sdla_fr.c

讲述linux的初始化过程

	u.cfg.kbps	= conf->bps / 1000;

    	u.cfg.cir_fwd = u.cfg.cir_bwd = 16;
        u.cfg.bc_fwd  = u.cfg.bc_bwd = 16;
	
	u.cfg.options	= 0x0000;
	printk(KERN_INFO "%s: Global CIR enabled by Default\n", card->devname);
	
	switch (conf->u.fr.signalling) {

		case WANOPT_FR_ANSI:
			u.cfg.options = 0x0000; 
			break;		
	
		case WANOPT_FR_Q933:	
			u.cfg.options |= 0x0200; 
			break;
	
		case WANOPT_FR_LMI:	
			u.cfg.options |= 0x0400; 
			break;

		case WANOPT_NO:
			u.cfg.options |= 0x0800; 
			break;
		default:
			printk(KERN_INFO "%s: Illegal Signalling option\n",
					card->wandev.name);
			return -EINVAL;
	}


	card->wandev.signalling = conf->u.fr.signalling;

	if (conf->station == WANOPT_CPE) {


		if (conf->u.fr.signalling == WANOPT_NO){
			printk(KERN_INFO 
				"%s: ERROR - For NO signalling, station must be set to Node!",
				 	 card->devname);
			return -EINVAL;
		}

		u.cfg.station = 0;
		u.cfg.options |= 0x8000;	/* auto config DLCI */
		card->u.f.dlci_num  = 0;
	
	} else {

		u.cfg.station = 1;	/* switch emulation mode */

		/* For switch emulation we have to create a list of dlci(s)
		 * that will be sent to be global SET_DLCI_CONFIGURATION 
		 * command in fr_configure() routine. 
		 */

		card->u.f.dlci_num  = min(max(conf->u.fr.dlci_num, 1), 100);
	
		for ( i = 0; i < card->u.f.dlci_num; i++) {

			card->u.f.node_dlci[i] = (unsigned short) 
				conf->u.fr.dlci[i] ? conf->u.fr.dlci[i] : 16;
	
		}
	}

	if (conf->clocking == WANOPT_INTERNAL)
		u.cfg.port |= 0x0001;

	if (conf->interface == WANOPT_RS232)
		u.cfg.port |= 0x0002;

	if (conf->u.fr.t391)
		u.cfg.t391 = min(conf->u.fr.t391, 30);
	else
		u.cfg.t391 = 5;

	if (conf->u.fr.t392)
		u.cfg.t392 = min(conf->u.fr.t392, 30);
	else
		u.cfg.t392 = 15;

	if (conf->u.fr.n391)
		u.cfg.n391 = min(conf->u.fr.n391, 255);
	else
		u.cfg.n391 = 2;

	if (conf->u.fr.n392)
		u.cfg.n392 = min(conf->u.fr.n392, 10);
	else
		u.cfg.n392 = 3;	

	if (conf->u.fr.n393)
		u.cfg.n393 = min(conf->u.fr.n393, 10);
	else
		u.cfg.n393 = 4;

	if (fr_configure(card, &u.cfg))
		return -EIO;

	if (card->hw.type == SDLA_S514) {
	
                buf_info = (void*)(card->hw.dpmbase + FR_MB_VECTOR +
			FR508_RXBC_OFFS);

                card->rxmb = (void*)(buf_info->rse_next + card->hw.dpmbase);

                card->u.f.rxmb_base =
                        (void*)(buf_info->rse_base + card->hw.dpmbase); 

                card->u.f.rxmb_last =
                        (void*)(buf_info->rse_base +
                        (buf_info->rse_num - 1) * sizeof(fr_rx_buf_ctl_t) +
                        card->hw.dpmbase);
	}

	else {	
		buf_info = (void*)(card->hw.dpmbase + FR508_RXBC_OFFS);

		card->rxmb = (void*)(buf_info->rse_next -
			FR_MB_VECTOR + card->hw.dpmbase);
		
		card->u.f.rxmb_base =
			(void*)(buf_info->rse_base -
			FR_MB_VECTOR + card->hw.dpmbase);
		
		card->u.f.rxmb_last =
			(void*)(buf_info->rse_base +
			(buf_info->rse_num - 1) * sizeof(fr_rx_buf_ctl_t) -
			FR_MB_VECTOR + card->hw.dpmbase);
	}

	card->u.f.rx_base = buf_info->buf_base;
	card->u.f.rx_top  = buf_info->buf_top;

