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CRED: Wrap task credential accesses in the capabilities code
[linux-2.6/mini2440.git] / drivers / s390 / net / ctcm_fsms.c
blob42776550acfd936dc797b473b3e6e74b14f2a4ca
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 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/errno.h>
21 #include <linux/types.h>
22 #include <linux/interrupt.h>
23 #include <linux/timer.h>
24 #include <linux/bitops.h>
25
26 #include <linux/signal.h>
27 #include <linux/string.h>
28
29 #include <linux/ip.h>
30 #include <linux/if_arp.h>
31 #include <linux/tcp.h>
32 #include <linux/skbuff.h>
33 #include <linux/ctype.h>
34 #include <net/dst.h>
35
36 #include <linux/io.h>
37 #include <asm/ccwdev.h>
38 #include <asm/ccwgroup.h>
39 #include <linux/uaccess.h>
40
41 #include <asm/idals.h>
42
43 #include "fsm.h"
44 #include "cu3088.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 preceeding 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 ctcm_pr_warn("%s (%s): Busy !\n", ch->id, msg);
198 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
199 break;
200 case -ENODEV:
201 ctcm_pr_emerg("%s (%s): Invalid device called for IO\n",
202 ch->id, msg);
203 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
204 break;
205 default:
206 ctcm_pr_emerg("%s (%s): Unknown error in do_IO %04x\n",
207 ch->id, msg, rc);
208 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
209 }
210 }
211
212 void ctcm_purge_skb_queue(struct sk_buff_head *q)
213 {
214 struct sk_buff *skb;
215
216 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
217
218 while ((skb = skb_dequeue(q))) {
219 atomic_dec(&skb->users);
220 dev_kfree_skb_any(skb);
221 }
222 }
223
224 /**
225 * NOP action for statemachines
226 */
227 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
228 {
229 }
230
231 /*
232 * Actions for channel - statemachines.
233 */
234
235 /**
236 * Normal data has been send. Free the corresponding
237 * skb (it's in io_queue), reset dev->tbusy and
238 * revert to idle state.
239 *
240 * fi An instance of a channel statemachine.
241 * event The event, just happened.
242 * arg Generic pointer, casted from channel * upon call.
243 */
244 static void chx_txdone(fsm_instance *fi, int event, void *arg)
245 {
246 struct channel *ch = arg;
247 struct net_device *dev = ch->netdev;
248 struct ctcm_priv *priv = dev->ml_priv;
249 struct sk_buff *skb;
250 int first = 1;
251 int i;
252 unsigned long duration;
253 struct timespec done_stamp = current_kernel_time(); /* xtime */
254
255 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
256
257 duration =
258 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
259 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
260 if (duration > ch->prof.tx_time)
261 ch->prof.tx_time = duration;
262
263 if (ch->irb->scsw.cmd.count != 0)
264 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
265 "%s(%s): TX not complete, remaining %d bytes",
266 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
267 fsm_deltimer(&ch->timer);
268 while ((skb = skb_dequeue(&ch->io_queue))) {
269 priv->stats.tx_packets++;
270 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
271 if (first) {
272 priv->stats.tx_bytes += 2;
273 first = 0;
274 }
275 atomic_dec(&skb->users);
276 dev_kfree_skb_irq(skb);
277 }
278 spin_lock(&ch->collect_lock);
279 clear_normalized_cda(&ch->ccw[4]);
280 if (ch->collect_len > 0) {
281 int rc;
282
283 if (ctcm_checkalloc_buffer(ch)) {
284 spin_unlock(&ch->collect_lock);
285 return;
286 }
287 ch->trans_skb->data = ch->trans_skb_data;
288 skb_reset_tail_pointer(ch->trans_skb);
289 ch->trans_skb->len = 0;
290 if (ch->prof.maxmulti < (ch->collect_len + 2))
291 ch->prof.maxmulti = ch->collect_len + 2;
292 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
293 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
294 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
295 i = 0;
296 while ((skb = skb_dequeue(&ch->collect_queue))) {
297 skb_copy_from_linear_data(skb,
298 skb_put(ch->trans_skb, skb->len), skb->len);
299 priv->stats.tx_packets++;
300 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
301 atomic_dec(&skb->users);
302 dev_kfree_skb_irq(skb);
303 i++;
304 }
305 ch->collect_len = 0;
306 spin_unlock(&ch->collect_lock);
307 ch->ccw[1].count = ch->trans_skb->len;
308 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
309 ch->prof.send_stamp = current_kernel_time(); /* xtime */
310 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
311 (unsigned long)ch, 0xff, 0);
312 ch->prof.doios_multi++;
313 if (rc != 0) {
314 priv->stats.tx_dropped += i;
315 priv->stats.tx_errors += i;
316 fsm_deltimer(&ch->timer);
317 ctcm_ccw_check_rc(ch, rc, "chained TX");
318 }
319 } else {
320 spin_unlock(&ch->collect_lock);
321 fsm_newstate(fi, CTC_STATE_TXIDLE);
322 }
323 ctcm_clear_busy_do(dev);
324 }
325
326 /**
327 * Initial data is sent.
328 * Notify device statemachine that we are up and
329 * running.
330 *
331 * fi An instance of a channel statemachine.
332 * event The event, just happened.
333 * arg Generic pointer, casted from channel * upon call.
334 */
335 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
336 {
337 struct channel *ch = arg;
338 struct net_device *dev = ch->netdev;
339 struct ctcm_priv *priv = dev->ml_priv;
340
341 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
342
343 fsm_deltimer(&ch->timer);
344 fsm_newstate(fi, CTC_STATE_TXIDLE);
345 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
346 }
347
348 /**
349 * Got normal data, check for sanity, queue it up, allocate new buffer
350 * trigger bottom half, and initiate next read.
351 *
352 * fi An instance of a channel statemachine.
353 * event The event, just happened.
354 * arg Generic pointer, casted from channel * upon call.
355 */
356 static void chx_rx(fsm_instance *fi, int event, void *arg)
357 {
358 struct channel *ch = arg;
359 struct net_device *dev = ch->netdev;
360 struct ctcm_priv *priv = dev->ml_priv;
361 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
362 struct sk_buff *skb = ch->trans_skb;
363 __u16 block_len = *((__u16 *)skb->data);
364 int check_len;
365 int rc;
366
367 fsm_deltimer(&ch->timer);
368 if (len < 8) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
370 "%s(%s): got packet with length %d < 8\n",
371 CTCM_FUNTAIL, dev->name, len);
372 priv->stats.rx_dropped++;
373 priv->stats.rx_length_errors++;
374 goto again;
375 }
376 if (len > ch->max_bufsize) {
377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
378 "%s(%s): got packet with length %d > %d\n",
379 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
380 priv->stats.rx_dropped++;
381 priv->stats.rx_length_errors++;
382 goto again;
383 }
384
385 /*
386 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
387 */
388 switch (ch->protocol) {
389 case CTCM_PROTO_S390:
390 case CTCM_PROTO_OS390:
391 check_len = block_len + 2;
392 break;
393 default:
394 check_len = block_len;
395 break;
396 }
397 if ((len < block_len) || (len > check_len)) {
398 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
399 "%s(%s): got block length %d != rx length %d\n",
400 CTCM_FUNTAIL, dev->name, block_len, len);
401 if (do_debug)
402 ctcmpc_dump_skb(skb, 0);
403
404 *((__u16 *)skb->data) = len;
405 priv->stats.rx_dropped++;
406 priv->stats.rx_length_errors++;
407 goto again;
408 }
409 block_len -= 2;
410 if (block_len > 0) {
411 *((__u16 *)skb->data) = block_len;
412 ctcm_unpack_skb(ch, skb);
413 }
414 again:
415 skb->data = ch->trans_skb_data;
416 skb_reset_tail_pointer(skb);
417 skb->len = 0;
418 if (ctcm_checkalloc_buffer(ch))
419 return;
420 ch->ccw[1].count = ch->max_bufsize;
421 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
422 (unsigned long)ch, 0xff, 0);
423 if (rc != 0)
424 ctcm_ccw_check_rc(ch, rc, "normal RX");
425 }
426
427 /**
428 * Initialize connection by sending a __u16 of value 0.
