msix_vector);
                array_ew32(IVAR0, index, ivar);
        }
}

/**
 * igbvf_configure_msix - Configure MSI-X hardware
 * @adapter: board private structure
 *
 * igbvf_configure_msix sets up the hardware to properly
 * generate MSI-X interrupts.
 **/
static void igbvf_configure_msix(struct igbvf_adapter *adapter)
{
        u32 tmp;
        struct e1000_hw *hw = &adapter->hw;
        struct igbvf_ring *tx_ring = adapter->tx_ring;
        struct igbvf_ring *rx_ring = adapter->rx_ring;
        int vector = 0;

        adapter->eims_enable_mask = 0;

        igbvf_assign_vector(adapter, IGBVF_NO_QUEUE, 0, vector++);
        adapter->eims_enable_mask |= tx_ring->eims_value;
        writel(tx_ring->itr_val, hw->hw_addr + tx_ring->itr_register);
        igbvf_assign_vector(adapter, 0, IGBVF_NO_QUEUE, vector++);
        adapter->eims_enable_mask |= rx_ring->eims_value;
        writel(rx_ring->itr_val, hw->hw_addr + rx_ring->itr_register);

        /* set vector for other causes, i.e. link changes */

        tmp = (vector++ | E1000_IVAR_VALID);

        ew32(IVAR_MISC, tmp);

        adapter->eims_enable_mask = GENMASK(vector - 1, 0);
        adapter->eims_other = BIT(vector - 1);
        e1e_flush();
}

static void igbvf_reset_interrupt_capability(struct igbvf_adapter *adapter)
{
        if (adapter->msix_entries) {
                pci_disable_msix(adapter->pdev);

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

/**
 * igbvf_set_interrupt_capability - set MSI or MSI-X if supported
 * @adapter: board private structure
 *
 * Attempt to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static void igbvf_set_interrupt_capability(struct igbvf_adapter *adapter)
{
        int err = -ENOMEM;
        int i;

        /* we allocate 3 vectors, 1 for Tx, 1 for Rx, one for PF messages */
        adapter->msix_entries = kcalloc(3, sizeof(struct msix_entry),
                                        GFP_KERNEL);
        if (adapter->msix_entries) {
                for (i = 0; i < 3; i++)
                        adapter->msix_entries[i].entry = i;

                err = pci_enable_msix_range(adapter->pdev,
                                            adapter->msix_entries, 3, 3);
        }

        if (err < 0) {
                /* MSI-X failed */
                dev_err(&adapter->pdev->dev,
                        "Failed to initialize MSI-X interrupts.\n");
                igbvf_reset_interrupt_capability(adapter);
        }
}

/**
 * igbvf_request_msix - Initialize MSI-X interrupts
 * @adapter: board private structure
 *
 * igbvf_request_msix allocates MSI-X vectors and requests interrupts from the
 * kernel.
 **/
static int igbvf_request_msix(struct igbvf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err = 0, vector = 0;

        if (strlen(netdev->name) < (IFNAMSIZ - 5)) {
                sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name);
                sprintf(adapter->rx_ring->name, "%s-rx-0", netdev->name);
        } else {
                memcpy(adapter->tx_ring->name, netdev->name, IFNAMSIZ);
                memcpy(adapter->rx_ring->name, netdev->name, IFNAMSIZ);
        }

        err = request_irq(adapter->msix_entries[vector].vector,
                          igbvf_intr_msix_tx, 0, adapter->tx_ring->name,
                          netdev);
        if (err)
                goto out;

        adapter->tx_ring->itr_register = E1000_EITR(vector);
        adapter->tx_ring->itr_val = adapter->current_itr;
        vector++;

        err = request_irq(adapter->msix_entries[vector].vector,
                          igbvf_intr_msix_rx, 0, adapter->rx_ring->name,
                          netdev);
        if (err)
                goto out;

        adapter->rx_ring->itr_register = E1000_EITR(vector);
        adapter->rx_ring->itr_val = adapter->current_itr;
        vector++;

        err = request_irq(adapter->msix_entries[vector].vector,
                          igbvf_msix_other, 0, netdev->name, netdev);
        if (err)
                goto out;

        igbvf_configure_msix(adapter);
        return 0;
out:
        return err;
}

/**
 * igbvf_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 **/
static int igbvf_alloc_queues(struct igbvf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;

        adapter->tx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
        if (!adapter->tx_ring)
                return -ENOMEM;

        adapter->rx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
        if (!adapter->rx_ring) {
                kfree(adapter->tx_ring);
                return -ENOMEM;
        }

        netif_napi_add(netdev, &adapter->rx_ring->napi, igbvf_poll, 64);

        return 0;
}

/**
 * igbvf_request_irq - initialize interrupts
 * @adapter: board private structure
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int igbvf_request_irq(struct igbvf_adapter *adapter)
{
        int err = -1;

        /* igbvf supports msi-x only */
        if (adapter->msix_entries)
                err = igbvf_request_msix(adapter);

        if (!err)
                return err;

        dev_err(&adapter->pdev->dev,
                "Unable to allocate interrupt, Error: %d\n", err);

        return err;
}

static void igbvf_free_irq(struct igbvf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int vector;

        if (adapter->msix_entries) {
                for (vector = 0; vector < 3; vector++)
                        free_irq(adapter->msix_entries[vector].vector, netdev);
        }
}

/**
 * igbvf_irq_disable - Mask off interrupt generation on the NIC
 * @adapter: board private structure
 **/
static void igbvf_irq_disable(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        ew32(EIMC, ~0);

        if (adapter->msix_entries)
                ew32(EIAC, 0);
}

/**
 * igbvf_irq_enable - Enable default interrupt generation settings
 * @adapter: board private structure
 **/
static void igbvf_irq_enable(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        ew32(EIAC, adapter->eims_enable_mask);
        ew32(EIAM, adapter->eims_enable_mask);
        ew32(EIMS, adapter->eims_enable_mask);
}

/**
 * igbvf_poll - NAPI Rx polling callback
 * @napi: struct associated with this polling callback
 * @budget: amount of packets driver is allowed to process this poll
 **/
static int igbvf_poll(struct napi_struct *napi, int budget)
{
        struct igbvf_ring *rx_ring = container_of(napi, struct igbvf_ring, napi);
        struct igbvf_adapter *adapter = rx_ring->adapter;
        struct e1000_hw *hw = &adapter->hw;
        int work_done = 0;

        igbvf_clean_rx_irq(adapter, &work_done, budget);

        if (work_done == budget)
                return budget;

