diff options
Diffstat (limited to 'drivers/net/wan/cycx_x25.c')
| -rw-r--r-- | drivers/net/wan/cycx_x25.c | 1609 |
1 files changed, 1609 insertions, 0 deletions
diff --git a/drivers/net/wan/cycx_x25.c b/drivers/net/wan/cycx_x25.c new file mode 100644 index 00000000000..5b48cd8568f --- /dev/null +++ b/drivers/net/wan/cycx_x25.c @@ -0,0 +1,1609 @@ +/* +* cycx_x25.c Cyclom 2X WAN Link Driver. X.25 module. +* +* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br> +* +* Copyright: (c) 1998-2003 Arnaldo Carvalho de Melo +* +* Based on sdla_x25.c by Gene Kozin <genek@compuserve.com> +* +* 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. +* ============================================================================ +* 2001/01/12 acme use dev_kfree_skb_irq on interrupt context +* 2000/04/02 acme dprintk, cycx_debug +* fixed the bug introduced in get_dev_by_lcn and +* get_dev_by_dte_addr by the anonymous hacker +* that converted this driver to softnet +* 2000/01/08 acme cleanup +* 1999/10/27 acme use ARPHRD_HWX25 so that the X.25 stack know +* that we have a X.25 stack implemented in +* firmware onboard +* 1999/10/18 acme support for X.25 sockets in if_send, +* beware: socket(AF_X25...) IS WORK IN PROGRESS, +* TCP/IP over X.25 via wanrouter not affected, +* working. +* 1999/10/09 acme chan_disc renamed to chan_disconnect, +* began adding support for X.25 sockets: +* conf->protocol in new_if +* 1999/10/05 acme fixed return E... to return -E... +* 1999/08/10 acme serialized access to the card thru a spinlock +* in x25_exec +* 1999/08/09 acme removed per channel spinlocks +* removed references to enable_tx_int +* 1999/05/28 acme fixed nibble_to_byte, ackvc now properly treated +* if_send simplified +* 1999/05/25 acme fixed t1, t2, t21 & t23 configuration +* use spinlocks instead of cli/sti in some points +* 1999/05/24 acme finished the x25_get_stat function +* 1999/05/23 acme dev->type = ARPHRD_X25 (tcpdump only works, +* AFAIT, with ARPHRD_ETHER). This seems to be +* needed to use socket(AF_X25)... +* Now the config file must specify a peer media +* address for svc channels over a crossover cable. +* Removed hold_timeout from x25_channel_t, +* not used. +* A little enhancement in the DEBUG processing +* 1999/05/22 acme go to DISCONNECTED in disconnect_confirm_intr, +* instead of chan_disc. +* 1999/05/16 marcelo fixed timer initialization in SVCs +* 1999/01/05 acme x25_configure now get (most of) all +* parameters... +* 1999/01/05 acme pktlen now (correctly) uses log2 (value +* configured) +* 1999/01/03 acme judicious use of data types (u8, u16, u32, etc) +* 1999/01/03 acme cyx_isr: reset dpmbase to acknowledge +* indication (interrupt from cyclom 2x) +* 1999/01/02 acme cyx_isr: first hackings... +* 1999/01/0203 acme when initializing an array don't give less +* elements than declared... +* example: char send_cmd[6] = "?\xFF\x10"; +* you'll gonna lose a couple hours, 'cause your +* brain won't admit that there's an error in the +* above declaration... the side effect is that +* memset is put into the unresolved symbols +* instead of using the inline memset functions... +* 1999/01/02 acme began chan_connect, chan_send, x25_send +* 1998/12/31 acme x25_configure +* this code can be compiled as non module +* 1998/12/27 acme code cleanup +* IPX code wiped out! let's decrease code +* complexity for now, remember: I'm learning! :) +* bps_to_speed_code OK +* 1998/12/26 acme Minimal debug code cleanup +* 1998/08/08 acme Initial version. +*/ + +#define CYCLOMX_X25_DEBUG 1 + +#include <linux/errno.h> /* return codes */ +#include <linux/if_arp.h> /* ARPHRD_HWX25 */ +#include <linux/kernel.h> /* printk(), and other useful stuff */ +#include <linux/module.h> +#include <linux/string.h> /* inline memset(), etc. */ +#include <linux/slab.h> /* kmalloc(), kfree() */ +#include <linux/stddef.h> /* offsetof(), etc. */ +#include <linux/wanrouter.h> /* WAN router definitions */ + +#include <asm/byteorder.h> /* htons(), etc. */ + +#include <linux/cyclomx.h> /* Cyclom 2X common user API definitions */ +#include <linux/cycx_x25.h> /* X.25 firmware API definitions */ + +#include <net/x25device.h> + +/* Defines & Macros */ +#define CYCX_X25_MAX_CMD_RETRY 5 +#define CYCX_X25_CHAN_MTU 2048 /* unfragmented logical channel MTU */ + +/* Data Structures */ +/* This is an extension of the 'struct net_device' we create for each network + interface to keep the rest of X.25 channel-specific data. */ +struct cycx_x25_channel { + /* This member must be first. */ + struct net_device *slave; /* WAN slave */ + + char name[WAN_IFNAME_SZ+1]; /* interface name, ASCIIZ */ + char addr[WAN_ADDRESS_SZ+1]; /* media address, ASCIIZ */ + char *local_addr; /* local media address, ASCIIZ - + svc thru crossover cable */ + s16 lcn; /* logical channel number/conn.req.key*/ + u8 link; + struct timer_list timer; /* timer used for svc channel disc. */ + u16 protocol; /* ethertype, 0 - multiplexed */ + u8 svc; /* 0 - permanent, 1 - switched */ + u8 state; /* channel state */ + u8 drop_sequence; /* mark sequence for dropping */ + u32 idle_tmout; /* sec, before disconnecting */ + struct sk_buff *rx_skb; /* receive socket buffer */ + struct cycx_device *card; /* -> owner */ + struct net_device_stats ifstats;/* interface statistics */ +}; + +/* Function Prototypes */ +/* WAN link driver entry points. These are called by the WAN router module. */ +static int cycx_wan_update(struct wan_device *wandev), + cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev, + wanif_conf_t *conf), + cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev); + +/* Network device interface */ +static int cycx_netdevice_init(struct net_device *dev), + cycx_netdevice_open(struct net_device *dev), + cycx_netdevice_stop(struct net_device *dev), + cycx_netdevice_hard_header(struct sk_buff *skb, + struct net_device *dev, u16 type, + void *daddr, void *saddr, unsigned len), + cycx_netdevice_rebuild_header(struct sk_buff *skb), + cycx_netdevice_hard_start_xmit(struct sk_buff *skb, + struct net_device *dev); + +static struct net_device_stats * + cycx_netdevice_get_stats(struct net_device *dev); + +/* Interrupt handlers */ +static void cycx_x25_irq_handler(struct cycx_device *card), + cycx_x25_irq_tx(struct cycx_device *card, struct cycx_x25_cmd *cmd), + cycx_x25_irq_rx(struct cycx_device *card, struct cycx_x25_cmd *cmd), + cycx_x25_irq_log(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_stat(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_connect_confirm(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_disconnect_confirm(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_connect(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_disconnect(struct cycx_device *card, + struct cycx_x25_cmd *cmd), + cycx_x25_irq_spurious(struct cycx_device *card, + struct cycx_x25_cmd *cmd); + +/* X.25 firmware interface functions */ +static int cycx_x25_configure(struct cycx_device *card, + struct cycx_x25_config *conf), + cycx_x25_get_stats(struct cycx_device *card), + cycx_x25_send(struct cycx_device *card, u8 link, u8 lcn, u8 bitm, + int len, void *buf), + cycx_x25_connect_response(struct cycx_device *card, + struct cycx_x25_channel *chan), + cycx_x25_disconnect_response(struct cycx_device *card, u8 link, + u8 lcn); + +/* channel functions */ +static int cycx_x25_chan_connect(struct net_device *dev), + cycx_x25_chan_send(struct net_device *dev, struct sk_buff *skb); + +static void cycx_x25_chan_disconnect(struct net_device *dev), + cycx_x25_chan_send_event(struct net_device *dev, u8 event); + +/* Miscellaneous functions */ +static void cycx_x25_set_chan_state(struct net_device *dev, u8 state), + cycx_x25_chan_timer(unsigned long d); + +static void nibble_to_byte(u8 *s, u8 *d, u8 len, u8 nibble), + reset_timer(struct net_device *dev); + +static u8 bps_to_speed_code(u32 bps); +static u8 cycx_log2(u32 n); + +static unsigned dec_to_uint(u8 *str, int len); + +static struct net_device *cycx_x25_get_dev_by_lcn(struct wan_device *wandev, + s16 lcn); +static struct net_device * + cycx_x25_get_dev_by_dte_addr(struct wan_device *wandev, char *dte); + +#ifdef CYCLOMX_X25_DEBUG +static void hex_dump(char *msg, unsigned char *p, int len); +static void cycx_x25_dump_config(struct cycx_x25_config *conf); +static void cycx_x25_dump_stats(struct cycx_x25_stats *stats); +static void cycx_x25_dump_devs(struct wan_device *wandev); +#else +#define hex_dump(msg, p, len) +#define cycx_x25_dump_config(conf) +#define cycx_x25_dump_stats(stats) +#define cycx_x25_dump_devs(wandev) +#endif +/* Public Functions */ + +/* X.25 Protocol Initialization routine. + * + * This routine is called by the main Cyclom 2X module during setup. At this + * point adapter is completely initialized and X.25 firmware is running. + * o configure adapter + * o initialize protocol-specific fields of the adapter data space. + * + * Return: 0 o.k. + * < 0 failure. */ +int cycx_x25_wan_init(struct cycx_device *card, wandev_conf_t *conf) +{ + struct cycx_x25_config cfg; + + /* Verify configuration ID */ + if (conf->config_id != WANCONFIG_X25) { + printk(KERN_INFO "%s: invalid configuration ID %u!\n", + card->devname, conf->config_id); + return -EINVAL; + } + + /* Initialize protocol-specific fields */ + card->mbox = card->hw.dpmbase + X25_MBOX_OFFS; + card->u.x.connection_keys = 0; + spin_lock_init(&card->u.x.lock); + + /* Configure adapter. Here we set reasonable defaults, then parse + * device configuration structure and set configuration options. + * Most configuration options are verified and corrected (if + * necessary) since we can't rely on the adapter to do so and don't + * want it to fail either. */ + memset(&cfg, 0, sizeof(cfg)); + cfg.link = 0; + cfg.clock = conf->clocking == WANOPT_EXTERNAL ? 8 : 55; + cfg.speed = bps_to_speed_code(conf->bps); + cfg.n3win = 7; + cfg.n2win = 2; + cfg.n2 = 5; + cfg.nvc = 1; + cfg.npvc = 1; + cfg.flags = 0x02; /* default = V35 */ + cfg.t1 = 10; /* line carrier timeout */ + cfg.t2 = 29; /* tx timeout */ + cfg.t21 = 180; /* CALL timeout */ + cfg.t23 = 180; /* CLEAR timeout */ + + /* adjust MTU */ + if (!conf->mtu || conf->mtu >= 512) + card->wandev.mtu = 512; + else if (conf->mtu >= 256) + card->wandev.mtu = 256; + else if (conf->mtu >= 128) + card->wandev.mtu = 128; + else + card->wandev.mtu = 64; + + cfg.pktlen = cycx_log2(card->wandev.mtu); + + if (conf->station == WANOPT_DTE) { + cfg.locaddr = 3; /* DTE */ + cfg.remaddr = 1; /* DCE */ + } else { + cfg.locaddr = 1; /* DCE */ + cfg.remaddr = 3; /* DTE */ + } + + if (conf->interface == WANOPT_RS232) + cfg.flags = 0; /* FIXME just reset the 2nd bit */ + + if (conf->u.x25.hi_pvc) { + card->u.x.hi_pvc = min_t(unsigned int, conf->u.x25.hi_pvc, 4095); + card->u.x.lo_pvc = min_t(unsigned int, conf->u.x25.lo_pvc, card->u.x.hi_pvc); + } + + if (conf->u.x25.hi_svc) { + card->u.x.hi_svc = min_t(unsigned int, conf->u.x25.hi_svc, 4095); + card->u.x.lo_svc = min_t(unsigned int, conf->u.x25.lo_svc, card->u.x.hi_svc); + } + + if (card->u.x.lo_pvc == 255) + cfg.npvc = 0; + else + cfg.npvc = card->u.x.hi_pvc - card->u.x.lo_pvc + 1; + + cfg.nvc = card->u.x.hi_svc - card->u.x.lo_svc + 1 + cfg.npvc; + + if (conf->u.x25.hdlc_window) + cfg.n2win = min_t(unsigned int, conf->u.x25.hdlc_window, 7); + + if (conf->u.x25.pkt_window) + cfg.n3win = min_t(unsigned int, conf->u.x25.pkt_window, 