1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright IBM Corp. 2004, 2007 4 * Authors: Belinda Thompson (belindat@us.ibm.com) 5 * Andy Richter (richtera@us.ibm.com) 6 * Peter Tiedemann (ptiedem@de.ibm.com) 7 */ 8 9 /* 10 This module exports functions to be used by CCS: 11 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 12 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 13 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 14 EXPORT_SYMBOL(ctc_mpc_flow_control); 15 */ 16 17 #undef DEBUG 18 #undef DEBUGDATA 19 #undef DEBUGCCW 20 21 #define KMSG_COMPONENT "ctcm" 22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/kernel.h> 27 #include <linux/slab.h> 28 #include <linux/errno.h> 29 #include <linux/types.h> 30 #include <linux/interrupt.h> 31 #include <linux/timer.h> 32 #include <linux/sched.h> 33 34 #include <linux/signal.h> 35 #include <linux/string.h> 36 #include <linux/proc_fs.h> 37 38 #include <linux/ip.h> 39 #include <linux/if_arp.h> 40 #include <linux/tcp.h> 41 #include <linux/skbuff.h> 42 #include <linux/ctype.h> 43 #include <linux/netdevice.h> 44 #include <net/dst.h> 45 46 #include <linux/io.h> /* instead of <asm/io.h> ok ? */ 47 #include <asm/ccwdev.h> 48 #include <asm/ccwgroup.h> 49 #include <linux/bitops.h> /* instead of <asm/bitops.h> ok ? */ 50 #include <linux/uaccess.h> /* instead of <asm/uaccess.h> ok ? */ 51 #include <linux/wait.h> 52 #include <linux/moduleparam.h> 53 #include <asm/idals.h> 54 55 #include "ctcm_main.h" 56 #include "ctcm_mpc.h" 57 #include "ctcm_fsms.h" 58 59 static const struct xid2 init_xid = { 60 .xid2_type_id = XID_FM2, 61 .xid2_len = 0x45, 62 .xid2_adj_id = 0, 63 .xid2_rlen = 0x31, 64 .xid2_resv1 = 0, 65 .xid2_flag1 = 0, 66 .xid2_fmtt = 0, 67 .xid2_flag4 = 0x80, 68 .xid2_resv2 = 0, 69 .xid2_tgnum = 0, 70 .xid2_sender_id = 0, 71 .xid2_flag2 = 0, 72 .xid2_option = XID2_0, 73 .xid2_resv3 = "\x00", 74 .xid2_resv4 = 0, 75 .xid2_dlc_type = XID2_READ_SIDE, 76 .xid2_resv5 = 0, 77 .xid2_mpc_flag = 0, 78 .xid2_resv6 = 0, 79 .xid2_buf_len = (MPC_BUFSIZE_DEFAULT - 35), 80 }; 81 82 static const struct th_header thnorm = { 83 .th_seg = 0x00, 84 .th_ch_flag = TH_IS_XID, 85 .th_blk_flag = TH_DATA_IS_XID, 86 .th_is_xid = 0x01, 87 .th_seq_num = 0x00000000, 88 }; 89 90 static const struct th_header thdummy = { 91 .th_seg = 0x00, 92 .th_ch_flag = 0x00, 93 .th_blk_flag = TH_DATA_IS_XID, 94 .th_is_xid = 0x01, 95 .th_seq_num = 0x00000000, 96 }; 97 98 /* 99 * Definition of one MPC group 100 */ 101 102 /* 103 * Compatibility macros for busy handling 104 * of network devices. 105 */ 106 107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 108 109 /* 110 * MPC Group state machine actions (static prototypes) 111 */ 112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 116 static int mpc_validate_xid(struct mpcg_info *mpcginfo); 117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 123 124 #ifdef DEBUGDATA 125 /*-------------------------------------------------------------------* 126 * Dump buffer format * 127 * * 128 *--------------------------------------------------------------------*/ 129 void ctcmpc_dumpit(char *buf, int len) 130 { 131 __u32 ct, sw, rm, dup; 132 char *ptr, *rptr; 133 char tbuf[82], tdup[82]; 134 char addr[22]; 135 char boff[12]; 136 char bhex[82], duphex[82]; 137 char basc[40]; 138 139 sw = 0; 140 rptr = ptr = buf; 141 rm = 16; 142 duphex[0] = 0x00; 143 dup = 0; 144 145 for (ct = 0; ct < len; ct++, ptr++, rptr++) { 146 if (sw == 0) { 147 sprintf(addr, "%16.16llx", (__u64)rptr); 148 149 sprintf(boff, "%4.4X", (__u32)ct); 150 bhex[0] = '\0'; 151 basc[0] = '\0'; 152 } 153 if ((sw == 4) || (sw == 12)) 154 strcat(bhex, " "); 155 if (sw == 8) 156 strcat(bhex, " "); 157 158 sprintf(tbuf, "%2.2llX", (__u64)*ptr); 159 160 tbuf[2] = '\0'; 161 strcat(bhex, tbuf); 162 if ((0 != isprint(*ptr)) && (*ptr >= 0x20)) 163 basc[sw] = *ptr; 164 else 165 basc[sw] = '.'; 166 167 basc[sw+1] = '\0'; 168 sw++; 169 rm--; 170 if (sw != 16) 171 continue; 172 if ((strcmp(duphex, bhex)) != 0) { 173 if (dup != 0) { 174 sprintf(tdup, 175 "Duplicate as above to %s", addr); 176 ctcm_pr_debug(" --- %s ---\n", 177 tdup); 178 } 179 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 180 addr, boff, bhex, basc); 181 dup = 0; 182 strcpy(duphex, bhex); 183 } else 184 dup++; 185 186 sw = 0; 187 rm = 16; 188 } /* endfor */ 189 190 if (sw != 0) { 191 for ( ; rm > 0; rm--, sw++) { 192 if ((sw == 4) || (sw == 12)) 193 strcat(bhex, " "); 194 if (sw == 8) 195 strcat(bhex, " "); 196 strcat(bhex, " "); 197 strcat(basc, " "); 198 } 199 if (dup != 0) { 200 sprintf(tdup, "Duplicate as above to %s", addr); 201 ctcm_pr_debug(" --- %s ---\n", tdup); 202 } 203 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 204 addr, boff, bhex, basc); 205 } else { 206 if (dup >= 1) { 207 sprintf(tdup, "Duplicate as above to %s", addr); 208 ctcm_pr_debug(" --- %s ---\n", tdup); 209 } 210 if (dup != 0) { 211 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 212 addr, boff, bhex, basc); 213 } 214 } 215 216 return; 217 218 } /* end of ctcmpc_dumpit */ 219 #endif 220 221 #ifdef DEBUGDATA 222 /* 223 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 224 * 225 * skb The sk_buff to dump. 226 * offset Offset relative to skb-data, where to start the dump. 227 */ 228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 229 { 230 __u8 *p = skb->data; 231 struct th_header *header; 232 struct pdu *pheader; 233 int bl = skb->len; 234 int i; 235 236 if (p == NULL) 237 return; 238 239 p += offset; 240 header = (struct th_header *)p; 241 242 ctcm_pr_debug("dump:\n"); 243 ctcm_pr_debug("skb len=%d \n", skb->len); 244 if (skb->len > 2) { 245 switch (header->th_ch_flag) { 246 case TH_HAS_PDU: 247 break; 248 case 0x00: 249 case TH_IS_XID: 250 if ((header->th_blk_flag == TH_DATA_IS_XID) && 251 (header->th_is_xid == 0x01)) 252 goto dumpth; 253 case TH_SWEEP_REQ: 254 goto dumpth; 255 case TH_SWEEP_RESP: 256 goto dumpth; 257 default: 258 break; 259 } 260 261 pheader = (struct pdu *)p; 262 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 263 pheader->pdu_offset, pheader->pdu_offset); 264 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 265 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 266 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 267 goto dumpdata; 268 269 dumpth: 270 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 271 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 272 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 273 ctcm_pr_debug("th->type : %s\n", 274 (header->th_is_xid) ? "DATA" : "XID"); 275 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 276 277 } 278 dumpdata: 279 if (bl > 32) 280 bl = 32; 281 ctcm_pr_debug("data: "); 282 for (i = 0; i < bl; i++) 283 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 284 ctcm_pr_debug("\n"); 285 } 286 #endif 287 288 static struct net_device *ctcmpc_get_dev(int port_num) 289 { 290 char device[20]; 291 struct net_device *dev; 292 struct ctcm_priv *priv; 293 294 sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num); 295 296 dev = __dev_get_by_name(&init_net, device); 297 298 if (dev == NULL) { 299 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 300 "%s: Device not found by name: %s", 301 CTCM_FUNTAIL, device); 302 return NULL; 303 } 304 priv = dev->ml_priv; 305 if (priv == NULL) { 306 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 307 "%s(%s): dev->ml_priv is NULL", 308 CTCM_FUNTAIL, device); 309 return NULL; 310 } 311 if (priv->mpcg == NULL) { 312 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 313 "%s(%s): priv->mpcg is NULL", 314 CTCM_FUNTAIL, device); 315 return NULL; 316 } 317 return dev; 318 } 319 320 /* 321 * ctc_mpc_alloc_channel 322 * (exported interface) 323 * 324 * Device Initialization : 325 * ACTPATH driven IO operations 326 */ 327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 328 { 329 struct net_device *dev; 330 struct mpc_group *grp; 331 struct ctcm_priv *priv; 332 333 dev = ctcmpc_get_dev(port_num); 334 if (dev == NULL) 335 return 1; 336 