[RTNETLINK]: rtnl_link API simplification
All drivers need to unregister their devices in the module unload function. While doing so they must hold the rtnl and atomically unregister the rtnl_link ops as well. This makes the rtnl_link_unregister function that takes the rtnl itself completely useless. Provide default newlink/dellink functions, make __rtnl_link_unregister and rtnl_link_unregister unregister all devices with matching rtnl_link_ops and change the existing users to take advantage of that. Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
David S. Miller
Родитель
8c979c26a0
Коммит
2d85cba2b2
|
|
@ -37,11 +37,6 @@
|
|||
#include <linux/rtnetlink.h>
|
||||
#include <net/rtnetlink.h>
|
||||
|
||||
struct dummy_priv {
|
||||
struct net_device *dev;
|
||||
struct list_head list;
|
||||
};
|
||||
|
||||
static int numdummies = 1;
|
||||
|
||||
static int dummy_xmit(struct sk_buff *skb, struct net_device *dev);
|
||||
|
|
@ -89,37 +84,9 @@ static int dummy_xmit(struct sk_buff *skb, struct net_device *dev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static LIST_HEAD(dummies);
|
||||
|
||||
static int dummy_newlink(struct net_device *dev,
|
||||
struct nlattr *tb[], struct nlattr *data[])
|
||||
{
|
||||
struct dummy_priv *priv = netdev_priv(dev);
|
||||
int err;
|
||||
|
||||
err = register_netdevice(dev);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
priv->dev = dev;
|
||||
list_add_tail(&priv->list, &dummies);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void dummy_dellink(struct net_device *dev)
|
||||
{
|
||||
struct dummy_priv *priv = netdev_priv(dev);
|
||||
|
||||
list_del(&priv->list);
|
||||
unregister_netdevice(dev);
|
||||
}
|
||||
|
||||
static struct rtnl_link_ops dummy_link_ops __read_mostly = {
|
||||
.kind = "dummy",
|
||||
.priv_size = sizeof(struct dummy_priv),
|
||||
.setup = dummy_setup,
|
||||
.newlink = dummy_newlink,
|
||||
.dellink = dummy_dellink,
|
||||
};
|
||||
|
||||
/* Number of dummy devices to be set up by this module. */
|
||||
|
|
@ -129,12 +96,9 @@ MODULE_PARM_DESC(numdummies, "Number of dummy pseudo devices");
|
|||
static int __init dummy_init_one(void)
|
||||
{
|
||||
struct net_device *dev_dummy;
|
||||
struct dummy_priv *priv;
|
||||
int err;
|
||||
|
||||
dev_dummy = alloc_netdev(sizeof(struct dummy_priv), "dummy%d",
|
||||
dummy_setup);
|
||||
|
||||
dev_dummy = alloc_netdev(0, "dummy%d", dummy_setup);
|
||||
if (!dev_dummy)
|
||||
return -ENOMEM;
|
||||
|
||||
|
|
@ -146,10 +110,6 @@ static int __init dummy_init_one(void)
|
|||
err = register_netdevice(dev_dummy);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
|
||||
priv = netdev_priv(dev_dummy);
|
||||
priv->dev = dev_dummy;
|
||||
list_add_tail(&priv->list, &dummies);
|
||||
return 0;
|
||||
|
||||
err:
|
||||
|
|
@ -159,7 +119,6 @@ err:
|
|||
|
||||
static int __init dummy_init_module(void)
|
||||
{
|
||||
struct dummy_priv *priv, *next;
|
||||
int i, err = 0;
|
||||
|
||||
rtnl_lock();
|
||||
|
|
@ -167,11 +126,8 @@ static int __init dummy_init_module(void)
|
|||
|
||||
for (i = 0; i < numdummies && !err; i++)
|
||||
err = dummy_init_one();
|
||||
if (err < 0) {
|
||||
list_for_each_entry_safe(priv, next, &dummies, list)
|
||||
dummy_dellink(priv->dev);
|
||||
if (err < 0)
|
||||
__rtnl_link_unregister(&dummy_link_ops);
|
||||
}
|
||||
rtnl_unlock();
|
||||
|
||||
return err;
|
||||
|
|
@ -179,14 +135,7 @@ static int __init dummy_init_module(void)
|
|||
|
||||
static void __exit dummy_cleanup_module(void)
|
||||
{
|
||||
struct dummy_priv *priv, *next;
|
||||
|
||||
rtnl_lock();
|
||||
list_for_each_entry_safe(priv, next, &dummies, list)
|
||||
dummy_dellink(priv->dev);
|
||||
|
||||
__rtnl_link_unregister(&dummy_link_ops);
|
||||
rtnl_unlock();
|
||||
rtnl_link_unregister(&dummy_link_ops);
|
||||
}
|
||||
|
||||
