GNU Linux-libre 4.14.324-gnu1
[releases.git] / drivers / s390 / net / ctcm_fsms.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright IBM Corp. 2001, 2007
4  * Authors:     Fritz Elfert (felfert@millenux.com)
5  *              Peter Tiedemann (ptiedem@de.ibm.com)
6  *      MPC additions :
7  *              Belinda Thompson (belindat@us.ibm.com)
8  *              Andy Richter (richtera@us.ibm.com)
9  */
10
11 #undef DEBUG
12 #undef DEBUGDATA
13 #undef DEBUGCCW
14
15 #define KMSG_COMPONENT "ctcm"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/errno.h>
23 #include <linux/types.h>
24 #include <linux/interrupt.h>
25 #include <linux/timer.h>
26 #include <linux/bitops.h>
27
28 #include <linux/signal.h>
29 #include <linux/string.h>
30
31 #include <linux/ip.h>
32 #include <linux/if_arp.h>
33 #include <linux/tcp.h>
34 #include <linux/skbuff.h>
35 #include <linux/ctype.h>
36 #include <net/dst.h>
37
38 #include <linux/io.h>
39 #include <asm/ccwdev.h>
40 #include <asm/ccwgroup.h>
41 #include <linux/uaccess.h>
42
43 #include <asm/idals.h>
44
45 #include "fsm.h"
46
47 #include "ctcm_dbug.h"
48 #include "ctcm_main.h"
49 #include "ctcm_fsms.h"
50
51 const char *dev_state_names[] = {
52         [DEV_STATE_STOPPED]             = "Stopped",
53         [DEV_STATE_STARTWAIT_RXTX]      = "StartWait RXTX",
54         [DEV_STATE_STARTWAIT_RX]        = "StartWait RX",
55         [DEV_STATE_STARTWAIT_TX]        = "StartWait TX",
56         [DEV_STATE_STOPWAIT_RXTX]       = "StopWait RXTX",
57         [DEV_STATE_STOPWAIT_RX]         = "StopWait RX",
58         [DEV_STATE_STOPWAIT_TX]         = "StopWait TX",
59         [DEV_STATE_RUNNING]             = "Running",
60 };
61
62 const char *dev_event_names[] = {
63         [DEV_EVENT_START]       = "Start",
64         [DEV_EVENT_STOP]        = "Stop",
65         [DEV_EVENT_RXUP]        = "RX up",
66         [DEV_EVENT_TXUP]        = "TX up",
67         [DEV_EVENT_RXDOWN]      = "RX down",
68         [DEV_EVENT_TXDOWN]      = "TX down",
69         [DEV_EVENT_RESTART]     = "Restart",
70 };
71
72 const char *ctc_ch_event_names[] = {
73         [CTC_EVENT_IO_SUCCESS]  = "ccw_device success",
74         [CTC_EVENT_IO_EBUSY]    = "ccw_device busy",
75         [CTC_EVENT_IO_ENODEV]   = "ccw_device enodev",
76         [CTC_EVENT_IO_UNKNOWN]  = "ccw_device unknown",
77         [CTC_EVENT_ATTNBUSY]    = "Status ATTN & BUSY",
78         [CTC_EVENT_ATTN]        = "Status ATTN",
79         [CTC_EVENT_BUSY]        = "Status BUSY",
80         [CTC_EVENT_UC_RCRESET]  = "Unit check remote reset",
81         [CTC_EVENT_UC_RSRESET]  = "Unit check remote system reset",
82         [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
83         [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
84         [CTC_EVENT_UC_HWFAIL]   = "Unit check Hardware failure",
85         [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
86         [CTC_EVENT_UC_ZERO]     = "Unit check ZERO",
87         [CTC_EVENT_UC_UNKNOWN]  = "Unit check Unknown",
88         [CTC_EVENT_SC_UNKNOWN]  = "SubChannel check Unknown",
89         [CTC_EVENT_MC_FAIL]     = "Machine check failure",
90         [CTC_EVENT_MC_GOOD]     = "Machine check operational",
91         [CTC_EVENT_IRQ]         = "IRQ normal",
92         [CTC_EVENT_FINSTAT]     = "IRQ final",
93         [CTC_EVENT_TIMER]       = "Timer",
94         [CTC_EVENT_START]       = "Start",
95         [CTC_EVENT_STOP]        = "Stop",
96         /*
97         * additional MPC events
98         */
99         [CTC_EVENT_SEND_XID]    = "XID Exchange",
100         [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
101 };
102
103 const char *ctc_ch_state_names[] = {
104         [CTC_STATE_IDLE]        = "Idle",
105         [CTC_STATE_STOPPED]     = "Stopped",
106         [CTC_STATE_STARTWAIT]   = "StartWait",
107         [CTC_STATE_STARTRETRY]  = "StartRetry",
108         [CTC_STATE_SETUPWAIT]   = "SetupWait",
109         [CTC_STATE_RXINIT]      = "RX init",
110         [CTC_STATE_TXINIT]      = "TX init",
111         [CTC_STATE_RX]          = "RX",
112         [CTC_STATE_TX]          = "TX",
113         [CTC_STATE_RXIDLE]      = "RX idle",
114         [CTC_STATE_TXIDLE]      = "TX idle",
115         [CTC_STATE_RXERR]       = "RX error",
116         [CTC_STATE_TXERR]       = "TX error",
117         [CTC_STATE_TERM]        = "Terminating",
118         [CTC_STATE_DTERM]       = "Restarting",
119         [CTC_STATE_NOTOP]       = "Not operational",
120         /*
121         * additional MPC states
122         */
123         [CH_XID0_PENDING]       = "Pending XID0 Start",
124         [CH_XID0_INPROGRESS]    = "In XID0 Negotiations ",
125         [CH_XID7_PENDING]       = "Pending XID7 P1 Start",
126         [CH_XID7_PENDING1]      = "Active XID7 P1 Exchange ",
127         [CH_XID7_PENDING2]      = "Pending XID7 P2 Start ",
128         [CH_XID7_PENDING3]      = "Active XID7 P2 Exchange ",
129         [CH_XID7_PENDING4]      = "XID7 Complete - Pending READY ",
130 };
131
132 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133
134 /*
135  * ----- static ctcm actions for channel statemachine -----
136  *
137 */
138 static void chx_txdone(fsm_instance *fi, int event, void *arg);
139 static void chx_rx(fsm_instance *fi, int event, void *arg);
140 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141 static void chx_firstio(fsm_instance *fi, int event, void *arg);
142 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156
157 /*
158  * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159  *
160 */
161 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164 /* shared :
165 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179 */
180 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
184
185 /**
186  * Check return code of a preceding ccw_device call, halt_IO etc...
187  *
188  * ch   :       The channel, the error belongs to.
189  * Returns the error code (!= 0) to inspect.
190  */
191 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
192 {
193         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
194                 "%s(%s): %s: %04x\n",
195                 CTCM_FUNTAIL, ch->id, msg, rc);
196         switch (rc) {
197         case -EBUSY:
198                 pr_info("%s: The communication peer is busy\n",
199                         ch->id);
200                 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
201                 break;
202         case -ENODEV:
203                 pr_err("%s: The specified target device is not valid\n",
204                        ch->id);
205                 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
206                 break;
207         default:
208                 pr_err("An I/O operation resulted in error %04x\n",
209                        rc);
210                 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
211         }
212 }
213
214 void ctcm_purge_skb_queue(struct sk_buff_head *q)
215 {
216         struct sk_buff *skb;
217
218         CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
219
220         while ((skb = skb_dequeue(q))) {
221                 refcount_dec(&skb->users);
222                 dev_kfree_skb_any(skb);
223         }
224 }
225
226 /**
227  * NOP action for statemachines
228  */
229 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
230 {
231 }
232
233 /*
234  * Actions for channel - statemachines.
235  */
236
237 /**
238  * Normal data has been send. Free the corresponding
239  * skb (it's in io_queue), reset dev->tbusy and
240  * revert to idle state.
241  *
242  * fi           An instance of a channel statemachine.
243  * event        The event, just happened.
244  * arg          Generic pointer, casted from channel * upon call.
