1 /* 2 * drivers/s390/net/ctcm_mpc.c 3 * 4 * Copyright IBM Corp. 2004, 2007 5 * Authors: Belinda Thompson (belindat@us.ibm.com) 6 * Andy Richter (richtera@us.ibm.com) 7 * Peter Tiedemann (ptiedem@de.ibm.com) 8 */ 9 10 /* 11 This module exports functions to be used by CCS: 12 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 13 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 14 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 15 EXPORT_SYMBOL(ctc_mpc_flow_control); 16 */ 17 18 #undef DEBUG 19 #undef DEBUGDATA 20 #undef DEBUGCCW 21 22 #define KMSG_COMPONENT "ctcm" 23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 24 25 #include <linux/module.h> 26 #include <linux/init.h> 27 #include <linux/kernel.h> 28 #include <linux/slab.h> 29 #include <linux/errno.h> 30 #include <linux/types.h> 31 #include <linux/interrupt.h> 32 #include <linux/timer.h> 33 #include <linux/sched.h> 34 35 #include <linux/signal.h> 36 #include <linux/string.h> 37 #include <linux/proc_fs.h> 38 39 #include <linux/ip.h> 40 #include <linux/if_arp.h> 41 #include <linux/tcp.h> 42 #include <linux/skbuff.h> 43 #include <linux/ctype.h> 44 #include <linux/netdevice.h> 45 #include <net/dst.h> 46 47 #include <linux/io.h> /* instead of <asm/io.h> ok ? */ 48 #include <asm/ccwdev.h> 49 #include <asm/ccwgroup.h> 50 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */ 51 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */ 52 #include <linux/wait.h> 53 #include <linux/moduleparam.h> 54 #include <asm/idals.h> 55 56 #include "ctcm_mpc.h" 57 #include "ctcm_main.h" 58 #include "ctcm_fsms.h" 59 60 static const struct xid2 init_xid = { 61 .xid2_type_id = XID_FM2, 62 .xid2_len = 0x45, 63 .xid2_adj_id = 0, 64 .xid2_rlen = 0x31, 65 .xid2_resv1 = 0, 66 .xid2_flag1 = 0, 67 .xid2_fmtt = 0, 68 .xid2_flag4 = 0x80, 69 .xid2_resv2 = 0, 70 .xid2_tgnum = 0, 71 .xid2_sender_id = 0, 72 .xid2_flag2 = 0, 73 .xid2_option = XID2_0, 74 .xid2_resv3 = "\x00", 75 .xid2_resv4 = 0, 76 .xid2_dlc_type = XID2_READ_SIDE, 77 .xid2_resv5 = 0, 78 .xid2_mpc_flag = 0, 79 .xid2_resv6 = 0, 80 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), 81 }; 82 83 static const struct th_header thnorm = { 84 .th_seg = 0x00, 85 .th_ch_flag = TH_IS_XID, 86 .th_blk_flag = TH_DATA_IS_XID, 87 .th_is_xid = 0x01, 88 .th_seq_num = 0x00000000, 89 }; 90 91 static const struct th_header thdummy = { 92 .th_seg = 0x00, 93 .th_ch_flag = 0x00, 94 .th_blk_flag = TH_DATA_IS_XID, 95 .th_is_xid = 0x01, 96 .th_seq_num = 0x00000000, 97 }; 98 99 /* 100 * Definition of one MPC group 101 */ 102 103 /* 104 * Compatibility macros for busy handling 105 * of network devices. 106 */ 107 108 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 109 110 /* 111 * MPC Group state machine actions (static prototypes) 112 */ 113 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 114 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 115 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 116 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 117 static int mpc_validate_xid(struct mpcg_info *mpcginfo); 118 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 119 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 120 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 121 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 122 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 123 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 124 125 #ifdef DEBUGDATA 126 /*-------------------------------------------------------------------* 127 * Dump buffer format * 128 * * 129 *--------------------------------------------------------------------*/ 130 void ctcmpc_dumpit(char *buf, int len) 131 { 132 __u32 ct, sw, rm, dup; 133 char *ptr, *rptr; 134 char tbuf[82], tdup[82]; 135 #if (UTS_MACHINE == s390x) 136 char addr[22]; 137 #else 138 char addr[12]; 139 #endif 140 char boff[12]; 141 char bhex[82], duphex[82]; 142 char basc[40]; 143 144 sw = 0; 145 rptr = ptr = buf; 146 rm = 16; 147 duphex[0] = 0x00; 148 dup = 0; 149 150 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 151 if (sw == 0) { 152 #if (UTS_MACHINE == s390x) 153 sprintf(addr, "%16.16lx", (__u64)rptr); 154 #else 155 sprintf(addr, "%8.8X", (__u32)rptr); 156 #endif 157 158 sprintf(boff, "%4.4X", (__u32)ct); 159 bhex[0] = '\0'; 160 basc[0] = '\0'; 161 } 162 if ((sw == 4) || (sw == 12)) 163 strcat(bhex, " "); 164 if (sw == 8) 165 strcat(bhex, " "); 166 167 #if (UTS_MACHINE == s390x) 168 sprintf(tbuf, "%2.2lX", (__u64)*ptr); 169 #else 170 sprintf(tbuf, "%2.2X", (__u32)*ptr); 171 #endif 172 173 tbuf[2] = '\0'; 174 strcat(bhex, tbuf); 175 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 176 basc[sw] = *ptr; 177 else 178 basc[sw] = '.'; 179 180 basc[sw+1] = '\0'; 181 sw++; 182 rm--; 183 if (sw != 16) 184 continue; 185 if ((strcmp(duphex, bhex)) != 0) { 186 if (dup != 0) { 187 sprintf(tdup, 188 "Duplicate as above to %s", addr); 189 ctcm_pr_debug(" --- %s ---\n", 190 tdup); 191 } 192 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 193 addr, boff, bhex, basc); 194 dup = 0; 195 strcpy(duphex, bhex); 196 } else 197 dup++; 198 199 sw = 0; 200 rm = 16; 201 } /* endfor */ 202 203 if (sw != 0) { 204 for ( ; rm > 0; rm--, sw++) { 205 if ((sw == 4) || (sw == 12)) 206 strcat(bhex, " "); 207 if (sw == 8) 208 strcat(bhex, " "); 209 strcat(bhex, " "); 210 strcat(basc, " "); 211 } 212 if (dup != 0) { 213 sprintf(tdup, "Duplicate as above to %s", addr); 214 ctcm_pr_debug(" --- %s ---\n", tdup); 215 } 216 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 217 addr, boff, bhex, basc); 218 } else { 219 if (dup >= 1) { 220 sprintf(tdup, "Duplicate as above to %s", addr); 221 ctcm_pr_debug(" --- %s ---\n", tdup); 222 } 223 if (dup != 0) { 224 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 225 addr, boff, bhex, basc); 226 } 227 } 228 229 return; 230 231 } /* end of ctcmpc_dumpit */ 232 #endif 233 234 #ifdef DEBUGDATA 235 /* 236 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 237 * 238 * skb The sk_buff to dump. 239 * offset Offset relative to skb-data, where to start the dump. 240 */ 241 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 242 { 243 __u8 *p = skb->data; 244 struct th_header *header; 245 struct pdu *pheader; 246 int bl = skb->len; 247 int i; 248 249 if (p == NULL) 250 return; 251 252 p += offset; 253 header = (struct th_header *)p; 254 255 ctcm_pr_debug("dump:\n"); 256 ctcm_pr_debug("skb len=%d \n", skb->len); 257 if (skb->len > 2) { 258 switch (header->th_ch_flag) { 259 case TH_HAS_PDU: 260 break; 261 case 0x00: 262 case TH_IS_XID: 263 if ((header->th_blk_flag == TH_DATA_IS_XID) && 264 (header->th_is_xid == 0x01)) 265 goto dumpth; 266 case TH_SWEEP_REQ: 267 goto dumpth; 268 case TH_SWEEP_RESP: 269 goto dumpth; 270 default: 271 break; 272 } 273 274 pheader = (struct pdu *)p; 275 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 276 pheader->pdu_offset, pheader->pdu_offset); 277 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 278 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 279 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 280 goto dumpdata; 281 282 dumpth: 283 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 284 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 285 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 286 ctcm_pr_debug("th->type : %s\n", 287 (header->th_is_xid) ? "DATA" : "XID"); 288 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 289 290 } 291 dumpdata: 292 if (bl > 32) 293 bl = 32; 294 ctcm_pr_debug("data: "); 295 for (i = 0; i < bl; i++) 296 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 297 ctcm_pr_debug("\n"); 298 } 299 #endif 300 301 static struct net_device *ctcmpc_get_dev(int port_num) 302 { 303 char device[20]; 304 struct net_device *dev; 305 struct ctcm_priv *priv; 306 307 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 308 309 dev = __dev_get_by_name(&init_net, device); 310 311 if (dev == NULL) { 312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 313 "%s: Device not found by name: %s", 314 CTCM_FUNTAIL, device); 315 return NULL; 316 } 317 priv = dev->ml_priv; 318 if (priv == NULL) { 319 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 320 "%s(%s): dev->ml_priv is NULL", 321 