drivers/s390/net/ctcm_fsms.c

   1 /*
   2  * drivers/s390/net/ctcm_fsms.c
   3  *
   4  * Copyright IBM Corp. 2001, 2007
   5  * Authors:     Fritz Elfert (felfert@millenux.com)
   6  *              Peter Tiedemann (ptiedem@de.ibm.com)
   7  *      MPC additions :
   8  *              Belinda Thompson (belindat@us.ibm.com)
   9  *              Andy Richter (richtera@us.ibm.com)
  10  */
  11
  12 #undef DEBUG
  13 #undef DEBUGDATA
  14 #undef DEBUGCCW
  15
  16 #define KMSG_COMPONENT "ctcm"
  17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  18
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/slab.h>
  23 #include <linux/errno.h>
  24 #include <linux/types.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/timer.h>
  27 #include <linux/bitops.h>
  28
  29 #include <linux/signal.h>
  30 #include <linux/string.h>
  31
  32 #include <linux/ip.h>
  33 #include <linux/if_arp.h>
  34 #include <linux/tcp.h>
  35 #include <linux/skbuff.h>
  36 #include <linux/ctype.h>
  37 #include <net/dst.h>
  38
  39 #include <linux/io.h>
  40 #include <asm/ccwdev.h>
  41 #include <asm/ccwgroup.h>
  42 #include <linux/uaccess.h>
  43
  44 #include <asm/idals.h>
  45
  46 #include "fsm.h"
  47
  48 #include "ctcm_dbug.h"
  49 #include "ctcm_main.h"
  50 #include "ctcm_fsms.h"
  51
  52 const char *dev_state_names[] = {
  53         [DEV_STATE_STOPPED]             = "Stopped",
  54         [DEV_STATE_STARTWAIT_RXTX]      = "StartWait RXTX",
  55         [DEV_STATE_STARTWAIT_RX]        = "StartWait RX",
  56         [DEV_STATE_STARTWAIT_TX]        = "StartWait TX",
  57         [DEV_STATE_STOPWAIT_RXTX]       = "StopWait RXTX",
  58         [DEV_STATE_STOPWAIT_RX]         = "StopWait RX",
  59         [DEV_STATE_STOPWAIT_TX]         = "StopWait TX",
  60         [DEV_STATE_RUNNING]             = "Running",
  61 };
  62
  63 const char *dev_event_names[] = {
  64         [DEV_EVENT_START]       = "Start",
  65         [DEV_EVENT_STOP]        = "Stop",
  66         [DEV_EVENT_RXUP]        = "RX up",
  67         [DEV_EVENT_TXUP]        = "TX up",
  68         [DEV_EVENT_RXDOWN]      = "RX down",
  69         [DEV_EVENT_TXDOWN]      = "TX down",
  70         [DEV_EVENT_RESTART]     = "Restart",
  71 };
  72
  73 const char *ctc_ch_event_names[] = {
  74         [CTC_EVENT_IO_SUCCESS]  = "ccw_device success",
  75         [CTC_EVENT_IO_EBUSY]    = "ccw_device busy",
  76         [CTC_EVENT_IO_ENODEV]   = "ccw_device enodev",
  77         [CTC_EVENT_IO_UNKNOWN]  = "ccw_device unknown",
  78         [CTC_EVENT_ATTNBUSY]    = "Status ATTN & BUSY",
  79         [CTC_EVENT_ATTN]        = "Status ATTN",
  80         [CTC_EVENT_BUSY]        = "Status BUSY",
  81         [CTC_EVENT_UC_RCRESET]  = "Unit check remote reset",
  82         [CTC_EVENT_UC_RSRESET]  = "Unit check remote system reset",
  83         [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout",
  84         [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity",
  85         [CTC_EVENT_UC_HWFAIL]   = "Unit check Hardware failure",
  86         [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity",
  87         [CTC_EVENT_UC_ZERO]     = "Unit check ZERO",
  88         [CTC_EVENT_UC_UNKNOWN]  = "Unit check Unknown",
  89         [CTC_EVENT_SC_UNKNOWN]  = "SubChannel check Unknown",
  90         [CTC_EVENT_MC_FAIL]     = "Machine check failure",
  91         [CTC_EVENT_MC_GOOD]     = "Machine check operational",
  92         [CTC_EVENT_IRQ]         = "IRQ normal",
  93         [CTC_EVENT_FINSTAT]     = "IRQ final",
  94         [CTC_EVENT_TIMER]       = "Timer",
  95         [CTC_EVENT_START]       = "Start",
  96         [CTC_EVENT_STOP]        = "Stop",
  97         /*
  98         * additional MPC events
  99         */
 100         [CTC_EVENT_SEND_XID]    = "XID Exchange",
 101         [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer",
 102 };
 103
 104 const char *ctc_ch_state_names[] = {
 105         [CTC_STATE_IDLE]        = "Idle",
 106         [CTC_STATE_STOPPED]     = "Stopped",
 107         [CTC_STATE_STARTWAIT]   = "StartWait",
 108         [CTC_STATE_STARTRETRY]  = "StartRetry",
 109         [CTC_STATE_SETUPWAIT]   = "SetupWait",
 110         [CTC_STATE_RXINIT]      = "RX init",
 111         [CTC_STATE_TXINIT]      = "TX init",
 112         [CTC_STATE_RX]          = "RX",
 113         [CTC_STATE_TX]          = "TX",
 114         [CTC_STATE_RXIDLE]      = "RX idle",
 115         [CTC_STATE_TXIDLE]      = "TX idle",
 116         [CTC_STATE_RXERR]       = "RX error",
 117         [CTC_STATE_TXERR]       = "TX error",
 118         [CTC_STATE_TERM]        = "Terminating",
 119         [CTC_STATE_DTERM]       = "Restarting",
 120         [CTC_STATE_NOTOP]       = "Not operational",
 121         /*
 122         * additional MPC states
 123         */
 124         [CH_XID0_PENDING]       = "Pending XID0 Start",
 125         [CH_XID0_INPROGRESS]    = "In XID0 Negotiations ",
 126         [CH_XID7_PENDING]       = "Pending XID7 P1 Start",
 127         [CH_XID7_PENDING1]      = "Active XID7 P1 Exchange ",
 128         [CH_XID7_PENDING2]      = "Pending XID7 P2 Start ",
 129         [CH_XID7_PENDING3]      = "Active XID7 P2 Exchange ",
 130         [CH_XID7_PENDING4]      = "XID7 Complete - Pending READY ",
 131 };
 132
 133 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg);
 134
 135 /*
 136  * ----- static ctcm actions for channel statemachine -----
 137  *
 138 */
 139 static void chx_txdone(fsm_instance *fi, int event, void *arg);
 140 static void chx_rx(fsm_instance *fi, int event, void *arg);
 141 static void chx_rxidle(fsm_instance *fi, int event, void *arg);
 142 static void chx_firstio(fsm_instance *fi, int event, void *arg);
 143 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
 144 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
 145 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
 146 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
 147 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
 148 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
 149 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
 150 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
 151 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
 152 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
 153 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
 154 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
 155 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
 156 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
 157
 158 /*
 159  * ----- static ctcmpc actions for ctcmpc channel statemachine -----
 160  *
 161 */
 162 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg);
 163 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg);
 164 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg);
 165 /* shared :
 166 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg);
 167 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg);
 168 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg);
 169 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg);
 170 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg);
 171 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg);
 172 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg);
 173 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg);
 174 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg);
 175 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg);
 176 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg);
 177 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg);
 178 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg);
 179 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg);
 180 */
 181 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg);
 182 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *);
 183 static void ctcmpc_chx_resend(fsm_instance *, int, void *);
 184 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg);
 185
 186 /**
 187  * Check return code of a preceding ccw_device call, halt_IO etc...
 188  *
 189  * ch   :       The channel, the error belongs to.
 190  * Returns the error code (!= 0) to inspect.
 191  */
 192 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg)
 193 {
 194         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 195                 "%s(%s): %s: %04x\n",
 196                 CTCM_FUNTAIL, ch->id, msg, rc);
 197         switch (rc) {
 198         case -EBUSY:
 199                 pr_info("%s: The communication peer is busy\n",
 200                         ch->id);
 201                 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch);
 202                 break;
 203         case -ENODEV:
 204                 pr_err("%s: The specified target device is not valid\n",
 205                        ch->id);
 206                 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch);
 207                 break;
 208         default:
 209                 pr_err("An I/O operation resulted in error %04x\n",
 210                        rc);
 211                 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch);
 212         }
 213 }
 214
 215 void ctcm_purge_skb_queue(struct sk_buff_head *q)
 216 {
 217         struct sk_buff *skb;
 218
 219         CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__);
 220
 221         while ((skb = skb_dequeue(q))) {
 222                 atomic_dec(&skb->users);
 223                 dev_kfree_skb_any(skb);
 224         }
 225 }
 226
 227 /**
 228  * NOP action for statemachines
 229  */
 230 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg)
 231 {
 232 }
 233
 234 /*
 235  * Actions for channel - statemachines.
 236  */
 237
 238 /**
 239  * Normal data has been send. Free the corresponding
 240  * skb (it's in io_queue), reset dev->tbusy and
 241  * revert to idle state.
 242  *
 243  * fi           An instance of a channel statemachine.
 244  * event        The event, just happened.
 245  * arg          Generic pointer, casted from channel * upon call.
