patch-2.3.6 linux/drivers/net/cycx_x25.c
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- Lines: 1539
- Date:
Wed Jun 2 14:40:22 1999
- Orig file:
v2.3.5/linux/drivers/net/cycx_x25.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -u --recursive --new-file v2.3.5/linux/drivers/net/cycx_x25.c linux/drivers/net/cycx_x25.c
@@ -0,0 +1,1538 @@
+/*
+* cycx_x25.c CYCLOM X Multiprotocol WAN Link Driver. X.25 module.
+*
+* Author: Arnaldo Carvalho de Melo <acme@conectiva.com.br>
+* Copyright: (c) 1998, 1999 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.
+* ============================================================================
+* 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 channes 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
+* Dec 31, 1998 Arnaldo x25_configure
+* this code can be compiled as non module
+* Dec 27, 1998 Arnaldo code cleanup
+* IPX code wiped out! let's decrease code
+* complexity for now, remember: I'm learning! :)
+* bps_to_speed_code OK
+* Dec 26, 1998 Arnaldo Minimal debug code cleanup
+* Aug 08, 1998 Arnaldo Initial version.
+*/
+#define CYCLOMX_X25_DEBUG 1
+
+#include <linux/version.h>
+#include <linux/kernel.h> /* printk(), and other useful stuff */
+#include <linux/stddef.h> /* offsetof(), etc. */
+#include <linux/errno.h> /* return codes */
+#include <linux/string.h> /* inline memset(), etc. */
+#include <linux/malloc.h> /* kmalloc(), kfree() */
+#include <linux/wanrouter.h> /* WAN router definitions */
+#include <asm/byteorder.h> /* htons(), etc. */
+#include <linux/if_arp.h> /* ARPHRD_X25 */
+#include <linux/cyclomx.h> /* CYCLOM X common user API definitions */
+#include <linux/cycx_x25.h> /* X.25 firmware API definitions */
+
+/* Defines & Macros */
+#define MAX_CMD_RETRY 5
+#define X25_CHAN_MTU 2048 /* unfragmented logical channel MTU */
+#define OUT_INTR 1
+#define IN_INTR 0
+
+/* Data Structures */
+/* This is an extention of the 'struct device' we create for each network
+ interface to keep the rest of X.25 channel-specific data. */
+typedef struct x25_channel {
+ 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. */
+ spinlock_t lock;
+ 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 */
+ cycx_t *card; /* -> owner */
+ struct enet_statistics ifstats; /* interface statistics */
+} x25_channel_t;
+
+/* Function Prototypes */
+/* WAN link driver entry points. These are called by the WAN router module. */
+static int update (wan_device_t *wandev),
+ new_if (wan_device_t *wandev, struct device *dev,wanif_conf_t *conf),
+ del_if (wan_device_t *wandev, struct device *dev);
+
+/* Network device interface */
+static int if_init (struct device *dev),
+ if_open (struct device *dev),
+ if_close (struct device *dev),
+ if_header (struct sk_buff *skb, struct device *dev,
+ u16 type, void *daddr, void *saddr, unsigned len),
+ if_rebuild_hdr (struct sk_buff *skb),
+ if_send (struct sk_buff *skb, struct device *dev);
+
+static struct net_device_stats * if_stats (struct device *dev);
+
+/* Interrupt handlers */
+static void cyx_isr (cycx_t *card),
+ tx_intr (cycx_t *card, TX25Cmd *cmd),
+ rx_intr (cycx_t *card, TX25Cmd *cmd),
+ log_intr (cycx_t *card, TX25Cmd *cmd),
+ stat_intr (cycx_t *card, TX25Cmd *cmd),
+ connect_confirm_intr (cycx_t *card, TX25Cmd *cmd),
+ disconnect_confirm_intr (cycx_t *card, TX25Cmd *cmd),
+ connect_intr (cycx_t *card, TX25Cmd *cmd),
+ disconnect_intr (cycx_t *card, TX25Cmd *cmd),
