1 files changed, 249 insertions, 124 deletions

diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c
index ec6fb3fa59bb..2b51e2336aa2 100644
--- a/drivers/vhost/net.c
+++ b/drivers/vhost/net.c
@@ -59,25 +59,47 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;"
 #define VHOST_DMA_IS_DONE(len) ((len) >= VHOST_DMA_DONE_LEN)
 
 enum {
+	VHOST_NET_FEATURES = VHOST_FEATURES |
+			 (1ULL << VHOST_NET_F_VIRTIO_NET_HDR) |
+			 (1ULL << VIRTIO_NET_F_MRG_RXBUF),
+};
+
+enum {
 	VHOST_NET_VQ_RX = 0,
 	VHOST_NET_VQ_TX = 1,
 	VHOST_NET_VQ_MAX = 2,
 };
 
-enum vhost_net_poll_state {
-	VHOST_NET_POLL_DISABLED = 0,
-	VHOST_NET_POLL_STARTED = 1,
-	VHOST_NET_POLL_STOPPED = 2,
+struct vhost_net_ubuf_ref {
+	struct kref kref;
+	wait_queue_head_t wait;
+	struct vhost_virtqueue *vq;
+};
+
+struct vhost_net_virtqueue {
+	struct vhost_virtqueue vq;
+	/* hdr is used to store the virtio header.
+	 * Since each iovec has >= 1 byte length, we never need more than
+	 * header length entries to store the header. */
+	struct iovec hdr[sizeof(struct virtio_net_hdr_mrg_rxbuf)];
+	size_t vhost_hlen;
+	size_t sock_hlen;
+	/* vhost zerocopy support fields below: */
+	/* last used idx for outstanding DMA zerocopy buffers */
+	int upend_idx;
+	/* first used idx for DMA done zerocopy buffers */
+	int done_idx;
+	/* an array of userspace buffers info */
+	struct ubuf_info *ubuf_info;
+	/* Reference counting for outstanding ubufs.
+	 * Protected by vq mutex. Writers must also take device mutex. */
+	struct vhost_net_ubuf_ref *ubufs;
 };
 
 struct vhost_net {
 	struct vhost_dev dev;
-	struct vhost_virtqueue vqs[VHOST_NET_VQ_MAX];
+	struct vhost_net_virtqueue vqs[VHOST_NET_VQ_MAX];
 	struct vhost_poll poll[VHOST_NET_VQ_MAX];
-	/* Tells us whether we are polling a socket for TX.
-	 * We only do this when socket buffer fills up.
-	 * Protected by tx vq lock. */
-	enum vhost_net_poll_state tx_poll_state;
 	/* Number of TX recently submitted.
 	 * Protected by tx vq lock. */
 	unsigned tx_packets;
@@ -88,6 +110,104 @@ struct vhost_net {
 	bool tx_flush;
 };
 
