drivers/s390/net/ctcm_mpc.c

   1 /*
   2  *      Copyright IBM Corp. 2004, 2007
   3  *      Authors:        Belinda Thompson ([email protected])
   4  *                      Andy Richter ([email protected])
   5  *                      Peter Tiedemann ([email protected])
   6  */
   7
   8 /*
   9         This module exports functions to be used by CCS:
  10         EXPORT_SYMBOL(ctc_mpc_alloc_channel);
  11         EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
  12         EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
  13         EXPORT_SYMBOL(ctc_mpc_flow_control);
  14 */
  15
  16 #undef DEBUG
  17 #undef DEBUGDATA
  18 #undef DEBUGCCW
  19
  20 #define KMSG_COMPONENT "ctcm"
  21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/kernel.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/types.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/timer.h>
  31 #include <linux/sched.h>
  32
  33 #include <linux/signal.h>
  34 #include <linux/string.h>
  35 #include <linux/proc_fs.h>
  36
  37 #include <linux/ip.h>
  38 #include <linux/if_arp.h>
  39 #include <linux/tcp.h>
  40 #include <linux/skbuff.h>
  41 #include <linux/ctype.h>
  42 #include <linux/netdevice.h>
  43 #include <net/dst.h>
  44
  45 #include <linux/io.h>           /* instead of <asm/io.h> ok ? */
  46 #include <asm/ccwdev.h>
  47 #include <asm/ccwgroup.h>
  48 #include <linux/bitops.h>       /* instead of <asm/bitops.h> ok ? */
  49 #include <linux/uaccess.h>      /* instead of <asm/uaccess.h> ok ? */
  50 #include <linux/wait.h>
  51 #include <linux/moduleparam.h>
  52 #include <asm/idals.h>
  53
  54 #include "ctcm_main.h"
  55 #include "ctcm_mpc.h"
  56 #include "ctcm_fsms.h"
  57
  58 static const struct xid2 init_xid = {
  59         .xid2_type_id   =       XID_FM2,
  60         .xid2_len       =       0x45,
  61         .xid2_adj_id    =       0,
  62         .xid2_rlen      =       0x31,
  63         .xid2_resv1     =       0,
  64         .xid2_flag1     =       0,
  65         .xid2_fmtt      =       0,
  66         .xid2_flag4     =       0x80,
  67         .xid2_resv2     =       0,
  68         .xid2_tgnum     =       0,
  69         .xid2_sender_id =       0,
  70         .xid2_flag2     =       0,
  71         .xid2_option    =       XID2_0,
  72         .xid2_resv3     =       "\x00",
  73         .xid2_resv4     =       0,
  74         .xid2_dlc_type  =       XID2_READ_SIDE,
  75         .xid2_resv5     =       0,
  76         .xid2_mpc_flag  =       0,
  77         .xid2_resv6     =       0,
  78         .xid2_buf_len   =       (MPC_BUFSIZE_DEFAULT - 35),
  79 };
  80
  81 static const struct th_header thnorm = {
  82         .th_seg         =       0x00,
  83         .th_ch_flag     =       TH_IS_XID,
  84         .th_blk_flag    =       TH_DATA_IS_XID,
  85         .th_is_xid      =       0x01,
  86         .th_seq_num     =       0x00000000,
  87 };
  88
  89 static const struct th_header thdummy = {
  90         .th_seg         =       0x00,
  91         .th_ch_flag     =       0x00,
  92         .th_blk_flag    =       TH_DATA_IS_XID,
  93         .th_is_xid      =       0x01,
  94         .th_seq_num     =       0x00000000,
  95 };
  96
  97 /*
  98  * Definition of one MPC group
  99  */
 100
 101 /*
 102  * Compatibility macros for busy handling
 103  * of network devices.
 104  */
 105
 106 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb);
 107
 108 /*
 109  * MPC Group state machine actions (static prototypes)
 110  */
 111 static void mpc_action_nop(fsm_instance *fsm, int event, void *arg);
 112 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg);
 113 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg);
 114 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg);
 115 static int  mpc_validate_xid(struct mpcg_info *mpcginfo);
 116 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg);
 117 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg);
 118 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg);
 119 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg);
 120 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg);
 121 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg);
 122
 123 #ifdef DEBUGDATA
 124 /*-------------------------------------------------------------------*
 125 * Dump buffer format                                                 *
 126 *                                                                    *
 127 *--------------------------------------------------------------------*/
 128 void ctcmpc_dumpit(char *buf, int len)
 129 {
 130         __u32   ct, sw, rm, dup;
 131         char    *ptr, *rptr;
 132         char    tbuf[82], tdup[82];
 133         char    addr[22];
 134         char    boff[12];
 135         char    bhex[82], duphex[82];
 136         char    basc[40];
 137
 138         sw  = 0;
 139         rptr = ptr = buf;
 140         rm  = 16;
 141         duphex[0] = 0x00;
 142         dup = 0;
 143
 144         for (ct = 0; ct < len; ct++, ptr++, rptr++) {
 145                 if (sw == 0) {
 146                         sprintf(addr, "%16.16llx", (__u64)rptr);
 147
 148                         sprintf(boff, "%4.4X", (__u32)ct);
 149                         bhex[0] = '\0';
 150                         basc[0] = '\0';
 151                 }
 152                 if ((sw == 4) || (sw == 12))
 153                         strcat(bhex, " ");
 154                 if (sw == 8)
 155                         strcat(bhex, "  ");
 156
 157                 sprintf(tbuf, "%2.2llX", (__u64)*ptr);
 158
 159                 tbuf[2] = '\0';
 160                 strcat(bhex, tbuf);
 161                 if ((0 != isprint(*ptr)) && (*ptr >= 0x20))
 162                         basc[sw] = *ptr;
 163                 else
 164                         basc[sw] = '.';
 165
 166                 basc[sw+1] = '\0';
 167                 sw++;
 168                 rm--;
 169                 if (sw != 16)
 170                         continue;
 171                 if ((strcmp(duphex, bhex)) != 0) {
 172                         if (dup != 0) {
 173                                 sprintf(tdup,
 174                                         "Duplicate as above to %s", addr);
 175                                 ctcm_pr_debug("                --- %s ---\n",
 176                                                 tdup);
 177                         }
 178                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 179                                         addr, boff, bhex, basc);
 180                         dup = 0;
 181                         strcpy(duphex, bhex);
 182                 } else
 183                         dup++;
 184
 185                 sw = 0;
 186                 rm = 16;
 187         }  /* endfor */
 188
 189         if (sw != 0) {
 190                 for ( ; rm > 0; rm--, sw++) {
 191                         if ((sw == 4) || (sw == 12))
 192                                 strcat(bhex, " ");
 193                         if (sw == 8)
 194                                 strcat(bhex, "  ");
 195                         strcat(bhex, "  ");
 196                         strcat(basc, " ");
 197                 }
 198                 if (dup != 0) {
 199                         sprintf(tdup, "Duplicate as above to %s", addr);
 200                         ctcm_pr_debug("                --- %s ---\n", tdup);
 201                 }
 202                 ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 203                                         addr, boff, bhex, basc);
 204         } else {
 205                 if (dup >= 1) {
 206                         sprintf(tdup, "Duplicate as above to %s", addr);
 207                         ctcm_pr_debug("                --- %s ---\n", tdup);
 208                 }
 209                 if (dup != 0) {
 210                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 211                                 addr, boff, bhex, basc);
 212                 }
 213         }
 214
 215         return;
 216
 217 }   /*   end of ctcmpc_dumpit  */
 218 #endif
 219
 220 #ifdef DEBUGDATA
 221 /*
 222  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 223  *
 224  * skb          The sk_buff to dump.
