drivers/s390/net/ctcm_mpc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copyright IBM Corp. 2004, 2007
   4  *      Authors:        Belinda Thompson (belindat@us.ibm.com)
   5  *                      Andy Richter (richtera@us.ibm.com)
   6  *                      Peter Tiedemann (ptiedem@de.ibm.com)
   7  */
   8
   9 /*
  10         This module exports functions to be used by CCS:
  11         EXPORT_SYMBOL(ctc_mpc_alloc_channel);
  12         EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
  13         EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
  14         EXPORT_SYMBOL(ctc_mpc_flow_control);
  15 */
  16
  17 #undef DEBUG
  18 #undef DEBUGDATA
  19 #undef DEBUGCCW
  20
  21 #define KMSG_COMPONENT "ctcm"
  22 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  23
  24 #include <linux/module.h>
  25 #include <linux/init.h>
  26 #include <linux/kernel.h>
  27 #include <linux/slab.h>
  28 #include <linux/errno.h>
  29 #include <linux/types.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/timer.h>
  32 #include <linux/sched.h>
  33
  34 #include <linux/signal.h>
  35 #include <linux/string.h>
  36 #include <linux/proc_fs.h>
  37
  38 #include <linux/ip.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/tcp.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/ctype.h>
  43 #include <linux/netdevice.h>
  44 #include <net/dst.h>
  45
  46 #include <linux/io.h>           /* instead of <asm/io.h> ok ? */
  47 #include <asm/ccwdev.h>
  48 #include <asm/ccwgroup.h>
  49 #include <linux/bitops.h>       /* instead of <asm/bitops.h> ok ? */
  50 #include <linux/uaccess.h>      /* instead of <asm/uaccess.h> ok ? */
  51 #include <linux/wait.h>
  52 #include <linux/moduleparam.h>
  53 #include <asm/idals.h>
  54
  55 #include "ctcm_main.h"
  56 #include "ctcm_mpc.h"
  57 #include "ctcm_fsms.h"
  58
  59 static const struct xid2 init_xid = {
  60         .xid2_type_id   =       XID_FM2,
  61         .xid2_len       =       0x45,
  62         .xid2_adj_id    =       0,
  63         .xid2_rlen      =       0x31,
  64         .xid2_resv1     =       0,
  65         .xid2_flag1     =       0,
  66         .xid2_fmtt      =       0,
  67         .xid2_flag4     =       0x80,
  68         .xid2_resv2     =       0,
  69         .xid2_tgnum     =       0,
  70         .xid2_sender_id =       0,
  71         .xid2_flag2     =       0,
  72         .xid2_option    =       XID2_0,
  73         .xid2_resv3     =       "\x00",
  74         .xid2_resv4     =       0,
  75         .xid2_dlc_type  =       XID2_READ_SIDE,
  76         .xid2_resv5     =       0,
  77         .xid2_mpc_flag  =       0,
  78         .xid2_resv6     =       0,
  79         .xid2_buf_len   =       (MPC_BUFSIZE_DEFAULT - 35),
  80 };
  81
  82 static const struct th_header thnorm = {
  83         .th_seg         =       0x00,
  84         .th_ch_flag     =       TH_IS_XID,
  85         .th_blk_flag    =       TH_DATA_IS_XID,
  86         .th_is_xid      =       0x01,
  87         .th_seq_num     =       0x00000000,
  88 };
  89
  90 static const struct th_header thdummy = {
  91         .th_seg         =       0x00,
  92         .th_ch_flag     =       0x00,
  93         .th_blk_flag    =       TH_DATA_IS_XID,
  94         .th_is_xid      =       0x01,
  95         .th_seq_num     =       0x00000000,
  96 };
  97
  98 /*
  99  * Definition of one MPC group
 100  */
 101
 102 /*
 103  * Compatibility macros for busy handling
 104  * of network devices.
 105  */
 106
 107 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 108
 109 /*
 110  * MPC Group state machine actions (static prototypes)
 111  */
 112 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
 113 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
 114 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
 115 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
 116 static int  mpc_validate_xid(struct mpcg_info *mpcginfo);
 117 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
 118 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
 119 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
 120 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
 121 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
 122 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
 123
 124 #ifdef DEBUGDATA
 125 /*-------------------------------------------------------------------*
 126 * Dump buffer format                                                 *
 127 *                                                                    *
 128 *--------------------------------------------------------------------*/
 129 void ctcmpc_dumpit(char *buf, int len)
 130 {
 131         __u32   ct, sw, rm, dup;
 132         char    *ptr, *rptr;
 133         char    tbuf[82], tdup[82];
 134         char    addr[22];
 135         char    boff[12];
 136         char    bhex[82], duphex[82];
 137         char    basc[40];
 138
 139         sw  = 0;
 140         rptr = ptr = buf;
 141         rm  = 16;
 142         duphex[0] = 0x00;
 143         dup = 0;
 144
 145         for (ct = 0; ct < len; ct++, ptr++, rptr++) {
 146                 if (sw == 0) {
 147                         sprintf(addr, "%16.16llx", (__u64)rptr);
 148
 149                         sprintf(boff, "%4.4X", (__u32)ct);
 150                         bhex[0] = '\0';
 151                         basc[0] = '\0';
 152                 }
 153                 if ((sw == 4) || (sw == 12))
 154                         strcat(bhex, " ");
 155                 if (sw == 8)
 156                         strcat(bhex, "  ");
 157
 158                 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
 159
 160                 tbuf[2] = '\0';
 161                 strcat(bhex, tbuf);
 162                 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
 163                         basc[sw] = *ptr;
 164                 else
 165                         basc[sw] = '.';
 166
 167                 basc[sw+1] = '\0';
 168                 sw++;
 169                 rm--;
 170                 if (sw != 16)
 171                         continue;
 172                 if ((strcmp(duphex, bhex)) != 0) {
 173                         if (dup != 0) {
 174                                 sprintf(tdup,
 175                                         "Duplicate as above to %s", addr);
 176                                 ctcm_pr_debug("                --- %s ---\n",
 177                                                 tdup);
 178                         }
 179                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 180                                         addr, boff, bhex, basc);
 181                         dup = 0;
 182                         strcpy(duphex, bhex);
 183                 } else
 184                         dup++;
 185
 186                 sw = 0;
 187                 rm = 16;
 188         }  /* endfor */
 189
 190         if (sw != 0) {
 191                 for ( ; rm > 0; rm--, sw++) {
 192                         if ((sw == 4) || (sw == 12))
 193                                 strcat(bhex, " ");
 194                         if (sw == 8)
 195                                 strcat(bhex, "  ");
 196                         strcat(bhex, "  ");
 197                         strcat(basc, " ");
 198                 }
 199                 if (dup != 0) {
 200                         sprintf(tdup, "Duplicate as above to %s", addr);
 201                         ctcm_pr_debug("                --- %s ---\n", tdup);
 202                 }
 203                 ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 204                                         addr, boff, bhex, basc);
 205         } else {
 206                 if (dup >= 1) {
 207                         sprintf(tdup, "Duplicate as above to %s", addr);
 208                         ctcm_pr_debug("                --- %s ---\n", tdup);
 209                 }
 210                 if (dup != 0) {
 211                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 212                                 addr, boff, bhex, basc);
 213                 }
 214         }
 215
 216         return;
 217
 218 }   /*   end of ctcmpc_dumpit  */
 219 #endif
 220
 221 #ifdef DEBUGDATA
 222 /*
 223  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 224  *
 225  * skb          The sk_buff to dump.
 226  * offset       Offset relative to skb-data, where to start the dump.