        /* Exit the polling mode, but don't re-enable interrupts if stack might
         * poll us due to busy-polling
         */
        if (likely(napi_complete_done(napi, work_done))) {
                if (adapter->requested_itr & 3)
                        igbvf_set_itr(adapter);

                if (!test_bit(__IGBVF_DOWN, &adapter->state))
                        ew32(EIMS, adapter->rx_ring->eims_value);
        }

        return work_done;
}

/**
 * igbvf_set_rlpml - set receive large packet maximum length
 * @adapter: board private structure
 *
 * Configure the maximum size of packets that will be received
 */
static void igbvf_set_rlpml(struct igbvf_adapter *adapter)
{
        int max_frame_size;
        struct e1000_hw *hw = &adapter->hw;

        max_frame_size = adapter->max_frame_size + VLAN_TAG_SIZE;

        spin_lock_bh(&hw->mbx_lock);

        e1000_rlpml_set_vf(hw, max_frame_size);

        spin_unlock_bh(&hw->mbx_lock);
}

static int igbvf_vlan_rx_add_vid(struct net_device *netdev,
                                 __be16 proto, u16 vid)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        spin_lock_bh(&hw->mbx_lock);

        if (hw->mac.ops.set_vfta(hw, vid, true)) {
                dev_err(&adapter->pdev->dev, "Failed to add vlan id %d\n", vid);
                spin_unlock_bh(&hw->mbx_lock);
                return -EINVAL;
        }

        spin_unlock_bh(&hw->mbx_lock);

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

static int igbvf_vlan_rx_kill_vid(struct net_device *netdev,
                                  __be16 proto, u16 vid)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        spin_lock_bh(&hw->mbx_lock);

        if (hw->mac.ops.set_vfta(hw, vid, false)) {
                dev_err(&adapter->pdev->dev,
                        "Failed to remove vlan id %d\n", vid);
                spin_unlock_bh(&hw->mbx_lock);
                return -EINVAL;
        }

        spin_unlock_bh(&hw->mbx_lock);

        clear_bit(vid, adapter->active_vlans);
        return 0;
}

static void igbvf_restore_vlan(struct igbvf_adapter *adapter)
{
        u16 vid;

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

/**
 * igbvf_configure_tx - Configure Transmit Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Tx unit of the MAC after a reset.
 **/
static void igbvf_configure_tx(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct igbvf_ring *tx_ring = adapter->tx_ring;
        u64 tdba;
        u32 txdctl, dca_txctrl;

        /* disable transmits */
        txdctl = er32(TXDCTL(0));
        ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);
        e1e_flush();
        msleep(10);

        /* Setup the HW Tx Head and Tail descriptor pointers */
        ew32(TDLEN(0), tx_ring->count * sizeof(union e1000_adv_tx_desc));
        tdba = tx_ring->dma;
        ew32(TDBAL(0), (tdba & DMA_BIT_MASK(32)));
        ew32(TDBAH(0), (tdba >> 32));
        ew32(TDH(0), 0);
        ew32(TDT(0), 0);
        tx_ring->head = E1000_TDH(0);
        tx_ring->tail = E1000_TDT(0);

        /* Turn off Relaxed Ordering on head write-backs.  The writebacks
         * MUST be delivered in order or it will completely screw up
         * our bookkeeping.
         */
        dca_txctrl = er32(DCA_TXCTRL(0));
        dca_txctrl &= ~E1000_DCA_TXCTRL_TX_WB_RO_EN;
        ew32(DCA_TXCTRL(0), dca_txctrl);

        /* enable transmits */
        txdctl |= E1000_TXDCTL_QUEUE_ENABLE;
        ew32(TXDCTL(0), txdctl);

        /* Setup Transmit Descriptor Settings for eop descriptor */
        adapter->txd_cmd = E1000_ADVTXD_DCMD_EOP | E1000_ADVTXD_DCMD_IFCS;

        /* enable Report Status bit */
        adapter->txd_cmd |= E1000_ADVTXD_DCMD_RS;
}

/**
 * igbvf_setup_srrctl - configure the receive control registers
 * @adapter: Board private structure
 **/
static void igbvf_setup_srrctl(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        u32 srrctl = 0;

        srrctl &= ~(E1000_SRRCTL_DESCTYPE_MASK |
                    E1000_SRRCTL_BSIZEHDR_MASK |
                    E1000_SRRCTL_BSIZEPKT_MASK);

        /* Enable queue drop to avoid head of line blocking */
        srrctl |= E1000_SRRCTL_DROP_EN;

        /* Setup buffer sizes */
        srrctl |= ALIGN(adapter->rx_buffer_len, 1024) >>
                  E1000_SRRCTL_BSIZEPKT_SHIFT;

        if (adapter->rx_buffer_len < 2048) {
                adapter->rx_ps_hdr_size = 0;
                srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
        } else {
                adapter->rx_ps_hdr_size = 128;
                srrctl |= adapter->rx_ps_hdr_size <<
                          E1000_SRRCTL_BSIZEHDRSIZE_SHIFT;
                srrctl |= E1000_SRRCTL_DESCTYPE_HDR_SPLIT_ALWAYS;
        }

        ew32(SRRCTL(0), srrctl);
}

/**
 * igbvf_configure_rx - Configure Receive Unit after Reset
 * @adapter: board private structure
 *
 * Configure the Rx unit of the MAC after a reset.
 **/
static void igbvf_configure_rx(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct igbvf_ring *rx_ring = adapter->rx_ring;
        u64 rdba;
        u32 rxdctl;

        /* disable receives */
        rxdctl = er32(RXDCTL(0));
        ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);
        e1e_flush();
        msleep(10);

        /* Setup the HW Rx Head and Tail Descriptor Pointers and
         * the Base and Length of the Rx Descriptor Ring
         */
        rdba = rx_ring->dma;
        ew32(RDBAL(0), (rdba & DMA_BIT_MASK(32)));
        ew32(RDBAH(0), (rdba >> 32));
        ew32(RDLEN(0), rx_ring->count * sizeof(union e1000_adv_rx_desc));
        rx_ring->head = E1000_RDH(0);
        rx_ring->tail = E1000_RDT(0);
        ew32(RDH(0), 0);
        ew32(RDT(0), 0);

        rxdctl |= E1000_RXDCTL_QUEUE_ENABLE;
        rxdctl &= 0xFFF00000;
        rxdctl |= IGBVF_RX_PTHRESH;
        rxdctl |= IGBVF_RX_HTHRESH << 8;
        rxdctl |= IGBVF_RX_WTHRESH << 16;

        igbvf_set_rlpml(adapter);

        /* enable receives */
        ew32(RXDCTL(0), rxdctl);
}

/**
 * igbvf_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi 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,
 * promiscuous mode, and all-multi behavior.
 **/
static void igbvf_set_multi(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct netdev_hw_addr *ha;
        u8  *mta_list = NULL;
        int i;

        if (!netdev_mc_empty(netdev)) {
                mta_list = kmalloc_array(netdev_mc_count(netdev), ETH_ALEN,
                                         GFP_ATOMIC);
                if (!mta_list)
                        return;
        }

        /* prepare a packed array of only addresses. */
        i = 0;
        netdev_for_each_mc_addr(ha, netdev)
                memcpy(mta_list + (i++ * ETH_ALEN), ha->addr, ETH_ALEN);

        spin_lock_bh(&hw->mbx_lock);

        hw->mac.ops.update_mc_addr_list(hw, mta_list, i, 0, 0);

        spin_unlock_bh(&hw->mbx_lock);
        kfree(mta_list);
}

/**
 * igbvf_set_uni - Configure unicast MAC filters
 * @netdev: network interface device structure
 *
 * This routine is responsible for configuring the hardware for proper
 * unicast filters.
 **/
static int igbvf_set_uni(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

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

        spin_lock_bh(&hw->mbx_lock);

