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 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 671 672 kfree(header); 673 674 netif_trans_update(dev); 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 skb_put_data(ch->xid_skb, grp->xid_skb->data, 978 grp->xid_skb->len); 979 980 ch->xid->xid2_dlc_type = 981 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 982 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 983 984 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 985 ch->xid->xid2_buf_len = 0x00; 986 987 ch->xid_skb->data = ch->xid_skb_data; 988 skb_reset_tail_pointer(ch->xid_skb); 989 ch->xid_skb->len = 0; 990 991 fsm_newstate(ch->fsm, CH_XID0_PENDING); 992 993 if ((grp->active_channels[CTCM_READ] > 0) && 994 (grp->active_channels[CTCM_WRITE] > 0) && 995 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 996 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 997 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 998 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 999 __func__, dev->name); 1000 } 1001 } else if ((action == MPC_CHANNEL_REMOVE) && 1002 (ch->in_mpcgroup == 1)) { 1003 ch->in_mpcgroup = 0; 1004 grp->num_channel_paths--; 1005 grp->active_channels[direction]--; 1006 1007 if (ch->xid_skb != NULL) 1008 dev_kfree_skb_any(ch->xid_skb); 1009 ch->xid_skb = NULL; 1010 1011 if (grp->channels_terminating) 1012 goto done; 1013 1014 if (((grp->active_channels[CTCM_READ] == 0) && 1015 (grp->active_channels[CTCM_WRITE] > 0)) 1016 || ((grp->active_channels[CTCM_WRITE] == 0) && 1017 (grp->active_channels[CTCM_READ] > 0))) 1018 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1019 } 1020 done: 1021 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1022 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1023 "read=%i, write=%i\n", __func__, action, 1024 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1025 grp->active_channels[CTCM_READ], 1026 grp->active_channels[CTCM_WRITE]); 1027 1028 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1029 } 1030 1031 /** 1032 * Unpack a just received skb and hand it over to 1033 * upper layers. 1034 * special MPC version of unpack_skb. 1035 * 1036 * ch The channel where this skb has been received. 1037 * pskb The received skb. 1038 */ 1039 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1040 { 1041 struct net_device *dev = ch->netdev; 1042 struct ctcm_priv *priv = dev->ml_priv; 1043 struct mpc_group *grp = priv->mpcg; 1044 struct pdu *curr_pdu; 1045 struct mpcg_info *mpcginfo; 1046 struct th_header *header = NULL; 1047 struct th_sweep *sweep = NULL; 1048 int pdu_last_seen = 0; 1049 __u32 new_len; 1050 struct sk_buff *skb; 1051 int skblen; 1052 int sendrc = 0; 1053 1054 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1055 __func__, dev->name, smp_processor_id(), ch->id); 1056 1057 header = (struct th_header *)pskb->data; 1058 if ((header->th_seg == 0) && 1059 (header->th_ch_flag == 0) && 1060 (header->th_blk_flag == 0) && 1061 (header->th_seq_num == 0)) 1062 /* nothing for us */ goto done; 1063 1064 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1065 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1066 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1067 1068 pskb->dev = dev; 1069 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1070 skb_pull(pskb, TH_HEADER_LENGTH); 1071 1072 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1073 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1074 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1075 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1076 (header->th_seq_num != ch->th_seq_num + 1) && 1077 (ch->th_seq_num != 0))) { 1078 /* This is NOT the next segment * 1079 * we are not the correct race winner * 1080 * go away and let someone else win * 1081 * BUT..this only applies if xid negot * 1082 * is done * 1083 */ 1084 grp->out_of_sequence += 1; 1085 __skb_push(pskb, TH_HEADER_LENGTH); 1086 skb_queue_tail(&ch->io_queue, pskb); 1087 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1088 "got:%08x\n", __func__, 1089 ch->th_seq_num + 1, header->th_seq_num); 1090 1091 return; 1092 } 1093 grp->out_of_sequence = 0; 1094 ch->th_seq_num = header->th_seq_num; 1095 1096 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1097 __func__, ch->th_seq_num); 1098 1099 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1100 goto done; 1101 while ((pskb->len > 0) && !pdu_last_seen) { 1102 curr_pdu = (struct pdu *)pskb->data; 1103 1104 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1105 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1106 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1107 __func__, pskb->len); 1108 1109 skb_pull(pskb, PDU_HEADER_LENGTH); 1110 1111 if (curr_pdu->pdu_flag & PDU_LAST) 1112 pdu_last_seen = 1; 1113 if (curr_pdu->pdu_flag & PDU_CNTL) 1114 pskb->protocol = htons(ETH_P_SNAP); 1115 else 1116 pskb->protocol = htons(ETH_P_SNA_DIX); 1117 1118 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1120 "%s(%s): Dropping packet with " 1121 "illegal siize %d", 1122 CTCM_FUNTAIL, dev->name, pskb->len); 1123 1124 priv->stats.rx_dropped++; 1125 priv->stats.rx_length_errors++; 1126 goto done; 1127 } 1128 skb_reset_mac_header(pskb); 1129 new_len = curr_pdu->pdu_offset; 1130 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1131 __func__, new_len); 1132 if ((new_len == 0) || (new_len > pskb->len)) { 1133 /* should never happen */ 1134 /* pskb len must be hosed...bail out */ 1135 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1136 "%s(%s): non valid pdu_offset: %04x", 1137 /* "data may be lost", */ 1138 CTCM_FUNTAIL, dev->name, new_len); 1139 goto done; 1140 } 1141 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1142 1143 if (!skb) { 1144 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1145 "%s(%s): MEMORY allocation error", 1146 CTCM_FUNTAIL, dev->name); 1147 priv->stats.rx_dropped++; 1148 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1149 goto done; 1150 } 1151 skb_put_data(skb, pskb->data, new_len); 1152 1153 skb_reset_mac_header(skb); 1154 skb->dev = pskb->dev; 1155 skb->protocol = pskb->protocol; 1156 skb->ip_summed = CHECKSUM_UNNECESSARY; 1157 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1158 ch->pdu_seq++; 1159 1160 if (do_debug_data) { 1161 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1162 __func__, ch->pdu_seq); 1163 ctcm_pr_debug("%s: skb:%0lx " 1164 "skb len: %d \n", __func__, 1165 (unsigned long)skb, skb->len); 1166 ctcm_pr_debug("%s: up to 32 bytes " 1167 "of pdu_data sent\n", __func__); 1168 ctcmpc_dump32((char *)skb->data, skb->len); 1169 } 1170 1171 skblen = skb->len; 1172 sendrc = netif_rx(skb); 1173 priv->stats.rx_packets++; 1174 priv->stats.rx_bytes += skblen; 1175 skb_pull(pskb, new_len); /* point to next PDU */ 1176 } 1177 } else { 1178 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1179 if (mpcginfo == NULL) 1180 goto done; 1181 1182 mpcginfo->ch = ch; 1183 mpcginfo->th = header; 1184 mpcginfo->skb = pskb; 1185 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1186 __func__); 1187 /* it's a sweep? */ 1188 sweep = (struct th_sweep *)pskb->data; 1189 mpcginfo->sweep = sweep; 1190 if (header->th_ch_flag == TH_SWEEP_REQ) 1191 mpc_rcvd_sweep_req(mpcginfo); 1192 else if (header->th_ch_flag == TH_SWEEP_RESP) 1193 mpc_rcvd_sweep_resp(mpcginfo); 1194 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1195 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1196 skb_pull(pskb, XID2_LENGTH); 1197 mpcginfo->xid = thisxid; 1198 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1199 } else if (header->th_blk_flag == TH_DISCONTACT) 1200 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1201 else if (header->th_seq_num != 0) { 1202 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1203 "%s(%s): control pkt expected\n", 1204 CTCM_FUNTAIL, dev->name); 1205 priv->stats.rx_dropped++; 1206 /* mpcginfo only used for non-data transfers */ 1207 kfree(mpcginfo); 1208 if (do_debug_data) 1209 ctcmpc_dump_skb(pskb, -8); 1210 } 1211 } 1212 done: 1213 1214 dev_kfree_skb_any(pskb); 1215 if (sendrc == NET_RX_DROP) { 1216 dev_warn(&dev->dev, 1217 "The network backlog for %s is exceeded, " 1218 "package dropped\n", __func__); 1219 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1220 } 1221 1222 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1223 __func__, dev->name, ch, ch->id); 1224 } 1225 1226 /** 1227 * tasklet helper for mpc's skb unpacking. 1228 * 1229 * ch The channel to work on. 1230 * Allow flow control back pressure to occur here. 1231 * Throttling back channel can result in excessive 1232 * channel inactivity and system deact of channel 1233 */ 1234 void ctcmpc_bh(unsigned long thischan) 1235 { 1236 struct channel *ch = (struct channel *)thischan; 1237 struct sk_buff *skb; 1238 struct net_device *dev = ch->netdev; 1239 struct ctcm_priv *priv = dev->ml_priv; 1240 struct mpc_group *grp = priv->mpcg; 1241 1242 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1243 dev->name, smp_processor_id(), __func__, ch->id); 1244 /* caller has requested driver to throttle back */ 1245 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1246 (skb = skb_dequeue(&ch->io_queue))) { 1247 ctcmpc_unpack_skb(ch, skb); 1248 if (grp->out_of_sequence > 20) { 