11 files changed, 415 insertions, 150 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 5231652a95d9..6932a42e41a2 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -35,11 +35,78 @@
 #include <net/sctp/checksum.h>
 
 #include "datapath.h"
+#include "flow.h"
 #include "vport.h"
 
 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			      struct sw_flow_key *key,
 			      const struct nlattr *attr, int len);
 
+struct deferred_action {
+	struct sk_buff *skb;
+	const struct nlattr *actions;
+
+	/* Store pkt_key clone when creating deferred action. */
+	struct sw_flow_key pkt_key;
+};
+
+#define DEFERRED_ACTION_FIFO_SIZE 10
+struct action_fifo {
+	int head;
+	int tail;
+	/* Deferred action fifo queue storage. */
+	struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
+};
+
+static struct action_fifo __percpu *action_fifos;
+static DEFINE_PER_CPU(int, exec_actions_level);
+
+static void action_fifo_init(struct action_fifo *fifo)
+{
+	fifo->head = 0;
+	fifo->tail = 0;
+}
+
+static bool action_fifo_is_empty(struct action_fifo *fifo)
+{
+	return (fifo->head == fifo->tail);
+}
+
+static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
+{
+	if (action_fifo_is_empty(fifo))
+		return NULL;
+
+	return &fifo->fifo[fifo->tail++];
+}
+
+static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
+{
+	if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
+		return NULL;
+
+	return &fifo->fifo[fifo->head++];
+}
+
+/* Return true if fifo is not full */
+static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
+						    struct sw_flow_key *key,
+						    const struct nlattr *attr)
+{
+	struct action_fifo *fifo;
+	struct deferred_action *da;
+
+	fifo = this_cpu_ptr(action_fifos);
+	da = action_fifo_put(fifo);
+	if (da) {
+		da->skb = skb;
+		da->actions = attr;
+		da->pkt_key = *key;
+	}
+
+	return da;
+}
+
 static int make_writable(struct sk_buff *skb, int write_len)
 {
 	if (!pskb_may_pull(skb, write_len))
@@ -410,16 +477,14 @@ static int do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
 }
 
 static int output_userspace(struct datapath *dp, struct sk_buff *skb,
-			    const struct nlattr *attr)
+			    struct sw_flow_key *key, const struct nlattr *attr)
 {
 	struct dp_upcall_info upcall;
 	const struct nlattr *a;
 	int rem;
 
-	BUG_ON(!OVS_CB(skb)->pkt_key);
-
 	upcall.cmd = OVS_PACKET_CMD_ACTION;
-	upcall.key = OVS_CB(skb)->pkt_key;
+	upcall.key = key;
 	upcall.userdata = NULL;
 	upcall.portid = 0;
 
@@ -445,11 +510,10 @@ static bool last_action(const struct nlattr *a, int rem)
 }
 
 static int sample(struct datapath *dp, struct sk_buff *skb,
-		  const struct nlattr *attr)
+		  struct sw_flow_key *key, const struct nlattr *attr)
 {
 	const struct nlattr *acts_list = NULL;
 	const struct nlattr *a;
-	struct sk_buff *sample_skb;
 	int rem;
 
 	for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
@@ -469,31 +533,47 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
 	rem = nla_len(acts_list);
 	a = nla_data(acts_list);
 
-	/* Actions list is either empty or only contains a single user-space
-	 * action, the latter being a special case as it is the only known
-	 * usage of the sample action.
-	 * In these special cases don't clone the skb as there are no
-	 * side-effects in the nested actions.
-	 * Otherwise, clone in case the nested actions have side effects.
+	/* Actions list is empty, do nothing */
+	if (unlikely(!rem))
+		return 0;
+
+	/* The only known usage of sample action is having a single user-space
+	 * action. Treat this usage as a special case.
+	 * The output_userspace() should clone the skb to be sent to the
+	 * user space. This skb will be consumed by its caller.
 	 */
-	if (likely(rem == 0 || (nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
-				last_action(a, rem)))) {
-		sample_skb = skb;
-		skb_get(skb);
-	} else {
-		sample_skb = skb_clone(skb, GFP_ATOMIC);
-		if (!sample_skb) /* Skip sample action when out of memory. */
-			return 0;
+	if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
+		   last_action(a, rem)))
+		return output_userspace(dp, skb, key, a);
+
+	skb = skb_clone(skb, GFP_ATOMIC);
+	if (!skb)
+		/* Skip the sample action when out of memory. */
+		return 0;
+
+	if (!add_deferred_actions(skb, key, a)) {
+		if (net_ratelimit())
+			pr_warn("%s: deferred actions limit reached, dropping sample action\n",
+				ovs_dp_name(dp));
+
+		kfree_skb(skb);
 	}
+	return 0;
+}
 