245  */
246 static void chx_txdone(fsm_instance *fi, int event, void *arg)
247 {
248         struct channel *ch = arg;
249         struct net_device *dev = ch->netdev;
250         struct ctcm_priv *priv = dev->ml_priv;
251         struct sk_buff *skb;
252         int first = 1;
253         int i;
254         unsigned long duration;
255         unsigned long done_stamp = jiffies;
256
257         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
258
259         duration = done_stamp - ch->prof.send_stamp;
260         if (duration > ch->prof.tx_time)
261                 ch->prof.tx_time = duration;
262
263         if (ch->irb->scsw.cmd.count != 0)
264                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
265                         "%s(%s): TX not complete, remaining %d bytes",
266                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
267         fsm_deltimer(&ch->timer);
268         while ((skb = skb_dequeue(&ch->io_queue))) {
269                 priv->stats.tx_packets++;
270                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
271                 if (first) {
272                         priv->stats.tx_bytes += 2;
273                         first = 0;
274                 }
275                 refcount_dec(&skb->users);
276                 dev_kfree_skb_irq(skb);
277         }
278         spin_lock(&ch->collect_lock);
279         clear_normalized_cda(&ch->ccw[4]);
280         if (ch->collect_len > 0) {
281                 int rc;
282
283                 if (ctcm_checkalloc_buffer(ch)) {
284                         spin_unlock(&ch->collect_lock);
285                         return;
286                 }
287                 ch->trans_skb->data = ch->trans_skb_data;
288                 skb_reset_tail_pointer(ch->trans_skb);
289                 ch->trans_skb->len = 0;
290                 if (ch->prof.maxmulti < (ch->collect_len + 2))
291                         ch->prof.maxmulti = ch->collect_len + 2;
292                 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
293                         ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
294                 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
295                 i = 0;
296                 while ((skb = skb_dequeue(&ch->collect_queue))) {
297                         skb_copy_from_linear_data(skb,
298                                 skb_put(ch->trans_skb, skb->len), skb->len);
299                         priv->stats.tx_packets++;
300                         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
301                         refcount_dec(&skb->users);
302                         dev_kfree_skb_irq(skb);
303                         i++;
304                 }
305                 ch->collect_len = 0;
306                 spin_unlock(&ch->collect_lock);
307                 ch->ccw[1].count = ch->trans_skb->len;
308                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
309                 ch->prof.send_stamp = jiffies;
310                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
311                                                 (unsigned long)ch, 0xff, 0);
312                 ch->prof.doios_multi++;
313                 if (rc != 0) {
314                         priv->stats.tx_dropped += i;
315                         priv->stats.tx_errors += i;
316                         fsm_deltimer(&ch->timer);
317                         ctcm_ccw_check_rc(ch, rc, "chained TX");
318                 }
319         } else {
320                 spin_unlock(&ch->collect_lock);
321                 fsm_newstate(fi, CTC_STATE_TXIDLE);
322         }
323         ctcm_clear_busy_do(dev);
324 }
325
326 /**
327  * Initial data is sent.
328  * Notify device statemachine that we are up and
329  * running.
330  *
331  * fi           An instance of a channel statemachine.
332  * event        The event, just happened.
333  * arg          Generic pointer, casted from channel * upon call.
334  */
335 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
336 {
337         struct channel *ch = arg;
338         struct net_device *dev = ch->netdev;
339         struct ctcm_priv *priv = dev->ml_priv;
340
341         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
342
343         fsm_deltimer(&ch->timer);
344         fsm_newstate(fi, CTC_STATE_TXIDLE);
345         fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
346 }
347
348 /**
349  * Got normal data, check for sanity, queue it up, allocate new buffer
350  * trigger bottom half, and initiate next read.
351  *
352  * fi           An instance of a channel statemachine.
353  * event        The event, just happened.
354  * arg          Generic pointer, casted from channel * upon call.
355  */
356 static void chx_rx(fsm_instance *fi, int event, void *arg)
357 {
358         struct channel *ch = arg;
359         struct net_device *dev = ch->netdev;
360         struct ctcm_priv *priv = dev->ml_priv;
361         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
362         struct sk_buff *skb = ch->trans_skb;
363         __u16 block_len = *((__u16 *)skb->data);
364         int check_len;
365         int rc;
366
367         fsm_deltimer(&ch->timer);
368         if (len < 8) {
369                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
370                         "%s(%s): got packet with length %d < 8\n",
371                                         CTCM_FUNTAIL, dev->name, len);
372                 priv->stats.rx_dropped++;
373                 priv->stats.rx_length_errors++;
374                                                 goto again;
375         }
376         if (len > ch->max_bufsize) {
377                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
378                         "%s(%s): got packet with length %d > %d\n",
379                                 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
380                 priv->stats.rx_dropped++;
381                 priv->stats.rx_length_errors++;
382                                                 goto again;
383         }
384
385         /*
386          * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
387          */
388         switch (ch->protocol) {
389         case CTCM_PROTO_S390:
390         case CTCM_PROTO_OS390:
391                 check_len = block_len + 2;
392                 break;
393         default:
394                 check_len = block_len;
395                 break;
396         }
397         if ((len < block_len) || (len > check_len)) {
398                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
399                         "%s(%s): got block length %d != rx length %d\n",
400                                 CTCM_FUNTAIL, dev->name, block_len, len);
401                 if (do_debug)
402                         ctcmpc_dump_skb(skb, 0);
403
404                 *((__u16 *)skb->data) = len;
405                 priv->stats.rx_dropped++;
406                 priv->stats.rx_length_errors++;
407                                                 goto again;
408         }
409         if (block_len > 2) {
410                 *((__u16 *)skb->data) = block_len - 2;
411                 ctcm_unpack_skb(ch, skb);
412         }
413  again:
414         skb->data = ch->trans_skb_data;
415         skb_reset_tail_pointer(skb);
416         skb->len = 0;
417         if (ctcm_checkalloc_buffer(ch))
418                 return;
419         ch->ccw[1].count = ch->max_bufsize;
420         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
421                                         (unsigned long)ch, 0xff, 0);
422         if (rc != 0)
423                 ctcm_ccw_check_rc(ch, rc, "normal RX");
424 }
425
426 /**
427  * Initialize connection by sending a __u16 of value 0.
428  *
429  * fi           An instance of a channel statemachine.
430  * event        The event, just happened.
431  * arg          Generic pointer, casted from channel * upon call.
432  */
433 static void chx_firstio(fsm_instance *fi, int event, void *arg)
434 {
435         int rc;
436         struct channel *ch = arg;
437         int fsmstate = fsm_getstate(fi);
438
439         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
440                 "%s(%s) : %02x",
441                 CTCM_FUNTAIL, ch->id, fsmstate);
442
443         ch->sense_rc = 0;       /* reset unit check report control */
444         if (fsmstate == CTC_STATE_TXIDLE)
445                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
446                         "%s(%s): remote side issued READ?, init.\n",
447                                 CTCM_FUNTAIL, ch->id);
448         fsm_deltimer(&ch->timer);
449         if (ctcm_checkalloc_buffer(ch))
450                 return;
451         if ((fsmstate == CTC_STATE_SETUPWAIT) &&
452             (ch->protocol == CTCM_PROTO_OS390)) {
453                 /* OS/390 resp. z/OS */
454                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
455                         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
456                         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
457                                      CTC_EVENT_TIMER, ch);
458                         chx_rxidle(fi, event, arg);
459                 } else {
460                         struct net_device *dev = ch->netdev;
461                         struct ctcm_priv *priv = dev->ml_priv;
462                         fsm_newstate(fi, CTC_STATE_TXIDLE);
463                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
464                 }
465                 return;
466         }
467         /*
468          * Don't setup a timer for receiving the initial RX frame
469          * if in compatibility mode, since VM TCP delays the initial
470          * frame until it has some data to send.
471          */
472         if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
473             (ch->protocol != CTCM_PROTO_S390))
474                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
475
476         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
477         ch->ccw[1].count = 2;   /* Transfer only length */
478
479         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
480                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
481         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
482                                         (unsigned long)ch, 0xff, 0);
483         if (rc != 0) {
484                 fsm_deltimer(&ch->timer);
485                 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
486                 ctcm_ccw_check_rc(ch, rc, "init IO");
487         }
488         /*
489          * If in compatibility mode since we don't setup a timer, we
490          * also signal RX channel up immediately. This enables us
491          * to send packets early which in turn usually triggers some
492          * reply from VM TCP which brings up the RX channel to it's
493          * final state.
494          */
495         if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
496             (ch->protocol == CTCM_PROTO_S390)) {
497                 struct net_device *dev = ch->netdev;
498                 struct ctcm_priv *priv = dev->ml_priv;
499                 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
500         }
501 }
502
503 /**
504  * Got initial data, check it. If OK,
505  * notify device statemachine that we are up and
506  * running.
