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-rw-r--r--drivers/s390/net/ctcm_fsms.c2347
1 files changed, 2347 insertions, 0 deletions
diff --git a/drivers/s390/net/ctcm_fsms.c b/drivers/s390/net/ctcm_fsms.c
new file mode 100644
index 000000000000..2a106f3a076d
--- /dev/null
+++ b/drivers/s390/net/ctcm_fsms.c
@@ -0,0 +1,2347 @@
1/*
2 * drivers/s390/net/ctcm_fsms.c
3 *
4 * Copyright IBM Corp. 2001, 2007
5 * Authors: Fritz Elfert (felfert@millenux.com)
6 * Peter Tiedemann (ptiedem@de.ibm.com)
7 * MPC additions :
8 * Belinda Thompson (belindat@us.ibm.com)
9 * Andy Richter (richtera@us.ibm.com)
10 */
11
12#undef DEBUG
13#undef DEBUGDATA
14#undef DEBUGCCW
15
16#include <linux/module.h>
17#include <linux/init.h>
18#include <linux/kernel.h>
19#include <linux/slab.h>
20#include <linux/errno.h>
21#include <linux/types.h>
22#include <linux/interrupt.h>
23#include <linux/timer.h>
24#include <linux/bitops.h>
25
26#include <linux/signal.h>
27#include <linux/string.h>
28
29#include <linux/ip.h>
30#include <linux/if_arp.h>
31#include <linux/tcp.h>
32#include <linux/skbuff.h>
33#include <linux/ctype.h>
34#include <net/dst.h>
35
36#include <linux/io.h>
37#include <asm/ccwdev.h>
38#include <asm/ccwgroup.h>
39#include <linux/uaccess.h>
40
41#include <asm/idals.h>
42
43#include "fsm.h"
44#include "cu3088.h"
45
46#include "ctcm_dbug.h"
47#include "ctcm_main.h"
48#include "ctcm_fsms.h"
49
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 preceeding ccw_device call, halt_IO etc...
186 *
187 * ch : The channel, the error belongs to.
188 * Returns the error code (!= 0) to inspect.
189 */
190void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
191{
192 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
193 "ccw error %s (%s): %04x\n", ch->id, msg, rc);
194 switch (rc) {
195 case -EBUSY:
196 ctcm_pr_warn("%s (%s): Busy !\n", ch->id, msg);
197 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
198 break;
199 case -ENODEV:
200 ctcm_pr_emerg("%s (%s): Invalid device called for IO\n",
201 ch->id, msg);
202 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
203 break;
204 default:
205 ctcm_pr_emerg("%s (%s): Unknown error in do_IO %04x\n",
206 ch->id, msg, rc);
207 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
208 }
209}
210
211void ctcm_purge_skb_queue(struct sk_buff_head *q)
212{
213 struct sk_buff *skb;
214
215 CTCM_DBF_TEXT(TRACE, 3, __FUNCTION__);
216
217 while ((skb = skb_dequeue(q))) {
218 atomic_dec(&skb->users);
219 dev_kfree_skb_any(skb);
220 }
221}
222
223/**
224 * NOP action for statemachines
225 */
226static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
227{
228}
229
230/*
231 * Actions for channel - statemachines.
232 */
233
234/**
235 * Normal data has been send. Free the corresponding
236 * skb (it's in io_queue), reset dev->tbusy and
237 * revert to idle state.
238 *
239 * fi An instance of a channel statemachine.
240 * event The event, just happened.
241 * arg Generic pointer, casted from channel * upon call.
242 */
243static void chx_txdone(fsm_instance *fi, int event, void *arg)
244{
245 struct channel *ch = arg;
246 struct net_device *dev = ch->netdev;
247 struct ctcm_priv *priv = dev->priv;
248 struct sk_buff *skb;
249 int first = 1;
250 int i;
251 unsigned long duration;
252 struct timespec done_stamp = current_kernel_time(); /* xtime */
253
254 duration =
255 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
256 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
257 if (duration > ch->prof.tx_time)
258 ch->prof.tx_time = duration;
259
260 if (ch->irb->scsw.count != 0)
261 ctcm_pr_debug("%s: TX not complete, remaining %d bytes\n",
262 dev->name, ch->irb->scsw.count);
263 fsm_deltimer(&ch->timer);
264 while ((skb = skb_dequeue(&ch->io_queue))) {
265 priv->stats.tx_packets++;
266 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
267 if (first) {
268 priv->stats.tx_bytes += 2;
269 first = 0;
270 }
271 atomic_dec(&skb->users);
272 dev_kfree_skb_irq(skb);
273 }
274 spin_lock(&ch->collect_lock);
275 clear_normalized_cda(&ch->ccw[4]);
276 if (ch->collect_len > 0) {
277 int rc;
278
279 if (ctcm_checkalloc_buffer(ch)) {
280 spin_unlock(&ch->collect_lock);
281 return;
282 }
283 ch->trans_skb->data = ch->trans_skb_data;
284 skb_reset_tail_pointer(ch->trans_skb);
285 ch->trans_skb->len = 0;
286 if (ch->prof.maxmulti < (ch->collect_len + 2))
287 ch->prof.maxmulti = ch->collect_len + 2;
288 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
289 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
290 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
291 i = 0;
292 while ((skb = skb_dequeue(&ch->collect_queue))) {
293 skb_copy_from_linear_data(skb,
294 skb_put(ch->trans_skb, skb->len), skb->len);
295 priv->stats.tx_packets++;
296 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
297 atomic_dec(&skb->users);
298 dev_kfree_skb_irq(skb);
299 i++;
300 }
301 ch->collect_len = 0;
302 spin_unlock(&ch->collect_lock);
303 ch->ccw[1].count = ch->trans_skb->len;
304 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
305 ch->prof.send_stamp = current_kernel_time(); /* xtime */
306 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
307 (unsigned long)ch, 0xff, 0);
308 ch->prof.doios_multi++;
309 if (rc != 0) {
310 priv->stats.tx_dropped += i;
311 priv->stats.tx_errors += i;
312 fsm_deltimer(&ch->timer);
313 ctcm_ccw_check_rc(ch, rc, "chained TX");
314 }
315 } else {
316 spin_unlock(&ch->collect_lock);
317 fsm_newstate(fi, CTC_STATE_TXIDLE);
318 }
319 ctcm_clear_busy_do(dev);
320}
321
322/**
323 * Initial data is sent.
324 * Notify device statemachine that we are up and
325 * running.
326 *
327 * fi An instance of a channel statemachine.
328 * event The event, just happened.
329 * arg Generic pointer, casted from channel * upon call.
330 */
331void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
332{
333 struct channel *ch = arg;
334 struct net_device *dev = ch->netdev;
335 struct ctcm_priv *priv = dev->priv;
336
337 CTCM_DBF_TEXT(TRACE, 6, __FUNCTION__);
338 fsm_deltimer(&ch->timer);
339 fsm_newstate(fi, CTC_STATE_TXIDLE);
340 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
341}
342
343/**
344 * Got normal data, check for sanity, queue it up, allocate new buffer
345 * trigger bottom half, and initiate next read.
346 *
347 * fi An instance of a channel statemachine.
348 * event The event, just happened.
349 * arg Generic pointer, casted from channel * upon call.
