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 59static 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 82static 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 90static 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 107static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb); 108 109/* 110 * MPC Group state machine actions (static prototypes) 111 */ 112static void mpc_action_nop(fsm_instance *fsm, int event, void *arg); 113static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg); 114static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg); 115static void mpc_action_timeout(fsm_instance *fi, int event, void *arg); 116static int mpc_validate_xid(struct mpcg_info *mpcginfo); 117static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg); 118static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg); 119static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg); 120static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg); 121static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg); 122static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg); 123 124#ifdef DEBUGDATA 125/*-------------------------------------------------------------------* 126* Dump buffer format * 127* * 128*--------------------------------------------------------------------*/ 129void 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 */ 228void 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 269dumpth: 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 } 278dumpdata: 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 288static 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 */ 327int 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} 391EXPORT_SYMBOL(ctc_mpc_alloc_channel); 392 393/* 394 * ctc_mpc_establish_connectivity 395 * (exported interface) 396 */ 397void 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 507done: 508 CTCM_PR_DEBUG("Exit %s()\n", __func__); 509 return; 510} 511EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 512 513/* 514 * ctc_mpc_dealloc_ch 515 * (exported interface) 516 */ 517void 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} 545EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 546 547/* 548 * ctc_mpc_flow_control 549 * (exported interface) 550 */ 551void 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} 600EXPORT_SYMBOL(ctc_mpc_flow_control); 601 602static int mpc_send_qllc_discontact(struct net_device *); 603 604/* 605 * helper function of ctcmpc_unpack_skb 606*/ 607static 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 */ 637static 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 = kmalloc(sizeof(struct th_sweep), gfp_type()); 657 658 if (!header) { 659 dev_kfree_skb_any(sweep_skb); 660 goto done; 661 } 662 663 header->th.th_seg = 0x00 ; 664 header->th.th_ch_flag = TH_SWEEP_RESP; 665 header->th.th_blk_flag = 0x00; 666 header->th.th_is_xid = 0x00; 667 header->th.th_seq_num = 0x00; 668 header->sw.th_last_seq = ch->th_seq_num; 669 670 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH); 671 672 kfree(header); 673 674 netif_trans_update(dev); 675 skb_queue_tail(&ch->sweep_queue, sweep_skb); 676 677 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 678 679 return; 680 681done: 682 grp->in_sweep = 0; 683 ctcm_clear_busy_do(dev); 684 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 685 686 return; 687} 688 689/* 690 * helper function of ctcmpc_unpack_skb 691 */ 692static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 693{ 694 struct channel *rch = mpcginfo->ch; 695 struct net_device *dev = rch->netdev; 696 struct ctcm_priv *priv = dev->ml_priv; 697 struct mpc_group *grp = priv->mpcg; 698 struct channel *ch = priv->channel[CTCM_WRITE]; 699 700 if (do_debug) 701 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 702 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 703 704 if (grp->in_sweep == 0) { 705 grp->in_sweep = 1; 706 ctcm_test_and_set_busy(dev); 707 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 708 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 709 } 710 711 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 712 713 grp->sweep_req_pend_num--; 714 ctcmpc_send_sweep_resp(ch); 715 kfree(mpcginfo); 716 return; 717} 718 719/* 720 * MPC Group Station FSM definitions 721 */ 722static const char *mpcg_event_names[] = { 723 [MPCG_EVENT_INOP] = "INOP Condition", 724 [MPCG_EVENT_DISCONC] = "Discontact Received", 725 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 726 [MPCG_EVENT_XID2] = "XID2 Received", 727 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 728 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 729 [MPCG_EVENT_TIMER] = "XID Setup Timer", 730 [MPCG_EVENT_DOIO] = "XID DoIO", 731}; 732 733static const char *mpcg_state_names[] = { 734 [MPCG_STATE_RESET] = "Reset", 735 [MPCG_STATE_INOP] = "INOP", 736 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 737 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 738 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 739 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 740 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 741 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 742 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 743 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 744 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 745 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 746 [MPCG_STATE_READY] = "READY", 747}; 748 749/* 750 * The MPC Group Station FSM 751 * 22 events 752 */ 753static const fsm_node mpcg_fsm[] = { 754 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 755 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 756 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 757 758 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 759 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 760 761 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 762 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 763 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 764 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 765 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 766 767 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 768 