507  *
508  * fi           An instance of a channel statemachine.
509  * event        The event, just happened.
510  * arg          Generic pointer, casted from channel * upon call.
511  */
512 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
513 {
514         struct channel *ch = arg;
515         struct net_device *dev = ch->netdev;
516         struct ctcm_priv *priv = dev->ml_priv;
517         __u16 buflen;
518         int rc;
519
520         fsm_deltimer(&ch->timer);
521         buflen = *((__u16 *)ch->trans_skb->data);
522         CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
523                         __func__, dev->name, buflen);
524
525         if (buflen >= CTCM_INITIAL_BLOCKLEN) {
526                 if (ctcm_checkalloc_buffer(ch))
527                         return;
528                 ch->ccw[1].count = ch->max_bufsize;
529                 fsm_newstate(fi, CTC_STATE_RXIDLE);
530                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
531                                                 (unsigned long)ch, 0xff, 0);
532                 if (rc != 0) {
533                         fsm_newstate(fi, CTC_STATE_RXINIT);
534                         ctcm_ccw_check_rc(ch, rc, "initial RX");
535                 } else
536                         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
537         } else {
538                 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
539                                 __func__, dev->name,
540                                         buflen, CTCM_INITIAL_BLOCKLEN);
541                 chx_firstio(fi, event, arg);
542         }
543 }
544
545 /**
546  * Set channel into extended mode.
547  *
548  * fi           An instance of a channel statemachine.
549  * event        The event, just happened.
550  * arg          Generic pointer, casted from channel * upon call.
551  */
552 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
553 {
554         struct channel *ch = arg;
555         int rc;
556         unsigned long saveflags = 0;
557         int timeout = CTCM_TIME_5_SEC;
558
559         fsm_deltimer(&ch->timer);
560         if (IS_MPC(ch)) {
561                 timeout = 1500;
562                 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
563                                 __func__, smp_processor_id(), ch, ch->id);
564         }
565         fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
566         fsm_newstate(fi, CTC_STATE_SETUPWAIT);
567         CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
568
569         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
570                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
571                         /* Such conditional locking is undeterministic in
572                          * static view. => ignore sparse warnings here. */
573
574         rc = ccw_device_start(ch->cdev, &ch->ccw[6],
575                                         (unsigned long)ch, 0xff, 0);
576         if (event == CTC_EVENT_TIMER)   /* see above comments */
577                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
578         if (rc != 0) {
579                 fsm_deltimer(&ch->timer);
580                 fsm_newstate(fi, CTC_STATE_STARTWAIT);
581                 ctcm_ccw_check_rc(ch, rc, "set Mode");
582         } else
583                 ch->retry = 0;
584 }
585
586 /**
587  * Setup channel.
588  *
589  * fi           An instance of a channel statemachine.
590  * event        The event, just happened.
591  * arg          Generic pointer, casted from channel * upon call.
592  */
593 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
594 {
595         struct channel *ch      = arg;
596         unsigned long saveflags;
597         int rc;
598
599         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
600                 CTCM_FUNTAIL, ch->id,
601                 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
602
603         if (ch->trans_skb != NULL) {
604                 clear_normalized_cda(&ch->ccw[1]);
605                 dev_kfree_skb(ch->trans_skb);
606                 ch->trans_skb = NULL;
607         }
608         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
609                 ch->ccw[1].cmd_code = CCW_CMD_READ;
610                 ch->ccw[1].flags = CCW_FLAG_SLI;
611                 ch->ccw[1].count = 0;
612         } else {
613                 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
614                 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
615                 ch->ccw[1].count = 0;
616         }
617         if (ctcm_checkalloc_buffer(ch)) {
618                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
619                         "%s(%s): %s trans_skb alloc delayed "
620                         "until first transfer",
621                         CTCM_FUNTAIL, ch->id,
622                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
623                                 "RX" : "TX");
624         }
625         ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
626         ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
627         ch->ccw[0].count = 0;
628         ch->ccw[0].cda = 0;
629         ch->ccw[2].cmd_code = CCW_CMD_NOOP;     /* jointed CE + DE */
630         ch->ccw[2].flags = CCW_FLAG_SLI;
631         ch->ccw[2].count = 0;
632         ch->ccw[2].cda = 0;
633         memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
634         ch->ccw[4].cda = 0;
635         ch->ccw[4].flags &= ~CCW_FLAG_IDA;
636
637         fsm_newstate(fi, CTC_STATE_STARTWAIT);
638         fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
639         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
640         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
641         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
642         if (rc != 0) {
643                 if (rc != -EBUSY)
644                         fsm_deltimer(&ch->timer);
645                 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
646         }
647 }
648
649 /**
650  * Shutdown a channel.
651  *
652  * fi           An instance of a channel statemachine.
653  * event        The event, just happened.
654  * arg          Generic pointer, casted from channel * upon call.
655  */
656 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
657 {
658         struct channel *ch = arg;
659         unsigned long saveflags = 0;
660         int rc;
661         int oldstate;
662
663         fsm_deltimer(&ch->timer);
664         if (IS_MPC(ch))
665                 fsm_deltimer(&ch->sweep_timer);
666
667         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
668
669         if (event == CTC_EVENT_STOP)    /* only for STOP not yet locked */
670                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
671                         /* Such conditional locking is undeterministic in
672                          * static view. => ignore sparse warnings here. */
673         oldstate = fsm_getstate(fi);
674         fsm_newstate(fi, CTC_STATE_TERM);
675         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
676
677         if (event == CTC_EVENT_STOP)
678                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
679                         /* see remark above about conditional locking */
680
681         if (rc != 0 && rc != -EBUSY) {
682                 fsm_deltimer(&ch->timer);
683                 if (event != CTC_EVENT_STOP) {
684                         fsm_newstate(fi, oldstate);
685                         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
686                 }
687         }
688 }
689
690 /**
691  * Cleanup helper for chx_fail and chx_stopped
692  * cleanup channels queue and notify interface statemachine.
693  *
694  * fi           An instance of a channel statemachine.
695  * state        The next state (depending on caller).
696  * ch           The channel to operate on.
697  */
698 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
699                 struct channel *ch)
700 {
701         struct net_device *dev = ch->netdev;
702         struct ctcm_priv *priv = dev->ml_priv;
703
704         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
705                         "%s(%s): %s[%d]\n",
706                         CTCM_FUNTAIL, dev->name, ch->id, state);
707
708         fsm_deltimer(&ch->timer);
709         if (IS_MPC(ch))
710                 fsm_deltimer(&ch->sweep_timer);
711
712         fsm_newstate(fi, state);
713         if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
714                 clear_normalized_cda(&ch->ccw[1]);
715                 dev_kfree_skb_any(ch->trans_skb);
716                 ch->trans_skb = NULL;
717         }
718
719         ch->th_seg = 0x00;
720         ch->th_seq_num = 0x00;
721         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
722                 skb_queue_purge(&ch->io_queue);
723                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
724         } else {
725                 ctcm_purge_skb_queue(&ch->io_queue);
726                 if (IS_MPC(ch))
727                         ctcm_purge_skb_queue(&ch->sweep_queue);
728                 spin_lock(&ch->collect_lock);
729                 ctcm_purge_skb_queue(&ch->collect_queue);
730                 ch->collect_len = 0;
731                 spin_unlock(&ch->collect_lock);
732                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
733         }
734 }
735
736 /**
737  * A channel has successfully been halted.
738  * Cleanup it's queue and notify interface statemachine.
739  *
740  * fi           An instance of a channel statemachine.
741  * event        The event, just happened.
742  * arg          Generic pointer, casted from channel * upon call.
743  */
744 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
745 {
746         ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
747 }
748
749 /**
750  * A stop command from device statemachine arrived and we are in
751  * not operational mode. Set state to stopped.
752  *
753  * fi           An instance of a channel statemachine.
754  * event        The event, just happened.
755  * arg          Generic pointer, casted from channel * upon call.
756  */
757 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
758 {
759         fsm_newstate(fi, CTC_STATE_STOPPED);
760 }
761
762 /**
763  * A machine check for no path, not operational status or gone device has
764  * happened.
765  * Cleanup queue and notify interface statemachine.
766  *
767  * fi           An instance of a channel statemachine.
768  * event        The event, just happened.
769  * arg          Generic pointer, casted from channel * upon call.
