drivers/s390/net/ctcm_fsms.c

   1 /*
   2  * Copyright IBM Corp. 2001, 2007
   3  * Authors:     Fritz Elfert (felfert@millenux.com)
   4  *              Peter Tiedemann (ptiedem@de.ibm.com)
   5  *      MPC additions :
   6  *              Belinda Thompson (belindat@us.ibm.com)
   7  *              Andy Richter (richtera@us.ibm.com)
   8  */
   9
  10 #undef DEBUG
  11 #undef DEBUGDATA
  12 #undef DEBUGCCW
  13
  14 #define KMSG_COMPONENT "ctcm"
  15 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  16
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/kernel.h>
  20 #include <linux/slab.h>
  21 #include <linux/errno.h>
  22 #include <linux/types.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/timer.h>
  25 #include <linux/bitops.h>
  26
  27 #include <linux/signal.h>
  28 #include <linux/string.h>
  29
  30 #include <linux/ip.h>
  31 #include <linux/if_arp.h>
  32 #include <linux/tcp.h>
  33 #include <linux/skbuff.h>
  34 #include <linux/ctype.h>
  35 #include <net/dst.h>
  36
  37 #include <linux/io.h>
  38 #include <asm/ccwdev.h>
  39 #include <asm/ccwgroup.h>
  40 #include <linux/uaccess.h>
  41
  42 #include <asm/idals.h>
  43
  44 #include "fsm.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 preceding 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                 pr_info("%s: The communication peer is busy\n",
 198                         ch->id);
 199                 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
 200                 break;
 201         case -ENODEV:
 202                 pr_err("%s: The specified target device is not valid\n",
 203                        ch->id);
 204                 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
 205                 break;
 206         default:
 207                 pr_err("An I/O operation resulted in error %04x\n",
 208                        rc);
 209                 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
 210         }
 211 }
 212
 213 void ctcm_purge_skb_queue(struct sk_buff_head *q)
 214 {
 215         struct sk_buff *skb;
 216
 217         CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
 218
 219         while ((skb = skb_dequeue(q))) {
 220                 atomic_dec(&skb->users);
 221                 dev_kfree_skb_any(skb);
 222         }
 223 }
 224
 225 /**
 226  * NOP action for statemachines
 227  */
 228 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
 229 {
 230 }
 231
 232 /*
 233  * Actions for channel - statemachines.
 234  */
 235
 236 /**
 237  * Normal data has been send. Free the corresponding
 238  * skb (it's in io_queue), reset dev->tbusy and
 239  * revert to idle state.
 240  *
 241  * fi           An instance of a channel statemachine.
 242  * event        The event, just happened.
 243  * arg          Generic pointer, casted from channel * upon call.
 244  */
 245 static void chx_txdone(fsm_instance *fi, int event, void *arg)
 246 {
 247         struct channel *ch = arg;
 248         struct net_device *dev = ch->netdev;
 249         struct ctcm_priv *priv = dev->ml_priv;
 250         struct sk_buff *skb;
 251         int first = 1;
 252         int i;
 253         unsigned long duration;
 254         struct timespec done_stamp = current_kernel_time(); /* xtime */
 255
 256         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 257
 258         duration =
 259             (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
 260             (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
 261         if (duration > ch->prof.tx_time)
 262                 ch->prof.tx_time = duration;
 263
 264         if (ch->irb->scsw.cmd.count != 0)
 265                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 266                         "%s(%s): TX not complete, remaining %d bytes",
 267                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
 268         fsm_deltimer(&ch->timer);
 269         while ((skb = skb_dequeue(&ch->io_queue))) {
 270                 priv->stats.tx_packets++;
 271                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 272                 if (first) {
 273                         priv->stats.tx_bytes += 2;
 274                         first = 0;
 275                 }
 276                 atomic_dec(&skb->users);
 277                 dev_kfree_skb_irq(skb);
 278         }
 279         spin_lock(&ch->collect_lock);
 280         clear_normalized_cda(&ch->ccw[4]);
 281         if (ch->collect_len > 0) {
 282                 int rc;
 283
 284                 if (ctcm_checkalloc_buffer(ch)) {
 285                         spin_unlock(&ch->collect_lock);
 286                         return;
 287                 }
 288                 ch->trans_skb->data = ch->trans_skb_data;
 289                 skb_reset_tail_pointer(ch->trans_skb);
 290                 ch->trans_skb->len = 0;
 291                 if (ch->prof.maxmulti < (ch->collect_len + 2))
 292                         ch->prof.maxmulti = ch->collect_len + 2;
 293                 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
 294                         ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
 295                 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
 296                 i = 0;
 297                 while ((skb = skb_dequeue(&ch->collect_queue))) {
 298                         skb_copy_from_linear_data(skb,
 299                                 skb_put(ch->trans_skb, skb->len), skb->len);
 300                         priv->stats.tx_packets++;
 301                         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 302                         atomic_dec(&skb->users);
 303                         dev_kfree_skb_irq(skb);
 304                         i++;
 305                 }
 306                 ch->collect_len = 0;
 307                 spin_unlock(&ch->collect_lock);
 308                 ch->ccw[1].count = ch->trans_skb->len;
 309                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 310                 ch->prof.send_stamp = current_kernel_time(); /* xtime */
 311                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 312                                                 (unsigned long)ch, 0xff, 0);
 313                 ch->prof.doios_multi++;
 314                 if (rc != 0) {
 315                         priv->stats.tx_dropped += i;
 316                         priv->stats.tx_errors += i;
 317                         fsm_deltimer(&ch->timer);
 318                         ctcm_ccw_check_rc(ch, rc, "chained TX");
 319                 }
 320         } else {
 321                 spin_unlock(&ch->collect_lock);
 322                 fsm_newstate(fi, CTC_STATE_TXIDLE);
 323         }
 324         ctcm_clear_busy_do(dev);
 325 }
 326
 327 /**
 328  * Initial data is sent.
 329  * Notify device statemachine that we are up and
 330  * running.
 331  *
 332  * fi           An instance of a channel statemachine.
 333  * event        The event, just happened.
 334  * arg          Generic pointer, casted from channel * upon call.
 335  */
 336 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
 337 {
 338         struct channel *ch = arg;
 339         struct net_device *dev = ch->netdev;
 340         struct ctcm_priv *priv = dev->ml_priv;
 341
 342         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 343
 344         fsm_deltimer(&ch->timer);
 345         fsm_newstate(fi, CTC_STATE_TXIDLE);
 346         fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
 347 }
 348
 349 /**
 350  * Got normal data, check for sanity, queue it up, allocate new buffer
 351  * trigger bottom half, and initiate next read.
 352  *
 353  * fi           An instance of a channel statemachine.
 354  * event        The event, just happened.
 355  * arg          Generic pointer, casted from channel * upon call.
