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Linux 4.1.16
[linux/fpc-iii.git] / drivers / s390 / net / ctcm_fsms.c
blobfd5944bbe224964a5afce64c1a82ba4d33c27dc2
1 /*
2 * Copyright IBM Corp. 2001, 2007
3 * Authors: Fritz Elfert (felfert@millenux.com)
4 * Peter Tiedemann (ptiedem@de.ibm.com)
5 * MPC additions :
6 * Belinda Thompson (belindat@us.ibm.com)
7 * Andy Richter (richtera@us.ibm.com)
8 */
9
10 #undef DEBUG
11 #undef DEBUGDATA
12 #undef DEBUGCCW
13
14 #define KMSG_COMPONENT "ctcm"
15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/kernel.h>
20 #include <linux/slab.h>
21 #include <linux/errno.h>
22 #include <linux/types.h>
23 #include <linux/interrupt.h>
24 #include <linux/timer.h>
25 #include <linux/bitops.h>
26
27 #include <linux/signal.h>
28 #include <linux/string.h>
29
30 #include <linux/ip.h>
31 #include <linux/if_arp.h>
32 #include <linux/tcp.h>
33 #include <linux/skbuff.h>
34 #include <linux/ctype.h>
35 #include <net/dst.h>
36
37 #include <linux/io.h>
38 #include <asm/ccwdev.h>
39 #include <asm/ccwgroup.h>
40 #include <linux/uaccess.h>
41
42 #include <asm/idals.h>
43
44 #include "fsm.h"
45
46 #include "ctcm_dbug.h"
47 #include "ctcm_main.h"
48 #include "ctcm_fsms.h"
49
50 const char *dev_state_names[] = {
51 [DEV_STATE_STOPPED] = "Stopped",
52 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
53 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
54 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
55 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
56 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
57 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
58 [DEV_STATE_RUNNING] = "Running",
59 };
60
61 const char *dev_event_names[] = {
62 [DEV_EVENT_START] = "Start",
63 [DEV_EVENT_STOP] = "Stop",
64 [DEV_EVENT_RXUP] = "RX up",
65 [DEV_EVENT_TXUP] = "TX up",
66 [DEV_EVENT_RXDOWN] = "RX down",
67 [DEV_EVENT_TXDOWN] = "TX down",
68 [DEV_EVENT_RESTART] = "Restart",
69 };
70
71 const char *ctc_ch_event_names[] = {
72 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
73 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
74 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
75 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
76 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
77 [CTC_EVENT_ATTN] = "Status ATTN",
78 [CTC_EVENT_BUSY] = "Status BUSY",
79 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
80 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
81 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
82 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
83 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
84 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
85 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
86 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
87 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
88 [CTC_EVENT_MC_FAIL] = "Machine check failure",
89 [CTC_EVENT_MC_GOOD] = "Machine check operational",
90 [CTC_EVENT_IRQ] = "IRQ normal",
91 [CTC_EVENT_FINSTAT] = "IRQ final",
92 [CTC_EVENT_TIMER] = "Timer",
93 [CTC_EVENT_START] = "Start",
94 [CTC_EVENT_STOP] = "Stop",
95 /*
96 * additional MPC events
97 */
98 [CTC_EVENT_SEND_XID] = "XID Exchange",
99 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
100 };
101
102 const char *ctc_ch_state_names[] = {
103 [CTC_STATE_IDLE] = "Idle",
104 [CTC_STATE_STOPPED] = "Stopped",
105 [CTC_STATE_STARTWAIT] = "StartWait",
106 [CTC_STATE_STARTRETRY] = "StartRetry",
107 [CTC_STATE_SETUPWAIT] = "SetupWait",
108 [CTC_STATE_RXINIT] = "RX init",
109 [CTC_STATE_TXINIT] = "TX init",
110 [CTC_STATE_RX] = "RX",
111 [CTC_STATE_TX] = "TX",
112 [CTC_STATE_RXIDLE] = "RX idle",
113 [CTC_STATE_TXIDLE] = "TX idle",
114 [CTC_STATE_RXERR] = "RX error",
115 [CTC_STATE_TXERR] = "TX error",
116 [CTC_STATE_TERM] = "Terminating",
117 [CTC_STATE_DTERM] = "Restarting",
118 [CTC_STATE_NOTOP] = "Not operational",
119 /*
120 * additional MPC states
121 */
122 [CH_XID0_PENDING] = "Pending XID0 Start",
123 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
124 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
125 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
126 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
127 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
128 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
129 };
130
131 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
132
133 /*
134 * ----- static ctcm actions for channel statemachine -----
135 *
136 */
137 static void chx_txdone(fsm_instance *fi, int event, void *arg);
138 static void chx_rx(fsm_instance *fi, int event, void *arg);
139 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
140 static void chx_firstio(fsm_instance *fi, int event, void *arg);
141 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
142 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
143 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
144 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
145 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
146 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
147 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
148 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
149 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
150 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
151 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
152 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
153 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
154 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
155
156 /*
157 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
158 *
159 */
160 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
161 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
162 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
163 /* shared :
164 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
165 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
166 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
167 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
168 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
169 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
170 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
171 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
172 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
173 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
174 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
175 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
176 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
177 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
178 */
179 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
180 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
181 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
182 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
183
184 /**
185 * Check return code of a preceding ccw_device call, halt_IO etc...
186 *
187 * ch : The channel, the error belongs to.
188 * Returns the error code (!= 0) to inspect.
189 */
190 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
191 {
192 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
193 "%s(%s): %s: %04x\n",
194 CTCM_FUNTAIL, ch->id, msg, rc);
195 switch (rc) {
196 case -EBUSY:
197 pr_info("%s: The communication peer is busy\n",
198 ch->id);
199 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
200 break;
201 case -ENODEV:
202 pr_err("%s: The specified target device is not valid\n",
203 ch->id);
204 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
205 break;
206 default:
207 pr_err("An I/O operation resulted in error %04x\n",
208 rc);
209 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
210 }
211 }
212
213 void ctcm_purge_skb_queue(struct sk_buff_head *q)
214 {
215 struct sk_buff *skb;
216
217 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
218
219 while ((skb = skb_dequeue(q))) {
220 atomic_dec(&skb->users);
221 dev_kfree_skb_any(skb);
222 }
223 }
224
225 /**
226 * NOP action for statemachines
227 */
228 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
229 {
230 }
231
232 /*
233 * Actions for channel - statemachines.
234 */
235
236 /**
237 * Normal data has been send. Free the corresponding
238 * skb (it's in io_queue), reset dev->tbusy and
239 * revert to idle state.
240 *
241 * fi An instance of a channel statemachine.
242 * event The event, just happened.
243 * arg Generic pointer, casted from channel * upon call.
