text: // SPDX-License-Identifier: GPL-2.0
  /* Copyright(c) 2009 - 2018 Intel Corporation. */
  
  #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  
  #include <linux/module.h>
  #include <linux/types.h>
  #include <linux/init.h>
  #include <linux/pci.h>
  #include <linux/vmalloc.h>
  #include <linux/pagemap.h>
  #include <linux/delay.h>
  #include <linux/netdevice.h>
  #include <linux/tcp.h>
  #include <linux/ipv6.h>
  #include <linux/slab.h>
  #include <net/checksum.h>
  #include <net/ip6_checksum.h>
  #include <linux/mii.h>
  #include <linux/ethtool.h>
  #include <linux/if_vlan.h>
  #include <linux/prefetch.h>
  #include <linux/sctp.h>
  
  #include "igbvf.h"
  
  char igbvf_driver_name[] = "igbvf";
  static const char igbvf_driver_string[] =
  		  "Intel(R) Gigabit Virtual Function Network Driver";
  static const char igbvf_copyright[] =
  		  "Copyright (c) 2009 - 2012 Intel Corporation.";
  
  #define DEFAULT_MSG_ENABLE (NETIF_MSG_DRV|NETIF_MSG_PROBE|NETIF_MSG_LINK)
  static int debug = -1;
  module_param(debug, int, 0);
  MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
  
  static int igbvf_poll(struct napi_struct *napi, int budget);
  static void igbvf_reset(struct igbvf_adapter *);
  static void igbvf_set_interrupt_capability(struct igbvf_adapter *);
  static void igbvf_reset_interrupt_capability(struct igbvf_adapter *);
  
  static struct igbvf_info igbvf_vf_info = {
  	.mac		= e1000_vfadapt,
  	.flags		= 0,
  	.pba		= 10,
  	.init_ops	= e1000_init_function_pointers_vf,
  };
  
  static struct igbvf_info igbvf_i350_vf_info = {
  	.mac		= e1000_vfadapt_i350,
  	.flags		= 0,
  	.pba		= 10,
  	.init_ops	= e1000_init_function_pointers_vf,
  };
  
  static const struct igbvf_info *igbvf_info_tbl[] = {
  	[board_vf]	= &igbvf_vf_info,
  	[board_i350_vf]	= &igbvf_i350_vf_info,
  };
  
  /**
   * igbvf_desc_unused - calculate if we have unused descriptors
   * @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_to_cpu(rx_desc->wb.lower.lo_dword.hs_rss.hdr_info)
  		       & E1000_RXDADV_HDRBUFLEN_MASK) >>
  		       E1000_RXDADV_HDRBUFLEN_SHIFT;
  		if (hlen > adapter->rx_ps_hdr_size)
  			hlen = adapter->rx_ps_hdr_size;
  
  		length = le16_to_cpu(rx_desc->wb.upper.length);
  		cleaned = true;
  		cleaned_count++;
  
  		skb = buffer_info->skb;
  		prefetch(skb->data - NET_IP_ALIGN);
  		buffer_info->skb = NULL;
  		if (!adapter->rx_ps_hdr_size) {
  			dma_unmap_single(&pdev->dev, buffer_info->dma,
  					 adapter->rx_buffer_len,
  					 DMA_FROM_DEVICE);
  			buffer_info->dma = 0;
  			skb_put(skb, length);
  			goto send_up;
  		}
  
  		if (!skb_shinfo(skb)->nr_frags) {
  			dma_unmap_single(&pdev->dev, buffer_info->dma,
  					 adapter->rx_ps_hdr_size,
  					 DMA_FROM_DEVICE);
  			buffer_info->dma = 0;
  			skb_put(skb, hlen);
  		}
  
  		if (length) {
  			dma_unmap_page(&pdev->dev, buffer_info->page_dma,
  				       PAGE_SIZE / 2,
  				       DMA_FROM_DEVICE);
  			buffer_info->page_dma = 0;
  
  			skb_fill_page_desc(skb, skb_shinfo(skb)->nr_frags,
  					   buffer_info->page,
  					   buffer_info->page_offset,
  					   length);
  
  			if ((adapter->rx_buffer_len > (PAGE_SIZE / 2)) ||
  			    (page_count(buffer_info->page) != 1))
  				buffer_info->page = NULL;
  			else
  				get_page(buffer_info->page);
  
  			skb->len += length;
  			skb->data_len += length;
  			skb->truesize += PAGE_SIZE / 2;
  		}
  send_up:
  		i++;
  		if (i == rx_ring->count)
  			i = 0;
  		next_rxd = IGBVF_RX_DESC_ADV(*rx_ring, i);
  		prefetch(next_rxd);
  		next_buffer = &rx_ring->buffer_info[i];
  
  		if (!(staterr & E1000_RXD_STAT_EOP)) {
  			buffer_info->skb = next_buffer->skb;
  			buffer_info->dma = next_buffer->dma;
  			next_buffer->skb = skb;
  			next_buffer->dma = 0;
  			goto next_desc;
  		}
  
  		if (staterr & E1000_RXDEXT_ERR_FRAME_ERR_MASK) {
  			dev_kfree_skb_irq(skb);
  			goto next_desc;
  		}
  
  		total_bytes += skb->len;
  		total_packets++;
  
  		igbvf_rx_checksum_adv(adapter, staterr, skb);
  
  		skb->protocol = eth_type_trans(skb, netdev);
  
  		igbvf_receive_skb(adapter, netdev, skb, staterr,
  				  rx_desc->wb.upper.vlan);
  
  next_desc:
  		rx_desc->wb.upper.status_error = 0;
  
  		/* return some buffers to hardware, one at a time is too slow */
  		if (cleaned_count >= IGBVF_RX_BUFFER_WRITE) {
  			igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
  			cleaned_count = 0;
  		}
  
