text: // SPDX-License-Identifier: GPL-2.0
  /*
   * Copyright IBM Corp. 2001, 2007
   * Authors:	Fritz Elfert (felfert@millenux.com)
   * 		Peter Tiedemann (ptiedem@de.ibm.com)
   *	MPC additions :
   *		Belinda Thompson (belindat@us.ibm.com)
   *		Andy Richter (richtera@us.ibm.com)
   */
  
  #undef DEBUG
  #undef DEBUGDATA
  #undef DEBUGCCW
  
  #define KMSG_COMPONENT "ctcm"
  #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/errno.h>
  #include <linux/types.h>
  #include <linux/interrupt.h>
  #include <linux/timer.h>
  #include <linux/bitops.h>
  
  #include <linux/signal.h>
  #include <linux/string.h>
  
  #include <linux/ip.h>
  #include <linux/if_arp.h>
  #include <linux/tcp.h>
  #include <linux/skbuff.h>
  #include <linux/ctype.h>
  #include <net/dst.h>
  
  #include <linux/io.h>
  #include <asm/ccwdev.h>
  #include <asm/ccwgroup.h>
  #include <linux/uaccess.h>
  
  #include <asm/idals.h>
  
  #include "fsm.h"
  
  #include "ctcm_dbug.h"
  #include "ctcm_main.h"
  #include "ctcm_fsms.h"
  
  const char *dev_state_names[] = {
  	[DEV_STATE_STOPPED]		= "Stopped",
  	[DEV_STATE_STARTWAIT_RXTX]	= "StartWait RXTX",
  	[DEV_STATE_STARTWAIT_RX]	= "StartWait RX",
  	[DEV_STATE_STARTWAIT_TX]	= "StartWait TX",
  	[DEV_STATE_STOPWAIT_RXTX]	= "StopWait RXTX",
  	[DEV_STATE_STOPWAIT_RX]		= "StopWait RX",
  	[DEV_STATE_STOPWAIT_TX]		= "StopWait TX",
  	[DEV_STATE_RUNNING]		= "Running",
  };
  
  const char *dev_event_names[] = {
  	[DEV_EVENT_START]	= "Start",
  	[DEV_EVENT_STOP]	= "Stop",
  	[DEV_EVENT_RXUP]	= "RX up",
  	[DEV_EVENT_TXUP]	= "TX up",
  	[DEV_EVENT_RXDOWN]	= "RX down",
  	[DEV_EVENT_TXDOWN]	= "TX down",
  	[DEV_EVENT_RESTART]	= "Restart",
  };
  
  const char *ctc_ch_event_names[] = {
  	[CTC_EVENT_IO_SUCCESS]	= "ccw_device success",
  	[CTC_EVENT_IO_EBUSY]	= "ccw_device busy",
  	[CTC_EVENT_IO_ENODEV]	= "ccw_device enodev",
  	[CTC_EVENT_IO_UNKNOWN]	= "ccw_device unknown",
  	[CTC_EVENT_ATTNBUSY]	= "Status ATTN & BUSY",
  	[CTC_EVENT_ATTN]	= "Status ATTN",
  	[CTC_EVENT_BUSY]	= "Status BUSY",
  	[CTC_EVENT_UC_RCRESET]	= "Unit check remote reset",
  	[CTC_EVENT_UC_RSRESET]	= "Unit check remote system reset",
  	[CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
  	[CTC_EVENT_UC_TXPARITY]	= "Unit check TX parity",
  	[CTC_EVENT_UC_HWFAIL]	= "Unit check Hardware failure",
  	[CTC_EVENT_UC_RXPARITY]	= "Unit check RX parity",
  	[CTC_EVENT_UC_ZERO]	= "Unit check ZERO",
  	[CTC_EVENT_UC_UNKNOWN]	= "Unit check Unknown",
  	[CTC_EVENT_SC_UNKNOWN]	= "SubChannel check Unknown",
  	[CTC_EVENT_MC_FAIL]	= "Machine check failure",
  	[CTC_EVENT_MC_GOOD]	= "Machine check operational",
  	[CTC_EVENT_IRQ]		= "IRQ normal",
  	[CTC_EVENT_FINSTAT]	= "IRQ final",
  	[CTC_EVENT_TIMER]	= "Timer",
  	[CTC_EVENT_START]	= "Start",
  	[CTC_EVENT_STOP]	= "Stop",
  	/*
  	* additional MPC events
  	*/
  	[CTC_EVENT_SEND_XID]	= "XID Exchange",
  	[CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
  };
  
  const char *ctc_ch_state_names[] = {
  	[CTC_STATE_IDLE]	= "Idle",
  	[CTC_STATE_STOPPED]	= "Stopped",
  	[CTC_STATE_STARTWAIT]	= "StartWait",
  	[CTC_STATE_STARTRETRY]	= "StartRetry",
  	[CTC_STATE_SETUPWAIT]	= "SetupWait",
  	[CTC_STATE_RXINIT]	= "RX init",
  	[CTC_STATE_TXINIT]	= "TX init",
  	[CTC_STATE_RX]		= "RX",
  	[CTC_STATE_TX]		= "TX",
  	[CTC_STATE_RXIDLE]	= "RX idle",
  	[CTC_STATE_TXIDLE]	= "TX idle",
  	[CTC_STATE_RXERR]	= "RX error",
  	[CTC_STATE_TXERR]	= "TX error",
  	[CTC_STATE_TERM]	= "Terminating",
  	[CTC_STATE_DTERM]	= "Restarting",
  	[CTC_STATE_NOTOP]	= "Not operational",
  	/*
  	* additional MPC states
  	*/
  	[CH_XID0_PENDING]	= "Pending XID0 Start",
  	[CH_XID0_INPROGRESS]	= "In XID0 Negotiations ",
  	[CH_XID7_PENDING]	= "Pending XID7 P1 Start",
  	[CH_XID7_PENDING1]	= "Active XID7 P1 Exchange ",
  	[CH_XID7_PENDING2]	= "Pending XID7 P2 Start ",
  	[CH_XID7_PENDING3]	= "Active XID7 P2 Exchange ",
  	[CH_XID7_PENDING4]	= "XID7 Complete - Pending READY ",
  };
  
  static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
  
  /*
   * ----- static ctcm actions for channel statemachine -----
   *
  */
  static void chx_txdone(fsm_instance *fi, int event, void *arg);
  static void chx_rx(fsm_instance *fi, int event, void *arg);
  static void chx_rxidle(fsm_instance *fi, int event, void *arg);
  static void chx_firstio(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
  
  /*
   * ----- static ctcmpc actions for ctcmpc channel statemachine -----
   *
  */
  static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
  static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
  static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
  /* shared :
  static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
  static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
  */
  static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
  static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
  static void ctcmpc_chx_resend(fsm_instance *, int, void *);
  static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
  
  /**
   * Check return code of a preceding ccw_device call, halt_IO etc...
   *
   * ch	:	The channel, the error belongs to.
   * Returns the error code (!= 0) to inspect.
   */
  void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
  {
  	CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  		"%s(%s): %s: %04x\n",
  		CTCM_FUNTAIL, ch->id, msg, rc);
  	switch (rc) {
  	case -EBUSY:
  		pr_info("%s: The communication peer is busy\n",
  			ch->id);
  		fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
  		break;
  	case -ENODEV:
  		pr_err("%s: The specified target device is not valid\n",
  		       ch->id);
  		fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
  		break;
  	default:
  		pr_err("An I/O operation resulted in error %04x\n",
  		       rc);
  		fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
  	}
  }
  
  void ctcm_purge_skb_queue(struct sk_buff_head *q)
  {
  	struct sk_buff *skb;
  
  	CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
  
  	while ((skb = skb_dequeue(q))) {
  		refcount_dec(&skb->users);
  		dev_kfree_skb_any(skb);
  	}
  }
  
  /**
   * NOP action for statemachines
   */
  static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
  {
  }
  