 246  */
 247 static void chx_txdone(fsm_instance *fi, int event, void *arg)
 248 {
 249         struct channel *ch = arg;
 250         struct net_device *dev = ch->netdev;
 251         struct ctcm_priv *priv = dev->ml_priv;
 252         struct sk_buff *skb;
 253         int first = 1;
 254         int i;
 255         unsigned long duration;
 256         struct timespec done_stamp = current_kernel_time(); /* xtime */
 257
 258         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 259
 260         duration =
 261             (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
 262             (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
 263         if (duration > ch->prof.tx_time)
 264                 ch->prof.tx_time = duration;
 265
 266         if (ch->irb->scsw.cmd.count != 0)
 267                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 268                         "%s(%s): TX not complete, remaining %d bytes",
 269                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
 270         fsm_deltimer(&ch->timer);
 271         while ((skb = skb_dequeue(&ch->io_queue))) {
 272                 priv->stats.tx_packets++;
 273                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 274                 if (first) {
 275                         priv->stats.tx_bytes += 2;
 276                         first = 0;
 277                 }
 278                 atomic_dec(&skb->users);
 279                 dev_kfree_skb_irq(skb);
 280         }
 281         spin_lock(&ch->collect_lock);
 282         clear_normalized_cda(&ch->ccw[4]);
 283         if (ch->collect_len > 0) {
 284                 int rc;
 285
 286                 if (ctcm_checkalloc_buffer(ch)) {
 287                         spin_unlock(&ch->collect_lock);
 288                         return;
 289                 }
 290                 ch->trans_skb->data = ch->trans_skb_data;
 291                 skb_reset_tail_pointer(ch->trans_skb);
 292                 ch->trans_skb->len = 0;
 293                 if (ch->prof.maxmulti < (ch->collect_len + 2))
 294                         ch->prof.maxmulti = ch->collect_len + 2;
 295                 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
 296                         ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
 297                 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2;
 298                 i = 0;
 299                 while ((skb = skb_dequeue(&ch->collect_queue))) {
 300                         skb_copy_from_linear_data(skb,
 301                                 skb_put(ch->trans_skb, skb->len), skb->len);
 302                         priv->stats.tx_packets++;
 303                         priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 304                         atomic_dec(&skb->users);
 305                         dev_kfree_skb_irq(skb);
 306                         i++;
 307                 }
 308                 ch->collect_len = 0;
 309                 spin_unlock(&ch->collect_lock);
 310                 ch->ccw[1].count = ch->trans_skb->len;
 311                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 312                 ch->prof.send_stamp = current_kernel_time(); /* xtime */
 313                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 314                                                 (unsigned long)ch, 0xff, 0);
 315                 ch->prof.doios_multi++;
 316                 if (rc != 0) {
 317                         priv->stats.tx_dropped += i;
 318                         priv->stats.tx_errors += i;
 319                         fsm_deltimer(&ch->timer);
 320                         ctcm_ccw_check_rc(ch, rc, "chained TX");
 321                 }
 322         } else {
 323                 spin_unlock(&ch->collect_lock);
 324                 fsm_newstate(fi, CTC_STATE_TXIDLE);
 325         }
 326         ctcm_clear_busy_do(dev);
 327 }
 328
 329 /**
 330  * Initial data is sent.
 331  * Notify device statemachine that we are up and
 332  * running.
 333  *
 334  * fi           An instance of a channel statemachine.
 335  * event        The event, just happened.
 336  * arg          Generic pointer, casted from channel * upon call.
 337  */
 338 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg)
 339 {
 340         struct channel *ch = arg;
 341         struct net_device *dev = ch->netdev;
 342         struct ctcm_priv *priv = dev->ml_priv;
 343
 344         CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name);
 345
 346         fsm_deltimer(&ch->timer);
 347         fsm_newstate(fi, CTC_STATE_TXIDLE);
 348         fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev);
 349 }
 350
 351 /**
 352  * Got normal data, check for sanity, queue it up, allocate new buffer
 353  * trigger bottom half, and initiate next read.
 354  *
 355  * fi           An instance of a channel statemachine.
 356  * event        The event, just happened.
 357  * arg          Generic pointer, casted from channel * upon call.
 358  */
 359 static void chx_rx(fsm_instance *fi, int event, void *arg)
 360 {
 361         struct channel *ch = arg;
 362         struct net_device *dev = ch->netdev;
 363         struct ctcm_priv *priv = dev->ml_priv;
 364         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
 365         struct sk_buff *skb = ch->trans_skb;
 366         __u16 block_len = *((__u16 *)skb->data);
 367         int check_len;
 368         int rc;
 369
 370         fsm_deltimer(&ch->timer);
 371         if (len < 8) {
 372                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 373                         "%s(%s): got packet with length %d < 8\n",
 374                                         CTCM_FUNTAIL, dev->name, len);
 375                 priv->stats.rx_dropped++;
 376                 priv->stats.rx_length_errors++;
 377                                                 goto again;
 378         }
 379         if (len > ch->max_bufsize) {
 380                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 381                         "%s(%s): got packet with length %d > %d\n",
 382                                 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize);
 383                 priv->stats.rx_dropped++;
 384                 priv->stats.rx_length_errors++;
 385                                                 goto again;
 386         }
 387
 388         /*
 389          * VM TCP seems to have a bug sending 2 trailing bytes of garbage.
 390          */
 391         switch (ch->protocol) {
 392         case CTCM_PROTO_S390:
 393         case CTCM_PROTO_OS390:
 394                 check_len = block_len + 2;
 395                 break;
 396         default:
 397                 check_len = block_len;
 398                 break;
 399         }
 400         if ((len < block_len) || (len > check_len)) {
 401                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 402                         "%s(%s): got block length %d != rx length %d\n",
 403                                 CTCM_FUNTAIL, dev->name, block_len, len);
 404                 if (do_debug)
 405                         ctcmpc_dump_skb(skb, 0);
 406
 407                 *((__u16 *)skb->data) = len;
 408                 priv->stats.rx_dropped++;
 409                 priv->stats.rx_length_errors++;
 410                                                 goto again;
 411         }
 412         if (block_len > 2) {
 413                 *((__u16 *)skb->data) = block_len - 2;
 414                 ctcm_unpack_skb(ch, skb);
 415         }
 416  again:
 417         skb->data = ch->trans_skb_data;
 418         skb_reset_tail_pointer(skb);
 419         skb->len = 0;
 420         if (ctcm_checkalloc_buffer(ch))
 421                 return;
 422         ch->ccw[1].count = ch->max_bufsize;
 423         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 424                                         (unsigned long)ch, 0xff, 0);
 425         if (rc != 0)
 426                 ctcm_ccw_check_rc(ch, rc, "normal RX");
 427 }
 428
 429 /**
 430  * Initialize connection by sending a __u16 of value 0.
 431  *
 432  * fi           An instance of a channel statemachine.
 433  * event        The event, just happened.
 434  * arg          Generic pointer, casted from channel * upon call.
 435  */
 436 static void chx_firstio(fsm_instance *fi, int event, void *arg)
 437 {
 438         int rc;
 439         struct channel *ch = arg;
 440         int fsmstate = fsm_getstate(fi);
 441
 442         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 443                 "%s(%s) : %02x",
 444                 CTCM_FUNTAIL, ch->id, fsmstate);
 445
 446         ch->sense_rc = 0;       /* reset unit check report control */
 447         if (fsmstate == CTC_STATE_TXIDLE)
 448                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 449                         "%s(%s): remote side issued READ?, init.\n",
 450                                 CTCM_FUNTAIL, ch->id);
 451         fsm_deltimer(&ch->timer);
 452         if (ctcm_checkalloc_buffer(ch))
 453                 return;
 454         if ((fsmstate == CTC_STATE_SETUPWAIT) &&
 455             (ch->protocol == CTCM_PROTO_OS390)) {
 456                 /* OS/390 resp. z/OS */
 457                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 458                         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
 459                         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC,
 460                                      CTC_EVENT_TIMER, ch);
 461                         chx_rxidle(fi, event, arg);
 462                 } else {
 463                         struct net_device *dev = ch->netdev;
 464                         struct ctcm_priv *priv = dev->ml_priv;
 465                         fsm_newstate(fi, CTC_STATE_TXIDLE);
 466                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
 467                 }
 468                 return;
 469         }
 470         /*
 471          * Don't setup a timer for receiving the initial RX frame
 472          * if in compatibility mode, since VM TCP delays the initial
 473          * frame until it has some data to send.
 474          */
 475         if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) ||
 476             (ch->protocol != CTCM_PROTO_S390))
 477                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 478
 479         *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN;
 480         ch->ccw[1].count = 2;   /* Transfer only length */
 481
 482         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 483                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
 484         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 485                                         (unsigned long)ch, 0xff, 0);
 486         if (rc != 0) {
 487                 fsm_deltimer(&ch->timer);
 488                 fsm_newstate(fi, CTC_STATE_SETUPWAIT);
 489                 ctcm_ccw_check_rc(ch, rc, "init IO");
 490         }
 491         /*
 492          * If in compatibility mode since we don't setup a timer, we
 493          * also signal RX channel up immediately. This enables us
 494          * to send packets early which in turn usually triggers some
 495          * reply from VM TCP which brings up the RX channel to it's
 496          * final state.
 497          */
 498         if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) &&
 499             (ch->protocol == CTCM_PROTO_S390)) {
 500                 struct net_device *dev = ch->netdev;
 501                 struct ctcm_priv *priv = dev->ml_priv;
 502                 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
 503         }
 504 }
 505
 506 /**
 507  * Got initial data, check it. If OK,
 508  * notify device statemachine that we are up and
 509  * running.
 510  *
 511  * fi           An instance of a channel statemachine.
 512  * event        The event, just happened.
 513  * arg          Generic pointer, casted from channel * upon call.
 514  */
 515 static void chx_rxidle(fsm_instance *fi, int event, void *arg)
 516 {
 517         struct channel *ch = arg;
 518         struct net_device *dev = ch->netdev;
 519         struct ctcm_priv *priv = dev->ml_priv;
 520         __u16 buflen;
 521         int rc;
 522
 523         fsm_deltimer(&ch->timer);
 524         buflen = *((__u16 *)ch->trans_skb->data);
 525         CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n",
 526                         __func__, dev->name, buflen);
 527
 528         if (buflen >= CTCM_INITIAL_BLOCKLEN) {
 529                 if (ctcm_checkalloc_buffer(ch))
 530                         return;
 531                 ch->ccw[1].count = ch->max_bufsize;
 532                 fsm_newstate(fi, CTC_STATE_RXIDLE);
 533                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
 534                                                 (unsigned long)ch, 0xff, 0);
 535                 if (rc != 0) {
 536                         fsm_newstate(fi, CTC_STATE_RXINIT);
 537                         ctcm_ccw_check_rc(ch, rc, "initial RX");
 538                 } else
 539                         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
 540         } else {
 541                 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n",
 542                                 __func__, dev->name,
 543                                         buflen, CTCM_INITIAL_BLOCKLEN);
 544                 chx_firstio(fi, event, arg);
 545         }
 546 }
 547
 548 /**
 549  * Set channel into extended mode.
 550  *
 551  * fi           An instance of a channel statemachine.
 552  * event        The event, just happened.
 553  * arg          Generic pointer, casted from channel * upon call.
 554  */
 555 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg)
 556 {
 557         struct channel *ch = arg;
 558         int rc;
 559         unsigned long saveflags = 0;
 560         int timeout = CTCM_TIME_5_SEC;
 561
 562         fsm_deltimer(&ch->timer);
 563         if (IS_MPC(ch)) {
 564                 timeout = 1500;
 565                 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n",
 566                                 __func__, smp_processor_id(), ch, ch->id);
 567         }
 568         fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch);
 569         fsm_newstate(fi, CTC_STATE_SETUPWAIT);
 570         CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2);
 571
 572         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
 573                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 574                         /* Such conditional locking is undeterministic in
 575                          * static view. => ignore sparse warnings here. */
 576
 577         rc = ccw_device_start(ch->cdev, &ch->ccw[6],
 578                                         (unsigned long)ch, 0xff, 0);
 579         if (event == CTC_EVENT_TIMER)   /* see above comments */
 580                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 581         if (rc != 0) {
 582                 fsm_deltimer(&ch->timer);
 583                 fsm_newstate(fi, CTC_STATE_STARTWAIT);
 584                 ctcm_ccw_check_rc(ch, rc, "set Mode");
 585         } else
 586                 ch->retry = 0;
 587 }
 588
 589 /**
 590  * Setup channel.