  		/* use prefetched values */
  		rx_desc = next_rxd;
  		buffer_info = next_buffer;
  
  		staterr = le32_to_cpu(rx_desc->wb.upper.status_error);
  	}
  
  	rx_ring->next_to_clean = i;
  	cleaned_count = igbvf_desc_unused(rx_ring);
  
  	if (cleaned_count)
  		igbvf_alloc_rx_buffers(rx_ring, cleaned_count);
  
  	adapter->total_rx_packets += total_packets;
  	adapter->total_rx_bytes += total_bytes;
  	netdev->stats.rx_bytes += total_bytes;
  	netdev->stats.rx_packets += total_packets;
  	return cleaned;
  }
  
  static void igbvf_put_txbuf(struct igbvf_adapter *adapter,
  			    struct igbvf_buffer *buffer_info)
  {
  	if (buffer_info->dma) {
  		if (buffer_info->mapped_as_page)
  			dma_unmap_page(&adapter->pdev->dev,
  				       buffer_info->dma,
  				       buffer_info->length,
  				       DMA_TO_DEVICE);
  		else
  			dma_unmap_single(&adapter->pdev->dev,
  					 buffer_info->dma,
  					 buffer_info->length,
  					 DMA_TO_DEVICE);
  		buffer_info->dma = 0;
  	}
  	if (buffer_info->skb) {
  		dev_kfree_skb_any(buffer_info->skb);
  		buffer_info->skb = NULL;
  	}
  	buffer_info->time_stamp = 0;
  }
  
  /**
   * igbvf_setup_tx_resources - allocate Tx resources (Descriptors)
   * @adapter: board private structure
   * @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;
  
  	adapter->int_counter1++;
  
  	hw->mac.get_link_status = 1;
  	if (!test_bit(__IGBVF_DOWN, &adapter->state))
  		mod_timer(&adapter->watchdog_timer, jiffies + 1);
  
  	ew32(EIMS, adapter->eims_other);
  
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t igbvf_intr_msix_tx(int irq, void *data)
  {
  	struct net_device *netdev = data;
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct igbvf_ring *tx_ring = adapter->tx_ring;
  
  	if (tx_ring->set_itr) {
  		writel(tx_ring->itr_val,
  		       adapter->hw.hw_addr + tx_ring->itr_register);
  		adapter->tx_ring->set_itr = 0;
  	}
  
  	adapter->total_tx_bytes = 0;
  	adapter->total_tx_packets = 0;
  
  	/* auto mask will automatically re-enable the interrupt when we write
  	 * EICS
  	 */
  	if (!igbvf_clean_tx_irq(tx_ring))
  		/* Ring was not completely cleaned, so fire another interrupt */
  		ew32(EICS, tx_ring->eims_value);
  	else
  		ew32(EIMS, tx_ring->eims_value);
  
  	return IRQ_HANDLED;
  }
  
  static irqreturn_t igbvf_intr_msix_rx(int irq, void *data)
  {
  	struct net_device *netdev = data;
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	adapter->int_counter0++;
  
  	/* Write the ITR value calculated at the end of the
  	 * previous interrupt.
  	 */
  	if (adapter->rx_ring->set_itr) {
  		writel(adapter->rx_ring->itr_val,
  		       adapter->hw.hw_addr + adapter->rx_ring->itr_register);
  		adapter->rx_ring->set_itr = 0;
  	}
  
  	if (napi_schedule_prep(&adapter->rx_ring->napi)) {
  		adapter->total_rx_bytes = 0;
  		adapter->total_rx_packets = 0;
  		__napi_schedule(&adapter->rx_ring->napi);
  	}
  
  	return IRQ_HANDLED;
  }
  
  #define IGBVF_NO_QUEUE -1
  
  static void igbvf_assign_vector(struct igbvf_adapter *adapter, int rx_queue,
  				int tx_queue, int msix_vector)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	u32 ivar, index;
  
  	/* 82576 uses a table-based method for assigning vectors.
  	 * Each queue has a single entry in the table to which we write
  	 * a vector number along with a "valid" bit.  Sadly, the layout
  	 * of the table is somewhat counterintuitive.
  	 */
  	if (rx_queue > IGBVF_NO_QUEUE) {
  		index = (rx_queue >> 1);
  		ivar = array_er32(IVAR0, index);
  		if (rx_queue & 0x1) {
  			/* vector goes into third byte of register */
  			ivar = ivar & 0xFF00FFFF;
  			ivar |= (msix_vector | E1000_IVAR_VALID) << 16;
  		} else {
  			/* vector goes into low byte of register */
  			ivar = ivar & 0xFFFFFF00;
  			ivar |= msix_vector | E1000_IVAR_VALID;
  		}
  		adapter->rx_ring[rx_queue].eims_value = BIT(msix_vector);
  		array_ew32(IVAR0, index, ivar);
  	}
  	if (tx_queue > IGBVF_NO_QUEUE) {
  		index = (tx_queue >> 1);
  		ivar = array_er32(IVAR0, index);
  		if (tx_queue & 0x1) {
  			/* vector goes into high byte of register */
  			ivar = ivar & 0x00FFFFFF;
  			ivar |= (msix_vector | E1000_IVAR_VALID) << 24;
  		} else {
  			/* vector goes into second byte of register */
  			ivar = ivar & 0xFFFF00FF;
  			ivar |= (msix_vector | E1000_IVAR_VALID) << 8;
  		}
  		adapter->tx_ring[tx_queue].eims_value = BIT(msix_vector);
  		array_ew32(IVAR0, index, ivar);
  	}
  }
  
  /**
   * igbvf_configure_msix - Configure MSI-X hardware
   * @adapter: board private structure
   *
   * igbvf_configure_msix sets up the hardware to properly
   * generate MSI-X interrupts.
   **/
  static void igbvf_configure_msix(struct igbvf_adapter *adapter)
  {
  	u32 tmp;
  	struct e1000_hw *hw = &adapter->hw;
  	struct igbvf_ring *tx_ring = adapter->tx_ring;
  	struct igbvf_ring *rx_ring = adapter->rx_ring;
  	int vector = 0;
  
  	adapter->eims_enable_mask = 0;
  
  	igbvf_assign_vector(adapter, IGBVF_NO_QUEUE, 0, vector++);
  	adapter->eims_enable_mask |= tx_ring->eims_value;
  	writel(tx_ring->itr_val, hw->hw_addr + tx_ring->itr_register);
  	igbvf_assign_vector(adapter, 0, IGBVF_NO_QUEUE, vector++);
  	adapter->eims_enable_mask |= rx_ring->eims_value;
  	writel(rx_ring->itr_val, hw->hw_addr + rx_ring->itr_register);
  
