[PATCHv1 1/7] TAP: Refactoring macvtap.c

[Sainath Grandhi]

macvtap module has code for tap/queue management and link management. This patch splits
the code into macvtap_main.c for link management and tap.c for tap/queue management.
Functionality in tap.c can be re-used for implementing tap on other virtual interfaces.

Signed-off-by: Sainath Grandhi <sainath.grandhi@xxxxxxxxx>
Tested-by: Sainath Grandhi <sainath.grandhi@xxxxxxxxx>
---
 drivers/net/Makefile       |    2 +
 drivers/net/macvtap.c      | 1374 --------------------------------------------
 drivers/net/macvtap_main.c |  218 +++++++
 drivers/net/tap.c          | 1186 ++++++++++++++++++++++++++++++++++++++
 include/linux/if_macvtap.h |   10 +
 5 files changed, 1416 insertions(+), 1374 deletions(-)
 delete mode 100644 drivers/net/macvtap.c
 create mode 100644 drivers/net/macvtap_main.c
 create mode 100644 drivers/net/tap.c
 create mode 100644 include/linux/if_macvtap.h

diff --git a/drivers/net/Makefile b/drivers/net/Makefile
index 7336cbd..19b03a9 100644
--- a/drivers/net/Makefile
+++ b/drivers/net/Makefile
@@ -29,6 +29,8 @@ obj-$(CONFIG_GTP) += gtp.o
 obj-$(CONFIG_NLMON) += nlmon.o
 obj-$(CONFIG_NET_VRF) += vrf.o
 
+macvtap-objs := macvtap_main.o tap.o
+
 #
 # Networking Drivers
 #
diff --git a/drivers/net/macvtap.c b/drivers/net/macvtap.c
deleted file mode 100644
index 5c26653..0000000
--- a/drivers/net/macvtap.c
+++ /dev/null
@@ -1,1374 +0,0 @@
-#include <linux/etherdevice.h>
-#include <linux/if_macvlan.h>
-#include <linux/if_vlan.h>
-#include <linux/interrupt.h>
-#include <linux/nsproxy.h>
-#include <linux/compat.h>
-#include <linux/if_tun.h>
-#include <linux/module.h>
-#include <linux/skbuff.h>
-#include <linux/cache.h>
-#include <linux/sched.h>
-#include <linux/types.h>
-#include <linux/slab.h>
-#include <linux/wait.h>
-#include <linux/cdev.h>
-#include <linux/idr.h>
-#include <linux/fs.h>
-#include <linux/uio.h>
-
-#include <net/net_namespace.h>
-#include <net/rtnetlink.h>
-#include <net/sock.h>
-#include <linux/virtio_net.h>
-#include <linux/skb_array.h>
-
-/*
- * A macvtap queue is the central object of this driver, it connects
- * an open character device to a macvlan interface. There can be
- * multiple queues on one interface, which map back to queues
- * implemented in hardware on the underlying device.
- *
- * macvtap_proto is used to allocate queues through the sock allocation
- * mechanism.
- *
- */
-struct macvtap_queue {
-	struct sock sk;
-	struct socket sock;
-	struct socket_wq wq;
-	int vnet_hdr_sz;
-	struct macvlan_dev __rcu *vlan;
-	struct file *file;
-	unsigned int flags;
-	u16 queue_index;
-	bool enabled;
-	struct list_head next;
-	struct skb_array skb_array;
-};
-
-#define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
-
-#define MACVTAP_VNET_LE 0x80000000
-#define MACVTAP_VNET_BE 0x40000000
-
-#ifdef CONFIG_TUN_VNET_CROSS_LE
-static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
-{
-	return q->flags & MACVTAP_VNET_BE ? false :
-		virtio_legacy_is_little_endian();
-}
-
-static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *sp)
-{
-	int s = !!(q->flags & MACVTAP_VNET_BE);
-
-	if (put_user(s, sp))
-		return -EFAULT;
-
-	return 0;
-}
-
-static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *sp)
-{
-	int s;
-
-	if (get_user(s, sp))
-		return -EFAULT;
-
-	if (s)
-		q->flags |= MACVTAP_VNET_BE;
-	else
-		q->flags &= ~MACVTAP_VNET_BE;
-
-	return 0;
-}
-#else
-static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
-{
-	return virtio_legacy_is_little_endian();
-}
-
-static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *argp)
-{
-	return -EINVAL;
-}
-
-static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *argp)
-{
-	return -EINVAL;
-}
-#endif /* CONFIG_TUN_VNET_CROSS_LE */
-
-static inline bool macvtap_is_little_endian(struct macvtap_queue *q)
-{
-	return q->flags & MACVTAP_VNET_LE ||
-		macvtap_legacy_is_little_endian(q);
-}
-
-static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val)
-{
-	return __virtio16_to_cpu(macvtap_is_little_endian(q), val);
-}
-
-static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val)
-{
-	return __cpu_to_virtio16(macvtap_is_little_endian(q), val);
-}
-
-static struct proto macvtap_proto = {
-	.name = "macvtap",
-	.owner = THIS_MODULE,
-	.obj_size = sizeof (struct macvtap_queue),
-};
-
-/*
- * Variables for dealing with macvtaps device numbers.
- */
-static dev_t macvtap_major;
-#define MACVTAP_NUM_DEVS (1U << MINORBITS)
-static DEFINE_MUTEX(minor_lock);
-static DEFINE_IDR(minor_idr);
-
-#define GOODCOPY_LEN 128
-static const void *macvtap_net_namespace(struct device *d)
-{
-	struct net_device *dev = to_net_dev(d->parent);
-	return dev_net(dev);
-}
-
-static struct class macvtap_class = {
-	.name = "macvtap",
-	.owner = THIS_MODULE,
-	.ns_type = &net_ns_type_operations,
-	.namespace = macvtap_net_namespace,
-};
-static struct cdev macvtap_cdev;
-
-static const struct proto_ops macvtap_socket_ops;
-
-#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
-		      NETIF_F_TSO6 | NETIF_F_UFO)
-#define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
-#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
-
-static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
-{
-	return rcu_dereference(dev->rx_handler_data);
-}
-
-/*
- * RCU usage:
- * The macvtap_queue and the macvlan_dev are loosely coupled, the
- * pointers from one to the other can only be read while rcu_read_lock
- * or rtnl is held.
- *
- * Both the file and the macvlan_dev hold a reference on the macvtap_queue
- * through sock_hold(&q->sk). When the macvlan_dev goes away first,
- * q->vlan becomes inaccessible. When the files gets closed,
- * macvtap_get_queue() fails.
- *
- * There may still be references to the struct sock inside of the
- * queue from outbound SKBs, but these never reference back to the
- * file or the dev. The data structure is freed through __sk_free
- * when both our references and any pending SKBs are gone.
- */
-
-static int macvtap_enable_queue(struct net_device *dev, struct file *file,
-				struct macvtap_queue *q)
-{
-	struct macvlan_dev *vlan = netdev_priv(dev);
-	int err = -EINVAL;
-
-	ASSERT_RTNL();
-
-	if (q->enabled)
-		goto out;
-
-	err = 0;
-	rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
-	q->queue_index = vlan->numvtaps;
-	q->enabled = true;
-
-	vlan->numvtaps++;
-out:
-	return err;
-}
-
-/* Requires RTNL */
-static int macvtap_set_queue(struct net_device *dev, struct file *file,
-			     struct macvtap_queue *q)
-{
-	struct macvlan_dev *vlan = netdev_priv(dev);
-
-	if (vlan->numqueues == MAX_MACVTAP_QUEUES)
-		return -EBUSY;
-
-	rcu_assign_pointer(q->vlan, vlan);
-	rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
-	sock_hold(&q->sk);
-
-	q->file = file;
-	q->queue_index = vlan->numvtaps;
-	q->enabled = true;
-	file->private_data = q;
-	list_add_tail(&q->next, &vlan->queue_list);
-
-	vlan->numvtaps++;
-	vlan->numqueues++;
-
-	return 0;
-}
-
-static int macvtap_disable_queue(struct macvtap_queue *q)
-{
-	struct macvlan_dev *vlan;
-	struct macvtap_queue *nq;
-
-	ASSERT_RTNL();
-	if (!q->enabled)
-		return -EINVAL;
-
-	vlan = rtnl_dereference(q->vlan);
-
-	if (vlan) {
-		int index = q->queue_index;
-		BUG_ON(index >= vlan->numvtaps);
-		nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]);
-		nq->queue_index = index;
-
-		rcu_assign_pointer(vlan->taps[index], nq);
-		RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL);
-		q->enabled = false;
-
-		vlan->numvtaps--;
-	}
-
-	return 0;
-}
-
-/*
- * The file owning the queue got closed, give up both
- * the reference that the files holds as well as the
- * one from the macvlan_dev if that still exists.
- *
- * Using the spinlock makes sure that we don't get
- * to the queue again after destroying it.
- */
-static void macvtap_put_queue(struct macvtap_queue *q)
-{
-	struct macvlan_dev *vlan;
-
-	rtnl_lock();
-	vlan = rtnl_dereference(q->vlan);
-
-	if (vlan) {
-		if (q->enabled)
-			BUG_ON(macvtap_disable_queue(q));
-
-		vlan->numqueues--;
-		RCU_INIT_POINTER(q->vlan, NULL);
-		sock_put(&q->sk);
-		list_del_init(&q->next);
-	}
-
-	rtnl_unlock();
-
-	synchronize_rcu();
-	sock_put(&q->sk);
-}
-
-/*
- * Select a queue based on the rxq of the device on which this packet
- * arrived. If the incoming device is not mq, calculate a flow hash
- * to select a queue. If all fails, find the first available queue.
- * Cache vlan->numvtaps since it can become zero during the execution
- * of this function.
- */
-static struct macvtap_queue *macvtap_get_queue(struct net_device *dev,
-					       struct sk_buff *skb)
-{
-	struct macvlan_dev *vlan = netdev_priv(dev);
-	struct macvtap_queue *tap = NULL;
-	/* Access to taps array is protected by rcu, but access to numvtaps
-	 * isn't. Below we use it to lookup a queue, but treat it as a hint
-	 * and validate that the result isn't NULL - in case we are
-	 * racing against queue removal.
-	 */
-	int numvtaps = ACCESS_ONCE(vlan->numvtaps);
-	__u32 rxq;
-
-	if (!numvtaps)
-		goto out;
-
-	if (numvtaps == 1)
-		goto single;
-
-	/* Check if we can use flow to select a queue */
-	rxq = skb_get_hash(skb);
-	if (rxq) {
-		tap = rcu_dereference(vlan->taps[rxq % numvtaps]);
-		goto out;
-	}
-
-	if (likely(skb_rx_queue_recorded(skb))) {
-		rxq = skb_get_rx_queue(skb);
-
-		while (unlikely(rxq >= numvtaps))
-			rxq -= numvtaps;
-
-		tap = rcu_dereference(vlan->taps[rxq]);
-		goto out;
-	}
-
-single:
-	tap = rcu_dereference(vlan->taps[0]);
-out:
-	return tap;
-}
-
-/*
- * The net_device is going away, give up the reference
- * that it holds on all queues and safely set the pointer
- * from the queues to NULL.
