1 files changed, 202 insertions, 141 deletions

diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c
index e6d7255183eb..ab141d49bb9d 100644
--- a/net/openvswitch/datapath.c
+++ b/net/openvswitch/datapath.c
@@ -59,6 +59,7 @@
 #include "vport-netdev.h"
 
 int ovs_net_id __read_mostly;
+EXPORT_SYMBOL_GPL(ovs_net_id);
 
 static struct genl_family dp_packet_genl_family;
 static struct genl_family dp_flow_genl_family;
@@ -130,27 +131,41 @@ int lockdep_ovsl_is_held(void)
         else
                 return 1;
 }
+EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held);
 #endif
 
 static struct vport *new_vport(const struct vport_parms *);
 static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
+                             const struct sw_flow_key *,
                              const struct dp_upcall_info *);
 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
+                                  const struct sw_flow_key *,
                                   const struct dp_upcall_info *);
 
-/* Must be called with rcu_read_lock or ovs_mutex. */
-static struct datapath *get_dp(struct net *net, int dp_ifindex)
+/* Must be called with rcu_read_lock. */
+static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex)
 {
-        struct datapath *dp = NULL;
-        struct net_device *dev;
+        struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex);
 
-        rcu_read_lock();
-        dev = dev_get_by_index_rcu(net, dp_ifindex);
         if (dev) {
                 struct vport *vport = ovs_internal_dev_get_vport(dev);
                 if (vport)
-                        dp = vport->dp;
+                        return vport->dp;
         }
+
+        return NULL;
+}
+
+/* The caller must hold either ovs_mutex or rcu_read_lock to keep the
+ * returned dp pointer valid.
+ */
+static inline struct datapath *get_dp(struct net *net, int dp_ifindex)
+{
+        struct datapath *dp;
+
+        WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held());
+        rcu_read_lock();
+        dp = get_dp_rcu(net, dp_ifindex);
         rcu_read_unlock();
 
         return dp;
@@ -163,7 +178,7 @@ const char *ovs_dp_name(const struct datapath *dp)
         return vport->ops->get_name(vport);
 }
 
-static int get_dpifindex(struct datapath *dp)
+static int get_dpifindex(const struct datapath *dp)
 {
         struct vport *local;
         int ifindex;
@@ -185,6 +200,7 @@ static void destroy_dp_rcu(struct rcu_head *rcu)
 {
         struct datapath *dp = container_of(rcu, struct datapath, rcu);
 
+        ovs_flow_tbl_destroy(&dp->table);
         free_percpu(dp->stats_percpu);
         release_net(ovs_dp_get_net(dp));
         kfree(dp->ports);
@@ -243,6 +259,7 @@ 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 sw_flow_actions *sf_acts;
         struct dp_stats_percpu *stats;
         u64 *stats_counter;
         u32 n_mask_hit;
@@ -256,10 +273,10 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
                 int error;
 
                 upcall.cmd = OVS_PACKET_CMD_MISS;
-                upcall.key = key;
                 upcall.userdata = NULL;
                 upcall.portid = ovs_vport_find_upcall_portid(p, skb);
-                error = ovs_dp_upcall(dp, skb, &upcall);
+                upcall.egress_tun_info = NULL;
+                error = ovs_dp_upcall(dp, skb, key, &upcall);
                 if (unlikely(error))
                         kfree_skb(skb);
                 else
@@ -268,10 +285,10 @@ void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
                 goto out;
         }
 
-        OVS_CB(skb)->flow = flow;
+        ovs_flow_stats_update(flow, key->tp.flags, skb);
+        sf_acts = rcu_dereference(flow->sf_acts);
+        ovs_execute_actions(dp, skb, sf_acts, key);
 
-        ovs_flow_stats_update(OVS_CB(skb)->flow, key->tp.flags, skb);
-        ovs_execute_actions(dp, skb, key);
         stats_counter = &stats->n_hit;
 
 out:
@@ -283,6 +300,7 @@ out:
 }
 
 int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
+                  const struct sw_flow_key *key,
                   const struct dp_upcall_info *upcall_info)
 {
         struct dp_stats_percpu *stats;
@@ -294,9 +312,9 @@ int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
         }
 
         if (!skb_is_gso(skb))
-                err = queue_userspace_packet(dp, skb, upcall_info);
+                err = queue_userspace_packet(dp, skb, key, upcall_info);
         else
-                err = queue_gso_packets(dp, skb, upcall_info);
+                err = queue_gso_packets(dp, skb, key, upcall_info);
         if (err)
                 goto err;
 
