1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2004, 2007 4 * Authors: Belinda Thompson (belindat@us.ibm.com) 5 * Andy Richter (richtera@us.ibm.com) 6 * Peter Tiedemann (ptiedem@de.ibm.com) 7 */ 8 9 /* 10 This module exports functions to be used by CCS: 11 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 12 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 13 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 14 EXPORT_SYMBOL(ctc_mpc_flow_control); 15 */ 16 17 #undef DEBUG 18 #undef DEBUGDATA 19 #undef DEBUGCCW 20 21 #define KMSG_COMPONENT "ctcm" 22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/slab.h> 28 #include <linux/errno.h> 29 #include <linux/types.h> 30 #include <linux/interrupt.h> 31 #include <linux/timer.h> 32 #include <linux/sched.h> 33 34 #include <linux/signal.h> 35 #include <linux/string.h> 36 #include <linux/proc_fs.h> 37 38 #include <linux/ip.h> 39 #include <linux/if_arp.h> 40 #include <linux/tcp.h> 41 #include <linux/skbuff.h> 42 #include <linux/ctype.h> 43 #include <linux/netdevice.h> 44 #include <net/dst.h> 45 46 #include <linux/io.h> /* instead of <asm/io.h> ok ? */ 47 #include <asm/ccwdev.h> 48 #include <asm/ccwgroup.h> 49 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */ 50 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */ 51 #include <linux/wait.h> 52 #include <linux/moduleparam.h> 53 #include <asm/idals.h> 54 55 #include "ctcm_main.h" 56 #include "ctcm_mpc.h" 57 #include "ctcm_fsms.h" 58 59 static const struct xid2 init_xid = { 60 .xid2_type_id = XID_FM2, 61 .xid2_len = 0x45, 62 .xid2_adj_id = 0, 63 .xid2_rlen = 0x31, 64 .xid2_resv1 = 0, 65 .xid2_flag1 = 0, 66 .xid2_fmtt = 0, 67 .xid2_flag4 = 0x80, 68 .xid2_resv2 = 0, 69 .xid2_tgnum = 0, 70 .xid2_sender_id = 0, 71 .xid2_flag2 = 0, 72 .xid2_option = XID2_0, 73 .xid2_resv3 = "\x00", 74 .xid2_resv4 = 0, 75 .xid2_dlc_type = XID2_READ_SIDE, 76 .xid2_resv5 = 0, 77 .xid2_mpc_flag = 0, 78 .xid2_resv6 = 0, 79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), 80 }; 81 82 static const struct th_header thnorm = { 83 .th_seg = 0x00, 84 .th_ch_flag = TH_IS_XID, 85 .th_blk_flag = TH_DATA_IS_XID, 86 .th_is_xid = 0x01, 87 .th_seq_num = 0x00000000, 88 }; 89 90 static const struct th_header thdummy = { 91 .th_seg = 0x00, 92 .th_ch_flag = 0x00, 93 .th_blk_flag = TH_DATA_IS_XID, 94 .th_is_xid = 0x01, 95 .th_seq_num = 0x00000000, 96 }; 97 98 /* 99 * Definition of one MPC group 100 */ 101 102 /* 103 * Compatibility macros for busy handling 104 * of network devices. 105 */ 106 107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 108 109 /* 110 * MPC Group state machine actions (static prototypes) 111 */ 112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 116 static int mpc_validate_xid(struct mpcg_info *mpcginfo); 117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 123 124 #ifdef DEBUGDATA 125 /*-------------------------------------------------------------------* 126 * Dump buffer format * 127 * * 128 *--------------------------------------------------------------------*/ 129 void ctcmpc_dumpit(char *buf, int len) 130 { 131 __u32 ct, sw, rm, dup; 132 char *ptr, *rptr; 133 char tbuf[82], tdup[82]; 134 char addr[22]; 135 char boff[12]; 136 char bhex[82], duphex[82]; 137 char basc[40]; 138 139 sw = 0; 140 rptr = ptr = buf; 141 rm = 16; 142 duphex[0] = 0x00; 143 dup = 0; 144 145 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 146 if (sw == 0) { 147 sprintf(addr, "%16.16llx", (__u64)rptr); 148 149 sprintf(boff, "%4.4X", (__u32)ct); 150 bhex[0] = '\0'; 151 basc[0] = '\0'; 152 } 153 if ((sw == 4) || (sw == 12)) 154 strcat(bhex, " "); 155 if (sw == 8) 156 strcat(bhex, " "); 157 158 sprintf(tbuf, "%2.2llX", (__u64)*ptr); 159 160 tbuf[2] = '\0'; 161 strcat(bhex, tbuf); 162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 163 basc[sw] = *ptr; 164 else 165 basc[sw] = '.'; 166 167 basc[sw+1] = '\0'; 168 sw++; 169 rm--; 170 if (sw != 16) 171 continue; 172 if ((strcmp(duphex, bhex)) != 0) { 173 if (dup != 0) { 174 sprintf(tdup, 175 "Duplicate as above to %s", addr); 176 ctcm_pr_debug(" --- %s ---\n", 177 tdup); 178 } 179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 180 addr, boff, bhex, basc); 181 dup = 0; 182 strcpy(duphex, bhex); 183 } else 184 dup++; 185 186 sw = 0; 187 rm = 16; 188 } /* endfor */ 189 190 if (sw != 0) { 191 for ( ; rm > 0; rm--, sw++) { 192 if ((sw == 4) || (sw == 12)) 193 strcat(bhex, " "); 194 if (sw == 8) 195 strcat(bhex, " "); 196 strcat(bhex, " "); 197 strcat(basc, " "); 198 } 199 if (dup != 0) { 200 sprintf(tdup, "Duplicate as above to %s", addr); 201 ctcm_pr_debug(" --- %s ---\n", tdup); 202 } 203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 204 addr, boff, bhex, basc); 205 } else { 206 if (dup >= 1) { 207 sprintf(tdup, "Duplicate as above to %s", addr); 208 ctcm_pr_debug(" --- %s ---\n", tdup); 209 } 210 if (dup != 0) { 211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 212 addr, boff, bhex, basc); 213 } 214 } 215 216 return; 217 218 } /* end of ctcmpc_dumpit */ 219 #endif 220 221 #ifdef DEBUGDATA 222 /* 223 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 224 * 225 * skb The sk_buff to dump. 226 * offset Offset relative to skb-data, where to start the dump. 227 */ 228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 229 { 230 __u8 *p = skb->data; 231 struct th_header *header; 232 struct pdu *pheader; 233 int bl = skb->len; 234 int i; 235 236 if (p == NULL) 237 return; 238 239 p += offset; 240 header = (struct th_header *)p; 241 242 ctcm_pr_debug("dump:\n"); 243 ctcm_pr_debug("skb len=%d \n", skb->len); 244 if (skb->len > 2) { 245 switch (header->th_ch_flag) { 246 case TH_HAS_PDU: 247 break; 248 case 0x00: 249 case TH_IS_XID: 250 if ((header->th_blk_flag == TH_DATA_IS_XID) && 251 (header->th_is_xid == 0x01)) 252 goto dumpth; 253 case TH_SWEEP_REQ: 254 goto dumpth; 255 case TH_SWEEP_RESP: 256 goto dumpth; 257 default: 258 break; 259 } 260 261 pheader = (struct pdu *)p; 262 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 263 pheader->pdu_offset, pheader->pdu_offset); 264 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 265 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 266 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 267 goto dumpdata; 268 269 dumpth: 270 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 271 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 272 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 273 ctcm_pr_debug("th->type : %s\n", 274 (header->th_is_xid) ? "DATA" : "XID"); 275 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 276 277 } 278 dumpdata: 279 if (bl > 32) 280 bl = 32; 281 ctcm_pr_debug("data: "); 282 for (i = 0; i < bl; i++) 283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 284 ctcm_pr_debug("\n"); 285 } 286 #endif 287 288 static struct net_device *ctcmpc_get_dev(int port_num) 289 { 290 char device[20]; 291 struct net_device *dev; 292 struct ctcm_priv *priv; 293 294 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 295 296 dev = __dev_get_by_name(&init_net, device); 297 298 if (dev == NULL) { 299 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 300 "%s: Device not found by name: %s", 301 CTCM_FUNTAIL, device); 302 return NULL; 303 } 304 priv = dev->ml_priv; 305 if (priv == NULL) { 306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 307 "%s(%s): dev->ml_priv is NULL", 308 CTCM_FUNTAIL, device); 309 return NULL; 310 } 311 if (priv->mpcg == NULL) { 312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 313 "%s(%s): priv->mpcg is NULL", 314 CTCM_FUNTAIL, device); 315 return NULL; 316 } 317 return dev; 318 } 319 320 /* 321 * ctc_mpc_alloc_channel 322 * (exported interface) 323 * 324 * Device Initialization : 325 * ACTPATH driven IO operations 326 */ 327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 328 { 329 struct net_device *dev; 330 struct mpc_group *grp; 331 struct ctcm_priv *priv; 332 333 dev = ctcmpc_get_dev(port_num); 334 if (dev == NULL) 335 return 1; 336 priv = dev->ml_priv; 337 