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                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 397                         grp->allocchan_callback_retries = 0;
 398                 }
 399                 break;
 400         }
 401
 402         return 0;
 403 }
 404 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 405
 406 /*
 407  * ctc_mpc_establish_connectivity
 408  *      (exported interface)
 409  */
 410 void ctc_mpc_establish_connectivity(int port_num,
 411                                 void (*callback)(int, int, int))
 412 {
 413         struct net_device *dev;
 414         struct mpc_group *grp;
 415         struct ctcm_priv *priv;
 416         struct channel *rch, *wch;
 417
 418         dev = ctcmpc_get_dev(port_num);
 419         if (dev == NULL)
 420                 return;
 421         priv = dev->ml_priv;
 422         grp = priv->mpcg;
 423         rch = priv->channel[READ];
 424         wch = priv->channel[WRITE];
 425
 426         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 427                         "%s(%s): state=%s",
 428                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 429
 430         grp->estconnfunc = callback;
 431         grp->port_num = port_num;
 432
 433         switch (fsm_getstate(grp->fsm)) {
 434         case MPCG_STATE_READY:
 435                 /* XID exchanges completed after PORT was activated */
 436                 /* Link station already active                      */
 437                 /* Maybe timing issue...retry callback              */
 438                 fsm_deltimer(&grp->timer);
 439                 grp->estconn_callback_retries++;
 440                 if (grp->estconn_callback_retries < 4) {
 441                         if (grp->estconnfunc) {
 442                                 grp->estconnfunc(grp->port_num, 0,
 443                                                 grp->group_max_buflen);
 444                                 grp->estconnfunc = NULL;
 445                         }
 446                 } else {
 447                         /* there are problems...bail out         */
 448                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 449                         grp->estconn_callback_retries = 0;
 450                 }
 451                 break;
 452         case MPCG_STATE_INOP:
 453         case MPCG_STATE_RESET:
 454                 /* MPC Group is not ready to start XID - min num of */
 455                 /* 1 read and 1 write channel have not been acquired*/
 456
 457                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 458                         "%s(%s): REJECTED - inactive channels",
 459                                         CTCM_FUNTAIL, dev->name);
 460                 if (grp->estconnfunc) {
 461                         grp->estconnfunc(grp->port_num, -1, 0);
 462                         grp->estconnfunc = NULL;
 463                 }
 464                 break;
 465         case MPCG_STATE_XID2INITW:
 466                 /* alloc channel was called but no XID exchange    */
 467                 /* has occurred. initiate xside XID exchange       */
 468                 /* make sure yside XID0 processing has not started */
 469
 470                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 471                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 472                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 473                                 "%s(%s): ABORT - PASSIVE XID",
 474                                         CTCM_FUNTAIL, dev->name);
 475                         break;
 476                 }
 477                 grp->send_qllc_disc = 1;
 478                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 479                 fsm_deltimer(&grp->timer);
 480                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 481                                                 MPCG_EVENT_TIMER, dev);
 482                 grp->outstanding_xid7 = 0;
 483                 grp->outstanding_xid7_p2 = 0;
 484                 grp->saved_xid2 = NULL;
 485                 if ((rch->in_mpcgroup) &&
 486                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 487                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 488                 else {
 489                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 490                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 491                                         CTCM_FUNTAIL, dev->name, rch->id);
 492                         if (grp->estconnfunc) {
 493                                 grp->estconnfunc(grp->port_num, -1, 0);
 494                                 grp->estconnfunc = NULL;
 495                         }
 496                         fsm_deltimer(&grp->timer);
 497                                 goto done;
 498                 }
 499                 if ((wch->in_mpcgroup) &&
 500                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 501                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 502                 else {
 503                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 504                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 505                                         CTCM_FUNTAIL, dev->name, wch->id);
 506                         if (grp->estconnfunc) {
 507                                 grp->estconnfunc(grp->port_num, -1, 0);
 508                                 grp->estconnfunc = NULL;
 509                         }
 510                         fsm_deltimer(&grp->timer);
 511                                 goto done;
 512                         }
 513                 break;
 514         case MPCG_STATE_XID0IOWAIT:
 515                 /* already in active XID negotiations */
 516         default:
 517                 break;
 518         }
 519
 520 done:
 521         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 522         return;
 523 }
 524 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 525
 526 /*
 527  * ctc_mpc_dealloc_ch
 528  *      (exported interface)
 529  */
 530 void ctc_mpc_dealloc_ch(int port_num)
 531 {
 532         struct net_device *dev;
 533         struct ctcm_priv *priv;
 534         struct mpc_group *grp;
 535
 536         dev = ctcmpc_get_dev(port_num);
 537         if (dev == NULL)
 538                 return;
 539         priv = dev->ml_priv;
 540         grp = priv->mpcg;
 541
 542         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 543                         "%s: %s: refcount = %d\n",
 544                         CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt));
 545
 546         fsm_deltimer(&priv->restart_timer);
 547         grp->channels_terminating = 0;
 548         fsm_deltimer(&grp->timer);
 549         grp->allochanfunc = NULL;
 550         grp->estconnfunc = NULL;
 551         grp->port_persist = 0;
 552         grp->send_qllc_disc = 0;
 553         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 554
 555         ctcm_close(dev);
 556         return;
 557 }
 558 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 559
 560 /*
 561  * ctc_mpc_flow_control
 562  *      (exported interface)
 563  */
 564 void ctc_mpc_flow_control(int port_num, int flowc)
 565 {
 566         struct ctcm_priv *priv;
 567         struct mpc_group *grp;
 568         struct net_device *dev;
 569         struct channel *rch;
 570         int mpcg_state;
 571
 572         dev = ctcmpc_get_dev(port_num);
 573         if (dev == NULL)
 574                 return;
 575         priv = dev->ml_priv;
 576         grp = priv->mpcg;
 577
 578         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 579                         "%s: %s: flowc = %d",
 580                                 CTCM_FUNTAIL, dev->name, flowc);
 581
 582         rch = priv->channel[READ];
 583
 584         mpcg_state = fsm_getstate(grp->fsm);
 585         switch (flowc) {
 586         case 1:
 587                 if (mpcg_state == MPCG_STATE_FLOWC)
 588                         break;
 589                 if (mpcg_state == MPCG_STATE_READY) {
 590                         if (grp->flow_off_called == 1)
 591                                 grp->flow_off_called = 0;
 592                         else
 593                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 594                         break;
 595                 }
 596                 break;
 597         case 0:
 598                 if (mpcg_state == MPCG_STATE_FLOWC) {
 599                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 600                         /* ensure any data that has accumulated */
 601                         /* on the io_queue will now be sen t    */
 602                         tasklet_schedule(&rch->ch_tasklet);
 603                 }
 604                 /* possible race condition                      */
 605                 if (mpcg_state == MPCG_STATE_READY) {
 606                         grp->flow_off_called = 1;
 607                         break;
 608                 }
 609                 break;
 610         }
 611
 612 }
 613 EXPORT_SYMBOL(ctc_mpc_flow_control);
 614
 615 static int mpc_send_qllc_discontact(struct net_device *);
 616