350 */
351static void chx_rx(fsm_instance *fi, int event, void *arg)
352{
353 struct channel *ch = arg;
354 struct net_device *dev = ch->netdev;
355 struct ctcm_priv *priv = dev->priv;
356 int len = ch->max_bufsize - ch->irb->scsw.count;
357 struct sk_buff *skb = ch->trans_skb;
358 __u16 block_len = *((__u16 *)skb->data);
359 int check_len;
360 int rc;
361
362 fsm_deltimer(&ch->timer);
363 if (len < 8) {
364 ctcm_pr_debug("%s: got packet with length %d < 8\n",
365 dev->name, len);
366 priv->stats.rx_dropped++;
367 priv->stats.rx_length_errors++;
368 goto again;
369 }
370 if (len > ch->max_bufsize) {
371 ctcm_pr_debug("%s: got packet with length %d > %d\n",
372 dev->name, len, ch->max_bufsize);
373 priv->stats.rx_dropped++;
374 priv->stats.rx_length_errors++;
375 goto again;
376 }
377
378 /*
379 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
380 */
381 switch (ch->protocol) {
382 case CTCM_PROTO_S390:
383 case CTCM_PROTO_OS390:
384 check_len = block_len + 2;
385 break;
386 default:
387 check_len = block_len;
388 break;
389 }
390 if ((len < block_len) || (len > check_len)) {
391 ctcm_pr_debug("%s: got block length %d != rx length %d\n",
392 dev->name, block_len, len);
393 if (do_debug)
394 ctcmpc_dump_skb(skb, 0);
395
396 *((__u16 *)skb->data) = len;
397 priv->stats.rx_dropped++;
398 priv->stats.rx_length_errors++;
399 goto again;
400 }
401 block_len -= 2;
402 if (block_len > 0) {
403 *((__u16 *)skb->data) = block_len;
404 ctcm_unpack_skb(ch, skb);
405 }
406 again:
407 skb->data = ch->trans_skb_data;
408 skb_reset_tail_pointer(skb);
409 skb->len = 0;
410 if (ctcm_checkalloc_buffer(ch))
411 return;
412 ch->ccw[1].count = ch->max_bufsize;
413 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
414 (unsigned long)ch, 0xff, 0);
415 if (rc != 0)
416 ctcm_ccw_check_rc(ch, rc, "normal RX");
417}
418
419/**
420 * Initialize connection by sending a __u16 of value 0.
421 *
422 * fi An instance of a channel statemachine.
423 * event The event, just happened.
424 * arg Generic pointer, casted from channel * upon call.
425 */
426static void chx_firstio(fsm_instance *fi, int event, void *arg)
427{
428 struct channel *ch = arg;
429 int rc;
430
431 CTCM_DBF_TEXT(TRACE, 6, __FUNCTION__);
432
433 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
434 ctcm_pr_debug("%s: remote side issued READ?, init.\n", ch->id);
435 fsm_deltimer(&ch->timer);
436 if (ctcm_checkalloc_buffer(ch))
437 return;
438 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
439 (ch->protocol == CTCM_PROTO_OS390)) {
440 /* OS/390 resp. z/OS */
441 if (CHANNEL_DIRECTION(ch->flags) == READ) {
442 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
443 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
444 CTC_EVENT_TIMER, ch);
445 chx_rxidle(fi, event, arg);
446 } else {
447 struct net_device *dev = ch->netdev;
448 struct ctcm_priv *priv = dev->priv;
449 fsm_newstate(fi, CTC_STATE_TXIDLE);
450 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
451 }
452 return;
453 }
454
455 /*
456 * Don't setup a timer for receiving the initial RX frame
457 * if in compatibility mode, since VM TCP delays the initial
458 * frame until it has some data to send.
459 */
460 if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
461 (ch->protocol != CTCM_PROTO_S390))
462 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
463
464 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
465 ch->ccw[1].count = 2; /* Transfer only length */
466
467 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
468 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
469 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
470 (unsigned long)ch, 0xff, 0);
471 if (rc != 0) {
472 fsm_deltimer(&ch->timer);
473 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
474 ctcm_ccw_check_rc(ch, rc, "init IO");
475 }
476 /*
477 * If in compatibility mode since we don't setup a timer, we
478 * also signal RX channel up immediately. This enables us
479 * to send packets early which in turn usually triggers some
480 * reply from VM TCP which brings up the RX channel to it's
481 * final state.
482 */
483 if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
484 (ch->protocol == CTCM_PROTO_S390)) {
485 struct net_device *dev = ch->netdev;
486 struct ctcm_priv *priv = dev->priv;
487 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
488 }
489}
490
491/**
492 * Got initial data, check it. If OK,
493 * notify device statemachine that we are up and
494 * running.
495 *
496 * fi An instance of a channel statemachine.
497 * event The event, just happened.
498 * arg Generic pointer, casted from channel * upon call.
499 */
500static void chx_rxidle(fsm_instance *fi, int event, void *arg)
501{
502 struct channel *ch = arg;
503 struct net_device *dev = ch->netdev;
504 struct ctcm_priv *priv = dev->priv;
505 __u16 buflen;
506 int rc;
507
508 CTCM_DBF_TEXT(TRACE, 6, __FUNCTION__);
509 fsm_deltimer(&ch->timer);
510 buflen = *((__u16 *)ch->trans_skb->data);
511 if (do_debug)
512 ctcm_pr_debug("%s: Initial RX count %d\n", dev->name, buflen);
513
514 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
515 if (ctcm_checkalloc_buffer(ch))
516 return;
517 ch->ccw[1].count = ch->max_bufsize;
518 fsm_newstate(fi, CTC_STATE_RXIDLE);
519 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
520 (unsigned long)ch, 0xff, 0);
521 if (rc != 0) {
522 fsm_newstate(fi, CTC_STATE_RXINIT);
523 ctcm_ccw_check_rc(ch, rc, "initial RX");
524 } else
525 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
526 } else {
527 if (do_debug)
528 ctcm_pr_debug("%s: Initial RX count %d not %d\n",
529 dev->name, buflen, CTCM_INITIAL_BLOCKLEN);
530 chx_firstio(fi, event, arg);
531 }
532}
533
534/**
535 * Set channel into extended mode.
536 *
537 * fi An instance of a channel statemachine.
538 * event The event, just happened.
539 * arg Generic pointer, casted from channel * upon call.
540 */
541static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
542{
543 struct channel *ch = arg;
544 int rc;
545 unsigned long saveflags = 0;
546 int timeout = CTCM_TIME_5_SEC;
547
548 fsm_deltimer(&ch->timer);
549 if (IS_MPC(ch)) {
550 timeout = 1500;
551 if (do_debug)
552 ctcm_pr_debug("ctcm enter: %s(): cp=%i ch=0x%p id=%s\n",
553 __FUNCTION__, smp_processor_id(), ch, ch->id);
554 }
555 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
556 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
557 if (do_debug_ccw && IS_MPC(ch))
558 ctcmpc_dumpit((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
559
560 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
561 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
562 /* Such conditional locking is undeterministic in
563 * static view. => ignore sparse warnings here. */
564
565 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
566 (unsigned long)ch, 0xff, 0);
567 if (event == CTC_EVENT_TIMER) /* see above comments */
568 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
569 if (rc != 0) {
570 fsm_deltimer(&ch->timer);
571 fsm_newstate(fi, CTC_STATE_STARTWAIT);
572 ctcm_ccw_check_rc(ch, rc, "set Mode");
573 } else
574 ch->retry = 0;
575}
576
577/**
578 * Setup channel.
579 *
580 * fi An instance of a channel statemachine.
581 * event The event, just happened.
582 * arg Generic pointer, casted from channel * upon call.
