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 /* Else, fall through */ 361 case MPCG_STATE_XID0IOWAIT: 362 fsm_deltimer(&grp->timer); 363 grp->outstanding_xid2 = 0; 364 grp->outstanding_xid7 = 0; 365 grp->outstanding_xid7_p2 = 0; 366 grp->saved_xid2 = NULL; 367 if (callback) 368 ctcm_open(dev); 369 fsm_event(priv->fsm, DEV_EVENT_START, dev); 370 break; 371 case MPCG_STATE_READY: 372 /* XID exchanges completed after PORT was activated */ 373 /* Link station already active */ 374 /* Maybe timing issue...retry callback */ 375 grp->allocchan_callback_retries++; 376 if (grp->allocchan_callback_retries < 4) { 377 if (grp->allochanfunc) 378 grp->allochanfunc(grp->port_num, 379 grp->group_max_buflen); 380 } else { 381 /* there are problems...bail out */ 382 /* there may be a state mismatch so restart */ 383 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 384 grp->allocchan_callback_retries = 0; 385 } 386 break; 387 } 388 389 return 0; 390 } 391 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 392 393 /* 394 * ctc_mpc_establish_connectivity 395 * (exported interface) 396 */ 397 void ctc_mpc_establish_connectivity(int port_num, 398 void (*callback)(int, int, int)) 399 { 400 struct net_device *dev; 401 struct mpc_group *grp; 402 struct ctcm_priv *priv; 403 struct channel *rch, *wch; 404 405 dev = ctcmpc_get_dev(port_num); 406 if (dev == NULL) 407 return; 408 priv = dev->ml_priv; 409 grp = priv->mpcg; 410 rch = priv->channel[CTCM_READ]; 411 wch = priv->channel[CTCM_WRITE]; 412 413 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 414 "%s(%s): state=%s", 415 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 416 417 grp->estconnfunc = callback; 418 grp->port_num = port_num; 419 420 switch (fsm_getstate(grp->fsm)) { 421 case MPCG_STATE_READY: 422 /* XID exchanges completed after PORT was activated */ 423 /* Link station already active */ 424 /* Maybe timing issue...retry callback */ 425 fsm_deltimer(&grp->timer); 426 grp->estconn_callback_retries++; 427 if (grp->estconn_callback_retries < 4) { 428 if (grp->estconnfunc) { 429 grp->estconnfunc(grp->port_num, 0, 430 grp->group_max_buflen); 431 grp->estconnfunc = NULL; 432 } 433 } else { 434 /* there are problems...bail out */ 435 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 436 grp->estconn_callback_retries = 0; 437 } 438 break; 439 case MPCG_STATE_INOP: 440 case MPCG_STATE_RESET: 441 /* MPC Group is not ready to start XID - min num of */ 442 /* 1 read and 1 write channel have not been acquired*/ 443 444 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 445 "%s(%s): REJECTED - inactive channels", 446 CTCM_FUNTAIL, dev->name); 447 if (grp->estconnfunc) { 448 grp->estconnfunc(grp->port_num, -1, 0); 449 grp->estconnfunc = NULL; 450 } 451 break; 452 case MPCG_STATE_XID2INITW: 453 /* alloc channel was called but no XID exchange */ 454 /* has occurred. initiate xside XID exchange */ 455 /* make sure yside XID0 processing has not started */ 456 457 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 458 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 459 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 460 "%s(%s): ABORT - PASSIVE XID", 461 CTCM_FUNTAIL, dev->name); 462 break; 463 } 464 grp->send_qllc_disc = 1; 465 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 466 fsm_deltimer(&grp->timer); 467 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 468 MPCG_EVENT_TIMER, dev); 469 grp->outstanding_xid7 = 0; 470 grp->outstanding_xid7_p2 = 0; 471 grp->saved_xid2 = NULL; 472 if ((rch->in_mpcgroup) && 473 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 474 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 475 else { 476 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 477 "%s(%s): RX-%s not ready for ACTIVE XID0", 478 CTCM_FUNTAIL, dev->name, rch->id); 479 if (grp->estconnfunc) { 480 grp->estconnfunc(grp->port_num, -1, 0); 481 grp->estconnfunc = NULL; 482 } 483 fsm_deltimer(&grp->timer); 484 goto done; 485 } 486 if ((wch->in_mpcgroup) && 487 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 488 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 489 else { 490 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 491 "%s(%s): WX-%s not ready for ACTIVE XID0", 492 CTCM_FUNTAIL, dev->name, wch->id); 493 if (grp->estconnfunc) { 494 grp->estconnfunc(grp->port_num, -1, 0); 495 grp->estconnfunc = NULL; 496 } 497 fsm_deltimer(&grp->timer); 498 goto done; 499 } 500 break; 501 case MPCG_STATE_XID0IOWAIT: 502 /* already in active XID negotiations */ 503 default: 504 break; 505 } 506 507 done: 508 CTCM_PR_DEBUG("Exit %s()\n", __func__); 509 return; 510 } 511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 512 513 /* 514 * ctc_mpc_dealloc_ch 515 * (exported interface) 516 */ 517 void ctc_mpc_dealloc_ch(int port_num) 518 { 519 struct net_device *dev; 520 struct ctcm_priv *priv; 521 struct mpc_group *grp; 522 523 dev = ctcmpc_get_dev(port_num); 524 if (dev == NULL) 525 return; 526 priv = dev->ml_priv; 527 grp = priv->mpcg; 528 529 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 530 "%s: %s: refcount = %d\n", 531 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 532 533 fsm_deltimer(&priv->restart_timer); 534 grp->channels_terminating = 0; 535 fsm_deltimer(&grp->timer); 536 grp->allochanfunc = NULL; 537 grp->estconnfunc = NULL; 538 grp->port_persist = 0; 539 grp->send_qllc_disc = 0; 540 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 541 542 ctcm_close(dev); 543 return; 544 } 545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 546 547 /* 548 * ctc_mpc_flow_control 549 * (exported interface) 550 */ 551 void ctc_mpc_flow_control(int port_num, int flowc) 552 { 553 struct ctcm_priv *priv; 554 struct mpc_group *grp; 555 struct net_device *dev; 556 struct channel *rch; 557 int mpcg_state; 558 559 dev = ctcmpc_get_dev(port_num); 560 if (dev == NULL) 561 return; 562 priv = dev->ml_priv; 563 grp = priv->mpcg; 564 565 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 566 "%s: %s: flowc = %d", 567 CTCM_FUNTAIL, dev->name, flowc); 568 569 rch = priv->channel[CTCM_READ]; 570 571 mpcg_state = fsm_getstate(grp->fsm); 572 switch (flowc) { 573 case 1: 574 if (mpcg_state == MPCG_STATE_FLOWC) 575 break; 576 if (mpcg_state == MPCG_STATE_READY) { 577 if (grp->flow_off_called == 1) 578 grp->flow_off_called = 0; 579 else 580 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 581 break; 582 } 583 break; 584 case 0: 585 if (mpcg_state == MPCG_STATE_FLOWC) { 586 fsm_newstate(grp->fsm, MPCG_STATE_READY); 587 /* ensure any data that has accumulated */ 588 /* on the io_queue will now be sen t */ 589 tasklet_schedule(&rch->ch_tasklet); 590 } 591 /* possible race condition */ 592 if (mpcg_state == MPCG_STATE_READY) { 593 grp->flow_off_called = 1; 594 break; 595 } 596 break; 597 } 598 599 } 600 EXPORT_SYMBOL(ctc_mpc_flow_control); 601 602 static int mpc_send_qllc_discontact(struct net_device *); 603 604 /* 605 * helper function of