@@ -313,39 +331,43 @@ err:
 }
 
 static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
+                             const struct sw_flow_key *key,
                              const struct dp_upcall_info *upcall_info)
 {
         unsigned short gso_type = skb_shinfo(skb)->gso_type;
-        struct dp_upcall_info later_info;
         struct sw_flow_key later_key;
         struct sk_buff *segs, *nskb;
+        struct ovs_skb_cb ovs_cb;
         int err;
 
+        ovs_cb = *OVS_CB(skb);
         segs = __skb_gso_segment(skb, NETIF_F_SG, false);
+        *OVS_CB(skb) = ovs_cb;
         if (IS_ERR(segs))
                 return PTR_ERR(segs);
         if (segs == NULL)
                 return -EINVAL;
 
+        if (gso_type & SKB_GSO_UDP) {
+                /* The initial flow key extracted by ovs_flow_key_extract()
+                 * in this case is for a first fragment, so we need to
+                 * properly mark later fragments.
+                 */
+                later_key = *key;
+                later_key.ip.frag = OVS_FRAG_TYPE_LATER;
+        }
+
         /* Queue all of the segments. */
         skb = segs;
         do {
-                err = queue_userspace_packet(dp, skb, upcall_info);
+                *OVS_CB(skb) = ovs_cb;
+                if (gso_type & SKB_GSO_UDP && skb != segs)
+                        key = &later_key;
+
+                err = queue_userspace_packet(dp, skb, key, upcall_info);
                 if (err)
                         break;
 
-                if (skb == segs && gso_type & SKB_GSO_UDP) {
-                        /* The initial flow key extracted by ovs_flow_extract()
-                         * in this case is for a first fragment, so we need to
-                         * properly mark later fragments.
-                         */
-                        later_key = *upcall_info->key;
-                        later_key.ip.frag = OVS_FRAG_TYPE_LATER;
-
-                        later_info = *upcall_info;
-                        later_info.key = &later_key;
-                        upcall_info = &later_info;
-                }
         } while ((skb = skb->next));
 
         /* Free all of the segments. */
@@ -360,46 +382,26 @@ static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
         return err;
 }
 
-static size_t key_attr_size(void)
-{
-        return    nla_total_size(4)   /* OVS_KEY_ATTR_PRIORITY */
-                + nla_total_size(0)   /* OVS_KEY_ATTR_TUNNEL */
-                  + nla_total_size(8)   /* OVS_TUNNEL_KEY_ATTR_ID */
-                  + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */
-                  + nla_total_size(4)   /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */
-                  + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TOS */
-                  + nla_total_size(1)   /* OVS_TUNNEL_KEY_ATTR_TTL */
-                  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */
-                  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_CSUM */
-                  + nla_total_size(0)   /* OVS_TUNNEL_KEY_ATTR_OAM */
-                  + nla_total_size(256)   /* OVS_TUNNEL_KEY_ATTR_GENEVE_OPTS */
-                + nla_total_size(4)   /* OVS_KEY_ATTR_IN_PORT */
-                + nla_total_size(4)   /* OVS_KEY_ATTR_SKB_MARK */
-                + nla_total_size(12)  /* OVS_KEY_ATTR_ETHERNET */
-                + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
-                + nla_total_size(4)   /* OVS_KEY_ATTR_8021Q */
-                + nla_total_size(0)   /* OVS_KEY_ATTR_ENCAP */
-                + nla_total_size(2)   /* OVS_KEY_ATTR_ETHERTYPE */
-                + nla_total_size(40)  /* OVS_KEY_ATTR_IPV6 */
-                + nla_total_size(2)   /* OVS_KEY_ATTR_ICMPV6 */
-                + nla_total_size(28); /* OVS_KEY_ATTR_ND */
-}
-
-static size_t upcall_msg_size(const struct nlattr *userdata,
+static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
                               unsigned int hdrlen)
 {
         size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
                 + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */
-                + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */
+                + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */
 