- */
-static void macvtap_del_queues(struct net_device *dev)
-{
-	struct macvlan_dev *vlan = netdev_priv(dev);
-	struct macvtap_queue *q, *tmp;
-
-	ASSERT_RTNL();
-	list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) {
-		list_del_init(&q->next);
-		RCU_INIT_POINTER(q->vlan, NULL);
-		if (q->enabled)
-			vlan->numvtaps--;
-		vlan->numqueues--;
-		sock_put(&q->sk);
-	}
-	BUG_ON(vlan->numvtaps);
-	BUG_ON(vlan->numqueues);
-	/* guarantee that any future macvtap_set_queue will fail */
-	vlan->numvtaps = MAX_MACVTAP_QUEUES;
-}
-
-static rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb)
-{
-	struct sk_buff *skb = *pskb;
-	struct net_device *dev = skb->dev;
-	struct macvlan_dev *vlan;
-	struct macvtap_queue *q;
-	netdev_features_t features = TAP_FEATURES;
-
-	vlan = macvtap_get_vlan_rcu(dev);
-	if (!vlan)
-		return RX_HANDLER_PASS;
-
-	q = macvtap_get_queue(dev, skb);
-	if (!q)
-		return RX_HANDLER_PASS;
-
-	if (__skb_array_full(&q->skb_array))
-		goto drop;
-
-	skb_push(skb, ETH_HLEN);
-
-	/* Apply the forward feature mask so that we perform segmentation
-	 * according to users wishes.  This only works if VNET_HDR is
-	 * enabled.
-	 */
-	if (q->flags & IFF_VNET_HDR)
-		features |= vlan->tap_features;
-	if (netif_needs_gso(skb, features)) {
-		struct sk_buff *segs = __skb_gso_segment(skb, features, false);
-
-		if (IS_ERR(segs))
-			goto drop;
-
-		if (!segs) {
-			if (skb_array_produce(&q->skb_array, skb))
-				goto drop;
-			goto wake_up;
-		}
-
-		consume_skb(skb);
-		while (segs) {
-			struct sk_buff *nskb = segs->next;
-
-			segs->next = NULL;
-			if (skb_array_produce(&q->skb_array, segs)) {
-				kfree_skb(segs);
-				kfree_skb_list(nskb);
-				break;
-			}
-			segs = nskb;
-		}
-	} else {
-		/* If we receive a partial checksum and the tap side
-		 * doesn't support checksum offload, compute the checksum.
-		 * Note: it doesn't matter which checksum feature to
-		 *        check, we either support them all or none.
-		 */
-		if (skb->ip_summed == CHECKSUM_PARTIAL &&
-		    !(features & NETIF_F_CSUM_MASK) &&
-		    skb_checksum_help(skb))
-			goto drop;
-		if (skb_array_produce(&q->skb_array, skb))
-			goto drop;
-	}
-
-wake_up:
-	wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND);
-	return RX_HANDLER_CONSUMED;
-
-drop:
-	/* Count errors/drops only here, thus don't care about args. */
-	macvlan_count_rx(vlan, 0, 0, 0);
-	kfree_skb(skb);
-	return RX_HANDLER_CONSUMED;
-}
-
-static int macvtap_get_minor(struct macvlan_dev *vlan)
-{
-	int retval = -ENOMEM;
-
-	mutex_lock(&minor_lock);
-	retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL);
-	if (retval >= 0) {
-		vlan->minor = retval;
-	} else if (retval == -ENOSPC) {
-		netdev_err(vlan->dev, "Too many macvtap devices\n");
-		retval = -EINVAL;
-	}
-	mutex_unlock(&minor_lock);
-	return retval < 0 ? retval : 0;
-}
-
-static void macvtap_free_minor(struct macvlan_dev *vlan)
-{
-	mutex_lock(&minor_lock);
-	if (vlan->minor) {
-		idr_remove(&minor_idr, vlan->minor);
-		vlan->minor = 0;
-	}
-	mutex_unlock(&minor_lock);
-}
-
-static struct net_device *dev_get_by_macvtap_minor(int minor)
-{
-	struct net_device *dev = NULL;
-	struct macvlan_dev *vlan;
-
-	mutex_lock(&minor_lock);
-	vlan = idr_find(&minor_idr, minor);
-	if (vlan) {
-		dev = vlan->dev;
-		dev_hold(dev);
-	}
-	mutex_unlock(&minor_lock);
-	return dev;
-}
-
-static int macvtap_newlink(struct net *src_net,
-			   struct net_device *dev,
-			   struct nlattr *tb[],
-			   struct nlattr *data[])
-{
-	struct macvlan_dev *vlan = netdev_priv(dev);
-	int err;
-
-	INIT_LIST_HEAD(&vlan->queue_list);
-
-	/* Since macvlan supports all offloads by default, make
-	 * tap support all offloads also.
-	 */
-	vlan->tap_features = TUN_OFFLOADS;
-
-	err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan);
-	if (err)
-		return err;
-
-	/* Don't put anything that may fail after macvlan_common_newlink
-	 * because we can't undo what it does.
-	 */
-	err = macvlan_common_newlink(src_net, dev, tb, data);
-	if (err) {
-		netdev_rx_handler_unregister(dev);
-		return err;
-	}
-
-	return 0;
-}
-
-static void macvtap_dellink(struct net_device *dev,
-			    struct list_head *head)
-{
-	netdev_rx_handler_unregister(dev);
-	macvtap_del_queues(dev);
-	macvlan_dellink(dev, head);
-}
-
-static void macvtap_setup(struct net_device *dev)
-{
-	macvlan_common_setup(dev);
-	dev->tx_queue_len = TUN_READQ_SIZE;
-}
-
-static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
-	.kind		= "macvtap",
-	.setup		= macvtap_setup,
-	.newlink	= macvtap_newlink,
-	.dellink	= macvtap_dellink,
-};
-
-
-static void macvtap_sock_write_space(struct sock *sk)
-{
-	wait_queue_head_t *wqueue;
-
-	if (!sock_writeable(sk) ||
-	    !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags))
-		return;
-
-	wqueue = sk_sleep(sk);
-	if (wqueue && waitqueue_active(wqueue))
-		wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
-}
-
-static void macvtap_sock_destruct(struct sock *sk)
-{
-	struct macvtap_queue *q = container_of(sk, struct macvtap_queue, sk);
-
-	skb_array_cleanup(&q->skb_array);
-}
-
-static int macvtap_open(struct inode *inode, struct file *file)
-{
-	struct net *net = current->nsproxy->net_ns;
-	struct net_device *dev;
-	struct macvtap_queue *q;
-	int err = -ENODEV;
-
-	rtnl_lock();
-	dev = dev_get_by_macvtap_minor(iminor(inode));
-	if (!dev)
-		goto err;
-
-	err = -ENOMEM;
-	q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
-					     &macvtap_proto, 0);
-	if (!q)
-		goto err;
-
-	RCU_INIT_POINTER(q->sock.wq, &q->wq);
-	init_waitqueue_head(&q->wq.wait);
-	q->sock.type = SOCK_RAW;
-	q->sock.state = SS_CONNECTED;
-	q->sock.file = file;
-	q->sock.ops = &macvtap_socket_ops;
-	sock_init_data(&q->sock, &q->sk);
-	q->sk.sk_write_space = macvtap_sock_write_space;
-	q->sk.sk_destruct = macvtap_sock_destruct;
-	q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
-	q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
-
-	/*
-	 * so far only KVM virtio_net uses macvtap, enable zero copy between
-	 * guest kernel and host kernel when lower device supports zerocopy
-	 *
-	 * The macvlan supports zerocopy iff the lower device supports zero
-	 * copy so we don't have to look at the lower device directly.
-	 */
-	if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG))
-		sock_set_flag(&q->sk, SOCK_ZEROCOPY);
-
-	err = -ENOMEM;
-	if (skb_array_init(&q->skb_array, dev->tx_queue_len, GFP_KERNEL))
-		goto err_array;
-
-	err = macvtap_set_queue(dev, file, q);
-	if (err)
-		goto err_queue;
-
-	dev_put(dev);
-
-	rtnl_unlock();
-	return err;
-
-err_queue:
-	skb_array_cleanup(&q->skb_array);
-err_array:
-	sock_put(&q->sk);
-err:
-	if (dev)
-		dev_put(dev);
-
-	rtnl_unlock();
-	return err;
-}
-
-static int macvtap_release(struct inode *inode, struct file *file)
-{
-	struct macvtap_queue *q = file->private_data;
-	macvtap_put_queue(q);
-	return 0;
-}
-
-static unsigned int macvtap_poll(struct file *file, poll_table * wait)
-{
-	struct macvtap_queue *q = file->private_data;
-	unsigned int mask = POLLERR;
-
-	if (!q)
-		goto out;
-
-	mask = 0;
-	poll_wait(file, &q->wq.wait, wait);
-
-	if (!skb_array_empty(&q->skb_array))
-		mask |= POLLIN | POLLRDNORM;
-
-	if (sock_writeable(&q->sk) ||
-	    (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) &&
-	     sock_writeable(&q->sk)))
-		mask |= POLLOUT | POLLWRNORM;
-
-out:
-	return mask;
-}
-
-static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
-						size_t len, size_t linear,
-						int noblock, int *err)
-{
-	struct sk_buff *skb;
-
-	/* Under a page?  Don't bother with paged skb. */
-	if (prepad + len < PAGE_SIZE || !linear)
-		linear = len;
-
-	skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
-				   err, 0);
-	if (!skb)
-		return NULL;
-
-	skb_reserve(skb, prepad);
-	skb_put(skb, linear);
-	skb->data_len = len - linear;
-	skb->len += len - linear;
-
-	return skb;
-}
-
-/* Neighbour code has some assumptions on HH_DATA_MOD alignment */
-#define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN)
-
-/* Get packet from user space buffer */
-static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
-				struct iov_iter *from, int noblock)
-{
-	int good_linear = SKB_MAX_HEAD(MACVTAP_RESERVE);
-	struct sk_buff *skb;
-	struct macvlan_dev *vlan;
-	unsigned long total_len = iov_iter_count(from);
-	unsigned long len = total_len;
-	int err;
-	struct virtio_net_hdr vnet_hdr = { 0 };
-	int vnet_hdr_len = 0;
-	int copylen = 0;
-	int depth;
-	bool zerocopy = false;
-	size_t linear;
-
-	if (q->flags & IFF_VNET_HDR) {
-		vnet_hdr_len = q->vnet_hdr_sz;
-
-		err = -EINVAL;
-		if (len < vnet_hdr_len)
-			goto err;
-		len -= vnet_hdr_len;
-
-		err = -EFAULT;
-		if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from))
-			goto err;
-		iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
-		if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
-		     macvtap16_to_cpu(q, vnet_hdr.csum_start) +
-		     macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
-			     macvtap16_to_cpu(q, vnet_hdr.hdr_len))
-			vnet_hdr.hdr_len = cpu_to_macvtap16(q,
-				 macvtap16_to_cpu(q, vnet_hdr.csum_start) +
-				 macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
-		err = -EINVAL;
-		if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len)
-			goto err;
-	}
-
-	err = -EINVAL;
-	if (unlikely(len < ETH_HLEN))
-		goto err;
-
-	if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
-		struct iov_iter i;
-
-		copylen = vnet_hdr.hdr_len ?
