net_init.c

linux和2410结合开发 用他可以生成2410所需的zImage文件

/* net_init.c: Initialization for network devices. */
/*
	Written 1993,1994,1995 by Donald Becker.

	The author may be reached as [e-mail], or C/O
	Scyld Computing Corporation
	410 Severn Ave., Suite 210
	Annapolis MD 21403

	This file contains the initialization for the "pl14+" style ethernet
	drivers.  It should eventually replace most of drivers/net/Space.c.
	It's primary advantage is that it's able to allocate low-memory buffers.
	A secondary advantage is that the dangerous NE*000 netcards can reserve
	their I/O port region before the SCSI probes start.

	Modifications/additions by Bjorn Ekwall <[e-mail]>:
		ethdev_index[MAX_ETH_CARDS]
		register_netdev() / unregister_netdev()
		
	Modifications by Wolfgang Walter
		Use dev_close cleanly so we always shut things down tidily.
		
	Changed 29/10/95, Alan Cox to pass sockaddr's around for mac addresses.
	
	14/06/96 - Paul Gortmaker:	Add generic eth_change_mtu() function. 
	24/09/96 - Paul Norton: Add token-ring variants of the netdev functions. 
	
	08/11/99 - Alan Cox: Got fed up of the mess in this file and cleaned it
			up. We now share common code and have regularised name
			allocation setups. Abolished the 16 card limits.
	03/19/2000 - jgarzik and Urban Widmark: init_etherdev 32-byte align
	03/21/2001 - jgarzik: alloc_etherdev and friends

*/

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/types.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/if_ether.h>
#include <linux/string.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/fddidevice.h>
#include <linux/hippidevice.h>
#include <linux/trdevice.h>
#include <linux/fcdevice.h>
#include <linux/if_arp.h>
#include <linux/if_ltalk.h>
#include <linux/rtnetlink.h>
#include <net/neighbour.h>

/* The network devices currently exist only in the socket namespace, so these
   entries are unused.  The only ones that make sense are
    open	start the ethercard
    close	stop  the ethercard
    ioctl	To get statistics, perhaps set the interface port (AUI, BNC, etc.)
   One can also imagine getting raw packets using
    read & write
   but this is probably better handled by a raw packet socket.

   Given that almost all of these functions are handled in the current
   socket-based scheme, putting ethercard devices in /dev/ seems pointless.
   
   [Removed all support for /dev network devices. When someone adds
    streams then by magic we get them, but otherwise they are un-needed
	and a space waste]
*/


static struct net_device *alloc_netdev(int sizeof_priv, const char *mask,
				       void (*setup)(struct net_device *))
{
	struct net_device *dev;
	int alloc_size;

	/* ensure 32-byte alignment of the private area */
	alloc_size = sizeof (*dev) + sizeof_priv + 31;

	dev = (struct net_device *) kmalloc (alloc_size, GFP_KERNEL);
	if (dev == NULL)
	{
		printk(KERN_ERR "alloc_dev: Unable to allocate device memory.\n");
		return NULL;
	}

	memset(dev, 0, alloc_size);

	if (sizeof_priv)
		dev->priv = (void *) (((long)(dev + 1) + 31) & ~31);

	setup(dev);
	strcpy(dev->name, mask);

	return dev;
}

static struct net_device *init_alloc_dev(int sizeof_priv)
{
	struct net_device *dev;
	int alloc_size;

	/* ensure 32-byte alignment of the private area */
	alloc_size = sizeof (*dev) + sizeof_priv + 31;

	dev = (struct net_device *) kmalloc (alloc_size, GFP_KERNEL);
	if (dev == NULL)
	{
		printk(KERN_ERR "alloc_dev: Unable to allocate device memory.\n");
		return NULL;
	}

	memset(dev, 0, alloc_size);

	if (sizeof_priv)
		dev->priv = (void *) (((long)(dev + 1) + 31) & ~31);

	return dev;
}

/* 
 *	Create and name a device from a prototype, then perform any needed
 *	setup.
 */

static struct net_device *init_netdev(struct net_device *dev, int sizeof_priv,
				      char *mask, void (*setup)(struct net_device *))
{
	int new_device = 0;

	/*
	 *	Allocate a device if one is not provided.
	 */
	 
	if (dev == NULL) {
		dev=init_alloc_dev(sizeof_priv);
		if(dev==NULL)
			return NULL;
		new_device = 1;
	}

	/*
	 *	Allocate a name
	 */
	 
	if (dev->name[0] == '\0' || dev->name[0] == ' ') {
		strcpy(dev->name, mask);
		if (dev_alloc_name(dev, mask)<0) {
			if (new_device)
				kfree(dev);
			return NULL;
		}
	}

	netdev_boot_setup_check(dev);
	
	/*
	 *	Configure via the caller provided setup function then
	 *	register if needed.
	 */
	
	setup(dev);
	
	if (new_device) {
		int err;

		rtnl_lock();
		err = register_netdevice(dev);
		rtnl_unlock();

		if (err < 0) {
			kfree(dev);
			dev = NULL;
		}
	}
	return dev;
}

#if defined(CONFIG_HIPPI) || defined(CONFIG_TR) || defined(CONFIG_NET_FC)
static int __register_netdev(struct net_device *dev)
{
	if (dev->init && dev->init(dev) != 0) {
		unregister_netdev(dev);
		return -EIO;
	}
	return 0;
}
#endif