 227  */
 228 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
 229 {
 230         __u8 *p = skb->data;
 231         struct th_header *header;
 232         struct pdu *pheader;
 233         int bl = skb->len;
 234         int i;
 235
 236         if (p == NULL)
 237                 return;
 238
 239         p += offset;
 240         header = (struct th_header *)p;
 241
 242         ctcm_pr_debug("dump:\n");
 243         ctcm_pr_debug("skb len=%d \n", skb->len);
 244         if (skb->len > 2) {
 245                 switch (header->th_ch_flag) {
 246                 case TH_HAS_PDU:
 247                         break;
 248                 case 0x00:
 249                 case TH_IS_XID:
 250                         if ((header->th_blk_flag == TH_DATA_IS_XID) &&
 251                            (header->th_is_xid == 0x01))
 252                                 goto dumpth;
 253                 case TH_SWEEP_REQ:
 254                                 goto dumpth;
 255                 case TH_SWEEP_RESP:
 256                                 goto dumpth;
 257                 default:
 258                         break;
 259                 }
 260
 261                 pheader = (struct pdu *)p;
 262                 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
 263                                pheader->pdu_offset, pheader->pdu_offset);
 264                 ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
 265                 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
 266                 ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
 267                                         goto dumpdata;
 268
 269 dumpth:
 270                 ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
 271                 ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
 272                 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
 273                 ctcm_pr_debug("th->type    : %s\n",
 274                                (header->th_is_xid) ? "DATA" : "XID");
 275                 ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
 276
 277         }
 278 dumpdata:
 279         if (bl > 32)
 280                 bl = 32;
 281         ctcm_pr_debug("data: ");
 282         for (i = 0; i < bl; i++)
 283                 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
 284         ctcm_pr_debug("\n");
 285 }
 286 #endif
 287
 288 static struct net_device *ctcmpc_get_dev(int port_num)
 289 {
 290         char device[20];
 291         struct net_device *dev;
 292         struct ctcm_priv *priv;
 293
 294         sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
 295
 296         dev = __dev_get_by_name(&init_net, device);
 297
 298         if (dev == NULL) {
 299                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 300                         "%s: Device not found by name: %s",
 301                                         CTCM_FUNTAIL, device);
 302                 return NULL;
 303         }
 304         priv = dev->ml_priv;
 305         if (priv == NULL) {
 306                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 307                         "%s(%s): dev->ml_priv is NULL",
 308                                         CTCM_FUNTAIL, device);
 309                 return NULL;
 310         }
 311         if (priv->mpcg == NULL) {
 312                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 313                         "%s(%s): priv->mpcg is NULL",
 314                                         CTCM_FUNTAIL, device);
 315                 return NULL;
 316         }
 317         return dev;
 318 }
 319
 320 /*
 321  * ctc_mpc_alloc_channel
 322  *      (exported interface)
 323  *
 324  * Device Initialization :
 325  *      ACTPATH  driven IO operations
 326  */
 327 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
 328 {
 329         struct net_device *dev;
 330         struct mpc_group *grp;
 331         struct ctcm_priv *priv;
 332
 333         dev = ctcmpc_get_dev(port_num);
 334         if (dev == NULL)
 335                 return 1;
 336         priv = dev->ml_priv;
 337         grp = priv->mpcg;
 338
 339         grp->allochanfunc = callback;
 340         grp->port_num = port_num;
 341         grp->port_persist = 1;
 342
 343         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 344                         "%s(%s): state=%s",
 345                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 346
 347         switch (fsm_getstate(grp->fsm)) {
 348         case MPCG_STATE_INOP:
 349                 /* Group is in the process of terminating */
 350                 grp->alloc_called = 1;
 351                 break;
 352         case MPCG_STATE_RESET:
 353                 /* MPC Group will transition to state             */
 354                 /* MPCG_STATE_XID2INITW iff the minimum number    */
 355                 /* of 1 read and 1 write channel have successfully*/
 356                 /* activated                                      */
 357                 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
 358                 if (callback)
 359                         grp->send_qllc_disc = 1;
 360                 /* Else, fall through */
 361         case MPCG_STATE_XID0IOWAIT:
 362                 fsm_deltimer(&grp->timer);
 363                 grp->outstanding_xid2 = 0;
 364                 grp->outstanding_xid7 = 0;
 365                 grp->outstanding_xid7_p2 = 0;
 366                 grp->saved_xid2 = NULL;
 367                 if (callback)
 368                         ctcm_open(dev);
 369                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 370                 break;
 371         case MPCG_STATE_READY:
 372                 /* XID exchanges completed after PORT was activated */
 373                 /* Link station already active                      */
 374                 /* Maybe timing issue...retry callback              */
 375                 grp->allocchan_callback_retries++;
 376                 if (grp->allocchan_callback_retries < 4) {
 377                         if (grp->allochanfunc)
 378                                 grp->allochanfunc(grp->port_num,
 379                                                   grp->group_max_buflen);
 380                 } else {
 381                         /* there are problems...bail out            */
 382                         /* there may be a state mismatch so restart */
 383                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 384                         grp->allocchan_callback_retries = 0;
 385                 }
 386                 break;
 387         }
 388
 389         return 0;
 390 }
 391 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 392
 393 /*
 394  * ctc_mpc_establish_connectivity
 395  *      (exported interface)
 396  */
 397 void ctc_mpc_establish_connectivity(int port_num,
 398                                 void (*callback)(int, int, int))
 399 {
 400         struct net_device *dev;
 401         struct mpc_group *grp;
 402         struct ctcm_priv *priv;
 403         struct channel *rch, *wch;
 404
 405         dev = ctcmpc_get_dev(port_num);
 406         if (dev == NULL)
 407                 return;
 408         priv = dev->ml_priv;
 409         grp = priv->mpcg;
 410         rch = priv->channel[CTCM_READ];
 411         wch = priv->channel[CTCM_WRITE];
 412
 413         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 414                         "%s(%s): state=%s",
 415                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 416
 417         grp->estconnfunc = callback;
 418         grp->port_num = port_num;
 419
 420         switch (fsm_getstate(grp->fsm)) {
 421         case MPCG_STATE_READY:
 422                 /* XID exchanges completed after PORT was activated */
 423                 /* Link station already active                      */
 424                 /* Maybe timing issue...retry callback              */
 425                 fsm_deltimer(&grp->timer);
 426                 grp->estconn_callback_retries++;
 427                 if (grp->estconn_callback_retries < 4) {
 428                         if (grp->estconnfunc) {
 429                                 grp->estconnfunc(grp->port_num, 0,
 430                                                 grp->group_max_buflen);
 431                                 grp->estconnfunc = NULL;
 432                         }
 433                 } else {
 434                         /* there are problems...bail out         */
 435                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 436                         grp->estconn_callback_retries = 0;
 437                 }
 438                 break;
 439         case MPCG_STATE_INOP:
 440         case MPCG_STATE_RESET:
 441                 /* MPC Group is not ready to start XID - min num of */
 442                 /* 1 read and 1 write channel have not been acquired*/
 443
 444                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 445                         "%s(%s): REJECTED - inactive channels",
 446                                         CTCM_FUNTAIL, dev->name);
 447                 if (grp->estconnfunc) {
 448                         grp->estconnfunc(grp->port_num, -1, 0);
 449                         grp->estconnfunc = NULL;
 450                 }
 451                 break;
 452         case MPCG_STATE_XID2INITW:
 453                 /* alloc channel was called but no XID exchange    */
 454                 /* has occurred. initiate xside XID exchange       */
 455                 /* make sure yside XID0 processing has not started */
 456
 457                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 458                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 459                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 460                                 "%s(%s): ABORT - PASSIVE XID",
 461                                         CTCM_FUNTAIL, dev->name);
 462                         break;
 463                 }
 464                 grp->send_qllc_disc = 1;
 465                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 466                 fsm_deltimer(&grp->timer);
 467                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 468                                                 MPCG_EVENT_TIMER, dev);
 469                 grp->outstanding_xid7 = 0;
 470                 grp->outstanding_xid7_p2 = 0;
 471                 grp->saved_xid2 = NULL;
 472                 if ((rch->in_mpcgroup) &&
 473                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 474                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 475                 else {
 476                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 477                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 478                                         CTCM_FUNTAIL, dev->name, rch->id);
 479                         if (grp->estconnfunc) {
 480                                 grp->estconnfunc(grp->port_num, -1, 0);
 481                                 grp->estconnfunc = NULL;
 482                         }
 483                         fsm_deltimer(&grp->timer);
 484                                 goto done;
 485                 }
 486                 if ((wch->in_mpcgroup) &&