  /*
   * Actions for channel - statemachines.
   */
  
  /**
   * Normal data has been send. Free the corresponding
   * skb (it's in io_queue), reset dev->tbusy and
   * revert to idle state.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void chx_txdone(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	struct sk_buff *skb;
  	int first = 1;
  	int i;
  	unsigned long duration;
  	unsigned long done_stamp = jiffies;
  
  	CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
  
  	duration = done_stamp - ch->prof.send_stamp;
  	if (duration > ch->prof.tx_time)
  		ch->prof.tx_time = duration;
  
  	if (ch->irb->scsw.cmd.count != 0)
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
  			"%s(%s): TX not complete, remaining %d bytes",
  			     CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
  	fsm_deltimer(&ch->timer);
  	while ((skb = skb_dequeue(&ch->io_queue))) {
  		priv->stats.tx_packets++;
  		priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
  		if (first) {
  			priv->stats.tx_bytes += 2;
  			first = 0;
  		}
  		refcount_dec(&skb->users);
  		dev_kfree_skb_irq(skb);
  	}
  	spin_lock(&ch->collect_lock);
  	clear_normalized_cda(&ch->ccw[4]);
  	if (ch->collect_len > 0) {
  		int rc;
  
  		if (ctcm_checkalloc_buffer(ch)) {
  			spin_unlock(&ch->collect_lock);
  			return;
  		}
  		ch->trans_skb->data = ch->trans_skb_data;
  		skb_reset_tail_pointer(ch->trans_skb);
  		ch->trans_skb->len = 0;
  		if (ch->prof.maxmulti < (ch->collect_len + 2))
  			ch->prof.maxmulti = ch->collect_len + 2;
  		if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
  			ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
  		*((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
  		i = 0;
  		while ((skb = skb_dequeue(&ch->collect_queue))) {
  			skb_copy_from_linear_data(skb,
  				skb_put(ch->trans_skb, skb->len), skb->len);
  			priv->stats.tx_packets++;
  			priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
  			refcount_dec(&skb->users);
  			dev_kfree_skb_irq(skb);
  			i++;
  		}
  		ch->collect_len = 0;
  		spin_unlock(&ch->collect_lock);
  		ch->ccw[1].count = ch->trans_skb->len;
  		fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  		ch->prof.send_stamp = jiffies;
  		rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  		ch->prof.doios_multi++;
  		if (rc != 0) {
  			priv->stats.tx_dropped += i;
  			priv->stats.tx_errors += i;
  			fsm_deltimer(&ch->timer);
  			ctcm_ccw_check_rc(ch, rc, "chained TX");
  		}
  	} else {
  		spin_unlock(&ch->collect_lock);
  		fsm_newstate(fi, CTC_STATE_TXIDLE);
  	}
  	ctcm_clear_busy_do(dev);
  }
  
  /**
   * Initial data is sent.
   * Notify device statemachine that we are up and
   * running.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
  
  	fsm_deltimer(&ch->timer);
  	fsm_newstate(fi, CTC_STATE_TXIDLE);
  	fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
  }
  
  /**
   * Got normal data, check for sanity, queue it up, allocate new buffer
   * trigger bottom half, and initiate next read.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void chx_rx(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
  	struct sk_buff *skb = ch->trans_skb;
  	__u16 block_len = *((__u16 *)skb->data);
  	int check_len;
  	int rc;
  
  	fsm_deltimer(&ch->timer);
  	if (len < 8) {
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  			"%s(%s): got packet with length %d < 8\n",
  					CTCM_FUNTAIL, dev->name, len);
  		priv->stats.rx_dropped++;
  		priv->stats.rx_length_errors++;
  						goto again;
  	}
  	if (len > ch->max_bufsize) {
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  			"%s(%s): got packet with length %d > %d\n",
  				CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
  		priv->stats.rx_dropped++;
  		priv->stats.rx_length_errors++;
  						goto again;
  	}
  
  	/*
  	 * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
  	 */
  	switch (ch->protocol) {
  	case CTCM_PROTO_S390:
  	case CTCM_PROTO_OS390:
  		check_len = block_len + 2;
  		break;
  	default:
  		check_len = block_len;
  		break;
  	}
  	if ((len < block_len) || (len > check_len)) {
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  			"%s(%s): got block length %d != rx length %d\n",
  				CTCM_FUNTAIL, dev->name, block_len, len);
  		if (do_debug)
  			ctcmpc_dump_skb(skb, 0);
  
  		*((__u16 *)skb->data) = len;
  		priv->stats.rx_dropped++;
  		priv->stats.rx_length_errors++;
  						goto again;
  	}
  	if (block_len > 2) {
  		*((__u16 *)skb->data) = block_len - 2;
  		ctcm_unpack_skb(ch, skb);
  	}
   again:
  	skb->data = ch->trans_skb_data;
  	skb_reset_tail_pointer(skb);
  	skb->len = 0;
  	if (ctcm_checkalloc_buffer(ch))
  		return;
  	ch->ccw[1].count = ch->max_bufsize;
  	rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  	if (rc != 0)
  		ctcm_ccw_check_rc(ch, rc, "normal RX");
  }
  
  /**
   * Initialize connection by sending a __u16 of value 0.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void chx_firstio(fsm_instance *fi, int event, void *arg)
  {
  	int rc;
  	struct channel *ch = arg;
  	int fsmstate = fsm_getstate(fi);
  
  	CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  		"%s(%s) : %02x",
  		CTCM_FUNTAIL, ch->id, fsmstate);
  
  	ch->sense_rc = 0;	/* reset unit check report control */
  	if (fsmstate == CTC_STATE_TXIDLE)
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
  			"%s(%s): remote side issued READ?, init.\n",
  				CTCM_FUNTAIL, ch->id);
  	fsm_deltimer(&ch->timer);
  	if (ctcm_checkalloc_buffer(ch))
  		return;
  	if ((fsmstate == CTC_STATE_SETUPWAIT) &&
  	    (ch->protocol == CTCM_PROTO_OS390)) {
  		/* OS/390 resp. z/OS */
  		if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
  			*((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
  			fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
  				     CTC_EVENT_TIMER, ch);
  			chx_rxidle(fi, event, arg);
  		} else {
  			struct net_device *dev = ch->netdev;
  			struct ctcm_priv *priv = dev->ml_priv;
  			fsm_newstate(fi, CTC_STATE_TXIDLE);
  			fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
  		}
  		return;
  	}
  	/*
  	 * Don't setup a timer for receiving the initial RX frame
  	 * if in compatibility mode, since VM TCP delays the initial
  	 * frame until it has some data to send.
  	 */
  	if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
  	    (ch->protocol != CTCM_PROTO_S390))
  		fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  
  	*((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
  	ch->ccw[1].count = 2;	/* Transfer only length */
  
  	fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
  		     ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
  	rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  	if (rc != 0) {
  		fsm_deltimer(&ch->timer);
  		fsm_newstate(fi, CTC_STATE_SETUPWAIT);
  		ctcm_ccw_check_rc(ch, rc, "init IO");
  	}
  	/*
  	 * If in compatibility mode since we don't setup a timer, we
  	 * also signal RX channel up immediately. This enables us
  	 * to send packets early which in turn usually triggers some
  	 * reply from VM TCP which brings up the RX channel to it's
  	 * final state.
  	 */
  	if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
  	    (ch->protocol == CTCM_PROTO_S390)) {
  		struct net_device *dev = ch->netdev;
  		struct ctcm_priv *priv = dev->ml_priv;
  		fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
  	}
  }
  
  /**
   * Got initial data, check it. If OK,
   * notify device statemachine that we are up and
   * running.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void chx_rxidle(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	__u16 buflen;
  	int rc;
  
  	fsm_deltimer(&ch->timer);
  	buflen = *((__u16 *)ch->trans_skb->data);
  	CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
  			__func__, dev->name, buflen);
  
  	if (buflen >= CTCM_INITIAL_BLOCKLEN) {
  		if (ctcm_checkalloc_buffer(ch))
  			return;
  		ch->ccw[1].count = ch->max_bufsize;
  		fsm_newstate(fi, CTC_STATE_RXIDLE);
  		rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  		if (rc != 0) {
  			fsm_newstate(fi, CTC_STATE_RXINIT);
  			ctcm_ccw_check_rc(ch, rc, "initial RX");
  		} else
  			fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
  	} else {
  		CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
  				__func__, dev->name,
  					buflen, CTCM_INITIAL_BLOCKLEN);
  		chx_firstio(fi, event, arg);
  	}
  }
  
