patch-2.2.14 linux/drivers/net/sdla_chdlc.c

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diff -u --recursive --new-file v2.2.13/linux/drivers/net/sdla_chdlc.c linux/drivers/net/sdla_chdlc.c
@@ -0,0 +1,2785 @@
+/*****************************************************************************
+* sdla_chdlc.c	WANPIPE(tm) Multiprotocol WAN Link Driver. Cisco HDLC module.
+*
+* Authors: 	Nenad Corbic <ncorbic@sangoma.com>
+*		Gideon Hack  
+*
+* Copyright:	(c) 1995-1999 Sangoma Technologies Inc.
+*
+*		This program is free software; you can redistribute it and/or
+*		modify it under the terms of the GNU General Public License
+*		as published by the Free Software Foundation; either version
+*		2 of the License, or (at your option) any later version.
+* ============================================================================
+* Nov 20, 1999  Nenad Corbic 	Fixed zero length API bug.
+* Sep 30, 1999  Nenad Corbic    Fixed dynamic IP and route setup.
+* Sep 23, 1999  Nenad Corbic    Added SMP support, fixed tracing 
+* Sep 13, 1999  Nenad Corbic	Split up Port 0 and 1 into separate devices.
+* Jun 02, 1999  Gideon Hack     Added support for the S514 adapter.
+* Oct 30, 1998	Jaspreet Singh	Added Support for CHDLC API (HDLC STREAMING).
+* Oct 28, 1998	Jaspreet Singh	Added Support for Dual Port CHDLC.
+* Aug 07, 1998	David Fong	Initial version.
+*****************************************************************************/
+
+#include <linux/version.h>
+#include <linux/kernel.h>	/* printk(), and other useful stuff */
+#include <linux/stddef.h>	/* offsetof(), etc. */
+#include <linux/errno.h>	/* return codes */
+#include <linux/string.h>	/* inline memset(), etc. */
+#include <linux/malloc.h>	/* kmalloc(), kfree() */
+#include <linux/wanrouter.h>	/* WAN router definitions */
+#include <linux/wanpipe.h>	/* WANPIPE common user API definitions */
+#include <linux/if_arp.h>	/* ARPHRD_* defines */
+#include <linux/inetdevice.h>
+#include <asm/uaccess.h>
+#include <linux/in.h>		/* sockaddr_in */
+#include <linux/inet.h>	
+#include <linux/if.h>
+#include <asm/byteorder.h>	/* htons(), etc. */
+#include <linux/sdlapci.h>
+#include <asm/io.h>
+
+#include <linux/sdla_chdlc.h>		/* CHDLC firmware API definitions */
+
+/****** Defines & Macros ****************************************************/
+
+#ifdef	_DEBUG_
+#define	STATIC
+#else
+#define	STATIC		static
+#endif
+
+/* reasons for enabling the timer interrupt on the adapter */
+#define TMR_INT_ENABLED_UDP   	0x0001
+#define TMR_INT_ENABLED_UPDATE	0x0002
+ 
+#define	CHDLC_DFLT_DATA_LEN	1500		/* default MTU */
+#define CHDLC_HDR_LEN		1
+
+#define IFF_POINTTOPOINT 0x10
+
+#define WANPIPE 0x00
+#define API	0x01
+#define CHDLC_API 0x01
+
+#define PORT(x)   (x == 0 ? "PRIMARY" : "SECONDARY" )
+
+ 
+/******Data Structures*****************************************************/
+
+/* This structure is placed in the private data area of the device structure.
+ * The card structure used to occupy the private area but now the following 
+ * structure will incorporate the card structure along with CHDLC specific data
+ */
+
+typedef struct chdlc_private_area
+{
+	sdla_t		*card;
+	int 		TracingEnabled;		/* For enabling Tracing */
+	unsigned long 	curr_trace_addr;	/* Used for Tracing */
+	unsigned long 	start_trace_addr;
+	unsigned long 	end_trace_addr;
+	unsigned long 	base_addr_trace_buffer;
+	unsigned long 	end_addr_trace_buffer;
+	unsigned short 	number_trace_elements;
+	unsigned  	available_buffer_space;
+	unsigned long 	router_start_time;
+	unsigned char 	route_status;
+	unsigned char 	route_removed;
+	unsigned long 	tick_counter;		/* For 5s timeout counter */
+	unsigned long 	router_up_time;
+        u32             IP_address;		/* IP addressing */
+        u32             IP_netmask;
+	unsigned char  mc;			/* Mulitcast support on/off */
+	unsigned short udp_pkt_lgth;		/* udp packet processing */
+	char udp_pkt_src;
+	char udp_pkt_data[MAX_LGTH_UDP_MGNT_PKT];
+	unsigned short timer_int_enabled;
+	char update_comms_stats;		/* updating comms stats */
+	//FIXME: add driver stats as per frame relay!
+
+} chdlc_private_area_t;
+
+/* Route Status options */
+#define NO_ROUTE	0x00
+#define ADD_ROUTE	0x01
+#define ROUTE_ADDED	0x02
+#define REMOVE_ROUTE	0x03
+
+
+/* variable for keeping track of enabling/disabling FT1 monitor status */
+static int rCount = 0;
+
+/* variable for tracking how many interfaces to open for WANPIPE on the
+   two ports */
+
+extern void disable_irq(unsigned int);
+extern void enable_irq(unsigned int);
+
+/****** Function Prototypes *************************************************/
+/* WAN link driver entry points. These are called by the WAN router module. */
+static int update (wan_device_t* wandev);
+static int new_if (wan_device_t* wandev, struct device* dev,
+	wanif_conf_t* conf);
+static int del_if (wan_device_t* wandev, struct device* dev);
+
+/* Network device interface */
+static int if_init   (struct device* dev);
+static int if_open   (struct device* dev);
+static int if_close  (struct device* dev);
+static int if_header (struct sk_buff* skb, struct device* dev,
+	unsigned short type, void* daddr, void* saddr, unsigned len);
+#ifdef LINUX_2_1
+static int if_rebuild_hdr (struct sk_buff *skb);
+#else
+static int if_rebuild_hdr (void* hdr, struct device* dev, unsigned long raddr,
+        struct sk_buff* skb);
+#endif
+static int if_send (struct sk_buff* skb, struct device* dev);
+static struct enet_statistics* if_stats (struct device* dev);
+
+/* CHDLC Firmware interface functions */
+static int chdlc_configure 	(sdla_t* card, void* data);
+static int chdlc_comm_enable 	(sdla_t* card);
+static int chdlc_comm_disable 	(sdla_t* card);
+static int chdlc_read_version 	(sdla_t* card, char* str);
+static int chdlc_set_intr_mode 	(sdla_t* card, unsigned mode);
+static int chdlc_send (sdla_t* card, void* data, unsigned len);
+static int chdlc_read_comm_err_stats (sdla_t* card);
+static int chdlc_read_op_stats (sdla_t* card);
+
+
+/* Miscellaneous CHDLC Functions */
+static int set_chdlc_config (sdla_t* card);
+static void init_chdlc_tx_rx_buff( sdla_t* card, struct device *dev );
+static int chdlc_error (sdla_t *card, int err, CHDLC_MAILBOX_STRUCT *mb);
+static int process_chdlc_exception(sdla_t *card);
+static int process_global_exception(sdla_t *card);
+static int update_comms_stats(sdla_t* card,
+        chdlc_private_area_t* chdlc_priv_area);
+static int configure_ip (sdla_t* card);
+static int unconfigure_ip (sdla_t* card);
+static void process_route(sdla_t *card);
+static void port_set_state (sdla_t *card, int);
+
+
+/* Interrupt handlers */
+static void wpc_isr (sdla_t* card);
+static void rx_intr (sdla_t* card);
+static void timer_intr(sdla_t *);
+
+/* Miscellaneous functions */
+static int chk_bcast_mcast_addr(sdla_t* card, struct device* dev,
+				struct sk_buff *skb);
+static int reply_udp( unsigned char *data, unsigned int mbox_len );
+static int intr_test( sdla_t* card, struct device *dev );
+static int udp_pkt_type( struct sk_buff *skb , sdla_t* card);
+static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
+                                struct sk_buff *skb, struct device* dev,
+                                chdlc_private_area_t* chdlc_priv_area);
+static int process_udp_mgmt_pkt(sdla_t* card, struct device* dev,  
+				chdlc_private_area_t* chdlc_priv_area);
+static unsigned short calc_checksum (char *, int);
+static void s508_lock (sdla_t *card, unsigned long *smp_flags);
+static void s508_unlock (sdla_t *card, unsigned long *smp_flags);
+
+
+static int  Intr_test_counter;
+/****** Public Functions ****************************************************/
+
+/*============================================================================
+ * Cisco HDLC protocol initialization routine.
+ *
+ * This routine is called by the main WANPIPE module during setup.  At this
+ * point adapter is completely initialized and firmware is running.
+ *  o read firmware version (to make sure it's alive)
+ *  o configure adapter
+ *  o initialize protocol-specific fields of the adapter data space.
+ *
+ * Return:	0	o.k.
+ *		< 0	failure.
+ */
+int wpc_init (sdla_t* card, wandev_conf_t* conf)
+{
+	unsigned char port_num;
+	int err;
+	unsigned long max_permitted_baud = 0;
+
+	union
+		{
+		char str[80];
+		} u;
+	volatile CHDLC_MAILBOX_STRUCT* mb;
+	CHDLC_MAILBOX_STRUCT* mb1;
+	unsigned long timeout;
+
+	/* Verify configuration ID */
+	if (conf->config_id != WANCONFIG_CHDLC) {
+		printk(KERN_INFO "%s: invalid configuration ID %u!\n",
+				  card->devname, conf->config_id);
+		return -EINVAL;
+	}
+
+	/* Find out which Port to use */
+	if ((conf->comm_port == WANOPT_PRI) || (conf->comm_port == WANOPT_SEC)){
+		if (card->next){
+
+			if (conf->comm_port != card->next->u.c.comm_port){
+				card->u.c.comm_port = conf->comm_port;
+			}else{
+				printk(KERN_ERR "%s: ERROR - %s port used!\n",
+        		        	card->wandev.name, PORT(conf->comm_port));
+				return -EINVAL;
+			}
+		}else{
+			card->u.c.comm_port = conf->comm_port;
+		}
+	}else{
+		printk(KERN_ERR "%s: ERROR - Invalid Port Selected!\n",
+                			card->wandev.name);
+		return -EINVAL;
+	}
+	
+
+	/* Initialize protocol-specific fields */
+	if(card->hw.type != SDLA_S514){
+
+		if (card->u.c.comm_port == WANOPT_PRI){	
+			card->mbox  = (void *) card->hw.dpmbase;
+		}else{
+			card->mbox  = (void *) card->hw.dpmbase + 
+				SEC_BASE_ADDR_MB_STRUCT - PRI_BASE_ADDR_MB_STRUCT;
+		}	
+	}else{ 
+		/* for a S514 adapter, set a pointer to the actual mailbox in the */
+		/* allocated virtual memory area */
+		if (card->u.c.comm_port == WANOPT_PRI){
+			card->mbox = (void *) card->hw.dpmbase + PRI_BASE_ADDR_MB_STRUCT;
+		}else{
+			card->mbox = (void *) card->hw.dpmbase + SEC_BASE_ADDR_MB_STRUCT;
+		}	
+	}
+
+	mb = mb1 = card->mbox;
+
+	if (!card->configured){
+
+		/* The board will place an 'I' in the return code to indicate that it is
+	   	ready to accept commands.  We expect this to be completed in less
+           	than 1 second. */
+
+		timeout = jiffies;
+		while (mb->return_code != 'I')	/* Wait 1s for board to initialize */
+			if ((jiffies - timeout) > 1*HZ) break;
+
+		if (mb->return_code != 'I') {
+			printk(KERN_INFO
+				"%s: Initialization not completed by adapter\n",
+				card->devname);
+			printk(KERN_INFO "Please contact Sangoma representative.\n");
+			return -EIO;
+		}
+	}
+
+	/* Read firmware version.  Note that when adapter initializes, it
+	 * clears the mailbox, so it may appear that the first command was
+	 * executed successfully when in fact it was merely erased. To work
+	 * around this, we execute the first command twice.
