drivers/s390/net/ctcm_fsms.c

   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  */
 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
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
 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  */
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  */
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  */
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  */
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  */
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  */
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  */
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                 /* Else, fall through */
1708         case MPCG_STATE_XID0IOWAIX:
1709         case MPCG_STATE_XID7INITW:
1710         case MPCG_STATE_XID7INITX:
1711         case MPCG_STATE_XID7INITI:
1712         case MPCG_STATE_XID7INITZ:
1713         default:
1714                 /* multiple attn-busy indicates too out-of-sync      */
1715                 /* and they are certainly not being received as part */
1716                 /* of valid mpc group negotiations..                 */
1717                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1718                                 goto done;
1719         }
1720
1721         if (grp->changed_side == 1) {
1722                 fsm_deltimer(&grp->timer);
1723                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1724                              MPCG_EVENT_TIMER, dev);
1725         }
1726         if (ch->in_mpcgroup)
1727                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1728         else
1729                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1730                         "%s(%s): channel %s not added to group",
1731                                 CTCM_FUNTAIL, dev->name, ch->id);
1732
1733 done:
1734         return;
1735 }
1736
1737 /*
1738  * ctcmpc channel FSM action
1739  * called from several points in ctcmpc_ch_fsm
1740  * ctcmpc only
1741  */
1742 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1743 {
1744         struct channel     *ch     = arg;
1745         struct net_device  *dev    = ch->netdev;
1746         struct ctcm_priv   *priv   = dev->ml_priv;
1747         struct mpc_group   *grp    = priv->mpcg;
1748
1749         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1750         return;
1751 }
1752
1753 /*
1754  * ctcmpc channel FSM action
1755  * called from several points in ctcmpc_ch_fsm
1756  * ctcmpc only
1757  */
1758 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1759 {
1760         struct channel *ach = arg;
1761         struct net_device *dev = ach->netdev;
1762         struct ctcm_priv *priv = dev->ml_priv;
1763         struct mpc_group *grp = priv->mpcg;
1764         struct channel *wch = priv->channel[CTCM_WRITE];
1765         struct channel *rch = priv->channel[CTCM_READ];
1766         struct sk_buff *skb;
1767         struct th_sweep *header;
1768         int rc = 0;
1769         unsigned long saveflags = 0;
1770
1771         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1772                         __func__, smp_processor_id(), ach, ach->id);
1773
1774         if (grp->in_sweep == 0)
1775                                 goto done;
1776
1777         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1778                                 __func__, wch->th_seq_num);
1779         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1780                                 __func__, rch->th_seq_num);
1781
1782         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1783                 /* give the previous IO time to complete */
1784                 fsm_addtimer(&wch->sweep_timer,
1785                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1786                                 goto done;
1787         }
1788
1789         skb = skb_dequeue(&wch->sweep_queue);
1790         if (!skb)
1791                                 goto done;
1792
1793         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1794                 grp->in_sweep = 0;
1795                 ctcm_clear_busy_do(dev);
1796                 dev_kfree_skb_any(skb);
1797                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1798                                 goto done;
1799         } else {
1800                 refcount_inc(&skb->users);
1801                 skb_queue_tail(&wch->io_queue, skb);
1802         }
1803
1804         /* send out the sweep */
1805         wch->ccw[4].count = skb->len;
1806
1807         header = (struct th_sweep *)skb->data;
1808         switch (header->th.th_ch_flag) {
1809         case TH_SWEEP_REQ:
1810                 grp->sweep_req_pend_num--;
1811                 break;
1812         case TH_SWEEP_RESP:
1813                 grp->sweep_rsp_pend_num--;
1814                 break;
1815         }
1816
1817         header->sw.th_last_seq = wch->th_seq_num;
1818
1819         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1820         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1821         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1822
1823         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1824         fsm_newstate(wch->fsm, CTC_STATE_TX);
1825
1826         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1827         wch->prof.send_stamp = jiffies;
1828         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1829                                         (unsigned long) wch, 0xff, 0);
1830         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1831
1832         if ((grp->sweep_req_pend_num == 0) &&
1833            (grp->sweep_rsp_pend_num == 0)) {
1834                 grp->in_sweep = 0;
1835                 rch->th_seq_num = 0x00;
1836                 wch->th_seq_num = 0x00;
1837                 ctcm_clear_busy_do(dev);
1838         }
1839
1840         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1841                         __func__, wch->th_seq_num, rch->th_seq_num);
1842
1843         if (rc != 0)
1844                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1845
1846 done:
1847         return;
1848 }
1849
1850
1851 /*
1852  * The ctcmpc statemachine for a channel.