-			macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN;
-		if (copylen > good_linear)
-			copylen = good_linear;
-		else if (copylen < ETH_HLEN)
-			copylen = ETH_HLEN;
-		linear = copylen;
-		i = *from;
-		iov_iter_advance(&i, copylen);
-		if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS)
-			zerocopy = true;
-	}
-
-	if (!zerocopy) {
-		copylen = len;
-		linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len);
-		if (linear > good_linear)
-			linear = good_linear;
-		else if (linear < ETH_HLEN)
-			linear = ETH_HLEN;
-	}
-
-	skb = macvtap_alloc_skb(&q->sk, MACVTAP_RESERVE, copylen,
-				linear, noblock, &err);
-	if (!skb)
-		goto err;
-
-	if (zerocopy)
-		err = zerocopy_sg_from_iter(skb, from);
-	else
-		err = skb_copy_datagram_from_iter(skb, 0, from, len);
-
-	if (err)
-		goto err_kfree;
-
-	skb_set_network_header(skb, ETH_HLEN);
-	skb_reset_mac_header(skb);
-	skb->protocol = eth_hdr(skb)->h_proto;
-
-	if (vnet_hdr_len) {
-		err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
-					    macvtap_is_little_endian(q));
-		if (err)
-			goto err_kfree;
-	}
-
-	skb_probe_transport_header(skb, ETH_HLEN);
-
-	/* Move network header to the right position for VLAN tagged packets */
-	if ((skb->protocol == htons(ETH_P_8021Q) ||
-	     skb->protocol == htons(ETH_P_8021AD)) &&
-	    __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
-		skb_set_network_header(skb, depth);
-
-	rcu_read_lock();
-	vlan = rcu_dereference(q->vlan);
-	/* copy skb_ubuf_info for callback when skb has no error */
-	if (zerocopy) {
-		skb_shinfo(skb)->destructor_arg = m->msg_control;
-		skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
-		skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
-	} else if (m && m->msg_control) {
-		struct ubuf_info *uarg = m->msg_control;
-		uarg->callback(uarg, false);
-	}
-
-	if (vlan) {
-		skb->dev = vlan->dev;
-		dev_queue_xmit(skb);
-	} else {
-		kfree_skb(skb);
-	}
-	rcu_read_unlock();
-
-	return total_len;
-
-err_kfree:
-	kfree_skb(skb);
-
-err:
-	rcu_read_lock();
-	vlan = rcu_dereference(q->vlan);
-	if (vlan)
-		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
-	rcu_read_unlock();
-
-	return err;
-}
-
-static ssize_t macvtap_write_iter(struct kiocb *iocb, struct iov_iter *from)
-{
-	struct file *file = iocb->ki_filp;
-	struct macvtap_queue *q = file->private_data;
-
-	return macvtap_get_user(q, NULL, from, file->f_flags & O_NONBLOCK);
-}
-
-/* Put packet to the user space buffer */
-static ssize_t macvtap_put_user(struct macvtap_queue *q,
-				const struct sk_buff *skb,
-				struct iov_iter *iter)
-{
-	int ret;
-	int vnet_hdr_len = 0;
-	int vlan_offset = 0;
-	int total;
-
-	if (q->flags & IFF_VNET_HDR) {
-		struct virtio_net_hdr vnet_hdr;
-		vnet_hdr_len = q->vnet_hdr_sz;
-		if (iov_iter_count(iter) < vnet_hdr_len)
-			return -EINVAL;
-
-		if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
-					    macvtap_is_little_endian(q)))
-			BUG();
-
-		if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
-		    sizeof(vnet_hdr))
-			return -EFAULT;
-
-		iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
-	}
-	total = vnet_hdr_len;
-	total += skb->len;
-
-	if (skb_vlan_tag_present(skb)) {
-		struct {
-			__be16 h_vlan_proto;
-			__be16 h_vlan_TCI;
-		} veth;
-		veth.h_vlan_proto = skb->vlan_proto;
-		veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
-
-		vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
-		total += VLAN_HLEN;
-
-		ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset);
-		if (ret || !iov_iter_count(iter))
-			goto done;
-
-		ret = copy_to_iter(&veth, sizeof(veth), iter);
-		if (ret != sizeof(veth) || !iov_iter_count(iter))
-			goto done;
-	}
-
-	ret = skb_copy_datagram_iter(skb, vlan_offset, iter,
-				     skb->len - vlan_offset);
-
-done:
-	return ret ? ret : total;
-}
-
-static ssize_t macvtap_do_read(struct macvtap_queue *q,
-			       struct iov_iter *to,
-			       int noblock)
-{
-	DEFINE_WAIT(wait);
-	struct sk_buff *skb;
-	ssize_t ret = 0;
-
-	if (!iov_iter_count(to))
-		return 0;
-
-	while (1) {
-		if (!noblock)
-			prepare_to_wait(sk_sleep(&q->sk), &wait,
-					TASK_INTERRUPTIBLE);
-
-		/* Read frames from the queue */
-		skb = skb_array_consume(&q->skb_array);
-		if (skb)
-			break;
-		if (noblock) {
-			ret = -EAGAIN;
-			break;
-		}
-		if (signal_pending(current)) {
-			ret = -ERESTARTSYS;
-			break;
-		}
-		/* Nothing to read, let's sleep */
-		schedule();
-	}
-	if (!noblock)
-		finish_wait(sk_sleep(&q->sk), &wait);
-
-	if (skb) {
-		ret = macvtap_put_user(q, skb, to);
-		if (unlikely(ret < 0))
-			kfree_skb(skb);
-		else
-			consume_skb(skb);
-	}
-	return ret;
-}
-
-static ssize_t macvtap_read_iter(struct kiocb *iocb, struct iov_iter *to)
-{
-	struct file *file = iocb->ki_filp;
-	struct macvtap_queue *q = file->private_data;
-	ssize_t len = iov_iter_count(to), ret;
-
-	ret = macvtap_do_read(q, to, file->f_flags & O_NONBLOCK);
-	ret = min_t(ssize_t, ret, len);
-	if (ret > 0)
-		iocb->ki_pos = ret;
-	return ret;
-}
-
-static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
-{
-	struct macvlan_dev *vlan;
-
-	ASSERT_RTNL();
-	vlan = rtnl_dereference(q->vlan);
-	if (vlan)
-		dev_hold(vlan->dev);
-
-	return vlan;
-}
-
-static void macvtap_put_vlan(struct macvlan_dev *vlan)
-{
-	dev_put(vlan->dev);
-}
-
-static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags)
-{
-	struct macvtap_queue *q = file->private_data;
-	struct macvlan_dev *vlan;
-	int ret;
-
-	vlan = macvtap_get_vlan(q);
-	if (!vlan)
-		return -EINVAL;
-
-	if (flags & IFF_ATTACH_QUEUE)
-		ret = macvtap_enable_queue(vlan->dev, file, q);
-	else if (flags & IFF_DETACH_QUEUE)
-		ret = macvtap_disable_queue(q);
-	else
-		ret = -EINVAL;
-
-	macvtap_put_vlan(vlan);
-	return ret;
-}
-
-static int set_offload(struct macvtap_queue *q, unsigned long arg)
-{
-	struct macvlan_dev *vlan;
-	netdev_features_t features;
-	netdev_features_t feature_mask = 0;
-
-	vlan = rtnl_dereference(q->vlan);
-	if (!vlan)
-		return -ENOLINK;
-
-	features = vlan->dev->features;
-
-	if (arg & TUN_F_CSUM) {
-		feature_mask = NETIF_F_HW_CSUM;
-
-		if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) {
-			if (arg & TUN_F_TSO_ECN)
-				feature_mask |= NETIF_F_TSO_ECN;
-			if (arg & TUN_F_TSO4)
-				feature_mask |= NETIF_F_TSO;
-			if (arg & TUN_F_TSO6)
-				feature_mask |= NETIF_F_TSO6;
-		}
-
-		if (arg & TUN_F_UFO)
-			feature_mask |= NETIF_F_UFO;
-	}
-
-	/* tun/tap driver inverts the usage for TSO offloads, where
-	 * setting the TSO bit means that the userspace wants to
-	 * accept TSO frames and turning it off means that user space
-	 * does not support TSO.
-	 * For macvtap, we have to invert it to mean the same thing.
-	 * When user space turns off TSO, we turn off GSO/LRO so that
-	 * user-space will not receive TSO frames.
-	 */
-	if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
-		features |= RX_OFFLOADS;
-	else
-		features &= ~RX_OFFLOADS;
-
-	/* tap_features are the same as features on tun/tap and
-	 * reflect user expectations.
