Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.git] / drivers / s390 / net / ctcm_fsms.c
1 /*
2  * drivers/s390/net/ctcm_fsms.c
3  *
4  * Copyright IBM Corp. 2001, 2007
5  * Authors:     Fritz Elfert (felfert@millenux.com)
6  *              Peter Tiedemann (ptiedem@de.ibm.com)
7  *      MPC additions :
8  *              Belinda Thompson (belindat@us.ibm.com)
9  *              Andy Richter (richtera@us.ibm.com)
10  */
11
12 #undef DEBUG
13 #undef DEBUGDATA
14 #undef DEBUGCCW
15
16 #define KMSG_COMPONENT "ctcm"
17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19 #include <linux/module.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/slab.h>
23 #include <linux/errno.h>
24 #include <linux/types.h>
25 #include <linux/interrupt.h>
26 #include <linux/timer.h>
27 #include <linux/bitops.h>
28
29 #include <linux/signal.h>
30 #include <linux/string.h>
31
32 #include <linux/ip.h>
33 #include <linux/if_arp.h>
34 #include <linux/tcp.h>
35 #include <linux/skbuff.h>
36 #include <linux/ctype.h>
37 #include <net/dst.h>
38
39 #include <linux/io.h>
40 #include <asm/ccwdev.h>
41 #include <asm/ccwgroup.h>
42 #include <linux/uaccess.h>
43
44 #include <asm/idals.h>
45
46 #include "fsm.h"
47
48 #include "ctcm_dbug.h"
49 #include "ctcm_main.h"
50 #include "ctcm_fsms.h"
51
52 const char *dev_state_names[] = {
53         [DEV_STATE_STOPPED]             = "Stopped",
54         [DEV_STATE_STARTWAIT_RXTX]      = "StartWait RXTX",
55         [DEV_STATE_STARTWAIT_RX]        = "StartWait RX",
56         [DEV_STATE_STARTWAIT_TX]        = "StartWait TX",
57         [DEV_STATE_STOPWAIT_RXTX]       = "StopWait RXTX",
58         [DEV_STATE_STOPWAIT_RX]         = "StopWait RX",
59         [DEV_STATE_STOPWAIT_TX]         = "StopWait TX",
60         [DEV_STATE_RUNNING]             = "Running",
61 };
62
63 const char *dev_event_names[] = {
64         [DEV_EVENT_START]       = "Start",
65         [DEV_EVENT_STOP]        = "Stop",
66         [DEV_EVENT_RXUP]        = "RX up",
67         [DEV_EVENT_TXUP]        = "TX up",
68         [DEV_EVENT_RXDOWN]      = "RX down",
69         [DEV_EVENT_TXDOWN]      = "TX down",
70         [DEV_EVENT_RESTART]     = "Restart",
71 };
72
73 const char *ctc_ch_event_names[] = {
74         [CTC_EVENT_IO_SUCCESS]  = "ccw_device success",
75         [CTC_EVENT_IO_EBUSY]    = "ccw_device busy",
76         [CTC_EVENT_IO_ENODEV]   = "ccw_device enodev",
77         [CTC_EVENT_IO_UNKNOWN]  = "ccw_device unknown",
78         [CTC_EVENT_ATTNBUSY]    = "Status ATTN & BUSY",
79         [CTC_EVENT_ATTN]        = "Status ATTN",
80         [CTC_EVENT_BUSY]        = "Status BUSY",
81         [CTC_EVENT_UC_RCRESET]  = "Unit check remote reset",
82         [CTC_EVENT_UC_RSRESET]  = "Unit check remote system reset",
83         [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
84         [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
85         [CTC_EVENT_UC_HWFAIL]   = "Unit check Hardware failure",
86         [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
87         [CTC_EVENT_UC_ZERO]     = "Unit check ZERO",
88         [CTC_EVENT_UC_UNKNOWN]  = "Unit check Unknown",
89         [CTC_EVENT_SC_UNKNOWN]  = "SubChannel check Unknown",
90         [CTC_EVENT_MC_FAIL]     = "Machine check failure",
91         [CTC_EVENT_MC_GOOD]     = "Machine check operational",
92         [CTC_EVENT_IRQ]         = "IRQ normal",
93         [CTC_EVENT_FINSTAT]     = "IRQ final",
94         [CTC_EVENT_TIMER]       = "Timer",
95         [CTC_EVENT_START]       = "Start",
96         [CTC_EVENT_STOP]        = "Stop",
97         /*
98         * additional MPC events
99         */
100         [CTC_EVENT_SEND_XID]    = "XID Exchange",
101         [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
102 };
103
104 const char *ctc_ch_state_names[] = {
105         [CTC_STATE_IDLE]        = "Idle",
106         [CTC_STATE_STOPPED]     = "Stopped",
107         [CTC_STATE_STARTWAIT]   = "StartWait",
108         [CTC_STATE_STARTRETRY]  = "StartRetry",
109         [CTC_STATE_SETUPWAIT]   = "SetupWait",
110         [CTC_STATE_RXINIT]      = "RX init",
111         [CTC_STATE_TXINIT]      = "TX init",
112         [CTC_STATE_RX]          = "RX",
113         [CTC_STATE_TX]          = "TX",
114         [CTC_STATE_RXIDLE]      = "RX idle",
115         [CTC_STATE_TXIDLE]      = "TX idle",
116         [CTC_STATE_RXERR]       = "RX error",
117         [CTC_STATE_TXERR]       = "TX error",
118         [CTC_STATE_TERM]        = "Terminating",
119         [CTC_STATE_DTERM]       = "Restarting",
120         [CTC_STATE_NOTOP]       = "Not operational",
121         /*
122         * additional MPC states
123         */
124         [CH_XID0_PENDING]       = "Pending XID0 Start",
125         [CH_XID0_INPROGRESS]    = "In XID0 Negotiations ",
126         [CH_XID7_PENDING]       = "Pending XID7 P1 Start",
127         [CH_XID7_PENDING1]      = "Active XID7 P1 Exchange ",
128         [CH_XID7_PENDING2]      = "Pending XID7 P2 Start ",
129         [CH_XID7_PENDING3]      = "Active XID7 P2 Exchange ",
130         [CH_XID7_PENDING4]      = "XID7 Complete - Pending READY ",
131 };
132
133 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
134
135 /*
136  * ----- static ctcm actions for channel statemachine -----
137  *
138 */
139 static void chx_txdone(fsm_instance *fi, int event, void *arg);
140 static void chx_rx(fsm_instance *fi, int event, void *arg);
141 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
142 static void chx_firstio(fsm_instance *fi, int event, void *arg);
143 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
144 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
145 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
146 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
147 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
148 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
149 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
150 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
151 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
152 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
153 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
154 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
155 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
156 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
157
158 /*
159  * ----- static ctcmpc actions for ctcmpc channel statemachine -----
160  *
161 */
162 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
163 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
164 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
165 /* shared :
166 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
167 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
168 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
169 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
170 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
171 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
172 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
173 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
174 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
175 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
176 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
177 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
178 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
179 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
180 */
181 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
182 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
183 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
184 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
185
186 /**
187  * Check return code of a preceeding ccw_device call, halt_IO etc...
188  *
189  * ch   :       The channel, the error belongs to.
190  * Returns the error code (!= 0) to inspect.
191  */
192 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
193 {
194         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
195                 "%s(%s): %s: %04x\n",
196                 CTCM_FUNTAIL, ch->id, msg, rc);
197         switch (rc) {
198         case -EBUSY:
199                 pr_info("%s: The communication peer is busy\n",
200                         ch->id);
201                 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
202                 break;
203         case -ENODEV:
204                 pr_err("%s: The specified target device is not valid\n",
205                        ch->id);
206                 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
207                 break;
208         default:
209                 pr_err("An I/O operation resulted in error %04x\n",
210                        rc);
211                 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
212         }
213 }
214
215 void ctcm_purge_skb_queue(struct sk_buff_head *q)
216 {
217         struct sk_buff *skb;
218
219         CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
220
221         while ((skb = skb_dequeue(q))) {
222                 atomic_dec(&skb->users);
223                 dev_kfree_skb_any(skb);
224         }
225 }
226
227 /**
228  * NOP action for statemachines
229  */
230 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
231 {
232 }
233
234 /*
235  * Actions for channel - statemachines.
236  */
237
238 /**
239  * Normal data has been send. Free the corresponding
240  * skb (it's in io_queue), reset dev->tbusy and
241  * revert to idle state.
242  *
243  * fi           An instance of a channel statemachine.
