X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=datapath%2Fdatapath.c;h=220c7dd42921006a151e1bc1b215859274a58af1;hb=ef0ce8aeeeb95d2d64a8a22bd5839d7f684a31f5;hp=c86c20bc77082939ec93eebe716e32e781536ba8;hpb=e1cf87ff60e7f61fe3b7137463f7c42439f88323;p=openvswitch

diff --git a/datapath/datapath.c b/datapath/datapath.c
index c86c20bc..220c7dd4 100644
--- a/datapath/datapath.c
+++ b/datapath/datapath.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007-2011 Nicira Networks.
+ * Copyright (c) 2007-2012 Nicira Networks.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of version 2 of the GNU General Public
@@ -50,19 +50,28 @@
 #include <linux/rculist.h>
 #include <linux/dmi.h>
 #include <net/genetlink.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
 
 #include "checksum.h"
 #include "datapath.h"
 #include "flow.h"
+#include "genl_exec.h"
 #include "vlan.h"
 #include "tunnel.h"
 #include "vport-internal_dev.h"
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
-    LINUX_VERSION_CODE > KERNEL_VERSION(3,2,0)
+    LINUX_VERSION_CODE >= KERNEL_VERSION(3,3,0)
 #error Kernels before 2.6.18 or after 3.2 are not supported by this version of Open vSwitch.
 #endif
 
+#define REHASH_FLOW_INTERVAL (10 * 60 * HZ)
+static void rehash_flow_table(struct work_struct *work);
+static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table);
+
+int ovs_net_id __read_mostly;
+
 int (*ovs_dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
 EXPORT_SYMBOL(ovs_dp_ioctl_hook);
 
@@ -83,25 +92,21 @@ EXPORT_SYMBOL(ovs_dp_ioctl_hook);
  * each other.
  */
 
-/* Global list of datapaths to enable dumping them all out.
- * Protected by genl_mutex.
- */
-static LIST_HEAD(dps);
-
 static struct vport *new_vport(const struct vport_parms *);
-static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
+static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *,
 			     const struct dp_upcall_info *);
-static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
+static int queue_userspace_packet(struct net *, int dp_ifindex,
+				  struct sk_buff *,
 				  const struct dp_upcall_info *);
 
 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
-static struct datapath *get_dp(int dp_ifindex)
+static struct datapath *get_dp(struct net *net, int dp_ifindex)
 {
 	struct datapath *dp = NULL;
 	struct net_device *dev;
 
 	rcu_read_lock();
-	dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
+	dev = dev_get_by_index_rcu(net, dp_ifindex);
 	if (dev) {
 		struct vport *vport = ovs_internal_dev_get_vport(dev);
 		if (vport)
@@ -213,11 +218,11 @@ static void dp_ifinfo_notify(int event, struct vport *port)
 		}
 	}
 
-	rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
+	rtnl_notify(skb, ovs_dp_get_net(port->dp), 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
 
 	return;
 err:
-	rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
+	rtnl_set_sk_err(ovs_dp_get_net(port->dp), RTNLGRP_LINK, err);
 out:
 	kfree_skb(skb);
 }
@@ -238,6 +243,7 @@ static void destroy_dp_rcu(struct rcu_head *rcu)
 
 	ovs_flow_tbl_destroy((__force struct flow_table *)dp->table);
 	free_percpu(dp->stats_percpu);
+	release_net(ovs_dp_get_net(dp));
 	kobject_put(&dp->ifobj);
 }
 
@@ -333,7 +339,8 @@ static struct genl_family dp_packet_genl_family = {
 	.hdrsize = sizeof(struct ovs_header),
 	.name = OVS_PACKET_FAMILY,
 	.version = OVS_PACKET_VERSION,
-	.maxattr = OVS_PACKET_ATTR_MAX
+	.maxattr = OVS_PACKET_ATTR_MAX,
+	 SET_NETNSOK
 };
 
 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
@@ -357,9 +364,9 @@ int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
 	forward_ip_summed(skb, true);
 
 	if (!skb_is_gso(skb))
-		err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
+		err = queue_userspace_packet(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 	else
-		err = queue_gso_packets(dp_ifindex, skb, upcall_info);
+		err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info);
 	if (err)
 		goto err;
 