  	/* set vector for other causes, i.e. link changes */
  
  	tmp = (vector++ | E1000_IVAR_VALID);
  
  	ew32(IVAR_MISC, tmp);
  
  	adapter->eims_enable_mask = GENMASK(vector - 1, 0);
  	adapter->eims_other = BIT(vector - 1);
  	e1e_flush();
  }
  
  static void igbvf_reset_interrupt_capability(struct igbvf_adapter *adapter)
  {
  	if (adapter->msix_entries) {
  		pci_disable_msix(adapter->pdev);
  		kfree(adapter->msix_entries);
  		adapter->msix_entries = NULL;
  	}
  }
  
  /**
   * igbvf_set_interrupt_capability - set MSI or MSI-X if supported
   * @adapter: board private structure
   *
   * Attempt to configure interrupts using the best available
   * capabilities of the hardware and kernel.
   **/
  static void igbvf_set_interrupt_capability(struct igbvf_adapter *adapter)
  {
  	int err = -ENOMEM;
  	int i;
  
  	/* we allocate 3 vectors, 1 for Tx, 1 for Rx, one for PF messages */
  	adapter->msix_entries = kcalloc(3, sizeof(struct msix_entry),
  					GFP_KERNEL);
  	if (adapter->msix_entries) {
  		for (i = 0; i < 3; i++)
  			adapter->msix_entries[i].entry = i;
  
  		err = pci_enable_msix_range(adapter->pdev,
  					    adapter->msix_entries, 3, 3);
  	}
  
  	if (err < 0) {
  		/* MSI-X failed */
  		dev_err(&adapter->pdev->dev,
  			"Failed to initialize MSI-X interrupts.\n");
  		igbvf_reset_interrupt_capability(adapter);
  	}
  }
  
  /**
   * igbvf_request_msix - Initialize MSI-X interrupts
   * @adapter: board private structure
   *
   * igbvf_request_msix allocates MSI-X vectors and requests interrupts from the
   * kernel.
   **/
  static int igbvf_request_msix(struct igbvf_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int err = 0, vector = 0;
  
  	if (strlen(netdev->name) < (IFNAMSIZ - 5)) {
  		sprintf(adapter->tx_ring->name, "%s-tx-0", netdev->name);
  		sprintf(adapter->rx_ring->name, "%s-rx-0", netdev->name);
  	} else {
  		memcpy(adapter->tx_ring->name, netdev->name, IFNAMSIZ);
  		memcpy(adapter->rx_ring->name, netdev->name, IFNAMSIZ);
  	}
  
  	err = request_irq(adapter->msix_entries[vector].vector,
  			  igbvf_intr_msix_tx, 0, adapter->tx_ring->name,
  			  netdev);
  	if (err)
  		goto out;
  
  	adapter->tx_ring->itr_register = E1000_EITR(vector);
  	adapter->tx_ring->itr_val = adapter->current_itr;
  	vector++;
  
  	err = request_irq(adapter->msix_entries[vector].vector,
  			  igbvf_intr_msix_rx, 0, adapter->rx_ring->name,
  			  netdev);
  	if (err)
  		goto out;
  
  	adapter->rx_ring->itr_register = E1000_EITR(vector);
  	adapter->rx_ring->itr_val = adapter->current_itr;
  	vector++;
  
  	err = request_irq(adapter->msix_entries[vector].vector,
  			  igbvf_msix_other, 0, netdev->name, netdev);
  	if (err)
  		goto out;
  
  	igbvf_configure_msix(adapter);
  	return 0;
  out:
  	return err;
  }
  
  /**
   * igbvf_alloc_queues - Allocate memory for all rings
   * @adapter: board private structure to initialize
   **/
  static int igbvf_alloc_queues(struct igbvf_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  
  	adapter->tx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
  	if (!adapter->tx_ring)
  		return -ENOMEM;
  
  	adapter->rx_ring = kzalloc(sizeof(struct igbvf_ring), GFP_KERNEL);
  	if (!adapter->rx_ring) {
  		kfree(adapter->tx_ring);
  		return -ENOMEM;
  	}
  
  	netif_napi_add(netdev, &adapter->rx_ring->napi, igbvf_poll, 64);
  
  	return 0;
  }
  
  /**
   * igbvf_request_irq - initialize interrupts
   * @adapter: board private structure
   *
   * Attempts to configure interrupts using the best available
   * capabilities of the hardware and kernel.
   **/
  static int igbvf_request_irq(struct igbvf_adapter *adapter)
  {
  	int err = -1;
  
  	/* igbvf supports msi-x only */
  	if (adapter->msix_entries)
  		err = igbvf_request_msix(adapter);
  
  	if (!err)
  		return err;
  
  	dev_err(&adapter->pdev->dev,
  		"Unable to allocate interrupt, Error: %d\n", err);
  
  	return err;
  }
  
  static void igbvf_free_irq(struct igbvf_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	int vector;
  
  	if (adapter->msix_entries) {
  		for (vector = 0; vector < 3; vector++)
  			free_irq(adapter->msix_entries[vector].vector, netdev);
  	}
  }
  
  /**
   * igbvf_irq_disable - Mask off interrupt generation on the NIC
   * @adapter: board private structure
   **/
  static void igbvf_irq_disable(struct igbvf_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	ew32(EIMC, ~0);
  
  	if (adapter->msix_entries)
  		ew32(EIAC, 0);
  }
  
  /**
   * igbvf_irq_enable - Enable default interrupt generation settings
   * @adapter: board private structure
   **/
  static void igbvf_irq_enable(struct igbvf_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	ew32(EIAC, adapter->eims_enable_mask);
  	ew32(EIAM, adapter->eims_enable_mask);
  	ew32(EIMS, adapter->eims_enable_mask);
  }
  
