Adding upstream version 6.1.76.upstream/6.1.76upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2823 insertions, 0 deletions

diff --git a/drivers/net/hyperv/netvsc_drv.c b/drivers/net/hyperv/netvsc_drv.c
new file mode 100644
index 000000000..c1aac6ceb
--- /dev/null
+++ b/drivers/net/hyperv/netvsc_drv.c
@@ -0,0 +1,2823 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2009, Microsoft Corporation.
+ *
+ * Authors:
+ *   Haiyang Zhang <haiyangz@microsoft.com>
+ *   Hank Janssen  <hjanssen@microsoft.com>
+ */
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/init.h>
+#include <linux/atomic.h>
+#include <linux/ethtool.h>
+#include <linux/module.h>
+#include <linux/highmem.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/netdevice.h>
+#include <linux/inetdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/pci.h>
+#include <linux/skbuff.h>
+#include <linux/if_vlan.h>
+#include <linux/in.h>
+#include <linux/slab.h>
+#include <linux/rtnetlink.h>
+#include <linux/netpoll.h>
+#include <linux/bpf.h>
+
+#include <net/arp.h>
+#include <net/route.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <net/checksum.h>
+#include <net/ip6_checksum.h>
+
+#include "hyperv_net.h"
+
+#define RING_SIZE_MIN	64
+
+#define LINKCHANGE_INT (2 * HZ)
+#define VF_TAKEOVER_INT (HZ / 10)
+
+static unsigned int ring_size __ro_after_init = 128;
+module_param(ring_size, uint, 0444);
+MODULE_PARM_DESC(ring_size, "Ring buffer size (# of 4K pages)");
+unsigned int netvsc_ring_bytes __ro_after_init;
+
+static const u32 default_msg = NETIF_MSG_DRV | NETIF_MSG_PROBE |
+				NETIF_MSG_LINK | NETIF_MSG_IFUP |
+				NETIF_MSG_IFDOWN | NETIF_MSG_RX_ERR |
+				NETIF_MSG_TX_ERR;
+
+static int debug = -1;
+module_param(debug, int, 0444);
+MODULE_PARM_DESC(debug, "Debug level (0=none,...,16=all)");
+
+static LIST_HEAD(netvsc_dev_list);
+
+static void netvsc_change_rx_flags(struct net_device *net, int change)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+	int inc;
+
+	if (!vf_netdev)
+		return;
+
+	if (change & IFF_PROMISC) {
+		inc = (net->flags & IFF_PROMISC) ? 1 : -1;
+		dev_set_promiscuity(vf_netdev, inc);
+	}
+
+	if (change & IFF_ALLMULTI) {
+		inc = (net->flags & IFF_ALLMULTI) ? 1 : -1;
+		dev_set_allmulti(vf_netdev, inc);
+	}
+}
+
+static void netvsc_set_rx_mode(struct net_device *net)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct net_device *vf_netdev;
+	struct netvsc_device *nvdev;
+
+	rcu_read_lock();
+	vf_netdev = rcu_dereference(ndev_ctx->vf_netdev);
+	if (vf_netdev) {
+		dev_uc_sync(vf_netdev, net);
+		dev_mc_sync(vf_netdev, net);
+	}
+
+	nvdev = rcu_dereference(ndev_ctx->nvdev);
+	if (nvdev)
+		rndis_filter_update(nvdev);
+	rcu_read_unlock();
+}
+
+static void netvsc_tx_enable(struct netvsc_device *nvscdev,
+			     struct net_device *ndev)
+{
+	nvscdev->tx_disable = false;
+	virt_wmb(); /* ensure queue wake up mechanism is on */
+
+	netif_tx_wake_all_queues(ndev);
+}
+
+static int netvsc_open(struct net_device *net)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct net_device *vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndev_ctx->nvdev);
+	struct rndis_device *rdev;
+	int ret = 0;
+
+	netif_carrier_off(net);
+
+	/* Open up the device */
+	ret = rndis_filter_open(nvdev);
+	if (ret != 0) {
+		netdev_err(net, "unable to open device (ret %d).\n", ret);
+		return ret;
+	}
+
+	rdev = nvdev->extension;
+	if (!rdev->link_state) {
+		netif_carrier_on(net);
+		netvsc_tx_enable(nvdev, net);
+	}
+
+	if (vf_netdev) {
+		/* Setting synthetic device up transparently sets
+		 * slave as up. If open fails, then slave will be
+		 * still be offline (and not used).
+		 */
+		ret = dev_open(vf_netdev, NULL);
+		if (ret)
+			netdev_warn(net,
+				    "unable to open slave: %s: %d\n",
+				    vf_netdev->name, ret);
+	}
+	return 0;
+}
+
+static int netvsc_wait_until_empty(struct netvsc_device *nvdev)
+{
+	unsigned int retry = 0;
+	int i;
+
+	/* Ensure pending bytes in ring are read */
+	for (;;) {
+		u32 aread = 0;
+
+		for (i = 0; i < nvdev->num_chn; i++) {
+			struct vmbus_channel *chn
+				= nvdev->chan_table[i].channel;
+
+			if (!chn)
+				continue;
+
+			/* make sure receive not running now */
+			napi_synchronize(&nvdev->chan_table[i].napi);
+
+			aread = hv_get_bytes_to_read(&chn->inbound);
+			if (aread)
+				break;
+
+			aread = hv_get_bytes_to_read(&chn->outbound);
+			if (aread)
+				break;
+		}
+
+		if (aread == 0)
+			return 0;
+
+		if (++retry > RETRY_MAX)
+			return -ETIMEDOUT;
+
+		usleep_range(RETRY_US_LO, RETRY_US_HI);
+	}
+}
+
+static void netvsc_tx_disable(struct netvsc_device *nvscdev,
+			      struct net_device *ndev)
+{
+	if (nvscdev) {
+		nvscdev->tx_disable = true;
+		virt_wmb(); /* ensure txq will not wake up after stop */
+	}
+
+	netif_tx_disable(ndev);
+}
+
+static int netvsc_close(struct net_device *net)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct net_device *vf_netdev
+		= rtnl_dereference(net_device_ctx->vf_netdev);
+	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
+	int ret;
+
+	netvsc_tx_disable(nvdev, net);
+
+	/* No need to close rndis filter if it is removed already */
+	if (!nvdev)
+		return 0;
+
+	ret = rndis_filter_close(nvdev);
+	if (ret != 0) {
+		netdev_err(net, "unable to close device (ret %d).\n", ret);
+		return ret;
+	}
+
+	ret = netvsc_wait_until_empty(nvdev);
+	if (ret)
+		netdev_err(net, "Ring buffer not empty after closing rndis\n");
+
+	if (vf_netdev)
+		dev_close(vf_netdev);
+
+	return ret;
+}
+
+static inline void *init_ppi_data(struct rndis_message *msg,
+				  u32 ppi_size, u32 pkt_type)
+{
+	struct rndis_packet *rndis_pkt = &msg->msg.pkt;
+	struct rndis_per_packet_info *ppi;
+
+	rndis_pkt->data_offset += ppi_size;
+	ppi = (void *)rndis_pkt + rndis_pkt->per_pkt_info_offset
+		+ rndis_pkt->per_pkt_info_len;
+
+	ppi->size = ppi_size;
+	ppi->type = pkt_type;
+	ppi->internal = 0;
+	ppi->ppi_offset = sizeof(struct rndis_per_packet_info);
+
+	rndis_pkt->per_pkt_info_len += ppi_size;
+
+	return ppi + 1;
+}
+
+static inline int netvsc_get_tx_queue(struct net_device *ndev,
+				      struct sk_buff *skb, int old_idx)
+{
+	const struct net_device_context *ndc = netdev_priv(ndev);
+	struct sock *sk = skb->sk;
+	int q_idx;
+
+	q_idx = ndc->tx_table[netvsc_get_hash(skb, ndc) &
+			      (VRSS_SEND_TAB_SIZE - 1)];
+
+	/* If queue index changed record the new value */
+	if (q_idx != old_idx &&
+	    sk && sk_fullsock(sk) && rcu_access_pointer(sk->sk_dst_cache))
+		sk_tx_queue_set(sk, q_idx);
+
+	return q_idx;
+}
+
+/*
+ * Select queue for transmit.
+ *
+ * If a valid queue has already been assigned, then use that.
+ * Otherwise compute tx queue based on hash and the send table.
+ *
+ * This is basically similar to default (netdev_pick_tx) with the added step
+ * of using the host send_table when no other queue has been assigned.
+ *
+ * TODO support XPS - but get_xps_queue not exported
+ */
+static u16 netvsc_pick_tx(struct net_device *ndev, struct sk_buff *skb)
+{
+	int q_idx = sk_tx_queue_get(skb->sk);
+
+	if (q_idx < 0 || skb->ooo_okay || q_idx >= ndev->real_num_tx_queues) {
+		/* If forwarding a packet, we use the recorded queue when
+		 * available for better cache locality.
+		 */
+		if (skb_rx_queue_recorded(skb))
+			q_idx = skb_get_rx_queue(skb);
+		else
+			q_idx = netvsc_get_tx_queue(ndev, skb, q_idx);
+	}
+
+	return q_idx;
+}
+
+static u16 netvsc_select_queue(struct net_device *ndev, struct sk_buff *skb,
+			       struct net_device *sb_dev)
+{
+	struct net_device_context *ndc = netdev_priv(ndev);
+	struct net_device *vf_netdev;
+	u16 txq;
+
+	rcu_read_lock();
+	vf_netdev = rcu_dereference(ndc->vf_netdev);
+	if (vf_netdev) {
+		const struct net_device_ops *vf_ops = vf_netdev->netdev_ops;
+
+		if (vf_ops->ndo_select_queue)
+			txq = vf_ops->ndo_select_queue(vf_netdev, skb, sb_dev);
+		else
+			txq = netdev_pick_tx(vf_netdev, skb, NULL);
+
+		/* Record the queue selected by VF so that it can be
+		 * used for common case where VF has more queues than
+		 * the synthetic device.
