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 "cu3088.h" 57 #include "ctcm_mpc.h" 58 #include "ctcm_main.h" 59 #include "ctcm_fsms.h" 60 61 static const struct xid2 init_xid = { 62 .xid2_type_id = XID_FM2, 63 .xid2_len = 0x45, 64 .xid2_adj_id = 0, 65 .xid2_rlen = 0x31, 66 .xid2_resv1 = 0, 67 .xid2_flag1 = 0, 68 .xid2_fmtt = 0, 69 .xid2_flag4 = 0x80, 70 .xid2_resv2 = 0, 71 .xid2_tgnum = 0, 72 .xid2_sender_id = 0, 73 .xid2_flag2 = 0, 74 .xid2_option = XID2_0, 75 .xid2_resv3 = "\x00", 76 .xid2_resv4 = 0, 77 .xid2_dlc_type = XID2_READ_SIDE, 78 .xid2_resv5 = 0, 79 .xid2_mpc_flag = 0, 80 .xid2_resv6 = 0, 81 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), 82 }; 83 84 static const struct th_header thnorm = { 85 .th_seg = 0x00, 86 .th_ch_flag = TH_IS_XID, 87 .th_blk_flag = TH_DATA_IS_XID, 88 .th_is_xid = 0x01, 89 .th_seq_num = 0x00000000, 90 }; 91 92 static const struct th_header thdummy = { 93 .th_seg = 0x00, 94 .th_ch_flag = 0x00, 95 .th_blk_flag = TH_DATA_IS_XID, 96 .th_is_xid = 0x01, 97 .th_seq_num = 0x00000000, 98 }; 99 100 /* 101 * Definition of one MPC group 102 */ 103 104 /* 105 * Compatibility macros for busy handling 106 * of network devices. 107 */ 108 109 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 110 111 /* 112 * MPC Group state machine actions (static prototypes) 113 */ 114 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 115 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 116 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 117 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 118 static int mpc_validate_xid(struct mpcg_info *mpcginfo); 119 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 120 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 121 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 122 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 123 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 124 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 125 126 #ifdef DEBUGDATA 127 /*-------------------------------------------------------------------* 128 * Dump buffer format * 129 * * 130 *--------------------------------------------------------------------*/ 131 void ctcmpc_dumpit(char *buf, int len) 132 { 133 __u32 ct, sw, rm, dup; 134 char *ptr, *rptr; 135 char tbuf[82], tdup[82]; 136 #if (UTS_MACHINE == s390x) 137 char addr[22]; 138 #else 139 char addr[12]; 140 #endif 141 char boff[12]; 142 char bhex[82], duphex[82]; 143 char basc[40]; 144 145 sw = 0; 146 rptr = ptr = buf; 147 rm = 16; 148 duphex[0] = 0x00; 149 dup = 0; 150 151 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 152 if (sw == 0) { 153 #if (UTS_MACHINE == s390x) 154 sprintf(addr, "%16.16lx", (__u64)rptr); 155 #else 156 sprintf(addr, "%8.8X", (__u32)rptr); 157 #endif 158 159 sprintf(boff, "%4.4X", (__u32)ct); 160 bhex[0] = '\0'; 161 basc[0] = '\0'; 162 } 163 if ((sw == 4) || (sw == 12)) 164 strcat(bhex, " "); 165 if (sw == 8) 166 strcat(bhex, " "); 167 168 #if (UTS_MACHINE == s390x) 169 sprintf(tbuf, "%2.2lX", (__u64)*ptr); 170 #else 171 sprintf(tbuf, "%2.2X", (__u32)*ptr); 172 #endif 173 174 tbuf[2] = '\0'; 175 strcat(bhex, tbuf); 176 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 177 basc[sw] = *ptr; 178 else 179 basc[sw] = '.'; 180 181 basc[sw+1] = '\0'; 182 sw++; 183 rm--; 184 if (sw != 16) 185 continue; 186 if ((strcmp(duphex, bhex)) != 0) { 187 if (dup != 0) { 188 sprintf(tdup, 189 "Duplicate as above to %s", addr); 190 ctcm_pr_debug(" --- %s ---\n", 191 tdup); 192 } 193 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 194 addr, boff, bhex, basc); 195 dup = 0; 196 strcpy(duphex, bhex); 197 } else 198 dup++; 199 200 sw = 0; 201 rm = 16; 202 } /* endfor */ 203 204 if (sw != 0) { 205 for ( ; rm > 0; rm--, sw++) { 206 if ((sw == 4) || (sw == 12)) 207 strcat(bhex, " "); 208 if (sw == 8) 209 strcat(bhex, " "); 210 strcat(bhex, " "); 211 strcat(basc, " "); 212 } 213 if (dup != 0) { 214 sprintf(tdup, "Duplicate as above to %s", addr); 215 ctcm_pr_debug(" --- %s ---\n", tdup); 216 } 217 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 218 addr, boff, bhex, basc); 219 } else { 220 if (dup >= 1) { 221 sprintf(tdup, "Duplicate as above to %s", addr); 222 ctcm_pr_debug(" --- %s ---\n", tdup); 223 } 224 if (dup != 0) { 225 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 226 addr, boff, bhex, basc); 227 } 228 } 229 230 return; 231 232 } /* end of ctcmpc_dumpit */ 233 #endif 234 235 #ifdef DEBUGDATA 236 /* 237 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 238 * 239 * skb The sk_buff to dump. 240 * offset Offset relative to skb-data, where to start the dump. 241 */ 242 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 243 { 244 __u8 *p = skb->data; 245 struct th_header *header; 246 struct pdu *pheader; 247 int bl = skb->len; 248 int i; 249 250 if (p == NULL) 251 return; 252 253 p += offset; 254 header = (struct th_header *)p; 255 256 ctcm_pr_debug("dump:\n"); 257 ctcm_pr_debug("skb len=%d \n", skb->len); 258 if (skb->len > 2) { 259 switch (header->th_ch_flag) { 260 case TH_HAS_PDU: 261 break; 262 case 0x00: 263 case TH_IS_XID: 264 if ((header->th_blk_flag == TH_DATA_IS_XID) && 265 (header->th_is_xid == 0x01)) 266 goto dumpth; 267 case TH_SWEEP_REQ: 268 goto dumpth; 269 case TH_SWEEP_RESP: 270 goto dumpth; 271 default: 272 break; 273 } 274 275 pheader = (struct pdu *)p; 276 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 277 pheader->pdu_offset, pheader->pdu_offset); 278 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 279 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 280 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 281 goto dumpdata; 282 283 dumpth: 284 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 285 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 286 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 287 ctcm_pr_debug("th->type : %s\n", 288 (header->th_is_xid) ? "DATA" : "XID"); 289 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 290 291 } 292 dumpdata: 293 if (bl > 32) 294 bl = 32; 295 ctcm_pr_debug("data: "); 296 for (i = 0; i < bl; i++) 297 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 298 ctcm_pr_debug("\n"); 299 } 300 #endif 301 302 static struct net_device *ctcmpc_get_dev(int port_num) 303 { 304 char device[20]; 305 struct net_device *dev; 306 struct ctcm_priv *priv; 307 308 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 309 310 dev = __dev_get_by_name(&init_net, device); 311 312 if (dev == NULL) { 313 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 314 "%s: Device not found by name: %s", 315 CTCM_FUNTAIL, device); 316 return NULL; 317 } 318 priv = dev->ml_priv; 319 if (priv == NULL) { 320 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 321 "%s(%s): dev->ml_priv is NULL", 322 CTCM_FUNTAIL, device); 323 return NULL; 324 } 325 if (priv->mpcg == NULL) { 326 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 327 "%s(%s): priv->mpcg is NULL", 328 CTCM_FUNTAIL, device); 329 return NULL; 330 } 331 return dev; 332 } 333 334 /* 335 * ctc_mpc_alloc_channel 336 * (exported interface) 337 * 338 * Device Initialization : 339 * ACTPATH driven IO operations 340 */ 341 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 342 { 343 struct net_device *dev; 344 struct mpc_group *grp; 345 struct ctcm_priv *priv; 346 347 dev = ctcmpc_get_dev(port_num); 348 if (dev == NULL) 349 return 1; 350 priv = dev->ml_priv; 351 grp = priv->mpcg; 352 353 grp->allochanfunc = callback; 354 grp->port_num = port_num; 355 grp->port_persist = 1; 356 357 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 358 "%s(%s): state=%s", 359 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 360 361 switch (fsm_getstate(grp->fsm)) { 362 case MPCG_STATE_INOP: 363 /* Group is in the process of terminating */ 364 grp->alloc_called = 1; 365 break; 366 case MPCG_STATE_RESET: 367 /* MPC Group will transition to state */ 368 /* MPCG_STATE_XID2INITW iff the minimum number */ 369 /* of 1 read and 1 write channel have successfully*/ 370 /* activated */ 371 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 