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macvlan: remove one synchronize_rcu() call

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When one macvlan device is dismantled, we can avoid one
synchronize_rcu() call done after deletion from hash list, since caller
will perform a synchronize_net() call after its ndo_stop() call.

Add a new netdev->dismantle field to signal this dismantle intent.

Reduces RTNL hold time.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Patrick McHardy <kaber@trash.net>
CC: Ben Greear <greearb@candelatech.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2011-05-19 12:24:16 +00:00
committed by David S. Miller
parent 034cfe48d0
commit 449f454426
3 changed files with 9 additions and 6 deletions
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9
drivers/net/macvlan.c
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@@ -70,16 +70,17 @@ static void macvlan_hash_add(struct macvlan_dev *vlan)
hlist_add_head_rcu(&vlan->hlist, &port->vlan_hash[addr[5]]);
}
static void macvlan_hash_del(struct macvlan_dev *vlan)
static void macvlan_hash_del(struct macvlan_dev *vlan, bool sync)
{
hlist_del_rcu(&vlan->hlist);
synchronize_rcu();
if (sync)
synchronize_rcu();
}
static void macvlan_hash_change_addr(struct macvlan_dev *vlan,
const unsigned char *addr)
{
macvlan_hash_del(vlan);
macvlan_hash_del(vlan, true);
/* Now that we are unhashed it is safe to change the device
* address without confusing packet delivery.
*/
@@ -345,7 +346,7 @@ static int macvlan_stop(struct net_device *dev)
dev_uc_del(lowerdev, dev->dev_addr);
hash_del:
macvlan_hash_del(vlan);
macvlan_hash_del(vlan, !dev->dismantle);
return 0;
}