	card->u.f.tx_interrupts_pending = 0;

	card->wandev.mtu	= conf->mtu;
	card->wandev.bps	= conf->bps;
	card->wandev.interface	= conf->interface;
	card->wandev.clocking	= conf->clocking;
	card->wandev.station	= conf->station;
	card->poll		= NULL; 
	card->exec		= &wpf_exec;
	card->wandev.update	= &update;
	card->wandev.new_if	= &new_if;
	card->wandev.del_if	= &del_if;
	card->wandev.state	= WAN_DISCONNECTED;
	card->wandev.ttl	= conf->ttl;
        card->wandev.udp_port 	= conf->udp_port;       

	/* Intialize global statistics for a card */
	init_global_statistics( card );

        card->TracingEnabled          = 0;

	/* Interrupt Test */
	Intr_test_counter = 0;
	card->intr_mode = INTR_TEST_MODE;
	err = intr_test( card );

	if (err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) {
		printk( 
			"%s: Interrupt Test Failed, Counter: %i\n", 
			card->devname, Intr_test_counter);
		printk( "Please choose another interrupt\n");
		err = -EIO;
		return err;
	}

	printk(KERN_INFO "%s: Interrupt Test Passed, Counter: %i\n",
			card->devname, Intr_test_counter);


        return 0;
}

/******* WAN Device Driver Entry Points *************************************/

/*============================================================================
 * Update device status & statistics.
 */
static int update (wan_device_t* wandev)
{
	volatile sdla_t* card;
	unsigned long timeout;
	fr508_flags_t* flags;

	/* sanity checks */
	if ((wandev == NULL) || (wandev->private == NULL))
		return -EFAULT;

	if (wandev->state == WAN_UNCONFIGURED)
		return -ENODEV;

	if (test_bit(1, (void*)&wandev->critical))
		return -EAGAIN;

	card = wandev->private;
	flags = card->flags;


	card->u.f.update_comms_stats = 1;
	card->u.f.timer_int_enabled |= TMR_INT_ENABLED_UPDATE;
	flags->imask |= FR_INTR_TIMER;
       	timeout = jiffies;
       	for(;;) {
		if(card->u.f.update_comms_stats == 0)
			break;
                if ((jiffies - timeout) > (1 * HZ)){
    			card->u.f.update_comms_stats = 0;
 			return -EAGAIN;
		}
        }
	return 0;
}

/*============================================================================
 * Create new logical channel.
 * This routine is called by the router when ROUTER_IFNEW IOCTL is being
 * handled.
 * o parse media- and hardware-specific configuration
 * o make sure that a new channel can be created
 * o allocate resources, if necessary
 * o prepare network device structure for registaration.
 *
 * Return:	0	o.k.
 *		< 0	failure (channel will not be created)
 */
static int new_if (wan_device_t* wandev, struct net_device* dev, wanif_conf_t* conf)
{
	sdla_t* card = wandev->private;
	fr_channel_t* chan;
	int dlci = 0;
	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;
	}

	/* allocate and initialize private data */
	chan = kmalloc(sizeof(fr_channel_t), GFP_KERNEL);

	if (chan == NULL)
		return -ENOMEM;

	memset(chan, 0, sizeof(fr_channel_t));
	strcpy(chan->name, conf->name);
	chan->card = card;
 
	/* verify media address */
	if (is_digit(conf->addr[0])) {

		dlci = dec_to_uint(conf->addr, 0);

		if (dlci && (dlci <= HIGHEST_VALID_DLCI)) {
		
			chan->dlci = dlci;
		
		} else {
		
			printk(KERN_ERR
				"%s: invalid DLCI %u on interface %s!\n",
				wandev->name, dlci, chan->name);
			err = -EINVAL;
		}

	} else {
		printk(KERN_ERR
			"%s: invalid media address on interface %s!\n",
			wandev->name, chan->name);
		err = -EINVAL;
	}

        /* Setup wanpipe as a router (WANPIPE) or as an API */
        if(strcmp(conf->usedby, "WANPIPE") == 0){
                printk(KERN_INFO "%s: Running in WANPIPE mode %s\n",
			wandev->name, chan->name);
                chan->usedby = WANPIPE;