770  */
771 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
772 {
773         ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
774 }
775
776 /**
777  * Handle error during setup of channel.
778  *
779  * fi           An instance of a channel statemachine.
780  * event        The event, just happened.
781  * arg          Generic pointer, casted from channel * upon call.
782  */
783 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
784 {
785         struct channel *ch = arg;
786         struct net_device *dev = ch->netdev;
787         struct ctcm_priv *priv = dev->ml_priv;
788
789         /*
790          * Special case: Got UC_RCRESET on setmode.
791          * This means that remote side isn't setup. In this case
792          * simply retry after some 10 secs...
793          */
794         if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
795             ((event == CTC_EVENT_UC_RCRESET) ||
796              (event == CTC_EVENT_UC_RSRESET))) {
797                 fsm_newstate(fi, CTC_STATE_STARTRETRY);
798                 fsm_deltimer(&ch->timer);
799                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
800                 if (!IS_MPC(ch) &&
801                     (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
802                         int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
803                         if (rc != 0)
804                                 ctcm_ccw_check_rc(ch, rc,
805                                         "HaltIO in chx_setuperr");
806                 }
807                 return;
808         }
809
810         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
811                 "%s(%s) : %s error during %s channel setup state=%s\n",
812                 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
813                 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
814                 fsm_getstate_str(fi));
815
816         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
817                 fsm_newstate(fi, CTC_STATE_RXERR);
818                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
819         } else {
820                 fsm_newstate(fi, CTC_STATE_TXERR);
821                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
822         }
823 }
824
825 /**
826  * Restart a channel after an error.
827  *
828  * fi           An instance of a channel statemachine.
829  * event        The event, just happened.
830  * arg          Generic pointer, casted from channel * upon call.
831  */
832 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
833 {
834         struct channel *ch = arg;
835         struct net_device *dev = ch->netdev;
836         unsigned long saveflags = 0;
837         int oldstate;
838         int rc;
839
840         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
841                 "%s: %s[%d] of %s\n",
842                         CTCM_FUNTAIL, ch->id, event, dev->name);
843
844         fsm_deltimer(&ch->timer);
845
846         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
847         oldstate = fsm_getstate(fi);
848         fsm_newstate(fi, CTC_STATE_STARTWAIT);
849         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
850                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
851                         /* Such conditional locking is a known problem for
852                          * sparse because its undeterministic in static view.
853                          * Warnings should be ignored here. */
854         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
855         if (event == CTC_EVENT_TIMER)
856                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
857         if (rc != 0) {
858                 if (rc != -EBUSY) {
859                     fsm_deltimer(&ch->timer);
860                     fsm_newstate(fi, oldstate);
861                 }
862                 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
863         }
864 }
865
866 /**
867  * Handle error during RX initial handshake (exchange of
868  * 0-length block header)
869  *
870  * fi           An instance of a channel statemachine.
871  * event        The event, just happened.
872  * arg          Generic pointer, casted from channel * upon call.
873  */
874 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
875 {
876         struct channel *ch = arg;
877         struct net_device *dev = ch->netdev;
878         struct ctcm_priv *priv = dev->ml_priv;
879
880         if (event == CTC_EVENT_TIMER) {
881                 if (!IS_MPCDEV(dev))
882                         /* TODO : check if MPC deletes timer somewhere */
883                         fsm_deltimer(&ch->timer);
884                 if (ch->retry++ < 3)
885                         ctcm_chx_restart(fi, event, arg);
886                 else {
887                         fsm_newstate(fi, CTC_STATE_RXERR);
888                         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
889                 }
890         } else {
891                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
892                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
893                         ctc_ch_event_names[event], fsm_getstate_str(fi));
894
895                 dev_warn(&dev->dev,
896                         "Initialization failed with RX/TX init handshake "
897                         "error %s\n", ctc_ch_event_names[event]);
898         }
899 }
900
901 /**
902  * Notify device statemachine if we gave up initialization
903  * of RX channel.
904  *
905  * fi           An instance of a channel statemachine.
906  * event        The event, just happened.
907  * arg          Generic pointer, casted from channel * upon call.
908  */
909 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
910 {
911         struct channel *ch = arg;
912         struct net_device *dev = ch->netdev;
913         struct ctcm_priv *priv = dev->ml_priv;
914
915         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
916                         "%s(%s): RX %s busy, init. fail",
917                                 CTCM_FUNTAIL, dev->name, ch->id);
918         fsm_newstate(fi, CTC_STATE_RXERR);
919         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
920 }
921
922 /**
923  * Handle RX Unit check remote reset (remote disconnected)
924  *
925  * fi           An instance of a channel statemachine.
926  * event        The event, just happened.
927  * arg          Generic pointer, casted from channel * upon call.
928  */
929 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
930 {
931         struct channel *ch = arg;
932         struct channel *ch2;
933         struct net_device *dev = ch->netdev;
934         struct ctcm_priv *priv = dev->ml_priv;
935
936         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
937                         "%s: %s: remote disconnect - re-init ...",
938                                 CTCM_FUNTAIL, dev->name);
939         fsm_deltimer(&ch->timer);
940         /*
941          * Notify device statemachine
942          */
943         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
944         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
945
946         fsm_newstate(fi, CTC_STATE_DTERM);
947         ch2 = priv->channel[CTCM_WRITE];
948         fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
949
950         ccw_device_halt(ch->cdev, (unsigned long)ch);
951         ccw_device_halt(ch2->cdev, (unsigned long)ch2);
952 }
953
954 /**
955  * Handle error during TX channel initialization.
956  *
957  * fi           An instance of a channel statemachine.
958  * event        The event, just happened.
959  * arg          Generic pointer, casted from channel * upon call.
960  */
961 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
962 {
963         struct channel *ch = arg;
964         struct net_device *dev = ch->netdev;
965         struct ctcm_priv *priv = dev->ml_priv;
966
967         if (event == CTC_EVENT_TIMER) {
968                 fsm_deltimer(&ch->timer);
969                 if (ch->retry++ < 3)
970                         ctcm_chx_restart(fi, event, arg);
971                 else {
972                         fsm_newstate(fi, CTC_STATE_TXERR);
973                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
974                 }
975         } else {
976                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
977                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
978                         ctc_ch_event_names[event], fsm_getstate_str(fi));
979
980                 dev_warn(&dev->dev,
981                         "Initialization failed with RX/TX init handshake "
982                         "error %s\n", ctc_ch_event_names[event]);
983         }
984 }
985
986 /**
987  * Handle TX timeout by retrying operation.
988  *
989  * fi           An instance of a channel statemachine.
990  * event        The event, just happened.
991  * arg          Generic pointer, casted from channel * upon call.
992  */
993 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
994 {
995         struct channel *ch = arg;
996         struct net_device *dev = ch->netdev;
997         struct ctcm_priv *priv = dev->ml_priv;
998         struct sk_buff *skb;
999
1000         CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1001                         __func__, smp_processor_id(), ch, ch->id);
1002
1003         fsm_deltimer(&ch->timer);
1004         if (ch->retry++ > 3) {
1005                 struct mpc_group *gptr = priv->mpcg;
1006                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1007                                 "%s: %s: retries exceeded",
1008                                         CTCM_FUNTAIL, ch->id);
1009                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1010                 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1011                         use gptr as mpc indicator */
1012                 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1013                         ctcm_chx_restart(fi, event, arg);
1014                                 goto done;
1015         }
1016
1017         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1018                         "%s : %s: retry %d",
1019                                 CTCM_FUNTAIL, ch->id, ch->retry);
1020         skb = skb_peek(&ch->io_queue);
1021         if (skb) {
1022                 int rc = 0;
1023                 unsigned long saveflags = 0;
1024                 clear_normalized_cda(&ch->ccw[4]);
1025                 ch->ccw[4].count = skb->len;
1026                 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1027                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1028                                 "%s: %s: IDAL alloc failed",
1029                                                 CTCM_FUNTAIL, ch->id);
1030                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1031                         ctcm_chx_restart(fi, event, arg);
1032                                 goto done;
1033                 }
1034                 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1035                 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1036                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1037                         /* Such conditional locking is a known problem for
1038                          * sparse because its undeterministic in static view.
