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ctcm_mpc.c
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linux-6.19.14/drivers/s390/net/ctcm_mpc.c
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 pr_fmt(fmt) "ctcm: " fmt 22 23#include <linux/export.h> 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> 47#include <linux/bitops.h> 48#include <linux/uaccess.h> 49#include <linux/wait.h> 50#include <linux/moduleparam.h> 51#include <asm/ccwdev.h> 52#include <asm/ccwgroup.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 scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr); 148 149 scnprintf(boff, sizeof(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 scnprintf(tbuf, sizeof(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 scnprintf(tdup, sizeof(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 strscpy(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 scnprintf(tdup, sizeof(tdup), 201 "Duplicate as above to %s", addr); 202 ctcm_pr_debug(" --- %s ---\n", tdup); 203 } 204 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 205 addr, boff, bhex, basc); 206 } else { 207 if (dup >= 1) { 208 scnprintf(tdup, sizeof(tdup), 209 "Duplicate as above to %s", addr); 210 ctcm_pr_debug(" --- %s ---\n", tdup); 211 } 212 if (dup != 0) { 213 ctcm_pr_debug(" %s (+%s) : %s [%s]\n", 214 addr, boff, bhex, basc); 215 } 216 } 217 218 return; 219 220} /* end of ctcmpc_dumpit */ 221#endif 222 223#ifdef DEBUGDATA 224/* 225 * Dump header and first 16 bytes of an sk_buff for debugging purposes. 226 * 227 * skb The sk_buff to dump. 228 * offset Offset relative to skb-data, where to start the dump. 229 */ 230void ctcmpc_dump_skb(struct sk_buff *skb, int offset) 231{ 232 __u8 *p = skb->data; 233 struct th_header *header; 234 struct pdu *pheader; 235 int bl = skb->len; 236 int i; 237 238 if (p == NULL) 239 return; 240 241 p += offset; 242 header = (struct th_header *)p; 243 244 ctcm_pr_debug("dump:\n"); 245 ctcm_pr_debug("skb len=%d \n", skb->len); 246 if (skb->len > 2) { 247 switch (header->th_ch_flag) { 248 case TH_HAS_PDU: 249 break; 250 case 0x00: 251 case TH_IS_XID: 252 if ((header->th_blk_flag == TH_DATA_IS_XID) && 253 (header->th_is_xid == 0x01)) 254 goto dumpth; 255 case TH_SWEEP_REQ: 256 goto dumpth; 257 case TH_SWEEP_RESP: 258 goto dumpth; 259 default: 260 break; 261 } 262 263 pheader = (struct pdu *)p; 264 ctcm_pr_debug("pdu->offset: %d hex: %04x\n", 265 pheader->pdu_offset, pheader->pdu_offset); 266 ctcm_pr_debug("pdu->flag : %02x\n", pheader->pdu_flag); 267 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto); 268 ctcm_pr_debug("pdu->seq : %02x\n", pheader->pdu_seq); 269 goto dumpdata; 270 271dumpth: 272 ctcm_pr_debug("th->seg : %02x\n", header->th_seg); 273 ctcm_pr_debug("th->ch : %02x\n", header->th_ch_flag); 274 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag); 275 ctcm_pr_debug("th->type : %s\n", 276 (header->th_is_xid) ? "DATA" : "XID"); 277 ctcm_pr_debug("th->seqnum : %04x\n", header->th_seq_num); 278 279 } 280dumpdata: 281 if (bl > 32) 282 bl = 32; 283 ctcm_pr_debug("data: "); 284 for (i = 0; i < bl; i++) 285 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n"); 286 ctcm_pr_debug("\n"); 287} 288#endif 289 290static struct net_device *ctcmpc_get_dev(int port_num) 291{ 292 char device[20]; 293 struct net_device *dev; 294 struct ctcm_priv *priv; 295 296 scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num); 297 298 dev = __dev_get_by_name(&init_net, device); 299 300 if (dev == NULL) { 301 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 302 "%s: Device not found by name: %s", 303 CTCM_FUNTAIL, device); 304 return NULL; 305 } 306 priv = dev->ml_priv; 307 if (priv == NULL) { 308 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 309 "%s(%s): dev->ml_priv is NULL", 310 CTCM_FUNTAIL, device); 311 return NULL; 312 } 313 if (priv->mpcg == NULL) { 314 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 315 "%s(%s): priv->mpcg is NULL", 316 CTCM_FUNTAIL, device); 317 return NULL; 318 } 319 return dev; 320} 321 322/* 323 * ctc_mpc_alloc_channel 324 * (exported interface) 325 * 326 * Device Initialization : 327 * ACTPATH driven IO operations 328 */ 329int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int)) 330{ 331 struct net_device *dev; 332 struct mpc_group *grp; 333 struct ctcm_priv *priv; 334 335 dev = ctcmpc_get_dev(port_num); 336 if (dev == NULL) 337 return 1; 338 priv = dev->ml_priv; 339 grp = priv->mpcg; 340 341 grp->allochanfunc = callback; 342 grp->port_num = port_num; 343 grp->port_persist = 1; 344 345 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 346 "%s(%s): state=%s", 347 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 348 349 switch (fsm_getstate(grp->fsm)) { 350 case MPCG_STATE_INOP: 351 /* Group is in the process of terminating */ 352 grp->alloc_called = 1; 353 break; 354 case MPCG_STATE_RESET: 355 /* MPC Group will transition to state */ 356 /* MPCG_STATE_XID2INITW iff the minimum number */ 357 /* of 1 read and 1 write channel have successfully*/ 358 /* activated */ 359 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/ 360 if (callback) 361 grp->send_qllc_disc = 1; 362 fallthrough; 363 case MPCG_STATE_XID0IOWAIT: 364 fsm_deltimer(&grp->timer); 365 grp->outstanding_xid2 = 0; 366 grp->outstanding_xid7 = 0; 367 grp->outstanding_xid7_p2 = 0; 368 grp->saved_xid2 = NULL; 369 if (callback) 370 ctcm_open(dev); 371 fsm_event(priv->fsm, DEV_EVENT_START, dev); 372 break; 373 case MPCG_STATE_READY: 374 /* XID exchanges completed after PORT was activated */ 375 /* Link station already active */ 376 /* Maybe timing issue...retry callback */ 377 grp->allocchan_callback_retries++; 378 if (grp->allocchan_callback_retries < 4) { 379 if (grp->allochanfunc) 380 grp->allochanfunc(grp->port_num, 381 grp->group_max_buflen); 382 } else { 383 /* there are problems...bail out */ 384 /* there may be a state mismatch so restart */ 385 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 386 grp->allocchan_callback_retries = 0; 387 } 388 break; 389 } 390 391 return 0; 392} 393EXPORT_SYMBOL(ctc_mpc_alloc_channel); 394 395/* 396 * ctc_mpc_establish_connectivity 397 * (exported interface) 398 */ 399void ctc_mpc_establish_connectivity(int port_num, 400 void (*callback)(int, int, int)) 401{ 402 struct net_device *dev; 403 struct mpc_group *grp; 404 struct ctcm_priv *priv; 405 struct channel *rch, *wch; 406 407 dev = ctcmpc_get_dev(port_num); 408 if (dev == NULL) 409 return; 410 priv = dev->ml_priv; 411 grp = priv->mpcg; 412 rch = priv->channel[CTCM_READ]; 413 wch = priv->channel[CTCM_WRITE]; 414 415 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 416 "%s(%s): state=%s", 417 CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm)); 418 419 grp->estconnfunc = callback; 420 grp->port_num = port_num; 421 422 switch (fsm_getstate(grp->fsm)) { 423 case MPCG_STATE_READY: 424 /* XID exchanges completed after PORT was activated */ 425 /* Link station already active */ 426 /* Maybe timing issue...retry callback */ 427 fsm_deltimer(&grp->timer); 428 grp->estconn_callback_retries++; 429 if (grp->estconn_callback_retries < 4) { 430 if (grp->estconnfunc) { 431 grp->estconnfunc(grp->port_num, 0, 432 grp->group_max_buflen); 433 grp->estconnfunc = NULL; 434 } 435 } else { 436 /* there are problems...bail out */ 437 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 438 grp->estconn_callback_retries = 0; 439 } 440 break; 441 case MPCG_STATE_INOP: 442 case MPCG_STATE_RESET: 443 /* MPC Group is not ready to start XID - min num of */ 444 /* 1 read and 1 write channel have not been acquired*/ 445 446 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 447 "%s(%s): REJECTED - inactive channels", 448 CTCM_FUNTAIL, dev->name); 449 if (grp->estconnfunc) { 450 grp->estconnfunc(grp->port_num, -1, 0); 451 grp->estconnfunc = NULL; 452 } 453 break; 454 case MPCG_STATE_XID2INITW: 455 /* alloc channel was called but no XID exchange */ 456 /* has occurred. initiate xside XID exchange */ 457 /* make sure yside XID0 processing has not started */ 458 459 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) || 460 (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) { 461 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 462 "%s(%s): ABORT - PASSIVE XID", 463 CTCM_FUNTAIL, dev->name); 464 break; 465 } 466 grp->send_qllc_disc = 1; 467 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT); 468 fsm_deltimer(&grp->timer); 469 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE, 470 MPCG_EVENT_TIMER, dev); 471 grp->outstanding_xid7 = 0; 472 grp->outstanding_xid7_p2 = 0; 473 grp->saved_xid2 = NULL; 474 if ((rch->in_mpcgroup) && 475 (fsm_getstate(rch->fsm) == CH_XID0_PENDING)) 476 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch); 477 else { 478 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 479 "%s(%s): RX-%s not ready for ACTIVE XID0", 480 CTCM_FUNTAIL, dev->name, rch->id); 481 if (grp->estconnfunc) { 482 grp->estconnfunc(grp->port_num, -1, 0); 483 grp->estconnfunc = NULL; 484 } 485 fsm_deltimer(&grp->timer); 486 goto done; 487 } 488 if ((wch->in_mpcgroup) && 489 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 490 fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch); 491 else { 492 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 493 "%s(%s): WX-%s not ready for ACTIVE XID0", 494 CTCM_FUNTAIL, dev->name, wch->id); 495 if (grp->estconnfunc) { 496 grp->estconnfunc(grp->port_num, -1, 0); 497 grp->estconnfunc = NULL; 498 } 499 fsm_deltimer(&grp->timer); 500 goto done; 501 } 502 break; 503 case MPCG_STATE_XID0IOWAIT: 504 /* already in active XID negotiations */ 505 default: 506 break; 507 } 508 509done: 510 CTCM_PR_DEBUG("Exit %s()\n", __func__); 511 return; 512} 513EXPORT_SYMBOL(ctc_mpc_establish_connectivity); 514 515/* 516 * ctc_mpc_dealloc_ch 517 * (exported interface) 518 */ 519void ctc_mpc_dealloc_ch(int port_num) 520{ 521 struct net_device *dev; 522 struct ctcm_priv *priv; 523 struct mpc_group *grp; 524 525 dev = ctcmpc_get_dev(port_num); 526 if (dev == NULL) 527 return; 528 priv = dev->ml_priv; 529 grp = priv->mpcg; 530 531 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG, 532 "%s: %s: refcount = %d\n", 533 CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev)); 534 535 fsm_deltimer(&priv->restart_timer); 536 grp->channels_terminating = 0; 537 fsm_deltimer(&grp->timer); 538 grp->allochanfunc = NULL; 539 grp->estconnfunc = NULL; 540 grp->port_persist = 0; 541 grp->send_qllc_disc = 0; 542 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 543 544 ctcm_close(dev); 545 return; 546} 547EXPORT_SYMBOL(ctc_mpc_dealloc_ch); 548 549/* 550 * ctc_mpc_flow_control 551 * (exported interface) 552 */ 553void ctc_mpc_flow_control(int port_num, int flowc) 554{ 555 struct ctcm_priv *priv; 556 struct mpc_group *grp; 557 struct net_device *dev; 558 struct channel *rch; 559 int mpcg_state; 560 561 dev = ctcmpc_get_dev(port_num); 562 if (dev == NULL) 563 return; 564 priv = dev->ml_priv; 565 grp = priv->mpcg; 566 567 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 568 "%s: %s: flowc = %d", 569 CTCM_FUNTAIL, dev->name, flowc); 570 571 rch = priv->channel[CTCM_READ]; 572 573 mpcg_state = fsm_getstate(grp->fsm); 574 switch (flowc) { 575 case 1: 576 if (mpcg_state == MPCG_STATE_FLOWC) 577 break; 578 if (mpcg_state == MPCG_STATE_READY) { 579 if (grp->flow_off_called == 1) 580 grp->flow_off_called = 0; 581 else 582 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC); 583 break; 584 } 585 break; 586 case 0: 587 if (mpcg_state == MPCG_STATE_FLOWC) { 588 fsm_newstate(grp->fsm, MPCG_STATE_READY); 589 /* ensure any data that has accumulated */ 590 /* on the io_queue will now be sen t */ 591 tasklet_schedule(&rch->ch_tasklet); 592 } 593 /* possible race condition */ 594 if (mpcg_state == MPCG_STATE_READY) { 595 grp->flow_off_called = 1; 596 break; 597 } 598 break; 599 } 600 601} 602EXPORT_SYMBOL(ctc_mpc_flow_control); 603 604static int mpc_send_qllc_discontact(struct net_device *); 605 606/* 607 * helper function of ctcmpc_unpack_skb 608*/ 609static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo) 610{ 611 struct channel *rch = mpcginfo->ch; 612 struct net_device *dev = rch->netdev; 613 struct ctcm_priv *priv = dev->ml_priv; 614 struct mpc_group *grp = priv->mpcg; 615 struct channel *ch = priv->channel[CTCM_WRITE]; 616 617 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id); 618 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 619 620 grp->sweep_rsp_pend_num--; 621 622 if ((grp->sweep_req_pend_num == 0) && 623 (grp->sweep_rsp_pend_num == 0)) { 624 fsm_deltimer(&ch->sweep_timer); 625 grp->in_sweep = 0; 626 rch->th_seq_num = 0x00; 627 ch->th_seq_num = 0x00; 628 ctcm_clear_busy_do(dev); 629 } 630 631 return; 632 633} 634 635/* 636 * helper function of mpc_rcvd_sweep_req 637 * which is a helper of ctcmpc_unpack_skb 638 */ 639static void ctcmpc_send_sweep_resp(struct channel *rch) 640{ 641 struct net_device *dev = rch->netdev; 642 struct ctcm_priv *priv = dev->ml_priv; 643 struct mpc_group *grp = priv->mpcg; 644 struct th_sweep *header; 645 struct sk_buff *sweep_skb; 646 struct channel *ch = priv->channel[CTCM_WRITE]; 647 648 CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id); 649 650 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 651 if (sweep_skb == NULL) { 652 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 653 "%s(%s): sweep_skb allocation ERROR\n", 654 CTCM_FUNTAIL, rch->id); 655 goto done; 656 } 657 658 header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH); 659 header->th.th_ch_flag = TH_SWEEP_RESP; 660 header->sw.th_last_seq = ch->th_seq_num; 661 662 netif_trans_update(dev); 663 skb_queue_tail(&ch->sweep_queue, sweep_skb); 664 665 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); 666 667 return; 668 669done: 670 grp->in_sweep = 0; 671 ctcm_clear_busy_do(dev); 672 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 673 674 return; 675} 676 677/* 678 * helper function of ctcmpc_unpack_skb 679 */ 680static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo) 681{ 682 struct channel *rch = mpcginfo->ch; 683 struct net_device *dev = rch->netdev; 684 struct ctcm_priv *priv = dev->ml_priv; 685 struct mpc_group *grp = priv->mpcg; 686 struct channel *ch = priv->channel[CTCM_WRITE]; 687 688 if (do_debug) 689 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 690 " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id); 691 692 if (grp->in_sweep == 0) { 693 grp->in_sweep = 1; 694 ctcm_test_and_set_busy(dev); 695 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ]; 696 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ]; 697 } 698 699 CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH); 700 701 grp->sweep_req_pend_num--; 702 ctcmpc_send_sweep_resp(ch); 703 return; 704} 705 706/* 707 * MPC Group Station FSM definitions 708 */ 709static const char *mpcg_event_names[] = { 710 [MPCG_EVENT_INOP] = "INOP Condition", 711 [MPCG_EVENT_DISCONC] = "Discontact Received", 712 [MPCG_EVENT_XID0DO] = "Channel Active - Start XID", 713 [MPCG_EVENT_XID2] = "XID2 Received", 714 [MPCG_EVENT_XID2DONE] = "XID0 Complete", 715 [MPCG_EVENT_XID7DONE] = "XID7 Complete", 716 [MPCG_EVENT_TIMER] = "XID Setup Timer", 717 [MPCG_EVENT_DOIO] = "XID DoIO", 718}; 719 720static const char *mpcg_state_names[] = { 721 [MPCG_STATE_RESET] = "Reset", 722 [MPCG_STATE_INOP] = "INOP", 723 [MPCG_STATE_XID2INITW] = "Passive XID- XID0 Pending Start", 724 [MPCG_STATE_XID2INITX] = "Passive XID- XID0 Pending Complete", 725 [MPCG_STATE_XID7INITW] = "Passive XID- XID7 Pending P1 Start", 726 [MPCG_STATE_XID7INITX] = "Passive XID- XID7 Pending P2 Complete", 727 [MPCG_STATE_XID0IOWAIT] = "Active XID- XID0 Pending Start", 728 [MPCG_STATE_XID0IOWAIX] = "Active XID- XID0 Pending Complete", 729 [MPCG_STATE_XID7INITI] = "Active XID- XID7 Pending Start", 730 [MPCG_STATE_XID7INITZ] = "Active XID- XID7 Pending Complete ", 731 [MPCG_STATE_XID7INITF] = "XID - XID7 Complete ", 732 [MPCG_STATE_FLOWC] = "FLOW CONTROL ON", 733 [MPCG_STATE_READY] = "READY", 734}; 735 736/* 737 * The MPC Group Station FSM 738 * 22 events 739 */ 740static const fsm_node mpcg_fsm[] = { 741 { MPCG_STATE_RESET, MPCG_EVENT_INOP, mpc_action_go_inop }, 742 { MPCG_STATE_INOP, MPCG_EVENT_INOP, mpc_action_nop }, 743 { MPCG_STATE_FLOWC, MPCG_EVENT_INOP, mpc_action_go_inop }, 744 745 { MPCG_STATE_READY, MPCG_EVENT_DISCONC, mpc_action_discontact }, 746 { MPCG_STATE_READY, MPCG_EVENT_INOP, mpc_action_go_inop }, 747 748 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 749 { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 750 { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 751 { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 752 { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 753 754 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 755 { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 756 { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 757 { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 758 { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 759 760 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 761 { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC, mpc_action_discontact }, 762 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 763 { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP, mpc_action_go_inop }, 764 { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER, mpc_action_timeout }, 765 { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 766 { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 767 768 { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 769 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 770 { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP, mpc_action_go_inop }, 771 { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 772 { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER, mpc_action_timeout }, 773 { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO, mpc_action_yside_xid }, 774 775 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 776 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC, mpc_action_discontact }, 777 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 778 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP, mpc_action_go_inop }, 779 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER, mpc_action_timeout }, 780 { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 781 782 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO, mpc_action_doxid0 }, 783 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC, mpc_action_discontact }, 784 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2, mpc_action_rcvd_xid0 }, 785 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP, mpc_action_go_inop }, 786 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER, mpc_action_timeout }, 787 { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 788 789 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE, mpc_action_doxid7 }, 790 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 791 { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC, mpc_action_discontact }, 792 { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP, mpc_action_go_inop }, 793 { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER, mpc_action_timeout }, 794 { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 795 { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 796 797 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2, mpc_action_rcvd_xid7 }, 798 { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE, mpc_action_doxid7 }, 799 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC, mpc_action_discontact }, 800 { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP, mpc_action_go_inop }, 801 { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER, mpc_action_timeout }, 802 { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO, mpc_action_xside_xid }, 803 804 { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP, mpc_action_go_inop }, 805 { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE, mpc_action_go_ready }, 806}; 807 808static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm); 809 810/* 811 * MPC Group Station FSM action 812 * CTCM_PROTO_MPC only 813 */ 814static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg) 815{ 816 struct net_device *dev = arg; 817 struct ctcm_priv *priv = dev->ml_priv; 818 struct mpc_group *grp = priv->mpcg; 819 820 if (grp == NULL) { 821 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 822 "%s(%s): No MPC group", 823 CTCM_FUNTAIL, dev->name); 824 return; 825 } 826 827 fsm_deltimer(&grp->timer); 828 829 if (grp->saved_xid2->xid2_flag2 == 0x40) { 830 priv->xid->xid2_flag2 = 0x00; 831 if (grp->estconnfunc) { 832 grp->estconnfunc(grp->port_num, 1, 833 grp->group_max_buflen); 834 grp->estconnfunc = NULL; 835 } else if (grp->allochanfunc) 836 grp->send_qllc_disc = 1; 837 838 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 839 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 840 "%s(%s): fails", 841 CTCM_FUNTAIL, dev->name); 842 return; 843 } 844 845 grp->port_persist = 1; 846 grp->out_of_sequence = 0; 847 grp->estconn_called = 0; 848 849 tasklet_hi_schedule(&grp->mpc_tasklet2); 850 851 return; 852} 853 854/* 855 * helper of ctcm_init_netdevice 856 * CTCM_PROTO_MPC only 857 */ 858void mpc_group_ready(unsigned long adev) 859{ 860 struct net_device *dev = (struct net_device *)adev; 861 struct ctcm_priv *priv = dev->ml_priv; 862 struct mpc_group *grp = priv->mpcg; 863 struct channel *ch = NULL; 864 865 if (grp == NULL) { 866 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 867 "%s(%s): No MPC group", 868 CTCM_FUNTAIL, dev->name); 869 return; 870 } 871 872 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 873 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n", 874 CTCM_FUNTAIL, dev->name, grp->group_max_buflen); 875 876 fsm_newstate(grp->fsm, MPCG_STATE_READY); 877 878 /* Put up a read on the channel */ 879 ch = priv->channel[CTCM_READ]; 880 ch->pdu_seq = 0; 881 CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" , 882 __func__, ch->pdu_seq); 883 884 ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch); 885 /* Put the write channel in idle state */ 886 ch = priv->channel[CTCM_WRITE]; 887 if (ch->collect_len > 0) { 888 spin_lock(&ch->collect_lock); 889 ctcm_purge_skb_queue(&ch->collect_queue); 890 ch->collect_len = 0; 891 spin_unlock(&ch->collect_lock); 892 } 893 ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch); 894 ctcm_clear_busy(dev); 895 896 if (grp->estconnfunc) { 897 grp->estconnfunc(grp->port_num, 0, 898 grp->group_max_buflen); 899 grp->estconnfunc = NULL; 900 } else if (grp->allochanfunc) { 901 grp->allochanfunc(grp->port_num, grp->group_max_buflen); 902 } 903 904 grp->send_qllc_disc = 1; 905 grp->changed_side = 0; 906 907 return; 908 909} 910 911/* 912 * Increment the MPC Group Active Channel Counts 913 * helper of dev_action (called from channel fsm) 914 */ 915void mpc_channel_action(struct channel *ch, int direction, int action) 916{ 917 struct net_device *dev = ch->netdev; 918 struct ctcm_priv *priv = dev->ml_priv; 919 struct mpc_group *grp = priv->mpcg; 920 921 if (grp == NULL) { 922 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 923 "%s(%s): No MPC group", 924 CTCM_FUNTAIL, dev->name); 925 return; 926 } 927 928 CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 929 930 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 931 "%s: %i / Grp:%s total_channels=%i, active_channels: " 932 "read=%i, write=%i\n", __func__, action, 933 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 934 grp->active_channels[CTCM_READ], 935 grp->active_channels[CTCM_WRITE]); 936 937 if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) { 938 grp->num_channel_paths++; 939 grp->active_channels[direction]++; 940 grp->outstanding_xid2++; 941 ch->in_mpcgroup = 1; 942 943 if (ch->xid_skb != NULL) 944 dev_kfree_skb_any(ch->xid_skb); 945 946 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, 947 GFP_ATOMIC | GFP_DMA); 948 if (ch->xid_skb == NULL) { 949 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 950 "%s(%s): Couldn't alloc ch xid_skb\n", 951 CTCM_FUNTAIL, dev->name); 952 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 953 return; 954 } 955 ch->xid_skb_data = ch->xid_skb->data; 956 ch->xid_th = (struct th_header *)ch->xid_skb->data; 957 skb_put(ch->xid_skb, TH_HEADER_LENGTH); 958 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb); 959 skb_put(ch->xid_skb, XID2_LENGTH); 960 ch->xid_id = skb_tail_pointer(ch->xid_skb); 961 ch->xid_skb->data = ch->xid_skb_data; 962 skb_reset_tail_pointer(ch->xid_skb); 963 ch->xid_skb->len = 0; 964 965 skb_put_data(ch->xid_skb, grp->xid_skb->data, 966 grp->xid_skb->len); 967 968 ch->xid->xid2_dlc_type = 969 ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) 970 ? XID2_READ_SIDE : XID2_WRITE_SIDE); 971 972 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE) 973 ch->xid->xid2_buf_len = 0x00; 974 975 ch->xid_skb->data = ch->xid_skb_data; 976 skb_reset_tail_pointer(ch->xid_skb); 977 ch->xid_skb->len = 0; 978 979 fsm_newstate(ch->fsm, CH_XID0_PENDING); 980 981 if ((grp->active_channels[CTCM_READ] > 0) && 982 (grp->active_channels[CTCM_WRITE] > 0) && 983 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { 984 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW); 985 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE, 986 "%s: %s: MPC GROUP CHANNELS ACTIVE\n", 987 __func__, dev->name); 988 } 989 } else if ((action == MPC_CHANNEL_REMOVE) && 990 (ch->in_mpcgroup == 1)) { 991 ch->in_mpcgroup = 0; 992 grp->num_channel_paths--; 993 grp->active_channels[direction]--; 994 995 if (ch->xid_skb != NULL) 996 dev_kfree_skb_any(ch->xid_skb); 997 ch->xid_skb = NULL; 998 999 if (grp->channels_terminating) 1000 goto done; 1001 1002 if (((grp->active_channels[CTCM_READ] == 0) && 1003 (grp->active_channels[CTCM_WRITE] > 0)) 1004 || ((grp->active_channels[CTCM_WRITE] == 0) && 1005 (grp->active_channels[CTCM_READ] > 0))) 1006 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1007 } 1008done: 1009 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1010 "exit %s: %i / Grp:%s total_channels=%i, active_channels: " 1011 "read=%i, write=%i\n", __func__, action, 1012 fsm_getstate_str(grp->fsm), grp->num_channel_paths, 1013 grp->active_channels[CTCM_READ], 1014 grp->active_channels[CTCM_WRITE]); 1015 1016 CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id); 1017} 1018 1019/* 1020 * Unpack a just received skb and hand it over to 1021 * upper layers. 1022 * special MPC version of unpack_skb. 1023 * 1024 * ch The channel where this skb has been received. 1025 * pskb The received skb. 1026 */ 1027static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb) 1028{ 1029 struct net_device *dev = ch->netdev; 1030 struct ctcm_priv *priv = dev->ml_priv; 1031 struct mpc_group *grp = priv->mpcg; 1032 struct pdu *curr_pdu; 1033 struct mpcg_info *mpcginfo; 1034 struct th_header *header = NULL; 1035 struct th_sweep *sweep = NULL; 1036 int pdu_last_seen = 0; 1037 __u32 new_len; 1038 struct sk_buff *skb; 1039 int skblen; 1040 int sendrc = 0; 1041 1042 CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n", 1043 __func__, dev->name, smp_processor_id(), ch->id); 1044 1045 header = (struct th_header *)pskb->data; 1046 if ((header->th_seg == 0) && 1047 (header->th_ch_flag == 0) && 1048 (header->th_blk_flag == 0) && 1049 (header->th_seq_num == 0)) 1050 /* nothing for us */ goto done; 1051 1052 CTCM_PR_DBGDATA("%s: th_header\n", __func__); 1053 CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH); 1054 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len); 1055 1056 pskb->dev = dev; 1057 pskb->ip_summed = CHECKSUM_UNNECESSARY; 1058 skb_pull(pskb, TH_HEADER_LENGTH); 1059 1060 if (likely(header->th_ch_flag == TH_HAS_PDU)) { 1061 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__); 1062 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) || 1063 ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) && 1064 (header->th_seq_num != ch->th_seq_num + 1) && 1065 (ch->th_seq_num != 0))) { 1066 /* This is NOT the next segment * 1067 * we are not the correct race winner * 1068 * go away and let someone else win * 1069 * BUT..this only applies if xid negot * 1070 * is done * 1071 */ 1072 grp->out_of_sequence += 1; 1073 __skb_push(pskb, TH_HEADER_LENGTH); 1074 skb_queue_tail(&ch->io_queue, pskb); 1075 CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x " 1076 "got:%08x\n", __func__, 1077 ch->th_seq_num + 1, header->th_seq_num); 1078 1079 return; 1080 } 1081 grp->out_of_sequence = 0; 1082 ch->th_seq_num = header->th_seq_num; 1083 1084 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n", 1085 __func__, ch->th_seq_num); 1086 1087 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY)) 1088 goto done; 1089 while ((pskb->len > 0) && !pdu_last_seen) { 1090 curr_pdu = (struct pdu *)pskb->data; 1091 1092 CTCM_PR_DBGDATA("%s: pdu_header\n", __func__); 1093 CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH); 1094 CTCM_PR_DBGDATA("%s: pskb len: %04x \n", 1095 __func__, pskb->len); 1096 1097 skb_pull(pskb, PDU_HEADER_LENGTH); 1098 1099 if (curr_pdu->pdu_flag & PDU_LAST) 1100 pdu_last_seen = 1; 1101 if (curr_pdu->pdu_flag & PDU_CNTL) 1102 pskb->protocol = htons(ETH_P_SNAP); 1103 else 1104 pskb->protocol = htons(ETH_P_SNA_DIX); 1105 1106 if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) { 1107 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1108 "%s(%s): Dropping packet with " 1109 "illegal siize %d", 1110 CTCM_FUNTAIL, dev->name, pskb->len); 1111 1112 priv->stats.rx_dropped++; 1113 priv->stats.rx_length_errors++; 1114 goto done; 1115 } 1116 skb_reset_mac_header(pskb); 1117 new_len = curr_pdu->pdu_offset; 1118 CTCM_PR_DBGDATA("%s: new_len: %04x \n", 1119 __func__, new_len); 1120 if ((new_len == 0) || (new_len > pskb->len)) { 1121 /* should never happen */ 1122 /* pskb len must be hosed...bail out */ 1123 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1124 "%s(%s): non valid pdu_offset: %04x", 1125 /* "data may be lost", */ 1126 CTCM_FUNTAIL, dev->name, new_len); 1127 goto done; 1128 } 1129 skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC); 1130 1131 if (!skb) { 1132 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1133 "%s(%s): MEMORY allocation error", 1134 CTCM_FUNTAIL, dev->name); 1135 priv->stats.rx_dropped++; 1136 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1137 goto done; 1138 } 1139 skb_put_data(skb, pskb->data, new_len); 1140 1141 skb_reset_mac_header(skb); 1142 skb->dev = pskb->dev; 1143 skb->protocol = pskb->protocol; 1144 skb->ip_summed = CHECKSUM_UNNECESSARY; 1145 *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq; 1146 ch->pdu_seq++; 1147 1148 if (do_debug_data) { 1149 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n", 1150 __func__, ch->pdu_seq); 1151 ctcm_pr_debug("%s: skb:%0lx " 1152 "skb len: %d \n", __func__, 1153 (unsigned long)skb, skb->len); 1154 ctcm_pr_debug("%s: up to 32 bytes " 1155 "of pdu_data sent\n", __func__); 1156 ctcmpc_dump32((char *)skb->data, skb->len); 1157 } 1158 1159 skblen = skb->len; 1160 sendrc = netif_rx(skb); 1161 priv->stats.rx_packets++; 1162 priv->stats.rx_bytes += skblen; 1163 skb_pull(pskb, new_len); /* point to next PDU */ 1164 } 1165 } else { 1166 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC); 1167 if (mpcginfo == NULL) 1168 goto done; 1169 1170 mpcginfo->ch = ch; 1171 mpcginfo->th = header; 1172 mpcginfo->skb = pskb; 1173 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n", 1174 __func__); 1175 /* it's a sweep? */ 1176 sweep = (struct th_sweep *)pskb->data; 1177 mpcginfo->sweep = sweep; 1178 if (header->th_ch_flag == TH_SWEEP_REQ) 1179 mpc_rcvd_sweep_req(mpcginfo); 1180 else if (header->th_ch_flag == TH_SWEEP_RESP) 1181 mpc_rcvd_sweep_resp(mpcginfo); 1182 else if (header->th_blk_flag == TH_DATA_IS_XID) { 1183 struct xid2 *thisxid = (struct xid2 *)pskb->data; 1184 skb_pull(pskb, XID2_LENGTH); 1185 mpcginfo->xid = thisxid; 1186 fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo); 1187 } else if (header->th_blk_flag == TH_DISCONTACT) 1188 fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo); 1189 else if (header->th_seq_num != 0) { 1190 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1191 "%s(%s): control pkt expected\n", 1192 CTCM_FUNTAIL, dev->name); 1193 priv->stats.rx_dropped++; 1194 /* mpcginfo only used for non-data transfers */ 1195 if (do_debug_data) 1196 ctcmpc_dump_skb(pskb, -8); 1197 } 1198 kfree(mpcginfo); 1199 } 1200done: 1201 1202 dev_kfree_skb_any(pskb); 1203 if (sendrc == NET_RX_DROP) { 1204 dev_warn(&dev->dev, 1205 "The network backlog for %s is exceeded, " 1206 "package dropped\n", __func__); 1207 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1208 } 1209 1210 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1211 __func__, dev->name, ch, ch->id); 1212} 1213 1214/* 1215 * tasklet helper for mpc's skb unpacking. 1216 * 1217 * ch The channel to work on. 1218 * Allow flow control back pressure to occur here. 1219 * Throttling back channel can result in excessive 1220 * channel inactivity and system deact of channel 1221 */ 1222void ctcmpc_bh(unsigned long thischan) 1223{ 1224 struct channel *ch = (struct channel *)thischan; 1225 struct sk_buff *skb; 1226 struct net_device *dev = ch->netdev; 1227 struct ctcm_priv *priv = dev->ml_priv; 1228 struct mpc_group *grp = priv->mpcg; 1229 1230 CTCM_PR_DEBUG("%s cp:%i enter: %s() %s\n", 1231 dev->name, smp_processor_id(), __func__, ch->id); 1232 /* caller has requested driver to throttle back */ 1233 while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) && 1234 (skb = skb_dequeue(&ch->io_queue))) { 1235 ctcmpc_unpack_skb(ch, skb); 1236 if (grp->out_of_sequence > 20) { 1237 /* assume data loss has occurred if */ 1238 /* missing seq_num for extended */ 1239 /* period of time */ 1240 grp->out_of_sequence = 0; 1241 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1242 break; 1243 } 1244 if (skb == skb_peek(&ch->io_queue)) 1245 break; 1246 } 1247 CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n", 1248 __func__, dev->name, ch, ch->id); 1249 return; 1250} 1251 1252/* 1253 * MPC Group Initializations 1254 */ 1255struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv) 1256{ 1257 struct mpc_group *grp; 1258 1259 CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO, 1260 "Enter %s(%p)", CTCM_FUNTAIL, priv); 1261 1262 grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL); 1263 if (grp == NULL) 1264 return NULL; 1265 1266 grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names, 1267 MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm, 1268 mpcg_fsm_len, GFP_KERNEL); 1269 if (grp->fsm == NULL) { 1270 kfree(grp); 1271 return NULL; 1272 } 1273 1274 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1275 fsm_settimer(grp->fsm, &grp->timer); 1276 1277 grp->xid_skb = 1278 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA); 1279 if (grp->xid_skb == NULL) { 1280 kfree_fsm(grp->fsm); 1281 kfree(grp); 1282 return NULL; 1283 } 1284 /* base xid for all channels in group */ 1285 grp->xid_skb_data = grp->xid_skb->data; 1286 grp->xid_th = (struct th_header *)grp->xid_skb->data; 1287 skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH); 1288 1289 grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb); 1290 skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH); 1291 grp->xid->xid2_adj_id = jiffies | 0xfff00000; 1292 grp->xid->xid2_sender_id = jiffies; 1293 1294 grp->xid_id = skb_tail_pointer(grp->xid_skb); 1295 skb_put_data(grp->xid_skb, "VTAM", 4); 1296 1297 grp->rcvd_xid_skb = 1298 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); 1299 if (grp->rcvd_xid_skb == NULL) { 1300 kfree_fsm(grp->fsm); 1301 dev_kfree_skb(grp->xid_skb); 1302 kfree(grp); 1303 return NULL; 1304 } 1305 grp->rcvd_xid_data = grp->rcvd_xid_skb->data; 1306 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1307 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1308 grp->saved_xid2 = NULL; 1309 priv->xid = grp->xid; 1310 priv->mpcg = grp; 1311 return grp; 1312} 1313 1314/* 1315 * The MPC Group Station FSM 1316 */ 1317 1318/* 1319 * MPC Group Station FSM actions 1320 * CTCM_PROTO_MPC only 1321 */ 1322 1323/* 1324 * NOP action for statemachines 1325 */ 1326static void mpc_action_nop(fsm_instance *fi, int event, void *arg) 1327{ 1328} 1329 1330/* 1331 * invoked when the device transitions to dev_stopped 1332 * MPC will stop each individual channel if a single XID failure 1333 * occurs, or will intitiate all channels be stopped if a GROUP 1334 * level failure occurs. 1335 */ 1336static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg) 1337{ 1338 struct net_device *dev = arg; 1339 struct ctcm_priv *priv; 1340 struct mpc_group *grp; 1341 struct channel *wch; 1342 1343 CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name); 1344 1345 priv = dev->ml_priv; 1346 grp = priv->mpcg; 1347 grp->flow_off_called = 0; 1348 fsm_deltimer(&grp->timer); 1349 if (grp->channels_terminating) 1350 return; 1351 1352 grp->channels_terminating = 1; 1353 grp->saved_state = fsm_getstate(grp->fsm); 1354 fsm_newstate(grp->fsm, MPCG_STATE_INOP); 1355 if (grp->saved_state > MPCG_STATE_XID7INITF) 1356 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1357 "%s(%s): MPC GROUP INOPERATIVE", 1358 CTCM_FUNTAIL, dev->name); 1359 if ((grp->saved_state != MPCG_STATE_RESET) || 1360 /* dealloc_channel has been called */ 1361 (grp->port_persist == 0)) 1362 fsm_deltimer(&priv->restart_timer); 1363 1364 wch = priv->channel[CTCM_WRITE]; 1365 1366 switch (grp->saved_state) { 1367 case MPCG_STATE_RESET: 1368 case MPCG_STATE_INOP: 1369 case MPCG_STATE_XID2INITW: 1370 case MPCG_STATE_XID0IOWAIT: 1371 case MPCG_STATE_XID2INITX: 1372 case MPCG_STATE_XID7INITW: 1373 case MPCG_STATE_XID7INITX: 1374 case MPCG_STATE_XID0IOWAIX: 1375 case MPCG_STATE_XID7INITI: 1376 case MPCG_STATE_XID7INITZ: 1377 case MPCG_STATE_XID7INITF: 1378 break; 1379 case MPCG_STATE_FLOWC: 1380 case MPCG_STATE_READY: 1381 default: 1382 tasklet_hi_schedule(&wch->ch_disc_tasklet); 1383 } 1384 1385 grp->xid2_tgnum = 0; 1386 grp->group_max_buflen = 0; /*min of all received */ 1387 grp->outstanding_xid2 = 0; 1388 grp->outstanding_xid7 = 0; 1389 grp->outstanding_xid7_p2 = 0; 1390 grp->saved_xid2 = NULL; 