+	 */
+
+	if (chdlc_read_version(card, u.str))
+		return -EIO;
+
+	printk(KERN_INFO "%s: Running Cisco HDLC firmware v%s\n",
+		card->devname, u.str); 
+
+	card->isr			= &wpc_isr;
+	card->poll			= NULL;
+	card->exec			= NULL;
+	card->wandev.update		= &update;
+ 	card->wandev.new_if		= &new_if;
+	card->wandev.del_if		= &del_if;
+	card->wandev.state		= WAN_DUALPORT;
+	card->wandev.udp_port   	= conf->udp_port;
+
+	card->wandev.new_if_cnt = 0;
+
+	/* This is for the ports link state */
+	card->u.c.state = WAN_DISCONNECTED;
+	
+	/* reset the number of times the 'update()' proc has been called */
+	card->u.c.update_call_count = 0;
+	
+	card->wandev.ttl = conf->ttl;
+	card->wandev.interface = conf->interface; 
+
+	if ((card->u.c.comm_port == WANOPT_SEC && conf->interface == WANOPT_V35)&&
+	    card->hw.type != SDLA_S514){
+		printk(KERN_INFO "%s: ERROR - V35 Interface not supported on S508 %s port \n",
+			card->devname, PORT(card->u.c.comm_port));
+		return -EIO;
+	}
+
+	card->wandev.clocking = conf->clocking;
+
+	port_num = card->u.c.comm_port;
+
+	/* Setup Port Bps */
+
+	if(card->wandev.clocking) {
+                      
+		if(port_num == WANOPT_PRI) {
+			/* For Primary Port 0 */
+               		max_permitted_baud =
+				(card->hw.type == SDLA_S514) ?
+				PRI_MAX_BAUD_RATE_S514 : 
+				PRI_MAX_BAUD_RATE_S508;
+		}
+		else if(port_num == WANOPT_SEC) {
+			/* For Secondary Port 1 */
+                        max_permitted_baud =
+                               (card->hw.type == SDLA_S514) ?
+                                SEC_MAX_BAUD_RATE_S514 :
+                                SEC_MAX_BAUD_RATE_S508;
+                        }
+  
+			if(conf->bps > max_permitted_baud) {
+				conf->bps = max_permitted_baud;
+				printk(KERN_INFO "%s: Baud too high!\n",
+					card->wandev.name);
+ 				printk(KERN_INFO "%s: Baud rate set to %lu bps\n", 
+					card->wandev.name, max_permitted_baud);
+			}
+                             
+			card->wandev.bps = conf->bps;
+	}else{
+        	card->wandev.bps = 0;
+  	}
+
+	/* Setup the Port MTU */
+	if(port_num == WANOPT_PRI) {
+		/* For Primary Port 0 */
+		card->wandev.mtu =
+			(conf->mtu >= MIN_LGTH_CHDLC_DATA_CFG) ?
+			min(conf->mtu, PRI_MAX_NO_DATA_BYTES_IN_FRAME) :
+			CHDLC_DFLT_DATA_LEN;
+	} else if(port_num == WANOPT_SEC) { 
+		/* For Secondary Port 1 */
+		card->wandev.mtu =
+			(conf->mtu >= MIN_LGTH_CHDLC_DATA_CFG) ?
+			min(conf->mtu, SEC_MAX_NO_DATA_BYTES_IN_FRAME) :
+			CHDLC_DFLT_DATA_LEN;
+	}
+
+	/* Set up the interrupt status area */
+	/* Read the CHDLC Configuration and obtain: 
+	 *	Ptr to shared memory infor struct
+         * Use this pointer to calculate the value of card->u.c.flags !
+ 	 */
+	mb1->buffer_length = 0;
+	mb1->command = READ_CHDLC_CONFIGURATION;
+	err = sdla_exec(mb1) ? mb1->return_code : CMD_TIMEOUT;
+	if(err != COMMAND_OK) {
+		clear_bit(1, (void*)&card->wandev.critical);
+
+                if(card->hw.type != SDLA_S514)
+                	enable_irq(card->hw.irq);
+
+		chdlc_error(card, err, mb1);
+		return -EIO;
+	}
+
+	if(card->hw.type == SDLA_S514){
+               	card->u.c.flags = (void *)(card->hw.dpmbase +
+               		(((CHDLC_CONFIGURATION_STRUCT *)mb1->data)->
+			ptr_shared_mem_info_struct));
+        }else{
+                card->u.c.flags = (void *)(card->hw.dpmbase +
+                        (((CHDLC_CONFIGURATION_STRUCT *)mb1->data)->
+			ptr_shared_mem_info_struct % SDLA_WINDOWSIZE));
+	}
+
+	return 0;
+}
+
+/******* WAN Device Driver Entry Points *************************************/
+
+/*============================================================================
+ * Update device status & statistics
+ * This procedure is called when updating the PROC file system and returns
+ * various communications statistics. These statistics are accumulated from 3 
+ * different locations:
+ * 	1) The 'if_stats' recorded for the device.
+ * 	2) Communication error statistics on the adapter.
+ *      3) CHDLC operational statistics on the adapter.
+ * The board level statistics are read during a timer interrupt. Note that we 
+ * read the error and operational statistics during consecitive timer ticks so
+ * as to minimize the time that we are inside the interrupt handler.
+ *
+ */
+static int update (wan_device_t* wandev)
+{
+	sdla_t* card = wandev->private;
+ 	struct device* dev = card->wandev.dev;
+        volatile chdlc_private_area_t* chdlc_priv_area = dev->priv;
+        SHARED_MEMORY_INFO_STRUCT *flags;
+	unsigned long timeout;
+
+	/* sanity checks */
+	if((wandev == NULL) || (wandev->private == NULL))
+		return -EFAULT;
+	
+	if(wandev->state == WAN_UNCONFIGURED)
+		return -ENODEV;
+
+	/* more sanity checks */
+        if(!card->u.c.flags)
+                return -ENODEV;
+	if(test_bit(1, (void*)&card->wandev.critical))
+                return -EAGAIN;
+
+	if(!dev->start)
+		return -ENODEV;
+
+      	flags = card->u.c.flags;
+       	if(chdlc_priv_area->update_comms_stats){
+		return -EAGAIN;
+	}
+			
+	/* we will need 2 timer interrupts to complete the */
+	/* reading of the statistics */
+	chdlc_priv_area->update_comms_stats = 2;
+       	flags->interrupt_info_struct.interrupt_permission |= APP_INT_ON_TIMER;
+	chdlc_priv_area->timer_int_enabled = TMR_INT_ENABLED_UPDATE;
+  
+	/* wait a maximum of 1 second for the statistics to be updated */ 
+        timeout = jiffies;
+        for(;;) {
+		if(chdlc_priv_area->update_comms_stats == 0)
+			break;
+                if ((jiffies - timeout) > (1 * HZ)){
+    			chdlc_priv_area->update_comms_stats = 0;
+ 			chdlc_priv_area->timer_int_enabled &=
+				~TMR_INT_ENABLED_UPDATE; 
+ 			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 device* dev, wanif_conf_t* conf)
+{
+	sdla_t* card = wandev->private;
+	chdlc_private_area_t* chdlc_priv_area;
+
+	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 */
+	chdlc_priv_area = kmalloc(sizeof(chdlc_private_area_t), GFP_KERNEL);
+	
+	if(chdlc_priv_area == NULL) 
+		return -ENOMEM;
+
+	memset(chdlc_priv_area, 0, sizeof(chdlc_private_area_t));
+	
+	chdlc_priv_area->card = card; 
+	
+	/* initialize data */
+	strcpy(card->u.c.if_name, conf->name);
+
+	if(card->wandev.new_if_cnt > 0) {
+                kfree(chdlc_priv_area);
+		return -EEXIST;
+	}
+
+	card->wandev.new_if_cnt++;
+
+	chdlc_priv_area->TracingEnabled = 0;
+	chdlc_priv_area->route_status = NO_ROUTE;
+	chdlc_priv_area->route_removed = 0;
+
+	/* Setup protocol options */
+
+	card->u.c.protocol_options = 0;
+
+	if (conf->ignore_dcd == WANOPT_YES){
+		card->u.c.protocol_options |= IGNORE_DCD_FOR_LINK_STAT;
+	}
+
+	if (conf->ignore_cts == WANOPT_YES){
+		card->u.c.protocol_options |= IGNORE_CTS_FOR_LINK_STAT;
+	}
+
+	if (conf->ignore_keepalive == WANOPT_YES) {
+		card->u.c.protocol_options |= IGNORE_KPALV_FOR_LINK_STAT;
+		card->u.c.kpalv_tx  = MIN_Tx_KPALV_TIMER; 
+		card->u.c.kpalv_rx  = MIN_Rx_KPALV_TIMER; 
+		card->u.c.kpalv_err = MIN_KPALV_ERR_TOL; 
+
+	} else {   /* Do not ignore keepalives */
+
+		card->u.c.kpalv_tx =
+  	   		(conf->keepalive_tx_tmr - MIN_Tx_KPALV_TIMER) >= 0 ?
+	   		min (conf->keepalive_tx_tmr, MAX_Tx_KPALV_TIMER) :
+	   					DEFAULT_Tx_KPALV_TIMER;
+
+		card->u.c.kpalv_rx =
+	   		(conf->keepalive_rx_tmr - MIN_Rx_KPALV_TIMER) >= 0 ?
+	   		min (conf->keepalive_rx_tmr, MAX_Rx_KPALV_TIMER) :
+	   					DEFAULT_Rx_KPALV_TIMER;
+
+		card->u.c.kpalv_err =
+	   		(conf->keepalive_err_margin - MIN_KPALV_ERR_TOL) >= 0 ?
+	   		min (conf->keepalive_err_margin, MAX_KPALV_ERR_TOL) : 
+	   					DEFAULT_KPALV_ERR_TOL;
+	}
+
+
+	/* Setup slarp timer to control delay between slarps 
+         */ 
+	card->u.c.slarp_timer = 
+		(conf->slarp_timer - MIN_SLARP_REQ_TIMER) >=0 ?
+		min (conf->slarp_timer, MAX_SLARP_REQ_TIMER) :
+					DEFAULT_SLARP_REQ_TIMER;
+
+
+	/* If HDLC_STRAMING is enabled then IGNORE DCD, CTS and KEEPALIVES
+         * are automatically ignored 
+	 */
+	if (conf->hdlc_streaming == WANOPT_YES) {
+		printk(KERN_INFO "%s: Enabling HDLC STREAMING Mode\n",
+			wandev->name);
+		card->u.c.protocol_options = HDLC_STREAMING_MODE;
+	}
+
+
+        /* Setup wanpipe as a router (WANPIPE) or as an API */
+	if( strcmp(conf->usedby, "WANPIPE") == 0) {
+		printk(KERN_INFO "%s: Running in WANPIPE mode !\n",wandev->name);
+		card->u.c.usedby = WANPIPE;
+
+	} else if( strcmp(conf->usedby, "API") == 0){
+
+#ifdef CHDLC_API 
+		card->u.c.usedby = API;
+		printk(KERN_INFO "%s: Running in API mode !\n",wandev->name);
+#else
+		printk(KERN_INFO "%s: API Mode is not supported!\n",
+			wandev->name);
+		printk(KERN_INFO "%s: Chdlc API patch can be obtained from Sangoma Tech.\n",
+					wandev->name);
+                kfree(chdlc_priv_area);
+		return -EINVAL;
+#endif
+	}
+
+
+	/* Get Multicast Information */
+	chdlc_priv_area->mc = conf->mc;
+
+	/* prepare network device data space for registration */
+	dev->name = card->u.c.if_name;
+	dev->init = &if_init;
+	dev->priv = chdlc_priv_area;
+
+	return 0;
+}
+
+/*============================================================================
+ * Delete logical channel.
+ */
+static int del_if (wan_device_t* wandev, struct device* dev)
+{
+
+/* FIXME: This code generates kernel panic during
+          router stop!. Investigate futher.
+	  (Error is dereferencing a NULL pointer)
+
+	if(dev->priv){
+
+		kfree(dev->priv);
+                dev->priv = NULL;
+
+        }
+*/
+	return 0;
+}
+
+
+/****** Network Device Interface ********************************************/
+
+/*============================================================================
+ * Initialize Linux network interface.
+ *
+ * This routine is called only once for each interface, during Linux network
+ * interface registration.  Returning anything but zero will fail interface
+ * registration.
