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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / s390 / net / ctcm_fsms.c
blob3ce99e4db44d5fd573a9500f991d1947a3fe1551
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2001, 2007
4 * Authors: Fritz Elfert (felfert@millenux.com)
5 * Peter Tiedemann (ptiedem@de.ibm.com)
6 * MPC additions :
7 * Belinda Thompson (belindat@us.ibm.com)
8 * Andy Richter (richtera@us.ibm.com)
9 */
10
11 #undef DEBUG
12 #undef DEBUGDATA
13 #undef DEBUGCCW
14
15 #define KMSG_COMPONENT "ctcm"
16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18 #include <linux/module.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/slab.h>
22 #include <linux/errno.h>
23 #include <linux/types.h>
24 #include <linux/interrupt.h>
25 #include <linux/timer.h>
26 #include <linux/bitops.h>
27
28 #include <linux/signal.h>
29 #include <linux/string.h>
30
31 #include <linux/ip.h>
32 #include <linux/if_arp.h>
33 #include <linux/tcp.h>
34 #include <linux/skbuff.h>
35 #include <linux/ctype.h>
36 #include <net/dst.h>
37
38 #include <linux/io.h>
39 #include <asm/ccwdev.h>
40 #include <asm/ccwgroup.h>
41 #include <linux/uaccess.h>
42
43 #include <asm/idals.h>
44
45 #include "fsm.h"
46
47 #include "ctcm_dbug.h"
48 #include "ctcm_main.h"
49 #include "ctcm_fsms.h"
50
51 const char *dev_state_names[] = {
52 [DEV_STATE_STOPPED] = "Stopped",
53 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
54 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
55 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
56 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
57 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
58 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
59 [DEV_STATE_RUNNING] = "Running",
60 };
61
62 const char *dev_event_names[] = {
63 [DEV_EVENT_START] = "Start",
64 [DEV_EVENT_STOP] = "Stop",
65 [DEV_EVENT_RXUP] = "RX up",
66 [DEV_EVENT_TXUP] = "TX up",
67 [DEV_EVENT_RXDOWN] = "RX down",
68 [DEV_EVENT_TXDOWN] = "TX down",
69 [DEV_EVENT_RESTART] = "Restart",
70 };
71
72 const char *ctc_ch_event_names[] = {
73 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
74 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
75 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
76 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
77 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
78 [CTC_EVENT_ATTN] = "Status ATTN",
79 [CTC_EVENT_BUSY] = "Status BUSY",
80 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
81 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
82 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
83 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
84 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
85 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
86 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
87 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
88 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
89 [CTC_EVENT_MC_FAIL] = "Machine check failure",
90 [CTC_EVENT_MC_GOOD] = "Machine check operational",
91 [CTC_EVENT_IRQ] = "IRQ normal",
92 [CTC_EVENT_FINSTAT] = "IRQ final",
93 [CTC_EVENT_TIMER] = "Timer",
94 [CTC_EVENT_START] = "Start",
95 [CTC_EVENT_STOP] = "Stop",
96 /*
97 * additional MPC events
98 */
99 [CTC_EVENT_SEND_XID] = "XID Exchange",
100 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
101 };
102
103 const char *ctc_ch_state_names[] = {
104 [CTC_STATE_IDLE] = "Idle",
105 [CTC_STATE_STOPPED] = "Stopped",
106 [CTC_STATE_STARTWAIT] = "StartWait",
107 [CTC_STATE_STARTRETRY] = "StartRetry",
108 [CTC_STATE_SETUPWAIT] = "SetupWait",
109 [CTC_STATE_RXINIT] = "RX init",
110 [CTC_STATE_TXINIT] = "TX init",
111 [CTC_STATE_RX] = "RX",
112 [CTC_STATE_TX] = "TX",
113 [CTC_STATE_RXIDLE] = "RX idle",
114 [CTC_STATE_TXIDLE] = "TX idle",
115 [CTC_STATE_RXERR] = "RX error",
116 [CTC_STATE_TXERR] = "TX error",
117 [CTC_STATE_TERM] = "Terminating",
118 [CTC_STATE_DTERM] = "Restarting",
119 [CTC_STATE_NOTOP] = "Not operational",
120 /*
121 * additional MPC states
122 */
123 [CH_XID0_PENDING] = "Pending XID0 Start",
124 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
125 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
126 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
127 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
128 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
129 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
130 };
131
132 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133
134 /*
135 * ----- static ctcm actions for channel statemachine -----
136 *
137 */
138 static void chx_txdone(fsm_instance *fi, int event, void *arg);
139 static void chx_rx(fsm_instance *fi, int event, void *arg);
140 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141 static void chx_firstio(fsm_instance *fi, int event, void *arg);
142 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156
157 /*
158 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159 *
160 */
161 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164 /* shared :
165 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179 */
180 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
184
185 /**
186 * Check return code of a preceding ccw_device call, halt_IO etc...
187 *
188 * ch : The channel, the error belongs to.
189 * Returns the error code (!= 0) to inspect.
190 */
191 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
192 {
193 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
194 "%s(%s): %s: %04x\n",
195 CTCM_FUNTAIL, ch->id, msg, rc);
196 switch (rc) {
197 case -EBUSY:
198 pr_info("%s: The communication peer is busy\n",
199 ch->id);
200 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
201 break;
202 case -ENODEV:
203 pr_err("%s: The specified target device is not valid\n",
204 ch->id);
205 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
206 break;
207 default:
208 pr_err("An I/O operation resulted in error %04x\n",
209 rc);
210 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
211 }
212 }
213
214 void ctcm_purge_skb_queue(struct sk_buff_head *q)
215 {
216 struct sk_buff *skb;
217
218 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
219
220 while ((skb = skb_dequeue(q))) {
221 refcount_dec(&skb->users);
222 dev_kfree_skb_any(skb);
223 }
224 }
225
226 /**
227 * NOP action for statemachines
228 */
229 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
230 {
231 }
232
233 /*
234 * Actions for channel - statemachines.
235 */
236
237 /**
238 * Normal data has been send. Free the corresponding
239 * skb (it's in io_queue), reset dev->tbusy and
240 * revert to idle state.
241 *
242 * fi An instance of a channel statemachine.
243 * event The event, just happened.
244 * arg Generic pointer, casted from channel * upon call.
