xref: /linux/drivers/net/ethernet/intel/igbvf/netdev.c (revision f7c595c9d9f4cce9ec335f0d3c5d875bb547f9d5)

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

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

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

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

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

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

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

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

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

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

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

/**
 * igbvf_receive_skb - helper function to handle Rx indications
 * @adapter: board private structure
 * @netdev: pointer to netdev struct
 * @skb: skb to indicate to stack
 * @status: descriptor status field as written by hardware
 * @vlan: descriptor vlan field as written by hardware (no le/be conversion)
 * @skb: pointer to sk_buff to be indicated to stack
 **/
static void igbvf_receive_skb(struct igbvf_adapter *adapter,
			      struct net_device *netdev,
			      struct sk_buff *skb,
			      u32 status, __le16 vlan)
{
	u16 vid;

	if (status & E1000_RXD_STAT_VP) {
		if ((adapter->flags & IGBVF_FLAG_RX_LB_VLAN_BSWAP) &&
		    (status & E1000_RXDEXT_STATERR_LB))
			vid = be16_to_cpu((__force __be16)vlan) & E1000_RXD_SPC_VLAN_MASK;
		else
			vid = le16_to_cpu(vlan) & E1000_RXD_SPC_VLAN_MASK;
		if (test_bit(vid, adapter->active_vlans))
			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vid);
	}

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

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

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

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

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

	adapter->hw_csum_good++;
}

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

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

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

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

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

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

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

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

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

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

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

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

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

		buffer_info = &rx_ring->buffer_info[i];

		/* HW will not DMA in data larger than the given buffer, even
		 * if it parses the (NFS, of course) header to be larger.  In
		 * that case, it fills the header buffer and spills the rest
		 * into the page.
		 */
		hlen = le16_get_bits(rx_desc->wb.lower.lo_dword.hs_rss.hdr_info,
				     E1000_RXDADV_HDRBUFLEN_MASK);
		if (hlen > adapter->rx_ps_hdr_size)
			hlen = adapter->rx_ps_hdr_size;

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

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

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

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

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

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

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

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

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

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

		igbvf_rx_checksum_adv(adapter, staterr, skb);

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

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

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

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

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

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

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

	if (cleaned_count)
		igbvf_alloc_rx_buffers(rx_ring, cleaned_count);

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

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

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

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

	/* round up to nearest 4K */
	tx_ring->size = tx_ring->count * sizeof(union e1000_adv_tx_desc);
	tx_ring->size = ALIGN(tx_ring->size, 4096);

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

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

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

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

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

	desc_len = sizeof(union e1000_adv_rx_desc);

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

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

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

	rx_ring->adapter = adapter;

	return 0;

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

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

	if (!tx_ring->buffer_info)
		return;

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

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

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

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

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

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

	igbvf_clean_tx_ring(tx_ring);

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

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

	tx_ring->desc = NULL;
}

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

	if (!rx_ring->buffer_info)
		return;

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

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

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

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

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

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

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

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

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

	igbvf_clean_rx_ring(rx_ring);

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

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

/**
 * igbvf_update_itr - update the dynamic ITR value based on statistics
 * @adapter: pointer to adapter
 * @itr_setting: current adapter->itr
 * @packets: the number of packets during this measurement interval
 * @bytes: the number of bytes during this measurement interval
 *
 * Stores a new ITR value based on packets and byte counts during the last
 * interrupt.  The advantage of per interrupt computation is faster updates
 * and more accurate ITR for the current traffic pattern.  Constants in this
 * function were computed based on theoretical maximum wire speed and thresholds
 * were set based on testing data as well as attempting to minimize response
 * time while increasing bulk throughput.
 **/
static enum latency_range igbvf_update_itr(struct igbvf_adapter *adapter,
					   enum latency_range itr_setting,
					   int packets, int bytes)
{
	enum latency_range retval = itr_setting;

	if (packets == 0)
		goto update_itr_done;

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

update_itr_done:
	return retval;
}

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

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

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

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

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

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

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

		adapter->tx_ring->set_itr = 1;
	}

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

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

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

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

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

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

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

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

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

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

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

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

			if (skb) {
				unsigned int segs, bytecount;

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

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

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

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

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

	tx_ring->next_to_clean = i;

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

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

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

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

	ew32(EIMS, adapter->eims_other);

	return IRQ_HANDLED;
}

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

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

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

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

	return IRQ_HANDLED;
}

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

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

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

	return IRQ_HANDLED;
}

#define IGBVF_NO_QUEUE -1

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

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

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

	adapter->eims_enable_mask = 0;

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

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

	tmp = (vector++ | E1000_IVAR_VALID);

	ew32(IVAR_MISC, tmp);

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

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

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

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

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

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

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

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

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

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

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

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

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

	igbvf_configure_msix(adapter);
	return 0;
free_irq_rx:
	free_irq(adapter->msix_entries[--vector].vector, netdev);
free_irq_tx:
	free_irq(adapter->msix_entries[--vector].vector, netdev);
out:
	return err;
}

