git.oblomov.eu Git - linux-2.6/blob - drivers/s390/net/ctcm_mpc.c

   1 /*
   2  *      drivers/s390/net/ctcm_mpc.c
   3  *
   4  *      Copyright IBM Corp. 2004, 2007
   5  *      Authors:        Belinda Thompson (belindat@us.ibm.com)
   6  *                      Andy Richter (richtera@us.ibm.com)
   7  *                      Peter Tiedemann (ptiedem@de.ibm.com)
   8  */
   9
  10 /*
  11         This module exports functions to be used by CCS:
  12         EXPORT_SYMBOL(ctc_mpc_alloc_channel);
  13         EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
  14         EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
  15         EXPORT_SYMBOL(ctc_mpc_flow_control);
  16 */
  17
  18 #undef DEBUG
  19 #undef DEBUGDATA
  20 #undef DEBUGCCW
  21
  22 #define KMSG_COMPONENT "ctcm"
  23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/timer.h>
  33 #include <linux/sched.h>
  34
  35 #include <linux/signal.h>
  36 #include <linux/string.h>
  37 #include <linux/proc_fs.h>
  38
  39 #include <linux/ip.h>
  40 #include <linux/if_arp.h>
  41 #include <linux/tcp.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/ctype.h>
  44 #include <linux/netdevice.h>
  45 #include <net/dst.h>
  46
  47 #include <linux/io.h>           /* instead of <asm/io.h> ok ? */
  48 #include <asm/ccwdev.h>
  49 #include <asm/ccwgroup.h>
  50 #include <linux/bitops.h>       /* instead of <asm/bitops.h> ok ? */
  51 #include <linux/uaccess.h>      /* instead of <asm/uaccess.h> ok ? */
  52 #include <linux/wait.h>
  53 #include <linux/moduleparam.h>
  54 #include <asm/idals.h>
  55
  56 #include "cu3088.h"
  57 #include "ctcm_mpc.h"
  58 #include "ctcm_main.h"
  59 #include "ctcm_fsms.h"
  60
  61 static const struct xid2 init_xid = {
  62         .xid2_type_id   =       XID_FM2,
  63         .xid2_len       =       0x45,
  64         .xid2_adj_id    =       0,
  65         .xid2_rlen      =       0x31,
  66         .xid2_resv1     =       0,
  67         .xid2_flag1     =       0,
  68         .xid2_fmtt      =       0,
  69         .xid2_flag4     =       0x80,
  70         .xid2_resv2     =       0,
  71         .xid2_tgnum     =       0,
  72         .xid2_sender_id =       0,
  73         .xid2_flag2     =       0,
  74         .xid2_option    =       XID2_0,
  75         .xid2_resv3     =       "\x00",
  76         .xid2_resv4     =       0,
  77         .xid2_dlc_type  =       XID2_READ_SIDE,
  78         .xid2_resv5     =       0,
  79         .xid2_mpc_flag  =       0,
  80         .xid2_resv6     =       0,
  81         .xid2_buf_len   =       (MPC_BUFSIZE_DEFAULT - 35),
  82 };
  83
  84 static const struct th_header thnorm = {
  85         .th_seg         =       0x00,
  86         .th_ch_flag     =       TH_IS_XID,
  87         .th_blk_flag    =       TH_DATA_IS_XID,
  88         .th_is_xid      =       0x01,
  89         .th_seq_num     =       0x00000000,
  90 };
  91
  92 static const struct th_header thdummy = {
  93         .th_seg         =       0x00,
  94         .th_ch_flag     =       0x00,
  95         .th_blk_flag    =       TH_DATA_IS_XID,
  96         .th_is_xid      =       0x01,
  97         .th_seq_num     =       0x00000000,
  98 };
  99
 100 /*
 101  * Definition of one MPC group
 102  */
 103
 104 /*
 105  * Compatibility macros for busy handling
 106  * of network devices.
 107  */
 108
 109 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 110
 111 /*
 112  * MPC Group state machine actions (static prototypes)
 113  */
 114 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
 115 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
 116 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
 117 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
 118 static int  mpc_validate_xid(struct mpcg_info *mpcginfo);
 119 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
 120 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
 121 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
 122 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
 123 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
 124 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
 125
 126 #ifdef DEBUGDATA
 127 /*-------------------------------------------------------------------*
 128 * Dump buffer format                                                 *
 129 *                                                                    *
 130 *--------------------------------------------------------------------*/
 131 void ctcmpc_dumpit(char *buf, int len)
 132 {
 133         __u32   ct, sw, rm, dup;
 134         char    *ptr, *rptr;
 135         char    tbuf[82], tdup[82];
 136         #if (UTS_MACHINE == s390x)
 137         char    addr[22];
 138         #else
 139         char    addr[12];
 140         #endif
 141         char    boff[12];
 142         char    bhex[82], duphex[82];
 143         char    basc[40];
 144
 145         sw  = 0;
 146         rptr = ptr = buf;
 147         rm  = 16;
 148         duphex[0] = 0x00;
 149         dup = 0;
 150
 151         for (ct = 0; ct < len; ct++, ptr++, rptr++) {
 152                 if (sw == 0) {
 153                         #if (UTS_MACHINE == s390x)
 154                         sprintf(addr, "%16.16lx", (__u64)rptr);
 155                         #else
 156                         sprintf(addr, "%8.8X", (__u32)rptr);
 157                         #endif
 158
 159                         sprintf(boff, "%4.4X", (__u32)ct);
 160                         bhex[0] = '\0';
 161                         basc[0] = '\0';
 162                 }
 163                 if ((sw == 4) || (sw == 12))
 164                         strcat(bhex, " ");
 165                 if (sw == 8)
 166                         strcat(bhex, "  ");
 167
 168                 #if (UTS_MACHINE == s390x)
 169                 sprintf(tbuf, "%2.2lX", (__u64)*ptr);
 170                 #else
 171                 sprintf(tbuf, "%2.2X", (__u32)*ptr);
 172                 #endif
 173
 174                 tbuf[2] = '\0';
 175                 strcat(bhex, tbuf);
 176                 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
 177                         basc[sw] = *ptr;
 178                 else
 179                         basc[sw] = '.';
 180
 181                 basc[sw+1] = '\0';
 182                 sw++;
 183                 rm--;
 184                 if (sw != 16)
 185                         continue;
 186                 if ((strcmp(duphex, bhex)) != 0) {
 187                         if (dup != 0) {
 188                                 sprintf(tdup,
 189                                         "Duplicate as above to %s", addr);
 190                                 ctcm_pr_debug("                --- %s ---\n",
 191                                                 tdup);
 192                         }
 193                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 194                                         addr, boff, bhex, basc);
 195                         dup = 0;
 196                         strcpy(duphex, bhex);
 197                 } else
 198                         dup++;
 199
 200                 sw = 0;
 201                 rm = 16;
 202         }  /* endfor */
 203
 204         if (sw != 0) {
 205                 for ( ; rm > 0; rm--, sw++) {
 206                         if ((sw == 4) || (sw == 12))
 207                                 strcat(bhex, " ");
 208                         if (sw == 8)
 209                                 strcat(bhex, "  ");
 210                         strcat(bhex, "  ");
 211                         strcat(basc, " ");
 212                 }
 213                 if (dup != 0) {
 214                         sprintf(tdup, "Duplicate as above to %s", addr);
 215                         ctcm_pr_debug("                --- %s ---\n", tdup);
 216                 }
 217                 ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 218                                         addr, boff, bhex, basc);
 219         } else {
 220                 if (dup >= 1) {
 221                         sprintf(tdup, "Duplicate as above to %s", addr);
 222                         ctcm_pr_debug("                --- %s ---\n", tdup);
 223                 }
 224                 if (dup != 0) {
 225                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 226                                 addr, boff, bhex, basc);
 227                 }
 228         }
 229
 230         return;
 231
 232 }   /*   end of ctcmpc_dumpit  */
 233 #endif
 234
 235 #ifdef DEBUGDATA
 236 /*
 237  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 238  *
 239  * skb          The sk_buff to dump.
 240  * offset       Offset relative to skb-data, where to start the dump.