 617 /*
 618  * helper function of ctcmpc_unpack_skb
 619 */
 620 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 621 {
 622         struct channel    *rch = mpcginfo->ch;
 623         struct net_device *dev = rch->netdev;
 624         struct ctcm_priv   *priv = dev->ml_priv;
 625         struct mpc_group  *grp = priv->mpcg;
 626         struct channel    *ch = priv->channel[WRITE];
 627
 628         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 629         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 630
 631         grp->sweep_rsp_pend_num--;
 632
 633         if ((grp->sweep_req_pend_num == 0) &&
 634                         (grp->sweep_rsp_pend_num == 0)) {
 635                 fsm_deltimer(&ch->sweep_timer);
 636                 grp->in_sweep = 0;
 637                 rch->th_seq_num = 0x00;
 638                 ch->th_seq_num = 0x00;
 639                 ctcm_clear_busy_do(dev);
 640         }
 641
 642         kfree(mpcginfo);
 643
 644         return;
 645
 646 }
 647
 648 /*
 649  * helper function of mpc_rcvd_sweep_req
 650  * which is a helper of ctcmpc_unpack_skb
 651  */
 652 static void ctcmpc_send_sweep_resp(struct channel *rch)
 653 {
 654         struct net_device *dev = rch->netdev;
 655         struct ctcm_priv *priv = dev->ml_priv;
 656         struct mpc_group *grp = priv->mpcg;
 657         int rc = 0;
 658         struct th_sweep *header;
 659         struct sk_buff *sweep_skb;
 660         struct channel *ch  = priv->channel[WRITE];
 661
 662         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 663
 664         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 665         if (sweep_skb == NULL) {
 666                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 667                         "%s(%s): sweep_skb allocation ERROR\n",
 668                         CTCM_FUNTAIL, rch->id);
 669                 rc = -ENOMEM;
 670                                 goto done;
 671         }
 672
 673         header = (struct th_sweep *)
 674                         kmalloc(sizeof(struct th_sweep), gfp_type());
 675
 676         if (!header) {
 677                 dev_kfree_skb_any(sweep_skb);
 678                 rc = -ENOMEM;
 679                                 goto done;
 680         }
 681
 682         header->th.th_seg       = 0x00 ;
 683         header->th.th_ch_flag   = TH_SWEEP_RESP;
 684         header->th.th_blk_flag  = 0x00;
 685         header->th.th_is_xid    = 0x00;
 686         header->th.th_seq_num   = 0x00;
 687         header->sw.th_last_seq  = ch->th_seq_num;
 688
 689         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 690
 691         kfree(header);
 692
 693         dev->trans_start = jiffies;
 694         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 695
 696         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 697
 698         return;
 699
 700 done:
 701         grp->in_sweep = 0;
 702         ctcm_clear_busy_do(dev);
 703         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 704
 705         return;
 706 }
 707
 708 /*
 709  * helper function of ctcmpc_unpack_skb
 710  */
 711 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 712 {
 713         struct channel    *rch     = mpcginfo->ch;
 714         struct net_device *dev     = rch->netdev;
 715         struct ctcm_priv  *priv = dev->ml_priv;
 716         struct mpc_group  *grp  = priv->mpcg;
 717         struct channel    *ch      = priv->channel[WRITE];
 718
 719         if (do_debug)
 720                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 721                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 722
 723         if (grp->in_sweep == 0) {
 724                 grp->in_sweep = 1;
 725                 ctcm_test_and_set_busy(dev);
 726                 grp->sweep_req_pend_num = grp->active_channels[READ];
 727                 grp->sweep_rsp_pend_num = grp->active_channels[READ];
 728         }
 729
 730         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 731
 732         grp->sweep_req_pend_num--;
 733         ctcmpc_send_sweep_resp(ch);
 734         kfree(mpcginfo);
 735         return;
 736 }
 737
 738 /*
 739   * MPC Group Station FSM definitions
 740  */
 741 static const char *mpcg_event_names[] = {
 742         [MPCG_EVENT_INOP]       = "INOP Condition",
 743         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 744         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 745         [MPCG_EVENT_XID2]       = "XID2 Received",
 746         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 747         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 748         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 749         [MPCG_EVENT_DOIO]       = "XID DoIO",
 750 };
 751
 752 static const char *mpcg_state_names[] = {
 753         [MPCG_STATE_RESET]      = "Reset",
 754         [MPCG_STATE_INOP]       = "INOP",
 755         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 756         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 757         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 758         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 759         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 760         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 761         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 762         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 763         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 764         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 765         [MPCG_STATE_READY]      = "READY",
 766 };
 767
 768 /*
 769  * The MPC Group Station FSM
 770  *   22 events
 771  */
 772 static const fsm_node mpcg_fsm[] = {
 773         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 774         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 775         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 776
 777         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 778         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 779
 780         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 781         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 782         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 783         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 784         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 785
 786         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 787         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 788         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 789         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 790         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 791
 792         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 793         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 794         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 795         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 796         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 797         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 798         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 799
 800         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 801         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 802         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 803         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 804         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 805         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 806
 807         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 808         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 809         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 810         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 811         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 812         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 813
 814         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 815         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 816         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 817         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 818         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 819         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 820
 821         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 822         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 823         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 824         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 825         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 826         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 827         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 828
 829         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 830         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 831         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 832         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 833         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 834         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 835