245 */
246 static void chx_txdone(fsm_instance *fi, int event, void *arg)
247 {
248 struct channel *ch = arg;
249 struct net_device *dev = ch->netdev;
250 struct ctcm_priv *priv = dev->ml_priv;
251 struct sk_buff *skb;
252 int first = 1;
253 int i;
254 unsigned long duration;
255 unsigned long done_stamp = jiffies;
256
257 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
258
259 duration = done_stamp - ch->prof.send_stamp;
260 if (duration > ch->prof.tx_time)
261 ch->prof.tx_time = duration;
262
263 if (ch->irb->scsw.cmd.count != 0)
264 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
265 "%s(%s): TX not complete, remaining %d bytes",
266 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
267 fsm_deltimer(&ch->timer);
268 while ((skb = skb_dequeue(&ch->io_queue))) {
269 priv->stats.tx_packets++;
270 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
271 if (first) {
272 priv->stats.tx_bytes += 2;
273 first = 0;
274 }
275 refcount_dec(&skb->users);
276 dev_kfree_skb_irq(skb);
277 }
278 spin_lock(&ch->collect_lock);
279 clear_normalized_cda(&ch->ccw[4]);
280 if (ch->collect_len > 0) {
281 int rc;
282
283 if (ctcm_checkalloc_buffer(ch)) {
284 spin_unlock(&ch->collect_lock);
285 return;
286 }
287 ch->trans_skb->data = ch->trans_skb_data;
288 skb_reset_tail_pointer(ch->trans_skb);
289 ch->trans_skb->len = 0;
290 if (ch->prof.maxmulti < (ch->collect_len + 2))
291 ch->prof.maxmulti = ch->collect_len + 2;
292 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
293 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
294 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
295 i = 0;
296 while ((skb = skb_dequeue(&ch->collect_queue))) {
297 skb_copy_from_linear_data(skb,
298 skb_put(ch->trans_skb, skb->len), skb->len);
299 priv->stats.tx_packets++;
300 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
301 refcount_dec(&skb->users);
302 dev_kfree_skb_irq(skb);
303 i++;
304 }
305 ch->collect_len = 0;
306 spin_unlock(&ch->collect_lock);
307 ch->ccw[1].count = ch->trans_skb->len;
308 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
309 ch->prof.send_stamp = jiffies;
310 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 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], 0, 0xff, 0);
420 if (rc != 0)
421 ctcm_ccw_check_rc(ch, rc, "normal RX");
422 }
423
424 /**
425 * Initialize connection by sending a __u16 of value 0.
426 *
427 * fi An instance of a channel statemachine.
428 * event The event, just happened.
429 * arg Generic pointer, casted from channel * upon call.
430 */
431 static void chx_firstio(fsm_instance *fi, int event, void *arg)
432 {
433 int rc;
434 struct channel *ch = arg;
435 int fsmstate = fsm_getstate(fi);
436
437 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
438 "%s(%s) : %02x",
439 CTCM_FUNTAIL, ch->id, fsmstate);
440
441 ch->sense_rc = 0; /* reset unit check report control */
442 if (fsmstate == CTC_STATE_TXIDLE)
443 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
444 "%s(%s): remote side issued READ?, init.\n",
445 CTCM_FUNTAIL, ch->id);
446 fsm_deltimer(&ch->timer);
447 if (ctcm_checkalloc_buffer(ch))
448 return;
449 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
450 (ch->protocol == CTCM_PROTO_OS390)) {
451 /* OS/390 resp. z/OS */
452 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
453 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
454 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
455 CTC_EVENT_TIMER, ch);
456 chx_rxidle(fi, event, arg);
457 } else {
458 struct net_device *dev = ch->netdev;
459 struct ctcm_priv *priv = dev->ml_priv;
460 fsm_newstate(fi, CTC_STATE_TXIDLE);
461 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
462 }
463 return;
464 }
465 /*
466 * Don't setup a timer for receiving the initial RX frame
467 * if in compatibility mode, since VM TCP delays the initial
468 * frame until it has some data to send.
469 */
470 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
471 (ch->protocol != CTCM_PROTO_S390))
472 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
473
474 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
475 ch->ccw[1].count = 2; /* Transfer only length */
476
477 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
478 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
479 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
480 if (rc != 0) {
481 fsm_deltimer(&ch->timer);
482 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
483 ctcm_ccw_check_rc(ch, rc, "init IO");
484 }
485 /*
486 * If in compatibility mode since we don't setup a timer, we
487 * also signal RX channel up immediately. This enables us
488 * to send packets early which in turn usually triggers some
489 * reply from VM TCP which brings up the RX channel to it's
490 * final state.
491 */
492 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
493 (ch->protocol == CTCM_PROTO_S390)) {
494 struct net_device *dev = ch->netdev;
495 struct ctcm_priv *priv = dev->ml_priv;
496 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
497 }
498 }
499
500 /**
501 * Got initial data, check it. If OK,
502 * notify device statemachine that we are up and
503 * running.
504 *
505 * fi An instance of a channel statemachine.
506 * event The event, just happened.
507 * arg Generic pointer, casted from channel * upon call.
508 */
509 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
510 {
511 struct channel *ch = arg;
512 struct net_device *dev = ch->netdev;
513 struct ctcm_priv *priv = dev->ml_priv;
514 __u16 buflen;
515 int rc;
516
517 fsm_deltimer(&ch->timer);
518 buflen = *((__u16 *)ch->trans_skb->data);
519 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
520 __func__, dev->name, buflen);
521
522 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
523 if (ctcm_checkalloc_buffer(ch))
524 return;
525 ch->ccw[1].count = ch->max_bufsize;
526 fsm_newstate(fi, CTC_STATE_RXIDLE);
527 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
528 if (rc != 0) {
529 fsm_newstate(fi, CTC_STATE_RXINIT);
530 ctcm_ccw_check_rc(ch, rc, "initial RX");
531 } else
532 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
533 } else {
534 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
535 __func__, dev->name,
536 buflen, CTCM_INITIAL_BLOCKLEN);
537 chx_firstio(fi, event, arg);
538 }
539 }
540
541 /**
542 * Set channel into extended mode.
543 *
544 * fi An instance of a channel statemachine.
545 * event The event, just happened.
546 * arg Generic pointer, casted from channel * upon call.
547 */
548 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
549 {
550 struct channel *ch = arg;
551 int rc;
552 unsigned long saveflags = 0;
553 int timeout = CTCM_TIME_5_SEC;
554
555 fsm_deltimer(&ch->timer);
556 if (IS_MPC(ch)) {
557 timeout = 1500;
558 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
559 __func__, smp_processor_id(), ch, ch->id);
560 }
561 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
562 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
563 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
564
565 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
566 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
567 /* Such conditional locking is undeterministic in
568 * static view. => ignore sparse warnings here. */
569
570 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0);
571 if (event == CTC_EVENT_TIMER) /* see above comments */
572 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
573 if (rc != 0) {
574 fsm_deltimer(&ch->timer);
575 fsm_newstate(fi, CTC_STATE_STARTWAIT);
576 ctcm_ccw_check_rc(ch, rc, "set Mode");
577 } else
578 ch->retry = 0;
579 }
580
581 /**
582 * Setup channel.
583 *
584 * fi An instance of a channel statemachine.
585 * event The event, just happened.
586 * arg Generic pointer, casted from channel * upon call.
587 */
588 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
589 {
590 struct channel *ch = arg;
591 unsigned long saveflags;
592 int rc;
593
594 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
595 CTCM_FUNTAIL, ch->id,
596 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
597
598 if (ch->trans_skb != NULL) {
599 clear_normalized_cda(&ch->ccw[1]);
600 dev_kfree_skb(ch->trans_skb);
601 ch->trans_skb = NULL;
602 }
603 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
604 ch->ccw[1].cmd_code = CCW_CMD_READ;
605 ch->ccw[1].flags = CCW_FLAG_SLI;
606 ch->ccw[1].count = 0;
607 } else {
608 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
609 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
610 ch->ccw[1].count = 0;
611 }
612 if (ctcm_checkalloc_buffer(ch)) {
613 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
614 "%s(%s): %s trans_skb alloc delayed "
615 "until first transfer",
616 CTCM_FUNTAIL, ch->id,
617 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
618 "RX" : "TX");
619 }
620 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
621 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
622 ch->ccw[0].count = 0;
623 ch->ccw[0].cda = 0;
624 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
625 ch->ccw[2].flags = CCW_FLAG_SLI;
626 ch->ccw[2].count = 0;
627 ch->ccw[2].cda = 0;
628 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
629 ch->ccw[4].cda = 0;
630 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
631
632 fsm_newstate(fi, CTC_STATE_STARTWAIT);
633 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
634 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
635 rc = ccw_device_halt(ch->cdev, 0);
636 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
637 if (rc != 0) {
638 if (rc != -EBUSY)
639 fsm_deltimer(&ch->timer);
640 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
641 }
642 }
643
644 /**
645 * Shutdown a channel.