ctcmpc_unpack_skb 606 */ 607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 608 { 609 struct channel *rch = mpcginfo->ch; 610 struct net_device *dev = rch->netdev; 611 struct ctcm_priv *priv = dev->ml_priv; 612 struct mpc_group *grp = priv->mpcg; 613 struct channel *ch = priv->channel[CTCM_WRITE]; 614 615 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 616 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 617 618 grp->sweep_rsp_pend_num--; 619 620 if ((grp->sweep_req_pend_num == 0) && 621 (grp->sweep_rsp_pend_num == 0)) { 622 fsm_deltimer(&ch->sweep_timer); 623 grp->in_sweep = 0; 624 rch->th_seq_num = 0x00; 625 ch->th_seq_num = 0x00; 626 ctcm_clear_busy_do(dev); 627 } 628 629 kfree(mpcginfo); 630 631 return; 632 633 } 634 635 /* 636 * helper function of mpc_rcvd_sweep_req 637 * which is a helper of ctcmpc_unpack_skb 638 */ 639 static void ctcmpc_send_sweep_resp(struct channel *rch) 640 { 641 struct net_device *dev = rch->netdev; 642 struct ctcm_priv *priv = dev->ml_priv; 643 struct mpc_group *grp = priv->mpcg; 644 struct th_sweep *header; 645 struct sk_buff *sweep_skb; 646 struct channel *ch = priv->channel[CTCM_WRITE]; 647 648 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 649 650 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 651 if (sweep_skb == NULL) { 652 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 653 "%s(%s): sweep_skb allocation ERROR\n", 654 CTCM_FUNTAIL, rch->id); 655 goto done; 656 } 657 658 header = kmalloc(sizeof(struct th_sweep), gfp_type()); 659 660 if (!header) { 661 dev_kfree_skb_any(sweep_skb); 662 goto done; 663 } 664 665 header->th.th_seg = 0x00 ; 666 header->th.th_ch_flag = TH_SWEEP_RESP; 667 header->th.th_blk_flag = 0x00; 668 header->th.th_is_xid = 0x00; 669 header->th.th_seq_num = 0x00; 670 header->sw.th_last_seq = ch->th_seq_num; 671 672 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 673 674 kfree(header); 675 676 netif_trans_update(dev); 677 skb_queue_tail(&ch->sweep_queue, sweep_skb); 678 679 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 680 681 return; 682 683 done: 684 grp->in_sweep = 0; 685 ctcm_clear_busy_do(dev); 686 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 687 688 return; 689 } 690 691 /* 692 * helper function of ctcmpc_unpack_skb 693 */ 694 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 695 { 696 struct channel *rch = mpcginfo->ch; 697 struct net_device *dev = rch->netdev; 698 struct ctcm_priv *priv = dev->ml_priv; 699 struct mpc_group *grp = priv->mpcg; 700 struct channel *ch = priv->channel[CTCM_WRITE]; 701 702 if (do_debug) 703 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 704 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 705 706 if (grp->in_sweep == 0) { 707 grp->in_sweep = 1; 708 ctcm_test_and_set_busy(dev); 709 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 710 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 711 } 712 713 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 714 715 grp->sweep_req_pend_num--; 716 ctcmpc_send_sweep_resp(ch); 717 kfree(mpcginfo); 718 return; 719 } 720 721 /* 722 * MPC Group Station FSM definitions 723 */ 724 static const char *mpcg_event_names[] = { 725 [MPCG_EVENT_INOP] = "INOP Condition", 726 [MPCG_EVENT_DISCONC] = "Discontact Received", 727 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 728 [MPCG_EVENT_XID2] = "XID2 Received", 729 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 730 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 731 [MPCG_EVENT_TIMER] = "XID Setup Timer", 732 [MPCG_EVENT_DOIO] = "XID DoIO", 733 }; 734 735 static const char *mpcg_state_names[] = { 736 [MPCG_STATE_RESET] = "Reset", 737 [MPCG_STATE_INOP] = "INOP", 738 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 739 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 740 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 741 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 742 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 743 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 744 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 745 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 746 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 747 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 748 [MPCG_STATE_READY] = "READY", 749 }; 750 751 /* 752 * The MPC Group Station FSM 753 * 22 events 754 */ 755 static const fsm_node mpcg_fsm[] = { 756 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 757 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 758 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 759 760 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 761 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 762 763 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 764 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 765 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 766 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 767 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 768 769 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 770 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 771 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 772 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 773 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 774 775 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 776 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 777 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 778 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 779 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 780 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 781 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 782 783 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 784 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 785 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 786 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 787 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 788 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 789 790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 794 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 795 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 796 797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 801 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 802 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 803 804 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 805 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 806 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 807 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 808 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 809 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 810 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 811 812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 816 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 817 