Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2357 insertions, 0 deletions

diff --git a/drivers/net/wan/wanpipe_multppp.c b/drivers/net/wan/wanpipe_multppp.c
new file mode 100644
index 000000000000..6aa6987d96cb
--- /dev/null
+++ b/drivers/net/wan/wanpipe_multppp.c
@@ -0,0 +1,2357 @@
+/*****************************************************************************
+* wanpipe_multppp.c Multi-Port PPP driver module.
+*
+* Authors: 	Nenad Corbic <ncorbic@sangoma.com>
+*
+* Copyright:	(c) 1995-2001 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.
+* ============================================================================
+* Dec 15 2000   Updated for 2.4.X kernel
+* Nov 15 2000   Fixed the SyncPPP support for kernels 2.2.16 and higher.
+*   		The pppstruct has changed.
+* Jul 13 2000	Using the kernel Syncppp module on top of RAW Wanpipe CHDLC
+*  		module.
+*****************************************************************************/
+
+#include <linux/module.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/slab.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/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 */
+#include <linux/sdla_asy.h>           	/* CHDLC (async) API definitions */
+
+#include <linux/if_wanpipe_common.h>    /* Socket Driver common area */
+#include <linux/if_wanpipe.h>		
+
+
+#include <linux/inetdevice.h>
+#include <asm/uaccess.h>
+
+#include <net/syncppp.h>
+
+
+/****** 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   	0x01
+#define TMR_INT_ENABLED_UPDATE	0x02
+#define TMR_INT_ENABLED_CONFIG  0x04
+ 
+#define	CHDLC_DFLT_DATA_LEN	1500		/* default MTU */
+#define CHDLC_HDR_LEN		1
+
+#define IFF_POINTTOPOINT 0x10
+
+#define CHDLC_API 0x01
+
+#define PORT(x)   (x == 0 ? "PRIMARY" : "SECONDARY" )
+#define MAX_BH_BUFF	10
+
+#define CRC_LENGTH 	2 
+#define PPP_HEADER_LEN 	4
+ 
+/******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
+{
+	void *if_ptr;				/* General Pointer used by SPPP */
+	wanpipe_common_t common;
+	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(struct wan_device* wandev);
+static int new_if(struct wan_device* wandev, struct net_device* dev,
+		  wanif_conf_t* conf);
+static int del_if(struct wan_device* wandev, struct net_device* dev);
+
+/* Network device interface */
+static int if_init(struct net_device* dev);
+static int if_open(struct net_device* dev);
+static int if_close(struct net_device* dev);
+static int if_send(struct sk_buff* skb, struct net_device* dev);
+static struct net_device_stats* if_stats(struct net_device* dev);
+
+static void if_tx_timeout(struct net_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);
+static int config_chdlc (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 net_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 void port_set_state (sdla_t *card, int);
+
+/* Interrupt handlers */
+static void wsppp_isr (sdla_t* card);
+static void rx_intr (sdla_t* card);
+static void timer_intr(sdla_t *);
+
+/* Miscellaneous functions */
+static int reply_udp( unsigned char *data, unsigned int mbox_len );
+static int intr_test( sdla_t* card);
+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 net_device* dev,
+			      chdlc_private_area_t* chdlc_priv_area);
+static int process_udp_mgmt_pkt(sdla_t* card, struct net_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 void send_ppp_term_request(struct net_device *dev);
+
+
+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 wsppp_init (sdla_t* card, wandev_conf_t* conf)
+{
+	unsigned char port_num;
+	int err;
+	unsigned long max_permitted_baud = 0;
+	SHARED_MEMORY_INFO_STRUCT *flags;
+
+	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_MPPP) {
+		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 Raw CHDLC firmware v%s\n" 
+			 "%s: for Multi-Port PPP protocol.\n",
+			card->devname,u.str,card->devname); 
+
+	card->isr			= &wsppp_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.udp_port   	= conf->udp_port;
+
+	card->wandev.new_if_cnt = 0;
+
+	/* 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) || card->u.c.receive_only) {
+			/* 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) || card->u.c.receive_only) {
+
+		/* For Primary Port 0 */
+		card->wandev.mtu =
+			(conf->mtu >= MIN_LGTH_CHDLC_DATA_CFG) ?