grp = priv->mpcg; 338 339 grp->allochanfunc = callback; 340 grp->port_num = port_num; 341 grp->port_persist = 1; 342 343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 344 "%s(%s): state=%s", 345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 346 347 switch (fsm_getstate(grp->fsm)) { 348 case MPCG_STATE_INOP: 349 /* Group is in the process of terminating */ 350 grp->alloc_called = 1; 351 break; 352 case MPCG_STATE_RESET: 353 /* MPC Group will transition to state */ 354 /* MPCG_STATE_XID2INITW iff the minimum number */ 355 /* of 1 read and 1 write channel have successfully*/ 356 /* activated */ 357 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 358 if (callback) 359 grp->send_qllc_disc = 1; 360 case MPCG_STATE_XID0IOWAIT: 361 fsm_deltimer(&grp->timer); 362 grp->outstanding_xid2 = 0; 363 grp->outstanding_xid7 = 0; 364 grp->outstanding_xid7_p2 = 0; 365 grp->saved_xid2 = NULL; 366 if (callback) 367 ctcm_open(dev); 368 fsm_event(priv->fsm, DEV_EVENT_START, dev); 369 break; 370 case MPCG_STATE_READY: 371 /* XID exchanges completed after PORT was activated */ 372 /* Link station already active */ 373 /* Maybe timing issue...retry callback */ 374 grp->allocchan_callback_retries++; 375 if (grp->allocchan_callback_retries < 4) { 376 if (grp->allochanfunc) 377 grp->allochanfunc(grp->port_num, 378 grp->group_max_buflen); 379 } else { 380 /* there are problems...bail out */ 381 /* there may be a state mismatch so restart */ 382 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 383 grp->allocchan_callback_retries = 0; 384 } 385 break; 386 } 387 388 return 0; 389 } 390 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 391 392 /* 393 * ctc_mpc_establish_connectivity 394 * (exported interface) 395 */ 396 void ctc_mpc_establish_connectivity(int port_num, 397 void (*callback)(int, int, int)) 398 { 399 struct net_device *dev; 400 struct mpc_group *grp; 401 struct ctcm_priv *priv; 402 struct channel *rch, *wch; 403 404 dev = ctcmpc_get_dev(port_num); 405 if (dev == NULL) 406 return; 407 priv = dev->ml_priv; 408 grp = priv->mpcg; 409 rch = priv->channel[CTCM_READ]; 410 wch = priv->channel[CTCM_WRITE]; 411 412 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 413 "%s(%s): state=%s", 414 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 415 416 grp->estconnfunc = callback; 417 grp->port_num = port_num; 418 419 switch (fsm_getstate(grp->fsm)) { 420 case MPCG_STATE_READY: 421 /* XID exchanges completed after PORT was activated */ 422 /* Link station already active */ 423 /* Maybe timing issue...retry callback */ 424 fsm_deltimer(&grp->timer); 425 grp->estconn_callback_retries++; 426 if (grp->estconn_callback_retries < 4) { 427 if (grp->estconnfunc) { 428 grp->estconnfunc(grp->port_num, 0, 429 grp->group_max_buflen); 430 grp->estconnfunc = NULL; 431 } 432 } else { 433 /* there are problems...bail out */ 434 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 435 grp->estconn_callback_retries = 0; 436 } 437 break; 438 case MPCG_STATE_INOP: 439 case MPCG_STATE_RESET: 440 /* MPC Group is not ready to start XID - min num of */ 441 /* 1 read and 1 write channel have not been acquired*/ 442 443 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 444 "%s(%s): REJECTED - inactive channels", 445 CTCM_FUNTAIL, dev->name); 446 if (grp->estconnfunc) { 447 grp->estconnfunc(grp->port_num, -1, 0); 448 grp->estconnfunc = NULL; 449 } 450 break; 451 case MPCG_STATE_XID2INITW: 452 /* alloc channel was called but no XID exchange */ 453 /* has occurred. initiate xside XID exchange */ 454 /* make sure yside XID0 processing has not started */ 455 456 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 457 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 458 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 459 "%s(%s): ABORT - PASSIVE XID", 460 CTCM_FUNTAIL, dev->name); 461 break; 462 } 463 grp->send_qllc_disc = 1; 464 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 465 fsm_deltimer(&grp->timer); 466 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 467 MPCG_EVENT_TIMER, dev); 468 grp->outstanding_xid7 = 0; 469 grp->outstanding_xid7_p2 = 0; 470 grp->saved_xid2 = NULL; 471 if ((rch->in_mpcgroup) && 472 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 473 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 474 else { 475 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 476 "%s(%s): RX-%s not ready for ACTIVE XID0", 477 CTCM_FUNTAIL, dev->name, rch->id); 478 if (grp->estconnfunc) { 479 grp->estconnfunc(grp->port_num, -1, 0); 480 grp->estconnfunc = NULL; 481 } 482 fsm_deltimer(&grp->timer); 483 goto done; 484 } 485 if ((wch->in_mpcgroup) && 486 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 487 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 488 else { 489 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 490 "%s(%s): WX-%s not ready for ACTIVE XID0", 491 CTCM_FUNTAIL, dev->name, wch->id); 492 if (grp->estconnfunc) { 493 grp->estconnfunc(grp->port_num, -1, 0); 494 grp->estconnfunc = NULL; 495 } 496 fsm_deltimer(&grp->timer); 497 goto done; 498 } 499 break; 500 case MPCG_STATE_XID0IOWAIT: 501 /* already in active XID negotiations */ 502 default: 503 break; 504 } 505 506 done: 507 CTCM_PR_DEBUG("Exit %s()\n", __func__); 508 return; 509 } 510 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 511 512 /* 513 * ctc_mpc_dealloc_ch 514 * (exported interface) 515 */ 516 void ctc_mpc_dealloc_ch(int port_num) 517 { 518 struct net_device *dev; 519 struct ctcm_priv *priv; 520 struct mpc_group *grp; 521 522 dev = ctcmpc_get_dev(port_num); 523 if (dev == NULL) 524 return; 525 priv = dev->ml_priv; 526 grp = priv->mpcg; 527 528 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 529 "%s: %s: refcount = %d\n", 530 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 531 532 fsm_deltimer(&priv->restart_timer); 533 grp->channels_terminating = 0; 534 fsm_deltimer(&grp->timer); 535 grp->allochanfunc = NULL; 536 grp->estconnfunc = NULL; 537 grp->port_persist = 0; 538 grp->send_qllc_disc = 0; 539 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 540 541 ctcm_close(dev); 542 return; 543 } 544 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 545 546 /* 547 * ctc_mpc_flow_control 548 * (exported interface) 549 */ 550 void ctc_mpc_flow_control(int port_num, int flowc) 551 { 552 struct ctcm_priv *priv; 553 struct mpc_group *grp; 554 struct net_device *dev; 555 struct channel *rch; 556 int mpcg_state; 557 558 dev = ctcmpc_get_dev(port_num); 559 if (dev == NULL) 560 return; 561 priv = dev->ml_priv; 562 grp = priv->mpcg; 563 564 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 565 "%s: %s: flowc = %d", 566 CTCM_FUNTAIL, dev->name, flowc); 567 568 rch = priv->channel[CTCM_READ]; 569 570 mpcg_state = fsm_getstate(grp->fsm); 571 switch (flowc) { 572 case 1: 573 if (mpcg_state == MPCG_STATE_FLOWC) 574 break; 575 if (mpcg_state == MPCG_STATE_READY) { 576 if (grp->flow_off_called == 1) 577 grp->flow_off_called = 0; 578 else 579 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 580 break; 581 } 582 break; 583 case 0: 584 if (mpcg_state == MPCG_STATE_FLOWC) { 585 fsm_newstate(grp->fsm, MPCG_STATE_READY); 586 /* ensure any data that has accumulated */ 587 /* on the io_queue will now be sen t */ 588 tasklet_schedule(&rch->ch_tasklet); 589 } 590 /* possible race condition */ 591 if (mpcg_state == MPCG_STATE_READY) { 592 grp->flow_off_called = 1; 593 break; 594 } 595 break; 596 } 597 598 } 599 EXPORT_SYMBOL(ctc_mpc_flow_control); 600 601 static int mpc_send_qllc_discontact(struct net_device *); 602 603 /* 604 * helper function of ctcmpc_unpack_skb 605 */ 606 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 607 { 608 struct channel *rch = mpcginfo->ch; 609 struct net_device *dev = rch->netdev; 610 struct ctcm_priv *priv = dev->ml_priv; 611 struct mpc_group *grp = priv->mpcg; 612 struct channel *ch = priv->channel[CTCM_WRITE]; 613 614 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 615 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 