diff options
Diffstat (limited to 'drivers/net/wan/wanpipe_multppp.c')
| -rw-r--r-- | drivers/net/wan/wanpipe_multppp.c | 2357 |
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 0000000..6aa6987 --- /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 ****************************************************************/ |
