[deliverable/linux.git] / drivers / net / ethernet / intel / ixgbevf / ixgbevf_main.c

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

  Intel 82599 Virtual Function driver
  Copyright(c) 1999 - 2014 Intel Corporation.

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

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

  You should have received a copy of the GNU General Public License along with
  this program; if not, write to the Free Software Foundation, Inc.,
  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.

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

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

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


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

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

#include "ixgbevf.h"

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

#define DRV_VERSION "2.12.1-k"
const char ixgbevf_driver_version[] = DRV_VERSION;
static char ixgbevf_copyright[] =
        "Copyright (c) 2009 - 2012 Intel Corporation.";

static const struct ixgbevf_info *ixgbevf_info_tbl[] = {
        [board_82599_vf] = &ixgbevf_82599_vf_info,
        [board_X540_vf]  = &ixgbevf_X540_vf_info,
};

/* ixgbevf_pci_tbl - PCI Device ID Table
 *
 * Wildcard entries (PCI_ANY_ID) should come last
 * Last entry must be all 0s
 *
 * { Vendor ID, Device ID, SubVendor ID, SubDevice ID,
 *   Class, Class Mask, private data (not used) }
 */
static const struct pci_device_id ixgbevf_pci_tbl[] = {
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_82599_VF), board_82599_vf },
        {PCI_VDEVICE(INTEL, IXGBE_DEV_ID_X540_VF), board_X540_vf },
        /* required last entry */
        {0, }
};
MODULE_DEVICE_TABLE(pci, ixgbevf_pci_tbl);

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

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

/* forward decls */
static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter);
static void ixgbevf_set_itr(struct ixgbevf_q_vector *q_vector);
static void ixgbevf_free_all_rx_resources(struct ixgbevf_adapter *adapter);

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

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

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

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

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

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

/**
 * ixgbevf_set_ivar - set IVAR registers - maps interrupt causes to vectors
 * @adapter: pointer to adapter struct
 * @direction: 0 for Rx, 1 for Tx, -1 for other causes
 * @queue: queue to map the corresponding interrupt to
 * @msix_vector: the vector to map to the corresponding queue
 */
static void ixgbevf_set_ivar(struct ixgbevf_adapter *adapter, s8 direction,
                             u8 queue, u8 msix_vector)
{
        u32 ivar, index;
        struct ixgbe_hw *hw = &adapter->hw;
        if (direction == -1) {
                /* other causes */
                msix_vector |= IXGBE_IVAR_ALLOC_VAL;
                ivar = IXGBE_READ_REG(hw, IXGBE_VTIVAR_MISC);
                ivar &= ~0xFF;
                ivar |= msix_vector;
                IXGBE_WRITE_REG(hw, IXGBE_VTIVAR_MISC, ivar);
        } else {
                /* tx or rx causes */
                msix_vector |= IXGBE_IVAR_ALLOC_VAL;
                index = ((16 * (queue & 1)) + (8 * direction));
                ivar = IXGBE_READ_REG(hw, IXGBE_VTIVAR(queue >> 1));
                ivar &= ~(0xFF << index);
                ivar |= (msix_vector << index);
                IXGBE_WRITE_REG(hw, IXGBE_VTIVAR(queue >> 1), ivar);
        }
}

static void ixgbevf_unmap_and_free_tx_resource(struct ixgbevf_ring *tx_ring,
                                        struct ixgbevf_tx_buffer *tx_buffer)
{
        if (tx_buffer->skb) {
                dev_kfree_skb_any(tx_buffer->skb);
                if (dma_unmap_len(tx_buffer, len))
                        dma_unmap_single(tx_ring->dev,
                                         dma_unmap_addr(tx_buffer, dma),
                                         dma_unmap_len(tx_buffer, len),
                                         DMA_TO_DEVICE);
        } else if (dma_unmap_len(tx_buffer, len)) {
                dma_unmap_page(tx_ring->dev,
                               dma_unmap_addr(tx_buffer, dma),
                               dma_unmap_len(tx_buffer, len),
                               DMA_TO_DEVICE);
        }
        tx_buffer->next_to_watch = NULL;
        tx_buffer->skb = NULL;
        dma_unmap_len_set(tx_buffer, len, 0);
        /* tx_buffer must be completely set up in the transmit path */
}

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

/* Tx Descriptors needed, worst case */
#define TXD_USE_COUNT(S) DIV_ROUND_UP((S), IXGBE_MAX_DATA_PER_TXD)
#define DESC_NEEDED (MAX_SKB_FRAGS + 4)

static void ixgbevf_tx_timeout(struct net_device *netdev);

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

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

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

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

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

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

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

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

                /* update the statistics for this packet */
                total_bytes += tx_buffer->bytecount;
                total_packets += tx_buffer->gso_segs;

                /* free the skb */
                dev_kfree_skb_any(tx_buffer->skb);

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

                /* clear tx_buffer data */
                tx_buffer->skb = NULL;
                dma_unmap_len_set(tx_buffer, len, 0);

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

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

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

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

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

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

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

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

        return !!budget;
}

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

        if (ixgbevf_qv_busy_polling(q_vector)) {
                netif_receive_skb(skb);
                /* exit early if we busy polled */
                return;
        }
#endif /* CONFIG_NET_RX_BUSY_POLL */

        napi_gro_receive(&q_vector->napi, skb);
}

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

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

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

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

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

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

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

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

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

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

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

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

        prefetch(IXGBEVF_RX_DESC(rx_ring, ntc));

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

        return true;
}

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

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

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

        /* map page for use */
        dma = dma_map_page(rx_ring->dev, page, 0,
                           PAGE_SIZE, DMA_FROM_DEVICE);

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

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

        bi->dma = dma;
        bi->page = page;
        bi->page_offset = 0;

        return true;
}

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

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

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

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

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

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

                /* clear the hdr_addr for the next_to_use descriptor */
                rx_desc->read.hdr_addr = 0;

                cleaned_count--;
        } while (cleaned_count);

        i += rx_ring->count;

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

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

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

/* ixgbevf_pull_tail - ixgbevf specific version of skb_pull_tail
 * @rx_ring: rx descriptor ring packet is being transacted on
 * @skb: pointer to current skb being adjusted
 *
 * This function is an ixgbevf specific version of __pskb_pull_tail.  The
 * main difference between this version and the original function is that
 * this function can make several assumptions about the state of things
 * that allow for significant optimizations versus the standard function.
 * As a result we can do things like drop a frag and maintain an accurate
 * truesize for the skb.
 */
static void ixgbevf_pull_tail(struct ixgbevf_ring *rx_ring,
                              struct sk_buff *skb)
{
        struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
        unsigned char *va;
        unsigned int pull_len;

        /* it is valid to use page_address instead of kmap since we are
         * working with pages allocated out of the lomem pool per
         * alloc_page(GFP_ATOMIC)
         */
        va = skb_frag_address(frag);

        /* we need the header to contain the greater of either ETH_HLEN or
         * 60 bytes if the skb->len is less than 60 for skb_pad.
         */
        pull_len = eth_get_headlen(va, IXGBEVF_RX_HDR_SIZE);

        /* align pull length to size of long to optimize memcpy performance */
        skb_copy_to_linear_data(skb, va, ALIGN(pull_len, sizeof(long)));

        /* update all of the pointers */
        skb_frag_size_sub(frag, pull_len);
        frag->page_offset += pull_len;
        skb->data_len -= pull_len;
        skb->tail += pull_len;
}

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

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

        /* place header in linear portion of buffer */
        if (skb_is_nonlinear(skb))
                ixgbevf_pull_tail(rx_ring, skb);

        /* if skb_pad returns an error the skb was freed */
        if (unlikely(skb->len < 60)) {
                int pad_len = 60 - skb->len;

                if (skb_pad(skb, pad_len))
                        return true;
                __skb_put(skb, pad_len);
        }

        return false;
}

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

        new_buff = &rx_ring->rx_buffer_info[nta];

