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1/*
2 * Copyright IBM Corp. 2001, 2007
3 * Authors: Fritz Elfert (felfert@millenux.com)
4 * Peter Tiedemann (ptiedem@de.ibm.com)
5 * MPC additions :
6 * Belinda Thompson (belindat@us.ibm.com)
7 * Andy Richter (richtera@us.ibm.com)
8 */
9
10#undef DEBUG
11#undef DEBUGDATA
12#undef DEBUGCCW
13
14#define KMSG_COMPONENT "ctcm"
15#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
16
17#include <linux/module.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/slab.h>
21#include <linux/errno.h>
22#include <linux/types.h>
23#include <linux/interrupt.h>
24#include <linux/timer.h>
25#include <linux/bitops.h>
26
27#include <linux/signal.h>
28#include <linux/string.h>
29
30#include <linux/ip.h>
31#include <linux/if_arp.h>
32#include <linux/tcp.h>
33#include <linux/skbuff.h>
34#include <linux/ctype.h>
35#include <net/dst.h>
36
37#include <linux/io.h>
38#include <asm/ccwdev.h>
39#include <asm/ccwgroup.h>
40#include <linux/uaccess.h>
41
42#include <asm/idals.h>
43
44#include "fsm.h"
45
46#include "ctcm_dbug.h"
47#include "ctcm_main.h"
48#include "ctcm_fsms.h"
49
50const char *dev_state_names[] = {
51 [DEV_STATE_STOPPED] = "Stopped",
52 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
53 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
54 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
55 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
56 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
57 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
58 [DEV_STATE_RUNNING] = "Running",
59};
60
61const char *dev_event_names[] = {
62 [DEV_EVENT_START] = "Start",
63 [DEV_EVENT_STOP] = "Stop",
64 [DEV_EVENT_RXUP] = "RX up",
65 [DEV_EVENT_TXUP] = "TX up",
66 [DEV_EVENT_RXDOWN] = "RX down",
67 [DEV_EVENT_TXDOWN] = "TX down",
68 [DEV_EVENT_RESTART] = "Restart",
69};
70
71const char *ctc_ch_event_names[] = {
72 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
73 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
74 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
75 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
76 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
77 [CTC_EVENT_ATTN] = "Status ATTN",
78 [CTC_EVENT_BUSY] = "Status BUSY",
79 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
80 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
81 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
82 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
83 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
84 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
85 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
86 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
87 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
88 [CTC_EVENT_MC_FAIL] = "Machine check failure",
89 [CTC_EVENT_MC_GOOD] = "Machine check operational",
90 [CTC_EVENT_IRQ] = "IRQ normal",
91 [CTC_EVENT_FINSTAT] = "IRQ final",
92 [CTC_EVENT_TIMER] = "Timer",
93 [CTC_EVENT_START] = "Start",
94 [CTC_EVENT_STOP] = "Stop",
95 /*
96 * additional MPC events
97 */
98 [CTC_EVENT_SEND_XID] = "XID Exchange",
99 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
100};
101
102const char *ctc_ch_state_names[] = {
103 [CTC_STATE_IDLE] = "Idle",
104 [CTC_STATE_STOPPED] = "Stopped",
105 [CTC_STATE_STARTWAIT] = "StartWait",
106 [CTC_STATE_STARTRETRY] = "StartRetry",
107 [CTC_STATE_SETUPWAIT] = "SetupWait",
108 [CTC_STATE_RXINIT] = "RX init",
109 [CTC_STATE_TXINIT] = "TX init",
110 [CTC_STATE_RX] = "RX",
111 [CTC_STATE_TX] = "TX",
112 [CTC_STATE_RXIDLE] = "RX idle",
113 [CTC_STATE_TXIDLE] = "TX idle",
114 [CTC_STATE_RXERR] = "RX error",
115 [CTC_STATE_TXERR] = "TX error",
116 [CTC_STATE_TERM] = "Terminating",
117 [CTC_STATE_DTERM] = "Restarting",
118 [CTC_STATE_NOTOP] = "Not operational",
119 /*
120 * additional MPC states
121 */
122 [CH_XID0_PENDING] = "Pending XID0 Start",
123 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
124 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
125 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
126 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
127 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
128 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
129};
130
131static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
132
133/*
134 * ----- static ctcm actions for channel statemachine -----
135 *
136*/
137static void chx_txdone(fsm_instance *fi, int event, void *arg);
138static void chx_rx(fsm_instance *fi, int event, void *arg);
139static void chx_rxidle(fsm_instance *fi, int event, void *arg);
140static void chx_firstio(fsm_instance *fi, int event, void *arg);
141static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
142static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
143static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
144static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
145static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
146static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
147static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
148static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
149static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
150static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
151static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
152static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
153static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
154static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
155
156/*
157 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
158 *
159*/
160static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
161static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
162static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
163/* shared :
164static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
165static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
166static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
167static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
168static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
169static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
170static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
171static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
172static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
173static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
174static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
175static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
176static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
177static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
178*/
179static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
180static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
181static void ctcmpc_chx_resend(fsm_instance *, int, void *);
182static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
183
184/**
185 * Check return code of a preceding ccw_device call, halt_IO etc...
186 *
187 * ch : The channel, the error belongs to.
188 * Returns the error code (!= 0) to inspect.
189 */
190void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
191{
192 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
193 "%s(%s): %s: %04x\n",
194 CTCM_FUNTAIL, ch->id, msg, rc);
195 switch (rc) {
196 case -EBUSY:
197 pr_info("%s: The communication peer is busy\n",
198 ch->id);
199 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
200 break;
201 case -ENODEV:
202 pr_err("%s: The specified target device is not valid\n",
203 ch->id);
204 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
205 break;
206 default:
207 pr_err("An I/O operation resulted in error %04x\n",
208 rc);
209 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
210 }
211}
212
213void ctcm_purge_skb_queue(struct sk_buff_head *q)
214{
215 struct sk_buff *skb;
216
217 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
218
219 while ((skb = skb_dequeue(q))) {
220 atomic_dec(&skb->users);
221 dev_kfree_skb_any(skb);
222 }
223}
224
225/**
226 * NOP action for statemachines
227 */
228static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
229{
230}
231
232/*
233 * Actions for channel - statemachines.
234 */
235
236/**
237 * Normal data has been send. Free the corresponding
238 * skb (it's in io_queue), reset dev->tbusy and
239 * revert to idle state.
240 *
241 * fi An instance of a channel statemachine.
242 * event The event, just happened.
243 * arg Generic pointer, casted from channel * upon call.
244 */
245static void chx_txdone(fsm_instance *fi, int event, void *arg)
246{
247 struct channel *ch = arg;
248 struct net_device *dev = ch->netdev;
249 struct ctcm_priv *priv = dev->ml_priv;
250 struct sk_buff *skb;
251 int first = 1;
252 int i;
253 unsigned long duration;
254 struct timespec done_stamp = current_kernel_time(); /* xtime */
255
256 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
257
258 duration =
259 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
260 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
261 if (duration > ch->prof.tx_time)
262 ch->prof.tx_time = duration;
263
264 if (ch->irb->scsw.cmd.count != 0)
265 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
266 "%s(%s): TX not complete, remaining %d bytes",
267 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
268 fsm_deltimer(&ch->timer);
269 while ((skb = skb_dequeue(&ch->io_queue))) {
270 priv->stats.tx_packets++;
271 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
272 if (first) {
273 priv->stats.tx_bytes += 2;
274 first = 0;
275 }
276 atomic_dec(&skb->users);
277 dev_kfree_skb_irq(skb);
278 }
279 spin_lock(&ch->collect_lock);
280 clear_normalized_cda(&ch->ccw[4]);
281 if (ch->collect_len > 0) {
282 int rc;
283
284 if (ctcm_checkalloc_buffer(ch)) {
285 spin_unlock(&ch->collect_lock);
286 return;
287 }
288 ch->trans_skb->data = ch->trans_skb_data;
289 skb_reset_tail_pointer(ch->trans_skb);
290 ch->trans_skb->len = 0;
291 if (ch->prof.maxmulti < (ch->collect_len + 2))
292 ch->prof.maxmulti = ch->collect_len + 2;
293 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
294 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
295 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
296 i = 0;
297 while ((skb = skb_dequeue(&ch->collect_queue))) {
298 skb_copy_from_linear_data(skb,
299 skb_put(ch->trans_skb, skb->len), skb->len);
300 priv->stats.tx_packets++;
301 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
302 atomic_dec(&skb->users);
303 dev_kfree_skb_irq(skb);
304 i++;
305 }
306 ch->collect_len = 0;
307 spin_unlock(&ch->collect_lock);
308 ch->ccw[1].count = ch->trans_skb->len;
309 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
310 ch->prof.send_stamp = current_kernel_time(); /* xtime */
311 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
312 (unsigned long)ch, 0xff, 0);
313 ch->prof.doios_multi++;
314 if (rc != 0) {
315 priv->stats.tx_dropped += i;
316 priv->stats.tx_errors += i;
317 fsm_deltimer(&ch->timer);
318 ctcm_ccw_check_rc(ch, rc, "chained TX");
319 }
320 } else {
321 spin_unlock(&ch->collect_lock);
322 fsm_newstate(fi, CTC_STATE_TXIDLE);
323 }
324 ctcm_clear_busy_do(dev);
325}
326
327/**
328 * Initial data is sent.
329 * Notify device statemachine that we are up and
330 * running.
331 *
332 * fi An instance of a channel statemachine.
333 * event The event, just happened.
334 * arg Generic pointer, casted from channel * upon call.
335 */
336void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
337{
338 struct channel *ch = arg;
339 struct net_device *dev = ch->netdev;
340 struct ctcm_priv *priv = dev->ml_priv;
341
342 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
343
344 fsm_deltimer(&ch->timer);
345 fsm_newstate(fi, CTC_STATE_TXIDLE);
346 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
347}
348
349/**
350 * Got normal data, check for sanity, queue it up, allocate new buffer
351 * trigger bottom half, and initiate next read.
352 *
353 * fi An instance of a channel statemachine.
354 * event The event, just happened.
355 * arg Generic pointer, casted from channel * upon call.
356 */
357static void chx_rx(fsm_instance *fi, int event, void *arg)
358{
359 struct channel *ch = arg;
360 struct net_device *dev = ch->netdev;
361 struct ctcm_priv *priv = dev->ml_priv;
362 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
363 struct sk_buff *skb = ch->trans_skb;
364 __u16 block_len = *((__u16 *)skb->data);
365 int check_len;
366 int rc;
367
368 fsm_deltimer(&ch->timer);
369 if (len < 8) {
370 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
371 "%s(%s): got packet with length %d < 8\n",
372 CTCM_FUNTAIL, dev->name, len);
373 priv->stats.rx_dropped++;
374 priv->stats.rx_length_errors++;
375 goto again;
376 }
377 if (len > ch->max_bufsize) {
378 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
379 "%s(%s): got packet with length %d > %d\n",
380 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
381 priv->stats.rx_dropped++;
382 priv->stats.rx_length_errors++;
383 goto again;
384 }
385
386 /*
387 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
388 */
389 switch (ch->protocol) {
390 case CTCM_PROTO_S390:
391 case CTCM_PROTO_OS390:
392 check_len = block_len + 2;
393 break;
394 default:
395 check_len = block_len;
396 break;
397 }
398 if ((len < block_len) || (len > check_len)) {
399 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
400 "%s(%s): got block length %d != rx length %d\n",
401 CTCM_FUNTAIL, dev->name, block_len, len);
402 if (do_debug)
403 ctcmpc_dump_skb(skb, 0);
404
405 *((__u16 *)skb->data) = len;
406 priv->stats.rx_dropped++;
407 priv->stats.rx_length_errors++;
408 goto again;
409 }
410 if (block_len > 2) {
411 *((__u16 *)skb->data) = block_len - 2;
412 ctcm_unpack_skb(ch, skb);
413 }
414 again:
415 skb->data = ch->trans_skb_data;
416 skb_reset_tail_pointer(skb);
417 skb->len = 0;
418 if (ctcm_checkalloc_buffer(ch))
419 return;
420 ch->ccw[1].count = ch->max_bufsize;
421 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
422 (unsigned long)ch, 0xff, 0);
423 if (rc != 0)
424 ctcm_ccw_check_rc(ch, rc, "normal RX");
425}
426
427/**
428 * Initialize connection by sending a __u16 of value 0.
429 *
430 * fi An instance of a channel statemachine.
431 * event The event, just happened.
432 * arg Generic pointer, casted from channel * upon call.
433 */
434static void chx_firstio(fsm_instance *fi, int event, void *arg)
435{
436 int rc;
437 struct channel *ch = arg;
438 int fsmstate = fsm_getstate(fi);
439
440 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
441 "%s(%s) : %02x",
442 CTCM_FUNTAIL, ch->id, fsmstate);
443
444 ch->sense_rc = 0; /* reset unit check report control */
445 if (fsmstate == CTC_STATE_TXIDLE)
446 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
447 "%s(%s): remote side issued READ?, init.\n",
448 CTCM_FUNTAIL, ch->id);
449 fsm_deltimer(&ch->timer);
450 if (ctcm_checkalloc_buffer(ch))
451 return;
452 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
453 (ch->protocol == CTCM_PROTO_OS390)) {
454 /* OS/390 resp. z/OS */
455 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
456 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
457 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
458 CTC_EVENT_TIMER, ch);
459 chx_rxidle(fi, event, arg);
460 } else {
461 struct net_device *dev = ch->netdev;
462 struct ctcm_priv *priv = dev->ml_priv;
463 fsm_newstate(fi, CTC_STATE_TXIDLE);
464 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
465 }
466 return;
467 }
468 /*
469 * Don't setup a timer for receiving the initial RX frame
470 * if in compatibility mode, since VM TCP delays the initial
471 * frame until it has some data to send.
472 */
473 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
474 (ch->protocol != CTCM_PROTO_S390))
475 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
476
477 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
478 ch->ccw[1].count = 2; /* Transfer only length */
479
480 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
481 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
482 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
483 (unsigned long)ch, 0xff, 0);
484 if (rc != 0) {
485 fsm_deltimer(&ch->timer);
486 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
487 ctcm_ccw_check_rc(ch, rc, "init IO");
488 }
489 /*
490 * If in compatibility mode since we don't setup a timer, we
491 * also signal RX channel up immediately. This enables us
492 * to send packets early which in turn usually triggers some
493 * reply from VM TCP which brings up the RX channel to it's
494 * final state.
495 */
496 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
497 (ch->protocol == CTCM_PROTO_S390)) {
498 struct net_device *dev = ch->netdev;
499 struct ctcm_priv *priv = dev->ml_priv;
500 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
501 }
502}
503
504/**
505 * Got initial data, check it. If OK,
506 * notify device statemachine that we are up and
507 * running.
508 *
509 * fi An instance of a channel statemachine.
510 * event The event, just happened.
511 * arg Generic pointer, casted from channel * upon call.
