sdla_x25.c

linux-2.6.15.6

}


/*===================================================================
 * Name:	new_if
 *
 * Purpose:	To allocate and initialize resources for a 
 *              new logical channel.  
 * 
 * Rationale:	A new channel can be added dynamically via
 *              ioctl call.
 *                
 * Description:	Allocate a private channel structure, x25_channel_t.
 *		Parse the user interface options from wanpipe#.conf 
 *		configuration file. 
 *		Bind the private are into the network device private
 *              area pointer (dev->priv).
 *		Prepare the network device structure for registration.
 *
 * Called by:	ROUTER_IFNEW Ioctl call, from wanrouter_ioctl() 
 *              (wanmain.c)
 *
 * Assumptions: None
 *
 * Warnings:	None
 *
 * Return: 	0 	Ok
 *		<0 	Failed (channel will not be created)
 */
static int new_if(struct wan_device* wandev, struct net_device* dev,
		  wanif_conf_t* conf)
{
	sdla_t* card = wandev->private;
	x25_channel_t* chan;
	int err = 0;

	if ((conf->name[0] == '\0') || (strlen(conf->name) > WAN_IFNAME_SZ)){
		printk(KERN_INFO "%s: invalid interface name!\n",
			card->devname);
		return -EINVAL;
	}

	if(card->wandev.new_if_cnt++ > 0 && card->u.x.LAPB_hdlc) {
		printk(KERN_INFO "%s: Error: Running LAPB HDLC Mode !\n",
						card->devname);
		printk(KERN_INFO 
			"%s: Maximum number of network interfaces must be one !\n",
						card->devname);
		return -EEXIST;
	}

	/* allocate and initialize private data */
	chan = kmalloc(sizeof(x25_channel_t), GFP_ATOMIC);
	if (chan == NULL){
		return -ENOMEM;
	}
	
	memset(chan, 0, sizeof(x25_channel_t));

	/* Bug Fix: Seg Err on PVC startup
	 * It must be here since bind_lcn_to_dev expects 
	 * it bellow */
	dev->priv = chan;
	
	strcpy(chan->name, conf->name);
	chan->card = card;
	chan->dev = dev;
	chan->common.sk = NULL;
	chan->common.func = NULL;
	chan->common.rw_bind = 0;
	chan->tx_skb = chan->rx_skb = NULL;

	/* verify media address */
	if (conf->addr[0] == '@'){		/* SVC */
		chan->common.svc = 1;
		strncpy(chan->addr, &conf->addr[1], WAN_ADDRESS_SZ);

		/* Set channel timeouts (default if not specified) */
		chan->idle_timeout = (conf->idle_timeout) ? 
					conf->idle_timeout : 90;
		chan->hold_timeout = (conf->hold_timeout) ? 
					conf->hold_timeout : 10;

	}else if (isdigit(conf->addr[0])){	/* PVC */
		int lcn = dec_to_uint(conf->addr, 0);

		if ((lcn >= card->u.x.lo_pvc) && (lcn <= card->u.x.hi_pvc)){
			bind_lcn_to_dev (card, dev, lcn);
		}else{
			printk(KERN_ERR
				"%s: PVC %u is out of range on interface %s!\n",
				wandev->name, lcn, chan->name);
			err = -EINVAL;
		}
	}else{
		printk(KERN_ERR
			"%s: invalid media address on interface %s!\n",
			wandev->name, chan->name);
		err = -EINVAL;
	}

	if(strcmp(conf->usedby, "WANPIPE") == 0){
                printk(KERN_INFO "%s: Running in WANPIPE mode %s\n",
			wandev->name, chan->name);
                chan->common.usedby = WANPIPE;
		chan->protocol = htons(ETH_P_IP);

        }else if(strcmp(conf->usedby, "API") == 0){
		chan->common.usedby = API;
                printk(KERN_INFO "%s: Running in API mode %s\n",
			wandev->name, chan->name);
		chan->protocol = htons(X25_PROT);
	}


	if (err){
		kfree(chan);
		dev->priv = NULL;
		return err;
	}
	
	chan->enable_IPX = conf->enable_IPX;
	
	if (chan->enable_IPX)
		chan->protocol = htons(ETH_P_IPX);
	
	if (conf->network_number)
		chan->network_number = conf->network_number;
	else
		chan->network_number = 0xDEADBEEF;