priv = dev->ml_priv; 337 grp = priv->mpcg; 338 339 grp->allochanfunc = callback; 340 grp->port_num = port_num; 341 grp->port_persist = 1; 342 343 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 344 "%s(%s): state=%s", 345 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 346 347 switch (fsm_getstate(grp->fsm)) { 348 case MPCG_STATE_INOP: 349 /* Group is in the process of terminating */ 350 grp->alloc_called = 1; 351 break; 352 case MPCG_STATE_RESET: 353 /* MPC Group will transition to state */ 354 /* MPCG_STATE_XID2INITW iff the minimum number */ 355 /* of 1 read and 1 write channel have successfully*/ 356 /* activated */ 357 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 358 if (callback) 359 grp->send_qllc_disc = 1; 360 fallthrough; 361 case MPCG_STATE_XID0IOWAIT: 362 fsm_deltimer(&grp->timer); 363 grp->outstanding_xid2 = 0; 364 grp->outstanding_xid7 = 0; 365 grp->outstanding_xid7_p2 = 0; 366 grp->saved_xid2 = NULL; 367 if (callback) 368 ctcm_open(dev); 369 fsm_event(priv->fsm, DEV_EVENT_START, dev); 370 break; 371 case MPCG_STATE_READY: 372 /* XID exchanges completed after PORT was activated */ 373 /* Link station already active */ 374 /* Maybe timing issue...retry callback */ 375 grp->allocchan_callback_retries++; 376 if (grp->allocchan_callback_retries < 4) { 377 if (grp->allochanfunc) 378 grp->allochanfunc(grp->port_num, 379 grp->group_max_buflen); 380 } else { 381 /* there are problems...bail out */ 382 /* there may be a state mismatch so restart */ 383 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 384 grp->allocchan_callback_retries = 0; 385 } 386 break; 387 } 388 389 return 0; 390 } 391 EXPORT_SYMBOL(ctc_mpc_alloc_channel); 392 393 /* 394 * ctc_mpc_establish_connectivity 395 * (exported interface) 396 */ 397 void ctc_mpc_establish_connectivity(int port_num, 398 void (*callback)(int, int, int)) 399 { 400 struct net_device *dev; 401 struct mpc_group *grp; 402 struct ctcm_priv *priv; 403 struct channel *rch, *wch; 404 405 dev = ctcmpc_get_dev(port_num); 406 if (dev == NULL) 407 return; 408 priv = dev->ml_priv; 409 grp = priv->mpcg; 410 rch = priv->channel[CTCM_READ]; 411 wch = priv->channel[CTCM_WRITE]; 412 413 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 414 "%s(%s): state=%s", 415 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 416 417 grp->estconnfunc = callback; 418 grp->port_num = port_num; 419 420 switch (fsm_getstate(grp->fsm)) { 421 case MPCG_STATE_READY: 422 /* XID exchanges completed after PORT was activated */ 423 /* Link station already active */ 424 /* Maybe timing issue...retry callback */ 425 fsm_deltimer(&grp->timer); 426 grp->estconn_callback_retries++; 427 if (grp->estconn_callback_retries < 4) { 428 if (grp->estconnfunc) { 429 grp->estconnfunc(grp->port_num, 0, 430 grp->group_max_buflen); 431 grp->estconnfunc = NULL; 432 } 433 } else { 434 /* there are problems...bail out */ 435 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 436 grp->estconn_callback_retries = 0; 437 } 438 break; 439 case MPCG_STATE_INOP: 440 case MPCG_STATE_RESET: 441 /* MPC Group is not ready to start XID - min num of */ 442 /* 1 read and 1 write channel have not been acquired*/ 443 444 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 445 "%s(%s): REJECTED - inactive channels", 446 CTCM_FUNTAIL, dev->name); 447 if (grp->estconnfunc) { 448 grp->estconnfunc(grp->port_num, -1, 0); 449 grp->estconnfunc = NULL; 450 } 451 break; 452 case MPCG_STATE_XID2INITW: 453 /* alloc channel was called but no XID exchange */ 454 /* has occurred. initiate xside XID exchange */ 455 /* make sure yside XID0 processing has not started */ 456 457 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 458 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 459 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 460 "%s(%s): ABORT - PASSIVE XID", 461 CTCM_FUNTAIL, dev->name); 462 break; 463 } 464 grp->send_qllc_disc = 1; 465 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 466 fsm_deltimer(&grp->timer); 467 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 468 MPCG_EVENT_TIMER, dev); 469 grp->outstanding_xid7 = 0; 470 grp->outstanding_xid7_p2 = 0; 471 grp->saved_xid2 = NULL; 472 if ((rch->in_mpcgroup) && 473 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 474 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 475 else { 476 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 477 "%s(%s): RX-%s not ready for ACTIVE XID0", 478 CTCM_FUNTAIL, dev->name, rch->id); 479 if (grp->estconnfunc) { 480 grp->estconnfunc(grp->port_num, -1, 0); 481 grp->estconnfunc = NULL; 482 } 483 fsm_deltimer(&grp->timer); 484 goto done; 485 } 486 if ((wch->in_mpcgroup) && 487 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 488 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 489 else { 490 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 491 "%s(%s): WX-%s not ready for ACTIVE XID0", 492 CTCM_FUNTAIL, dev->name, wch->id); 493 if (grp->estconnfunc) { 494 grp->estconnfunc(grp->port_num, -1, 0); 495 grp->estconnfunc = NULL; 496 } 497 fsm_deltimer(&grp->timer); 498 goto done; 499 } 500 break; 501 case MPCG_STATE_XID0IOWAIT: 502 /* already in active XID negotiations */ 503 default: 504 break; 505 } 506 507 done: 508 CTCM_PR_DEBUG("Exit %s()\n", __func__); 509 return; 510 } 511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 512 513 /* 514 * ctc_mpc_dealloc_ch 515 * (exported interface) 516 */ 517 void ctc_mpc_dealloc_ch(int port_num) 518 { 519 struct net_device *dev; 520 struct ctcm_priv *priv; 521 struct mpc_group *grp; 522 523 dev = ctcmpc_get_dev(port_num); 524 if (dev == NULL) 525 return; 526 priv = dev->ml_priv; 527 grp = priv->mpcg; 528 529 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 530 "%s: %s: refcount = %d\n", 531 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 532 533 fsm_deltimer(&priv->restart_timer); 534 grp->channels_terminating = 0; 535 fsm_deltimer(&grp->timer); 536 grp->allochanfunc = NULL; 537 grp->estconnfunc = NULL; 538 grp->port_persist = 0; 539 grp->send_qllc_disc = 0; 540 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 541 542 ctcm_close(dev); 543 return; 544 } 545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 546 547 /* 548 * ctc_mpc_flow_control 549 * (exported interface) 550 */ 551 void ctc_mpc_flow_control(int port_num, int flowc) 552 { 553 struct ctcm_priv *priv; 554 struct mpc_group *grp; 555 struct net_device *dev; 556 struct channel *rch; 557 int mpcg_state; 558 559 dev = ctcmpc_get_dev(port_num); 560 if (dev == NULL) 561 return; 562 priv = dev->ml_priv; 563 grp = priv->mpcg; 564 565 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 566 "%s: %s: flowc = %d", 567 CTCM_FUNTAIL, dev->name, flowc); 568 569 rch = priv->channel[CTCM_READ]; 570 571 mpcg_state = fsm_getstate(grp->fsm); 572 switch (flowc) { 573 case 1: 574 if (mpcg_state == MPCG_STATE_FLOWC) 575 break; 576 if (mpcg_state == MPCG_STATE_READY) { 577 if (grp->flow_off_called == 1) 578 grp->flow_off_called = 0; 579 else 580 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 581 break; 582 } 583 break; 584 case 0: 585 if (mpcg_state == MPCG_STATE_FLOWC) { 586 fsm_newstate(grp->fsm, MPCG_STATE_READY); 587 /* ensure any data that has accumulated */ 588 /* on the io_queue will now be sen t */ 589 tasklet_schedule(&rch->ch_tasklet); 590 } 591 /* possible race condition */ 592 if (mpcg_state == MPCG_STATE_READY) { 593 grp->flow_off_called = 1; 594 break; 595 } 596 break; 597 } 598 599 } 600 EXPORT_SYMBOL(ctc_mpc_flow_control); 601 602 static int mpc_send_qllc_discontact(struct net_device *); 603 604 /* 605 * helper function of ctcmpc_unpack_skb 606 */ 607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 608 { 609 struct channel *rch = mpcginfo->ch; 610 struct net_device *dev = rch->netdev; 611 struct ctcm_priv *priv = dev->ml_priv; 612 struct mpc_group *grp = priv->mpcg; 613 struct channel *ch = priv->channel[CTCM_WRITE]; 614 615 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 616 