1 /* 2 * drivers/s390/net/ctcm_fsms.c 3 * 4 * Copyright IBM Corp. 2001, 2007 5 * Authors: Fritz Elfert (felfert@millenux.com) 6 * Peter Tiedemann (ptiedem@de.ibm.com) 7 * MPC additions : 8 * Belinda Thompson (belindat@us.ibm.com) 9 * Andy Richter (richtera@us.ibm.com) 10 */ 11 12 #undef DEBUG 13 #undef DEBUGDATA 14 #undef DEBUGCCW 15 16 #define KMSG_COMPONENT "ctcm" 17 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 18 19 #include <linux/module.h> 20 #include <linux/init.h> 21 #include <linux/kernel.h> 22 #include <linux/slab.h> 23 #include <linux/errno.h> 24 #include <linux/types.h> 25 #include <linux/interrupt.h> 26 #include <linux/timer.h> 27 #include <linux/bitops.h> 28 29 #include <linux/signal.h> 30 #include <linux/string.h> 31 32 #include <linux/ip.h> 33 #include <linux/if_arp.h> 34 #include <linux/tcp.h> 35 #include <linux/skbuff.h> 36 #include <linux/ctype.h> 37 #include <net/dst.h> 38 39 #include <linux/io.h> 40 #include <asm/ccwdev.h> 41 #include <asm/ccwgroup.h> 42 #include <linux/uaccess.h> 43 44 #include <asm/idals.h> 45 46 #include "fsm.h" 47 #include "cu3088.h" 48 49 #include "ctcm_dbug.h" 50 #include "ctcm_main.h" 51 #include "ctcm_fsms.h" 52 53 const char *dev_state_names[] = { 54 [DEV_STATE_STOPPED] = "Stopped", 55 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX", 56 [DEV_STATE_STARTWAIT_RX] = "StartWait RX", 57 [DEV_STATE_STARTWAIT_TX] = "StartWait TX", 58 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX", 59 [DEV_STATE_STOPWAIT_RX] = "StopWait RX", 60 [DEV_STATE_STOPWAIT_TX] = "StopWait TX", 61 [DEV_STATE_RUNNING] = "Running", 62 }; 63 64 const char *dev_event_names[] = { 65 [DEV_EVENT_START] = "Start", 66 [DEV_EVENT_STOP] = "Stop", 67 [DEV_EVENT_RXUP] = "RX up", 68 [DEV_EVENT_TXUP] = "TX up", 69 [DEV_EVENT_RXDOWN] = "RX down", 70 [DEV_EVENT_TXDOWN] = "TX down", 71 [DEV_EVENT_RESTART] = "Restart", 72 }; 73 74 const char *ctc_ch_event_names[] = { 75 [CTC_EVENT_IO_SUCCESS] = "ccw_device success", 76 [CTC_EVENT_IO_EBUSY] = "ccw_device busy", 77 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev", 78 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown", 79 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY", 80 [CTC_EVENT_ATTN] = "Status ATTN", 81 [CTC_EVENT_BUSY] = "Status BUSY", 82 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset", 83 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset", 84 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout", 85 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity", 86 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure", 87 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity", 88 [CTC_EVENT_UC_ZERO] = "Unit check ZERO", 89 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown", 90 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown", 91 [CTC_EVENT_MC_FAIL] = "Machine check failure", 92 [CTC_EVENT_MC_GOOD] = "Machine check operational", 93 [CTC_EVENT_IRQ] = "IRQ normal", 94 [CTC_EVENT_FINSTAT] = "IRQ final", 95 [CTC_EVENT_TIMER] = "Timer", 96 [CTC_EVENT_START] = "Start", 97 [CTC_EVENT_STOP] = "Stop", 98 /* 99 * additional MPC events 100 */ 101 [CTC_EVENT_SEND_XID] = "XID Exchange", 102 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer", 103 }; 104 105 const char *ctc_ch_state_names[] = { 106 [CTC_STATE_IDLE] = "Idle", 107 [CTC_STATE_STOPPED] = "Stopped", 108 [CTC_STATE_STARTWAIT] = "StartWait", 109 [CTC_STATE_STARTRETRY] = "StartRetry", 110 [CTC_STATE_SETUPWAIT] = "SetupWait", 111 [CTC_STATE_RXINIT] = "RX init", 112 [CTC_STATE_TXINIT] = "TX init", 113 [CTC_STATE_RX] = "RX", 114 [CTC_STATE_TX] = "TX", 115 [CTC_STATE_RXIDLE] = "RX idle", 116 [CTC_STATE_TXIDLE] = "TX idle", 117 [CTC_STATE_RXERR] = "RX error", 118 [CTC_STATE_TXERR] = "TX error", 119 [CTC_STATE_TERM] = "Terminating", 120 [CTC_STATE_DTERM] = "Restarting", 121 [CTC_STATE_NOTOP] = "Not operational", 122 /* 123 * additional MPC states 124 */ 125 [CH_XID0_PENDING] = "Pending XID0 Start", 126 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ", 127 [CH_XID7_PENDING] = "Pending XID7 P1 Start", 128 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ", 129 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ", 130 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ", 131 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ", 132 }; 133 134 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg); 135 136 /* 137 * ----- static ctcm actions for channel statemachine ----- 138 * 139 */ 140 static void chx_txdone(fsm_instance *fi, int event, void *arg); 141 static void chx_rx(fsm_instance *fi, int event, void *arg); 142 static void chx_rxidle(fsm_instance *fi, int event, void *arg); 143 static void chx_firstio(fsm_instance *fi, int event, void *arg); 144 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); 145 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); 146 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); 147 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); 148 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); 149 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); 150 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); 151 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); 152 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); 153 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); 154 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); 155 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); 156 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); 157 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); 158 159 /* 160 * ----- static ctcmpc actions for ctcmpc channel statemachine ----- 161 * 162 */ 163 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg); 164 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg); 165 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg); 166 /* shared : 167 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); 168 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); 169 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); 170 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); 171 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); 172 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); 173 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); 174 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); 175 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); 176 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); 177 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); 178 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); 179 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); 180 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); 181 */ 182 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg); 183 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *); 184 static void ctcmpc_chx_resend(fsm_instance *, int, void *); 185 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg); 186 187 /** 188 * Check return code of a preceeding ccw_device call, halt_IO etc... 189 * 190 * ch : The channel, the error belongs to. 191 * Returns the error code (!= 0) to inspect. 192 */ 193 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg) 194 { 195 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 196 "%s(%s): %s: %04x\n", 197 CTCM_FUNTAIL, ch->id, msg, rc); 198 switch (rc) { 199 case -EBUSY: 200 pr_info("%s: The communication peer is busy\n", 201 ch->id); 202 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch); 203 break; 204 case -ENODEV: 205 pr_err("%s: The specified target device is not valid\n", 206 ch->id); 207 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch); 208 break; 209 default: 210 pr_err("An I/O operation resulted in error %04x\n", 211 rc); 212 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch); 213 } 214 } 215 216 void ctcm_purge_skb_queue(struct sk_buff_head *q) 217 { 218 struct sk_buff *skb; 219 220 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__); 221 222 while ((skb = skb_dequeue(q))) { 223 atomic_dec(&skb->users); 224 dev_kfree_skb_any(skb); 225 } 226 } 227 228 /** 229 * NOP action for statemachines 230 */ 231 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg) 232 { 233 } 234 235 /* 236 * Actions for channel - statemachines. 237 */ 238 239 /** 240 * Normal data has been send. Free the corresponding 241 * skb (it's in io_queue), reset dev->tbusy and 242 * revert to idle state. 243 * 244 * fi An instance of a channel statemachine. 245 * event The event, just happened. 246 * arg Generic pointer, casted from channel * upon call. 247 */ 248 static void chx_txdone(fsm_instance *fi, int event, void *arg) 249 { 250 struct channel *ch = arg; 251 struct net_device *dev = ch->netdev; 252 struct ctcm_priv *priv = dev->ml_priv; 253 struct sk_buff *skb; 254 int first = 1; 255 int i; 256 unsigned long duration; 257 struct timespec done_stamp = current_kernel_time(); /* xtime */ 258 259 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 260 261 duration = 262 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 + 263 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000; 264 if (duration > ch->prof.tx_time) 265 ch->prof.tx_time = duration; 266 267 if (ch->irb->scsw.cmd.count != 0) 268 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 269 "%s(%s): TX not complete, remaining %d bytes", 270 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); 271 fsm_deltimer(&ch->timer); 272 while ((skb = skb_dequeue(&ch->io_queue))) { 273 priv->stats.tx_packets++; 274 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 275 if (first) { 276 priv->stats.tx_bytes += 2; 277 first = 0; 278 } 279 atomic_dec(&skb->users); 280 dev_kfree_skb_irq(skb); 281 } 282 spin_lock(&ch->collect_lock); 283 clear_normalized_cda(&ch->ccw[4]); 284 if (ch->collect_len > 0) { 285 int rc; 286 287 if (ctcm_checkalloc_buffer(ch)) { 288 spin_unlock(&ch->collect_lock); 289 return; 290 } 291 ch->trans_skb->data = ch->trans_skb_data; 292 skb_reset_tail_pointer(ch->trans_skb); 293 ch->trans_skb->len = 0; 294 if (ch->prof.maxmulti < (ch->collect_len + 2)) 295 ch->prof.maxmulti = ch->collect_len + 2; 296 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) 297 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); 298 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; 299 i = 0; 300 while ((skb = skb_dequeue(&ch->collect_queue))) { 301 skb_copy_from_linear_data(skb, 302 skb_put(ch->trans_skb, skb->len), skb->len); 303 priv->stats.tx_packets++; 304 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 305 atomic_dec(&skb->users); 306 dev_kfree_skb_irq(skb); 307 i++; 308 } 309 ch->collect_len = 0; 310 spin_unlock(&ch->collect_lock); 311 ch->ccw[1].count = ch->trans_skb->len; 312 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 313 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 314 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 315 (unsigned long)ch, 0xff, 0); 316 ch->prof.doios_multi++; 317 if (rc != 0) { 318 priv->stats.tx_dropped += i; 319 priv->stats.tx_errors += i; 320 fsm_deltimer(&ch->timer); 321 ctcm_ccw_check_rc(ch, rc, "chained TX"); 322 } 323 } else { 324 spin_unlock(&ch->collect_lock); 325 fsm_newstate(fi, CTC_STATE_TXIDLE); 326 } 327 ctcm_clear_busy_do(dev); 328 } 329 330 /** 331 * Initial data is sent. 332 * Notify device statemachine that we are up and 333 * running. 