	/* prepare network device data space for registration */
	strcpy(dev->name,chan->name);

	dev->init = &if_init;

	init_x25_channel_struct(chan);

	return 0;
}

/*===================================================================
 * Name:	del_if(),  Remove a logical channel.	 
 *
 * Purpose:	To dynamically remove a logical channel.
 * 
 * Rationale:	Each logical channel should be dynamically
 *              removable. This functin is called by an 
 *              IOCTL_IFDEL ioctl call or shutdown(). 
 *                
 * Description: Do nothing.
 *
 * Called by:	IOCTL_IFDEL : wanrouter_ioctl() from wanmain.c
 *              shutdown() from sdlamain.c
 *
 * Assumptions: 
 *
 * Warnings:
 *
 * Return: 	0 Ok. Void function.
 */

//FIXME Del IF Should be taken out now.

static int del_if(struct wan_device* wandev, struct net_device* dev)
{
	return 0;
}


/*============================================================
 * Name:	wpx_exec
 *
 * Description:	Execute adapter interface command.
 * 		This option is currently dissabled.
 *===========================================================*/

static int wpx_exec (struct sdla* card, void* u_cmd, void* u_data)
{
        return 0;
}

/*============================================================
 * Name:	disable_comm	
 *
 * Description:	Disable communications during shutdown.
 *              Dont check return code because there is 
 *              nothing we can do about it.  
 *
 * Warning:	Dev and private areas are gone at this point.
 *===========================================================*/

static void disable_comm(sdla_t* card)
{
	disable_comm_shutdown(card);
	del_timer(&card->u.x.x25_timer);
	return;
}


/*============================================================
 *	Network Device Interface 
 *===========================================================*/

/*===================================================================
 * Name:	if_init(),   Netowrk Interface Initialization 	 
 *
 * Purpose:	To initialize a network interface device structure.
 * 
 * Rationale:	During network interface startup, the if_init
 *              is called by the kernel to initialize the
 *              netowrk device structure.  Thus a driver
 *              can customze a network device. 
 *                
 * Description:	Initialize the netowrk device call back
 *              routines.  This is where we tell the kernel
 *              which function to use when it wants to send
 *              via our interface. 
 *		Furthermore, we initialize the device flags, 
 *              MTU and physical address of the board.
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->init())
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok : Void function.
 */
static int if_init(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	struct wan_device* wandev = &card->wandev;

	/* Initialize device driver entry points */
	dev->open		= &if_open;
	dev->stop		= &if_close;
	dev->hard_header	= &if_header;
	dev->rebuild_header	= &if_rebuild_hdr;
	dev->hard_start_xmit	= &if_send;
	dev->get_stats		= &if_stats;
	dev->tx_timeout		= &if_tx_timeout;
	dev->watchdog_timeo	= TX_TIMEOUT;

	/* Initialize media-specific parameters */
	dev->type		= ARPHRD_PPP;		/* ARP h/w type */
	dev->flags		|= IFF_POINTOPOINT;
	dev->flags		|= IFF_NOARP;

	if (chan->common.usedby == API){
		dev->mtu	= X25_CHAN_MTU+sizeof(x25api_hdr_t);
	}else{
		dev->mtu	= card->wandev.mtu; 	
	}
	
	dev->hard_header_len	= X25_HRDHDR_SZ; /* media header length */
	dev->addr_len		= 2;		/* hardware address length */
	
	if (!chan->common.svc){
		*(unsigned short*)dev->dev_addr = htons(chan->common.lcn);
	}
	
	/* Initialize hardware parameters (just for reference) */
	dev->irq	= wandev->irq;
	dev->dma	= wandev->dma;
	dev->base_addr	= wandev->ioport;
	dev->mem_start	= (unsigned long)wandev->maddr;
	dev->mem_end	= wandev->maddr + wandev->msize - 1;

        /* Set transmit buffer queue length */
        dev->tx_queue_len = 100;
	SET_MODULE_OWNER(dev);

	/* FIXME Why are we doing this */
	set_chan_state(dev, WAN_DISCONNECTED);
	return 0;
}


