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 = kmalloc(sizeof(struct th_sweep), gfp_type()); 673 674 if (!header) { 675 dev_kfree_skb_any(sweep_skb); 676 rc = -ENOMEM; 677 goto done; 678 } 679 680 header->th.th_seg = 0x00 ; 681 header->th.th_ch_flag = TH_SWEEP_RESP; 682 header->th.th_blk_flag = 0x00; 683 header->th.th_is_xid = 0x00; 684 header->th.th_seq_num = 0x00; 685 header->sw.th_last_seq = ch->th_seq_num; 686 687 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); 688 689 kfree(header); 690 691 dev->trans_start = jiffies; 692 skb_queue_tail(&ch->sweep_queue, sweep_skb); 693 694 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 695 696 return; 697 698 done: 699 grp->in_sweep = 0; 700 ctcm_clear_busy_do(dev); 701 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 702 703 return; 704 } 705 706 /* 707 * helper function of ctcmpc_unpack_skb 708 */ 709 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 710 { 711 struct channel *rch = mpcginfo->ch; 712 struct net_device *dev = rch->netdev; 713 struct ctcm_priv *priv = dev->ml_priv; 714 struct mpc_group *grp = priv->mpcg; 715 struct channel *ch = priv->channel[WRITE]; 716 717 if (do_debug) 718 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 719 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 720 721 if (grp->in_sweep == 0) { 722 grp->in_sweep = 1; 723 ctcm_test_and_set_busy(dev); 724 grp->sweep_req_pend_num = grp->active_channels[READ]; 725 grp->sweep_rsp_pend_num = grp->active_channels[READ]; 726 } 727 728 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 729 730 grp->sweep_req_pend_num--; 731 ctcmpc_send_sweep_resp(ch); 732 kfree(mpcginfo); 733 return; 734 } 735 736 /* 737 * MPC Group Station FSM definitions 738 */ 739 static const char *mpcg_event_names[] = { 740 [MPCG_EVENT_INOP] = "INOP Condition", 741 [MPCG_EVENT_DISCONC] = "Discontact Received", 742 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 743 [MPCG_EVENT_XID2] = "XID2 Received", 744 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 745 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 746 [MPCG_EVENT_TIMER] = "XID Setup Timer", 747 [MPCG_EVENT_DOIO] = "XID DoIO", 748 }; 749 750 static const char *mpcg_state_names[] = { 751 [MPCG_STATE_RESET] = "Reset", 752 [MPCG_STATE_INOP] = "INOP", 753 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 754 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 755 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 756 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 757 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 758 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 759 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 760 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 761 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 762 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 763 [MPCG_STATE_READY] = "READY", 764 }; 765 766 /* 767 * The MPC Group Station FSM 768 * 22 events 769 */ 770 static const fsm_node mpcg_fsm[] = { 771 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 772 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 773 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 774 775 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 776 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 777 778 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 779 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 780 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 781 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 782 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 783 784 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 785 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 786 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 787 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 788 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 789 790 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 791 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 792 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 793 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 794 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 795 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 796 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 797 798 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 799 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 800 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 801 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 802 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 803 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 804 805 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 806 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 807 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 808 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 809 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 810 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 811 812 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 813 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 814 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 815 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 816 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 817 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 818 819 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 820 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 821 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 822 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 823 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 824 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 825 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 826 827 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 828 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 829 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 830 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 