 241  */
 242 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
 243 {
 244         __u8 *p = skb->data;
 245         struct th_header *header;
 246         struct pdu *pheader;
 247         int bl = skb->len;
 248         int i;
 249
 250         if (p == NULL)
 251                 return;
 252
 253         p += offset;
 254         header = (struct th_header *)p;
 255
 256         ctcm_pr_debug("dump:\n");
 257         ctcm_pr_debug("skb len=%d \n", skb->len);
 258         if (skb->len > 2) {
 259                 switch (header->th_ch_flag) {
 260                 case TH_HAS_PDU:
 261                         break;
 262                 case 0x00:
 263                 case TH_IS_XID:
 264                         if ((header->th_blk_flag == TH_DATA_IS_XID) &&
 265                            (header->th_is_xid == 0x01))
 266                                 goto dumpth;
 267                 case TH_SWEEP_REQ:
 268                                 goto dumpth;
 269                 case TH_SWEEP_RESP:
 270                                 goto dumpth;
 271                 default:
 272                         break;
 273                 }
 274
 275                 pheader = (struct pdu *)p;
 276                 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
 277                                pheader->pdu_offset, pheader->pdu_offset);
 278                 ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
 279                 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
 280                 ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
 281                                         goto dumpdata;
 282
 283 dumpth:
 284                 ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
 285                 ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
 286                 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
 287                 ctcm_pr_debug("th->type    : %s\n",
 288                                (header->th_is_xid) ? "DATA" : "XID");
 289                 ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
 290
 291         }
 292 dumpdata:
 293         if (bl > 32)
 294                 bl = 32;
 295         ctcm_pr_debug("data: ");
 296         for (i = 0; i < bl; i++)
 297                 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
 298         ctcm_pr_debug("\n");
 299 }
 300 #endif
 301
 302 static struct net_device *ctcmpc_get_dev(int port_num)
 303 {
 304         char device[20];
 305         struct net_device *dev;
 306         struct ctcm_priv *priv;
 307
 308         sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
 309
 310         dev = __dev_get_by_name(&init_net, device);
 311
 312         if (dev == NULL) {
 313                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 314                         "%s: Device not found by name: %s",
 315                                         CTCM_FUNTAIL, device);
 316                 return NULL;
 317         }
 318         priv = dev->ml_priv;
 319         if (priv == NULL) {
 320                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 321                         "%s(%s): dev->ml_priv is NULL",
 322                                         CTCM_FUNTAIL, device);
 323                 return NULL;
 324         }
 325         if (priv->mpcg == NULL) {
 326                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 327                         "%s(%s): priv->mpcg is NULL",
 328                                         CTCM_FUNTAIL, device);
 329                 return NULL;
 330         }
 331         return dev;
 332 }
 333
 334 /*
 335  * ctc_mpc_alloc_channel
 336  *      (exported interface)
 337  *
 338  * Device Initialization :
 339  *      ACTPATH  driven IO operations
 340  */
 341 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
 342 {
 343         struct net_device *dev;
 344         struct mpc_group *grp;
 345         struct ctcm_priv *priv;
 346
 347         dev = ctcmpc_get_dev(port_num);
 348         if (dev == NULL)
 349                 return 1;
 350         priv = dev->ml_priv;
 351         grp = priv->mpcg;
 352
 353         grp->allochanfunc = callback;
 354         grp->port_num = port_num;
 355         grp->port_persist = 1;
 356
 357         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 358                         "%s(%s): state=%s",
 359                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 360
 361         switch (fsm_getstate(grp->fsm)) {
 362         case MPCG_STATE_INOP:
 363                 /* Group is in the process of terminating */
 364                 grp->alloc_called = 1;
 365                 break;
 366         case MPCG_STATE_RESET:
 367                 /* MPC Group will transition to state             */
 368                 /* MPCG_STATE_XID2INITW iff the minimum number    */
 369                 /* of 1 read and 1 write channel have successfully*/
 370                 /* activated                                      */
 371                 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
 372                 if (callback)
 373                         grp->send_qllc_disc = 1;
 374         case MPCG_STATE_XID0IOWAIT:
 375                 fsm_deltimer(&grp->timer);
 376                 grp->outstanding_xid2 = 0;
 377                 grp->outstanding_xid7 = 0;
 378                 grp->outstanding_xid7_p2 = 0;
 379                 grp->saved_xid2 = NULL;
 380                 if (callback)
 381                         ctcm_open(dev);
 382                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 383                 break;
 384         case MPCG_STATE_READY:
 385                 /* XID exchanges completed after PORT was activated */
 386                 /* Link station already active                      */
 387                 /* Maybe timing issue...retry callback              */
 388                 grp->allocchan_callback_retries++;
 389                 if (grp->allocchan_callback_retries < 4) {
 390                         if (grp->allochanfunc)
 391                                 grp->allochanfunc(grp->port_num,
 392                                                   grp->group_max_buflen);
 393                 } else {
 394                         /* there are problems...bail out            */
 395                         /* there may be a state mismatch so restart */
 396                         grp->port_persist = 1;
 397                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 398                         grp->allocchan_callback_retries = 0;
 399                 }
 400                 break;
 401         }
 402
 403         return 0;
 404 }
 405 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 406
 407 /*
 408  * ctc_mpc_establish_connectivity
 409  *      (exported interface)
 410  */
 411 void ctc_mpc_establish_connectivity(int port_num,
 412                                 void (*callback)(int, int, int))
 413 {
 414         struct net_device *dev;
 415         struct mpc_group *grp;
 416         struct ctcm_priv *priv;
 417         struct channel *rch, *wch;
 418
 419         dev = ctcmpc_get_dev(port_num);
 420         if (dev == NULL)
 421                 return;
 422         priv = dev->ml_priv;
 423         grp = priv->mpcg;
 424         rch = priv->channel[READ];
 425         wch = priv->channel[WRITE];
 426
 427         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 428                         "%s(%s): state=%s",
 429                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 430
 431         grp->estconnfunc = callback;
 432         grp->port_num = port_num;
 433
 434         switch (fsm_getstate(grp->fsm)) {
 435         case MPCG_STATE_READY:
 436                 /* XID exchanges completed after PORT was activated */
 437                 /* Link station already active                      */
 438                 /* Maybe timing issue...retry callback              */
 439                 fsm_deltimer(&grp->timer);
 440                 grp->estconn_callback_retries++;
 441                 if (grp->estconn_callback_retries < 4) {
 442                         if (grp->estconnfunc) {
 443                                 grp->estconnfunc(grp->port_num, 0,
 444                                                 grp->group_max_buflen);
 445                                 grp->estconnfunc = NULL;
 446                         }
 447                 } else {
 448                         /* there are problems...bail out         */
 449                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 450                         grp->estconn_callback_retries = 0;
 451                 }
 452                 break;
 453         case MPCG_STATE_INOP:
 454         case MPCG_STATE_RESET:
 455                 /* MPC Group is not ready to start XID - min num of */
 456                 /* 1 read and 1 write channel have not been acquired*/
 457
 458                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 459                         "%s(%s): REJECTED - inactive channels",
 460                                         CTCM_FUNTAIL, dev->name);
 461                 if (grp->estconnfunc) {
 462                         grp->estconnfunc(grp->port_num, -1, 0);
 463                         grp->estconnfunc = NULL;
 464                 }
 465                 break;
 466         case MPCG_STATE_XID2INITW:
 467                 /* alloc channel was called but no XID exchange    */
 468                 /* has occurred. initiate xside XID exchange       */
 469                 /* make sure yside XID0 processing has not started */
 470
 471                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 472                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 473                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 474                                 "%s(%s): ABORT - PASSIVE XID",
 475                                         CTCM_FUNTAIL, dev->name);
 476                         break;
 477                 }
 478                 grp->send_qllc_disc = 1;
 479                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 480                 fsm_deltimer(&grp->timer);
 481                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 482                                                 MPCG_EVENT_TIMER, dev);
 483                 grp->outstanding_xid7 = 0;
 484                 grp->outstanding_xid7_p2 = 0;
 485                 grp->saved_xid2 = NULL;
 486                 if ((rch->in_mpcgroup) &&
 487                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 488                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 489                 else {
 490                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 491                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 492                                         CTCM_FUNTAIL, dev->name, rch->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                 if ((wch->in_mpcgroup) &&
 501                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 502                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 503                 else {