 356  */
 357 static void chx_rx(fsm_instance *fi, int event, void *arg)
 358 {
 359         struct channel *ch = arg;
 360         struct net_device *dev = ch->netdev;
 361         struct ctcm_priv *priv = dev->ml_priv;
 362         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
 363         struct sk_buff *skb = ch->trans_skb;
 364         __u16 block_len = *((__u16 *)skb->data);
 365         int check_len;
 366         int rc;
 367
 368         fsm_deltimer(&ch->timer);
 369         if (len < 8) {
 370                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 371                         "%s(%s): got packet with length %d < 8\n",
 372                                         CTCM_FUNTAIL, dev->name, len);
 373                 priv->stats.rx_dropped++;
 374                 priv->stats.rx_length_errors++;
 375                                                 goto again;
 376         }
 377         if (len > ch->max_bufsize) {
 378                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 379                         "%s(%s): got packet with length %d > %d\n",
 380                                 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
 381                 priv->stats.rx_dropped++;
 382                 priv->stats.rx_length_errors++;
 383                                                 goto again;
 384         }
 385
 386         /*
 387          * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
 388          */
 389         switch (ch->protocol) {
 390         case CTCM_PROTO_S390:
 391         case CTCM_PROTO_OS390:
 392                 check_len = block_len + 2;
 393                 break;
 394         default:
 395                 check_len = block_len;
 396                 break;
 397         }
 398         if ((len < block_len) || (len > check_len)) {
 399                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 400                         "%s(%s): got block length %d != rx length %d\n",
 401                                 CTCM_FUNTAIL, dev->name, block_len, len);
 402                 if (do_debug)
 403                         ctcmpc_dump_skb(skb, 0);
 404
 405                 *((__u16 *)skb->data) = len;
 406                 priv->stats.rx_dropped++;
 407                 priv->stats.rx_length_errors++;
 408                                                 goto again;
 409         }
 410         if (block_len > 2) {
 411                 *((__u16 *)skb->data) = block_len - 2;
 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) == CTCM_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->ml_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) == CTCM_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) == CTCM_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) == CTCM_READ) &&
 497             (ch->protocol == CTCM_PROTO_S390)) {
 498                 struct net_device *dev = ch->netdev;
 499                 struct ctcm_priv *priv = dev->ml_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->ml_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) == CTCM_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) == CTCM_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) == CTCM_READ) ?
 624                                 "RX" : "TX");
 625         }
 626         ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
 627         ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 628         ch->ccw[0].count = 0;
 629         ch->ccw[0].cda = 0;
 630         ch->ccw[2].cmd_code = CCW_CMD_NOOP;     /* jointed CE + DE */
 631         ch->ccw[2].flags = CCW_FLAG_SLI;
 632         ch->ccw[2].count = 0;
 633         ch->ccw[2].cda = 0;
 634         memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
 635         ch->ccw[4].cda = 0;
 636         ch->ccw[4].flags &= ~CCW_FLAG_IDA;
 637
 638         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 639         fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
 640         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 641         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 642         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 643         if (rc != 0) {
 644                 if (rc != -EBUSY)
 645                         fsm_deltimer(&ch->timer);
 646                 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
 647         }
 648 }
 649
 650 /**
 651  * Shutdown a channel.
 652  *
 653  * fi           An instance of a channel statemachine.
 654  * event        The event, just happened.
 655  * arg          Generic pointer, casted from channel * upon call.
 656  */
 657 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
 658 {
 659         struct channel *ch = arg;
 660         unsigned long saveflags = 0;
 661         int rc;
 662         int oldstate;
 663
 664         fsm_deltimer(&ch->timer);
 665         if (IS_MPC(ch))
 666                 fsm_deltimer(&ch->sweep_timer);
 667
 668         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 669
 670         if (event == CTC_EVENT_STOP)    /* only for STOP not yet locked */
 671                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 672                         /* Such conditional locking is undeterministic in
 673                          * static view. => ignore sparse warnings here. */
 674         oldstate = fsm_getstate(fi);
 675         fsm_newstate(fi, CTC_STATE_TERM);
 676         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 677
 678         if (event == CTC_EVENT_STOP)
 679                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 680                         /* see remark above about conditional locking */
 681
 682         if (rc != 0 && rc != -EBUSY) {
 683                 fsm_deltimer(&ch->timer);
 684                 if (event != CTC_EVENT_STOP) {
 685                         fsm_newstate(fi, oldstate);
 686                         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
 687                 }
 688         }
 689 }
 690
 691 /**
 692  * Cleanup helper for chx_fail and chx_stopped
 693  * cleanup channels queue and notify interface statemachine.
 694  *
 695  * fi           An instance of a channel statemachine.
 696  * state        The next state (depending on caller).
 697  * ch           The channel to operate on.
 698  */
 699 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
 700                 struct channel *ch)
 701 {
 702         struct net_device *dev = ch->netdev;
 703         struct ctcm_priv *priv = dev->ml_priv;
 704
 705         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
 706                         "%s(%s): %s[%d]\n",
 707                         CTCM_FUNTAIL, dev->name, ch->id, state);
 708
 709         fsm_deltimer(&ch->timer);
 710         if (IS_MPC(ch))
 711                 fsm_deltimer(&ch->sweep_timer);
 712
 713         fsm_newstate(fi, state);
 714         if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
 715                 clear_normalized_cda(&ch->ccw[1]);
 716                 dev_kfree_skb_any(ch->trans_skb);
 717                 ch->trans_skb = NULL;
 718         }
 719
 720         ch->th_seg = 0x00;
 721         ch->th_seq_num = 0x00;
 722         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 723                 skb_queue_purge(&ch->io_queue);
 724                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 725         } else {
 726                 ctcm_purge_skb_queue(&ch->io_queue);
 727                 if (IS_MPC(ch))
 728                         ctcm_purge_skb_queue(&ch->sweep_queue);
 729                 spin_lock(&ch->collect_lock);
 730                 ctcm_purge_skb_queue(&ch->collect_queue);
 731                 ch->collect_len = 0;
 732                 spin_unlock(&ch->collect_lock);
 733                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 734         }
 735 }
 736
 737 /**
 738  * A channel has successfully been halted.
 739  * Cleanup it's queue and notify interface statemachine.
 740  *
 741  * fi           An instance of a channel statemachine.
 742  * event        The event, just happened.
 743  * arg          Generic pointer, casted from channel * upon call.
 744  */
 745 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
 746 {
 747         ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
 748 }
 749
 750 /**
 751  * A stop command from device statemachine arrived and we are in
 752  * not operational mode. Set state to stopped.
 753  *
 754  * fi           An instance of a channel statemachine.
 755  * event        The event, just happened.
 756  * arg          Generic pointer, casted from channel * upon call.
 757  */
 758 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
 759 {
 760         fsm_newstate(fi, CTC_STATE_STOPPED);
 761 }
 762
 763 /**
 764  * A machine check for no path, not operational status or gone device has
 765  * happened.
 766  * Cleanup queue and notify interface statemachine.
 767  *
 768  * fi           An instance of a channel statemachine.
 769  * event        The event, just happened.
 770  * arg          Generic pointer, casted from channel * upon call.
 771  */
 772 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
 773 {
 774         ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
 775 }
 776
 777 /**
 778  * Handle error during setup of channel.
 779  *
 780  * fi           An instance of a channel statemachine.
 781  * event        The event, just happened.