+static unsigned vhost_net_zcopy_mask __read_mostly;
+
+static void vhost_net_enable_zcopy(int vq)
+{
+	vhost_net_zcopy_mask |= 0x1 << vq;
+}
+
+static void vhost_net_zerocopy_done_signal(struct kref *kref)
+{
+	struct vhost_net_ubuf_ref *ubufs;
+
+	ubufs = container_of(kref, struct vhost_net_ubuf_ref, kref);
+	wake_up(&ubufs->wait);
+}
+
+static struct vhost_net_ubuf_ref *
+vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy)
+{
+	struct vhost_net_ubuf_ref *ubufs;
+	/* No zero copy backend? Nothing to count. */
+	if (!zcopy)
+		return NULL;
+	ubufs = kmalloc(sizeof(*ubufs), GFP_KERNEL);
+	if (!ubufs)
+		return ERR_PTR(-ENOMEM);
+	kref_init(&ubufs->kref);
+	init_waitqueue_head(&ubufs->wait);
+	ubufs->vq = vq;
+	return ubufs;
+}
+
+static void vhost_net_ubuf_put(struct vhost_net_ubuf_ref *ubufs)
+{
+	kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal);
+}
+
+static void vhost_net_ubuf_put_and_wait(struct vhost_net_ubuf_ref *ubufs)
+{
+	kref_put(&ubufs->kref, vhost_net_zerocopy_done_signal);
+	wait_event(ubufs->wait, !atomic_read(&ubufs->kref.refcount));
+	kfree(ubufs);
+}
+
+static void vhost_net_clear_ubuf_info(struct vhost_net *n)
+{
+
+	bool zcopy;
+	int i;
+
+	for (i = 0; i < n->dev.nvqs; ++i) {
+		zcopy = vhost_net_zcopy_mask & (0x1 << i);
+		if (zcopy)
+			kfree(n->vqs[i].ubuf_info);
+	}
+}
+
+int vhost_net_set_ubuf_info(struct vhost_net *n)
+{
+	bool zcopy;
+	int i;
+
+	for (i = 0; i < n->dev.nvqs; ++i) {
+		zcopy = vhost_net_zcopy_mask & (0x1 << i);
+		if (!zcopy)
+			continue;
+		n->vqs[i].ubuf_info = kmalloc(sizeof(*n->vqs[i].ubuf_info) *
+					      UIO_MAXIOV, GFP_KERNEL);
+		if  (!n->vqs[i].ubuf_info)
+			goto err;
+	}
+	return 0;
+
+err:
+	while (i--) {
+		zcopy = vhost_net_zcopy_mask & (0x1 << i);
+		if (!zcopy)
+			continue;
+		kfree(n->vqs[i].ubuf_info);
+	}
+	return -ENOMEM;
+}
+
+void vhost_net_vq_reset(struct vhost_net *n)
+{
+	int i;
+
+	for (i = 0; i < VHOST_NET_VQ_MAX; i++) {
+		n->vqs[i].done_idx = 0;
+		n->vqs[i].upend_idx = 0;
+		n->vqs[i].ubufs = NULL;
+		kfree(n->vqs[i].ubuf_info);
+		n->vqs[i].ubuf_info = NULL;
+		n->vqs[i].vhost_hlen = 0;
+		n->vqs[i].sock_hlen = 0;
+	}
+
+}
+
 static void vhost_net_tx_packet(struct vhost_net *net)
 {
 	++net->tx_packets;
@@ -155,28 +275,6 @@ static void copy_iovec_hdr(const struct iovec *from, struct iovec *to,
 	}
 }
 
-/* Caller must have TX VQ lock */
-static void tx_poll_stop(struct vhost_net *net)
-{
-	if (likely(net->tx_poll_state != VHOST_NET_POLL_STARTED))
-		return;
-	vhost_poll_stop(net->poll + VHOST_NET_VQ_TX);
-	net->tx_poll_state = VHOST_NET_POLL_STOPPED;
-}
-
-/* Caller must have TX VQ lock */
-static int tx_poll_start(struct vhost_net *net, struct socket *sock)
-{
-	int ret;
-
-	if (unlikely(net->tx_poll_state != VHOST_NET_POLL_STOPPED))
-		return 0;
-	ret = vhost_poll_start(net->poll + VHOST_NET_VQ_TX, sock->file);
-	if (!ret)
-		net->tx_poll_state = VHOST_NET_POLL_STARTED;
-	return ret;
-}
-
 /* In case of DMA done not in order in lower device driver for some reason.
  * upend_idx is used to track end of used idx, done_idx is used to track head
  * of used idx. Once lower device DMA done contiguously, we will signal KVM
@@ -185,10 +283,12 @@ static int tx_poll_start(struct vhost_net *net, struct socket *sock)
 static int vhost_zerocopy_signal_used(struct vhost_net *net,
 				      struct vhost_virtqueue *vq)
 {
+	struct vhost_net_virtqueue *nvq =
+		container_of(vq, struct vhost_net_virtqueue, vq);
 	int i;
 	int j = 0;
 
-	for (i = vq->done_idx; i != vq->upend_idx; i = (i + 1) % UIO_MAXIOV) {
+	for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) {
 		if (vq->heads[i].len == VHOST_DMA_FAILED_LEN)
 			vhost_net_tx_err(net);
 		if (VHOST_DMA_IS_DONE(vq->heads[i].len)) {
@@ -200,13 +300,13 @@ static int vhost_zerocopy_signal_used(struct vhost_net *net,
 			break;
 	}
 	if (j)
-		vq->done_idx = i;
+		nvq->done_idx = i;
 	return j;
 }
 
 static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
 {
-	struct vhost_ubuf_ref *ubufs = ubuf->ctx;
+	struct vhost_net_ubuf_ref *ubufs = ubuf->ctx;
 	struct vhost_virtqueue *vq = ubufs->vq;
 	int cnt = atomic_read(&ubufs->kref.refcount);
 