-	 */
-	vlan->tap_features = feature_mask;
-	vlan->set_features = features;
-	netdev_update_features(vlan->dev);
-
-	return 0;
-}
-
-/*
- * provide compatibility with generic tun/tap interface
- */
-static long macvtap_ioctl(struct file *file, unsigned int cmd,
-			  unsigned long arg)
-{
-	struct macvtap_queue *q = file->private_data;
-	struct macvlan_dev *vlan;
-	void __user *argp = (void __user *)arg;
-	struct ifreq __user *ifr = argp;
-	unsigned int __user *up = argp;
-	unsigned short u;
-	int __user *sp = argp;
-	struct sockaddr sa;
-	int s;
-	int ret;
-
-	switch (cmd) {
-	case TUNSETIFF:
-		/* ignore the name, just look at flags */
-		if (get_user(u, &ifr->ifr_flags))
-			return -EFAULT;
-
-		ret = 0;
-		if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP))
-			ret = -EINVAL;
-		else
-			q->flags = (q->flags & ~MACVTAP_FEATURES) | u;
-
-		return ret;
-
-	case TUNGETIFF:
-		rtnl_lock();
-		vlan = macvtap_get_vlan(q);
-		if (!vlan) {
-			rtnl_unlock();
-			return -ENOLINK;
-		}
-
-		ret = 0;
-		u = q->flags;
-		if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
-		    put_user(u, &ifr->ifr_flags))
-			ret = -EFAULT;
-		macvtap_put_vlan(vlan);
-		rtnl_unlock();
-		return ret;
-
-	case TUNSETQUEUE:
-		if (get_user(u, &ifr->ifr_flags))
-			return -EFAULT;
-		rtnl_lock();
-		ret = macvtap_ioctl_set_queue(file, u);
-		rtnl_unlock();
-		return ret;
-
-	case TUNGETFEATURES:
-		if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up))
-			return -EFAULT;
-		return 0;
-
-	case TUNSETSNDBUF:
-		if (get_user(s, sp))
-			return -EFAULT;
-
-		q->sk.sk_sndbuf = s;
-		return 0;
-
-	case TUNGETVNETHDRSZ:
-		s = q->vnet_hdr_sz;
-		if (put_user(s, sp))
-			return -EFAULT;
-		return 0;
-
-	case TUNSETVNETHDRSZ:
-		if (get_user(s, sp))
-			return -EFAULT;
-		if (s < (int)sizeof(struct virtio_net_hdr))
-			return -EINVAL;
-
-		q->vnet_hdr_sz = s;
-		return 0;
-
-	case TUNGETVNETLE:
-		s = !!(q->flags & MACVTAP_VNET_LE);
-		if (put_user(s, sp))
-			return -EFAULT;
-		return 0;
-
-	case TUNSETVNETLE:
-		if (get_user(s, sp))
-			return -EFAULT;
-		if (s)
-			q->flags |= MACVTAP_VNET_LE;
-		else
-			q->flags &= ~MACVTAP_VNET_LE;
-		return 0;
-
-	case TUNGETVNETBE:
-		return macvtap_get_vnet_be(q, sp);
-
-	case TUNSETVNETBE:
-		return macvtap_set_vnet_be(q, sp);
-
-	case TUNSETOFFLOAD:
-		/* let the user check for future flags */
-		if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
-			    TUN_F_TSO_ECN | TUN_F_UFO))
-			return -EINVAL;
-
-		rtnl_lock();
-		ret = set_offload(q, arg);
-		rtnl_unlock();
-		return ret;
-
-	case SIOCGIFHWADDR:
-		rtnl_lock();
-		vlan = macvtap_get_vlan(q);
-		if (!vlan) {
-			rtnl_unlock();
-			return -ENOLINK;
-		}
-		ret = 0;
-		u = vlan->dev->type;
-		if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
-		    copy_to_user(&ifr->ifr_hwaddr.sa_data, vlan->dev->dev_addr, ETH_ALEN) ||
-		    put_user(u, &ifr->ifr_hwaddr.sa_family))
-			ret = -EFAULT;
-		macvtap_put_vlan(vlan);
-		rtnl_unlock();
-		return ret;
-
-	case SIOCSIFHWADDR:
-		if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa)))
-			return -EFAULT;
-		rtnl_lock();
-		vlan = macvtap_get_vlan(q);
-		if (!vlan) {
-			rtnl_unlock();
-			return -ENOLINK;
-		}
-		ret = dev_set_mac_address(vlan->dev, &sa);
-		macvtap_put_vlan(vlan);
-		rtnl_unlock();
-		return ret;
-
-	default:
-		return -EINVAL;
-	}
-}
-
-#ifdef CONFIG_COMPAT
-static long macvtap_compat_ioctl(struct file *file, unsigned int cmd,
-				 unsigned long arg)
-{
-	return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
-}
-#endif
-
-static const struct file_operations macvtap_fops = {
-	.owner		= THIS_MODULE,
-	.open		= macvtap_open,
-	.release	= macvtap_release,
-	.read_iter	= macvtap_read_iter,
-	.write_iter	= macvtap_write_iter,
-	.poll		= macvtap_poll,
-	.llseek		= no_llseek,
-	.unlocked_ioctl	= macvtap_ioctl,
-#ifdef CONFIG_COMPAT
-	.compat_ioctl	= macvtap_compat_ioctl,
-#endif
-};
-
-static int macvtap_sendmsg(struct socket *sock, struct msghdr *m,
-			   size_t total_len)
-{
-	struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
-	return macvtap_get_user(q, m, &m->msg_iter, m->msg_flags & MSG_DONTWAIT);
-}
-
-static int macvtap_recvmsg(struct socket *sock, struct msghdr *m,
-			   size_t total_len, int flags)
-{
-	struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
-	int ret;
-	if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
-		return -EINVAL;
-	ret = macvtap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT);
-	if (ret > total_len) {
-		m->msg_flags |= MSG_TRUNC;
-		ret = flags & MSG_TRUNC ? ret : total_len;
-	}
-	return ret;
-}
-
-static int macvtap_peek_len(struct socket *sock)
-{
-	struct macvtap_queue *q = container_of(sock, struct macvtap_queue,
-					       sock);
-	return skb_array_peek_len(&q->skb_array);
-}
-
-/* Ops structure to mimic raw sockets with tun */
-static const struct proto_ops macvtap_socket_ops = {
-	.sendmsg = macvtap_sendmsg,
-	.recvmsg = macvtap_recvmsg,
-	.peek_len = macvtap_peek_len,
-};
-
-/* Get an underlying socket object from tun file.  Returns error unless file is
- * attached to a device.  The returned object works like a packet socket, it
- * can be used for sock_sendmsg/sock_recvmsg.  The caller is responsible for
- * holding a reference to the file for as long as the socket is in use. */
-struct socket *macvtap_get_socket(struct file *file)
-{
-	struct macvtap_queue *q;
-	if (file->f_op != &macvtap_fops)
-		return ERR_PTR(-EINVAL);
-	q = file->private_data;
-	if (!q)
-		return ERR_PTR(-EBADFD);
-	return &q->sock;
-}
-EXPORT_SYMBOL_GPL(macvtap_get_socket);
-
-static int macvtap_queue_resize(struct macvlan_dev *vlan)
-{
-	struct net_device *dev = vlan->dev;
-	struct macvtap_queue *q;
-	struct skb_array **arrays;
-	int n = vlan->numqueues;
-	int ret, i = 0;
-
-	arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL);
-	if (!arrays)
-		return -ENOMEM;
-
-	list_for_each_entry(q, &vlan->queue_list, next)
-		arrays[i++] = &q->skb_array;
-
-	ret = skb_array_resize_multiple(arrays, n,
-					dev->tx_queue_len, GFP_KERNEL);
-
-	kfree(arrays);
-	return ret;
-}
-
-static int macvtap_device_event(struct notifier_block *unused,
-				unsigned long event, void *ptr)
-{
-	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
-	struct macvlan_dev *vlan;
-	struct device *classdev;
-	dev_t devt;
-	int err;
-	char tap_name[IFNAMSIZ];
-
-	if (dev->rtnl_link_ops != &macvtap_link_ops)
-		return NOTIFY_DONE;
-
-	snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
-	vlan = netdev_priv(dev);
-
-	switch (event) {
-	case NETDEV_REGISTER:
-		/* Create the device node here after the network device has
-		 * been registered but before register_netdevice has
-		 * finished running.
-		 */
-		err = macvtap_get_minor(vlan);
-		if (err)
-			return notifier_from_errno(err);
-
-		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
-		classdev = device_create(&macvtap_class, &dev->dev, devt,
-					 dev, tap_name);
-		if (IS_ERR(classdev)) {
-			macvtap_free_minor(vlan);
-			return notifier_from_errno(PTR_ERR(classdev));
-		}
-		err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
-					tap_name);
-		if (err)
-			return notifier_from_errno(err);
-		break;
-	case NETDEV_UNREGISTER:
-		/* vlan->minor == 0 if NETDEV_REGISTER above failed */
-		if (vlan->minor == 0)
-			break;
-		sysfs_remove_link(&dev->dev.kobj, tap_name);
-		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
-		device_destroy(&macvtap_class, devt);
-		macvtap_free_minor(vlan);
-		break;
-	case NETDEV_CHANGE_TX_QUEUE_LEN:
-		if (macvtap_queue_resize(vlan))
-			return NOTIFY_BAD;
-		break;
-	}
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block macvtap_notifier_block __read_mostly = {
-	.notifier_call	= macvtap_device_event,
-};
-
-static int macvtap_init(void)
-{
-	int err;
-
-	err = alloc_chrdev_region(&macvtap_major, 0,
-				MACVTAP_NUM_DEVS, "macvtap");
-	if (err)
-		goto out1;
-
-	cdev_init(&macvtap_cdev, &macvtap_fops);
-	err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS);
-	if (err)
-		goto out2;
-
-	err = class_register(&macvtap_class);
-	if (err)
-		goto out3;
-
-	err = register_netdevice_notifier(&macvtap_notifier_block);
-	if (err)
-		goto out4;
-
-	err = macvlan_link_register(&macvtap_link_ops);
-	if (err)
-		goto out5;
-
-	return 0;
-
-out5:
-	unregister_netdevice_notifier(&macvtap_notifier_block);
-out4:
-	class_unregister(&macvtap_class);
-out3:
-	cdev_del(&macvtap_cdev);
-out2:
-	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
-out1:
-	return err;
-}
-module_init(macvtap_init);
-
-static void macvtap_exit(void)
-{
-	rtnl_link_unregister(&macvtap_link_ops);
-	unregister_netdevice_notifier(&macvtap_notifier_block);
-	class_unregister(&macvtap_class);
-	cdev_del(&macvtap_cdev);
-	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
-	idr_destroy(&minor_idr);
-}
-module_exit(macvtap_exit);
-
-MODULE_ALIAS_RTNL_LINK("macvtap");
-MODULE_AUTHOR("Arnd Bergmann <arnd@xxxxxxxx>");
-MODULE_LICENSE("GPL");
diff --git a/drivers/net/macvtap_main.c b/drivers/net/macvtap_main.c
new file mode 100644
index 0000000..96ffa60
--- /dev/null
+++ b/drivers/net/macvtap_main.c
@@ -0,0 +1,218 @@
+#include <linux/etherdevice.h>
+#include <linux/if_macvlan.h>
+#include <linux/if_macvtap.h>
+#include <linux/if_vlan.h>
+#include <linux/interrupt.h>
+#include <linux/nsproxy.h>
+#include <linux/compat.h>
+#include <linux/if_tun.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/cache.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/cdev.h>
+#include <linux/idr.h>
+#include <linux/fs.h>
+#include <linux/uio.h>
+
+#include <net/net_namespace.h>
+#include <net/rtnetlink.h>
+#include <net/sock.h>
+#include <linux/virtio_net.h>
+#include <linux/skb_array.h>
+
+/*
+ * Variables for dealing with macvtaps device numbers.
+ */
+static dev_t macvtap_major;
+#define MACVTAP_NUM_DEVS (1U << MINORBITS)
+
+static const void *macvtap_net_namespace(struct device *d)
+{
+	struct net_device *dev = to_net_dev(d->parent);
+	return dev_net(dev);
+}
+
+static struct class macvtap_class = {
+	.name = "macvtap",
+	.owner = THIS_MODULE,
+	.ns_type = &net_ns_type_operations,
+	.namespace = macvtap_net_namespace,
+};
+static struct cdev macvtap_cdev;
+
+#define TUN_OFFLOADS (NETIF_F_HW_CSUM | NETIF_F_TSO_ECN | NETIF_F_TSO | \
+		      NETIF_F_TSO6 | NETIF_F_UFO)
+
+static int macvtap_newlink(struct net *src_net,
+			   struct net_device *dev,
+			   struct nlattr *tb[],
+			   struct nlattr *data[])
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	int err;
+
+	INIT_LIST_HEAD(&vlan->queue_list);
+
+	/* Since macvlan supports all offloads by default, make
+	 * tap support all offloads also.
+	 */
+	vlan->tap_features = TUN_OFFLOADS;
+
+	err = netdev_rx_handler_register(dev, macvtap_handle_frame, vlan);
+	if (err)
+		return err;
+
+	/* Don't put anything that may fail after macvlan_common_newlink
+	 * because we can't undo what it does.
