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 
51 const 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 
62 const 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 
72 const 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 
103 const 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 
132 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
133 
134 /*
135  * ----- static ctcm actions for channel statemachine -----
136  *
137 */
138 static void chx_txdone(fsm_instance *fi, int event, void *arg);
139 static void chx_rx(fsm_instance *fi, int event, void *arg);
140 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
141 static void chx_firstio(fsm_instance *fi, int event, void *arg);
142 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
143 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
144 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
145 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
146 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
147 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
148 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
149 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
150 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
151 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
152 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
153 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
154 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
155 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
156 
157 /*
158  * ----- static ctcmpc actions for ctcmpc channel statemachine -----
159  *
160 */
161 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
162 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
163 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
164 /* shared :
165 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
166 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
167 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
168 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
169 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
170 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
171 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
172 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
173 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
174 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
175 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
176 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
177 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
178 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
179 */
180 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
181 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
182 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
183 static 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  */
ctcm_ccw_check_rc(struct channel * ch,int rc,char * msg)191 void 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 
ctcm_purge_skb_queue(struct sk_buff_head * q)214 void 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  */
ctcm_action_nop(fsm_instance * fi,int event,void * arg)229 static 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  */
chx_txdone(fsm_instance * fi,int event,void * arg)246 static 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  */
ctcm_chx_txidle(fsm_instance * fi,int event,void * arg)335 void 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  */
chx_rx(fsm_instance * fi,int event,void * arg)356 static 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  */
chx_firstio(fsm_instance * fi,int event,void * arg)433 static 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  */
chx_rxidle(fsm_instance * fi,int event,void * arg)512 static 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  */
ctcm_chx_setmode(fsm_instance * fi,int event,void * arg)552 static 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  */
ctcm_chx_start(fsm_instance * fi,int event,void * arg)593 static 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  */
ctcm_chx_haltio(fsm_instance * fi,int event,void * arg)656 static 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  */
ctcm_chx_cleanup(fsm_instance * fi,int state,struct channel * ch)698 static 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  */
ctcm_chx_stopped(fsm_instance * fi,int event,void * arg)744 static 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  */
ctcm_chx_stop(fsm_instance * fi,int event,void * arg)757 static 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  */
ctcm_chx_fail(fsm_instance * fi,int event,void * arg)771 static 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  */
ctcm_chx_setuperr(fsm_instance * fi,int event,void * arg)783 static 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  */
ctcm_chx_restart(fsm_instance * fi,int event,void * arg)832 static 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  */
ctcm_chx_rxiniterr(fsm_instance * fi,int event,void * arg)874 static 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  */
ctcm_chx_rxinitfail(fsm_instance * fi,int event,void * arg)909 static 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  */
ctcm_chx_rxdisc(fsm_instance * fi,int event,void * arg)929 static 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  */
ctcm_chx_txiniterr(fsm_instance * fi,int event,void * arg)961 static 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  */
ctcm_chx_txretry(fsm_instance * fi,int event,void * arg)993 static 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 	}
1055 done:
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  */
ctcm_chx_iofatal(fsm_instance * fi,int event,void * arg)1066 static 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  */
1094 const 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 
1192 int 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  */
ctcmpc_chx_txdone(fsm_instance * fi,int event,void * arg)1216 static 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 	}
1373 done:
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  */
ctcmpc_chx_rx(fsm_instance * fi,int event,void * arg)1386 static 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 
1447 again:
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  */
ctcmpc_chx_firstio(fsm_instance * fi,int event,void * arg)1488 static 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 
1527 done:
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  */
ctcmpc_chx_rxidle(fsm_instance * fi,int event,void * arg)1542 void 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);
1588 done:
1589 	return;
1590 }
1591 
1592 /*
1593  * ctcmpc channel FSM action
1594  * called from several points in ctcmpc_ch_fsm
1595  * ctcmpc only
1596  */
ctcmpc_chx_attn(fsm_instance * fsm,int event,void * arg)1597 static 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  */
ctcmpc_chx_attnbusy(fsm_instance * fsm,int event,void * arg)1656 static 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 
1732 done:
1733 	return;
1734 }
1735 
1736 /*
1737  * ctcmpc channel FSM action
1738  * called from several points in ctcmpc_ch_fsm
1739  * ctcmpc only
1740  */
ctcmpc_chx_resend(fsm_instance * fsm,int event,void * arg)1741 static 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  */
ctcmpc_chx_send_sweep(fsm_instance * fsm,int event,void * arg)1757 static 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 
1845 done:
1846 	return;
1847 }
1848 
1849 
1850 /*
1851  * The ctcmpc statemachine for a channel.
1852  */
1853 
1854 const 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 
2055 int 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  */
dev_action_start(fsm_instance * fi,int event,void * arg)2068 static 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  */
dev_action_stop(fsm_instance * fi,int event,void * arg)2093 static 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 
dev_action_restart(fsm_instance * fi,int event,void * arg)2113 static 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  */
dev_action_chup(fsm_instance * fi,int event,void * arg)2148 static 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  */
dev_action_chdown(fsm_instance * fi,int event,void * arg)2209 static 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 
2257 const 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 
2297 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2298 
2299 /* --- This is the END my friend --- */
2300 
2301