+ */
+static int if_init (struct device* dev)
+	{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+	wan_device_t* wandev = &card->wandev;
+#ifndef LINUX_2_1
+	int i;
+#endif
+
+	/* 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;
+
+	/* Initialize media-specific parameters */
+	dev->flags		|= IFF_POINTTOPOINT;
+
+	/* Enable Mulitcasting if user selected */
+	if (chdlc_priv_area->mc == WANOPT_YES){
+		dev->flags 	|= IFF_MULTICAST;
+	}
+
+#ifndef LINUX_2_1
+	dev->family		= AF_INET;
+#endif	
+	dev->type		= ARPHRD_PPP;	/* ARP hw type -- dummy value */
+	dev->mtu		= card->wandev.mtu;
+	dev->hard_header_len	= CHDLC_HDR_LEN;
+
+	/* Initialize hardware parameters */
+	dev->irq	= wandev->irq;
+	dev->dma	= wandev->dma;
+	dev->base_addr	= wandev->ioport;
+	dev->mem_start	= wandev->maddr;
+	dev->mem_end	= wandev->maddr + wandev->msize - 1;
+
+	/* Set transmit buffer queue length 
+	 * If too low packets will not be retransmitted 
+         * by stack.
+	 */
+        dev->tx_queue_len = 100;
+   
+	/* Initialize socket buffers */
+#ifdef LINUX_2_1
+	dev_init_buffers(dev);
+#else
+        for (i = 0; i < DEV_NUMBUFFS; ++i)
+                skb_queue_head_init(&dev->buffs[i]);
+#endif
+
+	return 0;
+}
+
+/*============================================================================
+ * Open network interface.
+ * o enable communications and interrupts.
+ * o prevent module from unloading by incrementing use count
+ *
+ * Return 0 if O.k. or errno.
+ */
+static int if_open (struct device* dev)
+{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+	SHARED_MEMORY_INFO_STRUCT* flags = card->u.c.flags;
+	struct timeval tv;
+	int err = 0;
+
+	/* Only one open per interface is allowed */
+
+	if(dev->start)
+		return -EBUSY;
+	
+	if(test_and_set_bit(1, (void*)&card->wandev.critical)) {
+		return -EAGAIN;
+	}
+	
+	/* Setup the Board for CHDLC */
+	if (set_chdlc_config(card)) {
+		clear_bit(1, (void*)&card->wandev.critical);
+		return -EIO;
+	}
+
+	if (!card->configured && !card->wandev.piggyback){	
+		/* Perform interrupt testing */
+		err = intr_test(card, dev);
+
+		if(err || (Intr_test_counter < MAX_INTR_TEST_COUNTER)) { 
+			printk(KERN_ERR "%s: Interrupt test failed (%i)\n",
+					card->devname, Intr_test_counter);
+			printk(KERN_ERR "%s: Please choose another interrupt\n",
+					card->devname);
+			clear_bit(1, (void*)&card->wandev.critical);
+			return -EIO;
+		}
+		
+		printk(KERN_INFO "%s: Interrupt test passed (%i)\n", 
+				card->devname, Intr_test_counter);
+		card->configured = 1;
+	}else{
+		printk(KERN_INFO "%s: Card configured, skip interrupt test\n", 
+				card->devname);
+	}
+
+	/* Initialize Rx/Tx buffer control fields */
+	init_chdlc_tx_rx_buff(card, dev);
+
+	/* Set interrupt mode and mask */
+        if (chdlc_set_intr_mode(card, APP_INT_ON_RX_FRAME |
+                		APP_INT_ON_GLOBAL_EXCEP_COND |
+                		APP_INT_ON_TX_FRAME |
+                		APP_INT_ON_CHDLC_EXCEP_COND | APP_INT_ON_TIMER)){
+
+			clear_bit(1, (void*)&card->wandev.critical);
+                        return -EIO;
+        }
+	
+
+	/* Mask the Transmit and Timer interrupt */
+	flags->interrupt_info_struct.interrupt_permission &= 
+		~(APP_INT_ON_TX_FRAME | APP_INT_ON_TIMER);
+
+
+	/* Enable communications */
+	if (chdlc_comm_enable(card)) {
+		clear_bit(1, (void*)&card->wandev.critical);
+		return -EIO;
+	}
+
+	clear_bit(1, (void*)&card->wandev.critical);
+
+	port_set_state(card, WAN_CONNECTING);
+	do_gettimeofday(&tv);
+	chdlc_priv_area->router_start_time = tv.tv_sec;
+ 
+	dev->interrupt = 0;
+	dev->tbusy = 0;
+	dev->start = 1;
+	dev->flags |= IFF_POINTTOPOINT;
+	wanpipe_open(card);
+
+	return err;
+}
+
+/*============================================================================
+ * Close network interface.
+ * o if this is the last close, then disable communications and interrupts.
+ * o reset flags.
+ */
+static int if_close (struct device* dev)
+{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+
+	if(test_and_set_bit(1, (void*)&card->wandev.critical))
+		return -EAGAIN;
+
+	dev->start = 0;
+	wanpipe_close(card);
+	port_set_state(card, WAN_DISCONNECTED);
+	chdlc_set_intr_mode(card, 0);
+	chdlc_comm_disable(card);
+
+	clear_bit(1, (void*)&card->wandev.critical);
+
+	return 0;
+}
+
+/*============================================================================
+ * Build media header.
+ *
+ * The trick here is to put packet type (Ethertype) into 'protocol' field of
+ * the socket buffer, so that we don't forget it.  If packet type is not
+ * supported, set skb->protocol to 0 and discard packet later.
+ *
+ * Return:	media header length.
+ */
+static int if_header (struct sk_buff* skb, struct device* dev,
+	unsigned short type, void* daddr, void* saddr, unsigned len)
+{
+	skb->protocol = htons(type);
+
+	return CHDLC_HDR_LEN;
+}
+
+/*============================================================================
+ * Re-build media header.
+ *
+ * Return:	1	physical address resolved.
+ *		0	physical address not resolved
+ */
+#ifdef LINUX_2_1
+static int if_rebuild_hdr (struct sk_buff *skb)
+{
+	return 1;
+}
+#else
+static int if_rebuild_hdr (void* hdr, struct device* dev, unsigned long raddr,
+                           struct sk_buff* skb)
+{
+        return 1;
+}
+#endif
+
+/*============================================================================
+ * Send a packet on a network interface.
+ * o set tbusy flag (marks start of the transmission) to block a timer-based
+ *   transmit from overlapping.
+ * o check link state. If link is not up, then drop the packet.
+ * o execute adapter send command.
+ * o free socket buffer
+ *
+ * Return:	0	complete (socket buffer must be freed)
+ *		non-0	packet may be re-transmitted (tbusy must be set)
+ *
+ * Notes:
+ * 1. This routine is called either by the protocol stack or by the "net
+ *    bottom half" (with interrupts enabled).
+ * 2. Setting tbusy flag will inhibit further transmit requests from the
+ *    protocol stack and can be used for flow control with protocol layer.
+ */
+static int if_send (struct sk_buff* skb, struct device* dev)
+{
+	chdlc_private_area_t *chdlc_priv_area = dev->priv;
+	sdla_t *card = chdlc_priv_area->card;
+	SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
+	INTERRUPT_INFORMATION_STRUCT *chdlc_int = &flags->interrupt_info_struct;
+	int udp_type = 0;
+	unsigned long smp_flags;
+
+	if(skb == NULL) {
+		/* If we get here, some higher layer thinks we've missed an
+		 * tx-done interrupt.
+		 */
+		printk(KERN_INFO "%s: interface %s got kicked!\n",
+			card->devname, dev->name);
+		mark_bh(NET_BH);
+		return 0;
+	}
+
+	if(dev->tbusy) {
+
+		/* If our device stays busy for at least 5 seconds then we will
+		 * kick start the device by making dev->tbusy = 0.  We expect 
+		 * that our device never stays busy more than 5 seconds. So this
+		 * is only used as a last resort. 
+		 */
+                ++card->wandev.stats.collisions;
+
+		if((jiffies - chdlc_priv_area->tick_counter) < (5 * HZ)) {
+			return 1;
+		}
+
+		printk (KERN_INFO "%s: Transmit timeout !\n",
+			card->devname);
+
+		/* unbusy the interface */
+		dev->tbusy = 0;
+	}
+	
+   	if(ntohs(skb->protocol) != 0x16) {
+
+		/* check the udp packet type */
+		udp_type = udp_pkt_type(skb, card);
+		if(udp_type == UDP_CPIPE_TYPE) {
+                        if(store_udp_mgmt_pkt(UDP_PKT_FRM_STACK, card, skb, dev,
+                                chdlc_priv_area))
+	                	chdlc_int->interrupt_permission |=
+					APP_INT_ON_TIMER;
+			return 0;
+		}
+
+		/* check to see if the source IP address is a broadcast or */
+		/* multicast IP address */
+                if(chk_bcast_mcast_addr(card, dev, skb))
+                        return 0;
+        }
+
+	/* Lock the 508 Card: SMP is supported */
+      	if(card->hw.type != SDLA_S514){
+		s508_lock(card,&smp_flags);
+	} 
+
+    	if(test_and_set_bit(0, (void*)&card->wandev.critical)) {
+	
+		printk(KERN_INFO "%s: Critical in if_send: %x\n",
+					card->wandev.name,card->wandev.critical);
+                ++card->wandev.stats.tx_dropped;
+#ifdef LINUX_2_1
+    		dev_kfree_skb(skb);
+#else
+                dev_kfree_skb(skb, FREE_WRITE);
+#endif	
+		if(card->hw.type != SDLA_S514){
+			s508_unlock(card,&smp_flags);
+		}
+		return 0;
+	}
+
+	if(card->u.c.state != WAN_CONNECTED)
+       		++card->wandev.stats.tx_dropped;
+
+	else if(!skb->protocol)
+        	++card->wandev.stats.tx_errors;
+
+	else {
+		void* data = skb->data;
+		unsigned len = skb->len;
+		unsigned char attr;
+
+		/* If it's an API packet pull off the API
+		 * header. Also check that the packet size
+		 * is larger than the API header
+	         */
+		if (card->u.c.usedby == API){
+			api_tx_hdr_t* api_tx_hdr;
+
+			if (len <= sizeof(api_tx_hdr_t)){
+#ifdef LINUX_2_1
+ 		               	dev_kfree_skb(skb);
+#else
+                		dev_kfree_skb(skb, FREE_WRITE);
+#endif
+				++card->wandev.stats.tx_dropped;
+				clear_bit(0, (void*)&card->wandev.critical);
+				if(card->hw.type != SDLA_S514){
+					s508_unlock(card,&smp_flags);
+				}
+                		return 0;
+			}
+				
+			api_tx_hdr = (api_tx_hdr_t *)data;
+			attr = api_tx_hdr->attr;
+			data += sizeof(api_tx_hdr_t);
+			len -= sizeof(api_tx_hdr_t);
+		}
+
+		if(chdlc_send(card, data, len)) {
+			dev->tbusy = 1;
+			chdlc_priv_area->tick_counter = jiffies;
+			chdlc_int->interrupt_permission |= APP_INT_ON_TX_FRAME;
+		}
+		else {
+			++card->wandev.stats.tx_packets;
+#ifdef LINUX_2_1
+                        card->wandev.stats.tx_bytes += len;
+#endif
+		}	
+	}
+
+	if (!dev->tbusy) {
+#ifdef LINUX_2_1
+		dev_kfree_skb(skb);
+#else
+                dev_kfree_skb(skb, FREE_WRITE);
+#endif
+	}
+
+	clear_bit(0, (void*)&card->wandev.critical);
+	if(card->hw.type != SDLA_S514){
+		s508_unlock(card,&smp_flags);
+	}
+	return dev->tbusy;
+}
+
+
+/*============================================================================
+ * Check to see if the packet to be transmitted contains a broadcast or
+ * multicast source IP address.