  /**
   * igbvf_poll - NAPI Rx polling callback
   * @napi: struct associated with this polling callback
   * @budget: amount of packets driver is allowed to process this poll
   **/
  static int igbvf_poll(struct napi_struct *napi, int budget)
  {
  	struct igbvf_ring *rx_ring = container_of(napi, struct igbvf_ring, napi);
  	struct igbvf_adapter *adapter = rx_ring->adapter;
  	struct e1000_hw *hw = &adapter->hw;
  	int work_done = 0;
  
  	igbvf_clean_rx_irq(adapter, &work_done, budget);
  
  	if (work_done == budget)
  		return budget;
  
  	/* Exit the polling mode, but don't re-enable interrupts if stack might
  	 * poll us due to busy-polling
  	 */
  	if (likely(napi_complete_done(napi, work_done))) {
  		if (adapter->requested_itr & 3)
  			igbvf_set_itr(adapter);
  
  		if (!test_bit(__IGBVF_DOWN, &adapter->state))
  			ew32(EIMS, adapter->rx_ring->eims_value);
  	}
  
  	return work_done;
  }
  
  /**
   * igbvf_set_rlpml - set receive large packet maximum length
   * @adapter: board private structure
   *
   * Configure the maximum size of packets that will be received
   */
  static void igbvf_set_rlpml(struct igbvf_adapter *adapter)
  {
  	int max_frame_size;
  	struct e1000_hw *hw = &adapter->hw;
  
  	max_frame_size = adapter->max_frame_size + VLAN_TAG_SIZE;
  
  	spin_lock_bh(&hw->mbx_lock);
  
  	e1000_rlpml_set_vf(hw, max_frame_size);
  
  	spin_unlock_bh(&hw->mbx_lock);
  }
  
  static int igbvf_vlan_rx_add_vid(struct net_device *netdev,
  				 __be16 proto, u16 vid)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  
  	spin_lock_bh(&hw->mbx_lock);
  
  	if (hw->mac.ops.set_vfta(hw, vid, true)) {
  		dev_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);
  
  	del_timer_sync(&adapter->watchdog_timer);
  
  	/* record the stats before reset*/
  	igbvf_update_stats(adapter);
  
  	adapter->link_speed = 0;
  	adapter->link_duplex = 0;
  
  	igbvf_reset(adapter);
  	igbvf_clean_tx_ring(adapter->tx_ring);
  	igbvf_clean_rx_ring(adapter->rx_ring);
  }
  
  void igbvf_reinit_locked(struct igbvf_adapter *adapter)
  {
  	might_sleep();
  	while (test_and_set_bit(__IGBVF_RESETTING, &adapter->state))
  		usleep_range(1000, 2000);
  	igbvf_down(adapter);
  	igbvf_up(adapter);
  	clear_bit(__IGBVF_RESETTING, &adapter->state);
  }
  
  /**
   * igbvf_sw_init - Initialize general software structures (struct igbvf_adapter)
   * @adapter: board private structure to initialize
   *
   * igbvf_sw_init initializes the Adapter private data structure.
   * Fields are initialized based on PCI device information and
   * OS network device settings (MTU size).
   **/
  static int igbvf_sw_init(struct igbvf_adapter *adapter)
  {
  	struct net_device *netdev = adapter->netdev;
  	s32 rc;
  
  	adapter->rx_buffer_len = ETH_FRAME_LEN + VLAN_HLEN + ETH_FCS_LEN;
  	adapter->rx_ps_hdr_size = 0;
  	adapter->max_frame_size = netdev->mtu + ETH_HLEN + ETH_FCS_LEN;
  	adapter->min_frame_size = ETH_ZLEN + ETH_FCS_LEN;
  
  	adapter->tx_int_delay = 8;
  	adapter->tx_abs_int_delay = 32;
  	adapter->rx_int_delay = 0;
  	adapter->rx_abs_int_delay = 8;
  	adapter->requested_itr = 3;
  	adapter->current_itr = IGBVF_START_ITR;
  
  	/* Set various function pointers */
  	adapter->ei->init_ops(&adapter->hw);
  
  	rc = adapter->hw.mac.ops.init_params(&adapter->hw);
  	if (rc)
  		return rc;
  
  	rc = adapter->hw.mbx.ops.init_params(&adapter->hw);
  	if (rc)
  		return rc;
  
  	igbvf_set_interrupt_capability(adapter);
  
  	if (igbvf_alloc_queues(adapter))
  		return -ENOMEM;
  
  	spin_lock_init(&adapter->tx_queue_lock);
  
  	/* Explicitly disable IRQ since the NIC can be in any state. */
  	igbvf_irq_disable(adapter);
  
  	spin_lock_init(&adapter->stats_lock);
  	spin_lock_init(&adapter->hw.mbx_lock);
  
  	set_bit(__IGBVF_DOWN, &adapter->state);
  	return 0;
  }
  
  static void igbvf_initialize_last_counter_stats(struct igbvf_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  
  	adapter->stats.last_gprc = er32(VFGPRC);
  	adapter->stats.last_gorc = er32(VFGORC);
  	adapter->stats.last_gptc = er32(VFGPTC);
  	adapter->stats.last_gotc = er32(VFGOTC);
  	adapter->stats.last_mprc = er32(VFMPRC);
  	adapter->stats.last_gotlbc = er32(VFGOTLBC);
  	adapter->stats.last_gptlbc = er32(VFGPTLBC);
  	adapter->stats.last_gorlbc = er32(VFGORLBC);
  	adapter->stats.last_gprlbc = er32(VFGPRLBC);
  
  	adapter->stats.base_gprc = er32(VFGPRC);
  	adapter->stats.base_gorc = er32(VFGORC);
  	adapter->stats.base_gptc = er32(VFGPTC);
  	adapter->stats.base_gotc = er32(VFGOTC);
  	adapter->stats.base_mprc = er32(VFMPRC);
  	adapter->stats.base_gotlbc = er32(VFGOTLBC);
  	adapter->stats.base_gptlbc = er32(VFGPTLBC);
  	adapter->stats.base_gorlbc = er32(VFGORLBC);
  	adapter->stats.base_gprlbc = er32(VFGPRLBC);
  }
  
