1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2001, 2007 4 * Authors: Fritz Elfert (felfert@millenux.com) 5 * Peter Tiedemann (ptiedem@de.ibm.com) 6 * MPC additions : 7 * Belinda Thompson (belindat@us.ibm.com) 8 * Andy Richter (richtera@us.ibm.com) 9 */ 10 11 #undef DEBUG 12 #undef DEBUGDATA 13 #undef DEBUGCCW 14 15 #define KMSG_COMPONENT "ctcm" 16 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 17 18 #include <linux/module.h> 19 #include <linux/init.h> 20 #include <linux/kernel.h> 21 #include <linux/slab.h> 22 #include <linux/errno.h> 23 #include <linux/types.h> 24 #include <linux/interrupt.h> 25 #include <linux/timer.h> 26 #include <linux/bitops.h> 27 28 #include <linux/signal.h> 29 #include <linux/string.h> 30 31 #include <linux/ip.h> 32 #include <linux/if_arp.h> 33 #include <linux/tcp.h> 34 #include <linux/skbuff.h> 35 #include <linux/ctype.h> 36 #include <net/dst.h> 37 38 #include <linux/io.h> 39 #include <asm/ccwdev.h> 40 #include <asm/ccwgroup.h> 41 #include <linux/uaccess.h> 42 43 #include <asm/idals.h> 44 45 #include "fsm.h" 46 47 #include "ctcm_dbug.h" 48 #include "ctcm_main.h" 49 #include "ctcm_fsms.h" 50 51 const char *dev_state_names[] = { 52 [DEV_STATE_STOPPED] = "Stopped", 53 [DEV_STATE_STARTWAIT_RXTX] = "StartWait RXTX", 54 [DEV_STATE_STARTWAIT_RX] = "StartWait RX", 55 [DEV_STATE_STARTWAIT_TX] = "StartWait TX", 56 [DEV_STATE_STOPWAIT_RXTX] = "StopWait RXTX", 57 [DEV_STATE_STOPWAIT_RX] = "StopWait RX", 58 [DEV_STATE_STOPWAIT_TX] = "StopWait TX", 59 [DEV_STATE_RUNNING] = "Running", 60 }; 61 62 const char *dev_event_names[] = { 63 [DEV_EVENT_START] = "Start", 64 [DEV_EVENT_STOP] = "Stop", 65 [DEV_EVENT_RXUP] = "RX up", 66 [DEV_EVENT_TXUP] = "TX up", 67 [DEV_EVENT_RXDOWN] = "RX down", 68 [DEV_EVENT_TXDOWN] = "TX down", 69 [DEV_EVENT_RESTART] = "Restart", 70 }; 71 72 const char *ctc_ch_event_names[] = { 73 [CTC_EVENT_IO_SUCCESS] = "ccw_device success", 74 [CTC_EVENT_IO_EBUSY] = "ccw_device busy", 75 [CTC_EVENT_IO_ENODEV] = "ccw_device enodev", 76 [CTC_EVENT_IO_UNKNOWN] = "ccw_device unknown", 77 [CTC_EVENT_ATTNBUSY] = "Status ATTN & BUSY", 78 [CTC_EVENT_ATTN] = "Status ATTN", 79 [CTC_EVENT_BUSY] = "Status BUSY", 80 [CTC_EVENT_UC_RCRESET] = "Unit check remote reset", 81 [CTC_EVENT_UC_RSRESET] = "Unit check remote system reset", 82 [CTC_EVENT_UC_TXTIMEOUT] = "Unit check TX timeout", 83 [CTC_EVENT_UC_TXPARITY] = "Unit check TX parity", 84 [CTC_EVENT_UC_HWFAIL] = "Unit check Hardware failure", 85 [CTC_EVENT_UC_RXPARITY] = "Unit check RX parity", 86 [CTC_EVENT_UC_ZERO] = "Unit check ZERO", 87 [CTC_EVENT_UC_UNKNOWN] = "Unit check Unknown", 88 [CTC_EVENT_SC_UNKNOWN] = "SubChannel check Unknown", 89 [CTC_EVENT_MC_FAIL] = "Machine check failure", 90 [CTC_EVENT_MC_GOOD] = "Machine check operational", 91 [CTC_EVENT_IRQ] = "IRQ normal", 92 [CTC_EVENT_FINSTAT] = "IRQ final", 93 [CTC_EVENT_TIMER] = "Timer", 94 [CTC_EVENT_START] = "Start", 95 [CTC_EVENT_STOP] = "Stop", 96 /* 97 * additional MPC events 98 */ 99 [CTC_EVENT_SEND_XID] = "XID Exchange", 100 [CTC_EVENT_RSWEEP_TIMER] = "MPC Group Sweep Timer", 101 }; 102 103 const char *ctc_ch_state_names[] = { 104 [CTC_STATE_IDLE] = "Idle", 105 [CTC_STATE_STOPPED] = "Stopped", 106 [CTC_STATE_STARTWAIT] = "StartWait", 107 [CTC_STATE_STARTRETRY] = "StartRetry", 108 [CTC_STATE_SETUPWAIT] = "SetupWait", 109 [CTC_STATE_RXINIT] = "RX init", 110 [CTC_STATE_TXINIT] = "TX init", 111 [CTC_STATE_RX] = "RX", 112 [CTC_STATE_TX] = "TX", 113 [CTC_STATE_RXIDLE] = "RX idle", 114 [CTC_STATE_TXIDLE] = "TX idle", 115 [CTC_STATE_RXERR] = "RX error", 116 [CTC_STATE_TXERR] = "TX error", 117 [CTC_STATE_TERM] = "Terminating", 118 [CTC_STATE_DTERM] = "Restarting", 119 [CTC_STATE_NOTOP] = "Not operational", 120 /* 121 * additional MPC states 122 */ 123 [CH_XID0_PENDING] = "Pending XID0 Start", 124 [CH_XID0_INPROGRESS] = "In XID0 Negotiations ", 125 [CH_XID7_PENDING] = "Pending XID7 P1 Start", 126 [CH_XID7_PENDING1] = "Active XID7 P1 Exchange ", 127 [CH_XID7_PENDING2] = "Pending XID7 P2 Start ", 128 [CH_XID7_PENDING3] = "Active XID7 P2 Exchange ", 129 [CH_XID7_PENDING4] = "XID7 Complete - Pending READY ", 130 }; 131 132 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg); 133 134 /* 135 * ----- static ctcm actions for channel statemachine ----- 136 * 137 */ 138 static void chx_txdone(fsm_instance *fi, int event, void *arg); 139 static void chx_rx(fsm_instance *fi, int event, void *arg); 140 static void chx_rxidle(fsm_instance *fi, int event, void *arg); 141 static void chx_firstio(fsm_instance *fi, int event, void *arg); 142 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); 143 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); 144 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); 145 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); 146 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); 147 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); 148 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); 149 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); 150 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); 151 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); 152 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); 153 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); 154 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); 155 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); 156 157 /* 158 * ----- static ctcmpc actions for ctcmpc channel statemachine ----- 159 * 160 */ 161 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg); 162 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg); 163 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg); 164 /* shared : 165 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg); 166 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg); 167 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg); 168 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg); 169 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg); 170 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg); 171 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg); 172 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg); 173 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg); 174 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg); 175 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg); 176 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg); 177 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg); 178 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg); 179 */ 180 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg); 181 static void ctcmpc_chx_attnbusy(fsm_instance *, int, void *); 182 static void ctcmpc_chx_resend(fsm_instance *, int, void *); 183 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg); 184 185 /** 186 * Check return code of a preceding ccw_device call, halt_IO etc... 187 * 188 * ch : The channel, the error belongs to. 189 * Returns the error code (!= 0) to inspect. 190 */ 191 void ctcm_ccw_check_rc(struct channel *ch, int rc, char *msg) 192 { 193 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 194 "%s(%s): %s: %04x\n", 195 CTCM_FUNTAIL, ch->id, msg, rc); 196 switch (rc) { 197 case -EBUSY: 198 pr_info("%s: The communication peer is busy\n", 199 ch->id); 200 fsm_event(ch->fsm, CTC_EVENT_IO_EBUSY, ch); 201 break; 202 case -ENODEV: 203 pr_err("%s: The specified target device is not valid\n", 204 ch->id); 205 fsm_event(ch->fsm, CTC_EVENT_IO_ENODEV, ch); 206 break; 207 default: 208 pr_err("An I/O operation resulted in error %04x\n", 209 rc); 210 fsm_event(ch->fsm, CTC_EVENT_IO_UNKNOWN, ch); 211 } 212 } 213 214 void ctcm_purge_skb_queue(struct sk_buff_head *q) 215 { 216 struct sk_buff *skb; 217 218 CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __func__); 219 220 while ((skb = skb_dequeue(q))) { 221 refcount_dec(&skb->users); 222 dev_kfree_skb_any(skb); 223 } 224 } 225 226 /** 227 * NOP action for statemachines 228 */ 229 static void ctcm_action_nop(fsm_instance *fi, int event, void *arg) 230 { 231 } 232 233 /* 234 * Actions for channel - statemachines. 235 */ 236 237 /** 238 * Normal data has been send. Free the corresponding 239 * skb (it's in io_queue), reset dev->tbusy and 240 * revert to idle state. 241 * 242 * fi An instance of a channel statemachine. 243 * event The event, just happened. 244 * arg Generic pointer, casted from channel * upon call. 245 */ 246 static void chx_txdone(fsm_instance *fi, int event, void *arg) 247 { 248 struct channel *ch = arg; 249 struct net_device *dev = ch->netdev; 250 struct ctcm_priv *priv = dev->ml_priv; 251 struct sk_buff *skb; 252 int first = 1; 253 int i; 254 unsigned long duration; 255 unsigned long done_stamp = jiffies; 256 257 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 258 259 duration = done_stamp - ch->prof.send_stamp; 260 if (duration > ch->prof.tx_time) 261 ch->prof.tx_time = duration; 262 263 if (ch->irb->scsw.cmd.count != 0) 264 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 265 "%s(%s): TX not complete, remaining %d bytes", 266 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); 267 fsm_deltimer(&ch->timer); 268 while ((skb = skb_dequeue(&ch->io_queue))) { 269 priv->stats.tx_packets++; 270 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 271 if (first) { 272 priv->stats.tx_bytes += 2; 273 first = 0; 274 } 275 refcount_dec(&skb->users); 276 dev_kfree_skb_irq(skb); 277 } 278 spin_lock(&ch->collect_lock); 279 clear_normalized_cda(&ch->ccw[4]); 280 if (ch->collect_len > 0) { 281 int rc; 282 283 if (ctcm_checkalloc_buffer(ch)) { 284 spin_unlock(&ch->collect_lock); 285 return; 286 } 287 ch->trans_skb->data = ch->trans_skb_data; 288 skb_reset_tail_pointer(ch->trans_skb); 289 ch->trans_skb->len = 0; 290 if (ch->prof.maxmulti < (ch->collect_len + 2)) 291 ch->prof.maxmulti = ch->collect_len + 2; 292 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) 293 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); 294 *((__u16 *)skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; 295 i = 0; 296 while ((skb = skb_dequeue(&ch->collect_queue))) { 297 skb_copy_from_linear_data(skb, 298 skb_put(ch->trans_skb, skb->len), skb->len); 299 priv->stats.tx_packets++; 300 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; 301 refcount_dec(&skb->users); 302 dev_kfree_skb_irq(skb); 303 i++; 304 } 305 ch->collect_len = 0; 306 spin_unlock(&ch->collect_lock); 307 ch->ccw[1].count = ch->trans_skb->len; 308 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 309 ch->prof.send_stamp = jiffies; 310 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 311 (unsigned long)ch, 0xff, 0); 312 ch->prof.doios_multi++; 313 if (rc != 0) { 314 priv->stats.tx_dropped += i; 315 priv->stats.tx_errors += i; 316 fsm_deltimer(&ch->timer); 317 ctcm_ccw_check_rc(ch, rc, "chained TX"); 318 } 319 } else { 320 spin_unlock(&ch->collect_lock); 321 fsm_newstate(fi, CTC_STATE_TXIDLE); 322 } 323 ctcm_clear_busy_do(dev); 324 } 325 326 /** 327 * Initial data is sent. 328 * Notify device statemachine that we are up and 329 * running. 330 * 331 * fi An instance of a channel statemachine. 332 * event The event, just happened. 333 * arg Generic pointer, casted from channel * upon call. 334 */ 335 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) 336 { 337 struct channel *ch = arg; 338 struct net_device *dev = ch->netdev; 339 struct ctcm_priv *priv = dev->ml_priv; 340 341 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 342 343 fsm_deltimer(&ch->timer); 344 fsm_newstate(fi, CTC_STATE_TXIDLE); 345 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); 346 } 347 348 /** 349 * Got normal data, check for sanity, queue it up, allocate new buffer 350 * trigger bottom half, and initiate next read. 351 * 352 * fi An instance of a channel statemachine. 353 * event The event, just happened. 354 * arg Generic pointer, casted from channel * upon call. 355 */ 356 static void chx_rx(fsm_instance *fi, int event, void *arg) 357 { 358 struct channel *ch = arg; 359 struct net_device *dev = ch->netdev; 360 struct ctcm_priv *priv = dev->ml_priv; 361 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 362 struct sk_buff *skb = ch->trans_skb; 363 __u16 block_len = *((__u16 *)skb->data); 364 int check_len; 365 int rc; 366 367 fsm_deltimer(&ch->timer); 368 if (len < 8) { 369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 370 "%s(%s): got packet with length %d < 8\n", 371 CTCM_FUNTAIL, dev->name, len); 372 priv->stats.rx_dropped++; 373 priv->stats.rx_length_errors++; 374 goto again; 375 } 376 if (len > ch->max_bufsize) { 377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 378 "%s(%s): got packet with length %d > %d\n", 379 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); 380 priv->stats.rx_dropped++; 381 priv->stats.rx_length_errors++; 382 goto again; 383 } 384 385 /* 386 * VM TCP seems to have a bug sending 2 trailing bytes of garbage. 387 */ 388 switch (ch->protocol) { 389 case CTCM_PROTO_S390: 390 case CTCM_PROTO_OS390: 391 check_len = block_len + 2; 392 break; 393 default: 394 check_len = block_len; 395 break; 396 } 397 if ((len < block_len) || (len > check_len)) { 398 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 399 "%s(%s): got block length %d != rx length %d\n", 400 CTCM_FUNTAIL, dev->name, block_len, len); 401 if (do_debug) 402 ctcmpc_dump_skb(skb, 0); 403 404 *((__u16 *)skb->data) = len; 405 priv->stats.rx_dropped++; 406 priv->stats.rx_length_errors++; 407 goto again; 408 } 409 if (block_len > 2) { 410 *((__u16 *)skb->data) = block_len - 2; 411 ctcm_unpack_skb(ch, skb); 412 } 413 again: 414 skb->data = ch->trans_skb_data; 415 skb_reset_tail_pointer(skb); 416 skb->len = 0; 417 if (ctcm_checkalloc_buffer(ch)) 418 return; 419 ch->ccw[1].count = ch->max_bufsize; 420 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 421 (unsigned long)ch, 0xff, 0); 422 if (rc != 0) 423 ctcm_ccw_check_rc(ch, rc, "normal RX"); 424 } 425 426 /** 427 * Initialize connection by sending a __u16 of value 0. 428 * 429 * fi An instance of a channel statemachine. 430 * event The event, just happened. 431 * arg Generic pointer, casted from channel * upon call. 432 */ 433 static void chx_firstio(fsm_instance *fi, int event, void *arg) 434 { 435 int rc; 436 struct channel *ch = arg; 437 int fsmstate = fsm_getstate(fi); 438 439 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 440 "%s(%s) : %02x", 441 CTCM_FUNTAIL, ch->id, fsmstate); 442 443 ch->sense_rc = 0; /* reset unit check report control */ 444 if (fsmstate == CTC_STATE_TXIDLE) 445 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 446 "%s(%s): remote side issued READ?, init.\n", 447 CTCM_FUNTAIL, ch->id); 448 fsm_deltimer(&ch->timer); 449 if (ctcm_checkalloc_buffer(ch)) 450 return; 451 if ((fsmstate == CTC_STATE_SETUPWAIT) && 452 (ch->protocol == CTCM_PROTO_OS390)) { 453 /* OS/390 resp. z/OS */ 454 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 455 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 456 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, 457 CTC_EVENT_TIMER, ch); 458 chx_rxidle(fi, event, arg); 459 } else { 460 struct net_device *dev = ch->netdev; 461 struct ctcm_priv *priv = dev->ml_priv; 462 fsm_newstate(fi, CTC_STATE_TXIDLE); 463 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 464 } 465 return; 466 } 467 /* 468 * Don't setup a timer for receiving the initial RX frame 469 * if in compatibility mode, since VM TCP delays the initial 470 * frame until it has some data to send. 471 */ 472 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) || 473 (ch->protocol != CTCM_PROTO_S390)) 474 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 475 476 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 477 ch->ccw[1].count = 2; /* Transfer only length */ 478 479 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 480 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 481 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 482 (unsigned long)ch, 0xff, 0); 483 if (rc != 0) { 484 fsm_deltimer(&ch->timer); 485 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 486 ctcm_ccw_check_rc(ch, rc, "init IO"); 487 } 488 /* 489 * If in compatibility mode since we don't setup a timer, we 490 * also signal RX channel up immediately. This enables us 491 * to send packets early which in turn usually triggers some 492 * reply from VM TCP which brings up the RX channel to it's 493 * final state. 494 */ 495 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) && 496 (ch->protocol == CTCM_PROTO_S390)) { 497 struct net_device *dev = ch->netdev; 498 struct ctcm_priv *priv = dev->ml_priv; 499 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 500 } 501 } 502 503 /** 504 * Got initial data, check it. If OK, 505 * notify device statemachine that we are up and 506 * running. 507 * 508 * fi An instance of a channel statemachine. 509 * event The event, just happened. 510 * arg Generic pointer, casted from channel * upon call. 511 */ 512 static void chx_rxidle(fsm_instance *fi, int event, void *arg) 513 { 514 struct channel *ch = arg; 515 struct net_device *dev = ch->netdev; 516 struct ctcm_priv *priv = dev->ml_priv; 517 __u16 buflen; 518 int rc; 519 520 fsm_deltimer(&ch->timer); 521 buflen = *((__u16 *)ch->trans_skb->data); 522 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", 523 __func__, dev->name, buflen); 524 525 if (buflen >= CTCM_INITIAL_BLOCKLEN) { 526 if (ctcm_checkalloc_buffer(ch)) 527 return; 528 ch->ccw[1].count = ch->max_bufsize; 529 fsm_newstate(fi, CTC_STATE_RXIDLE); 530 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 531 (unsigned long)ch, 0xff, 0); 532 if (rc != 0) { 533 fsm_newstate(fi, CTC_STATE_RXINIT); 534 ctcm_ccw_check_rc(ch, rc, "initial RX"); 535 } else 536 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 537 } else { 538 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", 539 __func__, dev->name, 540 buflen, CTCM_INITIAL_BLOCKLEN); 541 chx_firstio(fi, event, arg); 542 } 543 } 544 545 /** 546 * Set channel into extended mode. 547 * 548 * fi An instance of a channel statemachine. 549 * event The event, just happened. 550 * arg Generic pointer, casted from channel * upon call. 551 */ 552 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) 553 { 554 struct channel *ch = arg; 555 int rc; 556 unsigned long saveflags = 0; 557 int timeout = CTCM_TIME_5_SEC; 558 559 fsm_deltimer(&ch->timer); 560 if (IS_MPC(ch)) { 561 timeout = 1500; 562 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n", 563 __func__, smp_processor_id(), ch, ch->id); 564 } 565 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch); 566 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 567 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2); 568 569 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 571 /* Such conditional locking is undeterministic in 572 * static view. => ignore sparse warnings here. */ 573 574 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 575 (unsigned long)ch, 0xff, 0); 576 if (event == CTC_EVENT_TIMER) /* see above comments */ 577 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 578 if (rc != 0) { 579 fsm_deltimer(&ch->timer); 580 fsm_newstate(fi, CTC_STATE_STARTWAIT); 581 ctcm_ccw_check_rc(ch, rc, "set Mode"); 582 } else 583 ch->retry = 0; 584 } 585 586 /** 587 * Setup channel. 588 * 589 * fi An instance of a channel statemachine. 590 * event The event, just happened. 591 * arg Generic pointer, casted from channel * upon call. 592 */ 593 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) 594 { 595 struct channel *ch = arg; 596 unsigned long saveflags; 597 int rc; 598 599 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", 600 CTCM_FUNTAIL, ch->id, 601 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX"); 602 603 if (ch->trans_skb != NULL) { 604 clear_normalized_cda(&ch->ccw[1]); 605 dev_kfree_skb(ch->trans_skb); 606 ch->trans_skb = NULL; 607 } 608 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 609 ch->ccw[1].cmd_code = CCW_CMD_READ; 610 ch->ccw[1].flags = CCW_FLAG_SLI; 611 ch->ccw[1].count = 0; 612 } else { 613 ch->ccw[1].cmd_code = CCW_CMD_WRITE; 614 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 615 ch->ccw[1].count = 0; 616 } 617 if (ctcm_checkalloc_buffer(ch)) { 618 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 619 "%s(%s): %s trans_skb alloc delayed " 620 "until first transfer", 621 CTCM_FUNTAIL, ch->id, 622 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 623 "RX" : "TX"); 624 } 625 ch->ccw[0].cmd_code = CCW_CMD_PREPARE; 626 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 627 ch->ccw[0].count = 0; 628 ch->ccw[0].cda = 0; 629 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ 630 ch->ccw[2].flags = CCW_FLAG_SLI; 631 ch->ccw[2].count = 0; 632 ch->ccw[2].cda = 0; 633 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); 634 ch->ccw[4].cda = 0; 635 ch->ccw[4].flags &= ~CCW_FLAG_IDA; 636 637 fsm_newstate(fi, CTC_STATE_STARTWAIT); 638 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 639 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 640 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 641 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 642 if (rc != 0) { 643 if (rc != -EBUSY) 644 fsm_deltimer(&ch->timer); 645 ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); 646 } 647 } 648 649 /** 650 * Shutdown a channel. 651 * 652 * fi An instance of a channel statemachine. 653 * event The event, just happened. 654 * arg Generic pointer, casted from channel * upon call. 655 */ 656 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) 657 { 658 struct channel *ch = arg; 659 unsigned long saveflags = 0; 660 int rc; 661 int oldstate; 662 663 fsm_deltimer(&ch->timer); 664 if (IS_MPC(ch)) 665 fsm_deltimer(&ch->sweep_timer); 666 667 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 668 669 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ 670 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 671 /* Such conditional locking is undeterministic in 672 * static view. => ignore sparse warnings here. */ 673 oldstate = fsm_getstate(fi); 674 fsm_newstate(fi, CTC_STATE_TERM); 675 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 676 677 if (event == CTC_EVENT_STOP) 678 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 679 /* see remark above about conditional locking */ 680 681 if (rc != 0 && rc != -EBUSY) { 682 fsm_deltimer(&ch->timer); 683 if (event != CTC_EVENT_STOP) { 684 fsm_newstate(fi, oldstate); 685 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 686 } 687 } 688 } 689 690 /** 691 * Cleanup helper for chx_fail and chx_stopped 692 * cleanup channels queue and notify interface statemachine. 693 * 694 * fi An instance of a channel statemachine. 695 * state The next state (depending on caller). 696 * ch The channel to operate on. 697 */ 698 static void ctcm_chx_cleanup(fsm_instance *fi, int state, 699 struct channel *ch) 700 { 701 struct net_device *dev = ch->netdev; 702 struct ctcm_priv *priv = dev->ml_priv; 703 704 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 705 "%s(%s): %s[%d]\n", 706 CTCM_FUNTAIL, dev->name, ch->id, state); 707 708 fsm_deltimer(&ch->timer); 709 if (IS_MPC(ch)) 710 fsm_deltimer(&ch->sweep_timer); 711 712 fsm_newstate(fi, state); 713 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { 714 clear_normalized_cda(&ch->ccw[1]); 715 dev_kfree_skb_any(ch->trans_skb); 716 ch->trans_skb = NULL; 717 } 718 719 ch->th_seg = 0x00; 720 ch->th_seq_num = 0x00; 721 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 722 skb_queue_purge(&ch->io_queue); 723 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 724 } else { 725 ctcm_purge_skb_queue(&ch->io_queue); 726 if (IS_MPC(ch)) 727 ctcm_purge_skb_queue(&ch->sweep_queue); 728 spin_lock(&ch->collect_lock); 729 ctcm_purge_skb_queue(&ch->collect_queue); 730 ch->collect_len = 0; 731 spin_unlock(&ch->collect_lock); 732 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 733 } 734 } 735 736 /** 737 * A channel has successfully been halted. 738 * Cleanup it's queue and notify interface statemachine. 739 * 740 * fi An instance of a channel statemachine. 741 * event The event, just happened. 742 * arg Generic pointer, casted from channel * upon call. 743 */ 744 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) 745 { 746 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); 747 } 748 749 /** 750 * A stop command from device statemachine arrived and we are in 751 * not operational mode. Set state to stopped. 752 * 753 * fi An instance of a channel statemachine. 754 * event The event, just happened. 755 * arg Generic pointer, casted from channel * upon call. 756 */ 757 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) 758 { 759 fsm_newstate(fi, CTC_STATE_STOPPED); 760 } 761 762 /** 763 * A machine check for no path, not operational status or gone device has 764 * happened. 765 * Cleanup queue and notify interface statemachine. 766 * 767 * fi An instance of a channel statemachine. 768 * event The event, just happened. 769 * arg Generic pointer, casted from channel * upon call. 770 */ 771 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) 772 { 773 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); 774 } 775 776 /** 777 * Handle error during setup of channel. 778 * 779 * fi An instance of a channel statemachine. 780 * event The event, just happened. 781 * arg Generic pointer, casted from channel * upon call. 782 */ 783 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) 784 { 785 struct channel *ch = arg; 786 struct net_device *dev = ch->netdev; 787 struct ctcm_priv *priv = dev->ml_priv; 788 789 /* 790 * Special case: Got UC_RCRESET on setmode. 791 * This means that remote side isn't setup. In this case 792 * simply retry after some 10 secs... 793 */ 794 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && 795 ((event == CTC_EVENT_UC_RCRESET) || 796 (event == CTC_EVENT_UC_RSRESET))) { 797 fsm_newstate(fi, CTC_STATE_STARTRETRY); 798 fsm_deltimer(&ch->timer); 799 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 800 if (!IS_MPC(ch) && 801 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) { 802 int rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 803 if (rc != 0) 804 ctcm_ccw_check_rc(ch, rc, 805 "HaltIO in chx_setuperr"); 806 } 807 return; 808 } 809 810 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 811 "%s(%s) : %s error during %s channel setup state=%s\n", 812 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], 813 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX", 814 fsm_getstate_str(fi)); 815 816 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 817 fsm_newstate(fi, CTC_STATE_RXERR); 818 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 819 } else { 820 fsm_newstate(fi, CTC_STATE_TXERR); 821 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 822 } 823 } 824 825 /** 826 * Restart a channel after an error. 827 * 828 * fi An instance of a channel statemachine. 829 * event The event, just happened. 830 * arg Generic pointer, casted from channel * upon call. 831 */ 832 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) 833 { 834 struct channel *ch = arg; 835 struct net_device *dev = ch->netdev; 836 unsigned long saveflags = 0; 837 int oldstate; 838 int rc; 839 840 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 841 "%s: %s[%d] of %s\n", 842 CTCM_FUNTAIL, ch->id, event, dev->name); 843 844 fsm_deltimer(&ch->timer); 845 846 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 847 oldstate = fsm_getstate(fi); 848 fsm_newstate(fi, CTC_STATE_STARTWAIT); 849 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 850 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 851 /* Such conditional locking is a known problem for 852 * sparse because its undeterministic in static view. 853 * Warnings should be ignored here. */ 854 rc = ccw_device_halt(ch->cdev, (unsigned long)ch); 855 if (event == CTC_EVENT_TIMER) 856 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 857 if (rc != 0) { 858 if (rc != -EBUSY) { 859 fsm_deltimer(&ch->timer); 860 fsm_newstate(fi, oldstate); 861 } 862 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); 863 } 864 } 865 866 /** 867 * Handle error during RX initial handshake (exchange of 868 * 0-length block header) 869 * 870 * fi An instance of a channel statemachine. 871 * event The event, just happened. 872 * arg Generic pointer, casted from channel * upon call. 873 */ 874 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) 875 { 876 struct channel *ch = arg; 877 struct net_device *dev = ch->netdev; 878 struct ctcm_priv *priv = dev->ml_priv; 879 880 if (event == CTC_EVENT_TIMER) { 881 if (!IS_MPCDEV(dev)) 882 /* TODO : check if MPC deletes timer somewhere */ 883 fsm_deltimer(&ch->timer); 884 if (ch->retry++ < 3) 885 ctcm_chx_restart(fi, event, arg); 886 else { 887 fsm_newstate(fi, CTC_STATE_RXERR); 888 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 889 } 890 } else { 891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 892 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 893 ctc_ch_event_names[event], fsm_getstate_str(fi)); 894 895 dev_warn(&dev->dev, 896 "Initialization failed with RX/TX init handshake " 897 "error %s\n", ctc_ch_event_names[event]); 898 } 899 } 900 901 /** 902 * Notify device statemachine if we gave up initialization 903 * of RX channel. 904 * 905 * fi An instance of a channel statemachine. 906 * event The event, just happened. 907 * arg Generic pointer, casted from channel * upon call. 908 */ 909 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) 910 { 911 struct channel *ch = arg; 912 struct net_device *dev = ch->netdev; 913 struct ctcm_priv *priv = dev->ml_priv; 914 915 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 916 "%s(%s): RX %s busy, init. fail", 917 CTCM_FUNTAIL, dev->name, ch->id); 918 fsm_newstate(fi, CTC_STATE_RXERR); 919 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 920 } 921 922 /** 923 * Handle RX Unit check remote reset (remote disconnected) 924 * 925 * fi An instance of a channel statemachine. 926 * event The event, just happened. 927 * arg Generic pointer, casted from channel * upon call. 928 */ 929 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) 930 { 931 struct channel *ch = arg; 932 struct channel *ch2; 933 struct net_device *dev = ch->netdev; 934 struct ctcm_priv *priv = dev->ml_priv; 935 936 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 937 "%s: %s: remote disconnect - re-init ...", 938 CTCM_FUNTAIL, dev->name); 939 fsm_deltimer(&ch->timer); 940 /* 941 * Notify device statemachine 942 */ 943 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 944 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 945 946 fsm_newstate(fi, CTC_STATE_DTERM); 947 ch2 = priv->channel[CTCM_WRITE]; 948 fsm_newstate(ch2->fsm, CTC_STATE_DTERM); 949 950 ccw_device_halt(ch->cdev, (unsigned long)ch); 951 ccw_device_halt(ch2->cdev, (unsigned long)ch2); 952 } 953 954 /** 955 * Handle error during TX channel initialization. 956 * 957 * fi An instance of a channel statemachine. 958 * event The event, just happened. 959 * arg Generic pointer, casted from channel * upon call. 960 */ 961 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) 962 { 963 struct channel *ch = arg; 964 struct net_device *dev = ch->netdev; 965 struct ctcm_priv *priv = dev->ml_priv; 966 967 if (event == CTC_EVENT_TIMER) { 968 fsm_deltimer(&ch->timer); 969 if (ch->retry++ < 3) 970 ctcm_chx_restart(fi, event, arg); 971 else { 972 fsm_newstate(fi, CTC_STATE_TXERR); 973 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 974 } 975 } else { 976 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 977 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 978 ctc_ch_event_names[event], fsm_getstate_str(fi)); 979 980 dev_warn(&dev->dev, 981 "Initialization failed with RX/TX init handshake " 982 "error %s\n", ctc_ch_event_names[event]); 983 } 984 } 985 986 /** 987 * Handle TX timeout by retrying operation. 988 * 989 * fi An instance of a channel statemachine. 990 * event The event, just happened. 991 * arg Generic pointer, casted from channel * upon call. 992 */ 993 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) 994 { 995 struct channel *ch = arg; 996 struct net_device *dev = ch->netdev; 997 struct ctcm_priv *priv = dev->ml_priv; 998 struct sk_buff *skb; 999 1000 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", 1001 __func__, smp_processor_id(), ch, ch->id); 1002 1003 fsm_deltimer(&ch->timer); 1004 if (ch->retry++ > 3) { 1005 struct mpc_group *gptr = priv->mpcg; 1006 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1007 "%s: %s: retries exceeded", 1008 CTCM_FUNTAIL, ch->id); 1009 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1010 /* call restart if not MPC or if MPC and mpcg fsm is ready. 1011 use gptr as mpc indicator */ 1012 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) 1013 ctcm_chx_restart(fi, event, arg); 1014 goto done; 1015 } 1016 1017 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1018 "%s : %s: retry %d", 1019 CTCM_FUNTAIL, ch->id, ch->retry); 1020 skb = skb_peek(&ch->io_queue); 1021 if (skb) { 1022 int rc = 0; 1023 unsigned long saveflags = 0; 1024 clear_normalized_cda(&ch->ccw[4]); 1025 ch->ccw[4].count = skb->len; 1026 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 1027 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1028 "%s: %s: IDAL alloc failed", 1029 CTCM_FUNTAIL, ch->id); 1030 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1031 ctcm_chx_restart(fi, event, arg); 1032 goto done; 1033 } 1034 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 1035 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ 1036 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1037 /* Such conditional locking is a known problem for 1038 * sparse because its undeterministic in static view. 1039 * Warnings should be ignored here. */ 1040 if (do_debug_ccw) 1041 ctcmpc_dumpit((char *)&ch->ccw[3], 1042 sizeof(struct ccw1) * 3); 1043 1044 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 1045 (unsigned long)ch, 0xff, 0); 1046 if (event == CTC_EVENT_TIMER) 1047 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), 1048 saveflags); 1049 if (rc != 0) { 1050 fsm_deltimer(&ch->timer); 1051 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry"); 1052 ctcm_purge_skb_queue(&ch->io_queue); 1053 } 1054 } 1055 done: 1056 return; 1057 } 1058 1059 /** 1060 * Handle fatal errors during an I/O command. 1061 * 1062 * fi An instance of a channel statemachine. 1063 * event The event, just happened. 1064 * arg Generic pointer, casted from channel * upon call. 1065 */ 1066 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg) 1067 { 1068 struct channel *ch = arg; 1069 struct net_device *dev = ch->netdev; 1070 struct ctcm_priv *priv = dev->ml_priv; 1071 int rd = CHANNEL_DIRECTION(ch->flags); 1072 1073 fsm_deltimer(&ch->timer); 1074 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1075 "%s: %s: %s unrecoverable channel error", 1076 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX"); 1077 1078 if (IS_MPC(ch)) { 1079 priv->stats.tx_dropped++; 1080 priv->stats.tx_errors++; 1081 } 1082 if (rd == CTCM_READ) { 1083 fsm_newstate(fi, CTC_STATE_RXERR); 1084 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 1085 } else { 1086 fsm_newstate(fi, CTC_STATE_TXERR); 1087 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1088 } 1089 } 1090 1091 /* 1092 * The ctcm statemachine for a channel. 1093 */ 1094 const fsm_node ch_fsm[] = { 1095 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1096 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1097 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1098 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1099 1100 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1101 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1102 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1103 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1104 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1105 1106 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1107 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1108 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1109 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1110 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1111 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1112 1113 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1114 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1115 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1116 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1117 1118 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1119 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1120 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio }, 1121 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1122 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1123 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1124 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1125 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1126 1127 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1128 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1129 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle }, 1130 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1131 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1132 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1133 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1134 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1135 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio }, 1136 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1137 1138 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1139 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1140 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx }, 1141 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1142 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1143 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1144 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx }, 1145 1146 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1147 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 1148 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 1149 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 1150 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 1151 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 1152 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1153 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1154 1155 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1156 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1157 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio }, 1158 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1159 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1160 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1161 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1162 1163 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 1164 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 1165 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 1166 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1167 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1168 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1169 1170 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 1171 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 1172 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1173 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1174 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1175 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1176 1177 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 1178 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 1179 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone }, 1180 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry }, 1181 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry }, 1182 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 1183 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1184 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1185 1186 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1187 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1188 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1189 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1190 }; 1191 1192 int ch_fsm_len = ARRAY_SIZE(ch_fsm); 1193 1194 /* 1195 * MPC actions for mpc channel statemachine 1196 * handling of MPC protocol requires extra 1197 * statemachine and actions which are prefixed ctcmpc_ . 1198 * The ctc_ch_states and ctc_ch_state_names, 1199 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions 1200 * which are expanded by some elements. 1201 */ 1202 1203 /* 1204 * Actions for mpc channel statemachine. 1205 */ 1206 1207 /** 1208 * Normal data has been send. Free the corresponding 1209 * skb (it's in io_queue), reset dev->tbusy and 1210 * revert to idle state. 1211 * 1212 * fi An instance of a channel statemachine. 1213 * event The event, just happened. 1214 * arg Generic pointer, casted from channel * upon call. 1215 */ 1216 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg) 1217 { 1218 struct channel *ch = arg; 1219 struct net_device *dev = ch->netdev; 1220 struct ctcm_priv *priv = dev->ml_priv; 1221 struct mpc_group *grp = priv->mpcg; 1222 struct sk_buff *skb; 1223 int first = 1; 1224 int i; 1225 __u32 data_space; 1226 unsigned long duration; 1227 struct sk_buff *peekskb; 1228 int rc; 1229 struct th_header *header; 1230 struct pdu *p_header; 1231 unsigned long done_stamp = jiffies; 1232 1233 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n", 1234 __func__, dev->name, smp_processor_id()); 1235 1236 duration = done_stamp - ch->prof.send_stamp; 1237 if (duration > ch->prof.tx_time) 1238 ch->prof.tx_time = duration; 1239 1240 if (ch->irb->scsw.cmd.count != 0) 1241 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1242 "%s(%s): TX not complete, remaining %d bytes", 1243 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); 1244 fsm_deltimer(&ch->timer); 1245 while ((skb = skb_dequeue(&ch->io_queue))) { 1246 priv->stats.tx_packets++; 1247 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 1248 if (first) { 1249 priv->stats.tx_bytes += 2; 1250 first = 0; 1251 } 1252 refcount_dec(&skb->users); 1253 dev_kfree_skb_irq(skb); 1254 } 1255 spin_lock(&ch->collect_lock); 1256 clear_normalized_cda(&ch->ccw[4]); 1257 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) { 1258 spin_unlock(&ch->collect_lock); 1259 fsm_newstate(fi, CTC_STATE_TXIDLE); 1260 goto done; 1261 } 1262 1263 if (ctcm_checkalloc_buffer(ch)) { 1264 spin_unlock(&ch->collect_lock); 1265 goto done; 1266 } 1267 ch->trans_skb->data = ch->trans_skb_data; 1268 skb_reset_tail_pointer(ch->trans_skb); 1269 ch->trans_skb->len = 0; 1270 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH)) 1271 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH; 1272 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) 1273 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); 1274 i = 0; 1275 p_header = NULL; 1276 data_space = grp->group_max_buflen - TH_HEADER_LENGTH; 1277 1278 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q" 1279 " data_space:%04x\n", 1280 __func__, data_space); 1281 1282 while ((skb = skb_dequeue(&ch->collect_queue))) { 1283 skb_put_data(ch->trans_skb, skb->data, skb->len); 1284 p_header = (struct pdu *) 1285 (skb_tail_pointer(ch->trans_skb) - skb->len); 1286 p_header->pdu_flag = 0x00; 1287 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) 1288 p_header->pdu_flag |= 0x60; 1289 else 1290 p_header->pdu_flag |= 0x20; 1291 1292 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1293 __func__, ch->trans_skb->len); 1294 CTCM_PR_DBGDATA("%s: pdu header and data for up" 1295 " to 32 bytes sent to vtam\n", __func__); 1296 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32)); 1297 1298 ch->collect_len -= skb->len; 1299 data_space -= skb->len; 1300 priv->stats.tx_packets++; 1301 priv->stats.tx_bytes += skb->len; 1302 refcount_dec(&skb->users); 1303 dev_kfree_skb_any(skb); 1304 peekskb = skb_peek(&ch->collect_queue); 1305 if (peekskb->len > data_space) 1306 break; 1307 i++; 1308 } 1309 /* p_header points to the last one we handled */ 1310 if (p_header) 1311 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/ 1312 header = kzalloc(TH_HEADER_LENGTH, gfp_type()); 1313 if (!header) { 1314 spin_unlock(&ch->collect_lock); 1315 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1316 goto done; 1317 } 1318 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 1319 ch->th_seq_num++; 1320 header->th_seq_num = ch->th_seq_num; 1321 1322 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , 1323 __func__, ch->th_seq_num); 1324 1325 memcpy(skb_push(ch->trans_skb, TH_HEADER_LENGTH), header, 1326 TH_HEADER_LENGTH); /* put the TH on the packet */ 1327 1328 kfree(header); 1329 1330 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1331 __func__, ch->trans_skb->len); 1332 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " 1333 "data to vtam from collect_q\n", __func__); 1334 CTCM_D3_DUMP((char *)ch->trans_skb->data, 1335 min_t(int, ch->trans_skb->len, 50)); 1336 1337 spin_unlock(&ch->collect_lock); 1338 clear_normalized_cda(&ch->ccw[1]); 1339 1340 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1341 (void *)(unsigned long)ch->ccw[1].cda, 1342 ch->trans_skb->data); 1343 ch->ccw[1].count = ch->max_bufsize; 1344 1345 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 1346 dev_kfree_skb_any(ch->trans_skb); 1347 ch->trans_skb = NULL; 1348 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 1349 "%s: %s: IDAL alloc failed", 1350 CTCM_FUNTAIL, ch->id); 1351 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1352 return; 1353 } 1354 1355 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1356 (void *)(unsigned long)ch->ccw[1].cda, 1357 ch->trans_skb->data); 1358 1359 ch->ccw[1].count = ch->trans_skb->len; 1360 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 1361 ch->prof.send_stamp = jiffies; 1362 if (do_debug_ccw) 1363 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1364 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 1365 (unsigned long)ch, 0xff, 0); 1366 ch->prof.doios_multi++; 1367 if (rc != 0) { 1368 priv->stats.tx_dropped += i; 1369 priv->stats.tx_errors += i; 1370 fsm_deltimer(&ch->timer); 1371 ctcm_ccw_check_rc(ch, rc, "chained TX"); 1372 } 1373 done: 1374 ctcm_clear_busy(dev); 1375 return; 1376 } 1377 1378 /** 1379 * Got normal data, check for sanity, queue it up, allocate new buffer 1380 * trigger bottom half, and initiate next read. 1381 * 1382 * fi An instance of a channel statemachine. 1383 * event The event, just happened. 1384 * arg Generic pointer, casted from channel * upon call. 1385 */ 1386 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg) 1387 { 1388 struct channel *ch = arg; 1389 struct net_device *dev = ch->netdev; 1390 struct ctcm_priv *priv = dev->ml_priv; 1391 struct mpc_group *grp = priv->mpcg; 1392 struct sk_buff *skb = ch->trans_skb; 1393 struct sk_buff *new_skb; 1394 unsigned long saveflags = 0; /* avoids compiler warning */ 1395 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 1396 1397 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n", 1398 CTCM_FUNTAIL, dev->name, smp_processor_id(), 1399 ch->id, ch->max_bufsize, len); 1400 fsm_deltimer(&ch->timer); 1401 1402 if (skb == NULL) { 1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1404 "%s(%s): TRANS_SKB = NULL", 1405 CTCM_FUNTAIL, dev->name); 1406 goto again; 1407 } 1408 1409 if (len < TH_HEADER_LENGTH) { 1410 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1411 "%s(%s): packet length %d to short", 1412 CTCM_FUNTAIL, dev->name, len); 1413 priv->stats.rx_dropped++; 1414 priv->stats.rx_length_errors++; 1415 } else { 1416 /* must have valid th header or game over */ 1417 __u32 block_len = len; 1418 len = TH_HEADER_LENGTH + XID2_LENGTH + 4; 1419 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC); 1420 1421 if (new_skb == NULL) { 1422 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1423 "%s(%d): skb allocation failed", 1424 CTCM_FUNTAIL, dev->name); 1425 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1426 goto again; 1427 } 1428 switch (fsm_getstate(grp->fsm)) { 1429 case MPCG_STATE_RESET: 1430 case MPCG_STATE_INOP: 1431 dev_kfree_skb_any(new_skb); 1432 break; 1433 case MPCG_STATE_FLOWC: 1434 case MPCG_STATE_READY: 1435 skb_put_data(new_skb, skb->data, block_len); 1436 skb_queue_tail(&ch->io_queue, new_skb); 1437 tasklet_schedule(&ch->ch_tasklet); 1438 break; 1439 default: 1440 skb_put_data(new_skb, 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 refcount_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