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1/*
2 * drivers/s390/net/ctcm_fsms.c
3 *
4 * Copyright IBM Corp. 2001, 2007
5 * Authors: Fritz Elfert (felfert@millenux.com)
6 * Peter Tiedemann (ptiedem@de.ibm.com)
7 * MPC additions :
8 * Belinda Thompson (belindat@us.ibm.com)
9 * Andy Richter (richtera@us.ibm.com)
10 */
11
12#undef DEBUG
13#undef DEBUGDATA
14#undef DEBUGCCW
15
16#define KMSG_COMPONENT "ctcm"
17#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
18
19#include <linux/module.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/slab.h>
23#include <linux/errno.h>
24#include <linux/types.h>
25#include <linux/interrupt.h>
26#include <linux/timer.h>
27#include <linux/bitops.h>
28
29#include <linux/signal.h>
30#include <linux/string.h>
31
32#include <linux/ip.h>
33#include <linux/if_arp.h>
34#include <linux/tcp.h>
35#include <linux/skbuff.h>
36#include <linux/ctype.h>
37#include <net/dst.h>
38
39#include <linux/io.h>
40#include <asm/ccwdev.h>
41#include <asm/ccwgroup.h>
42#include <linux/uaccess.h>
43
44#include <asm/idals.h>
45
46#include "fsm.h"
47
48#include "ctcm_dbug.h"
49#include "ctcm_main.h"
50#include "ctcm_fsms.h"
51
52const char *dev_state_names[] = {
53 [DEV_STATE_STOPPED] = "Stopped",
54 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
55 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
56 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
57 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
58 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
59 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
60 [DEV_STATE_RUNNING] = "Running",
61};
62
63const char *dev_event_names[] = {
64 [DEV_EVENT_START] = "Start",
65 [DEV_EVENT_STOP] = "Stop",
66 [DEV_EVENT_RXUP] = "RX up",
67 [DEV_EVENT_TXUP] = "TX up",
68 [DEV_EVENT_RXDOWN] = "RX down",
69 [DEV_EVENT_TXDOWN] = "TX down",
70 [DEV_EVENT_RESTART] = "Restart",
71};
72
73const char *ctc_ch_event_names[] = {
74 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
75 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
76 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
77 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
78 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
79 [CTC_EVENT_ATTN] = "Status ATTN",
80 [CTC_EVENT_BUSY] = "Status BUSY",
81 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
82 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
83 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
84 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
85 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
86 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
87 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
88 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
89 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
90 [CTC_EVENT_MC_FAIL] = "Machine check failure",
91 [CTC_EVENT_MC_GOOD] = "Machine check operational",
92 [CTC_EVENT_IRQ] = "IRQ normal",
93 [CTC_EVENT_FINSTAT] = "IRQ final",
94 [CTC_EVENT_TIMER] = "Timer",
95 [CTC_EVENT_START] = "Start",
96 [CTC_EVENT_STOP] = "Stop",
97 /*
98 * additional MPC events
99 */
100 [CTC_EVENT_SEND_XID] = "XID Exchange",
101 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
102};
103
104const char *ctc_ch_state_names[] = {
105 [CTC_STATE_IDLE] = "Idle",
106 [CTC_STATE_STOPPED] = "Stopped",
107 [CTC_STATE_STARTWAIT] = "StartWait",
108 [CTC_STATE_STARTRETRY] = "StartRetry",
109 [CTC_STATE_SETUPWAIT] = "SetupWait",
110 [CTC_STATE_RXINIT] = "RX init",
111 [CTC_STATE_TXINIT] = "TX init",
112 [CTC_STATE_RX] = "RX",
113 [CTC_STATE_TX] = "TX",
114 [CTC_STATE_RXIDLE] = "RX idle",
115 [CTC_STATE_TXIDLE] = "TX idle",
116 [CTC_STATE_RXERR] = "RX error",
117 [CTC_STATE_TXERR] = "TX error",
118 [CTC_STATE_TERM] = "Terminating",
119 [CTC_STATE_DTERM] = "Restarting",
120 [CTC_STATE_NOTOP] = "Not operational",
121 /*
122 * additional MPC states
123 */
124 [CH_XID0_PENDING] = "Pending XID0 Start",
125 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
126 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
127 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
128 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
129 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
130 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
131};
132
133static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
134
135/*
136 * ----- static ctcm actions for channel statemachine -----
137 *
138*/
139static void chx_txdone(fsm_instance *fi, int event, void *arg);
140static void chx_rx(fsm_instance *fi, int event, void *arg);
141static void chx_rxidle(fsm_instance *fi, int event, void *arg);
142static void chx_firstio(fsm_instance *fi, int event, void *arg);
143static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
144static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
145static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
146static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
147static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
148static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
149static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
150static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
151static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
152static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
153static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
154static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
155static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
156static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
157
158/*
159 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
160 *
161*/
162static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
163static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
164static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
165/* shared :
166static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
167static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
168static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
169static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
170static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
171static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
172static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
173static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
174static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
175static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
176static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
177static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
178static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
179static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
180*/
181static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
182static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
183static void ctcmpc_chx_resend(fsm_instance *, int, void *);
184static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
185
186/**
187 * Check return code of a preceding ccw_device call, halt_IO etc...
188 *
189 * ch : The channel, the error belongs to.
190 * Returns the error code (!= 0) to inspect.
191 */
192void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
193{
194 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
195 "%s(%s): %s: %04x\n",
196 CTCM_FUNTAIL, ch->id, msg, rc);
197 switch (rc) {
198 case -EBUSY:
199 pr_info("%s: The communication peer is busy\n",
200 ch->id);
201 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
202 break;
203 case -ENODEV:
204 pr_err("%s: The specified target device is not valid\n",
205 ch->id);
206 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
207 break;
208 default:
209 pr_err("An I/O operation resulted in error %04x\n",
210 rc);
211 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
212 }
213}
214
215void ctcm_purge_skb_queue(struct sk_buff_head *q)
216{
217 struct sk_buff *skb;
218
219 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
220
221 while ((skb = skb_dequeue(q))) {
222 atomic_dec(&skb->users);
223 dev_kfree_skb_any(skb);
224 }
225}
226
227/**
228 * NOP action for statemachines
229 */
230static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
231{
232}
233
234/*
235 * Actions for channel - statemachines.
236 */
237
238/**
239 * Normal data has been send. Free the corresponding
240 * skb (it's in io_queue), reset dev->tbusy and
241 * revert to idle state.
242 *
243 * fi An instance of a channel statemachine.
244 * event The event, just happened.
245 * arg Generic pointer, casted from channel * upon call.
246 */
247static void chx_txdone(fsm_instance *fi, int event, void *arg)
248{
249 struct channel *ch = arg;
250 struct net_device *dev = ch->netdev;
251 struct ctcm_priv *priv = dev->ml_priv;
252 struct sk_buff *skb;
253 int first = 1;
254 int i;
255 unsigned long duration;
256 struct timespec done_stamp = current_kernel_time(); /* xtime */
257
258 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
259
260 duration =
261 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
262 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
263 if (duration > ch->prof.tx_time)
264 ch->prof.tx_time = duration;
265
266 if (ch->irb->scsw.cmd.count != 0)
267 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
268 "%s(%s): TX not complete, remaining %d bytes",
269 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
270 fsm_deltimer(&ch->timer);
271 while ((skb = skb_dequeue(&ch->io_queue))) {
272 priv->stats.tx_packets++;
273 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
274 if (first) {
275 priv->stats.tx_bytes += 2;
276 first = 0;
277 }
278 atomic_dec(&skb->users);
279 dev_kfree_skb_irq(skb);
280 }
281 spin_lock(&ch->collect_lock);
282 clear_normalized_cda(&ch->ccw[4]);
283 if (ch->collect_len > 0) {
284 int rc;
285
286 if (ctcm_checkalloc_buffer(ch)) {
287 spin_unlock(&ch->collect_lock);
288 return;
289 }
290 ch->trans_skb->data = ch->trans_skb_data;
291 skb_reset_tail_pointer(ch->trans_skb);
292 ch->trans_skb->len = 0;
293 if (ch->prof.maxmulti < (ch->collect_len + 2))
294 ch->prof.maxmulti = ch->collect_len + 2;
295 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
296 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
297 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
298 i = 0;
299 while ((skb = skb_dequeue(&ch->collect_queue))) {
300 skb_copy_from_linear_data(skb,
301 skb_put(ch->trans_skb, skb->len), skb->len);
302 priv->stats.tx_packets++;
303 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
304 atomic_dec(&skb->users);
305 dev_kfree_skb_irq(skb);
306 i++;
307 }
308 ch->collect_len = 0;
309 spin_unlock(&ch->collect_lock);
310 ch->ccw[1].count = ch->trans_skb->len;
311 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
312 ch->prof.send_stamp = current_kernel_time(); /* xtime */
313 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
314 (unsigned long)ch, 0xff, 0);
315 ch->prof.doios_multi++;
316 if (rc != 0) {
317 priv->stats.tx_dropped += i;
318 priv->stats.tx_errors += i;
319 fsm_deltimer(&ch->timer);
320 ctcm_ccw_check_rc(ch, rc, "chained TX");
321 }
322 } else {
323 spin_unlock(&ch->collect_lock);
324 fsm_newstate(fi, CTC_STATE_TXIDLE);
325 }
326 ctcm_clear_busy_do(dev);
327}
328
329/**
330 * Initial data is sent.
331 * Notify device statemachine that we are up and
332 * running.
333 *
334 * fi An instance of a channel statemachine.
335 * event The event, just happened.
336 * arg Generic pointer, casted from channel * upon call.
337 */
338void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
339{
340 struct channel *ch = arg;
341 struct net_device *dev = ch->netdev;
342 struct ctcm_priv *priv = dev->ml_priv;
343
344 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
345
346 fsm_deltimer(&ch->timer);
347 fsm_newstate(fi, CTC_STATE_TXIDLE);
348 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
349}
350
351/**
352 * Got normal data, check for sanity, queue it up, allocate new buffer
353 * trigger bottom half, and initiate next read.
354 *
355 * fi An instance of a channel statemachine.
356 * event The event, just happened.
357 * arg Generic pointer, casted from channel * upon call.