616 617 grp->sweep_rsp_pend_num--; 618 619 if ((grp->sweep_req_pend_num == 0) && 620 (grp->sweep_rsp_pend_num == 0)) { 621 fsm_deltimer(&ch->sweep_timer); 622 grp->in_sweep = 0; 623 rch->th_seq_num = 0x00; 624 ch->th_seq_num = 0x00; 625 ctcm_clear_busy_do(dev); 626 } 627 628 kfree(mpcginfo); 629 630 return; 631 632 } 633 634 /* 635 * helper function of mpc_rcvd_sweep_req 636 * which is a helper of ctcmpc_unpack_skb 637 */ 638 static void ctcmpc_send_sweep_resp(struct channel *rch) 639 { 640 struct net_device *dev = rch->netdev; 641 struct ctcm_priv *priv = dev->ml_priv; 642 struct mpc_group *grp = priv->mpcg; 643 struct th_sweep *header; 644 struct sk_buff *sweep_skb; 645 struct channel *ch = priv->channel[CTCM_WRITE]; 646 647 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 648 649 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 650 if (sweep_skb == NULL) { 651 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 652 "%s(%s): sweep_skb allocation ERROR\n", 653 CTCM_FUNTAIL, rch->id); 654 goto done; 655 } 656 657 header = kmalloc(sizeof(struct th_sweep), gfp_type()); 658 659 if (!header) { 660 dev_kfree_skb_any(sweep_skb); 661 goto done; 662 } 663 664 header->th.th_seg = 0x00 ; 665 header->th.th_ch_flag = TH_SWEEP_RESP; 666 header->th.th_blk_flag = 0x00; 667 header->th.th_is_xid = 0x00; 668 header->th.th_seq_num = 0x00; 669 header->sw.th_last_seq = ch->th_seq_num; 670 671 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 672 673 kfree(header); 674 675 netif_trans_update(dev); 676 skb_queue_tail(&ch->sweep_queue, sweep_skb); 677 678 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 679 680 return; 681 682 done: 683 grp->in_sweep = 0; 684 ctcm_clear_busy_do(dev); 685 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 686 687 return; 688 } 689 690 /* 691 * helper function of ctcmpc_unpack_skb 692 */ 693 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 694 { 695 struct channel *rch = mpcginfo->ch; 696 struct net_device *dev = rch->netdev; 697 struct ctcm_priv *priv = dev->ml_priv; 698 struct mpc_group *grp = priv->mpcg; 699 struct channel *ch = priv->channel[CTCM_WRITE]; 700 701 if (do_debug) 702 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 703 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 704 705 if (grp->in_sweep == 0) { 706 grp->in_sweep = 1; 707 ctcm_test_and_set_busy(dev); 708 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 709 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 710 } 711 712 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 713 714 grp->sweep_req_pend_num--; 715 ctcmpc_send_sweep_resp(ch); 716 kfree(mpcginfo); 717 return; 718 } 719 720 /* 721 * MPC Group Station FSM definitions 722 */ 723 static const char *mpcg_event_names[] = { 724 [MPCG_EVENT_INOP] = "INOP Condition", 725 [MPCG_EVENT_DISCONC] = "Discontact Received", 726 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 727 [MPCG_EVENT_XID2] = "XID2 Received", 728 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 729 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 730 [MPCG_EVENT_TIMER] = "XID Setup Timer", 731 [MPCG_EVENT_DOIO] = "XID DoIO", 732 }; 733 734 static const char *mpcg_state_names[] = { 735 [MPCG_STATE_RESET] = "Reset", 736 [MPCG_STATE_INOP] = "INOP", 737 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 738 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 739 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 740 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 741 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 742 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 743 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 744 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 745 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 746 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 747 [MPCG_STATE_READY] = "READY", 748 }; 749 750 /* 751 * The MPC Group Station FSM 752 * 22 events 753 */ 754 static const fsm_node mpcg_fsm[] = { 755 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 756 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 757 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 758 759 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 760 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 761 762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 763 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 764 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 765 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 766 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 767 768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 769 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 770 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 771 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 772 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 773 774 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 775 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 776 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 777 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 778 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 779 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 780 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 781 782 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 783 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 784 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 785 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 786 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 787 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 788 789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 794 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 795 796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 801 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 802 803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 804 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 805 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 806 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 807 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 808 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 809 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 810 811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 816 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 817 818 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 819 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 820 }; 821 822 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 823 824 /* 825 * MPC Group Station FSM action 826 * CTCM_PROTO_MPC only 827 */ 828 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 829 { 830 struct net_device *dev = arg; 831 struct ctcm_priv *priv = dev->ml_priv; 832 struct mpc_group *grp = priv->mpcg; 833 834 if (grp == NULL) { 835 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 836 "%s(%s): No MPC group", 837 CTCM_FUNTAIL, dev->name); 838 return; 839 } 840 841 fsm_deltimer(&grp->timer); 842 843 if (grp->saved_xid2->xid2_flag2 == 0x40) { 844 priv->xid->xid2_flag2 = 0x00; 845 if (grp->estconnfunc) { 846 grp->estconnfunc(grp->port_num, 1, 847 grp->group_max_buflen); 848 grp->estconnfunc = NULL; 849 } else if (grp->allochanfunc) 850 grp->send_qllc_disc = 1; 851 852 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 854 "%s(%s): fails", 855 CTCM_FUNTAIL, dev->name); 856 return; 857 } 858 859 grp->port_persist = 1; 860 grp->out_of_sequence = 0; 861 grp->estconn_called = 0; 862 863 tasklet_hi_schedule(&grp->mpc_tasklet2); 864 865 return; 866 } 867 868 /* 869 * helper of ctcm_init_netdevice 870 * CTCM_PROTO_MPC only 871 */ 872 void mpc_group_ready(unsigned long adev) 873 { 874 struct net_device *dev = (struct net_device *)adev; 875 struct ctcm_priv *priv = dev->ml_priv; 876 struct mpc_group *grp = priv->mpcg; 877 struct channel *ch = NULL; 878 879 if (grp == NULL) { 880 