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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],
311 (unsigned long)ch, 0xff, 0);
312 ch->prof.doios_multi++;
313 if (rc != 0) {
314 priv->stats.tx_dropped += i;
315 priv->stats.tx_errors += i;
316 fsm_deltimer(&ch->timer);
317 ctcm_ccw_check_rc(ch, rc, "chained TX");
318 }
319 } else {
320 spin_unlock(&ch->collect_lock);
321 fsm_newstate(fi, CTC_STATE_TXIDLE);
322 }
323 ctcm_clear_busy_do(dev);
324}
325
326/**
327 * Initial data is sent.
328 * Notify device statemachine that we are up and
329 * running.
330 *
331 * fi An instance of a channel statemachine.
332 * event The event, just happened.
333 * arg Generic pointer, casted from channel * upon call.
334 */
335void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
336{
337 struct channel *ch = arg;
338 struct net_device *dev = ch->netdev;
339 struct ctcm_priv *priv = dev->ml_priv;
340
341 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
342
343 fsm_deltimer(&ch->timer);
344 fsm_newstate(fi, CTC_STATE_TXIDLE);
345 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
346}
347
348/**
349 * Got normal data, check for sanity, queue it up, allocate new buffer
350 * trigger bottom half, and initiate next read.
351 *
352 * fi An instance of a channel statemachine.
353 * event The event, just happened.
354 * arg Generic pointer, casted from channel * upon call.
355 */
356static void chx_rx(fsm_instance *fi, int event, void *arg)
357{
358 struct channel *ch = arg;
359 struct net_device *dev = ch->netdev;
360 struct ctcm_priv *priv = dev->ml_priv;
361 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
362 struct sk_buff *skb = ch->trans_skb;
363 __u16 block_len = *((__u16 *)skb->data);
364 int check_len;
365 int rc;
366
367 fsm_deltimer(&ch->timer);
368 if (len < 8) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
370 "%s(%s): got packet with length %d < 8\n",
371 CTCM_FUNTAIL, dev->name, len);
372 priv->stats.rx_dropped++;
373 priv->stats.rx_length_errors++;
374 goto again;
375 }
376 if (len > ch->max_bufsize) {
377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
378 "%s(%s): got packet with length %d > %d\n",
379 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
380 priv->stats.rx_dropped++;
381 priv->stats.rx_length_errors++;
382 goto again;
383 }
384
385 /*
386 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
387 */
388 switch (ch->protocol) {
389 case CTCM_PROTO_S390:
390 case CTCM_PROTO_OS390:
391 check_len = block_len + 2;
392 break;
393 default:
394 check_len = block_len;
395 break;
396 }
397 if ((len < block_len) || (len > check_len)) {
398 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
399 "%s(%s): got block length %d != rx length %d\n",
400 CTCM_FUNTAIL, dev->name, block_len, len);
401 if (do_debug)
402 ctcmpc_dump_skb(skb, 0);
403
404 *((__u16 *)skb->data) = len;
405 priv->stats.rx_dropped++;
406 priv->stats.rx_length_errors++;
407 goto again;
408 }
409 if (block_len > 2) {
410 *((__u16 *)skb->data) = block_len - 2;
411 ctcm_unpack_skb(ch, skb);
412 }
413 again:
414 skb->data = ch->trans_skb_data;
415 skb_reset_tail_pointer(skb);
416 skb->len = 0;
417 if (ctcm_checkalloc_buffer(ch))
418 return;
419 ch->ccw[1].count = ch->max_bufsize;
420 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
421 (unsigned long)ch, 0xff, 0);
422 if (rc != 0)
423 ctcm_ccw_check_rc(ch, rc, "normal RX");
424}
425
426/**
427 * Initialize connection by sending a __u16 of value 0.
428 *
429 * fi An instance of a channel statemachine.
430 * event The event, just happened.
431 * arg Generic pointer, casted from channel * upon call.
432 */
433static void chx_firstio(fsm_instance *fi, int event, void *arg)
434{
435 int rc;
436 struct channel *ch = arg;
437 int fsmstate = fsm_getstate(fi);
438
439 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
440 "%s(%s) : %02x",
441 CTCM_FUNTAIL, ch->id, fsmstate);
442
443 ch->sense_rc = 0; /* reset unit check report control */
444 if (fsmstate == CTC_STATE_TXIDLE)
445 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
446 "%s(%s): remote side issued READ?, init.\n",
447 CTCM_FUNTAIL, ch->id);
448 fsm_deltimer(&ch->timer);
449 if (ctcm_checkalloc_buffer(ch))
450 return;
451 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
452 (ch->protocol == CTCM_PROTO_OS390)) {
453 /* OS/390 resp. z/OS */
454 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
455 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
456 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
457 CTC_EVENT_TIMER, ch);
458 chx_rxidle(fi, event, arg);
459 } else {
460 struct net_device *dev = ch->netdev;
461 struct ctcm_priv *priv = dev->ml_priv;
462 fsm_newstate(fi, CTC_STATE_TXIDLE);
463 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
464 }
465 return;
466 }
467 /*
468 * Don't setup a timer for receiving the initial RX frame
469 * if in compatibility mode, since VM TCP delays the initial
470 * frame until it has some data to send.
471 */
472 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
473 (ch->protocol != CTCM_PROTO_S390))
474 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
475
476 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
477 ch->ccw[1].count = 2; /* Transfer only length */
478
479 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
480 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
481 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
482 (unsigned long)ch, 0xff, 0);
483 if (rc != 0) {
484 fsm_deltimer(&ch->timer);
485 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
486 ctcm_ccw_check_rc(ch, rc, "init IO");
487 }
488 /*
489 * If in compatibility mode since we don't setup a timer, we
490 * also signal RX channel up immediately. This enables us
491 * to send packets early which in turn usually triggers some
492 * reply from VM TCP which brings up the RX channel to it's
493 * final state.
494 */
495 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
496 (ch->protocol == CTCM_PROTO_S390)) {
497 struct net_device *dev = ch->netdev;
498 struct ctcm_priv *priv = dev->ml_priv;
499 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
500 }
501}
502
503/**
504 * Got initial data, check it. If OK,
505 * notify device statemachine that we are up and
506 * running.
507 *
508 * fi An instance of a channel statemachine.
509 * event The event, just happened.
510 * arg Generic pointer, casted from channel * upon call.