-	/* Note that do_execute_actions() never consumes skb.
-	 * In the case where skb has been cloned above it is the clone that
-	 * is consumed.  Otherwise the skb_get(skb) call prevents
-	 * consumption by do_execute_actions(). Thus, it is safe to simply
-	 * return the error code and let the caller (also
-	 * do_execute_actions()) free skb on error.
-	 */
-	return do_execute_actions(dp, sample_skb, a, rem);
+static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
+			 const struct nlattr *attr)
+{
+	struct ovs_action_hash *hash_act = nla_data(attr);
+	u32 hash = 0;
+
+	/* OVS_HASH_ALG_L4 is the only possible hash algorithm.  */
+	hash = skb_get_hash(skb);
+	hash = jhash_1word(hash, hash_act->hash_basis);
+	if (!hash)
+		hash = 0x1;
+
+	key->ovs_flow_hash = hash;
 }
 
 static int execute_set_action(struct sk_buff *skb,
@@ -511,7 +591,7 @@ static int execute_set_action(struct sk_buff *skb,
 		break;
 
 	case OVS_KEY_ATTR_IPV4_TUNNEL:
-		OVS_CB(skb)->tun_key = nla_data(nested_attr);
+		OVS_CB(skb)->egress_tun_key = nla_data(nested_attr);
 		break;
 
 	case OVS_KEY_ATTR_ETHERNET:
@@ -542,8 +622,47 @@ static int execute_set_action(struct sk_buff *skb,
 	return err;
 }
 
+static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
+			  struct sw_flow_key *key,
+			  const struct nlattr *a, int rem)
+{
+	struct deferred_action *da;
+	int err;
+
+	err = ovs_flow_key_update(skb, key);
+	if (err)
+		return err;
+
+	if (!last_action(a, rem)) {
+		/* Recirc action is the not the last action
+		 * of the action list, need to clone the skb.
+		 */
+		skb = skb_clone(skb, GFP_ATOMIC);
+
+		/* Skip the recirc action when out of memory, but
+		 * continue on with the rest of the action list.
+		 */
+		if (!skb)
+			return 0;
+	}
+
+	da = add_deferred_actions(skb, key, NULL);
+	if (da) {
+		da->pkt_key.recirc_id = nla_get_u32(a);
+	} else {
+		kfree_skb(skb);
+
+		if (net_ratelimit())
+			pr_warn("%s: deferred action limit reached, drop recirc action\n",
+				ovs_dp_name(dp));
+	}
+
+	return 0;
+}
+
 /* Execute a list of actions against 'skb'. */
 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			      struct sw_flow_key *key,
 			      const struct nlattr *attr, int len)
 {
 	/* Every output action needs a separate clone of 'skb', but the common
@@ -569,7 +688,11 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 			break;
 
 		case OVS_ACTION_ATTR_USERSPACE:
-			output_userspace(dp, skb, a);
+			output_userspace(dp, skb, key, a);
+			break;
+
+		case OVS_ACTION_ATTR_HASH:
+			execute_hash(skb, key, a);
 			break;
 
 		case OVS_ACTION_ATTR_PUSH_VLAN:
@@ -582,12 +705,23 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 			err = pop_vlan(skb);
 			break;
 
+		case OVS_ACTION_ATTR_RECIRC:
+			err = execute_recirc(dp, skb, key, a, rem);
+			if (last_action(a, rem)) {
+				/* If this is the last action, the skb has
+				 * been consumed or freed.
+				 * Return immediately.
+				 */
+				return err;
+			}
+			break;
+
 		case OVS_ACTION_ATTR_SET:
 			err = execute_set_action(skb, nla_data(a));
 			break;
 
 		case OVS_ACTION_ATTR_SAMPLE:
-			err = sample(dp, skb, a);
+			err = sample(dp, skb, key, a);
 			if (unlikely(err)) /* skb already freed. */
 				return err;
 			break;
@@ -607,11 +741,63 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
 	return 0;
 }
 
+static void process_deferred_actions(struct datapath *dp)
+{
+	struct action_fifo *fifo = this_cpu_ptr(action_fifos);
+
+	/* Do not touch the FIFO in case there is no deferred actions. */
+	if (action_fifo_is_empty(fifo))
+		return;
+
+	/* Finishing executing all deferred actions. */
+	do {
+		struct deferred_action *da = action_fifo_get(fifo);
+		struct sk_buff *skb = da->skb;
+		struct sw_flow_key *key = &da->pkt_key;
+		const struct nlattr *actions = da->actions;
+
+		if (actions)
+			do_execute_actions(dp, skb, key, actions,
+					   nla_len(actions));
+		else
+			ovs_dp_process_packet(skb, key);
+	} while (!action_fifo_is_empty(fifo));
+
+	/* Reset FIFO for the next packet.  */
+	action_fifo_init(fifo);
+}
+
 /* Execute a list of actions against 'skb'. */
-int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb)
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			struct sw_flow_key *key)
 {
-	struct sw_flow_actions *acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
+	int level = this_cpu_read(exec_actions_level);
+	struct sw_flow_actions *acts;
+	int err;
+
+	acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
+
+	this_cpu_inc(exec_actions_level);
+	err = do_execute_actions(dp, skb, key,
+				 acts->actions, acts->actions_len);
 