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 818 819 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 820 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 821 }; 822 823 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 824 825 /* 826 * MPC Group Station FSM action 827 * CTCM_PROTO_MPC only 828 */ 829 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 830 { 831 struct net_device *dev = arg; 832 struct ctcm_priv *priv = dev->ml_priv; 833 struct mpc_group *grp = priv->mpcg; 834 835 if (grp == NULL) { 836 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 837 "%s(%s): No MPC group", 838 CTCM_FUNTAIL, dev->name); 839 return; 840 } 841 842 fsm_deltimer(&grp->timer); 843 844 if (grp->saved_xid2->xid2_flag2 == 0x40) { 845 priv->xid->xid2_flag2 = 0x00; 846 if (grp->estconnfunc) { 847 grp->estconnfunc(grp->port_num, 1, 848 grp->group_max_buflen); 849 grp->estconnfunc = NULL; 850 } else if (grp->allochanfunc) 851 grp->send_qllc_disc = 1; 852 853 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 855 "%s(%s): fails", 856 CTCM_FUNTAIL, dev->name); 857 return; 858 } 859 860 grp->port_persist = 1; 861 grp->out_of_sequence = 0; 862 grp->estconn_called = 0; 863 864 tasklet_hi_schedule(&grp->mpc_tasklet2); 865 866 return; 867 } 868 869 /* 870 * helper of ctcm_init_netdevice 871 * CTCM_PROTO_MPC only 872 */ 873 void mpc_group_ready(unsigned long adev) 874 { 875 struct net_device *dev = (struct net_device *)adev; 876 struct ctcm_priv *priv = dev->ml_priv; 877 struct mpc_group *grp = priv->mpcg; 878 struct channel *ch = NULL; 879 880 if (grp == NULL) { 881 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 882 "%s(%s): No MPC group", 883 CTCM_FUNTAIL, dev->name); 884 return; 885 } 886 887 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 888 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 889 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 890 891 fsm_newstate(grp->fsm, MPCG_STATE_READY); 892 893 /* Put up a read on the channel */ 894 ch = priv->channel[CTCM_READ]; 895 ch->pdu_seq = 0; 896 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 897 __func__, ch->pdu_seq); 898 899 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 900 /* Put the write channel in idle state */ 901 ch = priv->channel[CTCM_WRITE]; 902 if (ch->collect_len > 0) { 903 spin_lock(&ch->collect_lock); 904 ctcm_purge_skb_queue(&ch->collect_queue); 905 ch->collect_len = 0; 906 spin_unlock(&ch->collect_lock); 907 } 908 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 909 ctcm_clear_busy(dev); 910 911 if (grp->estconnfunc) { 912 grp->estconnfunc(grp->port_num, 0, 913 grp->group_max_buflen); 914 grp->estconnfunc = NULL; 915 } else if (grp->allochanfunc) 916 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 917 918 grp->send_qllc_disc = 1; 919 grp->changed_side = 0; 920 921 return; 922 923 } 924 925 /* 926 * Increment the MPC Group Active Channel Counts 927 * helper of dev_action (called from channel fsm) 928 */ 929 void mpc_channel_action(struct channel *ch, int direction, int action) 930 { 931 struct net_device *dev = ch->netdev; 932 struct ctcm_priv *priv = dev->ml_priv; 933 struct mpc_group *grp = priv->mpcg; 934 935 if (grp == NULL) { 936 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 937 "%s(%s): No MPC group", 938 CTCM_FUNTAIL, dev->name); 939 return; 940 } 941 942 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 943 944 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 945 "%s: %i / Grp:%s total_channels=%i, active_channels: " 946 "read=%i, write=%i\n", __func__, action, 947 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 948 grp->active_channels[CTCM_READ], 949 grp->active_channels[CTCM_WRITE]); 950 951 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 952 grp->num_channel_paths++; 953 grp->active_channels[direction]++; 954 grp->outstanding_xid2++; 955 ch->in_mpcgroup = 1; 956 957 if (ch->xid_skb != NULL) 958 dev_kfree_skb_any(ch->xid_skb); 959 960 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 961 GFP_ATOMIC | GFP_DMA); 962 if (ch->xid_skb == NULL) { 963 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 964 "%s(%s): Couldn't alloc ch xid_skb\n", 965 CTCM_FUNTAIL, dev->name); 966 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 967 return; 968 } 969 ch->xid_skb_data = ch->xid_skb->data; 970 ch->xid_th = (struct th_header *)ch->xid_skb->data; 971 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 972 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 973 skb_put(ch->xid_skb, XID2_LENGTH); 974 ch->xid_id = skb_tail_pointer(ch->xid_skb); 975 ch->xid_skb->data = ch->xid_skb_data; 976 skb_reset_tail_pointer(ch->xid_skb); 977 ch->xid_skb->len = 0; 978 979 skb_put_data(ch->xid_skb, grp->xid_skb->data, 980 grp->xid_skb->len); 981 982 ch->xid->xid2_dlc_type = 983 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 984 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 985 986 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 987 ch->xid->xid2_buf_len = 0x00; 988 989 ch->xid_skb->data = ch->xid_skb_data; 990 skb_reset_tail_pointer(ch->xid_skb); 991 ch->xid_skb->len = 0; 992 993 fsm_newstate(ch->fsm, CH_XID0_PENDING); 994 995 if ((grp->active_channels[CTCM_READ] > 0) && 996 (grp->active_channels[CTCM_WRITE] > 0) && 997 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 998 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 999 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 1000 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1001 __func__, dev->name); 1002 } 1003 } else if ((action == MPC_CHANNEL_REMOVE) && 1004 (ch->in_mpcgroup == 1)) { 1005 ch->in_mpcgroup = 0; 1006 grp->num_channel_paths--; 1007 grp->active_channels[direction]--; 1008 1009 if (ch->xid_skb != NULL) 1010 dev_kfree_skb_any(ch->xid_skb); 1011 ch->xid_skb = NULL; 1012 1013 if (grp->channels_terminating) 1014 goto done; 1015 1016 if (((grp->active_channels[CTCM_READ] == 0) && 1017 (grp->active_channels[CTCM_WRITE] > 0)) 1018 || ((grp->active_channels[CTCM_WRITE] == 0) && 1019 (grp->active_channels[CTCM_READ] > 0))) 1020 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1021 } 1022 done: 1023 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1024 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1025 "read=%i, write=%i\n", __func__, action, 1026 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1027 grp->active_channels[CTCM_READ], 1028 grp->active_channels[CTCM_WRITE]); 1029 1030 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1031 } 1032 1033 /** 1034 * Unpack a just received skb and hand it over to 1035 * upper layers. 1036 * special MPC version of unpack_skb. 1037 * 1038 * ch The channel where this skb has been received. 