+		 */
+		qdisc_skb_cb(skb)->slave_dev_queue_mapping = txq;
+	} else {
+		txq = netvsc_pick_tx(ndev, skb);
+	}
+	rcu_read_unlock();
+
+	while (txq >= ndev->real_num_tx_queues)
+		txq -= ndev->real_num_tx_queues;
+
+	return txq;
+}
+
+static u32 fill_pg_buf(unsigned long hvpfn, u32 offset, u32 len,
+		       struct hv_page_buffer *pb)
+{
+	int j = 0;
+
+	hvpfn += offset >> HV_HYP_PAGE_SHIFT;
+	offset = offset & ~HV_HYP_PAGE_MASK;
+
+	while (len > 0) {
+		unsigned long bytes;
+
+		bytes = HV_HYP_PAGE_SIZE - offset;
+		if (bytes > len)
+			bytes = len;
+		pb[j].pfn = hvpfn;
+		pb[j].offset = offset;
+		pb[j].len = bytes;
+
+		offset += bytes;
+		len -= bytes;
+
+		if (offset == HV_HYP_PAGE_SIZE && len) {
+			hvpfn++;
+			offset = 0;
+			j++;
+		}
+	}
+
+	return j + 1;
+}
+
+static u32 init_page_array(void *hdr, u32 len, struct sk_buff *skb,
+			   struct hv_netvsc_packet *packet,
+			   struct hv_page_buffer *pb)
+{
+	u32 slots_used = 0;
+	char *data = skb->data;
+	int frags = skb_shinfo(skb)->nr_frags;
+	int i;
+
+	/* The packet is laid out thus:
+	 * 1. hdr: RNDIS header and PPI
+	 * 2. skb linear data
+	 * 3. skb fragment data
+	 */
+	slots_used += fill_pg_buf(virt_to_hvpfn(hdr),
+				  offset_in_hvpage(hdr),
+				  len,
+				  &pb[slots_used]);
+
+	packet->rmsg_size = len;
+	packet->rmsg_pgcnt = slots_used;
+
+	slots_used += fill_pg_buf(virt_to_hvpfn(data),
+				  offset_in_hvpage(data),
+				  skb_headlen(skb),
+				  &pb[slots_used]);
+
+	for (i = 0; i < frags; i++) {
+		skb_frag_t *frag = skb_shinfo(skb)->frags + i;
+
+		slots_used += fill_pg_buf(page_to_hvpfn(skb_frag_page(frag)),
+					  skb_frag_off(frag),
+					  skb_frag_size(frag),
+					  &pb[slots_used]);
+	}
+	return slots_used;
+}
+
+static int count_skb_frag_slots(struct sk_buff *skb)
+{
+	int i, frags = skb_shinfo(skb)->nr_frags;
+	int pages = 0;
+
+	for (i = 0; i < frags; i++) {
+		skb_frag_t *frag = skb_shinfo(skb)->frags + i;
+		unsigned long size = skb_frag_size(frag);
+		unsigned long offset = skb_frag_off(frag);
+
+		/* Skip unused frames from start of page */
+		offset &= ~HV_HYP_PAGE_MASK;
+		pages += HVPFN_UP(offset + size);
+	}
+	return pages;
+}
+
+static int netvsc_get_slots(struct sk_buff *skb)
+{
+	char *data = skb->data;
+	unsigned int offset = offset_in_hvpage(data);
+	unsigned int len = skb_headlen(skb);
+	int slots;
+	int frag_slots;
+
+	slots = DIV_ROUND_UP(offset + len, HV_HYP_PAGE_SIZE);
+	frag_slots = count_skb_frag_slots(skb);
+	return slots + frag_slots;
+}
+
+static u32 net_checksum_info(struct sk_buff *skb)
+{
+	if (skb->protocol == htons(ETH_P_IP)) {
+		struct iphdr *ip = ip_hdr(skb);
+
+		if (ip->protocol == IPPROTO_TCP)
+			return TRANSPORT_INFO_IPV4_TCP;
+		else if (ip->protocol == IPPROTO_UDP)
+			return TRANSPORT_INFO_IPV4_UDP;
+	} else {
+		struct ipv6hdr *ip6 = ipv6_hdr(skb);
+
+		if (ip6->nexthdr == IPPROTO_TCP)
+			return TRANSPORT_INFO_IPV6_TCP;
+		else if (ip6->nexthdr == IPPROTO_UDP)
+			return TRANSPORT_INFO_IPV6_UDP;
+	}
+
+	return TRANSPORT_INFO_NOT_IP;
+}
+
+/* Send skb on the slave VF device. */
+static int netvsc_vf_xmit(struct net_device *net, struct net_device *vf_netdev,
+			  struct sk_buff *skb)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	unsigned int len = skb->len;
+	int rc;
+
+	skb->dev = vf_netdev;
+	skb_record_rx_queue(skb, qdisc_skb_cb(skb)->slave_dev_queue_mapping);
+
+	rc = dev_queue_xmit(skb);
+	if (likely(rc == NET_XMIT_SUCCESS || rc == NET_XMIT_CN)) {
+		struct netvsc_vf_pcpu_stats *pcpu_stats
+			= this_cpu_ptr(ndev_ctx->vf_stats);
+
+		u64_stats_update_begin(&pcpu_stats->syncp);
+		pcpu_stats->tx_packets++;
+		pcpu_stats->tx_bytes += len;
+		u64_stats_update_end(&pcpu_stats->syncp);
+	} else {
+		this_cpu_inc(ndev_ctx->vf_stats->tx_dropped);
+	}
+
+	return rc;
+}
+
+static int netvsc_xmit(struct sk_buff *skb, struct net_device *net, bool xdp_tx)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct hv_netvsc_packet *packet = NULL;
+	int ret;
+	unsigned int num_data_pgs;
+	struct rndis_message *rndis_msg;
+	struct net_device *vf_netdev;
+	u32 rndis_msg_size;
+	u32 hash;
+	struct hv_page_buffer pb[MAX_PAGE_BUFFER_COUNT];
+
+	/* If VF is present and up then redirect packets to it.
+	 * Skip the VF if it is marked down or has no carrier.
+	 * If netpoll is in uses, then VF can not be used either.
+	 */
+	vf_netdev = rcu_dereference_bh(net_device_ctx->vf_netdev);
+	if (vf_netdev && netif_running(vf_netdev) &&
+	    netif_carrier_ok(vf_netdev) && !netpoll_tx_running(net) &&
+	    net_device_ctx->data_path_is_vf)
+		return netvsc_vf_xmit(net, vf_netdev, skb);
+
+	/* We will atmost need two pages to describe the rndis
+	 * header. We can only transmit MAX_PAGE_BUFFER_COUNT number
+	 * of pages in a single packet. If skb is scattered around
+	 * more pages we try linearizing it.
+	 */
+
+	num_data_pgs = netvsc_get_slots(skb) + 2;
+
+	if (unlikely(num_data_pgs > MAX_PAGE_BUFFER_COUNT)) {
+		++net_device_ctx->eth_stats.tx_scattered;
+
+		if (skb_linearize(skb))
+			goto no_memory;
+
+		num_data_pgs = netvsc_get_slots(skb) + 2;
+		if (num_data_pgs > MAX_PAGE_BUFFER_COUNT) {
+			++net_device_ctx->eth_stats.tx_too_big;
+			goto drop;
+		}
+	}
+
+	/*
+	 * Place the rndis header in the skb head room and
+	 * the skb->cb will be used for hv_netvsc_packet
+	 * structure.
+	 */
+	ret = skb_cow_head(skb, RNDIS_AND_PPI_SIZE);
+	if (ret)
+		goto no_memory;
+
+	/* Use the skb control buffer for building up the packet */
+	BUILD_BUG_ON(sizeof(struct hv_netvsc_packet) >
+			sizeof_field(struct sk_buff, cb));
+	packet = (struct hv_netvsc_packet *)skb->cb;
+
+	packet->q_idx = skb_get_queue_mapping(skb);
+
+	packet->total_data_buflen = skb->len;
+	packet->total_bytes = skb->len;
+	packet->total_packets = 1;
+
+	rndis_msg = (struct rndis_message *)skb->head;
+
+	/* Add the rndis header */
+	rndis_msg->ndis_msg_type = RNDIS_MSG_PACKET;
+	rndis_msg->msg_len = packet->total_data_buflen;
+
+	rndis_msg->msg.pkt = (struct rndis_packet) {
+		.data_offset = sizeof(struct rndis_packet),
+		.data_len = packet->total_data_buflen,
+		.per_pkt_info_offset = sizeof(struct rndis_packet),
+	};
+
+	rndis_msg_size = RNDIS_MESSAGE_SIZE(struct rndis_packet);
+
+	hash = skb_get_hash_raw(skb);
+	if (hash != 0 && net->real_num_tx_queues > 1) {
+		u32 *hash_info;
+
+		rndis_msg_size += NDIS_HASH_PPI_SIZE;
+		hash_info = init_ppi_data(rndis_msg, NDIS_HASH_PPI_SIZE,
+					  NBL_HASH_VALUE);
+		*hash_info = hash;
+	}
+
+	/* When using AF_PACKET we need to drop VLAN header from
+	 * the frame and update the SKB to allow the HOST OS
+	 * to transmit the 802.1Q packet
+	 */
+	if (skb->protocol == htons(ETH_P_8021Q)) {
+		u16 vlan_tci;
+
+		skb_reset_mac_header(skb);
+		if (eth_type_vlan(eth_hdr(skb)->h_proto)) {
+			if (unlikely(__skb_vlan_pop(skb, &vlan_tci) != 0)) {
+				++net_device_ctx->eth_stats.vlan_error;
+				goto drop;
+			}
+
+			__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
+			/* Update the NDIS header pkt lengths */
+			packet->total_data_buflen -= VLAN_HLEN;
+			packet->total_bytes -= VLAN_HLEN;
+			rndis_msg->msg_len = packet->total_data_buflen;
+			rndis_msg->msg.pkt.data_len = packet->total_data_buflen;
+		}
+	}
+
+	if (skb_vlan_tag_present(skb)) {
+		struct ndis_pkt_8021q_info *vlan;
+
+		rndis_msg_size += NDIS_VLAN_PPI_SIZE;
+		vlan = init_ppi_data(rndis_msg, NDIS_VLAN_PPI_SIZE,
+				     IEEE_8021Q_INFO);
+
+		vlan->value = 0;
+		vlan->vlanid = skb_vlan_tag_get_id(skb);
+		vlan->cfi = skb_vlan_tag_get_cfi(skb);
+		vlan->pri = skb_vlan_tag_get_prio(skb);
+	}
+
+	if (skb_is_gso(skb)) {
+		struct ndis_tcp_lso_info *lso_info;
+
+		rndis_msg_size += NDIS_LSO_PPI_SIZE;
+		lso_info = init_ppi_data(rndis_msg, NDIS_LSO_PPI_SIZE,
+					 TCP_LARGESEND_PKTINFO);
+
+		lso_info->value = 0;
+		lso_info->lso_v2_transmit.type = NDIS_TCP_LARGE_SEND_OFFLOAD_V2_TYPE;
+		if (skb->protocol == htons(ETH_P_IP)) {
+			lso_info->lso_v2_transmit.ip_version =
+				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV4;
+			ip_hdr(skb)->tot_len = 0;
+			ip_hdr(skb)->check = 0;
+			tcp_hdr(skb)->check =
+				~csum_tcpudp_magic(ip_hdr(skb)->saddr,
+						   ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
+		} else {
+			lso_info->lso_v2_transmit.ip_version =
+				NDIS_TCP_LARGE_SEND_OFFLOAD_IPV6;
+			tcp_v6_gso_csum_prep(skb);
+		}
+		lso_info->lso_v2_transmit.tcp_header_offset = skb_transport_offset(skb);
+		lso_info->lso_v2_transmit.mss = skb_shinfo(skb)->gso_size;
+	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
+		if (net_checksum_info(skb) & net_device_ctx->tx_checksum_mask) {
+			struct ndis_tcp_ip_checksum_info *csum_info;
+
+			rndis_msg_size += NDIS_CSUM_PPI_SIZE;
+			csum_info = init_ppi_data(rndis_msg, NDIS_CSUM_PPI_SIZE,
+						  TCPIP_CHKSUM_PKTINFO);
+
+			csum_info->value = 0;
+			csum_info->transmit.tcp_header_offset = skb_transport_offset(skb);
+
+			if (skb->protocol == htons(ETH_P_IP)) {
+				csum_info->transmit.is_ipv4 = 1;
+
+				if (ip_hdr(skb)->protocol == IPPROTO_TCP)
+					csum_info->transmit.tcp_checksum = 1;
+				else
+					csum_info->transmit.udp_checksum = 1;
+			} else {
+				csum_info->transmit.is_ipv6 = 1;
+
+				if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
+					csum_info->transmit.tcp_checksum = 1;
+				else
+					csum_info->transmit.udp_checksum = 1;
+			}
+		} else {
+			/* Can't do offload of this type of checksum */
+			if (skb_checksum_help(skb))
+				goto drop;
+		}
+	}
+
+	/* Start filling in the page buffers with the rndis hdr */
+	rndis_msg->msg_len += rndis_msg_size;
+	packet->total_data_buflen = rndis_msg->msg_len;
+	packet->page_buf_cnt = init_page_array(rndis_msg, rndis_msg_size,
+					       skb, packet, pb);
+
+	/* timestamp packet in software */
+	skb_tx_timestamp(skb);
+
+	ret = netvsc_send(net, packet, rndis_msg, pb, skb, xdp_tx);
+	if (likely(ret == 0))
+		return NETDEV_TX_OK;
+
+	if (ret == -EAGAIN) {
+		++net_device_ctx->eth_stats.tx_busy;
+		return NETDEV_TX_BUSY;
+	}
+
+	if (ret == -ENOSPC)
+		++net_device_ctx->eth_stats.tx_no_space;
+
+drop:
+	dev_kfree_skb_any(skb);
+	net->stats.tx_dropped++;
+
+	return NETDEV_TX_OK;
+
+no_memory:
+	++net_device_ctx->eth_stats.tx_no_memory;
+	goto drop;
+}
+
+static netdev_tx_t netvsc_start_xmit(struct sk_buff *skb,
+				     struct net_device *ndev)
+{
+	return netvsc_xmit(skb, ndev, false);
+}
+
+/*
+ * netvsc_linkstatus_callback - Link up/down notification
+ */
+void netvsc_linkstatus_callback(struct net_device *net,
+				struct rndis_message *resp,
+				void *data, u32 data_buflen)
+{
+	struct rndis_indicate_status *indicate = &resp->msg.indicate_status;
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct netvsc_reconfig *event;
+	unsigned long flags;
+
+	/* Ensure the packet is big enough to access its fields */
+	if (resp->msg_len - RNDIS_HEADER_SIZE < sizeof(struct rndis_indicate_status)) {
+		netdev_err(net, "invalid rndis_indicate_status packet, len: %u\n",
+			   resp->msg_len);
+		return;
+	}
+
+	/* Copy the RNDIS indicate status into nvchan->recv_buf */
+	memcpy(indicate, data + RNDIS_HEADER_SIZE, sizeof(*indicate));
+
+	/* Update the physical link speed when changing to another vSwitch */
+	if (indicate->status == RNDIS_STATUS_LINK_SPEED_CHANGE) {
+		u32 speed;
+
+		/* Validate status_buf_offset and status_buflen.