583 */
584static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
585{
586 struct channel *ch = arg;
587 int rc;
588 struct net_device *dev;
589 unsigned long saveflags;
590
591 CTCM_DBF_TEXT(TRACE, 5, __FUNCTION__);
592 if (ch == NULL) {
593 ctcm_pr_warn("chx_start ch=NULL\n");
594 return;
595 }
596 if (ch->netdev == NULL) {
597 ctcm_pr_warn("chx_start dev=NULL, id=%s\n", ch->id);
598 return;
599 }
600 dev = ch->netdev;
601
602 if (do_debug)
603 ctcm_pr_debug("%s: %s channel start\n", dev->name,
604 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
605
606 if (ch->trans_skb != NULL) {
607 clear_normalized_cda(&ch->ccw[1]);
608 dev_kfree_skb(ch->trans_skb);
609 ch->trans_skb = NULL;
610 }
611 if (CHANNEL_DIRECTION(ch->flags) == READ) {
612 ch->ccw[1].cmd_code = CCW_CMD_READ;
613 ch->ccw[1].flags = CCW_FLAG_SLI;
614 ch->ccw[1].count = 0;
615 } else {
616 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
617 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
618 ch->ccw[1].count = 0;
619 }
620 if (ctcm_checkalloc_buffer(ch)) {
621 ctcm_pr_notice("%s: %s trans_skb allocation delayed "
622 "until first transfer\n", dev->name,
623 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
624 }
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 CTCM_DBF_TEXT(TRACE, 2, __FUNCTION__);
665 fsm_deltimer(&ch->timer);
666 if (IS_MPC(ch))
667 fsm_deltimer(&ch->sweep_timer);
668
669 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
670
671 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
672 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
673 /* Such conditional locking is undeterministic in
674 * static view. => ignore sparse warnings here. */
675 oldstate = fsm_getstate(fi);
676 fsm_newstate(fi, CTC_STATE_TERM);
677 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
678
679 if (event == CTC_EVENT_STOP)
680 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
681 /* see remark above about conditional locking */
682
683 if (rc != 0 && rc != -EBUSY) {
684 fsm_deltimer(&ch->timer);
685 if (event != CTC_EVENT_STOP) {
686 fsm_newstate(fi, oldstate);
687 ctcm_ccw_check_rc(ch, rc, (char *)__FUNCTION__);
688 }
689 }
690}
691
692/**
693 * Cleanup helper for chx_fail and chx_stopped
694 * cleanup channels queue and notify interface statemachine.
695 *
696 * fi An instance of a channel statemachine.
697 * state The next state (depending on caller).
698 * ch The channel to operate on.
699 */
700static void ctcm_chx_cleanup(fsm_instance *fi, int state,
701 struct channel *ch)
702{
703 struct net_device *dev = ch->netdev;
704 struct ctcm_priv *priv = dev->priv;
705
706 CTCM_DBF_TEXT(TRACE, 3, __FUNCTION__);
707
708 fsm_deltimer(&ch->timer);
709 if (IS_MPC(ch))
710 fsm_deltimer(&ch->sweep_timer);
711
712 fsm_newstate(fi, state);
713 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
714 clear_normalized_cda(&ch->ccw[1]);
715 dev_kfree_skb_any(ch->trans_skb);
716 ch->trans_skb = NULL;
717 }
718
719 ch->th_seg = 0x00;
720 ch->th_seq_num = 0x00;
721 if (CHANNEL_DIRECTION(ch->flags) == READ) {
722 skb_queue_purge(&ch->io_queue);
723 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
724 } else {
725 ctcm_purge_skb_queue(&ch->io_queue);
726 if (IS_MPC(ch))
727 ctcm_purge_skb_queue(&ch->sweep_queue);
728 spin_lock(&ch->collect_lock);
729 ctcm_purge_skb_queue(&ch->collect_queue);
730 ch->collect_len = 0;
731 spin_unlock(&ch->collect_lock);
732 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
733 }
734}
735
736/**
737 * A channel has successfully been halted.
738 * Cleanup it's queue and notify interface statemachine.
739 *
740 * fi An instance of a channel statemachine.
741 * event The event, just happened.
742 * arg Generic pointer, casted from channel * upon call.
743 */
744static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
745{
746 CTCM_DBF_TEXT(TRACE, 3, __FUNCTION__);
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_DBF_TEXT(TRACE, 3, __FUNCTION__);
775 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
776}
777
778/**
779 * Handle error during setup of channel.
780 *
781 * fi An instance of a channel statemachine.
782 * event The event, just happened.
783 * arg Generic pointer, casted from channel * upon call.
784 */
785static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
786{
787 struct channel *ch = arg;
788 struct net_device *dev = ch->netdev;
789 struct ctcm_priv *priv = dev->priv;
790
791 /*
792 * Special case: Got UC_RCRESET on setmode.
793 * This means that remote side isn't setup. In this case
794 * simply retry after some 10 secs...
795 */
796 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
797 ((event == CTC_EVENT_UC_RCRESET) ||
798 (event == CTC_EVENT_UC_RSRESET))) {
799 fsm_newstate(fi, CTC_STATE_STARTRETRY);
800 fsm_deltimer(&ch->timer);
801 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
802 if (!IS_MPC(ch) && (CHANNEL_DIRECTION(ch->flags) == 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 error during %s channel setup state=%s\n",
813 dev->name, ctc_ch_event_names[event],
814 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
815 fsm_getstate_str(fi));
816
817 if (CHANNEL_DIRECTION(ch->flags) == 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, __FUNCTION__);
842 fsm_deltimer(&ch->timer);
843 ctcm_pr_debug("%s: %s channel restart\n", dev->name,
844 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
845 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
846 oldstate = fsm_getstate(fi);
847 fsm_newstate(fi, CTC_STATE_STARTWAIT);
848 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
849 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
850 /* Such conditional locking is a known problem for
851 * sparse because its undeterministic in static view.
852 * Warnings should be ignored here. */
853 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
854 if (event == CTC_EVENT_TIMER)
855 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
856 if (rc != 0) {
857 if (rc != -EBUSY) {
858 fsm_deltimer(&ch->timer);
859 fsm_newstate(fi, oldstate);
860 }
861 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
862 }
863}
864
865/**
866 * Handle error during RX initial handshake (exchange of
867 * 0-length block header)
868 *
869 * fi An instance of a channel statemachine.
870 * event The event, just happened.
871 * arg Generic pointer, casted from channel * upon call.
872 */
873static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
874{
875 struct channel *ch = arg;
876 struct net_device *dev = ch->netdev;
877 struct ctcm_priv *priv = dev->priv;
878
879 CTCM_DBF_TEXT(SETUP, 3, __FUNCTION__);
880 if (event == CTC_EVENT_TIMER) {
881 if (!IS_MPCDEV(dev))
882 /* TODO : check if MPC deletes timer somewhere */
883 fsm_deltimer(&ch->timer);
884 ctcm_pr_debug("%s: Timeout during RX init handshake\n",
885 dev->name);
886 if (ch->retry++ < 3)
887 ctcm_chx_restart(fi, event, arg);
888 else {
889 fsm_newstate(fi, CTC_STATE_RXERR);
890 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
891 }
892 } else
893 ctcm_pr_warn("%s: Error during RX init handshake\n", dev->name);
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->priv;
909
910 CTCM_DBF_TEXT(SETUP, 3, __FUNCTION__);
911 fsm_newstate(fi, CTC_STATE_RXERR);
912 ctcm_pr_warn("%s: RX busy. Initialization failed\n", dev->name);
913 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
914}
915
916/**
917 * Handle RX Unit check remote reset (remote disconnected)
918 *
919 * fi An instance of a channel statemachine.
920 * event The event, just happened.
921 * arg Generic pointer, casted from channel * upon call.