@@ -223,14 +323,15 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success)
 	/* set len to mark this desc buffers done DMA */
 	vq->heads[ubuf->desc].len = success ?
 		VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN;
-	vhost_ubuf_put(ubufs);
+	vhost_net_ubuf_put(ubufs);
 }
 
 /* Expects to be always run from workqueue - which acts as
  * read-size critical section for our kind of RCU. */
 static void handle_tx(struct vhost_net *net)
 {
-	struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_TX];
+	struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX];
+	struct vhost_virtqueue *vq = &nvq->vq;
 	unsigned out, in, s;
 	int head;
 	struct msghdr msg = {
@@ -242,10 +343,10 @@ static void handle_tx(struct vhost_net *net)
 		.msg_flags = MSG_DONTWAIT,
 	};
 	size_t len, total_len = 0;
-	int err, wmem;
+	int err;
 	size_t hdr_size;
 	struct socket *sock;
-	struct vhost_ubuf_ref *uninitialized_var(ubufs);
+	struct vhost_net_ubuf_ref *uninitialized_var(ubufs);
 	bool zcopy, zcopy_used;
 
 	/* TODO: check that we are running from vhost_worker? */
@@ -253,21 +354,11 @@ static void handle_tx(struct vhost_net *net)
 	if (!sock)
 		return;
 
-	wmem = atomic_read(&sock->sk->sk_wmem_alloc);
-	if (wmem >= sock->sk->sk_sndbuf) {
-		mutex_lock(&vq->mutex);
-		tx_poll_start(net, sock);
-		mutex_unlock(&vq->mutex);
-		return;
-	}
-
 	mutex_lock(&vq->mutex);
 	vhost_disable_notify(&net->dev, vq);
 
-	if (wmem < sock->sk->sk_sndbuf / 2)
-		tx_poll_stop(net);
-	hdr_size = vq->vhost_hlen;
-	zcopy = vq->ubufs;
+	hdr_size = nvq->vhost_hlen;
+	zcopy = nvq->ubufs;
 
 	for (;;) {
 		/* Release DMAs done buffers first */
@@ -285,23 +376,15 @@ static void handle_tx(struct vhost_net *net)
 		if (head == vq->num) {
 			int num_pends;
 
-			wmem = atomic_read(&sock->sk->sk_wmem_alloc);
-			if (wmem >= sock->sk->sk_sndbuf * 3 / 4) {
-				tx_poll_start(net, sock);
-				set_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
-				break;
-			}
 			/* If more outstanding DMAs, queue the work.
 			 * Handle upend_idx wrap around
 			 */
-			num_pends = likely(vq->upend_idx >= vq->done_idx) ?
-				    (vq->upend_idx - vq->done_idx) :
-				    (vq->upend_idx + UIO_MAXIOV - vq->done_idx);
-			if (unlikely(num_pends > VHOST_MAX_PEND)) {
-				tx_poll_start(net, sock);
-				set_bit(SOCK_ASYNC_NOSPACE, &sock->flags);
+			num_pends = likely(nvq->upend_idx >= nvq->done_idx) ?
+				    (nvq->upend_idx - nvq->done_idx) :
+				    (nvq->upend_idx + UIO_MAXIOV -
+				     nvq->done_idx);
+			if (unlikely(num_pends > VHOST_MAX_PEND))
 				break;
-			}
 			if (unlikely(vhost_enable_notify(&net->dev, vq))) {
 				vhost_disable_notify(&net->dev, vq);
 				continue;
@@ -314,58 +397,56 @@ static void handle_tx(struct vhost_net *net)
 			break;
 		}
 		/* Skip header. TODO: support TSO. */
-		s = move_iovec_hdr(vq->iov, vq->hdr, hdr_size, out);
+		s = move_iovec_hdr(vq->iov, nvq->hdr, hdr_size, out);
 		msg.msg_iovlen = out;
 		len = iov_length(vq->iov, out);
 		/* Sanity check */
 		if (!len) {
 			vq_err(vq, "Unexpected header len for TX: "
 			       "%zd expected %zd\n",
-			       iov_length(vq->hdr, s), hdr_size);
+			       iov_length(nvq->hdr, s), hdr_size);
 			break;
 		}
 		zcopy_used = zcopy && (len >= VHOST_GOODCOPY_LEN ||
-				       vq->upend_idx != vq->done_idx);
+				       nvq->upend_idx != nvq->done_idx);
 