429 *
430 * fi An instance of a channel statemachine.
431 * event The event, just happened.
432 * arg Generic pointer, casted from channel * upon call.
433 */
434 static void chx_firstio(fsm_instance *fi, int event, void *arg)
435 {
436 int rc;
437 struct channel *ch = arg;
438 int fsmstate = fsm_getstate(fi);
439
440 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
441 "%s(%s) : %02x",
442 CTCM_FUNTAIL, ch->id, fsmstate);
443
444 ch->sense_rc = 0; /* reset unit check report control */
445 if (fsmstate == CTC_STATE_TXIDLE)
446 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
447 "%s(%s): remote side issued READ?, init.\n",
448 CTCM_FUNTAIL, ch->id);
449 fsm_deltimer(&ch->timer);
450 if (ctcm_checkalloc_buffer(ch))
451 return;
452 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
453 (ch->protocol == CTCM_PROTO_OS390)) {
454 /* OS/390 resp. z/OS */
455 if (CHANNEL_DIRECTION(ch->flags) == READ) {
456 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
457 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
458 CTC_EVENT_TIMER, ch);
459 chx_rxidle(fi, event, arg);
460 } else {
461 struct net_device *dev = ch->netdev;
462 struct ctcm_priv *priv = dev->ml_priv;
463 fsm_newstate(fi, CTC_STATE_TXIDLE);
464 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
465 }
466 return;
467 }
468 /*
469 * Don't setup a timer for receiving the initial RX frame
470 * if in compatibility mode, since VM TCP delays the initial
471 * frame until it has some data to send.
472 */
473 if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
474 (ch->protocol != CTCM_PROTO_S390))
475 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
476
477 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
478 ch->ccw[1].count = 2; /* Transfer only length */
479
480 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
481 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
482 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
483 (unsigned long)ch, 0xff, 0);
484 if (rc != 0) {
485 fsm_deltimer(&ch->timer);
486 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
487 ctcm_ccw_check_rc(ch, rc, "init IO");
488 }
489 /*
490 * If in compatibility mode since we don't setup a timer, we
491 * also signal RX channel up immediately. This enables us
492 * to send packets early which in turn usually triggers some
493 * reply from VM TCP which brings up the RX channel to it's
494 * final state.
495 */
496 if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
497 (ch->protocol == CTCM_PROTO_S390)) {
498 struct net_device *dev = ch->netdev;
499 struct ctcm_priv *priv = dev->ml_priv;
500 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
501 }
502 }
503
504 /**
505 * Got initial data, check it. If OK,
506 * notify device statemachine that we are up and
507 * running.
508 *
509 * fi An instance of a channel statemachine.
510 * event The event, just happened.
511 * arg Generic pointer, casted from channel * upon call.
512 */
513 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
514 {
515 struct channel *ch = arg;
516 struct net_device *dev = ch->netdev;
517 struct ctcm_priv *priv = dev->ml_priv;
518 __u16 buflen;
519 int rc;
520
521 fsm_deltimer(&ch->timer);
522 buflen = *((__u16 *)ch->trans_skb->data);
523 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
524 __func__, dev->name, buflen);
525
526 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
527 if (ctcm_checkalloc_buffer(ch))
528 return;
529 ch->ccw[1].count = ch->max_bufsize;
530 fsm_newstate(fi, CTC_STATE_RXIDLE);
531 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
532 (unsigned long)ch, 0xff, 0);
533 if (rc != 0) {
534 fsm_newstate(fi, CTC_STATE_RXINIT);
535 ctcm_ccw_check_rc(ch, rc, "initial RX");
536 } else
537 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
538 } else {
539 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
540 __func__, dev->name,
541 buflen, CTCM_INITIAL_BLOCKLEN);
542 chx_firstio(fi, event, arg);
543 }
544 }
545
546 /**
547 * Set channel into extended mode.
548 *
549 * fi An instance of a channel statemachine.
550 * event The event, just happened.
551 * arg Generic pointer, casted from channel * upon call.
552 */
553 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
554 {
555 struct channel *ch = arg;
556 int rc;
557 unsigned long saveflags = 0;
558 int timeout = CTCM_TIME_5_SEC;
559
560 fsm_deltimer(&ch->timer);
561 if (IS_MPC(ch)) {
562 timeout = 1500;
563 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
564 __func__, smp_processor_id(), ch, ch->id);
565 }
566 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
567 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
568 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
569
570 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
572 /* Such conditional locking is undeterministic in
573 * static view. => ignore sparse warnings here. */
574
575 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
576 (unsigned long)ch, 0xff, 0);
577 if (event == CTC_EVENT_TIMER) /* see above comments */
578 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
579 if (rc != 0) {
580 fsm_deltimer(&ch->timer);
581 fsm_newstate(fi, CTC_STATE_STARTWAIT);
582 ctcm_ccw_check_rc(ch, rc, "set Mode");
583 } else
584 ch->retry = 0;
585 }
586
587 /**
588 * Setup channel.
589 *
590 * fi An instance of a channel statemachine.
591 * event The event, just happened.
592 * arg Generic pointer, casted from channel * upon call.
593 */
594 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
595 {
596 struct channel *ch = arg;
597 unsigned long saveflags;
598 int rc;
599
600 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
601 CTCM_FUNTAIL, ch->id,
602 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
603
604 if (ch->trans_skb != NULL) {
605 clear_normalized_cda(&ch->ccw[1]);
606 dev_kfree_skb(ch->trans_skb);
607 ch->trans_skb = NULL;
608 }
609 if (CHANNEL_DIRECTION(ch->flags) == READ) {
610 ch->ccw[1].cmd_code = CCW_CMD_READ;
611 ch->ccw[1].flags = CCW_FLAG_SLI;
612 ch->ccw[1].count = 0;
613 } else {
614 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
615 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
616 ch->ccw[1].count = 0;
617 }
618 if (ctcm_checkalloc_buffer(ch)) {
619 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
620 "%s(%s): %s trans_skb alloc delayed "
621 "until first transfer",
622 CTCM_FUNTAIL, ch->id,
623 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
624 }
625 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
626 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
627 ch->ccw[0].count = 0;
628 ch->ccw[0].cda = 0;
629 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
630 ch->ccw[2].flags = CCW_FLAG_SLI;
631 ch->ccw[2].count = 0;
632 ch->ccw[2].cda = 0;
633 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
634 ch->ccw[4].cda = 0;
635 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
636
637 fsm_newstate(fi, CTC_STATE_STARTWAIT);
638 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
639 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
640 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
641 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
642 if (rc != 0) {
643 if (rc != -EBUSY)
644 fsm_deltimer(&ch->timer);
645 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
646 }
647 }
648
649 /**
650 * Shutdown a channel.