358 */
359static void chx_rx(fsm_instance *fi, int event, void *arg)
360{
361 struct channel *ch = arg;
362 struct net_device *dev = ch->netdev;
363 struct ctcm_priv *priv = dev->ml_priv;
364 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
365 struct sk_buff *skb = ch->trans_skb;
366 __u16 block_len = *((__u16 *)skb->data);
367 int check_len;
368 int rc;
369
370 fsm_deltimer(&ch->timer);
371 if (len < 8) {
372 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
373 "%s(%s): got packet with length %d < 8\n",
374 CTCM_FUNTAIL, dev->name, len);
375 priv->stats.rx_dropped++;
376 priv->stats.rx_length_errors++;
377 goto again;
378 }
379 if (len > ch->max_bufsize) {
380 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
381 "%s(%s): got packet with length %d > %d\n",
382 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
383 priv->stats.rx_dropped++;
384 priv->stats.rx_length_errors++;
385 goto again;
386 }
387
388 /*
389 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
390 */
391 switch (ch->protocol) {
392 case CTCM_PROTO_S390:
393 case CTCM_PROTO_OS390:
394 check_len = block_len + 2;
395 break;
396 default:
397 check_len = block_len;
398 break;
399 }
400 if ((len < block_len) || (len > check_len)) {
401 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
402 "%s(%s): got block length %d != rx length %d\n",
403 CTCM_FUNTAIL, dev->name, block_len, len);
404 if (do_debug)
405 ctcmpc_dump_skb(skb, 0);
406
407 *((__u16 *)skb->data) = len;
408 priv->stats.rx_dropped++;
409 priv->stats.rx_length_errors++;
410 goto again;
411 }
412 if (block_len > 2) {
413 *((__u16 *)skb->data) = block_len - 2;
414 ctcm_unpack_skb(ch, skb);
415 }
416 again:
417 skb->data = ch->trans_skb_data;
418 skb_reset_tail_pointer(skb);
419 skb->len = 0;
420 if (ctcm_checkalloc_buffer(ch))
421 return;
422 ch->ccw[1].count = ch->max_bufsize;
423 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
424 (unsigned long)ch, 0xff, 0);
425 if (rc != 0)
426 ctcm_ccw_check_rc(ch, rc, "normal RX");
427}
428
429/**
430 * Initialize connection by sending a __u16 of value 0.
431 *
432 * fi An instance of a channel statemachine.
433 * event The event, just happened.
434 * arg Generic pointer, casted from channel * upon call.
435 */
436static void chx_firstio(fsm_instance *fi, int event, void *arg)
437{
438 int rc;
439 struct channel *ch = arg;
440 int fsmstate = fsm_getstate(fi);
441
442 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
443 "%s(%s) : %02x",
444 CTCM_FUNTAIL, ch->id, fsmstate);
445
446 ch->sense_rc = 0; /* reset unit check report control */
447 if (fsmstate == CTC_STATE_TXIDLE)
448 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
449 "%s(%s): remote side issued READ?, init.\n",
450 CTCM_FUNTAIL, ch->id);
451 fsm_deltimer(&ch->timer);
452 if (ctcm_checkalloc_buffer(ch))
453 return;
454 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
455 (ch->protocol == CTCM_PROTO_OS390)) {
456 /* OS/390 resp. z/OS */
457 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
458 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
459 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
460 CTC_EVENT_TIMER, ch);
461 chx_rxidle(fi, event, arg);
462 } else {
463 struct net_device *dev = ch->netdev;
464 struct ctcm_priv *priv = dev->ml_priv;
465 fsm_newstate(fi, CTC_STATE_TXIDLE);
466 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
467 }
468 return;
469 }
470 /*
471 * Don't setup a timer for receiving the initial RX frame
472 * if in compatibility mode, since VM TCP delays the initial
473 * frame until it has some data to send.
474 */
475 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
476 (ch->protocol != CTCM_PROTO_S390))
477 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
478
479 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
480 ch->ccw[1].count = 2; /* Transfer only length */
481
482 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
483 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
484 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
485 (unsigned long)ch, 0xff, 0);
486 if (rc != 0) {
487 fsm_deltimer(&ch->timer);
488 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
489 ctcm_ccw_check_rc(ch, rc, "init IO");
490 }
491 /*
492 * If in compatibility mode since we don't setup a timer, we
493 * also signal RX channel up immediately. This enables us
494 * to send packets early which in turn usually triggers some
495 * reply from VM TCP which brings up the RX channel to it's
496 * final state.
497 */
498 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
499 (ch->protocol == CTCM_PROTO_S390)) {
500 struct net_device *dev = ch->netdev;
501 struct ctcm_priv *priv = dev->ml_priv;
502 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
503 }
504}
505
506/**
507 * Got initial data, check it. If OK,
508 * notify device statemachine that we are up and
509 * running.
510 *
511 * fi An instance of a channel statemachine.
512 * event The event, just happened.
513 * arg Generic pointer, casted from channel * upon call.
514 */
515static void chx_rxidle(fsm_instance *fi, int event, void *arg)
516{
517 struct channel *ch = arg;
518 struct net_device *dev = ch->netdev;
519 struct ctcm_priv *priv = dev->ml_priv;
520 __u16 buflen;
521 int rc;
522
523 fsm_deltimer(&ch->timer);
524 buflen = *((__u16 *)ch->trans_skb->data);
525 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
526 __func__, dev->name, buflen);
527
528 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
529 if (ctcm_checkalloc_buffer(ch))
530 return;
531 ch->ccw[1].count = ch->max_bufsize;
532 fsm_newstate(fi, CTC_STATE_RXIDLE);
533 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
534 (unsigned long)ch, 0xff, 0);
535 if (rc != 0) {
536 fsm_newstate(fi, CTC_STATE_RXINIT);
537 ctcm_ccw_check_rc(ch, rc, "initial RX");
538 } else
539 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
540 } else {
541 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
542 __func__, dev->name,
543 buflen, CTCM_INITIAL_BLOCKLEN);
544 chx_firstio(fi, event, arg);
545 }
546}
547
548/**
549 * Set channel into extended mode.
550 *
551 * fi An instance of a channel statemachine.
552 * event The event, just happened.
553 * arg Generic pointer, casted from channel * upon call.
554 */
555static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
556{
557 struct channel *ch = arg;
558 int rc;
559 unsigned long saveflags = 0;
560 int timeout = CTCM_TIME_5_SEC;
561
562 fsm_deltimer(&ch->timer);
563 if (IS_MPC(ch)) {
564 timeout = 1500;
565 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
566 __func__, smp_processor_id(), ch, ch->id);
567 }
568 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
569 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
570 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
571
572 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
573 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
574 /* Such conditional locking is undeterministic in
575 * static view. => ignore sparse warnings here. */
576
577 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
578 (unsigned long)ch, 0xff, 0);
579 if (event == CTC_EVENT_TIMER) /* see above comments */
580 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
581 if (rc != 0) {
582 fsm_deltimer(&ch->timer);
583 fsm_newstate(fi, CTC_STATE_STARTWAIT);
584 ctcm_ccw_check_rc(ch, rc, "set Mode");
585 } else
586 ch->retry = 0;
587}
588
589/**
590 * Setup channel.
591 *
592 * fi An instance of a channel statemachine.
593 * event The event, just happened.
594 * arg Generic pointer, casted from channel * upon call.
595 */
596static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
597{
598 struct channel *ch = arg;
599 unsigned long saveflags;
600 int rc;
601
602 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
603 CTCM_FUNTAIL, ch->id,
604 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
605
606 if (ch->trans_skb != NULL) {
607 clear_normalized_cda(&ch->ccw[1]);
608 dev_kfree_skb(ch->trans_skb);
609 ch->trans_skb = NULL;
610 }
611 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
612 ch->ccw[1].cmd_code = CCW_CMD_READ;
613 ch->ccw[1].flags = CCW_FLAG_SLI;
614 ch->ccw[1].count = 0;
615 } else {
616 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
617 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
618 ch->ccw[1].count = 0;
619 }
620 if (ctcm_checkalloc_buffer(ch)) {
621 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
622 "%s(%s): %s trans_skb alloc delayed "
623 "until first transfer",
624 CTCM_FUNTAIL, ch->id,
625 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
626 "RX" : "TX");
627 }
628 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
629 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
630 ch->ccw[0].count = 0;
631 ch->ccw[0].cda = 0;
632 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
633 ch->ccw[2].flags = CCW_FLAG_SLI;
634 ch->ccw[2].count = 0;
635 ch->ccw[2].cda = 0;
636 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
637 ch->ccw[4].cda = 0;
638 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
639
640 fsm_newstate(fi, CTC_STATE_STARTWAIT);
641 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
642 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
643 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
644 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
645 if (rc != 0) {
646 if (rc != -EBUSY)
647 fsm_deltimer(&ch->timer);
648 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
649 }
650}
651
652/**
653 * Shutdown a channel.
654 *
655 * fi An instance of a channel statemachine.
656 * event The event, just happened.
657 * arg Generic pointer, casted from channel * upon call.
658 */
659static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
660{
661 struct channel *ch = arg;
662 unsigned long saveflags = 0;
663 int rc;
664 int oldstate;
665
666 fsm_deltimer(&ch->timer);
667 if (IS_MPC(ch))
668 fsm_deltimer(&ch->sweep_timer);
669
670 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
671
672 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
673 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
674 /* Such conditional locking is undeterministic in
675 * static view. => ignore sparse warnings here. */
676 oldstate = fsm_getstate(fi);
677 fsm_newstate(fi, CTC_STATE_TERM);
678 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
679
680 if (event == CTC_EVENT_STOP)
681 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
682 /* see remark above about conditional locking */
683
684 if (rc != 0 && rc != -EBUSY) {
685 fsm_deltimer(&ch->timer);
686 if (event != CTC_EVENT_STOP) {
687 fsm_newstate(fi, oldstate);
688 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
689 }
690 }
691}
692
693/**
694 * Cleanup helper for chx_fail and chx_stopped
695 * cleanup channels queue and notify interface statemachine.
696 *
697 * fi An instance of a channel statemachine.
698 * state The next state (depending on caller).
699 * ch The channel to operate on.
700 */
701static void ctcm_chx_cleanup(fsm_instance *fi, int state,
702 struct channel *ch)
703{
704 struct net_device *dev = ch->netdev;
705 struct ctcm_priv *priv = dev->ml_priv;
706
707 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
708 "%s(%s): %s[%d]\n",
709 CTCM_FUNTAIL, dev->name, ch->id, state);
710
711 fsm_deltimer(&ch->timer);
712 if (IS_MPC(ch))
713 fsm_deltimer(&ch->sweep_timer);
714
715 fsm_newstate(fi, state);
716 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
717 clear_normalized_cda(&ch->ccw[1]);
718 dev_kfree_skb_any(ch->trans_skb);
719 ch->trans_skb = NULL;
720 }
721
722 ch->th_seg = 0x00;
723 ch->th_seq_num = 0x00;
724 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
725 skb_queue_purge(&ch->io_queue);
726 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
727 } else {
728 ctcm_purge_skb_queue(&ch->io_queue);
729 if (IS_MPC(ch))
730 ctcm_purge_skb_queue(&ch->sweep_queue);
731 spin_lock(&ch->collect_lock);
732 ctcm_purge_skb_queue(&ch->collect_queue);
733 ch->collect_len = 0;
734 spin_unlock(&ch->collect_lock);
735 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
736 }
737}
738
739/**
740 * A channel has successfully been halted.