+ */
+
+static int chk_bcast_mcast_addr(sdla_t *card, struct device* dev,
+				struct sk_buff *skb)
+{
+	u32 src_ip_addr;
+        u32 broadcast_ip_addr = 0;
+#ifdef LINUX_2_1
+        struct in_device *in_dev;
+#endif
+        /* read the IP source address from the outgoing packet */
+        src_ip_addr = *(u32 *)(skb->data + 12);
+
+	/* read the IP broadcast address for the device */
+#ifdef LINUX_2_1
+        in_dev = dev->ip_ptr;
+        if(in_dev != NULL) {
+                struct in_ifaddr *ifa= in_dev->ifa_list;
+                if(ifa != NULL)
+                        broadcast_ip_addr = ifa->ifa_broadcast;
+                else
+                        return 0;
+        }
+#else
+        broadcast_ip_addr = dev->pa_brdaddr;
+#endif
+ 
+        /* check if the IP Source Address is a Broadcast address */
+        if((dev->flags & IFF_BROADCAST) && (src_ip_addr == broadcast_ip_addr)) {
+                printk(KERN_INFO "%s: Broadcast Source Address silently discarded\n",
+				card->devname);
+#ifdef LINUX_2_1
+                dev_kfree_skb(skb);
+#else
+                dev_kfree_skb(skb, FREE_WRITE);
+#endif
+                ++card->wandev.stats.tx_dropped;
+                return 1;
+        } 
+
+        /* check if the IP Source Address is a Multicast address */
+        if((ntohl(src_ip_addr) >= 0xE0000001) &&
+		(ntohl(src_ip_addr) <= 0xFFFFFFFE)) {
+                printk(KERN_INFO "%s: Multicast Source Address silently discarded\n",
+				card->devname);
+#ifdef LINUX_2_1
+                dev_kfree_skb(skb);
+#else
+                dev_kfree_skb(skb, FREE_WRITE);
+#endif
+                ++card->wandev.stats.tx_dropped;
+                return 1;
+        }
+
+        return 0;
+}
+
+
+/*============================================================================
+ * Reply to UDP Management system.
+ * Return length of reply.
+ */
+static int reply_udp( unsigned char *data, unsigned int mbox_len )
+{
+
+	unsigned short len, udp_length, temp, ip_length;
+	unsigned long ip_temp;
+	int even_bound = 0;
+  	chdlc_udp_pkt_t *c_udp_pkt = (chdlc_udp_pkt_t *)data;
+	 
+	/* Set length of packet */
+	len = sizeof(ip_pkt_t)+ 
+	      sizeof(udp_pkt_t)+
+	      sizeof(wp_mgmt_t)+
+	      sizeof(cblock_t)+
+	      sizeof(trace_info_t)+ 
+	      mbox_len;
+
+	/* fill in UDP reply */
+	c_udp_pkt->wp_mgmt.request_reply = UDPMGMT_REPLY;
+   
+	/* fill in UDP length */
+	udp_length = sizeof(udp_pkt_t)+ 
+		     sizeof(wp_mgmt_t)+
+		     sizeof(cblock_t)+
+	             sizeof(trace_info_t)+
+		     mbox_len; 
+
+ 	/* put it on an even boundary */
+	if ( udp_length & 0x0001 ) {
+		udp_length += 1;
+		len += 1;
+		even_bound = 1;
+	}  
+
+	temp = (udp_length<<8)|(udp_length>>8);
+	c_udp_pkt->udp_pkt.udp_length = temp;
+		 
+	/* swap UDP ports */
+	temp = c_udp_pkt->udp_pkt.udp_src_port;
+	c_udp_pkt->udp_pkt.udp_src_port = 
+			c_udp_pkt->udp_pkt.udp_dst_port; 
+	c_udp_pkt->udp_pkt.udp_dst_port = temp;
+
+	/* add UDP pseudo header */
+	temp = 0x1100;
+	*((unsigned short *)(c_udp_pkt->data+mbox_len+even_bound)) = temp;	
+	temp = (udp_length<<8)|(udp_length>>8);
+	*((unsigned short *)(c_udp_pkt->data+mbox_len+even_bound+2)) = temp;
+
+		 
+	/* calculate UDP checksum */
+	c_udp_pkt->udp_pkt.udp_checksum = 0;
+	c_udp_pkt->udp_pkt.udp_checksum = calc_checksum(&data[UDP_OFFSET],udp_length+UDP_OFFSET);
+
+	/* fill in IP length */
+	ip_length = len;
+	temp = (ip_length<<8)|(ip_length>>8);
+	c_udp_pkt->ip_pkt.total_length = temp;
+  
+	/* swap IP addresses */
+	ip_temp = c_udp_pkt->ip_pkt.ip_src_address;
+	c_udp_pkt->ip_pkt.ip_src_address = c_udp_pkt->ip_pkt.ip_dst_address;
+	c_udp_pkt->ip_pkt.ip_dst_address = ip_temp;
+
+	/* fill in IP checksum */
+	c_udp_pkt->ip_pkt.hdr_checksum = 0;
+	c_udp_pkt->ip_pkt.hdr_checksum = calc_checksum(data,sizeof(ip_pkt_t));
+
+	return len;
+
+} /* reply_udp */
+
+unsigned short calc_checksum (char *data, int len)
+{
+	unsigned short temp; 
+	unsigned long sum=0;
+	int i;
+
+	for( i = 0; i <len; i+=2 ) {
+		memcpy(&temp,&data[i],2);
+		sum += (unsigned long)temp;
+	}
+
+	while (sum >> 16 ) {
+		sum = (sum & 0xffffUL) + (sum >> 16);
+	}
+
+	temp = (unsigned short)sum;
+	temp = ~temp;
+
+	if( temp == 0 ) 
+		temp = 0xffff;
+
+	return temp;	
+}
+
+
+/*============================================================================
+ * Get ethernet-style interface statistics.
+ * Return a pointer to struct enet_statistics.
+ */
+#ifdef LINUX_2_1
+static struct net_device_stats* if_stats (struct device* dev)
+{
+	sdla_t *my_card;
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+
+	my_card = chdlc_priv_area->card;
+	return &my_card->wandev.stats; 
+}
+#else
+static struct enet_statistics* if_stats (struct device* dev)
+{
+        sdla_t *my_card;
+        chdlc_private_area_t* chdlc_priv_area = dev->priv;
+
+        my_card = chdlc_priv_area->card;
+        return &my_card->wandev.stats;
+}
+#endif
+
+/****** Cisco HDLC Firmware Interface Functions *******************************/
+
+/*============================================================================
+ * Read firmware code version.
+ *	Put code version as ASCII string in str. 
+ */
+static int chdlc_read_version (sdla_t* card, char* str)
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	int len;
+	char err;
+	mb->buffer_length = 0;
+	mb->command = READ_CHDLC_CODE_VERSION;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+
+	if(err != COMMAND_OK) {
+		chdlc_error(card,err,mb);
+	}
+	else if (str) {  /* is not null */
+		len = mb->buffer_length;
+		memcpy(str, mb->data, len);
+		str[len] = '\0';
+	}
+	return (err);
+}
+
+/*-----------------------------------------------------------------------------
+ *  Configure CHDLC firmware.
+ */
+static int chdlc_configure (sdla_t* card, void* data)
+{
+	int err;
+	CHDLC_MAILBOX_STRUCT *mailbox = card->mbox;
+	int data_length = sizeof(CHDLC_CONFIGURATION_STRUCT);
+	
+	mailbox->buffer_length = data_length;  
+	memcpy(mailbox->data, data, data_length);
+	mailbox->command = SET_CHDLC_CONFIGURATION;
+	err = sdla_exec(mailbox) ? mailbox->return_code : CMD_TIMEOUT;
+	
+	if (err != COMMAND_OK) chdlc_error (card, err, mailbox);
+                           
+	return err;
+}
+
+
+/*============================================================================
+ * Set interrupt mode -- HDLC Version.
+ */
+
+static int chdlc_set_intr_mode (sdla_t* card, unsigned mode)
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	CHDLC_INT_TRIGGERS_STRUCT* int_data =
+		 (CHDLC_INT_TRIGGERS_STRUCT *)mb->data;
+	int err;
+
+	int_data->CHDLC_interrupt_triggers 	= mode;
+	int_data->IRQ				= card->hw.irq;
+	int_data->interrupt_timer               = 1;
+   
+	mb->buffer_length = sizeof(CHDLC_INT_TRIGGERS_STRUCT);
+	mb->command = SET_CHDLC_INTERRUPT_TRIGGERS;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	if (err != COMMAND_OK)
+		chdlc_error (card, err, mb);
+	return err;
+}
+
+
+/*============================================================================
+ * Enable communications.
+ */
+
+static int chdlc_comm_enable (sdla_t* card)
+{
+	int err;
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+
+	mb->buffer_length = 0;
+	mb->command = ENABLE_CHDLC_COMMUNICATIONS;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	if (err != COMMAND_OK)
+		chdlc_error(card, err, mb);
+	return err;
+}
+
+/*============================================================================
+ * Disable communications and Drop the Modem lines (DCD and RTS).
+ */
+static int chdlc_comm_disable (sdla_t* card)
+{
+	int err;
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+
+	mb->buffer_length = 0;
+	mb->command = DISABLE_CHDLC_COMMUNICATIONS;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	if (err != COMMAND_OK)
+		chdlc_error(card,err,mb);
+
+	mb->command = SET_MODEM_STATUS;
+	mb->buffer_length = 1;
+	mb->data[0] = 0;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	if (err != COMMAND_OK)
+		chdlc_error(card,err,mb);
+
+	return err;
+}
+
+/*============================================================================
+ * Read communication error statistics.
+ */
+static int chdlc_read_comm_err_stats (sdla_t* card)
+{
+        int err;
+        CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+
+        mb->buffer_length = 0;
+        mb->command = READ_COMMS_ERROR_STATS;
+        err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+        if (err != COMMAND_OK)
+                chdlc_error(card,err,mb);
+        return err;
+}
+
+
+/*============================================================================
+ * Read CHDLC operational statistics.
+ */
+static int chdlc_read_op_stats (sdla_t* card)
+{
+        int err;
+        CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+
+        mb->buffer_length = 0;
+        mb->command = READ_CHDLC_OPERATIONAL_STATS;
+        err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+        if (err != COMMAND_OK)
+                chdlc_error(card,err,mb);
+        return err;
+}
+
+
+/*============================================================================
+ * Update communications error and general packet statistics.
+ */
+static int update_comms_stats(sdla_t* card,
+	chdlc_private_area_t* chdlc_priv_area)
+{
+        CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+  	COMMS_ERROR_STATS_STRUCT* err_stats;
+        CHDLC_OPERATIONAL_STATS_STRUCT *op_stats;
+
+	/* on the first timer interrupt, read the comms error statistics */
+	if(chdlc_priv_area->update_comms_stats == 2) {
+		if(chdlc_read_comm_err_stats(card))
+			return 1;
+		err_stats = (COMMS_ERROR_STATS_STRUCT *)mb->data;
+		card->wandev.stats.rx_over_errors = 
+				err_stats->Rx_overrun_err_count;
+		card->wandev.stats.rx_crc_errors = 
+				err_stats->CRC_err_count;
+		card->wandev.stats.rx_frame_errors = 
+				err_stats->Rx_abort_count;
+		card->wandev.stats.rx_fifo_errors = 
+				err_stats->Rx_dis_pri_bfrs_full_count; 
+		card->wandev.stats.rx_missed_errors =
+				card->wandev.stats.rx_fifo_errors;
+		card->wandev.stats.tx_aborted_errors =
+				err_stats->sec_Tx_abort_count;
+	}
+
+        /* on the second timer interrupt, read the operational statistics */
+	else {
+        	if(chdlc_read_op_stats(card))
+                	return 1;
+		op_stats = (CHDLC_OPERATIONAL_STATS_STRUCT *)mb->data;
+		card->wandev.stats.rx_length_errors =
+			(op_stats->Rx_Data_discard_short_count +
+			op_stats->Rx_Data_discard_long_count);
+	}
+
+	return 0;
+}
+
+/*============================================================================
+ * Send packet.
+ *	Return:	0 - o.k.
+ *		1 - no transmit buffers available
+ */
+static int chdlc_send (sdla_t* card, void* data, unsigned len)
+{
+	CHDLC_DATA_TX_STATUS_EL_STRUCT *txbuf = card->u.c.txbuf;
+
+	if (txbuf->opp_flag)
+		return 1;
+	
+	sdla_poke(&card->hw, txbuf->ptr_data_bfr, data, len);
+
+	txbuf->frame_length = len;
+	txbuf->opp_flag = 1;		/* start transmission */
+	
+	/* Update transmit buffer control fields */
+	card->u.c.txbuf = ++txbuf;
+
+	if ((void*)txbuf > card->u.c.txbuf_last)
+		card->u.c.txbuf = card->u.c.txbuf_base;
+
+	return 0;
+}
+
+/****** Firmware Error Handler **********************************************/
+
+/*============================================================================
+ * Firmware error handler.
+ *	This routine is called whenever firmware command returns non-zero
+ *	return code.
+ *
+ * Return zero if previous command has to be cancelled.