 		/* use msg_control to pass vhost zerocopy ubuf info to skb */
 		if (zcopy_used) {
-			vq->heads[vq->upend_idx].id = head;
+			vq->heads[nvq->upend_idx].id = head;
 			if (!vhost_net_tx_select_zcopy(net) ||
 			    len < VHOST_GOODCOPY_LEN) {
 				/* copy don't need to wait for DMA done */
-				vq->heads[vq->upend_idx].len =
+				vq->heads[nvq->upend_idx].len =
 							VHOST_DMA_DONE_LEN;
 				msg.msg_control = NULL;
 				msg.msg_controllen = 0;
 				ubufs = NULL;
 			} else {
 				struct ubuf_info *ubuf;
-				ubuf = vq->ubuf_info + vq->upend_idx;
+				ubuf = nvq->ubuf_info + nvq->upend_idx;
 
-				vq->heads[vq->upend_idx].len =
+				vq->heads[nvq->upend_idx].len =
 					VHOST_DMA_IN_PROGRESS;
 				ubuf->callback = vhost_zerocopy_callback;
-				ubuf->ctx = vq->ubufs;
-				ubuf->desc = vq->upend_idx;
+				ubuf->ctx = nvq->ubufs;
+				ubuf->desc = nvq->upend_idx;
 				msg.msg_control = ubuf;
 				msg.msg_controllen = sizeof(ubuf);
-				ubufs = vq->ubufs;
+				ubufs = nvq->ubufs;
 				kref_get(&ubufs->kref);
 			}
-			vq->upend_idx = (vq->upend_idx + 1) % UIO_MAXIOV;
+			nvq->upend_idx = (nvq->upend_idx + 1) % UIO_MAXIOV;
 		}
 		/* TODO: Check specific error and bomb out unless ENOBUFS? */
 		err = sock->ops->sendmsg(NULL, sock, &msg, len);
 		if (unlikely(err < 0)) {
 			if (zcopy_used) {
 				if (ubufs)
-					vhost_ubuf_put(ubufs);
-				vq->upend_idx = ((unsigned)vq->upend_idx - 1) %
-					UIO_MAXIOV;
+					vhost_net_ubuf_put(ubufs);
+				nvq->upend_idx = ((unsigned)nvq->upend_idx - 1)
+					% UIO_MAXIOV;
 			}
 			vhost_discard_vq_desc(vq, 1);
-			if (err == -EAGAIN || err == -ENOBUFS)
-				tx_poll_start(net, sock);
 			break;
 		}
 		if (err != len)
@@ -470,7 +551,8 @@ err:
  * read-size critical section for our kind of RCU. */
 static void handle_rx(struct vhost_net *net)
 {
-	struct vhost_virtqueue *vq = &net->dev.vqs[VHOST_NET_VQ_RX];
+	struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_RX];
+	struct vhost_virtqueue *vq = &nvq->vq;
 	unsigned uninitialized_var(in), log;
 	struct vhost_log *vq_log;
 	struct msghdr msg = {
@@ -498,8 +580,8 @@ static void handle_rx(struct vhost_net *net)
 
 	mutex_lock(&vq->mutex);
 	vhost_disable_notify(&net->dev, vq);
-	vhost_hlen = vq->vhost_hlen;
-	sock_hlen = vq->sock_hlen;
+	vhost_hlen = nvq->vhost_hlen;
+	sock_hlen = nvq->sock_hlen;
 