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

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

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

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

/* ixgbevf_add_rx_frag - Add contents of Rx buffer to sk_buff
 * @rx_ring: rx descriptor ring to transact packets on
 * @rx_buffer: buffer containing page to add
 * @rx_desc: descriptor containing length of buffer written by hardware
 * @skb: sk_buff to place the data into
 *
 * This function will add the data contained in rx_buffer->page to the skb.
 * This is done either through a direct copy if the data in the buffer is
 * less than the skb header size, otherwise it will just attach the page as
 * a frag to the skb.
 *
 * The function will then update the page offset if necessary and return
 * true if the buffer can be reused by the adapter.
 */
static bool ixgbevf_add_rx_frag(struct ixgbevf_ring *rx_ring,
                                struct ixgbevf_rx_buffer *rx_buffer,
                                union ixgbe_adv_rx_desc *rx_desc,
                                struct sk_buff *skb)
{
        struct page *page = rx_buffer->page;
        unsigned int size = le16_to_cpu(rx_desc->wb.upper.length);
#if (PAGE_SIZE < 8192)
        unsigned int truesize = IXGBEVF_RX_BUFSZ;
#else
        unsigned int truesize = ALIGN(size, L1_CACHE_BYTES);
#endif

        if ((size <= IXGBEVF_RX_HDR_SIZE) && !skb_is_nonlinear(skb)) {
                unsigned char *va = page_address(page) + rx_buffer->page_offset;

                memcpy(__skb_put(skb, size), va, ALIGN(size, sizeof(long)));

                /* page is not reserved, we can reuse buffer as is */
                if (likely(!ixgbevf_page_is_reserved(page)))
                        return true;

                /* this page cannot be reused so discard it */
                put_page(page);
                return false;
        }

        skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
                        rx_buffer->page_offset, size, truesize);

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

#if (PAGE_SIZE < 8192)
        /* if we are only owner of page we can reuse it */
        if (unlikely(page_count(page) != 1))
                return false;

        /* flip page offset to other buffer */
        rx_buffer->page_offset ^= IXGBEVF_RX_BUFSZ;

#else
        /* move offset up to the next cache line */
        rx_buffer->page_offset += truesize;

        if (rx_buffer->page_offset > (PAGE_SIZE - IXGBEVF_RX_BUFSZ))
                return false;

#endif
        /* Even if we own the page, we are not allowed to use atomic_set()
         * This would break get_page_unless_zero() users.
         */
        atomic_inc(&page->_count);

        return true;
}

static struct sk_buff *ixgbevf_fetch_rx_buffer(struct ixgbevf_ring *rx_ring,
                                               union ixgbe_adv_rx_desc *rx_desc,
                                               struct sk_buff *skb)
{
        struct ixgbevf_rx_buffer *rx_buffer;
        struct page *page;

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

        if (likely(!skb)) {
                void *page_addr = page_address(page) +
                                  rx_buffer->page_offset;

                /* prefetch first cache line of first page */
                prefetch(page_addr);
#if L1_CACHE_BYTES < 128
                prefetch(page_addr + L1_CACHE_BYTES);
#endif

                /* allocate a skb to store the frags */
                skb = netdev_alloc_skb_ip_align(rx_ring->netdev,
                                                IXGBEVF_RX_HDR_SIZE);
                if (unlikely(!skb)) {
                        rx_ring->rx_stats.alloc_rx_buff_failed++;
                        return NULL;
                }

                /* we will be copying header into skb->data in
                 * pskb_may_pull so it is in our interest to prefetch
                 * it now to avoid a possible cache miss
                 */
                prefetchw(skb->data);
        }

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

        /* pull page into skb */
        if (ixgbevf_add_rx_frag(rx_ring, rx_buffer, rx_desc, skb)) {
                /* hand second half of page back to the ring */
                ixgbevf_reuse_rx_page(rx_ring, rx_buffer);
        } else {
                /* we are not reusing the buffer so unmap it */
                dma_unmap_page(rx_ring->dev, rx_buffer->dma,
                               PAGE_SIZE, DMA_FROM_DEVICE);
        }

        /* clear contents of buffer_info */
        rx_buffer->dma = 0;
        rx_buffer->page = NULL;

        return skb;
}

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

        IXGBE_WRITE_REG(hw, IXGBE_VTEIMS, qmask);
}

static int ixgbevf_clean_rx_irq(struct ixgbevf_q_vector *q_vector,
                                struct ixgbevf_ring *rx_ring,
                                int budget)
{
        unsigned int total_rx_bytes = 0, total_rx_packets = 0;
        u16 cleaned_count = ixgbevf_desc_unused(rx_ring);
        struct sk_buff *skb = rx_ring->skb;

        while (likely(total_rx_packets < budget)) {
                union ixgbe_adv_rx_desc *rx_desc;

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

                rx_desc = IXGBEVF_RX_DESC(rx_ring, rx_ring->next_to_clean);

                if (!ixgbevf_test_staterr(rx_desc, IXGBE_RXD_STAT_DD))
                        break;

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

                /* retrieve a buffer from the ring */
                skb = ixgbevf_fetch_rx_buffer(rx_ring, rx_desc, skb);

                /* exit if we failed to retrieve a buffer */
                if (!skb)
                        break;

                cleaned_count++;

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

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

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

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

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

                ixgbevf_rx_skb(q_vector, skb);

                /* reset skb pointer */
                skb = NULL;

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

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

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

        return total_rx_packets;
}

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

        ixgbevf_for_each_ring(ring, q_vector->tx)
                clean_complete &= ixgbevf_clean_tx_irq(q_vector, ring);

#ifdef CONFIG_NET_RX_BUSY_POLL
        if (!ixgbevf_qv_lock_napi(q_vector))
                return budget;
#endif

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

        ixgbevf_for_each_ring(ring, q_vector->rx)
                clean_complete &= (ixgbevf_clean_rx_irq(q_vector, ring,
                                                        per_ring_budget)
                                   < per_ring_budget);

#ifdef CONFIG_NET_RX_BUSY_POLL
        ixgbevf_qv_unlock_napi(q_vector);
#endif

        /* If all work not completed, return budget and keep polling */
        if (!clean_complete)
                return budget;
        /* all work done, exit the polling mode */
        napi_complete(napi);
        if (adapter->rx_itr_setting & 1)
                ixgbevf_set_itr(q_vector);
        if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
            !test_bit(__IXGBEVF_REMOVING, &adapter->state))
                ixgbevf_irq_enable_queues(adapter,
                                          1 << q_vector->v_idx);

        return 0;
}

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

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

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

#ifdef CONFIG_NET_RX_BUSY_POLL
/* must be called with local_bh_disable()d */
static int ixgbevf_busy_poll_recv(struct napi_struct *napi)
{
        struct ixgbevf_q_vector *q_vector =
                        container_of(napi, struct ixgbevf_q_vector, napi);
        struct ixgbevf_adapter *adapter = q_vector->adapter;
        struct ixgbevf_ring  *ring;
        int found = 0;

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

        if (!ixgbevf_qv_lock_poll(q_vector))
                return LL_FLUSH_BUSY;

        ixgbevf_for_each_ring(ring, q_vector->rx) {
                found = ixgbevf_clean_rx_irq(q_vector, ring, 4);
#ifdef BP_EXTENDED_STATS
                if (found)
                        ring->stats.cleaned += found;
                else
                        ring->stats.misses++;
#endif
                if (found)
                        break;
        }

        ixgbevf_qv_unlock_poll(q_vector);

        return found;
}
#endif /* CONFIG_NET_RX_BUSY_POLL */

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

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

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

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

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

                if (q_vector->tx.ring && !q_vector->rx.ring) {
                        /* tx only vector */
                        if (adapter->tx_itr_setting == 1)
                                q_vector->itr = IXGBE_10K_ITR;
                        else
                                q_vector->itr = adapter->tx_itr_setting;
                } else {
                        /* rx or rx/tx vector */
                        if (adapter->rx_itr_setting == 1)
                                q_vector->itr = IXGBE_20K_ITR;
                        else
                                q_vector->itr = adapter->rx_itr_setting;
                }

                /* add q_vector eims value to global eims_enable_mask */
                adapter->eims_enable_mask |= 1 << v_idx;

                ixgbevf_write_eitr(q_vector);
        }

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

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

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

        if (packets == 0)
                return;

        /* simple throttlerate management
         *    0-20MB/s lowest (100000 ints/s)
         *   20-100MB/s low   (20000 ints/s)
         *  100-1249MB/s bulk (8000 ints/s)
         */
        /* what was last interrupt timeslice? */
        timepassed_us = q_vector->itr >> 2;
        bytes_perint = bytes / timepassed_us; /* bytes/usec */

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

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

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

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

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

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

        switch (current_itr) {
        /* counts and packets in update_itr are dependent on these numbers */
        case lowest_latency:
                new_itr = IXGBE_100K_ITR;
                break;
        case low_latency:
                new_itr = IXGBE_20K_ITR;
                break;
        case bulk_latency:
        default:
                new_itr = IXGBE_8K_ITR;
                break;
        }

