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 #ifdef CONFIG_64BIT 134 char addr[22]; 135 #else 136 char addr[12]; 137 #endif 138 char boff[12]; 139 char bhex[82], duphex[82]; 140 char basc[40]; 141 142 sw = 0; 143 rptr = ptr = buf; 144 rm = 16; 145 duphex[0] = 0x00; 146 dup = 0; 147 148 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 149 if (sw == 0) { 150 #ifdef CONFIG_64BIT 151 sprintf(addr, "%16.16llx", (__u64)rptr); 152 #else 153 sprintf(addr, "%8.8X", (__u32)rptr); 154 #endif 155 156 sprintf(boff, "%4.4X", (__u32)ct); 157 bhex[0] = '\0'; 158 basc[0] = '\0'; 159 } 160 if ((sw == 4) || (sw == 12)) 161 strcat(bhex, " "); 162 if (sw == 8) 163 strcat(bhex, " "); 164 165 #if CONFIG_64BIT 166 sprintf(tbuf, "%2.2llX", (__u64)*ptr); 167 #else 168 sprintf(tbuf, "%2.2X", (__u32)*ptr); 169 #endif 170 171 tbuf[2] = '\0'; 172 strcat(bhex, tbuf); 173 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 174 basc[sw] = *ptr; 175 else 176 basc[sw] = '.'; 177 178 basc[sw+1] = '\0'; 179 sw++; 180 rm--; 181 if (sw != 16) 182 continue; 183 if ((strcmp(duphex, bhex)) != 0) { 184 if (dup != 0) { 185 sprintf(tdup, 186 "Duplicate as above to %s", addr); 187 ctcm_pr_debug(" --- %s ---\n", 188 tdup); 189 } 190 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 191 addr, boff, bhex, basc); 192 dup = 0; 193 strcpy(duphex, bhex); 194 } else 195 dup++; 196 197 sw = 0; 198 rm = 16; 199 } /* endfor */ 200 201 if (sw != 0) { 202 for ( ; rm > 0; rm--, sw++) { 203 if ((sw == 4) || (sw == 12)) 204 strcat(bhex, " "); 205 if (sw == 8) 206 strcat(bhex, " "); 207 strcat(bhex, " "); 208 strcat(basc, " "); 209 } 210 if (dup != 0) { 211 sprintf(tdup, "Duplicate as above to %s", addr); 212 ctcm_pr_debug(" --- %s ---\n", tdup); 213 } 214 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 215 addr, boff, bhex, basc); 216 } else { 217 if (dup >= 1) { 218 sprintf(tdup, "Duplicate as above to %s", addr); 219 ctcm_pr_debug(" --- %s ---\n", tdup); 220 } 221 if (dup != 0) { 222 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 223 addr, boff, bhex, basc); 224 } 225 } 226 227 return; 228 229 } /* end of ctcmpc_dumpit */ 230 #endif 231 232 #ifdef DEBUGDATA 233 /* 234 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 235 * 236 * skb The sk_buff to dump. 237 * offset Offset relative to skb-data, where to start the dump. 238 */ 239 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 240 { 241 __u8 *p = skb->data; 242 struct th_header *header; 243 struct pdu *pheader; 244 int bl = skb->len; 245 int i; 246 247 if (p == NULL) 248 return; 249 250 p += offset; 251 header = (struct th_header *)p; 252 253 ctcm_pr_debug("dump:\n"); 254 ctcm_pr_debug("skb len=%d \n", skb->len); 255 if (skb->len > 2) { 256 switch (header->th_ch_flag) { 257 case TH_HAS_PDU: 258 break; 259 case 0x00: 260 case TH_IS_XID: 261 if ((header->th_blk_flag == TH_DATA_IS_XID) && 262 (header->th_is_xid == 0x01)) 263 goto dumpth; 264 case TH_SWEEP_REQ: 265 goto dumpth; 266 case TH_SWEEP_RESP: 267 goto dumpth; 268 default: 269 break; 270 } 271 272 pheader = (struct pdu *)p; 273 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 274 pheader->pdu_offset, pheader->pdu_offset); 275 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 276 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 277 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 278 goto dumpdata; 279 280 dumpth: 281 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 282 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 283 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 284 ctcm_pr_debug("th->type : %s\n", 285 (header->th_is_xid) ? "DATA" : "XID"); 286 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 287 288 } 289 dumpdata: 290 if (bl > 32) 291 bl = 32; 292 ctcm_pr_debug("data: "); 293 for (i = 0; i < bl; i++) 294 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 295 ctcm_pr_debug("\n"); 296 } 297 #endif 298 299 static struct net_device *ctcmpc_get_dev(int port_num) 300 { 301 char device[20]; 302 struct net_device *dev; 303 struct ctcm_priv *priv; 304 305 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 306 307 dev = __dev_get_by_name(&init_net, device); 308 309 if (dev == NULL) { 310 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 311 "%s: Device not found by name: %s", 312 CTCM_FUNTAIL, device); 313 return NULL; 314 } 315 priv = dev->ml_priv; 316 if (priv == NULL) { 317 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 318 "%s(%s): dev->ml_priv is NULL", 319 CTCM_FUNTAIL, device); 320 return NULL; 321 } 322 if (priv->mpcg == NULL) { 323 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 324 "%s(%s): priv->mpcg is NULL", 325 CTCM_FUNTAIL, device); 326 return NULL; 327 } 328 return dev; 329 } 330 331 /* 332 * ctc_mpc_alloc_channel 333 * (exported interface) 334 * 335 * Device Initialization : 336 * ACTPATH driven IO operations 337 */ 338 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 339 { 340 struct net_device *dev; 341 struct mpc_group *grp; 342 struct ctcm_priv *priv; 343 344 dev = ctcmpc_get_dev(port_num); 345 if (dev == NULL) 346 return 1; 347 priv = dev->ml_priv; 348 grp = priv->mpcg; 349 350 grp->allochanfunc = callback; 351 grp->port_num = port_num; 352 grp->port_persist = 1; 353 354 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 355 "%s(%s): state=%s", 356 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 357 358 switch (fsm_getstate(grp->fsm)) { 359 case MPCG_STATE_INOP: 360 /* Group is in the process of terminating */ 361 grp->alloc_called = 1; 362 break; 363 case MPCG_STATE_RESET: 364 /* MPC Group will transition to state */ 365 /* MPCG_STATE_XID2INITW iff the minimum number */ 366 /* of 1 read and 1 write channel have successfully*/ 367 /* activated */ 368 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 369 if (callback) 370 grp->send_qllc_disc = 1; 371 case MPCG_STATE_XID0IOWAIT: 372 fsm_deltimer(&grp->timer); 373 grp->outstanding_xid2 = 0; 374 grp->outstanding_xid7 = 0; 375 grp->outstanding_xid7_p2 = 0; 376 grp->saved_xid2 = NULL; 377 if (callback) 378 ctcm_open(dev); 379 fsm_event(priv->fsm, DEV_EVENT_START, dev); 380 break; 381 case MPCG_STATE_READY: 382 /* XID exchanges completed after PORT was activated */ 383 /* Link station already active */ 384 /* Maybe timing issue...retry callback */ 385 grp->allocchan_callback_retries++; 386 if (grp->allocchan_callback_retries < 4) { 387 if (grp->allochanfunc) 388 grp->allochanfunc(grp->port_num, 389 grp->group_max_buflen); 390 } else { 391 /* there are problems...bail out */ 392 /* there may be a state mismatch so restart */ 393 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 394 grp->allocchan_callback_retries = 0; 395 } 396 break; 397 } 398 399 return 0; 400 } 401 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 402 403 /* 404 * ctc_mpc_establish_connectivity 405 * (exported interface) 406 */ 407 void ctc_mpc_establish_connectivity(int port_num, 408 void (*callback)(int, int, int)) 409 { 410 struct net_device *dev; 411 struct mpc_group *grp; 412 struct ctcm_priv *priv; 413 struct channel *rch, *wch; 414 415 dev = ctcmpc_get_dev(port_num); 416 if (dev == NULL) 417 return; 418 priv = dev->ml_priv; 419 grp = priv->mpcg; 420 rch = priv->channel[CTCM_READ]; 421 wch = priv->channel[CTCM_WRITE]; 422 423 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 424 "%s(%s): state=%s", 425 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 426 427 grp->estconnfunc = callback; 428 grp->port_num = port_num; 429 430 switch (fsm_getstate(grp->fsm)) { 431 case MPCG_STATE_READY: 432 /* XID exchanges completed after PORT was activated */ 433 /* Link station already active */ 434 /* Maybe timing issue...retry callback */ 435 fsm_deltimer(&grp->timer); 436 grp->estconn_callback_retries++; 437 if (grp->estconn_callback_retries < 4) { 438 if (grp->estconnfunc) { 439 grp->estconnfunc(grp->port_num, 0, 440 grp->group_max_buflen); 441 grp->estconnfunc = NULL; 442 } 443 } else { 444 /* there are problems...bail out */ 445 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 446 grp->estconn_callback_retries = 0; 447 } 448 break; 449 case MPCG_STATE_INOP: 450 case MPCG_STATE_RESET: 451 /* MPC Group is not ready to start XID - min num of */ 452 /* 1 read and 1 write channel have not been acquired*/ 453 454 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 455 "%s(%s): REJECTED - inactive channels", 456 CTCM_FUNTAIL, dev->name); 457 if (grp->estconnfunc) { 458 grp->estconnfunc(grp->port_num, -1, 0); 459 grp->estconnfunc = NULL; 460 } 461 break; 462 case MPCG_STATE_XID2INITW: 463 /* alloc channel was called but no XID exchange */ 464 /* has occurred. initiate xside XID exchange */ 465 /* make sure yside XID0 processing has not started */ 466 467 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 468 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 469 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 470 "%s(%s): ABORT - PASSIVE XID", 471 CTCM_FUNTAIL, dev->name); 472 break; 473 } 474 grp->send_qllc_disc = 1; 475 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 476 fsm_deltimer(&grp->timer); 477 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 478 MPCG_EVENT_TIMER, dev); 479 grp->outstanding_xid7 = 0; 480 grp->outstanding_xid7_p2 = 0; 481 grp->saved_xid2 = NULL; 482 if ((rch->in_mpcgroup) && 483 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 484 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 485 else { 486 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 487 "%s(%s): RX-%s not ready for ACTIVE XID0", 488 CTCM_FUNTAIL, dev->name, rch->id); 489 if (grp->estconnfunc) { 490 grp->estconnfunc(grp->port_num, -1, 0); 491 grp->estconnfunc = NULL; 492 } 493 fsm_deltimer(&grp->timer); 494 goto done; 495 } 496 if ((wch->in_mpcgroup) && 497 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 498 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 499 else { 500 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 501 "%s(%s): WX-%s not ready for ACTIVE XID0", 502 CTCM_FUNTAIL, dev->name, wch->id); 503 if (grp->estconnfunc) { 504 grp->estconnfunc(grp->port_num, -1, 0); 505 grp->estconnfunc = NULL; 506 } 507 fsm_deltimer(&grp->timer); 508 goto done; 509 } 510 break; 511 case MPCG_STATE_XID0IOWAIT: 512 /* already in active XID negotiations */ 513 default: 514 break; 515 } 516 517 done: 518 CTCM_PR_DEBUG("Exit %s()\n", __func__); 519 return; 520 } 521 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 522 523 /* 524 * ctc_mpc_dealloc_ch 525 * (exported interface) 526 */ 527 void ctc_mpc_dealloc_ch(int port_num) 528 { 529 struct net_device *dev; 530 struct ctcm_priv *priv; 531 struct mpc_group *grp; 532 533 dev = ctcmpc_get_dev(port_num); 534 if (dev == NULL) 535 return; 536 priv = dev->ml_priv; 537 grp = priv->mpcg; 538 539 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 540 "%s: %s: refcount = %d\n", 541 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 542 543 fsm_deltimer(&priv->restart_timer); 544 grp->channels_terminating = 0; 545 fsm_deltimer(&grp->timer); 546 grp->allochanfunc = NULL; 547 grp->estconnfunc = NULL; 548 grp->port_persist = 0; 549 grp->send_qllc_disc = 0; 550 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 551 552 ctcm_close(dev); 553 return; 554 } 555 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 556 557 /* 558 * ctc_mpc_flow_control 559 * (exported interface) 560 */ 561 void ctc_mpc_flow_control(int port_num, int flowc) 562 { 563 struct ctcm_priv *priv; 564 struct mpc_group *grp; 565 struct net_device *dev; 566 struct channel *rch; 567 int mpcg_state; 568 569 dev = ctcmpc_get_dev(port_num); 570 if (dev == NULL) 571 return; 572 priv = dev->ml_priv; 573 grp = priv->mpcg; 574 575 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 576 "%s: %s: flowc = %d", 577 CTCM_FUNTAIL, dev->name, flowc); 578 579 rch = priv->channel[CTCM_READ]; 580 581 mpcg_state = fsm_getstate(grp->fsm); 582 switch (flowc) { 583 case 1: 584 if (mpcg_state == MPCG_STATE_FLOWC) 585 break; 586 if (mpcg_state == MPCG_STATE_READY) { 587 if (grp->flow_off_called == 1) 588 grp->flow_off_called = 0; 589 else 590 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 591 break; 592 } 593 break; 594 case 0: 595 if (mpcg_state == MPCG_STATE_FLOWC) { 596 fsm_newstate(grp->fsm, MPCG_STATE_READY); 597 /* ensure any data that has accumulated */ 598 /* on the io_queue will now be sen t */ 599 tasklet_schedule(&rch->ch_tasklet); 600 } 601 /* possible race condition */ 602 if (mpcg_state == MPCG_STATE_READY) { 603 grp->flow_off_called = 1; 604 break; 605 } 606 break; 607 } 608 609 } 610 EXPORT_SYMBOL(ctc_mpc_flow_control); 611 612 static int mpc_send_qllc_discontact(struct net_device *); 613 614 /* 615 * helper function of ctcmpc_unpack_skb 616 */ 617 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 618 { 619 struct channel *rch = mpcginfo->ch; 620 struct net_device *dev = rch->netdev; 621 struct ctcm_priv *priv = dev->ml_priv; 622 struct mpc_group *grp = priv->mpcg; 623 struct channel *ch = priv->channel[CTCM_WRITE]; 624 625 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 626 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 627 628 grp->sweep_rsp_pend_num--; 629 630 if ((grp->sweep_req_pend_num == 0) && 631 (grp->sweep_rsp_pend_num == 0)) { 632 fsm_deltimer(&ch->sweep_timer); 633 grp->in_sweep = 0; 634 rch->th_seq_num = 0x00; 635 ch->th_seq_num = 0x00; 636 ctcm_clear_busy_do(dev); 637 } 638 639 kfree(mpcginfo); 640 641 return; 642 643 } 644 645 /* 646 * helper function of mpc_rcvd_sweep_req 647 * which is a helper of ctcmpc_unpack_skb 648 */ 649 static void ctcmpc_send_sweep_resp(struct channel *rch) 650 { 651 struct net_device *dev = rch->netdev; 652 struct ctcm_priv *priv = dev->ml_priv; 653 struct mpc_group *grp = priv->mpcg; 654 struct th_sweep *header; 655 struct sk_buff *sweep_skb; 656 struct channel *ch = priv->channel[CTCM_WRITE]; 657 658 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 659 660 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 661 if (sweep_skb == NULL) { 662 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 663 "%s(%s): sweep_skb allocation ERROR\n", 664 CTCM_FUNTAIL, rch->id); 665 goto done; 666 } 667 668 header = kmalloc(sizeof(struct th_sweep), gfp_type()); 669 670 if (!header) { 671 dev_kfree_skb_any(sweep_skb); 672 goto done; 673 } 674 675 header->th.th_seg = 0x00 ; 676 header->th.th_ch_flag = TH_SWEEP_RESP; 677 header->th.th_blk_flag = 0x00; 678 header->th.th_is_xid = 0x00; 679 header->th.th_seq_num = 0x00; 680 header->sw.th_last_seq = ch->th_seq_num; 681 682 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 683 684 kfree(header); 685 686 dev->trans_start = jiffies; 687 skb_queue_tail(&ch->sweep_queue, sweep_skb); 688 689 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 690 691 return; 692 693 done: 694 grp->in_sweep = 0; 695 ctcm_clear_busy_do(dev); 696 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 697 698 return; 699 } 700 701 /* 702 * helper function of ctcmpc_unpack_skb 703 */ 704 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 705 { 706 struct channel *rch = mpcginfo->ch; 707 struct net_device *dev = rch->netdev; 708 struct ctcm_priv *priv = dev->ml_priv; 709 struct mpc_group *grp = priv->mpcg; 710 struct channel *ch = priv->channel[CTCM_WRITE]; 711 712 if (do_debug) 713 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 714 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 715 716 if (grp->in_sweep == 0) { 717 grp->in_sweep = 1; 718 ctcm_test_and_set_busy(dev); 719 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 