922 */
923static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
924{
925 struct channel *ch = arg;
926 struct channel *ch2;
927 struct net_device *dev = ch->netdev;
928 struct ctcm_priv *priv = dev->priv;
929
930 CTCM_DBF_DEV_NAME(TRACE, dev, "Got remote disconnect, re-initializing");
931 fsm_deltimer(&ch->timer);
932 if (do_debug)
933 ctcm_pr_debug("%s: Got remote disconnect, "
934 "re-initializing ...\n", dev->name);
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[WRITE];
943 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
944
945 ccw_device_halt(ch->cdev, (unsigned long)ch);
946 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
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->priv;
961
962 if (event == CTC_EVENT_TIMER) {
963 fsm_deltimer(&ch->timer);
964 CTCM_DBF_DEV_NAME(ERROR, dev,
965 "Timeout during TX init handshake");
966 if (ch->retry++ < 3)
967 ctcm_chx_restart(fi, event, arg);
968 else {
969 fsm_newstate(fi, CTC_STATE_TXERR);
970 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
971 }
972 } else {
973 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
974 "%s : %s error during channel setup state=%s",
975 dev->name, ctc_ch_event_names[event],
976 fsm_getstate_str(fi));
977
978 ctcm_pr_warn("%s: Error during TX init handshake\n", dev->name);
979 }
980}
981
982/**
983 * Handle TX timeout by retrying operation.
984 *
985 * fi An instance of a channel statemachine.
986 * event The event, just happened.
987 * arg Generic pointer, casted from channel * upon call.
988 */
989static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
990{
991 struct channel *ch = arg;
992 struct net_device *dev = ch->netdev;
993 struct ctcm_priv *priv = dev->priv;
994 struct sk_buff *skb;
995
996 if (do_debug)
997 ctcm_pr_debug("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
998 __FUNCTION__, smp_processor_id(), ch, ch->id);
999
1000 fsm_deltimer(&ch->timer);
1001 if (ch->retry++ > 3) {
1002 struct mpc_group *gptr = priv->mpcg;
1003 ctcm_pr_debug("%s: TX retry failed, restarting channel\n",
1004 dev->name);
1005 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1006 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1007 use gptr as mpc indicator */
1008 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1009 ctcm_chx_restart(fi, event, arg);
1010 goto done;
1011 }
1012
1013 ctcm_pr_debug("%s: TX retry %d\n", dev->name, ch->retry);
1014 skb = skb_peek(&ch->io_queue);
1015 if (skb) {
1016 int rc = 0;
1017 unsigned long saveflags = 0;
1018 clear_normalized_cda(&ch->ccw[4]);
1019 ch->ccw[4].count = skb->len;
1020 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1021 ctcm_pr_debug("%s: IDAL alloc failed, chan restart\n",
1022 dev->name);
1023 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1024 ctcm_chx_restart(fi, event, arg);
1025 goto done;
1026 }
1027 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1028 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1029 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1030 /* Such conditional locking is a known problem for
1031 * sparse because its undeterministic in static view.
1032 * Warnings should be ignored here. */
1033 if (do_debug_ccw)
1034 ctcmpc_dumpit((char *)&ch->ccw[3],
1035 sizeof(struct ccw1) * 3);
1036
1037 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1038 (unsigned long)ch, 0xff, 0);
1039 if (event == CTC_EVENT_TIMER)
1040 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1041 saveflags);
1042 if (rc != 0) {
1043 fsm_deltimer(&ch->timer);
1044 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1045 ctcm_purge_skb_queue(&ch->io_queue);
1046 }
1047 }
1048done:
1049 return;
1050}
1051
1052/**
1053 * Handle fatal errors during an I/O command.
1054 *
1055 * fi An instance of a channel statemachine.
1056 * event The event, just happened.
1057 * arg Generic pointer, casted from channel * upon call.
1058 */
1059static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1060{
1061 struct channel *ch = arg;
1062 struct net_device *dev = ch->netdev;
1063 struct ctcm_priv *priv = dev->priv;
1064
1065 CTCM_DBF_TEXT(TRACE, 3, __FUNCTION__);
1066 fsm_deltimer(&ch->timer);
1067 ctcm_pr_warn("%s %s : unrecoverable channel error\n",
1068 CTC_DRIVER_NAME, dev->name);
1069 if (IS_MPC(ch)) {
1070 priv->stats.tx_dropped++;
1071 priv->stats.tx_errors++;
1072 }
1073
1074 if (CHANNEL_DIRECTION(ch->flags) == READ) {
1075 ctcm_pr_debug("%s: RX I/O error\n", dev->name);
1076 fsm_newstate(fi, CTC_STATE_RXERR);
1077 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1078 } else {
1079 ctcm_pr_debug("%s: TX I/O error\n", dev->name);
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->priv;
1215 struct mpc_group *grp = priv->mpcg;
1216 struct sk_buff *skb;
1217 int first = 1;
1218 int i;
1219 struct timespec done_stamp;
1220 __u32 data_space;
1221 unsigned long duration;
1222 struct sk_buff *peekskb;
1223 int rc;
1224 struct th_header *header;
1225 struct pdu *p_header;
1226
1227 if (do_debug)
1228 ctcm_pr_debug("%s cp:%i enter: %s()\n",
1229 dev->name, smp_processor_id(), __FUNCTION__);
1230
1231 done_stamp = current_kernel_time(); /* xtime */
1232 duration = (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000
1233 + (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1234 if (duration > ch->prof.tx_time)
1235 ch->prof.tx_time = duration;
1236
1237 if (ch->irb->scsw.count != 0)
1238 ctcm_pr_debug("%s: TX not complete, remaining %d bytes\n",
1239 dev->name, ch->irb->scsw.count);
1240 fsm_deltimer(&ch->timer);
1241 while ((skb = skb_dequeue(&ch->io_queue))) {
1242 priv->stats.tx_packets++;
1243 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1244 if (first) {
1245 priv->stats.tx_bytes += 2;
1246 first = 0;
1247 }
1248 atomic_dec(&skb->users);
1249 dev_kfree_skb_irq(skb);
1250 }
1251 spin_lock(&ch->collect_lock);
1252 clear_normalized_cda(&ch->ccw[4]);
1253
1254 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1255 spin_unlock(&ch->collect_lock);
1256 fsm_newstate(fi, CTC_STATE_TXIDLE);
1257 goto done;
1258 }
1259
1260 if (ctcm_checkalloc_buffer(ch)) {
1261 spin_unlock(&ch->collect_lock);
1262 goto done;
1263 }
1264 ch->trans_skb->data = ch->trans_skb_data;
1265 skb_reset_tail_pointer(ch->trans_skb);
1266 ch->trans_skb->len = 0;
1267 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1268 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1269 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1270 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1271 i = 0;
1272
1273 if (do_debug_data)
1274 ctcm_pr_debug("ctcmpc: %s() building "
1275 "trans_skb from collect_q \n", __FUNCTION__);
1276
1277 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1278