651 *
652 * fi An instance of a channel statemachine.
653 * event The event, just happened.
654 * arg Generic pointer, casted from channel * upon call.
655 */
656 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
657 {
658 struct channel *ch = arg;
659 unsigned long saveflags = 0;
660 int rc;
661 int oldstate;
662
663 fsm_deltimer(&ch->timer);
664 if (IS_MPC(ch))
665 fsm_deltimer(&ch->sweep_timer);
666
667 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
668
669 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
670 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
671 /* Such conditional locking is undeterministic in
672 * static view. => ignore sparse warnings here. */
673 oldstate = fsm_getstate(fi);
674 fsm_newstate(fi, CTC_STATE_TERM);
675 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
676
677 if (event == CTC_EVENT_STOP)
678 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
679 /* see remark above about conditional locking */
680
681 if (rc != 0 && rc != -EBUSY) {
682 fsm_deltimer(&ch->timer);
683 if (event != CTC_EVENT_STOP) {
684 fsm_newstate(fi, oldstate);
685 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
686 }
687 }
688 }
689
690 /**
691 * Cleanup helper for chx_fail and chx_stopped
692 * cleanup channels queue and notify interface statemachine.
693 *
694 * fi An instance of a channel statemachine.
695 * state The next state (depending on caller).
696 * ch The channel to operate on.
697 */
698 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
699 struct channel *ch)
700 {
701 struct net_device *dev = ch->netdev;
702 struct ctcm_priv *priv = dev->ml_priv;
703
704 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
705 "%s(%s): %s[%d]\n",
706 CTCM_FUNTAIL, dev->name, ch->id, state);
707
708 fsm_deltimer(&ch->timer);
709 if (IS_MPC(ch))
710 fsm_deltimer(&ch->sweep_timer);
711
712 fsm_newstate(fi, state);
713 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
714 clear_normalized_cda(&ch->ccw[1]);
715 dev_kfree_skb_any(ch->trans_skb);
716 ch->trans_skb = NULL;
717 }
718
719 ch->th_seg = 0x00;
720 ch->th_seq_num = 0x00;
721 if (CHANNEL_DIRECTION(ch->flags) == READ) {
722 skb_queue_purge(&ch->io_queue);
723 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
724 } else {
725 ctcm_purge_skb_queue(&ch->io_queue);
726 if (IS_MPC(ch))
727 ctcm_purge_skb_queue(&ch->sweep_queue);
728 spin_lock(&ch->collect_lock);
729 ctcm_purge_skb_queue(&ch->collect_queue);
730 ch->collect_len = 0;
731 spin_unlock(&ch->collect_lock);
732 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
733 }
734 }
735
736 /**
737 * A channel has successfully been halted.
738 * Cleanup it's queue and notify interface statemachine.
739 *
740 * fi An instance of a channel statemachine.
741 * event The event, just happened.
742 * arg Generic pointer, casted from channel * upon call.
743 */
744 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
745 {
746 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
747 }
748
749 /**
750 * A stop command from device statemachine arrived and we are in
751 * not operational mode. Set state to stopped.
752 *
753 * fi An instance of a channel statemachine.
754 * event The event, just happened.
755 * arg Generic pointer, casted from channel * upon call.
756 */
757 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
758 {
759 fsm_newstate(fi, CTC_STATE_STOPPED);
760 }
761
762 /**
763 * A machine check for no path, not operational status or gone device has
764 * happened.
765 * Cleanup queue and notify interface statemachine.
766 *
767 * fi An instance of a channel statemachine.
768 * event The event, just happened.
769 * arg Generic pointer, casted from channel * upon call.
770 */
771 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
772 {
773 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
774 }
775
776 /**
777 * Handle error during setup of channel.
778 *
779 * fi An instance of a channel statemachine.
780 * event The event, just happened.
781 * arg Generic pointer, casted from channel * upon call.
782 */
783 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
784 {
785 struct channel *ch = arg;
786 struct net_device *dev = ch->netdev;
787 struct ctcm_priv *priv = dev->ml_priv;
788
789 /*
790 * Special case: Got UC_RCRESET on setmode.
791 * This means that remote side isn't setup. In this case
792 * simply retry after some 10 secs...
793 */
794 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
795 ((event == CTC_EVENT_UC_RCRESET) ||
796 (event == CTC_EVENT_UC_RSRESET))) {
797 fsm_newstate(fi, CTC_STATE_STARTRETRY);
798 fsm_deltimer(&ch->timer);
799 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
800 if (!IS_MPC(ch) && (CHANNEL_DIRECTION(ch->flags) == 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) == READ) ? "RX" : "TX",
813 fsm_getstate_str(fi));
814
815 if (CHANNEL_DIRECTION(ch->flags) == 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_pr_warn("%s: Error during RX init handshake\n", dev->name);
891 }
892
893 /**
894 * Notify device statemachine if we gave up initialization
895 * of RX channel.
896 *
897 * fi An instance of a channel statemachine.
898 * event The event, just happened.
899 * arg Generic pointer, casted from channel * upon call.
900 */
901 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
902 {
903 struct channel *ch = arg;
904 struct net_device *dev = ch->netdev;
905 struct ctcm_priv *priv = dev->ml_priv;
906
907 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
908 "%s(%s): RX %s busy, init. fail",
909 CTCM_FUNTAIL, dev->name, ch->id);
910 fsm_newstate(fi, CTC_STATE_RXERR);
911 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
912 }
913
914 /**
915 * Handle RX Unit check remote reset (remote disconnected)
916 *
917 * fi An instance of a channel statemachine.
918 * event The event, just happened.
919 * arg Generic pointer, casted from channel * upon call.
920 */
921 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
922 {
923 struct channel *ch = arg;
924 struct channel *ch2;
925 struct net_device *dev = ch->netdev;
926 struct ctcm_priv *priv = dev->ml_priv;
927
928 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
929 "%s: %s: remote disconnect - re-init ...",
930 CTCM_FUNTAIL, dev->name);
931 fsm_deltimer(&ch->timer);
932 /*
933 * Notify device statemachine
934 */
935 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
936 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
937
938 fsm_newstate(fi, CTC_STATE_DTERM);
939 ch2 = priv->channel[WRITE];
940 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
941
942 ccw_device_halt(ch->cdev, (unsigned long)ch);
943 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
944 }
945
946 /**
947 * Handle error during TX channel initialization.
