drivers/s390/net/ctcm_mpc.c

   1 /*
   2  *      drivers/s390/net/ctcm_mpc.c
   3  *
   4  *      Copyright IBM Corp. 2004, 2007
   5  *      Authors:        Belinda Thompson (belindat@us.ibm.com)
   6  *                      Andy Richter (richtera@us.ibm.com)
   7  *                      Peter Tiedemann (ptiedem@de.ibm.com)
   8  */
   9
  10 /*
  11         This module exports functions to be used by CCS:
  12         EXPORT_SYMBOL(ctc_mpc_alloc_channel);
  13         EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
  14         EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
  15         EXPORT_SYMBOL(ctc_mpc_flow_control);
  16 */
  17
  18 #undef DEBUG
  19 #undef DEBUGDATA
  20 #undef DEBUGCCW
  21
  22 #define KMSG_COMPONENT "ctcm"
  23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/timer.h>
  33 #include <linux/sched.h>
  34
  35 #include <linux/signal.h>
  36 #include <linux/string.h>
  37 #include <linux/proc_fs.h>
  38
  39 #include <linux/ip.h>
  40 #include <linux/if_arp.h>
  41 #include <linux/tcp.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/ctype.h>
  44 #include <linux/netdevice.h>
  45 #include <net/dst.h>
  46
  47 #include <linux/io.h>           /* instead of <asm/io.h> ok ? */
  48 #include <asm/ccwdev.h>
  49 #include <asm/ccwgroup.h>
  50 #include <linux/bitops.h>       /* instead of <asm/bitops.h> ok ? */
  51 #include <linux/uaccess.h>      /* instead of <asm/uaccess.h> ok ? */
  52 #include <linux/wait.h>
  53 #include <linux/moduleparam.h>
  54 #include <asm/idals.h>
  55
  56 #include "ctcm_mpc.h"
  57 #include "ctcm_main.h"
  58 #include "ctcm_fsms.h"
  59
  60 static const struct xid2 init_xid = {
  61         .xid2_type_id   =       XID_FM2,
  62         .xid2_len       =       0x45,
  63         .xid2_adj_id    =       0,
  64         .xid2_rlen      =       0x31,
  65         .xid2_resv1     =       0,
  66         .xid2_flag1     =       0,
  67         .xid2_fmtt      =       0,
  68         .xid2_flag4     =       0x80,
  69         .xid2_resv2     =       0,
  70         .xid2_tgnum     =       0,
  71         .xid2_sender_id =       0,
  72         .xid2_flag2     =       0,
  73         .xid2_option    =       XID2_0,
  74         .xid2_resv3     =       "\x00",
  75         .xid2_resv4     =       0,
  76         .xid2_dlc_type  =       XID2_READ_SIDE,
  77         .xid2_resv5     =       0,
  78         .xid2_mpc_flag  =       0,
  79         .xid2_resv6     =       0,
  80         .xid2_buf_len   =       (MPC_BUFSIZE_DEFAULT - 35),
  81 };
  82
  83 static const struct th_header thnorm = {
  84         .th_seg         =       0x00,
  85         .th_ch_flag     =       TH_IS_XID,
  86         .th_blk_flag    =       TH_DATA_IS_XID,
  87         .th_is_xid      =       0x01,
  88         .th_seq_num     =       0x00000000,
  89 };
  90
  91 static const struct th_header thdummy = {
  92         .th_seg         =       0x00,
  93         .th_ch_flag     =       0x00,
  94         .th_blk_flag    =       TH_DATA_IS_XID,
  95         .th_is_xid      =       0x01,
  96         .th_seq_num     =       0x00000000,
  97 };
  98
  99 /*
 100  * Definition of one MPC group
 101  */
 102
 103 /*
 104  * Compatibility macros for busy handling
 105  * of network devices.
 106  */
 107
 108 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 109
 110 /*
 111  * MPC Group state machine actions (static prototypes)
 112  */
 113 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
 114 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
 115 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
 116 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
 117 static int  mpc_validate_xid(struct mpcg_info *mpcginfo);
 118 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
 119 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
 120 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
 121 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
 122 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
 123 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
 124
 125 #ifdef DEBUGDATA
 126 /*-------------------------------------------------------------------*
 127 * Dump buffer format                                                 *
 128 *                                                                    *
 129 *--------------------------------------------------------------------*/
 130 void ctcmpc_dumpit(char *buf, int len)
 131 {
 132         __u32   ct, sw, rm, dup;
 133         char    *ptr, *rptr;
 134         char    tbuf[82], tdup[82];
 135         #if (UTS_MACHINE == s390x)
 136         char    addr[22];
 137         #else
 138         char    addr[12];
 139         #endif
 140         char    boff[12];
 141         char    bhex[82], duphex[82];
 142         char    basc[40];
 143
 144         sw  = 0;
 145         rptr = ptr = buf;
 146         rm  = 16;
 147         duphex[0] = 0x00;
 148         dup = 0;
 149
 150         for (ct = 0; ct < len; ct++, ptr++, rptr++) {
 151                 if (sw == 0) {
 152                         #if (UTS_MACHINE == s390x)
 153                         sprintf(addr, "%16.16lx", (__u64)rptr);
 154                         #else
 155                         sprintf(addr, "%8.8X", (__u32)rptr);
 156                         #endif
 157
 158                         sprintf(boff, "%4.4X", (__u32)ct);
 159                         bhex[0] = '\0';
 160                         basc[0] = '\0';
 161                 }
 162                 if ((sw == 4) || (sw == 12))
 163                         strcat(bhex, " ");
 164                 if (sw == 8)
 165                         strcat(bhex, "  ");
 166
 167                 #if (UTS_MACHINE == s390x)
 168                 sprintf(tbuf, "%2.2lX", (__u64)*ptr);
 169                 #else
 170                 sprintf(tbuf, "%2.2X", (__u32)*ptr);
 171                 #endif
 172
 173                 tbuf[2] = '\0';
 174                 strcat(bhex, tbuf);
 175                 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
 176                         basc[sw] = *ptr;
 177                 else
 178                         basc[sw] = '.';
 179
 180                 basc[sw+1] = '\0';
 181                 sw++;
 182                 rm--;
 183                 if (sw != 16)
 184                         continue;
 185                 if ((strcmp(duphex, bhex)) != 0) {
 186                         if (dup != 0) {
 187                                 sprintf(tdup,
 188                                         "Duplicate as above to %s", addr);
 189                                 ctcm_pr_debug("                --- %s ---\n",
 190                                                 tdup);
 191                         }
 192                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 193                                         addr, boff, bhex, basc);
 194                         dup = 0;
 195                         strcpy(duphex, bhex);
 196                 } else
 197                         dup++;
 198
 199                 sw = 0;
 200                 rm = 16;
 201         }  /* endfor */
 202
 203         if (sw != 0) {
 204                 for ( ; rm > 0; rm--, sw++) {
 205                         if ((sw == 4) || (sw == 12))
 206                                 strcat(bhex, " ");
 207                         if (sw == 8)
 208                                 strcat(bhex, "  ");
 209                         strcat(bhex, "  ");
 210                         strcat(basc, " ");
 211                 }
 212                 if (dup != 0) {
 213                         sprintf(tdup, "Duplicate as above to %s", addr);
 214                         ctcm_pr_debug("                --- %s ---\n", tdup);
 215                 }
 216                 ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 217                                         addr, boff, bhex, basc);
 218         } else {
 219                 if (dup >= 1) {
 220                         sprintf(tdup, "Duplicate as above to %s", addr);
 221                         ctcm_pr_debug("                --- %s ---\n", tdup);
 222                 }
 223                 if (dup != 0) {
 224                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 225                                 addr, boff, bhex, basc);
 226                 }
 227         }
 228
 229         return;
 230
 231 }   /*   end of ctcmpc_dumpit  */
 232 #endif
 233
 234 #ifdef DEBUGDATA
 235 /*
 236  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 237  *
 238  * skb          The sk_buff to dump.
 239  * offset       Offset relative to skb-data, where to start the dump.