         /* OVS_PACKET_ATTR_USERDATA */
-        if (userdata)
-                size += NLA_ALIGN(userdata->nla_len);
+        if (upcall_info->userdata)
+                size += NLA_ALIGN(upcall_info->userdata->nla_len);
+
+        /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
+        if (upcall_info->egress_tun_info)
+                size += nla_total_size(ovs_tun_key_attr_size());
 
         return size;
 }
 
 static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
+                                  const struct sw_flow_key *key,
                                   const struct dp_upcall_info *upcall_info)
 {
         struct ovs_header *upcall;
@@ -450,7 +452,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
         else
                 hlen = skb->len;
 
-        len = upcall_msg_size(upcall_info->userdata, hlen);
+        len = upcall_msg_size(upcall_info, hlen);
         user_skb = genlmsg_new_unicast(len, &info, GFP_ATOMIC);
         if (!user_skb) {
                 err = -ENOMEM;
@@ -462,7 +464,7 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
         upcall->dp_ifindex = dp_ifindex;
 
         nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
-        err = ovs_nla_put_flow(upcall_info->key, upcall_info->key, user_skb);
+        err = ovs_nla_put_flow(key, key, user_skb);
         BUG_ON(err);
         nla_nest_end(user_skb, nla);
 
@@ -471,6 +473,14 @@ static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
                           nla_len(upcall_info->userdata),
                           nla_data(upcall_info->userdata));
 
+        if (upcall_info->egress_tun_info) {
+                nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY);
+                err = ovs_nla_put_egress_tunnel_key(user_skb,
+                                                    upcall_info->egress_tun_info);
+                BUG_ON(err);
+                nla_nest_end(user_skb, nla);
+        }
+
         /* Only reserve room for attribute header, packet data is added
          * in skb_zerocopy() */
         if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) {
@@ -510,11 +520,13 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
         struct sw_flow_actions *acts;
         struct sk_buff *packet;
         struct sw_flow *flow;
+        struct sw_flow_actions *sf_acts;
         struct datapath *dp;
         struct ethhdr *eth;
         struct vport *input_vport;
         int len;
         int err;
+        bool log = !a[OVS_FLOW_ATTR_PROBE];
 
         err = -EINVAL;
         if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
@@ -548,29 +560,22 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
                 goto err_kfree_skb;
 
         err = ovs_flow_key_extract_userspace(a[OVS_PACKET_ATTR_KEY], packet,
-                                             &flow->key);
+                                             &flow->key, log);
         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))
-                goto err_flow_free;
-
         err = ovs_nla_copy_actions(a[OVS_PACKET_ATTR_ACTIONS],
-                                   &flow->key, 0, &acts);
+                                   &flow->key, &acts, log);
         if (err)
                 goto err_flow_free;
 
         rcu_assign_pointer(flow->sf_acts, acts);
-
         OVS_CB(packet)->egress_tun_info = NULL;
-        OVS_CB(packet)->flow = flow;
         packet->priority = flow->key.phy.priority;
         packet->mark = flow->key.phy.skb_mark;
 
         rcu_read_lock();
-        dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+        dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
         err = -ENODEV;
         if (!dp)
                 goto err_unlock;
@@ -583,9 +588,10 @@ static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
                 goto err_unlock;
 
         OVS_CB(packet)->input_vport = input_vport;
+        sf_acts = rcu_dereference(flow->sf_acts);
 
         local_bh_disable();
-        err = ovs_execute_actions(dp, packet, &flow->key);
+        err = ovs_execute_actions(dp, packet, sf_acts, &flow->key);
         local_bh_enable();
         rcu_read_unlock();
 
@@ -628,7 +634,7 @@ static struct genl_family dp_packet_genl_family = {
         .n_ops = ARRAY_SIZE(dp_packet_genl_ops),
 };
 
-static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
+static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
                          struct ovs_dp_megaflow_stats *mega_stats)
 {
         int i;
@@ -662,8 +668,8 @@ static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats,
 static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 {
         return NLMSG_ALIGN(sizeof(struct ovs_header))
-                + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */
-                + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */
+                + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_KEY */
+                + nla_total_size(ovs_key_attr_size()) /* OVS_FLOW_ATTR_MASK */
                 + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
                 + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */
                 + nla_total_size(8) /* OVS_FLOW_ATTR_USED */
@@ -671,58 +677,67 @@ static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts)
 }
 