-	OVS_CB(skb)->tun_key = NULL;
-	return do_execute_actions(dp, skb, acts->actions, acts->actions_len);
+	if (!level)
+		process_deferred_actions(dp);
+
+	this_cpu_dec(exec_actions_level);
+	return err;
+}
+
+int action_fifos_init(void)
+{
+	action_fifos = alloc_percpu(struct action_fifo);
+	if (!action_fifos)
+		return -ENOMEM;
+
+	return 0;
+}
+
+void action_fifos_exit(void)
+{
+	free_percpu(action_fifos);
 }
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index 64dc864a417f..9e3a2fae6a8f 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -157,7 +157,7 @@ static struct datapath *get_dp(struct net *net, int dp_ifindex)
 }
 
 /* Must be called with rcu_read_lock or ovs_mutex. */
-static const char *ovs_dp_name(const struct datapath *dp)
+const char *ovs_dp_name(const struct datapath *dp)
 {
 	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
 	return vport->ops->get_name(vport);
@@ -238,32 +238,25 @@ void ovs_dp_detach_port(struct vport *p)
 }
 
 /* Must be called with rcu_read_lock. */
-void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
+void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
 {
+	const struct vport *p = OVS_CB(skb)->input_vport;
 	struct datapath *dp = p->dp;
 	struct sw_flow *flow;
 	struct dp_stats_percpu *stats;
-	struct sw_flow_key key;
 	u64 *stats_counter;
 	u32 n_mask_hit;
-	int error;
 
 	stats = this_cpu_ptr(dp->stats_percpu);
 
-	/* Extract flow from 'skb' into 'key'. */
-	error = ovs_flow_extract(skb, p->port_no, &key);
-	if (unlikely(error)) {
-		kfree_skb(skb);
-		return;
-	}
-
 	/* Look up flow. */
-	flow = ovs_flow_tbl_lookup_stats(&dp->table, &key, &n_mask_hit);
+	flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit);
 	if (unlikely(!flow)) {
 		struct dp_upcall_info upcall;
+		int error;
 
 		upcall.cmd = OVS_PACKET_CMD_MISS;
-		upcall.key = &key;
+		upcall.key = key;
 		upcall.userdata = NULL;
 		upcall.portid = ovs_vport_find_upcall_portid(p, skb);
 		error = ovs_dp_upcall(dp, skb, &upcall);
@@ -276,10 +269,9 @@ void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb)
 	}
 
 	OVS_CB(skb)->flow = flow;
-	OVS_CB(skb)->pkt_key = &key;
 
-	ovs_flow_stats_update(OVS_CB(skb)->flow, key.tp.flags, skb);
-	ovs_execute_actions(dp, skb);
+	ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb);
+	ovs_execute_actions(dp, skb, key);
 	stats_counter = &stats->n_hit;
 
 out:
@@ -516,6 +508,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 	struct sw_flow *flow;
 	struct datapath *dp;
 	struct ethhdr *eth;
+	struct vport *input_vport;
 	int len;
 	int err;
 
@@ -550,13 +543,11 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 	if (IS_ERR(flow))
 		goto err_kfree_skb;
 
-	err = ovs_flow_extract(packet, -1, &flow->key);
+	err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
+					     &flow->key);
 	if (err)
 		goto err_flow_free;
 
-	err = ovs_nla_get_flow_metadata(flow, a[OVS_PACKET_ATTR_KEY]);
-	if (err)
-		goto err_flow_free;
 	acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_PACKET_ATTR_ACTIONS]));
 	err = PTR_ERR(acts);
 	if (IS_ERR(acts))
@@ -569,7 +560,6 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 		goto err_flow_free;
 
 	OVS_CB(packet)->flow = flow;
-	OVS_CB(packet)->pkt_key = &flow->key;
 	packet->priority = flow->key.phy.priority;
 	packet->mark = flow->key.phy.skb_mark;
 
@@ -579,8 +569,17 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 	if (!dp)
 		goto err_unlock;
 
+	input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port);
+	if (!input_vport)
+		input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
+
+	if (!input_vport)
+		goto err_unlock;
+
+	OVS_CB(packet)->input_vport = input_vport;
+
 	local_bh_disable();
-	err = ovs_execute_actions(dp, packet);
+	err = ovs_execute_actions(dp, packet, &flow->key);
 	local_bh_enable();
 	rcu_read_unlock();
 
@@ -2067,10 +2066,14 @@ static int __init dp_init(void)
 
 	pr_info("Open vSwitch switching datapath\n");
 
-	err = ovs_internal_dev_rtnl_link_register();
+	err = action_fifos_init();
 	if (err)
 		goto error;
 