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 769 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 770 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 771 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 772 773 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 774 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 775 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 776 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 777 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 778 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 779 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 780 781 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 782 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 783 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 784 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 785 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 786 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 787 788 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 789 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 790 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 791 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 792 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 793 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 794 795 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 796 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 797 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 798 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 799 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 800 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 801 802 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 803 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 804 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 805 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 806 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 807 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 808 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 809 810 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 811 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 812 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 813 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 814 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 815 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 816 817 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 818 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 819}; 820 821static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 822 823/* 824 * MPC Group Station FSM action 825 * CTCM_PROTO_MPC only 826 */ 827static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 828{ 829 struct net_device *dev = arg; 830 struct ctcm_priv *priv = dev->ml_priv; 831 struct mpc_group *grp = priv->mpcg; 832 833 if (grp == NULL) { 834 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 835 "%s(%s): No MPC group", 836 CTCM_FUNTAIL, dev->name); 837 return; 838 } 839 840 fsm_deltimer(&grp->timer); 841 842 if (grp->saved_xid2->xid2_flag2 == 0x40) { 843 priv->xid->xid2_flag2 = 0x00; 844 if (grp->estconnfunc) { 845 grp->estconnfunc(grp->port_num, 1, 846 grp->group_max_buflen); 847 grp->estconnfunc = NULL; 848 } else if (grp->allochanfunc) 849 grp->send_qllc_disc = 1; 850 851 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 852 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 853 "%s(%s): fails", 854 CTCM_FUNTAIL, dev->name); 855 return; 856 } 857 858 grp->port_persist = 1; 859 grp->out_of_sequence = 0; 860 grp->estconn_called = 0; 861 862 tasklet_hi_schedule(&grp->mpc_tasklet2); 863 864 return; 865} 866 867/* 868 * helper of ctcm_init_netdevice 869 * CTCM_PROTO_MPC only 870 */ 871void mpc_group_ready(unsigned long adev) 872{ 873 struct net_device *dev = (struct net_device *)adev; 874 struct ctcm_priv *priv = dev->ml_priv; 875 struct mpc_group *grp = priv->mpcg; 876 struct channel *ch = NULL; 877 878 if (grp == NULL) { 879 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 880 "%s(%s): No MPC group", 881 CTCM_FUNTAIL, dev->name); 882 return; 883 } 884 885 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 886 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 887 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 888 889 fsm_newstate(grp->fsm, MPCG_STATE_READY); 890 891 /* Put up a read on the channel */ 892 ch = priv->channel[CTCM_READ]; 893 ch->pdu_seq = 0; 894 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 895 __func__, ch->pdu_seq); 896 897 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 898 /* Put the write channel in idle state */ 899 ch = priv->channel[CTCM_WRITE]; 900 if (ch->collect_len > 0) { 901 spin_lock(&ch->collect_lock); 902 ctcm_purge_skb_queue(&ch->collect_queue); 903 ch->collect_len = 0; 904 spin_unlock(&ch->collect_lock); 905 } 906 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 907 ctcm_clear_busy(dev); 908 909 if (grp->estconnfunc) { 910 grp->estconnfunc(grp->port_num, 0, 911 grp->group_max_buflen); 912 grp->estconnfunc = NULL; 913 } else if (grp->allochanfunc) 914 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 915 916 grp->send_qllc_disc = 1; 917 grp->changed_side = 0; 918 919 return; 920 921} 922 923/* 924 * Increment the MPC Group Active Channel Counts 925 * helper of dev_action (called from channel fsm) 926 */ 927void mpc_channel_action(struct channel *ch, int direction, int action) 928{ 929 struct net_device *dev = ch->netdev; 930 struct ctcm_priv *priv = dev->ml_priv; 931 struct mpc_group *grp = priv->mpcg; 932 933 if (grp == NULL) { 934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 935 "%s(%s): No MPC group", 936 CTCM_FUNTAIL, dev->name); 937 return; 938 } 939 940 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 941 942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 943 "%s: %i / Grp:%s total_channels=%i, active_channels: " 944 "read=%i, write=%i\n", __func__, action, 945 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 946 grp->active_channels[CTCM_READ], 947 grp->active_channels[CTCM_WRITE]); 948 949 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 950 grp->num_channel_paths++; 951 grp->active_channels[direction]++; 