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], 0, 0xff, 0); 311 ch->prof.doios_multi++; 312 if (rc != 0) { 313 priv->stats.tx_dropped += i; 314 priv->stats.tx_errors += i; 315 fsm_deltimer(&ch->timer); 316 ctcm_ccw_check_rc(ch, rc, "chained TX"); 317 } 318 } else { 319 spin_unlock(&ch->collect_lock); 320 fsm_newstate(fi, CTC_STATE_TXIDLE); 321 } 322 ctcm_clear_busy_do(dev); 323 } 324 325 /* 326 * Initial data is sent. 327 * Notify device statemachine that we are up and 328 * running. 329 * 330 * fi An instance of a channel statemachine. 331 * event The event, just happened. 332 * arg Generic pointer, casted from channel * upon call. 333 */ 334 void ctcm_chx_txidle(fsm_instance *fi, int event, void *arg) 335 { 336 struct channel *ch = arg; 337 struct net_device *dev = ch->netdev; 338 struct ctcm_priv *priv = dev->ml_priv; 339 340 CTCM_PR_DEBUG("%s(%s): %s\n", __func__, ch->id, dev->name); 341 342 fsm_deltimer(&ch->timer); 343 fsm_newstate(fi, CTC_STATE_TXIDLE); 344 fsm_event(priv->fsm, DEV_EVENT_TXUP, ch->netdev); 345 } 346 347 /* 348 * Got normal data, check for sanity, queue it up, allocate new buffer 349 * trigger bottom half, and initiate next read. 350 * 351 * fi An instance of a channel statemachine. 352 * event The event, just happened. 353 * arg Generic pointer, casted from channel * upon call. 354 */ 355 static void chx_rx(fsm_instance *fi, int event, void *arg) 356 { 357 struct channel *ch = arg; 358 struct net_device *dev = ch->netdev; 359 struct ctcm_priv *priv = dev->ml_priv; 360 int len = ch->max_bufsize - ch->irb->scsw.cmd.count; 361 struct sk_buff *skb = ch->trans_skb; 362 __u16 block_len = *((__u16 *)skb->data); 363 int check_len; 364 int rc; 365 366 fsm_deltimer(&ch->timer); 367 if (len < 8) { 368 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 369 "%s(%s): got packet with length %d < 8\n", 370 CTCM_FUNTAIL, dev->name, len); 371 priv->stats.rx_dropped++; 372 priv->stats.rx_length_errors++; 373 goto again; 374 } 375 if (len > ch->max_bufsize) { 376 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 377 "%s(%s): got packet with length %d > %d\n", 378 CTCM_FUNTAIL, dev->name, len, ch->max_bufsize); 379 priv->stats.rx_dropped++; 380 priv->stats.rx_length_errors++; 381 goto again; 382 } 383 384 /* 385 * VM TCP seems to have a bug sending 2 trailing bytes of garbage. 386 */ 387 switch (ch->protocol) { 388 case CTCM_PROTO_S390: 389 case CTCM_PROTO_OS390: 390 check_len = block_len + 2; 391 break; 392 default: 393 check_len = block_len; 394 break; 395 } 396 if ((len < block_len) || (len > check_len)) { 397 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 398 "%s(%s): got block length %d != rx length %d\n", 399 CTCM_FUNTAIL, dev->name, block_len, len); 400 if (do_debug) 401 ctcmpc_dump_skb(skb, 0); 402 403 *((__u16 *)skb->data) = len; 404 priv->stats.rx_dropped++; 405 priv->stats.rx_length_errors++; 406 goto again; 407 } 408 if (block_len > 2) { 409 *((__u16 *)skb->data) = block_len - 2; 410 ctcm_unpack_skb(ch, skb); 411 } 412 again: 413 skb->data = ch->trans_skb_data; 414 skb_reset_tail_pointer(skb); 415 skb->len = 0; 416 if (ctcm_checkalloc_buffer(ch)) 417 return; 418 ch->ccw[1].count = ch->max_bufsize; 419 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 420 if (rc != 0) 421 ctcm_ccw_check_rc(ch, rc, "normal RX"); 422 } 423 424 /* 425 * Initialize connection by sending a __u16 of value 0. 426 * 427 * fi An instance of a channel statemachine. 428 * event The event, just happened. 429 * arg Generic pointer, casted from channel * upon call. 430 */ 431 static void chx_firstio(fsm_instance *fi, int event, void *arg) 432 { 433 int rc; 434 struct channel *ch = arg; 435 int fsmstate = fsm_getstate(fi); 436 437 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 438 "%s(%s) : %02x", 439 CTCM_FUNTAIL, ch->id, fsmstate); 440 441 ch->sense_rc = 0; /* reset unit check report control */ 442 if (fsmstate == CTC_STATE_TXIDLE) 443 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 444 "%s(%s): remote side issued READ?, init.\n", 445 CTCM_FUNTAIL, ch->id); 446 fsm_deltimer(&ch->timer); 447 if (ctcm_checkalloc_buffer(ch)) 448 return; 449 if ((fsmstate == CTC_STATE_SETUPWAIT) && 450 (ch->protocol == CTCM_PROTO_OS390)) { 451 /* OS/390 resp. z/OS */ 452 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 453 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 454 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, 455 CTC_EVENT_TIMER, ch); 456 chx_rxidle(fi, event, arg); 457 } else { 458 struct net_device *dev = ch->netdev; 459 struct ctcm_priv *priv = dev->ml_priv; 460 fsm_newstate(fi, CTC_STATE_TXIDLE); 461 fsm_event(priv->fsm, DEV_EVENT_TXUP, dev); 462 } 463 return; 464 } 465 /* 466 * Don't setup a timer for receiving the initial RX frame 467 * if in compatibility mode, since VM TCP delays the initial 468 * frame until it has some data to send. 469 */ 470 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) || 471 (ch->protocol != CTCM_PROTO_S390)) 472 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 473 474 *((__u16 *)ch->trans_skb->data) = CTCM_INITIAL_BLOCKLEN; 475 ch->ccw[1].count = 2; /* Transfer only length */ 476 477 fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 478 ? CTC_STATE_RXINIT : CTC_STATE_TXINIT); 479 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 480 if (rc != 0) { 481 fsm_deltimer(&ch->timer); 482 fsm_newstate(fi, CTC_STATE_SETUPWAIT); 483 ctcm_ccw_check_rc(ch, rc, "init IO"); 484 } 485 /* 486 * If in compatibility mode since we don't setup a timer, we 487 * also signal RX channel up immediately. This enables us 488 * to send packets early which in turn usually triggers some 489 * reply from VM TCP which brings up the RX channel to it's 490 * final state. 491 */ 492 if ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) && 493 (ch->protocol == CTCM_PROTO_S390)) { 494 struct net_device *dev = ch->netdev; 495 struct ctcm_priv *priv = dev->ml_priv; 496 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 497 } 498 } 499 500 /* 501 * Got initial data, check it. If OK, 502 * notify device statemachine that we are up and 503 * running. 504 * 505 * fi An instance of a channel statemachine. 506 * event The event, just happened. 507 * arg Generic pointer, casted from channel * upon call. 508 */ 509 static void chx_rxidle(fsm_instance *fi, int event, void *arg) 510 { 511 struct channel *ch = arg; 512 struct net_device *dev = ch->netdev; 513 struct ctcm_priv *priv = dev->ml_priv; 514 __u16 buflen; 515 int rc; 516 517 fsm_deltimer(&ch->timer); 518 buflen = *((__u16 *)ch->trans_skb->data); 519 CTCM_PR_DEBUG("%s: %s: Initial RX count = %d\n", 520 __func__, dev->name, buflen); 521 522 if (buflen >= CTCM_INITIAL_BLOCKLEN) { 523 if (ctcm_checkalloc_buffer(ch)) 524 return; 525 ch->ccw[1].count = ch->max_bufsize; 526 fsm_newstate(fi, CTC_STATE_RXIDLE); 527 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 528 if (rc != 0) { 529 fsm_newstate(fi, CTC_STATE_RXINIT); 530 ctcm_ccw_check_rc(ch, rc, "initial RX"); 531 } else 532 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 533 } else { 534 CTCM_PR_DEBUG("%s: %s: Initial RX count %d not %d\n", 535 __func__, dev->name, 536 buflen, CTCM_INITIAL_BLOCKLEN); 537 chx_firstio(fi, event, arg); 538 } 539 } 540 541 /* 542 * Set channel into extended mode. 543 * 544 * fi An instance of a channel statemachine. 545 * event The event, just happened. 546 * arg Generic pointer, casted from channel * upon call. 547 */ 548 static void ctcm_chx_setmode(fsm_instance *fi, int event, void *arg) 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 /* Such conditional locking is undeterministic in 568 * static view. => ignore sparse warnings here. */ 569 570 rc = ccw_device_start(ch->cdev, &ch->ccw[6], 0, 0xff, 0); 571 if (event == CTC_EVENT_TIMER) /* see above comments */ 572 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 573 if (rc != 0) { 574 fsm_deltimer(&ch->timer); 575 fsm_newstate(fi, CTC_STATE_STARTWAIT); 576 ctcm_ccw_check_rc(ch, rc, "set Mode"); 577 } else 578 ch->retry = 0; 579 } 580 581 /* 582 * Setup channel. 