511 */
512static void chx_rxidle(fsm_instance *fi, int event, void *arg)
513{
514 struct channel *ch = arg;
515 struct net_device *dev = ch->netdev;
516 struct ctcm_priv *priv = dev->ml_priv;
517 __u16 buflen;
518 int rc;
519
520 fsm_deltimer(&ch->timer);
521 buflen = *((__u16 *)ch->trans_skb->data);
522 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
523 __func__, dev->name, buflen);
524
525 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
526 if (ctcm_checkalloc_buffer(ch))
527 return;
528 ch->ccw[1].count = ch->max_bufsize;
529 fsm_newstate(fi, CTC_STATE_RXIDLE);
530 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
531 (unsigned long)ch, 0xff, 0);
532 if (rc != 0) {
533 fsm_newstate(fi, CTC_STATE_RXINIT);
534 ctcm_ccw_check_rc(ch, rc, "initial RX");
535 } else
536 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
537 } else {
538 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
539 __func__, dev->name,
540 buflen, CTCM_INITIAL_BLOCKLEN);
541 chx_firstio(fi, event, arg);
542 }
543}
544
545/**
546 * Set channel into extended mode.
547 *
548 * fi An instance of a channel statemachine.
549 * event The event, just happened.
550 * arg Generic pointer, casted from channel * upon call.
551 */
552static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
553{
554 struct channel *ch = arg;
555 int rc;
556 unsigned long saveflags = 0;
557 int timeout = CTCM_TIME_5_SEC;
558
559 fsm_deltimer(&ch->timer);
560 if (IS_MPC(ch)) {
561 timeout = 1500;
562 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
563 __func__, smp_processor_id(), ch, ch->id);
564 }
565 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
566 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
567 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
568
569 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
571 /* Such conditional locking is undeterministic in
572 * static view. => ignore sparse warnings here. */
573
574 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
575 (unsigned long)ch, 0xff, 0);
576 if (event == CTC_EVENT_TIMER) /* see above comments */
577 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
578 if (rc != 0) {
579 fsm_deltimer(&ch->timer);
580 fsm_newstate(fi, CTC_STATE_STARTWAIT);
581 ctcm_ccw_check_rc(ch, rc, "set Mode");
582 } else
583 ch->retry = 0;
584}
585
586/**
587 * Setup channel.
588 *
589 * fi An instance of a channel statemachine.
590 * event The event, just happened.
591 * arg Generic pointer, casted from channel * upon call.
592 */
593static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
594{
595 struct channel *ch = arg;
596 unsigned long saveflags;
597 int rc;
598
599 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
600 CTCM_FUNTAIL, ch->id,
601 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
602
603 if (ch->trans_skb != NULL) {
604 clear_normalized_cda(&ch->ccw[1]);
605 dev_kfree_skb(ch->trans_skb);
606 ch->trans_skb = NULL;
607 }
608 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
609 ch->ccw[1].cmd_code = CCW_CMD_READ;
610 ch->ccw[1].flags = CCW_FLAG_SLI;
611 ch->ccw[1].count = 0;
612 } else {
613 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
614 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
615 ch->ccw[1].count = 0;
616 }
617 if (ctcm_checkalloc_buffer(ch)) {
618 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
619 "%s(%s): %s trans_skb alloc delayed "
620 "until first transfer",
621 CTCM_FUNTAIL, ch->id,
622 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
623 "RX" : "TX");
624 }
625 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
626 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
627 ch->ccw[0].count = 0;
628 ch->ccw[0].cda = 0;
629 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
630 ch->ccw[2].flags = CCW_FLAG_SLI;
631 ch->ccw[2].count = 0;
632 ch->ccw[2].cda = 0;
633 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
634 ch->ccw[4].cda = 0;
635 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
636
637 fsm_newstate(fi, CTC_STATE_STARTWAIT);
638 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
639 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
640 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
641 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
642 if (rc != 0) {
643 if (rc != -EBUSY)
644 fsm_deltimer(&ch->timer);
645 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
646 }
647}
648
649/**
650 * Shutdown a channel.
651 *
652 * fi An instance of a channel statemachine.
653 * event The event, just happened.
654 * arg Generic pointer, casted from channel * upon call.
655 */
656static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
657{
658 struct channel *ch = arg;
659 unsigned long saveflags = 0;
660 int rc;
661 int oldstate;
662
663 fsm_deltimer(&ch->timer);
664 if (IS_MPC(ch))
665 fsm_deltimer(&ch->sweep_timer);
666
667 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
668
669 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
670 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
671 /* Such conditional locking is undeterministic in
672 * static view. => ignore sparse warnings here. */
673 oldstate = fsm_getstate(fi);
674 fsm_newstate(fi, CTC_STATE_TERM);
675 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
676
677 if (event == CTC_EVENT_STOP)
678 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
679 /* see remark above about conditional locking */
680
681 if (rc != 0 && rc != -EBUSY) {
682 fsm_deltimer(&ch->timer);
683 if (event != CTC_EVENT_STOP) {
684 fsm_newstate(fi, oldstate);
685 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
686 }
687 }
688}
689
690/**
691 * Cleanup helper for chx_fail and chx_stopped
692 * cleanup channels queue and notify interface statemachine.
693 *
694 * fi An instance of a channel statemachine.
695 * state The next state (depending on caller).
696 * ch The channel to operate on.
697 */
698static void ctcm_chx_cleanup(fsm_instance *fi, int state,
699 struct channel *ch)
700{
701 struct net_device *dev = ch->netdev;
702 struct ctcm_priv *priv = dev->ml_priv;
703
704 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
705 "%s(%s): %s[%d]\n",
706 CTCM_FUNTAIL, dev->name, ch->id, state);
707
708 fsm_deltimer(&ch->timer);
709 if (IS_MPC(ch))
710 fsm_deltimer(&ch->sweep_timer);
711
712 fsm_newstate(fi, state);
713 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
714 clear_normalized_cda(&ch->ccw[1]);
715 dev_kfree_skb_any(ch->trans_skb);
716 ch->trans_skb = NULL;
717 }
718
719 ch->th_seg = 0x00;
720 ch->th_seq_num = 0x00;
721 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
722 skb_queue_purge(&ch->io_queue);
723 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
724 } else {
725 ctcm_purge_skb_queue(&ch->io_queue);
726 if (IS_MPC(ch))
727 ctcm_purge_skb_queue(&ch->sweep_queue);
728 spin_lock(&ch->collect_lock);
729 ctcm_purge_skb_queue(&ch->collect_queue);
730 ch->collect_len = 0;
731 spin_unlock(&ch->collect_lock);
732 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
733 }
734}
735
736/**
737 * A channel has successfully been halted.
738 * Cleanup it's queue and notify interface statemachine.
739 *
740 * fi An instance of a channel statemachine.
741 * event The event, just happened.
742 * arg Generic pointer, casted from channel * upon call.
743 */
744static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
745{
746 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
747}
748
749/**
750 * A stop command from device statemachine arrived and we are in
751 * not operational mode. Set state to stopped.
752 *
753 * fi An instance of a channel statemachine.
754 * event The event, just happened.
755 * arg Generic pointer, casted from channel * upon call.