334 * 335 * fi An instance of a channel statemachine. 336 * event The event, just happened. 337 * arg Generic pointer, casted from channel * upon call. 338 */ 339 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) 340 { 341 struct channel *ch = arg; 342 struct net_device *dev = ch->netdev; 343 struct ctcm_priv *priv = dev->ml_priv; 344 345 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 346 347 fsm_deltimer(&ch->timer); 348 fsm_newstate(fi, CTC_STATE_TXIDLE); 349 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); 350 } 351 352 /** 353 * Got normal data, check for sanity, queue it up, allocate new buffer 354 * trigger bottom half, and initiate next read. 355 * 356 * fi An instance of a channel statemachine. 357 * event The event, just happened. 358 * arg Generic pointer, casted from channel * upon call. 359 */ 360 static void chx_rx(fsm_instance *fi, int event, void *arg) 361 { 362 struct channel *ch = arg; 363 struct net_device *dev = ch->netdev; 364 struct ctcm_priv *priv = dev->ml_priv; 365 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 366 struct sk_buff *skb = ch->trans_skb; 367 __u16 block_len = *((__u16 *)skb->data); 368 int check_len; 369 int rc; 370 371 fsm_deltimer(&ch->timer); 372 if (len < 8) { 373 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 374 "%s(%s): got packet with length %d < 8\n", 375 CTCM_FUNTAIL, dev->name, len); 376 priv->stats.rx_dropped++; 377 priv->stats.rx_length_errors++; 378 goto again; 379 } 380 if (len > ch->max_bufsize) { 381 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 382 "%s(%s): got packet with length %d > %d\n", 383 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); 384 priv->stats.rx_dropped++; 385 priv->stats.rx_length_errors++; 386 goto again; 387 } 388 389 /* 390 * VM TCP seems to have a bug sending 2 trailing bytes of garbage. 391 */ 392 switch (ch->protocol) { 393 case CTCM_PROTO_S390: 394 case CTCM_PROTO_OS390: 395 check_len = block_len + 2; 396 break; 397 default: 398 check_len = block_len; 399 break; 400 } 401 if ((len < block_len) || (len > check_len)) { 402 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 403 "%s(%s): got block length %d != rx length %d\n", 404 CTCM_FUNTAIL, dev->name, block_len, len); 405 if (do_debug) 406 ctcmpc_dump_skb(skb, 0); 407 408 *((__u16 *)skb->data) = len; 409 priv->stats.rx_dropped++; 410 priv->stats.rx_length_errors++; 411 goto again; 412 } 413 if (block_len > 2) { 414 *((__u16 *)skb->data) = block_len - 2; 415 ctcm_unpack_skb(ch, skb); 416 } 417 again: 418 skb->data = ch->trans_skb_data; 419 skb_reset_tail_pointer(skb); 420 skb->len = 0; 421 if (ctcm_checkalloc_buffer(ch)) 422 return; 423 ch->ccw[1].count = ch->max_bufsize; 424 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 425 (unsigned long)ch, 0xff, 0); 426 if (rc != 0) 427 ctcm_ccw_check_rc(ch, rc, "normal RX"); 428 } 429 430 /** 431 * Initialize connection by sending a __u16 of value 0. 432 * 433 * fi An instance of a channel statemachine. 434 * event The event, just happened. 435 * arg Generic pointer, casted from channel * upon call. 436 */ 437 static void chx_firstio(fsm_instance *fi, int event, void *arg) 438 { 439 int rc; 440 struct channel *ch = arg; 441 int fsmstate = fsm_getstate(fi); 442 443 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 444 "%s(%s) : %02x", 445 CTCM_FUNTAIL, ch->id, fsmstate); 446 447 ch->sense_rc = 0; /* reset unit check report control */ 448 if (fsmstate == CTC_STATE_TXIDLE) 449 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 450 "%s(%s): remote side issued READ?, init.\n", 451 CTCM_FUNTAIL, ch->id); 452 fsm_deltimer(&ch->timer); 453 if (ctcm_checkalloc_buffer(ch)) 454 return; 455 if ((fsmstate == CTC_STATE_SETUPWAIT) && 456 (ch->protocol == CTCM_PROTO_OS390)) { 457 /* OS/390 resp. z/OS */ 458 if (CHANNEL_DIRECTION(ch->flags) == READ) { 459 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 460 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, 461 CTC_EVENT_TIMER, ch); 462 chx_rxidle(fi, event, arg); 463 } else { 464 struct net_device *dev = ch->netdev; 465 struct ctcm_priv *priv = dev->ml_priv; 466 fsm_newstate(fi, CTC_STATE_TXIDLE); 467 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 468 } 469 return; 470 } 471 /* 472 * Don't setup a timer for receiving the initial RX frame 473 * if in compatibility mode, since VM TCP delays the initial 474 * frame until it has some data to send. 475 */ 476 if ((CHANNEL_DIRECTION(ch->flags) == WRITE) || 477 (ch->protocol != CTCM_PROTO_S390)) 478 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 479 480 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 481 ch->ccw[1].count = 2; /* Transfer only length */ 482 483 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ) 484 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 485 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 486 (unsigned long)ch, 0xff, 0); 487 if (rc != 0) { 488 fsm_deltimer(&ch->timer); 489 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 490 ctcm_ccw_check_rc(ch, rc, "init IO"); 491 } 492 /* 493 * If in compatibility mode since we don't setup a timer, we 494 * also signal RX channel up immediately. This enables us 495 * to send packets early which in turn usually triggers some 496 * reply from VM TCP which brings up the RX channel to it's 497 * final state. 498 */ 499 if ((CHANNEL_DIRECTION(ch->flags) == READ) && 500 (ch->protocol == CTCM_PROTO_S390)) { 501 struct net_device *dev = ch->netdev; 502 struct ctcm_priv *priv = dev->ml_priv; 503 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 504 } 505 } 506 507 /** 508 * Got initial data, check it. If OK, 509 * notify device statemachine that we are up and 510 * running. 511 * 512 * fi An instance of a channel statemachine. 513 * event The event, just happened. 514 * arg Generic pointer, casted from channel * upon call. 515 */ 516 static void chx_rxidle(fsm_instance *fi, int event, void *arg) 517 { 518 struct channel *ch = arg; 519 struct net_device *dev = ch->netdev; 520 struct ctcm_priv *priv = dev->ml_priv; 521 __u16 buflen; 522 int rc; 523 524 fsm_deltimer(&ch->timer); 525 buflen = *((__u16 *)ch->trans_skb->data); 526 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", 527 __func__, dev->name, buflen); 528 529 if (buflen >= CTCM_INITIAL_BLOCKLEN) { 530 if (ctcm_checkalloc_buffer(ch)) 531 return; 532 ch->ccw[1].count = ch->max_bufsize; 533 fsm_newstate(fi, CTC_STATE_RXIDLE); 534 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 535 (unsigned long)ch, 0xff, 0); 536 if (rc != 0) { 537 fsm_newstate(fi, CTC_STATE_RXINIT); 538 ctcm_ccw_check_rc(ch, rc, "initial RX"); 539 } else 540 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 541 } else { 542 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", 543 __func__, dev->name, 544 buflen, CTCM_INITIAL_BLOCKLEN); 545 chx_firstio(fi, event, arg); 546 } 547 } 548 549 /** 550 * Set channel into extended mode. 551 * 552 * fi An instance of a channel statemachine. 553 * event The event, just happened. 554 * arg Generic pointer, casted from channel * upon call. 555 */ 556 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) 557 { 558 struct channel *ch = arg; 559 int rc; 560 unsigned long saveflags = 0; 561 int timeout = CTCM_TIME_5_SEC; 562 563 fsm_deltimer(&ch->timer); 564 if (IS_MPC(ch)) { 565 timeout = 1500; 566 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n", 567 __func__, smp_processor_id(), ch, ch->id); 568 } 569 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch); 570 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 571 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2); 572 573 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 574 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 575 /* Such conditional locking is undeterministic in 576 * static view. => ignore sparse warnings here. */ 577 578 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 579 (unsigned long)ch, 0xff, 0); 580 if (event == CTC_EVENT_TIMER) /* see above comments */ 581 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 582 if (rc != 0) { 583 fsm_deltimer(&ch->timer); 584 fsm_newstate(fi, CTC_STATE_STARTWAIT); 585 ctcm_ccw_check_rc(ch, rc, "set Mode"); 586 } else 587 ch->retry = 0; 588 } 589 590 /** 591 * Setup channel. 592 * 593 * fi An instance of a channel statemachine. 594 * event The event, just happened. 