1039 * pskb The received skb. 1040 */ 1041 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1042 { 1043 struct net_device *dev = ch->netdev; 1044 struct ctcm_priv *priv = dev->ml_priv; 1045 struct mpc_group *grp = priv->mpcg; 1046 struct pdu *curr_pdu; 1047 struct mpcg_info *mpcginfo; 1048 struct th_header *header = NULL; 1049 struct th_sweep *sweep = NULL; 1050 int pdu_last_seen = 0; 1051 __u32 new_len; 1052 struct sk_buff *skb; 1053 int skblen; 1054 int sendrc = 0; 1055 1056 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1057 __func__, dev->name, smp_processor_id(), ch->id); 1058 1059 header = (struct th_header *)pskb->data; 1060 if ((header->th_seg == 0) && 1061 (header->th_ch_flag == 0) && 1062 (header->th_blk_flag == 0) && 1063 (header->th_seq_num == 0)) 1064 /* nothing for us */ goto done; 1065 1066 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1067 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1068 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1069 1070 pskb->dev = dev; 1071 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1072 skb_pull(pskb, TH_HEADER_LENGTH); 1073 1074 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1075 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1076 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1077 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1078 (header->th_seq_num != ch->th_seq_num + 1) && 1079 (ch->th_seq_num != 0))) { 1080 /* This is NOT the next segment * 1081 * we are not the correct race winner * 1082 * go away and let someone else win * 1083 * BUT..this only applies if xid negot * 1084 * is done * 1085 */ 1086 grp->out_of_sequence += 1; 1087 __skb_push(pskb, TH_HEADER_LENGTH); 1088 skb_queue_tail(&ch->io_queue, pskb); 1089 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1090 "got:%08x\n", __func__, 1091 ch->th_seq_num + 1, header->th_seq_num); 1092 1093 return; 1094 } 1095 grp->out_of_sequence = 0; 1096 ch->th_seq_num = header->th_seq_num; 1097 1098 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1099 __func__, ch->th_seq_num); 1100 1101 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1102 goto done; 1103 while ((pskb->len > 0) && !pdu_last_seen) { 1104 curr_pdu = (struct pdu *)pskb->data; 1105 1106 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1107 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1108 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1109 __func__, pskb->len); 1110 1111 skb_pull(pskb, PDU_HEADER_LENGTH); 1112 1113 if (curr_pdu->pdu_flag & PDU_LAST) 1114 pdu_last_seen = 1; 1115 if (curr_pdu->pdu_flag & PDU_CNTL) 1116 pskb->protocol = htons(ETH_P_SNAP); 1117 else 1118 pskb->protocol = htons(ETH_P_SNA_DIX); 1119 1120 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1121 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1122 "%s(%s): Dropping packet with " 1123 "illegal siize %d", 1124 CTCM_FUNTAIL, dev->name, pskb->len); 1125 1126 priv->stats.rx_dropped++; 1127 priv->stats.rx_length_errors++; 1128 goto done; 1129 } 1130 skb_reset_mac_header(pskb); 1131 new_len = curr_pdu->pdu_offset; 1132 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1133 __func__, new_len); 1134 if ((new_len == 0) || (new_len > pskb->len)) { 1135 /* should never happen */ 1136 /* pskb len must be hosed...bail out */ 1137 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1138 "%s(%s): non valid pdu_offset: %04x", 1139 /* "data may be lost", */ 1140 CTCM_FUNTAIL, dev->name, new_len); 1141 goto done; 1142 } 1143 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1144 1145 if (!skb) { 1146 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1147 "%s(%s): MEMORY allocation error", 1148 CTCM_FUNTAIL, dev->name); 1149 priv->stats.rx_dropped++; 1150 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1151 goto done; 1152 } 1153 skb_put_data(skb, pskb->data, new_len); 1154 1155 skb_reset_mac_header(skb); 1156 skb->dev = pskb->dev; 1157 skb->protocol = pskb->protocol; 1158 skb->ip_summed = CHECKSUM_UNNECESSARY; 1159 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1160 ch->pdu_seq++; 1161 1162 if (do_debug_data) { 1163 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1164 __func__, ch->pdu_seq); 1165 ctcm_pr_debug("%s: skb:%0lx " 1166 "skb len: %d \n", __func__, 1167 (unsigned long)skb, skb->len); 1168 ctcm_pr_debug("%s: up to 32 bytes " 1169 "of pdu_data sent\n", __func__); 1170 ctcmpc_dump32((char *)skb->data, skb->len); 1171 } 1172 1173 skblen = skb->len; 1174 sendrc = netif_rx(skb); 1175 priv->stats.rx_packets++; 1176 priv->stats.rx_bytes += skblen; 1177 skb_pull(pskb, new_len); /* point to next PDU */ 1178 } 1179 } else { 1180 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1181 if (mpcginfo == NULL) 1182 goto done; 1183 1184 mpcginfo->ch = ch; 1185 mpcginfo->th = header; 1186 mpcginfo->skb = pskb; 1187 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1188 __func__); 1189 /* it's a sweep? */ 1190 sweep = (struct th_sweep *)pskb->data; 1191 mpcginfo->sweep = sweep; 1192 if (header->th_ch_flag == TH_SWEEP_REQ) 1193 mpc_rcvd_sweep_req(mpcginfo); 1194 else if (header->th_ch_flag == TH_SWEEP_RESP) 1195 mpc_rcvd_sweep_resp(mpcginfo); 1196 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1197 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1198 skb_pull(pskb, XID2_LENGTH); 1199 mpcginfo->xid = thisxid; 1200 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1201 } else if (header->th_blk_flag == TH_DISCONTACT) 1202 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1203 else if (header->th_seq_num != 0) { 1204 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1205 "%s(%s): control pkt expected\n", 1206 CTCM_FUNTAIL, dev->name); 1207 priv->stats.rx_dropped++; 1208 /* mpcginfo only used for non-data transfers */ 1209 kfree(mpcginfo); 1210 if (do_debug_data) 1211 ctcmpc_dump_skb(pskb, -8); 1212 } 1213 } 1214 done: 1215 1216 dev_kfree_skb_any(pskb); 1217 if (sendrc == NET_RX_DROP) { 1218 dev_warn(&dev->dev, 1219 "The network backlog for %s is exceeded, " 1220 "package dropped\n", __func__); 1221 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1222 } 1223 1224 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1225 __func__, dev->name, ch, ch->id); 1226 } 1227 1228 /** 1229 * tasklet helper for mpc's skb unpacking. 