+ */
+static int chdlc_error (sdla_t *card, int err, CHDLC_MAILBOX_STRUCT *mb)
+{
+	unsigned cmd = mb->command;
+
+	switch (err) {
+
+	case CMD_TIMEOUT:
+		printk(KERN_ERR "%s: command 0x%02X timed out!\n",
+			card->devname, cmd);
+		break;
+
+	case S514_BOTH_PORTS_SAME_CLK_MODE:
+		if(cmd == SET_CHDLC_CONFIGURATION) {
+			printk(KERN_INFO
+			 "%s: Configure both ports for the same clock source\n",
+				card->devname);
+			break;
+		}
+
+	default:
+		printk(KERN_INFO "%s: command 0x%02X returned 0x%02X!\n",
+			card->devname, cmd, err);
+	}
+
+	return 0;
+}
+
+/****** Interrupt Handlers **************************************************/
+
+/*============================================================================
+ * Cisco HDLC interrupt service routine.
+ */
+STATIC void wpc_isr (sdla_t* card)
+{
+	struct device* dev;
+	chdlc_private_area_t* chdlc_priv_area;
+	SHARED_MEMORY_INFO_STRUCT* flags = NULL;
+	int i, interrupt_serviced = 0;
+	sdla_t *my_card;
+
+
+	/* Check for which port the interrupt has been generated
+	 * Since Secondary Port is piggybacking on the Primary
+         * the check must be done here. 
+	 */
+
+	flags = card->u.c.flags;
+	if (!flags->interrupt_info_struct.interrupt_type){
+		/* Check for a second port (piggybacking) */
+		if((my_card = card->next)){
+			flags = my_card->u.c.flags;
+			if (flags->interrupt_info_struct.interrupt_type){
+				card = my_card;
+			}
+		}
+	}
+
+	dev = card->wandev.dev;
+	
+	card->in_isr = 1;
+	
+	/* if critical due to peripheral operations
+	 * ie. update() or getstats() then reset the interrupt and
+	 * wait for the board to retrigger.
+	 */
+	if(test_bit(1, (void*)&card->wandev.critical)) {
+               	if(card->u.c.flags != NULL) {
+                       	flags = card->u.c.flags;
+			if(flags->interrupt_info_struct.
+					interrupt_type) {
+					flags->interrupt_info_struct.
+						interrupt_type = 0;
+			}
+		}
+		card->in_isr = 0;
+		return;
+	}
+
+
+	/* On a 508 Card, if critical due to if_send 
+         * Major Error !!!
+	 */
+	if(card->hw.type != SDLA_S514) {
+		if(test_and_set_bit(0, (void*)&card->wandev.critical)) {
+			printk(KERN_INFO "%s: Critical while in ISR: %x\n",
+				card->devname, card->wandev.critical);
+			card->in_isr = 0;
+			return;
+		}
+	}
+
+	/* FIXME: Take this check out later in the future */
+	if(card->u.c.flags != NULL) {
+	
+		flags = card->u.c.flags;
+
+		switch(flags->interrupt_info_struct.interrupt_type) {
+
+		case RX_APP_INT_PEND:	/* 0x01: receive interrupt */
+			interrupt_serviced = 1;
+			rx_intr(card);
+			break;
+
+		case TX_APP_INT_PEND:	/* 0x02: transmit interrupt */
+			interrupt_serviced = 1;
+			flags->interrupt_info_struct.interrupt_permission &=
+				 ~APP_INT_ON_TX_FRAME;
+
+			chdlc_priv_area = dev->priv;
+			dev->tbusy = 0;	
+			mark_bh(NET_BH);
+			break;
+
+		case COMMAND_COMPLETE_APP_INT_PEND:/* 0x04: cmd cplt */
+			interrupt_serviced = 1;
+			++ Intr_test_counter;
+			break;
+
+		case CHDLC_EXCEP_COND_APP_INT_PEND:	/* 0x20 */
+			interrupt_serviced = 1;
+			process_chdlc_exception(card);
+			break;
+
+		case GLOBAL_EXCEP_COND_APP_INT_PEND:
+			interrupt_serviced = 1;
+			process_global_exception(card);
+			break;
+
+		case TIMER_APP_INT_PEND:
+			interrupt_serviced = 1;
+			timer_intr(card);
+			break;
+
+		default:
+			break;
+		}	
+	}
+
+	if(!interrupt_serviced) {
+		printk(KERN_INFO "%s: spurious interrupt 0x%02X!\n", 
+			card->devname,
+			flags->interrupt_info_struct.interrupt_type);
+		printk(KERN_INFO "Code name: ");
+		for(i = 0; i < 4; i ++)
+			printk(KERN_INFO "%c",
+				flags->global_info_struct.codename[i]); 
+		printk(KERN_INFO "\nCode version: ");
+	 	for(i = 0; i < 4; i ++)
+			printk(KERN_INFO "%c", 
+				flags->global_info_struct.codeversion[i]); 
+		printk(KERN_INFO "\n");	
+	}
+
+	card->in_isr = 0;
+	flags->interrupt_info_struct.interrupt_type = 0;
+        if(card->hw.type != SDLA_S514){
+        	clear_bit(0, (void*)&card->wandev.critical);
+	}
+        
+}
+
+/*============================================================================
+ * Receive interrupt handler.
+ */
+static void rx_intr (sdla_t* card)
+{
+	struct device 			*dev;
+	chdlc_private_area_t		*chdlc_priv_area;
+	SHARED_MEMORY_INFO_STRUCT 	*flags = card->u.c.flags;
+	CHDLC_DATA_RX_STATUS_EL_STRUCT	*rxbuf = card->u.c.rxmb;
+	struct sk_buff			*skb;
+	unsigned 			len;
+	void				*buf;
+	int 				i,udp_type;
+	
+	if (rxbuf->opp_flag != 0x01) {
+		printk(KERN_INFO 
+			"%s: corrupted Rx buffer @ 0x%X, flag = 0x%02X!\n", 
+			card->devname, (unsigned)rxbuf, rxbuf->opp_flag);
+                printk(KERN_INFO "Code name: ");
+                for(i = 0; i < 4; i ++)
+                        printk(KERN_INFO "%c",
+                                flags->global_info_struct.codename[i]);
+                printk(KERN_INFO "\nCode version: ");
+                for(i = 0; i < 4; i ++)
+                        printk(KERN_INFO "%c",
+                                flags->global_info_struct.codeversion[i]);
+                printk(KERN_INFO "\n");
+		return;
+	}
+
+	dev = card->wandev.dev;
+	chdlc_priv_area = dev->priv;
+
+	if(dev && dev->start) {
+
+		len  = rxbuf->frame_length;
+
+		/* Allocate socket buffer */
+		skb = dev_alloc_skb(len);
+
+		if (skb != NULL) {
+			/* Copy data to the socket buffer */
+			unsigned addr = rxbuf->ptr_data_bfr;
+		
+			if((addr + len) >
+			card->u.c.rx_top + 1) {
+				unsigned tmp = 
+				card->u.c.rx_top - addr + 1;
+				buf = skb_put(skb, tmp);
+				sdla_peek(&card->hw, addr, buf, tmp);
+				addr = card->u.c.rx_base;
+				len -= tmp;
+			}
+		
+			buf = skb_put(skb, len);
+			sdla_peek(&card->hw, addr, buf, len);
+
+			/* Decapsulate packet */
+			skb->protocol = htons(ETH_P_IP);
+
+			card->wandev.stats.rx_packets ++;
+#ifdef LINUX_2_1
+			card->wandev.stats.rx_bytes += skb->len;
+#endif
+			udp_type = udp_pkt_type( skb, card );
+
+			if(udp_type == UDP_CPIPE_TYPE) {
+				if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK,
+					card, skb, dev, chdlc_priv_area)) {
+       				        flags->interrupt_info_struct.
+						interrupt_permission |= 
+							APP_INT_ON_TIMER; 
+				}
+
+			} else {
+ 
+				if(card->u.c.usedby == API) {
+					api_rx_hdr_t* api_rx_hdr;
+              				skb_push(skb, sizeof(api_rx_hdr_t));
+                                        api_rx_hdr =
+						(api_rx_hdr_t*)&skb->data[0x00];
+					api_rx_hdr->error_flag =
+						rxbuf->error_flag;
+          				api_rx_hdr->time_stamp =
+                                                rxbuf->time_stamp;
+                                	skb->protocol = htons(0x16);
+                                	skb->pkt_type = PACKET_HOST;
+				}
+
+/* FIXME: we should check to see if the received packet is a multicast packet so that we can increment the multicast statistic
+                                ++ chdlc_priv_area->if_stats.multicast;
+*/
+                               	/* Pass it up the protocol stack */
+                                skb->dev = dev;
+                                skb->mac.raw  = skb->data;
+                                netif_rx(skb);
+			}
+
+		} else {
+			printk(KERN_INFO
+				"%s: no socket buffers available!\n",
+					card->devname);
+			++card->wandev.stats.rx_dropped;
+		}
+     	}
+
+	/* Release buffer element and calculate a pointer to the next one */
+	rxbuf->opp_flag = 0x00;
+	card->u.c.rxmb = ++ rxbuf;
+	if((void*)rxbuf > card->u.c.rxbuf_last)
+		card->u.c.rxmb = card->u.c.rxbuf_base;
+}
+
+/*============================================================================
+ * Timer interrupt handler.
+ * The timer interrupt is used for two purposes:
+ *    1) Processing udp calls from 'cpipemon'.
+ *    2) Reading board-level statistics for updating the proc file system.
+ */
+void timer_intr(sdla_t *card)
+{
+        struct device* dev;
+        chdlc_private_area_t* chdlc_priv_area = NULL;
+        SHARED_MEMORY_INFO_STRUCT* flags = NULL;
+
+        dev = card->wandev.dev; 
+        chdlc_priv_area = dev->priv;
+
+	/* process a udp call if pending */
+       	if(chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_UDP) {
+               	process_udp_mgmt_pkt(card, dev,
+                       chdlc_priv_area);
+		chdlc_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_UDP;
+        }
+
+	/* read the communications statistics if required */
+	if(chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_UPDATE) {
+		update_comms_stats(card, chdlc_priv_area);
+                if(!(-- chdlc_priv_area->update_comms_stats)) {
+			chdlc_priv_area->timer_int_enabled &= 
+				~TMR_INT_ENABLED_UPDATE;
+		}
+        }
+
+	/* only disable the timer interrupt if there are no udp or statistic */
+	/* updates pending */
+        if(!chdlc_priv_area->timer_int_enabled) {
+                flags = card->u.c.flags;
+                flags->interrupt_info_struct.interrupt_permission &=
+                        ~APP_INT_ON_TIMER;
+        }
+}
+
+/*------------------------------------------------------------------------------
+  Miscellaneous Functions
+	- set_chdlc_config() used to set configuration options on the board
+------------------------------------------------------------------------------*/
+
+static int set_chdlc_config(sdla_t* card)
+{
+
+	struct device * dev = card->wandev.dev;
+	chdlc_private_area_t *chdlc_priv_area = dev->priv;
+	CHDLC_CONFIGURATION_STRUCT cfg;
+
+	memset(&cfg, 0, sizeof(CHDLC_CONFIGURATION_STRUCT));
+
+	if(card->wandev.clocking)
+		cfg.baud_rate = card->wandev.bps;
+
+	cfg.line_config_options = (card->wandev.interface == WANOPT_RS232) ?