module_init(dummy_init_module);
|
||||
|
|
|
|||
|
|
@ -33,15 +33,12 @@
|
|||
#include <linux/etherdevice.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/moduleparam.h>
|
||||
#include <linux/list.h>
|
||||
#include <net/pkt_sched.h>
|
||||
|
||||
#define TX_TIMEOUT (2*HZ)
|
||||
|
||||
#define TX_Q_LIMIT 32
|
||||
struct ifb_private {
|
||||
struct list_head list;
|
||||
struct net_device *dev;
|
||||
struct net_device_stats stats;
|
||||
struct tasklet_struct ifb_tasklet;
|
||||
int tasklet_pending;
|
||||
|
|
@ -201,12 +198,6 @@ static struct net_device_stats *ifb_get_stats(struct net_device *dev)
|
|||
return stats;
|
||||
}
|
||||
|
||||
static LIST_HEAD(ifbs);
|
||||
|
||||
/* Number of ifb devices to be set up by this module. */
|
||||
module_param(numifbs, int, 0);
|
||||
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
|
||||
|
||||
static int ifb_close(struct net_device *dev)
|
||||
{
|
||||
struct ifb_private *dp = netdev_priv(dev);
|
||||
|
|
@ -230,41 +221,19 @@ static int ifb_open(struct net_device *dev)
|
|||
return 0;
|
||||
}
|
||||
|
||||
static int ifb_newlink(struct net_device *dev,
|
||||
struct nlattr *tb[], struct nlattr *data[])
|
||||
{
|
||||
struct ifb_private *priv = netdev_priv(dev);
|
||||
int err;
|
||||
|
||||
err = register_netdevice(dev);
|
||||
if (err < 0)
|
||||
return err;
|
||||
|
||||
priv->dev = dev;
|
||||
list_add_tail(&priv->list, &ifbs);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void ifb_dellink(struct net_device *dev)
|
||||
{
|
||||
struct ifb_private *priv = netdev_priv(dev);
|
||||
|
||||
list_del(&priv->list);
|
||||
unregister_netdevice(dev);
|
||||
}
|
||||
|
||||
static struct rtnl_link_ops ifb_link_ops __read_mostly = {
|
||||
.kind = "ifb",
|
||||
.priv_size = sizeof(struct ifb_private),
|
||||
.setup = ifb_setup,
|
||||
.newlink = ifb_newlink,
|
||||
.dellink = ifb_dellink,
|
||||
};
|
||||
|
||||
/* Number of ifb devices to be set up by this module. */
|
||||
module_param(numifbs, int, 0);
|
||||
MODULE_PARM_DESC(numifbs, "Number of ifb devices");
|
||||
|
||||
static int __init ifb_init_one(int index)
|
||||
{
|
||||
struct net_device *dev_ifb;
|
||||
struct ifb_private *priv;
|
||||
int err;
|
||||
|
||||
dev_ifb = alloc_netdev(sizeof(struct ifb_private),
|
||||
|
|
@ -281,10 +250,6 @@ static int __init ifb_init_one(int index)
|
|||
err = register_netdevice(dev_ifb);
|
||||
if (err < 0)
|
||||
goto err;
|
||||
|
||||
priv = netdev_priv(dev_ifb);
|
||||
priv->dev = dev_ifb;
|
||||
list_add_tail(&priv->list, &ifbs);
|
||||
return 0;
|
||||
|
||||
err:
|
||||
|
|
@ -294,7 +259,6 @@ err:
|
|||
|
||||
static int __init ifb_init_module(void)
|
||||
{
|
||||
struct ifb_private *priv, *next;
|
||||
int i, err;
|
||||
|
||||
rtnl_lock();
|
||||
|
|
@ -302,11 +266,8 @@ static int __init ifb_init_module(void)
|
|||
|
||||
for (i = 0; i < numifbs && !err; i++)
|
||||
err = ifb_init_one(i);
|
||||
if (err) {
|
||||
list_for_each_entry_safe(priv, next, &ifbs, list)
|
||||
ifb_dellink(priv->dev);
|
||||
if (err)
|
||||
__rtnl_link_unregister(&ifb_link_ops);
|
||||
}
|
||||
rtnl_unlock();
|
||||
|
||||
return err;
|
||||
|
|
@ -314,14 +275,7 @@ static int __init ifb_init_module(void)
|
|||
|
||||
static void __exit ifb_cleanup_module(void)
|
||||
{
|
||||
struct ifb_private *priv, *next;
|
||||
|
||||
rtnl_lock();
|
||||
list_for_each_entry_safe(priv, next, &ifbs, list)
|
||||
ifb_dellink(priv->dev);
|
||||
|
||||
__rtnl_link_unregister(&ifb_link_ops);
|
||||
rtnl_unlock();
|
||||
rtnl_link_unregister(&ifb_link_ops);
|
||||
}
|
||||
|
||||
module_init(ifb_init_module);
|
||||
|
|
|
|||
|
|
@ -115,26 +115,6 @@ err1:
|
|||
return err;
|
||||
}
|
||||
|
||||
/* Cleanup all vlan devices
|
||||
* Note: devices that have been registered that but not
|
||||
* brought up will exist but have no module ref count.