1853  */
1854
1855 const fsm_node ctcmpc_ch_fsm[] = {
1856         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1857         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1858         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1859         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1860         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1861
1862         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1863         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1864         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1865         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1866         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1867         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1868         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1869         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1870
1871         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1872         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1873         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1874         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1875         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1876         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1877
1878         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1879         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1880         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1881         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1882         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1883
1884         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1885         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1886         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1887         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1888         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1889         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1890         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1891         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1892
1893         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1894         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1895         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1896         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1897         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1898         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1899         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1900         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1901         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1902         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1903
1904         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1905         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1906         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1907         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1908         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1909         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1910         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1911         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1912         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1913         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1914
1915         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1916         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1917         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1918         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1919         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1920         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1921         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1922         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1923         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1924         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1925         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1926
1927         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1928         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1929         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1930         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1931         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1932         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1933         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1934         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1935         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1936         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1937         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1938         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1939         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1940
1941         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1942         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1943         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1944         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1945         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1946         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1947         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1948         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1949         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1950         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1951         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1952         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1953
1954         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1955         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1956         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1957         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1958         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1959         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1960         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1961         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1962         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1963         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1964         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1965         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1966
1967         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1968         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1969         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1970         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1971         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1972         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1973         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1974         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1975         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1976         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1977         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1978         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1979
1980         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1981         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1982         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1983         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1984         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1985         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1986         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1987         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1988         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1989         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1990         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1991         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1992
1993         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1994         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1995         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1996         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1997         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
1998         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1999         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2000         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
2001
2002         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2003         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
2004         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
2005         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
2006         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
2007         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2008         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2009         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2010         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2011
2012         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2013         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2014         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2015         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2016         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2017         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2018         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2019         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2020
2021         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2022         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2023         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2024         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2025         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2026         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2027         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2028         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2029
2030         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2031         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2032         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2033         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2034         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2035         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2036         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2037
2038         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2039         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2040         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2041         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2042         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2043         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2044         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2045         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2046         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2047         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2048
2049         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2050         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2051         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2052         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2053         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2054 };
2055
2056 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2057
2058 /*
2059  * Actions for interface - statemachine.
2060  */
2061
2062 /**
2063  * Startup channels by sending CTC_EVENT_START to each channel.
2064  *
2065  * fi           An instance of an interface statemachine.
2066  * event        The event, just happened.
2067  * arg          Generic pointer, casted from struct net_device * upon call.
2068  */
2069 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2070 {
2071         struct net_device *dev = arg;
2072         struct ctcm_priv *priv = dev->ml_priv;
2073         int direction;
2074
2075         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2076
2077         fsm_deltimer(&priv->restart_timer);
2078         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2079         if (IS_MPC(priv))
2080                 priv->mpcg->channels_terminating = 0;
2081         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2082                 struct channel *ch = priv->channel[direction];
2083                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2084         }
2085 }
2086
2087 /**
2088  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2089  *
2090  * fi           An instance of an interface statemachine.
2091  * event        The event, just happened.
2092  * arg          Generic pointer, casted from struct net_device * upon call.
2093  */
2094 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2095 {
2096         int direction;
2097         struct net_device *dev = arg;
2098         struct ctcm_priv *priv = dev->ml_priv;
2099
2100         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2101
2102         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2103         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2104                 struct channel *ch = priv->channel[direction];
2105                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2106                 ch->th_seq_num = 0x00;
2107                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2108                                 __func__, ch->th_seq_num);
2109         }
2110         if (IS_MPC(priv))
2111                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2112 }
2113
2114 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2115 {
2116         int restart_timer;
2117         struct net_device *dev = arg;
2118         struct ctcm_priv *priv = dev->ml_priv;
2119
2120         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2121
2122         if (IS_MPC(priv)) {
2123                 restart_timer = CTCM_TIME_1_SEC;
2124         } else {
2125                 restart_timer = CTCM_TIME_5_SEC;
2126         }
2127         dev_info(&dev->dev, "Restarting device\n");
2128
2129         dev_action_stop(fi, event, arg);
2130         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2131         if (IS_MPC(priv))
2132                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2133
2134         /* going back into start sequence too quickly can         */
2135         /* result in the other side becoming unreachable   due    */
2136         /* to sense reported when IO is aborted                   */
2137         fsm_addtimer(&priv->restart_timer, restart_timer,
2138                         DEV_EVENT_START, dev);
2139 }
2140
2141 /**
2142  * Called from channel statemachine
2143  * when a channel is up and running.
2144  *
2145  * fi           An instance of an interface statemachine.
