1 files changed, 669 insertions, 122 deletions

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 42bb820a56c9..0dc66e4fbb2c 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -75,6 +75,7 @@
 #include <linux/skb_array.h>
 #include <linux/bpf.h>
 #include <linux/bpf_trace.h>
+#include <linux/mutex.h>
 
 #include <linux/uaccess.h>
 
@@ -121,7 +122,8 @@ do {								\
 #define TUN_VNET_BE     0x40000000
 
 #define TUN_FEATURES (IFF_NO_PI | IFF_ONE_QUEUE | IFF_VNET_HDR | \
-		      IFF_MULTI_QUEUE)
+		      IFF_MULTI_QUEUE | IFF_NAPI | IFF_NAPI_FRAGS)
+
 #define GOODCOPY_LEN 128
 
 #define FLT_EXACT_COUNT 8
@@ -172,9 +174,13 @@ struct tun_file {
 		u16 queue_index;
 		unsigned int ifindex;
 	};
+	struct napi_struct napi;
+	bool napi_enabled;
+	struct mutex napi_mutex;	/* Protects access to the above napi */
 	struct list_head next;
 	struct tun_struct *detached;
-	struct skb_array tx_array;
+	struct ptr_ring tx_ring;
+	struct xdp_rxq_info xdp_rxq;
 };
 
 struct tun_flow_entry {
@@ -190,6 +196,11 @@ struct tun_flow_entry {
 
 #define TUN_NUM_FLOW_ENTRIES 1024
 
+struct tun_prog {
+	struct rcu_head rcu;
+	struct bpf_prog *prog;
+};
+
 /* Since the socket were moved to tun_file, to preserve the behavior of persist
  * device, socket filter, sndbuf and vnet header size were restore when the
  * file were attached to a persist device.
@@ -227,8 +238,102 @@ struct tun_struct {
 	u32 rx_batched;
 	struct tun_pcpu_stats __percpu *pcpu_stats;
 	struct bpf_prog __rcu *xdp_prog;
+	struct tun_prog __rcu *steering_prog;
+	struct tun_prog __rcu *filter_prog;
+};
+
+struct veth {
+	__be16 h_vlan_proto;
+	__be16 h_vlan_TCI;
 };
 
+bool tun_is_xdp_buff(void *ptr)
+{
+	return (unsigned long)ptr & TUN_XDP_FLAG;
+}
+EXPORT_SYMBOL(tun_is_xdp_buff);
+
+void *tun_xdp_to_ptr(void *ptr)
+{
+	return (void *)((unsigned long)ptr | TUN_XDP_FLAG);
+}
+EXPORT_SYMBOL(tun_xdp_to_ptr);
+
+void *tun_ptr_to_xdp(void *ptr)
+{
+	return (void *)((unsigned long)ptr & ~TUN_XDP_FLAG);
+}
+EXPORT_SYMBOL(tun_ptr_to_xdp);
+
+static int tun_napi_receive(struct napi_struct *napi, int budget)
+{
+	struct tun_file *tfile = container_of(napi, struct tun_file, napi);
+	struct sk_buff_head *queue = &tfile->sk.sk_write_queue;
+	struct sk_buff_head process_queue;
+	struct sk_buff *skb;
+	int received = 0;
+
+	__skb_queue_head_init(&process_queue);
+
+	spin_lock(&queue->lock);
+	skb_queue_splice_tail_init(queue, &process_queue);
+	spin_unlock(&queue->lock);
+
+	while (received < budget && (skb = __skb_dequeue(&process_queue))) {
+		napi_gro_receive(napi, skb);
+		++received;
+	}
+
+	if (!skb_queue_empty(&process_queue)) {
+		spin_lock(&queue->lock);
+		skb_queue_splice(&process_queue, queue);
+		spin_unlock(&queue->lock);
+	}
+
+	return received;
+}
+
+static int tun_napi_poll(struct napi_struct *napi, int budget)
+{
+	unsigned int received;
+
+	received = tun_napi_receive(napi, budget);
+
+	if (received < budget)
+		napi_complete_done(napi, received);
+
+	return received;
+}
+
+static void tun_napi_init(struct tun_struct *tun, struct tun_file *tfile,
+			  bool napi_en)
+{
+	tfile->napi_enabled = napi_en;
+	if (napi_en) {
+		netif_napi_add(tun->dev, &tfile->napi, tun_napi_poll,
+			       NAPI_POLL_WEIGHT);
+		napi_enable(&tfile->napi);
+		mutex_init(&tfile->napi_mutex);
+	}
+}
+
+static void tun_napi_disable(struct tun_struct *tun, struct tun_file *tfile)
+{
+	if (tfile->napi_enabled)
+		napi_disable(&tfile->napi);
+}
+
+static void tun_napi_del(struct tun_struct *tun, struct tun_file *tfile)
+{
+	if (tfile->napi_enabled)
+		netif_napi_del(&tfile->napi);
+}
+
+static bool tun_napi_frags_enabled(const struct tun_struct *tun)
+{
+	return READ_ONCE(tun->flags) & IFF_NAPI_FRAGS;
+}
+
 #ifdef CONFIG_TUN_VNET_CROSS_LE
 static inline bool tun_legacy_is_little_endian(struct tun_struct *tun)
 {
@@ -370,9 +475,9 @@ static void tun_flow_delete_by_queue(struct tun_struct *tun, u16 queue_index)
 	spin_unlock_bh(&tun->lock);
 }
 
-static void tun_flow_cleanup(unsigned long data)
+static void tun_flow_cleanup(struct timer_list *t)
 {
-	struct tun_struct *tun = (struct tun_struct *)data;
+	struct tun_struct *tun = from_timer(tun, t, flow_gc_timer);
 	unsigned long delay = tun->ageing_time;
 	unsigned long next_timer = jiffies + delay;
 	unsigned long count = 0;
@@ -380,25 +485,28 @@ static void tun_flow_cleanup(unsigned long data)
 
 	tun_debug(KERN_INFO, tun, "tun_flow_cleanup\n");
 