 240  */
 241 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
 242 {
 243         __u8 *p = skb->data;
 244         struct th_header *header;
 245         struct pdu *pheader;
 246         int bl = skb->len;
 247         int i;
 248
 249         if (p == NULL)
 250                 return;
 251
 252         p += offset;
 253         header = (struct th_header *)p;
 254
 255         ctcm_pr_debug("dump:\n");
 256         ctcm_pr_debug("skb len=%d \n", skb->len);
 257         if (skb->len > 2) {
 258                 switch (header->th_ch_flag) {
 259                 case TH_HAS_PDU:
 260                         break;
 261                 case 0x00:
 262                 case TH_IS_XID:
 263                         if ((header->th_blk_flag == TH_DATA_IS_XID) &&
 264                            (header->th_is_xid == 0x01))
 265                                 goto dumpth;
 266                 case TH_SWEEP_REQ:
 267                                 goto dumpth;
 268                 case TH_SWEEP_RESP:
 269                                 goto dumpth;
 270                 default:
 271                         break;
 272                 }
 273
 274                 pheader = (struct pdu *)p;
 275                 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
 276                                pheader->pdu_offset, pheader->pdu_offset);
 277                 ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
 278                 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
 279                 ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
 280                                         goto dumpdata;
 281
 282 dumpth:
 283                 ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
 284                 ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
 285                 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
 286                 ctcm_pr_debug("th->type    : %s\n",
 287                                (header->th_is_xid) ? "DATA" : "XID");
 288                 ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
 289
 290         }
 291 dumpdata:
 292         if (bl > 32)
 293                 bl = 32;
 294         ctcm_pr_debug("data: ");
 295         for (i = 0; i < bl; i++)
 296                 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
 297         ctcm_pr_debug("\n");
 298 }
 299 #endif
 300
 301 static struct net_device *ctcmpc_get_dev(int port_num)
 302 {
 303         char device[20];
 304         struct net_device *dev;
 305         struct ctcm_priv *priv;
 306
 307         sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
 308
 309         dev = __dev_get_by_name(&init_net, device);
 310
 311         if (dev == NULL) {
 312                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 313                         "%s: Device not found by name: %s",
 314                                         CTCM_FUNTAIL, device);
 315                 return NULL;
 316         }
 317         priv = dev->ml_priv;
 318         if (priv == NULL) {
 319                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 320                         "%s(%s): dev->ml_priv is NULL",
 321                                         CTCM_FUNTAIL, device);
 322                 return NULL;
 323         }
 324         if (priv->mpcg == NULL) {
 325                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 326                         "%s(%s): priv->mpcg is NULL",
 327                                         CTCM_FUNTAIL, device);
 328                 return NULL;
 329         }
 330         return dev;
 331 }
 332
 333 /*
 334  * ctc_mpc_alloc_channel
 335  *      (exported interface)
 336  *
 337  * Device Initialization :
 338  *      ACTPATH  driven IO operations
 339  */
 340 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
 341 {
 342         struct net_device *dev;
 343         struct mpc_group *grp;
 344         struct ctcm_priv *priv;
 345
 346         dev = ctcmpc_get_dev(port_num);
 347         if (dev == NULL)
 348                 return 1;
 349         priv = dev->ml_priv;
 350         grp = priv->mpcg;
 351
 352         grp->allochanfunc = callback;
 353         grp->port_num = port_num;
 354         grp->port_persist = 1;
 355
 356         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 357                         "%s(%s): state=%s",
 358                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 359
 360         switch (fsm_getstate(grp->fsm)) {
 361         case MPCG_STATE_INOP:
 362                 /* Group is in the process of terminating */
 363                 grp->alloc_called = 1;
 364                 break;
 365         case MPCG_STATE_RESET:
 366                 /* MPC Group will transition to state             */
 367                 /* MPCG_STATE_XID2INITW iff the minimum number    */
 368                 /* of 1 read and 1 write channel have successfully*/
 369                 /* activated                                      */
 370                 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
 371                 if (callback)
 372                         grp->send_qllc_disc = 1;
 373         case MPCG_STATE_XID0IOWAIT:
 374                 fsm_deltimer(&grp->timer);
 375                 grp->outstanding_xid2 = 0;
 376                 grp->outstanding_xid7 = 0;
 377                 grp->outstanding_xid7_p2 = 0;
 378                 grp->saved_xid2 = NULL;
 379                 if (callback)
 380                         ctcm_open(dev);
 381                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 382                 break;
 383         case MPCG_STATE_READY:
 384                 /* XID exchanges completed after PORT was activated */
 385                 /* Link station already active                      */
 386                 /* Maybe timing issue...retry callback              */
 387                 grp->allocchan_callback_retries++;
 388                 if (grp->allocchan_callback_retries < 4) {
 389                         if (grp->allochanfunc)
 390                                 grp->allochanfunc(grp->port_num,
 391                                                   grp->group_max_buflen);
 392                 } else {
 393                         /* there are problems...bail out            */
 394                         /* there may be a state mismatch so restart */
 395                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 396                         grp->allocchan_callback_retries = 0;
 397                 }
 398                 break;
 399         }
 400
 401         return 0;
 402 }
 403 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 404
 405 /*
 406  * ctc_mpc_establish_connectivity
 407  *      (exported interface)
 408  */
 409 void ctc_mpc_establish_connectivity(int port_num,
 410                                 void (*callback)(int, int, int))
 411 {
 412         struct net_device *dev;
 413         struct mpc_group *grp;
 414         struct ctcm_priv *priv;
 415         struct channel *rch, *wch;
 416
 417         dev = ctcmpc_get_dev(port_num);
 418         if (dev == NULL)
 419                 return;
 420         priv = dev->ml_priv;
 421         grp = priv->mpcg;
 422         rch = priv->channel[READ];
 423         wch = priv->channel[WRITE];
 424
 425         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 426                         "%s(%s): state=%s",
 427                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 428
 429         grp->estconnfunc = callback;
 430         grp->port_num = port_num;
 431
 432         switch (fsm_getstate(grp->fsm)) {
 433         case MPCG_STATE_READY:
 434                 /* XID exchanges completed after PORT was activated */
 435                 /* Link station already active                      */
 436                 /* Maybe timing issue...retry callback              */
 437                 fsm_deltimer(&grp->timer);
 438                 grp->estconn_callback_retries++;
 439                 if (grp->estconn_callback_retries < 4) {
 440                         if (grp->estconnfunc) {
 441                                 grp->estconnfunc(grp->port_num, 0,
 442                                                 grp->group_max_buflen);
 443                                 grp->estconnfunc = NULL;
 444                         }
 445                 } else {
 446                         /* there are problems...bail out         */
 447                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 448                         grp->estconn_callback_retries = 0;
 449                 }
 450                 break;
 451         case MPCG_STATE_INOP:
 452         case MPCG_STATE_RESET:
 453                 /* MPC Group is not ready to start XID - min num of */
 454                 /* 1 read and 1 write channel have not been acquired*/
 455
 456                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 457                         "%s(%s): REJECTED - inactive channels",
 458                                         CTCM_FUNTAIL, dev->name);
 459                 if (grp->estconnfunc) {
 460                         grp->estconnfunc(grp->port_num, -1, 0);
 461                         grp->estconnfunc = NULL;
 462                 }
 463                 break;
 464         case MPCG_STATE_XID2INITW:
 465                 /* alloc channel was called but no XID exchange    */
 466                 /* has occurred. initiate xside XID exchange       */
 467                 /* make sure yside XID0 processing has not started */
 468
 469                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 470                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 471                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 472                                 "%s(%s): ABORT - PASSIVE XID",
 473                                         CTCM_FUNTAIL, dev->name);
 474                         break;
 475                 }
 476                 grp->send_qllc_disc = 1;
 477                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 478                 fsm_deltimer(&grp->timer);
 479                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 480                                                 MPCG_EVENT_TIMER, dev);
 481                 grp->outstanding_xid7 = 0;
 482                 grp->outstanding_xid7_p2 = 0;
 483                 grp->saved_xid2 = NULL;
 484                 if ((rch->in_mpcgroup) &&
 485                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 486                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 487                 else {
 488                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 489                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 490                                         CTCM_FUNTAIL, dev->name, rch->id);
 491                         if (grp->estconnfunc) {
 492                                 grp->estconnfunc(grp->port_num, -1, 0);
 493                                 grp->estconnfunc = NULL;
 494                         }
 495                         fsm_deltimer(&grp->timer);
 496                                 goto done;
 497                 }
 498                 if ((wch->in_mpcgroup) &&
