net_init.c

嵌入式系统的TCP/IP源代码

	 * We don't support HIPPI `ARP' for the time being, and probably
	 * never will unless someone else implements it. However we
	 * still need a fake ARPHRD to make ifconfig and friends play ball.
	 */
	dev->type		= ARPHRD_HIPPI;
	dev->hard_header_len 	= HIPPI_HLEN;
	dev->mtu		= 65280;
	dev->addr_len		= HIPPI_ALEN;
	dev->tx_queue_len	= 25 /* 5 */;
	memset(dev->broadcast, 0xFF, HIPPI_ALEN);


	/*
	 * HIPPI doesn't support broadcast+multicast and we only use
	 * static ARP tables. ARP is disabled by hippi_neigh_setup_dev. 
	 */
	dev->flags = 0; 

	dev_init_buffers(dev);
}
#endif

#if defined(CONFIG_ATALK) || defined(CONFIG_ATALK_MODULE)

static int ltalk_change_mtu(struct device *dev, int mtu)
{
	return -EINVAL;
}

static int ltalk_mac_addr(struct device *dev, void *addr)
{	
	return -EINVAL;
}


void ltalk_setup(struct device *dev)
{
	/* Fill in the fields of the device structure with localtalk-generic values. */
	
	dev->change_mtu		= ltalk_change_mtu;
	dev->hard_header	= NULL;
	dev->rebuild_header 	= NULL;
	dev->set_mac_address 	= ltalk_mac_addr;
	dev->hard_header_cache	= NULL;
	dev->header_cache_update= NULL;

	dev->type		= ARPHRD_LOCALTLK;
	dev->hard_header_len 	= LTALK_HLEN;
	dev->mtu		= LTALK_MTU;
	dev->addr_len		= LTALK_ALEN;
	dev->tx_queue_len	= 10;	
	
	dev->broadcast[0]	= 0xFF;

	dev->flags		= IFF_BROADCAST|IFF_MULTICAST|IFF_NOARP;

	dev_init_buffers(dev);
}

#endif

int ether_config(struct device *dev, struct ifmap *map)
{
	if (map->mem_start != (u_long)(-1))
		dev->mem_start = map->mem_start;
	if (map->mem_end != (u_long)(-1))
		dev->mem_end = map->mem_end;
	if (map->base_addr != (u_short)(-1))
		dev->base_addr = map->base_addr;
	if (map->irq != (u_char)(-1))
		dev->irq = map->irq;
	if (map->dma != (u_char)(-1))
		dev->dma = map->dma;
	if (map->port != (u_char)(-1))
		dev->if_port = map->port;
	return 0;
}

static int etherdev_get_index(struct device *dev)
{
	int i=MAX_ETH_CARDS;

	for (i = 0; i < MAX_ETH_CARDS; ++i)	{
		if (ethdev_index[i] == NULL) {
			sprintf(dev->name, "eth%d", i);
/*			printk("loading device '%s'...\n", dev->name);*/
			ethdev_index[i] = dev;
			return i;
		}
	}
	return -1;
}

static void etherdev_put_index(struct device *dev)
{
	int i;
	for (i = 0; i < MAX_ETH_CARDS; ++i) {
		if (ethdev_index[i] == dev) {
			ethdev_index[i] = NULL;
			break;
		}
	}
}

int register_netdev(struct device *dev)
{
	int i=-1;

	rtnl_lock();

	if (dev->name &&
	    (dev->name[0] == '\0' || dev->name[0] == ' '))
		i = etherdev_get_index(dev);

	if (register_netdevice(dev)) {
		if (i >= 0)
			etherdev_put_index(dev);
		rtnl_unlock();
		return -EIO;
	}
	rtnl_unlock();
	return 0;
}

void unregister_netdev(struct device *dev)
{
	rtnl_lock();
	unregister_netdevice(dev);
	etherdev_put_index(dev);
	rtnl_unlock();
}