1249 /* assume data loss has occurred if */ 1250 /* missing seq_num for extended */ 1251 /* period of time */ 1252 grp->out_of_sequence = 0; 1253 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1254 break; 1255 } 1256 if (skb == skb_peek(&ch->io_queue)) 1257 break; 1258 } 1259 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1260 __func__, dev->name, ch, ch->id); 1261 return; 1262 } 1263 1264 /* 1265 * MPC Group Initializations 1266 */ 1267 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1268 { 1269 struct mpc_group *grp; 1270 1271 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1272 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1273 1274 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1275 if (grp == NULL) 1276 return NULL; 1277 1278 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1279 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1280 mpcg_fsm_len, GFP_KERNEL); 1281 if (grp->fsm == NULL) { 1282 kfree(grp); 1283 return NULL; 1284 } 1285 1286 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1287 fsm_settimer(grp->fsm, &grp->timer); 1288 1289 grp->xid_skb = 1290 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1291 if (grp->xid_skb == NULL) { 1292 kfree_fsm(grp->fsm); 1293 kfree(grp); 1294 return NULL; 1295 } 1296 /* base xid for all channels in group */ 1297 grp->xid_skb_data = grp->xid_skb->data; 1298 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1299 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1300 1301 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1302 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1303 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1304 grp->xid->xid2_sender_id = jiffies; 1305 1306 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1307 skb_put_data(grp->xid_skb, "VTAM", 4); 1308 1309 grp->rcvd_xid_skb = 1310 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1311 if (grp->rcvd_xid_skb == NULL) { 1312 kfree_fsm(grp->fsm); 1313 dev_kfree_skb(grp->xid_skb); 1314 kfree(grp); 1315 return NULL; 1316 } 1317 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1318 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1319 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1320 grp->saved_xid2 = NULL; 1321 priv->xid = grp->xid; 1322 priv->mpcg = grp; 1323 return grp; 1324 } 1325 1326 /* 1327 * The MPC Group Station FSM 1328 */ 1329 1330 /* 1331 * MPC Group Station FSM actions 1332 * CTCM_PROTO_MPC only 1333 */ 1334 1335 /** 1336 * NOP action for statemachines 1337 */ 1338 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1339 { 1340 } 1341 1342 /* 1343 * invoked when the device transitions to dev_stopped 1344 * MPC will stop each individual channel if a single XID failure 1345 * occurs, or will intitiate all channels be stopped if a GROUP 1346 * level failure occurs. 1347 */ 1348 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1349 { 1350 struct net_device *dev = arg; 1351 struct ctcm_priv *priv; 1352 struct mpc_group *grp; 1353 struct channel *wch; 1354 1355 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1356 1357 priv = dev->ml_priv; 1358 grp = priv->mpcg; 1359 grp->flow_off_called = 0; 1360 fsm_deltimer(&grp->timer); 1361 if (grp->channels_terminating) 1362 return; 1363 1364 grp->channels_terminating = 1; 1365 grp->saved_state = fsm_getstate(grp->fsm); 1366 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1367 if (grp->saved_state > MPCG_STATE_XID7INITF) 1368 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1369 "%s(%s): MPC GROUP INOPERATIVE", 1370 CTCM_FUNTAIL, dev->name); 1371 if ((grp->saved_state != MPCG_STATE_RESET) || 1372 /* dealloc_channel has been called */ 1373 (grp->port_persist == 0)) 1374 fsm_deltimer(&priv->restart_timer); 1375 1376 wch = priv->channel[CTCM_WRITE]; 1377 1378 switch (grp->saved_state) { 1379 case MPCG_STATE_RESET: 1380 case MPCG_STATE_INOP: 1381 case MPCG_STATE_XID2INITW: 1382 case MPCG_STATE_XID0IOWAIT: 1383 case MPCG_STATE_XID2INITX: 1384 case MPCG_STATE_XID7INITW: 1385 case MPCG_STATE_XID7INITX: 1386 case MPCG_STATE_XID0IOWAIX: 1387 case MPCG_STATE_XID7INITI: 1388 case MPCG_STATE_XID7INITZ: 1389 case MPCG_STATE_XID7INITF: 1390 break; 1391 case MPCG_STATE_FLOWC: 1392 case MPCG_STATE_READY: 1393 default: 1394 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1395 } 1396 1397 grp->xid2_tgnum = 0; 1398 grp->group_max_buflen = 0; /*min of all received */ 1399 grp->outstanding_xid2 = 0; 1400 grp->outstanding_xid7 = 0; 1401 grp->outstanding_xid7_p2 = 0; 1402 grp->saved_xid2 = NULL; 1403 grp->xidnogood = 0; 1404 grp->changed_side = 0; 1405 1406 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1407 