2146  * event        The event, just happened.
2147  * arg          Generic pointer, casted from struct net_device * upon call.
2148  */
2149 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2150 {
2151         struct net_device *dev = arg;
2152         struct ctcm_priv *priv = dev->ml_priv;
2153         int dev_stat = fsm_getstate(fi);
2154
2155         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2156                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2157                                 dev->name, dev->ml_priv, dev_stat, event);
2158
2159         switch (fsm_getstate(fi)) {
2160         case DEV_STATE_STARTWAIT_RXTX:
2161                 if (event == DEV_EVENT_RXUP)
2162                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2163                 else
2164                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2165                 break;
2166         case DEV_STATE_STARTWAIT_RX:
2167                 if (event == DEV_EVENT_RXUP) {
2168                         fsm_newstate(fi, DEV_STATE_RUNNING);
2169                         dev_info(&dev->dev,
2170                                 "Connected with remote side\n");
2171                         ctcm_clear_busy(dev);
2172                 }
2173                 break;
2174         case DEV_STATE_STARTWAIT_TX:
2175                 if (event == DEV_EVENT_TXUP) {
2176                         fsm_newstate(fi, DEV_STATE_RUNNING);
2177                         dev_info(&dev->dev,
2178                                 "Connected with remote side\n");
2179                         ctcm_clear_busy(dev);
2180                 }
2181                 break;
2182         case DEV_STATE_STOPWAIT_TX:
2183                 if (event == DEV_EVENT_RXUP)
2184                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2185                 break;
2186         case DEV_STATE_STOPWAIT_RX:
2187                 if (event == DEV_EVENT_TXUP)
2188                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2189                 break;
2190         }
2191
2192         if (IS_MPC(priv)) {
2193                 if (event == DEV_EVENT_RXUP)
2194                         mpc_channel_action(priv->channel[CTCM_READ],
2195                                 CTCM_READ, MPC_CHANNEL_ADD);
2196                 else
2197                         mpc_channel_action(priv->channel[CTCM_WRITE],
2198                                 CTCM_WRITE, MPC_CHANNEL_ADD);
2199         }
2200 }
2201
2202 /**
2203  * Called from device statemachine
2204  * when a channel has been shutdown.
2205  *
2206  * fi           An instance of an interface statemachine.
2207  * event        The event, just happened.
2208  * arg          Generic pointer, casted from struct net_device * upon call.
2209  */
2210 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2211 {
2212
2213         struct net_device *dev = arg;
2214         struct ctcm_priv *priv = dev->ml_priv;
2215
2216         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2217
2218         switch (fsm_getstate(fi)) {
2219         case DEV_STATE_RUNNING:
2220                 if (event == DEV_EVENT_TXDOWN)
2221                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2222                 else
2223                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2224                 break;
2225         case DEV_STATE_STARTWAIT_RX:
2226                 if (event == DEV_EVENT_TXDOWN)
2227                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2228                 break;
2229         case DEV_STATE_STARTWAIT_TX:
2230                 if (event == DEV_EVENT_RXDOWN)
2231                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2232                 break;
2233         case DEV_STATE_STOPWAIT_RXTX:
2234                 if (event == DEV_EVENT_TXDOWN)
2235                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2236                 else
2237                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2238                 break;
2239         case DEV_STATE_STOPWAIT_RX:
2240                 if (event == DEV_EVENT_RXDOWN)
2241                         fsm_newstate(fi, DEV_STATE_STOPPED);
2242                 break;
2243         case DEV_STATE_STOPWAIT_TX:
2244                 if (event == DEV_EVENT_TXDOWN)
2245                         fsm_newstate(fi, DEV_STATE_STOPPED);
2246                 break;
2247         }
2248         if (IS_MPC(priv)) {
2249                 if (event == DEV_EVENT_RXDOWN)
2250                         mpc_channel_action(priv->channel[CTCM_READ],
2251                                 CTCM_READ, MPC_CHANNEL_REMOVE);
2252                 else
2253                         mpc_channel_action(priv->channel[CTCM_WRITE],
2254                                 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2255         }
2256 }
2257
2258 const fsm_node dev_fsm[] = {
2259         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2260         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2261         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2262         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2263         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2264         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2265         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2266         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2267         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2268         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2269         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2270         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2271         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2272         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2273         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2274         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2275         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2276         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2277         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2278         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2279         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2280         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2281         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2282         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2283         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2284         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2285         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2286         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2287         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2288         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2289         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2290         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2291         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2292         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2293         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2294         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2295         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2296 };
2297
2298 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2299
2300 /* --- This is the END my friend --- */
2301