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1 /*
2 * cycx_x25.c    Cyclom 2X WAN Link Driver.  X.25 module.
3 *
4 * Author:       Arnaldo Carvalho de Melo <acme@conectiva.com.br>
5 *
6 * Copyright:    (c) 1998-2003 Arnaldo Carvalho de Melo
7 *
8 * Based on sdla_x25.c by Gene Kozin <genek@compuserve.com>
9 *
10 *               This program is free software; you can redistribute it and/or
11 *               modify it under the terms of the GNU General Public License
12 *               as published by the Free Software Foundation; either version
13 *               2 of the License, or (at your option) any later version.
14 * ============================================================================
15 * 2001/01/12    acme            use dev_kfree_skb_irq on interrupt context
16 * 2000/04/02    acme            dprintk, cycx_debug
17 *                               fixed the bug introduced in get_dev_by_lcn and
18 *                               get_dev_by_dte_addr by the anonymous hacker
19 *                               that converted this driver to softnet
20 * 2000/01/08    acme            cleanup
21 * 1999/10/27    acme            use ARPHRD_HWX25 so that the X.25 stack know
22 *                               that we have a X.25 stack implemented in
23 *                               firmware onboard
24 * 1999/10/18    acme            support for X.25 sockets in if_send,
25 *                               beware: socket(AF_X25...) IS WORK IN PROGRESS,
26 *                               TCP/IP over X.25 via wanrouter not affected,
27 *                               working.
28 * 1999/10/09    acme            chan_disc renamed to chan_disconnect,
29 *                               began adding support for X.25 sockets:
30 *                               conf->protocol in new_if
31 * 1999/10/05    acme            fixed return E... to return -E...
32 * 1999/08/10    acme            serialized access to the card thru a spinlock
33 *                               in x25_exec
34 * 1999/08/09    acme            removed per channel spinlocks
35 *                               removed references to enable_tx_int
36 * 1999/05/28    acme            fixed nibble_to_byte, ackvc now properly treated
37 *                               if_send simplified
38 * 1999/05/25    acme            fixed t1, t2, t21 & t23 configuration
39 *                               use spinlocks instead of cli/sti in some points
40 * 1999/05/24    acme            finished the x25_get_stat function
41 * 1999/05/23    acme            dev->type = ARPHRD_X25 (tcpdump only works,
42 *                               AFAIT, with ARPHRD_ETHER). This seems to be
43 *                               needed to use socket(AF_X25)...
44 *                               Now the config file must specify a peer media
45 *                               address for svc channels over a crossover cable.
46 *                               Removed hold_timeout from x25_channel_t,
47 *                               not used.
48 *                               A little enhancement in the DEBUG processing
49 * 1999/05/22    acme            go to DISCONNECTED in disconnect_confirm_intr,
50 *                               instead of chan_disc.
51 * 1999/05/16    marcelo         fixed timer initialization in SVCs
52 * 1999/01/05    acme            x25_configure now get (most of) all
53 *                               parameters...
54 * 1999/01/05    acme            pktlen now (correctly) uses log2 (value
55 *                               configured)
56 * 1999/01/03    acme            judicious use of data types (u8, u16, u32, etc)
57 * 1999/01/03    acme            cyx_isr: reset dpmbase to acknowledge
58 *                               indication (interrupt from cyclom 2x)
59 * 1999/01/02    acme            cyx_isr: first hackings...
60 * 1999/01/0203  acme            when initializing an array don't give less
61 *                               elements than declared...
62 *                               example: char send_cmd[6] = "?\xFF\x10";
63 *                               you'll gonna lose a couple hours, 'cause your
64 *                               brain won't admit that there's an error in the
65 *                               above declaration...  the side effect is that
66 *                               memset is put into the unresolved symbols
67 *                               instead of using the inline memset functions...
68 * 1999/01/02    acme            began chan_connect, chan_send, x25_send
69 * 1998/12/31    acme            x25_configure
70 *                               this code can be compiled as non module
71 * 1998/12/27    acme            code cleanup
72 *                               IPX code wiped out! let's decrease code
73 *                               complexity for now, remember: I'm learning! :)
74 *                               bps_to_speed_code OK
75 * 1998/12/26    acme            Minimal debug code cleanup
76 * 1998/08/08    acme            Initial version.
77 */
78
79 #define CYCLOMX_X25_DEBUG 1
80
81 #include <linux/ctype.h>        /* isdigit() */
82 #include <linux/errno.h>        /* return codes */
83 #include <linux/if_arp.h>       /* ARPHRD_HWX25 */
84 #include <linux/kernel.h>       /* printk(), and other useful stuff */
85 #include <linux/module.h>
86 #include <linux/string.h>       /* inline memset(), etc. */
87 #include <linux/slab.h>         /* kmalloc(), kfree() */
88 #include <linux/stddef.h>       /* offsetof(), etc. */
89 #include <linux/wanrouter.h>    /* WAN router definitions */
90
91 #include <asm/byteorder.h>      /* htons(), etc. */
92
93 #include <linux/cyclomx.h>      /* Cyclom 2X common user API definitions */
94 #include <linux/cycx_x25.h>     /* X.25 firmware API definitions */
95
96 #include <net/x25device.h>
97
98 /* Defines & Macros */
99 #define CYCX_X25_MAX_CMD_RETRY 5
100 #define CYCX_X25_CHAN_MTU 2048  /* unfragmented logical channel MTU */
101
102 /* Data Structures */
103 /* This is an extension of the 'struct net_device' we create for each network
104    interface to keep the rest of X.25 channel-specific data. */
105 struct cycx_x25_channel {
106         /* This member must be first. */
107         struct net_device *slave;       /* WAN slave */
108
109         char name[WAN_IFNAME_SZ+1];     /* interface name, ASCIIZ */
110         char addr[WAN_ADDRESS_SZ+1];    /* media address, ASCIIZ */
111         char *local_addr;               /* local media address, ASCIIZ -
112                                            svc thru crossover cable */
113         s16 lcn;                        /* logical channel number/conn.req.key*/
114         u8 link;
115         struct timer_list timer;        /* timer used for svc channel disc. */
116         u16 protocol;                   /* ethertype, 0 - multiplexed */
117         u8 svc;                         /* 0 - permanent, 1 - switched */
118         u8 state;                       /* channel state */
119         u8 drop_sequence;               /* mark sequence for dropping */
120         u32 idle_tmout;                 /* sec, before disconnecting */
121         struct sk_buff *rx_skb;         /* receive socket buffer */
122         struct cycx_device *card;       /* -> owner */
123         struct net_device_stats ifstats;/* interface statistics */
124 };
125
126 /* Function Prototypes */
127 /* WAN link driver entry points. These are called by the WAN router module. */
128 static int cycx_wan_update(struct wan_device *wandev),
129            cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev,
130                            wanif_conf_t *conf),
131            cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev);
132
133 /* Network device interface */
134 static int cycx_netdevice_init(struct net_device *dev);
135 static int cycx_netdevice_open(struct net_device *dev);
136 static int cycx_netdevice_stop(struct net_device *dev);
137 static int cycx_netdevice_hard_header(struct sk_buff *skb,
138                                       struct net_device *dev, u16 type,
139                                       const void *daddr, const void *saddr,
140                                       unsigned len);
141 static int cycx_netdevice_rebuild_header(struct sk_buff *skb);
142 static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
143                                           struct net_device *dev);
144
145 static struct net_device_stats *
146                         cycx_netdevice_get_stats(struct net_device *dev);
147
148 /* Interrupt handlers */
149 static void cycx_x25_irq_handler(struct cycx_device *card),
150             cycx_x25_irq_tx(struct cycx_device *card, struct cycx_x25_cmd *cmd),