 499                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 500                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 501                 else {
 502                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 503                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 504                                         CTCM_FUNTAIL, dev->name, wch->id);
 505                         if (grp->estconnfunc) {
 506                                 grp->estconnfunc(grp->port_num, -1, 0);
 507                                 grp->estconnfunc = NULL;
 508                         }
 509                         fsm_deltimer(&grp->timer);
 510                                 goto done;
 511                         }
 512                 break;
 513         case MPCG_STATE_XID0IOWAIT:
 514                 /* already in active XID negotiations */
 515         default:
 516                 break;
 517         }
 518
 519 done:
 520         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 521         return;
 522 }
 523 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 524
 525 /*
 526  * ctc_mpc_dealloc_ch
 527  *      (exported interface)
 528  */
 529 void ctc_mpc_dealloc_ch(int port_num)
 530 {
 531         struct net_device *dev;
 532         struct ctcm_priv *priv;
 533         struct mpc_group *grp;
 534
 535         dev = ctcmpc_get_dev(port_num);
 536         if (dev == NULL)
 537                 return;
 538         priv = dev->ml_priv;
 539         grp = priv->mpcg;
 540
 541         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 542                         "%s: %s: refcount = %d\n",
 543                         CTCM_FUNTAIL, dev->name, atomic_read(&dev->refcnt));
 544
 545         fsm_deltimer(&priv->restart_timer);
 546         grp->channels_terminating = 0;
 547         fsm_deltimer(&grp->timer);
 548         grp->allochanfunc = NULL;
 549         grp->estconnfunc = NULL;
 550         grp->port_persist = 0;
 551         grp->send_qllc_disc = 0;
 552         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 553
 554         ctcm_close(dev);
 555         return;
 556 }
 557 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 558
 559 /*
 560  * ctc_mpc_flow_control
 561  *      (exported interface)
 562  */
 563 void ctc_mpc_flow_control(int port_num, int flowc)
 564 {
 565         struct ctcm_priv *priv;
 566         struct mpc_group *grp;
 567         struct net_device *dev;
 568         struct channel *rch;
 569         int mpcg_state;
 570
 571         dev = ctcmpc_get_dev(port_num);
 572         if (dev == NULL)
 573                 return;
 574         priv = dev->ml_priv;
 575         grp = priv->mpcg;
 576
 577         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 578                         "%s: %s: flowc = %d",
 579                                 CTCM_FUNTAIL, dev->name, flowc);
 580
 581         rch = priv->channel[READ];
 582
 583         mpcg_state = fsm_getstate(grp->fsm);
 584         switch (flowc) {
 585         case 1:
 586                 if (mpcg_state == MPCG_STATE_FLOWC)
 587                         break;
 588                 if (mpcg_state == MPCG_STATE_READY) {
 589                         if (grp->flow_off_called == 1)
 590                                 grp->flow_off_called = 0;
 591                         else
 592                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 593                         break;
 594                 }
 595                 break;
 596         case 0:
 597                 if (mpcg_state == MPCG_STATE_FLOWC) {
 598                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 599                         /* ensure any data that has accumulated */
 600                         /* on the io_queue will now be sen t    */
 601                         tasklet_schedule(&rch->ch_tasklet);
 602                 }
 603                 /* possible race condition                      */
 604                 if (mpcg_state == MPCG_STATE_READY) {
 605                         grp->flow_off_called = 1;
 606                         break;
 607                 }
 608                 break;
 609         }
 610
 611 }
 612 EXPORT_SYMBOL(ctc_mpc_flow_control);
 613
 614 static int mpc_send_qllc_discontact(struct net_device *);
 615
 616 /*
 617  * helper function of ctcmpc_unpack_skb
 618 */
 619 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 620 {
 621         struct channel    *rch = mpcginfo->ch;
 622         struct net_device *dev = rch->netdev;
 623         struct ctcm_priv   *priv = dev->ml_priv;
 624         struct mpc_group  *grp = priv->mpcg;
 625         struct channel    *ch = priv->channel[WRITE];
 626
 627         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 628         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 629
 630         grp->sweep_rsp_pend_num--;
 631
 632         if ((grp->sweep_req_pend_num == 0) &&
 633                         (grp->sweep_rsp_pend_num == 0)) {
 634                 fsm_deltimer(&ch->sweep_timer);
 635                 grp->in_sweep = 0;
 636                 rch->th_seq_num = 0x00;
 637                 ch->th_seq_num = 0x00;
 638                 ctcm_clear_busy_do(dev);
 639         }
 640
 641         kfree(mpcginfo);
 642
 643         return;
 644
 645 }
 646
 647 /*
 648  * helper function of mpc_rcvd_sweep_req
 649  * which is a helper of ctcmpc_unpack_skb
 650  */
 651 static void ctcmpc_send_sweep_resp(struct channel *rch)
 652 {
 653         struct net_device *dev = rch->netdev;
 654         struct ctcm_priv *priv = dev->ml_priv;
 655         struct mpc_group *grp = priv->mpcg;
 656         int rc = 0;
 657         struct th_sweep *header;
 658         struct sk_buff *sweep_skb;
 659         struct channel *ch  = priv->channel[WRITE];
 660
 661         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 662
 663         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 664         if (sweep_skb == NULL) {
 665                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 666                         "%s(%s): sweep_skb allocation ERROR\n",
 667                         CTCM_FUNTAIL, rch->id);
 668                 rc = -ENOMEM;
 669                                 goto done;
 670         }
 671
 672         header = kmalloc(sizeof(struct th_sweep), gfp_type());
 673
 674         if (!header) {
 675                 dev_kfree_skb_any(sweep_skb);
 676                 rc = -ENOMEM;
 677                                 goto done;
 678         }
 679
 680         header->th.th_seg       = 0x00 ;
 681         header->th.th_ch_flag   = TH_SWEEP_RESP;
 682         header->th.th_blk_flag  = 0x00;
 683         header->th.th_is_xid    = 0x00;
 684         header->th.th_seq_num   = 0x00;
 685         header->sw.th_last_seq  = ch->th_seq_num;
 686
 687         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 688
 689         kfree(header);
 690
 691         dev->trans_start = jiffies;
 692         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 693
 694         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 695
 696         return;
 697
 698 done:
 699         grp->in_sweep = 0;
 700         ctcm_clear_busy_do(dev);
 701         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 702
 703         return;
 704 }
 705
 706 /*
 707  * helper function of ctcmpc_unpack_skb
 708  */
 709 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 710 {
 711         struct channel    *rch     = mpcginfo->ch;
 712         struct net_device *dev     = rch->netdev;
 713         struct ctcm_priv  *priv = dev->ml_priv;
 714         struct mpc_group  *grp  = priv->mpcg;
 715         struct channel    *ch      = priv->channel[WRITE];
 716
 717         if (do_debug)
 718                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 719                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 720
 721         if (grp->in_sweep == 0) {
 722                 grp->in_sweep = 1;
 723                 ctcm_test_and_set_busy(dev);
 724                 grp->sweep_req_pend_num = grp->active_channels[READ];
 725                 grp->sweep_rsp_pend_num = grp->active_channels[READ];
 726         }
 727
 728         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 729
 730         grp->sweep_req_pend_num--;
 731         ctcmpc_send_sweep_resp(ch);
 732         kfree(mpcginfo);
 733         return;
 734 }
 735
 736 /*
 737   * MPC Group Station FSM definitions
 738  */
 739 static const char *mpcg_event_names[] = {
 740         [MPCG_EVENT_INOP]       = "INOP Condition",
 741         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 742         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 743         [MPCG_EVENT_XID2]       = "XID2 Received",
 744         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 745         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 746         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 747         [MPCG_EVENT_DOIO]       = "XID DoIO",
 748 };
 749
 750 static const char *mpcg_state_names[] = {
 751         [MPCG_STATE_RESET]      = "Reset",
 752         [MPCG_STATE_INOP]       = "INOP",
 753         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 754         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 755         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 756         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 757         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 758         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 759         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 760         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 761         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 762         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 763         [MPCG_STATE_READY]      = "READY",
 764 };
 765
 766 /*
 767  * The MPC Group Station FSM
 768  *   22 events
 769  */
 770 static const fsm_node mpcg_fsm[] = {
 771         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 772         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 773         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 774
 775         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 776         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 777
 778         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 779         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 780         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 781         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 782         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 783
 784         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 785         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 786         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 787         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 788         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 789
 790         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 791         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 792         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 793         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 794         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 795         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 796         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 797