1230 * 1231 * ch The channel to work on. 1232 * Allow flow control back pressure to occur here. 1233 * Throttling back channel can result in excessive 1234 * channel inactivity and system deact of channel 1235 */ 1236 void ctcmpc_bh(unsigned long thischan) 1237 { 1238 struct channel *ch = (struct channel *)thischan; 1239 struct sk_buff *skb; 1240 struct net_device *dev = ch->netdev; 1241 struct ctcm_priv *priv = dev->ml_priv; 1242 struct mpc_group *grp = priv->mpcg; 1243 1244 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1245 dev->name, smp_processor_id(), __func__, ch->id); 1246 /* caller has requested driver to throttle back */ 1247 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1248 (skb = skb_dequeue(&ch->io_queue))) { 1249 ctcmpc_unpack_skb(ch, skb); 1250 if (grp->out_of_sequence > 20) { 1251 /* assume data loss has occurred if */ 1252 /* missing seq_num for extended */ 1253 /* period of time */ 1254 grp->out_of_sequence = 0; 1255 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1256 break; 1257 } 1258 if (skb == skb_peek(&ch->io_queue)) 1259 break; 1260 } 1261 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1262 __func__, dev->name, ch, ch->id); 1263 return; 1264 } 1265 1266 /* 1267 * MPC Group Initializations 1268 */ 1269 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1270 { 1271 struct mpc_group *grp; 1272 1273 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1274 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1275 1276 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1277 if (grp == NULL) 1278 return NULL; 1279 1280 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1281 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1282 mpcg_fsm_len, GFP_KERNEL); 1283 if (grp->fsm == NULL) { 1284 kfree(grp); 1285 return NULL; 1286 } 1287 1288 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1289 fsm_settimer(grp->fsm, &grp->timer); 1290 1291 grp->xid_skb = 1292 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1293 if (grp->xid_skb == NULL) { 1294 kfree_fsm(grp->fsm); 1295 kfree(grp); 1296 return NULL; 1297 } 1298 /* base xid for all channels in group */ 1299 grp->xid_skb_data = grp->xid_skb->data; 1300 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1301 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1302 1303 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1304 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1305 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1306 grp->xid->xid2_sender_id = jiffies; 1307 1308 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1309 skb_put_data(grp->xid_skb, "VTAM", 4); 1310 1311 grp->rcvd_xid_skb = 1312 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1313 if (grp->rcvd_xid_skb == NULL) { 1314 kfree_fsm(grp->fsm); 1315 dev_kfree_skb(grp->xid_skb); 1316 kfree(grp); 1317 return NULL; 1318 } 1319 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1320 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1321 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1322 grp->saved_xid2 = NULL; 1323 priv->xid = grp->xid; 1324 priv->mpcg = grp; 1325 return grp; 1326 } 1327 1328 /* 1329 * The MPC Group Station FSM 1330 */ 1331 1332 /* 1333 * MPC Group Station FSM actions 1334 * CTCM_PROTO_MPC only 1335 */ 1336 1337 /** 1338 * NOP action for statemachines 1339 */ 1340 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1341 { 1342 } 1343 1344 /* 1345 * invoked when the device transitions to dev_stopped 1346 * MPC will stop each individual channel if a single XID failure 1347 * occurs, or will intitiate all channels be stopped if a GROUP 1348 * level failure occurs. 1349 */ 1350 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1351 { 1352 struct net_device *dev = arg; 1353 struct ctcm_priv *priv; 1354 struct mpc_group *grp; 1355 struct channel *wch; 1356 1357 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1358 1359 priv = dev->ml_priv; 1360 grp = priv->mpcg; 1361 grp->flow_off_called = 0; 1362 fsm_deltimer(&grp->timer); 1363 if (grp->channels_terminating) 1364 return; 1365 1366 grp->channels_terminating = 1; 1367 grp->saved_state = fsm_getstate(grp->fsm); 1368 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1369 if (grp->saved_state > MPCG_STATE_XID7INITF) 1370 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1371 "%s(%s): MPC GROUP INOPERATIVE", 1372 CTCM_FUNTAIL, dev->name); 1373 if ((grp->saved_state != MPCG_STATE_RESET) || 1374 /* dealloc_channel has been called */ 1375 (grp->port_persist == 0)) 1376 fsm_deltimer(&priv->restart_timer); 1377 1378 wch = priv->channel[CTCM_WRITE]; 1379 1380 switch (grp->saved_state) { 1381 case MPCG_STATE_RESET: 1382 case MPCG_STATE_INOP: 1383 case MPCG_STATE_XID2INITW: 1384 case MPCG_STATE_XID0IOWAIT: 1385 case MPCG_STATE_XID2INITX: 1386 case MPCG_STATE_XID7INITW: 1387 case MPCG_STATE_XID7INITX: 1388 case MPCG_STATE_XID0IOWAIX: 1389 case MPCG_STATE_XID7INITI: 1390 case MPCG_STATE_XID7INITZ: 1391 case MPCG_STATE_XID7INITF: 1392 break; 1393 case MPCG_STATE_FLOWC: 1394 case MPCG_STATE_READY: 1395 default: 1396 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1397 } 1398 1399 grp->xid2_tgnum = 0; 1400 grp->group_max_buflen = 0; /*min of all received */ 1401 grp->outstanding_xid2 = 0; 1402 grp->outstanding_xid7 = 0; 1403 grp->outstanding_xid7_p2 = 0; 1404 grp->saved_xid2 = NULL; 1405 grp->xidnogood = 0; 1406 grp->changed_side = 0; 1407 1408 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1409 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1410 grp->rcvd_xid_skb->len = 0; 1411 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1412 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1413 1414 if (grp->send_qllc_disc == 1) { 1415 grp->send_qllc_disc = 0; 1416 mpc_send_qllc_discontact(dev); 1417 } 1418 1419 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1420 /* This can result in INOP of VTAM PU due to halting of */ 1421 /* outstanding IO which causes a sense to be returned */ 1422 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1423 /* become unreachable without manual intervention */ 1424 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1425 grp->alloc_called = 0; 1426 fsm_deltimer(&priv->restart_timer); 1427 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1428 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1429 if (grp->saved_state > MPCG_STATE_XID7INITF) 1430 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1431 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1432 CTCM_FUNTAIL, dev->name); 1433 } else { 1434 fsm_deltimer(&priv->restart_timer); 1435 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1436 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1437 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1438 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1439 CTCM_FUNTAIL, dev->name); 1440 } 1441 } 1442 1443 /** 1444 * Handle mpc group action timeout. 1445 * MPC Group Station FSM action 1446 * CTCM_PROTO_MPC only 1447 * 1448 * fi An instance of an mpc_group fsm. 1449 * event The event, just happened. 