244  * event        The event, just happened.
245  * arg          Generic pointer, casted from channel * upon call.
246  */
247 static void chx_txdone(fsm_instance *fi, int event, void *arg)
248 {
249         struct channel *ch = arg;
250         struct net_device *dev = ch->netdev;
251         struct ctcm_priv *priv = dev->ml_priv;
252         struct sk_buff *skb;
253         int first = 1;
254         int i;
255         unsigned long duration;
256         struct timespec done_stamp = current_kernel_time(); /* xtime */
257
258         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
259
260         duration =
261             (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
262             (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
263         if (duration > ch->prof.tx_time)
264                 ch->prof.tx_time = duration;
265
266         if (ch->irb->scsw.cmd.count != 0)
267                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
268                         "%s(%s): TX not complete, remaining %d bytes",
269                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
270         fsm_deltimer(&ch->timer);
271         while ((skb = skb_dequeue(&ch->io_queue))) {
272                 priv->stats.tx_packets++;
273                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
274                 if (first) {
275                         priv->stats.tx_bytes += 2;
276                         first = 0;
277                 }
278                 atomic_dec(&skb->users);
279                 dev_kfree_skb_irq(skb);
280         }
281         spin_lock(&ch->collect_lock);
282         clear_normalized_cda(&ch->ccw[4]);
283         if (ch->collect_len > 0) {
284                 int rc;
285
286                 if (ctcm_checkalloc_buffer(ch)) {
287                         spin_unlock(&ch->collect_lock);
288                         return;
289                 }
290                 ch->trans_skb->data = ch->trans_skb_data;
291                 skb_reset_tail_pointer(ch->trans_skb);
292                 ch->trans_skb->len = 0;
293                 if (ch->prof.maxmulti < (ch->collect_len + 2))
294                         ch->prof.maxmulti = ch->collect_len + 2;
295                 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
296                         ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
297                 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
298                 i = 0;
299                 while ((skb = skb_dequeue(&ch->collect_queue))) {
300                         skb_copy_from_linear_data(skb,
301                                 skb_put(ch->trans_skb, skb->len), skb->len);
302                         priv->stats.tx_packets++;
303                         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
304                         atomic_dec(&skb->users);
305                         dev_kfree_skb_irq(skb);
306                         i++;
307                 }
308                 ch->collect_len = 0;
309                 spin_unlock(&ch->collect_lock);
310                 ch->ccw[1].count = ch->trans_skb->len;
311                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
312                 ch->prof.send_stamp = current_kernel_time(); /* xtime */
313                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
314                                                 (unsigned long)ch, 0xff, 0);
315                 ch->prof.doios_multi++;
316                 if (rc != 0) {
317                         priv->stats.tx_dropped += i;
318                         priv->stats.tx_errors += i;
319                         fsm_deltimer(&ch->timer);
320                         ctcm_ccw_check_rc(ch, rc, "chained TX");
321                 }
322         } else {
323                 spin_unlock(&ch->collect_lock);
324                 fsm_newstate(fi, CTC_STATE_TXIDLE);
325         }
326         ctcm_clear_busy_do(dev);
327 }
328
329 /**
330  * Initial data is sent.
331  * Notify device statemachine that we are up and
332  * running.
333  *
334  * fi           An instance of a channel statemachine.
335  * event        The event, just happened.
336  * arg          Generic pointer, casted from channel * upon call.
337  */
338 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
339 {
340         struct channel *ch = arg;
341         struct net_device *dev = ch->netdev;
342         struct ctcm_priv *priv = dev->ml_priv;
343
344         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
345
346         fsm_deltimer(&ch->timer);
347         fsm_newstate(fi, CTC_STATE_TXIDLE);
348         fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
349 }
350
351 /**
352  * Got normal data, check for sanity, queue it up, allocate new buffer
353  * trigger bottom half, and initiate next read.
354  *
355  * fi           An instance of a channel statemachine.
356  * event        The event, just happened.
357  * arg          Generic pointer, casted from channel * upon call.
358  */
359 static void chx_rx(fsm_instance *fi, int event, void *arg)
360 {
361         struct channel *ch = arg;
362         struct net_device *dev = ch->netdev;
363         struct ctcm_priv *priv = dev->ml_priv;
364         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
365         struct sk_buff *skb = ch->trans_skb;
366         __u16 block_len = *((__u16 *)skb->data);
367         int check_len;
368         int rc;
369
370         fsm_deltimer(&ch->timer);
371         if (len < 8) {
372                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
373                         "%s(%s): got packet with length %d < 8\n",
374                                         CTCM_FUNTAIL, dev->name, len);
375                 priv->stats.rx_dropped++;
376                 priv->stats.rx_length_errors++;
377                                                 goto again;
378         }
379         if (len > ch->max_bufsize) {
380                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
381                         "%s(%s): got packet with length %d > %d\n",
382                                 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
383                 priv->stats.rx_dropped++;
384                 priv->stats.rx_length_errors++;
385                                                 goto again;
386         }
387
388         /*
389          * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
390          */
391         switch (ch->protocol) {
392         case CTCM_PROTO_S390:
393         case CTCM_PROTO_OS390:
394                 check_len = block_len + 2;
395                 break;
396         default:
397                 check_len = block_len;
398                 break;
399         }
400         if ((len < block_len) || (len > check_len)) {
401                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
402                         "%s(%s): got block length %d != rx length %d\n",
403                                 CTCM_FUNTAIL, dev->name, block_len, len);
404                 if (do_debug)
405                         ctcmpc_dump_skb(skb, 0);
406
407                 *((__u16 *)skb->data) = len;
408                 priv->stats.rx_dropped++;
409                 priv->stats.rx_length_errors++;
410                                                 goto again;
411         }
412         if (block_len > 2) {
413                 *((__u16 *)skb->data) = block_len - 2;
414                 ctcm_unpack_skb(ch, skb);
415         }
416  again:
417         skb->data = ch->trans_skb_data;
418         skb_reset_tail_pointer(skb);
419         skb->len = 0;
420         if (ctcm_checkalloc_buffer(ch))
421                 return;
422         ch->ccw[1].count = ch->max_bufsize;
423         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
424                                         (unsigned long)ch, 0xff, 0);
425         if (rc != 0)
426                 ctcm_ccw_check_rc(ch, rc, "normal RX");
427 }
428
429 /**
430  * Initialize connection by sending a __u16 of value 0.
431  *
432  * fi           An instance of a channel statemachine.
433  * event        The event, just happened.
434  * arg          Generic pointer, casted from channel * upon call.
435  */
436 static void chx_firstio(fsm_instance *fi, int event, void *arg)
437 {
438         int rc;
439         struct channel *ch = arg;
440         int fsmstate = fsm_getstate(fi);
441
442         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
443                 "%s(%s) : %02x",
444                 CTCM_FUNTAIL, ch->id, fsmstate);
445
446         ch->sense_rc = 0;       /* reset unit check report control */
447         if (fsmstate == CTC_STATE_TXIDLE)
448                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
449                         "%s(%s): remote side issued READ?, init.\n",
450                                 CTCM_FUNTAIL, ch->id);
451         fsm_deltimer(&ch->timer);
452         if (ctcm_checkalloc_buffer(ch))
453                 return;
454         if ((fsmstate == CTC_STATE_SETUPWAIT) &&
455             (ch->protocol == CTCM_PROTO_OS390)) {
456                 /* OS/390 resp. z/OS */
457                 if (CHANNEL_DIRECTION(ch->flags) == READ) {
458                         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
459                         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
460                                      CTC_EVENT_TIMER, ch);
461                         chx_rxidle(fi, event, arg);
462                 } else {
463                         struct net_device *dev = ch->netdev;
464                         struct ctcm_priv *priv = dev->ml_priv;
465                         fsm_newstate(fi, CTC_STATE_TXIDLE);
466                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
467                 }
468                 return;
469         }
470         /*
471          * Don't setup a timer for receiving the initial RX frame
472          * if in compatibility mode, since VM TCP delays the initial
473          * frame until it has some data to send.
474          */
475         if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
476             (ch->protocol != CTCM_PROTO_S390))
477                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
478
479         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
480         ch->ccw[1].count = 2;   /* Transfer only length */
481
482         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
483                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
484         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
485                                         (unsigned long)ch, 0xff, 0);
486         if (rc != 0) {
487                 fsm_deltimer(&ch->timer);
488                 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
489                 ctcm_ccw_check_rc(ch, rc, "init IO");
490         }
491         /*
492          * If in compatibility mode since we don't setup a timer, we
493          * also signal RX channel up immediately. This enables us
494          * to send packets early which in turn usually triggers some
495          * reply from VM TCP which brings up the RX channel to it's
496          * final state.