1391 grp->xidnogood = 0; 1392 grp->changed_side = 0; 1393 1394 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1395 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1396 grp->rcvd_xid_skb->len = 0; 1397 grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data; 1398 skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH); 1399 1400 if (grp->send_qllc_disc == 1) { 1401 grp->send_qllc_disc = 0; 1402 mpc_send_qllc_discontact(dev); 1403 } 1404 1405 /* DO NOT issue DEV_EVENT_STOP directly out of this code */ 1406 /* This can result in INOP of VTAM PU due to halting of */ 1407 /* outstanding IO which causes a sense to be returned */ 1408 /* Only about 3 senses are allowed and then IOS/VTAM will*/ 1409 /* become unreachable without manual intervention */ 1410 if ((grp->port_persist == 1) || (grp->alloc_called)) { 1411 grp->alloc_called = 0; 1412 fsm_deltimer(&priv->restart_timer); 1413 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev); 1414 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1415 if (grp->saved_state > MPCG_STATE_XID7INITF) 1416 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1417 "%s(%s): MPC GROUP RECOVERY SCHEDULED", 1418 CTCM_FUNTAIL, dev->name); 1419 } else { 1420 fsm_deltimer(&priv->restart_timer); 1421 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev); 1422 fsm_newstate(grp->fsm, MPCG_STATE_RESET); 1423 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS, 1424 "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED", 1425 CTCM_FUNTAIL, dev->name); 1426 } 1427} 1428 1429/* 1430 * Handle mpc group action timeout. 1431 * MPC Group Station FSM action 1432 * CTCM_PROTO_MPC only 1433 * 1434 * fi An instance of an mpc_group fsm. 1435 * event The event, just happened. 1436 * arg Generic pointer, casted from net_device * upon call. 1437 */ 1438static void mpc_action_timeout(fsm_instance *fi, int event, void *arg) 1439{ 1440 struct net_device *dev = arg; 1441 struct ctcm_priv *priv; 1442 struct mpc_group *grp; 1443 struct channel *wch; 1444 struct channel *rch; 1445 1446 priv = dev->ml_priv; 1447 grp = priv->mpcg; 1448 wch = priv->channel[CTCM_WRITE]; 1449 rch = priv->channel[CTCM_READ]; 1450 1451 switch (fsm_getstate(grp->fsm)) { 1452 case MPCG_STATE_XID2INITW: 1453 /* Unless there is outstanding IO on the */ 1454 /* channel just return and wait for ATTN */ 1455 /* interrupt to begin XID negotiations */ 1456 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) && 1457 (fsm_getstate(wch->fsm) == CH_XID0_PENDING)) 1458 break; 1459 fallthrough; 1460 default: 1461 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1462 } 1463 1464 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, 1465 "%s: dev=%s exit", 1466 CTCM_FUNTAIL, dev->name); 1467 return; 1468} 1469 1470/* 1471 * MPC Group Station FSM action 1472 * CTCM_PROTO_MPC only 1473 */ 1474void mpc_action_discontact(fsm_instance *fi, int event, void *arg) 1475{ 1476 struct mpcg_info *mpcginfo = arg; 1477 struct channel *ch = mpcginfo->ch; 1478 struct net_device *dev; 1479 struct ctcm_priv *priv; 1480 struct mpc_group *grp; 1481 1482 if (ch) { 1483 dev = ch->netdev; 1484 if (dev) { 1485 priv = dev->ml_priv; 1486 if (priv) { 1487 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1488 "%s: %s: %s\n", 1489 CTCM_FUNTAIL, dev->name, ch->id); 1490 grp = priv->mpcg; 1491 grp->send_qllc_disc = 1; 1492 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); 1493 } 1494 } 1495 } 1496 1497 return; 1498} 1499 1500/* 1501 * MPC Group Station - not part of FSM 1502 * CTCM_PROTO_MPC only 1503 * called from add_channel in ctcm_main.c 1504 */ 1505void mpc_action_send_discontact(unsigned long thischan) 1506{ 1507 int rc; 1508 struct channel *ch = (struct channel *)thischan; 1509 unsigned long saveflags = 0; 1510 1511 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1512 rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0); 1513 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1514 1515 if (rc != 0) { 1516 ctcm_ccw_check_rc(ch, rc, (char *)__func__); 1517 } 1518 1519 return; 1520} 1521 1522 1523/* 1524 * helper function of mpc FSM 1525 * CTCM_PROTO_MPC only 1526 * mpc_action_rcvd_xid7 1527*/ 1528static int mpc_validate_xid(struct mpcg_info *mpcginfo) 1529{ 1530 struct channel *ch = mpcginfo->ch; 1531 struct net_device *dev = ch->netdev; 1532 struct ctcm_priv *priv = dev->ml_priv; 1533 struct mpc_group *grp = priv->mpcg; 1534 struct xid2 *xid = mpcginfo->xid; 1535 int rc = 0; 1536 __u64 our_id = 0; 1537 __u64 their_id = 0; 1538 int len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; 1539 1540 CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid); 1541 1542 if (xid == NULL) { 1543 rc = 1; 1544 /* XID REJECTED: xid == NULL */ 1545 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1546 "%s(%s): xid = NULL", 1547 CTCM_FUNTAIL, ch->id); 1548 goto done; 1549 } 1550 1551 CTCM_D3_DUMP((char *)xid, XID2_LENGTH); 1552 1553 /*the received direction should be the opposite of ours */ 1554 if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE : 1555 XID2_READ_SIDE) != xid->xid2_dlc_type) { 1556 rc = 2; 1557 /* XID REJECTED: r/w channel pairing mismatch */ 1558 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1559 "%s(%s): r/w channel pairing mismatch", 1560 CTCM_FUNTAIL, ch->id); 1561 goto done; 1562 } 1563 1564 if (xid->xid2_dlc_type == XID2_READ_SIDE) { 1565 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__, 1566 grp->group_max_buflen, xid->xid2_buf_len); 1567 1568 if (grp->group_max_buflen == 0 || grp->group_max_buflen > 1569 xid->xid2_buf_len - len) 1570 grp->group_max_buflen = xid->xid2_buf_len - len; 1571 } 1572 1573 if (grp->saved_xid2 == NULL) { 1574 grp->saved_xid2 = 1575 (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb); 1576 1577 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH); 1578 grp->rcvd_xid_skb->data = grp->rcvd_xid_data; 1579 1580 skb_reset_tail_pointer(grp->rcvd_xid_skb); 1581 grp->rcvd_xid_skb->len = 0; 1582 1583 /* convert two 32 bit numbers into 1 64 bit for id compare */ 1584 our_id = (__u64)priv->xid->xid2_adj_id; 1585 our_id = our_id << 32; 1586 our_id = our_id + priv->xid->xid2_sender_id; 1587 their_id = (__u64)xid->xid2_adj_id; 1588 their_id = their_id << 32; 1589 their_id = their_id + xid->xid2_sender_id; 1590 /* lower id assume the xside role */ 1591 if (our_id < their_id) { 1592 grp->roll = XSIDE; 1593 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1594 "%s(%s): WE HAVE LOW ID - TAKE XSIDE", 1595 CTCM_FUNTAIL, ch->id); 1596 } else { 1597 grp->roll = YSIDE; 1598 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE, 1599 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE", 1600 CTCM_FUNTAIL, ch->id); 1601 } 1602 1603 } else { 1604 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) { 1605 rc = 3; 1606 /* XID REJECTED: xid flag byte4 mismatch */ 1607 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1608 "%s(%s): xid flag byte4 mismatch", 1609 CTCM_FUNTAIL, ch->id); 1610 } 1611 if (xid->xid2_flag2 == 0x40) { 1612 rc = 4; 1613 /* XID REJECTED - xid NOGOOD */ 1614 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1615 "%s(%s): xid NOGOOD", 1616 CTCM_FUNTAIL, ch->id); 1617 } 1618 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) { 1619 rc = 5; 1620 /* XID REJECTED - Adjacent Station ID Mismatch */ 1621 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1622 "%s(%s): Adjacent Station ID Mismatch", 1623 CTCM_FUNTAIL, ch->id); 1624 } 1625 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) { 1626 rc = 6; 1627 /* XID REJECTED - Sender Address Mismatch */ 1628 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1629 "%s(%s): Sender Address Mismatch", 