952 grp->outstanding_xid2++; 953 ch->in_mpcgroup = 1; 954 955 if (ch->xid_skb != NULL) 956 dev_kfree_skb_any(ch->xid_skb); 957 958 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 959 GFP_ATOMIC | GFP_DMA); 960 if (ch->xid_skb == NULL) { 961 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 962 "%s(%s): Couldn't alloc ch xid_skb\n", 963 CTCM_FUNTAIL, dev->name); 964 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 965 return; 966 } 967 ch->xid_skb_data = ch->xid_skb->data; 968 ch->xid_th = (struct th_header *)ch->xid_skb->data; 969 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 970 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 971 skb_put(ch->xid_skb, XID2_LENGTH); 972 ch->xid_id = skb_tail_pointer(ch->xid_skb); 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 skb_put_data(ch->xid_skb, grp->xid_skb->data, 978 grp->xid_skb->len); 979 980 ch->xid->xid2_dlc_type = 981 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 982 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 983 984 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 985 ch->xid->xid2_buf_len = 0x00; 986 987 ch->xid_skb->data = ch->xid_skb_data; 988 skb_reset_tail_pointer(ch->xid_skb); 989 ch->xid_skb->len = 0; 990 991 fsm_newstate(ch->fsm, CH_XID0_PENDING); 992 993 if ((grp->active_channels[CTCM_READ] > 0) && 994 (grp->active_channels[CTCM_WRITE] > 0) && 995 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 996 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 997 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 998 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 999 __func__, dev->name); 1000 } 1001 } else if ((action == MPC_CHANNEL_REMOVE) && 1002 (ch->in_mpcgroup == 1)) { 1003 ch->in_mpcgroup = 0; 1004 grp->num_channel_paths--; 1005 grp->active_channels[direction]--; 1006 1007 if (ch->xid_skb != NULL) 1008 dev_kfree_skb_any(ch->xid_skb); 1009 ch->xid_skb = NULL; 1010 1011 if (grp->channels_terminating) 1012 goto done; 1013 1014 if (((grp->active_channels[CTCM_READ] == 0) && 1015 (grp->active_channels[CTCM_WRITE] > 0)) 1016 || ((grp->active_channels[CTCM_WRITE] == 0) && 1017 (grp->active_channels[CTCM_READ] > 0))) 1018 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1019 } 1020done: 1021 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1022 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1023 "read=%i, write=%i\n", __func__, action, 1024 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1025 grp->active_channels[CTCM_READ], 1026 grp->active_channels[CTCM_WRITE]); 1027 1028 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1029} 1030 1031/** 1032 * Unpack a just received skb and hand it over to 1033 * upper layers. 1034 * special MPC version of unpack_skb. 1035 * 1036 * ch The channel where this skb has been received. 1037 * pskb The received skb. 1038 */ 1039static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1040{ 1041 struct net_device *dev = ch->netdev; 1042 struct ctcm_priv *priv = dev->ml_priv; 1043 struct mpc_group *grp = priv->mpcg; 1044 struct pdu *curr_pdu; 1045 struct mpcg_info *mpcginfo; 1046 struct th_header *header = NULL; 1047 struct th_sweep *sweep = NULL; 1048 int pdu_last_seen = 0; 1049 __u32 new_len; 1050 struct sk_buff *skb; 1051 int skblen; 1052 int sendrc = 0; 1053 1054 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1055 __func__, dev->name, smp_processor_id(), ch->id); 1056 1057 header = (struct th_header *)pskb->data; 1058 if ((header->th_seg == 0) && 1059 (header->th_ch_flag == 0) && 1060 (header->th_blk_flag == 0) && 1061 (header->th_seq_num == 0)) 1062 /* nothing for us */ goto done; 1063 1064 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1065 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1066 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1067 1068 pskb->dev = dev; 1069 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1070 skb_pull(pskb, TH_HEADER_LENGTH); 1071 1072 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1073 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1074 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1075 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1076 (header->th_seq_num != ch->th_seq_num + 1) && 1077 (ch->th_seq_num != 0))) { 1078 /* This is NOT the next segment * 1079 * we are not the correct race winner * 1080 * go away and let someone else win * 1081 * BUT..this only applies if xid negot * 1082 * is done * 1083 */ 1084 grp->out_of_sequence += 1; 1085 __skb_push(pskb, TH_HEADER_LENGTH); 1086 skb_queue_tail(&ch->io_queue, pskb); 1087 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1088 "got:%08x\n", __func__, 1089 ch->th_seq_num + 1, header->th_seq_num); 1090 1091 return; 1092 } 1093 grp->out_of_sequence = 0; 1094 ch->th_seq_num = header->th_seq_num; 1095 1096 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1097 __func__, ch->th_seq_num); 1098 1099 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1100 goto done; 1101 while ((pskb->len > 0) && !pdu_last_seen) { 1102 curr_pdu = (struct pdu *)pskb->data; 1103 1104 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1105 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1106 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1107 __func__, pskb->len); 1108 1109 skb_pull(pskb, PDU_HEADER_LENGTH); 1110 1111 if (curr_pdu->pdu_flag & PDU_LAST) 1112 pdu_last_seen = 1; 1113 if (curr_pdu->pdu_flag & PDU_CNTL) 1114 pskb->protocol = htons(ETH_P_SNAP); 1115 else 1116 pskb->protocol = htons(ETH_P_SNA_DIX); 1117 1118 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1120 "%s(%s): Dropping packet with " 1121 "illegal siize %d", 1122 CTCM_FUNTAIL, dev->name, pskb->len); 1123 1124 priv->stats.rx_dropped++; 1125 priv->stats.rx_length_errors++; 1126 goto done; 1127 } 1128 skb_reset_mac_header(pskb); 1129 new_len = curr_pdu->pdu_offset; 1130 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1131 __func__, new_len); 1132 if ((new_len == 0) || (new_len > pskb->len)) { 1133 /* should never happen */ 1134 /* pskb len must be hosed...bail out */ 1135 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1136 "%s(%s): non valid pdu_offset: %04x", 1137 /* "data may be lost", */ 1138 CTCM_FUNTAIL, dev->name, new_len); 1139 goto done; 1140 } 1141 