-	spin_lock_bh(&tun->lock);
+	spin_lock(&tun->lock);
 	for (i = 0; i < TUN_NUM_FLOW_ENTRIES; i++) {
 		struct tun_flow_entry *e;
 		struct hlist_node *n;
 
 		hlist_for_each_entry_safe(e, n, &tun->flows[i], hash_link) {
 			unsigned long this_timer;
-			count++;
+
 			this_timer = e->updated + delay;
-			if (time_before_eq(this_timer, jiffies))
+			if (time_before_eq(this_timer, jiffies)) {
 				tun_flow_delete(tun, e);
-			else if (time_before(this_timer, next_timer))
+				continue;
+			}
+			count++;
+			if (time_before(this_timer, next_timer))
 				next_timer = this_timer;
 		}
 	}
 
 	if (count)
 		mod_timer(&tun->flow_gc_timer, round_jiffies_up(next_timer));
-	spin_unlock_bh(&tun->lock);
+	spin_unlock(&tun->lock);
 }
 
 static void tun_flow_update(struct tun_struct *tun, u32 rxhash,
@@ -460,16 +568,13 @@ static inline void tun_flow_save_rps_rxhash(struct tun_flow_entry *e, u32 hash)
  * different rxq no. here. If we could not get rxhash, then we would
  * hope the rxq no. may help here.
  */
-static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb,
-			    void *accel_priv, select_queue_fallback_t fallback)
+static u16 tun_automq_select_queue(struct tun_struct *tun, struct sk_buff *skb)
 {
-	struct tun_struct *tun = netdev_priv(dev);
 	struct tun_flow_entry *e;
 	u32 txq = 0;
 	u32 numqueues = 0;
 
-	rcu_read_lock();
-	numqueues = ACCESS_ONCE(tun->numqueues);
+	numqueues = READ_ONCE(tun->numqueues);
 
 	txq = __skb_get_hash_symmetric(skb);
 	if (txq) {
@@ -486,10 +591,37 @@ static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb,
 			txq -= numqueues;
 	}
 
-	rcu_read_unlock();
 	return txq;
 }
 
+static u16 tun_ebpf_select_queue(struct tun_struct *tun, struct sk_buff *skb)
+{
+	struct tun_prog *prog;
+	u16 ret = 0;
+
+	prog = rcu_dereference(tun->steering_prog);
+	if (prog)
+		ret = bpf_prog_run_clear_cb(prog->prog, skb);
+
+	return ret % tun->numqueues;
+}
+
+static u16 tun_select_queue(struct net_device *dev, struct sk_buff *skb,
+			    void *accel_priv, select_queue_fallback_t fallback)
+{
+	struct tun_struct *tun = netdev_priv(dev);
+	u16 ret;
+
+	rcu_read_lock();
+	if (rcu_dereference(tun->steering_prog))
+		ret = tun_ebpf_select_queue(tun, skb);
+	else
+		ret = tun_automq_select_queue(tun, skb);
+	rcu_read_unlock();
+
+	return ret;
+}
+
 static inline bool tun_not_capable(struct tun_struct *tun)
 {
 	const struct cred *cred = current_cred();
@@ -523,17 +655,39 @@ static struct tun_struct *tun_enable_queue(struct tun_file *tfile)
 	return tun;
 }
 
+static void tun_ptr_free(void *ptr)
+{
+	if (!ptr)
+		return;
+	if (tun_is_xdp_buff(ptr)) {
+		struct xdp_buff *xdp = tun_ptr_to_xdp(ptr);
+
+		put_page(virt_to_head_page(xdp->data));
+	} else {
+		__skb_array_destroy_skb(ptr);
+	}
+}
+
 static void tun_queue_purge(struct tun_file *tfile)
 {
-	struct sk_buff *skb;
+	void *ptr;
 
-	while ((skb = skb_array_consume(&tfile->tx_array)) != NULL)
-		kfree_skb(skb);
+	while ((ptr = ptr_ring_consume(&tfile->tx_ring)) != NULL)
+		tun_ptr_free(ptr);
 
 	skb_queue_purge(&tfile->sk.sk_write_queue);
 	skb_queue_purge(&tfile->sk.sk_error_queue);
 }
 
+static void tun_cleanup_tx_ring(struct tun_file *tfile)
+{
+	if (tfile->tx_ring.queue) {
+		ptr_ring_cleanup(&tfile->tx_ring, tun_ptr_free);
+		xdp_rxq_info_unreg(&tfile->xdp_rxq);
+		memset(&tfile->tx_ring, 0, sizeof(tfile->tx_ring));
+	}
+}
+
 static void __tun_detach(struct tun_file *tfile, bool clean)
 {
 	struct tun_file *ntfile;
@@ -541,6 +695,11 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
 
 	tun = rtnl_dereference(tfile->tun);
 
+	if (tun && clean) {
+		tun_napi_disable(tun, tfile);
+		tun_napi_del(tun, tfile);
+	}
+
 	if (tun && !tfile->detached) {
 		u16 index = tfile->queue_index;
 		BUG_ON(index >= tun->numqueues);
@@ -575,8 +734,7 @@ static void __tun_detach(struct tun_file *tfile, bool clean)
 			    tun->dev->reg_state == NETREG_REGISTERED)
 				unregister_netdevice(tun->dev);
 		}
-		if (tun)
-			skb_array_cleanup(&tfile->tx_array);
+		tun_cleanup_tx_ring(tfile);
 		sock_put(&tfile->sk);
 	}
 }
@@ -591,13 +749,13 @@ static void tun_detach(struct tun_file *tfile, bool clean)
 static void tun_detach_all(struct net_device *dev)
 {
 	struct tun_struct *tun = netdev_priv(dev);
-	struct bpf_prog *xdp_prog = rtnl_dereference(tun->xdp_prog);
 	struct tun_file *tfile, *tmp;
 	int i, n = tun->numqueues;
 
 	for (i = 0; i < n; i++) {
 		tfile = rtnl_dereference(tun->tfiles[i]);
 		BUG_ON(!tfile);
+		tun_napi_disable(tun, tfile);
 		tfile->socket.sk->sk_shutdown = RCV_SHUTDOWN;
 		tfile->socket.sk->sk_data_ready(tfile->socket.sk);
 		RCU_INIT_POINTER(tfile->tun, NULL);
@@ -613,25 +771,26 @@ static void tun_detach_all(struct net_device *dev)
 	synchronize_net();
 	for (i = 0; i < n; i++) {
 		tfile = rtnl_dereference(tun->tfiles[i]);
+		tun_napi_del(tun, tfile);
 		/* Drop read queue */
 		tun_queue_purge(tfile);
 		sock_put(&tfile->sk);
+		tun_cleanup_tx_ring(tfile);
 	}
 	list_for_each_entry_safe(tfile, tmp, &tun->disabled, next) {
 		tun_enable_queue(tfile);
 		tun_queue_purge(tfile);
 		sock_put(&tfile->sk);
+		tun_cleanup_tx_ring(tfile);
 	}
 	BUG_ON(tun->numdisabled != 0);
 
