1 /* 2 * Copyright IBM Corp. 2004, 2007 3 * Authors: Belinda Thompson (belindat@us.ibm.com) 4 * Andy Richter (richtera@us.ibm.com) 5 * Peter Tiedemann (ptiedem@de.ibm.com) 6 */ 7 8 /* 9 This module exports functions to be used by CCS: 10 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 11 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 12 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 13 EXPORT_SYMBOL(ctc_mpc_flow_control); 14 */ 15 16 #undef DEBUG 17 #undef DEBUGDATA 18 #undef DEBUGCCW 19 20 #define KMSG_COMPONENT "ctcm" 21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 22 23 #include <linux/module.h> 24 #include <linux/init.h> 25 #include <linux/kernel.h> 26 #include <linux/slab.h> 27 #include <linux/errno.h> 28 #include <linux/types.h> 29 #include <linux/interrupt.h> 30 #include <linux/timer.h> 31 #include <linux/sched.h> 32 33 #include <linux/signal.h> 34 #include <linux/string.h> 35 #include <linux/proc_fs.h> 36 37 #include <linux/ip.h> 38 #include <linux/if_arp.h> 39 #include <linux/tcp.h> 40 #include <linux/skbuff.h> 41 #include <linux/ctype.h> 42 #include <linux/netdevice.h> 43 #include <net/dst.h> 44 45 #include <linux/io.h> /* instead of <asm/io.h> ok ? */ 46 #include <asm/ccwdev.h> 47 #include <asm/ccwgroup.h> 48 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */ 49 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */ 50 #include <linux/wait.h> 51 #include <linux/moduleparam.h> 52 #include <asm/idals.h> 53 54 #include "ctcm_main.h" 55 #include "ctcm_mpc.h" 56 #include "ctcm_fsms.h" 57 58 static const struct xid2 init_xid = { 59 .xid2_type_id = XID_FM2, 60 .xid2_len = 0x45, 61 .xid2_adj_id = 0, 62 .xid2_rlen = 0x31, 63 .xid2_resv1 = 0, 64 .xid2_flag1 = 0, 65 .xid2_fmtt = 0, 66 .xid2_flag4 = 0x80, 67 .xid2_resv2 = 0, 68 .xid2_tgnum = 0, 69 .xid2_sender_id = 0, 70 .xid2_flag2 = 0, 71 .xid2_option = XID2_0, 72 .xid2_resv3 = "\x00", 73 .xid2_resv4 = 0, 74 .xid2_dlc_type = XID2_READ_SIDE, 75 .xid2_resv5 = 0, 76 .xid2_mpc_flag = 0, 77 .xid2_resv6 = 0, 78 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), 79 }; 80 81 static const struct th_header thnorm = { 82 .th_seg = 0x00, 83 .th_ch_flag = TH_IS_XID, 84 .th_blk_flag = TH_DATA_IS_XID, 85 .th_is_xid = 0x01, 86 .th_seq_num = 0x00000000, 87 }; 88 89 static const struct th_header thdummy = { 90 .th_seg = 0x00, 91 .th_ch_flag = 0x00, 92 .th_blk_flag = TH_DATA_IS_XID, 93 .th_is_xid = 0x01, 94 .th_seq_num = 0x00000000, 95 }; 96 97 /* 98 * Definition of one MPC group 99 */ 100 101 /* 102 * Compatibility macros for busy handling 103 * of network devices. 104 */ 105 106 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 107 108 /* 109 * MPC Group state machine actions (static prototypes) 110 */ 111 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 112 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 113 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 114 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 115 static int mpc_validate_xid(struct mpcg_info *mpcginfo); 116 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 117 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 118 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 119 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 120 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 121 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 122 123 #ifdef DEBUGDATA 124 /*-------------------------------------------------------------------* 125 * Dump buffer format * 126 * * 127 *--------------------------------------------------------------------*/ 128 void ctcmpc_dumpit(char *buf, int len) 129 { 130 __u32 ct, sw, rm, dup; 131 char *ptr, *rptr; 132 char tbuf[82], tdup[82]; 133 char addr[22]; 134 char boff[12]; 135 char bhex[82], duphex[82]; 136 char basc[40]; 137 138 sw = 0; 139 rptr = ptr = buf; 140 rm = 16; 141 duphex[0] = 0x00; 142 dup = 0; 143 144 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 145 if (sw == 0) { 146 sprintf(addr, "%16.16llx", (__u64)rptr); 147 148 sprintf(boff, "%4.4X", (__u32)ct); 149 bhex[0] = '\0'; 150 basc[0] = '\0'; 151 } 152 if ((sw == 4) || (sw == 12)) 153 strcat(bhex, " "); 154 if (sw == 8) 155 strcat(bhex, " "); 156 157 sprintf(tbuf, "%2.2llX", (__u64)*ptr); 158 159 tbuf[2] = '\0'; 160 strcat(bhex, tbuf); 161 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 162 basc[sw] = *ptr; 163 else 164 basc[sw] = '.'; 165 166 basc[sw+1] = '\0'; 167 sw++; 168 rm--; 169 if (sw != 16) 170 continue; 171 if ((strcmp(duphex, bhex)) != 0) { 172 if (dup != 0) { 173 sprintf(tdup, 174 "Duplicate as above to %s", addr); 175 ctcm_pr_debug(" --- %s ---\n", 176 tdup); 177 } 178 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 179 addr, boff, bhex, basc); 180 dup = 0; 181 strcpy(duphex, bhex); 182 } else 183 dup++; 184 185 sw = 0; 186 rm = 16; 187 } /* endfor */ 188 189 if (sw != 0) { 190 for ( ; rm > 0; rm--, sw++) { 191 if ((sw == 4) || (sw == 12)) 192 strcat(bhex, " "); 193 if (sw == 8) 194 strcat(bhex, " "); 195 strcat(bhex, " "); 196 strcat(basc, " "); 197 } 198 if (dup != 0) { 199 sprintf(tdup, "Duplicate as above to %s", addr); 200 ctcm_pr_debug(" --- %s ---\n", tdup); 201 } 202 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 203 addr, boff, bhex, basc); 204 } else { 205 if (dup >= 1) { 206 sprintf(tdup, "Duplicate as above to %s", addr); 207 ctcm_pr_debug(" --- %s ---\n", tdup); 208 } 209 if (dup != 0) { 210 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 211 addr, boff, bhex, basc); 212 } 213 } 214 215 return; 216 217 } /* end of ctcmpc_dumpit */ 218 #endif 219 220 #ifdef DEBUGDATA 221 /* 222 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 223 * 224 * skb The sk_buff to dump. 225 * offset Offset relative to skb-data, where to start the dump. 226 */ 227 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 228 { 229 __u8 *p = skb->data; 230 struct th_header *header; 231 struct pdu *pheader; 232 int bl = skb->len; 233 int i; 234 235 if (p == NULL) 236 return; 237 238 p += offset; 239 header = (struct th_header *)p; 240 241 ctcm_pr_debug("dump:\n"); 242 ctcm_pr_debug("skb len=%d \n", skb->len); 243 if (skb->len > 2) { 244 switch (header->th_ch_flag) { 245 case TH_HAS_PDU: 246 break; 247 case 0x00: 248 case TH_IS_XID: 249 if ((header->th_blk_flag == TH_DATA_IS_XID) && 250 (header->th_is_xid == 0x01)) 251 goto dumpth; 252 case TH_SWEEP_REQ: 253 goto dumpth; 254 case TH_SWEEP_RESP: 255 goto dumpth; 256 default: 257 break; 258 } 259 260 pheader = (struct pdu *)p; 261 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 262 pheader->pdu_offset, pheader->pdu_offset); 263 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 264 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 265 