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   1 /*
   2  * drivers/s390/net/ctcm_fsms.c
   3  *
   4  * Copyright IBM Corp. 2001, 2007
   5  * Authors:     Fritz Elfert (felfert@millenux.com)
   6  *              Peter Tiedemann (ptiedem@de.ibm.com)
   7  *      MPC additions :
   8  *              Belinda Thompson (belindat@us.ibm.com)
   9  *              Andy Richter (richtera@us.ibm.com)
  10  */
  11
  12 #undef DEBUG
  13 #undef DEBUGDATA
  14 #undef DEBUGCCW
  15
  16 #define KMSG_COMPONENT "ctcm"
  17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/timer.h>
  27 #include <linux/bitops.h>
  28
  29 #include <linux/signal.h>
  30 #include <linux/string.h>
  31
  32 #include <linux/ip.h>
  33 #include <linux/if_arp.h>
  34 #include <linux/tcp.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/ctype.h>
  37 #include <net/dst.h>
  38
  39 #include <linux/io.h>
  40 #include <asm/ccwdev.h>
  41 #include <asm/ccwgroup.h>
  42 #include <linux/uaccess.h>
  43
  44 #include <asm/idals.h>
  45
  46 #include "fsm.h"
  47 #include "cu3088.h"
  48
  49 #include "ctcm_dbug.h"
  50 #include "ctcm_main.h"
  51 #include "ctcm_fsms.h"
  52
  53 const char *dev_state_names[] = {
  54         [DEV_STATE_STOPPED]             = "Stopped",
  55         [DEV_STATE_STARTWAIT_RXTX]      = "StartWait RXTX",
  56         [DEV_STATE_STARTWAIT_RX]        = "StartWait RX",
  57         [DEV_STATE_STARTWAIT_TX]        = "StartWait TX",
  58         [DEV_STATE_STOPWAIT_RXTX]       = "StopWait RXTX",
  59         [DEV_STATE_STOPWAIT_RX]         = "StopWait RX",
  60         [DEV_STATE_STOPWAIT_TX]         = "StopWait TX",
  61         [DEV_STATE_RUNNING]             = "Running",
  62 };
  63
  64 const char *dev_event_names[] = {
  65         [DEV_EVENT_START]       = "Start",
  66         [DEV_EVENT_STOP]        = "Stop",
  67         [DEV_EVENT_RXUP]        = "RX up",
  68         [DEV_EVENT_TXUP]        = "TX up",
  69         [DEV_EVENT_RXDOWN]      = "RX down",
  70         [DEV_EVENT_TXDOWN]      = "TX down",
  71         [DEV_EVENT_RESTART]     = "Restart",
  72 };
  73
  74 const char *ctc_ch_event_names[] = {
  75         [CTC_EVENT_IO_SUCCESS]  = "ccw_device success",
  76         [CTC_EVENT_IO_EBUSY]    = "ccw_device busy",
  77         [CTC_EVENT_IO_ENODEV]   = "ccw_device enodev",
  78         [CTC_EVENT_IO_UNKNOWN]  = "ccw_device unknown",
  79         [CTC_EVENT_ATTNBUSY]    = "Status ATTN & BUSY",
  80         [CTC_EVENT_ATTN]        = "Status ATTN",
  81         [CTC_EVENT_BUSY]        = "Status BUSY",
  82         [CTC_EVENT_UC_RCRESET]  = "Unit check remote reset",
  83         [CTC_EVENT_UC_RSRESET]  = "Unit check remote system reset",
  84         [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
  85         [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
  86         [CTC_EVENT_UC_HWFAIL]   = "Unit check Hardware failure",
  87         [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
  88         [CTC_EVENT_UC_ZERO]     = "Unit check ZERO",
  89         [CTC_EVENT_UC_UNKNOWN]  = "Unit check Unknown",
  90         [CTC_EVENT_SC_UNKNOWN]  = "SubChannel check Unknown",
  91         [CTC_EVENT_MC_FAIL]     = "Machine check failure",
  92         [CTC_EVENT_MC_GOOD]     = "Machine check operational",
  93         [CTC_EVENT_IRQ]         = "IRQ normal",
  94         [CTC_EVENT_FINSTAT]     = "IRQ final",
  95         [CTC_EVENT_TIMER]       = "Timer",
  96         [CTC_EVENT_START]       = "Start",
  97         [CTC_EVENT_STOP]        = "Stop",
  98         /*
  99         * additional MPC events
 100         */
 101         [CTC_EVENT_SEND_XID]    = "XID Exchange",
 102         [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
 103 };
 104
 105 const char *ctc_ch_state_names[] = {
 106         [CTC_STATE_IDLE]        = "Idle",
 107         [CTC_STATE_STOPPED]     = "Stopped",
 108         [CTC_STATE_STARTWAIT]   = "StartWait",
 109         [CTC_STATE_STARTRETRY]  = "StartRetry",
 110         [CTC_STATE_SETUPWAIT]   = "SetupWait",
 111         [CTC_STATE_RXINIT]      = "RX init",
 112         [CTC_STATE_TXINIT]      = "TX init",
 113         [CTC_STATE_RX]          = "RX",
 114         [CTC_STATE_TX]          = "TX",
 115         [CTC_STATE_RXIDLE]      = "RX idle",
 116         [CTC_STATE_TXIDLE]      = "TX idle",
 117         [CTC_STATE_RXERR]       = "RX error",
 118         [CTC_STATE_TXERR]       = "TX error",
 119         [CTC_STATE_TERM]        = "Terminating",
 120         [CTC_STATE_DTERM]       = "Restarting",
 121         [CTC_STATE_NOTOP]       = "Not operational",
 122         /*
 123         * additional MPC states
 124         */
 125         [CH_XID0_PENDING]       = "Pending XID0 Start",
 126         [CH_XID0_INPROGRESS]    = "In XID0 Negotiations ",
 127         [CH_XID7_PENDING]       = "Pending XID7 P1 Start",
 128         [CH_XID7_PENDING1]      = "Active XID7 P1 Exchange ",
 129         [CH_XID7_PENDING2]      = "Pending XID7 P2 Start ",
 130         [CH_XID7_PENDING3]      = "Active XID7 P2 Exchange ",
 131         [CH_XID7_PENDING4]      = "XID7 Complete - Pending READY ",
 132 };
 133
 134 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
 135
 136 /*
 137  * ----- static ctcm actions for channel statemachine -----
 138  *
 139 */
 140 static void chx_txdone(fsm_instance *fi, int event, void *arg);
 141 static void chx_rx(fsm_instance *fi, int event, void *arg);
 142 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
 143 static void chx_firstio(fsm_instance *fi, int event, void *arg);
 144 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
 145 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
 146 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
 147 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
 148 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
 149 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
 150 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
 151 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
 152 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
 153 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
 154 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
 155 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
 156 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
 157 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
 158
 159 /*
 160  * ----- static ctcmpc actions for ctcmpc channel statemachine -----
 161  *
 162 */
 163 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
 164 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
 165 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
 166 /* shared :
 167 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
 168 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
 169 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
 170 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
 171 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
 172 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
 173 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
 174 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
 175 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
 176 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
 177 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
 178 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
 179 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
 180 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
 181 */
 182 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
 183 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
 184 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
 185 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
 186
 187 /**
 188  * Check return code of a preceeding ccw_device call, halt_IO etc...
 189  *
 190  * ch   :       The channel, the error belongs to.
 191  * Returns the error code (!= 0) to inspect.
 192  */
 193 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
 194 {
 195         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 196                 "%s(%s): %s: %04x\n",
 197                 CTCM_FUNTAIL, ch->id, msg, rc);
 198         switch (rc) {
 199         case -EBUSY:
 200                 pr_info("%s: The communication peer is busy\n",
 201                         ch->id);
 202                 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
 203                 break;
 204         case -ENODEV:
 205                 pr_err("%s: The specified target device is not valid\n",
 206                        ch->id);
 207                 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
 208                 break;
 209         default:
 210                 pr_err("An I/O operation resulted in error %04x\n",
 211                        rc);
 212                 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
 213         }
 214 }
 215
 216 void ctcm_purge_skb_queue(struct sk_buff_head *q)
 217 {
 218         struct sk_buff *skb;
 219
 220         CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
 221
 222         while ((skb = skb_dequeue(q))) {
 223                 atomic_dec(&skb->users);
 224                 dev_kfree_skb_any(skb);
 225         }
 226 }
 227
 228 /**
 229  * NOP action for statemachines
 230  */
 231 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
 232 {
 233 }
 234
 235 /*
 236  * Actions for channel - statemachines.
 237  */
 238
 239 /**
 240  * Normal data has been send. Free the corresponding
 241  * skb (it's in io_queue), reset dev->tbusy and
 242  * revert to idle state.