CTCM_FUNTAIL, device); 322 return NULL; 323 } 324 if (priv->mpcg == NULL) { 325 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 326 "%s(%s): priv->mpcg is NULL", 327 CTCM_FUNTAIL, device); 328 return NULL; 329 } 330 return dev; 331 } 332 333 /* 334 * ctc_mpc_alloc_channel 335 * (exported interface) 336 * 337 * Device Initialization : 338 * ACTPATH driven IO operations 339 */ 340 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 341 { 342 struct net_device *dev; 343 struct mpc_group *grp; 344 struct ctcm_priv *priv; 345 346 dev = ctcmpc_get_dev(port_num); 347 if (dev == NULL) 348 return 1; 349 priv = dev->ml_priv; 350 grp = priv->mpcg; 351 352 grp->allochanfunc = callback; 353 grp->port_num = port_num; 354 grp->port_persist = 1; 355 356 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 357 "%s(%s): state=%s", 358 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 359 360 switch (fsm_getstate(grp->fsm)) { 361 case MPCG_STATE_INOP: 362 /* Group is in the process of terminating */ 363 grp->alloc_called = 1; 364 break; 365 case MPCG_STATE_RESET: 366 /* MPC Group will transition to state */ 367 /* MPCG_STATE_XID2INITW iff the minimum number */ 368 /* of 1 read and 1 write channel have successfully*/ 369 /* activated */ 370 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 371 if (callback) 372 grp->send_qllc_disc = 1; 373 case MPCG_STATE_XID0IOWAIT: 374 fsm_deltimer(&grp->timer); 375 grp->outstanding_xid2 = 0; 376 grp->outstanding_xid7 = 0; 377 grp->outstanding_xid7_p2 = 0; 378 grp->saved_xid2 = NULL; 379 if (callback) 380 ctcm_open(dev); 381 fsm_event(priv->fsm, DEV_EVENT_START, dev); 382 break; 383 case MPCG_STATE_READY: 384 /* XID exchanges completed after PORT was activated */ 385 /* Link station already active */ 386 /* Maybe timing issue...retry callback */ 387 grp->allocchan_callback_retries++; 388 if (grp->allocchan_callback_retries < 4) { 389 if (grp->allochanfunc) 390 grp->allochanfunc(grp->port_num, 391 grp->group_max_buflen); 392 } else { 393 /* there are problems...bail out */ 394 /* there may be a state mismatch so restart */ 395 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 396 grp->allocchan_callback_retries = 0; 397 } 398 break; 399 } 400 401 return 0; 402 } 403 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 404 405 /* 406 * ctc_mpc_establish_connectivity 407 * (exported interface) 408 */ 409 void ctc_mpc_establish_connectivity(int port_num, 410 void (*callback)(int, int, int)) 411 { 412 struct net_device *dev; 413 struct mpc_group *grp; 414 struct ctcm_priv *priv; 415 struct channel *rch, *wch; 416 417 dev = ctcmpc_get_dev(port_num); 418 if (dev == NULL) 419 return; 420 priv = dev->ml_priv; 421 grp = priv->mpcg; 422 rch = priv->channel[READ]; 423 wch = priv->channel[WRITE]; 424 425 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 426 "%s(%s): state=%s", 427 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 428 429 grp->estconnfunc = callback; 430 grp->port_num = port_num; 431 432 switch (fsm_getstate(grp->fsm)) { 433 case MPCG_STATE_READY: 434 /* XID exchanges completed after PORT was activated */ 435 /* Link station already active */ 436 /* Maybe timing issue...retry callback */ 437 fsm_deltimer(&grp->timer); 438 grp->estconn_callback_retries++; 439 if (grp->estconn_callback_retries < 4) { 440 if (grp->estconnfunc) { 441 grp->estconnfunc(grp->port_num, 0, 442 grp->group_max_buflen); 443 grp->estconnfunc = NULL; 444 } 445 } else { 446 /* there are problems...bail out */ 447 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 448 grp->estconn_callback_retries = 0; 449 } 450 break; 451 case MPCG_STATE_INOP: 452 case MPCG_STATE_RESET: 453 /* MPC Group is not ready to start XID - min num of */ 454 /* 1 read and 1 write channel have not been acquired*/ 455 456 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 457 "%s(%s): REJECTED - inactive channels", 458 CTCM_FUNTAIL, dev->name); 459 if (grp->estconnfunc) { 460 grp->estconnfunc(grp->port_num, -1, 0); 461 grp->estconnfunc = NULL; 462 } 463 break; 464 case MPCG_STATE_XID2INITW: 465 /* alloc channel was called but no XID exchange */ 466 /* has occurred. initiate xside XID exchange */ 467 /* make sure yside XID0 processing has not started */ 468 469 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 470 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 471 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 472 "%s(%s): ABORT - PASSIVE XID", 473 CTCM_FUNTAIL, dev->name); 474 break; 475 } 476 grp->send_qllc_disc = 1; 477 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 478 fsm_deltimer(&grp->timer); 479 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 480 MPCG_EVENT_TIMER, dev); 481 grp->outstanding_xid7 = 0; 482 grp->outstanding_xid7_p2 = 0; 483 grp->saved_xid2 = NULL; 484 if ((rch->in_mpcgroup) && 485 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 486 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 487 else { 488 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 489 "%s(%s): RX-%s not ready for ACTIVE XID0", 490 CTCM_FUNTAIL, dev->name, rch->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 if ((wch->in_mpcgroup) && 499 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 500 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 501 else { 502 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 503 "%s(%s): WX-%s not ready for ACTIVE XID0", 504 CTCM_FUNTAIL, dev->name, wch->id); 505 if (grp->estconnfunc) { 506 grp->estconnfunc(grp->port_num, -1, 0); 507 grp->estconnfunc = NULL; 508 } 509 fsm_deltimer(&grp->timer); 510 goto done; 511 } 512 break; 513 case MPCG_STATE_XID0IOWAIT: 514 /* already in active XID negotiations */ 515 default: 516 break; 517 } 518 519 done: 520 CTCM_PR_DEBUG("Exit %s()\n", __func__); 521 return; 522 } 523 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 524 525 /* 526 * ctc_mpc_dealloc_ch 527 * (exported interface) 528 */ 529 void ctc_mpc_dealloc_ch(int port_num) 530 { 531 struct net_device *dev; 532 struct ctcm_priv *priv; 533 struct mpc_group *grp; 534 535 dev = ctcmpc_get_dev(port_num); 536 if (dev == NULL) 537 return; 538 priv = dev->ml_priv; 539 grp = priv->mpcg; 540 541 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 542 "%s: %s: refcount = %d\n", 543 CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt)); 544 545 fsm_deltimer(&priv->restart_timer); 546 grp->channels_terminating = 0; 547 fsm_deltimer(&grp->timer); 548 grp->allochanfunc = NULL; 549 grp->estconnfunc = NULL; 550 grp->port_persist = 0; 551 grp->send_qllc_disc = 0; 552 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 553 554 ctcm_close(dev); 555 return; 556 } 557 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 558 559 /* 560 * ctc_mpc_flow_control 561 * (exported interface) 562 */ 563 void ctc_mpc_flow_control(int port_num, int flowc) 564 { 565 struct ctcm_priv *priv; 566 struct mpc_group *grp; 567 struct net_device *dev; 568 struct channel *rch; 569 int mpcg_state; 570 571 dev = ctcmpc_get_dev(port_num); 572 if (dev == NULL) 573 return; 574 priv = dev->ml_priv; 575 grp = priv->mpcg; 576 577 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 578 "%s: %s: flowc = %d", 579 CTCM_FUNTAIL, dev->name, flowc); 580 581 rch = priv->channel[READ]; 582 583 mpcg_state = fsm_getstate(grp->fsm); 584 switch (flowc) { 585 case 1: 586 if (mpcg_state == MPCG_STATE_FLOWC) 587 break; 588 if (mpcg_state == MPCG_STATE_READY) { 589 if (grp->flow_off_called == 1) 590 grp->flow_off_called = 0; 591 else 592 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 593 break; 594 } 595 break; 596 case 0: 597 if (mpcg_state == MPCG_STATE_FLOWC) { 598 fsm_newstate(grp->fsm, MPCG_STATE_READY); 599 /* ensure any data that has accumulated */ 600 /* on the io_queue will now be sen t */ 601 tasklet_schedule(&rch->ch_tasklet); 602 } 603 /* possible race condition */ 604 if (mpcg_state == MPCG_STATE_READY) { 605 grp->flow_off_called = 1; 606 break; 607 } 608 break; 609 } 610 611 } 612 EXPORT_SYMBOL(ctc_mpc_flow_control); 613 614 static int mpc_send_qllc_discontact(struct net_device *); 615 616 /* 617 * helper function of ctcmpc_unpack_skb 618 */ 619 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 620 { 621 struct channel *rch = mpcginfo->ch; 622 struct net_device *dev = rch->netdev; 623 struct ctcm_priv *priv = dev->ml_priv; 624 struct mpc_group *grp = priv->mpcg; 625 struct channel *ch = priv->channel[WRITE]; 626 627 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 628 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 629 630 grp->sweep_rsp_pend_num--; 631 632 if ((grp->sweep_req_pend_num == 0) && 633 (grp->sweep_rsp_pend_num == 0)) { 634 fsm_deltimer(&ch->sweep_timer); 635 grp->in_sweep = 0; 636 rch->th_seq_num = 0x00; 637 ch->th_seq_num = 0x00; 638 ctcm_clear_busy_do(dev); 639 } 640 641 kfree(mpcginfo); 642 643 return; 644 645 } 646 647 /* 648 * helper function of mpc_rcvd_sweep_req 649 * which is a helper of ctcmpc_unpack_skb 650 */ 651 static void ctcmpc_send_sweep_resp(struct channel *rch) 652 { 653 struct net_device *dev = rch->netdev; 654 struct ctcm_priv *priv = dev->ml_priv; 655 struct mpc_group *grp = priv->mpcg; 656 int rc = 0; 657 struct th_sweep *header; 658 struct sk_buff *sweep_skb; 659 struct channel *ch = priv->channel[WRITE]; 660 661 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 662 663 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 664 if (sweep_skb == NULL) { 665 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 666 "%s(%s): sweep_skb allocation ERROR\n", 667 CTCM_FUNTAIL, rch->id); 668 rc = -ENOMEM; 669 goto done; 670 } 671 672 header = (struct th_sweep *) 673 kmalloc(sizeof(struct th_sweep), gfp_type()); 674 675 if (!header) { 676 dev_kfree_skb_any(sweep_skb); 677 rc = -ENOMEM; 678 goto done; 679 } 680 681 header->th.th_seg = 0x00 ; 682 header->th.th_ch_flag = TH_SWEEP_RESP; 683 header->th.th_blk_flag = 0x00; 684 header->th.th_is_xid = 0x00; 685 header->th.th_seq_num = 0x00; 686 header->sw.th_last_seq = ch->th_seq_num; 687 688 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 689 690 kfree(header); 691 692 dev->trans_start = jiffies; 693 skb_queue_tail(&ch->sweep_queue, sweep_skb); 694 695 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 696 697 return; 698 699 done: 700 grp->in_sweep = 0; 701 ctcm_clear_busy_do(dev); 702 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 703 704 return; 705 } 706 707 /* 708 * helper function of ctcmpc_unpack_skb 709 */ 710 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 711 { 712 struct channel *rch = mpcginfo->ch; 713 struct net_device *dev = rch->netdev; 714 struct ctcm_priv *priv = dev->ml_priv; 715 struct mpc_group *grp = priv->mpcg; 716 struct channel *ch = priv->channel[WRITE]; 717 718 if (do_debug) 719 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 720 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 721 722 if (grp->in_sweep == 0) { 723 grp->in_sweep = 1; 724 ctcm_test_and_set_busy(dev); 725 grp->sweep_req_pend_num = grp->active_channels[READ]; 726 grp->sweep_rsp_pend_num = grp->active_channels[READ]; 727 } 728 729 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 730 731 grp->sweep_req_pend_num--; 732 ctcmpc_send_sweep_resp(ch); 733 kfree(mpcginfo); 734 return; 735 } 736 737 /* 738 * MPC Group Station FSM definitions 739 */ 740 static const char *mpcg_event_names[] = { 741 [MPCG_EVENT_INOP] = "INOP Condition", 742 [MPCG_EVENT_DISCONC] = "Discontact Received", 743 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 744 [MPCG_EVENT_XID2] = "XID2 Received", 745 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 746 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 747 [MPCG_EVENT_TIMER] = "XID Setup Timer", 748 [MPCG_EVENT_DOIO] = "XID DoIO", 749 }; 750 751 static const char *mpcg_state_names[] = { 752 [MPCG_STATE_RESET] = "Reset", 753 [MPCG_STATE_INOP] = "INOP", 754 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 755 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 756 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 757 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 758 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 759 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 760 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 761 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 762 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 763 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 764 [MPCG_STATE_READY] = "READY", 765 }; 766 767 /* 768 * The MPC Group Station FSM 769 * 22 events 770 */ 771 static const fsm_node mpcg_fsm[] = { 772 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 773 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 774 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 775 776 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 777 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 778 779 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 780 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 781 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 782 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 783 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 784 785 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 786 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 787 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 788 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 789 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 790 791 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 792 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 793 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 794 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 795 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 796 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 797 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 798 799 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 800 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 801 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 802 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 803 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 804 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 805 806 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 807 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 808 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 809 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 810 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 811 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 812 813 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 814 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 815 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 816 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 817 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 818 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 819 820 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 821 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 822 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 823 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 824 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 825 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 826 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 827 828 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 829 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 830 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 831 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 832 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 833 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 834 835 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 836 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 837 }; 838 839 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 840 841 /* 842 * MPC Group Station FSM action 843 * CTCM_PROTO_MPC only 844 */ 845 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 846 { 847 struct net_device *dev = arg; 848 struct ctcm_priv *priv = dev->ml_priv; 849 struct mpc_group *grp = priv->mpcg; 850 851 if (grp == NULL) { 852 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 853 "%s(%s): No MPC group", 854 CTCM_FUNTAIL, dev->name); 855 return; 856 } 857 858 fsm_deltimer(&grp->timer); 859 860 if (grp->saved_xid2->xid2_flag2 == 0x40) { 861 priv->xid->xid2_flag2 = 0x00; 862 