 798         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 799         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 800         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 801         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 802         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 803         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 804
 805         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 806         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 807         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 808         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 809         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 810         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 811
 812         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 813         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 814         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 815         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 816         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 817         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 818
 819         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 820         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 821         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 822         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 823         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 824         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 825         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 826
 827         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 828         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 829         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 830         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 831         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 832         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 833
 834         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 835         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 836 };
 837
 838 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 839
 840 /*
 841  * MPC Group Station FSM action
 842  * CTCM_PROTO_MPC only
 843  */
 844 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 845 {
 846         struct net_device *dev = arg;
 847         struct ctcm_priv *priv = dev->ml_priv;
 848         struct mpc_group *grp = priv->mpcg;
 849
 850         if (grp == NULL) {
 851                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 852                         "%s(%s): No MPC group",
 853                                 CTCM_FUNTAIL, dev->name);
 854                 return;
 855         }
 856
 857         fsm_deltimer(&grp->timer);
 858
 859         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 860                 priv->xid->xid2_flag2 = 0x00;
 861                 if (grp->estconnfunc) {
 862                         grp->estconnfunc(grp->port_num, 1,
 863                                         grp->group_max_buflen);
 864                         grp->estconnfunc = NULL;
 865                 } else if (grp->allochanfunc)
 866                         grp->send_qllc_disc = 1;
 867
 868                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 869                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 870                                 "%s(%s): fails",
 871                                         CTCM_FUNTAIL, dev->name);
 872                 return;
 873         }
 874
 875         grp->port_persist = 1;
 876         grp->out_of_sequence = 0;
 877         grp->estconn_called = 0;
 878
 879         tasklet_hi_schedule(&grp->mpc_tasklet2);
 880
 881         return;
 882 }
 883
 884 /*
 885  * helper of ctcm_init_netdevice
 886  * CTCM_PROTO_MPC only
 887  */
 888 void mpc_group_ready(unsigned long adev)
 889 {
 890         struct net_device *dev = (struct net_device *)adev;
 891         struct ctcm_priv *priv = dev->ml_priv;
 892         struct mpc_group *grp = priv->mpcg;
 893         struct channel *ch = NULL;
 894
 895         if (grp == NULL) {
 896                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 897                         "%s(%s): No MPC group",
 898                                 CTCM_FUNTAIL, dev->name);
 899                 return;
 900         }
 901
 902         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 903                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 904                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 905
 906         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 907
 908         /* Put up a read on the channel */
 909         ch = priv->channel[READ];
 910         ch->pdu_seq = 0;
 911         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 912                         __func__, ch->pdu_seq);
 913
 914         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 915         /* Put the write channel in idle state */
 916         ch = priv->channel[WRITE];
 917         if (ch->collect_len > 0) {
 918                 spin_lock(&ch->collect_lock);
 919                 ctcm_purge_skb_queue(&ch->collect_queue);
 920                 ch->collect_len = 0;
 921                 spin_unlock(&ch->collect_lock);
 922         }
 923         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 924         ctcm_clear_busy(dev);
 925
 926         if (grp->estconnfunc) {
 927                 grp->estconnfunc(grp->port_num, 0,
 928                                     grp->group_max_buflen);
 929                 grp->estconnfunc = NULL;
 930         } else  if (grp->allochanfunc)
 931                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 932
 933         grp->send_qllc_disc = 1;
 934         grp->changed_side = 0;
 935
 936         return;
 937
 938 }
 939
 940 /*
 941  * Increment the MPC Group Active Channel Counts
 942  * helper of dev_action (called from channel fsm)
 943  */
 944 void mpc_channel_action(struct channel *ch, int direction, int action)
 945 {
 946         struct net_device  *dev  = ch->netdev;
 947         struct ctcm_priv   *priv = dev->ml_priv;
 948         struct mpc_group   *grp  = priv->mpcg;
 949
 950         if (grp == NULL) {
 951                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 952                         "%s(%s): No MPC group",
 953                                 CTCM_FUNTAIL, dev->name);
 954                 return;
 955         }
 956
 957         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 958
 959         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 960                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 961                 "read=%i, write=%i\n", __func__, action,
 962                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 963                 grp->active_channels[READ], grp->active_channels[WRITE]);
 964
 965         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 966                 grp->num_channel_paths++;
 967                 grp->active_channels[direction]++;
 968                 grp->outstanding_xid2++;
 969                 ch->in_mpcgroup = 1;
 970
 971                 if (ch->xid_skb != NULL)
 972                         dev_kfree_skb_any(ch->xid_skb);
 973
 974                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 975                                         GFP_ATOMIC | GFP_DMA);
 976                 if (ch->xid_skb == NULL) {
 977                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 978                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 979                                 CTCM_FUNTAIL, dev->name);
 980                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 981                         return;
 982                 }
 983                 ch->xid_skb_data = ch->xid_skb->data;
 984                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 985                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 986                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 987                 skb_put(ch->xid_skb, XID2_LENGTH);
 988                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 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                 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
 994                                 grp->xid_skb->data,
 995                                 grp->xid_skb->len);
 996
 997                 ch->xid->xid2_dlc_type = ((CHANNEL_DIRECTION(ch->flags) == READ)
 998                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 999
1000                 if (CHANNEL_DIRECTION(ch->flags) == WRITE)
1001                         ch->xid->xid2_buf_len = 0x00;
1002
1003                 ch->xid_skb->data = ch->xid_skb_data;
1004                 skb_reset_tail_pointer(ch->xid_skb);
1005                 ch->xid_skb->len = 0;
1006
1007                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
1008
1009                 if ((grp->active_channels[READ]  > 0) &&
1010                     (grp->active_channels[WRITE] > 0) &&
1011                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
1012                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
1013                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
1014                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1015                                                 __func__, dev->name);
1016                 }
1017         } else if ((action == MPC_CHANNEL_REMOVE) &&
1018                         (ch->in_mpcgroup == 1)) {
1019                 ch->in_mpcgroup = 0;
1020                 grp->num_channel_paths--;
1021                 grp->active_channels[direction]--;
1022
1023                 if (ch->xid_skb != NULL)
1024                         dev_kfree_skb_any(ch->xid_skb);
1025                 ch->xid_skb = NULL;
1026
1027                 if (grp->channels_terminating)
1028                                         goto done;
1029
1030                 if (((grp->active_channels[READ] == 0) &&
1031                                         (grp->active_channels[WRITE] > 0))
1032                         || ((grp->active_channels[WRITE] == 0) &&
1033                                         (grp->active_channels[READ] > 0)))
1034                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1035         }
1036 done:
1037         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1038                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1039                 "read=%i, write=%i\n", __func__, action,
1040                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1041                 grp->active_channels[READ], grp->active_channels[WRITE]);
1042
1043         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1044 }
1045
1046 /**
1047  * Unpack a just received skb and hand it over to
1048  * upper layers.
1049  * special MPC version of unpack_skb.
1050  *
1051  * ch           The channel where this skb has been received.
1052  * pskb         The received skb.