  /**
   * Set channel into extended mode.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	int rc;
  	unsigned long saveflags = 0;
  	int timeout = CTCM_TIME_5_SEC;
  
  	fsm_deltimer(&ch->timer);
  	if (IS_MPC(ch)) {
  		timeout = 1500;
  		CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
  				__func__, smp_processor_id(), ch, ch->id);
  	}
  	fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
  	fsm_newstate(fi, CTC_STATE_SETUPWAIT);
  	CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
  
  	if (event == CTC_EVENT_TIMER)	/* only for timer not yet locked */
  		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  			/* Such conditional locking is undeterministic in
  			 * static view. => ignore sparse warnings here. */
  
  	rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0);
  	if (event == CTC_EVENT_TIMER)	/* see above comments */
  		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
  	if (rc != 0) {
  		fsm_deltimer(&ch->timer);
  		fsm_newstate(fi, CTC_STATE_STARTWAIT);
  		ctcm_ccw_check_rc(ch, rc, "set Mode");
  	} else
  		ch->retry = 0;
  }
  
  /**
   * Setup channel.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch	= arg;
  	unsigned long saveflags;
  	int rc;
  
  	CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
  		CTCM_FUNTAIL, ch->id,
  		(CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
  
  	if (ch->trans_skb != NULL) {
  		clear_normalized_cda(&ch->ccw[1]);
  		dev_kfree_skb(ch->trans_skb);
  		ch->trans_skb = NULL;
  	}
  	if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
  		ch->ccw[1].cmd_code = CCW_CMD_READ;
  		ch->ccw[1].flags = CCW_FLAG_SLI;
  		ch->ccw[1].count = 0;
  	} else {
  		ch->ccw[1].cmd_code = CCW_CMD_WRITE;
  		ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
  		ch->ccw[1].count = 0;
  	}
  	if (ctcm_checkalloc_buffer(ch)) {
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
  			"%s(%s): %s trans_skb alloc delayed "
  			"until first transfer",
  			CTCM_FUNTAIL, ch->id,
  			(CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
  				"RX" : "TX");
  	}
  	ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
  	ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
  	ch->ccw[0].count = 0;
  	ch->ccw[0].cda = 0;
  	ch->ccw[2].cmd_code = CCW_CMD_NOOP;	/* jointed CE + DE */
  	ch->ccw[2].flags = CCW_FLAG_SLI;
  	ch->ccw[2].count = 0;
  	ch->ccw[2].cda = 0;
  	memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
  	ch->ccw[4].cda = 0;
  	ch->ccw[4].flags &= ~CCW_FLAG_IDA;
  
  	fsm_newstate(fi, CTC_STATE_STARTWAIT);
  	fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
  	spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  	rc = ccw_device_halt(ch->cdev, 0);
  	spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
  	if (rc != 0) {
  		if (rc != -EBUSY)
  			fsm_deltimer(&ch->timer);
  		ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
  	}
  }
  
  /**
   * Shutdown a channel.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	unsigned long saveflags = 0;
  	int rc;
  	int oldstate;
  
  	fsm_deltimer(&ch->timer);
  	if (IS_MPC(ch))
  		fsm_deltimer(&ch->sweep_timer);
  
  	fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  
  	if (event == CTC_EVENT_STOP)	/* only for STOP not yet locked */
  		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  			/* Such conditional locking is undeterministic in
  			 * static view. => ignore sparse warnings here. */
  	oldstate = fsm_getstate(fi);
  	fsm_newstate(fi, CTC_STATE_TERM);
  	rc = ccw_device_halt(ch->cdev, 0);
  
  	if (event == CTC_EVENT_STOP)
  		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
  			/* see remark above about conditional locking */
  
  	if (rc != 0 && rc != -EBUSY) {
  		fsm_deltimer(&ch->timer);
  		if (event != CTC_EVENT_STOP) {
  			fsm_newstate(fi, oldstate);
  			ctcm_ccw_check_rc(ch, rc, (char *)__func__);
  		}
  	}
  }
  
  /**
   * Cleanup helper for chx_fail and chx_stopped
   * cleanup channels queue and notify interface statemachine.
   *
   * fi		An instance of a channel statemachine.
   * state	The next state (depending on caller).
   * ch		The channel to operate on.
   */
  static void ctcm_chx_cleanup(fsm_instance *fi, int state,
  		struct channel *ch)
  {
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
  			"%s(%s): %s[%d]\n",
  			CTCM_FUNTAIL, dev->name, ch->id, state);
  
  	fsm_deltimer(&ch->timer);
  	if (IS_MPC(ch))
  		fsm_deltimer(&ch->sweep_timer);
  
  	fsm_newstate(fi, state);
  	if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
  		clear_normalized_cda(&ch->ccw[1]);
  		dev_kfree_skb_any(ch->trans_skb);
  		ch->trans_skb = NULL;
  	}
  
  	ch->th_seg = 0x00;
  	ch->th_seq_num = 0x00;
  	if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
  		skb_queue_purge(&ch->io_queue);
  		fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  	} else {
  		ctcm_purge_skb_queue(&ch->io_queue);
  		if (IS_MPC(ch))
  			ctcm_purge_skb_queue(&ch->sweep_queue);
  		spin_lock(&ch->collect_lock);
  		ctcm_purge_skb_queue(&ch->collect_queue);
  		ch->collect_len = 0;
  		spin_unlock(&ch->collect_lock);
  		fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  	}
  }
  
  /**
   * A channel has successfully been halted.
   * Cleanup it's queue and notify interface statemachine.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
  {
  	ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
  }
  
  /**
   * A stop command from device statemachine arrived and we are in
   * not operational mode. Set state to stopped.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
  {
  	fsm_newstate(fi, CTC_STATE_STOPPED);
  }
  
  /**
   * A machine check for no path, not operational status or gone device has
   * happened.
   * Cleanup queue and notify interface statemachine.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
  {
  	ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
  }
  
  /**
   * Handle error during setup of channel.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	/*
  	 * Special case: Got UC_RCRESET on setmode.
  	 * This means that remote side isn't setup. In this case
  	 * simply retry after some 10 secs...
  	 */
  	if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
  	    ((event == CTC_EVENT_UC_RCRESET) ||
  	     (event == CTC_EVENT_UC_RSRESET))) {
  		fsm_newstate(fi, CTC_STATE_STARTRETRY);
  		fsm_deltimer(&ch->timer);
  		fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  		if (!IS_MPC(ch) &&
  		    (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
  			int rc = ccw_device_halt(ch->cdev, 0);
  			if (rc != 0)
  				ctcm_ccw_check_rc(ch, rc,
  					"HaltIO in chx_setuperr");
  		}
  		return;
  	}
  
  	CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
  		"%s(%s) : %s error during %s channel setup state=%s\n",
  		CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
  		(CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
  		fsm_getstate_str(fi));
  
  	if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
  		fsm_newstate(fi, CTC_STATE_RXERR);
  		fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  	} else {
  		fsm_newstate(fi, CTC_STATE_TXERR);
  		fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  	}
  }
  
  /**
   * Restart a channel after an error.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	unsigned long saveflags = 0;
  	int oldstate;
  	int rc;
  
