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, 15 insertions, 13 deletions

diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
index 82d3c1479029..b54d56d4959b 100644
--- a/net/sched/act_pedit.c
+++ b/net/sched/act_pedit.c
@@ -26,13 +26,14 @@
 #define PEDIT_TAB_MASK	15
 
 static int pedit_net_id;
+static struct tc_action_ops act_pedit_ops;
 
 static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
 	[TCA_PEDIT_PARMS]	= { .len = sizeof(struct tc_pedit) },
 };
 
 static int tcf_pedit_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, pedit_net_id);
@@ -61,23 +62,23 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 		if (!parm->nkeys)
 			return -EINVAL;
 		ret = tcf_hash_create(tn, parm->index, est, a,
-				      sizeof(*p), bind, false);
+				      &act_pedit_ops, bind, false);
 		if (ret)
 			return ret;
-		p = to_pedit(a);
+		p = to_pedit(*a);
 		keys = kmalloc(ksize, GFP_KERNEL);
 		if (keys == NULL) {
-			tcf_hash_cleanup(a, est);
+			tcf_hash_cleanup(*a, est);
 			return -ENOMEM;
 		}
 		ret = ACT_P_CREATED;
 	} else {
 		if (bind)
 			return 0;
-		tcf_hash_release(a, bind);
+		tcf_hash_release(*a, bind);
 		if (!ovr)
 			return -EEXIST;
-		p = to_pedit(a);
+		p = to_pedit(*a);
 		if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
 			keys = kmalloc(ksize, GFP_KERNEL);
 			if (keys == NULL)
@@ -96,13 +97,13 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
 	memcpy(p->tcfp_keys, parm->keys, ksize);
 	spin_unlock_bh(&p->tcf_lock);
 	if (ret == ACT_P_CREATED)
-		tcf_hash_insert(tn, a);
+		tcf_hash_insert(tn, *a);
 	return ret;
 }
 
 static void tcf_pedit_cleanup(struct tc_action *a, int bind)
 {
-	struct tcf_pedit *p = a->priv;
+	struct tcf_pedit *p = to_pedit(a);
 	struct tc_pedit_key *keys = p->tcfp_keys;
 	kfree(keys);
 }
@@ -110,7 +111,7 @@ static void tcf_pedit_cleanup(struct tc_action *a, int bind)
 static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
 		     struct tcf_result *res)
 {
-	struct tcf_pedit *p = a->priv;
+	struct tcf_pedit *p = to_pedit(a);
 	int i;
 	unsigned int off;
 
@@ -177,7 +178,7 @@ static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
 			  int bind, int ref)
 {
 	unsigned char *b = skb_tail_pointer(skb);
-	struct tcf_pedit *p = a->priv;
+	struct tcf_pedit *p = to_pedit(a);
 	struct tc_pedit *opt;
 	struct tcf_t t;
 	int s;
@@ -216,14 +217,14 @@ nla_put_failure:
 
 static int tcf_pedit_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, pedit_net_id);
 
-	return tcf_generic_walker(tn, skb, cb, type, a);
+	return tcf_generic_walker(tn, skb, cb, type, ops);
 }
 
-static int tcf_pedit_search(struct net *net, struct tc_action *a, u32 index)
+static int tcf_pedit_search(struct net *net, struct tc_action **a, u32 index)
 {
 	struct tc_action_net *tn = net_generic(net, pedit_net_id);
 
@@ -240,6 +241,7 @@ static struct tc_action_ops act_pedit_ops = {
 	.init		=	tcf_pedit_init,
 	.walk		=	tcf_pedit_walker,
 	.lookup		=	tcf_pedit_search,
+	.size		=	sizeof(struct tcf_pedit),
 };
 
 static __net_init int pedit_init_net(struct net *net)