595 * arg Generic pointer, casted from channel * upon call. 596 */ 597 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) 598 { 599 struct channel *ch = arg; 600 unsigned long saveflags; 601 int rc; 602 603 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", 604 CTCM_FUNTAIL, ch->id, 605 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); 606 607 if (ch->trans_skb != NULL) { 608 clear_normalized_cda(&ch->ccw[1]); 609 dev_kfree_skb(ch->trans_skb); 610 ch->trans_skb = NULL; 611 } 612 if (CHANNEL_DIRECTION(ch->flags) == READ) { 613 ch->ccw[1].cmd_code = CCW_CMD_READ; 614 ch->ccw[1].flags = CCW_FLAG_SLI; 615 ch->ccw[1].count = 0; 616 } else { 617 ch->ccw[1].cmd_code = CCW_CMD_WRITE; 618 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 619 ch->ccw[1].count = 0; 620 } 621 if (ctcm_checkalloc_buffer(ch)) { 622 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 623 "%s(%s): %s trans_skb alloc delayed " 624 "until first transfer", 625 CTCM_FUNTAIL, ch->id, 626 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); 627 } 628 ch->ccw[0].cmd_code = CCW_CMD_PREPARE; 629 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 630 ch->ccw[0].count = 0; 631 ch->ccw[0].cda = 0; 632 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ 633 ch->ccw[2].flags = CCW_FLAG_SLI; 634 ch->ccw[2].count = 0; 635 ch->ccw[2].cda = 0; 636 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); 637 ch->ccw[4].cda = 0; 638 ch->ccw[4].flags &= ~CCW_FLAG_IDA; 639 640 fsm_newstate(fi, CTC_STATE_STARTWAIT); 641 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 642 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 643 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 644 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 645 if (rc != 0) { 646 if (rc != -EBUSY) 647 fsm_deltimer(&ch->timer); 648 ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); 649 } 650 } 651 652 /** 653 * Shutdown a channel. 654 * 655 * fi An instance of a channel statemachine. 656 * event The event, just happened. 657 * arg Generic pointer, casted from channel * upon call. 658 */ 659 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) 660 { 661 struct channel *ch = arg; 662 unsigned long saveflags = 0; 663 int rc; 664 int oldstate; 665 666 fsm_deltimer(&ch->timer); 667 if (IS_MPC(ch)) 668 fsm_deltimer(&ch->sweep_timer); 669 670 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 671 672 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ 673 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 674 /* Such conditional locking is undeterministic in 675 * static view. => ignore sparse warnings here. */ 676 oldstate = fsm_getstate(fi); 677 fsm_newstate(fi, CTC_STATE_TERM); 678 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 679 680 if (event == CTC_EVENT_STOP) 681 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 682 /* see remark above about conditional locking */ 683 684 if (rc != 0 && rc != -EBUSY) { 685 fsm_deltimer(&ch->timer); 686 if (event != CTC_EVENT_STOP) { 687 fsm_newstate(fi, oldstate); 688 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 689 } 690 } 691 } 692 693 /** 694 * Cleanup helper for chx_fail and chx_stopped 695 * cleanup channels queue and notify interface statemachine. 696 * 697 * fi An instance of a channel statemachine. 698 * state The next state (depending on caller). 699 * ch The channel to operate on. 700 */ 701 static void ctcm_chx_cleanup(fsm_instance *fi, int state, 702 struct channel *ch) 703 { 704 struct net_device *dev = ch->netdev; 705 struct ctcm_priv *priv = dev->ml_priv; 706 707 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 708 "%s(%s): %s[%d]\n", 709 CTCM_FUNTAIL, dev->name, ch->id, state); 710 711 fsm_deltimer(&ch->timer); 712 if (IS_MPC(ch)) 713 fsm_deltimer(&ch->sweep_timer); 714 715 fsm_newstate(fi, state); 716 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { 717 clear_normalized_cda(&ch->ccw[1]); 718 dev_kfree_skb_any(ch->trans_skb); 719 ch->trans_skb = NULL; 720 } 721 722 ch->th_seg = 0x00; 723 ch->th_seq_num = 0x00; 724 if (CHANNEL_DIRECTION(ch->flags) == READ) { 725 skb_queue_purge(&ch->io_queue); 726 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 727 } else { 728 ctcm_purge_skb_queue(&ch->io_queue); 729 if (IS_MPC(ch)) 730 ctcm_purge_skb_queue(&ch->sweep_queue); 731 spin_lock(&ch->collect_lock); 732 ctcm_purge_skb_queue(&ch->collect_queue); 733 ch->collect_len = 0; 734 spin_unlock(&ch->collect_lock); 735 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 736 } 737 } 738 739 /** 740 * A channel has successfully been halted. 741 * Cleanup it's queue and notify interface statemachine. 742 * 743 * fi An instance of a channel statemachine. 744 * event The event, just happened. 745 * arg Generic pointer, casted from channel * upon call. 746 */ 747 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) 748 { 749 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); 750 } 751 752 /** 753 * A stop command from device statemachine arrived and we are in 754 * not operational mode. Set state to stopped. 755 * 756 * fi An instance of a channel statemachine. 757 * event The event, just happened. 758 * arg Generic pointer, casted from channel * upon call. 759 */ 760 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) 761 { 762 fsm_newstate(fi, CTC_STATE_STOPPED); 763 } 764 765 /** 766 * A machine check for no path, not operational status or gone device has 767 * happened. 768 * Cleanup queue and notify interface statemachine. 769 * 770 * fi An instance of a channel statemachine. 771 * event The event, just happened. 772 * arg Generic pointer, casted from channel * upon call. 773 */ 774 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) 775 { 776 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); 777 } 778 779 /** 780 * Handle error during setup of channel. 781 * 782 * fi An instance of a channel statemachine. 783 * event The event, just happened. 784 * arg Generic pointer, casted from channel * upon call. 785 */ 786 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) 787 { 788 struct channel *ch = arg; 789 struct net_device *dev = ch->netdev; 790 struct ctcm_priv *priv = dev->ml_priv; 791 792 /* 793 * Special case: Got UC_RCRESET on setmode. 794 * This means that remote side isn't setup. In this case 795 * simply retry after some 10 secs... 796 */ 797 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && 798 ((event == CTC_EVENT_UC_RCRESET) || 799 (event == CTC_EVENT_UC_RSRESET))) { 800 fsm_newstate(fi, CTC_STATE_STARTRETRY); 801 fsm_deltimer(&ch->timer); 802 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 803 if (!IS_MPC(ch) && (CHANNEL_DIRECTION(ch->flags) == READ)) { 804 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 805 if (rc != 0) 806 ctcm_ccw_check_rc(ch, rc, 807 "HaltIO in chx_setuperr"); 808 } 809 return; 810 } 811 812 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 813 "%s(%s) : %s error during %s channel setup state=%s\n", 814 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], 815 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX", 816 fsm_getstate_str(fi)); 817 818 if (CHANNEL_DIRECTION(ch->flags) == READ) { 819 fsm_newstate(fi, CTC_STATE_RXERR); 820 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 821 } else { 822 fsm_newstate(fi, CTC_STATE_TXERR); 823 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 824 } 825 } 826 827 /** 828 * Restart a channel after an error. 829 * 830 * fi An instance of a channel statemachine. 831 * event The event, just happened. 832 * arg Generic pointer, casted from channel * upon call. 833 */ 834 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) 835 { 836 struct channel *ch = arg; 837 struct net_device *dev = ch->netdev; 838 unsigned long saveflags = 0; 839 int oldstate; 840 int rc; 841 842 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 843 "%s: %s[%d] of %s\n", 844 CTCM_FUNTAIL, ch->id, event, dev->name); 845 846 fsm_deltimer(&ch->timer); 847 848 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 849 oldstate = fsm_getstate(fi); 850 fsm_newstate(fi, CTC_STATE_STARTWAIT); 851 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 852 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 853 /* Such conditional locking is a known problem for 854 * sparse because its undeterministic in static view. 855 * Warnings should be ignored here. */ 856 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 857 if (event == CTC_EVENT_TIMER) 858 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 859 if (rc != 0) { 860 if (rc != -EBUSY) { 861 fsm_deltimer(&ch->timer); 862 fsm_newstate(fi, oldstate); 863 } 864 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); 865 } 866 } 867 868 /** 869 * Handle error during RX initial handshake (exchange of 870 * 0-length block header) 871 * 872 * fi An instance of a channel statemachine. 873 * event The event, just happened. 874 * arg Generic pointer, casted from channel * upon call. 875 */ 876 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) 877 { 878 struct channel *ch = arg; 879 struct net_device *dev = ch->netdev; 880 struct ctcm_priv *priv = dev->ml_priv; 881 882 if (event == CTC_EVENT_TIMER) { 883 if (!IS_MPCDEV(dev)) 884 /* TODO : check if MPC deletes timer somewhere */ 885 fsm_deltimer(&ch->timer); 886 if (ch->retry++ < 3) 887 ctcm_chx_restart(fi, event, arg); 888 else { 889 fsm_newstate(fi, CTC_STATE_RXERR); 890 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 891 } 892 } else { 893 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 894 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 895 ctc_ch_event_names[event], fsm_getstate_str(fi)); 896 897 dev_warn(&dev->dev, 898 "Initialization failed with RX/TX init handshake " 899 "error %s\n", ctc_ch_event_names[event]); 900 } 901 } 902 903 /** 904 * Notify device statemachine if we gave up initialization 905 * of RX channel. 906 * 907 * fi An instance of a channel statemachine. 908 * event The event, just happened. 909 * arg Generic pointer, casted from channel * upon call. 910 */ 911 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) 912 { 913 struct channel *ch = arg; 914 struct net_device *dev = ch->netdev; 915 struct ctcm_priv *priv = dev->ml_priv; 916 917 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 918 "%s(%s): RX %s busy, init. fail", 919 CTCM_FUNTAIL, dev->name, ch->id); 920 fsm_newstate(fi, CTC_STATE_RXERR); 921 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 922 } 923 924 /** 925 * Handle RX Unit check remote reset (remote disconnected) 926 * 927 * fi An instance of a channel statemachine. 