1450 * arg Generic pointer, casted from net_device * upon call. 1451 */ 1452 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1453 { 1454 struct net_device *dev = arg; 1455 struct ctcm_priv *priv; 1456 struct mpc_group *grp; 1457 struct channel *wch; 1458 struct channel *rch; 1459 1460 priv = dev->ml_priv; 1461 grp = priv->mpcg; 1462 wch = priv->channel[CTCM_WRITE]; 1463 rch = priv->channel[CTCM_READ]; 1464 1465 switch (fsm_getstate(grp->fsm)) { 1466 case MPCG_STATE_XID2INITW: 1467 /* Unless there is outstanding IO on the */ 1468 /* channel just return and wait for ATTN */ 1469 /* interrupt to begin XID negotiations */ 1470 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1471 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1472 break; 1473 /* Else, fall through */ 1474 default: 1475 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1476 } 1477 1478 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1479 "%s: dev=%s exit", 1480 CTCM_FUNTAIL, dev->name); 1481 return; 1482 } 1483 1484 /* 1485 * MPC Group Station FSM action 1486 * CTCM_PROTO_MPC only 1487 */ 1488 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1489 { 1490 struct mpcg_info *mpcginfo = arg; 1491 struct channel *ch = mpcginfo->ch; 1492 struct net_device *dev; 1493 struct ctcm_priv *priv; 1494 struct mpc_group *grp; 1495 1496 if (ch) { 1497 dev = ch->netdev; 1498 if (dev) { 1499 priv = dev->ml_priv; 1500 if (priv) { 1501 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1502 "%s: %s: %s\n", 1503 CTCM_FUNTAIL, dev->name, ch->id); 1504 grp = priv->mpcg; 1505 grp->send_qllc_disc = 1; 1506 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1507 } 1508 } 1509 } 1510 1511 return; 1512 } 1513 1514 /* 1515 * MPC Group Station - not part of FSM 1516 * CTCM_PROTO_MPC only 1517 * called from add_channel in ctcm_main.c 1518 */ 1519 void mpc_action_send_discontact(unsigned long thischan) 1520 { 1521 int rc; 1522 struct channel *ch = (struct channel *)thischan; 1523 unsigned long saveflags = 0; 1524 1525 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1526 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1527 (unsigned long)ch, 0xff, 0); 1528 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1529 1530 if (rc != 0) { 1531 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1532 } 1533 1534 return; 1535 } 1536 1537 1538 /* 1539 * helper function of mpc FSM 1540 * CTCM_PROTO_MPC only 1541 * mpc_action_rcvd_xid7 1542 */ 1543 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1544 { 1545 struct channel *ch = mpcginfo->ch; 1546 struct net_device *dev = ch->netdev; 1547 struct ctcm_priv *priv = dev->ml_priv; 1548 struct mpc_group *grp = priv->mpcg; 1549 struct xid2 *xid = mpcginfo->xid; 1550 int rc = 0; 1551 __u64 our_id = 0; 1552 __u64 their_id = 0; 1553 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1554 1555 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1556 1557 if (xid == NULL) { 1558 rc = 1; 1559 /* XID REJECTED: xid == NULL */ 1560 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1561 "%s(%s): xid = NULL", 1562 CTCM_FUNTAIL, ch->id); 1563 goto done; 1564 } 1565 1566 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1567 1568 /*the received direction should be the opposite of ours */ 1569 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1570 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1571 rc = 2; 1572 /* XID REJECTED: r/w channel pairing mismatch */ 1573 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1574 "%s(%s): r/w channel pairing mismatch", 1575 CTCM_FUNTAIL, ch->id); 1576 goto done; 1577 } 1578 1579 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1580 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1581 grp->group_max_buflen, xid->xid2_buf_len); 1582 1583 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1584 xid->xid2_buf_len - len) 1585 grp->group_max_buflen = xid->xid2_buf_len - len; 1586 } 1587 1588 if (grp->saved_xid2 == NULL) { 1589 grp->saved_xid2 = 1590 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1591 1592 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1593 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1594 1595 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1596 grp->rcvd_xid_skb->len = 0; 1597 1598 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1599 our_id = (__u64)priv->xid->xid2_adj_id; 1600 our_id = our_id << 32; 1601 our_id = our_id + priv->xid->xid2_sender_id; 1602 their_id = (__u64)xid->xid2_adj_id; 1603 their_id = their_id << 32; 1604 their_id = their_id + xid->xid2_sender_id; 1605 /* lower id assume the xside role */ 1606 if (our_id < their_id) { 1607 grp->roll = XSIDE; 1608 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1609 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1610 CTCM_FUNTAIL, ch->id); 1611 } else { 1612 grp->roll = YSIDE; 1613 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1614 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1615 CTCM_FUNTAIL, ch->id); 1616 } 1617 1618 } else { 1619 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1620 rc = 3; 1621 /* XID REJECTED: xid flag byte4 mismatch */ 1622 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1623 "%s(%s): xid flag byte4 mismatch", 1624 CTCM_FUNTAIL, ch->id); 1625 } 1626 if (xid->xid2_flag2 == 0x40) { 1627 rc = 4; 1628 /* XID REJECTED - xid NOGOOD */ 1629 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1630 "%s(%s): xid NOGOOD", 1631 CTCM_FUNTAIL, ch->id); 1632 } 1633 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1634 rc = 5; 1635 /* XID REJECTED - Adjacent Station ID Mismatch */ 1636 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1637 "%s(%s): Adjacent Station ID Mismatch", 1638 CTCM_FUNTAIL, ch->id); 1639 } 1640 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1641 rc = 6; 1642 /* XID REJECTED - Sender Address Mismatch */ 1643 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1644 "%s(%s): Sender Address Mismatch", 1645 CTCM_FUNTAIL, ch->id); 1646 } 1647 } 1648 done: 1649 if (rc) { 1650 dev_warn(&dev->dev, 1651 "The XID used in the MPC protocol is not valid, " 1652 "rc = %d\n", rc); 1653 priv->xid->xid2_flag2 = 0x40; 1654 grp->saved_xid2->xid2_flag2 = 0x40; 1655 } 1656 1657 return rc; 1658 } 1659 1660 /* 1661 * MPC Group Station FSM action 1662 * CTCM_PROTO_MPC only 1663 */ 1664 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1665 { 1666 struct channel *ch = arg; 1667 int rc = 0; 1668 int gotlock = 0; 1669 unsigned long saveflags = 0; /* avoids compiler warning with 1670 spin_unlock_irqrestore */ 1671 1672 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1673 __func__, smp_processor_id(), ch, ch->id); 1674 1675 if (ctcm_checkalloc_buffer(ch)) 1676 goto done; 1677 1678 /* 1679 * skb data-buffer referencing: 1680 */ 1681 ch->trans_skb->data = ch->trans_skb_data; 1682 skb_reset_tail_pointer(ch->trans_skb); 1683 ch->trans_skb->len = 0; 1684 /* result of the previous 3 statements is NOT always 1685 * already set after ctcm_checkalloc_buffer 1686 * because of possible reuse of the trans_skb 1687 */ 1688 memset(ch->trans_skb->data, 0, 16); 1689 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1690 /* check is main purpose here: */ 1691 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1692 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1693 /* check is main purpose here: */ 1694 skb_put(ch->trans_skb, XID2_LENGTH); 1695 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1696 /* cleanup back to startpoint */ 1697 ch->trans_skb->data = ch->trans_skb_data; 1698 skb_reset_tail_pointer(ch->trans_skb); 1699 ch->trans_skb->len = 0; 1700 1701 /* non-checking rewrite of above skb data-buffer referencing: */ 1702 /* 1703 memset(ch->trans_skb->data, 0, 16); 1704 