512 */
513static void chx_rxidle(fsm_instance *fi, int event, void *arg)
514{
515 struct channel *ch = arg;
516 struct net_device *dev = ch->netdev;
517 struct ctcm_priv *priv = dev->ml_priv;
518 __u16 buflen;
519 int rc;
520
521 fsm_deltimer(&ch->timer);
522 buflen = *((__u16 *)ch->trans_skb->data);
523 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
524 __func__, dev->name, buflen);
525
526 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
527 if (ctcm_checkalloc_buffer(ch))
528 return;
529 ch->ccw[1].count = ch->max_bufsize;
530 fsm_newstate(fi, CTC_STATE_RXIDLE);
531 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
532 (unsigned long)ch, 0xff, 0);
533 if (rc != 0) {
534 fsm_newstate(fi, CTC_STATE_RXINIT);
535 ctcm_ccw_check_rc(ch, rc, "initial RX");
536 } else
537 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
538 } else {
539 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
540 __func__, dev->name,
541 buflen, CTCM_INITIAL_BLOCKLEN);
542 chx_firstio(fi, event, arg);
543 }
544}
545
546/**
547 * Set channel into extended mode.
548 *
549 * fi An instance of a channel statemachine.
550 * event The event, just happened.
551 * arg Generic pointer, casted from channel * upon call.
552 */
553static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
554{
555 struct channel *ch = arg;
556 int rc;
557 unsigned long saveflags = 0;
558 int timeout = CTCM_TIME_5_SEC;
559
560 fsm_deltimer(&ch->timer);
561 if (IS_MPC(ch)) {
562 timeout = 1500;
563 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
564 __func__, smp_processor_id(), ch, ch->id);
565 }
566 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
567 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
568 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
569
570 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
572 /* Such conditional locking is undeterministic in
573 * static view. => ignore sparse warnings here. */
574
575 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
576 (unsigned long)ch, 0xff, 0);
577 if (event == CTC_EVENT_TIMER) /* see above comments */
578 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
579 if (rc != 0) {
580 fsm_deltimer(&ch->timer);
581 fsm_newstate(fi, CTC_STATE_STARTWAIT);
582 ctcm_ccw_check_rc(ch, rc, "set Mode");
583 } else
584 ch->retry = 0;
585}
586
587/**
588 * Setup channel.
589 *
590 * fi An instance of a channel statemachine.
591 * event The event, just happened.
592 * arg Generic pointer, casted from channel * upon call.
593 */
594static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
595{
596 struct channel *ch = arg;
597 unsigned long saveflags;
598 int rc;
599
600 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
601 CTCM_FUNTAIL, ch->id,
602 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
603
604 if (ch->trans_skb != NULL) {
605 clear_normalized_cda(&ch->ccw[1]);
606 dev_kfree_skb(ch->trans_skb);
607 ch->trans_skb = NULL;
608 }
609 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
610 ch->ccw[1].cmd_code = CCW_CMD_READ;
611 ch->ccw[1].flags = CCW_FLAG_SLI;
612 ch->ccw[1].count = 0;
613 } else {
614 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
615 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
616 ch->ccw[1].count = 0;
617 }
618 if (ctcm_checkalloc_buffer(ch)) {
619 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
620 "%s(%s): %s trans_skb alloc delayed "
621 "until first transfer",
622 CTCM_FUNTAIL, ch->id,
623 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
624 "RX" : "TX");
625 }
626 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
627 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
628 ch->ccw[0].count = 0;
629 ch->ccw[0].cda = 0;
630 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
631 ch->ccw[2].flags = CCW_FLAG_SLI;
632 ch->ccw[2].count = 0;
633 ch->ccw[2].cda = 0;
634 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
635 ch->ccw[4].cda = 0;
636 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
637
638 fsm_newstate(fi, CTC_STATE_STARTWAIT);
639 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
640 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
641 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
642 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
643 if (rc != 0) {
644 if (rc != -EBUSY)
645 fsm_deltimer(&ch->timer);
646 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
647 }
648}
649
650/**
651 * Shutdown a channel.
652 *
653 * fi An instance of a channel statemachine.
654 * event The event, just happened.
655 * arg Generic pointer, casted from channel * upon call.
656 */
657static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
658{
659 struct channel *ch = arg;
660 unsigned long saveflags = 0;
661 int rc;
662 int oldstate;
663
664 fsm_deltimer(&ch->timer);
665 if (IS_MPC(ch))
666 fsm_deltimer(&ch->sweep_timer);
667
668 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
669
670 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
671 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
672 /* Such conditional locking is undeterministic in
673 * static view. => ignore sparse warnings here. */
674 oldstate = fsm_getstate(fi);
675 fsm_newstate(fi, CTC_STATE_TERM);
676 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
677
678 if (event == CTC_EVENT_STOP)
679 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
680 /* see remark above about conditional locking */
681
682 if (rc != 0 && rc != -EBUSY) {
683 fsm_deltimer(&ch->timer);
684 if (event != CTC_EVENT_STOP) {
685 fsm_newstate(fi, oldstate);
686 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
687 }
688 }
689}
690
691/**
692 * Cleanup helper for chx_fail and chx_stopped
693 * cleanup channels queue and notify interface statemachine.
694 *
695 * fi An instance of a channel statemachine.
696 * state The next state (depending on caller).
697 * ch The channel to operate on.
698 */
699static void ctcm_chx_cleanup(fsm_instance *fi, int state,
700 struct channel *ch)
701{
702 struct net_device *dev = ch->netdev;
703 struct ctcm_priv *priv = dev->ml_priv;
704
705 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
706 "%s(%s): %s[%d]\n",
707 CTCM_FUNTAIL, dev->name, ch->id, state);
708
709 fsm_deltimer(&ch->timer);
710 if (IS_MPC(ch))
711 fsm_deltimer(&ch->sweep_timer);
712
713 fsm_newstate(fi, state);
714 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
715 clear_normalized_cda(&ch->ccw[1]);
716 dev_kfree_skb_any(ch->trans_skb);
717 ch->trans_skb = NULL;
718 }
719
720 ch->th_seg = 0x00;
721 ch->th_seq_num = 0x00;
722 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
723 skb_queue_purge(&ch->io_queue);
724 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
725 } else {
726 ctcm_purge_skb_queue(&ch->io_queue);
727 if (IS_MPC(ch))
728 ctcm_purge_skb_queue(&ch->sweep_queue);
729 spin_lock(&ch->collect_lock);
730 ctcm_purge_skb_queue(&ch->collect_queue);
731 ch->collect_len = 0;
732 spin_unlock(&ch->collect_lock);
733 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
734 }
735}
736
737/**
738 * A channel has successfully been halted.
739 * Cleanup it's queue and notify interface statemachine.
740 *
741 * fi An instance of a channel statemachine.
742 * event The event, just happened.
743 * arg Generic pointer, casted from channel * upon call.
744 */
745static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
746{
747 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
748}
749
750/**
751 * A stop command from device statemachine arrived and we are in
752 * not operational mode. Set state to stopped.
753 *
754 * fi An instance of a channel statemachine.
755 * event The event, just happened.
756 * arg Generic pointer, casted from channel * upon call.
757 */
758static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
759{
760 fsm_newstate(fi, CTC_STATE_STOPPED);
761}
762
763/**
764 * A machine check for no path, not operational status or gone device has
765 * happened.
766 * Cleanup queue and notify interface statemachine.
767 *
768 * fi An instance of a channel statemachine.
769 * event The event, just happened.
770 * arg Generic pointer, casted from channel * upon call.
771 */
772static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
773{
774 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
775}
776
777/**
778 * Handle error during setup of channel.
779 *
780 * fi An instance of a channel statemachine.
781 * event The event, just happened.
782 * arg Generic pointer, casted from channel * upon call.
783 */
784static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
785{
786 struct channel *ch = arg;
787 struct net_device *dev = ch->netdev;
788 struct ctcm_priv *priv = dev->ml_priv;
789
790 /*
791 * Special case: Got UC_RCRESET on setmode.
792 * This means that remote side isn't setup. In this case
793 * simply retry after some 10 secs...
794 */
795 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
796 ((event == CTC_EVENT_UC_RCRESET) ||
797 (event == CTC_EVENT_UC_RSRESET))) {
798 fsm_newstate(fi, CTC_STATE_STARTRETRY);
799 fsm_deltimer(&ch->timer);
800 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
801 if (!IS_MPC(ch) &&
802 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
803 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
804 if (rc != 0)
805 ctcm_ccw_check_rc(ch, rc,
806 "HaltIO in chx_setuperr");
807 }
808 return;
809 }
810
811 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
812 "%s(%s) : %s error during %s channel setup state=%s\n",
813 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
814 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
815 fsm_getstate_str(fi));
816
817 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
818 fsm_newstate(fi, CTC_STATE_RXERR);
819 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
820 } else {
821 fsm_newstate(fi, CTC_STATE_TXERR);
822 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
823 }
824}
825
826/**
827 * Restart a channel after an error.
828 *
829 * fi An instance of a channel statemachine.
830 * event The event, just happened.
831 * arg Generic pointer, casted from channel * upon call.
832 */
833static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
834{
835 struct channel *ch = arg;
836 struct net_device *dev = ch->netdev;
837 unsigned long saveflags = 0;
838 int oldstate;
839 int rc;
840
841 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
842 "%s: %s[%d] of %s\n",
843 CTCM_FUNTAIL, ch->id, event, dev->name);
844
845 fsm_deltimer(&ch->timer);
846
847 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
848 oldstate = fsm_getstate(fi);
849 fsm_newstate(fi, CTC_STATE_STARTWAIT);
850 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
851 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
852 /* Such conditional locking is a known problem for
853 * sparse because its undeterministic in static view.
854 * Warnings should be ignored here. */
855 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
856 if (event == CTC_EVENT_TIMER)
857 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
858 if (rc != 0) {
859 if (rc != -EBUSY) {
860 fsm_deltimer(&ch->timer);
861 fsm_newstate(fi, oldstate);
862 }
863 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
864 }
865}
866
867/**
868 * Handle error during RX initial handshake (exchange of
869 * 0-length block header)
870 *
871 * fi An instance of a channel statemachine.
872 * event The event, just happened.
873 * arg Generic pointer, casted from channel * upon call.
874 */
875static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
876{
877 struct channel *ch = arg;
878 struct net_device *dev = ch->netdev;
879 struct ctcm_priv *priv = dev->ml_priv;
880
881 if (event == CTC_EVENT_TIMER) {
882 if (!IS_MPCDEV(dev))
883 /* TODO : check if MPC deletes timer somewhere */
884 fsm_deltimer(&ch->timer);
885 if (ch->retry++ < 3)
886 ctcm_chx_restart(fi, event, arg);
887 else {
888 fsm_newstate(fi, CTC_STATE_RXERR);
889 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
890 }
891 } else {
892 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
893 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
894 ctc_ch_event_names[event], fsm_getstate_str(fi));
895
896 dev_warn(&dev->dev,
897 "Initialization failed with RX/TX init handshake "
898 "error %s\n", ctc_ch_event_names[event]);
899 }
900}
901
902/**
903 * Notify device statemachine if we gave up initialization
904 * of RX channel.
905 *
906 * fi An instance of a channel statemachine.
907 * event The event, just happened.
908 * arg Generic pointer, casted from channel * upon call.
909 */
910static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
911{
912 struct channel *ch = arg;
913 struct net_device *dev = ch->netdev;
914 struct ctcm_priv *priv = dev->ml_priv;
915
916 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
917 "%s(%s): RX %s busy, init. fail",
918 CTCM_FUNTAIL, dev->name, ch->id);
919 fsm_newstate(fi, CTC_STATE_RXERR);
920 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
921}
922
923/**
924 * Handle RX Unit check remote reset (remote disconnected)
925 *
926 * fi An instance of a channel statemachine.
927 * event The event, just happened.
928 * arg Generic pointer, casted from channel * upon call.
929 */
930static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
931{
932 struct channel *ch = arg;
933 struct channel *ch2;
934 struct net_device *dev = ch->netdev;
935 struct ctcm_priv *priv = dev->ml_priv;
936
937 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
938 "%s: %s: remote disconnect - re-init ...",
939 CTCM_FUNTAIL, dev->name);
940 fsm_deltimer(&ch->timer);
941 /*
942 * Notify device statemachine
943 */
944 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
945 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
946
947 fsm_newstate(fi, CTC_STATE_DTERM);
948 ch2 = priv->channel[CTCM_WRITE];
949 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
950
951 ccw_device_halt(ch->cdev, (unsigned long)ch);
952 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
953}
954
955/**
956 * Handle error during TX channel initialization.
957 *
958 * fi An instance of a channel statemachine.
959 * event The event, just happened.
960 * arg Generic pointer, casted from channel * upon call.
961 */
962static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
963{
964 struct channel *ch = arg;
965 struct net_device *dev = ch->netdev;
966 struct ctcm_priv *priv = dev->ml_priv;
967
968 if (event == CTC_EVENT_TIMER) {
969 fsm_deltimer(&ch->timer);
970 if (ch->retry++ < 3)
971 ctcm_chx_restart(fi, event, arg);
972 else {
973 fsm_newstate(fi, CTC_STATE_TXERR);
974 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
975 }
976 } else {
977 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
978 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
979 ctc_ch_event_names[event], fsm_getstate_str(fi));
980
981 dev_warn(&dev->dev,
982 "Initialization failed with RX/TX init handshake "
983 "error %s\n", ctc_ch_event_names[event]);
984 }
985}
986
987/**
988 * Handle TX timeout by retrying operation.
989 *
990 * fi An instance of a channel statemachine.
991 * event The event, just happened.
992 * arg Generic pointer, casted from channel * upon call.
993 */
994static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
995{
996 struct channel *ch = arg;
997 struct net_device *dev = ch->netdev;
998 struct ctcm_priv *priv = dev->ml_priv;
999 struct sk_buff *skb;
1000
1001 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1002 __func__, smp_processor_id(), ch, ch->id);
1003
1004 fsm_deltimer(&ch->timer);
1005 if (ch->retry++ > 3) {
1006 struct mpc_group *gptr = priv->mpcg;
1007 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1008 "%s: %s: retries exceeded",
1009 CTCM_FUNTAIL, ch->id);
1010 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1011 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1012 use gptr as mpc indicator */
1013 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1014 ctcm_chx_restart(fi, event, arg);
1015 goto done;
1016 }
1017
1018 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1019 "%s : %s: retry %d",
1020 CTCM_FUNTAIL, ch->id, ch->retry);
1021 skb = skb_peek(&ch->io_queue);
1022 if (skb) {
1023 int rc = 0;
1024 unsigned long saveflags = 0;
1025 clear_normalized_cda(&ch->ccw[4]);
1026 ch->ccw[4].count = skb->len;
1027 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1028 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1029 "%s: %s: IDAL alloc failed",
1030 CTCM_FUNTAIL, ch->id);
1031 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1032 ctcm_chx_restart(fi, event, arg);
1033 goto done;
1034 }
1035 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1036 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1037 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1038 /* Such conditional locking is a known problem for
1039 * sparse because its undeterministic in static view.
1040 * Warnings should be ignored here. */
1041 if (do_debug_ccw)
1042 ctcmpc_dumpit((char *)&ch->ccw[3],
1043 sizeof(struct ccw1) * 3);
1044
1045 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1046 (unsigned long)ch, 0xff, 0);
1047 if (event == CTC_EVENT_TIMER)
1048 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1049 saveflags);
1050 if (rc != 0) {
1051 fsm_deltimer(&ch->timer);
1052 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1053 ctcm_purge_skb_queue(&ch->io_queue);
1054 }
1055 }
1056done:
1057 return;
1058}
1059
1060/**
1061 * Handle fatal errors during an I/O command.
1062 *
1063 * fi An instance of a channel statemachine.
1064 * event The event, just happened.
1065 * arg Generic pointer, casted from channel * upon call.