 782  * arg          Generic pointer, casted from channel * upon call.
 783  */
 784 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
 785 {
 786         struct channel *ch = arg;
 787         struct net_device *dev = ch->netdev;
 788         struct ctcm_priv *priv = dev->ml_priv;
 789
 790         /*
 791          * Special case: Got UC_RCRESET on setmode.
 792          * This means that remote side isn't setup. In this case
 793          * simply retry after some 10 secs...
 794          */
 795         if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
 796             ((event == CTC_EVENT_UC_RCRESET) ||
 797              (event == CTC_EVENT_UC_RSRESET))) {
 798                 fsm_newstate(fi, CTC_STATE_STARTRETRY);
 799                 fsm_deltimer(&ch->timer);
 800                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 801                 if (!IS_MPC(ch) &&
 802                     (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
 803                         int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 804                         if (rc != 0)
 805                                 ctcm_ccw_check_rc(ch, rc,
 806                                         "HaltIO in chx_setuperr");
 807                 }
 808                 return;
 809         }
 810
 811         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
 812                 "%s(%s) : %s error during %s channel setup state=%s\n",
 813                 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
 814                 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
 815                 fsm_getstate_str(fi));
 816
 817         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 818                 fsm_newstate(fi, CTC_STATE_RXERR);
 819                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 820         } else {
 821                 fsm_newstate(fi, CTC_STATE_TXERR);
 822                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 823         }
 824 }
 825
 826 /**
 827  * Restart a channel after an error.
 828  *
 829  * fi           An instance of a channel statemachine.
 830  * event        The event, just happened.
 831  * arg          Generic pointer, casted from channel * upon call.
 832  */
 833 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
 834 {
 835         struct channel *ch = arg;
 836         struct net_device *dev = ch->netdev;
 837         unsigned long saveflags = 0;
 838         int oldstate;
 839         int rc;
 840
 841         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 842                 "%s: %s[%d] of %s\n",
 843                         CTCM_FUNTAIL, ch->id, event, dev->name);
 844
 845         fsm_deltimer(&ch->timer);
 846
 847         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 848         oldstate = fsm_getstate(fi);
 849         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 850         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
 851                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 852                         /* Such conditional locking is a known problem for
 853                          * sparse because its undeterministic in static view.
 854                          * Warnings should be ignored here. */
 855         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 856         if (event == CTC_EVENT_TIMER)
 857                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 858         if (rc != 0) {
 859                 if (rc != -EBUSY) {
 860                     fsm_deltimer(&ch->timer);
 861                     fsm_newstate(fi, oldstate);
 862                 }
 863                 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
 864         }
 865 }
 866
 867 /**
 868  * Handle error during RX initial handshake (exchange of
 869  * 0-length block header)
 870  *
 871  * fi           An instance of a channel statemachine.
 872  * event        The event, just happened.
 873  * arg          Generic pointer, casted from channel * upon call.
 874  */
 875 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
 876 {
 877         struct channel *ch = arg;
 878         struct net_device *dev = ch->netdev;
 879         struct ctcm_priv *priv = dev->ml_priv;
 880
 881         if (event == CTC_EVENT_TIMER) {
 882                 if (!IS_MPCDEV(dev))
 883                         /* TODO : check if MPC deletes timer somewhere */
 884                         fsm_deltimer(&ch->timer);
 885                 if (ch->retry++ < 3)
 886                         ctcm_chx_restart(fi, event, arg);
 887                 else {
 888                         fsm_newstate(fi, CTC_STATE_RXERR);
 889                         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 890                 }
 891         } else {
 892                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 893                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 894                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 895
 896                 dev_warn(&dev->dev,
 897                         "Initialization failed with RX/TX init handshake "
 898                         "error %s\n", ctc_ch_event_names[event]);
 899         }
 900 }
 901
 902 /**
 903  * Notify device statemachine if we gave up initialization
 904  * of RX channel.
 905  *
 906  * fi           An instance of a channel statemachine.
 907  * event        The event, just happened.
 908  * arg          Generic pointer, casted from channel * upon call.
 909  */
 910 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
 911 {
 912         struct channel *ch = arg;
 913         struct net_device *dev = ch->netdev;
 914         struct ctcm_priv *priv = dev->ml_priv;
 915
 916         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 917                         "%s(%s): RX %s busy, init. fail",
 918                                 CTCM_FUNTAIL, dev->name, ch->id);
 919         fsm_newstate(fi, CTC_STATE_RXERR);
 920         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 921 }
 922
 923 /**
 924  * Handle RX Unit check remote reset (remote disconnected)
 925  *
 926  * fi           An instance of a channel statemachine.
 927  * event        The event, just happened.
 928  * arg          Generic pointer, casted from channel * upon call.
 929  */
 930 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
 931 {
 932         struct channel *ch = arg;
 933         struct channel *ch2;
 934         struct net_device *dev = ch->netdev;
 935         struct ctcm_priv *priv = dev->ml_priv;
 936
 937         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 938                         "%s: %s: remote disconnect - re-init ...",
 939                                 CTCM_FUNTAIL, dev->name);
 940         fsm_deltimer(&ch->timer);
 941         /*
 942          * Notify device statemachine
 943          */
 944         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 945         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 946
 947         fsm_newstate(fi, CTC_STATE_DTERM);
 948         ch2 = priv->channel[CTCM_WRITE];
 949         fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
 950
 951         ccw_device_halt(ch->cdev, (unsigned long)ch);
 952         ccw_device_halt(ch2->cdev, (unsigned long)ch2);
 953 }
 954
 955 /**
 956  * Handle error during TX channel initialization.
 957  *
 958  * fi           An instance of a channel statemachine.
 959  * event        The event, just happened.
 960  * arg          Generic pointer, casted from channel * upon call.
 961  */
 962 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
 963 {
 964         struct channel *ch = arg;
 965         struct net_device *dev = ch->netdev;
 966         struct ctcm_priv *priv = dev->ml_priv;
 967
 968         if (event == CTC_EVENT_TIMER) {
 969                 fsm_deltimer(&ch->timer);
 970                 if (ch->retry++ < 3)
 971                         ctcm_chx_restart(fi, event, arg);
 972                 else {
 973                         fsm_newstate(fi, CTC_STATE_TXERR);
 974                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 975                 }
 976         } else {
 977                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 978                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 979                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 980
 981                 dev_warn(&dev->dev,
 982                         "Initialization failed with RX/TX init handshake "
 983                         "error %s\n", ctc_ch_event_names[event]);
 984         }
 985 }
 986
 987 /**
 988  * Handle TX timeout by retrying operation.
 989  *
 990  * fi           An instance of a channel statemachine.
 991  * event        The event, just happened.
 992  * arg          Generic pointer, casted from channel * upon call.
