哪种是注册新net_device的正确方法? [英] Which is the correct way to register a new net_device?

问题描述

我正在尝试在linux中注册新的net_device ...我可以分配并正确注册它，而ifconfig显示它.当我尝试设置界面时，问题就来了:

i'm trying to register a new net_device in linux...i can alloc and register it correctly and ifconfig shows it. The problem arrives when i try to put the interface up:

ifconfig my_dev up

发生内核冻结...问题仅存在于x86机器上，我无法弄清原因...在pcc机器上一切正常.代码很简单:

A kernel freeze occurs...the problem is present only on x86 machines and i can't figure out the reason...on a pcc machine all works well. The code is very simple:

static struct net_device *my_dev;

static int veth_dev_init(struct net_device *dev);
static int veth_open(struct net_device *dev);
static int veth_close(struct net_device *dev);
static int veth_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd);

static struct veth_priv
{
   ...
};

static struct net_device_ops veth_ops =
{
  .ndo_init = veth_dev_init,
  .ndo_open = veth_open,
  .ndo_stop = veth_close,
  .ndo_do_ioctl = veth_ioctl
};

static int __init veth_init()
{
  my_dev = alloc_netdev(sizeof(struct veth_priv), "my_dev", ether_setup);
  if (my_dev == NULL)
    return -ENOMEM;

  my_dev->netdev_ops = &veth_ops;

  register_netdev(my_dev);
  return 0;
}

static void __exit veth_exit()
{
  unregister_netdev(my_dev);
  free_netdev(my_dev);
}

module_init(veth_init);
module_exit(veth_exit);

前四个函数veth_dev_init, veth_open, veth_close和veth_ioctl仅返回0. 也许veth_ops结构中缺少字段?

The first four functions veth_dev_init, veth_open, veth_close and veth_ioctl simply return 0. Maybe is there a missing field in veth_ops structure?

谢谢大家！

推荐答案

是的，您错过了 struct net_device_ops 中的一个元素
还要添加 .ndo_start_xmit ，并且该函数必须返回NETDEV_TX_OK或NETDEV_TX_BUSY.

Yea, you missed one element in struct net_device_ops
Add .ndo_start_xmit also, And the function must return NETDEV_TX_OK or NETDEV_TX_BUSY.

用法如下

static netdev_tx_t veth_xmit(struct sk_buff *skb, struct net_device *dev)
{
    return NETDEV_TX_OK;
}

并将打开更改为

static int veth_open(struct net_device *dev)
{
     memcpy(dev->dev_addr, "\0ABCD0", ETH_ALEN);
     netif_start_queue(dev);
     return 0;
}

然后在 veth_ops

static struct net_device_ops veth_ops = {
     .ndo_init         = veth_dev_init,
     .ndo_open         = veth_open,
     .ndo_stop         = veth_close,
     .ndo_start_xmit   = veth_xmit,
     .ndo_do_ioctl     = veth_ioctl,
};

然后在插入模块后

给出ifconfig my_dev 192.168.10.98 ...

give ifconfig my_dev 192.168.10.98 ...

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