        /* Clear all unicast MAC filters */
        hw->mac.ops.set_uc_addr(hw, E1000_VF_MAC_FILTER_CLR, NULL);

        spin_unlock_bh(&hw->mbx_lock);

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

                /* Add MAC filters one by one */
                netdev_for_each_uc_addr(ha, netdev) {
                        spin_lock_bh(&hw->mbx_lock);

                        hw->mac.ops.set_uc_addr(hw, E1000_VF_MAC_FILTER_ADD,
                                                ha->addr);

                        spin_unlock_bh(&hw->mbx_lock);
                        udelay(200);
                }
        }

        return 0;
}

static void igbvf_set_rx_mode(struct net_device *netdev)
{
        igbvf_set_multi(netdev);
        igbvf_set_uni(netdev);
}

/**
 * igbvf_configure - configure the hardware for Rx and Tx
 * @adapter: private board structure
 **/
static void igbvf_configure(struct igbvf_adapter *adapter)
{
        igbvf_set_rx_mode(adapter->netdev);

        igbvf_restore_vlan(adapter);

        igbvf_configure_tx(adapter);
        igbvf_setup_srrctl(adapter);
        igbvf_configure_rx(adapter);
        igbvf_alloc_rx_buffers(adapter->rx_ring,
                               igbvf_desc_unused(adapter->rx_ring));
}

/* igbvf_reset - bring the hardware into a known good state
 * @adapter: private board structure
 *
 * This function boots the hardware and enables some settings that
 * require a configuration cycle of the hardware - those cannot be
 * set/changed during runtime. After reset the device needs to be
 * properly configured for Rx, Tx etc.
 */
static void igbvf_reset(struct igbvf_adapter *adapter)
{
        struct e1000_mac_info *mac = &adapter->hw.mac;
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;

        spin_lock_bh(&hw->mbx_lock);

        /* Allow time for pending master requests to run */
        if (mac->ops.reset_hw(hw))
                dev_err(&adapter->pdev->dev, "PF still resetting\n");

        mac->ops.init_hw(hw);

        spin_unlock_bh(&hw->mbx_lock);

        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);
        }

        adapter->last_reset = jiffies;
}

int igbvf_up(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        /* hardware has been reset, we need to reload some things */
        igbvf_configure(adapter);

        clear_bit(__IGBVF_DOWN, &adapter->state);

        napi_enable(&adapter->rx_ring->napi);
        if (adapter->msix_entries)
                igbvf_configure_msix(adapter);

        /* Clear any pending interrupts. */
        er32(EICR);
        igbvf_irq_enable(adapter);

        /* start the watchdog */
        hw->mac.get_link_status = 1;
        mod_timer(&adapter->watchdog_timer, jiffies + 1);

        return 0;
}

void igbvf_down(struct igbvf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        struct e1000_hw *hw = &adapter->hw;
        u32 rxdctl, txdctl;

        /* signal that we're down so the interrupt handler does not
         * reschedule our watchdog timer
         */
        set_bit(__IGBVF_DOWN, &adapter->state);

        /* disable receives in the hardware */
        rxdctl = er32(RXDCTL(0));
        ew32(RXDCTL(0), rxdctl & ~E1000_RXDCTL_QUEUE_ENABLE);

        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        /* disable transmits in the hardware */
        txdctl = er32(TXDCTL(0));
        ew32(TXDCTL(0), txdctl & ~E1000_TXDCTL_QUEUE_ENABLE);

        /* flush both disables and wait for them to finish */
        e1e_flush();
        msleep(10);

        napi_disable(&adapter->rx_ring->napi);

        igbvf_irq_disable(adapter);

        del_timer_sync(&adapter->watchdog_timer);

        /* record the stats before reset*/
        igbvf_update_stats(adapter);

        adapter->link_speed = 0;
        adapter->link_duplex = 0;

        igbvf_reset(adapter);
        igbvf_clean_tx_ring(adapter->tx_ring);
        igbvf_clean_rx_ring(adapter->rx_ring);
}

void igbvf_reinit_locked(struct igbvf_adapter *adapter)
{
        might_sleep();
        while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
                usleep_range(1000, 2000);
        igbvf_down(adapter);
        igbvf_up(adapter);
        clear_bit(__IGBVF_RESETTING, &adapter->state);
}

/**
 * igbvf_sw_init - Initialize general software structures (struct igbvf_adapter)
 * @adapter: board private structure to initialize
 *
 * igbvf_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 igbvf_sw_init(struct igbvf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        s32 rc;

        adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
        adapter->rx_ps_hdr_size = 0;
        adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
        adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;

        adapter->tx_int_delay = 8;
        adapter->tx_abs_int_delay = 32;
        adapter->rx_int_delay = 0;
        adapter->rx_abs_int_delay = 8;
        adapter->requested_itr = 3;
        adapter->current_itr = IGBVF_START_ITR;

        /* Set various function pointers */
        adapter->ei->init_ops(&adapter->hw);

        rc = adapter->hw.mac.ops.init_params(&adapter->hw);
        if (rc)
                return rc;

        rc = adapter->hw.mbx.ops.init_params(&adapter->hw);
        if (rc)
                return rc;

        igbvf_set_interrupt_capability(adapter);

        if (igbvf_alloc_queues(adapter))
                return -ENOMEM;

        spin_lock_init(&adapter->tx_queue_lock);

        /* Explicitly disable IRQ since the NIC can be in any state. */
        igbvf_irq_disable(adapter);

        spin_lock_init(&adapter->stats_lock);
        spin_lock_init(&adapter->hw.mbx_lock);

        set_bit(__IGBVF_DOWN, &adapter->state);
        return 0;
}

static void igbvf_initialize_last_counter_stats(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;

        adapter->stats.last_gprc = er32(VFGPRC);
        adapter->stats.last_gorc = er32(VFGORC);
        adapter->stats.last_gptc = er32(VFGPTC);
        adapter->stats.last_gotc = er32(VFGOTC);
        adapter->stats.last_mprc = er32(VFMPRC);
        adapter->stats.last_gotlbc = er32(VFGOTLBC);
        adapter->stats.last_gptlbc = er32(VFGPTLBC);
        adapter->stats.last_gorlbc = er32(VFGORLBC);
        adapter->stats.last_gprlbc = er32(VFGPRLBC);

        adapter->stats.base_gprc = er32(VFGPRC);
        adapter->stats.base_gorc = er32(VFGORC);
        adapter->stats.base_gptc = er32(VFGPTC);
        adapter->stats.base_gotc = er32(VFGOTC);
        adapter->stats.base_mprc = er32(VFMPRC);
        adapter->stats.base_gotlbc = er32(VFGOTLBC);
        adapter->stats.base_gptlbc = er32(VFGPTLBC);
        adapter->stats.base_gorlbc = er32(VFGORLBC);
        adapter->stats.base_gprlbc = er32(VFGPRLBC);
}

/**
 * igbvf_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 igbvf_open(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        int err;

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

        /* allocate transmit descriptors */
        err = igbvf_setup_tx_resources(adapter, adapter->tx_ring);
        if (err)
                goto err_setup_tx;

        /* allocate receive descriptors */
        err = igbvf_setup_rx_resources(adapter, adapter->rx_ring);
        if (err)
                goto err_setup_rx;