151             cycx_x25_irq_rx(struct cycx_device *card, struct cycx_x25_cmd *cmd),
152             cycx_x25_irq_log(struct cycx_device *card,
153                              struct cycx_x25_cmd *cmd),
154             cycx_x25_irq_stat(struct cycx_device *card,
155                               struct cycx_x25_cmd *cmd),
156             cycx_x25_irq_connect_confirm(struct cycx_device *card,
157                                          struct cycx_x25_cmd *cmd),
158             cycx_x25_irq_disconnect_confirm(struct cycx_device *card,
159                                             struct cycx_x25_cmd *cmd),
160             cycx_x25_irq_connect(struct cycx_device *card,
161                                  struct cycx_x25_cmd *cmd),
162             cycx_x25_irq_disconnect(struct cycx_device *card,
163                                     struct cycx_x25_cmd *cmd),
164             cycx_x25_irq_spurious(struct cycx_device *card,
165                                   struct cycx_x25_cmd *cmd);
166
167 /* X.25 firmware interface functions */
168 static int cycx_x25_configure(struct cycx_device *card,
169                               struct cycx_x25_config *conf),
170            cycx_x25_get_stats(struct cycx_device *card),
171            cycx_x25_send(struct cycx_device *card, u8 link, u8 lcn, u8 bitm,
172                          int len, void *buf),
173            cycx_x25_connect_response(struct cycx_device *card,
174                                 struct cycx_x25_channel *chan),
175            cycx_x25_disconnect_response(struct cycx_device *card, u8 link,
176                                         u8 lcn);
177
178 /* channel functions */
179 static int cycx_x25_chan_connect(struct net_device *dev),
180            cycx_x25_chan_send(struct net_device *dev, struct sk_buff *skb);
181
182 static void cycx_x25_chan_disconnect(struct net_device *dev),
183             cycx_x25_chan_send_event(struct net_device *dev, u8 event);
184
185 /* Miscellaneous functions */
186 static void cycx_x25_set_chan_state(struct net_device *dev, u8 state),
187             cycx_x25_chan_timer(unsigned long d);
188
189 static void nibble_to_byte(u8 *s, u8 *d, u8 len, u8 nibble),
190             reset_timer(struct net_device *dev);
191
192 static u8 bps_to_speed_code(u32 bps);
193 static u8 cycx_log2(u32 n);
194
195 static unsigned dec_to_uint(u8 *str, int len);
196
197 static struct net_device *cycx_x25_get_dev_by_lcn(struct wan_device *wandev,
198                                                   s16 lcn);
199 static struct net_device *
200         cycx_x25_get_dev_by_dte_addr(struct wan_device *wandev, char *dte);
201
202 #ifdef CYCLOMX_X25_DEBUG
203 static void hex_dump(char *msg, unsigned char *p, int len);
204 static void cycx_x25_dump_config(struct cycx_x25_config *conf);
205 static void cycx_x25_dump_stats(struct cycx_x25_stats *stats);
206 static void cycx_x25_dump_devs(struct wan_device *wandev);
207 #else
208 #define hex_dump(msg, p, len)
209 #define cycx_x25_dump_config(conf)
210 #define cycx_x25_dump_stats(stats)
211 #define cycx_x25_dump_devs(wandev)
212 #endif
213 /* Public Functions */
214
215 /* X.25 Protocol Initialization routine.
216  *
217  * This routine is called by the main Cyclom 2X module during setup.  At this
218  * point adapter is completely initialized and X.25 firmware is running.
219  *  o configure adapter
220  *  o initialize protocol-specific fields of the adapter data space.
221  *
222  * Return:      0       o.k.
223  *              < 0     failure.  */
224 int cycx_x25_wan_init(struct cycx_device *card, wandev_conf_t *conf)
225 {
226         struct cycx_x25_config cfg;
227
228         /* Verify configuration ID */
229         if (conf->config_id != WANCONFIG_X25) {
230                 printk(KERN_INFO "%s: invalid configuration ID %u!\n",
231                                  card->devname, conf->config_id);
232                 return -EINVAL;
233         }
234
235         /* Initialize protocol-specific fields */
236         card->mbox  = card->hw.dpmbase + X25_MBOX_OFFS;
237         card->u.x.connection_keys = 0;
238         spin_lock_init(&card->u.x.lock);
239
240         /* Configure adapter. Here we set reasonable defaults, then parse
241          * device configuration structure and set configuration options.
242          * Most configuration options are verified and corrected (if
243          * necessary) since we can't rely on the adapter to do so and don't
244          * want it to fail either. */
245         memset(&cfg, 0, sizeof(cfg));
246         cfg.link = 0;
247         cfg.clock = conf->clocking == WANOPT_EXTERNAL ? 8 : 55;
248         cfg.speed = bps_to_speed_code(conf->bps);
249         cfg.n3win = 7;
250         cfg.n2win = 2;
251         cfg.n2 = 5;
252         cfg.nvc = 1;
253         cfg.npvc = 1;
254         cfg.flags = 0x02; /* default = V35 */
255         cfg.t1 = 10;   /* line carrier timeout */
256         cfg.t2 = 29;   /* tx timeout */
257         cfg.t21 = 180; /* CALL timeout */
258         cfg.t23 = 180; /* CLEAR timeout */
259
260         /* adjust MTU */
261         if (!conf->mtu || conf->mtu >= 512)
262                 card->wandev.mtu = 512;
263         else if (conf->mtu >= 256)
264                 card->wandev.mtu = 256;
265         else if (conf->mtu >= 128)
266                 card->wandev.mtu = 128;
267         else
268                 card->wandev.mtu = 64;
269
270         cfg.pktlen = cycx_log2(card->wandev.mtu);
271
272         if (conf->station == WANOPT_DTE) {
273                 cfg.locaddr = 3; /* DTE */
274                 cfg.remaddr = 1; /* DCE */
275         } else {
276                 cfg.locaddr = 1; /* DCE */
277                 cfg.remaddr = 3; /* DTE */
278         }
279
280         if (conf->interface == WANOPT_RS232)
281                 cfg.flags = 0;      /* FIXME just reset the 2nd bit */
282
283         if (conf->u.x25.hi_pvc) {
284                 card->u.x.hi_pvc = min_t(unsigned int, conf->u.x25.hi_pvc, 4095);
285                 card->u.x.lo_pvc = min_t(unsigned int, conf->u.x25.lo_pvc, card->u.x.hi_pvc);
286         }
287
288         if (conf->u.x25.hi_svc) {
289                 card->u.x.hi_svc = min_t(unsigned int, conf->u.x25.hi_svc, 4095);
290                 card->u.x.lo_svc = min_t(unsigned int, conf->u.x25.lo_svc, card->u.x.hi_svc);
291         }
292
293         if (card->u.x.lo_pvc == 255)
294                 cfg.npvc = 0;
295         else
296                 cfg.npvc = card->u.x.hi_pvc - card->u.x.lo_pvc + 1;
297
298         cfg.nvc = card->u.x.hi_svc - card->u.x.lo_svc + 1 + cfg.npvc;
299
300         if (conf->u.x25.hdlc_window)
301                 cfg.n2win = min_t(unsigned int, conf->u.x25.hdlc_window, 7);
302
303         if (conf->u.x25.pkt_window)
304                 cfg.n3win = min_t(unsigned int, conf->u.x25.pkt_window, 7);
305
306         if (conf->u.x25.t1)
307                 cfg.t1 = min_t(unsigned int, conf->u.x25.t1, 30);
308
309         if (conf->u.x25.t2)
310                 cfg.t2 = min_t(unsigned int, conf->u.x25.t2, 30);
311
312         if (conf->u.x25.t11_t21)
313                 cfg.t21 = min_t(unsigned int, conf->u.x25.t11_t21, 30);
314
315         if (conf->u.x25.t13_t23)
316                 cfg.t23 = min_t(unsigned int, conf->u.x25.t13_t23, 30);
317
318         if (conf->u.x25.n2)
319                 cfg.n2 = min_t(unsigned int, conf->u.x25.n2, 30);
320
321         /* initialize adapter */
322         if (cycx_x25_configure(card, &cfg))
323                 return -EIO;
324
325         /* Initialize protocol-specific fields of adapter data space */
326         card->wandev.bps        = conf->bps;
327         card->wandev.interface  = conf->interface;
328         card->wandev.clocking   = conf->clocking;
329         card->wandev.station    = conf->station;
330         card->isr               = cycx_x25_irq_handler;
331         card->exec              = NULL;
332         card->wandev.update     = cycx_wan_update;
333         card->wandev.new_if     = cycx_wan_new_if;
334         card->wandev.del_if     = cycx_wan_del_if;
335         card->wandev.state      = WAN_DISCONNECTED;
336
337         return 0;
338 }
339
340 /* WAN Device Driver Entry Points */
341 /* Update device status & statistics. */
342 static int cycx_wan_update(struct wan_device *wandev)
343 {
344         /* sanity checks */
345         if (!wandev || !wandev->private)
346                 return -EFAULT;
347
348         if (wandev->state == WAN_UNCONFIGURED)
349                 return -ENODEV;
350
351         cycx_x25_get_stats(wandev->private);
352
353         return 0;
354 }
355
356 /* Create new logical channel.