7); + + if (conf->u.x25.t1) + cfg.t1 = min_t(unsigned int, conf->u.x25.t1, 30); + + if (conf->u.x25.t2) + cfg.t2 = min_t(unsigned int, conf->u.x25.t2, 30); + + if (conf->u.x25.t11_t21) + cfg.t21 = min_t(unsigned int, conf->u.x25.t11_t21, 30); + + if (conf->u.x25.t13_t23) + cfg.t23 = min_t(unsigned int, conf->u.x25.t13_t23, 30); + + if (conf->u.x25.n2) + cfg.n2 = min_t(unsigned int, conf->u.x25.n2, 30); + + /* initialize adapter */ + if (cycx_x25_configure(card, &cfg)) + return -EIO; + + /* Initialize protocol-specific fields of adapter data space */ + card->wandev.bps = conf->bps; + card->wandev.interface = conf->interface; + card->wandev.clocking = conf->clocking; + card->wandev.station = conf->station; + card->isr = cycx_x25_irq_handler; + card->exec = NULL; + card->wandev.update = cycx_wan_update; + card->wandev.new_if = cycx_wan_new_if; + card->wandev.del_if = cycx_wan_del_if; + card->wandev.state = WAN_DISCONNECTED; + + return 0; +} + +/* WAN Device Driver Entry Points */ +/* Update device status & statistics. */ +static int cycx_wan_update(struct wan_device *wandev) +{ + /* sanity checks */ + if (!wandev || !wandev->private) + return -EFAULT; + + if (wandev->state == WAN_UNCONFIGURED) + return -ENODEV; + + cycx_x25_get_stats(wandev->private); + + 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 registration. + * + * Return: 0 o.k. + * < 0 failure (channel will not be created) */ +static int cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev, + wanif_conf_t *conf) +{ + struct cycx_device *card = wandev->private; + struct cycx_x25_channel *chan; + int err = 0; + + if (!conf->name[0] || strlen(conf->name) > WAN_IFNAME_SZ) { + printk(KERN_INFO "%s: invalid interface name!\n", + card->devname); + return -EINVAL; + } + + /* allocate and initialize private data */ + chan = kmalloc(sizeof(struct cycx_x25_channel), GFP_KERNEL); + if (!chan) + return -ENOMEM; + + memset(chan, 0, sizeof(*chan)); + strcpy(chan->name, conf->name); + chan->card = card; + chan->link = conf->port; + chan->protocol = conf->protocol ? ETH_P_X25 : ETH_P_IP; + chan->rx_skb = NULL; + /* only used in svc connected thru crossover cable */ + chan->local_addr = NULL; + + if (conf->addr[0] == '@') { /* SVC */ + int len = strlen(conf->local_addr); + + if (len) { + if (len > WAN_ADDRESS_SZ) { + printk(KERN_ERR "%s: %s local addr too long!\n", + wandev->name, chan->name); + kfree(chan); + return -EINVAL; + } else { + chan->local_addr = kmalloc(len + 1, GFP_KERNEL); + + if (!chan->local_addr) { + kfree(chan); + return -ENOMEM; + } + } + + strncpy(chan->local_addr, conf->local_addr, + WAN_ADDRESS_SZ); + } + + chan->svc = 1; + strncpy(chan->addr, &conf->addr[1], WAN_ADDRESS_SZ); + init_timer(&chan->timer); + chan->timer.function = cycx_x25_chan_timer; + chan->timer.data = (unsigned long)dev; + + /* Set channel timeouts (default if not specified) */ + chan->idle_tmout = conf->idle_timeout ? conf->idle_timeout : 90; + } else if (is_digit(conf->addr[0])) { /* PVC */ + s16 lcn = dec_to_uint(conf->addr, 0); + + if (lcn >= card->u.x.lo_pvc && lcn <= card->u.x.hi_pvc) + chan->lcn = lcn; + else { + printk(KERN_ERR + "%s: PVC %u is out of range on interface %s!\n", + wandev->name, lcn, chan->name); + err = -EINVAL; + } + } else { + printk(KERN_ERR "%s: invalid media address on interface %s!\n", + wandev->name, chan->name); + err = -EINVAL; + } + + if (err) { + if (chan->local_addr) + kfree(chan->local_addr); + + kfree(chan); + return err; + } + + /* prepare network device data space for registration */ + strcpy(dev->name, chan->name); + dev->init = cycx_netdevice_init; + dev->priv = chan; + + return 0; +} + +/* Delete logical channel. */ +static int cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev) +{ + if (dev->priv) { + struct cycx_x25_channel *chan = dev->priv; + + if (chan->svc) { + if (chan->local_addr) + kfree(chan->local_addr); + + if (chan->state == WAN_CONNECTED) + del_timer(&chan->timer); + } + + kfree(chan); + dev->priv = NULL; + } + + return 0; +} + +/* Network Device Interface */ +/* Initialize Linux network interface. + * + * This routine is called only once for each interface, during Linux network + * interface registration. Returning anything but zero will fail interface + * registration. */ +static int cycx_netdevice_init(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + struct cycx_device *card = chan->card; + struct wan_device *wandev = &card->wandev; + + /* Initialize device driver entry points */ + dev->open = cycx_netdevice_open; + dev->stop = cycx_netdevice_stop; + dev->hard_header = cycx_netdevice_hard_header; + dev->rebuild_header = cycx_netdevice_rebuild_header; + dev->hard_start_xmit = cycx_netdevice_hard_start_xmit; + dev->get_stats = cycx_netdevice_get_stats; + + /* Initialize media-specific parameters */ + dev->mtu = CYCX_X25_CHAN_MTU; + dev->type = ARPHRD_HWX25; /* ARP h/w type */ + dev->hard_header_len = 0; /* media header length */ + dev->addr_len = 0; /* hardware address length */ + + if (!chan->svc) + *(u16*)dev->dev_addr = htons(chan->lcn); + + /* Initialize hardware parameters (just for reference) */ + dev->irq = wandev->irq; + dev->dma = wandev->dma; + dev->base_addr = wandev->ioport; + dev->mem_start = (unsigned long)wandev->maddr; + dev->mem_end = (unsigned long)(wandev->maddr + + wandev->msize - 1); + dev->flags |= IFF_NOARP; + + /* Set transmit buffer queue length */ + dev->tx_queue_len = 10; + SET_MODULE_OWNER(dev); + + /* Initialize socket buffers */ + cycx_x25_set_chan_state(dev, WAN_DISCONNECTED); + + return 0; +} + +/* Open network interface. + * o prevent module from unloading by incrementing use count + * o if link is