#ifdef CONFIG_TR
/* The list of used and available "tr" slots */
#define MAX_TR_CARDS 16
static struct device *trdev_index[MAX_TR_CARDS];

struct device *init_trdev(struct device *dev, int sizeof_priv)
{
	int new_device = 0;
	int i;

	/* Use an existing correctly named device in Space.c:dev_base. */
	if (dev == NULL) {
		int alloc_size = sizeof(struct device) + sizeof("tr%d  ")
			+ sizeof_priv + 3;
		struct device *cur_dev;
		char pname[8];		/* Putative name for the device.  */

		for (i = 0; i < MAX_TR_CARDS; ++i)
			if (trdev_index[i] == NULL) {
				sprintf(pname, "tr%d", i);
				for (cur_dev = dev_base; cur_dev; cur_dev = cur_dev->next)
					if (strcmp(pname, cur_dev->name) == 0) {
						dev = cur_dev;
						dev->init = NULL;
						sizeof_priv = (sizeof_priv + 3) & ~3;
						dev->priv = sizeof_priv
							  ? kmalloc(sizeof_priv, GFP_KERNEL)
							  :	NULL;
						if (dev->priv) memset(dev->priv, 0, sizeof_priv);
						goto trfound;
					}
			}

		alloc_size &= ~3;		/* Round to dword boundary. */
		dev = (struct device *)kmalloc(alloc_size, GFP_KERNEL);
		if(dev==NULL)
			return NULL;
		memset(dev, 0, alloc_size);
		if (sizeof_priv)
			dev->priv = (void *) (dev + 1);
		dev->name = sizeof_priv + (char *)(dev + 1);
		new_device = 1;
	}

trfound:						/* From the double loop above. */

	for (i = 0; i < MAX_TR_CARDS; ++i)
		if (trdev_index[i] == NULL) {
			sprintf(dev->name, "tr%d", i);
			trdev_index[i] = dev;
			break;
		}


	dev->hard_header	 = tr_header;
	dev->rebuild_header  = tr_rebuild_header;

	dev->type		     = ARPHRD_IEEE802;
	dev->hard_header_len = TR_HLEN;
	dev->mtu		     = 2000; /* bug in fragmenter...*/
	dev->addr_len		 = TR_ALEN;
	dev->tx_queue_len	 = 100;	/* Long queues on tr */
	
	memset(dev->broadcast,0xFF, TR_ALEN);

	/* New-style flags. */
	dev->flags		= IFF_BROADCAST | IFF_MULTICAST ;

	if (new_device)
		register_netdevice(dev);

	return dev;
}

void tr_setup(struct device *dev)
{
	int i;

	/* register boot-defined "tr" devices */
	if (dev->name && (strncmp(dev->name, "tr", 2) == 0)) {
		i = simple_strtoul(dev->name + 2, NULL, 0);
		if (trdev_index[i] == NULL) {
			trdev_index[i] = dev;
		}
		else if (dev != trdev_index[i]) {
			/* Really shouldn't happen! */
			printk("tr_setup: Ouch! Someone else took %s\n",
				dev->name);
		}
	}
}

void tr_freedev(struct device *dev)
{
	int i;
	for (i = 0; i < MAX_TR_CARDS; ++i) 
	{
		if (trdev_index[i] == dev) 
		{
			trdev_index[i] = NULL;
			break;
		}
	}
}

int register_trdev(struct device *dev)
{
	dev_init_buffers(dev);
	
	if (dev->init && dev->init(dev) != 0) {
		unregister_trdev(dev);
		return -EIO;
	}
	return 0;
}

void unregister_trdev(struct device *dev)
{
	rtnl_lock();
	unregister_netdevice(dev);
	rtnl_unlock();
	tr_freedev(dev);
}
#endif


#ifdef CONFIG_NET_FC

#define MAX_FC_CARDS 2
static struct device *fcdev_index[MAX_FC_CARDS];
 
void fc_setup(struct device *dev)
{
int i;