  	CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  		"%s: %s[%d] of %s\n",
  			CTCM_FUNTAIL, ch->id, event, dev->name);
  
  	fsm_deltimer(&ch->timer);
  
  	fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  	oldstate = fsm_getstate(fi);
  	fsm_newstate(fi, CTC_STATE_STARTWAIT);
  	if (event == CTC_EVENT_TIMER)	/* only for timer not yet locked */
  		spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  			/* Such conditional locking is a known problem for
  			 * sparse because its undeterministic in static view.
  			 * Warnings should be ignored here. */
  	rc = ccw_device_halt(ch->cdev, 0);
  	if (event == CTC_EVENT_TIMER)
  		spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
  	if (rc != 0) {
  		if (rc != -EBUSY) {
  		    fsm_deltimer(&ch->timer);
  		    fsm_newstate(fi, oldstate);
  		}
  		ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
  	}
  }
  
  /**
   * Handle error during RX initial handshake (exchange of
   * 0-length block header)
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	if (event == CTC_EVENT_TIMER) {
  		if (!IS_MPCDEV(dev))
  			/* TODO : check if MPC deletes timer somewhere */
  			fsm_deltimer(&ch->timer);
  		if (ch->retry++ < 3)
  			ctcm_chx_restart(fi, event, arg);
  		else {
  			fsm_newstate(fi, CTC_STATE_RXERR);
  			fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  		}
  	} else {
  		CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  			"%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
  			ctc_ch_event_names[event], fsm_getstate_str(fi));
  
  		dev_warn(&dev->dev,
  			"Initialization failed with RX/TX init handshake "
  			"error %s\n", ctc_ch_event_names[event]);
  	}
  }
  
  /**
   * Notify device statemachine if we gave up initialization
   * of RX channel.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  			"%s(%s): RX %s busy, init. fail",
  				CTCM_FUNTAIL, dev->name, ch->id);
  	fsm_newstate(fi, CTC_STATE_RXERR);
  	fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  }
  
  /**
   * Handle RX Unit check remote reset (remote disconnected)
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct channel *ch2;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
  			"%s: %s: remote disconnect - re-init ...",
  				CTCM_FUNTAIL, dev->name);
  	fsm_deltimer(&ch->timer);
  	/*
  	 * Notify device statemachine
  	 */
  	fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  	fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  
  	fsm_newstate(fi, CTC_STATE_DTERM);
  	ch2 = priv->channel[CTCM_WRITE];
  	fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
  
  	ccw_device_halt(ch->cdev, 0);
  	ccw_device_halt(ch2->cdev, 0);
  }
  
  /**
   * Handle error during TX channel initialization.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	if (event == CTC_EVENT_TIMER) {
  		fsm_deltimer(&ch->timer);
  		if (ch->retry++ < 3)
  			ctcm_chx_restart(fi, event, arg);
  		else {
  			fsm_newstate(fi, CTC_STATE_TXERR);
  			fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  		}
  	} else {
  		CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  			"%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
  			ctc_ch_event_names[event], fsm_getstate_str(fi));
  
  		dev_warn(&dev->dev,
  			"Initialization failed with RX/TX init handshake "
  			"error %s\n", ctc_ch_event_names[event]);
  	}
  }
  
  /**
   * Handle TX timeout by retrying operation.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	struct sk_buff *skb;
  
  	CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
  			__func__, smp_processor_id(), ch, ch->id);
  
  	fsm_deltimer(&ch->timer);
  	if (ch->retry++ > 3) {
  		struct mpc_group *gptr = priv->mpcg;
  		CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
  				"%s: %s: retries exceeded",
  					CTCM_FUNTAIL, ch->id);
  		fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  		/* call restart if not MPC or if MPC and mpcg fsm is ready.
  			use gptr as mpc indicator */
  		if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
  			ctcm_chx_restart(fi, event, arg);
  				goto done;
  	}
  
  	CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
  			"%s : %s: retry %d",
  				CTCM_FUNTAIL, ch->id, ch->retry);
  	skb = skb_peek(&ch->io_queue);
  	if (skb) {
  		int rc = 0;
  		unsigned long saveflags = 0;
  		clear_normalized_cda(&ch->ccw[4]);
  		ch->ccw[4].count = skb->len;
  		if (set_normalized_cda(&ch->ccw[4], skb->data)) {
  			CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
  				"%s: %s: IDAL alloc failed",
  						CTCM_FUNTAIL, ch->id);
  			fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  			ctcm_chx_restart(fi, event, arg);
  				goto done;
  		}
  		fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
  		if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
  			spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  			/* Such conditional locking is a known problem for
  			 * sparse because its undeterministic in static view.
  			 * Warnings should be ignored here. */
  		if (do_debug_ccw)
  			ctcmpc_dumpit((char *)&ch->ccw[3],
  					sizeof(struct ccw1) * 3);
  
  		rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 0xff, 0);
  		if (event == CTC_EVENT_TIMER)
  			spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
  					saveflags);
  		if (rc != 0) {
  			fsm_deltimer(&ch->timer);
  			ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
  			ctcm_purge_skb_queue(&ch->io_queue);
  		}
  	}
  done:
  	return;
  }
  
  /**
   * Handle fatal errors during an I/O command.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	int rd = CHANNEL_DIRECTION(ch->flags);
  
  	fsm_deltimer(&ch->timer);
  	CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  		"%s: %s: %s unrecoverable channel error",
  			CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
  
  	if (IS_MPC(ch)) {
  		priv->stats.tx_dropped++;
  		priv->stats.tx_errors++;
  	}
  	if (rd == CTCM_READ) {
  		fsm_newstate(fi, CTC_STATE_RXERR);
  		fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
  	} else {
  		fsm_newstate(fi, CTC_STATE_TXERR);
  		fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
  	}
  }
  
  /*
   * The ctcm statemachine for a channel.
   */
  const fsm_node ch_fsm[] = {
  	{ CTC_STATE_STOPPED,	CTC_EVENT_STOP,		ctcm_action_nop  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_START,	ctcm_chx_start  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_MC_FAIL,	ctcm_action_nop  },
  
  	{ CTC_STATE_NOTOP,	CTC_EVENT_STOP,		ctcm_chx_stop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_MC_FAIL,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_MC_GOOD,	ctcm_chx_start  },
  
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_FINSTAT,	ctcm_chx_setmode  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_TIMER,	ctcm_chx_setuperr  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_TIMER,	ctcm_chx_setmode  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_FINSTAT,	chx_firstio  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_TIMER,	ctcm_chx_setmode  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXINIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_FINSTAT,	chx_rxidle  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_TIMER,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_ATTNBUSY,	ctcm_chx_rxinitfail  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_ZERO,	chx_firstio  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_FINSTAT,	chx_rx  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_UC_RCRESET,	ctcm_chx_rxdisc  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_UC_ZERO,	chx_rx  },
  
  	{ CTC_STATE_TXINIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_FINSTAT,	ctcm_chx_txidle  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_TIMER,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_FINSTAT,	chx_firstio  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_UC_RCRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_UC_RSRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_TERM,	CTC_EVENT_STOP,		ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_START,	ctcm_chx_restart  },
  	{ CTC_STATE_TERM,	CTC_EVENT_FINSTAT,	ctcm_chx_stopped  },
  	{ CTC_STATE_TERM,	CTC_EVENT_UC_RCRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_UC_RSRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_DTERM,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_START,	ctcm_chx_restart  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_FINSTAT,	ctcm_chx_setmode  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_UC_RCRESET,	ctcm_action_nop  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_UC_RSRESET,	ctcm_action_nop  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_TX,		CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TX,		CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TX,		CTC_EVENT_FINSTAT,	chx_txdone  },
  	{ CTC_STATE_TX,		CTC_EVENT_UC_RCRESET,	ctcm_chx_txretry  },
  	{ CTC_STATE_TX,		CTC_EVENT_UC_RSRESET,	ctcm_chx_txretry  },
  	{ CTC_STATE_TX,		CTC_EVENT_TIMER,	ctcm_chx_txretry  },
  	{ CTC_STATE_TX,		CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TX,		CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXERR,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXERR,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXERR,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_RXERR,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  };
  
  int ch_fsm_len = ARRAY_SIZE(ch_fsm);
  
