redonkable/remarkable-linux
redonkable/remarkable-linux
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[BRIDGE]: forwarding remove unneeded preempt and bh diasables

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Optimize the forwarding and transmit paths. Both places are
called with bottom half/no preempt so there is no need to use
spin_lock_bh or rcu_read_lock.

Signed-off-by: Stephen Hemminger <shemminger@osdl.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2006-03-20 22:58:36 -08:00 committed by David S. Miller
parent fdeabdefb2
commit f8ae737dee
2 changed files with 3 additions and 6 deletions
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3
net/bridge/br_device.c
View file

@ -27,6 +27,7 @@ static struct net_device_stats *br_dev_get_stats(struct net_device *dev)
return &br->statistics; return &br->statistics;
} }
/* net device transmit always called with no BH (preempt_disabled) */
int br_dev_xmit(struct sk_buff *skb, struct net_device *dev) int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{ {
struct net_bridge *br = netdev_priv(dev); struct net_bridge *br = netdev_priv(dev);
@ -39,7 +40,6 @@ int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
skb->mac.raw = skb->data; skb->mac.raw = skb->data;
skb_pull(skb, ETH_HLEN); skb_pull(skb, ETH_HLEN);
rcu_read_lock();
if (dest[0] & 1) if (dest[0] & 1)
br_flood_deliver(br, skb, 0); br_flood_deliver(br, skb, 0);
else if ((dst = __br_fdb_get(br, dest)) != NULL) else if ((dst = __br_fdb_get(br, dest)) != NULL)
@ -47,7 +47,6 @@ int br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
else else
br_flood_deliver(br, skb, 0); br_flood_deliver(br, skb, 0);
rcu_read_unlock();
return 0; return 0;
} }

6
net/bridge/br_fdb.c
View file

@ -341,7 +341,6 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
if (hold_time(br) == 0) if (hold_time(br) == 0)
return; return;
rcu_read_lock();
fdb = fdb_find(head, addr); fdb = fdb_find(head, addr);
if (likely(fdb)) { if (likely(fdb)) {
/* attempt to update an entry for a local interface */ /* attempt to update an entry for a local interface */
@ -356,13 +355,12 @@ void br_fdb_update(struct net_bridge *br, struct net_bridge_port *source,
fdb->ageing_timer = jiffies; fdb->ageing_timer = jiffies;
} }
} else { } else {
spin_lock_bh(&br->hash_lock); spin_lock(&br->hash_lock);
if (!fdb_find(head, addr)) if (!fdb_find(head, addr))
fdb_create(head, source, addr, 0); fdb_create(head, source, addr, 0);
/* else we lose race and someone else inserts /* else we lose race and someone else inserts
* it first, don't bother updating * it first, don't bother updating
*/ */
spin_unlock_bh(&br->hash_lock); spin_unlock(&br->hash_lock);
} }
rcu_read_unlock();
} }