 243  *
 244  * fi           An instance of a channel statemachine.
 245  * event        The event, just happened.
 246  * arg          Generic pointer, casted from channel * upon call.
 247  */
 248 static void chx_txdone(fsm_instance *fi, int event, void *arg)
 249 {
 250         struct channel *ch = arg;
 251         struct net_device *dev = ch->netdev;
 252         struct ctcm_priv *priv = dev->ml_priv;
 253         struct sk_buff *skb;
 254         int first = 1;
 255         int i;
 256         unsigned long duration;
 257         struct timespec done_stamp = current_kernel_time(); /* xtime */
 258
 259         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 260
 261         duration =
 262             (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
 263             (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
 264         if (duration > ch->prof.tx_time)
 265                 ch->prof.tx_time = duration;
 266
 267         if (ch->irb->scsw.cmd.count != 0)
 268                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 269                         "%s(%s): TX not complete, remaining %d bytes",
 270                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
 271         fsm_deltimer(&ch->timer);
 272         while ((skb = skb_dequeue(&ch->io_queue))) {
 273                 priv->stats.tx_packets++;
 274                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 275                 if (first) {
 276                         priv->stats.tx_bytes += 2;
 277                         first = 0;
 278                 }
 279                 atomic_dec(&skb->users);
 280                 dev_kfree_skb_irq(skb);
 281         }
 282         spin_lock(&ch->collect_lock);
 283         clear_normalized_cda(&ch->ccw[4]);
 284         if (ch->collect_len > 0) {
 285                 int rc;
 286
 287                 if (ctcm_checkalloc_buffer(ch)) {
 288                         spin_unlock(&ch->collect_lock);
 289                         return;
 290                 }
 291                 ch->trans_skb->data = ch->trans_skb_data;
 292                 skb_reset_tail_pointer(ch->trans_skb);
 293                 ch->trans_skb->len = 0;
 294                 if (ch->prof.maxmulti < (ch->collect_len + 2))
 295                         ch->prof.maxmulti = ch->collect_len + 2;
 296                 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
 297                         ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
 298                 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
 299                 i = 0;
 300                 while ((skb = skb_dequeue(&ch->collect_queue))) {
 301                         skb_copy_from_linear_data(skb,
 302                                 skb_put(ch->trans_skb, skb->len), skb->len);
 303                         priv->stats.tx_packets++;
 304                         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 305                         atomic_dec(&skb->users);
 306                         dev_kfree_skb_irq(skb);
 307                         i++;
 308                 }
 309                 ch->collect_len = 0;
 310                 spin_unlock(&ch->collect_lock);
 311                 ch->ccw[1].count = ch->trans_skb->len;
 312                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 313                 ch->prof.send_stamp = current_kernel_time(); /* xtime */
 314                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 315                                                 (unsigned long)ch, 0xff, 0);
 316                 ch->prof.doios_multi++;
 317                 if (rc != 0) {
 318                         priv->stats.tx_dropped += i;
 319                         priv->stats.tx_errors += i;
 320                         fsm_deltimer(&ch->timer);
 321                         ctcm_ccw_check_rc(ch, rc, "chained TX");
 322                 }
 323         } else {
 324                 spin_unlock(&ch->collect_lock);
 325                 fsm_newstate(fi, CTC_STATE_TXIDLE);
 326         }
 327         ctcm_clear_busy_do(dev);
 328 }
 329
 330 /**
 331  * Initial data is sent.
 332  * Notify device statemachine that we are up and
 333  * running.
 334  *
 335  * fi           An instance of a channel statemachine.
 336  * event        The event, just happened.
 337  * arg          Generic pointer, casted from channel * upon call.
 338  */
 339 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
 340 {
 341         struct channel *ch = arg;
 342         struct net_device *dev = ch->netdev;
 343         struct ctcm_priv *priv = dev->ml_priv;
 344
 345         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 346
 347         fsm_deltimer(&ch->timer);
 348         fsm_newstate(fi, CTC_STATE_TXIDLE);
 349         fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
 350 }
 351
 352 /**
 353  * Got normal data, check for sanity, queue it up, allocate new buffer
 354  * trigger bottom half, and initiate next read.
 355  *
 356  * fi           An instance of a channel statemachine.
 357  * event        The event, just happened.
 358  * arg          Generic pointer, casted from channel * upon call.
 359  */
 360 static void chx_rx(fsm_instance *fi, int event, void *arg)
 361 {
 362         struct channel *ch = arg;
 363         struct net_device *dev = ch->netdev;
 364         struct ctcm_priv *priv = dev->ml_priv;
 365         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
 366         struct sk_buff *skb = ch->trans_skb;
 367         __u16 block_len = *((__u16 *)skb->data);
 368         int check_len;
 369         int rc;
 370
 371         fsm_deltimer(&ch->timer);
 372         if (len < 8) {
 373                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 374                         "%s(%s): got packet with length %d < 8\n",
 375                                         CTCM_FUNTAIL, dev->name, len);
 376                 priv->stats.rx_dropped++;
 377                 priv->stats.rx_length_errors++;
 378                                                 goto again;
 379         }
 380         if (len > ch->max_bufsize) {
 381                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 382                         "%s(%s): got packet with length %d > %d\n",
 383                                 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
 384                 priv->stats.rx_dropped++;
 385                 priv->stats.rx_length_errors++;
 386                                                 goto again;
 387         }
 388
 389         /*
 390          * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
 391          */
 392         switch (ch->protocol) {
 393         case CTCM_PROTO_S390:
 394         case CTCM_PROTO_OS390:
 395                 check_len = block_len + 2;
 396                 break;
 397         default:
 398                 check_len = block_len;
 399                 break;
 400         }
 401         if ((len < block_len) || (len > check_len)) {
 402                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 403                         "%s(%s): got block length %d != rx length %d\n",
 404                                 CTCM_FUNTAIL, dev->name, block_len, len);
 405                 if (do_debug)
 406                         ctcmpc_dump_skb(skb, 0);
 407
 408                 *((__u16 *)skb->data) = len;
 409                 priv->stats.rx_dropped++;
 410                 priv->stats.rx_length_errors++;
 411                                                 goto again;
 412         }
 413         block_len -= 2;
 414         if (block_len > 0) {
 415                 *((__u16 *)skb->data) = block_len;
 416                 ctcm_unpack_skb(ch, skb);
 417         }
 418  again:
 419         skb->data = ch->trans_skb_data;
 420         skb_reset_tail_pointer(skb);
 421         skb->len = 0;
 422         if (ctcm_checkalloc_buffer(ch))
 423                 return;
 424         ch->ccw[1].count = ch->max_bufsize;
 425         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 426                                         (unsigned long)ch, 0xff, 0);
 427         if (rc != 0)
 428                 ctcm_ccw_check_rc(ch, rc, "normal RX");
 429 }
 430
 431 /**
 432  * Initialize connection by sending a __u16 of value 0.
 433  *
 434  * fi           An instance of a channel statemachine.
 435  * event        The event, just happened.
 436  * arg          Generic pointer, casted from channel * upon call.
 437  */
 438 static void chx_firstio(fsm_instance *fi, int event, void *arg)
 439 {
 440         int rc;
 441         struct channel *ch = arg;
 442         int fsmstate = fsm_getstate(fi);
 443
 444         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 445                 "%s(%s) : %02x",
 446                 CTCM_FUNTAIL, ch->id, fsmstate);
 447
 448         ch->sense_rc = 0;       /* reset unit check report control */
 449         if (fsmstate == CTC_STATE_TXIDLE)
 450                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 451                         "%s(%s): remote side issued READ?, init.\n",
 452                                 CTCM_FUNTAIL, ch->id);
 453         fsm_deltimer(&ch->timer);
 454         if (ctcm_checkalloc_buffer(ch))
 455                 return;
 456         if ((fsmstate == CTC_STATE_SETUPWAIT) &&
 457             (ch->protocol == CTCM_PROTO_OS390)) {
 458                 /* OS/390 resp. z/OS */
 459                 if (CHANNEL_DIRECTION(ch->flags) == READ) {
 460                         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
 461                         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
 462                                      CTC_EVENT_TIMER, ch);
 463                         chx_rxidle(fi, event, arg);
 464                 } else {
 465                         struct net_device *dev = ch->netdev;
 466                         struct ctcm_priv *priv = dev->ml_priv;
 467                         fsm_newstate(fi, CTC_STATE_TXIDLE);
 468                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
 469                 }
 470                 return;
 471         }
 472         /*
 473          * Don't setup a timer for receiving the initial RX frame
 474          * if in compatibility mode, since VM TCP delays the initial
 475          * frame until it has some data to send.