/**
 * init_etherdev - Register ethernet device
 * @dev: An ethernet device structure to be filled in, or %NULL if a new
 *	struct should be allocated.
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this ethernet device
 *
 * Fill in the fields of the device structure with ethernet-generic values.
 *
 * If no device structure is passed, a new one is constructed, complete with
 * a private data area of size @sizeof_priv.  A 32-byte (not bit)
 * alignment is enforced for this private data area.
 *
 * If an empty string area is passed as dev->name, or a new structure is made,
 * a new name string is constructed.
 */

struct net_device *init_etherdev(struct net_device *dev, int sizeof_priv)
{
	return init_netdev(dev, sizeof_priv, "eth%d", ether_setup);
}

/**
 * alloc_etherdev - Allocates and sets up an ethernet device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this ethernet device
 *
 * Fill in the fields of the device structure with ethernet-generic
 * values. Basically does everything except registering the device.
 *
 * Constructs a new net device, complete with a private data area of
 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
 * this private data area.
 */

struct net_device *alloc_etherdev(int sizeof_priv)
{
	return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
}

EXPORT_SYMBOL(init_etherdev);
EXPORT_SYMBOL(alloc_etherdev);

static int eth_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr=p;
	if (netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, addr->sa_data,dev->addr_len);
	return 0;
}

static int eth_change_mtu(struct net_device *dev, int new_mtu)
{
	if ((new_mtu < 68) || (new_mtu > 1500))
		return -EINVAL;
	dev->mtu = new_mtu;
	return 0;
}

#ifdef CONFIG_FDDI

/**
 * init_fddidev - Register FDDI device
 * @dev: A FDDI device structure to be filled in, or %NULL if a new
 *	struct should be allocated.
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this ethernet device
 *
 * Fill in the fields of the device structure with FDDI-generic values.
 *
 * If no device structure is passed, a new one is constructed, complete with
 * a private data area of size @sizeof_priv.  A 32-byte (not bit)
 * alignment is enforced for this private data area.
 *
 * If an empty string area is passed as dev->name, or a new structure is made,
 * a new name string is constructed.
 */

struct net_device *init_fddidev(struct net_device *dev, int sizeof_priv)
{
	return init_netdev(dev, sizeof_priv, "fddi%d", fddi_setup);
}

/**
 * alloc_fddidev - Register FDDI device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this FDDI device
 *
 * Fill in the fields of the device structure with FDDI-generic values.
 *
 * Constructs a new net device, complete with a private data area of
 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
 * this private data area.
 */

struct net_device *alloc_fddidev(int sizeof_priv)
{
	return alloc_netdev(sizeof_priv, "fddi%d", fddi_setup);
}

EXPORT_SYMBOL(init_fddidev);
EXPORT_SYMBOL(alloc_fddidev);

static int fddi_change_mtu(struct net_device *dev, int new_mtu)
{
	if ((new_mtu < FDDI_K_SNAP_HLEN) || (new_mtu > FDDI_K_SNAP_DLEN))
		return(-EINVAL);
	dev->mtu = new_mtu;
	return(0);
}

#endif /* CONFIG_FDDI */

#ifdef CONFIG_HIPPI

static int hippi_change_mtu(struct net_device *dev, int new_mtu)
{
	/*
	 * HIPPI's got these nice large MTUs.
	 */
	if ((new_mtu < 68) || (new_mtu > 65280))
		return -EINVAL;
	dev->mtu = new_mtu;
	return(0);
}


/*
 * For HIPPI we will actually use the lower 4 bytes of the hardware
 * address as the I-FIELD rather than the actual hardware address.
 */
static int hippi_mac_addr(struct net_device *dev, void *p)
{
	struct sockaddr *addr = p;
	if (netif_running(dev))
		return -EBUSY;
	memcpy(dev->dev_addr, addr->sa_data, dev->addr_len);
	return 0;
}


/**
 * init_hippi_dev - Register HIPPI device
 * @dev: A HIPPI device structure to be filled in, or %NULL if a new
 *	struct should be allocated.
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this ethernet device
 *
 * Fill in the fields of the device structure with HIPPI-generic values.
 *
 * If no device structure is passed, a new one is constructed, complete with
 * a private data area of size @sizeof_priv.  A 32-byte (not bit)
 * alignment is enforced for this private data area.
 *
 * If an empty string area is passed as dev->name, or a new structure is made,
 * a new name string is constructed.
 */

struct net_device *init_hippi_dev(struct net_device *dev, int sizeof_priv)
{
	return init_netdev(dev, sizeof_priv, "hip%d", hippi_setup);
}

/**
 * alloc_hippi_dev - Register HIPPI device
 * @sizeof_priv: Size of additional driver-private structure to be allocated
 *	for this HIPPI device
 *
 * Fill in the fields of the device structure with HIPPI-generic values.
 *
 * Constructs a new net device, complete with a private data area of
 * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for
 * this private data area.
 */