        /* before we allocate an interrupt, we must be ready to handle it.
         * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
         * as soon as we call pci_request_irq, so we have to setup our
         * clean_rx handler before we do so.
         */
        igbvf_configure(adapter);

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

        /* From here on the code is the same as igbvf_up() */
        clear_bit(__IGBVF_DOWN, &adapter->state);

        napi_enable(&adapter->rx_ring->napi);

        /* clear any pending interrupts */
        er32(EICR);

        igbvf_irq_enable(adapter);

        /* start the watchdog */
        hw->mac.get_link_status = 1;
        mod_timer(&adapter->watchdog_timer, jiffies + 1);

        return 0;

err_req_irq:
        igbvf_free_rx_resources(adapter->rx_ring);
err_setup_rx:
        igbvf_free_tx_resources(adapter->tx_ring);
err_setup_tx:
        igbvf_reset(adapter);

        return err;
}

/**
 * igbvf_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 igbvf_close(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
        igbvf_down(adapter);

        igbvf_free_irq(adapter);

        igbvf_free_tx_resources(adapter->tx_ring);
        igbvf_free_rx_resources(adapter->rx_ring);

        return 0;
}

/**
 * igbvf_set_mac - Change the Ethernet Address of the NIC
 * @netdev: network interface device structure
 * @p: pointer to an address structure
 *
 * Returns 0 on success, negative on failure
 **/
static int igbvf_set_mac(struct net_device *netdev, void *p)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;
        struct sockaddr *addr = p;

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

        memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);

        spin_lock_bh(&hw->mbx_lock);

        hw->mac.ops.rar_set(hw, hw->mac.addr, 0);

        spin_unlock_bh(&hw->mbx_lock);

        if (!ether_addr_equal(addr->sa_data, hw->mac.addr))
                return -EADDRNOTAVAIL;

        memcpy(netdev->dev_addr, addr->sa_data, netdev->addr_len);

        return 0;
}

#define UPDATE_VF_COUNTER(reg, name) \
{ \
        u32 current_counter = er32(reg); \
        if (current_counter < adapter->stats.last_##name) \
                adapter->stats.name += 0x100000000LL; \
        adapter->stats.last_##name = current_counter; \
        adapter->stats.name &= 0xFFFFFFFF00000000LL; \
        adapter->stats.name |= current_counter; \
}

/**
 * igbvf_update_stats - Update the board statistics counters
 * @adapter: board private structure
**/
void igbvf_update_stats(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct pci_dev *pdev = adapter->pdev;

        /* Prevent stats update while adapter is being reset, link is down
         * or if the pci connection is down.
         */
        if (adapter->link_speed == 0)
                return;

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

        if (pci_channel_offline(pdev))
                return;

        UPDATE_VF_COUNTER(VFGPRC, gprc);
        UPDATE_VF_COUNTER(VFGORC, gorc);
        UPDATE_VF_COUNTER(VFGPTC, gptc);
        UPDATE_VF_COUNTER(VFGOTC, gotc);
        UPDATE_VF_COUNTER(VFMPRC, mprc);
        UPDATE_VF_COUNTER(VFGOTLBC, gotlbc);
        UPDATE_VF_COUNTER(VFGPTLBC, gptlbc);
        UPDATE_VF_COUNTER(VFGORLBC, gorlbc);
        UPDATE_VF_COUNTER(VFGPRLBC, gprlbc);

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

static void igbvf_print_link_info(struct igbvf_adapter *adapter)
{
        dev_info(&adapter->pdev->dev, "Link is Up %d Mbps %s Duplex\n",
                 adapter->link_speed,
                 adapter->link_duplex == FULL_DUPLEX ? "Full" : "Half");
}

static bool igbvf_has_link(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        s32 ret_val = E1000_SUCCESS;
        bool link_active;

        /* If interface is down, stay link down */
        if (test_bit(__IGBVF_DOWN, &adapter->state))
                return false;

        spin_lock_bh(&hw->mbx_lock);

        ret_val = hw->mac.ops.check_for_link(hw);

        spin_unlock_bh(&hw->mbx_lock);

        link_active = !hw->mac.get_link_status;

        /* if check for link returns error we will need to reset */
        if (ret_val && time_after(jiffies, adapter->last_reset + (10 * HZ)))
                schedule_work(&adapter->reset_task);

        return link_active;
}

/**
 * igbvf_watchdog - Timer Call-back
 * @data: pointer to adapter cast into an unsigned long
 **/
static void igbvf_watchdog(struct timer_list *t)
{
        struct igbvf_adapter *adapter = from_timer(adapter, t, watchdog_timer);

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

static void igbvf_watchdog_task(struct work_struct *work)
{
        struct igbvf_adapter *adapter = container_of(work,
                                                     struct igbvf_adapter,
                                                     watchdog_task);
        struct net_device *netdev = adapter->netdev;
        struct e1000_mac_info *mac = &adapter->hw.mac;
        struct igbvf_ring *tx_ring = adapter->tx_ring;
        struct e1000_hw *hw = &adapter->hw;
        u32 link;
        int tx_pending = 0;

        link = igbvf_has_link(adapter);

        if (link) {
                if (!netif_carrier_ok(netdev)) {
                        mac->ops.get_link_up_info(&adapter->hw,
                                                  &adapter->link_speed,
                                                  &adapter->link_duplex);
                        igbvf_print_link_info(adapter);

                        netif_carrier_on(netdev);
                        netif_wake_queue(netdev);
                }
        } else {
                if (netif_carrier_ok(netdev)) {
                        adapter->link_speed = 0;
                        adapter->link_duplex = 0;
                        dev_info(&adapter->pdev->dev, "Link is Down\n");
                        netif_carrier_off(netdev);
                        netif_stop_queue(netdev);
                }
        }

        if (netif_carrier_ok(netdev)) {
                igbvf_update_stats(adapter);
        } else {
                tx_pending = (igbvf_desc_unused(tx_ring) + 1 <
                              tx_ring->count);
                if (tx_pending) {
                        /* We've lost link, so the controller stops DMA,
                         * but we've got queued Tx work that's never going
                         * to get done, so reset controller to flush Tx.
                         * (Do the reset outside of interrupt context).
                         */
                        adapter->tx_timeout_count++;
                        schedule_work(&adapter->reset_task);
                }
        }

        /* Cause software interrupt to ensure Rx ring is cleaned */
        ew32(EICS, adapter->rx_ring->eims_value);

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

#define IGBVF_TX_FLAGS_CSUM             0x00000001
#define IGBVF_TX_FLAGS_VLAN             0x00000002
#define IGBVF_TX_FLAGS_TSO              0x00000004
#define IGBVF_TX_FLAGS_IPV4             0x00000008
#define IGBVF_TX_FLAGS_VLAN_MASK        0xffff0000
#define IGBVF_TX_FLAGS_VLAN_SHIFT       16

static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
                              u32 type_tucmd, u32 mss_l4len_idx)
{
        struct e1000_adv_tx_context_desc *context_desc;
        struct igbvf_buffer *buffer_info;
        u16 i = tx_ring->next_to_use;

        context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
        buffer_info = &tx_ring->buffer_info[i];

        i++;
        tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;