if (grp->estconnfunc) { 863 grp->estconnfunc(grp->port_num, 1, 864 grp->group_max_buflen); 865 grp->estconnfunc = NULL; 866 } else if (grp->allochanfunc) 867 grp->send_qllc_disc = 1; 868 869 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 870 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 871 "%s(%s): fails", 872 CTCM_FUNTAIL, dev->name); 873 return; 874 } 875 876 grp->port_persist = 1; 877 grp->out_of_sequence = 0; 878 grp->estconn_called = 0; 879 880 tasklet_hi_schedule(&grp->mpc_tasklet2); 881 882 return; 883 } 884 885 /* 886 * helper of ctcm_init_netdevice 887 * CTCM_PROTO_MPC only 888 */ 889 void mpc_group_ready(unsigned long adev) 890 { 891 struct net_device *dev = (struct net_device *)adev; 892 struct ctcm_priv *priv = dev->ml_priv; 893 struct mpc_group *grp = priv->mpcg; 894 struct channel *ch = NULL; 895 896 if (grp == NULL) { 897 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 898 "%s(%s): No MPC group", 899 CTCM_FUNTAIL, dev->name); 900 return; 901 } 902 903 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 904 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 905 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 906 907 fsm_newstate(grp->fsm, MPCG_STATE_READY); 908 909 /* Put up a read on the channel */ 910 ch = priv->channel[READ]; 911 ch->pdu_seq = 0; 912 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 913 __func__, ch->pdu_seq); 914 915 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 916 /* Put the write channel in idle state */ 917 ch = priv->channel[WRITE]; 918 if (ch->collect_len > 0) { 919 spin_lock(&ch->collect_lock); 920 ctcm_purge_skb_queue(&ch->collect_queue); 921 ch->collect_len = 0; 922 spin_unlock(&ch->collect_lock); 923 } 924 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 925 ctcm_clear_busy(dev); 926 927 if (grp->estconnfunc) { 928 grp->estconnfunc(grp->port_num, 0, 929 grp->group_max_buflen); 930 grp->estconnfunc = NULL; 931 } else if (grp->allochanfunc) 932 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 933 934 grp->send_qllc_disc = 1; 935 grp->changed_side = 0; 936 937 return; 938 939 } 940 941 /* 942 * Increment the MPC Group Active Channel Counts 943 * helper of dev_action (called from channel fsm) 944 */ 945 void mpc_channel_action(struct channel *ch, int direction, int action) 946 { 947 struct net_device *dev = ch->netdev; 948 struct ctcm_priv *priv = dev->ml_priv; 949 struct mpc_group *grp = priv->mpcg; 950 951 if (grp == NULL) { 952 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 953 "%s(%s): No MPC group", 954 CTCM_FUNTAIL, dev->name); 955 return; 956 } 957 958 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 959 960 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 961 "%s: %i / Grp:%s total_channels=%i, active_channels: " 962 "read=%i, write=%i\n", __func__, action, 963 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 964 grp->active_channels[READ], grp->active_channels[WRITE]); 965 966 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 967 grp->num_channel_paths++; 968 grp->active_channels[direction]++; 969 grp->outstanding_xid2++; 970 ch->in_mpcgroup = 1; 971 972 if (ch->xid_skb != NULL) 973 dev_kfree_skb_any(ch->xid_skb); 974 975 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 976 GFP_ATOMIC | GFP_DMA); 977 if (ch->xid_skb == NULL) { 978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 979 "%s(%s): Couldn't alloc ch xid_skb\n", 980 CTCM_FUNTAIL, dev->name); 981 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 982 return; 983 } 984 ch->xid_skb_data = ch->xid_skb->data; 985 ch->xid_th = (struct th_header *)ch->xid_skb->data; 986 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 987 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 988 skb_put(ch->xid_skb, XID2_LENGTH); 989 ch->xid_id = skb_tail_pointer(ch->xid_skb); 990 ch->xid_skb->data = ch->xid_skb_data; 991 skb_reset_tail_pointer(ch->xid_skb); 992 ch->xid_skb->len = 0; 993 994 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len), 995 grp->xid_skb->data, 996 grp->xid_skb->len); 997 998 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ) 999 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 1000 1001 if (CHANNEL_DIRECTION(ch->flags) == WRITE) 1002 ch->xid->xid2_buf_len = 0x00; 1003 1004 ch->xid_skb->data = ch->xid_skb_data; 1005 skb_reset_tail_pointer(ch->xid_skb); 1006 ch->xid_skb->len = 0; 1007 1008 fsm_newstate(ch->fsm, CH_XID0_PENDING); 1009 1010 if ((grp->active_channels[READ] > 0) && 1011 (grp->active_channels[WRITE] > 0) && 1012 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 1013 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1014 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 1015 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1016 __func__, dev->name); 1017 } 1018 } else if ((action == MPC_CHANNEL_REMOVE) && 1019 (ch->in_mpcgroup == 1)) { 1020 ch->in_mpcgroup = 0; 1021 grp->num_channel_paths--; 1022 grp->active_channels[direction]--; 1023 1024 if (ch->xid_skb != NULL) 1025 dev_kfree_skb_any(ch->xid_skb); 1026 ch->xid_skb = NULL; 1027 1028 if (grp->channels_terminating) 1029 goto done; 1030 1031 if (((grp->active_channels[READ] == 0) && 1032 (grp->active_channels[WRITE] > 0)) 1033 || ((grp->active_channels[WRITE] == 0) && 1034 (grp->active_channels[READ] > 0))) 1035 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1036 } 1037 done: 1038 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1039 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1040 "read=%i, write=%i\n", __func__, action, 1041 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1042 grp->active_channels[READ], grp->active_channels[WRITE]); 1043 1044 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1045 } 1046 1047 /** 1048 * Unpack a just received skb and hand it over to 1049 * upper layers. 1050 * special MPC version of unpack_skb. 1051 * 1052 * ch The channel where this skb has been received. 1053 * pskb The received skb. 1054 */ 1055 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1056 { 1057 struct net_device *dev = ch->netdev; 1058 struct ctcm_priv *priv = dev->ml_priv; 1059 struct mpc_group *grp = priv->mpcg; 1060 struct pdu *curr_pdu; 1061 struct mpcg_info *mpcginfo; 1062 struct th_header *header = NULL; 1063 struct th_sweep *sweep = NULL; 1064 int pdu_last_seen = 0; 1065 __u32 new_len; 1066 struct sk_buff *skb; 1067 int skblen; 1068 int sendrc = 0; 1069 1070 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1071 __func__, dev->name, smp_processor_id(), ch->id); 1072 1073 header = (struct th_header *)pskb->data; 1074 if ((header->th_seg == 0) && 1075 (header->th_ch_flag == 0) && 1076 (header->th_blk_flag == 0) && 1077 (header->th_seq_num == 0)) 1078 /* nothing for us */ goto done; 1079 1080 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1081 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1082 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1083 1084 pskb->dev = dev; 1085 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1086 skb_pull(pskb, TH_HEADER_LENGTH); 1087 1088 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1089 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1090 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1091 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1092 (header->th_seq_num != ch->th_seq_num + 1) && 1093 (ch->th_seq_num != 0))) { 1094 /* This is NOT the next segment * 1095 * we are not the correct race winner * 1096 * go away and let someone else win * 1097 * BUT..this only applies if xid negot * 1098 * is done * 1099 */ 1100 grp->out_of_sequence += 1; 1101 __skb_push(pskb, TH_HEADER_LENGTH); 1102 skb_queue_tail(&ch->io_queue, pskb); 1103 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1104 "got:%08x\n", __func__, 1105 ch->th_seq_num + 1, header->th_seq_num); 1106 1107 return; 1108 } 1109 grp->out_of_sequence = 0; 1110 ch->th_seq_num = header->th_seq_num; 1111 1112 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1113 __func__, ch->th_seq_num); 1114 1115 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1116 goto done; 1117 while ((pskb->len > 0) && !pdu_last_seen) { 1118 curr_pdu = (struct pdu *)pskb->data; 1119 1120 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1121 