+		 *
+		 * Certain (pre-Fe) implementations of Hyper-V's vSwitch didn't account
+		 * for the status buffer field in resp->msg_len; perform the validation
+		 * using data_buflen (>= resp->msg_len).
+		 */
+		if (indicate->status_buflen < sizeof(speed) ||
+		    indicate->status_buf_offset < sizeof(*indicate) ||
+		    data_buflen - RNDIS_HEADER_SIZE < indicate->status_buf_offset ||
+		    data_buflen - RNDIS_HEADER_SIZE - indicate->status_buf_offset
+				< indicate->status_buflen) {
+			netdev_err(net, "invalid rndis_indicate_status packet\n");
+			return;
+		}
+
+		speed = *(u32 *)(data + RNDIS_HEADER_SIZE + indicate->status_buf_offset) / 10000;
+		ndev_ctx->speed = speed;
+		return;
+	}
+
+	/* Handle these link change statuses below */
+	if (indicate->status != RNDIS_STATUS_NETWORK_CHANGE &&
+	    indicate->status != RNDIS_STATUS_MEDIA_CONNECT &&
+	    indicate->status != RNDIS_STATUS_MEDIA_DISCONNECT)
+		return;
+
+	if (net->reg_state != NETREG_REGISTERED)
+		return;
+
+	event = kzalloc(sizeof(*event), GFP_ATOMIC);
+	if (!event)
+		return;
+	event->event = indicate->status;
+
+	spin_lock_irqsave(&ndev_ctx->lock, flags);
+	list_add_tail(&event->list, &ndev_ctx->reconfig_events);
+	spin_unlock_irqrestore(&ndev_ctx->lock, flags);
+
+	schedule_delayed_work(&ndev_ctx->dwork, 0);
+}
+
+/* This function should only be called after skb_record_rx_queue() */
+void netvsc_xdp_xmit(struct sk_buff *skb, struct net_device *ndev)
+{
+	int rc;
+
+	skb->queue_mapping = skb_get_rx_queue(skb);
+	__skb_push(skb, ETH_HLEN);
+
+	rc = netvsc_xmit(skb, ndev, true);
+
+	if (dev_xmit_complete(rc))
+		return;
+
+	dev_kfree_skb_any(skb);
+	ndev->stats.tx_dropped++;
+}
+
+static void netvsc_comp_ipcsum(struct sk_buff *skb)
+{
+	struct iphdr *iph = (struct iphdr *)skb->data;
+
+	iph->check = 0;
+	iph->check = ip_fast_csum(iph, iph->ihl);
+}
+
+static struct sk_buff *netvsc_alloc_recv_skb(struct net_device *net,
+					     struct netvsc_channel *nvchan,
+					     struct xdp_buff *xdp)
+{
+	struct napi_struct *napi = &nvchan->napi;
+	const struct ndis_pkt_8021q_info *vlan = &nvchan->rsc.vlan;
+	const struct ndis_tcp_ip_checksum_info *csum_info =
+						&nvchan->rsc.csum_info;
+	const u32 *hash_info = &nvchan->rsc.hash_info;
+	u8 ppi_flags = nvchan->rsc.ppi_flags;
+	struct sk_buff *skb;
+	void *xbuf = xdp->data_hard_start;
+	int i;
+
+	if (xbuf) {
+		unsigned int hdroom = xdp->data - xdp->data_hard_start;
+		unsigned int xlen = xdp->data_end - xdp->data;
+		unsigned int frag_size = xdp->frame_sz;
+
+		skb = build_skb(xbuf, frag_size);
+
+		if (!skb) {
+			__free_page(virt_to_page(xbuf));
+			return NULL;
+		}
+
+		skb_reserve(skb, hdroom);
+		skb_put(skb, xlen);
+		skb->dev = napi->dev;
+	} else {
+		skb = napi_alloc_skb(napi, nvchan->rsc.pktlen);
+
+		if (!skb)
+			return NULL;
+
+		/* Copy to skb. This copy is needed here since the memory
+		 * pointed by hv_netvsc_packet cannot be deallocated.
+		 */
+		for (i = 0; i < nvchan->rsc.cnt; i++)
+			skb_put_data(skb, nvchan->rsc.data[i],
+				     nvchan->rsc.len[i]);
+	}
+
+	skb->protocol = eth_type_trans(skb, net);
+
+	/* skb is already created with CHECKSUM_NONE */
+	skb_checksum_none_assert(skb);
+
+	/* Incoming packets may have IP header checksum verified by the host.
+	 * They may not have IP header checksum computed after coalescing.
+	 * We compute it here if the flags are set, because on Linux, the IP
+	 * checksum is always checked.
+	 */
+	if ((ppi_flags & NVSC_RSC_CSUM_INFO) && csum_info->receive.ip_checksum_value_invalid &&
+	    csum_info->receive.ip_checksum_succeeded &&
+	    skb->protocol == htons(ETH_P_IP)) {
+		/* Check that there is enough space to hold the IP header. */
+		if (skb_headlen(skb) < sizeof(struct iphdr)) {
+			kfree_skb(skb);
+			return NULL;
+		}
+		netvsc_comp_ipcsum(skb);
+	}
+
+	/* Do L4 checksum offload if enabled and present. */
+	if ((ppi_flags & NVSC_RSC_CSUM_INFO) && (net->features & NETIF_F_RXCSUM)) {
+		if (csum_info->receive.tcp_checksum_succeeded ||
+		    csum_info->receive.udp_checksum_succeeded)
+			skb->ip_summed = CHECKSUM_UNNECESSARY;
+	}
+
+	if ((ppi_flags & NVSC_RSC_HASH_INFO) && (net->features & NETIF_F_RXHASH))
+		skb_set_hash(skb, *hash_info, PKT_HASH_TYPE_L4);
+
+	if (ppi_flags & NVSC_RSC_VLAN) {
+		u16 vlan_tci = vlan->vlanid | (vlan->pri << VLAN_PRIO_SHIFT) |
+			(vlan->cfi ? VLAN_CFI_MASK : 0);
+
+		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q),
+				       vlan_tci);
+	}
+
+	return skb;
+}
+
+/*
+ * netvsc_recv_callback -  Callback when we receive a packet from the
+ * "wire" on the specified device.
+ */
+int netvsc_recv_callback(struct net_device *net,
+			 struct netvsc_device *net_device,
+			 struct netvsc_channel *nvchan)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct vmbus_channel *channel = nvchan->channel;
+	u16 q_idx = channel->offermsg.offer.sub_channel_index;
+	struct sk_buff *skb;
+	struct netvsc_stats_rx *rx_stats = &nvchan->rx_stats;
+	struct xdp_buff xdp;
+	u32 act;
+
+	if (net->reg_state != NETREG_REGISTERED)
+		return NVSP_STAT_FAIL;
+
+	act = netvsc_run_xdp(net, nvchan, &xdp);
+
+	if (act == XDP_REDIRECT)
+		return NVSP_STAT_SUCCESS;
+
+	if (act != XDP_PASS && act != XDP_TX) {
+		u64_stats_update_begin(&rx_stats->syncp);
+		rx_stats->xdp_drop++;
+		u64_stats_update_end(&rx_stats->syncp);
+
+		return NVSP_STAT_SUCCESS; /* consumed by XDP */
+	}
+
+	/* Allocate a skb - TODO direct I/O to pages? */
+	skb = netvsc_alloc_recv_skb(net, nvchan, &xdp);
+
+	if (unlikely(!skb)) {
+		++net_device_ctx->eth_stats.rx_no_memory;
+		return NVSP_STAT_FAIL;
+	}
+
+	skb_record_rx_queue(skb, q_idx);
+
+	/*
+	 * Even if injecting the packet, record the statistics
+	 * on the synthetic device because modifying the VF device
+	 * statistics will not work correctly.
+	 */
+	u64_stats_update_begin(&rx_stats->syncp);
+	if (act == XDP_TX)
+		rx_stats->xdp_tx++;
+
+	rx_stats->packets++;
+	rx_stats->bytes += nvchan->rsc.pktlen;
+
+	if (skb->pkt_type == PACKET_BROADCAST)
+		++rx_stats->broadcast;
+	else if (skb->pkt_type == PACKET_MULTICAST)
+		++rx_stats->multicast;
+	u64_stats_update_end(&rx_stats->syncp);
+
+	if (act == XDP_TX) {
+		netvsc_xdp_xmit(skb, net);
+		return NVSP_STAT_SUCCESS;
+	}
+
+	napi_gro_receive(&nvchan->napi, skb);
+	return NVSP_STAT_SUCCESS;
+}
+
+static void netvsc_get_drvinfo(struct net_device *net,
+			       struct ethtool_drvinfo *info)
+{
+	strscpy(info->driver, KBUILD_MODNAME, sizeof(info->driver));
+	strscpy(info->fw_version, "N/A", sizeof(info->fw_version));
+}
+
+static void netvsc_get_channels(struct net_device *net,
+				struct ethtool_channels *channel)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
+
+	if (nvdev) {
+		channel->max_combined	= nvdev->max_chn;
+		channel->combined_count = nvdev->num_chn;
+	}
+}
+
+/* Alloc struct netvsc_device_info, and initialize it from either existing
+ * struct netvsc_device, or from default values.