1039                          * Warnings should be ignored here. */
1040                 if (do_debug_ccw)
1041                         ctcmpc_dumpit((char *)&ch->ccw[3],
1042                                         sizeof(struct ccw1) * 3);
1043
1044                 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1045                                                 (unsigned long)ch, 0xff, 0);
1046                 if (event == CTC_EVENT_TIMER)
1047                         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1048                                         saveflags);
1049                 if (rc != 0) {
1050                         fsm_deltimer(&ch->timer);
1051                         ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1052                         ctcm_purge_skb_queue(&ch->io_queue);
1053                 }
1054         }
1055 done:
1056         return;
1057 }
1058
1059 /**
1060  * Handle fatal errors during an I/O command.
1061  *
1062  * fi           An instance of a channel statemachine.
1063  * event        The event, just happened.
1064  * arg          Generic pointer, casted from channel * upon call.
1065  */
1066 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1067 {
1068         struct channel *ch = arg;
1069         struct net_device *dev = ch->netdev;
1070         struct ctcm_priv *priv = dev->ml_priv;
1071         int rd = CHANNEL_DIRECTION(ch->flags);
1072
1073         fsm_deltimer(&ch->timer);
1074         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1075                 "%s: %s: %s unrecoverable channel error",
1076                         CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1077
1078         if (IS_MPC(ch)) {
1079                 priv->stats.tx_dropped++;
1080                 priv->stats.tx_errors++;
1081         }
1082         if (rd == CTCM_READ) {
1083                 fsm_newstate(fi, CTC_STATE_RXERR);
1084                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1085         } else {
1086                 fsm_newstate(fi, CTC_STATE_TXERR);
1087                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1088         }
1089 }
1090
1091 /*
1092  * The ctcm statemachine for a channel.
1093  */
1094 const fsm_node ch_fsm[] = {
1095         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1096         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1097         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1098         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1099
1100         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1101         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1102         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1103         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1104         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1105
1106         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1107         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1108         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1109         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1110         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1111         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1112
1113         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1114         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1115         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1116         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1117
1118         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1119         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1120         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      chx_firstio  },
1121         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1122         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1123         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1124         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1125         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1126
1127         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1128         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1129         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      chx_rxidle  },
1130         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1131         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1132         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1133         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1134         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1135         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      chx_firstio  },
1136         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1137
1138         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1139         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1140         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      chx_rx  },
1141         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1142         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1143         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1144         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      chx_rx  },
1145
1146         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1147         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1148         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1149         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1150         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1151         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
1152         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1153         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1154
1155         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1156         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1157         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      chx_firstio  },
1158         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1159         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1160         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1161         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1162
1163         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
1164         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
1165         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
1166         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1167         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1168         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1169
1170         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1171         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
1172         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1173         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1174         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1175         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1176
1177         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
1178         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
1179         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      chx_txdone  },
1180         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_txretry  },
1181         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_txretry  },
1182         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
1183         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1184         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1185
1186         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1187         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1188         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1189         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1190 };
1191
1192 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1193
1194 /*
1195  * MPC actions for mpc channel statemachine
1196  * handling of MPC protocol requires extra
1197  * statemachine and actions which are prefixed ctcmpc_ .
1198  * The ctc_ch_states and ctc_ch_state_names,
1199  * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1200  * which are expanded by some elements.
1201  */
1202
1203 /*
1204  * Actions for mpc channel statemachine.
1205  */
1206
1207 /**
1208  * Normal data has been send. Free the corresponding
1209  * skb (it's in io_queue), reset dev->tbusy and
1210  * revert to idle state.
1211  *
1212  * fi           An instance of a channel statemachine.
1213  * event        The event, just happened.
1214  * arg          Generic pointer, casted from channel * upon call.
1215  */
1216 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1217 {
1218         struct channel          *ch = arg;
1219         struct net_device       *dev = ch->netdev;
1220         struct ctcm_priv        *priv = dev->ml_priv;
1221         struct mpc_group        *grp = priv->mpcg;
1222         struct sk_buff          *skb;
1223         int             first = 1;
1224         int             i;
1225         __u32           data_space;
1226         unsigned long   duration;
1227         struct sk_buff  *peekskb;
1228         int             rc;
1229         struct th_header *header;
1230         struct pdu      *p_header;
1231         unsigned long done_stamp = jiffies;
1232
1233         CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1234                         __func__, dev->name, smp_processor_id());
1235
1236         duration = done_stamp - ch->prof.send_stamp;
1237         if (duration > ch->prof.tx_time)
1238                 ch->prof.tx_time = duration;
1239
1240         if (ch->irb->scsw.cmd.count != 0)
1241                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1242                         "%s(%s): TX not complete, remaining %d bytes",
1243                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1244         fsm_deltimer(&ch->timer);
1245         while ((skb = skb_dequeue(&ch->io_queue))) {
1246                 priv->stats.tx_packets++;
1247                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1248                 if (first) {
1249                         priv->stats.tx_bytes += 2;
1250                         first = 0;
1251                 }
1252                 refcount_dec(&skb->users);
1253                 dev_kfree_skb_irq(skb);
1254         }
1255         spin_lock(&ch->collect_lock);
1256         clear_normalized_cda(&ch->ccw[4]);
1257         if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1258                 spin_unlock(&ch->collect_lock);
1259                 fsm_newstate(fi, CTC_STATE_TXIDLE);
1260                                 goto done;
1261         }
1262
1263         if (ctcm_checkalloc_buffer(ch)) {
1264                 spin_unlock(&ch->collect_lock);
1265                                 goto done;
1266         }
1267         ch->trans_skb->data = ch->trans_skb_data;
1268         skb_reset_tail_pointer(ch->trans_skb);
1269         ch->trans_skb->len = 0;
1270         if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1271                 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1272         if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1273                 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1274         i = 0;
1275         p_header = NULL;
1276         data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1277
1278         CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1279                        " data_space:%04x\n",
1280                        __func__, data_space);
1281
1282         while ((skb = skb_dequeue(&ch->collect_queue))) {
1283                 skb_put_data(ch->trans_skb, skb->data, skb->len);
1284                 p_header = (struct pdu *)
1285                         (skb_tail_pointer(ch->trans_skb) - skb->len);
1286                 p_header->pdu_flag = 0x00;
1287                 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
1288                         p_header->pdu_flag |= 0x60;
1289                 else
1290                         p_header->pdu_flag |= 0x20;
1291
1292                 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1293                                 __func__, ch->trans_skb->len);
1294                 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1295                                 " to 32 bytes sent to vtam\n", __func__);
1296                 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1297
1298                 ch->collect_len -= skb->len;
1299                 data_space -= skb->len;
1300                 priv->stats.tx_packets++;
1301                 priv->stats.tx_bytes += skb->len;
1302                 refcount_dec(&skb->users);
1303                 dev_kfree_skb_any(skb);
1304                 peekskb = skb_peek(&ch->collect_queue);
1305                 if (peekskb->len > data_space)
1306                         break;
1307                 i++;
1308         }
1309         /* p_header points to the last one we handled */
1310         if (p_header)
1311                 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1312         header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1313         if (!header) {
1314                 spin_unlock(&ch->collect_lock);
1315                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1316                                 goto done;
1317         }
1318         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
1319         ch->th_seq_num++;
1320         header->th_seq_num = ch->th_seq_num;
1321
1322         CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1323                                         __func__, ch->th_seq_num);
1324
1325         memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1326                 TH_HEADER_LENGTH);      /* put the TH on the packet */
1327
1328         kfree(header);
1329
1330         CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1331                        __func__, ch->trans_skb->len);
1332         CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1333                         "data to vtam from collect_q\n", __func__);
1334         CTCM_D3_DUMP((char *)ch->trans_skb->data,
1335                                 min_t(int, ch->trans_skb->len, 50));
1336
1337         spin_unlock(&ch->collect_lock);
1338         clear_normalized_cda(&ch->ccw[1]);
1339
1340         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1341                         (void *)(unsigned long)ch->ccw[1].cda,
1342                         ch->trans_skb->data);
1343         ch->ccw[1].count = ch->max_bufsize;
1344
1345         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1346                 dev_kfree_skb_any(ch->trans_skb);
1347                 ch->trans_skb = NULL;
1348                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1349                         "%s: %s: IDAL alloc failed",
1350                                 CTCM_FUNTAIL, ch->id);
1351                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1352                 return;
1353         }
1354
1355         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1356                         (void *)(unsigned long)ch->ccw[1].cda,
1357                         ch->trans_skb->data);
1358
1359         ch->ccw[1].count = ch->trans_skb->len;
1360         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1361         ch->prof.send_stamp = jiffies;
1362         if (do_debug_ccw)
1363                 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1364         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1365                                         (unsigned long)ch, 0xff, 0);
1366         ch->prof.doios_multi++;
1367         if (rc != 0) {
1368                 priv->stats.tx_dropped += i;
1369                 priv->stats.tx_errors += i;
1370                 fsm_deltimer(&ch->timer);
1371                 ctcm_ccw_check_rc(ch, rc, "chained TX");
1372         }
1373 done:
1374         ctcm_clear_busy(dev);
1375         return;
1376 }
1377
1378 /**
1379  * Got normal data, check for sanity, queue it up, allocate new buffer
1380  * trigger bottom half, and initiate next read.