831 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 832 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 833 834 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 835 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 836 }; 837 838 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 839 840 /* 841 * MPC Group Station FSM action 842 * CTCM_PROTO_MPC only 843 */ 844 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 845 { 846 struct net_device *dev = arg; 847 struct ctcm_priv *priv = dev->ml_priv; 848 struct mpc_group *grp = priv->mpcg; 849 850 if (grp == NULL) { 851 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 852 "%s(%s): No MPC group", 853 CTCM_FUNTAIL, dev->name); 854 return; 855 } 856 857 fsm_deltimer(&grp->timer); 858 859 if (grp->saved_xid2->xid2_flag2 == 0x40) { 860 priv->xid->xid2_flag2 = 0x00; 861 if (grp->estconnfunc) { 862 grp->estconnfunc(grp->port_num, 1, 863 grp->group_max_buflen); 864 grp->estconnfunc = NULL; 865 } else if (grp->allochanfunc) 866 grp->send_qllc_disc = 1; 867 868 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 869 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 870 "%s(%s): fails", 871 CTCM_FUNTAIL, dev->name); 872 return; 873 } 874 875 grp->port_persist = 1; 876 grp->out_of_sequence = 0; 877 grp->estconn_called = 0; 878 879 tasklet_hi_schedule(&grp->mpc_tasklet2); 880 881 return; 882 } 883 884 /* 885 * helper of ctcm_init_netdevice 886 * CTCM_PROTO_MPC only 887 */ 888 void mpc_group_ready(unsigned long adev) 889 { 890 struct net_device *dev = (struct net_device *)adev; 891 struct ctcm_priv *priv = dev->ml_priv; 892 struct mpc_group *grp = priv->mpcg; 893 struct channel *ch = NULL; 894 895 if (grp == NULL) { 896 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 897 "%s(%s): No MPC group", 898 CTCM_FUNTAIL, dev->name); 899 return; 900 } 901 902 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 903 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 904 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 905 906 fsm_newstate(grp->fsm, MPCG_STATE_READY); 907 908 /* Put up a read on the channel */ 909 ch = priv->channel[READ]; 910 ch->pdu_seq = 0; 911 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 912 __func__, ch->pdu_seq); 913 914 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 915 /* Put the write channel in idle state */ 916 ch = priv->channel[WRITE]; 917 if (ch->collect_len > 0) { 918 spin_lock(&ch->collect_lock); 919 ctcm_purge_skb_queue(&ch->collect_queue); 920 ch->collect_len = 0; 921 spin_unlock(&ch->collect_lock); 922 } 923 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 924 ctcm_clear_busy(dev); 925 926 if (grp->estconnfunc) { 927 grp->estconnfunc(grp->port_num, 0, 928 grp->group_max_buflen); 929 grp->estconnfunc = NULL; 930 } else if (grp->allochanfunc) 931 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 932 933 grp->send_qllc_disc = 1; 934 grp->changed_side = 0; 935 936 return; 937 938 } 939 940 /* 941 * Increment the MPC Group Active Channel Counts 942 * helper of dev_action (called from channel fsm) 943 */ 944 void mpc_channel_action(struct channel *ch, int direction, int action) 945 { 946 struct net_device *dev = ch->netdev; 947 struct ctcm_priv *priv = dev->ml_priv; 948 struct mpc_group *grp = priv->mpcg; 949 950 if (grp == NULL) { 951 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 952 "%s(%s): No MPC group", 953 CTCM_FUNTAIL, dev->name); 954 return; 955 } 956 957 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 958 959 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 960 "%s: %i / Grp:%s total_channels=%i, active_channels: " 961 "read=%i, write=%i\n", __func__, action, 962 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 963 grp->active_channels[READ], grp->active_channels[WRITE]); 964 965 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 966 grp->num_channel_paths++; 967 grp->active_channels[direction]++; 968 grp->outstanding_xid2++; 969 ch->in_mpcgroup = 1; 970 971 if (ch->xid_skb != NULL) 972 dev_kfree_skb_any(ch->xid_skb); 973 974 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 975 GFP_ATOMIC | GFP_DMA); 976 if (ch->xid_skb == NULL) { 977 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 978 "%s(%s): Couldn't alloc ch xid_skb\n", 979 CTCM_FUNTAIL, dev->name); 980 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 981 return; 982 } 983 ch->xid_skb_data = ch->xid_skb->data; 984 ch->xid_th = (struct th_header *)ch->xid_skb->data; 985 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 986 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 987 skb_put(ch->xid_skb, XID2_LENGTH); 988 ch->xid_id = skb_tail_pointer(ch->xid_skb); 989 ch->xid_skb->data = ch->xid_skb_data; 990 skb_reset_tail_pointer(ch->xid_skb); 991 ch->xid_skb->len = 0; 992 993 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len), 994 grp->xid_skb->data, 995 grp->xid_skb->len); 996 997 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ) 998 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 999 1000 if (CHANNEL_DIRECTION(ch->flags) == WRITE) 1001 ch->xid->xid2_buf_len = 0x00; 1002 1003 ch->xid_skb->data = ch->xid_skb_data; 1004 skb_reset_tail_pointer(ch->xid_skb); 1005 ch->xid_skb->len = 0; 1006 1007 fsm_newstate(ch->fsm, CH_XID0_PENDING); 1008 1009 if ((grp->active_channels[READ] > 0) && 1010 (grp->active_channels[WRITE] > 0) && 1011 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 1012 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 1013 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 1014 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 1015 __func__, dev->name); 1016 } 1017 } else if ((action == MPC_CHANNEL_REMOVE) && 1018 (ch->in_mpcgroup == 1)) { 1019 ch->in_mpcgroup = 0; 1020 grp->num_channel_paths--; 1021 grp->active_channels[direction]--; 1022 1023 if (ch->xid_skb != NULL) 1024 dev_kfree_skb_any(ch->xid_skb); 1025 ch->xid_skb = NULL; 1026 1027 if (grp->channels_terminating) 1028 goto done; 1029 1030 if (((grp->active_channels[READ] == 0) && 1031 (grp->active_channels[WRITE] > 0)) 1032 || ((grp->active_channels[WRITE] == 0) && 1033 (grp->active_channels[READ] > 0))) 1034 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1035 } 1036 done: 1037 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1038 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1039 "read=%i, write=%i\n", __func__, action, 1040 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1041 grp->active_channels[READ], grp->active_channels[WRITE]); 1042 1043 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1044 } 1045 1046 /** 1047 * Unpack a just received skb and hand it over to 1048 * upper layers. 