357  * This routine is called by the router when ROUTER_IFNEW IOCTL is being
358  * handled.
359  * o parse media- and hardware-specific configuration
360  * o make sure that a new channel can be created
361  * o allocate resources, if necessary
362  * o prepare network device structure for registration.
363  *
364  * Return:      0       o.k.
365  *              < 0     failure (channel will not be created) */
366 static int cycx_wan_new_if(struct wan_device *wandev, struct net_device *dev,
367                            wanif_conf_t *conf)
368 {
369         struct cycx_device *card = wandev->private;
370         struct cycx_x25_channel *chan;
371         int err = 0;
372
373         if (!conf->name[0] || strlen(conf->name) > WAN_IFNAME_SZ) {
374                 printk(KERN_INFO "%s: invalid interface name!\n",
375                        card->devname);
376                 return -EINVAL;
377         }
378
379         /* allocate and initialize private data */
380         chan = kzalloc(sizeof(struct cycx_x25_channel), GFP_KERNEL);
381         if (!chan)
382                 return -ENOMEM;
383
384         strcpy(chan->name, conf->name);
385         chan->card = card;
386         chan->link = conf->port;
387         chan->protocol = conf->protocol ? ETH_P_X25 : ETH_P_IP;
388         chan->rx_skb = NULL;
389         /* only used in svc connected thru crossover cable */
390         chan->local_addr = NULL;
391
392         if (conf->addr[0] == '@') {     /* SVC */
393                 int len = strlen(conf->local_addr);
394
395                 if (len) {
396                         if (len > WAN_ADDRESS_SZ) {
397                                 printk(KERN_ERR "%s: %s local addr too long!\n",
398                                                 wandev->name, chan->name);
399                                 kfree(chan);
400                                 return -EINVAL;
401                         } else {
402                                 chan->local_addr = kmalloc(len + 1, GFP_KERNEL);
403
404                                 if (!chan->local_addr) {
405                                         kfree(chan);
406                                         return -ENOMEM;
407                                 }
408                         }
409
410                         strncpy(chan->local_addr, conf->local_addr,
411                                 WAN_ADDRESS_SZ);
412                 }
413
414                 chan->svc = 1;
415                 strncpy(chan->addr, &conf->addr[1], WAN_ADDRESS_SZ);
416                 init_timer(&chan->timer);
417                 chan->timer.function    = cycx_x25_chan_timer;
418                 chan->timer.data        = (unsigned long)dev;
419
420                 /* Set channel timeouts (default if not specified) */
421                 chan->idle_tmout = conf->idle_timeout ? conf->idle_timeout : 90;
422         } else if (isdigit(conf->addr[0])) {    /* PVC */
423                 s16 lcn = dec_to_uint(conf->addr, 0);
424
425                 if (lcn >= card->u.x.lo_pvc && lcn <= card->u.x.hi_pvc)
426                         chan->lcn = lcn;
427                 else {
428                         printk(KERN_ERR
429                                 "%s: PVC %u is out of range on interface %s!\n",
430                                 wandev->name, lcn, chan->name);
431                         err = -EINVAL;
432                 }
433         } else {
434                 printk(KERN_ERR "%s: invalid media address on interface %s!\n",
435                                 wandev->name, chan->name);
436                 err = -EINVAL;
437         }
438
439         if (err) {
440                 kfree(chan->local_addr);
441                 kfree(chan);
442                 return err;
443         }
444
445         /* prepare network device data space for registration */
446         strcpy(dev->name, chan->name);
447         dev->init = cycx_netdevice_init;
448         dev->priv = chan;
449
450         return 0;
451 }
452
453 /* Delete logical channel. */
454 static int cycx_wan_del_if(struct wan_device *wandev, struct net_device *dev)
455 {
456         if (dev->priv) {
457                 struct cycx_x25_channel *chan = dev->priv;
458
459                 if (chan->svc) {
460                         kfree(chan->local_addr);
461                         if (chan->state == WAN_CONNECTED)
462                                 del_timer(&chan->timer);
463                 }
464
465                 kfree(chan);
466                 dev->priv = NULL;
467         }
468
469         return 0;
470 }
471
472
473 /* Network Device Interface */
474
475 static const struct header_ops cycx_header_ops = {
476         .create = cycx_netdevice_hard_header,
477         .rebuild = cycx_netdevice_rebuild_header,
478 };
479
480 /* Initialize Linux network interface.
481  *
482  * This routine is called only once for each interface, during Linux network
483  * interface registration.  Returning anything but zero will fail interface
484  * registration. */
485 static int cycx_netdevice_init(struct net_device *dev)
486 {
487         struct cycx_x25_channel *chan = dev->priv;
488         struct cycx_device *card = chan->card;
489         struct wan_device *wandev = &card->wandev;
490
491         /* Initialize device driver entry points */
492         dev->open               = cycx_netdevice_open;
493         dev->stop               = cycx_netdevice_stop;
494         dev->header_ops         = &cycx_header_ops;
495
496         dev->hard_start_xmit    = cycx_netdevice_hard_start_xmit;
497         dev->get_stats          = cycx_netdevice_get_stats;
498
499         /* Initialize media-specific parameters */
500         dev->mtu                = CYCX_X25_CHAN_MTU;
501         dev->type               = ARPHRD_HWX25; /* ARP h/w type */
502         dev->hard_header_len    = 0;            /* media header length */
503         dev->addr_len           = 0;            /* hardware address length */
504
505         if (!chan->svc)
506                 *(__be16*)dev->dev_addr = htons(chan->lcn);
507
508         /* Initialize hardware parameters (just for reference) */
509         dev->irq                = wandev->irq;
510         dev->dma                = wandev->dma;
511         dev->base_addr          = wandev->ioport;
512         dev->mem_start          = (unsigned long)wandev->maddr;
513         dev->mem_end            = (unsigned long)(wandev->maddr +
514                                                   wandev->msize - 1);
515         dev->flags              |= IFF_NOARP;
516
517         /* Set transmit buffer queue length */
518         dev->tx_queue_len       = 10;
519
520         /* Initialize socket buffers */
521         cycx_x25_set_chan_state(dev, WAN_DISCONNECTED);
522
523         return 0;
524 }
525
526 /* Open network interface.
527  * o prevent module from unloading by incrementing use count
528  * o if link is disconnected then initiate connection
529  *
530  * Return 0 if O.k. or errno.  */
531 static int cycx_netdevice_open(struct net_device *dev)
532 {
533         if (netif_running(dev))
534                 return -EBUSY; /* only one open is allowed */
535
536         netif_start_queue(dev);
537         return 0;
538 }
539
540 /* Close network interface.
541  * o reset flags.
542  * o if there's no more open channels then disconnect physical link. */
543 static int cycx_netdevice_stop(struct net_device *dev)
544 {
545         struct cycx_x25_channel *chan = dev->priv;
546
547         netif_stop_queue(dev);
548
549         if (chan->state == WAN_CONNECTED || chan->state == WAN_CONNECTING)
550                 cycx_x25_chan_disconnect(dev);
551
552         return 0;
553 }
554
555 /* Build media header.
556  * o encapsulate packet according to encapsulation type.
557  *
558  * The trick here is to put packet type (Ethertype) into 'protocol' field of
559  * the socket buffer, so that we don't forget it.  If encapsulation fails,
560  * set skb->protocol to 0 and discard packet later.
561  *
562  * Return:      media header length. */
563 static int cycx_netdevice_hard_header(struct sk_buff *skb,
564                                       struct net_device *dev, u16 type,
565                                       const void *daddr, const void *saddr,
566                                       unsigned len)
567 {
568         skb->protocol = htons(type);
569
570         return dev->hard_header_len;
571 }
572
573 /* * Re-build media header.