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

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

                ixgbevf_write_eitr(q_vector);
        }
}

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

        hw->mac.get_link_status = 1;

        if (!test_bit(__IXGBEVF_DOWN, &adapter->state) &&
            !test_bit(__IXGBEVF_REMOVING, &adapter->state))
                mod_timer(&adapter->watchdog_timer, jiffies);

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

        return IRQ_HANDLED;
}

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

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

        return IRQ_HANDLED;
}

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

        a->rx_ring[r_idx]->next = q_vector->rx.ring;
        q_vector->rx.ring = a->rx_ring[r_idx];
        q_vector->rx.count++;
}

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

        a->tx_ring[t_idx]->next = q_vector->tx.ring;
        q_vector->tx.ring = a->tx_ring[t_idx];
        q_vector->tx.count++;
}

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

        q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

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

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

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

out:
        return err;
}

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

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

                if (q_vector->tx.ring && q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "%s-%s-%d", netdev->name, "TxRx", ri++);
                        ti++;
                } else if (q_vector->rx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "%s-%s-%d", netdev->name, "rx", ri++);
                } else if (q_vector->tx.ring) {
                        snprintf(q_vector->name, sizeof(q_vector->name) - 1,
                                 "%s-%s-%d", netdev->name, "tx", ti++);
                } else {
                        /* skip this unused q_vector */
                        continue;
                }
                err = request_irq(entry->vector, &ixgbevf_msix_clean_rings, 0,
                                  q_vector->name, q_vector);
                if (err) {
                        hw_dbg(&adapter->hw,
                               "request_irq failed for MSIX interrupt "
                               "Error: %d\n", err);
                        goto free_queue_irqs;
                }
        }

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

        return 0;

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

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

        for (i = 0; i < q_vectors; i++) {
                struct ixgbevf_q_vector *q_vector = adapter->q_vector[i];
                q_vector->rx.ring = NULL;
                q_vector->tx.ring = NULL;
                q_vector->rx.count = 0;
                q_vector->tx.count = 0;
        }
}

/**
 * ixgbevf_request_irq - initialize interrupts
 * @adapter: board private structure
 *
 * Attempts to configure interrupts using the best available
 * capabilities of the hardware and kernel.
 **/
static int ixgbevf_request_irq(struct ixgbevf_adapter *adapter)
{
        int err = 0;

        err = ixgbevf_request_msix_irqs(adapter);

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

        return err;
}

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

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

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

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

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

        ixgbevf_reset_q_vectors(adapter);
}

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

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

        IXGBE_WRITE_FLUSH(hw);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

#define IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT 2

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

        srrctl = IXGBE_SRRCTL_DROP_EN;

        srrctl |= IXGBEVF_RX_HDR_SIZE << IXGBE_SRRCTL_BSIZEHDRSIZE_SHIFT;
        srrctl |= IXGBEVF_RX_BUFSZ >> IXGBE_SRRCTL_BSIZEPKT_SHIFT;
        srrctl |= IXGBE_SRRCTL_DESCTYPE_ADV_ONEBUF;

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

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

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

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

        IXGBE_WRITE_REG(hw, IXGBE_VFPSRTYPE, psrtype);
}

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

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

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

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

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

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

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

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

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

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

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

        /* enable relaxed ordering */
        IXGBE_WRITE_REG(hw, IXGBE_VFDCA_RXCTRL(reg_idx),
                        IXGBE_DCA_RXCTRL_DESC_RRO_EN);

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

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

        ixgbevf_configure_srrctl(adapter, reg_idx);

        /* allow any size packet since we can handle overflow */
        rxdctl &= ~IXGBE_RXDCTL_RLPML_EN;

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

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

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

        ixgbevf_setup_psrtype(adapter);

        /* notify the PF of our intent to use this size of frame */
        ixgbevf_rlpml_set_vf(hw, netdev->mtu + ETH_HLEN + ETH_FCS_LEN);

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

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

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

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

        if (err == IXGBE_ERR_INVALID_ARGUMENT)
                return -EACCES;

        set_bit(vid, adapter->active_vlans);

        return err;
}

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

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

        clear_bit(vid, adapter->active_vlans);

        return err;
}

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

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

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

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

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

        return count;
}

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

        spin_lock_bh(&adapter->mbx_lock);

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

        ixgbevf_write_uc_addr_list(netdev);

        spin_unlock_bh(&adapter->mbx_lock);
}

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

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

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

        for (q_idx = 0; q_idx < q_vectors; q_idx++) {
                q_vector = adapter->q_vector[q_idx];
                napi_disable(&q_vector->napi);
#ifdef CONFIG_NET_RX_BUSY_POLL
                while (!ixgbevf_qv_disable(adapter->q_vector[q_idx])) {
                        pr_info("QV %d locked\n", q_idx);
                        usleep_range(1000, 20000);
                }
#endif /* CONFIG_NET_RX_BUSY_POLL */
        }
}

static int ixgbevf_configure_dcb(struct ixgbevf_adapter *adapter)
{
        struct ixgbe_hw *hw = &adapter->hw;
        unsigned int def_q = 0;
        unsigned int num_tcs = 0;
        unsigned int num_rx_queues = 1;
        int err;

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

        if (err)
                return err;

        if (num_tcs > 1) {
                /* update default Tx ring register index */
                adapter->tx_ring[0]->reg_idx = def_q;

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

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

                /* wait for watchdog to come around and bail us out */
                adapter->flags |= IXGBEVF_FLAG_QUEUE_RESET_REQUESTED;
        }

        return 0;
}

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

        ixgbevf_set_rx_mode(adapter->netdev);

        ixgbevf_restore_vlan(adapter);

        ixgbevf_configure_tx(adapter);
        ixgbevf_configure_rx(adapter);
}

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

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

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

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

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

        spin_lock_bh(&adapter->mbx_lock);

        while (api[idx] != ixgbe_mbox_api_unknown) {
                err = ixgbevf_negotiate_api_version(hw, api[idx]);
                if (!err)
                        break;
                idx++;
        }

        spin_unlock_bh(&adapter->mbx_lock);
}

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

        ixgbevf_configure_msix(adapter);

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

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

        /* enable transmits */
        netif_tx_start_all_queues(netdev);

        ixgbevf_save_reset_stats(adapter);
        ixgbevf_init_last_counter_stats(adapter);

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

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

        ixgbevf_configure(adapter);

        ixgbevf_up_complete(adapter);

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

        ixgbevf_irq_enable(adapter);
}

/**
 * ixgbevf_clean_rx_ring - Free Rx Buffers per Queue
 * @rx_ring: ring to free buffers from
 **/
static void ixgbevf_clean_rx_ring(struct ixgbevf_ring *rx_ring)
{
        struct device *dev = rx_ring->dev;
        unsigned long size;
        unsigned int i;

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

        /* ring already cleared, nothing to do */
        if (!rx_ring->rx_buffer_info)
                return;

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

                rx_buffer = &rx_ring->rx_buffer_info[i];
                if (rx_buffer->dma)
                        dma_unmap_page(dev, rx_buffer->dma,
                                       PAGE_SIZE, DMA_FROM_DEVICE);
                rx_buffer->dma = 0;
                if (rx_buffer->page)
                        __free_page(rx_buffer->page);
                rx_buffer->page = NULL;
        }

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

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

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

        if (!tx_ring->tx_buffer_info)
                return;

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

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

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

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

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

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

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

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

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

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

        netif_tx_disable(netdev);

        msleep(10);

        netif_tx_stop_all_queues(netdev);

        ixgbevf_irq_disable(adapter);

        ixgbevf_napi_disable_all(adapter);

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

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

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

        netif_carrier_off(netdev);

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

        ixgbevf_clean_all_tx_rings(adapter);
        ixgbevf_clean_all_rx_rings(adapter);
}

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

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

        ixgbevf_down(adapter);
        ixgbevf_up(adapter);

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

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

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

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

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

        /* We'll want at least 2 (vector_threshold):
         * 1) TxQ[0] + RxQ[0] handler
         * 2) Other (Link Status Change, etc.)
         */
        vector_threshold = MIN_MSIX_COUNT;

        /* The more we get, the more we will assign to Tx/Rx Cleanup
         * for the separate queues...where Rx Cleanup >= Tx Cleanup.
         * Right now, we simply care about how many we'll get; we'll
         * set them up later while requesting irq's.
         */
        vectors = pci_enable_msix_range(adapter->pdev, adapter->msix_entries,
                                        vector_threshold, vectors);