 836         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 837         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 838 };
 839
 840 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 841
 842 /*
 843  * MPC Group Station FSM action
 844  * CTCM_PROTO_MPC only
 845  */
 846 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 847 {
 848         struct net_device *dev = arg;
 849         struct ctcm_priv *priv = dev->ml_priv;
 850         struct mpc_group *grp = priv->mpcg;
 851
 852         if (grp == NULL) {
 853                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 854                         "%s(%s): No MPC group",
 855                                 CTCM_FUNTAIL, dev->name);
 856                 return;
 857         }
 858
 859         fsm_deltimer(&grp->timer);
 860
 861         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 862                 priv->xid->xid2_flag2 = 0x00;
 863                 if (grp->estconnfunc) {
 864                         grp->estconnfunc(grp->port_num, 1,
 865                                         grp->group_max_buflen);
 866                         grp->estconnfunc = NULL;
 867                 } else if (grp->allochanfunc)
 868                         grp->send_qllc_disc = 1;
 869
 870                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 871                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 872                                 "%s(%s): fails",
 873                                         CTCM_FUNTAIL, dev->name);
 874                 return;
 875         }
 876
 877         grp->port_persist = 1;
 878         grp->out_of_sequence = 0;
 879         grp->estconn_called = 0;
 880
 881         tasklet_hi_schedule(&grp->mpc_tasklet2);
 882
 883         return;
 884 }
 885
 886 /*
 887  * helper of ctcm_init_netdevice
 888  * CTCM_PROTO_MPC only
 889  */
 890 void mpc_group_ready(unsigned long adev)
 891 {
 892         struct net_device *dev = (struct net_device *)adev;
 893         struct ctcm_priv *priv = dev->ml_priv;
 894         struct mpc_group *grp = priv->mpcg;
 895         struct channel *ch = NULL;
 896
 897         if (grp == NULL) {
 898                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 899                         "%s(%s): No MPC group",
 900                                 CTCM_FUNTAIL, dev->name);
 901                 return;
 902         }
 903
 904         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 905                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 906                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 907
 908         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 909
 910         /* Put up a read on the channel */
 911         ch = priv->channel[READ];
 912         ch->pdu_seq = 0;
 913         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 914                         __func__, ch->pdu_seq);
 915
 916         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 917         /* Put the write channel in idle state */
 918         ch = priv->channel[WRITE];
 919         if (ch->collect_len > 0) {
 920                 spin_lock(&ch->collect_lock);
 921                 ctcm_purge_skb_queue(&ch->collect_queue);
 922                 ch->collect_len = 0;
 923                 spin_unlock(&ch->collect_lock);
 924         }
 925         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 926         ctcm_clear_busy(dev);
 927
 928         if (grp->estconnfunc) {
 929                 grp->estconnfunc(grp->port_num, 0,
 930                                     grp->group_max_buflen);
 931                 grp->estconnfunc = NULL;
 932         } else  if (grp->allochanfunc)
 933                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 934
 935         grp->send_qllc_disc = 1;
 936         grp->changed_side = 0;
 937
 938         return;
 939
 940 }
 941
 942 /*
 943  * Increment the MPC Group Active Channel Counts
 944  * helper of dev_action (called from channel fsm)
 945  */
 946 void mpc_channel_action(struct channel *ch, int direction, int action)
 947 {
 948         struct net_device  *dev  = ch->netdev;
 949         struct ctcm_priv   *priv = dev->ml_priv;
 950         struct mpc_group   *grp  = priv->mpcg;
 951
 952         if (grp == NULL) {
 953                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 954                         "%s(%s): No MPC group",
 955                                 CTCM_FUNTAIL, dev->name);
 956                 return;
 957         }
 958
 959         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 960
 961         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 962                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 963                 "read=%i, write=%i\n", __func__, action,
 964                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 965                 grp->active_channels[READ], grp->active_channels[WRITE]);
 966
 967         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 968                 grp->num_channel_paths++;
 969                 grp->active_channels[direction]++;
 970                 grp->outstanding_xid2++;
 971                 ch->in_mpcgroup = 1;
 972
 973                 if (ch->xid_skb != NULL)
 974                         dev_kfree_skb_any(ch->xid_skb);
 975
 976                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 977                                         GFP_ATOMIC | GFP_DMA);
 978                 if (ch->xid_skb == NULL) {
 979                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 980                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 981                                 CTCM_FUNTAIL, dev->name);
 982                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 983                         return;
 984                 }
 985                 ch->xid_skb_data = ch->xid_skb->data;
 986                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 987                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 988                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 989                 skb_put(ch->xid_skb, XID2_LENGTH);
 990                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 991                 ch->xid_skb->data = ch->xid_skb_data;
 992                 skb_reset_tail_pointer(ch->xid_skb);
 993                 ch->xid_skb->len = 0;
 994
 995                 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
 996                                 grp->xid_skb->data,
 997                                 grp->xid_skb->len);
 998
 999                 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ)
1000                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
1001
1002                 if (CHANNEL_DIRECTION(ch->flags) == WRITE)
1003                         ch->xid->xid2_buf_len = 0x00;
1004
1005                 ch->xid_skb->data = ch->xid_skb_data;
1006                 skb_reset_tail_pointer(ch->xid_skb);
1007                 ch->xid_skb->len = 0;
1008
1009                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
1010
1011                 if ((grp->active_channels[READ]  > 0) &&
1012                     (grp->active_channels[WRITE] > 0) &&
1013                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
1014                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1015                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1016                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1017                                                 __func__, dev->name);
1018                 }
1019         } else if ((action == MPC_CHANNEL_REMOVE) &&
1020                         (ch->in_mpcgroup == 1)) {
1021                 ch->in_mpcgroup = 0;
1022                 grp->num_channel_paths--;
1023                 grp->active_channels[direction]--;
1024
1025                 if (ch->xid_skb != NULL)
1026                         dev_kfree_skb_any(ch->xid_skb);
1027                 ch->xid_skb = NULL;
1028
1029                 if (grp->channels_terminating)
1030                                         goto done;
1031
1032                 if (((grp->active_channels[READ] == 0) &&
1033                                         (grp->active_channels[WRITE] > 0))
1034                         || ((grp->active_channels[WRITE] == 0) &&
1035                                         (grp->active_channels[READ] > 0)))
1036                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1037         }
1038 done:
1039         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1040                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1041                 "read=%i, write=%i\n", __func__, action,
1042                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1043                 grp->active_channels[READ], grp->active_channels[WRITE]);
1044
1045         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1046 }
1047
1048 /**
1049  * Unpack a just received skb and hand it over to
1050  * upper layers.
1051  * special MPC version of unpack_skb.
1052  *
1053  * ch           The channel where this skb has been received.
1054  * pskb         The received skb.