1049 * special MPC version of unpack_skb. 1050 * 1051 * ch The channel where this skb has been received. 1052 * pskb The received skb. 1053 */ 1054 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1055 { 1056 struct net_device *dev = ch->netdev; 1057 struct ctcm_priv *priv = dev->ml_priv; 1058 struct mpc_group *grp = priv->mpcg; 1059 struct pdu *curr_pdu; 1060 struct mpcg_info *mpcginfo; 1061 struct th_header *header = NULL; 1062 struct th_sweep *sweep = NULL; 1063 int pdu_last_seen = 0; 1064 __u32 new_len; 1065 struct sk_buff *skb; 1066 int skblen; 1067 int sendrc = 0; 1068 1069 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1070 __func__, dev->name, smp_processor_id(), ch->id); 1071 1072 header = (struct th_header *)pskb->data; 1073 if ((header->th_seg == 0) && 1074 (header->th_ch_flag == 0) && 1075 (header->th_blk_flag == 0) && 1076 (header->th_seq_num == 0)) 1077 /* nothing for us */ goto done; 1078 1079 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1080 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1081 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1082 1083 pskb->dev = dev; 1084 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1085 skb_pull(pskb, TH_HEADER_LENGTH); 1086 1087 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1088 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1089 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1090 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1091 (header->th_seq_num != ch->th_seq_num + 1) && 1092 (ch->th_seq_num != 0))) { 1093 /* This is NOT the next segment * 1094 * we are not the correct race winner * 1095 * go away and let someone else win * 1096 * BUT..this only applies if xid negot * 1097 * is done * 1098 */ 1099 grp->out_of_sequence += 1; 1100 __skb_push(pskb, TH_HEADER_LENGTH); 1101 skb_queue_tail(&ch->io_queue, pskb); 1102 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1103 "got:%08x\n", __func__, 1104 ch->th_seq_num + 1, header->th_seq_num); 1105 1106 return; 1107 } 1108 grp->out_of_sequence = 0; 1109 ch->th_seq_num = header->th_seq_num; 1110 1111 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1112 __func__, ch->th_seq_num); 1113 1114 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1115 goto done; 1116 while ((pskb->len > 0) && !pdu_last_seen) { 1117 curr_pdu = (struct pdu *)pskb->data; 1118 1119 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1120 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1121 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1122 __func__, pskb->len); 1123 1124 skb_pull(pskb, PDU_HEADER_LENGTH); 1125 1126 if (curr_pdu->pdu_flag & PDU_LAST) 1127 pdu_last_seen = 1; 1128 if (curr_pdu->pdu_flag & PDU_CNTL) 1129 pskb->protocol = htons(ETH_P_SNAP); 1130 else 1131 pskb->protocol = htons(ETH_P_SNA_DIX); 1132 1133 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1134 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1135 "%s(%s): Dropping packet with " 1136 "illegal siize %d", 1137 CTCM_FUNTAIL, dev->name, pskb->len); 1138 1139 priv->stats.rx_dropped++; 1140 priv->stats.rx_length_errors++; 1141 goto done; 1142 } 1143 skb_reset_mac_header(pskb); 1144 new_len = curr_pdu->pdu_offset; 1145 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1146 __func__, new_len); 1147 if ((new_len == 0) || (new_len > pskb->len)) { 1148 /* should never happen */ 1149 /* pskb len must be hosed...bail out */ 1150 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1151 "%s(%s): non valid pdu_offset: %04x", 1152 /* "data may be lost", */ 1153 CTCM_FUNTAIL, dev->name, new_len); 1154 goto done; 1155 } 1156 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1157 1158 if (!skb) { 1159 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1160 "%s(%s): MEMORY allocation error", 1161 CTCM_FUNTAIL, dev->name); 1162 priv->stats.rx_dropped++; 1163 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1164 goto done; 1165 } 1166 memcpy(skb_put(skb, new_len), pskb->data, new_len); 1167 1168 skb_reset_mac_header(skb); 1169 skb->dev = pskb->dev; 1170 skb->protocol = pskb->protocol; 1171 skb->ip_summed = CHECKSUM_UNNECESSARY; 1172 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1173 ch->pdu_seq++; 1174 1175 if (do_debug_data) { 1176 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1177 __func__, ch->pdu_seq); 1178 ctcm_pr_debug("%s: skb:%0lx " 1179 "skb len: %d \n", __func__, 1180 (unsigned long)skb, skb->len); 1181 ctcm_pr_debug("%s: up to 32 bytes " 1182 "of pdu_data sent\n", __func__); 1183 ctcmpc_dump32((char *)skb->data, skb->len); 1184 } 1185 1186 skblen = skb->len; 1187 sendrc = netif_rx(skb); 1188 priv->stats.rx_packets++; 1189 priv->stats.rx_bytes += skblen; 1190 skb_pull(pskb, new_len); /* point to next PDU */ 1191 } 1192 } else { 1193 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1194 if (mpcginfo == NULL) 1195 goto done; 1196 1197 mpcginfo->ch = ch; 1198 mpcginfo->th = header; 1199 mpcginfo->skb = pskb; 1200 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1201 __func__); 1202 /* it's a sweep? */ 1203 sweep = (struct th_sweep *)pskb->data; 1204 mpcginfo->sweep = sweep; 1205 if (header->th_ch_flag == TH_SWEEP_REQ) 1206 mpc_rcvd_sweep_req(mpcginfo); 1207 else if (header->th_ch_flag == TH_SWEEP_RESP) 1208 mpc_rcvd_sweep_resp(mpcginfo); 1209 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1210 