+		INTERFACE_LEVEL_RS232 : INTERFACE_LEVEL_V35;
+
+	cfg.modem_config_options	= 0;
+	cfg.modem_status_timer		= 100;
+
+	cfg.CHDLC_protocol_options	= card->u.c.protocol_options;
+	cfg.percent_data_buffer_for_Tx	= 50;
+	cfg.CHDLC_statistics_options	= (CHDLC_TX_DATA_BYTE_COUNT_STAT |
+		CHDLC_RX_DATA_BYTE_COUNT_STAT);
+	cfg.max_CHDLC_data_field_length	= card->wandev.mtu;
+	cfg.transmit_keepalive_timer	= card->u.c.kpalv_tx;
+	cfg.receive_keepalive_timer	= card->u.c.kpalv_rx;
+	cfg.keepalive_error_tolerance	= card->u.c.kpalv_err;
+	cfg.SLARP_request_timer		= card->u.c.slarp_timer;
+
+	if (cfg.SLARP_request_timer) {
+		cfg.IP_address		= 0;
+		cfg.IP_netmask		= 0;
+	}
+	else {
+#ifdef LINUX_2_1
+                struct in_device *in_dev = dev->ip_ptr;
+
+		if(in_dev != NULL) {
+			struct in_ifaddr *ifa = in_dev->ifa_list;
+
+			if (ifa != NULL ) {
+				cfg.IP_address	= ntohl(ifa->ifa_local);
+				cfg.IP_netmask	= ntohl(ifa->ifa_mask); 
+				chdlc_priv_area->IP_address = 
+					ntohl(ifa->ifa_local);
+				chdlc_priv_area->IP_netmask =
+					ntohl(ifa->ifa_mask); 
+			}
+		}
+#else
+                cfg.IP_address          = ntohl(dev->pa_addr);
+                cfg.IP_netmask          = ntohl(dev->pa_mask);
+		chdlc_priv_area->IP_address = ntohl(dev->pa_addr);
+		chdlc_priv_area->IP_netmask = ntohl(dev->pa_mask);
+#endif
+
+		/* FIXME: We must re-think this message in next release
+		if((cfg.IP_address & 0x000000FF) > 2) {
+			printk(KERN_WARNING "\n");
+	                printk(KERN_WARNING "  WARNING:%s configured with an\n",
+				card->devname);
+			printk(KERN_WARNING "  invalid local IP address.\n");
+                        printk(KERN_WARNING "  Slarp pragmatics will fail.\n");
+                        printk(KERN_WARNING "  IP address should be of the\n");
+			printk(KERN_WARNING "  format A.B.C.1 or A.B.C.2.\n");
+		}
+		*/		
+	}
+	
+	return chdlc_configure(card, &cfg);
+}
+
+
+
+/*============================================================================
+ * Process global exception condition
+ */
+static int process_global_exception(sdla_t *card)
+{
+	CHDLC_MAILBOX_STRUCT* mbox = card->mbox;
+	int err;
+
+	mbox->buffer_length = 0;
+	mbox->command = READ_GLOBAL_EXCEPTION_CONDITION;
+	err = sdla_exec(mbox) ? mbox->return_code : CMD_TIMEOUT;
+
+	if(err != CMD_TIMEOUT ){
+	
+		switch(mbox->return_code) {
+         
+	      	case EXCEP_MODEM_STATUS_CHANGE:
+
+			printk(KERN_INFO "%s: Modem status change\n",
+				card->devname);
+
+			switch(mbox->data[0] & (DCD_HIGH | CTS_HIGH)) {
+				case (DCD_HIGH):
+					printk(KERN_INFO "%s: DCD high, CTS low\n",card->devname);
+					break;
+				case (CTS_HIGH):
+                                        printk(KERN_INFO "%s: DCD low, CTS high\n",card->devname);                                        break;
+                                case ((DCD_HIGH | CTS_HIGH)):
+                                        printk(KERN_INFO "%s: DCD high, CTS high\n",card->devname);
+                                        break;
+				default:
+                                        printk(KERN_INFO "%s: DCD low, CTS low\n",card->devname);
+                                        break;
+			}
+			break;
+
+                case EXCEP_TRC_DISABLED:
+                        printk(KERN_INFO "%s: Line trace disabled\n",
+				card->devname);
+                        break;
+
+		case EXCEP_IRQ_TIMEOUT:
+			printk(KERN_INFO "%s: IRQ timeout occurred\n",
+				card->devname); 
+			break;
+
+                default:
+                        printk(KERN_INFO "%s: Global exception %x\n",
+				card->devname, mbox->return_code);
+                        break;
+                }
+	}
+	return 0;
+}
+
+
+/*============================================================================
+ * Process chdlc exception condition
+ */
+static int process_chdlc_exception(sdla_t *card)
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	int err;
+
+	mb->buffer_length = 0;
+	mb->command = READ_CHDLC_EXCEPTION_CONDITION;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	if(err != CMD_TIMEOUT) {
+	
+		switch (err) {
+
+		case EXCEP_LINK_ACTIVE:
+			port_set_state(card, WAN_CONNECTED);
+			break;
+
+		case EXCEP_LINK_INACTIVE_MODEM:
+			port_set_state(card, WAN_DISCONNECTED);
+			unconfigure_ip(card);
+			break;
+
+		case EXCEP_LINK_INACTIVE_KPALV:
+			port_set_state(card, WAN_DISCONNECTED);
+			printk(KERN_INFO "%s: Keepalive timer expired.\n",
+				 		card->devname);
+			unconfigure_ip(card);
+			break;
+
+		case EXCEP_IP_ADDRESS_DISCOVERED:
+			if (configure_ip(card)) 
+				return -1;
+			break;
+
+		case EXCEP_LOOPBACK_CONDITION:
+			printk(KERN_INFO "%s: Loopback Condition Detected.\n",
+						card->devname);
+			break;
+
+		case NO_CHDLC_EXCEP_COND_TO_REPORT:
+			printk(KERN_INFO "%s: No exceptions reported.\n",
+						card->devname);
+			break;
+		}
+
+	}
+	return 0;
+}
+
+
+/*============================================================================
+ * Configure IP from SLARP negotiation
+ * This adds dynamic routes when SLARP has provided valid addresses
+ */
+
+static int configure_ip (sdla_t* card)
+{
+	struct device *dev = card->wandev.dev;
+        chdlc_private_area_t *chdlc_priv_area = dev->priv;
+        char err;
+
+        /* set to discover */
+        if(card->u.c.slarp_timer != 0x00) {
+		CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+		CHDLC_CONFIGURATION_STRUCT *cfg;
+
+     		mb->buffer_length = 0;
+		mb->command = READ_CHDLC_CONFIGURATION;
+		err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+	
+		if(err != COMMAND_OK) {
+			chdlc_error(card,err,mb);
+			return -1;
+		}
+
+		cfg = (CHDLC_CONFIGURATION_STRUCT *)mb->data;
+                chdlc_priv_area->IP_address = cfg->IP_address;
+                chdlc_priv_area->IP_netmask = cfg->IP_netmask;
+        }
+
+	/* Set flag to add route */
+	chdlc_priv_area->route_status = ADD_ROUTE;
+
+	/* The idea here is to add the route in the poll routine.
+	   This way, we aren't in interrupt context when adding routes */
+	card->poll = process_route;
+
+	return 0;
+}
+
+
+/*============================================================================
+ * Un-Configure IP negotiated by SLARP
+ * This removes dynamic routes when the link becomes inactive.
+ */
+
+static int unconfigure_ip (sdla_t* card)
+{
+	struct device *dev = card->wandev.dev;
+	chdlc_private_area_t *chdlc_priv_area= dev->priv;
+
+	if (chdlc_priv_area->route_status == ROUTE_ADDED) {
+	      	chdlc_priv_area->route_status = REMOVE_ROUTE;
+		/* The idea here is to delete the route in 
+		 * the poll routine.
+	   	 * This way, we aren't in interrupt context 
+		 * when adding routes 
+		 */
+                card->poll = process_route;
+	}
+	return 0;
+}
+
+/*============================================================================
+ * Routine to add/remove routes 
+ * Called like a polling routine when Routes are flagged to be added/removed.
+ */
+
+static void process_route (sdla_t *card)
+{
+        struct device *dev = card->wandev.dev;
+        unsigned char port_num;
+        chdlc_private_area_t *chdlc_priv_area = NULL;
+	u32 local_IP_addr = 0;
+	u32 remote_IP_addr = 0;
+	u32 IP_netmask, IP_addr;
+        int err = 0;
+#ifdef LINUX_2_1
+	struct in_device *in_dev;
+	mm_segment_t fs;
+	struct ifreq if_info;
+        struct sockaddr_in *if_data1, *if_data2;
+#else
+	unsigned long fs = 0;
+        struct rtentry route;
+#endif
+	
+        chdlc_priv_area = dev->priv;
+        port_num = card->u.c.comm_port;
+
+	if((chdlc_priv_area->route_status == ADD_ROUTE) &&
+		((chdlc_priv_area->IP_address & 0x000000FF) > 2)) {
+		printk(KERN_INFO "%s: Dynamic route failure.\n",card->devname);
+                if(card->u.c.slarp_timer) {
+			printk(KERN_INFO "%s: Bad IP address %s received\n",
+				card->devname,
+				in_ntoa(ntohl(chdlc_priv_area->IP_address)));
+                        printk(KERN_INFO "%s: from remote station.\n",
+				card->devname);
+                }else{ 
+                        printk(KERN_INFO "%s: Bad IP address %s issued\n",
+				card->devname,
+				in_ntoa(ntohl(chdlc_priv_area->IP_address)));
+                        printk(KERN_INFO "%s: to remote station. Local\n",
+				card->devname);
+			printk(KERN_INFO "%s: IP address must be A.B.C.1\n",
+				card->devname);
+			printk(KERN_INFO "%s: or A.B.C.2.\n",card->devname);
+		}
+
+		/* remove the route due to the IP address error condition */
+		chdlc_priv_area->route_status = REMOVE_ROUTE;
+		err = 1;
+   	}
+
+	/* If we are removing a route with bad IP addressing, then use the */
+	/* locally configured IP addresses */
+        if((chdlc_priv_area->route_status == REMOVE_ROUTE) && err) {
+
+ 	        /* do not remove a bad route that has already been removed */
+        	if(chdlc_priv_area->route_removed) {
+                	card->poll = NULL;
+	                return;
+        	}
+
+#ifdef LINUX_2_1
+                in_dev = dev->ip_ptr;
+
+                if(in_dev != NULL) {
+                        struct in_ifaddr *ifa = in_dev->ifa_list;
+                        if (ifa != NULL ) {
+                                local_IP_addr = ifa->ifa_local;
+                                IP_netmask  = ifa->ifa_mask;
+                        }
+                }
+#else
+                local_IP_addr = dev->pa_addr;
+                remote_IP_addr = dev->pa_dstaddr;
+                IP_netmask = dev->pa_mask;
+#endif
+	}else{ 
+       		/* According to Cisco HDLC, if the point-to-point address is
+		   A.B.C.1, then we are the opposite (A.B.C.2), and vice-versa.
+		*/
+		IP_netmask = ntohl(chdlc_priv_area->IP_netmask);
+	        remote_IP_addr = ntohl(chdlc_priv_area->IP_address);
+        	local_IP_addr = (remote_IP_addr & ntohl(0xFFFFFF00)) +
+                	(~remote_IP_addr & ntohl(0x0003));
+
+	        if(!card->u.c.slarp_timer) {
+			IP_addr = local_IP_addr;
+			local_IP_addr = remote_IP_addr;
+			remote_IP_addr = IP_addr;
+       		}
+	}
+
+        fs = get_fs();                  /* Save file system  */
+        set_fs(get_ds());               /* Get user space block */
+
+#ifdef LINUX_2_1
+        /* Setup a structure for adding/removing routes */
+        memset(&if_info, 0, sizeof(if_info));
+        strcpy(if_info.ifr_name, dev->name);
+
+#else
+	/* Setup a structure for adding/removing routes */
+	dev->pa_mask = IP_netmask;
+	dev->pa_dstaddr = remote_IP_addr;
+	dev->pa_addr = local_IP_addr;
+
+	memset(&route, 0, sizeof(route));
+	route.rt_dev = dev->name;
+	route.rt_flags = 0;
+	((struct sockaddr_in *)&(route.rt_dst))->sin_addr.s_addr =
+			dev->pa_dstaddr;
+	((struct sockaddr_in *)&(route.rt_dst))->sin_family = AF_INET;
+	((struct sockaddr_in *)&(route.rt_genmask))->sin_addr.s_addr =
+			0xFFFFFFFF;
+        ((struct sockaddr_in *)&(route.rt_genmask))->sin_family =
+			AF_INET;
+#endif
+
+	switch (chdlc_priv_area->route_status) {
+
+	case ADD_ROUTE:
+
+		if(!card->u.c.slarp_timer) {
+#ifdef LINUX_2_1
+			if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
+			if_data2->sin_addr.s_addr = remote_IP_addr;
+			if_data2->sin_family = AF_INET;
+			err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
+#else
+                        err = ip_rt_new(&route);
+#endif
+		} else { 
+#ifdef LINUX_2_1
+			if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
+			if_data1->sin_addr.s_addr = local_IP_addr;
+			if_data1->sin_family = AF_INET;
+			if(!(err = devinet_ioctl(SIOCSIFADDR, &if_info))){
+				if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
+				if_data2->sin_addr.s_addr = remote_IP_addr;
+				if_data2->sin_family = AF_INET;
+				err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
+			}
+#else
+               		err = ip_rt_new(&route);
+#endif
+		}
+
+               if(err) {
+			printk(KERN_INFO "%s: Add route %s failed (%d)\n", 
+				card->devname, in_ntoa(remote_IP_addr), err);
+		} else {
+			((chdlc_private_area_t *)dev->priv)->route_status = ROUTE_ADDED;
+			printk(KERN_INFO "%s: Dynamic route added.\n",
+				card->devname);
+			printk(KERN_INFO "%s:    Local IP addr : %s\n",
+				card->devname, in_ntoa(local_IP_addr));
+			printk(KERN_INFO "%s:    Remote IP addr: %s\n",
+				card->devname, in_ntoa(remote_IP_addr));
+			chdlc_priv_area->route_removed = 0;
+		}
+		break;
+
+
+	case REMOVE_ROUTE:
+	
+#ifdef LINUX_2_1
+		/* Change the local ip address of the interface to 0.