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1408 grp->rcvd_xid_skb->len = 0; 1409 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1410 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1411 1412 if (grp->send_qllc_disc == 1) { 1413 grp->send_qllc_disc = 0; 1414 mpc_send_qllc_discontact(dev); 1415 } 1416 1417 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1418 /* This can result in INOP of VTAM PU due to halting of */ 1419 /* outstanding IO which causes a sense to be returned */ 1420 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1421 /* become unreachable without manual intervention */ 1422 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1423 grp->alloc_called = 0; 1424 fsm_deltimer(&priv->restart_timer); 1425 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1426 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1427 if (grp->saved_state > MPCG_STATE_XID7INITF) 1428 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1429 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1430 CTCM_FUNTAIL, dev->name); 1431 } else { 1432 fsm_deltimer(&priv->restart_timer); 1433 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1434 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1435 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1436 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1437 CTCM_FUNTAIL, dev->name); 1438 } 1439 } 1440 1441 /** 1442 * Handle mpc group action timeout. 1443 * MPC Group Station FSM action 1444 * CTCM_PROTO_MPC only 1445 * 1446 * fi An instance of an mpc_group fsm. 1447 * event The event, just happened. 1448 * arg Generic pointer, casted from net_device * upon call. 1449 */ 1450 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1451 { 1452 struct net_device *dev = arg; 1453 struct ctcm_priv *priv; 1454 struct mpc_group *grp; 1455 struct channel *wch; 1456 struct channel *rch; 1457 1458 priv = dev->ml_priv; 1459 grp = priv->mpcg; 1460 wch = priv->channel[CTCM_WRITE]; 1461 rch = priv->channel[CTCM_READ]; 1462 1463 switch (fsm_getstate(grp->fsm)) { 1464 case MPCG_STATE_XID2INITW: 1465 /* Unless there is outstanding IO on the */ 1466 /* channel just return and wait for ATTN */ 1467 /* interrupt to begin XID negotiations */ 1468 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1469 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1470 break; 1471 default: 1472 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1473 } 1474 1475 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1476 "%s: dev=%s exit", 1477 CTCM_FUNTAIL, dev->name); 1478 return; 1479 } 1480 1481 /* 1482 * MPC Group Station FSM action 1483 * CTCM_PROTO_MPC only 1484 */ 1485 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1486 { 1487 struct mpcg_info *mpcginfo = arg; 1488 struct channel *ch = mpcginfo->ch; 1489 struct net_device *dev; 1490 struct ctcm_priv *priv; 1491 struct mpc_group *grp; 1492 1493 if (ch) { 1494 dev = ch->netdev; 1495 if (dev) { 1496 priv = dev->ml_priv; 1497 if (priv) { 1498 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1499 "%s: %s: %s\n", 1500 CTCM_FUNTAIL, dev->name, ch->id); 1501 grp = priv->mpcg; 1502 grp->send_qllc_disc = 1; 1503 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1504 } 1505 } 1506 } 1507 1508 return; 1509 } 1510 1511 /* 1512 * MPC Group Station - not part of FSM 1513 * CTCM_PROTO_MPC only 1514 * called from add_channel in ctcm_main.c 1515 */ 1516 void mpc_action_send_discontact(unsigned long thischan) 1517 { 1518 int rc; 1519 struct channel *ch = (struct channel *)thischan; 1520 unsigned long saveflags = 0; 1521 1522 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1523 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1524 (unsigned long)ch, 0xff, 0); 1525 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1526 1527 if (rc != 0) { 1528 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1529 } 1530 1531 return; 1532 } 1533 1534 1535 /* 1536 * helper function of mpc FSM 1537 * CTCM_PROTO_MPC only 1538 * mpc_action_rcvd_xid7 1539 */ 1540 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1541 { 1542 struct channel *ch = mpcginfo->ch; 1543 struct net_device *dev = ch->netdev; 1544 struct ctcm_priv *priv = dev->ml_priv; 1545 struct mpc_group *grp = priv->mpcg; 1546 struct xid2 *xid = mpcginfo->xid; 1547 int rc = 0; 1548 __u64 our_id = 0; 1549 __u64 their_id = 0; 1550 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1551 1552 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1553 1554 if (xid == NULL) { 1555 rc = 1; 1556 /* XID REJECTED: xid == NULL */ 1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1558 "%s(%s): xid = NULL", 