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act_mirred: cleanup 

1. don't let go back using goto.
2. don't call skb_act_clone() until it is necessary.
3. one exit of the critical context.

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>
This commit is contained in:
Changli Gao 2009-11-17 04:14:00 -08:00 committed by David S. Miller
parent b2a5decddb
commit feed1f1724
1 changed files with 35 additions and 28 deletions
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63
net/sched/act_mirred.c
View File

@ -148,47 +148,39 @@ static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
{
struct tcf_mirred *m = a->priv;
struct net_device *dev;
struct sk_buff *skb2 = NULL;
u32 at = G_TC_AT(skb->tc_verd);
struct sk_buff *skb2;
u32 at;
int retval, err = 1;
spin_lock(&m->tcf_lock);
dev = m->tcfm_dev;
m->tcf_tm.lastuse = jiffies;
if (!(dev->flags&IFF_UP) ) {
if (net_ratelimit())
printk("mirred to Houston: device %s is gone!\n",
dev->name);
bad_mirred:
if (skb2 != NULL)
kfree_skb(skb2);
m->tcf_qstats.overlimits++;
m->tcf_bstats.bytes += qdisc_pkt_len(skb);
m->tcf_bstats.packets++;
spin_unlock(&m->tcf_lock);
/* should we be asking for packet to be dropped?
* may make sense for redirect case only
*/
return TC_ACT_SHOT;
}
skb2 = skb_act_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
goto bad_mirred;
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 bad_mirred;
goto out;
}
dev = m->tcfm_dev;
if (!(dev->flags & IFF_UP)) {
if (net_ratelimit())
printk("mirred to Houston: device %s is gone!\n",
dev->name);
goto out;
}
skb2 = skb_act_clone(skb, GFP_ATOMIC);
if (skb2 == NULL)
goto out;
m->tcf_bstats.bytes += qdisc_pkt_len(skb2);
m->tcf_bstats.packets++;
if (!(at & AT_EGRESS))
at = G_TC_AT(skb->tc_verd);
if (!(at & AT_EGRESS)) {
if (m->tcfm_ok_push)
skb_push(skb2, skb2->dev->hard_header_len);
}
/* mirror is always swallowed */
if (m->tcfm_eaction != TCA_EGRESS_MIRROR)
@ -197,8 +189,23 @@ bad_mirred:
skb2->dev = dev;
skb2->iif = skb->dev->ifindex;
dev_queue_xmit(skb2);
err = 0;
out:
if (err) {
m->tcf_qstats.overlimits++;
m->tcf_bstats.bytes += qdisc_pkt_len(skb);
m->tcf_bstats.packets++;
/* should we be asking for packet to be dropped?
* may make sense for redirect case only
*/
retval = TC_ACT_SHOT;
} else {
retval = m->tcf_action;
}
spin_unlock(&m->tcf_lock);
return m->tcf_action;
return retval;
}
static int tcf_mirred_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)