 	vq_log = unlikely(vhost_has_feature(&net->dev, VHOST_F_LOG_ALL)) ?
 		vq->log : NULL;
@@ -529,11 +611,11 @@ static void handle_rx(struct vhost_net *net)
 		/* We don't need to be notified again. */
 		if (unlikely((vhost_hlen)))
 			/* Skip header. TODO: support TSO. */
-			move_iovec_hdr(vq->iov, vq->hdr, vhost_hlen, in);
+			move_iovec_hdr(vq->iov, nvq->hdr, vhost_hlen, in);
 		else
 			/* Copy the header for use in VIRTIO_NET_F_MRG_RXBUF:
 			 * needed because recvmsg can modify msg_iov. */
-			copy_iovec_hdr(vq->iov, vq->hdr, sock_hlen, in);
+			copy_iovec_hdr(vq->iov, nvq->hdr, sock_hlen, in);
 		msg.msg_iovlen = in;
 		err = sock->ops->recvmsg(NULL, sock, &msg,
 					 sock_len, MSG_DONTWAIT | MSG_TRUNC);
@@ -547,7 +629,7 @@ static void handle_rx(struct vhost_net *net)
 			continue;
 		}
 		if (unlikely(vhost_hlen) &&
-		    memcpy_toiovecend(vq->hdr, (unsigned char *)&hdr, 0,
+		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&hdr, 0,
 				      vhost_hlen)) {
 			vq_err(vq, "Unable to write vnet_hdr at addr %p\n",
 			       vq->iov->iov_base);
@@ -555,7 +637,7 @@ static void handle_rx(struct vhost_net *net)
 		}
 		/* TODO: Should check and handle checksum. */
 		if (likely(mergeable) &&
-		    memcpy_toiovecend(vq->hdr, (unsigned char *)&headcount,
+		    memcpy_toiovecend(nvq->hdr, (unsigned char *)&headcount,
 				      offsetof(typeof(hdr), num_buffers),
 				      sizeof hdr.num_buffers)) {
 			vq_err(vq, "Failed num_buffers write");
@@ -612,23 +694,39 @@ static int vhost_net_open(struct inode *inode, struct file *f)
 {
 	struct vhost_net *n = kmalloc(sizeof *n, GFP_KERNEL);
 	struct vhost_dev *dev;
-	int r;
+	struct vhost_virtqueue **vqs;
+	int r, i;
 
 	if (!n)
 		return -ENOMEM;
+	vqs = kmalloc(VHOST_NET_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
+	if (!vqs) {
+		kfree(n);
+		return -ENOMEM;
+	}
 
 	dev = &n->dev;
-	n->vqs[VHOST_NET_VQ_TX].handle_kick = handle_tx_kick;
-	n->vqs[VHOST_NET_VQ_RX].handle_kick = handle_rx_kick;
-	r = vhost_dev_init(dev, n->vqs, VHOST_NET_VQ_MAX);
+	vqs[VHOST_NET_VQ_TX] = &n->vqs[VHOST_NET_VQ_TX].vq;
+	vqs[VHOST_NET_VQ_RX] = &n->vqs[VHOST_NET_VQ_RX].vq;
+	n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick;
+	n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick;
+	for (i = 0; i < VHOST_NET_VQ_MAX; i++) {
+		n->vqs[i].ubufs = NULL;
+		n->vqs[i].ubuf_info = NULL;
+		n->vqs[i].upend_idx = 0;
+		n->vqs[i].done_idx = 0;
+		n->vqs[i].vhost_hlen = 0;
+		n->vqs[i].sock_hlen = 0;
+	}
+	r = vhost_dev_init(dev, vqs, VHOST_NET_VQ_MAX);
 	if (r < 0) {
 		kfree(n);
+		kfree(vqs);
 		return r;
 	}
 
 	vhost_poll_init(n->poll + VHOST_NET_VQ_TX, handle_tx_net, POLLOUT, dev);
 	vhost_poll_init(n->poll + VHOST_NET_VQ_RX, handle_rx_net, POLLIN, dev);
-	n->tx_poll_state = VHOST_NET_POLL_DISABLED;
 
 	f->private_data = n;
 
@@ -638,32 +736,28 @@ static int vhost_net_open(struct inode *inode, struct file *f)
 static void vhost_net_disable_vq(struct vhost_net *n,
 				 struct vhost_virtqueue *vq)
 {
+	struct vhost_net_virtqueue *nvq =
+		container_of(vq, struct vhost_net_virtqueue, vq);
+	struct vhost_poll *poll = n->poll + (nvq - n->vqs);
 	if (!vq->private_data)
 		return;
-	if (vq == n->vqs + VHOST_NET_VQ_TX) {
-		tx_poll_stop(n);
-		n->tx_poll_state = VHOST_NET_POLL_DISABLED;
-	} else
-		vhost_poll_stop(n->poll + VHOST_NET_VQ_RX);
+	vhost_poll_stop(poll);
 }
 
 static int vhost_net_enable_vq(struct vhost_net *n,
 				struct vhost_virtqueue *vq)
 {
+	struct vhost_net_virtqueue *nvq =
+		container_of(vq, struct vhost_net_virtqueue, vq);
+	struct vhost_poll *poll = n->poll + (nvq - n->vqs);
 	struct socket *sock;
-	int ret;
 
 	sock = rcu_dereference_protected(vq->private_data,
 					 lockdep_is_held(&vq->mutex));
 	if (!sock)
 		return 0;
-	if (vq == n->vqs + VHOST_NET_VQ_TX) {
-		n->tx_poll_state = VHOST_NET_POLL_STOPPED;
-		ret = tx_poll_start(n, sock);
-	} else
-		ret = vhost_poll_start(n->poll + VHOST_NET_VQ_RX, sock->file);
 