756 */
757static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
758{
759 fsm_newstate(fi, CTC_STATE_STOPPED);
760}
761
762/**
763 * A machine check for no path, not operational status or gone device has
764 * happened.
765 * Cleanup queue and notify interface statemachine.
766 *
767 * fi An instance of a channel statemachine.
768 * event The event, just happened.
769 * arg Generic pointer, casted from channel * upon call.
770 */
771static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
772{
773 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
774}
775
776/**
777 * Handle error during setup of channel.
778 *
779 * fi An instance of a channel statemachine.
780 * event The event, just happened.
781 * arg Generic pointer, casted from channel * upon call.
782 */
783static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
784{
785 struct channel *ch = arg;
786 struct net_device *dev = ch->netdev;
787 struct ctcm_priv *priv = dev->ml_priv;
788
789 /*
790 * Special case: Got UC_RCRESET on setmode.
791 * This means that remote side isn't setup. In this case
792 * simply retry after some 10 secs...
793 */
794 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
795 ((event == CTC_EVENT_UC_RCRESET) ||
796 (event == CTC_EVENT_UC_RSRESET))) {
797 fsm_newstate(fi, CTC_STATE_STARTRETRY);
798 fsm_deltimer(&ch->timer);
799 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
800 if (!IS_MPC(ch) &&
801 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
802 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
803 if (rc != 0)
804 ctcm_ccw_check_rc(ch, rc,
805 "HaltIO in chx_setuperr");
806 }
807 return;
808 }
809
810 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
811 "%s(%s) : %s error during %s channel setup state=%s\n",
812 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
813 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
814 fsm_getstate_str(fi));
815
816 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
817 fsm_newstate(fi, CTC_STATE_RXERR);
818 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
819 } else {
820 fsm_newstate(fi, CTC_STATE_TXERR);
821 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
822 }
823}
824
825/**
826 * Restart a channel after an error.
827 *
828 * fi An instance of a channel statemachine.
829 * event The event, just happened.
830 * arg Generic pointer, casted from channel * upon call.
831 */
832static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
833{
834 struct channel *ch = arg;
835 struct net_device *dev = ch->netdev;
836 unsigned long saveflags = 0;
837 int oldstate;
838 int rc;
839
840 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
841 "%s: %s[%d] of %s\n",
842 CTCM_FUNTAIL, ch->id, event, dev->name);
843
844 fsm_deltimer(&ch->timer);
845
846 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
847 oldstate = fsm_getstate(fi);
848 fsm_newstate(fi, CTC_STATE_STARTWAIT);
849 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
850 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
851 /* Such conditional locking is a known problem for
852 * sparse because its undeterministic in static view.
853 * Warnings should be ignored here. */
854 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
855 if (event == CTC_EVENT_TIMER)
856 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
857 if (rc != 0) {
858 if (rc != -EBUSY) {
859 fsm_deltimer(&ch->timer);
860 fsm_newstate(fi, oldstate);
861 }
862 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
863 }
864}
865
866/**
867 * Handle error during RX initial handshake (exchange of
868 * 0-length block header)
869 *
870 * fi An instance of a channel statemachine.
871 * event The event, just happened.
872 * arg Generic pointer, casted from channel * upon call.
873 */
874static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
875{
876 struct channel *ch = arg;
877 struct net_device *dev = ch->netdev;
878 struct ctcm_priv *priv = dev->ml_priv;
879
880 if (event == CTC_EVENT_TIMER) {
881 if (!IS_MPCDEV(dev))
882 /* TODO : check if MPC deletes timer somewhere */
883 fsm_deltimer(&ch->timer);
884 if (ch->retry++ < 3)
885 ctcm_chx_restart(fi, event, arg);
886 else {
887 fsm_newstate(fi, CTC_STATE_RXERR);
888 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
889 }
890 } else {
891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
892 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
893 ctc_ch_event_names[event], fsm_getstate_str(fi));
894
895 dev_warn(&dev->dev,
896 "Initialization failed with RX/TX init handshake "
897 "error %s\n", ctc_ch_event_names[event]);
898 }
899}
900
901/**
902 * Notify device statemachine if we gave up initialization
903 * of RX channel.
904 *
905 * fi An instance of a channel statemachine.
906 * event The event, just happened.
907 * arg Generic pointer, casted from channel * upon call.
908 */
909static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
910{
911 struct channel *ch = arg;
912 struct net_device *dev = ch->netdev;
913 struct ctcm_priv *priv = dev->ml_priv;
914
915 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
916 "%s(%s): RX %s busy, init. fail",
917 CTCM_FUNTAIL, dev->name, ch->id);
918 fsm_newstate(fi, CTC_STATE_RXERR);
919 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
920}
921
922/**
923 * Handle RX Unit check remote reset (remote disconnected)
924 *
925 * fi An instance of a channel statemachine.
926 * event The event, just happened.
927 * arg Generic pointer, casted from channel * upon call.
928 */
929static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
930{
931 struct channel *ch = arg;
932 struct channel *ch2;
933 struct net_device *dev = ch->netdev;
934 struct ctcm_priv *priv = dev->ml_priv;
935
936 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
937 "%s: %s: remote disconnect - re-init ...",
938 CTCM_FUNTAIL, dev->name);
939 fsm_deltimer(&ch->timer);
940 /*
941 * Notify device statemachine
942 */
943 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
944 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
945
946 fsm_newstate(fi, CTC_STATE_DTERM);
947 ch2 = priv->channel[CTCM_WRITE];
948 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
949
950 ccw_device_halt(ch->cdev, (unsigned long)ch);
951 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
952}
953
954/**
955 * Handle error during TX channel initialization.
956 *
957 * fi An instance of a channel statemachine.
958 * event The event, just happened.
959 * arg Generic pointer, casted from channel * upon call.
960 */
961static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
962{
963 struct channel *ch = arg;
964 struct net_device *dev = ch->netdev;
965 struct ctcm_priv *priv = dev->ml_priv;
966
967 if (event == CTC_EVENT_TIMER) {
968 fsm_deltimer(&ch->timer);
969 if (ch->retry++ < 3)
970 ctcm_chx_restart(fi, event, arg);
971 else {
972 fsm_newstate(fi, CTC_STATE_TXERR);
973 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
974 }
975 } else {
976 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
977 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
978 ctc_ch_event_names[event], fsm_getstate_str(fi));
979
980 dev_warn(&dev->dev,
981 "Initialization failed with RX/TX init handshake "
982 "error %s\n", ctc_ch_event_names[event]);
983 }
984}
985
986/**
987 * Handle TX timeout by retrying operation.
988 *
989 * fi An instance of a channel statemachine.
990 * event The event, just happened.
991 * arg Generic pointer, casted from channel * upon call.