  /**
   * igbvf_open - Called when a network interface is made active
   * @netdev: network interface device structure
   *
   * Returns 0 on success, negative value on failure
   *
   * The open entry point is called when a network interface is made
   * active by the system (IFF_UP).  At this point all resources needed
   * for transmit and receive operations are allocated, the interrupt
   * handler is registered with the OS, the watchdog timer is started,
   * and the stack is notified that the interface is ready.
   **/
  static int igbvf_open(struct net_device *netdev)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	int err;
  
  	/* disallow open during test */
  	if (test_bit(__IGBVF_TESTING, &adapter->state))
  		return -EBUSY;
  
  	/* allocate transmit descriptors */
  	err = igbvf_setup_tx_resources(adapter, adapter->tx_ring);
  	if (err)
  		goto err_setup_tx;
  
  	/* allocate receive descriptors */
  	err = igbvf_setup_rx_resources(adapter, adapter->rx_ring);
  	if (err)
  		goto err_setup_rx;
  
  	/* before we allocate an interrupt, we must be ready to handle it.
  	 * Setting DEBUG_SHIRQ in the kernel makes it fire an interrupt
  	 * as soon as we call pci_request_irq, so we have to setup our
  	 * clean_rx handler before we do so.
  	 */
  	igbvf_configure(adapter);
  
  	err = igbvf_request_irq(adapter);
  	if (err)
  		goto err_req_irq;
  
  	/* From here on the code is the same as igbvf_up() */
  	clear_bit(__IGBVF_DOWN, &adapter->state);
  
  	napi_enable(&adapter->rx_ring->napi);
  
  	/* clear any pending interrupts */
  	er32(EICR);
  
  	igbvf_irq_enable(adapter);
  
  	/* start the watchdog */
  	hw->mac.get_link_status = 1;
  	mod_timer(&adapter->watchdog_timer, jiffies + 1);
  
  	return 0;
  
  err_req_irq:
  	igbvf_free_rx_resources(adapter->rx_ring);
  err_setup_rx:
  	igbvf_free_tx_resources(adapter->tx_ring);
  err_setup_tx:
  	igbvf_reset(adapter);
  
  	return err;
  }
  
  /**
   * igbvf_close - Disables a network interface
   * @netdev: network interface device structure
   *
   * Returns 0, this is not allowed to fail
   *
   * The close entry point is called when an interface is de-activated
   * by the OS.  The hardware is still under the drivers control, but
   * needs to be disabled.  A global MAC reset is issued to stop the
   * hardware, and all transmit and receive resources are freed.
   **/
  static int igbvf_close(struct net_device *netdev)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
  	igbvf_down(adapter);
  
  	igbvf_free_irq(adapter);
  
  	igbvf_free_tx_resources(adapter->tx_ring);
  	igbvf_free_rx_resources(adapter->rx_ring);
  
  	return 0;
  }
  
  /**
   * igbvf_set_mac - Change the Ethernet Address of the NIC
   * @netdev: network interface device structure
   * @p: pointer to an address structure
   *
   * Returns 0 on success, negative on failure
   **/
  static int igbvf_set_mac(struct net_device *netdev, void *p)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  	struct e1000_hw *hw = &adapter->hw;
  	struct sockaddr *addr = p;
  
  	if (!is_valid_ether_addr(addr->sa_data))
  		return -EADDRNOTAVAIL;
  
  	memcpy(hw->mac.addr, addr->sa_data, netdev->addr_len);
  
  	spin_lock_bh(&hw->mbx_lock);
  
  	hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
  
  	spin_unlock_bh(&hw->mbx_lock);
  
  	if (!ether_addr_equal(addr->sa_data, hw->mac.addr))
  		return -EADDRNOTAVAIL;
  
  	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 = from_timer(adapter, t, watchdog_timer);
  
  	/* Do the rest outside of interrupt context */
  	schedule_work(&adapter->watchdog_task);
  }
  
  static void igbvf_watchdog_task(struct work_struct *work)
  {
  	struct igbvf_adapter *adapter = container_of(work,
  						     struct igbvf_adapter,
  						     watchdog_task);
  	struct net_device *netdev = adapter->netdev;
  	struct e1000_mac_info *mac = &adapter->hw.mac;
  	struct igbvf_ring *tx_ring = adapter->tx_ring;
  	struct e1000_hw *hw = &adapter->hw;
  	u32 link;
  	int tx_pending = 0;
  
  	link = igbvf_has_link(adapter);
  
  	if (link) {
  		if (!netif_carrier_ok(netdev)) {
  			mac->ops.get_link_up_info(&adapter->hw,
  						  &adapter->link_speed,
  						  &adapter->link_duplex);
  			igbvf_print_link_info(adapter);
  
  			netif_carrier_on(netdev);
  			netif_wake_queue(netdev);
  		}
  	} else {
  		if (netif_carrier_ok(netdev)) {
  			adapter->link_speed = 0;
  			adapter->link_duplex = 0;
  			dev_info(&adapter->pdev->dev, "Link is Down\n");
  			netif_carrier_off(netdev);
  			netif_stop_queue(netdev);
  		}
  	}
  
  	if (netif_carrier_ok(netdev)) {
  		igbvf_update_stats(adapter);
  	} else {
  		tx_pending = (igbvf_desc_unused(tx_ring) + 1 <
  			      tx_ring->count);
  		if (tx_pending) {
  			/* We've lost link, so the controller stops DMA,
  			 * but we've got queued Tx work that's never going
  			 * to get done, so reset controller to flush Tx.
  			 * (Do the reset outside of interrupt context).
  			 */
  			adapter->tx_timeout_count++;
  			schedule_work(&adapter->reset_task);
  		}
  	}
  
  	/* Cause software interrupt to ensure Rx ring is cleaned */
  	ew32(EICS, adapter->rx_ring->eims_value);
  
  	/* Reset the timer */
  	if (!test_bit(__IGBVF_DOWN, &adapter->state))
  		mod_timer(&adapter->watchdog_timer,
  			  round_jiffies(jiffies + (2 * HZ)));
  }
  