 487                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 488                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 489                 else {
 490                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 491                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 492                                         CTCM_FUNTAIL, dev->name, wch->id);
 493                         if (grp->estconnfunc) {
 494                                 grp->estconnfunc(grp->port_num, -1, 0);
 495                                 grp->estconnfunc = NULL;
 496                         }
 497                         fsm_deltimer(&grp->timer);
 498                                 goto done;
 499                         }
 500                 break;
 501         case MPCG_STATE_XID0IOWAIT:
 502                 /* already in active XID negotiations */
 503         default:
 504                 break;
 505         }
 506
 507 done:
 508         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 509         return;
 510 }
 511 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 512
 513 /*
 514  * ctc_mpc_dealloc_ch
 515  *      (exported interface)
 516  */
 517 void ctc_mpc_dealloc_ch(int port_num)
 518 {
 519         struct net_device *dev;
 520         struct ctcm_priv *priv;
 521         struct mpc_group *grp;
 522
 523         dev = ctcmpc_get_dev(port_num);
 524         if (dev == NULL)
 525                 return;
 526         priv = dev->ml_priv;
 527         grp = priv->mpcg;
 528
 529         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 530                         "%s: %s: refcount = %d\n",
 531                         CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
 532
 533         fsm_deltimer(&priv->restart_timer);
 534         grp->channels_terminating = 0;
 535         fsm_deltimer(&grp->timer);
 536         grp->allochanfunc = NULL;
 537         grp->estconnfunc = NULL;
 538         grp->port_persist = 0;
 539         grp->send_qllc_disc = 0;
 540         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 541
 542         ctcm_close(dev);
 543         return;
 544 }
 545 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 546
 547 /*
 548  * ctc_mpc_flow_control
 549  *      (exported interface)
 550  */
 551 void ctc_mpc_flow_control(int port_num, int flowc)
 552 {
 553         struct ctcm_priv *priv;
 554         struct mpc_group *grp;
 555         struct net_device *dev;
 556         struct channel *rch;
 557         int mpcg_state;
 558
 559         dev = ctcmpc_get_dev(port_num);
 560         if (dev == NULL)
 561                 return;
 562         priv = dev->ml_priv;
 563         grp = priv->mpcg;
 564
 565         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 566                         "%s: %s: flowc = %d",
 567                                 CTCM_FUNTAIL, dev->name, flowc);
 568
 569         rch = priv->channel[CTCM_READ];
 570
 571         mpcg_state = fsm_getstate(grp->fsm);
 572         switch (flowc) {
 573         case 1:
 574                 if (mpcg_state == MPCG_STATE_FLOWC)
 575                         break;
 576                 if (mpcg_state == MPCG_STATE_READY) {
 577                         if (grp->flow_off_called == 1)
 578                                 grp->flow_off_called = 0;
 579                         else
 580                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 581                         break;
 582                 }
 583                 break;
 584         case 0:
 585                 if (mpcg_state == MPCG_STATE_FLOWC) {
 586                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 587                         /* ensure any data that has accumulated */
 588                         /* on the io_queue will now be sen t    */
 589                         tasklet_schedule(&rch->ch_tasklet);
 590                 }
 591                 /* possible race condition                      */
 592                 if (mpcg_state == MPCG_STATE_READY) {
 593                         grp->flow_off_called = 1;
 594                         break;
 595                 }
 596                 break;
 597         }
 598
 599 }
 600 EXPORT_SYMBOL(ctc_mpc_flow_control);
 601
 602 static int mpc_send_qllc_discontact(struct net_device *);
 603
 604 /*
 605  * helper function of ctcmpc_unpack_skb
 606 */
 607 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 608 {
 609         struct channel    *rch = mpcginfo->ch;
 610         struct net_device *dev = rch->netdev;
 611         struct ctcm_priv   *priv = dev->ml_priv;
 612         struct mpc_group  *grp = priv->mpcg;
 613         struct channel    *ch = priv->channel[CTCM_WRITE];
 614
 615         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 616         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 617
 618         grp->sweep_rsp_pend_num--;
 619
 620         if ((grp->sweep_req_pend_num == 0) &&
 621                         (grp->sweep_rsp_pend_num == 0)) {
 622                 fsm_deltimer(&ch->sweep_timer);
 623                 grp->in_sweep = 0;
 624                 rch->th_seq_num = 0x00;
 625                 ch->th_seq_num = 0x00;
 626                 ctcm_clear_busy_do(dev);
 627         }
 628
 629         kfree(mpcginfo);
 630
 631         return;
 632
 633 }
 634
 635 /*
 636  * helper function of mpc_rcvd_sweep_req
 637  * which is a helper of ctcmpc_unpack_skb
 638  */
 639 static void ctcmpc_send_sweep_resp(struct channel *rch)
 640 {
 641         struct net_device *dev = rch->netdev;
 642         struct ctcm_priv *priv = dev->ml_priv;
 643         struct mpc_group *grp = priv->mpcg;
 644         struct th_sweep *header;
 645         struct sk_buff *sweep_skb;
 646         struct channel *ch  = priv->channel[CTCM_WRITE];
 647
 648         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 649
 650         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 651         if (sweep_skb == NULL) {
 652                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 653                         "%s(%s): sweep_skb allocation ERROR\n",
 654                         CTCM_FUNTAIL, rch->id);
 655                 goto done;
 656         }
 657
 658         header = kmalloc(sizeof(struct th_sweep), gfp_type());
 659
 660         if (!header) {
 661                 dev_kfree_skb_any(sweep_skb);
 662                 goto done;
 663         }
 664
 665         header->th.th_seg       = 0x00 ;
 666         header->th.th_ch_flag   = TH_SWEEP_RESP;
 667         header->th.th_blk_flag  = 0x00;
 668         header->th.th_is_xid    = 0x00;
 669         header->th.th_seq_num   = 0x00;
 670         header->sw.th_last_seq  = ch->th_seq_num;
 671
 672         skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 673
 674         kfree(header);
 675
 676         netif_trans_update(dev);
 677         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 678
 679         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 680
 681         return;
 682
 683 done:
 684         grp->in_sweep = 0;
 685         ctcm_clear_busy_do(dev);
 686         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 687
 688         return;
 689 }
 690
 691 /*
 692  * helper function of ctcmpc_unpack_skb
 693  */
 694 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 695 {
 696         struct channel    *rch     = mpcginfo->ch;
 697         struct net_device *dev     = rch->netdev;
 698         struct ctcm_priv  *priv = dev->ml_priv;
 699         struct mpc_group  *grp  = priv->mpcg;
 700         struct channel    *ch      = priv->channel[CTCM_WRITE];
 701
 702         if (do_debug)
 703                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 704                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 705
 706         if (grp->in_sweep == 0) {
 707                 grp->in_sweep = 1;
 708                 ctcm_test_and_set_busy(dev);
 709                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 710                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 711         }
 712
 713         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 714
 715         grp->sweep_req_pend_num--;
 716         ctcmpc_send_sweep_resp(ch);
 717         kfree(mpcginfo);
 718         return;
 719 }
 720
 721 /*
 722   * MPC Group Station FSM definitions
 723  */
 724 static const char *mpcg_event_names[] = {
 725         [MPCG_EVENT_INOP]       = "INOP Condition",
 726         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 727         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 728         [MPCG_EVENT_XID2]       = "XID2 Received",
 729         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 730         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 731         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 732         [MPCG_EVENT_DOIO]       = "XID DoIO",
 733 };
 734
 735 static const char *mpcg_state_names[] = {
 736         [MPCG_STATE_RESET]      = "Reset",
 737         [MPCG_STATE_INOP]       = "INOP",
 738         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 739         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 740         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 741         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 742         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 743         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 744         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 745         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 746         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 747         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 748         [MPCG_STATE_READY]      = "READY",
 749 };
 750
 751 /*
 752  * The MPC Group Station FSM
 753  *   22 events
 754  */
 755 static const fsm_node mpcg_fsm[] = {
 756         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 757         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 758         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 759
 760         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 761         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 762
 763         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 764         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 765         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 766         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 767         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 768
 769         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 770         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 771         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 772         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 773         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 774
 775         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 776         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 777         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 778         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 779         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 780         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 781         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 782
