act_mirred: optimization.

move checking if eaction is valid in tcf_mirred_init()

Signed-off-by: Changli Gao <xiaosuo@gmail.com>
Signed-off-by: Jamal Hadi Salim <hadi@cyberus.ca>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index b812c20..7974793 100644 (file)
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -65,48 +65,53 @@ static int tcf_mirred_init(struct nlattr *nla, struct nlattr *est,
        struct tc_mirred *parm;
        struct tcf_mirred *m;
        struct tcf_common *pc;
-       struct net_device *dev = NULL;
-       int ret = 0, err;
-       int ok_push = 0;
+       struct net_device *dev;
+       int ret, ok_push = 0;
 
        if (nla == NULL)
                return -EINVAL;
-
-       err = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
-       if (err < 0)
-               return err;
-
+       ret = nla_parse_nested(tb, TCA_MIRRED_MAX, nla, mirred_policy);
+       if (ret < 0)
+               return ret;
        if (tb[TCA_MIRRED_PARMS] == NULL)
                return -EINVAL;
        parm = nla_data(tb[TCA_MIRRED_PARMS]);
-
+       switch (parm->eaction) {
+       case TCA_EGRESS_MIRROR:
+       case TCA_EGRESS_REDIR:
+               break;
+       default:
+               return -EINVAL;
+       }
        if (parm->ifindex) {
                dev = __dev_get_by_index(&init_net, parm->ifindex);
                if (dev == NULL)
                        return -ENODEV;
                switch (dev->type) {
-                       case ARPHRD_TUNNEL:
-                       case ARPHRD_TUNNEL6:
-                       case ARPHRD_SIT:
-                       case ARPHRD_IPGRE:
-                       case ARPHRD_VOID:
-                       case ARPHRD_NONE:
-                               ok_push = 0;
-                               break;
-                       default:
-                               ok_push = 1;
-                               break;
+               case ARPHRD_TUNNEL:
+               case ARPHRD_TUNNEL6:
+               case ARPHRD_SIT:
+               case ARPHRD_IPGRE:
+               case ARPHRD_VOID:
+               case ARPHRD_NONE:
+                       ok_push = 0;
+                       break;
+               default:
+                       ok_push = 1;
+                       break;
                }
+       } else {
+               dev = NULL;
        }
 
        pc = tcf_hash_check(parm->index, a, bind, &mirred_hash_info);
        if (!pc) {
-               if (!parm->ifindex)
+               if (dev == NULL)
                        return -EINVAL;
                pc = tcf_hash_create(parm->index, est, a, sizeof(*m), bind,
                                     &mirred_idx_gen, &mirred_hash_info);
                if (IS_ERR(pc))
-                   return PTR_ERR(pc);
+                       return PTR_ERR(pc);
                ret = ACT_P_CREATED;
        } else {
                if (!ovr) {
@@ -119,12 +124,12 @@ static int tcf_mirred_init(struct nlattr *nla, struct nlattr *est,
        spin_lock_bh(&m->tcf_lock);
        m->tcf_action = parm->action;
        m->tcfm_eaction = parm->eaction;
-       if (parm->ifindex) {
+       if (dev != NULL) {
                m->tcfm_ifindex = parm->ifindex;
                if (ret != ACT_P_CREATED)
                        dev_put(m->tcfm_dev);
-               m->tcfm_dev = dev;
                dev_hold(dev);
+               m->tcfm_dev = dev;
                m->tcfm_ok_push = ok_push;
        }
        spin_unlock_bh(&m->tcf_lock);
@@ -154,13 +159,6 @@ static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
 
        spin_lock(&m->tcf_lock);
        m->tcf_tm.lastuse = jiffies;
-       if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
-           m->tcfm_eaction != TCA_EGRESS_REDIR) {
-               if (net_ratelimit())
-                       printk("tcf_mirred unknown action %d\n",
-                              m->tcfm_eaction);
-               goto out;
-       }
 
        dev = m->tcfm_dev;
        if (!(dev->flags & IFF_UP)) {