646 *
647 * fi An instance of a channel statemachine.
648 * event The event, just happened.
649 * arg Generic pointer, casted from channel * upon call.
650 */
651 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
652 {
653 struct channel *ch = arg;
654 unsigned long saveflags = 0;
655 int rc;
656 int oldstate;
657
658 fsm_deltimer(&ch->timer);
659 if (IS_MPC(ch))
660 fsm_deltimer(&ch->sweep_timer);
661
662 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
663
664 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
665 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
666 /* Such conditional locking is undeterministic in
667 * static view. => ignore sparse warnings here. */
668 oldstate = fsm_getstate(fi);
669 fsm_newstate(fi, CTC_STATE_TERM);
670 rc = ccw_device_halt(ch->cdev, 0);
671
672 if (event == CTC_EVENT_STOP)
673 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
674 /* see remark above about conditional locking */
675
676 if (rc != 0 && rc != -EBUSY) {
677 fsm_deltimer(&ch->timer);
678 if (event != CTC_EVENT_STOP) {
679 fsm_newstate(fi, oldstate);
680 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
681 }
682 }
683 }
684
685 /**
686 * Cleanup helper for chx_fail and chx_stopped
687 * cleanup channels queue and notify interface statemachine.
688 *
689 * fi An instance of a channel statemachine.
690 * state The next state (depending on caller).
691 * ch The channel to operate on.
692 */
693 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
694 struct channel *ch)
695 {
696 struct net_device *dev = ch->netdev;
697 struct ctcm_priv *priv = dev->ml_priv;
698
699 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
700 "%s(%s): %s[%d]\n",
701 CTCM_FUNTAIL, dev->name, ch->id, state);
702
703 fsm_deltimer(&ch->timer);
704 if (IS_MPC(ch))
705 fsm_deltimer(&ch->sweep_timer);
706
707 fsm_newstate(fi, state);
708 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
709 clear_normalized_cda(&ch->ccw[1]);
710 dev_kfree_skb_any(ch->trans_skb);
711 ch->trans_skb = NULL;
712 }
713
714 ch->th_seg = 0x00;
715 ch->th_seq_num = 0x00;
716 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
717 skb_queue_purge(&ch->io_queue);
718 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
719 } else {
720 ctcm_purge_skb_queue(&ch->io_queue);
721 if (IS_MPC(ch))
722 ctcm_purge_skb_queue(&ch->sweep_queue);
723 spin_lock(&ch->collect_lock);
724 ctcm_purge_skb_queue(&ch->collect_queue);
725 ch->collect_len = 0;
726 spin_unlock(&ch->collect_lock);
727 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
728 }
729 }
730
731 /**
732 * A channel has successfully been halted.
733 * Cleanup it's queue and notify interface statemachine.
734 *
735 * fi An instance of a channel statemachine.
736 * event The event, just happened.
737 * arg Generic pointer, casted from channel * upon call.
738 */
739 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
740 {
741 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
742 }
743
744 /**
745 * A stop command from device statemachine arrived and we are in
746 * not operational mode. Set state to stopped.
747 *
748 * fi An instance of a channel statemachine.
749 * event The event, just happened.
750 * arg Generic pointer, casted from channel * upon call.
751 */
752 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
753 {
754 fsm_newstate(fi, CTC_STATE_STOPPED);
755 }
756
757 /**
758 * A machine check for no path, not operational status or gone device has
759 * happened.
760 * Cleanup queue and notify interface statemachine.
761 *
762 * fi An instance of a channel statemachine.
763 * event The event, just happened.
764 * arg Generic pointer, casted from channel * upon call.
765 */
766 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
767 {
768 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
769 }
770
771 /**
772 * Handle error during setup of channel.
773 *
774 * fi An instance of a channel statemachine.
775 * event The event, just happened.
776 * arg Generic pointer, casted from channel * upon call.
777 */
778 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
779 {
780 struct channel *ch = arg;
781 struct net_device *dev = ch->netdev;
782 struct ctcm_priv *priv = dev->ml_priv;
783
784 /*
785 * Special case: Got UC_RCRESET on setmode.
786 * This means that remote side isn't setup. In this case
787 * simply retry after some 10 secs...
788 */
789 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
790 ((event == CTC_EVENT_UC_RCRESET) ||
791 (event == CTC_EVENT_UC_RSRESET))) {
792 fsm_newstate(fi, CTC_STATE_STARTRETRY);
793 fsm_deltimer(&ch->timer);
794 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
795 if (!IS_MPC(ch) &&
796 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
797 int rc = ccw_device_halt(ch->cdev, 0);
798 if (rc != 0)
799 ctcm_ccw_check_rc(ch, rc,
800 "HaltIO in chx_setuperr");
801 }
802 return;
803 }
804
805 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
806 "%s(%s) : %s error during %s channel setup state=%s\n",
807 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
808 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
809 fsm_getstate_str(fi));
810
811 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
812 fsm_newstate(fi, CTC_STATE_RXERR);
813 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
814 } else {
815 fsm_newstate(fi, CTC_STATE_TXERR);
816 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
817 }
818 }
819
820 /**
821 * Restart a channel after an error.
822 *
823 * fi An instance of a channel statemachine.
824 * event The event, just happened.
825 * arg Generic pointer, casted from channel * upon call.
826 */
827 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
828 {
829 struct channel *ch = arg;
830 struct net_device *dev = ch->netdev;
831 unsigned long saveflags = 0;
832 int oldstate;
833 int rc;
834
835 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
836 "%s: %s[%d] of %s\n",
837 CTCM_FUNTAIL, ch->id, event, dev->name);
838
839 fsm_deltimer(&ch->timer);
840
841 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
842 oldstate = fsm_getstate(fi);
843 fsm_newstate(fi, CTC_STATE_STARTWAIT);
844 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
845 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
846 /* Such conditional locking is a known problem for
847 * sparse because its undeterministic in static view.
848 * Warnings should be ignored here. */
849 rc = ccw_device_halt(ch->cdev, 0);
850 if (event == CTC_EVENT_TIMER)
851 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
852 if (rc != 0) {
853 if (rc != -EBUSY) {
854 fsm_deltimer(&ch->timer);
855 fsm_newstate(fi, oldstate);
856 }
857 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
858 }
859 }
860
861 /**
862 * Handle error during RX initial handshake (exchange of
863 * 0-length block header)
864 *
865 * fi An instance of a channel statemachine.
866 * event The event, just happened.
867 * arg Generic pointer, casted from channel * upon call.