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 881 "%s(%s): No MPC group", 882 CTCM_FUNTAIL, dev->name); 883 return; 884 } 885 886 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 887 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 888 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 889 890 fsm_newstate(grp->fsm, MPCG_STATE_READY); 891 892 /* Put up a read on the channel */ 893 ch = priv->channel[CTCM_READ]; 894 ch->pdu_seq = 0; 895 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 896 __func__, ch->pdu_seq); 897 898 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 899 /* Put the write channel in idle state */ 900 ch = priv->channel[CTCM_WRITE]; 901 if (ch->collect_len > 0) { 902 spin_lock(&ch->collect_lock); 903 ctcm_purge_skb_queue(&ch->collect_queue); 904 ch->collect_len = 0; 905 spin_unlock(&ch->collect_lock); 906 } 907 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 908 ctcm_clear_busy(dev); 909 910 if (grp->estconnfunc) { 911 grp->estconnfunc(grp->port_num, 0, 912 grp->group_max_buflen); 913 grp->estconnfunc = NULL; 914 } else if (grp->allochanfunc) 915 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 916 917 grp->send_qllc_disc = 1; 918 grp->changed_side = 0; 919 920 return; 921 922 } 923 924 /* 925 * Increment the MPC Group Active Channel Counts 926 * helper of dev_action (called from channel fsm) 927 */ 928 void mpc_channel_action(struct channel *ch, int direction, int action) 929 { 930 struct net_device *dev = ch->netdev; 931 struct ctcm_priv *priv = dev->ml_priv; 932 struct mpc_group *grp = priv->mpcg; 933 934 if (grp == NULL) { 935 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 936 "%s(%s): No MPC group", 937 CTCM_FUNTAIL, dev->name); 938 return; 939 } 940 941 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 942 943 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 944 "%s: %i / Grp:%s total_channels=%i, active_channels: " 945 "read=%i, write=%i\n", __func__, action, 946 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 947 grp->active_channels[CTCM_READ], 948 grp->active_channels[CTCM_WRITE]); 949 950 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 951 grp->num_channel_paths++; 952 grp->active_channels[direction]++; 953 grp->outstanding_xid2++; 954 ch->in_mpcgroup = 1; 955 956 if (ch->xid_skb != NULL) 957 dev_kfree_skb_any(ch->xid_skb); 958 959 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 960 GFP_ATOMIC | GFP_DMA); 961 if (ch->xid_skb == NULL) { 962 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 963 "%s(%s): Couldn't alloc ch xid_skb\n", 964 CTCM_FUNTAIL, dev->name); 965 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 966 return; 967 } 968 ch->xid_skb_data = ch->xid_skb->data; 969 ch->xid_th = (struct th_header *)ch->xid_skb->data; 970 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 971 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 972 skb_put(ch->xid_skb, XID2_LENGTH); 973 ch->xid_id = skb_tail_pointer(ch->xid_skb); 974 ch->xid_skb->data = ch->xid_skb_data; 975 skb_reset_tail_pointer(ch->xid_skb); 976 ch->xid_skb->len = 0; 977 978 skb_put_data(ch->xid_skb, grp->xid_skb->data, 979 grp->xid_skb->len); 980 981 ch->xid->xid2_dlc_type = 982 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 983 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 984 985 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 986 ch->xid->xid2_buf_len = 0x00; 987 988 ch->xid_skb->data = ch->xid_skb_data; 989 skb_reset_tail_pointer(ch->xid_skb); 990 ch->xid_skb->len = 0; 991 992 fsm_newstate(ch->fsm, CH_XID0_PENDING); 993 994 if ((grp->active_channels[CTCM_READ] > 0) && 995 (grp->active_channels[CTCM_WRITE] > 0) && 996 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 997 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 998 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 999 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1000 __func__, dev->name); 1001 } 1002 } else if ((action == MPC_CHANNEL_REMOVE) && 1003 (ch->in_mpcgroup == 1)) { 1004 ch->in_mpcgroup = 0; 1005 grp->num_channel_paths--; 1006 grp->active_channels[direction]--; 1007 1008 if (ch->xid_skb != NULL) 1009 dev_kfree_skb_any(ch->xid_skb); 1010 ch->xid_skb = NULL; 1011 1012 if (grp->channels_terminating) 1013 goto done; 1014 1015 if (((grp->active_channels[CTCM_READ] == 0) && 1016 (grp->active_channels[CTCM_WRITE] > 0)) 1017 || ((grp->active_channels[CTCM_WRITE] == 0) && 1018 (grp->active_channels[CTCM_READ] > 0))) 1019 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1020 } 1021 done: 1022 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1023 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1024 "read=%i, write=%i\n", __func__, action, 1025 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1026 grp->active_channels[CTCM_READ], 1027 grp->active_channels[CTCM_WRITE]); 1028 1029 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1030 } 1031 1032 /** 1033 * Unpack a just received skb and hand it over to 1034 * upper layers. 1035 * special MPC version of unpack_skb. 1036 * 1037 * ch The channel where this skb has been received. 1038 * pskb The received skb. 1039 */ 1040 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1041 { 1042 struct net_device *dev = ch->netdev; 1043 struct ctcm_priv *priv = dev->ml_priv; 1044 struct mpc_group *grp = priv->mpcg; 1045 struct pdu *curr_pdu; 1046 struct mpcg_info *mpcginfo; 1047 struct th_header *header = NULL; 1048 struct th_sweep *sweep = NULL; 1049 int pdu_last_seen = 0; 1050 __u32 new_len; 1051 struct sk_buff *skb; 1052 int skblen; 1053 int sendrc = 0; 1054 1055 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1056 __func__, dev->name, smp_processor_id(), ch->id); 1057 1058 header = (struct th_header *)pskb->data; 1059 if ((header->th_seg == 0) && 1060 (header->th_ch_flag == 0) && 1061 (header->th_blk_flag == 0) && 1062 (header->th_seq_num == 0)) 1063 /* nothing for us */ goto done; 1064 1065 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1066 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1067 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1068 1069 pskb->dev = dev; 1070 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1071 skb_pull(pskb, TH_HEADER_LENGTH); 1072 1073 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1074 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1075 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1076 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1077 (header->th_seq_num != ch->th_seq_num + 1) && 1078 (ch->th_seq_num != 0))) { 1079 /* This is NOT the next segment * 1080 * we are not the correct race winner * 1081 * go away and let someone else win * 1082 * BUT..this only applies if xid negot * 1083 * is done * 1084 */ 1085 grp->out_of_sequence += 1; 1086 __skb_push(pskb, TH_HEADER_LENGTH); 1087 skb_queue_tail(&ch->io_queue, pskb); 1088 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1089 "got:%08x\n", __func__, 1090 ch->th_seq_num + 1, header->th_seq_num); 1091 1092 return; 1093 } 1094 grp->out_of_sequence = 0; 1095 ch->th_seq_num = header->th_seq_num; 1096 1097 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1098 __func__, ch->th_seq_num); 1099 1100 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1101 goto done; 1102 while ((pskb->len > 0) && !pdu_last_seen) { 1103 curr_pdu = (struct pdu *)pskb->data; 1104 1105 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1106 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1107 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1108 __func__, pskb->len); 1109 1110 skb_pull(pskb, PDU_HEADER_LENGTH); 1111 1112 if (curr_pdu->pdu_flag & PDU_LAST) 1113 pdu_last_seen = 1; 1114 if (curr_pdu->pdu_flag & PDU_CNTL) 1115 pskb->protocol = htons(ETH_P_SNAP); 1116 else 1117 pskb->protocol = htons(ETH_P_SNA_DIX); 1118 1119 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1120 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1121 "%s(%s): Dropping packet with " 1122 "illegal siize %d", 1123 