Linux内核——遍历 net_device 结构

linux内核版本 ： 2.6.32<=（这个更早的也许就已经这样了，具体是从哪个版本开始的，我没有考证，需要在今后，发现后及时补充。）

extern struct net *init_net;	/* 存放net_device的全局变量 */
extern rwlock_t                         dev_base_lock;          /* Device list lock */

/*这些是我们遍历 net_device 结构的循环 */

#define for_each_netdev(net, d)         \
                list_for_each_entry(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_reverse(net, d) \
                list_for_each_entry_reverse(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_rcu(net, d)             \
                list_for_each_entry_rcu(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_safe(net, d, n) \
                list_for_each_entry_safe(d, n, &(net)->dev_base_head, dev_list)
#define for_each_netdev_continue(net, d)                \
                list_for_each_entry_continue(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_continue_rcu(net, d)            \
        list_for_each_entry_continue_rcu(d, &(net)->dev_base_head, dev_list)
#define for_each_netdev_in_bond_rcu(bond, slave)        \
                for_each_netdev_rcu(&init_net, slave)   \
                         if (netdev_master_upper_dev_get_rcu(slave) == bond)
#define net_device_entry(lh)    list_entry(lh, struct net_device, dev_list)

《深入理解Linux网络技术内幕》中介绍的是这样子的：

480 extern struct net_device                *dev_base;              /* All devices */
481 extern rwlock_t                         dev_base_lock;          /* Device list lock */

遍历方式：

struct net_device * dev = dev_base;
while(dev) {
	dev = dev->next;
}