        /* set bits to identify this as an advanced context descriptor */
        type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT;

        context_desc->vlan_macip_lens   = cpu_to_le32(vlan_macip_lens);
        context_desc->seqnum_seed       = 0;
        context_desc->type_tucmd_mlhl   = cpu_to_le32(type_tucmd);
        context_desc->mss_l4len_idx     = cpu_to_le32(mss_l4len_idx);

        buffer_info->time_stamp = jiffies;
        buffer_info->dma = 0;
}

static int igbvf_tso(struct igbvf_ring *tx_ring,
                     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
{
        u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
        union {
                struct iphdr *v4;

                struct ipv6hdr *v6;
                unsigned char *hdr;
        } ip;
        union {
                struct tcphdr *tcp;
                unsigned char *hdr;
        } l4;
        u32 paylen, l4_offset;
        int err;

        if (skb->ip_summed != CHECKSUM_PARTIAL)
                return 0;

        if (!skb_is_gso(skb))
                return 0;

        err = skb_cow_head(skb, 0);
        if (err < 0)
                return err;

        ip.hdr = skb_network_header(skb);
        l4.hdr = skb_checksum_start(skb);

        /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
        type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;

        /* initialize outer IP header fields */
        if (ip.v4->version == 4) {
                unsigned char *csum_start = skb_checksum_start(skb);
                unsigned char *trans_start = ip.hdr + (ip.v4->ihl * 4);

                /* IP header will have to cancel out any data that
                 * is not a part of the outer IP header
                 */
                ip.v4->check = csum_fold(csum_partial(trans_start,
                                                      csum_start - trans_start,
                                                      0));
                type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;

                ip.v4->tot_len = 0;
        } else {
                ip.v6->payload_len = 0;
        }

        /* determine offset of inner transport header */
        l4_offset = l4.hdr - skb->data;

        /* compute length of segmentation header */
        *hdr_len = (l4.tcp->doff * 4) + l4_offset;

        /* remove payload length from inner checksum */
        paylen = skb->len - l4_offset;
        csum_replace_by_diff(&l4.tcp->check, htonl(paylen));

        /* MSS L4LEN IDX */
        mss_l4len_idx = (*hdr_len - l4_offset) << E1000_ADVTXD_L4LEN_SHIFT;
        mss_l4len_idx |= skb_shinfo(skb)->gso_size << E1000_ADVTXD_MSS_SHIFT;

        /* VLAN MACLEN IPLEN */
        vlan_macip_lens = l4.hdr - ip.hdr;
        vlan_macip_lens |= (ip.hdr - skb->data) << E1000_ADVTXD_MACLEN_SHIFT;
        vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;

        igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);

        return 1;
}

static inline bool igbvf_ipv6_csum_is_sctp(struct sk_buff *skb)
{
        unsigned int offset = 0;

        ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);

        return offset == skb_checksum_start_offset(skb);
}

static bool igbvf_tx_csum(struct igbvf_ring *tx_ring, struct sk_buff *skb,
                          u32 tx_flags, __be16 protocol)
{
        u32 vlan_macip_lens = 0;
        u32 type_tucmd = 0;

        if (skb->ip_summed != CHECKSUM_PARTIAL) {
csum_failed:
                if (!(tx_flags & IGBVF_TX_FLAGS_VLAN))
                        return false;
                goto no_csum;
        }

        switch (skb->csum_offset) {
        case offsetof(struct tcphdr, check):
                type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
                fallthrough;
        case offsetof(struct udphdr, check):
                break;
        case offsetof(struct sctphdr, checksum):
                /* validate that this is actually an SCTP request */
                if (((protocol == htons(ETH_P_IP)) &&
                     (ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
                    ((protocol == htons(ETH_P_IPV6)) &&
                     igbvf_ipv6_csum_is_sctp(skb))) {
                        type_tucmd = E1000_ADVTXD_TUCMD_L4T_SCTP;
                        break;
                }
                fallthrough;
        default:
                skb_checksum_help(skb);
                goto csum_failed;
        }

        vlan_macip_lens = skb_checksum_start_offset(skb) -
                          skb_network_offset(skb);
no_csum:
        vlan_macip_lens |= skb_network_offset(skb) << E1000_ADVTXD_MACLEN_SHIFT;
        vlan_macip_lens |= tx_flags & IGBVF_TX_FLAGS_VLAN_MASK;

        igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
        return true;
}

static int igbvf_maybe_stop_tx(struct net_device *netdev, int size)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        /* there is enough descriptors then we don't need to worry  */
        if (igbvf_desc_unused(adapter->tx_ring) >= size)
                return 0;

        netif_stop_queue(netdev);

        /* Herbert's original patch had:
         *  smp_mb__after_netif_stop_queue();
         * but since that doesn't exist yet, just open code it.
         */
        smp_mb();

        /* We need to check again just in case room has been made available */
        if (igbvf_desc_unused(adapter->tx_ring) < size)
                return -EBUSY;

        netif_wake_queue(netdev);

        ++adapter->restart_queue;
        return 0;
}

#define IGBVF_MAX_TXD_PWR       16
#define IGBVF_MAX_DATA_PER_TXD  (1u << IGBVF_MAX_TXD_PWR)

static inline int igbvf_tx_map_adv(struct igbvf_adapter *adapter,
                                   struct igbvf_ring *tx_ring,
                                   struct sk_buff *skb)
{
        struct igbvf_buffer *buffer_info;
        struct pci_dev *pdev = adapter->pdev;
        unsigned int len = skb_headlen(skb);
        unsigned int count = 0, i;
        unsigned int f;

        i = tx_ring->next_to_use;

        buffer_info = &tx_ring->buffer_info[i];
        BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
        buffer_info->length = len;
        /* set time_stamp *before* dma to help avoid a possible race */
        buffer_info->time_stamp = jiffies;
        buffer_info->mapped_as_page = false;
        buffer_info->dma = dma_map_single(&pdev->dev, skb->data, len,
                                          DMA_TO_DEVICE);
        if (dma_mapping_error(&pdev->dev, buffer_info->dma))
                goto dma_error;

        for (f = 0; f < skb_shinfo(skb)->nr_frags; f++) {
                const skb_frag_t *frag;

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

                frag = &skb_shinfo(skb)->frags[f];
                len = skb_frag_size(frag);

                buffer_info = &tx_ring->buffer_info[i];
                BUG_ON(len >= IGBVF_MAX_DATA_PER_TXD);
                buffer_info->length = len;
                buffer_info->time_stamp = jiffies;
                buffer_info->mapped_as_page = true;
                buffer_info->dma = skb_frag_dma_map(&pdev->dev, frag, 0, len,
                                                    DMA_TO_DEVICE);
                if (dma_mapping_error(&pdev->dev, buffer_info->dma))
                        goto dma_error;
        }

        tx_ring->buffer_info[i].skb = skb;

        return ++count;

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

        /* clear timestamp and dma mappings for failed buffer_info mapping */
        buffer_info->dma = 0;
        buffer_info->time_stamp = 0;
        buffer_info->length = 0;
        buffer_info->mapped_as_page = false;
        if (count)
                count--;