372 if (callback) 373 grp->send_qllc_disc = 1; 374 case MPCG_STATE_XID0IOWAIT: 375 fsm_deltimer(&grp->timer); 376 grp->outstanding_xid2 = 0; 377 grp->outstanding_xid7 = 0; 378 grp->outstanding_xid7_p2 = 0; 379 grp->saved_xid2 = NULL; 380 if (callback) 381 ctcm_open(dev); 382 fsm_event(priv->fsm, DEV_EVENT_START, dev); 383 break; 384 case MPCG_STATE_READY: 385 /* XID exchanges completed after PORT was activated */ 386 /* Link station already active */ 387 /* Maybe timing issue...retry callback */ 388 grp->allocchan_callback_retries++; 389 if (grp->allocchan_callback_retries < 4) { 390 if (grp->allochanfunc) 391 grp->allochanfunc(grp->port_num, 392 grp->group_max_buflen); 393 } else { 394 /* there are problems...bail out */ 395 /* there may be a state mismatch so restart */ 396 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 397 grp->allocchan_callback_retries = 0; 398 } 399 break; 400 } 401 402 return 0; 403 } 404 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 405 406 /* 407 * ctc_mpc_establish_connectivity 408 * (exported interface) 409 */ 410 void ctc_mpc_establish_connectivity(int port_num, 411 void (*callback)(int, int, int)) 412 { 413 struct net_device *dev; 414 struct mpc_group *grp; 415 struct ctcm_priv *priv; 416 struct channel *rch, *wch; 417 418 dev = ctcmpc_get_dev(port_num); 419 if (dev == NULL) 420 return; 421 priv = dev->ml_priv; 422 grp = priv->mpcg; 423 rch = priv->channel[READ]; 424 wch = priv->channel[WRITE]; 425 426 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 427 "%s(%s): state=%s", 428 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 429 430 grp->estconnfunc = callback; 431 grp->port_num = port_num; 432 433 switch (fsm_getstate(grp->fsm)) { 434 case MPCG_STATE_READY: 435 /* XID exchanges completed after PORT was activated */ 436 /* Link station already active */ 437 /* Maybe timing issue...retry callback */ 438 fsm_deltimer(&grp->timer); 439 grp->estconn_callback_retries++; 440 if (grp->estconn_callback_retries < 4) { 441 if (grp->estconnfunc) { 442 grp->estconnfunc(grp->port_num, 0, 443 grp->group_max_buflen); 444 grp->estconnfunc = NULL; 445 } 446 } else { 447 /* there are problems...bail out */ 448 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 449 grp->estconn_callback_retries = 0; 450 } 451 break; 452 case MPCG_STATE_INOP: 453 case MPCG_STATE_RESET: 454 /* MPC Group is not ready to start XID - min num of */ 455 /* 1 read and 1 write channel have not been acquired*/ 456 457 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 458 "%s(%s): REJECTED - inactive channels", 459 CTCM_FUNTAIL, dev->name); 460 if (grp->estconnfunc) { 461 grp->estconnfunc(grp->port_num, -1, 0); 462 grp->estconnfunc = NULL; 463 } 464 break; 465 case MPCG_STATE_XID2INITW: 466 /* alloc channel was called but no XID exchange */ 467 /* has occurred. initiate xside XID exchange */ 468 /* make sure yside XID0 processing has not started */ 469 470 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 471 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 472 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 473 "%s(%s): ABORT - PASSIVE XID", 474 CTCM_FUNTAIL, dev->name); 475 break; 476 } 477 grp->send_qllc_disc = 1; 478 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 479 fsm_deltimer(&grp->timer); 480 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 481 MPCG_EVENT_TIMER, dev); 482 grp->outstanding_xid7 = 0; 483 grp->outstanding_xid7_p2 = 0; 484 grp->saved_xid2 = NULL; 485 if ((rch->in_mpcgroup) && 486 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 487 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 488 else { 489 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 490 "%s(%s): RX-%s not ready for ACTIVE XID0", 491 CTCM_FUNTAIL, dev->name, rch->id); 492 if (grp->estconnfunc) { 493 grp->estconnfunc(grp->port_num, -1, 0); 494 grp->estconnfunc = NULL; 495 } 496 fsm_deltimer(&grp->timer); 497 goto done; 498 } 499 if ((wch->in_mpcgroup) && 500 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 501 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 502 else { 503 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 504 "%s(%s): WX-%s not ready for ACTIVE XID0", 505 CTCM_FUNTAIL, dev->name, wch->id); 506 if (grp->estconnfunc) { 507 grp->estconnfunc(grp->port_num, -1, 0); 508 grp->estconnfunc = NULL; 509 } 510 fsm_deltimer(&grp->timer); 511 goto done; 512 } 513 break; 514 case MPCG_STATE_XID0IOWAIT: 515 /* already in active XID negotiations */ 516 default: 517 break; 518 } 519 520 done: 521 CTCM_PR_DEBUG("Exit %s()\n", __func__); 522 return; 523 } 524 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 525 526 /* 527 * ctc_mpc_dealloc_ch 528 * (exported interface) 529 */ 530 void ctc_mpc_dealloc_ch(int port_num) 531 { 532 struct net_device *dev; 533 struct ctcm_priv *priv; 534 struct mpc_group *grp; 535 536 dev = ctcmpc_get_dev(port_num); 537 if (dev == NULL) 538 return; 539 priv = dev->ml_priv; 540 grp = priv->mpcg; 541 542 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 543 "%s: %s: refcount = %d\n", 544 CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt)); 545 546 fsm_deltimer(&priv->restart_timer); 547 grp->channels_terminating = 0; 548 fsm_deltimer(&grp->timer); 549 grp->allochanfunc = NULL; 550 grp->estconnfunc = NULL; 551 grp->port_persist = 0; 552 grp->send_qllc_disc = 0; 553 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 554 555 ctcm_close(dev); 556 return; 557 } 558 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 559 560 /* 561 * ctc_mpc_flow_control 562 * (exported interface) 563 */ 564 void ctc_mpc_flow_control(int port_num, int flowc) 565 { 566 struct ctcm_priv *priv; 567 struct mpc_group *grp; 568 struct net_device *dev; 569 struct channel *rch; 570 int mpcg_state; 571 572 dev = ctcmpc_get_dev(port_num); 573 if (dev == NULL) 574 return; 575 priv = dev->ml_priv; 576 grp = priv->mpcg; 577 578 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 579 "%s: %s: flowc = %d", 580 CTCM_FUNTAIL, dev->name, flowc); 581 582 rch = priv->channel[READ]; 583 584 mpcg_state = fsm_getstate(grp->fsm); 585 switch (flowc) { 586 case 1: 587 if (mpcg_state == MPCG_STATE_FLOWC) 588 break; 589 if (mpcg_state == MPCG_STATE_READY) { 590 if (grp->flow_off_called == 1) 591 grp->flow_off_called = 0; 592 else 593 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 594 break; 595 } 596 break; 597 case 0: 598 if (mpcg_state == MPCG_STATE_FLOWC) { 599 fsm_newstate(grp->fsm, MPCG_STATE_READY); 600 /* ensure any data that has accumulated */ 601 /* on the io_queue will now be sen t */ 602 tasklet_schedule(&rch->ch_tasklet); 603 } 604 /* possible race condition */ 605 if (mpcg_state == MPCG_STATE_READY) { 606 grp->flow_off_called = 1; 607 break; 608 } 609 break; 610 } 611 612 } 613 EXPORT_SYMBOL(ctc_mpc_flow_control); 614 615 static int mpc_send_qllc_discontact(struct net_device *); 616 617 /* 618 * helper function of ctcmpc_unpack_skb 619 */ 620 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 621 { 622 struct channel *rch = mpcginfo->ch; 623 struct net_device *dev = rch->netdev; 624 struct ctcm_priv *priv = dev->ml_priv; 625 struct mpc_group *grp = priv->mpcg; 626 struct channel *ch = priv->channel[WRITE]; 627 628 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 629 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 630 631 grp->sweep_rsp_pend_num--; 632 633 if ((grp->sweep_req_pend_num == 0) && 634 (grp->sweep_rsp_pend_num == 0)) { 635 fsm_deltimer(&ch->sweep_timer); 636 grp->in_sweep = 0; 637 rch->th_seq_num = 0x00; 638 ch->th_seq_num = 0x00; 639 ctcm_clear_busy_do(dev); 640 } 641 642 kfree(mpcginfo); 643 644 return; 645 646 } 647 648 /* 649 * helper function of mpc_rcvd_sweep_req 650 * which is a helper of ctcmpc_unpack_skb 651 */ 652 static void ctcmpc_send_sweep_resp(struct channel *rch) 653 { 654 struct net_device *dev = rch->netdev; 655 struct ctcm_priv *priv = dev->ml_priv; 656 struct mpc_group *grp = priv->mpcg; 657 int rc = 0; 658 struct th_sweep *header; 659 struct sk_buff *sweep_skb; 660 struct channel *ch = priv->channel[WRITE]; 661 662 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 663 664 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 665 if (sweep_skb == NULL) { 666 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 667 "%s(%s): sweep_skb allocation ERROR\n", 668 CTCM_FUNTAIL, rch->id); 669 rc = -ENOMEM; 670 goto done; 671 } 672 673 header = (struct th_sweep *) 674 kmalloc(sizeof(struct th_sweep), gfp_type()); 675 676 if (!header) { 677 dev_kfree_skb_any(sweep_skb); 678 rc = -ENOMEM; 679 goto done; 680 } 681 682 header->th.th_seg = 0x00 ; 683 header->th.th_ch_flag = TH_SWEEP_RESP; 684 header->th.th_blk_flag = 0x00; 685 header->th.th_is_xid = 0x00; 686 header->th.th_seq_num = 0x00; 687 header->sw.th_last_seq = ch->th_seq_num; 688 689 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 690 691 kfree(header); 692 693 dev->trans_start = jiffies; 694 skb_queue_tail(&ch->sweep_queue, sweep_skb); 695 696 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 697 698 return; 699 700 done: 701 grp->in_sweep = 0; 702 ctcm_clear_busy_do(dev); 703 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 704 705 return; 706 } 707 708 /* 709 * helper function of ctcmpc_unpack_skb 710 */ 711 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 712 { 713 struct channel *rch = mpcginfo->ch; 714 struct net_device *dev = rch->netdev; 715 struct ctcm_priv *priv = dev->ml_priv; 716 struct mpc_group *grp = priv->mpcg; 717 struct channel *ch = priv->channel[WRITE]; 718 719 if (do_debug) 720 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 721 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 722 723 if (grp->in_sweep == 0) { 724 grp->in_sweep = 1; 725 ctcm_test_and_set_busy(dev); 726 grp->sweep_req_pend_num = grp->active_channels[READ]; 727 grp->sweep_rsp_pend_num = grp->active_channels[READ]; 728 } 729 730 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 731 732 grp->sweep_req_pend_num--; 733 ctcmpc_send_sweep_resp(ch); 734 kfree(mpcginfo); 735 return; 736 } 737 738 /* 739 * MPC Group Station FSM definitions 740 */ 741 static const char *mpcg_event_names[] = { 742 [MPCG_EVENT_INOP] = "INOP Condition", 743 [MPCG_EVENT_DISCONC] = "Discontact Received", 744 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 745 [MPCG_EVENT_XID2] = "XID2 Received", 746 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 747 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 748 [MPCG_EVENT_TIMER] = "XID Setup Timer", 749 [MPCG_EVENT_DOIO] = "XID DoIO", 750 }; 751 752 static const char *mpcg_state_names[] = { 753 [MPCG_STATE_RESET] = "Reset", 754 [MPCG_STATE_INOP] = "INOP", 755 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 756 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 757 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 758 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 759 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 760 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 761 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 762 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 763 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 764 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 765 [MPCG_STATE_READY] = "READY", 766 }; 767 768 /* 769 * The MPC Group Station FSM 770 * 22 events 771 */ 772 static const fsm_node mpcg_fsm[] = { 773 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 774 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 775 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 776 777 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 778 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 779 780 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 781 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 782 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 783 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 784 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 785 786 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 787 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 788 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 789 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 790 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 791 792 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 793 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 794 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 795 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 796 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 797 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 798 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 799 800 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 801 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 802 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 803 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 804 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 805 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 806 807 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 808 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 809 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 810 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 811 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 812 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 813 814 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 815 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 816 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 817 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 818 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 819 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 820 821 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 822 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 823 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 824 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 825 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 826 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 827 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 828 829 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 830 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 831 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 832 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 833 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 834 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 835 836 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 837 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 838 }; 839 840 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 841 842 /* 843 * MPC Group Station FSM action 844 * CTCM_PROTO_MPC only 845 */ 846 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 847 { 848 struct net_device *dev = arg; 849 struct ctcm_priv *priv = dev->ml_priv; 850 struct mpc_group *grp = priv->mpcg; 851 852 if (grp == NULL) { 853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 854 "%s(%s): No MPC group", 855 CTCM_FUNTAIL, dev->name); 856 return; 857 } 858 859 fsm_deltimer(&grp->timer); 860 861 if (grp->saved_xid2->xid2_flag2 == 0x40) { 862 priv->xid->xid2_flag2 = 0x00; 863 if (grp->estconnfunc) { 864 grp->estconnfunc(grp->port_num, 1, 865 grp->group_max_buflen); 866 grp->estconnfunc = NULL; 867 } else if (grp->allochanfunc) 868 grp->send_qllc_disc = 1; 869 870 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 871 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 872 "%s(%s): fails", 873 CTCM_FUNTAIL, dev->name); 874 return; 875 } 876 877 grp->port_persist = 1; 878 grp->out_of_sequence = 0; 879 grp->estconn_called = 0; 880 881 tasklet_hi_schedule(&grp->mpc_tasklet2); 882 883 return; 884 } 885 886 /* 887 * helper of ctcm_init_netdevice 888 * CTCM_PROTO_MPC only 889 */ 890 void mpc_group_ready(unsigned long adev) 891 { 892 struct net_device *dev = (struct net_device *)adev; 893 struct ctcm_priv *priv = dev->ml_priv; 894 struct mpc_group *grp = priv->mpcg; 895 struct channel *ch = NULL; 896 897 if (grp == NULL) { 898 