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

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

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

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

	return 0;
}

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

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

	if (!err)
		return err;

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

	return err;
}

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

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

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

	ew32(EIMC, ~0);

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

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

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

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

	igbvf_clean_rx_irq(adapter, &work_done, budget);

	if (work_done == budget)
		return budget;

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

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

	return work_done;
}

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

	max_frame_size = adapter->max_frame_size + VLAN_TAG_SIZE;

	spin_lock_bh(&hw->mbx_lock);

	e1000_rlpml_set_vf(hw, max_frame_size);

	spin_unlock_bh(&hw->mbx_lock);
}

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

	spin_lock_bh(&hw->mbx_lock);

	if (hw->mac.ops.set_vfta(hw, vid, true)) {
		dev_warn(&adapter->pdev->dev, "Vlan id %d\n is not added", vid);
		spin_unlock_bh(&hw->mbx_lock);
		return -EINVAL;
	}

	spin_unlock_bh(&hw->mbx_lock);

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	spin_unlock_bh(&hw->mbx_lock);

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	ew32(SRRCTL(0), srrctl);
}

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

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

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

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

	igbvf_set_rlpml(adapter);

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

/**
 * igbvf_set_multi - Multicast and Promiscuous mode set
 * @netdev: network interface device structure
 *
 * The set_multi entry point is called whenever the multicast address
 * list or the network interface flags are updated.  This routine is
 * responsible for configuring the hardware for proper multicast,
 * promiscuous mode, and all-multi behavior.
 **/
static void igbvf_set_multi(struct net_device *netdev)
{
	struct igbvf_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	struct netdev_hw_addr *ha;
	u8  *mta_list = NULL;
	int i;

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

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

	spin_lock_bh(&hw->mbx_lock);

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

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

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	spin_unlock_bh(&hw->mbx_lock);

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

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

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

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

	return 0;
}

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

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

	igbvf_restore_vlan(adapter);

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	mac->ops.init_hw(hw);

	spin_unlock_bh(&hw->mbx_lock);

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

	adapter->last_reset = jiffies;
}

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

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

	clear_bit(__IGBVF_DOWN, &adapter->state);

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

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

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

	return 0;
}

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

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

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

	netif_carrier_off(netdev);
	netif_stop_queue(netdev);

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

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

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

	igbvf_irq_disable(adapter);

	timer_delete_sync(&adapter->watchdog_timer);

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

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

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

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

/**
 * igbvf_sw_init - Initialize general software structures (struct igbvf_adapter)
 * @adapter: board private structure to initialize
 *
 * igbvf_sw_init initializes the Adapter private data structure.
 * Fields are initialized based on PCI device information and
 * OS network device settings (MTU size).
 **/
static int igbvf_sw_init(struct igbvf_adapter *adapter)
{
	struct net_device *netdev = adapter->netdev;
	s32 rc;

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

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

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

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

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

	igbvf_set_interrupt_capability(adapter);

	if (igbvf_alloc_queues(adapter))
		return -ENOMEM;

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

	spin_lock_init(&adapter->hw.mbx_lock);

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

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

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

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

/**
 * igbvf_open - Called when a network interface is made active
 * @netdev: network interface device structure
 *
 * Returns 0 on success, negative value on failure
 *
 * The open entry point is called when a network interface is made
 * active by the system (IFF_UP).  At this point all resources needed
 * for transmit and receive operations are allocated, the interrupt
 * handler is registered with the OS, the watchdog timer is started,
 * and the stack is notified that the interface is ready.
 **/
static int igbvf_open(struct net_device *netdev)
{
	struct igbvf_adapter *adapter = netdev_priv(netdev);
	struct e1000_hw *hw = &adapter->hw;
	int err;

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

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

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

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

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

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

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

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

	igbvf_irq_enable(adapter);

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

	return 0;

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

	return err;
}

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

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

	igbvf_free_irq(adapter);

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

	return 0;
}

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

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	spin_unlock_bh(&hw->mbx_lock);

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

	eth_hw_addr_set(netdev, addr->sa_data);

	return 0;
}

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

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

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

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

	if (pci_channel_offline(pdev))
		return;

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

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

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

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	spin_unlock_bh(&hw->mbx_lock);

	link_active = !hw->mac.get_link_status;

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

	return link_active;
}

/**
 * igbvf_watchdog - Timer Call-back
 * @t: timer list pointer containing private struct
 **/
static void igbvf_watchdog(struct timer_list *t)
{
	struct igbvf_adapter *adapter = timer_container_of(adapter, t,
							   watchdog_timer);

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

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

	link = igbvf_has_link(adapter);