868 */
869 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
870 {
871 struct channel *ch = arg;
872 struct net_device *dev = ch->netdev;
873 struct ctcm_priv *priv = dev->ml_priv;
874
875 if (event == CTC_EVENT_TIMER) {
876 if (!IS_MPCDEV(dev))
877 /* TODO : check if MPC deletes timer somewhere */
878 fsm_deltimer(&ch->timer);
879 if (ch->retry++ < 3)
880 ctcm_chx_restart(fi, event, arg);
881 else {
882 fsm_newstate(fi, CTC_STATE_RXERR);
883 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
884 }
885 } else {
886 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
887 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
888 ctc_ch_event_names[event], fsm_getstate_str(fi));
889
890 dev_warn(&dev->dev,
891 "Initialization failed with RX/TX init handshake "
892 "error %s\n", ctc_ch_event_names[event]);
893 }
894 }
895
896 /**
897 * Notify device statemachine if we gave up initialization
898 * of RX channel.
899 *
900 * fi An instance of a channel statemachine.
901 * event The event, just happened.
902 * arg Generic pointer, casted from channel * upon call.
903 */
904 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
905 {
906 struct channel *ch = arg;
907 struct net_device *dev = ch->netdev;
908 struct ctcm_priv *priv = dev->ml_priv;
909
910 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
911 "%s(%s): RX %s busy, init. fail",
912 CTCM_FUNTAIL, dev->name, ch->id);
913 fsm_newstate(fi, CTC_STATE_RXERR);
914 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
915 }
916
917 /**
918 * Handle RX Unit check remote reset (remote disconnected)
919 *
920 * fi An instance of a channel statemachine.
921 * event The event, just happened.
922 * arg Generic pointer, casted from channel * upon call.
923 */
924 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
925 {
926 struct channel *ch = arg;
927 struct channel *ch2;
928 struct net_device *dev = ch->netdev;
929 struct ctcm_priv *priv = dev->ml_priv;
930
931 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
932 "%s: %s: remote disconnect - re-init ...",
933 CTCM_FUNTAIL, dev->name);
934 fsm_deltimer(&ch->timer);
935 /*
936 * Notify device statemachine
937 */
938 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
939 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
940
941 fsm_newstate(fi, CTC_STATE_DTERM);
942 ch2 = priv->channel[CTCM_WRITE];
943 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
944
945 ccw_device_halt(ch->cdev, 0);
946 ccw_device_halt(ch2->cdev, 0);
947 }
948
949 /**
950 * Handle error during TX channel initialization.
951 *
952 * fi An instance of a channel statemachine.
953 * event The event, just happened.
954 * arg Generic pointer, casted from channel * upon call.
955 */
956 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
957 {
958 struct channel *ch = arg;
959 struct net_device *dev = ch->netdev;
960 struct ctcm_priv *priv = dev->ml_priv;
961
962 if (event == CTC_EVENT_TIMER) {
963 fsm_deltimer(&ch->timer);
964 if (ch->retry++ < 3)
965 ctcm_chx_restart(fi, event, arg);
966 else {
967 fsm_newstate(fi, CTC_STATE_TXERR);
968 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
969 }
970 } else {
971 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
972 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
973 ctc_ch_event_names[event], fsm_getstate_str(fi));
974
975 dev_warn(&dev->dev,
976 "Initialization failed with RX/TX init handshake "
977 "error %s\n", ctc_ch_event_names[event]);
978 }
979 }
980
981 /**
982 * Handle TX timeout by retrying operation.
983 *
984 * fi An instance of a channel statemachine.
985 * event The event, just happened.
986 * arg Generic pointer, casted from channel * upon call.
987 */
988 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
989 {
990 struct channel *ch = arg;
991 struct net_device *dev = ch->netdev;
992 struct ctcm_priv *priv = dev->ml_priv;
993 struct sk_buff *skb;
994
995 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
996 __func__, smp_processor_id(), ch, ch->id);
997
998 fsm_deltimer(&ch->timer);
999 if (ch->retry++ > 3) {
1000 struct mpc_group *gptr = priv->mpcg;
1001 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1002 "%s: %s: retries exceeded",
1003 CTCM_FUNTAIL, ch->id);
1004 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1005 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1006 use gptr as mpc indicator */
1007 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1008 ctcm_chx_restart(fi, event, arg);
1009 goto done;
1010 }
1011
1012 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1013 "%s : %s: retry %d",
1014 CTCM_FUNTAIL, ch->id, ch->retry);
1015 skb = skb_peek(&ch->io_queue);
1016 if (skb) {
1017 int rc = 0;
1018 unsigned long saveflags = 0;
1019 clear_normalized_cda(&ch->ccw[4]);
1020 ch->ccw[4].count = skb->len;
1021 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1022 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1023 "%s: %s: IDAL alloc failed",
1024 CTCM_FUNTAIL, ch->id);
1025 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1026 ctcm_chx_restart(fi, event, arg);
1027 goto done;
1028 }
1029 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1030 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1031 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1032 /* Such conditional locking is a known problem for
1033 * sparse because its undeterministic in static view.
1034 * Warnings should be ignored here. */
1035 if (do_debug_ccw)
1036 ctcmpc_dumpit((char *)&ch->ccw[3],
1037 sizeof(struct ccw1) * 3);
1038
1039 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 0xff, 0);
1040 if (event == CTC_EVENT_TIMER)
1041 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1042 saveflags);
1043 if (rc != 0) {
1044 fsm_deltimer(&ch->timer);
1045 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1046 ctcm_purge_skb_queue(&ch->io_queue);
1047 }
1048 }
1049 done:
1050 return;
1051 }
1052
1053 /**
1054 * Handle fatal errors during an I/O command.
1055 *
1056 * fi An instance of a channel statemachine.
1057 * event The event, just happened.
1058 * arg Generic pointer, casted from channel * upon call.
1059 */
1060 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1061 {
1062 struct channel *ch = arg;
1063 struct net_device *dev = ch->netdev;
1064 struct ctcm_priv *priv = dev->ml_priv;
1065 int rd = CHANNEL_DIRECTION(ch->flags);
1066
1067 fsm_deltimer(&ch->timer);
1068 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1069 "%s: %s: %s unrecoverable channel error",
1070 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1071
1072 if (IS_MPC(ch)) {
1073 priv->stats.tx_dropped++;
1074 priv->stats.tx_errors++;
1075 }
1076 if (rd == CTCM_READ) {
1077 fsm_newstate(fi, CTC_STATE_RXERR);
1078 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1079 } else {
1080 fsm_newstate(fi, CTC_STATE_TXERR);
1081 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1082 }
1083 }
1084
1085 /*
1086 * The ctcm statemachine for a channel.
1087 */
1088 const fsm_node ch_fsm[] = {
1089 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1090 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1091 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1092 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1093
1094 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1095 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1096 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1097 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1098 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1099
1100 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1101 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1102 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1103 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1104 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1105 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1106
1107 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1108 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1109 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1110 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1111
1112 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1113 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1114 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1115 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1116 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1117 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1120
1121 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1122 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1123 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1124 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1125 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1126 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1127 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1128 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1129 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1130 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1131
1132 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1133 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1134 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1135 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1136 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1137 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1138 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1139
1140 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1141 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1142 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1143 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1144 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1145 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1146 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1147 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1148
1149 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1150 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1151 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1152 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1153 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1154 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1155 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1156
1157 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1158 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1159 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1160 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1161 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1162 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1163
1164 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1165 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1166 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1167 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1168 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1169 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1170
1171 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1172 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1173 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1174 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1175 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1176 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1177 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1178 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1179
1180 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1181 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1182 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1183 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1184 };
1185
1186 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1187
1188 /*
1189 * MPC actions for mpc channel statemachine
1190 * handling of MPC protocol requires extra
1191 * statemachine and actions which are prefixed ctcmpc_ .