948 *
949 * fi An instance of a channel statemachine.
950 * event The event, just happened.
951 * arg Generic pointer, casted from channel * upon call.
952 */
953 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
954 {
955 struct channel *ch = arg;
956 struct net_device *dev = ch->netdev;
957 struct ctcm_priv *priv = dev->ml_priv;
958
959 if (event == CTC_EVENT_TIMER) {
960 fsm_deltimer(&ch->timer);
961 if (ch->retry++ < 3)
962 ctcm_chx_restart(fi, event, arg);
963 else {
964 fsm_newstate(fi, CTC_STATE_TXERR);
965 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
966 }
967 } else {
968 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
969 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
970 ctc_ch_event_names[event], fsm_getstate_str(fi));
971
972 ctcm_pr_warn("%s: Error during TX init handshake\n", dev->name);
973 }
974 }
975
976 /**
977 * Handle TX timeout by retrying operation.
978 *
979 * fi An instance of a channel statemachine.
980 * event The event, just happened.
981 * arg Generic pointer, casted from channel * upon call.
982 */
983 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
984 {
985 struct channel *ch = arg;
986 struct net_device *dev = ch->netdev;
987 struct ctcm_priv *priv = dev->ml_priv;
988 struct sk_buff *skb;
989
990 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
991 __func__, smp_processor_id(), ch, ch->id);
992
993 fsm_deltimer(&ch->timer);
994 if (ch->retry++ > 3) {
995 struct mpc_group *gptr = priv->mpcg;
996 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
997 "%s: %s: retries exceeded",
998 CTCM_FUNTAIL, ch->id);
999 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1000 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1001 use gptr as mpc indicator */
1002 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1003 ctcm_chx_restart(fi, event, arg);
1004 goto done;
1005 }
1006
1007 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1008 "%s : %s: retry %d",
1009 CTCM_FUNTAIL, ch->id, ch->retry);
1010 skb = skb_peek(&ch->io_queue);
1011 if (skb) {
1012 int rc = 0;
1013 unsigned long saveflags = 0;
1014 clear_normalized_cda(&ch->ccw[4]);
1015 ch->ccw[4].count = skb->len;
1016 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1017 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1018 "%s: %s: IDAL alloc failed",
1019 CTCM_FUNTAIL, ch->id);
1020 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1021 ctcm_chx_restart(fi, event, arg);
1022 goto done;
1023 }
1024 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1025 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1026 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1027 /* Such conditional locking is a known problem for
1028 * sparse because its undeterministic in static view.
1029 * Warnings should be ignored here. */
1030 if (do_debug_ccw)
1031 ctcmpc_dumpit((char *)&ch->ccw[3],
1032 sizeof(struct ccw1) * 3);
1033
1034 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1035 (unsigned long)ch, 0xff, 0);
1036 if (event == CTC_EVENT_TIMER)
1037 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1038 saveflags);
1039 if (rc != 0) {
1040 fsm_deltimer(&ch->timer);
1041 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1042 ctcm_purge_skb_queue(&ch->io_queue);
1043 }
1044 }
1045 done:
1046 return;
1047 }
1048
1049 /**
1050 * Handle fatal errors during an I/O command.
1051 *
1052 * fi An instance of a channel statemachine.
1053 * event The event, just happened.
1054 * arg Generic pointer, casted from channel * upon call.
1055 */
1056 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1057 {
1058 struct channel *ch = arg;
1059 struct net_device *dev = ch->netdev;
1060 struct ctcm_priv *priv = dev->ml_priv;
1061 int rd = CHANNEL_DIRECTION(ch->flags);
1062
1063 fsm_deltimer(&ch->timer);
1064 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1065 "%s: %s: %s unrecoverable channel error",
1066 CTCM_FUNTAIL, ch->id, rd == READ ? "RX" : "TX");
1067
1068 if (IS_MPC(ch)) {
1069 priv->stats.tx_dropped++;
1070 priv->stats.tx_errors++;
1071 }
1072 if (rd == READ) {
1073 fsm_newstate(fi, CTC_STATE_RXERR);
1074 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1075 } else {
1076 fsm_newstate(fi, CTC_STATE_TXERR);
1077 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1078 }
1079 }
1080
1081 /*
1082 * The ctcm statemachine for a channel.
1083 */
1084 const fsm_node ch_fsm[] = {
1085 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1086 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1087 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1088 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1089
1090 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1091 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1092 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1093 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1094 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1095
1096 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1097 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1098 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1099 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1100 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1101 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1102
1103 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1104 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1105 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1106 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1107
1108 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1109 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1110 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1111 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1112 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1113 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1114 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1115 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1116
1117 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1118 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1119 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1120 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1121 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1122 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1123 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1124 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1125 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1126 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1127
1128 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1129 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1130 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1131 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1132 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1133 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1134 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1135
1136 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1137 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1138 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1139 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1140 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1141 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1142 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1143 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1144
1145 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1146 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1147 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1148 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1149 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1150 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1151 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1152
1153 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1154 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1155 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1156 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1157 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1158 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1159
1160 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1161 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1162 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1163 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1164 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1165 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1166
1167 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1168 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1169 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1170 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1171 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1172 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1173 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1174 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1175
1176 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1177 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1178 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1179 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1180 };
1181
1182 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1183
1184 /*
1185 * MPC actions for mpc channel statemachine
1186 * handling of MPC protocol requires extra
1187 * statemachine and actions which are prefixed ctcmpc_ .
1188 * The ctc_ch_states and ctc_ch_state_names,
1189 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1190 * which are expanded by some elements.
1191 */
1192
1193 /*
1194 * Actions for mpc channel statemachine.
1195 */
1196
1197 /**
1198 * Normal data has been send. Free the corresponding
1199 * skb (it's in io_queue), reset dev->tbusy and
1200 * revert to idle state.
1201 *
1202 * fi An instance of a channel statemachine.
1203 * event The event, just happened.
1204 * arg Generic pointer, casted from channel * upon call.