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 617 618 grp->sweep_rsp_pend_num--; 619 620 if ((grp->sweep_req_pend_num == 0) && 621 (grp->sweep_rsp_pend_num == 0)) { 622 fsm_deltimer(&ch->sweep_timer); 623 grp->in_sweep = 0; 624 rch->th_seq_num = 0x00; 625 ch->th_seq_num = 0x00; 626 ctcm_clear_busy_do(dev); 627 } 628 629 return; 630 631 } 632 633 /* 634 * helper function of mpc_rcvd_sweep_req 635 * which is a helper of ctcmpc_unpack_skb 636 */ 637 static void ctcmpc_send_sweep_resp(struct channel *rch) 638 { 639 struct net_device *dev = rch->netdev; 640 struct ctcm_priv *priv = dev->ml_priv; 641 struct mpc_group *grp = priv->mpcg; 642 struct th_sweep *header; 643 struct sk_buff *sweep_skb; 644 struct channel *ch = priv->channel[CTCM_WRITE]; 645 646 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 647 648 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 649 if (sweep_skb == NULL) { 650 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 651 "%s(%s): sweep_skb allocation ERROR\n", 652 CTCM_FUNTAIL, rch->id); 653 goto done; 654 } 655 656 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH); 657 header->th.th_ch_flag = TH_SWEEP_RESP; 658 header->sw.th_last_seq = ch->th_seq_num; 659 660 netif_trans_update(dev); 661 skb_queue_tail(&ch->sweep_queue, sweep_skb); 662 663 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 664 665 return; 666 667 done: 668 grp->in_sweep = 0; 669 ctcm_clear_busy_do(dev); 670 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 671 672 return; 673 } 674 675 /* 676 * helper function of ctcmpc_unpack_skb 677 */ 678 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 679 { 680 struct channel *rch = mpcginfo->ch; 681 struct net_device *dev = rch->netdev; 682 struct ctcm_priv *priv = dev->ml_priv; 683 struct mpc_group *grp = priv->mpcg; 684 struct channel *ch = priv->channel[CTCM_WRITE]; 685 686 if (do_debug) 687 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 688 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 689 690 if (grp->in_sweep == 0) { 691 grp->in_sweep = 1; 692 ctcm_test_and_set_busy(dev); 693 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 694 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 695 } 696 697 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 698 699 grp->sweep_req_pend_num--; 700 ctcmpc_send_sweep_resp(ch); 701 kfree(mpcginfo); 702 return; 703 } 704 705 /* 706 * MPC Group Station FSM definitions 707 */ 708 static const char *mpcg_event_names[] = { 709 [MPCG_EVENT_INOP] = "INOP Condition", 710 [MPCG_EVENT_DISCONC] = "Discontact Received", 711 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 712 [MPCG_EVENT_XID2] = "XID2 Received", 713 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 714 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 715 [MPCG_EVENT_TIMER] = "XID Setup Timer", 716 [MPCG_EVENT_DOIO] = "XID DoIO", 717 }; 718 719 static const char *mpcg_state_names[] = { 720 [MPCG_STATE_RESET] = "Reset", 721 [MPCG_STATE_INOP] = "INOP", 722 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 723 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 724 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 725 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 726 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 727 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 728 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 729 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 730 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 731 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 732 [MPCG_STATE_READY] = "READY", 733 }; 734 735 /* 736 * The MPC Group Station FSM 737 * 22 events 738 */ 739 static const fsm_node mpcg_fsm[] = { 740 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 741 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 742 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 743 744 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 745 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 746 747 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 748 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 749 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 750 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 751 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 752 753 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 754 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 755 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 756 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 757 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 758 759 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 760 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 761 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 762 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 763 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 764 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 765 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 766 767 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 768 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 769 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 770 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 771 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 772 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 773 774 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 775 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 776 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 777 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 778 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 779 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 780 781 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 782 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 783 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 784 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 785 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 786 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 787 788 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 789 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 790 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 791 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 792 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 793 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 794 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 795 796 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 797 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 798 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 799 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 800 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 801 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 802 803 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 804 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 805 }; 806 807 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 808 809 /* 810 * MPC Group Station FSM action 811 * CTCM_PROTO_MPC only 812 */ 813 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 814 { 815 struct net_device *dev = arg; 816 struct ctcm_priv *priv = dev->ml_priv; 817 struct mpc_group *grp = priv->mpcg; 818 819 if (grp == NULL) { 820 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 821 "%s(%s): No MPC group", 822 CTCM_FUNTAIL, dev->name); 823 return; 824 } 825 826 fsm_deltimer(&grp->timer); 827 828 if (grp->saved_xid2->xid2_flag2 == 0x40) { 829 priv->xid->xid2_flag2 = 0x00; 830 if (grp->estconnfunc) { 831 grp->estconnfunc(grp->port_num, 1, 832 grp->group_max_buflen); 833 grp->estconnfunc = NULL; 834 } else if (grp->allochanfunc) 835 grp->send_qllc_disc = 1; 836 837 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 838 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 839 "%s(%s): fails", 840 CTCM_FUNTAIL, dev->name); 841 return; 842 } 843 844 grp->port_persist = 1; 845 grp->out_of_sequence = 0; 846 grp->estconn_called = 0; 847 