[VLAN]: Avoid a 4-order allocation.

This patch splits the vlan_group struct into a multi-allocated struct. On
x86_64, the size of the original struct is a little more than 32KB, causing
a 4-order allocation, which is prune to problems caused by buddy-system
external fragmentation conditions.

I couldn't just use vmalloc() because vfree() cannot be called in the
softirq context of the RCU callback.

Signed-off-by: Dan Aloni <da-x@monatomic.org>
Acked-by: Jeff Garzik <jeff@garzik.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Aloni
2007-03-02 20:44:51 -08:00
committed by David S. Miller
parent b5284e5aa9
commit 5c15bdec5c
22 changed files with 102 additions and 80 deletions

View File

@ -184,14 +184,23 @@ struct net_device *__find_vlan_dev(struct net_device *real_dev,
struct vlan_group *grp = __vlan_find_group(real_dev->ifindex);
if (grp)
return grp->vlan_devices[VID];
return vlan_group_get_device(grp, VID);
return NULL;
}
static void vlan_group_free(struct vlan_group *grp)
{
int i;
for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++)
kfree(grp->vlan_devices_arrays[i]);
kfree(grp);
}
static void vlan_rcu_free(struct rcu_head *rcu)
{
kfree(container_of(rcu, struct vlan_group, rcu));
vlan_group_free(container_of(rcu, struct vlan_group, rcu));
}
@ -223,7 +232,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
ret = 0;
if (grp) {
dev = grp->vlan_devices[vlan_id];
dev = vlan_group_get_device(grp, vlan_id);
if (dev) {
/* Remove proc entry */
vlan_proc_rem_dev(dev);
@ -237,7 +246,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
real_dev->vlan_rx_kill_vid(real_dev, vlan_id);
}
grp->vlan_devices[vlan_id] = NULL;
vlan_group_set_device(grp, vlan_id, NULL);
synchronize_net();
@ -251,7 +260,7 @@ static int unregister_vlan_dev(struct net_device *real_dev,
* group.
*/
for (i = 0; i < VLAN_VID_MASK; i++)
if (grp->vlan_devices[i])
if (vlan_group_get_device(grp, i))
break;
if (i == VLAN_VID_MASK) {
@ -379,6 +388,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
struct net_device *new_dev;
struct net_device *real_dev; /* the ethernet device */
char name[IFNAMSIZ];
int i;
#ifdef VLAN_DEBUG
printk(VLAN_DBG "%s: if_name -:%s:- vid: %i\n",
@ -544,6 +554,15 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
if (!grp)
goto out_free_unregister;
for (i=0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) {
grp->vlan_devices_arrays[i] = kzalloc(
sizeof(struct net_device *)*VLAN_GROUP_ARRAY_PART_LEN,
GFP_KERNEL);
if (!grp->vlan_devices_arrays[i])
goto out_free_arrays;
}
/* printk(KERN_ALERT "VLAN REGISTER: Allocated new group.\n"); */
grp->real_dev_ifindex = real_dev->ifindex;
@ -554,7 +573,7 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
real_dev->vlan_rx_register(real_dev, grp);
}
grp->vlan_devices[VLAN_ID] = new_dev;
vlan_group_set_device(grp, VLAN_ID, new_dev);
if (vlan_proc_add_dev(new_dev)<0)/* create it's proc entry */
printk(KERN_WARNING "VLAN: failed to add proc entry for %s\n",
@ -571,6 +590,9 @@ static struct net_device *register_vlan_device(const char *eth_IF_name,
#endif
return new_dev;
out_free_arrays:
vlan_group_free(grp);
out_free_unregister:
unregister_netdev(new_dev);
goto out_unlock;
@ -606,7 +628,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
case NETDEV_CHANGE:
/* Propagate real device state to vlan devices */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
@ -617,7 +639,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
case NETDEV_DOWN:
/* Put all VLANs for this dev in the down state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
@ -632,7 +654,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
case NETDEV_UP:
/* Put all VLANs for this dev in the up state too. */
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
vlandev = grp->vlan_devices[i];
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;
@ -649,7 +671,7 @@ static int vlan_device_event(struct notifier_block *unused, unsigned long event,
for (i = 0; i < VLAN_GROUP_ARRAY_LEN; i++) {
int ret;
vlandev = grp->vlan_devices[i];
vlandev = vlan_group_get_device(grp, i);
if (!vlandev)
continue;