+	err = ovs_internal_dev_rtnl_link_register();
+	if (err)
+		goto error_action_fifos_exit;
+
 	err = ovs_flow_init();
 	if (err)
 		goto error_unreg_rtnl_link;
@@ -2103,6 +2106,8 @@ error_flow_exit:
 	ovs_flow_exit();
 error_unreg_rtnl_link:
 	ovs_internal_dev_rtnl_link_unregister();
+error_action_fifos_exit:
+	action_fifos_exit();
 error:
 	return err;
 }
@@ -2116,6 +2121,7 @@ static void dp_cleanup(void)
 	ovs_vport_exit();
 	ovs_flow_exit();
 	ovs_internal_dev_rtnl_link_unregister();
+	action_fifos_exit();
 }
 
 module_init(dp_init);
diff --git a/net/openvswitch/datapath.h b/net/openvswitch/datapath.h
index 701b5738c38a..ac3f3df96961 100644
--- a/net/openvswitch/datapath.h
+++ b/net/openvswitch/datapath.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2012 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -95,14 +95,15 @@ struct datapath {
 /**
  * struct ovs_skb_cb - OVS data in skb CB
  * @flow: The flow associated with this packet.  May be %NULL if no flow.
- * @pkt_key: The flow information extracted from the packet.  Must be nonnull.
- * @tun_key: Key for the tunnel that encapsulated this packet. NULL if the
- * packet is not being tunneled.
+ * @egress_tun_key: Tunnel information about this packet on egress path.
+ * NULL if the packet is not being tunneled.
+ * @input_vport: The original vport packet came in on. This value is cached
+ * when a packet is received by OVS.
  */
 struct ovs_skb_cb {
 	struct sw_flow		*flow;
-	struct sw_flow_key	*pkt_key;
-	struct ovs_key_ipv4_tunnel  *tun_key;
+	struct vport		*input_vport;
+	struct ovs_key_ipv4_tunnel  *egress_tun_key;
 };
 #define OVS_CB(skb) ((struct ovs_skb_cb *)(skb)->cb)
 
@@ -183,17 +184,23 @@ static inline struct vport *ovs_vport_ovsl(const struct datapath *dp, int port_n
 extern struct notifier_block ovs_dp_device_notifier;
 extern struct genl_family dp_vport_genl_family;
 
-void ovs_dp_process_received_packet(struct vport *, struct sk_buff *);
+void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key);
 void ovs_dp_detach_port(struct vport *);
 int ovs_dp_upcall(struct datapath *, struct sk_buff *,
 		  const struct dp_upcall_info *);
 
+const char *ovs_dp_name(const struct datapath *dp);
 struct sk_buff *ovs_vport_cmd_build_info(struct vport *, u32 pid, u32 seq,
 					 u8 cmd);
 
-int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb);
+int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
+			struct sw_flow_key *);
+
 void ovs_dp_notify_wq(struct work_struct *work);
 
+int action_fifos_init(void);
+void action_fifos_exit(void);
+
 #define OVS_NLERR(fmt, ...)					\
 do {								\
 	if (net_ratelimit())					\
diff --git a/net/openvswitch/flow.c b/net/openvswitch/flow.c
index d07ab538fc9d..4010423f2831 100644
--- a/net/openvswitch/flow.c
+++ b/net/openvswitch/flow.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -16,8 +16,6 @@
  * 02110-1301, USA
  */
 
-#include "flow.h"
-#include "datapath.h"
 #include <linux/uaccess.h>
 #include <linux/netdevice.h>
 #include <linux/etherdevice.h>
@@ -46,6 +44,10 @@
 #include <net/ipv6.h>
 #include <net/ndisc.h>
 
+#include "datapath.h"
+#include "flow.h"
+#include "flow_netlink.h"
+
 u64 ovs_flow_used_time(unsigned long flow_jiffies)
 {
 	struct timespec cur_ts;
@@ -89,7 +91,7 @@ void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
 			 * allocated stats as we have already locked them.
 			 */
 			if (likely(flow->stats_last_writer != NUMA_NO_NODE)
-			    && likely(!rcu_dereference(flow->stats[node]))) {
+			    && likely(!rcu_access_pointer(flow->stats[node]))) {
 				/* Try to allocate node-specific stats. */
 				struct flow_stats *new_stats;
 
@@ -420,10 +422,9 @@ invalid:
 }
 
 /**
- * ovs_flow_extract - extracts a flow key from an Ethernet frame.
+ * key_extract - extracts a flow key from an Ethernet frame.
  * @skb: sk_buff that contains the frame, with skb->data pointing to the
  * Ethernet header
- * @in_port: port number on which @skb was received.
  * @key: output flow key
  *
  * The caller must ensure that skb->len >= ETH_HLEN.
@@ -442,19 +443,11 @@ invalid:
  *      of a correct length, otherwise the same as skb->network_header.
  *      For other key->eth.type values it is left untouched.
  */
-int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
+static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
 {
 	int error;
 	struct ethhdr *eth;
 
-	memset(key, 0, sizeof(*key));
-
-	key->phy.priority = skb->priority;
-	if (OVS_CB(skb)->tun_key)
-		memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
-	key->phy.in_port = in_port;
-	key->phy.skb_mark = skb->mark;
-
 	skb_reset_mac_header(skb);
 