1192 * The ctc_ch_states and ctc_ch_state_names,
1193 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1194 * which are expanded by some elements.
1195 */
1196
1197 /*
1198 * Actions for mpc channel statemachine.
1199 */
1200
1201 /**
1202 * Normal data has been send. Free the corresponding
1203 * skb (it's in io_queue), reset dev->tbusy and
1204 * revert to idle state.
1205 *
1206 * fi An instance of a channel statemachine.
1207 * event The event, just happened.
1208 * arg Generic pointer, casted from channel * upon call.
1209 */
1210 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1211 {
1212 struct channel *ch = arg;
1213 struct net_device *dev = ch->netdev;
1214 struct ctcm_priv *priv = dev->ml_priv;
1215 struct mpc_group *grp = priv->mpcg;
1216 struct sk_buff *skb;
1217 int first = 1;
1218 int i;
1219 __u32 data_space;
1220 unsigned long duration;
1221 struct sk_buff *peekskb;
1222 int rc;
1223 struct th_header *header;
1224 struct pdu *p_header;
1225 unsigned long done_stamp = jiffies;
1226
1227 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1228 __func__, dev->name, smp_processor_id());
1229
1230 duration = done_stamp - ch->prof.send_stamp;
1231 if (duration > ch->prof.tx_time)
1232 ch->prof.tx_time = duration;
1233
1234 if (ch->irb->scsw.cmd.count != 0)
1235 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1236 "%s(%s): TX not complete, remaining %d bytes",
1237 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1238 fsm_deltimer(&ch->timer);
1239 while ((skb = skb_dequeue(&ch->io_queue))) {
1240 priv->stats.tx_packets++;
1241 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1242 if (first) {
1243 priv->stats.tx_bytes += 2;
1244 first = 0;
1245 }
1246 refcount_dec(&skb->users);
1247 dev_kfree_skb_irq(skb);
1248 }
1249 spin_lock(&ch->collect_lock);
1250 clear_normalized_cda(&ch->ccw[4]);
1251 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1252 spin_unlock(&ch->collect_lock);
1253 fsm_newstate(fi, CTC_STATE_TXIDLE);
1254 goto done;
1255 }
1256
1257 if (ctcm_checkalloc_buffer(ch)) {
1258 spin_unlock(&ch->collect_lock);
1259 goto done;
1260 }
1261 ch->trans_skb->data = ch->trans_skb_data;
1262 skb_reset_tail_pointer(ch->trans_skb);
1263 ch->trans_skb->len = 0;
1264 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1265 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1266 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1267 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1268 i = 0;
1269 p_header = NULL;
1270 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1271
1272 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1273 " data_space:%04x\n",
1274 __func__, data_space);
1275
1276 while ((skb = skb_dequeue(&ch->collect_queue))) {
1277 skb_put_data(ch->trans_skb, skb->data, skb->len);
1278 p_header = (struct pdu *)
1279 (skb_tail_pointer(ch->trans_skb) - skb->len);
1280 p_header->pdu_flag = 0x00;
1281 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
1282 p_header->pdu_flag |= 0x60;
1283 else
1284 p_header->pdu_flag |= 0x20;
1285
1286 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1287 __func__, ch->trans_skb->len);
1288 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1289 " to 32 bytes sent to vtam\n", __func__);
1290 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1291
1292 ch->collect_len -= skb->len;
1293 data_space -= skb->len;
1294 priv->stats.tx_packets++;
1295 priv->stats.tx_bytes += skb->len;
1296 refcount_dec(&skb->users);
1297 dev_kfree_skb_any(skb);
1298 peekskb = skb_peek(&ch->collect_queue);
1299 if (peekskb->len > data_space)
1300 break;
1301 i++;
1302 }
1303 /* p_header points to the last one we handled */
1304 if (p_header)
1305 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1306 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1307 if (!header) {
1308 spin_unlock(&ch->collect_lock);
1309 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1310 goto done;
1311 }
1312 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1313 ch->th_seq_num++;
1314 header->th_seq_num = ch->th_seq_num;
1315
1316 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1317 __func__, ch->th_seq_num);
1318
1319 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1320 TH_HEADER_LENGTH); /* put the TH on the packet */
1321
1322 kfree(header);
1323
1324 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1325 __func__, ch->trans_skb->len);
1326 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1327 "data to vtam from collect_q\n", __func__);
1328 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1329 min_t(int, ch->trans_skb->len, 50));
1330
1331 spin_unlock(&ch->collect_lock);
1332 clear_normalized_cda(&ch->ccw[1]);
1333
1334 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1335 (void *)(unsigned long)ch->ccw[1].cda,
1336 ch->trans_skb->data);
1337 ch->ccw[1].count = ch->max_bufsize;
1338
1339 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1340 dev_kfree_skb_any(ch->trans_skb);
1341 ch->trans_skb = NULL;
1342 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1343 "%s: %s: IDAL alloc failed",
1344 CTCM_FUNTAIL, ch->id);
1345 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1346 return;
1347 }
1348
1349 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1350 (void *)(unsigned long)ch->ccw[1].cda,
1351 ch->trans_skb->data);
1352
1353 ch->ccw[1].count = ch->trans_skb->len;
1354 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1355 ch->prof.send_stamp = jiffies;
1356 if (do_debug_ccw)
1357 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1358 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1359 ch->prof.doios_multi++;
1360 if (rc != 0) {
1361 priv->stats.tx_dropped += i;
1362 priv->stats.tx_errors += i;
1363 fsm_deltimer(&ch->timer);
1364 ctcm_ccw_check_rc(ch, rc, "chained TX");
1365 }
1366 done:
1367 ctcm_clear_busy(dev);
1368 return;
1369 }
1370
1371 /**
1372 * Got normal data, check for sanity, queue it up, allocate new buffer
1373 * trigger bottom half, and initiate next read.
1374 *
1375 * fi An instance of a channel statemachine.
1376 * event The event, just happened.
1377 * arg Generic pointer, casted from channel * upon call.