1055  */
1056 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1057 {
1058         struct net_device *dev  = ch->netdev;
1059         struct ctcm_priv *priv = dev->ml_priv;
1060         struct mpc_group *grp = priv->mpcg;
1061         struct pdu *curr_pdu;
1062         struct mpcg_info *mpcginfo;
1063         struct th_header *header = NULL;
1064         struct th_sweep *sweep = NULL;
1065         int pdu_last_seen = 0;
1066         __u32 new_len;
1067         struct sk_buff *skb;
1068         int skblen;
1069         int sendrc = 0;
1070
1071         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1072                         __func__, dev->name, smp_processor_id(), ch->id);
1073
1074         header = (struct th_header *)pskb->data;
1075         if ((header->th_seg == 0) &&
1076                 (header->th_ch_flag == 0) &&
1077                 (header->th_blk_flag == 0) &&
1078                 (header->th_seq_num == 0))
1079                 /* nothing for us */    goto done;
1080
1081         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1082         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1083         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1084
1085         pskb->dev = dev;
1086         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1087         skb_pull(pskb, TH_HEADER_LENGTH);
1088
1089         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1090                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1091                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1092                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1093                     (header->th_seq_num != ch->th_seq_num + 1) &&
1094                     (ch->th_seq_num != 0))) {
1095                         /* This is NOT the next segment         *
1096                          * we are not the correct race winner   *
1097                          * go away and let someone else win     *
1098                          * BUT..this only applies if xid negot  *
1099                          * is done                              *
1100                         */
1101                         grp->out_of_sequence += 1;
1102                         __skb_push(pskb, TH_HEADER_LENGTH);
1103                         skb_queue_tail(&ch->io_queue, pskb);
1104                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1105                                         "got:%08x\n", __func__,
1106                                 ch->th_seq_num + 1, header->th_seq_num);
1107
1108                         return;
1109                 }
1110                 grp->out_of_sequence = 0;
1111                 ch->th_seq_num = header->th_seq_num;
1112
1113                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1114                                         __func__, ch->th_seq_num);
1115
1116                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1117                                         goto done;
1118                 while ((pskb->len > 0) && !pdu_last_seen) {
1119                         curr_pdu = (struct pdu *)pskb->data;
1120
1121                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1122                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1123                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1124                                                 __func__, pskb->len);
1125
1126                         skb_pull(pskb, PDU_HEADER_LENGTH);
1127
1128                         if (curr_pdu->pdu_flag & PDU_LAST)
1129                                 pdu_last_seen = 1;
1130                         if (curr_pdu->pdu_flag & PDU_CNTL)
1131                                 pskb->protocol = htons(ETH_P_SNAP);
1132                         else
1133                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1134
1135                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1136                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137                                         "%s(%s): Dropping packet with "
1138                                         "illegal siize %d",
1139                                         CTCM_FUNTAIL, dev->name, pskb->len);
1140
1141                                 priv->stats.rx_dropped++;
1142                                 priv->stats.rx_length_errors++;
1143                                         goto done;
1144                         }
1145                         skb_reset_mac_header(pskb);
1146                         new_len = curr_pdu->pdu_offset;
1147                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1148                                                 __func__, new_len);
1149                         if ((new_len == 0) || (new_len > pskb->len)) {
1150                                 /* should never happen              */
1151                                 /* pskb len must be hosed...bail out */
1152                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1153                                         "%s(%s): non valid pdu_offset: %04x",
1154                                         /* "data may be lost", */
1155                                         CTCM_FUNTAIL, dev->name, new_len);
1156                                 goto done;
1157                         }
1158                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1159
1160                         if (!skb) {
1161                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1162                                         "%s(%s): MEMORY allocation error",
1163                                                 CTCM_FUNTAIL, dev->name);
1164                                 priv->stats.rx_dropped++;
1165                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1166                                                 goto done;
1167                         }
1168                         memcpy(skb_put(skb, new_len), pskb->data, new_len);
1169
1170                         skb_reset_mac_header(skb);
1171                         skb->dev = pskb->dev;
1172                         skb->protocol = pskb->protocol;
1173                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1174                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1175                         ch->pdu_seq++;
1176
1177                         if (do_debug_data) {
1178                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1179                                                 __func__, ch->pdu_seq);
1180                                 ctcm_pr_debug("%s: skb:%0lx "
1181                                         "skb len: %d \n", __func__,
1182                                         (unsigned long)skb, skb->len);
1183                                 ctcm_pr_debug("%s: up to 32 bytes "
1184                                         "of pdu_data sent\n", __func__);
1185                                 ctcmpc_dump32((char *)skb->data, skb->len);
1186                         }
1187
1188                         skblen = skb->len;
1189                         sendrc = netif_rx(skb);
1190                         priv->stats.rx_packets++;
1191                         priv->stats.rx_bytes += skblen;
1192                         skb_pull(pskb, new_len); /* point to next PDU */
1193                 }
1194         } else {
1195                 mpcginfo = (struct mpcg_info *)
1196                                 kmalloc(sizeof(struct mpcg_info), gfp_type());
1197                 if (mpcginfo == NULL)
1198                                         goto done;
1199
1200                 mpcginfo->ch = ch;
1201                 mpcginfo->th = header;
1202                 mpcginfo->skb = pskb;
1203                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1204                                         __func__);
1205                 /*  it's a sweep?   */
1206                 sweep = (struct th_sweep *)pskb->data;
1207                 mpcginfo->sweep = sweep;
1208                 if (header->th_ch_flag == TH_SWEEP_REQ)
1209                         mpc_rcvd_sweep_req(mpcginfo);
1210                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1211                         mpc_rcvd_sweep_resp(mpcginfo);
1212                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1213                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1214                         skb_pull(pskb, XID2_LENGTH);
1215                         mpcginfo->xid = thisxid;
1216                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1217                 } else if (header->th_blk_flag == TH_DISCONTACT)
1218                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1219                 else if (header->th_seq_num != 0) {
1220                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1221                                 "%s(%s): control pkt expected\n",
1222                                                 CTCM_FUNTAIL, dev->name);
1223                         priv->stats.rx_dropped++;
1224                         /* mpcginfo only used for non-data transfers */
1225                         kfree(mpcginfo);
1226                         if (do_debug_data)
1227                                 ctcmpc_dump_skb(pskb, -8);
1228                 }
1229         }
1230 done:
1231
1232         dev_kfree_skb_any(pskb);
1233         if (sendrc == NET_RX_DROP) {
1234                 dev_warn(&dev->dev,
1235                         "The network backlog for %s is exceeded, "
1236                         "package dropped\n", __func__);
1237                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1238         }
1239
1240         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1241                         __func__, dev->name, ch, ch->id);
1242 }
1243
1244 /**
1245  * tasklet helper for mpc's skb unpacking.
1246  *
1247  * ch           The channel to work on.
1248  * Allow flow control back pressure to occur here.