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1142 1143 if (!skb) { 1144 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1145 "%s(%s): MEMORY allocation error", 1146 CTCM_FUNTAIL, dev->name); 1147 priv->stats.rx_dropped++; 1148 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1149 goto done; 1150 } 1151 skb_put_data(skb, pskb->data, new_len); 1152 1153 skb_reset_mac_header(skb); 1154 skb->dev = pskb->dev; 1155 skb->protocol = pskb->protocol; 1156 skb->ip_summed = CHECKSUM_UNNECESSARY; 1157 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1158 ch->pdu_seq++; 1159 1160 if (do_debug_data) { 1161 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1162 __func__, ch->pdu_seq); 1163 ctcm_pr_debug("%s: skb:%0lx " 1164 "skb len: %d \n", __func__, 1165 (unsigned long)skb, skb->len); 1166 ctcm_pr_debug("%s: up to 32 bytes " 1167 "of pdu_data sent\n", __func__); 1168 ctcmpc_dump32((char *)skb->data, skb->len); 1169 } 1170 1171 skblen = skb->len; 1172 sendrc = netif_rx(skb); 1173 priv->stats.rx_packets++; 1174 priv->stats.rx_bytes += skblen; 1175 skb_pull(pskb, new_len); /* point to next PDU */ 1176 } 1177 } else { 1178 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type()); 1179 if (mpcginfo == NULL) 1180 goto done; 1181 1182 mpcginfo->ch = ch; 1183 mpcginfo->th = header; 1184 mpcginfo->skb = pskb; 1185 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1186 __func__); 1187 /* it's a sweep? */ 1188 sweep = (struct th_sweep *)pskb->data; 1189 mpcginfo->sweep = sweep; 1190 if (header->th_ch_flag == TH_SWEEP_REQ) 1191 mpc_rcvd_sweep_req(mpcginfo); 1192 else if (header->th_ch_flag == TH_SWEEP_RESP) 1193 mpc_rcvd_sweep_resp(mpcginfo); 1194 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1195 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1196 skb_pull(pskb, XID2_LENGTH); 1197 mpcginfo->xid = thisxid; 1198 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1199 } else if (header->th_blk_flag == TH_DISCONTACT) 1200 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1201 else if (header->th_seq_num != 0) { 1202 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1203 "%s(%s): control pkt expected\n", 1204 CTCM_FUNTAIL, dev->name); 1205 priv->stats.rx_dropped++; 1206 /* mpcginfo only used for non-data transfers */ 1207 if (do_debug_data) 1208 ctcmpc_dump_skb(pskb, -8); 1209 } 1210 kfree(mpcginfo); 1211 } 1212done: 1213 1214 dev_kfree_skb_any(pskb); 1215 if (sendrc == NET_RX_DROP) { 1216 dev_warn(&dev->dev, 1217 "The network backlog for %s is exceeded, " 1218 "package dropped\n", __func__); 1219 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1220 } 1221 1222 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1223 __func__, dev->name, ch, ch->id); 1224} 1225 1226/** 1227 * tasklet helper for mpc's skb unpacking. 1228 * 1229 * ch The channel to work on. 1230 * Allow flow control back pressure to occur here. 1231 * Throttling back channel can result in excessive 1232 * channel inactivity and system deact of channel 1233 */ 1234void ctcmpc_bh(unsigned long thischan) 1235{ 1236 struct channel *ch = (struct channel *)thischan; 1237 struct sk_buff *skb; 1238 struct net_device *dev = ch->netdev; 1239 struct ctcm_priv *priv = dev->ml_priv; 1240 struct mpc_group *grp = priv->mpcg; 1241 1242 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1243 dev->name, smp_processor_id(), __func__, ch->id); 1244 /* caller has requested driver to throttle back */ 1245 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1246 (skb = skb_dequeue(&ch->io_queue))) { 1247 ctcmpc_unpack_skb(ch, skb); 1248 if (grp->out_of_sequence > 20) { 1249 /* assume data loss has occurred if */ 1250 /* missing seq_num for extended */ 1251 /* period of time */ 1252 grp->out_of_sequence = 0; 1253 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1254 break; 1255 } 1256 if (skb == skb_peek(&ch->io_queue)) 1257 break; 1258 } 1259 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1260 __func__, dev->name, ch, ch->id); 1261 return; 1262} 1263 1264/* 1265 * MPC Group Initializations 1266 */ 1267struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1268{ 1269 struct mpc_group *grp; 1270 1271 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1272 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1273 1274 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1275 if (grp == NULL) 1276 return NULL; 1277 1278 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1279 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1280 mpcg_fsm_len, GFP_KERNEL); 1281 if (grp->fsm == NULL) { 1282 kfree(grp); 1283 return NULL; 1284 } 1285 1286 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1287 fsm_settimer(grp->fsm, &grp->timer); 1288 1289 grp->xid_skb = 1290 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1291 if (grp->xid_skb == NULL) { 1292 kfree_fsm(grp->fsm); 1293 kfree(grp); 1294 return NULL; 1295 } 1296 /* base xid for all channels in group */ 1297 grp->xid_skb_data = grp->xid_skb->data; 1298 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1299 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1300 1301 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1302 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1303 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1304 grp->xid->xid2_sender_id = jiffies; 1305 1306 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1307 skb_put_data(grp->xid_skb, "VTAM", 4); 1308 1309 grp->rcvd_xid_skb = 1310 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1311 if (grp->rcvd_xid_skb == NULL) { 1312 kfree_fsm(grp->fsm); 1313 dev_kfree_skb(grp->xid_skb); 1314 kfree(grp); 1315 return NULL; 1316 } 1317 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1318 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1319 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1320 grp->saved_xid2 = NULL; 1321 priv->xid = grp->xid; 1322 priv->mpcg = grp; 1323 return grp; 1324} 1325 1326/* 1327 * The MPC Group Station FSM 1328 */ 1329 1330/* 1331 * MPC Group Station FSM actions 1332 * CTCM_PROTO_MPC only 1333 */ 1334 1335/** 1336 * NOP action for statemachines 1337 */ 1338static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1339{ 1340} 1341 1342/* 1343 * invoked when the device transitions to dev_stopped 1344 * MPC will stop each individual channel if a single XID failure 1345 * occurs, or will intitiate all channels be stopped if a GROUP 1346 * level failure occurs. 