-	return ret;
+	return vhost_poll_start(poll, sock->file);
 }
 
 static struct socket *vhost_net_stop_vq(struct vhost_net *n,
@@ -683,30 +777,30 @@ static struct socket *vhost_net_stop_vq(struct vhost_net *n,
 static void vhost_net_stop(struct vhost_net *n, struct socket **tx_sock,
 			   struct socket **rx_sock)
 {
-	*tx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_TX);
-	*rx_sock = vhost_net_stop_vq(n, n->vqs + VHOST_NET_VQ_RX);
+	*tx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_TX].vq);
+	*rx_sock = vhost_net_stop_vq(n, &n->vqs[VHOST_NET_VQ_RX].vq);
 }
 
 static void vhost_net_flush_vq(struct vhost_net *n, int index)
 {
 	vhost_poll_flush(n->poll + index);
-	vhost_poll_flush(&n->dev.vqs[index].poll);
+	vhost_poll_flush(&n->vqs[index].vq.poll);
 }
 
 static void vhost_net_flush(struct vhost_net *n)
 {
 	vhost_net_flush_vq(n, VHOST_NET_VQ_TX);
 	vhost_net_flush_vq(n, VHOST_NET_VQ_RX);
-	if (n->dev.vqs[VHOST_NET_VQ_TX].ubufs) {
-		mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
+	if (n->vqs[VHOST_NET_VQ_TX].ubufs) {
+		mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
 		n->tx_flush = true;
-		mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
+		mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
 		/* Wait for all lower device DMAs done. */
-		vhost_ubuf_put_and_wait(n->dev.vqs[VHOST_NET_VQ_TX].ubufs);
-		mutex_lock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
+		vhost_net_ubuf_put_and_wait(n->vqs[VHOST_NET_VQ_TX].ubufs);
+		mutex_lock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
 		n->tx_flush = false;
-		kref_init(&n->dev.vqs[VHOST_NET_VQ_TX].ubufs->kref);
-		mutex_unlock(&n->dev.vqs[VHOST_NET_VQ_TX].mutex);
+		kref_init(&n->vqs[VHOST_NET_VQ_TX].ubufs->kref);
+		mutex_unlock(&n->vqs[VHOST_NET_VQ_TX].vq.mutex);
 	}
 }
 
@@ -720,6 +814,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
 	vhost_net_flush(n);
 	vhost_dev_stop(&n->dev);
 	vhost_dev_cleanup(&n->dev, false);
+	vhost_net_vq_reset(n);
 	if (tx_sock)
 		fput(tx_sock->file);
 	if (rx_sock)
@@ -727,6 +822,7 @@ static int vhost_net_release(struct inode *inode, struct file *f)
 	/* We do an extra flush before freeing memory,
 	 * since jobs can re-queue themselves. */
 	vhost_net_flush(n);
+	kfree(n->dev.vqs);
 	kfree(n);
 	return 0;
 }
@@ -800,7 +896,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
 {
 	struct socket *sock, *oldsock;
 	struct vhost_virtqueue *vq;
-	struct vhost_ubuf_ref *ubufs, *oldubufs = NULL;
+	struct vhost_net_virtqueue *nvq;
+	struct vhost_net_ubuf_ref *ubufs, *oldubufs = NULL;
 	int r;
 
 	mutex_lock(&n->dev.mutex);
@@ -812,7 +909,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
 		r = -ENOBUFS;
 		goto err;
 	}
-	vq = n->vqs + index;
+	vq = &n->vqs[index].vq;
+	nvq = &n->vqs[index];
 	mutex_lock(&vq->mutex);
 
 	/* Verify that ring has been setup correctly. */
@@ -830,7 +928,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
 	oldsock = rcu_dereference_protected(vq->private_data,
 					    lockdep_is_held(&vq->mutex));
 	if (sock != oldsock) {
-		ubufs = vhost_ubuf_alloc(vq, sock && vhost_sock_zcopy(sock));
+		ubufs = vhost_net_ubuf_alloc(vq,
+					     sock && vhost_sock_zcopy(sock));
 		if (IS_ERR(ubufs)) {
 			r = PTR_ERR(ubufs);
 			goto err_ubufs;
@@ -845,8 +944,8 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
 		if (r)
 			goto err_used;
 