244 */
245 static void chx_txdone(fsm_instance *fi, int event, void *arg)
246 {
247 struct channel *ch = arg;
248 struct net_device *dev = ch->netdev;
249 struct ctcm_priv *priv = dev->ml_priv;
250 struct sk_buff *skb;
251 int first = 1;
252 int i;
253 unsigned long duration;
254 unsigned long done_stamp = jiffies;
255
256 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
257
258 duration = done_stamp - ch->prof.send_stamp;
259 if (duration > ch->prof.tx_time)
260 ch->prof.tx_time = duration;
261
262 if (ch->irb->scsw.cmd.count != 0)
263 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
264 "%s(%s): TX not complete, remaining %d bytes",
265 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
266 fsm_deltimer(&ch->timer);
267 while ((skb = skb_dequeue(&ch->io_queue))) {
268 priv->stats.tx_packets++;
269 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
270 if (first) {
271 priv->stats.tx_bytes += 2;
272 first = 0;
273 }
274 atomic_dec(&skb->users);
275 dev_kfree_skb_irq(skb);
276 }
277 spin_lock(&ch->collect_lock);
278 clear_normalized_cda(&ch->ccw[4]);
279 if (ch->collect_len > 0) {
280 int rc;
281
282 if (ctcm_checkalloc_buffer(ch)) {
283 spin_unlock(&ch->collect_lock);
284 return;
285 }
286 ch->trans_skb->data = ch->trans_skb_data;
287 skb_reset_tail_pointer(ch->trans_skb);
288 ch->trans_skb->len = 0;
289 if (ch->prof.maxmulti < (ch->collect_len + 2))
290 ch->prof.maxmulti = ch->collect_len + 2;
291 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
292 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
293 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
294 i = 0;
295 while ((skb = skb_dequeue(&ch->collect_queue))) {
296 skb_copy_from_linear_data(skb,
297 skb_put(ch->trans_skb, skb->len), skb->len);
298 priv->stats.tx_packets++;
299 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
300 atomic_dec(&skb->users);
301 dev_kfree_skb_irq(skb);
302 i++;
303 }
304 ch->collect_len = 0;
305 spin_unlock(&ch->collect_lock);
306 ch->ccw[1].count = ch->trans_skb->len;
307 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
308 ch->prof.send_stamp = jiffies;
309 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
310 (unsigned long)ch, 0xff, 0);
311 ch->prof.doios_multi++;
312 if (rc != 0) {
313 priv->stats.tx_dropped += i;
314 priv->stats.tx_errors += i;
315 fsm_deltimer(&ch->timer);
316 ctcm_ccw_check_rc(ch, rc, "chained TX");
317 }
318 } else {
319 spin_unlock(&ch->collect_lock);
320 fsm_newstate(fi, CTC_STATE_TXIDLE);
321 }
322 ctcm_clear_busy_do(dev);
323 }
324
325 /**
326 * Initial data is sent.
327 * Notify device statemachine that we are up and
328 * running.
329 *
330 * fi An instance of a channel statemachine.
331 * event The event, just happened.
332 * arg Generic pointer, casted from channel * upon call.
333 */
334 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
335 {
336 struct channel *ch = arg;
337 struct net_device *dev = ch->netdev;
338 struct ctcm_priv *priv = dev->ml_priv;
339
340 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
341
342 fsm_deltimer(&ch->timer);
343 fsm_newstate(fi, CTC_STATE_TXIDLE);
344 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
345 }
346
347 /**
348 * Got normal data, check for sanity, queue it up, allocate new buffer
349 * trigger bottom half, and initiate next read.
350 *
351 * fi An instance of a channel statemachine.
352 * event The event, just happened.
353 * arg Generic pointer, casted from channel * upon call.
354 */
355 static void chx_rx(fsm_instance *fi, int event, void *arg)
356 {
357 struct channel *ch = arg;
358 struct net_device *dev = ch->netdev;
359 struct ctcm_priv *priv = dev->ml_priv;
360 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
361 struct sk_buff *skb = ch->trans_skb;
362 __u16 block_len = *((__u16 *)skb->data);
363 int check_len;
364 int rc;
365
366 fsm_deltimer(&ch->timer);
367 if (len < 8) {
368 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
369 "%s(%s): got packet with length %d < 8\n",
370 CTCM_FUNTAIL, dev->name, len);
371 priv->stats.rx_dropped++;
372 priv->stats.rx_length_errors++;
373 goto again;
374 }
375 if (len > ch->max_bufsize) {
376 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
377 "%s(%s): got packet with length %d > %d\n",
378 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
379 priv->stats.rx_dropped++;
380 priv->stats.rx_length_errors++;
381 goto again;
382 }
383
384 /*
385 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
386 */
387 switch (ch->protocol) {
388 case CTCM_PROTO_S390:
389 case CTCM_PROTO_OS390:
390 check_len = block_len + 2;
391 break;
392 default:
393 check_len = block_len;
394 break;
395 }
396 if ((len < block_len) || (len > check_len)) {
397 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
398 "%s(%s): got block length %d != rx length %d\n",
399 CTCM_FUNTAIL, dev->name, block_len, len);
400 if (do_debug)
401 ctcmpc_dump_skb(skb, 0);
402
403 *((__u16 *)skb->data) = len;
404 priv->stats.rx_dropped++;
405 priv->stats.rx_length_errors++;
406 goto again;
407 }
408 if (block_len > 2) {
409 *((__u16 *)skb->data) = block_len - 2;
410 ctcm_unpack_skb(ch, skb);
411 }
412 again:
413 skb->data = ch->trans_skb_data;
414 skb_reset_tail_pointer(skb);
415 skb->len = 0;
416 if (ctcm_checkalloc_buffer(ch))
417 return;
418 ch->ccw[1].count = ch->max_bufsize;
419 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
420 (unsigned long)ch, 0xff, 0);
421 if (rc != 0)
422 ctcm_ccw_check_rc(ch, rc, "normal RX");
423 }
424
425 /**
426 * Initialize connection by sending a __u16 of value 0.
427 *
428 * fi An instance of a channel statemachine.
429 * event The event, just happened.
430 * arg Generic pointer, casted from channel * upon call.
431 */
432 static void chx_firstio(fsm_instance *fi, int event, void *arg)
433 {
434 int rc;
435 struct channel *ch = arg;
436 int fsmstate = fsm_getstate(fi);
437
438 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
439 "%s(%s) : %02x",
440 CTCM_FUNTAIL, ch->id, fsmstate);
441
442 ch->sense_rc = 0; /* reset unit check report control */
443 if (fsmstate == CTC_STATE_TXIDLE)
444 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
445 "%s(%s): remote side issued READ?, init.\n",
446 CTCM_FUNTAIL, ch->id);
447 fsm_deltimer(&ch->timer);
448 if (ctcm_checkalloc_buffer(ch))
449 return;
450 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
451 (ch->protocol == CTCM_PROTO_OS390)) {
452 /* OS/390 resp. z/OS */
453 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
454 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
455 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
456 CTC_EVENT_TIMER, ch);
457 chx_rxidle(fi, event, arg);
458 } else {
459 struct net_device *dev = ch->netdev;
460 struct ctcm_priv *priv = dev->ml_priv;
461 fsm_newstate(fi, CTC_STATE_TXIDLE);
462 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
463 }
464 return;
465 }
466 /*
467 * Don't setup a timer for receiving the initial RX frame
468 * if in compatibility mode, since VM TCP delays the initial
469 * frame until it has some data to send.
470 */
471 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
472 (ch->protocol != CTCM_PROTO_S390))
473 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
474
475 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
476 ch->ccw[1].count = 2; /* Transfer only length */
477
478 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
479 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
480 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
481 (unsigned long)ch, 0xff, 0);
482 if (rc != 0) {
483 fsm_deltimer(&ch->timer);
484 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
485 ctcm_ccw_check_rc(ch, rc, "init IO");
486 }
487 /*
488 * If in compatibility mode since we don't setup a timer, we
489 * also signal RX channel up immediately. This enables us
490 * to send packets early which in turn usually triggers some
491 * reply from VM TCP which brings up the RX channel to it's
492 * final state.
493 */
494 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
495 (ch->protocol == CTCM_PROTO_S390)) {
496 struct net_device *dev = ch->netdev;
497 struct ctcm_priv *priv = dev->ml_priv;
498 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
499 }
500 }
501
502 /**
503 * Got initial data, check it. If OK,
504 * notify device statemachine that we are up and
505 * running.
506 *
507 * fi An instance of a channel statemachine.
508 * event The event, just happened.
509 * arg Generic pointer, casted from channel * upon call.