        /* clear timestamp and dma mappings for remaining portion of packet */
        while (count--) {
                if (i == 0)
                        i += tx_ring->count;
                i--;
                buffer_info = &tx_ring->buffer_info[i];
                igbvf_put_txbuf(adapter, buffer_info);
        }

        return 0;
}

static inline void igbvf_tx_queue_adv(struct igbvf_adapter *adapter,
                                      struct igbvf_ring *tx_ring,
                                      int tx_flags, int count,
                                      unsigned int first, u32 paylen,
                                      u8 hdr_len)
{
        union e1000_adv_tx_desc *tx_desc = NULL;
        struct igbvf_buffer *buffer_info;
        u32 olinfo_status = 0, cmd_type_len;
        unsigned int i;

        cmd_type_len = (E1000_ADVTXD_DTYP_DATA | E1000_ADVTXD_DCMD_IFCS |
                        E1000_ADVTXD_DCMD_DEXT);

        if (tx_flags & IGBVF_TX_FLAGS_VLAN)
                cmd_type_len |= E1000_ADVTXD_DCMD_VLE;

        if (tx_flags & IGBVF_TX_FLAGS_TSO) {
                cmd_type_len |= E1000_ADVTXD_DCMD_TSE;

                /* insert tcp checksum */
                olinfo_status |= E1000_TXD_POPTS_TXSM << 8;

                /* insert ip checksum */
                if (tx_flags & IGBVF_TX_FLAGS_IPV4)
                        olinfo_status |= E1000_TXD_POPTS_IXSM << 8;

        } else if (tx_flags & IGBVF_TX_FLAGS_CSUM) {
                olinfo_status |= E1000_TXD_POPTS_TXSM << 8;
        }

        olinfo_status |= ((paylen - hdr_len) << E1000_ADVTXD_PAYLEN_SHIFT);

        i = tx_ring->next_to_use;
        while (count--) {
                buffer_info = &tx_ring->buffer_info[i];
                tx_desc = IGBVF_TX_DESC_ADV(*tx_ring, i);
                tx_desc->read.buffer_addr = cpu_to_le64(buffer_info->dma);
                tx_desc->read.cmd_type_len =
                         cpu_to_le32(cmd_type_len | buffer_info->length);
                tx_desc->read.olinfo_status = cpu_to_le32(olinfo_status);
                i++;
                if (i == tx_ring->count)
                        i = 0;
        }

        tx_desc->read.cmd_type_len |= cpu_to_le32(adapter->txd_cmd);
        /* 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();

        tx_ring->buffer_info[first].next_to_watch = tx_desc;
        tx_ring->next_to_use = i;
        writel(i, adapter->hw.hw_addr + tx_ring->tail);
}

static netdev_tx_t igbvf_xmit_frame_ring_adv(struct sk_buff *skb,
                                             struct net_device *netdev,
                                             struct igbvf_ring *tx_ring)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        unsigned int first, tx_flags = 0;
        u8 hdr_len = 0;
        int count = 0;
        int tso = 0;
        __be16 protocol = vlan_get_protocol(skb);

        if (test_bit(__IGBVF_DOWN, &adapter->state)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (skb->len <= 0) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        /* need: count + 4 desc gap to keep tail from touching
         *       + 2 desc gap to keep tail from touching head,
         *       + 1 desc for skb->data,
         *       + 1 desc for context descriptor,
         * head, otherwise try next time
         */
        if (igbvf_maybe_stop_tx(netdev, skb_shinfo(skb)->nr_frags + 4)) {
                /* this is a hard error */
                return NETDEV_TX_BUSY;
        }

        if (skb_vlan_tag_present(skb)) {
                tx_flags |= IGBVF_TX_FLAGS_VLAN;
                tx_flags |= (skb_vlan_tag_get(skb) <<
                             IGBVF_TX_FLAGS_VLAN_SHIFT);
        }

        if (protocol == htons(ETH_P_IP))
                tx_flags |= IGBVF_TX_FLAGS_IPV4;

        first = tx_ring->next_to_use;

        tso = igbvf_tso(tx_ring, skb, tx_flags, &hdr_len);
        if (unlikely(tso < 0)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        if (tso)
                tx_flags |= IGBVF_TX_FLAGS_TSO;
        else if (igbvf_tx_csum(tx_ring, skb, tx_flags, protocol) &&
                 (skb->ip_summed == CHECKSUM_PARTIAL))
                tx_flags |= IGBVF_TX_FLAGS_CSUM;

        /* count reflects descriptors mapped, if 0 then mapping error
         * has occurred and we need to rewind the descriptor queue
         */
        count = igbvf_tx_map_adv(adapter, tx_ring, skb);

        if (count) {
                igbvf_tx_queue_adv(adapter, tx_ring, tx_flags, count,
                                   first, skb->len, hdr_len);
                /* Make sure there is space in the ring for the next send. */
                igbvf_maybe_stop_tx(netdev, MAX_SKB_FRAGS + 4);
        } else {
                dev_kfree_skb_any(skb);
                tx_ring->buffer_info[first].time_stamp = 0;
                tx_ring->next_to_use = first;
        }

        return NETDEV_TX_OK;
}

static netdev_tx_t igbvf_xmit_frame(struct sk_buff *skb,
                                    struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct igbvf_ring *tx_ring;

        if (test_bit(__IGBVF_DOWN, &adapter->state)) {
                dev_kfree_skb_any(skb);
                return NETDEV_TX_OK;
        }

        tx_ring = &adapter->tx_ring[0];

        return igbvf_xmit_frame_ring_adv(skb, netdev, tx_ring);
}

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

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

static void igbvf_reset_task(struct work_struct *work)
{
        struct igbvf_adapter *adapter;

        adapter = container_of(work, struct igbvf_adapter, reset_task);

        igbvf_reinit_locked(adapter);
}

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

        while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
                usleep_range(1000, 2000);
        /* igbvf_down has a dependency on max_frame_size */
        adapter->max_frame_size = max_frame;
        if (netif_running(netdev))
                igbvf_down(adapter);

        /* NOTE: netdev_alloc_skb reserves 16 bytes, and typically NET_IP_ALIGN
         * means we reserve 2 more, this pushes us to allocate from the next
         * larger slab size.
         * i.e. RXBUFFER_2048 --> size-4096 slab
         * However with the new *_jumbo_rx* routines, jumbo receives will use
         * fragmented skbs
         */

        if (max_frame <= 1024)
                adapter->rx_buffer_len = 1024;
        else if (max_frame <= 2048)
                adapter->rx_buffer_len = 2048;
        else
#if (PAGE_SIZE / 2) > 16384
                adapter->rx_buffer_len = 16384;
#else
                adapter->rx_buffer_len = PAGE_SIZE / 2;
#endif