disconnected then initiate connection + * + * Return 0 if O.k. or errno. */ +static int cycx_netdevice_open(struct net_device *dev) +{ + if (netif_running(dev)) + return -EBUSY; /* only one open is allowed */ + + netif_start_queue(dev); + return 0; +} + +/* Close network interface. + * o reset flags. + * o if there's no more open channels then disconnect physical link. */ +static int cycx_netdevice_stop(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + + netif_stop_queue(dev); + + if (chan->state == WAN_CONNECTED || chan->state == WAN_CONNECTING) + cycx_x25_chan_disconnect(dev); + + return 0; +} + +/* Build media header. + * o encapsulate packet according to encapsulation type. + * + * The trick here is to put packet type (Ethertype) into 'protocol' field of + * the socket buffer, so that we don't forget it. If encapsulation fails, + * set skb->protocol to 0 and discard packet later. + * + * Return: media header length. */ +static int cycx_netdevice_hard_header(struct sk_buff *skb, + struct net_device *dev, u16 type, + void *daddr, void *saddr, unsigned len) +{ + skb->protocol = type; + + return dev->hard_header_len; +} + +/* * Re-build media header. + * Return: 1 physical address resolved. + * 0 physical address not resolved */ +static int cycx_netdevice_rebuild_header(struct sk_buff *skb) +{ + return 1; +} + +/* Send a packet on a network interface. + * o set busy flag (marks start of the transmission). + * o check link state. If link is not up, then drop the packet. + * o check channel status. If it's down then initiate a call. + * o pass a packet to corresponding WAN device. + * 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 cycx_netdevice_hard_start_xmit(struct sk_buff *skb, + struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + struct cycx_device *card = chan->card; + + if (!chan->svc) + chan->protocol = skb->protocol; + + if (card->wandev.state != WAN_CONNECTED) + ++chan->ifstats.tx_dropped; + else if (chan->svc && chan->protocol && + chan->protocol != skb->protocol) { + printk(KERN_INFO + "%s: unsupported Ethertype 0x%04X on interface %s!\n", + card->devname, skb->protocol, dev->name); + ++chan->ifstats.tx_errors; + } else if (chan->protocol == ETH_P_IP) { + switch (chan->state) { + case WAN_DISCONNECTED: + if (cycx_x25_chan_connect(dev)) { + netif_stop_queue(dev); + return -EBUSY; + } + /* fall thru */ + case WAN_CONNECTED: + reset_timer(dev); + dev->trans_start = jiffies; + netif_stop_queue(dev); + + if (cycx_x25_chan_send(dev, skb)) + return -EBUSY; + + break; + default: + ++chan->ifstats.tx_dropped; + ++card->wandev.stats.tx_dropped; + } + } else { /* chan->protocol == ETH_P_X25 */ + switch (skb->data[0]) { + case 0: break; + case 1: /* Connect request */ + cycx_x25_chan_connect(dev); + goto free_packet; + case 2: /* Disconnect request */ + cycx_x25_chan_disconnect(dev); + goto free_packet; + default: + printk(KERN_INFO + "%s: unknown %d x25-iface request on %s!\n", + card->devname, skb->data[0], dev->name); + ++chan->ifstats.tx_errors; + goto free_packet; + } + + skb_pull(skb, 1); /* Remove control byte */ + reset_timer(dev); + dev->trans_start = jiffies; + netif_stop_queue(dev); + + if (cycx_x25_chan_send(dev, skb)) { + /* prepare for future retransmissions */ + skb_push(skb, 1); + return -EBUSY; + } + } + +free_packet: + dev_kfree_skb(skb); + + return 0; +} + +/* Get Ethernet-style interface statistics. + * Return a pointer to struct net_device_stats */ +static struct net_device_stats *cycx_netdevice_get_stats(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + + return chan ? &chan->ifstats : NULL; +} + +/* Interrupt Handlers */ +/* X.25 Interrupt Service Routine. */ +static void cycx_x25_irq_handler(struct cycx_device *card) +{ + struct cycx_x25_cmd cmd; + u16 z = 0; + + card->in_isr = 1; + card->buff_int_mode_unbusy = 0; + cycx_peek(&card->hw, X25_RXMBOX_OFFS, &cmd, sizeof(cmd)); + + switch (cmd.command) { + case X25_DATA_INDICATION: + cycx_x25_irq_rx(card, &cmd); + break; + case X25_ACK_FROM_VC: + cycx_x25_irq_tx(card, &cmd); + break; + case X25_LOG: + cycx_x25_irq_log(card, &cmd); + break; + case X25_STATISTIC: + cycx_x25_irq_stat(card, &cmd); + break; + case X25_CONNECT_CONFIRM: + cycx_x25_irq_connect_confirm(card, &cmd); + break; + case X25_CONNECT_INDICATION: + cycx_x25_irq_connect(card, &cmd); + break; + case X25_DISCONNECT_INDICATION: + cycx_x25_irq_disconnect(card, &cmd); + break; + case X25_DISCONNECT_CONFIRM: + cycx_x25_irq_disconnect_confirm(card, &cmd); + break; + case X25_LINE_ON: + cycx_set_state(card, WAN_CONNECTED); + break; + case X25_LINE_OFF: + cycx_set_state(card, WAN_DISCONNECTED); + break; + default: + cycx_x25_irq_spurious(card, &cmd); + break; + } + + cycx_poke(&card->hw, 0, &z, sizeof(z)); + cycx_poke(&card->hw, X25_RXMBOX_OFFS, &z, sizeof(z)); + card->in_isr = 0; +} + +/* Transmit interrupt handler. + * o Release socket buffer + * o Clear 'tbusy' flag */ +static void cycx_x25_irq_tx(struct cycx_device *card, struct cycx_x25_cmd *cmd) +{ + struct net_device *dev; + struct wan_device *wandev = &card->wandev; + u8 lcn; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + + /* unbusy device and then dev_tint(); */ + dev = cycx_x25_get_dev_by_lcn(wandev, lcn); + if (dev) { + card->buff_int_mode_unbusy = 1; + netif_wake_queue(dev); + } else + printk(KERN_ERR "%s:ackvc for inexistent lcn %d\n", + card->devname, lcn); +} + +/* Receive interrupt handler. + * This routine handles fragmented IP packets using M-bit according to the + * RFC1356. + * o map logical channel number to network interface. + * o allocate socket buffer or append received packet to the existing one. + * o if M-bit is reset (i.e. it's the last packet in a sequence) then + * decapsulate packet and pass socket buffer to the protocol stack. + * + * Notes: + * 1. When allocating a socket buffer, if M-bit is set then more data is + * coming and we have to allocate buffer for the maximum IP packet size + * expected on this channel. + * 2. If something goes wrong and X.25 packet has to be dropped (e.g. no + * socket buffers available) the whole packet sequence must be discarded. */ +static void cycx_x25_irq_rx(struct cycx_device *card, struct cycx_x25_cmd *cmd) +{ + struct wan_device *wandev = &card->wandev; + struct net_device *dev; + struct cycx_x25_channel *chan; + struct sk_buff *skb; + u8 bitm, lcn; + int pktlen = cmd->len - 5; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + cycx_peek(&card->hw, cmd->buf + 4, &bitm, sizeof(bitm)); + bitm &= 0x10; + + dev = cycx_x25_get_dev_by_lcn(wandev, lcn); + if (!dev) { + /* Invalid channel, discard packet */ + printk(KERN_INFO "%s: receiving on orphaned LCN %d!\n", + card->devname, lcn); + return; + } + + chan = dev->priv; + reset_timer(dev); + + if (chan->drop_sequence) { + if (!bitm) + chan->drop_sequence = 0; + else + return; + } + + if ((skb = chan->rx_skb) == NULL) { + /* Allocate new socket buffer */ + int bufsize = bitm ? dev->mtu : pktlen; + + if ((skb = dev_alloc_skb((chan->protocol == ETH_P_X25 ? 1 : 0) + + bufsize + + dev->hard_header_len)) == NULL) { + printk(KERN_INFO "%s: no socket buffers available!\n", + card->devname); + chan->drop_sequence = 1; + ++chan->ifstats.rx_dropped; + return; + } + + if (chan->protocol == ETH_P_X25) /* X.25 socket layer control */ + /* 0 = data packet (dev_alloc_skb zeroed skb->data) */ + skb_put(skb, 1); + + skb->dev = dev; + skb->protocol = htons(chan->protocol); + chan->rx_skb = skb; + } + + if (skb_tailroom(skb) < pktlen) { + /* No room for the packet. Call off the whole thing! */ + dev_kfree_skb_irq(skb); + chan->rx_skb = NULL; + + if (bitm) + chan->drop_sequence = 1; + + printk(KERN_INFO "%s: unexpectedly long packet sequence " + "on interface %s!\n", card->devname, dev->name); + ++chan->ifstats.rx_length_errors; + return; + } + + /* Append packet to the socket buffer */ + cycx_peek(&card->hw, cmd->buf + 5, skb_put(skb, pktlen), pktlen); + + if (bitm) + return; /* more data is coming */ + + chan->rx_skb = NULL; /* dequeue packet */ + + ++chan->ifstats.rx_packets; + chan->ifstats.rx_bytes += pktlen; + + skb->mac.raw = skb->data; + netif_rx(skb); + dev->last_rx = jiffies; /* timestamp */ +} + +/* Connect interrupt handler. */ +static void cycx_x25_irq_connect(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + struct wan_device *wandev = &card->wandev; + struct net_device *dev = NULL; + struct cycx_x25_channel *chan; + u8 d[32], + loc[24], + rem[24]; + u8 lcn, sizeloc, sizerem; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + cycx_peek(&card->hw, cmd->buf + 5, &sizeloc, sizeof(sizeloc)); + cycx_peek(&card->hw, cmd->buf + 6, d, cmd->len - 6); + + sizerem = sizeloc >> 4; + sizeloc &= 0x0F; + + loc[0] = rem[0] = '\0'; + + if (sizeloc) + nibble_to_byte(d, loc, sizeloc, 0); + + if (sizerem) + nibble_to_byte(d + (sizeloc >> 1), rem, sizerem, sizeloc & 1); + + dprintk(1, KERN_INFO "%s:lcn=%d, local=%s, remote=%s\n", + __FUNCTION__, lcn, loc, rem); + + dev = cycx_x25_get_dev_by_dte_addr(wandev, rem); + if (!dev) { + /* Invalid channel, discard packet */ + printk(KERN_INFO "%s: connect not expected: remote %s!\n", + card->devname, rem); + return; + } + + chan = dev->priv; + chan->lcn = lcn; + cycx_x25_connect_response(card, chan); + cycx_x25_set_chan_state(dev, WAN_CONNECTED); +} + +/* Connect confirm interrupt handler. */ +static void cycx_x25_irq_connect_confirm(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + struct wan_device *wandev = &card->wandev; + struct net_device *dev; + struct cycx_x25_channel *chan; + u8 lcn, key; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + cycx_peek(&card->hw, cmd->buf + 1, &key, sizeof(key)); + dprintk(1, KERN_INFO "%s: %s:lcn=%d, key=%d\n", + card->devname, __FUNCTION__, lcn, key); + + dev = cycx_x25_get_dev_by_lcn(wandev, -key); + if (!dev) { + /* Invalid channel, discard packet */ + clear_bit(--key, (void*)&card->u.x.connection_keys); + printk(KERN_INFO "%s: connect confirm not expected: lcn %d, " + "key=%d!\n", card->devname, lcn, key); + return; + } + + clear_bit(--key, (void*)&card->u.x.connection_keys); + chan = dev->priv; + chan->lcn = lcn; + cycx_x25_set_chan_state(dev, WAN_CONNECTED); +} + +/* Disconnect confirm interrupt handler. */ +static void cycx_x25_irq_disconnect_confirm(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + struct wan_device *wandev = &card->wandev; + struct net_device *dev; + u8 lcn; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + dprintk(1, KERN_INFO "%s: %s:lcn=%d\n", + card->devname, __FUNCTION__, lcn); + dev = cycx_x25_get_dev_by_lcn(wandev, lcn); + if (!dev) { + /* Invalid channel, discard packet */ + printk(KERN_INFO "%s:disconnect confirm not expected!:lcn %d\n", + card->devname, lcn); + return; + } + + cycx_x25_set_chan_state(dev, WAN_DISCONNECTED); +} + +/* disconnect interrupt handler. */ +static void cycx_x25_irq_disconnect(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + struct wan_device *wandev = &card->wandev; + struct net_device *dev; + u8 lcn; + + cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn)); + dprintk(1, KERN_INFO "%s:lcn=%d\n", __FUNCTION__, lcn); + + dev = cycx_x25_get_dev_by_lcn(wandev, lcn); + if (dev) { + struct cycx_x25_channel *chan = dev->priv; + + cycx_x25_disconnect_response(card, chan->link, lcn); + cycx_x25_set_chan_state(dev, WAN_DISCONNECTED); + } else + cycx_x25_disconnect_response(card, 0, lcn); +} + +/* LOG interrupt handler. */ +static void cycx_x25_irq_log(struct cycx_device *card, struct cycx_x25_cmd *cmd) +{ +#if CYCLOMX_X25_DEBUG + char bf[20]; + u16 size, toread, link, msg_code; + u8 code, routine; + + cycx_peek(&card->hw, cmd->buf, &msg_code, sizeof(msg_code)); + cycx_peek(&card->hw, cmd->buf + 2, &link, sizeof(link)); + cycx_peek(&card->hw, cmd->buf + 4, &size, sizeof(size)); + /* at most 20 bytes are available... thanks to Daniela :) */ + toread = size < 20 ? size : 20; + cycx_peek(&card->hw, cmd->buf + 10, &bf, toread); + cycx_peek(&card->hw, cmd->buf + 10 + toread, &code, 1); + cycx_peek(&card->hw, cmd->buf + 10 + toread + 1, &routine, 1); + + printk(KERN_INFO "cycx_x25_irq_handler: X25_LOG (0x4500) indic.:\n"); + printk(KERN_INFO "cmd->buf=0x%X\n", cmd->buf); + printk(KERN_INFO "Log message code=0x%X\n", msg_code); + printk(KERN_INFO "Link=%d\n", link); + printk(KERN_INFO "log code=0x%X\n", code); + printk(KERN_INFO "log routine=0x%X\n", routine); + printk(KERN_INFO "Message size=%d\n", size); + hex_dump("Message", bf, toread); +#endif +} + +/* STATISTIC interrupt handler. */ +static void cycx_x25_irq_stat(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + cycx_peek(&card->hw, cmd->buf, &card->u.x.stats, + sizeof(card->u.x.stats)); + hex_dump("cycx_x25_irq_stat", (unsigned char*)&card->u.x.stats, + sizeof(card->u.x.stats)); + cycx_x25_dump_stats(&card->u.x.stats); + wake_up_interruptible(&card->wait_stats); +} + +/* Spurious interrupt handler. + * o print a warning + * If number of spurious interrupts exceeded some limit, then ??? */ +static void cycx_x25_irq_spurious(struct cycx_device *card, + struct cycx_x25_cmd *cmd) +{ + printk(KERN_INFO "%s: spurious interrupt (0x%X)!\n", + card->devname, cmd->command); +} +#ifdef CYCLOMX_X25_DEBUG +static void hex_dump(char *msg, unsigned char *p, int len) +{ + unsigned char hex[1024], + * phex = hex; + + if (len >= (sizeof(hex) / 2)) + len = (sizeof(hex) / 2) - 1; + + while (len--) { + sprintf(phex, "%02x", *p++); + phex += 2; + } + + printk(KERN_INFO "%s: %s\n", msg, hex); +} +#endif + +/* Cyclom 2X Firmware-Specific Functions */ +/* Exec X.25 command. */ +static int x25_exec(struct cycx_device *card, int command, int link, + void *d1, int len1, void *d2, int len2) +{ + struct cycx_x25_cmd c; + unsigned long flags; + u32 addr = 0x1200 + 0x2E0 * link + 0x1E2; + u8 retry = CYCX_X25_MAX_CMD_RETRY; + int err = 0; + + c.command = command; + c.link = link; + c.len = len1 + len2; + + spin_lock_irqsave(&card->u.x.lock, flags); + + /* write command */ + cycx_poke(&card->hw, X25_MBOX_OFFS, &c, sizeof(c) - sizeof(c.buf)); + + /* write X.25 data */ + if (d1) { + cycx_poke(&card->hw, addr, d1, len1); + + if (d2) { + if (len2 > 254) { + u32 addr1 = 0xA00 + 0x400 * link; + + cycx_poke(&card->hw, addr + len1, d2, 249); + cycx_poke(&card->hw, addr1, ((u8*)d2) + 249, + len2 - 249); + } else + cycx_poke(&card->hw, addr + len1, d2, len2); + } + } + + /* generate interruption, executing command */ + cycx_intr(&card->hw); + + /* wait till card->mbox == 0 */ + do { + err = cycx_exec(card->mbox); + } while (retry-- && err); + + spin_unlock_irqrestore(&card->u.x.lock, flags); + + return err; +} + +/* Configure adapter. */ +static int cycx_x25_configure(struct cycx_device *card, + struct cycx_x25_config *conf) +{ + struct { + u16 nlinks; + struct cycx_x25_config conf[2]; + } x25_cmd_conf; + + memset(&x25_cmd_conf, 0, sizeof(x25_cmd_conf)); + x25_cmd_conf.nlinks = 2; + x25_cmd_conf.conf[0] = *conf; + /* FIXME: we need to find a way in the wanrouter framework + to configure the second link, for now lets use it + with the same config from the first link, fixing + the interface type to RS232, the speed in 38400 and + the clock to external */ + x25_cmd_conf.conf[1] = *conf; + x25_cmd_conf.conf[1].link = 1; + x25_cmd_conf.conf[1].speed = 5; /* 38400 */ + x25_cmd_conf.conf[1].clock = 8; + x25_cmd_conf.conf[1].flags = 0; /* default = RS232 */ + + cycx_x25_dump_config(&x25_cmd_conf.conf[0]); + cycx_x25_dump_config(&x25_cmd_conf.conf[1]); + + return x25_exec(card, X25_CONFIG, 0, + &x25_cmd_conf, sizeof(x25_cmd_conf), NULL, 0); +} + +/* Get protocol statistics. */ +static int cycx_x25_get_stats(struct cycx_device *card) +{ + /* the firmware expects 20 in the size field!!! + thanks to Daniela */ + int err = x25_exec(card, X25_STATISTIC, 0, NULL, 20, NULL, 0); + + if (err) + return err; + + interruptible_sleep_on(&card->wait_stats); + + if (signal_pending(current)) + return -EINTR; + + card->wandev.stats.rx_packets = card->u.x.stats.n2_rx_frames; + card->wandev.stats.rx_over_errors = card->u.x.stats.rx_over_errors; + card->wandev.stats.rx_crc_errors = card->u.x.stats.rx_crc_errors; + card->wandev.stats.rx_length_errors = 0; /* not available from fw */ + card->wandev.stats.rx_frame_errors = 0; /* not available from fw */ + card->wandev.stats.rx_missed_errors = card->u.x.stats.rx_aborts; + card->wandev.stats.rx_dropped = 0; /* not available from fw */ + card->wandev.stats.rx_errors = 0; /* not available from fw */ + card->wandev.stats.tx_packets = card->u.x.stats.n2_tx_frames; + card->wandev.stats.tx_aborted_errors = card->u.x.stats.tx_aborts; + card->wandev.stats.tx_dropped = 0; /* not available from fw */ + card->wandev.stats.collisions = 0; /* not available from fw */ + card->wandev.stats.tx_errors = 0; /* not available from fw */ + + cycx_x25_dump_devs(&card->wandev); + + return 0; +} + +/* return the number of nibbles */ +static int byte_to_nibble(u8 *s, u8 *d, char *nibble) +{ + int i = 0; + + if (*nibble && *s) { + d[i] |= *s++ - '0'; + *nibble = 0; + ++i; + } + + while (*s) { + d[i] = (*s - '0') << 4; + if (*(s + 1)) + d[i] |= *(s + 1) - '0'; + else { + *nibble = 1; + break; + } + ++i; + s += 2; + } + + return i; +} + +static void nibble_to_byte(u8 *s, u8 *d, u8 len, u8 nibble) +{ + if (nibble) { + *d++ = '0' + (*s++ & 0x0F); + --len; + } + + while (len) { + *d++ = '0' + (*s >> 4); + + if (--len) { + *d++ = '0' + (*s & 0x0F); + --len; + } else break; + + ++s; + } + + *d = '\0'; +} + +/* Place X.25 call. */ +static int x25_place_call(struct cycx_device *card, + struct cycx_x25_channel *chan) +{ + int err = 0, + len; + char d[64], + nibble = 0, + mylen = chan->local_addr ? strlen(chan->local_addr) : 0, + remotelen = strlen(chan->addr); + u8 key; + + if (card->u.x.connection_keys == ~0U) { + printk(KERN_INFO "%s: too many simultaneous connection " + "requests!