+ */
+static
+struct netvsc_device_info *netvsc_devinfo_get(struct netvsc_device *nvdev)
+{
+	struct netvsc_device_info *dev_info;
+	struct bpf_prog *prog;
+
+	dev_info = kzalloc(sizeof(*dev_info), GFP_ATOMIC);
+
+	if (!dev_info)
+		return NULL;
+
+	if (nvdev) {
+		ASSERT_RTNL();
+
+		dev_info->num_chn = nvdev->num_chn;
+		dev_info->send_sections = nvdev->send_section_cnt;
+		dev_info->send_section_size = nvdev->send_section_size;
+		dev_info->recv_sections = nvdev->recv_section_cnt;
+		dev_info->recv_section_size = nvdev->recv_section_size;
+
+		memcpy(dev_info->rss_key, nvdev->extension->rss_key,
+		       NETVSC_HASH_KEYLEN);
+
+		prog = netvsc_xdp_get(nvdev);
+		if (prog) {
+			bpf_prog_inc(prog);
+			dev_info->bprog = prog;
+		}
+	} else {
+		dev_info->num_chn = VRSS_CHANNEL_DEFAULT;
+		dev_info->send_sections = NETVSC_DEFAULT_TX;
+		dev_info->send_section_size = NETVSC_SEND_SECTION_SIZE;
+		dev_info->recv_sections = NETVSC_DEFAULT_RX;
+		dev_info->recv_section_size = NETVSC_RECV_SECTION_SIZE;
+	}
+
+	return dev_info;
+}
+
+/* Free struct netvsc_device_info */
+static void netvsc_devinfo_put(struct netvsc_device_info *dev_info)
+{
+	if (dev_info->bprog) {
+		ASSERT_RTNL();
+		bpf_prog_put(dev_info->bprog);
+	}
+
+	kfree(dev_info);
+}
+
+static int netvsc_detach(struct net_device *ndev,
+			 struct netvsc_device *nvdev)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+	struct hv_device *hdev = ndev_ctx->device_ctx;
+	int ret;
+
+	/* Don't try continuing to try and setup sub channels */
+	if (cancel_work_sync(&nvdev->subchan_work))
+		nvdev->num_chn = 1;
+
+	netvsc_xdp_set(ndev, NULL, NULL, nvdev);
+
+	/* If device was up (receiving) then shutdown */
+	if (netif_running(ndev)) {
+		netvsc_tx_disable(nvdev, ndev);
+
+		ret = rndis_filter_close(nvdev);
+		if (ret) {
+			netdev_err(ndev,
+				   "unable to close device (ret %d).\n", ret);
+			return ret;
+		}
+
+		ret = netvsc_wait_until_empty(nvdev);
+		if (ret) {
+			netdev_err(ndev,
+				   "Ring buffer not empty after closing rndis\n");
+			return ret;
+		}
+	}
+
+	netif_device_detach(ndev);
+
+	rndis_filter_device_remove(hdev, nvdev);
+
+	return 0;
+}
+
+static int netvsc_attach(struct net_device *ndev,
+			 struct netvsc_device_info *dev_info)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+	struct hv_device *hdev = ndev_ctx->device_ctx;
+	struct netvsc_device *nvdev;
+	struct rndis_device *rdev;
+	struct bpf_prog *prog;
+	int ret = 0;
+
+	nvdev = rndis_filter_device_add(hdev, dev_info);
+	if (IS_ERR(nvdev))
+		return PTR_ERR(nvdev);
+
+	if (nvdev->num_chn > 1) {
+		ret = rndis_set_subchannel(ndev, nvdev, dev_info);
+
+		/* if unavailable, just proceed with one queue */
+		if (ret) {
+			nvdev->max_chn = 1;
+			nvdev->num_chn = 1;
+		}
+	}
+
+	prog = dev_info->bprog;
+	if (prog) {
+		bpf_prog_inc(prog);
+		ret = netvsc_xdp_set(ndev, prog, NULL, nvdev);
+		if (ret) {
+			bpf_prog_put(prog);
+			goto err1;
+		}
+	}
+
+	/* In any case device is now ready */
+	nvdev->tx_disable = false;
+	netif_device_attach(ndev);
+
+	/* Note: enable and attach happen when sub-channels setup */
+	netif_carrier_off(ndev);
+
+	if (netif_running(ndev)) {
+		ret = rndis_filter_open(nvdev);
+		if (ret)
+			goto err2;
+
+		rdev = nvdev->extension;
+		if (!rdev->link_state)
+			netif_carrier_on(ndev);
+	}
+
+	return 0;
+
+err2:
+	netif_device_detach(ndev);
+
+err1:
+	rndis_filter_device_remove(hdev, nvdev);
+
+	return ret;
+}
+
+static int netvsc_set_channels(struct net_device *net,
+			       struct ethtool_channels *channels)
+{
+	struct net_device_context *net_device_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev = rtnl_dereference(net_device_ctx->nvdev);
+	unsigned int orig, count = channels->combined_count;
+	struct netvsc_device_info *device_info;
+	int ret;
+
+	/* We do not support separate count for rx, tx, or other */
+	if (count == 0 ||
+	    channels->rx_count || channels->tx_count || channels->other_count)
+		return -EINVAL;
+
+	if (!nvdev || nvdev->destroy)
+		return -ENODEV;
+
+	if (nvdev->nvsp_version < NVSP_PROTOCOL_VERSION_5)
+		return -EINVAL;
+
+	if (count > nvdev->max_chn)
+		return -EINVAL;
+
+	orig = nvdev->num_chn;
+
+	device_info = netvsc_devinfo_get(nvdev);
+
+	if (!device_info)
+		return -ENOMEM;
+
+	device_info->num_chn = count;
+
+	ret = netvsc_detach(net, nvdev);
+	if (ret)
+		goto out;
+
+	ret = netvsc_attach(net, device_info);
+	if (ret) {
+		device_info->num_chn = orig;
+		if (netvsc_attach(net, device_info))
+			netdev_err(net, "restoring channel setting failed\n");
+	}
+
+out:
+	netvsc_devinfo_put(device_info);
+	return ret;
+}
+
+static void netvsc_init_settings(struct net_device *dev)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+
+	ndc->l4_hash = HV_DEFAULT_L4HASH;
+
+	ndc->speed = SPEED_UNKNOWN;
+	ndc->duplex = DUPLEX_FULL;
+
+	dev->features = NETIF_F_LRO;
+}
+
+static int netvsc_get_link_ksettings(struct net_device *dev,
+				     struct ethtool_link_ksettings *cmd)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct net_device *vf_netdev;
+
+	vf_netdev = rtnl_dereference(ndc->vf_netdev);
+
+	if (vf_netdev)
+		return __ethtool_get_link_ksettings(vf_netdev, cmd);
+
+	cmd->base.speed = ndc->speed;
+	cmd->base.duplex = ndc->duplex;
+	cmd->base.port = PORT_OTHER;
+
+	return 0;
+}
+
+static int netvsc_set_link_ksettings(struct net_device *dev,
+				     const struct ethtool_link_ksettings *cmd)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
+
+	if (vf_netdev) {
+		if (!vf_netdev->ethtool_ops->set_link_ksettings)
+			return -EOPNOTSUPP;
+
+		return vf_netdev->ethtool_ops->set_link_ksettings(vf_netdev,
+								  cmd);
+	}
+
+	return ethtool_virtdev_set_link_ksettings(dev, cmd,
+						  &ndc->speed, &ndc->duplex);
+}
+
+static int netvsc_change_mtu(struct net_device *ndev, int mtu)
+{
+	struct net_device_context *ndevctx = netdev_priv(ndev);
+	struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
+	int orig_mtu = ndev->mtu;
+	struct netvsc_device_info *device_info;
+	int ret = 0;
+
+	if (!nvdev || nvdev->destroy)
+		return -ENODEV;
+
+	device_info = netvsc_devinfo_get(nvdev);
+
+	if (!device_info)
+		return -ENOMEM;
+
+	/* Change MTU of underlying VF netdev first. */
+	if (vf_netdev) {
+		ret = dev_set_mtu(vf_netdev, mtu);
+		if (ret)
+			goto out;
+	}
+
+	ret = netvsc_detach(ndev, nvdev);
+	if (ret)
+		goto rollback_vf;
+
+	ndev->mtu = mtu;
+
+	ret = netvsc_attach(ndev, device_info);
+	if (!ret)
+		goto out;
+
+	/* Attempt rollback to original MTU */
+	ndev->mtu = orig_mtu;
+
+	if (netvsc_attach(ndev, device_info))
+		netdev_err(ndev, "restoring mtu failed\n");
+rollback_vf:
+	if (vf_netdev)
+		dev_set_mtu(vf_netdev, orig_mtu);
+
+out:
+	netvsc_devinfo_put(device_info);
+	return ret;
+}
+
+static void netvsc_get_vf_stats(struct net_device *net,
+				struct netvsc_vf_pcpu_stats *tot)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	int i;
+
+	memset(tot, 0, sizeof(*tot));
+
+	for_each_possible_cpu(i) {
+		const struct netvsc_vf_pcpu_stats *stats
+			= per_cpu_ptr(ndev_ctx->vf_stats, i);
+		u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&stats->syncp);
+			rx_packets = stats->rx_packets;
+			tx_packets = stats->tx_packets;
+			rx_bytes = stats->rx_bytes;
+			tx_bytes = stats->tx_bytes;
+		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+
+		tot->rx_packets += rx_packets;
+		tot->tx_packets += tx_packets;
+		tot->rx_bytes   += rx_bytes;
+		tot->tx_bytes   += tx_bytes;
+		tot->tx_dropped += stats->tx_dropped;
+	}
+}
+
+static void netvsc_get_pcpu_stats(struct net_device *net,
+				  struct netvsc_ethtool_pcpu_stats *pcpu_tot)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev = rcu_dereference_rtnl(ndev_ctx->nvdev);
+	int i;
+
+	/* fetch percpu stats of vf */
+	for_each_possible_cpu(i) {
+		const struct netvsc_vf_pcpu_stats *stats =
+			per_cpu_ptr(ndev_ctx->vf_stats, i);
+		struct netvsc_ethtool_pcpu_stats *this_tot = &pcpu_tot[i];
+		unsigned int start;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&stats->syncp);
+			this_tot->vf_rx_packets = stats->rx_packets;
+			this_tot->vf_tx_packets = stats->tx_packets;
+			this_tot->vf_rx_bytes = stats->rx_bytes;
+			this_tot->vf_tx_bytes = stats->tx_bytes;
+		} while (u64_stats_fetch_retry_irq(&stats->syncp, start));
+		this_tot->rx_packets = this_tot->vf_rx_packets;
+		this_tot->tx_packets = this_tot->vf_tx_packets;
+		this_tot->rx_bytes   = this_tot->vf_rx_bytes;
+		this_tot->tx_bytes   = this_tot->vf_tx_bytes;
+	}
+
+	/* fetch percpu stats of netvsc */
+	for (i = 0; i < nvdev->num_chn; i++) {
+		const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
+		const struct netvsc_stats_tx *tx_stats;
+		const struct netvsc_stats_rx *rx_stats;
+		struct netvsc_ethtool_pcpu_stats *this_tot =
+			&pcpu_tot[nvchan->channel->target_cpu];
+		u64 packets, bytes;
+		unsigned int start;
+
+		tx_stats = &nvchan->tx_stats;
+		do {
+			start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
+			packets = tx_stats->packets;
+			bytes = tx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
+
+		this_tot->tx_bytes	+= bytes;
+		this_tot->tx_packets	+= packets;
+
+		rx_stats = &nvchan->rx_stats;
+		do {
+			start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
+			packets = rx_stats->packets;
+			bytes = rx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
+
+		this_tot->rx_bytes	+= bytes;
+		this_tot->rx_packets	+= packets;
+	}
+}
+
+static void netvsc_get_stats64(struct net_device *net,
+			       struct rtnl_link_stats64 *t)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(net);
+	struct netvsc_device *nvdev;
+	struct netvsc_vf_pcpu_stats vf_tot;
+	int i;
+
+	rcu_read_lock();
+
+	nvdev = rcu_dereference(ndev_ctx->nvdev);
+	if (!nvdev)
+		goto out;
+
+	netdev_stats_to_stats64(t, &net->stats);
+
+	netvsc_get_vf_stats(net, &vf_tot);
+	t->rx_packets += vf_tot.rx_packets;
+	t->tx_packets += vf_tot.tx_packets;
+	t->rx_bytes   += vf_tot.rx_bytes;
+	t->tx_bytes   += vf_tot.tx_bytes;
+	t->tx_dropped += vf_tot.tx_dropped;
+
+	for (i = 0; i < nvdev->num_chn; i++) {
+		const struct netvsc_channel *nvchan = &nvdev->chan_table[i];
+		const struct netvsc_stats_tx *tx_stats;
+		const struct netvsc_stats_rx *rx_stats;
+		u64 packets, bytes, multicast;
+		unsigned int start;
+
+		tx_stats = &nvchan->tx_stats;
+		do {
+			start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
+			packets = tx_stats->packets;
+			bytes = tx_stats->bytes;
+		} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
+
+		t->tx_bytes	+= bytes;
+		t->tx_packets	+= packets;
+
+		rx_stats = &nvchan->rx_stats;
+		do {
+			start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
+			packets = rx_stats->packets;
+			bytes = rx_stats->bytes;
+			multicast = rx_stats->multicast + rx_stats->broadcast;