1381  *
1382  * fi           An instance of a channel statemachine.
1383  * event        The event, just happened.
1384  * arg          Generic pointer, casted from channel * upon call.
1385  */
1386 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1387 {
1388         struct channel          *ch = arg;
1389         struct net_device       *dev = ch->netdev;
1390         struct ctcm_priv        *priv = dev->ml_priv;
1391         struct mpc_group        *grp = priv->mpcg;
1392         struct sk_buff          *skb = ch->trans_skb;
1393         struct sk_buff          *new_skb;
1394         unsigned long           saveflags = 0;  /* avoids compiler warning */
1395         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1396
1397         CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1398                         CTCM_FUNTAIL, dev->name, smp_processor_id(),
1399                                 ch->id, ch->max_bufsize, len);
1400         fsm_deltimer(&ch->timer);
1401
1402         if (skb == NULL) {
1403                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1404                         "%s(%s): TRANS_SKB = NULL",
1405                                 CTCM_FUNTAIL, dev->name);
1406                         goto again;
1407         }
1408
1409         if (len < TH_HEADER_LENGTH) {
1410                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1411                                 "%s(%s): packet length %d to short",
1412                                         CTCM_FUNTAIL, dev->name, len);
1413                 priv->stats.rx_dropped++;
1414                 priv->stats.rx_length_errors++;
1415         } else {
1416                 /* must have valid th header or game over */
1417                 __u32   block_len = len;
1418                 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1419                 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1420
1421                 if (new_skb == NULL) {
1422                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1423                                 "%s(%d): skb allocation failed",
1424                                                 CTCM_FUNTAIL, dev->name);
1425                         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1426                                         goto again;
1427                 }
1428                 switch (fsm_getstate(grp->fsm)) {
1429                 case MPCG_STATE_RESET:
1430                 case MPCG_STATE_INOP:
1431                         dev_kfree_skb_any(new_skb);
1432                         break;
1433                 case MPCG_STATE_FLOWC:
1434                 case MPCG_STATE_READY:
1435                         skb_put_data(new_skb, skb->data, block_len);
1436                         skb_queue_tail(&ch->io_queue, new_skb);
1437                         tasklet_schedule(&ch->ch_tasklet);
1438                         break;
1439                 default:
1440                         skb_put_data(new_skb, skb->data, len);
1441                         skb_queue_tail(&ch->io_queue, new_skb);
1442                         tasklet_hi_schedule(&ch->ch_tasklet);
1443                         break;
1444                 }
1445         }
1446
1447 again:
1448         switch (fsm_getstate(grp->fsm)) {
1449         int rc, dolock;
1450         case MPCG_STATE_FLOWC:
1451         case MPCG_STATE_READY:
1452                 if (ctcm_checkalloc_buffer(ch))
1453                         break;
1454                 ch->trans_skb->data = ch->trans_skb_data;
1455                 skb_reset_tail_pointer(ch->trans_skb);
1456                 ch->trans_skb->len = 0;
1457                 ch->ccw[1].count = ch->max_bufsize;
1458                         if (do_debug_ccw)
1459                         ctcmpc_dumpit((char *)&ch->ccw[0],
1460                                         sizeof(struct ccw1) * 3);
1461                 dolock = !in_irq();
1462                 if (dolock)
1463                         spin_lock_irqsave(
1464                                 get_ccwdev_lock(ch->cdev), saveflags);
1465                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1466                                                 (unsigned long)ch, 0xff, 0);
1467                 if (dolock) /* see remark about conditional locking */
1468                         spin_unlock_irqrestore(
1469                                 get_ccwdev_lock(ch->cdev), saveflags);
1470                 if (rc != 0)
1471                         ctcm_ccw_check_rc(ch, rc, "normal RX");
1472         default:
1473                 break;
1474         }
1475
1476         CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1477                         __func__, dev->name, ch, ch->id);
1478
1479 }
1480
1481 /**
1482  * Initialize connection by sending a __u16 of value 0.
1483  *
1484  * fi           An instance of a channel statemachine.
1485  * event        The event, just happened.
1486  * arg          Generic pointer, casted from channel * upon call.
1487  */
1488 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1489 {
1490         struct channel          *ch = arg;
1491         struct net_device       *dev = ch->netdev;
1492         struct ctcm_priv        *priv = dev->ml_priv;
1493         struct mpc_group        *gptr = priv->mpcg;
1494
1495         CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1496                                 __func__, ch->id, ch);
1497
1498         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1499                         "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1500                         CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1501                         fsm_getstate(gptr->fsm), ch->protocol);
1502
1503         if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1504                 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1505
1506         fsm_deltimer(&ch->timer);
1507         if (ctcm_checkalloc_buffer(ch))
1508                                 goto done;
1509
1510         switch (fsm_getstate(fi)) {
1511         case CTC_STATE_STARTRETRY:
1512         case CTC_STATE_SETUPWAIT:
1513                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1514                         ctcmpc_chx_rxidle(fi, event, arg);
1515                 } else {
1516                         fsm_newstate(fi, CTC_STATE_TXIDLE);
1517                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1518                 }
1519                                 goto done;
1520         default:
1521                 break;
1522         }
1523
1524         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1525                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1526
1527 done:
1528         CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1529                                 __func__, ch->id, ch);
1530         return;
1531 }
1532
1533 /**
1534  * Got initial data, check it. If OK,
1535  * notify device statemachine that we are up and
1536  * running.
1537  *
1538  * fi           An instance of a channel statemachine.
1539  * event        The event, just happened.
1540  * arg          Generic pointer, casted from channel * upon call.