 /* Called with ovs_mutex or RCU read lock. */
-static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
-                                  struct sk_buff *skb, u32 portid,
-                                  u32 seq, u32 flags, u8 cmd)
+static int ovs_flow_cmd_fill_match(const struct sw_flow *flow,
+                                   struct sk_buff *skb)
 {
-        const int skb_orig_len = skb->len;
-        struct nlattr *start;
-        struct ovs_flow_stats stats;
-        __be16 tcp_flags;
-        unsigned long used;
-        struct ovs_header *ovs_header;
         struct nlattr *nla;
         int err;
 
-        ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd);
-        if (!ovs_header)
-                return -EMSGSIZE;
-
-        ovs_header->dp_ifindex = dp_ifindex;
-
         /* Fill flow key. */
         nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
         if (!nla)
-                goto nla_put_failure;
+                return -EMSGSIZE;
 
         err = ovs_nla_put_flow(&flow->unmasked_key, &flow->unmasked_key, skb);
         if (err)
-                goto error;
+                return err;
+
         nla_nest_end(skb, nla);
 
+        /* Fill flow mask. */
         nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK);
         if (!nla)
-                goto nla_put_failure;
+                return -EMSGSIZE;
 
         err = ovs_nla_put_flow(&flow->key, &flow->mask->key, skb);
         if (err)
-                goto error;
+                return err;
 
         nla_nest_end(skb, nla);
+        return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
+                                   struct sk_buff *skb)
+{
+        struct ovs_flow_stats stats;
+        __be16 tcp_flags;
+        unsigned long used;
 
         ovs_flow_stats_get(flow, &stats, &used, &tcp_flags);
 
         if (used &&
             nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)))
-                goto nla_put_failure;
+                return -EMSGSIZE;
 
         if (stats.n_packets &&
             nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats))
-                goto nla_put_failure;
+                return -EMSGSIZE;
 
         if ((u8)ntohs(tcp_flags) &&
              nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags)))
-                goto nla_put_failure;
+                return -EMSGSIZE;
+
+        return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
+                                     struct sk_buff *skb, int skb_orig_len)
+{
+        struct nlattr *start;
+        int err;
 
         /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
          * this is the first flow to be dumped into 'skb'.  This is unusual for
@@ -746,17 +761,47 @@ static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
                         nla_nest_end(skb, start);
                 else {
                         if (skb_orig_len)
-                                goto error;
+                                return err;
 
                         nla_nest_cancel(skb, start);
                 }
-        } else if (skb_orig_len)
-                goto nla_put_failure;
+        } else if (skb_orig_len) {
+                return -EMSGSIZE;
+        }
+
+        return 0;
+}
+
+/* Called with ovs_mutex or RCU read lock. */
+static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
+                                  struct sk_buff *skb, u32 portid,
+                                  u32 seq, u32 flags, u8 cmd)
+{
+        const int skb_orig_len = skb->len;
+        struct ovs_header *ovs_header;
+        int err;
+
+        ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family,
+                                 flags, cmd);
+        if (!ovs_header)
+                return -EMSGSIZE;
+
+        ovs_header->dp_ifindex = dp_ifindex;
+
+        err = ovs_flow_cmd_fill_match(flow, skb);
+        if (err)
+                goto error;
+
+        err = ovs_flow_cmd_fill_stats(flow, skb);
+        if (err)
+                goto error;
+
+        err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
+        if (err)
+                goto error;
 
         return genlmsg_end(skb, ovs_header);
 
-nla_put_failure:
-        err = -EMSGSIZE;
 error:
         genlmsg_cancel(skb, ovs_header);
         return err;
@@ -811,13 +856,18 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
         struct sw_flow_actions *acts;
         struct sw_flow_match match;
         int error;
+        bool log = !a[OVS_FLOW_ATTR_PROBE];
 
         /* Must have key and actions. */
         error = -EINVAL;
-        if (!a[OVS_FLOW_ATTR_KEY])
+        if (!a[OVS_FLOW_ATTR_KEY]) {
+                OVS_NLERR(log, "Flow key attr not present in new flow.");
                 goto error;
-        if (!a[OVS_FLOW_ATTR_ACTIONS])
+        }
+        if (!a[OVS_FLOW_ATTR_ACTIONS]) {
+                OVS_NLERR(log, "Flow actions attr not present in new flow.");
                 goto error;
+        }
 
         /* Most of the time we need to allocate a new flow, do it before
          * locking.
@@ -830,24 +880,19 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
 