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

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

        return 0;
}

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

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

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

        if (err)
                return;

        /* we need as many queues as traffic classes */
        if (num_tcs > 1)
                adapter->num_rx_queues = num_tcs;
}

/**
 * ixgbevf_alloc_queues - Allocate memory for all rings
 * @adapter: board private structure to initialize
 *
 * We allocate one ring per queue at run-time since we don't know the
 * number of queues at compile-time.  The polling_netdev array is
 * intended for Multiqueue, but should work fine with a single queue.
 **/
static int ixgbevf_alloc_queues(struct ixgbevf_adapter *adapter)
{
        struct ixgbevf_ring *ring;
        int rx = 0, tx = 0;

        for (; tx < adapter->num_tx_queues; tx++) {
                ring = kzalloc(sizeof(*ring), GFP_KERNEL);
                if (!ring)
                        goto err_allocation;

                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;
                ring->count = adapter->tx_ring_count;
                ring->queue_index = tx;
                ring->reg_idx = tx;

                adapter->tx_ring[tx] = ring;
        }

        for (; rx < adapter->num_rx_queues; rx++) {
                ring = kzalloc(sizeof(*ring), GFP_KERNEL);
                if (!ring)
                        goto err_allocation;

                ring->dev = &adapter->pdev->dev;
                ring->netdev = adapter->netdev;

                ring->count = adapter->rx_ring_count;
                ring->queue_index = rx;
                ring->reg_idx = rx;

                adapter->rx_ring[rx] = ring;
        }

        return 0;

err_allocation:
        while (tx) {
                kfree(adapter->tx_ring[--tx]);
                adapter->tx_ring[tx] = NULL;
        }

        while (rx) {
                kfree(adapter->rx_ring[--rx]);
                adapter->rx_ring[rx] = NULL;
        }
        return -ENOMEM;
}

/**
 * ixgbevf_set_interrupt_capability - set MSI-X or FAIL if not supported
 * @adapter: board private structure to initialize
 *
 * Attempt to configure the interrupts using the best available
 * capabilities of the hardware and the kernel.
 **/
static int ixgbevf_set_interrupt_capability(struct ixgbevf_adapter *adapter)
{
        struct net_device *netdev = adapter->netdev;
        int err = 0;
        int vector, v_budget;

        /*
         * It's easy to be greedy for MSI-X vectors, but it really
         * doesn't do us much good if we have a lot more vectors
         * than CPU's.  So let's be conservative and only ask for
         * (roughly) the same number of vectors as there are CPU's.
         * The default is to use pairs of vectors.
         */
        v_budget = max(adapter->num_rx_queues, adapter->num_tx_queues);
        v_budget = min_t(int, v_budget, num_online_cpus());
        v_budget += NON_Q_VECTORS;

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

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

        err = ixgbevf_acquire_msix_vectors(adapter, v_budget);
        if (err)
                goto out;

        err = netif_set_real_num_tx_queues(netdev, adapter->num_tx_queues);
        if (err)
                goto out;

        err = netif_set_real_num_rx_queues(netdev, adapter->num_rx_queues);

out:
        return err;
}

/**
 * ixgbevf_alloc_q_vectors - Allocate memory for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * We allocate one q_vector per queue interrupt.  If allocation fails we
 * return -ENOMEM.
 **/
static int ixgbevf_alloc_q_vectors(struct ixgbevf_adapter *adapter)
{
        int q_idx, num_q_vectors;
        struct ixgbevf_q_vector *q_vector;

        num_q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

        for (q_idx = 0; q_idx < num_q_vectors; q_idx++) {
                q_vector = kzalloc(sizeof(struct ixgbevf_q_vector), GFP_KERNEL);
                if (!q_vector)
                        goto err_out;
                q_vector->adapter = adapter;
                q_vector->v_idx = q_idx;
                netif_napi_add(adapter->netdev, &q_vector->napi,
                               ixgbevf_poll, 64);
#ifdef CONFIG_NET_RX_BUSY_POLL
                napi_hash_add(&q_vector->napi);
#endif
                adapter->q_vector[q_idx] = q_vector;
        }

        return 0;

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

/**
 * ixgbevf_free_q_vectors - Free memory allocated for interrupt vectors
 * @adapter: board private structure to initialize
 *
 * This function frees the memory allocated to the q_vectors.  In addition if
 * NAPI is enabled it will delete any references to the NAPI struct prior
 * to freeing the q_vector.
 **/
static void ixgbevf_free_q_vectors(struct ixgbevf_adapter *adapter)
{
        int q_idx, num_q_vectors = adapter->num_msix_vectors - NON_Q_VECTORS;

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

                adapter->q_vector[q_idx] = NULL;
#ifdef CONFIG_NET_RX_BUSY_POLL
                napi_hash_del(&q_vector->napi);
#endif
                netif_napi_del(&q_vector->napi);
                kfree(q_vector);
        }
}

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

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

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

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

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

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

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

        set_bit(__IXGBEVF_DOWN, &adapter->state);

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

/**
 * ixgbevf_clear_interrupt_scheme - Clear the current interrupt scheme settings
 * @adapter: board private structure to clear interrupt scheme on
 *
 * We go through and clear interrupt specific resources and reset the structure
 * to pre-load conditions
 **/
static void ixgbevf_clear_interrupt_scheme(struct ixgbevf_adapter *adapter)
{
        int i;

        for (i = 0; i < adapter->num_tx_queues; i++) {
                kfree(adapter->tx_ring[i]);
                adapter->tx_ring[i] = NULL;
        }
        for (i = 0; i < adapter->num_rx_queues; i++) {
                kfree(adapter->rx_ring[i]);
                adapter->rx_ring[i] = NULL;
        }

        adapter->num_tx_queues = 0;
        adapter->num_rx_queues = 0;

        ixgbevf_free_q_vectors(adapter);
        ixgbevf_reset_interrupt_capability(adapter);
}

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

        /* PCI config space info */

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

        hw->mbx.ops.init_params(hw);

        /* assume legacy case in which PF would only give VF 2 queues */
        hw->mac.max_tx_queues = 2;
        hw->mac.max_rx_queues = 2;

        /* lock to protect mailbox accesses */
        spin_lock_init(&adapter->mbx_lock);

        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.init_hw(hw);
                if (err) {
                        pr_err("init_shared_code failed: %d\n", err);
                        goto out;
                }
                ixgbevf_negotiate_api(adapter);
                err = hw->mac.ops.get_mac_addr(hw, hw->mac.addr);
                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, hw->mac.addr, netdev->addr_len);
        }

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

        /* Enable dynamic interrupt throttling rates */
        adapter->rx_itr_setting = 1;
        adapter->tx_itr_setting = 1;

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

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

out:
        return err;
}

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

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

        if (!adapter->link_up)
                return;

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

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

/**
 * ixgbevf_watchdog - Timer Call-back
 * @data: pointer to adapter cast into an unsigned long
 **/
static void ixgbevf_watchdog(unsigned long data)
{
        struct ixgbevf_adapter *adapter = (struct ixgbevf_adapter *)data;
        struct ixgbe_hw *hw = &adapter->hw;
        u32 eics = 0;
        int i;

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

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

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

        IXGBE_WRITE_REG(hw, IXGBE_VTEICS, eics);

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

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

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

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

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

        adapter->tx_timeout_count++;

        ixgbevf_reinit_locked(adapter);
}

/**
 * ixgbevf_watchdog_task - worker thread to bring link up
 * @work: pointer to work_struct containing our data
 **/
static void ixgbevf_watchdog_task(struct work_struct *work)
{
        struct ixgbevf_adapter *adapter = container_of(work,
                                                       struct ixgbevf_adapter,
                                                       watchdog_task);
        struct net_device *netdev = adapter->netdev;
        struct ixgbe_hw *hw = &adapter->hw;
        u32 link_speed = adapter->link_speed;
        bool link_up = adapter->link_up;
        s32 need_reset;

        if (IXGBE_REMOVED(hw->hw_addr)) {
                if (!test_bit(__IXGBEVF_DOWN, &adapter->state)) {
                        rtnl_lock();
                        ixgbevf_down(adapter);
                        rtnl_unlock();
                }
                return;
        }
        ixgbevf_queue_reset_subtask(adapter);

        adapter->flags |= IXGBE_FLAG_IN_WATCHDOG_TASK;