 591  *
 592  * fi           An instance of a channel statemachine.
 593  * event        The event, just happened.
 594  * arg          Generic pointer, casted from channel * upon call.
 595  */
 596 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg)
 597 {
 598         struct channel *ch      = arg;
 599         unsigned long saveflags;
 600         int rc;
 601
 602         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s",
 603                 CTCM_FUNTAIL, ch->id,
 604                 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX");
 605
 606         if (ch->trans_skb != NULL) {
 607                 clear_normalized_cda(&ch->ccw[1]);
 608                 dev_kfree_skb(ch->trans_skb);
 609                 ch->trans_skb = NULL;
 610         }
 611         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 612                 ch->ccw[1].cmd_code = CCW_CMD_READ;
 613                 ch->ccw[1].flags = CCW_FLAG_SLI;
 614                 ch->ccw[1].count = 0;
 615         } else {
 616                 ch->ccw[1].cmd_code = CCW_CMD_WRITE;
 617                 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 618                 ch->ccw[1].count = 0;
 619         }
 620         if (ctcm_checkalloc_buffer(ch)) {
 621                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 622                         "%s(%s): %s trans_skb alloc delayed "
 623                         "until first transfer",
 624                         CTCM_FUNTAIL, ch->id,
 625                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 626                                 "RX" : "TX");
 627         }
 628         ch->ccw[0].cmd_code = CCW_CMD_PREPARE;
 629         ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
 630         ch->ccw[0].count = 0;
 631         ch->ccw[0].cda = 0;
 632         ch->ccw[2].cmd_code = CCW_CMD_NOOP;     /* jointed CE + DE */
 633         ch->ccw[2].flags = CCW_FLAG_SLI;
 634         ch->ccw[2].count = 0;
 635         ch->ccw[2].cda = 0;
 636         memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3);
 637         ch->ccw[4].cda = 0;
 638         ch->ccw[4].flags &= ~CCW_FLAG_IDA;
 639
 640         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 641         fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
 642         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 643         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 644         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 645         if (rc != 0) {
 646                 if (rc != -EBUSY)
 647                         fsm_deltimer(&ch->timer);
 648                 ctcm_ccw_check_rc(ch, rc, "initial HaltIO");
 649         }
 650 }
 651
 652 /**
 653  * Shutdown a channel.
 654  *
 655  * fi           An instance of a channel statemachine.
 656  * event        The event, just happened.
 657  * arg          Generic pointer, casted from channel * upon call.
 658  */
 659 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg)
 660 {
 661         struct channel *ch = arg;
 662         unsigned long saveflags = 0;
 663         int rc;
 664         int oldstate;
 665
 666         fsm_deltimer(&ch->timer);
 667         if (IS_MPC(ch))
 668                 fsm_deltimer(&ch->sweep_timer);
 669
 670         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 671
 672         if (event == CTC_EVENT_STOP)    /* only for STOP not yet locked */
 673                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 674                         /* Such conditional locking is undeterministic in
 675                          * static view. => ignore sparse warnings here. */
 676         oldstate = fsm_getstate(fi);
 677         fsm_newstate(fi, CTC_STATE_TERM);
 678         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 679
 680         if (event == CTC_EVENT_STOP)
 681                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 682                         /* see remark above about conditional locking */
 683
 684         if (rc != 0 && rc != -EBUSY) {
 685                 fsm_deltimer(&ch->timer);
 686                 if (event != CTC_EVENT_STOP) {
 687                         fsm_newstate(fi, oldstate);
 688                         ctcm_ccw_check_rc(ch, rc, (char *)__func__);
 689                 }
 690         }
 691 }
 692
 693 /**
 694  * Cleanup helper for chx_fail and chx_stopped
 695  * cleanup channels queue and notify interface statemachine.
 696  *
 697  * fi           An instance of a channel statemachine.
 698  * state        The next state (depending on caller).
 699  * ch           The channel to operate on.
 700  */
 701 static void ctcm_chx_cleanup(fsm_instance *fi, int state,
 702                 struct channel *ch)
 703 {
 704         struct net_device *dev = ch->netdev;
 705         struct ctcm_priv *priv = dev->ml_priv;
 706
 707         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
 708                         "%s(%s): %s[%d]\n",
 709                         CTCM_FUNTAIL, dev->name, ch->id, state);
 710
 711         fsm_deltimer(&ch->timer);
 712         if (IS_MPC(ch))
 713                 fsm_deltimer(&ch->sweep_timer);
 714
 715         fsm_newstate(fi, state);
 716         if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) {
 717                 clear_normalized_cda(&ch->ccw[1]);
 718                 dev_kfree_skb_any(ch->trans_skb);
 719                 ch->trans_skb = NULL;
 720         }
 721
 722         ch->th_seg = 0x00;
 723         ch->th_seq_num = 0x00;
 724         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 725                 skb_queue_purge(&ch->io_queue);
 726                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 727         } else {
 728                 ctcm_purge_skb_queue(&ch->io_queue);
 729                 if (IS_MPC(ch))
 730                         ctcm_purge_skb_queue(&ch->sweep_queue);
 731                 spin_lock(&ch->collect_lock);
 732                 ctcm_purge_skb_queue(&ch->collect_queue);
 733                 ch->collect_len = 0;
 734                 spin_unlock(&ch->collect_lock);
 735                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 736         }
 737 }
 738
 739 /**
 740  * A channel has successfully been halted.
 741  * Cleanup it's queue and notify interface statemachine.
 742  *
 743  * fi           An instance of a channel statemachine.
 744  * event        The event, just happened.
 745  * arg          Generic pointer, casted from channel * upon call.
 746  */
 747 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg)
 748 {
 749         ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg);
 750 }
 751
 752 /**
 753  * A stop command from device statemachine arrived and we are in
 754  * not operational mode. Set state to stopped.
 755  *
 756  * fi           An instance of a channel statemachine.
 757  * event        The event, just happened.
 758  * arg          Generic pointer, casted from channel * upon call.
 759  */
 760 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg)
 761 {
 762         fsm_newstate(fi, CTC_STATE_STOPPED);
 763 }
 764
 765 /**
 766  * A machine check for no path, not operational status or gone device has
 767  * happened.
 768  * Cleanup queue and notify interface statemachine.
 769  *
 770  * fi           An instance of a channel statemachine.
 771  * event        The event, just happened.
 772  * arg          Generic pointer, casted from channel * upon call.
 773  */
 774 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg)
 775 {
 776         ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg);
 777 }
 778
 779 /**
 780  * Handle error during setup of channel.
 781  *
 782  * fi           An instance of a channel statemachine.
 783  * event        The event, just happened.
 784  * arg          Generic pointer, casted from channel * upon call.
 785  */
 786 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg)
 787 {
 788         struct channel *ch = arg;
 789         struct net_device *dev = ch->netdev;
 790         struct ctcm_priv *priv = dev->ml_priv;
 791
 792         /*
 793          * Special case: Got UC_RCRESET on setmode.
 794          * This means that remote side isn't setup. In this case
 795          * simply retry after some 10 secs...
 796          */
 797         if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) &&
 798             ((event == CTC_EVENT_UC_RCRESET) ||
 799              (event == CTC_EVENT_UC_RSRESET))) {
 800                 fsm_newstate(fi, CTC_STATE_STARTRETRY);
 801                 fsm_deltimer(&ch->timer);
 802                 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 803                 if (!IS_MPC(ch) &&
 804                     (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) {
 805                         int rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 806                         if (rc != 0)
 807                                 ctcm_ccw_check_rc(ch, rc,
 808                                         "HaltIO in chx_setuperr");
 809                 }
 810                 return;
 811         }
 812
 813         CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
 814                 "%s(%s) : %s error during %s channel setup state=%s\n",
 815                 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event],
 816                 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX",
 817                 fsm_getstate_str(fi));
 818
 819         if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
 820                 fsm_newstate(fi, CTC_STATE_RXERR);
 821                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 822         } else {
 823                 fsm_newstate(fi, CTC_STATE_TXERR);
 824                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 825         }
 826 }
 827
 828 /**
 829  * Restart a channel after an error.
 830  *
 831  * fi           An instance of a channel statemachine.
 832  * event        The event, just happened.
 833  * arg          Generic pointer, casted from channel * upon call.
 834  */
 835 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg)
 836 {
 837         struct channel *ch = arg;
 838         struct net_device *dev = ch->netdev;
 839         unsigned long saveflags = 0;
 840         int oldstate;
 841         int rc;
 842
 843         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 844                 "%s: %s[%d] of %s\n",
 845                         CTCM_FUNTAIL, ch->id, event, dev->name);
 846
 847         fsm_deltimer(&ch->timer);
 848
 849         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 850         oldstate = fsm_getstate(fi);
 851         fsm_newstate(fi, CTC_STATE_STARTWAIT);
 852         if (event == CTC_EVENT_TIMER)   /* only for timer not yet locked */
 853                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 854                         /* Such conditional locking is a known problem for
 855                          * sparse because its undeterministic in static view.
 856                          * Warnings should be ignored here. */
 857         rc = ccw_device_halt(ch->cdev, (unsigned long)ch);
 858         if (event == CTC_EVENT_TIMER)
 859                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 860         if (rc != 0) {
 861                 if (rc != -EBUSY) {
 862                     fsm_deltimer(&ch->timer);
 863                     fsm_newstate(fi, oldstate);
 864                 }
 865                 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart");
 866         }
 867 }
 868
 869 /**
 870  * Handle error during RX initial handshake (exchange of
 871  * 0-length block header)
 872  *
 873  * fi           An instance of a channel statemachine.
 874  * event        The event, just happened.
 875  * arg          Generic pointer, casted from channel * upon call.
 876  */
 877 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg)
 878 {
 879         struct channel *ch = arg;
 880         struct net_device *dev = ch->netdev;
 881         struct ctcm_priv *priv = dev->ml_priv;
 882
 883         if (event == CTC_EVENT_TIMER) {
 884                 if (!IS_MPCDEV(dev))
 885                         /* TODO : check if MPC deletes timer somewhere */
 886                         fsm_deltimer(&ch->timer);
 887                 if (ch->retry++ < 3)
 888                         ctcm_chx_restart(fi, event, arg);
 889                 else {
 890                         fsm_newstate(fi, CTC_STATE_RXERR);
 891                         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 892                 }
 893         } else {
 894                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 895                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 896                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 897
 898                 dev_warn(&dev->dev,
 899                         "Initialization failed with RX/TX init handshake "
 900                         "error %s\n", ctc_ch_event_names[event]);
 901         }
 902 }
 903
 904 /**
 905  * Notify device statemachine if we gave up initialization
 906  * of RX channel.