+ spur_intr (cycx_t *card, TX25Cmd *cmd);
+
+/* X.25 firmware interface functions */
+static int x25_configure (cycx_t *card, TX25Config *conf),
+ x25_get_stats (cycx_t *card),
+ x25_send (cycx_t *card, u8 link, u8 lcn, u8 bitm, int len,void *buf),
+ x25_connect_response (cycx_t *card, x25_channel_t *chan),
+ x25_disconnect_response (cycx_t *card, u8 link, u8 lcn);
+
+/* Miscellaneous functions */
+static int chan_connect (struct device *dev),
+ chan_send (struct device *dev, struct sk_buff *skb);
+
+static void set_chan_state (struct device *dev, u8 state, u8 outside_intr),
+ nibble_to_byte (u8 *s, u8 *d, u8 len, u8 nibble),
+ reset_timer (struct device *dev),
+ chan_disc (struct device *dev),
+ chan_timer (unsigned long data);
+
+static u8 bps_to_speed_code (u32 bps);
+static u8 log2 (u32 n);
+
+static unsigned dec_to_uint (u8 *str, int len);
+
+static struct device *get_dev_by_lcn (wan_device_t *wandev, s16 lcn);
+static struct device *get_dev_by_dte_addr (wan_device_t *wandev, char *dte);
+
+#ifdef CYCLOMX_X25_DEBUG
+static void hex_dump(char *msg, unsigned char *p, int len);
+static void x25_dump_config(TX25Config *conf);
+static void x25_dump_stats(TX25Stats *stats);
+static void x25_dump_devs(wan_device_t *wandev);
+#define dprintk(format, a...) printk(format, ##a)
+#else
+#define hex_dump(msg, p, len)
+#define x25_dump_config(conf)
+#define x25_dump_stats(stats)
+#define x25_dump_devs(wandev)
+#define dprintk(format, a...)
+#endif
+/* Public Functions */
+
+/* X.25 Protocol Initialization routine.
+ *
+ * This routine is called by the main CYCLOM X module during setup. At this
+ * point adapter is completely initialized and X.25 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 cyx_init (cycx_t *card, wandev_conf_t *conf)
+{
+ TX25Config 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.critical = 0; /* critical section flag */
+ card->u.x.connection_keys = 0;
+
+ /* Configure adapter. Here we set resonable 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 = 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(conf->u.x25.hi_pvc, 4095);
+ card->u.x.lo_pvc = min(conf->u.x25.lo_pvc, card->u.x.hi_pvc);
+ }
+
+ if (conf->u.x25.hi_svc) {
+ card->u.x.hi_svc = min(conf->u.x25.hi_svc, 4095);
+ card->u.x.lo_svc = min(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(conf->u.x25.hdlc_window, 7);
+
+ if (conf->u.x25.pkt_window)
+ cfg.n3win = min(conf->u.x25.pkt_window, 7);
+
+ if (conf->u.x25.t1)
+ cfg.t1 = min(conf->u.x25.t1, 30);
+
+ if (conf->u.x25.t2)
+ cfg.t2 = min(conf->u.x25.t2, 30);
+
+ if (conf->u.x25.t11_t21)
+ cfg.t21 = min(conf->u.x25.t11_t21, 30);
+
+ if (conf->u.x25.t13_t23)
+ cfg.t23 = min(conf->u.x25.t13_t23, 30);
+
+ if (conf->u.x25.n2)
+ cfg.n2 = min(conf->u.x25.n2, 30);
+
+ /* initialize adapter */
+ if (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 = &cyx_isr;
+ card->exec = NULL;
+ card->wandev.update = &update;
+ card->wandev.new_if = &new_if;
+ card->wandev.del_if = &del_if;
+ card->wandev.state = WAN_DISCONNECTED;
+ card->wandev.enable_tx_int = card->irq_dis_if_send_count = 0;
+ return 0;
+}
+
+/* WAN Device Driver Entry Points */
+/* Update device status & statistics. */
+static int update (wan_device_t *wandev)
+{
+ /* sanity checks */
+ if (!wandev || !wandev->private)
+ return -EFAULT;
+
+ if (wandev->state == WAN_UNCONFIGURED)
+ return -ENODEV;
+
+ 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 registaration.
