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bridge: Avoid unnecessary clone on forward path

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When the packet is delivered to the local bridge device we may
end up cloning it unnecessarily if no bridge port can receive
the packet in br_flood.

This patch avoids this by moving the skb_clone into br_flood.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2010-02-27 19:41:41 +00:00 committed by David S. Miller
parent 68b7c895be
commit b33084be19
3 changed files with 26 additions and 17 deletions
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35
net/bridge/br_forward.c
View File

@ -105,8 +105,9 @@ void br_forward(const struct net_bridge_port *to, struct sk_buff *skb)
/* called under bridge lock */
static void br_flood(struct net_bridge *br, struct sk_buff *skb,
void (*__packet_hook)(const struct net_bridge_port *p,
struct sk_buff *skb))
struct sk_buff *skb0,
void (*__packet_hook)(const struct net_bridge_port *p,
struct sk_buff *skb))
{
struct net_bridge_port *p;
struct net_bridge_port *prev;
@ -120,8 +121,7 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
if ((skb2 = skb_clone(skb, GFP_ATOMIC)) == NULL) {
br->dev->stats.tx_dropped++;
kfree_skb(skb);
return;
goto out;
}
__packet_hook(prev, skb2);
@ -131,23 +131,34 @@ static void br_flood(struct net_bridge *br, struct sk_buff *skb,
}
}
if (prev != NULL) {
__packet_hook(prev, skb);
return;
}
if (!prev)
goto out;
kfree_skb(skb);
if (skb0) {
skb = skb_clone(skb, GFP_ATOMIC);
if (!skb) {
br->dev->stats.tx_dropped++;
goto out;
}
}
__packet_hook(prev, skb);
return;
out:
if (!skb0)
kfree_skb(skb);
}
/* called with rcu_read_lock */
void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb)
{
br_flood(br, skb, __br_deliver);
br_flood(br, skb, NULL, __br_deliver);
}
/* called under bridge lock */
void br_flood_forward(struct net_bridge *br, struct sk_buff *skb)
void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb2)
{
br_flood(br, skb, __br_forward);
br_flood(br, skb, skb2, __br_forward);
}

5
net/bridge/br_input.c
View File

@ -72,14 +72,11 @@ int br_handle_frame_finish(struct sk_buff *skb)
skb = NULL;
}
if (skb2 == skb)
skb2 = skb_clone(skb, GFP_ATOMIC);
if (skb) {
if (dst)
br_forward(dst->dst, skb);
else
br_flood_forward(br, skb);
br_flood_forward(br, skb, skb2);
}
if (skb2)

3
net/bridge/br_private.h
View File

@ -180,7 +180,8 @@ extern void br_forward(const struct net_bridge_port *to,
struct sk_buff *skb);
extern int br_forward_finish(struct sk_buff *skb);
extern void br_flood_deliver(struct net_bridge *br, struct sk_buff *skb);
extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb);
extern void br_flood_forward(struct net_bridge *br, struct sk_buff *skb,
struct sk_buff *skb2);
/* br_if.c */
extern void br_port_carrier_check(struct net_bridge_port *p);