CTCM_FUNTAIL, dev->name, pskb->len); 1124 1125 priv->stats.rx_dropped++; 1126 priv->stats.rx_length_errors++; 1127 goto done; 1128 } 1129 skb_reset_mac_header(pskb); 1130 new_len = curr_pdu->pdu_offset; 1131 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1132 __func__, new_len); 1133 if ((new_len == 0) || (new_len > pskb->len)) { 1134 /* should never happen */ 1135 /* pskb len must be hosed...bail out */ 1136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1137 "%s(%s): non valid pdu_offset: %04x", 1138 /* "data may be lost", */ 1139 CTCM_FUNTAIL, dev->name, new_len); 1140 goto done; 1141 } 1142 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1143 1144 if (!skb) { 1145 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1146 "%s(%s): MEMORY allocation error", 1147 CTCM_FUNTAIL, dev->name); 1148 priv->stats.rx_dropped++; 1149 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1150 goto done; 1151 } 1152 skb_put_data(skb, pskb->data, new_len); 1153 1154 skb_reset_mac_header(skb); 1155 skb->dev = pskb->dev; 1156 skb->protocol = pskb->protocol; 1157 skb->ip_summed = CHECKSUM_UNNECESSARY; 1158 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1159 ch->pdu_seq++; 1160 1161 if (do_debug_data) { 1162 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1163 __func__, ch->pdu_seq); 1164 ctcm_pr_debug("%s: skb:%0lx " 1165 "skb len: %d \n", __func__, 1166 (unsigned long)skb, skb->len); 1167 ctcm_pr_debug("%s: up to 32 bytes " 1168 "of pdu_data sent\n", __func__); 1169 ctcmpc_dump32((char *)skb->data, skb->len); 1170 } 1171 1172 skblen = skb->len; 1173 sendrc = netif_rx(skb); 1174 priv->stats.rx_packets++; 1175 priv->stats.rx_bytes += skblen; 1176 skb_pull(pskb, new_len); /* point to next PDU */ 1177 } 1178 } else { 1179 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1180 if (mpcginfo == NULL) 1181 goto done; 1182 1183 mpcginfo->ch = ch; 1184 mpcginfo->th = header; 1185 mpcginfo->skb = pskb; 1186 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1187 __func__); 1188 /* it's a sweep? */ 1189 sweep = (struct th_sweep *)pskb->data; 1190 mpcginfo->sweep = sweep; 1191 if (header->th_ch_flag == TH_SWEEP_REQ) 1192 mpc_rcvd_sweep_req(mpcginfo); 1193 else if (header->th_ch_flag == TH_SWEEP_RESP) 1194 mpc_rcvd_sweep_resp(mpcginfo); 1195 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1196 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1197 skb_pull(pskb, XID2_LENGTH); 1198 mpcginfo->xid = thisxid; 1199 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1200 } else if (header->th_blk_flag == TH_DISCONTACT) 1201 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1202 else if (header->th_seq_num != 0) { 1203 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1204 "%s(%s): control pkt expected\n", 1205 CTCM_FUNTAIL, dev->name); 1206 priv->stats.rx_dropped++; 1207 /* mpcginfo only used for non-data transfers */ 1208 kfree(mpcginfo); 1209 if (do_debug_data) 1210 ctcmpc_dump_skb(pskb, -8); 1211 } 1212 } 1213 done: 1214 1215 dev_kfree_skb_any(pskb); 1216 if (sendrc == NET_RX_DROP) { 1217 dev_warn(&dev->dev, 1218 "The network backlog for %s is exceeded, " 1219 "package dropped\n", __func__); 1220 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1221 } 1222 1223 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1224 __func__, dev->name, ch, ch->id); 1225 } 1226 1227 /** 1228 * tasklet helper for mpc's skb unpacking. 1229 * 1230 * ch The channel to work on. 1231 * Allow flow control back pressure to occur here. 1232 * Throttling back channel can result in excessive 1233 * channel inactivity and system deact of channel 1234 */ 1235 void ctcmpc_bh(unsigned long thischan) 1236 { 1237 struct channel *ch = (struct channel *)thischan; 1238 struct sk_buff *skb; 1239 struct net_device *dev = ch->netdev; 1240 struct ctcm_priv *priv = dev->ml_priv; 1241 struct mpc_group *grp = priv->mpcg; 1242 1243 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1244 dev->name, smp_processor_id(), __func__, ch->id); 1245 /* caller has requested driver to throttle back */ 1246 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1247 (skb = skb_dequeue(&ch->io_queue))) { 1248 ctcmpc_unpack_skb(ch, skb); 1249 if (grp->out_of_sequence > 20) { 1250 /* assume data loss has occurred if */ 1251 /* missing seq_num for extended */ 1252 /* period of time */ 1253 grp->out_of_sequence = 0; 1254 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1255 break; 1256 } 1257 if (skb == skb_peek(&ch->io_queue)) 1258 break; 1259 } 1260 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1261 __func__, dev->name, ch, ch->id); 1262 return; 1263 } 1264 1265 /* 1266 * MPC Group Initializations 1267 */ 1268 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1269 { 1270 struct mpc_group *grp; 1271 1272 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1273 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1274 1275 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1276 if (grp == NULL) 1277 return NULL; 1278 1279 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1280 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1281 mpcg_fsm_len, GFP_KERNEL); 1282 if (grp->fsm == NULL) { 1283 kfree(grp); 1284 return NULL; 1285 } 1286 1287 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1288 fsm_settimer(grp->fsm, &grp->timer); 1289 1290 grp->xid_skb = 1291 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1292 if (grp->xid_skb == NULL) { 1293 kfree_fsm(grp->fsm); 1294 kfree(grp); 1295 return NULL; 1296 } 1297 /* base xid for all channels in group */ 1298 grp->xid_skb_data = grp->xid_skb->data; 1299 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1300 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1301 1302 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1303 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1304 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1305 grp->xid->xid2_sender_id = jiffies; 1306 1307 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1308 skb_put_data(grp->xid_skb, "VTAM", 4); 1309 1310 grp->rcvd_xid_skb = 1311 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1312 if (grp->rcvd_xid_skb == NULL) { 1313 kfree_fsm(grp->fsm); 1314 dev_kfree_skb(grp->xid_skb); 1315 kfree(grp); 1316 return NULL; 1317 } 1318 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1319 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1320 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1321 grp->saved_xid2 = NULL; 1322 priv->xid = grp->xid; 1323 priv->mpcg = grp; 1324 return grp; 1325 } 1326 1327 /* 1328 * The MPC Group Station FSM 1329 */ 1330 1331 /* 1332 * MPC Group Station FSM actions 1333 * CTCM_PROTO_MPC only 1334 */ 1335 1336 /** 1337 * NOP action for statemachines 1338 */ 1339 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1340 { 1341 } 1342 1343 /* 1344 * invoked when the device transitions to dev_stopped 1345 * MPC will stop each individual channel if a single XID failure 1346 * occurs, or will intitiate all channels be stopped if a GROUP 1347 * level failure occurs. 