510 */
511 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
512 {
513 struct channel *ch = arg;
514 struct net_device *dev = ch->netdev;
515 struct ctcm_priv *priv = dev->ml_priv;
516 __u16 buflen;
517 int rc;
518
519 fsm_deltimer(&ch->timer);
520 buflen = *((__u16 *)ch->trans_skb->data);
521 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
522 __func__, dev->name, buflen);
523
524 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
525 if (ctcm_checkalloc_buffer(ch))
526 return;
527 ch->ccw[1].count = ch->max_bufsize;
528 fsm_newstate(fi, CTC_STATE_RXIDLE);
529 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
530 (unsigned long)ch, 0xff, 0);
531 if (rc != 0) {
532 fsm_newstate(fi, CTC_STATE_RXINIT);
533 ctcm_ccw_check_rc(ch, rc, "initial RX");
534 } else
535 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
536 } else {
537 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
538 __func__, dev->name,
539 buflen, CTCM_INITIAL_BLOCKLEN);
540 chx_firstio(fi, event, arg);
541 }
542 }
543
544 /**
545 * Set channel into extended mode.
546 *
547 * fi An instance of a channel statemachine.
548 * event The event, just happened.
549 * arg Generic pointer, casted from channel * upon call.
550 */
551 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
552 {
553 struct channel *ch = arg;
554 int rc;
555 unsigned long saveflags = 0;
556 int timeout = CTCM_TIME_5_SEC;
557
558 fsm_deltimer(&ch->timer);
559 if (IS_MPC(ch)) {
560 timeout = 1500;
561 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
562 __func__, smp_processor_id(), ch, ch->id);
563 }
564 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
565 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
566 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
567
568 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
569 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
570 /* Such conditional locking is undeterministic in
571 * static view. => ignore sparse warnings here. */
572
573 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
574 (unsigned long)ch, 0xff, 0);
575 if (event == CTC_EVENT_TIMER) /* see above comments */
576 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
577 if (rc != 0) {
578 fsm_deltimer(&ch->timer);
579 fsm_newstate(fi, CTC_STATE_STARTWAIT);
580 ctcm_ccw_check_rc(ch, rc, "set Mode");
581 } else
582 ch->retry = 0;
583 }
584
585 /**
586 * Setup channel.
587 *
588 * fi An instance of a channel statemachine.
589 * event The event, just happened.
590 * arg Generic pointer, casted from channel * upon call.
591 */
592 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
593 {
594 struct channel *ch = arg;
595 unsigned long saveflags;
596 int rc;
597
598 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
599 CTCM_FUNTAIL, ch->id,
600 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
601
602 if (ch->trans_skb != NULL) {
603 clear_normalized_cda(&ch->ccw[1]);
604 dev_kfree_skb(ch->trans_skb);
605 ch->trans_skb = NULL;
606 }
607 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
608 ch->ccw[1].cmd_code = CCW_CMD_READ;
609 ch->ccw[1].flags = CCW_FLAG_SLI;
610 ch->ccw[1].count = 0;
611 } else {
612 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
613 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
614 ch->ccw[1].count = 0;
615 }
616 if (ctcm_checkalloc_buffer(ch)) {
617 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
618 "%s(%s): %s trans_skb alloc delayed "
619 "until first transfer",
620 CTCM_FUNTAIL, ch->id,
621 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
622 "RX" : "TX");
623 }
624 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
625 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
626 ch->ccw[0].count = 0;
627 ch->ccw[0].cda = 0;
628 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
629 ch->ccw[2].flags = CCW_FLAG_SLI;
630 ch->ccw[2].count = 0;
631 ch->ccw[2].cda = 0;
632 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
633 ch->ccw[4].cda = 0;
634 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
635
636 fsm_newstate(fi, CTC_STATE_STARTWAIT);
637 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
638 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
639 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
640 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
641 if (rc != 0) {
642 if (rc != -EBUSY)
643 fsm_deltimer(&ch->timer);
644 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
645 }
646 }
647
648 /**
649 * Shutdown a channel.
650 *
651 * fi An instance of a channel statemachine.
652 * event The event, just happened.
653 * arg Generic pointer, casted from channel * upon call.
654 */
655 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
656 {
657 struct channel *ch = arg;
658 unsigned long saveflags = 0;
659 int rc;
660 int oldstate;
661
662 fsm_deltimer(&ch->timer);
663 if (IS_MPC(ch))
664 fsm_deltimer(&ch->sweep_timer);
665
666 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
667
668 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
669 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
670 /* Such conditional locking is undeterministic in
671 * static view. => ignore sparse warnings here. */
672 oldstate = fsm_getstate(fi);
673 fsm_newstate(fi, CTC_STATE_TERM);
674 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
675
676 if (event == CTC_EVENT_STOP)
677 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
678 /* see remark above about conditional locking */
679
680 if (rc != 0 && rc != -EBUSY) {
681 fsm_deltimer(&ch->timer);
682 if (event != CTC_EVENT_STOP) {
683 fsm_newstate(fi, oldstate);
684 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
685 }
686 }
687 }
688
689 /**
690 * Cleanup helper for chx_fail and chx_stopped
691 * cleanup channels queue and notify interface statemachine.
692 *
693 * fi An instance of a channel statemachine.
694 * state The next state (depending on caller).
695 * ch The channel to operate on.
696 */
697 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
698 struct channel *ch)
699 {
700 struct net_device *dev = ch->netdev;
701 struct ctcm_priv *priv = dev->ml_priv;
702
703 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
704 "%s(%s): %s[%d]\n",
705 CTCM_FUNTAIL, dev->name, ch->id, state);
706
707 fsm_deltimer(&ch->timer);
708 if (IS_MPC(ch))
709 fsm_deltimer(&ch->sweep_timer);
710
711 fsm_newstate(fi, state);
712 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
713 clear_normalized_cda(&ch->ccw[1]);
714 dev_kfree_skb_any(ch->trans_skb);
715 ch->trans_skb = NULL;
716 }
717
718 ch->th_seg = 0x00;
719 ch->th_seq_num = 0x00;
720 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
721 skb_queue_purge(&ch->io_queue);
722 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
723 } else {
724 ctcm_purge_skb_queue(&ch->io_queue);
725 if (IS_MPC(ch))
726 ctcm_purge_skb_queue(&ch->sweep_queue);
727 spin_lock(&ch->collect_lock);
728 ctcm_purge_skb_queue(&ch->collect_queue);
729 ch->collect_len = 0;
730 spin_unlock(&ch->collect_lock);
731 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
732 }
733 }
734
735 /**
736 * A channel has successfully been halted.
737 * Cleanup it's queue and notify interface statemachine.
738 *
739 * fi An instance of a channel statemachine.
740 * event The event, just happened.
741 * arg Generic pointer, casted from channel * upon call.
742 */
743 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
744 {
745 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
746 }
747
748 /**
749 * A stop command from device statemachine arrived and we are in
750 * not operational mode. Set state to stopped.
751 *
752 * fi An instance of a channel statemachine.
753 * event The event, just happened.
754 * arg Generic pointer, casted from channel * upon call.
755 */
756 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
757 {
758 fsm_newstate(fi, CTC_STATE_STOPPED);
759 }
760
761 /**
762 * A machine check for no path, not operational status or gone device has
763 * happened.
764 * Cleanup queue and notify interface statemachine.
765 *
766 * fi An instance of a channel statemachine.
767 * event The event, just happened.
768 * arg Generic pointer, casted from channel * upon call.
769 */
770 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
771 {
772 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
773 }
774
775 /**
776 * Handle error during setup of channel.
777 *
778 * fi An instance of a channel statemachine.
779 * event The event, just happened.
780 * arg Generic pointer, casted from channel * upon call.
781 */
782 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
783 {
784 struct channel *ch = arg;
785 struct net_device *dev = ch->netdev;
786 struct ctcm_priv *priv = dev->ml_priv;
787
788 /*
789 * Special case: Got UC_RCRESET on setmode.
790 * This means that remote side isn't setup. In this case
791 * simply retry after some 10 secs...