 907  *
 908  * fi           An instance of a channel statemachine.
 909  * event        The event, just happened.
 910  * arg          Generic pointer, casted from channel * upon call.
 911  */
 912 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg)
 913 {
 914         struct channel *ch = arg;
 915         struct net_device *dev = ch->netdev;
 916         struct ctcm_priv *priv = dev->ml_priv;
 917
 918         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 919                         "%s(%s): RX %s busy, init. fail",
 920                                 CTCM_FUNTAIL, dev->name, ch->id);
 921         fsm_newstate(fi, CTC_STATE_RXERR);
 922         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 923 }
 924
 925 /**
 926  * Handle RX Unit check remote reset (remote disconnected)
 927  *
 928  * fi           An instance of a channel statemachine.
 929  * event        The event, just happened.
 930  * arg          Generic pointer, casted from channel * upon call.
 931  */
 932 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg)
 933 {
 934         struct channel *ch = arg;
 935         struct channel *ch2;
 936         struct net_device *dev = ch->netdev;
 937         struct ctcm_priv *priv = dev->ml_priv;
 938
 939         CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
 940                         "%s: %s: remote disconnect - re-init ...",
 941                                 CTCM_FUNTAIL, dev->name);
 942         fsm_deltimer(&ch->timer);
 943         /*
 944          * Notify device statemachine
 945          */
 946         fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
 947         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 948
 949         fsm_newstate(fi, CTC_STATE_DTERM);
 950         ch2 = priv->channel[CTCM_WRITE];
 951         fsm_newstate(ch2->fsm, CTC_STATE_DTERM);
 952
 953         ccw_device_halt(ch->cdev, (unsigned long)ch);
 954         ccw_device_halt(ch2->cdev, (unsigned long)ch2);
 955 }
 956
 957 /**
 958  * Handle error during TX channel initialization.
 959  *
 960  * fi           An instance of a channel statemachine.
 961  * event        The event, just happened.
 962  * arg          Generic pointer, casted from channel * upon call.
 963  */
 964 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg)
 965 {
 966         struct channel *ch = arg;
 967         struct net_device *dev = ch->netdev;
 968         struct ctcm_priv *priv = dev->ml_priv;
 969
 970         if (event == CTC_EVENT_TIMER) {
 971                 fsm_deltimer(&ch->timer);
 972                 if (ch->retry++ < 3)
 973                         ctcm_chx_restart(fi, event, arg);
 974                 else {
 975                         fsm_newstate(fi, CTC_STATE_TXERR);
 976                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
 977                 }
 978         } else {
 979                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 980                         "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id,
 981                         ctc_ch_event_names[event], fsm_getstate_str(fi));
 982
 983                 dev_warn(&dev->dev,
 984                         "Initialization failed with RX/TX init handshake "
 985                         "error %s\n", ctc_ch_event_names[event]);
 986         }
 987 }
 988
 989 /**
 990  * Handle TX timeout by retrying operation.
 991  *
 992  * fi           An instance of a channel statemachine.
 993  * event        The event, just happened.
 994  * arg          Generic pointer, casted from channel * upon call.
 995  */
 996 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg)
 997 {
 998         struct channel *ch = arg;
 999         struct net_device *dev = ch->netdev;
1000         struct ctcm_priv *priv = dev->ml_priv;
1001         struct sk_buff *skb;
1002
1003         CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n",
1004                         __func__, smp_processor_id(), ch, ch->id);
1005
1006         fsm_deltimer(&ch->timer);
1007         if (ch->retry++ > 3) {
1008                 struct mpc_group *gptr = priv->mpcg;
1009                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1010                                 "%s: %s: retries exceeded",
1011                                         CTCM_FUNTAIL, ch->id);
1012                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1013                 /* call restart if not MPC or if MPC and mpcg fsm is ready.
1014                         use gptr as mpc indicator */
1015                 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY)))
1016                         ctcm_chx_restart(fi, event, arg);
1017                                 goto done;
1018         }
1019
1020         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1021                         "%s : %s: retry %d",
1022                                 CTCM_FUNTAIL, ch->id, ch->retry);
1023         skb = skb_peek(&ch->io_queue);
1024         if (skb) {
1025                 int rc = 0;
1026                 unsigned long saveflags = 0;
1027                 clear_normalized_cda(&ch->ccw[4]);
1028                 ch->ccw[4].count = skb->len;
1029                 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
1030                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO,
1031                                 "%s: %s: IDAL alloc failed",
1032                                                 CTCM_FUNTAIL, ch->id);
1033                         fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1034                         ctcm_chx_restart(fi, event, arg);
1035                                 goto done;
1036                 }
1037                 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch);
1038                 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */
1039                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1040                         /* Such conditional locking is a known problem for
1041                          * sparse because its undeterministic in static view.
1042                          * Warnings should be ignored here. */
1043                 if (do_debug_ccw)
1044                         ctcmpc_dumpit((char *)&ch->ccw[3],
1045                                         sizeof(struct ccw1) * 3);
1046
1047                 rc = ccw_device_start(ch->cdev, &ch->ccw[3],
1048                                                 (unsigned long)ch, 0xff, 0);
1049                 if (event == CTC_EVENT_TIMER)
1050                         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev),
1051                                         saveflags);
1052                 if (rc != 0) {
1053                         fsm_deltimer(&ch->timer);
1054                         ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry");
1055                         ctcm_purge_skb_queue(&ch->io_queue);
1056                 }
1057         }
1058 done:
1059         return;
1060 }
1061
1062 /**
1063  * Handle fatal errors during an I/O command.
1064  *
1065  * fi           An instance of a channel statemachine.
1066  * event        The event, just happened.
1067  * arg          Generic pointer, casted from channel * upon call.
1068  */
1069 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg)
1070 {
1071         struct channel *ch = arg;
1072         struct net_device *dev = ch->netdev;
1073         struct ctcm_priv *priv = dev->ml_priv;
1074         int rd = CHANNEL_DIRECTION(ch->flags);
1075
1076         fsm_deltimer(&ch->timer);
1077         CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1078                 "%s: %s: %s unrecoverable channel error",
1079                         CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX");
1080
1081         if (IS_MPC(ch)) {
1082                 priv->stats.tx_dropped++;
1083                 priv->stats.tx_errors++;
1084         }
1085         if (rd == CTCM_READ) {
1086                 fsm_newstate(fi, CTC_STATE_RXERR);
1087                 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev);
1088         } else {
1089                 fsm_newstate(fi, CTC_STATE_TXERR);
1090                 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev);
1091         }
1092 }
1093
1094 /*
1095  * The ctcm statemachine for a channel.
1096  */
1097 const fsm_node ch_fsm[] = {
1098         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1099         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1100         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1101         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1102
1103         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1104         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1105         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1106         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1107         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1108
1109         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1110         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1111         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1112         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1113         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1114         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1115
1116         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1117         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1118         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1119         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1120
1121         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1122         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1123         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      chx_firstio  },
1124         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1125         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1126         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1127         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1128         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1129
1130         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1131         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1132         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      chx_rxidle  },
1133         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1134         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1135         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1136         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1137         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1138         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      chx_firstio  },
1139         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1140
1141         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1142         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1143         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      chx_rx  },
1144         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
1145         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1146         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1147         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      chx_rx  },
1148
1149         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1150         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1151         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
1152         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
1153         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
1154         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
1155         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1156         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1157
1158         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1159         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
1160         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      chx_firstio  },
1161         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1162         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1163         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1164         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1165
1166         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
1167         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
1168         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
1169         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1170         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1171         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1172
1173         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1174         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
1175         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1176         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
1177         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
1178         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1179
1180         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
1181         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
1182         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      chx_txdone  },
1183         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_txretry  },
1184         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_txretry  },
1185         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
1186         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1187         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1188
1189         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1190         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1191         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1192         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1193 };
1194
1195 int ch_fsm_len = ARRAY_SIZE(ch_fsm);
1196
1197 /*
1198  * MPC actions for mpc channel statemachine
1199  * handling of MPC protocol requires extra
1200  * statemachine and actions which are prefixed ctcmpc_ .
1201  * The ctc_ch_states and ctc_ch_state_names,
1202  * ctc_ch_events and ctc_ch_event_names share the ctcm definitions
1203  * which are expanded by some elements.
1204  */
1205
1206 /*
1207  * Actions for mpc channel statemachine.
1208  */
1209
1210 /**
1211  * Normal data has been send. Free the corresponding
1212  * skb (it's in io_queue), reset dev->tbusy and
1213  * revert to idle state.
1214  *
1215  * fi           An instance of a channel statemachine.
1216  * event        The event, just happened.
1217  * arg          Generic pointer, casted from channel * upon call.
