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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 *)(u64)dma32_to_u32(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 *)(u64)dma32_to_u32(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
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2001, 2007
4 * Authors: Fritz Elfert (felfert@millenux.com)
5 * Peter Tiedemann (ptiedem@de.ibm.com)
6 * MPC additions :
7 * Belinda Thompson (belindat@us.ibm.com)
8 * Andy Richter (richtera@us.ibm.com)
9 */
10
11#undef DEBUG
12#undef DEBUGDATA
13#undef DEBUGCCW
14
15#define KMSG_COMPONENT "ctcm"
16#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
17
18#include <linux/module.h>
19#include <linux/init.h>
20#include <linux/kernel.h>
21#include <linux/slab.h>
22#include <linux/errno.h>
23#include <linux/types.h>
24#include <linux/interrupt.h>
25#include <linux/timer.h>
26#include <linux/bitops.h>
27
28#include <linux/signal.h>
29#include <linux/string.h>
30
31#include <linux/ip.h>
32#include <linux/if_arp.h>
33#include <linux/tcp.h>
34#include <linux/skbuff.h>
35#include <linux/ctype.h>
36#include <net/dst.h>
37
38#include <linux/io.h>
39#include <asm/ccwdev.h>
40#include <asm/ccwgroup.h>
41#include <linux/uaccess.h>
42
43#include <asm/idals.h>
44
45#include "fsm.h"
46
47#include "ctcm_dbug.h"
48#include "ctcm_main.h"
49#include "ctcm_fsms.h"
50
51const char *dev_state_names[] = {
52 [DEV_STATE_STOPPED] = "Stopped",
53 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX",
54 [DEV_STATE_STARTWAIT_RX] = "StartWait RX",
55 [DEV_STATE_STARTWAIT_TX] = "StartWait TX",
56 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX",
57 [DEV_STATE_STOPWAIT_RX] = "StopWait RX",
58 [DEV_STATE_STOPWAIT_TX] = "StopWait TX",
59 [DEV_STATE_RUNNING] = "Running",
60};
61
62const char *dev_event_names[] = {
63 [DEV_EVENT_START] = "Start",
64 [DEV_EVENT_STOP] = "Stop",
65 [DEV_EVENT_RXUP] = "RX up",
66 [DEV_EVENT_TXUP] = "TX up",
67 [DEV_EVENT_RXDOWN] = "RX down",
68 [DEV_EVENT_TXDOWN] = "TX down",
69 [DEV_EVENT_RESTART] = "Restart",
70};
71
72const char *ctc_ch_event_names[] = {
73 [CTC_EVENT_IO_SUCCESS] = "ccw_device success",
74 [CTC_EVENT_IO_EBUSY] = "ccw_device busy",
75 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev",
76 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown",
77 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY",
78 [CTC_EVENT_ATTN] = "Status ATTN",
79 [CTC_EVENT_BUSY] = "Status BUSY",
80 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset",
81 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset",
82 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
83 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
84 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure",
85 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
86 [CTC_EVENT_UC_ZERO] = "Unit check ZERO",
87 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown",
88 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown",
89 [CTC_EVENT_MC_FAIL] = "Machine check failure",
90 [CTC_EVENT_MC_GOOD] = "Machine check operational",
91 [CTC_EVENT_IRQ] = "IRQ normal",
92 [CTC_EVENT_FINSTAT] = "IRQ final",
93 [CTC_EVENT_TIMER] = "Timer",
94 [CTC_EVENT_START] = "Start",
95 [CTC_EVENT_STOP] = "Stop",
96 /*
97 * additional MPC events
98 */
99 [CTC_EVENT_SEND_XID] = "XID Exchange",
100 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
101};
102
103const char *ctc_ch_state_names[] = {
104 [CTC_STATE_IDLE] = "Idle",
105 [CTC_STATE_STOPPED] = "Stopped",
106 [CTC_STATE_STARTWAIT] = "StartWait",
107 [CTC_STATE_STARTRETRY] = "StartRetry",
108 [CTC_STATE_SETUPWAIT] = "SetupWait",
109 [CTC_STATE_RXINIT] = "RX init",
110 [CTC_STATE_TXINIT] = "TX init",
111 [CTC_STATE_RX] = "RX",
112 [CTC_STATE_TX] = "TX",
113 [CTC_STATE_RXIDLE] = "RX idle",
114 [CTC_STATE_TXIDLE] = "TX idle",
115 [CTC_STATE_RXERR] = "RX error",
116 [CTC_STATE_TXERR] = "TX error",
117 [CTC_STATE_TERM] = "Terminating",
118 [CTC_STATE_DTERM] = "Restarting",
119 [CTC_STATE_NOTOP] = "Not operational",
120 /*
121 * additional MPC states
122 */
123 [CH_XID0_PENDING] = "Pending XID0 Start",
124 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ",
125 [CH_XID7_PENDING] = "Pending XID7 P1 Start",
126 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ",
127 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ",
128 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ",
129 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ",
130};
131
132static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133
134/*
135 * ----- static ctcm actions for channel statemachine -----
136 *
137*/
138static void chx_txdone(fsm_instance *fi, int event, void *arg);
139static void chx_rx(fsm_instance *fi, int event, void *arg);
140static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141static void chx_firstio(fsm_instance *fi, int event, void *arg);
142static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156
157/*
158 * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159 *
160*/
161static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164/* shared :
165static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179*/
180static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
184
185/**
186 * Check return code of a preceding ccw_device call, halt_IO etc...
187 *
188 * ch : The channel, the error belongs to.
189 * Returns the error code (!= 0) to inspect.
190 */
191void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
192{
193 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
194 "%s(%s): %s: %04x\n",
195 CTCM_FUNTAIL, ch->id, msg, rc);
196 switch (rc) {
197 case -EBUSY:
198 pr_info("%s: The communication peer is busy\n",
199 ch->id);
200 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
201 break;
202 case -ENODEV:
203 pr_err("%s: The specified target device is not valid\n",
204 ch->id);
205 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
206 break;
207 default:
208 pr_err("An I/O operation resulted in error %04x\n",
209 rc);
210 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
211 }
212}
213
214void ctcm_purge_skb_queue(struct sk_buff_head *q)
215{
216 struct sk_buff *skb;
217
218 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
219
220 while ((skb = skb_dequeue(q))) {
221 refcount_dec(&skb->users);
222 dev_kfree_skb_any(skb);
223 }
224}
225
226/**
227 * NOP action for statemachines
228 */
229static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
230{
231}
232
233/*
234 * Actions for channel - statemachines.
235 */
236
237/**
238 * Normal data has been send. Free the corresponding
239 * skb (it's in io_queue), reset dev->tbusy and
240 * revert to idle state.
241 *
242 * fi An instance of a channel statemachine.
243 * event The event, just happened.
244 * arg Generic pointer, casted from channel * upon call.
