JJJ：unregister_netdev

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已于 2024-04-09 23:34:45 修改 · 306 阅读

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#windows #microsoft #服务器

于 2024-04-09 00:34:15 首次发布

本文介绍了Linux内核中的两个关键函数unregister_netdev和unregister_netdevice_queue，用于从内核表中移除网络设备，包括关闭接口、移除队列、清理相关数据和协议栈的通知。文章还涉及设备状态管理、工作队列操作和数据包处理流程。

9362 /**
9363  *  unregister_netdev - remove device from the kernel
9364  *  @dev: device
9365  *
9366  *  This function shuts down a device interface and removes it
9367  *  from the kernel tables.
9368  *
9369  *  This is just a wrapper for unregister_netdevice that takes
9370  *  the rtnl semaphore.  In general you want to use this and not
9371  *  unregister_netdevice.
9372  */
9373 void unregister_netdev(struct net_device *dev)
9374 {
   
   
9375     rtnl_lock();
9376     unregister_netdevice(dev);
9377     rtnl_unlock();
9378 }
9379 EXPORT_SYMBOL(unregister_netdev);


2665 static inline void unregister_netdevice(struct net_device *dev)
2666 {
   
   
2667     unregister_netdevice_queue(dev, NULL);
2668 }




9315 /**
9316  *  unregister_netdevice_queue - remove device from the kernel
9317  *  @dev: device
9318  *  @head: list
9319  *
9320  *  This function shuts down a device interface and removes it
9321  *  from the kernel tables.
9322  *  If head not NULL, device is queued to be unregistered later.
9323  *
9324  *  Callers must hold the rtnl semaphore.  You may want
9325  *  unregister_netdev() instead of this.
9326  */
9327
9328 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
9329 {
   
   
9330     ASSERT_RTNL();
9331
9332     if (head) {
   
   
9333         list_move_tail(&dev->unreg_list, head);
9334     } else {
   
   
9335         rollback_registered(dev);
9336         /* Finish processing unregister after unlock */
9337         net_set_todo(dev);
9338     }
9339 }



8259 static void rollback_registered(struct net_device *dev)
8260 {
   
   
8261     LIST_HEAD(single);
8262
8263     list_add(&dev->unreg_list, &single);
8264     rollback_registered_many(&single);
8265     list_del(&single);
8266 }



8171 static void rollback_registered_many(struct list_head *head)
8172 {
   
   
8173     struct net_device *dev, *tmp;
8174     LIST_HEAD(close_head);
8175
8176     BUG_ON(dev_boot_phase);
8177     ASSERT_RTNL();
8178
8179     list_for_each_entry_safe(dev, tmp, head, unreg_list) {
   
   
8180         /* Some devices call without registering
8181          * for initialization unwind. Remove those
8182          * devices and proceed with the remaining.
8183          */
8184         if (dev->reg_state == NETREG_UNINITIALIZED) {
   
   
8185             pr_debug("unregister_netdevice: device %s/%p never was registered\n",
8186                  dev->name, dev);
8187
8188             WARN_ON(1);
8189             list_del(&dev->unreg_list);
8190             continue;
8191         }
8192         dev->dismantle = true;
8193         BUG_ON(dev->reg_state != NETREG_REGISTERED);
8194     }
8195
8196     /* If device is running, close it first. */
8197     list_for_each_entry(dev, head, unreg_list)
8198         list_add_tail(&dev->close_list, &close_head);
8199     dev_close_many(&close_head, true);
8200
8201     list_for_each_entry(dev, head, unreg_list) {
   
   
8202         /* And unlink it from device chain. */
8203         unlist_netdevice(dev);
8204
8205         dev->reg_state = NETREG_UNREGISTERING;
8206     }
8207     flush_all_backlogs();
8208
8209     synchronize_net();
8210
8211     list_for_each_entry(dev, head, unreg_list) {
   
   
8212         struct sk_buff *skb = NULL;
8213
8214         /* Shutdown queueing discipline. */
8215         dev_shutdown(dev);
8216
8217         dev_xdp_uninstall(dev);
8218
8219         /* Notify protocols, that we are about to destroy
8220          * this device. They should clean all the things.
8221          */
8222         call_netdevice_notifiers(NETDEV_UNREGISTER, dev<

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