 	/* Link layer.  We are guaranteed to have at least the 14 byte Ethernet
@@ -610,6 +603,40 @@ int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
 			}
 		}
 	}
-
 	return 0;
 }
+
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
+{
+	return key_extract(skb, key);
+}
+
+int ovs_flow_key_extract(struct ovs_key_ipv4_tunnel *tun_key,
+			 struct sk_buff *skb, struct sw_flow_key *key)
+{
+	/* Extract metadata from packet. */
+	memset(key, 0, sizeof(*key));
+	if (tun_key)
+		memcpy(&key->tun_key, tun_key, sizeof(key->tun_key));
+
+	key->phy.priority = skb->priority;
+	key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
+	key->phy.skb_mark = skb->mark;
+
+	return key_extract(skb, key);
+}
+
+int ovs_flow_key_extract_userspace(const struct nlattr *attr,
+				   struct sk_buff *skb,
+				   struct sw_flow_key *key)
+{
+	int err;
+
+	memset(key, 0, sizeof(*key));
+	/* Extract metadata from netlink attributes. */
+	err = ovs_nla_get_flow_metadata(attr, key);
+	if (err)
+		return err;
+
+	return key_extract(skb, key);
+}
diff --git a/net/openvswitch/flow.h b/net/openvswitch/flow.h
index 5e5aaed3a85b..0f5db4ec565d 100644
--- a/net/openvswitch/flow.h
+++ b/net/openvswitch/flow.h
@@ -72,6 +72,8 @@ struct sw_flow_key {
 		u32	skb_mark;	/* SKB mark. */
 		u16	in_port;	/* Input switch port (or DP_MAX_PORTS). */
 	} __packed phy; /* Safe when right after 'tun_key'. */
+	u32 ovs_flow_hash;		/* Datapath computed hash value.  */
+	u32 recirc_id;			/* Recirculation ID.  */
 	struct {
 		u8     src[ETH_ALEN];	/* Ethernet source address. */
 		u8     dst[ETH_ALEN];	/* Ethernet destination address. */
@@ -187,6 +189,12 @@ void ovs_flow_stats_get(const struct sw_flow *, struct ovs_flow_stats *,
 void ovs_flow_stats_clear(struct sw_flow *);
 u64 ovs_flow_used_time(unsigned long flow_jiffies);
 
-int ovs_flow_extract(struct sk_buff *, u16 in_port, struct sw_flow_key *);
+int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key);
+int ovs_flow_key_extract(struct ovs_key_ipv4_tunnel *tun_key,
+			 struct sk_buff *skb, struct sw_flow_key *key);
+/* Extract key from packet coming from userspace. */
+int ovs_flow_key_extract_userspace(const struct nlattr *attr,
+				   struct sk_buff *skb,
+				   struct sw_flow_key *key);
 
 #endif /* flow.h */
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index d757848da89c..f4c8daa73965 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -251,6 +251,8 @@ static const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
 	[OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
 	[OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
 	[OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
+	[OVS_KEY_ATTR_RECIRC_ID] = sizeof(u32),
+	[OVS_KEY_ATTR_DP_HASH] = sizeof(u32),
 	[OVS_KEY_ATTR_TUNNEL] = -1,
 };
 
@@ -454,6 +456,20 @@ static int ipv4_tun_to_nlattr(struct sk_buff *skb,
 static int metadata_from_nlattrs(struct sw_flow_match *match,  u64 *attrs,
 				 const struct nlattr **a, bool is_mask)
 {
+	if (*attrs & (1 << OVS_KEY_ATTR_DP_HASH)) {
+		u32 hash_val = nla_get_u32(a[OVS_KEY_ATTR_DP_HASH]);
+
+		SW_FLOW_KEY_PUT(match, ovs_flow_hash, hash_val, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_DP_HASH);
+	}
+
+	if (*attrs & (1 << OVS_KEY_ATTR_RECIRC_ID)) {
+		u32 recirc_id = nla_get_u32(a[OVS_KEY_ATTR_RECIRC_ID]);
+
+		SW_FLOW_KEY_PUT(match, recirc_id, recirc_id, is_mask);
+		*attrs &= ~(1 << OVS_KEY_ATTR_RECIRC_ID);
+	}
+
 	if (*attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
 		SW_FLOW_KEY_PUT(match, phy.priority,
 			  nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
@@ -836,7 +852,7 @@ int ovs_nla_get_match(struct sw_flow_match *match,
 
 /**
  * ovs_nla_get_flow_metadata - parses Netlink attributes into a flow key.
- * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
+ * @key: Receives extracted in_port, priority, tun_key and skb_mark.
  * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
  * sequence.
  *
@@ -846,32 +862,24 @@ int ovs_nla_get_match(struct sw_flow_match *match,
  * extracted from the packet itself.
  */
 
-int ovs_nla_get_flow_metadata(struct sw_flow *flow,
-			      const struct nlattr *attr)
+int ovs_nla_get_flow_metadata(const struct nlattr *attr,
+			      struct sw_flow_key *key)
 {
-	struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
 	const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
+	struct sw_flow_match match;
 	u64 attrs = 0;
 	int err;
-	struct sw_flow_match match;
-
-	flow->key.phy.in_port = DP_MAX_PORTS;
-	flow->key.phy.priority = 0;
-	flow->key.phy.skb_mark = 0;
-	memset(tun_key, 0, sizeof(flow->key.tun_key));
 
 	err = parse_flow_nlattrs(attr, a, &attrs);
 	if (err)
 		return -EINVAL;
 
 	memset(&match, 0, sizeof(match));
-	match.key = &flow->key;
+	match.key = key;
 