+ *
+ * Return: 0 o.k.
+ * < 0 failure (channel will not be created) */
+static int new_if (wan_device_t *wandev, struct device *dev, wanif_conf_t *conf)
+{
+ cycx_t *card = wandev->private;
+ x25_channel_t *chan;
+ int err = 0;
+
+ 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 */
+ if ((chan = kmalloc(sizeof(x25_channel_t), GFP_KERNEL)) == NULL)
+ return -ENOMEM;
+
+ memset(chan, 0, sizeof(x25_channel_t));
+ strcpy(chan->name, conf->name);
+ chan->card = card;
+ chan->link = conf->port;
+ chan->protocol = ETH_P_IP;
+ chan->rx_skb = NULL;
+ /* only used in svc connected thru crossover cable */
+ chan->local_addr = NULL;
+ chan->lock = SPIN_LOCK_UNLOCKED;
+
+ if (conf->addr[0] == '@') { /* SVC */
+ int local_len = strlen(conf->local_addr);
+
+ if (local_len) {
+ if (local_len > WAN_ADDRESS_SZ) {
+ printk(KERN_ERR "%s: %s local addr too long!\n",
+ wandev->name, chan->name);
+ kfree(chan);
+ return -EINVAL;
+ } else if ((chan->local_addr = kmalloc(local_len + 1,
+ GFP_KERNEL)) == NULL) {
+ 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 = 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 */
+ dev->name = chan->name;
+ dev->init = &if_init;
+ dev->priv = chan;
+ return 0;
+}
+
+/* Delete logical channel. */
+static int del_if (wan_device_t *wandev, struct device *dev)
+{
+ if (!dev) {
+ printk(KERN_ERR "cycx_x25:del_if:dev == NULL!\n");
+ return 0;
+ }
+
+ if (dev->priv) {
+ x25_channel_t *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 if_init (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+ wan_device_t *wandev = &card->wandev;
+
+ /* Initialize device driver entry points */
+ dev->open = &if_open;
+ dev->stop = &if_close;
+ dev->hard_header = &if_header;
+ dev->rebuild_header = &if_rebuild_hdr;
+ dev->hard_start_xmit = &if_send;
+ dev->get_stats = &if_stats;
+
+ /* Initialize media-specific parameters */
+ dev->mtu = X25_CHAN_MTU;
+ dev->type = ARPHRD_X25; /* 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;
+
+ /* Initialize socket buffers */
+ dev_init_buffers(dev);
+ set_chan_state(dev, WAN_DISCONNECTED, OUT_INTR);
+ 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 if_open (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+
+ if (dev->start)
+ return -EBUSY; /* only one open is allowed */
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ return -EAGAIN;
+
+ dev->interrupt = 0;
+ dev->tbusy = 0;
+ dev->start = 1;
+ cyclomx_open(card);
+
+ card->wandev.critical = 0;
+ return 0;
+}
+
+/* Close network interface.
+ * o reset flags.
+ * o if there's no more open channels then disconnect physical link. */
+static int if_close (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical))
+ return -EAGAIN;
+
+ dev->start = 0;
+
+ if (chan->state == WAN_CONNECTED || chan->state == WAN_CONNECTING)
+ chan_disc(dev);
+
+ cyclomx_close(card);
+
+ card->wandev.critical = 0;
+ 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 if_header (struct sk_buff *skb, struct 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 if_rebuild_hdr (struct sk_buff *skb)
+{
+ return 1;
+}
+
+/* Send a packet on a network interface.