1218  */
1219 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg)
1220 {
1221         struct channel          *ch = arg;
1222         struct net_device       *dev = ch->netdev;
1223         struct ctcm_priv        *priv = dev->ml_priv;
1224         struct mpc_group        *grp = priv->mpcg;
1225         struct sk_buff          *skb;
1226         int             first = 1;
1227         int             i;
1228         __u32           data_space;
1229         unsigned long   duration;
1230         struct sk_buff  *peekskb;
1231         int             rc;
1232         struct th_header *header;
1233         struct pdu      *p_header;
1234         struct timespec done_stamp = current_kernel_time(); /* xtime */
1235
1236         CTCM_PR_DEBUG("Enter %s: %s cp:%i\n",
1237                         __func__, dev->name, smp_processor_id());
1238
1239         duration =
1240                 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 +
1241                 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000;
1242         if (duration > ch->prof.tx_time)
1243                 ch->prof.tx_time = duration;
1244
1245         if (ch->irb->scsw.cmd.count != 0)
1246                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1247                         "%s(%s): TX not complete, remaining %d bytes",
1248                              CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count);
1249         fsm_deltimer(&ch->timer);
1250         while ((skb = skb_dequeue(&ch->io_queue))) {
1251                 priv->stats.tx_packets++;
1252                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
1253                 if (first) {
1254                         priv->stats.tx_bytes += 2;
1255                         first = 0;
1256                 }
1257                 atomic_dec(&skb->users);
1258                 dev_kfree_skb_irq(skb);
1259         }
1260         spin_lock(&ch->collect_lock);
1261         clear_normalized_cda(&ch->ccw[4]);
1262         if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) {
1263                 spin_unlock(&ch->collect_lock);
1264                 fsm_newstate(fi, CTC_STATE_TXIDLE);
1265                                 goto done;
1266         }
1267
1268         if (ctcm_checkalloc_buffer(ch)) {
1269                 spin_unlock(&ch->collect_lock);
1270                                 goto done;
1271         }
1272         ch->trans_skb->data = ch->trans_skb_data;
1273         skb_reset_tail_pointer(ch->trans_skb);
1274         ch->trans_skb->len = 0;
1275         if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH))
1276                 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH;
1277         if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue))
1278                 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue);
1279         i = 0;
1280         p_header = NULL;
1281         data_space = grp->group_max_buflen - TH_HEADER_LENGTH;
1282
1283         CTCM_PR_DBGDATA("%s: building trans_skb from collect_q"
1284                        " data_space:%04x\n",
1285                        __func__, data_space);
1286
1287         while ((skb = skb_dequeue(&ch->collect_queue))) {
1288                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
1289                 p_header = (struct pdu *)
1290                         (skb_tail_pointer(ch->trans_skb) - skb->len);
1291                 p_header->pdu_flag = 0x00;
1292                 if (skb->protocol == ntohs(ETH_P_SNAP))
1293                         p_header->pdu_flag |= 0x60;
1294                 else
1295                         p_header->pdu_flag |= 0x20;
1296
1297                 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1298                                 __func__, ch->trans_skb->len);
1299                 CTCM_PR_DBGDATA("%s: pdu header and data for up"
1300                                 " to 32 bytes sent to vtam\n", __func__);
1301                 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32));
1302
1303                 ch->collect_len -= skb->len;
1304                 data_space -= skb->len;
1305                 priv->stats.tx_packets++;
1306                 priv->stats.tx_bytes += skb->len;
1307                 atomic_dec(&skb->users);
1308                 dev_kfree_skb_any(skb);
1309                 peekskb = skb_peek(&ch->collect_queue);
1310                 if (peekskb->len > data_space)
1311                         break;
1312                 i++;
1313         }
1314         /* p_header points to the last one we handled */
1315         if (p_header)
1316                 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/
1317         header = kzalloc(TH_HEADER_LENGTH, gfp_type());
1318         if (!header) {
1319                 spin_unlock(&ch->collect_lock);
1320                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1321                                 goto done;
1322         }
1323         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
1324         ch->th_seq_num++;
1325         header->th_seq_num = ch->th_seq_num;
1326
1327         CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" ,
1328                                         __func__, ch->th_seq_num);
1329
1330         memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header,
1331                 TH_HEADER_LENGTH);      /* put the TH on the packet */
1332
1333         kfree(header);
1334
1335         CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n",
1336                        __func__, ch->trans_skb->len);
1337         CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb "
1338                         "data to vtam from collect_q\n", __func__);
1339         CTCM_D3_DUMP((char *)ch->trans_skb->data,
1340                                 min_t(int, ch->trans_skb->len, 50));
1341
1342         spin_unlock(&ch->collect_lock);
1343         clear_normalized_cda(&ch->ccw[1]);
1344
1345         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1346                         (void *)(unsigned long)ch->ccw[1].cda,
1347                         ch->trans_skb->data);
1348         ch->ccw[1].count = ch->max_bufsize;
1349
1350         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
1351                 dev_kfree_skb_any(ch->trans_skb);
1352                 ch->trans_skb = NULL;
1353                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
1354                         "%s: %s: IDAL alloc failed",
1355                                 CTCM_FUNTAIL, ch->id);
1356                 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1357                 return;
1358         }
1359
1360         CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n",
1361                         (void *)(unsigned long)ch->ccw[1].cda,
1362                         ch->trans_skb->data);
1363
1364         ch->ccw[1].count = ch->trans_skb->len;
1365         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
1366         ch->prof.send_stamp = current_kernel_time(); /* xtime */
1367         if (do_debug_ccw)
1368                 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1369         rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1370                                         (unsigned long)ch, 0xff, 0);
1371         ch->prof.doios_multi++;
1372         if (rc != 0) {
1373                 priv->stats.tx_dropped += i;
1374                 priv->stats.tx_errors += i;
1375                 fsm_deltimer(&ch->timer);
1376                 ctcm_ccw_check_rc(ch, rc, "chained TX");
1377         }
1378 done:
1379         ctcm_clear_busy(dev);
1380         return;
1381 }
1382
1383 /**
1384  * Got normal data, check for sanity, queue it up, allocate new buffer
1385  * trigger bottom half, and initiate next read.
1386  *
1387  * fi           An instance of a channel statemachine.
1388  * event        The event, just happened.
1389  * arg          Generic pointer, casted from channel * upon call.
1390  */
1391 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg)
1392 {
1393         struct channel          *ch = arg;
1394         struct net_device       *dev = ch->netdev;
1395         struct ctcm_priv        *priv = dev->ml_priv;
1396         struct mpc_group        *grp = priv->mpcg;
1397         struct sk_buff          *skb = ch->trans_skb;
1398         struct sk_buff          *new_skb;
1399         unsigned long           saveflags = 0;  /* avoids compiler warning */
1400         int len = ch->max_bufsize - ch->irb->scsw.cmd.count;
1401
1402         CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n",
1403                         CTCM_FUNTAIL, dev->name, smp_processor_id(),
1404                                 ch->id, ch->max_bufsize, len);
1405         fsm_deltimer(&ch->timer);
1406
1407         if (skb == NULL) {
1408                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1409                         "%s(%s): TRANS_SKB = NULL",
1410                                 CTCM_FUNTAIL, dev->name);
1411                         goto again;
1412         }
1413
1414         if (len < TH_HEADER_LENGTH) {
1415                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1416                                 "%s(%s): packet length %d to short",
1417                                         CTCM_FUNTAIL, dev->name, len);
1418                 priv->stats.rx_dropped++;
1419                 priv->stats.rx_length_errors++;
1420         } else {
1421                 /* must have valid th header or game over */
1422                 __u32   block_len = len;
1423                 len = TH_HEADER_LENGTH + XID2_LENGTH + 4;
1424                 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC);
1425
1426                 if (new_skb == NULL) {
1427                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1428                                 "%s(%d): skb allocation failed",
1429                                                 CTCM_FUNTAIL, dev->name);
1430                         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
1431                                         goto again;
1432                 }
1433                 switch (fsm_getstate(grp->fsm)) {
1434                 case MPCG_STATE_RESET:
1435                 case MPCG_STATE_INOP:
1436                         dev_kfree_skb_any(new_skb);
1437                         break;
1438                 case MPCG_STATE_FLOWC:
1439                 case MPCG_STATE_READY:
1440                         memcpy(skb_put(new_skb, block_len),
1441                                                skb->data, block_len);
1442                         skb_queue_tail(&ch->io_queue, new_skb);
1443                         tasklet_schedule(&ch->ch_tasklet);
1444                         break;
1445                 default:
1446                         memcpy(skb_put(new_skb, len), skb->data, len);
1447                         skb_queue_tail(&ch->io_queue, new_skb);
1448                         tasklet_hi_schedule(&ch->ch_tasklet);
1449                         break;
1450                 }
1451         }
1452
1453 again:
1454         switch (fsm_getstate(grp->fsm)) {
1455         int rc, dolock;
1456         case MPCG_STATE_FLOWC:
1457         case MPCG_STATE_READY:
1458                 if (ctcm_checkalloc_buffer(ch))
1459                         break;
1460                 ch->trans_skb->data = ch->trans_skb_data;
1461                 skb_reset_tail_pointer(ch->trans_skb);
1462                 ch->trans_skb->len = 0;
1463                 ch->ccw[1].count = ch->max_bufsize;
1464                         if (do_debug_ccw)
1465                         ctcmpc_dumpit((char *)&ch->ccw[0],
1466                                         sizeof(struct ccw1) * 3);
1467                 dolock = !in_irq();
1468                 if (dolock)
1469                         spin_lock_irqsave(
1470                                 get_ccwdev_lock(ch->cdev), saveflags);
1471                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1472                                                 (unsigned long)ch, 0xff, 0);
1473                 if (dolock) /* see remark about conditional locking */
1474                         spin_unlock_irqrestore(
1475                                 get_ccwdev_lock(ch->cdev), saveflags);
1476                 if (rc != 0)
1477                         ctcm_ccw_check_rc(ch, rc, "normal RX");
1478         default:
1479                 break;
1480         }
1481
1482         CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n",
1483                         __func__, dev->name, ch, ch->id);
1484
1485 }
1486
1487 /**
1488  * Initialize connection by sending a __u16 of value 0.
1489  *
1490  * fi           An instance of a channel statemachine.
1491  * event        The event, just happened.
1492  * arg          Generic pointer, casted from channel * upon call.
1493  */
1494 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg)
1495 {
1496         struct channel          *ch = arg;
1497         struct net_device       *dev = ch->netdev;
1498         struct ctcm_priv        *priv = dev->ml_priv;
1499         struct mpc_group        *gptr = priv->mpcg;
1500
1501         CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n",
1502                                 __func__, ch->id, ch);
1503
1504         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1505                         "%s: %s: chstate:%i, grpstate:%i, prot:%i\n",
1506                         CTCM_FUNTAIL, ch->id, fsm_getstate(fi),
1507                         fsm_getstate(gptr->fsm), ch->protocol);
1508
1509         if (fsm_getstate(fi) == CTC_STATE_TXIDLE)
1510                 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? ");
1511
1512         fsm_deltimer(&ch->timer);
1513         if (ctcm_checkalloc_buffer(ch))
1514                                 goto done;
1515
1516         switch (fsm_getstate(fi)) {
1517         case CTC_STATE_STARTRETRY:
1518         case CTC_STATE_SETUPWAIT:
1519                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) {
1520                         ctcmpc_chx_rxidle(fi, event, arg);
1521                 } else {
1522                         fsm_newstate(fi, CTC_STATE_TXIDLE);
1523                         fsm_event(priv->fsm, DEV_EVENT_TXUP, dev);
1524                 }
1525                                 goto done;
1526         default:
1527                 break;
1528         };
1529
1530         fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
1531                      ? CTC_STATE_RXINIT : CTC_STATE_TXINIT);
1532
1533 done:
1534         CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n",
1535                                 __func__, ch->id, ch);
1536         return;
1537 }
1538
1539 /**
1540  * Got initial data, check it. If OK,
1541  * notify device statemachine that we are up and
1542  * running.
1543  *
1544  * fi           An instance of a channel statemachine.
1545  * event        The event, just happened.
1546  * arg          Generic pointer, casted from channel * upon call.