 783         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 784         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 785         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 786         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 787         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 788         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 789
 790         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 791         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 792         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 793         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 794         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 795         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 796
 797         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 798         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 799         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 800         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 801         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 802         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 803
 804         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 805         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 806         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 807         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 808         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 809         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 810         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 811
 812         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 813         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 814         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 815         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 816         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 817         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 818
 819         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 820         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 821 };
 822
 823 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 824
 825 /*
 826  * MPC Group Station FSM action
 827  * CTCM_PROTO_MPC only
 828  */
 829 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 830 {
 831         struct net_device *dev = arg;
 832         struct ctcm_priv *priv = dev->ml_priv;
 833         struct mpc_group *grp = priv->mpcg;
 834
 835         if (grp == NULL) {
 836                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 837                         "%s(%s): No MPC group",
 838                                 CTCM_FUNTAIL, dev->name);
 839                 return;
 840         }
 841
 842         fsm_deltimer(&grp->timer);
 843
 844         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 845                 priv->xid->xid2_flag2 = 0x00;
 846                 if (grp->estconnfunc) {
 847                         grp->estconnfunc(grp->port_num, 1,
 848                                         grp->group_max_buflen);
 849                         grp->estconnfunc = NULL;
 850                 } else if (grp->allochanfunc)
 851                         grp->send_qllc_disc = 1;
 852
 853                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 854                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 855                                 "%s(%s): fails",
 856                                         CTCM_FUNTAIL, dev->name);
 857                 return;
 858         }
 859
 860         grp->port_persist = 1;
 861         grp->out_of_sequence = 0;
 862         grp->estconn_called = 0;
 863
 864         tasklet_hi_schedule(&grp->mpc_tasklet2);
 865
 866         return;
 867 }
 868
 869 /*
 870  * helper of ctcm_init_netdevice
 871  * CTCM_PROTO_MPC only
 872  */
 873 void mpc_group_ready(unsigned long adev)
 874 {
 875         struct net_device *dev = (struct net_device *)adev;
 876         struct ctcm_priv *priv = dev->ml_priv;
 877         struct mpc_group *grp = priv->mpcg;
 878         struct channel *ch = NULL;
 879
 880         if (grp == NULL) {
 881                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 882                         "%s(%s): No MPC group",
 883                                 CTCM_FUNTAIL, dev->name);
 884                 return;
 885         }
 886
 887         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 888                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 889                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 890
 891         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 892
 893         /* Put up a read on the channel */
 894         ch = priv->channel[CTCM_READ];
 895         ch->pdu_seq = 0;
 896         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 897                         __func__, ch->pdu_seq);
 898
 899         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 900         /* Put the write channel in idle state */
 901         ch = priv->channel[CTCM_WRITE];
 902         if (ch->collect_len > 0) {
 903                 spin_lock(&ch->collect_lock);
 904                 ctcm_purge_skb_queue(&ch->collect_queue);
 905                 ch->collect_len = 0;
 906                 spin_unlock(&ch->collect_lock);
 907         }
 908         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 909         ctcm_clear_busy(dev);
 910
 911         if (grp->estconnfunc) {
 912                 grp->estconnfunc(grp->port_num, 0,
 913                                     grp->group_max_buflen);
 914                 grp->estconnfunc = NULL;
 915         } else  if (grp->allochanfunc)
 916                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 917
 918         grp->send_qllc_disc = 1;
 919         grp->changed_side = 0;
 920
 921         return;
 922
 923 }
 924
 925 /*
 926  * Increment the MPC Group Active Channel Counts
 927  * helper of dev_action (called from channel fsm)
 928  */
 929 void mpc_channel_action(struct channel *ch, int direction, int action)
 930 {
 931         struct net_device  *dev  = ch->netdev;
 932         struct ctcm_priv   *priv = dev->ml_priv;
 933         struct mpc_group   *grp  = priv->mpcg;
 934
 935         if (grp == NULL) {
 936                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 937                         "%s(%s): No MPC group",
 938                                 CTCM_FUNTAIL, dev->name);
 939                 return;
 940         }
 941
 942         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 943
 944         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 945                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 946                 "read=%i, write=%i\n", __func__, action,
 947                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 948                 grp->active_channels[CTCM_READ],
 949                 grp->active_channels[CTCM_WRITE]);
 950
 951         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 952                 grp->num_channel_paths++;
 953                 grp->active_channels[direction]++;
 954                 grp->outstanding_xid2++;
 955                 ch->in_mpcgroup = 1;
 956
 957                 if (ch->xid_skb != NULL)
 958                         dev_kfree_skb_any(ch->xid_skb);
 959
 960                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 961                                         GFP_ATOMIC | GFP_DMA);
 962                 if (ch->xid_skb == NULL) {
 963                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 964                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 965                                 CTCM_FUNTAIL, dev->name);
 966                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 967                         return;
 968                 }
 969                 ch->xid_skb_data = ch->xid_skb->data;
 970                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 971                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 972                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 973                 skb_put(ch->xid_skb, XID2_LENGTH);
 974                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 975                 ch->xid_skb->data = ch->xid_skb_data;
 976                 skb_reset_tail_pointer(ch->xid_skb);
 977                 ch->xid_skb->len = 0;
 978
 979                 skb_put_data(ch->xid_skb, grp->xid_skb->data,
 980                              grp->xid_skb->len);
 981
 982                 ch->xid->xid2_dlc_type =
 983                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 984                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 985
 986                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 987                         ch->xid->xid2_buf_len = 0x00;
 988
 989                 ch->xid_skb->data = ch->xid_skb_data;
 990                 skb_reset_tail_pointer(ch->xid_skb);
 991                 ch->xid_skb->len = 0;
 992
 993                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 994
 995                 if ((grp->active_channels[CTCM_READ] > 0) &&
 996                     (grp->active_channels[CTCM_WRITE] > 0) &&
 997                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 998                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 999                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1000                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1001                                                 __func__, dev->name);
1002                 }
1003         } else if ((action == MPC_CHANNEL_REMOVE) &&
1004                         (ch->in_mpcgroup == 1)) {
1005                 ch->in_mpcgroup = 0;
1006                 grp->num_channel_paths--;
1007                 grp->active_channels[direction]--;
1008
1009                 if (ch->xid_skb != NULL)
1010                         dev_kfree_skb_any(ch->xid_skb);
1011                 ch->xid_skb = NULL;
1012
1013                 if (grp->channels_terminating)
1014                                         goto done;
1015
1016                 if (((grp->active_channels[CTCM_READ] == 0) &&
1017                                         (grp->active_channels[CTCM_WRITE] > 0))
1018                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1019                                         (grp->active_channels[CTCM_READ] > 0)))
1020                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1021         }
1022 done:
1023         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1024                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1025                 "read=%i, write=%i\n", __func__, action,
1026                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1027                 grp->active_channels[CTCM_READ],
1028                 grp->active_channels[CTCM_WRITE]);
1029
1030         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1031 }
1032
1033 /**
1034  * Unpack a just received skb and hand it over to
1035  * upper layers.
1036  * special MPC version of unpack_skb.
1037  *
1038  * ch           The channel where this skb has been received.
1039  * pskb         The received skb.