-	if (xdp_prog)
-		bpf_prog_put(xdp_prog);
-
 	if (tun->flags & IFF_PERSIST)
 		module_put(THIS_MODULE);
 }
 
-static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filter)
+static int tun_attach(struct tun_struct *tun, struct file *file,
+		      bool skip_filter, bool napi)
 {
 	struct tun_file *tfile = file->private_data;
 	struct net_device *dev = tun->dev;
@@ -666,21 +825,39 @@ static int tun_attach(struct tun_struct *tun, struct file *file, bool skip_filte
 	}
 
 	if (!tfile->detached &&
-	    skb_array_init(&tfile->tx_array, dev->tx_queue_len, GFP_KERNEL)) {
+	    ptr_ring_init(&tfile->tx_ring, dev->tx_queue_len, GFP_KERNEL)) {
 		err = -ENOMEM;
 		goto out;
 	}
 
 	tfile->queue_index = tun->numqueues;
 	tfile->socket.sk->sk_shutdown &= ~RCV_SHUTDOWN;
+
+	if (tfile->detached) {
+		/* Re-attach detached tfile, updating XDP queue_index */
+		WARN_ON(!xdp_rxq_info_is_reg(&tfile->xdp_rxq));
+
+		if (tfile->xdp_rxq.queue_index    != tfile->queue_index)
+			tfile->xdp_rxq.queue_index = tfile->queue_index;
+	} else {
+		/* Setup XDP RX-queue info, for new tfile getting attached */
+		err = xdp_rxq_info_reg(&tfile->xdp_rxq,
+				       tun->dev, tfile->queue_index);
+		if (err < 0)
+			goto out;
+		err = 0;
+	}
+
 	rcu_assign_pointer(tfile->tun, tun);
 	rcu_assign_pointer(tun->tfiles[tun->numqueues], tfile);
 	tun->numqueues++;
 
-	if (tfile->detached)
+	if (tfile->detached) {
 		tun_enable_queue(tfile);
-	else
+	} else {
 		sock_hold(&tfile->sk);
+		tun_napi_init(tun, tfile, napi);
+	}
 
 	tun_set_real_num_queues(tun);
 
@@ -692,7 +869,7 @@ out:
 	return err;
 }
 
-static struct tun_struct *__tun_get(struct tun_file *tfile)
+static struct tun_struct *tun_get(struct tun_file *tfile)
 {
 	struct tun_struct *tun;
 
@@ -705,11 +882,6 @@ static struct tun_struct *__tun_get(struct tun_file *tfile)
 	return tun;
 }
 
-static struct tun_struct *tun_get(struct file *file)
-{
-	return __tun_get(file->private_data);
-}
-
 static void tun_put(struct tun_struct *tun)
 {
 	dev_put(tun->dev);
@@ -855,23 +1027,10 @@ static int tun_net_close(struct net_device *dev)
 }
 
 /* Net device start xmit */
-static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
+static void tun_automq_xmit(struct tun_struct *tun, struct sk_buff *skb)
 {
-	struct tun_struct *tun = netdev_priv(dev);
-	int txq = skb->queue_mapping;
-	struct tun_file *tfile;
-	u32 numqueues = 0;
-
-	rcu_read_lock();
-	tfile = rcu_dereference(tun->tfiles[txq]);
-	numqueues = ACCESS_ONCE(tun->numqueues);
-
-	/* Drop packet if interface is not attached */
-	if (txq >= numqueues)
-		goto drop;
-
 #ifdef CONFIG_RPS
-	if (numqueues == 1 && static_key_false(&rps_needed)) {
+	if (tun->numqueues == 1 && static_key_false(&rps_needed)) {
 		/* Select queue was not called for the skbuff, so we extract the
 		 * RPS hash and save it into the flow_table here.
 		 */
@@ -887,6 +1046,37 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 		}
 	}
 #endif
+}
+
+static unsigned int run_ebpf_filter(struct tun_struct *tun,
+				    struct sk_buff *skb,
+				    int len)
+{
+	struct tun_prog *prog = rcu_dereference(tun->filter_prog);
+
+	if (prog)
+		len = bpf_prog_run_clear_cb(prog->prog, skb);
+
+	return len;
+}
+
+/* Net device start xmit */
+static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+	struct tun_struct *tun = netdev_priv(dev);
+	int txq = skb->queue_mapping;
+	struct tun_file *tfile;
+	int len = skb->len;
+
+	rcu_read_lock();
+	tfile = rcu_dereference(tun->tfiles[txq]);
+
+	/* Drop packet if interface is not attached */
+	if (txq >= tun->numqueues)
+		goto drop;
+
+	if (!rcu_dereference(tun->steering_prog))
+		tun_automq_xmit(tun, skb);
 
 	tun_debug(KERN_INFO, tun, "tun_net_xmit %d\n", skb->len);
 
@@ -902,6 +1092,15 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 	    sk_filter(tfile->socket.sk, skb))
 		goto drop;
 
+	len = run_ebpf_filter(tun, skb, len);
+
+	/* Trim extra bytes since we may insert vlan proto & TCI
+	 * in tun_put_user().
+	 */
+	len -= skb_vlan_tag_present(skb) ? sizeof(struct veth) : 0;
+	if (len <= 0 || pskb_trim(skb, len))
+		goto drop;
+
 	if (unlikely(skb_orphan_frags_rx(skb, GFP_ATOMIC)))
 		goto drop;
 
@@ -914,7 +1113,7 @@ static netdev_tx_t tun_net_xmit(struct sk_buff *skb, struct net_device *dev)
 
 	nf_reset(skb);
 
-	if (skb_array_produce(&tfile->tx_array, skb))
+	if (ptr_ring_produce(&tfile->tx_ring, skb))
 		goto drop;
 