1348 */ 1349 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1350 { 1351 struct net_device *dev = arg; 1352 struct ctcm_priv *priv; 1353 struct mpc_group *grp; 1354 struct channel *wch; 1355 1356 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1357 1358 priv = dev->ml_priv; 1359 grp = priv->mpcg; 1360 grp->flow_off_called = 0; 1361 fsm_deltimer(&grp->timer); 1362 if (grp->channels_terminating) 1363 return; 1364 1365 grp->channels_terminating = 1; 1366 grp->saved_state = fsm_getstate(grp->fsm); 1367 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1368 if (grp->saved_state > MPCG_STATE_XID7INITF) 1369 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1370 "%s(%s): MPC GROUP INOPERATIVE", 1371 CTCM_FUNTAIL, dev->name); 1372 if ((grp->saved_state != MPCG_STATE_RESET) || 1373 /* dealloc_channel has been called */ 1374 (grp->port_persist == 0)) 1375 fsm_deltimer(&priv->restart_timer); 1376 1377 wch = priv->channel[CTCM_WRITE]; 1378 1379 switch (grp->saved_state) { 1380 case MPCG_STATE_RESET: 1381 case MPCG_STATE_INOP: 1382 case MPCG_STATE_XID2INITW: 1383 case MPCG_STATE_XID0IOWAIT: 1384 case MPCG_STATE_XID2INITX: 1385 case MPCG_STATE_XID7INITW: 1386 case MPCG_STATE_XID7INITX: 1387 case MPCG_STATE_XID0IOWAIX: 1388 case MPCG_STATE_XID7INITI: 1389 case MPCG_STATE_XID7INITZ: 1390 case MPCG_STATE_XID7INITF: 1391 break; 1392 case MPCG_STATE_FLOWC: 1393 case MPCG_STATE_READY: 1394 default: 1395 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1396 } 1397 1398 grp->xid2_tgnum = 0; 1399 grp->group_max_buflen = 0; /*min of all received */ 1400 grp->outstanding_xid2 = 0; 1401 grp->outstanding_xid7 = 0; 1402 grp->outstanding_xid7_p2 = 0; 1403 grp->saved_xid2 = NULL; 1404 grp->xidnogood = 0; 1405 grp->changed_side = 0; 1406 1407 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1408 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1409 grp->rcvd_xid_skb->len = 0; 1410 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1411 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1412 1413 if (grp->send_qllc_disc == 1) { 1414 grp->send_qllc_disc = 0; 1415 mpc_send_qllc_discontact(dev); 1416 } 1417 1418 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1419 /* This can result in INOP of VTAM PU due to halting of */ 1420 /* outstanding IO which causes a sense to be returned */ 1421 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1422 /* become unreachable without manual intervention */ 1423 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1424 grp->alloc_called = 0; 1425 fsm_deltimer(&priv->restart_timer); 1426 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1427 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1428 if (grp->saved_state > MPCG_STATE_XID7INITF) 1429 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1430 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1431 CTCM_FUNTAIL, dev->name); 1432 } else { 1433 fsm_deltimer(&priv->restart_timer); 1434 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1435 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1436 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1437 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1438 CTCM_FUNTAIL, dev->name); 1439 } 1440 } 1441 1442 /** 1443 * Handle mpc group action timeout. 1444 * MPC Group Station FSM action 1445 * CTCM_PROTO_MPC only 1446 * 1447 * fi An instance of an mpc_group fsm. 1448 * event The event, just happened. 1449 * arg Generic pointer, casted from net_device * upon call. 1450 */ 1451 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1452 { 1453 struct net_device *dev = arg; 1454 struct ctcm_priv *priv; 1455 struct mpc_group *grp; 1456 struct channel *wch; 1457 struct channel *rch; 1458 1459 priv = dev->ml_priv; 1460 grp = priv->mpcg; 1461 wch = priv->channel[CTCM_WRITE]; 1462 rch = priv->channel[CTCM_READ]; 1463 1464 switch (fsm_getstate(grp->fsm)) { 1465 case MPCG_STATE_XID2INITW: 1466 /* Unless there is outstanding IO on the */ 1467 /* channel just return and wait for ATTN */ 1468 /* interrupt to begin XID negotiations */ 1469 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1470 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1471 break; 1472 default: 1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1474 } 1475 1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1477 "%s: dev=%s exit", 1478 CTCM_FUNTAIL, dev->name); 1479 return; 1480 } 1481 1482 /* 1483 * MPC Group Station FSM action 1484 * CTCM_PROTO_MPC only 1485 */ 1486 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1487 { 1488 struct mpcg_info *mpcginfo = arg; 1489 struct channel *ch = mpcginfo->ch; 1490 struct net_device *dev; 1491 struct ctcm_priv *priv; 1492 struct mpc_group *grp; 1493 1494 if (ch) { 1495 dev = ch->netdev; 1496 if (dev) { 1497 priv = dev->ml_priv; 1498 if (priv) { 1499 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1500 "%s: %s: %s\n", 1501 CTCM_FUNTAIL, dev->name, ch->id); 1502 grp = priv->mpcg; 1503 grp->send_qllc_disc = 1; 1504 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1505 } 1506 } 1507 } 1508 1509 return; 1510 } 1511 1512 /* 1513 * MPC Group Station - not part of FSM 1514 * CTCM_PROTO_MPC only 1515 * called from add_channel in ctcm_main.c 1516 */ 1517 void mpc_action_send_discontact(unsigned long thischan) 1518 { 1519 int rc; 1520 struct channel *ch = (struct channel *)thischan; 1521 unsigned long saveflags = 0; 1522 1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1525 (unsigned long)ch, 0xff, 0); 1526 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1527 1528 if (rc != 0) { 1529 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1530 } 1531 1532 return; 1533 } 1534 1535 1536 /* 1537 * helper function of mpc FSM 1538 * CTCM_PROTO_MPC only 1539 * mpc_action_rcvd_xid7 1540 */ 1541 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1542 { 1543 struct channel *ch = mpcginfo->ch; 1544 struct net_device *dev = ch->netdev; 1545 struct ctcm_priv *priv = dev->ml_priv; 1546 struct mpc_group *grp = priv->mpcg; 1547 struct xid2 *xid = mpcginfo->xid; 1548 int rc = 0; 1549 __u64 our_id = 0; 1550 __u64 their_id = 0; 1551 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1552 1553 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1554 1555 if (xid == NULL) { 1556 rc = 1; 1557 /* XID REJECTED: xid == NULL */ 1558 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1559 "%s(%s): xid = NULL", 1560 CTCM_FUNTAIL, ch->id); 1561 goto done; 1562 } 1563 1564 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1565 1566 /*the received direction should be the opposite of ours */ 1567 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1568 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1569 rc = 2; 1570 /* XID REJECTED: r/w channel pairing mismatch */ 1571 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1572 "%s(%s): r/w channel pairing mismatch", 1573 CTCM_FUNTAIL, ch->id); 1574 goto done; 1575 } 1576 1577 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1578 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1579 grp->group_max_buflen, xid->xid2_buf_len); 1580 1581 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1582 xid->xid2_buf_len - len) 1583 grp->group_max_buflen = xid->xid2_buf_len - len; 1584 } 1585 1586 if (grp->saved_xid2 == NULL) { 1587 grp->saved_xid2 = 1588 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1589 1590 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1591 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1592 1593 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1594 grp->rcvd_xid_skb->len = 0; 1595 1596 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1597 our_id = (__u64)priv->xid->xid2_adj_id; 1598 our_id = our_id << 32; 1599 our_id = our_id + priv->xid->xid2_sender_id; 1600 their_id = (__u64)xid->xid2_adj_id; 1601 their_id = their_id << 32; 1602 their_id = their_id + xid->xid2_sender_id; 1603 /* lower id assume the xside role */ 1604 if (our_id < their_id) { 1605 grp->roll = XSIDE; 1606 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1607 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1608 CTCM_FUNTAIL, ch->id); 1609 } else { 1610 grp->roll = YSIDE; 1611 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1612 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1613 CTCM_FUNTAIL, ch->id); 1614 } 1615 1616 } else { 1617 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1618 rc = 3; 1619 /* XID REJECTED: xid flag byte4 mismatch */ 1620 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1621 "%s(%s): xid flag byte4 mismatch", 1622 CTCM_FUNTAIL, ch->id); 1623 } 1624 if (xid->xid2_flag2 == 0x40) { 1625 rc = 4; 1626 /* XID REJECTED - xid NOGOOD */ 1627 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1628 "%s(%s): xid NOGOOD", 1629 CTCM_FUNTAIL, ch->id); 1630 } 1631 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1632 rc = 5; 1633 /* XID REJECTED - Adjacent Station ID Mismatch */ 1634 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1635 "%s(%s): Adjacent Station ID Mismatch", 1636 CTCM_FUNTAIL, ch->id); 1637 } 1638 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1639 rc = 6; 1640 /* XID REJECTED - Sender Address Mismatch */ 1641 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1642 "%s(%s): Sender Address Mismatch", 1643 CTCM_FUNTAIL, ch->id); 1644 } 1645 } 1646 done: 1647 if (rc) { 1648 dev_warn(&dev->dev, 1649 "The XID used in the MPC protocol is not valid, " 1650 "rc = %d\n", rc); 1651 priv->xid->xid2_flag2 = 0x40; 1652 grp->saved_xid2->xid2_flag2 = 0x40; 1653 } 1654 1655 return rc; 1656 } 1657 1658 /* 1659 * MPC Group Station FSM action 1660 * CTCM_PROTO_MPC only 1661 */ 1662 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1663 { 1664 struct channel *ch = arg; 1665 int rc = 0; 1666 int gotlock = 0; 1667 unsigned long saveflags = 0; /* avoids compiler warning with 1668 spin_unlock_irqrestore */ 1669 1670 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1671 __func__, smp_processor_id(), ch, ch->id); 1672 1673 if (ctcm_checkalloc_buffer(ch)) 1674 goto done; 1675 1676 /* 1677 * skb data-buffer referencing: 1678 */ 1679 ch->trans_skb->data = ch->trans_skb_data; 1680 skb_reset_tail_pointer(ch->trans_skb); 1681 ch->trans_skb->len = 0; 1682 /* result of the previous 3 statements is NOT always 1683 * already set after ctcm_checkalloc_buffer 1684 * because of possible reuse of the trans_skb 1685 */ 1686 memset(ch->trans_skb->data, 0, 16); 1687 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1688 /* check is main purpose here: */ 1689 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1690 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1691 /* check is main purpose here: */ 1692 skb_put(ch->trans_skb, XID2_LENGTH); 1693 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1694 /* cleanup back to startpoint */ 1695 ch->trans_skb->data = ch->trans_skb_data; 1696 skb_reset_tail_pointer(ch->trans_skb); 1697 ch->trans_skb->len = 0; 1698 1699 /* non-checking rewrite of above skb data-buffer referencing: */ 1700 /* 1701 memset(ch->trans_skb->data, 0, 16); 1702 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1703 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1704 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1705 */ 1706 1707 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1708 ch->ccw[8].count = 0; 1709 ch->ccw[8].cda = 0x00; 1710 1711 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1712 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1713 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1714 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1715 1716 if (side == XSIDE) { 1717 /* mpc_action_xside_xid */ 1718 if (ch->xid_th == NULL) 1719 goto done; 1720 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1721 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1722 ch->ccw[9].count = TH_HEADER_LENGTH; 1723 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1724 1725 if (ch->xid == NULL) 1726 goto done; 1727 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1728 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1729 ch->ccw[10].count = XID2_LENGTH; 1730 ch->ccw[10].cda = virt_to_phys(ch->xid); 1731 1732 ch->ccw[11].cmd_code = CCW_CMD_READ; 1733 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1734 ch->ccw[11].count = TH_HEADER_LENGTH; 1735 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1736 1737 ch->ccw[12].cmd_code = CCW_CMD_READ; 1738 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1739 ch->ccw[12].count = XID2_LENGTH; 1740 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1741 1742 ch->ccw[13].cmd_code = CCW_CMD_READ; 1743 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1744 1745 } else { /* side == YSIDE : mpc_action_yside_xid */ 1746 ch->ccw[9].cmd_code = CCW_CMD_READ; 1747 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1748 ch->ccw[9].count = TH_HEADER_LENGTH; 1749 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1750 1751 ch->ccw[10].cmd_code = CCW_CMD_READ; 1752 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1753 ch->ccw[10].count = XID2_LENGTH; 1754 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1755 1756 if (ch->xid_th == NULL) 1757 goto done; 1758 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1759 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1760 ch->ccw[11].count = TH_HEADER_LENGTH; 1761 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1762 1763 if (ch->xid == NULL) 1764 goto done; 1765 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1766 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1767 ch->ccw[12].count = XID2_LENGTH; 1768 ch->ccw[12].cda = virt_to_phys(ch->xid); 1769 1770 if (ch->xid_id == NULL) 1771 goto done; 1772 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1773 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1774 1775 } 1776 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1777 ch->ccw[13].count = 4; 1778 1779 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1780 ch->ccw[14].flags = CCW_FLAG_SLI; 1781 ch->ccw[14].count = 0; 1782 ch->ccw[14].cda = 0; 1783 1784 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1785 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1786 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1787 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1788 1789 if (!in_irq()) { 1790 /* Such conditional locking is a known problem for 1791 * sparse because its static undeterministic. 1792 * Warnings should be ignored here. */ 1793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1794 gotlock = 1; 1795 } 1796 1797 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1798 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1799 (unsigned long)ch, 0xff, 0); 1800 1801 if (gotlock) /* see remark above about conditional locking */ 1802 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1803 1804 if (rc != 0) { 1805 ctcm_ccw_check_rc(ch, rc, 1806 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1807 } 1808 1809 done: 1810 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1811 __func__, ch, ch->id); 1812 return; 1813 1814 } 1815 1816 /* 1817 * MPC Group Station FSM action 1818 * CTCM_PROTO_MPC only 1819 */ 1820 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1821 { 1822 mpc_action_side_xid(fsm, arg, XSIDE); 1823 } 1824 1825 /* 1826 * MPC Group Station FSM action 1827 * CTCM_PROTO_MPC only 1828 */ 1829 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1830 { 1831 mpc_action_side_xid(fsm, arg, YSIDE); 1832 } 1833 1834 /* 1835 * MPC Group Station FSM action 1836 * CTCM_PROTO_MPC only 1837 */ 1838 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1839 { 1840 struct channel *ch = arg; 1841 struct net_device *dev = ch->netdev; 1842 struct ctcm_priv *priv = dev->ml_priv; 1843 struct mpc_group *grp = priv->mpcg; 1844 1845 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1846 __func__, smp_processor_id(), ch, ch->id); 1847 1848 if (ch->xid == NULL) { 1849 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1850 "%s(%s): ch->xid == NULL", 1851 CTCM_FUNTAIL, dev->name); 1852 return; 1853 } 1854 1855 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1856 1857 ch->xid->xid2_option = XID2_0; 1858 1859 switch (fsm_getstate(grp->fsm)) { 1860 case MPCG_STATE_XID2INITW: 1861 case MPCG_STATE_XID2INITX: 1862 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1863 break; 1864 case MPCG_STATE_XID0IOWAIT: 1865 case MPCG_STATE_XID0IOWAIX: 1866 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1867 break; 1868 } 1869 1870 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1871 1872 return; 1873 } 1874 1875 /* 1876 * MPC Group Station FSM action 1877 * CTCM_PROTO_MPC only 1878 */ 1879 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1880 { 1881 struct net_device *dev = arg; 1882 struct ctcm_priv *priv = dev->ml_priv; 1883 struct mpc_group *grp = NULL; 1884 int direction; 1885 int send = 0; 1886 1887 if (priv) 1888 grp = priv->mpcg; 1889 