245 */
246static void chx_txdone(fsm_instance *fi, int event, void *arg)
247{
248 struct channel *ch = arg;
249 struct net_device *dev = ch->netdev;
250 struct ctcm_priv *priv = dev->ml_priv;
251 struct sk_buff *skb;
252 int first = 1;
253 int i;
254 unsigned long duration;
255 unsigned long done_stamp = jiffies;
256
257 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
258
259 duration = done_stamp - ch->prof.send_stamp;
260 if (duration > ch->prof.tx_time)
261 ch->prof.tx_time = duration;
262
263 if (ch->irb->scsw.cmd.count != 0)
264 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
265 "%s(%s): TX not complete, remaining %d bytes",
266 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
267 fsm_deltimer(&ch->timer);
268 while ((skb = skb_dequeue(&ch->io_queue))) {
269 priv->stats.tx_packets++;
270 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
271 if (first) {
272 priv->stats.tx_bytes += 2;
273 first = 0;
274 }
275 refcount_dec(&skb->users);
276 dev_kfree_skb_irq(skb);
277 }
278 spin_lock(&ch->collect_lock);
279 clear_normalized_cda(&ch->ccw[4]);
280 if (ch->collect_len > 0) {
281 int rc;
282
283 if (ctcm_checkalloc_buffer(ch)) {
284 spin_unlock(&ch->collect_lock);
285 return;
286 }
287 ch->trans_skb->data = ch->trans_skb_data;
288 skb_reset_tail_pointer(ch->trans_skb);
289 ch->trans_skb->len = 0;
290 if (ch->prof.maxmulti < (ch->collect_len + 2))
291 ch->prof.maxmulti = ch->collect_len + 2;
292 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
293 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
294 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
295 i = 0;
296 while ((skb = skb_dequeue(&ch->collect_queue))) {
297 skb_copy_from_linear_data(skb,
298 skb_put(ch->trans_skb, skb->len), skb->len);
299 priv->stats.tx_packets++;
300 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
301 refcount_dec(&skb->users);
302 dev_kfree_skb_irq(skb);
303 i++;
304 }
305 ch->collect_len = 0;
306 spin_unlock(&ch->collect_lock);
307 ch->ccw[1].count = ch->trans_skb->len;
308 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
309 ch->prof.send_stamp = jiffies;
310 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
311 (unsigned long)ch, 0xff, 0);
312 ch->prof.doios_multi++;
313 if (rc != 0) {
314 priv->stats.tx_dropped += i;
315 priv->stats.tx_errors += i;
316 fsm_deltimer(&ch->timer);
317 ctcm_ccw_check_rc(ch, rc, "chained TX");
318 }
319 } else {
320 spin_unlock(&ch->collect_lock);
321 fsm_newstate(fi, CTC_STATE_TXIDLE);
322 }
323 ctcm_clear_busy_do(dev);
324}
325
326/**
327 * Initial data is sent.
328 * Notify device statemachine that we are up and
329 * running.
330 *
331 * fi An instance of a channel statemachine.
332 * event The event, just happened.
333 * arg Generic pointer, casted from channel * upon call.
334 */
335void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
336{
337 struct channel *ch = arg;
338 struct net_device *dev = ch->netdev;
339 struct ctcm_priv *priv = dev->ml_priv;
340
341 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
342
343 fsm_deltimer(&ch->timer);
344 fsm_newstate(fi, CTC_STATE_TXIDLE);
345 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
346}
347
348/**
349 * Got normal data, check for sanity, queue it up, allocate new buffer
350 * trigger bottom half, and initiate next read.
351 *
352 * fi An instance of a channel statemachine.
353 * event The event, just happened.
354 * arg Generic pointer, casted from channel * upon call.
355 */
356static void chx_rx(fsm_instance *fi, int event, void *arg)
357{
358 struct channel *ch = arg;
359 struct net_device *dev = ch->netdev;
360 struct ctcm_priv *priv = dev->ml_priv;
361 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
362 struct sk_buff *skb = ch->trans_skb;
363 __u16 block_len = *((__u16 *)skb->data);
364 int check_len;
365 int rc;
366
367 fsm_deltimer(&ch->timer);
368 if (len < 8) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
370 "%s(%s): got packet with length %d < 8\n",
371 CTCM_FUNTAIL, dev->name, len);
372 priv->stats.rx_dropped++;
373 priv->stats.rx_length_errors++;
374 goto again;
375 }
376 if (len > ch->max_bufsize) {
377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
378 "%s(%s): got packet with length %d > %d\n",
379 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
380 priv->stats.rx_dropped++;
381 priv->stats.rx_length_errors++;
382 goto again;
383 }
384
385 /*
386 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
387 */
388 switch (ch->protocol) {
389 case CTCM_PROTO_S390:
390 case CTCM_PROTO_OS390:
391 check_len = block_len + 2;
392 break;
393 default:
394 check_len = block_len;
395 break;
396 }
397 if ((len < block_len) || (len > check_len)) {
398 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
399 "%s(%s): got block length %d != rx length %d\n",
400 CTCM_FUNTAIL, dev->name, block_len, len);
401 if (do_debug)
402 ctcmpc_dump_skb(skb, 0);
403
404 *((__u16 *)skb->data) = len;
405 priv->stats.rx_dropped++;
406 priv->stats.rx_length_errors++;
407 goto again;
408 }
409 if (block_len > 2) {
410 *((__u16 *)skb->data) = block_len - 2;
411 ctcm_unpack_skb(ch, skb);
412 }
413 again:
414 skb->data = ch->trans_skb_data;
415 skb_reset_tail_pointer(skb);
416 skb->len = 0;
417 if (ctcm_checkalloc_buffer(ch))
418 return;
419 ch->ccw[1].count = ch->max_bufsize;
420 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
421 (unsigned long)ch, 0xff, 0);
422 if (rc != 0)
423 ctcm_ccw_check_rc(ch, rc, "normal RX");
424}
425
426/**
427 * Initialize connection by sending a __u16 of value 0.
428 *
429 * fi An instance of a channel statemachine.
430 * event The event, just happened.
431 * arg Generic pointer, casted from channel * upon call.
432 */
433static void chx_firstio(fsm_instance *fi, int event, void *arg)
434{
435 int rc;
436 struct channel *ch = arg;
437 int fsmstate = fsm_getstate(fi);
438
439 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
440 "%s(%s) : %02x",
441 CTCM_FUNTAIL, ch->id, fsmstate);
442
443 ch->sense_rc = 0; /* reset unit check report control */
444 if (fsmstate == CTC_STATE_TXIDLE)
445 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
446 "%s(%s): remote side issued READ?, init.\n",
447 CTCM_FUNTAIL, ch->id);
448 fsm_deltimer(&ch->timer);
449 if (ctcm_checkalloc_buffer(ch))
450 return;
451 if ((fsmstate == CTC_STATE_SETUPWAIT) &&
452 (ch->protocol == CTCM_PROTO_OS390)) {
453 /* OS/390 resp. z/OS */
454 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
455 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
456 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
457 CTC_EVENT_TIMER, ch);
458 chx_rxidle(fi, event, arg);
459 } else {
460 struct net_device *dev = ch->netdev;
461 struct ctcm_priv *priv = dev->ml_priv;
462 fsm_newstate(fi, CTC_STATE_TXIDLE);
463 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
464 }
465 return;
466 }
467 /*
468 * Don't setup a timer for receiving the initial RX frame
469 * if in compatibility mode, since VM TCP delays the initial
470 * frame until it has some data to send.
471 */
472 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
473 (ch->protocol != CTCM_PROTO_S390))
474 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
475
476 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
477 ch->ccw[1].count = 2; /* Transfer only length */
478
479 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
480 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
481 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
482 (unsigned long)ch, 0xff, 0);
483 if (rc != 0) {
484 fsm_deltimer(&ch->timer);
485 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
486 ctcm_ccw_check_rc(ch, rc, "init IO");
487 }
488 /*
489 * If in compatibility mode since we don't setup a timer, we
490 * also signal RX channel up immediately. This enables us
491 * to send packets early which in turn usually triggers some
492 * reply from VM TCP which brings up the RX channel to it's
493 * final state.
494 */
495 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
496 (ch->protocol == CTCM_PROTO_S390)) {
497 struct net_device *dev = ch->netdev;
498 struct ctcm_priv *priv = dev->ml_priv;
499 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
500 }
501}
502
503/**
504 * Got initial data, check it. If OK,
505 * notify device statemachine that we are up and
506 * running.
507 *
508 * fi An instance of a channel statemachine.
509 * event The event, just happened.
510 * arg Generic pointer, casted from channel * upon call.
511 */
512static void chx_rxidle(fsm_instance *fi, int event, void *arg)
513{
514 struct channel *ch = arg;
515 struct net_device *dev = ch->netdev;
516 struct ctcm_priv *priv = dev->ml_priv;
517 __u16 buflen;
518 int rc;
519
520 fsm_deltimer(&ch->timer);
521 buflen = *((__u16 *)ch->trans_skb->data);
522 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
523 __func__, dev->name, buflen);
524
525 if (buflen >= CTCM_INITIAL_BLOCKLEN) {
526 if (ctcm_checkalloc_buffer(ch))
527 return;
528 ch->ccw[1].count = ch->max_bufsize;
529 fsm_newstate(fi, CTC_STATE_RXIDLE);
530 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
531 (unsigned long)ch, 0xff, 0);
532 if (rc != 0) {
533 fsm_newstate(fi, CTC_STATE_RXINIT);
534 ctcm_ccw_check_rc(ch, rc, "initial RX");
535 } else
536 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
537 } else {
538 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
539 __func__, dev->name,
540 buflen, CTCM_INITIAL_BLOCKLEN);
541 chx_firstio(fi, event, arg);
542 }
543}
544
545/**
546 * Set channel into extended mode.