1541  */
1542 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1543 {
1544         struct channel *ch = arg;
1545         struct net_device *dev = ch->netdev;
1546         struct ctcm_priv  *priv = dev->ml_priv;
1547         struct mpc_group  *grp = priv->mpcg;
1548         int rc;
1549         unsigned long saveflags = 0;    /* avoids compiler warning */
1550
1551         fsm_deltimer(&ch->timer);
1552         CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1553                         __func__, ch->id, dev->name, smp_processor_id(),
1554                                 fsm_getstate(fi), fsm_getstate(grp->fsm));
1555
1556         fsm_newstate(fi, CTC_STATE_RXIDLE);
1557         /* XID processing complete */
1558
1559         switch (fsm_getstate(grp->fsm)) {
1560         case MPCG_STATE_FLOWC:
1561         case MPCG_STATE_READY:
1562                 if (ctcm_checkalloc_buffer(ch))
1563                                 goto done;
1564                 ch->trans_skb->data = ch->trans_skb_data;
1565                 skb_reset_tail_pointer(ch->trans_skb);
1566                 ch->trans_skb->len = 0;
1567                 ch->ccw[1].count = ch->max_bufsize;
1568                 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1569                 if (event == CTC_EVENT_START)
1570                         /* see remark about conditional locking */
1571                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1572                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1573                                                 (unsigned long)ch, 0xff, 0);
1574                 if (event == CTC_EVENT_START)
1575                         spin_unlock_irqrestore(
1576                                         get_ccwdev_lock(ch->cdev), saveflags);
1577                 if (rc != 0) {
1578                         fsm_newstate(fi, CTC_STATE_RXINIT);
1579                         ctcm_ccw_check_rc(ch, rc, "initial RX");
1580                                 goto done;
1581                 }
1582                 break;
1583         default:
1584                 break;
1585         }
1586
1587         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1588 done:
1589         return;
1590 }
1591
1592 /*
1593  * ctcmpc channel FSM action
1594  * called from several points in ctcmpc_ch_fsm
1595  * ctcmpc only
1596  */
1597 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1598 {
1599         struct channel    *ch     = arg;
1600         struct net_device *dev    = ch->netdev;
1601         struct ctcm_priv  *priv   = dev->ml_priv;
1602         struct mpc_group  *grp = priv->mpcg;
1603
1604         CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1605                 __func__, dev->name, ch->id, ch, smp_processor_id(),
1606                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1607
1608         switch (fsm_getstate(grp->fsm)) {
1609         case MPCG_STATE_XID2INITW:
1610                 /* ok..start yside xid exchanges */
1611                 if (!ch->in_mpcgroup)
1612                         break;
1613                 if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
1614                         fsm_deltimer(&grp->timer);
1615                         fsm_addtimer(&grp->timer,
1616                                 MPC_XID_TIMEOUT_VALUE,
1617                                 MPCG_EVENT_TIMER, dev);
1618                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1619
1620                 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1621                         /* attn rcvd before xid0 processed via bh */
1622                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1623                 break;
1624         case MPCG_STATE_XID2INITX:
1625         case MPCG_STATE_XID0IOWAIT:
1626         case MPCG_STATE_XID0IOWAIX:
1627                 /* attn rcvd before xid0 processed on ch
1628                 but mid-xid0 processing for group    */
1629                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1630                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1631                 break;
1632         case MPCG_STATE_XID7INITW:
1633         case MPCG_STATE_XID7INITX:
1634         case MPCG_STATE_XID7INITI:
1635         case MPCG_STATE_XID7INITZ:
1636                 switch (fsm_getstate(ch->fsm)) {
1637                 case CH_XID7_PENDING:
1638                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1639                         break;
1640                 case CH_XID7_PENDING2:
1641                         fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1642                         break;
1643                 }
1644                 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1645                 break;
1646         }
1647
1648         return;
1649 }
1650
1651 /*
1652  * ctcmpc channel FSM action
1653  * called from one point in ctcmpc_ch_fsm
1654  * ctcmpc only
1655  */
1656 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1657 {
1658         struct channel    *ch     = arg;
1659         struct net_device *dev    = ch->netdev;
1660         struct ctcm_priv  *priv   = dev->ml_priv;
1661         struct mpc_group  *grp    = priv->mpcg;
1662
1663         CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
1664                         __func__, dev->name, ch->id,
1665                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1666
1667         fsm_deltimer(&ch->timer);
1668
1669         switch (fsm_getstate(grp->fsm)) {
1670         case MPCG_STATE_XID0IOWAIT:
1671                 /* vtam wants to be primary.start yside xid exchanges*/
1672                 /* only receive one attn-busy at a time so must not  */
1673                 /* change state each time                            */
1674                 grp->changed_side = 1;
1675                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1676                 break;
1677         case MPCG_STATE_XID2INITW:
1678                 if (grp->changed_side == 1) {
1679                         grp->changed_side = 2;
1680                         break;
1681                 }
1682                 /* process began via call to establish_conn      */
1683                 /* so must report failure instead of reverting   */
1684                 /* back to ready-for-xid passive state           */
1685                 if (grp->estconnfunc)
1686                                 goto done;
1687                 /* this attnbusy is NOT the result of xside xid  */
1688                 /* collisions so yside must have been triggered  */
1689                 /* by an ATTN that was not intended to start XID */
1690                 /* processing. Revert back to ready-for-xid and  */
1691                 /* wait for ATTN interrupt to signal xid start   */
1692                 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1693                         fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1694                         fsm_deltimer(&grp->timer);
1695                                 goto done;
1696                 }
1697                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1698                                 goto done;
1699         case MPCG_STATE_XID2INITX:
1700                 /* XID2 was received before ATTN Busy for second
1701                    channel.Send yside xid for second channel.
1702                 */
1703                 if (grp->changed_side == 1) {
1704                         grp->changed_side = 2;
1705                         break;
1706                 }
1707         case MPCG_STATE_XID0IOWAIX:
1708         case MPCG_STATE_XID7INITW:
1709         case MPCG_STATE_XID7INITX:
1710         case MPCG_STATE_XID7INITI:
1711         case MPCG_STATE_XID7INITZ:
1712         default:
1713                 /* multiple attn-busy indicates too out-of-sync      */
1714                 /* and they are certainly not being received as part */
1715                 /* of valid mpc group negotiations..                 */
1716                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1717                                 goto done;
1718         }
1719
1720         if (grp->changed_side == 1) {
1721                 fsm_deltimer(&grp->timer);
1722                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1723                              MPCG_EVENT_TIMER, dev);
1724         }
1725         if (ch->in_mpcgroup)
1726                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1727         else
1728                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1729                         "%s(%s): channel %s not added to group",
1730                                 CTCM_FUNTAIL, dev->name, ch->id);
1731
1732 done:
1733         return;
1734 }
1735
1736 /*
1737  * ctcmpc channel FSM action
1738  * called from several points in ctcmpc_ch_fsm
1739  * ctcmpc only
1740  */
1741 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1742 {
1743         struct channel     *ch     = arg;
1744         struct net_device  *dev    = ch->netdev;
1745         struct ctcm_priv   *priv   = dev->ml_priv;
1746         struct mpc_group   *grp    = priv->mpcg;
1747
1748         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1749         return;
1750 }
1751
1752 /*
1753  * ctcmpc channel FSM action
1754  * called from several points in ctcmpc_ch_fsm
1755  * ctcmpc only
1756  */
1757 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1758 {
1759         struct channel *ach = arg;
1760         struct net_device *dev = ach->netdev;
1761         struct ctcm_priv *priv = dev->ml_priv;
1762         struct mpc_group *grp = priv->mpcg;
1763         struct channel *wch = priv->channel[CTCM_WRITE];
1764         struct channel *rch = priv->channel[CTCM_READ];
1765         struct sk_buff *skb;
1766         struct th_sweep *header;
1767         int rc = 0;
1768         unsigned long saveflags = 0;
1769
1770         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1771                         __func__, smp_processor_id(), ach, ach->id);
1772
1773         if (grp->in_sweep == 0)
1774                                 goto done;
1775
1776         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1777                                 __func__, wch->th_seq_num);
1778         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1779                                 __func__, rch->th_seq_num);
1780
1781         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1782                 /* give the previous IO time to complete */
1783                 fsm_addtimer(&wch->sweep_timer,
1784                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1785                                 goto done;
1786         }
1787
1788         skb = skb_dequeue(&wch->sweep_queue);
1789         if (!skb)
1790                                 goto done;
1791
1792         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1793                 grp->in_sweep = 0;
1794                 ctcm_clear_busy_do(dev);
1795                 dev_kfree_skb_any(skb);
1796                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1797                                 goto done;
1798         } else {
1799                 refcount_inc(&skb->users);
1800                 skb_queue_tail(&wch->io_queue, skb);
1801         }
1802
1803         /* send out the sweep */
1804         wch->ccw[4].count = skb->len;
1805
1806         header = (struct th_sweep *)skb->data;
1807         switch (header->th.th_ch_flag) {
1808         case TH_SWEEP_REQ:
1809                 grp->sweep_req_pend_num--;
1810                 break;
1811         case TH_SWEEP_RESP:
1812                 grp->sweep_rsp_pend_num--;
1813                 break;
1814         }
1815
1816         header->sw.th_last_seq = wch->th_seq_num;
1817
1818         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1819         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1820         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1821
1822         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1823         fsm_newstate(wch->fsm, CTC_STATE_TX);
1824
1825         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1826         wch->prof.send_stamp = jiffies;
1827         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1828                                         (unsigned long) wch, 0xff, 0);
1829         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1830
1831         if ((grp->sweep_req_pend_num == 0) &&
1832            (grp->sweep_rsp_pend_num == 0)) {
1833                 grp->in_sweep = 0;
1834                 rch->th_seq_num = 0x00;
1835                 wch->th_seq_num = 0x00;
1836                 ctcm_clear_busy_do(dev);
1837         }
1838
1839         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1840                         __func__, wch->th_seq_num, rch->th_seq_num);
1841
1842         if (rc != 0)
1843                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1844
1845 done:
1846         return;
1847 }
1848
1849
1850 /*
1851  * The ctcmpc statemachine for a channel.