928 * event The event, just happened. 929 * arg Generic pointer, casted from channel * upon call. 930 */ 931 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) 932 { 933 struct channel *ch = arg; 934 struct channel *ch2; 935 struct net_device *dev = ch->netdev; 936 struct ctcm_priv *priv = dev->ml_priv; 937 938 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 939 "%s: %s: remote disconnect - re-init ...", 940 CTCM_FUNTAIL, dev->name); 941 fsm_deltimer(&ch->timer); 942 /* 943 * Notify device statemachine 944 */ 945 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 946 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 947 948 fsm_newstate(fi, CTC_STATE_DTERM); 949 ch2 = priv->channel[WRITE]; 950 fsm_newstate(ch2->fsm, CTC_STATE_DTERM); 951 952 ccw_device_halt(ch->cdev, (unsigned long)ch); 953 ccw_device_halt(ch2->cdev, (unsigned long)ch2); 954 } 955 956 /** 957 * Handle error during TX channel initialization. 958 * 959 * fi An instance of a channel statemachine. 960 * event The event, just happened. 961 * arg Generic pointer, casted from channel * upon call. 962 */ 963 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) 964 { 965 struct channel *ch = arg; 966 struct net_device *dev = ch->netdev; 967 struct ctcm_priv *priv = dev->ml_priv; 968 969 if (event == CTC_EVENT_TIMER) { 970 fsm_deltimer(&ch->timer); 971 if (ch->retry++ < 3) 972 ctcm_chx_restart(fi, event, arg); 973 else { 974 fsm_newstate(fi, CTC_STATE_TXERR); 975 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 976 } 977 } else { 978 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 979 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 980 ctc_ch_event_names[event], fsm_getstate_str(fi)); 981 982 dev_warn(&dev->dev, 983 "Initialization failed with RX/TX init handshake " 984 "error %s\n", ctc_ch_event_names[event]); 985 } 986 } 987 988 /** 989 * Handle TX timeout by retrying operation. 990 * 991 * fi An instance of a channel statemachine. 992 * event The event, just happened. 993 * arg Generic pointer, casted from channel * upon call. 994 */ 995 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) 996 { 997 struct channel *ch = arg; 998 struct net_device *dev = ch->netdev; 999 struct ctcm_priv *priv = dev->ml_priv; 1000 struct sk_buff *skb; 1001 1002 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", 1003 __func__, smp_processor_id(), ch, ch->id); 1004 1005 fsm_deltimer(&ch->timer); 1006 if (ch->retry++ > 3) { 1007 struct mpc_group *gptr = priv->mpcg; 1008 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1009 "%s: %s: retries exceeded", 1010 CTCM_FUNTAIL, ch->id); 1011 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1012 /* call restart if not MPC or if MPC and mpcg fsm is ready. 1013 use gptr as mpc indicator */ 1014 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) 1015 ctcm_chx_restart(fi, event, arg); 1016 goto done; 1017 } 1018 1019 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1020 "%s : %s: retry %d", 1021 CTCM_FUNTAIL, ch->id, ch->retry); 1022 skb = skb_peek(&ch->io_queue); 1023 if (skb) { 1024 int rc = 0; 1025 unsigned long saveflags = 0; 1026 clear_normalized_cda(&ch->ccw[4]); 1027 ch->ccw[4].count = skb->len; 1028 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 1029 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1030 "%s: %s: IDAL alloc failed", 1031 CTCM_FUNTAIL, ch->id); 1032 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1033 ctcm_chx_restart(fi, event, arg); 1034 goto done; 1035 } 1036 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 1037 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ 1038 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1039 /* Such conditional locking is a known problem for 1040 * sparse because its undeterministic in static view. 1041 * Warnings should be ignored here. */ 1042 if (do_debug_ccw) 1043 ctcmpc_dumpit((char *)&ch->ccw[3], 1044 sizeof(struct ccw1) * 3); 1045 1046 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 1047 (unsigned long)ch, 0xff, 0); 1048 if (event == CTC_EVENT_TIMER) 1049 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), 1050 saveflags); 1051 if (rc != 0) { 1052 fsm_deltimer(&ch->timer); 1053 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry"); 1054 ctcm_purge_skb_queue(&ch->io_queue); 1055 } 1056 } 1057 done: 1058 return; 1059 } 1060 1061 /** 1062 * Handle fatal errors during an I/O command. 1063 * 1064 * fi An instance of a channel statemachine. 1065 * event The event, just happened. 1066 * arg Generic pointer, casted from channel * upon call. 1067 */ 1068 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg) 1069 { 1070 struct channel *ch = arg; 1071 struct net_device *dev = ch->netdev; 1072 struct ctcm_priv *priv = dev->ml_priv; 1073 int rd = CHANNEL_DIRECTION(ch->flags); 1074 1075 fsm_deltimer(&ch->timer); 1076 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1077 "%s: %s: %s unrecoverable channel error", 1078 CTCM_FUNTAIL, ch->id, rd == READ ? "RX" : "TX"); 1079 1080 if (IS_MPC(ch)) { 1081 priv->stats.tx_dropped++; 1082 priv->stats.tx_errors++; 1083 } 1084 if (rd == READ) { 1085 fsm_newstate(fi, CTC_STATE_RXERR); 1086 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 1087 } else { 1088 fsm_newstate(fi, CTC_STATE_TXERR); 1089 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1090 } 1091 } 1092 1093 /* 1094 * The ctcm statemachine for a channel. 1095 */ 1096 const fsm_node ch_fsm[] = { 1097 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1098 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1099 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1100 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1101 1102 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1103 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1104 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1105 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1106 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1107 1108 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1109 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1110 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1111 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1112 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1113 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1114 1115 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1116 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1117 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1118 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1119 1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio }, 1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1126 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1127 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1128 1129 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1130 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1131 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle }, 1132 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1133 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1134 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1135 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1136 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1137 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio }, 1138 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1139 1140 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1141 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1142 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx }, 1143 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1144 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1145 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1146 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx }, 1147 1148 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1149 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 1150 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 1151 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 1152 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 1153 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 1154 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1155 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1156 1157 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1158 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1159 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio }, 1160 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1161 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1162 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1163 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1164 1165 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 1166 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 1167 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 1168 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1169 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1170 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1171 1172 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 1173 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 1174 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1175 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1176 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1177 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1178 1179 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 1180 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 1181 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone }, 1182 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry }, 1183 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry }, 1184 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 1185 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1186 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1187 1188 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1189 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1190 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1191 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1192 }; 1193 1194 int ch_fsm_len = ARRAY_SIZE(ch_fsm); 1195 1196 /* 1197 * MPC actions for mpc channel statemachine 1198 * handling of MPC protocol requires extra 1199 * statemachine and actions which are prefixed ctcmpc_ . 