@@ -375,7 +382,8 @@ err:
 	return err;
 }
 
-static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
+static int queue_gso_packets(struct net *net, int dp_ifindex,
+			     struct sk_buff *skb,
 			     const struct dp_upcall_info *upcall_info)
 {
 	struct dp_upcall_info later_info;
@@ -390,7 +398,7 @@ static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
 	/* Queue all of the segments. */
 	skb = segs;
 	do {
-		err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
+		err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info);
 		if (err)
 			break;
 
@@ -420,7 +428,8 @@ static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
 	return err;
 }
 
-static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
+static int queue_userspace_packet(struct net *net, int dp_ifindex,
+				  struct sk_buff *skb,
 				  const struct dp_upcall_info *upcall_info)
 {
 	struct ovs_header *upcall;
@@ -475,7 +484,7 @@ static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
 
 	skb_copy_and_csum_dev(skb, nla_data(nla));
 
-	err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
+	err = genlmsg_unicast(net, user_skb, upcall_info->pid);
 
 out:
 	kfree_skb(nskb);
@@ -483,15 +492,10 @@ out:
 }
 
 /* Called with genl_mutex. */
-static int flush_flows(int dp_ifindex)
+static int flush_flows(struct datapath *dp)
 {
 	struct flow_table *old_table;
 	struct flow_table *new_table;
-	struct datapath *dp;
-
-	dp = get_dp(dp_ifindex);
-	if (!dp)
-		return -ENODEV;
 
 	old_table = genl_dereference(dp->table);
 	new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS);
@@ -775,7 +779,7 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
 	packet->priority = flow->key.phy.priority;
 
 	rcu_read_lock();
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	err = -ENODEV;
 	if (!dp)
 		goto err_unlock;
@@ -849,7 +853,8 @@ static struct genl_family dp_flow_genl_family = {
 	.hdrsize = sizeof(struct ovs_header),
 	.name = OVS_FLOW_FAMILY,
 	.version = OVS_FLOW_VERSION,
-	.maxattr = OVS_FLOW_ATTR_MAX
+	.maxattr = OVS_FLOW_ATTR_MAX,
+	 SET_NETNSOK
 };
 
 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
@@ -998,7 +1003,7 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 		goto error;
 	}
 
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	error = -ENODEV;
 	if (!dp)
 		goto error;
@@ -1099,9 +1104,8 @@ static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
 			   ovs_dp_flow_multicast_group.id, info->nlhdr,
 			   GFP_KERNEL);
 	else
-		netlink_set_err(INIT_NET_GENL_SOCK, 0,
-				ovs_dp_flow_multicast_group.id,
-				PTR_ERR(reply));
+		netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
+				ovs_dp_flow_multicast_group.id,	PTR_ERR(reply));
 	return 0;
 
 error_free_flow:
@@ -1128,7 +1132,7 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		return err;
 
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	if (!dp)
 		return -ENODEV;
 
@@ -1157,16 +1161,17 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
 	int err;
 	int key_len;
 
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+	if (!dp)
+		return -ENODEV;
+
 	if (!a[OVS_FLOW_ATTR_KEY])
-		return flush_flows(ovs_header->dp_ifindex);
+		return flush_flows(dp);
+
 	err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
 	if (err)
 		return err;
 
-	dp = get_dp(ovs_header->dp_ifindex);
-	if (!dp)
-		return -ENODEV;
-
 	table = genl_dereference(dp->table);
 	flow = ovs_flow_tbl_lookup(table, &key, key_len);
 	if (!flow)
@@ -1195,7 +1200,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	struct datapath *dp;
 	struct flow_table *table;
 
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	if (!dp)
 		return -ENODEV;
 
@@ -1259,7 +1264,8 @@ static struct genl_family dp_datapath_genl_family = {
 	.hdrsize = sizeof(struct ovs_header),
 	.name = OVS_DATAPATH_FAMILY,
 	.version = OVS_DATAPATH_VERSION,
-	.maxattr = OVS_DP_ATTR_MAX
+	.maxattr = OVS_DP_ATTR_MAX,
+	 SET_NETNSOK
 };
 
 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
@@ -1321,18 +1327,19 @@ static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
 }
 