574  * Return:      1       physical address resolved.
575  *              0       physical address not resolved */
576 static int cycx_netdevice_rebuild_header(struct sk_buff *skb)
577 {
578         return 1;
579 }
580
581 /* Send a packet on a network interface.
582  * o set busy flag (marks start of the transmission).
583  * o check link state. If link is not up, then drop the packet.
584  * o check channel status. If it's down then initiate a call.
585  * o pass a packet to corresponding WAN device.
586  * o free socket buffer
587  *
588  * Return:      0       complete (socket buffer must be freed)
589  *              non-0   packet may be re-transmitted (tbusy must be set)
590  *
591  * Notes:
592  * 1. This routine is called either by the protocol stack or by the "net
593  *    bottom half" (with interrupts enabled).
594  * 2. Setting tbusy flag will inhibit further transmit requests from the
595  *    protocol stack and can be used for flow control with protocol layer. */
596 static int cycx_netdevice_hard_start_xmit(struct sk_buff *skb,
597                                           struct net_device *dev)
598 {
599         struct cycx_x25_channel *chan = dev->priv;
600         struct cycx_device *card = chan->card;
601
602         if (!chan->svc)
603                 chan->protocol = ntohs(skb->protocol);
604
605         if (card->wandev.state != WAN_CONNECTED)
606                 ++chan->ifstats.tx_dropped;
607         else if (chan->svc && chan->protocol &&
608                  chan->protocol != ntohs(skb->protocol)) {
609                 printk(KERN_INFO
610                        "%s: unsupported Ethertype 0x%04X on interface %s!\n",
611                        card->devname, ntohs(skb->protocol), dev->name);
612                 ++chan->ifstats.tx_errors;
613         } else if (chan->protocol == ETH_P_IP) {
614                 switch (chan->state) {
615                 case WAN_DISCONNECTED:
616                         if (cycx_x25_chan_connect(dev)) {
617                                 netif_stop_queue(dev);
618                                 return -EBUSY;
619                         }
620                         /* fall thru */
621                 case WAN_CONNECTED:
622                         reset_timer(dev);
623                         dev->trans_start = jiffies;
624                         netif_stop_queue(dev);
625
626                         if (cycx_x25_chan_send(dev, skb))
627                                 return -EBUSY;
628
629                         break;
630                 default:
631                         ++chan->ifstats.tx_dropped;
632                         ++card->wandev.stats.tx_dropped;
633         }
634         } else { /* chan->protocol == ETH_P_X25 */
635                 switch (skb->data[0]) {
636                 case 0: break;
637                 case 1: /* Connect request */
638                         cycx_x25_chan_connect(dev);
639                         goto free_packet;
640                 case 2: /* Disconnect request */
641                         cycx_x25_chan_disconnect(dev);
642                         goto free_packet;
643                 default:
644                         printk(KERN_INFO
645                                "%s: unknown %d x25-iface request on %s!\n",
646                                card->devname, skb->data[0], dev->name);
647                         ++chan->ifstats.tx_errors;
648                         goto free_packet;
649                 }
650
651                 skb_pull(skb, 1); /* Remove control byte */
652                 reset_timer(dev);
653                 dev->trans_start = jiffies;
654                 netif_stop_queue(dev);
655
656                 if (cycx_x25_chan_send(dev, skb)) {
657                         /* prepare for future retransmissions */
658                         skb_push(skb, 1);
659                         return -EBUSY;
660                 }
661         }
662
663 free_packet:
664         dev_kfree_skb(skb);
665
666         return 0;
667 }
668
669 /* Get Ethernet-style interface statistics.
670  * Return a pointer to struct net_device_stats */
671 static struct net_device_stats *cycx_netdevice_get_stats(struct net_device *dev)
672 {
673         struct cycx_x25_channel *chan = dev->priv;
674
675         return chan ? &chan->ifstats : NULL;
676 }
677
678 /* Interrupt Handlers */
679 /* X.25 Interrupt Service Routine. */
680 static void cycx_x25_irq_handler(struct cycx_device *card)
681 {
682         struct cycx_x25_cmd cmd;
683         u16 z = 0;
684
685         card->in_isr = 1;
686         card->buff_int_mode_unbusy = 0;
687         cycx_peek(&card->hw, X25_RXMBOX_OFFS, &cmd, sizeof(cmd));
688
689         switch (cmd.command) {
690         case X25_DATA_INDICATION:
691                 cycx_x25_irq_rx(card, &cmd);
692                 break;
693         case X25_ACK_FROM_VC:
694                 cycx_x25_irq_tx(card, &cmd);
695                 break;
696         case X25_LOG:
697                 cycx_x25_irq_log(card, &cmd);
698                 break;
699         case X25_STATISTIC:
700                 cycx_x25_irq_stat(card, &cmd);
701                 break;
702         case X25_CONNECT_CONFIRM:
703                 cycx_x25_irq_connect_confirm(card, &cmd);
704                 break;
705         case X25_CONNECT_INDICATION:
706                 cycx_x25_irq_connect(card, &cmd);
707                 break;
708         case X25_DISCONNECT_INDICATION:
709                 cycx_x25_irq_disconnect(card, &cmd);
710                 break;
711         case X25_DISCONNECT_CONFIRM:
712                 cycx_x25_irq_disconnect_confirm(card, &cmd);
713                 break;
714         case X25_LINE_ON:
715                 cycx_set_state(card, WAN_CONNECTED);
716                 break;
717         case X25_LINE_OFF:
718                 cycx_set_state(card, WAN_DISCONNECTED);
719                 break;
720         default:
721                 cycx_x25_irq_spurious(card, &cmd);
722                 break;
723         }
724
725         cycx_poke(&card->hw, 0, &z, sizeof(z));
726         cycx_poke(&card->hw, X25_RXMBOX_OFFS, &z, sizeof(z));
727         card->in_isr = 0;
728 }
729
730 /* Transmit interrupt handler.
731  *      o Release socket buffer
732  *      o Clear 'tbusy' flag */
733 static void cycx_x25_irq_tx(struct cycx_device *card, struct cycx_x25_cmd *cmd)
734 {
735         struct net_device *dev;
736         struct wan_device *wandev = &card->wandev;
737         u8 lcn;
738
739         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
740
741         /* unbusy device and then dev_tint(); */
742         dev = cycx_x25_get_dev_by_lcn(wandev, lcn);
743         if (dev) {
744                 card->buff_int_mode_unbusy = 1;
745                 netif_wake_queue(dev);
746         } else
747                 printk(KERN_ERR "%s:ackvc for inexistent lcn %d\n",
748                                  card->devname, lcn);
749 }
750
751 /* Receive interrupt handler.
752  * This routine handles fragmented IP packets using M-bit according to the
753  * RFC1356.
754  * o map logical channel number to network interface.
755  * o allocate socket buffer or append received packet to the existing one.
756  * o if M-bit is reset (i.e. it's the last packet in a sequence) then
757  *   decapsulate packet and pass socket buffer to the protocol stack.
758  *
759  * Notes:
760  * 1. When allocating a socket buffer, if M-bit is set then more data is
761  *    coming and we have to allocate buffer for the maximum IP packet size
762  *    expected on this channel.