        /*
         * Always check the link on the watchdog because we have
         * no LSC interrupt
         */
        spin_lock_bh(&adapter->mbx_lock);

        need_reset = hw->mac.ops.check_link(hw, &link_speed, &link_up, false);

        spin_unlock_bh(&adapter->mbx_lock);

        if (need_reset) {
                adapter->link_up = link_up;
                adapter->link_speed = link_speed;
                netif_carrier_off(netdev);
                netif_tx_stop_all_queues(netdev);
                schedule_work(&adapter->reset_task);
                goto pf_has_reset;
        }
        adapter->link_up = link_up;
        adapter->link_speed = link_speed;

        if (link_up) {
                if (!netif_carrier_ok(netdev)) {
                        char *link_speed_string;
                        switch (link_speed) {
                        case IXGBE_LINK_SPEED_10GB_FULL:
                                link_speed_string = "10 Gbps";
                                break;
                        case IXGBE_LINK_SPEED_1GB_FULL:
                                link_speed_string = "1 Gbps";
                                break;
                        case IXGBE_LINK_SPEED_100_FULL:
                                link_speed_string = "100 Mbps";
                                break;
                        default:
                                link_speed_string = "unknown speed";
                                break;
                        }
                        dev_info(&adapter->pdev->dev,
                                "NIC Link is Up, %s\n", link_speed_string);
                        netif_carrier_on(netdev);
                        netif_tx_wake_all_queues(netdev);
                }
        } else {
                adapter->link_up = false;
                adapter->link_speed = 0;
                if (netif_carrier_ok(netdev)) {
                        dev_info(&adapter->pdev->dev, "NIC Link is Down\n");
                        netif_carrier_off(netdev);
                        netif_tx_stop_all_queues(netdev);
                }
        }

        ixgbevf_update_stats(adapter);

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

        adapter->flags &= ~IXGBE_FLAG_IN_WATCHDOG_TASK;
}

/**
 * ixgbevf_free_tx_resources - Free Tx Resources per Queue
 * @tx_ring: Tx descriptor ring for a specific queue
 *
 * Free all transmit software resources
 **/
void ixgbevf_free_tx_resources(struct ixgbevf_ring *tx_ring)
{
        ixgbevf_clean_tx_ring(tx_ring);

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

        /* if not set, then don't free */
        if (!tx_ring->desc)
                return;

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

        tx_ring->desc = NULL;
}

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

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

/**
 * ixgbevf_setup_tx_resources - allocate Tx resources (Descriptors)
 * @tx_ring:    tx descriptor ring (for a specific queue) to setup
 *
 * Return 0 on success, negative on failure
 **/
int ixgbevf_setup_tx_resources(struct ixgbevf_ring *tx_ring)
{
        int size;

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

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

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

        return 0;

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

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

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

        return err;
}

/**
 * ixgbevf_setup_rx_resources - allocate Rx resources (Descriptors)
 * @rx_ring:    rx descriptor ring (for a specific queue) to setup
 *
 * Returns 0 on success, negative on failure
 **/
int ixgbevf_setup_rx_resources(struct ixgbevf_ring *rx_ring)
{
        int size;

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

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

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

        if (!rx_ring->desc)
                goto err;

        return 0;
err:
        vfree(rx_ring->rx_buffer_info);
        rx_ring->rx_buffer_info = NULL;
        dev_err(rx_ring->dev, "Unable to allocate memory for the Rx descriptor ring\n");
        return -ENOMEM;
}

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

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

/**
 * ixgbevf_free_rx_resources - Free Rx Resources
 * @rx_ring: ring to clean the resources from
 *
 * Free all receive software resources
 **/
void ixgbevf_free_rx_resources(struct ixgbevf_ring *rx_ring)
{
        ixgbevf_clean_rx_ring(rx_ring);

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

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

        rx_ring->desc = NULL;
}

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

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

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

        /* A previous failure to open the device because of a lack of
         * available MSIX vector resources may have reset the number
         * of msix vectors variable to zero.  The only way to recover
         * is to unload/reload the driver and hope that the system has
         * been able to recover some MSIX vector resources.
         */
        if (!adapter->num_msix_vectors)
                return -ENOMEM;

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

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

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

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

        ixgbevf_configure(adapter);

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

        ixgbevf_up_complete(adapter);

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

        ixgbevf_irq_enable(adapter);

        return 0;

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

err_setup_reset:

        return err;
}

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

        ixgbevf_down(adapter);
        ixgbevf_free_irq(adapter);

        ixgbevf_free_all_tx_resources(adapter);
        ixgbevf_free_all_rx_resources(adapter);

        return 0;
}

static void ixgbevf_queue_reset_subtask(struct ixgbevf_adapter *adapter)
{
        struct net_device *dev = adapter->netdev;

        if (!(adapter->flags & IXGBEVF_FLAG_QUEUE_RESET_REQUESTED))
                return;

        adapter->flags &= ~IXGBEVF_FLAG_QUEUE_RESET_REQUESTED;

        /* if interface is down do nothing */
        if (test_bit(__IXGBEVF_DOWN, &adapter->state) ||
            test_bit(__IXGBEVF_RESETTING, &adapter->state))
                return;

        /* Hardware has to reinitialize queues and interrupts to
         * match packet buffer alignment. Unfortunately, the
         * hardware is not flexible enough to do this dynamically.
         */
        if (netif_running(dev))
                ixgbevf_close(dev);

        ixgbevf_clear_interrupt_scheme(adapter);
        ixgbevf_init_interrupt_scheme(adapter);

        if (netif_running(dev))
                ixgbevf_open(dev);
}

static void ixgbevf_tx_ctxtdesc(struct ixgbevf_ring *tx_ring,
                                u32 vlan_macip_lens, u32 type_tucmd,
                                u32 mss_l4len_idx)
{
        struct ixgbe_adv_tx_context_desc *context_desc;
        u16 i = tx_ring->next_to_use;

        context_desc = IXGBEVF_TX_CTXTDESC(tx_ring, 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 |= IXGBE_TXD_CMD_DEXT | IXGBE_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);
}

static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
                       struct ixgbevf_tx_buffer *first,
                       u8 *hdr_len)
{
        struct sk_buff *skb = first->skb;
        u32 vlan_macip_lens, type_tucmd;
        u32 mss_l4len_idx, l4len;
        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;

        /* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
        type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;

        if (skb->protocol == htons(ETH_P_IP)) {
                struct iphdr *iph = ip_hdr(skb);
                iph->tot_len = 0;
                iph->check = 0;
                tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
                                                         iph->daddr, 0,
                                                         IPPROTO_TCP,
                                                         0);
                type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
                first->tx_flags |= IXGBE_TX_FLAGS_TSO |
                                   IXGBE_TX_FLAGS_CSUM |
                                   IXGBE_TX_FLAGS_IPV4;
        } else if (skb_is_gso_v6(skb)) {
                ipv6_hdr(skb)->payload_len = 0;
                tcp_hdr(skb)->check =
                    ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
                                     &ipv6_hdr(skb)->daddr,
                                     0, IPPROTO_TCP, 0);
                first->tx_flags |= IXGBE_TX_FLAGS_TSO |
                                   IXGBE_TX_FLAGS_CSUM;
        }

        /* compute header lengths */
        l4len = tcp_hdrlen(skb);
        *hdr_len += l4len;
        *hdr_len = skb_transport_offset(skb) + l4len;

        /* update gso size and bytecount with header size */
        first->gso_segs = skb_shinfo(skb)->gso_segs;
        first->bytecount += (first->gso_segs - 1) * *hdr_len;

        /* mss_l4len_id: use 1 as index for TSO */
        mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
        mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
        mss_l4len_idx |= 1 << IXGBE_ADVTXD_IDX_SHIFT;

        /* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
        vlan_macip_lens = skb_network_header_len(skb);
        vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
        vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

        ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
                            type_tucmd, mss_l4len_idx);

        return 1;
}

static void ixgbevf_tx_csum(struct ixgbevf_ring *tx_ring,
                            struct ixgbevf_tx_buffer *first)
{
        struct sk_buff *skb = first->skb;
        u32 vlan_macip_lens = 0;
        u32 mss_l4len_idx = 0;
        u32 type_tucmd = 0;

        if (skb->ip_summed == CHECKSUM_PARTIAL) {
                u8 l4_hdr = 0;
                switch (skb->protocol) {
                case htons(ETH_P_IP):
                        vlan_macip_lens |= skb_network_header_len(skb);
                        type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
                        l4_hdr = ip_hdr(skb)->protocol;
                        break;
                case htons(ETH_P_IPV6):
                        vlan_macip_lens |= skb_network_header_len(skb);
                        l4_hdr = ipv6_hdr(skb)->nexthdr;
                        break;
                default:
                        if (unlikely(net_ratelimit())) {
                                dev_warn(tx_ring->dev,
                                 "partial checksum but proto=%x!\n",
                                 first->protocol);
                        }
                        break;
                }

                switch (l4_hdr) {
                case IPPROTO_TCP:
                        type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
                        mss_l4len_idx = tcp_hdrlen(skb) <<
                                        IXGBE_ADVTXD_L4LEN_SHIFT;
                        break;
                case IPPROTO_SCTP:
                        type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_SCTP;
                        mss_l4len_idx = sizeof(struct sctphdr) <<
                                        IXGBE_ADVTXD_L4LEN_SHIFT;
                        break;
                case IPPROTO_UDP:
                        mss_l4len_idx = sizeof(struct udphdr) <<
                                        IXGBE_ADVTXD_L4LEN_SHIFT;
                        break;
                default:
                        if (unlikely(net_ratelimit())) {
                                dev_warn(tx_ring->dev,
                                 "partial checksum but l4 proto=%x!\n",
                                 l4_hdr);
                        }
                        break;
                }

                /* update TX checksum flag */
                first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
        }

        /* vlan_macip_lens: MACLEN, VLAN tag */
        vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
        vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

        ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
                            type_tucmd, mss_l4len_idx);
}

static __le32 ixgbevf_tx_cmd_type(u32 tx_flags)
{
        /* set type for advanced descriptor with frame checksum insertion */
        __le32 cmd_type = cpu_to_le32(IXGBE_ADVTXD_DTYP_DATA |
                                      IXGBE_ADVTXD_DCMD_IFCS |
                                      IXGBE_ADVTXD_DCMD_DEXT);

        /* set HW vlan bit if vlan is present */
        if (tx_flags & IXGBE_TX_FLAGS_VLAN)
                cmd_type |= cpu_to_le32(IXGBE_ADVTXD_DCMD_VLE);

        /* set segmentation enable bits for TSO/FSO */
        if (tx_flags & IXGBE_TX_FLAGS_TSO)
                cmd_type |= cpu_to_le32(IXGBE_ADVTXD_DCMD_TSE);

        return cmd_type;
}

static void ixgbevf_tx_olinfo_status(union ixgbe_adv_tx_desc *tx_desc,
                                     u32 tx_flags, unsigned int paylen)
{
        __le32 olinfo_status = cpu_to_le32(paylen << IXGBE_ADVTXD_PAYLEN_SHIFT);

        /* enable L4 checksum for TSO and TX checksum offload */
        if (tx_flags & IXGBE_TX_FLAGS_CSUM)
                olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_TXSM);

        /* enble IPv4 checksum for TSO */
        if (tx_flags & IXGBE_TX_FLAGS_IPV4)
                olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_POPTS_IXSM);

        /* use index 1 context for TSO/FSO/FCOE */
        if (tx_flags & IXGBE_TX_FLAGS_TSO)
                olinfo_status |= cpu_to_le32(1 << IXGBE_ADVTXD_IDX_SHIFT);

        /* Check Context must be set if Tx switch is enabled, which it
         * always is for case where virtual functions are running
         */
        olinfo_status |= cpu_to_le32(IXGBE_ADVTXD_CC);

        tx_desc->read.olinfo_status = olinfo_status;
}

static void ixgbevf_tx_map(struct ixgbevf_ring *tx_ring,
                           struct ixgbevf_tx_buffer *first,
                           const u8 hdr_len)
{
        dma_addr_t dma;
        struct sk_buff *skb = first->skb;
        struct ixgbevf_tx_buffer *tx_buffer;
        union ixgbe_adv_tx_desc *tx_desc;
        struct skb_frag_struct *frag = &skb_shinfo(skb)->frags[0];
        unsigned int data_len = skb->data_len;
        unsigned int size = skb_headlen(skb);
        unsigned int paylen = skb->len - hdr_len;
        u32 tx_flags = first->tx_flags;
        __le32 cmd_type;
        u16 i = tx_ring->next_to_use;

        tx_desc = IXGBEVF_TX_DESC(tx_ring, i);

        ixgbevf_tx_olinfo_status(tx_desc, tx_flags, paylen);
        cmd_type = ixgbevf_tx_cmd_type(tx_flags);

        dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
        if (dma_mapping_error(tx_ring->dev, dma))
                goto dma_error;

        /* record length, and DMA address */
        dma_unmap_len_set(first, len, size);
        dma_unmap_addr_set(first, dma, dma);

        tx_desc->read.buffer_addr = cpu_to_le64(dma);

        for (;;) {
                while (unlikely(size > IXGBE_MAX_DATA_PER_TXD)) {
                        tx_desc->read.cmd_type_len =
                                cmd_type | cpu_to_le32(IXGBE_MAX_DATA_PER_TXD);

                        i++;
                        tx_desc++;
                        if (i == tx_ring->count) {
                                tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
                                i = 0;
                        }

                        dma += IXGBE_MAX_DATA_PER_TXD;
                        size -= IXGBE_MAX_DATA_PER_TXD;

                        tx_desc->read.buffer_addr = cpu_to_le64(dma);
                        tx_desc->read.olinfo_status = 0;
                }

                if (likely(!data_len))
                        break;

                tx_desc->read.cmd_type_len = cmd_type | cpu_to_le32(size);

                i++;
                tx_desc++;
                if (i == tx_ring->count) {
                        tx_desc = IXGBEVF_TX_DESC(tx_ring, 0);
                        i = 0;
                }

                size = skb_frag_size(frag);
                data_len -= size;

                dma = skb_frag_dma_map(tx_ring->dev, frag, 0, size,
                                       DMA_TO_DEVICE);
                if (dma_mapping_error(tx_ring->dev, dma))
                        goto dma_error;

                tx_buffer = &tx_ring->tx_buffer_info[i];
                dma_unmap_len_set(tx_buffer, len, size);
                dma_unmap_addr_set(tx_buffer, dma, dma);

                tx_desc->read.buffer_addr = cpu_to_le64(dma);
                tx_desc->read.olinfo_status = 0;

                frag++;
        }

        /* write last descriptor with RS and EOP bits */
        cmd_type |= cpu_to_le32(size) | cpu_to_le32(IXGBE_TXD_CMD);
        tx_desc->read.cmd_type_len = cmd_type;

        /* set the timestamp */
        first->time_stamp = jiffies;

        /* 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).
         *
         * We also need this memory barrier (wmb) to make certain all of the
         * status bits have been updated before next_to_watch is written.
         */
        wmb();

        /* set next_to_watch value indicating a packet is present */
        first->next_to_watch = tx_desc;

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

        tx_ring->next_to_use = i;

        /* notify HW of packet */
        ixgbevf_write_tail(tx_ring, i);

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

        /* clear dma mappings for failed tx_buffer_info map */
        for (;;) {
                tx_buffer = &tx_ring->tx_buffer_info[i];
                ixgbevf_unmap_and_free_tx_resource(tx_ring, tx_buffer);
                if (tx_buffer == first)
                        break;
                if (i == 0)
                        i = tx_ring->count;
                i--;
        }

        tx_ring->next_to_use = i;
}

static int __ixgbevf_maybe_stop_tx(struct ixgbevf_ring *tx_ring, int size)
{
        netif_stop_subqueue(tx_ring->netdev, tx_ring->queue_index);
        /* 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 in a case another CPU has just
         * made room available. */
        if (likely(ixgbevf_desc_unused(tx_ring) < size))
                return -EBUSY;

        /* A reprieve! - use start_queue because it doesn't call schedule */
        netif_start_subqueue(tx_ring->netdev, tx_ring->queue_index);
        ++tx_ring->tx_stats.restart_queue;

        return 0;
}

static int ixgbevf_maybe_stop_tx(struct ixgbevf_ring *tx_ring, int size)
{
        if (likely(ixgbevf_desc_unused(tx_ring) >= size))
                return 0;
        return __ixgbevf_maybe_stop_tx(tx_ring, size);
}

static int ixgbevf_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbevf_tx_buffer *first;
        struct ixgbevf_ring *tx_ring;
        int tso;
        u32 tx_flags = 0;
        u16 count = TXD_USE_COUNT(skb_headlen(skb));
#if PAGE_SIZE > IXGBE_MAX_DATA_PER_TXD
        unsigned short f;
#endif
        u8 hdr_len = 0;
        u8 *dst_mac = skb_header_pointer(skb, 0, 0, NULL);

        if (!dst_mac || is_link_local_ether_addr(dst_mac)) {
                dev_kfree_skb(skb);
                return NETDEV_TX_OK;
        }

        tx_ring = adapter->tx_ring[skb->queue_mapping];