  /*
   * MPC actions for mpc channel statemachine
   * handling of MPC protocol requires extra
   * statemachine and actions which are prefixed ctcmpc_ .
   * The ctc_ch_states and ctc_ch_state_names,
   * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
   * which are expanded by some elements.
   */
  
  /*
   * Actions for mpc channel statemachine.
   */
  
  /**
   * Normal data has been send. Free the corresponding
   * skb (it's in io_queue), reset dev->tbusy and
   * revert to idle state.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
  {
  	struct channel		*ch = arg;
  	struct net_device	*dev = ch->netdev;
  	struct ctcm_priv	*priv = dev->ml_priv;
  	struct mpc_group	*grp = priv->mpcg;
  	struct sk_buff		*skb;
  	int		first = 1;
  	int		i;
  	__u32		data_space;
  	unsigned long	duration;
  	struct sk_buff	*peekskb;
  	int		rc;
  	struct th_header *header;
  	struct pdu	*p_header;
  	unsigned long done_stamp = jiffies;
  
  	CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
  			__func__, dev->name, smp_processor_id());
  
  	duration = done_stamp - ch->prof.send_stamp;
  	if (duration > ch->prof.tx_time)
  		ch->prof.tx_time = duration;
  
  	if (ch->irb->scsw.cmd.count != 0)
  		CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
  			"%s(%s): TX not complete, remaining %d bytes",
  			     CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
  	fsm_deltimer(&ch->timer);
  	while ((skb = skb_dequeue(&ch->io_queue))) {
  		priv->stats.tx_packets++;
  		priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
  		if (first) {
  			priv->stats.tx_bytes += 2;
  			first = 0;
  		}
  		refcount_dec(&skb->users);
  		dev_kfree_skb_irq(skb);
  	}
  	spin_lock(&ch->collect_lock);
  	clear_normalized_cda(&ch->ccw[4]);
  	if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
  		spin_unlock(&ch->collect_lock);
  		fsm_newstate(fi, CTC_STATE_TXIDLE);
  				goto done;
  	}
  
  	if (ctcm_checkalloc_buffer(ch)) {
  		spin_unlock(&ch->collect_lock);
  				goto done;
  	}
  	ch->trans_skb->data = ch->trans_skb_data;
  	skb_reset_tail_pointer(ch->trans_skb);
  	ch->trans_skb->len = 0;
  	if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
  		ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
  	if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
  		ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
  	i = 0;
  	p_header = NULL;
  	data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
  
  	CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
  		       " data_space:%04x\n",
  		       __func__, data_space);
  
  	while ((skb = skb_dequeue(&ch->collect_queue))) {
  		skb_put_data(ch->trans_skb, skb->data, skb->len);
  		p_header = (struct pdu *)
  			(skb_tail_pointer(ch->trans_skb) - skb->len);
  		p_header->pdu_flag = 0x00;
  		if (be16_to_cpu(skb->protocol) == ETH_P_SNAP)
  			p_header->pdu_flag |= 0x60;
  		else
  			p_header->pdu_flag |= 0x20;
  
  		CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
  				__func__, ch->trans_skb->len);
  		CTCM_PR_DBGDATA("%s: pdu header and data for up"
  				" to 32 bytes sent to vtam\n", __func__);
  		CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
  
  		ch->collect_len -= skb->len;
  		data_space -= skb->len;
  		priv->stats.tx_packets++;
  		priv->stats.tx_bytes += skb->len;
  		refcount_dec(&skb->users);
  		dev_kfree_skb_any(skb);
  		peekskb = skb_peek(&ch->collect_queue);
  		if (peekskb->len > data_space)
  			break;
  		i++;
  	}
  	/* p_header points to the last one we handled */
  	if (p_header)
  		p_header->pdu_flag |= PDU_LAST;	/*Say it's the last one*/
  
  	header = skb_push(ch->trans_skb, TH_HEADER_LENGTH);
  	memset(header, 0, TH_HEADER_LENGTH);
  
  	header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
  	ch->th_seq_num++;
  	header->th_seq_num = ch->th_seq_num;
  
  	CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
  					__func__, ch->th_seq_num);
  
  	CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
  		       __func__, ch->trans_skb->len);
  	CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
  			"data to vtam from collect_q\n", __func__);
  	CTCM_D3_DUMP((char *)ch->trans_skb->data,
  				min_t(int, ch->trans_skb->len, 50));
  
  	spin_unlock(&ch->collect_lock);
  	clear_normalized_cda(&ch->ccw[1]);
  
  	CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
  			(void *)(unsigned long)ch->ccw[1].cda,
  			ch->trans_skb->data);
  	ch->ccw[1].count = ch->max_bufsize;
  
  	if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
  		dev_kfree_skb_any(ch->trans_skb);
  		ch->trans_skb = NULL;
  		CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
  			"%s: %s: IDAL alloc failed",
  				CTCM_FUNTAIL, ch->id);
  		fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
  		return;
  	}
  
  	CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
  			(void *)(unsigned long)ch->ccw[1].cda,
  			ch->trans_skb->data);
  
  	ch->ccw[1].count = ch->trans_skb->len;
  	fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
  	ch->prof.send_stamp = jiffies;
  	if (do_debug_ccw)
  		ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
  	rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  	ch->prof.doios_multi++;
  	if (rc != 0) {
  		priv->stats.tx_dropped += i;
  		priv->stats.tx_errors += i;
  		fsm_deltimer(&ch->timer);
  		ctcm_ccw_check_rc(ch, rc, "chained TX");
  	}
  done:
  	ctcm_clear_busy(dev);
  	return;
  }
  
  /**
   * Got normal data, check for sanity, queue it up, allocate new buffer
   * trigger bottom half, and initiate next read.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
  {
  	struct channel		*ch = arg;
  	struct net_device	*dev = ch->netdev;
  	struct ctcm_priv	*priv = dev->ml_priv;
  	struct mpc_group	*grp = priv->mpcg;
  	struct sk_buff		*skb = ch->trans_skb;
  	struct sk_buff		*new_skb;
  	unsigned long		saveflags = 0;	/* avoids compiler warning */
  	int len	= ch->max_bufsize - ch->irb->scsw.cmd.count;
  
  	CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
  			CTCM_FUNTAIL, dev->name, smp_processor_id(),
  				ch->id, ch->max_bufsize, len);
  	fsm_deltimer(&ch->timer);
  
  	if (skb == NULL) {
  		CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
  			"%s(%s): TRANS_SKB = NULL",
  				CTCM_FUNTAIL, dev->name);
  			goto again;
  	}
  
  	if (len < TH_HEADER_LENGTH) {
  		CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
  				"%s(%s): packet length %d to short",
  					CTCM_FUNTAIL, dev->name, len);
  		priv->stats.rx_dropped++;
  		priv->stats.rx_length_errors++;
  	} else {
  		/* must have valid th header or game over */
  		__u32	block_len = len;
  		len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
  		new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
  
  		if (new_skb == NULL) {
  			CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
  				"%s(%d): skb allocation failed",
  						CTCM_FUNTAIL, dev->name);
  			fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
  					goto again;
  		}
  		switch (fsm_getstate(grp->fsm)) {
  		case MPCG_STATE_RESET:
  		case MPCG_STATE_INOP:
  			dev_kfree_skb_any(new_skb);
  			break;
  		case MPCG_STATE_FLOWC:
  		case MPCG_STATE_READY:
  			skb_put_data(new_skb, skb->data, block_len);
  			skb_queue_tail(&ch->io_queue, new_skb);
  			tasklet_schedule(&ch->ch_tasklet);
  			break;
  		default:
  			skb_put_data(new_skb, skb->data, len);
  			skb_queue_tail(&ch->io_queue, new_skb);
  			tasklet_hi_schedule(&ch->ch_tasklet);
  			break;
  		}
  	}
  
  again:
  	switch (fsm_getstate(grp->fsm)) {
  	int rc, dolock;
  	case MPCG_STATE_FLOWC:
  	case MPCG_STATE_READY:
  		if (ctcm_checkalloc_buffer(ch))
  			break;
  		ch->trans_skb->data = ch->trans_skb_data;
  		skb_reset_tail_pointer(ch->trans_skb);
  		ch->trans_skb->len = 0;
  		ch->ccw[1].count = ch->max_bufsize;
  			if (do_debug_ccw)
  			ctcmpc_dumpit((char *)&ch->ccw[0],
  					sizeof(struct ccw1) * 3);
  		dolock = !in_hardirq();
  		if (dolock)
  			spin_lock_irqsave(
  				get_ccwdev_lock(ch->cdev), saveflags);
  		rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  		if (dolock) /* see remark about conditional locking */
  			spin_unlock_irqrestore(
  				get_ccwdev_lock(ch->cdev), saveflags);
  		if (rc != 0)
  			ctcm_ccw_check_rc(ch, rc, "normal RX");
  		break;
  	default:
  		break;
  	}
  