1205 */
1206 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1207 {
1208 struct channel *ch = arg;
1209 struct net_device *dev = ch->netdev;
1210 struct ctcm_priv *priv = dev->ml_priv;
1211 struct mpc_group *grp = priv->mpcg;
1212 struct sk_buff *skb;
1213 int first = 1;
1214 int i;
1215 __u32 data_space;
1216 unsigned long duration;
1217 struct sk_buff *peekskb;
1218 int rc;
1219 struct th_header *header;
1220 struct pdu *p_header;
1221 struct timespec done_stamp = current_kernel_time(); /* xtime */
1222
1223 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1224 __func__, dev->name, smp_processor_id());
1225
1226 duration =
1227 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1228 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1229 if (duration > ch->prof.tx_time)
1230 ch->prof.tx_time = duration;
1231
1232 if (ch->irb->scsw.cmd.count != 0)
1233 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1234 "%s(%s): TX not complete, remaining %d bytes",
1235 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1236 fsm_deltimer(&ch->timer);
1237 while ((skb = skb_dequeue(&ch->io_queue))) {
1238 priv->stats.tx_packets++;
1239 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1240 if (first) {
1241 priv->stats.tx_bytes += 2;
1242 first = 0;
1243 }
1244 atomic_dec(&skb->users);
1245 dev_kfree_skb_irq(skb);
1246 }
1247 spin_lock(&ch->collect_lock);
1248 clear_normalized_cda(&ch->ccw[4]);
1249 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1250 spin_unlock(&ch->collect_lock);
1251 fsm_newstate(fi, CTC_STATE_TXIDLE);
1252 goto done;
1253 }
1254
1255 if (ctcm_checkalloc_buffer(ch)) {
1256 spin_unlock(&ch->collect_lock);
1257 goto done;
1258 }
1259 ch->trans_skb->data = ch->trans_skb_data;
1260 skb_reset_tail_pointer(ch->trans_skb);
1261 ch->trans_skb->len = 0;
1262 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1263 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1264 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1265 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1266 i = 0;
1267 p_header = NULL;
1268 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1269
1270 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1271 " data_space:%04x\n",
1272 __func__, data_space);
1273
1274 while ((skb = skb_dequeue(&ch->collect_queue))) {
1275 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1276 p_header = (struct pdu *)
1277 (skb_tail_pointer(ch->trans_skb) - skb->len);
1278 p_header->pdu_flag = 0x00;
1279 if (skb->protocol == ntohs(ETH_P_SNAP))
1280 p_header->pdu_flag |= 0x60;
1281 else
1282 p_header->pdu_flag |= 0x20;
1283
1284 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1285 __func__, ch->trans_skb->len);
1286 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1287 " to 32 bytes sent to vtam\n", __func__);
1288 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1289
1290 ch->collect_len -= skb->len;
1291 data_space -= skb->len;
1292 priv->stats.tx_packets++;
1293 priv->stats.tx_bytes += skb->len;
1294 atomic_dec(&skb->users);
1295 dev_kfree_skb_any(skb);
1296 peekskb = skb_peek(&ch->collect_queue);
1297 if (peekskb->len > data_space)
1298 break;
1299 i++;
1300 }
1301 /* p_header points to the last one we handled */
1302 if (p_header)
1303 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1304 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1305 if (!header) {
1306 spin_unlock(&ch->collect_lock);
1307 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1308 goto done;
1309 }
1310 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1311 ch->th_seq_num++;
1312 header->th_seq_num = ch->th_seq_num;
1313
1314 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1315 __func__, ch->th_seq_num);
1316
1317 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1318 TH_HEADER_LENGTH); /* put the TH on the packet */
1319
1320 kfree(header);
1321
1322 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1323 __func__, ch->trans_skb->len);
1324 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1325 "data to vtam from collect_q\n", __func__);
1326 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1327 min_t(int, ch->trans_skb->len, 50));
1328
1329 spin_unlock(&ch->collect_lock);
1330 clear_normalized_cda(&ch->ccw[1]);
1331 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1332 dev_kfree_skb_any(ch->trans_skb);
1333 ch->trans_skb = NULL;
1334 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1335 "%s: %s: IDAL alloc failed",
1336 CTCM_FUNTAIL, ch->id);
1337 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1338 return;
1339 }
1340 ch->ccw[1].count = ch->trans_skb->len;
1341 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1342 ch->prof.send_stamp = current_kernel_time(); /* xtime */
1343 if (do_debug_ccw)
1344 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1345 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1346 (unsigned long)ch, 0xff, 0);
1347 ch->prof.doios_multi++;
1348 if (rc != 0) {
1349 priv->stats.tx_dropped += i;
1350 priv->stats.tx_errors += i;
1351 fsm_deltimer(&ch->timer);
1352 ctcm_ccw_check_rc(ch, rc, "chained TX");
1353 }
1354 done:
1355 ctcm_clear_busy(dev);
1356 return;
1357 }
1358
1359 /**
1360 * Got normal data, check for sanity, queue it up, allocate new buffer
1361 * trigger bottom half, and initiate next read.
1362 *
1363 * fi An instance of a channel statemachine.
1364 * event The event, just happened.
1365 * arg Generic pointer, casted from channel * upon call.
1366 */
1367 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1368 {
1369 struct channel *ch = arg;
1370 struct net_device *dev = ch->netdev;
1371 struct ctcm_priv *priv = dev->ml_priv;
1372 struct mpc_group *grp = priv->mpcg;
1373 struct sk_buff *skb = ch->trans_skb;
1374 struct sk_buff *new_skb;
1375 unsigned long saveflags = 0; /* avoids compiler warning */
1376 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1377
1378 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1379 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1380 ch->id, ch->max_bufsize, len);
1381 fsm_deltimer(&ch->timer);
1382
1383 if (skb == NULL) {
1384 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1385 "%s(%s): TRANS_SKB = NULL",
1386 CTCM_FUNTAIL, dev->name);
1387 goto again;
1388 }
1389
1390 if (len < TH_HEADER_LENGTH) {
1391 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1392 "%s(%s): packet length %d to short",
1393 CTCM_FUNTAIL, dev->name, len);
1394 priv->stats.rx_dropped++;
1395 priv->stats.rx_length_errors++;
1396 } else {
1397 /* must have valid th header or game over */
1398 __u32 block_len = len;
1399 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1400 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1401
1402 if (new_skb == NULL) {
1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1404 "%s(%d): skb allocation failed",
1405 CTCM_FUNTAIL, dev->name);
1406 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1407 goto again;
1408 }
1409 switch (fsm_getstate(grp->fsm)) {
1410 case MPCG_STATE_RESET:
1411 case MPCG_STATE_INOP:
1412 dev_kfree_skb_any(new_skb);
1413 break;
1414 case MPCG_STATE_FLOWC:
1415 case MPCG_STATE_READY:
1416 memcpy(skb_put(new_skb, block_len),
1417 skb->data, block_len);
1418 skb_queue_tail(&ch->io_queue, new_skb);
1419 tasklet_schedule(&ch->ch_tasklet);
1420 break;
1421 default:
1422 memcpy(skb_put(new_skb, len), skb->data, len);
1423 skb_queue_tail(&ch->io_queue, new_skb);
1424 tasklet_hi_schedule(&ch->ch_tasklet);
1425 break;
1426 }
1427 }
1428
1429 again:
1430 switch (fsm_getstate(grp->fsm)) {
1431 int rc, dolock;
1432 case MPCG_STATE_FLOWC:
1433 case MPCG_STATE_READY:
1434 if (ctcm_checkalloc_buffer(ch))
1435 break;
1436 ch->trans_skb->data = ch->trans_skb_data;
1437 skb_reset_tail_pointer(ch->trans_skb);
1438 ch->trans_skb->len = 0;
1439 ch->ccw[1].count = ch->max_bufsize;
1440 if (do_debug_ccw)
1441 ctcmpc_dumpit((char *)&ch->ccw[0],
1442 sizeof(struct ccw1) * 3);
1443 dolock = !in_irq();
1444 if (dolock)
1445 spin_lock_irqsave(
1446 get_ccwdev_lock(ch->cdev), saveflags);
1447 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1448 (unsigned long)ch, 0xff, 0);
1449 if (dolock) /* see remark about conditional locking */
1450 spin_unlock_irqrestore(
1451 get_ccwdev_lock(ch->cdev), saveflags);
1452 if (rc != 0)
1453 ctcm_ccw_check_rc(ch, rc, "normal RX");
1454 default:
1455 break;
1456 }
1457
1458 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1459 __func__, dev->name, ch, ch->id);
1460
1461 }
1462
1463 /**
1464 * Initialize connection by sending a __u16 of value 0.