 476          */
 477         if ((CHANNEL_DIRECTION(ch->flags) == WRITE) ||
 478             (ch->protocol != CTCM_PROTO_S390))
 479                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 480
 481         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
 482         ch->ccw[1].count = 2;   /* Transfer only length */
 483
 484         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
 485                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
 486         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 487                                         (unsigned long)ch, 0xff, 0);
 488         if (rc != 0) {
 489                 fsm_deltimer(&ch->timer);
 490                 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
 491                 ctcm_ccw_check_rc(ch, rc, "init IO");
 492         }
 493         /*
 494          * If in compatibility mode since we don't setup a timer, we
 495          * also signal RX channel up immediately. This enables us
 496          * to send packets early which in turn usually triggers some
 497          * reply from VM TCP which brings up the RX channel to it's
 498          * final state.
 499          */
 500         if ((CHANNEL_DIRECTION(ch->flags) == READ) &&
 501             (ch->protocol == CTCM_PROTO_S390)) {
 502                 struct net_device *dev = ch->netdev;
 503                 struct ctcm_priv *priv = dev->ml_priv;
 504                 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
 505         }
 506 }
 507
 508 /**
 509  * Got initial data, check it. If OK,
 510  * notify device statemachine that we are up and
 511  * running.
 512  *
 513  * fi           An instance of a channel statemachine.
 514  * event        The event, just happened.
 515  * arg          Generic pointer, casted from channel * upon call.
 516  */
 517 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
 518 {
 519         struct channel *ch = arg;
 520         struct net_device *dev = ch->netdev;
 521         struct ctcm_priv *priv = dev->ml_priv;
 522         __u16 buflen;
 523         int rc;
 524
 525         fsm_deltimer(&ch->timer);
 526         buflen = *((__u16 *)ch->trans_skb->data);
 527         CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
 528                         __func__, dev->name, buflen);
 529
 530         if (buflen >= CTCM_INITIAL_BLOCKLEN) {
 531                 if (ctcm_checkalloc_buffer(ch))
 532                         return;
 533                 ch->ccw[1].count = ch->max_bufsize;
 534                 fsm_newstate(fi, CTC_STATE_RXIDLE);
 535                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 536                                                 (unsigned long)ch, 0xff, 0);
 537                 if (rc != 0) {
 538                         fsm_newstate(fi, CTC_STATE_RXINIT);
 539                         ctcm_ccw_check_rc(ch, rc, "initial RX");
 540                 } else
 541                         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
 542         } else {
 543                 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
 544                                 __func__, dev->name,
 545                                         buflen, CTCM_INITIAL_BLOCKLEN);
 546                 chx_firstio(fi, event, arg);
 547         }
 548 }
 549
 550 /**
 551  * Set channel into extended mode.
 552  *
 553  * fi           An instance of a channel statemachine.
 554  * event        The event, just happened.
 555  * arg          Generic pointer, casted from channel * upon call.
 556  */
 557 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
 558 {
 559         struct channel *ch = arg;
 560         int rc;
 561         unsigned long saveflags = 0;
 562         int timeout = CTCM_TIME_5_SEC;
 563
 564         fsm_deltimer(&ch->timer);
 565         if (IS_MPC(ch)) {
 566                 timeout = 1500;
 567                 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
 568                                 __func__, smp_processor_id(), ch, ch->id);
 569         }
 570         fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
 571         fsm_newstate(fi, CTC_STATE_SETUPWAIT);
 572         CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
 573
 574         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
 575                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 576                         /* Such conditional locking is undeterministic in
 577                          * static view. => ignore sparse warnings here. */
 578
 579         rc = ccw_device_start(ch->cdev, &ch->ccw[6],
 580                                         (unsigned long)ch, 0xff, 0);
 581         if (event == CTC_EVENT_TIMER)   /* see above comments */
 582                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 583         if (rc != 0) {
 584                 fsm_deltimer(&ch->timer);
 585                 fsm_newstate(fi, CTC_STATE_STARTWAIT);
 586                 ctcm_ccw_check_rc(ch, rc, "set Mode");
 587         } else
 588                 ch->retry = 0;
 589 }
 590
 591 /**
 592  * Setup channel.
 593  *
 594  * fi           An instance of a channel statemachine.
 595  * event        The event, just happened.
 596  * arg          Generic pointer, casted from channel * upon call.
 597  */
 598 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
 599 {
 600         struct channel *ch      = arg;
 601         unsigned long saveflags;
 602         int rc;
 603
 604         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
 605                         CTCM_FUNTAIL, ch->id,
 606                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
 607
 608         if (ch->trans_skb != NULL) {
 609                 clear_normalized_cda(&ch->ccw[1]);
 610                 dev_kfree_skb(ch->trans_skb);
 611                 ch->trans_skb = NULL;
 612         }
 613         if (CHANNEL_DIRECTION(ch->flags) == READ) {
 614                 ch->ccw[1].cmd_code = CCW_CMD_READ;
 615                 ch->ccw[1].flags = CCW_FLAG_SLI;
 616                 ch->ccw[1].count = 0;
 617         } else {
 618                 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
 619                 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 620                 ch->ccw[1].count = 0;
 621         }
 622         if (ctcm_checkalloc_buffer(ch)) {
 623                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 624                         "%s(%s): %s trans_skb alloc delayed "
 625                         "until first transfer",
 626                         CTCM_FUNTAIL, ch->id,
 627                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
 628         }
 629         ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
 630         ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 631         ch->ccw[0].count = 0;
 632         ch->ccw[0].cda = 0;
 633         ch->ccw[2].cmd_code = CCW_CMD_NOOP;     /* jointed CE + DE */
 634         ch->ccw[2].flags = CCW_FLAG_SLI;
 635         ch->ccw[2].count = 0;
 636         ch->ccw[2].cda = 0;
 637         memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
 638         ch->ccw[4].cda = 0;
 639         ch->ccw[4].flags &= ~CCW_FLAG_IDA;
 640
 641         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 642         fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
 643         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 644         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 645         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 646         if (rc != 0) {
 647                 if (rc != -EBUSY)
 648                         fsm_deltimer(&ch->timer);
 649                 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
 650         }
 651 }
 652
 653 /**
 654  * Shutdown a channel.
 655  *
 656  * fi           An instance of a channel statemachine.
 657  * event        The event, just happened.
 658  * arg          Generic pointer, casted from channel * upon call.
 659  */
 660 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
 661 {
 662         struct channel *ch = arg;
 663         unsigned long saveflags = 0;
 664         int rc;
 665         int oldstate;
 666
 667         fsm_deltimer(&ch->timer);
 668         if (IS_MPC(ch))
 669                 fsm_deltimer(&ch->sweep_timer);
 670
 671         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 672
 673         if (event == CTC_EVENT_STOP)    /* only for STOP not yet locked */
 674                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 675                         /* Such conditional locking is undeterministic in
 676                          * static view. => ignore sparse warnings here. */
 677         oldstate = fsm_getstate(fi);
 678         fsm_newstate(fi, CTC_STATE_TERM);
 679         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 680
 681         if (event == CTC_EVENT_STOP)
 682                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 683                         /* see remark above about conditional locking */
 684
 685         if (rc != 0 && rc != -EBUSY) {
 686                 fsm_deltimer(&ch->timer);
 687                 if (event != CTC_EVENT_STOP) {
 688                         fsm_newstate(fi, oldstate);
 689                         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
 690                 }
 691         }
 692 }
 693
 694 /**
 695  * Cleanup helper for chx_fail and chx_stopped
 696  * cleanup channels queue and notify interface statemachine.
 697  *
 698  * fi           An instance of a channel statemachine.
 699  * state        The next state (depending on caller).
 700  * ch           The channel to operate on.
 701  */
 702 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
 703                 struct channel *ch)
 704 {
 705         struct net_device *dev = ch->netdev;
 706         struct ctcm_priv *priv = dev->ml_priv;
 707
 708         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
 709                         "%s(%s): %s[%d]\n",
 710                         CTCM_FUNTAIL, dev->name, ch->id, state);
 711
 712         fsm_deltimer(&ch->timer);
 713         if (IS_MPC(ch))
 714                 fsm_deltimer(&ch->sweep_timer);
 715
 716         fsm_newstate(fi, state);
 717         if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
 718                 clear_normalized_cda(&ch->ccw[1]);
 719                 dev_kfree_skb_any(ch->trans_skb);
 720                 ch->trans_skb = NULL;
 721         }
 722
 723         ch->th_seg = 0x00;
 724         ch->th_seq_num = 0x00;
 725         if (CHANNEL_DIRECTION(ch->flags) == READ) {
 726                 skb_queue_purge(&ch->io_queue);
 727                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 728         } else {
 729                 ctcm_purge_skb_queue(&ch->io_queue);
 730                 if (IS_MPC(ch))
 731                         ctcm_purge_skb_queue(&ch->sweep_queue);
 732                 spin_lock(&ch->collect_lock);
 733                 ctcm_purge_skb_queue(&ch->collect_queue);
 734                 ch->collect_len = 0;
 735                 spin_unlock(&ch->collect_lock);
 736                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 737         }
 738 }
 739
 740 /**
 741  * A channel has successfully been halted.