497          */
498         if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
499             (ch->protocol == CTCM_PROTO_S390)) {
500                 struct net_device *dev = ch->netdev;
501                 struct ctcm_priv *priv = dev->ml_priv;
502                 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
503         }
504 }
505
506 /**
507  * Got initial data, check it. If OK,
508  * notify device statemachine that we are up and
509  * running.
510  *
511  * fi           An instance of a channel statemachine.
512  * event        The event, just happened.
513  * arg          Generic pointer, casted from channel * upon call.
514  */
515 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
516 {
517         struct channel *ch = arg;
518         struct net_device *dev = ch->netdev;
519         struct ctcm_priv *priv = dev->ml_priv;
520         __u16 buflen;
521         int rc;
522
523         fsm_deltimer(&ch->timer);
524         buflen = *((__u16 *)ch->trans_skb->data);
525         CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
526                         __func__, dev->name, buflen);
527
528         if (buflen >= CTCM_INITIAL_BLOCKLEN) {
529                 if (ctcm_checkalloc_buffer(ch))
530                         return;
531                 ch->ccw[1].count = ch->max_bufsize;
532                 fsm_newstate(fi, CTC_STATE_RXIDLE);
533                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
534                                                 (unsigned long)ch, 0xff, 0);
535                 if (rc != 0) {
536                         fsm_newstate(fi, CTC_STATE_RXINIT);
537                         ctcm_ccw_check_rc(ch, rc, "initial RX");
538                 } else
539                         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
540         } else {
541                 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
542                                 __func__, dev->name,
543                                         buflen, CTCM_INITIAL_BLOCKLEN);
544                 chx_firstio(fi, event, arg);
545         }
546 }
547
548 /**
549  * Set channel into extended mode.
550  *
551  * fi           An instance of a channel statemachine.
552  * event        The event, just happened.
553  * arg          Generic pointer, casted from channel * upon call.
554  */
555 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
556 {
557         struct channel *ch = arg;
558         int rc;
559         unsigned long saveflags = 0;
560         int timeout = CTCM_TIME_5_SEC;
561
562         fsm_deltimer(&ch->timer);
563         if (IS_MPC(ch)) {
564                 timeout = 1500;
565                 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
566                                 __func__, smp_processor_id(), ch, ch->id);
567         }
568         fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
569         fsm_newstate(fi, CTC_STATE_SETUPWAIT);
570         CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
571
572         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
573                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
574                         /* Such conditional locking is undeterministic in
575                          * static view. => ignore sparse warnings here. */
576
577         rc = ccw_device_start(ch->cdev, &ch->ccw[6],
578                                         (unsigned long)ch, 0xff, 0);
579         if (event == CTC_EVENT_TIMER)   /* see above comments */
580                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
581         if (rc != 0) {
582                 fsm_deltimer(&ch->timer);
583                 fsm_newstate(fi, CTC_STATE_STARTWAIT);
584                 ctcm_ccw_check_rc(ch, rc, "set Mode");
585         } else
586                 ch->retry = 0;
587 }
588
589 /**
590  * Setup channel.
591  *
592  * fi           An instance of a channel statemachine.
593  * event        The event, just happened.
594  * arg          Generic pointer, casted from channel * upon call.
595  */
596 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
597 {
598         struct channel *ch      = arg;
599         unsigned long saveflags;
600         int rc;
601
602         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
603                         CTCM_FUNTAIL, ch->id,
604                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
605
606         if (ch->trans_skb != NULL) {
607                 clear_normalized_cda(&ch->ccw[1]);
608                 dev_kfree_skb(ch->trans_skb);
609                 ch->trans_skb = NULL;
610         }
611         if (CHANNEL_DIRECTION(ch->flags) == READ) {
612                 ch->ccw[1].cmd_code = CCW_CMD_READ;
613                 ch->ccw[1].flags = CCW_FLAG_SLI;
614                 ch->ccw[1].count = 0;
615         } else {
616                 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
617                 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
618                 ch->ccw[1].count = 0;
619         }
620         if (ctcm_checkalloc_buffer(ch)) {
621                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
622                         "%s(%s): %s trans_skb alloc delayed "
623                         "until first transfer",
624                         CTCM_FUNTAIL, ch->id,
625                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
626         }
627         ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
628         ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
629         ch->ccw[0].count = 0;
630         ch->ccw[0].cda = 0;
631         ch->ccw[2].cmd_code = CCW_CMD_NOOP;     /* jointed CE + DE */
632         ch->ccw[2].flags = CCW_FLAG_SLI;
633         ch->ccw[2].count = 0;
634         ch->ccw[2].cda = 0;
635         memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
636         ch->ccw[4].cda = 0;
637         ch->ccw[4].flags &= ~CCW_FLAG_IDA;
638
639         fsm_newstate(fi, CTC_STATE_STARTWAIT);
640         fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
641         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
642         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
643         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
644         if (rc != 0) {
645                 if (rc != -EBUSY)
646                         fsm_deltimer(&ch->timer);
647                 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
648         }
649 }
650
651 /**
652  * Shutdown a channel.
653  *
654  * fi           An instance of a channel statemachine.
655  * event        The event, just happened.
656  * arg          Generic pointer, casted from channel * upon call.
657  */
658 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
659 {
660         struct channel *ch = arg;
661         unsigned long saveflags = 0;
662         int rc;
663         int oldstate;
664
665         fsm_deltimer(&ch->timer);
666         if (IS_MPC(ch))
667                 fsm_deltimer(&ch->sweep_timer);
668
669         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
670
671         if (event == CTC_EVENT_STOP)    /* only for STOP not yet locked */
672                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
673                         /* Such conditional locking is undeterministic in
674                          * static view. => ignore sparse warnings here. */
675         oldstate = fsm_getstate(fi);
676         fsm_newstate(fi, CTC_STATE_TERM);
677         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
678
679         if (event == CTC_EVENT_STOP)
680                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
681                         /* see remark above about conditional locking */
682
683         if (rc != 0 && rc != -EBUSY) {
684                 fsm_deltimer(&ch->timer);
685                 if (event != CTC_EVENT_STOP) {
686                         fsm_newstate(fi, oldstate);
687                         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
688                 }
689         }
690 }
691
692 /**
693  * Cleanup helper for chx_fail and chx_stopped
694  * cleanup channels queue and notify interface statemachine.
695  *
696  * fi           An instance of a channel statemachine.
697  * state        The next state (depending on caller).
698  * ch           The channel to operate on.
699  */
700 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
701                 struct channel *ch)
702 {
703         struct net_device *dev = ch->netdev;
704         struct ctcm_priv *priv = dev->ml_priv;
705
706         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
707                         "%s(%s): %s[%d]\n",
708                         CTCM_FUNTAIL, dev->name, ch->id, state);
709
710         fsm_deltimer(&ch->timer);
711         if (IS_MPC(ch))
712                 fsm_deltimer(&ch->sweep_timer);
713
714         fsm_newstate(fi, state);
715         if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
716                 clear_normalized_cda(&ch->ccw[1]);
717                 dev_kfree_skb_any(ch->trans_skb);
718                 ch->trans_skb = NULL;
719         }
720
721         ch->th_seg = 0x00;
722         ch->th_seq_num = 0x00;
723         if (CHANNEL_DIRECTION(ch->flags) == READ) {
724                 skb_queue_purge(&ch->io_queue);
725                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
726         } else {
727                 ctcm_purge_skb_queue(&ch->io_queue);
728                 if (IS_MPC(ch))
729                         ctcm_purge_skb_queue(&ch->sweep_queue);
730                 spin_lock(&ch->collect_lock);
731                 ctcm_purge_skb_queue(&ch->collect_queue);
732                 ch->collect_len = 0;
733                 spin_unlock(&ch->collect_lock);
734                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
735         }
736 }
737
738 /**
739  * A channel has successfully been halted.
740  * Cleanup it's queue and notify interface statemachine.
741  *
742  * fi           An instance of a channel statemachine.
743  * event        The event, just happened.
744  * arg          Generic pointer, casted from channel * upon call.
745  */
746 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
747 {
748         ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
749 }
750
751 /**
752  * A stop command from device statemachine arrived and we are in
753  * not operational mode. Set state to stopped.
754  *
755  * fi           An instance of a channel statemachine.
756  * event        The event, just happened.
757  * arg          Generic pointer, casted from channel * upon call.