 225  * offset       Offset relative to skb-data, where to start the dump.
 226  */
 227 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
 228 {
 229         __u8 *p = skb->data;
 230         struct th_header *header;
 231         struct pdu *pheader;
 232         int bl = skb->len;
 233         int i;
 234
 235         if (p == NULL)
 236                 return;
 237
 238         p += offset;
 239         header = (struct th_header *)p;
 240
 241         ctcm_pr_debug("dump:\n");
 242         ctcm_pr_debug("skb len=%d \n", skb->len);
 243         if (skb->len > 2) {
 244                 switch (header->th_ch_flag) {
 245                 case TH_HAS_PDU:
 246                         break;
 247                 case 0x00:
 248                 case TH_IS_XID:
 249                         if ((header->th_blk_flag == TH_DATA_IS_XID) &&
 250                            (header->th_is_xid == 0x01))
 251                                 goto dumpth;
 252                 case TH_SWEEP_REQ:
 253                                 goto dumpth;
 254                 case TH_SWEEP_RESP:
 255                                 goto dumpth;
 256                 default:
 257                         break;
 258                 }
 259
 260                 pheader = (struct pdu *)p;
 261                 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
 262                                pheader->pdu_offset, pheader->pdu_offset);
 263                 ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
 264                 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
 265                 ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
 266                                         goto dumpdata;
 267
 268 dumpth:
 269                 ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
 270                 ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
 271                 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
 272                 ctcm_pr_debug("th->type    : %s\n",
 273                                (header->th_is_xid) ? "DATA" : "XID");
 274                 ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
 275
 276         }
 277 dumpdata:
 278         if (bl > 32)
 279                 bl = 32;
 280         ctcm_pr_debug("data: ");
 281         for (i = 0; i < bl; i++)
 282                 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
 283         ctcm_pr_debug("\n");
 284 }
 285 #endif
 286
 287 static struct net_device *ctcmpc_get_dev(int port_num)
 288 {
 289         char device[20];
 290         struct net_device *dev;
 291         struct ctcm_priv *priv;
 292
 293         sprintf(device, "%s%i", MPC_DEVICE_NAME, port_num);
 294
 295         dev = __dev_get_by_name(&init_net, device);
 296
 297         if (dev == NULL) {
 298                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 299                         "%s: Device not found by name: %s",
 300                                         CTCM_FUNTAIL, device);
 301                 return NULL;
 302         }
 303         priv = dev->ml_priv;
 304         if (priv == NULL) {
 305                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 306                         "%s(%s): dev->ml_priv is NULL",
 307                                         CTCM_FUNTAIL, device);
 308                 return NULL;
 309         }
 310         if (priv->mpcg == NULL) {
 311                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 312                         "%s(%s): priv->mpcg is NULL",
 313                                         CTCM_FUNTAIL, device);
 314                 return NULL;
 315         }
 316         return dev;
 317 }
 318
 319 /*
 320  * ctc_mpc_alloc_channel
 321  *      (exported interface)
 322  *
 323  * Device Initialization :
 324  *      ACTPATH  driven IO operations
 325  */
 326 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
 327 {
 328         struct net_device *dev;
 329         struct mpc_group *grp;
 330         struct ctcm_priv *priv;
 331
 332         dev = ctcmpc_get_dev(port_num);
 333         if (dev == NULL)
 334                 return 1;
 335         priv = dev->ml_priv;
 336         grp = priv->mpcg;
 337
 338         grp->allochanfunc = callback;
 339         grp->port_num = port_num;
 340         grp->port_persist = 1;
 341
 342         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 343                         "%s(%s): state=%s",
 344                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 345
 346         switch (fsm_getstate(grp->fsm)) {
 347         case MPCG_STATE_INOP:
 348                 /* Group is in the process of terminating */
 349                 grp->alloc_called = 1;
 350                 break;
 351         case MPCG_STATE_RESET:
 352                 /* MPC Group will transition to state             */
 353                 /* MPCG_STATE_XID2INITW iff the minimum number    */
 354                 /* of 1 read and 1 write channel have successfully*/
 355                 /* activated                                      */
 356                 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
 357                 if (callback)
 358                         grp->send_qllc_disc = 1;
 359         case MPCG_STATE_XID0IOWAIT:
 360                 fsm_deltimer(&grp->timer);
 361                 grp->outstanding_xid2 = 0;
 362                 grp->outstanding_xid7 = 0;
 363                 grp->outstanding_xid7_p2 = 0;
 364                 grp->saved_xid2 = NULL;
 365                 if (callback)
 366                         ctcm_open(dev);
 367                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 368                 break;
 369         case MPCG_STATE_READY:
 370                 /* XID exchanges completed after PORT was activated */
 371                 /* Link station already active                      */
 372                 /* Maybe timing issue...retry callback              */
 373                 grp->allocchan_callback_retries++;
 374                 if (grp->allocchan_callback_retries < 4) {
 375                         if (grp->allochanfunc)
 376                                 grp->allochanfunc(grp->port_num,
 377                                                   grp->group_max_buflen);
 378                 } else {
 379                         /* there are problems...bail out            */
 380                         /* there may be a state mismatch so restart */
 381                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 382                         grp->allocchan_callback_retries = 0;
 383                 }
 384                 break;
 385         }
 386
 387         return 0;
 388 }
 389 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 390
 391 /*
 392  * ctc_mpc_establish_connectivity
 393  *      (exported interface)
 394  */
 395 void ctc_mpc_establish_connectivity(int port_num,
 396                                 void (*callback)(int, int, int))
 397 {
 398         struct net_device *dev;
 399         struct mpc_group *grp;
 400         struct ctcm_priv *priv;
 401         struct channel *rch, *wch;
 402
 403         dev = ctcmpc_get_dev(port_num);
 404         if (dev == NULL)
 405                 return;
 406         priv = dev->ml_priv;
 407         grp = priv->mpcg;
 408         rch = priv->channel[CTCM_READ];
 409         wch = priv->channel[CTCM_WRITE];
 410
 411         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 412                         "%s(%s): state=%s",
 413                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 414
 415         grp->estconnfunc = callback;
 416         grp->port_num = port_num;
 417
 418         switch (fsm_getstate(grp->fsm)) {
 419         case MPCG_STATE_READY:
 420                 /* XID exchanges completed after PORT was activated */
 421                 /* Link station already active                      */
 422                 /* Maybe timing issue...retry callback              */
 423                 fsm_deltimer(&grp->timer);
 424                 grp->estconn_callback_retries++;
 425                 if (grp->estconn_callback_retries < 4) {
 426                         if (grp->estconnfunc) {
 427                                 grp->estconnfunc(grp->port_num, 0,
 428                                                 grp->group_max_buflen);
 429                                 grp->estconnfunc = NULL;
 430                         }