+	 */
+	err = macvlan_common_newlink(src_net, dev, tb, data);
+	if (err) {
+		netdev_rx_handler_unregister(dev);
+		return err;
+	}
+
+	return 0;
+}
+
+static void macvtap_dellink(struct net_device *dev,
+			    struct list_head *head)
+{
+	netdev_rx_handler_unregister(dev);
+	macvtap_del_queues(dev);
+	macvlan_dellink(dev, head);
+}
+
+static void macvtap_setup(struct net_device *dev)
+{
+	macvlan_common_setup(dev);
+	dev->tx_queue_len = TUN_READQ_SIZE;
+}
+
+static struct rtnl_link_ops macvtap_link_ops __read_mostly = {
+	.kind		= "macvtap",
+	.setup		= macvtap_setup,
+	.newlink	= macvtap_newlink,
+	.dellink	= macvtap_dellink,
+};
+
+static int macvtap_device_event(struct notifier_block *unused,
+				unsigned long event, void *ptr)
+{
+	struct net_device *dev = netdev_notifier_info_to_dev(ptr);
+	struct macvlan_dev *vlan;
+	struct device *classdev;
+	dev_t devt;
+	int err;
+	char tap_name[IFNAMSIZ];
+
+	if (dev->rtnl_link_ops != &macvtap_link_ops)
+		return NOTIFY_DONE;
+
+	snprintf(tap_name, IFNAMSIZ, "tap%d", dev->ifindex);
+	vlan = netdev_priv(dev);
+
+	switch (event) {
+	case NETDEV_REGISTER:
+		/* Create the device node here after the network device has
+		 * been registered but before register_netdevice has
+		 * finished running.
+		 */
+		err = macvtap_get_minor(vlan);
+		if (err)
+			return notifier_from_errno(err);
+
+		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
+		classdev = device_create(&macvtap_class, &dev->dev, devt,
+					 dev, tap_name);
+		if (IS_ERR(classdev)) {
+			macvtap_free_minor(vlan);
+			return notifier_from_errno(PTR_ERR(classdev));
+		}
+		err = sysfs_create_link(&dev->dev.kobj, &classdev->kobj,
+					tap_name);
+		if (err)
+			return notifier_from_errno(err);
+		break;
+	case NETDEV_UNREGISTER:
+		/* vlan->minor == 0 if NETDEV_REGISTER above failed */
+		if (vlan->minor == 0)
+			break;
+		sysfs_remove_link(&dev->dev.kobj, tap_name);
+		devt = MKDEV(MAJOR(macvtap_major), vlan->minor);
+		device_destroy(&macvtap_class, devt);
+		macvtap_free_minor(vlan);
+		break;
+	case NETDEV_CHANGE_TX_QUEUE_LEN:
+		if (macvtap_queue_resize(vlan))
+			return NOTIFY_BAD;
+		break;
+	}
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block macvtap_notifier_block __read_mostly = {
+	.notifier_call	= macvtap_device_event,
+};
+
+extern struct file_operations macvtap_fops;
+static int macvtap_init(void)
+{
+	int err;
+
+	err = alloc_chrdev_region(&macvtap_major, 0,
+				MACVTAP_NUM_DEVS, "macvtap");
+	if (err)
+		goto out1;
+
+	cdev_init(&macvtap_cdev, &macvtap_fops);
+	err = cdev_add(&macvtap_cdev, macvtap_major, MACVTAP_NUM_DEVS);
+	if (err)
+		goto out2;
+
+	err = class_register(&macvtap_class);
+	if (err)
+		goto out3;
+
+	err = register_netdevice_notifier(&macvtap_notifier_block);
+	if (err)
+		goto out4;
+
+	err = macvlan_link_register(&macvtap_link_ops);
+	if (err)
+		goto out5;
+
+	return 0;
+
+out5:
+	unregister_netdevice_notifier(&macvtap_notifier_block);
+out4:
+	class_unregister(&macvtap_class);
+out3:
+	cdev_del(&macvtap_cdev);
+out2:
+	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
+out1:
+	return err;
+}
+module_init(macvtap_init);
+
+extern struct idr minor_idr;
+static void macvtap_exit(void)
+{
+	rtnl_link_unregister(&macvtap_link_ops);
+	unregister_netdevice_notifier(&macvtap_notifier_block);
+	class_unregister(&macvtap_class);
+	cdev_del(&macvtap_cdev);
+	unregister_chrdev_region(macvtap_major, MACVTAP_NUM_DEVS);
+	idr_destroy(&minor_idr);
+}
+module_exit(macvtap_exit);
+
+MODULE_ALIAS_RTNL_LINK("macvtap");
+MODULE_AUTHOR("Arnd Bergmann <arnd@xxxxxxxx>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/net/tap.c b/drivers/net/tap.c
new file mode 100644
index 0000000..8f12a39
--- /dev/null
+++ b/drivers/net/tap.c
@@ -0,0 +1,1186 @@
+#include <linux/etherdevice.h>
+#include <linux/if_macvlan.h>
+#include <linux/if_vlan.h>
+#include <linux/interrupt.h>
+#include <linux/nsproxy.h>
+#include <linux/compat.h>
+#include <linux/if_tun.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/cache.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+#include <linux/wait.h>
+#include <linux/cdev.h>
+#include <linux/idr.h>
+#include <linux/fs.h>
+#include <linux/uio.h>
+
+#include <net/net_namespace.h>
+#include <net/rtnetlink.h>
+#include <net/sock.h>
+#include <linux/virtio_net.h>
+#include <linux/skb_array.h>
+
+/*
+ * A macvtap queue is the central object of this driver, it connects
+ * an open character device to a macvlan interface. There can be
+ * multiple queues on one interface, which map back to queues
+ * implemented in hardware on the underlying device.
+ *
+ * macvtap_proto is used to allocate queues through the sock allocation
+ * mechanism.
+ *
+ */
+struct macvtap_queue {
+	struct sock sk;
+	struct socket sock;
+	struct socket_wq wq;
+	int vnet_hdr_sz;
+	struct macvlan_dev __rcu *vlan;
+	struct file *file;
+	unsigned int flags;
+	u16 queue_index;
+	bool enabled;
+	struct list_head next;
+	struct skb_array skb_array;
+};
+
+#define MACVTAP_FEATURES (IFF_VNET_HDR | IFF_MULTI_QUEUE)
+
+#define MACVTAP_VNET_LE 0x80000000
+#define MACVTAP_VNET_BE 0x40000000
+
+#ifdef CONFIG_TUN_VNET_CROSS_LE
+static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
+{
+	return q->flags & MACVTAP_VNET_BE ? false :
+		virtio_legacy_is_little_endian();
+}
+
+static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *sp)
+{
+	int s = !!(q->flags & MACVTAP_VNET_BE);
+
+	if (put_user(s, sp))
+		return -EFAULT;
+
+	return 0;
+}
+
+static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *sp)
+{
+	int s;
+
+	if (get_user(s, sp))
+		return -EFAULT;
+
+	if (s)
+		q->flags |= MACVTAP_VNET_BE;
+	else
+		q->flags &= ~MACVTAP_VNET_BE;
+
+	return 0;
+}
+#else
+static inline bool macvtap_legacy_is_little_endian(struct macvtap_queue *q)
+{
+	return virtio_legacy_is_little_endian();
+}
+
+static long macvtap_get_vnet_be(struct macvtap_queue *q, int __user *argp)
+{
+	return -EINVAL;
+}
+
+static long macvtap_set_vnet_be(struct macvtap_queue *q, int __user *argp)
+{
+	return -EINVAL;
+}
+#endif /* CONFIG_TUN_VNET_CROSS_LE */
+
+static inline bool macvtap_is_little_endian(struct macvtap_queue *q)
+{
+	return q->flags & MACVTAP_VNET_LE ||
+		macvtap_legacy_is_little_endian(q);
+}
+
+static inline u16 macvtap16_to_cpu(struct macvtap_queue *q, __virtio16 val)
+{
+	return __virtio16_to_cpu(macvtap_is_little_endian(q), val);
+}
+
+static inline __virtio16 cpu_to_macvtap16(struct macvtap_queue *q, u16 val)
+{
+	return __cpu_to_virtio16(macvtap_is_little_endian(q), val);
+}
+
+static struct proto macvtap_proto = {
+	.name = "macvtap",
+	.owner = THIS_MODULE,
+	.obj_size = sizeof (struct macvtap_queue),
+};
+
+#define MACVTAP_NUM_DEVS (1U << MINORBITS)
+static DEFINE_MUTEX(minor_lock);
+DEFINE_IDR(minor_idr);
+
+#define GOODCOPY_LEN 128
+
+static const struct proto_ops macvtap_socket_ops;
+
+#define RX_OFFLOADS (NETIF_F_GRO | NETIF_F_LRO)
+#define TAP_FEATURES (NETIF_F_GSO | NETIF_F_SG | NETIF_F_FRAGLIST)
+
+static struct macvlan_dev *macvtap_get_vlan_rcu(const struct net_device *dev)
+{
+	return rcu_dereference(dev->rx_handler_data);
+}
+
+/*
+ * RCU usage:
+ * The macvtap_queue and the macvlan_dev are loosely coupled, the
+ * pointers from one to the other can only be read while rcu_read_lock
+ * or rtnl is held.
+ *
+ * Both the file and the macvlan_dev hold a reference on the macvtap_queue
+ * through sock_hold(&q->sk). When the macvlan_dev goes away first,
+ * q->vlan becomes inaccessible. When the files gets closed,
+ * macvtap_get_queue() fails.
+ *
+ * There may still be references to the struct sock inside of the
+ * queue from outbound SKBs, but these never reference back to the
+ * file or the dev. The data structure is freed through __sk_free
+ * when both our references and any pending SKBs are gone.
+ */
+
+static int macvtap_enable_queue(struct net_device *dev, struct file *file,
+				struct macvtap_queue *q)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	int err = -EINVAL;
+
+	ASSERT_RTNL();
+
+	if (q->enabled)
+		goto out;
+
+	err = 0;
+	rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
+	q->queue_index = vlan->numvtaps;
+	q->enabled = true;
+
+	vlan->numvtaps++;
+out:
+	return err;
+}
+
+/* Requires RTNL */
+static int macvtap_set_queue(struct net_device *dev, struct file *file,
+			     struct macvtap_queue *q)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+
+	if (vlan->numqueues == MAX_MACVTAP_QUEUES)
+		return -EBUSY;
+
+	rcu_assign_pointer(q->vlan, vlan);
+	rcu_assign_pointer(vlan->taps[vlan->numvtaps], q);
+	sock_hold(&q->sk);
+
+	q->file = file;
+	q->queue_index = vlan->numvtaps;
+	q->enabled = true;
+	file->private_data = q;
+	list_add_tail(&q->next, &vlan->queue_list);
+
+	vlan->numvtaps++;
+	vlan->numqueues++;
+
+	return 0;
+}
+
+static int macvtap_disable_queue(struct macvtap_queue *q)
+{
+	struct macvlan_dev *vlan;
+	struct macvtap_queue *nq;
+
+	ASSERT_RTNL();
+	if (!q->enabled)
+		return -EINVAL;
+
+	vlan = rtnl_dereference(q->vlan);
+
+	if (vlan) {
+		int index = q->queue_index;
+		BUG_ON(index >= vlan->numvtaps);
+		nq = rtnl_dereference(vlan->taps[vlan->numvtaps - 1]);
+		nq->queue_index = index;
+
+		rcu_assign_pointer(vlan->taps[index], nq);
+		RCU_INIT_POINTER(vlan->taps[vlan->numvtaps - 1], NULL);
+		q->enabled = false;
+
+		vlan->numvtaps--;
+	}
+
+	return 0;
+}
+
+/*
+ * The file owning the queue got closed, give up both
+ * the reference that the files holds as well as the
+ * one from the macvlan_dev if that still exists.