1066 */
1067static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1068{
1069 struct channel *ch = arg;
1070 struct net_device *dev = ch->netdev;
1071 struct ctcm_priv *priv = dev->ml_priv;
1072 int rd = CHANNEL_DIRECTION(ch->flags);
1073
1074 fsm_deltimer(&ch->timer);
1075 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1076 "%s: %s: %s unrecoverable channel error",
1077 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1078
1079 if (IS_MPC(ch)) {
1080 priv->stats.tx_dropped++;
1081 priv->stats.tx_errors++;
1082 }
1083 if (rd == CTCM_READ) {
1084 fsm_newstate(fi, CTC_STATE_RXERR);
1085 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1086 } else {
1087 fsm_newstate(fi, CTC_STATE_TXERR);
1088 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1089 }
1090}
1091
1092/*
1093 * The ctcm statemachine for a channel.
1094 */
1095const fsm_node ch_fsm[] = {
1096 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1097 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1098 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1099 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1100
1101 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1102 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1103 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1104 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1105 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1106
1107 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1108 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1109 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1110 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1111 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1112 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1113
1114 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1115 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1116 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1117 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1118
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1126 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1127
1128 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1129 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1130 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1131 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1132 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1133 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1134 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1135 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1136 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1137 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1138
1139 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1140 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1141 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1142 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1143 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1144 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1145 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1146
1147 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1148 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1149 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1150 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1151 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1152 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1153 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1154 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1155
1156 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1157 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1158 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1159 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1160 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1161 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1162 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1163
1164 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1165 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1166 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1167 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1168 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1169 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1170
1171 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1172 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1173 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1174 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1175 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1176 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1177
1178 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1179 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1180 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1181 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1182 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1183 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1184 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1185 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1186
1187 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1188 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1189 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1190 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1191};
1192
1193int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1194
1195/*
1196 * MPC actions for mpc channel statemachine
1197 * handling of MPC protocol requires extra
1198 * statemachine and actions which are prefixed ctcmpc_ .
1199 * The ctc_ch_states and ctc_ch_state_names,
1200 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1201 * which are expanded by some elements.
1202 */
1203
1204/*
1205 * Actions for mpc channel statemachine.
1206 */
1207
1208/**
1209 * Normal data has been send. Free the corresponding
1210 * skb (it's in io_queue), reset dev->tbusy and
1211 * revert to idle state.
1212 *
1213 * fi An instance of a channel statemachine.
1214 * event The event, just happened.
1215 * arg Generic pointer, casted from channel * upon call.
1216 */
1217static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1218{
1219 struct channel *ch = arg;
1220 struct net_device *dev = ch->netdev;
1221 struct ctcm_priv *priv = dev->ml_priv;
1222 struct mpc_group *grp = priv->mpcg;
1223 struct sk_buff *skb;
1224 int first = 1;
1225 int i;
1226 __u32 data_space;
1227 unsigned long duration;
1228 struct sk_buff *peekskb;
1229 int rc;
1230 struct th_header *header;
1231 struct pdu *p_header;
1232 struct timespec done_stamp = current_kernel_time(); /* xtime */
1233
1234 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1235 __func__, dev->name, smp_processor_id());
1236
1237 duration =
1238 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1239 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1240 if (duration > ch->prof.tx_time)
1241 ch->prof.tx_time = duration;
1242
1243 if (ch->irb->scsw.cmd.count != 0)
1244 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1245 "%s(%s): TX not complete, remaining %d bytes",
1246 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1247 fsm_deltimer(&ch->timer);
1248 while ((skb = skb_dequeue(&ch->io_queue))) {
1249 priv->stats.tx_packets++;
1250 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1251 if (first) {
1252 priv->stats.tx_bytes += 2;
1253 first = 0;
1254 }
1255 atomic_dec(&skb->users);
1256 dev_kfree_skb_irq(skb);
1257 }
1258 spin_lock(&ch->collect_lock);
1259 clear_normalized_cda(&ch->ccw[4]);
1260 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1261 spin_unlock(&ch->collect_lock);
1262 fsm_newstate(fi, CTC_STATE_TXIDLE);
1263 goto done;
1264 }
1265
1266 if (ctcm_checkalloc_buffer(ch)) {
1267 spin_unlock(&ch->collect_lock);
1268 goto done;
1269 }
1270 ch->trans_skb->data = ch->trans_skb_data;
1271 skb_reset_tail_pointer(ch->trans_skb);
1272 ch->trans_skb->len = 0;
1273 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1274 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1275 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1276 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1277 i = 0;
1278 p_header = NULL;
1279 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1280
1281 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1282 " data_space:%04x\n",
1283 __func__, data_space);
1284
1285 while ((skb = skb_dequeue(&ch->collect_queue))) {
1286 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1287 p_header = (struct pdu *)
1288 (skb_tail_pointer(ch->trans_skb) - skb->len);
1289 p_header->pdu_flag = 0x00;
1290 if (skb->protocol == ntohs(ETH_P_SNAP))
1291 p_header->pdu_flag |= 0x60;
1292 else
1293 p_header->pdu_flag |= 0x20;
1294
1295 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1296 __func__, ch->trans_skb->len);
1297 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1298 " to 32 bytes sent to vtam\n", __func__);
1299 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1300
1301 ch->collect_len -= skb->len;
1302 data_space -= skb->len;
1303 priv->stats.tx_packets++;
1304 priv->stats.tx_bytes += skb->len;
1305 atomic_dec(&skb->users);
1306 dev_kfree_skb_any(skb);
1307 peekskb = skb_peek(&ch->collect_queue);
1308 if (peekskb->len > data_space)
1309 break;
1310 i++;
1311 }
1312 /* p_header points to the last one we handled */
1313 if (p_header)
1314 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1315 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1316 if (!header) {
1317 spin_unlock(&ch->collect_lock);
1318 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1319 goto done;
1320 }
1321 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1322 ch->th_seq_num++;
1323 header->th_seq_num = ch->th_seq_num;
1324
1325 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1326 __func__, ch->th_seq_num);
1327
1328 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1329 TH_HEADER_LENGTH); /* put the TH on the packet */
1330
1331 kfree(header);
1332
1333 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1334 __func__, ch->trans_skb->len);
1335 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1336 "data to vtam from collect_q\n", __func__);
1337 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1338 min_t(int, ch->trans_skb->len, 50));
1339
1340 spin_unlock(&ch->collect_lock);
1341 clear_normalized_cda(&ch->ccw[1]);
1342
1343 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1344 (void *)(unsigned long)ch->ccw[1].cda,
1345 ch->trans_skb->data);
1346 ch->ccw[1].count = ch->max_bufsize;
1347
1348 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1349 dev_kfree_skb_any(ch->trans_skb);
1350 ch->trans_skb = NULL;
1351 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1352 "%s: %s: IDAL alloc failed",
1353 CTCM_FUNTAIL, ch->id);
1354 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1355 return;
1356 }
1357
1358 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1359 (void *)(unsigned long)ch->ccw[1].cda,
1360 ch->trans_skb->data);
1361
1362 ch->ccw[1].count = ch->trans_skb->len;
1363 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1364 ch->prof.send_stamp = current_kernel_time(); /* xtime */
1365 if (do_debug_ccw)
1366 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1367 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1368 (unsigned long)ch, 0xff, 0);
1369 ch->prof.doios_multi++;
1370 if (rc != 0) {
1371 priv->stats.tx_dropped += i;
1372 priv->stats.tx_errors += i;
1373 fsm_deltimer(&ch->timer);
1374 ctcm_ccw_check_rc(ch, rc, "chained TX");
1375 }
1376done:
1377 ctcm_clear_busy(dev);
1378 return;
1379}
1380
1381/**
1382 * Got normal data, check for sanity, queue it up, allocate new buffer
1383 * trigger bottom half, and initiate next read.
1384 *
1385 * fi An instance of a channel statemachine.
1386 * event The event, just happened.
1387 * arg Generic pointer, casted from channel * upon call.
1388 */
1389static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1390{
1391 struct channel *ch = arg;
1392 struct net_device *dev = ch->netdev;
1393 struct ctcm_priv *priv = dev->ml_priv;
1394 struct mpc_group *grp = priv->mpcg;
1395 struct sk_buff *skb = ch->trans_skb;
1396 struct sk_buff *new_skb;
1397 unsigned long saveflags = 0; /* avoids compiler warning */
1398 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1399
1400 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1401 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1402 ch->id, ch->max_bufsize, len);
1403 fsm_deltimer(&ch->timer);
1404
1405 if (skb == NULL) {
1406 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1407 "%s(%s): TRANS_SKB = NULL",
1408 CTCM_FUNTAIL, dev->name);
1409 goto again;
1410 }
1411
1412 if (len < TH_HEADER_LENGTH) {
1413 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1414 "%s(%s): packet length %d to short",
1415 CTCM_FUNTAIL, dev->name, len);
1416 priv->stats.rx_dropped++;
1417 priv->stats.rx_length_errors++;
1418 } else {
1419 /* must have valid th header or game over */
1420 __u32 block_len = len;
1421 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1422 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1423
1424 if (new_skb == NULL) {
1425 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1426 "%s(%d): skb allocation failed",
1427 CTCM_FUNTAIL, dev->name);
1428 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1429 goto again;
1430 }
1431 switch (fsm_getstate(grp->fsm)) {
1432 case MPCG_STATE_RESET:
1433 case MPCG_STATE_INOP:
1434 dev_kfree_skb_any(new_skb);
1435 break;
1436 case MPCG_STATE_FLOWC:
1437 case MPCG_STATE_READY:
1438 memcpy(skb_put(new_skb, block_len),
1439 skb->data, block_len);
1440 skb_queue_tail(&ch->io_queue, new_skb);
1441 tasklet_schedule(&ch->ch_tasklet);
1442 break;
1443 default:
1444 memcpy(skb_put(new_skb, len), skb->data, len);
1445 skb_queue_tail(&ch->io_queue, new_skb);
1446 tasklet_hi_schedule(&ch->ch_tasklet);
1447 break;
1448 }
1449 }
1450
1451again:
1452 switch (fsm_getstate(grp->fsm)) {
1453 int rc, dolock;
1454 case MPCG_STATE_FLOWC:
1455 case MPCG_STATE_READY:
1456 if (ctcm_checkalloc_buffer(ch))
1457 break;
1458 ch->trans_skb->data = ch->trans_skb_data;
1459 skb_reset_tail_pointer(ch->trans_skb);
1460 ch->trans_skb->len = 0;
1461 ch->ccw[1].count = ch->max_bufsize;
1462 if (do_debug_ccw)
1463 ctcmpc_dumpit((char *)&ch->ccw[0],
1464 sizeof(struct ccw1) * 3);
1465 dolock = !in_irq();
1466 if (dolock)
1467 spin_lock_irqsave(
1468 get_ccwdev_lock(ch->cdev), saveflags);
1469 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1470 (unsigned long)ch, 0xff, 0);
1471 if (dolock) /* see remark about conditional locking */
1472 spin_unlock_irqrestore(
1473 get_ccwdev_lock(ch->cdev), saveflags);
1474 if (rc != 0)
1475 ctcm_ccw_check_rc(ch, rc, "normal RX");
1476 default:
1477 break;
1478 }
1479
1480 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1481 __func__, dev->name, ch, ch->id);
1482
1483}
1484
1485/**
1486 * Initialize connection by sending a __u16 of value 0.
1487 *
1488 * fi An instance of a channel statemachine.
1489 * event The event, just happened.
1490 * arg Generic pointer, casted from channel * upon call.
1491 */
1492static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1493{
1494 struct channel *ch = arg;
1495 struct net_device *dev = ch->netdev;
1496 struct ctcm_priv *priv = dev->ml_priv;
1497 struct mpc_group *gptr = priv->mpcg;
1498
1499 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1500 __func__, ch->id, ch);
1501
1502 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1503 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1504 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1505 fsm_getstate(gptr->fsm), ch->protocol);
1506
1507 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1508 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1509
1510 fsm_deltimer(&ch->timer);
1511 if (ctcm_checkalloc_buffer(ch))
1512 goto done;
1513
1514 switch (fsm_getstate(fi)) {
1515 case CTC_STATE_STARTRETRY:
1516 case CTC_STATE_SETUPWAIT:
1517 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1518 ctcmpc_chx_rxidle(fi, event, arg);
1519 } else {
1520 fsm_newstate(fi, CTC_STATE_TXIDLE);
1521 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1522 }
1523 goto done;
1524 default:
1525 break;
1526 }
1527
1528 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1529 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1530
1531done:
1532 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1533 __func__, ch->id, ch);
1534 return;
1535}
1536
1537/**
1538 * Got initial data, check it. If OK,
1539 * notify device statemachine that we are up and
1540 * running.
1541 *
1542 * fi An instance of a channel statemachine.
1543 * event The event, just happened.
1544 * arg Generic pointer, casted from channel * upon call.