1249  * Throttling back channel can result in excessive
1250  * channel inactivity and system deact of channel
1251  */
1252 void ctcmpc_bh(unsigned long thischan)
1253 {
1254         struct channel    *ch   = (struct channel *)thischan;
1255         struct sk_buff    *skb;
1256         struct net_device *dev  = ch->netdev;
1257         struct ctcm_priv  *priv = dev->ml_priv;
1258         struct mpc_group  *grp  = priv->mpcg;
1259
1260         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1261                dev->name, smp_processor_id(), __func__, ch->id);
1262         /* caller has requested driver to throttle back */
1263         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1264                         (skb = skb_dequeue(&ch->io_queue))) {
1265                 ctcmpc_unpack_skb(ch, skb);
1266                 if (grp->out_of_sequence > 20) {
1267                         /* assume data loss has occurred if */
1268                         /* missing seq_num for extended     */
1269                         /* period of time                   */
1270                         grp->out_of_sequence = 0;
1271                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1272                         break;
1273                 }
1274                 if (skb == skb_peek(&ch->io_queue))
1275                         break;
1276         }
1277         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1278                         __func__, dev->name, ch, ch->id);
1279         return;
1280 }
1281
1282 /*
1283  *  MPC Group Initializations
1284  */
1285 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1286 {
1287         struct mpc_group *grp;
1288
1289         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1290                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1291
1292         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1293         if (grp == NULL)
1294                 return NULL;
1295
1296         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1297                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1298                         mpcg_fsm_len, GFP_KERNEL);
1299         if (grp->fsm == NULL) {
1300                 kfree(grp);
1301                 return NULL;
1302         }
1303
1304         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1305         fsm_settimer(grp->fsm, &grp->timer);
1306
1307         grp->xid_skb =
1308                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1309         if (grp->xid_skb == NULL) {
1310                 kfree_fsm(grp->fsm);
1311                 kfree(grp);
1312                 return NULL;
1313         }
1314         /*  base xid for all channels in group  */
1315         grp->xid_skb_data = grp->xid_skb->data;
1316         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1317         memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1318                         &thnorm, TH_HEADER_LENGTH);
1319
1320         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1321         memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1322         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1323         grp->xid->xid2_sender_id = jiffies;
1324
1325         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1326         memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1327
1328         grp->rcvd_xid_skb =
1329                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1330         if (grp->rcvd_xid_skb == NULL) {
1331                 kfree_fsm(grp->fsm);
1332                 dev_kfree_skb(grp->xid_skb);
1333                 kfree(grp);
1334                 return NULL;
1335         }
1336         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1337         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1338         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1339                         &thnorm, TH_HEADER_LENGTH);
1340         grp->saved_xid2 = NULL;
1341         priv->xid = grp->xid;
1342         priv->mpcg = grp;
1343         return grp;
1344 }
1345
1346 /*
1347  * The MPC Group Station FSM
1348  */
1349
1350 /*
1351  * MPC Group Station FSM actions
1352  * CTCM_PROTO_MPC only
1353  */
1354
1355 /**
1356  * NOP action for statemachines
1357  */
1358 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1359 {
1360 }
1361
1362 /*
1363  * invoked when the device transitions to dev_stopped
1364  * MPC will stop each individual channel if a single XID failure
1365  * occurs, or will intitiate all channels be stopped if a GROUP
1366  * level failure occurs.
1367  */
1368 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1369 {
1370         struct net_device  *dev = arg;
1371         struct ctcm_priv    *priv;
1372         struct mpc_group *grp;
1373         int rc = 0;
1374         struct channel *wch, *rch;
1375
1376         BUG_ON(dev == NULL);
1377         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1378
1379         priv  = dev->ml_priv;
1380         grp =  priv->mpcg;
1381         grp->flow_off_called = 0;
1382         fsm_deltimer(&grp->timer);
1383         if (grp->channels_terminating)
1384                         return;
1385
1386         grp->channels_terminating = 1;
1387         grp->saved_state = fsm_getstate(grp->fsm);
1388         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1389         if (grp->saved_state > MPCG_STATE_XID7INITF)
1390                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1391                         "%s(%s): MPC GROUP INOPERATIVE",
1392                                 CTCM_FUNTAIL, dev->name);
1393         if ((grp->saved_state != MPCG_STATE_RESET) ||
1394                 /* dealloc_channel has been called */
1395                 (grp->port_persist == 0))
1396                 fsm_deltimer(&priv->restart_timer);
1397
1398         wch = priv->channel[WRITE];
1399         rch = priv->channel[READ];
1400
1401         switch (grp->saved_state) {
1402         case MPCG_STATE_RESET:
1403         case MPCG_STATE_INOP:
1404         case MPCG_STATE_XID2INITW:
1405         case MPCG_STATE_XID0IOWAIT:
1406         case MPCG_STATE_XID2INITX:
1407         case MPCG_STATE_XID7INITW:
1408         case MPCG_STATE_XID7INITX:
1409         case MPCG_STATE_XID0IOWAIX:
1410         case MPCG_STATE_XID7INITI:
1411         case MPCG_STATE_XID7INITZ:
1412         case MPCG_STATE_XID7INITF:
1413                 break;
1414         case MPCG_STATE_FLOWC:
1415         case MPCG_STATE_READY:
1416         default:
1417                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1418         }
1419
1420         grp->xid2_tgnum = 0;
1421         grp->group_max_buflen = 0;  /*min of all received */
1422         grp->outstanding_xid2 = 0;
1423         grp->outstanding_xid7 = 0;
1424         grp->outstanding_xid7_p2 = 0;
1425         grp->saved_xid2 = NULL;
1426         grp->xidnogood = 0;
1427         grp->changed_side = 0;
1428
1429         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1430         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1431         grp->rcvd_xid_skb->len = 0;
1432         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1433         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1434                TH_HEADER_LENGTH);
1435
1436         if (grp->send_qllc_disc == 1) {
1437                 grp->send_qllc_disc = 0;
1438                 rc = mpc_send_qllc_discontact(dev);
1439         }
1440
1441         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1442         /* This can result in INOP of VTAM PU due to halting of  */
1443         /* outstanding IO which causes a sense to be returned    */
1444         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1445         /* become unreachable without manual intervention        */
1446         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1447                 grp->alloc_called = 0;
1448                 fsm_deltimer(&priv->restart_timer);
1449                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1450                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1451                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1452                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1453                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1454                                         CTCM_FUNTAIL, dev->name);
1455         } else {
1456                 fsm_deltimer(&priv->restart_timer);
1457                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1458                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1459                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1460                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1461                                                 CTCM_FUNTAIL, dev->name);
1462         }
1463 }
1464
1465 /**
1466  * Handle mpc group  action timeout.
1467  * MPC Group Station FSM action
1468  * CTCM_PROTO_MPC only
1469  *
1470  * fi           An instance of an mpc_group fsm.
1471  * event        The event, just happened.
1472  * arg          Generic pointer, casted from net_device * upon call.