992 */
993static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
994{
995 struct channel *ch = arg;
996 struct net_device *dev = ch->netdev;
997 struct ctcm_priv *priv = dev->ml_priv;
998 struct sk_buff *skb;
999
1000 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1001 __func__, smp_processor_id(), ch, ch->id);
1002
1003 fsm_deltimer(&ch->timer);
1004 if (ch->retry++ > 3) {
1005 struct mpc_group *gptr = priv->mpcg;
1006 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1007 "%s: %s: retries exceeded",
1008 CTCM_FUNTAIL, ch->id);
1009 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1010 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1011 use gptr as mpc indicator */
1012 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1013 ctcm_chx_restart(fi, event, arg);
1014 goto done;
1015 }
1016
1017 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1018 "%s : %s: retry %d",
1019 CTCM_FUNTAIL, ch->id, ch->retry);
1020 skb = skb_peek(&ch->io_queue);
1021 if (skb) {
1022 int rc = 0;
1023 unsigned long saveflags = 0;
1024 clear_normalized_cda(&ch->ccw[4]);
1025 ch->ccw[4].count = skb->len;
1026 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1027 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1028 "%s: %s: IDAL alloc failed",
1029 CTCM_FUNTAIL, ch->id);
1030 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1031 ctcm_chx_restart(fi, event, arg);
1032 goto done;
1033 }
1034 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1035 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1036 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1037 /* Such conditional locking is a known problem for
1038 * sparse because its undeterministic in static view.
1039 * Warnings should be ignored here. */
1040 if (do_debug_ccw)
1041 ctcmpc_dumpit((char *)&ch->ccw[3],
1042 sizeof(struct ccw1) * 3);
1043
1044 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1045 (unsigned long)ch, 0xff, 0);
1046 if (event == CTC_EVENT_TIMER)
1047 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1048 saveflags);
1049 if (rc != 0) {
1050 fsm_deltimer(&ch->timer);
1051 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1052 ctcm_purge_skb_queue(&ch->io_queue);
1053 }
1054 }
1055done:
1056 return;
1057}
1058
1059/**
1060 * Handle fatal errors during an I/O command.
1061 *
1062 * fi An instance of a channel statemachine.
1063 * event The event, just happened.
1064 * arg Generic pointer, casted from channel * upon call.
1065 */
1066static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1067{
1068 struct channel *ch = arg;
1069 struct net_device *dev = ch->netdev;
1070 struct ctcm_priv *priv = dev->ml_priv;
1071 int rd = CHANNEL_DIRECTION(ch->flags);
1072
1073 fsm_deltimer(&ch->timer);
1074 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1075 "%s: %s: %s unrecoverable channel error",
1076 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1077
1078 if (IS_MPC(ch)) {
1079 priv->stats.tx_dropped++;
1080 priv->stats.tx_errors++;
1081 }
1082 if (rd == CTCM_READ) {
1083 fsm_newstate(fi, CTC_STATE_RXERR);
1084 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1085 } else {
1086 fsm_newstate(fi, CTC_STATE_TXERR);
1087 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1088 }
1089}
1090
1091/*
1092 * The ctcm statemachine for a channel.
1093 */
1094const fsm_node ch_fsm[] = {
1095 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1096 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1097 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1098 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1099
1100 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1101 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1102 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1103 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1104 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1105
1106 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1107 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1108 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1109 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1110 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1111 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1112
1113 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1114 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1115 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1116 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1117
1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1126
1127 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1128 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1129 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1130 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1131 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1132 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1133 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1134 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1135 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1136 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1137
1138 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1139 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1140 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1141 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1142 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1143 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1144 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1145
1146 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1147 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1148 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1149 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1150 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1151 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1152 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1153 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1154
1155 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1156 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1157 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1158 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1159 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1160 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1161 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1162
1163 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1164 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1165 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1166 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1167 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1168 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1169
1170 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1171 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1172 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1173 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1174 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1175 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1176
1177 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1178 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1179 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1180 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1181 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1182 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1183 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1184 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1185
1186 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1187 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1188 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1189 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1190};
1191
1192int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1193
1194/*
1195 * MPC actions for mpc channel statemachine
1196 * handling of MPC protocol requires extra
1197 * statemachine and actions which are prefixed ctcmpc_ .
1198 * The ctc_ch_states and ctc_ch_state_names,
1199 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1200 * which are expanded by some elements.
1201 */
1202
1203/*
1204 * Actions for mpc channel statemachine.
1205 */
1206
1207/**
1208 * Normal data has been send. Free the corresponding
1209 * skb (it's in io_queue), reset dev->tbusy and
1210 * revert to idle state.
1211 *
1212 * fi An instance of a channel statemachine.
1213 * event The event, just happened.
1214 * arg Generic pointer, casted from channel * upon call.
1215 */
1216static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1217{