 742  * Cleanup it's queue and notify interface statemachine.
 743  *
 744  * fi           An instance of a channel statemachine.
 745  * event        The event, just happened.
 746  * arg          Generic pointer, casted from channel * upon call.
 747  */
 748 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
 749 {
 750         ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
 751 }
 752
 753 /**
 754  * A stop command from device statemachine arrived and we are in
 755  * not operational mode. Set state to stopped.
 756  *
 757  * fi           An instance of a channel statemachine.
 758  * event        The event, just happened.
 759  * arg          Generic pointer, casted from channel * upon call.
 760  */
 761 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
 762 {
 763         fsm_newstate(fi, CTC_STATE_STOPPED);
 764 }
 765
 766 /**
 767  * A machine check for no path, not operational status or gone device has
 768  * happened.
 769  * Cleanup queue and notify interface statemachine.
 770  *
 771  * fi           An instance of a channel statemachine.
 772  * event        The event, just happened.
 773  * arg          Generic pointer, casted from channel * upon call.
 774  */
 775 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
 776 {
 777         ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
 778 }
 779
 780 /**
 781  * Handle error during setup of channel.
 782  *
 783  * fi           An instance of a channel statemachine.
 784  * event        The event, just happened.
 785  * arg          Generic pointer, casted from channel * upon call.
 786  */
 787 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
 788 {
 789         struct channel *ch = arg;
 790         struct net_device *dev = ch->netdev;
 791         struct ctcm_priv *priv = dev->ml_priv;
 792
 793         /*
 794          * Special case: Got UC_RCRESET on setmode.
 795          * This means that remote side isn't setup. In this case
 796          * simply retry after some 10 secs...
 797          */
 798         if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
 799             ((event == CTC_EVENT_UC_RCRESET) ||
 800              (event == CTC_EVENT_UC_RSRESET))) {
 801                 fsm_newstate(fi, CTC_STATE_STARTRETRY);
 802                 fsm_deltimer(&ch->timer);
 803                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 804                 if (!IS_MPC(ch) && (CHANNEL_DIRECTION(ch->flags) == READ)) {
 805                         int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 806                         if (rc != 0)
 807                                 ctcm_ccw_check_rc(ch, rc,
 808                                         "HaltIO in chx_setuperr");
 809                 }
 810                 return;
 811         }
 812
 813         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
 814                 "%s(%s) : %s error during %s channel setup state=%s\n",
 815                 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
 816                 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX",
 817                 fsm_getstate_str(fi));
 818
 819         if (CHANNEL_DIRECTION(ch->flags) == READ) {
 820                 fsm_newstate(fi, CTC_STATE_RXERR);
 821                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 822         } else {
 823                 fsm_newstate(fi, CTC_STATE_TXERR);
 824                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 825         }
 826 }
 827
 828 /**
 829  * Restart a channel after an error.
 830  *
 831  * fi           An instance of a channel statemachine.
 832  * event        The event, just happened.
 833  * arg          Generic pointer, casted from channel * upon call.
 834  */
 835 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
 836 {
 837         struct channel *ch = arg;
 838         struct net_device *dev = ch->netdev;
 839         unsigned long saveflags = 0;
 840         int oldstate;
 841         int rc;
 842
 843         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 844                 "%s: %s[%d] of %s\n",
 845                         CTCM_FUNTAIL, ch->id, event, dev->name);
 846
 847         fsm_deltimer(&ch->timer);
 848
 849         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 850         oldstate = fsm_getstate(fi);
 851         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 852         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
 853                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 854                         /* Such conditional locking is a known problem for
 855                          * sparse because its undeterministic in static view.
 856                          * Warnings should be ignored here. */
 857         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 858         if (event == CTC_EVENT_TIMER)
 859                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 860         if (rc != 0) {
 861                 if (rc != -EBUSY) {
 862                     fsm_deltimer(&ch->timer);
 863                     fsm_newstate(fi, oldstate);
 864                 }
 865                 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
 866         }
 867 }
 868
 869 /**
 870  * Handle error during RX initial handshake (exchange of
 871  * 0-length block header)
 872  *
 873  * fi           An instance of a channel statemachine.
 874  * event        The event, just happened.
 875  * arg          Generic pointer, casted from channel * upon call.
 876  */
 877 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
 878 {
 879         struct channel *ch = arg;
 880         struct net_device *dev = ch->netdev;
 881         struct ctcm_priv *priv = dev->ml_priv;
 882
 883         if (event == CTC_EVENT_TIMER) {
 884                 if (!IS_MPCDEV(dev))
 885                         /* TODO : check if MPC deletes timer somewhere */
 886                         fsm_deltimer(&ch->timer);
 887                 if (ch->retry++ < 3)
 888                         ctcm_chx_restart(fi, event, arg);
 889                 else {
 890                         fsm_newstate(fi, CTC_STATE_RXERR);
 891                         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 892                 }
 893         } else {
 894                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 895                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 896                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 897
 898                 dev_warn(&dev->dev,
 899                         "Initialization failed with RX/TX init handshake "
 900                         "error %s\n", ctc_ch_event_names[event]);
 901         }
 902 }
 903
 904 /**
 905  * Notify device statemachine if we gave up initialization
 906  * of RX channel.
 907  *
 908  * fi           An instance of a channel statemachine.
 909  * event        The event, just happened.
 910  * arg          Generic pointer, casted from channel * upon call.
 911  */
 912 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
 913 {
 914         struct channel *ch = arg;
 915         struct net_device *dev = ch->netdev;
 916         struct ctcm_priv *priv = dev->ml_priv;
 917
 918         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 919                         "%s(%s): RX %s busy, init. fail",
 920                                 CTCM_FUNTAIL, dev->name, ch->id);
 921         fsm_newstate(fi, CTC_STATE_RXERR);
 922         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 923 }
 924
 925 /**
 926  * Handle RX Unit check remote reset (remote disconnected)
 927  *
 928  * fi           An instance of a channel statemachine.
 929  * event        The event, just happened.
 930  * arg          Generic pointer, casted from channel * upon call.
 931  */
 932 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
 933 {
 934         struct channel *ch = arg;
 935         struct channel *ch2;
 936         struct net_device *dev = ch->netdev;
 937         struct ctcm_priv *priv = dev->ml_priv;
 938
 939         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 940                         "%s: %s: remote disconnect - re-init ...",
 941                                 CTCM_FUNTAIL, dev->name);
 942         fsm_deltimer(&ch->timer);
 943         /*
 944          * Notify device statemachine
 945          */
 946         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 947         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 948
 949         fsm_newstate(fi, CTC_STATE_DTERM);
 950         ch2 = priv->channel[WRITE];
 951         fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
 952
 953         ccw_device_halt(ch->cdev, (unsigned long)ch);
 954         ccw_device_halt(ch2->cdev, (unsigned long)ch2);
 955 }
 956
 957 /**
 958  * Handle error during TX channel initialization.
 959  *
 960  * fi           An instance of a channel statemachine.
 961  * event        The event, just happened.
 962  * arg          Generic pointer, casted from channel * upon call.
 963  */
 964 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
 965 {
 966         struct channel *ch = arg;
 967         struct net_device *dev = ch->netdev;
 968         struct ctcm_priv *priv = dev->ml_priv;
 969
 970         if (event == CTC_EVENT_TIMER) {
 971                 fsm_deltimer(&ch->timer);
 972                 if (ch->retry++ < 3)
 973                         ctcm_chx_restart(fi, event, arg);
 974                 else {
 975                         fsm_newstate(fi, CTC_STATE_TXERR);
 976                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 977                 }
 978         } else {
 979                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 980                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 981                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 982
 983                 dev_warn(&dev->dev,
 984                         "Initialization failed with RX/TX init handshake "
 985                         "error %s\n", ctc_ch_event_names[event]);
 986         }
 987 }
 988
 989 /**
 990  * Handle TX timeout by retrying operation.
 991  *
 992  * fi           An instance of a channel statemachine.
 993  * event        The event, just happened.
 994  * arg          Generic pointer, casted from channel * upon call.