1040  */
1041 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1042 {
1043         struct net_device *dev  = ch->netdev;
1044         struct ctcm_priv *priv = dev->ml_priv;
1045         struct mpc_group *grp = priv->mpcg;
1046         struct pdu *curr_pdu;
1047         struct mpcg_info *mpcginfo;
1048         struct th_header *header = NULL;
1049         struct th_sweep *sweep = NULL;
1050         int pdu_last_seen = 0;
1051         __u32 new_len;
1052         struct sk_buff *skb;
1053         int skblen;
1054         int sendrc = 0;
1055
1056         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1057                         __func__, dev->name, smp_processor_id(), ch->id);
1058
1059         header = (struct th_header *)pskb->data;
1060         if ((header->th_seg == 0) &&
1061                 (header->th_ch_flag == 0) &&
1062                 (header->th_blk_flag == 0) &&
1063                 (header->th_seq_num == 0))
1064                 /* nothing for us */    goto done;
1065
1066         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1067         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1068         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1069
1070         pskb->dev = dev;
1071         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1072         skb_pull(pskb, TH_HEADER_LENGTH);
1073
1074         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1075                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1076                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1077                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1078                     (header->th_seq_num != ch->th_seq_num + 1) &&
1079                     (ch->th_seq_num != 0))) {
1080                         /* This is NOT the next segment         *
1081                          * we are not the correct race winner   *
1082                          * go away and let someone else win     *
1083                          * BUT..this only applies if xid negot  *
1084                          * is done                              *
1085                         */
1086                         grp->out_of_sequence += 1;
1087                         __skb_push(pskb, TH_HEADER_LENGTH);
1088                         skb_queue_tail(&ch->io_queue, pskb);
1089                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1090                                         "got:%08x\n", __func__,
1091                                 ch->th_seq_num + 1, header->th_seq_num);
1092
1093                         return;
1094                 }
1095                 grp->out_of_sequence = 0;
1096                 ch->th_seq_num = header->th_seq_num;
1097
1098                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1099                                         __func__, ch->th_seq_num);
1100
1101                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1102                                         goto done;
1103                 while ((pskb->len > 0) && !pdu_last_seen) {
1104                         curr_pdu = (struct pdu *)pskb->data;
1105
1106                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1107                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1108                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1109                                                 __func__, pskb->len);
1110
1111                         skb_pull(pskb, PDU_HEADER_LENGTH);
1112
1113                         if (curr_pdu->pdu_flag & PDU_LAST)
1114                                 pdu_last_seen = 1;
1115                         if (curr_pdu->pdu_flag & PDU_CNTL)
1116                                 pskb->protocol = htons(ETH_P_SNAP);
1117                         else
1118                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1119
1120                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1121                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1122                                         "%s(%s): Dropping packet with "
1123                                         "illegal siize %d",
1124                                         CTCM_FUNTAIL, dev->name, pskb->len);
1125
1126                                 priv->stats.rx_dropped++;
1127                                 priv->stats.rx_length_errors++;
1128                                         goto done;
1129                         }
1130                         skb_reset_mac_header(pskb);
1131                         new_len = curr_pdu->pdu_offset;
1132                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1133                                                 __func__, new_len);
1134                         if ((new_len == 0) || (new_len > pskb->len)) {
1135                                 /* should never happen              */
1136                                 /* pskb len must be hosed...bail out */
1137                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1138                                         "%s(%s): non valid pdu_offset: %04x",
1139                                         /* "data may be lost", */
1140                                         CTCM_FUNTAIL, dev->name, new_len);
1141                                 goto done;
1142                         }
1143                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1144
1145                         if (!skb) {
1146                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1147                                         "%s(%s): MEMORY allocation error",
1148                                                 CTCM_FUNTAIL, dev->name);
1149                                 priv->stats.rx_dropped++;
1150                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1151                                                 goto done;
1152                         }
1153                         skb_put_data(skb, pskb->data, new_len);
1154
1155                         skb_reset_mac_header(skb);
1156                         skb->dev = pskb->dev;
1157                         skb->protocol = pskb->protocol;
1158                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1159                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1160                         ch->pdu_seq++;
1161
1162                         if (do_debug_data) {
1163                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1164                                                 __func__, ch->pdu_seq);
1165                                 ctcm_pr_debug("%s: skb:%0lx "
1166                                         "skb len: %d \n", __func__,
1167                                         (unsigned long)skb, skb->len);
1168                                 ctcm_pr_debug("%s: up to 32 bytes "
1169                                         "of pdu_data sent\n", __func__);
1170                                 ctcmpc_dump32((char *)skb->data, skb->len);
1171                         }
1172
1173                         skblen = skb->len;
1174                         sendrc = netif_rx(skb);
1175                         priv->stats.rx_packets++;
1176                         priv->stats.rx_bytes += skblen;
1177                         skb_pull(pskb, new_len); /* point to next PDU */
1178                 }
1179         } else {
1180                 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1181                 if (mpcginfo == NULL)
1182                                         goto done;
1183
1184                 mpcginfo->ch = ch;
1185                 mpcginfo->th = header;
1186                 mpcginfo->skb = pskb;
1187                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1188                                         __func__);
1189                 /*  it's a sweep?   */
1190                 sweep = (struct th_sweep *)pskb->data;
1191                 mpcginfo->sweep = sweep;
1192                 if (header->th_ch_flag == TH_SWEEP_REQ)
1193                         mpc_rcvd_sweep_req(mpcginfo);
1194                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1195                         mpc_rcvd_sweep_resp(mpcginfo);
1196                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1197                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1198                         skb_pull(pskb, XID2_LENGTH);
1199                         mpcginfo->xid = thisxid;
1200                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1201                 } else if (header->th_blk_flag == TH_DISCONTACT)
1202                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1203                 else if (header->th_seq_num != 0) {
1204                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1205                                 "%s(%s): control pkt expected\n",
1206                                                 CTCM_FUNTAIL, dev->name);
1207                         priv->stats.rx_dropped++;
1208                         /* mpcginfo only used for non-data transfers */
1209                         kfree(mpcginfo);
1210                         if (do_debug_data)
1211                                 ctcmpc_dump_skb(pskb, -8);
1212                 }
1213         }
1214 done:
1215
1216         dev_kfree_skb_any(pskb);
1217         if (sendrc == NET_RX_DROP) {
1218                 dev_warn(&dev->dev,
1219                         "The network backlog for %s is exceeded, "
1220                         "package dropped\n", __func__);
1221                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1222         }
1223
1224         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1225                         __func__, dev->name, ch, ch->id);
1226 }
1227
1228 /**
1229  * tasklet helper for mpc's skb unpacking.
1230  *
1231  * ch           The channel to work on.
1232  * Allow flow control back pressure to occur here.
1233  * Throttling back channel can result in excessive
1234  * channel inactivity and system deact of channel
1235  */
1236 void ctcmpc_bh(unsigned long thischan)
1237 {
1238         struct channel    *ch   = (struct channel *)thischan;
1239         struct sk_buff    *skb;
1240         struct net_device *dev  = ch->netdev;
1241         struct ctcm_priv  *priv = dev->ml_priv;
1242         struct mpc_group  *grp  = priv->mpcg;
1243
1244         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1245                dev->name, smp_processor_id(), __func__, ch->id);
1246         /* caller has requested driver to throttle back */
1247         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1248                         (skb = skb_dequeue(&ch->io_queue))) {
1249                 ctcmpc_unpack_skb(ch, skb);
1250                 if (grp->out_of_sequence > 20) {
1251                         /* assume data loss has occurred if */
1252                         /* missing seq_num for extended     */
1253                         /* period of time                   */
1254                         grp->out_of_sequence = 0;
1255                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1256                         break;
1257                 }
1258                 if (skb == skb_peek(&ch->io_queue))
1259                         break;
1260         }
1261         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1262                         __func__, dev->name, ch, ch->id);
1263         return;
1264 }
1265
1266 /*
1267  *  MPC Group Initializations
1268  */
1269 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1270 {
1271         struct mpc_group *grp;
1272
1273         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1274                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1275
1276         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1277         if (grp == NULL)
1278                 return NULL;
1279
1280         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1281                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1282                         mpcg_fsm_len, GFP_KERNEL);
1283         if (grp->fsm == NULL) {
1284                 kfree(grp);
1285                 return NULL;
1286         }
1287
1288         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1289         fsm_settimer(grp->fsm, &grp->timer);
1290
1291         grp->xid_skb =
1292                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1293         if (grp->xid_skb == NULL) {
1294                 kfree_fsm(grp->fsm);
1295                 kfree(grp);
1296                 return NULL;
1297         }
1298         /*  base xid for all channels in group  */
1299         grp->xid_skb_data = grp->xid_skb->data;
1300         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1301         skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1302
1303         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1304         skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1305         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1306         grp->xid->xid2_sender_id = jiffies;
1307
1308         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1309         skb_put_data(grp->xid_skb, "VTAM", 4);
1310
1311         grp->rcvd_xid_skb =
1312                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1313         if (grp->rcvd_xid_skb == NULL) {
1314                 kfree_fsm(grp->fsm);
1315                 dev_kfree_skb(grp->xid_skb);
1316                 kfree(grp);
1317                 return NULL;
1318         }
1319         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1320         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1321         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1322         grp->saved_xid2 = NULL;
1323         priv->xid = grp->xid;
1324         priv->mpcg = grp;
1325         return grp;
1326 }
1327
1328 /*
1329  * The MPC Group Station FSM
1330  */
1331
1332 /*
1333  * MPC Group Station FSM actions
1334  * CTCM_PROTO_MPC only
1335  */
1336
1337 /**
1338  * NOP action for statemachines
1339  */
1340 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1341 {
1342 }
1343
1344 /*
1345  * invoked when the device transitions to dev_stopped
1346  * MPC will stop each individual channel if a single XID failure
1347  * occurs, or will intitiate all channels be stopped if a GROUP
1348  * level failure occurs.