1630 CTCM_FUNTAIL, ch->id); 1631 } 1632 } 1633done: 1634 if (rc) { 1635 dev_warn(&dev->dev, 1636 "The XID used in the MPC protocol is not valid, " 1637 "rc = %d\n", rc); 1638 priv->xid->xid2_flag2 = 0x40; 1639 grp->saved_xid2->xid2_flag2 = 0x40; 1640 } 1641 1642 return rc; 1643} 1644 1645/* 1646 * MPC Group Station FSM action 1647 * CTCM_PROTO_MPC only 1648 */ 1649static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side) 1650{ 1651 struct channel *ch = arg; 1652 int rc = 0; 1653 int gotlock = 0; 1654 unsigned long saveflags = 0; /* avoids compiler warning with 1655 spin_unlock_irqrestore */ 1656 1657 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1658 __func__, smp_processor_id(), ch, ch->id); 1659 1660 if (ctcm_checkalloc_buffer(ch)) 1661 goto done; 1662 1663 /* 1664 * skb data-buffer referencing: 1665 */ 1666 ch->trans_skb->data = ch->trans_skb_data; 1667 skb_reset_tail_pointer(ch->trans_skb); 1668 ch->trans_skb->len = 0; 1669 /* result of the previous 3 statements is NOT always 1670 * already set after ctcm_checkalloc_buffer 1671 * because of possible reuse of the trans_skb 1672 */ 1673 memset(ch->trans_skb->data, 0, 16); 1674 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1675 /* check is main purpose here: */ 1676 skb_put(ch->trans_skb, TH_HEADER_LENGTH); 1677 ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb); 1678 /* check is main purpose here: */ 1679 skb_put(ch->trans_skb, XID2_LENGTH); 1680 ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb); 1681 /* cleanup back to startpoint */ 1682 ch->trans_skb->data = ch->trans_skb_data; 1683 skb_reset_tail_pointer(ch->trans_skb); 1684 ch->trans_skb->len = 0; 1685 1686 /* non-checking rewrite of above skb data-buffer referencing: */ 1687 /* 1688 memset(ch->trans_skb->data, 0, 16); 1689 ch->rcvd_xid_th = (struct th_header *)ch->trans_skb_data; 1690 ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH); 1691 ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH; 1692 */ 1693 1694 ch->ccw[8].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1695 ch->ccw[8].count = 0; 1696 ch->ccw[8].cda = 0x00; 1697 1698 if (!(ch->xid_th && ch->xid && ch->xid_id)) 1699 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO, 1700 "%s(%s): xid_th=%p, xid=%p, xid_id=%p", 1701 CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id); 1702 1703 if (side == XSIDE) { 1704 /* mpc_action_xside_xid */ 1705 if (ch->xid_th == NULL) 1706 goto done; 1707 ch->ccw[9].cmd_code = CCW_CMD_WRITE; 1708 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1709 ch->ccw[9].count = TH_HEADER_LENGTH; 1710 ch->ccw[9].cda = virt_to_dma32(ch->xid_th); 1711 1712 if (ch->xid == NULL) 1713 goto done; 1714 ch->ccw[10].cmd_code = CCW_CMD_WRITE; 1715 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1716 ch->ccw[10].count = XID2_LENGTH; 1717 ch->ccw[10].cda = virt_to_dma32(ch->xid); 1718 1719 ch->ccw[11].cmd_code = CCW_CMD_READ; 1720 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1721 ch->ccw[11].count = TH_HEADER_LENGTH; 1722 ch->ccw[11].cda = virt_to_dma32(ch->rcvd_xid_th); 1723 1724 ch->ccw[12].cmd_code = CCW_CMD_READ; 1725 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1726 ch->ccw[12].count = XID2_LENGTH; 1727 ch->ccw[12].cda = virt_to_dma32(ch->rcvd_xid); 1728 1729 ch->ccw[13].cmd_code = CCW_CMD_READ; 1730 ch->ccw[13].cda = virt_to_dma32(ch->rcvd_xid_id); 1731 1732 } else { /* side == YSIDE : mpc_action_yside_xid */ 1733 ch->ccw[9].cmd_code = CCW_CMD_READ; 1734 ch->ccw[9].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1735 ch->ccw[9].count = TH_HEADER_LENGTH; 1736 ch->ccw[9].cda = virt_to_dma32(ch->rcvd_xid_th); 1737 1738 ch->ccw[10].cmd_code = CCW_CMD_READ; 1739 ch->ccw[10].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1740 ch->ccw[10].count = XID2_LENGTH; 1741 ch->ccw[10].cda = virt_to_dma32(ch->rcvd_xid); 1742 1743 if (ch->xid_th == NULL) 1744 goto done; 1745 ch->ccw[11].cmd_code = CCW_CMD_WRITE; 1746 ch->ccw[11].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1747 ch->ccw[11].count = TH_HEADER_LENGTH; 1748 ch->ccw[11].cda = virt_to_dma32(ch->xid_th); 1749 1750 if (ch->xid == NULL) 1751 goto done; 1752 ch->ccw[12].cmd_code = CCW_CMD_WRITE; 1753 ch->ccw[12].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1754 ch->ccw[12].count = XID2_LENGTH; 1755 ch->ccw[12].cda = virt_to_dma32(ch->xid); 1756 1757 if (ch->xid_id == NULL) 1758 goto done; 1759 ch->ccw[13].cmd_code = CCW_CMD_WRITE; 1760 ch->ccw[13].cda = virt_to_dma32(ch->xid_id); 1761 1762 } 1763 ch->ccw[13].flags = CCW_FLAG_SLI | CCW_FLAG_CC; 1764 ch->ccw[13].count = 4; 1765 1766 ch->ccw[14].cmd_code = CCW_CMD_NOOP; 1767 ch->ccw[14].flags = CCW_FLAG_SLI; 1768 ch->ccw[14].count = 0; 1769 ch->ccw[14].cda = 0; 1770 1771 CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7); 1772 CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH); 1773 CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH); 1774 CTCM_D3_DUMP((char *)ch->xid_id, 4); 1775 1776 if (!in_hardirq()) { 1777 /* Such conditional locking is a known problem for 1778 * sparse because its static undeterministic. 1779 * Warnings should be ignored here. */ 1780 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); 1781 gotlock = 1; 1782 } 1783 1784 fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch); 1785 rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0); 1786 1787 if (gotlock) /* see remark above about conditional locking */ 1788 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); 1789 1790 if (rc != 0) { 1791 ctcm_ccw_check_rc(ch, rc, 1792 (side == XSIDE) ? "x-side XID" : "y-side XID"); 1793 } 1794 1795done: 1796 CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n", 1797 __func__, ch, ch->id); 1798 return; 1799 1800} 1801 1802/* 1803 * MPC Group Station FSM action 1804 * CTCM_PROTO_MPC only 1805 */ 1806static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg) 1807{ 1808 mpc_action_side_xid(fsm, arg, XSIDE); 1809} 1810 1811/* 1812 * MPC Group Station FSM action 1813 * CTCM_PROTO_MPC only 1814 */ 1815static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg) 1816{ 1817 mpc_action_side_xid(fsm, arg, YSIDE); 1818} 1819 1820/* 1821 * MPC Group Station FSM action 1822 * CTCM_PROTO_MPC only 1823 */ 1824static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg) 1825{ 1826 struct channel *ch = arg; 1827 struct net_device *dev = ch->netdev; 1828 struct ctcm_priv *priv = dev->ml_priv; 1829 struct mpc_group *grp = priv->mpcg; 1830 1831 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 1832 __func__, smp_processor_id(), ch, ch->id); 1833 1834 if (ch->xid == NULL) { 1835 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 1836 "%s(%s): ch->xid == NULL", 1837 CTCM_FUNTAIL, dev->name); 1838 return; 1839 } 1840 1841 fsm_newstate(ch->fsm, CH_XID0_INPROGRESS); 1842 1843 ch->xid->xid2_option = XID2_0; 1844 1845 switch (fsm_getstate(grp->fsm)) { 1846 case MPCG_STATE_XID2INITW: 1847 case MPCG_STATE_XID2INITX: 1848 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1849 break; 1850 case MPCG_STATE_XID0IOWAIT: 1851 case MPCG_STATE_XID0IOWAIX: 1852 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1853 break; 1854 } 1855 1856 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1857 1858 return; 1859} 1860 1861/* 1862 * MPC Group Station FSM action 1863 * CTCM_PROTO_MPC only 1864*/ 1865static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg) 1866{ 1867 struct net_device *dev = arg; 1868 struct ctcm_priv *priv = dev->ml_priv; 1869 struct mpc_group *grp = NULL; 1870 int direction; 1871 int send = 0; 1872 1873 if (priv) 1874 grp = priv->mpcg; 1875 if (grp == NULL) 1876 return; 1877 1878 