 995  */
 996 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
 997 {
 998         struct channel *ch = arg;
 999         struct net_device *dev = ch->netdev;
1000         struct ctcm_priv *priv = dev->ml_priv;
1001         struct sk_buff *skb;
1002
1003         CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1004                         __func__, smp_processor_id(), ch, ch->id);
1005
1006         fsm_deltimer(&ch->timer);
1007         if (ch->retry++ > 3) {
1008                 struct mpc_group *gptr = priv->mpcg;
1009                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1010                                 "%s: %s: retries exceeded",
1011                                         CTCM_FUNTAIL, ch->id);
1012                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1013                 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1014                         use gptr as mpc indicator */
1015                 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1016                         ctcm_chx_restart(fi, event, arg);
1017                                 goto done;
1018         }
1019
1020         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1021                         "%s : %s: retry %d",
1022                                 CTCM_FUNTAIL, ch->id, ch->retry);
1023         skb = skb_peek(&ch->io_queue);
1024         if (skb) {
1025                 int rc = 0;
1026                 unsigned long saveflags = 0;
1027                 clear_normalized_cda(&ch->ccw[4]);
1028                 ch->ccw[4].count = skb->len;
1029                 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1030                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1031                                 "%s: %s: IDAL alloc failed",
1032                                                 CTCM_FUNTAIL, ch->id);
1033                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1034                         ctcm_chx_restart(fi, event, arg);
1035                                 goto done;
1036                 }
1037                 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1038                 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1039                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1040                         /* Such conditional locking is a known problem for
1041                          * sparse because its undeterministic in static view.
1042                          * Warnings should be ignored here. */
1043                 if (do_debug_ccw)
1044                         ctcmpc_dumpit((char *)&ch->ccw[3],
1045                                         sizeof(struct ccw1) * 3);
1046
1047                 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1048                                                 (unsigned long)ch, 0xff, 0);
1049                 if (event == CTC_EVENT_TIMER)
1050                         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1051                                         saveflags);
1052                 if (rc != 0) {
1053                         fsm_deltimer(&ch->timer);
1054                         ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1055                         ctcm_purge_skb_queue(&ch->io_queue);
1056                 }
1057         }
1058 done:
1059         return;
1060 }
1061
1062 /**
1063  * Handle fatal errors during an I/O command.
1064  *
1065  * fi           An instance of a channel statemachine.
1066  * event        The event, just happened.
1067  * arg          Generic pointer, casted from channel * upon call.
1068  */
1069 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1070 {
1071         struct channel *ch = arg;
1072         struct net_device *dev = ch->netdev;
1073         struct ctcm_priv *priv = dev->ml_priv;
1074         int rd = CHANNEL_DIRECTION(ch->flags);
1075
1076         fsm_deltimer(&ch->timer);
1077         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1078                 "%s: %s: %s unrecoverable channel error",
1079                         CTCM_FUNTAIL, ch->id, rd == READ ? "RX" : "TX");
1080
1081         if (IS_MPC(ch)) {
1082                 priv->stats.tx_dropped++;
1083                 priv->stats.tx_errors++;
1084         }
1085         if (rd == READ) {
1086                 fsm_newstate(fi, CTC_STATE_RXERR);
1087                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1088         } else {
1089                 fsm_newstate(fi, CTC_STATE_TXERR);
1090                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1091         }
1092 }
1093
1094 /*
1095  * The ctcm statemachine for a channel.
1096  */
1097 const fsm_node ch_fsm[] = {
1098         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1099         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1100         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1101         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1102
1103         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1104         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1105         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1106         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1107         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1108
1109         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1110         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1111         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1112         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1113         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1114         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1115
1116         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1117         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1118         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1119         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1120
1121         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1122         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1123         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      chx_firstio  },
1124         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1125         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1126         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1127         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1128         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1129
1130         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1131         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1132         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      chx_rxidle  },
1133         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1134         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1135         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1136         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1137         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1138         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      chx_firstio  },
1139         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1140
1141         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1142         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1143         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      chx_rx  },
1144         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1145         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1146         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1147         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      chx_rx  },
1148
1149         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1150         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1151         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1152         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1153         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1154         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
1155         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1156         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1157
1158         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1159         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1160         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      chx_firstio  },
1161         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1162         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1163         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1164         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1165
1166         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
1167         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
1168         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
1169         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1170         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1171         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1172
1173         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1174         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
1175         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1176         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1177         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1178         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1179
1180         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
1181         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
1182         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      chx_txdone  },
1183         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_txretry  },
1184         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_txretry  },
1185         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
1186         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1187         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1188
1189         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1190         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1191         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1192         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1193 };
1194
1195 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1196
1197 /*
1198  * MPC actions for mpc channel statemachine
1199  * handling of MPC protocol requires extra
1200  * statemachine and actions which are prefixed ctcmpc_ .
1201  * The ctc_ch_states and ctc_ch_state_names,
1202  * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1203  * which are expanded by some elements.
1204  */
1205
1206 /*
1207  * Actions for mpc channel statemachine.
1208  */
1209
1210 /**
1211  * Normal data has been send. Free the corresponding
1212  * skb (it's in io_queue), reset dev->tbusy and
1213  * revert to idle state.
1214  *
1215  * fi           An instance of a channel statemachine.
1216  * event        The event, just happened.
1217  * arg          Generic pointer, casted from channel * upon call.
1218  */
1219 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1220 {
1221         struct channel          *ch = arg;
1222         struct net_device       *dev = ch->netdev;
1223         struct ctcm_priv        *priv = dev->ml_priv;
1224         struct mpc_group        *grp = priv->mpcg;
1225         struct sk_buff          *skb;
1226         int             first = 1;
1227         int             i;
1228         __u32           data_space;
1229         unsigned long   duration;
1230         struct sk_buff  *peekskb;
1231         int             rc;
1232         struct th_header *header;
1233         struct pdu      *p_header;
1234         struct timespec done_stamp = current_kernel_time(); /* xtime */
1235
1236         CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1237                         __func__, dev->name, smp_processor_id());
1238
1239         duration =
1240                 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1241                 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1242         if (duration > ch->prof.tx_time)
1243                 ch->prof.tx_time = duration;
1244
1245         if (ch->irb->scsw.cmd.count != 0)
1246                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1247                         "%s(%s): TX not complete, remaining %d bytes",
1248                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1249         fsm_deltimer(&ch->timer);
1250         while ((skb = skb_dequeue(&ch->io_queue))) {
1251                 priv->stats.tx_packets++;
1252                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1253                 if (first) {
1254                         priv->stats.tx_bytes += 2;
1255                         first = 0;
1256                 }
1257                 atomic_dec(&skb->users);
1258                 dev_kfree_skb_irq(skb);
1259         }
1260         spin_lock(&ch->collect_lock);
1261         clear_normalized_cda(&ch->ccw[4]);
1262         if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1263                 spin_unlock(&ch->collect_lock);
1264                 fsm_newstate(fi, CTC_STATE_TXIDLE);
1265                                 goto done;
1266         }
1267
1268         if (ctcm_checkalloc_buffer(ch)) {
1269                 spin_unlock(&ch->collect_lock);
1270                                 goto done;
1271         }
1272         ch->trans_skb->data = ch->trans_skb_data;
1273         skb_reset_tail_pointer(ch->trans_skb);
1274         ch->trans_skb->len = 0;
1275         if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1276                 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1277         if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1278                 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1279         i = 0;
1280         p_header = NULL;
1281         data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1282
1283         CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1284                        " data_space:%04x\n",
1285                        __func__, data_space);
1286
1287         while ((skb = skb_dequeue(&ch->collect_queue))) {
1288                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1289                 p_header = (struct pdu *)
1290                         (skb_tail_pointer(ch->trans_skb) - skb->len);
1291                 p_header->pdu_flag = 0x00;
1292                 if (skb->protocol == ntohs(ETH_P_SNAP))
1293                         p_header->pdu_flag |= 0x60;
1294                 else
1295                         p_header->pdu_flag |= 0x20;
1296
1297                 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1298                                 __func__, ch->trans_skb->len);
1299                 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1300                                 " to 32 bytes sent to vtam\n", __func__);
1301                 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1302
1303                 ch->collect_len -= skb->len;
1304                 data_space -= skb->len;
1305                 priv->stats.tx_packets++;
1306                 priv->stats.tx_bytes += skb->len;
1307                 atomic_dec(&skb->users);
1308                 dev_kfree_skb_any(skb);
1309                 peekskb = skb_peek(&ch->collect_queue);
1310                 if (peekskb->len > data_space)
1311                         break;
1312                 i++;
1313         }
1314         /* p_header points to the last one we handled */
1315         if (p_header)
1316                 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1317         header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1318         if (!header) {
1319                 spin_unlock(&ch->collect_lock);
1320                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1321                                 goto done;
1322         }
1323         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
1324         ch->th_seq_num++;
1325         header->th_seq_num = ch->th_seq_num;
1326
1327         CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1328                                         __func__, ch->th_seq_num);
1329
1330         memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1331                 TH_HEADER_LENGTH);      /* put the TH on the packet */
1332
1333         kfree(header);
1334
1335         CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1336                        __func__, ch->trans_skb->len);
1337         CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1338                         "data to vtam from collect_q\n", __func__);
1339         CTCM_D3_DUMP((char *)ch->trans_skb->data,
1340                                 min_t(int, ch->trans_skb->len, 50));
1341
1342         spin_unlock(&ch->collect_lock);
1343         clear_normalized_cda(&ch->ccw[1]);
1344         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1345                 dev_kfree_skb_any(ch->trans_skb);
1346                 ch->trans_skb = NULL;
1347                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1348                         "%s: %s: IDAL alloc failed",
1349                                 CTCM_FUNTAIL, ch->id);
1350                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1351                 return;
1352         }
1353         ch->ccw[1].count = ch->trans_skb->len;
1354         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1355         ch->prof.send_stamp = current_kernel_time(); /* xtime */
1356         if (do_debug_ccw)
1357                 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1358         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1359                                         (unsigned long)ch, 0xff, 0);
1360         ch->prof.doios_multi++;
1361         if (rc != 0) {
1362                 priv->stats.tx_dropped += i;
1363                 priv->stats.tx_errors += i;
1364                 fsm_deltimer(&ch->timer);
1365                 ctcm_ccw_check_rc(ch, rc, "chained TX");
1366         }
1367 done:
1368         ctcm_clear_busy(dev);
1369         return;
1370 }
1371
1372 /**
1373  * Got normal data, check for sanity, queue it up, allocate new buffer
1374  * trigger bottom half, and initiate next read.