+ * o set tbusy 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 if_send (struct sk_buff *skb, struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+
+ if (dev->tbusy) {
+ ++chan->ifstats.rx_dropped;
+ return -EBUSY;
+ }
+
+ dev->tbusy = 1;
+
+ reset_timer(dev);
+
+ 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 switch (chan->state) {
+ case WAN_DISCONNECTED:
+ if (chan_connect(dev))
+ return -EBUSY;
+ /* fall thru */
+ case WAN_CONNECTED:
+ dev->trans_start = jiffies;
+ if (chan_send(dev, skb)) {
+ dev->tbusy = 1;
+ return -EBUSY;
+ }
+ break;
+ default:
+ ++chan->ifstats.tx_dropped;
+ ++card->wandev.stats.tx_dropped;
+ }
+
+ dev_kfree_skb(skb);
+ return 0;
+}
+
+/* Get Ethernet-style interface statistics.
+ * Return a pointer to struct net_device_stats */
+static struct net_device_stats *if_stats (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+
+ return chan ? &chan->ifstats : NULL;
+}
+
+/* Interrupt Handlers */
+/* X.25 Interrupt Service Routine. */
+static void cyx_isr (cycx_t *card)
+{
+ unsigned long host_cpu_flags;
+ TX25Cmd cmd;
+ u16 z = 0;
+
+ card->in_isr = 1;
+ card->buff_int_mode_unbusy = 0;
+
+ if (test_and_set_bit(0, (void*)&card->wandev.critical)) {
+ printk(KERN_INFO "cyx_isr: %s, wandev.critical set to 0x%02X\n",
+ card->devname, card->wandev.critical);
+ card->in_isr = 0;
+ return;
+ }
+
+ /* For all interrupts set the critical flag to CRITICAL_RX_INTR.
+ * If the if_send routine is called with this flag set it will set
+ * the enable transmit flag to 1. (for a delayed interrupt) */
+ card->wandev.critical = CRITICAL_IN_ISR;
+ cycx_peek(&card->hw, X25_RXMBOX_OFFS, &cmd, sizeof(cmd));
+ switch (cmd.command) {
+ case X25_DATA_INDICATION:
+ rx_intr(card, &cmd);
+ break;
+ case X25_ACK_FROM_VC:
+ tx_intr(card, &cmd);
+ break;
+ case X25_LOG:
+ log_intr(card, &cmd);
+ break;
+ case X25_STATISTIC:
+ stat_intr(card, &cmd);
+ break;
+ case X25_CONNECT_CONFIRM:
+ connect_confirm_intr(card, &cmd);
+ break;
+ case X25_CONNECT_INDICATION:
+ connect_intr(card, &cmd);
+ break;
+ case X25_DISCONNECT_INDICATION:
+ disconnect_intr(card, &cmd);
+ break;
+ case X25_DISCONNECT_CONFIRM:
+ disconnect_confirm_intr(card, &cmd);
+ break;
+ case X25_LINE_ON:
+ cyclomx_set_state(card, WAN_CONNECTED);
+ break;
+ case X25_LINE_OFF:
+ cyclomx_set_state(card, WAN_DISCONNECTED);
+ break;
+ default:
+ spur_intr(card, &cmd); /* unwanted interrupt */
+ }
+
+ cycx_poke(&card->hw, 0, &z, sizeof(z));
+ cycx_poke(&card->hw, X25_RXMBOX_OFFS, &z, sizeof(z));
+
+ card->wandev.critical = CRITICAL_INTR_HANDLED;
+
+ if (card->wandev.enable_tx_int)
+ card->wandev.enable_tx_int = 0;
+
+ spin_lock_irqsave(&card->lock, host_cpu_flags);
+ card->in_isr = 0;
+ card->wandev.critical = 0;
+ spin_unlock_irqrestore(&card->lock, host_cpu_flags);
+
+ if (card->buff_int_mode_unbusy)
+ mark_bh(NET_BH);
+}
+
+/* Transmit interrupt handler.