if (grp == NULL) 1890 return; 1891 1892 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1893 struct channel *ch = priv->channel[direction]; 1894 struct xid2 *thisxid = ch->xid; 1895 ch->xid_skb->data = ch->xid_skb_data; 1896 skb_reset_tail_pointer(ch->xid_skb); 1897 ch->xid_skb->len = 0; 1898 thisxid->xid2_option = XID2_7; 1899 send = 0; 1900 1901 /* xid7 phase 1 */ 1902 if (grp->outstanding_xid7_p2 > 0) { 1903 if (grp->roll == YSIDE) { 1904 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1905 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1906 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1907 skb_put_data(ch->xid_skb, &thdummy, 1908 TH_HEADER_LENGTH); 1909 send = 1; 1910 } 1911 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1912 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1913 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1914 skb_put_data(ch->xid_skb, &thnorm, 1915 TH_HEADER_LENGTH); 1916 send = 1; 1917 } 1918 } else { 1919 /* xid7 phase 2 */ 1920 if (grp->roll == YSIDE) { 1921 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1922 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1923 skb_put_data(ch->xid_skb, &thnorm, 1924 TH_HEADER_LENGTH); 1925 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1926 send = 1; 1927 } 1928 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1929 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1930 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1931 skb_put_data(ch->xid_skb, &thdummy, 1932 TH_HEADER_LENGTH); 1933 send = 1; 1934 } 1935 } 1936 1937 if (send) 1938 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1939 } 1940 1941 return; 1942 } 1943 1944 /* 1945 * MPC Group Station FSM action 1946 * CTCM_PROTO_MPC only 1947 */ 1948 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1949 { 1950 1951 struct mpcg_info *mpcginfo = arg; 1952 struct channel *ch = mpcginfo->ch; 1953 struct net_device *dev = ch->netdev; 1954 struct ctcm_priv *priv = dev->ml_priv; 1955 struct mpc_group *grp = priv->mpcg; 1956 1957 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1958 __func__, ch->id, grp->outstanding_xid2, 1959 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1960 1961 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1962 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1963 1964 grp->outstanding_xid2--; 1965 grp->outstanding_xid7++; 1966 grp->outstanding_xid7_p2++; 1967 1968 /* must change state before validating xid to */ 1969 /* properly handle interim interrupts received*/ 1970 switch (fsm_getstate(grp->fsm)) { 1971 case MPCG_STATE_XID2INITW: 1972 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1973 mpc_validate_xid(mpcginfo); 1974 break; 1975 case MPCG_STATE_XID0IOWAIT: 1976 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1977 mpc_validate_xid(mpcginfo); 1978 break; 1979 case MPCG_STATE_XID2INITX: 1980 if (grp->outstanding_xid2 == 0) { 1981 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1982 mpc_validate_xid(mpcginfo); 1983 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1984 } 1985 break; 1986 case MPCG_STATE_XID0IOWAIX: 1987 if (grp->outstanding_xid2 == 0) { 1988 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1989 mpc_validate_xid(mpcginfo); 1990 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1991 } 1992 break; 1993 } 1994 kfree(mpcginfo); 1995 1996 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1997 __func__, ch->id, grp->outstanding_xid2, 1998 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1999 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2000 __func__, ch->id, 2001 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2002 return; 2003 2004 } 2005 2006 2007 /* 2008 * MPC Group Station FSM action 2009 * CTCM_PROTO_MPC only 2010 */ 2011 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2012 { 2013 struct mpcg_info *mpcginfo = arg; 2014 struct channel *ch = mpcginfo->ch; 2015 struct net_device *dev = ch->netdev; 2016 struct ctcm_priv *priv = dev->ml_priv; 2017 struct mpc_group *grp = priv->mpcg; 2018 2019 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2020 __func__, smp_processor_id(), ch, ch->id); 2021 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2022 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2023 2024 grp->outstanding_xid7--; 2025 ch->xid_skb->data = ch->xid_skb_data; 2026 skb_reset_tail_pointer(ch->xid_skb); 2027 ch->xid_skb->len = 0; 2028 2029 switch (fsm_getstate(grp->fsm)) { 2030 case MPCG_STATE_XID7INITI: 2031 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2032 mpc_validate_xid(mpcginfo); 2033 break; 2034 case MPCG_STATE_XID7INITW: 2035 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2036 mpc_validate_xid(mpcginfo); 2037 break; 2038 case MPCG_STATE_XID7INITZ: 2039 case MPCG_STATE_XID7INITX: 2040 if (grp->outstanding_xid7 == 0) { 2041 if (grp->outstanding_xid7_p2 > 0) { 2042 grp->outstanding_xid7 = 2043 grp->outstanding_xid7_p2; 2044 grp->outstanding_xid7_p2 = 0; 2045 } else 2046 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2047 2048 mpc_validate_xid(mpcginfo); 2049 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2050 break; 2051 } 2052 mpc_validate_xid(mpcginfo); 2053 break; 2054 } 2055 kfree(mpcginfo); 2056 return; 2057 } 2058 2059 /* 2060 * mpc_action helper of an MPC Group Station FSM action 2061 * CTCM_PROTO_MPC only 2062 */ 2063 static int mpc_send_qllc_discontact(struct net_device *dev) 2064 { 2065 __u32 new_len = 0; 2066 struct sk_buff *skb; 2067 struct qllc *qllcptr; 2068 struct ctcm_priv *priv = dev->ml_priv; 2069 struct mpc_group *grp = priv->mpcg; 2070 2071 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2072 __func__, mpcg_state_names[grp->saved_state]); 2073 2074 switch (grp->saved_state) { 2075 /* 2076 * establish conn callback function is 2077 * preferred method to report failure 2078 */ 2079 case MPCG_STATE_XID0IOWAIT: 2080 case MPCG_STATE_XID0IOWAIX: 2081 case MPCG_STATE_XID7INITI: 2082 case MPCG_STATE_XID7INITZ: 2083 case MPCG_STATE_XID2INITW: 2084 case MPCG_STATE_XID2INITX: 2085 case MPCG_STATE_XID7INITW: 2086 case MPCG_STATE_XID7INITX: 2087 if (grp->estconnfunc) { 2088 grp->estconnfunc(grp->port_num, -1, 0); 2089 grp->estconnfunc = NULL; 2090 break; 2091 } 2092 case MPCG_STATE_FLOWC: 2093 case MPCG_STATE_READY: 2094 grp->send_qllc_disc = 2; 2095 new_len = sizeof(struct qllc); 2096 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2097 if (qllcptr == NULL) { 2098 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2099 "%s(%s): qllcptr allocation error", 2100 CTCM_FUNTAIL, dev->name); 2101 return -ENOMEM; 2102 } 2103 2104 qllcptr->qllc_address = 0xcc; 2105 qllcptr->qllc_commands = 0x03; 2106 2107 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2108 2109 if (skb == NULL) { 2110 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2111 "%s(%s): skb allocation error", 2112 CTCM_FUNTAIL, dev->name); 2113 priv->stats.rx_dropped++; 2114 kfree(qllcptr); 2115 return -ENOMEM; 2116 } 2117 2118 skb_put_data(skb, qllcptr, new_len); 2119 kfree(qllcptr); 2120 2121 if (skb_headroom(skb) < 4) { 2122 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2123 "%s(%s): skb_headroom error", 2124 CTCM_FUNTAIL, dev->name); 2125 dev_kfree_skb_any(skb); 2126 return -ENOMEM; 2127 } 2128 2129 *((__u32 *)skb_push(skb, 4)) = 2130 priv->channel[CTCM_READ]->pdu_seq; 2131 priv->channel[CTCM_READ]->pdu_seq++; 2132 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2133 __func__, priv->channel[CTCM_READ]->pdu_seq); 2134 2135 /* receipt of CC03 resets anticipated sequence number on 2136 receiving side */ 2137 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2138 skb_reset_mac_header(skb); 2139 skb->dev = dev; 2140 skb->protocol = htons(ETH_P_SNAP); 2141 skb->ip_summed = CHECKSUM_UNNECESSARY; 2142 2143 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2144 2145 netif_rx(skb); 2146 break; 2147 default: 2148 break; 2149 2150 } 2151 2152 return 0; 2153 } 2154 /* --- This is the END my friend --- */ 2155 2156