 431                 } else {
 432                         /* there are problems...bail out         */
 433                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 434                         grp->estconn_callback_retries = 0;
 435                 }
 436                 break;
 437         case MPCG_STATE_INOP:
 438         case MPCG_STATE_RESET:
 439                 /* MPC Group is not ready to start XID - min num of */
 440                 /* 1 read and 1 write channel have not been acquired*/
 441
 442                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 443                         "%s(%s): REJECTED - inactive channels",
 444                                         CTCM_FUNTAIL, dev->name);
 445                 if (grp->estconnfunc) {
 446                         grp->estconnfunc(grp->port_num, -1, 0);
 447                         grp->estconnfunc = NULL;
 448                 }
 449                 break;
 450         case MPCG_STATE_XID2INITW:
 451                 /* alloc channel was called but no XID exchange    */
 452                 /* has occurred. initiate xside XID exchange       */
 453                 /* make sure yside XID0 processing has not started */
 454
 455                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 456                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 457                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 458                                 "%s(%s): ABORT - PASSIVE XID",
 459                                         CTCM_FUNTAIL, dev->name);
 460                         break;
 461                 }
 462                 grp->send_qllc_disc = 1;
 463                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 464                 fsm_deltimer(&grp->timer);
 465                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 466                                                 MPCG_EVENT_TIMER, dev);
 467                 grp->outstanding_xid7 = 0;
 468                 grp->outstanding_xid7_p2 = 0;
 469                 grp->saved_xid2 = NULL;
 470                 if ((rch->in_mpcgroup) &&
 471                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 472                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 473                 else {
 474                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 475                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 476                                         CTCM_FUNTAIL, dev->name, rch->id);
 477                         if (grp->estconnfunc) {
 478                                 grp->estconnfunc(grp->port_num, -1, 0);
 479                                 grp->estconnfunc = NULL;
 480                         }
 481                         fsm_deltimer(&grp->timer);
 482                                 goto done;
 483                 }
 484                 if ((wch->in_mpcgroup) &&
 485                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 486                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 487                 else {
 488                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 489                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 490                                         CTCM_FUNTAIL, dev->name, wch->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                 break;
 499         case MPCG_STATE_XID0IOWAIT:
 500                 /* already in active XID negotiations */
 501         default:
 502                 break;
 503         }
 504
 505 done:
 506         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 507         return;
 508 }
 509 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 510
 511 /*
 512  * ctc_mpc_dealloc_ch
 513  *      (exported interface)
 514  */
 515 void ctc_mpc_dealloc_ch(int port_num)
 516 {
 517         struct net_device *dev;
 518         struct ctcm_priv *priv;
 519         struct mpc_group *grp;
 520
 521         dev = ctcmpc_get_dev(port_num);
 522         if (dev == NULL)
 523                 return;
 524         priv = dev->ml_priv;
 525         grp = priv->mpcg;
 526
 527         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 528                         "%s: %s: refcount = %d\n",
 529                         CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
 530
 531         fsm_deltimer(&priv->restart_timer);
 532         grp->channels_terminating = 0;
 533         fsm_deltimer(&grp->timer);
 534         grp->allochanfunc = NULL;
 535         grp->estconnfunc = NULL;
 536         grp->port_persist = 0;
 537         grp->send_qllc_disc = 0;
 538         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 539
 540         ctcm_close(dev);
 541         return;
 542 }
 543 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 544
 545 /*
 546  * ctc_mpc_flow_control
 547  *      (exported interface)
 548  */
 549 void ctc_mpc_flow_control(int port_num, int flowc)
 550 {
 551         struct ctcm_priv *priv;
 552         struct mpc_group *grp;
 553         struct net_device *dev;
 554         struct channel *rch;
 555         int mpcg_state;
 556
 557         dev = ctcmpc_get_dev(port_num);
 558         if (dev == NULL)
 559                 return;
 560         priv = dev->ml_priv;
 561         grp = priv->mpcg;
 562
 563         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 564                         "%s: %s: flowc = %d",
 565                                 CTCM_FUNTAIL, dev->name, flowc);
 566
 567         rch = priv->channel[CTCM_READ];
 568
 569         mpcg_state = fsm_getstate(grp->fsm);
 570         switch (flowc) {
 571         case 1:
 572                 if (mpcg_state == MPCG_STATE_FLOWC)
 573                         break;
 574                 if (mpcg_state == MPCG_STATE_READY) {
 575                         if (grp->flow_off_called == 1)
 576                                 grp->flow_off_called = 0;
 577                         else
 578                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 579                         break;
 580                 }
 581                 break;
 582         case 0:
 583                 if (mpcg_state == MPCG_STATE_FLOWC) {
 584                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 585                         /* ensure any data that has accumulated */
 586                         /* on the io_queue will now be sen t    */
 587                         tasklet_schedule(&rch->ch_tasklet);
 588                 }
 589                 /* possible race condition                      */
 590                 if (mpcg_state == MPCG_STATE_READY) {
 591                         grp->flow_off_called = 1;
 592                         break;
 593                 }
 594                 break;
 595         }
 596
 597 }
 598 EXPORT_SYMBOL(ctc_mpc_flow_control);
 599
 600 static int mpc_send_qllc_discontact(struct net_device *);
 601
 602 /*
 603  * helper function of ctcmpc_unpack_skb
 604 */
 605 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 606 {
 607         struct channel    *rch = mpcginfo->ch;
 608         struct net_device *dev = rch->netdev;
 609         struct ctcm_priv   *priv = dev->ml_priv;
 610         struct mpc_group  *grp = priv->mpcg;
 611         struct channel    *ch = priv->channel[CTCM_WRITE];
 612
 613         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 614         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 615
 616         grp->sweep_rsp_pend_num--;
 617
 618         if ((grp->sweep_req_pend_num == 0) &&
 619                         (grp->sweep_rsp_pend_num == 0)) {
 620                 fsm_deltimer(&ch->sweep_timer);
 621                 grp->in_sweep = 0;
 622                 rch->th_seq_num = 0x00;
 623                 ch->th_seq_num = 0x00;
 624                 ctcm_clear_busy_do(dev);
 625         }
 626
 627         kfree(mpcginfo);
 628
 629         return;
 630
 631 }
 632
 633 /*
 634  * helper function of mpc_rcvd_sweep_req
 635  * which is a helper of ctcmpc_unpack_skb
 636  */
 637 static void ctcmpc_send_sweep_resp(struct channel *rch)
 638 {
 639         struct net_device *dev = rch->netdev;
 640         struct ctcm_priv *priv = dev->ml_priv;
 641         struct mpc_group *grp = priv->mpcg;
 642         struct th_sweep *header;
 643         struct sk_buff *sweep_skb;
 644         struct channel *ch  = priv->channel[CTCM_WRITE];
 645