547 *
548 * fi An instance of a channel statemachine.
549 * event The event, just happened.
550 * arg Generic pointer, casted from channel * upon call.
551 */
552static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
553{
554 struct channel *ch = arg;
555 int rc;
556 unsigned long saveflags = 0;
557 int timeout = CTCM_TIME_5_SEC;
558
559 fsm_deltimer(&ch->timer);
560 if (IS_MPC(ch)) {
561 timeout = 1500;
562 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
563 __func__, smp_processor_id(), ch, ch->id);
564 }
565 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
566 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
567 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
568
569 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
571 /* Such conditional locking is undeterministic in
572 * static view. => ignore sparse warnings here. */
573
574 rc = ccw_device_start(ch->cdev, &ch->ccw[6],
575 (unsigned long)ch, 0xff, 0);
576 if (event == CTC_EVENT_TIMER) /* see above comments */
577 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
578 if (rc != 0) {
579 fsm_deltimer(&ch->timer);
580 fsm_newstate(fi, CTC_STATE_STARTWAIT);
581 ctcm_ccw_check_rc(ch, rc, "set Mode");
582 } else
583 ch->retry = 0;
584}
585
586/**
587 * Setup channel.
588 *
589 * fi An instance of a channel statemachine.
590 * event The event, just happened.
591 * arg Generic pointer, casted from channel * upon call.
592 */
593static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
594{
595 struct channel *ch = arg;
596 unsigned long saveflags;
597 int rc;
598
599 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
600 CTCM_FUNTAIL, ch->id,
601 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
602
603 if (ch->trans_skb != NULL) {
604 clear_normalized_cda(&ch->ccw[1]);
605 dev_kfree_skb(ch->trans_skb);
606 ch->trans_skb = NULL;
607 }
608 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
609 ch->ccw[1].cmd_code = CCW_CMD_READ;
610 ch->ccw[1].flags = CCW_FLAG_SLI;
611 ch->ccw[1].count = 0;
612 } else {
613 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
614 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
615 ch->ccw[1].count = 0;
616 }
617 if (ctcm_checkalloc_buffer(ch)) {
618 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
619 "%s(%s): %s trans_skb alloc delayed "
620 "until first transfer",
621 CTCM_FUNTAIL, ch->id,
622 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
623 "RX" : "TX");
624 }
625 ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
626 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
627 ch->ccw[0].count = 0;
628 ch->ccw[0].cda = 0;
629 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */
630 ch->ccw[2].flags = CCW_FLAG_SLI;
631 ch->ccw[2].count = 0;
632 ch->ccw[2].cda = 0;
633 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
634 ch->ccw[4].cda = 0;
635 ch->ccw[4].flags &= ~CCW_FLAG_IDA;
636
637 fsm_newstate(fi, CTC_STATE_STARTWAIT);
638 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
639 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
640 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
641 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
642 if (rc != 0) {
643 if (rc != -EBUSY)
644 fsm_deltimer(&ch->timer);
645 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
646 }
647}
648
649/**
650 * Shutdown a channel.
651 *
652 * fi An instance of a channel statemachine.
653 * event The event, just happened.
654 * arg Generic pointer, casted from channel * upon call.
655 */
656static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
657{
658 struct channel *ch = arg;
659 unsigned long saveflags = 0;
660 int rc;
661 int oldstate;
662
663 fsm_deltimer(&ch->timer);
664 if (IS_MPC(ch))
665 fsm_deltimer(&ch->sweep_timer);
666
667 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
668
669 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */
670 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
671 /* Such conditional locking is undeterministic in
672 * static view. => ignore sparse warnings here. */
673 oldstate = fsm_getstate(fi);
674 fsm_newstate(fi, CTC_STATE_TERM);
675 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
676
677 if (event == CTC_EVENT_STOP)
678 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
679 /* see remark above about conditional locking */
680
681 if (rc != 0 && rc != -EBUSY) {
682 fsm_deltimer(&ch->timer);
683 if (event != CTC_EVENT_STOP) {
684 fsm_newstate(fi, oldstate);
685 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
686 }
687 }
688}
689
690/**
691 * Cleanup helper for chx_fail and chx_stopped
692 * cleanup channels queue and notify interface statemachine.
693 *
694 * fi An instance of a channel statemachine.
695 * state The next state (depending on caller).
696 * ch The channel to operate on.
697 */
698static void ctcm_chx_cleanup(fsm_instance *fi, int state,
699 struct channel *ch)
700{
701 struct net_device *dev = ch->netdev;
702 struct ctcm_priv *priv = dev->ml_priv;
703
704 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
705 "%s(%s): %s[%d]\n",
706 CTCM_FUNTAIL, dev->name, ch->id, state);
707
708 fsm_deltimer(&ch->timer);
709 if (IS_MPC(ch))
710 fsm_deltimer(&ch->sweep_timer);
711
712 fsm_newstate(fi, state);
713 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
714 clear_normalized_cda(&ch->ccw[1]);
715 dev_kfree_skb_any(ch->trans_skb);
716 ch->trans_skb = NULL;
717 }
718
719 ch->th_seg = 0x00;
720 ch->th_seq_num = 0x00;
721 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
722 skb_queue_purge(&ch->io_queue);
723 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
724 } else {
725 ctcm_purge_skb_queue(&ch->io_queue);
726 if (IS_MPC(ch))
727 ctcm_purge_skb_queue(&ch->sweep_queue);
728 spin_lock(&ch->collect_lock);
729 ctcm_purge_skb_queue(&ch->collect_queue);
730 ch->collect_len = 0;
731 spin_unlock(&ch->collect_lock);
732 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
733 }
734}
735
736/**
737 * A channel has successfully been halted.
738 * Cleanup it's queue and notify interface statemachine.
739 *
740 * fi An instance of a channel statemachine.
741 * event The event, just happened.
742 * arg Generic pointer, casted from channel * upon call.
743 */
744static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
745{
746 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
747}
748
749/**
750 * A stop command from device statemachine arrived and we are in
751 * not operational mode. Set state to stopped.
752 *
753 * fi An instance of a channel statemachine.
754 * event The event, just happened.
755 * arg Generic pointer, casted from channel * upon call.
756 */
757static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
758{
759 fsm_newstate(fi, CTC_STATE_STOPPED);
760}
761
762/**
763 * A machine check for no path, not operational status or gone device has
764 * happened.
765 * Cleanup queue and notify interface statemachine.
766 *
767 * fi An instance of a channel statemachine.
768 * event The event, just happened.
769 * arg Generic pointer, casted from channel * upon call.
770 */
771static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
772{
773 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
774}
775
776/**
777 * Handle error during setup of channel.
778 *
779 * fi An instance of a channel statemachine.
780 * event The event, just happened.
781 * arg Generic pointer, casted from channel * upon call.
782 */
783static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
784{
785 struct channel *ch = arg;
786 struct net_device *dev = ch->netdev;
787 struct ctcm_priv *priv = dev->ml_priv;
788
789 /*
790 * Special case: Got UC_RCRESET on setmode.
791 * This means that remote side isn't setup. In this case
792 * simply retry after some 10 secs...