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 266 goto dumpdata; 267 268 dumpth: 269 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 270 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 271 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 272 ctcm_pr_debug("th->type : %s\n", 273 (header->th_is_xid) ? "DATA" : "XID"); 274 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 275 276 } 277 dumpdata: 278 if (bl > 32) 279 bl = 32; 280 ctcm_pr_debug("data: "); 281 for (i = 0; i < bl; i++) 282 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 283 ctcm_pr_debug("\n"); 284 } 285 #endif 286 287 static struct net_device *ctcmpc_get_dev(int port_num) 288 { 289 char device[20]; 290 struct net_device *dev; 291 struct ctcm_priv *priv; 292 293 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 294 295 dev = __dev_get_by_name(&init_net, device); 296 297 if (dev == NULL) { 298 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 299 "%s: Device not found by name: %s", 300 CTCM_FUNTAIL, device); 301 return NULL; 302 } 303 priv = dev->ml_priv; 304 if (priv == NULL) { 305 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 306 "%s(%s): dev->ml_priv is NULL", 307 CTCM_FUNTAIL, device); 308 return NULL; 309 } 310 if (priv->mpcg == NULL) { 311 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 312 "%s(%s): priv->mpcg is NULL", 313 CTCM_FUNTAIL, device); 314 return NULL; 315 } 316 return dev; 317 } 318 319 /* 320 * ctc_mpc_alloc_channel 321 * (exported interface) 322 * 323 * Device Initialization : 324 * ACTPATH driven IO operations 325 */ 326 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 327 { 328 struct net_device *dev; 329 struct mpc_group *grp; 330 struct ctcm_priv *priv; 331 332 dev = ctcmpc_get_dev(port_num); 333 if (dev == NULL) 334 return 1; 335 priv = dev->ml_priv; 336 grp = priv->mpcg; 337 338 grp->allochanfunc = callback; 339 grp->port_num = port_num; 340 grp->port_persist = 1; 341 342 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 343 "%s(%s): state=%s", 344 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 345 346 switch (fsm_getstate(grp->fsm)) { 347 case MPCG_STATE_INOP: 348 /* Group is in the process of terminating */ 349 grp->alloc_called = 1; 350 break; 351 case MPCG_STATE_RESET: 352 /* MPC Group will transition to state */ 353 /* MPCG_STATE_XID2INITW iff the minimum number */ 354 /* of 1 read and 1 write channel have successfully*/ 355 /* activated */ 356 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 357 if (callback) 358 grp->send_qllc_disc = 1; 359 case MPCG_STATE_XID0IOWAIT: 360 fsm_deltimer(&grp->timer); 361 grp->outstanding_xid2 = 0; 362 grp->outstanding_xid7 = 0; 363 grp->outstanding_xid7_p2 = 0; 364 grp->saved_xid2 = NULL; 365 if (callback) 366 ctcm_open(dev); 367 fsm_event(priv->fsm, DEV_EVENT_START, dev); 368 break; 369 case MPCG_STATE_READY: 370 /* XID exchanges completed after PORT was activated */ 371 /* Link station already active */ 372 /* Maybe timing issue...retry callback */ 373 grp->allocchan_callback_retries++; 374 if (grp->allocchan_callback_retries < 4) { 375 if (grp->allochanfunc) 376 grp->allochanfunc(grp->port_num, 377 grp->group_max_buflen); 378 } else { 379 /* there are problems...bail out */ 380 /* there may be a state mismatch so restart */ 381 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 382 grp->allocchan_callback_retries = 0; 383 } 384 break; 385 } 386 387 return 0; 388 } 389 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 390 391 /* 392 * ctc_mpc_establish_connectivity 393 * (exported interface) 394 */ 395 void ctc_mpc_establish_connectivity(int port_num, 396 void (*callback)(int, int, int)) 397 { 398 struct net_device *dev; 399 struct mpc_group *grp; 400 struct ctcm_priv *priv; 401 struct channel *rch, *wch; 402 403 dev = ctcmpc_get_dev(port_num); 404 if (dev == NULL) 405 return; 406 priv = dev->ml_priv; 407 grp = priv->mpcg; 408 rch = priv->channel[CTCM_READ]; 409 wch = priv->channel[CTCM_WRITE]; 410 411 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 412 "%s(%s): state=%s", 413 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 414 415 grp->estconnfunc = callback; 416 grp->port_num = port_num; 417 418 switch (fsm_getstate(grp->fsm)) { 419 case MPCG_STATE_READY: 420 /* XID exchanges completed after PORT was activated */ 421 /* Link station already active */ 422 /* Maybe timing issue...retry callback */ 423 fsm_deltimer(&grp->timer); 424 grp->estconn_callback_retries++; 425 if (grp->estconn_callback_retries < 4) { 426 if (grp->estconnfunc) { 427 grp->estconnfunc(grp->port_num, 0, 428 grp->group_max_buflen); 429 grp->estconnfunc = NULL; 430 } 431 } else { 432 /* there are problems...bail out */ 433 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 434 grp->estconn_callback_retries = 0; 435 } 436 break; 437 case MPCG_STATE_INOP: 438 case MPCG_STATE_RESET: 439 /* MPC Group is not ready to start XID - min num of */ 440 /* 1 read and 1 write channel have not been acquired*/ 441 442 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 443 "%s(%s): REJECTED - inactive channels", 444 CTCM_FUNTAIL, dev->name); 445 if (grp->estconnfunc) { 446 grp->estconnfunc(grp->port_num, -1, 0); 447 grp->estconnfunc = NULL; 448 } 449 break; 450 case MPCG_STATE_XID2INITW: 451 /* alloc channel was called but no XID exchange */ 452 /* has occurred. initiate xside XID exchange */ 453 /* make sure yside XID0 processing has not started */ 454 455 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 456 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 457 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 458 "%s(%s): ABORT - PASSIVE XID", 459 CTCM_FUNTAIL, dev->name); 460 break; 461 } 462 grp->send_qllc_disc = 1; 463 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 464 fsm_deltimer(&grp->timer); 465 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 466 MPCG_EVENT_TIMER, dev); 467 grp->outstanding_xid7 = 0; 468 grp->outstanding_xid7_p2 = 0; 469 grp->saved_xid2 = NULL; 470 if ((rch->in_mpcgroup) && 471 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 472 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 473 else { 474 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 475 "%s(%s): RX-%s not ready for ACTIVE XID0", 476 CTCM_FUNTAIL, dev->name, rch->id); 477 if (grp->estconnfunc) { 478 grp->estconnfunc(grp->port_num, -1, 0); 479 grp->estconnfunc = NULL; 480 } 481 fsm_deltimer(&grp->timer); 482 goto done; 483 } 484 if ((wch->in_mpcgroup) && 485 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 486 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 487 else { 488 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 489 "%s(%s): WX-%s not ready for ACTIVE XID0", 490 