 646         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 647
 648         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 649         if (sweep_skb == NULL) {
 650                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 651                         "%s(%s): sweep_skb allocation ERROR\n",
 652                         CTCM_FUNTAIL, rch->id);
 653                 goto done;
 654         }
 655
 656         header = kmalloc(sizeof(struct th_sweep), gfp_type());
 657
 658         if (!header) {
 659                 dev_kfree_skb_any(sweep_skb);
 660                 goto done;
 661         }
 662
 663         header->th.th_seg       = 0x00 ;
 664         header->th.th_ch_flag   = TH_SWEEP_RESP;
 665         header->th.th_blk_flag  = 0x00;
 666         header->th.th_is_xid    = 0x00;
 667         header->th.th_seq_num   = 0x00;
 668         header->sw.th_last_seq  = ch->th_seq_num;
 669
 670         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 671
 672         kfree(header);
 673
 674         dev->trans_start = jiffies;
 675         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 676
 677         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 678
 679         return;
 680
 681 done:
 682         grp->in_sweep = 0;
 683         ctcm_clear_busy_do(dev);
 684         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 685
 686         return;
 687 }
 688
 689 /*
 690  * helper function of ctcmpc_unpack_skb
 691  */
 692 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 693 {
 694         struct channel    *rch     = mpcginfo->ch;
 695         struct net_device *dev     = rch->netdev;
 696         struct ctcm_priv  *priv = dev->ml_priv;
 697         struct mpc_group  *grp  = priv->mpcg;
 698         struct channel    *ch      = priv->channel[CTCM_WRITE];
 699
 700         if (do_debug)
 701                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 702                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 703
 704         if (grp->in_sweep == 0) {
 705                 grp->in_sweep = 1;
 706                 ctcm_test_and_set_busy(dev);
 707                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 708                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 709         }
 710
 711         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 712
 713         grp->sweep_req_pend_num--;
 714         ctcmpc_send_sweep_resp(ch);
 715         kfree(mpcginfo);
 716         return;
 717 }
 718
 719 /*
 720   * MPC Group Station FSM definitions
 721  */
 722 static const char *mpcg_event_names[] = {
 723         [MPCG_EVENT_INOP]       = "INOP Condition",
 724         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 725         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 726         [MPCG_EVENT_XID2]       = "XID2 Received",
 727         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 728         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 729         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 730         [MPCG_EVENT_DOIO]       = "XID DoIO",
 731 };
 732
 733 static const char *mpcg_state_names[] = {
 734         [MPCG_STATE_RESET]      = "Reset",
 735         [MPCG_STATE_INOP]       = "INOP",
 736         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 737         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 738         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 739         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 740         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 741         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 742         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 743         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 744         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 745         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 746         [MPCG_STATE_READY]      = "READY",
 747 };
 748
 749 /*
 750  * The MPC Group Station FSM
 751  *   22 events
 752  */
 753 static const fsm_node mpcg_fsm[] = {
 754         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 755         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 756         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 757
 758         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 759         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 760
 761         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 762         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 763         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 764         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 765         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 766
 767         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 768         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 769         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 770         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 771         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 772
 773         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 774         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 775         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 776         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 777         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 778         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 779         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 780
 781         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 782         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 783         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 784         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 785         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 786         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 787
 788         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 789         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 790         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 791         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 792         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 793         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 794
 795         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 796         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 797         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 798         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 799         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 800         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 801
 802         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 803         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 804         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 805         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 806         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 807         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 808         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 809
 810         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 811         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 812         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 813         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 814         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 815         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 816
 817         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 818         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 819 };
 820
 821 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 822
 823 /*
 824  * MPC Group Station FSM action
 825  * CTCM_PROTO_MPC only
 826  */
 827 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 828 {
 829         struct net_device *dev = arg;
 830         struct ctcm_priv *priv = dev->ml_priv;
 831         struct mpc_group *grp = priv->mpcg;
 832
 833         if (grp == NULL) {
 834                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 835                         "%s(%s): No MPC group",
 836                                 CTCM_FUNTAIL, dev->name);
 837                 return;
 838         }
 839
 840         fsm_deltimer(&grp->timer);
 841