720 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 721 } 722 723 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 724 725 grp->sweep_req_pend_num--; 726 ctcmpc_send_sweep_resp(ch); 727 kfree(mpcginfo); 728 return; 729 } 730 731 /* 732 * MPC Group Station FSM definitions 733 */ 734 static const char *mpcg_event_names[] = { 735 [MPCG_EVENT_INOP] = "INOP Condition", 736 [MPCG_EVENT_DISCONC] = "Discontact Received", 737 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 738 [MPCG_EVENT_XID2] = "XID2 Received", 739 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 740 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 741 [MPCG_EVENT_TIMER] = "XID Setup Timer", 742 [MPCG_EVENT_DOIO] = "XID DoIO", 743 }; 744 745 static const char *mpcg_state_names[] = { 746 [MPCG_STATE_RESET] = "Reset", 747 [MPCG_STATE_INOP] = "INOP", 748 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 749 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 750 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 751 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 752 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 753 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 754 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 755 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 756 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 757 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 758 [MPCG_STATE_READY] = "READY", 759 }; 760 761 /* 762 * The MPC Group Station FSM 763 * 22 events 764 */ 765 static const fsm_node mpcg_fsm[] = { 766 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 767 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 768 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 769 770 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 771 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 772 773 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 774 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 775 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 776 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 777 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 778 779 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 780 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 781 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 782 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 783 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 784 785 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 786 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 787 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 788 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 789 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 790 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 791 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 792 793 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 794 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 795 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 796 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 797 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 798 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 799 800 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 801 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 802 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 803 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 804 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 805 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 806 807 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 808 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 809 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 810 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 811 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 812 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 813 814 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 815 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 816 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 817 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 818 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 819 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 820 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 821 822 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 823 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 824 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 825 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 826 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 827 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 828 829 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 830 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 831 }; 832 833 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 834 835 /* 836 * MPC Group Station FSM action 837 * CTCM_PROTO_MPC only 838 */ 839 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 840 { 841 struct net_device *dev = arg; 842 struct ctcm_priv *priv = dev->ml_priv; 843 struct mpc_group *grp = priv->mpcg; 844 845 if (grp == NULL) { 846 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 847 "%s(%s): No MPC group", 848 CTCM_FUNTAIL, dev->name); 849 return; 850 } 851 852 fsm_deltimer(&grp->timer); 853 854 if (grp->saved_xid2->xid2_flag2 == 0x40) { 855 priv->xid->xid2_flag2 = 0x00; 856 if (grp->estconnfunc) { 857 grp->estconnfunc(grp->port_num, 1, 858 grp->group_max_buflen); 859 grp->estconnfunc = NULL; 860 } else if (grp->allochanfunc) 861 grp->send_qllc_disc = 1; 862 863 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 864 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 865 "%s(%s): fails", 866 CTCM_FUNTAIL, dev->name); 867 return; 868 } 869 870 grp->port_persist = 1; 871 grp->out_of_sequence = 0; 872 grp->estconn_called = 0; 873 874 tasklet_hi_schedule(&grp->mpc_tasklet2); 875 876 return; 877 } 878 879 /* 880 * helper of ctcm_init_netdevice 881 * CTCM_PROTO_MPC only 882 */ 883 void mpc_group_ready(unsigned long adev) 884 { 885 struct net_device *dev = (struct net_device *)adev; 886 struct ctcm_priv *priv = dev->ml_priv; 887 struct mpc_group *grp = priv->mpcg; 888 struct channel *ch = NULL; 889 890 if (grp == NULL) { 891 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 892 "%s(%s): No MPC group", 893 CTCM_FUNTAIL, dev->name); 894 return; 895 } 896 897 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 898 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 899 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 900 901 fsm_newstate(grp->fsm, MPCG_STATE_READY); 902 903 /* Put up a read on the channel */ 904 ch = priv->channel[CTCM_READ]; 905 ch->pdu_seq = 0; 906 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 907 __func__, ch->pdu_seq); 908 909 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 910 /* Put the write channel in idle state */ 911 ch = priv->channel[CTCM_WRITE]; 912 if (ch->collect_len > 0) { 913 spin_lock(&ch->collect_lock); 914 ctcm_purge_skb_queue(&ch->collect_queue); 915 ch->collect_len = 0; 916 spin_unlock(&ch->collect_lock); 917 } 918 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 919 ctcm_clear_busy(dev); 920 921 if (grp->estconnfunc) { 922 grp->estconnfunc(grp->port_num, 0, 923 grp->group_max_buflen); 924 grp->estconnfunc = NULL; 925 } else if (grp->allochanfunc) 926 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 927 928 grp->send_qllc_disc = 1; 929 grp->changed_side = 0; 930 931 return; 932 933 } 934 935 /* 936 * Increment the MPC Group Active Channel Counts 937 * helper of dev_action (called from channel fsm) 938 */ 939 void mpc_channel_action(struct channel *ch, int direction, int action) 940 { 941 struct net_device *dev = ch->netdev; 942 struct ctcm_priv *priv = dev->ml_priv; 943 struct mpc_group *grp = priv->mpcg; 944 945 if (grp == NULL) { 946 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 947 "%s(%s): No MPC group", 948 CTCM_FUNTAIL, dev->name); 949 return; 950 } 951 952 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 953 954 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 955 "%s: %i / Grp:%s total_channels=%i, active_channels: " 956 "read=%i, write=%i\n", __func__, action, 957 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 958 grp->active_channels[CTCM_READ], 959 grp->active_channels[CTCM_WRITE]); 960 961 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 962 grp->num_channel_paths++; 963 grp->active_channels[direction]++; 964 grp->outstanding_xid2++; 965 ch->in_mpcgroup = 1; 966 967 if (ch->xid_skb != NULL) 968 dev_kfree_skb_any(ch->xid_skb); 969 970 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 971 GFP_ATOMIC | GFP_DMA); 972 if (ch->xid_skb == NULL) { 973 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 974 "%s(%s): Couldn't alloc ch xid_skb\n", 975 CTCM_FUNTAIL, dev->name); 976 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 977 return; 978 } 979 ch->xid_skb_data = ch->xid_skb->data; 980 ch->xid_th = (struct th_header *)ch->xid_skb->data; 981 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 982 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 983 skb_put(ch->xid_skb, XID2_LENGTH); 984 ch->xid_id = skb_tail_pointer(ch->xid_skb); 985 ch->xid_skb->data = ch->xid_skb_data; 986 skb_reset_tail_pointer(ch->xid_skb); 987 ch->xid_skb->len = 0; 988 989 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len), 990 grp->xid_skb->data, 991 grp->xid_skb->len); 992 993 ch->xid->xid2_dlc_type = 994 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 995 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 996 997 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 998 ch->xid->xid2_buf_len = 0x00; 999 1000 ch->xid_skb->data = ch->xid_skb_data; 1001 skb_reset_tail_pointer(ch->xid_skb); 1002 ch->xid_skb->len = 0; 1003 1004 fsm_newstate(ch->fsm, CH_XID0_PENDING); 1005 1006 if ((grp->active_channels[CTCM_READ] > 0) && 1007 (grp->active_channels[CTCM_WRITE] > 0) && 1008 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 1009 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1010 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 1011 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1012 __func__, dev->name); 1013 } 1014 } else if ((action == MPC_CHANNEL_REMOVE) && 1015 (ch->in_mpcgroup == 1)) { 1016 ch->in_mpcgroup = 0; 1017 grp->num_channel_paths--; 1018 grp->active_channels[direction]--; 1019 1020 if (ch->xid_skb != NULL) 1021 dev_kfree_skb_any(ch->xid_skb); 1022 ch->xid_skb = NULL; 1023 1024 if (grp->channels_terminating) 1025 goto done; 1026 1027 if (((grp->active_channels[CTCM_READ] == 0) && 1028 (grp->active_channels[CTCM_WRITE] > 0)) 1029 || ((grp->active_channels[CTCM_WRITE] == 0) && 1030 (grp->active_channels[CTCM_READ] > 0))) 1031 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1032 } 1033 done: 1034 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1035 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1036 "read=%i, write=%i\n", __func__, action, 1037 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1038 grp->active_channels[CTCM_READ], 1039 grp->active_channels[CTCM_WRITE]); 1040 1041 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1042 } 1043 1044 /** 1045 * Unpack a just received skb and hand it over to 1046 * upper layers. 1047 * special MPC version of unpack_skb. 1048 * 1049 * ch The channel where this skb has been received. 1050 * pskb The received skb. 1051 */ 1052 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1053 { 1054 struct net_device *dev = ch->netdev; 1055 struct ctcm_priv *priv = dev->ml_priv; 1056 struct mpc_group *grp = priv->mpcg; 1057 struct pdu *curr_pdu; 1058 struct mpcg_info *mpcginfo; 1059 struct th_header *header = NULL; 1060 struct th_sweep *sweep = NULL; 1061 int pdu_last_seen = 0; 1062 __u32 new_len; 1063 struct sk_buff *skb; 1064 int skblen; 1065 int sendrc = 0; 1066 1067 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1068 __func__, dev->name, smp_processor_id(), ch->id); 1069 1070 header = (struct th_header *)pskb->data; 1071 if ((header->th_seg == 0) && 1072 (header->th_ch_flag == 0) && 1073 (header->th_blk_flag == 0) && 1074 (header->th_seq_num == 0)) 1075 /* nothing for us */ goto done; 1076 1077 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1078 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1079 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1080 1081 pskb->dev = dev; 1082 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1083 skb_pull(pskb, TH_HEADER_LENGTH); 1084 1085 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1086 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1087 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1088 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1089 (header->th_seq_num != ch->th_seq_num + 1) && 1090 (ch->th_seq_num != 0))) { 1091 /* This is NOT the next segment * 1092 * we are not the correct race winner * 1093 * go away and let someone else win * 1094 * BUT..this only applies if xid negot * 1095 * is done * 1096 */ 1097 grp->out_of_sequence += 1; 1098 __skb_push(pskb, TH_HEADER_LENGTH); 1099 skb_queue_tail(&ch->io_queue, pskb); 1100 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1101 "got:%08x\n", __func__, 1102 ch->th_seq_num + 1, header->th_seq_num); 1103 1104 return; 1105 } 1106 grp->out_of_sequence = 0; 1107 ch->th_seq_num = header->th_seq_num; 1108 1109 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1110 __func__, ch->th_seq_num); 1111 1112 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1113 goto done; 1114 while ((pskb->len > 0) && !pdu_last_seen) { 1115 curr_pdu = (struct pdu *)pskb->data; 1116 1117 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1118 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1119 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1120 __func__, pskb->len); 1121 1122 skb_pull(pskb, PDU_HEADER_LENGTH); 1123 1124 if (curr_pdu->pdu_flag & PDU_LAST) 1125 pdu_last_seen = 1; 1126 if (curr_pdu->pdu_flag & PDU_CNTL) 1127 pskb->protocol = htons(ETH_P_SNAP); 1128 else 1129 pskb->protocol = htons(ETH_P_SNA_DIX); 1130 1131 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1132 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1133 "%s(%s): Dropping packet with " 1134 "illegal siize %d", 1135 CTCM_FUNTAIL, dev->name, pskb->len); 1136 1137 priv->stats.rx_dropped++; 1138 priv->stats.rx_length_errors++; 1139 goto done; 1140 } 1141 skb_reset_mac_header(pskb); 1142 new_len = curr_pdu->pdu_offset; 1143 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1144 __func__, new_len); 1145 if ((new_len == 0) || (new_len > pskb->len)) { 1146 /* should never happen */ 1147 /* pskb len must be hosed...bail out */ 1148 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1149 "%s(%s): non valid pdu_offset: %04x", 1150 /* "data may be lost", */ 1151 CTCM_FUNTAIL, dev->name, new_len); 1152 goto done; 1153 } 1154 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1155 1156 if (!skb) { 1157 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1158 "%s(%s): MEMORY allocation error", 1159 CTCM_FUNTAIL, dev->name); 1160 priv->stats.rx_dropped++; 1161 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1162 goto done; 1163 } 1164 memcpy(skb_put(skb, new_len), pskb->data, new_len); 1165 1166 skb_reset_mac_header(skb); 1167 skb->dev = pskb->dev; 1168 skb->protocol = pskb->protocol; 1169 skb->ip_summed = CHECKSUM_UNNECESSARY; 1170 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1171 ch->pdu_seq++; 1172 