792 */
793 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
794 ((event == CTC_EVENT_UC_RCRESET) ||
795 (event == CTC_EVENT_UC_RSRESET))) {
796 fsm_newstate(fi, CTC_STATE_STARTRETRY);
797 fsm_deltimer(&ch->timer);
798 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
799 if (!IS_MPC(ch) &&
800 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
801 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
802 if (rc != 0)
803 ctcm_ccw_check_rc(ch, rc,
804 "HaltIO in chx_setuperr");
805 }
806 return;
807 }
808
809 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
810 "%s(%s) : %s error during %s channel setup state=%s\n",
811 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
812 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
813 fsm_getstate_str(fi));
814
815 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
816 fsm_newstate(fi, CTC_STATE_RXERR);
817 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
818 } else {
819 fsm_newstate(fi, CTC_STATE_TXERR);
820 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
821 }
822 }
823
824 /**
825 * Restart a channel after an error.
826 *
827 * fi An instance of a channel statemachine.
828 * event The event, just happened.
829 * arg Generic pointer, casted from channel * upon call.
830 */
831 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
832 {
833 struct channel *ch = arg;
834 struct net_device *dev = ch->netdev;
835 unsigned long saveflags = 0;
836 int oldstate;
837 int rc;
838
839 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
840 "%s: %s[%d] of %s\n",
841 CTCM_FUNTAIL, ch->id, event, dev->name);
842
843 fsm_deltimer(&ch->timer);
844
845 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
846 oldstate = fsm_getstate(fi);
847 fsm_newstate(fi, CTC_STATE_STARTWAIT);
848 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
849 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
850 /* Such conditional locking is a known problem for
851 * sparse because its undeterministic in static view.
852 * Warnings should be ignored here. */
853 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
854 if (event == CTC_EVENT_TIMER)
855 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
856 if (rc != 0) {
857 if (rc != -EBUSY) {
858 fsm_deltimer(&ch->timer);
859 fsm_newstate(fi, oldstate);
860 }
861 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
862 }
863 }
864
865 /**
866 * Handle error during RX initial handshake (exchange of
867 * 0-length block header)
868 *
869 * fi An instance of a channel statemachine.
870 * event The event, just happened.
871 * arg Generic pointer, casted from channel * upon call.
872 */
873 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
874 {
875 struct channel *ch = arg;
876 struct net_device *dev = ch->netdev;
877 struct ctcm_priv *priv = dev->ml_priv;
878
879 if (event == CTC_EVENT_TIMER) {
880 if (!IS_MPCDEV(dev))
881 /* TODO : check if MPC deletes timer somewhere */
882 fsm_deltimer(&ch->timer);
883 if (ch->retry++ < 3)
884 ctcm_chx_restart(fi, event, arg);
885 else {
886 fsm_newstate(fi, CTC_STATE_RXERR);
887 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
888 }
889 } else {
890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
892 ctc_ch_event_names[event], fsm_getstate_str(fi));
893
894 dev_warn(&dev->dev,
895 "Initialization failed with RX/TX init handshake "
896 "error %s\n", ctc_ch_event_names[event]);
897 }
898 }
899
900 /**
901 * Notify device statemachine if we gave up initialization
902 * of RX channel.
903 *
904 * fi An instance of a channel statemachine.
905 * event The event, just happened.
906 * arg Generic pointer, casted from channel * upon call.
907 */
908 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
909 {
910 struct channel *ch = arg;
911 struct net_device *dev = ch->netdev;
912 struct ctcm_priv *priv = dev->ml_priv;
913
914 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
915 "%s(%s): RX %s busy, init. fail",
916 CTCM_FUNTAIL, dev->name, ch->id);
917 fsm_newstate(fi, CTC_STATE_RXERR);
918 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
919 }
920
921 /**
922 * Handle RX Unit check remote reset (remote disconnected)
923 *
924 * fi An instance of a channel statemachine.
925 * event The event, just happened.
926 * arg Generic pointer, casted from channel * upon call.
927 */
928 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
929 {
930 struct channel *ch = arg;
931 struct channel *ch2;
932 struct net_device *dev = ch->netdev;
933 struct ctcm_priv *priv = dev->ml_priv;
934
935 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
936 "%s: %s: remote disconnect - re-init ...",
937 CTCM_FUNTAIL, dev->name);
938 fsm_deltimer(&ch->timer);
939 /*
940 * Notify device statemachine
941 */
942 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
943 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
944
945 fsm_newstate(fi, CTC_STATE_DTERM);
946 ch2 = priv->channel[CTCM_WRITE];
947 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
948
949 ccw_device_halt(ch->cdev, (unsigned long)ch);
950 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
951 }
952
953 /**
954 * Handle error during TX channel initialization.
955 *
956 * fi An instance of a channel statemachine.
957 * event The event, just happened.
958 * arg Generic pointer, casted from channel * upon call.
959 */
960 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
961 {
962 struct channel *ch = arg;
963 struct net_device *dev = ch->netdev;
964 struct ctcm_priv *priv = dev->ml_priv;
965
966 if (event == CTC_EVENT_TIMER) {
967 fsm_deltimer(&ch->timer);
968 if (ch->retry++ < 3)
969 ctcm_chx_restart(fi, event, arg);
970 else {
971 fsm_newstate(fi, CTC_STATE_TXERR);
972 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
973 }
974 } else {
975 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
976 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
977 ctc_ch_event_names[event], fsm_getstate_str(fi));
978
979 dev_warn(&dev->dev,
980 "Initialization failed with RX/TX init handshake "
981 "error %s\n", ctc_ch_event_names[event]);
982 }
983 }
984
985 /**
986 * Handle TX timeout by retrying operation.
987 *
988 * fi An instance of a channel statemachine.
989 * event The event, just happened.
990 * arg Generic pointer, casted from channel * upon call.
991 */
992 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
993 {
994 struct channel *ch = arg;
995 struct net_device *dev = ch->netdev;
996 struct ctcm_priv *priv = dev->ml_priv;
997 struct sk_buff *skb;
998
999 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1000 __func__, smp_processor_id(), ch, ch->id);
1001
1002 fsm_deltimer(&ch->timer);
1003 if (ch->retry++ > 3) {
1004 struct mpc_group *gptr = priv->mpcg;
1005 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1006 "%s: %s: retries exceeded",
1007 CTCM_FUNTAIL, ch->id);
1008 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1009 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1010 use gptr as mpc indicator */
1011 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1012 ctcm_chx_restart(fi, event, arg);
1013 goto done;
1014 }
1015
1016 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1017 "%s : %s: retry %d",
1018 CTCM_FUNTAIL, ch->id, ch->retry);
1019 skb = skb_peek(&ch->io_queue);
1020 if (skb) {
1021 int rc = 0;
1022 unsigned long saveflags = 0;
1023 clear_normalized_cda(&ch->ccw[4]);
1024 ch->ccw[4].count = skb->len;
1025 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1026 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1027 "%s: %s: IDAL alloc failed",
1028 CTCM_FUNTAIL, ch->id);
1029 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1030 ctcm_chx_restart(fi, event, arg);
1031 goto done;
1032 }
1033 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1034 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1035 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1036 /* Such conditional locking is a known problem for
1037 * sparse because its undeterministic in static view.
1038 * Warnings should be ignored here. */
1039 if (do_debug_ccw)
1040 ctcmpc_dumpit((char *)&ch->ccw[3],
1041 sizeof(struct ccw1) * 3);
1042
1043 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1044 (unsigned long)ch, 0xff, 0);
1045 if (event == CTC_EVENT_TIMER)
1046 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1047 saveflags);
1048 if (rc != 0) {
1049 fsm_deltimer(&ch->timer);
1050 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1051 ctcm_purge_skb_queue(&ch->io_queue);
1052 }
1053 }
1054 done:
1055 return;
1056 }
1057
1058 /**
1059 * Handle fatal errors during an I/O command.
1060 *
1061 * fi An instance of a channel statemachine.
1062 * event The event, just happened.
1063 * arg Generic pointer, casted from channel * upon call.