758  */
759 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
760 {
761         fsm_newstate(fi, CTC_STATE_STOPPED);
762 }
763
764 /**
765  * A machine check for no path, not operational status or gone device has
766  * happened.
767  * Cleanup queue and notify interface statemachine.
768  *
769  * fi           An instance of a channel statemachine.
770  * event        The event, just happened.
771  * arg          Generic pointer, casted from channel * upon call.
772  */
773 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
774 {
775         ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
776 }
777
778 /**
779  * Handle error during setup of channel.
780  *
781  * fi           An instance of a channel statemachine.
782  * event        The event, just happened.
783  * arg          Generic pointer, casted from channel * upon call.
784  */
785 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
786 {
787         struct channel *ch = arg;
788         struct net_device *dev = ch->netdev;
789         struct ctcm_priv *priv = dev->ml_priv;
790
791         /*
792          * Special case: Got UC_RCRESET on setmode.
793          * This means that remote side isn't setup. In this case
794          * simply retry after some 10 secs...
795          */
796         if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
797             ((event == CTC_EVENT_UC_RCRESET) ||
798              (event == CTC_EVENT_UC_RSRESET))) {
799                 fsm_newstate(fi, CTC_STATE_STARTRETRY);
800                 fsm_deltimer(&ch->timer);
801                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
802                 if (!IS_MPC(ch) && (CHANNEL_DIRECTION(ch->flags) == READ)) {
803                         int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
804                         if (rc != 0)
805                                 ctcm_ccw_check_rc(ch, rc,
806                                         "HaltIO in chx_setuperr");
807                 }
808                 return;
809         }
810
811         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
812                 "%s(%s) : %s error during %s channel setup state=%s\n",
813                 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
814                 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
815                 fsm_getstate_str(fi));
816
817         if (CHANNEL_DIRECTION(ch->flags) == READ) {
818                 fsm_newstate(fi, CTC_STATE_RXERR);
819                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
820         } else {
821                 fsm_newstate(fi, CTC_STATE_TXERR);
822                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
823         }
824 }
825
826 /**
827  * Restart a channel after an error.
828  *
829  * fi           An instance of a channel statemachine.
830  * event        The event, just happened.
831  * arg          Generic pointer, casted from channel * upon call.
832  */
833 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
834 {
835         struct channel *ch = arg;
836         struct net_device *dev = ch->netdev;
837         unsigned long saveflags = 0;
838         int oldstate;
839         int rc;
840
841         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
842                 "%s: %s[%d] of %s\n",
843                         CTCM_FUNTAIL, ch->id, event, dev->name);
844
845         fsm_deltimer(&ch->timer);
846
847         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
848         oldstate = fsm_getstate(fi);
849         fsm_newstate(fi, CTC_STATE_STARTWAIT);
850         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
851                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
852                         /* Such conditional locking is a known problem for
853                          * sparse because its undeterministic in static view.
854                          * Warnings should be ignored here. */
855         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
856         if (event == CTC_EVENT_TIMER)
857                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
858         if (rc != 0) {
859                 if (rc != -EBUSY) {
860                     fsm_deltimer(&ch->timer);
861                     fsm_newstate(fi, oldstate);
862                 }
863                 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
864         }
865 }
866
867 /**
868  * Handle error during RX initial handshake (exchange of
869  * 0-length block header)
870  *
871  * fi           An instance of a channel statemachine.
872  * event        The event, just happened.
873  * arg          Generic pointer, casted from channel * upon call.
874  */
875 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
876 {
877         struct channel *ch = arg;
878         struct net_device *dev = ch->netdev;
879         struct ctcm_priv *priv = dev->ml_priv;
880
881         if (event == CTC_EVENT_TIMER) {
882                 if (!IS_MPCDEV(dev))
883                         /* TODO : check if MPC deletes timer somewhere */
884                         fsm_deltimer(&ch->timer);
885                 if (ch->retry++ < 3)
886                         ctcm_chx_restart(fi, event, arg);
887                 else {
888                         fsm_newstate(fi, CTC_STATE_RXERR);
889                         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
890                 }
891         } else {
892                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
893                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
894                         ctc_ch_event_names[event], fsm_getstate_str(fi));
895
896                 dev_warn(&dev->dev,
897                         "Initialization failed with RX/TX init handshake "
898                         "error %s\n", ctc_ch_event_names[event]);
899         }
900 }
901
902 /**
903  * Notify device statemachine if we gave up initialization
904  * of RX channel.
905  *
906  * fi           An instance of a channel statemachine.
907  * event        The event, just happened.
908  * arg          Generic pointer, casted from channel * upon call.
909  */
910 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
911 {
912         struct channel *ch = arg;
913         struct net_device *dev = ch->netdev;
914         struct ctcm_priv *priv = dev->ml_priv;
915
916         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
917                         "%s(%s): RX %s busy, init. fail",
918                                 CTCM_FUNTAIL, dev->name, ch->id);
919         fsm_newstate(fi, CTC_STATE_RXERR);
920         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
921 }
922
923 /**
924  * Handle RX Unit check remote reset (remote disconnected)
925  *
926  * fi           An instance of a channel statemachine.
927  * event        The event, just happened.
928  * arg          Generic pointer, casted from channel * upon call.
929  */
930 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
931 {
932         struct channel *ch = arg;
933         struct channel *ch2;
934         struct net_device *dev = ch->netdev;
935         struct ctcm_priv *priv = dev->ml_priv;
936
937         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
938                         "%s: %s: remote disconnect - re-init ...",
939                                 CTCM_FUNTAIL, dev->name);
940         fsm_deltimer(&ch->timer);
941         /*
942          * Notify device statemachine
943          */
944         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
945         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
946
947         fsm_newstate(fi, CTC_STATE_DTERM);
948         ch2 = priv->channel[WRITE];
949         fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
950
951         ccw_device_halt(ch->cdev, (unsigned long)ch);
952         ccw_device_halt(ch2->cdev, (unsigned long)ch2);
953 }
954
955 /**
956  * Handle error during TX channel initialization.
957  *
958  * fi           An instance of a channel statemachine.
959  * event        The event, just happened.
960  * arg          Generic pointer, casted from channel * upon call.
961  */
962 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
963 {
964         struct channel *ch = arg;
965         struct net_device *dev = ch->netdev;
966         struct ctcm_priv *priv = dev->ml_priv;
967
968         if (event == CTC_EVENT_TIMER) {
969                 fsm_deltimer(&ch->timer);
970                 if (ch->retry++ < 3)
971                         ctcm_chx_restart(fi, event, arg);
972                 else {
973                         fsm_newstate(fi, CTC_STATE_TXERR);
974                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
975                 }
976         } else {
977                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
978                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
979                         ctc_ch_event_names[event], fsm_getstate_str(fi));
980
981                 dev_warn(&dev->dev,
982                         "Initialization failed with RX/TX init handshake "
983                         "error %s\n", ctc_ch_event_names[event]);
984         }
985 }
986
987 /**
988  * Handle TX timeout by retrying operation.
989  *
990  * fi           An instance of a channel statemachine.
991  * event        The event, just happened.
992  * arg          Generic pointer, casted from channel * upon call.
993  */
994 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
995 {
996         struct channel *ch = arg;
997         struct net_device *dev = ch->netdev;
998         struct ctcm_priv *priv = dev->ml_priv;
999         struct sk_buff *skb;
1000
1001         CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1002                         __func__, smp_processor_id(), ch, ch->id);
1003
1004         fsm_deltimer(&ch->timer);
1005         if (ch->retry++ > 3) {
1006                 struct mpc_group *gptr = priv->mpcg;
1007                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1008                                 "%s: %s: retries exceeded",
1009                                         CTCM_FUNTAIL, ch->id);
1010                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1011                 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1012                         use gptr as mpc indicator */
1013                 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1014                         ctcm_chx_restart(fi, event, arg);
1015                                 goto done;
1016         }
1017
1018         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1019                         "%s : %s: retry %d",
1020                                 CTCM_FUNTAIL, ch->id, ch->retry);
1021         skb = skb_peek(&ch->io_queue);
1022         if (skb) {
1023                 int rc = 0;
1024                 unsigned long saveflags = 0;
1025                 clear_normalized_cda(&ch->ccw[4]);
1026                 ch->ccw[4].count = skb->len;
1027                 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1028                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1029                                 "%s: %s: IDAL alloc failed",
1030                                                 CTCM_FUNTAIL, ch->id);
1031                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1032                         ctcm_chx_restart(fi, event, arg);
1033                                 goto done;
1034                 }
1035                 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1036                 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1037                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1038                         /* Such conditional locking is a known problem for
1039                          * sparse because its undeterministic in static view.