-	err = metadata_from_nlattrs(&match, &attrs, a, false);
-	if (err)
-		return err;
+	key->phy.in_port = DP_MAX_PORTS;
 
-	return 0;
+	return metadata_from_nlattrs(&match, &attrs, a, false);
 }
 
 int ovs_nla_put_flow(const struct sw_flow_key *swkey,
@@ -881,6 +889,12 @@ int ovs_nla_put_flow(const struct sw_flow_key *swkey,
 	struct nlattr *nla, *encap;
 	bool is_mask = (swkey != output);
 
+	if (nla_put_u32(skb, OVS_KEY_ATTR_RECIRC_ID, output->recirc_id))
+		goto nla_put_failure;
+
+	if (nla_put_u32(skb, OVS_KEY_ATTR_DP_HASH, output->ovs_flow_hash))
+		goto nla_put_failure;
+
 	if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
 		goto nla_put_failure;
 
@@ -1409,11 +1423,13 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
 		/* Expected argument lengths, (u32)-1 for variable length. */
 		static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
 			[OVS_ACTION_ATTR_OUTPUT] = sizeof(u32),
+			[OVS_ACTION_ATTR_RECIRC] = sizeof(u32),
 			[OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
 			[OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan),
 			[OVS_ACTION_ATTR_POP_VLAN] = 0,
 			[OVS_ACTION_ATTR_SET] = (u32)-1,
-			[OVS_ACTION_ATTR_SAMPLE] = (u32)-1
+			[OVS_ACTION_ATTR_SAMPLE] = (u32)-1,
+			[OVS_ACTION_ATTR_HASH] = sizeof(struct ovs_action_hash)
 		};
 		const struct ovs_action_push_vlan *vlan;
 		int type = nla_type(a);
@@ -1440,6 +1456,18 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
 				return -EINVAL;
 			break;
 
+		case OVS_ACTION_ATTR_HASH: {
+			const struct ovs_action_hash *act_hash = nla_data(a);
+
+			switch (act_hash->hash_alg) {
+			case OVS_HASH_ALG_L4:
+				break;
+			default:
+				return  -EINVAL;
+			}
+
+			break;
+		}
 
 		case OVS_ACTION_ATTR_POP_VLAN:
 			break;
@@ -1452,6 +1480,9 @@ int ovs_nla_copy_actions(const struct nlattr *attr,
 				return -EINVAL;
 			break;
 
+		case OVS_ACTION_ATTR_RECIRC:
+			break;
+
 		case OVS_ACTION_ATTR_SET:
 			err = validate_set(a, key, sfa, &skip_copy);
 			if (err)
diff --git a/net/openvswitch/flow_netlink.h b/net/openvswitch/flow_netlink.h
index 440151045d39..206e45add888 100644
--- a/net/openvswitch/flow_netlink.h
+++ b/net/openvswitch/flow_netlink.h
@@ -42,8 +42,8 @@ void ovs_match_init(struct sw_flow_match *match,
 
 int ovs_nla_put_flow(const struct sw_flow_key *,
 		     const struct sw_flow_key *, struct sk_buff *);
-int ovs_nla_get_flow_metadata(struct sw_flow *flow,
-			      const struct nlattr *attr);
+int ovs_nla_get_flow_metadata(const struct nlattr *, struct sw_flow_key *);
+
 int ovs_nla_get_match(struct sw_flow_match *match,
 		      const struct nlattr *,
 		      const struct nlattr *);
diff --git a/net/openvswitch/vport-gre.c b/net/openvswitch/vport-gre.c
index f49148a07da2..309cca6e816f 100644
--- a/net/openvswitch/vport-gre.c
+++ b/net/openvswitch/vport-gre.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2013 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -63,7 +63,7 @@ static __be16 filter_tnl_flags(__be16 flags)
 static struct sk_buff *__build_header(struct sk_buff *skb,
 				      int tunnel_hlen)
 {
-	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
+	const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->egress_tun_key;
 	struct tnl_ptk_info tpi;
 
 	skb = gre_handle_offloads(skb, !!(tun_key->tun_flags & TUNNEL_CSUM));
@@ -129,6 +129,7 @@ static int gre_err(struct sk_buff *skb, u32 info,
 static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
 {
 	struct net *net = ovs_dp_get_net(vport->dp);
+	struct ovs_key_ipv4_tunnel *tun_key;
 	struct flowi4 fl;
 	struct rtable *rt;
 	int min_headroom;
@@ -136,16 +137,17 @@ static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
 	__be16 df;
 	int err;
 
-	if (unlikely(!OVS_CB(skb)->tun_key)) {
+	if (unlikely(!OVS_CB(skb)->egress_tun_key)) {
 		err = -EINVAL;
 		goto error;
 	}
 