1173 if (do_debug_data) { 1174 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1175 __func__, ch->pdu_seq); 1176 ctcm_pr_debug("%s: skb:%0lx " 1177 "skb len: %d \n", __func__, 1178 (unsigned long)skb, skb->len); 1179 ctcm_pr_debug("%s: up to 32 bytes " 1180 "of pdu_data sent\n", __func__); 1181 ctcmpc_dump32((char *)skb->data, skb->len); 1182 } 1183 1184 skblen = skb->len; 1185 sendrc = netif_rx(skb); 1186 priv->stats.rx_packets++; 1187 priv->stats.rx_bytes += skblen; 1188 skb_pull(pskb, new_len); /* point to next PDU */ 1189 } 1190 } else { 1191 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1192 if (mpcginfo == NULL) 1193 goto done; 1194 1195 mpcginfo->ch = ch; 1196 mpcginfo->th = header; 1197 mpcginfo->skb = pskb; 1198 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1199 __func__); 1200 /* it's a sweep? */ 1201 sweep = (struct th_sweep *)pskb->data; 1202 mpcginfo->sweep = sweep; 1203 if (header->th_ch_flag == TH_SWEEP_REQ) 1204 mpc_rcvd_sweep_req(mpcginfo); 1205 else if (header->th_ch_flag == TH_SWEEP_RESP) 1206 mpc_rcvd_sweep_resp(mpcginfo); 1207 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1208 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1209 skb_pull(pskb, XID2_LENGTH); 1210 mpcginfo->xid = thisxid; 1211 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1212 } else if (header->th_blk_flag == TH_DISCONTACT) 1213 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1214 else if (header->th_seq_num != 0) { 1215 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1216 "%s(%s): control pkt expected\n", 1217 CTCM_FUNTAIL, dev->name); 1218 priv->stats.rx_dropped++; 1219 /* mpcginfo only used for non-data transfers */ 1220 kfree(mpcginfo); 1221 if (do_debug_data) 1222 ctcmpc_dump_skb(pskb, -8); 1223 } 1224 } 1225 done: 1226 1227 dev_kfree_skb_any(pskb); 1228 if (sendrc == NET_RX_DROP) { 1229 dev_warn(&dev->dev, 1230 "The network backlog for %s is exceeded, " 1231 "package dropped\n", __func__); 1232 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1233 } 1234 1235 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1236 __func__, dev->name, ch, ch->id); 1237 } 1238 1239 /** 1240 * tasklet helper for mpc's skb unpacking. 1241 * 1242 * ch The channel to work on. 1243 * Allow flow control back pressure to occur here. 1244 * Throttling back channel can result in excessive 1245 * channel inactivity and system deact of channel 1246 */ 1247 void ctcmpc_bh(unsigned long thischan) 1248 { 1249 struct channel *ch = (struct channel *)thischan; 1250 struct sk_buff *skb; 1251 struct net_device *dev = ch->netdev; 1252 struct ctcm_priv *priv = dev->ml_priv; 1253 struct mpc_group *grp = priv->mpcg; 1254 1255 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1256 dev->name, smp_processor_id(), __func__, ch->id); 1257 /* caller has requested driver to throttle back */ 1258 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1259 (skb = skb_dequeue(&ch->io_queue))) { 1260 ctcmpc_unpack_skb(ch, skb); 1261 if (grp->out_of_sequence > 20) { 1262 /* assume data loss has occurred if */ 1263 /* missing seq_num for extended */ 1264 /* period of time */ 1265 grp->out_of_sequence = 0; 1266 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1267 break; 1268 } 1269 if (skb == skb_peek(&ch->io_queue)) 1270 break; 1271 } 1272 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1273 __func__, dev->name, ch, ch->id); 1274 return; 1275 } 1276 1277 /* 1278 * MPC Group Initializations 1279 */ 1280 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1281 { 1282 struct mpc_group *grp; 1283 1284 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1285 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1286 1287 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1288 if (grp == NULL) 1289 return NULL; 1290 1291 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1292 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1293 mpcg_fsm_len, GFP_KERNEL); 1294 if (grp->fsm == NULL) { 1295 kfree(grp); 1296 return NULL; 1297 } 1298 1299 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1300 fsm_settimer(grp->fsm, &grp->timer); 1301 1302 grp->xid_skb = 1303 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1304 if (grp->xid_skb == NULL) { 1305 kfree_fsm(grp->fsm); 1306 kfree(grp); 1307 return NULL; 1308 } 1309 /* base xid for all channels in group */ 1310 grp->xid_skb_data = grp->xid_skb->data; 1311 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1312 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH), 1313 &thnorm, TH_HEADER_LENGTH); 1314 1315 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1316 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH); 1317 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1318 grp->xid->xid2_sender_id = jiffies; 1319 1320 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1321 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4); 1322 1323 grp->rcvd_xid_skb = 1324 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1325 if (grp->rcvd_xid_skb == NULL) { 1326 kfree_fsm(grp->fsm); 1327 dev_kfree_skb(grp->xid_skb); 1328 kfree(grp); 1329 return NULL; 1330 } 1331 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1332 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1333 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), 1334 &thnorm, TH_HEADER_LENGTH); 1335 grp->saved_xid2 = NULL; 1336 priv->xid = grp->xid; 1337 priv->mpcg = grp; 1338 return grp; 1339 } 1340 1341 /* 1342 * The MPC Group Station FSM 1343 */ 1344 1345 /* 1346 * MPC Group Station FSM actions 1347 * CTCM_PROTO_MPC only 1348 */ 1349 1350 /** 1351 * NOP action for statemachines 1352 */ 1353 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1354 { 1355 } 1356 1357 /* 1358 * invoked when the device transitions to dev_stopped 1359 * MPC will stop each individual channel if a single XID failure 1360 * occurs, or will intitiate all channels be stopped if a GROUP 1361 * level failure occurs. 1362 */ 1363 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1364 { 1365 struct net_device *dev = arg; 1366 struct ctcm_priv *priv; 1367 struct mpc_group *grp; 1368 struct channel *wch; 1369 1370 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1371 1372 priv = dev->ml_priv; 1373 grp = priv->mpcg; 1374 grp->flow_off_called = 0; 1375 fsm_deltimer(&grp->timer); 1376 if (grp->channels_terminating) 1377 return; 1378 1379 grp->channels_terminating = 1; 1380 grp->saved_state = fsm_getstate(grp->fsm); 1381 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1382 if (grp->saved_state > MPCG_STATE_XID7INITF) 1383 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1384 "%s(%s): MPC GROUP INOPERATIVE", 1385 CTCM_FUNTAIL, dev->name); 1386 if ((grp->saved_state != MPCG_STATE_RESET) || 1387 /* dealloc_channel has been called */ 1388 (grp->port_persist == 0)) 1389 fsm_deltimer(&priv->restart_timer); 1390 1391 wch = priv->channel[CTCM_WRITE]; 1392 1393 switch (grp->saved_state) { 1394 case MPCG_STATE_RESET: 1395 case MPCG_STATE_INOP: 1396 case MPCG_STATE_XID2INITW: 1397 case MPCG_STATE_XID0IOWAIT: 1398 case MPCG_STATE_XID2INITX: 1399 case MPCG_STATE_XID7INITW: 1400 case MPCG_STATE_XID7INITX: 1401 case MPCG_STATE_XID0IOWAIX: 1402 case MPCG_STATE_XID7INITI: 1403 case MPCG_STATE_XID7INITZ: 1404 case MPCG_STATE_XID7INITF: 1405 break; 1406 case MPCG_STATE_FLOWC: 1407 case MPCG_STATE_READY: 1408 default: 1409 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1410 } 1411 1412 grp->xid2_tgnum = 0; 1413 grp->group_max_buflen = 0; /*min of all received */ 1414 grp->outstanding_xid2 = 0; 1415 grp->outstanding_xid7 = 0; 1416 grp->outstanding_xid7_p2 = 0; 1417 grp->saved_xid2 = NULL; 1418 grp->xidnogood = 0; 1419 grp->changed_side = 0; 1420 1421 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1422 