1040                          * Warnings should be ignored here. */
1041                 if (do_debug_ccw)
1042                         ctcmpc_dumpit((char *)&ch->ccw[3],
1043                                         sizeof(struct ccw1) * 3);
1044
1045                 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1046                                                 (unsigned long)ch, 0xff, 0);
1047                 if (event == CTC_EVENT_TIMER)
1048                         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1049                                         saveflags);
1050                 if (rc != 0) {
1051                         fsm_deltimer(&ch->timer);
1052                         ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1053                         ctcm_purge_skb_queue(&ch->io_queue);
1054                 }
1055         }
1056 done:
1057         return;
1058 }
1059
1060 /**
1061  * Handle fatal errors during an I/O command.
1062  *
1063  * fi           An instance of a channel statemachine.
1064  * event        The event, just happened.
1065  * arg          Generic pointer, casted from channel * upon call.
1066  */
1067 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1068 {
1069         struct channel *ch = arg;
1070         struct net_device *dev = ch->netdev;
1071         struct ctcm_priv *priv = dev->ml_priv;
1072         int rd = CHANNEL_DIRECTION(ch->flags);
1073
1074         fsm_deltimer(&ch->timer);
1075         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1076                 "%s: %s: %s unrecoverable channel error",
1077                         CTCM_FUNTAIL, ch->id, rd == READ ? "RX" : "TX");
1078
1079         if (IS_MPC(ch)) {
1080                 priv->stats.tx_dropped++;
1081                 priv->stats.tx_errors++;
1082         }
1083         if (rd == READ) {
1084                 fsm_newstate(fi, CTC_STATE_RXERR);
1085                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1086         } else {
1087                 fsm_newstate(fi, CTC_STATE_TXERR);
1088                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1089         }
1090 }
1091
1092 /*
1093  * The ctcm statemachine for a channel.
1094  */
1095 const fsm_node ch_fsm[] = {
1096         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1097         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1098         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1099         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1100
1101         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1102         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1103         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1104         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1105         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1106
1107         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1108         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1109         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1110         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1111         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1112         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1113
1114         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1115         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1116         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1117         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1118
1119         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1120         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1121         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      chx_firstio  },
1122         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1123         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1124         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1125         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1126         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1127
1128         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1129         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1130         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      chx_rxidle  },
1131         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1132         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1133         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1134         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1135         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1136         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      chx_firstio  },
1137         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1138
1139         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1140         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1141         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      chx_rx  },
1142         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1143         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1144         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1145         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      chx_rx  },
1146
1147         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1148         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1149         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1150         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1151         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1152         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
1153         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1154         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1155
1156         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1157         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1158         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      chx_firstio  },
1159         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1160         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1161         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1162         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1163
1164         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
1165         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
1166         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
1167         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1168         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1169         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1170
1171         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1172         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
1173         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1174         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1175         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1176         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1177
1178         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
1179         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
1180         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      chx_txdone  },
1181         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_txretry  },
1182         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_txretry  },
1183         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
1184         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1185         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1186
1187         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1188         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1189         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1190         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1191 };
1192
1193 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1194
1195 /*
1196  * MPC actions for mpc channel statemachine
1197  * handling of MPC protocol requires extra
1198  * statemachine and actions which are prefixed ctcmpc_ .
1199  * The ctc_ch_states and ctc_ch_state_names,
1200  * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1201  * which are expanded by some elements.
1202  */
1203
1204 /*
1205  * Actions for mpc channel statemachine.
1206  */
1207
1208 /**
1209  * Normal data has been send. Free the corresponding
1210  * skb (it's in io_queue), reset dev->tbusy and
1211  * revert to idle state.
1212  *
1213  * fi           An instance of a channel statemachine.
1214  * event        The event, just happened.
1215  * arg          Generic pointer, casted from channel * upon call.
1216  */
1217 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1218 {
1219         struct channel          *ch = arg;
1220         struct net_device       *dev = ch->netdev;
1221         struct ctcm_priv        *priv = dev->ml_priv;
1222         struct mpc_group        *grp = priv->mpcg;
1223         struct sk_buff          *skb;
1224         int             first = 1;
1225         int             i;
1226         __u32           data_space;
1227         unsigned long   duration;
1228         struct sk_buff  *peekskb;
1229         int             rc;
1230         struct th_header *header;
1231         struct pdu      *p_header;
1232         struct timespec done_stamp = current_kernel_time(); /* xtime */
1233
1234         CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1235                         __func__, dev->name, smp_processor_id());
1236
1237         duration =
1238                 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1239                 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1240         if (duration > ch->prof.tx_time)
1241                 ch->prof.tx_time = duration;
1242
1243         if (ch->irb->scsw.cmd.count != 0)
1244                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1245                         "%s(%s): TX not complete, remaining %d bytes",
1246                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1247         fsm_deltimer(&ch->timer);
1248         while ((skb = skb_dequeue(&ch->io_queue))) {
1249                 priv->stats.tx_packets++;
1250                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1251                 if (first) {
1252                         priv->stats.tx_bytes += 2;
1253                         first = 0;
1254                 }
1255                 atomic_dec(&skb->users);
1256                 dev_kfree_skb_irq(skb);
1257         }
1258         spin_lock(&ch->collect_lock);
1259         clear_normalized_cda(&ch->ccw[4]);
1260         if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1261                 spin_unlock(&ch->collect_lock);
1262                 fsm_newstate(fi, CTC_STATE_TXIDLE);
1263                                 goto done;
1264         }
1265
1266         if (ctcm_checkalloc_buffer(ch)) {
1267                 spin_unlock(&ch->collect_lock);
1268                                 goto done;
1269         }
1270         ch->trans_skb->data = ch->trans_skb_data;
1271         skb_reset_tail_pointer(ch->trans_skb);
1272         ch->trans_skb->len = 0;
1273         if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1274                 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1275         if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1276                 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1277         i = 0;
1278         p_header = NULL;
1279         data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1280
1281         CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1282                        " data_space:%04x\n",
1283                        __func__, data_space);
1284
1285         while ((skb = skb_dequeue(&ch->collect_queue))) {
1286                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1287                 p_header = (struct pdu *)
1288                         (skb_tail_pointer(ch->trans_skb) - skb->len);
1289                 p_header->pdu_flag = 0x00;
1290                 if (skb->protocol == ntohs(ETH_P_SNAP))
1291                         p_header->pdu_flag |= 0x60;
1292                 else
1293                         p_header->pdu_flag |= 0x20;
1294
1295                 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1296                                 __func__, ch->trans_skb->len);
1297                 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1298                                 " to 32 bytes sent to vtam\n", __func__);
1299                 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1300
1301                 ch->collect_len -= skb->len;
1302                 data_space -= skb->len;
1303                 priv->stats.tx_packets++;
1304                 priv->stats.tx_bytes += skb->len;
1305                 atomic_dec(&skb->users);
1306                 dev_kfree_skb_any(skb);
1307                 peekskb = skb_peek(&ch->collect_queue);
1308                 if (peekskb->len > data_space)
1309                         break;
1310                 i++;
1311         }
1312         /* p_header points to the last one we handled */
1313         if (p_header)
1314                 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1315         header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1316         if (!header) {
1317                 spin_unlock(&ch->collect_lock);
1318                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1319                                 goto done;
1320         }
1321         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
1322         ch->th_seq_num++;
1323         header->th_seq_num = ch->th_seq_num;
1324
1325         CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1326                                         __func__, ch->th_seq_num);
1327
1328         memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1329                 TH_HEADER_LENGTH);      /* put the TH on the packet */
1330
1331         kfree(header);
1332
1333         CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1334                        __func__, ch->trans_skb->len);
1335         CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1336                         "data to vtam from collect_q\n", __func__);
1337         CTCM_D3_DUMP((char *)ch->trans_skb->data,
1338                                 min_t(int, ch->trans_skb->len, 50));
1339
1340         spin_unlock(&ch->collect_lock);
1341         clear_normalized_cda(&ch->ccw[1]);
1342         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1343                 dev_kfree_skb_any(ch->trans_skb);
1344                 ch->trans_skb = NULL;
1345                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1346                         "%s: %s: IDAL alloc failed",
1347                                 CTCM_FUNTAIL, ch->id);
1348                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1349                 return;
1350         }
1351         ch->ccw[1].count = ch->trans_skb->len;
1352         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1353         ch->prof.send_stamp = current_kernel_time(); /* xtime */
1354         if (do_debug_ccw)
1355                 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1356         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1357                                         (unsigned long)ch, 0xff, 0);
1358         ch->prof.doios_multi++;
1359         if (rc != 0) {
1360                 priv->stats.tx_dropped += i;
1361                 priv->stats.tx_errors += i;
1362                 fsm_deltimer(&ch->timer);
1363                 ctcm_ccw_check_rc(ch, rc, "chained TX");
1364         }
1365 done:
1366         ctcm_clear_busy(dev);
1367         return;
1368 }
1369
1370 /**
1371  * Got normal data, check for sanity, queue it up, allocate new buffer
1372  * trigger bottom half, and initiate next read.