741 * Cleanup it's queue and notify interface statemachine.
742 *
743 * fi An instance of a channel statemachine.
744 * event The event, just happened.
745 * arg Generic pointer, casted from channel * upon call.
746 */
747static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
748{
749 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
750}
751
752/**
753 * A stop command from device statemachine arrived and we are in
754 * not operational mode. Set state to stopped.
755 *
756 * fi An instance of a channel statemachine.
757 * event The event, just happened.
758 * arg Generic pointer, casted from channel * upon call.
759 */
760static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
761{
762 fsm_newstate(fi, CTC_STATE_STOPPED);
763}
764
765/**
766 * A machine check for no path, not operational status or gone device has
767 * happened.
768 * Cleanup queue and notify interface statemachine.
769 *
770 * fi An instance of a channel statemachine.
771 * event The event, just happened.
772 * arg Generic pointer, casted from channel * upon call.
773 */
774static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
775{
776 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
777}
778
779/**
780 * Handle error during setup of channel.
781 *
782 * fi An instance of a channel statemachine.
783 * event The event, just happened.
784 * arg Generic pointer, casted from channel * upon call.
785 */
786static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
787{
788 struct channel *ch = arg;
789 struct net_device *dev = ch->netdev;
790 struct ctcm_priv *priv = dev->ml_priv;
791
792 /*
793 * Special case: Got UC_RCRESET on setmode.
794 * This means that remote side isn't setup. In this case
795 * simply retry after some 10 secs...
796 */
797 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
798 ((event == CTC_EVENT_UC_RCRESET) ||
799 (event == CTC_EVENT_UC_RSRESET))) {
800 fsm_newstate(fi, CTC_STATE_STARTRETRY);
801 fsm_deltimer(&ch->timer);
802 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
803 if (!IS_MPC(ch) &&
804 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
805 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
806 if (rc != 0)
807 ctcm_ccw_check_rc(ch, rc,
808 "HaltIO in chx_setuperr");
809 }
810 return;
811 }
812
813 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
814 "%s(%s) : %s error during %s channel setup state=%s\n",
815 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
816 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
817 fsm_getstate_str(fi));
818
819 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
820 fsm_newstate(fi, CTC_STATE_RXERR);
821 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
822 } else {
823 fsm_newstate(fi, CTC_STATE_TXERR);
824 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
825 }
826}
827
828/**
829 * Restart a channel after an error.
830 *
831 * fi An instance of a channel statemachine.
832 * event The event, just happened.
833 * arg Generic pointer, casted from channel * upon call.
834 */
835static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
836{
837 struct channel *ch = arg;
838 struct net_device *dev = ch->netdev;
839 unsigned long saveflags = 0;
840 int oldstate;
841 int rc;
842
843 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
844 "%s: %s[%d] of %s\n",
845 CTCM_FUNTAIL, ch->id, event, dev->name);
846
847 fsm_deltimer(&ch->timer);
848
849 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
850 oldstate = fsm_getstate(fi);
851 fsm_newstate(fi, CTC_STATE_STARTWAIT);
852 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
853 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
854 /* Such conditional locking is a known problem for
855 * sparse because its undeterministic in static view.
856 * Warnings should be ignored here. */
857 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
858 if (event == CTC_EVENT_TIMER)
859 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
860 if (rc != 0) {
861 if (rc != -EBUSY) {
862 fsm_deltimer(&ch->timer);
863 fsm_newstate(fi, oldstate);
864 }
865 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
866 }
867}
868
869/**
870 * Handle error during RX initial handshake (exchange of
871 * 0-length block header)
872 *
873 * fi An instance of a channel statemachine.
874 * event The event, just happened.
875 * arg Generic pointer, casted from channel * upon call.
876 */
877static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
878{
879 struct channel *ch = arg;
880 struct net_device *dev = ch->netdev;
881 struct ctcm_priv *priv = dev->ml_priv;
882
883 if (event == CTC_EVENT_TIMER) {
884 if (!IS_MPCDEV(dev))
885 /* TODO : check if MPC deletes timer somewhere */
886 fsm_deltimer(&ch->timer);
887 if (ch->retry++ < 3)
888 ctcm_chx_restart(fi, event, arg);
889 else {
890 fsm_newstate(fi, CTC_STATE_RXERR);
891 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
892 }
893 } else {
894 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
895 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
896 ctc_ch_event_names[event], fsm_getstate_str(fi));
897
898 dev_warn(&dev->dev,
899 "Initialization failed with RX/TX init handshake "
900 "error %s\n", ctc_ch_event_names[event]);
901 }
902}
903
904/**
905 * Notify device statemachine if we gave up initialization
906 * of RX channel.
907 *
908 * fi An instance of a channel statemachine.
909 * event The event, just happened.
910 * arg Generic pointer, casted from channel * upon call.
911 */
912static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
913{
914 struct channel *ch = arg;
915 struct net_device *dev = ch->netdev;
916 struct ctcm_priv *priv = dev->ml_priv;
917
918 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
919 "%s(%s): RX %s busy, init. fail",
920 CTCM_FUNTAIL, dev->name, ch->id);
921 fsm_newstate(fi, CTC_STATE_RXERR);
922 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
923}
924
925/**
926 * Handle RX Unit check remote reset (remote disconnected)
927 *
928 * fi An instance of a channel statemachine.
929 * event The event, just happened.
930 * arg Generic pointer, casted from channel * upon call.
931 */
932static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
933{
934 struct channel *ch = arg;
935 struct channel *ch2;
936 struct net_device *dev = ch->netdev;
937 struct ctcm_priv *priv = dev->ml_priv;
938
939 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
940 "%s: %s: remote disconnect - re-init ...",
941 CTCM_FUNTAIL, dev->name);
942 fsm_deltimer(&ch->timer);
943 /*
944 * Notify device statemachine
945 */
946 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
947 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
948
949 fsm_newstate(fi, CTC_STATE_DTERM);
950 ch2 = priv->channel[CTCM_WRITE];
951 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
952
953 ccw_device_halt(ch->cdev, (unsigned long)ch);
954 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
955}
956
957/**
958 * Handle error during TX channel initialization.
959 *
960 * fi An instance of a channel statemachine.
961 * event The event, just happened.
962 * arg Generic pointer, casted from channel * upon call.
963 */
964static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
965{
966 struct channel *ch = arg;
967 struct net_device *dev = ch->netdev;
968 struct ctcm_priv *priv = dev->ml_priv;
969
970 if (event == CTC_EVENT_TIMER) {
971 fsm_deltimer(&ch->timer);
972 if (ch->retry++ < 3)
973 ctcm_chx_restart(fi, event, arg);
974 else {
975 fsm_newstate(fi, CTC_STATE_TXERR);
976 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
977 }
978 } else {
979 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
980 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
981 ctc_ch_event_names[event], fsm_getstate_str(fi));
982
983 dev_warn(&dev->dev,
984 "Initialization failed with RX/TX init handshake "
985 "error %s\n", ctc_ch_event_names[event]);
986 }
987}
988
989/**
990 * Handle TX timeout by retrying operation.
991 *
992 * fi An instance of a channel statemachine.
993 * event The event, just happened.
994 * arg Generic pointer, casted from channel * upon call.
995 */
996static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
997{
998 struct channel *ch = arg;
999 struct net_device *dev = ch->netdev;
1000 struct ctcm_priv *priv = dev->ml_priv;
1001 struct sk_buff *skb;
1002
1003 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1004 __func__, smp_processor_id(), ch, ch->id);
1005
1006 fsm_deltimer(&ch->timer);
1007 if (ch->retry++ > 3) {
1008 struct mpc_group *gptr = priv->mpcg;
1009 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1010 "%s: %s: retries exceeded",
1011 CTCM_FUNTAIL, ch->id);
1012 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1013 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1014 use gptr as mpc indicator */
1015 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1016 ctcm_chx_restart(fi, event, arg);
1017 goto done;
1018 }
1019
1020 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1021 "%s : %s: retry %d",
1022 CTCM_FUNTAIL, ch->id, ch->retry);
1023 skb = skb_peek(&ch->io_queue);
1024 if (skb) {
1025 int rc = 0;
1026 unsigned long saveflags = 0;
1027 clear_normalized_cda(&ch->ccw[4]);
1028 ch->ccw[4].count = skb->len;
1029 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1030 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1031 "%s: %s: IDAL alloc failed",
1032 CTCM_FUNTAIL, ch->id);
1033 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1034 ctcm_chx_restart(fi, event, arg);
1035 goto done;
1036 }
1037 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1038 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1039 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1040 /* Such conditional locking is a known problem for
1041 * sparse because its undeterministic in static view.
1042 * Warnings should be ignored here. */
1043 if (do_debug_ccw)
1044 ctcmpc_dumpit((char *)&ch->ccw[3],
1045 sizeof(struct ccw1) * 3);
1046
1047 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1048 (unsigned long)ch, 0xff, 0);
1049 if (event == CTC_EVENT_TIMER)
1050 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1051 saveflags);
1052 if (rc != 0) {
1053 fsm_deltimer(&ch->timer);
1054 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1055 ctcm_purge_skb_queue(&ch->io_queue);
1056 }
1057 }
1058done:
1059 return;
1060}
1061
1062/**
1063 * Handle fatal errors during an I/O command.
1064 *
1065 * fi An instance of a channel statemachine.
1066 * event The event, just happened.
1067 * arg Generic pointer, casted from channel * upon call.
1068 */
1069static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1070{
1071 struct channel *ch = arg;
1072 struct net_device *dev = ch->netdev;
1073 struct ctcm_priv *priv = dev->ml_priv;
1074 int rd = CHANNEL_DIRECTION(ch->flags);
1075
1076 fsm_deltimer(&ch->timer);
1077 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1078 "%s: %s: %s unrecoverable channel error",
1079 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1080
1081 if (IS_MPC(ch)) {
1082 priv->stats.tx_dropped++;
1083 priv->stats.tx_errors++;
1084 }
1085 if (rd == CTCM_READ) {
1086 fsm_newstate(fi, CTC_STATE_RXERR);
1087 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1088 } else {
1089 fsm_newstate(fi, CTC_STATE_TXERR);
1090 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1091 }
1092}
1093
1094/*
1095 * The ctcm statemachine for a channel.