848 tasklet_hi_schedule(&grp->mpc_tasklet2); 849 850 return; 851 } 852 853 /* 854 * helper of ctcm_init_netdevice 855 * CTCM_PROTO_MPC only 856 */ 857 void mpc_group_ready(unsigned long adev) 858 { 859 struct net_device *dev = (struct net_device *)adev; 860 struct ctcm_priv *priv = dev->ml_priv; 861 struct mpc_group *grp = priv->mpcg; 862 struct channel *ch = NULL; 863 864 if (grp == NULL) { 865 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 866 "%s(%s): No MPC group", 867 CTCM_FUNTAIL, dev->name); 868 return; 869 } 870 871 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 872 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 873 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 874 875 fsm_newstate(grp->fsm, MPCG_STATE_READY); 876 877 /* Put up a read on the channel */ 878 ch = priv->channel[CTCM_READ]; 879 ch->pdu_seq = 0; 880 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 881 __func__, ch->pdu_seq); 882 883 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 884 /* Put the write channel in idle state */ 885 ch = priv->channel[CTCM_WRITE]; 886 if (ch->collect_len > 0) { 887 spin_lock(&ch->collect_lock); 888 ctcm_purge_skb_queue(&ch->collect_queue); 889 ch->collect_len = 0; 890 spin_unlock(&ch->collect_lock); 891 } 892 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 893 ctcm_clear_busy(dev); 894 895 if (grp->estconnfunc) { 896 grp->estconnfunc(grp->port_num, 0, 897 grp->group_max_buflen); 898 grp->estconnfunc = NULL; 899 } else if (grp->allochanfunc) { 900 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 901 } 902 903 grp->send_qllc_disc = 1; 904 grp->changed_side = 0; 905 906 return; 907 908 } 909 910 /* 911 * Increment the MPC Group Active Channel Counts 912 * helper of dev_action (called from channel fsm) 913 */ 914 void mpc_channel_action(struct channel *ch, int direction, int action) 915 { 916 struct net_device *dev = ch->netdev; 917 struct ctcm_priv *priv = dev->ml_priv; 918 struct mpc_group *grp = priv->mpcg; 919 920 if (grp == NULL) { 921 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 922 "%s(%s): No MPC group", 923 CTCM_FUNTAIL, dev->name); 924 return; 925 } 926 927 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 928 929 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 930 "%s: %i / Grp:%s total_channels=%i, active_channels: " 931 "read=%i, write=%i\n", __func__, action, 932 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 933 grp->active_channels[CTCM_READ], 934 grp->active_channels[CTCM_WRITE]); 935 936 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 937 grp->num_channel_paths++; 938 grp->active_channels[direction]++; 939 grp->outstanding_xid2++; 940 ch->in_mpcgroup = 1; 941 942 if (ch->xid_skb != NULL) 943 dev_kfree_skb_any(ch->xid_skb); 944 945 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 946 GFP_ATOMIC | GFP_DMA); 947 if (ch->xid_skb == NULL) { 948 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 949 "%s(%s): Couldn't alloc ch xid_skb\n", 950 CTCM_FUNTAIL, dev->name); 951 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 952 return; 953 } 954 ch->xid_skb_data = ch->xid_skb->data; 955 ch->xid_th = (struct th_header *)ch->xid_skb->data; 956 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 957 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 958 skb_put(ch->xid_skb, XID2_LENGTH); 959 ch->xid_id = skb_tail_pointer(ch->xid_skb); 960 ch->xid_skb->data = ch->xid_skb_data; 961 skb_reset_tail_pointer(ch->xid_skb); 962 ch->xid_skb->len = 0; 963 964 skb_put_data(ch->xid_skb, grp->xid_skb->data, 965 grp->xid_skb->len); 966 967 ch->xid->xid2_dlc_type = 968 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 969 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 970 971 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 972 ch->xid->xid2_buf_len = 0x00; 973 974 ch->xid_skb->data = ch->xid_skb_data; 975 skb_reset_tail_pointer(ch->xid_skb); 976 ch->xid_skb->len = 0; 977 978 fsm_newstate(ch->fsm, CH_XID0_PENDING); 979 980 if ((grp->active_channels[CTCM_READ] > 0) && 981 (grp->active_channels[CTCM_WRITE] > 0) && 982 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 983 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 984 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 985 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 986 __func__, dev->name); 987 } 988 } else if ((action == MPC_CHANNEL_REMOVE) && 989 (ch->in_mpcgroup == 1)) { 990 ch->in_mpcgroup = 0; 991 grp->num_channel_paths--; 992 grp->active_channels[direction]--; 993 994 if (ch->xid_skb != NULL) 995 dev_kfree_skb_any(ch->xid_skb); 996 ch->xid_skb = NULL; 997 998 if (grp->channels_terminating) 999 goto done; 1000 1001 if (((grp->active_channels[CTCM_READ] == 0) && 1002 (grp->active_channels[CTCM_WRITE] > 0)) 1003 || ((grp->active_channels[CTCM_WRITE] == 0) && 1004 (grp->active_channels[CTCM_READ] > 0))) 1005 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1006 } 1007 done: 1008 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1009 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1010 "read=%i, write=%i\n", __func__, action, 1011 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1012 grp->active_channels[CTCM_READ], 1013 grp->active_channels[CTCM_WRITE]); 1014 1015 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1016 } 1017 1018 /* 1019 * Unpack a just received skb and hand it over to 1020 * upper layers. 1021 * special MPC version of unpack_skb. 1022 * 1023 * ch The channel where this skb has been received. 1024 * pskb The received skb. 1025 */ 1026 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1027 { 1028 struct net_device *dev = ch->netdev; 1029 struct ctcm_priv *priv = dev->ml_priv; 1030 struct mpc_group *grp = priv->mpcg; 1031 struct pdu *curr_pdu; 1032 struct mpcg_info *mpcginfo; 1033 struct th_header *header = NULL; 1034 struct th_sweep *sweep = NULL; 1035 int pdu_last_seen = 0; 1036 __u32 new_len; 1037 struct sk_buff *skb; 1038 int skblen; 1039 int sendrc = 0; 1040 1041 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1042 __func__, dev->name, smp_processor_id(), ch->id); 1043 1044 header = (struct th_header *)pskb->data; 1045 if ((header->th_seg == 0) && 1046 (header->th_ch_flag == 0) && 1047 (header->th_blk_flag == 0) && 1048 (header->th_seq_num == 0)) 1049 /* nothing for us */ goto done; 1050 1051 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1052 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1053 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1054 1055 pskb->dev = dev; 1056 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1057 skb_pull(pskb, TH_HEADER_LENGTH); 1058 1059 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1060 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1061 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1062 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1063 (header->th_seq_num != ch->th_seq_num + 1) && 1064 (ch->th_seq_num != 0))) { 1065 /* This is NOT the next segment * 1066 * we are not the correct race winner * 1067 * go away and let someone else win * 1068 * BUT..this only applies if xid negot * 1069 * is done * 1070 */ 1071 grp->out_of_sequence += 1; 1072 __skb_push(pskb, TH_HEADER_LENGTH); 1073 skb_queue_tail(&ch->io_queue, pskb); 1074 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1075 "got:%08x\n", __func__, 1076 ch->th_seq_num + 1, header->th_seq_num); 1077 1078 return; 1079 } 1080 grp->out_of_sequence = 0; 1081 ch->th_seq_num = header->th_seq_num; 1082 1083 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1084 __func__, ch->th_seq_num); 1085 1086 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1087 goto done; 1088 while ((pskb->len > 0) && !pdu_last_seen) { 1089 curr_pdu = (struct pdu *)pskb->data; 1090 1091 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1092 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1093 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1094 __func__, pskb->len); 1095 1096 skb_pull(pskb, PDU_HEADER_LENGTH); 1097 