1373  *
1374  * fi           An instance of a channel statemachine.
1375  * event        The event, just happened.
1376  * arg          Generic pointer, casted from channel * upon call.
1377  */
1378 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1379 {
1380         struct channel          *ch = arg;
1381         struct net_device       *dev = ch->netdev;
1382         struct ctcm_priv        *priv = dev->ml_priv;
1383         struct mpc_group        *grp = priv->mpcg;
1384         struct sk_buff          *skb = ch->trans_skb;
1385         struct sk_buff          *new_skb;
1386         unsigned long           saveflags = 0;  /* avoids compiler warning */
1387         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1388
1389         CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1390                         CTCM_FUNTAIL, dev->name, smp_processor_id(),
1391                                 ch->id, ch->max_bufsize, len);
1392         fsm_deltimer(&ch->timer);
1393
1394         if (skb == NULL) {
1395                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1396                         "%s(%s): TRANS_SKB = NULL",
1397                                 CTCM_FUNTAIL, dev->name);
1398                         goto again;
1399         }
1400
1401         if (len < TH_HEADER_LENGTH) {
1402                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1403                                 "%s(%s): packet length %d to short",
1404                                         CTCM_FUNTAIL, dev->name, len);
1405                 priv->stats.rx_dropped++;
1406                 priv->stats.rx_length_errors++;
1407         } else {
1408                 /* must have valid th header or game over */
1409                 __u32   block_len = len;
1410                 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1411                 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1412
1413                 if (new_skb == NULL) {
1414                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1415                                 "%s(%d): skb allocation failed",
1416                                                 CTCM_FUNTAIL, dev->name);
1417                         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1418                                         goto again;
1419                 }
1420                 switch (fsm_getstate(grp->fsm)) {
1421                 case MPCG_STATE_RESET:
1422                 case MPCG_STATE_INOP:
1423                         dev_kfree_skb_any(new_skb);
1424                         break;
1425                 case MPCG_STATE_FLOWC:
1426                 case MPCG_STATE_READY:
1427                         memcpy(skb_put(new_skb, block_len),
1428                                                skb->data, block_len);
1429                         skb_queue_tail(&ch->io_queue, new_skb);
1430                         tasklet_schedule(&ch->ch_tasklet);
1431                         break;
1432                 default:
1433                         memcpy(skb_put(new_skb, len), skb->data, len);
1434                         skb_queue_tail(&ch->io_queue, new_skb);
1435                         tasklet_hi_schedule(&ch->ch_tasklet);
1436                         break;
1437                 }
1438         }
1439
1440 again:
1441         switch (fsm_getstate(grp->fsm)) {
1442         int rc, dolock;
1443         case MPCG_STATE_FLOWC:
1444         case MPCG_STATE_READY:
1445                 if (ctcm_checkalloc_buffer(ch))
1446                         break;
1447                 ch->trans_skb->data = ch->trans_skb_data;
1448                 skb_reset_tail_pointer(ch->trans_skb);
1449                 ch->trans_skb->len = 0;
1450                 ch->ccw[1].count = ch->max_bufsize;
1451                         if (do_debug_ccw)
1452                         ctcmpc_dumpit((char *)&ch->ccw[0],
1453                                         sizeof(struct ccw1) * 3);
1454                 dolock = !in_irq();
1455                 if (dolock)
1456                         spin_lock_irqsave(
1457                                 get_ccwdev_lock(ch->cdev), saveflags);
1458                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1459                                                 (unsigned long)ch, 0xff, 0);
1460                 if (dolock) /* see remark about conditional locking */
1461                         spin_unlock_irqrestore(
1462                                 get_ccwdev_lock(ch->cdev), saveflags);
1463                 if (rc != 0)
1464                         ctcm_ccw_check_rc(ch, rc, "normal RX");
1465         default:
1466                 break;
1467         }
1468
1469         CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1470                         __func__, dev->name, ch, ch->id);
1471
1472 }
1473
1474 /**
1475  * Initialize connection by sending a __u16 of value 0.
1476  *
1477  * fi           An instance of a channel statemachine.
1478  * event        The event, just happened.
1479  * arg          Generic pointer, casted from channel * upon call.
1480  */
1481 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1482 {
1483         struct channel          *ch = arg;
1484         struct net_device       *dev = ch->netdev;
1485         struct ctcm_priv        *priv = dev->ml_priv;
1486         struct mpc_group        *gptr = priv->mpcg;
1487
1488         CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1489                                 __func__, ch->id, ch);
1490
1491         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1492                         "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1493                         CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1494                         fsm_getstate(gptr->fsm), ch->protocol);
1495
1496         if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1497                 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1498
1499         fsm_deltimer(&ch->timer);
1500         if (ctcm_checkalloc_buffer(ch))
1501                                 goto done;
1502
1503         switch (fsm_getstate(fi)) {
1504         case CTC_STATE_STARTRETRY:
1505         case CTC_STATE_SETUPWAIT:
1506                 if (CHANNEL_DIRECTION(ch->flags) == READ) {
1507                         ctcmpc_chx_rxidle(fi, event, arg);
1508                 } else {
1509                         fsm_newstate(fi, CTC_STATE_TXIDLE);
1510                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1511                 }
1512                                 goto done;
1513         default:
1514                 break;
1515         };
1516
1517         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
1518                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1519
1520 done:
1521         CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1522                                 __func__, ch->id, ch);
1523         return;
1524 }
1525
1526 /**
1527  * Got initial data, check it. If OK,
1528  * notify device statemachine that we are up and
1529  * running.
1530  *
1531  * fi           An instance of a channel statemachine.
1532  * event        The event, just happened.
1533  * arg          Generic pointer, casted from channel * upon call.