 	/* Notify and wake up reader process */
@@ -956,13 +1155,33 @@ static void tun_poll_controller(struct net_device *dev)
 	 * Tun only receives frames when:
 	 * 1) the char device endpoint gets data from user space
 	 * 2) the tun socket gets a sendmsg call from user space
-	 * Since both of those are synchronous operations, we are guaranteed
-	 * never to have pending data when we poll for it
-	 * so there is nothing to do here but return.
+	 * If NAPI is not enabled, since both of those are synchronous
+	 * operations, we are guaranteed never to have pending data when we poll
+	 * for it so there is nothing to do here but return.
 	 * We need this though so netpoll recognizes us as an interface that
 	 * supports polling, which enables bridge devices in virt setups to
 	 * still use netconsole
+	 * If NAPI is enabled, however, we need to schedule polling for all
+	 * queues unless we are using napi_gro_frags(), which we call in
+	 * process context and not in NAPI context.
 	 */
+	struct tun_struct *tun = netdev_priv(dev);
+
+	if (tun->flags & IFF_NAPI) {
+		struct tun_file *tfile;
+		int i;
+
+		if (tun_napi_frags_enabled(tun))
+			return;
+
+		rcu_read_lock();
+		for (i = 0; i < tun->numqueues; i++) {
+			tfile = rcu_dereference(tun->tfiles[i]);
+			if (tfile->napi_enabled)
+				napi_schedule(&tfile->napi);
+		}
+		rcu_read_unlock();
+	}
 	return;
 }
 #endif
@@ -1039,7 +1258,7 @@ static u32 tun_xdp_query(struct net_device *dev)
 	return 0;
 }
 
-static int tun_xdp(struct net_device *dev, struct netdev_xdp *xdp)
+static int tun_xdp(struct net_device *dev, struct netdev_bpf *xdp)
 {
 	switch (xdp->command) {
 	case XDP_SETUP_PROG:
@@ -1067,6 +1286,67 @@ static const struct net_device_ops tun_netdev_ops = {
 	.ndo_get_stats64	= tun_net_get_stats64,
 };
 
+static int tun_xdp_xmit(struct net_device *dev, struct xdp_buff *xdp)
+{
+	struct tun_struct *tun = netdev_priv(dev);
+	struct xdp_buff *buff = xdp->data_hard_start;
+	int headroom = xdp->data - xdp->data_hard_start;
+	struct tun_file *tfile;
+	u32 numqueues;
+	int ret = 0;
+
+	/* Assure headroom is available and buff is properly aligned */
+	if (unlikely(headroom < sizeof(*xdp) || tun_is_xdp_buff(xdp)))
+		return -ENOSPC;
+
+	*buff = *xdp;
+
+	rcu_read_lock();
+
+	numqueues = READ_ONCE(tun->numqueues);
+	if (!numqueues) {
+		ret = -ENOSPC;
+		goto out;
+	}
+
+	tfile = rcu_dereference(tun->tfiles[smp_processor_id() %
+					    numqueues]);
+	/* Encode the XDP flag into lowest bit for consumer to differ
+	 * XDP buffer from sk_buff.
+	 */
+	if (ptr_ring_produce(&tfile->tx_ring, tun_xdp_to_ptr(buff))) {
+		this_cpu_inc(tun->pcpu_stats->tx_dropped);
+		ret = -ENOSPC;
+	}
+
+out:
+	rcu_read_unlock();
+	return ret;
+}
+
+static void tun_xdp_flush(struct net_device *dev)
+{
+	struct tun_struct *tun = netdev_priv(dev);
+	struct tun_file *tfile;
+	u32 numqueues;
+
+	rcu_read_lock();
+
+	numqueues = READ_ONCE(tun->numqueues);
+	if (!numqueues)
+		goto out;
+
+	tfile = rcu_dereference(tun->tfiles[smp_processor_id() %
+					    numqueues]);
+	/* Notify and wake up reader process */
+	if (tfile->flags & TUN_FASYNC)
+		kill_fasync(&tfile->fasync, SIGIO, POLL_IN);
+	tfile->socket.sk->sk_data_ready(tfile->socket.sk);
+
+out:
+	rcu_read_unlock();
+}
+
 static const struct net_device_ops tap_netdev_ops = {
 	.ndo_uninit		= tun_net_uninit,
 	.ndo_open		= tun_net_open,
@@ -1083,7 +1363,9 @@ static const struct net_device_ops tap_netdev_ops = {
 	.ndo_features_check	= passthru_features_check,
 	.ndo_set_rx_headroom	= tun_set_headroom,
 	.ndo_get_stats64	= tun_net_get_stats64,
-	.ndo_xdp		= tun_xdp,
+	.ndo_bpf		= tun_xdp,
+	.ndo_xdp_xmit		= tun_xdp_xmit,
+	.ndo_xdp_flush		= tun_xdp_flush,
 };
 
 static void tun_flow_init(struct tun_struct *tun)
@@ -1094,7 +1376,7 @@ static void tun_flow_init(struct tun_struct *tun)
 		INIT_HLIST_HEAD(&tun->flows[i]);
 
 	tun->ageing_time = TUN_FLOW_EXPIRE;
-	setup_timer(&tun->flow_gc_timer, tun_flow_cleanup, (unsigned long)tun);
+	timer_setup(&tun->flow_gc_timer, tun_flow_cleanup, 0);
 	mod_timer(&tun->flow_gc_timer,
 		  round_jiffies_up(jiffies + tun->ageing_time));
 }
@@ -1146,12 +1428,12 @@ static void tun_net_init(struct net_device *dev)
 /* Character device part */
 
 /* Poll */
-static unsigned int tun_chr_poll(struct file *file, poll_table *wait)
+static __poll_t tun_chr_poll(struct file *file, poll_table *wait)
 {
 	struct tun_file *tfile = file->private_data;
-	struct tun_struct *tun = __tun_get(tfile);
+	struct tun_struct *tun = tun_get(tfile);
 	struct sock *sk;
-	unsigned int mask = 0;
+	__poll_t mask = 0;
 
 	if (!tun)
 		return POLLERR;
@@ -1162,7 +1444,7 @@ static unsigned int tun_chr_poll(struct file *file, poll_table *wait)
 
 	poll_wait(file, sk_sleep(sk), wait);
 
-	if (!skb_array_empty(&tfile->tx_array))
+	if (!ptr_ring_empty(&tfile->tx_ring))
 		mask |= POLLIN | POLLRDNORM;
 
 	if (tun->dev->flags & IFF_UP &&
@@ -1178,6 +1460,64 @@ static unsigned int tun_chr_poll(struct file *file, poll_table *wait)
 	return mask;
 }
 