1465 *
1466 * fi An instance of a channel statemachine.
1467 * event The event, just happened.
1468 * arg Generic pointer, casted from channel * upon call.
1469 */
1470 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1471 {
1472 struct channel *ch = arg;
1473 struct net_device *dev = ch->netdev;
1474 struct ctcm_priv *priv = dev->ml_priv;
1475 struct mpc_group *gptr = priv->mpcg;
1476
1477 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1478 __func__, ch->id, ch);
1479
1480 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1481 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1482 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1483 fsm_getstate(gptr->fsm), ch->protocol);
1484
1485 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1486 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1487
1488 fsm_deltimer(&ch->timer);
1489 if (ctcm_checkalloc_buffer(ch))
1490 goto done;
1491
1492 switch (fsm_getstate(fi)) {
1493 case CTC_STATE_STARTRETRY:
1494 case CTC_STATE_SETUPWAIT:
1495 if (CHANNEL_DIRECTION(ch->flags) == READ) {
1496 ctcmpc_chx_rxidle(fi, event, arg);
1497 } else {
1498 fsm_newstate(fi, CTC_STATE_TXIDLE);
1499 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1500 }
1501 goto done;
1502 default:
1503 break;
1504 };
1505
1506 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
1507 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1508
1509 done:
1510 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1511 __func__, ch->id, ch);
1512 return;
1513 }
1514
1515 /**
1516 * Got initial data, check it. If OK,
1517 * notify device statemachine that we are up and
1518 * running.
1519 *
1520 * fi An instance of a channel statemachine.
1521 * event The event, just happened.
1522 * arg Generic pointer, casted from channel * upon call.
1523 */
1524 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1525 {
1526 struct channel *ch = arg;
1527 struct net_device *dev = ch->netdev;
1528 struct ctcm_priv *priv = dev->ml_priv;
1529 struct mpc_group *grp = priv->mpcg;
1530 int rc;
1531 unsigned long saveflags = 0; /* avoids compiler warning */
1532
1533 fsm_deltimer(&ch->timer);
1534 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1535 __func__, ch->id, dev->name, smp_processor_id(),
1536 fsm_getstate(fi), fsm_getstate(grp->fsm));
1537
1538 fsm_newstate(fi, CTC_STATE_RXIDLE);
1539 /* XID processing complete */
1540
1541 switch (fsm_getstate(grp->fsm)) {
1542 case MPCG_STATE_FLOWC:
1543 case MPCG_STATE_READY:
1544 if (ctcm_checkalloc_buffer(ch))
1545 goto done;
1546 ch->trans_skb->data = ch->trans_skb_data;
1547 skb_reset_tail_pointer(ch->trans_skb);
1548 ch->trans_skb->len = 0;
1549 ch->ccw[1].count = ch->max_bufsize;
1550 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1551 if (event == CTC_EVENT_START)
1552 /* see remark about conditional locking */
1553 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1554 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1555 (unsigned long)ch, 0xff, 0);
1556 if (event == CTC_EVENT_START)
1557 spin_unlock_irqrestore(
1558 get_ccwdev_lock(ch->cdev), saveflags);
1559 if (rc != 0) {
1560 fsm_newstate(fi, CTC_STATE_RXINIT);
1561 ctcm_ccw_check_rc(ch, rc, "initial RX");
1562 goto done;
1563 }
1564 break;
1565 default:
1566 break;
1567 }
1568
1569 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1570 done:
1571 return;
1572 }
1573
1574 /*
1575 * ctcmpc channel FSM action
1576 * called from several points in ctcmpc_ch_fsm
1577 * ctcmpc only
1578 */
1579 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1580 {
1581 struct channel *ch = arg;
1582 struct net_device *dev = ch->netdev;
1583 struct ctcm_priv *priv = dev->ml_priv;
1584 struct mpc_group *grp = priv->mpcg;
1585
1586 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1587 __func__, dev->name, ch->id, ch, smp_processor_id(),
1588 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1589
1590 switch (fsm_getstate(grp->fsm)) {
1591 case MPCG_STATE_XID2INITW:
1592 /* ok..start yside xid exchanges */
1593 if (!ch->in_mpcgroup)
1594 break;
1595 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1596 fsm_deltimer(&grp->timer);
1597 fsm_addtimer(&grp->timer,
1598 MPC_XID_TIMEOUT_VALUE,
1599 MPCG_EVENT_TIMER, dev);
1600 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1601
1602 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1603 /* attn rcvd before xid0 processed via bh */
1604 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1605 break;
1606 case MPCG_STATE_XID2INITX:
1607 case MPCG_STATE_XID0IOWAIT:
1608 case MPCG_STATE_XID0IOWAIX:
1609 /* attn rcvd before xid0 processed on ch
1610 but mid-xid0 processing for group */
1611 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1612 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1613 break;
1614 case MPCG_STATE_XID7INITW:
1615 case MPCG_STATE_XID7INITX:
1616 case MPCG_STATE_XID7INITI:
1617 case MPCG_STATE_XID7INITZ:
1618 switch (fsm_getstate(ch->fsm)) {
1619 case CH_XID7_PENDING:
1620 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1621 break;
1622 case CH_XID7_PENDING2:
1623 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1624 break;
1625 }
1626 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1627 break;
1628 }
1629
1630 return;
1631 }
1632
1633 /*
1634 * ctcmpc channel FSM action
1635 * called from one point in ctcmpc_ch_fsm
1636 * ctcmpc only
1637 */
1638 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1639 {
1640 struct channel *ch = arg;
1641 struct net_device *dev = ch->netdev;
1642 struct ctcm_priv *priv = dev->ml_priv;
1643 struct mpc_group *grp = priv->mpcg;
1644
1645 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1646 __func__, dev->name, ch->id,
1647 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1648
1649 fsm_deltimer(&ch->timer);
1650
1651 switch (fsm_getstate(grp->fsm)) {
1652 case MPCG_STATE_XID0IOWAIT:
1653 /* vtam wants to be primary.start yside xid exchanges*/
1654 /* only receive one attn-busy at a time so must not */
1655 /* change state each time */
1656 grp->changed_side = 1;
1657 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1658 break;
1659 case MPCG_STATE_XID2INITW:
1660 if (grp->changed_side == 1) {
1661 grp->changed_side = 2;
1662 break;
1663 }
1664 /* process began via call to establish_conn */
1665 /* so must report failure instead of reverting */
1666 /* back to ready-for-xid passive state */
1667 if (grp->estconnfunc)
1668 goto done;
1669 /* this attnbusy is NOT the result of xside xid */
1670 /* collisions so yside must have been triggered */
1671 /* by an ATTN that was not intended to start XID */
1672 /* processing. Revert back to ready-for-xid and */
1673 /* wait for ATTN interrupt to signal xid start */
1674 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1675 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1676 fsm_deltimer(&grp->timer);
1677 goto done;
1678 }
1679 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1680 goto done;
1681 case MPCG_STATE_XID2INITX:
1682 /* XID2 was received before ATTN Busy for second
1683 channel.Send yside xid for second channel.