+ *
+ * Using the spinlock makes sure that we don't get
+ * to the queue again after destroying it.
+ */
+static void macvtap_put_queue(struct macvtap_queue *q)
+{
+	struct macvlan_dev *vlan;
+
+	rtnl_lock();
+	vlan = rtnl_dereference(q->vlan);
+
+	if (vlan) {
+		if (q->enabled)
+			BUG_ON(macvtap_disable_queue(q));
+
+		vlan->numqueues--;
+		RCU_INIT_POINTER(q->vlan, NULL);
+		sock_put(&q->sk);
+		list_del_init(&q->next);
+	}
+
+	rtnl_unlock();
+
+	synchronize_rcu();
+	sock_put(&q->sk);
+}
+
+/*
+ * Select a queue based on the rxq of the device on which this packet
+ * arrived. If the incoming device is not mq, calculate a flow hash
+ * to select a queue. If all fails, find the first available queue.
+ * Cache vlan->numvtaps since it can become zero during the execution
+ * of this function.
+ */
+static struct macvtap_queue *macvtap_get_queue(struct net_device *dev,
+					       struct sk_buff *skb)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvtap_queue *tap = NULL;
+	/* Access to taps array is protected by rcu, but access to numvtaps
+	 * isn't. Below we use it to lookup a queue, but treat it as a hint
+	 * and validate that the result isn't NULL - in case we are
+	 * racing against queue removal.
+	 */
+	int numvtaps = ACCESS_ONCE(vlan->numvtaps);
+	__u32 rxq;
+
+	if (!numvtaps)
+		goto out;
+
+	if (numvtaps == 1)
+		goto single;
+
+	/* Check if we can use flow to select a queue */
+	rxq = skb_get_hash(skb);
+	if (rxq) {
+		tap = rcu_dereference(vlan->taps[rxq % numvtaps]);
+		goto out;
+	}
+
+	if (likely(skb_rx_queue_recorded(skb))) {
+		rxq = skb_get_rx_queue(skb);
+
+		while (unlikely(rxq >= numvtaps))
+			rxq -= numvtaps;
+
+		tap = rcu_dereference(vlan->taps[rxq]);
+		goto out;
+	}
+
+single:
+	tap = rcu_dereference(vlan->taps[0]);
+out:
+	return tap;
+}
+
+/*
+ * The net_device is going away, give up the reference
+ * that it holds on all queues and safely set the pointer
+ * from the queues to NULL.
+ */
+void macvtap_del_queues(struct net_device *dev)
+{
+	struct macvlan_dev *vlan = netdev_priv(dev);
+	struct macvtap_queue *q, *tmp;
+
+	ASSERT_RTNL();
+	list_for_each_entry_safe(q, tmp, &vlan->queue_list, next) {
+		list_del_init(&q->next);
+		RCU_INIT_POINTER(q->vlan, NULL);
+		if (q->enabled)
+			vlan->numvtaps--;
+		vlan->numqueues--;
+		sock_put(&q->sk);
+	}
+	BUG_ON(vlan->numvtaps);
+	BUG_ON(vlan->numqueues);
+	/* guarantee that any future macvtap_set_queue will fail */
+	vlan->numvtaps = MAX_MACVTAP_QUEUES;
+}
+
+rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb)
+{
+	struct sk_buff *skb = *pskb;
+	struct net_device *dev = skb->dev;
+	struct macvlan_dev *vlan;
+	struct macvtap_queue *q;
+	netdev_features_t features = TAP_FEATURES;
+
+	vlan = macvtap_get_vlan_rcu(dev);
+	if (!vlan)
+		return RX_HANDLER_PASS;
+
+	q = macvtap_get_queue(dev, skb);
+	if (!q)
+		return RX_HANDLER_PASS;
+
+	if (__skb_array_full(&q->skb_array))
+		goto drop;
+
+	skb_push(skb, ETH_HLEN);
+
+	/* Apply the forward feature mask so that we perform segmentation
+	 * according to users wishes.  This only works if VNET_HDR is
+	 * enabled.
+	 */
+	if (q->flags & IFF_VNET_HDR)
+		features |= vlan->tap_features;
+	if (netif_needs_gso(skb, features)) {
+		struct sk_buff *segs = __skb_gso_segment(skb, features, false);
+
+		if (IS_ERR(segs))
+			goto drop;
+
+		if (!segs) {
+			if (skb_array_produce(&q->skb_array, skb))
+				goto drop;
+			goto wake_up;
+		}
+
+		consume_skb(skb);
+		while (segs) {
+			struct sk_buff *nskb = segs->next;
+
+			segs->next = NULL;
+			if (skb_array_produce(&q->skb_array, segs)) {
+				kfree_skb(segs);
+				kfree_skb_list(nskb);
+				break;
+			}
+			segs = nskb;
+		}
+	} else {
+		/* If we receive a partial checksum and the tap side
+		 * doesn't support checksum offload, compute the checksum.
+		 * Note: it doesn't matter which checksum feature to
+		 *	  check, we either support them all or none.
+		 */
+		if (skb->ip_summed == CHECKSUM_PARTIAL &&
+		    !(features & NETIF_F_CSUM_MASK) &&
+		    skb_checksum_help(skb))
+			goto drop;
+		if (skb_array_produce(&q->skb_array, skb))
+			goto drop;
+	}
+
+wake_up:
+	wake_up_interruptible_poll(sk_sleep(&q->sk), POLLIN | POLLRDNORM | POLLRDBAND);
+	return RX_HANDLER_CONSUMED;
+
+drop:
+	/* Count errors/drops only here, thus don't care about args. */
+	macvlan_count_rx(vlan, 0, 0, 0);
+	kfree_skb(skb);
+	return RX_HANDLER_CONSUMED;
+}
+
+int macvtap_get_minor(struct macvlan_dev *vlan)
+{
+	int retval = -ENOMEM;
+
+	mutex_lock(&minor_lock);
+	retval = idr_alloc(&minor_idr, vlan, 1, MACVTAP_NUM_DEVS, GFP_KERNEL);
+	if (retval >= 0) {
+		vlan->minor = retval;
+	} else if (retval == -ENOSPC) {
+		netdev_err(vlan->dev, "Too many macvtap devices\n");
+		retval = -EINVAL;
+	}
+	mutex_unlock(&minor_lock);
+	return retval < 0 ? retval : 0;
+}
+
+void macvtap_free_minor(struct macvlan_dev *vlan)
+{
+	mutex_lock(&minor_lock);
+	if (vlan->minor) {
+		idr_remove(&minor_idr, vlan->minor);
+		vlan->minor = 0;
+	}
+	mutex_unlock(&minor_lock);
+}
+
+static struct net_device *dev_get_by_macvtap_minor(int minor)
+{
+	struct net_device *dev = NULL;
+	struct macvlan_dev *vlan;
+
+	mutex_lock(&minor_lock);
+	vlan = idr_find(&minor_idr, minor);
+	if (vlan) {
+		dev = vlan->dev;
+		dev_hold(dev);
+	}
+	mutex_unlock(&minor_lock);
+	return dev;
+}
+
+static void macvtap_sock_write_space(struct sock *sk)
+{
+	wait_queue_head_t *wqueue;
+
+	if (!sock_writeable(sk) ||
+	    !test_and_clear_bit(SOCKWQ_ASYNC_NOSPACE, &sk->sk_socket->flags))
+		return;
+
+	wqueue = sk_sleep(sk);
+	if (wqueue && waitqueue_active(wqueue))
+		wake_up_interruptible_poll(wqueue, POLLOUT | POLLWRNORM | POLLWRBAND);
+}
+
+static void macvtap_sock_destruct(struct sock *sk)
+{
+	struct macvtap_queue *q = container_of(sk, struct macvtap_queue, sk);
+
+	skb_array_cleanup(&q->skb_array);
+}
+
+static int macvtap_open(struct inode *inode, struct file *file)
+{
+	struct net *net = current->nsproxy->net_ns;
+	struct net_device *dev;
+	struct macvtap_queue *q;
+	int err = -ENODEV;
+
+	rtnl_lock();
+	dev = dev_get_by_macvtap_minor(iminor(inode));
+	if (!dev)
+		goto err;
+
+	err = -ENOMEM;
+	q = (struct macvtap_queue *)sk_alloc(net, AF_UNSPEC, GFP_KERNEL,
+					     &macvtap_proto, 0);
+	if (!q)
+		goto err;
+
+	RCU_INIT_POINTER(q->sock.wq, &q->wq);
+	init_waitqueue_head(&q->wq.wait);
+	q->sock.type = SOCK_RAW;
+	q->sock.state = SS_CONNECTED;
+	q->sock.file = file;
+	q->sock.ops = &macvtap_socket_ops;
+	sock_init_data(&q->sock, &q->sk);
+	q->sk.sk_write_space = macvtap_sock_write_space;
+	q->sk.sk_destruct = macvtap_sock_destruct;
+	q->flags = IFF_VNET_HDR | IFF_NO_PI | IFF_TAP;
+	q->vnet_hdr_sz = sizeof(struct virtio_net_hdr);
+
+	/*
+	 * so far only KVM virtio_net uses macvtap, enable zero copy between
+	 * guest kernel and host kernel when lower device supports zerocopy
+	 *
+	 * The macvlan supports zerocopy iff the lower device supports zero
+	 * copy so we don't have to look at the lower device directly.