1096 */
1097const fsm_node ch_fsm[] = {
1098 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1099 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1100 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1101 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1102
1103 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1104 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1105 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1106 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1107 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1108
1109 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1110 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1111 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1112 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1113 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1114 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1115
1116 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1117 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1118 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1119 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1120
1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1126 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1127 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1128 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1129
1130 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1131 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1132 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1133 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1134 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1135 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1136 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1137 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1138 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1139 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1140
1141 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1142 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1143 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1144 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1145 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1146 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1147 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1148
1149 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1150 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1151 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1152 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1153 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1154 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1155 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1156 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1157
1158 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1159 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1160 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1161 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1162 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1163 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1164 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1165
1166 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1167 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1168 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1169 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1170 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1171 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1172
1173 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1174 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1175 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1176 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1177 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1178 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1179
1180 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1181 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1182 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1183 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1184 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1185 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1186 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1187 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1188
1189 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1190 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1191 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1192 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1193};
1194
1195int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1196
1197/*
1198 * MPC actions for mpc channel statemachine
1199 * handling of MPC protocol requires extra
1200 * statemachine and actions which are prefixed ctcmpc_ .
1201 * The ctc_ch_states and ctc_ch_state_names,
1202 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1203 * which are expanded by some elements.
1204 */
1205
1206/*
1207 * Actions for mpc channel statemachine.
1208 */
1209
1210/**
1211 * Normal data has been send. Free the corresponding
1212 * skb (it's in io_queue), reset dev->tbusy and
1213 * revert to idle state.
1214 *
1215 * fi An instance of a channel statemachine.
1216 * event The event, just happened.
1217 * arg Generic pointer, casted from channel * upon call.
1218 */
1219static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1220{
1221 struct channel *ch = arg;
1222 struct net_device *dev = ch->netdev;
1223 struct ctcm_priv *priv = dev->ml_priv;
1224 struct mpc_group *grp = priv->mpcg;
1225 struct sk_buff *skb;
1226 int first = 1;
1227 int i;
1228 __u32 data_space;
1229 unsigned long duration;
1230 struct sk_buff *peekskb;
1231 int rc;
1232 struct th_header *header;
1233 struct pdu *p_header;
1234 struct timespec done_stamp = current_kernel_time(); /* xtime */
1235
1236 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1237 __func__, dev->name, smp_processor_id());
1238
1239 duration =
1240 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1241 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1242 if (duration > ch->prof.tx_time)
1243 ch->prof.tx_time = duration;
1244
1245 if (ch->irb->scsw.cmd.count != 0)
1246 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1247 "%s(%s): TX not complete, remaining %d bytes",
1248 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1249 fsm_deltimer(&ch->timer);
1250 while ((skb = skb_dequeue(&ch->io_queue))) {
1251 priv->stats.tx_packets++;
1252 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1253 if (first) {
1254 priv->stats.tx_bytes += 2;
1255 first = 0;
1256 }
1257 atomic_dec(&skb->users);
1258 dev_kfree_skb_irq(skb);
1259 }
1260 spin_lock(&ch->collect_lock);
1261 clear_normalized_cda(&ch->ccw[4]);
1262 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1263 spin_unlock(&ch->collect_lock);
1264 fsm_newstate(fi, CTC_STATE_TXIDLE);
1265 goto done;
1266 }
1267
1268 if (ctcm_checkalloc_buffer(ch)) {
1269 spin_unlock(&ch->collect_lock);
1270 goto done;
1271 }
1272 ch->trans_skb->data = ch->trans_skb_data;
1273 skb_reset_tail_pointer(ch->trans_skb);
1274 ch->trans_skb->len = 0;
1275 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1276 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1277 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1278 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1279 i = 0;
1280 p_header = NULL;
1281 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1282
1283 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1284 " data_space:%04x\n",
1285 __func__, data_space);
1286
1287 while ((skb = skb_dequeue(&ch->collect_queue))) {
1288 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1289 p_header = (struct pdu *)
1290 (skb_tail_pointer(ch->trans_skb) - skb->len);
1291 p_header->pdu_flag = 0x00;
1292 if (skb->protocol == ntohs(ETH_P_SNAP))
1293 p_header->pdu_flag |= 0x60;
1294 else
1295 p_header->pdu_flag |= 0x20;
1296
1297 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1298 __func__, ch->trans_skb->len);
1299 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1300 " to 32 bytes sent to vtam\n", __func__);
1301 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1302
1303 ch->collect_len -= skb->len;
1304 data_space -= skb->len;
1305 priv->stats.tx_packets++;
1306 priv->stats.tx_bytes += skb->len;
1307 atomic_dec(&skb->users);
1308 dev_kfree_skb_any(skb);
1309 peekskb = skb_peek(&ch->collect_queue);
1310 if (peekskb->len > data_space)
1311 break;
1312 i++;
1313 }
1314 /* p_header points to the last one we handled */
1315 if (p_header)
1316 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1317 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1318 if (!header) {
1319 spin_unlock(&ch->collect_lock);
1320 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1321 goto done;
1322 }
1323 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1324 ch->th_seq_num++;
1325 header->th_seq_num = ch->th_seq_num;
1326
1327 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1328 __func__, ch->th_seq_num);
1329
1330 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1331 TH_HEADER_LENGTH); /* put the TH on the packet */
1332
1333 kfree(header);
1334
1335 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1336 __func__, ch->trans_skb->len);
1337 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1338 "data to vtam from collect_q\n", __func__);
1339 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1340 min_t(int, ch->trans_skb->len, 50));
1341
1342 spin_unlock(&ch->collect_lock);
1343 clear_normalized_cda(&ch->ccw[1]);
1344 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1345 dev_kfree_skb_any(ch->trans_skb);
1346 ch->trans_skb = NULL;
1347 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1348 "%s: %s: IDAL alloc failed",
1349 CTCM_FUNTAIL, ch->id);
1350 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1351 return;
1352 }
1353 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 = current_kernel_time(); /* xtime */
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],
1359 (unsigned long)ch, 0xff, 0);
1360 ch->prof.doios_multi++;
1361 if (rc != 0) {
1362 priv->stats.tx_dropped += i;
1363 priv->stats.tx_errors += i;
1364 fsm_deltimer(&ch->timer);
1365 ctcm_ccw_check_rc(ch, rc, "chained TX");
1366 }
1367done:
1368 ctcm_clear_busy(dev);
1369 return;
1370}
1371
1372/**
1373 * Got normal data, check for sanity, queue it up, allocate new buffer
1374 * trigger bottom half, and initiate next read.
1375 *
1376 * fi An instance of a channel statemachine.
1377 * event The event, just happened.
1378 * arg Generic pointer, casted from channel * upon call.
1379 */
1380static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1381{
1382 struct channel *ch = arg;
1383 struct net_device *dev = ch->netdev;
1384 struct ctcm_priv *priv = dev->ml_priv;
1385 struct mpc_group *grp = priv->mpcg;
1386 struct sk_buff *skb = ch->trans_skb;
1387 struct sk_buff *new_skb;
1388 unsigned long saveflags = 0; /* avoids compiler warning */
1389 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1390
1391 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1392 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1393 ch->id, ch->max_bufsize, len);
1394 fsm_deltimer(&ch->timer);
1395
1396 if (skb == NULL) {
1397 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1398 "%s(%s): TRANS_SKB = NULL",
1399 CTCM_FUNTAIL, dev->name);
1400 goto again;
1401 }
1402
1403 if (len < TH_HEADER_LENGTH) {
1404 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1405 "%s(%s): packet length %d to short",
1406 CTCM_FUNTAIL, dev->name, len);
1407 priv->stats.rx_dropped++;
1408 priv->stats.rx_length_errors++;
1409 } else {
1410 /* must have valid th header or game over */
1411 __u32 block_len = len;
1412 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1413 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1414
1415 if (new_skb == NULL) {
1416 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1417 "%s(%d): skb allocation failed",
1418 CTCM_FUNTAIL, dev->name);
1419 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1420 goto again;
1421 }
1422 switch (fsm_getstate(grp->fsm)) {
1423 case MPCG_STATE_RESET:
1424 case MPCG_STATE_INOP:
1425 dev_kfree_skb_any(new_skb);
1426 break;
1427 case MPCG_STATE_FLOWC:
1428 case MPCG_STATE_READY:
1429 memcpy(skb_put(new_skb, block_len),
1430 skb->data, block_len);
1431 skb_queue_tail(&ch->io_queue, new_skb);
1432 tasklet_schedule(&ch->ch_tasklet);
1433 break;
1434 default:
1435 memcpy(skb_put(new_skb, len), skb->data, len);
1436 skb_queue_tail(&ch->io_queue, new_skb);
1437 tasklet_hi_schedule(&ch->ch_tasklet);
1438 break;
1439 }
1440 }
1441
1442again:
1443 switch (fsm_getstate(grp->fsm)) {
1444 int rc, dolock;
1445 case MPCG_STATE_FLOWC:
1446 case MPCG_STATE_READY:
1447 if (ctcm_checkalloc_buffer(ch))
1448 break;
1449 ch->trans_skb->data = ch->trans_skb_data;
1450 skb_reset_tail_pointer(ch->trans_skb);
1451 ch->trans_skb->len = 0;
1452 ch->ccw[1].count = ch->max_bufsize;
1453 if (do_debug_ccw)
1454 ctcmpc_dumpit((char *)&ch->ccw[0],
1455 sizeof(struct ccw1) * 3);
1456 dolock = !in_irq();
1457 if (dolock)
1458 spin_lock_irqsave(
1459 get_ccwdev_lock(ch->cdev), saveflags);
1460 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1461 (unsigned long)ch, 0xff, 0);
1462 if (dolock) /* see remark about conditional locking */
1463 spin_unlock_irqrestore(
1464 get_ccwdev_lock(ch->cdev), saveflags);
1465 if (rc != 0)
1466 ctcm_ccw_check_rc(ch, rc, "normal RX");
1467 default:
1468 break;
1469 }
1470
1471 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1472 __func__, dev->name, ch, ch->id);
1473
1474}
1475
1476/**
1477 * Initialize connection by sending a __u16 of value 0.
1478 *
1479 * fi An instance of a channel statemachine.
1480 * event The event, just happened.