1279 if (do_debug_data)
1280 ctcm_pr_debug("ctcmpc: %s() building trans_skb from collect_q"
1281 " data_space:%04x\n", __FUNCTION__, data_space);
1282 p_header = NULL;
1283 while ((skb = skb_dequeue(&ch->collect_queue))) {
1284 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1285 p_header = (struct pdu *)
1286 (skb_tail_pointer(ch->trans_skb) - skb->len);
1287 p_header->pdu_flag = 0x00;
1288 if (skb->protocol == ntohs(ETH_P_SNAP))
1289 p_header->pdu_flag |= 0x60;
1290 else
1291 p_header->pdu_flag |= 0x20;
1292
1293 if (do_debug_data) {
1294 ctcm_pr_debug("ctcmpc: %s()trans_skb len:%04x \n",
1295 __FUNCTION__, ch->trans_skb->len);
1296 ctcm_pr_debug("ctcmpc: %s() pdu header and data"
1297 " for up to 32 bytes sent to vtam\n",
1298 __FUNCTION__);
1299 ctcmpc_dumpit((char *)p_header,
1300 min_t(int, skb->len, 32));
1301 }
1302 ch->collect_len -= skb->len;
1303 data_space -= skb->len;
1304 priv->stats.tx_packets++;
1305 priv->stats.tx_bytes += skb->len;
1306 atomic_dec(&skb->users);
1307 dev_kfree_skb_any(skb);
1308 peekskb = skb_peek(&ch->collect_queue);
1309 if (peekskb->len > data_space)
1310 break;
1311 i++;
1312 }
1313 /* p_header points to the last one we handled */
1314 if (p_header)
1315 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1316 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1317
1318 if (!header) {
1319 printk(KERN_WARNING "ctcmpc: OUT OF MEMORY IN %s()"
1320 ": Data Lost \n", __FUNCTION__);
1321 spin_unlock(&ch->collect_lock);
1322 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1323 goto done;
1324 }
1325
1326 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1327 ch->th_seq_num++;
1328 header->th_seq_num = ch->th_seq_num;
1329
1330 if (do_debug_data)
1331 ctcm_pr_debug("%s: ToVTAM_th_seq= %08x\n" ,
1332 __FUNCTION__, ch->th_seq_num);
1333
1334 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1335 TH_HEADER_LENGTH); /* put the TH on the packet */
1336
1337 kfree(header);
1338
1339 if (do_debug_data) {
1340 ctcm_pr_debug("ctcmpc: %s()trans_skb len:%04x \n",
1341 __FUNCTION__, ch->trans_skb->len);
1342
1343 ctcm_pr_debug("ctcmpc: %s() up-to-50 bytes of trans_skb "
1344 "data to vtam from collect_q\n", __FUNCTION__);
1345 ctcmpc_dumpit((char *)ch->trans_skb->data,
1346 min_t(int, ch->trans_skb->len, 50));
1347 }
1348
1349 spin_unlock(&ch->collect_lock);
1350 clear_normalized_cda(&ch->ccw[1]);
1351 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1352 dev_kfree_skb_any(ch->trans_skb);
1353 ch->trans_skb = NULL;
1354 printk(KERN_WARNING
1355 "ctcmpc: %s()CCW failure - data lost\n",
1356 __FUNCTION__);
1357 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1358 return;
1359 }
1360 ch->ccw[1].count = ch->trans_skb->len;
1361 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1362 ch->prof.send_stamp = current_kernel_time(); /* xtime */
1363 if (do_debug_ccw)
1364 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1365 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1366 (unsigned long)ch, 0xff, 0);
1367 ch->prof.doios_multi++;
1368 if (rc != 0) {
1369 priv->stats.tx_dropped += i;
1370 priv->stats.tx_errors += i;
1371 fsm_deltimer(&ch->timer);
1372 ctcm_ccw_check_rc(ch, rc, "chained TX");
1373 }
1374done:
1375 ctcm_clear_busy(dev);
1376 ctcm_pr_debug("ctcmpc exit: %s %s()\n", dev->name, __FUNCTION__);
1377 return;
1378}
1379
1380/**
1381 * Got normal data, check for sanity, queue it up, allocate new buffer
1382 * trigger bottom half, and initiate next read.
1383 *
1384 * fi An instance of a channel statemachine.
1385 * event The event, just happened.
1386 * arg Generic pointer, casted from channel * upon call.
1387 */
1388static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1389{
1390 struct channel *ch = arg;
1391 struct net_device *dev = ch->netdev;
1392 struct ctcm_priv *priv = dev->priv;
1393 struct mpc_group *grp = priv->mpcg;
1394 struct sk_buff *skb = ch->trans_skb;
1395 struct sk_buff *new_skb;
1396 unsigned long saveflags = 0; /* avoids compiler warning */
1397 int len = ch->max_bufsize - ch->irb->scsw.count;
1398
1399 if (do_debug_data) {
1400 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, "mpc_ch_rx %s cp:%i %s\n",
1401 dev->name, smp_processor_id(), ch->id);
1402 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, "mpc_ch_rx: maxbuf: %04x "
1403 "len: %04x\n", ch->max_bufsize, len);
1404 }
1405 fsm_deltimer(&ch->timer);
1406
1407 if (skb == NULL) {
1408 ctcm_pr_debug("ctcmpc exit: %s() TRANS_SKB = NULL \n",
1409 __FUNCTION__);
1410 goto again;
1411 }
1412
1413 if (len < TH_HEADER_LENGTH) {
1414 ctcm_pr_info("%s: got packet with invalid length %d\n",
1415 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 printk(KERN_INFO "ctcmpc:%s() NEW_SKB = NULL\n",
1426 __FUNCTION__);
1427 printk(KERN_WARNING "ctcmpc: %s() MEMORY ALLOC FAILED"
1428 " - DATA LOST - MPC FAILED\n",
1429 __FUNCTION__);
1430 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1431 goto again;
1432 }
1433 switch (fsm_getstate(grp->fsm)) {
1434 case MPCG_STATE_RESET:
1435 case MPCG_STATE_INOP:
1436 dev_kfree_skb_any(new_skb);
1437 break;
1438 case MPCG_STATE_FLOWC:
1439 case MPCG_STATE_READY:
1440 memcpy(skb_put(new_skb, block_len),
1441 skb->data, block_len);
1442 skb_queue_tail(&ch->io_queue, new_skb);
1443 tasklet_schedule(&ch->ch_tasklet);
1444 break;
1445 default:
1446 memcpy(skb_put(new_skb, len), skb->data, len);
1447 skb_queue_tail(&ch->io_queue, new_skb);
1448 tasklet_hi_schedule(&ch->ch_tasklet);
1449 break;
1450 }
1451 }
1452
1453again:
1454 switch (fsm_getstate(grp->fsm)) {
1455 int rc, dolock;
1456 case MPCG_STATE_FLOWC:
1457 case MPCG_STATE_READY:
1458 if (ctcm_checkalloc_buffer(ch))
1459 break;
1460 ch->trans_skb->data = ch->trans_skb_data;
1461 skb_reset_tail_pointer(ch->trans_skb);
1462 ch->trans_skb->len = 0;
1463 ch->ccw[1].count = ch->max_bufsize;
1464 if (do_debug_ccw)
1465 ctcmpc_dumpit((char *)&ch->ccw[0],
1466 sizeof(struct ccw1) * 3);
1467 dolock = !in_irq();
1468 if (dolock)
1469 spin_lock_irqsave(
1470 get_ccwdev_lock(ch->cdev), saveflags);
1471 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1472 (unsigned long)ch, 0xff, 0);
1473 if (dolock) /* see remark about conditional locking */
1474 spin_unlock_irqrestore(
1475 get_ccwdev_lock(ch->cdev), saveflags);
1476 if (rc != 0)
1477 ctcm_ccw_check_rc(ch, rc, "normal RX");
1478 default:
1479 break;
1480 }
1481
1482 if (do_debug)
1483 ctcm_pr_debug("ctcmpc exit : %s %s(): ch=0x%p id=%s\n",
1484 dev->name, __FUNCTION__, ch, ch->id);
1485
1486}
1487
1488/**
1489 * Initialize connection by sending a __u16 of value 0.
1490 *
1491 * fi An instance of a channel statemachine.
1492 * event The event, just happened.
1493 * arg Generic pointer, casted from channel * upon call.