583 * 584 * fi An instance of a channel statemachine. 585 * event The event, just happened. 586 * arg Generic pointer, casted from channel * upon call. 587 */ 588 static void ctcm_chx_start(fsm_instance *fi, int event, void *arg) 589 { 590 struct channel *ch = arg; 591 unsigned long saveflags; 592 int rc; 593 594 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s): %s", 595 CTCM_FUNTAIL, ch->id, 596 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX"); 597 598 if (ch->trans_skb != NULL) { 599 clear_normalized_cda(&ch->ccw[1]); 600 dev_kfree_skb(ch->trans_skb); 601 ch->trans_skb = NULL; 602 } 603 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 604 ch->ccw[1].cmd_code = CCW_CMD_READ; 605 ch->ccw[1].flags = CCW_FLAG_SLI; 606 ch->ccw[1].count = 0; 607 } else { 608 ch->ccw[1].cmd_code = CCW_CMD_WRITE; 609 ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 610 ch->ccw[1].count = 0; 611 } 612 if (ctcm_checkalloc_buffer(ch)) { 613 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 614 "%s(%s): %s trans_skb alloc delayed " 615 "until first transfer", 616 CTCM_FUNTAIL, ch->id, 617 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? 618 "RX" : "TX"); 619 } 620 ch->ccw[0].cmd_code = CCW_CMD_PREPARE; 621 ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 622 ch->ccw[0].count = 0; 623 ch->ccw[0].cda = 0; 624 ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ 625 ch->ccw[2].flags = CCW_FLAG_SLI; 626 ch->ccw[2].count = 0; 627 ch->ccw[2].cda = 0; 628 memcpy(&ch->ccw[3], &ch->ccw[0], sizeof(struct ccw1) * 3); 629 ch->ccw[4].cda = 0; 630 ch->ccw[4].flags &= ~CCW_FLAG_IDA; 631 632 fsm_newstate(fi, CTC_STATE_STARTWAIT); 633 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 634 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 635 rc = ccw_device_halt(ch->cdev, 0); 636 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 637 if (rc != 0) { 638 if (rc != -EBUSY) 639 fsm_deltimer(&ch->timer); 640 ctcm_ccw_check_rc(ch, rc, "initial HaltIO"); 641 } 642 } 643 644 /* 645 * Shutdown a channel. 646 * 647 * fi An instance of a channel statemachine. 648 * event The event, just happened. 649 * arg Generic pointer, casted from channel * upon call. 650 */ 651 static void ctcm_chx_haltio(fsm_instance *fi, int event, void *arg) 652 { 653 struct channel *ch = arg; 654 unsigned long saveflags = 0; 655 int rc; 656 int oldstate; 657 658 fsm_deltimer(&ch->timer); 659 if (IS_MPC(ch)) 660 fsm_deltimer(&ch->sweep_timer); 661 662 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 663 664 if (event == CTC_EVENT_STOP) /* only for STOP not yet locked */ 665 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 666 /* Such conditional locking is undeterministic in 667 * static view. => ignore sparse warnings here. */ 668 oldstate = fsm_getstate(fi); 669 fsm_newstate(fi, CTC_STATE_TERM); 670 rc = ccw_device_halt(ch->cdev, 0); 671 672 if (event == CTC_EVENT_STOP) 673 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 674 /* see remark above about conditional locking */ 675 676 if (rc != 0 && rc != -EBUSY) { 677 fsm_deltimer(&ch->timer); 678 if (event != CTC_EVENT_STOP) { 679 fsm_newstate(fi, oldstate); 680 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 681 } 682 } 683 } 684 685 /* 686 * Cleanup helper for chx_fail and chx_stopped 687 * cleanup channels queue and notify interface statemachine. 688 * 689 * fi An instance of a channel statemachine. 690 * state The next state (depending on caller). 691 * ch The channel to operate on. 692 */ 693 static void ctcm_chx_cleanup(fsm_instance *fi, int state, 694 struct channel *ch) 695 { 696 struct net_device *dev = ch->netdev; 697 struct ctcm_priv *priv = dev->ml_priv; 698 699 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 700 "%s(%s): %s[%d]\n", 701 CTCM_FUNTAIL, dev->name, ch->id, state); 702 703 fsm_deltimer(&ch->timer); 704 if (IS_MPC(ch)) 705 fsm_deltimer(&ch->sweep_timer); 706 707 fsm_newstate(fi, state); 708 if (state == CTC_STATE_STOPPED && ch->trans_skb != NULL) { 709 clear_normalized_cda(&ch->ccw[1]); 710 dev_kfree_skb_any(ch->trans_skb); 711 ch->trans_skb = NULL; 712 } 713 714 ch->th_seg = 0x00; 715 ch->th_seq_num = 0x00; 716 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 717 skb_queue_purge(&ch->io_queue); 718 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 719 } else { 720 ctcm_purge_skb_queue(&ch->io_queue); 721 if (IS_MPC(ch)) 722 ctcm_purge_skb_queue(&ch->sweep_queue); 723 spin_lock(&ch->collect_lock); 724 ctcm_purge_skb_queue(&ch->collect_queue); 725 ch->collect_len = 0; 726 spin_unlock(&ch->collect_lock); 727 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 728 } 729 } 730 731 /* 732 * A channel has successfully been halted. 733 * Cleanup it's queue and notify interface statemachine. 734 * 735 * fi An instance of a channel statemachine. 736 * event The event, just happened. 737 * arg Generic pointer, casted from channel * upon call. 738 */ 739 static void ctcm_chx_stopped(fsm_instance *fi, int event, void *arg) 740 { 741 ctcm_chx_cleanup(fi, CTC_STATE_STOPPED, arg); 742 } 743 744 /* 745 * A stop command from device statemachine arrived and we are in 746 * not operational mode. Set state to stopped. 747 * 748 * fi An instance of a channel statemachine. 749 * event The event, just happened. 750 * arg Generic pointer, casted from channel * upon call. 751 */ 752 static void ctcm_chx_stop(fsm_instance *fi, int event, void *arg) 753 { 754 fsm_newstate(fi, CTC_STATE_STOPPED); 755 } 756 757 /* 758 * A machine check for no path, not operational status or gone device has 759 * happened. 760 * Cleanup queue and notify interface statemachine. 761 * 762 * fi An instance of a channel statemachine. 763 * event The event, just happened. 764 * arg Generic pointer, casted from channel * upon call. 765 */ 766 static void ctcm_chx_fail(fsm_instance *fi, int event, void *arg) 767 { 768 ctcm_chx_cleanup(fi, CTC_STATE_NOTOP, arg); 769 } 770 771 /* 772 * Handle error during setup of channel. 773 * 774 * fi An instance of a channel statemachine. 775 * event The event, just happened. 776 * arg Generic pointer, casted from channel * upon call. 777 */ 778 static void ctcm_chx_setuperr(fsm_instance *fi, int event, void *arg) 779 { 780 struct channel *ch = arg; 781 struct net_device *dev = ch->netdev; 782 struct ctcm_priv *priv = dev->ml_priv; 783 784 /* 785 * Special case: Got UC_RCRESET on setmode. 786 * This means that remote side isn't setup. In this case 787 * simply retry after some 10 secs... 788 */ 789 if ((fsm_getstate(fi) == CTC_STATE_SETUPWAIT) && 790 ((event == CTC_EVENT_UC_RCRESET) || 791 (event == CTC_EVENT_UC_RSRESET))) { 792 fsm_newstate(fi, CTC_STATE_STARTRETRY); 793 fsm_deltimer(&ch->timer); 794 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 795 if (!IS_MPC(ch) && 796 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ)) { 797 int rc = ccw_device_halt(ch->cdev, 0); 798 if (rc != 0) 799 ctcm_ccw_check_rc(ch, rc, 800 "HaltIO in chx_setuperr"); 801 } 802 return; 803 } 804 805 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, 806 "%s(%s) : %s error during %s channel setup state=%s\n", 807 CTCM_FUNTAIL, dev->name, ctc_ch_event_names[event], 808 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? "RX" : "TX", 809 fsm_getstate_str(fi)); 810 811 if (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) { 812 fsm_newstate(fi, CTC_STATE_RXERR); 813 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 814 } else { 815 fsm_newstate(fi, CTC_STATE_TXERR); 816 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 817 } 818 } 819 820 /* 821 * Restart a channel after an error. 