CTCM_FUNTAIL, dev->name, wch->id); 491 if (grp->estconnfunc) { 492 grp->estconnfunc(grp->port_num, -1, 0); 493 grp->estconnfunc = NULL; 494 } 495 fsm_deltimer(&grp->timer); 496 goto done; 497 } 498 break; 499 case MPCG_STATE_XID0IOWAIT: 500 /* already in active XID negotiations */ 501 default: 502 break; 503 } 504 505 done: 506 CTCM_PR_DEBUG("Exit %s()\n", __func__); 507 return; 508 } 509 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 510 511 /* 512 * ctc_mpc_dealloc_ch 513 * (exported interface) 514 */ 515 void ctc_mpc_dealloc_ch(int port_num) 516 { 517 struct net_device *dev; 518 struct ctcm_priv *priv; 519 struct mpc_group *grp; 520 521 dev = ctcmpc_get_dev(port_num); 522 if (dev == NULL) 523 return; 524 priv = dev->ml_priv; 525 grp = priv->mpcg; 526 527 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 528 "%s: %s: refcount = %d\n", 529 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 530 531 fsm_deltimer(&priv->restart_timer); 532 grp->channels_terminating = 0; 533 fsm_deltimer(&grp->timer); 534 grp->allochanfunc = NULL; 535 grp->estconnfunc = NULL; 536 grp->port_persist = 0; 537 grp->send_qllc_disc = 0; 538 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 539 540 ctcm_close(dev); 541 return; 542 } 543 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 544 545 /* 546 * ctc_mpc_flow_control 547 * (exported interface) 548 */ 549 void ctc_mpc_flow_control(int port_num, int flowc) 550 { 551 struct ctcm_priv *priv; 552 struct mpc_group *grp; 553 struct net_device *dev; 554 struct channel *rch; 555 int mpcg_state; 556 557 dev = ctcmpc_get_dev(port_num); 558 if (dev == NULL) 559 return; 560 priv = dev->ml_priv; 561 grp = priv->mpcg; 562 563 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 564 "%s: %s: flowc = %d", 565 CTCM_FUNTAIL, dev->name, flowc); 566 567 rch = priv->channel[CTCM_READ]; 568 569 mpcg_state = fsm_getstate(grp->fsm); 570 switch (flowc) { 571 case 1: 572 if (mpcg_state == MPCG_STATE_FLOWC) 573 break; 574 if (mpcg_state == MPCG_STATE_READY) { 575 if (grp->flow_off_called == 1) 576 grp->flow_off_called = 0; 577 else 578 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 579 break; 580 } 581 break; 582 case 0: 583 if (mpcg_state == MPCG_STATE_FLOWC) { 584 fsm_newstate(grp->fsm, MPCG_STATE_READY); 585 /* ensure any data that has accumulated */ 586 /* on the io_queue will now be sen t */ 587 tasklet_schedule(&rch->ch_tasklet); 588 } 589 /* possible race condition */ 590 if (mpcg_state == MPCG_STATE_READY) { 591 grp->flow_off_called = 1; 592 break; 593 } 594 break; 595 } 596 597 } 598 EXPORT_SYMBOL(ctc_mpc_flow_control); 599 600 static int mpc_send_qllc_discontact(struct net_device *); 601 602 /* 603 * helper function of ctcmpc_unpack_skb 604 */ 605 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 606 { 607 struct channel *rch = mpcginfo->ch; 608 struct net_device *dev = rch->netdev; 609 struct ctcm_priv *priv = dev->ml_priv; 610 struct mpc_group *grp = priv->mpcg; 611 struct channel *ch = priv->channel[CTCM_WRITE]; 612 613 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 614 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 615 616 grp->sweep_rsp_pend_num--; 617 618 if ((grp->sweep_req_pend_num == 0) && 619 (grp->sweep_rsp_pend_num == 0)) { 620 fsm_deltimer(&ch->sweep_timer); 621 grp->in_sweep = 0; 622 rch->th_seq_num = 0x00; 623 ch->th_seq_num = 0x00; 624 ctcm_clear_busy_do(dev); 625 } 626 627 kfree(mpcginfo); 628 629 return; 630 631 } 632 633 /* 634 * helper function of mpc_rcvd_sweep_req 635 * which is a helper of ctcmpc_unpack_skb 636 */ 637 static void ctcmpc_send_sweep_resp(struct channel *rch) 638 { 639 struct net_device *dev = rch->netdev; 640 struct ctcm_priv *priv = dev->ml_priv; 641 struct mpc_group *grp = priv->mpcg; 642 struct th_sweep *header; 643 struct sk_buff *sweep_skb; 644 struct channel *ch = priv->channel[CTCM_WRITE]; 645 646 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 647 648 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 649 if (sweep_skb == NULL) { 650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 651 "%s(%s): sweep_skb allocation ERROR\n", 652 CTCM_FUNTAIL, rch->id); 653 goto done; 654 } 655 656 header = kmalloc(sizeof(struct th_sweep), gfp_type()); 657 658 if (!header) { 659 dev_kfree_skb_any(sweep_skb); 660 goto done; 661 } 662 663 header->th.th_seg = 0x00 ; 664 header->th.th_ch_flag = TH_SWEEP_RESP; 665 header->th.th_blk_flag = 0x00; 666 header->th.th_is_xid = 0x00; 667 header->th.th_seq_num = 0x00; 668 header->sw.th_last_seq = ch->th_seq_num; 669 670 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 671 672 kfree(header); 673 674 dev->trans_start = jiffies; 675 skb_queue_tail(&ch->sweep_queue, sweep_skb); 676 677 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 678 679 return; 680 681 done: 682 grp->in_sweep = 0; 683 ctcm_clear_busy_do(dev); 684 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 685 686 return; 687 } 688 689 /* 690 * helper function of ctcmpc_unpack_skb 691 */ 692 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 693 { 694 struct channel *rch = mpcginfo->ch; 695 struct net_device *dev = rch->netdev; 696 struct ctcm_priv *priv = dev->ml_priv; 697 struct mpc_group *grp = priv->mpcg; 698 struct channel *ch = priv->channel[CTCM_WRITE]; 699 700 if (do_debug) 701 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 702 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 703 704 if (grp->in_sweep == 0) { 705 grp->in_sweep = 1; 706 ctcm_test_and_set_busy(dev); 707 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 708 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 709 } 710 711 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 712 713 grp->sweep_req_pend_num--; 714 ctcmpc_send_sweep_resp(ch); 715 kfree(mpcginfo); 716 return; 717 } 718 719 /* 720 * MPC Group Station FSM definitions 721 */ 722 static const char *mpcg_event_names[] = { 723 [MPCG_EVENT_INOP] = "INOP Condition", 724 [MPCG_EVENT_DISCONC] = "Discontact Received", 725 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 726 [MPCG_EVENT_XID2] = "XID2 Received", 727 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 728 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 729 [MPCG_EVENT_TIMER] = "XID Setup Timer", 730 [MPCG_EVENT_DOIO] = "XID DoIO", 731 }; 732 733 static const char *mpcg_state_names[] = { 734 [MPCG_STATE_RESET] = "Reset", 735 [MPCG_STATE_INOP] = "INOP", 736 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 737 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 738 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 739 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 740 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 741 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 