1064 */
1065 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1066 {
1067 struct channel *ch = arg;
1068 struct net_device *dev = ch->netdev;
1069 struct ctcm_priv *priv = dev->ml_priv;
1070 int rd = CHANNEL_DIRECTION(ch->flags);
1071
1072 fsm_deltimer(&ch->timer);
1073 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1074 "%s: %s: %s unrecoverable channel error",
1075 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1076
1077 if (IS_MPC(ch)) {
1078 priv->stats.tx_dropped++;
1079 priv->stats.tx_errors++;
1080 }
1081 if (rd == CTCM_READ) {
1082 fsm_newstate(fi, CTC_STATE_RXERR);
1083 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1084 } else {
1085 fsm_newstate(fi, CTC_STATE_TXERR);
1086 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1087 }
1088 }
1089
1090 /*
1091 * The ctcm statemachine for a channel.
1092 */
1093 const fsm_node ch_fsm[] = {
1094 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1095 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1096 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1097 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1098
1099 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1100 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1101 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1102 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1103 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1104
1105 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1106 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1107 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1108 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1109 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1110 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1111
1112 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1113 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1114 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1115 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1116
1117 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1125
1126 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1127 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1128 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1129 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1130 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1131 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1132 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1133 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1134 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1135 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1136
1137 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1138 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1139 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1140 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1141 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1142 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1143 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1144
1145 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1146 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1147 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1148 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1149 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1150 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1151 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1152 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1153
1154 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1155 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1156 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1157 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1158 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1159 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1160 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1161
1162 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1163 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1164 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1165 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1166 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1167 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1168
1169 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1170 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1171 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1172 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1173 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1174 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1175
1176 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1177 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1178 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1179 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1180 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1181 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1182 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1183 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1184
1185 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1186 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1187 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1188 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1189 };
1190
1191 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1192
1193 /*
1194 * MPC actions for mpc channel statemachine
1195 * handling of MPC protocol requires extra
1196 * statemachine and actions which are prefixed ctcmpc_ .
1197 * The ctc_ch_states and ctc_ch_state_names,
1198 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1199 * which are expanded by some elements.
1200 */
1201
1202 /*
1203 * Actions for mpc channel statemachine.
1204 */
1205
1206 /**
1207 * Normal data has been send. Free the corresponding
1208 * skb (it's in io_queue), reset dev->tbusy and
1209 * revert to idle state.
1210 *
1211 * fi An instance of a channel statemachine.
1212 * event The event, just happened.
1213 * arg Generic pointer, casted from channel * upon call.
1214 */
1215 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1216 {
1217 struct channel *ch = arg;
1218 struct net_device *dev = ch->netdev;
1219 struct ctcm_priv *priv = dev->ml_priv;
1220 struct mpc_group *grp = priv->mpcg;
1221 struct sk_buff *skb;
1222 int first = 1;
1223 int i;
1224 __u32 data_space;
1225 unsigned long duration;
1226 struct sk_buff *peekskb;
1227 int rc;
1228 struct th_header *header;
1229 struct pdu *p_header;
1230 unsigned long done_stamp = jiffies;
1231
1232 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1233 __func__, dev->name, smp_processor_id());
1234
1235 duration = done_stamp - ch->prof.send_stamp;
1236 if (duration > ch->prof.tx_time)
1237 ch->prof.tx_time = duration;
1238
1239 if (ch->irb->scsw.cmd.count != 0)
1240 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1241 "%s(%s): TX not complete, remaining %d bytes",
1242 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1243 fsm_deltimer(&ch->timer);
1244 while ((skb = skb_dequeue(&ch->io_queue))) {
1245 priv->stats.tx_packets++;
1246 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1247 if (first) {
1248 priv->stats.tx_bytes += 2;
1249 first = 0;
1250 }
1251 atomic_dec(&skb->users);
1252 dev_kfree_skb_irq(skb);
1253 }
1254 spin_lock(&ch->collect_lock);
1255 clear_normalized_cda(&ch->ccw[4]);
1256 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1257 spin_unlock(&ch->collect_lock);
1258 fsm_newstate(fi, CTC_STATE_TXIDLE);
1259 goto done;
1260 }
1261
1262 if (ctcm_checkalloc_buffer(ch)) {
1263 spin_unlock(&ch->collect_lock);
1264 goto done;
1265 }
1266 ch->trans_skb->data = ch->trans_skb_data;
1267 skb_reset_tail_pointer(ch->trans_skb);
1268 ch->trans_skb->len = 0;
1269 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1270 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1271 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1272 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1273 i = 0;
1274 p_header = NULL;
1275 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1276
1277 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1278 " data_space:%04x\n",
1279 __func__, data_space);
1280
1281 while ((skb = skb_dequeue(&ch->collect_queue))) {
1282 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1283 p_header = (struct pdu *)
1284 (skb_tail_pointer(ch->trans_skb) - skb->len);
1285 p_header->pdu_flag = 0x00;
1286 if (skb->protocol == ntohs(ETH_P_SNAP))
1287 p_header->pdu_flag |= 0x60;
1288 else
1289 p_header->pdu_flag |= 0x20;
1290
1291 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1292 __func__, ch->trans_skb->len);
1293 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1294 " to 32 bytes sent to vtam\n", __func__);
1295 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1296
1297 ch->collect_len -= skb->len;
1298 data_space -= skb->len;
1299 priv->stats.tx_packets++;
1300 priv->stats.tx_bytes += skb->len;
1301 atomic_dec(&skb->users);
1302 dev_kfree_skb_any(skb);
1303 peekskb = skb_peek(&ch->collect_queue);
1304 if (peekskb->len > data_space)
1305 break;
1306 i++;
1307 }
1308 /* p_header points to the last one we handled */
1309 if (p_header)
1310 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1311 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1312 if (!header) {
1313 spin_unlock(&ch->collect_lock);
1314 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1315 goto done;
1316 }
1317 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1318 ch->th_seq_num++;
1319 header->th_seq_num = ch->th_seq_num;
1320
1321 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1322 __func__, ch->th_seq_num);
1323
1324 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1325 TH_HEADER_LENGTH); /* put the TH on the packet */
1326
1327 kfree(header);
1328
1329 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1330 __func__, ch->trans_skb->len);
1331 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1332 "data to vtam from collect_q\n", __func__);
1333 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1334 min_t(int, ch->trans_skb->len, 50));
1335
1336 spin_unlock(&ch->collect_lock);
1337 clear_normalized_cda(&ch->ccw[1]);
1338
1339 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1340 (void *)(unsigned long)ch->ccw[1].cda,
1341 ch->trans_skb->data);
1342 ch->ccw[1].count = ch->max_bufsize;
1343
1344 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1345 dev_kfree_skb_any(ch->trans_skb);
1346 ch->trans_skb = NULL;
1347 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1348 "%s: %s: IDAL alloc failed",
1349 CTCM_FUNTAIL, ch->id);
1350 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1351 return;
1352 }
1353
1354 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1355 (void *)(unsigned long)ch->ccw[1].cda,
1356 ch->trans_skb->data);
1357
1358 ch->ccw[1].count = ch->trans_skb->len;
1359 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1360 ch->prof.send_stamp = jiffies;
1361 if (do_debug_ccw)
1362 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1363 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1364 (unsigned long)ch, 0xff, 0);
1365 ch->prof.doios_multi++;
1366 if (rc != 0) {
1367 priv->stats.tx_dropped += i;
1368 priv->stats.tx_errors += i;
1369 fsm_deltimer(&ch->timer);
1370 ctcm_ccw_check_rc(ch, rc, "chained TX");
1371 }
1372 done:
1373 ctcm_clear_busy(dev);
1374 return;
1375 }
1376
1377 /**
1378 * Got normal data, check for sanity, queue it up, allocate new buffer
1379 * trigger bottom half, and initiate next read.
1380 *
1381 * fi An instance of a channel statemachine.
1382 * event The event, just happened.
1383 * arg Generic pointer, casted from channel * upon call.