763  * 2. If something goes wrong and X.25 packet has to be dropped (e.g. no
764  *    socket buffers available) the whole packet sequence must be discarded. */
765 static void cycx_x25_irq_rx(struct cycx_device *card, struct cycx_x25_cmd *cmd)
766 {
767         struct wan_device *wandev = &card->wandev;
768         struct net_device *dev;
769         struct cycx_x25_channel *chan;
770         struct sk_buff *skb;
771         u8 bitm, lcn;
772         int pktlen = cmd->len - 5;
773
774         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
775         cycx_peek(&card->hw, cmd->buf + 4, &bitm, sizeof(bitm));
776         bitm &= 0x10;
777
778         dev = cycx_x25_get_dev_by_lcn(wandev, lcn);
779         if (!dev) {
780                 /* Invalid channel, discard packet */
781                 printk(KERN_INFO "%s: receiving on orphaned LCN %d!\n",
782                                  card->devname, lcn);
783                 return;
784         }
785
786         chan = dev->priv;
787         reset_timer(dev);
788
789         if (chan->drop_sequence) {
790                 if (!bitm)
791                         chan->drop_sequence = 0;
792                 else
793                         return;
794         }
795
796         if ((skb = chan->rx_skb) == NULL) {
797                 /* Allocate new socket buffer */
798                 int bufsize = bitm ? dev->mtu : pktlen;
799
800                 if ((skb = dev_alloc_skb((chan->protocol == ETH_P_X25 ? 1 : 0) +
801                                          bufsize +
802                                          dev->hard_header_len)) == NULL) {
803                         printk(KERN_INFO "%s: no socket buffers available!\n",
804                                          card->devname);
805                         chan->drop_sequence = 1;
806                         ++chan->ifstats.rx_dropped;
807                         return;
808                 }
809
810                 if (chan->protocol == ETH_P_X25) /* X.25 socket layer control */
811                         /* 0 = data packet (dev_alloc_skb zeroed skb->data) */
812                         skb_put(skb, 1);
813
814                 skb->dev = dev;
815                 skb->protocol = htons(chan->protocol);
816                 chan->rx_skb = skb;
817         }
818
819         if (skb_tailroom(skb) < pktlen) {
820                 /* No room for the packet. Call off the whole thing! */
821                 dev_kfree_skb_irq(skb);
822                 chan->rx_skb = NULL;
823
824                 if (bitm)
825                         chan->drop_sequence = 1;
826
827                 printk(KERN_INFO "%s: unexpectedly long packet sequence "
828                         "on interface %s!\n", card->devname, dev->name);
829                 ++chan->ifstats.rx_length_errors;
830                 return;
831         }
832
833         /* Append packet to the socket buffer  */
834         cycx_peek(&card->hw, cmd->buf + 5, skb_put(skb, pktlen), pktlen);
835
836         if (bitm)
837                 return; /* more data is coming */
838
839         chan->rx_skb = NULL;            /* dequeue packet */
840
841         ++chan->ifstats.rx_packets;
842         chan->ifstats.rx_bytes += pktlen;
843
844         skb_reset_mac_header(skb);
845         netif_rx(skb);
846         dev->last_rx = jiffies;         /* timestamp */
847 }
848
849 /* Connect interrupt handler. */
850 static void cycx_x25_irq_connect(struct cycx_device *card,
851                                  struct cycx_x25_cmd *cmd)
852 {
853         struct wan_device *wandev = &card->wandev;
854         struct net_device *dev = NULL;
855         struct cycx_x25_channel *chan;
856         u8 d[32],
857            loc[24],
858            rem[24];
859         u8 lcn, sizeloc, sizerem;
860
861         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
862         cycx_peek(&card->hw, cmd->buf + 5, &sizeloc, sizeof(sizeloc));
863         cycx_peek(&card->hw, cmd->buf + 6, d, cmd->len - 6);
864
865         sizerem = sizeloc >> 4;
866         sizeloc &= 0x0F;
867
868         loc[0] = rem[0] = '\0';
869
870         if (sizeloc)
871                 nibble_to_byte(d, loc, sizeloc, 0);
872
873         if (sizerem)
874                 nibble_to_byte(d + (sizeloc >> 1), rem, sizerem, sizeloc & 1);
875
876         dprintk(1, KERN_INFO "%s:lcn=%d, local=%s, remote=%s\n",
877                           __func__, lcn, loc, rem);
878
879         dev = cycx_x25_get_dev_by_dte_addr(wandev, rem);
880         if (!dev) {
881                 /* Invalid channel, discard packet */
882                 printk(KERN_INFO "%s: connect not expected: remote %s!\n",
883                                  card->devname, rem);
884                 return;
885         }
886
887         chan = dev->priv;
888         chan->lcn = lcn;
889         cycx_x25_connect_response(card, chan);
890         cycx_x25_set_chan_state(dev, WAN_CONNECTED);
891 }
892
893 /* Connect confirm interrupt handler. */
894 static void cycx_x25_irq_connect_confirm(struct cycx_device *card,
895                                          struct cycx_x25_cmd *cmd)
896 {
897         struct wan_device *wandev = &card->wandev;
898         struct net_device *dev;
899         struct cycx_x25_channel *chan;
900         u8 lcn, key;
901
902         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
903         cycx_peek(&card->hw, cmd->buf + 1, &key, sizeof(key));
904         dprintk(1, KERN_INFO "%s: %s:lcn=%d, key=%d\n",
905                           card->devname, __func__, lcn, key);
906
907         dev = cycx_x25_get_dev_by_lcn(wandev, -key);
908         if (!dev) {
909                 /* Invalid channel, discard packet */
910                 clear_bit(--key, (void*)&card->u.x.connection_keys);
911                 printk(KERN_INFO "%s: connect confirm not expected: lcn %d, "
912                                  "key=%d!\n", card->devname, lcn, key);
913                 return;
914         }
915
916         clear_bit(--key, (void*)&card->u.x.connection_keys);
917         chan = dev->priv;
918         chan->lcn = lcn;
919         cycx_x25_set_chan_state(dev, WAN_CONNECTED);
920 }
921
922 /* Disconnect confirm interrupt handler. */
923 static void cycx_x25_irq_disconnect_confirm(struct cycx_device *card,
924                                             struct cycx_x25_cmd *cmd)
925 {
926         struct wan_device *wandev = &card->wandev;
927         struct net_device *dev;
928         u8 lcn;
929
930         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
931         dprintk(1, KERN_INFO "%s: %s:lcn=%d\n",
932                           card->devname, __func__, lcn);
933         dev = cycx_x25_get_dev_by_lcn(wandev, lcn);
934         if (!dev) {
935                 /* Invalid channel, discard packet */
936                 printk(KERN_INFO "%s:disconnect confirm not expected!:lcn %d\n",
937                                  card->devname, lcn);
938                 return;
939         }
940
941         cycx_x25_set_chan_state(dev, WAN_DISCONNECTED);
942 }
943
944 /* disconnect interrupt handler. */
945 static void cycx_x25_irq_disconnect(struct cycx_device *card,
946                                     struct cycx_x25_cmd *cmd)
947 {
948         struct wan_device *wandev = &card->wandev;
949         struct net_device *dev;
950         u8 lcn;
951
952         cycx_peek(&card->hw, cmd->buf, &lcn, sizeof(lcn));
953         dprintk(1, KERN_INFO "%s:lcn=%d\n", __func__, lcn);
954
955         dev = cycx_x25_get_dev_by_lcn(wandev, lcn);
956         if (dev) {
957                 struct cycx_x25_channel *chan = dev->priv;
958
959                 cycx_x25_disconnect_response(card, chan->link, lcn);
960                 cycx_x25_set_chan_state(dev, WAN_DISCONNECTED);
961         } else
962                 cycx_x25_disconnect_response(card, 0, lcn);
963 }
964
965 /* LOG interrupt handler. */
966 static void cycx_x25_irq_log(struct cycx_device *card, struct cycx_x25_cmd *cmd)
967 {
968 #if CYCLOMX_X25_DEBUG
969         char bf[20];
970         u16 size, toread, link, msg_code;
971         u8 code, routine;
972
973         cycx_peek(&card->hw, cmd->buf, &msg_code, sizeof(msg_code));
974         cycx_peek(&card->hw, cmd->buf + 2, &link, sizeof(link));
975         cycx_peek(&card->hw, cmd->buf + 4, &size, sizeof(size));
976         /* at most 20 bytes are available... thanks to Daniela :) */
977         toread = size < 20 ? size : 20;
978         cycx_peek(&card->hw, cmd->buf + 10, &bf, toread);
979         cycx_peek(&card->hw, cmd->buf + 10 + toread, &code, 1);
980         cycx_peek(&card->hw, cmd->buf + 10 + toread + 1, &routine, 1);
981
982         printk(KERN_INFO "cycx_x25_irq_handler: X25_LOG (0x4500) indic.:\n");
983         printk(KERN_INFO "cmd->buf=0x%X\n", cmd->buf);
984         printk(KERN_INFO "Log message code=0x%X\n", msg_code);
985         printk(KERN_INFO "Link=%d\n", link);
986         printk(KERN_INFO "log code=0x%X\n", code);
987         printk(KERN_INFO "log routine=0x%X\n", routine);
988         printk(KERN_INFO "Message size=%d\n", size);
989         hex_dump("Message", bf, toread);
990 #endif
991 }
992
993 /* STATISTIC interrupt handler. */
994 static void cycx_x25_irq_stat(struct cycx_device *card,
995                               struct cycx_x25_cmd *cmd)
996 {
997         cycx_peek(&card->hw, cmd->buf, &card->u.x.stats,
998                   sizeof(card->u.x.stats));
999         hex_dump("cycx_x25_irq_stat", (unsigned char*)&card->u.x.stats,
1000                  sizeof(card->u.x.stats));
1001         cycx_x25_dump_stats(&card->u.x.stats);
1002         wake_up_interruptible(&card->wait_stats);
1003 }
1004
1005 /* Spurious interrupt handler.