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1122 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1123 __func__, pskb->len); 1124 1125 skb_pull(pskb, PDU_HEADER_LENGTH); 1126 1127 if (curr_pdu->pdu_flag & PDU_LAST) 1128 pdu_last_seen = 1; 1129 if (curr_pdu->pdu_flag & PDU_CNTL) 1130 pskb->protocol = htons(ETH_P_SNAP); 1131 else 1132 pskb->protocol = htons(ETH_P_SNA_DIX); 1133 1134 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1135 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1136 "%s(%s): Dropping packet with " 1137 "illegal siize %d", 1138 CTCM_FUNTAIL, dev->name, pskb->len); 1139 1140 priv->stats.rx_dropped++; 1141 priv->stats.rx_length_errors++; 1142 goto done; 1143 } 1144 skb_reset_mac_header(pskb); 1145 new_len = curr_pdu->pdu_offset; 1146 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1147 __func__, new_len); 1148 if ((new_len == 0) || (new_len > pskb->len)) { 1149 /* should never happen */ 1150 /* pskb len must be hosed...bail out */ 1151 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1152 "%s(%s): non valid pdu_offset: %04x", 1153 /* "data may be lost", */ 1154 CTCM_FUNTAIL, dev->name, new_len); 1155 goto done; 1156 } 1157 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1158 1159 if (!skb) { 1160 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1161 "%s(%s): MEMORY allocation error", 1162 CTCM_FUNTAIL, dev->name); 1163 priv->stats.rx_dropped++; 1164 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1165 goto done; 1166 } 1167 memcpy(skb_put(skb, new_len), pskb->data, new_len); 1168 1169 skb_reset_mac_header(skb); 1170 skb->dev = pskb->dev; 1171 skb->protocol = pskb->protocol; 1172 skb->ip_summed = CHECKSUM_UNNECESSARY; 1173 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1174 ch->pdu_seq++; 1175 1176 if (do_debug_data) { 1177 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1178 __func__, ch->pdu_seq); 1179 ctcm_pr_debug("%s: skb:%0lx " 1180 "skb len: %d \n", __func__, 1181 (unsigned long)skb, skb->len); 1182 ctcm_pr_debug("%s: up to 32 bytes " 1183 "of pdu_data sent\n", __func__); 1184 ctcmpc_dump32((char *)skb->data, skb->len); 1185 } 1186 1187 skblen = skb->len; 1188 sendrc = netif_rx(skb); 1189 priv->stats.rx_packets++; 1190 priv->stats.rx_bytes += skblen; 1191 skb_pull(pskb, new_len); /* point to next PDU */ 1192 } 1193 } else { 1194 mpcginfo = (struct mpcg_info *) 1195 kmalloc(sizeof(struct mpcg_info), gfp_type()); 1196 if (mpcginfo == NULL) 1197 goto done; 1198 1199 mpcginfo->ch = ch; 1200 mpcginfo->th = header; 1201 mpcginfo->skb = pskb; 1202 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1203 __func__); 1204 /* it's a sweep? */ 1205 sweep = (struct th_sweep *)pskb->data; 1206 mpcginfo->sweep = sweep; 1207 if (header->th_ch_flag == TH_SWEEP_REQ) 1208 mpc_rcvd_sweep_req(mpcginfo); 1209 else if (header->th_ch_flag == TH_SWEEP_RESP) 1210 mpc_rcvd_sweep_resp(mpcginfo); 1211 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1212 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1213 skb_pull(pskb, XID2_LENGTH); 1214 mpcginfo->xid = thisxid; 1215 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1216 } else if (header->th_blk_flag == TH_DISCONTACT) 1217 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1218 else if (header->th_seq_num != 0) { 1219 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1220 "%s(%s): control pkt expected\n", 1221 CTCM_FUNTAIL, dev->name); 1222 priv->stats.rx_dropped++; 1223 /* mpcginfo only used for non-data transfers */ 1224 kfree(mpcginfo); 1225 if (do_debug_data) 1226 ctcmpc_dump_skb(pskb, -8); 1227 } 1228 } 1229 done: 1230 1231 dev_kfree_skb_any(pskb); 1232 if (sendrc == NET_RX_DROP) { 1233 dev_warn(&dev->dev, 1234 "The network backlog for %s is exceeded, " 1235 "package dropped\n", __func__); 1236 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1237 } 1238 1239 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1240 __func__, dev->name, ch, ch->id); 1241 } 1242 1243 /** 1244 * tasklet helper for mpc's skb unpacking. 1245 * 1246 * ch The channel to work on. 1247 * Allow flow control back pressure to occur here. 1248 * Throttling back channel can result in excessive 1249 * channel inactivity and system deact of channel 1250 */ 1251 void ctcmpc_bh(unsigned long thischan) 1252 { 1253 struct channel *ch = (struct channel *)thischan; 1254 struct sk_buff *skb; 1255 struct net_device *dev = ch->netdev; 1256 struct ctcm_priv *priv = dev->ml_priv; 1257 struct mpc_group *grp = priv->mpcg; 1258 1259 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1260 dev->name, smp_processor_id(), __func__, ch->id); 1261 /* caller has requested driver to throttle back */ 1262 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1263 (skb = skb_dequeue(&ch->io_queue))) { 1264 ctcmpc_unpack_skb(ch, skb); 1265 if (grp->out_of_sequence > 20) { 1266 /* assume data loss has occurred if */ 1267 /* missing seq_num for extended */ 1268 /* period of time */ 1269 grp->out_of_sequence = 0; 1270 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1271 break; 1272 } 1273 if (skb == skb_peek(&ch->io_queue)) 1274 break; 1275 } 1276 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1277 __func__, dev->name, ch, ch->id); 1278 return; 1279 } 1280 1281 /* 1282 * MPC Group Initializations 1283 */ 1284 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1285 { 1286 struct mpc_group *grp; 1287 1288 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1289 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1290 1291 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1292 if (grp == NULL) 1293 return NULL; 1294 1295 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1296 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1297 mpcg_fsm_len, GFP_KERNEL); 1298 if (grp->fsm == NULL) { 1299 kfree(grp); 1300 return NULL; 1301 } 1302 1303 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1304 fsm_settimer(grp->fsm, &grp->timer); 1305 1306 grp->xid_skb = 1307 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1308 if (grp->xid_skb == NULL) { 1309 kfree_fsm(grp->fsm); 1310 kfree(grp); 1311 return NULL; 1312 } 1313 /* base xid for all channels in group */ 1314 grp->xid_skb_data = grp->xid_skb->data; 1315 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1316 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH), 1317 &thnorm, TH_HEADER_LENGTH); 1318 1319 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1320 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH); 1321 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1322 grp->xid->xid2_sender_id = jiffies; 1323 1324 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1325 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4); 1326 1327 grp->rcvd_xid_skb = 1328 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1329 if (grp->rcvd_xid_skb == NULL) { 1330 kfree_fsm(grp->fsm); 1331 dev_kfree_skb(grp->xid_skb); 1332 kfree(grp); 1333 return NULL; 1334 } 1335 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1336 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1337 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), 1338 &thnorm, TH_HEADER_LENGTH); 1339 grp->saved_xid2 = NULL; 1340 priv->xid = grp->xid; 1341 priv->mpcg = grp; 1342 return grp; 1343 } 1344 1345 /* 1346 * The MPC Group Station FSM 1347 */ 1348 1349 /* 1350 * MPC Group Station FSM actions 1351 * CTCM_PROTO_MPC only 1352 */ 1353 1354 /** 1355 * NOP action for statemachines 1356 */ 1357 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1358 { 1359 } 1360 1361 /* 1362 * invoked when the device transitions to dev_stopped 1363 * MPC will stop each individual channel if a single XID failure 1364 * occurs, or will intitiate all channels be stopped if a GROUP 1365 * level failure occurs. 