 993  */
 994 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
 995 {
 996         struct channel *ch = arg;
 997         struct net_device *dev = ch->netdev;
 998         struct ctcm_priv *priv = dev->ml_priv;
 999         struct sk_buff *skb;
1000
1001         CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1002                         __func__, smp_processor_id(), ch, ch->id);
1003
1004         fsm_deltimer(&ch->timer);
1005         if (ch->retry++ > 3) {
1006                 struct mpc_group *gptr = priv->mpcg;
1007                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1008                                 "%s: %s: retries exceeded",
1009                                         CTCM_FUNTAIL, ch->id);
1010                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1011                 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1012                         use gptr as mpc indicator */
1013                 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1014                         ctcm_chx_restart(fi, event, arg);
1015                                 goto done;
1016         }
1017
1018         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1019                         "%s : %s: retry %d",
1020                                 CTCM_FUNTAIL, ch->id, ch->retry);
1021         skb = skb_peek(&ch->io_queue);
1022         if (skb) {
1023                 int rc = 0;
1024                 unsigned long saveflags = 0;
1025                 clear_normalized_cda(&ch->ccw[4]);
1026                 ch->ccw[4].count = skb->len;
1027                 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1028                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1029                                 "%s: %s: IDAL alloc failed",
1030                                                 CTCM_FUNTAIL, ch->id);
1031                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1032                         ctcm_chx_restart(fi, event, arg);
1033                                 goto done;
1034                 }
1035                 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1036                 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1037                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1038                         /* Such conditional locking is a known problem for
1039                          * sparse because its undeterministic in static view.
1040                          * Warnings should be ignored here. */
1041                 if (do_debug_ccw)
1042                         ctcmpc_dumpit((char *)&ch->ccw[3],
1043                                         sizeof(struct ccw1) * 3);
1044
1045                 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1046                                                 (unsigned long)ch, 0xff, 0);
1047                 if (event == CTC_EVENT_TIMER)
1048                         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1049                                         saveflags);
1050                 if (rc != 0) {
1051                         fsm_deltimer(&ch->timer);
1052                         ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1053                         ctcm_purge_skb_queue(&ch->io_queue);
1054                 }
1055         }
1056 done:
1057         return;
1058 }
1059
1060 /**
1061  * Handle fatal errors during an I/O command.
1062  *
1063  * fi           An instance of a channel statemachine.
1064  * event        The event, just happened.
1065  * arg          Generic pointer, casted from channel * upon call.
1066  */
1067 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1068 {
1069         struct channel *ch = arg;
1070         struct net_device *dev = ch->netdev;
1071         struct ctcm_priv *priv = dev->ml_priv;
1072         int rd = CHANNEL_DIRECTION(ch->flags);
1073
1074         fsm_deltimer(&ch->timer);
1075         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1076                 "%s: %s: %s unrecoverable channel error",
1077                         CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1078
1079         if (IS_MPC(ch)) {
1080                 priv->stats.tx_dropped++;
1081                 priv->stats.tx_errors++;
1082         }
1083         if (rd == CTCM_READ) {
1084                 fsm_newstate(fi, CTC_STATE_RXERR);
1085                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1086         } else {
1087                 fsm_newstate(fi, CTC_STATE_TXERR);
1088                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1089         }
1090 }
1091
1092 /*
1093  * The ctcm statemachine for a channel.
1094  */
1095 const fsm_node ch_fsm[] = {
1096         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1097         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1098         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1099         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1100
1101         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1102         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1103         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1104         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1105         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1106
1107         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1108         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1109         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1110         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1111         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1112         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1113
1114         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1115         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1116         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1117         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1118
1119         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1120         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1121         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      chx_firstio  },
1122         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1123         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1124         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1125         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1126         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1127
1128         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1129         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1130         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      chx_rxidle  },
1131         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1132         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1133         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1134         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1135         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1136         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      chx_firstio  },
1137         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1138
1139         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1140         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1141         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      chx_rx  },
1142         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1143         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1144         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1145         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      chx_rx  },
1146
1147         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1148         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1149         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1150         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1151         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1152         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
1153         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1154         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1155
1156         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1157         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1158         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      chx_firstio  },
1159         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1160         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1161         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1162         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1163
1164         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
1165         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
1166         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
1167         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1168         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1169         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1170
1171         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1172         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
1173         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1174         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1175         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1176         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1177
1178         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
1179         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
1180         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      chx_txdone  },
1181         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_txretry  },
1182         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_txretry  },
1183         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
1184         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1185         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1186
1187         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1188         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1189         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1190         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1191 };
1192
1193 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1194
1195 /*
1196  * MPC actions for mpc channel statemachine
1197  * handling of MPC protocol requires extra
1198  * statemachine and actions which are prefixed ctcmpc_ .
1199  * The ctc_ch_states and ctc_ch_state_names,
1200  * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1201  * which are expanded by some elements.
1202  */
1203
1204 /*
1205  * Actions for mpc channel statemachine.
1206  */
1207
1208 /**
1209  * Normal data has been send. Free the corresponding
1210  * skb (it's in io_queue), reset dev->tbusy and
1211  * revert to idle state.
1212  *
1213  * fi           An instance of a channel statemachine.
1214  * event        The event, just happened.
1215  * arg          Generic pointer, casted from channel * upon call.
1216  */
1217 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1218 {
1219         struct channel          *ch = arg;
1220         struct net_device       *dev = ch->netdev;
1221         struct ctcm_priv        *priv = dev->ml_priv;
1222         struct mpc_group        *grp = priv->mpcg;
1223         struct sk_buff          *skb;
1224         int             first = 1;
1225         int             i;
1226         __u32           data_space;
1227         unsigned long   duration;
1228         struct sk_buff  *peekskb;
1229         int             rc;
1230         struct th_header *header;
1231         struct pdu      *p_header;
1232         struct timespec done_stamp = current_kernel_time(); /* xtime */
