diff options
| author | Changli Gao <xiaosuo@gmail.com> | 2010-12-15 19:57:25 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-12-19 21:50:20 -0800 |
| commit | 71d9dec24dce548bf699815c976cf063ad9257e2 (patch) | |
| tree | aad41859f011a20125acb3a717b3fc3121f108a2 /net | |
| parent | 1a75972c61f2c224eb5283c183f9f6b17fb09b6b (diff) | |
| download | lwn-71d9dec24dce548bf699815c976cf063ad9257e2.tar.gz lwn-71d9dec24dce548bf699815c976cf063ad9257e2.zip | |
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')
| -rw-r--r-- | net/core/dev.c | 30 |
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 */ |