/***************************************************************************** * wanpipe_multppp.c Multi-Port PPP driver module. * * Authors: Nenad Corbic * * 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 #include #include /* printk(), and other useful stuff */ #include /* offsetof(), etc. */ #include /* return codes */ #include /* inline memset(), etc. */ #include /* kmalloc(), kfree() */ #include /* WAN router definitions */ #include /* WANPIPE common user API definitions */ #include /* ARPHRD_* defines */ #include /* sockaddr_in */ #include #include #include /* htons(), etc. */ #include #include #include /* CHDLC firmware API definitions */ #include /* CHDLC (async) API definitions */ #include /* Socket Driver common area */ #include #if defined(LINUX_2_1) || defined(LINUX_2_4) #include #include #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,3) #include #else #include "syncppp.h" #endif #else #include /* Adding new route entries */ #endif /****** 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 (wan_device_t* wandev); static int new_if (wan_device_t* wandev, netdevice_t* dev, wanif_conf_t* conf); static int del_if (wan_device_t* wandev, netdevice_t* dev); /* Network device interface */ static int if_init (netdevice_t* dev); static int if_open (netdevice_t* dev); static int if_close (netdevice_t* dev); static int if_send (struct sk_buff* skb, netdevice_t* dev); #if defined(LINUX_2_1) || defined(LINUX_2_4) static struct net_device_stats* if_stats (netdevice_t* dev); #else static struct enet_statistics* if_stats (netdevice_t* dev); #endif #ifdef LINUX_2_4 static void if_tx_timeout (netdevice_t *dev); #endif /* 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, netdevice_t *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, netdevice_t* dev, chdlc_private_area_t* chdlc_priv_area); static int process_udp_mgmt_pkt(sdla_t* card, netdevice_t* 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 (netdevice_t*); 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 (wan_device_t* wandev) { sdla_t* card = wandev->private; netdevice_t* 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 (wan_device_t* wandev, netdevice_t* pdev, wanif_conf_t* conf) { struct ppp_device *pppdev = (struct ppp_device *)pdev; netdevice_t *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 */ #ifdef LINUX_2_4 strcpy(dev->name,card->u.c.if_name); #else dev->name = (char *)kmalloc(strlen(card->u.c.if_name) + 2, GFP_KERNEL); if(dev->name == NULL) { kfree(chdlc_priv_area); return -ENOMEM; } sprintf(dev->name, "%s", card->u.c.if_name); #endif /* 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); #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,2,16) dev = pppdev->dev; #else dev = &pppdev->dev; #endif 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 (wan_device_t* wandev, netdevice_t* 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 (netdevice_t* dev) { chdlc_private_area_t* chdlc_priv_area = dev->priv; sdla_t* card = chdlc_priv_area->card; wan_device_t* wandev = &card->wandev; #ifdef LINUX_2_0 int i; #endif /* 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; #ifdef LINUX_2_4 dev->tx_timeout = &if_tx_timeout; dev->watchdog_timeo = TX_TIMEOUT; #endif #ifdef LINUX_2_0 dev->family = AF_INET; #endif /* 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; /* Initialize socket buffers */ #if !defined(LINUX_2_1) && !defined(LINUX_2_4) for (i = 0; i < DEV_NUMBUFFS; ++i) skb_queue_head_init(&dev->buffs[i]); #endif return 0; } #ifdef LINUX_2_4 /*============================================================================ * Handle transmit timeout event from netif watchdog */ static void if_tx_timeout (netdevice_t *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); } #endif /*============================================================================ * 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 (netdevice_t* 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 */ #ifdef LINUX_2_4 if (netif_running(dev)) return -EBUSY; #else if (dev->start) return -EBUSY; /* only one open is allowed */ #endif /* Start PPP Layer */ if (sppp_open(dev)){ return -EIO; } do_gettimeofday(&tv); chdlc_priv_area->router_start_time = tv.tv_sec; #ifdef LINUX_2_4 netif_start_queue(dev); #else dev->interrupt = 0; dev->tbusy = 0; dev->start = 1; #endif 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 (netdevice_t* dev) { chdlc_private_area_t* chdlc_priv_area = dev->priv; sdla_t* card = chdlc_priv_area->card; /* Stop the PPP Layer */ sppp_close(dev); stop_net_queue(dev); #ifndef LINUX_2_4 dev->start=0; #endif 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, netdevice_t* 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; #ifdef LINUX_2_4 netif_stop_queue(dev); #endif 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); wake_net_dev(dev); return 0; } #ifndef LINUX_2_4 if (dev->tbusy){ /* If our device stays busy for at least 5 seconds then we will * kick start the device by making dev->tbusy = 0. We expect * that our device never stays busy more than 5 seconds. So this * is only used as a last resort. */ ++card->wandev.stats.collisions; if((jiffies - chdlc_priv_area->tick_counter) < (5 * HZ)) { return 1; } printk (KERN_INFO "%s: Transmit (tbusy) timeout !\n", card->devname); /* unbusy the interface */ dev->tbusy = 0; } #endif 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; } start_net_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; start_net_queue(dev); goto if_send_crit_exit; } if (card->wandev.state != WAN_CONNECTED){ ++card->wandev.stats.tx_dropped; start_net_queue(dev); goto if_send_crit_exit; } if (chdlc_send(card, skb->data, skb->len)){ stop_net_queue(dev); }else{ ++card->wandev.stats.tx_packets; #if defined(LINUX_2_1) || defined(LINUX_2_4) card->wandev.stats.tx_bytes += skb->len; #endif #ifdef LINUX_2_4 dev->trans_start = jiffies; #endif start_net_queue(dev); } if_send_crit_exit: if (!