1218 struct channel *ch = arg;
1219 struct net_device *dev = ch->netdev;
1220 struct ctcm_priv *priv = dev->ml_priv;
1221 struct mpc_group *grp = priv->mpcg;
1222 struct sk_buff *skb;
1223 int first = 1;
1224 int i;
1225 __u32 data_space;
1226 unsigned long duration;
1227 struct sk_buff *peekskb;
1228 int rc;
1229 struct th_header *header;
1230 struct pdu *p_header;
1231 unsigned long done_stamp = jiffies;
1232
1233 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1234 __func__, dev->name, smp_processor_id());
1235
1236 duration = done_stamp - ch->prof.send_stamp;
1237 if (duration > ch->prof.tx_time)
1238 ch->prof.tx_time = duration;
1239
1240 if (ch->irb->scsw.cmd.count != 0)
1241 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1242 "%s(%s): TX not complete, remaining %d bytes",
1243 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1244 fsm_deltimer(&ch->timer);
1245 while ((skb = skb_dequeue(&ch->io_queue))) {
1246 priv->stats.tx_packets++;
1247 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1248 if (first) {
1249 priv->stats.tx_bytes += 2;
1250 first = 0;
1251 }
1252 refcount_dec(&skb->users);
1253 dev_kfree_skb_irq(skb);
1254 }
1255 spin_lock(&ch->collect_lock);
1256 clear_normalized_cda(&ch->ccw[4]);
1257 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1258 spin_unlock(&ch->collect_lock);
1259 fsm_newstate(fi, CTC_STATE_TXIDLE);
1260 goto done;
1261 }
1262
1263 if (ctcm_checkalloc_buffer(ch)) {
1264 spin_unlock(&ch->collect_lock);
1265 goto done;
1266 }
1267 ch->trans_skb->data = ch->trans_skb_data;
1268 skb_reset_tail_pointer(ch->trans_skb);
1269 ch->trans_skb->len = 0;
1270 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1271 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1272 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1273 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1274 i = 0;
1275 p_header = NULL;
1276 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1277
1278 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1279 " data_space:%04x\n",
1280 __func__, data_space);
1281
1282 while ((skb = skb_dequeue(&ch->collect_queue))) {
1283 skb_put_data(ch->trans_skb, skb->data, skb->len);
1284 p_header = (struct pdu *)
1285 (skb_tail_pointer(ch->trans_skb) - skb->len);
1286 p_header->pdu_flag = 0x00;
1287 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
1288 p_header->pdu_flag |= 0x60;
1289 else
1290 p_header->pdu_flag |= 0x20;
1291
1292 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1293 __func__, ch->trans_skb->len);
1294 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1295 " to 32 bytes sent to vtam\n", __func__);
1296 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1297
1298 ch->collect_len -= skb->len;
1299 data_space -= skb->len;
1300 priv->stats.tx_packets++;
1301 priv->stats.tx_bytes += skb->len;
1302 refcount_dec(&skb->users);
1303 dev_kfree_skb_any(skb);
1304 peekskb = skb_peek(&ch->collect_queue);
1305 if (peekskb->len > data_space)
1306 break;
1307 i++;
1308 }
1309 /* p_header points to the last one we handled */
1310 if (p_header)
1311 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1312 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1313 if (!header) {
1314 spin_unlock(&ch->collect_lock);
1315 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1316 goto done;
1317 }
1318 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1319 ch->th_seq_num++;
1320 header->th_seq_num = ch->th_seq_num;
1321
1322 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1323 __func__, ch->th_seq_num);
1324
1325 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1326 TH_HEADER_LENGTH); /* put the TH on the packet */
1327
1328 kfree(header);
1329
1330 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1331 __func__, ch->trans_skb->len);
1332 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1333 "data to vtam from collect_q\n", __func__);
1334 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1335 min_t(int, ch->trans_skb->len, 50));
1336
1337 spin_unlock(&ch->collect_lock);
1338 clear_normalized_cda(&ch->ccw[1]);
1339
1340 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1341 (void *)(unsigned long)ch->ccw[1].cda,
1342 ch->trans_skb->data);
1343 ch->ccw[1].count = ch->max_bufsize;
1344
1345 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1346 dev_kfree_skb_any(ch->trans_skb);
1347 ch->trans_skb = NULL;
1348 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1349 "%s: %s: IDAL alloc failed",
1350 CTCM_FUNTAIL, ch->id);
1351 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1352 return;
1353 }
1354
1355 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1356 (void *)(unsigned long)ch->ccw[1].cda,
1357 ch->trans_skb->data);
1358
1359 ch->ccw[1].count = ch->trans_skb->len;
1360 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1361 ch->prof.send_stamp = jiffies;
1362 if (do_debug_ccw)
1363 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1364 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1365 (unsigned long)ch, 0xff, 0);
1366 ch->prof.doios_multi++;
1367 if (rc != 0) {
1368 priv->stats.tx_dropped += i;
1369 priv->stats.tx_errors += i;
1370 fsm_deltimer(&ch->timer);
1371 ctcm_ccw_check_rc(ch, rc, "chained TX");
1372 }
1373done:
1374 ctcm_clear_busy(dev);
1375 return;
1376}
1377
1378/**
1379 * Got normal data, check for sanity, queue it up, allocate new buffer
1380 * trigger bottom half, and initiate next read.
1381 *
1382 * fi An instance of a channel statemachine.
1383 * event The event, just happened.
1384 * arg Generic pointer, casted from channel * upon call.
1385 */
1386static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1387{
1388 struct channel *ch = arg;
1389 struct net_device *dev = ch->netdev;
1390 struct ctcm_priv *priv = dev->ml_priv;
1391 struct mpc_group *grp = priv->mpcg;
1392 struct sk_buff *skb = ch->trans_skb;
1393 struct sk_buff *new_skb;
1394 unsigned long saveflags = 0; /* avoids compiler warning */
1395 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1396
1397 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1398 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1399 ch->id, ch->max_bufsize, len);
1400 fsm_deltimer(&ch->timer);
1401
1402 if (skb == NULL) {
1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1404 "%s(%s): TRANS_SKB = NULL",
1405 CTCM_FUNTAIL, dev->name);
1406 goto again;
1407 }
1408
1409 if (len < TH_HEADER_LENGTH) {
1410 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1411 "%s(%s): packet length %d to short",
1412 CTCM_FUNTAIL, dev->name, len);
1413 priv->stats.rx_dropped++;
1414 priv->stats.rx_length_errors++;
1415 } else {
1416 /* must have valid th header or game over */
1417 __u32 block_len = len;
1418 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1419 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1420
1421 if (new_skb == NULL) {
1422 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1423 "%s(%d): skb allocation failed",
1424 CTCM_FUNTAIL, dev->name);
1425 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1426 goto again;
1427 }
1428 switch (fsm_getstate(grp->fsm)) {
1429 case MPCG_STATE_RESET:
1430 case MPCG_STATE_INOP:
1431 dev_kfree_skb_any(new_skb);
1432 break;
1433 case MPCG_STATE_FLOWC:
1434 case MPCG_STATE_READY:
1435 skb_put_data(new_skb, skb->data, block_len);
1436 skb_queue_tail(&ch->io_queue, new_skb);
1437 tasklet_schedule(&ch->ch_tasklet);
1438 break;
1439 default:
1440 skb_put_data(new_skb, skb->data, len);
1441 skb_queue_tail(&ch->io_queue, new_skb);
1442 tasklet_hi_schedule(&ch->ch_tasklet);
1443 break;
1444 }
1445 }
1446
1447again:
1448 switch (fsm_getstate(grp->fsm)) {
1449 int rc, dolock;
1450 case MPCG_STATE_FLOWC:
1451 case MPCG_STATE_READY:
1452 if (ctcm_checkalloc_buffer(ch))
1453 break;
1454 ch->trans_skb->data = ch->trans_skb_data;
1455 skb_reset_tail_pointer(ch->trans_skb);
1456 ch->trans_skb->len = 0;
1457 ch->ccw[1].count = ch->max_bufsize;
1458 if (do_debug_ccw)
1459 ctcmpc_dumpit((char *)&ch->ccw[0],
1460 sizeof(struct ccw1) * 3);
1461 dolock = !in_irq();
1462 if (dolock)
1463 spin_lock_irqsave(
1464 get_ccwdev_lock(ch->cdev), saveflags);
1465 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1466 (unsigned long)ch, 0xff, 0);
1467 if (dolock) /* see remark about conditional locking */
1468 spin_unlock_irqrestore(
1469 get_ccwdev_lock(ch->cdev), saveflags);
1470 if (rc != 0)
1471 ctcm_ccw_check_rc(ch, rc, "normal RX");
1472 default:
1473 break;
1474 }
1475
1476 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1477 __func__, dev->name, ch, ch->id);
1478
1479}
1480
1481/**
1482 * Initialize connection by sending a __u16 of value 0.