742 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 743 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 744 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 745 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 746 [MPCG_STATE_READY] = "READY", 747 }; 748 749 /* 750 * The MPC Group Station FSM 751 * 22 events 752 */ 753 static const fsm_node mpcg_fsm[] = { 754 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 755 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 756 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 757 758 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 759 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 760 761 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 763 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 764 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 765 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 766 767 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 769 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 770 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 771 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 772 773 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 774 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 775 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 776 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 777 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 778 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 779 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 780 781 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 782 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 783 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 784 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 785 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 786 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 787 788 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 794 795 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 801 802 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 804 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 805 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 806 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 807 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 808 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 809 810 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 816 817 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 818 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 819 }; 820 821 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 822 823 /* 824 * MPC Group Station FSM action 825 * CTCM_PROTO_MPC only 826 */ 827 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 828 { 829 struct net_device *dev = arg; 830 struct ctcm_priv *priv = dev->ml_priv; 831 struct mpc_group *grp = priv->mpcg; 832 833 if (grp == NULL) { 834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 835 "%s(%s): No MPC group", 836 CTCM_FUNTAIL, dev->name); 837 return; 838 } 839 840 fsm_deltimer(&grp->timer); 841 842 if (grp->saved_xid2->xid2_flag2 == 0x40) { 843 priv->xid->xid2_flag2 = 0x00; 844 if (grp->estconnfunc) { 845 grp->estconnfunc(grp->port_num, 1, 846 grp->group_max_buflen); 847 grp->estconnfunc = NULL; 848 } else if (grp->allochanfunc) 849 grp->send_qllc_disc = 1; 850 851 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 852 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 853 "%s(%s): fails", 854 CTCM_FUNTAIL, dev->name); 855 return; 856 } 857 858 grp->port_persist = 1; 859 grp->out_of_sequence = 0; 860 grp->estconn_called = 0; 861 862 tasklet_hi_schedule(&grp->mpc_tasklet2); 863 864 return; 865 } 866 867 /* 868 * helper of ctcm_init_netdevice 869 * CTCM_PROTO_MPC only 870 */ 871 void mpc_group_ready(unsigned long adev) 872 { 873 struct net_device *dev = (struct net_device *)adev; 874 struct ctcm_priv *priv = dev->ml_priv; 875 struct mpc_group *grp = priv->mpcg; 876 struct channel *ch = NULL; 877 878 if (grp == NULL) { 879 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 880 "%s(%s): No MPC group", 881 CTCM_FUNTAIL, dev->name); 882 return; 883 } 884 885 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 886 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 887 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 888 889 fsm_newstate(grp->fsm, MPCG_STATE_READY); 890 891 /* Put up a read on the channel */ 892 ch = priv->channel[CTCM_READ]; 893 ch->pdu_seq = 0; 894 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 895 __func__, ch->pdu_seq); 896 897 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 898 /* Put the write channel in idle state */ 899 ch = priv->channel[CTCM_WRITE]; 900 if (ch->collect_len > 0) { 901 spin_lock(&ch->collect_lock); 902 ctcm_purge_skb_queue(&ch->collect_queue); 903 ch->collect_len = 0; 904 spin_unlock(&ch->collect_lock); 905 } 906 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 907 ctcm_clear_busy(dev); 908 909 if (grp->estconnfunc) { 910 grp->estconnfunc(grp->port_num, 0, 911 grp->group_max_buflen); 912 grp->estconnfunc = NULL; 913 } else if (grp->allochanfunc) 914 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 915 916 grp->send_qllc_disc = 1; 917 grp->changed_side = 0; 918 919 return; 920 921 } 922 923 /* 924 * Increment the MPC Group Active Channel Counts 925 * helper of dev_action (called from channel fsm) 926 */ 927 void mpc_channel_action(struct channel *ch, int direction, int action) 928 { 929 struct net_device *dev = ch->netdev; 930 struct ctcm_priv *priv = dev->ml_priv; 931 struct mpc_group *grp = priv->mpcg; 932 933 if (grp == NULL) { 934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 935 "%s(%s): No MPC group", 936 CTCM_FUNTAIL, dev->name); 937 return; 938 } 939 940 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 941 942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 943 "%s: %i / Grp:%s total_channels=%i, active_channels: " 944 "read=%i, write=%i\n", __func__, action, 945 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 946 grp->active_channels[CTCM_READ], 947 grp->active_channels[CTCM_WRITE]); 948 949 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 950 grp->num_channel_paths++; 951 grp->active_channels[direction]++; 952 grp->outstanding_xid2++; 953 ch->in_mpcgroup = 1; 954 955 if (ch->xid_skb != NULL) 956 dev_kfree_skb_any(ch->xid_skb); 957 958 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 959 GFP_ATOMIC | GFP_DMA); 960 if (ch->xid_skb == NULL) { 961 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 962 "%s(%s): Couldn't alloc ch xid_skb\n", 963 CTCM_FUNTAIL, dev->name); 964 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 