-		oldubufs = vq->ubufs;
-		vq->ubufs = ubufs;
+		oldubufs = nvq->ubufs;
+		nvq->ubufs = ubufs;
 
 		n->tx_packets = 0;
 		n->tx_zcopy_err = 0;
@@ -856,7 +955,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd)
 	mutex_unlock(&vq->mutex);
 
 	if (oldubufs) {
-		vhost_ubuf_put_and_wait(oldubufs);
+		vhost_net_ubuf_put_and_wait(oldubufs);
 		mutex_lock(&vq->mutex);
 		vhost_zerocopy_signal_used(n, vq);
 		mutex_unlock(&vq->mutex);
@@ -874,7 +973,7 @@ err_used:
 	rcu_assign_pointer(vq->private_data, oldsock);
 	vhost_net_enable_vq(n, vq);
 	if (ubufs)
-		vhost_ubuf_put_and_wait(ubufs);
+		vhost_net_ubuf_put_and_wait(ubufs);
 err_ubufs:
 	fput(sock->file);
 err_vq:
@@ -889,14 +988,21 @@ static long vhost_net_reset_owner(struct vhost_net *n)
 	struct socket *tx_sock = NULL;
 	struct socket *rx_sock = NULL;
 	long err;
+	struct vhost_memory *memory;
 
 	mutex_lock(&n->dev.mutex);
 	err = vhost_dev_check_owner(&n->dev);
 	if (err)
 		goto done;
+	memory = vhost_dev_reset_owner_prepare();
+	if (!memory) {
+		err = -ENOMEM;
+		goto done;
+	}
 	vhost_net_stop(n, &tx_sock, &rx_sock);
 	vhost_net_flush(n);
-	err = vhost_dev_reset_owner(&n->dev);
+	vhost_dev_reset_owner(&n->dev, memory);
+	vhost_net_vq_reset(n);
 done:
 	mutex_unlock(&n->dev.mutex);
 	if (tx_sock)
@@ -932,16 +1038,33 @@ static int vhost_net_set_features(struct vhost_net *n, u64 features)
 	n->dev.acked_features = features;
 	smp_wmb();
 	for (i = 0; i < VHOST_NET_VQ_MAX; ++i) {
-		mutex_lock(&n->vqs[i].mutex);
+		mutex_lock(&n->vqs[i].vq.mutex);
 		n->vqs[i].vhost_hlen = vhost_hlen;
 		n->vqs[i].sock_hlen = sock_hlen;
-		mutex_unlock(&n->vqs[i].mutex);
+		mutex_unlock(&n->vqs[i].vq.mutex);
 	}
 	vhost_net_flush(n);
 	mutex_unlock(&n->dev.mutex);
 	return 0;
 }
 
+static long vhost_net_set_owner(struct vhost_net *n)
+{
+	int r;
+
+	mutex_lock(&n->dev.mutex);
+	r = vhost_net_set_ubuf_info(n);
+	if (r)
+		goto out;
+	r = vhost_dev_set_owner(&n->dev);
+	if (r)
+		vhost_net_clear_ubuf_info(n);
+	vhost_net_flush(n);
+out:
+	mutex_unlock(&n->dev.mutex);
+	return r;
+}
+
 static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
 			    unsigned long arg)
 {
@@ -970,6 +1093,8 @@ static long vhost_net_ioctl(struct file *f, unsigned int ioctl,
 		return vhost_net_set_features(n, features);
 	case VHOST_RESET_OWNER:
 		return vhost_net_reset_owner(n);
+	case VHOST_SET_OWNER:
+		return vhost_net_set_owner(n);
 	default:
 		mutex_lock(&n->dev.mutex);
 		r = vhost_dev_ioctl(&n->dev, ioctl, argp);
@@ -1010,7 +1135,7 @@ static struct miscdevice vhost_net_misc = {
 static int vhost_net_init(void)
 {
 	if (experimental_zcopytx)
-		vhost_enable_zcopy(VHOST_NET_VQ_TX);
+		vhost_net_enable_zcopy(VHOST_NET_VQ_TX);
 	return misc_register(&vhost_net_misc);
 }
 module_init(vhost_net_init);