  	CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
  			__func__, dev->name, ch, ch->id);
  
  }
  
  /**
   * Initialize connection by sending a __u16 of value 0.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
  {
  	struct channel		*ch = arg;
  	struct net_device	*dev = ch->netdev;
  	struct ctcm_priv	*priv = dev->ml_priv;
  	struct mpc_group	*gptr = priv->mpcg;
  
  	CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
  				__func__, ch->id, ch);
  
  	CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
  			"%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
  			CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
  			fsm_getstate(gptr->fsm), ch->protocol);
  
  	if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
  		MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
  
  	fsm_deltimer(&ch->timer);
  	if (ctcm_checkalloc_buffer(ch))
  				goto done;
  
  	switch (fsm_getstate(fi)) {
  	case CTC_STATE_STARTRETRY:
  	case CTC_STATE_SETUPWAIT:
  		if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
  			ctcmpc_chx_rxidle(fi, event, arg);
  		} else {
  			fsm_newstate(fi, CTC_STATE_TXIDLE);
  			fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
  		}
  				goto done;
  	default:
  		break;
  	}
  
  	fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
  		     ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
  
  done:
  	CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
  				__func__, ch->id, ch);
  	return;
  }
  
  /**
   * Got initial data, check it. If OK,
   * notify device statemachine that we are up and
   * running.
   *
   * fi		An instance of a channel statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from channel * upon call.
   */
  void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
  {
  	struct channel *ch = arg;
  	struct net_device *dev = ch->netdev;
  	struct ctcm_priv  *priv = dev->ml_priv;
  	struct mpc_group  *grp = priv->mpcg;
  	int rc;
  	unsigned long saveflags = 0;	/* avoids compiler warning */
  
  	fsm_deltimer(&ch->timer);
  	CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
  			__func__, ch->id, dev->name, smp_processor_id(),
  				fsm_getstate(fi), fsm_getstate(grp->fsm));
  
  	fsm_newstate(fi, CTC_STATE_RXIDLE);
  	/* XID processing complete */
  
  	switch (fsm_getstate(grp->fsm)) {
  	case MPCG_STATE_FLOWC:
  	case MPCG_STATE_READY:
  		if (ctcm_checkalloc_buffer(ch))
  				goto done;
  		ch->trans_skb->data = ch->trans_skb_data;
  		skb_reset_tail_pointer(ch->trans_skb);
  		ch->trans_skb->len = 0;
  		ch->ccw[1].count = ch->max_bufsize;
  		CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
  		if (event == CTC_EVENT_START)
  			/* see remark about conditional locking */
  			spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
  		rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0);
  		if (event == CTC_EVENT_START)
  			spin_unlock_irqrestore(
  					get_ccwdev_lock(ch->cdev), saveflags);
  		if (rc != 0) {
  			fsm_newstate(fi, CTC_STATE_RXINIT);
  			ctcm_ccw_check_rc(ch, rc, "initial RX");
  				goto done;
  		}
  		break;
  	default:
  		break;
  	}
  
  	fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
  done:
  	return;
  }
  
  /*
   * ctcmpc channel FSM action
   * called from several points in ctcmpc_ch_fsm
   * ctcmpc only
   */
  static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
  {
  	struct channel	  *ch     = arg;
  	struct net_device *dev    = ch->netdev;
  	struct ctcm_priv  *priv   = dev->ml_priv;
  	struct mpc_group  *grp = priv->mpcg;
  
  	CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
  		__func__, dev->name, ch->id, ch, smp_processor_id(),
  			fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
  
  	switch (fsm_getstate(grp->fsm)) {
  	case MPCG_STATE_XID2INITW:
  		/* ok..start yside xid exchanges */
  		if (!ch->in_mpcgroup)
  			break;
  		if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
  			fsm_deltimer(&grp->timer);
  			fsm_addtimer(&grp->timer,
  				MPC_XID_TIMEOUT_VALUE,
  				MPCG_EVENT_TIMER, dev);
  			fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
  
  		} else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
  			/* attn rcvd before xid0 processed via bh */
  			fsm_newstate(ch->fsm, CH_XID7_PENDING1);
  		break;
  	case MPCG_STATE_XID2INITX:
  	case MPCG_STATE_XID0IOWAIT:
  	case MPCG_STATE_XID0IOWAIX:
  		/* attn rcvd before xid0 processed on ch
  		but mid-xid0 processing for group    */
  		if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
  			fsm_newstate(ch->fsm, CH_XID7_PENDING1);
  		break;
  	case MPCG_STATE_XID7INITW:
  	case MPCG_STATE_XID7INITX:
  	case MPCG_STATE_XID7INITI:
  	case MPCG_STATE_XID7INITZ:
  		switch (fsm_getstate(ch->fsm)) {
  		case CH_XID7_PENDING:
  			fsm_newstate(ch->fsm, CH_XID7_PENDING1);
  			break;
  		case CH_XID7_PENDING2:
  			fsm_newstate(ch->fsm, CH_XID7_PENDING3);
  			break;
  		}
  		fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
  		break;
  	}
  
  	return;
  }
  
  /*
   * ctcmpc channel FSM action
   * called from one point in ctcmpc_ch_fsm
   * ctcmpc only
   */
  static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
  {
  	struct channel	  *ch     = arg;
  	struct net_device *dev    = ch->netdev;
  	struct ctcm_priv  *priv   = dev->ml_priv;
  	struct mpc_group  *grp    = priv->mpcg;
  
  	CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
  			__func__, dev->name, ch->id,
  			fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
  
  	fsm_deltimer(&ch->timer);
  
  	switch (fsm_getstate(grp->fsm)) {
  	case MPCG_STATE_XID0IOWAIT:
  		/* vtam wants to be primary.start yside xid exchanges*/
  		/* only receive one attn-busy at a time so must not  */
  		/* change state each time			     */
  		grp->changed_side = 1;
  		fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
  		break;
  	case MPCG_STATE_XID2INITW:
  		if (grp->changed_side == 1) {
  			grp->changed_side = 2;
  			break;
  		}
  		/* process began via call to establish_conn	 */
  		/* so must report failure instead of reverting	 */
  		/* back to ready-for-xid passive state		 */
  		if (grp->estconnfunc)
  				goto done;
  		/* this attnbusy is NOT the result of xside xid  */
  		/* collisions so yside must have been triggered  */
  		/* by an ATTN that was not intended to start XID */
  		/* processing. Revert back to ready-for-xid and  */
  		/* wait for ATTN interrupt to signal xid start	 */
  		if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
  			fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
  			fsm_deltimer(&grp->timer);
  				goto done;
  		}
  		fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
  				goto done;
  	case MPCG_STATE_XID2INITX:
  		/* XID2 was received before ATTN Busy for second
  		   channel.Send yside xid for second channel.
  		*/
  		if (grp->changed_side == 1) {
  			grp->changed_side = 2;
  			break;
  		}
  		fallthrough;
  	case MPCG_STATE_XID0IOWAIX:
  	case MPCG_STATE_XID7INITW:
  	case MPCG_STATE_XID7INITX:
  	case MPCG_STATE_XID7INITI:
  	case MPCG_STATE_XID7INITZ:
  	default:
  		/* multiple attn-busy indicates too out-of-sync      */
  		/* and they are certainly not being received as part */
  		/* of valid mpc group negotiations..		     */
  		fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
  				goto done;
  	}
  