1494 */
1495static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1496{
1497 struct channel *ch = arg;
1498 struct net_device *dev = ch->netdev;
1499 struct ctcm_priv *priv = dev->priv;
1500
1501 if (do_debug) {
1502 struct mpc_group *gptr = priv->mpcg;
1503 ctcm_pr_debug("ctcmpc enter: %s(): ch=0x%p id=%s\n",
1504 __FUNCTION__, ch, ch->id);
1505 ctcm_pr_debug("%s() %s chstate:%i grpstate:%i chprotocol:%i\n",
1506 __FUNCTION__, ch->id, fsm_getstate(fi),
1507 fsm_getstate(gptr->fsm), ch->protocol);
1508 }
1509 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1510 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1511
1512 fsm_deltimer(&ch->timer);
1513 if (ctcm_checkalloc_buffer(ch))
1514 goto done;
1515
1516 switch (fsm_getstate(fi)) {
1517 case CTC_STATE_STARTRETRY:
1518 case CTC_STATE_SETUPWAIT:
1519 if (CHANNEL_DIRECTION(ch->flags) == READ) {
1520 ctcmpc_chx_rxidle(fi, event, arg);
1521 } else {
1522 fsm_newstate(fi, CTC_STATE_TXIDLE);
1523 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1524 }
1525 goto done;
1526 default:
1527 break;
1528 };
1529
1530 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
1531 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1532
1533done:
1534 if (do_debug)
1535 ctcm_pr_debug("ctcmpc exit : %s(): ch=0x%p id=%s\n",
1536 __FUNCTION__, ch, ch->id);
1537 return;
1538}
1539
1540/**
1541 * Got initial data, check it. If OK,
1542 * notify device statemachine that we are up and
1543 * running.
1544 *
1545 * fi An instance of a channel statemachine.
1546 * event The event, just happened.
1547 * arg Generic pointer, casted from channel * upon call.
1548 */
1549void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1550{
1551 struct channel *ch = arg;
1552 struct net_device *dev = ch->netdev;
1553 struct ctcm_priv *priv = dev->priv;
1554 struct mpc_group *grp = priv->mpcg;
1555 int rc;
1556 unsigned long saveflags = 0; /* avoids compiler warning */
1557
1558 fsm_deltimer(&ch->timer);
1559 ctcm_pr_debug("%s cp:%i enter: %s()\n",
1560 dev->name, smp_processor_id(), __FUNCTION__);
1561 if (do_debug)
1562 ctcm_pr_debug("%s() %s chstate:%i grpstate:%i\n",
1563 __FUNCTION__, ch->id,
1564 fsm_getstate(fi), fsm_getstate(grp->fsm));
1565
1566 fsm_newstate(fi, CTC_STATE_RXIDLE);
1567 /* XID processing complete */
1568
1569 switch (fsm_getstate(grp->fsm)) {
1570 case MPCG_STATE_FLOWC:
1571 case MPCG_STATE_READY:
1572 if (ctcm_checkalloc_buffer(ch))
1573 goto done;
1574 ch->trans_skb->data = ch->trans_skb_data;
1575 skb_reset_tail_pointer(ch->trans_skb);
1576 ch->trans_skb->len = 0;
1577 ch->ccw[1].count = ch->max_bufsize;
1578 if (do_debug_ccw)
1579 ctcmpc_dumpit((char *)&ch->ccw[0],
1580 sizeof(struct ccw1) * 3);
1581 if (event == CTC_EVENT_START)
1582 /* see remark about conditional locking */
1583 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1584 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1585 (unsigned long)ch, 0xff, 0);
1586 if (event == CTC_EVENT_START)
1587 spin_unlock_irqrestore(
1588 get_ccwdev_lock(ch->cdev), saveflags);
1589 if (rc != 0) {
1590 fsm_newstate(fi, CTC_STATE_RXINIT);
1591 ctcm_ccw_check_rc(ch, rc, "initial RX");
1592 goto done;
1593 }
1594 break;
1595 default:
1596 break;
1597 }
1598
1599 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1600done:
1601 if (do_debug)
1602 ctcm_pr_debug("ctcmpc exit: %s %s()\n",
1603 dev->name, __FUNCTION__);
1604 return;
1605}
1606
1607/*
1608 * ctcmpc channel FSM action
1609 * called from several points in ctcmpc_ch_fsm
1610 * ctcmpc only
1611 */
1612static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1613{
1614 struct channel *ch = arg;
1615 struct net_device *dev = ch->netdev;
1616 struct ctcm_priv *priv = dev->priv;
1617 struct mpc_group *grp = priv->mpcg;
1618
1619 if (do_debug) {
1620 ctcm_pr_debug("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s"
1621 "GrpState:%s ChState:%s\n",
1622 __FUNCTION__, smp_processor_id(), ch, ch->id,
1623 fsm_getstate_str(grp->fsm),
1624 fsm_getstate_str(ch->fsm));
1625 }
1626
1627 switch (fsm_getstate(grp->fsm)) {
1628 case MPCG_STATE_XID2INITW:
1629 /* ok..start yside xid exchanges */
1630 if (!ch->in_mpcgroup)
1631 break;
1632 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1633 fsm_deltimer(&grp->timer);
1634 fsm_addtimer(&grp->timer,
1635 MPC_XID_TIMEOUT_VALUE,
1636 MPCG_EVENT_TIMER, dev);
1637 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1638
1639 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1640 /* attn rcvd before xid0 processed via bh */
1641 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1642 break;
1643 case MPCG_STATE_XID2INITX:
1644 case MPCG_STATE_XID0IOWAIT:
1645 case MPCG_STATE_XID0IOWAIX:
1646 /* attn rcvd before xid0 processed on ch
1647 but mid-xid0 processing for group */
1648 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1649 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1650 break;
1651 case MPCG_STATE_XID7INITW:
1652 case MPCG_STATE_XID7INITX:
1653 case MPCG_STATE_XID7INITI:
1654 case MPCG_STATE_XID7INITZ:
1655 switch (fsm_getstate(ch->fsm)) {
1656 case CH_XID7_PENDING:
1657 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1658 break;
1659 case CH_XID7_PENDING2:
1660 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1661 break;
1662 }
1663 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1664 break;
1665 }
1666
1667 if (do_debug)
1668 ctcm_pr_debug("ctcmpc exit : %s(): cp=%i ch=0x%p id=%s\n",
1669 __FUNCTION__, smp_processor_id(), ch, ch->id);
1670 return;
1671
1672}
1673
1674/*
1675 * ctcmpc channel FSM action
1676 * called from one point in ctcmpc_ch_fsm
1677 * ctcmpc only
1678 */
1679static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1680{
1681 struct channel *ch = arg;
1682 struct net_device *dev = ch->netdev;
1683 struct ctcm_priv *priv = dev->priv;
1684 struct mpc_group *grp = priv->mpcg;
1685
1686 ctcm_pr_debug("ctcmpc enter: %s %s() %s \nGrpState:%s ChState:%s\n",
1687 dev->name,
1688 __FUNCTION__, ch->id,
1689 fsm_getstate_str(grp->fsm),
1690 fsm_getstate_str(ch->fsm));
1691
1692 fsm_deltimer(&ch->timer);
1693
1694 switch (fsm_getstate(grp->fsm)) {
1695 case MPCG_STATE_XID0IOWAIT:
1696 /* vtam wants to be primary.start yside xid exchanges*/
1697 /* only receive one attn-busy at a time so must not */
1698 /* change state each time */
1699 grp->changed_side = 1;
1700 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1701 break;
1702 case MPCG_STATE_XID2INITW:
1703 if (grp->changed_side == 1) {
1704 grp->changed_side = 2;
1705 break;
1706 }
1707 /* process began via call to establish_conn */
1708 /* so must report failure instead of reverting */
1709 /* back to ready-for-xid passive state */
1710 if (grp->estconnfunc)
1711 goto done;
1712 /* this attnbusy is NOT the result of xside xid */
1713 /* collisions so yside must have been triggered */
1714 /* by an ATTN that was not intended to start XID */
1715 /* processing. Revert back to ready-for-xid and */
1716 /* wait for ATTN interrupt to signal xid start */
1717 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1718 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1719 fsm_deltimer(&grp->timer);
1720 goto done;
1721 }
1722 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1723 goto done;
1724 case MPCG_STATE_XID2INITX:
1725 /* XID2 was received before ATTN Busy for second
1726 channel.Send yside xid for second channel.