         /* Extract key. */
         ovs_match_init(&match, &new_flow->unmasked_key, &mask);
-        error = ovs_nla_get_match(&match,
-                                  a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
+        error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
+                                  a[OVS_FLOW_ATTR_MASK], log);
         if (error)
                 goto err_kfree_flow;
 
         ovs_flow_mask_key(&new_flow->key, &new_flow->unmasked_key, &mask);
 
         /* Validate actions. */
-        acts = ovs_nla_alloc_flow_actions(nla_len(a[OVS_FLOW_ATTR_ACTIONS]));
-        error = PTR_ERR(acts);
-        if (IS_ERR(acts))
-                goto err_kfree_flow;
-
         error = ovs_nla_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], &new_flow->key,
-                                     0, &acts);
+                                     &acts, log);
         if (error) {
-                OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
-                goto err_kfree_acts;
+                OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
+                goto err_kfree_flow;
         }
 
         reply = ovs_flow_cmd_alloc_info(acts, info, false);
@@ -899,6 +944,7 @@ static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
                 }
                 /* The unmasked key has to be the same for flow updates. */
                 if (unlikely(!ovs_flow_cmp_unmasked_key(flow, &match))) {
+                        /* Look for any overlapping flow. */
                         flow = ovs_flow_tbl_lookup_exact(&dp->table, &match);
                         if (!flow) {
                                 error = -ENOENT;
@@ -938,23 +984,21 @@ error:
         return error;
 }
 
+/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
 static struct sw_flow_actions *get_flow_actions(const struct nlattr *a,
                                                 const struct sw_flow_key *key,
-                                                const struct sw_flow_mask *mask)
+                                                const struct sw_flow_mask *mask,
+                                                bool log)
 {
         struct sw_flow_actions *acts;
         struct sw_flow_key masked_key;
         int error;
 
-        acts = ovs_nla_alloc_flow_actions(nla_len(a));
-        if (IS_ERR(acts))
-                return acts;
-
         ovs_flow_mask_key(&masked_key, key, mask);
-        error = ovs_nla_copy_actions(a, &masked_key, 0, &acts);
+        error = ovs_nla_copy_actions(a, &masked_key, &acts, log);
         if (error) {
-                OVS_NLERR("Flow actions may not be safe on all matching packets.\n");
-                kfree(acts);
+                OVS_NLERR(log,
+                          "Actions may not be safe on all matching packets");
                 return ERR_PTR(error);
         }
 
@@ -973,29 +1017,31 @@ static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
         struct sw_flow_actions *old_acts = NULL, *acts = NULL;
         struct sw_flow_match match;
         int error;
+        bool log = !a[OVS_FLOW_ATTR_PROBE];
 
         /* Extract key. */
         error = -EINVAL;
-        if (!a[OVS_FLOW_ATTR_KEY])
+        if (!a[OVS_FLOW_ATTR_KEY]) {
+                OVS_NLERR(log, "Flow key attribute not present in set flow.");
                 goto error;
+        }
 
         ovs_match_init(&match, &key, &mask);
-        error = ovs_nla_get_match(&match,
-                                  a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]);
+        error = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY],
+                                  a[OVS_FLOW_ATTR_MASK], log);
         if (error)
                 goto error;
 
         /* Validate actions. */
         if (a[OVS_FLOW_ATTR_ACTIONS]) {
-                acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask);
+                acts = get_flow_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, &mask,
+                                        log);
                 if (IS_ERR(acts)) {
                         error = PTR_ERR(acts);
                         goto error;
                 }
-        }
 
-        /* Can allocate before locking if have acts. */
-        if (acts) {
+                /* Can allocate before locking if have acts. */
                 reply = ovs_flow_cmd_alloc_info(acts, info, false);
                 if (IS_ERR(reply)) {
                         error = PTR_ERR(reply);
@@ -1070,14 +1116,16 @@ static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
         struct datapath *dp;
         struct sw_flow_match match;
         int err;
+        bool log = !a[OVS_FLOW_ATTR_PROBE];
 
         if (!a[OVS_FLOW_ATTR_KEY]) {
-                OVS_NLERR("Flow get message rejected, Key attribute missing.\n");
+                OVS_NLERR(log,
+                          "Flow get message rejected, Key attribute missing.");
                 return -EINVAL;
         }
 
         ovs_match_init(&match, &key, NULL);
-        err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
+        err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL, log);
         if (err)
                 return err;
 