 842         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 843                 priv->xid->xid2_flag2 = 0x00;
 844                 if (grp->estconnfunc) {
 845                         grp->estconnfunc(grp->port_num, 1,
 846                                         grp->group_max_buflen);
 847                         grp->estconnfunc = NULL;
 848                 } else if (grp->allochanfunc)
 849                         grp->send_qllc_disc = 1;
 850
 851                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 852                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 853                                 "%s(%s): fails",
 854                                         CTCM_FUNTAIL, dev->name);
 855                 return;
 856         }
 857
 858         grp->port_persist = 1;
 859         grp->out_of_sequence = 0;
 860         grp->estconn_called = 0;
 861
 862         tasklet_hi_schedule(&grp->mpc_tasklet2);
 863
 864         return;
 865 }
 866
 867 /*
 868  * helper of ctcm_init_netdevice
 869  * CTCM_PROTO_MPC only
 870  */
 871 void mpc_group_ready(unsigned long adev)
 872 {
 873         struct net_device *dev = (struct net_device *)adev;
 874         struct ctcm_priv *priv = dev->ml_priv;
 875         struct mpc_group *grp = priv->mpcg;
 876         struct channel *ch = NULL;
 877
 878         if (grp == NULL) {
 879                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 880                         "%s(%s): No MPC group",
 881                                 CTCM_FUNTAIL, dev->name);
 882                 return;
 883         }
 884
 885         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 886                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 887                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 888
 889         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 890
 891         /* Put up a read on the channel */
 892         ch = priv->channel[CTCM_READ];
 893         ch->pdu_seq = 0;
 894         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 895                         __func__, ch->pdu_seq);
 896
 897         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 898         /* Put the write channel in idle state */
 899         ch = priv->channel[CTCM_WRITE];
 900         if (ch->collect_len > 0) {
 901                 spin_lock(&ch->collect_lock);
 902                 ctcm_purge_skb_queue(&ch->collect_queue);
 903                 ch->collect_len = 0;
 904                 spin_unlock(&ch->collect_lock);
 905         }
 906         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 907         ctcm_clear_busy(dev);
 908
 909         if (grp->estconnfunc) {
 910                 grp->estconnfunc(grp->port_num, 0,
 911                                     grp->group_max_buflen);
 912                 grp->estconnfunc = NULL;
 913         } else  if (grp->allochanfunc)
 914                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 915
 916         grp->send_qllc_disc = 1;
 917         grp->changed_side = 0;
 918
 919         return;
 920
 921 }
 922
 923 /*
 924  * Increment the MPC Group Active Channel Counts
 925  * helper of dev_action (called from channel fsm)
 926  */
 927 void mpc_channel_action(struct channel *ch, int direction, int action)
 928 {
 929         struct net_device  *dev  = ch->netdev;
 930         struct ctcm_priv   *priv = dev->ml_priv;
 931         struct mpc_group   *grp  = priv->mpcg;
 932
 933         if (grp == NULL) {
 934                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 935                         "%s(%s): No MPC group",
 936                                 CTCM_FUNTAIL, dev->name);
 937                 return;
 938         }
 939
 940         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 941
 942         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 943                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 944                 "read=%i, write=%i\n", __func__, action,
 945                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 946                 grp->active_channels[CTCM_READ],
 947                 grp->active_channels[CTCM_WRITE]);
 948
 949         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 950                 grp->num_channel_paths++;
 951                 grp->active_channels[direction]++;
 952                 grp->outstanding_xid2++;
 953                 ch->in_mpcgroup = 1;
 954
 955                 if (ch->xid_skb != NULL)
 956                         dev_kfree_skb_any(ch->xid_skb);
 957
 958                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 959                                         GFP_ATOMIC | GFP_DMA);
 960                 if (ch->xid_skb == NULL) {
 961                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 962                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 963                                 CTCM_FUNTAIL, dev->name);
 964                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 965                         return;
 966                 }
 967                 ch->xid_skb_data = ch->xid_skb->data;
 968                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 969                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 970                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 971                 skb_put(ch->xid_skb, XID2_LENGTH);
 972                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 973                 ch->xid_skb->data = ch->xid_skb_data;
 974                 skb_reset_tail_pointer(ch->xid_skb);
 975                 ch->xid_skb->len = 0;
 976
 977                 memcpy(skb_put(ch->xid_skb, grp->xid_skb->len),
 978                                 grp->xid_skb->data,
 979                                 grp->xid_skb->len);
 980
 981                 ch->xid->xid2_dlc_type =
 982                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 983                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 984
 985                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 986                         ch->xid->xid2_buf_len = 0x00;
 987
 988                 ch->xid_skb->data = ch->xid_skb_data;
 989                 skb_reset_tail_pointer(ch->xid_skb);
 990                 ch->xid_skb->len = 0;
 991
 992                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 993
 994                 if ((grp->active_channels[CTCM_READ] > 0) &&
 995                     (grp->active_channels[CTCM_WRITE] > 0) &&
 996                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 997                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 998                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 999                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1000                                                 __func__, dev->name);
1001                 }
1002         } else if ((action == MPC_CHANNEL_REMOVE) &&
1003                         (ch->in_mpcgroup == 1)) {
1004                 ch->in_mpcgroup = 0;
1005                 grp->num_channel_paths--;
1006                 grp->active_channels[direction]--;
1007
1008                 if (ch->xid_skb != NULL)
1009                         dev_kfree_skb_any(ch->xid_skb);
1010                 ch->xid_skb = NULL;
1011
1012                 if (grp->channels_terminating)
1013                                         goto done;
1014
1015                 if (((grp->active_channels[CTCM_READ] == 0) &&
1016                                         (grp->active_channels[CTCM_WRITE] > 0))
1017                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1018                                         (grp->active_channels[CTCM_READ] > 0)))
1019                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1020         }
1021 done:
1022         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1023                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1024                 "read=%i, write=%i\n", __func__, action,
1025                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1026                 grp->active_channels[CTCM_READ],
1027                 grp->active_channels[CTCM_WRITE]);
1028
1029         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1030 }
1031
1032 /**
1033  * Unpack a just received skb and hand it over to
1034  * upper layers.
