kernel/drivers/s390/net/ctcm_fsms.c

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