  	if (grp->changed_side == 1) {
  		fsm_deltimer(&grp->timer);
  		fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
  			     MPCG_EVENT_TIMER, dev);
  	}
  	if (ch->in_mpcgroup)
  		fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
  	else
  		CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
  			"%s(%s): channel %s not added to group",
  				CTCM_FUNTAIL, dev->name, ch->id);
  
  done:
  	return;
  }
  
  /*
   * ctcmpc channel FSM action
   * called from several points in ctcmpc_ch_fsm
   * ctcmpc only
   */
  static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
  {
  	struct channel	   *ch	   = arg;
  	struct net_device  *dev    = ch->netdev;
  	struct ctcm_priv   *priv   = dev->ml_priv;
  	struct mpc_group   *grp    = priv->mpcg;
  
  	fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
  	return;
  }
  
  /*
   * ctcmpc channel FSM action
   * called from several points in ctcmpc_ch_fsm
   * ctcmpc only
   */
  static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
  {
  	struct channel *ach = arg;
  	struct net_device *dev = ach->netdev;
  	struct ctcm_priv *priv = dev->ml_priv;
  	struct mpc_group *grp = priv->mpcg;
  	struct channel *wch = priv->channel[CTCM_WRITE];
  	struct channel *rch = priv->channel[CTCM_READ];
  	struct sk_buff *skb;
  	struct th_sweep *header;
  	int rc = 0;
  	unsigned long saveflags = 0;
  
  	CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
  			__func__, smp_processor_id(), ach, ach->id);
  
  	if (grp->in_sweep == 0)
  				goto done;
  
  	CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
  				__func__, wch->th_seq_num);
  	CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
  				__func__, rch->th_seq_num);
  
  	if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
  		/* give the previous IO time to complete */
  		fsm_addtimer(&wch->sweep_timer,
  			200, CTC_EVENT_RSWEEP_TIMER, wch);
  				goto done;
  	}
  
  	skb = skb_dequeue(&wch->sweep_queue);
  	if (!skb)
  				goto done;
  
  	if (set_normalized_cda(&wch->ccw[4], skb->data)) {
  		grp->in_sweep = 0;
  		ctcm_clear_busy_do(dev);
  		dev_kfree_skb_any(skb);
  		fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
  				goto done;
  	} else {
  		refcount_inc(&skb->users);
  		skb_queue_tail(&wch->io_queue, skb);
  	}
  
  	/* send out the sweep */
  	wch->ccw[4].count = skb->len;
  
  	header = (struct th_sweep *)skb->data;
  	switch (header->th.th_ch_flag) {
  	case TH_SWEEP_REQ:
  		grp->sweep_req_pend_num--;
  		break;
  	case TH_SWEEP_RESP:
  		grp->sweep_rsp_pend_num--;
  		break;
  	}
  
  	header->sw.th_last_seq = wch->th_seq_num;
  
  	CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
  	CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
  	CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
  
  	fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
  	fsm_newstate(wch->fsm, CTC_STATE_TX);
  
  	spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
  	wch->prof.send_stamp = jiffies;
  	rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0);
  	spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
  
  	if ((grp->sweep_req_pend_num == 0) &&
  	   (grp->sweep_rsp_pend_num == 0)) {
  		grp->in_sweep = 0;
  		rch->th_seq_num = 0x00;
  		wch->th_seq_num = 0x00;
  		ctcm_clear_busy_do(dev);
  	}
  
  	CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
  			__func__, wch->th_seq_num, rch->th_seq_num);
  
  	if (rc != 0)
  		ctcm_ccw_check_rc(wch, rc, "send sweep");
  
  done:
  	return;
  }
  
  
  /*
   * The ctcmpc statemachine for a channel.
   */
  
  const fsm_node ctcmpc_ch_fsm[] = {
  	{ CTC_STATE_STOPPED,	CTC_EVENT_STOP,		ctcm_action_nop  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_START,	ctcm_chx_start  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CTC_STATE_STOPPED,	CTC_EVENT_MC_FAIL,	ctcm_action_nop  },
  
  	{ CTC_STATE_NOTOP,	CTC_EVENT_STOP,		ctcm_chx_stop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_MC_FAIL,	ctcm_action_nop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_MC_GOOD,	ctcm_chx_start  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_UC_RCRESET,	ctcm_chx_stop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_UC_RSRESET,	ctcm_chx_stop  },
  	{ CTC_STATE_NOTOP,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_FINSTAT,	ctcm_chx_setmode  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_TIMER,	ctcm_chx_setuperr  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_STARTWAIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_TIMER,	ctcm_chx_setmode  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_FINSTAT,	ctcm_chx_setmode  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_STARTRETRY,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_FINSTAT,	ctcmpc_chx_firstio  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_TIMER,	ctcm_chx_setmode  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_SETUPWAIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXINIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rxidle  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_TIMER,	ctcm_chx_rxiniterr  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_ATTNBUSY,	ctcm_chx_rxinitfail  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_firstio  },
  	{ CTC_STATE_RXINIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  
  	{ CH_XID0_PENDING,	CTC_EVENT_FINSTAT,	ctcm_action_nop  },
  	{ CH_XID0_PENDING,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID0_PENDING,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID0_PENDING,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID0_PENDING,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID0_PENDING,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID0_PENDING,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID0_PENDING,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID0_PENDING,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID0_PENDING,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_ATTNBUSY,	ctcmpc_chx_attnbusy  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID0_INPROGRESS,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CH_XID7_PENDING,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID7_PENDING,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID7_PENDING,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID7_PENDING,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID7_PENDING,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID7_PENDING,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CH_XID7_PENDING1,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID7_PENDING1,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CH_XID7_PENDING2,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID7_PENDING2,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CH_XID7_PENDING3,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID7_PENDING3,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CH_XID7_PENDING4,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_ATTN,		ctcmpc_chx_attn  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_UC_RCRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_UC_RSRESET,	ctcm_chx_setuperr  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_ATTNBUSY,	ctcm_chx_iofatal  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_TIMER,	ctcmpc_chx_resend  },
  	{ CH_XID7_PENDING4,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_FINSTAT,	ctcmpc_chx_rx  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_UC_RCRESET,	ctcm_chx_rxdisc  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_UC_RSRESET,	ctcm_chx_fail  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_RXIDLE,	CTC_EVENT_UC_ZERO,	ctcmpc_chx_rx  },
  
  	{ CTC_STATE_TXINIT,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_FINSTAT,	ctcm_chx_txidle  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_UC_RCRESET,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_UC_RSRESET,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_TIMER,	ctcm_chx_txiniterr  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_TXINIT,	CTC_EVENT_RSWEEP_TIMER,	ctcmpc_chx_send_sweep },
  
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_FINSTAT,	ctcmpc_chx_firstio  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_UC_RCRESET,	ctcm_chx_fail  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_UC_RSRESET,	ctcm_chx_fail  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_TXIDLE,	CTC_EVENT_RSWEEP_TIMER,	ctcmpc_chx_send_sweep },
  