1547  */
1548 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg)
1549 {
1550         struct channel *ch = arg;
1551         struct net_device *dev = ch->netdev;
1552         struct ctcm_priv  *priv = dev->ml_priv;
1553         struct mpc_group  *grp = priv->mpcg;
1554         int rc;
1555         unsigned long saveflags = 0;    /* avoids compiler warning */
1556
1557         fsm_deltimer(&ch->timer);
1558         CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n",
1559                         __func__, ch->id, dev->name, smp_processor_id(),
1560                                 fsm_getstate(fi), fsm_getstate(grp->fsm));
1561
1562         fsm_newstate(fi, CTC_STATE_RXIDLE);
1563         /* XID processing complete */
1564
1565         switch (fsm_getstate(grp->fsm)) {
1566         case MPCG_STATE_FLOWC:
1567         case MPCG_STATE_READY:
1568                 if (ctcm_checkalloc_buffer(ch))
1569                                 goto done;
1570                 ch->trans_skb->data = ch->trans_skb_data;
1571                 skb_reset_tail_pointer(ch->trans_skb);
1572                 ch->trans_skb->len = 0;
1573                 ch->ccw[1].count = ch->max_bufsize;
1574                 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3);
1575                 if (event == CTC_EVENT_START)
1576                         /* see remark about conditional locking */
1577                         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1578                 rc = ccw_device_start(ch->cdev, &ch->ccw[0],
1579                                                 (unsigned long)ch, 0xff, 0);
1580                 if (event == CTC_EVENT_START)
1581                         spin_unlock_irqrestore(
1582                                         get_ccwdev_lock(ch->cdev), saveflags);
1583                 if (rc != 0) {
1584                         fsm_newstate(fi, CTC_STATE_RXINIT);
1585                         ctcm_ccw_check_rc(ch, rc, "initial RX");
1586                                 goto done;
1587                 }
1588                 break;
1589         default:
1590                 break;
1591         }
1592
1593         fsm_event(priv->fsm, DEV_EVENT_RXUP, dev);
1594 done:
1595         return;
1596 }
1597
1598 /*
1599  * ctcmpc channel FSM action
1600  * called from several points in ctcmpc_ch_fsm
1601  * ctcmpc only
1602  */
1603 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg)
1604 {
1605         struct channel    *ch     = arg;
1606         struct net_device *dev    = ch->netdev;
1607         struct ctcm_priv  *priv   = dev->ml_priv;
1608         struct mpc_group  *grp = priv->mpcg;
1609
1610         CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n",
1611                 __func__, dev->name, ch->id, ch, smp_processor_id(),
1612                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1613
1614         switch (fsm_getstate(grp->fsm)) {
1615         case MPCG_STATE_XID2INITW:
1616                 /* ok..start yside xid exchanges */
1617                 if (!ch->in_mpcgroup)
1618                         break;
1619                 if (fsm_getstate(ch->fsm) ==  CH_XID0_PENDING) {
1620                         fsm_deltimer(&grp->timer);
1621                         fsm_addtimer(&grp->timer,
1622                                 MPC_XID_TIMEOUT_VALUE,
1623                                 MPCG_EVENT_TIMER, dev);
1624                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1625
1626                 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1627                         /* attn rcvd before xid0 processed via bh */
1628                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1629                 break;
1630         case MPCG_STATE_XID2INITX:
1631         case MPCG_STATE_XID0IOWAIT:
1632         case MPCG_STATE_XID0IOWAIX:
1633                 /* attn rcvd before xid0 processed on ch
1634                 but mid-xid0 processing for group    */
1635                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1)
1636                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1637                 break;
1638         case MPCG_STATE_XID7INITW:
1639         case MPCG_STATE_XID7INITX:
1640         case MPCG_STATE_XID7INITI:
1641         case MPCG_STATE_XID7INITZ:
1642                 switch (fsm_getstate(ch->fsm)) {
1643                 case CH_XID7_PENDING:
1644                         fsm_newstate(ch->fsm, CH_XID7_PENDING1);
1645                         break;
1646                 case CH_XID7_PENDING2:
1647                         fsm_newstate(ch->fsm, CH_XID7_PENDING3);
1648                         break;
1649                 }
1650                 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
1651                 break;
1652         }
1653
1654         return;
1655 }
1656
1657 /*
1658  * ctcmpc channel FSM action
1659  * called from one point in ctcmpc_ch_fsm
1660  * ctcmpc only
1661  */
1662 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg)
1663 {
1664         struct channel    *ch     = arg;
1665         struct net_device *dev    = ch->netdev;
1666         struct ctcm_priv  *priv   = dev->ml_priv;
1667         struct mpc_group  *grp    = priv->mpcg;
1668
1669         CTCM_PR_DEBUG("%s(%s): %s\n  ChState:%s GrpState:%s\n",
1670                         __func__, dev->name, ch->id,
1671                         fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm));
1672
1673         fsm_deltimer(&ch->timer);
1674
1675         switch (fsm_getstate(grp->fsm)) {
1676         case MPCG_STATE_XID0IOWAIT:
1677                 /* vtam wants to be primary.start yside xid exchanges*/
1678                 /* only receive one attn-busy at a time so must not  */
1679                 /* change state each time                            */
1680                 grp->changed_side = 1;
1681                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1682                 break;
1683         case MPCG_STATE_XID2INITW:
1684                 if (grp->changed_side == 1) {
1685                         grp->changed_side = 2;
1686                         break;
1687                 }
1688                 /* process began via call to establish_conn      */
1689                 /* so must report failure instead of reverting   */
1690                 /* back to ready-for-xid passive state           */
1691                 if (grp->estconnfunc)
1692                                 goto done;
1693                 /* this attnbusy is NOT the result of xside xid  */
1694                 /* collisions so yside must have been triggered  */
1695                 /* by an ATTN that was not intended to start XID */
1696                 /* processing. Revert back to ready-for-xid and  */
1697                 /* wait for ATTN interrupt to signal xid start   */
1698                 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) {
1699                         fsm_newstate(ch->fsm, CH_XID0_PENDING) ;
1700                         fsm_deltimer(&grp->timer);
1701                                 goto done;
1702                 }
1703                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1704                                 goto done;
1705         case MPCG_STATE_XID2INITX:
1706                 /* XID2 was received before ATTN Busy for second
1707                    channel.Send yside xid for second channel.
1708                 */
1709                 if (grp->changed_side == 1) {
1710                         grp->changed_side = 2;
1711                         break;
1712                 }
1713         case MPCG_STATE_XID0IOWAIX:
1714         case MPCG_STATE_XID7INITW:
1715         case MPCG_STATE_XID7INITX:
1716         case MPCG_STATE_XID7INITI:
1717         case MPCG_STATE_XID7INITZ:
1718         default:
1719                 /* multiple attn-busy indicates too out-of-sync      */
1720                 /* and they are certainly not being received as part */
1721                 /* of valid mpc group negotiations..                 */
1722                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1723                                 goto done;
1724         }
1725
1726         if (grp->changed_side == 1) {
1727                 fsm_deltimer(&grp->timer);
1728                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
1729                              MPCG_EVENT_TIMER, dev);
1730         }
1731         if (ch->in_mpcgroup)
1732                 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1733         else
1734                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1735                         "%s(%s): channel %s not added to group",
1736                                 CTCM_FUNTAIL, dev->name, ch->id);
1737
1738 done:
1739         return;
1740 }
1741
1742 /*
1743  * ctcmpc channel FSM action
1744  * called from several points in ctcmpc_ch_fsm
1745  * ctcmpc only
1746  */
1747 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg)
1748 {
1749         struct channel     *ch     = arg;
1750         struct net_device  *dev    = ch->netdev;
1751         struct ctcm_priv   *priv   = dev->ml_priv;
1752         struct mpc_group   *grp    = priv->mpcg;
1753
1754         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch);
1755         return;
1756 }
1757
1758 /*
1759  * ctcmpc channel FSM action
1760  * called from several points in ctcmpc_ch_fsm
1761  * ctcmpc only
1762  */
1763 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg)
1764 {
1765         struct channel *ach = arg;
1766         struct net_device *dev = ach->netdev;
1767         struct ctcm_priv *priv = dev->ml_priv;
1768         struct mpc_group *grp = priv->mpcg;
1769         struct channel *wch = priv->channel[CTCM_WRITE];
1770         struct channel *rch = priv->channel[CTCM_READ];
1771         struct sk_buff *skb;
1772         struct th_sweep *header;
1773         int rc = 0;
1774         unsigned long saveflags = 0;
1775
1776         CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n",
1777                         __func__, smp_processor_id(), ach, ach->id);
1778
1779         if (grp->in_sweep == 0)
1780                                 goto done;
1781
1782         CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" ,
1783                                 __func__, wch->th_seq_num);
1784         CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" ,
1785                                 __func__, rch->th_seq_num);
1786
1787         if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) {
1788                 /* give the previous IO time to complete */
1789                 fsm_addtimer(&wch->sweep_timer,
1790                         200, CTC_EVENT_RSWEEP_TIMER, wch);
1791                                 goto done;
1792         }
1793
1794         skb = skb_dequeue(&wch->sweep_queue);
1795         if (!skb)
1796                                 goto done;
1797
1798         if (set_normalized_cda(&wch->ccw[4], skb->data)) {
1799                 grp->in_sweep = 0;
1800                 ctcm_clear_busy_do(dev);
1801                 dev_kfree_skb_any(skb);
1802                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1803                                 goto done;
1804         } else {
1805                 atomic_inc(&skb->users);
1806                 skb_queue_tail(&wch->io_queue, skb);
1807         }
1808
1809         /* send out the sweep */
1810         wch->ccw[4].count = skb->len;
1811
1812         header = (struct th_sweep *)skb->data;
1813         switch (header->th.th_ch_flag) {
1814         case TH_SWEEP_REQ:
1815                 grp->sweep_req_pend_num--;
1816                 break;
1817         case TH_SWEEP_RESP:
1818                 grp->sweep_rsp_pend_num--;
1819                 break;
1820         }
1821
1822         header->sw.th_last_seq = wch->th_seq_num;
1823
1824         CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3);
1825         CTCM_PR_DBGDATA("%s: sweep packet\n", __func__);
1826         CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH);
1827
1828         fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch);
1829         fsm_newstate(wch->fsm, CTC_STATE_TX);
1830
1831         spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags);
1832         wch->prof.send_stamp = current_kernel_time(); /* xtime */
1833         rc = ccw_device_start(wch->cdev, &wch->ccw[3],
1834                                         (unsigned long) wch, 0xff, 0);
1835         spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags);
1836
1837         if ((grp->sweep_req_pend_num == 0) &&
1838            (grp->sweep_rsp_pend_num == 0)) {
1839                 grp->in_sweep = 0;
1840                 rch->th_seq_num = 0x00;
1841                 wch->th_seq_num = 0x00;
1842                 ctcm_clear_busy_do(dev);
1843         }
1844
1845         CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" ,
1846                         __func__, wch->th_seq_num, rch->th_seq_num);
1847
1848         if (rc != 0)
1849                 ctcm_ccw_check_rc(wch, rc, "send sweep");
1850
1851 done:
1852         return;
1853 }
1854
1855
1856 /*
1857  * The ctcmpc statemachine for a channel.