1366 */ 1367 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1368 { 1369 struct net_device *dev = arg; 1370 struct ctcm_priv *priv; 1371 struct mpc_group *grp; 1372 int rc = 0; 1373 struct channel *wch, *rch; 1374 1375 BUG_ON(dev == NULL); 1376 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1377 1378 priv = dev->ml_priv; 1379 grp = priv->mpcg; 1380 grp->flow_off_called = 0; 1381 fsm_deltimer(&grp->timer); 1382 if (grp->channels_terminating) 1383 return; 1384 1385 grp->channels_terminating = 1; 1386 grp->saved_state = fsm_getstate(grp->fsm); 1387 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1388 if (grp->saved_state > MPCG_STATE_XID7INITF) 1389 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1390 "%s(%s): MPC GROUP INOPERATIVE", 1391 CTCM_FUNTAIL, dev->name); 1392 if ((grp->saved_state != MPCG_STATE_RESET) || 1393 /* dealloc_channel has been called */ 1394 (grp->port_persist == 0)) 1395 fsm_deltimer(&priv->restart_timer); 1396 1397 wch = priv->channel[WRITE]; 1398 rch = priv->channel[READ]; 1399 1400 switch (grp->saved_state) { 1401 case MPCG_STATE_RESET: 1402 case MPCG_STATE_INOP: 1403 case MPCG_STATE_XID2INITW: 1404 case MPCG_STATE_XID0IOWAIT: 1405 case MPCG_STATE_XID2INITX: 1406 case MPCG_STATE_XID7INITW: 1407 case MPCG_STATE_XID7INITX: 1408 case MPCG_STATE_XID0IOWAIX: 1409 case MPCG_STATE_XID7INITI: 1410 case MPCG_STATE_XID7INITZ: 1411 case MPCG_STATE_XID7INITF: 1412 break; 1413 case MPCG_STATE_FLOWC: 1414 case MPCG_STATE_READY: 1415 default: 1416 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1417 } 1418 1419 grp->xid2_tgnum = 0; 1420 grp->group_max_buflen = 0; /*min of all received */ 1421 grp->outstanding_xid2 = 0; 1422 grp->outstanding_xid7 = 0; 1423 grp->outstanding_xid7_p2 = 0; 1424 grp->saved_xid2 = NULL; 1425 grp->xidnogood = 0; 1426 grp->changed_side = 0; 1427 1428 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1429 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1430 grp->rcvd_xid_skb->len = 0; 1431 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1432 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm, 1433 TH_HEADER_LENGTH); 1434 1435 if (grp->send_qllc_disc == 1) { 1436 grp->send_qllc_disc = 0; 1437 rc = mpc_send_qllc_discontact(dev); 1438 } 1439 1440 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1441 /* This can result in INOP of VTAM PU due to halting of */ 1442 /* outstanding IO which causes a sense to be returned */ 1443 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1444 /* become unreachable without manual intervention */ 1445 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1446 grp->alloc_called = 0; 1447 fsm_deltimer(&priv->restart_timer); 1448 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1449 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1450 if (grp->saved_state > MPCG_STATE_XID7INITF) 1451 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1452 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1453 CTCM_FUNTAIL, dev->name); 1454 } else { 1455 fsm_deltimer(&priv->restart_timer); 1456 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1457 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1458 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1459 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1460 CTCM_FUNTAIL, dev->name); 1461 } 1462 } 1463 1464 /** 1465 * Handle mpc group action timeout. 1466 * MPC Group Station FSM action 1467 * CTCM_PROTO_MPC only 1468 * 1469 * fi An instance of an mpc_group fsm. 1470 * event The event, just happened. 1471 * arg Generic pointer, casted from net_device * upon call. 1472 */ 1473 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1474 { 1475 struct net_device *dev = arg; 1476 struct ctcm_priv *priv; 1477 struct mpc_group *grp; 1478 struct channel *wch; 1479 struct channel *rch; 1480 1481 BUG_ON(dev == NULL); 1482 1483 priv = dev->ml_priv; 1484 grp = priv->mpcg; 1485 wch = priv->channel[WRITE]; 1486 rch = priv->channel[READ]; 1487 1488 switch (fsm_getstate(grp->fsm)) { 1489 case MPCG_STATE_XID2INITW: 1490 /* Unless there is outstanding IO on the */ 1491 /* channel just return and wait for ATTN */ 1492 /* interrupt to begin XID negotiations */ 1493 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1494 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1495 break; 1496 default: 1497 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1498 } 1499 1500 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1501 "%s: dev=%s exit", 1502 CTCM_FUNTAIL, dev->name); 1503 return; 1504 } 1505 1506 /* 1507 * MPC Group Station FSM action 1508 * CTCM_PROTO_MPC only 1509 */ 1510 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1511 { 1512 struct mpcg_info *mpcginfo = arg; 1513 struct channel *ch = mpcginfo->ch; 1514 struct net_device *dev; 1515 struct ctcm_priv *priv; 1516 struct mpc_group *grp; 1517 1518 if (ch) { 1519 dev = ch->netdev; 1520 if (dev) { 1521 priv = dev->ml_priv; 1522 if (priv) { 1523 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1524 "%s: %s: %s\n", 1525 CTCM_FUNTAIL, dev->name, ch->id); 1526 grp = priv->mpcg; 1527 grp->send_qllc_disc = 1; 1528 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1529 } 1530 } 1531 } 1532 1533 return; 1534 } 1535 1536 /* 1537 * MPC Group Station - not part of FSM 1538 * CTCM_PROTO_MPC only 1539 * called from add_channel in ctcm_main.c 1540 */ 1541 void mpc_action_send_discontact(unsigned long thischan) 1542 { 1543 int rc; 1544 struct channel *ch = (struct channel *)thischan; 1545 unsigned long saveflags = 0; 1546 1547 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1548 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1549 (unsigned long)ch, 0xff, 0); 1550 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1551 1552 if (rc != 0) { 1553 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1554 } 1555 1556 return; 1557 } 1558 1559 1560 /* 1561 * helper function of mpc FSM 1562 * CTCM_PROTO_MPC only 1563 * mpc_action_rcvd_xid7 1564 */ 1565 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1566 { 1567 struct channel *ch = mpcginfo->ch; 1568 struct net_device *dev = ch->netdev; 1569 struct ctcm_priv *priv = dev->ml_priv; 1570 struct mpc_group *grp = priv->mpcg; 1571 struct xid2 *xid = mpcginfo->xid; 1572 int rc = 0; 1573 __u64 our_id = 0; 1574 __u64 their_id = 0; 1575 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1576 1577 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1578 1579 if (xid == NULL) { 1580 rc = 1; 1581 /* XID REJECTED: xid == NULL */ 1582 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1583 "%s(%s): xid = NULL", 1584 CTCM_FUNTAIL, ch->id); 1585 goto done; 1586 } 1587 1588 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1589 1590 /*the received direction should be the opposite of ours */ 1591 if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE : 1592 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1593 rc = 2; 1594 /* XID REJECTED: r/w channel pairing mismatch */ 1595 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1596 "%s(%s): r/w channel pairing mismatch", 1597 CTCM_FUNTAIL, ch->id); 1598 goto done; 1599 } 1600 1601 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1602 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1603 grp->group_max_buflen, xid->xid2_buf_len); 1604 1605 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1606 xid->xid2_buf_len - len) 1607 grp->group_max_buflen = xid->xid2_buf_len - len; 1608 } 1609 1610 if (grp->saved_xid2 == NULL) { 1611 grp->saved_xid2 = 1612 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1613 1614 memcpy(skb_put(grp->rcvd_xid_skb, 1615 XID2_LENGTH), xid, XID2_LENGTH); 1616 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1617 1618 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1619 grp->rcvd_xid_skb->len = 0; 1620 1621 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1622 our_id = (__u64)priv->xid->xid2_adj_id; 1623 our_id = our_id << 32; 1624 our_id = our_id + priv->xid->xid2_sender_id; 1625 their_id = (__u64)xid->xid2_adj_id; 1626 their_id = their_id << 32; 1627 their_id = their_id + xid->xid2_sender_id; 1628 /* lower id assume the xside role */ 1629 if (our_id < their_id) { 1630 grp->roll = XSIDE; 1631 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1632 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1633 CTCM_FUNTAIL, ch->id); 1634 } else { 1635 grp->roll = YSIDE; 1636 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1637 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1638 CTCM_FUNTAIL, ch->id); 1639 } 1640 1641 } else { 1642 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1643 rc = 3; 1644 /* XID REJECTED: xid