822 * 823 * fi An instance of a channel statemachine. 824 * event The event, just happened. 825 * arg Generic pointer, casted from channel * upon call. 826 */ 827 static void ctcm_chx_restart(fsm_instance *fi, int event, void *arg) 828 { 829 struct channel *ch = arg; 830 struct net_device *dev = ch->netdev; 831 unsigned long saveflags = 0; 832 int oldstate; 833 int rc; 834 835 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 836 "%s: %s[%d] of %s\n", 837 CTCM_FUNTAIL, ch->id, event, dev->name); 838 839 fsm_deltimer(&ch->timer); 840 841 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 842 oldstate = fsm_getstate(fi); 843 fsm_newstate(fi, CTC_STATE_STARTWAIT); 844 if (event == CTC_EVENT_TIMER) /* only for timer not yet locked */ 845 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 846 /* Such conditional locking is a known problem for 847 * sparse because its undeterministic in static view. 848 * Warnings should be ignored here. */ 849 rc = ccw_device_halt(ch->cdev, 0); 850 if (event == CTC_EVENT_TIMER) 851 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 852 if (rc != 0) { 853 if (rc != -EBUSY) { 854 fsm_deltimer(&ch->timer); 855 fsm_newstate(fi, oldstate); 856 } 857 ctcm_ccw_check_rc(ch, rc, "HaltIO in ctcm_chx_restart"); 858 } 859 } 860 861 /* 862 * Handle error during RX initial handshake (exchange of 863 * 0-length block header) 864 * 865 * fi An instance of a channel statemachine. 866 * event The event, just happened. 867 * arg Generic pointer, casted from channel * upon call. 868 */ 869 static void ctcm_chx_rxiniterr(fsm_instance *fi, int event, void *arg) 870 { 871 struct channel *ch = arg; 872 struct net_device *dev = ch->netdev; 873 struct ctcm_priv *priv = dev->ml_priv; 874 875 if (event == CTC_EVENT_TIMER) { 876 if (!IS_MPCDEV(dev)) 877 /* TODO : check if MPC deletes timer somewhere */ 878 fsm_deltimer(&ch->timer); 879 if (ch->retry++ < 3) 880 ctcm_chx_restart(fi, event, arg); 881 else { 882 fsm_newstate(fi, CTC_STATE_RXERR); 883 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 884 } 885 } else if (event == CTC_EVENT_UC_RCRESET) { 886 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 887 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 888 ctc_ch_event_names[event], fsm_getstate_str(fi)); 889 890 dev_info(&dev->dev, 891 "Init handshake not received, peer not ready yet\n"); 892 } else { 893 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 894 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 895 ctc_ch_event_names[event], fsm_getstate_str(fi)); 896 897 dev_warn(&dev->dev, 898 "Initialization failed with RX/TX init handshake " 899 "error %s\n", ctc_ch_event_names[event]); 900 } 901 } 902 903 /* 904 * Notify device statemachine if we gave up initialization 905 * of RX channel. 906 * 907 * fi An instance of a channel statemachine. 908 * event The event, just happened. 909 * arg Generic pointer, casted from channel * upon call. 910 */ 911 static void ctcm_chx_rxinitfail(fsm_instance *fi, int event, void *arg) 912 { 913 struct channel *ch = arg; 914 struct net_device *dev = ch->netdev; 915 struct ctcm_priv *priv = dev->ml_priv; 916 917 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 918 "%s(%s): RX %s busy, init. fail", 919 CTCM_FUNTAIL, dev->name, ch->id); 920 fsm_newstate(fi, CTC_STATE_RXERR); 921 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 922 } 923 924 /* 925 * Handle RX Unit check remote reset (remote disconnected) 926 * 927 * fi An instance of a channel statemachine. 928 * event The event, just happened. 929 * arg Generic pointer, casted from channel * upon call. 930 */ 931 static void ctcm_chx_rxdisc(fsm_instance *fi, int event, void *arg) 932 { 933 struct channel *ch = arg; 934 struct channel *ch2; 935 struct net_device *dev = ch->netdev; 936 struct ctcm_priv *priv = dev->ml_priv; 937 938 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 939 "%s: %s: remote disconnect - re-init ...", 940 CTCM_FUNTAIL, dev->name); 941 fsm_deltimer(&ch->timer); 942 /* 943 * Notify device statemachine 944 */ 945 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 946 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 947 948 fsm_newstate(fi, CTC_STATE_DTERM); 949 ch2 = priv->channel[CTCM_WRITE]; 950 fsm_newstate(ch2->fsm, CTC_STATE_DTERM); 951 952 ccw_device_halt(ch->cdev, 0); 953 ccw_device_halt(ch2->cdev, 0); 954 } 955 956 /* 957 * Handle error during TX channel initialization. 958 * 959 * fi An instance of a channel statemachine. 960 * event The event, just happened. 961 * arg Generic pointer, casted from channel * upon call. 962 */ 963 static void ctcm_chx_txiniterr(fsm_instance *fi, int event, void *arg) 964 { 965 struct channel *ch = arg; 966 struct net_device *dev = ch->netdev; 967 struct ctcm_priv *priv = dev->ml_priv; 968 969 if (event == CTC_EVENT_TIMER) { 970 fsm_deltimer(&ch->timer); 971 if (ch->retry++ < 3) 972 ctcm_chx_restart(fi, event, arg); 973 else { 974 fsm_newstate(fi, CTC_STATE_TXERR); 975 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 976 } 977 } else if (event == CTC_EVENT_UC_RCRESET) { 978 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, 979 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 980 ctc_ch_event_names[event], fsm_getstate_str(fi)); 981 982 dev_info(&dev->dev, 983 "Init handshake not sent, peer not ready yet\n"); 984 } else { 985 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 986 "%s(%s): %s in %s", CTCM_FUNTAIL, ch->id, 987 ctc_ch_event_names[event], fsm_getstate_str(fi)); 988 989 dev_warn(&dev->dev, 990 "Initialization failed with RX/TX init handshake " 991 "error %s\n", ctc_ch_event_names[event]); 992 } 993 } 994 995 /* 996 * Handle TX timeout by retrying operation. 997 * 998 * fi An instance of a channel statemachine. 999 * event The event, just happened. 1000 * arg Generic pointer, casted from channel * upon call. 1001 */ 1002 static void ctcm_chx_txretry(fsm_instance *fi, int event, void *arg) 1003 { 1004 struct channel *ch = arg; 1005 struct net_device *dev = ch->netdev; 1006 struct ctcm_priv *priv = dev->ml_priv; 1007 struct sk_buff *skb; 1008 1009 CTCM_PR_DEBUG("Enter: %s: cp=%i ch=0x%p id=%s\n", 1010 __func__, smp_processor_id(), ch, ch->id); 1011 1012 fsm_deltimer(&ch->timer); 1013 if (ch->retry++ > 3) { 1014 struct mpc_group *gptr = priv->mpcg; 1015 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1016 "%s: %s: retries exceeded", 1017 CTCM_FUNTAIL, ch->id); 1018 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1019 /* call restart if not MPC or if MPC and mpcg fsm is ready. 1020 use gptr as mpc indicator */ 1021 if (!(gptr && (fsm_getstate(gptr->fsm) != MPCG_STATE_READY))) 1022 ctcm_chx_restart(fi, event, arg); 1023 goto done; 1024 } 1025 1026 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, 1027 "%s : %s: retry %d", 1028 CTCM_FUNTAIL, ch->id, ch->retry); 1029 skb = skb_peek(&ch->io_queue); 1030 if (skb) { 1031 int rc = 0; 1032 unsigned long saveflags = 0; 1033 clear_normalized_cda(&ch->ccw[4]); 1034 ch->ccw[4].count = skb->len; 1035 if (set_normalized_cda(&ch->ccw[4], skb->data)) { 1036 CTCM_DBF_TEXT_(TRACE, CTC_DBF_INFO, 1037 "%s: %s: IDAL alloc failed", 1038 CTCM_FUNTAIL, ch->id); 1039 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1040 ctcm_chx_restart(fi, event, arg); 1041 goto done; 1042 } 1043 fsm_addtimer(&ch->timer, 1000, CTC_EVENT_TIMER, ch); 1044 if (event == CTC_EVENT_TIMER) /* for TIMER not yet locked */ 1045 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1046 /* Such conditional locking is a known problem for 1047 * sparse because its undeterministic in static view. 1048 * Warnings should be ignored here. */ 1049 if (do_debug_ccw) 1050 ctcmpc_dumpit((char *)&ch->ccw[3], 1051 sizeof(struct ccw1) * 3); 1052 1053 rc = ccw_device_start(ch->cdev, &ch->ccw[3], 0, 0xff, 0); 1054 if (event == CTC_EVENT_TIMER) 1055 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), 1056 saveflags); 1057 if (rc != 0) { 1058 fsm_deltimer(&ch->timer); 1059 ctcm_ccw_check_rc(ch, rc, "TX in chx_txretry"); 1060 ctcm_purge_skb_queue(&ch->io_queue); 1061 } 1062 } 1063 done: 1064 return; 1065 } 1066 1067 /* 1068 * Handle fatal errors during an I/O command. 