net_device指针，用于预置net_device成员的值。
linux-2.6.22/net/core/dev.c
----------------------------------------
struct net_device *alloc_netdev(int sizeof_priv, const char *name,
void (*setup)(struct net_device *))
{
void *p;
struct net_device *dev;
int alloc_size;
BUG_ON(strlen(name) >= sizeof(dev->name));
/* ensure 32-byte alignment of both the device and private area */
alloc_size = (sizeof(*dev) + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST;
alloc_size += sizeof_priv + NETDEV_ALIGN_CONST;
p = kzalloc(alloc_size, GFP_KERNEL);
if (!p) {
printk(KERN_ERR "alloc_netdev: Unable to allocate device.\n");
return NULL;
}
dev = (struct net_device *)
(((long)p + NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
dev->padded = (char *)dev - (char *)p;
if (sizeof_priv)
dev->priv = netdev_priv(dev);
dev->get_stats = internal_stats;
setup(dev);
strcpy(dev->name, name);
return dev;
}
alloc_etherdev()是alloc_netdev()针对以太网的"快捷"函数
linux-2.6.22/net/ethernet/eth.c
----------------------------------------
struct net_device *alloc_etherdev(int sizeof_priv)
{
----returnalloc_netdev(sizeof_priv, "eth%d",ether_setup);
}
net_device
+--------------+
| |
|--------------|
| base_addr |
|--------------|
| |
| |
|--------------|
| priv |---+
|--------------| |
| | |
| | |
+--------------+<--+
| |
| | sizeof_priv
| |
+--------------+