1473  */
1474 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1475 {
1476         struct net_device *dev = arg;
1477         struct ctcm_priv *priv;
1478         struct mpc_group *grp;
1479         struct channel *wch;
1480         struct channel *rch;
1481
1482         BUG_ON(dev == NULL);
1483
1484         priv = dev->ml_priv;
1485         grp = priv->mpcg;
1486         wch = priv->channel[WRITE];
1487         rch = priv->channel[READ];
1488
1489         switch (fsm_getstate(grp->fsm)) {
1490         case MPCG_STATE_XID2INITW:
1491                 /* Unless there is outstanding IO on the  */
1492                 /* channel just return and wait for ATTN  */
1493                 /* interrupt to begin XID negotiations    */
1494                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1495                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1496                         break;
1497         default:
1498                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1499         }
1500
1501         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1502                         "%s: dev=%s exit",
1503                         CTCM_FUNTAIL, dev->name);
1504         return;
1505 }
1506
1507 /*
1508  * MPC Group Station FSM action
1509  * CTCM_PROTO_MPC only
1510  */
1511 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1512 {
1513         struct mpcg_info   *mpcginfo   = arg;
1514         struct channel     *ch         = mpcginfo->ch;
1515         struct net_device  *dev;
1516         struct ctcm_priv   *priv;
1517         struct mpc_group   *grp;
1518
1519         if (ch) {
1520                 dev = ch->netdev;
1521                 if (dev) {
1522                         priv = dev->ml_priv;
1523                         if (priv) {
1524                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1525                                         "%s: %s: %s\n",
1526                                         CTCM_FUNTAIL, dev->name, ch->id);
1527                                 grp = priv->mpcg;
1528                                 grp->send_qllc_disc = 1;
1529                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1530                         }
1531                 }
1532         }
1533
1534         return;
1535 }
1536
1537 /*
1538  * MPC Group Station - not part of FSM
1539  * CTCM_PROTO_MPC only
1540  * called from add_channel in ctcm_main.c
1541  */
1542 void mpc_action_send_discontact(unsigned long thischan)
1543 {
1544         int rc;
1545         struct channel  *ch = (struct channel *)thischan;
1546         unsigned long   saveflags = 0;
1547
1548         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1549         rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1550                                         (unsigned long)ch, 0xff, 0);
1551         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1552
1553         if (rc != 0) {
1554                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1555         }
1556
1557         return;
1558 }
1559
1560
1561 /*
1562  * helper function of mpc FSM
1563  * CTCM_PROTO_MPC only
1564  * mpc_action_rcvd_xid7
1565 */
1566 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1567 {
1568         struct channel     *ch   = mpcginfo->ch;
1569         struct net_device  *dev  = ch->netdev;
1570         struct ctcm_priv   *priv = dev->ml_priv;
1571         struct mpc_group   *grp  = priv->mpcg;
1572         struct xid2        *xid  = mpcginfo->xid;
1573         int     rc       = 0;
1574         __u64   our_id   = 0;
1575         __u64   their_id = 0;
1576         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1577
1578         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1579
1580         if (xid == NULL) {
1581                 rc = 1;
1582                 /* XID REJECTED: xid == NULL */
1583                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1584                         "%s(%s): xid = NULL",
1585                                 CTCM_FUNTAIL, ch->id);
1586                         goto done;
1587         }
1588
1589         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1590
1591         /*the received direction should be the opposite of ours  */
1592         if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE :
1593                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1594                 rc = 2;
1595                 /* XID REJECTED: r/w channel pairing mismatch */
1596                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1597                         "%s(%s): r/w channel pairing mismatch",
1598                                 CTCM_FUNTAIL, ch->id);
1599                         goto done;
1600         }
1601
1602         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1603                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1604                                 grp->group_max_buflen, xid->xid2_buf_len);
1605
1606                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1607                                                 xid->xid2_buf_len - len)
1608                         grp->group_max_buflen = xid->xid2_buf_len - len;
1609         }
1610
1611         if (grp->saved_xid2 == NULL) {
1612                 grp->saved_xid2 =
1613                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1614
1615                 memcpy(skb_put(grp->rcvd_xid_skb,
1616                                         XID2_LENGTH), xid, XID2_LENGTH);
1617                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1618
1619                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1620                 grp->rcvd_xid_skb->len = 0;
1621
1622                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1623                 our_id = (__u64)priv->xid->xid2_adj_id;
1624                 our_id = our_id << 32;
1625                 our_id = our_id + priv->xid->xid2_sender_id;
1626                 their_id = (__u64)xid->xid2_adj_id;
1627                 their_id = their_id << 32;
1628                 their_id = their_id + xid->xid2_sender_id;
1629                 /* lower id assume the xside role */
1630                 if (our_id < their_id) {
1631                         grp->roll = XSIDE;
1632                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1633                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1634                                         CTCM_FUNTAIL, ch->id);
1635                 } else {
1636                         grp->roll = YSIDE;
1637                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1638                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1639                                         CTCM_FUNTAIL, ch->id);
1640                 }
1641
1642         } else {
1643                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1644                         rc = 3;
1645                         /* XID REJECTED: xid flag byte4 mismatch */
1646                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1647                                 "%s(%s): xid flag byte4 mismatch",
1648                                         CTCM_FUNTAIL, ch->id);
1649                 }
1650                 if (xid->xid2_flag2 == 0x40) {
1651                         rc = 4;
1652                         /* XID REJECTED - xid NOGOOD */
1653                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1654                                 "%s(%s): xid NOGOOD",
1655                                         CTCM_FUNTAIL, ch->id);
1656                 }
1657                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1658                         rc = 5;
1659                         /* XID REJECTED - Adjacent Station ID Mismatch */
1660                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1661                                 "%s(%s): Adjacent Station ID Mismatch",
1662                                         CTCM_FUNTAIL, ch->id);
1663                 }
1664                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1665                         rc = 6;
1666                         /* XID REJECTED - Sender Address Mismatch */
1667                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1668                                 "%s(%s): Sender Address Mismatch",
1669                                         CTCM_FUNTAIL, ch->id);
1670                 }
1671         }
1672 done:
1673         if (rc) {
1674                 dev_warn(&dev->dev,
1675                         "The XID used in the MPC protocol is not valid, "
1676                         "rc = %d\n", rc);
1677                 priv->xid->xid2_flag2 = 0x40;
1678                 grp->saved_xid2->xid2_flag2 = 0x40;
1679         }
1680
1681         return rc;
1682 }
1683
1684 /*
1685  * MPC Group Station FSM action
1686  * CTCM_PROTO_MPC only
1687  */
1688 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1689 {
1690         struct channel *ch = arg;
1691         int rc = 0;
1692         int gotlock = 0;
1693         unsigned long saveflags = 0;    /* avoids compiler warning with
1694                                            spin_unlock_irqrestore */
1695
1696         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1697                         __func__, smp_processor_id(), ch, ch->id);
1698
1699         if (ctcm_checkalloc_buffer(ch))
1700                                         goto done;
1701
1702         /*
1703          * skb data-buffer referencing:
1704          */
1705         ch->trans_skb->data = ch->trans_skb_data;
1706         skb_reset_tail_pointer(ch->trans_skb);
1707         ch->trans_skb->len = 0;
1708         /* result of the previous 3 statements is NOT always
1709          * already set after ctcm_checkalloc_buffer
1710          * because of possible reuse of the trans_skb
1711          */
1712         memset(ch->trans_skb->data, 0, 16);
1713         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1714         /* check is main purpose here: */