1378 */
1379 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1380 {
1381 struct channel *ch = arg;
1382 struct net_device *dev = ch->netdev;
1383 struct ctcm_priv *priv = dev->ml_priv;
1384 struct mpc_group *grp = priv->mpcg;
1385 struct sk_buff *skb = ch->trans_skb;
1386 struct sk_buff *new_skb;
1387 unsigned long saveflags = 0; /* avoids compiler warning */
1388 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1389
1390 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1391 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1392 ch->id, ch->max_bufsize, len);
1393 fsm_deltimer(&ch->timer);
1394
1395 if (skb == NULL) {
1396 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1397 "%s(%s): TRANS_SKB = NULL",
1398 CTCM_FUNTAIL, dev->name);
1399 goto again;
1400 }
1401
1402 if (len < TH_HEADER_LENGTH) {
1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1404 "%s(%s): packet length %d to short",
1405 CTCM_FUNTAIL, dev->name, len);
1406 priv->stats.rx_dropped++;
1407 priv->stats.rx_length_errors++;
1408 } else {
1409 /* must have valid th header or game over */
1410 __u32 block_len = len;
1411 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1412 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1413
1414 if (new_skb == NULL) {
1415 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1416 "%s(%d): skb allocation failed",
1417 CTCM_FUNTAIL, dev->name);
1418 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1419 goto again;
1420 }
1421 switch (fsm_getstate(grp->fsm)) {
1422 case MPCG_STATE_RESET:
1423 case MPCG_STATE_INOP:
1424 dev_kfree_skb_any(new_skb);
1425 break;
1426 case MPCG_STATE_FLOWC:
1427 case MPCG_STATE_READY:
1428 skb_put_data(new_skb, skb->data, block_len);
1429 skb_queue_tail(&ch->io_queue, new_skb);
1430 tasklet_schedule(&ch->ch_tasklet);
1431 break;
1432 default:
1433 skb_put_data(new_skb, skb->data, len);
1434 skb_queue_tail(&ch->io_queue, new_skb);
1435 tasklet_hi_schedule(&ch->ch_tasklet);
1436 break;
1437 }
1438 }
1439
1440 again:
1441 switch (fsm_getstate(grp->fsm)) {
1442 int rc, dolock;
1443 case MPCG_STATE_FLOWC:
1444 case MPCG_STATE_READY:
1445 if (ctcm_checkalloc_buffer(ch))
1446 break;
1447 ch->trans_skb->data = ch->trans_skb_data;
1448 skb_reset_tail_pointer(ch->trans_skb);
1449 ch->trans_skb->len = 0;
1450 ch->ccw[1].count = ch->max_bufsize;
1451 if (do_debug_ccw)
1452 ctcmpc_dumpit((char *)&ch->ccw[0],
1453 sizeof(struct ccw1) * 3);
1454 dolock = !in_irq();
1455 if (dolock)
1456 spin_lock_irqsave(
1457 get_ccwdev_lock(ch->cdev), saveflags);
1458 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1459 if (dolock) /* see remark about conditional locking */
1460 spin_unlock_irqrestore(
1461 get_ccwdev_lock(ch->cdev), saveflags);
1462 if (rc != 0)
1463 ctcm_ccw_check_rc(ch, rc, "normal RX");
1464 default:
1465 break;
1466 }
1467
1468 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1469 __func__, dev->name, ch, ch->id);
1470
1471 }
1472
1473 /**
1474 * Initialize connection by sending a __u16 of value 0.
1475 *
1476 * fi An instance of a channel statemachine.
1477 * event The event, just happened.
1478 * arg Generic pointer, casted from channel * upon call.
1479 */
1480 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1481 {
1482 struct channel *ch = arg;
1483 struct net_device *dev = ch->netdev;
1484 struct ctcm_priv *priv = dev->ml_priv;
1485 struct mpc_group *gptr = priv->mpcg;
1486
1487 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1488 __func__, ch->id, ch);
1489
1490 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1491 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1492 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1493 fsm_getstate(gptr->fsm), ch->protocol);
1494
1495 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1496 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1497
1498 fsm_deltimer(&ch->timer);
1499 if (ctcm_checkalloc_buffer(ch))
1500 goto done;
1501
1502 switch (fsm_getstate(fi)) {
1503 case CTC_STATE_STARTRETRY:
1504 case CTC_STATE_SETUPWAIT:
1505 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1506 ctcmpc_chx_rxidle(fi, event, arg);
1507 } else {
1508 fsm_newstate(fi, CTC_STATE_TXIDLE);
1509 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1510 }
1511 goto done;
1512 default:
1513 break;
1514 }
1515
1516 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1517 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1518
1519 done:
1520 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1521 __func__, ch->id, ch);
1522 return;
1523 }
1524
1525 /**
1526 * Got initial data, check it. If OK,
1527 * notify device statemachine that we are up and
1528 * running.
1529 *
1530 * fi An instance of a channel statemachine.
1531 * event The event, just happened.
1532 * arg Generic pointer, casted from channel * upon call.
1533 */
1534 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1535 {
1536 struct channel *ch = arg;
1537 struct net_device *dev = ch->netdev;
1538 struct ctcm_priv *priv = dev->ml_priv;
1539 struct mpc_group *grp = priv->mpcg;
1540 int rc;
1541 unsigned long saveflags = 0; /* avoids compiler warning */
1542
1543 fsm_deltimer(&ch->timer);
1544 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1545 __func__, ch->id, dev->name, smp_processor_id(),
1546 fsm_getstate(fi), fsm_getstate(grp->fsm));
1547
1548 fsm_newstate(fi, CTC_STATE_RXIDLE);
1549 /* XID processing complete */
1550
1551 switch (fsm_getstate(grp->fsm)) {
1552 case MPCG_STATE_FLOWC:
1553 case MPCG_STATE_READY:
1554 if (ctcm_checkalloc_buffer(ch))
1555 goto done;
1556 ch->trans_skb->data = ch->trans_skb_data;
1557 skb_reset_tail_pointer(ch->trans_skb);
1558 ch->trans_skb->len = 0;
1559 ch->ccw[1].count = ch->max_bufsize;
1560 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1561 if (event == CTC_EVENT_START)
1562 /* see remark about conditional locking */
1563 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1564 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1565 if (event == CTC_EVENT_START)
1566 spin_unlock_irqrestore(
1567 get_ccwdev_lock(ch->cdev), saveflags);
1568 if (rc != 0) {
1569 fsm_newstate(fi, CTC_STATE_RXINIT);
1570 ctcm_ccw_check_rc(ch, rc, "initial RX");
1571 goto done;
1572 }
1573 break;
1574 default:
1575 break;
1576 }
1577
1578 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1579 done:
1580 return;
1581 }
1582
1583 /*
1584 * ctcmpc channel FSM action
1585 * called from several points in ctcmpc_ch_fsm
1586 * ctcmpc only
1587 */
1588 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1589 {
1590 struct channel *ch = arg;
1591 struct net_device *dev = ch->netdev;
1592 struct ctcm_priv *priv = dev->ml_priv;
1593 struct mpc_group *grp = priv->mpcg;
1594
1595 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1596 __func__, dev->name, ch->id, ch, smp_processor_id(),
1597 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1598
1599 switch (fsm_getstate(grp->fsm)) {
1600 case MPCG_STATE_XID2INITW:
1601 /* ok..start yside xid exchanges */
1602 if (!ch->in_mpcgroup)
1603 break;
1604 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1605 fsm_deltimer(&grp->timer);
1606 fsm_addtimer(&grp->timer,
1607 MPC_XID_TIMEOUT_VALUE,
1608 MPCG_EVENT_TIMER, dev);
1609 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1610
1611 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1612 /* attn rcvd before xid0 processed via bh */
1613 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1614 break;
1615 case MPCG_STATE_XID2INITX:
1616 case MPCG_STATE_XID0IOWAIT:
1617 case MPCG_STATE_XID0IOWAIX:
1618 /* attn rcvd before xid0 processed on ch
1619 but mid-xid0 processing for group */
1620 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1621 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1622 break;
1623 case MPCG_STATE_XID7INITW:
1624 case MPCG_STATE_XID7INITX:
1625 case MPCG_STATE_XID7INITI:
1626 case MPCG_STATE_XID7INITZ:
1627 switch (fsm_getstate(ch->fsm)) {
1628 case CH_XID7_PENDING:
1629 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1630 break;
1631 case CH_XID7_PENDING2:
1632 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1633 break;
1634 }
1635 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1636 break;
1637 }
1638
1639 return;
1640 }
1641
1642 /*
1643 * ctcmpc channel FSM action
1644 * called from one point in ctcmpc_ch_fsm
1645 * ctcmpc only
1646 */
1647 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1648 {
1649 struct channel *ch = arg;
1650 struct net_device *dev = ch->netdev;
1651 struct ctcm_priv *priv = dev->ml_priv;
1652 struct mpc_group *grp = priv->mpcg;
1653
1654 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1655 __func__, dev->name, ch->id,
1656 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1657
1658 fsm_deltimer(&ch->timer);
1659
1660 switch (fsm_getstate(grp->fsm)) {
1661 case MPCG_STATE_XID0IOWAIT:
1662 /* vtam wants to be primary.start yside xid exchanges*/
1663 /* only receive one attn-busy at a time so must not */
1664 /* change state each time */
1665 grp->changed_side = 1;
1666 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1667 break;
1668 case MPCG_STATE_XID2INITW:
1669 if (grp->changed_side == 1) {
1670 grp->changed_side = 2;
1671 break;
1672 }
1673 /* process began via call to establish_conn */
1674 /* so must report failure instead of reverting */
1675 /* back to ready-for-xid passive state */
1676 if (grp->estconnfunc)
1677 goto done;
1678 /* this attnbusy is NOT the result of xside xid */
1679 /* collisions so yside must have been triggered */
1680 /* by an ATTN that was not intended to start XID */
1681 /* processing. Revert back to ready-for-xid and */
1682 /* wait for ATTN interrupt to signal xid start */
1683 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1684 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1685 fsm_deltimer(&grp->timer);
1686 goto done;
1687 }
1688 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1689 goto done;
1690 case MPCG_STATE_XID2INITX:
1691 /* XID2 was received before ATTN Busy for second
1692 channel.Send yside xid for second channel.