793 */
794 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
795 ((event == CTC_EVENT_UC_RCRESET) ||
796 (event == CTC_EVENT_UC_RSRESET))) {
797 fsm_newstate(fi, CTC_STATE_STARTRETRY);
798 fsm_deltimer(&ch->timer);
799 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
800 if (!IS_MPC(ch) &&
801 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
802 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
803 if (rc != 0)
804 ctcm_ccw_check_rc(ch, rc,
805 "HaltIO in chx_setuperr");
806 }
807 return;
808 }
809
810 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
811 "%s(%s) : %s error during %s channel setup state=%s\n",
812 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
813 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
814 fsm_getstate_str(fi));
815
816 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
817 fsm_newstate(fi, CTC_STATE_RXERR);
818 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
819 } else {
820 fsm_newstate(fi, CTC_STATE_TXERR);
821 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
822 }
823}
824
825/**
826 * Restart a channel after an error.
827 *
828 * fi An instance of a channel statemachine.
829 * event The event, just happened.
830 * arg Generic pointer, casted from channel * upon call.
831 */
832static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
833{
834 struct channel *ch = arg;
835 struct net_device *dev = ch->netdev;
836 unsigned long saveflags = 0;
837 int oldstate;
838 int rc;
839
840 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
841 "%s: %s[%d] of %s\n",
842 CTCM_FUNTAIL, ch->id, event, dev->name);
843
844 fsm_deltimer(&ch->timer);
845
846 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
847 oldstate = fsm_getstate(fi);
848 fsm_newstate(fi, CTC_STATE_STARTWAIT);
849 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */
850 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
851 /* Such conditional locking is a known problem for
852 * sparse because its undeterministic in static view.
853 * Warnings should be ignored here. */
854 rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
855 if (event == CTC_EVENT_TIMER)
856 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
857 if (rc != 0) {
858 if (rc != -EBUSY) {
859 fsm_deltimer(&ch->timer);
860 fsm_newstate(fi, oldstate);
861 }
862 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
863 }
864}
865
866/**
867 * Handle error during RX initial handshake (exchange of
868 * 0-length block header)
869 *
870 * fi An instance of a channel statemachine.
871 * event The event, just happened.
872 * arg Generic pointer, casted from channel * upon call.
873 */
874static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
875{
876 struct channel *ch = arg;
877 struct net_device *dev = ch->netdev;
878 struct ctcm_priv *priv = dev->ml_priv;
879
880 if (event == CTC_EVENT_TIMER) {
881 if (!IS_MPCDEV(dev))
882 /* TODO : check if MPC deletes timer somewhere */
883 fsm_deltimer(&ch->timer);
884 if (ch->retry++ < 3)
885 ctcm_chx_restart(fi, event, arg);
886 else {
887 fsm_newstate(fi, CTC_STATE_RXERR);
888 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
889 }
890 } else {
891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
892 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
893 ctc_ch_event_names[event], fsm_getstate_str(fi));
894
895 dev_warn(&dev->dev,
896 "Initialization failed with RX/TX init handshake "
897 "error %s\n", ctc_ch_event_names[event]);
898 }
899}
900
901/**
902 * Notify device statemachine if we gave up initialization
903 * of RX channel.
904 *
905 * fi An instance of a channel statemachine.
906 * event The event, just happened.
907 * arg Generic pointer, casted from channel * upon call.
908 */
909static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
910{
911 struct channel *ch = arg;
912 struct net_device *dev = ch->netdev;
913 struct ctcm_priv *priv = dev->ml_priv;
914
915 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
916 "%s(%s): RX %s busy, init. fail",
917 CTCM_FUNTAIL, dev->name, ch->id);
918 fsm_newstate(fi, CTC_STATE_RXERR);
919 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
920}
921
922/**
923 * Handle RX Unit check remote reset (remote disconnected)
924 *
925 * fi An instance of a channel statemachine.
926 * event The event, just happened.
927 * arg Generic pointer, casted from channel * upon call.
928 */
929static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
930{
931 struct channel *ch = arg;
932 struct channel *ch2;
933 struct net_device *dev = ch->netdev;
934 struct ctcm_priv *priv = dev->ml_priv;
935
936 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
937 "%s: %s: remote disconnect - re-init ...",
938 CTCM_FUNTAIL, dev->name);
939 fsm_deltimer(&ch->timer);
940 /*
941 * Notify device statemachine
942 */
943 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
944 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
945
946 fsm_newstate(fi, CTC_STATE_DTERM);
947 ch2 = priv->channel[CTCM_WRITE];
948 fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
949
950 ccw_device_halt(ch->cdev, (unsigned long)ch);
951 ccw_device_halt(ch2->cdev, (unsigned long)ch2);
952}
953
954/**
955 * Handle error during TX channel initialization.
956 *
957 * fi An instance of a channel statemachine.
958 * event The event, just happened.
959 * arg Generic pointer, casted from channel * upon call.
960 */
961static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
962{
963 struct channel *ch = arg;
964 struct net_device *dev = ch->netdev;
965 struct ctcm_priv *priv = dev->ml_priv;
966
967 if (event == CTC_EVENT_TIMER) {
968 fsm_deltimer(&ch->timer);
969 if (ch->retry++ < 3)
970 ctcm_chx_restart(fi, event, arg);
971 else {
972 fsm_newstate(fi, CTC_STATE_TXERR);
973 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
974 }
975 } else {
976 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
977 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
978 ctc_ch_event_names[event], fsm_getstate_str(fi));
979
980 dev_warn(&dev->dev,
981 "Initialization failed with RX/TX init handshake "
982 "error %s\n", ctc_ch_event_names[event]);
983 }
984}
985
986/**
987 * Handle TX timeout by retrying operation.
988 *
989 * fi An instance of a channel statemachine.
990 * event The event, just happened.
991 * arg Generic pointer, casted from channel * upon call.
992 */
993static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
994{
995 struct channel *ch = arg;
996 struct net_device *dev = ch->netdev;
997 struct ctcm_priv *priv = dev->ml_priv;
998 struct sk_buff *skb;
999
1000 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1001 __func__, smp_processor_id(), ch, ch->id);
1002
1003 fsm_deltimer(&ch->timer);
1004 if (ch->retry++ > 3) {
1005 struct mpc_group *gptr = priv->mpcg;
1006 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1007 "%s: %s: retries exceeded",
1008 CTCM_FUNTAIL, ch->id);
1009 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1010 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1011 use gptr as mpc indicator */
1012 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1013 ctcm_chx_restart(fi, event, arg);
1014 goto done;
1015 }
1016
1017 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1018 "%s : %s: retry %d",
1019 CTCM_FUNTAIL, ch->id, ch->retry);
1020 skb = skb_peek(&ch->io_queue);
1021 if (skb) {
1022 int rc = 0;
1023 unsigned long saveflags = 0;
1024 clear_normalized_cda(&ch->ccw[4]);
1025 ch->ccw[4].count = skb->len;
1026 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1027 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1028 "%s: %s: IDAL alloc failed",
1029 CTCM_FUNTAIL, ch->id);
1030 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1031 ctcm_chx_restart(fi, event, arg);
1032 goto done;
1033 }
1034 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1035 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1036 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1037 /* Such conditional locking is a known problem for
1038 * sparse because its undeterministic in static view.
1039 * Warnings should be ignored here. */
1040 if (do_debug_ccw)
1041 ctcmpc_dumpit((char *)&ch->ccw[3],
1042 sizeof(struct ccw1) * 3);
1043
1044 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1045 (unsigned long)ch, 0xff, 0);
1046 if (event == CTC_EVENT_TIMER)
1047 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1048 saveflags);
1049 if (rc != 0) {
1050 fsm_deltimer(&ch->timer);
1051 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1052 ctcm_purge_skb_queue(&ch->io_queue);
1053 }
1054 }
1055done:
1056 return;
1057}
1058
1059/**
1060 * Handle fatal errors during an I/O command.
1061 *
1062 * fi An instance of a channel statemachine.
1063 * event The event, just happened.
1064 * arg Generic pointer, casted from channel * upon call.
1065 */
1066static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1067{
1068 struct channel *ch = arg;
1069 struct net_device *dev = ch->netdev;
1070 struct ctcm_priv *priv = dev->ml_priv;
1071 int rd = CHANNEL_DIRECTION(ch->flags);
1072
1073 fsm_deltimer(&ch->timer);
1074 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1075 "%s: %s: %s unrecoverable channel error",
1076 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1077
1078 if (IS_MPC(ch)) {
1079 priv->stats.tx_dropped++;
1080 priv->stats.tx_errors++;
1081 }
1082 if (rd == CTCM_READ) {
1083 fsm_newstate(fi, CTC_STATE_RXERR);
1084 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1085 } else {
1086 fsm_newstate(fi, CTC_STATE_TXERR);
1087 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1088 }
1089}
1090
1091/*
1092 * The ctcm statemachine for a channel.