1481 * arg Generic pointer, casted from channel * upon call.
1482 */
1483static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1484{
1485 struct channel *ch = arg;
1486 struct net_device *dev = ch->netdev;
1487 struct ctcm_priv *priv = dev->ml_priv;
1488 struct mpc_group *gptr = priv->mpcg;
1489
1490 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1491 __func__, ch->id, ch);
1492
1493 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1494 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1495 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1496 fsm_getstate(gptr->fsm), ch->protocol);
1497
1498 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1499 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1500
1501 fsm_deltimer(&ch->timer);
1502 if (ctcm_checkalloc_buffer(ch))
1503 goto done;
1504
1505 switch (fsm_getstate(fi)) {
1506 case CTC_STATE_STARTRETRY:
1507 case CTC_STATE_SETUPWAIT:
1508 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1509 ctcmpc_chx_rxidle(fi, event, arg);
1510 } else {
1511 fsm_newstate(fi, CTC_STATE_TXIDLE);
1512 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1513 }
1514 goto done;
1515 default:
1516 break;
1517 };
1518
1519 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1520 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1521
1522done:
1523 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1524 __func__, ch->id, ch);
1525 return;
1526}
1527
1528/**
1529 * Got initial data, check it. If OK,
1530 * notify device statemachine that we are up and
1531 * running.
1532 *
1533 * fi An instance of a channel statemachine.
1534 * event The event, just happened.
1535 * arg Generic pointer, casted from channel * upon call.
1536 */
1537void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1538{
1539 struct channel *ch = arg;
1540 struct net_device *dev = ch->netdev;
1541 struct ctcm_priv *priv = dev->ml_priv;
1542 struct mpc_group *grp = priv->mpcg;
1543 int rc;
1544 unsigned long saveflags = 0; /* avoids compiler warning */
1545
1546 fsm_deltimer(&ch->timer);
1547 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1548 __func__, ch->id, dev->name, smp_processor_id(),
1549 fsm_getstate(fi), fsm_getstate(grp->fsm));
1550
1551 fsm_newstate(fi, CTC_STATE_RXIDLE);
1552 /* XID processing complete */
1553
1554 switch (fsm_getstate(grp->fsm)) {
1555 case MPCG_STATE_FLOWC:
1556 case MPCG_STATE_READY:
1557 if (ctcm_checkalloc_buffer(ch))
1558 goto done;
1559 ch->trans_skb->data = ch->trans_skb_data;
1560 skb_reset_tail_pointer(ch->trans_skb);
1561 ch->trans_skb->len = 0;
1562 ch->ccw[1].count = ch->max_bufsize;
1563 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1564 if (event == CTC_EVENT_START)
1565 /* see remark about conditional locking */
1566 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1567 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1568 (unsigned long)ch, 0xff, 0);
1569 if (event == CTC_EVENT_START)
1570 spin_unlock_irqrestore(
1571 get_ccwdev_lock(ch->cdev), saveflags);
1572 if (rc != 0) {
1573 fsm_newstate(fi, CTC_STATE_RXINIT);
1574 ctcm_ccw_check_rc(ch, rc, "initial RX");
1575 goto done;
1576 }
1577 break;
1578 default:
1579 break;
1580 }
1581
1582 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1583done:
1584 return;
1585}
1586
1587/*
1588 * ctcmpc channel FSM action
1589 * called from several points in ctcmpc_ch_fsm
1590 * ctcmpc only
1591 */
1592static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1593{
1594 struct channel *ch = arg;
1595 struct net_device *dev = ch->netdev;
1596 struct ctcm_priv *priv = dev->ml_priv;
1597 struct mpc_group *grp = priv->mpcg;
1598
1599 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1600 __func__, dev->name, ch->id, ch, smp_processor_id(),
1601 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1602
1603 switch (fsm_getstate(grp->fsm)) {
1604 case MPCG_STATE_XID2INITW:
1605 /* ok..start yside xid exchanges */
1606 if (!ch->in_mpcgroup)
1607 break;
1608 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1609 fsm_deltimer(&grp->timer);
1610 fsm_addtimer(&grp->timer,
1611 MPC_XID_TIMEOUT_VALUE,
1612 MPCG_EVENT_TIMER, dev);
1613 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1614
1615 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1616 /* attn rcvd before xid0 processed via bh */
1617 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1618 break;
1619 case MPCG_STATE_XID2INITX:
1620 case MPCG_STATE_XID0IOWAIT:
1621 case MPCG_STATE_XID0IOWAIX:
1622 /* attn rcvd before xid0 processed on ch
1623 but mid-xid0 processing for group */
1624 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1625 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1626 break;
1627 case MPCG_STATE_XID7INITW:
1628 case MPCG_STATE_XID7INITX:
1629 case MPCG_STATE_XID7INITI:
1630 case MPCG_STATE_XID7INITZ:
1631 switch (fsm_getstate(ch->fsm)) {
1632 case CH_XID7_PENDING:
1633 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1634 break;
1635 case CH_XID7_PENDING2:
1636 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1637 break;
1638 }
1639 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1640 break;
1641 }
1642
1643 return;
1644}
1645
1646/*
1647 * ctcmpc channel FSM action
1648 * called from one point in ctcmpc_ch_fsm
1649 * ctcmpc only
1650 */
1651static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1652{
1653 struct channel *ch = arg;
1654 struct net_device *dev = ch->netdev;
1655 struct ctcm_priv *priv = dev->ml_priv;
1656 struct mpc_group *grp = priv->mpcg;
1657
1658 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1659 __func__, dev->name, ch->id,
1660 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1661
1662 fsm_deltimer(&ch->timer);
1663
1664 switch (fsm_getstate(grp->fsm)) {
1665 case MPCG_STATE_XID0IOWAIT:
1666 /* vtam wants to be primary.start yside xid exchanges*/
1667 /* only receive one attn-busy at a time so must not */
1668 /* change state each time */
1669 grp->changed_side = 1;
1670 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1671 break;
1672 case MPCG_STATE_XID2INITW:
1673 if (grp->changed_side == 1) {
1674 grp->changed_side = 2;
1675 break;
1676 }
1677 /* process began via call to establish_conn */
1678 /* so must report failure instead of reverting */
1679 /* back to ready-for-xid passive state */
1680 if (grp->estconnfunc)
1681 goto done;
1682 /* this attnbusy is NOT the result of xside xid */
1683 /* collisions so yside must have been triggered */
1684 /* by an ATTN that was not intended to start XID */
1685 /* processing. Revert back to ready-for-xid and */
1686 /* wait for ATTN interrupt to signal xid start */
1687 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1688 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1689 fsm_deltimer(&grp->timer);
1690 goto done;
1691 }
1692 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1693 goto done;
1694 case MPCG_STATE_XID2INITX:
1695 /* XID2 was received before ATTN Busy for second
1696 channel.Send yside xid for second channel.
1697 */
1698 if (grp->changed_side == 1) {
1699 grp->changed_side = 2;
1700 break;
1701 }
1702 case MPCG_STATE_XID0IOWAIX:
1703 case MPCG_STATE_XID7INITW:
1704 case MPCG_STATE_XID7INITX:
1705 case MPCG_STATE_XID7INITI:
1706 case MPCG_STATE_XID7INITZ:
1707 default:
1708 /* multiple attn-busy indicates too out-of-sync */
1709 /* and they are certainly not being received as part */
1710 /* of valid mpc group negotiations.. */
1711 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1712 goto done;
1713 }
1714
1715 if (grp->changed_side == 1) {
1716 fsm_deltimer(&grp->timer);
1717 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1718 MPCG_EVENT_TIMER, dev);
1719 }
1720 if (ch->in_mpcgroup)
1721 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1722 else
1723 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1724 "%s(%s): channel %s not added to group",
1725 CTCM_FUNTAIL, dev->name, ch->id);
1726
1727done:
1728 return;
1729}
1730
1731/*
1732 * ctcmpc channel FSM action
1733 * called from several points in ctcmpc_ch_fsm
1734 * ctcmpc only
1735 */
1736static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1737{
1738 struct channel *ch = arg;
1739 struct net_device *dev = ch->netdev;
1740 struct ctcm_priv *priv = dev->ml_priv;
1741 struct mpc_group *grp = priv->mpcg;
1742
1743 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1744 return;
1745}
1746
1747/*
1748 * ctcmpc channel FSM action
1749 * called from several points in ctcmpc_ch_fsm
1750 * ctcmpc only
1751 */
1752static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1753{
1754 struct channel *ach = arg;
1755 struct net_device *dev = ach->netdev;
1756 struct ctcm_priv *priv = dev->ml_priv;
1757 struct mpc_group *grp = priv->mpcg;
1758 struct channel *wch = priv->channel[CTCM_WRITE];
1759 struct channel *rch = priv->channel[CTCM_READ];
1760 struct sk_buff *skb;
1761 struct th_sweep *header;
1762 int rc = 0;
1763 unsigned long saveflags = 0;
1764
1765 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1766 __func__, smp_processor_id(), ach, ach->id);
1767
1768 if (grp->in_sweep == 0)
1769 goto done;
1770
1771 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1772 __func__, wch->th_seq_num);
1773 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1774 __func__, rch->th_seq_num);
1775
1776 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1777 /* give the previous IO time to complete */
1778 fsm_addtimer(&wch->sweep_timer,
1779 200, CTC_EVENT_RSWEEP_TIMER, wch);
1780 goto done;
1781 }
1782
1783 skb = skb_dequeue(&wch->sweep_queue);
1784 if (!skb)
1785 goto done;
1786
1787 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1788 grp->in_sweep = 0;
1789 ctcm_clear_busy_do(dev);
1790 dev_kfree_skb_any(skb);
1791 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1792 goto done;
1793 } else {
1794 atomic_inc(&skb->users);
1795 skb_queue_tail(&wch->io_queue, skb);
1796 }
1797
1798 /* send out the sweep */
1799 wch->ccw[4].count = skb->len;
1800
1801 header = (struct th_sweep *)skb->data;
1802 switch (header->th.th_ch_flag) {
1803 case TH_SWEEP_REQ:
1804 grp->sweep_req_pend_num--;
1805 break;
1806 case TH_SWEEP_RESP:
1807 grp->sweep_rsp_pend_num--;
1808 break;
1809 }
1810
1811 header->sw.th_last_seq = wch->th_seq_num;
1812
1813 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1814 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1815 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1816
1817 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1818 fsm_newstate(wch->fsm, CTC_STATE_TX);
1819
1820 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1821 wch->prof.send_stamp = current_kernel_time(); /* xtime */
1822 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1823 (unsigned long) wch, 0xff, 0);
1824 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1825
1826 if ((grp->sweep_req_pend_num == 0) &&
1827 (grp->sweep_rsp_pend_num == 0)) {
1828 grp->in_sweep = 0;
1829 rch->th_seq_num = 0x00;
1830 wch->th_seq_num = 0x00;
1831 ctcm_clear_busy_do(dev);
1832 }
1833
1834 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1835 __func__, wch->th_seq_num, rch->th_seq_num);
1836
1837 if (rc != 0)
1838 ctcm_ccw_check_rc(wch, rc, "send sweep");
1839
1840done:
1841 return;
1842}
1843
1844
1845/*
1846 * The ctcmpc statemachine for a channel.