        /* adjust allocation if LPE protects us, and we aren't using SBP */
        if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
            (max_frame == ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN))
                adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN +
                                         ETH_FCS_LEN;

        netdev_dbg(netdev, "changing MTU from %d to %d\n",
                   netdev->mtu, new_mtu);
        netdev->mtu = new_mtu;

        if (netif_running(netdev))
                igbvf_up(adapter);
        else
                igbvf_reset(adapter);

        clear_bit(__IGBVF_RESETTING, &adapter->state);

        return 0;
}

static int igbvf_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
{
        switch (cmd) {
        default:
                return -EOPNOTSUPP;
        }
}

static int igbvf_suspend(struct device *dev_d)
{
        struct net_device *netdev = dev_get_drvdata(dev_d);
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (netif_running(netdev)) {
                WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
                igbvf_down(adapter);
                igbvf_free_irq(adapter);
        }

        return 0;
}

static int __maybe_unused igbvf_resume(struct device *dev_d)
{
        struct pci_dev *pdev = to_pci_dev(dev_d);
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        u32 err;

        pci_set_master(pdev);

        if (netif_running(netdev)) {
                err = igbvf_request_irq(adapter);
                if (err)
                        return err;
        }

        igbvf_reset(adapter);

        if (netif_running(netdev))
                igbvf_up(adapter);

        netif_device_attach(netdev);

        return 0;
}

static void igbvf_shutdown(struct pci_dev *pdev)
{
        igbvf_suspend(&pdev->dev);
}

#ifdef CONFIG_NET_POLL_CONTROLLER
/* Polling 'interrupt' - used by things like netconsole to send skbs
 * without having to re-enable interrupts. It's not called while
 * the interrupt routine is executing.
 */
static void igbvf_netpoll(struct net_device *netdev)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        disable_irq(adapter->pdev->irq);

        igbvf_clean_tx_irq(adapter->tx_ring);

        enable_irq(adapter->pdev->irq);
}
#endif

/**
 * igbvf_io_error_detected - called when PCI error is detected
 * @pdev: Pointer to PCI device
 * @state: The current pci connection state
 *
 * This function is called after a PCI bus error affecting
 * this device has been detected.
 */
static pci_ers_result_t igbvf_io_error_detected(struct pci_dev *pdev,
                                                pci_channel_state_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure)
                return PCI_ERS_RESULT_DISCONNECT;

        if (netif_running(netdev))
                igbvf_down(adapter);
        pci_disable_device(pdev);

        /* Request a slot slot reset. */
        return PCI_ERS_RESULT_NEED_RESET;
}

/**
 * igbvf_io_slot_reset - called after the pci bus has been reset.
 * @pdev: Pointer to PCI device
 *
 * Restart the card from scratch, as if from a cold-boot. Implementation
 * resembles the first-half of the igbvf_resume routine.
 */
static pci_ers_result_t igbvf_io_slot_reset(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        if (pci_enable_device_mem(pdev)) {
                dev_err(&pdev->dev,
                        "Cannot re-enable PCI device after reset.\n");
                return PCI_ERS_RESULT_DISCONNECT;
        }
        pci_set_master(pdev);

        igbvf_reset(adapter);

        return PCI_ERS_RESULT_RECOVERED;
}

/**
 * igbvf_io_resume - called when traffic can start flowing again.
 * @pdev: Pointer to PCI device
 *
 * This callback is called when the error recovery driver tells us that
 * its OK to resume normal operation. Implementation resembles the
 * second-half of the igbvf_resume routine.
 */
static void igbvf_io_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        if (netif_running(netdev)) {
                if (igbvf_up(adapter)) {
                        dev_err(&pdev->dev,
                                "can't bring device back up after reset\n");
                        return;
                }
        }

        netif_device_attach(netdev);
}

static void igbvf_print_device_info(struct igbvf_adapter *adapter)
{
        struct e1000_hw *hw = &adapter->hw;
        struct net_device *netdev = adapter->netdev;
        struct pci_dev *pdev = adapter->pdev;

        if (hw->mac.type == e1000_vfadapt_i350)
                dev_info(&pdev->dev, "Intel(R) I350 Virtual Function\n");
        else
                dev_info(&pdev->dev, "Intel(R) 82576 Virtual Function\n");
        dev_info(&pdev->dev, "Address: %pM\n", netdev->dev_addr);
}

static int igbvf_set_features(struct net_device *netdev,
                              netdev_features_t features)
{
        struct igbvf_adapter *adapter = netdev_priv(netdev);

        if (features & NETIF_F_RXCSUM)
                adapter->flags &= ~IGBVF_FLAG_RX_CSUM_DISABLED;
        else
                adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;

        return 0;
}

#define IGBVF_MAX_MAC_HDR_LEN           127
#define IGBVF_MAX_NETWORK_HDR_LEN       511

static netdev_features_t
igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
                     netdev_features_t features)
{
        unsigned int network_hdr_len, mac_hdr_len;

        /* Make certain the headers can be described by a context descriptor */
        mac_hdr_len = skb_network_header(skb) - skb->data;
        if (unlikely(mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN))
                return features & ~(NETIF_F_HW_CSUM |
                                    NETIF_F_SCTP_CRC |
                                    NETIF_F_HW_VLAN_CTAG_TX |
                                    NETIF_F_TSO |
                                    NETIF_F_TSO6);

        network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
        if (unlikely(network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN))
                return features & ~(NETIF_F_HW_CSUM |
                                    NETIF_F_SCTP_CRC |
                                    NETIF_F_TSO |
                                    NETIF_F_TSO6);

        /* We can only support IPV4 TSO in tunnels if we can mangle the
         * inner IP ID field, so strip TSO if MANGLEID is not supported.
         */
        if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
                features &= ~NETIF_F_TSO;

        return features;
}

static const struct net_device_ops igbvf_netdev_ops = {
        .ndo_open               = igbvf_open,
        .ndo_stop               = igbvf_close,
        .ndo_start_xmit         = igbvf_xmit_frame,
        .ndo_set_rx_mode        = igbvf_set_rx_mode,
        .ndo_set_mac_address    = igbvf_set_mac,
        .ndo_change_mtu         = igbvf_change_mtu,
        .ndo_do_ioctl           = igbvf_ioctl,
        .ndo_tx_timeout         = igbvf_tx_timeout,
        .ndo_vlan_rx_add_vid    = igbvf_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = igbvf_vlan_rx_kill_vid,
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = igbvf_netpoll,
#endif
        .ndo_set_features       = igbvf_set_features,
        .ndo_features_check     = igbvf_features_check,
};

/**
 * igbvf_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in igbvf_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * igbvf_probe initializes an adapter identified by a pci_dev structure.
 * The OS initialization, configuring of the adapter private structure,
 * and a hardware reset occur.
 **/
static int igbvf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct igbvf_adapter *adapter;
        struct e1000_hw *hw;
        const struct igbvf_info *ei = igbvf_info_tbl[ent->driver_data];

        static int cards_found;
        int err, pci_using_dac;

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

        pci_using_dac = 0;
        err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
        if (!err) {
                pci_using_dac = 1;
        } else {
                err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
                if (err) {
                        dev_err(&pdev->dev,
                                "No usable DMA configuration, aborting\n");
                        goto err_dma;
                }
        }

        err = pci_request_regions(pdev, igbvf_driver_name);
        if (err)
                goto err_pci_reg;

        pci_set_master(pdev);

        err = -ENOMEM;
        netdev = alloc_etherdev(sizeof(struct igbvf_adapter));
        if (!netdev)
                goto err_alloc_etherdev;

        SET_NETDEV_DEV(netdev, &pdev->dev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);
        hw = &adapter->hw;
        adapter->netdev = netdev;
        adapter->pdev = pdev;
        adapter->ei = ei;
        adapter->pba = ei->pba;
        adapter->flags = ei->flags;
        adapter->hw.back = adapter;
        adapter->hw.mac.type = ei->mac;
        adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