1093 */
1094const fsm_node ch_fsm[] = {
1095 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1096 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1097 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1098 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1099
1100 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1101 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1102 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1103 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1104 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1105
1106 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1107 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1108 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1109 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1110 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1111 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1112
1113 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1114 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1115 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop },
1116 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1117
1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio },
1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1126
1127 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1128 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1129 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle },
1130 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1131 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1132 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1133 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1134 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1135 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio },
1136 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1137
1138 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1139 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1140 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx },
1141 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1142 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1143 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1144 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx },
1145
1146 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1147 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
1148 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
1149 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
1150 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
1151 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
1152 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1153 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1154
1155 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1156 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
1157 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio },
1158 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1159 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1160 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1161 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1162
1163 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
1164 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
1165 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
1166 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1167 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1168 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1169
1170 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
1171 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
1172 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1173 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
1174 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
1175 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1176
1177 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
1178 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
1179 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone },
1180 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry },
1181 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry },
1182 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
1183 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1184 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1185
1186 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1187 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
1188 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1189 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1190};
1191
1192int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1193
1194/*
1195 * MPC actions for mpc channel statemachine
1196 * handling of MPC protocol requires extra
1197 * statemachine and actions which are prefixed ctcmpc_ .
1198 * The ctc_ch_states and ctc_ch_state_names,
1199 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1200 * which are expanded by some elements.
1201 */
1202
1203/*
1204 * Actions for mpc channel statemachine.
1205 */
1206
1207/**
1208 * Normal data has been send. Free the corresponding
1209 * skb (it's in io_queue), reset dev->tbusy and
1210 * revert to idle state.
1211 *
1212 * fi An instance of a channel statemachine.
1213 * event The event, just happened.
1214 * arg Generic pointer, casted from channel * upon call.
1215 */
1216static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1217{
1218 struct channel *ch = arg;
1219 struct net_device *dev = ch->netdev;
1220 struct ctcm_priv *priv = dev->ml_priv;
1221 struct mpc_group *grp = priv->mpcg;
1222 struct sk_buff *skb;
1223 int first = 1;
1224 int i;
1225 __u32 data_space;
1226 unsigned long duration;
1227 struct sk_buff *peekskb;
1228 int rc;
1229 struct th_header *header;
1230 struct pdu *p_header;
1231 unsigned long done_stamp = jiffies;
1232
1233 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1234 __func__, dev->name, smp_processor_id());
1235
1236 duration = done_stamp - ch->prof.send_stamp;
1237 if (duration > ch->prof.tx_time)
1238 ch->prof.tx_time = duration;
1239
1240 if (ch->irb->scsw.cmd.count != 0)
1241 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1242 "%s(%s): TX not complete, remaining %d bytes",
1243 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1244 fsm_deltimer(&ch->timer);
1245 while ((skb = skb_dequeue(&ch->io_queue))) {
1246 priv->stats.tx_packets++;
1247 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1248 if (first) {
1249 priv->stats.tx_bytes += 2;
1250 first = 0;
1251 }
1252 refcount_dec(&skb->users);
1253 dev_kfree_skb_irq(skb);
1254 }
1255 spin_lock(&ch->collect_lock);
1256 clear_normalized_cda(&ch->ccw[4]);
1257 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1258 spin_unlock(&ch->collect_lock);
1259 fsm_newstate(fi, CTC_STATE_TXIDLE);
1260 goto done;
1261 }
1262
1263 if (ctcm_checkalloc_buffer(ch)) {
1264 spin_unlock(&ch->collect_lock);
1265 goto done;
1266 }
1267 ch->trans_skb->data = ch->trans_skb_data;
1268 skb_reset_tail_pointer(ch->trans_skb);
1269 ch->trans_skb->len = 0;
1270 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1271 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1272 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1273 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1274 i = 0;
1275 p_header = NULL;
1276 data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1277
1278 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1279 " data_space:%04x\n",
1280 __func__, data_space);
1281
1282 while ((skb = skb_dequeue(&ch->collect_queue))) {
1283 skb_put_data(ch->trans_skb, skb->data, skb->len);
1284 p_header = (struct pdu *)
1285 (skb_tail_pointer(ch->trans_skb) - skb->len);
1286 p_header->pdu_flag = 0x00;
1287 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
1288 p_header->pdu_flag |= 0x60;
1289 else
1290 p_header->pdu_flag |= 0x20;
1291
1292 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1293 __func__, ch->trans_skb->len);
1294 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1295 " to 32 bytes sent to vtam\n", __func__);
1296 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1297
1298 ch->collect_len -= skb->len;
1299 data_space -= skb->len;
1300 priv->stats.tx_packets++;
1301 priv->stats.tx_bytes += skb->len;
1302 refcount_dec(&skb->users);
1303 dev_kfree_skb_any(skb);
1304 peekskb = skb_peek(&ch->collect_queue);
1305 if (peekskb->len > data_space)
1306 break;
1307 i++;
1308 }
1309 /* p_header points to the last one we handled */
1310 if (p_header)
1311 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1312 header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1313 if (!header) {
1314 spin_unlock(&ch->collect_lock);
1315 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1316 goto done;
1317 }
1318 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
1319 ch->th_seq_num++;
1320 header->th_seq_num = ch->th_seq_num;
1321
1322 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1323 __func__, ch->th_seq_num);
1324
1325 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1326 TH_HEADER_LENGTH); /* put the TH on the packet */
1327
1328 kfree(header);
1329
1330 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1331 __func__, ch->trans_skb->len);
1332 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1333 "data to vtam from collect_q\n", __func__);
1334 CTCM_D3_DUMP((char *)ch->trans_skb->data,
1335 min_t(int, ch->trans_skb->len, 50));
1336
1337 spin_unlock(&ch->collect_lock);
1338 clear_normalized_cda(&ch->ccw[1]);
1339
1340 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1341 (void *)(unsigned long)ch->ccw[1].cda,
1342 ch->trans_skb->data);
1343 ch->ccw[1].count = ch->max_bufsize;
1344
1345 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1346 dev_kfree_skb_any(ch->trans_skb);
1347 ch->trans_skb = NULL;
1348 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1349 "%s: %s: IDAL alloc failed",
1350 CTCM_FUNTAIL, ch->id);
1351 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1352 return;
1353 }
1354
1355 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1356 (void *)(unsigned long)ch->ccw[1].cda,
1357 ch->trans_skb->data);
1358
1359 ch->ccw[1].count = ch->trans_skb->len;
1360 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1361 ch->prof.send_stamp = jiffies;
1362 if (do_debug_ccw)
1363 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1364 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1365 (unsigned long)ch, 0xff, 0);
1366 ch->prof.doios_multi++;
1367 if (rc != 0) {
1368 priv->stats.tx_dropped += i;
1369 priv->stats.tx_errors += i;
1370 fsm_deltimer(&ch->timer);
1371 ctcm_ccw_check_rc(ch, rc, "chained TX");
1372 }
1373done:
1374 ctcm_clear_busy(dev);
1375 return;
1376}
1377
1378/**
1379 * Got normal data, check for sanity, queue it up, allocate new buffer
1380 * trigger bottom half, and initiate next read.
1381 *
1382 * fi An instance of a channel statemachine.
1383 * event The event, just happened.
1384 * arg Generic pointer, casted from channel * upon call.