1847 */
1848
1849const fsm_node ctcmpc_ch_fsm[] = {
1850 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1851 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1852 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1853 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1854 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1855
1856 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1857 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1858 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1859 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1860 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1861 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1862 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1863 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1864
1865 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1866 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1867 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1868 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1869 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1870 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1871
1872 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1873 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1874 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1875 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1877
1878 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1879 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1880 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1881 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1882 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1885 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1886
1887 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1888 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1889 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1890 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1891 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1892 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1893 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1894 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1895 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1896 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1897
1898 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1899 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1900 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1901 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1902 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1903 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1904 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1905 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1906 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1907 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1908
1909 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1910 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1911 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1912 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1913 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1914 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1915 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1916 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1917 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1918 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1919 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1920
1921 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1922 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1923 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1924 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1925 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1926 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1927 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1928 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1929 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1930 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1931 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1932 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1933 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1934
1935 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1936 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1937 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1938 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1939 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1940 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1941 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1942 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1943 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1944 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1945 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1946 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1947
1948 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1949 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1950 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1951 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1952 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1953 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1954 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1955 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1956 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1957 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1958 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1959 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1960
1961 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1962 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1963 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1964 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1965 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1966 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1967 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1968 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1969 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1970 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1971 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1972 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1973
1974 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1975 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1976 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1977 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1978 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1979 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1980 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1981 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1982 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1983 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1984 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1985 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1986
1987 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1988 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1989 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1990 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1991 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1992 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1993 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1994 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1995
1996 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1997 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1998 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1999 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2000 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2001 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2002 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2003 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2004 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2005
2006 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2007 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2008 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2009 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2010 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2011 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2012 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2013 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2014
2015 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2016 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2017 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2018 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2019 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2020 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2021 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2022 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2023
2024 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2025 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2026 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2027 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2028 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2029 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2030 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2031
2032 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2033 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2034 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2035 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2036 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2037 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2038 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2039 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2040 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2041 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2042
2043 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2044 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2045 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2046 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2047 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2048};
2049
2050int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2051
2052/*
2053 * Actions for interface - statemachine.
2054 */
2055
2056/**
2057 * Startup channels by sending CTC_EVENT_START to each channel.
2058 *
2059 * fi An instance of an interface statemachine.
2060 * event The event, just happened.
2061 * arg Generic pointer, casted from struct net_device * upon call.
2062 */
2063static void dev_action_start(fsm_instance *fi, int event, void *arg)
2064{
2065 struct net_device *dev = arg;
2066 struct ctcm_priv *priv = dev->ml_priv;
2067 int direction;
2068
2069 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2070
2071 fsm_deltimer(&priv->restart_timer);
2072 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2073 if (IS_MPC(priv))
2074 priv->mpcg->channels_terminating = 0;
2075 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2076 struct channel *ch = priv->channel[direction];
2077 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2078 }
2079}
2080
2081/**
2082 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2083 *
2084 * fi An instance of an interface statemachine.
2085 * event The event, just happened.
2086 * arg Generic pointer, casted from struct net_device * upon call.
2087 */
2088static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2089{
2090 int direction;
2091 struct net_device *dev = arg;
2092 struct ctcm_priv *priv = dev->ml_priv;
2093
2094 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2095
2096 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2097 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2098 struct channel *ch = priv->channel[direction];
2099 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2100 ch->th_seq_num = 0x00;
2101 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2102 __func__, ch->th_seq_num);
2103 }
2104 if (IS_MPC(priv))
2105 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2106}
2107
2108static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2109{
2110 int restart_timer;
2111 struct net_device *dev = arg;
2112 struct ctcm_priv *priv = dev->ml_priv;
2113
2114 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2115
2116 if (IS_MPC(priv)) {
2117 restart_timer = CTCM_TIME_1_SEC;
2118 } else {
2119 restart_timer = CTCM_TIME_5_SEC;
2120 }
2121 dev_info(&dev->dev, "Restarting device\n");
2122
2123 dev_action_stop(fi, event, arg);
2124 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2125 if (IS_MPC(priv))
2126 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2127
2128 /* going back into start sequence too quickly can */
2129 /* result in the other side becoming unreachable due */
2130 /* to sense reported when IO is aborted */
2131 fsm_addtimer(&priv->restart_timer, restart_timer,
2132 DEV_EVENT_START, dev);
2133}
2134
2135/**
2136 * Called from channel statemachine
2137 * when a channel is up and running.
2138 *
2139 * fi An instance of an interface statemachine.
2140 * event The event, just happened.
2141 * arg Generic pointer, casted from struct net_device * upon call.
2142 */
2143static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2144{
2145 struct net_device *dev = arg;
2146 struct ctcm_priv *priv = dev->ml_priv;
2147 int dev_stat = fsm_getstate(fi);
2148
2149 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2150 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2151 dev->name, dev->ml_priv, dev_stat, event);
2152
2153 switch (fsm_getstate(fi)) {
2154 case DEV_STATE_STARTWAIT_RXTX:
2155 if (event == DEV_EVENT_RXUP)
2156 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2157 else
2158 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2159 break;
2160 case DEV_STATE_STARTWAIT_RX:
2161 if (event == DEV_EVENT_RXUP) {
2162 fsm_newstate(fi, DEV_STATE_RUNNING);
2163 dev_info(&dev->dev,
2164 "Connected with remote side\n");
2165 ctcm_clear_busy(dev);
2166 }
2167 break;
2168 case DEV_STATE_STARTWAIT_TX:
2169 if (event == DEV_EVENT_TXUP) {
2170 fsm_newstate(fi, DEV_STATE_RUNNING);
2171 dev_info(&dev->dev,
2172 "Connected with remote side\n");
2173 ctcm_clear_busy(dev);
2174 }
2175 break;
2176 case DEV_STATE_STOPWAIT_TX:
2177 if (event == DEV_EVENT_RXUP)
2178 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2179 break;
2180 case DEV_STATE_STOPWAIT_RX:
2181 if (event == DEV_EVENT_TXUP)
2182 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2183 break;
2184 }
2185
2186 if (IS_MPC(priv)) {
2187 if (event == DEV_EVENT_RXUP)
2188 mpc_channel_action(priv->channel[CTCM_READ],
2189 CTCM_READ, MPC_CHANNEL_ADD);
2190 else
2191 mpc_channel_action(priv->channel[CTCM_WRITE],
2192 CTCM_WRITE, MPC_CHANNEL_ADD);
2193 }
2194}
2195
2196/**
2197 * Called from device statemachine
2198 * when a channel has been shutdown.
2199 *
2200 * fi An instance of an interface statemachine.
2201 * event The event, just happened.
2202 * arg Generic pointer, casted from struct net_device * upon call.
2203 */
2204static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2205{
2206
2207 struct net_device *dev = arg;
2208 struct ctcm_priv *priv = dev->ml_priv;
2209
2210 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2211
2212 switch (fsm_getstate(fi)) {
2213 case DEV_STATE_RUNNING:
2214 if (event == DEV_EVENT_TXDOWN)
2215 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2216 else
2217 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2218 break;
2219 case DEV_STATE_STARTWAIT_RX:
2220 if (event == DEV_EVENT_TXDOWN)
2221 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2222 break;
2223 case DEV_STATE_STARTWAIT_TX:
2224 if (event == DEV_EVENT_RXDOWN)
2225 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2226 break;
2227 case DEV_STATE_STOPWAIT_RXTX:
2228 if (event == DEV_EVENT_TXDOWN)
2229 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2230 else
2231 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2232 break;
2233 case DEV_STATE_STOPWAIT_RX:
2234 if (event == DEV_EVENT_RXDOWN)
2235 fsm_newstate(fi, DEV_STATE_STOPPED);
2236 break;
2237 case DEV_STATE_STOPWAIT_TX:
2238 if (event == DEV_EVENT_TXDOWN)
2239 fsm_newstate(fi, DEV_STATE_STOPPED);
2240 break;
2241 }
2242 if (IS_MPC(priv)) {
2243 if (event == DEV_EVENT_RXDOWN)
2244 mpc_channel_action(priv->channel[CTCM_READ],
2245 CTCM_READ, MPC_CHANNEL_REMOVE);
2246 else
2247 mpc_channel_action(priv->channel[CTCM_WRITE],
2248 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2249 }
2250}
2251
2252const fsm_node dev_fsm[] = {
2253 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2254 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2255 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2256 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2257 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2258 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2259 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2260 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2261 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2262 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2263 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2264 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2265 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2266 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2267 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2268 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2269 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2270 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2271 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2272 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2273 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2274 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2275 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2276 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2277 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2278 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2279 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2280 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2281 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2282 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2283 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2284 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2285 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2286 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2287 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2288 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2289 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2290};
2291
2292int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2293
2294/* --- This is the END my friend --- */
2295
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
51const 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
62const 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
72const 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
103const 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
132static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133
134/*
135 * ----- static ctcm actions for channel statemachine -----
136 *
137*/
138static void chx_txdone(fsm_instance *fi, int event, void *arg);
139static void chx_rx(fsm_instance *fi, int event, void *arg);
140static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141static void chx_firstio(fsm_instance *fi, int event, void *arg);
142static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156
157/*
158 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159 *
160*/
161static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164/* shared :
165static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179*/
180static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183static 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 */
191void 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
214void 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 */
229static 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 */
246static 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 */
334void 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 */
355static 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 */
431static 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 */
509static 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 */
548static 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 */
588static 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 */
651static 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 */
693static 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 */
739static 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 */
752static 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 */
766static 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 */
778static 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 */
827static 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 */
869static 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 */
904static 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 */
924static 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 */
956static 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 */
988static 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 }
1049done:
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 */
1060static 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 */
1088const 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
1186int 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 */
1210static 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
1307 header = skb_push(ch->trans_skb, TH_HEADER_LENGTH);
1308 memset(header, 0, TH_HEADER_LENGTH);
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 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1318 __func__, ch->trans_skb->len);
1319 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1320 "data to vtam from collect_q\n", __func__);
1321 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1322 min_t(int, ch->trans_skb->len, 50));
1323
1324 spin_unlock(&ch->collect_lock);
1325 clear_normalized_cda(&ch->ccw[1]);
1326
1327 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1328 (void *)(unsigned long)ch->ccw[1].cda,
1329 ch->trans_skb->data);
1330 ch->ccw[1].count = ch->max_bufsize;
1331
1332 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1333 dev_kfree_skb_any(ch->trans_skb);
1334 ch->trans_skb = NULL;
1335 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1336 "%s: %s: IDAL alloc failed",
1337 CTCM_FUNTAIL, ch->id);
1338 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1339 return;
1340 }
1341
1342 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1343 (void *)(unsigned long)ch->ccw[1].cda,
1344 ch->trans_skb->data);
1345
1346 ch->ccw[1].count = ch->trans_skb->len;
1347 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1348 ch->prof.send_stamp = jiffies;
1349 if (do_debug_ccw)
1350 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1351 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1352 ch->prof.doios_multi++;
1353 if (rc != 0) {
1354 priv->stats.tx_dropped += i;
1355 priv->stats.tx_errors += i;
1356 fsm_deltimer(&ch->timer);
1357 ctcm_ccw_check_rc(ch, rc, "chained TX");
1358 }
1359done:
1360 ctcm_clear_busy(dev);
1361 return;
1362}
1363
1364/*
1365 * Got normal data, check for sanity, queue it up, allocate new buffer
1366 * trigger bottom half, and initiate next read.