  #define IGBVF_TX_FLAGS_CSUM		0x00000001
  #define IGBVF_TX_FLAGS_VLAN		0x00000002
  #define IGBVF_TX_FLAGS_TSO		0x00000004
  #define IGBVF_TX_FLAGS_IPV4		0x00000008
  #define IGBVF_TX_FLAGS_VLAN_MASK	0xffff0000
  #define IGBVF_TX_FLAGS_VLAN_SHIFT	16
  
  static void igbvf_tx_ctxtdesc(struct igbvf_ring *tx_ring, u32 vlan_macip_lens,
  			      u32 type_tucmd, u32 mss_l4len_idx)
  {
  	struct e1000_adv_tx_context_desc *context_desc;
  	struct igbvf_buffer *buffer_info;
  	u16 i = tx_ring->next_to_use;
  
  	context_desc = IGBVF_TX_CTXTDESC_ADV(*tx_ring, i);
  	buffer_info = &tx_ring->buffer_info[i];
  
  	i++;
  	tx_ring->next_to_use = (i < tx_ring->count) ? i : 0;
  
  	/* set bits to identify this as an advanced context descriptor */
  	type_tucmd |= E1000_TXD_CMD_DEXT | E1000_ADVTXD_DTYP_CTXT;
  
  	context_desc->vlan_macip_lens	= cpu_to_le32(vlan_macip_lens);
  	context_desc->seqnum_seed	= 0;
  	context_desc->type_tucmd_mlhl	= cpu_to_le32(type_tucmd);
  	context_desc->mss_l4len_idx	= cpu_to_le32(mss_l4len_idx);
  
  	buffer_info->time_stamp = jiffies;
  	buffer_info->dma = 0;
  }
  
  static int igbvf_tso(struct igbvf_ring *tx_ring,
  		     struct sk_buff *skb, u32 tx_flags, u8 *hdr_len)
  {
  	u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
  	union {
  		struct iphdr *v4;
  		struct ipv6hdr *v6;
  		unsigned char *hdr;
  	} ip;
  	union {
  		struct tcphdr *tcp;
  		unsigned char *hdr;
  	} l4;
  	u32 paylen, l4_offset;
  	int err;
  
  	if (skb->ip_summed != CHECKSUM_PARTIAL)
  		return 0;
  
  	if (!skb_is_gso(skb))
  		return 0;
  
  	err = skb_cow_head(skb, 0);
  	if (err < 0)
  		return err;
  
  	ip.hdr = skb_network_header(skb);
  	l4.hdr = skb_checksum_start(skb);
  
  	/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
  	type_tucmd = E1000_ADVTXD_TUCMD_L4T_TCP;
  
  	/* initialize outer IP header fields */
  	if (ip.v4->version == 4) {
  		unsigned char *csum_start = skb_checksum_start(skb);
  		unsigned char *trans_start = ip.hdr + (ip.v4->ihl * 4);
  
  		/* IP header will have to cancel out any data that
  		 * is not a part of the outer IP header
  		 */
  		ip.v4->check = csum_fold(csum_partial(trans_start,
  						      csum_start - trans_start,
  						      0));
  		type_tucmd |= E1000_ADVTXD_TUCMD_IPV4;
  
  		ip.v4->tot_len = 0;
  	} else {
  		ip.v6->payload_len = 0;
  	}
  
  	/* determine offset of inner transport header */
  	l4_offset = l4.hdr - skb->data;
  
  	/* compute length of segmentation header */
  	*hdr_len = (l4.tcp->doff * 4) + l4_offset;
  
  	/* remove payload length from inner checksum */
  	paylen = skb->len - l4_offset;
  	csum_replace_by_diff(&l4.tcp->check, (__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);
  	netdev->mtu = new_mtu;
  
  	if (netif_running(netdev))
  		igbvf_up(adapter);
  	else
  		igbvf_reset(adapter);
  
  	clear_bit(__IGBVF_RESETTING, &adapter->state);
  
  	return 0;
  }
  
  static int igbvf_ioctl(struct net_device *netdev, struct ifreq *ifr, int cmd)
  {
  	switch (cmd) {
  	default:
  		return -EOPNOTSUPP;
  	}
  }
  
  static int igbvf_suspend(struct device *dev_d)
  {
  	struct net_device *netdev = dev_get_drvdata(dev_d);
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	netif_device_detach(netdev);
  
  	if (netif_running(netdev)) {
  		WARN_ON(test_bit(__IGBVF_RESETTING, &adapter->state));
  		igbvf_down(adapter);
  		igbvf_free_irq(adapter);
  	}
  
  	return 0;
  }
  
  static int __maybe_unused igbvf_resume(struct device *dev_d)
  {
  	struct pci_dev *pdev = to_pci_dev(dev_d);
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  	u32 err;
  
  	pci_set_master(pdev);
  
  	if (netif_running(netdev)) {
  		err = igbvf_request_irq(adapter);
  		if (err)
  			return err;
  	}
  
  	igbvf_reset(adapter);
  
  	if (netif_running(netdev))
  		igbvf_up(adapter);
  
  	netif_device_attach(netdev);
  
  	return 0;
  }
  
  static void igbvf_shutdown(struct pci_dev *pdev)
  {
  	igbvf_suspend(&pdev->dev);
  }
  
  #ifdef CONFIG_NET_POLL_CONTROLLER
  /* Polling 'interrupt' - used by things like netconsole to send skbs
   * without having to re-enable interrupts. It's not called while
   * the interrupt routine is executing.
   */
  static void igbvf_netpoll(struct net_device *netdev)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	disable_irq(adapter->pdev->irq);
  
  	igbvf_clean_tx_irq(adapter->tx_ring);
  
  	enable_irq(adapter->pdev->irq);
  }
  #endif
  
  /**
   * igbvf_io_error_detected - called when PCI error is detected
   * @pdev: Pointer to PCI device
   * @state: The current pci connection state
   *
   * This function is called after a PCI bus error affecting
   * this device has been detected.
   */
  static pci_ers_result_t igbvf_io_error_detected(struct pci_dev *pdev,
  						pci_channel_state_t state)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	netif_device_detach(netdev);
  
  	if (state == pci_channel_io_perm_failure)
  		return PCI_ERS_RESULT_DISCONNECT;
  
  	if (netif_running(netdev))
  		igbvf_down(adapter);
  	pci_disable_device(pdev);
  