1384 */
1385 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1386 {
1387 struct channel *ch = arg;
1388 struct net_device *dev = ch->netdev;
1389 struct ctcm_priv *priv = dev->ml_priv;
1390 struct mpc_group *grp = priv->mpcg;
1391 struct sk_buff *skb = ch->trans_skb;
1392 struct sk_buff *new_skb;
1393 unsigned long saveflags = 0; /* avoids compiler warning */
1394 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1395
1396 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1397 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1398 ch->id, ch->max_bufsize, len);
1399 fsm_deltimer(&ch->timer);
1400
1401 if (skb == NULL) {
1402 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1403 "%s(%s): TRANS_SKB = NULL",
1404 CTCM_FUNTAIL, dev->name);
1405 goto again;
1406 }
1407
1408 if (len < TH_HEADER_LENGTH) {
1409 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1410 "%s(%s): packet length %d to short",
1411 CTCM_FUNTAIL, dev->name, len);
1412 priv->stats.rx_dropped++;
1413 priv->stats.rx_length_errors++;
1414 } else {
1415 /* must have valid th header or game over */
1416 __u32 block_len = len;
1417 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1418 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1419
1420 if (new_skb == NULL) {
1421 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1422 "%s(%d): skb allocation failed",
1423 CTCM_FUNTAIL, dev->name);
1424 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1425 goto again;
1426 }
1427 switch (fsm_getstate(grp->fsm)) {
1428 case MPCG_STATE_RESET:
1429 case MPCG_STATE_INOP:
1430 dev_kfree_skb_any(new_skb);
1431 break;
1432 case MPCG_STATE_FLOWC:
1433 case MPCG_STATE_READY:
1434 memcpy(skb_put(new_skb, block_len),
1435 skb->data, block_len);
1436 skb_queue_tail(&ch->io_queue, new_skb);
1437 tasklet_schedule(&ch->ch_tasklet);
1438 break;
1439 default:
1440 memcpy(skb_put(new_skb, len), skb->data, len);
1441 skb_queue_tail(&ch->io_queue, new_skb);
1442 tasklet_hi_schedule(&ch->ch_tasklet);
1443 break;
1444 }
1445 }
1446
1447 again:
1448 switch (fsm_getstate(grp->fsm)) {
1449 int rc, dolock;
1450 case MPCG_STATE_FLOWC:
1451 case MPCG_STATE_READY:
1452 if (ctcm_checkalloc_buffer(ch))
1453 break;
1454 ch->trans_skb->data = ch->trans_skb_data;
1455 skb_reset_tail_pointer(ch->trans_skb);
1456 ch->trans_skb->len = 0;
1457 ch->ccw[1].count = ch->max_bufsize;
1458 if (do_debug_ccw)
1459 ctcmpc_dumpit((char *)&ch->ccw[0],
1460 sizeof(struct ccw1) * 3);
1461 dolock = !in_irq();
1462 if (dolock)
1463 spin_lock_irqsave(
1464 get_ccwdev_lock(ch->cdev), saveflags);
1465 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1466 (unsigned long)ch, 0xff, 0);
1467 if (dolock) /* see remark about conditional locking */
1468 spin_unlock_irqrestore(
1469 get_ccwdev_lock(ch->cdev), saveflags);
1470 if (rc != 0)
1471 ctcm_ccw_check_rc(ch, rc, "normal RX");
1472 default:
1473 break;
1474 }
1475
1476 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1477 __func__, dev->name, ch, ch->id);
1478
1479 }
1480
1481 /**
1482 * Initialize connection by sending a __u16 of value 0.
1483 *
1484 * fi An instance of a channel statemachine.
1485 * event The event, just happened.
1486 * arg Generic pointer, casted from channel * upon call.
1487 */
1488 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1489 {
1490 struct channel *ch = arg;
1491 struct net_device *dev = ch->netdev;
1492 struct ctcm_priv *priv = dev->ml_priv;
1493 struct mpc_group *gptr = priv->mpcg;
1494
1495 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1496 __func__, ch->id, ch);
1497
1498 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1499 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1500 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1501 fsm_getstate(gptr->fsm), ch->protocol);
1502
1503 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1504 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1505
1506 fsm_deltimer(&ch->timer);
1507 if (ctcm_checkalloc_buffer(ch))
1508 goto done;
1509
1510 switch (fsm_getstate(fi)) {
1511 case CTC_STATE_STARTRETRY:
1512 case CTC_STATE_SETUPWAIT:
1513 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1514 ctcmpc_chx_rxidle(fi, event, arg);
1515 } else {
1516 fsm_newstate(fi, CTC_STATE_TXIDLE);
1517 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1518 }
1519 goto done;
1520 default:
1521 break;
1522 }
1523
1524 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1525 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1526
1527 done:
1528 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1529 __func__, ch->id, ch);
1530 return;
1531 }
1532
1533 /**
1534 * Got initial data, check it. If OK,
1535 * notify device statemachine that we are up and
1536 * running.
1537 *
1538 * fi An instance of a channel statemachine.
1539 * event The event, just happened.
1540 * arg Generic pointer, casted from channel * upon call.
1541 */
1542 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1543 {
1544 struct channel *ch = arg;
1545 struct net_device *dev = ch->netdev;
1546 struct ctcm_priv *priv = dev->ml_priv;
1547 struct mpc_group *grp = priv->mpcg;
1548 int rc;
1549 unsigned long saveflags = 0; /* avoids compiler warning */
1550
1551 fsm_deltimer(&ch->timer);
1552 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1553 __func__, ch->id, dev->name, smp_processor_id(),
1554 fsm_getstate(fi), fsm_getstate(grp->fsm));
1555
1556 fsm_newstate(fi, CTC_STATE_RXIDLE);
1557 /* XID processing complete */
1558
1559 switch (fsm_getstate(grp->fsm)) {
1560 case MPCG_STATE_FLOWC:
1561 case MPCG_STATE_READY:
1562 if (ctcm_checkalloc_buffer(ch))
1563 goto done;
1564 ch->trans_skb->data = ch->trans_skb_data;
1565 skb_reset_tail_pointer(ch->trans_skb);
1566 ch->trans_skb->len = 0;
1567 ch->ccw[1].count = ch->max_bufsize;
1568 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1569 if (event == CTC_EVENT_START)
1570 /* see remark about conditional locking */
1571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1572 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1573 (unsigned long)ch, 0xff, 0);
1574 if (event == CTC_EVENT_START)
1575 spin_unlock_irqrestore(
1576 get_ccwdev_lock(ch->cdev), saveflags);
1577 if (rc != 0) {
1578 fsm_newstate(fi, CTC_STATE_RXINIT);
1579 ctcm_ccw_check_rc(ch, rc, "initial RX");
1580 goto done;
1581 }
1582 break;
1583 default:
1584 break;
1585 }
1586
1587 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1588 done:
1589 return;
1590 }
1591
1592 /*
1593 * ctcmpc channel FSM action
1594 * called from several points in ctcmpc_ch_fsm
1595 * ctcmpc only
1596 */
1597 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1598 {
1599 struct channel *ch = arg;
1600 struct net_device *dev = ch->netdev;
1601 struct ctcm_priv *priv = dev->ml_priv;
1602 struct mpc_group *grp = priv->mpcg;
1603
1604 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1605 __func__, dev->name, ch->id, ch, smp_processor_id(),
1606 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1607
1608 switch (fsm_getstate(grp->fsm)) {
1609 case MPCG_STATE_XID2INITW:
1610 /* ok..start yside xid exchanges */
1611 if (!ch->in_mpcgroup)
1612 break;
1613 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1614 fsm_deltimer(&grp->timer);
