OSCL-LXR linux-6.0.1/​drivers/​net/​ethernet/​intel/​igbvf/​netdev.c	Source navigation Diff markup Identifier search General search
	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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 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;
 
     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;
     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 | 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 */