1375  *
1376  * fi           An instance of a channel statemachine.
1377  * event        The event, just happened.
1378  * arg          Generic pointer, casted from channel * upon call.
1379  */
1380 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1381 {
1382         struct channel          *ch = arg;
1383         struct net_device       *dev = ch->netdev;
1384         struct ctcm_priv        *priv = dev->ml_priv;
1385         struct mpc_group        *grp = priv->mpcg;
1386         struct sk_buff          *skb = ch->trans_skb;
1387         struct sk_buff          *new_skb;
1388         unsigned long           saveflags = 0;  /* avoids compiler warning */
1389         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1390
1391         CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1392                         CTCM_FUNTAIL, dev->name, smp_processor_id(),
1393                                 ch->id, ch->max_bufsize, len);
1394         fsm_deltimer(&ch->timer);
1395
1396         if (skb == NULL) {
1397                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1398                         "%s(%s): TRANS_SKB = NULL",
1399                                 CTCM_FUNTAIL, dev->name);
1400                         goto again;
1401         }
1402
1403         if (len < TH_HEADER_LENGTH) {
1404                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1405                                 "%s(%s): packet length %d to short",
1406                                         CTCM_FUNTAIL, dev->name, len);
1407                 priv->stats.rx_dropped++;
1408                 priv->stats.rx_length_errors++;
1409         } else {
1410                 /* must have valid th header or game over */
1411                 __u32   block_len = len;
1412                 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1413                 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1414
1415                 if (new_skb == NULL) {
1416                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1417                                 "%s(%d): skb allocation failed",
1418                                                 CTCM_FUNTAIL, dev->name);
1419                         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1420                                         goto again;
1421                 }
1422                 switch (fsm_getstate(grp->fsm)) {
1423                 case MPCG_STATE_RESET:
1424                 case MPCG_STATE_INOP:
1425                         dev_kfree_skb_any(new_skb);
1426                         break;
1427                 case MPCG_STATE_FLOWC:
1428                 case MPCG_STATE_READY:
1429                         memcpy(skb_put(new_skb, block_len),
1430                                                skb->data, block_len);
1431                         skb_queue_tail(&ch->io_queue, new_skb);
1432                         tasklet_schedule(&ch->ch_tasklet);
1433                         break;
1434                 default:
1435                         memcpy(skb_put(new_skb, len), skb->data, len);
1436                         skb_queue_tail(&ch->io_queue, new_skb);
1437                         tasklet_hi_schedule(&ch->ch_tasklet);
1438                         break;
1439                 }
1440         }
1441
1442 again:
1443         switch (fsm_getstate(grp->fsm)) {
1444         int rc, dolock;
1445         case MPCG_STATE_FLOWC:
1446         case MPCG_STATE_READY:
1447                 if (ctcm_checkalloc_buffer(ch))
1448                         break;
1449                 ch->trans_skb->data = ch->trans_skb_data;
1450                 skb_reset_tail_pointer(ch->trans_skb);
1451                 ch->trans_skb->len = 0;
1452                 ch->ccw[1].count = ch->max_bufsize;
1453                         if (do_debug_ccw)
1454                         ctcmpc_dumpit((char *)&ch->ccw[0],
1455                                         sizeof(struct ccw1) * 3);
1456                 dolock = !in_irq();
1457                 if (dolock)
1458                         spin_lock_irqsave(
1459                                 get_ccwdev_lock(ch->cdev), saveflags);
1460                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1461                                                 (unsigned long)ch, 0xff, 0);
1462                 if (dolock) /* see remark about conditional locking */
1463                         spin_unlock_irqrestore(
1464                                 get_ccwdev_lock(ch->cdev), saveflags);
1465                 if (rc != 0)
1466                         ctcm_ccw_check_rc(ch, rc, "normal RX");
1467         default:
1468                 break;
1469         }
1470
1471         CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1472                         __func__, dev->name, ch, ch->id);
1473
1474 }
1475
1476 /**
1477  * Initialize connection by sending a __u16 of value 0.
1478  *
1479  * fi           An instance of a channel statemachine.
1480  * event        The event, just happened.
1481  * arg          Generic pointer, casted from channel * upon call.
1482  */
1483 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1484 {
1485         struct channel          *ch = arg;
1486         struct net_device       *dev = ch->netdev;
1487         struct ctcm_priv        *priv = dev->ml_priv;
1488         struct mpc_group        *gptr = priv->mpcg;
1489
1490         CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1491                                 __func__, ch->id, ch);
1492
1493         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1494                         "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1495                         CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1496                         fsm_getstate(gptr->fsm), ch->protocol);
1497
1498         if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1499                 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1500
1501         fsm_deltimer(&ch->timer);
1502         if (ctcm_checkalloc_buffer(ch))
1503                                 goto done;
1504
1505         switch (fsm_getstate(fi)) {
1506         case CTC_STATE_STARTRETRY:
1507         case CTC_STATE_SETUPWAIT:
1508                 if (CHANNEL_DIRECTION(ch->flags) == READ) {
1509                         ctcmpc_chx_rxidle(fi, event, arg);
1510                 } else {
1511                         fsm_newstate(fi, CTC_STATE_TXIDLE);
1512                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1513                 }
1514                                 goto done;
1515         default:
1516                 break;
1517         };
1518
1519         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ)
1520                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1521
1522 done:
1523         CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1524                                 __func__, ch->id, ch);
1525         return;
1526 }
1527
1528 /**
1529  * Got initial data, check it. If OK,
1530  * notify device statemachine that we are up and
1531  * running.
1532  *
1533  * fi           An instance of a channel statemachine.
1534  * event        The event, just happened.
1535  * arg          Generic pointer, casted from channel * upon call.