1367 *
1368 * fi An instance of a channel statemachine.
1369 * event The event, just happened.
1370 * arg Generic pointer, casted from channel * upon call.
1371 */
1372static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1373{
1374 struct channel *ch = arg;
1375 struct net_device *dev = ch->netdev;
1376 struct ctcm_priv *priv = dev->ml_priv;
1377 struct mpc_group *grp = priv->mpcg;
1378 struct sk_buff *skb = ch->trans_skb;
1379 struct sk_buff *new_skb;
1380 unsigned long saveflags = 0; /* avoids compiler warning */
1381 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1382
1383 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1384 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1385 ch->id, ch->max_bufsize, len);
1386 fsm_deltimer(&ch->timer);
1387
1388 if (skb == NULL) {
1389 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1390 "%s(%s): TRANS_SKB = NULL",
1391 CTCM_FUNTAIL, dev->name);
1392 goto again;
1393 }
1394
1395 if (len < TH_HEADER_LENGTH) {
1396 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1397 "%s(%s): packet length %d too short",
1398 CTCM_FUNTAIL, dev->name, len);
1399 priv->stats.rx_dropped++;
1400 priv->stats.rx_length_errors++;
1401 } else {
1402 /* must have valid th header or game over */
1403 __u32 block_len = len;
1404 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1405 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1406
1407 if (new_skb == NULL) {
1408 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1409 "%s(%s): skb allocation failed",
1410 CTCM_FUNTAIL, dev->name);
1411 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1412 goto again;
1413 }
1414 switch (fsm_getstate(grp->fsm)) {
1415 case MPCG_STATE_RESET:
1416 case MPCG_STATE_INOP:
1417 dev_kfree_skb_any(new_skb);
1418 break;
1419 case MPCG_STATE_FLOWC:
1420 case MPCG_STATE_READY:
1421 skb_put_data(new_skb, skb->data, block_len);
1422 skb_queue_tail(&ch->io_queue, new_skb);
1423 tasklet_schedule(&ch->ch_tasklet);
1424 break;
1425 default:
1426 skb_put_data(new_skb, skb->data, len);
1427 skb_queue_tail(&ch->io_queue, new_skb);
1428 tasklet_hi_schedule(&ch->ch_tasklet);
1429 break;
1430 }
1431 }
1432
1433again:
1434 switch (fsm_getstate(grp->fsm)) {
1435 int rc, dolock;
1436 case MPCG_STATE_FLOWC:
1437 case MPCG_STATE_READY:
1438 if (ctcm_checkalloc_buffer(ch))
1439 break;
1440 ch->trans_skb->data = ch->trans_skb_data;
1441 skb_reset_tail_pointer(ch->trans_skb);
1442 ch->trans_skb->len = 0;
1443 ch->ccw[1].count = ch->max_bufsize;
1444 if (do_debug_ccw)
1445 ctcmpc_dumpit((char *)&ch->ccw[0],
1446 sizeof(struct ccw1) * 3);
1447 dolock = !in_hardirq();
1448 if (dolock)
1449 spin_lock_irqsave(
1450 get_ccwdev_lock(ch->cdev), saveflags);
1451 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1452 if (dolock) /* see remark about conditional locking */
1453 spin_unlock_irqrestore(
1454 get_ccwdev_lock(ch->cdev), saveflags);
1455 if (rc != 0)
1456 ctcm_ccw_check_rc(ch, rc, "normal RX");
1457 break;
1458 default:
1459 break;
1460 }
1461
1462 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1463 __func__, dev->name, ch, ch->id);
1464
1465}
1466
1467/*
1468 * Initialize connection by sending a __u16 of value 0.
1469 *
1470 * fi An instance of a channel statemachine.
1471 * event The event, just happened.
1472 * arg Generic pointer, casted from channel * upon call.
1473 */
1474static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1475{
1476 struct channel *ch = arg;
1477 struct net_device *dev = ch->netdev;
1478 struct ctcm_priv *priv = dev->ml_priv;
1479 struct mpc_group *gptr = priv->mpcg;
1480
1481 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1482 __func__, ch->id, ch);
1483
1484 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1485 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1486 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1487 fsm_getstate(gptr->fsm), ch->protocol);
1488
1489 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1490 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1491
1492 fsm_deltimer(&ch->timer);
1493 if (ctcm_checkalloc_buffer(ch))
1494 goto done;
1495
1496 switch (fsm_getstate(fi)) {
1497 case CTC_STATE_STARTRETRY:
1498 case CTC_STATE_SETUPWAIT:
1499 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1500 ctcmpc_chx_rxidle(fi, event, arg);
1501 } else {
1502 fsm_newstate(fi, CTC_STATE_TXIDLE);
1503 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1504 }
1505 goto done;
1506 default:
1507 break;
1508 }
1509
1510 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1511 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1512
1513done:
1514 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1515 __func__, ch->id, ch);
1516 return;
1517}
1518
1519/*
1520 * Got initial data, check it. If OK,
1521 * notify device statemachine that we are up and
1522 * running.
1523 *
1524 * fi An instance of a channel statemachine.
1525 * event The event, just happened.
1526 * arg Generic pointer, casted from channel * upon call.
1527 */
1528void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1529{
1530 struct channel *ch = arg;
1531 struct net_device *dev = ch->netdev;
1532 struct ctcm_priv *priv = dev->ml_priv;
1533 struct mpc_group *grp = priv->mpcg;
1534 int rc;
1535 unsigned long saveflags = 0; /* avoids compiler warning */
1536
1537 fsm_deltimer(&ch->timer);
1538 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1539 __func__, ch->id, dev->name, smp_processor_id(),
1540 fsm_getstate(fi), fsm_getstate(grp->fsm));
1541
1542 fsm_newstate(fi, CTC_STATE_RXIDLE);
1543 /* XID processing complete */
1544
1545 switch (fsm_getstate(grp->fsm)) {
1546 case MPCG_STATE_FLOWC:
1547 case MPCG_STATE_READY:
1548 if (ctcm_checkalloc_buffer(ch))
1549 goto done;
1550 ch->trans_skb->data = ch->trans_skb_data;
1551 skb_reset_tail_pointer(ch->trans_skb);
1552 ch->trans_skb->len = 0;
1553 ch->ccw[1].count = ch->max_bufsize;
1554 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1555 if (event == CTC_EVENT_START)
1556 /* see remark about conditional locking */
1557 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1558 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1559 if (event == CTC_EVENT_START)
1560 spin_unlock_irqrestore(
1561 get_ccwdev_lock(ch->cdev), saveflags);
1562 if (rc != 0) {
1563 fsm_newstate(fi, CTC_STATE_RXINIT);
1564 ctcm_ccw_check_rc(ch, rc, "initial RX");
1565 goto done;
1566 }
1567 break;
1568 default:
1569 break;
1570 }
1571
1572 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1573done:
1574 return;
1575}
1576
1577/*
1578 * ctcmpc channel FSM action
1579 * called from several points in ctcmpc_ch_fsm
1580 * ctcmpc only
1581 */
1582static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1583{
1584 struct channel *ch = arg;
1585 struct net_device *dev = ch->netdev;
1586 struct ctcm_priv *priv = dev->ml_priv;
1587 struct mpc_group *grp = priv->mpcg;
1588
1589 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1590 __func__, dev->name, ch->id, ch, smp_processor_id(),
1591 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1592
1593 switch (fsm_getstate(grp->fsm)) {
1594 case MPCG_STATE_XID2INITW:
1595 /* ok..start yside xid exchanges */
1596 if (!ch->in_mpcgroup)
1597 break;
1598 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1599 fsm_deltimer(&grp->timer);
1600 fsm_addtimer(&grp->timer,
1601 MPC_XID_TIMEOUT_VALUE,
1602 MPCG_EVENT_TIMER, dev);
1603 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1604
1605 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1606 /* attn rcvd before xid0 processed via bh */
1607 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1608 break;
1609 case MPCG_STATE_XID2INITX:
1610 case MPCG_STATE_XID0IOWAIT:
1611 case MPCG_STATE_XID0IOWAIX:
1612 /* attn rcvd before xid0 processed on ch
1613 but mid-xid0 processing for group */
1614 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1615 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1616 break;
1617 case MPCG_STATE_XID7INITW:
1618 case MPCG_STATE_XID7INITX:
1619 case MPCG_STATE_XID7INITI:
1620 case MPCG_STATE_XID7INITZ:
1621 switch (fsm_getstate(ch->fsm)) {
1622 case CH_XID7_PENDING:
1623 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1624 break;
1625 case CH_XID7_PENDING2:
1626 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1627 break;
1628 }
1629 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1630 break;
1631 }
1632
1633 return;
1634}
1635
1636/*
1637 * ctcmpc channel FSM action
1638 * called from one point in ctcmpc_ch_fsm
1639 * ctcmpc only
1640 */
1641static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1642{
1643 struct channel *ch = arg;
1644 struct net_device *dev = ch->netdev;
1645 struct ctcm_priv *priv = dev->ml_priv;
1646 struct mpc_group *grp = priv->mpcg;
1647
1648 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1649 __func__, dev->name, ch->id,
1650 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1651
1652 fsm_deltimer(&ch->timer);
1653
1654 switch (fsm_getstate(grp->fsm)) {
1655 case MPCG_STATE_XID0IOWAIT:
1656 /* vtam wants to be primary.start yside xid exchanges*/
1657 /* only receive one attn-busy at a time so must not */
1658 /* change state each time */
1659 grp->changed_side = 1;
1660 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1661 break;
1662 case MPCG_STATE_XID2INITW:
1663 if (grp->changed_side == 1) {
1664 grp->changed_side = 2;
1665 break;
1666 }
1667 /* process began via call to establish_conn */
1668 /* so must report failure instead of reverting */
1669 /* back to ready-for-xid passive state */
1670 if (grp->estconnfunc)
1671 goto done;
1672 /* this attnbusy is NOT the result of xside xid */
1673 /* collisions so yside must have been triggered */
1674 /* by an ATTN that was not intended to start XID */
1675 /* processing. Revert back to ready-for-xid and */
1676 /* wait for ATTN interrupt to signal xid start */
1677 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1678 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1679 fsm_deltimer(&grp->timer);
1680 goto done;
1681 }
1682 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1683 goto done;
1684 case MPCG_STATE_XID2INITX:
1685 /* XID2 was received before ATTN Busy for second
1686 channel.Send yside xid for second channel.