1347 */ 1348static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1349{ 1350 struct net_device *dev = arg; 1351 struct ctcm_priv *priv; 1352 struct mpc_group *grp; 1353 struct channel *wch; 1354 1355 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1356 1357 priv = dev->ml_priv; 1358 grp = priv->mpcg; 1359 grp->flow_off_called = 0; 1360 fsm_deltimer(&grp->timer); 1361 if (grp->channels_terminating) 1362 return; 1363 1364 grp->channels_terminating = 1; 1365 grp->saved_state = fsm_getstate(grp->fsm); 1366 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1367 if (grp->saved_state > MPCG_STATE_XID7INITF) 1368 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1369 "%s(%s): MPC GROUP INOPERATIVE", 1370 CTCM_FUNTAIL, dev->name); 1371 if ((grp->saved_state != MPCG_STATE_RESET) || 1372 /* dealloc_channel has been called */ 1373 (grp->port_persist == 0)) 1374 fsm_deltimer(&priv->restart_timer); 1375 1376 wch = priv->channel[CTCM_WRITE]; 1377 1378 switch (grp->saved_state) { 1379 case MPCG_STATE_RESET: 1380 case MPCG_STATE_INOP: 1381 case MPCG_STATE_XID2INITW: 1382 case MPCG_STATE_XID0IOWAIT: 1383 case MPCG_STATE_XID2INITX: 1384 case MPCG_STATE_XID7INITW: 1385 case MPCG_STATE_XID7INITX: 1386 case MPCG_STATE_XID0IOWAIX: 1387 case MPCG_STATE_XID7INITI: 1388 case MPCG_STATE_XID7INITZ: 1389 case MPCG_STATE_XID7INITF: 1390 break; 1391 case MPCG_STATE_FLOWC: 1392 case MPCG_STATE_READY: 1393 default: 1394 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1395 } 1396 1397 grp->xid2_tgnum = 0; 1398 grp->group_max_buflen = 0; /*min of all received */ 1399 grp->outstanding_xid2 = 0; 1400 grp->outstanding_xid7 = 0; 1401 grp->outstanding_xid7_p2 = 0; 1402 grp->saved_xid2 = NULL; 1403 grp->xidnogood = 0; 1404 grp->changed_side = 0; 1405 1406 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1407 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1408 grp->rcvd_xid_skb->len = 0; 1409 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1410 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1411 1412 if (grp->send_qllc_disc == 1) { 1413 grp->send_qllc_disc = 0; 1414 mpc_send_qllc_discontact(dev); 1415 } 1416 1417 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1418 /* This can result in INOP of VTAM PU due to halting of */ 1419 /* outstanding IO which causes a sense to be returned */ 1420 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1421 /* become unreachable without manual intervention */ 1422 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1423 grp->alloc_called = 0; 1424 fsm_deltimer(&priv->restart_timer); 1425 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1426 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1427 if (grp->saved_state > MPCG_STATE_XID7INITF) 1428 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1429 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1430 CTCM_FUNTAIL, dev->name); 1431 } else { 1432 fsm_deltimer(&priv->restart_timer); 1433 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1434 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1435 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1436 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1437 CTCM_FUNTAIL, dev->name); 1438 } 1439} 1440 1441/** 1442 * Handle mpc group action timeout. 1443 * MPC Group Station FSM action 1444 * CTCM_PROTO_MPC only 1445 * 1446 * fi An instance of an mpc_group fsm. 1447 * event The event, just happened. 1448 * arg Generic pointer, casted from net_device * upon call. 1449 */ 1450static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1451{ 1452 struct net_device *dev = arg; 1453 struct ctcm_priv *priv; 1454 struct mpc_group *grp; 1455 struct channel *wch; 1456 struct channel *rch; 1457 1458 priv = dev->ml_priv; 1459 grp = priv->mpcg; 1460 wch = priv->channel[CTCM_WRITE]; 1461 rch = priv->channel[CTCM_READ]; 1462 1463 switch (fsm_getstate(grp->fsm)) { 1464 case MPCG_STATE_XID2INITW: 1465 /* Unless there is outstanding IO on the */ 1466 /* channel just return and wait for ATTN */ 1467 /* interrupt to begin XID negotiations */ 1468 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1469 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1470 break; 1471 fallthrough; 1472 default: 1473 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1474 } 1475 1476 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1477 "%s: dev=%s exit", 1478 CTCM_FUNTAIL, dev->name); 1479 return; 1480} 1481 1482/* 1483 * MPC Group Station FSM action 1484 * CTCM_PROTO_MPC only 1485 */ 1486void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1487{ 1488 struct mpcg_info *mpcginfo = arg; 1489 struct channel *ch = mpcginfo->ch; 1490 struct net_device *dev; 1491 struct ctcm_priv *priv; 1492 struct mpc_group *grp; 1493 1494 if (ch) { 1495 dev = ch->netdev; 1496 if (dev) { 1497 priv = dev->ml_priv; 1498 if (priv) { 1499 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1500 "%s: %s: %s\n", 1501 CTCM_FUNTAIL, dev->name, ch->id); 1502 grp = priv->mpcg; 1503 grp->send_qllc_disc = 1; 1504 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1505 } 1506 } 1507 } 1508 1509 return; 1510} 1511 1512/* 1513 * MPC Group Station - not part of FSM 1514 * CTCM_PROTO_MPC only 1515 * called from add_channel in ctcm_main.c 1516 */ 1517void mpc_action_send_discontact(unsigned long thischan) 1518{ 1519 int rc; 1520 struct channel *ch = (struct channel *)thischan; 1521 unsigned long saveflags = 0; 1522 1523 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1524 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0); 1525 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1526 1527 if (rc != 0) { 1528 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1529 } 1530 1531 return; 1532} 1533 1534 1535/* 1536 * helper function of mpc FSM 1537 * CTCM_PROTO_MPC only 1538 * mpc_action_rcvd_xid7 1539*/ 1540static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1541{ 1542 struct channel *ch = mpcginfo->ch; 1543 struct net_device *dev = ch->netdev; 1544 struct ctcm_priv *priv = dev->ml_priv; 1545 struct mpc_group *grp = priv->mpcg; 1546 struct xid2 *xid = mpcginfo->xid; 