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1705 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1706 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1707 */ 1708 1709 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1710 ch->ccw[8].count = 0; 1711 ch->ccw[8].cda = 0x00; 1712 1713 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1714 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1715 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1716 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1717 1718 if (side == XSIDE) { 1719 /* mpc_action_xside_xid */ 1720 if (ch->xid_th == NULL) 1721 goto done; 1722 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1723 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1724 ch->ccw[9].count = TH_HEADER_LENGTH; 1725 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1726 1727 if (ch->xid == NULL) 1728 goto done; 1729 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1730 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1731 ch->ccw[10].count = XID2_LENGTH; 1732 ch->ccw[10].cda = virt_to_phys(ch->xid); 1733 1734 ch->ccw[11].cmd_code = CCW_CMD_READ; 1735 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1736 ch->ccw[11].count = TH_HEADER_LENGTH; 1737 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1738 1739 ch->ccw[12].cmd_code = CCW_CMD_READ; 1740 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1741 ch->ccw[12].count = XID2_LENGTH; 1742 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1743 1744 ch->ccw[13].cmd_code = CCW_CMD_READ; 1745 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1746 1747 } else { /* side == YSIDE : mpc_action_yside_xid */ 1748 ch->ccw[9].cmd_code = CCW_CMD_READ; 1749 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1750 ch->ccw[9].count = TH_HEADER_LENGTH; 1751 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1752 1753 ch->ccw[10].cmd_code = CCW_CMD_READ; 1754 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1755 ch->ccw[10].count = XID2_LENGTH; 1756 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1757 1758 if (ch->xid_th == NULL) 1759 goto done; 1760 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1761 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1762 ch->ccw[11].count = TH_HEADER_LENGTH; 1763 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1764 1765 if (ch->xid == NULL) 1766 goto done; 1767 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1768 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1769 ch->ccw[12].count = XID2_LENGTH; 1770 ch->ccw[12].cda = virt_to_phys(ch->xid); 1771 1772 if (ch->xid_id == NULL) 1773 goto done; 1774 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1775 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1776 1777 } 1778 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1779 ch->ccw[13].count = 4; 1780 1781 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1782 ch->ccw[14].flags = CCW_FLAG_SLI; 1783 ch->ccw[14].count = 0; 1784 ch->ccw[14].cda = 0; 1785 1786 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1787 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1788 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1789 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1790 1791 if (!in_irq()) { 1792 /* Such conditional locking is a known problem for 1793 * sparse because its static undeterministic. 1794 * Warnings should be ignored here. */ 1795 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1796 gotlock = 1; 1797 } 1798 1799 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1800 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1801 (unsigned long)ch, 0xff, 0); 1802 1803 if (gotlock) /* see remark above about conditional locking */ 1804 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1805 1806 if (rc != 0) { 1807 ctcm_ccw_check_rc(ch, rc, 1808 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1809 } 1810 1811 done: 1812 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1813 __func__, ch, ch->id); 1814 return; 1815 1816 } 1817 1818 /* 1819 * MPC Group Station FSM action 1820 * CTCM_PROTO_MPC only 1821 */ 1822 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1823 { 1824 mpc_action_side_xid(fsm, arg, XSIDE); 1825 } 1826 1827 /* 1828 * MPC Group Station FSM action 1829 * CTCM_PROTO_MPC only 1830 */ 1831 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1832 { 1833 mpc_action_side_xid(fsm, arg, YSIDE); 1834 } 1835 1836 /* 1837 * MPC Group Station FSM action 1838 * CTCM_PROTO_MPC only 1839 */ 1840 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1841 { 1842 struct channel *ch = arg; 1843 struct net_device *dev = ch->netdev; 1844 struct ctcm_priv *priv = dev->ml_priv; 1845 struct mpc_group *grp = priv->mpcg; 1846 1847 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1848 __func__, smp_processor_id(), ch, ch->id); 1849 1850 if (ch->xid == NULL) { 1851 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1852 "%s(%s): ch->xid == NULL", 1853 CTCM_FUNTAIL, dev->name); 1854 return; 1855 } 1856 1857 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1858 1859 ch->xid->xid2_option = XID2_0; 1860 1861 switch (fsm_getstate(grp->fsm)) { 1862 case MPCG_STATE_XID2INITW: 1863 case MPCG_STATE_XID2INITX: 1864 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1865 break; 1866 case MPCG_STATE_XID0IOWAIT: 1867 case MPCG_STATE_XID0IOWAIX: 1868 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1869 break; 1870 } 1871 1872 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1873 1874 return; 1875 } 1876 1877 /* 1878 * MPC Group Station FSM action 1879 * CTCM_PROTO_MPC only 1880 */ 1881 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1882 { 1883 struct net_device *dev = arg; 1884 struct ctcm_priv *priv = dev->ml_priv; 1885 struct mpc_group *grp = NULL; 1886 int direction; 1887 int send = 0; 1888 1889 if (priv) 1890 grp = priv->mpcg; 1891 if (grp == NULL) 1892 return; 1893 1894 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1895 struct channel *ch = priv->channel[direction]; 1896 struct xid2 *thisxid = ch->xid; 1897 ch->xid_skb->data = ch->xid_skb_data; 1898 skb_reset_tail_pointer(ch->xid_skb); 1899 ch->xid_skb->len = 0; 1900 thisxid->xid2_option = XID2_7; 1901 send = 0; 1902 1903 /* xid7 phase 1 */ 1904 if (grp->outstanding_xid7_p2 > 0) { 1905 if (grp->roll == YSIDE) { 1906 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1907 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1908 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1909 skb_put_data(ch->xid_skb, &thdummy, 1910 TH_HEADER_LENGTH); 1911 send = 1; 1912 } 1913 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1914 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1915 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1916 skb_put_data(ch->xid_skb, &thnorm, 1917 TH_HEADER_LENGTH); 1918 send = 1; 1919 } 1920 } else { 1921 /* xid7 phase 2 */ 1922 if (grp->roll == YSIDE) { 1923 