\n", card->devname); + return -EAGAIN; + } + + key = ffz(card->u.x.connection_keys); + set_bit(key, (void*)&card->u.x.connection_keys); + ++key; + dprintk(1, KERN_INFO "%s:x25_place_call:key=%d\n", card->devname, key); + memset(d, 0, sizeof(d)); + d[1] = key; /* user key */ + d[2] = 0x10; + d[4] = 0x0B; + + len = byte_to_nibble(chan->addr, d + 6, &nibble); + + if (chan->local_addr) + len += byte_to_nibble(chan->local_addr, d + 6 + len, &nibble); + + if (nibble) + ++len; + + d[5] = mylen << 4 | remotelen; + d[6 + len + 1] = 0xCC; /* TCP/IP over X.25, thanks to Daniela :) */ + + if ((err = x25_exec(card, X25_CONNECT_REQUEST, chan->link, + &d, 7 + len + 1, NULL, 0)) != 0) + clear_bit(--key, (void*)&card->u.x.connection_keys); + else + chan->lcn = -key; + + return err; +} + +/* Place X.25 CONNECT RESPONSE. */ +static int cycx_x25_connect_response(struct cycx_device *card, + struct cycx_x25_channel *chan) +{ + u8 d[8]; + + memset(d, 0, sizeof(d)); + d[0] = d[3] = chan->lcn; + d[2] = 0x10; + d[4] = 0x0F; + d[7] = 0xCC; /* TCP/IP over X.25, thanks Daniela */ + + return x25_exec(card, X25_CONNECT_RESPONSE, chan->link, &d, 8, NULL, 0); +} + +/* Place X.25 DISCONNECT RESPONSE. */ +static int cycx_x25_disconnect_response(struct cycx_device *card, u8 link, + u8 lcn) +{ + char d[5]; + + memset(d, 0, sizeof(d)); + d[0] = d[3] = lcn; + d[2] = 0x10; + d[4] = 0x17; + + return x25_exec(card, X25_DISCONNECT_RESPONSE, link, &d, 5, NULL, 0); +} + +/* Clear X.25 call. */ +static int x25_clear_call(struct cycx_device *card, u8 link, u8 lcn, u8 cause, + u8 diagn) +{ + u8 d[7]; + + memset(d, 0, sizeof(d)); + d[0] = d[3] = lcn; + d[2] = 0x10; + d[4] = 0x13; + d[5] = cause; + d[6] = diagn; + + return x25_exec(card, X25_DISCONNECT_REQUEST, link, d, 7, NULL, 0); +} + +/* Send X.25 data packet. */ +static int cycx_x25_send(struct cycx_device *card, u8 link, u8 lcn, u8 bitm, + int len, void *buf) +{ + u8 d[] = "?\xFF\x10??"; + + d[0] = d[3] = lcn; + d[4] = bitm; + + return x25_exec(card, X25_DATA_REQUEST, link, &d, 5, buf, len); +} + +/* Miscellaneous */ +/* Find network device by its channel number. */ +static struct net_device *cycx_x25_get_dev_by_lcn(struct wan_device *wandev, + s16 lcn) +{ + struct net_device *dev = wandev->dev; + struct cycx_x25_channel *chan; + + while (dev) { + chan = (struct cycx_x25_channel*)dev->priv; + + if (chan->lcn == lcn) + break; + dev = chan->slave; + } + return dev; +} + +/* Find network device by its remote dte address. */ +static struct net_device * + cycx_x25_get_dev_by_dte_addr(struct wan_device *wandev, char *dte) +{ + struct net_device *dev = wandev->dev; + struct cycx_x25_channel *chan; + + while (dev) { + chan = (struct cycx_x25_channel*)dev->priv; + + if (!strcmp(chan->addr, dte)) + break; + dev = chan->slave; + } + return dev; +} + +/* Initiate connection on the logical channel. + * o for PVC we just get channel configuration + * o for SVCs place an X.25 call + * + * Return: 0 connected + * >0 connection in progress + * <0 failure */ +static int cycx_x25_chan_connect(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + struct cycx_device *card = chan->card; + + if (chan->svc) { + if (!chan->addr[0]) + return -EINVAL; /* no destination address */ + + dprintk(1, KERN_INFO "%s: placing X.25 call to %s...\n", + card->devname, chan->addr); + + if (x25_place_call(card, chan)) + return -EIO; + + cycx_x25_set_chan_state(dev, WAN_CONNECTING); + return 1; + } else + cycx_x25_set_chan_state(dev, WAN_CONNECTED); + + return 0; +} + +/* Disconnect logical channel. + * o if SVC then clear X.25 call */ +static void cycx_x25_chan_disconnect(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + + if (chan->svc) { + x25_clear_call(chan->card, chan->link, chan->lcn, 0, 0); + cycx_x25_set_chan_state(dev, WAN_DISCONNECTING); + } else + cycx_x25_set_chan_state(dev, WAN_DISCONNECTED); +} + +/* Called by kernel timer */ +static void cycx_x25_chan_timer(unsigned long d) +{ + struct net_device *dev = (struct net_device *)d; + struct cycx_x25_channel *chan = dev->priv; + + if (chan->state == WAN_CONNECTED) + cycx_x25_chan_disconnect(dev); + else + printk(KERN_ERR "%s: %s for svc (%s) not connected!