1547 int rc = 0; 1548 __u64 our_id = 0; 1549 __u64 their_id = 0; 1550 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1551 1552 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1553 1554 if (xid == NULL) { 1555 rc = 1; 1556 /* XID REJECTED: xid == NULL */ 1557 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1558 "%s(%s): xid = NULL", 1559 CTCM_FUNTAIL, ch->id); 1560 goto done; 1561 } 1562 1563 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1564 1565 /*the received direction should be the opposite of ours */ 1566 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1567 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1568 rc = 2; 1569 /* XID REJECTED: r/w channel pairing mismatch */ 1570 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1571 "%s(%s): r/w channel pairing mismatch", 1572 CTCM_FUNTAIL, ch->id); 1573 goto done; 1574 } 1575 1576 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1577 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1578 grp->group_max_buflen, xid->xid2_buf_len); 1579 1580 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1581 xid->xid2_buf_len - len) 1582 grp->group_max_buflen = xid->xid2_buf_len - len; 1583 } 1584 1585 if (grp->saved_xid2 == NULL) { 1586 grp->saved_xid2 = 1587 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1588 1589 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1590 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1591 1592 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1593 grp->rcvd_xid_skb->len = 0; 1594 1595 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1596 our_id = (__u64)priv->xid->xid2_adj_id; 1597 our_id = our_id << 32; 1598 our_id = our_id + priv->xid->xid2_sender_id; 1599 their_id = (__u64)xid->xid2_adj_id; 1600 their_id = their_id << 32; 1601 their_id = their_id + xid->xid2_sender_id; 1602 /* lower id assume the xside role */ 1603 if (our_id < their_id) { 1604 grp->roll = XSIDE; 1605 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1606 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1607 CTCM_FUNTAIL, ch->id); 1608 } else { 1609 grp->roll = YSIDE; 1610 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1611 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1612 CTCM_FUNTAIL, ch->id); 1613 } 1614 1615 } else { 1616 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1617 rc = 3; 1618 /* XID REJECTED: xid flag byte4 mismatch */ 1619 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1620 "%s(%s): xid flag byte4 mismatch", 1621 CTCM_FUNTAIL, ch->id); 1622 } 1623 if (xid->xid2_flag2 == 0x40) { 1624 rc = 4; 1625 /* XID REJECTED - xid NOGOOD */ 1626 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1627 "%s(%s): xid NOGOOD", 1628 CTCM_FUNTAIL, ch->id); 1629 } 1630 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1631 rc = 5; 1632 /* XID REJECTED - Adjacent Station ID Mismatch */ 1633 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1634 "%s(%s): Adjacent Station ID Mismatch", 1635 CTCM_FUNTAIL, ch->id); 1636 } 1637 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1638 rc = 6; 1639 /* XID REJECTED - Sender Address Mismatch */ 1640 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1641 "%s(%s): Sender Address Mismatch", 1642 CTCM_FUNTAIL, ch->id); 1643 } 1644 } 1645done: 1646 if (rc) { 1647 dev_warn(&dev->dev, 1648 "The XID used in the MPC protocol is not valid, " 1649 "rc = %d\n", rc); 1650 priv->xid->xid2_flag2 = 0x40; 1651 grp->saved_xid2->xid2_flag2 = 0x40; 1652 } 1653 1654 return rc; 1655} 1656 1657/* 1658 * MPC Group Station FSM action 1659 * CTCM_PROTO_MPC only 1660 */ 1661static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1662{ 1663 struct channel *ch = arg; 1664 int rc = 0; 1665 int gotlock = 0; 1666 unsigned long saveflags = 0; /* avoids compiler warning with 1667 spin_unlock_irqrestore */ 1668 1669 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1670 __func__, smp_processor_id(), ch, ch->id); 1671 1672 if (ctcm_checkalloc_buffer(ch)) 1673 goto done; 1674 1675 /* 1676 * skb data-buffer referencing: 1677 */ 1678 ch->trans_skb->data = ch->trans_skb_data; 1679 skb_reset_tail_pointer(ch->trans_skb); 1680 ch->trans_skb->len = 0; 1681 /* result of the previous 3 statements is NOT always 1682 * already set after ctcm_checkalloc_buffer 1683 * because of possible reuse of the trans_skb 1684 */ 1685 memset(ch->trans_skb->data, 0, 16); 1686 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1687 /* check is main purpose here: */ 1688 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1689 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1690 /* check is main purpose here: */ 1691 skb_put(ch->trans_skb, XID2_LENGTH); 1692 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1693 /* cleanup back to startpoint */ 1694 ch->trans_skb->data = ch->trans_skb_data; 1695 skb_reset_tail_pointer(ch->trans_skb); 1696 ch->trans_skb->len = 0; 1697 1698 /* non-checking rewrite of above skb data-buffer referencing: */ 1699 /* 1700 memset(ch->trans_skb->data, 0, 16); 1701 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1702 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1703 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1704 */ 1705 1706 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1707 ch->ccw[8].count = 0; 1708 ch->ccw[8].cda = 0x00; 1709 1710 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1711 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1712 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1713 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1714 1715 if (side == XSIDE) { 1716 /* mpc_action_xside_xid */ 1717 if (ch->xid_th == NULL) 1718 goto done; 1719 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1720 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1721 ch->ccw[9].count = TH_HEADER_LENGTH; 1722 ch->ccw[9].cda = virt_to_phys(ch->xid_th); 1723 1724 if (ch->xid == NULL) 1725 goto done; 1726 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1727 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1728 ch->ccw[10].count = XID2_LENGTH; 1729 ch->ccw[10].cda = virt_to_phys(ch->xid); 1730 1731 ch->ccw[11].cmd_code = CCW_CMD_READ; 1732 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1733 ch->ccw[11].count = TH_HEADER_LENGTH; 1734 