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1211 skb_pull(pskb, XID2_LENGTH); 1212 mpcginfo->xid = thisxid; 1213 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1214 } else if (header->th_blk_flag == TH_DISCONTACT) 1215 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1216 else if (header->th_seq_num != 0) { 1217 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1218 "%s(%s): control pkt expected\n", 1219 CTCM_FUNTAIL, dev->name); 1220 priv->stats.rx_dropped++; 1221 /* mpcginfo only used for non-data transfers */ 1222 kfree(mpcginfo); 1223 if (do_debug_data) 1224 ctcmpc_dump_skb(pskb, -8); 1225 } 1226 } 1227 done: 1228 1229 dev_kfree_skb_any(pskb); 1230 if (sendrc == NET_RX_DROP) { 1231 dev_warn(&dev->dev, 1232 "The network backlog for %s is exceeded, " 1233 "package dropped\n", __func__); 1234 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1235 } 1236 1237 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1238 __func__, dev->name, ch, ch->id); 1239 } 1240 1241 /** 1242 * tasklet helper for mpc's skb unpacking. 1243 * 1244 * ch The channel to work on. 1245 * Allow flow control back pressure to occur here. 1246 * Throttling back channel can result in excessive 1247 * channel inactivity and system deact of channel 1248 */ 1249 void ctcmpc_bh(unsigned long thischan) 1250 { 1251 struct channel *ch = (struct channel *)thischan; 1252 struct sk_buff *skb; 1253 struct net_device *dev = ch->netdev; 1254 struct ctcm_priv *priv = dev->ml_priv; 1255 struct mpc_group *grp = priv->mpcg; 1256 1257 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1258 dev->name, smp_processor_id(), __func__, ch->id); 1259 /* caller has requested driver to throttle back */ 1260 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1261 (skb = skb_dequeue(&ch->io_queue))) { 1262 ctcmpc_unpack_skb(ch, skb); 1263 if (grp->out_of_sequence > 20) { 1264 /* assume data loss has occurred if */ 1265 /* missing seq_num for extended */ 1266 /* period of time */ 1267 grp->out_of_sequence = 0; 1268 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1269 break; 1270 } 1271 if (skb == skb_peek(&ch->io_queue)) 1272 break; 1273 } 1274 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1275 __func__, dev->name, ch, ch->id); 1276 return; 1277 } 1278 1279 /* 1280 * MPC Group Initializations 1281 */ 1282 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1283 { 1284 struct mpc_group *grp; 1285 1286 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1287 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1288 1289 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1290 if (grp == NULL) 1291 return NULL; 1292 1293 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1294 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1295 mpcg_fsm_len, GFP_KERNEL); 1296 if (grp->fsm == NULL) { 1297 kfree(grp); 1298 return NULL; 1299 } 1300 1301 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1302 fsm_settimer(grp->fsm, &grp->timer); 1303 1304 grp->xid_skb = 1305 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1306 if (grp->xid_skb == NULL) { 1307 kfree_fsm(grp->fsm); 1308 kfree(grp); 1309 return NULL; 1310 } 1311 /* base xid for all channels in group */ 1312 grp->xid_skb_data = grp->xid_skb->data; 1313 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1314 memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH), 1315 &thnorm, TH_HEADER_LENGTH); 1316 1317 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1318 memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH); 1319 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1320 grp->xid->xid2_sender_id = jiffies; 1321 1322 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1323 memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4); 1324 1325 grp->rcvd_xid_skb = 1326 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1327 if (grp->rcvd_xid_skb == NULL) { 1328 kfree_fsm(grp->fsm); 1329 dev_kfree_skb(grp->xid_skb); 1330 kfree(grp); 1331 return NULL; 1332 } 1333 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1334 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1335 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), 1336 &thnorm, TH_HEADER_LENGTH); 1337 grp->saved_xid2 = NULL; 1338 priv->xid = grp->xid; 1339 priv->mpcg = grp; 1340 return grp; 1341 } 1342 1343 /* 1344 * The MPC Group Station FSM 1345 */ 1346 1347 /* 1348 * MPC Group Station FSM actions 1349 * CTCM_PROTO_MPC only 1350 */ 1351 1352 /** 1353 * NOP action for statemachines 1354 */ 1355 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1356 { 1357 } 1358 1359 /* 1360 * invoked when the device transitions to dev_stopped 1361 * MPC will stop each individual channel if a single XID failure 1362 * occurs, or will intitiate all channels be stopped if a GROUP 1363 * level failure occurs. 1364 */ 1365 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1366 { 1367 struct net_device *dev = arg; 1368 struct ctcm_priv *priv; 1369 struct mpc_group *grp; 1370 int rc = 0; 1371 struct channel *wch, *rch; 1372 1373 BUG_ON(dev == NULL); 1374 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1375 1376 priv = dev->ml_priv; 1377 grp = priv->mpcg; 1378 grp->flow_off_called = 0; 1379 fsm_deltimer(&grp->timer); 1380 if (grp->channels_terminating) 1381 return; 1382 1383 grp->channels_terminating = 1; 1384 grp->saved_state = fsm_getstate(grp->fsm); 1385 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1386 if (grp->saved_state > MPCG_STATE_XID7INITF) 1387 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1388 "%s(%s): MPC GROUP INOPERATIVE", 1389 CTCM_FUNTAIL, dev->name); 1390 if ((grp->saved_state != MPCG_STATE_RESET) || 1391 /* dealloc_channel has been called */ 1392 (grp->port_persist == 0)) 1393 fsm_deltimer(&priv->restart_timer); 1394 1395 wch = priv->channel[WRITE]; 1396 rch = priv->channel[READ]; 1397 1398 switch (grp->saved_state) { 1399 case MPCG_STATE_RESET: 1400 case MPCG_STATE_INOP: 1401 case MPCG_STATE_XID2INITW: 1402 case MPCG_STATE_XID0IOWAIT: 1403 case MPCG_STATE_XID2INITX: 