1727 */
1728 if (grp->changed_side == 1) {
1729 grp->changed_side = 2;
1730 break;
1731 }
1732 case MPCG_STATE_XID0IOWAIX:
1733 case MPCG_STATE_XID7INITW:
1734 case MPCG_STATE_XID7INITX:
1735 case MPCG_STATE_XID7INITI:
1736 case MPCG_STATE_XID7INITZ:
1737 default:
1738 /* multiple attn-busy indicates too out-of-sync */
1739 /* and they are certainly not being received as part */
1740 /* of valid mpc group negotiations.. */
1741 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1742 goto done;
1743 }
1744
1745 if (grp->changed_side == 1) {
1746 fsm_deltimer(&grp->timer);
1747 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1748 MPCG_EVENT_TIMER, dev);
1749 }
1750 if (ch->in_mpcgroup)
1751 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1752 else
1753 printk(KERN_WARNING "ctcmpc: %s() Not all channels have"
1754 " been added to group\n", __FUNCTION__);
1755
1756done:
1757 if (do_debug)
1758 ctcm_pr_debug("ctcmpc exit : %s()%s ch=0x%p id=%s\n",
1759 __FUNCTION__, dev->name, ch, ch->id);
1760
1761 return;
1762
1763}
1764
1765/*
1766 * ctcmpc channel FSM action
1767 * called from several points in ctcmpc_ch_fsm
1768 * ctcmpc only
1769 */
1770static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1771{
1772 struct channel *ch = arg;
1773 struct net_device *dev = ch->netdev;
1774 struct ctcm_priv *priv = dev->priv;
1775 struct mpc_group *grp = priv->mpcg;
1776
1777 ctcm_pr_debug("ctcmpc enter: %s %s() %s \nGrpState:%s ChState:%s\n",
1778 dev->name, __FUNCTION__, ch->id,
1779 fsm_getstate_str(grp->fsm),
1780 fsm_getstate_str(ch->fsm));
1781
1782 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1783
1784 return;
1785}
1786
1787/*
1788 * ctcmpc channel FSM action
1789 * called from several points in ctcmpc_ch_fsm
1790 * ctcmpc only
1791 */
1792static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1793{
1794 struct channel *ach = arg;
1795 struct net_device *dev = ach->netdev;
1796 struct ctcm_priv *priv = dev->priv;
1797 struct mpc_group *grp = priv->mpcg;
1798 struct channel *wch = priv->channel[WRITE];
1799 struct channel *rch = priv->channel[READ];
1800 struct sk_buff *skb;
1801 struct th_sweep *header;
1802 int rc = 0;
1803 unsigned long saveflags = 0;
1804
1805 if (do_debug)
1806 ctcm_pr_debug("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1807 __FUNCTION__, smp_processor_id(), ach, ach->id);
1808
1809 if (grp->in_sweep == 0)
1810 goto done;
1811
1812 if (do_debug_data) {
1813 ctcm_pr_debug("ctcmpc: %s() 1: ToVTAM_th_seq= %08x\n" ,
1814 __FUNCTION__, wch->th_seq_num);
1815 ctcm_pr_debug("ctcmpc: %s() 1: FromVTAM_th_seq= %08x\n" ,
1816 __FUNCTION__, rch->th_seq_num);
1817 }
1818
1819 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1820 /* give the previous IO time to complete */
1821 fsm_addtimer(&wch->sweep_timer,
1822 200, CTC_EVENT_RSWEEP_TIMER, wch);
1823 goto done;
1824 }
1825
1826 skb = skb_dequeue(&wch->sweep_queue);
1827 if (!skb)
1828 goto done;
1829
1830 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1831 grp->in_sweep = 0;
1832 ctcm_clear_busy_do(dev);
1833 dev_kfree_skb_any(skb);
1834 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1835 goto done;
1836 } else {
1837 atomic_inc(&skb->users);
1838 skb_queue_tail(&wch->io_queue, skb);
1839 }
1840
1841 /* send out the sweep */
1842 wch->ccw[4].count = skb->len;
1843
1844 header = (struct th_sweep *)skb->data;
1845 switch (header->th.th_ch_flag) {
1846 case TH_SWEEP_REQ:
1847 grp->sweep_req_pend_num--;
1848 break;
1849 case TH_SWEEP_RESP:
1850 grp->sweep_rsp_pend_num--;
1851 break;
1852 }
1853
1854 header->sw.th_last_seq = wch->th_seq_num;
1855
1856 if (do_debug_ccw)
1857 ctcmpc_dumpit((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1858
1859 ctcm_pr_debug("ctcmpc: %s() sweep packet\n", __FUNCTION__);
1860 ctcmpc_dumpit((char *)header, TH_SWEEP_LENGTH);
1861
1862 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1863 fsm_newstate(wch->fsm, CTC_STATE_TX);
1864
1865 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1866 wch->prof.send_stamp = current_kernel_time(); /* xtime */
1867 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1868 (unsigned long) wch, 0xff, 0);
1869 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1870
1871 if ((grp->sweep_req_pend_num == 0) &&
1872 (grp->sweep_rsp_pend_num == 0)) {
1873 grp->in_sweep = 0;
1874 rch->th_seq_num = 0x00;
1875 wch->th_seq_num = 0x00;
1876 ctcm_clear_busy_do(dev);
1877 }
1878
1879 if (do_debug_data) {
1880 ctcm_pr_debug("ctcmpc: %s()2: ToVTAM_th_seq= %08x\n" ,
1881 __FUNCTION__, wch->th_seq_num);
1882 ctcm_pr_debug("ctcmpc: %s()2: FromVTAM_th_seq= %08x\n" ,
1883 __FUNCTION__, rch->th_seq_num);
1884 }
1885
1886 if (rc != 0)
1887 ctcm_ccw_check_rc(wch, rc, "send sweep");
1888
1889done:
1890 if (do_debug)
1891 ctcm_pr_debug("ctcmpc exit: %s() %s\n", __FUNCTION__, ach->id);
1892 return;
1893}
1894
1895
1896/*
1897 * The ctcmpc statemachine for a channel.
1898 */
1899
1900const fsm_node ctcmpc_ch_fsm[] = {
1901 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1902 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1903 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1904 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1905 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1906
1907 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1908 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1909 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1910 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1911 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1912 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1913 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1914 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1915
1916 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1917 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1918 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1919 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1920 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1921 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1922
1923 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1924 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1925 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1926 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1927 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1928
1929 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1930 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1931 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1932 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1933 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1934 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1935 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1936 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1937
1938 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1939 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1940 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1941 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1942 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1943 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1944 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1945 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1946 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1947 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1948
1949 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1950 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1951 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1952 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1953 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1954 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1955 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1956 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1957 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1958 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1959
1960 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1961 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1962 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1963 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1964 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1965 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1966 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1967 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1968 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1969 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1970 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1971
1972 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1973 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1974 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1975 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1976 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1977 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1978 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1979 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1980 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1981 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1982 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1983 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1984 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1985
1986 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1987 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1988 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1989 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1990 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1991 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1992 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1993 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1994 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1995 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1996 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1997 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1998
1999 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
2000 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
2001 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
2002 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
2003 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2004 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2005 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2006 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
2007 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
2008 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
2009 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
2010 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2011
2012 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
2013 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
2014 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
2015 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
2016 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2017 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2018 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2019 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
2020 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
2021 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
2022 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
2023 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2024
2025 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
2026 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
2027 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
2028 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
2029 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2030 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2031 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2032 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
2033 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
2034 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
2035 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
2036 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2037
2038 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2039 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
2040 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
2041 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
2042 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2043 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2044 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2045 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2046
2047 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
2048 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
2049 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
2050 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2051 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2052 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2053 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2054 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2055 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2056
2057 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2058 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2059 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2060 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2061 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2062 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2063 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2064 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2065
2066 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2067 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2068 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2069 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2070 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2071 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2072 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2073 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2074
2075 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2076 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2077 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2078 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2079 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2080 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2081 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2082
2083 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2084 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2085 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2086 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2087 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2088 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2089 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2090 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2091 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2092 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2093
2094 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2095 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2096 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2097 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2098 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2099};
2100
2101int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2102
2103/*
2104 * Actions for interface - statemachine.