1035  * special MPC version of unpack_skb.
1036  *
1037  * ch           The channel where this skb has been received.
1038  * pskb         The received skb.
1039  */
1040 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1041 {
1042         struct net_device *dev  = ch->netdev;
1043         struct ctcm_priv *priv = dev->ml_priv;
1044         struct mpc_group *grp = priv->mpcg;
1045         struct pdu *curr_pdu;
1046         struct mpcg_info *mpcginfo;
1047         struct th_header *header = NULL;
1048         struct th_sweep *sweep = NULL;
1049         int pdu_last_seen = 0;
1050         __u32 new_len;
1051         struct sk_buff *skb;
1052         int skblen;
1053         int sendrc = 0;
1054
1055         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1056                         __func__, dev->name, smp_processor_id(), ch->id);
1057
1058         header = (struct th_header *)pskb->data;
1059         if ((header->th_seg == 0) &&
1060                 (header->th_ch_flag == 0) &&
1061                 (header->th_blk_flag == 0) &&
1062                 (header->th_seq_num == 0))
1063                 /* nothing for us */    goto done;
1064
1065         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1066         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1067         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1068
1069         pskb->dev = dev;
1070         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1071         skb_pull(pskb, TH_HEADER_LENGTH);
1072
1073         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1074                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1075                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1076                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1077                     (header->th_seq_num != ch->th_seq_num + 1) &&
1078                     (ch->th_seq_num != 0))) {
1079                         /* This is NOT the next segment         *
1080                          * we are not the correct race winner   *
1081                          * go away and let someone else win     *
1082                          * BUT..this only applies if xid negot  *
1083                          * is done                              *
1084                         */
1085                         grp->out_of_sequence += 1;
1086                         __skb_push(pskb, TH_HEADER_LENGTH);
1087                         skb_queue_tail(&ch->io_queue, pskb);
1088                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1089                                         "got:%08x\n", __func__,
1090                                 ch->th_seq_num + 1, header->th_seq_num);
1091
1092                         return;
1093                 }
1094                 grp->out_of_sequence = 0;
1095                 ch->th_seq_num = header->th_seq_num;
1096
1097                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1098                                         __func__, ch->th_seq_num);
1099
1100                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1101                                         goto done;
1102                 while ((pskb->len > 0) && !pdu_last_seen) {
1103                         curr_pdu = (struct pdu *)pskb->data;
1104
1105                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1106                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1107                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1108                                                 __func__, pskb->len);
1109
1110                         skb_pull(pskb, PDU_HEADER_LENGTH);
1111
1112                         if (curr_pdu->pdu_flag & PDU_LAST)
1113                                 pdu_last_seen = 1;
1114                         if (curr_pdu->pdu_flag & PDU_CNTL)
1115                                 pskb->protocol = htons(ETH_P_SNAP);
1116                         else
1117                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1118
1119                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1120                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1121                                         "%s(%s): Dropping packet with "
1122                                         "illegal siize %d",
1123                                         CTCM_FUNTAIL, dev->name, pskb->len);
1124
1125                                 priv->stats.rx_dropped++;
1126                                 priv->stats.rx_length_errors++;
1127                                         goto done;
1128                         }
1129                         skb_reset_mac_header(pskb);
1130                         new_len = curr_pdu->pdu_offset;
1131                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1132                                                 __func__, new_len);
1133                         if ((new_len == 0) || (new_len > pskb->len)) {
1134                                 /* should never happen              */
1135                                 /* pskb len must be hosed...bail out */
1136                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137                                         "%s(%s): non valid pdu_offset: %04x",
1138                                         /* "data may be lost", */
1139                                         CTCM_FUNTAIL, dev->name, new_len);
1140                                 goto done;
1141                         }
1142                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1143
1144                         if (!skb) {
1145                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1146                                         "%s(%s): MEMORY allocation error",
1147                                                 CTCM_FUNTAIL, dev->name);
1148                                 priv->stats.rx_dropped++;
1149                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1150                                                 goto done;
1151                         }
1152                         memcpy(skb_put(skb, new_len), pskb->data, new_len);
1153
1154                         skb_reset_mac_header(skb);
1155                         skb->dev = pskb->dev;
1156                         skb->protocol = pskb->protocol;
1157                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1158                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1159                         ch->pdu_seq++;
1160
1161                         if (do_debug_data) {
1162                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1163                                                 __func__, ch->pdu_seq);
1164                                 ctcm_pr_debug("%s: skb:%0lx "
1165                                         "skb len: %d \n", __func__,
1166                                         (unsigned long)skb, skb->len);
1167                                 ctcm_pr_debug("%s: up to 32 bytes "
1168                                         "of pdu_data sent\n", __func__);
1169                                 ctcmpc_dump32((char *)skb->data, skb->len);
1170                         }
1171
1172                         skblen = skb->len;
1173                         sendrc = netif_rx(skb);
1174                         priv->stats.rx_packets++;
