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 (be16_to_cpu(skb->protocol) == 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 2301