1615 fsm_addtimer(&grp->timer,
1616 MPC_XID_TIMEOUT_VALUE,
1617 MPCG_EVENT_TIMER, dev);
1618 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1619
1620 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1621 /* attn rcvd before xid0 processed via bh */
1622 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1623 break;
1624 case MPCG_STATE_XID2INITX:
1625 case MPCG_STATE_XID0IOWAIT:
1626 case MPCG_STATE_XID0IOWAIX:
1627 /* attn rcvd before xid0 processed on ch
1628 but mid-xid0 processing for group */
1629 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1630 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1631 break;
1632 case MPCG_STATE_XID7INITW:
1633 case MPCG_STATE_XID7INITX:
1634 case MPCG_STATE_XID7INITI:
1635 case MPCG_STATE_XID7INITZ:
1636 switch (fsm_getstate(ch->fsm)) {
1637 case CH_XID7_PENDING:
1638 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1639 break;
1640 case CH_XID7_PENDING2:
1641 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1642 break;
1643 }
1644 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1645 break;
1646 }
1647
1648 return;
1649 }
1650
1651 /*
1652 * ctcmpc channel FSM action
1653 * called from one point in ctcmpc_ch_fsm
1654 * ctcmpc only
1655 */
1656 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1657 {
1658 struct channel *ch = arg;
1659 struct net_device *dev = ch->netdev;
1660 struct ctcm_priv *priv = dev->ml_priv;
1661 struct mpc_group *grp = priv->mpcg;
1662
1663 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1664 __func__, dev->name, ch->id,
1665 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1666
1667 fsm_deltimer(&ch->timer);
1668
1669 switch (fsm_getstate(grp->fsm)) {
1670 case MPCG_STATE_XID0IOWAIT:
1671 /* vtam wants to be primary.start yside xid exchanges*/
1672 /* only receive one attn-busy at a time so must not */
1673 /* change state each time */
1674 grp->changed_side = 1;
1675 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1676 break;
1677 case MPCG_STATE_XID2INITW:
1678 if (grp->changed_side == 1) {
1679 grp->changed_side = 2;
1680 break;
1681 }
1682 /* process began via call to establish_conn */
1683 /* so must report failure instead of reverting */
1684 /* back to ready-for-xid passive state */
1685 if (grp->estconnfunc)
1686 goto done;
1687 /* this attnbusy is NOT the result of xside xid */
1688 /* collisions so yside must have been triggered */
1689 /* by an ATTN that was not intended to start XID */
1690 /* processing. Revert back to ready-for-xid and */
1691 /* wait for ATTN interrupt to signal xid start */
1692 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1693 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1694 fsm_deltimer(&grp->timer);
1695 goto done;
1696 }
1697 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1698 goto done;
1699 case MPCG_STATE_XID2INITX:
1700 /* XID2 was received before ATTN Busy for second
1701 channel.Send yside xid for second channel.
1702 */
1703 if (grp->changed_side == 1) {
1704 grp->changed_side = 2;
1705 break;
1706 }
1707 case MPCG_STATE_XID0IOWAIX:
1708 case MPCG_STATE_XID7INITW:
1709 case MPCG_STATE_XID7INITX:
1710 case MPCG_STATE_XID7INITI:
1711 case MPCG_STATE_XID7INITZ:
1712 default:
1713 /* multiple attn-busy indicates too out-of-sync */
1714 /* and they are certainly not being received as part */
1715 /* of valid mpc group negotiations.. */
1716 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1717 goto done;
1718 }
1719
1720 if (grp->changed_side == 1) {
1721 fsm_deltimer(&grp->timer);
1722 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1723 MPCG_EVENT_TIMER, dev);
1724 }
1725 if (ch->in_mpcgroup)
1726 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1727 else
1728 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1729 "%s(%s): channel %s not added to group",
1730 CTCM_FUNTAIL, dev->name, ch->id);
1731
1732 done:
1733 return;
1734 }
1735
1736 /*
1737 * ctcmpc channel FSM action
1738 * called from several points in ctcmpc_ch_fsm
1739 * ctcmpc only
1740 */
1741 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1742 {
1743 struct channel *ch = arg;
1744 struct net_device *dev = ch->netdev;
1745 struct ctcm_priv *priv = dev->ml_priv;
1746 struct mpc_group *grp = priv->mpcg;
1747
1748 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1749 return;
1750 }
1751
1752 /*
1753 * ctcmpc channel FSM action
1754 * called from several points in ctcmpc_ch_fsm
1755 * ctcmpc only
1756 */
1757 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1758 {
1759 struct channel *ach = arg;
1760 struct net_device *dev = ach->netdev;
1761 struct ctcm_priv *priv = dev->ml_priv;
1762 struct mpc_group *grp = priv->mpcg;
1763 struct channel *wch = priv->channel[CTCM_WRITE];
1764 struct channel *rch = priv->channel[CTCM_READ];
1765 struct sk_buff *skb;
1766 struct th_sweep *header;
1767 int rc = 0;
1768 unsigned long saveflags = 0;
1769
1770 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1771 __func__, smp_processor_id(), ach, ach->id);
1772
1773 if (grp->in_sweep == 0)
1774 goto done;
1775
1776 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1777 __func__, wch->th_seq_num);
1778 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1779 __func__, rch->th_seq_num);
1780
1781 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1782 /* give the previous IO time to complete */
1783 fsm_addtimer(&wch->sweep_timer,
1784 200, CTC_EVENT_RSWEEP_TIMER, wch);
1785 goto done;
1786 }
1787
1788 skb = skb_dequeue(&wch->sweep_queue);
1789 if (!skb)
1790 goto done;
1791
1792 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1793 grp->in_sweep = 0;
1794 ctcm_clear_busy_do(dev);
1795 dev_kfree_skb_any(skb);
1796 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1797 goto done;
1798 } else {
1799 atomic_inc(&skb->users);
1800 skb_queue_tail(&wch->io_queue, skb);
1801 }
1802
1803 /* send out the sweep */
1804 wch->ccw[4].count = skb->len;
1805
1806 header = (struct th_sweep *)skb->data;
1807 switch (header->th.th_ch_flag) {
1808 case TH_SWEEP_REQ:
1809 grp->sweep_req_pend_num--;
1810 break;
1811 case TH_SWEEP_RESP:
1812 grp->sweep_rsp_pend_num--;
1813 break;
1814 }
1815
1816 header->sw.th_last_seq = wch->th_seq_num;
1817
1818 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1819 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1820 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1821
1822 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1823 fsm_newstate(wch->fsm, CTC_STATE_TX);
1824
1825 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1826 wch->prof.send_stamp = jiffies;
1827 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1828 (unsigned long) wch, 0xff, 0);
1829 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1830
1831 if ((grp->sweep_req_pend_num == 0) &&
1832 (grp->sweep_rsp_pend_num == 0)) {
1833 grp->in_sweep = 0;
1834 rch->th_seq_num = 0x00;
1835 wch->th_seq_num = 0x00;
1836 ctcm_clear_busy_do(dev);
1837 }
1838
1839 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1840 __func__, wch->th_seq_num, rch->th_seq_num);
1841
1842 if (rc != 0)
1843 ctcm_ccw_check_rc(wch, rc, "send sweep");
1844
1845 done:
1846 return;
1847 }
1848
1849
1850 /*
1851 * The ctcmpc statemachine for a channel.