1404 case MPCG_STATE_XID7INITW: 1405 case MPCG_STATE_XID7INITX: 1406 case MPCG_STATE_XID0IOWAIX: 1407 case MPCG_STATE_XID7INITI: 1408 case MPCG_STATE_XID7INITZ: 1409 case MPCG_STATE_XID7INITF: 1410 break; 1411 case MPCG_STATE_FLOWC: 1412 case MPCG_STATE_READY: 1413 default: 1414 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1415 } 1416 1417 grp->xid2_tgnum = 0; 1418 grp->group_max_buflen = 0; /*min of all received */ 1419 grp->outstanding_xid2 = 0; 1420 grp->outstanding_xid7 = 0; 1421 grp->outstanding_xid7_p2 = 0; 1422 grp->saved_xid2 = NULL; 1423 grp->xidnogood = 0; 1424 grp->changed_side = 0; 1425 1426 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1427 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1428 grp->rcvd_xid_skb->len = 0; 1429 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1430 memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm, 1431 TH_HEADER_LENGTH); 1432 1433 if (grp->send_qllc_disc == 1) { 1434 grp->send_qllc_disc = 0; 1435 rc = mpc_send_qllc_discontact(dev); 1436 } 1437 1438 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1439 /* This can result in INOP of VTAM PU due to halting of */ 1440 /* outstanding IO which causes a sense to be returned */ 1441 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1442 /* become unreachable without manual intervention */ 1443 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1444 grp->alloc_called = 0; 1445 fsm_deltimer(&priv->restart_timer); 1446 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1447 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1448 if (grp->saved_state > MPCG_STATE_XID7INITF) 1449 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1450 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1451 CTCM_FUNTAIL, dev->name); 1452 } else { 1453 fsm_deltimer(&priv->restart_timer); 1454 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1455 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1456 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1457 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1458 CTCM_FUNTAIL, dev->name); 1459 } 1460 } 1461 1462 /** 1463 * Handle mpc group action timeout. 1464 * MPC Group Station FSM action 1465 * CTCM_PROTO_MPC only 1466 * 1467 * fi An instance of an mpc_group fsm. 1468 * event The event, just happened. 1469 * arg Generic pointer, casted from net_device * upon call. 1470 */ 1471 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1472 { 1473 struct net_device *dev = arg; 1474 struct ctcm_priv *priv; 1475 struct mpc_group *grp; 1476 struct channel *wch; 1477 struct channel *rch; 1478 1479 BUG_ON(dev == NULL); 1480 1481 priv = dev->ml_priv; 1482 grp = priv->mpcg; 1483 wch = priv->channel[WRITE]; 1484 rch = priv->channel[READ]; 1485 1486 switch (fsm_getstate(grp->fsm)) { 1487 case MPCG_STATE_XID2INITW: 1488 /* Unless there is outstanding IO on the */ 1489 /* channel just return and wait for ATTN */ 1490 /* interrupt to begin XID negotiations */ 1491 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1492 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1493 break; 1494 default: 1495 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1496 } 1497 1498 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1499 "%s: dev=%s exit", 1500 CTCM_FUNTAIL, dev->name); 1501 return; 1502 } 1503 1504 /* 1505 * MPC Group Station FSM action 1506 * CTCM_PROTO_MPC only 1507 */ 1508 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1509 { 1510 struct mpcg_info *mpcginfo = arg; 1511 struct channel *ch = mpcginfo->ch; 1512 struct net_device *dev; 1513 struct ctcm_priv *priv; 1514 struct mpc_group *grp; 1515 1516 if (ch) { 1517 dev = ch->netdev; 1518 if (dev) { 1519 priv = dev->ml_priv; 1520 if (priv) { 1521 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1522 "%s: %s: %s\n", 1523 CTCM_FUNTAIL, dev->name, ch->id); 1524 grp = priv->mpcg; 1525 grp->send_qllc_disc = 1; 1526 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1527 } 1528 } 1529 } 1530 1531 return; 1532 } 1533 1534 /* 1535 * MPC Group Station - not part of FSM 1536 * CTCM_PROTO_MPC only 1537 * called from add_channel in ctcm_main.c 1538 */ 1539 void mpc_action_send_discontact(unsigned long thischan) 1540 { 1541 int rc; 1542 struct channel *ch = (struct channel *)thischan; 1543 unsigned long saveflags = 0; 1544 1545 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1546 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 1547 (unsigned long)ch, 0xff, 0); 1548 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1549 1550 if (rc != 0) { 1551 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1552 } 1553 1554 return; 1555 } 1556 1557 1558 /* 1559 * helper function of mpc FSM 1560 * CTCM_PROTO_MPC only 1561 * mpc_action_rcvd_xid7 1562 */ 1563 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1564 { 1565 struct channel *ch = mpcginfo->ch; 1566 struct net_device *dev = ch->netdev; 1567 struct ctcm_priv *priv = dev->ml_priv; 1568 struct mpc_group *grp = priv->mpcg; 1569 struct xid2 *xid = mpcginfo->xid; 1570 int rc = 0; 1571 __u64 our_id = 0; 1572 __u64 their_id = 0; 1573 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1574 1575 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1576 1577 if (xid == NULL) { 1578 rc = 1; 1579 /* XID REJECTED: xid == NULL */ 1580 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1581 "%s(%s): xid = NULL", 1582 CTCM_FUNTAIL, ch->id); 1583 goto done; 1584 } 1585 1586 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1587 1588 /*the received direction should be the opposite of ours */ 1589 if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE : 1590 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1591 rc = 2; 1592 /* XID REJECTED: r/w channel pairing mismatch */ 1593 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1594 "%s(%s): r/w channel pairing mismatch", 1595 CTCM_FUNTAIL, ch->id); 1596 goto done; 1597 } 1598 1599 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1600 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1601 