1559 CTCM_FUNTAIL, ch->id); 1560 goto done; 1561 } 1562 1563 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1564 1565 /*the received direction should be the opposite of ours */ 1566 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1567 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1568 rc = 2; 1569 /* XID REJECTED: r/w channel pairing mismatch */ 1570 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1571 "%s(%s): r/w channel pairing mismatch", 1572 CTCM_FUNTAIL, ch->id); 1573 goto done; 1574 } 1575 1576 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1577 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1578 grp->group_max_buflen, xid->xid2_buf_len); 1579 1580 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1581 xid->xid2_buf_len - len) 1582 grp->group_max_buflen = xid->xid2_buf_len - len; 1583 } 1584 1585 if (grp->saved_xid2 == NULL) { 1586 grp->saved_xid2 = 1587 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1588 1589 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1590 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1591 1592 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1593 grp->rcvd_xid_skb->len = 0; 1594 1595 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1596 our_id = (__u64)priv->xid->xid2_adj_id; 1597 our_id = our_id << 32; 1598 our_id = our_id + priv->xid->xid2_sender_id; 1599 their_id = (__u64)xid->xid2_adj_id; 1600 their_id = their_id << 32; 1601 their_id = their_id + xid->xid2_sender_id; 1602 /* lower id assume the xside role */ 1603 if (our_id < their_id) { 1604 grp->roll = XSIDE; 1605 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1606 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1607 CTCM_FUNTAIL, ch->id); 1608 } else { 1609 grp->roll = YSIDE; 1610 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1611 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1612 CTCM_FUNTAIL, ch->id); 1613 } 1614 1615 } else { 1616 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1617 rc = 3; 1618 /* XID REJECTED: xid flag byte4 mismatch */ 1619 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1620 "%s(%s): xid flag byte4 mismatch", 1621 CTCM_FUNTAIL, ch->id); 1622 } 1623 if (xid->xid2_flag2 == 0x40) { 1624 rc = 4; 1625 /* XID REJECTED - xid NOGOOD */ 1626 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1627 "%s(%s): xid NOGOOD", 1628 CTCM_FUNTAIL, ch->id); 1629 } 1630 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1631 rc = 5; 1632 /* XID REJECTED - Adjacent Station ID Mismatch */ 1633 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1634 "%s(%s): Adjacent Station ID Mismatch", 1635 CTCM_FUNTAIL, ch->id); 1636 } 1637 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1638 rc = 6; 1639 /* XID REJECTED - Sender Address Mismatch */ 1640 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1641 "%s(%s): Sender Address Mismatch", 1642 CTCM_FUNTAIL, ch->id); 1643 } 1644 } 1645 done: 1646 if (rc) { 1647 dev_warn(&dev->dev, 1648 "The XID used in the MPC protocol is not valid, " 1649 "rc = %d\n", rc); 1650 priv->xid->xid2_flag2 = 0x40; 1651 grp->saved_xid2->xid2_flag2 = 0x40; 1652 } 1653 1654 return rc; 1655 } 1656 1657 /* 1658 * MPC Group Station FSM action 1659 * CTCM_PROTO_MPC only 1660 */ 1661 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1662 { 1663 struct channel *ch = arg; 1664 int rc = 0; 1665 int gotlock = 0; 1666 unsigned long saveflags = 0; /* avoids compiler warning with 1667 spin_unlock_irqrestore */ 1668 1669 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1670 __func__, smp_processor_id(), ch, ch->id); 1671 1672 if (ctcm_checkalloc_buffer(ch)) 1673 goto done; 1674 1675 /* 1676 * skb data-buffer referencing: 1677 */ 1678 ch->trans_skb->data = ch->trans_skb_data; 1679 skb_reset_tail_pointer(ch->trans_skb); 1680 ch->trans_skb->len = 0; 1681 /* result of the previous 3 statements is NOT always 1682 * already set after ctcm_checkalloc_buffer 1683 * because of possible reuse of the trans_skb 1684 */ 1685 memset(ch->trans_skb->data, 0, 16); 1686 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1687 /* check is main purpose here: */ 1688 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1689 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1690 /* check is main purpose here: */ 1691 skb_put(ch->trans_skb, XID2_LENGTH); 1692 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1693 /* cleanup back to startpoint */ 1694 ch->trans_skb->data = ch->trans_skb_data; 1695 skb_reset_tail_pointer(ch->trans_skb); 1696 ch->trans_skb->len = 0; 1697 1698 /* non-checking rewrite of above skb data-buffer referencing: */ 1699 /* 1700 