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 899 "%s(%s): No MPC group", 900 CTCM_FUNTAIL, dev->name); 901 return; 902 } 903 904 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 905 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 906 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 907 908 fsm_newstate(grp->fsm, MPCG_STATE_READY); 909 910 /* Put up a read on the channel */ 911 ch = priv->channel[READ]; 912 ch->pdu_seq = 0; 913 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 914 __func__, ch->pdu_seq); 915 916 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 917 /* Put the write channel in idle state */ 918 ch = priv->channel[WRITE]; 919 if (ch->collect_len > 0) { 920 spin_lock(&ch->collect_lock); 921 ctcm_purge_skb_queue(&ch->collect_queue); 922 ch->collect_len = 0; 923 spin_unlock(&ch->collect_lock); 924 } 925 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 926 ctcm_clear_busy(dev); 927 928 if (grp->estconnfunc) { 929 grp->estconnfunc(grp->port_num, 0, 930 grp->group_max_buflen); 931 grp->estconnfunc = NULL; 932 } else if (grp->allochanfunc) 933 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 934 935 grp->send_qllc_disc = 1; 936 grp->changed_side = 0; 937 938 return; 939 940 } 941 942 /* 943 * Increment the MPC Group Active Channel Counts 944 * helper of dev_action (called from channel fsm) 945 */ 946 void mpc_channel_action(struct channel *ch, int direction, int action) 947 { 948 struct net_device *dev = ch->netdev; 949 struct ctcm_priv *priv = dev->ml_priv; 950 struct mpc_group *grp = priv->mpcg; 951 952 if (grp == NULL) { 953 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 954 "%s(%s): No MPC group", 955 CTCM_FUNTAIL, dev->name); 956 return; 957 } 958 959 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 960 961 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 962 "%s: %i / Grp:%s total_channels=%i, active_channels: " 963 "read=%i, write=%i\n", __func__, action, 964 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 965 grp->active_channels[READ], grp->active_channels[WRITE]); 966 967 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 968 grp->num_channel_paths++; 969 grp->active_channels[direction]++; 970 grp->outstanding_xid2++; 971 ch->in_mpcgroup = 1; 972 973 if (ch->xid_skb != NULL) 974 dev_kfree_skb_any(ch->xid_skb); 975 976 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 977 GFP_ATOMIC | GFP_DMA); 978 if (ch->xid_skb == NULL) { 979 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 980 "%s(%s): Couldn't alloc ch xid_skb\n", 981 CTCM_FUNTAIL, dev->name); 982 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 983 return; 984 } 985 ch->xid_skb_data = ch->xid_skb->data; 986 ch->xid_th = (struct th_header *)ch->xid_skb->data; 987 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 988 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 989 skb_put(ch->xid_skb, XID2_LENGTH); 990 ch->xid_id = skb_tail_pointer(ch->xid_skb); 991 ch->xid_skb->data = ch->xid_skb_data; 992 skb_reset_tail_pointer(ch->xid_skb); 993 ch->xid_skb->len = 0; 994 995 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len), 996 grp->xid_skb->data, 997 grp->xid_skb->len); 998 999 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ) 1000 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 1001 1002 if (CHANNEL_DIRECTION(ch->flags) == WRITE) 1003 ch->xid->xid2_buf_len = 0x00; 1004 1005 ch->xid_skb->data = ch->xid_skb_data; 1006 skb_reset_tail_pointer(ch->xid_skb); 1007 ch->xid_skb->len = 0; 1008 1009 fsm_newstate(ch->fsm, CH_XID0_PENDING); 1010 1011 if ((grp->active_channels[READ] > 0) && 1012 (grp->active_channels[WRITE] > 0) && 1013 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 1014 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1015 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 1016 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1017 __func__, dev->name); 1018 } 1019 } else if ((action == MPC_CHANNEL_REMOVE) && 1020 (ch->in_mpcgroup == 1)) { 1021 ch->in_mpcgroup = 0; 1022 grp->num_channel_paths--; 1023 grp->active_channels[direction]--; 1024 1025 if (ch->xid_skb != NULL) 1026 dev_kfree_skb_any(ch->xid_skb); 1027 ch->xid_skb = NULL; 1028 1029 if (grp->channels_terminating) 1030 goto done; 1031 1032 if (((grp->active_channels[READ] == 0) && 1033 (grp->active_channels[WRITE] > 0)) 1034 || ((grp->active_channels[WRITE] == 0) && 1035 (grp->active_channels[READ] > 0))) 1036 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1037 } 1038 done: 1039 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1040 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1041 "read=%i, write=%i\n", __func__, action, 1042 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1043 grp->active_channels[READ], grp->active_channels[WRITE]); 1044 1045 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1046 } 1047 1048 /** 1049 * Unpack a just received skb and hand it over to 1050 * upper layers. 1051 * special MPC version of unpack_skb. 1052 * 1053 * ch The channel where this skb has been received. 1054 * pskb The received skb. 1055 */ 1056 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1057 { 1058 struct net_device *dev = ch->netdev; 1059 struct ctcm_priv *priv = dev->ml_priv; 1060 struct mpc_group *grp = priv->mpcg; 1061 struct pdu *curr_pdu; 1062 struct mpcg_info *mpcginfo; 1063 struct th_header *header = NULL; 1064 struct th_sweep *sweep = NULL; 1065 int pdu_last_seen = 0; 1066 __u32 new_len; 1067 struct sk_buff *skb; 1068 int skblen; 1069 int sendrc = 0; 1070 1071 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1072 __func__, dev->name, smp_processor_id(), ch->id); 1073 1074 header = (struct th_header *)pskb->data; 1075 if ((header->th_seg == 0) && 1076 (header->th_ch_flag == 0) && 1077 (header->th_blk_flag == 0) && 1078 (header->th_seq_num == 0)) 1079 /* nothing for us */ goto done; 1080 1081 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1082 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1083 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1084 1085 pskb->dev = dev; 1086 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1087 skb_pull(pskb, TH_HEADER_LENGTH); 1088 1089 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1090 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1091 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1092 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1093 (header->th_seq_num != ch->th_seq_num + 1) && 1094 (ch->th_seq_num != 0))) { 1095 /* This is NOT the next segment * 1096 * we are not the correct race winner * 1097 * go away and let someone else win * 1098 * BUT..this only applies if xid negot * 1099 * is done * 1100 */ 1101 grp->out_of_sequence += 1; 1102 __skb_push(pskb, TH_HEADER_LENGTH); 1103 skb_queue_tail(&ch->io_queue, pskb); 1104 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1105 "got:%08x\n", __func__, 1106 ch->th_seq_num + 1, header->th_seq_num); 1107 1108 return; 1109 } 1110 grp->out_of_sequence = 0; 1111 ch->th_seq_num = header->th_seq_num; 1112 1113 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1114 __func__, ch->th_seq_num); 1115 1116 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1117 goto done; 1118 while ((pskb->len > 0) && !pdu_last_seen) { 1119 curr_pdu = (struct pdu *)pskb->data; 1120 1121 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1122 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1123 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1124 __func__, pskb->len); 1125 1126 skb_pull(pskb, PDU_HEADER_LENGTH); 1127 1128 if (curr_pdu->pdu_flag & PDU_LAST) 1129 pdu_last_seen = 1; 1130 if (curr_pdu->pdu_flag & PDU_CNTL) 1131 pskb->protocol = htons(ETH_P_SNAP); 1132 else 1133 pskb->protocol = htons(ETH_P_SNA_DIX); 1134 1135 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1137 "%s(%s): Dropping packet with " 1138 "illegal siize %d", 1139 CTCM_FUNTAIL, dev->name, pskb->len); 1140 1141 priv->stats.rx_dropped++; 1142 priv->stats.rx_length_errors++; 1143 goto done; 1144 } 1145 skb_reset_mac_header(pskb); 1146 new_len = curr_pdu->pdu_offset; 1147 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1148 __func__, new_len); 1149 if ((new_len == 0) || (new_len > pskb->len)) { 1150 /* should never happen */ 1151 /* pskb len must be hosed...bail out */ 1152 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1153 "%s(%s): non valid pdu_offset: %04x", 1154 /* "data may be lost", */ 1155 CTCM_FUNTAIL, dev->name, new_len); 1156 goto done; 1157 } 1158 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1159 1160 if (!skb) { 1161 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1162 "%s(%s): MEMORY allocation error", 1163 CTCM_FUNTAIL, dev->name); 1164 priv->stats.rx_dropped++; 1165 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1166 goto done; 1167 } 1168 memcpy(skb_put(skb, new_len), pskb->data, new_len); 1169 1170 skb_reset_mac_header(skb); 1171 skb->dev = pskb->dev; 1172 skb->protocol = pskb->protocol; 1173 skb->ip_summed = CHECKSUM_UNNECESSARY; 1174 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1175 ch->pdu_seq++; 1176 1177 if (do_debug_data) { 1178 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1179 __func__, ch->pdu_seq); 1180 ctcm_pr_debug("%s: skb:%0lx " 1181 "skb len: %d \n", __func__, 1182 (unsigned long)skb, skb->len); 1183 ctcm_pr_debug("%s: up to 32 bytes " 1184 "of pdu_data sent\n", __func__); 1185 ctcmpc_dump32((char *)skb->data, skb->len); 1186 } 1187 1188 skblen = skb->len; 1189 sendrc = netif_rx(skb); 1190 priv->stats.rx_packets++; 1191 priv->stats.rx_bytes += skblen; 1192 skb_pull(pskb, new_len); /* point to next PDU */ 1193 } 1194 } else { 1195 mpcginfo = (struct mpcg_info *) 1196 kmalloc(sizeof(struct mpcg_info), gfp_type()); 1197 if (mpcginfo == NULL) 1198 goto done; 1199 1200 mpcginfo->ch = ch; 1201 mpcginfo->th = header; 1202 mpcginfo->skb = pskb; 1203 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1204 __func__); 1205 /* it's a sweep? */ 1206 sweep = (struct th_sweep *)pskb->data; 1207 mpcginfo->sweep = sweep; 1208 if (header->th_ch_flag == TH_SWEEP_REQ) 1209 mpc_rcvd_sweep_req(mpcginfo); 1210 else if (header->th_ch_flag == TH_SWEEP_RESP) 1211 mpc_rcvd_sweep_resp(mpcginfo); 1212 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1213 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1214 skb_pull(pskb, XID2_LENGTH); 1215 mpcginfo->xid = thisxid; 1216 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1217 } else if (header->th_blk_flag == TH_DISCONTACT) 1218 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1219 else if (header->th_seq_num != 0) { 1220 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1221 "%s(%s): control pkt expected\n", 1222 CTCM_FUNTAIL, dev->name); 1223 priv->stats.rx_dropped++; 1224 /* mpcginfo only used for non-data transfers */ 1225 kfree(mpcginfo); 1226 if (do_debug_data) 1227 ctcmpc_dump_skb(pskb, -8); 1228 } 1229 } 1230 done: 1231 1232 dev_kfree_skb_any(pskb); 1233 if (sendrc == NET_RX_DROP) { 1234 dev_warn(&dev->dev, 1235 "The network backlog for %s is exceeded, " 1236 "package dropped\n", __func__); 1237 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1238 } 1239 1240 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1241 __func__, dev->name, ch, ch->id); 1242 } 1243 1244 /** 1245 * tasklet helper for mpc's skb unpacking. 1246 * 1247 * ch The channel to work on. 1248 * Allow flow control back pressure to occur here. 1249 * Throttling back channel can result in excessive 1250 * channel inactivity and system deact of channel 1251 */ 1252 void ctcmpc_bh(unsigned long thischan) 1253 { 1254 struct channel *ch = (struct channel *)thischan; 1255 struct sk_buff *skb; 1256 struct net_device *dev = ch->netdev; 1257 struct ctcm_priv *priv = dev->ml_priv; 1258 struct mpc_group *grp = priv->mpcg; 1259 1260 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1261 dev->name, smp_processor_id(), __func__, ch->id); 1262 /* caller has requested driver to throttle back */ 1263 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1264 (skb = skb_dequeue(&ch->io_queue))) { 1265 ctcmpc_unpack_skb(ch, skb); 1266 if (grp->out_of_sequence > 20) { 1267 /* assume data loss has occurred if */ 1268 /* missing seq_num for extended */ 1269 /* period of time */ 1270 grp->out_of_sequence = 0; 1271 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1272 break; 1273 } 1274 if (skb == skb_peek(&ch->io_queue)) 1275 break; 1276 } 1277 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1278 __func__, dev->name, ch, ch->id); 1279 return; 1280 } 1281 1282 /* 1283 * MPC Group Initializations 1284 */ 1285 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1286 { 1287 struct mpc_group *grp; 1288 1289 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1290 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1291 1292 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1293 if (grp == NULL) 1294 return NULL; 1295 1296 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1297 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1298 mpcg_fsm_len, GFP_KERNEL); 1299 if (grp->fsm == NULL) { 1300 kfree(grp); 1301 return NULL; 1302 } 1303 1304 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1305 fsm_settimer(grp->fsm, &grp->timer); 1306 1307 grp->xid_skb = 1308 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1309 if (grp->xid_skb == NULL) { 1310 kfree_fsm(grp->fsm); 1311 kfree(grp); 1312 return NULL; 1313 } 1314 /* base xid for all channels in group */ 1315 grp->xid_skb_data = grp->xid_skb->data; 1316 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1317 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH), 1318 &thnorm, TH_HEADER_LENGTH); 1319 1320 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1321 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH); 1322 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1323 grp->xid->xid2_sender_id = jiffies; 1324 1325 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1326 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4); 1327 1328 grp->rcvd_xid_skb = 1329 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1330 if (grp->rcvd_xid_skb == NULL) { 1331 kfree_fsm(grp->fsm); 1332 dev_kfree_skb(grp->xid_skb); 1333 kfree(grp); 1334 return NULL; 1335 } 1336 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1337 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1338 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), 1339 &thnorm, TH_HEADER_LENGTH); 1340 grp->saved_xid2 = NULL; 1341 priv->xid = grp->xid; 1342 priv->mpcg = grp; 1343 return grp; 1344 } 1345 1346 /* 1347 * The MPC Group Station FSM 1348 */ 1349 1350 /* 1351 * MPC Group Station FSM actions 1352 * CTCM_PROTO_MPC only 1353 */ 1354 1355 /** 1356 * NOP action for statemachines 1357 */ 1358 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1359 { 1360 } 1361 1362 /* 1363 * invoked when the device transitions to dev_stopped 1364 * MPC will stop each individual channel if a single XID failure 1365 * occurs, or will intitiate all channels be stopped if a GROUP 1366 * level failure occurs. 