+		} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
+
+		t->rx_bytes	+= bytes;
+		t->rx_packets	+= packets;
+		t->multicast	+= multicast;
+	}
+out:
+	rcu_read_unlock();
+}
+
+static int netvsc_set_mac_addr(struct net_device *ndev, void *p)
+{
+	struct net_device_context *ndc = netdev_priv(ndev);
+	struct net_device *vf_netdev = rtnl_dereference(ndc->vf_netdev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
+	struct sockaddr *addr = p;
+	int err;
+
+	err = eth_prepare_mac_addr_change(ndev, p);
+	if (err)
+		return err;
+
+	if (!nvdev)
+		return -ENODEV;
+
+	if (vf_netdev) {
+		err = dev_set_mac_address(vf_netdev, addr, NULL);
+		if (err)
+			return err;
+	}
+
+	err = rndis_filter_set_device_mac(nvdev, addr->sa_data);
+	if (!err) {
+		eth_commit_mac_addr_change(ndev, p);
+	} else if (vf_netdev) {
+		/* rollback change on VF */
+		memcpy(addr->sa_data, ndev->dev_addr, ETH_ALEN);
+		dev_set_mac_address(vf_netdev, addr, NULL);
+	}
+
+	return err;
+}
+
+static const struct {
+	char name[ETH_GSTRING_LEN];
+	u16 offset;
+} netvsc_stats[] = {
+	{ "tx_scattered", offsetof(struct netvsc_ethtool_stats, tx_scattered) },
+	{ "tx_no_memory", offsetof(struct netvsc_ethtool_stats, tx_no_memory) },
+	{ "tx_no_space",  offsetof(struct netvsc_ethtool_stats, tx_no_space) },
+	{ "tx_too_big",	  offsetof(struct netvsc_ethtool_stats, tx_too_big) },
+	{ "tx_busy",	  offsetof(struct netvsc_ethtool_stats, tx_busy) },
+	{ "tx_send_full", offsetof(struct netvsc_ethtool_stats, tx_send_full) },
+	{ "rx_comp_busy", offsetof(struct netvsc_ethtool_stats, rx_comp_busy) },
+	{ "rx_no_memory", offsetof(struct netvsc_ethtool_stats, rx_no_memory) },
+	{ "stop_queue", offsetof(struct netvsc_ethtool_stats, stop_queue) },
+	{ "wake_queue", offsetof(struct netvsc_ethtool_stats, wake_queue) },
+	{ "vlan_error", offsetof(struct netvsc_ethtool_stats, vlan_error) },
+}, pcpu_stats[] = {
+	{ "cpu%u_rx_packets",
+		offsetof(struct netvsc_ethtool_pcpu_stats, rx_packets) },
+	{ "cpu%u_rx_bytes",
+		offsetof(struct netvsc_ethtool_pcpu_stats, rx_bytes) },
+	{ "cpu%u_tx_packets",
+		offsetof(struct netvsc_ethtool_pcpu_stats, tx_packets) },
+	{ "cpu%u_tx_bytes",
+		offsetof(struct netvsc_ethtool_pcpu_stats, tx_bytes) },
+	{ "cpu%u_vf_rx_packets",
+		offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_packets) },
+	{ "cpu%u_vf_rx_bytes",
+		offsetof(struct netvsc_ethtool_pcpu_stats, vf_rx_bytes) },
+	{ "cpu%u_vf_tx_packets",
+		offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_packets) },
+	{ "cpu%u_vf_tx_bytes",
+		offsetof(struct netvsc_ethtool_pcpu_stats, vf_tx_bytes) },
+}, vf_stats[] = {
+	{ "vf_rx_packets", offsetof(struct netvsc_vf_pcpu_stats, rx_packets) },
+	{ "vf_rx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, rx_bytes) },
+	{ "vf_tx_packets", offsetof(struct netvsc_vf_pcpu_stats, tx_packets) },
+	{ "vf_tx_bytes",   offsetof(struct netvsc_vf_pcpu_stats, tx_bytes) },
+	{ "vf_tx_dropped", offsetof(struct netvsc_vf_pcpu_stats, tx_dropped) },
+};
+
+#define NETVSC_GLOBAL_STATS_LEN	ARRAY_SIZE(netvsc_stats)
+#define NETVSC_VF_STATS_LEN	ARRAY_SIZE(vf_stats)
+
+/* statistics per queue (rx/tx packets/bytes) */
+#define NETVSC_PCPU_STATS_LEN (num_present_cpus() * ARRAY_SIZE(pcpu_stats))
+
+/* 8 statistics per queue (rx/tx packets/bytes, XDP actions) */
+#define NETVSC_QUEUE_STATS_LEN(dev) ((dev)->num_chn * 8)
+
+static int netvsc_get_sset_count(struct net_device *dev, int string_set)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
+
+	if (!nvdev)
+		return -ENODEV;
+
+	switch (string_set) {
+	case ETH_SS_STATS:
+		return NETVSC_GLOBAL_STATS_LEN
+			+ NETVSC_VF_STATS_LEN
+			+ NETVSC_QUEUE_STATS_LEN(nvdev)
+			+ NETVSC_PCPU_STATS_LEN;
+	default:
+		return -EINVAL;
+	}
+}
+
+static void netvsc_get_ethtool_stats(struct net_device *dev,
+				     struct ethtool_stats *stats, u64 *data)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
+	const void *nds = &ndc->eth_stats;
+	const struct netvsc_stats_tx *tx_stats;
+	const struct netvsc_stats_rx *rx_stats;
+	struct netvsc_vf_pcpu_stats sum;
+	struct netvsc_ethtool_pcpu_stats *pcpu_sum;
+	unsigned int start;
+	u64 packets, bytes;
+	u64 xdp_drop;
+	u64 xdp_redirect;
+	u64 xdp_tx;
+	u64 xdp_xmit;
+	int i, j, cpu;
+
+	if (!nvdev)
+		return;
+
+	for (i = 0; i < NETVSC_GLOBAL_STATS_LEN; i++)
+		data[i] = *(unsigned long *)(nds + netvsc_stats[i].offset);
+
+	netvsc_get_vf_stats(dev, &sum);
+	for (j = 0; j < NETVSC_VF_STATS_LEN; j++)
+		data[i++] = *(u64 *)((void *)&sum + vf_stats[j].offset);
+
+	for (j = 0; j < nvdev->num_chn; j++) {
+		tx_stats = &nvdev->chan_table[j].tx_stats;
+
+		do {
+			start = u64_stats_fetch_begin_irq(&tx_stats->syncp);
+			packets = tx_stats->packets;
+			bytes = tx_stats->bytes;
+			xdp_xmit = tx_stats->xdp_xmit;
+		} while (u64_stats_fetch_retry_irq(&tx_stats->syncp, start));
+		data[i++] = packets;
+		data[i++] = bytes;
+		data[i++] = xdp_xmit;
+
+		rx_stats = &nvdev->chan_table[j].rx_stats;
+		do {
+			start = u64_stats_fetch_begin_irq(&rx_stats->syncp);
+			packets = rx_stats->packets;
+			bytes = rx_stats->bytes;
+			xdp_drop = rx_stats->xdp_drop;
+			xdp_redirect = rx_stats->xdp_redirect;
+			xdp_tx = rx_stats->xdp_tx;
+		} while (u64_stats_fetch_retry_irq(&rx_stats->syncp, start));
+		data[i++] = packets;
+		data[i++] = bytes;
+		data[i++] = xdp_drop;
+		data[i++] = xdp_redirect;
+		data[i++] = xdp_tx;
+	}
+
+	pcpu_sum = kvmalloc_array(num_possible_cpus(),
+				  sizeof(struct netvsc_ethtool_pcpu_stats),
+				  GFP_KERNEL);
+	if (!pcpu_sum)
+		return;
+
+	netvsc_get_pcpu_stats(dev, pcpu_sum);
+	for_each_present_cpu(cpu) {
+		struct netvsc_ethtool_pcpu_stats *this_sum = &pcpu_sum[cpu];
+
+		for (j = 0; j < ARRAY_SIZE(pcpu_stats); j++)
+			data[i++] = *(u64 *)((void *)this_sum
+					     + pcpu_stats[j].offset);
+	}
+	kvfree(pcpu_sum);
+}
+
+static void netvsc_get_strings(struct net_device *dev, u32 stringset, u8 *data)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
+	u8 *p = data;
+	int i, cpu;
+
+	if (!nvdev)
+		return;
+
+	switch (stringset) {
+	case ETH_SS_STATS:
+		for (i = 0; i < ARRAY_SIZE(netvsc_stats); i++)
+			ethtool_sprintf(&p, netvsc_stats[i].name);
+
+		for (i = 0; i < ARRAY_SIZE(vf_stats); i++)
+			ethtool_sprintf(&p, vf_stats[i].name);
+
+		for (i = 0; i < nvdev->num_chn; i++) {
+			ethtool_sprintf(&p, "tx_queue_%u_packets", i);
+			ethtool_sprintf(&p, "tx_queue_%u_bytes", i);
+			ethtool_sprintf(&p, "tx_queue_%u_xdp_xmit", i);
+			ethtool_sprintf(&p, "rx_queue_%u_packets", i);
+			ethtool_sprintf(&p, "rx_queue_%u_bytes", i);
+			ethtool_sprintf(&p, "rx_queue_%u_xdp_drop", i);
+			ethtool_sprintf(&p, "rx_queue_%u_xdp_redirect", i);
+			ethtool_sprintf(&p, "rx_queue_%u_xdp_tx", i);
+		}
+
+		for_each_present_cpu(cpu) {
+			for (i = 0; i < ARRAY_SIZE(pcpu_stats); i++)
+				ethtool_sprintf(&p, pcpu_stats[i].name, cpu);
+		}
+
+		break;
+	}
+}
+
+static int
+netvsc_get_rss_hash_opts(struct net_device_context *ndc,
+			 struct ethtool_rxnfc *info)
+{
+	const u32 l4_flag = RXH_L4_B_0_1 | RXH_L4_B_2_3;
+
+	info->data = RXH_IP_SRC | RXH_IP_DST;
+
+	switch (info->flow_type) {
+	case TCP_V4_FLOW:
+		if (ndc->l4_hash & HV_TCP4_L4HASH)
+			info->data |= l4_flag;
+
+		break;
+
+	case TCP_V6_FLOW:
+		if (ndc->l4_hash & HV_TCP6_L4HASH)
+			info->data |= l4_flag;
+
+		break;
+
+	case UDP_V4_FLOW:
+		if (ndc->l4_hash & HV_UDP4_L4HASH)
+			info->data |= l4_flag;
+
+		break;
+
+	case UDP_V6_FLOW:
+		if (ndc->l4_hash & HV_UDP6_L4HASH)
+			info->data |= l4_flag;
+
+		break;
+
+	case IPV4_FLOW:
+	case IPV6_FLOW:
+		break;
+	default:
+		info->data = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static int
+netvsc_get_rxnfc(struct net_device *dev, struct ethtool_rxnfc *info,
+		 u32 *rules)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndc->nvdev);
+
+	if (!nvdev)
+		return -ENODEV;
+
+	switch (info->cmd) {
+	case ETHTOOL_GRXRINGS:
+		info->data = nvdev->num_chn;
+		return 0;
+
+	case ETHTOOL_GRXFH:
+		return netvsc_get_rss_hash_opts(ndc, info);
+	}
+	return -EOPNOTSUPP;
+}
+
+static int netvsc_set_rss_hash_opts(struct net_device_context *ndc,
+				    struct ethtool_rxnfc *info)
+{
+	if (info->data == (RXH_IP_SRC | RXH_IP_DST |
+			   RXH_L4_B_0_1 | RXH_L4_B_2_3)) {
+		switch (info->flow_type) {
+		case TCP_V4_FLOW:
+			ndc->l4_hash |= HV_TCP4_L4HASH;
+			break;
+
+		case TCP_V6_FLOW:
+			ndc->l4_hash |= HV_TCP6_L4HASH;
+			break;
+
+		case UDP_V4_FLOW:
+			ndc->l4_hash |= HV_UDP4_L4HASH;
+			break;
+
+		case UDP_V6_FLOW:
+			ndc->l4_hash |= HV_UDP6_L4HASH;
+			break;
+
+		default:
+			return -EOPNOTSUPP;
+		}
+
+		return 0;
+	}
+
+	if (info->data == (RXH_IP_SRC | RXH_IP_DST)) {
+		switch (info->flow_type) {
+		case TCP_V4_FLOW:
+			ndc->l4_hash &= ~HV_TCP4_L4HASH;
+			break;
+
+		case TCP_V6_FLOW:
+			ndc->l4_hash &= ~HV_TCP6_L4HASH;
+			break;
+
+		case UDP_V4_FLOW:
+			ndc->l4_hash &= ~HV_UDP4_L4HASH;
+			break;
+
+		case UDP_V6_FLOW:
+			ndc->l4_hash &= ~HV_UDP6_L4HASH;
+			break;
+
+		default:
+			return -EOPNOTSUPP;
+		}
+
+		return 0;
+	}
+
+	return -EOPNOTSUPP;
+}
+
+static int
+netvsc_set_rxnfc(struct net_device *ndev, struct ethtool_rxnfc *info)
+{
+	struct net_device_context *ndc = netdev_priv(ndev);
+
+	if (info->cmd == ETHTOOL_SRXFH)
+		return netvsc_set_rss_hash_opts(ndc, info);
+
+	return -EOPNOTSUPP;
+}
+
+static u32 netvsc_get_rxfh_key_size(struct net_device *dev)
+{
+	return NETVSC_HASH_KEYLEN;
+}
+
+static u32 netvsc_rss_indir_size(struct net_device *dev)
+{
+	return ITAB_NUM;
+}
+
+static int netvsc_get_rxfh(struct net_device *dev, u32 *indir, u8 *key,
+			   u8 *hfunc)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
+	struct rndis_device *rndis_dev;
+	int i;
+
+	if (!ndev)
+		return -ENODEV;
+
+	if (hfunc)
+		*hfunc = ETH_RSS_HASH_TOP;	/* Toeplitz */
+
+	rndis_dev = ndev->extension;
+	if (indir) {
+		for (i = 0; i < ITAB_NUM; i++)
+			indir[i] = ndc->rx_table[i];
+	}
+
+	if (key)
+		memcpy(key, rndis_dev->rss_key, NETVSC_HASH_KEYLEN);
+
+	return 0;
+}
+
+static int netvsc_set_rxfh(struct net_device *dev, const u32 *indir,
+			   const u8 *key, const u8 hfunc)
+{
+	struct net_device_context *ndc = netdev_priv(dev);
+	struct netvsc_device *ndev = rtnl_dereference(ndc->nvdev);
+	struct rndis_device *rndis_dev;
+	int i;
+
+	if (!ndev)
+		return -ENODEV;
+
+	if (hfunc != ETH_RSS_HASH_NO_CHANGE && hfunc != ETH_RSS_HASH_TOP)
+		return -EOPNOTSUPP;
+
+	rndis_dev = ndev->extension;
+	if (indir) {
+		for (i = 0; i < ITAB_NUM; i++)
+			if (indir[i] >= ndev->num_chn)
+				return -EINVAL;
+
+		for (i = 0; i < ITAB_NUM; i++)
+			ndc->rx_table[i] = indir[i];
+	}
+
+	if (!key) {
+		if (!indir)
+			return 0;
+
+		key = rndis_dev->rss_key;
+	}
+
+	return rndis_filter_set_rss_param(rndis_dev, key);
+}
+
+/* Hyper-V RNDIS protocol does not have ring in the HW sense.