1385 */
1386static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1387{
1388 struct channel *ch = arg;
1389 struct net_device *dev = ch->netdev;
1390 struct ctcm_priv *priv = dev->ml_priv;
1391 struct mpc_group *grp = priv->mpcg;
1392 struct sk_buff *skb = ch->trans_skb;
1393 struct sk_buff *new_skb;
1394 unsigned long saveflags = 0; /* avoids compiler warning */
1395 int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1396
1397 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1398 CTCM_FUNTAIL, dev->name, smp_processor_id(),
1399 ch->id, ch->max_bufsize, len);
1400 fsm_deltimer(&ch->timer);
1401
1402 if (skb == NULL) {
1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1404 "%s(%s): TRANS_SKB = NULL",
1405 CTCM_FUNTAIL, dev->name);
1406 goto again;
1407 }
1408
1409 if (len < TH_HEADER_LENGTH) {
1410 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1411 "%s(%s): packet length %d to short",
1412 CTCM_FUNTAIL, dev->name, len);
1413 priv->stats.rx_dropped++;
1414 priv->stats.rx_length_errors++;
1415 } else {
1416 /* must have valid th header or game over */
1417 __u32 block_len = len;
1418 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1419 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1420
1421 if (new_skb == NULL) {
1422 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1423 "%s(%d): skb allocation failed",
1424 CTCM_FUNTAIL, dev->name);
1425 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1426 goto again;
1427 }
1428 switch (fsm_getstate(grp->fsm)) {
1429 case MPCG_STATE_RESET:
1430 case MPCG_STATE_INOP:
1431 dev_kfree_skb_any(new_skb);
1432 break;
1433 case MPCG_STATE_FLOWC:
1434 case MPCG_STATE_READY:
1435 skb_put_data(new_skb, skb->data, block_len);
1436 skb_queue_tail(&ch->io_queue, new_skb);
1437 tasklet_schedule(&ch->ch_tasklet);
1438 break;
1439 default:
1440 skb_put_data(new_skb, skb->data, len);
1441 skb_queue_tail(&ch->io_queue, new_skb);
1442 tasklet_hi_schedule(&ch->ch_tasklet);
1443 break;
1444 }
1445 }
1446
1447again:
1448 switch (fsm_getstate(grp->fsm)) {
1449 int rc, dolock;
1450 case MPCG_STATE_FLOWC:
1451 case MPCG_STATE_READY:
1452 if (ctcm_checkalloc_buffer(ch))
1453 break;
1454 ch->trans_skb->data = ch->trans_skb_data;
1455 skb_reset_tail_pointer(ch->trans_skb);
1456 ch->trans_skb->len = 0;
1457 ch->ccw[1].count = ch->max_bufsize;
1458 if (do_debug_ccw)
1459 ctcmpc_dumpit((char *)&ch->ccw[0],
1460 sizeof(struct ccw1) * 3);
1461 dolock = !in_irq();
1462 if (dolock)
1463 spin_lock_irqsave(
1464 get_ccwdev_lock(ch->cdev), saveflags);
1465 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1466 (unsigned long)ch, 0xff, 0);
1467 if (dolock) /* see remark about conditional locking */
1468 spin_unlock_irqrestore(
1469 get_ccwdev_lock(ch->cdev), saveflags);
1470 if (rc != 0)
1471 ctcm_ccw_check_rc(ch, rc, "normal RX");
1472 default:
1473 break;
1474 }
1475
1476 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1477 __func__, dev->name, ch, ch->id);
1478
1479}
1480
1481/**
1482 * Initialize connection by sending a __u16 of value 0.
1483 *
1484 * fi An instance of a channel statemachine.
1485 * event The event, just happened.
1486 * arg Generic pointer, casted from channel * upon call.
1487 */
1488static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1489{
1490 struct channel *ch = arg;
1491 struct net_device *dev = ch->netdev;
1492 struct ctcm_priv *priv = dev->ml_priv;
1493 struct mpc_group *gptr = priv->mpcg;
1494
1495 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1496 __func__, ch->id, ch);
1497
1498 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1499 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1500 CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1501 fsm_getstate(gptr->fsm), ch->protocol);
1502
1503 if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1504 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1505
1506 fsm_deltimer(&ch->timer);
1507 if (ctcm_checkalloc_buffer(ch))
1508 goto done;
1509
1510 switch (fsm_getstate(fi)) {
1511 case CTC_STATE_STARTRETRY:
1512 case CTC_STATE_SETUPWAIT:
1513 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1514 ctcmpc_chx_rxidle(fi, event, arg);
1515 } else {
1516 fsm_newstate(fi, CTC_STATE_TXIDLE);
1517 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1518 }
1519 goto done;
1520 default:
1521 break;
1522 }
1523
1524 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1525 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1526
1527done:
1528 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1529 __func__, ch->id, ch);
1530 return;
1531}
1532
1533/**
1534 * Got initial data, check it. If OK,
1535 * notify device statemachine that we are up and
1536 * running.
1537 *
1538 * fi An instance of a channel statemachine.
1539 * event The event, just happened.
1540 * arg Generic pointer, casted from channel * upon call.
1541 */
1542void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1543{
1544 struct channel *ch = arg;
1545 struct net_device *dev = ch->netdev;
1546 struct ctcm_priv *priv = dev->ml_priv;
1547 struct mpc_group *grp = priv->mpcg;
1548 int rc;
1549 unsigned long saveflags = 0; /* avoids compiler warning */
1550
1551 fsm_deltimer(&ch->timer);
1552 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1553 __func__, ch->id, dev->name, smp_processor_id(),
1554 fsm_getstate(fi), fsm_getstate(grp->fsm));
1555
1556 fsm_newstate(fi, CTC_STATE_RXIDLE);
1557 /* XID processing complete */
1558
1559 switch (fsm_getstate(grp->fsm)) {
1560 case MPCG_STATE_FLOWC:
1561 case MPCG_STATE_READY:
1562 if (ctcm_checkalloc_buffer(ch))
1563 goto done;
1564 ch->trans_skb->data = ch->trans_skb_data;
1565 skb_reset_tail_pointer(ch->trans_skb);
1566 ch->trans_skb->len = 0;
1567 ch->ccw[1].count = ch->max_bufsize;
1568 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1569 if (event == CTC_EVENT_START)
1570 /* see remark about conditional locking */
1571 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1572 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1573 (unsigned long)ch, 0xff, 0);
1574 if (event == CTC_EVENT_START)
1575 spin_unlock_irqrestore(
1576 get_ccwdev_lock(ch->cdev), saveflags);
1577 if (rc != 0) {
1578 fsm_newstate(fi, CTC_STATE_RXINIT);
1579 ctcm_ccw_check_rc(ch, rc, "initial RX");
1580 goto done;
1581 }
1582 break;
1583 default:
1584 break;
1585 }
1586
1587 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1588done:
1589 return;
1590}
1591
1592/*
1593 * ctcmpc channel FSM action
1594 * called from several points in ctcmpc_ch_fsm
1595 * ctcmpc only
1596 */
1597static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1598{
1599 struct channel *ch = arg;
1600 struct net_device *dev = ch->netdev;
1601 struct ctcm_priv *priv = dev->ml_priv;
1602 struct mpc_group *grp = priv->mpcg;
1603
1604 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1605 __func__, dev->name, ch->id, ch, smp_processor_id(),
1606 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1607
1608 switch (fsm_getstate(grp->fsm)) {
1609 case MPCG_STATE_XID2INITW:
1610 /* ok..start yside xid exchanges */
1611 if (!ch->in_mpcgroup)
1612 break;
1613 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) {
1614 fsm_deltimer(&grp->timer);
1615 fsm_addtimer(&grp->timer,
1616 MPC_XID_TIMEOUT_VALUE,
1617 MPCG_EVENT_TIMER, dev);
1618 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1619
1620 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1621 /* attn rcvd before xid0 processed via bh */
1622 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1623 break;
1624 case MPCG_STATE_XID2INITX:
1625 case MPCG_STATE_XID0IOWAIT:
1626 case MPCG_STATE_XID0IOWAIX:
1627 /* attn rcvd before xid0 processed on ch
1628 but mid-xid0 processing for group */
1629 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1630 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1631 break;
1632 case MPCG_STATE_XID7INITW:
1633 case MPCG_STATE_XID7INITX:
1634 case MPCG_STATE_XID7INITI:
1635 case MPCG_STATE_XID7INITZ:
1636 switch (fsm_getstate(ch->fsm)) {
1637 case CH_XID7_PENDING:
1638 fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1639 break;
1640 case CH_XID7_PENDING2:
1641 fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1642 break;
1643 }
1644 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1645 break;
1646 }
1647
1648 return;
1649}
1650
1651/*
1652 * ctcmpc channel FSM action
1653 * called from one point in ctcmpc_ch_fsm
1654 * ctcmpc only
1655 */
1656static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1657{
1658 struct channel *ch = arg;
1659 struct net_device *dev = ch->netdev;
1660 struct ctcm_priv *priv = dev->ml_priv;
1661 struct mpc_group *grp = priv->mpcg;
1662
1663 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n",
1664 __func__, dev->name, ch->id,
1665 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1666
1667 fsm_deltimer(&ch->timer);
1668
1669 switch (fsm_getstate(grp->fsm)) {
1670 case MPCG_STATE_XID0IOWAIT:
1671 /* vtam wants to be primary.start yside xid exchanges*/
1672 /* only receive one attn-busy at a time so must not */
1673 /* change state each time */
1674 grp->changed_side = 1;
1675 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1676 break;
1677 case MPCG_STATE_XID2INITW:
1678 if (grp->changed_side == 1) {
1679 grp->changed_side = 2;
1680 break;
1681 }
1682 /* process began via call to establish_conn */
1683 /* so must report failure instead of reverting */
1684 /* back to ready-for-xid passive state */
1685 if (grp->estconnfunc)
1686 goto done;
1687 /* this attnbusy is NOT the result of xside xid */
1688 /* collisions so yside must have been triggered */
1689 /* by an ATTN that was not intended to start XID */
1690 /* processing. Revert back to ready-for-xid and */
1691 /* wait for ATTN interrupt to signal xid start */
1692 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1693 fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1694 fsm_deltimer(&grp->timer);
1695 goto done;
1696 }
1697 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1698 goto done;
1699 case MPCG_STATE_XID2INITX:
1700 /* XID2 was received before ATTN Busy for second
1701 channel.Send yside xid for second channel.