+ * o Release socket buffer
+ * o Clear 'tbusy' flag */
+static void tx_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ struct device *dev;
+ wan_device_t *wandev = &card->wandev;
+ u8 lcn;
+
+ cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
+
+ /* unbusy device and then dev_tint(); */
+ if ((dev = get_dev_by_lcn (wandev, lcn)) != NULL) {
+ card->buff_int_mode_unbusy = 1;
+ dev->tbusy = 0;
+ } 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 ligical 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
+ * comming 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 rx_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ wan_device_t *wandev = &card->wandev;
+ struct device *dev;
+ x25_channel_t *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;
+
+ if ((dev = get_dev_by_lcn(wandev, lcn)) == NULL) {
+ /* 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(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;
+ }
+
+ 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(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 */
+
+ dev->last_rx = jiffies; /* timestamp */
+ chan->rx_skb = NULL; /* dequeue packet */
+
+ skb->protocol = htons(ETH_P_IP);
+ skb->dev = dev;
+ skb->mac.raw = skb->data;
+ netif_rx(skb);
+ ++chan->ifstats.rx_packets;
+ chan->ifstats.rx_bytes += skb->len;
+}
+
+/* Connect interrupt handler. */
+static void connect_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ wan_device_t *wandev = &card->wandev;
+ struct device *dev = NULL;
+ x25_channel_t *chan;
+ u8 data[32],
+ local[24],
+ rem[24];
+ u8 lcn, sizelocal, sizerem;
+
+ cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
+ cycx_peek(&card->hw, cmd->buf + 5, &sizelocal, sizeof(sizelocal));
+ cycx_peek(&card->hw, cmd->buf + 6, data, cmd->len - 6);
+
+ sizerem = sizelocal >> 4;
+ sizelocal &= 0x0F;
+
+ local[0] = rem[0] = '\0';
+
+ if (sizelocal)
+ nibble_to_byte(data, local, sizelocal, 0);
+
+ if (sizerem)
+ nibble_to_byte(data + (sizelocal >> 1), rem, sizerem, sizelocal & 1);
+ dprintk(KERN_INFO "connect_intr:lcn=%d, local=%s, remote=%s\n",
+ lcn, local, rem);
+ if ((dev = get_dev_by_dte_addr(wandev, rem)) == NULL) {
+ /* Invalid channel, discard packet */
+ printk(KERN_INFO "%s: connect not expected: remote %s!\n",
+ card->devname, rem);
+ return;
+ }
+
+ chan = dev->priv;
+ chan->lcn = lcn;
+ x25_connect_response(card, chan);
+ set_chan_state(dev, WAN_CONNECTED, IN_INTR);
+}
+
+/* Connect confirm interrupt handler. */
+static void connect_confirm_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ wan_device_t *wandev = &card->wandev;
+ struct device *dev;
+ x25_channel_t *chan;
+ u8 lcn, key;
+
+ cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
+ cycx_peek(&card->hw, cmd->buf + 1, &key, sizeof(key));
+ dprintk(KERN_INFO "%s: connect_confirm_intr:lcn=%d, key=%d\n",
+ card->devname, lcn, key);
+ if ((dev = get_dev_by_lcn(wandev, -key)) == NULL) {
+ /* 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;
+ set_chan_state(dev, WAN_CONNECTED, IN_INTR);
+}
+
+/* Disonnect confirm interrupt handler. */
+static void disconnect_confirm_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ wan_device_t *wandev = &card->wandev;
+ struct device *dev;
+ u8 lcn;
+
+ cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
