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