+static struct sk_buff *tun_napi_alloc_frags(struct tun_file *tfile,
+					    size_t len,
+					    const struct iov_iter *it)
+{
+	struct sk_buff *skb;
+	size_t linear;
+	int err;
+	int i;
+
+	if (it->nr_segs > MAX_SKB_FRAGS + 1)
+		return ERR_PTR(-ENOMEM);
+
+	local_bh_disable();
+	skb = napi_get_frags(&tfile->napi);
+	local_bh_enable();
+	if (!skb)
+		return ERR_PTR(-ENOMEM);
+
+	linear = iov_iter_single_seg_count(it);
+	err = __skb_grow(skb, linear);
+	if (err)
+		goto free;
+
+	skb->len = len;
+	skb->data_len = len - linear;
+	skb->truesize += skb->data_len;
+
+	for (i = 1; i < it->nr_segs; i++) {
+		size_t fragsz = it->iov[i].iov_len;
+		unsigned long offset;
+		struct page *page;
+		void *data;
+
+		if (fragsz == 0 || fragsz > PAGE_SIZE) {
+			err = -EINVAL;
+			goto free;
+		}
+
+		local_bh_disable();
+		data = napi_alloc_frag(fragsz);
+		local_bh_enable();
+		if (!data) {
+			err = -ENOMEM;
+			goto free;
+		}
+
+		page = virt_to_head_page(data);
+		offset = data - page_address(page);
+		skb_fill_page_desc(skb, i - 1, page, offset, fragsz);
+	}
+
+	return skb;
+free:
+	/* frees skb and all frags allocated with napi_alloc_frag() */
+	napi_free_frags(&tfile->napi);
+	return ERR_PTR(err);
+}
+
 /* prepad is the amount to reserve at front.  len is length after that.
  * linear is a hint as to how much to copy (usually headers). */
 static struct sk_buff *tun_alloc_skb(struct tun_file *tfile,
@@ -1315,7 +1655,9 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 
 		xdp.data_hard_start = buf;
 		xdp.data = buf + pad;
+		xdp_set_data_meta_invalid(&xdp);
 		xdp.data_end = xdp.data + len;
+		xdp.rxq = &tfile->xdp_rxq;
 		orig_data = xdp.data;
 		act = bpf_prog_run_xdp(xdp_prog, &xdp);
 
@@ -1326,6 +1668,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 			err = xdp_do_redirect(tun->dev, &xdp, xdp_prog);
 			if (err)
 				goto err_redirect;
+			rcu_read_unlock();
 			return NULL;
 		case XDP_TX:
 			xdp_xmit = true;
@@ -1358,7 +1701,7 @@ static struct sk_buff *tun_build_skb(struct tun_struct *tun,
 	if (xdp_xmit) {
 		skb->dev = tun->dev;
 		generic_xdp_tx(skb, xdp_prog);
-		rcu_read_lock();
+		rcu_read_unlock();
 		return NULL;
 	}
 
@@ -1389,8 +1732,9 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 	int copylen;
 	bool zerocopy = false;
 	int err;
-	u32 rxhash;
+	u32 rxhash = 0;
 	int skb_xdp = 1;
+	bool frags = tun_napi_frags_enabled(tun);
 
 	if (!(tun->dev->flags & IFF_UP))
 		return -EIO;
@@ -1448,7 +1792,7 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 			zerocopy = true;
 	}
 
-	if (tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) {
+	if (!frags && tun_can_build_skb(tun, tfile, len, noblock, zerocopy)) {
 		/* For the packet that is not easy to be processed
 		 * (e.g gso or jumbo packet), we will do it at after
 		 * skb was created with generic XDP routine.
@@ -1469,10 +1813,24 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 				linear = tun16_to_cpu(tun, gso.hdr_len);
 		}
 
-		skb = tun_alloc_skb(tfile, align, copylen, linear, noblock);
+		if (frags) {
+			mutex_lock(&tfile->napi_mutex);
+			skb = tun_napi_alloc_frags(tfile, copylen, from);
+			/* tun_napi_alloc_frags() enforces a layout for the skb.
+			 * If zerocopy is enabled, then this layout will be
+			 * overwritten by zerocopy_sg_from_iter().
+			 */
+			zerocopy = false;
+		} else {
+			skb = tun_alloc_skb(tfile, align, copylen, linear,
+					    noblock);
+		}
+
 		if (IS_ERR(skb)) {
 			if (PTR_ERR(skb) != -EAGAIN)
 				this_cpu_inc(tun->pcpu_stats->rx_dropped);
+			if (frags)
+				mutex_unlock(&tfile->napi_mutex);
 			return PTR_ERR(skb);
 		}
 
@@ -1484,6 +1842,11 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		if (err) {
 			this_cpu_inc(tun->pcpu_stats->rx_dropped);
 			kfree_skb(skb);
+			if (frags) {
+				tfile->napi.skb = NULL;
+				mutex_unlock(&tfile->napi_mutex);
+			}
+
 			return -EFAULT;
 		}
 	}
@@ -1491,6 +1854,11 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 	if (virtio_net_hdr_to_skb(skb, &gso, tun_is_little_endian(tun))) {
 		this_cpu_inc(tun->pcpu_stats->rx_frame_errors);
 		kfree_skb(skb);
+		if (frags) {
+			tfile->napi.skb = NULL;
+			mutex_unlock(&tfile->napi_mutex);
+		}
+
 		return -EINVAL;
 	}
 
@@ -1518,7 +1886,8 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		skb->dev = tun->dev;
 		break;
 	case IFF_TAP:
-		skb->protocol = eth_type_trans(skb, tun->dev);
+		if (!frags)
+			skb->protocol = eth_type_trans(skb, tun->dev);
 		break;
 	}
 
@@ -1551,12 +1920,45 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 		rcu_read_unlock();
 	}
 
