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authorChangli Gao <xiaosuo@gmail.com>2010-12-15 19:57:25 +0000
committerDavid S. Miller <davem@davemloft.net>2010-12-19 21:50:20 -0800
commit71d9dec24dce548bf699815c976cf063ad9257e2 (patch)
treeaad41859f011a20125acb3a717b3fc3121f108a2 /net/core
parent1a75972c61f2c224eb5283c183f9f6b17fb09b6b (diff)
net: increase skb->users instead of skb_clone()
In dev_queue_xmit_nit(), we have to clone skbs as we need to mangle skbs, however, we don't need to clone skbs for all the packet_types. Except for the first packet_type, we increase skb->users instead of skb_clone(). Signed-off-by: Changli Gao <xiaosuo@gmail.com> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/dev.c30
1 files changed, 20 insertions, 10 deletions
diff --git a/net/core/dev.c b/net/core/dev.c
index 92d414ac0e30..59877290bca7 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1528,6 +1528,14 @@ int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
}
EXPORT_SYMBOL_GPL(dev_forward_skb);
+static inline int deliver_skb(struct sk_buff *skb,
+ struct packet_type *pt_prev,
+ struct net_device *orig_dev)
+{
+ atomic_inc(&skb->users);
+ return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
+}
+
/*
* Support routine. Sends outgoing frames to any network
* taps currently in use.
@@ -1536,6 +1544,8 @@ EXPORT_SYMBOL_GPL(dev_forward_skb);
static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
{
struct packet_type *ptype;
+ struct sk_buff *skb2 = NULL;
+ struct packet_type *pt_prev = NULL;
#ifdef CONFIG_NET_CLS_ACT
if (!(skb->tstamp.tv64 && (G_TC_FROM(skb->tc_verd) & AT_INGRESS)))
@@ -1552,7 +1562,13 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
if ((ptype->dev == dev || !ptype->dev) &&
(ptype->af_packet_priv == NULL ||
(struct sock *)ptype->af_packet_priv != skb->sk)) {
- struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
+ if (pt_prev) {
+ deliver_skb(skb2, pt_prev, skb->dev);
+ pt_prev = ptype;
+ continue;
+ }
+
+ skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2)
break;
@@ -1574,9 +1590,11 @@ static void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
skb2->transport_header = skb2->network_header;
skb2->pkt_type = PACKET_OUTGOING;
- ptype->func(skb2, skb->dev, ptype, skb->dev);
+ pt_prev = ptype;
}
}
+ if (pt_prev)
+ pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
rcu_read_unlock();
}
@@ -2820,14 +2838,6 @@ static void net_tx_action(struct softirq_action *h)
}
}
-static inline int deliver_skb(struct sk_buff *skb,
- struct packet_type *pt_prev,
- struct net_device *orig_dev)
-{
- atomic_inc(&skb->users);
- return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
-}
-
#if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
(defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
/* This hook is defined here for ATM LANE */