1483 *
1484 * fi An instance of a channel statemachine.
1485 * event The event, just happened.
1486 * arg Generic pointer, casted from channel * upon call.
1487 */
1488static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1489{
1490 struct channel *ch = arg;
1491 struct net_device *dev = ch->netdev;
1492 struct ctcm_priv *priv = dev->ml_priv;
1493 struct mpc_group *gptr = priv->mpcg;
1494
1495 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1496 __func__, ch->id, ch);
1497
1498 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1499 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1500 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1501 fsm_getstate(gptr->fsm), ch->protocol);
1502
1503 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1504 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1505
1506 fsm_deltimer(&ch->timer);
1507 if (ctcm_checkalloc_buffer(ch))
1508 goto done;
1509
1510 switch (fsm_getstate(fi)) {
1511 case CTC_STATE_STARTRETRY:
1512 case CTC_STATE_SETUPWAIT:
1513 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1514 ctcmpc_chx_rxidle(fi, event, arg);
1515 } else {
1516 fsm_newstate(fi, CTC_STATE_TXIDLE);
1517 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1518 }
1519 goto done;
1520 default:
1521 break;
1522 }
1523
1524 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1525 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1526
1527done:
1528 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1529 __func__, ch->id, ch);
1530 return;
1531}
1532
1533/**
1534 * Got initial data, check it. If OK,
1535 * notify device statemachine that we are up and
1536 * running.
1537 *
1538 * fi An instance of a channel statemachine.
1539 * event The event, just happened.
1540 * arg Generic pointer, casted from channel * upon call.
1541 */
1542void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1543{
1544 struct channel *ch = arg;
1545 struct net_device *dev = ch->netdev;
1546 struct ctcm_priv *priv = dev->ml_priv;
1547 struct mpc_group *grp = priv->mpcg;
1548 int rc;
1549 unsigned long saveflags = 0; /* avoids compiler warning */
1550
1551 fsm_deltimer(&ch->timer);
1552 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1553 __func__, ch->id, dev->name, smp_processor_id(),
1554 fsm_getstate(fi), fsm_getstate(grp->fsm));
1555
1556 fsm_newstate(fi, CTC_STATE_RXIDLE);
1557 /* XID processing complete */
1558
1559 switch (fsm_getstate(grp->fsm)) {
1560 case MPCG_STATE_FLOWC:
1561 case MPCG_STATE_READY:
1562 if (ctcm_checkalloc_buffer(ch))
1563 goto done;
1564 ch->trans_skb->data = ch->trans_skb_data;
1565 skb_reset_tail_pointer(ch->trans_skb);
1566 ch->trans_skb->len = 0;
1567 ch->ccw[1].count = ch->max_bufsize;
1568 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1569 if (event == CTC_EVENT_START)
1570 /* see remark about conditional locking */
1571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1572 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1573 (unsigned long)ch, 0xff, 0);
1574 if (event == CTC_EVENT_START)
1575 spin_unlock_irqrestore(
1576 get_ccwdev_lock(ch->cdev), saveflags);
1577 if (rc != 0) {
1578 fsm_newstate(fi, CTC_STATE_RXINIT);
1579 ctcm_ccw_check_rc(ch, rc, "initial RX");
1580 goto done;
1581 }
1582 break;
1583 default:
1584 break;
1585 }
1586
1587 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1588done:
1589 return;
1590}
1591
1592/*
1593 * ctcmpc channel FSM action
1594 * called from several points in ctcmpc_ch_fsm
1595 * ctcmpc only
1596 */
1597static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1598{
1599 struct channel *ch = arg;
1600 struct net_device *dev = ch->netdev;
1601 struct ctcm_priv *priv = dev->ml_priv;
1602 struct mpc_group *grp = priv->mpcg;
1603
1604 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1605 __func__, dev->name, ch->id, ch, smp_processor_id(),
1606 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1607
1608 switch (fsm_getstate(grp->fsm)) {
1609 case MPCG_STATE_XID2INITW:
1610 /* ok..start yside xid exchanges */
1611 if (!ch->in_mpcgroup)
1612 break;
1613 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1614 fsm_deltimer(&grp->timer);
1615 fsm_addtimer(&grp->timer,
1616 MPC_XID_TIMEOUT_VALUE,
1617 MPCG_EVENT_TIMER, dev);
1618 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1619
1620 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1621 /* attn rcvd before xid0 processed via bh */
1622 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1623 break;
1624 case MPCG_STATE_XID2INITX:
1625 case MPCG_STATE_XID0IOWAIT:
1626 case MPCG_STATE_XID0IOWAIX:
1627 /* attn rcvd before xid0 processed on ch
1628 but mid-xid0 processing for group */
1629 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1630 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1631 break;
1632 case MPCG_STATE_XID7INITW:
1633 case MPCG_STATE_XID7INITX:
1634 case MPCG_STATE_XID7INITI:
1635 case MPCG_STATE_XID7INITZ:
1636 switch (fsm_getstate(ch->fsm)) {
1637 case CH_XID7_PENDING:
1638 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1639 break;
1640 case CH_XID7_PENDING2:
1641 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1642 break;
1643 }
1644 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1645 break;
1646 }
1647
1648 return;
1649}
1650
1651/*
1652 * ctcmpc channel FSM action
1653 * called from one point in ctcmpc_ch_fsm
1654 * ctcmpc only
1655 */
1656static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1657{
1658 struct channel *ch = arg;
1659 struct net_device *dev = ch->netdev;
1660 struct ctcm_priv *priv = dev->ml_priv;
1661 struct mpc_group *grp = priv->mpcg;
1662
1663 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1664 __func__, dev->name, ch->id,
1665 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1666
1667 fsm_deltimer(&ch->timer);
1668
1669 switch (fsm_getstate(grp->fsm)) {
1670 case MPCG_STATE_XID0IOWAIT:
1671 /* vtam wants to be primary.start yside xid exchanges*/
1672 /* only receive one attn-busy at a time so must not */
1673 /* change state each time */
1674 grp->changed_side = 1;
1675 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1676 break;
1677 case MPCG_STATE_XID2INITW:
1678 if (grp->changed_side == 1) {
1679 grp->changed_side = 2;
1680 break;
1681 }
1682 /* process began via call to establish_conn */
1683 /* so must report failure instead of reverting */
1684 /* back to ready-for-xid passive state */
1685 if (grp->estconnfunc)
1686 goto done;
1687 /* this attnbusy is NOT the result of xside xid */
1688 /* collisions so yside must have been triggered */
1689 /* by an ATTN that was not intended to start XID */
1690 /* processing. Revert back to ready-for-xid and */
1691 /* wait for ATTN interrupt to signal xid start */
1692 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1693 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1694 fsm_deltimer(&grp->timer);
1695 goto done;
1696 }
1697 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1698 goto done;
1699 case MPCG_STATE_XID2INITX:
1700 /* XID2 was received before ATTN Busy for second
1701 channel.Send yside xid for second channel.