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1924 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1925 skb_put_data(ch->xid_skb, &thnorm, 1926 TH_HEADER_LENGTH); 1927 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1928 send = 1; 1929 } 1930 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1931 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1932 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1933 skb_put_data(ch->xid_skb, &thdummy, 1934 TH_HEADER_LENGTH); 1935 send = 1; 1936 } 1937 } 1938 1939 if (send) 1940 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1941 } 1942 1943 return; 1944 } 1945 1946 /* 1947 * MPC Group Station FSM action 1948 * CTCM_PROTO_MPC only 1949 */ 1950 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1951 { 1952 1953 struct mpcg_info *mpcginfo = arg; 1954 struct channel *ch = mpcginfo->ch; 1955 struct net_device *dev = ch->netdev; 1956 struct ctcm_priv *priv = dev->ml_priv; 1957 struct mpc_group *grp = priv->mpcg; 1958 1959 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1960 __func__, ch->id, grp->outstanding_xid2, 1961 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1962 1963 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1964 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1965 1966 grp->outstanding_xid2--; 1967 grp->outstanding_xid7++; 1968 grp->outstanding_xid7_p2++; 1969 1970 /* must change state before validating xid to */ 1971 /* properly handle interim interrupts received*/ 1972 switch (fsm_getstate(grp->fsm)) { 1973 case MPCG_STATE_XID2INITW: 1974 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1975 mpc_validate_xid(mpcginfo); 1976 break; 1977 case MPCG_STATE_XID0IOWAIT: 1978 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1979 mpc_validate_xid(mpcginfo); 1980 break; 1981 case MPCG_STATE_XID2INITX: 1982 if (grp->outstanding_xid2 == 0) { 1983 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1984 mpc_validate_xid(mpcginfo); 1985 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1986 } 1987 break; 1988 case MPCG_STATE_XID0IOWAIX: 1989 if (grp->outstanding_xid2 == 0) { 1990 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1991 mpc_validate_xid(mpcginfo); 1992 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1993 } 1994 break; 1995 } 1996 kfree(mpcginfo); 1997 1998 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1999 __func__, ch->id, grp->outstanding_xid2, 2000 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2001 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2002 __func__, ch->id, 2003 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2004 return; 2005 2006 } 2007 2008 2009 /* 2010 * MPC Group Station FSM action 2011 * CTCM_PROTO_MPC only 2012 */ 2013 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2014 { 2015 struct mpcg_info *mpcginfo = arg; 2016 struct channel *ch = mpcginfo->ch; 2017 struct net_device *dev = ch->netdev; 2018 struct ctcm_priv *priv = dev->ml_priv; 2019 struct mpc_group *grp = priv->mpcg; 2020 2021 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2022 __func__, smp_processor_id(), ch, ch->id); 2023 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2024 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2025 2026 grp->outstanding_xid7--; 2027 ch->xid_skb->data = ch->xid_skb_data; 2028 skb_reset_tail_pointer(ch->xid_skb); 2029 ch->xid_skb->len = 0; 2030 2031 switch (fsm_getstate(grp->fsm)) { 2032 case MPCG_STATE_XID7INITI: 2033 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2034 mpc_validate_xid(mpcginfo); 2035 break; 2036 case MPCG_STATE_XID7INITW: 2037 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2038 mpc_validate_xid(mpcginfo); 2039 break; 2040 case MPCG_STATE_XID7INITZ: 2041 case MPCG_STATE_XID7INITX: 2042 if (grp->outstanding_xid7 == 0) { 2043 if (grp->outstanding_xid7_p2 > 0) { 2044 grp->outstanding_xid7 = 2045 grp->outstanding_xid7_p2; 2046 grp->outstanding_xid7_p2 = 0; 2047 } else 2048 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2049 2050 mpc_validate_xid(mpcginfo); 2051 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2052 break; 2053 } 2054 mpc_validate_xid(mpcginfo); 2055 break; 2056 } 2057 kfree(mpcginfo); 2058 return; 2059 } 2060 2061 /* 2062 * mpc_action helper of an MPC Group Station FSM action 2063 * CTCM_PROTO_MPC only 2064 */ 2065 static int mpc_send_qllc_discontact(struct net_device *dev) 2066 { 2067 __u32 new_len = 0; 2068 struct sk_buff *skb; 2069 struct qllc *qllcptr; 2070 struct ctcm_priv *priv = dev->ml_priv; 2071 struct mpc_group *grp = priv->mpcg; 2072 2073 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2074 __func__, mpcg_state_names[grp->saved_state]); 2075 2076 switch (grp->saved_state) { 2077 /* 2078 * establish conn callback function is 2079 * preferred method to report failure 2080 */ 2081 case MPCG_STATE_XID0IOWAIT: 2082 case MPCG_STATE_XID0IOWAIX: 2083 case MPCG_STATE_XID7INITI: 2084 case MPCG_STATE_XID7INITZ: 2085 case MPCG_STATE_XID2INITW: 2086 case MPCG_STATE_XID2INITX: 2087 case MPCG_STATE_XID7INITW: 2088 case MPCG_STATE_XID7INITX: 2089 if (grp->estconnfunc) { 2090 grp->estconnfunc(grp->port_num, -1, 0); 2091 grp->estconnfunc = NULL; 2092 break; 2093 } 2094 /* Else, fall through */ 2095 case MPCG_STATE_FLOWC: 2096 case MPCG_STATE_READY: 2097 grp->send_qllc_disc = 2; 2098 new_len = sizeof(struct qllc); 2099 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2100 if (qllcptr == NULL) { 2101 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2102 "%s(%s): qllcptr allocation error", 2103 CTCM_FUNTAIL, dev->name); 2104 return -ENOMEM; 2105 } 2106 2107 qllcptr->qllc_address = 0xcc; 2108 qllcptr->qllc_commands = 0x03; 2109 2110 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2111 2112 if (skb == NULL) { 2113 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2114 "%s(%s): skb allocation error", 2115 CTCM_FUNTAIL, dev->name); 2116 priv->stats.rx_dropped++; 2117 kfree(qllcptr); 2118 return -ENOMEM; 2119 } 2120 2121 skb_put_data(skb, qllcptr, new_len); 2122 kfree(qllcptr); 2123 2124 if (skb_headroom(skb) < 4) { 2125 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2126 "%s(%s): skb_headroom error", 2127 CTCM_FUNTAIL, dev->name); 2128 dev_kfree_skb_any(skb); 2129 return -ENOMEM; 2130 } 2131 2132 *((__u32 *)skb_push(skb, 4)) = 2133 priv->channel[CTCM_READ]->pdu_seq; 2134 priv->channel[CTCM_READ]->pdu_seq++; 2135 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2136 __func__, priv->channel[CTCM_READ]->pdu_seq); 2137 2138 /* receipt of CC03 resets anticipated sequence number on 2139 receiving side */ 2140 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2141 skb_reset_mac_header(skb); 2142 skb->dev = dev; 2143 skb->protocol = htons(ETH_P_SNAP); 2144 skb->ip_summed = CHECKSUM_UNNECESSARY; 2145 2146 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2147 2148 netif_rx(skb); 2149 break; 2150 default: 2151 break; 2152 2153 } 2154 2155 return 0; 2156 } 2157 /* --- This is the END my friend --- */ 2158 2159