1006  * o print a warning
1007  * If number of spurious interrupts exceeded some limit, then ??? */
1008 static void cycx_x25_irq_spurious(struct cycx_device *card,
1009                                   struct cycx_x25_cmd *cmd)
1010 {
1011         printk(KERN_INFO "%s: spurious interrupt (0x%X)!\n",
1012                          card->devname, cmd->command);
1013 }
1014 #ifdef CYCLOMX_X25_DEBUG
1015 static void hex_dump(char *msg, unsigned char *p, int len)
1016 {
1017         unsigned char hex[1024],
1018                 * phex = hex;
1019
1020         if (len >= (sizeof(hex) / 2))
1021                 len = (sizeof(hex) / 2) - 1;
1022
1023         while (len--) {
1024                 sprintf(phex, "%02x", *p++);
1025                 phex += 2;
1026         }
1027
1028         printk(KERN_INFO "%s: %s\n", msg, hex);
1029 }
1030 #endif
1031
1032 /* Cyclom 2X Firmware-Specific Functions */
1033 /* Exec X.25 command. */
1034 static int x25_exec(struct cycx_device *card, int command, int link,
1035                     void *d1, int len1, void *d2, int len2)
1036 {
1037         struct cycx_x25_cmd c;
1038         unsigned long flags;
1039         u32 addr = 0x1200 + 0x2E0 * link + 0x1E2;
1040         u8 retry = CYCX_X25_MAX_CMD_RETRY;
1041         int err = 0;
1042
1043         c.command = command;
1044         c.link = link;
1045         c.len = len1 + len2;
1046
1047         spin_lock_irqsave(&card->u.x.lock, flags);
1048
1049         /* write command */
1050         cycx_poke(&card->hw, X25_MBOX_OFFS, &c, sizeof(c) - sizeof(c.buf));
1051
1052         /* write X.25 data */
1053         if (d1) {
1054                 cycx_poke(&card->hw, addr, d1, len1);
1055
1056                 if (d2) {
1057                         if (len2 > 254) {
1058                                 u32 addr1 = 0xA00 + 0x400 * link;
1059
1060                                 cycx_poke(&card->hw, addr + len1, d2, 249);
1061                                 cycx_poke(&card->hw, addr1, ((u8*)d2) + 249,
1062                                           len2 - 249);
1063                         } else
1064                                 cycx_poke(&card->hw, addr + len1, d2, len2);
1065                 }
1066         }
1067
1068         /* generate interruption, executing command */
1069         cycx_intr(&card->hw);
1070
1071         /* wait till card->mbox == 0 */
1072         do {
1073                 err = cycx_exec(card->mbox);
1074         } while (retry-- && err);
1075
1076         spin_unlock_irqrestore(&card->u.x.lock, flags);
1077
1078         return err;
1079 }
1080
1081 /* Configure adapter. */
1082 static int cycx_x25_configure(struct cycx_device *card,
1083                               struct cycx_x25_config *conf)
1084 {
1085         struct {
1086                 u16 nlinks;
1087                 struct cycx_x25_config conf[2];
1088         } x25_cmd_conf;
1089
1090         memset(&x25_cmd_conf, 0, sizeof(x25_cmd_conf));
1091         x25_cmd_conf.nlinks = 2;
1092         x25_cmd_conf.conf[0] = *conf;
1093         /* FIXME: we need to find a way in the wanrouter framework
1094                   to configure the second link, for now lets use it
1095                   with the same config from the first link, fixing
1096                   the interface type to RS232, the speed in 38400 and
1097                   the clock to external */
1098         x25_cmd_conf.conf[1] = *conf;
1099         x25_cmd_conf.conf[1].link = 1;
1100         x25_cmd_conf.conf[1].speed = 5; /* 38400 */
1101         x25_cmd_conf.conf[1].clock = 8;
1102         x25_cmd_conf.conf[1].flags = 0; /* default = RS232 */
1103
1104         cycx_x25_dump_config(&x25_cmd_conf.conf[0]);
1105         cycx_x25_dump_config(&x25_cmd_conf.conf[1]);
1106
1107         return x25_exec(card, X25_CONFIG, 0,
1108                         &x25_cmd_conf, sizeof(x25_cmd_conf), NULL, 0);
1109 }
1110
1111 /* Get protocol statistics. */
1112 static int cycx_x25_get_stats(struct cycx_device *card)
1113 {
1114         /* the firmware expects 20 in the size field!!!
1115            thanks to Daniela */
1116         int err = x25_exec(card, X25_STATISTIC, 0, NULL, 20, NULL, 0);
1117
1118         if (err)
1119                 return err;
1120
1121         interruptible_sleep_on(&card->wait_stats);
1122
1123         if (signal_pending(current))
1124                 return -EINTR;
1125
1126         card->wandev.stats.rx_packets = card->u.x.stats.n2_rx_frames;
1127         card->wandev.stats.rx_over_errors = card->u.x.stats.rx_over_errors;
1128         card->wandev.stats.rx_crc_errors = card->u.x.stats.rx_crc_errors;
1129         card->wandev.stats.rx_length_errors = 0; /* not available from fw */
1130         card->wandev.stats.rx_frame_errors = 0; /* not available from fw */
1131         card->wandev.stats.rx_missed_errors = card->u.x.stats.rx_aborts;
1132         card->wandev.stats.rx_dropped = 0; /* not available from fw */
1133         card->wandev.stats.rx_errors = 0; /* not available from fw */
1134         card->wandev.stats.tx_packets = card->u.x.stats.n2_tx_frames;
1135         card->wandev.stats.tx_aborted_errors = card->u.x.stats.tx_aborts;
1136         card->wandev.stats.tx_dropped = 0; /* not available from fw */
1137         card->wandev.stats.collisions = 0; /* not available from fw */
1138         card->wandev.stats.tx_errors = 0; /* not available from fw */
1139
1140         cycx_x25_dump_devs(&card->wandev);
1141
1142         return 0;
1143 }
1144
1145 /* return the number of nibbles */
1146 static int byte_to_nibble(u8 *s, u8 *d, char *nibble)
1147 {
1148         int i = 0;
1149
1150         if (*nibble && *s) {
1151                 d[i] |= *s++ - '0';
1152                 *nibble = 0;
1153                 ++i;
1154         }
1155
1156         while (*s) {
1157                 d[i] = (*s - '0') << 4;
1158                 if (*(s + 1))
1159                         d[i] |= *(s + 1) - '0';
1160                 else {
1161                         *nibble = 1;
1162                         break;
1163                 }
1164                 ++i;
1165                 s += 2;
1166         }
1167
1168         return i;
1169 }
1170
1171 static void nibble_to_byte(u8 *s, u8 *d, u8 len, u8 nibble)
1172 {
1173         if (nibble) {
1174                 *d++ = '0' + (*s++ & 0x0F);
1175                 --len;
1176         }
1177
1178         while (len) {
1179                 *d++ = '0' + (*s >> 4);
1180
1181                 if (--len) {
1182                         *d++ = '0' + (*s & 0x0F);
1183                         --len;
1184                 } else break;
1185
1186                 ++s;
1187         }
1188
1189         *d = '\0';
1190 }
1191
1192 /* Place X.25 call. */
1193 static int x25_place_call(struct cycx_device *card,
1194                           struct cycx_x25_channel *chan)
1195 {
1196         int err = 0,
1197             len;
1198         char d[64],
1199              nibble = 0,
1200              mylen = chan->local_addr ? strlen(chan->local_addr) : 0,
1201              remotelen = strlen(chan->addr);
1202         u8 key;
1203
1204         if (card->u.x.connection_keys == ~0U) {
1205                 printk(KERN_INFO "%s: too many simultaneous connection "
1206                                  "requests!\n", card->devname);
1207                 return -EAGAIN;
1208         }
1209
1210         key = ffz(card->u.x.connection_keys);
1211         set_bit(key, (void*)&card->u.x.connection_keys);
1212         ++key;
1213         dprintk(1, KERN_INFO "%s:x25_place_call:key=%d\n", card->devname, key);
1214         memset(d, 0, sizeof(d));
1215         d[1] = key; /* user key */
1216         d[2] = 0x10;
1217         d[4] = 0x0B;
1218
1219         len = byte_to_nibble(chan->addr, d + 6, &nibble);
1220
1221         if (chan->local_addr)
