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