@@ -1118,10 +1166,12 @@ static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
         struct datapath *dp;
         struct sw_flow_match match;
         int err;
+        bool log = !a[OVS_FLOW_ATTR_PROBE];
 
         if (likely(a[OVS_FLOW_ATTR_KEY])) {
                 ovs_match_init(&match, &key, NULL);
-                err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL);
+                err = ovs_nla_get_match(&match, a[OVS_FLOW_ATTR_KEY], NULL,
+                                        log);
                 if (unlikely(err))
                         return err;
         }
@@ -1179,7 +1229,7 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
         struct datapath *dp;
 
         rcu_read_lock();
-        dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+        dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
         if (!dp) {
                 rcu_read_unlock();
                 return -ENODEV;
@@ -1211,8 +1261,10 @@ static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
 
 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
         [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
+        [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
         [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
         [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
+        [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
 };
 
 static const struct genl_ops dp_flow_genl_ops[] = {
@@ -1313,7 +1365,7 @@ static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info)
 
 /* Called with rcu_read_lock or ovs_mutex. */
 static struct datapath *lookup_datapath(struct net *net,
-                                        struct ovs_header *ovs_header,
+                                        const struct ovs_header *ovs_header,
                                         struct nlattr *a[OVS_DP_ATTR_MAX + 1])
 {
         struct datapath *dp;
@@ -1341,7 +1393,7 @@ static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *in
         dp->user_features = 0;
 }
 
-static void ovs_dp_change(struct datapath *dp, struct nlattr **a)
+static void ovs_dp_change(struct datapath *dp, struct nlattr *a[])
 {
         if (a[OVS_DP_ATTR_USER_FEATURES])
                 dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]);
@@ -1442,7 +1494,7 @@ err_destroy_ports_array:
 err_destroy_percpu:
         free_percpu(dp->stats_percpu);
 err_destroy_table:
-        ovs_flow_tbl_destroy(&dp->table, false);
+        ovs_flow_tbl_destroy(&dp->table);
 err_free_dp:
         release_net(ovs_dp_get_net(dp));
         kfree(dp);
@@ -1474,8 +1526,6 @@ static void __dp_destroy(struct datapath *dp)
         ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL));
 
         /* RCU destroy the flow table */
-        ovs_flow_tbl_destroy(&dp->table, true);
-
         call_rcu(&dp->rcu, destroy_dp_rcu);
 }
 
@@ -1707,7 +1757,7 @@ struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid,
 
 /* Called with ovs_mutex or RCU read lock. */
 static struct vport *lookup_vport(struct net *net,
-                                  struct ovs_header *ovs_header,
+                                  const struct ovs_header *ovs_header,
                                   struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
 {
         struct datapath *dp;
@@ -1764,6 +1814,7 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
                 return -ENOMEM;
 
         ovs_lock();
+restart:
         dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
         err = -ENODEV;
         if (!dp)
@@ -1795,8 +1846,11 @@ static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
 
         vport = new_vport(&parms);
         err = PTR_ERR(vport);
-        if (IS_ERR(vport))
+        if (IS_ERR(vport)) {
+                if (err == -EAGAIN)
+                        goto restart;
                 goto exit_unlock_free;
+        }
 
         err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid,
                                       info->snd_seq, 0, OVS_VPORT_CMD_NEW);
@@ -1939,7 +1993,7 @@ static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
         int i, j = 0;
 
         rcu_read_lock();
-        dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex);
+        dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex);
         if (!dp) {
                 rcu_read_unlock();
                 return -ENODEV;
@@ -2112,12 +2166,18 @@ static int __init dp_init(void)
         if (err)
                 goto error_netns_exit;
 
+        err = ovs_netdev_init();
+        if (err)
+                goto error_unreg_notifier;
+
         err = dp_register_genl();
         if (err < 0)
-                goto error_unreg_notifier;
+                goto error_unreg_netdev;
 
         return 0;
 
+error_unreg_netdev:
+        ovs_netdev_exit();
 error_unreg_notifier:
         unregister_netdevice_notifier(&ovs_dp_device_notifier);
 error_netns_exit:
@@ -2137,6 +2197,7 @@ error:
 static void dp_cleanup(void)
 {
         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
+        ovs_netdev_exit();
         unregister_netdevice_notifier(&ovs_dp_device_notifier);
         unregister_pernet_device(&ovs_net_ops);
         rcu_barrier();