+ dprintk(KERN_INFO "%s: disconnect_confirm_intr:lcn=%d\n",
+ card->devname, lcn);
+ if ((dev = get_dev_by_lcn(wandev, lcn)) == NULL) {
+ /* Invalid channel, discard packet */
+ printk(KERN_INFO "%s:disconnect confirm not expected!:lcn %d\n",
+ card->devname, lcn);
+ return;
+ }
+
+ set_chan_state(dev, WAN_DISCONNECTED, IN_INTR);
+}
+
+/* disconnect interrupt handler. */
+static void disconnect_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ wan_device_t *wandev = &card->wandev;
+ struct device *dev;
+ u8 lcn;
+
+ cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
+ dprintk(KERN_INFO "disconnect_intr:lcn=%d\n", lcn);
+ x25_disconnect_response(card, 0, lcn);
+
+ if ((dev = get_dev_by_lcn(wandev, lcn)) != NULL)
+ set_chan_state(dev, WAN_DISCONNECTED, IN_INTR);
+}
+
+/* LOG interrupt handler. */
+static void log_intr (cycx_t *card, TX25Cmd *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... thanx 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 "cyx_isr: 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 stat_intr (cycx_t *card, TX25Cmd *cmd)
+{
+ cycx_peek(&card->hw, cmd->buf, &card->u.x.stats,
+ sizeof(card->u.x.stats));
+ hex_dump("stat_intr", (unsigned char*)&card->u.x.stats,
+ sizeof(card->u.x.stats));
+ 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 spur_intr (cycx_t *card, TX25Cmd *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 X Firmware-Specific Functions
+ *
+ * Almost all X.25 commands can unexpetedly fail due to so called 'X.25
+ * asynchronous events' such as restart, interrupt, incoming call request,
+ * call clear request, etc. They can't be ignored and have to be dealt with
+ * immediately. To tackle with this problem we execute each interface command
+ * in a loop until good return code is received or maximum number of retries
+ * is reached. Each interface command returns non-zero return code, an
+ * asynchronous event/error handler x25_error() is called.
+ */
+/* Exec x25 command. */
+static int x25_exec (cycx_t *card, int command, int link,
+ void *data1, int len1, void *data2, int len2)
+{
+ TX25Cmd c;
+ u32 addr = 0x1200 + 0x2E0 * link + 0x1E2;
+ int err = 0;
+
+ c.command = command;
+ c.link = link;
+ c.len = len1 + len2;
+
+ if (test_and_set_bit(0, (void*)&card->u.x.critical))
+ return -EAGAIN;
+
+ /* write command */
+ cycx_poke(&card->hw, X25_MBOX_OFFS, &c, sizeof(c) - sizeof(c.buf));
+
+ /* write x25 data */
+ if (data1) {
+ cycx_poke(&card->hw, addr, data1, len1);
+
+ if (data2)
+ if (len2 > 254) {
+ u32 addr1 = 0xA00 + 0x400 * link;
+
+ cycx_poke(&card->hw, addr + len1, data2, 249);
+ cycx_poke(&card->hw, addr1, ((u8*) data2) + 249,
+ len2 - 249);
+ } else
+ cycx_poke(&card->hw, addr + len1, data2, len2);
+ }
+
+ /* generate interruption, executing command */
+ cycx_intr(&card->hw);
+
+ /* wait till card->mbox == 0 */
+ err = cycx_exec(card->mbox);
+ card->u.x.critical = 0;
+
+ return err;
+}
+
+/* Configure adapter. */
+static int x25_configure (cycx_t *card, TX25Config *conf)
+{
+ struct {
+ u16 nlinks;
+ TX25Config 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 */
+
+ x25_dump_config(&x25_cmd_conf.conf[0]);
+ 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 x25_get_stats (cycx_t *card)
+{
+ /* the firmware expects 20 in the size field!!!