1233
1234         CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1235                         __func__, dev->name, smp_processor_id());
1236
1237         duration =
1238                 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1239                 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1240         if (duration > ch->prof.tx_time)
1241                 ch->prof.tx_time = duration;
1242
1243         if (ch->irb->scsw.cmd.count != 0)
1244                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1245                         "%s(%s): TX not complete, remaining %d bytes",
1246                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1247         fsm_deltimer(&ch->timer);
1248         while ((skb = skb_dequeue(&ch->io_queue))) {
1249                 priv->stats.tx_packets++;
1250                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1251                 if (first) {
1252                         priv->stats.tx_bytes += 2;
1253                         first = 0;
1254                 }
1255                 atomic_dec(&skb->users);
1256                 dev_kfree_skb_irq(skb);
1257         }
1258         spin_lock(&ch->collect_lock);
1259         clear_normalized_cda(&ch->ccw[4]);
1260         if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1261                 spin_unlock(&ch->collect_lock);
1262                 fsm_newstate(fi, CTC_STATE_TXIDLE);
1263                                 goto done;
1264         }
1265
1266         if (ctcm_checkalloc_buffer(ch)) {
1267                 spin_unlock(&ch->collect_lock);
1268                                 goto done;
1269         }
1270         ch->trans_skb->data = ch->trans_skb_data;
1271         skb_reset_tail_pointer(ch->trans_skb);
1272         ch->trans_skb->len = 0;
1273         if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1274                 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1275         if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1276                 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1277         i = 0;
1278         p_header = NULL;
1279         data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1280
1281         CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1282                        " data_space:%04x\n",
1283                        __func__, data_space);
1284
1285         while ((skb = skb_dequeue(&ch->collect_queue))) {
1286                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1287                 p_header = (struct pdu *)
1288                         (skb_tail_pointer(ch->trans_skb) - skb->len);
1289                 p_header->pdu_flag = 0x00;
1290                 if (skb->protocol == ntohs(ETH_P_SNAP))
1291                         p_header->pdu_flag |= 0x60;
1292                 else
1293                         p_header->pdu_flag |= 0x20;
1294
1295                 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1296                                 __func__, ch->trans_skb->len);
1297                 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1298                                 " to 32 bytes sent to vtam\n", __func__);
1299                 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1300
1301                 ch->collect_len -= skb->len;
1302                 data_space -= skb->len;
1303                 priv->stats.tx_packets++;
1304                 priv->stats.tx_bytes += skb->len;
1305                 atomic_dec(&skb->users);
1306                 dev_kfree_skb_any(skb);
1307                 peekskb = skb_peek(&ch->collect_queue);
1308                 if (peekskb->len > data_space)
1309                         break;
1310                 i++;
1311         }
1312         /* p_header points to the last one we handled */
1313         if (p_header)
1314                 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1315         header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1316         if (!header) {
1317                 spin_unlock(&ch->collect_lock);
1318                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1319                                 goto done;
1320         }
1321         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
1322         ch->th_seq_num++;
1323         header->th_seq_num = ch->th_seq_num;
1324
1325         CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1326                                         __func__, ch->th_seq_num);
1327
1328         memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1329                 TH_HEADER_LENGTH);      /* put the TH on the packet */
1330
1331         kfree(header);
1332
1333         CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1334                        __func__, ch->trans_skb->len);
1335         CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1336                         "data to vtam from collect_q\n", __func__);
1337         CTCM_D3_DUMP((char *)ch->trans_skb->data,
1338                                 min_t(int, ch->trans_skb->len, 50));
1339
1340         spin_unlock(&ch->collect_lock);
1341         clear_normalized_cda(&ch->ccw[1]);
1342
1343         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1344                         (void *)(unsigned long)ch->ccw[1].cda,
1345                         ch->trans_skb->data);
1346         ch->ccw[1].count = ch->max_bufsize;
1347
1348         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1349                 dev_kfree_skb_any(ch->trans_skb);
1350                 ch->trans_skb = NULL;
1351                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1352                         "%s: %s: IDAL alloc failed",
1353                                 CTCM_FUNTAIL, ch->id);
1354                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1355                 return;
1356         }
1357
1358         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1359                         (void *)(unsigned long)ch->ccw[1].cda,
1360                         ch->trans_skb->data);
1361
1362         ch->ccw[1].count = ch->trans_skb->len;
1363         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1364         ch->prof.send_stamp = current_kernel_time(); /* xtime */
1365         if (do_debug_ccw)
1366                 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1367         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1368                                         (unsigned long)ch, 0xff, 0);
1369         ch->prof.doios_multi++;
1370         if (rc != 0) {
1371                 priv->stats.tx_dropped += i;
1372                 priv->stats.tx_errors += i;
1373                 fsm_deltimer(&ch->timer);
1374                 ctcm_ccw_check_rc(ch, rc, "chained TX");
1375         }
1376 done:
1377         ctcm_clear_busy(dev);
1378         return;
1379 }
1380
1381 /**
1382  * Got normal data, check for sanity, queue it up, allocate new buffer
1383  * trigger bottom half, and initiate next read.
1384  *
1385  * fi           An instance of a channel statemachine.
1386  * event        The event, just happened.
1387  * arg          Generic pointer, casted from channel * upon call.
1388  */
1389 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1390 {
1391         struct channel          *ch = arg;
1392         struct net_device       *dev = ch->netdev;
1393         struct ctcm_priv        *priv = dev->ml_priv;
1394         struct mpc_group        *grp = priv->mpcg;
1395         struct sk_buff          *skb = ch->trans_skb;
1396         struct sk_buff          *new_skb;
1397         unsigned long           saveflags = 0;  /* avoids compiler warning */
1398         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1399
1400         CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1401                         CTCM_FUNTAIL, dev->name, smp_processor_id(),
1402                                 ch->id, ch->max_bufsize, len);
1403         fsm_deltimer(&ch->timer);
1404
1405         if (skb == NULL) {
1406                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1407                         "%s(%s): TRANS_SKB = NULL",
1408                                 CTCM_FUNTAIL, dev->name);
1409                         goto again;
1410         }
1411
1412         if (len < TH_HEADER_LENGTH) {
1413                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1414                                 "%s(%s): packet length %d to short",
1415                                         CTCM_FUNTAIL, dev->name, len);
1416                 priv->stats.rx_dropped++;
1417                 priv->stats.rx_length_errors++;
1418         } else {
1419                 /* must have valid th header or game over */
1420                 __u32   block_len = len;
1421                 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1422                 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1423
1424                 if (new_skb == NULL) {
1425                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1426                                 "%s(%d): skb allocation failed",
1427                                                 CTCM_FUNTAIL, dev->name);
1428                         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1429                                         goto again;
1430                 }
1431                 switch (fsm_getstate(grp->fsm)) {
1432                 case MPCG_STATE_RESET:
1433                 case MPCG_STATE_INOP:
1434                         dev_kfree_skb_any(new_skb);
1435                         break;
1436                 case MPCG_STATE_FLOWC:
1437                 case MPCG_STATE_READY:
1438                         memcpy(skb_put(new_skb, block_len),
1439                                                skb->data, block_len);
1440                         skb_queue_tail(&ch->io_queue, new_skb);
1441                         tasklet_schedule(&ch->ch_tasklet);
1442                         break;
1443                 default:
1444                         memcpy(skb_put(new_skb, len), skb->data, len);
1445                         skb_queue_tail(&ch->io_queue, new_skb);
1446                         tasklet_hi_schedule(&ch->ch_tasklet);
1447                         break;
1448                 }
1449         }
1450
1451 again:
1452         switch (fsm_getstate(grp->fsm)) {
1453         int rc, dolock;
1454         case MPCG_STATE_FLOWC:
1455         case MPCG_STATE_READY:
1456                 if (ctcm_checkalloc_buffer(ch))
1457                         break;
1458                 ch->trans_skb->data = ch->trans_skb_data;
1459                 skb_reset_tail_pointer(ch->trans_skb);
1460                 ch->trans_skb->len = 0;
1461                 ch->ccw[1].count = ch->max_bufsize;
1462                         if (do_debug_ccw)
1463                         ctcmpc_dumpit((char *)&ch->ccw[0],
1464                                         sizeof(struct ccw1) * 3);
1465                 dolock = !in_irq();
1466                 if (dolock)
1467                         spin_lock_irqsave(
1468                                 get_ccwdev_lock(ch->cdev), saveflags);
1469                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1470                                                 (unsigned long)ch, 0xff, 0);
1471                 if (dolock) /* see remark about conditional locking */
1472                         spin_unlock_irqrestore(
1473                                 get_ccwdev_lock(ch->cdev), saveflags);
1474                 if (rc != 0)
1475                         ctcm_ccw_check_rc(ch, rc, "normal RX");
1476         default:
1477                 break;
1478         }
1479
1480         CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1481                         __func__, dev->name, ch, ch->id);
1482
1483 }
1484
1485 /**
1486  * Initialize connection by sending a __u16 of value 0.