965 return; 966 } 967 ch->xid_skb_data = ch->xid_skb->data; 968 ch->xid_th = (struct th_header *)ch->xid_skb->data; 969 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 970 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 971 skb_put(ch->xid_skb, XID2_LENGTH); 972 ch->xid_id = skb_tail_pointer(ch->xid_skb); 973 ch->xid_skb->data = ch->xid_skb_data; 974 skb_reset_tail_pointer(ch->xid_skb); 975 ch->xid_skb->len = 0; 976 977 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len), 978 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 memcpy(skb_put(skb, new_len), 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 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH), 1301 &thnorm, TH_HEADER_LENGTH); 1302 1303 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1304 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &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 memcpy(skb_put(grp->xid_skb, 4), "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 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), 1322 &thnorm, TH_HEADER_LENGTH); 1323 grp->saved_xid2 = NULL; 1324 priv->xid = grp->xid; 1325 priv->mpcg = grp; 1326 return grp; 1327 } 1328 1329 /* 1330 * The MPC Group Station FSM 1331 */ 1332 1333 /* 1334 * MPC Group Station FSM actions 1335 * CTCM_PROTO_MPC only 1336 */ 1337 1338 /** 1339 * NOP action for statemachines 1340 */ 1341 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1342 { 1343 } 1344 1345 /* 1346 * invoked when the device transitions to dev_stopped 1347 * MPC will stop each individual channel if a single XID failure 1348 * occurs, or will intitiate all channels be stopped if a GROUP 1349 * level failure occurs. 1350 */ 1351 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1352 { 1353 struct net_device *dev = arg; 1354 struct ctcm_priv *priv; 1355 struct mpc_group *grp; 1356 struct channel *wch; 1357 1358 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1359 1360 priv = dev->ml_priv; 1361 grp = priv->mpcg; 1362 grp->flow_off_called = 0; 1363 fsm_deltimer(&grp->timer); 1364 if (grp->channels_terminating) 1365 return; 1366 1367 grp->channels_terminating = 1; 1368 grp->saved_state = fsm_getstate(grp->fsm); 1369 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1370 if (grp->saved_state > MPCG_STATE_XID7INITF) 1371 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1372 "%s(%s): MPC GROUP INOPERATIVE", 1373 CTCM_FUNTAIL, dev->name); 1374 if ((grp->saved_state != MPCG_STATE_RESET) || 1375 /* dealloc_channel has been called */ 1376 (grp->port_persist == 0)) 1377 fsm_deltimer(&priv->restart_timer); 1378 1379 wch = priv->channel[CTCM_WRITE]; 1380 1381 switch (grp->saved_state) { 1382 case MPCG_STATE_RESET: 1383 case MPCG_STATE_INOP: 1384 case MPCG_STATE_XID2INITW: 1385 case MPCG_STATE_XID0IOWAIT: 1386 case MPCG_STATE_XID2INITX: 1387 case MPCG_STATE_XID7INITW: 1388 case MPCG_STATE_XID7INITX: 1389 case MPCG_STATE_XID0IOWAIX: 1390 case MPCG_STATE_XID7INITI: 1391 case MPCG_STATE_XID7INITZ: 1392 case MPCG_STATE_XID7INITF: 1393 break; 1394 case MPCG_STATE_FLOWC: 1395 case MPCG_STATE_READY: 1396 default: 1397 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1398 } 1399 1400 grp->xid2_tgnum = 0; 1401 grp->group_max_buflen = 0; /*min of all received */ 1402 grp->outstanding_xid2 = 0; 1403 grp->outstanding_xid7 = 0; 1404 grp->outstanding_xid7_p2 = 0; 1405 grp->saved_xid2 = NULL; 1406 grp->xidnogood = 0; 1407 grp->changed_side = 0; 1408 1409 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1410 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1411 grp->rcvd_xid_skb->len = 0; 1412 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1413 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm, 1414 TH_HEADER_LENGTH); 1415 1416 if (grp->send_qllc_disc == 1) { 1417 grp->send_qllc_disc = 0; 1418 mpc_send_qllc_discontact(dev); 1419 } 1420 1421 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1422 /* This can result in INOP of VTAM PU due to halting of */ 1423 /* outstanding IO which causes a sense to be returned */ 1424 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1425 /* become unreachable without manual intervention */ 1426 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1427 grp->alloc_called = 0; 1428 fsm_deltimer(&priv->restart_timer); 1429 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1430 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1431 if (grp->saved_state > MPCG_STATE_XID7INITF) 1432 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1433 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1434 CTCM_FUNTAIL, dev->name); 1435 } else { 1436 fsm_deltimer(&priv->restart_timer); 1437 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1438 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1439 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1440 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1441 CTCM_FUNTAIL, dev->name); 1442 } 1443 } 1444 1445 /** 1446 * Handle mpc group action timeout. 1447 * MPC Group Station FSM action 1448 * CTCM_PROTO_MPC only 1449 * 1450 * fi An instance of an mpc_group fsm. 1451 * event The event, just happened. 1452 * arg Generic pointer, casted from net_device * upon call. 1453 */ 1454 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1455 { 1456 struct net_device *dev = arg; 1457 struct ctcm_priv *priv; 1458 struct mpc_group *grp; 1459 struct channel *wch; 1460 struct channel *rch; 1461 1462 priv = dev->ml_priv; 1463 grp = priv->mpcg; 1464 wch = priv->channel[CTCM_WRITE]; 1465 rch = priv->channel[CTCM_READ]; 1466 1467 switch (fsm_getstate(grp->fsm)) { 1468 case MPCG_STATE_XID2INITW: 1469 /* Unless there is outstanding IO on the */ 1470 /* channel just return and wait for ATTN */ 1471 /* interrupt to begin XID negotiations */ 1472 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1473 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1474 break; 1475 default: 1476 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1477 } 1478 1479 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1480 "%s: dev=%s exit", 1481 CTCM_FUNTAIL, dev->name); 1482 return; 1483 } 1484 1485 /* 1486 * MPC Group Station FSM action 1487 * CTCM_PROTO_MPC only 1488 */ 1489 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1490 { 1491 struct mpcg_info *mpcginfo = arg; 1492 struct channel *ch = mpcginfo->ch; 1493 struct net_device *dev; 1494 struct ctcm_priv *priv; 1495 struct mpc_group *grp; 1496 1497 if (ch) { 1498 dev = ch->netdev; 1499 if (dev) { 1500 priv = dev->ml_priv; 1501 if (priv) { 1502 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1503 "%s: %s: %s\n", 1504 CTCM_FUNTAIL, dev->name, ch->id); 1505 grp = priv->mpcg; 1506 grp->send_qllc_disc = 1; 1507 