openvswitch: Add support for network namespaces.

Following patch adds support for network namespace to openvswitch.
Since it must release devices when namespaces are destroyed, a
side effect of this patch is that the module no longer keeps a
refcount but instead cleans up any state when it is unloaded.

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>

1 files changed, 162 insertions, 107 deletions

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index d8277d29e710..cad39fca75a9 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -49,12 +49,29 @@
 #include <linux/dmi.h>
 #include <linux/workqueue.h>
 #include <net/genetlink.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
 
 #include "datapath.h"
 #include "flow.h"
 #include "vport-internal_dev.h"
 
 /**
+ * struct ovs_net - Per net-namespace data for ovs.
+ * @dps: List of datapaths to enable dumping them all out.
+ * Protected by genl_mutex.
+ */
+struct ovs_net {
+        struct list_head dps;
+};
+
+static int ovs_net_id __read_mostly;
+
+#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);
+
+/**
  * DOC: Locking:
  *
  * Writes to device state (add/remove datapath, port, set operations on vports,
@@ -71,29 +88,21 @@
  * each other.
  */
 
-/* Global list of datapaths to enable dumping them all out.
- * Protected by genl_mutex.
- */
-static LIST_HEAD(dps);
-
-#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);
-
 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)
@@ -135,6 +144,7 @@ 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));
         kfree(dp);
 }
 
@@ -220,11 +230,12 @@ 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,
+        .netnsok = true
 };
 
 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
-              const struct dp_upcall_info *upcall_info)
+                  const struct dp_upcall_info *upcall_info)
 {
         struct dp_stats_percpu *stats;
         int dp_ifindex;
@@ -242,9 +253,9 @@ int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
         }
 
         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;
 
@@ -260,7 +271,8 @@ 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)
 {
         unsigned short gso_type = skb_shinfo(skb)->gso_type;
@@ -276,7 +288,7 @@ 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;
 
@@ -306,7 +318,8 @@ 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;
@@ -362,7 +375,7 @@ 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);
@@ -370,15 +383,10 @@ 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);
@@ -668,7 +676,7 @@ 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;
@@ -742,7 +750,8 @@ 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,
+        .netnsok = true
 };
 
 static struct genl_multicast_group ovs_dp_flow_multicast_group = {
@@ -894,7 +903,7 @@ 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;
@@ -995,7 +1004,7 @@ 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,
+                netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
                                 ovs_dp_flow_multicast_group.id, PTR_ERR(reply));
         return 0;
 
@@ -1023,7 +1032,7 @@ 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;
 
@@ -1052,16 +1061,17 @@ 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)
@@ -1090,7 +1100,7 @@ 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;
 
@@ -1152,7 +1162,8 @@ 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,
+        .netnsok = true
 };
 
 static struct genl_multicast_group ovs_dp_datapath_multicast_group = {
@@ -1210,18 +1221,19 @@ static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
 }
 
 /* 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();
         }
@@ -1235,6 +1247,7 @@ 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;
@@ -1242,15 +1255,14 @@ 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);
+        ovs_dp_set_net(dp, hold_net(sock_net(skb->sk)));
 
         /* Allocate table. */
         err = -ENOMEM;
@@ -1287,7 +1299,8 @@ 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);
         rtnl_unlock();
 
         genl_notify(reply, genl_info_net(info), info->snd_pid,
@@ -1302,34 +1315,20 @@ err_destroy_percpu:
 err_destroy_table:
         ovs_flow_tbl_destroy(genl_dereference(dp->table));
 err_free_dp:
+        release_net(ovs_dp_get_net(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;
 
         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);
@@ -1345,17 +1344,32 @@ 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;
+
+        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();
-        return err;
 }
 
 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
@@ -1364,7 +1378,7 @@ static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
         struct datapath *dp;
         int 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);
 
@@ -1372,7 +1386,7 @@ 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(sock_net(skb->sk)->genl_sock, 0,
                                 ovs_dp_datapath_multicast_group.id, err);
                 return 0;
         }
@@ -1389,7 +1403,7 @@ static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
         struct sk_buff *reply;
         struct datapath *dp;
 
-        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);
 
@@ -1403,11 +1417,12 @@ 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) {
+        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,
@@ -1459,7 +1474,8 @@ 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,
+        .netnsok = true
 };
 
 struct genl_multicast_group ovs_dp_vport_multicast_group = {
@@ -1525,14 +1541,15 @@ struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
 }
 
 /* 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);
                 if (ovs_header->dp_ifindex &&
@@ -1545,7 +1562,7 @@ 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);
 
@@ -1574,7 +1591,7 @@ 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;
@@ -1638,7 +1655,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
         int err;
 
         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;
@@ -1658,7 +1675,7 @@ static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
         reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
                                          OVS_VPORT_CMD_NEW);
         if (IS_ERR(reply)) {
-                netlink_set_err(init_net.genl_sock, 0,
+                netlink_set_err(sock_net(skb->sk)->genl_sock, 0,
                                 ovs_dp_vport_multicast_group.id, PTR_ERR(reply));
                 goto exit_unlock;
         }
@@ -1679,7 +1696,7 @@ static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
         int err;
 
         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;
@@ -1714,7 +1731,7 @@ static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
         int err;
 
         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;
@@ -1741,7 +1758,7 @@ 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;
 
@@ -1766,28 +1783,6 @@ static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
         return retval;
 }
 
-static void rehash_flow_table(struct work_struct *work)
-{
-        struct datapath *dp;
-
-        genl_lock();
-
-        list_for_each_entry(dp, &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);
-                }
-        }
-
-        genl_unlock();
-
-        schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
-}
-
 static struct genl_ops dp_vport_genl_ops[] = {
         { .cmd = OVS_VPORT_CMD_NEW,
           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
@@ -1872,6 +1867,59 @@ error:
         return err;
 }
 
+static void rehash_flow_table(struct work_struct *work)
+{
+        struct datapath *dp;
+        struct net *net;
+
+        genl_lock();
+        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();
+        genl_unlock();
+
+        schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL);
+}
+
+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);
+        struct datapath *dp, *dp_next;
+
+        genl_lock();
+        list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
+                __dp_destroy(dp);
+        genl_unlock();
+}
+
+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;
@@ -1889,10 +1937,14 @@ 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;
@@ -1903,6 +1955,8 @@ static int __init dp_init(void)
 
 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:
@@ -1914,9 +1968,10 @@ error:
 static void dp_cleanup(void)
 {
         cancel_delayed_work_sync(&rehash_flow_wq);
-        rcu_barrier();
         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();
 }