1069 * 1070 * fi An instance of a channel statemachine. 1071 * event The event, just happened. 1072 * arg Generic pointer, casted from channel * upon call. 1073 */ 1074 static void ctcm_chx_iofatal(fsm_instance *fi, int event, void *arg) 1075 { 1076 struct channel *ch = arg; 1077 struct net_device *dev = ch->netdev; 1078 struct ctcm_priv *priv = dev->ml_priv; 1079 int rd = CHANNEL_DIRECTION(ch->flags); 1080 1081 fsm_deltimer(&ch->timer); 1082 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, 1083 "%s: %s: %s unrecoverable channel error", 1084 CTCM_FUNTAIL, ch->id, rd == CTCM_READ ? "RX" : "TX"); 1085 1086 if (IS_MPC(ch)) { 1087 priv->stats.tx_dropped++; 1088 priv->stats.tx_errors++; 1089 } 1090 if (rd == CTCM_READ) { 1091 fsm_newstate(fi, CTC_STATE_RXERR); 1092 fsm_event(priv->fsm, DEV_EVENT_RXDOWN, dev); 1093 } else { 1094 fsm_newstate(fi, CTC_STATE_TXERR); 1095 fsm_event(priv->fsm, DEV_EVENT_TXDOWN, dev); 1096 } 1097 } 1098 1099 /* 1100 * The ctcm statemachine for a channel. 1101 */ 1102 const fsm_node ch_fsm[] = { 1103 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1104 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1105 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1106 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1107 1108 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1109 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1110 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1111 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1112 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1113 1114 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1115 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1116 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1117 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1118 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1119 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1120 1121 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1122 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1123 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1124 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1125 1126 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1127 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1128 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, chx_firstio }, 1129 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1130 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1131 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1132 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1133 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1134 1135 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1136 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1137 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, chx_rxidle }, 1138 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1139 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1140 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1141 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1142 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1143 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, chx_firstio }, 1144 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1145 1146 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1147 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1148 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, chx_rx }, 1149 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1150 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1151 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1152 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, chx_rx }, 1153 1154 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1155 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 1156 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 1157 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 1158 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 1159 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 1160 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1161 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1162 1163 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1164 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1165 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, chx_firstio }, 1166 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1167 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1168 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1169 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1170 1171 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 1172 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 1173 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 1174 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1175 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1176 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1177 1178 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 1179 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 1180 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1181 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 1182 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 1183 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1184 1185 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 1186 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 1187 { CTC_STATE_TX, CTC_EVENT_FINSTAT, chx_txdone }, 1188 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_txretry }, 1189 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_txretry }, 1190 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 1191 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1192 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1193 1194 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1195 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 1196 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1197 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1198 }; 1199 1200 int ch_fsm_len = ARRAY_SIZE(ch_fsm); 1201 1202 /* 1203 * MPC actions for mpc channel statemachine 1204 * handling of MPC protocol requires extra 1205 * statemachine and actions which are prefixed ctcmpc_ . 1206 * The ctc_ch_states and ctc_ch_state_names, 1207 * ctc_ch_events and ctc_ch_event_names share the ctcm definitions 1208 * which are expanded by some elements. 1209 */ 1210 1211 /* 1212 * Actions for mpc channel statemachine. 1213 */ 1214 1215 /* 1216 * Normal data has been send. Free the corresponding 1217 * skb (it's in io_queue), reset dev->tbusy and 1218 * revert to idle state. 1219 * 1220 * fi An instance of a channel statemachine. 1221 * event The event, just happened. 