        /* PCI config space info */

        hw->vendor_id = pdev->vendor;
        hw->device_id = pdev->device;
        hw->subsystem_vendor_id = pdev->subsystem_vendor;
        hw->subsystem_device_id = pdev->subsystem_device;
        hw->revision_id = pdev->revision;

        err = -EIO;
        adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0),
                                      pci_resource_len(pdev, 0));

        if (!adapter->hw.hw_addr)
                goto err_ioremap;

        if (ei->get_variants) {
                err = ei->get_variants(adapter);
                if (err)
                        goto err_get_variants;
        }

        /* setup adapter struct */
        err = igbvf_sw_init(adapter);
        if (err)
                goto err_sw_init;

        /* construct the net_device struct */
        netdev->netdev_ops = &igbvf_netdev_ops;

        igbvf_set_ethtool_ops(netdev);
        netdev->watchdog_timeo = 5 * HZ;
        strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);

        adapter->bd_number = cards_found++;

        netdev->hw_features = NETIF_F_SG |
                              NETIF_F_TSO |
                              NETIF_F_TSO6 |
                              NETIF_F_RXCSUM |
                              NETIF_F_HW_CSUM |
                              NETIF_F_SCTP_CRC;

#define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
                                    NETIF_F_GSO_GRE_CSUM | \
                                    NETIF_F_GSO_IPXIP4 | \
                                    NETIF_F_GSO_IPXIP6 | \
                                    NETIF_F_GSO_UDP_TUNNEL | \
                                    NETIF_F_GSO_UDP_TUNNEL_CSUM)

        netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
        netdev->hw_features |= NETIF_F_GSO_PARTIAL |
                               IGBVF_GSO_PARTIAL_FEATURES;

        netdev->features = netdev->hw_features;

        if (pci_using_dac)
                netdev->features |= NETIF_F_HIGHDMA;

        netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
        netdev->mpls_features |= NETIF_F_HW_CSUM;
        netdev->hw_enc_features |= netdev->vlan_features;

        /* set this bit last since it cannot be part of vlan_features */
        netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
                            NETIF_F_HW_VLAN_CTAG_RX |
                            NETIF_F_HW_VLAN_CTAG_TX;

        /* MTU range: 68 - 9216 */
        netdev->min_mtu = ETH_MIN_MTU;
        netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;

        spin_lock_bh(&hw->mbx_lock);

        /*reset the controller to put the device in a known good state */
        err = hw->mac.ops.reset_hw(hw);
        if (err) {
                dev_info(&pdev->dev,
                         "PF still in reset state. Is the PF interface up?\n");
        } else {
                err = hw->mac.ops.read_mac_addr(hw);
                if (err)
                        dev_info(&pdev->dev, "Error reading MAC address.\n");
                else if (is_zero_ether_addr(adapter->hw.mac.addr))
                        dev_info(&pdev->dev,
                                 "MAC address not assigned by administrator.\n");
                memcpy(netdev->dev_addr, adapter->hw.mac.addr,
                       netdev->addr_len);
        }

        spin_unlock_bh(&hw->mbx_lock);

        if (!is_valid_ether_addr(netdev->dev_addr)) {
                dev_info(&pdev->dev, "Assigning random MAC address.\n");
                eth_hw_addr_random(netdev);
                memcpy(adapter->hw.mac.addr, netdev->dev_addr,
                       netdev->addr_len);
        }

        timer_setup(&adapter->watchdog_timer, igbvf_watchdog, 0);

        INIT_WORK(&adapter->reset_task, igbvf_reset_task);
        INIT_WORK(&adapter->watchdog_task, igbvf_watchdog_task);

        /* ring size defaults */
        adapter->rx_ring->count = 1024;
        adapter->tx_ring->count = 1024;

        /* reset the hardware with the new settings */
        igbvf_reset(adapter);

        /* set hardware-specific flags */
        if (adapter->hw.mac.type == e1000_vfadapt_i350)
                adapter->flags |= IGBVF_FLAG_RX_LB_VLAN_BSWAP;

        strcpy(netdev->name, "eth%d");
        err = register_netdev(netdev);
        if (err)
                goto err_hw_init;

        /* tell the stack to leave us alone until igbvf_open() is called */
        netif_carrier_off(netdev);
        netif_stop_queue(netdev);

        igbvf_print_device_info(adapter);

        igbvf_initialize_last_counter_stats(adapter);

        return 0;

err_hw_init:
        kfree(adapter->tx_ring);
        kfree(adapter->rx_ring);
err_sw_init:
        igbvf_reset_interrupt_capability(adapter);
err_get_variants:
        iounmap(adapter->hw.hw_addr);
err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_regions(pdev);
err_pci_reg:
err_dma:
        pci_disable_device(pdev);
        return err;
}

/**
 * igbvf_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * igbvf_remove is called by the PCI subsystem to alert the driver
 * that it should release a PCI device.  The could be caused by a
 * Hot-Plug event, or because the driver is going to be removed from
 * memory.
 **/
static void igbvf_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct igbvf_adapter *adapter = netdev_priv(netdev);
        struct e1000_hw *hw = &adapter->hw;

        /* The watchdog timer may be rescheduled, so explicitly
         * disable it from being rescheduled.
         */
        set_bit(__IGBVF_DOWN, &adapter->state);
        del_timer_sync(&adapter->watchdog_timer);

        cancel_work_sync(&adapter->reset_task);
        cancel_work_sync(&adapter->watchdog_task);

        unregister_netdev(netdev);

        igbvf_reset_interrupt_capability(adapter);

        /* it is important to delete the NAPI struct prior to freeing the
         * Rx ring so that you do not end up with null pointer refs
         */
        netif_napi_del(&adapter->rx_ring->napi);
        kfree(adapter->tx_ring);
        kfree(adapter->rx_ring);

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

        free_netdev(netdev);

        pci_disable_device(pdev);
}

/* PCI Error Recovery (ERS) */
static const struct pci_error_handlers igbvf_err_handler = {
        .error_detected = igbvf_io_error_detected,
        .slot_reset = igbvf_io_slot_reset,
        .resume = igbvf_io_resume,
};

static const struct pci_device_id igbvf_pci_tbl[] = {
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_VF), board_vf },
        { PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_VF), board_i350_vf },
        { } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, igbvf_pci_tbl);

static SIMPLE_DEV_PM_OPS(igbvf_pm_ops, igbvf_suspend, igbvf_resume);

/* PCI Device API Driver */
static struct pci_driver igbvf_driver = {
        .name           = igbvf_driver_name,
        .id_table       = igbvf_pci_tbl,
        .probe          = igbvf_probe,
        .remove         = igbvf_remove,
        .driver.pm      = &igbvf_pm_ops,
        .shutdown       = igbvf_shutdown,
        .err_handler    = &igbvf_err_handler
};

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

        pr_info("%s\n", igbvf_driver_string);
        pr_info("%s\n", igbvf_copyright);

        ret = pci_register_driver(&igbvf_driver);

        return ret;
}
module_init(igbvf_init_module);

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

MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
MODULE_DESCRIPTION("Intel(R) Gigabit Virtual Function Network Driver");
MODULE_LICENSE("GPL v2");

/* netdev.c */