-	rxhash = __skb_get_hash_symmetric(skb);
-#ifndef CONFIG_4KSTACKS
-	tun_rx_batched(tun, tfile, skb, more);
-#else
-	netif_rx_ni(skb);
-#endif
+	rcu_read_lock();
+	if (!rcu_dereference(tun->steering_prog))
+		rxhash = __skb_get_hash_symmetric(skb);
+	rcu_read_unlock();
+
+	if (frags) {
+		/* Exercise flow dissector code path. */
+		u32 headlen = eth_get_headlen(skb->data, skb_headlen(skb));
+
+		if (unlikely(headlen > skb_headlen(skb))) {
+			this_cpu_inc(tun->pcpu_stats->rx_dropped);
+			napi_free_frags(&tfile->napi);
+			mutex_unlock(&tfile->napi_mutex);
+			WARN_ON(1);
+			return -ENOMEM;
+		}
+
+		local_bh_disable();
+		napi_gro_frags(&tfile->napi);
+		local_bh_enable();
+		mutex_unlock(&tfile->napi_mutex);
+	} else if (tfile->napi_enabled) {
+		struct sk_buff_head *queue = &tfile->sk.sk_write_queue;
+		int queue_len;
+
+		spin_lock_bh(&queue->lock);
+		__skb_queue_tail(queue, skb);
+		queue_len = skb_queue_len(queue);
+		spin_unlock(&queue->lock);
+
+		if (!more || queue_len > NAPI_POLL_WEIGHT)
+			napi_schedule(&tfile->napi);
+
+		local_bh_enable();
+	} else if (!IS_ENABLED(CONFIG_4KSTACKS)) {
+		tun_rx_batched(tun, tfile, skb, more);
+	} else {
+		netif_rx_ni(skb);
+	}
 
 	stats = get_cpu_ptr(tun->pcpu_stats);
 	u64_stats_update_begin(&stats->syncp);
@@ -1565,15 +1967,17 @@ static ssize_t tun_get_user(struct tun_struct *tun, struct tun_file *tfile,
 	u64_stats_update_end(&stats->syncp);
 	put_cpu_ptr(stats);
 
-	tun_flow_update(tun, rxhash, tfile);
+	if (rxhash)
+		tun_flow_update(tun, rxhash, tfile);
+
 	return total_len;
 }
 
 static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from)
 {
 	struct file *file = iocb->ki_filp;
-	struct tun_struct *tun = tun_get(file);
 	struct tun_file *tfile = file->private_data;
+	struct tun_struct *tun = tun_get(tfile);
 	ssize_t result;
 
 	if (!tun)
@@ -1586,6 +1990,40 @@ static ssize_t tun_chr_write_iter(struct kiocb *iocb, struct iov_iter *from)
 	return result;
 }
 
+static ssize_t tun_put_user_xdp(struct tun_struct *tun,
+				struct tun_file *tfile,
+				struct xdp_buff *xdp,
+				struct iov_iter *iter)
+{
+	int vnet_hdr_sz = 0;
+	size_t size = xdp->data_end - xdp->data;
+	struct tun_pcpu_stats *stats;
+	size_t ret;
+
+	if (tun->flags & IFF_VNET_HDR) {
+		struct virtio_net_hdr gso = { 0 };
+
+		vnet_hdr_sz = READ_ONCE(tun->vnet_hdr_sz);
+		if (unlikely(iov_iter_count(iter) < vnet_hdr_sz))
+			return -EINVAL;
+		if (unlikely(copy_to_iter(&gso, sizeof(gso), iter) !=
+			     sizeof(gso)))
+			return -EFAULT;
+		iov_iter_advance(iter, vnet_hdr_sz - sizeof(gso));
+	}
+
+	ret = copy_to_iter(xdp->data, size, iter) + vnet_hdr_sz;
+
+	stats = get_cpu_ptr(tun->pcpu_stats);
+	u64_stats_update_begin(&stats->syncp);
+	stats->tx_packets++;
+	stats->tx_bytes += ret;
+	u64_stats_update_end(&stats->syncp);
+	put_cpu_ptr(tun->pcpu_stats);
+
+	return ret;
+}
+
 /* Put packet to the user space buffer */
 static ssize_t tun_put_user(struct tun_struct *tun,
 			    struct tun_file *tfile,
@@ -1650,10 +2088,7 @@ static ssize_t tun_put_user(struct tun_struct *tun,
 
 	if (vlan_hlen) {
 		int ret;
-		struct {
-			__be16 h_vlan_proto;
-			__be16 h_vlan_TCI;
-		} veth;
+		struct veth veth;
 
 		veth.h_vlan_proto = skb->vlan_proto;
 		veth.h_vlan_TCI = htons(skb_vlan_tag_get(skb));
@@ -1683,15 +2118,14 @@ done:
 	return total;
 }
 
-static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock,
-				     int *err)
+static void *tun_ring_recv(struct tun_file *tfile, int noblock, int *err)
 {
 	DECLARE_WAITQUEUE(wait, current);
-	struct sk_buff *skb = NULL;
+	void *ptr = NULL;
 	int error = 0;
 
-	skb = skb_array_consume(&tfile->tx_array);
-	if (skb)
+	ptr = ptr_ring_consume(&tfile->tx_ring);
+	if (ptr)
 		goto out;
 	if (noblock) {
 		error = -EAGAIN;
@@ -1702,8 +2136,8 @@ static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock,
 	current->state = TASK_INTERRUPTIBLE;
 
 	while (1) {
-		skb = skb_array_consume(&tfile->tx_array);
-		if (skb)
+		ptr = ptr_ring_consume(&tfile->tx_ring);
+		if (ptr)
 			break;
 		if (signal_pending(current)) {
 			error = -ERESTARTSYS;
@@ -1722,33 +2156,44 @@ static struct sk_buff *tun_ring_recv(struct tun_file *tfile, int noblock,
 
 out:
 	*err = error;
-	return skb;
+	return ptr;
 }
 
 static ssize_t tun_do_read(struct tun_struct *tun, struct tun_file *tfile,
 			   struct iov_iter *to,
-			   int noblock, struct sk_buff *skb)
+			   int noblock, void *ptr)
 {
 	ssize_t ret;
 	int err;
 
 	tun_debug(KERN_INFO, tun, "tun_do_read\n");
 
-	if (!iov_iter_count(to))
+	if (!iov_iter_count(to)) {
+		tun_ptr_free(ptr);
 		return 0;
+	}
 
-	if (!skb) {
+	if (!ptr) {
 		/* Read frames from ring */
-		skb = tun_ring_recv(tfile, noblock, &err);
-		if (!skb)
+		ptr = tun_ring_recv(tfile, noblock, &err);
+		if (!ptr)
 			return err;
 	}
 