1534  */
1535 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1536 {
1537         struct channel *ch = arg;
1538         struct net_device *dev = ch->netdev;
1539         struct ctcm_priv  *priv = dev->ml_priv;
1540         struct mpc_group  *grp = priv->mpcg;
1541         int rc;
1542         unsigned long saveflags = 0;    /* avoids compiler warning */
1543
1544         fsm_deltimer(&ch->timer);
1545         CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1546                         __func__, ch->id, dev->name, smp_processor_id(),
1547                                 fsm_getstate(fi), fsm_getstate(grp->fsm));
1548
1549         fsm_newstate(fi, CTC_STATE_RXIDLE);
1550         /* XID processing complete */
1551
1552         switch (fsm_getstate(grp->fsm)) {
1553         case MPCG_STATE_FLOWC:
1554         case MPCG_STATE_READY:
1555                 if (ctcm_checkalloc_buffer(ch))
1556                                 goto done;
1557                 ch->trans_skb->data = ch->trans_skb_data;
1558                 skb_reset_tail_pointer(ch->trans_skb);
1559                 ch->trans_skb->len = 0;
1560                 ch->ccw[1].count = ch->max_bufsize;
1561                 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1562                 if (event == CTC_EVENT_START)
1563                         /* see remark about conditional locking */
1564                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1565                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1566                                                 (unsigned long)ch, 0xff, 0);
1567                 if (event == CTC_EVENT_START)
1568                         spin_unlock_irqrestore(
1569                                         get_ccwdev_lock(ch->cdev), saveflags);
1570                 if (rc != 0) {
1571                         fsm_newstate(fi, CTC_STATE_RXINIT);
1572                         ctcm_ccw_check_rc(ch, rc, "initial RX");
1573                                 goto done;
1574                 }
1575                 break;
1576         default:
1577                 break;
1578         }
1579
1580         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1581 done:
1582         return;
1583 }
1584
1585 /*
1586  * ctcmpc channel FSM action
1587  * called from several points in ctcmpc_ch_fsm
1588  * ctcmpc only
1589  */
1590 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1591 {
1592         struct channel    *ch     = arg;
1593         struct net_device *dev    = ch->netdev;
1594         struct ctcm_priv  *priv   = dev->ml_priv;
1595         struct mpc_group  *grp = priv->mpcg;
1596
1597         CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1598                 __func__, dev->name, ch->id, ch, smp_processor_id(),
1599                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1600
1601         switch (fsm_getstate(grp->fsm)) {
1602         case MPCG_STATE_XID2INITW:
1603                 /* ok..start yside xid exchanges */
1604                 if (!ch->in_mpcgroup)
1605                         break;
1606                 if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
1607                         fsm_deltimer(&grp->timer);
1608                         fsm_addtimer(&grp->timer,
1609                                 MPC_XID_TIMEOUT_VALUE,
1610                                 MPCG_EVENT_TIMER, dev);
1611                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1612
1613                 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1614                         /* attn rcvd before xid0 processed via bh */
1615                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1616                 break;
1617         case MPCG_STATE_XID2INITX:
1618         case MPCG_STATE_XID0IOWAIT:
1619         case MPCG_STATE_XID0IOWAIX:
1620                 /* attn rcvd before xid0 processed on ch
1621                 but mid-xid0 processing for group    */
1622                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1623                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1624                 break;
1625         case MPCG_STATE_XID7INITW:
1626         case MPCG_STATE_XID7INITX:
1627         case MPCG_STATE_XID7INITI:
1628         case MPCG_STATE_XID7INITZ:
1629                 switch (fsm_getstate(ch->fsm)) {
1630                 case CH_XID7_PENDING:
1631                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1632                         break;
1633                 case CH_XID7_PENDING2:
1634                         fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1635                         break;
1636                 }
1637                 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1638                 break;
1639         }
1640
1641         return;
1642 }
1643
1644 /*
1645  * ctcmpc channel FSM action
1646  * called from one point in ctcmpc_ch_fsm
1647  * ctcmpc only
1648  */
1649 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1650 {
1651         struct channel    *ch     = arg;
1652         struct net_device *dev    = ch->netdev;
1653         struct ctcm_priv  *priv   = dev->ml_priv;
1654         struct mpc_group  *grp    = priv->mpcg;
1655
1656         CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
1657                         __func__, dev->name, ch->id,
1658                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1659
1660         fsm_deltimer(&ch->timer);
1661
1662         switch (fsm_getstate(grp->fsm)) {
1663         case MPCG_STATE_XID0IOWAIT:
1664                 /* vtam wants to be primary.start yside xid exchanges*/
1665                 /* only receive one attn-busy at a time so must not  */
1666                 /* change state each time                            */
1667                 grp->changed_side = 1;
1668                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1669                 break;
1670         case MPCG_STATE_XID2INITW:
1671                 if (grp->changed_side == 1) {
1672                         grp->changed_side = 2;
1673                         break;
1674                 }
1675                 /* process began via call to establish_conn      */
1676                 /* so must report failure instead of reverting   */
1677                 /* back to ready-for-xid passive state           */
1678                 if (grp->estconnfunc)
1679                                 goto done;
1680                 /* this attnbusy is NOT the result of xside xid  */
1681                 /* collisions so yside must have been triggered  */
1682                 /* by an ATTN that was not intended to start XID */
1683                 /* processing. Revert back to ready-for-xid and  */
1684                 /* wait for ATTN interrupt to signal xid start   */
1685                 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1686                         fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1687                         fsm_deltimer(&grp->timer);
1688                                 goto done;
1689                 }
1690                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1691                                 goto done;
1692         case MPCG_STATE_XID2INITX:
1693                 /* XID2 was received before ATTN Busy for second
1694                    channel.Send yside xid for second channel.
1695                 */
1696                 if (grp->changed_side == 1) {
1697                         grp->changed_side = 2;
1698                         break;
1699                 }
1700         case MPCG_STATE_XID0IOWAIX:
1701         case MPCG_STATE_XID7INITW:
1702         case MPCG_STATE_XID7INITX:
1703         case MPCG_STATE_XID7INITI:
1704         case MPCG_STATE_XID7INITZ:
1705         default:
1706                 /* multiple attn-busy indicates too out-of-sync      */
1707                 /* and they are certainly not being received as part */
1708                 /* of valid mpc group negotiations..                 */
1709                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1710                                 goto done;
1711         }
1712
1713         if (grp->changed_side == 1) {
1714                 fsm_deltimer(&grp->timer);
1715                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1716                              MPCG_EVENT_TIMER, dev);
1717         }
1718         if (ch->in_mpcgroup)
1719                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1720         else
1721                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1722                         "%s(%s): channel %s not added to group",
1723                                 CTCM_FUNTAIL, dev->name, ch->id);
1724
1725 done:
1726         return;
1727 }
1728
1729 /*
1730  * ctcmpc channel FSM action
1731  * called from several points in ctcmpc_ch_fsm
1732  * ctcmpc only
1733  */
1734 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1735 {
1736         struct channel     *ch     = arg;
1737         struct net_device  *dev    = ch->netdev;
1738         struct ctcm_priv   *priv   = dev->ml_priv;
1739         struct mpc_group   *grp    = priv->mpcg;
1740
1741         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1742         return;
1743 }
1744
1745 /*
1746  * ctcmpc channel FSM action
1747  * called from several points in ctcmpc_ch_fsm
1748  * ctcmpc only
1749  */
1750 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1751 {
1752         struct channel *ach = arg;
1753         struct net_device *dev = ach->netdev;
1754         struct ctcm_priv *priv = dev->ml_priv;
1755         struct mpc_group *grp = priv->mpcg;
1756         struct channel *wch = priv->channel[WRITE];
1757         struct channel *rch = priv->channel[READ];
1758         struct sk_buff *skb;
1759         struct th_sweep *header;
1760         int rc = 0;
1761         unsigned long saveflags = 0;
1762
1763         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1764                         __func__, smp_processor_id(), ach, ach->id);
1765
1766         if (grp->in_sweep == 0)
1767                                 goto done;
1768
1769         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1770                                 __func__, wch->th_seq_num);
1771         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1772                                 __func__, rch->th_seq_num);
1773
1774         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1775                 /* give the previous IO time to complete */
1776                 fsm_addtimer(&wch->sweep_timer,
1777                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1778                                 goto done;
1779         }
1780
1781         skb = skb_dequeue(&wch->sweep_queue);
1782         if (!skb)
1783                                 goto done;
1784
1785         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1786                 grp->in_sweep = 0;
1787                 ctcm_clear_busy_do(dev);
1788                 dev_kfree_skb_any(skb);
1789                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1790                                 goto done;
1791         } else {
1792                 atomic_inc(&skb->users);
1793                 skb_queue_tail(&wch->io_queue, skb);
1794         }
1795
1796         /* send out the sweep */
1797         wch->ccw[4].count = skb->len;
1798
1799         header = (struct th_sweep *)skb->data;
1800         switch (header->th.th_ch_flag) {
1801         case TH_SWEEP_REQ:
1802                 grp->sweep_req_pend_num--;
1803                 break;
1804         case TH_SWEEP_RESP:
1805                 grp->sweep_rsp_pend_num--;
1806                 break;
1807         }
1808
1809         header->sw.th_last_seq = wch->th_seq_num;
1810
1811         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1812         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1813         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1814
1815         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1816         fsm_newstate(wch->fsm, CTC_STATE_TX);
1817
1818         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1819         wch->prof.send_stamp = current_kernel_time(); /* xtime */
1820         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1821                                         (unsigned long) wch, 0xff, 0);
1822         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1823
1824         if ((grp->sweep_req_pend_num == 0) &&
1825            (grp->sweep_rsp_pend_num == 0)) {
1826                 grp->in_sweep = 0;
1827                 rch->th_seq_num = 0x00;
1828                 wch->th_seq_num = 0x00;
1829                 ctcm_clear_busy_do(dev);
1830         }
1831
1832         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1833                         __func__, wch->th_seq_num, rch->th_seq_num);
1834
1835         if (rc != 0)
1836                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1837
1838 done:
1839         return;
1840 }
1841
1842
1843 /*
1844  * The ctcmpc statemachine for a channel.