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

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

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

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

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

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

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

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

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

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

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

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

static int igbvf_tso(struct igbvf_ring *tx_ring,
		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
{
	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
	union {
		struct iphdr *v4;
		struct ipv6hdr *v6;
		unsigned char *hdr;
	} ip;
	union {
		struct tcphdr *tcp;
		unsigned char *hdr;
	} l4;
	u32 paylen, l4_offset;
	int err;

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

	if (!skb_is_gso(skb))
		return 0;

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

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

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

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

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

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

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

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

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

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

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

	igbvf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, mss_l4len_idx);

	return 1;
}

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

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

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

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

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

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

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

	netif_stop_queue(netdev);

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

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

	netif_wake_queue(netdev);

	++adapter->restart_queue;
	return 0;
}

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

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

	i = tx_ring->next_to_use;

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

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

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

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

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

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

	return ++count;

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

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

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

	return 0;
}

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

	cmd_type_len = (E1000_ADVTXD_DTYP_DATA | E1000_ADVTXD_DCMD_IFCS |
			E1000_ADVTXD_DCMD_DEXT);

	if (tx_flags & IGBVF_TX_FLAGS_VLAN)
		cmd_type_len |= E1000_ADVTXD_DCMD_VLE;

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

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

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

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

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

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

	tx_desc->read.cmd_type_len |= cpu_to_le32(adapter->txd_cmd);
	/* Force memory writes to complete before letting h/w
	 * know there are new descriptors to fetch.  (Only
	 * applicable for weak-ordered memory model archs,
	 * such as IA-64).
	 */
	wmb();

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

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

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

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

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

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

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

	first = tx_ring->next_to_use;

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

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

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

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

	return NETDEV_TX_OK;
}

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

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

	tx_ring = &adapter->tx_ring[0];

	return igbvf_xmit_frame_ring_adv(skb, netdev, tx_ring);
}

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

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

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

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

	igbvf_reinit_locked(adapter);
}

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

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

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

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

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

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

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

	clear_bit(__IGBVF_RESETTING, &adapter->state);

	return 0;
}

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

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

	netif_device_detach(netdev);

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

	return 0;
}

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

	pci_set_master(pdev);

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

	igbvf_reset(adapter);

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

	netif_device_attach(netdev);

	return 0;
}

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

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

	disable_irq(adapter->pdev->irq);

	igbvf_clean_tx_irq(adapter->tx_ring);

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

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

	netif_device_detach(netdev);

	if (state == pci_channel_io_perm_failure)
		return PCI_ERS_RESULT_DISCONNECT;

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

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

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

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

	igbvf_reset(adapter);

	return PCI_ERS_RESULT_RECOVERED;
}

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

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

	netif_device_attach(netdev);
}

/**
 * igbvf_io_prepare - prepare device driver for PCI reset
 * @pdev: PCI device information struct
 */
static void igbvf_io_prepare(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct igbvf_adapter *adapter = netdev_priv(netdev);

	while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
		usleep_range(1000, 2000);
	igbvf_down(adapter);
}

/**
 * igbvf_io_reset_done - PCI reset done, device driver reset can begin
 * @pdev: PCI device information struct
 */
static void igbvf_io_reset_done(struct pci_dev *pdev)
{
	struct net_device *netdev = pci_get_drvdata(pdev);
	struct igbvf_adapter *adapter = netdev_priv(netdev);

	igbvf_up(adapter);
	clear_bit(__IGBVF_RESETTING, &adapter->state);
}

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

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

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

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

	return 0;
}

#define IGBVF_MAX_MAC_HDR_LEN		127
#define IGBVF_MAX_NETWORK_HDR_LEN	511

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

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

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

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

	return features;
}

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

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

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

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

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

	pci_set_master(pdev);

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

	SET_NETDEV_DEV(netdev, &pdev->dev);

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

	/* PCI config space info */

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

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

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

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

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

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

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

	adapter->bd_number = cards_found++;

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

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

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

	netdev->features = netdev->hw_features | NETIF_F_HIGHDMA;

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

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

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

	spin_lock_bh(&hw->mbx_lock);

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

	spin_unlock_bh(&hw->mbx_lock);

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

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

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

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

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

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

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

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

	igbvf_print_device_info(adapter);

	igbvf_initialize_last_counter_stats(adapter);

	return 0;

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

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

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

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

	unregister_netdev(netdev);

	igbvf_reset_interrupt_capability(adapter);

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

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

	free_netdev(netdev);

	pci_disable_device(pdev);
}

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

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

static DEFINE_SIMPLE_DEV_PM_OPS(igbvf_pm_ops, igbvf_suspend, igbvf_resume);

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

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

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

	ret = pci_register_driver(&igbvf_driver);

	return ret;
}
module_init(igbvf_init_module);

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

MODULE_DESCRIPTION("Intel(R) Gigabit Virtual Function Network Driver");
MODULE_LICENSE("GPL v2");

/* netdev.c */