1715         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1716         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1717         /* check is main purpose here: */
1718         skb_put(ch->trans_skb, XID2_LENGTH);
1719         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1720         /* cleanup back to startpoint */
1721         ch->trans_skb->data = ch->trans_skb_data;
1722         skb_reset_tail_pointer(ch->trans_skb);
1723         ch->trans_skb->len = 0;
1724
1725         /* non-checking rewrite of above skb data-buffer referencing: */
1726         /*
1727         memset(ch->trans_skb->data, 0, 16);
1728         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1729         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1730         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1731          */
1732
1733         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1734         ch->ccw[8].count        = 0;
1735         ch->ccw[8].cda          = 0x00;
1736
1737         if (!(ch->xid_th && ch->xid && ch->xid_id))
1738                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1739                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1740                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1741
1742         if (side == XSIDE) {
1743                 /* mpc_action_xside_xid */
1744                 if (ch->xid_th == NULL)
1745                                 goto done;
1746                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1747                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1748                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1749                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1750
1751                 if (ch->xid == NULL)
1752                                 goto done;
1753                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1754                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1755                 ch->ccw[10].count       = XID2_LENGTH;
1756                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1757
1758                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1759                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1760                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1761                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1762
1763                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1764                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1765                 ch->ccw[12].count       = XID2_LENGTH;
1766                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1767
1768                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1769                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1770
1771         } else { /* side == YSIDE : mpc_action_yside_xid */
1772                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1773                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1774                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1775                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1776
1777                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1778                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1779                 ch->ccw[10].count       = XID2_LENGTH;
1780                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1781
1782                 if (ch->xid_th == NULL)
1783                                 goto done;
1784                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1785                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1786                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1787                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1788
1789                 if (ch->xid == NULL)
1790                                 goto done;
1791                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1792                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1793                 ch->ccw[12].count       = XID2_LENGTH;
1794                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1795
1796                 if (ch->xid_id == NULL)
1797                                 goto done;
1798                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1799                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1800
1801         }
1802         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1803         ch->ccw[13].count       = 4;
1804
1805         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1806         ch->ccw[14].flags       = CCW_FLAG_SLI;
1807         ch->ccw[14].count       = 0;
1808         ch->ccw[14].cda         = 0;
1809
1810         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1811         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1812         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1813         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1814
1815         if (!in_irq()) {
1816                          /* Such conditional locking is a known problem for
1817                           * sparse because its static undeterministic.
1818                           * Warnings should be ignored here. */
1819                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1820                 gotlock = 1;
1821         }
1822
1823         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1824         rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1825                                 (unsigned long)ch, 0xff, 0);
1826
1827         if (gotlock)    /* see remark above about conditional locking */
1828                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1829
1830         if (rc != 0) {
1831                 ctcm_ccw_check_rc(ch, rc,
1832                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1833         }
1834
1835 done:
1836         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1837                                 __func__, ch, ch->id);
1838         return;
1839
1840 }
1841
1842 /*
1843  * MPC Group Station FSM action
1844  * CTCM_PROTO_MPC only
1845  */
1846 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1847 {
1848         mpc_action_side_xid(fsm, arg, XSIDE);
1849 }
1850
1851 /*
1852  * MPC Group Station FSM action
1853  * CTCM_PROTO_MPC only
1854  */
1855 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1856 {
1857         mpc_action_side_xid(fsm, arg, YSIDE);
1858 }
1859
1860 /*
1861  * MPC Group Station FSM action
1862  * CTCM_PROTO_MPC only
1863  */
1864 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1865 {
1866         struct channel     *ch   = arg;
1867         struct net_device  *dev  = ch->netdev;
1868         struct ctcm_priv   *priv = dev->ml_priv;
1869         struct mpc_group   *grp  = priv->mpcg;
1870
1871         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1872                         __func__, smp_processor_id(), ch, ch->id);
1873
1874         if (ch->xid == NULL) {
1875                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1876                         "%s(%s): ch->xid == NULL",
1877                                 CTCM_FUNTAIL, dev->name);
1878                 return;
1879         }
1880
1881         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1882
1883         ch->xid->xid2_option =  XID2_0;
1884
1885         switch (fsm_getstate(grp->fsm)) {
1886         case MPCG_STATE_XID2INITW:
1887         case MPCG_STATE_XID2INITX:
1888                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1889                 break;
1890         case MPCG_STATE_XID0IOWAIT:
1891         case MPCG_STATE_XID0IOWAIX:
1892                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1893                 break;
1894         }
1895
1896         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1897
1898         return;
1899 }
1900
1901 /*
1902  * MPC Group Station FSM action
1903  * CTCM_PROTO_MPC only
1904 */
1905 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1906 {
1907         struct net_device *dev = arg;
1908         struct ctcm_priv  *priv = dev->ml_priv;
1909         struct mpc_group  *grp  = NULL;
1910         int direction;
1911         int send = 0;
1912
1913         if (priv)
1914                 grp = priv->mpcg;
1915         if (grp == NULL)
1916                 return;
1917
1918         for (direction = READ; direction <= WRITE; direction++) {
1919                 struct channel *ch = priv->channel[direction];
1920                 struct xid2 *thisxid = ch->xid;
1921                 ch->xid_skb->data = ch->xid_skb_data;
1922                 skb_reset_tail_pointer(ch->xid_skb);
1923                 ch->xid_skb->len = 0;
1924                 thisxid->xid2_option = XID2_7;
1925                 send = 0;
1926
1927                 /* xid7 phase 1 */
1928                 if (grp->outstanding_xid7_p2 > 0) {
1929                         if (grp->roll == YSIDE) {
1930                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1931                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1932                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1933                                         memcpy(skb_put(ch->xid_skb,
1934                                                         TH_HEADER_LENGTH),
1935                                                &thdummy, TH_HEADER_LENGTH);
1936                                         send = 1;
1937                                 }
1938                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1939                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1940                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1941                                         memcpy(skb_put(ch->xid_skb,
1942                                                        TH_HEADER_LENGTH),
1943                                                &thnorm, TH_HEADER_LENGTH);
1944                                         send = 1;