1845  */
1846
1847 const fsm_node ctcmpc_ch_fsm[] = {
1848         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1849         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1850         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1851         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1852         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1853
1854         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1855         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1856         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1857         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1858         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1859         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1860         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1861         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1862
1863         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1864         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1865         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1866         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1867         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1868         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1869
1870         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1871         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1872         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1873         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1874         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1875
1876         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1877         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1878         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1879         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1880         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1881         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1882         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1883         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1884
1885         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1886         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1887         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1888         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1889         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1890         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1891         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1892         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1893         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1894         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1895
1896         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1897         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1898         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1899         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1900         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1901         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1902         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1903         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1904         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1905         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1906
1907         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1908         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1909         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1910         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1911         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1912         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1913         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1914         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1915         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1916         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1917         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1918
1919         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1920         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1921         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1922         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1923         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1924         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1925         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1926         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1927         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1928         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1929         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1930         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1931         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1932
1933         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1934         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1935         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1936         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1937         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1938         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1939         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1940         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1941         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1942         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1943         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1944         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1945
1946         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1947         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1948         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1949         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1950         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1951         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1952         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1953         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1954         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1955         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1956         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1957         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1958
1959         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1960         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1961         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1962         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1963         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1964         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1965         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1966         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1967         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1968         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1969         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1970         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1971
1972         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1973         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1974         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1975         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1976         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1977         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1978         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1979         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1980         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1981         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1982         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1983         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1984
1985         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1986         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1987         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1988         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1989         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
1990         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1991         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1992         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1993
1994         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1995         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1996         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1997         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1998         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1999         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2000         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2001         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2002         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2003
2004         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2005         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2006         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2007         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2008         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2009         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2010         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2011         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2012
2013         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2014         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2015         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2016         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2017         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2018         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2019         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2020         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2021
2022         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2023         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2024         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2025         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2026         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2027         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2028         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2029
2030         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2031         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2032         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2033         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2034         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2035         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2036         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2037         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2038         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2039         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2040
2041         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2042         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2043         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2044         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2045         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2046 };
2047
2048 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2049
2050 /*
2051  * Actions for interface - statemachine.
2052  */
2053
2054 /**
2055  * Startup channels by sending CTC_EVENT_START to each channel.
2056  *
2057  * fi           An instance of an interface statemachine.
2058  * event        The event, just happened.
2059  * arg          Generic pointer, casted from struct net_device * upon call.
2060  */
2061 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2062 {
2063         struct net_device *dev = arg;
2064         struct ctcm_priv *priv = dev->ml_priv;
2065         int direction;
2066
2067         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2068
2069         fsm_deltimer(&priv->restart_timer);
2070         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2071         if (IS_MPC(priv))
2072                 priv->mpcg->channels_terminating = 0;
2073         for (direction = READ; direction <= WRITE; direction++) {
2074                 struct channel *ch = priv->channel[direction];
2075                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2076         }
2077 }
2078
2079 /**
2080  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2081  *
2082  * fi           An instance of an interface statemachine.
2083  * event        The event, just happened.
2084  * arg          Generic pointer, casted from struct net_device * upon call.
2085  */
2086 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2087 {
2088         int direction;
2089         struct net_device *dev = arg;
2090         struct ctcm_priv *priv = dev->ml_priv;
2091
2092         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2093
2094         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2095         for (direction = READ; direction <= WRITE; direction++) {
2096                 struct channel *ch = priv->channel[direction];
2097                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2098                 ch->th_seq_num = 0x00;
2099                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2100                                 __func__, ch->th_seq_num);
2101         }
2102         if (IS_MPC(priv))
2103                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2104 }
2105
2106 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2107 {
2108         int restart_timer;
2109         struct net_device *dev = arg;
2110         struct ctcm_priv *priv = dev->ml_priv;
2111
2112         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2113
2114         if (IS_MPC(priv)) {
2115                 restart_timer = CTCM_TIME_1_SEC;
2116         } else {
2117                 restart_timer = CTCM_TIME_5_SEC;
2118         }
2119         dev_info(&dev->dev, "Restarting device\n");
2120
2121         dev_action_stop(fi, event, arg);
2122         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2123         if (IS_MPC(priv))
2124                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2125
2126         /* going back into start sequence too quickly can         */
2127         /* result in the other side becoming unreachable   due    */
2128         /* to sense reported when IO is aborted                   */
2129         fsm_addtimer(&priv->restart_timer, restart_timer,
2130                         DEV_EVENT_START, dev);
2131 }
2132
2133 /**
2134  * Called from channel statemachine
2135  * when a channel is up and running.
2136  *
2137  * fi           An instance of an interface statemachine.
2138  * event        The event, just happened.
2139  * arg          Generic pointer, casted from struct net_device * upon call.
2140  */
2141 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2142 {
2143         struct net_device *dev = arg;
2144         struct ctcm_priv *priv = dev->ml_priv;
2145         int dev_stat = fsm_getstate(fi);
2146
2147         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2148                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2149                                 dev->name, dev->ml_priv, dev_stat, event);
2150
2151         switch (fsm_getstate(fi)) {
2152         case DEV_STATE_STARTWAIT_RXTX:
2153                 if (event == DEV_EVENT_RXUP)
2154                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2155                 else
2156                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2157                 break;
2158         case DEV_STATE_STARTWAIT_RX:
2159                 if (event == DEV_EVENT_RXUP) {
2160                         fsm_newstate(fi, DEV_STATE_RUNNING);
2161                         dev_info(&dev->dev,
2162                                 "Connected with remote side\n");
2163                         ctcm_clear_busy(dev);
2164                 }
2165                 break;
2166         case DEV_STATE_STARTWAIT_TX:
2167                 if (event == DEV_EVENT_TXUP) {
2168                         fsm_newstate(fi, DEV_STATE_RUNNING);
2169                         dev_info(&dev->dev,
2170                                 "Connected with remote side\n");
2171                         ctcm_clear_busy(dev);
2172                 }
2173                 break;
2174         case DEV_STATE_STOPWAIT_TX:
2175                 if (event == DEV_EVENT_RXUP)
2176                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2177                 break;
2178         case DEV_STATE_STOPWAIT_RX:
2179                 if (event == DEV_EVENT_TXUP)
2180                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2181                 break;
2182         }
2183
2184         if (IS_MPC(priv)) {
2185                 if (event == DEV_EVENT_RXUP)
2186                         mpc_channel_action(priv->channel[READ],
2187                                 READ, MPC_CHANNEL_ADD);
2188                 else
2189                         mpc_channel_action(priv->channel[WRITE],
2190                                 WRITE, MPC_CHANNEL_ADD);
2191         }
2192 }
2193
2194 /**
2195  * Called from device statemachine
2196  * when a channel has been shutdown.
2197  *
2198  * fi           An instance of an interface statemachine.
2199  * event        The event, just happened.
2200  * arg          Generic pointer, casted from struct net_device * upon call.
2201  */
2202 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2203 {
2204
2205         struct net_device *dev = arg;
2206         struct ctcm_priv *priv = dev->ml_priv;
2207
2208         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2209
2210         switch (fsm_getstate(fi)) {
2211         case DEV_STATE_RUNNING:
2212                 if (event == DEV_EVENT_TXDOWN)
2213                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2214                 else
2215                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2216                 break;
2217         case DEV_STATE_STARTWAIT_RX:
2218                 if (event == DEV_EVENT_TXDOWN)
2219                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2220                 break;
2221         case DEV_STATE_STARTWAIT_TX:
2222                 if (event == DEV_EVENT_RXDOWN)
2223                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2224                 break;
2225         case DEV_STATE_STOPWAIT_RXTX:
2226                 if (event == DEV_EVENT_TXDOWN)
2227                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2228                 else
2229                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2230                 break;
2231         case DEV_STATE_STOPWAIT_RX:
2232                 if (event == DEV_EVENT_RXDOWN)
2233                         fsm_newstate(fi, DEV_STATE_STOPPED);
2234                 break;
2235         case DEV_STATE_STOPWAIT_TX:
2236                 if (event == DEV_EVENT_TXDOWN)
2237                         fsm_newstate(fi, DEV_STATE_STOPPED);
2238                 break;
2239         }
2240         if (IS_MPC(priv)) {
2241                 if (event == DEV_EVENT_RXDOWN)
2242                         mpc_channel_action(priv->channel[READ],
2243                                 READ, MPC_CHANNEL_REMOVE);
2244                 else
2245                         mpc_channel_action(priv->channel[WRITE],
2246                                 WRITE, MPC_CHANNEL_REMOVE);
2247         }
2248 }
2249
2250 const fsm_node dev_fsm[] = {
2251         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2252         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2253         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2254         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2255         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2256         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2257         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2258         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2259         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2260         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2261         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2262         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2263         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2264         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2265         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2266         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2267         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2268         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2269         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2270         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2271         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2272         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2273         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2274         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2275         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2276         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2277         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2278         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2279         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2280         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2281         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2282         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2283         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2284         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2285         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2286         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2287         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2288 };
2289
2290 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2291
2292 /* --- This is the END my friend --- */
2293