-	ret = tun_put_user(tun, tfile, skb, to);
-	if (unlikely(ret < 0))
-		kfree_skb(skb);
-	else
-		consume_skb(skb);
+	if (tun_is_xdp_buff(ptr)) {
+		struct xdp_buff *xdp = tun_ptr_to_xdp(ptr);
+
+		ret = tun_put_user_xdp(tun, tfile, xdp, to);
+		put_page(virt_to_head_page(xdp->data));
+	} else {
+		struct sk_buff *skb = ptr;
+
+		ret = tun_put_user(tun, tfile, skb, to);
+		if (unlikely(ret < 0))
+			kfree_skb(skb);
+		else
+			consume_skb(skb);
+	}
 
 	return ret;
 }
@@ -1757,7 +2202,7 @@ static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
 {
 	struct file *file = iocb->ki_filp;
 	struct tun_file *tfile = file->private_data;
-	struct tun_struct *tun = __tun_get(tfile);
+	struct tun_struct *tun = tun_get(tfile);
 	ssize_t len = iov_iter_count(to), ret;
 
 	if (!tun)
@@ -1770,6 +2215,39 @@ static ssize_t tun_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
 	return ret;
 }
 
+static void tun_prog_free(struct rcu_head *rcu)
+{
+	struct tun_prog *prog = container_of(rcu, struct tun_prog, rcu);
+
+	bpf_prog_destroy(prog->prog);
+	kfree(prog);
+}
+
+static int __tun_set_ebpf(struct tun_struct *tun,
+			  struct tun_prog __rcu **prog_p,
+			  struct bpf_prog *prog)
+{
+	struct tun_prog *old, *new = NULL;
+
+	if (prog) {
+		new = kmalloc(sizeof(*new), GFP_KERNEL);
+		if (!new)
+			return -ENOMEM;
+		new->prog = prog;
+	}
+
+	spin_lock_bh(&tun->lock);
+	old = rcu_dereference_protected(*prog_p,
+					lockdep_is_held(&tun->lock));
+	rcu_assign_pointer(*prog_p, new);
+	spin_unlock_bh(&tun->lock);
+
+	if (old)
+		call_rcu(&old->rcu, tun_prog_free);
+
+	return 0;
+}
+
 static void tun_free_netdev(struct net_device *dev)
 {
 	struct tun_struct *tun = netdev_priv(dev);
@@ -1778,6 +2256,8 @@ static void tun_free_netdev(struct net_device *dev)
 	free_percpu(tun->pcpu_stats);
 	tun_flow_uninit(tun);
 	security_tun_dev_free_security(tun->security);
+	__tun_set_ebpf(tun, &tun->steering_prog, NULL);
+	__tun_set_ebpf(tun, &tun->filter_prog, NULL);
 }
 
 static void tun_setup(struct net_device *dev)
@@ -1834,7 +2314,7 @@ static int tun_sendmsg(struct socket *sock, struct msghdr *m, size_t total_len)
 {
 	int ret;
 	struct tun_file *tfile = container_of(sock, struct tun_file, socket);
-	struct tun_struct *tun = __tun_get(tfile);
+	struct tun_struct *tun = tun_get(tfile);
 
 	if (!tun)
 		return -EBADFD;
@@ -1850,23 +2330,25 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len,
 		       int flags)
 {
 	struct tun_file *tfile = container_of(sock, struct tun_file, socket);
-	struct tun_struct *tun = __tun_get(tfile);
+	struct tun_struct *tun = tun_get(tfile);
+	void *ptr = m->msg_control;
 	int ret;
 
-	if (!tun)
-		return -EBADFD;
+	if (!tun) {
+		ret = -EBADFD;
+		goto out_free;
+	}
 
 	if (flags & ~(MSG_DONTWAIT|MSG_TRUNC|MSG_ERRQUEUE)) {
 		ret = -EINVAL;
-		goto out;
+		goto out_put_tun;
 	}
 	if (flags & MSG_ERRQUEUE) {
 		ret = sock_recv_errqueue(sock->sk, m, total_len,
 					 SOL_PACKET, TUN_TX_TIMESTAMP);
 		goto out;
 	}
-	ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT,
-			  m->msg_control);
+	ret = tun_do_read(tun, tfile, &m->msg_iter, flags & MSG_DONTWAIT, ptr);
 	if (ret > (ssize_t)total_len) {
 		m->msg_flags |= MSG_TRUNC;
 		ret = flags & MSG_TRUNC ? ret : total_len;
@@ -1874,6 +2356,26 @@ static int tun_recvmsg(struct socket *sock, struct msghdr *m, size_t total_len,
 out:
 	tun_put(tun);
 	return ret;
+
+out_put_tun:
+	tun_put(tun);
+out_free:
+	tun_ptr_free(ptr);
+	return ret;
+}
+
+static int tun_ptr_peek_len(void *ptr)
+{
+	if (likely(ptr)) {
+		if (tun_is_xdp_buff(ptr)) {
+			struct xdp_buff *xdp = tun_ptr_to_xdp(ptr);
+
+			return xdp->data_end - xdp->data;
+		}
+		return __skb_array_len_with_tag(ptr);
+	} else {
+		return 0;
+	}
 }
 
 static int tun_peek_len(struct socket *sock)
@@ -1882,11 +2384,11 @@ static int tun_peek_len(struct socket *sock)
 	struct tun_struct *tun;
 	int ret = 0;
 
-	tun = __tun_get(tfile);
+	tun = tun_get(tfile);
 	if (!tun)
 		return 0;
 
-	ret = skb_array_peek_len(&tfile->tx_array);
+	ret = PTR_RING_PEEK_CALL(&tfile->tx_ring, tun_ptr_peek_len);
 	tun_put(tun);
 
 	return ret;
@@ -1962,6 +2464,15 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 	if (tfile->detached)
 		return -EINVAL;
 
+	if ((ifr->ifr_flags & IFF_NAPI_FRAGS)) {
+		if (!capable(CAP_NET_ADMIN))
+			return -EPERM;
+
+		if (!(ifr->ifr_flags & IFF_NAPI) ||
+		    (ifr->ifr_flags & TUN_TYPE_MASK) != IFF_TAP)
+			return -EINVAL;
+	}
+
 	dev = __dev_get_by_name(net, ifr->ifr_name);
 	if (dev) {
 		if (ifr->ifr_flags & IFF_TUN_EXCL)
@@ -1983,7 +2494,8 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 		if (err < 0)
 			return err;
 
-		err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER);
+		err = tun_attach(tun, file, ifr->ifr_flags & IFF_NOFILTER,
+				 ifr->ifr_flags & IFF_NAPI);
 		if (err < 0)
 			return err;
 