        } else if(strcmp(conf->usedby, "API") == 0){

#ifdef FRAME_RELAY_API
                chan->usedby = API;
                printk(KERN_INFO "%s: Running in API mode %s\n",
			wandev->name, chan->name);
#else
                printk(KERN_INFO "%s: API Mode is not supported !\n",
			wandev->name);
                printk(KERN_INFO
			"%s: API patch can be obtained from Sangoma Tech.\n",
                        	wandev->name);
                err = -EINVAL;
#endif
        }

	if (err) {
		
		kfree(chan);
		return err;
	}

	card->u.f.dlci_to_dev_map[dlci] = dev;
 
	/* place cir,be,bc and other channel specific information into the
	 * chan structure 
         */
	if (conf->cir) {

		chan->cir = max( 1, min( conf->cir, 512 ) );
		chan->cir_status = CIR_ENABLED; 

		
		/* If CIR is enabled, force BC to equal CIR
                 * this solves number of potential problems if CIR is 
                 * set and BC is not 
		 */
		chan->bc = chan->cir;

		if (conf->be){
			chan->be = max( 0, min( conf->be, 511) ); 
		}else{	
			conf->be = 0;
		}

		printk (KERN_INFO "%s: CIR enabled for DLCI %i \n",
				wandev->name,chan->dlci);
		printk (KERN_INFO "%s:     CIR = %i ; BC = %i ; BE = %i\n",
				wandev->name,chan->cir,chan->bc,chan->be);


	}else{
		chan->cir_status = CIR_DISABLED;
		printk (KERN_INFO "%s: CIR disabled for DLCI %i\n",
				wandev->name,chan->dlci);
	}

	chan->mc = conf->mc;

	/* FIXME: ARP is not supported by this frame relay verson */
	if (conf->inarp == WANOPT_YES){
		printk(KERN_INFO "%s: ERROR - This version of WANPIPE doesn't support ARPs\n",
				card->devname);
	
		//chan->inarp = conf->inarp ? INARP_REQUEST : INARP_NONE;
		//chan->inarp_interval = conf->inarp_interval ? conf->inarp_interval : 10;
		kfree(chan);
		return -EINVAL;
	}else{
		chan->inarp = INARP_NONE;
		chan->inarp_interval = 10;
	}

	chan->dlci_configured = DLCI_NOT_CONFIGURED;	


	/*FIXME: IPX disabled in this WANPIPE version */
	if (conf->enable_IPX == WANOPT_YES){
		printk(KERN_INFO "%s: ERROR - This version of WANPIPE doesn't support IPX\n",
				card->devname);
		kfree(chan);
		return -EINVAL;
	}else{
		chan->enable_IPX = WANOPT_NO;
	}	

	if (conf->network_number){
		chan->network_number = conf->network_number;
	}else{
		chan->network_number = 0xDEADBEEF;
	}

	chan->route_flag = NO_ROUTE;
	
	init_chan_statistics(chan);

	chan->transmit_length = 0;

	/* prepare network device data space for registration */
	strcpy(dev->name, chan->name);
	dev->init = &if_init;
	dev->priv = chan;


	/* Enable Interrupts and Communications */
	if (!wandev->new_if_cnt){
		fr508_flags_t* flags = card->flags;

		wandev->new_if_cnt++;

		/* 
		If you enable comms and then set ints, you get a Tx int as you
		perform the SET_INT_TRIGGERS command. So, we only set int
		triggers and then adjust the interrupt mask (to disable Tx ints)
		before enabling comms. 
		*/	
                if (fr_set_intr_mode(card, (FR_INTR_RXRDY | FR_INTR_TXRDY |
			FR_INTR_DLC | FR_INTR_TIMER | FR_INTR_TX_MULT_DLCIs) ,
			card->wandev.mtu, 0)) {
			kfree(chan);
			return -EIO;
		}

		flags->imask &= ~(FR_INTR_TXRDY | FR_INTR_TIMER);
 
		if (fr_comm_enable(card)) {
			kfree(chan);
			return -EIO;
		}	
		wanpipe_set_state(card, WAN_CONNECTED);
	}

	return 0;
}

/*============================================================================
 * Delete logical channel.
 */
static int del_if (wan_device_t* wandev, struct net_device* dev)
{
	sdla_t *card = wandev->private;

	/* Execute shutdown very first time we enter del_if */

	if (!wandev->del_if_cnt) {
		wandev->del_if_cnt++;
		wanpipe_set_state(card, WAN_DISCONNECTED);
		fr_set_intr_mode(card, 0, 0, 0);
		fr_comm_disable(card);