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) { 1879 struct channel *ch = priv->channel[direction]; 1880 struct xid2 *thisxid = ch->xid; 1881 ch->xid_skb->data = ch->xid_skb_data; 1882 skb_reset_tail_pointer(ch->xid_skb); 1883 ch->xid_skb->len = 0; 1884 thisxid->xid2_option = XID2_7; 1885 send = 0; 1886 1887 /* xid7 phase 1 */ 1888 if (grp->outstanding_xid7_p2 > 0) { 1889 if (grp->roll == YSIDE) { 1890 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) { 1891 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1892 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1893 skb_put_data(ch->xid_skb, &thdummy, 1894 TH_HEADER_LENGTH); 1895 send = 1; 1896 } 1897 } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) { 1898 fsm_newstate(ch->fsm, CH_XID7_PENDING2); 1899 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1900 skb_put_data(ch->xid_skb, &thnorm, 1901 TH_HEADER_LENGTH); 1902 send = 1; 1903 } 1904 } else { 1905 /* xid7 phase 2 */ 1906 if (grp->roll == YSIDE) { 1907 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) { 1908 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1909 skb_put_data(ch->xid_skb, &thnorm, 1910 TH_HEADER_LENGTH); 1911 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL; 1912 send = 1; 1913 } 1914 } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) { 1915 fsm_newstate(ch->fsm, CH_XID7_PENDING4); 1916 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD; 1917 skb_put_data(ch->xid_skb, &thdummy, 1918 TH_HEADER_LENGTH); 1919 send = 1; 1920 } 1921 } 1922 1923 if (send) 1924 fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch); 1925 } 1926 1927 return; 1928} 1929 1930/* 1931 * MPC Group Station FSM action 1932 * CTCM_PROTO_MPC only 1933 */ 1934static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg) 1935{ 1936 1937 struct mpcg_info *mpcginfo = arg; 1938 struct channel *ch = mpcginfo->ch; 1939 struct net_device *dev = ch->netdev; 1940 struct ctcm_priv *priv = dev->ml_priv; 1941 struct mpc_group *grp = priv->mpcg; 1942 1943 CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n", 1944 __func__, ch->id, grp->outstanding_xid2, 1945 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1946 1947 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING) 1948 fsm_newstate(ch->fsm, CH_XID7_PENDING); 1949 1950 grp->outstanding_xid2--; 1951 grp->outstanding_xid7++; 1952 grp->outstanding_xid7_p2++; 1953 1954 /* must change state before validating xid to */ 1955 /* properly handle interim interrupts received*/ 1956 switch (fsm_getstate(grp->fsm)) { 1957 case MPCG_STATE_XID2INITW: 1958 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX); 1959 mpc_validate_xid(mpcginfo); 1960 break; 1961 case MPCG_STATE_XID0IOWAIT: 1962 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX); 1963 mpc_validate_xid(mpcginfo); 1964 break; 1965 case MPCG_STATE_XID2INITX: 1966 if (grp->outstanding_xid2 == 0) { 1967 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW); 1968 mpc_validate_xid(mpcginfo); 1969 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1970 } 1971 break; 1972 case MPCG_STATE_XID0IOWAIX: 1973 if (grp->outstanding_xid2 == 0) { 1974 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI); 1975 mpc_validate_xid(mpcginfo); 1976 fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev); 1977 } 1978 break; 1979 } 1980 1981 CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n", 1982 __func__, ch->id, grp->outstanding_xid2, 1983 grp->outstanding_xid7, grp->outstanding_xid7_p2); 1984 CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n", 1985 __func__, ch->id, 1986 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm)); 1987 return; 1988 1989} 1990 1991 1992/* 1993 * MPC Group Station FSM action 1994 * CTCM_PROTO_MPC only 1995 */ 1996static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg) 1997{ 1998 struct mpcg_info *mpcginfo = arg; 1999 struct channel *ch = mpcginfo->ch; 2000 struct net_device *dev = ch->netdev; 2001 struct ctcm_priv *priv = dev->ml_priv; 2002 struct mpc_group *grp = priv->mpcg; 2003 2004 CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n", 2005 __func__, smp_processor_id(), ch, ch->id); 2006 CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n", 2007 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2); 2008 2009 grp->outstanding_xid7--; 2010 ch->xid_skb->data = ch->xid_skb_data; 2011 skb_reset_tail_pointer(ch->xid_skb); 2012 ch->xid_skb->len = 0; 2013 2014 switch (fsm_getstate(grp->fsm)) { 2015 case MPCG_STATE_XID7INITI: 2016 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ); 2017 mpc_validate_xid(mpcginfo); 2018 break; 2019 case MPCG_STATE_XID7INITW: 2020 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX); 2021 mpc_validate_xid(mpcginfo); 2022 break; 2023 case MPCG_STATE_XID7INITZ: 2024 case MPCG_STATE_XID7INITX: 2025 if (grp->outstanding_xid7 == 0) { 2026 if (grp->outstanding_xid7_p2 > 0) { 2027 grp->outstanding_xid7 = 2028 grp->outstanding_xid7_p2; 2029 grp->outstanding_xid7_p2 = 0; 2030 } else 2031 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF); 2032 2033 mpc_validate_xid(mpcginfo); 2034 fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev); 2035 break; 2036 } 2037 mpc_validate_xid(mpcginfo); 2038 break; 2039 } 2040 return; 2041} 2042 2043/* 2044 * mpc_action helper of an MPC Group Station FSM action 2045 * CTCM_PROTO_MPC only 2046 */ 2047static int mpc_send_qllc_discontact(struct net_device *dev) 2048{ 2049 struct sk_buff *skb; 2050 struct qllc *qllcptr; 2051 struct ctcm_priv *priv = dev->ml_priv; 2052 struct mpc_group *grp = priv->mpcg; 2053 2054 CTCM_PR_DEBUG("%s: GROUP STATE: %s\n", 2055 __func__, mpcg_state_names[grp->saved_state]); 2056 2057 switch (grp->saved_state) { 2058 /* 2059 * establish conn callback function is 2060 * preferred method to report failure 2061 */ 2062 case MPCG_STATE_XID0IOWAIT: 2063 case MPCG_STATE_XID0IOWAIX: 2064 case MPCG_STATE_XID7INITI: 2065 case MPCG_STATE_XID7INITZ: 2066 case MPCG_STATE_XID2INITW: 2067 case MPCG_STATE_XID2INITX: 2068 case MPCG_STATE_XID7INITW: 2069 case MPCG_STATE_XID7INITX: 2070 if (grp->estconnfunc) { 2071 grp->estconnfunc(grp->port_num, -1, 0); 2072 grp->estconnfunc = NULL; 2073 break; 2074 } 2075 fallthrough; 2076 case MPCG_STATE_FLOWC: 2077 case MPCG_STATE_READY: 2078 grp->send_qllc_disc = 2; 2079 2080 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC); 2081 if (skb == NULL) { 2082 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2083 "%s(%s): skb allocation error", 2084 CTCM_FUNTAIL, dev->name); 2085 priv->stats.rx_dropped++; 2086 return -ENOMEM; 2087 } 2088 2089 qllcptr = skb_put(skb, sizeof(struct qllc)); 2090 qllcptr->qllc_address = 0xcc; 2091 qllcptr->qllc_commands = 0x03; 2092 2093 if (skb_headroom(skb) < 4) { 2094 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, 2095 "%s(%s): skb_headroom error", 2096 CTCM_FUNTAIL, dev->name); 2097 dev_kfree_skb_any(skb); 2098 return -ENOMEM; 2099 } 2100 2101 *((__u32 *)skb_push(skb, 4)) = 2102 priv->channel[CTCM_READ]->pdu_seq; 2103 priv->channel[CTCM_READ]->pdu_seq++; 2104 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n", 2105 __func__, priv->channel[CTCM_READ]->pdu_seq); 2106 2107 /* receipt of CC03 resets anticipated sequence number on 2108 receiving side */ 2109 priv->channel[CTCM_READ]->pdu_seq = 0x00; 2110 skb_reset_mac_header(skb); 2111 skb->dev = dev; 2112 skb->protocol = htons(ETH_P_SNAP); 2113 skb->ip_summed = CHECKSUM_UNNECESSARY; 2114 2115 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4)); 2116 2117 netif_rx(skb); 2118 break; 2119 default: 2120 break; 2121 2122 } 2123 2124 return 0; 2125} 2126/* --- This is the END my friend --- */ 2127
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