1098 if (curr_pdu->pdu_flag & PDU_LAST) 1099 pdu_last_seen = 1; 1100 if (curr_pdu->pdu_flag & PDU_CNTL) 1101 pskb->protocol = htons(ETH_P_SNAP); 1102 else 1103 pskb->protocol = htons(ETH_P_SNA_DIX); 1104 1105 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1106 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1107 "%s(%s): Dropping packet with " 1108 "illegal siize %d", 1109 CTCM_FUNTAIL, dev->name, pskb->len); 1110 1111 priv->stats.rx_dropped++; 1112 priv->stats.rx_length_errors++; 1113 goto done; 1114 } 1115 skb_reset_mac_header(pskb); 1116 new_len = curr_pdu->pdu_offset; 1117 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1118 __func__, new_len); 1119 if ((new_len == 0) || (new_len > pskb->len)) { 1120 /* should never happen */ 1121 /* pskb len must be hosed...bail out */ 1122 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1123 "%s(%s): non valid pdu_offset: %04x", 1124 /* "data may be lost", */ 1125 CTCM_FUNTAIL, dev->name, new_len); 1126 goto done; 1127 } 1128 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1129 1130 if (!skb) { 1131 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1132 "%s(%s): MEMORY allocation error", 1133 CTCM_FUNTAIL, dev->name); 1134 priv->stats.rx_dropped++; 1135 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1136 goto done; 1137 } 1138 skb_put_data(skb, pskb->data, new_len); 1139 1140 skb_reset_mac_header(skb); 1141 skb->dev = pskb->dev; 1142 skb->protocol = pskb->protocol; 1143 skb->ip_summed = CHECKSUM_UNNECESSARY; 1144 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1145 ch->pdu_seq++; 1146 1147 if (do_debug_data) { 1148 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1149 __func__, ch->pdu_seq); 1150 ctcm_pr_debug("%s: skb:%0lx " 1151 "skb len: %d \n", __func__, 1152 (unsigned long)skb, skb->len); 1153 ctcm_pr_debug("%s: up to 32 bytes " 1154 "of pdu_data sent\n", __func__); 1155 ctcmpc_dump32((char *)skb->data, skb->len); 1156 } 1157 1158 skblen = skb->len; 1159 sendrc = netif_rx(skb); 1160 priv->stats.rx_packets++; 1161 priv->stats.rx_bytes += skblen; 1162 skb_pull(pskb, new_len); /* point to next PDU */ 1163 } 1164 } else { 1165 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC); 1166 if (mpcginfo == NULL) 1167 goto done; 1168 1169 mpcginfo->ch = ch; 1170 mpcginfo->th = header; 1171 mpcginfo->skb = pskb; 1172 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1173 __func__); 1174 /* it's a sweep? */ 1175 sweep = (struct th_sweep *)pskb->data; 1176 mpcginfo->sweep = sweep; 1177 if (header->th_ch_flag == TH_SWEEP_REQ) 1178 mpc_rcvd_sweep_req(mpcginfo); 1179 else if (header->th_ch_flag == TH_SWEEP_RESP) 1180 mpc_rcvd_sweep_resp(mpcginfo); 1181 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1182 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1183 skb_pull(pskb, XID2_LENGTH); 1184 mpcginfo->xid = thisxid; 1185 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1186 } else if (header->th_blk_flag == TH_DISCONTACT) 1187 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1188 else if (header->th_seq_num != 0) { 1189 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1190 "%s(%s): control pkt expected\n", 1191 CTCM_FUNTAIL, dev->name); 1192 priv->stats.rx_dropped++; 1193 /* mpcginfo only used for non-data transfers */ 1194 if (do_debug_data) 1195 ctcmpc_dump_skb(pskb, -8); 1196 } 1197 kfree(mpcginfo); 1198 } 1199 done: 1200 1201 dev_kfree_skb_any(pskb); 1202 if (sendrc == NET_RX_DROP) { 1203 dev_warn(&dev->dev, 1204 "The network backlog for %s is exceeded, " 1205 "package dropped\n", __func__); 1206 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1207 } 1208 1209 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1210 __func__, dev->name, ch, ch->id); 1211 } 1212 1213 /* 1214 * tasklet helper for mpc's skb unpacking. 1215 * 1216 * ch The channel to work on. 1217 * Allow flow control back pressure to occur here. 1218 * Throttling back channel can result in excessive 1219 * channel inactivity and system deact of channel 1220 */ 1221 void ctcmpc_bh(unsigned long thischan) 1222 { 1223 struct channel *ch = (struct channel *)thischan; 1224 struct sk_buff *skb; 1225 struct net_device *dev = ch->netdev; 1226 struct ctcm_priv *priv = dev->ml_priv; 1227 struct mpc_group *grp = priv->mpcg; 1228 1229 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1230 dev->name, smp_processor_id(), __func__, ch->id); 1231 /* caller has requested driver to throttle back */ 1232 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1233 (skb = skb_dequeue(&ch->io_queue))) { 1234 ctcmpc_unpack_skb(ch, skb); 1235 if (grp->out_of_sequence > 20) { 1236 /* assume data loss has occurred if */ 1237 /* missing seq_num for extended */ 1238 /* period of time */ 1239 grp->out_of_sequence = 0; 1240 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1241 break; 1242 } 1243 if (skb == skb_peek(&ch->io_queue)) 1244 break; 1245 } 1246 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1247 __func__, dev->name, ch, ch->id); 1248 return; 1249 } 1250 1251 /* 1252 * MPC Group Initializations 1253 */ 1254 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1255 { 1256 struct mpc_group *grp; 1257 1258 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1259 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1260 1261 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1262 if (grp == NULL) 1263 return NULL; 1264 1265 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1266 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1267 mpcg_fsm_len, GFP_KERNEL); 1268 if (grp->fsm == NULL) { 1269 kfree(grp); 1270 return NULL; 1271 } 1272 1273 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1274 fsm_settimer(grp->fsm, &grp->timer); 1275 1276 grp->xid_skb = 1277 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1278 if (grp->xid_skb == NULL) { 1279 kfree_fsm(grp->fsm); 1280 kfree(grp); 1281 return NULL; 1282 } 1283 /* base xid for all channels in group */ 1284 grp->xid_skb_data = grp->xid_skb->data; 1285 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1286 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1287 1288 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1289 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1290 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1291 grp->xid->xid2_sender_id = jiffies; 1292 1293 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1294 skb_put_data(grp->xid_skb, "VTAM", 4); 1295 1296 grp->rcvd_xid_skb = 1297 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1298 if (grp->rcvd_xid_skb == NULL) { 1299 kfree_fsm(grp->fsm); 1300 dev_kfree_skb(grp->xid_skb); 1301 kfree(grp); 1302 return NULL; 1303 } 1304 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1305 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1306 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1307 grp->saved_xid2 = NULL; 1308 priv->xid = grp->xid; 1309 priv->mpcg = grp; 1310 return grp; 1311 } 1312 1313 /* 1314 * The MPC Group Station FSM 1315 */ 1316 1317 /* 1318 * MPC Group Station FSM actions 1319 * CTCM_PROTO_MPC only 1320 */ 1321 1322 /* 1323 * NOP action for statemachines 1324 */ 1325 static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1326 { 1327 } 1328 1329 /* 1330 * invoked when the device transitions to dev_stopped 1331 * MPC will stop each individual channel if a single XID failure 1332 * occurs, or will intitiate all channels be stopped if a GROUP 1333 * level failure occurs. 