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1508 } 1509 } 1510 } 1511 1512 return; 1513 } 1514 1515 /* 1516 * MPC Group Station - not part of FSM 1517 * CTCM_PROTO_MPC only 1518 * called from add_channel in ctcm_main.c 1519 */ 1520 void mpc_action_send_discontact(unsigned long thischan) 1521 { 1522 int rc; 1523 struct channel *ch = (struct channel *)thischan; 1524 unsigned long saveflags = 0; 1525 1526 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1527 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1528 (unsigned long)ch, 0xff, 0); 1529 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1530 1531 if (rc != 0) { 1532 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1533 } 1534 1535 return; 1536 } 1537 1538 1539 /* 1540 * helper function of mpc FSM 1541 * CTCM_PROTO_MPC only 1542 * mpc_action_rcvd_xid7 1543 */ 1544 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1545 { 1546 struct channel *ch = mpcginfo->ch; 1547 struct net_device *dev = ch->netdev; 1548 struct ctcm_priv *priv = dev->ml_priv; 1549 struct mpc_group *grp = priv->mpcg; 1550 struct xid2 *xid = mpcginfo->xid; 1551 int rc = 0; 1552 __u64 our_id = 0; 1553 __u64 their_id = 0; 1554 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1555 1556 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1557 1558 if (xid == NULL) { 1559 rc = 1; 1560 /* XID REJECTED: xid == NULL */ 1561 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1562 "%s(%s): xid = NULL", 1563 CTCM_FUNTAIL, ch->id); 1564 goto done; 1565 } 1566 1567 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1568 1569 /*the received direction should be the opposite of ours */ 1570 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1571 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1572 rc = 2; 1573 /* XID REJECTED: r/w channel pairing mismatch */ 1574 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1575 "%s(%s): r/w channel pairing mismatch", 1576 CTCM_FUNTAIL, ch->id); 1577 goto done; 1578 } 1579 1580 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1581 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1582 grp->group_max_buflen, xid->xid2_buf_len); 1583 1584 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1585 xid->xid2_buf_len - len) 1586 grp->group_max_buflen = xid->xid2_buf_len - len; 1587 } 1588 1589 if (grp->saved_xid2 == NULL) { 1590 grp->saved_xid2 = 1591 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1592 1593 memcpy(skb_put(grp->rcvd_xid_skb, 1594 XID2_LENGTH), xid, XID2_LENGTH); 1595 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1596 1597 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1598 grp->rcvd_xid_skb->len = 0; 1599 1600 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1601 our_id = (__u64)priv->xid->xid2_adj_id; 1602 our_id = our_id << 32; 1603 our_id = our_id + priv->xid->xid2_sender_id; 1604 their_id = (__u64)xid->xid2_adj_id; 1605 their_id = their_id << 32; 1606 their_id = their_id + xid->xid2_sender_id; 1607 /* lower id assume the xside role */ 1608 if (our_id < their_id) { 1609 grp->roll = XSIDE; 1610 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1611 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1612 CTCM_FUNTAIL, ch->id); 1613 } else { 1614 grp->roll = YSIDE; 1615 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1616 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1617 CTCM_FUNTAIL, ch->id); 1618 } 1619 1620 } else { 1621 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1622 rc = 3; 1623 /* XID REJECTED: xid flag byte4 mismatch */ 1624 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1625 "%s(%s): xid flag byte4 mismatch", 1626 CTCM_FUNTAIL, ch->id); 1627 } 1628 if (xid->xid2_flag2 == 0x40) { 1629 rc = 4; 1630 /* XID REJECTED - xid NOGOOD */ 1631 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1632 "%s(%s): xid NOGOOD", 1633 CTCM_FUNTAIL, ch->id); 1634 } 1635 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1636 rc = 5; 1637 /* XID REJECTED - Adjacent Station ID Mismatch */ 1638 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1639 "%s(%s): Adjacent Station ID Mismatch", 1640 CTCM_FUNTAIL, ch->id); 1641 } 1642 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1643 rc = 6; 1644 /* XID REJECTED - Sender Address Mismatch */ 1645 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1646 "%s(%s): Sender Address Mismatch", 1647 CTCM_FUNTAIL, ch->id); 1648 } 1649 } 1650 done: 1651 if (rc) { 1652 dev_warn(&dev->dev, 1653 "The XID used in the MPC protocol is not valid, " 1654 "rc = %d\n", rc); 1655 priv->xid->xid2_flag2 = 0x40; 1656 grp->saved_xid2->xid2_flag2 = 0x40; 1657 } 1658 1659 return rc; 1660 } 1661 1662 /* 1663 * MPC Group Station FSM action 1664 * CTCM_PROTO_MPC only 1665 */ 1666 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1667 { 1668 struct channel *ch = arg; 1669 int rc = 0; 1670 int gotlock = 0; 1671 unsigned long saveflags = 0; /* avoids compiler warning with 1672 spin_unlock_irqrestore */ 1673 1674 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1675 __func__, smp_processor_id(), ch, ch->id); 1676 1677 if (ctcm_checkalloc_buffer(ch)) 1678 goto done; 1679 1680 /* 1681 * skb data-buffer referencing: 1682 */ 1683 ch->trans_skb->data = ch->trans_skb_data; 1684 skb_reset_tail_pointer(ch->trans_skb); 1685 ch->trans_skb->len = 0; 1686 /* result of the previous 3 statements is NOT always 1687 * already set after ctcm_checkalloc_buffer 1688 * because of possible reuse of the trans_skb 1689 */ 1690 memset(ch->trans_skb->data, 0, 16); 1691 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1692 /* check is main purpose here: */ 1693 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1694 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1695 /* check is main purpose here: */ 1696 skb_put(ch->trans_skb, XID2_LENGTH); 1697 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1698 /* cleanup back to startpoint */ 1699 ch->trans_skb->data = ch->trans_skb_data; 1700 skb_reset_tail_pointer(ch->trans_skb); 1701 ch->trans_skb->len = 0; 1702 1703 /* non-checking rewrite of above skb data-buffer referencing: */ 1704 /* 1705 memset(ch->trans_skb->data, 0, 16); 1706 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1707 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1708 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1709 */ 1710 1711 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1712 ch->ccw[8].count = 0; 1713 ch->ccw[8].cda = 0x00; 1714 1715 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1716 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1717 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1718 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1719 1720 if (side == XSIDE) { 