1852  */
1853
1854 const fsm_node ctcmpc_ch_fsm[] = {
1855         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1856         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1857         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1858         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1859         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1860
1861         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1862         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1863         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1864         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1865         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1866         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1867         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1868         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1869
1870         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1871         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1872         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1873         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1874         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1875         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1876
1877         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1878         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1879         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1880         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1881         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1882
1883         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1884         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1885         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1886         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1887         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1888         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1889         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1890         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1891
1892         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1893         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1894         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1895         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1896         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1897         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1898         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1899         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1900         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1901         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1902
1903         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1904         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1905         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1906         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1907         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1908         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1909         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1910         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1911         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1912         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1913
1914         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1915         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1916         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1917         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1918         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1919         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1920         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1921         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1922         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1923         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1924         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1925
1926         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1927         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1928         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1929         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1930         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1931         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1932         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1933         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1934         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1935         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1936         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1937         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1938         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1939
1940         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1941         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1942         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1943         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1944         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1945         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1946         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1947         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1948         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1949         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1950         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1951         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1952
1953         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1954         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1955         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1956         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1957         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1958         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1959         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1960         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1961         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1962         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1963         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1964         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1965
1966         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1967         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1968         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1969         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1970         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1971         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1972         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1973         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1974         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1975         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1976         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1977         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1978
1979         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1980         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1981         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1982         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1983         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1984         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1985         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1986         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1987         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1988         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1989         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1990         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1991
1992         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1993         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1994         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1995         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1996         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
1997         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1998         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1999         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
2000
2001         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2002         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
2003         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
2004         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
2005         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
2006         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2007         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2008         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2009         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2010
2011         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2012         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2013         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2014         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2015         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2016         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2017         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2018         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2019
2020         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2021         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2022         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2023         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2024         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2025         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2026         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2027         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2028
2029         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2030         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2031         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2032         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2033         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2034         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2035         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2036
2037         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2038         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2039         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2040         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2041         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2042         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2043         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2044         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2045         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2046         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2047
2048         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2049         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2050         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2051         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2052         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2053 };
2054
2055 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2056
2057 /*
2058  * Actions for interface - statemachine.
2059  */
2060
2061 /**
2062  * Startup channels by sending CTC_EVENT_START to each channel.
2063  *
2064  * fi           An instance of an interface statemachine.
2065  * event        The event, just happened.
2066  * arg          Generic pointer, casted from struct net_device * upon call.
2067  */
2068 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2069 {
2070         struct net_device *dev = arg;
2071         struct ctcm_priv *priv = dev->ml_priv;
2072         int direction;
2073
2074         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2075
2076         fsm_deltimer(&priv->restart_timer);
2077         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2078         if (IS_MPC(priv))
2079                 priv->mpcg->channels_terminating = 0;
2080         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2081                 struct channel *ch = priv->channel[direction];
2082                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2083         }
2084 }
2085
2086 /**
2087  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2088  *
2089  * fi           An instance of an interface statemachine.
2090  * event        The event, just happened.
2091  * arg          Generic pointer, casted from struct net_device * upon call.
2092  */
2093 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2094 {
2095         int direction;
2096         struct net_device *dev = arg;
2097         struct ctcm_priv *priv = dev->ml_priv;
2098
2099         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2100
2101         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2102         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2103                 struct channel *ch = priv->channel[direction];
2104                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2105                 ch->th_seq_num = 0x00;
2106                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2107                                 __func__, ch->th_seq_num);
2108         }
2109         if (IS_MPC(priv))
2110                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2111 }
2112
2113 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2114 {
2115         int restart_timer;
2116         struct net_device *dev = arg;
2117         struct ctcm_priv *priv = dev->ml_priv;
2118
2119         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2120
2121         if (IS_MPC(priv)) {
2122                 restart_timer = CTCM_TIME_1_SEC;
2123         } else {
2124                 restart_timer = CTCM_TIME_5_SEC;
2125         }
2126         dev_info(&dev->dev, "Restarting device\n");
2127
2128         dev_action_stop(fi, event, arg);
2129         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2130         if (IS_MPC(priv))
2131                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2132
2133         /* going back into start sequence too quickly can         */
2134         /* result in the other side becoming unreachable   due    */
2135         /* to sense reported when IO is aborted                   */
2136         fsm_addtimer(&priv->restart_timer, restart_timer,
2137                         DEV_EVENT_START, dev);
2138 }
2139
2140 /**
2141  * Called from channel statemachine
2142  * when a channel is up and running.
2143  *
2144  * fi           An instance of an interface statemachine.
2145  * event        The event, just happened.
2146  * arg          Generic pointer, casted from struct net_device * upon call.
2147  */
2148 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2149 {
2150         struct net_device *dev = arg;
2151         struct ctcm_priv *priv = dev->ml_priv;
2152         int dev_stat = fsm_getstate(fi);
2153
2154         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2155                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2156                                 dev->name, dev->ml_priv, dev_stat, event);
2157
2158         switch (fsm_getstate(fi)) {
2159         case DEV_STATE_STARTWAIT_RXTX:
2160                 if (event == DEV_EVENT_RXUP)
2161                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2162                 else
2163                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2164                 break;
2165         case DEV_STATE_STARTWAIT_RX:
2166                 if (event == DEV_EVENT_RXUP) {
2167                         fsm_newstate(fi, DEV_STATE_RUNNING);
2168                         dev_info(&dev->dev,
2169                                 "Connected with remote side\n");
2170                         ctcm_clear_busy(dev);
2171                 }
2172                 break;
2173         case DEV_STATE_STARTWAIT_TX:
2174                 if (event == DEV_EVENT_TXUP) {
2175                         fsm_newstate(fi, DEV_STATE_RUNNING);
2176                         dev_info(&dev->dev,
2177                                 "Connected with remote side\n");
2178                         ctcm_clear_busy(dev);
2179                 }
2180                 break;
2181         case DEV_STATE_STOPWAIT_TX:
2182                 if (event == DEV_EVENT_RXUP)
2183                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2184                 break;
2185         case DEV_STATE_STOPWAIT_RX:
2186                 if (event == DEV_EVENT_TXUP)
2187                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188                 break;
2189         }
2190
2191         if (IS_MPC(priv)) {
2192                 if (event == DEV_EVENT_RXUP)
2193                         mpc_channel_action(priv->channel[CTCM_READ],
2194                                 CTCM_READ, MPC_CHANNEL_ADD);
2195                 else
2196                         mpc_channel_action(priv->channel[CTCM_WRITE],
2197                                 CTCM_WRITE, MPC_CHANNEL_ADD);
2198         }
2199 }
2200
2201 /**
2202  * Called from device statemachine
2203  * when a channel has been shutdown.
2204  *
2205  * fi           An instance of an interface statemachine.
2206  * event        The event, just happened.
2207  * arg          Generic pointer, casted from struct net_device * upon call.
2208  */
2209 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2210 {
2211
2212         struct net_device *dev = arg;
2213         struct ctcm_priv *priv = dev->ml_priv;
2214
2215         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2216
2217         switch (fsm_getstate(fi)) {
2218         case DEV_STATE_RUNNING:
2219                 if (event == DEV_EVENT_TXDOWN)
2220                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2221                 else
2222                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2223                 break;
2224         case DEV_STATE_STARTWAIT_RX:
2225                 if (event == DEV_EVENT_TXDOWN)
2226                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2227                 break;
2228         case DEV_STATE_STARTWAIT_TX:
2229                 if (event == DEV_EVENT_RXDOWN)
2230                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231                 break;
2232         case DEV_STATE_STOPWAIT_RXTX:
2233                 if (event == DEV_EVENT_TXDOWN)
2234                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2235                 else
2236                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2237                 break;
2238         case DEV_STATE_STOPWAIT_RX:
2239                 if (event == DEV_EVENT_RXDOWN)
2240                         fsm_newstate(fi, DEV_STATE_STOPPED);
2241                 break;
2242         case DEV_STATE_STOPWAIT_TX:
2243                 if (event == DEV_EVENT_TXDOWN)
2244                         fsm_newstate(fi, DEV_STATE_STOPPED);
2245                 break;
2246         }
2247         if (IS_MPC(priv)) {
2248                 if (event == DEV_EVENT_RXDOWN)
2249                         mpc_channel_action(priv->channel[CTCM_READ],
2250                                 CTCM_READ, MPC_CHANNEL_REMOVE);
2251                 else
2252                         mpc_channel_action(priv->channel[CTCM_WRITE],
2253                                 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2254         }
2255 }
2256
2257 const fsm_node dev_fsm[] = {
2258         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2259         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2260         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2261         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2262         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2263         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2264         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2265         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2266         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2267         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2268         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2269         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2270         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2271         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2272         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2273         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2274         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2275         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2276         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2277         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2278         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2279         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2280         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2281         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2282         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2283         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2284         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2285         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2286         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2287         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2288         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2289         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2290         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2291         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2292         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2293         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2294         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2295 };
2296
2297 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2298
2299 /* --- This is the END my friend --- */
2300