        /*
         * need: 1 descriptor per page * PAGE_SIZE/IXGBE_MAX_DATA_PER_TXD,
         *       + 1 desc for skb_headlen/IXGBE_MAX_DATA_PER_TXD,
         *       + 2 desc gap to keep tail from touching head,
         *       + 1 desc for context descriptor,
         * otherwise try next time
         */
#if PAGE_SIZE > IXGBE_MAX_DATA_PER_TXD
        for (f = 0; f < skb_shinfo(skb)->nr_frags; f++)
                count += TXD_USE_COUNT(skb_shinfo(skb)->frags[f].size);
#else
        count += skb_shinfo(skb)->nr_frags;
#endif
        if (ixgbevf_maybe_stop_tx(tx_ring, count + 3)) {
                tx_ring->tx_stats.tx_busy++;
                return NETDEV_TX_BUSY;
        }

        /* record the location of the first descriptor for this packet */
        first = &tx_ring->tx_buffer_info[tx_ring->next_to_use];
        first->skb = skb;
        first->bytecount = skb->len;
        first->gso_segs = 1;

        if (vlan_tx_tag_present(skb)) {
                tx_flags |= vlan_tx_tag_get(skb);
                tx_flags <<= IXGBE_TX_FLAGS_VLAN_SHIFT;
                tx_flags |= IXGBE_TX_FLAGS_VLAN;
        }

        /* record initial flags and protocol */
        first->tx_flags = tx_flags;
        first->protocol = vlan_get_protocol(skb);

        tso = ixgbevf_tso(tx_ring, first, &hdr_len);
        if (tso < 0)
                goto out_drop;
        else if (!tso)
                ixgbevf_tx_csum(tx_ring, first);

        ixgbevf_tx_map(tx_ring, first, hdr_len);

        ixgbevf_maybe_stop_tx(tx_ring, DESC_NEEDED);

        return NETDEV_TX_OK;

out_drop:
        dev_kfree_skb_any(first->skb);
        first->skb = NULL;

        return NETDEV_TX_OK;
}

/**
 * ixgbevf_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 ixgbevf_set_mac(struct net_device *netdev, void *p)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        struct sockaddr *addr = p;

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

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

        spin_lock_bh(&adapter->mbx_lock);

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

        spin_unlock_bh(&adapter->mbx_lock);

        return 0;
}

/**
 * ixgbevf_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 ixgbevf_change_mtu(struct net_device *netdev, int new_mtu)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        struct ixgbe_hw *hw = &adapter->hw;
        int max_frame = new_mtu + ETH_HLEN + ETH_FCS_LEN;
        int max_possible_frame = MAXIMUM_ETHERNET_VLAN_SIZE;

        switch (adapter->hw.api_version) {
        case ixgbe_mbox_api_11:
                max_possible_frame = IXGBE_MAX_JUMBO_FRAME_SIZE;
                break;
        default:
                if (adapter->hw.mac.type == ixgbe_mac_X540_vf)
                        max_possible_frame = IXGBE_MAX_JUMBO_FRAME_SIZE;
                break;
        }

        /* MTU < 68 is an error and causes problems on some kernels */
        if ((new_mtu < 68) || (max_frame > max_possible_frame))
                return -EINVAL;

        hw_dbg(hw, "changing MTU from %d to %d\n",
               netdev->mtu, new_mtu);
        /* must set new MTU before calling down or up */
        netdev->mtu = new_mtu;

        /* notify the PF of our intent to use this size of frame */
        ixgbevf_rlpml_set_vf(hw, max_frame);

        return 0;
}

#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 ixgbevf_netpoll(struct net_device *netdev)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        int i;

        /* if interface is down do nothing */
        if (test_bit(__IXGBEVF_DOWN, &adapter->state))
                return;
        for (i = 0; i < adapter->num_rx_queues; i++)
                ixgbevf_msix_clean_rings(0, adapter->q_vector[i]);
}
#endif /* CONFIG_NET_POLL_CONTROLLER */

static int ixgbevf_suspend(struct pci_dev *pdev, pm_message_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
#ifdef CONFIG_PM
        int retval = 0;
#endif

        netif_device_detach(netdev);

        if (netif_running(netdev)) {
                rtnl_lock();
                ixgbevf_down(adapter);
                ixgbevf_free_irq(adapter);
                ixgbevf_free_all_tx_resources(adapter);
                ixgbevf_free_all_rx_resources(adapter);
                rtnl_unlock();
        }

        ixgbevf_clear_interrupt_scheme(adapter);

#ifdef CONFIG_PM
        retval = pci_save_state(pdev);
        if (retval)
                return retval;

#endif
        if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
                pci_disable_device(pdev);

        return 0;
}

#ifdef CONFIG_PM
static int ixgbevf_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        u32 err;

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

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

        ixgbevf_reset(adapter);

        rtnl_lock();
        err = ixgbevf_init_interrupt_scheme(adapter);
        rtnl_unlock();
        if (err) {
                dev_err(&pdev->dev, "Cannot initialize interrupts\n");
                return err;
        }

        if (netif_running(netdev)) {
                err = ixgbevf_open(netdev);
                if (err)
                        return err;
        }

        netif_device_attach(netdev);

        return err;
}

#endif /* CONFIG_PM */
static void ixgbevf_shutdown(struct pci_dev *pdev)
{
        ixgbevf_suspend(pdev, PMSG_SUSPEND);
}

static struct rtnl_link_stats64 *ixgbevf_get_stats(struct net_device *netdev,
                                                struct rtnl_link_stats64 *stats)
{
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);
        unsigned int start;
        u64 bytes, packets;
        const struct ixgbevf_ring *ring;
        int i;

        ixgbevf_update_stats(adapter);

        stats->multicast = adapter->stats.vfmprc - adapter->stats.base_vfmprc;

        for (i = 0; i < adapter->num_rx_queues; i++) {
                ring = adapter->rx_ring[i];
                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        bytes = ring->stats.bytes;
                        packets = ring->stats.packets;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));
                stats->rx_bytes += bytes;
                stats->rx_packets += packets;
        }

        for (i = 0; i < adapter->num_tx_queues; i++) {
                ring = adapter->tx_ring[i];
                do {
                        start = u64_stats_fetch_begin_irq(&ring->syncp);
                        bytes = ring->stats.bytes;
                        packets = ring->stats.packets;
                } while (u64_stats_fetch_retry_irq(&ring->syncp, start));
                stats->tx_bytes += bytes;
                stats->tx_packets += packets;
        }

        return stats;
}

static const struct net_device_ops ixgbevf_netdev_ops = {
        .ndo_open               = ixgbevf_open,
        .ndo_stop               = ixgbevf_close,
        .ndo_start_xmit         = ixgbevf_xmit_frame,
        .ndo_set_rx_mode        = ixgbevf_set_rx_mode,
        .ndo_get_stats64        = ixgbevf_get_stats,
        .ndo_validate_addr      = eth_validate_addr,
        .ndo_set_mac_address    = ixgbevf_set_mac,
        .ndo_change_mtu         = ixgbevf_change_mtu,
        .ndo_tx_timeout         = ixgbevf_tx_timeout,
        .ndo_vlan_rx_add_vid    = ixgbevf_vlan_rx_add_vid,
        .ndo_vlan_rx_kill_vid   = ixgbevf_vlan_rx_kill_vid,
#ifdef CONFIG_NET_RX_BUSY_POLL
        .ndo_busy_poll          = ixgbevf_busy_poll_recv,
#endif
#ifdef CONFIG_NET_POLL_CONTROLLER
        .ndo_poll_controller    = ixgbevf_netpoll,
#endif
};

static void ixgbevf_assign_netdev_ops(struct net_device *dev)
{
        dev->netdev_ops = &ixgbevf_netdev_ops;
        ixgbevf_set_ethtool_ops(dev);
        dev->watchdog_timeo = 5 * HZ;
}

/**
 * ixgbevf_probe - Device Initialization Routine
 * @pdev: PCI device information struct
 * @ent: entry in ixgbevf_pci_tbl
 *
 * Returns 0 on success, negative on failure
 *
 * ixgbevf_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 ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
        struct net_device *netdev;
        struct ixgbevf_adapter *adapter = NULL;
        struct ixgbe_hw *hw = NULL;
        const struct ixgbevf_info *ii = ixgbevf_info_tbl[ent->driver_data];
        int err, pci_using_dac;