1721 /* mpc_action_xside_xid */ 1722 if (ch->xid_th == NULL) 1723 goto done; 1724 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1725 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1726 ch->ccw[9].count = TH_HEADER_LENGTH; 1727 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1728 1729 if (ch->xid == NULL) 1730 goto done; 1731 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1732 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1733 ch->ccw[10].count = XID2_LENGTH; 1734 ch->ccw[10].cda = virt_to_phys(ch->xid); 1735 1736 ch->ccw[11].cmd_code = CCW_CMD_READ; 1737 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1738 ch->ccw[11].count = TH_HEADER_LENGTH; 1739 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1740 1741 ch->ccw[12].cmd_code = CCW_CMD_READ; 1742 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1743 ch->ccw[12].count = XID2_LENGTH; 1744 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1745 1746 ch->ccw[13].cmd_code = CCW_CMD_READ; 1747 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1748 1749 } else { /* side == YSIDE : mpc_action_yside_xid */ 1750 ch->ccw[9].cmd_code = CCW_CMD_READ; 1751 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1752 ch->ccw[9].count = TH_HEADER_LENGTH; 1753 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1754 1755 ch->ccw[10].cmd_code = CCW_CMD_READ; 1756 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1757 ch->ccw[10].count = XID2_LENGTH; 1758 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1759 1760 if (ch->xid_th == NULL) 1761 goto done; 1762 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1763 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1764 ch->ccw[11].count = TH_HEADER_LENGTH; 1765 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1766 1767 if (ch->xid == NULL) 1768 goto done; 1769 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1770 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1771 ch->ccw[12].count = XID2_LENGTH; 1772 ch->ccw[12].cda = virt_to_phys(ch->xid); 1773 1774 if (ch->xid_id == NULL) 1775 goto done; 1776 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1777 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1778 1779 } 1780 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1781 ch->ccw[13].count = 4; 1782 1783 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1784 ch->ccw[14].flags = CCW_FLAG_SLI; 1785 ch->ccw[14].count = 0; 1786 ch->ccw[14].cda = 0; 1787 1788 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1789 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1790 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1791 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1792 1793 if (!in_irq()) { 1794 /* Such conditional locking is a known problem for 1795 * sparse because its static undeterministic. 1796 * Warnings should be ignored here. */ 1797 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1798 gotlock = 1; 1799 } 1800 1801 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1802 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1803 (unsigned long)ch, 0xff, 0); 1804 1805 if (gotlock) /* see remark above about conditional locking */ 1806 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1807 1808 if (rc != 0) { 1809 ctcm_ccw_check_rc(ch, rc, 1810 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1811 } 1812 1813 done: 1814 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1815 __func__, ch, ch->id); 1816 return; 1817 1818 } 1819 1820 /* 1821 * MPC Group Station FSM action 1822 * CTCM_PROTO_MPC only 1823 */ 1824 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1825 { 1826 mpc_action_side_xid(fsm, arg, XSIDE); 1827 } 1828 1829 /* 1830 * MPC Group Station FSM action 1831 * CTCM_PROTO_MPC only 1832 */ 1833 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1834 { 1835 mpc_action_side_xid(fsm, arg, YSIDE); 1836 } 1837 1838 /* 1839 * MPC Group Station FSM action 1840 * CTCM_PROTO_MPC only 1841 */ 1842 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1843 { 1844 struct channel *ch = arg; 1845 struct net_device *dev = ch->netdev; 1846 struct ctcm_priv *priv = dev->ml_priv; 1847 struct mpc_group *grp = priv->mpcg; 1848 1849 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1850 __func__, smp_processor_id(), ch, ch->id); 1851 1852 if (ch->xid == NULL) { 1853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1854 "%s(%s): ch->xid == NULL", 1855 CTCM_FUNTAIL, dev->name); 1856 return; 1857 } 1858 1859 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1860 1861 ch->xid->xid2_option = XID2_0; 1862 1863 switch (fsm_getstate(grp->fsm)) { 1864 case MPCG_STATE_XID2INITW: 1865 case MPCG_STATE_XID2INITX: 1866 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1867 break; 1868 case MPCG_STATE_XID0IOWAIT: 1869 case MPCG_STATE_XID0IOWAIX: 1870 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1871 break; 1872 } 1873 1874 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1875 1876 return; 1877 } 1878 1879 /* 1880 * MPC Group Station FSM action 1881 * CTCM_PROTO_MPC only 1882 */ 1883 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1884 { 1885 struct net_device *dev = arg; 1886 struct ctcm_priv *priv = dev->ml_priv; 1887 struct mpc_group *grp = NULL; 1888 int direction; 1889 int send = 0; 1890 1891 if (priv) 1892 grp = priv->mpcg; 1893 if (grp == NULL) 1894 return; 1895 1896 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1897 struct channel *ch = priv->channel[direction]; 1898 struct xid2 *thisxid = ch->xid; 1899 ch->xid_skb->data = ch->xid_skb_data; 1900 skb_reset_tail_pointer(ch->xid_skb); 1901 ch->xid_skb->len = 0; 1902 thisxid->xid2_option = XID2_7; 1903 send = 0; 1904 1905 /* xid7 phase 1 */ 1906 if (grp->outstanding_xid7_p2 > 0) { 1907 if (grp->roll == YSIDE) { 1908 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1909 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1910 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1911 memcpy(skb_put(ch->xid_skb, 1912 TH_HEADER_LENGTH), 1913 &thdummy, TH_HEADER_LENGTH); 1914 send = 1; 1915 } 1916 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1917 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1918 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1919 memcpy(skb_put(ch->xid_skb, 1920 TH_HEADER_LENGTH), 1921 &thnorm, TH_HEADER_LENGTH); 1922 send = 1; 1923 } 1924 } else { 1925 /* xid7 phase 2 */ 1926 if (grp->roll == YSIDE) { 1927 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1928 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1929 memcpy(skb_put(ch->xid_skb, 1930 TH_HEADER_LENGTH), 1931 &thnorm, TH_HEADER_LENGTH); 1932 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1933 send = 1; 1934 } 1935 