  	/* Request a slot slot reset. */
  	return PCI_ERS_RESULT_NEED_RESET;
  }
  
  /**
   * igbvf_io_slot_reset - called after the pci bus has been reset.
   * @pdev: Pointer to PCI device
   *
   * Restart the card from scratch, as if from a cold-boot. Implementation
   * resembles the first-half of the igbvf_resume routine.
   */
  static pci_ers_result_t igbvf_io_slot_reset(struct pci_dev *pdev)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	if (pci_enable_device_mem(pdev)) {
  		dev_err(&pdev->dev,
  			"Cannot re-enable PCI device after reset.\n");
  		return PCI_ERS_RESULT_DISCONNECT;
  	}
  	pci_set_master(pdev);
  
  	igbvf_reset(adapter);
  
  	return PCI_ERS_RESULT_RECOVERED;
  }
  
  /**
   * igbvf_io_resume - called when traffic can start flowing again.
   * @pdev: Pointer to PCI device
   *
   * This callback is called when the error recovery driver tells us that
   * its OK to resume normal operation. Implementation resembles the
   * second-half of the igbvf_resume routine.
   */
  static void igbvf_io_resume(struct pci_dev *pdev)
  {
  	struct net_device *netdev = pci_get_drvdata(pdev);
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	if (netif_running(netdev)) {
  		if (igbvf_up(adapter)) {
  			dev_err(&pdev->dev,
  				"can't bring device back up after reset\n");
  			return;
  		}
  	}
  
  	netif_device_attach(netdev);
  }
  
  static void igbvf_print_device_info(struct igbvf_adapter *adapter)
  {
  	struct e1000_hw *hw = &adapter->hw;
  	struct net_device *netdev = adapter->netdev;
  	struct pci_dev *pdev = adapter->pdev;
  
  	if (hw->mac.type == e1000_vfadapt_i350)
  		dev_info(&pdev->dev, "Intel(R) I350 Virtual Function\n");
  	else
  		dev_info(&pdev->dev, "Intel(R) 82576 Virtual Function\n");
  	dev_info(&pdev->dev, "Address: %pM\n", netdev->dev_addr);
  }
  
  static int igbvf_set_features(struct net_device *netdev,
  			      netdev_features_t features)
  {
  	struct igbvf_adapter *adapter = netdev_priv(netdev);
  
  	if (features & NETIF_F_RXCSUM)
  		adapter->flags &= ~IGBVF_FLAG_RX_CSUM_DISABLED;
  	else
  		adapter->flags |= IGBVF_FLAG_RX_CSUM_DISABLED;
  
  	return 0;
  }
  
  #define IGBVF_MAX_MAC_HDR_LEN		127
  #define IGBVF_MAX_NETWORK_HDR_LEN	511
  
  static netdev_features_t
  igbvf_features_check(struct sk_buff *skb, struct net_device *dev,
  		     netdev_features_t features)
  {
  	unsigned int network_hdr_len, mac_hdr_len;
  
  	/* Make certain the headers can be described by a context descriptor */
  	mac_hdr_len = skb_network_header(skb) - skb->data;
  	if (unlikely(mac_hdr_len > IGBVF_MAX_MAC_HDR_LEN))
  		return features & ~(NETIF_F_HW_CSUM |
  				    NETIF_F_SCTP_CRC |
  				    NETIF_F_HW_VLAN_CTAG_TX |
  				    NETIF_F_TSO |
  				    NETIF_F_TSO6);
  
  	network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
  	if (unlikely(network_hdr_len >  IGBVF_MAX_NETWORK_HDR_LEN))
  		return features & ~(NETIF_F_HW_CSUM |
  				    NETIF_F_SCTP_CRC |
  				    NETIF_F_TSO |
  				    NETIF_F_TSO6);
  
  	/* We can only support IPV4 TSO in tunnels if we can mangle the
  	 * inner IP ID field, so strip TSO if MANGLEID is not supported.
  	 */
  	if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
  		features &= ~NETIF_F_TSO;
  
  	return features;
  }
  
  static const struct net_device_ops igbvf_netdev_ops = {
  	.ndo_open		= igbvf_open,
  	.ndo_stop		= igbvf_close,
  	.ndo_start_xmit		= igbvf_xmit_frame,
  	.ndo_set_rx_mode	= igbvf_set_rx_mode,
  	.ndo_set_mac_address	= igbvf_set_mac,
  	.ndo_change_mtu		= igbvf_change_mtu,
  	.ndo_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, pci_using_dac;
  
  	err = pci_enable_device_mem(pdev);
  	if (err)
  		return err;
  
  	pci_using_dac = 0;
  	err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
  	if (!err) {
  		pci_using_dac = 1;
  	} else {
  		err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
  		if (err) {
  			dev_err(&pdev->dev,
  				"No usable DMA configuration, aborting\n");
  			goto err_dma;
  		}
  	}
  
  	err = pci_request_regions(pdev, igbvf_driver_name);
  	if (err)
  		goto err_pci_reg;
  
  	pci_set_master(pdev);
  
  	err = -ENOMEM;
  	netdev = alloc_etherdev(sizeof(struct igbvf_adapter));
  	if (!netdev)
  		goto err_alloc_etherdev;
  
  	SET_NETDEV_DEV(netdev, &pdev->dev);
  
  	pci_set_drvdata(pdev, netdev);
  	adapter = netdev_priv(netdev);
  	hw = &adapter->hw;
  	adapter->netdev = netdev;
  	adapter->pdev = pdev;
  	adapter->ei = ei;
  	adapter->pba = ei->pba;
  	adapter->flags = ei->flags;
  	adapter->hw.back = adapter;
  	adapter->hw.mac.type = ei->mac;
  	adapter->msg_enable = netif_msg_init(debug, DEFAULT_MSG_ENABLE);
  
  	/* PCI config space info */
  
  	hw->vendor_id = pdev->vendor;
  	hw->device_id = pdev->device;
  	hw->subsystem_vendor_id = pdev->subsystem_vendor;
  	hw->subsystem_device_id = pdev->subsystem_device;
  	hw->revision_id = pdev->revision;
  
  	err = -EIO;
  	adapter->hw.hw_addr = ioremap(pci_resource_start(pdev, 0),
  				      pci_resource_len(pdev, 0));
  
  	if (!adapter->hw.hw_addr)
  		goto err_ioremap;
  
  	if (ei->get_variants) {
  		err = ei->get_variants(adapter);
  		if (err)
  			goto err_get_variants;
  	}
  