1536  */
1537 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1538 {
1539         struct channel *ch = arg;
1540         struct net_device *dev = ch->netdev;
1541         struct ctcm_priv  *priv = dev->ml_priv;
1542         struct mpc_group  *grp = priv->mpcg;
1543         int rc;
1544         unsigned long saveflags = 0;    /* avoids compiler warning */
1545
1546         fsm_deltimer(&ch->timer);
1547         CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1548                         __func__, ch->id, dev->name, smp_processor_id(),
1549                                 fsm_getstate(fi), fsm_getstate(grp->fsm));
1550
1551         fsm_newstate(fi, CTC_STATE_RXIDLE);
1552         /* XID processing complete */
1553
1554         switch (fsm_getstate(grp->fsm)) {
1555         case MPCG_STATE_FLOWC:
1556         case MPCG_STATE_READY:
1557                 if (ctcm_checkalloc_buffer(ch))
1558                                 goto done;
1559                 ch->trans_skb->data = ch->trans_skb_data;
1560                 skb_reset_tail_pointer(ch->trans_skb);
1561                 ch->trans_skb->len = 0;
1562                 ch->ccw[1].count = ch->max_bufsize;
1563                 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1564                 if (event == CTC_EVENT_START)
1565                         /* see remark about conditional locking */
1566                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1567                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1568                                                 (unsigned long)ch, 0xff, 0);
1569                 if (event == CTC_EVENT_START)
1570                         spin_unlock_irqrestore(
1571                                         get_ccwdev_lock(ch->cdev), saveflags);
1572                 if (rc != 0) {
1573                         fsm_newstate(fi, CTC_STATE_RXINIT);
1574                         ctcm_ccw_check_rc(ch, rc, "initial RX");
1575                                 goto done;
1576                 }
1577                 break;
1578         default:
1579                 break;
1580         }
1581
1582         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1583 done:
1584         return;
1585 }
1586
1587 /*
1588  * ctcmpc channel FSM action
1589  * called from several points in ctcmpc_ch_fsm
1590  * ctcmpc only
1591  */
1592 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1593 {
1594         struct channel    *ch     = arg;
1595         struct net_device *dev    = ch->netdev;
1596         struct ctcm_priv  *priv   = dev->ml_priv;
1597         struct mpc_group  *grp = priv->mpcg;
1598
1599         CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1600                 __func__, dev->name, ch->id, ch, smp_processor_id(),
1601                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1602
1603         switch (fsm_getstate(grp->fsm)) {
1604         case MPCG_STATE_XID2INITW:
1605                 /* ok..start yside xid exchanges */
1606                 if (!ch->in_mpcgroup)
1607                         break;
1608                 if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
1609                         fsm_deltimer(&grp->timer);
1610                         fsm_addtimer(&grp->timer,
1611                                 MPC_XID_TIMEOUT_VALUE,
1612                                 MPCG_EVENT_TIMER, dev);
1613                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1614
1615                 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1616                         /* attn rcvd before xid0 processed via bh */
1617                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1618                 break;
1619         case MPCG_STATE_XID2INITX:
1620         case MPCG_STATE_XID0IOWAIT:
1621         case MPCG_STATE_XID0IOWAIX:
1622                 /* attn rcvd before xid0 processed on ch
1623                 but mid-xid0 processing for group    */
1624                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1625                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1626                 break;
1627         case MPCG_STATE_XID7INITW:
1628         case MPCG_STATE_XID7INITX:
1629         case MPCG_STATE_XID7INITI:
1630         case MPCG_STATE_XID7INITZ:
1631                 switch (fsm_getstate(ch->fsm)) {
1632                 case CH_XID7_PENDING:
1633                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1634                         break;
1635                 case CH_XID7_PENDING2:
1636                         fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1637                         break;
1638                 }
1639                 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1640                 break;
1641         }
1642
1643         return;
1644 }
1645
1646 /*
1647  * ctcmpc channel FSM action
1648  * called from one point in ctcmpc_ch_fsm
1649  * ctcmpc only
1650  */
1651 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1652 {
1653         struct channel    *ch     = arg;
1654         struct net_device *dev    = ch->netdev;
1655         struct ctcm_priv  *priv   = dev->ml_priv;
1656         struct mpc_group  *grp    = priv->mpcg;
1657
1658         CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
1659                         __func__, dev->name, ch->id,
1660                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1661
1662         fsm_deltimer(&ch->timer);
1663
1664         switch (fsm_getstate(grp->fsm)) {
1665         case MPCG_STATE_XID0IOWAIT:
1666                 /* vtam wants to be primary.start yside xid exchanges*/
1667                 /* only receive one attn-busy at a time so must not  */
1668                 /* change state each time                            */
1669                 grp->changed_side = 1;
1670                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1671                 break;
1672         case MPCG_STATE_XID2INITW:
1673                 if (grp->changed_side == 1) {
1674                         grp->changed_side = 2;
1675                         break;
1676                 }
1677                 /* process began via call to establish_conn      */
1678                 /* so must report failure instead of reverting   */
1679                 /* back to ready-for-xid passive state           */
1680                 if (grp->estconnfunc)
1681                                 goto done;
1682                 /* this attnbusy is NOT the result of xside xid  */
1683                 /* collisions so yside must have been triggered  */
1684                 /* by an ATTN that was not intended to start XID */
1685                 /* processing. Revert back to ready-for-xid and  */
1686                 /* wait for ATTN interrupt to signal xid start   */
1687                 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1688                         fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1689                         fsm_deltimer(&grp->timer);
1690                                 goto done;
1691                 }
1692                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1693                                 goto done;
1694         case MPCG_STATE_XID2INITX:
1695                 /* XID2 was received before ATTN Busy for second
1696                    channel.Send yside xid for second channel.
1697                 */
1698                 if (grp->changed_side == 1) {
1699                         grp->changed_side = 2;
1700                         break;
1701                 }
1702         case MPCG_STATE_XID0IOWAIX:
1703         case MPCG_STATE_XID7INITW:
1704         case MPCG_STATE_XID7INITX:
1705         case MPCG_STATE_XID7INITI:
1706         case MPCG_STATE_XID7INITZ:
1707         default:
1708                 /* multiple attn-busy indicates too out-of-sync      */
1709                 /* and they are certainly not being received as part */
1710                 /* of valid mpc group negotiations..                 */
1711                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1712                                 goto done;
1713         }
1714
1715         if (grp->changed_side == 1) {
1716                 fsm_deltimer(&grp->timer);
1717                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1718                              MPCG_EVENT_TIMER, dev);
1719         }
1720         if (ch->in_mpcgroup)
1721                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1722         else
1723                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1724                         "%s(%s): channel %s not added to group",
1725                                 CTCM_FUNTAIL, dev->name, ch->id);
1726
1727 done:
1728         return;
1729 }
1730
1731 /*
1732  * ctcmpc channel FSM action
1733  * called from several points in ctcmpc_ch_fsm
1734  * ctcmpc only
1735  */
1736 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1737 {
1738         struct channel     *ch     = arg;
1739         struct net_device  *dev    = ch->netdev;
1740         struct ctcm_priv   *priv   = dev->ml_priv;
1741         struct mpc_group   *grp    = priv->mpcg;
1742
1743         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1744         return;
1745 }
1746
1747 /*
1748  * ctcmpc channel FSM action
1749  * called from several points in ctcmpc_ch_fsm
1750  * ctcmpc only
1751  */
1752 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1753 {
1754         struct channel *ach = arg;
1755         struct net_device *dev = ach->netdev;
1756         struct ctcm_priv *priv = dev->ml_priv;
1757         struct mpc_group *grp = priv->mpcg;
1758         struct channel *wch = priv->channel[WRITE];
1759         struct channel *rch = priv->channel[READ];
1760         struct sk_buff *skb;
1761         struct th_sweep *header;
1762         int rc = 0;
1763         unsigned long saveflags = 0;
1764
1765         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1766                         __func__, smp_processor_id(), ach, ach->id);
1767
1768         if (grp->in_sweep == 0)
1769                                 goto done;
1770
1771         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1772                                 __func__, wch->th_seq_num);
1773         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1774                                 __func__, rch->th_seq_num);
1775
1776         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1777                 /* give the previous IO time to complete */
1778                 fsm_addtimer(&wch->sweep_timer,
1779                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1780                                 goto done;
1781         }
1782
1783         skb = skb_dequeue(&wch->sweep_queue);
1784         if (!skb)
1785                                 goto done;
1786
1787         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1788                 grp->in_sweep = 0;
1789                 ctcm_clear_busy_do(dev);
1790                 dev_kfree_skb_any(skb);
1791                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1792                                 goto done;
1793         } else {
1794                 atomic_inc(&skb->users);
1795                 skb_queue_tail(&wch->io_queue, skb);
1796         }
1797
1798         /* send out the sweep */
1799         wch->ccw[4].count = skb->len;
1800
1801         header = (struct th_sweep *)skb->data;
1802         switch (header->th.th_ch_flag) {
1803         case TH_SWEEP_REQ:
1804                 grp->sweep_req_pend_num--;
1805                 break;
1806         case TH_SWEEP_RESP:
1807                 grp->sweep_rsp_pend_num--;
1808                 break;
1809         }
1810
1811         header->sw.th_last_seq = wch->th_seq_num;
1812
1813         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1814         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1815         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1816
1817         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1818         fsm_newstate(wch->fsm, CTC_STATE_TX);
1819
1820         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1821         wch->prof.send_stamp = current_kernel_time(); /* xtime */
1822         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1823                                         (unsigned long) wch, 0xff, 0);
1824         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1825
1826         if ((grp->sweep_req_pend_num == 0) &&
1827            (grp->sweep_rsp_pend_num == 0)) {
1828                 grp->in_sweep = 0;
1829                 rch->th_seq_num = 0x00;
1830                 wch->th_seq_num = 0x00;
1831                 ctcm_clear_busy_do(dev);
1832         }
1833
1834         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1835                         __func__, wch->th_seq_num, rch->th_seq_num);
1836
1837         if (rc != 0)
1838                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1839
1840 done:
1841         return;
1842 }
1843
1844
1845 /*
1846  * The ctcmpc statemachine for a channel.