1334 */ 1335 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1336 { 1337 struct net_device *dev = arg; 1338 struct ctcm_priv *priv; 1339 struct mpc_group *grp; 1340 struct channel *wch; 1341 1342 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1343 1344 priv = dev->ml_priv; 1345 grp = priv->mpcg; 1346 grp->flow_off_called = 0; 1347 fsm_deltimer(&grp->timer); 1348 if (grp->channels_terminating) 1349 return; 1350 1351 grp->channels_terminating = 1; 1352 grp->saved_state = fsm_getstate(grp->fsm); 1353 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1354 if (grp->saved_state > MPCG_STATE_XID7INITF) 1355 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1356 "%s(%s): MPC GROUP INOPERATIVE", 1357 CTCM_FUNTAIL, dev->name); 1358 if ((grp->saved_state != MPCG_STATE_RESET) || 1359 /* dealloc_channel has been called */ 1360 (grp->port_persist == 0)) 1361 fsm_deltimer(&priv->restart_timer); 1362 1363 wch = priv->channel[CTCM_WRITE]; 1364 1365 switch (grp->saved_state) { 1366 case MPCG_STATE_RESET: 1367 case MPCG_STATE_INOP: 1368 case MPCG_STATE_XID2INITW: 1369 case MPCG_STATE_XID0IOWAIT: 1370 case MPCG_STATE_XID2INITX: 1371 case MPCG_STATE_XID7INITW: 1372 case MPCG_STATE_XID7INITX: 1373 case MPCG_STATE_XID0IOWAIX: 1374 case MPCG_STATE_XID7INITI: 1375 case MPCG_STATE_XID7INITZ: 1376 case MPCG_STATE_XID7INITF: 1377 break; 1378 case MPCG_STATE_FLOWC: 1379 case MPCG_STATE_READY: 1380 default: 1381 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1382 } 1383 1384 grp->xid2_tgnum = 0; 1385 grp->group_max_buflen = 0; /*min of all received */ 1386 grp->outstanding_xid2 = 0; 1387 grp->outstanding_xid7 = 0; 1388 grp->outstanding_xid7_p2 = 0; 1389 grp->saved_xid2 = NULL; 1390 grp->xidnogood = 0; 1391 grp->changed_side = 0; 1392 1393 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1394 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1395 grp->rcvd_xid_skb->len = 0; 1396 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1397 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1398 1399 if (grp->send_qllc_disc == 1) { 1400 grp->send_qllc_disc = 0; 1401 mpc_send_qllc_discontact(dev); 1402 } 1403 1404 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1405 /* This can result in INOP of VTAM PU due to halting of */ 1406 /* outstanding IO which causes a sense to be returned */ 1407 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1408 /* become unreachable without manual intervention */ 1409 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1410 grp->alloc_called = 0; 1411 fsm_deltimer(&priv->restart_timer); 1412 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1413 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1414 if (grp->saved_state > MPCG_STATE_XID7INITF) 1415 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1416 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1417 CTCM_FUNTAIL, dev->name); 1418 } else { 1419 fsm_deltimer(&priv->restart_timer); 1420 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1421 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1422 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1423 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1424 CTCM_FUNTAIL, dev->name); 1425 } 1426 } 1427 1428 /* 1429 * Handle mpc group action timeout. 1430 * MPC Group Station FSM action 1431 * CTCM_PROTO_MPC only 1432 * 1433 * fi An instance of an mpc_group fsm. 1434 * event The event, just happened. 1435 * arg Generic pointer, casted from net_device * upon call. 1436 */ 1437 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1438 { 1439 struct net_device *dev = arg; 1440 struct ctcm_priv *priv; 1441 struct mpc_group *grp; 1442 struct channel *wch; 1443 struct channel *rch; 1444 1445 priv = dev->ml_priv; 1446 grp = priv->mpcg; 1447 wch = priv->channel[CTCM_WRITE]; 1448 rch = priv->channel[CTCM_READ]; 1449 1450 switch (fsm_getstate(grp->fsm)) { 1451 case MPCG_STATE_XID2INITW: 1452 /* Unless there is outstanding IO on the */ 1453 /* channel just return and wait for ATTN */ 1454 /* interrupt to begin XID negotiations */ 1455 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1456 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1457 break; 1458 fallthrough; 1459 default: 1460 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1461 } 1462 1463 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1464 "%s: dev=%s exit", 1465 CTCM_FUNTAIL, dev->name); 1466 return; 1467 } 1468 1469 /* 1470 * MPC Group Station FSM action 1471 * CTCM_PROTO_MPC only 1472 */ 1473 void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1474 { 1475 struct mpcg_info *mpcginfo = arg; 1476 struct channel *ch = mpcginfo->ch; 1477 struct net_device *dev; 1478 struct ctcm_priv *priv; 1479 struct mpc_group *grp; 1480 1481 if (ch) { 1482 dev = ch->netdev; 1483 if (dev) { 1484 priv = dev->ml_priv; 1485 if (priv) { 1486 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1487 "%s: %s: %s\n", 1488 CTCM_FUNTAIL, dev->name, ch->id); 1489 grp = priv->mpcg; 1490 grp->send_qllc_disc = 1; 1491 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1492 } 1493 } 1494 } 1495 1496 return; 1497 } 1498 1499 /* 1500 * MPC Group Station - not part of FSM 1501 * CTCM_PROTO_MPC only 1502 * called from add_channel in ctcm_main.c 1503 */ 1504 void mpc_action_send_discontact(unsigned long thischan) 1505 { 1506 int rc; 1507 struct channel *ch = (struct channel *)thischan; 1508 unsigned long saveflags = 0; 1509 1510 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1511 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0); 1512 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1513 1514 if (rc != 0) { 1515 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1516 } 1517 1518 return; 1519 } 1520 1521 1522 /* 1523 * helper function of mpc FSM 1524 * CTCM_PROTO_MPC only 1525 * mpc_action_rcvd_xid7 1526 */ 1527 static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1528 { 1529 struct channel *ch = mpcginfo->ch; 1530 struct net_device *dev = ch->netdev; 1531 struct ctcm_priv *priv = dev->ml_priv; 1532 struct mpc_group *grp = priv->mpcg; 1533 struct xid2 *xid = mpcginfo->xid; 1534 int rc = 0; 1535 __u64 our_id = 0; 1536 __u64 their_id = 0; 1537 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1538 1539 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1540 1541 if (xid == NULL) { 1542 rc = 1; 1543 /* XID REJECTED: xid == NULL */ 1544 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1545 "%s(%s): xid = NULL", 1546 CTCM_FUNTAIL, ch->id); 1547 goto done; 1548 } 1549 1550 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1551 1552 /*the received direction should be the opposite of ours */ 1553 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1554 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1555 rc = 2; 1556 /* XID REJECTED: r/w channel pairing mismatch */ 1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1558 "%s(%s): r/w channel pairing mismatch", 1559 CTCM_FUNTAIL, ch->id); 1560 goto done; 1561 } 1562 1563 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1564 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1565 grp->group_max_buflen, xid->xid2_buf_len); 1566 1567 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1568 xid->xid2_buf_len - len) 1569 grp->group_max_buflen = xid->xid2_buf_len - len; 1570 } 1571 1572 if (grp->saved_xid2 == NULL) { 1573 grp->saved_xid2 = 1574 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1575 1576 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1577 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1578 1579 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1580 grp->rcvd_xid_skb->len = 0; 1581 1582 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1583 our_id = (__u64)priv->xid->xid2_adj_id; 1584 our_id = our_id << 32; 1585 our_id = our_id + priv->xid->xid2_sender_id; 1586 their_id = (__u64)xid->xid2_adj_id; 1587 their_id = their_id << 32; 1588 their_id = their_id + xid->xid2_sender_id; 1589 /* lower id assume the xside role */ 1590 if (our_id < their_id) { 1591 grp->roll = XSIDE; 1592 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1593 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1594 CTCM_FUNTAIL, ch->id); 1595 } else { 1596 grp->roll = YSIDE; 1597 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1598 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1599 CTCM_FUNTAIL, ch->id); 1600 } 1601 1602 } else { 1603 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1604 rc = 3; 1605 /* XID REJECTED: xid flag byte4 mismatch */ 1606 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1607 "%s(%s): xid