1545 */
1546void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1547{
1548 struct channel *ch = arg;
1549 struct net_device *dev = ch->netdev;
1550 struct ctcm_priv *priv = dev->ml_priv;
1551 struct mpc_group *grp = priv->mpcg;
1552 int rc;
1553 unsigned long saveflags = 0; /* avoids compiler warning */
1554
1555 fsm_deltimer(&ch->timer);
1556 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1557 __func__, ch->id, dev->name, smp_processor_id(),
1558 fsm_getstate(fi), fsm_getstate(grp->fsm));
1559
1560 fsm_newstate(fi, CTC_STATE_RXIDLE);
1561 /* XID processing complete */
1562
1563 switch (fsm_getstate(grp->fsm)) {
1564 case MPCG_STATE_FLOWC:
1565 case MPCG_STATE_READY:
1566 if (ctcm_checkalloc_buffer(ch))
1567 goto done;
1568 ch->trans_skb->data = ch->trans_skb_data;
1569 skb_reset_tail_pointer(ch->trans_skb);
1570 ch->trans_skb->len = 0;
1571 ch->ccw[1].count = ch->max_bufsize;
1572 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1573 if (event == CTC_EVENT_START)
1574 /* see remark about conditional locking */
1575 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1576 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1577 (unsigned long)ch, 0xff, 0);
1578 if (event == CTC_EVENT_START)
1579 spin_unlock_irqrestore(
1580 get_ccwdev_lock(ch->cdev), saveflags);
1581 if (rc != 0) {
1582 fsm_newstate(fi, CTC_STATE_RXINIT);
1583 ctcm_ccw_check_rc(ch, rc, "initial RX");
1584 goto done;
1585 }
1586 break;
1587 default:
1588 break;
1589 }
1590
1591 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1592done:
1593 return;
1594}
1595
1596/*
1597 * ctcmpc channel FSM action
1598 * called from several points in ctcmpc_ch_fsm
1599 * ctcmpc only
1600 */
1601static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1602{
1603 struct channel *ch = arg;
1604 struct net_device *dev = ch->netdev;
1605 struct ctcm_priv *priv = dev->ml_priv;
1606 struct mpc_group *grp = priv->mpcg;
1607
1608 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1609 __func__, dev->name, ch->id, ch, smp_processor_id(),
1610 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1611
1612 switch (fsm_getstate(grp->fsm)) {
1613 case MPCG_STATE_XID2INITW:
1614 /* ok..start yside xid exchanges */
1615 if (!ch->in_mpcgroup)
1616 break;
1617 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1618 fsm_deltimer(&grp->timer);
1619 fsm_addtimer(&grp->timer,
1620 MPC_XID_TIMEOUT_VALUE,
1621 MPCG_EVENT_TIMER, dev);
1622 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1623
1624 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1625 /* attn rcvd before xid0 processed via bh */
1626 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1627 break;
1628 case MPCG_STATE_XID2INITX:
1629 case MPCG_STATE_XID0IOWAIT:
1630 case MPCG_STATE_XID0IOWAIX:
1631 /* attn rcvd before xid0 processed on ch
1632 but mid-xid0 processing for group */
1633 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1634 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1635 break;
1636 case MPCG_STATE_XID7INITW:
1637 case MPCG_STATE_XID7INITX:
1638 case MPCG_STATE_XID7INITI:
1639 case MPCG_STATE_XID7INITZ:
1640 switch (fsm_getstate(ch->fsm)) {
1641 case CH_XID7_PENDING:
1642 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1643 break;
1644 case CH_XID7_PENDING2:
1645 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1646 break;
1647 }
1648 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1649 break;
1650 }
1651
1652 return;
1653}
1654
1655/*
1656 * ctcmpc channel FSM action
1657 * called from one point in ctcmpc_ch_fsm
1658 * ctcmpc only
1659 */
1660static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1661{
1662 struct channel *ch = arg;
1663 struct net_device *dev = ch->netdev;
1664 struct ctcm_priv *priv = dev->ml_priv;
1665 struct mpc_group *grp = priv->mpcg;
1666
1667 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1668 __func__, dev->name, ch->id,
1669 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1670
1671 fsm_deltimer(&ch->timer);
1672
1673 switch (fsm_getstate(grp->fsm)) {
1674 case MPCG_STATE_XID0IOWAIT:
1675 /* vtam wants to be primary.start yside xid exchanges*/
1676 /* only receive one attn-busy at a time so must not */
1677 /* change state each time */
1678 grp->changed_side = 1;
1679 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1680 break;
1681 case MPCG_STATE_XID2INITW:
1682 if (grp->changed_side == 1) {
1683 grp->changed_side = 2;
1684 break;
1685 }
1686 /* process began via call to establish_conn */
1687 /* so must report failure instead of reverting */
1688 /* back to ready-for-xid passive state */
1689 if (grp->estconnfunc)
1690 goto done;
1691 /* this attnbusy is NOT the result of xside xid */
1692 /* collisions so yside must have been triggered */
1693 /* by an ATTN that was not intended to start XID */
1694 /* processing. Revert back to ready-for-xid and */
1695 /* wait for ATTN interrupt to signal xid start */
1696 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1697 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1698 fsm_deltimer(&grp->timer);
1699 goto done;
1700 }
1701 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1702 goto done;
1703 case MPCG_STATE_XID2INITX:
1704 /* XID2 was received before ATTN Busy for second
1705 channel.Send yside xid for second channel.
1706 */
1707 if (grp->changed_side == 1) {
1708 grp->changed_side = 2;
1709 break;
1710 }
1711 case MPCG_STATE_XID0IOWAIX:
1712 case MPCG_STATE_XID7INITW:
1713 case MPCG_STATE_XID7INITX:
1714 case MPCG_STATE_XID7INITI:
1715 case MPCG_STATE_XID7INITZ:
1716 default:
1717 /* multiple attn-busy indicates too out-of-sync */
1718 /* and they are certainly not being received as part */
1719 /* of valid mpc group negotiations.. */
1720 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1721 goto done;
1722 }
1723
1724 if (grp->changed_side == 1) {
1725 fsm_deltimer(&grp->timer);
1726 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1727 MPCG_EVENT_TIMER, dev);
1728 }
1729 if (ch->in_mpcgroup)
1730 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1731 else
1732 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1733 "%s(%s): channel %s not added to group",
1734 CTCM_FUNTAIL, dev->name, ch->id);
1735
1736done:
1737 return;
1738}
1739
1740/*
1741 * ctcmpc channel FSM action
1742 * called from several points in ctcmpc_ch_fsm
1743 * ctcmpc only
1744 */
1745static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1746{
1747 struct channel *ch = arg;
1748 struct net_device *dev = ch->netdev;
1749 struct ctcm_priv *priv = dev->ml_priv;
1750 struct mpc_group *grp = priv->mpcg;
1751
1752 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1753 return;
1754}
1755
1756/*
1757 * ctcmpc channel FSM action
1758 * called from several points in ctcmpc_ch_fsm
1759 * ctcmpc only
1760 */
1761static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1762{
1763 struct channel *ach = arg;
1764 struct net_device *dev = ach->netdev;
1765 struct ctcm_priv *priv = dev->ml_priv;
1766 struct mpc_group *grp = priv->mpcg;
1767 struct channel *wch = priv->channel[CTCM_WRITE];
1768 struct channel *rch = priv->channel[CTCM_READ];
1769 struct sk_buff *skb;
1770 struct th_sweep *header;
1771 int rc = 0;
1772 unsigned long saveflags = 0;
1773
1774 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1775 __func__, smp_processor_id(), ach, ach->id);
1776
1777 if (grp->in_sweep == 0)
1778 goto done;
1779
1780 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1781 __func__, wch->th_seq_num);
1782 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1783 __func__, rch->th_seq_num);
1784
1785 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1786 /* give the previous IO time to complete */
1787 fsm_addtimer(&wch->sweep_timer,
1788 200, CTC_EVENT_RSWEEP_TIMER, wch);
1789 goto done;
1790 }
1791
1792 skb = skb_dequeue(&wch->sweep_queue);
1793 if (!skb)
1794 goto done;
1795
1796 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1797 grp->in_sweep = 0;
1798 ctcm_clear_busy_do(dev);
1799 dev_kfree_skb_any(skb);
1800 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1801 goto done;
1802 } else {
1803 atomic_inc(&skb->users);
1804 skb_queue_tail(&wch->io_queue, skb);
1805 }
1806
1807 /* send out the sweep */
1808 wch->ccw[4].count = skb->len;
1809
1810 header = (struct th_sweep *)skb->data;
1811 switch (header->th.th_ch_flag) {
1812 case TH_SWEEP_REQ:
1813 grp->sweep_req_pend_num--;
1814 break;
1815 case TH_SWEEP_RESP:
1816 grp->sweep_rsp_pend_num--;
1817 break;
1818 }
1819
1820 header->sw.th_last_seq = wch->th_seq_num;
1821
1822 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1823 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1824 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1825
1826 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1827 fsm_newstate(wch->fsm, CTC_STATE_TX);
1828
1829 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1830 wch->prof.send_stamp = current_kernel_time(); /* xtime */
1831 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1832 (unsigned long) wch, 0xff, 0);
1833 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1834
1835 if ((grp->sweep_req_pend_num == 0) &&
1836 (grp->sweep_rsp_pend_num == 0)) {
1837 grp->in_sweep = 0;
1838 rch->th_seq_num = 0x00;
1839 wch->th_seq_num = 0x00;
1840 ctcm_clear_busy_do(dev);
1841 }
1842
1843 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1844 __func__, wch->th_seq_num, rch->th_seq_num);
1845
1846 if (rc != 0)
1847 ctcm_ccw_check_rc(wch, rc, "send sweep");
1848
1849done:
1850 return;
1851}
1852
1853
1854/*
1855 * The ctcmpc statemachine for a channel.
1856 */
1857
1858const fsm_node ctcmpc_ch_fsm[] = {
1859 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1860 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1861 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1862 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1863 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1864
1865 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1866 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1867 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1868 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1869 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1870 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1871 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1872 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1873
1874 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1875 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1876 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1877 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1878 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1879 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1880
1881 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1882 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1883 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1884 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1885 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1886
1887 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1888 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1889 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1890 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1891 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1892 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1893 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1894 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1895
1896 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1897 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1898 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1899 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1900 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1901 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1902 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1903 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1904 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1905 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1906
1907 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1908 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1909 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1910 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1911 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1912 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1913 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1914 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1915 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1916 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1917
1918 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1919 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1920 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1921 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1922 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1923 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1924 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1925 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1926 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1927 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1928 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1929
1930 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1931 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1932 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1933 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1934 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1935 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1936 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1937 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1938 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1939 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1940 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1941 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1942 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1943
1944 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1945 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1946 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1947 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1948 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1949 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1950 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1951 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1952 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1953 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1954 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1955 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1956
1957 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1958 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1959 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1960 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1961 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1962 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1963 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1964 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1965 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1966 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1967 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1968 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1969
1970 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1971 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1972 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1973 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1974 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1975 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1976 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1977 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1978 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1979 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1980 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1981 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1982
1983 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1984 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1985 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1986 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1987 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1988 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1989 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1990 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1991 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1992 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1993 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1994 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1995
1996 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1997 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1998 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1999 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
2000 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2001 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2002 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2003 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2004
2005 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
2006 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
2007 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
2008 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2009 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2010 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2011 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2012 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2013 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2014
2015 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2016 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2017 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2018 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2019 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2020 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2021 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2022 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2023
2024 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2025 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2026 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2027 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2028 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2029 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2030 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2031 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2032
2033 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2034 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2035 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2036 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2037 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2038 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2039 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2040
2041 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2042 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2043 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2044 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2045 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2046 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2047 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2048 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2049 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2050 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2051
2052 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2053 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2054 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2055 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2056 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2057};
2058
2059int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2060
2061/*
2062 * Actions for interface - statemachine.
2063 */
2064
2065/**
2066 * Startup channels by sending CTC_EVENT_START to each channel.
2067 *
2068 * fi An instance of an interface statemachine.
2069 * event The event, just happened.
2070 * arg Generic pointer, casted from struct net_device * upon call.
2071 */
2072static void dev_action_start(fsm_instance *fi, int event, void *arg)
2073{
2074 struct net_device *dev = arg;
2075 struct ctcm_priv *priv = dev->ml_priv;
2076 int direction;
2077
2078 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2079
2080 fsm_deltimer(&priv->restart_timer);
2081 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2082 if (IS_MPC(priv))
2083 priv->mpcg->channels_terminating = 0;
2084 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2085 struct channel *ch = priv->channel[direction];
2086 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2087 }
2088}
2089
2090/**
2091 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2092 *
2093 * fi An instance of an interface statemachine.
2094 * event The event, just happened.
2095 * arg Generic pointer, casted from struct net_device * upon call.
2096 */
2097static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2098{
2099 int direction;
2100 struct net_device *dev = arg;
2101 struct ctcm_priv *priv = dev->ml_priv;
2102
2103 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2104
2105 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2106 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2107 struct channel *ch = priv->channel[direction];
2108 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2109 ch->th_seq_num = 0x00;
2110 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2111 __func__, ch->th_seq_num);
2112 }
2113 if (IS_MPC(priv))
2114 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2115}
2116
2117static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2118{
2119 int restart_timer;
2120 struct net_device *dev = arg;
2121 struct ctcm_priv *priv = dev->ml_priv;
2122
2123 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2124
2125 if (IS_MPC(priv)) {
2126 restart_timer = CTCM_TIME_1_SEC;
2127 } else {
2128 restart_timer = CTCM_TIME_5_SEC;
2129 }
2130 dev_info(&dev->dev, "Restarting device\n");
2131
2132 dev_action_stop(fi, event, arg);
2133 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2134 if (IS_MPC(priv))
2135 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2136
2137 /* going back into start sequence too quickly can */
2138 /* result in the other side becoming unreachable due */
2139 /* to sense reported when IO is aborted */
2140 fsm_addtimer(&priv->restart_timer, restart_timer,
2141 DEV_EVENT_START, dev);
2142}
2143
2144/**
2145 * Called from channel statemachine
2146 * when a channel is up and running.
2147 *
2148 * fi An instance of an interface statemachine.
2149 * event The event, just happened.
2150 * arg Generic pointer, casted from struct net_device * upon call.
2151 */
2152static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2153{
2154 struct net_device *dev = arg;
2155 struct ctcm_priv *priv = dev->ml_priv;
2156 int dev_stat = fsm_getstate(fi);
2157
2158 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2159 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2160 dev->name, dev->ml_priv, dev_stat, event);
2161
2162 switch (fsm_getstate(fi)) {
2163 case DEV_STATE_STARTWAIT_RXTX:
2164 if (event == DEV_EVENT_RXUP)
2165 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2166 else
2167 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2168 break;
2169 case DEV_STATE_STARTWAIT_RX:
2170 if (event == DEV_EVENT_RXUP) {
2171 fsm_newstate(fi, DEV_STATE_RUNNING);
2172 dev_info(&dev->dev,
2173 "Connected with remote side\n");
2174 ctcm_clear_busy(dev);
2175 }
2176 break;
2177 case DEV_STATE_STARTWAIT_TX:
2178 if (event == DEV_EVENT_TXUP) {
2179 fsm_newstate(fi, DEV_STATE_RUNNING);
2180 dev_info(&dev->dev,
2181 "Connected with remote side\n");
2182 ctcm_clear_busy(dev);
2183 }
2184 break;
2185 case DEV_STATE_STOPWAIT_TX:
2186 if (event == DEV_EVENT_RXUP)
2187 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188 break;
2189 case DEV_STATE_STOPWAIT_RX:
2190 if (event == DEV_EVENT_TXUP)
2191 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2192 break;
2193 }
2194
2195 if (IS_MPC(priv)) {
2196 if (event == DEV_EVENT_RXUP)
2197 mpc_channel_action(priv->channel[CTCM_READ],
2198 CTCM_READ, MPC_CHANNEL_ADD);
2199 else
2200 mpc_channel_action(priv->channel[CTCM_WRITE],
2201 CTCM_WRITE, MPC_CHANNEL_ADD);
2202 }
2203}
2204
2205/**
2206 * Called from device statemachine
2207 * when a channel has been shutdown.
2208 *
2209 * fi An instance of an interface statemachine.
2210 * event The event, just happened.
2211 * arg Generic pointer, casted from struct net_device * upon call.