+	tun_key = OVS_CB(skb)->egress_tun_key;
 	/* Route lookup */
 	memset(&fl, 0, sizeof(fl));
-	fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
-	fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
-	fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
+	fl.daddr = tun_key->ipv4_dst;
+	fl.saddr = tun_key->ipv4_src;
+	fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
 	fl.flowi4_mark = skb->mark;
 	fl.flowi4_proto = IPPROTO_GRE;
 
@@ -153,7 +155,7 @@ static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
 	if (IS_ERR(rt))
 		return PTR_ERR(rt);
 
-	tunnel_hlen = ip_gre_calc_hlen(OVS_CB(skb)->tun_key->tun_flags);
+	tunnel_hlen = ip_gre_calc_hlen(tun_key->tun_flags);
 
 	min_headroom = LL_RESERVED_SPACE(rt->dst.dev) + rt->dst.header_len
 			+ tunnel_hlen + sizeof(struct iphdr)
@@ -185,15 +187,14 @@ static int gre_tnl_send(struct vport *vport, struct sk_buff *skb)
 		goto err_free_rt;
 	}
 
-	df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
+	df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
 		htons(IP_DF) : 0;
 
 	skb->ignore_df = 1;
 
 	return iptunnel_xmit(skb->sk, rt, skb, fl.saddr,
-			     OVS_CB(skb)->tun_key->ipv4_dst, IPPROTO_GRE,
-			     OVS_CB(skb)->tun_key->ipv4_tos,
-			     OVS_CB(skb)->tun_key->ipv4_ttl, df, false);
+			     tun_key->ipv4_dst, IPPROTO_GRE,
+			     tun_key->ipv4_tos, tun_key->ipv4_ttl, df, false);
 err_free_rt:
 	ip_rt_put(rt);
 error:
diff --git a/net/openvswitch/vport-vxlan.c b/net/openvswitch/vport-vxlan.c
index d8b7e247bebf..f19539bb8adc 100644
--- a/net/openvswitch/vport-vxlan.c
+++ b/net/openvswitch/vport-vxlan.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2013 Nicira, Inc.
+ * Copyright (c) 2014 Nicira, Inc.
  * Copyright (c) 2013 Cisco Systems, Inc.
  *
  * This program is free software; you can redistribute it and/or
@@ -140,22 +140,24 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
 	struct net *net = ovs_dp_get_net(vport->dp);
 	struct vxlan_port *vxlan_port = vxlan_vport(vport);
 	__be16 dst_port = inet_sk(vxlan_port->vs->sock->sk)->inet_sport;
+	struct ovs_key_ipv4_tunnel *tun_key;
 	struct rtable *rt;
 	struct flowi4 fl;
 	__be16 src_port;
 	__be16 df;
 	int err;
 
-	if (unlikely(!OVS_CB(skb)->tun_key)) {
+	if (unlikely(!OVS_CB(skb)->egress_tun_key)) {
 		err = -EINVAL;
 		goto error;
 	}
 
+	tun_key = OVS_CB(skb)->egress_tun_key;
 	/* Route lookup */
 	memset(&fl, 0, sizeof(fl));
-	fl.daddr = OVS_CB(skb)->tun_key->ipv4_dst;
-	fl.saddr = OVS_CB(skb)->tun_key->ipv4_src;
-	fl.flowi4_tos = RT_TOS(OVS_CB(skb)->tun_key->ipv4_tos);
+	fl.daddr = tun_key->ipv4_dst;
+	fl.saddr = tun_key->ipv4_src;
+	fl.flowi4_tos = RT_TOS(tun_key->ipv4_tos);
 	fl.flowi4_mark = skb->mark;
 	fl.flowi4_proto = IPPROTO_UDP;
 
@@ -165,7 +167,7 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
 		goto error;
 	}
 
-	df = OVS_CB(skb)->tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
+	df = tun_key->tun_flags & TUNNEL_DONT_FRAGMENT ?
 		htons(IP_DF) : 0;
 
 	skb->ignore_df = 1;
@@ -173,11 +175,10 @@ static int vxlan_tnl_send(struct vport *vport, struct sk_buff *skb)
 	src_port = udp_flow_src_port(net, skb, 0, 0, true);
 
 	err = vxlan_xmit_skb(vxlan_port->vs, rt, skb,
-			     fl.saddr, OVS_CB(skb)->tun_key->ipv4_dst,
-			     OVS_CB(skb)->tun_key->ipv4_tos,
-			     OVS_CB(skb)->tun_key->ipv4_ttl, df,
+			     fl.saddr, tun_key->ipv4_dst,
+			     tun_key->ipv4_tos, tun_key->ipv4_ttl, df,
 			     src_port, dst_port,
-			     htonl(be64_to_cpu(OVS_CB(skb)->tun_key->tun_id) << 8),
+			     htonl(be64_to_cpu(tun_key->tun_id) << 8),
 			     false);
 	if (err < 0)
 		ip_rt_put(rt);
diff --git a/net/openvswitch/vport.c b/net/openvswitch/vport.c
index 6d8f2ec481d9..5df8377fcfb1 100644
--- a/net/openvswitch/vport.c
+++ b/net/openvswitch/vport.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2012 Nicira, Inc.
+ * Copyright (c) 2007-2014 Nicira, Inc.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -148,8 +148,6 @@ struct vport *ovs_vport_alloc(int priv_size, const struct vport_ops *ops,
 		return ERR_PTR(-ENOMEM);
 	}
 