1053  */
1054 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1055 {
1056         struct net_device *dev  = ch->netdev;
1057         struct ctcm_priv *priv = dev->ml_priv;
1058         struct mpc_group *grp = priv->mpcg;
1059         struct pdu *curr_pdu;
1060         struct mpcg_info *mpcginfo;
1061         struct th_header *header = NULL;
1062         struct th_sweep *sweep = NULL;
1063         int pdu_last_seen = 0;
1064         __u32 new_len;
1065         struct sk_buff *skb;
1066         int skblen;
1067         int sendrc = 0;
1068
1069         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1070                         __func__, dev->name, smp_processor_id(), ch->id);
1071
1072         header = (struct th_header *)pskb->data;
1073         if ((header->th_seg == 0) &&
1074                 (header->th_ch_flag == 0) &&
1075                 (header->th_blk_flag == 0) &&
1076                 (header->th_seq_num == 0))
1077                 /* nothing for us */    goto done;
1078
1079         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1080         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1081         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1082
1083         pskb->dev = dev;
1084         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1085         skb_pull(pskb, TH_HEADER_LENGTH);
1086
1087         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1088                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1089                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1090                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1091                     (header->th_seq_num != ch->th_seq_num + 1) &&
1092                     (ch->th_seq_num != 0))) {
1093                         /* This is NOT the next segment         *
1094                          * we are not the correct race winner   *
1095                          * go away and let someone else win     *
1096                          * BUT..this only applies if xid negot  *
1097                          * is done                              *
1098                         */
1099                         grp->out_of_sequence += 1;
1100                         __skb_push(pskb, TH_HEADER_LENGTH);
1101                         skb_queue_tail(&ch->io_queue, pskb);
1102                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1103                                         "got:%08x\n", __func__,
1104                                 ch->th_seq_num + 1, header->th_seq_num);
1105
1106                         return;
1107                 }
1108                 grp->out_of_sequence = 0;
1109                 ch->th_seq_num = header->th_seq_num;
1110
1111                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1112                                         __func__, ch->th_seq_num);
1113
1114                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1115                                         goto done;
1116                 while ((pskb->len > 0) && !pdu_last_seen) {
1117                         curr_pdu = (struct pdu *)pskb->data;
1118
1119                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1120                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1121                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1122                                                 __func__, pskb->len);
1123
1124                         skb_pull(pskb, PDU_HEADER_LENGTH);
1125
1126                         if (curr_pdu->pdu_flag & PDU_LAST)
1127                                 pdu_last_seen = 1;
1128                         if (curr_pdu->pdu_flag & PDU_CNTL)
1129                                 pskb->protocol = htons(ETH_P_SNAP);
1130                         else
1131                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1132
1133                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1134                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1135                                         "%s(%s): Dropping packet with "
1136                                         "illegal siize %d",
1137                                         CTCM_FUNTAIL, dev->name, pskb->len);
1138
1139                                 priv->stats.rx_dropped++;
1140                                 priv->stats.rx_length_errors++;
1141                                         goto done;
1142                         }
1143                         skb_reset_mac_header(pskb);
1144                         new_len = curr_pdu->pdu_offset;
1145                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1146                                                 __func__, new_len);
1147                         if ((new_len == 0) || (new_len > pskb->len)) {
1148                                 /* should never happen              */
1149                                 /* pskb len must be hosed...bail out */
1150                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1151                                         "%s(%s): non valid pdu_offset: %04x",
1152                                         /* "data may be lost", */
1153                                         CTCM_FUNTAIL, dev->name, new_len);
1154                                 goto done;
1155                         }
1156                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1157
1158                         if (!skb) {
1159                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1160                                         "%s(%s): MEMORY allocation error",
1161                                                 CTCM_FUNTAIL, dev->name);
1162                                 priv->stats.rx_dropped++;
1163                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1164                                                 goto done;
1165                         }
1166                         memcpy(skb_put(skb, new_len), pskb->data, new_len);
1167
1168                         skb_reset_mac_header(skb);
1169                         skb->dev = pskb->dev;
1170                         skb->protocol = pskb->protocol;
1171                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1172                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1173                         ch->pdu_seq++;
1174
1175                         if (do_debug_data) {
1176                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1177                                                 __func__, ch->pdu_seq);
1178                                 ctcm_pr_debug("%s: skb:%0lx "
1179                                         "skb len: %d \n", __func__,
1180                                         (unsigned long)skb, skb->len);
1181                                 ctcm_pr_debug("%s: up to 32 bytes "
1182                                         "of pdu_data sent\n", __func__);
1183                                 ctcmpc_dump32((char *)skb->data, skb->len);
1184                         }
1185
1186                         skblen = skb->len;
1187                         sendrc = netif_rx(skb);
1188                         priv->stats.rx_packets++;
1189                         priv->stats.rx_bytes += skblen;
1190                         skb_pull(pskb, new_len); /* point to next PDU */
1191                 }
1192         } else {
1193                 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1194                 if (mpcginfo == NULL)
1195                                         goto done;
1196
1197                 mpcginfo->ch = ch;
1198                 mpcginfo->th = header;
1199                 mpcginfo->skb = pskb;
1200                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1201                                         __func__);
1202                 /*  it's a sweep?   */
1203                 sweep = (struct th_sweep *)pskb->data;
1204                 mpcginfo->sweep = sweep;
1205                 if (header->th_ch_flag == TH_SWEEP_REQ)
1206                         mpc_rcvd_sweep_req(mpcginfo);
1207                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1208                         mpc_rcvd_sweep_resp(mpcginfo);
1209                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1210                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1211                         skb_pull(pskb, XID2_LENGTH);
1212                         mpcginfo->xid = thisxid;
1213                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1214                 } else if (header->th_blk_flag == TH_DISCONTACT)
1215                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1216                 else if (header->th_seq_num != 0) {
1217                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1218                                 "%s(%s): control pkt expected\n",
1219                                                 CTCM_FUNTAIL, dev->name);
1220                         priv->stats.rx_dropped++;
1221                         /* mpcginfo only used for non-data transfers */
1222                         kfree(mpcginfo);
1223                         if (do_debug_data)
1224                                 ctcmpc_dump_skb(pskb, -8);
1225                 }
1226         }
1227 done:
1228
1229         dev_kfree_skb_any(pskb);
1230         if (sendrc == NET_RX_DROP) {
1231                 dev_warn(&dev->dev,
1232                         "The network backlog for %s is exceeded, "
1233                         "package dropped\n", __func__);
1234                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1235         }
1236
1237         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1238                         __func__, dev->name, ch, ch->id);
1239 }
1240
1241 /**
1242  * tasklet helper for mpc's skb unpacking.
1243  *
1244  * ch           The channel to work on.
1245  * Allow flow control back pressure to occur here.
1246  * Throttling back channel can result in excessive
1247  * channel inactivity and system deact of channel
1248  */
1249 void ctcmpc_bh(unsigned long thischan)
1250 {
1251         struct channel    *ch   = (struct channel *)thischan;
1252         struct sk_buff    *skb;
1253         struct net_device *dev  = ch->netdev;
1254         struct ctcm_priv  *priv = dev->ml_priv;
1255         struct mpc_group  *grp  = priv->mpcg;
1256
1257         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1258                dev->name, smp_processor_id(), __func__, ch->id);
1259         /* caller has requested driver to throttle back */
1260         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1261                         (skb = skb_dequeue(&ch->io_queue))) {
1262                 ctcmpc_unpack_skb(ch, skb);
1263                 if (grp->out_of_sequence > 20) {
1264                         /* assume data loss has occurred if */
1265                         /* missing seq_num for extended     */
1266                         /* period of time                   */
1267                         grp->out_of_sequence = 0;
1268                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1269                         break;
1270                 }
1271                 if (skb == skb_peek(&ch->io_queue))
1272                         break;
1273         }
1274         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1275                         __func__, dev->name, ch, ch->id);
1276         return;
1277 }
1278
1279 /*
1280  *  MPC Group Initializations
1281  */
1282 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1283 {
1284         struct mpc_group *grp;
1285
1286         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1287                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1288
1289         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1290         if (grp == NULL)
1291                 return NULL;
1292
1293         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1294                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1295                         mpcg_fsm_len, GFP_KERNEL);
1296         if (grp->fsm == NULL) {
1297                 kfree(grp);
1298                 return NULL;
1299         }
1300
1301         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1302         fsm_settimer(grp->fsm, &grp->timer);
1303
1304         grp->xid_skb =
1305                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1306         if (grp->xid_skb == NULL) {
1307                 kfree_fsm(grp->fsm);
1308                 kfree(grp);
1309                 return NULL;
1310         }
1311         /*  base xid for all channels in group  */
1312         grp->xid_skb_data = grp->xid_skb->data;
1313         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1314         memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1315                         &thnorm, TH_HEADER_LENGTH);
1316
1317         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1318         memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1319         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1320         grp->xid->xid2_sender_id = jiffies;
1321
1322         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1323         memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1324
1325         grp->rcvd_xid_skb =
1326                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1327         if (grp->rcvd_xid_skb == NULL) {
1328                 kfree_fsm(grp->fsm);
1329                 dev_kfree_skb(grp->xid_skb);
1330                 kfree(grp);
1331                 return NULL;
1332         }
1333         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1334         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1335         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1336                         &thnorm, TH_HEADER_LENGTH);
1337         grp->saved_xid2 = NULL;
1338         priv->xid = grp->xid;
1339         priv->mpcg = grp;
1340         return grp;
1341 }
1342
1343 /*
1344  * The MPC Group Station FSM
1345  */
1346
1347 /*
1348  * MPC Group Station FSM actions
1349  * CTCM_PROTO_MPC only
1350  */
1351
1352 /**
1353  * NOP action for statemachines
1354  */
1355 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1356 {
1357 }
1358
1359 /*
1360  * invoked when the device transitions to dev_stopped
1361  * MPC will stop each individual channel if a single XID failure
1362  * occurs, or will intitiate all channels be stopped if a GROUP
1363  * level failure occurs.