 504                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 505                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 506                                         CTCM_FUNTAIL, dev->name, wch->id);
 507                         if (grp->estconnfunc) {
 508                                 grp->estconnfunc(grp->port_num, -1, 0);
 509                                 grp->estconnfunc = NULL;
 510                         }
 511                         fsm_deltimer(&grp->timer);
 512                                 goto done;
 513                         }
 514                 break;
 515         case MPCG_STATE_XID0IOWAIT:
 516                 /* already in active XID negotiations */
 517         default:
 518                 break;
 519         }
 520
 521 done:
 522         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 523         return;
 524 }
 525 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 526
 527 /*
 528  * ctc_mpc_dealloc_ch
 529  *      (exported interface)
 530  */
 531 void ctc_mpc_dealloc_ch(int port_num)
 532 {
 533         struct net_device *dev;
 534         struct ctcm_priv *priv;
 535         struct mpc_group *grp;
 536
 537         dev = ctcmpc_get_dev(port_num);
 538         if (dev == NULL)
 539                 return;
 540         priv = dev->ml_priv;
 541         grp = priv->mpcg;
 542
 543         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 544                         "%s: %s: refcount = %d\n",
 545                         CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt));
 546
 547         fsm_deltimer(&priv->restart_timer);
 548         grp->channels_terminating = 0;
 549         fsm_deltimer(&grp->timer);
 550         grp->allochanfunc = NULL;
 551         grp->estconnfunc = NULL;
 552         grp->port_persist = 0;
 553         grp->send_qllc_disc = 0;
 554         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 555
 556         ctcm_close(dev);
 557         return;
 558 }
 559 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 560
 561 /*
 562  * ctc_mpc_flow_control
 563  *      (exported interface)
 564  */
 565 void ctc_mpc_flow_control(int port_num, int flowc)
 566 {
 567         struct ctcm_priv *priv;
 568         struct mpc_group *grp;
 569         struct net_device *dev;
 570         struct channel *rch;
 571         int mpcg_state;
 572
 573         dev = ctcmpc_get_dev(port_num);
 574         if (dev == NULL)
 575                 return;
 576         priv = dev->ml_priv;
 577         grp = priv->mpcg;
 578
 579         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 580                         "%s: %s: flowc = %d",
 581                                 CTCM_FUNTAIL, dev->name, flowc);
 582
 583         rch = priv->channel[READ];
 584
 585         mpcg_state = fsm_getstate(grp->fsm);
 586         switch (flowc) {
 587         case 1:
 588                 if (mpcg_state == MPCG_STATE_FLOWC)
 589                         break;
 590                 if (mpcg_state == MPCG_STATE_READY) {
 591                         if (grp->flow_off_called == 1)
 592                                 grp->flow_off_called = 0;
 593                         else
 594                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 595                         break;
 596                 }
 597                 break;
 598         case 0:
 599                 if (mpcg_state == MPCG_STATE_FLOWC) {
 600                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 601                         /* ensure any data that has accumulated */
 602                         /* on the io_queue will now be sen t    */
 603                         tasklet_schedule(&rch->ch_tasklet);
 604                 }
 605                 /* possible race condition                      */
 606                 if (mpcg_state == MPCG_STATE_READY) {
 607                         grp->flow_off_called = 1;
 608                         break;
 609                 }
 610                 break;
 611         }
 612
 613 }
 614 EXPORT_SYMBOL(ctc_mpc_flow_control);
 615
 616 static int mpc_send_qllc_discontact(struct net_device *);
 617
 618 /*
 619  * helper function of ctcmpc_unpack_skb
 620 */
 621 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 622 {
 623         struct channel    *rch = mpcginfo->ch;
 624         struct net_device *dev = rch->netdev;
 625         struct ctcm_priv   *priv = dev->ml_priv;
 626         struct mpc_group  *grp = priv->mpcg;
 627         struct channel    *ch = priv->channel[WRITE];
 628
 629         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 630         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 631
 632         grp->sweep_rsp_pend_num--;
 633
 634         if ((grp->sweep_req_pend_num == 0) &&
 635                         (grp->sweep_rsp_pend_num == 0)) {
 636                 fsm_deltimer(&ch->sweep_timer);
 637                 grp->in_sweep = 0;
 638                 rch->th_seq_num = 0x00;
 639                 ch->th_seq_num = 0x00;
 640                 ctcm_clear_busy_do(dev);
 641         }
 642
 643         kfree(mpcginfo);
 644
 645         return;
 646
 647 }
 648
 649 /*
 650  * helper function of mpc_rcvd_sweep_req
 651  * which is a helper of ctcmpc_unpack_skb
 652  */
 653 static void ctcmpc_send_sweep_resp(struct channel *rch)
 654 {
 655         struct net_device *dev = rch->netdev;
 656         struct ctcm_priv *priv = dev->ml_priv;
 657         struct mpc_group *grp = priv->mpcg;
 658         int rc = 0;
 659         struct th_sweep *header;
 660         struct sk_buff *sweep_skb;
 661         struct channel *ch  = priv->channel[WRITE];
 662
 663         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 664
 665         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 666         if (sweep_skb == NULL) {
 667                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 668                         "%s(%s): sweep_skb allocation ERROR\n",
 669                         CTCM_FUNTAIL, rch->id);
 670                 rc = -ENOMEM;
 671                                 goto done;
 672         }
 673
 674         header = (struct th_sweep *)
 675                         kmalloc(sizeof(struct th_sweep), gfp_type());
 676
 677         if (!header) {
 678                 dev_kfree_skb_any(sweep_skb);
 679                 rc = -ENOMEM;
 680                                 goto done;
 681         }
 682
 683         header->th.th_seg       = 0x00 ;
 684         header->th.th_ch_flag   = TH_SWEEP_RESP;
 685         header->th.th_blk_flag  = 0x00;
 686         header->th.th_is_xid    = 0x00;
 687         header->th.th_seq_num   = 0x00;
 688         header->sw.th_last_seq  = ch->th_seq_num;
 689
 690         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 691
 692         kfree(header);
 693
 694         dev->trans_start = jiffies;
 695         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 696
 697         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 698
 699         return;
 700
 701 done:
 702         if (rc != 0) {
 703                 grp->in_sweep = 0;
 704                 ctcm_clear_busy_do(dev);
 705                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 706         }
 707
 708         return;
 709 }
 710
 711 /*
 712  * helper function of ctcmpc_unpack_skb
 713  */
 714 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 715 {
 716         struct channel    *rch     = mpcginfo->ch;
 717         struct net_device *dev     = rch->netdev;
 718         struct ctcm_priv  *priv = dev->ml_priv;
 719         struct mpc_group  *grp  = priv->mpcg;
 720         struct channel    *ch      = priv->channel[WRITE];
 721
 722         if (do_debug)
 723                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 724                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 725
 726         if (grp->in_sweep == 0) {
 727                 grp->in_sweep = 1;
 728                 ctcm_test_and_set_busy(dev);
 729                 grp->sweep_req_pend_num = grp->active_channels[READ];
 730                 grp->sweep_rsp_pend_num = grp->active_channels[READ];
 731         }
 732
 733         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 734
 735         grp->sweep_req_pend_num--;
 736         ctcmpc_send_sweep_resp(ch);
 737         kfree(mpcginfo);
 738         return;
 739 }
 740
 741 /*
 742   * MPC Group Station FSM definitions
 743  */
 744 static const char *mpcg_event_names[] = {
 745         [MPCG_EVENT_INOP]       = "INOP Condition",
 746         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 747         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 748         [MPCG_EVENT_XID2]       = "XID2 Received",
 749         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 750         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 751         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 752         [MPCG_EVENT_DOIO]       = "XID DoIO",
 753 };
 754
 755 static const char *mpcg_state_names[] = {
 756         [MPCG_STATE_RESET]      = "Reset",
 757         [MPCG_STATE_INOP]       = "INOP",
 758         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 759         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 760         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 761         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 762         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 763         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 764         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 765         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 766         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 767         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 768         [MPCG_STATE_READY]      = "READY",
 769 };
 770
 771 /*
 772  * The MPC Group Station FSM
 773  *   22 events
 774  */
 775 static const fsm_node mpcg_fsm[] = {
 776         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 777         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 778         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 779
 780         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 781         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 782
 783         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 784         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 785         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 786         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 787         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 788
 789         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 790         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 791         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 792         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 793         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 794
 795         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 796         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 797         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 798         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 799         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 800         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 801         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 802
