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