1852 */
1853
1854 const fsm_node ctcmpc_ch_fsm[] = {
1855 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1856 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1857 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1858 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1859 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1860
1861 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1862 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1863 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1864 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1865 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1866 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1867 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1868 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1869
1870 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1871 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1872 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1873 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1874 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1875 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876
1877 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1878 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1879 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1880 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1881 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1882
1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1885 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1886 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1887 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1888 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1889 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1890 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1891
1892 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1893 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1894 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1895 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1896 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1897 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1898 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1899 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1900 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1901 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1902
1903 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1904 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1905 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1906 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1907 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1908 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1909 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1910 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1911 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1912 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1913
1914 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1915 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1916 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1917 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1918 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1919 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1920 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1921 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1922 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1923 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1924 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1925
1926 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1927 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1928 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1929 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1930 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1931 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1932 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1933 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1934 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1935 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1936 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1937 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1938 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1939
1940 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1941 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1942 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1943 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1944 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1945 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1946 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1947 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1948 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1949 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1950 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1951 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1952
1953 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1954 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1955 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1956 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1957 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1958 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1959 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1960 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1961 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1962 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1963 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1964 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1965
1966 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1967 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1968 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1969 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1970 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1971 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1972 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1973 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1974 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1975 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1976 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1977 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1978
1979 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1980 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1981 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1982 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1983 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1984 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1985 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1986 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1987 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1988 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1989 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1990 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1991
1992 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1993 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1994 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1995 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1996 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1997 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1998 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1999 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2000
2001 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
2002 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
2003 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
2004 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2005 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2006 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2007 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2008 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2009 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2010
2011 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2012 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2013 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2014 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2015 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2016 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2017 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2018 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2019
2020 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2021 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2022 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2023 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2024 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2025 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2026 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2027 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2028
2029 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2030 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2031 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2032 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2033 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2034 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2035 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2036
2037 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2038 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2039 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2040 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2041 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2042 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2043 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2044 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2045 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2046 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2047
2048 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2049 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2050 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2051 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2052 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2053 };
2054
2055 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2056
2057 /*
2058 * Actions for interface - statemachine.
2059 */
2060
2061 /**
2062 * Startup channels by sending CTC_EVENT_START to each channel.
2063 *
2064 * fi An instance of an interface statemachine.
2065 * event The event, just happened.
2066 * arg Generic pointer, casted from struct net_device * upon call.
2067 */
2068 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2069 {
2070 struct net_device *dev = arg;
2071 struct ctcm_priv *priv = dev->ml_priv;
2072 int direction;
2073
2074 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2075
2076 fsm_deltimer(&priv->restart_timer);
2077 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2078 if (IS_MPC(priv))
2079 priv->mpcg->channels_terminating = 0;
2080 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2081 struct channel *ch = priv->channel[direction];
2082 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2083 }
2084 }
2085
2086 /**
2087 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2088 *
2089 * fi An instance of an interface statemachine.
2090 * event The event, just happened.
2091 * arg Generic pointer, casted from struct net_device * upon call.
2092 */
2093 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2094 {
2095 int direction;
2096 struct net_device *dev = arg;
2097 struct ctcm_priv *priv = dev->ml_priv;
2098
2099 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2100
2101 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2102 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2103 struct channel *ch = priv->channel[direction];
2104 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2105 ch->th_seq_num = 0x00;
2106 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2107 __func__, ch->th_seq_num);
2108 }
2109 if (IS_MPC(priv))
2110 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2111 }
2112
2113 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2114 {
2115 int restart_timer;
2116 struct net_device *dev = arg;
2117 struct ctcm_priv *priv = dev->ml_priv;
2118
2119 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2120
2121 if (IS_MPC(priv)) {
2122 restart_timer = CTCM_TIME_1_SEC;
2123 } else {
2124 restart_timer = CTCM_TIME_5_SEC;
2125 }
2126 dev_info(&dev->dev, "Restarting device\n");
2127
2128 dev_action_stop(fi, event, arg);
2129 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2130 if (IS_MPC(priv))
2131 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2132
2133 /* going back into start sequence too quickly can */
2134 /* result in the other side becoming unreachable due */
2135 /* to sense reported when IO is aborted */
2136 fsm_addtimer(&priv->restart_timer, restart_timer,
2137 DEV_EVENT_START, dev);
2138 }
2139
2140 /**
2141 * Called from channel statemachine
2142 * when a channel is up and running.
2143 *
2144 * fi An instance of an interface statemachine.
2145 * event The event, just happened.
2146 * arg Generic pointer, casted from struct net_device * upon call.
2147 */
2148 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2149 {
2150 struct net_device *dev = arg;
2151 struct ctcm_priv *priv = dev->ml_priv;
2152 int dev_stat = fsm_getstate(fi);
2153
2154 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2155 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2156 dev->name, dev->ml_priv, dev_stat, event);
2157
2158 switch (fsm_getstate(fi)) {
2159 case DEV_STATE_STARTWAIT_RXTX:
2160 if (event == DEV_EVENT_RXUP)
2161 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2162 else
2163 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2164 break;
2165 case DEV_STATE_STARTWAIT_RX:
2166 if (event == DEV_EVENT_RXUP) {
2167 fsm_newstate(fi, DEV_STATE_RUNNING);
2168 dev_info(&dev->dev,
2169 "Connected with remote side\n");
2170 ctcm_clear_busy(dev);
2171 }
2172 break;
2173 case DEV_STATE_STARTWAIT_TX:
2174 if (event == DEV_EVENT_TXUP) {
2175 fsm_newstate(fi, DEV_STATE_RUNNING);
2176 dev_info(&dev->dev,
2177 "Connected with remote side\n");
2178 ctcm_clear_busy(dev);
2179 }
2180 break;
2181 case DEV_STATE_STOPWAIT_TX:
2182 if (event == DEV_EVENT_RXUP)
2183 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2184 break;
2185 case DEV_STATE_STOPWAIT_RX:
2186 if (event == DEV_EVENT_TXUP)
2187 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188 break;
2189 }
2190
2191 if (IS_MPC(priv)) {
2192 if (event == DEV_EVENT_RXUP)
2193 mpc_channel_action(priv->channel[CTCM_READ],
2194 CTCM_READ, MPC_CHANNEL_ADD);
2195 else
2196 mpc_channel_action(priv->channel[CTCM_WRITE],
2197 CTCM_WRITE, MPC_CHANNEL_ADD);
2198 }
2199 }
2200
2201 /**
2202 * Called from device statemachine
2203 * when a channel has been shutdown.
2204 *
2205 * fi An instance of an interface statemachine.
2206 * event The event, just happened.
2207 * arg Generic pointer, casted from struct net_device * upon call.
2208 */
2209 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2210 {
2211
2212 struct net_device *dev = arg;
2213 struct ctcm_priv *priv = dev->ml_priv;
2214
2215 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2216
2217 switch (fsm_getstate(fi)) {
2218 case DEV_STATE_RUNNING:
2219 if (event == DEV_EVENT_TXDOWN)
2220 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2221 else
2222 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2223 break;
2224 case DEV_STATE_STARTWAIT_RX:
2225 if (event == DEV_EVENT_TXDOWN)
2226 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2227 break;
2228 case DEV_STATE_STARTWAIT_TX:
2229 if (event == DEV_EVENT_RXDOWN)
2230 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231 break;
2232 case DEV_STATE_STOPWAIT_RXTX:
2233 if (event == DEV_EVENT_TXDOWN)
2234 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2235 else
2236 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2237 break;
2238 case DEV_STATE_STOPWAIT_RX:
2239 if (event == DEV_EVENT_RXDOWN)
2240 fsm_newstate(fi, DEV_STATE_STOPPED);
2241 break;
2242 case DEV_STATE_STOPWAIT_TX:
2243 if (event == DEV_EVENT_TXDOWN)
2244 fsm_newstate(fi, DEV_STATE_STOPPED);
2245 break;
2246 }
2247 if (IS_MPC(priv)) {
2248 if (event == DEV_EVENT_RXDOWN)
2249 mpc_channel_action(priv->channel[CTCM_READ],
2250 CTCM_READ, MPC_CHANNEL_REMOVE);
2251 else
2252 mpc_channel_action(priv->channel[CTCM_WRITE],
2253 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2254 }
2255 }
2256
2257 const fsm_node dev_fsm[] = {
2258 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2259 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2260 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2261 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2262 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2263 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2264 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2265 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2266 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2267 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2268 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2269 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2270 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2271 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2272 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2273 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2274 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2275 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2276 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2277 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2278 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2279 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2280 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2281 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2282 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2283 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2284 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2285 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2286 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2287 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2288 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2289 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2290 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2291 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2292 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2293 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2294 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2295 };
2296
2297 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2298
2299 /* --- This is the END my friend --- */
2300
Linux with added FPC-III support