flag byte4 mismatch", 1608 CTCM_FUNTAIL, ch->id); 1609 } 1610 if (xid->xid2_flag2 == 0x40) { 1611 rc = 4; 1612 /* XID REJECTED - xid NOGOOD */ 1613 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1614 "%s(%s): xid NOGOOD", 1615 CTCM_FUNTAIL, ch->id); 1616 } 1617 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1618 rc = 5; 1619 /* XID REJECTED - Adjacent Station ID Mismatch */ 1620 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1621 "%s(%s): Adjacent Station ID Mismatch", 1622 CTCM_FUNTAIL, ch->id); 1623 } 1624 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1625 rc = 6; 1626 /* XID REJECTED - Sender Address Mismatch */ 1627 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1628 "%s(%s): Sender Address Mismatch", 1629 CTCM_FUNTAIL, ch->id); 1630 } 1631 } 1632 done: 1633 if (rc) { 1634 dev_warn(&dev->dev, 1635 "The XID used in the MPC protocol is not valid, " 1636 "rc = %d\n", rc); 1637 priv->xid->xid2_flag2 = 0x40; 1638 grp->saved_xid2->xid2_flag2 = 0x40; 1639 } 1640 1641 return rc; 1642 } 1643 1644 /* 1645 * MPC Group Station FSM action 1646 * CTCM_PROTO_MPC only 1647 */ 1648 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1649 { 1650 struct channel *ch = arg; 1651 int rc = 0; 1652 int gotlock = 0; 1653 unsigned long saveflags = 0; /* avoids compiler warning with 1654 spin_unlock_irqrestore */ 1655 1656 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1657 __func__, smp_processor_id(), ch, ch->id); 1658 1659 if (ctcm_checkalloc_buffer(ch)) 1660 goto done; 1661 1662 /* 1663 * skb data-buffer referencing: 1664 */ 1665 ch->trans_skb->data = ch->trans_skb_data; 1666 skb_reset_tail_pointer(ch->trans_skb); 1667 ch->trans_skb->len = 0; 1668 /* result of the previous 3 statements is NOT always 1669 * already set after ctcm_checkalloc_buffer 1670 * because of possible reuse of the trans_skb 1671 */ 1672 memset(ch->trans_skb->data, 0, 16); 1673 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1674 /* check is main purpose here: */ 1675 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1676 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1677 /* check is main purpose here: */ 1678 skb_put(ch->trans_skb, XID2_LENGTH); 1679 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1680 /* cleanup back to startpoint */ 1681 ch->trans_skb->data = ch->trans_skb_data; 1682 skb_reset_tail_pointer(ch->trans_skb); 1683 ch->trans_skb->len = 0; 1684 1685 /* non-checking rewrite of above skb data-buffer referencing: */ 1686 /* 1687 memset(ch->trans_skb->data, 0, 16); 1688 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1689 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1690 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1691 */ 1692 1693 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1694 ch->ccw[8].count = 0; 1695 ch->ccw[8].cda = 0x00; 1696 1697 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1698 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1699 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1700 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1701 1702 if (side == XSIDE) { 1703 /* mpc_action_xside_xid */ 1704 if (ch->xid_th == NULL) 1705 goto done; 1706 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1707 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1708 ch->ccw[9].count = TH_HEADER_LENGTH; 1709 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1710 1711 if (ch->xid == NULL) 1712 goto done; 1713 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1714 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1715 ch->ccw[10].count = XID2_LENGTH; 1716 ch->ccw[10].cda = virt_to_phys(ch->xid); 1717 1718 ch->ccw[11].cmd_code = CCW_CMD_READ; 1719 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1720 ch->ccw[11].count = TH_HEADER_LENGTH; 1721 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1722 1723 ch->ccw[12].cmd_code = CCW_CMD_READ; 1724 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1725 ch->ccw[12].count = XID2_LENGTH; 1726 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1727 1728 ch->ccw[13].cmd_code = CCW_CMD_READ; 1729 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1730 1731 } else { /* side == YSIDE : mpc_action_yside_xid */ 1732 ch->ccw[9].cmd_code = CCW_CMD_READ; 1733 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1734 ch->ccw[9].count = TH_HEADER_LENGTH; 1735 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1736 1737 ch->ccw[10].cmd_code = CCW_CMD_READ; 1738 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1739 ch->ccw[10].count = XID2_LENGTH; 1740 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1741 1742 if (ch->xid_th == NULL) 1743 goto done; 1744 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1745 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1746 ch->ccw[11].count = TH_HEADER_LENGTH; 1747 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1748 1749 if (ch->xid == NULL) 1750 goto done; 1751 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1752 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1753 ch->ccw[12].count = XID2_LENGTH; 1754 ch->ccw[12].cda = virt_to_phys(ch->xid); 1755 1756 if (ch->xid_id == NULL) 1757 goto done; 1758 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1759 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1760 1761 } 1762 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1763 ch->ccw[13].count = 4; 1764 1765 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1766 ch->ccw[14].flags = CCW_FLAG_SLI; 1767 ch->ccw[14].count = 0; 1768 ch->ccw[14].cda = 0; 1769 1770 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1771 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1772 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1773 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1774 1775 if (!in_hardirq()) { 1776 /* Such conditional locking is a known problem for 1777 * sparse because its static undeterministic. 1778 * Warnings should be ignored here. */ 1779 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1780 gotlock = 1; 1781 } 1782 1783 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1784 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0); 1785 1786 if (gotlock) /* see remark above about conditional locking */ 1787 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1788 1789 if (rc != 0) { 1790 ctcm_ccw_check_rc(ch, rc, 1791 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1792 } 1793 1794 done: 1795 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1796 __func__, ch, ch->id); 1797 return; 1798 1799 } 1800 1801 /* 1802 * MPC Group Station FSM action 1803 * CTCM_PROTO_MPC only 1804 */ 1805 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1806 { 1807 mpc_action_side_xid(fsm, arg, XSIDE); 1808 } 1809 1810 /* 1811 * MPC Group Station FSM action 1812 * CTCM_PROTO_MPC only 1813 */ 1814 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1815 { 1816 mpc_action_side_xid(fsm, arg, YSIDE); 1817 } 1818 1819 /* 1820 * MPC Group Station FSM action 1821 * CTCM_PROTO_MPC only 1822 */ 1823 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1824 { 1825 struct channel *ch = arg; 1826 struct net_device *dev = ch->netdev; 1827 struct ctcm_priv *priv = dev->ml_priv; 1828 struct mpc_group *grp = priv->mpcg; 1829 1830 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1831 __func__, smp_processor_id(), ch, ch->id); 1832 1833 if (ch->xid == NULL) { 1834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1835 "%s(%s): ch->xid == NULL", 1836 CTCM_FUNTAIL, dev->name); 1837 return; 1838 } 1839 1840 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1841 1842 ch->xid->xid2_option = XID2_0; 1843 1844 switch (fsm_getstate(grp->fsm)) { 1845 case MPCG_STATE_XID2INITW: 1846 case MPCG_STATE_XID2INITX: 1847 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1848 break; 1849 case MPCG_STATE_XID0IOWAIT: 1850 case MPCG_STATE_XID0IOWAIX: 1851 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1852 break; 1853 } 1854 1855 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1856 