+			min_t(unsigned int, 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_t(unsigned int, conf->mtu, SEC_MAX_NO_DATA_BYTES_IN_FRAME) :
+			CHDLC_DFLT_DATA_LEN;
+	}
+
+	/* Add on a PPP Header */
+	card->wandev.mtu += PPP_HEADER_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));
+	}
+	
+	flags = card->u.c.flags;
+	
+	/* This is for the ports link state */
+	card->wandev.state = WAN_DUALPORT;
+	card->u.c.state = WAN_DISCONNECTED;
+
+
+	if (!card->wandev.piggyback){
+		err = intr_test(card);
+
+		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);
+			return  -EIO;
+		}
+			
+		printk(KERN_INFO "%s: Interrupt test passed (%i)\n", 
+				card->devname, Intr_test_counter);
+	}
+
+
+	if (chdlc_set_intr_mode(card, APP_INT_ON_TIMER)){
+		printk (KERN_INFO "%s: Failed to set interrupt triggers!\n",
+				card->devname);
+		return -EIO;	
+        }
+	
+	/* Mask the Timer interrupt */
+	flags->interrupt_info_struct.interrupt_permission &= 
+		~APP_INT_ON_TIMER;
+
+	printk(KERN_INFO "\n");
+
+	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(struct wan_device* wandev)
+{
+	sdla_t* card = wandev->private;
+ 	struct net_device* dev;
+        volatile chdlc_private_area_t* chdlc_priv_area;
+        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((dev=card->wandev.dev) == NULL)
+		return -ENODEV;
+
+	if((chdlc_priv_area=dev->priv) == NULL)
+		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(struct wan_device* wandev, struct net_device* pdev,
+		  wanif_conf_t* conf)
+{
+
+	struct ppp_device *pppdev = (struct ppp_device *)pdev;
+	struct net_device *dev = NULL;
+	struct sppp *sp;
+	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;
+
+	//We don't need this any more
+	chdlc_priv_area->route_status = NO_ROUTE;
+	chdlc_priv_area->route_removed = 0;
+
+	printk(KERN_INFO "%s: Firmware running in HDLC STREAMING Mode\n",
+		wandev->name);
+	
+	/* Setup wanpipe as a router (WANPIPE) or as an API */
+	if( strcmp(conf->usedby, "WANPIPE") == 0) {
+		printk(KERN_INFO "%s: Driver running in WANPIPE mode!\n",
+			wandev->name);
+		card->u.c.usedby = WANPIPE;
+	} else {
+		printk(KERN_INFO 
+			"%s: API Mode is not supported for SyncPPP!\n",
+			wandev->name);
+		kfree(chdlc_priv_area);
+		return -EINVAL;
+	}
+
+	/* Get Multicast Information */
+	chdlc_priv_area->mc = conf->mc;
+
+
+	chdlc_priv_area->if_ptr = pppdev;
+
+	/* prepare network device data space for registration */
+
+	strcpy(dev->name,card->u.c.if_name);
+
+	/* Attach PPP protocol layer to pppdev
+	 * The sppp_attach() will initilize the dev structure
+         * and setup ppp layer protocols.
+         * All we have to do is to bind in:
+         *        if_open(), if_close(), if_send() and get_stats() functions.
+         */
+	sppp_attach(pppdev);
+	dev = pppdev->dev;
+	sp = &pppdev->sppp;
+	
+	/* Enable PPP Debugging */
+	// FIXME Fix this up somehow
+	//sp->pp_flags |= PP_DEBUG; 	
+	sp->pp_flags &= ~PP_CISCO;
+
+	dev->init = &if_init;
+	dev->priv = chdlc_priv_area;
+	
+	return 0;
+}
+
+
+
+
+/*============================================================================
+ * Delete logical channel.
+ */
+static int del_if(struct wan_device* wandev, struct net_device* dev)
+{
+	chdlc_private_area_t *chdlc_priv_area = dev->priv;
+	sdla_t *card = chdlc_priv_area->card;
+	unsigned long smp_lock;
+	
+	/* Detach the PPP layer */
+	printk(KERN_INFO "%s: Detaching SyncPPP Module from %s\n",
+			wandev->name,dev->name);
+
+	lock_adapter_irq(&wandev->lock,&smp_lock);
+
+	sppp_detach(dev);
+	chdlc_priv_area->if_ptr=NULL;
+	
+	chdlc_set_intr_mode(card, 0);
+	if (card->u.c.comm_enabled)
+		chdlc_comm_disable(card);
+	unlock_adapter_irq(&wandev->lock,&smp_lock);
+	
+	port_set_state(card, WAN_DISCONNECTED);
+
+	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 net_device* dev)
+{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+	struct wan_device* wandev = &card->wandev;
+	
+	/* NOTE: Most of the dev initialization was
+         *       done in sppp_attach(), called by new_if() 
+         *       function. All we have to do here is
+         *       to link four major routines below. 