1684 */
1685 if (grp->changed_side == 1) {
1686 grp->changed_side = 2;
1687 break;
1688 }
1689 case MPCG_STATE_XID0IOWAIX:
1690 case MPCG_STATE_XID7INITW:
1691 case MPCG_STATE_XID7INITX:
1692 case MPCG_STATE_XID7INITI:
1693 case MPCG_STATE_XID7INITZ:
1694 default:
1695 /* multiple attn-busy indicates too out-of-sync */
1696 /* and they are certainly not being received as part */
1697 /* of valid mpc group negotiations.. */
1698 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1699 goto done;
1700 }
1701
1702 if (grp->changed_side == 1) {
1703 fsm_deltimer(&grp->timer);
1704 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1705 MPCG_EVENT_TIMER, dev);
1706 }
1707 if (ch->in_mpcgroup)
1708 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1709 else
1710 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1711 "%s(%s): channel %s not added to group",
1712 CTCM_FUNTAIL, dev->name, ch->id);
1713
1714 done:
1715 return;
1716 }
1717
1718 /*
1719 * ctcmpc channel FSM action
1720 * called from several points in ctcmpc_ch_fsm
1721 * ctcmpc only
1722 */
1723 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1724 {
1725 struct channel *ch = arg;
1726 struct net_device *dev = ch->netdev;
1727 struct ctcm_priv *priv = dev->ml_priv;
1728 struct mpc_group *grp = priv->mpcg;
1729
1730 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1731 return;
1732 }
1733
1734 /*
1735 * ctcmpc channel FSM action
1736 * called from several points in ctcmpc_ch_fsm
1737 * ctcmpc only
1738 */
1739 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1740 {
1741 struct channel *ach = arg;
1742 struct net_device *dev = ach->netdev;
1743 struct ctcm_priv *priv = dev->ml_priv;
1744 struct mpc_group *grp = priv->mpcg;
1745 struct channel *wch = priv->channel[WRITE];
1746 struct channel *rch = priv->channel[READ];
1747 struct sk_buff *skb;
1748 struct th_sweep *header;
1749 int rc = 0;
1750 unsigned long saveflags = 0;
1751
1752 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1753 __func__, smp_processor_id(), ach, ach->id);
1754
1755 if (grp->in_sweep == 0)
1756 goto done;
1757
1758 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1759 __func__, wch->th_seq_num);
1760 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1761 __func__, rch->th_seq_num);
1762
1763 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1764 /* give the previous IO time to complete */
1765 fsm_addtimer(&wch->sweep_timer,
1766 200, CTC_EVENT_RSWEEP_TIMER, wch);
1767 goto done;
1768 }
1769
1770 skb = skb_dequeue(&wch->sweep_queue);
1771 if (!skb)
1772 goto done;
1773
1774 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1775 grp->in_sweep = 0;
1776 ctcm_clear_busy_do(dev);
1777 dev_kfree_skb_any(skb);
1778 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1779 goto done;
1780 } else {
1781 atomic_inc(&skb->users);
1782 skb_queue_tail(&wch->io_queue, skb);
1783 }
1784
1785 /* send out the sweep */
1786 wch->ccw[4].count = skb->len;
1787
1788 header = (struct th_sweep *)skb->data;
1789 switch (header->th.th_ch_flag) {
1790 case TH_SWEEP_REQ:
1791 grp->sweep_req_pend_num--;
1792 break;
1793 case TH_SWEEP_RESP:
1794 grp->sweep_rsp_pend_num--;
1795 break;
1796 }
1797
1798 header->sw.th_last_seq = wch->th_seq_num;
1799
1800 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1801 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1802 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1803
1804 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1805 fsm_newstate(wch->fsm, CTC_STATE_TX);
1806
1807 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1808 wch->prof.send_stamp = current_kernel_time(); /* xtime */
1809 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1810 (unsigned long) wch, 0xff, 0);
1811 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1812
1813 if ((grp->sweep_req_pend_num == 0) &&
1814 (grp->sweep_rsp_pend_num == 0)) {
1815 grp->in_sweep = 0;
1816 rch->th_seq_num = 0x00;
1817 wch->th_seq_num = 0x00;
1818 ctcm_clear_busy_do(dev);
1819 }
1820
1821 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1822 __func__, wch->th_seq_num, rch->th_seq_num);
1823
1824 if (rc != 0)
1825 ctcm_ccw_check_rc(wch, rc, "send sweep");
1826
1827 done:
1828 return;
1829 }
1830
1831
1832 /*
1833 * The ctcmpc statemachine for a channel.
1834 */
1835
1836 const fsm_node ctcmpc_ch_fsm[] = {
1837 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1838 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1839 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1840 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1841 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1842
1843 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1844 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1845 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1846 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1847 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1848 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1849 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1850 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1851
1852 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1853 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1854 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1855 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1856 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1857 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1858
1859 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1860 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1861 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1862 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1863 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1864
1865 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1866 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1867 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1868 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1869 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1870 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1871 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1872 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1873
1874 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1875 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1876 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1877 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1878 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1879 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1880 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1881 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1882 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1883 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1884
1885 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1886 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1887 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1888 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1889 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1890 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1891 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1892 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1893 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1894 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1895
1896 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1897 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1898 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1899 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1900 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1901 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1902 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1903 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1904 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1905 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1906 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1907
1908 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1909 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1910 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1911 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1912 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1913 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1914 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1915 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1916 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1917 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1918 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1919 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1920 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1921
1922 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1923 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1924 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1925 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1926 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1927 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1928 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1929 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1930 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1931 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1932 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1933 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1934
1935 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1936 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1937 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1938 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1939 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1940 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1941 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1942 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1943 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1944 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1945 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1946 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1947
1948 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1949 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1950 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1951 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1952 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1953 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1954 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1955 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1956 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1957 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1958 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1959 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1960
1961 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1962 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1963 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1964 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1965 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1966 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1967 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1968 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1969 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1970 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1971 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1972 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1973
1974 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1975 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1976 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1977 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1978 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1979 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1980 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1981 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1982
1983 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1984 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1985 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1986 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1987 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1988 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1989 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1990 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1991 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
1992
1993 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1994 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1995 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1996 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
1997 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1998 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1999 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2000 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2001
2002 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2003 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2004 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2005 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2006 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2007 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2008 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2009 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2010
2011 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2012 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2013 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2014 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2015 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2016 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2017 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2018
2019 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2020 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2021 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2022 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2023 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2024 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2025 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2026 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2027 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2028 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2029
2030 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2031 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2032 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2033 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2034 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2035 };
2036
2037 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2038
2039 /*
2040 * Actions for interface - statemachine.