1367 */ 1368 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1369 { 1370 struct net_device *dev = arg; 1371 struct ctcm_priv *priv; 1372 struct mpc_group *grp; 1373 int rc = 0; 1374 struct channel *wch, *rch; 1375 1376 BUG_ON(dev == NULL); 1377 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1378 1379 priv = dev->ml_priv; 1380 grp = priv->mpcg; 1381 grp->flow_off_called = 0; 1382 fsm_deltimer(&grp->timer); 1383 if (grp->channels_terminating) 1384 return; 1385 1386 grp->channels_terminating = 1; 1387 grp->saved_state = fsm_getstate(grp->fsm); 1388 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1389 if (grp->saved_state > MPCG_STATE_XID7INITF) 1390 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1391 "%s(%s): MPC GROUP INOPERATIVE", 1392 CTCM_FUNTAIL, dev->name); 1393 if ((grp->saved_state != MPCG_STATE_RESET) || 1394 /* dealloc_channel has been called */ 1395 (grp->port_persist == 0)) 1396 fsm_deltimer(&priv->restart_timer); 1397 1398 wch = priv->channel[WRITE]; 1399 rch = priv->channel[READ]; 1400 1401 switch (grp->saved_state) { 1402 case MPCG_STATE_RESET: 1403 case MPCG_STATE_INOP: 1404 case MPCG_STATE_XID2INITW: 1405 case MPCG_STATE_XID0IOWAIT: 1406 case MPCG_STATE_XID2INITX: 1407 case MPCG_STATE_XID7INITW: 1408 case MPCG_STATE_XID7INITX: 1409 case MPCG_STATE_XID0IOWAIX: 1410 case MPCG_STATE_XID7INITI: 1411 case MPCG_STATE_XID7INITZ: 1412 case MPCG_STATE_XID7INITF: 1413 break; 1414 case MPCG_STATE_FLOWC: 1415 case MPCG_STATE_READY: 1416 default: 1417 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1418 } 1419 1420 grp->xid2_tgnum = 0; 1421 grp->group_max_buflen = 0; /*min of all received */ 1422 grp->outstanding_xid2 = 0; 1423 grp->outstanding_xid7 = 0; 1424 grp->outstanding_xid7_p2 = 0; 1425 grp->saved_xid2 = NULL; 1426 grp->xidnogood = 0; 1427 grp->changed_side = 0; 1428 1429 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1430 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1431 grp->rcvd_xid_skb->len = 0; 1432 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1433 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm, 1434 TH_HEADER_LENGTH); 1435 1436 if (grp->send_qllc_disc == 1) { 1437 grp->send_qllc_disc = 0; 1438 rc = mpc_send_qllc_discontact(dev); 1439 } 1440 1441 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1442 /* This can result in INOP of VTAM PU due to halting of */ 1443 /* outstanding IO which causes a sense to be returned */ 1444 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1445 /* become unreachable without manual intervention */ 1446 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1447 grp->alloc_called = 0; 1448 fsm_deltimer(&priv->restart_timer); 1449 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1450 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1451 if (grp->saved_state > MPCG_STATE_XID7INITF) 1452 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1453 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1454 CTCM_FUNTAIL, dev->name); 1455 } else { 1456 fsm_deltimer(&priv->restart_timer); 1457 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1458 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1459 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1460 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1461 CTCM_FUNTAIL, dev->name); 1462 } 1463 } 1464 1465 /** 1466 * Handle mpc group action timeout. 1467 * MPC Group Station FSM action 1468 * CTCM_PROTO_MPC only 1469 * 1470 * fi An instance of an mpc_group fsm. 1471 * event The event, just happened. 1472 * arg Generic pointer, casted from net_device * upon call. 1473 */ 1474 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1475 { 1476 struct net_device *dev = arg; 1477 struct ctcm_priv *priv; 1478 struct mpc_group *grp; 1479 struct channel *wch; 1480 struct channel *rch; 1481 1482 BUG_ON(dev == NULL); 1483 1484 priv = dev->ml_priv; 1485 grp = priv->mpcg; 1486 wch = priv->channel[WRITE]; 1487 rch = priv->channel[READ]; 1488 1489 switch (fsm_getstate(grp->fsm)) { 1490 case MPCG_STATE_XID2INITW: 1491 /* Unless there is outstanding IO on the */ 1492 /* channel just return and wait for ATTN */ 1493 /* interrupt to begin XID negotiations */ 1494 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1495 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1496 break; 1497 default: 1498 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1499 } 1500 1501 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1502 "%s: dev=%s exit", 1503 CTCM_FUNTAIL, dev->name); 1504 return; 1505 } 1506 1507 /* 1508 * MPC Group Station FSM action 1509 * CTCM_PROTO_MPC only 1510 */ 1511 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1512 { 1513 struct mpcg_info *mpcginfo = arg; 1514 struct channel *ch = mpcginfo->ch; 1515 struct net_device *dev; 1516 struct ctcm_priv *priv; 1517 struct mpc_group *grp; 1518 1519 if (ch) { 1520 dev = ch->netdev; 1521 if (dev) { 1522 priv = dev->ml_priv; 1523 if (priv) { 1524 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1525 "%s: %s: %s\n", 1526 CTCM_FUNTAIL, dev->name, ch->id); 1527 grp = priv->mpcg; 1528 grp->send_qllc_disc = 1; 1529 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1530 } 1531 } 1532 } 1533 1534 return; 1535 } 1536 1537 /* 1538 * MPC Group Station - not part of FSM 1539 * CTCM_PROTO_MPC only 1540 * called from add_channel in ctcm_main.c 1541 */ 1542 void mpc_action_send_discontact(unsigned long thischan) 1543 { 1544 int rc; 1545 struct channel *ch = (struct channel *)thischan; 1546 unsigned long saveflags = 0; 1547 1548 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1549 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1550 (unsigned long)ch, 0xff, 0); 1551 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1552 1553 if (rc != 0) { 1554 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1555 } 1556 1557 return; 1558 } 1559 1560 1561 /* 1562 * helper function of mpc FSM 1563 * CTCM_PROTO_MPC only 1564 * mpc_action_rcvd_xid7 1565 */ 1566 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1567 { 1568 struct channel *ch = mpcginfo->ch; 1569 struct net_device *dev = ch->netdev; 1570 struct ctcm_priv *priv = dev->ml_priv; 1571 struct mpc_group *grp = priv->mpcg; 1572 struct xid2 *xid = mpcginfo->xid; 1573 int rc = 0; 1574 __u64 our_id = 0; 1575 __u64 their_id = 0; 1576 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1577 1578 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1579 1580 if (xid == NULL) { 1581 rc = 1; 1582 /* XID REJECTED: xid == NULL */ 1583 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1584 "%s(%s): xid = NULL", 1585 CTCM_FUNTAIL, ch->id); 1586 goto done; 1587 } 1588 1589 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1590 1591 /*the received direction should be the opposite of ours */ 1592 if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE : 1593 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1594 rc = 2; 1595 /* XID REJECTED: r/w channel pairing mismatch */ 1596 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1597 "%s(%s): r/w channel pairing mismatch", 1598 CTCM_FUNTAIL, ch->id); 1599 goto done; 1600 } 1601 1602 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1603 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1604 grp->group_max_buflen, xid->xid2_buf_len); 1605 1606 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1607 xid->xid2_buf_len - len) 1608 grp->group_max_buflen = xid->xid2_buf_len - len; 1609 } 1610 1611 if (grp->saved_xid2 == NULL) { 1612 grp->saved_xid2 = 1613 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1614 1615 memcpy(skb_put(grp->rcvd_xid_skb, 1616 XID2_LENGTH), xid, XID2_LENGTH); 1617 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1618 1619 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1620 grp->rcvd_xid_skb->len = 0; 1621 1622 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1623 our_id = (__u64)priv->xid->xid2_adj_id; 1624 our_id = our_id << 32; 1625 our_id = our_id + priv->xid->xid2_sender_id; 1626 their_id = (__u64)xid->xid2_adj_id; 1627 their_id = their_id << 32; 1628 their_id = their_id + xid->xid2_sender_id; 1629 /* lower id assume the xside role */ 1630 if (our_id < their_id) { 1631 grp->roll = XSIDE; 1632 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1633 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1634 CTCM_FUNTAIL, ch->id); 1635 } else { 1636 grp->roll = YSIDE; 1637 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1638 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1639 CTCM_FUNTAIL, ch->id); 1640 } 1641 1642 } else { 1643 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1644 rc = 3; 1645 /* XID REJECTED: xid flag byte4 mismatch */ 1646 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1647 "%s(%s): xid flag byte4 mismatch", 1648 CTCM_FUNTAIL, ch->id); 1649 } 1650 if (xid->xid2_flag2 == 0x40) { 1651 rc = 4; 1652 /* XID REJECTED - xid NOGOOD */ 1653 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1654 "%s(%s): xid NOGOOD", 1655 CTCM_FUNTAIL, ch->id); 1656 } 1657 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1658 rc = 5; 1659 /* XID REJECTED - Adjacent Station ID Mismatch */ 1660 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1661 "%s(%s): Adjacent Station ID Mismatch", 1662 CTCM_FUNTAIL, ch->id); 1663 } 1664 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1665 rc = 6; 1666 /* XID REJECTED - Sender Address Mismatch */ 1667 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1668 "%s(%s): Sender Address Mismatch", 1669 CTCM_FUNTAIL, ch->id); 1670 } 1671 } 1672 done: 1673 if (rc) { 1674 dev_warn(&dev->dev, 1675 "The XID used in the MPC protocol is not valid, " 1676 "rc = %d\n", rc); 1677 priv->xid->xid2_flag2 = 0x40; 1678 grp->saved_xid2->xid2_flag2 = 0x40; 1679 } 1680 1681 return rc; 1682 } 1683 1684 /* 1685 * MPC Group Station FSM action 1686 * CTCM_PROTO_MPC only 1687 */ 1688 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1689 { 1690 struct channel *ch = arg; 1691 int rc = 0; 1692 int gotlock = 0; 1693 unsigned long saveflags = 0; /* avoids compiler warning with 1694 spin_unlock_irqrestore */ 1695 1696 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1697 __func__, smp_processor_id(), ch, ch->id); 1698 1699 if (ctcm_checkalloc_buffer(ch)) 1700 goto done; 1701 1702 /* 1703 * skb data-buffer referencing: 1704 */ 1705 ch->trans_skb->data = ch->trans_skb_data; 1706 skb_reset_tail_pointer(ch->trans_skb); 1707 ch->trans_skb->len = 0; 1708 /* result of the previous 3 statements is NOT always 1709 * already set after ctcm_checkalloc_buffer 1710 * because of possible reuse of the trans_skb 1711 */ 1712 memset(ch->trans_skb->data, 0, 16); 1713 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1714 /* check is main purpose here: */ 1715 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1716 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1717 /* check is main purpose here: */ 1718 skb_put(ch->trans_skb, XID2_LENGTH); 1719 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1720 /* cleanup back to startpoint */ 1721 ch->trans_skb->data = ch->trans_skb_data; 1722 skb_reset_tail_pointer(ch->trans_skb); 1723 ch->trans_skb->len = 0; 1724 1725 /* non-checking rewrite of above skb data-buffer referencing: */ 1726 /* 1727 memset(ch->trans_skb->data, 0, 16); 1728 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1729 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1730 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1731 */ 1732 1733 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1734 ch->ccw[8].count = 0; 1735 ch->ccw[8].cda = 0x00; 1736 1737 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1738 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1739 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1740 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1741 1742 if (side == XSIDE) { 1743 /* mpc_action_xside_xid */ 1744 if (ch->xid_th == NULL) 1745 goto done; 1746 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1747 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1748 ch->ccw[9].count = TH_HEADER_LENGTH; 1749 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1750 1751 if (ch->xid == NULL) 1752 goto done; 1753 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1754 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1755 ch->ccw[10].count = XID2_LENGTH; 1756 ch->ccw[10].cda = virt_to_phys(ch->xid); 1757 1758 ch->ccw[11].cmd_code = CCW_CMD_READ; 1759 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1760 ch->ccw[11].count = TH_HEADER_LENGTH; 1761 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1762 1763 ch->ccw[12].cmd_code = CCW_CMD_READ; 1764 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1765 ch->ccw[12].count = XID2_LENGTH; 1766 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1767 1768 ch->ccw[13].cmd_code = CCW_CMD_READ; 1769 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1770 1771 } else { /* side == YSIDE : mpc_action_yside_xid */ 1772 ch->ccw[9].cmd_code = CCW_CMD_READ; 1773 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1774 ch->ccw[9].count = TH_HEADER_LENGTH; 1775 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1776 1777 ch->ccw[10].cmd_code = CCW_CMD_READ; 1778 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1779 ch->ccw[10].count = XID2_LENGTH; 1780 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1781 1782 if (ch->xid_th == NULL) 1783 goto done; 1784 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1785 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1786 ch->ccw[11].count = TH_HEADER_LENGTH; 1787 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1788 1789 if (ch->xid == NULL) 1790 goto done; 1791 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1792 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1793 ch->ccw[12].count = XID2_LENGTH; 1794 ch->ccw[12].cda = virt_to_phys(ch->xid); 1795 1796 if (ch->xid_id == NULL) 1797 goto done; 1798 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1799 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1800 1801 } 1802 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1803 ch->ccw[13].count = 4; 1804 1805 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1806 ch->ccw[14].flags = CCW_FLAG_SLI; 1807 ch->ccw[14].count = 0; 1808 ch->ccw[14].cda = 0; 1809 1810 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1811 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1812 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1813 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1814 1815 if (!in_irq()) { 1816 /* Such conditional locking is a known problem for 1817 * sparse because its static undeterministic. 1818 * Warnings should be ignored here. */ 1819 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1820 gotlock = 1; 1821 } 1822 1823 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1824 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1825 (unsigned long)ch, 0xff, 0); 1826 1827 if (gotlock) /* see remark above about conditional locking */ 1828 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1829 1830 if (rc != 0) { 1831 ctcm_ccw_check_rc(ch, rc, 1832 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1833 } 1834 1835 done: 1836 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1837 __func__, ch, ch->id); 1838 return; 1839 1840 } 1841 1842 /* 1843 * MPC Group Station FSM action 1844 * CTCM_PROTO_MPC only 1845 */ 1846 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1847 { 1848 mpc_action_side_xid(fsm, arg, XSIDE); 1849 } 1850 1851 /* 1852 * MPC Group Station FSM action 1853 * CTCM_PROTO_MPC only 1854 */ 1855 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1856 { 1857 mpc_action_side_xid(fsm, arg, YSIDE); 1858 } 1859 1860 /* 1861 * MPC Group Station FSM action 1862 * CTCM_PROTO_MPC only 1863 */ 1864 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1865 { 1866 struct channel *ch = arg; 1867 struct net_device *dev = ch->netdev; 1868 struct ctcm_priv *priv = dev->ml_priv; 1869 struct mpc_group *grp = priv->mpcg; 1870 1871 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1872 __func__, smp_processor_id(), ch, ch->id); 1873 1874 if (ch->xid == NULL) { 1875 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1876 "%s(%s): ch->xid == NULL", 1877 CTCM_FUNTAIL, dev->name); 1878 return; 1879 } 1880 1881 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1882 1883 ch->xid->xid2_option = XID2_0; 1884 1885 switch (fsm_getstate(grp->fsm)) { 1886 case MPCG_STATE_XID2INITW: 1887 case MPCG_STATE_XID2INITX: 1888 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1889 break; 1890 case MPCG_STATE_XID0IOWAIT: 1891 case MPCG_STATE_XID0IOWAIX: 1892 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1893 break; 1894 } 1895 1896 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1897 1898 return; 1899 } 1900 1901 /* 1902 * MPC Group Station FSM action 1903 * CTCM_PROTO_MPC only 1904 */ 1905 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1906 { 1907 struct net_device *dev = arg; 1908 struct ctcm_priv *priv = dev->ml_priv; 1909 struct mpc_group *grp = NULL; 1910 int direction; 1911 int send = 0; 1912 1913 if (priv) 1914 grp = priv->mpcg; 1915 if (grp == NULL) 