+         */
+
+	/* Initialize device driver entry points */
+	dev->open		= &if_open;
+	dev->stop		= &if_close;
+	dev->hard_start_xmit	= &if_send;
+	dev->get_stats		= &if_stats;
+	dev->tx_timeout		= &if_tx_timeout;
+	dev->watchdog_timeo	= TX_TIMEOUT;
+
+
+	/* 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 we over fill this queue the packets will
+         * be droped by the kernel.
+         * sppp_attach() sets this to 10, but
+         * 100 will give us more room at low speeds.
+	 */
+        dev->tx_queue_len = 100;
+   
+	return 0;
+}
+
+
+/*============================================================================
+ * Handle transmit timeout event from netif watchdog
+ */
+static void if_tx_timeout(struct net_device *dev)
+{
+    	chdlc_private_area_t* chan = dev->priv;
+	sdla_t *card = chan->card;
+	
+	/* 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;
+
+	printk (KERN_INFO "%s: Transmit timed out on %s\n", card->devname,dev->name);
+	netif_wake_queue (dev);
+}
+
+
+/*============================================================================
+ * 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 net_device* dev)
+{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+	struct timeval tv;
+	SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
+
+	/* Only one open per interface is allowed */
+	if (netif_running(dev))
+		return -EBUSY;
+
+	/* Start PPP Layer */
+	if (sppp_open(dev)){
+		return -EIO;
+	}
+
+	do_gettimeofday(&tv);
+	chdlc_priv_area->router_start_time = tv.tv_sec;
+ 
+	netif_start_queue(dev);
+	
+	wanpipe_open(card);
+
+	chdlc_priv_area->timer_int_enabled |= TMR_INT_ENABLED_CONFIG;
+	flags->interrupt_info_struct.interrupt_permission |= APP_INT_ON_TIMER;
+	return 0;
+}
+
+/*============================================================================
+ * Close network interface.
+ * o if this is the last close, then disable communications and interrupts.
+ * o reset flags.
+ */
+static int if_close(struct net_device* dev)
+{
+	chdlc_private_area_t* chdlc_priv_area = dev->priv;
+	sdla_t* card = chdlc_priv_area->card;
+
+	/* Stop the PPP Layer */
+	sppp_close(dev);
+	netif_stop_queue(dev);
+
+	wanpipe_close(card);
+	
+	return 0;
+}
+
+/*============================================================================
+ * 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 net_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;
+	int err=0;
+
+	netif_stop_queue(dev);
+
+	
+	if (skb == NULL){
+		/* If we get here, some higher layer thinks we've missed an
+		 * tx-done interrupt.
+		 */
+		printk(KERN_INFO "%s: Received NULL skb buffer! interface %s got kicked!\n",
+			card->devname, dev->name);
+
+		netif_wake_queue(dev);
+		return 0;
+	}
+
+   	if (ntohs(skb->protocol) != htons(PVC_PROT)){
+		/* 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;
+			}
+			netif_start_queue(dev);
+			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(SEND_CRIT, (void*)&card->wandev.critical)){
+	
+		printk(KERN_INFO "%s: Critical in if_send: %lx\n",
+					card->wandev.name,card->wandev.critical);
+                ++card->wandev.stats.tx_dropped;
+		netif_start_queue(dev);
+		goto if_send_crit_exit;
+	}
+
+	if (card->wandev.state != WAN_CONNECTED){
+		++card->wandev.stats.tx_dropped;
+		netif_start_queue(dev);
+		goto if_send_crit_exit;
+	}
+	
+	if (chdlc_send(card, skb->data, skb->len)){
+		netif_stop_queue(dev);
+
+	}else{
+		++card->wandev.stats.tx_packets;
+       		card->wandev.stats.tx_bytes += skb->len;
+		dev->trans_start = jiffies;
+		netif_start_queue(dev);
+	}	
+
+if_send_crit_exit:
+	if (!(err=netif_queue_stopped(dev))){
+                dev_kfree_skb_any(skb);
+	}else{
+		chdlc_priv_area->tick_counter = jiffies;
+		chdlc_int->interrupt_permission |= APP_INT_ON_TX_FRAME;
+	}
+
+	clear_bit(SEND_CRIT, (void*)&card->wandev.critical);
+	if(card->hw.type != SDLA_S514){
+		s508_unlock(card,&smp_flags);
+	}
+
+	return err;
+}
+
+
+/*============================================================================
+ * 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.