1693 */
1694 if (grp->changed_side == 1) {
1695 grp->changed_side = 2;
1696 break;
1697 }
1698 /* Else, fall through */
1699 case MPCG_STATE_XID0IOWAIX:
1700 case MPCG_STATE_XID7INITW:
1701 case MPCG_STATE_XID7INITX:
1702 case MPCG_STATE_XID7INITI:
1703 case MPCG_STATE_XID7INITZ:
1704 default:
1705 /* multiple attn-busy indicates too out-of-sync */
1706 /* and they are certainly not being received as part */
1707 /* of valid mpc group negotiations.. */
1708 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1709 goto done;
1710 }
1711
1712 if (grp->changed_side == 1) {
1713 fsm_deltimer(&grp->timer);
1714 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1715 MPCG_EVENT_TIMER, dev);
1716 }
1717 if (ch->in_mpcgroup)
1718 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1719 else
1720 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1721 "%s(%s): channel %s not added to group",
1722 CTCM_FUNTAIL, dev->name, ch->id);
1723
1724 done:
1725 return;
1726 }
1727
1728 /*
1729 * ctcmpc channel FSM action
1730 * called from several points in ctcmpc_ch_fsm
1731 * ctcmpc only
1732 */
1733 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1734 {
1735 struct channel *ch = arg;
1736 struct net_device *dev = ch->netdev;
1737 struct ctcm_priv *priv = dev->ml_priv;
1738 struct mpc_group *grp = priv->mpcg;
1739
1740 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1741 return;
1742 }
1743
1744 /*
1745 * ctcmpc channel FSM action
1746 * called from several points in ctcmpc_ch_fsm
1747 * ctcmpc only
1748 */
1749 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1750 {
1751 struct channel *ach = arg;
1752 struct net_device *dev = ach->netdev;
1753 struct ctcm_priv *priv = dev->ml_priv;
1754 struct mpc_group *grp = priv->mpcg;
1755 struct channel *wch = priv->channel[CTCM_WRITE];
1756 struct channel *rch = priv->channel[CTCM_READ];
1757 struct sk_buff *skb;
1758 struct th_sweep *header;
1759 int rc = 0;
1760 unsigned long saveflags = 0;
1761
1762 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1763 __func__, smp_processor_id(), ach, ach->id);
1764
1765 if (grp->in_sweep == 0)
1766 goto done;
1767
1768 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1769 __func__, wch->th_seq_num);
1770 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1771 __func__, rch->th_seq_num);
1772
1773 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1774 /* give the previous IO time to complete */
1775 fsm_addtimer(&wch->sweep_timer,
1776 200, CTC_EVENT_RSWEEP_TIMER, wch);
1777 goto done;
1778 }
1779
1780 skb = skb_dequeue(&wch->sweep_queue);
1781 if (!skb)
1782 goto done;
1783
1784 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1785 grp->in_sweep = 0;
1786 ctcm_clear_busy_do(dev);
1787 dev_kfree_skb_any(skb);
1788 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1789 goto done;
1790 } else {
1791 refcount_inc(&skb->users);
1792 skb_queue_tail(&wch->io_queue, skb);
1793 }
1794
1795 /* send out the sweep */
1796 wch->ccw[4].count = skb->len;
1797
1798 header = (struct th_sweep *)skb->data;
1799 switch (header->th.th_ch_flag) {
1800 case TH_SWEEP_REQ:
1801 grp->sweep_req_pend_num--;
1802 break;
1803 case TH_SWEEP_RESP:
1804 grp->sweep_rsp_pend_num--;
1805 break;
1806 }
1807
1808 header->sw.th_last_seq = wch->th_seq_num;
1809
1810 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1811 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1812 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1813
1814 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1815 fsm_newstate(wch->fsm, CTC_STATE_TX);
1816
1817 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1818 wch->prof.send_stamp = jiffies;
1819 rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0);
1820 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1821
1822 if ((grp->sweep_req_pend_num == 0) &&
1823 (grp->sweep_rsp_pend_num == 0)) {
1824 grp->in_sweep = 0;
1825 rch->th_seq_num = 0x00;
1826 wch->th_seq_num = 0x00;
1827 ctcm_clear_busy_do(dev);
1828 }
1829
1830 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1831 __func__, wch->th_seq_num, rch->th_seq_num);
1832
1833 if (rc != 0)
1834 ctcm_ccw_check_rc(wch, rc, "send sweep");
1835
1836 done:
1837 return;
1838 }
1839
1840
1841 /*
1842 * The ctcmpc statemachine for a channel.
1843 */
1844
1845 const fsm_node ctcmpc_ch_fsm[] = {
1846 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1847 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1848 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1849 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1850 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1851
1852 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1853 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1854 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1855 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1856 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1857 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1858 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1859 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1860
1861 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1862 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1863 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1864 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1865 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1866 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1867
1868 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1869 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1870 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1871 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1872 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1873
1874 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1875 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1876 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1877 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1878 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1879 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1880 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1881 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1882
1883 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1884 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1885 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1886 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1887 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1888 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1889 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1890 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1891 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1892 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1893
1894 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1895 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1896 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1897 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1898 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1899 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1900 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1901 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1902 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1903 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1904
1905 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1906 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1907 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1908 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1909 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1910 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1911 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1912 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1913 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1914 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1915 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1916
1917 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1918 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1919 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1920 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1921 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1922 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1923 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1924 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1925 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1926 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1927 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1928 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1929 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1930
1931 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1932 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1933 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1934 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1935 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1936 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1937 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1938 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1939 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1940 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1941 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1942 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1943
1944 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1945 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1946 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1947 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1948 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1949 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1950 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1951 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1952 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1953 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1954 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1955 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1956
1957 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1958 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1959 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1960 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1961 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1962 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1963 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1964 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1965 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1966 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1967 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1968 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1969
1970 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1971 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1972 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1973 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1974 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1975 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1976 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1977 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1978 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1979 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1980 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1981 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1982
1983 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1984 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1985 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1986 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1987 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1988 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1989 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1990 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1991
1992 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1993 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1994 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1995 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1996 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1997 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1998 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1999 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2000 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2001
2002 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2003 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2004 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2005 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2006 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2007 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2008 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2009 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2010
2011 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2012 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2013 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2014 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2015 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2016 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2017 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2018 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2019
2020 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2021 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2022 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2023 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2024 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2025 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2026 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2027
2028 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2029 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2030 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2031 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2032 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2033 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2034 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2035 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2036 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2037 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2038
2039 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2040 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2041 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2042 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2043 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2044 };
2045
2046 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2047
2048 /*
2049 * Actions for interface - statemachine.