memset(ch->trans_skb->data, 0, 16); 1701 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1702 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1703 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1704 */ 1705 1706 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1707 ch->ccw[8].count = 0; 1708 ch->ccw[8].cda = 0x00; 1709 1710 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1711 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1712 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1713 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1714 1715 if (side == XSIDE) { 1716 /* mpc_action_xside_xid */ 1717 if (ch->xid_th == NULL) 1718 goto done; 1719 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1720 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1721 ch->ccw[9].count = TH_HEADER_LENGTH; 1722 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1723 1724 if (ch->xid == NULL) 1725 goto done; 1726 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1727 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1728 ch->ccw[10].count = XID2_LENGTH; 1729 ch->ccw[10].cda = virt_to_phys(ch->xid); 1730 1731 ch->ccw[11].cmd_code = CCW_CMD_READ; 1732 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1733 ch->ccw[11].count = TH_HEADER_LENGTH; 1734 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1735 1736 ch->ccw[12].cmd_code = CCW_CMD_READ; 1737 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1738 ch->ccw[12].count = XID2_LENGTH; 1739 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1740 1741 ch->ccw[13].cmd_code = CCW_CMD_READ; 1742 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1743 1744 } else { /* side == YSIDE : mpc_action_yside_xid */ 1745 ch->ccw[9].cmd_code = CCW_CMD_READ; 1746 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1747 ch->ccw[9].count = TH_HEADER_LENGTH; 1748 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1749 1750 ch->ccw[10].cmd_code = CCW_CMD_READ; 1751 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1752 ch->ccw[10].count = XID2_LENGTH; 1753 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1754 1755 if (ch->xid_th == NULL) 1756 goto done; 1757 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1758 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1759 ch->ccw[11].count = TH_HEADER_LENGTH; 1760 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1761 1762 if (ch->xid == NULL) 1763 goto done; 1764 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1765 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1766 ch->ccw[12].count = XID2_LENGTH; 1767 ch->ccw[12].cda = virt_to_phys(ch->xid); 1768 1769 if (ch->xid_id == NULL) 1770 goto done; 1771 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1772 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1773 1774 } 1775 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1776 ch->ccw[13].count = 4; 1777 1778 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1779 ch->ccw[14].flags = CCW_FLAG_SLI; 1780 ch->ccw[14].count = 0; 1781 ch->ccw[14].cda = 0; 1782 1783 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1784 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1785 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1786 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1787 1788 if (!in_irq()) { 1789 /* Such conditional locking is a known problem for 1790 * sparse because its static undeterministic. 1791 * Warnings should be ignored here. */ 1792 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1793 gotlock = 1; 1794 } 1795 1796 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1797 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1798 (unsigned long)ch, 0xff, 0); 1799 1800 if (gotlock) /* see remark above about conditional locking */ 1801 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1802 1803 if (rc != 0) { 1804 ctcm_ccw_check_rc(ch, rc, 1805 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1806 } 1807 1808 done: 1809 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1810 __func__, ch, ch->id); 1811 return; 1812 1813 } 1814 1815 /* 1816 * MPC Group Station FSM action 1817 * CTCM_PROTO_MPC only 1818 */ 1819 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1820 { 1821 mpc_action_side_xid(fsm, arg, XSIDE); 1822 } 1823 1824 /* 1825 * MPC Group Station FSM action 1826 * CTCM_PROTO_MPC only 1827 */ 1828 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1829 { 1830 mpc_action_side_xid(fsm, arg, YSIDE); 1831 } 1832 1833 /* 1834 * MPC Group Station FSM action 1835 * CTCM_PROTO_MPC only 1836 */ 1837 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1838 { 1839 struct channel *ch = arg; 1840 struct net_device *dev = ch->netdev; 1841 struct ctcm_priv *priv = dev->ml_priv; 1842 struct mpc_group *grp = priv->mpcg; 1843 1844 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1845 __func__, smp_processor_id(), ch, ch->id); 1846 1847 if (ch->xid == NULL) { 1848 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1849 "%s(%s): ch->xid == NULL", 1850 CTCM_FUNTAIL, dev->name); 1851 return; 1852 } 1853 1854 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1855 1856 ch->xid->xid2_option = XID2_0; 1857 1858 switch (fsm_getstate(grp->fsm)) { 1859 case MPCG_STATE_XID2INITW: 1860 case MPCG_STATE_XID2INITX: 1861 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1862 break; 1863 case MPCG_STATE_XID0IOWAIT: 1864 case MPCG_STATE_XID0IOWAIX: 1865 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1866 break; 1867 } 1868 1869 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1870 1871 return; 1872 } 1873 1874 /* 1875 * MPC Group Station FSM action 1876 * CTCM_PROTO_MPC only 1877 */ 1878 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1879 { 1880 struct net_device *dev = arg; 1881 struct ctcm_priv *priv = dev->ml_priv; 1882 struct mpc_group *grp = NULL; 1883 int direction; 1884 int send = 0; 1885 1886 if (priv) 1887 grp = priv->mpcg; 1888 if (grp == NULL) 1889 return; 1890 1891 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1892 struct channel *ch = priv->channel[direction]; 1893 struct xid2 *thisxid = ch->xid; 1894 ch->xid_skb->data = ch->xid_skb_data; 1895 skb_reset_tail_pointer(ch->xid_skb); 1896 ch->xid_skb->len = 0; 1897 thisxid->xid2_option = XID2_7; 1898 send = 0; 1899 1900 /* xid7 phase 1 */ 1901 if (grp->outstanding_xid7_p2 > 0) { 1902 if (grp->roll == YSIDE) { 1903 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1904 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1905 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1906 skb_put_data(ch->xid_skb, &thdummy, 1907 TH_HEADER_LENGTH); 1908 send = 1; 1909 } 1910 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1911 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1912 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1913 skb_put_data(ch->xid_skb, &thnorm, 1914 TH_HEADER_LENGTH); 1915 send = 1; 1916 } 1917 } else { 1918 /* xid7 phase 2 */ 1919 if (grp->roll == YSIDE) { 1920 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1921 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1922 skb_put_data(ch->xid_skb, &thnorm, 1923 TH_HEADER_LENGTH); 1924 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1925 send = 1; 1926 } 1927 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1928 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1929 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1930 skb_put_data(ch->xid_skb, &thdummy, 1931 TH_HEADER_LENGTH); 1932 send = 1; 1933 } 1934 } 1935 1936 if (send) 1937 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1938 } 1939 1940 return; 1941 } 1942 1943 /* 1944 * MPC Group Station FSM action 1945 * CTCM_PROTO_MPC only 1946 */ 1947 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1948 { 1949 1950 struct mpcg_info *mpcginfo = arg; 1951 struct channel *ch = mpcginfo->ch; 1952 struct net_device *dev = ch->netdev; 1953 struct ctcm_priv *priv = dev->ml_priv; 1954 struct mpc_group *grp = priv->mpcg; 1955 1956 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1957 __func__, ch->id, grp->outstanding_xid2, 1958 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1959 1960 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1961 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1962 1963 grp->outstanding_xid2--; 1964 grp->outstanding_xid7++; 1965 grp->outstanding_xid7_p2++; 1966 1967 /* must change state before validating xid to */ 1968 /* properly handle interim interrupts received*/ 1969 switch (fsm_getstate(grp->fsm)) { 1970 case MPCG_STATE_XID2INITW: 1971 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1972 mpc_validate_xid(mpcginfo); 1973 break; 1974 case MPCG_STATE_XID0IOWAIT: 1975 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1976 mpc_validate_xid(mpcginfo); 1977 break; 1978 case MPCG_STATE_XID2INITX: 1979 if (grp->outstanding_xid2 == 0) { 1980 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1981 mpc_validate_xid(mpcginfo); 1982 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1983 } 1984 break; 1985 case MPCG_STATE_XID0IOWAIX: 1986 if (grp->outstanding_xid2 == 0) { 1987 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1988 mpc_validate_xid(mpcginfo); 1989 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1990 } 1991 break; 1992 } 1993 kfree(mpcginfo); 