  	/* setup adapter struct */
  	err = igbvf_sw_init(adapter);
  	if (err)
  		goto err_sw_init;
  
  	/* construct the net_device struct */
  	netdev->netdev_ops = &igbvf_netdev_ops;
  
  	igbvf_set_ethtool_ops(netdev);
  	netdev->watchdog_timeo = 5 * HZ;
  	strncpy(netdev->name, pci_name(pdev), sizeof(netdev->name) - 1);
  
  	adapter->bd_number = cards_found++;
  
  	netdev->hw_features = NETIF_F_SG |
  			      NETIF_F_TSO |
  			      NETIF_F_TSO6 |
  			      NETIF_F_RXCSUM |
  			      NETIF_F_HW_CSUM |
  			      NETIF_F_SCTP_CRC;
  
  #define IGBVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
  				    NETIF_F_GSO_GRE_CSUM | \
  				    NETIF_F_GSO_IPXIP4 | \
  				    NETIF_F_GSO_IPXIP6 | \
  				    NETIF_F_GSO_UDP_TUNNEL | \
  				    NETIF_F_GSO_UDP_TUNNEL_CSUM)
  
  	netdev->gso_partial_features = IGBVF_GSO_PARTIAL_FEATURES;
  	netdev->hw_features |= NETIF_F_GSO_PARTIAL |
  			       IGBVF_GSO_PARTIAL_FEATURES;
  
  	netdev->features = netdev->hw_features;
  
  	if (pci_using_dac)
  		netdev->features |= NETIF_F_HIGHDMA;
  
  	netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
  	netdev->mpls_features |= NETIF_F_HW_CSUM;
  	netdev->hw_enc_features |= netdev->vlan_features;
  
  	/* set this bit last since it cannot be part of vlan_features */
  	netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
  			    NETIF_F_HW_VLAN_CTAG_RX |
  			    NETIF_F_HW_VLAN_CTAG_TX;
  
  	/* MTU range: 68 - 9216 */
  	netdev->min_mtu = ETH_MIN_MTU;
  	netdev->max_mtu = MAX_STD_JUMBO_FRAME_SIZE;
  
  	spin_lock_bh(&hw->mbx_lock);
  
  	/*reset the controller to put the device in a known good state */
  	err = hw->mac.ops.reset_hw(hw);
  	if (err) {
  		dev_info(&pdev->dev,
  			 "PF still in reset state. Is the PF interface up?\n");
  	} else {
  		err = hw->mac.ops.read_mac_addr(hw);
  		if (err)
  			dev_info(&pdev->dev, "Error reading MAC address.\n");
  		else if (is_zero_ether_addr(adapter->hw.mac.addr))
  			dev_info(&pdev->dev,
  				 "MAC address not assigned by administrator.\n");
  		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);
  	del_timer_sync(&adapter->watchdog_timer);
  
  	cancel_work_sync(&adapter->reset_task);
  	cancel_work_sync(&adapter->watchdog_task);
  
  	unregister_netdev(netdev);
  
  	igbvf_reset_interrupt_capability(adapter);
  
  	/* it is important to delete the NAPI struct prior to freeing the
  	 * Rx ring so that you do not end up with null pointer refs
  	 */
  	netif_napi_del(&adapter->rx_ring->napi);
  	kfree(adapter->tx_ring);
  	kfree(adapter->rx_ring);
  
  	iounmap(hw->hw_addr);
  	if (hw->flash_address)
  		iounmap(hw->flash_address);
  	pci_release_regions(pdev);
  
  	free_netdev(netdev);
  
  	pci_disable_device(pdev);
  }
  
  /* PCI Error Recovery (ERS) */
  static const struct pci_error_handlers igbvf_err_handler = {
  	.error_detected = igbvf_io_error_detected,
  	.slot_reset = igbvf_io_slot_reset,
  	.resume = igbvf_io_resume,
  };
  
  static const struct pci_device_id igbvf_pci_tbl[] = {
  	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_82576_VF), board_vf },
  	{ PCI_VDEVICE(INTEL, E1000_DEV_ID_I350_VF), board_i350_vf },
  	{ } /* terminate list */
  };
  MODULE_DEVICE_TABLE(pci, igbvf_pci_tbl);
  
  static SIMPLE_DEV_PM_OPS(igbvf_pm_ops, igbvf_suspend, igbvf_resume);
  
  /* PCI Device API Driver */
  static struct pci_driver igbvf_driver = {
  	.name		= igbvf_driver_name,
  	.id_table	= igbvf_pci_tbl,
  	.probe		= igbvf_probe,
  	.remove		= igbvf_remove,
  	.driver.pm	= &igbvf_pm_ops,
  	.shutdown	= igbvf_shutdown,
  	.err_handler	= &igbvf_err_handler
  };
  
  /**
   * igbvf_init_module - Driver Registration Routine
   *
   * igbvf_init_module is the first routine called when the driver is
   * loaded. All it does is register with the PCI subsystem.
   **/
  static int __init igbvf_init_module(void)
  {
  	int ret;
  
  	pr_info("%s\n", igbvf_driver_string);
  	pr_info("%s\n", igbvf_copyright);
  
  	ret = pci_register_driver(&igbvf_driver);
  
  	return ret;
  }
  module_init(igbvf_init_module);
  
  /**
   * igbvf_exit_module - Driver Exit Cleanup Routine
   *
   * igbvf_exit_module is called just before the driver is removed
   * from memory.
   **/
  static void __exit igbvf_exit_module(void)
  {
  	pci_unregister_driver(&igbvf_driver);
  }
  module_exit(igbvf_exit_module);
  
  MODULE_AUTHOR("Intel Corporation, <e1000-devel@lists.sourceforge.net>");
  MODULE_DESCRIPTION("Intel(R) Gigabit Virtual Function Network Driver");
  MODULE_LICENSE("GPL v2");
  
  /* netdev.c */
  