 803         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 804         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 805         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 806         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 807         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 808         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 809
 810         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 811         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 812         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 813         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 814         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 815         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 816
 817         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 818         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 819         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 820         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 821         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 822         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 823
 824         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 825         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 826         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 827         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 828         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 829         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 830         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 831
 832         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 833         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 834         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 835         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 836         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 837         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 838
 839         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 840         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 841 };
 842
 843 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 844
 845 /*
 846  * MPC Group Station FSM action
 847  * CTCM_PROTO_MPC only
 848  */
 849 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 850 {
 851         struct net_device *dev = arg;
 852         struct ctcm_priv *priv = dev->ml_priv;
 853         struct mpc_group *grp = priv->mpcg;
 854
 855         if (grp == NULL) {
 856                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 857                         "%s(%s): No MPC group",
 858                                 CTCM_FUNTAIL, dev->name);
 859                 return;
 860         }
 861
 862         fsm_deltimer(&grp->timer);
 863
 864         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 865                 priv->xid->xid2_flag2 = 0x00;
 866                 if (grp->estconnfunc) {
 867                         grp->estconnfunc(grp->port_num, 1,
 868                                         grp->group_max_buflen);
 869                         grp->estconnfunc = NULL;
 870                 } else if (grp->allochanfunc)
 871                         grp->send_qllc_disc = 1;
 872
 873                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 874                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 875                                 "%s(%s): fails",
 876                                         CTCM_FUNTAIL, dev->name);
 877                 return;
 878         }
 879
 880         grp->port_persist = 1;
 881         grp->out_of_sequence = 0;
 882         grp->estconn_called = 0;
 883
 884         tasklet_hi_schedule(&grp->mpc_tasklet2);
 885
 886         return;
 887 }
 888
 889 /*
 890  * helper of ctcm_init_netdevice
 891  * CTCM_PROTO_MPC only
 892  */
 893 void mpc_group_ready(unsigned long adev)
 894 {
 895         struct net_device *dev = (struct net_device *)adev;
 896         struct ctcm_priv *priv = dev->ml_priv;
 897         struct mpc_group *grp = priv->mpcg;
 898         struct channel *ch = NULL;
 899
 900         if (grp == NULL) {
 901                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 902                         "%s(%s): No MPC group",
 903                                 CTCM_FUNTAIL, dev->name);
 904                 return;
 905         }
 906
 907         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 908                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 909                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 910
 911         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 912
 913         /* Put up a read on the channel */
 914         ch = priv->channel[READ];
 915         ch->pdu_seq = 0;
 916         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 917                         __func__, ch->pdu_seq);
 918
 919         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 920         /* Put the write channel in idle state */
 921         ch = priv->channel[WRITE];
 922         if (ch->collect_len > 0) {
 923                 spin_lock(&ch->collect_lock);
 924                 ctcm_purge_skb_queue(&ch->collect_queue);
 925                 ch->collect_len = 0;
 926                 spin_unlock(&ch->collect_lock);
 927         }
 928         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 929         ctcm_clear_busy(dev);
 930
 931         if (grp->estconnfunc) {
 932                 grp->estconnfunc(grp->port_num, 0,
 933                                     grp->group_max_buflen);
 934                 grp->estconnfunc = NULL;
 935         } else  if (grp->allochanfunc)
 936                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 937
 938         grp->send_qllc_disc = 1;
 939         grp->changed_side = 0;
 940
 941         return;
 942
 943 }
 944
 945 /*
 946  * Increment the MPC Group Active Channel Counts
 947  * helper of dev_action (called from channel fsm)
 948  */
 949 void mpc_channel_action(struct channel *ch, int direction, int action)
 950 {
 951         struct net_device  *dev  = ch->netdev;
 952         struct ctcm_priv   *priv = dev->ml_priv;
 953         struct mpc_group   *grp  = priv->mpcg;
 954
 955         if (grp == NULL) {
 956                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 957                         "%s(%s): No MPC group",
 958                                 CTCM_FUNTAIL, dev->name);
 959                 return;
 960         }
 961
 962         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 963
 964         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 965                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 966                 "read=%i, write=%i\n", __func__, action,
 967                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 968                 grp->active_channels[READ], grp->active_channels[WRITE]);
 969
 970         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 971                 grp->num_channel_paths++;
 972                 grp->active_channels[direction]++;
 973                 grp->outstanding_xid2++;
 974                 ch->in_mpcgroup = 1;
 975
 976                 if (ch->xid_skb != NULL)
 977                         dev_kfree_skb_any(ch->xid_skb);
 978
 979                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 980                                         GFP_ATOMIC | GFP_DMA);
 981                 if (ch->xid_skb == NULL) {
 982                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 983                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 984                                 CTCM_FUNTAIL, dev->name);
 985                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 986                         return;
 987                 }
 988                 ch->xid_skb_data = ch->xid_skb->data;
 989                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 990                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 991                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 992                 skb_put(ch->xid_skb, XID2_LENGTH);
 993                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 994                 ch->xid_skb->data = ch->xid_skb_data;
 995                 skb_reset_tail_pointer(ch->xid_skb);
 996                 ch->xid_skb->len = 0;
 997
 998                 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
 999                                 grp->xid_skb->data,
1000                                 grp->xid_skb->len);
1001
1002                 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ)
1003                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
1004
1005                 if (CHANNEL_DIRECTION(ch->flags) == WRITE)
1006                         ch->xid->xid2_buf_len = 0x00;
1007
1008                 ch->xid_skb->data = ch->xid_skb_data;
1009                 skb_reset_tail_pointer(ch->xid_skb);
1010                 ch->xid_skb->len = 0;
1011
1012                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
1013
1014                 if ((grp->active_channels[READ]  > 0) &&
1015                     (grp->active_channels[WRITE] > 0) &&
1016                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
1017                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1018                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1019                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1020                                                 __func__, dev->name);
1021                 }
1022         } else if ((action == MPC_CHANNEL_REMOVE) &&
1023                         (ch->in_mpcgroup == 1)) {
1024                 ch->in_mpcgroup = 0;
1025                 grp->num_channel_paths--;
1026                 grp->active_channels[direction]--;
1027
1028                 if (ch->xid_skb != NULL)
1029                         dev_kfree_skb_any(ch->xid_skb);
1030                 ch->xid_skb = NULL;
1031
1032                 if (grp->channels_terminating)
1033                                         goto done;
1034
1035                 if (((grp->active_channels[READ] == 0) &&
1036                                         (grp->active_channels[WRITE] > 0))
1037                         || ((grp->active_channels[WRITE] == 0) &&
1038                                         (grp->active_channels[READ] > 0)))
1039                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1040         }
1041 done:
1042         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1043                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1044                 "read=%i, write=%i\n", __func__, action,
1045                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1046                 grp->active_channels[READ], grp->active_channels[WRITE]);
1047
1048         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1049 }
1050
1051 /**
1052  * Unpack a just received skb and hand it over to
1053  * upper layers.
1054  * special MPC version of unpack_skb.
1055  *
1056  * ch           The channel where this skb has been received.
1057  * pskb         The received skb.