1858  */
1859
1860 const fsm_node ctcmpc_ch_fsm[] = {
1861         { CTC_STATE_STOPPED,    CTC_EVENT_STOP,         ctcm_action_nop  },
1862         { CTC_STATE_STOPPED,    CTC_EVENT_START,        ctcm_chx_start  },
1863         { CTC_STATE_STOPPED,    CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1864         { CTC_STATE_STOPPED,    CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1865         { CTC_STATE_STOPPED,    CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1866
1867         { CTC_STATE_NOTOP,      CTC_EVENT_STOP,         ctcm_chx_stop  },
1868         { CTC_STATE_NOTOP,      CTC_EVENT_START,        ctcm_action_nop  },
1869         { CTC_STATE_NOTOP,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1870         { CTC_STATE_NOTOP,      CTC_EVENT_MC_FAIL,      ctcm_action_nop  },
1871         { CTC_STATE_NOTOP,      CTC_EVENT_MC_GOOD,      ctcm_chx_start  },
1872         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RCRESET,   ctcm_chx_stop  },
1873         { CTC_STATE_NOTOP,      CTC_EVENT_UC_RSRESET,   ctcm_chx_stop  },
1874         { CTC_STATE_NOTOP,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1875
1876         { CTC_STATE_STARTWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1877         { CTC_STATE_STARTWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1878         { CTC_STATE_STARTWAIT,  CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1879         { CTC_STATE_STARTWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setuperr  },
1880         { CTC_STATE_STARTWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1881         { CTC_STATE_STARTWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1882
1883         { CTC_STATE_STARTRETRY, CTC_EVENT_STOP,         ctcm_chx_haltio  },
1884         { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1885         { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
1886         { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1887         { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1888
1889         { CTC_STATE_SETUPWAIT,  CTC_EVENT_STOP,         ctcm_chx_haltio  },
1890         { CTC_STATE_SETUPWAIT,  CTC_EVENT_START,        ctcm_action_nop  },
1891         { CTC_STATE_SETUPWAIT,  CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
1892         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1893         { CTC_STATE_SETUPWAIT,  CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1894         { CTC_STATE_SETUPWAIT,  CTC_EVENT_TIMER,        ctcm_chx_setmode  },
1895         { CTC_STATE_SETUPWAIT,  CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1896         { CTC_STATE_SETUPWAIT,  CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1897
1898         { CTC_STATE_RXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1899         { CTC_STATE_RXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
1900         { CTC_STATE_RXINIT,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rxidle  },
1901         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxiniterr  },
1902         { CTC_STATE_RXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_rxiniterr  },
1903         { CTC_STATE_RXINIT,     CTC_EVENT_TIMER,        ctcm_chx_rxiniterr  },
1904         { CTC_STATE_RXINIT,     CTC_EVENT_ATTNBUSY,     ctcm_chx_rxinitfail  },
1905         { CTC_STATE_RXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1906         { CTC_STATE_RXINIT,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_firstio  },
1907         { CTC_STATE_RXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1908
1909         { CH_XID0_PENDING,      CTC_EVENT_FINSTAT,      ctcm_action_nop  },
1910         { CH_XID0_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1911         { CH_XID0_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1912         { CH_XID0_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1913         { CH_XID0_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1914         { CH_XID0_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1915         { CH_XID0_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1916         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1917         { CH_XID0_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1918         { CH_XID0_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1919
1920         { CH_XID0_INPROGRESS,   CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1921         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1922         { CH_XID0_INPROGRESS,   CTC_EVENT_STOP,         ctcm_chx_haltio  },
1923         { CH_XID0_INPROGRESS,   CTC_EVENT_START,        ctcm_action_nop  },
1924         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1925         { CH_XID0_INPROGRESS,   CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1926         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1927         { CH_XID0_INPROGRESS,   CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr },
1928         { CH_XID0_INPROGRESS,   CTC_EVENT_ATTNBUSY,     ctcmpc_chx_attnbusy  },
1929         { CH_XID0_INPROGRESS,   CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1930         { CH_XID0_INPROGRESS,   CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1931
1932         { CH_XID7_PENDING,      CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1933         { CH_XID7_PENDING,      CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1934         { CH_XID7_PENDING,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
1935         { CH_XID7_PENDING,      CTC_EVENT_START,        ctcm_action_nop  },
1936         { CH_XID7_PENDING,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1937         { CH_XID7_PENDING,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1938         { CH_XID7_PENDING,      CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1939         { CH_XID7_PENDING,      CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1940         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1941         { CH_XID7_PENDING,      CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1942         { CH_XID7_PENDING,      CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1943         { CH_XID7_PENDING,      CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1944         { CH_XID7_PENDING,      CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1945
1946         { CH_XID7_PENDING1,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1947         { CH_XID7_PENDING1,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1948         { CH_XID7_PENDING1,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1949         { CH_XID7_PENDING1,     CTC_EVENT_START,        ctcm_action_nop  },
1950         { CH_XID7_PENDING1,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1951         { CH_XID7_PENDING1,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1952         { CH_XID7_PENDING1,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1953         { CH_XID7_PENDING1,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1954         { CH_XID7_PENDING1,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1955         { CH_XID7_PENDING1,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1956         { CH_XID7_PENDING1,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1957         { CH_XID7_PENDING1,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1958
1959         { CH_XID7_PENDING2,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1960         { CH_XID7_PENDING2,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1961         { CH_XID7_PENDING2,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1962         { CH_XID7_PENDING2,     CTC_EVENT_START,        ctcm_action_nop  },
1963         { CH_XID7_PENDING2,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1964         { CH_XID7_PENDING2,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1965         { CH_XID7_PENDING2,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1966         { CH_XID7_PENDING2,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1967         { CH_XID7_PENDING2,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1968         { CH_XID7_PENDING2,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1969         { CH_XID7_PENDING2,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1970         { CH_XID7_PENDING2,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1971
1972         { CH_XID7_PENDING3,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1973         { CH_XID7_PENDING3,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1974         { CH_XID7_PENDING3,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1975         { CH_XID7_PENDING3,     CTC_EVENT_START,        ctcm_action_nop  },
1976         { CH_XID7_PENDING3,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1977         { CH_XID7_PENDING3,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1978         { CH_XID7_PENDING3,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1979         { CH_XID7_PENDING3,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1980         { CH_XID7_PENDING3,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1981         { CH_XID7_PENDING3,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1982         { CH_XID7_PENDING3,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1983         { CH_XID7_PENDING3,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1984
1985         { CH_XID7_PENDING4,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
1986         { CH_XID7_PENDING4,     CTC_EVENT_ATTN,         ctcmpc_chx_attn  },
1987         { CH_XID7_PENDING4,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1988         { CH_XID7_PENDING4,     CTC_EVENT_START,        ctcm_action_nop  },
1989         { CH_XID7_PENDING4,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
1990         { CH_XID7_PENDING4,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
1991         { CH_XID7_PENDING4,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
1992         { CH_XID7_PENDING4,     CTC_EVENT_UC_RCRESET,   ctcm_chx_setuperr  },
1993         { CH_XID7_PENDING4,     CTC_EVENT_UC_RSRESET,   ctcm_chx_setuperr  },
1994         { CH_XID7_PENDING4,     CTC_EVENT_ATTNBUSY,     ctcm_chx_iofatal  },
1995         { CH_XID7_PENDING4,     CTC_EVENT_TIMER,        ctcmpc_chx_resend  },
1996         { CH_XID7_PENDING4,     CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
1997
1998         { CTC_STATE_RXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
1999         { CTC_STATE_RXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2000         { CTC_STATE_RXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_rx  },
2001         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_rxdisc  },
2002         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2003         { CTC_STATE_RXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2004         { CTC_STATE_RXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2005         { CTC_STATE_RXIDLE,     CTC_EVENT_UC_ZERO,      ctcmpc_chx_rx  },
2006
2007         { CTC_STATE_TXINIT,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2008         { CTC_STATE_TXINIT,     CTC_EVENT_START,        ctcm_action_nop  },
2009         { CTC_STATE_TXINIT,     CTC_EVENT_FINSTAT,      ctcm_chx_txidle  },
2010         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RCRESET,   ctcm_chx_txiniterr  },
2011         { CTC_STATE_TXINIT,     CTC_EVENT_UC_RSRESET,   ctcm_chx_txiniterr  },
2012         { CTC_STATE_TXINIT,     CTC_EVENT_TIMER,        ctcm_chx_txiniterr  },
2013         { CTC_STATE_TXINIT,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2014         { CTC_STATE_TXINIT,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2015         { CTC_STATE_TXINIT,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2016
2017         { CTC_STATE_TXIDLE,     CTC_EVENT_STOP,         ctcm_chx_haltio  },
2018         { CTC_STATE_TXIDLE,     CTC_EVENT_START,        ctcm_action_nop  },
2019         { CTC_STATE_TXIDLE,     CTC_EVENT_FINSTAT,      ctcmpc_chx_firstio  },
2020         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2021         { CTC_STATE_TXIDLE,     CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2022         { CTC_STATE_TXIDLE,     CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2023         { CTC_STATE_TXIDLE,     CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2024         { CTC_STATE_TXIDLE,     CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2025
2026         { CTC_STATE_TERM,       CTC_EVENT_STOP,         ctcm_action_nop  },
2027         { CTC_STATE_TERM,       CTC_EVENT_START,        ctcm_chx_restart  },
2028         { CTC_STATE_TERM,       CTC_EVENT_FINSTAT,      ctcm_chx_stopped  },
2029         { CTC_STATE_TERM,       CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2030         { CTC_STATE_TERM,       CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2031         { CTC_STATE_TERM,       CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2032         { CTC_STATE_TERM,       CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2033         { CTC_STATE_TERM,       CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2034
2035         { CTC_STATE_DTERM,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2036         { CTC_STATE_DTERM,      CTC_EVENT_START,        ctcm_chx_restart  },
2037         { CTC_STATE_DTERM,      CTC_EVENT_FINSTAT,      ctcm_chx_setmode  },
2038         { CTC_STATE_DTERM,      CTC_EVENT_UC_RCRESET,   ctcm_action_nop  },
2039         { CTC_STATE_DTERM,      CTC_EVENT_UC_RSRESET,   ctcm_action_nop  },
2040         { CTC_STATE_DTERM,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2041         { CTC_STATE_DTERM,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2042
2043         { CTC_STATE_TX,         CTC_EVENT_STOP,         ctcm_chx_haltio  },
2044         { CTC_STATE_TX,         CTC_EVENT_START,        ctcm_action_nop  },
2045         { CTC_STATE_TX,         CTC_EVENT_FINSTAT,      ctcmpc_chx_txdone  },
2046         { CTC_STATE_TX,         CTC_EVENT_UC_RCRESET,   ctcm_chx_fail  },
2047         { CTC_STATE_TX,         CTC_EVENT_UC_RSRESET,   ctcm_chx_fail  },
2048         { CTC_STATE_TX,         CTC_EVENT_TIMER,        ctcm_chx_txretry  },
2049         { CTC_STATE_TX,         CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2050         { CTC_STATE_TX,         CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2051         { CTC_STATE_TX,         CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep },
2052         { CTC_STATE_TX,         CTC_EVENT_IO_EBUSY,     ctcm_chx_fail  },
2053
2054         { CTC_STATE_RXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2055         { CTC_STATE_TXERR,      CTC_EVENT_STOP,         ctcm_chx_haltio  },
2056         { CTC_STATE_TXERR,      CTC_EVENT_IO_ENODEV,    ctcm_chx_iofatal  },
2057         { CTC_STATE_TXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2058         { CTC_STATE_RXERR,      CTC_EVENT_MC_FAIL,      ctcm_chx_fail  },
2059 };
2060
2061 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm);
2062
2063 /*
2064  * Actions for interface - statemachine.