1222 * arg Generic pointer, casted from channel * upon call. 1223 */ 1224 static void ctcmpc_chx_txdone(fsm_instance *fi, int event, void *arg) 1225 { 1226 struct channel *ch = arg; 1227 struct net_device *dev = ch->netdev; 1228 struct ctcm_priv *priv = dev->ml_priv; 1229 struct mpc_group *grp = priv->mpcg; 1230 struct sk_buff *skb; 1231 int first = 1; 1232 int i; 1233 __u32 data_space; 1234 unsigned long duration; 1235 struct sk_buff *peekskb; 1236 int rc; 1237 struct th_header *header; 1238 struct pdu *p_header; 1239 unsigned long done_stamp = jiffies; 1240 1241 CTCM_PR_DEBUG("Enter %s: %s cp:%i\n", 1242 __func__, dev->name, smp_processor_id()); 1243 1244 duration = done_stamp - ch->prof.send_stamp; 1245 if (duration > ch->prof.tx_time) 1246 ch->prof.tx_time = duration; 1247 1248 if (ch->irb->scsw.cmd.count != 0) 1249 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1250 "%s(%s): TX not complete, remaining %d bytes", 1251 CTCM_FUNTAIL, dev->name, ch->irb->scsw.cmd.count); 1252 fsm_deltimer(&ch->timer); 1253 while ((skb = skb_dequeue(&ch->io_queue))) { 1254 priv->stats.tx_packets++; 1255 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; 1256 if (first) { 1257 priv->stats.tx_bytes += 2; 1258 first = 0; 1259 } 1260 refcount_dec(&skb->users); 1261 dev_kfree_skb_irq(skb); 1262 } 1263 spin_lock(&ch->collect_lock); 1264 clear_normalized_cda(&ch->ccw[4]); 1265 if ((ch->collect_len <= 0) || (grp->in_sweep != 0)) { 1266 spin_unlock(&ch->collect_lock); 1267 fsm_newstate(fi, CTC_STATE_TXIDLE); 1268 goto done; 1269 } 1270 1271 if (ctcm_checkalloc_buffer(ch)) { 1272 spin_unlock(&ch->collect_lock); 1273 goto done; 1274 } 1275 ch->trans_skb->data = ch->trans_skb_data; 1276 skb_reset_tail_pointer(ch->trans_skb); 1277 ch->trans_skb->len = 0; 1278 if (ch->prof.maxmulti < (ch->collect_len + TH_HEADER_LENGTH)) 1279 ch->prof.maxmulti = ch->collect_len + TH_HEADER_LENGTH; 1280 if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) 1281 ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); 1282 i = 0; 1283 p_header = NULL; 1284 data_space = grp->group_max_buflen - TH_HEADER_LENGTH; 1285 1286 CTCM_PR_DBGDATA("%s: building trans_skb from collect_q" 1287 " data_space:%04x\n", 1288 __func__, data_space); 1289 1290 while ((skb = skb_dequeue(&ch->collect_queue))) { 1291 skb_put_data(ch->trans_skb, skb->data, skb->len); 1292 p_header = (struct pdu *) 1293 (skb_tail_pointer(ch->trans_skb) - skb->len); 1294 p_header->pdu_flag = 0x00; 1295 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) 1296 p_header->pdu_flag |= 0x60; 1297 else 1298 p_header->pdu_flag |= 0x20; 1299 1300 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1301 __func__, ch->trans_skb->len); 1302 CTCM_PR_DBGDATA("%s: pdu header and data for up" 1303 " to 32 bytes sent to vtam\n", __func__); 1304 CTCM_D3_DUMP((char *)p_header, min_t(int, skb->len, 32)); 1305 1306 ch->collect_len -= skb->len; 1307 data_space -= skb->len; 1308 priv->stats.tx_packets++; 1309 priv->stats.tx_bytes += skb->len; 1310 refcount_dec(&skb->users); 1311 dev_kfree_skb_any(skb); 1312 peekskb = skb_peek(&ch->collect_queue); 1313 if (peekskb->len > data_space) 1314 break; 1315 i++; 1316 } 1317 /* p_header points to the last one we handled */ 1318 if (p_header) 1319 p_header->pdu_flag |= PDU_LAST; /*Say it's the last one*/ 1320 1321 header = skb_push(ch->trans_skb, TH_HEADER_LENGTH); 1322 memset(header, 0, TH_HEADER_LENGTH); 1323 1324 header->th_ch_flag = TH_HAS_PDU; /* Normal data */ 1325 ch->th_seq_num++; 1326 header->th_seq_num = ch->th_seq_num; 1327 1328 CTCM_PR_DBGDATA("%s: ToVTAM_th_seq= %08x\n" , 1329 __func__, ch->th_seq_num); 1330 1331 CTCM_PR_DBGDATA("%s: trans_skb len:%04x \n", 1332 __func__, ch->trans_skb->len); 1333 CTCM_PR_DBGDATA("%s: up-to-50 bytes of trans_skb " 1334 "data to vtam from collect_q\n", __func__); 1335 CTCM_D3_DUMP((char *)ch->trans_skb->data, 1336 min_t(int, ch->trans_skb->len, 50)); 1337 1338 spin_unlock(&ch->collect_lock); 1339 clear_normalized_cda(&ch->ccw[1]); 1340 1341 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1342 (void *)(u64)dma32_to_u32(ch->ccw[1].cda), 1343 ch->trans_skb->data); 1344 ch->ccw[1].count = ch->max_bufsize; 1345 1346 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { 1347 dev_kfree_skb_any(ch->trans_skb); 1348 ch->trans_skb = NULL; 1349 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, 1350 "%s: %s: IDAL alloc failed", 1351 CTCM_FUNTAIL, ch->id); 1352 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); 1353 return; 1354 } 1355 1356 CTCM_PR_DBGDATA("ccwcda=0x%p data=0x%p\n", 1357 (void *)(u64)dma32_to_u32(ch->ccw[1].cda), 1358 ch->trans_skb->data); 1359 1360 ch->ccw[1].count = ch->trans_skb->len; 1361 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); 1362 ch->prof.send_stamp = jiffies; 1363 if (do_debug_ccw) 1364 ctcmpc_dumpit((char *)&ch->ccw[0], sizeof(struct ccw1) * 3); 1365 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 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 too 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(%s): 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_hardirq(); 1462 if (dolock) 1463 spin_lock_irqsave( 1464 get_ccwdev_lock(ch->cdev), saveflags); 1465 rc = ccw_device_start(ch->cdev, &ch->ccw[0], 0, 0xff, 0); 1466 if (dolock) /* see remark about conditional locking */ 1467 spin_unlock_irqrestore( 1468 get_ccwdev_lock(ch->cdev), saveflags); 1469 if (rc != 0) 1470 ctcm_ccw_check_rc(ch, rc, "normal RX"); 1471 break; 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], 0, 0xff, 0); 1573 if (event == CTC_EVENT_START) 1574 spin_unlock_irqrestore( 1575 get_ccwdev_lock(ch->cdev), saveflags); 1576 if (rc != 0) { 1577 fsm_newstate(fi, CTC_STATE_RXINIT); 1578 ctcm_ccw_check_rc(ch, rc, "initial RX"); 1579 goto done; 1580 } 1581 break; 1582 default: 1583 break; 1584 } 1585 1586 fsm_event(priv->fsm, DEV_EVENT_RXUP, dev); 1587 done: 1588 return; 1589 } 1590 1591 /* 1592 * ctcmpc channel FSM action 1593 * called from several points in ctcmpc_ch_fsm 1594 * ctcmpc only 1595 */ 1596 static void ctcmpc_chx_attn(fsm_instance *fsm, int event, void *arg) 1597 { 1598 struct channel *ch = arg; 1599 struct net_device *dev = ch->netdev; 1600 struct ctcm_priv *priv = dev->ml_priv; 1601 struct mpc_group *grp = priv->mpcg; 1602 1603 CTCM_PR_DEBUG("%s(%s): %s(ch=0x%p), cp=%i, ChStat:%s, GrpStat:%s\n", 1604 __func__, dev->name, ch->id, ch, smp_processor_id(), 1605 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1606 1607 switch (fsm_getstate(grp->fsm)) { 1608 case MPCG_STATE_XID2INITW: 1609 /* ok..start yside xid exchanges */ 1610 if (!ch->in_mpcgroup) 1611 break; 1612 if (fsm_getstate(ch->fsm) == CH_XID0_PENDING) { 1613 fsm_deltimer(&grp->timer); 1614 fsm_addtimer(&grp->timer, 1615 MPC_XID_TIMEOUT_VALUE, 1616 MPCG_EVENT_TIMER, dev); 1617 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, ch); 1618 1619 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1620 /* attn rcvd before xid0 processed via bh */ 1621 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1622 break; 1623 case MPCG_STATE_XID2INITX: 1624 case MPCG_STATE_XID0IOWAIT: 1625 case MPCG_STATE_XID0IOWAIX: 1626 /* attn rcvd before xid0 processed on ch 1627 but mid-xid0 processing for group */ 1628 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING1) 1629 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1630 break; 1631 case MPCG_STATE_XID7INITW: 1632 case MPCG_STATE_XID7INITX: 1633 case MPCG_STATE_XID7INITI: 1634 case MPCG_STATE_XID7INITZ: 1635 switch (fsm_getstate(ch->fsm)) { 1636 case CH_XID7_PENDING: 1637 fsm_newstate(ch->fsm, CH_XID7_PENDING1); 1638 break; 1639 case CH_XID7_PENDING2: 1640 fsm_newstate(ch->fsm, CH_XID7_PENDING3); 1641 break; 1642 } 1643 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 1644 break; 1645 } 1646 1647 return; 1648 } 1649 1650 /* 1651 * ctcmpc channel FSM action 1652 * called from one point in ctcmpc_ch_fsm 1653 * ctcmpc only 1654 */ 1655 static void ctcmpc_chx_attnbusy(fsm_instance *fsm, int event, void *arg) 1656 { 1657 struct channel *ch = arg; 1658 struct net_device *dev = ch->netdev; 1659 struct ctcm_priv *priv = dev->ml_priv; 1660 struct mpc_group *grp = priv->mpcg; 1661 1662 CTCM_PR_DEBUG("%s(%s): %s\n ChState:%s GrpState:%s\n", 1663 __func__, dev->name, ch->id, 1664 fsm_getstate_str(ch->fsm), fsm_getstate_str(grp->fsm)); 1665 1666 fsm_deltimer(&ch->timer); 1667 1668 switch (fsm_getstate(grp->fsm)) { 1669 case MPCG_STATE_XID0IOWAIT: 1670 /* vtam wants to be