1994 1995 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1996 __func__, ch->id, grp->outstanding_xid2, 1997 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1998 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 1999 __func__, ch->id, 2000 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2001 return; 2002 2003 } 2004 2005 2006 /* 2007 * MPC Group Station FSM action 2008 * CTCM_PROTO_MPC only 2009 */ 2010 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2011 { 2012 struct mpcg_info *mpcginfo = arg; 2013 struct channel *ch = mpcginfo->ch; 2014 struct net_device *dev = ch->netdev; 2015 struct ctcm_priv *priv = dev->ml_priv; 2016 struct mpc_group *grp = priv->mpcg; 2017 2018 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2019 __func__, smp_processor_id(), ch, ch->id); 2020 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2021 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2022 2023 grp->outstanding_xid7--; 2024 ch->xid_skb->data = ch->xid_skb_data; 2025 skb_reset_tail_pointer(ch->xid_skb); 2026 ch->xid_skb->len = 0; 2027 2028 switch (fsm_getstate(grp->fsm)) { 2029 case MPCG_STATE_XID7INITI: 2030 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2031 mpc_validate_xid(mpcginfo); 2032 break; 2033 case MPCG_STATE_XID7INITW: 2034 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2035 mpc_validate_xid(mpcginfo); 2036 break; 2037 case MPCG_STATE_XID7INITZ: 2038 case MPCG_STATE_XID7INITX: 2039 if (grp->outstanding_xid7 == 0) { 2040 if (grp->outstanding_xid7_p2 > 0) { 2041 grp->outstanding_xid7 = 2042 grp->outstanding_xid7_p2; 2043 grp->outstanding_xid7_p2 = 0; 2044 } else 2045 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2046 2047 mpc_validate_xid(mpcginfo); 2048 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2049 break; 2050 } 2051 mpc_validate_xid(mpcginfo); 2052 break; 2053 } 2054 kfree(mpcginfo); 2055 return; 2056 } 2057 2058 /* 2059 * mpc_action helper of an MPC Group Station FSM action 2060 * CTCM_PROTO_MPC only 2061 */ 2062 static int mpc_send_qllc_discontact(struct net_device *dev) 2063 { 2064 __u32 new_len = 0; 2065 struct sk_buff *skb; 2066 struct qllc *qllcptr; 2067 struct ctcm_priv *priv = dev->ml_priv; 2068 struct mpc_group *grp = priv->mpcg; 2069 2070 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2071 __func__, mpcg_state_names[grp->saved_state]); 2072 2073 switch (grp->saved_state) { 2074 /* 2075 * establish conn callback function is 2076 * preferred method to report failure 2077 */ 2078 case MPCG_STATE_XID0IOWAIT: 2079 case MPCG_STATE_XID0IOWAIX: 2080 case MPCG_STATE_XID7INITI: 2081 case MPCG_STATE_XID7INITZ: 2082 case MPCG_STATE_XID2INITW: 2083 case MPCG_STATE_XID2INITX: 2084 case MPCG_STATE_XID7INITW: 2085 case MPCG_STATE_XID7INITX: 2086 if (grp->estconnfunc) { 2087 grp->estconnfunc(grp->port_num, -1, 0); 2088 grp->estconnfunc = NULL; 2089 break; 2090 } 2091 case MPCG_STATE_FLOWC: 2092 case MPCG_STATE_READY: 2093 grp->send_qllc_disc = 2; 2094 new_len = sizeof(struct qllc); 2095 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2096 if (qllcptr == NULL) { 2097 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2098 "%s(%s): qllcptr allocation error", 2099 CTCM_FUNTAIL, dev->name); 2100 return -ENOMEM; 2101 } 2102 2103 qllcptr->qllc_address = 0xcc; 2104 qllcptr->qllc_commands = 0x03; 2105 2106 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2107 2108 if (skb == NULL) { 2109 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2110 "%s(%s): skb allocation error", 2111 CTCM_FUNTAIL, dev->name); 2112 priv->stats.rx_dropped++; 2113 kfree(qllcptr); 2114 return -ENOMEM; 2115 } 2116 2117 skb_put_data(skb, qllcptr, new_len); 2118 kfree(qllcptr); 2119 2120 if (skb_headroom(skb) < 4) { 2121 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2122 "%s(%s): skb_headroom error", 2123 CTCM_FUNTAIL, dev->name); 2124 dev_kfree_skb_any(skb); 2125 return -ENOMEM; 2126 } 2127 2128 *((__u32 *)skb_push(skb, 4)) = 2129 priv->channel[CTCM_READ]->pdu_seq; 2130 priv->channel[CTCM_READ]->pdu_seq++; 2131 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2132 __func__, priv->channel[CTCM_READ]->pdu_seq); 2133 2134 /* receipt of CC03 resets anticipated sequence number on 2135 receiving side */ 2136 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2137 skb_reset_mac_header(skb); 2138 skb->dev = dev; 2139 skb->protocol = htons(ETH_P_SNAP); 2140 skb->ip_summed = CHECKSUM_UNNECESSARY; 2141 2142 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2143 2144 netif_rx(skb); 2145 break; 2146 default: 2147 break; 2148 2149 } 2150 2151 return 0; 2152 } 2153 /* --- This is the END my friend --- */ 2154 2155