+ * It does have pre-allocated receive area which is divided into sections.
+ */
+static void __netvsc_get_ringparam(struct netvsc_device *nvdev,
+				   struct ethtool_ringparam *ring)
+{
+	u32 max_buf_size;
+
+	ring->rx_pending = nvdev->recv_section_cnt;
+	ring->tx_pending = nvdev->send_section_cnt;
+
+	if (nvdev->nvsp_version <= NVSP_PROTOCOL_VERSION_2)
+		max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE_LEGACY;
+	else
+		max_buf_size = NETVSC_RECEIVE_BUFFER_SIZE;
+
+	ring->rx_max_pending = max_buf_size / nvdev->recv_section_size;
+	ring->tx_max_pending = NETVSC_SEND_BUFFER_SIZE
+		/ nvdev->send_section_size;
+}
+
+static void netvsc_get_ringparam(struct net_device *ndev,
+				 struct ethtool_ringparam *ring,
+				 struct kernel_ethtool_ringparam *kernel_ring,
+				 struct netlink_ext_ack *extack)
+{
+	struct net_device_context *ndevctx = netdev_priv(ndev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
+
+	if (!nvdev)
+		return;
+
+	__netvsc_get_ringparam(nvdev, ring);
+}
+
+static int netvsc_set_ringparam(struct net_device *ndev,
+				struct ethtool_ringparam *ring,
+				struct kernel_ethtool_ringparam *kernel_ring,
+				struct netlink_ext_ack *extack)
+{
+	struct net_device_context *ndevctx = netdev_priv(ndev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
+	struct netvsc_device_info *device_info;
+	struct ethtool_ringparam orig;
+	u32 new_tx, new_rx;
+	int ret = 0;
+
+	if (!nvdev || nvdev->destroy)
+		return -ENODEV;
+
+	memset(&orig, 0, sizeof(orig));
+	__netvsc_get_ringparam(nvdev, &orig);
+
+	new_tx = clamp_t(u32, ring->tx_pending,
+			 NETVSC_MIN_TX_SECTIONS, orig.tx_max_pending);
+	new_rx = clamp_t(u32, ring->rx_pending,
+			 NETVSC_MIN_RX_SECTIONS, orig.rx_max_pending);
+
+	if (new_tx == orig.tx_pending &&
+	    new_rx == orig.rx_pending)
+		return 0;	 /* no change */
+
+	device_info = netvsc_devinfo_get(nvdev);
+
+	if (!device_info)
+		return -ENOMEM;
+
+	device_info->send_sections = new_tx;
+	device_info->recv_sections = new_rx;
+
+	ret = netvsc_detach(ndev, nvdev);
+	if (ret)
+		goto out;
+
+	ret = netvsc_attach(ndev, device_info);
+	if (ret) {
+		device_info->send_sections = orig.tx_pending;
+		device_info->recv_sections = orig.rx_pending;
+
+		if (netvsc_attach(ndev, device_info))
+			netdev_err(ndev, "restoring ringparam failed");
+	}
+
+out:
+	netvsc_devinfo_put(device_info);
+	return ret;
+}
+
+static netdev_features_t netvsc_fix_features(struct net_device *ndev,
+					     netdev_features_t features)
+{
+	struct net_device_context *ndevctx = netdev_priv(ndev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
+
+	if (!nvdev || nvdev->destroy)
+		return features;
+
+	if ((features & NETIF_F_LRO) && netvsc_xdp_get(nvdev)) {
+		features ^= NETIF_F_LRO;
+		netdev_info(ndev, "Skip LRO - unsupported with XDP\n");
+	}
+
+	return features;
+}
+
+static int netvsc_set_features(struct net_device *ndev,
+			       netdev_features_t features)
+{
+	netdev_features_t change = features ^ ndev->features;
+	struct net_device_context *ndevctx = netdev_priv(ndev);
+	struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev);
+	struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev);
+	struct ndis_offload_params offloads;
+	int ret = 0;
+
+	if (!nvdev || nvdev->destroy)
+		return -ENODEV;
+
+	if (!(change & NETIF_F_LRO))
+		goto syncvf;
+
+	memset(&offloads, 0, sizeof(struct ndis_offload_params));
+
+	if (features & NETIF_F_LRO) {
+		offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
+		offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_ENABLED;
+	} else {
+		offloads.rsc_ip_v4 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
+		offloads.rsc_ip_v6 = NDIS_OFFLOAD_PARAMETERS_RSC_DISABLED;
+	}
+
+	ret = rndis_filter_set_offload_params(ndev, nvdev, &offloads);
+
+	if (ret) {
+		features ^= NETIF_F_LRO;
+		ndev->features = features;
+	}
+
+syncvf:
+	if (!vf_netdev)
+		return ret;
+
+	vf_netdev->wanted_features = features;
+	netdev_update_features(vf_netdev);
+
+	return ret;
+}
+
+static int netvsc_get_regs_len(struct net_device *netdev)
+{
+	return VRSS_SEND_TAB_SIZE * sizeof(u32);
+}
+
+static void netvsc_get_regs(struct net_device *netdev,
+			    struct ethtool_regs *regs, void *p)
+{
+	struct net_device_context *ndc = netdev_priv(netdev);
+	u32 *regs_buff = p;
+
+	/* increase the version, if buffer format is changed. */
+	regs->version = 1;
+
+	memcpy(regs_buff, ndc->tx_table, VRSS_SEND_TAB_SIZE * sizeof(u32));
+}
+
+static u32 netvsc_get_msglevel(struct net_device *ndev)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+
+	return ndev_ctx->msg_enable;
+}
+
+static void netvsc_set_msglevel(struct net_device *ndev, u32 val)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+
+	ndev_ctx->msg_enable = val;
+}
+
+static const struct ethtool_ops ethtool_ops = {
+	.get_drvinfo	= netvsc_get_drvinfo,
+	.get_regs_len	= netvsc_get_regs_len,
+	.get_regs	= netvsc_get_regs,
+	.get_msglevel	= netvsc_get_msglevel,
+	.set_msglevel	= netvsc_set_msglevel,
+	.get_link	= ethtool_op_get_link,
+	.get_ethtool_stats = netvsc_get_ethtool_stats,
+	.get_sset_count = netvsc_get_sset_count,
+	.get_strings	= netvsc_get_strings,
+	.get_channels   = netvsc_get_channels,
+	.set_channels   = netvsc_set_channels,
+	.get_ts_info	= ethtool_op_get_ts_info,
+	.get_rxnfc	= netvsc_get_rxnfc,
+	.set_rxnfc	= netvsc_set_rxnfc,
+	.get_rxfh_key_size = netvsc_get_rxfh_key_size,
+	.get_rxfh_indir_size = netvsc_rss_indir_size,
+	.get_rxfh	= netvsc_get_rxfh,
+	.set_rxfh	= netvsc_set_rxfh,
+	.get_link_ksettings = netvsc_get_link_ksettings,
+	.set_link_ksettings = netvsc_set_link_ksettings,
+	.get_ringparam	= netvsc_get_ringparam,
+	.set_ringparam	= netvsc_set_ringparam,
+};
+
+static const struct net_device_ops device_ops = {
+	.ndo_open =			netvsc_open,
+	.ndo_stop =			netvsc_close,
+	.ndo_start_xmit =		netvsc_start_xmit,
+	.ndo_change_rx_flags =		netvsc_change_rx_flags,
+	.ndo_set_rx_mode =		netvsc_set_rx_mode,
+	.ndo_fix_features =		netvsc_fix_features,
+	.ndo_set_features =		netvsc_set_features,
+	.ndo_change_mtu =		netvsc_change_mtu,
+	.ndo_validate_addr =		eth_validate_addr,
+	.ndo_set_mac_address =		netvsc_set_mac_addr,
+	.ndo_select_queue =		netvsc_select_queue,
+	.ndo_get_stats64 =		netvsc_get_stats64,
+	.ndo_bpf =			netvsc_bpf,
+	.ndo_xdp_xmit =			netvsc_ndoxdp_xmit,
+};
+
+/*
+ * Handle link status changes. For RNDIS_STATUS_NETWORK_CHANGE emulate link
+ * down/up sequence. In case of RNDIS_STATUS_MEDIA_CONNECT when carrier is
+ * present send GARP packet to network peers with netif_notify_peers().
+ */
+static void netvsc_link_change(struct work_struct *w)
+{
+	struct net_device_context *ndev_ctx =
+		container_of(w, struct net_device_context, dwork.work);
+	struct hv_device *device_obj = ndev_ctx->device_ctx;
+	struct net_device *net = hv_get_drvdata(device_obj);
+	unsigned long flags, next_reconfig, delay;
+	struct netvsc_reconfig *event = NULL;
+	struct netvsc_device *net_device;
+	struct rndis_device *rdev;
+	bool reschedule = false;
+
+	/* if changes are happening, comeback later */
+	if (!rtnl_trylock()) {
+		schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
+		return;
+	}
+
+	net_device = rtnl_dereference(ndev_ctx->nvdev);
+	if (!net_device)
+		goto out_unlock;
+
+	rdev = net_device->extension;
+
+	next_reconfig = ndev_ctx->last_reconfig + LINKCHANGE_INT;
+	if (time_is_after_jiffies(next_reconfig)) {
+		/* link_watch only sends one notification with current state
+		 * per second, avoid doing reconfig more frequently. Handle
+		 * wrap around.
+		 */
+		delay = next_reconfig - jiffies;
+		delay = delay < LINKCHANGE_INT ? delay : LINKCHANGE_INT;
+		schedule_delayed_work(&ndev_ctx->dwork, delay);
+		goto out_unlock;
+	}
+	ndev_ctx->last_reconfig = jiffies;
+
+	spin_lock_irqsave(&ndev_ctx->lock, flags);
+	if (!list_empty(&ndev_ctx->reconfig_events)) {
+		event = list_first_entry(&ndev_ctx->reconfig_events,
+					 struct netvsc_reconfig, list);
+		list_del(&event->list);
+		reschedule = !list_empty(&ndev_ctx->reconfig_events);
+	}
+	spin_unlock_irqrestore(&ndev_ctx->lock, flags);
+
+	if (!event)
+		goto out_unlock;
+
+	switch (event->event) {
+		/* Only the following events are possible due to the check in
+		 * netvsc_linkstatus_callback()
+		 */
+	case RNDIS_STATUS_MEDIA_CONNECT:
+		if (rdev->link_state) {
+			rdev->link_state = false;
+			netif_carrier_on(net);
+			netvsc_tx_enable(net_device, net);
+		} else {
+			__netdev_notify_peers(net);
+		}
+		kfree(event);
+		break;
+	case RNDIS_STATUS_MEDIA_DISCONNECT:
+		if (!rdev->link_state) {
+			rdev->link_state = true;
+			netif_carrier_off(net);
+			netvsc_tx_disable(net_device, net);
+		}
+		kfree(event);
+		break;
+	case RNDIS_STATUS_NETWORK_CHANGE:
+		/* Only makes sense if carrier is present */
+		if (!rdev->link_state) {
+			rdev->link_state = true;
+			netif_carrier_off(net);
+			netvsc_tx_disable(net_device, net);
+			event->event = RNDIS_STATUS_MEDIA_CONNECT;
+			spin_lock_irqsave(&ndev_ctx->lock, flags);
+			list_add(&event->list, &ndev_ctx->reconfig_events);
+			spin_unlock_irqrestore(&ndev_ctx->lock, flags);
+			reschedule = true;
+		}
+		break;
+	}
+
+	rtnl_unlock();
+
+	/* link_watch only sends one notification with current state per
+	 * second, handle next reconfig event in 2 seconds.