1857 return; 1858 } 1859 1860 /* 1861 * MPC Group Station FSM action 1862 * CTCM_PROTO_MPC only 1863 */ 1864 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1865 { 1866 struct net_device *dev = arg; 1867 struct ctcm_priv *priv = dev->ml_priv; 1868 struct mpc_group *grp = NULL; 1869 int direction; 1870 int send = 0; 1871 1872 if (priv) 1873 grp = priv->mpcg; 1874 if (grp == NULL) 1875 return; 1876 1877 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1878 struct channel *ch = priv->channel[direction]; 1879 struct xid2 *thisxid = ch->xid; 1880 ch->xid_skb->data = ch->xid_skb_data; 1881 skb_reset_tail_pointer(ch->xid_skb); 1882 ch->xid_skb->len = 0; 1883 thisxid->xid2_option = XID2_7; 1884 send = 0; 1885 1886 /* xid7 phase 1 */ 1887 if (grp->outstanding_xid7_p2 > 0) { 1888 if (grp->roll == YSIDE) { 1889 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1890 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1891 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1892 skb_put_data(ch->xid_skb, &thdummy, 1893 TH_HEADER_LENGTH); 1894 send = 1; 1895 } 1896 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1897 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1898 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1899 skb_put_data(ch->xid_skb, &thnorm, 1900 TH_HEADER_LENGTH); 1901 send = 1; 1902 } 1903 } else { 1904 /* xid7 phase 2 */ 1905 if (grp->roll == YSIDE) { 1906 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1907 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1908 skb_put_data(ch->xid_skb, &thnorm, 1909 TH_HEADER_LENGTH); 1910 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1911 send = 1; 1912 } 1913 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1914 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1915 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1916 skb_put_data(ch->xid_skb, &thdummy, 1917 TH_HEADER_LENGTH); 1918 send = 1; 1919 } 1920 } 1921 1922 if (send) 1923 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1924 } 1925 1926 return; 1927 } 1928 1929 /* 1930 * MPC Group Station FSM action 1931 * CTCM_PROTO_MPC only 1932 */ 1933 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1934 { 1935 1936 struct mpcg_info *mpcginfo = arg; 1937 struct channel *ch = mpcginfo->ch; 1938 struct net_device *dev = ch->netdev; 1939 struct ctcm_priv *priv = dev->ml_priv; 1940 struct mpc_group *grp = priv->mpcg; 1941 1942 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1943 __func__, ch->id, grp->outstanding_xid2, 1944 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1945 1946 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1947 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1948 1949 grp->outstanding_xid2--; 1950 grp->outstanding_xid7++; 1951 grp->outstanding_xid7_p2++; 1952 1953 /* must change state before validating xid to */ 1954 /* properly handle interim interrupts received*/ 1955 switch (fsm_getstate(grp->fsm)) { 1956 case MPCG_STATE_XID2INITW: 1957 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1958 mpc_validate_xid(mpcginfo); 1959 break; 1960 case MPCG_STATE_XID0IOWAIT: 1961 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1962 mpc_validate_xid(mpcginfo); 1963 break; 1964 case MPCG_STATE_XID2INITX: 1965 if (grp->outstanding_xid2 == 0) { 1966 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1967 mpc_validate_xid(mpcginfo); 1968 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1969 } 1970 break; 1971 case MPCG_STATE_XID0IOWAIX: 1972 if (grp->outstanding_xid2 == 0) { 1973 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1974 mpc_validate_xid(mpcginfo); 1975 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1976 } 1977 break; 1978 } 1979 1980 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1981 __func__, ch->id, grp->outstanding_xid2, 1982 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1983 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 1984 __func__, ch->id, 1985 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 1986 return; 1987 1988 } 1989 1990 1991 /* 1992 * MPC Group Station FSM action 1993 * CTCM_PROTO_MPC only 1994 */ 1995 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 1996 { 1997 struct mpcg_info *mpcginfo = arg; 1998 struct channel *ch = mpcginfo->ch; 1999 struct net_device *dev = ch->netdev; 2000 struct ctcm_priv *priv = dev->ml_priv; 2001 struct mpc_group *grp = priv->mpcg; 2002 2003 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2004 __func__, smp_processor_id(), ch, ch->id); 2005 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2006 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2007 2008 grp->outstanding_xid7--; 2009 ch->xid_skb->data = ch->xid_skb_data; 2010 skb_reset_tail_pointer(ch->xid_skb); 2011 ch->xid_skb->len = 0; 2012 2013 switch (fsm_getstate(grp->fsm)) { 2014 case MPCG_STATE_XID7INITI: 2015 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2016 mpc_validate_xid(mpcginfo); 2017 break; 2018 case MPCG_STATE_XID7INITW: 2019 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2020 mpc_validate_xid(mpcginfo); 2021 break; 2022 case MPCG_STATE_XID7INITZ: 2023 case MPCG_STATE_XID7INITX: 2024 if (grp->outstanding_xid7 == 0) { 2025 if (grp->outstanding_xid7_p2 > 0) { 2026 grp->outstanding_xid7 = 2027 grp->outstanding_xid7_p2; 2028 grp->outstanding_xid7_p2 = 0; 2029 } else 2030 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2031 2032 mpc_validate_xid(mpcginfo); 2033 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2034 break; 2035 } 2036 mpc_validate_xid(mpcginfo); 2037 break; 2038 } 2039 return; 2040 } 2041 2042 /* 2043 * mpc_action helper of an MPC Group Station FSM action 2044 * CTCM_PROTO_MPC only 2045 */ 2046 static int mpc_send_qllc_discontact(struct net_device *dev) 2047 { 2048 struct sk_buff *skb; 2049 struct qllc *qllcptr; 2050 struct ctcm_priv *priv = dev->ml_priv; 2051 struct mpc_group *grp = priv->mpcg; 2052 2053 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2054 __func__, mpcg_state_names[grp->saved_state]); 2055 2056 switch (grp->saved_state) { 2057 /* 2058 * establish conn callback function is 2059 * preferred method to report failure 2060 */ 2061 case MPCG_STATE_XID0IOWAIT: 2062 case MPCG_STATE_XID0IOWAIX: 2063 case MPCG_STATE_XID7INITI: 2064 case MPCG_STATE_XID7INITZ: 2065 case MPCG_STATE_XID2INITW: 2066 case MPCG_STATE_XID2INITX: 2067 case MPCG_STATE_XID7INITW: 2068 case MPCG_STATE_XID7INITX: 2069 if (grp->estconnfunc) { 2070 grp->estconnfunc(grp->port_num, -1, 0); 2071 grp->estconnfunc = NULL; 2072 break; 2073 } 2074 fallthrough; 2075 case MPCG_STATE_FLOWC: 2076 case MPCG_STATE_READY: 2077 grp->send_qllc_disc = 2; 2078 2079 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC); 2080 if (skb == NULL) { 2081 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2082 "%s(%s): skb allocation error", 2083 CTCM_FUNTAIL, dev->name); 2084 priv->stats.rx_dropped++; 2085 return -ENOMEM; 2086 } 2087 2088 qllcptr = skb_put(skb, sizeof(struct qllc)); 2089 qllcptr->qllc_address = 0xcc; 2090 qllcptr->qllc_commands = 0x03; 2091 2092 if (skb_headroom(skb) < 4) { 2093 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2094 "%s(%s): skb_headroom error", 2095 CTCM_FUNTAIL, dev->name); 2096 dev_kfree_skb_any(skb); 2097 return -ENOMEM; 2098 } 2099 2100 *((__u32 *)skb_push(skb, 4)) = 2101 priv->channel[CTCM_READ]->pdu_seq; 2102 priv->channel[CTCM_READ]->pdu_seq++; 2103 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2104 __func__, priv->channel[CTCM_READ]->pdu_seq); 2105 2106 /* receipt of CC03 resets anticipated sequence number on 2107 receiving side */ 2108 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2109 skb_reset_mac_header(skb); 2110 skb->dev = dev; 2111 skb->protocol = htons(ETH_P_SNAP); 2112 skb->ip_summed = CHECKSUM_UNNECESSARY; 2113 2114 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2115 2116 netif_rx(skb); 2117 break; 2118 default: 2119 break; 2120 2121 } 2122 2123 return 0; 2124 } 2125 /* --- This is the END my friend --- */ 2126 2127