1200 * The ctc_ch_states and ctc_ch_state_names, 1201 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions 1202 * which are expanded by some elements. 1203 */ 1204 1205 /* 1206 * Actions for mpc channel statemachine. 1207 */ 1208 1209 /** 1210 * Normal data has been send. Free the corresponding 1211 * skb (it's in io_queue), reset dev->tbusy and 1212 * revert to idle state. 1213 * 1214 * fi An instance of a channel statemachine. 1215 * event The event, just happened. 1216 * arg Generic pointer, casted from channel * upon call. 1217 */ 1218 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg) 1219 { 1220 struct channel *ch = arg; 1221 struct net_device *dev = ch->netdev; 1222 struct ctcm_priv *priv = dev->ml_priv; 1223 struct mpc_group *grp = priv->mpcg; 1224 struct sk_buff *skb; 1225 int first = 1; 1226 int i; 1227 __u32 data_space; 1228 unsigned long duration; 1229 struct sk_buff *peekskb; 1230 int rc; 1231 struct th_header *header; 1232 struct pdu *p_header; 1233 struct timespec done_stamp = current_kernel_time(); /* xtime */ 1234 1235 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n", 1236 __func__, dev->name, smp_processor_id()); 1237 1238 duration = 1239 (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 + 1240 (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000; 1241 if (duration > ch->prof.tx_time) 1242 ch->prof.tx_time = duration; 1243 1244 if (ch->irb->scsw.cmd.count != 0) 1245 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1246 "%s(%s): TX not complete, remaining %d bytes", 1247 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); 1248 fsm_deltimer(&ch->timer); 1249 while ((skb = skb_dequeue(&ch->io_queue))) { 1250 priv->stats.tx_packets++; 1251 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 1252 if (first) { 1253 priv->stats.tx_bytes += 2; 1254 first = 0; 1255 } 1256 atomic_dec(&skb->users); 1257 dev_kfree_skb_irq(skb); 1258 } 1259 spin_lock(&ch->collect_lock); 1260 clear_normalized_cda(&ch->ccw[4]); 1261 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) { 1262 spin_unlock(&ch->collect_lock); 1263 fsm_newstate(fi, CTC_STATE_TXIDLE); 1264 goto done; 1265 } 1266 1267 if (ctcm_checkalloc_buffer(ch)) { 1268 spin_unlock(&ch->collect_lock); 1269 goto done; 1270 } 1271 ch->trans_skb->data = ch->trans_skb_data; 1272 skb_reset_tail_pointer(ch->trans_skb); 1273 ch->trans_skb->len = 0; 1274 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH)) 1275 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH; 1276 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) 1277 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); 1278 i = 0; 1279 p_header = NULL; 1280 data_space = grp->group_max_buflen - TH_HEADER_LENGTH; 1281 1282 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q" 1283 " data_space:%04x\n", 1284 __func__, data_space); 1285 1286 while ((skb = skb_dequeue(&ch->collect_queue))) { 1287 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); 1288 p_header = (struct pdu *) 1289 (skb_tail_pointer(ch->trans_skb) - skb->len); 1290 p_header->pdu_flag = 0x00; 1291 if (skb->protocol == ntohs(ETH_P_SNAP)) 1292 p_header->pdu_flag |= 0x60; 1293 else 1294 p_header->pdu_flag |= 0x20; 1295 1296 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1297 __func__, ch->trans_skb->len); 1298 CTCM_PR_DBGDATA("%s: pdu header and data for up" 1299 " to 32 bytes sent to vtam\n", __func__); 1300 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32)); 1301 1302 ch->collect_len -= skb->len; 1303 data_space -= skb->len; 1304 priv->stats.tx_packets++; 1305 priv->stats.tx_bytes += skb->len; 1306 atomic_dec(&skb->users); 1307 dev_kfree_skb_any(skb); 1308 peekskb = skb_peek(&ch->collect_queue); 1309 if (peekskb->len > data_space) 1310 break; 1311 i++; 1312 } 1313 /* p_header points to the last one we handled */ 1314 if (p_header) 1315 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/ 1316 header = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1317 if (!header) { 1318 spin_unlock(&ch->collect_lock); 1319 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1320 goto done; 1321 } 1322 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 1323 ch->th_seq_num++; 1324 header->th_seq_num = ch->th_seq_num; 1325 1326 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , 1327 __func__, ch->th_seq_num); 1328 1329 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header, 1330 TH_HEADER_LENGTH); /* put the TH on the packet */ 1331 1332 kfree(header); 1333 1334 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1335 __func__, ch->trans_skb->len); 1336 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " 1337 "data to vtam from collect_q\n", __func__); 1338 CTCM_D3_DUMP((char *)ch->trans_skb->data, 1339 min_t(int, ch->trans_skb->len, 50)); 1340 1341 spin_unlock(&ch->collect_lock); 1342 clear_normalized_cda(&ch->ccw[1]); 1343 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 1344 dev_kfree_skb_any(ch->trans_skb); 1345 ch->trans_skb = NULL; 1346 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 1347 "%s: %s: IDAL alloc failed", 1348 CTCM_FUNTAIL, ch->id); 1349 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1350 return; 1351 } 1352 ch->ccw[1].count = ch->trans_skb->len; 1353 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 1354 ch->prof.send_stamp = current_kernel_time(); /* xtime */ 1355 if (do_debug_ccw) 1356 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1357 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 1358 (unsigned long)ch, 0xff, 0); 1359 ch->prof.doios_multi++; 1360 if (rc != 0) { 1361 priv->stats.tx_dropped += i; 1362 priv->stats.tx_errors += i; 1363 fsm_deltimer(&ch->timer); 1364 ctcm_ccw_check_rc(ch, rc, "chained TX"); 1365 } 1366 done: 1367 ctcm_clear_busy(dev); 1368 return; 1369 } 1370 1371 /** 1372 * Got normal data, check for sanity, queue it up, allocate new buffer 1373 * trigger bottom half, and initiate next read. 1374 * 1375 * fi An instance of a channel statemachine. 1376 * event The event, just happened. 1377 * arg Generic pointer, casted from channel * upon call. 1378 */ 1379 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg) 1380 { 1381 struct channel *ch = arg; 1382 struct net_device *dev = ch->netdev; 1383 struct ctcm_priv *priv = dev->ml_priv; 1384 struct mpc_group *grp = priv->mpcg; 1385 struct sk_buff *skb = ch->trans_skb; 1386 struct sk_buff *new_skb; 1387 unsigned long saveflags = 0; /* avoids compiler warning */ 1388 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 1389 1390 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n", 1391 CTCM_FUNTAIL, dev->name, smp_processor_id(), 1392 ch->id, ch->max_bufsize, len); 1393 fsm_deltimer(&ch->timer); 1394 1395 if (skb == NULL) { 1396 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1397 "%s(%s): TRANS_SKB = NULL", 1398 CTCM_FUNTAIL, dev->name); 1399 goto again; 1400 } 1401 1402 if (len < TH_HEADER_LENGTH) { 1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1404 "%s(%s): packet length %d to short", 1405 CTCM_FUNTAIL, dev->name, len); 1406 priv->stats.rx_dropped++; 1407 priv->stats.rx_length_errors++; 1408 } else { 1409 /* must have valid th header or game over */ 1410 __u32 block_len = len; 1411 len = TH_HEADER_LENGTH + XID2_LENGTH + 4; 1412 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC); 1413 1414 if (new_skb == NULL) { 1415 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1416 "%s(%d): skb allocation failed", 1417 CTCM_FUNTAIL, dev->name); 1418 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1419 goto again; 1420 } 1421 switch (fsm_getstate(grp->fsm)) { 1422 case MPCG_STATE_RESET: 1423 case MPCG_STATE_INOP: 1424 dev_kfree_skb_any(new_skb); 1425 break; 1426 case MPCG_STATE_FLOWC: 1427 case MPCG_STATE_READY: 1428 memcpy(skb_put(new_skb, block_len), 1429 skb->data, block_len); 1430 skb_queue_tail(&ch->io_queue, new_skb); 1431 tasklet_schedule(&ch->ch_tasklet); 1432 break; 1433 default: 1434 memcpy(skb_put(new_skb, len), skb->data, len); 1435 skb_queue_tail(&ch->io_queue, new_skb); 1436 tasklet_hi_schedule(&ch->ch_tasklet); 1437 break; 1438 } 1439 } 1440 1441 again: 1442 switch (fsm_getstate(grp->fsm)) { 1443 int rc, dolock; 1444 case MPCG_STATE_FLOWC: 1445 case MPCG_STATE_READY: 1446 if (ctcm_checkalloc_buffer(ch)) 1447 break; 1448 ch->trans_skb->data = ch->trans_skb_data; 1449 skb_reset_tail_pointer(ch->trans_skb); 1450 ch->trans_skb->len = 0; 1451 ch->ccw[1].count = ch->max_bufsize; 1452 if (do_debug_ccw) 1453 ctcmpc_dumpit((char *)&ch->ccw[0], 1454 sizeof(struct ccw1) * 3); 1455 dolock = !in_irq(); 1456 if (dolock) 1457 spin_lock_irqsave( 1458 get_ccwdev_lock(ch->cdev), saveflags); 1459 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 1460 (unsigned long)ch, 0xff, 0); 1461 if (dolock) /* see remark about conditional locking */ 1462 spin_unlock_irqrestore( 1463 get_ccwdev_lock(ch->cdev), saveflags); 1464 if (rc != 0) 1465 ctcm_ccw_check_rc(ch, rc, "normal RX"); 1466 default: 1467 break; 1468 } 1469 1470 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n", 1471 __func__, dev->name, ch, ch->id); 1472 1473 } 1474 1475 /** 1476 * Initialize connection by sending a __u16 of value 0. 1477 * 1478 * fi An instance of a channel statemachine. 1479 * event The event, just happened. 