1175                         priv->stats.rx_bytes += skblen;
1176                         skb_pull(pskb, new_len); /* point to next PDU */
1177                 }
1178         } else {
1179                 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1180                 if (mpcginfo == NULL)
1181                                         goto done;
1182
1183                 mpcginfo->ch = ch;
1184                 mpcginfo->th = header;
1185                 mpcginfo->skb = pskb;
1186                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1187                                         __func__);
1188                 /*  it's a sweep?   */
1189                 sweep = (struct th_sweep *)pskb->data;
1190                 mpcginfo->sweep = sweep;
1191                 if (header->th_ch_flag == TH_SWEEP_REQ)
1192                         mpc_rcvd_sweep_req(mpcginfo);
1193                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1194                         mpc_rcvd_sweep_resp(mpcginfo);
1195                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1196                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1197                         skb_pull(pskb, XID2_LENGTH);
1198                         mpcginfo->xid = thisxid;
1199                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1200                 } else if (header->th_blk_flag == TH_DISCONTACT)
1201                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1202                 else if (header->th_seq_num != 0) {
1203                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1204                                 "%s(%s): control pkt expected\n",
1205                                                 CTCM_FUNTAIL, dev->name);
1206                         priv->stats.rx_dropped++;
1207                         /* mpcginfo only used for non-data transfers */
1208                         kfree(mpcginfo);
1209                         if (do_debug_data)
1210                                 ctcmpc_dump_skb(pskb, -8);
1211                 }
1212         }
1213 done:
1214
1215         dev_kfree_skb_any(pskb);
1216         if (sendrc == NET_RX_DROP) {
1217                 dev_warn(&dev->dev,
1218                         "The network backlog for %s is exceeded, "
1219                         "package dropped\n", __func__);
1220                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1221         }
1222
1223         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1224                         __func__, dev->name, ch, ch->id);
1225 }
1226
1227 /**
1228  * tasklet helper for mpc's skb unpacking.
1229  *
1230  * ch           The channel to work on.
1231  * Allow flow control back pressure to occur here.
1232  * Throttling back channel can result in excessive
1233  * channel inactivity and system deact of channel
1234  */
1235 void ctcmpc_bh(unsigned long thischan)
1236 {
1237         struct channel    *ch   = (struct channel *)thischan;
1238         struct sk_buff    *skb;
1239         struct net_device *dev  = ch->netdev;
1240         struct ctcm_priv  *priv = dev->ml_priv;
1241         struct mpc_group  *grp  = priv->mpcg;
1242
1243         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1244                dev->name, smp_processor_id(), __func__, ch->id);
1245         /* caller has requested driver to throttle back */
1246         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1247                         (skb = skb_dequeue(&ch->io_queue))) {
1248                 ctcmpc_unpack_skb(ch, skb);
1249                 if (grp->out_of_sequence > 20) {
1250                         /* assume data loss has occurred if */
1251                         /* missing seq_num for extended     */
1252                         /* period of time                   */
1253                         grp->out_of_sequence = 0;
1254                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1255                         break;
1256                 }
1257                 if (skb == skb_peek(&ch->io_queue))
1258                         break;
1259         }
1260         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1261                         __func__, dev->name, ch, ch->id);
1262         return;
1263 }
1264
1265 /*
1266  *  MPC Group Initializations
1267  */
1268 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1269 {
1270         struct mpc_group *grp;
1271
1272         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1273                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1274
1275         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1276         if (grp == NULL)
1277                 return NULL;
1278
1279         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1280                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1281                         mpcg_fsm_len, GFP_KERNEL);
1282         if (grp->fsm == NULL) {
1283                 kfree(grp);
1284                 return NULL;
1285         }
1286
1287         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1288         fsm_settimer(grp->fsm, &grp->timer);
1289
1290         grp->xid_skb =
1291                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1292         if (grp->xid_skb == NULL) {
1293                 kfree_fsm(grp->fsm);
1294                 kfree(grp);
1295                 return NULL;
1296         }
1297         /*  base xid for all channels in group  */
1298         grp->xid_skb_data = grp->xid_skb->data;
1299         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1300         memcpy(skb_put(grp->xid_skb, TH_HEADER_LENGTH),
1301                         &thnorm, TH_HEADER_LENGTH);
1302
1303         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1304         memcpy(skb_put(grp->xid_skb, XID2_LENGTH), &init_xid, XID2_LENGTH);
1305         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1306         grp->xid->xid2_sender_id = jiffies;
1307
1308         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1309         memcpy(skb_put(grp->xid_skb, 4), "VTAM", 4);
1310
1311         grp->rcvd_xid_skb =
1312                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1313         if (grp->rcvd_xid_skb == NULL) {
1314                 kfree_fsm(grp->fsm);
1315                 dev_kfree_skb(grp->xid_skb);
1316                 kfree(grp);
1317                 return NULL;
1318         }
1319         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1320         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1321         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH),
1322                         &thnorm, TH_HEADER_LENGTH);
1323         grp->saved_xid2 = NULL;
1324         priv->xid = grp->xid;
1325         priv->mpcg = grp;
1326         return grp;
1327 }
1328
1329 /*
1330  * The MPC Group Station FSM
1331  */
1332
1333 /*
1334  * MPC Group Station FSM actions
1335  * CTCM_PROTO_MPC only
1336  */
1337
1338 /**
1339  * NOP action for statemachines
1340  */
1341 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1342 {
1343 }
1344
1345 /*
1346  * invoked when the device transitions to dev_stopped
1347  * MPC will stop each individual channel if a single XID failure
1348  * occurs, or will intitiate all channels be stopped if a GROUP
1349  * level failure occurs.