+		 * This will also delete the destination route.
+		 */
+		if(!card->u.c.slarp_timer) {
+			if_data2 = (struct sockaddr_in *)&if_info.ifr_dstaddr;
+			if_data2->sin_addr.s_addr = 0;
+			if_data2->sin_family = AF_INET;
+			err = devinet_ioctl(SIOCSIFDSTADDR, &if_info);
+		} else {
+			if_data1 = (struct sockaddr_in *)&if_info.ifr_addr;
+			if_data1->sin_addr.s_addr = 0;
+			if_data1->sin_family = AF_INET;
+			err = devinet_ioctl(SIOCSIFADDR,&if_info);
+		
+		}
+#else
+		/* set the point-to-point IP address to 0.0.0.0 */
+		dev->pa_dstaddr = 0; 
+		err = ip_rt_kill(&route);
+#endif
+		if(err) {
+			printk(KERN_INFO
+				"%s: Remove route %s failed, (err %d)\n",
+					card->devname, in_ntoa(remote_IP_addr),
+					err);
+		} else {
+			((chdlc_private_area_t *)dev->priv)->route_status =
+				NO_ROUTE;
+                        printk(KERN_INFO "%s: Dynamic route removed: %s\n",
+                                        card->devname, in_ntoa(local_IP_addr)); 
+			chdlc_priv_area->route_removed = 1;
+		}
+		break;
+	}
+
+        set_fs(fs);                     /* Restore file system */
+
+        /* Once we've processed the route, stop polling */
+        card->poll = NULL;
+
+}
+
+
+/*=============================================================================
+ * Store a UDP management packet for later processing.
+ */
+
+static int store_udp_mgmt_pkt(char udp_pkt_src, sdla_t* card,
+                                struct sk_buff *skb, struct device* dev,
+                                chdlc_private_area_t* chdlc_priv_area )
+{
+	int udp_pkt_stored = 0;
+
+	if(!chdlc_priv_area->udp_pkt_lgth &&
+	  (skb->len <= MAX_LGTH_UDP_MGNT_PKT)) {
+        	chdlc_priv_area->udp_pkt_lgth = skb->len;
+		chdlc_priv_area->udp_pkt_src = udp_pkt_src;
+       		memcpy(chdlc_priv_area->udp_pkt_data, skb->data, skb->len);
+		chdlc_priv_area->timer_int_enabled = TMR_INT_ENABLED_UDP;
+		udp_pkt_stored = 1;
+	}
+
+#ifdef LINUX_2_1
+	dev_kfree_skb(skb);
+#else
+	if(udp_pkt_src == UDP_PKT_FRM_STACK)
+		dev_kfree_skb(skb, FREE_WRITE);
+	else
+                dev_kfree_skb(skb, FREE_READ);
+#endif
+	
+	return(udp_pkt_stored);
+}
+
+
+/*=============================================================================
+ * Process UDP management packet.
+ */
+
+static int process_udp_mgmt_pkt(sdla_t* card, struct device* dev,
+				chdlc_private_area_t* chdlc_priv_area ) 
+{
+	unsigned char *buf;
+	unsigned int frames, len;
+	struct sk_buff *new_skb;
+	unsigned short buffer_length, real_len;
+	unsigned long data_ptr;
+	unsigned data_length;
+	int udp_mgmt_req_valid = 1;
+	CHDLC_MAILBOX_STRUCT *mb = card->mbox;
+	SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
+	chdlc_udp_pkt_t *chdlc_udp_pkt;
+	struct timeval tv;
+	int err;
+	char ut_char;
+
+	chdlc_udp_pkt = (chdlc_udp_pkt_t *) chdlc_priv_area->udp_pkt_data;
+
+	switch(chdlc_udp_pkt->cblock.command) {
+
+	   	case FT1_MONITOR_STATUS_CTRL:
+		case CPIPE_ENABLE_TRACING:
+	   	case CPIPE_DISABLE_TRACING:
+ 	  	case CPIPE_GET_TRACE_INFO:
+	   	case SET_FT1_MODE:
+			if(chdlc_priv_area->udp_pkt_src == 
+				UDP_PKT_FRM_NETWORK) {
+			     udp_mgmt_req_valid = 0;
+       			}	 
+       			break;
+	   
+		default:
+       			break;
+  	} 
+	
+  	if(!udp_mgmt_req_valid) {
+
+		/* set length to 0 */
+		chdlc_udp_pkt->cblock.buffer_length = 0;
+
+    		/* set return code */
+		chdlc_udp_pkt->cblock.return_code = 0xCD;
+
+   	} else {
+	   	unsigned long trace_status_cfg_addr = 0;
+		TRACE_STATUS_EL_CFG_STRUCT trace_cfg_struct;
+		TRACE_STATUS_ELEMENT_STRUCT trace_element_struct;
+
+		switch(chdlc_udp_pkt->cblock.command) {
+
+		case CPIPE_ENABLE_TRACING:
+		     if (!chdlc_priv_area->TracingEnabled) {
+
+			/* OPERATE_DATALINE_MONITOR */
+
+			mb->buffer_length = sizeof(LINE_TRACE_CONFIG_STRUCT);
+			mb->command = SET_TRACE_CONFIGURATION;
+
+    			((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
+				trace_config = TRACE_ACTIVE;
+			/* Trace delay mode is not used because it slows
+			   down transfer and results in a standoff situation
+			   when there is a lot of data */
+
+			/* Configure the Trace based on user inputs */
+			((LINE_TRACE_CONFIG_STRUCT *)mb->data)->trace_config |= 
+					chdlc_udp_pkt->data[0];
+
+			((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
+			   trace_deactivation_timer = 4000;
+
+
+			err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+			if (err != COMMAND_OK) {
+				chdlc_error(card,err,mb);
+				card->TracingEnabled = 0;
+				chdlc_udp_pkt->cblock.return_code = err;
+				mb->buffer_length = 0;
+				break;
+	    		} 
+
+			/* Get the base address of the trace element list */
+			mb->buffer_length = 0;
+			mb->command = READ_TRACE_CONFIGURATION;
+			err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+
+			if (err != COMMAND_OK) {
+				chdlc_error(card,err,mb);
+				chdlc_priv_area->TracingEnabled = 0;
+				chdlc_udp_pkt->cblock.return_code = err;
+				mb->buffer_length = 0;
+				break;
+	    		} 	
+
+	   		trace_status_cfg_addr =((LINE_TRACE_CONFIG_STRUCT *)
+				mb->data) -> ptr_trace_stat_el_cfg_struct;
+
+			sdla_peek(&card->hw, trace_status_cfg_addr,
+				 &trace_cfg_struct, sizeof(trace_cfg_struct));
+		    
+			chdlc_priv_area->start_trace_addr = trace_cfg_struct.
+				base_addr_trace_status_elements;
+
+			chdlc_priv_area->number_trace_elements = 
+					trace_cfg_struct.number_trace_status_elements;
+
+			chdlc_priv_area->end_trace_addr = (unsigned long)
+					((TRACE_STATUS_ELEMENT_STRUCT *)
+					 chdlc_priv_area->start_trace_addr + 
+					 (chdlc_priv_area->number_trace_elements - 1));
+
+			chdlc_priv_area->base_addr_trace_buffer = 
+					trace_cfg_struct.base_addr_trace_buffer;
+
+			chdlc_priv_area->end_addr_trace_buffer = 
+					trace_cfg_struct.end_addr_trace_buffer;
+
+		    	chdlc_priv_area->curr_trace_addr = 
+					trace_cfg_struct.next_trace_element_to_use;
+
+	    		chdlc_priv_area->available_buffer_space = 2000 - 
+								  sizeof(ip_pkt_t) -
+								  sizeof(udp_pkt_t) -
+							      	  sizeof(wp_mgmt_t) -
+								  sizeof(cblock_t) -
+							          sizeof(trace_info_t);	
+	       	     }
+		     chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
+		     mb->buffer_length = 0;
+	       	     chdlc_priv_area->TracingEnabled = 1;
+	       	     break;
+	   
+
+		case CPIPE_DISABLE_TRACING:
+		     if (chdlc_priv_area->TracingEnabled) {
+
+			/* OPERATE_DATALINE_MONITOR */
+			mb->buffer_length = sizeof(LINE_TRACE_CONFIG_STRUCT);
+			mb->command = SET_TRACE_CONFIGURATION;
+    			((LINE_TRACE_CONFIG_STRUCT *)mb->data)->
+				trace_config = TRACE_INACTIVE;
+			err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+		     }		
+
+		     chdlc_priv_area->TracingEnabled = 0;
+		     chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
+		     mb->buffer_length = 0;
+		     break;
+	   
+
+		case CPIPE_GET_TRACE_INFO:
+
+		     if (!chdlc_priv_area->TracingEnabled) {
+			chdlc_udp_pkt->cblock.return_code = 1;
+			mb->buffer_length = 0;
+			break;
+		     }
+
+  		     chdlc_udp_pkt->trace_info.ismoredata = 0x00;
+		     buffer_length = 0;	/* offset of packet already occupied */
+
+		     for (frames=0; frames < chdlc_priv_area->number_trace_elements; frames++){
+
+			trace_pkt_t *trace_pkt = (trace_pkt_t *)
+				&chdlc_udp_pkt->data[buffer_length];
+
+			sdla_peek(&card->hw, chdlc_priv_area->curr_trace_addr,
+			   	  (unsigned char *)&trace_element_struct,
+			   	  sizeof(TRACE_STATUS_ELEMENT_STRUCT));
+
+     			if (trace_element_struct.opp_flag == 0x00) {
+			 	break;
+			}
+
+			/* get pointer to real data */
+			data_ptr = trace_element_struct.ptr_data_bfr;
+
+			/* See if there is actual data on the trace buffer */
+			if (data_ptr){
+				data_length = trace_element_struct.trace_length;
+			}else{
+				data_length = 0;
+				chdlc_udp_pkt->trace_info.ismoredata = 0x01;
+			}
+	
+   			if( (chdlc_priv_area->available_buffer_space - buffer_length)
+				< ( sizeof(trace_pkt_t) + data_length) ) {
+
+                            /* indicate there are more frames on board & exit */
+				chdlc_udp_pkt->trace_info.ismoredata = 0x01;
+                               	break;
+                         }
+
+			trace_pkt->status = trace_element_struct.trace_type;
+
+			trace_pkt->time_stamp =
+				trace_element_struct.trace_time_stamp;
+
+			trace_pkt->real_length =
+				trace_element_struct.trace_length;
+
+			/* see if we can fit the frame into the user buffer */
+			real_len = trace_pkt->real_length;
+
+			if (data_ptr == 0) {
+			     	trace_pkt->data_avail = 0x00;
+			} else {
+				unsigned tmp = 0;
+
+				/* get the data from circular buffer
+				    must check for end of buffer */
+			        trace_pkt->data_avail = 0x01;
+
+				if ((data_ptr + real_len) >
+					     chdlc_priv_area->end_addr_trace_buffer + 1){
+
+				    	tmp = chdlc_priv_area->end_addr_trace_buffer - data_ptr + 1;
+				    	sdla_peek(&card->hw, data_ptr,
+					       	  trace_pkt->data,tmp);
+				    	data_ptr = chdlc_priv_area->base_addr_trace_buffer;
+				}
+	
+		        	sdla_peek(&card->hw, data_ptr,
+					  &trace_pkt->data[tmp], real_len - tmp);
+			}	
+
+			/* zero the opp flag to show we got the frame */
+			ut_char = 0x00;
+			sdla_poke(&card->hw, chdlc_priv_area->curr_trace_addr, &ut_char, 1);
+
+       			/* now move onto the next frame */
+       			chdlc_priv_area->curr_trace_addr += sizeof(TRACE_STATUS_ELEMENT_STRUCT);
+
+       			/* check if we went over the last address */
+			if ( chdlc_priv_area->curr_trace_addr > chdlc_priv_area->end_trace_addr ) {
+				chdlc_priv_area->curr_trace_addr = chdlc_priv_area->start_trace_addr;
+       			}
+
+            		if(trace_pkt->data_avail == 0x01) {
+				buffer_length += real_len - 1;
+			}
+	 
+	       	    	/* for the header */
+	            	buffer_length += sizeof(trace_pkt_t);
+
+		     }  /* For Loop */
+
+		     if (frames == chdlc_priv_area->number_trace_elements){
+			chdlc_udp_pkt->trace_info.ismoredata = 0x01;
+	             }
+ 		     chdlc_udp_pkt->trace_info.num_frames = frames;
+		 
+    		     mb->buffer_length = buffer_length;
+		     chdlc_udp_pkt->cblock.buffer_length = buffer_length; 
+		 
+		     chdlc_udp_pkt->cblock.return_code = COMMAND_OK; 
+		     
+		     break;
+
+
+		case CPIPE_FT1_READ_STATUS:
+			((unsigned char *)chdlc_udp_pkt->data )[0] =
+				flags->FT1_info_struct.parallel_port_A_input;
+
+			((unsigned char *)chdlc_udp_pkt->data )[1] =
+				flags->FT1_info_struct.parallel_port_B_input;
+				 
+			chdlc_udp_pkt->cblock.return_code = COMMAND_OK;
+			mb->buffer_length = 2;
+			break;
+		
+		case CPIPE_ROUTER_UP_TIME:
+			do_gettimeofday( &tv );
+			chdlc_priv_area->router_up_time = tv.tv_sec - 
+					chdlc_priv_area->router_start_time;
+			*(unsigned long *)&chdlc_udp_pkt->data = 
+					chdlc_priv_area->router_up_time;	
+			mb->buffer_length = sizeof(unsigned long);
+			break;
+
+   		case FT1_MONITOR_STATUS_CTRL:
+			/* Enable FT1 MONITOR STATUS */
+	        	if ((chdlc_udp_pkt->data[0] & ENABLE_READ_FT1_STATUS) ||  
+				(chdlc_udp_pkt->data[0] & ENABLE_READ_FT1_OP_STATS)) {
+			
+			     	if( rCount++ != 0 ) {
+					chdlc_udp_pkt->cblock.