+ thanx 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 */
+
+ 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 (cycx_t *card, x25_channel_t *chan)
+{
+ int err = 0,
+ retry = MAX_CMD_RETRY,
+ len;
+ char data[64],
+ nibble = 0,
+ mylen = chan->local_addr ? strlen(chan->local_addr) : 0,
+ remotelen = strlen(chan->addr);
+ u8 key;
+
+ if (card->u.x.connection_keys == ~0UL) {
+ 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(KERN_INFO "%s:x25_place_call:key=%d\n", card->devname, key);
+ memset(data, 0, sizeof(data));
+ data[1] = key; /* user key */
+ data[2] = 0x10;
+ data[4] = 0x0B;
+
+ len = byte_to_nibble(chan->addr, data + 6, &nibble);
+ len += chan->local_addr ? byte_to_nibble(chan->local_addr,
+ data + 6 + len, &nibble) : 0;
+ if (nibble)
+ ++len;
+ data[5] = mylen << 4 | remotelen;
+ data[6 + len + 1] = 0xCC; /* TCP/IP over X.25, thanx to Daniela :) */
+
+ do err = x25_exec(card, X25_CONNECT_REQUEST, chan->link,
+ &data, 7 + len + 1, NULL, 0);
+ while (err && retry--);
+
+ if (err)
+ clear_bit(--key, (void*)&card->u.x.connection_keys);
+ else {
+ chan->lcn = -key;
+ chan->protocol = ETH_P_IP;
+ }
+
+ return err;
+}
+
+/* Place X.25 CONNECT RESPONSE. */
+static int x25_connect_response (cycx_t *card, x25_channel_t *chan)
+{
+ int err = 0,
+ retry = MAX_CMD_RETRY;
+ char data[32];
+
+ memset(data, 0, sizeof(data));
+ data[0] = data[3] = chan->lcn;
+ data[2] = 0x10;
+ data[4] = 0x0F;
+ data[7] = 0xCC; /* TCP/IP over X.25, thanx Daniela */
+
+ do err = x25_exec(card, X25_CONNECT_RESPONSE, chan->link,
+ &data, 8, NULL, 0);
+ while (err && retry--);
+
+ return err;
+}
+
+/* Place X.25 DISCONNECT RESPONSE. */
+static int x25_disconnect_response (cycx_t *card, u8 link, u8 lcn)
+{
+ int err = 0,
+ retry = MAX_CMD_RETRY;
+ char data[5];
+
+ memset(data, 0, sizeof(data));
+ data[0] = data[3] = lcn;
+ data[2] = 0x10;
+ data[4] = 0x17;
+ do err = x25_exec(card, X25_DISCONNECT_RESPONSE, link,
+ &data, 5, NULL, 0);
+ while (err && retry--);
+
+ return err;
+}
+
+/* Clear X.25 call. */
+static int x25_clear_call (cycx_t *card, u8 link, u8 lcn, u8 cause, u8 diagn)
+{
+ int retry = MAX_CMD_RETRY,
+ err;
+ u8 data[7];
+
+ memset(data, 0, sizeof(data));
+ data[0] = data[3] = lcn;
+ data[2] = 0x10;
+ data[4] = 0x13;
+ data[5] = cause;
+ data[6] = diagn;
+
+ do err = x25_exec(card, X25_DISCONNECT_REQUEST, link, data, 7, NULL, 0);
+ while (err && retry--);
+
+ return err;
+}
+
+/* Send X.25 data packet. */
+static int x25_send (cycx_t *card, u8 link, u8 lcn, u8 bitm, int len, void *buf)
+{
+ int err = 0,
+ retry = MAX_CMD_RETRY;
+ u8 data[] = "?\xFF\x10??";
+
+ data[0] = data[3] = lcn;
+ data[4] = bitm;
+
+ do err = x25_exec(card, X25_DATA_REQUEST, link, &data, 5, buf, len);
+ while (err && retry--);
+
+ return err;
+}
+
+/* Miscellaneous */
+/* Find network device by its channel number. */
+static struct device *get_dev_by_lcn (wan_device_t *wandev, s16 lcn)
+{
+ struct device *dev = wandev->dev;
+
+ for (; dev; dev = dev->slave)
+ if (((x25_channel_t*)dev->priv)->lcn == lcn)
+ break;
+ return dev;
+}
+
+/* Find network device by its remote dte address. */
+static struct device *get_dev_by_dte_addr (wan_device_t *wandev, char *dte)
+{
+ struct device *dev = wandev->dev;
+
+ for (; dev; dev = dev->slave)
+ if (!strcmp (((x25_channel_t*)dev->priv)->addr, dte))
+ break;
+ 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 chan_connect (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+
+ if (chan->svc) {
+ if (!chan->addr[0])
+ return -EINVAL; /* no destination address */
+ dprintk(KERN_INFO "%s: placing X.25 call to %s...\n",
+ card->devname, chan->addr);
+ if (x25_place_call(card, chan))
+ return -EIO;
+ set_chan_state(dev, WAN_CONNECTING, OUT_INTR);
+ return 1;
+ } else
+ set_chan_state(dev, WAN_CONNECTED, OUT_INTR);
+
+ return 0;
+}
+
+/* Disconnect logical channel.