+ */
+static struct net_device_stats* if_stats(struct net_device* dev)
+{
+	sdla_t *my_card;
+	chdlc_private_area_t* chdlc_priv_area;
+
+	/* Shutdown bug fix. In del_if() we kill
+         * dev->priv pointer. This function, gets
+         * called after del_if(), thus check
+         * if pointer has been deleted */
+	if ((chdlc_priv_area=dev->priv) == NULL)
+		return NULL;
+
+	my_card = chdlc_priv_area->card;
+	return &my_card->wandev.stats; 
+}
+
+
+/****** 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);
+	else
+		card->u.c.comm_enabled=1;
+
+	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);
+
+	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 wsppp_isr (sdla_t* card)
+{
+	struct net_device* dev;
+	SHARED_MEMORY_INFO_STRUCT* flags = NULL;
+	int i;
+	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;
+				card->isr(card);
+				return;
+			}
+		}
+	}
+
+	dev = card->wandev.dev;
+	card->in_isr = 1;
+	flags = card->u.c.flags;
+		
+	/* If we get an interrupt with no network device, stop the interrupts
+	 * and issue an error */
+	if ((!dev || !dev->priv) && flags->interrupt_info_struct.interrupt_type != 
+	    	COMMAND_COMPLETE_APP_INT_PEND){
+		goto isr_done;
+	}
+
+	
+	/* if critical due to peripheral operations
+	 * ie. update() or getstats() then reset the interrupt and
+	 * wait for the board to retrigger.
+	 */
+	if(test_bit(PERI_CRIT, (void*)&card->wandev.critical)) {
+		flags->interrupt_info_struct.
+					interrupt_type = 0;
+		goto isr_done;
+	}
+
+
+	/* On a 508 Card, if critical due to if_send 
+         * Major Error !!!
+	 */
+	if(card->hw.type != SDLA_S514) {
+		if(test_bit(0, (void*)&card->wandev.critical)) {
+			printk(KERN_INFO "%s: Critical while in ISR: %lx\n",
+				card->devname, card->wandev.critical);
+			goto isr_done;
+		}
+	}
+
+	switch(flags->interrupt_info_struct.interrupt_type) {
+
+		case RX_APP_INT_PEND:	/* 0x01: receive interrupt */
+			rx_intr(card);
+			break;
+
+		case TX_APP_INT_PEND:	/* 0x02: transmit interrupt */
+			flags->interrupt_info_struct.interrupt_permission &=
+				 ~APP_INT_ON_TX_FRAME;
+
+			netif_wake_queue(dev);
+			break;
+
+		case COMMAND_COMPLETE_APP_INT_PEND:/* 0x04: cmd cplt */
+			++ Intr_test_counter;
+			break;
+
+		case CHDLC_EXCEP_COND_APP_INT_PEND:	/* 0x20 */
+			process_chdlc_exception(card);
+			break;
+
+		case GLOBAL_EXCEP_COND_APP_INT_PEND:
+			process_global_exception(card);
+			break;
+
+		case TIMER_APP_INT_PEND:
+			timer_intr(card);
+			break;
+
+		default:
+			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");	
+			break;
+	}
+
+isr_done:
+	card->in_isr = 0;
+	flags->interrupt_info_struct.interrupt_type = 0;
+}
+
+/*============================================================================
+ * Receive interrupt handler.
+ */
+static void rx_intr (sdla_t* card)
+{
+	struct net_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;
+	unsigned addr = rxbuf->ptr_data_bfr;
+	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");
+
+
+		/* Bug Fix: Mar 6 2000
+                 * If we get a corrupted mailbox, it measn that driver 
+                 * is out of sync with the firmware. There is no recovery.
+                 * If we don't turn off all interrupts for this card
+                 * the machine will crash. 