2041 */
2042
2043 /**
2044 * Startup channels by sending CTC_EVENT_START to each channel.
2045 *
2046 * fi An instance of an interface statemachine.
2047 * event The event, just happened.
2048 * arg Generic pointer, casted from struct net_device * upon call.
2049 */
2050 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2051 {
2052 struct net_device *dev = arg;
2053 struct ctcm_priv *priv = dev->ml_priv;
2054 int direction;
2055
2056 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2057
2058 fsm_deltimer(&priv->restart_timer);
2059 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2060 if (IS_MPC(priv))
2061 priv->mpcg->channels_terminating = 0;
2062 for (direction = READ; direction <= WRITE; direction++) {
2063 struct channel *ch = priv->channel[direction];
2064 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2065 }
2066 }
2067
2068 /**
2069 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2070 *
2071 * fi An instance of an interface statemachine.
2072 * event The event, just happened.
2073 * arg Generic pointer, casted from struct net_device * upon call.
2074 */
2075 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2076 {
2077 int direction;
2078 struct net_device *dev = arg;
2079 struct ctcm_priv *priv = dev->ml_priv;
2080
2081 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2082
2083 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2084 for (direction = READ; direction <= WRITE; direction++) {
2085 struct channel *ch = priv->channel[direction];
2086 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2087 ch->th_seq_num = 0x00;
2088 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2089 __func__, ch->th_seq_num);
2090 }
2091 if (IS_MPC(priv))
2092 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2093 }
2094
2095 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2096 {
2097 int restart_timer;
2098 struct net_device *dev = arg;
2099 struct ctcm_priv *priv = dev->ml_priv;
2100
2101 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2102
2103 if (IS_MPC(priv)) {
2104 ctcm_pr_info("ctcm: %s Restarting Device and "
2105 "MPC Group in 5 seconds\n",
2106 dev->name);
2107 restart_timer = CTCM_TIME_1_SEC;
2108 } else {
2109 ctcm_pr_info("%s: Restarting\n", dev->name);
2110 restart_timer = CTCM_TIME_5_SEC;
2111 }
2112
2113 dev_action_stop(fi, event, arg);
2114 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2115 if (IS_MPC(priv))
2116 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2117
2118 /* going back into start sequence too quickly can */
2119 /* result in the other side becoming unreachable due */
2120 /* to sense reported when IO is aborted */
2121 fsm_addtimer(&priv->restart_timer, restart_timer,
2122 DEV_EVENT_START, dev);
2123 }
2124
2125 /**
2126 * Called from channel statemachine
2127 * when a channel is up and running.
2128 *
2129 * fi An instance of an interface statemachine.
2130 * event The event, just happened.
2131 * arg Generic pointer, casted from struct net_device * upon call.
2132 */
2133 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2134 {
2135 struct net_device *dev = arg;
2136 struct ctcm_priv *priv = dev->ml_priv;
2137 int dev_stat = fsm_getstate(fi);
2138
2139 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2140 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2141 dev->name, dev->ml_priv, dev_stat, event);
2142
2143 switch (fsm_getstate(fi)) {
2144 case DEV_STATE_STARTWAIT_RXTX:
2145 if (event == DEV_EVENT_RXUP)
2146 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2147 else
2148 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2149 break;
2150 case DEV_STATE_STARTWAIT_RX:
2151 if (event == DEV_EVENT_RXUP) {
2152 fsm_newstate(fi, DEV_STATE_RUNNING);
2153 ctcm_pr_info("%s: connected with remote side\n",
2154 dev->name);
2155 ctcm_clear_busy(dev);
2156 }
2157 break;
2158 case DEV_STATE_STARTWAIT_TX:
2159 if (event == DEV_EVENT_TXUP) {
2160 fsm_newstate(fi, DEV_STATE_RUNNING);
2161 ctcm_pr_info("%s: connected with remote side\n",
2162 dev->name);
2163 ctcm_clear_busy(dev);
2164 }
2165 break;
2166 case DEV_STATE_STOPWAIT_TX:
2167 if (event == DEV_EVENT_RXUP)
2168 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2169 break;
2170 case DEV_STATE_STOPWAIT_RX:
2171 if (event == DEV_EVENT_TXUP)
2172 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2173 break;
2174 }
2175
2176 if (IS_MPC(priv)) {
2177 if (event == DEV_EVENT_RXUP)
2178 mpc_channel_action(priv->channel[READ],
2179 READ, MPC_CHANNEL_ADD);
2180 else
2181 mpc_channel_action(priv->channel[WRITE],
2182 WRITE, MPC_CHANNEL_ADD);
2183 }
2184 }
2185
2186 /**
2187 * Called from device statemachine
2188 * when a channel has been shutdown.
2189 *
2190 * fi An instance of an interface statemachine.
2191 * event The event, just happened.
2192 * arg Generic pointer, casted from struct net_device * upon call.
2193 */
2194 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2195 {
2196
2197 struct net_device *dev = arg;
2198 struct ctcm_priv *priv = dev->ml_priv;
2199
2200 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2201
2202 switch (fsm_getstate(fi)) {
2203 case DEV_STATE_RUNNING:
2204 if (event == DEV_EVENT_TXDOWN)
2205 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2206 else
2207 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2208 break;
2209 case DEV_STATE_STARTWAIT_RX:
2210 if (event == DEV_EVENT_TXDOWN)
2211 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2212 break;
2213 case DEV_STATE_STARTWAIT_TX:
2214 if (event == DEV_EVENT_RXDOWN)
2215 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2216 break;
2217 case DEV_STATE_STOPWAIT_RXTX:
2218 if (event == DEV_EVENT_TXDOWN)
2219 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2220 else
2221 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2222 break;
2223 case DEV_STATE_STOPWAIT_RX:
2224 if (event == DEV_EVENT_RXDOWN)
2225 fsm_newstate(fi, DEV_STATE_STOPPED);
2226 break;
2227 case DEV_STATE_STOPWAIT_TX:
2228 if (event == DEV_EVENT_TXDOWN)
2229 fsm_newstate(fi, DEV_STATE_STOPPED);
2230 break;
2231 }
2232 if (IS_MPC(priv)) {
2233 if (event == DEV_EVENT_RXDOWN)
2234 mpc_channel_action(priv->channel[READ],
2235 READ, MPC_CHANNEL_REMOVE);
2236 else
2237 mpc_channel_action(priv->channel[WRITE],
2238 WRITE, MPC_CHANNEL_REMOVE);
2239 }
2240 }
2241
2242 const fsm_node dev_fsm[] = {
2243 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2244 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2245 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2246 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2247 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2248 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2249 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2250 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2251 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2252 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2253 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2254 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2255 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2256 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2257 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2258 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2259 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2260 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2261 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2262 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2263 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2264 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2265 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2266 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2267 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2268 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2269 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2270 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2271 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2272 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2273 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2274 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2275 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2276 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2277 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2278 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2279 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2280 };
2281
2282 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2283
2284 /* --- This is the END my friend --- */
2285
Support for the Chinese Samsung S3C2440 based development boards