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1423 grp->rcvd_xid_skb->len = 0; 1424 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1425 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm, 1426 TH_HEADER_LENGTH); 1427 1428 if (grp->send_qllc_disc == 1) { 1429 grp->send_qllc_disc = 0; 1430 mpc_send_qllc_discontact(dev); 1431 } 1432 1433 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1434 /* This can result in INOP of VTAM PU due to halting of */ 1435 /* outstanding IO which causes a sense to be returned */ 1436 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1437 /* become unreachable without manual intervention */ 1438 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1439 grp->alloc_called = 0; 1440 fsm_deltimer(&priv->restart_timer); 1441 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1442 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1443 if (grp->saved_state > MPCG_STATE_XID7INITF) 1444 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1445 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1446 CTCM_FUNTAIL, dev->name); 1447 } else { 1448 fsm_deltimer(&priv->restart_timer); 1449 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1450 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1451 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1452 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1453 CTCM_FUNTAIL, dev->name); 1454 } 1455 } 1456 1457 /** 1458 * Handle mpc group action timeout. 1459 * MPC Group Station FSM action 1460 * CTCM_PROTO_MPC only 1461 * 1462 * fi An instance of an mpc_group fsm. 1463 * event The event, just happened. 1464 * arg Generic pointer, casted from net_device * upon call. 1465 */ 1466 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1467 { 1468 struct net_device *dev = arg; 1469 struct ctcm_priv *priv; 1470 struct mpc_group *grp; 1471 struct channel *wch; 1472 struct channel *rch; 1473 1474 priv = dev->ml_priv; 1475 grp = priv->mpcg; 1476 wch = priv->channel[CTCM_WRITE]; 1477 rch = priv->channel[CTCM_READ]; 1478 1479 switch (fsm_getstate(grp->fsm)) { 1480 case MPCG_STATE_XID2INITW: 1481 /* Unless there is outstanding IO on the */ 1482 /* channel just return and wait for ATTN */ 1483 /* interrupt to begin XID negotiations */ 1484 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1485 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1486 break; 1487 default: 1488 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1489 } 1490 1491 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1492 "%s: dev=%s exit", 1493 CTCM_FUNTAIL, dev->name); 1494 return; 1495 } 1496 1497 /* 1498 * MPC Group Station FSM action 1499 * CTCM_PROTO_MPC only 1500 */ 1501 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1502 { 1503 struct mpcg_info *mpcginfo = arg; 1504 struct channel *ch = mpcginfo->ch; 1505 struct net_device *dev; 1506 struct ctcm_priv *priv; 1507 struct mpc_group *grp; 1508 1509 if (ch) { 1510 dev = ch->netdev; 1511 if (dev) { 1512 priv = dev->ml_priv; 1513 if (priv) { 1514 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1515 "%s: %s: %s\n", 1516 CTCM_FUNTAIL, dev->name, ch->id); 1517 grp = priv->mpcg; 1518 grp->send_qllc_disc = 1; 1519 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1520 } 1521 } 1522 } 1523 1524 return; 1525 } 1526 1527 /* 1528 * MPC Group Station - not part of FSM 1529 * CTCM_PROTO_MPC only 1530 * called from add_channel in ctcm_main.c 1531 */ 1532 void mpc_action_send_discontact(unsigned long thischan) 1533 { 1534 int rc; 1535 struct channel *ch = (struct channel *)thischan; 1536 unsigned long saveflags = 0; 1537 1538 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1539 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1540 (unsigned long)ch, 0xff, 0); 1541 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1542 1543 if (rc != 0) { 1544 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1545 } 1546 1547 return; 1548 } 1549 1550 1551 /* 1552 * helper function of mpc FSM 1553 * CTCM_PROTO_MPC only 1554 * mpc_action_rcvd_xid7 1555 */ 1556 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1557 { 1558 struct channel *ch = mpcginfo->ch; 1559 struct net_device *dev = ch->netdev; 1560 struct ctcm_priv *priv = dev->ml_priv; 1561 struct mpc_group *grp = priv->mpcg; 1562 struct xid2 *xid = mpcginfo->xid; 1563 int rc = 0; 1564 __u64 our_id = 0; 1565 __u64 their_id = 0; 1566 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1567 1568 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1569 1570 if (xid == NULL) { 1571 rc = 1; 1572 /* XID REJECTED: xid == NULL */ 1573 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1574 "%s(%s): xid = NULL", 1575 CTCM_FUNTAIL, ch->id); 1576 goto done; 1577 } 1578 1579 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1580 1581 /*the received direction should be the opposite of ours */ 1582 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1583 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1584 rc = 2; 1585 /* XID REJECTED: r/w channel pairing mismatch */ 1586 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1587 "%s(%s): r/w channel pairing mismatch", 1588 CTCM_FUNTAIL, ch->id); 1589 goto done; 1590 } 1591 1592 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1593 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1594 grp->group_max_buflen, xid->xid2_buf_len); 1595 1596 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1597 xid->xid2_buf_len - len) 1598 grp->group_max_buflen = xid->xid2_buf_len - len; 1599 } 1600 1601 if (grp->saved_xid2 == NULL) { 1602 grp->saved_xid2 = 1603 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1604 1605 memcpy(skb_put(grp->rcvd_xid_skb, 1606 XID2_LENGTH), xid, XID2_LENGTH); 1607 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1608 1609 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1610 grp->rcvd_xid_skb->len = 0; 1611 1612 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1613 our_id = (__u64)priv->xid->xid2_adj_id; 1614 our_id = our_id << 32; 1615 our_id = our_id + priv->xid->xid2_sender_id; 1616 their_id = (__u64)xid->xid2_adj_id; 1617 their_id = their_id << 32; 1618 their_id = their_id + xid->xid2_sender_id; 1619 /* lower id assume the xside role */ 1620 if (our_id < their_id) { 1621 grp->roll = XSIDE; 1622 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1623 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1624 CTCM_FUNTAIL, ch->id); 1625 } else { 1626 grp->roll = YSIDE; 1627 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1628 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1629 CTCM_FUNTAIL, ch->id); 1630 } 1631 1632 } else { 1633 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1634 rc = 3; 1635 /* XID REJECTED: xid flag byte4 mismatch */ 1636 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1637 "%s(%s): xid flag byte4 mismatch", 1638 CTCM_FUNTAIL, ch->id); 1639 } 1640 if (xid->xid2_flag2 == 0x40) { 1641 rc = 4; 1642 /* XID REJECTED - xid NOGOOD */ 1643 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1644 "%s(%s): xid NOGOOD", 1645 CTCM_FUNTAIL, ch->id); 1646 } 1647 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1648 rc = 5; 1649 /* XID REJECTED - Adjacent Station ID Mismatch */ 1650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1651 "%s(%s): Adjacent Station ID Mismatch", 1652 CTCM_FUNTAIL, ch->id); 1653 } 1654 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1655 rc = 6; 1656 /* XID REJECTED - Sender Address Mismatch */ 1657 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1658 "%s(%s): Sender Address Mismatch", 1659 CTCM_FUNTAIL, ch->id); 1660 } 1661 } 1662 done: 1663 if (rc) { 1664 dev_warn(&dev->dev, 1665 "The XID used in the MPC protocol is not valid, " 1666 "rc = %d\n", rc); 1667 priv->xid->xid2_flag2 = 0x40; 1668 grp->saved_xid2->xid2_flag2 = 0x40; 1669 } 1670 1671 return rc; 1672 } 1673 1674 /* 1675 * MPC Group Station FSM action 1676 * CTCM_PROTO_MPC only 1677 */ 1678 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1679 { 1680 struct channel *ch = arg; 1681 int rc = 0; 1682 int gotlock = 0; 1683 unsigned long saveflags = 0; /* avoids compiler warning with 1684 spin_unlock_irqrestore */ 1685 1686 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1687 __func__, smp_processor_id(), ch, ch->id); 1688 1689 if (ctcm_checkalloc_buffer(ch)) 1690 goto done; 1691 1692 /* 1693 * skb data-buffer referencing: 1694 */ 1695 ch->trans_skb->data = ch->trans_skb_data; 1696 skb_reset_tail_pointer(ch->trans_skb); 1697 ch->trans_skb->len = 0; 1698 /* result of the previous 3 statements is NOT always 1699 * already set after ctcm_checkalloc_buffer 1700 * because of possible reuse of the trans_skb 1701 */ 1702 memset(ch->trans_skb->data, 0, 16); 1703 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1704 /* check is main purpose here: */ 1705 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1706 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1707 /* check is main purpose here: */ 1708 skb_put(ch->trans_skb, XID2_LENGTH); 1709 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1710 /* cleanup back to startpoint */ 1711 ch->trans_skb->data = ch->trans_skb_data; 1712 skb_reset_tail_pointer(ch->trans_skb); 1713 ch->trans_skb->len = 0; 1714 1715 /* non-checking rewrite of above skb data-buffer referencing: */ 1716 /* 1717 memset(ch->trans_skb->data, 0, 16); 1718 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1719 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1720 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1721 */ 1722 1723 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1724 ch->ccw[8].count = 0; 1725 ch->ccw[8].cda = 0x00; 1726 1727 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1728 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1729 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1730 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1731 1732 if (side == XSIDE) { 1733 /* mpc_action_xside_xid */ 1734 if (ch->xid_th == NULL) 1735 goto done; 1736 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1737 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1738 ch->ccw[9].count = TH_HEADER_LENGTH; 1739 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1740 1741 if (ch->xid == NULL) 1742 goto done; 1743 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1744 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1745 ch->ccw[10].count = XID2_LENGTH; 1746 ch->ccw[10].cda = virt_to_phys(ch->xid); 1747 1748 ch->ccw[11].cmd_code = CCW_CMD_READ; 1749 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1750 ch->ccw[11].count = TH_HEADER_LENGTH; 1751 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1752 1753 ch->ccw[12].cmd_code = CCW_CMD_READ; 1754 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1755 ch->ccw[12].count = XID2_LENGTH; 1756 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1757 1758 ch->ccw[13].cmd_code = CCW_CMD_READ; 1759 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1760 1761 } else { /* side == YSIDE : mpc_action_yside_xid */ 1762 ch->ccw[9].cmd_code = CCW_CMD_READ; 1763 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1764 ch->ccw[9].count = TH_HEADER_LENGTH; 1765 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1766 1767 ch->ccw[10].cmd_code = CCW_CMD_READ; 1768 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1769 ch->ccw[10].count = XID2_LENGTH; 1770 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1771 1772 if (ch->xid_th == NULL) 1773 goto done; 1774 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1775 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1776 ch->ccw[11].count = TH_HEADER_LENGTH; 1777 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1778 1779 if (ch->xid == NULL) 1780 goto done; 1781 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1782 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1783 ch->ccw[12].count = XID2_LENGTH; 1784 ch->ccw[12].cda = virt_to_phys(ch->xid); 1785 1786 if (ch->xid_id == NULL) 1787 goto done; 1788 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1789 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1790 1791 } 1792 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1793 ch->ccw[13].count = 4; 1794 1795 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1796 ch->ccw[14].flags = CCW_FLAG_SLI; 1797 ch->ccw[14].count = 0; 1798 ch->ccw[14].cda = 0; 1799 1800 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1801 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1802 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1803 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1804 1805 if (!in_irq()) { 1806 /* Such conditional locking is a known problem for 1807 * sparse because its static undeterministic. 1808 * Warnings should be ignored here. */ 1809 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1810 gotlock = 1; 1811 } 1812 1813 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1814 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1815 (unsigned long)ch, 0xff, 0); 1816 1817 if (gotlock) /* see remark above about conditional locking */ 1818 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1819 1820 if (rc != 0) { 1821 ctcm_ccw_check_rc(ch, rc, 1822 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1823 } 1824 1825 done: 1826 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1827 __func__, ch, ch->id); 1828 return; 1829 1830 } 1831 1832 /* 1833 * MPC Group Station FSM action 1834 * CTCM_PROTO_MPC only 1835 */ 1836 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1837 { 1838 mpc_action_side_xid(fsm, arg, XSIDE); 1839 } 1840 1841 /* 1842 * MPC Group Station FSM action 1843 * CTCM_PROTO_MPC only 1844 */ 1845 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1846 { 1847 mpc_action_side_xid(fsm, arg, YSIDE); 1848 } 1849 1850 /* 1851 * MPC Group Station FSM action 1852 * CTCM_PROTO_MPC only 1853 */ 1854 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1855 { 1856 struct channel *ch = arg; 1857 struct net_device *dev = ch->netdev; 1858 struct ctcm_priv *priv = dev->ml_priv; 1859 struct mpc_group *grp = priv->mpcg; 1860 1861 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1862 __func__, smp_processor_id(), ch, ch->id); 1863 1864 if (ch->xid == NULL) { 1865 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1866 "%s(%s): ch->xid == NULL", 1867 CTCM_FUNTAIL, dev->name); 1868 return; 1869 } 1870 1871 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1872 1873 ch->xid->xid2_option = XID2_0; 1874 1875 switch (fsm_getstate(grp->fsm)) { 1876 case MPCG_STATE_XID2INITW: 1877 case MPCG_STATE_XID2INITX: 1878 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1879 break; 1880 case MPCG_STATE_XID0IOWAIT: 1881 case MPCG_STATE_XID0IOWAIX: 1882 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1883 break; 1884 } 1885 1886 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1887 1888 return; 1889 } 1890 1891 /* 1892 * MPC Group Station FSM action 1893 * CTCM_PROTO_MPC only 1894 */ 1895 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1896 { 1897 struct net_device *dev = arg; 1898 struct ctcm_priv *priv = dev->ml_priv; 1899 struct mpc_group *grp = NULL; 1900 int direction; 1901 int send = 0; 1902 1903 if (priv) 1904 grp = priv->mpcg; 1905 if (grp == NULL) 1906 return; 1907 1908 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1909 struct channel *ch = priv->channel[direction]; 1910 struct xid2 *thisxid = ch->xid; 1911 ch->xid_skb->data = ch->xid_skb_data; 1912 skb_reset_tail_pointer(ch->xid_skb); 1913 ch->xid_skb->len = 0; 1914 thisxid->xid2_option = XID2_7; 1915 