grp->group_max_buflen, xid->xid2_buf_len); 1602 1603 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1604 xid->xid2_buf_len - len) 1605 grp->group_max_buflen = xid->xid2_buf_len - len; 1606 } 1607 1608 if (grp->saved_xid2 == NULL) { 1609 grp->saved_xid2 = 1610 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1611 1612 memcpy(skb_put(grp->rcvd_xid_skb, 1613 XID2_LENGTH), xid, XID2_LENGTH); 1614 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1615 1616 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1617 grp->rcvd_xid_skb->len = 0; 1618 1619 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1620 our_id = (__u64)priv->xid->xid2_adj_id; 1621 our_id = our_id << 32; 1622 our_id = our_id + priv->xid->xid2_sender_id; 1623 their_id = (__u64)xid->xid2_adj_id; 1624 their_id = their_id << 32; 1625 their_id = their_id + xid->xid2_sender_id; 1626 /* lower id assume the xside role */ 1627 if (our_id < their_id) { 1628 grp->roll = XSIDE; 1629 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1630 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1631 CTCM_FUNTAIL, ch->id); 1632 } else { 1633 grp->roll = YSIDE; 1634 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1635 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1636 CTCM_FUNTAIL, ch->id); 1637 } 1638 1639 } else { 1640 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1641 rc = 3; 1642 /* XID REJECTED: xid flag byte4 mismatch */ 1643 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1644 "%s(%s): xid flag byte4 mismatch", 1645 CTCM_FUNTAIL, ch->id); 1646 } 1647 if (xid->xid2_flag2 == 0x40) { 1648 rc = 4; 1649 /* XID REJECTED - xid NOGOOD */ 1650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1651 "%s(%s): xid NOGOOD", 1652 CTCM_FUNTAIL, ch->id); 1653 } 1654 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1655 rc = 5; 1656 /* XID REJECTED - Adjacent Station ID Mismatch */ 1657 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1658 "%s(%s): Adjacent Station ID Mismatch", 1659 CTCM_FUNTAIL, ch->id); 1660 } 1661 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1662 rc = 6; 1663 /* XID REJECTED - Sender Address Mismatch */ 1664 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1665 "%s(%s): Sender Address Mismatch", 1666 CTCM_FUNTAIL, ch->id); 1667 } 1668 } 1669 done: 1670 if (rc) { 1671 dev_warn(&dev->dev, 1672 "The XID used in the MPC protocol is not valid, " 1673 "rc = %d\n", rc); 1674 priv->xid->xid2_flag2 = 0x40; 1675 grp->saved_xid2->xid2_flag2 = 0x40; 1676 } 1677 1678 return rc; 1679 } 1680 1681 /* 1682 * MPC Group Station FSM action 1683 * CTCM_PROTO_MPC only 1684 */ 1685 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1686 { 1687 struct channel *ch = arg; 1688 int rc = 0; 1689 int gotlock = 0; 1690 unsigned long saveflags = 0; /* avoids compiler warning with 1691 spin_unlock_irqrestore */ 1692 1693 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1694 __func__, smp_processor_id(), ch, ch->id); 1695 1696 if (ctcm_checkalloc_buffer(ch)) 1697 goto done; 1698 1699 /* 1700 * skb data-buffer referencing: 1701 */ 1702 ch->trans_skb->data = ch->trans_skb_data; 1703 skb_reset_tail_pointer(ch->trans_skb); 1704 ch->trans_skb->len = 0; 1705 /* result of the previous 3 statements is NOT always 1706 * already set after ctcm_checkalloc_buffer 1707 * because of possible reuse of the trans_skb 1708 */ 1709 memset(ch->trans_skb->data, 0, 16); 1710 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1711 /* check is main purpose here: */ 1712 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1713 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1714 /* check is main purpose here: */ 1715 skb_put(ch->trans_skb, XID2_LENGTH); 1716 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1717 /* cleanup back to startpoint */ 1718 ch->trans_skb->data = ch->trans_skb_data; 1719 skb_reset_tail_pointer(ch->trans_skb); 1720 ch->trans_skb->len = 0; 1721 1722 /* non-checking rewrite of above skb data-buffer referencing: */ 1723 /* 1724 memset(ch->trans_skb->data, 0, 16); 1725 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1726 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1727 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1728 */ 1729 1730 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1731 ch->ccw[8].count = 0; 1732 ch->ccw[8].cda = 0x00; 1733 1734 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1735 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1736 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1737 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1738 1739 if (side == XSIDE) { 1740 /* mpc_action_xside_xid */ 1741 if (ch->xid_th == NULL) 1742 goto done; 1743 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1744 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1745 ch->ccw[9].count = TH_HEADER_LENGTH; 1746 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1747 1748 if (ch->xid == NULL) 1749 goto done; 1750 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1751 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1752 ch->ccw[10].count = XID2_LENGTH; 1753 ch->ccw[10].cda = virt_to_phys(ch->xid); 1754 1755 ch->ccw[11].cmd_code = CCW_CMD_READ; 1756 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1757 ch->ccw[11].count = TH_HEADER_LENGTH; 1758 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1759 1760 ch->ccw[12].cmd_code = CCW_CMD_READ; 1761 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1762 ch->ccw[12].count = XID2_LENGTH; 1763 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1764 1765 ch->ccw[13].cmd_code = CCW_CMD_READ; 1766 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1767 1768 } else { /* side == YSIDE : mpc_action_yside_xid */ 1769 ch->ccw[9].cmd_code = CCW_CMD_READ; 1770 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1771 ch->ccw[9].count = TH_HEADER_LENGTH; 1772 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1773 1774 ch->ccw[10].cmd_code = CCW_CMD_READ; 1775 