1487  *
1488  * fi           An instance of a channel statemachine.
1489  * event        The event, just happened.
1490  * arg          Generic pointer, casted from channel * upon call.
1491  */
1492 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1493 {
1494         struct channel          *ch = arg;
1495         struct net_device       *dev = ch->netdev;
1496         struct ctcm_priv        *priv = dev->ml_priv;
1497         struct mpc_group        *gptr = priv->mpcg;
1498
1499         CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1500                                 __func__, ch->id, ch);
1501
1502         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1503                         "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1504                         CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1505                         fsm_getstate(gptr->fsm), ch->protocol);
1506
1507         if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1508                 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1509
1510         fsm_deltimer(&ch->timer);
1511         if (ctcm_checkalloc_buffer(ch))
1512                                 goto done;
1513
1514         switch (fsm_getstate(fi)) {
1515         case CTC_STATE_STARTRETRY:
1516         case CTC_STATE_SETUPWAIT:
1517                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1518                         ctcmpc_chx_rxidle(fi, event, arg);
1519                 } else {
1520                         fsm_newstate(fi, CTC_STATE_TXIDLE);
1521                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1522                 }
1523                                 goto done;
1524         default:
1525                 break;
1526         };
1527
1528         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1529                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1530
1531 done:
1532         CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1533                                 __func__, ch->id, ch);
1534         return;
1535 }
1536
1537 /**
1538  * Got initial data, check it. If OK,
1539  * notify device statemachine that we are up and
1540  * running.
1541  *
1542  * fi           An instance of a channel statemachine.
1543  * event        The event, just happened.
1544  * arg          Generic pointer, casted from channel * upon call.
1545  */
1546 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1547 {
1548         struct channel *ch = arg;
1549         struct net_device *dev = ch->netdev;
1550         struct ctcm_priv  *priv = dev->ml_priv;
1551         struct mpc_group  *grp = priv->mpcg;
1552         int rc;
1553         unsigned long saveflags = 0;    /* avoids compiler warning */
1554
1555         fsm_deltimer(&ch->timer);
1556         CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1557                         __func__, ch->id, dev->name, smp_processor_id(),
1558                                 fsm_getstate(fi), fsm_getstate(grp->fsm));
1559
1560         fsm_newstate(fi, CTC_STATE_RXIDLE);
1561         /* XID processing complete */
1562
1563         switch (fsm_getstate(grp->fsm)) {
1564         case MPCG_STATE_FLOWC:
1565         case MPCG_STATE_READY:
1566                 if (ctcm_checkalloc_buffer(ch))
1567                                 goto done;
1568                 ch->trans_skb->data = ch->trans_skb_data;
1569                 skb_reset_tail_pointer(ch->trans_skb);
1570                 ch->trans_skb->len = 0;
1571                 ch->ccw[1].count = ch->max_bufsize;
1572                 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1573                 if (event == CTC_EVENT_START)
1574                         /* see remark about conditional locking */
1575                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1576                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1577                                                 (unsigned long)ch, 0xff, 0);
1578                 if (event == CTC_EVENT_START)
1579                         spin_unlock_irqrestore(
1580                                         get_ccwdev_lock(ch->cdev), saveflags);
1581                 if (rc != 0) {
1582                         fsm_newstate(fi, CTC_STATE_RXINIT);
1583                         ctcm_ccw_check_rc(ch, rc, "initial RX");
1584                                 goto done;
1585                 }
1586                 break;
1587         default:
1588                 break;
1589         }
1590
1591         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1592 done:
1593         return;
1594 }
1595
1596 /*
1597  * ctcmpc channel FSM action
1598  * called from several points in ctcmpc_ch_fsm
1599  * ctcmpc only
1600  */
1601 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1602 {
1603         struct channel    *ch     = arg;
1604         struct net_device *dev    = ch->netdev;
1605         struct ctcm_priv  *priv   = dev->ml_priv;
1606         struct mpc_group  *grp = priv->mpcg;
1607
1608         CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1609                 __func__, dev->name, ch->id, ch, smp_processor_id(),
1610                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1611
1612         switch (fsm_getstate(grp->fsm)) {
1613         case MPCG_STATE_XID2INITW:
1614                 /* ok..start yside xid exchanges */
1615                 if (!ch->in_mpcgroup)
1616                         break;
1617                 if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
1618                         fsm_deltimer(&grp->timer);
1619                         fsm_addtimer(&grp->timer,
1620                                 MPC_XID_TIMEOUT_VALUE,
1621                                 MPCG_EVENT_TIMER, dev);
1622                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1623
1624                 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1625                         /* attn rcvd before xid0 processed via bh */
1626                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1627                 break;
1628         case MPCG_STATE_XID2INITX:
1629         case MPCG_STATE_XID0IOWAIT:
1630         case MPCG_STATE_XID0IOWAIX:
1631                 /* attn rcvd before xid0 processed on ch
1632                 but mid-xid0 processing for group    */
1633                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1634                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1635                 break;
1636         case MPCG_STATE_XID7INITW:
1637         case MPCG_STATE_XID7INITX:
1638         case MPCG_STATE_XID7INITI:
1639         case MPCG_STATE_XID7INITZ:
1640                 switch (fsm_getstate(ch->fsm)) {
1641                 case CH_XID7_PENDING:
1642                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1643                         break;
1644                 case CH_XID7_PENDING2:
1645                         fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1646                         break;
1647                 }
1648                 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1649                 break;
1650         }
1651
1652         return;
1653 }
1654
1655 /*
1656  * ctcmpc channel FSM action
1657  * called from one point in ctcmpc_ch_fsm
1658  * ctcmpc only
1659  */
1660 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1661 {
1662         struct channel    *ch     = arg;
1663         struct net_device *dev    = ch->netdev;
1664         struct ctcm_priv  *priv   = dev->ml_priv;
1665         struct mpc_group  *grp    = priv->mpcg;
1666
1667         CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
1668                         __func__, dev->name, ch->id,
1669                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1670
1671         fsm_deltimer(&ch->timer);
1672
1673         switch (fsm_getstate(grp->fsm)) {
1674         case MPCG_STATE_XID0IOWAIT:
1675                 /* vtam wants to be primary.start yside xid exchanges*/
1676                 /* only receive one attn-busy at a time so must not  */
1677                 /* change state each time                            */
1678                 grp->changed_side = 1;
1679                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1680                 break;
1681         case MPCG_STATE_XID2INITW:
1682                 if (grp->changed_side == 1) {
1683                         grp->changed_side = 2;
1684                         break;
1685                 }
1686                 /* process began via call to establish_conn      */
1687                 /* so must report failure instead of reverting   */
1688                 /* back to ready-for-xid passive state           */
1689                 if (grp->estconnfunc)
1690                                 goto done;
1691                 /* this attnbusy is NOT the result of xside xid  */
1692                 /* collisions so yside must have been triggered  */
1693                 /* by an ATTN that was not intended to start XID */
1694                 /* processing. Revert back to ready-for-xid and  */
1695                 /* wait for ATTN interrupt to signal xid start   */
1696                 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1697                         fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1698                         fsm_deltimer(&grp->timer);
1699                                 goto done;
1700                 }
1701                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1702                                 goto done;
1703         case MPCG_STATE_XID2INITX:
1704                 /* XID2 was received before ATTN Busy for second
1705                    channel.Send yside xid for second channel.