+                 */
+		printk(KERN_INFO "%s: Critical router failure ...!!!\n", card->devname);
+		printk(KERN_INFO "Please contact Sangoma Technologies !\n");
+		chdlc_set_intr_mode(card,0);	
+		return;
+	}
+
+	dev = card->wandev.dev;
+
+	if (!dev){ 
+		goto rx_exit;
+	}
+	
+	if (!netif_running(dev)){
+		goto rx_exit;
+	}
+
+	chdlc_priv_area = dev->priv;
+
+	if (rxbuf->error_flag){	
+		goto rx_exit;
+	}
+	/* Take off two CRC bytes */
+
+	if (rxbuf->frame_length < 7 || rxbuf->frame_length > 1506 ){
+		goto rx_exit;
+	}	
+
+	len = rxbuf->frame_length - CRC_LENGTH;
+
+	/* Allocate socket buffer */
+	skb = dev_alloc_skb(len);
+
+	if (skb == NULL) {
+		if (net_ratelimit()){
+			printk(KERN_INFO "%s: no socket buffers available!\n",
+						card->devname);
+		}
+		++card->wandev.stats.rx_dropped;
+		goto rx_exit;
+	}
+
+	/* Copy data to the socket buffer */
+	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);
+
+	skb->protocol = htons(ETH_P_WAN_PPP);
+
+	card->wandev.stats.rx_packets ++;
+	card->wandev.stats.rx_bytes += skb->len;
+	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{
+               	/* Pass it up the protocol stack */
+                skb->dev = dev;
+                skb->mac.raw  = skb->data;
+                netif_rx(skb);
+                dev->last_rx = jiffies;
+	}
+
+rx_exit:
+	/* 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 net_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;
+
+	if (chdlc_priv_area->timer_int_enabled & TMR_INT_ENABLED_CONFIG) {
+		if (!config_chdlc(card)){
+			chdlc_priv_area->timer_int_enabled &= ~TMR_INT_ENABLED_CONFIG;
+		}
+	}
+	
+	/* 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)
+{
+
+	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;
+	//API OPTIONS
+	cfg.CHDLC_API_options		= DISCARD_RX_ERROR_FRAMES;
+	cfg.modem_status_timer		= 100;
+	cfg.CHDLC_protocol_options	= HDLC_STREAMING_MODE;
+	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	= 0;
+	cfg.receive_keepalive_timer	= 0;
+	cfg.keepalive_error_tolerance	= 0;
+	cfg.SLARP_request_timer		= 0;
+
+	cfg.IP_address		= 0;
+	cfg.IP_netmask		= 0;
+	
+	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;
+			}
+
+			if (!(mbox->data[0] & DCD_HIGH) || !(mbox->data[0] & DCD_HIGH)){
+				//printk(KERN_INFO "Sending TERM Request Manually !\n");
+				send_ppp_term_request(card->wandev.dev);
+			}	
+			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);
+			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;
+		default:
+			printk(KERN_INFO "%s: Exception Condition %x!\n",
+					card->devname,err);
+			break;
+		}
+
+	}
+	return 0;
+}
+
+
+/*=============================================================================
+ * 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 net_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;
+	}
+
+	if(udp_pkt_src == UDP_PKT_FRM_STACK)
+		dev_kfree_skb_any(skb);
+	else
+                dev_kfree_skb_any(skb);
+	
+	return(udp_pkt_stored);
+}
+
+
+/*=============================================================================
+ * Process UDP management packet.
+ */
+
+static int process_udp_mgmt_pkt(sdla_t* card, struct net_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;
+
+	if(chdlc_priv_area->udp_pkt_src == UDP_PKT_FRM_NETWORK) {
+
+		switch(chdlc_udp_pkt->cblock.command) {
+			case READ_GLOBAL_STATISTICS:
+			case READ_MODEM_STATUS:  
+			case READ_CHDLC_LINK_STATUS:
+			case CPIPE_ROUTER_UP_TIME:
+			case READ_COMMS_ERROR_STATS:
+			case READ_CHDLC_OPERATIONAL_STATS:
+
+			/* These two commands are executed for
+			 * each request */
+			case READ_CHDLC_CONFIGURATION:
+			case READ_CHDLC_CODE_VERSION:
+				udp_mgmt_req_valid = 1;
+				break;
+			default:
+				udp_mgmt_req_valid = 0;
+				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;
+
+		if (net_ratelimit()){	
+			printk(KERN_INFO 
+			"%s: Warning, Illegal UDP command attempted from network: %x\n",
+			card->devname,chdlc_udp_pkt->cblock.command);
+		}
+
+   	} 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;
+			card->wandev.stats.tx_bytes += len;
+		}
+	} 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);
+			dev->last_rx = jiffies;
+		} 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 net_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)
+{
+	CHDLC_MAILBOX_STRUCT* mb = card->mbox;
+	int err,i;
+
+	Intr_test_counter = 0;
+
+	/* The critical flag is unset because during initialization (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.