1364  */
1365 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1366 {
1367         struct net_device  *dev = arg;
1368         struct ctcm_priv    *priv;
1369         struct mpc_group *grp;
1370         int rc = 0;
1371         struct channel *wch, *rch;
1372
1373         BUG_ON(dev == NULL);
1374         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1375
1376         priv  = dev->ml_priv;
1377         grp =  priv->mpcg;
1378         grp->flow_off_called = 0;
1379         fsm_deltimer(&grp->timer);
1380         if (grp->channels_terminating)
1381                         return;
1382
1383         grp->channels_terminating = 1;
1384         grp->saved_state = fsm_getstate(grp->fsm);
1385         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1386         if (grp->saved_state > MPCG_STATE_XID7INITF)
1387                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1388                         "%s(%s): MPC GROUP INOPERATIVE",
1389                                 CTCM_FUNTAIL, dev->name);
1390         if ((grp->saved_state != MPCG_STATE_RESET) ||
1391                 /* dealloc_channel has been called */
1392                 (grp->port_persist == 0))
1393                 fsm_deltimer(&priv->restart_timer);
1394
1395         wch = priv->channel[WRITE];
1396         rch = priv->channel[READ];
1397
1398         switch (grp->saved_state) {
1399         case MPCG_STATE_RESET:
1400         case MPCG_STATE_INOP:
1401         case MPCG_STATE_XID2INITW:
1402         case MPCG_STATE_XID0IOWAIT:
1403         case MPCG_STATE_XID2INITX:
1404         case MPCG_STATE_XID7INITW:
1405         case MPCG_STATE_XID7INITX:
1406         case MPCG_STATE_XID0IOWAIX:
1407         case MPCG_STATE_XID7INITI:
1408         case MPCG_STATE_XID7INITZ:
1409         case MPCG_STATE_XID7INITF:
1410                 break;
1411         case MPCG_STATE_FLOWC:
1412         case MPCG_STATE_READY:
1413         default:
1414                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1415         }
1416
1417         grp->xid2_tgnum = 0;
1418         grp->group_max_buflen = 0;  /*min of all received */
1419         grp->outstanding_xid2 = 0;
1420         grp->outstanding_xid7 = 0;
1421         grp->outstanding_xid7_p2 = 0;
1422         grp->saved_xid2 = NULL;
1423         grp->xidnogood = 0;
1424         grp->changed_side = 0;
1425
1426         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1427         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1428         grp->rcvd_xid_skb->len = 0;
1429         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1430         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1431                TH_HEADER_LENGTH);
1432
1433         if (grp->send_qllc_disc == 1) {
1434                 grp->send_qllc_disc = 0;
1435                 rc = mpc_send_qllc_discontact(dev);
1436         }
1437
1438         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1439         /* This can result in INOP of VTAM PU due to halting of  */
1440         /* outstanding IO which causes a sense to be returned    */
1441         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1442         /* become unreachable without manual intervention        */
1443         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1444                 grp->alloc_called = 0;
1445                 fsm_deltimer(&priv->restart_timer);
1446                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1447                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1448                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1449                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1450                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1451                                         CTCM_FUNTAIL, dev->name);
1452         } else {
1453                 fsm_deltimer(&priv->restart_timer);
1454                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1455                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1456                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1457                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1458                                                 CTCM_FUNTAIL, dev->name);
1459         }
1460 }
1461
1462 /**
1463  * Handle mpc group  action timeout.
1464  * MPC Group Station FSM action
1465  * CTCM_PROTO_MPC only
1466  *
1467  * fi           An instance of an mpc_group fsm.
1468  * event        The event, just happened.
1469  * arg          Generic pointer, casted from net_device * upon call.
1470  */
1471 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1472 {
1473         struct net_device *dev = arg;
1474         struct ctcm_priv *priv;
1475         struct mpc_group *grp;
1476         struct channel *wch;
1477         struct channel *rch;
1478
1479         BUG_ON(dev == NULL);
1480
1481         priv = dev->ml_priv;
1482         grp = priv->mpcg;
1483         wch = priv->channel[WRITE];
1484         rch = priv->channel[READ];
1485
1486         switch (fsm_getstate(grp->fsm)) {
1487         case MPCG_STATE_XID2INITW:
1488                 /* Unless there is outstanding IO on the  */
1489                 /* channel just return and wait for ATTN  */
1490                 /* interrupt to begin XID negotiations    */
1491                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1492                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1493                         break;
1494         default:
1495                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1496         }
1497
1498         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1499                         "%s: dev=%s exit",
1500                         CTCM_FUNTAIL, dev->name);
1501         return;
1502 }
1503
1504 /*
1505  * MPC Group Station FSM action
1506  * CTCM_PROTO_MPC only
1507  */
1508 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1509 {
1510         struct mpcg_info   *mpcginfo   = arg;
1511         struct channel     *ch         = mpcginfo->ch;
1512         struct net_device  *dev;
1513         struct ctcm_priv   *priv;
1514         struct mpc_group   *grp;
1515
1516         if (ch) {
1517                 dev = ch->netdev;
1518                 if (dev) {
1519                         priv = dev->ml_priv;
1520                         if (priv) {
1521                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1522                                         "%s: %s: %s\n",
1523                                         CTCM_FUNTAIL, dev->name, ch->id);
1524                                 grp = priv->mpcg;
1525                                 grp->send_qllc_disc = 1;
1526                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1527                         }
1528                 }
1529         }
1530
1531         return;
1532 }
1533
1534 /*
1535  * MPC Group Station - not part of FSM
1536  * CTCM_PROTO_MPC only
1537  * called from add_channel in ctcm_main.c
1538  */
1539 void mpc_action_send_discontact(unsigned long thischan)
1540 {
1541         int rc;
1542         struct channel  *ch = (struct channel *)thischan;
1543         unsigned long   saveflags = 0;
1544
1545         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1546         rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1547                                         (unsigned long)ch, 0xff, 0);
1548         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1549
1550         if (rc != 0) {
1551                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1552         }
1553
1554         return;
1555 }
1556
1557
1558 /*
1559  * helper function of mpc FSM
1560  * CTCM_PROTO_MPC only
1561  * mpc_action_rcvd_xid7
1562 */
1563 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1564 {
1565         struct channel     *ch   = mpcginfo->ch;
1566         struct net_device  *dev  = ch->netdev;
1567         struct ctcm_priv   *priv = dev->ml_priv;
1568         struct mpc_group   *grp  = priv->mpcg;
1569         struct xid2        *xid  = mpcginfo->xid;
1570         int     rc       = 0;
1571         __u64   our_id   = 0;
1572         __u64   their_id = 0;
1573         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1574
1575         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1576
1577         if (xid == NULL) {
1578                 rc = 1;
1579                 /* XID REJECTED: xid == NULL */
1580                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1581                         "%s(%s): xid = NULL",
1582                                 CTCM_FUNTAIL, ch->id);
1583                         goto done;
1584         }
1585
1586         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1587
1588         /*the received direction should be the opposite of ours  */
1589         if (((CHANNEL_DIRECTION(ch->flags) == READ) ? XID2_WRITE_SIDE :
1590                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1591                 rc = 2;
1592                 /* XID REJECTED: r/w channel pairing mismatch */
1593                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1594                         "%s(%s): r/w channel pairing mismatch",
1595                                 CTCM_FUNTAIL, ch->id);
1596                         goto done;
1597         }
1598
1599         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1600                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1601                                 grp->group_max_buflen, xid->xid2_buf_len);
1602
1603                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1604                                                 xid->xid2_buf_len - len)
1605                         grp->group_max_buflen = xid->xid2_buf_len - len;
1606         }
1607
1608         if (grp->saved_xid2 == NULL) {
1609                 grp->saved_xid2 =
1610                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1611
1612                 memcpy(skb_put(grp->rcvd_xid_skb,
1613                                         XID2_LENGTH), xid, XID2_LENGTH);
1614                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1615
1616                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1617                 grp->rcvd_xid_skb->len = 0;
1618
1619                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1620                 our_id = (__u64)priv->xid->xid2_adj_id;
1621                 our_id = our_id << 32;
1622                 our_id = our_id + priv->xid->xid2_sender_id;
1623                 their_id = (__u64)xid->xid2_adj_id;
1624                 their_id = their_id << 32;
1625                 their_id = their_id + xid->xid2_sender_id;
1626                 /* lower id assume the xside role */
1627                 if (our_id < their_id) {
1628                         grp->roll = XSIDE;
1629                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1630                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1631                                         CTCM_FUNTAIL, ch->id);
1632                 } else {
1633                         grp->roll = YSIDE;
1634                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1635                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1636                                         CTCM_FUNTAIL, ch->id);
1637                 }
1638
1639         } else {
1640                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1641                         rc = 3;
1642                         /* XID REJECTED: xid flag byte4 mismatch */
