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>

1 files changed, 29 insertions, 31 deletions

diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index b812c20b66c6..797479369881 100644
--- 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)) {