1702 */
1703 if (grp->changed_side == 1) {
1704 grp->changed_side = 2;
1705 break;
1706 }
1707 case MPCG_STATE_XID0IOWAIX:
1708 case MPCG_STATE_XID7INITW:
1709 case MPCG_STATE_XID7INITX:
1710 case MPCG_STATE_XID7INITI:
1711 case MPCG_STATE_XID7INITZ:
1712 default:
1713 /* multiple attn-busy indicates too out-of-sync */
1714 /* and they are certainly not being received as part */
1715 /* of valid mpc group negotiations.. */
1716 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1717 goto done;
1718 }
1719
1720 if (grp->changed_side == 1) {
1721 fsm_deltimer(&grp->timer);
1722 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1723 MPCG_EVENT_TIMER, dev);
1724 }
1725 if (ch->in_mpcgroup)
1726 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1727 else
1728 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1729 "%s(%s): channel %s not added to group",
1730 CTCM_FUNTAIL, dev->name, ch->id);
1731
1732done:
1733 return;
1734}
1735
1736/*
1737 * ctcmpc channel FSM action
1738 * called from several points in ctcmpc_ch_fsm
1739 * ctcmpc only
1740 */
1741static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1742{
1743 struct channel *ch = arg;
1744 struct net_device *dev = ch->netdev;
1745 struct ctcm_priv *priv = dev->ml_priv;
1746 struct mpc_group *grp = priv->mpcg;
1747
1748 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1749 return;
1750}
1751
1752/*
1753 * ctcmpc channel FSM action
1754 * called from several points in ctcmpc_ch_fsm
1755 * ctcmpc only
1756 */
1757static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1758{
1759 struct channel *ach = arg;
1760 struct net_device *dev = ach->netdev;
1761 struct ctcm_priv *priv = dev->ml_priv;
1762 struct mpc_group *grp = priv->mpcg;
1763 struct channel *wch = priv->channel[CTCM_WRITE];
1764 struct channel *rch = priv->channel[CTCM_READ];
1765 struct sk_buff *skb;
1766 struct th_sweep *header;
1767 int rc = 0;
1768 unsigned long saveflags = 0;
1769
1770 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1771 __func__, smp_processor_id(), ach, ach->id);
1772
1773 if (grp->in_sweep == 0)
1774 goto done;
1775
1776 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1777 __func__, wch->th_seq_num);
1778 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1779 __func__, rch->th_seq_num);
1780
1781 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1782 /* give the previous IO time to complete */
1783 fsm_addtimer(&wch->sweep_timer,
1784 200, CTC_EVENT_RSWEEP_TIMER, wch);
1785 goto done;
1786 }
1787
1788 skb = skb_dequeue(&wch->sweep_queue);
1789 if (!skb)
1790 goto done;
1791
1792 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1793 grp->in_sweep = 0;
1794 ctcm_clear_busy_do(dev);
1795 dev_kfree_skb_any(skb);
1796 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1797 goto done;
1798 } else {
1799 refcount_inc(&skb->users);
1800 skb_queue_tail(&wch->io_queue, skb);
1801 }
1802
1803 /* send out the sweep */
1804 wch->ccw[4].count = skb->len;
1805
1806 header = (struct th_sweep *)skb->data;
1807 switch (header->th.th_ch_flag) {
1808 case TH_SWEEP_REQ:
1809 grp->sweep_req_pend_num--;
1810 break;
1811 case TH_SWEEP_RESP:
1812 grp->sweep_rsp_pend_num--;
1813 break;
1814 }
1815
1816 header->sw.th_last_seq = wch->th_seq_num;
1817
1818 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1819 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1820 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1821
1822 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1823 fsm_newstate(wch->fsm, CTC_STATE_TX);
1824
1825 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1826 wch->prof.send_stamp = jiffies;
1827 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1828 (unsigned long) wch, 0xff, 0);
1829 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1830
1831 if ((grp->sweep_req_pend_num == 0) &&
1832 (grp->sweep_rsp_pend_num == 0)) {
1833 grp->in_sweep = 0;
1834 rch->th_seq_num = 0x00;
1835 wch->th_seq_num = 0x00;
1836 ctcm_clear_busy_do(dev);
1837 }
1838
1839 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1840 __func__, wch->th_seq_num, rch->th_seq_num);
1841
1842 if (rc != 0)
1843 ctcm_ccw_check_rc(wch, rc, "send sweep");
1844
1845done:
1846 return;
1847}
1848
1849
1850/*
1851 * The ctcmpc statemachine for a channel.
1852 */
1853
1854const fsm_node ctcmpc_ch_fsm[] = {
1855 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1856 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1857 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1858 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1859 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1860
1861 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1862 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1863 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1864 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1865 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1866 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1867 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1868 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1869
1870 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1871 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1872 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1873 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1874 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1875 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876
1877 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1878 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1879 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1880 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1881 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1882
1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1885 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1886 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1887 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1888 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1889 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1890 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1891
1892 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1893 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1894 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1895 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1896 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1897 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1898 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1899 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1900 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1901 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1902
1903 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1904 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1905 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1906 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1907 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1908 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1909 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1910 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1911 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1912 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1913
1914 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1915 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1916 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1917 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1918 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1919 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1920 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1921 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1922 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1923 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1924 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1925
1926 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1927 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1928 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1929 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1930 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1931 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1932 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1933 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1934 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1935 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1936 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1937 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1938 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1939
1940 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1941 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1942 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1943 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1944 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1945 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1946 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1947 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1948 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1949 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1950 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1951 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1952
1953 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1954 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1955 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1956 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1957 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1958 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1959 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1960 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1961 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1962 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1963 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1964 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1965
1966 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1967 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1968 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1969 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1970 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1971 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1972 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1973 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1974 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1975 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1976 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1977 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1978
1979 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1980 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1981 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1982 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1983 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1984 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1985 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1986 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1987 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1988 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1989 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1990 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1991
1992 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1993 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1994 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1995 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1996 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1997 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1998 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1999 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2000
2001 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
2002 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
2003 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
2004 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2005 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2006 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2007 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2008 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2009 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2010
2011 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2012 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2013 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2014 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2015 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2016 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2017 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2018 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2019
2020 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2021 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2022 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2023 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2024 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2025 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2026 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2027 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2028
2029 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2030 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2031 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2032 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2033 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2034 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2035 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2036
2037 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2038 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2039 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2040 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2041 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2042 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2043 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2044 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2045 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2046 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2047
2048 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2049 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2050 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2051 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2052 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2053};
2054
2055int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2056
2057/*
2058 * Actions for interface - statemachine.