1945                         }
1946                 } else {
1947                         /* xid7 phase 2 */
1948                         if (grp->roll == YSIDE) {
1949                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1950                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1951                                         memcpy(skb_put(ch->xid_skb,
1952                                                        TH_HEADER_LENGTH),
1953                                                &thnorm, TH_HEADER_LENGTH);
1954                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1955                                         send = 1;
1956                                 }
1957                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1958                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1959                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1960                                 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1961                                                 &thdummy, TH_HEADER_LENGTH);
1962                                 send = 1;
1963                         }
1964                 }
1965
1966                 if (send)
1967                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1968         }
1969
1970         return;
1971 }
1972
1973 /*
1974  * MPC Group Station FSM action
1975  * CTCM_PROTO_MPC only
1976  */
1977 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1978 {
1979
1980         struct mpcg_info   *mpcginfo  = arg;
1981         struct channel     *ch   = mpcginfo->ch;
1982         struct net_device  *dev  = ch->netdev;
1983         struct ctcm_priv   *priv = dev->ml_priv;
1984         struct mpc_group   *grp  = priv->mpcg;
1985
1986         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1987                         __func__, ch->id, grp->outstanding_xid2,
1988                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1989
1990         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1991                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1992
1993         grp->outstanding_xid2--;
1994         grp->outstanding_xid7++;
1995         grp->outstanding_xid7_p2++;
1996
1997         /* must change state before validating xid to */
1998         /* properly handle interim interrupts received*/
1999         switch (fsm_getstate(grp->fsm)) {
2000         case MPCG_STATE_XID2INITW:
2001                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
2002                 mpc_validate_xid(mpcginfo);
2003                 break;
2004         case MPCG_STATE_XID0IOWAIT:
2005                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
2006                 mpc_validate_xid(mpcginfo);
2007                 break;
2008         case MPCG_STATE_XID2INITX:
2009                 if (grp->outstanding_xid2 == 0) {
2010                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
2011                         mpc_validate_xid(mpcginfo);
2012                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2013                 }
2014                 break;
2015         case MPCG_STATE_XID0IOWAIX:
2016                 if (grp->outstanding_xid2 == 0) {
2017                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
2018                         mpc_validate_xid(mpcginfo);
2019                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2020                 }
2021                 break;
2022         }
2023         kfree(mpcginfo);
2024
2025         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2026                 __func__, ch->id, grp->outstanding_xid2,
2027                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2028         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2029                 __func__, ch->id,
2030                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2031         return;
2032
2033 }
2034
2035
2036 /*
2037  * MPC Group Station FSM action
2038  * CTCM_PROTO_MPC only
2039  */
2040 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2041 {
2042         struct mpcg_info   *mpcginfo   = arg;
2043         struct channel     *ch         = mpcginfo->ch;
2044         struct net_device  *dev        = ch->netdev;
2045         struct ctcm_priv   *priv    = dev->ml_priv;
2046         struct mpc_group   *grp     = priv->mpcg;
2047
2048         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2049                 __func__, smp_processor_id(), ch, ch->id);
2050         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2051                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2052
2053         grp->outstanding_xid7--;
2054         ch->xid_skb->data = ch->xid_skb_data;
2055         skb_reset_tail_pointer(ch->xid_skb);
2056         ch->xid_skb->len = 0;
2057
2058         switch (fsm_getstate(grp->fsm)) {
2059         case MPCG_STATE_XID7INITI:
2060                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2061                 mpc_validate_xid(mpcginfo);
2062                 break;
2063         case MPCG_STATE_XID7INITW:
2064                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2065                 mpc_validate_xid(mpcginfo);
2066                 break;
2067         case MPCG_STATE_XID7INITZ:
2068         case MPCG_STATE_XID7INITX:
2069                 if (grp->outstanding_xid7 == 0) {
2070                         if (grp->outstanding_xid7_p2 > 0) {
2071                                 grp->outstanding_xid7 =
2072                                         grp->outstanding_xid7_p2;
2073                                 grp->outstanding_xid7_p2 = 0;
2074                         } else
2075                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2076
2077                         mpc_validate_xid(mpcginfo);
2078                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2079                         break;
2080                 }
2081                 mpc_validate_xid(mpcginfo);
2082                 break;
2083         }
2084         kfree(mpcginfo);
2085         return;
2086 }
2087
2088 /*
2089  * mpc_action helper of an MPC Group Station FSM action
2090  * CTCM_PROTO_MPC only
2091  */
2092 static int mpc_send_qllc_discontact(struct net_device *dev)
2093 {
2094         __u32   new_len = 0;
2095         struct sk_buff   *skb;
2096         struct qllc      *qllcptr;
2097         struct ctcm_priv *priv = dev->ml_priv;
2098         struct mpc_group *grp = priv->mpcg;
2099
2100         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2101                 __func__, mpcg_state_names[grp->saved_state]);
2102
2103         switch (grp->saved_state) {
2104         /*
2105          * establish conn callback function is
2106          * preferred method to report failure
2107          */
2108         case MPCG_STATE_XID0IOWAIT:
2109         case MPCG_STATE_XID0IOWAIX:
2110         case MPCG_STATE_XID7INITI:
2111         case MPCG_STATE_XID7INITZ:
2112         case MPCG_STATE_XID2INITW:
2113         case MPCG_STATE_XID2INITX:
2114         case MPCG_STATE_XID7INITW:
2115         case MPCG_STATE_XID7INITX:
2116                 if (grp->estconnfunc) {
2117                         grp->estconnfunc(grp->port_num, -1, 0);
2118                         grp->estconnfunc = NULL;
2119                         break;
2120                 }
2121         case MPCG_STATE_FLOWC:
2122         case MPCG_STATE_READY:
2123                 grp->send_qllc_disc = 2;
2124                 new_len = sizeof(struct qllc);
2125                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2126                 if (qllcptr == NULL) {
2127                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2128                                 "%s(%s): qllcptr allocation error",
2129                                                 CTCM_FUNTAIL, dev->name);
2130                         return -ENOMEM;
2131                 }
2132
2133                 qllcptr->qllc_address = 0xcc;
2134                 qllcptr->qllc_commands = 0x03;
2135
2136                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2137
2138                 if (skb == NULL) {
2139                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2140                                 "%s(%s): skb allocation error",
2141                                                 CTCM_FUNTAIL, dev->name);
2142                         priv->stats.rx_dropped++;
2143                         kfree(qllcptr);
2144                         return -ENOMEM;
2145                 }
2146
2147                 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2148                 kfree(qllcptr);
2149
2150                 if (skb_headroom(skb) < 4) {
2151                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2152                                 "%s(%s): skb_headroom error",
2153                                                 CTCM_FUNTAIL, dev->name);
2154                         dev_kfree_skb_any(skb);
2155                         return -ENOMEM;
2156                 }
2157
2158                 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq;
2159                 priv->channel[READ]->pdu_seq++;
2160                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2161                                 __func__, priv->channel[READ]->pdu_seq);
2162
2163                 /* receipt of CC03 resets anticipated sequence number on
2164                       receiving side */
2165                 priv->channel[READ]->pdu_seq = 0x00;
2166                 skb_reset_mac_header(skb);
2167                 skb->dev = dev;
2168                 skb->protocol = htons(ETH_P_SNAP);
2169                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2170
2171                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2172
2173                 netif_rx(skb);
2174                 break;
2175         default:
2176                 break;
2177
2178         }
2179
2180         return 0;
2181 }
2182 /* --- This is the END my friend --- */
2183