 /* Called with genl_mutex and optionally with RTNL lock also. */
-static struct datapath *lookup_datapath(struct ovs_header *ovs_header,
+static struct datapath *lookup_datapath(struct net *net,
+					struct ovs_header *ovs_header,
 					struct nlattr *a[OVS_DP_ATTR_MAX + 1])
 {
 	struct datapath *dp;
 
 	if (!a[OVS_DP_ATTR_NAME])
-		dp = get_dp(ovs_header->dp_ifindex);
+		dp = get_dp(net, ovs_header->dp_ifindex);
 	else {
 		struct vport *vport;
 
 		rcu_read_lock();
-		vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
+		vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME]));
 		dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
 		rcu_read_unlock();
 	}
@@ -1346,6 +1353,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 	struct sk_buff *reply;
 	struct datapath *dp;
 	struct vport *vport;
+	struct ovs_net *ovs_net;
 	int err;
 
 	err = -EINVAL;
@@ -1357,14 +1365,12 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 		goto err;
 
 	rtnl_lock();
-	err = -ENODEV;
-	if (!try_module_get(THIS_MODULE))
-		goto err_unlock_rtnl;
 
 	err = -ENOMEM;
 	dp = kzalloc(sizeof(*dp), GFP_KERNEL);
 	if (dp == NULL)
-		goto err_put_module;
+		goto err_unlock_rtnl;
+
 	INIT_LIST_HEAD(&dp->port_list);
 
 	/* Initialize kobject for bridge.  This will be added as
@@ -1383,6 +1389,7 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 		err = -ENOMEM;
 		goto err_destroy_table;
 	}
+	ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
 
 	/* Set up our datapath device. */
 	parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
@@ -1407,7 +1414,8 @@ static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
 	if (IS_ERR(reply))
 		goto err_destroy_local_port;
 
-	list_add_tail(&dp->list_node, &dps);
+	ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id);
+	list_add_tail(&dp->list_node, &ovs_net->dps);
 	ovs_dp_sysfs_add_dp(dp);
 
 	rtnl_unlock();
@@ -1425,37 +1433,18 @@ err_destroy_table:
 	ovs_flow_tbl_destroy(genl_dereference(dp->table));
 err_free_dp:
 	kfree(dp);
-err_put_module:
-	module_put(THIS_MODULE);
 err_unlock_rtnl:
 	rtnl_unlock();
 err:
 	return err;
 }
 
-static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
+/* Called with genl_mutex. */
+static void __dp_destroy(struct datapath *dp)
 {
 	struct vport *vport, *next_vport;
-	struct sk_buff *reply;
-	struct datapath *dp;
-	int err;
-
-	err = ovs_dp_cmd_validate(info->attrs);
-	if (err)
-		goto exit;
 
 	rtnl_lock();
-	dp = lookup_datapath(info->userhdr, info->attrs);
-	err = PTR_ERR(dp);
-	if (IS_ERR(dp))
-		goto exit_unlock;
-
-	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
-				      info->snd_seq, OVS_DP_CMD_DEL);
-	err = PTR_ERR(reply);
-	if (IS_ERR(reply))
-		goto exit_unlock;
-
 	list_for_each_entry_safe(vport, next_vport, &dp->port_list, node)
 		if (vport->port_no != OVSP_LOCAL)
 			ovs_dp_detach_port(vport);
@@ -1472,18 +1461,36 @@ static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
 	rtnl_unlock();
 
 	call_rcu(&dp->rcu, destroy_dp_rcu);
-	module_put(THIS_MODULE);
+}
+
+static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
+{
+	struct sk_buff *reply;
+	struct datapath *dp;
+	int err;
+
+	err = ovs_dp_cmd_validate(info->attrs);
+	if (err)
+		return err;
+
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
+	err = PTR_ERR(dp);
+	if (IS_ERR(dp))
+		return err;
+
+	reply = ovs_dp_cmd_build_info(dp, info->snd_pid,
+				      info->snd_seq, OVS_DP_CMD_DEL);
+	err = PTR_ERR(reply);
+	if (IS_ERR(reply))
+		return err;
+
+	__dp_destroy(dp);
 
 	genl_notify(reply, genl_info_net(info), info->snd_pid,
 		    ovs_dp_datapath_multicast_group.id, info->nlhdr,
 		    GFP_KERNEL);
 
 	return 0;
-
-exit_unlock:
-	rtnl_unlock();
-exit:
-	return err;
 }
 
 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
@@ -1496,7 +1503,7 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		return err;
 