  	{ CTC_STATE_TERM,	CTC_EVENT_STOP,		ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_START,	ctcm_chx_restart  },
  	{ CTC_STATE_TERM,	CTC_EVENT_FINSTAT,	ctcm_chx_stopped  },
  	{ CTC_STATE_TERM,	CTC_EVENT_UC_RCRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_UC_RSRESET,	ctcm_action_nop  },
  	{ CTC_STATE_TERM,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_TERM,	CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  	{ CTC_STATE_TERM,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  
  	{ CTC_STATE_DTERM,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_START,	ctcm_chx_restart  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_FINSTAT,	ctcm_chx_setmode  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_UC_RCRESET,	ctcm_action_nop  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_UC_RSRESET,	ctcm_action_nop  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_DTERM,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  
  	{ CTC_STATE_TX,		CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TX,		CTC_EVENT_START,	ctcm_action_nop  },
  	{ CTC_STATE_TX,		CTC_EVENT_FINSTAT,	ctcmpc_chx_txdone  },
  	{ CTC_STATE_TX,		CTC_EVENT_UC_RCRESET,	ctcm_chx_fail  },
  	{ CTC_STATE_TX,		CTC_EVENT_UC_RSRESET,	ctcm_chx_fail  },
  	{ CTC_STATE_TX,		CTC_EVENT_TIMER,	ctcm_chx_txretry  },
  	{ CTC_STATE_TX,		CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TX,		CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_TX,		CTC_EVENT_RSWEEP_TIMER,	ctcmpc_chx_send_sweep },
  	{ CTC_STATE_TX,		CTC_EVENT_IO_EBUSY,	ctcm_chx_fail  },
  
  	{ CTC_STATE_RXERR,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXERR,	CTC_EVENT_STOP,		ctcm_chx_haltio  },
  	{ CTC_STATE_TXERR,	CTC_EVENT_IO_ENODEV,	ctcm_chx_iofatal  },
  	{ CTC_STATE_TXERR,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  	{ CTC_STATE_RXERR,	CTC_EVENT_MC_FAIL,	ctcm_chx_fail  },
  };
  
  int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
  
  /*
   * Actions for interface - statemachine.
   */
  
  /**
   * Startup channels by sending CTC_EVENT_START to each channel.
   *
   * fi		An instance of an interface statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from struct net_device * upon call.
   */
  static void dev_action_start(fsm_instance *fi, int event, void *arg)
  {
  	struct net_device *dev = arg;
  	struct ctcm_priv *priv = dev->ml_priv;
  	int direction;
  
  	CTCMY_DBF_DEV_NAME(SETUP, dev, "");
  
  	fsm_deltimer(&priv->restart_timer);
  	fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
  	if (IS_MPC(priv))
  		priv->mpcg->channels_terminating = 0;
  	for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
  		struct channel *ch = priv->channel[direction];
  		fsm_event(ch->fsm, CTC_EVENT_START, ch);
  	}
  }
  
  /**
   * Shutdown channels by sending CTC_EVENT_STOP to each channel.
   *
   * fi		An instance of an interface statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from struct net_device * upon call.
   */
  static void dev_action_stop(fsm_instance *fi, int event, void *arg)
  {
  	int direction;
  	struct net_device *dev = arg;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCMY_DBF_DEV_NAME(SETUP, dev, "");
  
  	fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
  	for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
  		struct channel *ch = priv->channel[direction];
  		fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
  		ch->th_seq_num = 0x00;
  		CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
  				__func__, ch->th_seq_num);
  	}
  	if (IS_MPC(priv))
  		fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
  }
  
  static void dev_action_restart(fsm_instance *fi, int event, void *arg)
  {
  	int restart_timer;
  	struct net_device *dev = arg;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCMY_DBF_DEV_NAME(TRACE, dev, "");
  
  	if (IS_MPC(priv)) {
  		restart_timer = CTCM_TIME_1_SEC;
  	} else {
  		restart_timer = CTCM_TIME_5_SEC;
  	}
  	dev_info(&dev->dev, "Restarting device\n");
  
  	dev_action_stop(fi, event, arg);
  	fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
  	if (IS_MPC(priv))
  		fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
  
  	/* going back into start sequence too quickly can	  */
  	/* result in the other side becoming unreachable   due	  */
  	/* to sense reported when IO is aborted			  */
  	fsm_addtimer(&priv->restart_timer, restart_timer,
  			DEV_EVENT_START, dev);
  }
  
  /**
   * Called from channel statemachine
   * when a channel is up and running.
   *
   * fi		An instance of an interface statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from struct net_device * upon call.
   */
  static void dev_action_chup(fsm_instance *fi, int event, void *arg)
  {
  	struct net_device *dev = arg;
  	struct ctcm_priv *priv = dev->ml_priv;
  	int dev_stat = fsm_getstate(fi);
  
  	CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
  			"%s(%s): priv = %p [%d,%d]\n ",	CTCM_FUNTAIL,
  				dev->name, dev->ml_priv, dev_stat, event);
  
  	switch (fsm_getstate(fi)) {
  	case DEV_STATE_STARTWAIT_RXTX:
  		if (event == DEV_EVENT_RXUP)
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
  		else
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
  		break;
  	case DEV_STATE_STARTWAIT_RX:
  		if (event == DEV_EVENT_RXUP) {
  			fsm_newstate(fi, DEV_STATE_RUNNING);
  			dev_info(&dev->dev,
  				"Connected with remote side\n");
  			ctcm_clear_busy(dev);
  		}
  		break;
  	case DEV_STATE_STARTWAIT_TX:
  		if (event == DEV_EVENT_TXUP) {
  			fsm_newstate(fi, DEV_STATE_RUNNING);
  			dev_info(&dev->dev,
  				"Connected with remote side\n");
  			ctcm_clear_busy(dev);
  		}
  		break;
  	case DEV_STATE_STOPWAIT_TX:
  		if (event == DEV_EVENT_RXUP)
  			fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
  		break;
  	case DEV_STATE_STOPWAIT_RX:
  		if (event == DEV_EVENT_TXUP)
  			fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
  		break;
  	}
  
  	if (IS_MPC(priv)) {
  		if (event == DEV_EVENT_RXUP)
  			mpc_channel_action(priv->channel[CTCM_READ],
  				CTCM_READ, MPC_CHANNEL_ADD);
  		else
  			mpc_channel_action(priv->channel[CTCM_WRITE],
  				CTCM_WRITE, MPC_CHANNEL_ADD);
  	}
  }
  
  /**
   * Called from device statemachine
   * when a channel has been shutdown.
   *
   * fi		An instance of an interface statemachine.
   * event	The event, just happened.
   * arg		Generic pointer, casted from struct net_device * upon call.
   */
  static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
  {
  
  	struct net_device *dev = arg;
  	struct ctcm_priv *priv = dev->ml_priv;
  
  	CTCMY_DBF_DEV_NAME(SETUP, dev, "");
  
  	switch (fsm_getstate(fi)) {
  	case DEV_STATE_RUNNING:
  		if (event == DEV_EVENT_TXDOWN)
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
  		else
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
  		break;
  	case DEV_STATE_STARTWAIT_RX:
  		if (event == DEV_EVENT_TXDOWN)
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
  		break;
  	case DEV_STATE_STARTWAIT_TX:
  		if (event == DEV_EVENT_RXDOWN)
  			fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
  		break;
  	case DEV_STATE_STOPWAIT_RXTX:
  		if (event == DEV_EVENT_TXDOWN)
  			fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
  		else
  			fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
  		break;
  	case DEV_STATE_STOPWAIT_RX:
  		if (event == DEV_EVENT_RXDOWN)
  			fsm_newstate(fi, DEV_STATE_STOPPED);
  		break;
  	case DEV_STATE_STOPWAIT_TX:
  		if (event == DEV_EVENT_TXDOWN)
  			fsm_newstate(fi, DEV_STATE_STOPPED);
  		break;
  	}
  	if (IS_MPC(priv)) {
  		if (event == DEV_EVENT_RXDOWN)
  			mpc_channel_action(priv->channel[CTCM_READ],
  				CTCM_READ, MPC_CHANNEL_REMOVE);
  		else
  			mpc_channel_action(priv->channel[CTCM_WRITE],
  				CTCM_WRITE, MPC_CHANNEL_REMOVE);
  	}
  }
  
  const fsm_node dev_fsm[] = {
  	{ DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
  	{ DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
  	{ DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
  	{ DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
  	{ DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
  	{ DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
  	{ DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
  	{ DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
  	{ DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
  	{ DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
  	{ DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
  	{ DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
  	{ DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
  };
  
  int dev_fsm_len = ARRAY_SIZE(dev_fsm);
  
  /* --- This is the END my friend --- */
  
  