(err=is_queue_stopped(dev))){ wan_dev_kfree_skb(skb, FREE_WRITE); }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 > 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. */ #if defined(LINUX_2_1) || defined(LINUX_2_4) static struct net_device_stats* if_stats (netdevice_t* 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; } #else static struct enet_statistics* if_stats (netdevice_t* dev) { sdla_t *my_card; chdlc_private_area_t* chdlc_priv_area = dev->priv; /* 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; } #endif /****** Cisco HDLC Firmware Interface Functions *******************************/ /*============================================================================ * Read firmware code version. * Put code version as ASCII string in str. */ static int chdlc_read_version (sdla_t* card, char* str) { CHDLC_MAILBOX_STRUCT* mb = card->mbox; int len; char err; mb->buffer_length = 0; mb->command = READ_CHDLC_CODE_VERSION; err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT; if(err != COMMAND_OK) { chdlc_error(card,err,mb); } else if (str) { /* is not null */ len = mb->buffer_length; memcpy(str, mb->data, len); str[len] = '\0'; } return (err); } /*----------------------------------------------------------------------------- * Configure CHDLC firmware. */ static int chdlc_configure (sdla_t* card, void* data) { int err; CHDLC_MAILBOX_STRUCT *mailbox = card->mbox; int data_length = sizeof(CHDLC_CONFIGURATION_STRUCT); mailbox->buffer_length = data_length; memcpy(mailbox->data, data, data_length); mailbox->command = SET_CHDLC_CONFIGURATION; err = sdla_exec(mailbox) ? mailbox->return_code : CMD_TIMEOUT; if (err != COMMAND_OK) chdlc_error (card, err, mailbox); return err; } /*============================================================================ * Set interrupt mode -- HDLC Version. */ static int chdlc_set_intr_mode (sdla_t* card, unsigned mode) { CHDLC_MAILBOX_STRUCT* mb = card->mbox; CHDLC_INT_TRIGGERS_STRUCT* int_data = (CHDLC_INT_TRIGGERS_STRUCT *)mb->data; int err; int_data->CHDLC_interrupt_triggers = mode; int_data->IRQ = card->hw.irq; int_data->interrupt_timer = 1; mb->buffer_length = sizeof(CHDLC_INT_TRIGGERS_STRUCT); mb->command = SET_CHDLC_INTERRUPT_TRIGGERS; err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT; if (err != COMMAND_OK) chdlc_error (card, err, mb); return err; } /*============================================================================ * Enable communications. */ static int chdlc_comm_enable (sdla_t* card) { int err; CHDLC_MAILBOX_STRUCT* mb = card->mbox; mb->buffer_length = 0; mb->command = ENABLE_CHDLC_COMMUNICATIONS; err = sdla_exec(mb) ? mb->return_code : CMD_TIMEOUT; if (err != COMMAND_OK) chdlc_error(card, err, mb); 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) { netdevice_t* 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; wake_net_dev(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) { netdevice_t *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; } #ifdef LINUX_2_4 if (!netif_running(dev)){ goto rx_exit; } #else if (!dev->start){ goto rx_exit; } #endif 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 ++; #if defined(LINUX_2_1) || defined(LINUX_2_4) card->wandev.stats.rx_bytes += skb->len; #endif udp_type = udp_pkt_type( skb, card ); if(udp_type == UDP_CPIPE_TYPE) { if(store_udp_mgmt_pkt(UDP_PKT_FRM_NETWORK, card, skb, dev, chdlc_priv_area)) { flags->interrupt_info_struct. interrupt_permission |= APP_INT_ON_TIMER; } }else{ /* Pass it up the protocol stack */ skb->dev = dev; skb->mac.raw = skb->data; netif_rx(skb); } 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) { netdevice_t* 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, netdevice_t* 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) wan_dev_kfree_skb(skb, FREE_WRITE); else wan_dev_kfree_skb(skb, FREE_READ); return(udp_pkt_stored); } /*============================================================================= * Process UDP management packet. */ static int process_udp_mgmt_pkt(sdla_t* card, netdevice_t* 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; #if defined(LINUX_2_1) || defined(LINUX_2_4) card->wandev.stats.tx_bytes += len; #endif } } else { /* Pass it up the stack Allocate socket buffer */ if ((new_skb = dev_alloc_skb(len)) != NULL) { /* copy data into new_skb */ buf = skb_put(new_skb, len); memcpy(buf, chdlc_priv_area->udp_pkt_data, len); /* Decapsulate pkt and pass it up the protocol stack */ new_skb->protocol = htons(ETH_P_IP); new_skb->dev = dev; new_skb->mac.raw = new_skb->data; netif_rx(new_skb); } else { printk(KERN_INFO "%s: no socket buffers available!\n", card->devname); } } chdlc_priv_area->udp_pkt_lgth = 0; return 0; } /*============================================================================ * Initialize Receive and Transmit Buffers. */ static void init_chdlc_tx_rx_buff( sdla_t* card, netdevice_t *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 intialization (if_open) * we want the interrupts to be enabled so that when the wpc_isr is * called it does not exit due to critical flag set. */ 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) { netdevice_t *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) { #if defined(CONFIG_SMP) || defined(LINUX_2_4) 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); } #else disable_irq(card->hw.irq); #endif } void s508_unlock (sdla_t *card, unsigned long *smp_flags) { #if defined(CONFIG_SMP) || defined(LINUX_2_4) if (card->next){ spin_unlock(&card->next->wandev.lock); } spin_unlock_irqrestore(&card->wandev.lock, *smp_flags); #else enable_irq(card->hw.irq); #endif } /*=========================================================================== * 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) { netdevice_t *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 (netdevice_t *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); } } MODULE_LICENSE("GPL"); /****** End ****************************************************************/