\n", + chan->card->devname, __FUNCTION__, dev->name); +} + +/* Set logical channel state. */ +static void cycx_x25_set_chan_state(struct net_device *dev, u8 state) +{ + struct cycx_x25_channel *chan = dev->priv; + struct cycx_device *card = chan->card; + unsigned long flags; + char *string_state = NULL; + + spin_lock_irqsave(&card->lock, flags); + + if (chan->state != state) { + if (chan->svc && chan->state == WAN_CONNECTED) + del_timer(&chan->timer); + + switch (state) { + case WAN_CONNECTED: + string_state = "connected!"; + *(u16*)dev->dev_addr = htons(chan->lcn); + netif_wake_queue(dev); + reset_timer(dev); + + if (chan->protocol == ETH_P_X25) + cycx_x25_chan_send_event(dev, 1); + + break; + case WAN_CONNECTING: + string_state = "connecting..."; + break; + case WAN_DISCONNECTING: + string_state = "disconnecting..."; + break; + case WAN_DISCONNECTED: + string_state = "disconnected!"; + + if (chan->svc) { + *(unsigned short*)dev->dev_addr = 0; + chan->lcn = 0; + } + + if (chan->protocol == ETH_P_X25) + cycx_x25_chan_send_event(dev, 2); + + netif_wake_queue(dev); + break; + } + + printk(KERN_INFO "%s: interface %s %s\n", card->devname, + dev->name, string_state); + chan->state = state; + } + + spin_unlock_irqrestore(&card->lock, flags); +} + +/* Send packet on a logical channel. + * When this function is called, tx_skb field of the channel data space + * points to the transmit socket buffer. When transmission is complete, + * release socket buffer and reset 'tbusy' flag. + * + * Return: 0 - transmission complete + * 1 - busy + * + * Notes: + * 1. If packet length is greater than MTU for this channel, we'll fragment + * the packet into 'complete sequence' using M-bit. + * 2. When transmission is complete, an event notification should be issued + * to the router. */ +static int cycx_x25_chan_send(struct net_device *dev, struct sk_buff *skb) +{ + struct cycx_x25_channel *chan = dev->priv; + struct cycx_device *card = chan->card; + int bitm = 0; /* final packet */ + unsigned len = skb->len; + + if (skb->len > card->wandev.mtu) { + len = card->wandev.mtu; + bitm = 0x10; /* set M-bit (more data) */ + } + + if (cycx_x25_send(card, chan->link, chan->lcn, bitm, len, skb->data)) + return 1; + + if (bitm) { + skb_pull(skb, len); + return 1; + } + + ++chan->ifstats.tx_packets; + chan->ifstats.tx_bytes += len; + + return 0; +} + +/* Send event (connection, disconnection, etc) to X.25 socket layer */ + +static void cycx_x25_chan_send_event(struct net_device *dev, u8 event) +{ + struct sk_buff *skb; + unsigned char *ptr; + + if ((skb = dev_alloc_skb(1)) == NULL) { + printk(KERN_ERR "%s: out of memory\n", __FUNCTION__); + return; + } + + ptr = skb_put(skb, 1); + *ptr = event; + + skb->protocol = x25_type_trans(skb, dev); + netif_rx(skb); + dev->last_rx = jiffies; /* timestamp */ +} + +/* Convert line speed in bps to a number used by cyclom 2x code. */ +static u8 bps_to_speed_code(u32 bps) +{ + u8 number = 0; /* defaults to the lowest (1200) speed ;> */ + + if (bps >= 512000) number = 8; + else if (bps >= 256000) number = 7; + else if (bps >= 64000) number = 6; + else if (bps >= 38400) number = 5; + else if (bps >= 19200) number = 4; + else if (bps >= 9600) number = 3; + else if (bps >= 4800) number = 2; + else if (bps >= 2400) number = 1; + + return number; +} + +/* log base 2 */ +static u8 cycx_log2(u32 n) +{ + u8 log = 0; + + if (!n) + return 0; + + while (n > 1) { + n >>= 1; + ++log; + } + + return log; +} + +/* Convert decimal string to unsigned integer. + * If len != 0 then only 'len' characters of the string are converted. */ +static unsigned dec_to_uint(u8 *str, int len) +{ + unsigned val = 0; + + if (!len) + len = strlen(str); + + for (; len && is_digit(*str); ++str, --len) + val = (val * 10) + (*str - (unsigned) '0'); + + return val; +} + +static void reset_timer(struct net_device *dev) +{ + struct cycx_x25_channel *chan = dev->priv; + + if (chan->svc) + mod_timer(&chan->timer, jiffies+chan->idle_tmout*HZ); +} +#ifdef CYCLOMX_X25_DEBUG +static void cycx_x25_dump_config(struct cycx_x25_config *conf) +{ + printk(KERN_INFO "X.25 configuration\n"); + printk(KERN_INFO "-----------------\n"); + printk(KERN_INFO "link number=%d\n", conf->link); + printk(KERN_INFO "line speed=%d\n", conf->speed); + printk(KERN_INFO "clock=%sternal\n", conf->clock == 8 ? "Ex" : "In"); + printk(KERN_INFO "# level 2 retransm.=%d\n", conf->n2); + printk(KERN_INFO "level 2 window=%d\n", conf->n2win); + printk(KERN_INFO "level 3 window=%d\n", conf->n3win); + printk(KERN_INFO "# logical channels=%d\n", conf->nvc); + printk(KERN_INFO "level 3 pkt len=%d\n", conf->pktlen); + printk(KERN_INFO "my address=%d\n", conf->locaddr); + printk(KERN_INFO "remote address=%d\n", conf->remaddr); + printk(KERN_INFO "t1=%d seconds\n", conf->t1); + printk(KERN_INFO "t2=%d seconds\n", conf->t2); + printk(KERN_INFO "t21=%d seconds\n", conf->t21); + printk(KERN_INFO "# PVCs=%d\n", conf->npvc); + printk(KERN_INFO "t23=%d seconds\n", conf->t23); + printk(KERN_INFO "flags=0x%x\n", conf->flags); +} + +static void cycx_x25_dump_stats(struct cycx_x25_stats *stats) +{ + printk(KERN_INFO "X.25 statistics\n"); + printk(KERN_INFO "--------------\n"); + printk(KERN_INFO "rx_crc_errors=%d\n", stats->rx_crc_errors); + printk(KERN_INFO "rx_over_errors=%d\n", stats->rx_over_errors); + printk(KERN_INFO "n2_tx_frames=%d\n", stats->n2_tx_frames); + printk(KERN_INFO "n2_rx_frames=%d\n", stats->n2_rx_frames); + printk(KERN_INFO "tx_timeouts=%d\n", stats->tx_timeouts); + printk(KERN_INFO "rx_timeouts=%d\n", stats->rx_timeouts); + printk(KERN_INFO "n3_tx_packets=%d\n", stats->n3_tx_packets); + printk(KERN_INFO "n3_rx_packets=%d\n", stats->n3_rx_packets); + printk(KERN_INFO "tx_aborts=%d\n", stats->tx_aborts); + printk(KERN_INFO "rx_aborts=%d\n", stats->rx_aborts); +} + +static void cycx_x25_dump_devs(struct wan_device *wandev) +{ + struct net_device *dev = wandev->dev; + + printk(KERN_INFO "X.25 dev states\n"); + printk(KERN_INFO "name: addr: txoff: protocol:\n"); + printk(KERN_INFO "---------------------------------------\n"); + + while(dev) { + struct cycx_x25_channel *chan = dev->priv; + + printk(KERN_INFO "%-5.5s %-15.15s %d ETH_P_%s\n", + chan->name, chan->addr, netif_queue_stopped(dev), + chan->protocol == ETH_P_IP ? "IP" : "X25"); + dev = chan->slave; + } +} + +#endif /* CYCLOMX_X25_DEBUG */ +/* End */ |