1222                 len += byte_to_nibble(chan->local_addr, d + 6 + len, &nibble);
1223
1224         if (nibble)
1225                 ++len;
1226
1227         d[5] = mylen << 4 | remotelen;
1228         d[6 + len + 1] = 0xCC; /* TCP/IP over X.25, thanks to Daniela :) */
1229
1230         if ((err = x25_exec(card, X25_CONNECT_REQUEST, chan->link,
1231                             &d, 7 + len + 1, NULL, 0)) != 0)
1232                 clear_bit(--key, (void*)&card->u.x.connection_keys);
1233         else
1234                 chan->lcn = -key;
1235
1236         return err;
1237 }
1238
1239 /* Place X.25 CONNECT RESPONSE. */
1240 static int cycx_x25_connect_response(struct cycx_device *card,
1241                                      struct cycx_x25_channel *chan)
1242 {
1243         u8 d[8];
1244
1245         memset(d, 0, sizeof(d));
1246         d[0] = d[3] = chan->lcn;
1247         d[2] = 0x10;
1248         d[4] = 0x0F;
1249         d[7] = 0xCC; /* TCP/IP over X.25, thanks Daniela */
1250
1251         return x25_exec(card, X25_CONNECT_RESPONSE, chan->link, &d, 8, NULL, 0);
1252 }
1253
1254 /* Place X.25 DISCONNECT RESPONSE.  */
1255 static int cycx_x25_disconnect_response(struct cycx_device *card, u8 link,
1256                                         u8 lcn)
1257 {
1258         char d[5];
1259
1260         memset(d, 0, sizeof(d));
1261         d[0] = d[3] = lcn;
1262         d[2] = 0x10;
1263         d[4] = 0x17;
1264
1265         return x25_exec(card, X25_DISCONNECT_RESPONSE, link, &d, 5, NULL, 0);
1266 }
1267
1268 /* Clear X.25 call.  */
1269 static int x25_clear_call(struct cycx_device *card, u8 link, u8 lcn, u8 cause,
1270                           u8 diagn)
1271 {
1272         u8 d[7];
1273
1274         memset(d, 0, sizeof(d));
1275         d[0] = d[3] = lcn;
1276         d[2] = 0x10;
1277         d[4] = 0x13;
1278         d[5] = cause;
1279         d[6] = diagn;
1280
1281         return x25_exec(card, X25_DISCONNECT_REQUEST, link, d, 7, NULL, 0);
1282 }
1283
1284 /* Send X.25 data packet. */
1285 static int cycx_x25_send(struct cycx_device *card, u8 link, u8 lcn, u8 bitm,
1286                          int len, void *buf)
1287 {
1288         u8 d[] = "?\xFF\x10??";
1289
1290         d[0] = d[3] = lcn;
1291         d[4] = bitm;
1292
1293         return x25_exec(card, X25_DATA_REQUEST, link, &d, 5, buf, len);
1294 }
1295
1296 /* Miscellaneous */
1297 /* Find network device by its channel number.  */
1298 static struct net_device *cycx_x25_get_dev_by_lcn(struct wan_device *wandev,
1299                                                   s16 lcn)
1300 {
1301         struct net_device *dev = wandev->dev;
1302         struct cycx_x25_channel *chan;
1303
1304         while (dev) {
1305                 chan = (struct cycx_x25_channel*)dev->priv;
1306
1307                 if (chan->lcn == lcn)
1308                         break;
1309                 dev = chan->slave;
1310         }
1311         return dev;
1312 }
1313
1314 /* Find network device by its remote dte address. */
1315 static struct net_device *
1316         cycx_x25_get_dev_by_dte_addr(struct wan_device *wandev, char *dte)
1317 {
1318         struct net_device *dev = wandev->dev;
1319         struct cycx_x25_channel *chan;
1320
1321         while (dev) {
1322                 chan = (struct cycx_x25_channel*)dev->priv;
1323
1324                 if (!strcmp(chan->addr, dte))
1325                         break;
1326                 dev = chan->slave;
1327         }
1328         return dev;
1329 }
1330
1331 /* Initiate connection on the logical channel.
1332  * o for PVC we just get channel configuration
1333  * o for SVCs place an X.25 call
1334  *
1335  * Return:      0       connected
1336  *              >0      connection in progress
1337  *              <0      failure */
1338 static int cycx_x25_chan_connect(struct net_device *dev)
1339 {
1340         struct cycx_x25_channel *chan = dev->priv;
1341         struct cycx_device *card = chan->card;
1342
1343         if (chan->svc) {
1344                 if (!chan->addr[0])
1345                         return -EINVAL; /* no destination address */
1346
1347                 dprintk(1, KERN_INFO "%s: placing X.25 call to %s...\n",
1348                                   card->devname, chan->addr);
1349
1350                 if (x25_place_call(card, chan))
1351                         return -EIO;
1352
1353                 cycx_x25_set_chan_state(dev, WAN_CONNECTING);
1354                 return 1;
1355         } else
1356                 cycx_x25_set_chan_state(dev, WAN_CONNECTED);
1357
1358         return 0;
1359 }
1360
1361 /* Disconnect logical channel.
1362  * o if SVC then clear X.25 call */
1363 static void cycx_x25_chan_disconnect(struct net_device *dev)
1364 {
1365         struct cycx_x25_channel *chan = dev->priv;
1366
1367         if (chan->svc) {
1368                 x25_clear_call(chan->card, chan->link, chan->lcn, 0, 0);
1369                 cycx_x25_set_chan_state(dev, WAN_DISCONNECTING);
1370         } else
1371                 cycx_x25_set_chan_state(dev, WAN_DISCONNECTED);
1372 }
1373
1374 /* Called by kernel timer */
1375 static void cycx_x25_chan_timer(unsigned long d)
1376 {
1377         struct net_device *dev = (struct net_device *)d;
1378         struct cycx_x25_channel *chan = dev->priv;
1379
1380         if (chan->state == WAN_CONNECTED)
1381                 cycx_x25_chan_disconnect(dev);
1382         else
1383                 printk(KERN_ERR "%s: %s for svc (%s) not connected!\n",
1384                                 chan->card->devname, __func__, dev->name);
1385 }
1386
1387 /* Set logical channel state. */
1388 static void cycx_x25_set_chan_state(struct net_device *dev, u8 state)
1389 {
1390         struct cycx_x25_channel *chan = dev->priv;
1391         struct cycx_device *card = chan->card;
1392         unsigned long flags;
1393         char *string_state = NULL;
1394
1395         spin_lock_irqsave(&card->lock, flags);
1396
1397         if (chan->state != state) {
1398                 if (chan->svc && chan->state == WAN_CONNECTED)
1399                         del_timer(&chan->timer);
1400
1401                 switch (state) {
1402                 case WAN_CONNECTED:
1403                         string_state = "connected!";
1404                         *(__be16*)dev->dev_addr = htons(chan->lcn);
1405                         netif_wake_queue(dev);
1406                         reset_timer(dev);
1407
1408                         if (chan->protocol == ETH_P_X25)
1409                                 cycx_x25_chan_send_event(dev, 1);
1410
1411                         break;
1412                 case WAN_CONNECTING:
1413                         string_state = "connecting...";
1414                         break;
1415                 case WAN_DISCONNECTING:
1416                         string_state = "disconnecting...";
1417                         break;
1418                 case WAN_DISCONNECTED:
1419                         string_state = "disconnected!";
1420
1421                         if (chan->svc) {
1422                                 *(unsigned short*)dev->dev_addr = 0;
1423                                 chan->lcn = 0;
1424                         }
1425
1426                         if (chan->protocol == ETH_P_X25)
1427                                 cycx_x25_chan_send_event(dev, 2);
1428
1429                         netif_wake_queue(dev);
1430                         break;
1431                 }
1432
1433                 printk(KERN_INFO "%s: interface %s %s\n", card->devname,
1434                                   dev->name, string_state);
1435                 chan->state = state;
1436         }
1437
1438         spin_unlock_irqrestore(&card->lock, flags);
1439 }
1440
1441 /* Send packet on a logical channel.