send = 0; 1916 1917 /* xid7 phase 1 */ 1918 if (grp->outstanding_xid7_p2 > 0) { 1919 if (grp->roll == YSIDE) { 1920 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1921 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1922 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1923 memcpy(skb_put(ch->xid_skb, 1924 TH_HEADER_LENGTH), 1925 &thdummy, TH_HEADER_LENGTH); 1926 send = 1; 1927 } 1928 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1929 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1930 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1931 memcpy(skb_put(ch->xid_skb, 1932 TH_HEADER_LENGTH), 1933 &thnorm, TH_HEADER_LENGTH); 1934 send = 1; 1935 } 1936 } else { 1937 /* xid7 phase 2 */ 1938 if (grp->roll == YSIDE) { 1939 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1940 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1941 memcpy(skb_put(ch->xid_skb, 1942 TH_HEADER_LENGTH), 1943 &thnorm, TH_HEADER_LENGTH); 1944 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1945 send = 1; 1946 } 1947 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1948 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1949 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1950 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH), 1951 &thdummy, TH_HEADER_LENGTH); 1952 send = 1; 1953 } 1954 } 1955 1956 if (send) 1957 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1958 } 1959 1960 return; 1961 } 1962 1963 /* 1964 * MPC Group Station FSM action 1965 * CTCM_PROTO_MPC only 1966 */ 1967 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1968 { 1969 1970 struct mpcg_info *mpcginfo = arg; 1971 struct channel *ch = mpcginfo->ch; 1972 struct net_device *dev = ch->netdev; 1973 struct ctcm_priv *priv = dev->ml_priv; 1974 struct mpc_group *grp = priv->mpcg; 1975 1976 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1977 __func__, ch->id, grp->outstanding_xid2, 1978 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1979 1980 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1981 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1982 1983 grp->outstanding_xid2--; 1984 grp->outstanding_xid7++; 1985 grp->outstanding_xid7_p2++; 1986 1987 /* must change state before validating xid to */ 1988 /* properly handle interim interrupts received*/ 1989 switch (fsm_getstate(grp->fsm)) { 1990 case MPCG_STATE_XID2INITW: 1991 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1992 mpc_validate_xid(mpcginfo); 1993 break; 1994 case MPCG_STATE_XID0IOWAIT: 1995 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1996 mpc_validate_xid(mpcginfo); 1997 break; 1998 case MPCG_STATE_XID2INITX: 1999 if (grp->outstanding_xid2 == 0) { 2000 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 2001 mpc_validate_xid(mpcginfo); 2002 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2003 } 2004 break; 2005 case MPCG_STATE_XID0IOWAIX: 2006 if (grp->outstanding_xid2 == 0) { 2007 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 2008 mpc_validate_xid(mpcginfo); 2009 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2010 } 2011 break; 2012 } 2013 kfree(mpcginfo); 2014 2015 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 2016 __func__, ch->id, grp->outstanding_xid2, 2017 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2018 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2019 __func__, ch->id, 2020 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2021 return; 2022 2023 } 2024 2025 2026 /* 2027 * MPC Group Station FSM action 2028 * CTCM_PROTO_MPC only 2029 */ 2030 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2031 { 2032 struct mpcg_info *mpcginfo = arg; 2033 struct channel *ch = mpcginfo->ch; 2034 struct net_device *dev = ch->netdev; 2035 struct ctcm_priv *priv = dev->ml_priv; 2036 struct mpc_group *grp = priv->mpcg; 2037 2038 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2039 __func__, smp_processor_id(), ch, ch->id); 2040 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2041 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2042 2043 grp->outstanding_xid7--; 2044 ch->xid_skb->data = ch->xid_skb_data; 2045 skb_reset_tail_pointer(ch->xid_skb); 2046 ch->xid_skb->len = 0; 2047 2048 switch (fsm_getstate(grp->fsm)) { 2049 case MPCG_STATE_XID7INITI: 2050 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2051 mpc_validate_xid(mpcginfo); 2052 break; 2053 case MPCG_STATE_XID7INITW: 2054 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2055 mpc_validate_xid(mpcginfo); 2056 break; 2057 case MPCG_STATE_XID7INITZ: 2058 case MPCG_STATE_XID7INITX: 2059 if (grp->outstanding_xid7 == 0) { 2060 if (grp->outstanding_xid7_p2 > 0) { 2061 grp->outstanding_xid7 = 2062 grp->outstanding_xid7_p2; 2063 grp->outstanding_xid7_p2 = 0; 2064 } else 2065 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2066 2067 mpc_validate_xid(mpcginfo); 2068 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2069 break; 2070 } 2071 mpc_validate_xid(mpcginfo); 2072 break; 2073 } 2074 kfree(mpcginfo); 2075 return; 2076 } 2077 2078 /* 2079 * mpc_action helper of an MPC Group Station FSM action 2080 * CTCM_PROTO_MPC only 2081 */ 2082 static int mpc_send_qllc_discontact(struct net_device *dev) 2083 { 2084 __u32 new_len = 0; 2085 struct sk_buff *skb; 2086 struct qllc *qllcptr; 2087 struct ctcm_priv *priv = dev->ml_priv; 2088 struct mpc_group *grp = priv->mpcg; 2089 2090 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2091 __func__, mpcg_state_names[grp->saved_state]); 2092 2093 switch (grp->saved_state) { 2094 /* 2095 * establish conn callback function is 2096 * preferred method to report failure 2097 */ 2098 case MPCG_STATE_XID0IOWAIT: 2099 case MPCG_STATE_XID0IOWAIX: 2100 case MPCG_STATE_XID7INITI: 2101 case MPCG_STATE_XID7INITZ: 2102 case MPCG_STATE_XID2INITW: 2103 case MPCG_STATE_XID2INITX: 2104 case MPCG_STATE_XID7INITW: 2105 case MPCG_STATE_XID7INITX: 2106 if (grp->estconnfunc) { 2107 grp->estconnfunc(grp->port_num, -1, 0); 2108 grp->estconnfunc = NULL; 2109 break; 2110 } 2111 case MPCG_STATE_FLOWC: 2112 case MPCG_STATE_READY: 2113 grp->send_qllc_disc = 2; 2114 new_len = sizeof(struct qllc); 2115 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2116 if (qllcptr == NULL) { 2117 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2118 "%s(%s): qllcptr allocation error", 2119 CTCM_FUNTAIL, dev->name); 2120 return -ENOMEM; 2121 } 2122 2123 qllcptr->qllc_address = 0xcc; 2124 qllcptr->qllc_commands = 0x03; 2125 2126 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2127 2128 if (skb == NULL) { 2129 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2130 "%s(%s): skb allocation error", 2131 CTCM_FUNTAIL, dev->name); 2132 priv->stats.rx_dropped++; 2133 kfree(qllcptr); 2134 return -ENOMEM; 2135 } 2136 2137 memcpy(skb_put(skb, new_len), qllcptr, new_len); 2138 kfree(qllcptr); 2139 2140 if (skb_headroom(skb) < 4) { 2141 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2142 "%s(%s): skb_headroom error", 2143 CTCM_FUNTAIL, dev->name); 2144 dev_kfree_skb_any(skb); 2145 return -ENOMEM; 2146 } 2147 2148 *((__u32 *)skb_push(skb, 4)) = 2149 priv->channel[CTCM_READ]->pdu_seq; 2150 priv->channel[CTCM_READ]->pdu_seq++; 2151 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2152 __func__, priv->channel[CTCM_READ]->pdu_seq); 2153 2154 /* receipt of CC03 resets anticipated sequence number on 2155 receiving side */ 2156 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2157 skb_reset_mac_header(skb); 2158 skb->dev = dev; 2159 skb->protocol = htons(ETH_P_SNAP); 2160 skb->ip_summed = CHECKSUM_UNNECESSARY; 2161 2162 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2163 2164 netif_rx(skb); 2165 break; 2166 default: 2167 break; 2168 2169 } 2170 2171 return 0; 2172 } 2173 /* --- This is the END my friend --- */ 2174 2175