1702 */
1703 if (grp->changed_side == 1) {
1704 grp->changed_side = 2;
1705 break;
1706 }
1707 case MPCG_STATE_XID0IOWAIX:
1708 case MPCG_STATE_XID7INITW:
1709 case MPCG_STATE_XID7INITX:
1710 case MPCG_STATE_XID7INITI:
1711 case MPCG_STATE_XID7INITZ:
1712 default:
1713 /* multiple attn-busy indicates too out-of-sync */
1714 /* and they are certainly not being received as part */
1715 /* of valid mpc group negotiations.. */
1716 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1717 goto done;
1718 }
1719
1720 if (grp->changed_side == 1) {
1721 fsm_deltimer(&grp->timer);
1722 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1723 MPCG_EVENT_TIMER, dev);
1724 }
1725 if (ch->in_mpcgroup)
1726 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1727 else
1728 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1729 "%s(%s): channel %s not added to group",
1730 CTCM_FUNTAIL, dev->name, ch->id);
1731
1732done:
1733 return;
1734}
1735
1736/*
1737 * ctcmpc channel FSM action
1738 * called from several points in ctcmpc_ch_fsm
1739 * ctcmpc only
1740 */
1741static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1742{
1743 struct channel *ch = arg;
1744 struct net_device *dev = ch->netdev;
1745 struct ctcm_priv *priv = dev->ml_priv;
1746 struct mpc_group *grp = priv->mpcg;
1747
1748 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1749 return;
1750}
1751
1752/*
1753 * ctcmpc channel FSM action
1754 * called from several points in ctcmpc_ch_fsm
1755 * ctcmpc only
1756 */
1757static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1758{
1759 struct channel *ach = arg;
1760 struct net_device *dev = ach->netdev;
1761 struct ctcm_priv *priv = dev->ml_priv;
1762 struct mpc_group *grp = priv->mpcg;
1763 struct channel *wch = priv->channel[CTCM_WRITE];
1764 struct channel *rch = priv->channel[CTCM_READ];
1765 struct sk_buff *skb;
1766 struct th_sweep *header;
1767 int rc = 0;
1768 unsigned long saveflags = 0;
1769
1770 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1771 __func__, smp_processor_id(), ach, ach->id);
1772
1773 if (grp->in_sweep == 0)
1774 goto done;
1775
1776 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1777 __func__, wch->th_seq_num);
1778 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1779 __func__, rch->th_seq_num);
1780
1781 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1782 /* give the previous IO time to complete */
1783 fsm_addtimer(&wch->sweep_timer,
1784 200, CTC_EVENT_RSWEEP_TIMER, wch);
1785 goto done;
1786 }
1787
1788 skb = skb_dequeue(&wch->sweep_queue);
1789 if (!skb)
1790 goto done;
1791
1792 if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1793 grp->in_sweep = 0;
1794 ctcm_clear_busy_do(dev);
1795 dev_kfree_skb_any(skb);
1796 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1797 goto done;
1798 } else {
1799 refcount_inc(&skb->users);
1800 skb_queue_tail(&wch->io_queue, skb);
1801 }
1802
1803 /* send out the sweep */
1804 wch->ccw[4].count = skb->len;
1805
1806 header = (struct th_sweep *)skb->data;
1807 switch (header->th.th_ch_flag) {
1808 case TH_SWEEP_REQ:
1809 grp->sweep_req_pend_num--;
1810 break;
1811 case TH_SWEEP_RESP:
1812 grp->sweep_rsp_pend_num--;
1813 break;
1814 }
1815
1816 header->sw.th_last_seq = wch->th_seq_num;
1817
1818 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1819 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1820 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1821
1822 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1823 fsm_newstate(wch->fsm, CTC_STATE_TX);
1824
1825 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1826 wch->prof.send_stamp = jiffies;
1827 rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1828 (unsigned long) wch, 0xff, 0);
1829 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1830
1831 if ((grp->sweep_req_pend_num == 0) &&
1832 (grp->sweep_rsp_pend_num == 0)) {
1833 grp->in_sweep = 0;
1834 rch->th_seq_num = 0x00;
1835 wch->th_seq_num = 0x00;
1836 ctcm_clear_busy_do(dev);
1837 }
1838
1839 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1840 __func__, wch->th_seq_num, rch->th_seq_num);
1841
1842 if (rc != 0)
1843 ctcm_ccw_check_rc(wch, rc, "send sweep");
1844
1845done:
1846 return;
1847}
1848
1849
1850/*
1851 * The ctcmpc statemachine for a channel.
1852 */
1853
1854const fsm_node ctcmpc_ch_fsm[] = {
1855 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop },
1856 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start },
1857 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1858 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop },
1859 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1860
1861 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop },
1862 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop },
1863 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop },
1864 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop },
1865 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start },
1866 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop },
1867 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop },
1868 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1869
1870 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1871 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop },
1872 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1873 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr },
1874 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1875 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1876
1877 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio },
1878 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode },
1879 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
1880 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1881 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1882
1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop },
1885 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
1886 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1887 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1888 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode },
1889 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1890 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1891
1892 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
1893 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop },
1894 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle },
1895 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr },
1896 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr },
1897 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr },
1898 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail },
1899 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1900 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio },
1901 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1902
1903 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop },
1904 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1905 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1906 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop },
1907 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1908 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1909 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1910 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1911 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1912 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1913
1914 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1915 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1916 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio },
1917 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop },
1918 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1919 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1920 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1921 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1922 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy },
1923 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1924 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1925
1926 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1927 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1928 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio },
1929 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop },
1930 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1931 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1932 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1933 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1934 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1935 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1936 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1937 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1938 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1939
1940 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1941 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1942 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio },
1943 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop },
1944 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1945 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1946 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1947 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1948 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1949 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1950 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1951 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1952
1953 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1954 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1955 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio },
1956 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop },
1957 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1958 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1959 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1960 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1961 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1962 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1963 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1964 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1965
1966 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1967 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1968 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio },
1969 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop },
1970 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1971 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1972 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1973 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1974 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1975 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1976 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1977 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1978
1979 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1980 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn },
1981 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio },
1982 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop },
1983 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1984 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1985 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
1986 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr },
1987 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr },
1988 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal },
1989 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend },
1990 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
1991
1992 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
1993 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop },
1994 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx },
1995 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc },
1996 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
1997 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
1998 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
1999 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx },
2000
2001 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio },
2002 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop },
2003 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle },
2004 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr },
2005 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr },
2006 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr },
2007 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2008 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2009 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2010
2011 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio },
2012 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop },
2013 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio },
2014 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2015 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2016 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2017 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2018 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2019
2020 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop },
2021 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart },
2022 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped },
2023 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2024 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2025 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2026 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2027 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2028
2029 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio },
2030 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart },
2031 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode },
2032 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop },
2033 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop },
2034 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2035 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2036
2037 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio },
2038 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop },
2039 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone },
2040 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail },
2041 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail },
2042 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry },
2043 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2044 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2045 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2046 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail },
2047
2048 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2049 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio },
2050 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal },
2051 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2052 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail },
2053};
2054
2055int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2056
2057/*
2058 * Actions for interface - statemachine.