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1936 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1937 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1938 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH), 1939 &thdummy, TH_HEADER_LENGTH); 1940 send = 1; 1941 } 1942 } 1943 1944 if (send) 1945 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1946 } 1947 1948 return; 1949 } 1950 1951 /* 1952 * MPC Group Station FSM action 1953 * CTCM_PROTO_MPC only 1954 */ 1955 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1956 { 1957 1958 struct mpcg_info *mpcginfo = arg; 1959 struct channel *ch = mpcginfo->ch; 1960 struct net_device *dev = ch->netdev; 1961 struct ctcm_priv *priv = dev->ml_priv; 1962 struct mpc_group *grp = priv->mpcg; 1963 1964 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1965 __func__, ch->id, grp->outstanding_xid2, 1966 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1967 1968 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1969 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1970 1971 grp->outstanding_xid2--; 1972 grp->outstanding_xid7++; 1973 grp->outstanding_xid7_p2++; 1974 1975 /* must change state before validating xid to */ 1976 /* properly handle interim interrupts received*/ 1977 switch (fsm_getstate(grp->fsm)) { 1978 case MPCG_STATE_XID2INITW: 1979 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1980 mpc_validate_xid(mpcginfo); 1981 break; 1982 case MPCG_STATE_XID0IOWAIT: 1983 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1984 mpc_validate_xid(mpcginfo); 1985 break; 1986 case MPCG_STATE_XID2INITX: 1987 if (grp->outstanding_xid2 == 0) { 1988 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1989 mpc_validate_xid(mpcginfo); 1990 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1991 } 1992 break; 1993 case MPCG_STATE_XID0IOWAIX: 1994 if (grp->outstanding_xid2 == 0) { 1995 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1996 mpc_validate_xid(mpcginfo); 1997 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1998 } 1999 break; 2000 } 2001 kfree(mpcginfo); 2002 2003 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 2004 __func__, ch->id, grp->outstanding_xid2, 2005 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2006 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2007 __func__, ch->id, 2008 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2009 return; 2010 2011 } 2012 2013 2014 /* 2015 * MPC Group Station FSM action 2016 * CTCM_PROTO_MPC only 2017 */ 2018 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2019 { 2020 struct mpcg_info *mpcginfo = arg; 2021 struct channel *ch = mpcginfo->ch; 2022 struct net_device *dev = ch->netdev; 2023 struct ctcm_priv *priv = dev->ml_priv; 2024 struct mpc_group *grp = priv->mpcg; 2025 2026 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2027 __func__, smp_processor_id(), ch, ch->id); 2028 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2029 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2030 2031 grp->outstanding_xid7--; 2032 ch->xid_skb->data = ch->xid_skb_data; 2033 skb_reset_tail_pointer(ch->xid_skb); 2034 ch->xid_skb->len = 0; 2035 2036 switch (fsm_getstate(grp->fsm)) { 2037 case MPCG_STATE_XID7INITI: 2038 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2039 mpc_validate_xid(mpcginfo); 2040 break; 2041 case MPCG_STATE_XID7INITW: 2042 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2043 mpc_validate_xid(mpcginfo); 2044 break; 2045 case MPCG_STATE_XID7INITZ: 2046 case MPCG_STATE_XID7INITX: 2047 if (grp->outstanding_xid7 == 0) { 2048 if (grp->outstanding_xid7_p2 > 0) { 2049 grp->outstanding_xid7 = 2050 grp->outstanding_xid7_p2; 2051 grp->outstanding_xid7_p2 = 0; 2052 } else 2053 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2054 2055 mpc_validate_xid(mpcginfo); 2056 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2057 break; 2058 } 2059 mpc_validate_xid(mpcginfo); 2060 break; 2061 } 2062 kfree(mpcginfo); 2063 return; 2064 } 2065 2066 /* 2067 * mpc_action helper of an MPC Group Station FSM action 2068 * CTCM_PROTO_MPC only 2069 */ 2070 static int mpc_send_qllc_discontact(struct net_device *dev) 2071 { 2072 __u32 new_len = 0; 2073 struct sk_buff *skb; 2074 struct qllc *qllcptr; 2075 struct ctcm_priv *priv = dev->ml_priv; 2076 struct mpc_group *grp = priv->mpcg; 2077 2078 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2079 __func__, mpcg_state_names[grp->saved_state]); 2080 2081 switch (grp->saved_state) { 2082 /* 2083 * establish conn callback function is 2084 * preferred method to report failure 2085 */ 2086 case MPCG_STATE_XID0IOWAIT: 2087 case MPCG_STATE_XID0IOWAIX: 2088 case MPCG_STATE_XID7INITI: 2089 case MPCG_STATE_XID7INITZ: 2090 case MPCG_STATE_XID2INITW: 2091 case MPCG_STATE_XID2INITX: 2092 case MPCG_STATE_XID7INITW: 2093 case MPCG_STATE_XID7INITX: 2094 if (grp->estconnfunc) { 2095 grp->estconnfunc(grp->port_num, -1, 0); 2096 grp->estconnfunc = NULL; 2097 break; 2098 } 2099 case MPCG_STATE_FLOWC: 2100 case MPCG_STATE_READY: 2101 grp->send_qllc_disc = 2; 2102 new_len = sizeof(struct qllc); 2103 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2104 if (qllcptr == NULL) { 2105 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2106 "%s(%s): qllcptr allocation error", 2107 CTCM_FUNTAIL, dev->name); 2108 return -ENOMEM; 2109 } 2110 2111 qllcptr->qllc_address = 0xcc; 2112 qllcptr->qllc_commands = 0x03; 2113 2114 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2115 2116 if (skb == NULL) { 2117 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2118 "%s(%s): skb allocation error", 2119 CTCM_FUNTAIL, dev->name); 2120 priv->stats.rx_dropped++; 2121 kfree(qllcptr); 2122 return -ENOMEM; 2123 } 2124 2125 memcpy(skb_put(skb, new_len), qllcptr, new_len); 2126 kfree(qllcptr); 2127 2128 if (skb_headroom(skb) < 4) { 2129 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2130 "%s(%s): skb_headroom error", 2131 CTCM_FUNTAIL, dev->name); 2132 dev_kfree_skb_any(skb); 2133 return -ENOMEM; 2134 } 2135 2136 *((__u32 *)skb_push(skb, 4)) = 2137 priv->channel[CTCM_READ]->pdu_seq; 2138 priv->channel[CTCM_READ]->pdu_seq++; 2139 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2140 __func__, priv->channel[CTCM_READ]->pdu_seq); 2141 2142 /* receipt of CC03 resets anticipated sequence number on 2143 receiving side */ 2144 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2145 skb_reset_mac_header(skb); 2146 skb->dev = dev; 2147 skb->protocol = htons(ETH_P_SNAP); 2148 skb->ip_summed = CHECKSUM_UNNECESSARY; 2149 2150 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2151 2152 netif_rx(skb); 2153 break; 2154 default: 2155 break; 2156 2157 } 2158 2159 return 0; 2160 } 2161 /* --- This is the END my friend --- */ 2162 2163