+	 */
+	if ((dev->features & NETIF_F_HIGHDMA) && (dev->features & NETIF_F_SG))
+		sock_set_flag(&q->sk, SOCK_ZEROCOPY);
+
+	err = -ENOMEM;
+	if (skb_array_init(&q->skb_array, dev->tx_queue_len, GFP_KERNEL))
+		goto err_array;
+
+	err = macvtap_set_queue(dev, file, q);
+	if (err)
+		goto err_queue;
+
+	dev_put(dev);
+
+	rtnl_unlock();
+	return err;
+
+err_queue:
+	skb_array_cleanup(&q->skb_array);
+err_array:
+	sock_put(&q->sk);
+err:
+	if (dev)
+		dev_put(dev);
+
+	rtnl_unlock();
+	return err;
+}
+
+static int macvtap_release(struct inode *inode, struct file *file)
+{
+	struct macvtap_queue *q = file->private_data;
+	macvtap_put_queue(q);
+	return 0;
+}
+
+static unsigned int macvtap_poll(struct file *file, poll_table * wait)
+{
+	struct macvtap_queue *q = file->private_data;
+	unsigned int mask = POLLERR;
+
+	if (!q)
+		goto out;
+
+	mask = 0;
+	poll_wait(file, &q->wq.wait, wait);
+
+	if (!skb_array_empty(&q->skb_array))
+		mask |= POLLIN | POLLRDNORM;
+
+	if (sock_writeable(&q->sk) ||
+	    (!test_and_set_bit(SOCKWQ_ASYNC_NOSPACE, &q->sock.flags) &&
+	     sock_writeable(&q->sk)))
+		mask |= POLLOUT | POLLWRNORM;
+
+out:
+	return mask;
+}
+
+static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad,
+						size_t len, size_t linear,
+						int noblock, int *err)
+{
+	struct sk_buff *skb;
+
+	/* Under a page?  Don't bother with paged skb. */
+	if (prepad + len < PAGE_SIZE || !linear)
+		linear = len;
+
+	skb = sock_alloc_send_pskb(sk, prepad + linear, len - linear, noblock,
+				   err, 0);
+	if (!skb)
+		return NULL;
+
+	skb_reserve(skb, prepad);
+	skb_put(skb, linear);
+	skb->data_len = len - linear;
+	skb->len += len - linear;
+
+	return skb;
+}
+
+/* Neighbour code has some assumptions on HH_DATA_MOD alignment */
+#define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN)
+
+/* Get packet from user space buffer */
+static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m,
+				struct iov_iter *from, int noblock)
+{
+	int good_linear = SKB_MAX_HEAD(MACVTAP_RESERVE);
+	struct sk_buff *skb;
+	struct macvlan_dev *vlan;
+	unsigned long total_len = iov_iter_count(from);
+	unsigned long len = total_len;
+	int err;
+	struct virtio_net_hdr vnet_hdr = { 0 };
+	int vnet_hdr_len = 0;
+	int copylen = 0;
+	int depth;
+	bool zerocopy = false;
+	size_t linear;
+
+	if (q->flags & IFF_VNET_HDR) {
+		vnet_hdr_len = q->vnet_hdr_sz;
+
+		err = -EINVAL;
+		if (len < vnet_hdr_len)
+			goto err;
+		len -= vnet_hdr_len;
+
+		err = -EFAULT;
+		if (!copy_from_iter_full(&vnet_hdr, sizeof(vnet_hdr), from))
+			goto err;
+		iov_iter_advance(from, vnet_hdr_len - sizeof(vnet_hdr));
+		if ((vnet_hdr.flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) &&
+		     macvtap16_to_cpu(q, vnet_hdr.csum_start) +
+		     macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2 >
+			     macvtap16_to_cpu(q, vnet_hdr.hdr_len))
+			vnet_hdr.hdr_len = cpu_to_macvtap16(q,
+				 macvtap16_to_cpu(q, vnet_hdr.csum_start) +
+				 macvtap16_to_cpu(q, vnet_hdr.csum_offset) + 2);
+		err = -EINVAL;
+		if (macvtap16_to_cpu(q, vnet_hdr.hdr_len) > len)
+			goto err;
+	}
+
+	err = -EINVAL;
+	if (unlikely(len < ETH_HLEN))
+		goto err;
+
+	if (m && m->msg_control && sock_flag(&q->sk, SOCK_ZEROCOPY)) {
+		struct iov_iter i;
+
+		copylen = vnet_hdr.hdr_len ?
+			macvtap16_to_cpu(q, vnet_hdr.hdr_len) : GOODCOPY_LEN;
+		if (copylen > good_linear)
+			copylen = good_linear;
+		else if (copylen < ETH_HLEN)
+			copylen = ETH_HLEN;
+		linear = copylen;
+		i = *from;
+		iov_iter_advance(&i, copylen);
+		if (iov_iter_npages(&i, INT_MAX) <= MAX_SKB_FRAGS)
+			zerocopy = true;
+	}
+
+	if (!zerocopy) {
+		copylen = len;
+		linear = macvtap16_to_cpu(q, vnet_hdr.hdr_len);
+		if (linear > good_linear)
+			linear = good_linear;
+		else if (linear < ETH_HLEN)
+			linear = ETH_HLEN;
+	}
+
+	skb = macvtap_alloc_skb(&q->sk, MACVTAP_RESERVE, copylen,
+				linear, noblock, &err);
+	if (!skb)
+		goto err;
+
+	if (zerocopy)
+		err = zerocopy_sg_from_iter(skb, from);
+	else
+		err = skb_copy_datagram_from_iter(skb, 0, from, len);
+
+	if (err)
+		goto err_kfree;
+
+	skb_set_network_header(skb, ETH_HLEN);
+	skb_reset_mac_header(skb);
+	skb->protocol = eth_hdr(skb)->h_proto;
+
+	if (vnet_hdr_len) {
+		err = virtio_net_hdr_to_skb(skb, &vnet_hdr,
+					    macvtap_is_little_endian(q));
+		if (err)
+			goto err_kfree;
+	}
+
+	skb_probe_transport_header(skb, ETH_HLEN);
+
+	/* Move network header to the right position for VLAN tagged packets */
+	if ((skb->protocol == htons(ETH_P_8021Q) ||
+	     skb->protocol == htons(ETH_P_8021AD)) &&
+	    __vlan_get_protocol(skb, skb->protocol, &depth) != 0)
+		skb_set_network_header(skb, depth);
+
+	rcu_read_lock();
+	vlan = rcu_dereference(q->vlan);
+	/* copy skb_ubuf_info for callback when skb has no error */
+	if (zerocopy) {
+		skb_shinfo(skb)->destructor_arg = m->msg_control;
+		skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
+		skb_shinfo(skb)->tx_flags |= SKBTX_SHARED_FRAG;
+	} else if (m && m->msg_control) {
+		struct ubuf_info *uarg = m->msg_control;
+		uarg->callback(uarg, false);
+	}
+
+	if (vlan) {
+		skb->dev = vlan->dev;
+		dev_queue_xmit(skb);
+	} else {
+		kfree_skb(skb);
+	}
+	rcu_read_unlock();
+
+	return total_len;
+
+err_kfree:
+	kfree_skb(skb);
+
+err:
+	rcu_read_lock();
+	vlan = rcu_dereference(q->vlan);
+	if (vlan)
+		this_cpu_inc(vlan->pcpu_stats->tx_dropped);
+	rcu_read_unlock();
+
+	return err;
+}
+
+static ssize_t macvtap_write_iter(struct kiocb *iocb, struct iov_iter *from)
+{
+	struct file *file = iocb->ki_filp;
+	struct macvtap_queue *q = file->private_data;
+
+	return macvtap_get_user(q, NULL, from, file->f_flags & O_NONBLOCK);
+}
+
+/* Put packet to the user space buffer */
+static ssize_t macvtap_put_user(struct macvtap_queue *q,
+				const struct sk_buff *skb,
+				struct iov_iter *iter)
+{
+	int ret;
+	int vnet_hdr_len = 0;
+	int vlan_offset = 0;
+	int total;
+
+	if (q->flags & IFF_VNET_HDR) {
+		struct virtio_net_hdr vnet_hdr;
+		vnet_hdr_len = q->vnet_hdr_sz;
+		if (iov_iter_count(iter) < vnet_hdr_len)
+			return -EINVAL;
+
+		if (virtio_net_hdr_from_skb(skb, &vnet_hdr,
+					    macvtap_is_little_endian(q)))
+			BUG();
+
+		if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=
+		    sizeof(vnet_hdr))
+			return -EFAULT;
+
+		iov_iter_advance(iter, vnet_hdr_len - sizeof(vnet_hdr));
+	}
+	total = vnet_hdr_len;
+	total += skb->len;
+
+	if (skb_vlan_tag_present(skb)) {
+		struct {
+			__be16 h_vlan_proto;
+			__be16 h_vlan_TCI;
+		} veth;
+		veth.h_vlan_proto = skb->vlan_proto;
+		veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
+
+		vlan_offset = offsetof(struct vlan_ethhdr, h_vlan_proto);
+		total += VLAN_HLEN;
+
+		ret = skb_copy_datagram_iter(skb, 0, iter, vlan_offset);
+		if (ret || !iov_iter_count(iter))
+			goto done;
+
+		ret = copy_to_iter(&veth, sizeof(veth), iter);
+		if (ret != sizeof(veth) || !iov_iter_count(iter))
+			goto done;
+	}
+
+	ret = skb_copy_datagram_iter(skb, vlan_offset, iter,
+				     skb->len - vlan_offset);
+
+done:
+	return ret ? ret : total;
+}
+
+static ssize_t macvtap_do_read(struct macvtap_queue *q,
+			       struct iov_iter *to,
+			       int noblock)
+{
+	DEFINE_WAIT(wait);
+	struct sk_buff *skb;
+	ssize_t ret = 0;
+
+	if (!iov_iter_count(to))
+		return 0;
+
+	while (1) {
+		if (!noblock)
+			prepare_to_wait(sk_sleep(&q->sk), &wait,
+					TASK_INTERRUPTIBLE);
+
+		/* Read frames from the queue */
+		skb = skb_array_consume(&q->skb_array);
+		if (skb)
+			break;
+		if (noblock) {
+			ret = -EAGAIN;
+			break;
+		}
+		if (signal_pending(current)) {
+			ret = -ERESTARTSYS;
+			break;
+		}
+		/* Nothing to read, let's sleep */
+		schedule();
+	}
+	if (!noblock)
+		finish_wait(sk_sleep(&q->sk), &wait);
+
+	if (skb) {
+		ret = macvtap_put_user(q, skb, to);
+		if (unlikely(ret < 0))
+			kfree_skb(skb);
+		else
+			consume_skb(skb);
+	}
+	return ret;
+}
+
+static ssize_t macvtap_read_iter(struct kiocb *iocb, struct iov_iter *to)
+{
+	struct file *file = iocb->ki_filp;
+	struct macvtap_queue *q = file->private_data;
+	ssize_t len = iov_iter_count(to), ret;
+
+	ret = macvtap_do_read(q, to, file->f_flags & O_NONBLOCK);
+	ret = min_t(ssize_t, ret, len);
+	if (ret > 0)
+		iocb->ki_pos = ret;
+	return ret;
+}
+
+static struct macvlan_dev *macvtap_get_vlan(struct macvtap_queue *q)
+{
+	struct macvlan_dev *vlan;
+
+	ASSERT_RTNL();
+	vlan = rtnl_dereference(q->vlan);
+	if (vlan)
+		dev_hold(vlan->dev);
+
+	return vlan;
+}
+
+static void macvtap_put_vlan(struct macvlan_dev *vlan)
+{
+	dev_put(vlan->dev);
+}
+
+static int macvtap_ioctl_set_queue(struct file *file, unsigned int flags)
+{
+	struct macvtap_queue *q = file->private_data;
+	struct macvlan_dev *vlan;
+	int ret;
+
+	vlan = macvtap_get_vlan(q);
+	if (!vlan)
+		return -EINVAL;
+
+	if (flags & IFF_ATTACH_QUEUE)
+		ret = macvtap_enable_queue(vlan->dev, file, q);
+	else if (flags & IFF_DETACH_QUEUE)
+		ret = macvtap_disable_queue(q);
+	else
+		ret = -EINVAL;
+
+	macvtap_put_vlan(vlan);
+	return ret;
+}
+
+static int set_offload(struct macvtap_queue *q, unsigned long arg)
+{
+	struct macvlan_dev *vlan;
+	netdev_features_t features;
+	netdev_features_t feature_mask = 0;
+
+	vlan = rtnl_dereference(q->vlan);
+	if (!vlan)
+		return -ENOLINK;
+
+	features = vlan->dev->features;
+
+	if (arg & TUN_F_CSUM) {
+		feature_mask = NETIF_F_HW_CSUM;
+
+		if (arg & (TUN_F_TSO4 | TUN_F_TSO6)) {
+			if (arg & TUN_F_TSO_ECN)
+				feature_mask |= NETIF_F_TSO_ECN;
+			if (arg & TUN_F_TSO4)
+				feature_mask |= NETIF_F_TSO;
+			if (arg & TUN_F_TSO6)
+				feature_mask |= NETIF_F_TSO6;
+		}
+
+		if (arg & TUN_F_UFO)
+			feature_mask |= NETIF_F_UFO;
+	}
+
+	/* tun/tap driver inverts the usage for TSO offloads, where
+	 * setting the TSO bit means that the userspace wants to
+	 * accept TSO frames and turning it off means that user space
+	 * does not support TSO.