primary.start yside xid exchanges*/ 1671 /* only receive one attn-busy at a time so must not */ 1672 /* change state each time */ 1673 grp->changed_side = 1; 1674 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1675 break; 1676 case MPCG_STATE_XID2INITW: 1677 if (grp->changed_side == 1) { 1678 grp->changed_side = 2; 1679 break; 1680 } 1681 /* process began via call to establish_conn */ 1682 /* so must report failure instead of reverting */ 1683 /* back to ready-for-xid passive state */ 1684 if (grp->estconnfunc) 1685 goto done; 1686 /* this attnbusy is NOT the result of xside xid */ 1687 /* collisions so yside must have been triggered */ 1688 /* by an ATTN that was not intended to start XID */ 1689 /* processing. Revert back to ready-for-xid and */ 1690 /* wait for ATTN interrupt to signal xid start */ 1691 if (fsm_getstate(ch->fsm) == CH_XID0_INPROGRESS) { 1692 fsm_newstate(ch->fsm, CH_XID0_PENDING) ; 1693 fsm_deltimer(&grp->timer); 1694 goto done; 1695 } 1696 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1697 goto done; 1698 case MPCG_STATE_XID2INITX: 1699 /* XID2 was received before ATTN Busy for second 1700 channel.Send yside xid for second channel. 1701 */ 1702 if (grp->changed_side == 1) { 1703 grp->changed_side = 2; 1704 break; 1705 } 1706 fallthrough; 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], 0, 0xff, 0); 1828 spin_unlock_irqrestore(get_ccwdev_lock(wch->cdev), saveflags); 1829 1830 if ((grp->sweep_req_pend_num == 0) && 1831 (grp->sweep_rsp_pend_num == 0)) { 1832 grp->in_sweep = 0; 1833 rch->th_seq_num = 0x00; 1834 wch->th_seq_num = 0x00; 1835 ctcm_clear_busy_do(dev); 1836 } 1837 1838 CTCM_PR_DBGDATA("%s: To-/From-VTAM_th_seq = %08x/%08x\n" , 1839 __func__, wch->th_seq_num, rch->th_seq_num); 1840 1841 if (rc != 0) 1842 ctcm_ccw_check_rc(wch, rc, "send sweep"); 1843 1844 done: 1845 return; 1846 } 1847 1848 1849 /* 1850 * The ctcmpc statemachine for a channel. 1851 */ 1852 1853 const fsm_node ctcmpc_ch_fsm[] = { 1854 { CTC_STATE_STOPPED, CTC_EVENT_STOP, ctcm_action_nop }, 1855 { CTC_STATE_STOPPED, CTC_EVENT_START, ctcm_chx_start }, 1856 { CTC_STATE_STOPPED, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1857 { CTC_STATE_STOPPED, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1858 { CTC_STATE_STOPPED, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1859 1860 { CTC_STATE_NOTOP, CTC_EVENT_STOP, ctcm_chx_stop }, 1861 { CTC_STATE_NOTOP, CTC_EVENT_START, ctcm_action_nop }, 1862 { CTC_STATE_NOTOP, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1863 { CTC_STATE_NOTOP, CTC_EVENT_MC_FAIL, ctcm_action_nop }, 1864 { CTC_STATE_NOTOP, CTC_EVENT_MC_GOOD, ctcm_chx_start }, 1865 { CTC_STATE_NOTOP, CTC_EVENT_UC_RCRESET, ctcm_chx_stop }, 1866 { CTC_STATE_NOTOP, CTC_EVENT_UC_RSRESET, ctcm_chx_stop }, 1867 { CTC_STATE_NOTOP, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1868 1869 { CTC_STATE_STARTWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1870 { CTC_STATE_STARTWAIT, CTC_EVENT_START, ctcm_action_nop }, 1871 { CTC_STATE_STARTWAIT, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1872 { CTC_STATE_STARTWAIT, CTC_EVENT_TIMER, ctcm_chx_setuperr }, 1873 { CTC_STATE_STARTWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1874 { CTC_STATE_STARTWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1875 1876 { CTC_STATE_STARTRETRY, CTC_EVENT_STOP, ctcm_chx_haltio }, 1877 { CTC_STATE_STARTRETRY, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1878 { CTC_STATE_STARTRETRY, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 1879 { CTC_STATE_STARTRETRY, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1880 { CTC_STATE_STARTRETRY, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1881 1882 { CTC_STATE_SETUPWAIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1883 { CTC_STATE_SETUPWAIT, CTC_EVENT_START, ctcm_action_nop }, 1884 { CTC_STATE_SETUPWAIT, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 1885 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1886 { CTC_STATE_SETUPWAIT, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1887 { CTC_STATE_SETUPWAIT, CTC_EVENT_TIMER, ctcm_chx_setmode }, 1888 { CTC_STATE_SETUPWAIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1889 { CTC_STATE_SETUPWAIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1890 1891 { CTC_STATE_RXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 1892 { CTC_STATE_RXINIT, CTC_EVENT_START, ctcm_action_nop }, 1893 { CTC_STATE_RXINIT, CTC_EVENT_FINSTAT, ctcmpc_chx_rxidle }, 1894 { CTC_STATE_RXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_rxiniterr }, 1895 { CTC_STATE_RXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_rxiniterr }, 1896 { CTC_STATE_RXINIT, CTC_EVENT_TIMER, ctcm_chx_rxiniterr }, 1897 { CTC_STATE_RXINIT, CTC_EVENT_ATTNBUSY, ctcm_chx_rxinitfail }, 1898 { CTC_STATE_RXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1899 { CTC_STATE_RXINIT, CTC_EVENT_UC_ZERO, ctcmpc_chx_firstio }, 1900 { CTC_STATE_RXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1901 1902 { CH_XID0_PENDING, CTC_EVENT_FINSTAT, ctcm_action_nop }, 1903 { CH_XID0_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1904 { CH_XID0_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1905 { CH_XID0_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1906 { CH_XID0_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1907 { CH_XID0_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1908 { CH_XID0_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1909 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1910 { CH_XID0_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1911 { CH_XID0_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1912 1913 { CH_XID0_INPROGRESS, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1914 { CH_XID0_INPROGRESS, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1915 { CH_XID0_INPROGRESS, CTC_EVENT_STOP, ctcm_chx_haltio }, 1916 { CH_XID0_INPROGRESS, CTC_EVENT_START, ctcm_action_nop }, 1917 { CH_XID0_INPROGRESS, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1918 { CH_XID0_INPROGRESS, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1919 { CH_XID0_INPROGRESS, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1920 { CH_XID0_INPROGRESS, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1921 { CH_XID0_INPROGRESS, CTC_EVENT_ATTNBUSY, ctcmpc_chx_attnbusy }, 1922 { CH_XID0_INPROGRESS, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1923 { CH_XID0_INPROGRESS, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1924 1925 { CH_XID7_PENDING, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1926 { CH_XID7_PENDING, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1927 { CH_XID7_PENDING, CTC_EVENT_STOP, ctcm_chx_haltio }, 1928 { CH_XID7_PENDING, CTC_EVENT_START, ctcm_action_nop }, 1929 { CH_XID7_PENDING, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1930 { CH_XID7_PENDING, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1931 { CH_XID7_PENDING, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1932 { CH_XID7_PENDING, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1933 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1934 { CH_XID7_PENDING, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1935 { CH_XID7_PENDING, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1936 { CH_XID7_PENDING, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1937 { CH_XID7_PENDING, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1938 1939 { CH_XID7_PENDING1, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1940 { CH_XID7_PENDING1, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1941 { CH_XID7_PENDING1, CTC_EVENT_STOP, ctcm_chx_haltio }, 1942 { CH_XID7_PENDING1, CTC_EVENT_START, ctcm_action_nop }, 1943 { CH_XID7_PENDING1, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1944 { CH_XID7_PENDING1, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1945 { CH_XID7_PENDING1, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1946 { CH_XID7_PENDING1, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1947 { CH_XID7_PENDING1, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1948 { CH_XID7_PENDING1, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1949 { CH_XID7_PENDING1, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1950 { CH_XID7_PENDING1, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1951 1952 { CH_XID7_PENDING2, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1953 { CH_XID7_PENDING2, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1954 { CH_XID7_PENDING2, CTC_EVENT_STOP, ctcm_chx_haltio }, 1955 { CH_XID7_PENDING2, CTC_EVENT_START, ctcm_action_nop }, 1956 { CH_XID7_PENDING2, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1957 { CH_XID7_PENDING2, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1958 { CH_XID7_PENDING2, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1959 { CH_XID7_PENDING2, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1960 { CH_XID7_PENDING2, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1961 { CH_XID7_PENDING2, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1962 { CH_XID7_PENDING2, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1963 { CH_XID7_PENDING2, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1964 1965 { CH_XID7_PENDING3, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1966 { CH_XID7_PENDING3, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1967 { CH_XID7_PENDING3, CTC_EVENT_STOP, ctcm_chx_haltio }, 1968 { CH_XID7_PENDING3, CTC_EVENT_START, ctcm_action_nop }, 1969 { CH_XID7_PENDING3, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1970 { CH_XID7_PENDING3, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1971 { CH_XID7_PENDING3, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1972 { CH_XID7_PENDING3, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1973 { CH_XID7_PENDING3, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1974 { CH_XID7_PENDING3, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1975 { CH_XID7_PENDING3, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1976 { CH_XID7_PENDING3, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1977 1978 { CH_XID7_PENDING4, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1979 { CH_XID7_PENDING4, CTC_EVENT_ATTN, ctcmpc_chx_attn }, 1980 { CH_XID7_PENDING4, CTC_EVENT_STOP, ctcm_chx_haltio }, 1981 { CH_XID7_PENDING4, CTC_EVENT_START, ctcm_action_nop }, 1982 { CH_XID7_PENDING4, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1983 { CH_XID7_PENDING4, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1984 { CH_XID7_PENDING4, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1985 { CH_XID7_PENDING4, CTC_EVENT_UC_RCRESET, ctcm_chx_setuperr }, 1986 { CH_XID7_PENDING4, CTC_EVENT_UC_RSRESET, ctcm_chx_setuperr }, 1987 { CH_XID7_PENDING4, CTC_EVENT_ATTNBUSY, ctcm_chx_iofatal }, 1988 { CH_XID7_PENDING4, CTC_EVENT_TIMER, ctcmpc_chx_resend }, 1989 { CH_XID7_PENDING4, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 1990 1991 { CTC_STATE_RXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 1992 { CTC_STATE_RXIDLE, CTC_EVENT_START, ctcm_action_nop }, 1993 { CTC_STATE_RXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_rx }, 1994 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_rxdisc }, 1995 { CTC_STATE_RXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 1996 { CTC_STATE_RXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 1997 { CTC_STATE_RXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 1998 { CTC_STATE_RXIDLE, CTC_EVENT_UC_ZERO, ctcmpc_chx_rx }, 1999 2000 { CTC_STATE_TXINIT, CTC_EVENT_STOP, ctcm_chx_haltio }, 2001 { CTC_STATE_TXINIT, CTC_EVENT_START, ctcm_action_nop }, 2002 { CTC_STATE_TXINIT, CTC_EVENT_FINSTAT, ctcm_chx_txidle }, 2003 { CTC_STATE_TXINIT, CTC_EVENT_UC_RCRESET, ctcm_chx_txiniterr }, 2004 { CTC_STATE_TXINIT, CTC_EVENT_UC_RSRESET, ctcm_chx_txiniterr }, 2005 { CTC_STATE_TXINIT, CTC_EVENT_TIMER, ctcm_chx_txiniterr }, 2006 { CTC_STATE_TXINIT, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2007 { CTC_STATE_TXINIT, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2008 { CTC_STATE_TXINIT, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2009 2010 { CTC_STATE_TXIDLE, CTC_EVENT_STOP, ctcm_chx_haltio }, 2011 { CTC_STATE_TXIDLE, CTC_EVENT_START, ctcm_action_nop }, 2012 { CTC_STATE_TXIDLE, CTC_EVENT_FINSTAT, ctcmpc_chx_firstio }, 2013 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2014 { CTC_STATE_TXIDLE, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2015 { CTC_STATE_TXIDLE, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2016 { CTC_STATE_TXIDLE, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2017 { CTC_STATE_TXIDLE, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2018 2019 { CTC_STATE_TERM, CTC_EVENT_STOP, ctcm_action_nop }, 2020 { CTC_STATE_TERM, CTC_EVENT_START, ctcm_chx_restart }, 2021 { CTC_STATE_TERM, CTC_EVENT_FINSTAT, ctcm_chx_stopped }, 2022 { CTC_STATE_TERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2023 { CTC_STATE_TERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2024 { CTC_STATE_TERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2025 { CTC_STATE_TERM, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2026 { CTC_STATE_TERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2027 2028 { CTC_STATE_DTERM, CTC_EVENT_STOP, ctcm_chx_haltio }, 2029 { CTC_STATE_DTERM, CTC_EVENT_START, ctcm_chx_restart }, 2030 { CTC_STATE_DTERM, CTC_EVENT_FINSTAT, ctcm_chx_setmode }, 2031 { CTC_STATE_DTERM, CTC_EVENT_UC_RCRESET, ctcm_action_nop }, 2032 { CTC_STATE_DTERM, CTC_EVENT_UC_RSRESET, ctcm_action_nop }, 2033 { CTC_STATE_DTERM, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2034 { CTC_STATE_DTERM, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2035 2036 { CTC_STATE_TX, CTC_EVENT_STOP, ctcm_chx_haltio }, 2037 { CTC_STATE_TX, CTC_EVENT_START, ctcm_action_nop }, 2038 { CTC_STATE_TX, CTC_EVENT_FINSTAT, ctcmpc_chx_txdone }, 2039 { CTC_STATE_TX, CTC_EVENT_UC_RCRESET, ctcm_chx_fail }, 2040 { CTC_STATE_TX, CTC_EVENT_UC_RSRESET, ctcm_chx_fail }, 2041 { CTC_STATE_TX, CTC_EVENT_TIMER, ctcm_chx_txretry }, 2042 { CTC_STATE_TX, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2043 { CTC_STATE_TX, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2044 { CTC_STATE_TX, CTC_EVENT_RSWEEP_TIMER, ctcmpc_chx_send_sweep }, 2045 { CTC_STATE_TX, CTC_EVENT_IO_EBUSY, ctcm_chx_fail }, 2046 2047 { CTC_STATE_RXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2048 { CTC_STATE_TXERR, CTC_EVENT_STOP, ctcm_chx_haltio }, 2049 { CTC_STATE_TXERR, CTC_EVENT_IO_ENODEV, ctcm_chx_iofatal }, 2050 { CTC_STATE_TXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2051 { CTC_STATE_RXERR, CTC_EVENT_MC_FAIL, ctcm_chx_fail }, 2052 }; 2053 2054 int mpc_ch_fsm_len = ARRAY_SIZE(ctcmpc_ch_fsm); 2055 2056 /* 2057 * Actions for interface - statemachine. 2058 */ 2059 2060 /* 2061 * Startup channels by sending CTC_EVENT_START to each channel. 2062 * 2063 * fi An instance of an interface statemachine. 2064 * event The event, just happened. 2065 * arg Generic pointer, casted from struct net_device * upon call. 2066 */ 2067 static void dev_action_start(fsm_instance *fi, int event, void *arg) 2068 { 2069 struct net_device *dev = arg; 2070 struct ctcm_priv *priv = dev->ml_priv; 2071 int direction; 2072 2073 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2074 2075 fsm_deltimer(&priv->restart_timer); 2076 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2077 if (IS_MPC(priv)) 2078 priv->mpcg->channels_terminating = 0; 2079 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 2080 struct channel *ch = priv->channel[direction]; 2081 fsm_event(ch->fsm, CTC_EVENT_START, ch); 2082 } 2083 } 2084 2085 /* 2086 * Shutdown channels by sending CTC_EVENT_STOP to each channel. 