2105 */
2106
2107/**
2108 * Startup channels by sending CTC_EVENT_START to each channel.
2109 *
2110 * fi An instance of an interface statemachine.
2111 * event The event, just happened.
2112 * arg Generic pointer, casted from struct net_device * upon call.
2113 */
2114static void dev_action_start(fsm_instance *fi, int event, void *arg)
2115{
2116 struct net_device *dev = arg;
2117 struct ctcm_priv *priv = dev->priv;
2118 int direction;
2119
2120 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2121
2122 fsm_deltimer(&priv->restart_timer);
2123 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2124 if (IS_MPC(priv))
2125 priv->mpcg->channels_terminating = 0;
2126 for (direction = READ; direction <= WRITE; direction++) {
2127 struct channel *ch = priv->channel[direction];
2128 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2129 }
2130}
2131
2132/**
2133 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2134 *
2135 * fi An instance of an interface statemachine.
2136 * event The event, just happened.
2137 * arg Generic pointer, casted from struct net_device * upon call.
2138 */
2139static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2140{
2141 int direction;
2142 struct net_device *dev = arg;
2143 struct ctcm_priv *priv = dev->priv;
2144
2145 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2146
2147 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2148 for (direction = READ; direction <= WRITE; direction++) {
2149 struct channel *ch = priv->channel[direction];
2150 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2151 ch->th_seq_num = 0x00;
2152 if (do_debug)
2153 ctcm_pr_debug("ctcm: %s() CH_th_seq= %08x\n",
2154 __FUNCTION__, ch->th_seq_num);
2155 }
2156 if (IS_MPC(priv))
2157 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2158}
2159
2160static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2161{
2162 int restart_timer;
2163 struct net_device *dev = arg;
2164 struct ctcm_priv *priv = dev->priv;
2165
2166 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2167
2168 if (IS_MPC(priv)) {
2169 ctcm_pr_info("ctcm: %s Restarting Device and "
2170 "MPC Group in 5 seconds\n",
2171 dev->name);
2172 restart_timer = CTCM_TIME_1_SEC;
2173 } else {
2174 ctcm_pr_info("%s: Restarting\n", dev->name);
2175 restart_timer = CTCM_TIME_5_SEC;
2176 }
2177
2178 dev_action_stop(fi, event, arg);
2179 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2180 if (IS_MPC(priv))
2181 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2182
2183 /* going back into start sequence too quickly can */
2184 /* result in the other side becoming unreachable due */
2185 /* to sense reported when IO is aborted */
2186 fsm_addtimer(&priv->restart_timer, restart_timer,
2187 DEV_EVENT_START, dev);
2188}
2189
2190/**
2191 * Called from channel statemachine
2192 * when a channel is up and running.
2193 *
2194 * fi An instance of an interface statemachine.
2195 * event The event, just happened.
2196 * arg Generic pointer, casted from struct net_device * upon call.
2197 */
2198static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2199{
2200 struct net_device *dev = arg;
2201 struct ctcm_priv *priv = dev->priv;
2202
2203 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2204
2205 switch (fsm_getstate(fi)) {
2206 case DEV_STATE_STARTWAIT_RXTX:
2207 if (event == DEV_EVENT_RXUP)
2208 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2209 else
2210 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2211 break;
2212 case DEV_STATE_STARTWAIT_RX:
2213 if (event == DEV_EVENT_RXUP) {
2214 fsm_newstate(fi, DEV_STATE_RUNNING);
2215 ctcm_pr_info("%s: connected with remote side\n",
2216 dev->name);
2217 ctcm_clear_busy(dev);
2218 }
2219 break;
2220 case DEV_STATE_STARTWAIT_TX:
2221 if (event == DEV_EVENT_TXUP) {
2222 fsm_newstate(fi, DEV_STATE_RUNNING);
2223 ctcm_pr_info("%s: connected with remote side\n",
2224 dev->name);
2225 ctcm_clear_busy(dev);
2226 }
2227 break;
2228 case DEV_STATE_STOPWAIT_TX:
2229 if (event == DEV_EVENT_RXUP)
2230 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2231 break;
2232 case DEV_STATE_STOPWAIT_RX:
2233 if (event == DEV_EVENT_TXUP)
2234 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2235 break;
2236 }
2237
2238 if (IS_MPC(priv)) {
2239 if (event == DEV_EVENT_RXUP)
2240 mpc_channel_action(priv->channel[READ],
2241 READ, MPC_CHANNEL_ADD);
2242 else
2243 mpc_channel_action(priv->channel[WRITE],
2244 WRITE, MPC_CHANNEL_ADD);
2245 }
2246}
2247
2248/**
2249 * Called from device statemachine
2250 * when a channel has been shutdown.
2251 *
2252 * fi An instance of an interface statemachine.
2253 * event The event, just happened.
2254 * arg Generic pointer, casted from struct net_device * upon call.
2255 */
2256static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2257{
2258
2259 struct net_device *dev = arg;
2260 struct ctcm_priv *priv = dev->priv;
2261
2262 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2263
2264 switch (fsm_getstate(fi)) {
2265 case DEV_STATE_RUNNING:
2266 if (event == DEV_EVENT_TXDOWN)
2267 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2268 else
2269 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2270 break;
2271 case DEV_STATE_STARTWAIT_RX:
2272 if (event == DEV_EVENT_TXDOWN)
2273 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2274 break;
2275 case DEV_STATE_STARTWAIT_TX:
2276 if (event == DEV_EVENT_RXDOWN)
2277 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2278 break;
2279 case DEV_STATE_STOPWAIT_RXTX:
2280 if (event == DEV_EVENT_TXDOWN)
2281 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2282 else
2283 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2284 break;
2285 case DEV_STATE_STOPWAIT_RX:
2286 if (event == DEV_EVENT_RXDOWN)
2287 fsm_newstate(fi, DEV_STATE_STOPPED);
2288 break;
2289 case DEV_STATE_STOPWAIT_TX:
2290 if (event == DEV_EVENT_TXDOWN)
2291 fsm_newstate(fi, DEV_STATE_STOPPED);
2292 break;
2293 }
2294 if (IS_MPC(priv)) {
2295 if (event == DEV_EVENT_RXDOWN)
2296 mpc_channel_action(priv->channel[READ],
2297 READ, MPC_CHANNEL_REMOVE);
2298 else
2299 mpc_channel_action(priv->channel[WRITE],
2300 WRITE, MPC_CHANNEL_REMOVE);
2301 }
2302}
2303
2304const fsm_node dev_fsm[] = {
2305 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2306 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2307 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2308 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2309 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2310 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2311 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2312 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2313 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2314 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2315 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2316 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2317 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2318 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2319 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2320 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2321 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2322 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2323 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2324 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2325 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2326 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2327 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2328 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2329 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2330 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2331 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2332 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2333 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2334 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2335 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2336 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2337 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2338 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2339 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2340 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2341 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2342};
2343
2344int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2345
2346/* --- This is the END my friend --- */
2347
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 20:56:03 -0500