1706                 */
1707                 if (grp->changed_side == 1) {
1708                         grp->changed_side = 2;
1709                         break;
1710                 }
1711         case MPCG_STATE_XID0IOWAIX:
1712         case MPCG_STATE_XID7INITW:
1713         case MPCG_STATE_XID7INITX:
1714         case MPCG_STATE_XID7INITI:
1715         case MPCG_STATE_XID7INITZ:
1716         default:
1717                 /* multiple attn-busy indicates too out-of-sync      */
1718                 /* and they are certainly not being received as part */
1719                 /* of valid mpc group negotiations..                 */
1720                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1721                                 goto done;
1722         }
1723
1724         if (grp->changed_side == 1) {
1725                 fsm_deltimer(&grp->timer);
1726                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1727                              MPCG_EVENT_TIMER, dev);
1728         }
1729         if (ch->in_mpcgroup)
1730                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1731         else
1732                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1733                         "%s(%s): channel %s not added to group",
1734                                 CTCM_FUNTAIL, dev->name, ch->id);
1735
1736 done:
1737         return;
1738 }
1739
1740 /*
1741  * ctcmpc channel FSM action
1742  * called from several points in ctcmpc_ch_fsm
1743  * ctcmpc only
1744  */
1745 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1746 {
1747         struct channel     *ch     = arg;
1748         struct net_device  *dev    = ch->netdev;
1749         struct ctcm_priv   *priv   = dev->ml_priv;
1750         struct mpc_group   *grp    = priv->mpcg;
1751
1752         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1753         return;
1754 }
1755
1756 /*
1757  * ctcmpc channel FSM action
1758  * called from several points in ctcmpc_ch_fsm
1759  * ctcmpc only
1760  */
1761 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1762 {
1763         struct channel *ach = arg;
1764         struct net_device *dev = ach->netdev;
1765         struct ctcm_priv *priv = dev->ml_priv;
1766         struct mpc_group *grp = priv->mpcg;
1767         struct channel *wch = priv->channel[CTCM_WRITE];
1768         struct channel *rch = priv->channel[CTCM_READ];
1769         struct sk_buff *skb;
1770         struct th_sweep *header;
1771         int rc = 0;
1772         unsigned long saveflags = 0;
1773
1774         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1775                         __func__, smp_processor_id(), ach, ach->id);
1776
1777         if (grp->in_sweep == 0)
1778                                 goto done;
1779
1780         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1781                                 __func__, wch->th_seq_num);
1782         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1783                                 __func__, rch->th_seq_num);
1784
1785         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1786                 /* give the previous IO time to complete */
1787                 fsm_addtimer(&wch->sweep_timer,
1788                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1789                                 goto done;
1790         }
1791
1792         skb = skb_dequeue(&wch->sweep_queue);
1793         if (!skb)
1794                                 goto done;
1795
1796         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1797                 grp->in_sweep = 0;
1798                 ctcm_clear_busy_do(dev);
1799                 dev_kfree_skb_any(skb);
1800                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1801                                 goto done;
1802         } else {
1803                 atomic_inc(&skb->users);
1804                 skb_queue_tail(&wch->io_queue, skb);
1805         }
1806
1807         /* send out the sweep */
1808         wch->ccw[4].count = skb->len;
1809
1810         header = (struct th_sweep *)skb->data;
1811         switch (header->th.th_ch_flag) {
1812         case TH_SWEEP_REQ:
1813                 grp->sweep_req_pend_num--;
1814                 break;
1815         case TH_SWEEP_RESP:
1816                 grp->sweep_rsp_pend_num--;
1817                 break;
1818         }
1819
1820         header->sw.th_last_seq = wch->th_seq_num;
1821
1822         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1823         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1824         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1825
1826         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1827         fsm_newstate(wch->fsm, CTC_STATE_TX);
1828
1829         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1830         wch->prof.send_stamp = current_kernel_time(); /* xtime */
1831         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1832                                         (unsigned long) wch, 0xff, 0);
1833         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1834
1835         if ((grp->sweep_req_pend_num == 0) &&
1836            (grp->sweep_rsp_pend_num == 0)) {
1837                 grp->in_sweep = 0;
1838                 rch->th_seq_num = 0x00;
1839                 wch->th_seq_num = 0x00;
1840                 ctcm_clear_busy_do(dev);
1841         }
1842
1843         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1844                         __func__, wch->th_seq_num, rch->th_seq_num);
1845
1846         if (rc != 0)
1847                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1848
1849 done:
1850         return;
1851 }
1852
1853
1854 /*
1855  * The ctcmpc statemachine for a channel.
1856  */
1857
1858 const fsm_node ctcmpc_ch_fsm[] = {
1859         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1860         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1861         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1862         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1863         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1864
1865         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1866         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1867         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1868         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1869         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1870         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1871         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1872         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1873
1874         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1875         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1876         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1877         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1878         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1879         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1880
1881         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1882         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1883         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1884         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1885         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1886
1887         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1888         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1889         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1890         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1891         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1892         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1893         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1894         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1895
1896         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1897         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1898         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1899         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1900         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1901         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1902         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1903         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1904         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1905         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1906
1907         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1908         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1909         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1910         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1911         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1912         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1913         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1914         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1915         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1916         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1917
1918         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1919         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1920         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1921         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1922         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1923         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1924         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1925         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1926         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1927         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1928         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1929
1930         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1931         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1932         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1933         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1934         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1935         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1936         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1937         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1938         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1939         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1940         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1941         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1942         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1943
1944         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1945         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1946         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1947         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1948         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1949         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1950         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1951         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1952         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1953         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1954         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1955         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1956
1957         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1958         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1959         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1960         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1961         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1962         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1963         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1964         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1965         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1966         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1967         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1968         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1969
1970         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1971         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1972         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1973         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1974         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1975         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1976         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1977         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1978         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1979         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1980         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1981         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1982
1983         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1984         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1985         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1986         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1987         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1988         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1989         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1990         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1991         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1992         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1993         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1994         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1995
1996         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1997         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1998         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1999         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
2000         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2001         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2002         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2003         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
2004
2005         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2006         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
2007         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
2008         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
2009         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
2010         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2011         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2012         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2013         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2014
2015         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2016         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2017         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2018         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2019         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2020         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2021         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2022         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2023
2024         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2025         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2026         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2027         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2028         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2029         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2030         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2031         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2032
2033         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2034         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2035         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2036         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2037         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2038         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2039         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2040
2041         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2042         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2043         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2044         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2045         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2046         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2047         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2048         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2049         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2050         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2051
2052         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2053         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2054         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2055         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2056         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2057 };
2058
2059 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2060
2061 /*
2062  * Actions for interface - statemachine.