1643                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1644                                 "%s(%s): xid flag byte4 mismatch",
1645                                         CTCM_FUNTAIL, ch->id);
1646                 }
1647                 if (xid->xid2_flag2 == 0x40) {
1648                         rc = 4;
1649                         /* XID REJECTED - xid NOGOOD */
1650                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1651                                 "%s(%s): xid NOGOOD",
1652                                         CTCM_FUNTAIL, ch->id);
1653                 }
1654                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1655                         rc = 5;
1656                         /* XID REJECTED - Adjacent Station ID Mismatch */
1657                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1658                                 "%s(%s): Adjacent Station ID Mismatch",
1659                                         CTCM_FUNTAIL, ch->id);
1660                 }
1661                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1662                         rc = 6;
1663                         /* XID REJECTED - Sender Address Mismatch */
1664                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1665                                 "%s(%s): Sender Address Mismatch",
1666                                         CTCM_FUNTAIL, ch->id);
1667                 }
1668         }
1669 done:
1670         if (rc) {
1671                 dev_warn(&dev->dev,
1672                         "The XID used in the MPC protocol is not valid, "
1673                         "rc = %d\n", rc);
1674                 priv->xid->xid2_flag2 = 0x40;
1675                 grp->saved_xid2->xid2_flag2 = 0x40;
1676         }
1677
1678         return rc;
1679 }
1680
1681 /*
1682  * MPC Group Station FSM action
1683  * CTCM_PROTO_MPC only
1684  */
1685 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1686 {
1687         struct channel *ch = arg;
1688         int rc = 0;
1689         int gotlock = 0;
1690         unsigned long saveflags = 0;    /* avoids compiler warning with
1691                                            spin_unlock_irqrestore */
1692
1693         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1694                         __func__, smp_processor_id(), ch, ch->id);
1695
1696         if (ctcm_checkalloc_buffer(ch))
1697                                         goto done;
1698
1699         /*
1700          * skb data-buffer referencing:
1701          */
1702         ch->trans_skb->data = ch->trans_skb_data;
1703         skb_reset_tail_pointer(ch->trans_skb);
1704         ch->trans_skb->len = 0;
1705         /* result of the previous 3 statements is NOT always
1706          * already set after ctcm_checkalloc_buffer
1707          * because of possible reuse of the trans_skb
1708          */
1709         memset(ch->trans_skb->data, 0, 16);
1710         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1711         /* check is main purpose here: */
1712         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1713         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1714         /* check is main purpose here: */
1715         skb_put(ch->trans_skb, XID2_LENGTH);
1716         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1717         /* cleanup back to startpoint */
1718         ch->trans_skb->data = ch->trans_skb_data;
1719         skb_reset_tail_pointer(ch->trans_skb);
1720         ch->trans_skb->len = 0;
1721
1722         /* non-checking rewrite of above skb data-buffer referencing: */
1723         /*
1724         memset(ch->trans_skb->data, 0, 16);
1725         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1726         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1727         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1728          */
1729
1730         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1731         ch->ccw[8].count        = 0;
1732         ch->ccw[8].cda          = 0x00;
1733
1734         if (!(ch->xid_th && ch->xid && ch->xid_id))
1735                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1736                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1737                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1738
1739         if (side == XSIDE) {
1740                 /* mpc_action_xside_xid */
1741                 if (ch->xid_th == NULL)
1742                                 goto done;
1743                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1744                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1745                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1746                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1747
1748                 if (ch->xid == NULL)
1749                                 goto done;
1750                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1751                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1752                 ch->ccw[10].count       = XID2_LENGTH;
1753                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1754
1755                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1756                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1757                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1758                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1759
1760                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1761                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1762                 ch->ccw[12].count       = XID2_LENGTH;
1763                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1764
1765                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1766                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1767
1768         } else { /* side == YSIDE : mpc_action_yside_xid */
1769                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1770                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1771                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1772                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1773
1774                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1775                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1776                 ch->ccw[10].count       = XID2_LENGTH;
1777                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1778
1779                 if (ch->xid_th == NULL)
1780                                 goto done;
1781                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1782                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1783                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1784                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1785
1786                 if (ch->xid == NULL)
1787                                 goto done;
1788                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1789                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1790                 ch->ccw[12].count       = XID2_LENGTH;
1791                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1792
1793                 if (ch->xid_id == NULL)
1794                                 goto done;
1795                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1796                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1797
1798         }
1799         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1800         ch->ccw[13].count       = 4;
1801
1802         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1803         ch->ccw[14].flags       = CCW_FLAG_SLI;
1804         ch->ccw[14].count       = 0;
1805         ch->ccw[14].cda         = 0;
1806
1807         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1808         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1809         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1810         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1811
1812         if (!in_irq()) {
1813                          /* Such conditional locking is a known problem for
1814                           * sparse because its static undeterministic.
1815                           * Warnings should be ignored here. */
1816                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1817                 gotlock = 1;
1818         }
1819
1820         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1821         rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1822                                 (unsigned long)ch, 0xff, 0);
1823
1824         if (gotlock)    /* see remark above about conditional locking */
1825                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1826
1827         if (rc != 0) {
1828                 ctcm_ccw_check_rc(ch, rc,
1829                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1830         }
1831
1832 done:
1833         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1834                                 __func__, ch, ch->id);
1835         return;
1836
1837 }
1838
1839 /*
1840  * MPC Group Station FSM action
1841  * CTCM_PROTO_MPC only
1842  */
1843 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1844 {
1845         mpc_action_side_xid(fsm, arg, XSIDE);
1846 }
1847
1848 /*
1849  * MPC Group Station FSM action
1850  * CTCM_PROTO_MPC only
1851  */
1852 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1853 {
1854         mpc_action_side_xid(fsm, arg, YSIDE);
1855 }
1856
1857 /*
1858  * MPC Group Station FSM action
1859  * CTCM_PROTO_MPC only
1860  */
1861 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1862 {
1863         struct channel     *ch   = arg;
1864         struct net_device  *dev  = ch->netdev;
1865         struct ctcm_priv   *priv = dev->ml_priv;
1866         struct mpc_group   *grp  = priv->mpcg;
1867
1868         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1869                         __func__, smp_processor_id(), ch, ch->id);
1870
1871         if (ch->xid == NULL) {
1872                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1873                         "%s(%s): ch->xid == NULL",
1874                                 CTCM_FUNTAIL, dev->name);
1875                 return;
1876         }
1877
1878         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1879
1880         ch->xid->xid2_option =  XID2_0;
1881
1882         switch (fsm_getstate(grp->fsm)) {
1883         case MPCG_STATE_XID2INITW:
1884         case MPCG_STATE_XID2INITX:
1885                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1886                 break;
1887         case MPCG_STATE_XID0IOWAIT:
1888         case MPCG_STATE_XID0IOWAIX:
1889                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1890                 break;
1891         }
1892
1893         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1894
1895         return;
1896 }
1897
1898 /*
1899  * MPC Group Station FSM action
1900  * CTCM_PROTO_MPC only
1901 */
1902 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1903 {
1904         struct net_device *dev = arg;
1905         struct ctcm_priv  *priv = dev->ml_priv;
1906         struct mpc_group  *grp  = NULL;
1907         int direction;
1908         int send = 0;
1909
1910         if (priv)
1911                 grp = priv->mpcg;
1912         if (grp == NULL)
1913                 return;
1914
1915         for (direction = READ; direction <= WRITE; direction++) {