1349  */
1350 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1351 {
1352         struct net_device  *dev = arg;
1353         struct ctcm_priv    *priv;
1354         struct mpc_group *grp;
1355         struct channel *wch;
1356
1357         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1358
1359         priv  = dev->ml_priv;
1360         grp =  priv->mpcg;
1361         grp->flow_off_called = 0;
1362         fsm_deltimer(&grp->timer);
1363         if (grp->channels_terminating)
1364                         return;
1365
1366         grp->channels_terminating = 1;
1367         grp->saved_state = fsm_getstate(grp->fsm);
1368         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1369         if (grp->saved_state > MPCG_STATE_XID7INITF)
1370                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1371                         "%s(%s): MPC GROUP INOPERATIVE",
1372                                 CTCM_FUNTAIL, dev->name);
1373         if ((grp->saved_state != MPCG_STATE_RESET) ||
1374                 /* dealloc_channel has been called */
1375                 (grp->port_persist == 0))
1376                 fsm_deltimer(&priv->restart_timer);
1377
1378         wch = priv->channel[CTCM_WRITE];
1379
1380         switch (grp->saved_state) {
1381         case MPCG_STATE_RESET:
1382         case MPCG_STATE_INOP:
1383         case MPCG_STATE_XID2INITW:
1384         case MPCG_STATE_XID0IOWAIT:
1385         case MPCG_STATE_XID2INITX:
1386         case MPCG_STATE_XID7INITW:
1387         case MPCG_STATE_XID7INITX:
1388         case MPCG_STATE_XID0IOWAIX:
1389         case MPCG_STATE_XID7INITI:
1390         case MPCG_STATE_XID7INITZ:
1391         case MPCG_STATE_XID7INITF:
1392                 break;
1393         case MPCG_STATE_FLOWC:
1394         case MPCG_STATE_READY:
1395         default:
1396                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1397         }
1398
1399         grp->xid2_tgnum = 0;
1400         grp->group_max_buflen = 0;  /*min of all received */
1401         grp->outstanding_xid2 = 0;
1402         grp->outstanding_xid7 = 0;
1403         grp->outstanding_xid7_p2 = 0;
1404         grp->saved_xid2 = NULL;
1405         grp->xidnogood = 0;
1406         grp->changed_side = 0;
1407
1408         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1409         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1410         grp->rcvd_xid_skb->len = 0;
1411         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1412         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1413
1414         if (grp->send_qllc_disc == 1) {
1415                 grp->send_qllc_disc = 0;
1416                 mpc_send_qllc_discontact(dev);
1417         }
1418
1419         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1420         /* This can result in INOP of VTAM PU due to halting of  */
1421         /* outstanding IO which causes a sense to be returned    */
1422         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1423         /* become unreachable without manual intervention        */
1424         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1425                 grp->alloc_called = 0;
1426                 fsm_deltimer(&priv->restart_timer);
1427                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1428                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1429                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1430                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1431                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1432                                         CTCM_FUNTAIL, dev->name);
1433         } else {
1434                 fsm_deltimer(&priv->restart_timer);
1435                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1436                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1437                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1438                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1439                                                 CTCM_FUNTAIL, dev->name);
1440         }
1441 }
1442
1443 /**
1444  * Handle mpc group  action timeout.
1445  * MPC Group Station FSM action
1446  * CTCM_PROTO_MPC only
1447  *
1448  * fi           An instance of an mpc_group fsm.
1449  * event        The event, just happened.
1450  * arg          Generic pointer, casted from net_device * upon call.
1451  */
1452 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1453 {
1454         struct net_device *dev = arg;
1455         struct ctcm_priv *priv;
1456         struct mpc_group *grp;
1457         struct channel *wch;
1458         struct channel *rch;
1459
1460         priv = dev->ml_priv;
1461         grp = priv->mpcg;
1462         wch = priv->channel[CTCM_WRITE];
1463         rch = priv->channel[CTCM_READ];
1464
1465         switch (fsm_getstate(grp->fsm)) {
1466         case MPCG_STATE_XID2INITW:
1467                 /* Unless there is outstanding IO on the  */
1468                 /* channel just return and wait for ATTN  */
1469                 /* interrupt to begin XID negotiations    */
1470                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1471                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1472                         break;
1473                 /* Else, fall through */
1474         default:
1475                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1476         }
1477
1478         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1479                         "%s: dev=%s exit",
1480                         CTCM_FUNTAIL, dev->name);
1481         return;
1482 }
1483
1484 /*
1485  * MPC Group Station FSM action
1486  * CTCM_PROTO_MPC only
1487  */
1488 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1489 {
1490         struct mpcg_info   *mpcginfo   = arg;
1491         struct channel     *ch         = mpcginfo->ch;
1492         struct net_device  *dev;
1493         struct ctcm_priv   *priv;
1494         struct mpc_group   *grp;
1495
1496         if (ch) {
1497                 dev = ch->netdev;
1498                 if (dev) {
1499                         priv = dev->ml_priv;
1500                         if (priv) {
1501                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1502                                         "%s: %s: %s\n",
1503                                         CTCM_FUNTAIL, dev->name, ch->id);
1504                                 grp = priv->mpcg;
1505                                 grp->send_qllc_disc = 1;
1506                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1507                         }
1508                 }
1509         }
1510
1511         return;
1512 }
1513
1514 /*
1515  * MPC Group Station - not part of FSM
1516  * CTCM_PROTO_MPC only
1517  * called from add_channel in ctcm_main.c
1518  */
1519 void mpc_action_send_discontact(unsigned long thischan)
1520 {
1521         int rc;
1522         struct channel  *ch = (struct channel *)thischan;
1523         unsigned long   saveflags = 0;
1524
1525         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1526         rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1527         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1528
1529         if (rc != 0) {
1530                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1531         }
1532
1533         return;
1534 }
1535
1536
1537 /*
1538  * helper function of mpc FSM
1539  * CTCM_PROTO_MPC only
1540  * mpc_action_rcvd_xid7
1541 */
1542 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1543 {
1544         struct channel     *ch   = mpcginfo->ch;
1545         struct net_device  *dev  = ch->netdev;
1546         struct ctcm_priv   *priv = dev->ml_priv;
1547         struct mpc_group   *grp  = priv->mpcg;
1548         struct xid2        *xid  = mpcginfo->xid;
1549         int     rc       = 0;
1550         __u64   our_id   = 0;
1551         __u64   their_id = 0;
1552         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1553
1554         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1555
1556         if (xid == NULL) {
1557                 rc = 1;
1558                 /* XID REJECTED: xid == NULL */
1559                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1560                         "%s(%s): xid = NULL",
1561                                 CTCM_FUNTAIL, ch->id);
1562                         goto done;
1563         }
1564
1565         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1566
1567         /*the received direction should be the opposite of ours  */
1568         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1569                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1570                 rc = 2;
1571                 /* XID REJECTED: r/w channel pairing mismatch */
1572                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1573                         "%s(%s): r/w channel pairing mismatch",
1574                                 CTCM_FUNTAIL, ch->id);
1575                         goto done;
1576         }
1577
1578         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1579                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1580                                 grp->group_max_buflen, xid->xid2_buf_len);
1581
1582                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1583                                                 xid->xid2_buf_len - len)
1584                         grp->group_max_buflen = xid->xid2_buf_len - len;
1585         }
1586
1587         if (grp->saved_xid2 == NULL) {
1588                 grp->saved_xid2 =
1589                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1590
1591                 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1592                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1593
1594                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1595                 grp->rcvd_xid_skb->len = 0;
1596
1597                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1598                 our_id = (__u64)priv->xid->xid2_adj_id;
1599                 our_id = our_id << 32;
1600                 our_id = our_id + priv->xid->xid2_sender_id;
1601                 their_id = (__u64)xid->xid2_adj_id;
1602                 their_id = their_id << 32;
1603                 their_id = their_id + xid->xid2_sender_id;
1604                 /* lower id assume the xside role */
1605                 if (our_id < their_id) {
1606                         grp->roll = XSIDE;
1607                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1608                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1609                                         CTCM_FUNTAIL, ch->id);
1610                 } else {
1611                         grp->roll = YSIDE;
1612                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1613                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1614                                         CTCM_FUNTAIL, ch->id);
1615                 }
1616
1617         } else {
1618                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1619                         rc = 3;
1620                         /* XID REJECTED: xid flag byte4 mismatch */
1621                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1622                                 "%s(%s): xid flag byte4 mismatch",