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1776 ch->ccw[10].count = XID2_LENGTH; 1777 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1778 1779 if (ch->xid_th == NULL) 1780 goto done; 1781 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1782 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1783 ch->ccw[11].count = TH_HEADER_LENGTH; 1784 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1785 1786 if (ch->xid == NULL) 1787 goto done; 1788 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1789 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1790 ch->ccw[12].count = XID2_LENGTH; 1791 ch->ccw[12].cda = virt_to_phys(ch->xid); 1792 1793 if (ch->xid_id == NULL) 1794 goto done; 1795 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1796 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1797 1798 } 1799 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1800 ch->ccw[13].count = 4; 1801 1802 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1803 ch->ccw[14].flags = CCW_FLAG_SLI; 1804 ch->ccw[14].count = 0; 1805 ch->ccw[14].cda = 0; 1806 1807 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1808 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1809 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1810 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1811 1812 if (!in_irq()) { 1813 /* Such conditional locking is a known problem for 1814 * sparse because its static undeterministic. 1815 * Warnings should be ignored here. */ 1816 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1817 gotlock = 1; 1818 } 1819 1820 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1821 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 1822 (unsigned long)ch, 0xff, 0); 1823 1824 if (gotlock) /* see remark above about conditional locking */ 1825 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1826 1827 if (rc != 0) { 1828 ctcm_ccw_check_rc(ch, rc, 1829 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1830 } 1831 1832 done: 1833 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1834 __func__, ch, ch->id); 1835 return; 1836 1837 } 1838 1839 /* 1840 * MPC Group Station FSM action 1841 * CTCM_PROTO_MPC only 1842 */ 1843 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1844 { 1845 mpc_action_side_xid(fsm, arg, XSIDE); 1846 } 1847 1848 /* 1849 * MPC Group Station FSM action 1850 * CTCM_PROTO_MPC only 1851 */ 1852 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1853 { 1854 mpc_action_side_xid(fsm, arg, YSIDE); 1855 } 1856 1857 /* 1858 * MPC Group Station FSM action 1859 * CTCM_PROTO_MPC only 1860 */ 1861 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1862 { 1863 struct channel *ch = arg; 1864 struct net_device *dev = ch->netdev; 1865 struct ctcm_priv *priv = dev->ml_priv; 1866 struct mpc_group *grp = priv->mpcg; 1867 1868 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1869 __func__, smp_processor_id(), ch, ch->id); 1870 1871 if (ch->xid == NULL) { 1872 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1873 "%s(%s): ch->xid == NULL", 1874 CTCM_FUNTAIL, dev->name); 1875 return; 1876 } 1877 1878 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1879 1880 ch->xid->xid2_option = XID2_0; 1881 1882 switch (fsm_getstate(grp->fsm)) { 1883 case MPCG_STATE_XID2INITW: 1884 case MPCG_STATE_XID2INITX: 1885 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1886 break; 1887 case MPCG_STATE_XID0IOWAIT: 1888 case MPCG_STATE_XID0IOWAIX: 1889 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1890 break; 1891 } 1892 1893 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1894 1895 return; 1896 } 1897 1898 /* 1899 * MPC Group Station FSM action 1900 * CTCM_PROTO_MPC only 1901 */ 1902 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1903 { 1904 struct net_device *dev = arg; 1905 struct ctcm_priv *priv = dev->ml_priv; 1906 struct mpc_group *grp = NULL; 1907 int direction; 1908 int send = 0; 1909 1910 if (priv) 1911 grp = priv->mpcg; 1912 if (grp == NULL) 1913 return; 1914 1915 for (direction = READ; direction <= WRITE; direction++) { 1916 struct channel *ch = priv->channel[direction]; 1917 struct xid2 *thisxid = ch->xid; 1918 ch->xid_skb->data = ch->xid_skb_data; 1919 skb_reset_tail_pointer(ch->xid_skb); 1920 ch->xid_skb->len = 0; 1921 thisxid->xid2_option = XID2_7; 1922 send = 0; 1923 1924 /* xid7 phase 1 */ 1925 if (grp->outstanding_xid7_p2 > 0) { 1926 if (grp->roll == YSIDE) { 1927 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1928 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1929 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1930 memcpy(skb_put(ch->xid_skb, 1931 TH_HEADER_LENGTH), 1932 &thdummy, TH_HEADER_LENGTH); 1933 send = 1; 1934 } 1935 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1936 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1937 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1938 memcpy(skb_put(ch->xid_skb, 1939 TH_HEADER_LENGTH), 1940 &thnorm, TH_HEADER_LENGTH); 1941 send = 1; 1942 } 1943 } else { 1944 /* xid7 phase 2 */ 1945 if (grp->roll == YSIDE) { 1946 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1947 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1948 memcpy(skb_put(ch->xid_skb, 1949 TH_HEADER_LENGTH), 1950 &thnorm, TH_HEADER_LENGTH); 1951 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1952 send = 1; 1953 } 1954 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1955 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1956 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1957 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH), 1958 &thdummy, TH_HEADER_LENGTH); 1959 send = 1; 1960 } 1961 } 1962 1963 if (send) 1964 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1965 } 1966 1967 return; 1968 } 1969 1970 /* 1971 * MPC Group Station FSM action 1972 * CTCM_PROTO_MPC only 1973 */ 1974 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1975 { 1976 1977 struct mpcg_info *mpcginfo = arg; 1978 struct channel *ch = mpcginfo->ch; 1979 struct net_device *dev = ch->netdev; 1980 