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