+	 */
+	if (reschedule)
+		schedule_delayed_work(&ndev_ctx->dwork, LINKCHANGE_INT);
+
+	return;
+
+out_unlock:
+	rtnl_unlock();
+}
+
+static struct net_device *get_netvsc_byref(struct net_device *vf_netdev)
+{
+	struct net_device_context *net_device_ctx;
+	struct net_device *dev;
+
+	dev = netdev_master_upper_dev_get(vf_netdev);
+	if (!dev || dev->netdev_ops != &device_ops)
+		return NULL;	/* not a netvsc device */
+
+	net_device_ctx = netdev_priv(dev);
+	if (!rtnl_dereference(net_device_ctx->nvdev))
+		return NULL;	/* device is removed */
+
+	return dev;
+}
+
+/* Called when VF is injecting data into network stack.
+ * Change the associated network device from VF to netvsc.
+ * note: already called with rcu_read_lock
+ */
+static rx_handler_result_t netvsc_vf_handle_frame(struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+	struct net_device *ndev = rcu_dereference(skb->dev->rx_handler_data);
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+	struct netvsc_vf_pcpu_stats *pcpu_stats
+		 = this_cpu_ptr(ndev_ctx->vf_stats);
+
+	skb = skb_share_check(skb, GFP_ATOMIC);
+	if (unlikely(!skb))
+		return RX_HANDLER_CONSUMED;
+
+	*pskb = skb;
+
+	skb->dev = ndev;
+
+	u64_stats_update_begin(&pcpu_stats->syncp);
+	pcpu_stats->rx_packets++;
+	pcpu_stats->rx_bytes += skb->len;
+	u64_stats_update_end(&pcpu_stats->syncp);
+
+	return RX_HANDLER_ANOTHER;
+}
+
+static int netvsc_vf_join(struct net_device *vf_netdev,
+			  struct net_device *ndev)
+{
+	struct net_device_context *ndev_ctx = netdev_priv(ndev);
+	int ret;
+
+	ret = netdev_rx_handler_register(vf_netdev,
+					 netvsc_vf_handle_frame, ndev);
+	if (ret != 0) {
+		netdev_err(vf_netdev,
+			   "can not register netvsc VF receive handler (err = %d)\n",
+			   ret);
+		goto rx_handler_failed;
+	}
+
+	ret = netdev_master_upper_dev_link(vf_netdev, ndev,
+					   NULL, NULL, NULL);
+	if (ret != 0) {
+		netdev_err(vf_netdev,
+			   "can not set master device %s (err = %d)\n",
+			   ndev->name, ret);
+		goto upper_link_failed;
+	}
+
+	schedule_delayed_work(&ndev_ctx->vf_takeover, VF_TAKEOVER_INT);
+
+	call_netdevice_notifiers(NETDEV_JOIN, vf_netdev);
+
+	netdev_info(vf_netdev, "joined to %s\n", ndev->name);
+	return 0;
+
+upper_link_failed:
+	netdev_rx_handler_unregister(vf_netdev);
+rx_handler_failed:
+	return ret;
+}
+
+static void __netvsc_vf_setup(struct net_device *ndev,
+			      struct net_device *vf_netdev)
+{
+	int ret;
+
+	/* Align MTU of VF with master */
+	ret = dev_set_mtu(vf_netdev, ndev->mtu);
+	if (ret)
+		netdev_warn(vf_netdev,
+			    "unable to change mtu to %u\n", ndev->mtu);
+
+	/* set multicast etc flags on VF */
+	dev_change_flags(vf_netdev, ndev->flags | IFF_SLAVE, NULL);
+
+	/* sync address list from ndev to VF */
+	netif_addr_lock_bh(ndev);
+	dev_uc_sync(vf_netdev, ndev);
+	dev_mc_sync(vf_netdev, ndev);
+	netif_addr_unlock_bh(ndev);
+
+	if (netif_running(ndev)) {
+		ret = dev_open(vf_netdev, NULL);
+		if (ret)
+			netdev_warn(vf_netdev,
+				    "unable to open: %d\n", ret);
+	}
+}
+
+/* Setup VF as slave of the synthetic device.
+ * Runs in workqueue to avoid recursion in netlink callbacks.
+ */
+static void netvsc_vf_setup(struct work_struct *w)
+{
+	struct net_device_context *ndev_ctx
+		= container_of(w, struct net_device_context, vf_takeover.work);
+	struct net_device *ndev = hv_get_drvdata(ndev_ctx->device_ctx);
+	struct net_device *vf_netdev;
+
+	if (!rtnl_trylock()) {
+		schedule_delayed_work(&ndev_ctx->vf_takeover, 0);
+		return;
+	}
+
+	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+	if (vf_netdev)
+		__netvsc_vf_setup(ndev, vf_netdev);
+
+	rtnl_unlock();
+}
+
+/* Find netvsc by VF serial number.
+ * The PCI hyperv controller records the serial number as the slot kobj name.
+ */
+static struct net_device *get_netvsc_byslot(const struct net_device *vf_netdev)
+{
+	struct device *parent = vf_netdev->dev.parent;
+	struct net_device_context *ndev_ctx;
+	struct net_device *ndev;
+	struct pci_dev *pdev;
+	u32 serial;
+
+	if (!parent || !dev_is_pci(parent))
+		return NULL; /* not a PCI device */
+
+	pdev = to_pci_dev(parent);
+	if (!pdev->slot) {
+		netdev_notice(vf_netdev, "no PCI slot information\n");
+		return NULL;
+	}
+
+	if (kstrtou32(pci_slot_name(pdev->slot), 10, &serial)) {
+		netdev_notice(vf_netdev, "Invalid vf serial:%s\n",
+			      pci_slot_name(pdev->slot));
+		return NULL;
+	}
+
+	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
+		if (!ndev_ctx->vf_alloc)
+			continue;
+
+		if (ndev_ctx->vf_serial != serial)
+			continue;
+
+		ndev = hv_get_drvdata(ndev_ctx->device_ctx);
+		if (ndev->addr_len != vf_netdev->addr_len ||
+		    memcmp(ndev->perm_addr, vf_netdev->perm_addr,
+			   ndev->addr_len) != 0)
+			continue;
+
+		return ndev;
+
+	}
+
+	/* Fallback path to check synthetic vf with help of mac addr.
+	 * Because this function can be called before vf_netdev is
+	 * initialized (NETDEV_POST_INIT) when its perm_addr has not been copied
+	 * from dev_addr, also try to match to its dev_addr.
+	 * Note: On Hyper-V and Azure, it's not possible to set a MAC address
+	 * on a VF that matches to the MAC of a unrelated NETVSC device.
+	 */
+	list_for_each_entry(ndev_ctx, &netvsc_dev_list, list) {
+		ndev = hv_get_drvdata(ndev_ctx->device_ctx);
+		if (ether_addr_equal(vf_netdev->perm_addr, ndev->perm_addr) ||
+		    ether_addr_equal(vf_netdev->dev_addr, ndev->perm_addr))
+			return ndev;
+	}
+
+	netdev_notice(vf_netdev,
+		      "no netdev found for vf serial:%u\n", serial);
+	return NULL;
+}
+
+static int netvsc_prepare_bonding(struct net_device *vf_netdev)
+{
+	struct net_device *ndev;
+
+	ndev = get_netvsc_byslot(vf_netdev);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	/* set slave flag before open to prevent IPv6 addrconf */
+	vf_netdev->flags |= IFF_SLAVE;
+	return NOTIFY_DONE;
+}
+
+static int netvsc_register_vf(struct net_device *vf_netdev)
+{
+	struct net_device_context *net_device_ctx;
+	struct netvsc_device *netvsc_dev;
+	struct bpf_prog *prog;
+	struct net_device *ndev;
+	int ret;
+
+	if (vf_netdev->addr_len != ETH_ALEN)
+		return NOTIFY_DONE;
+
+	ndev = get_netvsc_byslot(vf_netdev);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
+	if (!netvsc_dev || rtnl_dereference(net_device_ctx->vf_netdev))
+		return NOTIFY_DONE;
+
+	/* if synthetic interface is a different namespace,
+	 * then move the VF to that namespace; join will be
+	 * done again in that context.
+	 */
+	if (!net_eq(dev_net(ndev), dev_net(vf_netdev))) {
+		ret = dev_change_net_namespace(vf_netdev,
+					       dev_net(ndev), "eth%d");
+		if (ret)
+			netdev_err(vf_netdev,
+				   "could not move to same namespace as %s: %d\n",
+				   ndev->name, ret);
+		else
+			netdev_info(vf_netdev,
+				    "VF moved to namespace with: %s\n",
+				    ndev->name);
+		return NOTIFY_DONE;
+	}
+
+	netdev_info(ndev, "VF registering: %s\n", vf_netdev->name);
+
+	if (netvsc_vf_join(vf_netdev, ndev) != 0)
+		return NOTIFY_DONE;
+
+	dev_hold(vf_netdev);
+	rcu_assign_pointer(net_device_ctx->vf_netdev, vf_netdev);
+
+	if (ndev->needed_headroom < vf_netdev->needed_headroom)
+		ndev->needed_headroom = vf_netdev->needed_headroom;
+
+	vf_netdev->wanted_features = ndev->features;
+	netdev_update_features(vf_netdev);
+
+	prog = netvsc_xdp_get(netvsc_dev);
+	netvsc_vf_setxdp(vf_netdev, prog);
+
+	return NOTIFY_OK;
+}
+
+/* Change the data path when VF UP/DOWN/CHANGE are detected.
+ *
+ * Typically a UP or DOWN event is followed by a CHANGE event, so
+ * net_device_ctx->data_path_is_vf is used to cache the current data path
+ * to avoid the duplicate call of netvsc_switch_datapath() and the duplicate
+ * message.
+ *
+ * During hibernation, if a VF NIC driver (e.g. mlx5) preserves the network
+ * interface, there is only the CHANGE event and no UP or DOWN event.