struct ctcm_priv *priv = dev->ml_priv; 1981 struct mpc_group *grp = priv->mpcg; 1982 1983 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1984 __func__, ch->id, grp->outstanding_xid2, 1985 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1986 1987 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1988 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1989 1990 grp->outstanding_xid2--; 1991 grp->outstanding_xid7++; 1992 grp->outstanding_xid7_p2++; 1993 1994 /* must change state before validating xid to */ 1995 /* properly handle interim interrupts received*/ 1996 switch (fsm_getstate(grp->fsm)) { 1997 case MPCG_STATE_XID2INITW: 1998 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1999 mpc_validate_xid(mpcginfo); 2000 break; 2001 case MPCG_STATE_XID0IOWAIT: 2002 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 2003 mpc_validate_xid(mpcginfo); 2004 break; 2005 case MPCG_STATE_XID2INITX: 2006 if (grp->outstanding_xid2 == 0) { 2007 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 2008 mpc_validate_xid(mpcginfo); 2009 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2010 } 2011 break; 2012 case MPCG_STATE_XID0IOWAIX: 2013 if (grp->outstanding_xid2 == 0) { 2014 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 2015 mpc_validate_xid(mpcginfo); 2016 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 2017 } 2018 break; 2019 } 2020 kfree(mpcginfo); 2021 2022 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 2023 __func__, ch->id, grp->outstanding_xid2, 2024 grp->outstanding_xid7, grp->outstanding_xid7_p2); 2025 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 2026 __func__, ch->id, 2027 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 2028 return; 2029 2030 } 2031 2032 2033 /* 2034 * MPC Group Station FSM action 2035 * CTCM_PROTO_MPC only 2036 */ 2037 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2038 { 2039 struct mpcg_info *mpcginfo = arg; 2040 struct channel *ch = mpcginfo->ch; 2041 struct net_device *dev = ch->netdev; 2042 struct ctcm_priv *priv = dev->ml_priv; 2043 struct mpc_group *grp = priv->mpcg; 2044 2045 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2046 __func__, smp_processor_id(), ch, ch->id); 2047 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2048 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2049 2050 grp->outstanding_xid7--; 2051 ch->xid_skb->data = ch->xid_skb_data; 2052 skb_reset_tail_pointer(ch->xid_skb); 2053 ch->xid_skb->len = 0; 2054 2055 switch (fsm_getstate(grp->fsm)) { 2056 case MPCG_STATE_XID7INITI: 2057 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2058 mpc_validate_xid(mpcginfo); 2059 break; 2060 case MPCG_STATE_XID7INITW: 2061 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2062 mpc_validate_xid(mpcginfo); 2063 break; 2064 case MPCG_STATE_XID7INITZ: 2065 case MPCG_STATE_XID7INITX: 2066 if (grp->outstanding_xid7 == 0) { 2067 if (grp->outstanding_xid7_p2 > 0) { 2068 grp->outstanding_xid7 = 2069 grp->outstanding_xid7_p2; 2070 grp->outstanding_xid7_p2 = 0; 2071 } else 2072 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2073 2074 mpc_validate_xid(mpcginfo); 2075 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2076 break; 2077 } 2078 mpc_validate_xid(mpcginfo); 2079 break; 2080 } 2081 kfree(mpcginfo); 2082 return; 2083 } 2084 2085 /* 2086 * mpc_action helper of an MPC Group Station FSM action 2087 * CTCM_PROTO_MPC only 2088 */ 2089 static int mpc_send_qllc_discontact(struct net_device *dev) 2090 { 2091 __u32 new_len = 0; 2092 struct sk_buff *skb; 2093 struct qllc *qllcptr; 2094 struct ctcm_priv *priv = dev->ml_priv; 2095 struct mpc_group *grp = priv->mpcg; 2096 2097 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2098 __func__, mpcg_state_names[grp->saved_state]); 2099 2100 switch (grp->saved_state) { 2101 /* 2102 * establish conn callback function is 2103 * preferred method to report failure 2104 */ 2105 case MPCG_STATE_XID0IOWAIT: 2106 case MPCG_STATE_XID0IOWAIX: 2107 case MPCG_STATE_XID7INITI: 2108 case MPCG_STATE_XID7INITZ: 2109 case MPCG_STATE_XID2INITW: 2110 case MPCG_STATE_XID2INITX: 2111 case MPCG_STATE_XID7INITW: 2112 case MPCG_STATE_XID7INITX: 2113 if (grp->estconnfunc) { 2114 grp->estconnfunc(grp->port_num, -1, 0); 2115 grp->estconnfunc = NULL; 2116 break; 2117 } 2118 case MPCG_STATE_FLOWC: 2119 case MPCG_STATE_READY: 2120 grp->send_qllc_disc = 2; 2121 new_len = sizeof(struct qllc); 2122 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2123 if (qllcptr == NULL) { 2124 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2125 "%s(%s): qllcptr allocation error", 2126 CTCM_FUNTAIL, dev->name); 2127 return -ENOMEM; 2128 } 2129 2130 qllcptr->qllc_address = 0xcc; 2131 qllcptr->qllc_commands = 0x03; 2132 2133 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2134 2135 if (skb == NULL) { 2136 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2137 "%s(%s): skb allocation error", 2138 CTCM_FUNTAIL, dev->name); 2139 priv->stats.rx_dropped++; 2140 kfree(qllcptr); 2141 return -ENOMEM; 2142 } 2143 2144 memcpy(skb_put(skb, new_len), qllcptr, new_len); 2145 kfree(qllcptr); 2146 2147 if (skb_headroom(skb) < 4) { 2148 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2149 "%s(%s): skb_headroom error", 2150 CTCM_FUNTAIL, dev->name); 2151 dev_kfree_skb_any(skb); 2152 return -ENOMEM; 2153 } 2154 2155 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq; 2156 priv->channel[READ]->pdu_seq++; 2157 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2158 __func__, priv->channel[READ]->pdu_seq); 2159 2160 /* receipt of CC03 resets anticipated sequence number on 2161 receiving side */ 2162 priv->channel[READ]->pdu_seq = 0x00; 2163 skb_reset_mac_header(skb); 2164 skb->dev = dev; 2165 skb->protocol = htons(ETH_P_SNAP); 2166 skb->ip_summed = CHECKSUM_UNNECESSARY; 2167 2168 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2169 2170 netif_rx(skb); 2171 break; 2172 default: 2173 break; 2174 2175 } 2176 2177 return 0; 2178 } 2179 /* --- This is the END my friend --- */ 2180 2181