2065  */
2066
2067 /**
2068  * Startup channels by sending CTC_EVENT_START to each channel.
2069  *
2070  * fi           An instance of an interface statemachine.
2071  * event        The event, just happened.
2072  * arg          Generic pointer, casted from struct net_device * upon call.
2073  */
2074 static void dev_action_start(fsm_instance *fi, int event, void *arg)
2075 {
2076         struct net_device *dev = arg;
2077         struct ctcm_priv *priv = dev->ml_priv;
2078         int direction;
2079
2080         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2081
2082         fsm_deltimer(&priv->restart_timer);
2083         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2084         if (IS_MPC(priv))
2085                 priv->mpcg->channels_terminating = 0;
2086         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2087                 struct channel *ch = priv->channel[direction];
2088                 fsm_event(ch->fsm, CTC_EVENT_START, ch);
2089         }
2090 }
2091
2092 /**
2093  * Shutdown channels by sending CTC_EVENT_STOP to each channel.
2094  *
2095  * fi           An instance of an interface statemachine.
2096  * event        The event, just happened.
2097  * arg          Generic pointer, casted from struct net_device * upon call.
2098  */
2099 static void dev_action_stop(fsm_instance *fi, int event, void *arg)
2100 {
2101         int direction;
2102         struct net_device *dev = arg;
2103         struct ctcm_priv *priv = dev->ml_priv;
2104
2105         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2106
2107         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2108         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
2109                 struct channel *ch = priv->channel[direction];
2110                 fsm_event(ch->fsm, CTC_EVENT_STOP, ch);
2111                 ch->th_seq_num = 0x00;
2112                 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n",
2113                                 __func__, ch->th_seq_num);
2114         }
2115         if (IS_MPC(priv))
2116                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2117 }
2118
2119 static void dev_action_restart(fsm_instance *fi, int event, void *arg)
2120 {
2121         int restart_timer;
2122         struct net_device *dev = arg;
2123         struct ctcm_priv *priv = dev->ml_priv;
2124
2125         CTCMY_DBF_DEV_NAME(TRACE, dev, "");
2126
2127         if (IS_MPC(priv)) {
2128                 restart_timer = CTCM_TIME_1_SEC;
2129         } else {
2130                 restart_timer = CTCM_TIME_5_SEC;
2131         }
2132         dev_info(&dev->dev, "Restarting device\n");
2133
2134         dev_action_stop(fi, event, arg);
2135         fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
2136         if (IS_MPC(priv))
2137                 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET);
2138
2139         /* going back into start sequence too quickly can         */
2140         /* result in the other side becoming unreachable   due    */
2141         /* to sense reported when IO is aborted                   */
2142         fsm_addtimer(&priv->restart_timer, restart_timer,
2143                         DEV_EVENT_START, dev);
2144 }
2145
2146 /**
2147  * Called from channel statemachine
2148  * when a channel is up and running.
2149  *
2150  * fi           An instance of an interface statemachine.
2151  * event        The event, just happened.
2152  * arg          Generic pointer, casted from struct net_device * upon call.
2153  */
2154 static void dev_action_chup(fsm_instance *fi, int event, void *arg)
2155 {
2156         struct net_device *dev = arg;
2157         struct ctcm_priv *priv = dev->ml_priv;
2158         int dev_stat = fsm_getstate(fi);
2159
2160         CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE,
2161                         "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL,
2162                                 dev->name, dev->ml_priv, dev_stat, event);
2163
2164         switch (fsm_getstate(fi)) {
2165         case DEV_STATE_STARTWAIT_RXTX:
2166                 if (event == DEV_EVENT_RXUP)
2167                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2168                 else
2169                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2170                 break;
2171         case DEV_STATE_STARTWAIT_RX:
2172                 if (event == DEV_EVENT_RXUP) {
2173                         fsm_newstate(fi, DEV_STATE_RUNNING);
2174                         dev_info(&dev->dev,
2175                                 "Connected with remote side\n");
2176                         ctcm_clear_busy(dev);
2177                 }
2178                 break;
2179         case DEV_STATE_STARTWAIT_TX:
2180                 if (event == DEV_EVENT_TXUP) {
2181                         fsm_newstate(fi, DEV_STATE_RUNNING);
2182                         dev_info(&dev->dev,
2183                                 "Connected with remote side\n");
2184                         ctcm_clear_busy(dev);
2185                 }
2186                 break;
2187         case DEV_STATE_STOPWAIT_TX:
2188                 if (event == DEV_EVENT_RXUP)
2189                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2190                 break;
2191         case DEV_STATE_STOPWAIT_RX:
2192                 if (event == DEV_EVENT_TXUP)
2193                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX);
2194                 break;
2195         }
2196
2197         if (IS_MPC(priv)) {
2198                 if (event == DEV_EVENT_RXUP)
2199                         mpc_channel_action(priv->channel[CTCM_READ],
2200                                 CTCM_READ, MPC_CHANNEL_ADD);
2201                 else
2202                         mpc_channel_action(priv->channel[CTCM_WRITE],
2203                                 CTCM_WRITE, MPC_CHANNEL_ADD);
2204         }
2205 }
2206
2207 /**
2208  * Called from device statemachine
2209  * when a channel has been shutdown.
2210  *
2211  * fi           An instance of an interface statemachine.
2212  * event        The event, just happened.
2213  * arg          Generic pointer, casted from struct net_device * upon call.
2214  */
2215 static void dev_action_chdown(fsm_instance *fi, int event, void *arg)
2216 {
2217
2218         struct net_device *dev = arg;
2219         struct ctcm_priv *priv = dev->ml_priv;
2220
2221         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
2222
2223         switch (fsm_getstate(fi)) {
2224         case DEV_STATE_RUNNING:
2225                 if (event == DEV_EVENT_TXDOWN)
2226                         fsm_newstate(fi, DEV_STATE_STARTWAIT_TX);
2227                 else
2228                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RX);
2229                 break;
2230         case DEV_STATE_STARTWAIT_RX:
2231                 if (event == DEV_EVENT_TXDOWN)
2232                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2233                 break;
2234         case DEV_STATE_STARTWAIT_TX:
2235                 if (event == DEV_EVENT_RXDOWN)
2236                         fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX);
2237                 break;
2238         case DEV_STATE_STOPWAIT_RXTX:
2239                 if (event == DEV_EVENT_TXDOWN)
2240                         fsm_newstate(fi, DEV_STATE_STOPWAIT_RX);
2241                 else
2242                         fsm_newstate(fi, DEV_STATE_STOPWAIT_TX);
2243                 break;
2244         case DEV_STATE_STOPWAIT_RX:
2245                 if (event == DEV_EVENT_RXDOWN)
2246                         fsm_newstate(fi, DEV_STATE_STOPPED);
2247                 break;
2248         case DEV_STATE_STOPWAIT_TX:
2249                 if (event == DEV_EVENT_TXDOWN)
2250                         fsm_newstate(fi, DEV_STATE_STOPPED);
2251                 break;
2252         }
2253         if (IS_MPC(priv)) {
2254                 if (event == DEV_EVENT_RXDOWN)
2255                         mpc_channel_action(priv->channel[CTCM_READ],
2256                                 CTCM_READ, MPC_CHANNEL_REMOVE);
2257                 else
2258                         mpc_channel_action(priv->channel[CTCM_WRITE],
2259                                 CTCM_WRITE, MPC_CHANNEL_REMOVE);
2260         }
2261 }
2262
2263 const fsm_node dev_fsm[] = {
2264         { DEV_STATE_STOPPED,        DEV_EVENT_START,   dev_action_start   },
2265         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_START,   dev_action_start   },
2266         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RXDOWN,  dev_action_chdown  },
2267         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_TXDOWN,  dev_action_chdown  },
2268         { DEV_STATE_STOPWAIT_RXTX,  DEV_EVENT_RESTART, dev_action_restart },
2269         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_START,   dev_action_start   },
2270         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXUP,    dev_action_chup    },
2271         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_TXUP,    dev_action_chup    },
2272         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RXDOWN,  dev_action_chdown  },
2273         { DEV_STATE_STOPWAIT_RX,    DEV_EVENT_RESTART, dev_action_restart },
2274         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_START,   dev_action_start   },
2275         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RXUP,    dev_action_chup    },
2276         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXUP,    dev_action_chup    },
2277         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_TXDOWN,  dev_action_chdown  },
2278         { DEV_STATE_STOPWAIT_TX,    DEV_EVENT_RESTART, dev_action_restart },
2279         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP,    dev_action_stop    },
2280         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP,    dev_action_chup    },
2281         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP,    dev_action_chup    },
2282         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN,  dev_action_chdown  },
2283         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN,  dev_action_chdown  },
2284         { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart },
2285         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_STOP,    dev_action_stop    },
2286         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXUP,    dev_action_chup    },
2287         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_TXUP,    dev_action_chup    },
2288         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RXDOWN,  dev_action_chdown  },
2289         { DEV_STATE_STARTWAIT_TX,   DEV_EVENT_RESTART, dev_action_restart },
2290         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_STOP,    dev_action_stop    },
2291         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RXUP,    dev_action_chup    },
2292         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXUP,    dev_action_chup    },
2293         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_TXDOWN,  dev_action_chdown  },
2294         { DEV_STATE_STARTWAIT_RX,   DEV_EVENT_RESTART, dev_action_restart },
2295         { DEV_STATE_RUNNING,        DEV_EVENT_STOP,    dev_action_stop    },
2296         { DEV_STATE_RUNNING,        DEV_EVENT_RXDOWN,  dev_action_chdown  },
2297         { DEV_STATE_RUNNING,        DEV_EVENT_TXDOWN,  dev_action_chdown  },
2298         { DEV_STATE_RUNNING,        DEV_EVENT_TXUP,    ctcm_action_nop    },
2299         { DEV_STATE_RUNNING,        DEV_EVENT_RXUP,    ctcm_action_nop    },
2300         { DEV_STATE_RUNNING,        DEV_EVENT_RESTART, dev_action_restart },
2301 };
2302
2303 int dev_fsm_len = ARRAY_SIZE(dev_fsm);
2304
2305 /* --- This is the END my friend --- */
2306