-	dp = lookup_datapath(info->userhdr, info->attrs);
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
 	if (IS_ERR(dp))
 		return PTR_ERR(dp);
 
@@ -1504,7 +1511,7 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
 				      info->snd_seq, OVS_DP_CMD_NEW);
 	if (IS_ERR(reply)) {
 		err = PTR_ERR(reply);
-		netlink_set_err(INIT_NET_GENL_SOCK, 0,
+		netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
 				ovs_dp_datapath_multicast_group.id, err);
 		return 0;
 	}
@@ -1526,7 +1533,7 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
 	if (err)
 		return err;
 
-	dp = lookup_datapath(info->userhdr, info->attrs);
+	dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs);
 	if (IS_ERR(dp))
 		return PTR_ERR(dp);
 
@@ -1540,14 +1547,14 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
 
 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 {
+	struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
 	struct datapath *dp;
 	int skip = cb->args[0];
 	int i = 0;
 
-	list_for_each_entry(dp, &dps, list_node) {
-		if (i < skip)
-			continue;
-		if (ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
+	list_for_each_entry(dp, &ovs_net->dps, list_node) {
+		if (i >= skip &&
+		    ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
 					 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 					 OVS_DP_CMD_NEW) < 0)
 			break;
@@ -1603,7 +1610,8 @@ static struct genl_family dp_vport_genl_family = {
 	.hdrsize = sizeof(struct ovs_header),
 	.name = OVS_VPORT_FAMILY,
 	.version = OVS_VPORT_VERSION,
-	.maxattr = OVS_VPORT_ATTR_MAX
+	.maxattr = OVS_VPORT_ATTR_MAX,
+	 SET_NETNSOK
 };
 
 struct genl_multicast_group ovs_dp_vport_multicast_group = {
@@ -1675,14 +1683,15 @@ static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
 }
 
 /* Called with RTNL lock or RCU read lock. */
-static struct vport *lookup_vport(struct ovs_header *ovs_header,
+static struct vport *lookup_vport(struct net *net,
+				  struct ovs_header *ovs_header,
 				  struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
 {
 	struct datapath *dp;
 	struct vport *vport;
 
 	if (a[OVS_VPORT_ATTR_NAME]) {
-		vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
+		vport = ovs_vport_locate(net, nla_data(a[OVS_VPORT_ATTR_NAME]));
 		if (!vport)
 			return ERR_PTR(-ENODEV);
 		return vport;
@@ -1692,7 +1701,7 @@ static struct vport *lookup_vport(struct ovs_header *ovs_header,
 		if (port_no >= DP_MAX_PORTS)
 			return ERR_PTR(-EFBIG);
 
-		dp = get_dp(ovs_header->dp_ifindex);
+		dp = get_dp(net, ovs_header->dp_ifindex);
 		if (!dp)
 			return ERR_PTR(-ENODEV);
 
@@ -1740,7 +1749,7 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
 		goto exit;
 
 	rtnl_lock();
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	err = -ENODEV;
 	if (!dp)
 		goto exit_unlock;
@@ -1815,7 +1824,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
 		goto exit;
 
 	rtnl_lock();
-	vport = lookup_vport(info->userhdr, a);
+	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
 	err = PTR_ERR(vport);
 	if (IS_ERR(vport))
 		goto exit_unlock;
@@ -1836,7 +1845,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
 					 OVS_VPORT_CMD_NEW);
 	if (IS_ERR(reply)) {
 		err = PTR_ERR(reply);
-		netlink_set_err(INIT_NET_GENL_SOCK, 0,
+		netlink_set_err(GENL_SOCK(sock_net(skb->sk)), 0,
 				ovs_dp_vport_multicast_group.id, err);
 		return 0;
 	}
@@ -1862,7 +1871,7 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
 		goto exit;
 
 	rtnl_lock();
-	vport = lookup_vport(info->userhdr, a);
+	vport = lookup_vport(sock_net(skb->sk), info->userhdr, a);
 	err = PTR_ERR(vport);
 	if (IS_ERR(vport))
 		goto exit_unlock;
@@ -1902,7 +1911,7 @@ static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
 		goto exit;
 
 	rcu_read_lock();
-	vport = lookup_vport(ovs_header, a);
+	vport = lookup_vport(sock_net(skb->sk), ovs_header, a);
 	err = PTR_ERR(vport);
 	if (IS_ERR(vport))
 		goto exit_unlock;
@@ -1930,7 +1939,7 @@ static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 	u32 port_no;
 	int retval;
 