1058  */
1059 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1060 {
1061         struct net_device *dev  = ch->netdev;
1062         struct ctcm_priv *priv = dev->ml_priv;
1063         struct mpc_group *grp = priv->mpcg;
1064         struct pdu *curr_pdu;
1065         struct mpcg_info *mpcginfo;
1066         struct th_header *header = NULL;
1067         struct th_sweep *sweep = NULL;
1068         int pdu_last_seen = 0;
1069         __u32 new_len;
1070         struct sk_buff *skb;
1071         int skblen;
1072         int sendrc = 0;
1073
1074         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1075                         __func__, dev->name, smp_processor_id(), ch->id);
1076
1077         header = (struct th_header *)pskb->data;
1078         if ((header->th_seg == 0) &&
1079                 (header->th_ch_flag == 0) &&
1080                 (header->th_blk_flag == 0) &&
1081                 (header->th_seq_num == 0))
1082                 /* nothing for us */    goto done;
1083
1084         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1085         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1086         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1087
1088         pskb->dev = dev;
1089         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1090         skb_pull(pskb, TH_HEADER_LENGTH);
1091
1092         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1093                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1094                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1095                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1096                     (header->th_seq_num != ch->th_seq_num + 1) &&
1097                     (ch->th_seq_num != 0))) {
1098                         /* This is NOT the next segment         *
1099                          * we are not the correct race winner   *
1100                          * go away and let someone else win     *
1101                          * BUT..this only applies if xid negot  *
1102                          * is done                              *
1103                         */
1104                         grp->out_of_sequence += 1;
1105                         __skb_push(pskb, TH_HEADER_LENGTH);
1106                         skb_queue_tail(&ch->io_queue, pskb);
1107                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1108                                         "got:%08x\n", __func__,
1109                                 ch->th_seq_num + 1, header->th_seq_num);
1110
1111                         return;
1112                 }
1113                 grp->out_of_sequence = 0;
1114                 ch->th_seq_num = header->th_seq_num;
1115
1116                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1117                                         __func__, ch->th_seq_num);
1118
1119                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1120                                         goto done;
1121                 pdu_last_seen = 0;
1122                 while ((pskb->len > 0) && !pdu_last_seen) {
1123                         curr_pdu = (struct pdu *)pskb->data;
1124
1125                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1126                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1127                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1128                                                 __func__, pskb->len);
1129
1130                         skb_pull(pskb, PDU_HEADER_LENGTH);
1131
1132                         if (curr_pdu->pdu_flag & PDU_LAST)
1133                                 pdu_last_seen = 1;
1134                         if (curr_pdu->pdu_flag & PDU_CNTL)
1135                                 pskb->protocol = htons(ETH_P_SNAP);
1136                         else
1137                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1138
1139                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1140                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1141                                         "%s(%s): Dropping packet with "
1142                                         "illegal siize %d",
1143                                         CTCM_FUNTAIL, dev->name, pskb->len);
1144
1145                                 priv->stats.rx_dropped++;
1146                                 priv->stats.rx_length_errors++;
1147                                         goto done;
1148                         }
1149                         skb_reset_mac_header(pskb);
1150                         new_len = curr_pdu->pdu_offset;
1151                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1152                                                 __func__, new_len);
1153                         if ((new_len == 0) || (new_len > pskb->len)) {
1154                                 /* should never happen              */
1155                                 /* pskb len must be hosed...bail out */
1156                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1157                                         "%s(%s): non valid pdu_offset: %04x",
1158                                         /* "data may be lost", */
1159                                         CTCM_FUNTAIL, dev->name, new_len);
1160                                 goto done;
1161                         }
1162                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1163
1164                         if (!skb) {
1165                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1166                                         "%s(%s): MEMORY allocation error",
1167                                                 CTCM_FUNTAIL, dev->name);
1168                                 priv->stats.rx_dropped++;
1169                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1170                                                 goto done;
1171                         }
1172                         memcpy(skb_put(skb, new_len), pskb->data, new_len);
1173
1174                         skb_reset_mac_header(skb);
1175                         skb->dev = pskb->dev;
1176                         skb->protocol = pskb->protocol;
1177                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1178                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1179                         ch->pdu_seq++;
1180
1181                         if (do_debug_data) {
1182                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1183                                                 __func__, ch->pdu_seq);
1184                                 ctcm_pr_debug("%s: skb:%0lx "
1185                                         "skb len: %d \n", __func__,
1186                                         (unsigned long)skb, skb->len);
1187                                 ctcm_pr_debug("%s: up to 32 bytes "
1188                                         "of pdu_data sent\n", __func__);
1189                                 ctcmpc_dump32((char *)skb->data, skb->len);
1190                         }
1191
1192                         skblen = skb->len;
1193                         sendrc = netif_rx(skb);
1194                         priv->stats.rx_packets++;
1195                         priv->stats.rx_bytes += skblen;
1196                         skb_pull(pskb, new_len); /* point to next PDU */
1197                 }
1198         } else {
1199                 mpcginfo = (struct mpcg_info *)
1200                                 kmalloc(sizeof(struct mpcg_info), gfp_type());
1201                 if (mpcginfo == NULL)
1202                                         goto done;
1203
1204                 mpcginfo->ch = ch;
1205                 mpcginfo->th = header;
1206                 mpcginfo->skb = pskb;
1207                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1208                                         __func__);
1209                 /*  it's a sweep?   */
1210                 sweep = (struct th_sweep *)pskb->data;
1211                 mpcginfo->sweep = sweep;
1212                 if (header->th_ch_flag == TH_SWEEP_REQ)
1213                         mpc_rcvd_sweep_req(mpcginfo);
1214                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1215                         mpc_rcvd_sweep_resp(mpcginfo);
1216                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1217                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1218                         skb_pull(pskb, XID2_LENGTH);
1219                         mpcginfo->xid = thisxid;
1220                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1221                 } else if (header->th_blk_flag == TH_DISCONTACT)
1222                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1223                 else if (header->th_seq_num != 0) {
1224                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1225                                 "%s(%s): control pkt expected\n",
1226                                                 CTCM_FUNTAIL, dev->name);
1227                         priv->stats.rx_dropped++;
1228                         /* mpcginfo only used for non-data transfers */
1229                         kfree(mpcginfo);
1230                         if (do_debug_data)
1231                                 ctcmpc_dump_skb(pskb, -8);
1232                 }
1233         }
1234 done:
1235
1236         dev_kfree_skb_any(pskb);
1237         if (sendrc == NET_RX_DROP) {
1238                 dev_warn(&dev->dev,
1239                         "The network backlog for %s is exceeded, "
1240                         "package dropped\n", __func__);
1241                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1242         }
1243
1244         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1245                         __func__, dev->name, ch, ch->id);
1246 }
1247
1248 /**
1249  * tasklet helper for mpc's skb unpacking.
1250  *
1251  * ch           The channel to work on.
1252  * Allow flow control back pressure to occur here.
1253  * Throttling back channel can result in excessive
1254  * channel inactivity and system deact of channel
1255  */
1256 void ctcmpc_bh(unsigned long thischan)
1257 {
1258         struct channel    *ch   = (struct channel *)thischan;
1259         struct sk_buff    *skb;
1260         struct net_device *dev  = ch->netdev;
1261         struct ctcm_priv  *priv = dev->ml_priv;
1262         struct mpc_group  *grp  = priv->mpcg;
1263
1264         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1265                dev->name, smp_processor_id(), __func__, ch->id);
1266         /* caller has requested driver to throttle back */
1267         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1268                         (skb = skb_dequeue(&ch->io_queue))) {
1269                 ctcmpc_unpack_skb(ch, skb);
1270                 if (grp->out_of_sequence > 20) {
1271                         /* assume data loss has occurred if */
1272                         /* missing seq_num for extended     */
1273                         /* period of time                   */
1274                         grp->out_of_sequence = 0;
1275                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1276                         break;
1277                 }
1278                 if (skb == skb_peek(&ch->io_queue))
1279                         break;
1280         }
1281         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1282                         __func__, dev->name, ch, ch->id);
1283         return;
1284 }
1285
1286 /*
1287  *  MPC Group Initializations
1288  */
1289 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1290 {
1291         struct mpc_group *grp;
1292
1293         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1294                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1295
1296         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1297         if (grp == NULL)
1298                 return NULL;
1299
1300         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1301                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1302                         mpcg_fsm_len, GFP_KERNEL);
1303         if (grp->fsm == NULL) {
1304                 kfree(grp);
1305                 return NULL;
1306         }
1307
1308         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1309         fsm_settimer(grp->fsm, &grp->timer);
1310
1311         grp->xid_skb =
1312                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1313         if (grp->xid_skb == NULL) {
1314                 kfree_fsm(grp->fsm);
1315                 kfree(grp);
1316                 return NULL;
1317         }
1318         /*  base xid for all channels in group  */
1319         grp->xid_skb_data = grp->xid_skb->data;
1320         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1321         memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1322                         &thnorm, TH_HEADER_LENGTH);
1323
1324         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1325         memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1326         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1327         grp->xid->xid2_sender_id = jiffies;
1328
1329         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1330         memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1331
1332         grp->rcvd_xid_skb =
1333                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1334         if (grp->rcvd_xid_skb == NULL) {
1335                 kfree_fsm(grp->fsm);
1336                 dev_kfree_skb(grp->xid_skb);
1337                 kfree(grp);
1338                 return NULL;
1339         }
1340         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1341         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1342         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1343                         &thnorm, TH_HEADER_LENGTH);
1344         grp->saved_xid2 = NULL;
1345         priv->xid = grp->xid;
1346         priv->mpcg = grp;
1347         return grp;
1348 }
1349
1350 /*
1351  * The MPC Group Station FSM
1352  */
1353
1354 /*
1355  * MPC Group Station FSM actions
1356  * CTCM_PROTO_MPC only
1357  */
1358
1359 /**
1360  * NOP action for statemachines
1361  */
1362 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1363 {
1364 }
1365
1366 /*
1367  * invoked when the device transitions to dev_stopped
1368  * MPC will stop each individual channel if a single XID failure
1369  * occurs, or will intitiate all channels be stopped if a GROUP
1370  * level failure occurs.