1847  */
1848
1849 const fsm_node ctcmpc_ch_fsm[] = {
1850         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1851         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1852         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1853         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1854         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1855
1856         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1857         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1858         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1859         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1860         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1861         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1862         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1863         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1864
1865         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1866         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1867         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1868         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1869         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1870         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1871
1872         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1873         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1874         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1875         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1876         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1877
1878         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1879         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1880         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1881         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1882         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1883         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1884         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1885         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1886
1887         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1888         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1889         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1890         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1891         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1892         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1893         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1894         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1895         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1896         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1897
1898         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1899         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1900         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1901         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1902         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1903         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1904         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1905         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1906         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1907         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1908
1909         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1910         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1911         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1912         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1913         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1914         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1915         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1916         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1917         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1918         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1919         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1920
1921         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1922         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1923         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1924         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1925         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1926         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1927         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1928         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1929         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1930         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1931         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1932         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1933         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1934
1935         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1936         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1937         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1938         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1939         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1940         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1941         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1942         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1943         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1944         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1945         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1946         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1947
1948         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1949         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1950         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1951         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1952         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1953         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1954         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1955         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1956         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1957         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1958         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1959         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1960
1961         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1962         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1963         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1964         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1965         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1966         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1967         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1968         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1969         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1970         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1971         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1972         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1973
1974         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1975         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1976         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1977         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1978         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1979         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1980         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1981         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1982         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1983         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1984         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1985         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1986
1987         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1988         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1989         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1990         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1991         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
1992         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1993         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1994         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1995
1996         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1997         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1998         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1999         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
2000         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
2001         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2002         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2003         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2004         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2005
2006         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2007         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2008         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2009         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2010         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2011         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2012         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2013         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2014
2015         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2016         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2017         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2018         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2019         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2020         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2021         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2022         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2023
2024         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2025         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2026         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2027         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2028         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2029         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2030         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2031
2032         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2033         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2034         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2035         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2036         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2037         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2038         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2039         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2040         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2041         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2042
2043         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2044         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2045         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2046         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2047         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2048 };
2049
2050 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2051
2052 /*
2053  * Actions for interface - statemachine.
2054  */
2055
2056 /**
2057  * Startup channels by sending CTC_EVENT_START to each channel.
2058  *
2059  * fi           An instance of an interface statemachine.
2060  * event        The event, just happened.
2061  * arg          Generic pointer, casted from struct net_device * upon call.
2062  */
2063 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2064 {
2065         struct net_device *dev = arg;
2066         struct ctcm_priv *priv = dev->ml_priv;
2067         int direction;
2068
2069         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2070
2071         fsm_deltimer(&priv->restart_timer);
2072         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2073         if (IS_MPC(priv))
2074                 priv->mpcg->channels_terminating = 0;
2075         for (direction = READ; direction <= WRITE; direction++) {
2076                 struct channel *ch = priv->channel[direction];
2077                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2078         }
2079 }
2080
2081 /**
2082  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2083  *
2084  * fi           An instance of an interface statemachine.
2085  * event        The event, just happened.
2086  * arg          Generic pointer, casted from struct net_device * upon call.
2087  */
2088 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2089 {
2090         int direction;
2091         struct net_device *dev = arg;
2092         struct ctcm_priv *priv = dev->ml_priv;
2093
2094         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2095
2096         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2097         for (direction = READ; direction <= WRITE; direction++) {
2098                 struct channel *ch = priv->channel[direction];
2099                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2100                 ch->th_seq_num = 0x00;
2101                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2102                                 __func__, ch->th_seq_num);
2103         }
2104         if (IS_MPC(priv))
2105                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2106 }
2107
2108 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2109 {
2110         int restart_timer;
2111         struct net_device *dev = arg;
2112         struct ctcm_priv *priv = dev->ml_priv;
2113
2114         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2115
2116         if (IS_MPC(priv)) {
2117                 restart_timer = CTCM_TIME_1_SEC;
2118         } else {
2119                 restart_timer = CTCM_TIME_5_SEC;
2120         }
2121         dev_info(&dev->dev, "Restarting device\n");
2122
2123         dev_action_stop(fi, event, arg);
2124         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2125         if (IS_MPC(priv))
2126                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2127
2128         /* going back into start sequence too quickly can         */
2129         /* result in the other side becoming unreachable   due    */
2130         /* to sense reported when IO is aborted                   */
2131         fsm_addtimer(&priv->restart_timer, restart_timer,
2132                         DEV_EVENT_START, dev);
2133 }
2134
2135 /**
2136  * Called from channel statemachine
2137  * when a channel is up and running.
2138  *
2139  * fi           An instance of an interface statemachine.
2140  * event        The event, just happened.
2141  * arg          Generic pointer, casted from struct net_device * upon call.
2142  */
2143 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2144 {
2145         struct net_device *dev = arg;
2146         struct ctcm_priv *priv = dev->ml_priv;
2147         int dev_stat = fsm_getstate(fi);
2148
2149         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2150                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2151                                 dev->name, dev->ml_priv, dev_stat, event);
2152
2153         switch (fsm_getstate(fi)) {
2154         case DEV_STATE_STARTWAIT_RXTX:
2155                 if (event == DEV_EVENT_RXUP)
2156                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2157                 else
2158                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2159                 break;
2160         case DEV_STATE_STARTWAIT_RX:
2161                 if (event == DEV_EVENT_RXUP) {
2162                         fsm_newstate(fi, DEV_STATE_RUNNING);
2163                         dev_info(&dev->dev,
2164                                 "Connected with remote side\n");
2165                         ctcm_clear_busy(dev);
2166                 }
2167                 break;
2168         case DEV_STATE_STARTWAIT_TX:
2169                 if (event == DEV_EVENT_TXUP) {
2170                         fsm_newstate(fi, DEV_STATE_RUNNING);
2171                         dev_info(&dev->dev,
2172                                 "Connected with remote side\n");
2173                         ctcm_clear_busy(dev);
2174                 }
2175                 break;
2176         case DEV_STATE_STOPWAIT_TX:
2177                 if (event == DEV_EVENT_RXUP)
2178                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2179                 break;
2180         case DEV_STATE_STOPWAIT_RX:
2181                 if (event == DEV_EVENT_TXUP)
2182                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2183                 break;
2184         }
2185
2186         if (IS_MPC(priv)) {
2187                 if (event == DEV_EVENT_RXUP)
2188                         mpc_channel_action(priv->channel[READ],
2189                                 READ, MPC_CHANNEL_ADD);
2190                 else
2191                         mpc_channel_action(priv->channel[WRITE],
2192                                 WRITE, MPC_CHANNEL_ADD);
2193         }
2194 }
2195
2196 /**
2197  * Called from device statemachine
2198  * when a channel has been shutdown.
2199  *
2200  * fi           An instance of an interface statemachine.
2201  * event        The event, just happened.
2202  * arg          Generic pointer, casted from struct net_device * upon call.
2203  */
2204 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2205 {
2206
2207         struct net_device *dev = arg;
2208         struct ctcm_priv *priv = dev->ml_priv;
2209
2210         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2211
2212         switch (fsm_getstate(fi)) {
2213         case DEV_STATE_RUNNING:
2214                 if (event == DEV_EVENT_TXDOWN)
2215                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2216                 else
2217                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2218                 break;
2219         case DEV_STATE_STARTWAIT_RX:
2220                 if (event == DEV_EVENT_TXDOWN)
2221                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2222                 break;
2223         case DEV_STATE_STARTWAIT_TX:
2224                 if (event == DEV_EVENT_RXDOWN)
2225                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2226                 break;
2227         case DEV_STATE_STOPWAIT_RXTX:
2228                 if (event == DEV_EVENT_TXDOWN)
2229                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2230                 else
2231                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2232                 break;
2233         case DEV_STATE_STOPWAIT_RX:
2234                 if (event == DEV_EVENT_RXDOWN)
2235                         fsm_newstate(fi, DEV_STATE_STOPPED);
2236                 break;
2237         case DEV_STATE_STOPWAIT_TX:
2238                 if (event == DEV_EVENT_TXDOWN)
2239                         fsm_newstate(fi, DEV_STATE_STOPPED);
2240                 break;
2241         }
2242         if (IS_MPC(priv)) {
2243                 if (event == DEV_EVENT_RXDOWN)
2244                         mpc_channel_action(priv->channel[READ],
2245                                 READ, MPC_CHANNEL_REMOVE);
2246                 else
2247                         mpc_channel_action(priv->channel[WRITE],
2248                                 WRITE, MPC_CHANNEL_REMOVE);
2249         }
2250 }
2251
2252 const fsm_node dev_fsm[] = {
2253         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2254         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2255         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2256         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2257         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2258         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2259         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2260         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2261         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2262         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2263         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2264         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2265         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2266         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2267         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2268         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2269         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2270         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2271         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2272         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2273         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2274         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2275         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2276         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2277         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2278         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2279         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2280         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2281         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2282         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2283         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2284         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2285         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2286         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2287         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2288         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2289         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2290 };
2291
2292 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2293
2294 /* --- This is the END my friend --- */
2295