-	dp = get_dp(ovs_header->dp_ifindex);
+	dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
 	if (!dp)
 		return -ENODEV;
 
@@ -2039,6 +2048,69 @@ error:
 	return err;
 }
 
+static int __rehash_flow_table(void *dummy)
+{
+	struct datapath *dp;
+	struct net *net;
+
+	rtnl_lock();
+	for_each_net(net) {
+		struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+		list_for_each_entry(dp, &ovs_net->dps, list_node) {
+			struct flow_table *old_table = genl_dereference(dp->table);
+			struct flow_table *new_table;
+
+			new_table = ovs_flow_tbl_rehash(old_table);
+			if (!IS_ERR(new_table)) {
+				rcu_assign_pointer(dp->table, new_table);
+				ovs_flow_tbl_deferred_destroy(old_table);
+			}
+		}
+	}
+	rtnl_unlock();
+	return 0;
+}
+
+static void rehash_flow_table(struct work_struct *work)
+{
+	genl_exec(__rehash_flow_table, NULL);
+	schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
+}
+
+static int dp_destroy_all(void *data)
+{
+	struct datapath *dp, *dp_next;
+	struct ovs_net *ovs_net = data;
+
+	list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
+		__dp_destroy(dp);
+
+	return 0;
+}
+
+static int __net_init ovs_init_net(struct net *net)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+	INIT_LIST_HEAD(&ovs_net->dps);
+	return 0;
+}
+
+static void __net_exit ovs_exit_net(struct net *net)
+{
+	struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
+
+	genl_exec(dp_destroy_all, ovs_net);
+}
+
+static struct pernet_operations ovs_net_ops = {
+	.init = ovs_init_net,
+	.exit = ovs_exit_net,
+	.id   = &ovs_net_id,
+	.size = sizeof(struct ovs_net),
+};
+
 static int __init dp_init(void)
 {
 	struct sk_buff *dummy_skb;
@@ -2049,10 +2121,18 @@ static int __init dp_init(void)
 	pr_info("Open vSwitch switching datapath %s, built "__DATE__" "__TIME__"\n",
 		VERSION BUILDNR);
 
-	err = ovs_tnl_init();
+	err = genl_exec_init();
 	if (err)
 		goto error;
 
+	err = ovs_workqueues_init();
+	if (err)
+		goto error_genl_exec;
+
+	err = ovs_tnl_init();
+	if (err)
+		goto error_wq;
+
 	err = ovs_flow_init();
 	if (err)
 		goto error_tnl_exit;
@@ -2061,36 +2141,52 @@ static int __init dp_init(void)
 	if (err)
 		goto error_flow_exit;
 
-	err = register_netdevice_notifier(&ovs_dp_device_notifier);
+	err = register_pernet_device(&ovs_net_ops);
 	if (err)
 		goto error_vport_exit;
 
+	err = register_netdevice_notifier(&ovs_dp_device_notifier);
+	if (err)
+		goto error_netns_exit;
+
 	err = dp_register_genl();
 	if (err < 0)
 		goto error_unreg_notifier;
 
+	schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
+
 	return 0;
 
 error_unreg_notifier:
 	unregister_netdevice_notifier(&ovs_dp_device_notifier);
+error_netns_exit:
+	unregister_pernet_device(&ovs_net_ops);
 error_vport_exit:
 	ovs_vport_exit();
 error_flow_exit:
 	ovs_flow_exit();
 error_tnl_exit:
 	ovs_tnl_exit();
+error_wq:
+	ovs_workqueues_exit();
+error_genl_exec:
+	genl_exec_exit();
 error:
 	return err;
 }
 
 static void dp_cleanup(void)
 {
-	rcu_barrier();
+	cancel_delayed_work_sync(&rehash_flow_wq);
 	dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
 	unregister_netdevice_notifier(&ovs_dp_device_notifier);
+	unregister_pernet_device(&ovs_net_ops);
+	rcu_barrier();
 	ovs_vport_exit();
 	ovs_flow_exit();
 	ovs_tnl_exit();
+	ovs_workqueues_exit();
+	genl_exec_exit();
 }
 
 module_init(dp_init);