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Message-ID: <4AFCF06B.1090602@gmail.com>
Date: Fri, 13 Nov 2009 13:36:43 +0800
From: Changli Gao <xiaosuo@...il.com>
To: Jamal Hadi Salim <hadi@...erus.ca>
CC: Stephen Hemminger <shemminger@...tta.com>,
"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
xiaosuo <xiaosuo@...il.com>
Subject: [PATCH] act_mirred: cleanup and optimization
act_mirred: cleanup and optimization.
cleanup and optimization.
1. don't let go back using goto.
2. move checking if eaction is valid in tcf_mirred_init().
3. don't call skb_act_clone() until it is necessary.
4. one exit of the critical context.
5. allow eaction is TCA_INGRESS_MIRROR & TCA_INGRESS_REDIR.
Signed-off-by: Changli Gao <xiaosuo@...il.com>
----
net/sched/act_mirred.c | 121
++++++++++++++++++++++++++-----------------------
1 file changed, 65 insertions(+), 56 deletions(-)
diff --git a/net/sched/act_mirred.c b/net/sched/act_mirred.c
index b9aaab4..1e8b042 100644
--- a/net/sched/act_mirred.c
+++ b/net/sched/act_mirred.c
@@ -8,8 +8,6 @@
*
* Authors: Jamal Hadi Salim (2002-4)
*
- * TODO: Add ingress support (and socket redirect support)
- *
*/
#include <linux/types.h>
@@ -65,52 +63,63 @@ 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:
+ case TCA_INGRESS_MIRROR:
+ case TCA_INGRESS_REDIR:
+ break;
+ default:
+ return -EINVAL;
+ }
if (parm->ifindex) {
- dev = __dev_get_by_index(&init_net, 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);
+ if (IS_ERR(pc)) {
+ dev_put(dev);
+ return PTR_ERR(pc);
+ }
ret = ACT_P_CREATED;
} else {
if (!ovr) {
tcf_mirred_release(to_mirred(pc), bind);
+ if (dev != NULL)
+ dev_put(dev);
return -EEXIST;
}
}
@@ -119,12 +128,11 @@ 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_ok_push = ok_push;
}
spin_unlock_bh(&m->tcf_lock);
@@ -146,59 +154,60 @@ static int tcf_mirred_cleanup(struct tc_action *a, int bind)
static int tcf_mirred(struct sk_buff *skb, struct tc_action *a,
struct tcf_result *res)
{
- 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;
+ struct tcf_mirred *m = a->priv;
+ int retval, err = 1;
spin_lock(&m->tcf_lock);
-
- dev = m->tcfm_dev;
m->tcf_tm.lastuse = jiffies;
- if (!(dev->flags&IFF_UP) ) {
+ dev = m->tcfm_dev;
+ 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;
+ goto out;
}
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;
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)
+ if (m->tcfm_eaction != TCA_EGRESS_MIRROR &&
+ m->tcfm_eaction != TCA_INGRESS_MIRROR)
skb2->tc_verd = SET_TC_FROM(skb2->tc_verd, at);
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)
--
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