1371  */
1372 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1373 {
1374         struct net_device  *dev = arg;
1375         struct ctcm_priv    *priv;
1376         struct mpc_group *grp;
1377         int rc = 0;
1378         struct channel *wch, *rch;
1379
1380         BUG_ON(dev == NULL);
1381         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1382
1383         priv  = dev->ml_priv;
1384         grp =  priv->mpcg;
1385         grp->flow_off_called = 0;
1386         fsm_deltimer(&grp->timer);
1387         if (grp->channels_terminating)
1388                         return;
1389
1390         grp->channels_terminating = 1;
1391         grp->saved_state = fsm_getstate(grp->fsm);
1392         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1393         if (grp->saved_state > MPCG_STATE_XID7INITF)
1394                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1395                         "%s(%s): MPC GROUP INOPERATIVE",
1396                                 CTCM_FUNTAIL, dev->name);
1397         if ((grp->saved_state != MPCG_STATE_RESET) ||
1398                 /* dealloc_channel has been called */
1399                         ((grp->saved_state == MPCG_STATE_RESET) &&
1400                                                 (grp->port_persist == 0)))
1401                 fsm_deltimer(&priv->restart_timer);
1402
1403         wch = priv->channel[WRITE];
1404         rch = priv->channel[READ];
1405
1406         switch (grp->saved_state) {
1407         case MPCG_STATE_RESET:
1408         case MPCG_STATE_INOP:
1409         case MPCG_STATE_XID2INITW:
1410         case MPCG_STATE_XID0IOWAIT:
1411         case MPCG_STATE_XID2INITX:
1412         case MPCG_STATE_XID7INITW:
1413         case MPCG_STATE_XID7INITX:
1414         case MPCG_STATE_XID0IOWAIX:
1415         case MPCG_STATE_XID7INITI:
1416         case MPCG_STATE_XID7INITZ:
1417         case MPCG_STATE_XID7INITF:
1418                 break;
1419         case MPCG_STATE_FLOWC:
1420         case MPCG_STATE_READY:
1421         default:
1422                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1423         }
1424
1425         grp->xid2_tgnum = 0;
1426         grp->group_max_buflen = 0;  /*min of all received */
1427         grp->outstanding_xid2 = 0;
1428         grp->outstanding_xid7 = 0;
1429         grp->outstanding_xid7_p2 = 0;
1430         grp->saved_xid2 = NULL;
1431         grp->xidnogood = 0;
1432         grp->changed_side = 0;
1433
1434         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1435         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1436         grp->rcvd_xid_skb->len = 0;
1437         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1438         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1439                TH_HEADER_LENGTH);
1440
1441         if (grp->send_qllc_disc == 1) {
1442                 grp->send_qllc_disc = 0;
1443                 rc = mpc_send_qllc_discontact(dev);
1444         }
1445
1446         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1447         /* This can result in INOP of VTAM PU due to halting of  */
1448         /* outstanding IO which causes a sense to be returned    */
1449         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1450         /* become unreachable without manual intervention        */
1451         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1452                 grp->alloc_called = 0;
1453                 fsm_deltimer(&priv->restart_timer);
1454                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1455                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1456                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1457                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1458                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1459                                         CTCM_FUNTAIL, dev->name);
1460         } else {
1461                 fsm_deltimer(&priv->restart_timer);
1462                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1463                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1464                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1465                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1466                                                 CTCM_FUNTAIL, dev->name);
1467         }
1468 }
1469
1470 /**
1471  * Handle mpc group  action timeout.
1472  * MPC Group Station FSM action
1473  * CTCM_PROTO_MPC only
1474  *
1475  * fi           An instance of an mpc_group fsm.
1476  * event        The event, just happened.
1477  * arg          Generic pointer, casted from net_device * upon call.
1478  */
1479 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1480 {
1481         struct net_device *dev = arg;
1482         struct ctcm_priv *priv;
1483         struct mpc_group *grp;
1484         struct channel *wch;
1485         struct channel *rch;
1486
1487         BUG_ON(dev == NULL);
1488
1489         priv = dev->ml_priv;
1490         grp = priv->mpcg;
1491         wch = priv->channel[WRITE];
1492         rch = priv->channel[READ];
1493
1494         switch (fsm_getstate(grp->fsm)) {
1495         case MPCG_STATE_XID2INITW:
1496                 /* Unless there is outstanding IO on the  */
1497                 /* channel just return and wait for ATTN  */
1498                 /* interrupt to begin XID negotiations    */
1499                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1500                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1501                         break;
1502         default:
1503                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1504         }
1505
1506         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1507                         "%s: dev=%s exit",
1508                         CTCM_FUNTAIL, dev->name);
1509         return;
1510 }
1511
1512 /*
1513  * MPC Group Station FSM action
1514  * CTCM_PROTO_MPC only
1515  */
1516 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1517 {
1518         struct mpcg_info   *mpcginfo   = arg;
1519         struct channel     *ch         = mpcginfo->ch;
1520         struct net_device  *dev;
1521         struct ctcm_priv   *priv;
1522         struct mpc_group   *grp;
1523
1524         if (ch) {
1525                 dev = ch->netdev;
1526                 if (dev) {
1527                         priv = dev->ml_priv;
1528                         if (priv) {
1529                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1530                                         "%s: %s: %s\n",
1531                                         CTCM_FUNTAIL, dev->name, ch->id);
1532                                 grp = priv->mpcg;
1533                                 grp->send_qllc_disc = 1;
1534                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1535                         }
1536                 }
1537         }
1538
1539         return;
1540 }
1541
1542 /*
1543  * MPC Group Station - not part of FSM
1544  * CTCM_PROTO_MPC only
1545  * called from add_channel in ctcm_main.c
1546  */
1547 void mpc_action_send_discontact(unsigned long thischan)
1548 {
1549         int rc;
1550         struct channel  *ch = (struct channel *)thischan;
1551         unsigned long   saveflags = 0;
1552
1553         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1554         rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1555                                         (unsigned long)ch, 0xff, 0);
1556         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1557
1558         if (rc != 0) {
1559                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1560         }
1561
1562         return;
1563 }
1564
1565
1566 /*
1567  * helper function of mpc FSM
1568  * CTCM_PROTO_MPC only
1569  * mpc_action_rcvd_xid7
1570 */
1571 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1572 {
1573         struct channel     *ch   = mpcginfo->ch;
1574         struct net_device  *dev  = ch->netdev;
1575         struct ctcm_priv   *priv = dev->ml_priv;
1576         struct mpc_group   *grp  = priv->mpcg;
1577         struct xid2        *xid  = mpcginfo->xid;
1578         int     rc       = 0;
1579         __u64   our_id   = 0;
1580         __u64   their_id = 0;
1581         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1582
1583         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1584
1585         if (xid == NULL) {
1586                 rc = 1;
1587                 /* XID REJECTED: xid == NULL */
1588                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1589                         "%s(%s): xid = NULL",
1590                                 CTCM_FUNTAIL, ch->id);
1591                         goto done;
1592         }
1593
1594         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1595
1596         /*the received direction should be the opposite of ours  */
1597         if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE :
1598                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1599                 rc = 2;
1600                 /* XID REJECTED: r/w channel pairing mismatch */
1601                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1602                         "%s(%s): r/w channel pairing mismatch",
1603                                 CTCM_FUNTAIL, ch->id);
1604                         goto done;
1605         }
1606
1607         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1608                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1609                                 grp->group_max_buflen, xid->xid2_buf_len);
1610
1611                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1612                                                 xid->xid2_buf_len - len)
1613                         grp->group_max_buflen = xid->xid2_buf_len - len;
1614         }
1615
1616         if (grp->saved_xid2 == NULL) {
1617                 grp->saved_xid2 =
1618                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1619
1620                 memcpy(skb_put(grp->rcvd_xid_skb,
1621                                         XID2_LENGTH), xid, XID2_LENGTH);
1622                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1623
1624                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1625                 grp->rcvd_xid_skb->len = 0;
1626
1627                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1628                 our_id = (__u64)priv->xid->xid2_adj_id;
1629                 our_id = our_id << 32;
1630                 our_id = our_id + priv->xid->xid2_sender_id;
1631                 their_id = (__u64)xid->xid2_adj_id;
1632                 their_id = their_id << 32;
1633                 their_id = their_id + xid->xid2_sender_id;
1634                 /* lower id assume the xside role */
1635                 if (our_id < their_id) {
1636                         grp->roll = XSIDE;
1637                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1638                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1639                                         CTCM_FUNTAIL, ch->id);
1640                 } else {
1641                         grp->roll = YSIDE;
1642                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1643                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1644                                         CTCM_FUNTAIL, ch->id);
1645                 }
1646
1647         } else {
1648                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1649                         rc = 3;