2059 */
2060
2061/**
2062 * Startup channels by sending CTC_EVENT_START to each channel.
2063 *
2064 * fi An instance of an interface statemachine.
2065 * event The event, just happened.
2066 * arg Generic pointer, casted from struct net_device * upon call.
2067 */
2068static void dev_action_start(fsm_instance *fi, int event, void *arg)
2069{
2070 struct net_device *dev = arg;
2071 struct ctcm_priv *priv = dev->ml_priv;
2072 int direction;
2073
2074 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2075
2076 fsm_deltimer(&priv->restart_timer);
2077 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2078 if (IS_MPC(priv))
2079 priv->mpcg->channels_terminating = 0;
2080 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2081 struct channel *ch = priv->channel[direction];
2082 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2083 }
2084}
2085
2086/**
2087 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2088 *
2089 * fi An instance of an interface statemachine.
2090 * event The event, just happened.
2091 * arg Generic pointer, casted from struct net_device * upon call.
2092 */
2093static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2094{
2095 int direction;
2096 struct net_device *dev = arg;
2097 struct ctcm_priv *priv = dev->ml_priv;
2098
2099 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2100
2101 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2102 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2103 struct channel *ch = priv->channel[direction];
2104 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2105 ch->th_seq_num = 0x00;
2106 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2107 __func__, ch->th_seq_num);
2108 }
2109 if (IS_MPC(priv))
2110 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2111}
2112
2113static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2114{
2115 int restart_timer;
2116 struct net_device *dev = arg;
2117 struct ctcm_priv *priv = dev->ml_priv;
2118
2119 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2120
2121 if (IS_MPC(priv)) {
2122 restart_timer = CTCM_TIME_1_SEC;
2123 } else {
2124 restart_timer = CTCM_TIME_5_SEC;
2125 }
2126 dev_info(&dev->dev, "Restarting device\n");
2127
2128 dev_action_stop(fi, event, arg);
2129 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2130 if (IS_MPC(priv))
2131 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2132
2133 /* going back into start sequence too quickly can */
2134 /* result in the other side becoming unreachable due */
2135 /* to sense reported when IO is aborted */
2136 fsm_addtimer(&priv->restart_timer, restart_timer,
2137 DEV_EVENT_START, dev);
2138}
2139
2140/**
2141 * Called from channel statemachine
2142 * when a channel is up and running.
2143 *
2144 * fi An instance of an interface statemachine.
2145 * event The event, just happened.
2146 * arg Generic pointer, casted from struct net_device * upon call.
2147 */
2148static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2149{
2150 struct net_device *dev = arg;
2151 struct ctcm_priv *priv = dev->ml_priv;
2152 int dev_stat = fsm_getstate(fi);
2153
2154 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2155 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2156 dev->name, dev->ml_priv, dev_stat, event);
2157
2158 switch (fsm_getstate(fi)) {
2159 case DEV_STATE_STARTWAIT_RXTX:
2160 if (event == DEV_EVENT_RXUP)
2161 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2162 else
2163 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2164 break;
2165 case DEV_STATE_STARTWAIT_RX:
2166 if (event == DEV_EVENT_RXUP) {
2167 fsm_newstate(fi, DEV_STATE_RUNNING);
2168 dev_info(&dev->dev,
2169 "Connected with remote side\n");
2170 ctcm_clear_busy(dev);
2171 }
2172 break;
2173 case DEV_STATE_STARTWAIT_TX:
2174 if (event == DEV_EVENT_TXUP) {
2175 fsm_newstate(fi, DEV_STATE_RUNNING);
2176 dev_info(&dev->dev,
2177 "Connected with remote side\n");
2178 ctcm_clear_busy(dev);
2179 }
2180 break;
2181 case DEV_STATE_STOPWAIT_TX:
2182 if (event == DEV_EVENT_RXUP)
2183 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2184 break;
2185 case DEV_STATE_STOPWAIT_RX:
2186 if (event == DEV_EVENT_TXUP)
2187 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188 break;
2189 }
2190
2191 if (IS_MPC(priv)) {
2192 if (event == DEV_EVENT_RXUP)
2193 mpc_channel_action(priv->channel[CTCM_READ],
2194 CTCM_READ, MPC_CHANNEL_ADD);
2195 else
2196 mpc_channel_action(priv->channel[CTCM_WRITE],
2197 CTCM_WRITE, MPC_CHANNEL_ADD);
2198 }
2199}
2200
2201/**
2202 * Called from device statemachine
2203 * when a channel has been shutdown.
2204 *
2205 * fi An instance of an interface statemachine.
2206 * event The event, just happened.
2207 * arg Generic pointer, casted from struct net_device * upon call.
2208 */
2209static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2210{
2211
2212 struct net_device *dev = arg;
2213 struct ctcm_priv *priv = dev->ml_priv;
2214
2215 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2216
2217 switch (fsm_getstate(fi)) {
2218 case DEV_STATE_RUNNING:
2219 if (event == DEV_EVENT_TXDOWN)
2220 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2221 else
2222 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2223 break;
2224 case DEV_STATE_STARTWAIT_RX:
2225 if (event == DEV_EVENT_TXDOWN)
2226 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2227 break;
2228 case DEV_STATE_STARTWAIT_TX:
2229 if (event == DEV_EVENT_RXDOWN)
2230 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231 break;
2232 case DEV_STATE_STOPWAIT_RXTX:
2233 if (event == DEV_EVENT_TXDOWN)
2234 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2235 else
2236 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2237 break;
2238 case DEV_STATE_STOPWAIT_RX:
2239 if (event == DEV_EVENT_RXDOWN)
2240 fsm_newstate(fi, DEV_STATE_STOPPED);
2241 break;
2242 case DEV_STATE_STOPWAIT_TX:
2243 if (event == DEV_EVENT_TXDOWN)
2244 fsm_newstate(fi, DEV_STATE_STOPPED);
2245 break;
2246 }
2247 if (IS_MPC(priv)) {
2248 if (event == DEV_EVENT_RXDOWN)
2249 mpc_channel_action(priv->channel[CTCM_READ],
2250 CTCM_READ, MPC_CHANNEL_REMOVE);
2251 else
2252 mpc_channel_action(priv->channel[CTCM_WRITE],
2253 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2254 }
2255}
2256
2257const fsm_node dev_fsm[] = {
2258 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2259 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2260 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2261 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2262 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2263 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2264 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2265 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2266 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2267 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2268 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2269 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2270 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2271 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2272 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2273 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2274 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2275 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2276 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2277 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2278 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2279 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2280 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2281 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2282 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2283 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2284 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2285 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2286 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2287 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2288 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2289 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2290 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2291 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2292 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2293 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2294 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2295};
2296
2297int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2298
2299/* --- This is the END my friend --- */
2300