+					return_code = COMMAND_OK;
+					mb->buffer_length = 1;
+		  			break;
+		    	     	}
+	      		}
+
+	      		/* Disable FT1 MONITOR STATUS */
+	      		if( chdlc_udp_pkt->data[0] == 0) {
+
+	      	   	     	if( --rCount != 0) {
+		  			chdlc_udp_pkt->cblock.
+					return_code = COMMAND_OK;
+					mb->buffer_length = 1;
+		  			break;
+	   	    	     	} 
+	      		} 	
+	
+		default:
+			/* it's a board command */
+			mb->command = chdlc_udp_pkt->cblock.command;
+			mb->buffer_length = chdlc_udp_pkt->cblock.buffer_length;
+			if (mb->buffer_length) {
+				memcpy(&mb->data, (unsigned char *) chdlc_udp_pkt->
+							data, mb->buffer_length);
+	      		} 
+			/* run the command on the board */
+			err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+			if (err != COMMAND_OK) {
+				break;
+			}
+
+			/* copy the result back to our buffer */
+	         	memcpy(&chdlc_udp_pkt->cblock, mb, sizeof(cblock_t)); 
+			
+			if (mb->buffer_length) {
+	         		memcpy(&chdlc_udp_pkt->data, &mb->data, 
+								mb->buffer_length); 
+	      		}
+
+		} /* end of switch */
+     	} /* end of else */
+
+     	/* Fill UDP TTL */
+	chdlc_udp_pkt->ip_pkt.ttl = card->wandev.ttl; 
+
+     	len = reply_udp(chdlc_priv_area->udp_pkt_data, mb->buffer_length);
+	
+     	if(chdlc_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
+		if(!chdlc_send(card, chdlc_priv_area->udp_pkt_data, len)) {
+			++ card->wandev.stats.tx_packets;
+#ifdef LINUX_2_1
+			card->wandev.stats.tx_bytes += len;
+#endif
+		}
+	} else {	
+	
+		/* Pass it up the stack
+    		   Allocate socket buffer */
+		if ((new_skb = dev_alloc_skb(len)) != NULL) {
+			/* copy data into new_skb */
+
+ 	    		buf = skb_put(new_skb, len);
+  	    		memcpy(buf, chdlc_priv_area->udp_pkt_data, len);
+
+            		/* Decapsulate pkt and pass it up the protocol stack */
+	    		new_skb->protocol = htons(ETH_P_IP);
+            		new_skb->dev = dev;
+	    		new_skb->mac.raw  = new_skb->data;
+	
+			netif_rx(new_skb);
+		} else {
+	    	
+			printk(KERN_INFO "%s: no socket buffers available!\n",
+					card->devname);
+  		}
+    	}
+ 
+	chdlc_priv_area->udp_pkt_lgth = 0;
+ 	
+	return 0;
+}
+
+/*============================================================================
+ * Initialize Receive and Transmit Buffers.
+ */
+
+static void init_chdlc_tx_rx_buff( sdla_t* card, struct device *dev )
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	CHDLC_TX_STATUS_EL_CFG_STRUCT *tx_config;
+	CHDLC_RX_STATUS_EL_CFG_STRUCT *rx_config;
+	char err;
+	
+	mb->buffer_length = 0;
+	mb->command = READ_CHDLC_CONFIGURATION;
+	err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+
+	if(err != COMMAND_OK) {
+		chdlc_error(card,err,mb);
+		return;
+	}
+
+	if(card->hw.type == SDLA_S514) {
+		tx_config = (CHDLC_TX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
+                (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
+                            ptr_CHDLC_Tx_stat_el_cfg_struct));
+        	rx_config = (CHDLC_RX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
+                (((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
+                            ptr_CHDLC_Rx_stat_el_cfg_struct));
+
+       		/* Setup Head and Tails for buffers */
+        	card->u.c.txbuf_base = (void *)(card->hw.dpmbase +
+                tx_config->base_addr_Tx_status_elements);
+        	card->u.c.txbuf_last = 
+		(CHDLC_DATA_TX_STATUS_EL_STRUCT *)  
+                card->u.c.txbuf_base +
+		(tx_config->number_Tx_status_elements - 1);
+
+        	card->u.c.rxbuf_base = (void *)(card->hw.dpmbase +
+                rx_config->base_addr_Rx_status_elements);
+        	card->u.c.rxbuf_last =
+		(CHDLC_DATA_RX_STATUS_EL_STRUCT *)
+                card->u.c.rxbuf_base +
+		(rx_config->number_Rx_status_elements - 1);
+
+ 		/* Set up next pointer to be used */
+        	card->u.c.txbuf = (void *)(card->hw.dpmbase +
+                tx_config->next_Tx_status_element_to_use);
+        	card->u.c.rxmb = (void *)(card->hw.dpmbase +
+                rx_config->next_Rx_status_element_to_use);
+	}
+        else {
+                tx_config = (CHDLC_TX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
+			(((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
+			ptr_CHDLC_Tx_stat_el_cfg_struct % SDLA_WINDOWSIZE));
+
+                rx_config = (CHDLC_RX_STATUS_EL_CFG_STRUCT *)(card->hw.dpmbase +
+			(((CHDLC_CONFIGURATION_STRUCT *)mb->data)->
+			ptr_CHDLC_Rx_stat_el_cfg_struct % SDLA_WINDOWSIZE));
+
+                /* Setup Head and Tails for buffers */
+                card->u.c.txbuf_base = (void *)(card->hw.dpmbase +
+		(tx_config->base_addr_Tx_status_elements % SDLA_WINDOWSIZE));
+                card->u.c.txbuf_last =
+		(CHDLC_DATA_TX_STATUS_EL_STRUCT *)card->u.c.txbuf_base
+		+ (tx_config->number_Tx_status_elements - 1);
+                card->u.c.rxbuf_base = (void *)(card->hw.dpmbase +
+		(rx_config->base_addr_Rx_status_elements % SDLA_WINDOWSIZE));
+                card->u.c.rxbuf_last = 
+		(CHDLC_DATA_RX_STATUS_EL_STRUCT *)card->u.c.rxbuf_base
+		+ (rx_config->number_Rx_status_elements - 1);
+
+                 /* Set up next pointer to be used */
+                card->u.c.txbuf = (void *)(card->hw.dpmbase +
+		(tx_config->next_Tx_status_element_to_use % SDLA_WINDOWSIZE));
+                card->u.c.rxmb = (void *)(card->hw.dpmbase +
+		(rx_config->next_Rx_status_element_to_use % SDLA_WINDOWSIZE));
+        }
+
+        /* Setup Actual Buffer Start and end addresses */
+        card->u.c.rx_base = rx_config->base_addr_Rx_buffer;
+        card->u.c.rx_top  = rx_config->end_addr_Rx_buffer;
+
+}
+
+/*=============================================================================
+ * Perform Interrupt Test by running READ_CHDLC_CODE_VERSION command MAX_INTR
+ * _TEST_COUNTER times.
+ */
+static int intr_test( sdla_t* card, struct device *dev )
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	int err,i;
+
+	Intr_test_counter = 0;
+
+	/* The critical flag is unset because during intialization (if_open) 
+	 * we want the interrupts to be enabled so that when the wpc_isr is
+	 * called it does not exit due to critical flag set.
+	 */ 
+
+	clear_bit(1, (void*)&card->wandev.critical);
+	err = chdlc_set_intr_mode(card, APP_INT_ON_COMMAND_COMPLETE);
+
+	if (err == CMD_OK) { 
+		for (i = 0; i < MAX_INTR_TEST_COUNTER; i ++) {	
+			mb->buffer_length  = 0;
+			mb->command = READ_CHDLC_CODE_VERSION;
+			err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT;
+			if (err != CMD_OK) 
+				chdlc_error(card, err, mb);
+		}
+	}
+	else {
+		return err;
+	}
+
+	err = chdlc_set_intr_mode(card, 0);
+	set_bit(1, (void*)&card->wandev.critical);
+
+
+	if (err != CMD_OK)
+		return err;
+
+	return 0;
+}
+
+/*==============================================================================
+ * Determine what type of UDP call it is. CPIPEAB ?
+ */
+static int udp_pkt_type(struct sk_buff *skb, sdla_t* card)
+{
+	 chdlc_udp_pkt_t *chdlc_udp_pkt = (chdlc_udp_pkt_t *)skb->data;
+
+	if (!strncmp(chdlc_udp_pkt->wp_mgmt.signature,UDPMGMT_SIGNATURE,8) &&
+	   (chdlc_udp_pkt->udp_pkt.udp_dst_port == ntohs(card->wandev.udp_port)) &&
+	   (chdlc_udp_pkt->ip_pkt.protocol == UDPMGMT_UDP_PROTOCOL) &&
+	   (chdlc_udp_pkt->wp_mgmt.request_reply == UDPMGMT_REQUEST)) {
+		return UDP_CPIPE_TYPE;
+	}
+	else return UDP_INVALID_TYPE;
+}
+
+/*============================================================================
+ * Set PORT state.
+ */
+static void port_set_state (sdla_t *card, int state)
+{
+        if (card->u.c.state != state)
+        {
+                switch (state)
+                {
+                case WAN_CONNECTED:
+                        printk (KERN_INFO "%s: Link connected!\n",
+                                card->devname);
+                      break;
+
+                case WAN_CONNECTING:
+                        printk (KERN_INFO "%s: Link connecting...\n",
+                                card->devname);
+                        break;
+
+                case WAN_DISCONNECTED:
+                        printk (KERN_INFO "%s: Link disconnected!\n",
+                                card->devname);
+                        break;
+                }
+
+                card->wandev.state = card->u.c.state = state;
+        }
+}
+
+void s508_lock (sdla_t *card, unsigned long *smp_flags)
+{
+#ifdef __SMP__
+                spin_lock_irqsave(&card->lock, *smp_flags);
+                if (card->next){
+                        spin_lock(&card->next->lock);
+                }
+#else
+                disable_irq(card->hw.irq);
+#endif                                                                     
+}
+
+void s508_unlock (sdla_t *card, unsigned long *smp_flags)
+{
+#ifdef __SMP__
+                        if (card->next){
+                                spin_unlock(&card->next->lock);
+                        }
+                        spin_unlock_irqrestore(&card->lock, *smp_flags);
+#else
+                        enable_irq(card->hw.irq);
+#endif           
+}
+
+/****** End ****************************************************************/

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)