2063  */
2064
2065 /**
2066  * Startup channels by sending CTC_EVENT_START to each channel.
2067  *
2068  * fi           An instance of an interface statemachine.
2069  * event        The event, just happened.
2070  * arg          Generic pointer, casted from struct net_device * upon call.
2071  */
2072 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2073 {
2074         struct net_device *dev = arg;
2075         struct ctcm_priv *priv = dev->ml_priv;
2076         int direction;
2077
2078         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2079
2080         fsm_deltimer(&priv->restart_timer);
2081         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2082         if (IS_MPC(priv))
2083                 priv->mpcg->channels_terminating = 0;
2084         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2085                 struct channel *ch = priv->channel[direction];
2086                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2087         }
2088 }
2089
2090 /**
2091  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2092  *
2093  * fi           An instance of an interface statemachine.
2094  * event        The event, just happened.
2095  * arg          Generic pointer, casted from struct net_device * upon call.
2096  */
2097 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2098 {
2099         int direction;
2100         struct net_device *dev = arg;
2101         struct ctcm_priv *priv = dev->ml_priv;
2102
2103         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2104
2105         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2106         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2107                 struct channel *ch = priv->channel[direction];
2108                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2109                 ch->th_seq_num = 0x00;
2110                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2111                                 __func__, ch->th_seq_num);
2112         }
2113         if (IS_MPC(priv))
2114                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2115 }
2116
2117 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2118 {
2119         int restart_timer;
2120         struct net_device *dev = arg;
2121         struct ctcm_priv *priv = dev->ml_priv;
2122
2123         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2124
2125         if (IS_MPC(priv)) {
2126                 restart_timer = CTCM_TIME_1_SEC;
2127         } else {
2128                 restart_timer = CTCM_TIME_5_SEC;
2129         }
2130         dev_info(&dev->dev, "Restarting device\n");
2131
2132         dev_action_stop(fi, event, arg);
2133         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2134         if (IS_MPC(priv))
2135                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2136
2137         /* going back into start sequence too quickly can         */
2138         /* result in the other side becoming unreachable   due    */
2139         /* to sense reported when IO is aborted                   */
2140         fsm_addtimer(&priv->restart_timer, restart_timer,
2141                         DEV_EVENT_START, dev);
2142 }
2143
2144 /**
2145  * Called from channel statemachine
2146  * when a channel is up and running.
2147  *
2148  * fi           An instance of an interface statemachine.
2149  * event        The event, just happened.
2150  * arg          Generic pointer, casted from struct net_device * upon call.
2151  */
2152 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2153 {
2154         struct net_device *dev = arg;
2155         struct ctcm_priv *priv = dev->ml_priv;
2156         int dev_stat = fsm_getstate(fi);
2157
2158         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2159                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2160                                 dev->name, dev->ml_priv, dev_stat, event);
2161
2162         switch (fsm_getstate(fi)) {
2163         case DEV_STATE_STARTWAIT_RXTX:
2164                 if (event == DEV_EVENT_RXUP)
2165                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2166                 else
2167                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2168                 break;
2169         case DEV_STATE_STARTWAIT_RX:
2170                 if (event == DEV_EVENT_RXUP) {
2171                         fsm_newstate(fi, DEV_STATE_RUNNING);
2172                         dev_info(&dev->dev,
2173                                 "Connected with remote side\n");
2174                         ctcm_clear_busy(dev);
2175                 }
2176                 break;
2177         case DEV_STATE_STARTWAIT_TX:
2178                 if (event == DEV_EVENT_TXUP) {
2179                         fsm_newstate(fi, DEV_STATE_RUNNING);
2180                         dev_info(&dev->dev,
2181                                 "Connected with remote side\n");
2182                         ctcm_clear_busy(dev);
2183                 }
2184                 break;
2185         case DEV_STATE_STOPWAIT_TX:
2186                 if (event == DEV_EVENT_RXUP)
2187                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2188                 break;
2189         case DEV_STATE_STOPWAIT_RX:
2190                 if (event == DEV_EVENT_TXUP)
2191                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2192                 break;
2193         }
2194
2195         if (IS_MPC(priv)) {
2196                 if (event == DEV_EVENT_RXUP)
2197                         mpc_channel_action(priv->channel[CTCM_READ],
2198                                 CTCM_READ, MPC_CHANNEL_ADD);
2199                 else
2200                         mpc_channel_action(priv->channel[CTCM_WRITE],
2201                                 CTCM_WRITE, MPC_CHANNEL_ADD);
2202         }
2203 }
2204
2205 /**
2206  * Called from device statemachine
2207  * when a channel has been shutdown.
2208  *
2209  * fi           An instance of an interface statemachine.
2210  * event        The event, just happened.
2211  * arg          Generic pointer, casted from struct net_device * upon call.
2212  */
2213 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2214 {
2215
2216         struct net_device *dev = arg;
2217         struct ctcm_priv *priv = dev->ml_priv;
2218
2219         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2220
2221         switch (fsm_getstate(fi)) {
2222         case DEV_STATE_RUNNING:
2223                 if (event == DEV_EVENT_TXDOWN)
2224                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2225                 else
2226                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2227                 break;
2228         case DEV_STATE_STARTWAIT_RX:
2229                 if (event == DEV_EVENT_TXDOWN)
2230                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2231                 break;
2232         case DEV_STATE_STARTWAIT_TX:
2233                 if (event == DEV_EVENT_RXDOWN)
2234                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2235                 break;
2236         case DEV_STATE_STOPWAIT_RXTX:
2237                 if (event == DEV_EVENT_TXDOWN)
2238                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2239                 else
2240                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2241                 break;
2242         case DEV_STATE_STOPWAIT_RX:
2243                 if (event == DEV_EVENT_RXDOWN)
2244                         fsm_newstate(fi, DEV_STATE_STOPPED);
2245                 break;
2246         case DEV_STATE_STOPWAIT_TX:
2247                 if (event == DEV_EVENT_TXDOWN)
2248                         fsm_newstate(fi, DEV_STATE_STOPPED);
2249                 break;
2250         }
2251         if (IS_MPC(priv)) {
2252                 if (event == DEV_EVENT_RXDOWN)
2253                         mpc_channel_action(priv->channel[CTCM_READ],
2254                                 CTCM_READ, MPC_CHANNEL_REMOVE);
2255                 else
2256                         mpc_channel_action(priv->channel[CTCM_WRITE],
2257                                 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2258         }
2259 }
2260
2261 const fsm_node dev_fsm[] = {
2262         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2263         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2264         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2265         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2266         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2267         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2268         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2269         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2270         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2271         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2272         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2273         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2274         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2275         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2276         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2277         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2278         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2279         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2280         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2281         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2282         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2283         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2284         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2285         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2286         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2287         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2288         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2289         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2290         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2291         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2292         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2293         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2294         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2295         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2296         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2297         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2298         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2299 };
2300
2301 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2302
2303 /* --- This is the END my friend --- */
2304