ch->ccw[11].cda = virt_to_phys(ch->rcvd_xid_th); 1735 1736 ch->ccw[12].cmd_code = CCW_CMD_READ; 1737 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1738 ch->ccw[12].count = XID2_LENGTH; 1739 ch->ccw[12].cda = virt_to_phys(ch->rcvd_xid); 1740 1741 ch->ccw[13].cmd_code = CCW_CMD_READ; 1742 ch->ccw[13].cda = virt_to_phys(ch->rcvd_xid_id); 1743 1744 } else { /* side == YSIDE : mpc_action_yside_xid */ 1745 ch->ccw[9].cmd_code = CCW_CMD_READ; 1746 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1747 ch->ccw[9].count = TH_HEADER_LENGTH; 1748 ch->ccw[9].cda = virt_to_phys(ch->rcvd_xid_th); 1749 1750 ch->ccw[10].cmd_code = CCW_CMD_READ; 1751 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1752 ch->ccw[10].count = XID2_LENGTH; 1753 ch->ccw[10].cda = virt_to_phys(ch->rcvd_xid); 1754 1755 if (ch->xid_th == NULL) 1756 goto done; 1757 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1758 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1759 ch->ccw[11].count = TH_HEADER_LENGTH; 1760 ch->ccw[11].cda = virt_to_phys(ch->xid_th); 1761 1762 if (ch->xid == NULL) 1763 goto done; 1764 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1765 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1766 ch->ccw[12].count = XID2_LENGTH; 1767 ch->ccw[12].cda = virt_to_phys(ch->xid); 1768 1769 if (ch->xid_id == NULL) 1770 goto done; 1771 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1772 ch->ccw[13].cda = virt_to_phys(ch->xid_id); 1773 1774 } 1775 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1776 ch->ccw[13].count = 4; 1777 1778 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1779 ch->ccw[14].flags = CCW_FLAG_SLI; 1780 ch->ccw[14].count = 0; 1781 ch->ccw[14].cda = 0; 1782 1783 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1784 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1785 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1786 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1787 1788 if (!in_irq()) { 1789 /* Such conditional locking is a known problem for 1790 * sparse because its static undeterministic. 1791 * Warnings should be ignored here. */ 1792 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1793 gotlock = 1; 1794 } 1795 1796 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1797 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0); 1798 1799 if (gotlock) /* see remark above about conditional locking */ 1800 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1801 1802 if (rc != 0) { 1803 ctcm_ccw_check_rc(ch, rc, 1804 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1805 } 1806 1807done: 1808 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1809 __func__, ch, ch->id); 1810 return; 1811 1812} 1813 1814/* 1815 * MPC Group Station FSM action 1816 * CTCM_PROTO_MPC only 1817 */ 1818static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1819{ 1820 mpc_action_side_xid(fsm, arg, XSIDE); 1821} 1822 1823/* 1824 * MPC Group Station FSM action 1825 * CTCM_PROTO_MPC only 1826 */ 1827static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1828{ 1829 mpc_action_side_xid(fsm, arg, YSIDE); 1830} 1831 1832/* 1833 * MPC Group Station FSM action 1834 * CTCM_PROTO_MPC only 1835 */ 1836static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1837{ 1838 struct channel *ch = arg; 1839 struct net_device *dev = ch->netdev; 1840 struct ctcm_priv *priv = dev->ml_priv; 1841 struct mpc_group *grp = priv->mpcg; 1842 1843 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1844 __func__, smp_processor_id(), ch, ch->id); 1845 1846 if (ch->xid == NULL) { 1847 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1848 "%s(%s): ch->xid == NULL", 1849 CTCM_FUNTAIL, dev->name); 1850 return; 1851 } 1852 1853 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1854 1855 ch->xid->xid2_option = XID2_0; 1856 1857 switch (fsm_getstate(grp->fsm)) { 1858 case MPCG_STATE_XID2INITW: 1859 case MPCG_STATE_XID2INITX: 1860 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1861 break; 1862 case MPCG_STATE_XID0IOWAIT: 1863 case MPCG_STATE_XID0IOWAIX: 1864 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1865 break; 1866 } 1867 1868 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1869 1870 return; 1871} 1872 1873/* 1874 * MPC Group Station FSM action 1875 * CTCM_PROTO_MPC only 1876*/ 1877static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1878{ 1879 struct net_device *dev = arg; 1880 struct ctcm_priv *priv = dev->ml_priv; 1881 struct mpc_group *grp = NULL; 1882 int direction; 1883 int send = 0; 1884 1885 if (priv) 1886 grp = priv->mpcg; 1887 if (grp == NULL) 1888 return; 1889 1890 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1891 struct channel *ch = priv->channel[direction]; 1892 struct xid2 *thisxid = ch->xid; 1893 ch->xid_skb->data = ch->xid_skb_data; 1894 skb_reset_tail_pointer(ch->xid_skb); 1895 ch->xid_skb->len = 0; 1896 thisxid->xid2_option = XID2_7; 1897 send = 0; 1898 1899 /* xid7 phase 1 */ 1900 if (grp->outstanding_xid7_p2 > 0) { 1901 if (grp->roll == YSIDE) { 1902 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1903 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1904 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1905 skb_put_data(ch->xid_skb, &thdummy, 1906 TH_HEADER_LENGTH); 1907 send = 1; 1908 } 1909 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1910 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1911 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1912 skb_put_data(ch->xid_skb, &thnorm, 1913 TH_HEADER_LENGTH); 1914 send = 1; 1915 } 1916 } else { 1917 /* xid7 phase 2 */ 1918 if (grp->roll == YSIDE) { 1919 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1920 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1921 skb_put_data(ch->xid_skb, &thnorm, 1922 TH_HEADER_LENGTH); 1923 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1924 send = 1; 1925 } 1926 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1927 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1928 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1929 skb_put_data(ch->xid_skb, &thdummy, 1930 TH_HEADER_LENGTH); 1931 send = 1; 1932 } 1933 } 1934 1935 if (send) 1936 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1937 } 1938 1939 return; 1940} 1941 1942/* 1943 * MPC