2212 */
2213static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2214{
2215
2216 struct net_device *dev = arg;
2217 struct ctcm_priv *priv = dev->ml_priv;
2218
2219 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2220
2221 switch (fsm_getstate(fi)) {
2222 case DEV_STATE_RUNNING:
2223 if (event == DEV_EVENT_TXDOWN)
2224 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2225 else
2226 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2227 break;
2228 case DEV_STATE_STARTWAIT_RX:
2229 if (event == DEV_EVENT_TXDOWN)
2230 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231 break;
2232 case DEV_STATE_STARTWAIT_TX:
2233 if (event == DEV_EVENT_RXDOWN)
2234 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2235 break;
2236 case DEV_STATE_STOPWAIT_RXTX:
2237 if (event == DEV_EVENT_TXDOWN)
2238 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2239 else
2240 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2241 break;
2242 case DEV_STATE_STOPWAIT_RX:
2243 if (event == DEV_EVENT_RXDOWN)
2244 fsm_newstate(fi, DEV_STATE_STOPPED);
2245 break;
2246 case DEV_STATE_STOPWAIT_TX:
2247 if (event == DEV_EVENT_TXDOWN)
2248 fsm_newstate(fi, DEV_STATE_STOPPED);
2249 break;
2250 }
2251 if (IS_MPC(priv)) {
2252 if (event == DEV_EVENT_RXDOWN)
2253 mpc_channel_action(priv->channel[CTCM_READ],
2254 CTCM_READ, MPC_CHANNEL_REMOVE);
2255 else
2256 mpc_channel_action(priv->channel[CTCM_WRITE],
2257 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2258 }
2259}
2260
2261const fsm_node dev_fsm[] = {
2262 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2263 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2264 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2265 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2266 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2267 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2268 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2269 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2270 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2271 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2272 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2273 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2274 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2275 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2276 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2277 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2278 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2279 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2280 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2281 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2282 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2283 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2284 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2285 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2286 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2287 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2288 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2289 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2290 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2291 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2292 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2293 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2294 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2295 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2296 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2297 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2298 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2299};
2300
2301int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2302
2303/* --- This is the END my friend --- */
2304
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2001, 2007
4 * Authors: Fritz Elfert (felfert@millenux.com)
5 * Peter Tiedemann (ptiedem@de.ibm.com)
6 * MPC additions :
7 * Belinda Thompson (belindat@us.ibm.com)
8 * Andy Richter (richtera@us.ibm.com)
9 */
10
11#undef DEBUG
12#undef DEBUGDATA
13#undef DEBUGCCW
14
15#define KMSG_COMPONENT "ctcm"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/interrupt.h>
25#include <linux/timer.h>
26#include <linux/bitops.h>
27
28#include <linux/signal.h>
29#include <linux/string.h>
30
31#include <linux/ip.h>
32#include <linux/if_arp.h>
33#include <linux/tcp.h>
34#include <linux/skbuff.h>
35#include <linux/ctype.h>
36#include <net/dst.h>
37
38#include <linux/io.h>
39#include <asm/ccwdev.h>
40#include <asm/ccwgroup.h>
41#include <linux/uaccess.h>
42
43#include <asm/idals.h>
44
45#include "fsm.h"
46
47#include "ctcm_dbug.h"
48#include "ctcm_main.h"
49#include "ctcm_fsms.h"
50
51const char *dev_state_names[] = {
52 [DEV_STATE_STOPPED] = "Stopped",
53 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
54 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
55 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
56 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
57 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
58 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
59 [DEV_STATE_RUNNING] = "Running",
60};
61
62const char *dev_event_names[] = {
63 [DEV_EVENT_START] = "Start",
64 [DEV_EVENT_STOP] = "Stop",
65 [DEV_EVENT_RXUP] = "RX up",
66 [DEV_EVENT_TXUP] = "TX up",
67 [DEV_EVENT_RXDOWN] = "RX down",
68 [DEV_EVENT_TXDOWN] = "TX down",
69 [DEV_EVENT_RESTART] = "Restart",
70};
71
72const char *ctc_ch_event_names[] = {
73 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
74 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
75 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
76 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
77 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
78 [CTC_EVENT_ATTN] = "Status ATTN",
79 [CTC_EVENT_BUSY] = "Status BUSY",
80 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
81 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
82 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
83 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
84 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
85 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
86 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
87 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
88 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
89 [CTC_EVENT_MC_FAIL] = "Machine check failure",
90 [CTC_EVENT_MC_GOOD] = "Machine check operational",
91 [CTC_EVENT_IRQ] = "IRQ normal",
92 [CTC_EVENT_FINSTAT] = "IRQ final",
93 [CTC_EVENT_TIMER] = "Timer",
94 [CTC_EVENT_START] = "Start",
95 [CTC_EVENT_STOP] = "Stop",
96 /*
97 * additional MPC events
98 */
99 [CTC_EVENT_SEND_XID] = "XID Exchange",
100 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
101};
102
103const char *ctc_ch_state_names[] = {
104 [CTC_STATE_IDLE] = "Idle",
105 [CTC_STATE_STOPPED] = "Stopped",
106 [CTC_STATE_STARTWAIT] = "StartWait",
107 [CTC_STATE_STARTRETRY] = "StartRetry",
108 [CTC_STATE_SETUPWAIT] = "SetupWait",
109 [CTC_STATE_RXINIT] = "RX init",
110 [CTC_STATE_TXINIT] = "TX init",
111 [CTC_STATE_RX] = "RX",
112 [CTC_STATE_TX] = "TX",
113 [CTC_STATE_RXIDLE] = "RX idle",
114 [CTC_STATE_TXIDLE] = "TX idle",
115 [CTC_STATE_RXERR] = "RX error",
116 [CTC_STATE_TXERR] = "TX error",
117 [CTC_STATE_TERM] = "Terminating",
118 [CTC_STATE_DTERM] = "Restarting",
119 [CTC_STATE_NOTOP] = "Not operational",
120 /*
121 * additional MPC states
122 */
123 [CH_XID0_PENDING] = "Pending XID0 Start",
124 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
125 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
126 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
127 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
128 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
129 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
130};
131
132static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133
134/*
135 * ----- static ctcm actions for channel statemachine -----
136 *
137*/
138static void chx_txdone(fsm_instance *fi, int event, void *arg);
139static void chx_rx(fsm_instance *fi, int event, void *arg);
140static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141static void chx_firstio(fsm_instance *fi, int event, void *arg);
142static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156
157/*
158 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159 *
160*/
161static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164/* shared :
165static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179*/
180static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
184
185/*
186 * Check return code of a preceding ccw_device call, halt_IO etc...
187 *
188 * ch : The channel, the error belongs to.
189 * Returns the error code (!= 0) to inspect.
190 */
191void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
192{
193 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
194 "%s(%s): %s: %04x\n",
195 CTCM_FUNTAIL, ch->id, msg, rc);
196 switch (rc) {
197 case -EBUSY:
198 pr_info("%s: The communication peer is busy\n",
199 ch->id);
200 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
201 break;
202 case -ENODEV:
203 pr_err("%s: The specified target device is not valid\n",
204 ch->id);
205 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
206 break;
207 default:
208 pr_err("An I/O operation resulted in error %04x\n",
209 rc);
210 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
211 }
212}
213
214void ctcm_purge_skb_queue(struct sk_buff_head *q)
215{
216 struct sk_buff *skb;
217
218 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
219
220 while ((skb = skb_dequeue(q))) {
221 refcount_dec(&skb->users);
222 dev_kfree_skb_any(skb);
223 }
224}
225
226/*
227 * NOP action for statemachines
228 */
229static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
230{
231}
232
233/*
234 * Actions for channel - statemachines.
235 */
236
237/*
238 * Normal data has been send. Free the corresponding
239 * skb (it's in io_queue), reset dev->tbusy and
240 * revert to idle state.
241 *
242 * fi An instance of a channel statemachine.
243 * event The event, just happened.
244 * arg Generic pointer, casted from channel * upon call.
245 */
246static void chx_txdone(fsm_instance *fi, int event, void *arg)
247{
248 struct channel *ch = arg;
249 struct net_device *dev = ch->netdev;
250 struct ctcm_priv *priv = dev->ml_priv;
251 struct sk_buff *skb;
252 int first = 1;
253 int i;
254 unsigned long duration;
255 unsigned long done_stamp = jiffies;
256
257 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
258
259 duration = done_stamp - ch->prof.send_stamp;
260 if (duration > ch->prof.tx_time)
261 ch->prof.tx_time = duration;
262
263 if (ch->irb->scsw.cmd.count != 0)
264 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
265 "%s(%s): TX not complete, remaining %d bytes",
266 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
267 fsm_deltimer(&ch->timer);
268 while ((skb = skb_dequeue(&ch->io_queue))) {
269 priv->stats.tx_packets++;
270 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
271 if (first) {
272 priv->stats.tx_bytes += 2;
273 first = 0;
274 }
275 refcount_dec(&skb->users);
276 dev_kfree_skb_irq(skb);
277 }
278 spin_lock(&ch->collect_lock);
279 clear_normalized_cda(&ch->ccw[4]);
280 if (ch->collect_len > 0) {
281 int rc;
282
283 if (ctcm_checkalloc_buffer(ch)) {
284 spin_unlock(&ch->collect_lock);
285 return;
286 }
287 ch->trans_skb->data = ch->trans_skb_data;
288 skb_reset_tail_pointer(ch->trans_skb);
289 ch->trans_skb->len = 0;
290 if (ch->prof.maxmulti < (ch->collect_len + 2))
291 ch->prof.maxmulti = ch->collect_len + 2;
292 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
293 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
294 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
295 i = 0;
296 while ((skb = skb_dequeue(&ch->collect_queue))) {
297 skb_copy_from_linear_data(skb,
298 skb_put(ch->trans_skb, skb->len), skb->len);
299 priv->stats.tx_packets++;
300 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
301 refcount_dec(&skb->users);
302 dev_kfree_skb_irq(skb);
303 i++;
304 }
305 ch->collect_len = 0;
306 spin_unlock(&ch->collect_lock);
307 ch->ccw[1].count = ch->trans_skb->len;
308 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
309 ch->prof.send_stamp = jiffies;
310 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
311 ch->prof.doios_multi++;
312 if (rc != 0) {
313 priv->stats.tx_dropped += i;
314 priv->stats.tx_errors += i;
315 fsm_deltimer(&ch->timer);
316 ctcm_ccw_check_rc(ch, rc, "chained TX");
317 }
318 } else {
319 spin_unlock(&ch->collect_lock);
320 fsm_newstate(fi, CTC_STATE_TXIDLE);
321 }
322 ctcm_clear_busy_do(dev);
323}
324
325/*
326 * Initial data is sent.
327 * Notify device statemachine that we are up and
328 * running.
329 *
330 * fi An instance of a channel statemachine.
331 * event The event, just happened.
332 * arg Generic pointer, casted from channel * upon call.
333 */
334void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
335{
336 struct channel *ch = arg;
337 struct net_device *dev = ch->netdev;
338 struct ctcm_priv *priv = dev->ml_priv;
339
340 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
341
342 fsm_deltimer(&ch->timer);
343 fsm_newstate(fi, CTC_STATE_TXIDLE);
344 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
345}
346
347/*
348 * Got normal data, check for sanity, queue it up, allocate new buffer
349 * trigger bottom half, and initiate next read.
350 *
351 * fi An instance of a channel statemachine.
352 * event The event, just happened.
353 * arg Generic pointer, casted from channel * upon call.
354 */
355static void chx_rx(fsm_instance *fi, int event, void *arg)
356{
357 struct channel *ch = arg;
358 struct net_device *dev = ch->netdev;
359 struct ctcm_priv *priv = dev->ml_priv;
360 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
361 struct sk_buff *skb = ch->trans_skb;
362 __u16 block_len = *((__u16 *)skb->data);
363 int check_len;
364 int rc;
365
366 fsm_deltimer(&ch->timer);
367 if (len < 8) {
368 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
369 "%s(%s): got packet with length %d < 8\n",
370 CTCM_FUNTAIL, dev->name, len);
371 priv->stats.rx_dropped++;
372 priv->stats.rx_length_errors++;
373 goto again;
374 }
375 if (len > ch->max_bufsize) {
376 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
377 "%s(%s): got packet with length %d > %d\n",
378 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
379 priv->stats.rx_dropped++;
380 priv->stats.rx_length_errors++;
381 goto again;
382 }
383
384 /*
385 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
386 */
387 switch (ch->protocol) {
388 case CTCM_PROTO_S390:
389 case CTCM_PROTO_OS390:
390 check_len = block_len + 2;
391 break;
392 default:
393 check_len = block_len;
394 break;
395 }
396 if ((len < block_len) || (len > check_len)) {
397 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
398 "%s(%s): got block length %d != rx length %d\n",
399 CTCM_FUNTAIL, dev->name, block_len, len);
400 if (do_debug)
401 ctcmpc_dump_skb(skb, 0);
402
403 *((__u16 *)skb->data) = len;
404 priv->stats.rx_dropped++;
405 priv->stats.rx_length_errors++;
406 goto again;
407 }
408 if (block_len > 2) {
409 *((__u16 *)skb->data) = block_len - 2;
410 ctcm_unpack_skb(ch, skb);
411 }
412 again:
413 skb->data = ch->trans_skb_data;
414 skb_reset_tail_pointer(skb);
415 skb->len = 0;
416 if (ctcm_checkalloc_buffer(ch))
417 return;
418 ch->ccw[1].count = ch->max_bufsize;
419 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
420 if (rc != 0)
421 ctcm_ccw_check_rc(ch, rc, "normal RX");
422}
423
424/*
425 * Initialize connection by sending a __u16 of value 0.
426 *
427 * fi An instance of a channel statemachine.
428 * event The event, just happened.
429 * arg Generic pointer, casted from channel * upon call.
430 */
431static void chx_firstio(fsm_instance *fi, int event, void *arg)
432{
433 int rc;
434 struct channel *ch = arg;
435 int fsmstate = fsm_getstate(fi);
436
437 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
438 "%s(%s) : %02x",
439 CTCM_FUNTAIL, ch->id, fsmstate);
440
441 ch->sense_rc = 0; /* reset unit check report control */
442 if (fsmstate == CTC_STATE_TXIDLE)
443 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
444 "%s(%s): remote side issued READ?, init.\n",
445 CTCM_FUNTAIL, ch->id);
446 fsm_deltimer(&ch->timer);
447 if (ctcm_checkalloc_buffer(ch))
448 return;
449 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
450 (ch->protocol == CTCM_PROTO_OS390)) {
451 /* OS/390 resp. z/OS */
452 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
453 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
454 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
455 CTC_EVENT_TIMER, ch);
456 chx_rxidle(fi, event, arg);
457 } else {
458 struct net_device *dev = ch->netdev;
459 struct ctcm_priv *priv = dev->ml_priv;
460 fsm_newstate(fi, CTC_STATE_TXIDLE);
461 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
462 }
463 return;
464 }
465 /*
466 * Don't setup a timer for receiving the initial RX frame
467 * if in compatibility mode, since VM TCP delays the initial
468 * frame until it has some data to send.
469 */
470 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
471 (ch->protocol != CTCM_PROTO_S390))
472 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
473
474 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
475 ch->ccw[1].count = 2; /* Transfer only length */
476
477 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
478 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
479 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
480 if (rc != 0) {
481 fsm_deltimer(&ch->timer);
482 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
483 ctcm_ccw_check_rc(ch, rc, "init IO");
484 }
485 /*
486 * If in compatibility mode since we don't setup a timer, we
487 * also signal RX channel up immediately. This enables us
488 * to send packets early which in turn usually triggers some
489 * reply from VM TCP which brings up the RX channel to it's
490 * final state.
491 */
492 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
493 (ch->protocol == CTCM_PROTO_S390)) {
494 struct net_device *dev = ch->netdev;
495 struct ctcm_priv *priv = dev->ml_priv;
496 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
497 }
498}
499
500/*
501 * Got initial data, check it. If OK,
502 * notify device statemachine that we are up and
503 * running.
504 *
505 * fi An instance of a channel statemachine.
506 * event The event, just happened.
507 * arg Generic pointer, casted from channel * upon call.
508 */
509static void chx_rxidle(fsm_instance *fi, int event, void *arg)
510{
511 struct channel *ch = arg;
512 struct net_device *dev = ch->netdev;
513 struct ctcm_priv *priv = dev->ml_priv;
514 __u16 buflen;
515 int rc;
516
517 fsm_deltimer(&ch->timer);
518 buflen = *((__u16 *)ch->trans_skb->data);
519 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
520 __func__, dev->name, buflen);
521
522 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
523 if (ctcm_checkalloc_buffer(ch))
524 return;
525 ch->ccw[1].count = ch->max_bufsize;
526 fsm_newstate(fi, CTC_STATE_RXIDLE);
527 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
528 if (rc != 0) {
529 fsm_newstate(fi, CTC_STATE_RXINIT);
530 ctcm_ccw_check_rc(ch, rc, "initial RX");
531 } else
532 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
533 } else {
534 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
535 __func__, dev->name,
536 buflen, CTCM_INITIAL_BLOCKLEN);
537 chx_firstio(fi, event, arg);
538 }
539}
540
541/*
542 * Set channel into extended mode.
