openvswitch: kernel datapath clone action

Add 'clone' action to kernel datapath by using existing functions.
When actions within clone don't modify the current flow, the flow
key is not cloned before executing clone actions.

This is a follow up patch for this incomplete work:
https://patchwork.ozlabs.org/patch/722096/

v1 -> v2:
Refactor as advised by reviewer.

Signed-off-by: Yifeng Sun <pkusunyifeng@gmail.com>
Signed-off-by: Andy Zhou <azhou@ovn.org>
Acked-by: Pravin B Shelar <pshelar@ovn.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 106 insertions, 0 deletions

diff --git a/net/openvswitch/actions.c b/net/openvswitch/actions.c
index 30a5df27116e..85ae53d8fd09 100644
--- a/net/openvswitch/actions.c
+++ b/net/openvswitch/actions.c
@@ -1057,6 +1057,28 @@ static int sample(struct datapath *dp, struct sk_buff *skb,
                              clone_flow_key);
 }
 
+/* When 'last' is true, clone() should always consume the 'skb'.
+ * Otherwise, clone() should keep 'skb' intact regardless what
+ * actions are executed within clone().
+ */
+static int clone(struct datapath *dp, struct sk_buff *skb,
+                 struct sw_flow_key *key, const struct nlattr *attr,
+                 bool last)
+{
+        struct nlattr *actions;
+        struct nlattr *clone_arg;
+        int rem = nla_len(attr);
+        bool dont_clone_flow_key;
+
+        /* The first action is always 'OVS_CLONE_ATTR_ARG'. */
+        clone_arg = nla_data(attr);
+        dont_clone_flow_key = nla_get_u32(clone_arg);
+        actions = nla_next(clone_arg, &rem);
+
+        return clone_execute(dp, skb, key, 0, actions, rem, last,
+                             !dont_clone_flow_key);
+}
+
 static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
                          const struct nlattr *attr)
 {
@@ -1336,6 +1358,17 @@ static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
                                 consume_skb(skb);
                                 return 0;
                         }
+                        break;
+
+                case OVS_ACTION_ATTR_CLONE: {
+                        bool last = nla_is_last(a, rem);
+
+                        err = clone(dp, skb, key, a, last);
+                        if (last)
+                                return err;
+
+                        break;
+                }
                 }
 
                 if (unlikely(err)) {
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c
index 391c4073a6dc..a70097ecf33c 100644
--- a/net/openvswitch/flow_netlink.c
+++ b/net/openvswitch/flow_netlink.c
@@ -2460,6 +2460,40 @@ static int validate_and_copy_sample(struct net *net, const struct nlattr *attr,
         return 0;
 }
 
+static int validate_and_copy_clone(struct net *net,
+                                   const struct nlattr *attr,
+                                   const struct sw_flow_key *key,
+                                   struct sw_flow_actions **sfa,
+                                   __be16 eth_type, __be16 vlan_tci,
+                                   bool log, bool last)
+{
+        int start, err;
+        u32 exec;
+
+        if (nla_len(attr) && nla_len(attr) < NLA_HDRLEN)
+                return -EINVAL;
+
+        start = add_nested_action_start(sfa, OVS_ACTION_ATTR_CLONE, log);
+        if (start < 0)
+                return start;
+
+        exec = last || !actions_may_change_flow(attr);
+
+        err = ovs_nla_add_action(sfa, OVS_CLONE_ATTR_EXEC, &exec,
+                                 sizeof(exec), log);
+        if (err)
+                return err;
+
+        err = __ovs_nla_copy_actions(net, attr, key, sfa,
+                                     eth_type, vlan_tci, log);
+        if (err)
+                return err;
+
+        add_nested_action_end(*sfa, start);
+
+        return 0;
+}
+
 void ovs_match_init(struct sw_flow_match *match,
                     struct sw_flow_key *key,
                     bool reset_key,
@@ -2849,6 +2883,7 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
                         [OVS_ACTION_ATTR_PUSH_NSH] = (u32)-1,
                         [OVS_ACTION_ATTR_POP_NSH] = 0,
                         [OVS_ACTION_ATTR_METER] = sizeof(u32),
+                        [OVS_ACTION_ATTR_CLONE] = (u32)-1,
                 };
                 const struct ovs_action_push_vlan *vlan;
                 int type = nla_type(a);
@@ -3038,6 +3073,18 @@ static int __ovs_nla_copy_actions(struct net *net, const struct nlattr *attr,
                         /* Non-existent meters are simply ignored.  */
                         break;
 
+                case OVS_ACTION_ATTR_CLONE: {
+                        bool last = nla_is_last(a, rem);
+
+                        err = validate_and_copy_clone(net, a, key, sfa,
+                                                      eth_type, vlan_tci,
+                                                      log, last);
+                        if (err)
+                                return err;
+                        skip_copy = true;
+                        break;
+                }
+
                 default:
                         OVS_NLERR(log, "Unknown Action type %d", type);
                         return -EINVAL;
@@ -3116,6 +3163,26 @@ out:
         return err;
 }
 
+static int clone_action_to_attr(const struct nlattr *attr,
+                                struct sk_buff *skb)
+{
+        struct nlattr *start;
+        int err = 0, rem = nla_len(attr);
+
+        start = nla_nest_start(skb, OVS_ACTION_ATTR_CLONE);
+        if (!start)
+                return -EMSGSIZE;
+
+        err = ovs_nla_put_actions(nla_data(attr), rem, skb);
+
+        if (err)
+                nla_nest_cancel(skb, start);
+        else
+                nla_nest_end(skb, start);
+
+        return err;
+}
+
 static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb)
 {
         const struct nlattr *ovs_key = nla_data(a);
@@ -3204,6 +3271,12 @@ int ovs_nla_put_actions(const struct nlattr *attr, int len, struct sk_buff *skb)
                                 return err;
                         break;
 
+                case OVS_ACTION_ATTR_CLONE:
+                        err = clone_action_to_attr(a, skb);
+                        if (err)
+                                return err;
+                        break;
+
                 default:
                         if (nla_put(skb, type, nla_len(a), nla_data(a)))
                                 return -EMSGSIZE;