1650                         /* XID REJECTED: xid flag byte4 mismatch */
1651                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1652                                 "%s(%s): xid flag byte4 mismatch",
1653                                         CTCM_FUNTAIL, ch->id);
1654                 }
1655                 if (xid->xid2_flag2 == 0x40) {
1656                         rc = 4;
1657                         /* XID REJECTED - xid NOGOOD */
1658                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1659                                 "%s(%s): xid NOGOOD",
1660                                         CTCM_FUNTAIL, ch->id);
1661                 }
1662                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1663                         rc = 5;
1664                         /* XID REJECTED - Adjacent Station ID Mismatch */
1665                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1666                                 "%s(%s): Adjacent Station ID Mismatch",
1667                                         CTCM_FUNTAIL, ch->id);
1668                 }
1669                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1670                         rc = 6;
1671                         /* XID REJECTED - Sender Address Mismatch */
1672                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1673                                 "%s(%s): Sender Address Mismatch",
1674                                         CTCM_FUNTAIL, ch->id);
1675                 }
1676         }
1677 done:
1678         if (rc) {
1679                 dev_warn(&dev->dev,
1680                         "The XID used in the MPC protocol is not valid, "
1681                         "rc = %d\n", rc);
1682                 priv->xid->xid2_flag2 = 0x40;
1683                 grp->saved_xid2->xid2_flag2 = 0x40;
1684         }
1685
1686         return rc;
1687 }
1688
1689 /*
1690  * MPC Group Station FSM action
1691  * CTCM_PROTO_MPC only
1692  */
1693 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1694 {
1695         struct channel *ch = arg;
1696         int rc = 0;
1697         int gotlock = 0;
1698         unsigned long saveflags = 0;    /* avoids compiler warning with
1699                                            spin_unlock_irqrestore */
1700
1701         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1702                         __func__, smp_processor_id(), ch, ch->id);
1703
1704         if (ctcm_checkalloc_buffer(ch))
1705                                         goto done;
1706
1707         /*
1708          * skb data-buffer referencing:
1709          */
1710         ch->trans_skb->data = ch->trans_skb_data;
1711         skb_reset_tail_pointer(ch->trans_skb);
1712         ch->trans_skb->len = 0;
1713         /* result of the previous 3 statements is NOT always
1714          * already set after ctcm_checkalloc_buffer
1715          * because of possible reuse of the trans_skb
1716          */
1717         memset(ch->trans_skb->data, 0, 16);
1718         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1719         /* check is main purpose here: */
1720         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1721         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1722         /* check is main purpose here: */
1723         skb_put(ch->trans_skb, XID2_LENGTH);
1724         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1725         /* cleanup back to startpoint */
1726         ch->trans_skb->data = ch->trans_skb_data;
1727         skb_reset_tail_pointer(ch->trans_skb);
1728         ch->trans_skb->len = 0;
1729
1730         /* non-checking rewrite of above skb data-buffer referencing: */
1731         /*
1732         memset(ch->trans_skb->data, 0, 16);
1733         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1734         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1735         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1736          */
1737
1738         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1739         ch->ccw[8].count        = 0;
1740         ch->ccw[8].cda          = 0x00;
1741
1742         if (!(ch->xid_th && ch->xid && ch->xid_id))
1743                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1744                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1745                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1746
1747         if (side == XSIDE) {
1748                 /* mpc_action_xside_xid */
1749                 if (ch->xid_th == NULL)
1750                                 goto done;
1751                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1752                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1753                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1754                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1755
1756                 if (ch->xid == NULL)
1757                                 goto done;
1758                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1759                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1760                 ch->ccw[10].count       = XID2_LENGTH;
1761                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1762
1763                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1764                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1765                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1766                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1767
1768                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1769                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1770                 ch->ccw[12].count       = XID2_LENGTH;
1771                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1772
1773                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1774                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1775
1776         } else { /* side == YSIDE : mpc_action_yside_xid */
1777                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1778                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1779                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1780                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1781
1782                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1783                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1784                 ch->ccw[10].count       = XID2_LENGTH;
1785                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1786
1787                 if (ch->xid_th == NULL)
1788                                 goto done;
1789                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1790                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1791                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1792                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1793
1794                 if (ch->xid == NULL)
1795                                 goto done;
1796                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1797                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1798                 ch->ccw[12].count       = XID2_LENGTH;
1799                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1800
1801                 if (ch->xid_id == NULL)
1802                                 goto done;
1803                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1804                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1805
1806         }
1807         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1808         ch->ccw[13].count       = 4;
1809
1810         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1811         ch->ccw[14].flags       = CCW_FLAG_SLI;
1812         ch->ccw[14].count       = 0;
1813         ch->ccw[14].cda         = 0;
1814
1815         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1816         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1817         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1818         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1819
1820         if (!in_irq()) {
1821                          /* Such conditional locking is a known problem for
1822                           * sparse because its static undeterministic.
1823                           * Warnings should be ignored here. */
1824                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1825                 gotlock = 1;
1826         }
1827
1828         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1829         rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1830                                 (unsigned long)ch, 0xff, 0);
1831
1832         if (gotlock)    /* see remark above about conditional locking */
1833                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1834
1835         if (rc != 0) {
1836                 ctcm_ccw_check_rc(ch, rc,
1837                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1838         }
1839
1840 done:
1841         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1842                                 __func__, ch, ch->id);
1843         return;
1844
1845 }
1846
1847 /*
1848  * MPC Group Station FSM action
1849  * CTCM_PROTO_MPC only
1850  */
1851 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1852 {
1853         mpc_action_side_xid(fsm, arg, XSIDE);
1854 }
1855
1856 /*
1857  * MPC Group Station FSM action
1858  * CTCM_PROTO_MPC only
1859  */
1860 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1861 {
1862         mpc_action_side_xid(fsm, arg, YSIDE);
1863 }
1864
1865 /*
1866  * MPC Group Station FSM action
1867  * CTCM_PROTO_MPC only
1868  */
1869 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1870 {
1871         struct channel     *ch   = arg;
1872         struct net_device  *dev  = ch->netdev;
1873         struct ctcm_priv   *priv = dev->ml_priv;
1874         struct mpc_group   *grp  = priv->mpcg;
1875
1876         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1877                         __func__, smp_processor_id(), ch, ch->id);
1878
1879         if (ch->xid == NULL) {
1880                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1881                         "%s(%s): ch->xid == NULL",
1882                                 CTCM_FUNTAIL, dev->name);
1883                 return;
1884         }
1885
1886         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1887
1888         ch->xid->xid2_option =  XID2_0;
1889
1890         switch (fsm_getstate(grp->fsm)) {
1891         case MPCG_STATE_XID2INITW:
1892         case MPCG_STATE_XID2INITX:
1893                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1894                 break;
1895         case MPCG_STATE_XID0IOWAIT:
1896         case MPCG_STATE_XID0IOWAIX:
1897                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1898                 break;
1899         }
1900
1901         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1902
1903         return;
1904 }
1905
1906 /*
1907  * MPC Group Station FSM action
1908  * CTCM_PROTO_MPC only
1909 */
1910 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1911 {
1912         struct net_device *dev = arg;
1913         struct ctcm_priv  *priv = dev->ml_priv;
1914         struct mpc_group  *grp  = NULL;
1915         int direction;
1916         int send = 0;
1917
1918         if (priv)
1919                 grp = priv->mpcg;
1920         if (grp == NULL) {
1921                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1922                 return;
