net_sched: move tc_action into tcf_common

struct tc_action is confusing, currently we use it for two purposes:
1) Pass in arguments and carry out results from helper functions
2) A generic representation for tc actions

The first one is error-prone, since we need to make sure we don't
miss anything. This patch aims to get rid of this use, by moving
tc_action into tcf_common, so that they are allocated together
in hashtable and can be cast'ed easily.

And together with the following patch, we could really make
tc_action a generic representation for all tc actions and each
type of action can inherit from it.

Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 12 deletions

diff --git a/net/sched/act_skbedit.c b/net/sched/act_skbedit.c
index 8e573c0f8742..a133dcb82132 100644
--- a/net/sched/act_skbedit.c
+++ b/net/sched/act_skbedit.c
@@ -30,11 +30,12 @@
 #define SKBEDIT_TAB_MASK     15
 
 static int skbedit_net_id;
+static struct tc_action_ops act_skbedit_ops;
 
 static int tcf_skbedit(struct sk_buff *skb, const struct tc_action *a,
 		       struct tcf_result *res)
 {
-	struct tcf_skbedit *d = a->priv;
+	struct tcf_skbedit *d = to_skbedit(a);
 
 	spin_lock(&d->tcf_lock);
 	tcf_lastuse_update(&d->tcf_tm);
@@ -63,7 +64,7 @@ static const struct nla_policy skbedit_policy[TCA_SKBEDIT_MAX + 1] = {
 };
 
 static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
-			    struct nlattr *est, struct tc_action *a,
+			    struct nlattr *est, struct tc_action **a,
 			    int ovr, int bind)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
@@ -114,21 +115,21 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 		return 0;
 
 	if (!flags) {
-		tcf_hash_release(a, bind);
+		tcf_hash_release(*a, bind);
 		return -EINVAL;
 	}
 
 	if (!exists) {
 		ret = tcf_hash_create(tn, parm->index, est, a,
-				      sizeof(*d), bind, false);
+				      &act_skbedit_ops, bind, false);
 		if (ret)
 			return ret;
 
-		d = to_skbedit(a);
+		d = to_skbedit(*a);
 		ret = ACT_P_CREATED;
 	} else {
-		d = to_skbedit(a);
-		tcf_hash_release(a, bind);
+		d = to_skbedit(*a);
+		tcf_hash_release(*a, bind);
 		if (!ovr)
 			return -EEXIST;
 	}
@@ -150,7 +151,7 @@ static int tcf_skbedit_init(struct net *net, struct nlattr *nla,
 	spin_unlock_bh(&d->tcf_lock);
 
 	if (ret == ACT_P_CREATED)
-		tcf_hash_insert(tn, a);
+		tcf_hash_insert(tn, *a);
 	return ret;
 }
 
@@ -158,7 +159,7 @@ static int tcf_skbedit_dump(struct sk_buff *skb, struct tc_action *a,
 			    int bind, int ref)
 {
 	unsigned char *b = skb_tail_pointer(skb);
-	struct tcf_skbedit *d = a->priv;
+	struct tcf_skbedit *d = to_skbedit(a);
 	struct tc_skbedit opt = {
 		.index   = d->tcf_index,
 		.refcnt  = d->tcf_refcnt - ref,
@@ -194,14 +195,14 @@ nla_put_failure:
 
 static int tcf_skbedit_walker(struct net *net, struct sk_buff *skb,
 			      struct netlink_callback *cb, int type,
-			      struct tc_action *a)
+			      const struct tc_action_ops *ops)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 
-	return tcf_generic_walker(tn, skb, cb, type, a);
+	return tcf_generic_walker(tn, skb, cb, type, ops);
 }
 
-static int tcf_skbedit_search(struct net *net, struct tc_action *a, u32 index)
+static int tcf_skbedit_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, skbedit_net_id);
 
@@ -217,6 +218,7 @@ static struct tc_action_ops act_skbedit_ops = {
 	.init		=	tcf_skbedit_init,
 	.walk		=	tcf_skbedit_walker,
 	.lookup		=	tcf_skbedit_search,
+	.size		=	sizeof(struct tcf_skbedit),
 };
 
 static __net_init int skbedit_init_net(struct net *net)