1623                                         CTCM_FUNTAIL, ch->id);
1624                 }
1625                 if (xid->xid2_flag2 == 0x40) {
1626                         rc = 4;
1627                         /* XID REJECTED - xid NOGOOD */
1628                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1629                                 "%s(%s): xid NOGOOD",
1630                                         CTCM_FUNTAIL, ch->id);
1631                 }
1632                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1633                         rc = 5;
1634                         /* XID REJECTED - Adjacent Station ID Mismatch */
1635                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1636                                 "%s(%s): Adjacent Station ID Mismatch",
1637                                         CTCM_FUNTAIL, ch->id);
1638                 }
1639                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1640                         rc = 6;
1641                         /* XID REJECTED - Sender Address Mismatch */
1642                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1643                                 "%s(%s): Sender Address Mismatch",
1644                                         CTCM_FUNTAIL, ch->id);
1645                 }
1646         }
1647 done:
1648         if (rc) {
1649                 dev_warn(&dev->dev,
1650                         "The XID used in the MPC protocol is not valid, "
1651                         "rc = %d\n", rc);
1652                 priv->xid->xid2_flag2 = 0x40;
1653                 grp->saved_xid2->xid2_flag2 = 0x40;
1654         }
1655
1656         return rc;
1657 }
1658
1659 /*
1660  * MPC Group Station FSM action
1661  * CTCM_PROTO_MPC only
1662  */
1663 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1664 {
1665         struct channel *ch = arg;
1666         int rc = 0;
1667         int gotlock = 0;
1668         unsigned long saveflags = 0;    /* avoids compiler warning with
1669                                            spin_unlock_irqrestore */
1670
1671         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1672                         __func__, smp_processor_id(), ch, ch->id);
1673
1674         if (ctcm_checkalloc_buffer(ch))
1675                                         goto done;
1676
1677         /*
1678          * skb data-buffer referencing:
1679          */
1680         ch->trans_skb->data = ch->trans_skb_data;
1681         skb_reset_tail_pointer(ch->trans_skb);
1682         ch->trans_skb->len = 0;
1683         /* result of the previous 3 statements is NOT always
1684          * already set after ctcm_checkalloc_buffer
1685          * because of possible reuse of the trans_skb
1686          */
1687         memset(ch->trans_skb->data, 0, 16);
1688         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1689         /* check is main purpose here: */
1690         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1691         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1692         /* check is main purpose here: */
1693         skb_put(ch->trans_skb, XID2_LENGTH);
1694         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1695         /* cleanup back to startpoint */
1696         ch->trans_skb->data = ch->trans_skb_data;
1697         skb_reset_tail_pointer(ch->trans_skb);
1698         ch->trans_skb->len = 0;
1699
1700         /* non-checking rewrite of above skb data-buffer referencing: */
1701         /*
1702         memset(ch->trans_skb->data, 0, 16);
1703         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1704         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1705         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1706          */
1707
1708         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1709         ch->ccw[8].count        = 0;
1710         ch->ccw[8].cda          = 0x00;
1711
1712         if (!(ch->xid_th && ch->xid && ch->xid_id))
1713                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1714                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1715                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1716
1717         if (side == XSIDE) {
1718                 /* mpc_action_xside_xid */
1719                 if (ch->xid_th == NULL)
1720                                 goto done;
1721                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1722                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1723                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1724                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1725
1726                 if (ch->xid == NULL)
1727                                 goto done;
1728                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1729                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1730                 ch->ccw[10].count       = XID2_LENGTH;
1731                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1732
1733                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1734                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1735                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1736                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1737
1738                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1739                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1740                 ch->ccw[12].count       = XID2_LENGTH;
1741                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1742
1743                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1744                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1745
1746         } else { /* side == YSIDE : mpc_action_yside_xid */
1747                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1748                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1749                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1750                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1751
1752                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1753                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1754                 ch->ccw[10].count       = XID2_LENGTH;
1755                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1756
1757                 if (ch->xid_th == NULL)
1758                                 goto done;
1759                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1760                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1761                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1762                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1763
1764                 if (ch->xid == NULL)
1765                                 goto done;
1766                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1767                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1768                 ch->ccw[12].count       = XID2_LENGTH;
1769                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1770
1771                 if (ch->xid_id == NULL)
1772                                 goto done;
1773                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1774                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1775
1776         }
1777         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1778         ch->ccw[13].count       = 4;
1779
1780         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1781         ch->ccw[14].flags       = CCW_FLAG_SLI;
1782         ch->ccw[14].count       = 0;
1783         ch->ccw[14].cda         = 0;
1784
1785         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1786         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1787         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1788         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1789
1790         if (!in_irq()) {
1791                          /* Such conditional locking is a known problem for
1792                           * sparse because its static undeterministic.
1793                           * Warnings should be ignored here. */
1794                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1795                 gotlock = 1;
1796         }
1797
1798         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1799         rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1800
1801         if (gotlock)    /* see remark above about conditional locking */
1802                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1803
1804         if (rc != 0) {
1805                 ctcm_ccw_check_rc(ch, rc,
1806                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1807         }
1808
1809 done:
1810         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1811                                 __func__, ch, ch->id);
1812         return;
1813
1814 }
1815
1816 /*
1817  * MPC Group Station FSM action
1818  * CTCM_PROTO_MPC only
1819  */
1820 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1821 {
1822         mpc_action_side_xid(fsm, arg, XSIDE);
1823 }
1824
1825 /*
1826  * MPC Group Station FSM action
1827  * CTCM_PROTO_MPC only
1828  */
1829 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1830 {
1831         mpc_action_side_xid(fsm, arg, YSIDE);
1832 }
1833
1834 /*
1835  * MPC Group Station FSM action
1836  * CTCM_PROTO_MPC only
1837  */
1838 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1839 {
1840         struct channel     *ch   = arg;
1841         struct net_device  *dev  = ch->netdev;
1842         struct ctcm_priv   *priv = dev->ml_priv;
1843         struct mpc_group   *grp  = priv->mpcg;
1844
1845         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1846                         __func__, smp_processor_id(), ch, ch->id);
1847
1848         if (ch->xid == NULL) {
1849                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1850                         "%s(%s): ch->xid == NULL",
1851                                 CTCM_FUNTAIL, dev->name);
1852                 return;
1853         }
1854
1855         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1856
1857         ch->xid->xid2_option =  XID2_0;
1858
1859         switch (fsm_getstate(grp->fsm)) {
1860         case MPCG_STATE_XID2INITW:
1861         case MPCG_STATE_XID2INITX:
1862                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1863                 break;
1864         case MPCG_STATE_XID0IOWAIT:
1865         case MPCG_STATE_XID0IOWAIX:
1866                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1867                 break;
1868         }
1869
1870         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1871
1872         return;
1873 }
1874
1875 /*
1876  * MPC Group Station FSM action
1877  * CTCM_PROTO_MPC only
1878 */
1879 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1880 {
1881         struct net_device *dev = arg;
1882         struct ctcm_priv  *priv = dev->ml_priv;
1883         struct mpc_group  *grp  = NULL;
1884         int direction;
1885         int send = 0;
1886
1887         if (priv)
1888                 grp = priv->mpcg;
1889         if (grp == NULL)
1890                 return;
1891
1892         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1893                 struct channel *ch = priv->channel[direction];