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

        if (!dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64))) {
                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;
                }
                pci_using_dac = 0;
        }

        err = pci_request_regions(pdev, ixgbevf_driver_name);
        if (err) {
                dev_err(&pdev->dev, "pci_request_regions failed 0x%x\n", err);
                goto err_pci_reg;
        }

        pci_set_master(pdev);

        netdev = alloc_etherdev_mq(sizeof(struct ixgbevf_adapter),
                                   MAX_TX_QUEUES);
        if (!netdev) {
                err = -ENOMEM;
                goto err_alloc_etherdev;
        }

        SET_NETDEV_DEV(netdev, &pdev->dev);

        pci_set_drvdata(pdev, netdev);
        adapter = netdev_priv(netdev);

        adapter->netdev = netdev;
        adapter->pdev = pdev;
        hw = &adapter->hw;
        hw->back = adapter;
        adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);

        /*
         * call save state here in standalone driver because it relies on
         * adapter struct to exist, and needs to call netdev_priv
         */
        pci_save_state(pdev);

        hw->hw_addr = ioremap(pci_resource_start(pdev, 0),
                              pci_resource_len(pdev, 0));
        adapter->io_addr = hw->hw_addr;
        if (!hw->hw_addr) {
                err = -EIO;
                goto err_ioremap;
        }

        ixgbevf_assign_netdev_ops(netdev);

        /* Setup hw api */
        memcpy(&hw->mac.ops, ii->mac_ops, sizeof(hw->mac.ops));
        hw->mac.type  = ii->mac;

        memcpy(&hw->mbx.ops, &ixgbevf_mbx_ops,
               sizeof(struct ixgbe_mbx_operations));

        /* setup the private structure */
        err = ixgbevf_sw_init(adapter);
        if (err)
                goto err_sw_init;

        /* The HW MAC address was set and/or determined in sw_init */
        if (!is_valid_ether_addr(netdev->dev_addr)) {
                pr_err("invalid MAC address\n");
                err = -EIO;
                goto err_sw_init;
        }

        netdev->hw_features = NETIF_F_SG |
                           NETIF_F_IP_CSUM |
                           NETIF_F_IPV6_CSUM |
                           NETIF_F_TSO |
                           NETIF_F_TSO6 |
                           NETIF_F_RXCSUM;

        netdev->features = netdev->hw_features |
                           NETIF_F_HW_VLAN_CTAG_TX |
                           NETIF_F_HW_VLAN_CTAG_RX |
                           NETIF_F_HW_VLAN_CTAG_FILTER;

        netdev->vlan_features |= NETIF_F_TSO;
        netdev->vlan_features |= NETIF_F_TSO6;
        netdev->vlan_features |= NETIF_F_IP_CSUM;
        netdev->vlan_features |= NETIF_F_IPV6_CSUM;
        netdev->vlan_features |= NETIF_F_SG;

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

        netdev->priv_flags |= IFF_UNICAST_FLT;

        init_timer(&adapter->watchdog_timer);
        adapter->watchdog_timer.function = ixgbevf_watchdog;
        adapter->watchdog_timer.data = (unsigned long)adapter;

        if (IXGBE_REMOVED(hw->hw_addr)) {
                err = -EIO;
                goto err_sw_init;
        }
        INIT_WORK(&adapter->reset_task, ixgbevf_reset_task);
        INIT_WORK(&adapter->watchdog_task, ixgbevf_watchdog_task);
        set_bit(__IXGBEVF_WORK_INIT, &adapter->state);

        err = ixgbevf_init_interrupt_scheme(adapter);
        if (err)
                goto err_sw_init;

        strcpy(netdev->name, "eth%d");

        err = register_netdev(netdev);
        if (err)
                goto err_register;

        netif_carrier_off(netdev);

        ixgbevf_init_last_counter_stats(adapter);

        /* print the MAC address */
        hw_dbg(hw, "%pM\n", netdev->dev_addr);

        hw_dbg(hw, "MAC: %d\n", hw->mac.type);

        hw_dbg(hw, "Intel(R) 82599 Virtual Function\n");
        return 0;

err_register:
        ixgbevf_clear_interrupt_scheme(adapter);
err_sw_init:
        ixgbevf_reset_interrupt_capability(adapter);
        iounmap(adapter->io_addr);
err_ioremap:
        free_netdev(netdev);
err_alloc_etherdev:
        pci_release_regions(pdev);
err_pci_reg:
err_dma:
        if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
                pci_disable_device(pdev);
        return err;
}

/**
 * ixgbevf_remove - Device Removal Routine
 * @pdev: PCI device information struct
 *
 * ixgbevf_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 ixgbevf_remove(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);

        set_bit(__IXGBEVF_REMOVING, &adapter->state);

        del_timer_sync(&adapter->watchdog_timer);

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

        if (netdev->reg_state == NETREG_REGISTERED)
                unregister_netdev(netdev);

        ixgbevf_clear_interrupt_scheme(adapter);
        ixgbevf_reset_interrupt_capability(adapter);

        iounmap(adapter->io_addr);
        pci_release_regions(pdev);

        hw_dbg(&adapter->hw, "Remove complete\n");

        free_netdev(netdev);

        if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
                pci_disable_device(pdev);
}

/**
 * ixgbevf_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 ixgbevf_io_error_detected(struct pci_dev *pdev,
                                                  pci_channel_state_t state)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);

        if (!test_bit(__IXGBEVF_WORK_INIT, &adapter->state))
                return PCI_ERS_RESULT_DISCONNECT;

        rtnl_lock();
        netif_device_detach(netdev);

        if (state == pci_channel_io_perm_failure) {
                rtnl_unlock();
                return PCI_ERS_RESULT_DISCONNECT;
        }

        if (netif_running(netdev))
                ixgbevf_down(adapter);

        if (!test_and_set_bit(__IXGBEVF_DISABLED, &adapter->state))
                pci_disable_device(pdev);
        rtnl_unlock();

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

/**
 * ixgbevf_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 ixgbevf_resume routine.
 */
static pci_ers_result_t ixgbevf_io_slot_reset(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_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;
        }

        smp_mb__before_atomic();
        clear_bit(__IXGBEVF_DISABLED, &adapter->state);
        pci_set_master(pdev);

        ixgbevf_reset(adapter);

        return PCI_ERS_RESULT_RECOVERED;
}

/**
 * ixgbevf_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 ixgbevf_resume routine.
 */
static void ixgbevf_io_resume(struct pci_dev *pdev)
{
        struct net_device *netdev = pci_get_drvdata(pdev);
        struct ixgbevf_adapter *adapter = netdev_priv(netdev);

        if (netif_running(netdev))
                ixgbevf_up(adapter);

        netif_device_attach(netdev);
}

/* PCI Error Recovery (ERS) */
static const struct pci_error_handlers ixgbevf_err_handler = {
        .error_detected = ixgbevf_io_error_detected,
        .slot_reset = ixgbevf_io_slot_reset,
        .resume = ixgbevf_io_resume,
};

static struct pci_driver ixgbevf_driver = {
        .name     = ixgbevf_driver_name,
        .id_table = ixgbevf_pci_tbl,
        .probe    = ixgbevf_probe,
        .remove   = ixgbevf_remove,
#ifdef CONFIG_PM
        /* Power Management Hooks */
        .suspend  = ixgbevf_suspend,
        .resume   = ixgbevf_resume,
#endif
        .shutdown = ixgbevf_shutdown,
        .err_handler = &ixgbevf_err_handler
};

/**
 * ixgbevf_init_module - Driver Registration Routine
 *
 * ixgbevf_init_module is the first routine called when the driver is
 * loaded. All it does is register with the PCI subsystem.
 **/
static int __init ixgbevf_init_module(void)
{
        int ret;
        pr_info("%s - version %s\n", ixgbevf_driver_string,
                ixgbevf_driver_version);

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

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

module_init(ixgbevf_init_module);

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

#ifdef DEBUG
/**
 * ixgbevf_get_hw_dev_name - return device name string
 * used by hardware layer to print debugging information
 **/
char *ixgbevf_get_hw_dev_name(struct ixgbe_hw *hw)
{
        struct ixgbevf_adapter *adapter = hw->back;
        return adapter->netdev->name;
}

#endif
module_exit(ixgbevf_exit_module);

/* ixgbevf_main.c */