543 *
544 * fi An instance of a channel statemachine.
545 * event The event, just happened.
546 * arg Generic pointer, casted from channel * upon call.
547 */
548static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
549{
550 struct channel *ch = arg;
551 int rc;
552 unsigned long saveflags = 0;
553 int timeout = CTCM_TIME_5_SEC;
554
555 fsm_deltimer(&ch->timer);
556 if (IS_MPC(ch)) {
557 timeout = 1500;
558 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
559 __func__, smp_processor_id(), ch, ch->id);
560 }
561 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
562 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
563 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
564
565 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
566 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
567 /* Such conditional locking is undeterministic in
568 * static view. => ignore sparse warnings here. */
569
570 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0);
571 if (event == CTC_EVENT_TIMER) /* see above comments */
572 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
573 if (rc != 0) {
574 fsm_deltimer(&ch->timer);
575 fsm_newstate(fi, CTC_STATE_STARTWAIT);
576 ctcm_ccw_check_rc(ch, rc, "set Mode");
577 } else
578 ch->retry = 0;
579}
580
581/*
582 * Setup channel.
583 *
584 * fi An instance of a channel statemachine.
585 * event The event, just happened.
586 * arg Generic pointer, casted from channel * upon call.
587 */
588static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
589{
590 struct channel *ch = arg;
591 unsigned long saveflags;
592 int rc;
593
594 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
595 CTCM_FUNTAIL, ch->id,
596 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
597
598 if (ch->trans_skb != NULL) {
599 clear_normalized_cda(&ch->ccw[1]);
600 dev_kfree_skb(ch->trans_skb);
601 ch->trans_skb = NULL;
602 }
603 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
604 ch->ccw[1].cmd_code = CCW_CMD_READ;
605 ch->ccw[1].flags = CCW_FLAG_SLI;
606 ch->ccw[1].count = 0;
607 } else {
608 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
609 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
610 ch->ccw[1].count = 0;
611 }
612 if (ctcm_checkalloc_buffer(ch)) {
613 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
614 "%s(%s): %s trans_skb alloc delayed "
615 "until first transfer",
616 CTCM_FUNTAIL, ch->id,
617 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
618 "RX" : "TX");
619 }
620 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
621 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
622 ch->ccw[0].count = 0;
623 ch->ccw[0].cda = 0;
624 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
625 ch->ccw[2].flags = CCW_FLAG_SLI;
626 ch->ccw[2].count = 0;
627 ch->ccw[2].cda = 0;
628 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
629 ch->ccw[4].cda = 0;
630 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
631
632 fsm_newstate(fi, CTC_STATE_STARTWAIT);
633 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
634 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
635 rc = ccw_device_halt(ch->cdev, 0);
636 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
637 if (rc != 0) {
638 if (rc != -EBUSY)
639 fsm_deltimer(&ch->timer);
640 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
641 }
642}
643
644/*
645 * Shutdown a channel.
646 *
647 * fi An instance of a channel statemachine.
648 * event The event, just happened.
649 * arg Generic pointer, casted from channel * upon call.
650 */
651static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
652{
653 struct channel *ch = arg;
654 unsigned long saveflags = 0;
655 int rc;
656 int oldstate;
657
658 fsm_deltimer(&ch->timer);
659 if (IS_MPC(ch))
660 fsm_deltimer(&ch->sweep_timer);
661
662 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
663
664 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
665 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
666 /* Such conditional locking is undeterministic in
667 * static view. => ignore sparse warnings here. */
668 oldstate = fsm_getstate(fi);
669 fsm_newstate(fi, CTC_STATE_TERM);
670 rc = ccw_device_halt(ch->cdev, 0);
671
672 if (event == CTC_EVENT_STOP)
673 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
674 /* see remark above about conditional locking */
675
676 if (rc != 0 && rc != -EBUSY) {
677 fsm_deltimer(&ch->timer);
678 if (event != CTC_EVENT_STOP) {
679 fsm_newstate(fi, oldstate);
680 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
681 }
682 }
683}
684
685/*
686 * Cleanup helper for chx_fail and chx_stopped
687 * cleanup channels queue and notify interface statemachine.
688 *
689 * fi An instance of a channel statemachine.
690 * state The next state (depending on caller).
691 * ch The channel to operate on.
692 */
693static void ctcm_chx_cleanup(fsm_instance *fi, int state,
694 struct channel *ch)
695{
696 struct net_device *dev = ch->netdev;
697 struct ctcm_priv *priv = dev->ml_priv;
698
699 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
700 "%s(%s): %s[%d]\n",
701 CTCM_FUNTAIL, dev->name, ch->id, state);
702
703 fsm_deltimer(&ch->timer);
704 if (IS_MPC(ch))
705 fsm_deltimer(&ch->sweep_timer);
706
707 fsm_newstate(fi, state);
708 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
709 clear_normalized_cda(&ch->ccw[1]);
710 dev_kfree_skb_any(ch->trans_skb);
711 ch->trans_skb = NULL;
712 }
713
714 ch->th_seg = 0x00;
715 ch->th_seq_num = 0x00;
716 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
717 skb_queue_purge(&ch->io_queue);
718 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
719 } else {
720 ctcm_purge_skb_queue(&ch->io_queue);
721 if (IS_MPC(ch))
722 ctcm_purge_skb_queue(&ch->sweep_queue);
723 spin_lock(&ch->collect_lock);
724 ctcm_purge_skb_queue(&ch->collect_queue);
725 ch->collect_len = 0;
726 spin_unlock(&ch->collect_lock);
727 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
728 }
729}
730
731/*
732 * A channel has successfully been halted.
733 * Cleanup it's queue and notify interface statemachine.
734 *
735 * fi An instance of a channel statemachine.
736 * event The event, just happened.
737 * arg Generic pointer, casted from channel * upon call.
738 */
739static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
740{
741 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
742}
743
744/*
745 * A stop command from device statemachine arrived and we are in
746 * not operational mode. Set state to stopped.
747 *
748 * fi An instance of a channel statemachine.
749 * event The event, just happened.
750 * arg Generic pointer, casted from channel * upon call.
751 */
752static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
753{
754 fsm_newstate(fi, CTC_STATE_STOPPED);
755}
756
757/*
758 * A machine check for no path, not operational status or gone device has
759 * happened.
760 * Cleanup queue and notify interface statemachine.
761 *
762 * fi An instance of a channel statemachine.
763 * event The event, just happened.
764 * arg Generic pointer, casted from channel * upon call.
765 */
766static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
767{
768 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
769}
770
771/*
772 * Handle error during setup of channel.
773 *
774 * fi An instance of a channel statemachine.
775 * event The event, just happened.
776 * arg Generic pointer, casted from channel * upon call.
777 */
778static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
779{
780 struct channel *ch = arg;
781 struct net_device *dev = ch->netdev;
782 struct ctcm_priv *priv = dev->ml_priv;
783
784 /*
785 * Special case: Got UC_RCRESET on setmode.
786 * This means that remote side isn't setup. In this case
787 * simply retry after some 10 secs...
788 */
789 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
790 ((event == CTC_EVENT_UC_RCRESET) ||
791 (event == CTC_EVENT_UC_RSRESET))) {
792 fsm_newstate(fi, CTC_STATE_STARTRETRY);
793 fsm_deltimer(&ch->timer);
794 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
795 if (!IS_MPC(ch) &&
796 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
797 int rc = ccw_device_halt(ch->cdev, 0);
798 if (rc != 0)
799 ctcm_ccw_check_rc(ch, rc,
800 "HaltIO in chx_setuperr");
801 }
802 return;
803 }
804
805 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
806 "%s(%s) : %s error during %s channel setup state=%s\n",
807 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
808 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
809 fsm_getstate_str(fi));
810
811 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
812 fsm_newstate(fi, CTC_STATE_RXERR);
813 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
814 } else {
815 fsm_newstate(fi, CTC_STATE_TXERR);
816 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
817 }
818}
819
820/*
821 * Restart a channel after an error.
822 *
823 * fi An instance of a channel statemachine.
824 * event The event, just happened.
825 * arg Generic pointer, casted from channel * upon call.
826 */
827static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
828{
829 struct channel *ch = arg;
830 struct net_device *dev = ch->netdev;
831 unsigned long saveflags = 0;
832 int oldstate;
833 int rc;
834
835 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
836 "%s: %s[%d] of %s\n",
837 CTCM_FUNTAIL, ch->id, event, dev->name);
838
839 fsm_deltimer(&ch->timer);
840
841 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
842 oldstate = fsm_getstate(fi);
843 fsm_newstate(fi, CTC_STATE_STARTWAIT);
844 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
845 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
846 /* Such conditional locking is a known problem for
847 * sparse because its undeterministic in static view.
848 * Warnings should be ignored here. */
849 rc = ccw_device_halt(ch->cdev, 0);
850 if (event == CTC_EVENT_TIMER)
851 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
852 if (rc != 0) {
853 if (rc != -EBUSY) {
854 fsm_deltimer(&ch->timer);
855 fsm_newstate(fi, oldstate);
856 }
857 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
858 }
859}
860
861/*
862 * Handle error during RX initial handshake (exchange of
863 * 0-length block header)
864 *
865 * fi An instance of a channel statemachine.
866 * event The event, just happened.
867 * arg Generic pointer, casted from channel * upon call.
868 */
869static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
870{
871 struct channel *ch = arg;
872 struct net_device *dev = ch->netdev;
873 struct ctcm_priv *priv = dev->ml_priv;
874
875 if (event == CTC_EVENT_TIMER) {
876 if (!IS_MPCDEV(dev))
877 /* TODO : check if MPC deletes timer somewhere */
878 fsm_deltimer(&ch->timer);
879 if (ch->retry++ < 3)
880 ctcm_chx_restart(fi, event, arg);
881 else {
882 fsm_newstate(fi, CTC_STATE_RXERR);
883 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
884 }
885 } else {
886 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
887 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
888 ctc_ch_event_names[event], fsm_getstate_str(fi));
889
890 dev_warn(&dev->dev,
891 "Initialization failed with RX/TX init handshake "
892 "error %s\n", ctc_ch_event_names[event]);
893 }
894}
895
896/*
897 * Notify device statemachine if we gave up initialization
898 * of RX channel.
899 *
900 * fi An instance of a channel statemachine.
901 * event The event, just happened.
902 * arg Generic pointer, casted from channel * upon call.
903 */
904static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
905{
906 struct channel *ch = arg;
907 struct net_device *dev = ch->netdev;
908 struct ctcm_priv *priv = dev->ml_priv;
909
910 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
911 "%s(%s): RX %s busy, init. fail",
912 CTCM_FUNTAIL, dev->name, ch->id);
913 fsm_newstate(fi, CTC_STATE_RXERR);
914 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
915}
916
917/*
918 * Handle RX Unit check remote reset (remote disconnected)
919 *
920 * fi An instance of a channel statemachine.
921 * event The event, just happened.
922 * arg Generic pointer, casted from channel * upon call.
923 */
924static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
925{
926 struct channel *ch = arg;
927 struct channel *ch2;
928 struct net_device *dev = ch->netdev;
929 struct ctcm_priv *priv = dev->ml_priv;
930
931 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
932 "%s: %s: remote disconnect - re-init ...",
933 CTCM_FUNTAIL, dev->name);
934 fsm_deltimer(&ch->timer);
935 /*
936 * Notify device statemachine
937 */
938 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
939 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
940
941 fsm_newstate(fi, CTC_STATE_DTERM);
942 ch2 = priv->channel[CTCM_WRITE];
943 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
944
945 ccw_device_halt(ch->cdev, 0);
946 ccw_device_halt(ch2->cdev, 0);
947}
948
949/*
950 * Handle error during TX channel initialization.
951 *
952 * fi An instance of a channel statemachine.
953 * event The event, just happened.
954 * arg Generic pointer, casted from channel * upon call.
955 */
956static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
957{
958 struct channel *ch = arg;
959 struct net_device *dev = ch->netdev;
960 struct ctcm_priv *priv = dev->ml_priv;
961
962 if (event == CTC_EVENT_TIMER) {
963 fsm_deltimer(&ch->timer);
964 if (ch->retry++ < 3)
965 ctcm_chx_restart(fi, event, arg);
966 else {
967 fsm_newstate(fi, CTC_STATE_TXERR);
968 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
969 }
970 } else {
971 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
972 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
973 ctc_ch_event_names[event], fsm_getstate_str(fi));
974
975 dev_warn(&dev->dev,
976 "Initialization failed with RX/TX init handshake "
977 "error %s\n", ctc_ch_event_names[event]);
978 }
979}
980
981/*
982 * Handle TX timeout by retrying operation.
983 *
984 * fi An instance of a channel statemachine.
985 * event The event, just happened.
986 * arg Generic pointer, casted from channel * upon call.
987 */
988static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
989{
990 struct channel *ch = arg;
991 struct net_device *dev = ch->netdev;
992 struct ctcm_priv *priv = dev->ml_priv;
993 struct sk_buff *skb;
994
995 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
996 __func__, smp_processor_id(), ch, ch->id);
997
998 fsm_deltimer(&ch->timer);
999 if (ch->retry++ > 3) {
1000 struct mpc_group *gptr = priv->mpcg;
1001 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1002 "%s: %s: retries exceeded",
1003 CTCM_FUNTAIL, ch->id);
1004 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1005 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1006 use gptr as mpc indicator */
1007 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1008 ctcm_chx_restart(fi, event, arg);
1009 goto done;
1010 }
1011
1012 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1013 "%s : %s: retry %d",
1014 CTCM_FUNTAIL, ch->id, ch->retry);
1015 skb = skb_peek(&ch->io_queue);
1016 if (skb) {
1017 int rc = 0;
1018 unsigned long saveflags = 0;
1019 clear_normalized_cda(&ch->ccw[4]);
1020 ch->ccw[4].count = skb->len;
1021 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1022 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1023 "%s: %s: IDAL alloc failed",
1024 CTCM_FUNTAIL, ch->id);
1025 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1026 ctcm_chx_restart(fi, event, arg);
1027 goto done;
1028 }
1029 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1030 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1031 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1032 /* Such conditional locking is a known problem for
1033 * sparse because its undeterministic in static view.
1034 * Warnings should be ignored here. */
1035 if (do_debug_ccw)
1036 ctcmpc_dumpit((char *)&ch->ccw[3],
1037 sizeof(struct ccw1) * 3);
1038
1039 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 0xff, 0);
1040 if (event == CTC_EVENT_TIMER)
1041 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1042 saveflags);
1043 if (rc != 0) {
1044 fsm_deltimer(&ch->timer);
1045 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1046 ctcm_purge_skb_queue(&ch->io_queue);
1047 }
1048 }
1049done:
1050 return;
1051}
1052
1053/*
1054 * Handle fatal errors during an I/O command.
1055 *
1056 * fi An instance of a channel statemachine.
1057 * event The event, just happened.
1058 * arg Generic pointer, casted from channel * upon call.