1480 * arg Generic pointer, casted from channel * upon call. 1481 */ 1482 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg) 1483 { 1484 struct channel *ch = arg; 1485 struct net_device *dev = ch->netdev; 1486 struct ctcm_priv *priv = dev->ml_priv; 1487 struct mpc_group *gptr = priv->mpcg; 1488 1489 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n", 1490 __func__, ch->id, ch); 1491 1492 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1493 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n", 1494 CTCM_FUNTAIL, ch->id, fsm_getstate(fi), 1495 fsm_getstate(gptr->fsm), ch->protocol); 1496 1497 if (fsm_getstate(fi) == CTC_STATE_TXIDLE) 1498 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? "); 1499 1500 fsm_deltimer(&ch->timer); 1501 if (ctcm_checkalloc_buffer(ch)) 1502 goto done; 1503 1504 switch (fsm_getstate(fi)) { 1505 case CTC_STATE_STARTRETRY: 1506 case CTC_STATE_SETUPWAIT: 1507 if (CHANNEL_DIRECTION(ch->flags) == READ) { 1508 ctcmpc_chx_rxidle(fi, event, arg); 1509 } else { 1510 fsm_newstate(fi, CTC_STATE_TXIDLE); 1511 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 1512 } 1513 goto done; 1514 default: 1515 break; 1516 }; 1517 1518 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ) 1519 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 1520 1521 done: 1522 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n", 1523 __func__, ch->id, ch); 1524 return; 1525 } 1526 1527 /** 1528 * Got initial data, check it. If OK, 1529 * notify device statemachine that we are up and 1530 * running. 1531 * 1532 * fi An instance of a channel statemachine. 1533 * event The event, just happened. 1534 * arg Generic pointer, casted from channel * upon call. 1535 */ 1536 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg) 1537 { 1538 struct channel *ch = arg; 1539 struct net_device *dev = ch->netdev; 1540 struct ctcm_priv *priv = dev->ml_priv; 1541 struct mpc_group *grp = priv->mpcg; 1542 int rc; 1543 unsigned long saveflags = 0; /* avoids compiler warning */ 1544 1545 fsm_deltimer(&ch->timer); 1546 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n", 1547 __func__, ch->id, dev->name, smp_processor_id(), 1548 fsm_getstate(fi), fsm_getstate(grp->fsm)); 1549 1550 fsm_newstate(fi, CTC_STATE_RXIDLE); 1551 /* XID processing complete */ 1552 1553 switch (fsm_getstate(grp->fsm)) { 1554 case MPCG_STATE_FLOWC: 1555 case MPCG_STATE_READY: 1556 if (ctcm_checkalloc_buffer(ch)) 1557 goto done; 1558 ch->trans_skb->data = ch->trans_skb_data; 1559 skb_reset_tail_pointer(ch->trans_skb); 1560 ch->trans_skb->len = 0; 1561 ch->ccw[1].count = ch->max_bufsize; 1562 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1563 if (event == CTC_EVENT_START) 1564 /* see remark about conditional locking */ 1565 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1566 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 1567 (unsigned long)ch, 0xff, 0); 1568 if (event == CTC_EVENT_START) 1569 spin_unlock_irqrestore( 1570 get_ccwdev_lock(ch->cdev), saveflags); 1571 if (rc != 0) { 1572 fsm_newstate(fi, CTC_STATE_RXINIT); 1573 ctcm_ccw_check_rc(ch, rc, "initial RX"); 1574 goto done; 1575 } 1576 break; 1577 default: 1578 break; 1579 } 1580 1581 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 1582 done: 1583 return; 1584 } 1585 1586 /* 1587 * ctcmpc channel FSM action 1588 * called from several points in ctcmpc_ch_fsm 1589 * ctcmpc only 1590 */ 1591 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg) 1592 { 1593 struct channel *ch = arg; 1594 struct net_device *dev = ch->netdev; 1595 struct ctcm_priv *priv = dev->ml_priv; 1596 struct mpc_group *grp = priv->mpcg; 1597 1598 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n", 1599 __func__, dev->name, ch->id, ch, smp_processor_id(), 1600 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1601 1602 switch (fsm_getstate(grp->fsm)) { 1603 case MPCG_STATE_XID2INITW: 1604 /* ok..start yside xid exchanges */ 1605 if (!ch->in_mpcgroup) 1606 break; 1607 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) { 1608 fsm_deltimer(&grp->timer); 1609 fsm_addtimer(&grp->timer, 1610 MPC_XID_TIMEOUT_VALUE, 1611 MPCG_EVENT_TIMER, dev); 1612 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1613 1614 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1615 /* attn rcvd before xid0 processed via bh */ 1616 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1617 break; 1618 case MPCG_STATE_XID2INITX: 1619 case MPCG_STATE_XID0IOWAIT: 1620 case MPCG_STATE_XID0IOWAIX: 1621 /* attn rcvd before xid0 processed on ch 1622 but mid-xid0 processing for group */ 1623 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1624 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1625 break; 1626 case MPCG_STATE_XID7INITW: 1627 case MPCG_STATE_XID7INITX: 1628 case MPCG_STATE_XID7INITI: 1629 case MPCG_STATE_XID7INITZ: 1630 switch (fsm_getstate(ch->fsm)) { 1631 case CH_XID7_PENDING: 1632 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1633 break; 1634 case CH_XID7_PENDING2: 1635 fsm_newstate(ch->fsm, CH_XID7_PENDING3); 1636 break; 1637 } 1638 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 1639 break; 1640 } 1641 1642 return; 1643 } 1644 1645 /* 1646 * ctcmpc channel FSM action 1647 * called from one point in ctcmpc_ch_fsm 1648 * ctcmpc only 1649 */ 1650 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg) 1651 { 1652 struct channel *ch = arg; 1653 struct net_device *dev = ch->netdev; 1654 struct ctcm_priv *priv = dev->ml_priv; 1655 struct mpc_group *grp = priv->mpcg; 1656 1657 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n", 1658 __func__, dev->name, ch->id, 1659 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1660 1661 fsm_deltimer(&ch->timer); 1662 1663 switch (fsm_getstate(grp->fsm)) { 1664 case MPCG_STATE_XID0IOWAIT: 1665 /* vtam wants to be primary.start yside xid exchanges*/ 1666 /* only receive one attn-busy at a time so must not */ 1667 /* change state each time */ 1668 grp->changed_side = 1; 1669 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1670 break; 1671 case MPCG_STATE_XID2INITW: 1672 if (grp->changed_side == 1) { 1673 grp->changed_side = 2; 1674 break; 1675 } 1676 /* process began via call to establish_conn */ 1677 /* so must report failure instead of reverting */ 1678 /* back to ready-for-xid passive state */ 1679 if (grp->estconnfunc) 1680 goto done; 1681 /* this attnbusy is NOT the result of xside xid */ 1682 /* collisions so yside must have been triggered */ 1683 /* by an ATTN that was not intended to start XID */ 1684 /* processing. Revert back to ready-for-xid and */ 1685 /* wait for ATTN interrupt to signal xid start */ 1686 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) { 1687 fsm_newstate(ch->fsm, CH_XID0_PENDING) ; 1688 fsm_deltimer(&grp->timer); 1689 goto done; 1690 } 1691 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1692 goto done; 1693 case MPCG_STATE_XID2INITX: 1694 /* XID2 was received before ATTN Busy for second 1695 channel.Send yside xid for second channel. 1696 */ 1697 if (grp->changed_side == 1) { 1698 grp->changed_side = 2; 1699 break; 1700 } 1701 case MPCG_STATE_XID0IOWAIX: 1702 case MPCG_STATE_XID7INITW: 1703 case MPCG_STATE_XID7INITX: 1704 case MPCG_STATE_XID7INITI: 1705 case MPCG_STATE_XID7INITZ: 1706 default: 1707 /* multiple attn-busy indicates too out-of-sync */ 1708 /* and they are certainly not being received as part */ 1709 /* of valid mpc group negotiations.. */ 1710 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1711 goto done; 1712 } 1713 1714 if (grp->changed_side == 1) { 1715 fsm_deltimer(&grp->timer); 1716 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 1717 MPCG_EVENT_TIMER, dev); 1718 } 1719 if (ch->in_mpcgroup) 1720 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1721 else 1722 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1723 "%s(%s): channel %s not added to group", 1724 CTCM_FUNTAIL, dev->name, ch->id); 1725 1726 done: 1727 return; 1728 } 1729 1730 /* 1731 * ctcmpc channel FSM action 1732 * called from several points in ctcmpc_ch_fsm 1733 * ctcmpc only 1734 */ 1735 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg) 1736 { 1737 struct channel *ch = arg; 1738 struct net_device *dev = ch->netdev; 1739 struct ctcm_priv *priv = dev->ml_priv; 1740 struct mpc_group *grp = priv->mpcg; 1741 1742 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1743 return; 1744 } 1745 1746 /* 1747 * ctcmpc channel FSM action 1748 * called from several points in ctcmpc_ch_fsm 1749 * ctcmpc only 1750 */ 1751 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg) 1752 { 1753 struct channel *ach = arg; 1754 struct net_device *dev = ach->netdev; 1755 struct ctcm_priv *priv = dev->ml_priv; 1756 struct mpc_group *grp = priv->mpcg; 1757 struct channel *wch = priv->channel[WRITE]; 1758 struct channel *rch = priv->channel[READ]; 1759 struct sk_buff *skb; 1760 struct th_sweep *header; 1761 int rc = 0; 1762 unsigned long saveflags = 0; 1763 1764 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n", 1765 __func__, smp_processor_id(), ach, ach->id); 1766 1767 if (grp->in_sweep == 0) 1768 goto done; 1769 1770 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" , 1771 __func__, wch->th_seq_num); 1772 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" , 1773 __func__, rch->th_seq_num); 1774 1775 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) { 1776 /* give the previous IO time to complete */ 1777 fsm_addtimer(&wch->sweep_timer, 1778 200, CTC_EVENT_RSWEEP_TIMER, wch); 1779 goto done; 1780 } 1781 1782 skb = skb_dequeue(&wch->sweep_queue); 1783 if (!skb) 1784 goto done; 1785 1786 if (set_normalized_cda(&wch->ccw[4], skb->data)) { 1787 grp->in_sweep = 0; 1788 ctcm_clear_busy_do(dev); 1789 dev_kfree_skb_any(skb); 1790 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1791 goto done; 1792 } else { 1793 atomic_inc(&skb->users); 1794 skb_queue_tail(&wch->io_queue, skb); 1795 } 1796 1797 /* send out the sweep */ 1798 wch->ccw[4].count = skb->len; 1799 1800 header = (struct th_sweep *)skb->data; 1801 switch (header->th.th_ch_flag) { 1802 case TH_SWEEP_REQ: 1803 grp->sweep_req_pend_num--; 1804 break; 1805 case TH_SWEEP_RESP: 1806 grp->sweep_rsp_pend_num--; 1807 break; 1808 } 1809 1810 header->sw.th_last_seq = wch->th_seq_num; 1811 1812 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3); 1813 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__); 1814 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH); 1815 1816 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch); 1817 fsm_newstate(wch->fsm, CTC_STATE_TX); 1818 1819 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags); 1820 wch->prof.send_stamp = current_kernel_time(); /* xtime */ 1821 rc = ccw_device_start(wch->cdev, &wch->ccw[3], 1822 (unsigned long) wch, 0xff, 0); 1823 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags); 1824 1825 if ((grp->sweep_req_pend_num == 0) && 1826 (grp->sweep_rsp_pend_num == 0)) { 1827 grp->in_sweep = 0; 1828 rch->th_seq_num = 0x00; 1829 wch->th_seq_num = 0x00; 1830 ctcm_clear_busy_do(dev); 1831 } 1832 1833 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" , 1834 __func__, wch->th_seq_num, rch->th_seq_num); 1835 1836 if (rc != 0) 1837 ctcm_ccw_check_rc(wch, rc, "send sweep"); 1838 1839 done: 1840 return; 1841 } 1842 1843 1844 /* 1845 * The ctcmpc statemachine for a channel. 