-	spin_lock_init(&vport->stats_lock);
-
 	return vport;
 }
 
@@ -268,14 +266,10 @@ void ovs_vport_get_stats(struct vport *vport, struct ovs_vport_stats *stats)
 	 * netdev-stats can be directly read over netlink-ioctl.
 	 */
 
-	spin_lock_bh(&vport->stats_lock);
-
-	stats->rx_errors	= vport->err_stats.rx_errors;
-	stats->tx_errors	= vport->err_stats.tx_errors;
-	stats->tx_dropped	= vport->err_stats.tx_dropped;
-	stats->rx_dropped	= vport->err_stats.rx_dropped;
-
-	spin_unlock_bh(&vport->stats_lock);
+	stats->rx_errors  = atomic_long_read(&vport->err_stats.rx_errors);
+	stats->tx_errors  = atomic_long_read(&vport->err_stats.tx_errors);
+	stats->tx_dropped = atomic_long_read(&vport->err_stats.tx_dropped);
+	stats->rx_dropped = atomic_long_read(&vport->err_stats.rx_dropped);
 
 	for_each_possible_cpu(i) {
 		const struct pcpu_sw_netstats *percpu_stats;
@@ -441,6 +435,8 @@ void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
 		       struct ovs_key_ipv4_tunnel *tun_key)
 {
 	struct pcpu_sw_netstats *stats;
+	struct sw_flow_key key;
+	int error;
 
 	stats = this_cpu_ptr(vport->percpu_stats);
 	u64_stats_update_begin(&stats->syncp);
@@ -448,8 +444,15 @@ void ovs_vport_receive(struct vport *vport, struct sk_buff *skb,
 	stats->rx_bytes += skb->len;
 	u64_stats_update_end(&stats->syncp);
 
-	OVS_CB(skb)->tun_key = tun_key;
-	ovs_dp_process_received_packet(vport, skb);
+	OVS_CB(skb)->input_vport = vport;
+	OVS_CB(skb)->egress_tun_key = NULL;
+	/* Extract flow from 'skb' into 'key'. */
+	error = ovs_flow_key_extract(tun_key, skb, &key);
+	if (unlikely(error)) {
+		kfree_skb(skb);
+		return;
+	}
+	ovs_dp_process_packet(skb, &key);
 }
 
 /**
@@ -495,27 +498,24 @@ int ovs_vport_send(struct vport *vport, struct sk_buff *skb)
 static void ovs_vport_record_error(struct vport *vport,
 				   enum vport_err_type err_type)
 {
-	spin_lock(&vport->stats_lock);
-
 	switch (err_type) {
 	case VPORT_E_RX_DROPPED:
-		vport->err_stats.rx_dropped++;
+		atomic_long_inc(&vport->err_stats.rx_dropped);
 		break;
 
 	case VPORT_E_RX_ERROR:
-		vport->err_stats.rx_errors++;
+		atomic_long_inc(&vport->err_stats.rx_errors);
 		break;
 
 	case VPORT_E_TX_DROPPED:
-		vport->err_stats.tx_dropped++;
+		atomic_long_inc(&vport->err_stats.tx_dropped);
 		break;
 
 	case VPORT_E_TX_ERROR:
-		vport->err_stats.tx_errors++;
+		atomic_long_inc(&vport->err_stats.tx_errors);
 		break;
 	}
 
-	spin_unlock(&vport->stats_lock);
 }
 
 static void free_vport_rcu(struct rcu_head *rcu)
diff --git a/net/openvswitch/vport.h b/net/openvswitch/vport.h
index 35f89d84b45e..0d95b9f5f9c4 100644
--- a/net/openvswitch/vport.h
+++ b/net/openvswitch/vport.h
@@ -62,10 +62,10 @@ int ovs_vport_send(struct vport *, struct sk_buff *);
 /* The following definitions are for implementers of vport devices: */
 
 struct vport_err_stats {
-	u64 rx_dropped;
-	u64 rx_errors;
-	u64 tx_dropped;
-	u64 tx_errors;
+	atomic_long_t rx_dropped;
+	atomic_long_t rx_errors;
+	atomic_long_t tx_dropped;
+	atomic_long_t tx_errors;
 };
 /**
  * struct vport_portids - array of netlink portids of a vport.
@@ -93,7 +93,6 @@ struct vport_portids {
  * @dp_hash_node: Element in @datapath->ports hash table in datapath.c.
  * @ops: Class structure.
  * @percpu_stats: Points to per-CPU statistics used and maintained by vport
- * @stats_lock: Protects @err_stats;
  * @err_stats: Points to error statistics used and maintained by vport
  */
 struct vport {
@@ -108,7 +107,6 @@ struct vport {
 
 	struct pcpu_sw_netstats __percpu *percpu_stats;
 
-	spinlock_t stats_lock;
 	struct vport_err_stats err_stats;
 };