1059 */
1060static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1061{
1062 struct channel *ch = arg;
1063 struct net_device *dev = ch->netdev;
1064 struct ctcm_priv *priv = dev->ml_priv;
1065 int rd = CHANNEL_DIRECTION(ch->flags);
1066
1067 fsm_deltimer(&ch->timer);
1068 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1069 "%s: %s: %s unrecoverable channel error",
1070 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1071
1072 if (IS_MPC(ch)) {
1073 priv->stats.tx_dropped++;
1074 priv->stats.tx_errors++;
1075 }
1076 if (rd == CTCM_READ) {
1077 fsm_newstate(fi, CTC_STATE_RXERR);
1078 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1079 } else {
1080 fsm_newstate(fi, CTC_STATE_TXERR);
1081 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1082 }
1083}
1084
1085/*
1086 * The ctcm statemachine for a channel.
1087 */
1088const fsm_node ch_fsm[] = {
1089 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1090 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1091 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1092 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1093
1094 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1095 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1096 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1097 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1098 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1099
1100 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1101 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1102 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1103 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1104 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1105 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1106
1107 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1108 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1109 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1110 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1111
1112 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1113 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1114 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1115 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1116 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1117 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1120
1121 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1122 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1123 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1124 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1125 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1126 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1127 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1128 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1129 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1130 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1131
1132 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1133 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1134 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1135 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1136 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1137 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1138 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1139
1140 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1141 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1142 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1143 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1144 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1145 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1146 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1147 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1148
1149 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1150 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1151 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1152 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1153 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1154 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1155 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1156
1157 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1158 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1159 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1160 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1161 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1162 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1163
1164 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1165 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1166 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1167 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1168 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1169 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1170
1171 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1172 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1173 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1174 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1175 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1176 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1177 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1178 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1179
1180 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1181 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1182 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1183 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1184};
1185
1186int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1187
1188/*
1189 * MPC actions for mpc channel statemachine
1190 * handling of MPC protocol requires extra
1191 * statemachine and actions which are prefixed ctcmpc_ .
1192 * The ctc_ch_states and ctc_ch_state_names,
1193 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1194 * which are expanded by some elements.
1195 */
1196
1197/*
1198 * Actions for mpc channel statemachine.
1199 */
1200
1201/*
1202 * Normal data has been send. Free the corresponding
1203 * skb (it's in io_queue), reset dev->tbusy and
1204 * revert to idle state.
1205 *
1206 * fi An instance of a channel statemachine.
1207 * event The event, just happened.
1208 * arg Generic pointer, casted from channel * upon call.
1209 */
1210static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1211{
1212 struct channel *ch = arg;
1213 struct net_device *dev = ch->netdev;
1214 struct ctcm_priv *priv = dev->ml_priv;
1215 struct mpc_group *grp = priv->mpcg;
1216 struct sk_buff *skb;
1217 int first = 1;
1218 int i;
1219 __u32 data_space;
1220 unsigned long duration;
1221 struct sk_buff *peekskb;
1222 int rc;
1223 struct th_header *header;
1224 struct pdu *p_header;
1225 unsigned long done_stamp = jiffies;
1226
1227 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1228 __func__, dev->name, smp_processor_id());
1229
1230 duration = done_stamp - ch->prof.send_stamp;
1231 if (duration > ch->prof.tx_time)
1232 ch->prof.tx_time = duration;
1233
1234 if (ch->irb->scsw.cmd.count != 0)
1235 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1236 "%s(%s): TX not complete, remaining %d bytes",
1237 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1238 fsm_deltimer(&ch->timer);
1239 while ((skb = skb_dequeue(&ch->io_queue))) {
1240 priv->stats.tx_packets++;
1241 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1242 if (first) {
1243 priv->stats.tx_bytes += 2;
1244 first = 0;
1245 }
1246 refcount_dec(&skb->users);
1247 dev_kfree_skb_irq(skb);
1248 }
1249 spin_lock(&ch->collect_lock);
1250 clear_normalized_cda(&ch->ccw[4]);
1251 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1252 spin_unlock(&ch->collect_lock);
1253 fsm_newstate(fi, CTC_STATE_TXIDLE);
1254 goto done;
1255 }
1256
1257 if (ctcm_checkalloc_buffer(ch)) {
1258 spin_unlock(&ch->collect_lock);
1259 goto done;
1260 }
1261 ch->trans_skb->data = ch->trans_skb_data;
1262 skb_reset_tail_pointer(ch->trans_skb);
1263 ch->trans_skb->len = 0;
1264 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1265 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1266 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1267 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1268 i = 0;
1269 p_header = NULL;
1270 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1271
1272 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1273 " data_space:%04x\n",
1274 __func__, data_space);
1275
1276 while ((skb = skb_dequeue(&ch->collect_queue))) {
1277 skb_put_data(ch->trans_skb, skb->data, skb->len);
1278 p_header = (struct pdu *)
1279 (skb_tail_pointer(ch->trans_skb) - skb->len);
1280 p_header->pdu_flag = 0x00;
1281 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
1282 p_header->pdu_flag |= 0x60;
1283 else
1284 p_header->pdu_flag |= 0x20;
1285
1286 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1287 __func__, ch->trans_skb->len);
1288 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1289 " to 32 bytes sent to vtam\n", __func__);
1290 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1291
1292 ch->collect_len -= skb->len;
1293 data_space -= skb->len;
1294 priv->stats.tx_packets++;
1295 priv->stats.tx_bytes += skb->len;
1296 refcount_dec(&skb->users);
1297 dev_kfree_skb_any(skb);
1298 peekskb = skb_peek(&ch->collect_queue);
1299 if (peekskb->len > data_space)
1300 break;
1301 i++;
1302 }
1303 /* p_header points to the last one we handled */
1304 if (p_header)
1305 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1306
1307 header = skb_push(ch->trans_skb, TH_HEADER_LENGTH);
1308 memset(header, 0, TH_HEADER_LENGTH);
1309
1310 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1311 ch->th_seq_num++;
1312 header->th_seq_num = ch->th_seq_num;
1313
1314 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1315 __func__, ch->th_seq_num);
1316
1317 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1318 __func__, ch->trans_skb->len);
1319 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1320 "data to vtam from collect_q\n", __func__);
1321 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1322 min_t(int, ch->trans_skb->len, 50));
1323
1324 spin_unlock(&ch->collect_lock);
1325 clear_normalized_cda(&ch->ccw[1]);
1326
1327 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1328 (void *)(unsigned long)ch->ccw[1].cda,
1329 ch->trans_skb->data);
1330 ch->ccw[1].count = ch->max_bufsize;
1331
1332 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1333 dev_kfree_skb_any(ch->trans_skb);
1334 ch->trans_skb = NULL;
1335 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1336 "%s: %s: IDAL alloc failed",
1337 CTCM_FUNTAIL, ch->id);
1338 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1339 return;
1340 }
1341
1342 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1343 (void *)(unsigned long)ch->ccw[1].cda,
1344 ch->trans_skb->data);
1345
1346 ch->ccw[1].count = ch->trans_skb->len;
1347 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1348 ch->prof.send_stamp = jiffies;
1349 if (do_debug_ccw)
1350 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1351 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1352 ch->prof.doios_multi++;
1353 if (rc != 0) {
1354 priv->stats.tx_dropped += i;
1355 priv->stats.tx_errors += i;
1356 fsm_deltimer(&ch->timer);
1357 ctcm_ccw_check_rc(ch, rc, "chained TX");
1358 }
1359done:
1360 ctcm_clear_busy(dev);
1361 return;
1362}
1363
1364/*
1365 * Got normal data, check for sanity, queue it up, allocate new buffer
1366 * trigger bottom half, and initiate next read.
1367 *
1368 * fi An instance of a channel statemachine.
1369 * event The event, just happened.
1370 * arg Generic pointer, casted from channel * upon call.
1371 */
1372static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1373{
1374 struct channel *ch = arg;
1375 struct net_device *dev = ch->netdev;
1376 struct ctcm_priv *priv = dev->ml_priv;
1377 struct mpc_group *grp = priv->mpcg;
1378 struct sk_buff *skb = ch->trans_skb;
1379 struct sk_buff *new_skb;
1380 unsigned long saveflags = 0; /* avoids compiler warning */
1381 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1382
1383 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1384 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1385 ch->id, ch->max_bufsize, len);
1386 fsm_deltimer(&ch->timer);
1387
1388 if (skb == NULL) {
1389 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1390 "%s(%s): TRANS_SKB = NULL",
1391 CTCM_FUNTAIL, dev->name);
1392 goto again;
1393 }
1394
1395 if (len < TH_HEADER_LENGTH) {
1396 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1397 "%s(%s): packet length %d too short",
1398 CTCM_FUNTAIL, dev->name, len);
1399 priv->stats.rx_dropped++;
1400 priv->stats.rx_length_errors++;
1401 } else {
1402 /* must have valid th header or game over */
1403 __u32 block_len = len;
1404 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1405 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1406
1407 if (new_skb == NULL) {
1408 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1409 "%s(%s): skb allocation failed",
1410 CTCM_FUNTAIL, dev->name);
1411 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1412 goto again;
1413 }
1414 switch (fsm_getstate(grp->fsm)) {
1415 case MPCG_STATE_RESET:
1416 case MPCG_STATE_INOP:
1417 dev_kfree_skb_any(new_skb);
1418 break;
1419 case MPCG_STATE_FLOWC:
1420 case MPCG_STATE_READY:
1421 skb_put_data(new_skb, skb->data, block_len);
1422 skb_queue_tail(&ch->io_queue, new_skb);
1423 tasklet_schedule(&ch->ch_tasklet);
1424 break;
1425 default:
1426 skb_put_data(new_skb, skb->data, len);
1427 skb_queue_tail(&ch->io_queue, new_skb);
1428 tasklet_hi_schedule(&ch->ch_tasklet);
1429 break;
1430 }
1431 }
1432
1433again:
1434 switch (fsm_getstate(grp->fsm)) {
1435 int rc, dolock;
1436 case MPCG_STATE_FLOWC:
1437 case MPCG_STATE_READY:
1438 if (ctcm_checkalloc_buffer(ch))
1439 break;
1440 ch->trans_skb->data = ch->trans_skb_data;
1441 skb_reset_tail_pointer(ch->trans_skb);
1442 ch->trans_skb->len = 0;
1443 ch->ccw[1].count = ch->max_bufsize;
1444 if (do_debug_ccw)
1445 ctcmpc_dumpit((char *)&ch->ccw[0],
1446 sizeof(struct ccw1) * 3);
1447 dolock = !in_hardirq();
1448 if (dolock)
1449 spin_lock_irqsave(
1450 get_ccwdev_lock(ch->cdev), saveflags);
1451 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1452 if (dolock) /* see remark about conditional locking */
1453 spin_unlock_irqrestore(
1454 get_ccwdev_lock(ch->cdev), saveflags);
1455 if (rc != 0)
1456 ctcm_ccw_check_rc(ch, rc, "normal RX");
1457 break;
1458 default:
1459 break;
1460 }
1461
1462 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1463 __func__, dev->name, ch, ch->id);
1464
1465}
1466
1467/*
1468 * Initialize connection by sending a __u16 of value 0.
1469 *
1470 * fi An instance of a channel statemachine.
1471 * event The event, just happened.
1472 * arg Generic pointer, casted from channel * upon call.
1473 */
1474static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1475{
1476 struct channel *ch = arg;
1477 struct net_device *dev = ch->netdev;
1478 struct ctcm_priv *priv = dev->ml_priv;
1479 struct mpc_group *gptr = priv->mpcg;
1480
1481 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1482 __func__, ch->id, ch);
1483
1484 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1485 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1486 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1487 fsm_getstate(gptr->fsm), ch->protocol);
1488
1489 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1490 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1491
1492 fsm_deltimer(&ch->timer);
1493 if (ctcm_checkalloc_buffer(ch))
1494 goto done;
1495
1496 switch (fsm_getstate(fi)) {
1497 case CTC_STATE_STARTRETRY:
1498 case CTC_STATE_SETUPWAIT:
1499 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1500 ctcmpc_chx_rxidle(fi, event, arg);
1501 } else {
1502 fsm_newstate(fi, CTC_STATE_TXIDLE);
1503 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1504 }
1505 goto done;
1506 default:
1507 break;
1508 }
1509
1510 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1511 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1512
1513done:
1514 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1515 __func__, ch->id, ch);
1516 return;
1517}
1518
1519/*
1520 * Got initial data, check it. If OK,
1521 * notify device statemachine that we are up and
1522 * running.
1523 *
1524 * fi An instance of a channel statemachine.
1525 * event The event, just happened.
1526 * arg Generic pointer, casted from channel * upon call.
1527 */
1528void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1529{
1530 struct channel *ch = arg;
1531 struct net_device *dev = ch->netdev;
1532 struct ctcm_priv *priv = dev->ml_priv;
1533 struct mpc_group *grp = priv->mpcg;
1534 int rc;
1535 unsigned long saveflags = 0; /* avoids compiler warning */
1536
1537 fsm_deltimer(&ch->timer);
1538 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1539 __func__, ch->id, dev->name, smp_processor_id(),
1540 fsm_getstate(fi), fsm_getstate(grp->fsm));
1541
1542 fsm_newstate(fi, CTC_STATE_RXIDLE);
1543 /* XID processing complete */
1544
1545 switch (fsm_getstate(grp->fsm)) {
1546 case MPCG_STATE_FLOWC:
1547 case MPCG_STATE_READY:
1548 if (ctcm_checkalloc_buffer(ch))
1549 goto done;
1550 ch->trans_skb->data = ch->trans_skb_data;
1551 skb_reset_tail_pointer(ch->trans_skb);
1552 ch->trans_skb->len = 0;
1553 ch->ccw[1].count = ch->max_bufsize;
1554 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1555 if (event == CTC_EVENT_START)
1556 /* see remark about conditional locking */
1557 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1558 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
1559 if (event == CTC_EVENT_START)
1560 spin_unlock_irqrestore(
1561 get_ccwdev_lock(ch->cdev), saveflags);
1562 if (rc != 0) {
1563 fsm_newstate(fi, CTC_STATE_RXINIT);
1564 ctcm_ccw_check_rc(ch, rc, "initial RX");
1565 goto done;
1566 }
1567 break;
1568 default:
1569 break;
1570 }
1571
1572 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1573done:
1574 return;
1575}
1576
1577/*
1578 * ctcmpc channel FSM action
1579 * called from several points in ctcmpc_ch_fsm
1580 * ctcmpc only
1581 */
1582static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1583{
1584 struct channel *ch = arg;
1585 struct net_device *dev = ch->netdev;
1586 struct ctcm_priv *priv = dev->ml_priv;
1587 struct mpc_group *grp = priv->mpcg;
1588
1589 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1590 __func__, dev->name, ch->id, ch, smp_processor_id(),
1591 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1592
1593 switch (fsm_getstate(grp->fsm)) {
1594 case MPCG_STATE_XID2INITW:
1595 /* ok..start yside xid exchanges */
1596 if (!ch->in_mpcgroup)
1597 break;
1598 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1599 fsm_deltimer(&grp->timer);
1600 fsm_addtimer(&grp->timer,
1601 MPC_XID_TIMEOUT_VALUE,
1602 MPCG_EVENT_TIMER, dev);
1603 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1604
1605 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1606 /* attn rcvd before xid0 processed via bh */
1607 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1608 break;
1609 case MPCG_STATE_XID2INITX:
1610 case MPCG_STATE_XID0IOWAIT:
1611 case MPCG_STATE_XID0IOWAIX:
1612 /* attn rcvd before xid0 processed on ch
1613 but mid-xid0 processing for group */
1614 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1615 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1616 break;
1617 case MPCG_STATE_XID7INITW:
1618 case MPCG_STATE_XID7INITX:
1619 case MPCG_STATE_XID7INITI:
1620 case MPCG_STATE_XID7INITZ:
1621 switch (fsm_getstate(ch->fsm)) {
1622 case CH_XID7_PENDING:
1623 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1624 break;
1625 case CH_XID7_PENDING2:
1626 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1627 break;
1628 }
1629 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1630 break;
1631 }
1632
1633 return;
1634}
1635
1636/*
1637 * ctcmpc channel FSM action
1638 * called from one point in ctcmpc_ch_fsm
1639 * ctcmpc only
1640 */
1641static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1642{
1643 struct channel *ch = arg;
1644 struct net_device *dev = ch->netdev;
1645 struct ctcm_priv *priv = dev->ml_priv;
1646 struct mpc_group *grp = priv->mpcg;
1647
1648 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1649 __func__, dev->name, ch->id,
1650 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1651
1652 fsm_deltimer(&ch->timer);
1653
1654 switch (fsm_getstate(grp->fsm)) {
1655 case MPCG_STATE_XID0IOWAIT:
1656 /* vtam wants to be primary.start yside xid exchanges*/
1657 /* only receive one attn-busy at a time so must not */
1658 /* change state each time */
1659 grp->changed_side = 1;
1660 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1661 break;
1662 case MPCG_STATE_XID2INITW:
1663 if (grp->changed_side == 1) {
1664 grp->changed_side = 2;
1665 break;
1666 }
1667 /* process began via call to establish_conn */
1668 /* so must report failure instead of reverting */
1669 /* back to ready-for-xid passive state */
1670 if (grp->estconnfunc)
1671 goto done;
1672 /* this attnbusy is NOT the result of xside xid */
1673 /* collisions so yside must have been triggered */
1674 /* by an ATTN that was not intended to start XID */
1675 /* processing. Revert back to ready-for-xid and */
1676 /* wait for ATTN interrupt to signal xid start */
1677 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1678 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1679 fsm_deltimer(&grp->timer);
1680 goto done;
1681 }
1682 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1683 goto done;
1684 case MPCG_STATE_XID2INITX:
1685 /* XID2 was received before ATTN Busy for second
1686 channel.Send yside xid for second channel.