|
||||
*/
|
||||
static void __exit vlan_cleanup_devices(void)
|
||||
{
|
||||
struct net_device *dev, *nxt;
|
||||
|
||||
rtnl_lock();
|
||||
for_each_netdev_safe(dev, nxt) {
|
||||
if (dev->priv_flags & IFF_802_1Q_VLAN) {
|
||||
unregister_vlan_dev(VLAN_DEV_INFO(dev)->real_dev,
|
||||
VLAN_DEV_INFO(dev)->vlan_id);
|
||||
|
||||
unregister_netdevice(dev);
|
||||
}
|
||||
}
|
||||
rtnl_unlock();
|
||||
}
|
||||
|
||||
/*
|
||||
* Module 'remove' entry point.
|
||||
* o delete /proc/net/router directory and static entries.
|
||||
|
|
@ -150,7 +130,6 @@ static void __exit vlan_cleanup_module(void)
|
|||
unregister_netdevice_notifier(&vlan_notifier_block);
|
||||
|
||||
dev_remove_pack(&vlan_packet_type);
|
||||
vlan_cleanup_devices();
|
||||
|
||||
/* This table must be empty if there are no module
|
||||
* references left.
|
||||
|
|
|
|||
|
|
@ -270,6 +270,9 @@ static LIST_HEAD(link_ops);
|
|||
*/
|
||||
int __rtnl_link_register(struct rtnl_link_ops *ops)
|
||||
{
|
||||
if (!ops->dellink)
|
||||
ops->dellink = unregister_netdevice;
|
||||
|
||||
list_add_tail(&ops->list, &link_ops);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -298,12 +301,16 @@ EXPORT_SYMBOL_GPL(rtnl_link_register);
|
|||
* __rtnl_link_unregister - Unregister rtnl_link_ops from rtnetlink.
|
||||
* @ops: struct rtnl_link_ops * to unregister
|
||||
*
|
||||
* The caller must hold the rtnl_mutex. This function should be used
|
||||
* by drivers that unregister devices during module unloading. It must
|
||||
* be called after unregistering the devices.
|
||||
* The caller must hold the rtnl_mutex.
|
||||
*/
|
||||
void __rtnl_link_unregister(struct rtnl_link_ops *ops)
|
||||
{
|
||||
struct net_device *dev, *n;
|
||||
|
||||
for_each_netdev_safe(dev, n) {
|
||||
if (dev->rtnl_link_ops == ops)
|
||||
ops->dellink(dev);
|
||||
}
|
||||
list_del(&ops->list);
|
||||
}
|
||||
|
||||
|
|
@ -1067,7 +1074,10 @@ replay:
|
|||
if (tb[IFLA_LINKMODE])
|
||||
dev->link_mode = nla_get_u8(tb[IFLA_LINKMODE]);
|
||||
|
||||
err = ops->newlink(dev, tb, data);
|
||||
if (ops->newlink)
|
||||
err = ops->newlink(dev, tb, data);
|
||||
else
|
||||
err = register_netdevice(dev);
|
||||
err_free:
|
||||
if (err < 0)
|
||||
free_netdev(dev);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче