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 pr_fmt(fmt) "ctcm: " 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 refcount_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 refcount_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 refcount_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], 0, 0xff, 0); 310 ch->prof.doios_multi++; 311 if (rc != 0) { 312 priv->stats.tx_dropped += i; 313 priv->stats.tx_errors += i; 314 fsm_deltimer(&ch->timer); 315 ctcm_ccw_check_rc(ch, rc, "chained TX"); 316 } 317 } else { 318 spin_unlock(&ch->collect_lock); 319 fsm_newstate(fi, CTC_STATE_TXIDLE); 320 } 321 ctcm_clear_busy_do(dev); 322 } 323 324 /* 325 * Initial data is sent. 326 * Notify device statemachine that we are up and 327 * running. 328 * 329 * fi An instance of a channel statemachine. 330 * event The event, just happened. 331 * arg Generic pointer, casted from channel * upon call. 332 */ 333 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) 334 { 335 struct channel *ch = arg; 336 struct net_device *dev = ch->netdev; 337 struct ctcm_priv *priv = dev->ml_priv; 338 339 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 340 341 fsm_deltimer(&ch->timer); 342 fsm_newstate(fi, CTC_STATE_TXIDLE); 343 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); 344 } 345 346 /* 347 * Got normal data, check for sanity, queue it up, allocate new buffer 348 * trigger bottom half, and initiate next read. 349 * 350 * fi An instance of a channel statemachine. 351 * event The event, just happened. 352 * arg Generic pointer, casted from channel * upon call. 353 */ 354 static void chx_rx(fsm_instance *fi, int event, void *arg) 355 { 356 struct channel *ch = arg; 357 struct net_device *dev = ch->netdev; 358 struct ctcm_priv *priv = dev->ml_priv; 359 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 360 struct sk_buff *skb = ch->trans_skb; 361 __u16 block_len = *((__u16 *)skb->data); 362 int check_len; 363 int rc; 364 365 fsm_deltimer(&ch->timer); 366 if (len < 8) { 367 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 368 "%s(%s): got packet with length %d < 8\n", 369 CTCM_FUNTAIL, dev->name, len); 370 priv->stats.rx_dropped++; 371 priv->stats.rx_length_errors++; 372 goto again; 373 } 374 if (len > ch->max_bufsize) { 375 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 376 "%s(%s): got packet with length %d > %d\n", 377 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); 378 priv->stats.rx_dropped++; 379 priv->stats.rx_length_errors++; 380 goto again; 381 } 382 383 /* 384 * VM TCP seems to have a bug sending 2 trailing bytes of garbage. 385 */ 386 switch (ch->protocol) { 387 case CTCM_PROTO_S390: 388 case CTCM_PROTO_OS390: 389 check_len = block_len + 2; 390 break; 391 default: 392 check_len = block_len; 393 break; 394 } 395 if ((len < block_len) || (len > check_len)) { 396 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 397 "%s(%s): got block length %d != rx length %d\n", 398 CTCM_FUNTAIL, dev->name, block_len, len); 399 if (do_debug) 400 ctcmpc_dump_skb(skb, 0); 401 402 *((__u16 *)skb->data) = len; 403 priv->stats.rx_dropped++; 404 priv->stats.rx_length_errors++; 405 goto again; 406 } 407 if (block_len > 2) { 408 *((__u16 *)skb->data) = block_len - 2; 409 ctcm_unpack_skb(ch, skb); 410 } 411 again: 412 skb->data = ch->trans_skb_data; 413 skb_reset_tail_pointer(skb); 414 skb->len = 0; 415 if (ctcm_checkalloc_buffer(ch)) 416 return; 417 ch->ccw[1].count = ch->max_bufsize; 418 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 419 if (rc != 0) 420 ctcm_ccw_check_rc(ch, rc, "normal RX"); 421 } 422 423 /* 424 * Initialize connection by sending a __u16 of value 0. 425 * 426 * fi An instance of a channel statemachine. 427 * event The event, just happened. 428 * arg Generic pointer, casted from channel * upon call. 429 */ 430 static void chx_firstio(fsm_instance *fi, int event, void *arg) 431 { 432 int rc; 433 struct channel *ch = arg; 434 int fsmstate = fsm_getstate(fi); 435 436 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 437 "%s(%s) : %02x", 438 CTCM_FUNTAIL, ch->id, fsmstate); 439 440 ch->sense_rc = 0; /* reset unit check report control */ 441 if (fsmstate == CTC_STATE_TXIDLE) 442 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 443 "%s(%s): remote side issued READ?, init.\n", 444 CTCM_FUNTAIL, ch->id); 445 fsm_deltimer(&ch->timer); 446 if (ctcm_checkalloc_buffer(ch)) 447 return; 448 if ((fsmstate == CTC_STATE_SETUPWAIT) && 449 (ch->protocol == CTCM_PROTO_OS390)) { 450 /* OS/390 resp. z/OS */ 451 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 452 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 453 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, 454 CTC_EVENT_TIMER, ch); 455 chx_rxidle(fi, event, arg); 456 } else { 457 struct net_device *dev = ch->netdev; 458 struct ctcm_priv *priv = dev->ml_priv; 459 fsm_newstate(fi, CTC_STATE_TXIDLE); 460 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 461 } 462 return; 463 } 464 /* 465 * Don't setup a timer for receiving the initial RX frame 466 * if in compatibility mode, since VM TCP delays the initial 467 * frame until it has some data to send. 468 */ 469 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) || 470 (ch->protocol != CTCM_PROTO_S390)) 471 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 472 473 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 474 ch->ccw[1].count = 2; /* Transfer only length */ 475 476 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 477 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 478 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 479 if (rc != 0) { 480 fsm_deltimer(&ch->timer); 481 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 482 ctcm_ccw_check_rc(ch, rc, "init IO"); 483 } 484 /* 485 * If in compatibility mode since we don't setup a timer, we 486 * also signal RX channel up immediately. This enables us 487 * to send packets early which in turn usually triggers some 488 * reply from VM TCP which brings up the RX channel to it's 489 * final state. 490 */ 491 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) && 492 (ch->protocol == CTCM_PROTO_S390)) { 493 struct net_device *dev = ch->netdev; 494 struct ctcm_priv *priv = dev->ml_priv; 495 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 496 } 497 } 498 499 /* 500 * Got initial data, check it. If OK, 501 * notify device statemachine that we are up and 502 * running. 503 * 504 * fi An instance of a channel statemachine. 505 * event The event, just happened. 506 * arg Generic pointer, casted from channel * upon call. 507 */ 508 static void chx_rxidle(fsm_instance *fi, int event, void *arg) 509 { 510 struct channel *ch = arg; 511 struct net_device *dev = ch->netdev; 512 struct ctcm_priv *priv = dev->ml_priv; 513 __u16 buflen; 514 int rc; 515 516 fsm_deltimer(&ch->timer); 517 buflen = *((__u16 *)ch->trans_skb->data); 518 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", 519 __func__, dev->name, buflen); 520 521 if (buflen >= CTCM_INITIAL_BLOCKLEN) { 522 if (ctcm_checkalloc_buffer(ch)) 523 return; 524 ch->ccw[1].count = ch->max_bufsize; 525 fsm_newstate(fi, CTC_STATE_RXIDLE); 526 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 527 if (rc != 0) { 528 fsm_newstate(fi, CTC_STATE_RXINIT); 529 ctcm_ccw_check_rc(ch, rc, "initial RX"); 530 } else 531 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 532 } else { 533 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", 534 __func__, dev->name, 535 buflen, CTCM_INITIAL_BLOCKLEN); 536 chx_firstio(fi, event, arg); 537 } 538 } 539 540 /* 541 * Set channel into extended mode. 542 * 543 * fi An instance of a channel statemachine. 544 * event The event, just happened. 545 * arg Generic pointer, casted from channel * upon call. 546 */ 547 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) 548 __context_unsafe(/* Conditional locking */) 549 { 550 struct channel *ch = arg; 551 int rc; 552 unsigned long saveflags = 0; 553 int timeout = CTCM_TIME_5_SEC; 554 555 fsm_deltimer(&ch->timer); 556 if (IS_MPC(ch)) { 557 timeout = 1500; 558 CTCM_PR_DEBUG("enter %s: cp=%i ch=0x%p id=%s\n", 559 __func__, smp_processor_id(), ch, ch->id); 560 } 561 fsm_addtimer(&ch->timer, timeout, CTC_EVENT_TIMER, ch); 562 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 563 CTCM_CCW_DUMP((char *)&ch->ccw[6], sizeof(struct ccw1) * 2); 564 565 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 566 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 567 568 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0); 569 if (event == CTC_EVENT_TIMER) /* see above comments */ 570 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 571 if (rc != 0) { 572 fsm_deltimer(&ch->timer); 573 fsm_newstate(fi, CTC_STATE_STARTWAIT); 574 ctcm_ccw_check_rc(ch, rc, "set Mode"); 575 } else 576 ch->retry = 0; 577 } 578 579 /* 580 * Setup channel. 581 * 582 * fi An instance of a channel statemachine. 583 * event The event, just happened. 584 * arg Generic pointer, casted from channel * upon call. 585 */ 586 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) 587 { 588 struct channel *ch = arg; 589 unsigned long saveflags; 590 int rc; 591 592 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", 593 CTCM_FUNTAIL, ch->id, 594 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX"); 595 596 if (ch->trans_skb != NULL) { 597 clear_normalized_cda(&ch->ccw[1]); 598 dev_kfree_skb(ch->trans_skb); 599 ch->trans_skb = NULL; 600 } 601 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 602 ch->ccw[1].cmd_code = CCW_CMD_READ; 603 ch->ccw[1].flags = CCW_FLAG_SLI; 604 ch->ccw[1].count = 0; 605 } else { 606 ch->ccw[1].cmd_code = CCW_CMD_WRITE; 607 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 608 ch->ccw[1].count = 0; 609 } 610 if (ctcm_checkalloc_buffer(ch)) { 611 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 612 "%s(%s): %s trans_skb alloc delayed " 613 "until first transfer", 614 CTCM_FUNTAIL, ch->id, 615 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 616 "RX" : "TX"); 617 } 618 ch->ccw[0].cmd_code = CCW_CMD_PREPARE; 619 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 620 ch->ccw[0].count = 0; 621 ch->ccw[0].cda = 0; 622 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ 623 ch->ccw[2].flags = CCW_FLAG_SLI; 624 ch->ccw[2].count = 0; 625 ch->ccw[2].cda = 0; 626 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); 627 ch->ccw[4].cda = 0; 628 ch->ccw[4].flags &= ~CCW_FLAG_IDA; 629 630 fsm_newstate(fi, CTC_STATE_STARTWAIT); 631 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 632 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 633 rc = ccw_device_halt(ch->cdev, 0); 634 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 635 if (rc != 0) { 636 if (rc != -EBUSY) 637 fsm_deltimer(&ch->timer); 638 ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); 639 } 640 } 641 642 /* 643 * Shutdown a channel. 644 * 645 * fi An instance of a channel statemachine. 646 * event The event, just happened. 647 * arg Generic pointer, casted from channel * upon call. 648 */ 649 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) 650 __context_unsafe(/* Conditional locking */) 651 { 652 struct channel *ch = arg; 653 unsigned long saveflags = 0; 654 int rc; 655 int oldstate; 656 657 fsm_deltimer(&ch->timer); 658 if (IS_MPC(ch)) 659 fsm_deltimer(&ch->sweep_timer); 660 661 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 662 663 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ 664 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 665 oldstate = fsm_getstate(fi); 666 fsm_newstate(fi, CTC_STATE_TERM); 667 rc = ccw_device_halt(ch->cdev, 0); 668 669 if (event == CTC_EVENT_STOP) 670 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 671 672 if (rc != 0 && rc != -EBUSY) { 673 fsm_deltimer(&ch->timer); 674 if (event != CTC_EVENT_STOP) { 675 fsm_newstate(fi, oldstate); 676 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 677 } 678 } 679 } 680 681 /* 682 * Cleanup helper for chx_fail and chx_stopped 683 * cleanup channels queue and notify interface statemachine. 684 * 685 * fi An instance of a channel statemachine. 686 * state The next state (depending on caller). 687 * ch The channel to operate on. 688 */ 689 static void ctcm_chx_cleanup(fsm_instance *fi, int state, 690 struct channel *ch) 691 { 692 struct net_device *dev = ch->netdev; 693 struct ctcm_priv *priv = dev->ml_priv; 694 695 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 696 "%s(%s): %s[%d]\n", 697 CTCM_FUNTAIL, dev->name, ch->id, state); 698 699 fsm_deltimer(&ch->timer); 700 if (IS_MPC(ch)) 701 fsm_deltimer(&ch->sweep_timer); 702 703 fsm_newstate(fi, state); 704 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { 705 clear_normalized_cda(&ch->ccw[1]); 706 dev_kfree_skb_any(ch->trans_skb); 707 ch->trans_skb = NULL; 708 } 709 710 ch->th_seg = 0x00; 711 ch->th_seq_num = 0x00; 712 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 713 skb_queue_purge(&ch->io_queue); 714 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 715 } else { 716 ctcm_purge_skb_queue(&ch->io_queue); 717 if (IS_MPC(ch)) 718 ctcm_purge_skb_queue(&ch->sweep_queue); 719 spin_lock(&ch->collect_lock); 720 ctcm_purge_skb_queue(&ch->collect_queue); 721 ch->collect_len = 0; 722 spin_unlock(&ch->collect_lock); 723 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 724 } 725 } 726 727 /* 728 * A channel has successfully been halted. 729 * Cleanup it's queue and notify interface statemachine. 730 * 731 * fi An instance of a channel statemachine. 732 * event The event, just happened. 733 * arg Generic pointer, casted from channel * upon call. 734 */ 735 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) 736 { 737 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); 738 } 739 740 /* 741 * A stop command from device statemachine arrived and we are in 742 * not operational mode. Set state to stopped. 743 * 744 * fi An instance of a channel statemachine. 745 * event The event, just happened. 746 * arg Generic pointer, casted from channel * upon call. 747 */ 748 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) 749 { 750 fsm_newstate(fi, CTC_STATE_STOPPED); 751 } 752 753 /* 754 * A machine check for no path, not operational status or gone device has 755 * happened. 756 * Cleanup queue and notify interface statemachine. 757 * 758 * fi An instance of a channel statemachine. 759 * event The event, just happened. 760 * arg Generic pointer, casted from channel * upon call. 761 */ 762 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) 763 { 764 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); 765 } 766 767 /* 768 * Handle error during setup of channel. 769 * 770 * fi An instance of a channel statemachine. 771 * event The event, just happened. 772 * arg Generic pointer, casted from channel * upon call. 773 */ 774 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) 775 { 776 struct channel *ch = arg; 777 struct net_device *dev = ch->netdev; 778 struct ctcm_priv *priv = dev->ml_priv; 779 780 /* 781 * Special case: Got UC_RCRESET on setmode. 782 * This means that remote side isn't setup. In this case 783 * simply retry after some 10 secs... 784 */ 785 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && 786 ((event == CTC_EVENT_UC_RCRESET) || 787 (event == CTC_EVENT_UC_RSRESET))) { 788 fsm_newstate(fi, CTC_STATE_STARTRETRY); 789 fsm_deltimer(&ch->timer); 790 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 791 if (!IS_MPC(ch) && 792 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) { 793 int rc = ccw_device_halt(ch->cdev, 0); 794 if (rc != 0) 795 ctcm_ccw_check_rc(ch, rc, 796 "HaltIO in chx_setuperr"); 797 } 798 return; 799 } 800 801 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 802 "%s(%s) : %s error during %s channel setup state=%s\n", 803 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], 804 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX", 805 fsm_getstate_str(fi)); 806 807 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 808 fsm_newstate(fi, CTC_STATE_RXERR); 809 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 810 } else { 811 fsm_newstate(fi, CTC_STATE_TXERR); 812 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 813 } 814 } 815 816 /* 817 * Restart a channel after an error. 818 * 819 * fi An instance of a channel statemachine. 820 * event The event, just happened. 821 * arg Generic pointer, casted from channel * upon call. 822 */ 823 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) 824 __context_unsafe(/* Conditional locking */) 825 { 826 struct channel *ch = arg; 827 struct net_device *dev = ch->netdev; 828 unsigned long saveflags = 0; 829 int oldstate; 830 int rc; 831 832 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 833 "%s: %s[%d] of %s\n", 834 CTCM_FUNTAIL, ch->id, event, dev->name); 835 836 fsm_deltimer(&ch->timer); 837 838 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 839 oldstate = fsm_getstate(fi); 840 fsm_newstate(fi, CTC_STATE_STARTWAIT); 841 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 842 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 843 rc = ccw_device_halt(ch->cdev, 0); 844 if (event == CTC_EVENT_TIMER) 845 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 846 if (rc != 0) { 847 if (rc != -EBUSY) { 848 fsm_deltimer(&ch->timer); 849 fsm_newstate(fi, oldstate); 850 } 851 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); 852 } 853 } 854 855 /* 856 * Handle error during RX initial handshake (exchange of 857 * 0-length block header) 858 * 859 * fi An instance of a channel statemachine. 860 * event The event, just happened. 861 * arg Generic pointer, casted from channel * upon call. 862 */ 863 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) 864 { 865 struct channel *ch = arg; 866 struct net_device *dev = ch->netdev; 867 struct ctcm_priv *priv = dev->ml_priv; 868 869 if (event == CTC_EVENT_TIMER) { 870 if (!IS_MPCDEV(dev)) 871 /* TODO : check if MPC deletes timer somewhere */ 872 fsm_deltimer(&ch->timer); 873 if (ch->retry++ < 3) 874 ctcm_chx_restart(fi, event, arg); 875 else { 876 fsm_newstate(fi, CTC_STATE_RXERR); 877 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 878 } 879 } else if (event == CTC_EVENT_UC_RCRESET) { 880 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 881 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 882 ctc_ch_event_names[event], fsm_getstate_str(fi)); 883 884 dev_info(&dev->dev, 885 "Init handshake not received, peer not ready yet\n"); 886 } else { 887 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 888 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 889 ctc_ch_event_names[event], fsm_getstate_str(fi)); 890 891 dev_warn(&dev->dev, 892 "Initialization failed with RX/TX init handshake " 893 "error %s\n", ctc_ch_event_names[event]); 894 } 895 } 896 897 /* 898 * Notify device statemachine if we gave up initialization 899 * of RX channel. 900 * 901 * fi An instance of a channel statemachine. 902 * event The event, just happened. 903 * arg Generic pointer, casted from channel * upon call. 904 */ 905 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) 906 { 907 struct channel *ch = arg; 908 struct net_device *dev = ch->netdev; 909 struct ctcm_priv *priv = dev->ml_priv; 910 911 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 912 "%s(%s): RX %s busy, init. fail", 913 CTCM_FUNTAIL, dev->name, ch->id); 914 fsm_newstate(fi, CTC_STATE_RXERR); 915 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 916 } 917 918 /* 919 * Handle RX Unit check remote reset (remote disconnected) 920 * 921 * fi An instance of a channel statemachine. 922 * event The event, just happened. 923 * arg Generic pointer, casted from channel * upon call. 924 */ 925 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) 926 { 927 struct channel *ch = arg; 928 struct channel *ch2; 929 struct net_device *dev = ch->netdev; 930 struct ctcm_priv *priv = dev->ml_priv; 931 932 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 933 "%s: %s: remote disconnect - re-init ...", 934 CTCM_FUNTAIL, dev->name); 935 fsm_deltimer(&ch->timer); 936 /* 937 * Notify device statemachine 938 */ 939 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 940 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 941 942 fsm_newstate(fi, CTC_STATE_DTERM); 943 ch2 = priv->channel[CTCM_WRITE]; 944 fsm_newstate(ch2->fsm, CTC_STATE_DTERM); 945 946 ccw_device_halt(ch->cdev, 0); 947 ccw_device_halt(ch2->cdev, 0); 948 } 949 950 /* 951 * Handle error during TX channel initialization. 952 * 953 * fi An instance of a channel statemachine. 954 * event The event, just happened. 955 * arg Generic pointer, casted from channel * upon call. 956 */ 957 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) 958 { 959 struct channel *ch = arg; 960 struct net_device *dev = ch->netdev; 961 struct ctcm_priv *priv = dev->ml_priv; 962 963 if (event == CTC_EVENT_TIMER) { 964 fsm_deltimer(&ch->timer); 965 if (ch->retry++ < 3) 966 ctcm_chx_restart(fi, event, arg); 967 else { 968 fsm_newstate(fi, CTC_STATE_TXERR); 969 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 970 } 971 } else if (event == CTC_EVENT_UC_RCRESET) { 972 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 973 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 974 ctc_ch_event_names[event], fsm_getstate_str(fi)); 975 976 dev_info(&dev->dev, 977 "Init handshake not sent, peer not ready yet\n"); 978 } else { 979 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 980 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 981 ctc_ch_event_names[event], fsm_getstate_str(fi)); 982 983 dev_warn(&dev->dev, 984 "Initialization failed with RX/TX init handshake " 985 "error %s\n", ctc_ch_event_names[event]); 986 } 987 } 988 989 /* 990 * Handle TX timeout by retrying operation. 991 * 992 * fi An instance of a channel statemachine. 993 * event The event, just happened. 994 * arg Generic pointer, casted from channel * upon call. 995 */ 996 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) 997 __context_unsafe(/* Conditional locking */) 998 { 999 struct channel *ch = arg; 1000 struct net_device *dev = ch->netdev; 1001 struct ctcm_priv *priv = dev->ml_priv; 1002 struct sk_buff *skb; 1003 1004 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", 1005 __func__, smp_processor_id(), ch, ch->id); 1006 1007 fsm_deltimer(&ch->timer); 1008 if (ch->retry++ > 3) { 1009 struct mpc_group *gptr = priv->mpcg; 1010 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1011 "%s: %s: retries exceeded", 1012 CTCM_FUNTAIL, ch->id); 1013 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1014 /* call restart if not MPC or if MPC and mpcg fsm is ready. 1015 use gptr as mpc indicator */ 1016 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) 1017 ctcm_chx_restart(fi, event, arg); 1018 goto done; 1019 } 1020 1021 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1022 "%s : %s: retry %d", 1023 CTCM_FUNTAIL, ch->id, ch->retry); 1024 skb = skb_peek(&ch->io_queue); 1025 if (skb) { 1026 int rc = 0; 1027 unsigned long saveflags = 0; 1028 clear_normalized_cda(&ch->ccw[4]); 1029 ch->ccw[4].count = skb->len; 1030 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 1031 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1032 "%s: %s: IDAL alloc failed", 1033 CTCM_FUNTAIL, ch->id); 1034 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1035 ctcm_chx_restart(fi, event, arg); 1036 goto done; 1037 } 1038 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 1039 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ 1040 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1041 if (do_debug_ccw) 1042 ctcmpc_dumpit((char *)&ch->ccw[3], 1043 sizeof(struct ccw1) * 3); 1044 1045 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 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 1313 header = skb_push(ch->trans_skb, TH_HEADER_LENGTH); 1314 memset(header, 0, TH_HEADER_LENGTH); 1315 1316 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 1317 ch->th_seq_num++; 1318 header->th_seq_num = ch->th_seq_num; 1319 1320 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , 1321 __func__, ch->th_seq_num); 1322 1323 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1324 __func__, ch->trans_skb->len); 1325 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " 1326 "data to vtam from collect_q\n", __func__); 1327 CTCM_D3_DUMP((char *)ch->trans_skb->data, 1328 min_t(int, ch->trans_skb->len, 50)); 1329 1330 spin_unlock(&ch->collect_lock); 1331 clear_normalized_cda(&ch->ccw[1]); 1332 1333 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1334 (void *)(u64)dma32_to_u32(ch->ccw[1].cda), 1335 ch->trans_skb->data); 1336 ch->ccw[1].count = ch->max_bufsize; 1337 1338 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 1339 dev_kfree_skb_any(ch->trans_skb); 1340 ch->trans_skb = NULL; 1341 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 1342 "%s: %s: IDAL alloc failed", 1343 CTCM_FUNTAIL, ch->id); 1344 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1345 return; 1346 } 1347 1348 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1349 (void *)(u64)dma32_to_u32(ch->ccw[1].cda), 1350 ch->trans_skb->data); 1351 1352 ch->ccw[1].count = ch->trans_skb->len; 1353 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 1354 ch->prof.send_stamp = jiffies; 1355 if (do_debug_ccw) 1356 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1357 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 1358 ch->prof.doios_multi++; 1359 if (rc != 0) { 1360 priv->stats.tx_dropped += i; 1361 priv->stats.tx_errors += i; 1362 fsm_deltimer(&ch->timer); 1363 ctcm_ccw_check_rc(ch, rc, "chained TX"); 1364 } 1365 done: 1366 ctcm_clear_busy(dev); 1367 return; 1368 } 1369 1370 /* 1371 * Got normal data, check for sanity, queue it up, allocate new buffer 1372 * trigger bottom half, and initiate next read. 1373 * 1374 * fi An instance of a channel statemachine. 1375 * event The event, just happened. 1376 * arg Generic pointer, casted from channel * upon call. 1377 */ 1378 static void ctcmpc_chx_rx(fsm_instance *fi, int event, void *arg) 1379 __context_unsafe(/* Conditional locking */) 1380 { 1381 struct channel *ch = arg; 1382 struct net_device *dev = ch->netdev; 1383 struct ctcm_priv *priv = dev->ml_priv; 1384 struct mpc_group *grp = priv->mpcg; 1385 struct sk_buff *skb = ch->trans_skb; 1386 struct sk_buff *new_skb; 1387 unsigned long saveflags = 0; /* avoids compiler warning */ 1388 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 1389 1390 CTCM_PR_DEBUG("%s: %s: cp:%i %s maxbuf : %04x, len: %04x\n", 1391 CTCM_FUNTAIL, dev->name, smp_processor_id(), 1392 ch->id, ch->max_bufsize, len); 1393 fsm_deltimer(&ch->timer); 1394 1395 if (skb == NULL) { 1396 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1397 "%s(%s): TRANS_SKB = NULL", 1398 CTCM_FUNTAIL, dev->name); 1399 goto again; 1400 } 1401 1402 if (len < TH_HEADER_LENGTH) { 1403 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1404 "%s(%s): packet length %d too short", 1405 CTCM_FUNTAIL, dev->name, len); 1406 priv->stats.rx_dropped++; 1407 priv->stats.rx_length_errors++; 1408 } else { 1409 /* must have valid th header or game over */ 1410 __u32 block_len = len; 1411 len = TH_HEADER_LENGTH + XID2_LENGTH + 4; 1412 new_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC); 1413 1414 if (new_skb == NULL) { 1415 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1416 "%s(%s): skb allocation failed", 1417 CTCM_FUNTAIL, dev->name); 1418 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1419 goto again; 1420 } 1421 switch (fsm_getstate(grp->fsm)) { 1422 case MPCG_STATE_RESET: 1423 case MPCG_STATE_INOP: 1424 dev_kfree_skb_any(new_skb); 1425 break; 1426 case MPCG_STATE_FLOWC: 1427 case MPCG_STATE_READY: 1428 skb_put_data(new_skb, skb->data, block_len); 1429 skb_queue_tail(&ch->io_queue, new_skb); 1430 tasklet_schedule(&ch->ch_tasklet); 1431 break; 1432 default: 1433 skb_put_data(new_skb, skb->data, len); 1434 skb_queue_tail(&ch->io_queue, new_skb); 1435 tasklet_hi_schedule(&ch->ch_tasklet); 1436 break; 1437 } 1438 } 1439 1440 again: 1441 switch (fsm_getstate(grp->fsm)) { 1442 int rc, dolock; 1443 case MPCG_STATE_FLOWC: 1444 case MPCG_STATE_READY: 1445 if (ctcm_checkalloc_buffer(ch)) 1446 break; 1447 ch->trans_skb->data = ch->trans_skb_data; 1448 skb_reset_tail_pointer(ch->trans_skb); 1449 ch->trans_skb->len = 0; 1450 ch->ccw[1].count = ch->max_bufsize; 1451 if (do_debug_ccw) 1452 ctcmpc_dumpit((char *)&ch->ccw[0], 1453 sizeof(struct ccw1) * 3); 1454 dolock = !in_hardirq(); 1455 if (dolock) 1456 spin_lock_irqsave( 1457 get_ccwdev_lock(ch->cdev), saveflags); 1458 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 1459 if (dolock) 1460 spin_unlock_irqrestore( 1461 get_ccwdev_lock(ch->cdev), saveflags); 1462 if (rc != 0) 1463 ctcm_ccw_check_rc(ch, rc, "normal RX"); 1464 break; 1465 default: 1466 break; 1467 } 1468 1469 CTCM_PR_DEBUG("Exit %s: %s, ch=0x%p, id=%s\n", 1470 __func__, dev->name, ch, ch->id); 1471 1472 } 1473 1474 /* 1475 * Initialize connection by sending a __u16 of value 0. 1476 * 1477 * fi An instance of a channel statemachine. 1478 * event The event, just happened. 1479 * arg Generic pointer, casted from channel * upon call. 1480 */ 1481 static void ctcmpc_chx_firstio(fsm_instance *fi, int event, void *arg) 1482 { 1483 struct channel *ch = arg; 1484 struct net_device *dev = ch->netdev; 1485 struct ctcm_priv *priv = dev->ml_priv; 1486 struct mpc_group *gptr = priv->mpcg; 1487 1488 CTCM_PR_DEBUG("Enter %s: id=%s, ch=0x%p\n", 1489 __func__, ch->id, ch); 1490 1491 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1492 "%s: %s: chstate:%i, grpstate:%i, prot:%i\n", 1493 CTCM_FUNTAIL, ch->id, fsm_getstate(fi), 1494 fsm_getstate(gptr->fsm), ch->protocol); 1495 1496 if (fsm_getstate(fi) == CTC_STATE_TXIDLE) 1497 MPC_DBF_DEV_NAME(TRACE, dev, "remote side issued READ? "); 1498 1499 fsm_deltimer(&ch->timer); 1500 if (ctcm_checkalloc_buffer(ch)) 1501 goto done; 1502 1503 switch (fsm_getstate(fi)) { 1504 case CTC_STATE_STARTRETRY: 1505 case CTC_STATE_SETUPWAIT: 1506 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 1507 ctcmpc_chx_rxidle(fi, event, arg); 1508 } else { 1509 fsm_newstate(fi, CTC_STATE_TXIDLE); 1510 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 1511 } 1512 goto done; 1513 default: 1514 break; 1515 } 1516 1517 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 1518 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 1519 1520 done: 1521 CTCM_PR_DEBUG("Exit %s: id=%s, ch=0x%p\n", 1522 __func__, ch->id, ch); 1523 return; 1524 } 1525 1526 /* 1527 * Got initial data, check it. If OK, 1528 * notify device statemachine that we are up and 1529 * running. 1530 * 1531 * fi An instance of a channel statemachine. 1532 * event The event, just happened. 1533 * arg Generic pointer, casted from channel * upon call. 1534 */ 1535 void ctcmpc_chx_rxidle(fsm_instance *fi, int event, void *arg) 1536 __context_unsafe(/* Conditional locking */) 1537 { 1538 struct channel *ch = arg; 1539 struct net_device *dev = ch->netdev; 1540 struct ctcm_priv *priv = dev->ml_priv; 1541 struct mpc_group *grp = priv->mpcg; 1542 int rc; 1543 unsigned long saveflags = 0; /* avoids compiler warning */ 1544 1545 fsm_deltimer(&ch->timer); 1546 CTCM_PR_DEBUG("%s: %s: %s: cp:%i, chstate:%i grpstate:%i\n", 1547 __func__, ch->id, dev->name, smp_processor_id(), 1548 fsm_getstate(fi), fsm_getstate(grp->fsm)); 1549 1550 fsm_newstate(fi, CTC_STATE_RXIDLE); 1551 /* XID processing complete */ 1552 1553 switch (fsm_getstate(grp->fsm)) { 1554 case MPCG_STATE_FLOWC: 1555 case MPCG_STATE_READY: 1556 if (ctcm_checkalloc_buffer(ch)) 1557 goto done; 1558 ch->trans_skb->data = ch->trans_skb_data; 1559 skb_reset_tail_pointer(ch->trans_skb); 1560 ch->trans_skb->len = 0; 1561 ch->ccw[1].count = ch->max_bufsize; 1562 CTCM_CCW_DUMP((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1563 if (event == CTC_EVENT_START) 1564 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1565 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 1566 if (event == CTC_EVENT_START) 1567 spin_unlock_irqrestore( 1568 get_ccwdev_lock(ch->cdev), saveflags); 1569 if (rc != 0) { 1570 fsm_newstate(fi, CTC_STATE_RXINIT); 1571 ctcm_ccw_check_rc(ch, rc, "initial RX"); 1572 goto done; 1573 } 1574 break; 1575 default: 1576 break; 1577 } 1578 1579 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 1580 done: 1581 return; 1582 } 1583 1584 /* 1585 * ctcmpc channel FSM action 1586 * called from several points in ctcmpc_ch_fsm 1587 * ctcmpc only 1588 */ 1589 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg) 1590 { 1591 struct channel *ch = arg; 1592 struct net_device *dev = ch->netdev; 1593 struct ctcm_priv *priv = dev->ml_priv; 1594 struct mpc_group *grp = priv->mpcg; 1595 1596 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n", 1597 __func__, dev->name, ch->id, ch, smp_processor_id(), 1598 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1599 1600 switch (fsm_getstate(grp->fsm)) { 1601 case MPCG_STATE_XID2INITW: 1602 /* ok..start yside xid exchanges */ 1603 if (!ch->in_mpcgroup) 1604 break; 1605 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) { 1606 fsm_deltimer(&grp->timer); 1607 fsm_addtimer(&grp->timer, 1608 MPC_XID_TIMEOUT_VALUE, 1609 MPCG_EVENT_TIMER, dev); 1610 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1611 1612 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1613 /* attn rcvd before xid0 processed via bh */ 1614 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1615 break; 1616 case MPCG_STATE_XID2INITX: 1617 case MPCG_STATE_XID0IOWAIT: 1618 case MPCG_STATE_XID0IOWAIX: 1619 /* attn rcvd before xid0 processed on ch 1620 but mid-xid0 processing for group */ 1621 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1622 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1623 break; 1624 case MPCG_STATE_XID7INITW: 1625 case MPCG_STATE_XID7INITX: 1626 case MPCG_STATE_XID7INITI: 1627 case MPCG_STATE_XID7INITZ: 1628 switch (fsm_getstate(ch->fsm)) { 1629 case CH_XID7_PENDING: 1630 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1631 break; 1632 case CH_XID7_PENDING2: 1633 fsm_newstate(ch->fsm, CH_XID7_PENDING3); 1634 break; 1635 } 1636 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 1637 break; 1638 } 1639 1640 return; 1641 } 1642 1643 /* 1644 * ctcmpc channel FSM action 1645 * called from one point in ctcmpc_ch_fsm 1646 * ctcmpc only 1647 */ 1648 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg) 1649 { 1650 struct channel *ch = arg; 1651 struct net_device *dev = ch->netdev; 1652 struct ctcm_priv *priv = dev->ml_priv; 1653 struct mpc_group *grp = priv->mpcg; 1654 1655 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n", 1656 __func__, dev->name, ch->id, 1657 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1658 1659 fsm_deltimer(&ch->timer); 1660 1661 switch (fsm_getstate(grp->fsm)) { 1662 case MPCG_STATE_XID0IOWAIT: 1663 /* vtam wants to be primary.start yside xid exchanges*/ 1664 /* only receive one attn-busy at a time so must not */ 1665 /* change state each time */ 1666 grp->changed_side = 1; 1667 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1668 break; 1669 case MPCG_STATE_XID2INITW: 1670 if (grp->changed_side == 1) { 1671 grp->changed_side = 2; 1672 break; 1673 } 1674 /* process began via call to establish_conn */ 1675 /* so must report failure instead of reverting */ 1676 /* back to ready-for-xid passive state */ 1677 if (grp->estconnfunc) 1678 goto done; 1679 /* this attnbusy is NOT the result of xside xid */ 1680 /* collisions so yside must have been triggered */ 1681 /* by an ATTN that was not intended to start XID */ 1682 /* processing. Revert back to ready-for-xid and */ 1683 /* wait for ATTN interrupt to signal xid start */ 1684 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) { 1685 fsm_newstate(ch->fsm, CH_XID0_PENDING) ; 1686 fsm_deltimer(&grp->timer); 1687 goto done; 1688 } 1689 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1690 goto done; 1691 case MPCG_STATE_XID2INITX: 1692 /* XID2 was received before ATTN Busy for second 1693 channel.Send yside xid for second channel. 1694 */ 1695 if (grp->changed_side == 1) { 1696 grp->changed_side = 2; 1697 break; 1698 } 1699 fallthrough; 1700 case MPCG_STATE_XID0IOWAIX: 1701 case MPCG_STATE_XID7INITW: 1702 case MPCG_STATE_XID7INITX: 1703 case MPCG_STATE_XID7INITI: 1704 case MPCG_STATE_XID7INITZ: 1705 default: 1706 /* multiple attn-busy indicates too out-of-sync */ 1707 /* and they are certainly not being received as part */ 1708 /* of valid mpc group negotiations.. */ 1709 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1710 goto done; 1711 } 1712 1713 if (grp->changed_side == 1) { 1714 fsm_deltimer(&grp->timer); 1715 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 1716 MPCG_EVENT_TIMER, dev); 1717 } 1718 if (ch->in_mpcgroup) 1719 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1720 else 1721 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1722 "%s(%s): channel %s not added to group", 1723 CTCM_FUNTAIL, dev->name, ch->id); 1724 1725 done: 1726 return; 1727 } 1728 1729 /* 1730 * ctcmpc channel FSM action 1731 * called from several points in ctcmpc_ch_fsm 1732 * ctcmpc only 1733 */ 1734 static void ctcmpc_chx_resend(fsm_instance *fsm, int event, void *arg) 1735 { 1736 struct channel *ch = arg; 1737 struct net_device *dev = ch->netdev; 1738 struct ctcm_priv *priv = dev->ml_priv; 1739 struct mpc_group *grp = priv->mpcg; 1740 1741 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1742 return; 1743 } 1744 1745 /* 1746 * ctcmpc channel FSM action 1747 * called from several points in ctcmpc_ch_fsm 1748 * ctcmpc only 1749 */ 1750 static void ctcmpc_chx_send_sweep(fsm_instance *fsm, int event, void *arg) 1751 { 1752 struct channel *ach = arg; 1753 struct net_device *dev = ach->netdev; 1754 struct ctcm_priv *priv = dev->ml_priv; 1755 struct mpc_group *grp = priv->mpcg; 1756 struct channel *wch = priv->channel[CTCM_WRITE]; 1757 struct channel *rch = priv->channel[CTCM_READ]; 1758 struct sk_buff *skb; 1759 struct th_sweep *header; 1760 int rc = 0; 1761 unsigned long saveflags = 0; 1762 1763 CTCM_PR_DEBUG("ctcmpc enter: %s(): cp=%i ch=0x%p id=%s\n", 1764 __func__, smp_processor_id(), ach, ach->id); 1765 1766 if (grp->in_sweep == 0) 1767 goto done; 1768 1769 CTCM_PR_DBGDATA("%s: 1: ToVTAM_th_seq= %08x\n" , 1770 __func__, wch->th_seq_num); 1771 CTCM_PR_DBGDATA("%s: 1: FromVTAM_th_seq= %08x\n" , 1772 __func__, rch->th_seq_num); 1773 1774 if (fsm_getstate(wch->fsm) != CTC_STATE_TXIDLE) { 1775 /* give the previous IO time to complete */ 1776 fsm_addtimer(&wch->sweep_timer, 1777 200, CTC_EVENT_RSWEEP_TIMER, wch); 1778 goto done; 1779 } 1780 1781 skb = skb_dequeue(&wch->sweep_queue); 1782 if (!skb) 1783 goto done; 1784 1785 if (set_normalized_cda(&wch->ccw[4], skb->data)) { 1786 grp->in_sweep = 0; 1787 ctcm_clear_busy_do(dev); 1788 dev_kfree_skb_any(skb); 1789 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1790 goto done; 1791 } else { 1792 refcount_inc(&skb->users); 1793 skb_queue_tail(&wch->io_queue, skb); 1794 } 1795 1796 /* send out the sweep */ 1797 wch->ccw[4].count = skb->len; 1798 1799 header = (struct th_sweep *)skb->data; 1800 switch (header->th.th_ch_flag) { 1801 case TH_SWEEP_REQ: 1802 grp->sweep_req_pend_num--; 1803 break; 1804 case TH_SWEEP_RESP: 1805 grp->sweep_rsp_pend_num--; 1806 break; 1807 } 1808 1809 header->sw.th_last_seq = wch->th_seq_num; 1810 1811 CTCM_CCW_DUMP((char *)&wch->ccw[3], sizeof(struct ccw1) * 3); 1812 CTCM_PR_DBGDATA("%s: sweep packet\n", __func__); 1813 CTCM_D3_DUMP((char *)header, TH_SWEEP_LENGTH); 1814 1815 fsm_addtimer(&wch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, wch); 1816 fsm_newstate(wch->fsm, CTC_STATE_TX); 1817 1818 spin_lock_irqsave(get_ccwdev_lock(wch->cdev), saveflags); 1819 wch->prof.send_stamp = jiffies; 1820 rc = ccw_device_start(wch->cdev, &wch->ccw[3], 0, 0xff, 0); 1821 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags); 1822 1823 if ((grp->sweep_req_pend_num == 0) && 1824 (grp->sweep_rsp_pend_num == 0)) { 1825 grp->in_sweep = 0; 1826 rch->th_seq_num = 0x00; 1827 wch->th_seq_num = 0x00; 1828 ctcm_clear_busy_do(dev); 1829 } 1830 1831 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" , 1832 __func__, wch->th_seq_num, rch->th_seq_num); 1833 1834 if (rc != 0) 1835 ctcm_ccw_check_rc(wch, rc, "send sweep"); 1836 1837 done: 1838 return; 1839 } 1840 1841 1842 /* 1843 * The ctcmpc statemachine for a channel. 1844 */ 1845 1846 const fsm_node ctcmpc_ch_fsm[] = { 1847 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1848 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1849 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1850 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1851 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1852 1853 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1854 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1855 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1856 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1857 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1858 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop }, 1859 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop }, 1860 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1861 1862 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1863 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1864 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1865 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1866 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1867 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1868 1869 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1870 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1871 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1872 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1873 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1874 1875 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1876 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1877 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 1878 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1879 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1880 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1881 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1882 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1883 1884 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1885 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1886 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle }, 1887 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1888 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1889 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1890 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1891 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1892 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio }, 1893 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1894 1895 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1896 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1897 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1898 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1899 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1900 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1901 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1902 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1903 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1904 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1905 1906 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1907 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1908 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio }, 1909 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop }, 1910 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1911 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1912 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1913 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1914 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy }, 1915 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1916 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1917 1918 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1919 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1920 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1921 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1922 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1923 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1924 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1925 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1926 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1927 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1928 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1929 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1930 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1931 1932 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1933 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1934 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio }, 1935 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop }, 1936 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1937 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1938 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1939 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1940 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1941 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1942 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1943 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1944 1945 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1946 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1947 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio }, 1948 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop }, 1949 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1950 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1951 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1952 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1953 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1954 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1955 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1956 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1957 1958 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1959 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1960 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio }, 1961 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop }, 1962 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1963 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1964 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1965 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1966 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1967 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1968 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1969 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1970 1971 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1972 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1973 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio }, 1974 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop }, 1975 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1976 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1977 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1978 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1979 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1980 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1981 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1982 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1983 1984 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1985 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1986 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1987 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1988 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 1989 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1990 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1991 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1992 1993 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1994 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 1995 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 1996 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 1997 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 1998 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 1999 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2000 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2001 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2002 2003 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 2004 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 2005 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 2006 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2007 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2008 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2009 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2010 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2011 2012 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 2013 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 2014 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 2015 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2016 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2017 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2018 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2019 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2020 2021 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 2022 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 2023 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 2024 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2025 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2026 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2027 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2028 2029 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 2030 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 2031 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone }, 2032 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2033 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2034 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 2035 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2036 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2037 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2038 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2039 2040 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2041 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2042 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2043 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2044 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2045 }; 2046 2047 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm); 2048 2049 /* 2050 * Actions for interface - statemachine. 2051 */ 2052 2053 /* 2054 * Startup channels by sending CTC_EVENT_START to each channel. 2055 * 2056 * fi An instance of an interface statemachine. 2057 * event The event, just happened. 2058 * arg Generic pointer, casted from struct net_device * upon call. 2059 */ 2060 static void dev_action_start(fsm_instance *fi, int event, void *arg) 2061 { 2062 struct net_device *dev = arg; 2063 struct ctcm_priv *priv = dev->ml_priv; 2064 int direction; 2065 2066 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2067 2068 fsm_deltimer(&priv->restart_timer); 2069 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2070 if (IS_MPC(priv)) 2071 priv->mpcg->channels_terminating = 0; 2072 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 2073 struct channel *ch = priv->channel[direction]; 2074 fsm_event(ch->fsm, CTC_EVENT_START, ch); 2075 } 2076 } 2077 2078 /* 2079 * Shutdown channels by sending CTC_EVENT_STOP to each channel. 2080 * 2081 * fi An instance of an interface statemachine. 2082 * event The event, just happened. 2083 * arg Generic pointer, casted from struct net_device * upon call. 2084 */ 2085 static void dev_action_stop(fsm_instance *fi, int event, void *arg) 2086 { 2087 int direction; 2088 struct net_device *dev = arg; 2089 struct ctcm_priv *priv = dev->ml_priv; 2090 2091 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2092 2093 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2094 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 2095 struct channel *ch = priv->channel[direction]; 2096 fsm_event(ch->fsm, CTC_EVENT_STOP, ch); 2097 ch->th_seq_num = 0x00; 2098 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n", 2099 __func__, ch->th_seq_num); 2100 } 2101 if (IS_MPC(priv)) 2102 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2103 } 2104 2105 static void dev_action_restart(fsm_instance *fi, int event, void *arg) 2106 { 2107 int restart_timer; 2108 struct net_device *dev = arg; 2109 struct ctcm_priv *priv = dev->ml_priv; 2110 2111 CTCMY_DBF_DEV_NAME(TRACE, dev, ""); 2112 2113 if (IS_MPC(priv)) { 2114 restart_timer = CTCM_TIME_1_SEC; 2115 } else { 2116 restart_timer = CTCM_TIME_5_SEC; 2117 } 2118 dev_info(&dev->dev, "Restarting device\n"); 2119 2120 dev_action_stop(fi, event, arg); 2121 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 2122 if (IS_MPC(priv)) 2123 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2124 2125 /* going back into start sequence too quickly can */ 2126 /* result in the other side becoming unreachable due */ 2127 /* to sense reported when IO is aborted */ 2128 fsm_addtimer(&priv->restart_timer, restart_timer, 2129 DEV_EVENT_START, dev); 2130 } 2131 2132 /* 2133 * Called from channel statemachine 2134 * when a channel is up and running. 2135 * 2136 * fi An instance of an interface statemachine. 2137 * event The event, just happened. 2138 * arg Generic pointer, casted from struct net_device * upon call. 2139 */ 2140 static void dev_action_chup(fsm_instance *fi, int event, void *arg) 2141 { 2142 struct net_device *dev = arg; 2143 struct ctcm_priv *priv = dev->ml_priv; 2144 int dev_stat = fsm_getstate(fi); 2145 2146 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 2147 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL, 2148 dev->name, dev->ml_priv, dev_stat, event); 2149 2150 switch (fsm_getstate(fi)) { 2151 case DEV_STATE_STARTWAIT_RXTX: 2152 if (event == DEV_EVENT_RXUP) 2153 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2154 else 2155 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2156 break; 2157 case DEV_STATE_STARTWAIT_RX: 2158 if (event == DEV_EVENT_RXUP) { 2159 fsm_newstate(fi, DEV_STATE_RUNNING); 2160 dev_info(&dev->dev, 2161 "Connected with remote side\n"); 2162 ctcm_clear_busy(dev); 2163 } 2164 break; 2165 case DEV_STATE_STARTWAIT_TX: 2166 if (event == DEV_EVENT_TXUP) { 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_STOPWAIT_TX: 2174 if (event == DEV_EVENT_RXUP) 2175 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2176 break; 2177 case DEV_STATE_STOPWAIT_RX: 2178 if (event == DEV_EVENT_TXUP) 2179 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2180 break; 2181 } 2182 2183 if (IS_MPC(priv)) { 2184 if (event == DEV_EVENT_RXUP) 2185 mpc_channel_action(priv->channel[CTCM_READ], 2186 CTCM_READ, MPC_CHANNEL_ADD); 2187 else 2188 mpc_channel_action(priv->channel[CTCM_WRITE], 2189 CTCM_WRITE, MPC_CHANNEL_ADD); 2190 } 2191 } 2192 2193 /* 2194 * Called from device statemachine 2195 * when a channel has been shutdown. 2196 * 2197 * fi An instance of an interface statemachine. 2198 * event The event, just happened. 2199 * arg Generic pointer, casted from struct net_device * upon call. 2200 */ 2201 static void dev_action_chdown(fsm_instance *fi, int event, void *arg) 2202 { 2203 2204 struct net_device *dev = arg; 2205 struct ctcm_priv *priv = dev->ml_priv; 2206 2207 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2208 2209 switch (fsm_getstate(fi)) { 2210 case DEV_STATE_RUNNING: 2211 if (event == DEV_EVENT_TXDOWN) 2212 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2213 else 2214 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2215 break; 2216 case DEV_STATE_STARTWAIT_RX: 2217 if (event == DEV_EVENT_TXDOWN) 2218 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2219 break; 2220 case DEV_STATE_STARTWAIT_TX: 2221 if (event == DEV_EVENT_RXDOWN) 2222 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2223 break; 2224 case DEV_STATE_STOPWAIT_RXTX: 2225 if (event == DEV_EVENT_TXDOWN) 2226 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); 2227 else 2228 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); 2229 break; 2230 case DEV_STATE_STOPWAIT_RX: 2231 if (event == DEV_EVENT_RXDOWN) 2232 fsm_newstate(fi, DEV_STATE_STOPPED); 2233 break; 2234 case DEV_STATE_STOPWAIT_TX: 2235 if (event == DEV_EVENT_TXDOWN) 2236 fsm_newstate(fi, DEV_STATE_STOPPED); 2237 break; 2238 } 2239 if (IS_MPC(priv)) { 2240 if (event == DEV_EVENT_RXDOWN) 2241 mpc_channel_action(priv->channel[CTCM_READ], 2242 CTCM_READ, MPC_CHANNEL_REMOVE); 2243 else 2244 mpc_channel_action(priv->channel[CTCM_WRITE], 2245 CTCM_WRITE, MPC_CHANNEL_REMOVE); 2246 } 2247 } 2248 2249 const fsm_node dev_fsm[] = { 2250 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, 2251 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, 2252 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2253 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2254 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2255 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, 2256 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2257 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2258 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2259 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2260 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, 2261 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2262 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2263 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2264 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2265 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, 2266 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, 2267 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, 2268 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2269 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2270 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2271 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, 2272 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2273 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2274 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2275 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2276 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, 2277 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2278 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2279 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2280 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2281 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, 2282 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, 2283 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, 2284 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop }, 2285 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop }, 2286 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, 2287 }; 2288 2289 int dev_fsm_len = ARRAY_SIZE(dev_fsm); 2290 2291 /* --- This is the END my friend --- */ 2292 2293