1687 */
1688 if (grp->changed_side == 1) {
1689 grp->changed_side = 2;
1690 break;
1691 }
1692 fallthrough;
1693 case MPCG_STATE_XID0IOWAIX:
1694 case MPCG_STATE_XID7INITW:
1695 case MPCG_STATE_XID7INITX:
1696 case MPCG_STATE_XID7INITI:
1697 case MPCG_STATE_XID7INITZ:
1698 default:
1699 /* multiple attn-busy indicates too out-of-sync */
1700 /* and they are certainly not being received as part */
1701 /* of valid mpc group negotiations.. */
1702 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1703 goto done;
1704 }
1705
1706 if (grp->changed_side == 1) {
1707 fsm_deltimer(&grp->timer);
1708 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1709 MPCG_EVENT_TIMER, dev);
1710 }
1711 if (ch->in_mpcgroup)
1712 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1713 else
1714 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1715 "%s(%s): channel %s not added to group",
1716 CTCM_FUNTAIL, dev->name, ch->id);
1717
1718done:
1719 return;
1720}
1721
1722/*
1723 * ctcmpc channel FSM action
1724 * called from several points in ctcmpc_ch_fsm
1725 * ctcmpc only
1726 */
1727static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1728{
1729 struct channel *ch = arg;
1730 struct net_device *dev = ch->netdev;
1731 struct ctcm_priv *priv = dev->ml_priv;
1732 struct mpc_group *grp = priv->mpcg;
1733
1734 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1735 return;
1736}
1737
1738/*
1739 * ctcmpc channel FSM action
1740 * called from several points in ctcmpc_ch_fsm
1741 * ctcmpc only
1742 */
1743static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1744{
1745 struct channel *ach = arg;
1746 struct net_device *dev = ach->netdev;
1747 struct ctcm_priv *priv = dev->ml_priv;
1748 struct mpc_group *grp = priv->mpcg;
1749 struct channel *wch = priv->channel[CTCM_WRITE];
1750 struct channel *rch = priv->channel[CTCM_READ];
1751 struct sk_buff *skb;
1752 struct th_sweep *header;
1753 int rc = 0;
1754 unsigned long saveflags = 0;
1755
1756 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1757 __func__, smp_processor_id(), ach, ach->id);
1758
1759 if (grp->in_sweep == 0)
1760 goto done;
1761
1762 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1763 __func__, wch->th_seq_num);
1764 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1765 __func__, rch->th_seq_num);
1766
1767 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1768 /* give the previous IO time to complete */
1769 fsm_addtimer(&wch->sweep_timer,
1770 200, CTC_EVENT_RSWEEP_TIMER, wch);
1771 goto done;
1772 }
1773
1774 skb = skb_dequeue(&wch->sweep_queue);
1775 if (!skb)
1776 goto done;
1777
1778 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1779 grp->in_sweep = 0;
1780 ctcm_clear_busy_do(dev);
1781 dev_kfree_skb_any(skb);
1782 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1783 goto done;
1784 } else {
1785 refcount_inc(&skb->users);
1786 skb_queue_tail(&wch->io_queue, skb);
1787 }
1788
1789 /* send out the sweep */
1790 wch->ccw[4].count = skb->len;
1791
1792 header = (struct th_sweep *)skb->data;
1793 switch (header->th.th_ch_flag) {
1794 case TH_SWEEP_REQ:
1795 grp->sweep_req_pend_num--;
1796 break;
1797 case TH_SWEEP_RESP:
1798 grp->sweep_rsp_pend_num--;
1799 break;
1800 }
1801
1802 header->sw.th_last_seq = wch->th_seq_num;
1803
1804 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1805 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1806 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1807
1808 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1809 fsm_newstate(wch->fsm, CTC_STATE_TX);
1810
1811 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1812 wch->prof.send_stamp = jiffies;
1813 rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0);
1814 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1815
1816 if ((grp->sweep_req_pend_num == 0) &&
1817 (grp->sweep_rsp_pend_num == 0)) {
1818 grp->in_sweep = 0;
1819 rch->th_seq_num = 0x00;
1820 wch->th_seq_num = 0x00;
1821 ctcm_clear_busy_do(dev);
1822 }
1823
1824 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1825 __func__, wch->th_seq_num, rch->th_seq_num);
1826
1827 if (rc != 0)
1828 ctcm_ccw_check_rc(wch, rc, "send sweep");
1829
1830done:
1831 return;
1832}
1833
1834
1835/*
1836 * The ctcmpc statemachine for a channel.
1837 */
1838
1839const fsm_node ctcmpc_ch_fsm[] = {
1840 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1841 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1842 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1843 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1844 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1845
1846 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1847 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1848 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1849 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1850 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1851 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1852 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1853 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1854
1855 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1856 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1857 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1858 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1859 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1860 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1861
1862 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1863 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1864 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1865 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1866 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1867
1868 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1869 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1870 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1871 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1872 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1873 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1874 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1875 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876
1877 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1878 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1879 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1880 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1881 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1882 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1883 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1884 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1885 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1886 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1887
1888 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1889 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1890 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1891 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1892 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1893 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1894 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1895 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1896 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1897 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1898
1899 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1900 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1901 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1902 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1903 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1904 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1905 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1906 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1907 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1908 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1909 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1910
1911 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1912 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1913 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1914 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1915 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1916 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1917 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1918 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1919 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1920 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1921 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1922 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1923 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1924
1925 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1926 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1927 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1928 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1929 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1930 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1931 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1932 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1933 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1934 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1935 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1936 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1937
1938 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1939 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1940 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1941 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1942 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1943 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1944 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1945 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1946 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1947 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1948 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1949 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1950
1951 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1952 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1953 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1954 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1955 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1956 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1957 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1958 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1959 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1960 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1961 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1962 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1963
1964 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1965 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1966 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1967 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1968 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1969 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1970 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1971 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1972 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1973 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1974 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1975 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1976
1977 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1978 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1979 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1980 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1981 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1982 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1983 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1984 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1985
1986 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1987 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1988 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1989 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1990 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1991 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1992 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1993 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1994 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
1995
1996 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1997 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1998 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1999 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2000 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2001 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2002 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2003 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2004
2005 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2006 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2007 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2008 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2009 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2010 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2011 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2012 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2013
2014 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2015 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2016 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2017 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2018 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2019 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2020 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2021
2022 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2023 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2024 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2025 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2026 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2027 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2028 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2029 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2030 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2031 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2032
2033 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2034 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2035 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2036 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2037 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2038};
2039
2040int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2041
2042/*
2043 * Actions for interface - statemachine.
2044 */
2045
2046/*
2047 * Startup channels by sending CTC_EVENT_START to each channel.
2048 *
2049 * fi An instance of an interface statemachine.
2050 * event The event, just happened.
2051 * arg Generic pointer, casted from struct net_device * upon call.
2052 */
2053static void dev_action_start(fsm_instance *fi, int event, void *arg)
2054{
2055 struct net_device *dev = arg;
2056 struct ctcm_priv *priv = dev->ml_priv;
2057 int direction;
2058
2059 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2060
2061 fsm_deltimer(&priv->restart_timer);
2062 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2063 if (IS_MPC(priv))
2064 priv->mpcg->channels_terminating = 0;
2065 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2066 struct channel *ch = priv->channel[direction];
2067 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2068 }
2069}
2070
2071/*
2072 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2073 *
2074 * fi An instance of an interface statemachine.
2075 * event The event, just happened.
2076 * arg Generic pointer, casted from struct net_device * upon call.
2077 */
2078static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2079{
2080 int direction;
2081 struct net_device *dev = arg;
2082 struct ctcm_priv *priv = dev->ml_priv;
2083
2084 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2085
2086 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2087 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2088 struct channel *ch = priv->channel[direction];
2089 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2090 ch->th_seq_num = 0x00;
2091 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2092 __func__, ch->th_seq_num);
2093 }
2094 if (IS_MPC(priv))
2095 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2096}
2097
2098static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2099{
2100 int restart_timer;
2101 struct net_device *dev = arg;
2102 struct ctcm_priv *priv = dev->ml_priv;
2103
2104 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2105
2106 if (IS_MPC(priv)) {
2107 restart_timer = CTCM_TIME_1_SEC;
2108 } else {
2109 restart_timer = CTCM_TIME_5_SEC;
2110 }
2111 dev_info(&dev->dev, "Restarting device\n");
2112
2113 dev_action_stop(fi, event, arg);
2114 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2115 if (IS_MPC(priv))
2116 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2117
2118 /* going back into start sequence too quickly can */
2119 /* result in the other side becoming unreachable due */
2120 /* to sense reported when IO is aborted */
2121 fsm_addtimer(&priv->restart_timer, restart_timer,
2122 DEV_EVENT_START, dev);
2123}
2124
2125/*
2126 * Called from channel statemachine
2127 * when a channel is up and running.
2128 *
2129 * fi An instance of an interface statemachine.
2130 * event The event, just happened.
2131 * arg Generic pointer, casted from struct net_device * upon call.
2132 */
2133static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2134{
2135 struct net_device *dev = arg;
2136 struct ctcm_priv *priv = dev->ml_priv;
2137 int dev_stat = fsm_getstate(fi);
2138
2139 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2140 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2141 dev->name, dev->ml_priv, dev_stat, event);
2142
2143 switch (fsm_getstate(fi)) {
2144 case DEV_STATE_STARTWAIT_RXTX:
2145 if (event == DEV_EVENT_RXUP)
2146 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2147 else
2148 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2149 break;
2150 case DEV_STATE_STARTWAIT_RX:
2151 if (event == DEV_EVENT_RXUP) {
2152 fsm_newstate(fi, DEV_STATE_RUNNING);
2153 dev_info(&dev->dev,
2154 "Connected with remote side\n");
2155 ctcm_clear_busy(dev);
2156 }
2157 break;
2158 case DEV_STATE_STARTWAIT_TX:
2159 if (event == DEV_EVENT_TXUP) {
2160 fsm_newstate(fi, DEV_STATE_RUNNING);
2161 dev_info(&dev->dev,
2162 "Connected with remote side\n");
2163 ctcm_clear_busy(dev);
2164 }
2165 break;
2166 case DEV_STATE_STOPWAIT_TX:
2167 if (event == DEV_EVENT_RXUP)
2168 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2169 break;
2170 case DEV_STATE_STOPWAIT_RX:
2171 if (event == DEV_EVENT_TXUP)
2172 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2173 break;
2174 }
2175
2176 if (IS_MPC(priv)) {
2177 if (event == DEV_EVENT_RXUP)
2178 mpc_channel_action(priv->channel[CTCM_READ],
2179 CTCM_READ, MPC_CHANNEL_ADD);
2180 else
2181 mpc_channel_action(priv->channel[CTCM_WRITE],
2182 CTCM_WRITE, MPC_CHANNEL_ADD);
2183 }
2184}
2185
2186/*
2187 * Called from device statemachine
2188 * when a channel has been shutdown.
2189 *
2190 * fi An instance of an interface statemachine.
2191 * event The event, just happened.
2192 * arg Generic pointer, casted from struct net_device * upon call.
2193 */
2194static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2195{
2196
2197 struct net_device *dev = arg;
2198 struct ctcm_priv *priv = dev->ml_priv;
2199
2200 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2201
2202 switch (fsm_getstate(fi)) {
2203 case DEV_STATE_RUNNING:
2204 if (event == DEV_EVENT_TXDOWN)
2205 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2206 else
2207 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2208 break;
2209 case DEV_STATE_STARTWAIT_RX:
2210 if (event == DEV_EVENT_TXDOWN)
2211 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2212 break;
2213 case DEV_STATE_STARTWAIT_TX:
2214 if (event == DEV_EVENT_RXDOWN)
2215 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2216 break;
2217 case DEV_STATE_STOPWAIT_RXTX:
2218 if (event == DEV_EVENT_TXDOWN)
2219 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2220 else
2221 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2222 break;
2223 case DEV_STATE_STOPWAIT_RX:
2224 if (event == DEV_EVENT_RXDOWN)
2225 fsm_newstate(fi, DEV_STATE_STOPPED);
2226 break;
2227 case DEV_STATE_STOPWAIT_TX:
2228 if (event == DEV_EVENT_TXDOWN)
2229 fsm_newstate(fi, DEV_STATE_STOPPED);
2230 break;
2231 }
2232 if (IS_MPC(priv)) {
2233 if (event == DEV_EVENT_RXDOWN)
2234 mpc_channel_action(priv->channel[CTCM_READ],
2235 CTCM_READ, MPC_CHANNEL_REMOVE);
2236 else
2237 mpc_channel_action(priv->channel[CTCM_WRITE],
2238 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2239 }
2240}
2241
2242const fsm_node dev_fsm[] = {
2243 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2244 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2245 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2246 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2247 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2248 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2249 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2250 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2251 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2252 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2253 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2254 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2255 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2256 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2257 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2258 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2259 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2260 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2261 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2262 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2263 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2264 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2265 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2266 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2267 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2268 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2269 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2270 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2271 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2272 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2273 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2274 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2275 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2276 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2277 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2278 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2279 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2280};
2281
2282int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2283
2284/* --- This is the END my friend --- */
2285