1916 return; 1917 1918 for (direction = READ; direction <= WRITE; direction++) { 1919 struct channel *ch = priv->channel[direction]; 1920 struct xid2 *thisxid = ch->xid; 1921 ch->xid_skb->data = ch->xid_skb_data; 1922 skb_reset_tail_pointer(ch->xid_skb); 1923 ch->xid_skb->len = 0; 1924 thisxid->xid2_option = XID2_7; 1925 send = 0; 1926 1927 /* xid7 phase 1 */ 1928 if (grp->outstanding_xid7_p2 > 0) { 1929 if (grp->roll == YSIDE) { 1930 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1931 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1932 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1933 memcpy(skb_put(ch->xid_skb, 1934 TH_HEADER_LENGTH), 1935 &thdummy, TH_HEADER_LENGTH); 1936 send = 1; 1937 } 1938 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1939 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1940 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1941 memcpy(skb_put(ch->xid_skb, 1942 TH_HEADER_LENGTH), 1943 &thnorm, TH_HEADER_LENGTH); 1944 send = 1; 1945 } 1946 } else { 1947 /* xid7 phase 2 */ 1948 if (grp->roll == YSIDE) { 1949 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1950 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1951 memcpy(skb_put(ch->xid_skb, 1952 TH_HEADER_LENGTH), 1953 &thnorm, TH_HEADER_LENGTH); 1954 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1955 send = 1; 1956 } 1957 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1958 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1959 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1960 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH), 1961 &thdummy, TH_HEADER_LENGTH); 1962 send = 1; 1963 } 1964 } 1965 1966 if (send) 1967 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1968 } 1969 1970 return; 1971 } 1972 1973 /* 1974 * MPC Group Station FSM action 1975 * CTCM_PROTO_MPC only 1976 */ 1977 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1978 { 1979 1980 struct mpcg_info *mpcginfo = arg; 1981 struct channel *ch = mpcginfo->ch; 1982 struct net_device *dev = ch->netdev; 1983 struct ctcm_priv *priv = dev->ml_priv; 1984 struct mpc_group *grp = priv->mpcg; 1985 1986 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1987 __func__, ch->id, grp->outstanding_xid2, 1988 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1989 1990 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1991 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1992 1993 grp->outstanding_xid2--; 1994 grp->outstanding_xid7++; 1995 grp->outstanding_xid7_p2++; 1996 1997 /* must change state before validating xid to */ 1998 /* properly handle interim interrupts received*/ 1999 switch (fsm_getstate(grp->fsm)) { 2000 case MPCG_STATE_XID2INITW: 2001 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 2002 mpc_validate_xid(mpcginfo); 2003 break; 2004 case MPCG_STATE_XID0IOWAIT: 2005 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 2006 mpc_validate_xid(mpcginfo); 2007 break; 2008 case MPCG_STATE_XID2INITX: 2009 if (grp->outstanding_xid2 == 0) { 2010 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 2011 mpc_validate_xid(mpcginfo); 2012 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2013 } 2014 break; 2015 case MPCG_STATE_XID0IOWAIX: 2016 if (grp->outstanding_xid2 == 0) { 2017 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 2018 mpc_validate_xid(mpcginfo); 2019 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2020 } 2021 break; 2022 } 2023 kfree(mpcginfo); 2024 2025 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 2026 __func__, ch->id, grp->outstanding_xid2, 2027 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2028 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2029 __func__, ch->id, 2030 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2031 return; 2032 2033 } 2034 2035 2036 /* 2037 * MPC Group Station FSM action 2038 * CTCM_PROTO_MPC only 2039 */ 2040 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2041 { 2042 struct mpcg_info *mpcginfo = arg; 2043 struct channel *ch = mpcginfo->ch; 2044 struct net_device *dev = ch->netdev; 2045 struct ctcm_priv *priv = dev->ml_priv; 2046 struct mpc_group *grp = priv->mpcg; 2047 2048 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2049 __func__, smp_processor_id(), ch, ch->id); 2050 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2051 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2052 2053 grp->outstanding_xid7--; 2054 ch->xid_skb->data = ch->xid_skb_data; 2055 skb_reset_tail_pointer(ch->xid_skb); 2056 ch->xid_skb->len = 0; 2057 2058 switch (fsm_getstate(grp->fsm)) { 2059 case MPCG_STATE_XID7INITI: 2060 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2061 mpc_validate_xid(mpcginfo); 2062 break; 2063 case MPCG_STATE_XID7INITW: 2064 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2065 mpc_validate_xid(mpcginfo); 2066 break; 2067 case MPCG_STATE_XID7INITZ: 2068 case MPCG_STATE_XID7INITX: 2069 if (grp->outstanding_xid7 == 0) { 2070 if (grp->outstanding_xid7_p2 > 0) { 2071 grp->outstanding_xid7 = 2072 grp->outstanding_xid7_p2; 2073 grp->outstanding_xid7_p2 = 0; 2074 } else 2075 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2076 2077 mpc_validate_xid(mpcginfo); 2078 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2079 break; 2080 } 2081 mpc_validate_xid(mpcginfo); 2082 break; 2083 } 2084 kfree(mpcginfo); 2085 return; 2086 } 2087 2088 /* 2089 * mpc_action helper of an MPC Group Station FSM action 2090 * CTCM_PROTO_MPC only 2091 */ 2092 static int mpc_send_qllc_discontact(struct net_device *dev) 2093 { 2094 __u32 new_len = 0; 2095 struct sk_buff *skb; 2096 struct qllc *qllcptr; 2097 struct ctcm_priv *priv = dev->ml_priv; 2098 struct mpc_group *grp = priv->mpcg; 2099 2100 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2101 __func__, mpcg_state_names[grp->saved_state]); 2102 2103 switch (grp->saved_state) { 2104 /* 2105 * establish conn callback function is 2106 * preferred method to report failure 2107 */ 2108 case MPCG_STATE_XID0IOWAIT: 2109 case MPCG_STATE_XID0IOWAIX: 2110 case MPCG_STATE_XID7INITI: 2111 case MPCG_STATE_XID7INITZ: 2112 case MPCG_STATE_XID2INITW: 2113 case MPCG_STATE_XID2INITX: 2114 case MPCG_STATE_XID7INITW: 2115 case MPCG_STATE_XID7INITX: 2116 if (grp->estconnfunc) { 2117 grp->estconnfunc(grp->port_num, -1, 0); 2118 grp->estconnfunc = NULL; 2119 break; 2120 } 2121 case MPCG_STATE_FLOWC: 2122 case MPCG_STATE_READY: 2123 grp->send_qllc_disc = 2; 2124 new_len = sizeof(struct qllc); 2125 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2126 if (qllcptr == NULL) { 2127 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2128 "%s(%s): qllcptr allocation error", 2129 CTCM_FUNTAIL, dev->name); 2130 return -ENOMEM; 2131 } 2132 2133 qllcptr->qllc_address = 0xcc; 2134 qllcptr->qllc_commands = 0x03; 2135 2136 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2137 2138 if (skb == NULL) { 2139 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2140 "%s(%s): skb allocation error", 2141 CTCM_FUNTAIL, dev->name); 2142 priv->stats.rx_dropped++; 2143 kfree(qllcptr); 2144 return -ENOMEM; 2145 } 2146 2147 memcpy(skb_put(skb, new_len), qllcptr, new_len); 2148 kfree(qllcptr); 2149 2150 if (skb_headroom(skb) < 4) { 2151 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2152 "%s(%s): skb_headroom error", 2153 CTCM_FUNTAIL, dev->name); 2154 dev_kfree_skb_any(skb); 2155 return -ENOMEM; 2156 } 2157 2158 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq; 2159 priv->channel[READ]->pdu_seq++; 2160 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2161 __func__, priv->channel[READ]->pdu_seq); 2162 2163 /* receipt of CC03 resets anticipated sequence number on 2164 receiving side */ 2165 priv->channel[READ]->pdu_seq = 0x00; 2166 skb_reset_mac_header(skb); 2167 skb->dev = dev; 2168 skb->protocol = htons(ETH_P_SNAP); 2169 skb->ip_summed = CHECKSUM_UNNECESSARY; 2170 2171 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2172 2173 netif_rx(skb); 2174 break; 2175 default: 2176 break; 2177 2178 } 2179 2180 return 0; 2181 } 2182 /* --- This is the END my friend --- */ 2183 2184