1442  *      When this function is called, tx_skb field of the channel data space
1443  *      points to the transmit socket buffer.  When transmission is complete,
1444  *      release socket buffer and reset 'tbusy' flag.
1445  *
1446  * Return:      0       - transmission complete
1447  *              1       - busy
1448  *
1449  * Notes:
1450  * 1. If packet length is greater than MTU for this channel, we'll fragment
1451  *    the packet into 'complete sequence' using M-bit.
1452  * 2. When transmission is complete, an event notification should be issued
1453  *    to the router.  */
1454 static int cycx_x25_chan_send(struct net_device *dev, struct sk_buff *skb)
1455 {
1456         struct cycx_x25_channel *chan = dev->priv;
1457         struct cycx_device *card = chan->card;
1458         int bitm = 0;           /* final packet */
1459         unsigned len = skb->len;
1460
1461         if (skb->len > card->wandev.mtu) {
1462                 len = card->wandev.mtu;
1463                 bitm = 0x10;            /* set M-bit (more data) */
1464         }
1465
1466         if (cycx_x25_send(card, chan->link, chan->lcn, bitm, len, skb->data))
1467                 return 1;
1468
1469         if (bitm) {
1470                 skb_pull(skb, len);
1471                 return 1;
1472         }
1473
1474         ++chan->ifstats.tx_packets;
1475         chan->ifstats.tx_bytes += len;
1476
1477         return 0;
1478 }
1479
1480 /* Send event (connection, disconnection, etc) to X.25 socket layer */
1481
1482 static void cycx_x25_chan_send_event(struct net_device *dev, u8 event)
1483 {
1484         struct sk_buff *skb;
1485         unsigned char *ptr;
1486
1487         if ((skb = dev_alloc_skb(1)) == NULL) {
1488                 printk(KERN_ERR "%s: out of memory\n", __func__);
1489                 return;
1490         }
1491
1492         ptr  = skb_put(skb, 1);
1493         *ptr = event;
1494
1495         skb->protocol = x25_type_trans(skb, dev);
1496         netif_rx(skb);
1497         dev->last_rx = jiffies;         /* timestamp */
1498 }
1499
1500 /* Convert line speed in bps to a number used by cyclom 2x code. */
1501 static u8 bps_to_speed_code(u32 bps)
1502 {
1503         u8 number = 0; /* defaults to the lowest (1200) speed ;> */
1504
1505              if (bps >= 512000) number = 8;
1506         else if (bps >= 256000) number = 7;
1507         else if (bps >= 64000)  number = 6;
1508         else if (bps >= 38400)  number = 5;
1509         else if (bps >= 19200)  number = 4;
1510         else if (bps >= 9600)   number = 3;
1511         else if (bps >= 4800)   number = 2;
1512         else if (bps >= 2400)   number = 1;
1513
1514         return number;
1515 }
1516
1517 /* log base 2 */
1518 static u8 cycx_log2(u32 n)
1519 {
1520         u8 log = 0;
1521
1522         if (!n)
1523                 return 0;
1524
1525         while (n > 1) {
1526                 n >>= 1;
1527                 ++log;
1528         }
1529
1530         return log;
1531 }
1532
1533 /* Convert decimal string to unsigned integer.
1534  * If len != 0 then only 'len' characters of the string are converted. */
1535 static unsigned dec_to_uint(u8 *str, int len)
1536 {
1537         unsigned val = 0;
1538
1539         if (!len)
1540                 len = strlen(str);
1541
1542         for (; len && isdigit(*str); ++str, --len)
1543                 val = (val * 10) + (*str - (unsigned) '0');
1544
1545         return val;
1546 }
1547
1548 static void reset_timer(struct net_device *dev)
1549 {
1550         struct cycx_x25_channel *chan = dev->priv;
1551
1552         if (chan->svc)
1553                 mod_timer(&chan->timer, jiffies+chan->idle_tmout*HZ);
1554 }
1555 #ifdef CYCLOMX_X25_DEBUG
1556 static void cycx_x25_dump_config(struct cycx_x25_config *conf)
1557 {
1558         printk(KERN_INFO "X.25 configuration\n");
1559         printk(KERN_INFO "-----------------\n");
1560         printk(KERN_INFO "link number=%d\n", conf->link);
1561         printk(KERN_INFO "line speed=%d\n", conf->speed);
1562         printk(KERN_INFO "clock=%sternal\n", conf->clock == 8 ? "Ex" : "In");
1563         printk(KERN_INFO "# level 2 retransm.=%d\n", conf->n2);
1564         printk(KERN_INFO "level 2 window=%d\n", conf->n2win);
1565         printk(KERN_INFO "level 3 window=%d\n", conf->n3win);
1566         printk(KERN_INFO "# logical channels=%d\n", conf->nvc);
1567         printk(KERN_INFO "level 3 pkt len=%d\n", conf->pktlen);
1568         printk(KERN_INFO "my address=%d\n", conf->locaddr);
1569         printk(KERN_INFO "remote address=%d\n", conf->remaddr);
1570         printk(KERN_INFO "t1=%d seconds\n", conf->t1);
1571         printk(KERN_INFO "t2=%d seconds\n", conf->t2);
1572         printk(KERN_INFO "t21=%d seconds\n", conf->t21);
1573         printk(KERN_INFO "# PVCs=%d\n", conf->npvc);
1574         printk(KERN_INFO "t23=%d seconds\n", conf->t23);
1575         printk(KERN_INFO "flags=0x%x\n", conf->flags);
1576 }
1577
1578 static void cycx_x25_dump_stats(struct cycx_x25_stats *stats)
1579 {
1580         printk(KERN_INFO "X.25 statistics\n");
1581         printk(KERN_INFO "--------------\n");
1582         printk(KERN_INFO "rx_crc_errors=%d\n", stats->rx_crc_errors);
1583         printk(KERN_INFO "rx_over_errors=%d\n", stats->rx_over_errors);
1584         printk(KERN_INFO "n2_tx_frames=%d\n", stats->n2_tx_frames);
1585         printk(KERN_INFO "n2_rx_frames=%d\n", stats->n2_rx_frames);
1586         printk(KERN_INFO "tx_timeouts=%d\n", stats->tx_timeouts);
1587         printk(KERN_INFO "rx_timeouts=%d\n", stats->rx_timeouts);
1588         printk(KERN_INFO "n3_tx_packets=%d\n", stats->n3_tx_packets);
1589         printk(KERN_INFO "n3_rx_packets=%d\n", stats->n3_rx_packets);
1590         printk(KERN_INFO "tx_aborts=%d\n", stats->tx_aborts);
1591         printk(KERN_INFO "rx_aborts=%d\n", stats->rx_aborts);
1592 }
1593
1594 static void cycx_x25_dump_devs(struct wan_device *wandev)
1595 {
1596         struct net_device *dev = wandev->dev;
1597
1598         printk(KERN_INFO "X.25 dev states\n");
1599         printk(KERN_INFO "name: addr:           txoff:  protocol:\n");
1600         printk(KERN_INFO "---------------------------------------\n");
1601
1602         while(dev) {
1603                 struct cycx_x25_channel *chan = dev->priv;
1604
1605                 printk(KERN_INFO "%-5.5s %-15.15s   %d     ETH_P_%s\n",
1606                                  chan->name, chan->addr, netif_queue_stopped(dev),
1607                                  chan->protocol == ETH_P_IP ? "IP" : "X25");
1608                 dev = chan->slave;
1609         }
1610 }
1611
1612 #endif /* CYCLOMX_X25_DEBUG */
1613 /* End */