flag byte4 mismatch */ 1645 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1646 "%s(%s): xid flag byte4 mismatch", 1647 CTCM_FUNTAIL, ch->id); 1648 } 1649 if (xid->xid2_flag2 == 0x40) { 1650 rc = 4; 1651 /* XID REJECTED - xid NOGOOD */ 1652 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1653 "%s(%s): xid NOGOOD", 1654 CTCM_FUNTAIL, ch->id); 1655 } 1656 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1657 rc = 5; 1658 /* XID REJECTED - Adjacent Station ID Mismatch */ 1659 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1660 "%s(%s): Adjacent Station ID Mismatch", 1661 CTCM_FUNTAIL, ch->id); 1662 } 1663 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1664 rc = 6; 1665 /* XID REJECTED - Sender Address Mismatch */ 1666 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1667 "%s(%s): Sender Address Mismatch", 1668 CTCM_FUNTAIL, ch->id); 1669 } 1670 } 1671 done: 1672 if (rc) { 1673 dev_warn(&dev->dev, 1674 "The XID used in the MPC protocol is not valid, " 1675 "rc = %d\n", rc); 1676 priv->xid->xid2_flag2 = 0x40; 1677 grp->saved_xid2->xid2_flag2 = 0x40; 1678 } 1679 1680 return rc; 1681 } 1682 1683 /* 1684 * MPC Group Station FSM action 1685 * CTCM_PROTO_MPC only 1686 */ 1687 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1688 { 1689 struct channel *ch = arg; 1690 int rc = 0; 1691 int gotlock = 0; 1692 unsigned long saveflags = 0; /* avoids compiler warning with 1693 spin_unlock_irqrestore */ 1694 1695 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1696 __func__, smp_processor_id(), ch, ch->id); 1697 1698 if (ctcm_checkalloc_buffer(ch)) 1699 goto done; 1700 1701 /* 1702 * skb data-buffer referencing: 1703 */ 1704 ch->trans_skb->data = ch->trans_skb_data; 1705 skb_reset_tail_pointer(ch->trans_skb); 1706 ch->trans_skb->len = 0; 1707 /* result of the previous 3 statements is NOT always 1708 * already set after ctcm_checkalloc_buffer 1709 * because of possible reuse of the trans_skb 1710 */ 1711 memset(ch->trans_skb->data, 0, 16); 1712 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1713 /* check is main purpose here: */ 1714 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1715 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1716 /* check is main purpose here: */ 1717 skb_put(ch->trans_skb, XID2_LENGTH); 1718 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1719 /* cleanup back to startpoint */ 1720 ch->trans_skb->data = ch->trans_skb_data; 1721 skb_reset_tail_pointer(ch->trans_skb); 1722 ch->trans_skb->len = 0; 1723 1724 /* non-checking rewrite of above skb data-buffer referencing: */ 1725 /* 1726 memset(ch->trans_skb->data, 0, 16); 1727 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1728 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1729 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1730 */ 1731 1732 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1733 ch->ccw[8].count = 0; 1734 ch->ccw[8].cda = 0x00; 1735 1736 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1737 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1738 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1739 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1740 1741 if (side == XSIDE) { 1742 /* mpc_action_xside_xid */ 1743 if (ch->xid_th == NULL) 1744 goto done; 1745 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 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->xid_th); 1749 1750 if (ch->xid == NULL) 1751 goto done; 1752 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1753 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1754 ch->ccw[10].count = XID2_LENGTH; 1755 ch->ccw[10].cda = virt_to_phys(ch->xid); 1756 1757 ch->ccw[11].cmd_code = CCW_CMD_READ; 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->rcvd_xid_th); 1761 1762 ch->ccw[12].cmd_code = CCW_CMD_READ; 1763 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1764 ch->ccw[12].count = XID2_LENGTH; 1765 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1766 1767 ch->ccw[13].cmd_code = CCW_CMD_READ; 1768 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1769 1770 } else { /* side == YSIDE : mpc_action_yside_xid */ 1771 ch->ccw[9].cmd_code = CCW_CMD_READ; 1772 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1773 ch->ccw[9].count = TH_HEADER_LENGTH; 1774 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1775 1776 ch->ccw[10].cmd_code = CCW_CMD_READ; 1777 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1778 ch->ccw[10].count = XID2_LENGTH; 1779 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1780 1781 if (ch->xid_th == NULL) 1782 goto done; 1783 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1784 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1785 ch->ccw[11].count = TH_HEADER_LENGTH; 1786 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1787 1788 if (ch->xid == NULL) 1789 goto done; 1790 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1791 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1792 ch->ccw[12].count = XID2_LENGTH; 1793 ch->ccw[12].cda = virt_to_phys(ch->xid); 1794 1795 if (ch->xid_id == NULL) 1796 goto done; 1797 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1798 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1799 1800 } 1801 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1802 ch->ccw[13].count = 4; 1803 1804 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1805 ch->ccw[14].flags = CCW_FLAG_SLI; 1806 ch->ccw[14].count = 0; 1807 ch->ccw[14].cda = 0; 1808 1809 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1810 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1811 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1812 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1813 1814 if (!in_irq()) { 1815 /* Such conditional locking is a known problem for 1816 * sparse because its static undeterministic. 1817 * Warnings should be ignored here. */ 1818 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1819 gotlock = 1; 1820 } 1821 1822 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1823 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1824 (unsigned long)ch, 0xff, 0); 1825 1826 if (gotlock) /* see remark above about conditional locking */ 1827 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1828 1829 if (rc != 0) { 1830 ctcm_ccw_check_rc(ch, rc, 1831 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1832 } 1833 1834 done: 1835 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1836 __func__, ch, ch->id); 1837 return; 1838 1839 } 1840 1841 /* 1842 * MPC Group Station FSM action 1843 * CTCM_PROTO_MPC only 1844 */ 1845 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1846 { 1847 mpc_action_side_xid(fsm, arg, XSIDE); 1848 } 1849 1850 /* 1851 * MPC Group Station FSM action 1852 * CTCM_PROTO_MPC only 1853 */ 1854 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1855 { 1856 mpc_action_side_xid(fsm, arg, YSIDE); 1857 } 1858 1859 /* 1860 * MPC Group Station FSM action 1861 * CTCM_PROTO_MPC only 1862 */ 1863 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1864 { 1865 struct channel *ch = arg; 1866 struct net_device *dev = ch->netdev; 1867 struct ctcm_priv *priv = dev->ml_priv; 1868 struct mpc_group *grp = priv->mpcg; 1869 1870 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1871 __func__, smp_processor_id(), ch, ch->id); 1872 1873 if (ch->xid == NULL) { 1874 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1875 "%s(%s): ch->xid == NULL", 1876 CTCM_FUNTAIL, dev->name); 1877 return; 1878 } 1879 1880 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1881 1882 ch->xid->xid2_option = XID2_0; 1883 1884 switch (fsm_getstate(grp->fsm)) { 1885 case MPCG_STATE_XID2INITW: 1886 case MPCG_STATE_XID2INITX: 1887 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1888 break; 1889 case MPCG_STATE_XID0IOWAIT: 1890 case MPCG_STATE_XID0IOWAIX: 1891 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1892 break; 1893 } 1894 1895 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1896 1897 return; 1898 } 1899 1900 /* 1901 * MPC Group Station FSM action 1902 * CTCM_PROTO_MPC only 1903 */ 1904 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1905 { 1906 struct net_device *dev = arg; 1907 struct ctcm_priv *priv = dev->ml_priv; 1908 struct mpc_group *grp = NULL; 1909 int direction; 1910 int send = 0; 1911 1912 if (priv) 1913 grp = priv->mpcg; 1914 if (grp == NULL) 1915 return; 1916 1917 for (direction = READ; direction <= WRITE; direction++) { 1918 struct channel *ch = priv->channel[direction]; 1919 struct xid2 *thisxid = ch->xid; 1920 ch->xid_skb->data = ch->xid_skb_data; 1921 skb_reset_tail_pointer(ch->xid_skb); 1922 ch->xid_skb->len = 0; 1923 thisxid->xid2_option = XID2_7; 1924 send = 0; 1925 1926 /* xid7 phase 1 */ 1927 if (grp->outstanding_xid7_p2 > 0) { 1928 if (grp->roll == YSIDE) { 1929 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1930 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1931 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1932 memcpy(skb_put(ch->xid_skb, 1933 TH_HEADER_LENGTH), 1934 &thdummy, TH_HEADER_LENGTH); 1935 send = 1; 1936 } 1937 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1938 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1939 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1940 memcpy(skb_put(ch->xid_skb, 1941 TH_HEADER_LENGTH), 1942 &thnorm, TH_HEADER_LENGTH); 1943 send = 1; 1944 } 1945 } else { 1946 /* xid7 phase 2 */ 1947 if (grp->roll == YSIDE) { 1948 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1949 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1950 memcpy(skb_put(ch->xid_skb, 1951 TH_HEADER_LENGTH), 1952 &thnorm, TH_HEADER_LENGTH); 1953 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1954 send = 1; 1955 } 1956 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1957 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1958 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1959 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH), 1960 &thdummy, TH_HEADER_LENGTH); 1961 send = 1; 1962 } 1963 } 1964 1965 if (send) 1966 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1967 } 1968 1969 return; 1970 } 1971 1972 /* 1973 * MPC Group Station FSM action 1974 * CTCM_PROTO_MPC only 1975 */ 1976 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1977 { 1978 1979 struct mpcg_info *mpcginfo = arg; 1980 struct channel *ch = mpcginfo->ch; 1981 struct net_device *dev = ch->netdev; 1982 struct ctcm_priv *priv = dev->ml_priv; 1983 struct mpc_group *grp = priv->mpcg; 1984 1985 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1986 __func__, ch->id, grp->outstanding_xid2, 1987 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1988 1989 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1990 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1991 1992 grp->outstanding_xid2--; 1993 grp->outstanding_xid7++; 1994 grp->outstanding_xid7_p2++; 1995 1996 /* must change state before validating xid to */ 1997 /* properly handle interim interrupts received*/ 1998 switch (fsm_getstate(grp->fsm)) { 1999 case MPCG_STATE_XID2INITW: 2000 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 2001 mpc_validate_xid(mpcginfo); 2002 break; 2003 case MPCG_STATE_XID0IOWAIT: 2004 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 2005 mpc_validate_xid(mpcginfo); 2006 break; 2007 case MPCG_STATE_XID2INITX: 2008 if (grp->outstanding_xid2 == 0) { 2009 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 2010 mpc_validate_xid(mpcginfo); 2011 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2012 } 2013 break; 2014 case MPCG_STATE_XID0IOWAIX: 2015 if (grp->outstanding_xid2 == 0) { 2016 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 2017 mpc_validate_xid(mpcginfo); 2018 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2019 } 2020 break; 2021 } 2022 kfree(mpcginfo); 2023 2024 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 2025 __func__, ch->id, grp->outstanding_xid2, 2026 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2027 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2028 __func__, ch->id, 2029 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2030 return; 2031 2032 } 2033 2034 2035 /* 2036 * MPC Group Station FSM action 2037 * CTCM_PROTO_MPC only 2038 */ 2039 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2040 { 2041 struct mpcg_info *mpcginfo = arg; 2042 struct channel *ch = mpcginfo->ch; 2043 struct net_device *dev = ch->netdev; 2044 struct ctcm_priv *priv = dev->ml_priv; 2045 struct mpc_group *grp = priv->mpcg; 2046 2047 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2048 __func__, smp_processor_id(), ch, ch->id); 2049 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2050 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2051 2052 grp->outstanding_xid7--; 2053 ch->xid_skb->data = ch->xid_skb_data; 2054 skb_reset_tail_pointer(ch->xid_skb); 2055 ch->xid_skb->len = 0; 2056 2057 switch (fsm_getstate(grp->fsm)) { 2058 case MPCG_STATE_XID7INITI: 2059 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2060 mpc_validate_xid(mpcginfo); 2061 break; 2062 case MPCG_STATE_XID7INITW: 2063 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2064 mpc_validate_xid(mpcginfo); 2065 break; 2066 case MPCG_STATE_XID7INITZ: 2067 case MPCG_STATE_XID7INITX: 2068 if (grp->outstanding_xid7 == 0) { 2069 if (grp->outstanding_xid7_p2 > 0) { 2070 grp->outstanding_xid7 = 2071 grp->outstanding_xid7_p2; 2072 grp->outstanding_xid7_p2 = 0; 2073 } else 2074 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2075 2076 mpc_validate_xid(mpcginfo); 2077 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2078 break; 2079 } 2080 mpc_validate_xid(mpcginfo); 2081 break; 2082 } 2083 kfree(mpcginfo); 2084 return; 2085 } 2086 2087 /* 2088 * mpc_action helper of an MPC Group Station FSM action 2089 * CTCM_PROTO_MPC only 2090 */ 2091 static int mpc_send_qllc_discontact(struct net_device *dev) 2092 { 2093 __u32 new_len = 0; 2094 struct sk_buff *skb; 2095 struct qllc *qllcptr; 2096 struct ctcm_priv *priv = dev->ml_priv; 2097 struct mpc_group *grp = priv->mpcg; 2098 2099 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2100 __func__, mpcg_state_names[grp->saved_state]); 2101 2102 switch (grp->saved_state) { 2103 /* 2104 * establish conn callback function is 2105 * preferred method to report failure 2106 */ 2107 case MPCG_STATE_XID0IOWAIT: 2108 case MPCG_STATE_XID0IOWAIX: 2109 case MPCG_STATE_XID7INITI: 2110 case MPCG_STATE_XID7INITZ: 2111 case MPCG_STATE_XID2INITW: 2112 case MPCG_STATE_XID2INITX: 2113 case MPCG_STATE_XID7INITW: 2114 case MPCG_STATE_XID7INITX: 2115 if (grp->estconnfunc) { 2116 grp->estconnfunc(grp->port_num, -1, 0); 2117 grp->estconnfunc = NULL; 2118 break; 2119 } 2120 case MPCG_STATE_FLOWC: 2121 case MPCG_STATE_READY: 2122 grp->send_qllc_disc = 2; 2123 new_len = sizeof(struct qllc); 2124 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2125 if (qllcptr == NULL) { 2126 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2127 "%s(%s): qllcptr allocation error", 2128 CTCM_FUNTAIL, dev->name); 2129 return -ENOMEM; 2130 } 2131 2132 qllcptr->qllc_address = 0xcc; 2133 qllcptr->qllc_commands = 0x03; 2134 2135 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2136 2137 if (skb == NULL) { 2138 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2139 "%s(%s): skb allocation error", 2140 CTCM_FUNTAIL, dev->name); 2141 priv->stats.rx_dropped++; 2142 kfree(qllcptr); 2143 return -ENOMEM; 2144 } 2145 2146 memcpy(skb_put(skb, new_len), qllcptr, new_len); 2147 kfree(qllcptr); 2148 2149 if (skb_headroom(skb) < 4) { 2150 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2151 "%s(%s): skb_headroom error", 2152 CTCM_FUNTAIL, dev->name); 2153 dev_kfree_skb_any(skb); 2154 return -ENOMEM; 2155 } 2156 2157 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq; 2158 priv->channel[READ]->pdu_seq++; 2159 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2160 __func__, priv->channel[READ]->pdu_seq); 2161 2162 /* receipt of CC03 resets anticipated sequence number on 2163 receiving side */ 2164 priv->channel[READ]->pdu_seq = 0x00; 2165 skb_reset_mac_header(skb); 2166 skb->dev = dev; 2167 skb->protocol = htons(ETH_P_SNAP); 2168 skb->ip_summed = CHECKSUM_UNNECESSARY; 2169 2170 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2171 2172 netif_rx(skb); 2173 break; 2174 default: 2175 break; 2176 2177 } 2178 2179 return 0; 2180 } 2181 /* --- This is the END my friend --- */ 2182 2183