+ * o if SVC then clear X.25 call */
+static void chan_disc (struct device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+
+ if (chan->svc) {
+ x25_clear_call(chan->card, chan->link, chan->lcn, 0, 0);
+ set_chan_state(dev, WAN_DISCONNECTING, OUT_INTR);
+ } else
+ set_chan_state(dev, WAN_DISCONNECTED, OUT_INTR);
+}
+
+/* Called by kernel timer */
+static void chan_timer (unsigned long data)
+{
+ struct device *dev = (struct device*) data;
+ x25_channel_t *chan = dev->priv;
+
+ switch (chan->state) {
+ case WAN_CONNECTED:
+ chan_disc(dev);
+ break;
+ default:
+ printk (KERN_ERR "%s: chan_timer for svc (%s) not "
+ "connected!\n",
+ chan->card->devname, dev->name);
+ }
+}
+
+/* Set logical channel state. */
+static void set_chan_state (struct device *dev, u8 state, u8 outside_intr)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *card = chan->card;
+ u32 flags = 0;
+
+ if (outside_intr)
+ spin_lock(&card->lock);
+ else
+ 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:
+ printk (KERN_INFO "%s: interface %s "
+ "connected!\n",
+ card->devname, dev->name);
+ *(u16*)dev->dev_addr = htons(chan->lcn);
+ dev->tbusy = 0;
+ reset_timer(dev);
+ break;
+
+ case WAN_CONNECTING:
+ printk (KERN_INFO "%s: interface %s "
+ "connecting...\n",
+ card->devname, dev->name);
+ break;
+
+ case WAN_DISCONNECTING:
+ printk (KERN_INFO "%s: interface %s "
+ "disconnecting...\n",
+ card->devname, dev->name);
+ break;
+
+ case WAN_DISCONNECTED:
+ printk (KERN_INFO "%s: interface %s "
+ "disconnected!\n",
+ card->devname, dev->name);
+ if (chan->svc) {
+ *(unsigned short*)dev->dev_addr = 0;
+ chan->lcn = 0;
+ }
+ break;
+ }
+
+ chan->state = state;
+ }
+
+ if (outside_intr)
+ spin_unlock(&card->lock);
+ else
+ 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 chan_send (struct device *dev, struct sk_buff *skb)
+{
+ x25_channel_t *chan = dev->priv;
+ cycx_t *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 (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;
+}
+
+/* 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 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 device *dev)
+{
+ x25_channel_t *chan = dev->priv;
+
+ if (!chan->svc)
+ return;
+
+ del_timer(&chan->timer);
+ chan->timer.expires = jiffies + chan->idle_tmout * HZ;
+ add_timer(&chan->timer);
+}
+#ifdef CYCLOMX_X25_DEBUG
+static void x25_dump_config(TX25Config *conf)
+{
+ printk (KERN_INFO "x25 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 x25_dump_stats(TX25Stats *stats)
+{
+ printk (KERN_INFO "x25 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 x25_dump_devs(wan_device_t *wandev)
+{
+ struct device *dev = wandev->dev;
+
+ printk (KERN_INFO "x25 dev states\n");
+ printk (KERN_INFO "name: addr: tbusy:\n");
+ printk (KERN_INFO "----------------------------\n");
+
+ for (; dev; dev = dev->slave) {
+ x25_channel_t *chan = dev->priv;
+
+ printk (KERN_INFO "%-5.5s %-15.15s %ld\n",
+ chan->name, chan->addr, dev->tbusy);
+ }
+}
+
+#endif /* CYCLOMX_X25_DEBUG */
+/* End */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)