+ */
+static int netvsc_vf_changed(struct net_device *vf_netdev, unsigned long event)
+{
+	struct net_device_context *net_device_ctx;
+	struct netvsc_device *netvsc_dev;
+	struct net_device *ndev;
+	bool vf_is_up = false;
+	int ret;
+
+	if (event != NETDEV_GOING_DOWN)
+		vf_is_up = netif_running(vf_netdev);
+
+	ndev = get_netvsc_byref(vf_netdev);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	netvsc_dev = rtnl_dereference(net_device_ctx->nvdev);
+	if (!netvsc_dev)
+		return NOTIFY_DONE;
+
+	if (net_device_ctx->data_path_is_vf == vf_is_up)
+		return NOTIFY_OK;
+
+	if (vf_is_up && !net_device_ctx->vf_alloc) {
+		netdev_info(ndev, "Waiting for the VF association from host\n");
+		wait_for_completion(&net_device_ctx->vf_add);
+	}
+
+	ret = netvsc_switch_datapath(ndev, vf_is_up);
+
+	if (ret) {
+		netdev_err(ndev,
+			   "Data path failed to switch %s VF: %s, err: %d\n",
+			   vf_is_up ? "to" : "from", vf_netdev->name, ret);
+		return NOTIFY_DONE;
+	} else {
+		netdev_info(ndev, "Data path switched %s VF: %s\n",
+			    vf_is_up ? "to" : "from", vf_netdev->name);
+	}
+
+	return NOTIFY_OK;
+}
+
+static int netvsc_unregister_vf(struct net_device *vf_netdev)
+{
+	struct net_device *ndev;
+	struct net_device_context *net_device_ctx;
+
+	ndev = get_netvsc_byref(vf_netdev);
+	if (!ndev)
+		return NOTIFY_DONE;
+
+	net_device_ctx = netdev_priv(ndev);
+	cancel_delayed_work_sync(&net_device_ctx->vf_takeover);
+
+	netdev_info(ndev, "VF unregistering: %s\n", vf_netdev->name);
+
+	netvsc_vf_setxdp(vf_netdev, NULL);
+
+	reinit_completion(&net_device_ctx->vf_add);
+	netdev_rx_handler_unregister(vf_netdev);
+	netdev_upper_dev_unlink(vf_netdev, ndev);
+	RCU_INIT_POINTER(net_device_ctx->vf_netdev, NULL);
+	dev_put(vf_netdev);
+
+	ndev->needed_headroom = RNDIS_AND_PPI_SIZE;
+
+	return NOTIFY_OK;
+}
+
+static int netvsc_probe(struct hv_device *dev,
+			const struct hv_vmbus_device_id *dev_id)
+{
+	struct net_device *net = NULL;
+	struct net_device_context *net_device_ctx;
+	struct netvsc_device_info *device_info = NULL;
+	struct netvsc_device *nvdev;
+	int ret = -ENOMEM;
+
+	net = alloc_etherdev_mq(sizeof(struct net_device_context),
+				VRSS_CHANNEL_MAX);
+	if (!net)
+		goto no_net;
+
+	netif_carrier_off(net);
+
+	netvsc_init_settings(net);
+
+	net_device_ctx = netdev_priv(net);
+	net_device_ctx->device_ctx = dev;
+	net_device_ctx->msg_enable = netif_msg_init(debug, default_msg);
+	if (netif_msg_probe(net_device_ctx))
+		netdev_dbg(net, "netvsc msg_enable: %d\n",
+			   net_device_ctx->msg_enable);
+
+	hv_set_drvdata(dev, net);
+
+	INIT_DELAYED_WORK(&net_device_ctx->dwork, netvsc_link_change);
+
+	init_completion(&net_device_ctx->vf_add);
+	spin_lock_init(&net_device_ctx->lock);
+	INIT_LIST_HEAD(&net_device_ctx->reconfig_events);
+	INIT_DELAYED_WORK(&net_device_ctx->vf_takeover, netvsc_vf_setup);
+
+	net_device_ctx->vf_stats
+		= netdev_alloc_pcpu_stats(struct netvsc_vf_pcpu_stats);
+	if (!net_device_ctx->vf_stats)
+		goto no_stats;
+
+	net->netdev_ops = &device_ops;
+	net->ethtool_ops = &ethtool_ops;
+	SET_NETDEV_DEV(net, &dev->device);
+	dma_set_min_align_mask(&dev->device, HV_HYP_PAGE_SIZE - 1);
+
+	/* We always need headroom for rndis header */
+	net->needed_headroom = RNDIS_AND_PPI_SIZE;
+
+	/* Initialize the number of queues to be 1, we may change it if more
+	 * channels are offered later.
+	 */
+	netif_set_real_num_tx_queues(net, 1);
+	netif_set_real_num_rx_queues(net, 1);
+
+	/* Notify the netvsc driver of the new device */
+	device_info = netvsc_devinfo_get(NULL);
+
+	if (!device_info) {
+		ret = -ENOMEM;
+		goto devinfo_failed;
+	}
+
+	/* We must get rtnl lock before scheduling nvdev->subchan_work,
+	 * otherwise netvsc_subchan_work() can get rtnl lock first and wait
+	 * all subchannels to show up, but that may not happen because
+	 * netvsc_probe() can't get rtnl lock and as a result vmbus_onoffer()
+	 * -> ... -> device_add() -> ... -> __device_attach() can't get
+	 * the device lock, so all the subchannels can't be processed --
+	 * finally netvsc_subchan_work() hangs forever.
+	 *
+	 * The rtnl lock also needs to be held before rndis_filter_device_add()
+	 * which advertises nvsp_2_vsc_capability / sriov bit, and triggers
+	 * VF NIC offering and registering. If VF NIC finished register_netdev()
+	 * earlier it may cause name based config failure.
+	 */
+	rtnl_lock();
+
+	nvdev = rndis_filter_device_add(dev, device_info);
+	if (IS_ERR(nvdev)) {
+		ret = PTR_ERR(nvdev);
+		netdev_err(net, "unable to add netvsc device (ret %d)\n", ret);
+		goto rndis_failed;
+	}
+
+	eth_hw_addr_set(net, device_info->mac_adr);
+
+	if (nvdev->num_chn > 1)
+		schedule_work(&nvdev->subchan_work);
+
+	/* hw_features computed in rndis_netdev_set_hwcaps() */
+	net->features = net->hw_features |
+		NETIF_F_HIGHDMA | NETIF_F_HW_VLAN_CTAG_TX |
+		NETIF_F_HW_VLAN_CTAG_RX;
+	net->vlan_features = net->features;
+
+	netdev_lockdep_set_classes(net);
+
+	/* MTU range: 68 - 1500 or 65521 */
+	net->min_mtu = NETVSC_MTU_MIN;
+	if (nvdev->nvsp_version >= NVSP_PROTOCOL_VERSION_2)
+		net->max_mtu = NETVSC_MTU - ETH_HLEN;
+	else
+		net->max_mtu = ETH_DATA_LEN;
+
+	nvdev->tx_disable = false;
+
+	ret = register_netdevice(net);
+	if (ret != 0) {
+		pr_err("Unable to register netdev.\n");
+		goto register_failed;
+	}
+
+	list_add(&net_device_ctx->list, &netvsc_dev_list);
+	rtnl_unlock();
+
+	netvsc_devinfo_put(device_info);
+	return 0;
+
+register_failed:
+	rndis_filter_device_remove(dev, nvdev);
+rndis_failed:
+	rtnl_unlock();
+	netvsc_devinfo_put(device_info);
+devinfo_failed:
+	free_percpu(net_device_ctx->vf_stats);
+no_stats:
+	hv_set_drvdata(dev, NULL);
+	free_netdev(net);
+no_net:
+	return ret;
+}
+
+static int netvsc_remove(struct hv_device *dev)
+{
+	struct net_device_context *ndev_ctx;
+	struct net_device *vf_netdev, *net;
+	struct netvsc_device *nvdev;
+
+	net = hv_get_drvdata(dev);
+	if (net == NULL) {
+		dev_err(&dev->device, "No net device to remove\n");
+		return 0;
+	}
+
+	ndev_ctx = netdev_priv(net);
+
+	cancel_delayed_work_sync(&ndev_ctx->dwork);
+
+	rtnl_lock();
+	nvdev = rtnl_dereference(ndev_ctx->nvdev);
+	if (nvdev) {
+		cancel_work_sync(&nvdev->subchan_work);
+		netvsc_xdp_set(net, NULL, NULL, nvdev);
+	}
+
+	/*
+	 * Call to the vsc driver to let it know that the device is being
+	 * removed. Also blocks mtu and channel changes.
+	 */
+	vf_netdev = rtnl_dereference(ndev_ctx->vf_netdev);
+	if (vf_netdev)
+		netvsc_unregister_vf(vf_netdev);
+
+	if (nvdev)
+		rndis_filter_device_remove(dev, nvdev);
+
+	unregister_netdevice(net);
+	list_del(&ndev_ctx->list);
+
+	rtnl_unlock();
+
+	hv_set_drvdata(dev, NULL);
+
+	free_percpu(ndev_ctx->vf_stats);
+	free_netdev(net);
+	return 0;
+}
+
+static int netvsc_suspend(struct hv_device *dev)
+{
+	struct net_device_context *ndev_ctx;
+	struct netvsc_device *nvdev;
+	struct net_device *net;
+	int ret;
+
+	net = hv_get_drvdata(dev);
+
+	ndev_ctx = netdev_priv(net);
+	cancel_delayed_work_sync(&ndev_ctx->dwork);
+
+	rtnl_lock();
+
+	nvdev = rtnl_dereference(ndev_ctx->nvdev);
+	if (nvdev == NULL) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	/* Save the current config info */
+	ndev_ctx->saved_netvsc_dev_info = netvsc_devinfo_get(nvdev);
+	if (!ndev_ctx->saved_netvsc_dev_info) {
+		ret = -ENOMEM;
+		goto out;
+	}
+	ret = netvsc_detach(net, nvdev);
+out:
+	rtnl_unlock();
+
+	return ret;
+}
+
+static int netvsc_resume(struct hv_device *dev)
+{
+	struct net_device *net = hv_get_drvdata(dev);
+	struct net_device_context *net_device_ctx;
+	struct netvsc_device_info *device_info;
+	int ret;
+
+	rtnl_lock();
+
+	net_device_ctx = netdev_priv(net);
+
+	/* Reset the data path to the netvsc NIC before re-opening the vmbus
+	 * channel. Later netvsc_netdev_event() will switch the data path to
+	 * the VF upon the UP or CHANGE event.
+	 */
+	net_device_ctx->data_path_is_vf = false;
+	device_info = net_device_ctx->saved_netvsc_dev_info;
+
+	ret = netvsc_attach(net, device_info);
+
+	netvsc_devinfo_put(device_info);
+	net_device_ctx->saved_netvsc_dev_info = NULL;
+
+	rtnl_unlock();
+
+	return ret;
+}
+static const struct hv_vmbus_device_id id_table[] = {
+	/* Network guid */
+	{ HV_NIC_GUID, },
+	{ },
+};
+
+MODULE_DEVICE_TABLE(vmbus, id_table);
+
+/* The one and only one */
+static struct  hv_driver netvsc_drv = {
+	.name = KBUILD_MODNAME,
+	.id_table = id_table,
+	.probe = netvsc_probe,
+	.remove = netvsc_remove,
+	.suspend = netvsc_suspend,
+	.resume = netvsc_resume,
+	.driver = {
+		.probe_type = PROBE_FORCE_SYNCHRONOUS,
+	},
+};
+
+/*
+ * On Hyper-V, every VF interface is matched with a corresponding
+ * synthetic interface. The synthetic interface is presented first
+ * to the guest. When the corresponding VF instance is registered,
+ * we will take care of switching the data path.
+ */
+static int netvsc_netdev_event(struct notifier_block *this,
+			       unsigned long event, void *ptr)
+{
+	struct net_device *event_dev = netdev_notifier_info_to_dev(ptr);
+
+	/* Skip our own events */
+	if (event_dev->netdev_ops == &device_ops)
+		return NOTIFY_DONE;
+
+	/* Avoid non-Ethernet type devices */
+	if (event_dev->type != ARPHRD_ETHER)
+		return NOTIFY_DONE;
+
+	/* Avoid Vlan dev with same MAC registering as VF */
+	if (is_vlan_dev(event_dev))
+		return NOTIFY_DONE;
+
+	/* Avoid Bonding master dev with same MAC registering as VF */
+	if (netif_is_bond_master(event_dev))
+		return NOTIFY_DONE;
+
+	switch (event) {
+	case NETDEV_POST_INIT:
+		return netvsc_prepare_bonding(event_dev);
+	case NETDEV_REGISTER:
+		return netvsc_register_vf(event_dev);
+	case NETDEV_UNREGISTER:
+		return netvsc_unregister_vf(event_dev);
+	case NETDEV_UP:
+	case NETDEV_DOWN:
+	case NETDEV_CHANGE:
+	case NETDEV_GOING_DOWN:
+		return netvsc_vf_changed(event_dev, event);
+	default:
+		return NOTIFY_DONE;
+	}
+}
+
+static struct notifier_block netvsc_netdev_notifier = {
+	.notifier_call = netvsc_netdev_event,
+};
+
+static void __exit netvsc_drv_exit(void)
+{
+	unregister_netdevice_notifier(&netvsc_netdev_notifier);
+	vmbus_driver_unregister(&netvsc_drv);
+}
+
+static int __init netvsc_drv_init(void)
+{
+	int ret;
+
+	if (ring_size < RING_SIZE_MIN) {
+		ring_size = RING_SIZE_MIN;
+		pr_info("Increased ring_size to %u (min allowed)\n",
+			ring_size);
+	}
+	netvsc_ring_bytes = VMBUS_RING_SIZE(ring_size * 4096);
+
+	register_netdevice_notifier(&netvsc_netdev_notifier);
+
+	ret = vmbus_driver_register(&netvsc_drv);
+	if (ret)
+		goto err_vmbus_reg;
+
+	return 0;
+
+err_vmbus_reg:
+	unregister_netdevice_notifier(&netvsc_netdev_notifier);
+	return ret;
+}
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Microsoft Hyper-V network driver");
+
+module_init(netvsc_drv_init);
+module_exit(netvsc_drv_exit);