1687 */
1688 if (grp->changed_side == 1) {
1689 grp->changed_side = 2;
1690 break;
1691 }
1692 fallthrough;
1693 case MPCG_STATE_XID0IOWAIX:
1694 case MPCG_STATE_XID7INITW:
1695 case MPCG_STATE_XID7INITX:
1696 case MPCG_STATE_XID7INITI:
1697 case MPCG_STATE_XID7INITZ:
1698 default:
1699 /* multiple attn-busy indicates too out-of-sync */
1700 /* and they are certainly not being received as part */
1701 /* of valid mpc group negotiations.. */
1702 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1703 goto done;
1704 }
1705
1706 if (grp->changed_side == 1) {
1707 fsm_deltimer(&grp->timer);
1708 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1709 MPCG_EVENT_TIMER, dev);
1710 }
1711 if (ch->in_mpcgroup)
1712 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1713 else
1714 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1715 "%s(%s): channel %s not added to group",
1716 CTCM_FUNTAIL, dev->name, ch->id);
1717
1718done:
1719 return;
1720}
1721
1722/*
1723 * ctcmpc channel FSM action
1724 * called from several points in ctcmpc_ch_fsm
1725 * ctcmpc only
1726 */
1727static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1728{
1729 struct channel *ch = arg;
1730 struct net_device *dev = ch->netdev;
1731 struct ctcm_priv *priv = dev->ml_priv;
1732 struct mpc_group *grp = priv->mpcg;
1733
1734 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1735 return;
1736}
1737
1738/*
1739 * ctcmpc channel FSM action
1740 * called from several points in ctcmpc_ch_fsm
1741 * ctcmpc only
1742 */
1743static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1744{
1745 struct channel *ach = arg;
1746 struct net_device *dev = ach->netdev;
1747 struct ctcm_priv *priv = dev->ml_priv;
1748 struct mpc_group *grp = priv->mpcg;
1749 struct channel *wch = priv->channel[CTCM_WRITE];
1750 struct channel *rch = priv->channel[CTCM_READ];
1751 struct sk_buff *skb;
1752 struct th_sweep *header;
1753 int rc = 0;
1754 unsigned long saveflags = 0;
1755
1756 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1757 __func__, smp_processor_id(), ach, ach->id);
1758
1759 if (grp->in_sweep == 0)
1760 goto done;
1761
1762 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1763 __func__, wch->th_seq_num);
1764 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1765 __func__, rch->th_seq_num);
1766
1767 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1768 /* give the previous IO time to complete */
1769 fsm_addtimer(&wch->sweep_timer,
1770 200, CTC_EVENT_RSWEEP_TIMER, wch);
1771 goto done;
1772 }
1773
1774 skb = skb_dequeue(&wch->sweep_queue);
1775 if (!skb)
1776 goto done;
1777
1778 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1779 grp->in_sweep = 0;
1780 ctcm_clear_busy_do(dev);
1781 dev_kfree_skb_any(skb);
1782 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1783 goto done;
1784 } else {
1785 refcount_inc(&skb->users);
1786 skb_queue_tail(&wch->io_queue, skb);
1787 }
1788
1789 /* send out the sweep */
1790 wch->ccw[4].count = skb->len;
1791
1792 header = (struct th_sweep *)skb->data;
1793 switch (header->th.th_ch_flag) {
1794 case TH_SWEEP_REQ:
1795 grp->sweep_req_pend_num--;
1796 break;
1797 case TH_SWEEP_RESP:
1798 grp->sweep_rsp_pend_num--;
1799 break;
1800 }
1801
1802 header->sw.th_last_seq = wch->th_seq_num;
1803
1804 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1805 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1806 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1807
1808 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1809 fsm_newstate(wch->fsm, CTC_STATE_TX);
1810
1811 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1812 wch->prof.send_stamp = jiffies;
1813 rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0);
1814 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1815
1816 if ((grp->sweep_req_pend_num == 0) &&
1817 (grp->sweep_rsp_pend_num == 0)) {
1818 grp->in_sweep = 0;
1819 rch->th_seq_num = 0x00;
1820 wch->th_seq_num = 0x00;
1821 ctcm_clear_busy_do(dev);
1822 }
1823
1824 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1825 __func__, wch->th_seq_num, rch->th_seq_num);
1826
1827 if (rc != 0)
1828 ctcm_ccw_check_rc(wch, rc, "send sweep");
1829
1830done:
1831 return;
1832}
1833
1834
1835/*
1836 * The ctcmpc statemachine for a channel.
1837 */
1838
1839const fsm_node ctcmpc_ch_fsm[] = {
1840 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1841 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1842 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1843 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1844 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1845
1846 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1847 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1848 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1849 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1850 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1851 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1852 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1853 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1854
1855 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1856 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1857 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1858 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1859 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1860 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1861
1862 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1863 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1864 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1865 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1866 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1867
1868 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1869 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1870 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1871 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1872 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1873 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1874 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1875 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876
1877 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1878 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1879 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1880 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1881 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1882 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1883 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1884 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1885 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1886 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1887
1888 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1889 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1890 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1891 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1892 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1893 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1894 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1895 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1896 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1897 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1898
1899 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1900 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1901 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1902 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1903 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1904 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1905 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1906 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1907 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1908 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1909 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1910
1911 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1912 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1913 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1914 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1915 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1916 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1917 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1918 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1919 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1920 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1921 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1922 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1923 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1924
1925 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1926 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1927 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1928 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1929 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1930 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1931 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1932 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1933 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1934 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1935 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1936 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1937
1938 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1939 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1940 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1941 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1942 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1943 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1944 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1945 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1946 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1947 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1948 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1949 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1950
1951 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1952 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1953 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1954 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1955 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1956 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1957 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1958 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1959 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1960 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1961 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1962 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1963
1964 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1965 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1966 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1967 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1968 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1969 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1970 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1971 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1972 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1973 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1974 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1975 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1976
1977 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1978 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1979 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1980 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1981 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1982 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1983 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1984 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1985
1986 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1987 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1988 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1989 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1990 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1991 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1992 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1993 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1994 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
1995
1996 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1997 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1998 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1999 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2000 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2001 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2002 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2003 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2004
2005 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2006 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2007 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2008 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2009 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2010 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2011 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2012 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2013
2014 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2015 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2016 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2017 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2018 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2019 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2020 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2021
2022 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2023 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2024 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2025 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2026 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2027 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2028 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2029 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2030 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2031 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2032
2033 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2034 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2035 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2036 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2037 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2038};
2039
2040int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2041
2042/*
2043 * Actions for interface - statemachine.
2044 */
2045
2046/*
2047 * Startup channels by sending CTC_EVENT_START to each channel.
2048 *
2049 * fi An instance of an interface statemachine.
2050 * event The event, just happened.
2051 * arg Generic pointer, casted from struct net_device * upon call.
2052 */
2053static void dev_action_start(fsm_instance *fi, int event, void *arg)
2054{
2055 struct net_device *dev = arg;
2056 struct ctcm_priv *priv = dev->ml_priv;
2057 int direction;
2058
2059 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2060
2061 fsm_deltimer(&priv->restart_timer);
2062 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2063 if (IS_MPC(priv))
2064 priv->mpcg->channels_terminating = 0;
2065 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2066 struct channel *ch = priv->channel[direction];
2067 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2068 }
2069}
2070
2071/*
2072 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2073 *
2074 * fi An instance of an interface statemachine.
2075 * event The event, just happened.
2076 * arg Generic pointer, casted from struct net_device * upon call.
2077 */
2078static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2079{
2080 int direction;
2081 struct net_device *dev = arg;
2082 struct ctcm_priv *priv = dev->ml_priv;
2083
2084 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2085
2086 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2087 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2088 struct channel *ch = priv->channel[direction];
2089 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2090 ch->th_seq_num = 0x00;
2091 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2092 __func__, ch->th_seq_num);
2093 }
2094 if (IS_MPC(priv))
2095 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2096}
2097
2098static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2099{
2100 int restart_timer;
2101 struct net_device *dev = arg;
2102 struct ctcm_priv *priv = dev->ml_priv;
2103
2104 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2105
2106 if (IS_MPC(priv)) {
2107 restart_timer = CTCM_TIME_1_SEC;
2108 } else {
2109 restart_timer = CTCM_TIME_5_SEC;
2110 }
2111 dev_info(&dev->dev, "Restarting device\n");
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 */
2133static 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 dev_info(&dev->dev,
2154 "Connected with remote side\n");
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 dev_info(&dev->dev,
2162 "Connected with remote side\n");
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[CTCM_READ],
2179 CTCM_READ, MPC_CHANNEL_ADD);
2180 else
2181 mpc_channel_action(priv->channel[CTCM_WRITE],
2182 CTCM_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 */
2194static 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[CTCM_READ],
2235 CTCM_READ, MPC_CHANNEL_REMOVE);
2236 else
2237 mpc_channel_action(priv->channel[CTCM_WRITE],
2238 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2239 }
2240}
2241
2242const 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
2282int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2283
2284/* --- This is the END my friend --- */
2285