2050 */
2051
2052 /**
2053 * Startup channels by sending CTC_EVENT_START to each channel.
2054 *
2055 * fi An instance of an interface statemachine.
2056 * event The event, just happened.
2057 * arg Generic pointer, casted from struct net_device * upon call.
2058 */
2059 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2060 {
2061 struct net_device *dev = arg;
2062 struct ctcm_priv *priv = dev->ml_priv;
2063 int direction;
2064
2065 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2066
2067 fsm_deltimer(&priv->restart_timer);
2068 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2069 if (IS_MPC(priv))
2070 priv->mpcg->channels_terminating = 0;
2071 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2072 struct channel *ch = priv->channel[direction];
2073 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2074 }
2075 }
2076
2077 /**
2078 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2079 *
2080 * fi An instance of an interface statemachine.
2081 * event The event, just happened.
2082 * arg Generic pointer, casted from struct net_device * upon call.
2083 */
2084 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2085 {
2086 int direction;
2087 struct net_device *dev = arg;
2088 struct ctcm_priv *priv = dev->ml_priv;
2089
2090 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2091
2092 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2093 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2094 struct channel *ch = priv->channel[direction];
2095 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2096 ch->th_seq_num = 0x00;
2097 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2098 __func__, ch->th_seq_num);
2099 }
2100 if (IS_MPC(priv))
2101 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2102 }
2103
2104 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2105 {
2106 int restart_timer;
2107 struct net_device *dev = arg;
2108 struct ctcm_priv *priv = dev->ml_priv;
2109
2110 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2111
2112 if (IS_MPC(priv)) {
2113 restart_timer = CTCM_TIME_1_SEC;
2114 } else {
2115 restart_timer = CTCM_TIME_5_SEC;
2116 }
2117 dev_info(&dev->dev, "Restarting device\n");
2118
2119 dev_action_stop(fi, event, arg);
2120 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2121 if (IS_MPC(priv))
2122 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2123
2124 /* going back into start sequence too quickly can */
2125 /* result in the other side becoming unreachable due */
2126 /* to sense reported when IO is aborted */
2127 fsm_addtimer(&priv->restart_timer, restart_timer,
2128 DEV_EVENT_START, dev);
2129 }
2130
2131 /**
2132 * Called from channel statemachine
2133 * when a channel is up and running.
2134 *
2135 * fi An instance of an interface statemachine.
2136 * event The event, just happened.
2137 * arg Generic pointer, casted from struct net_device * upon call.
2138 */
2139 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2140 {
2141 struct net_device *dev = arg;
2142 struct ctcm_priv *priv = dev->ml_priv;
2143 int dev_stat = fsm_getstate(fi);
2144
2145 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2146 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2147 dev->name, dev->ml_priv, dev_stat, event);
2148
2149 switch (fsm_getstate(fi)) {
2150 case DEV_STATE_STARTWAIT_RXTX:
2151 if (event == DEV_EVENT_RXUP)
2152 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2153 else
2154 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2155 break;
2156 case DEV_STATE_STARTWAIT_RX:
2157 if (event == DEV_EVENT_RXUP) {
2158 fsm_newstate(fi, DEV_STATE_RUNNING);
2159 dev_info(&dev->dev,
2160 "Connected with remote side\n");
2161 ctcm_clear_busy(dev);
2162 }
2163 break;
2164 case DEV_STATE_STARTWAIT_TX:
2165 if (event == DEV_EVENT_TXUP) {
2166 fsm_newstate(fi, DEV_STATE_RUNNING);
2167 dev_info(&dev->dev,
2168 "Connected with remote side\n");
2169 ctcm_clear_busy(dev);
2170 }
2171 break;
2172 case DEV_STATE_STOPWAIT_TX:
2173 if (event == DEV_EVENT_RXUP)
2174 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2175 break;
2176 case DEV_STATE_STOPWAIT_RX:
2177 if (event == DEV_EVENT_TXUP)
2178 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2179 break;
2180 }
2181
2182 if (IS_MPC(priv)) {
2183 if (event == DEV_EVENT_RXUP)
2184 mpc_channel_action(priv->channel[CTCM_READ],
2185 CTCM_READ, MPC_CHANNEL_ADD);
2186 else
2187 mpc_channel_action(priv->channel[CTCM_WRITE],
2188 CTCM_WRITE, MPC_CHANNEL_ADD);
2189 }
2190 }
2191
2192 /**
2193 * Called from device statemachine
2194 * when a channel has been shutdown.
2195 *
2196 * fi An instance of an interface statemachine.
2197 * event The event, just happened.
2198 * arg Generic pointer, casted from struct net_device * upon call.
2199 */
2200 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2201 {
2202
2203 struct net_device *dev = arg;
2204 struct ctcm_priv *priv = dev->ml_priv;
2205
2206 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2207
2208 switch (fsm_getstate(fi)) {
2209 case DEV_STATE_RUNNING:
2210 if (event == DEV_EVENT_TXDOWN)
2211 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2212 else
2213 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2214 break;
2215 case DEV_STATE_STARTWAIT_RX:
2216 if (event == DEV_EVENT_TXDOWN)
2217 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2218 break;
2219 case DEV_STATE_STARTWAIT_TX:
2220 if (event == DEV_EVENT_RXDOWN)
2221 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2222 break;
2223 case DEV_STATE_STOPWAIT_RXTX:
2224 if (event == DEV_EVENT_TXDOWN)
2225 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2226 else
2227 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2228 break;
2229 case DEV_STATE_STOPWAIT_RX:
2230 if (event == DEV_EVENT_RXDOWN)
2231 fsm_newstate(fi, DEV_STATE_STOPPED);
2232 break;
2233 case DEV_STATE_STOPWAIT_TX:
2234 if (event == DEV_EVENT_TXDOWN)
2235 fsm_newstate(fi, DEV_STATE_STOPPED);
2236 break;
2237 }
2238 if (IS_MPC(priv)) {
2239 if (event == DEV_EVENT_RXDOWN)
2240 mpc_channel_action(priv->channel[CTCM_READ],
2241 CTCM_READ, MPC_CHANNEL_REMOVE);
2242 else
2243 mpc_channel_action(priv->channel[CTCM_WRITE],
2244 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2245 }
2246 }
2247
2248 const fsm_node dev_fsm[] = {
2249 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2250 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2251 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2252 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2253 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2254 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2255 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2256 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2257 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2258 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2259 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2260 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2261 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2262 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2263 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2264 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2265 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2266 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2267 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2268 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2269 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2270 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2271 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2272 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2273 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2274 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2275 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2276 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2277 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2278 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2279 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2280 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2281 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2282 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2283 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2284 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2285 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2286 };
2287
2288 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2289
2290 /* --- This is the END my friend --- */
2291
Linux with added FPC-III support