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