1923         }
1924
1925         for (direction = READ; direction <= WRITE; direction++) {
1926                 struct channel *ch = priv->channel[direction];
1927                 struct xid2 *thisxid = ch->xid;
1928                 ch->xid_skb->data = ch->xid_skb_data;
1929                 skb_reset_tail_pointer(ch->xid_skb);
1930                 ch->xid_skb->len = 0;
1931                 thisxid->xid2_option = XID2_7;
1932                 send = 0;
1933
1934                 /* xid7 phase 1 */
1935                 if (grp->outstanding_xid7_p2 > 0) {
1936                         if (grp->roll == YSIDE) {
1937                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1938                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1939                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1940                                         memcpy(skb_put(ch->xid_skb,
1941                                                         TH_HEADER_LENGTH),
1942                                                &thdummy, TH_HEADER_LENGTH);
1943                                         send = 1;
1944                                 }
1945                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1946                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1947                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1948                                         memcpy(skb_put(ch->xid_skb,
1949                                                        TH_HEADER_LENGTH),
1950                                                &thnorm, TH_HEADER_LENGTH);
1951                                         send = 1;
1952                         }
1953                 } else {
1954                         /* xid7 phase 2 */
1955                         if (grp->roll == YSIDE) {
1956                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1957                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1958                                         memcpy(skb_put(ch->xid_skb,
1959                                                        TH_HEADER_LENGTH),
1960                                                &thnorm, TH_HEADER_LENGTH);
1961                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1962                                         send = 1;
1963                                 }
1964                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1965                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1966                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1967                                 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1968                                                 &thdummy, TH_HEADER_LENGTH);
1969                                 send = 1;
1970                         }
1971                 }
1972
1973                 if (send)
1974                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1975         }
1976
1977         return;
1978 }
1979
1980 /*
1981  * MPC Group Station FSM action
1982  * CTCM_PROTO_MPC only
1983  */
1984 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1985 {
1986
1987         struct mpcg_info   *mpcginfo  = arg;
1988         struct channel     *ch   = mpcginfo->ch;
1989         struct net_device  *dev  = ch->netdev;
1990         struct ctcm_priv   *priv = dev->ml_priv;
1991         struct mpc_group   *grp  = priv->mpcg;
1992
1993         CTCM_PR_DEBUG("%s: ch-id:%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
1997         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1998                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1999
2000         grp->outstanding_xid2--;
2001         grp->outstanding_xid7++;
2002         grp->outstanding_xid7_p2++;
2003
2004         /* must change state before validating xid to */
2005         /* properly handle interim interrupts received*/
2006         switch (fsm_getstate(grp->fsm)) {
2007         case MPCG_STATE_XID2INITW:
2008                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
2009                 mpc_validate_xid(mpcginfo);
2010                 break;
2011         case MPCG_STATE_XID0IOWAIT:
2012                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
2013                 mpc_validate_xid(mpcginfo);
2014                 break;
2015         case MPCG_STATE_XID2INITX:
2016                 if (grp->outstanding_xid2 == 0) {
2017                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
2018                         mpc_validate_xid(mpcginfo);
2019                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2020                 }
2021                 break;
2022         case MPCG_STATE_XID0IOWAIX:
2023                 if (grp->outstanding_xid2 == 0) {
2024                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
2025                         mpc_validate_xid(mpcginfo);
2026                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2027                 }
2028                 break;
2029         }
2030         kfree(mpcginfo);
2031
2032         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2033                 __func__, ch->id, grp->outstanding_xid2,
2034                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2035         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2036                 __func__, ch->id,
2037                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2038         return;
2039
2040 }
2041
2042
2043 /*
2044  * MPC Group Station FSM action
2045  * CTCM_PROTO_MPC only
2046  */
2047 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2048 {
2049         struct mpcg_info   *mpcginfo   = arg;
2050         struct channel     *ch         = mpcginfo->ch;
2051         struct net_device  *dev        = ch->netdev;
2052         struct ctcm_priv   *priv    = dev->ml_priv;
2053         struct mpc_group   *grp     = priv->mpcg;
2054
2055         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2056                 __func__, smp_processor_id(), ch, ch->id);
2057         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2058                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2059
2060         grp->outstanding_xid7--;
2061         ch->xid_skb->data = ch->xid_skb_data;
2062         skb_reset_tail_pointer(ch->xid_skb);
2063         ch->xid_skb->len = 0;
2064
2065         switch (fsm_getstate(grp->fsm)) {
2066         case MPCG_STATE_XID7INITI:
2067                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2068                 mpc_validate_xid(mpcginfo);
2069                 break;
2070         case MPCG_STATE_XID7INITW:
2071                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2072                 mpc_validate_xid(mpcginfo);
2073                 break;
2074         case MPCG_STATE_XID7INITZ:
2075         case MPCG_STATE_XID7INITX:
2076                 if (grp->outstanding_xid7 == 0) {
2077                         if (grp->outstanding_xid7_p2 > 0) {
2078                                 grp->outstanding_xid7 =
2079                                         grp->outstanding_xid7_p2;
2080                                 grp->outstanding_xid7_p2 = 0;
2081                         } else
2082                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2083
2084                         mpc_validate_xid(mpcginfo);
2085                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2086                         break;
2087                 }
2088                 mpc_validate_xid(mpcginfo);
2089                 break;
2090         }
2091         kfree(mpcginfo);
2092         return;
2093 }
2094
2095 /*
2096  * mpc_action helper of an MPC Group Station FSM action
2097  * CTCM_PROTO_MPC only
2098  */
2099 static int mpc_send_qllc_discontact(struct net_device *dev)
2100 {
2101         __u32   new_len = 0;
2102         struct sk_buff   *skb;
2103         struct qllc      *qllcptr;
2104         struct ctcm_priv *priv = dev->ml_priv;
2105         struct mpc_group *grp = priv->mpcg;
2106
2107         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2108                 __func__, mpcg_state_names[grp->saved_state]);
2109
2110         switch (grp->saved_state) {
2111         /*
2112          * establish conn callback function is
2113          * preferred method to report failure
2114          */
2115         case MPCG_STATE_XID0IOWAIT:
2116         case MPCG_STATE_XID0IOWAIX:
2117         case MPCG_STATE_XID7INITI:
2118         case MPCG_STATE_XID7INITZ:
2119         case MPCG_STATE_XID2INITW:
2120         case MPCG_STATE_XID2INITX:
2121         case MPCG_STATE_XID7INITW:
2122         case MPCG_STATE_XID7INITX:
2123                 if (grp->estconnfunc) {
2124                         grp->estconnfunc(grp->port_num, -1, 0);
2125                         grp->estconnfunc = NULL;
2126                         break;
2127                 }
2128         case MPCG_STATE_FLOWC:
2129         case MPCG_STATE_READY:
2130                 grp->send_qllc_disc = 2;
2131                 new_len = sizeof(struct qllc);
2132                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2133                 if (qllcptr == NULL) {
2134                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2135                                 "%s(%s): qllcptr allocation error",
2136                                                 CTCM_FUNTAIL, dev->name);
2137                         return -ENOMEM;
2138                 }
2139
2140                 qllcptr->qllc_address = 0xcc;
2141                 qllcptr->qllc_commands = 0x03;
2142
2143                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2144
2145                 if (skb == NULL) {
2146                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2147                                 "%s(%s): skb allocation error",
2148                                                 CTCM_FUNTAIL, dev->name);
2149                         priv->stats.rx_dropped++;
2150                         kfree(qllcptr);
2151                         return -ENOMEM;
2152                 }
2153
2154                 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2155                 kfree(qllcptr);
2156
2157                 if (skb_headroom(skb) < 4) {
2158                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2159                                 "%s(%s): skb_headroom error",
2160                                                 CTCM_FUNTAIL, dev->name);
2161                         dev_kfree_skb_any(skb);
2162                         return -ENOMEM;
2163                 }
2164
2165                 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq;
2166                 priv->channel[READ]->pdu_seq++;
2167                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2168                                 __func__, priv->channel[READ]->pdu_seq);
2169
2170                 /* receipt of CC03 resets anticipated sequence number on
2171                       receiving side */
2172                 priv->channel[READ]->pdu_seq = 0x00;
2173                 skb_reset_mac_header(skb);
2174                 skb->dev = dev;
2175                 skb->protocol = htons(ETH_P_SNAP);
2176                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2177
2178                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2179
2180                 netif_rx(skb);
2181                 break;
2182         default:
2183                 break;
2184
2185         }
2186
2187         return 0;
2188 }
2189 /* --- This is the END my friend --- */
2190