+	 * For macvtap, we have to invert it to mean the same thing.
+	 * When user space turns off TSO, we turn off GSO/LRO so that
+	 * user-space will not receive TSO frames.
+	 */
+	if (feature_mask & (NETIF_F_TSO | NETIF_F_TSO6 | NETIF_F_UFO))
+		features |= RX_OFFLOADS;
+	else
+		features &= ~RX_OFFLOADS;
+
+	/* tap_features are the same as features on tun/tap and
+	 * reflect user expectations.
+	 */
+	vlan->tap_features = feature_mask;
+	vlan->set_features = features;
+	netdev_update_features(vlan->dev);
+
+	return 0;
+}
+
+/*
+ * provide compatibility with generic tun/tap interface
+ */
+static long macvtap_ioctl(struct file *file, unsigned int cmd,
+			  unsigned long arg)
+{
+	struct macvtap_queue *q = file->private_data;
+	struct macvlan_dev *vlan;
+	void __user *argp = (void __user *)arg;
+	struct ifreq __user *ifr = argp;
+	unsigned int __user *up = argp;
+	unsigned short u;
+	int __user *sp = argp;
+	struct sockaddr sa;
+	int s;
+	int ret;
+
+	switch (cmd) {
+	case TUNSETIFF:
+		/* ignore the name, just look at flags */
+		if (get_user(u, &ifr->ifr_flags))
+			return -EFAULT;
+
+		ret = 0;
+		if ((u & ~MACVTAP_FEATURES) != (IFF_NO_PI | IFF_TAP))
+			ret = -EINVAL;
+		else
+			q->flags = (q->flags & ~MACVTAP_FEATURES) | u;
+
+		return ret;
+
+	case TUNGETIFF:
+		rtnl_lock();
+		vlan = macvtap_get_vlan(q);
+		if (!vlan) {
+			rtnl_unlock();
+			return -ENOLINK;
+		}
+
+		ret = 0;
+		u = q->flags;
+		if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
+		    put_user(u, &ifr->ifr_flags))
+			ret = -EFAULT;
+		macvtap_put_vlan(vlan);
+		rtnl_unlock();
+		return ret;
+
+	case TUNSETQUEUE:
+		if (get_user(u, &ifr->ifr_flags))
+			return -EFAULT;
+		rtnl_lock();
+		ret = macvtap_ioctl_set_queue(file, u);
+		rtnl_unlock();
+		return ret;
+
+	case TUNGETFEATURES:
+		if (put_user(IFF_TAP | IFF_NO_PI | MACVTAP_FEATURES, up))
+			return -EFAULT;
+		return 0;
+
+	case TUNSETSNDBUF:
+		if (get_user(s, sp))
+			return -EFAULT;
+
+		q->sk.sk_sndbuf = s;
+		return 0;
+
+	case TUNGETVNETHDRSZ:
+		s = q->vnet_hdr_sz;
+		if (put_user(s, sp))
+			return -EFAULT;
+		return 0;
+
+	case TUNSETVNETHDRSZ:
+		if (get_user(s, sp))
+			return -EFAULT;
+		if (s < (int)sizeof(struct virtio_net_hdr))
+			return -EINVAL;
+
+		q->vnet_hdr_sz = s;
+		return 0;
+
+	case TUNGETVNETLE:
+		s = !!(q->flags & MACVTAP_VNET_LE);
+		if (put_user(s, sp))
+			return -EFAULT;
+		return 0;
+
+	case TUNSETVNETLE:
+		if (get_user(s, sp))
+			return -EFAULT;
+		if (s)
+			q->flags |= MACVTAP_VNET_LE;
+		else
+			q->flags &= ~MACVTAP_VNET_LE;
+		return 0;
+
+	case TUNGETVNETBE:
+		return macvtap_get_vnet_be(q, sp);
+
+	case TUNSETVNETBE:
+		return macvtap_set_vnet_be(q, sp);
+
+	case TUNSETOFFLOAD:
+		/* let the user check for future flags */
+		if (arg & ~(TUN_F_CSUM | TUN_F_TSO4 | TUN_F_TSO6 |
+			    TUN_F_TSO_ECN | TUN_F_UFO))
+			return -EINVAL;
+
+		rtnl_lock();
+		ret = set_offload(q, arg);
+		rtnl_unlock();
+		return ret;
+
+	case SIOCGIFHWADDR:
+		rtnl_lock();
+		vlan = macvtap_get_vlan(q);
+		if (!vlan) {
+			rtnl_unlock();
+			return -ENOLINK;
+		}
+		ret = 0;
+		u = vlan->dev->type;
+		if (copy_to_user(&ifr->ifr_name, vlan->dev->name, IFNAMSIZ) ||
+		    copy_to_user(&ifr->ifr_hwaddr.sa_data, vlan->dev->dev_addr, ETH_ALEN) ||
+		    put_user(u, &ifr->ifr_hwaddr.sa_family))
+			ret = -EFAULT;
+		macvtap_put_vlan(vlan);
+		rtnl_unlock();
+		return ret;
+
+	case SIOCSIFHWADDR:
+		if (copy_from_user(&sa, &ifr->ifr_hwaddr, sizeof(sa)))
+			return -EFAULT;
+		rtnl_lock();
+		vlan = macvtap_get_vlan(q);
+		if (!vlan) {
+			rtnl_unlock();
+			return -ENOLINK;
+		}
+		ret = dev_set_mac_address(vlan->dev, &sa);
+		macvtap_put_vlan(vlan);
+		rtnl_unlock();
+		return ret;
+
+	default:
+		return -EINVAL;
+	}
+}
+
+#ifdef CONFIG_COMPAT
+static long macvtap_compat_ioctl(struct file *file, unsigned int cmd,
+				 unsigned long arg)
+{
+	return macvtap_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
+}
+#endif
+
+const struct file_operations macvtap_fops = {
+	.owner		= THIS_MODULE,
+	.open		= macvtap_open,
+	.release	= macvtap_release,
+	.read_iter	= macvtap_read_iter,
+	.write_iter	= macvtap_write_iter,
+	.poll		= macvtap_poll,
+	.llseek		= no_llseek,
+	.unlocked_ioctl	= macvtap_ioctl,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl	= macvtap_compat_ioctl,
+#endif
+};
+
+static int macvtap_sendmsg(struct socket *sock, struct msghdr *m,
+			   size_t total_len)
+{
+	struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
+	return macvtap_get_user(q, m, &m->msg_iter, m->msg_flags & MSG_DONTWAIT);
+}
+
+static int macvtap_recvmsg(struct socket *sock, struct msghdr *m,
+			   size_t total_len, int flags)
+{
+	struct macvtap_queue *q = container_of(sock, struct macvtap_queue, sock);
+	int ret;
+	if (flags & ~(MSG_DONTWAIT|MSG_TRUNC))
+		return -EINVAL;
+	ret = macvtap_do_read(q, &m->msg_iter, flags & MSG_DONTWAIT);
+	if (ret > total_len) {
+		m->msg_flags |= MSG_TRUNC;
+		ret = flags & MSG_TRUNC ? ret : total_len;
+	}
+	return ret;
+}
+
+static int macvtap_peek_len(struct socket *sock)
+{
+	struct macvtap_queue *q = container_of(sock, struct macvtap_queue,
+					       sock);
+	return skb_array_peek_len(&q->skb_array);
+}
+
+/* Ops structure to mimic raw sockets with tun */
+static const struct proto_ops macvtap_socket_ops = {
+	.sendmsg = macvtap_sendmsg,
+	.recvmsg = macvtap_recvmsg,
+	.peek_len = macvtap_peek_len,
+};
+
+/* Get an underlying socket object from tun file.  Returns error unless file is
+ * attached to a device.  The returned object works like a packet socket, it
+ * can be used for sock_sendmsg/sock_recvmsg.  The caller is responsible for
+ * holding a reference to the file for as long as the socket is in use. */
+struct socket *macvtap_get_socket(struct file *file)
+{
+	struct macvtap_queue *q;
+	if (file->f_op != &macvtap_fops)
+		return ERR_PTR(-EINVAL);
+	q = file->private_data;
+	if (!q)
+		return ERR_PTR(-EBADFD);
+	return &q->sock;
+}
+EXPORT_SYMBOL_GPL(macvtap_get_socket);
+
+int macvtap_queue_resize(struct macvlan_dev *vlan)
+{
+	struct net_device *dev = vlan->dev;
+	struct macvtap_queue *q;
+	struct skb_array **arrays;
+	int n = vlan->numqueues;
+	int ret, i = 0;
+
+	arrays = kmalloc(sizeof *arrays * n, GFP_KERNEL);
+	if (!arrays)
+		return -ENOMEM;
+
+	list_for_each_entry(q, &vlan->queue_list, next)
+		arrays[i++] = &q->skb_array;
+
+	ret = skb_array_resize_multiple(arrays, n,
+					dev->tx_queue_len, GFP_KERNEL);
+
+	kfree(arrays);
+	return ret;
+}
diff --git a/include/linux/if_macvtap.h b/include/linux/if_macvtap.h
new file mode 100644
index 0000000..c9bf84b
--- /dev/null
+++ b/include/linux/if_macvtap.h
@@ -0,0 +1,10 @@
+#ifndef _LINUX_IF_MACVTAP_H_
+#define _LINUX_IF_MACVTAP_H_
+
+rx_handler_result_t macvtap_handle_frame(struct sk_buff **pskb);
+void macvtap_del_queues(struct net_device *dev);
+int macvtap_get_minor(struct macvlan_dev *vlan);
+void macvtap_free_minor(struct macvlan_dev *vlan);
+int macvtap_queue_resize(struct macvlan_dev *vlan);
+
+#endif /*_LINUX_IF_MACVTAP_H_*/
-- 
2.7.4