1894                 struct xid2 *thisxid = ch->xid;
1895                 ch->xid_skb->data = ch->xid_skb_data;
1896                 skb_reset_tail_pointer(ch->xid_skb);
1897                 ch->xid_skb->len = 0;
1898                 thisxid->xid2_option = XID2_7;
1899                 send = 0;
1900
1901                 /* xid7 phase 1 */
1902                 if (grp->outstanding_xid7_p2 > 0) {
1903                         if (grp->roll == YSIDE) {
1904                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1905                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1906                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1907                                         skb_put_data(ch->xid_skb, &thdummy,
1908                                                      TH_HEADER_LENGTH);
1909                                         send = 1;
1910                                 }
1911                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1912                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1913                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1914                                         skb_put_data(ch->xid_skb, &thnorm,
1915                                                      TH_HEADER_LENGTH);
1916                                         send = 1;
1917                         }
1918                 } else {
1919                         /* xid7 phase 2 */
1920                         if (grp->roll == YSIDE) {
1921                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1922                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1923                                         skb_put_data(ch->xid_skb, &thnorm,
1924                                                      TH_HEADER_LENGTH);
1925                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1926                                         send = 1;
1927                                 }
1928                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1929                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1930                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1931                                 skb_put_data(ch->xid_skb, &thdummy,
1932                                              TH_HEADER_LENGTH);
1933                                 send = 1;
1934                         }
1935                 }
1936
1937                 if (send)
1938                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1939         }
1940
1941         return;
1942 }
1943
1944 /*
1945  * MPC Group Station FSM action
1946  * CTCM_PROTO_MPC only
1947  */
1948 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1949 {
1950
1951         struct mpcg_info   *mpcginfo  = arg;
1952         struct channel     *ch   = mpcginfo->ch;
1953         struct net_device  *dev  = ch->netdev;
1954         struct ctcm_priv   *priv = dev->ml_priv;
1955         struct mpc_group   *grp  = priv->mpcg;
1956
1957         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1958                         __func__, ch->id, grp->outstanding_xid2,
1959                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1960
1961         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1962                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1963
1964         grp->outstanding_xid2--;
1965         grp->outstanding_xid7++;
1966         grp->outstanding_xid7_p2++;
1967
1968         /* must change state before validating xid to */
1969         /* properly handle interim interrupts received*/
1970         switch (fsm_getstate(grp->fsm)) {
1971         case MPCG_STATE_XID2INITW:
1972                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1973                 mpc_validate_xid(mpcginfo);
1974                 break;
1975         case MPCG_STATE_XID0IOWAIT:
1976                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1977                 mpc_validate_xid(mpcginfo);
1978                 break;
1979         case MPCG_STATE_XID2INITX:
1980                 if (grp->outstanding_xid2 == 0) {
1981                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1982                         mpc_validate_xid(mpcginfo);
1983                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1984                 }
1985                 break;
1986         case MPCG_STATE_XID0IOWAIX:
1987                 if (grp->outstanding_xid2 == 0) {
1988                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1989                         mpc_validate_xid(mpcginfo);
1990                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991                 }
1992                 break;
1993         }
1994         kfree(mpcginfo);
1995
1996         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1997                 __func__, ch->id, grp->outstanding_xid2,
1998                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1999         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2000                 __func__, ch->id,
2001                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2002         return;
2003
2004 }
2005
2006
2007 /*
2008  * MPC Group Station FSM action
2009  * CTCM_PROTO_MPC only
2010  */
2011 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2012 {
2013         struct mpcg_info   *mpcginfo   = arg;
2014         struct channel     *ch         = mpcginfo->ch;
2015         struct net_device  *dev        = ch->netdev;
2016         struct ctcm_priv   *priv    = dev->ml_priv;
2017         struct mpc_group   *grp     = priv->mpcg;
2018
2019         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2020                 __func__, smp_processor_id(), ch, ch->id);
2021         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2022                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2023
2024         grp->outstanding_xid7--;
2025         ch->xid_skb->data = ch->xid_skb_data;
2026         skb_reset_tail_pointer(ch->xid_skb);
2027         ch->xid_skb->len = 0;
2028
2029         switch (fsm_getstate(grp->fsm)) {
2030         case MPCG_STATE_XID7INITI:
2031                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2032                 mpc_validate_xid(mpcginfo);
2033                 break;
2034         case MPCG_STATE_XID7INITW:
2035                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2036                 mpc_validate_xid(mpcginfo);
2037                 break;
2038         case MPCG_STATE_XID7INITZ:
2039         case MPCG_STATE_XID7INITX:
2040                 if (grp->outstanding_xid7 == 0) {
2041                         if (grp->outstanding_xid7_p2 > 0) {
2042                                 grp->outstanding_xid7 =
2043                                         grp->outstanding_xid7_p2;
2044                                 grp->outstanding_xid7_p2 = 0;
2045                         } else
2046                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2047
2048                         mpc_validate_xid(mpcginfo);
2049                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2050                         break;
2051                 }
2052                 mpc_validate_xid(mpcginfo);
2053                 break;
2054         }
2055         kfree(mpcginfo);
2056         return;
2057 }
2058
2059 /*
2060  * mpc_action helper of an MPC Group Station FSM action
2061  * CTCM_PROTO_MPC only
2062  */
2063 static int mpc_send_qllc_discontact(struct net_device *dev)
2064 {
2065         __u32   new_len = 0;
2066         struct sk_buff   *skb;
2067         struct qllc      *qllcptr;
2068         struct ctcm_priv *priv = dev->ml_priv;
2069         struct mpc_group *grp = priv->mpcg;
2070
2071         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2072                 __func__, mpcg_state_names[grp->saved_state]);
2073
2074         switch (grp->saved_state) {
2075         /*
2076          * establish conn callback function is
2077          * preferred method to report failure
2078          */
2079         case MPCG_STATE_XID0IOWAIT:
2080         case MPCG_STATE_XID0IOWAIX:
2081         case MPCG_STATE_XID7INITI:
2082         case MPCG_STATE_XID7INITZ:
2083         case MPCG_STATE_XID2INITW:
2084         case MPCG_STATE_XID2INITX:
2085         case MPCG_STATE_XID7INITW:
2086         case MPCG_STATE_XID7INITX:
2087                 if (grp->estconnfunc) {
2088                         grp->estconnfunc(grp->port_num, -1, 0);
2089                         grp->estconnfunc = NULL;
2090                         break;
2091                 }
2092                 /* Else, fall through */
2093         case MPCG_STATE_FLOWC:
2094         case MPCG_STATE_READY:
2095                 grp->send_qllc_disc = 2;
2096                 new_len = sizeof(struct qllc);
2097                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2098                 if (qllcptr == NULL) {
2099                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2100                                 "%s(%s): qllcptr allocation error",
2101                                                 CTCM_FUNTAIL, dev->name);
2102                         return -ENOMEM;
2103                 }
2104
2105                 qllcptr->qllc_address = 0xcc;
2106                 qllcptr->qllc_commands = 0x03;
2107
2108                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2109
2110                 if (skb == NULL) {
2111                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2112                                 "%s(%s): skb allocation error",
2113                                                 CTCM_FUNTAIL, dev->name);
2114                         priv->stats.rx_dropped++;
2115                         kfree(qllcptr);
2116                         return -ENOMEM;
2117                 }
2118
2119                 skb_put_data(skb, qllcptr, new_len);
2120                 kfree(qllcptr);
2121
2122                 if (skb_headroom(skb) < 4) {
2123                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2124                                 "%s(%s): skb_headroom error",
2125                                                 CTCM_FUNTAIL, dev->name);
2126                         dev_kfree_skb_any(skb);
2127                         return -ENOMEM;
2128                 }
2129
2130                 *((__u32 *)skb_push(skb, 4)) =
2131                         priv->channel[CTCM_READ]->pdu_seq;
2132                 priv->channel[CTCM_READ]->pdu_seq++;
2133                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2134                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2135
2136                 /* receipt of CC03 resets anticipated sequence number on
2137                       receiving side */
2138                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2139                 skb_reset_mac_header(skb);
2140                 skb->dev = dev;
2141                 skb->protocol = htons(ETH_P_SNAP);
2142                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2143
2144                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2145
2146                 netif_rx(skb);
2147                 break;
2148         default:
2149                 break;
2150
2151         }
2152
2153         return 0;
2154 }
2155 /* --- This is the END my friend --- */
2156