@@ -2047,6 +2559,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 		tun->filter_attached = false;
 		tun->sndbuf = tfile->socket.sk->sk_sndbuf;
 		tun->rx_batched = 0;
+		RCU_INIT_POINTER(tun->steering_prog, NULL);
 
 		tun->pcpu_stats = netdev_alloc_pcpu_stats(struct tun_pcpu_stats);
 		if (!tun->pcpu_stats) {
@@ -2072,7 +2585,7 @@ static int tun_set_iff(struct net *net, struct file *file, struct ifreq *ifr)
 				       NETIF_F_HW_VLAN_STAG_TX);
 
 		INIT_LIST_HEAD(&tun->disabled);
-		err = tun_attach(tun, file, false);
+		err = tun_attach(tun, file, false, ifr->ifr_flags & IFF_NAPI);
 		if (err < 0)
 			goto err_free_flow;
 
@@ -2144,6 +2657,8 @@ static int set_offload(struct tun_struct *tun, unsigned long arg)
 				features |= NETIF_F_TSO6;
 			arg &= ~(TUN_F_TSO4|TUN_F_TSO6);
 		}
+
+		arg &= ~TUN_F_UFO;
 	}
 
 	/* This gives the user a way to test for new features in future by
@@ -2222,7 +2737,7 @@ static int tun_set_queue(struct file *file, struct ifreq *ifr)
 		ret = security_tun_dev_attach_queue(tun->security);
 		if (ret < 0)
 			goto unlock;
-		ret = tun_attach(tun, file, false);
+		ret = tun_attach(tun, file, false, tun->flags & IFF_NAPI);
 	} else if (ifr->ifr_flags & IFF_DETACH_QUEUE) {
 		tun = rtnl_dereference(tfile->tun);
 		if (!tun || !(tun->flags & IFF_MULTI_QUEUE) || tfile->detached)
@@ -2237,6 +2752,26 @@ unlock:
 	return ret;
 }
 
+static int tun_set_ebpf(struct tun_struct *tun, struct tun_prog **prog_p,
+			void __user *data)
+{
+	struct bpf_prog *prog;
+	int fd;
+
+	if (copy_from_user(&fd, data, sizeof(fd)))
+		return -EFAULT;
+
+	if (fd == -1) {
+		prog = NULL;
+	} else {
+		prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_SOCKET_FILTER);
+		if (IS_ERR(prog))
+			return PTR_ERR(prog);
+	}
+
+	return __tun_set_ebpf(tun, prog_p, prog);
+}
+
 static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 			    unsigned long arg, int ifreq_len)
 {
@@ -2271,7 +2806,7 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 	ret = 0;
 	rtnl_lock();
 
-	tun = __tun_get(tfile);
+	tun = tun_get(tfile);
 	if (cmd == TUNSETIFF) {
 		ret = -EEXIST;
 		if (tun)
@@ -2513,6 +3048,14 @@ static long __tun_chr_ioctl(struct file *file, unsigned int cmd,
 		ret = 0;
 		break;
 
+	case TUNSETSTEERINGEBPF:
+		ret = tun_set_ebpf(tun, &tun->steering_prog, argp);
+		break;
+
+	case TUNSETFILTEREBPF:
+		ret = tun_set_ebpf(tun, &tun->filter_prog, argp);
+		break;
+
 	default:
 		ret = -EINVAL;
 		break;
@@ -2609,6 +3152,8 @@ static int tun_chr_open(struct inode *inode, struct file * file)
 
 	sock_set_flag(&tfile->sk, SOCK_ZEROCOPY);
 
+	memset(&tfile->tx_ring, 0, sizeof(tfile->tx_ring));
+
 	return 0;
 }
 
@@ -2622,15 +3167,16 @@ static int tun_chr_close(struct inode *inode, struct file *file)
 }
 
 #ifdef CONFIG_PROC_FS
-static void tun_chr_show_fdinfo(struct seq_file *m, struct file *f)
+static void tun_chr_show_fdinfo(struct seq_file *m, struct file *file)
 {
+	struct tun_file *tfile = file->private_data;
 	struct tun_struct *tun;
 	struct ifreq ifr;
 
 	memset(&ifr, 0, sizeof(ifr));
 
 	rtnl_lock();
-	tun = tun_get(f);
+	tun = tun_get(tfile);
 	if (tun)
 		tun_get_iff(current->nsproxy->net_ns, tun, &ifr);
 	rtnl_unlock();
@@ -2755,25 +3301,26 @@ static int tun_queue_resize(struct tun_struct *tun)
 {
 	struct net_device *dev = tun->dev;
 	struct tun_file *tfile;
-	struct skb_array **arrays;
+	struct ptr_ring **rings;
 	int n = tun->numqueues + tun->numdisabled;
 	int ret, i;
 
-	arrays = kmalloc_array(n, sizeof(*arrays), GFP_KERNEL);
-	if (!arrays)
+	rings = kmalloc_array(n, sizeof(*rings), GFP_KERNEL);
+	if (!rings)
 		return -ENOMEM;
 
 	for (i = 0; i < tun->numqueues; i++) {
 		tfile = rtnl_dereference(tun->tfiles[i]);
-		arrays[i] = &tfile->tx_array;
+		rings[i] = &tfile->tx_ring;
 	}
 	list_for_each_entry(tfile, &tun->disabled, next)
-		arrays[i++] = &tfile->tx_array;
+		rings[i++] = &tfile->tx_ring;
 
-	ret = skb_array_resize_multiple(arrays, n,
-					dev->tx_queue_len, GFP_KERNEL);
+	ret = ptr_ring_resize_multiple(rings, n,
+				       dev->tx_queue_len, GFP_KERNEL,
+				       tun_ptr_free);
 
-	kfree(arrays);
+	kfree(rings);
 	return ret;
 }
 
@@ -2859,7 +3406,7 @@ struct socket *tun_get_socket(struct file *file)
 }
 EXPORT_SYMBOL_GPL(tun_get_socket);
 
-struct skb_array *tun_get_skb_array(struct file *file)
+struct ptr_ring *tun_get_tx_ring(struct file *file)
 {
 	struct tun_file *tfile;
 
@@ -2868,9 +3415,9 @@ struct skb_array *tun_get_skb_array(struct file *file)
 	tfile = file->private_data;
 	if (!tfile)
 		return ERR_PTR(-EBADFD);
-	return &tfile->tx_array;
+	return &tfile->tx_ring;
 }
-EXPORT_SYMBOL_GPL(tun_get_skb_array);
+EXPORT_SYMBOL_GPL(tun_get_tx_ring);
 
 module_init(tun_init);
 module_exit(tun_cleanup);