Group Station FSM action 1944 * CTCM_PROTO_MPC only 1945 */ 1946static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1947{ 1948 1949 struct mpcg_info *mpcginfo = arg; 1950 struct channel *ch = mpcginfo->ch; 1951 struct net_device *dev = ch->netdev; 1952 struct ctcm_priv *priv = dev->ml_priv; 1953 struct mpc_group *grp = priv->mpcg; 1954 1955 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1956 __func__, ch->id, grp->outstanding_xid2, 1957 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1958 1959 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1960 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1961 1962 grp->outstanding_xid2--; 1963 grp->outstanding_xid7++; 1964 grp->outstanding_xid7_p2++; 1965 1966 /* must change state before validating xid to */ 1967 /* properly handle interim interrupts received*/ 1968 switch (fsm_getstate(grp->fsm)) { 1969 case MPCG_STATE_XID2INITW: 1970 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1971 mpc_validate_xid(mpcginfo); 1972 break; 1973 case MPCG_STATE_XID0IOWAIT: 1974 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1975 mpc_validate_xid(mpcginfo); 1976 break; 1977 case MPCG_STATE_XID2INITX: 1978 if (grp->outstanding_xid2 == 0) { 1979 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1980 mpc_validate_xid(mpcginfo); 1981 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1982 } 1983 break; 1984 case MPCG_STATE_XID0IOWAIX: 1985 if (grp->outstanding_xid2 == 0) { 1986 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1987 mpc_validate_xid(mpcginfo); 1988 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1989 } 1990 break; 1991 } 1992 1993 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1994 __func__, ch->id, grp->outstanding_xid2, 1995 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1996 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 1997 __func__, ch->id, 1998 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 1999 return; 2000 2001} 2002 2003 2004/* 2005 * MPC Group Station FSM action 2006 * CTCM_PROTO_MPC only 2007 */ 2008static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 2009{ 2010 struct mpcg_info *mpcginfo = arg; 2011 struct channel *ch = mpcginfo->ch; 2012 struct net_device *dev = ch->netdev; 2013 struct ctcm_priv *priv = dev->ml_priv; 2014 struct mpc_group *grp = priv->mpcg; 2015 2016 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2017 __func__, smp_processor_id(), ch, ch->id); 2018 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2019 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2020 2021 grp->outstanding_xid7--; 2022 ch->xid_skb->data = ch->xid_skb_data; 2023 skb_reset_tail_pointer(ch->xid_skb); 2024 ch->xid_skb->len = 0; 2025 2026 switch (fsm_getstate(grp->fsm)) { 2027 case MPCG_STATE_XID7INITI: 2028 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2029 mpc_validate_xid(mpcginfo); 2030 break; 2031 case MPCG_STATE_XID7INITW: 2032 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2033 mpc_validate_xid(mpcginfo); 2034 break; 2035 case MPCG_STATE_XID7INITZ: 2036 case MPCG_STATE_XID7INITX: 2037 if (grp->outstanding_xid7 == 0) { 2038 if (grp->outstanding_xid7_p2 > 0) { 2039 grp->outstanding_xid7 = 2040 grp->outstanding_xid7_p2; 2041 grp->outstanding_xid7_p2 = 0; 2042 } else 2043 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2044 2045 mpc_validate_xid(mpcginfo); 2046 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2047 break; 2048 } 2049 mpc_validate_xid(mpcginfo); 2050 break; 2051 } 2052 return; 2053} 2054 2055/* 2056 * mpc_action helper of an MPC Group Station FSM action 2057 * CTCM_PROTO_MPC only 2058 */ 2059static int mpc_send_qllc_discontact(struct net_device *dev) 2060{ 2061 __u32 new_len = 0; 2062 struct sk_buff *skb; 2063 struct qllc *qllcptr; 2064 struct ctcm_priv *priv = dev->ml_priv; 2065 struct mpc_group *grp = priv->mpcg; 2066 2067 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2068 __func__, mpcg_state_names[grp->saved_state]); 2069 2070 switch (grp->saved_state) { 2071 /* 2072 * establish conn callback function is 2073 * preferred method to report failure 2074 */ 2075 case MPCG_STATE_XID0IOWAIT: 2076 case MPCG_STATE_XID0IOWAIX: 2077 case MPCG_STATE_XID7INITI: 2078 case MPCG_STATE_XID7INITZ: 2079 case MPCG_STATE_XID2INITW: 2080 case MPCG_STATE_XID2INITX: 2081 case MPCG_STATE_XID7INITW: 2082 case MPCG_STATE_XID7INITX: 2083 if (grp->estconnfunc) { 2084 grp->estconnfunc(grp->port_num, -1, 0); 2085 grp->estconnfunc = NULL; 2086 break; 2087 } 2088 fallthrough; 2089 case MPCG_STATE_FLOWC: 2090 case MPCG_STATE_READY: 2091 grp->send_qllc_disc = 2; 2092 new_len = sizeof(struct qllc); 2093 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA); 2094 if (qllcptr == NULL) { 2095 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2096 "%s(%s): qllcptr allocation error", 2097 CTCM_FUNTAIL, dev->name); 2098 return -ENOMEM; 2099 } 2100 2101 qllcptr->qllc_address = 0xcc; 2102 qllcptr->qllc_commands = 0x03; 2103 2104 skb = __dev_alloc_skb(new_len, GFP_ATOMIC); 2105 2106 if (skb == NULL) { 2107 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2108 "%s(%s): skb allocation error", 2109 CTCM_FUNTAIL, dev->name); 2110 priv->stats.rx_dropped++; 2111 kfree(qllcptr); 2112 return -ENOMEM; 2113 } 2114 2115 skb_put_data(skb, qllcptr, new_len); 2116 kfree(qllcptr); 2117 2118 if (skb_headroom(skb) < 4) { 2119 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2120 "%s(%s): skb_headroom error", 2121 CTCM_FUNTAIL, dev->name); 2122 dev_kfree_skb_any(skb); 2123 return -ENOMEM; 2124 } 2125 2126 *((__u32 *)skb_push(skb, 4)) = 2127 priv->channel[CTCM_READ]->pdu_seq; 2128 priv->channel[CTCM_READ]->pdu_seq++; 2129 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2130 __func__, priv->channel[CTCM_READ]->pdu_seq); 2131 2132 /* receipt of CC03 resets anticipated sequence number on 2133 receiving side */ 2134 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2135 skb_reset_mac_header(skb); 2136 skb->dev = dev; 2137 skb->protocol = htons(ETH_P_SNAP); 2138 skb->ip_summed = CHECKSUM_UNNECESSARY; 2139 2140 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2141 2142 netif_rx(skb); 2143 break; 2144 default: 2145 break; 2146 2147 } 2148 2149 return 0; 2150} 2151/* --- This is the END my friend --- */ 2152 2153