2087 * 2088 * fi An instance of an interface statemachine. 2089 * event The event, just happened. 2090 * arg Generic pointer, casted from struct net_device * upon call. 2091 */ 2092 static void dev_action_stop(fsm_instance *fi, int event, void *arg) 2093 { 2094 int direction; 2095 struct net_device *dev = arg; 2096 struct ctcm_priv *priv = dev->ml_priv; 2097 2098 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2099 2100 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2101 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 2102 struct channel *ch = priv->channel[direction]; 2103 fsm_event(ch->fsm, CTC_EVENT_STOP, ch); 2104 ch->th_seq_num = 0x00; 2105 CTCM_PR_DEBUG("%s: CH_th_seq= %08x\n", 2106 __func__, ch->th_seq_num); 2107 } 2108 if (IS_MPC(priv)) 2109 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2110 } 2111 2112 static void dev_action_restart(fsm_instance *fi, int event, void *arg) 2113 { 2114 int restart_timer; 2115 struct net_device *dev = arg; 2116 struct ctcm_priv *priv = dev->ml_priv; 2117 2118 CTCMY_DBF_DEV_NAME(TRACE, dev, ""); 2119 2120 if (IS_MPC(priv)) { 2121 restart_timer = CTCM_TIME_1_SEC; 2122 } else { 2123 restart_timer = CTCM_TIME_5_SEC; 2124 } 2125 dev_info(&dev->dev, "Restarting device\n"); 2126 2127 dev_action_stop(fi, event, arg); 2128 fsm_event(priv->fsm, DEV_EVENT_STOP, dev); 2129 if (IS_MPC(priv)) 2130 fsm_newstate(priv->mpcg->fsm, MPCG_STATE_RESET); 2131 2132 /* going back into start sequence too quickly can */ 2133 /* result in the other side becoming unreachable due */ 2134 /* to sense reported when IO is aborted */ 2135 fsm_addtimer(&priv->restart_timer, restart_timer, 2136 DEV_EVENT_START, dev); 2137 } 2138 2139 /* 2140 * Called from channel statemachine 2141 * when a channel is up and running. 2142 * 2143 * fi An instance of an interface statemachine. 2144 * event The event, just happened. 2145 * arg Generic pointer, casted from struct net_device * upon call. 2146 */ 2147 static void dev_action_chup(fsm_instance *fi, int event, void *arg) 2148 { 2149 struct net_device *dev = arg; 2150 struct ctcm_priv *priv = dev->ml_priv; 2151 int dev_stat = fsm_getstate(fi); 2152 2153 CTCM_DBF_TEXT_(SETUP, CTC_DBF_NOTICE, 2154 "%s(%s): priv = %p [%d,%d]\n ", CTCM_FUNTAIL, 2155 dev->name, dev->ml_priv, dev_stat, event); 2156 2157 switch (fsm_getstate(fi)) { 2158 case DEV_STATE_STARTWAIT_RXTX: 2159 if (event == DEV_EVENT_RXUP) 2160 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2161 else 2162 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2163 break; 2164 case DEV_STATE_STARTWAIT_RX: 2165 if (event == DEV_EVENT_RXUP) { 2166 fsm_newstate(fi, DEV_STATE_RUNNING); 2167 dev_info(&dev->dev, 2168 "Connected with remote side\n"); 2169 ctcm_clear_busy(dev); 2170 } 2171 break; 2172 case DEV_STATE_STARTWAIT_TX: 2173 if (event == DEV_EVENT_TXUP) { 2174 fsm_newstate(fi, DEV_STATE_RUNNING); 2175 dev_info(&dev->dev, 2176 "Connected with remote side\n"); 2177 ctcm_clear_busy(dev); 2178 } 2179 break; 2180 case DEV_STATE_STOPWAIT_TX: 2181 if (event == DEV_EVENT_RXUP) 2182 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2183 break; 2184 case DEV_STATE_STOPWAIT_RX: 2185 if (event == DEV_EVENT_TXUP) 2186 fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); 2187 break; 2188 } 2189 2190 if (IS_MPC(priv)) { 2191 if (event == DEV_EVENT_RXUP) 2192 mpc_channel_action(priv->channel[CTCM_READ], 2193 CTCM_READ, MPC_CHANNEL_ADD); 2194 else 2195 mpc_channel_action(priv->channel[CTCM_WRITE], 2196 CTCM_WRITE, MPC_CHANNEL_ADD); 2197 } 2198 } 2199 2200 /* 2201 * Called from device statemachine 2202 * when a channel has been shutdown. 2203 * 2204 * fi An instance of an interface statemachine. 2205 * event The event, just happened. 2206 * arg Generic pointer, casted from struct net_device * upon call. 2207 */ 2208 static void dev_action_chdown(fsm_instance *fi, int event, void *arg) 2209 { 2210 2211 struct net_device *dev = arg; 2212 struct ctcm_priv *priv = dev->ml_priv; 2213 2214 CTCMY_DBF_DEV_NAME(SETUP, dev, ""); 2215 2216 switch (fsm_getstate(fi)) { 2217 case DEV_STATE_RUNNING: 2218 if (event == DEV_EVENT_TXDOWN) 2219 fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); 2220 else 2221 fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); 2222 break; 2223 case DEV_STATE_STARTWAIT_RX: 2224 if (event == DEV_EVENT_TXDOWN) 2225 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2226 break; 2227 case DEV_STATE_STARTWAIT_TX: 2228 if (event == DEV_EVENT_RXDOWN) 2229 fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); 2230 break; 2231 case DEV_STATE_STOPWAIT_RXTX: 2232 if (event == DEV_EVENT_TXDOWN) 2233 fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); 2234 else 2235 fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); 2236 break; 2237 case DEV_STATE_STOPWAIT_RX: 2238 if (event == DEV_EVENT_RXDOWN) 2239 fsm_newstate(fi, DEV_STATE_STOPPED); 2240 break; 2241 case DEV_STATE_STOPWAIT_TX: 2242 if (event == DEV_EVENT_TXDOWN) 2243 fsm_newstate(fi, DEV_STATE_STOPPED); 2244 break; 2245 } 2246 if (IS_MPC(priv)) { 2247 if (event == DEV_EVENT_RXDOWN) 2248 mpc_channel_action(priv->channel[CTCM_READ], 2249 CTCM_READ, MPC_CHANNEL_REMOVE); 2250 else 2251 mpc_channel_action(priv->channel[CTCM_WRITE], 2252 CTCM_WRITE, MPC_CHANNEL_REMOVE); 2253 } 2254 } 2255 2256 const fsm_node dev_fsm[] = { 2257 { DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start }, 2258 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, 2259 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2260 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2261 { DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2262 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, 2263 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2264 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2265 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2266 { DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2267 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, 2268 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2269 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2270 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2271 { DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2272 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, 2273 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, 2274 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, 2275 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2276 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2277 { DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, 2278 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, 2279 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, 2280 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, 2281 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, 2282 { DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, 2283 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, 2284 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, 2285 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, 2286 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, 2287 { DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, 2288 { DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, 2289 { DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, 2290 { DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, 2291 { DEV_STATE_RUNNING, DEV_EVENT_TXUP, ctcm_action_nop }, 2292 { DEV_STATE_RUNNING, DEV_EVENT_RXUP, ctcm_action_nop }, 2293 { DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, 2294 }; 2295 2296 int dev_fsm_len = ARRAY_SIZE(dev_fsm); 2297 2298 /* --- This is the END my friend --- */ 2299 2300