/*===================================================================
 * Name:	if_open(),   Open/Bring up the Netowrk Interface 
 *
 * Purpose:	To bring up a network interface.
 * 
 * Rationale:	
 *                
 * Description:	Open network interface.
 * 		o prevent module from unloading by incrementing use count
 * 		o if link is disconnected then initiate connection
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->open())
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok
 * 		<0 	Failure: Interface will not come up.
 */

static int if_open(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	struct timeval tv;
	unsigned long smp_flags;
	
	if (netif_running(dev))
		return -EBUSY;

	chan->tq_working = 0;

	/* Initialize the workqueue */
	INIT_WORK(&chan->common.wanpipe_work, (void *)x25api_bh, dev);

	/* Allocate and initialize BH circular buffer */
	/* Add 1 to MAX_BH_BUFF so we don't have test with (MAX_BH_BUFF-1) */
	chan->bh_head = kmalloc((sizeof(bh_data_t)*(MAX_BH_BUFF+1)),GFP_ATOMIC);

	if (chan->bh_head == NULL){
		printk(KERN_INFO "%s: ERROR, failed to allocate memory ! BH_BUFFERS !\n",
				card->devname);

		return -ENOBUFS;
	}
	memset(chan->bh_head,0,(sizeof(bh_data_t)*(MAX_BH_BUFF+1)));
	atomic_set(&chan->bh_buff_used, 0);

	/* Increment the number of interfaces */
	++card->u.x.no_dev;
	
	wanpipe_open(card);

	/* LAPB protocol only uses one interface, thus
	 * start the protocol after it comes up. */
	if (card->u.x.LAPB_hdlc){
		if (card->open_cnt == 1){
			TX25Status* status = card->flags;
			S508_S514_lock(card, &smp_flags);
			x25_set_intr_mode(card, INTR_ON_TIMER); 
			status->imask &= ~INTR_ON_TIMER;
			S508_S514_unlock(card, &smp_flags);
		}
	}else{
		/* X25 can have multiple interfaces thus, start the 
		 * protocol once all interfaces are up */

		//FIXME: There is a bug here. If interface is
		//brought down and up, it will try to enable comm.
		if (card->open_cnt == card->u.x.num_of_ch){

			S508_S514_lock(card, &smp_flags);
			connect(card);
			S508_S514_unlock(card, &smp_flags);

			mod_timer(&card->u.x.x25_timer, jiffies + HZ);
		}
	}
	/* Device is not up until the we are in connected state */
	do_gettimeofday( &tv );
	chan->router_start_time = tv.tv_sec;

	netif_start_queue(dev);

	return 0;
}

/*===================================================================
 * Name:	if_close(),   Close/Bring down the Netowrk Interface 
 *
 * Purpose:	To bring down a network interface.
 * 
 * Rationale:	
 *                
 * Description:	Close network interface.
 * 		o decrement use module use count
 *
 * Called by:	Kernel (/usr/src/linux/net/core/dev.c)
 * 		(dev->close())
 *		ifconfig <name> down: will trigger the kernel
 *              which will call this function.
 *
 * Assumptions: None
 *	
 * Warnings:	None
 *
 * Return: 	0 	Ok
 * 		<0 	Failure: Interface will not exit properly.
 */
static int if_close(struct net_device* dev)
{
	x25_channel_t* chan = dev->priv;
	sdla_t* card = chan->card;
	unsigned long smp_flags;
	
	netif_stop_queue(dev);

	if ((chan->common.state == WAN_CONNECTED) || 
	    (chan->common.state == WAN_CONNECTING)){
		S508_S514_lock(card, &smp_flags);
		chan_disc(dev);
		S508_S514_unlock(card, &smp_flags);
	}

	wanpipe_close(card);

	S508_S514_lock(card, &smp_flags);
	if (chan->bh_head){
		int i;
		struct sk_buff *skb;
	
		for (i=0; i<(MAX_BH_BUFF+1); i++){
			skb = ((bh_data_t *)&chan->bh_head[i])->skb;
			if (skb != NULL){
                		dev_kfree_skb_any(skb);
			}
		}
		kfree(chan->bh_head);
		chan->bh_head=NULL;
	}
	S508_S514_unlock(card, &smp_flags);

	/* If this is the last close, disconnect physical link */
	if (!card->open_cnt){
		S508_S514_lock(card, &smp_flags);
		disconnect(card);
		x25_set_intr_mode(card, 0);
		S508_S514_unlock(card, &smp_flags);
	}
	
	/* Decrement the number of interfaces */
	--card->u.x.no_dev;
	return 0;
}