+	 */ 
+
+	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;
+		}
+	}
+	else {
+		return err;
+	}
+
+	err = chdlc_set_intr_mode(card, 0);
+
+	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)
+{
+	struct net_device *dev = card->wandev.dev;
+	chdlc_private_area_t *chdlc_priv_area = dev->priv;
+
+        if (card->u.c.state != state)
+        {
+                switch (state)
+                {
+                case WAN_CONNECTED:
+                        printk (KERN_INFO "%s: HDLC link connected!\n",
+                                card->devname);
+                      break;
+
+                case WAN_CONNECTING:
+                        printk (KERN_INFO "%s: HDLC link connecting...\n",
+                                card->devname);
+                        break;
+
+                case WAN_DISCONNECTED:
+                        printk (KERN_INFO "%s: HDLC link disconnected!\n",
+                                card->devname);
+                        break;
+                }
+
+                card->wandev.state = card->u.c.state = state;
+		chdlc_priv_area->common.state = state;
+        }
+}
+
+void s508_lock (sdla_t *card, unsigned long *smp_flags)
+{
+	spin_lock_irqsave(&card->wandev.lock, *smp_flags);
+        if (card->next){
+		/* It is ok to use spin_lock here, since we
+		 * already turned off interrupts */
+        	spin_lock(&card->next->wandev.lock);
+	}
+}
+
+void s508_unlock (sdla_t *card, unsigned long *smp_flags)
+{
+	if (card->next){
+		spin_unlock(&card->next->wandev.lock);
+	}
+	spin_unlock_irqrestore(&card->wandev.lock, *smp_flags);
+}
+
+
+
+/*===========================================================================
+ * config_chdlc
+ *
+ *	Configure the chdlc protocol and enable communications.		
+ *
+ *   	The if_open() function binds this function to the poll routine.
+ *      Therefore, this function will run every time the chdlc interface
+ *      is brought up. We cannot run this function from the if_open 
+ *      because if_open does not have access to the remote IP address.
+ *      
+ *	If the communications are not enabled, proceed to configure
+ *      the card and enable communications.
+ *
+ *      If the communications are enabled, it means that the interface
+ *      was shutdown by ether the user or driver. In this case, we 
+ *      have to check that the IP addresses have not changed.  If
+ *      the IP addresses have changed, we have to reconfigure the firmware
+ *      and update the changed IP addresses.  Otherwise, just exit.
+ *
+ */
+
+static int config_chdlc (sdla_t *card)
+{
+	struct net_device *dev = card->wandev.dev;
+	SHARED_MEMORY_INFO_STRUCT *flags = card->u.c.flags;
+
+	if (card->u.c.comm_enabled){
+		chdlc_comm_disable(card);
+		port_set_state(card, WAN_DISCONNECTED);
+	}
+
+	if (set_chdlc_config(card)) {
+		printk(KERN_INFO "%s: CHDLC Configuration Failed!\n",
+				card->devname);
+		return 0;
+	}
+	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)){
+		printk (KERN_INFO "%s: Failed to set interrupt triggers!\n",
+				card->devname);
+		return 0;	
+        }
+	
+
+	/* Mask the Transmit and Timer interrupt */
+	flags->interrupt_info_struct.interrupt_permission &= 
+		~(APP_INT_ON_TX_FRAME | APP_INT_ON_TIMER);
+
+
+	if (chdlc_comm_enable(card) != 0) {
+		printk(KERN_INFO "%s: Failed to enable chdlc communications!\n",
+				card->devname);
+		flags->interrupt_info_struct.interrupt_permission = 0;
+		card->u.c.comm_enabled=0;
+		chdlc_set_intr_mode(card,0);
+		return 0;
+	}
+
+	/* Initialize Rx/Tx buffer control fields */
+	port_set_state(card, WAN_CONNECTING);
+	return 0; 
+}
+
+
+static void send_ppp_term_request(struct net_device *dev)
+{
+	struct sk_buff *new_skb;
+	unsigned char *buf;
+
+	if ((new_skb = dev_alloc_skb(8)) != NULL) {
+		/* copy data into new_skb */
+
+		buf = skb_put(new_skb, 8);
+		sprintf(buf,"%c%c%c%c%c%c%c%c", 0xFF,0x03,0xC0,0x21,0x05,0x98,0x00,0x07);
+
+		/* Decapsulate pkt and pass it up the protocol stack */
+		new_skb->protocol = htons(ETH_P_WAN_PPP);
+		new_skb->dev = dev;
+		new_skb->mac.raw  = new_skb->data;
+
+		netif_rx(new_skb);
+		dev->last_rx = jiffies;
+	}
+}
+
+
+MODULE_LICENSE("GPL");
+
+/****** End ****************************************************************/