        /* register boot-defined "fc" devices */
        if (dev->name && (strncmp(dev->name, "fc", 2) == 0)) {
                i = simple_strtoul(dev->name + 2, NULL, 0);
                if (fcdev_index[i] == NULL) {
                        fcdev_index[i] = dev;
                }
                else if (dev != fcdev_index[i]) {
                        /* Really shouldn't happen! */
                        printk("fc_setup: Ouch! Someone else took %s\n",
                                dev->name);
                }
        }
		
	dev->hard_header        =        fc_header;
        dev->rebuild_header  	=        fc_rebuild_header;
                
        dev->type               =        ARPHRD_IEEE802;
	dev->hard_header_len    =        FC_HLEN;
        dev->mtu                =        2024;
        dev->addr_len           =        FC_ALEN;
        dev->tx_queue_len       =        100; /* Long queues on fc */

        memset(dev->broadcast,0xFF, FC_ALEN);

        /* New-style flags. */
        dev->flags              =        IFF_BROADCAST;
		dev_init_buffers(dev);
        return;
}


struct device *init_fcdev(struct device *dev, int sizeof_priv)
{
int new_device = 0;
int i;
	/* Use an existing correctly named device in Space.c:dev_base. */
     if (dev == NULL) {
     int alloc_size = sizeof(struct device) + sizeof("fc%d  ") + sizeof_priv + 3; 
     struct device *cur_dev;
     char pname[8];          /* Putative name for the device.  */
                 
      	for (i = 0; i < MAX_FC_CARDS; ++i)
        	if (fcdev_index[i] == NULL) {
            	sprintf(pname, "fc%d", i);
                for (cur_dev = dev_base; cur_dev; cur_dev = cur_dev->next)
                	if (strcmp(pname, cur_dev->name) == 0) {
                        dev = cur_dev;
                        dev->init = NULL;
                        sizeof_priv = (sizeof_priv + 3) &~3;
                        dev->priv = sizeof_priv 
								? kmalloc(sizeof_priv, GFP_KERNEL)
                                : NULL;
                        if (dev->priv) memset(dev->priv, 0, sizeof_priv);
                        goto fcfound;
                     }
               }

        alloc_size &= ~3;               /* Round to dword boundary. */
        dev = (struct device *)kmalloc(alloc_size, GFP_KERNEL);
		memset(dev, 0, alloc_size);
        if (sizeof_priv)
        	dev->priv = (void *) (dev + 1);
        dev->name = sizeof_priv + (char *)(dev + 1);
        new_device = 1;
      }        

fcfound:                       /* From the double loop */
                                
        for (i = 0; i < MAX_FC_CARDS; ++i)
                if (fcdev_index[i] == NULL) {
                        sprintf(dev->name, "fc%d", i);
                        fcdev_index[i] = dev;
                        break;
                }
                                                
        fc_setup(dev);                                 
        if (new_device)                 
                register_netdevice(dev);  
                
        return dev;
}

void fc_freedev(struct device *dev)
{                                               
int i;
	for (i = 0; i < MAX_FC_CARDS; ++i) {
		if (fcdev_index[i] == dev) {
			fcdev_index[i] = NULL;
			break;
		}
	}
}


int register_fcdev(struct device *dev)
{
        dev_init_buffers(dev);
        if (dev->init && dev->init(dev) != 0) {
                unregister_fcdev(dev);
                return -EIO;
        }
        return 0;
}                                               
        
void unregister_fcdev(struct device *dev)
{
        rtnl_lock();
		unregister_netdevice(dev);
        rtnl_unlock();
        fc_freedev(dev);
}

#endif /* CONFIG_NET_FC */

/*
 * Local variables:
 *  compile-command: "gcc -D__KERNEL__ -I/usr/src/linux/net/inet -Wall -Wstrict-prototypes -O6 -m486 -c net_init.c"
 *  version-control: t
 *  kept-new-versions: 5
 * End:
 */