1916                 struct channel *ch = priv->channel[direction];
1917                 struct xid2 *thisxid = ch->xid;
1918                 ch->xid_skb->data = ch->xid_skb_data;
1919                 skb_reset_tail_pointer(ch->xid_skb);
1920                 ch->xid_skb->len = 0;
1921                 thisxid->xid2_option = XID2_7;
1922                 send = 0;
1923
1924                 /* xid7 phase 1 */
1925                 if (grp->outstanding_xid7_p2 > 0) {
1926                         if (grp->roll == YSIDE) {
1927                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1928                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1929                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1930                                         memcpy(skb_put(ch->xid_skb,
1931                                                         TH_HEADER_LENGTH),
1932                                                &thdummy, TH_HEADER_LENGTH);
1933                                         send = 1;
1934                                 }
1935                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1936                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1937                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1938                                         memcpy(skb_put(ch->xid_skb,
1939                                                        TH_HEADER_LENGTH),
1940                                                &thnorm, TH_HEADER_LENGTH);
1941                                         send = 1;
1942                         }
1943                 } else {
1944                         /* xid7 phase 2 */
1945                         if (grp->roll == YSIDE) {
1946                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1947                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1948                                         memcpy(skb_put(ch->xid_skb,
1949                                                        TH_HEADER_LENGTH),
1950                                                &thnorm, TH_HEADER_LENGTH);
1951                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1952                                         send = 1;
1953                                 }
1954                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1955                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1956                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1957                                 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1958                                                 &thdummy, TH_HEADER_LENGTH);
1959                                 send = 1;
1960                         }
1961                 }
1962
1963                 if (send)
1964                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1965         }
1966
1967         return;
1968 }
1969
1970 /*
1971  * MPC Group Station FSM action
1972  * CTCM_PROTO_MPC only
1973  */
1974 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1975 {
1976
1977         struct mpcg_info   *mpcginfo  = arg;
1978         struct channel     *ch   = mpcginfo->ch;
1979         struct net_device  *dev  = ch->netdev;
1980         struct ctcm_priv   *priv = dev->ml_priv;
1981         struct mpc_group   *grp  = priv->mpcg;
1982
1983         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1984                         __func__, ch->id, grp->outstanding_xid2,
1985                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1986
1987         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1988                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1989
1990         grp->outstanding_xid2--;
1991         grp->outstanding_xid7++;
1992         grp->outstanding_xid7_p2++;
1993
1994         /* must change state before validating xid to */
1995         /* properly handle interim interrupts received*/
1996         switch (fsm_getstate(grp->fsm)) {
1997         case MPCG_STATE_XID2INITW:
1998                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1999                 mpc_validate_xid(mpcginfo);
2000                 break;
2001         case MPCG_STATE_XID0IOWAIT:
2002                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
2003                 mpc_validate_xid(mpcginfo);
2004                 break;
2005         case MPCG_STATE_XID2INITX:
2006                 if (grp->outstanding_xid2 == 0) {
2007                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
2008                         mpc_validate_xid(mpcginfo);
2009                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2010                 }
2011                 break;
2012         case MPCG_STATE_XID0IOWAIX:
2013                 if (grp->outstanding_xid2 == 0) {
2014                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
2015                         mpc_validate_xid(mpcginfo);
2016                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
2017                 }
2018                 break;
2019         }
2020         kfree(mpcginfo);
2021
2022         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2023                 __func__, ch->id, grp->outstanding_xid2,
2024                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2025         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2026                 __func__, ch->id,
2027                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2028         return;
2029
2030 }
2031
2032
2033 /*
2034  * MPC Group Station FSM action
2035  * CTCM_PROTO_MPC only
2036  */
2037 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2038 {
2039         struct mpcg_info   *mpcginfo   = arg;
2040         struct channel     *ch         = mpcginfo->ch;
2041         struct net_device  *dev        = ch->netdev;
2042         struct ctcm_priv   *priv    = dev->ml_priv;
2043         struct mpc_group   *grp     = priv->mpcg;
2044
2045         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2046                 __func__, smp_processor_id(), ch, ch->id);
2047         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2048                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2049
2050         grp->outstanding_xid7--;
2051         ch->xid_skb->data = ch->xid_skb_data;
2052         skb_reset_tail_pointer(ch->xid_skb);
2053         ch->xid_skb->len = 0;
2054
2055         switch (fsm_getstate(grp->fsm)) {
2056         case MPCG_STATE_XID7INITI:
2057                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2058                 mpc_validate_xid(mpcginfo);
2059                 break;
2060         case MPCG_STATE_XID7INITW:
2061                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2062                 mpc_validate_xid(mpcginfo);
2063                 break;
2064         case MPCG_STATE_XID7INITZ:
2065         case MPCG_STATE_XID7INITX:
2066                 if (grp->outstanding_xid7 == 0) {
2067                         if (grp->outstanding_xid7_p2 > 0) {
2068                                 grp->outstanding_xid7 =
2069                                         grp->outstanding_xid7_p2;
2070                                 grp->outstanding_xid7_p2 = 0;
2071                         } else
2072                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2073
2074                         mpc_validate_xid(mpcginfo);
2075                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2076                         break;
2077                 }
2078                 mpc_validate_xid(mpcginfo);
2079                 break;
2080         }
2081         kfree(mpcginfo);
2082         return;
2083 }
2084
2085 /*
2086  * mpc_action helper of an MPC Group Station FSM action
2087  * CTCM_PROTO_MPC only
2088  */
2089 static int mpc_send_qllc_discontact(struct net_device *dev)
2090 {
2091         __u32   new_len = 0;
2092         struct sk_buff   *skb;
2093         struct qllc      *qllcptr;
2094         struct ctcm_priv *priv = dev->ml_priv;
2095         struct mpc_group *grp = priv->mpcg;
2096
2097         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2098                 __func__, mpcg_state_names[grp->saved_state]);
2099
2100         switch (grp->saved_state) {
2101         /*
2102          * establish conn callback function is
2103          * preferred method to report failure
2104          */
2105         case MPCG_STATE_XID0IOWAIT:
2106         case MPCG_STATE_XID0IOWAIX:
2107         case MPCG_STATE_XID7INITI:
2108         case MPCG_STATE_XID7INITZ:
2109         case MPCG_STATE_XID2INITW:
2110         case MPCG_STATE_XID2INITX:
2111         case MPCG_STATE_XID7INITW:
2112         case MPCG_STATE_XID7INITX:
2113                 if (grp->estconnfunc) {
2114                         grp->estconnfunc(grp->port_num, -1, 0);
2115                         grp->estconnfunc = NULL;
2116                         break;
2117                 }
2118         case MPCG_STATE_FLOWC:
2119         case MPCG_STATE_READY:
2120                 grp->send_qllc_disc = 2;
2121                 new_len = sizeof(struct qllc);
2122                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2123                 if (qllcptr == NULL) {
2124                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2125                                 "%s(%s): qllcptr allocation error",
2126                                                 CTCM_FUNTAIL, dev->name);
2127                         return -ENOMEM;
2128                 }
2129
2130                 qllcptr->qllc_address = 0xcc;
2131                 qllcptr->qllc_commands = 0x03;
2132
2133                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2134
2135                 if (skb == NULL) {
2136                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2137                                 "%s(%s): skb allocation error",
2138                                                 CTCM_FUNTAIL, dev->name);
2139                         priv->stats.rx_dropped++;
2140                         kfree(qllcptr);
2141                         return -ENOMEM;
2142                 }
2143
2144                 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2145                 kfree(qllcptr);
2146
2147                 if (skb_headroom(skb) < 4) {
2148                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2149                                 "%s(%s): skb_headroom error",
2150                                                 CTCM_FUNTAIL, dev->name);
2151                         dev_kfree_skb_any(skb);
2152                         return -ENOMEM;
2153                 }
2154
2155                 *((__u32 *)skb_push(skb, 4)) = priv->channel[READ]->pdu_seq;
2156                 priv->channel[READ]->pdu_seq++;
2157                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2158                                 __func__, priv->channel[READ]->pdu_seq);
2159
2160                 /* receipt of CC03 resets anticipated sequence number on
2161                       receiving side */
2162                 priv->channel[READ]->pdu_seq = 0x00;
2163                 skb_reset_mac_header(skb);
2164                 skb->dev = dev;
2165                 skb->protocol = htons(ETH_P_SNAP);
2166                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2167
2168                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2169
2170                 netif_rx(skb);
2171                 break;
2172         default:
2173                 break;
2174
2175         }
2176
2177         return 0;
2178 }
2179 /* --- This is the END my friend --- */
2180