2059 */
2060
2061/**
2062 * Startup channels by sending CTC_EVENT_START to each channel.
2063 *
2064 * fi An instance of an interface statemachine.
2065 * event The event, just happened.
2066 * arg Generic pointer, casted from struct net_device * upon call.
2067 */
2068static void dev_action_start(fsm_instance *fi, int event, void *arg)
2069{
2070 struct net_device *dev = arg;
2071 struct ctcm_priv *priv = dev->ml_priv;
2072 int direction;
2073
2074 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2075
2076 fsm_deltimer(&priv->restart_timer);
2077 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2078 if (IS_MPC(priv))
2079 priv->mpcg->channels_terminating = 0;
2080 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2081 struct channel *ch = priv->channel[direction];
2082 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2083 }
2084}
2085
2086/**
2087 * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2088 *
2089 * fi An instance of an interface statemachine.
2090 * event The event, just happened.
2091 * arg Generic pointer, casted from struct net_device * upon call.
2092 */
2093static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2094{
2095 int direction;
2096 struct net_device *dev = arg;
2097 struct ctcm_priv *priv = dev->ml_priv;
2098
2099 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2100
2101 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2102 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2103 struct channel *ch = priv->channel[direction];
2104 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2105 ch->th_seq_num = 0x00;
2106 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2107 __func__, ch->th_seq_num);
2108 }
2109 if (IS_MPC(priv))
2110 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2111}
2112
2113static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2114{
2115 int restart_timer;
2116 struct net_device *dev = arg;
2117 struct ctcm_priv *priv = dev->ml_priv;
2118
2119 CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2120
2121 if (IS_MPC(priv)) {
2122 restart_timer = CTCM_TIME_1_SEC;
2123 } else {
2124 restart_timer = CTCM_TIME_5_SEC;
2125 }
2126 dev_info(&dev->dev, "Restarting device\n");
2127
2128 dev_action_stop(fi, event, arg);
2129 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2130 if (IS_MPC(priv))
2131 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2132
2133 /* going back into start sequence too quickly can */
2134 /* result in the other side becoming unreachable due */
2135 /* to sense reported when IO is aborted */
2136 fsm_addtimer(&priv->restart_timer, restart_timer,
2137 DEV_EVENT_START, dev);
2138}
2139
2140/**
2141 * Called from channel statemachine
2142 * when a channel is up and running.
2143 *
2144 * fi An instance of an interface statemachine.
2145 * event The event, just happened.
2146 * arg Generic pointer, casted from struct net_device * upon call.
2147 */
2148static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2149{
2150 struct net_device *dev = arg;
2151 struct ctcm_priv *priv = dev->ml_priv;
2152 int dev_stat = fsm_getstate(fi);
2153
2154 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2155 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2156 dev->name, dev->ml_priv, dev_stat, event);
2157
2158 switch (fsm_getstate(fi)) {
2159 case DEV_STATE_STARTWAIT_RXTX:
2160 if (event == DEV_EVENT_RXUP)
2161 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2162 else
2163 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2164 break;
2165 case DEV_STATE_STARTWAIT_RX:
2166 if (event == DEV_EVENT_RXUP) {
2167 fsm_newstate(fi, DEV_STATE_RUNNING);
2168 dev_info(&dev->dev,
2169 "Connected with remote side\n");
2170 ctcm_clear_busy(dev);
2171 }
2172 break;
2173 case DEV_STATE_STARTWAIT_TX:
2174 if (event == DEV_EVENT_TXUP) {
2175 fsm_newstate(fi, DEV_STATE_RUNNING);
2176 dev_info(&dev->dev,
2177 "Connected with remote side\n");
2178 ctcm_clear_busy(dev);
2179 }
2180 break;
2181 case DEV_STATE_STOPWAIT_TX:
2182 if (event == DEV_EVENT_RXUP)
2183 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2184 break;
2185 case DEV_STATE_STOPWAIT_RX:
2186 if (event == DEV_EVENT_TXUP)
2187 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188 break;
2189 }
2190
2191 if (IS_MPC(priv)) {
2192 if (event == DEV_EVENT_RXUP)
2193 mpc_channel_action(priv->channel[CTCM_READ],
2194 CTCM_READ, MPC_CHANNEL_ADD);
2195 else
2196 mpc_channel_action(priv->channel[CTCM_WRITE],
2197 CTCM_WRITE, MPC_CHANNEL_ADD);
2198 }
2199}
2200
2201/**
2202 * Called from device statemachine
2203 * when a channel has been shutdown.
2204 *
2205 * fi An instance of an interface statemachine.
2206 * event The event, just happened.
2207 * arg Generic pointer, casted from struct net_device * upon call.
2208 */
2209static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2210{
2211
2212 struct net_device *dev = arg;
2213 struct ctcm_priv *priv = dev->ml_priv;
2214
2215 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2216
2217 switch (fsm_getstate(fi)) {
2218 case DEV_STATE_RUNNING:
2219 if (event == DEV_EVENT_TXDOWN)
2220 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2221 else
2222 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2223 break;
2224 case DEV_STATE_STARTWAIT_RX:
2225 if (event == DEV_EVENT_TXDOWN)
2226 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2227 break;
2228 case DEV_STATE_STARTWAIT_TX:
2229 if (event == DEV_EVENT_RXDOWN)
2230 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231 break;
2232 case DEV_STATE_STOPWAIT_RXTX:
2233 if (event == DEV_EVENT_TXDOWN)
2234 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2235 else
2236 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2237 break;
2238 case DEV_STATE_STOPWAIT_RX:
2239 if (event == DEV_EVENT_RXDOWN)
2240 fsm_newstate(fi, DEV_STATE_STOPPED);
2241 break;
2242 case DEV_STATE_STOPWAIT_TX:
2243 if (event == DEV_EVENT_TXDOWN)
2244 fsm_newstate(fi, DEV_STATE_STOPPED);
2245 break;
2246 }
2247 if (IS_MPC(priv)) {
2248 if (event == DEV_EVENT_RXDOWN)
2249 mpc_channel_action(priv->channel[CTCM_READ],
2250 CTCM_READ, MPC_CHANNEL_REMOVE);
2251 else
2252 mpc_channel_action(priv->channel[CTCM_WRITE],
2253 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2254 }
2255}
2256
2257const fsm_node dev_fsm[] = {
2258 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start },
2259 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start },
2260 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2261 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2262 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2263 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start },
2264 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2265 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2266 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown },
2267 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2268 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start },
2269 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2270 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2271 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown },
2272 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2273 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop },
2274 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup },
2275 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup },
2276 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown },
2277 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown },
2278 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2279 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop },
2280 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup },
2281 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup },
2282 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown },
2283 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart },
2284 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop },
2285 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup },
2286 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup },
2287 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown },
2288 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart },
2289 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop },
2290 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown },
2291 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown },
2292 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop },
2293 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop },
2294 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart },
2295};
2296
2297int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2298
2299/* --- This is the END my friend --- */
2300