1846 */ 1847 1848 const fsm_node ctcmpc_ch_fsm[] = { 1849 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1850 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1851 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1852 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1853 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1854 1855 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1856 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1857 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1858 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1859 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1860 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop }, 1861 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop }, 1862 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1863 1864 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1865 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1866 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1867 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1868 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1869 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1870 1871 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1872 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1873 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1874 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1875 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1876 1877 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1878 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1879 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 1880 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1881 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1882 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1885 1886 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1887 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1888 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle }, 1889 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1890 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1891 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1892 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1893 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1894 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio }, 1895 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1896 1897 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1898 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1899 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1900 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1901 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1902 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1903 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1904 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1905 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1906 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1907 1908 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1909 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1910 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio }, 1911 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop }, 1912 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1913 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1914 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1915 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1916 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy }, 1917 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1918 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1919 1920 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1921 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1922 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1923 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1924 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1925 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1926 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1927 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1928 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1929 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1930 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1931 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1932 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1933 1934 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1935 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1936 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio }, 1937 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop }, 1938 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1939 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1940 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1941 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1942 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1943 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1944 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1945 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1946 1947 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1948 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1949 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio }, 1950 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop }, 1951 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1952 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1953 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1954 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1955 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1956 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1957 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1958 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1959 1960 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1961 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1962 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio }, 1963 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop }, 1964 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1965 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1966 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1967 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1968 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1969 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1970 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1971 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1972 1973 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1974 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1975 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio }, 1976 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop }, 1977 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1978 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1979 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1980 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1981 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1982 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1983 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1984 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1985 1986 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1987 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1988 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1989 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1990 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 1991 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1992 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1993 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1994 1995 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1996 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 1997 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 1998 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 1999 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 2000 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 2001 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2002 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2003 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2004 2005 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 2006 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 2007 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 2008 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2009 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2010 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2011 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2012 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2013 2014 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 2015 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 2016 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 2017 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2018 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2019 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2020 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2021 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2022 2023 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 2024 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 2025 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 2026 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2027 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2028 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2029 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2030 2031 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 2032 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 2033 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone }, 2034 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2035 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2036 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 2037 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2038 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2039 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2040 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2041 2042 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2043 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2044 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2045 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2046 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2047 }; 2048 2049 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm); 2050 2051 /* 2052 * Actions for interface - statemachine. 2053 */ 2054 2055 /** 2056 * Startup channels by sending CTC_EVENT_START to each channel. 2057 * 2058 * fi An instance of an interface statemachine. 2059 * event The event, just happened. 2060 * arg Generic pointer, casted from struct net_device * upon call. 2061 */ 2062 static void dev_action_start(fsm_instance *fi, int event, void *arg) 2063 { 2064 struct net_device *dev = arg; 2065 struct ctcm_priv *priv = dev->ml_priv; 2066 int direction; 2067 2068 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2069 2070 fsm_deltimer(&priv->restart_timer); 2071 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2072 if (IS_MPC(priv)) 2073 priv->mpcg->channels_terminating = 0; 2074 for (direction = READ; direction <= WRITE; direction++) { 2075 struct channel *ch = priv->channel[direction]; 2076 fsm_event(ch->fsm, CTC_EVENT_START, ch); 2077 } 2078 } 2079 2080 /** 2081 * Shutdown channels by sending CTC_EVENT_STOP to each channel. 2082 * 2083 * fi An instance of an interface statemachine. 2084 * event The event, just happened. 2085 * arg Generic pointer, casted from struct net_device * upon call. 2086 */ 2087 static void dev_action_stop(fsm_instance *fi, int event, void *arg) 2088 { 2089 int direction; 2090 struct net_device *dev = arg; 2091 struct ctcm_priv *priv = dev->ml_priv; 2092 2093 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2094 2095 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2096 for (direction = READ; direction <= WRITE; direction++) { 2097 struct channel *ch = priv->channel[direction]; 2098 fsm_event(ch->fsm, CTC_EVENT_STOP, ch); 2099 ch->th_seq_num = 0x00; 2100 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n", 2101 __func__, ch->th_seq_num); 2102 } 2103 if (IS_MPC(priv)) 2104 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2105 } 2106 2107 static void dev_action_restart(fsm_instance *fi, int event, void *arg) 2108 { 2109 int restart_timer; 2110 struct net_device *dev = arg; 2111 struct ctcm_priv *priv = dev->ml_priv; 2112 2113 CTCMY_DBF_DEV_NAME(TRACE, dev, ""); 2114 2115 if (IS_MPC(priv)) { 2116 restart_timer = CTCM_TIME_1_SEC; 2117 } else { 2118 restart_timer = CTCM_TIME_5_SEC; 2119 } 2120 dev_info(&dev->dev, "Restarting device\n"); 2121 2122 dev_action_stop(fi, event, arg); 2123 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 2124 if (IS_MPC(priv)) 2125 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2126 2127 /* going back into start sequence too quickly can */ 2128 /* result in the other side becoming unreachable due */ 2129 /* to sense reported when IO is aborted */ 2130 fsm_addtimer(&priv->restart_timer, restart_timer, 2131 DEV_EVENT_START, dev); 2132 } 2133 2134 /** 2135 * Called from channel statemachine 2136 * when a channel is up and running. 2137 * 2138 * fi An instance of an interface statemachine. 2139 * event The event, just happened. 2140 * arg Generic pointer, casted from struct net_device * upon call. 2141 */ 2142 static void dev_action_chup(fsm_instance *fi, int event, void *arg) 2143 { 2144 struct net_device *dev = arg; 2145 struct ctcm_priv *priv = dev->ml_priv; 2146 int dev_stat = fsm_getstate(fi); 2147 2148 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 2149 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL, 2150 dev->name, dev->ml_priv, dev_stat, event); 2151 2152 switch (fsm_getstate(fi)) { 2153 case DEV_STATE_STARTWAIT_RXTX: 2154 if (event == DEV_EVENT_RXUP) 2155 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2156 else 2157 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2158 break; 2159 case DEV_STATE_STARTWAIT_RX: 2160 if (event == DEV_EVENT_RXUP) { 2161 fsm_newstate(fi, DEV_STATE_RUNNING); 2162 dev_info(&dev->dev, 2163 "Connected with remote side\n"); 2164 ctcm_clear_busy(dev); 2165 } 2166 break; 2167 case DEV_STATE_STARTWAIT_TX: 2168 if (event == DEV_EVENT_TXUP) { 2169 fsm_newstate(fi, DEV_STATE_RUNNING); 2170 dev_info(&dev->dev, 2171 "Connected with remote side\n"); 2172 ctcm_clear_busy(dev); 2173 } 2174 break; 2175 case DEV_STATE_STOPWAIT_TX: 2176 if (event == DEV_EVENT_RXUP) 2177 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2178 break; 2179 case DEV_STATE_STOPWAIT_RX: 2180 if (event == DEV_EVENT_TXUP) 2181 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2182 break; 2183 } 2184 2185 if (IS_MPC(priv)) { 2186 if (event == DEV_EVENT_RXUP) 2187 mpc_channel_action(priv->channel[READ], 2188 READ, MPC_CHANNEL_ADD); 2189 else 2190 mpc_channel_action(priv->channel[WRITE], 2191 WRITE, MPC_CHANNEL_ADD); 2192 } 2193 } 2194 2195 /** 2196 * Called from device statemachine 2197 * when a channel has been shutdown. 2198 * 2199 * fi An instance of an interface statemachine. 2200 * event The event, just happened. 2201 * arg Generic pointer, casted from struct net_device * upon call. 2202 */ 2203 static void dev_action_chdown(fsm_instance *fi, int event, void *arg) 2204 { 2205 2206 struct net_device *dev = arg; 2207 struct ctcm_priv *priv = dev->ml_priv; 2208 2209 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2210 2211 switch (fsm_getstate(fi)) { 2212 case DEV_STATE_RUNNING: 2213 if (event == DEV_EVENT_TXDOWN) 2214 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2215 else 2216 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2217 break; 2218 case DEV_STATE_STARTWAIT_RX: 2219 if (event == DEV_EVENT_TXDOWN) 2220 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2221 break; 2222 case DEV_STATE_STARTWAIT_TX: 2223 if (event == DEV_EVENT_RXDOWN) 2224 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2225 break; 2226 case DEV_STATE_STOPWAIT_RXTX: 2227 if (event == DEV_EVENT_TXDOWN) 2228 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); 2229 else 2230 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); 2231 break; 2232 case DEV_STATE_STOPWAIT_RX: 2233 if (event == DEV_EVENT_RXDOWN) 2234 fsm_newstate(fi, DEV_STATE_STOPPED); 2235 break; 2236 case DEV_STATE_STOPWAIT_TX: 2237 if (event == DEV_EVENT_TXDOWN) 2238 fsm_newstate(fi, DEV_STATE_STOPPED); 2239 break; 2240 } 2241 if (IS_MPC(priv)) { 2242 if (event == DEV_EVENT_RXDOWN) 2243 mpc_channel_action(priv->channel[READ], 2244 READ, MPC_CHANNEL_REMOVE); 2245 else 2246 mpc_channel_action(priv->channel[WRITE], 2247 WRITE, MPC_CHANNEL_REMOVE); 2248 } 2249 } 2250 2251 const fsm_node dev_fsm[] = { 2252 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, 2253 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, 2254 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2255 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2256 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2257 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, 2258 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2259 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2260 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2261 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2262 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, 2263 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2264 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2265 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2266 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2267 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, 2268 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, 2269 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, 2270 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2271 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2272 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2273 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, 2274 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2275 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2276 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2277 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2278 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, 2279 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2280 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2281 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2282 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2283 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, 2284 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, 2285 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, 2286 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop }, 2287 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop }, 2288 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, 2289 }; 2290 2291 int dev_fsm_len = ARRAY_SIZE(dev_fsm); 2292 2293 /* --- This is the END my friend --- */ 2294 2295