1350  */
1351 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1352 {
1353         struct net_device  *dev = arg;
1354         struct ctcm_priv    *priv;
1355         struct mpc_group *grp;
1356         struct channel *wch;
1357
1358         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1359
1360         priv  = dev->ml_priv;
1361         grp =  priv->mpcg;
1362         grp->flow_off_called = 0;
1363         fsm_deltimer(&grp->timer);
1364         if (grp->channels_terminating)
1365                         return;
1366
1367         grp->channels_terminating = 1;
1368         grp->saved_state = fsm_getstate(grp->fsm);
1369         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1370         if (grp->saved_state > MPCG_STATE_XID7INITF)
1371                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1372                         "%s(%s): MPC GROUP INOPERATIVE",
1373                                 CTCM_FUNTAIL, dev->name);
1374         if ((grp->saved_state != MPCG_STATE_RESET) ||
1375                 /* dealloc_channel has been called */
1376                 (grp->port_persist == 0))
1377                 fsm_deltimer(&priv->restart_timer);
1378
1379         wch = priv->channel[CTCM_WRITE];
1380
1381         switch (grp->saved_state) {
1382         case MPCG_STATE_RESET:
1383         case MPCG_STATE_INOP:
1384         case MPCG_STATE_XID2INITW:
1385         case MPCG_STATE_XID0IOWAIT:
1386         case MPCG_STATE_XID2INITX:
1387         case MPCG_STATE_XID7INITW:
1388         case MPCG_STATE_XID7INITX:
1389         case MPCG_STATE_XID0IOWAIX:
1390         case MPCG_STATE_XID7INITI:
1391         case MPCG_STATE_XID7INITZ:
1392         case MPCG_STATE_XID7INITF:
1393                 break;
1394         case MPCG_STATE_FLOWC:
1395         case MPCG_STATE_READY:
1396         default:
1397                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1398         }
1399
1400         grp->xid2_tgnum = 0;
1401         grp->group_max_buflen = 0;  /*min of all received */
1402         grp->outstanding_xid2 = 0;
1403         grp->outstanding_xid7 = 0;
1404         grp->outstanding_xid7_p2 = 0;
1405         grp->saved_xid2 = NULL;
1406         grp->xidnogood = 0;
1407         grp->changed_side = 0;
1408
1409         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1410         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1411         grp->rcvd_xid_skb->len = 0;
1412         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1413         memcpy(skb_put(grp->rcvd_xid_skb, TH_HEADER_LENGTH), &thnorm,
1414                TH_HEADER_LENGTH);
1415
1416         if (grp->send_qllc_disc == 1) {
1417                 grp->send_qllc_disc = 0;
1418                 mpc_send_qllc_discontact(dev);
1419         }
1420
1421         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1422         /* This can result in INOP of VTAM PU due to halting of  */
1423         /* outstanding IO which causes a sense to be returned    */
1424         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1425         /* become unreachable without manual intervention        */
1426         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1427                 grp->alloc_called = 0;
1428                 fsm_deltimer(&priv->restart_timer);
1429                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1430                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1431                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1432                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1433                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1434                                         CTCM_FUNTAIL, dev->name);
1435         } else {
1436                 fsm_deltimer(&priv->restart_timer);
1437                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1438                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1439                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1440                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1441                                                 CTCM_FUNTAIL, dev->name);
1442         }
1443 }
1444
1445 /**
1446  * Handle mpc group  action timeout.
1447  * MPC Group Station FSM action
1448  * CTCM_PROTO_MPC only
1449  *
1450  * fi           An instance of an mpc_group fsm.
1451  * event        The event, just happened.
1452  * arg          Generic pointer, casted from net_device * upon call.
1453  */
1454 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1455 {
1456         struct net_device *dev = arg;
1457         struct ctcm_priv *priv;
1458         struct mpc_group *grp;
1459         struct channel *wch;
1460         struct channel *rch;
1461
1462         priv = dev->ml_priv;
1463         grp = priv->mpcg;
1464         wch = priv->channel[CTCM_WRITE];
1465         rch = priv->channel[CTCM_READ];
1466
1467         switch (fsm_getstate(grp->fsm)) {
1468         case MPCG_STATE_XID2INITW:
1469                 /* Unless there is outstanding IO on the  */
1470                 /* channel just return and wait for ATTN  */
1471                 /* interrupt to begin XID negotiations    */
1472                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1473                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1474                         break;
1475         default:
1476                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1477         }
1478
1479         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1480                         "%s: dev=%s exit",
1481                         CTCM_FUNTAIL, dev->name);
1482         return;
1483 }
1484
1485 /*
1486  * MPC Group Station FSM action
1487  * CTCM_PROTO_MPC only
1488  */
1489 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1490 {
1491         struct mpcg_info   *mpcginfo   = arg;
1492         struct channel     *ch         = mpcginfo->ch;
1493         struct net_device  *dev;
1494         struct ctcm_priv   *priv;
1495         struct mpc_group   *grp;
1496
1497         if (ch) {
1498                 dev = ch->netdev;
1499                 if (dev) {
1500                         priv = dev->ml_priv;
1501                         if (priv) {
1502                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1503                                         "%s: %s: %s\n",
1504                                         CTCM_FUNTAIL, dev->name, ch->id);
1505                                 grp = priv->mpcg;
1506                                 grp->send_qllc_disc = 1;
1507                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1508                         }
1509                 }
1510         }
1511
1512         return;
1513 }
1514
1515 /*
1516  * MPC Group Station - not part of FSM
1517  * CTCM_PROTO_MPC only
1518  * called from add_channel in ctcm_main.c
1519  */
1520 void mpc_action_send_discontact(unsigned long thischan)
1521 {
1522         int rc;
1523         struct channel  *ch = (struct channel *)thischan;
1524         unsigned long   saveflags = 0;
1525
1526         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1527         rc = ccw_device_start(ch->cdev, &ch->ccw[15],
1528                                         (unsigned long)ch, 0xff, 0);
1529         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1530
1531         if (rc != 0) {
1532                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1533         }
1534
1535         return;
1536 }
1537
1538
1539 /*
1540  * helper function of mpc FSM
1541  * CTCM_PROTO_MPC only
1542  * mpc_action_rcvd_xid7
1543 */
1544 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1545 {
1546         struct channel     *ch   = mpcginfo->ch;
1547         struct net_device  *dev  = ch->netdev;
1548         struct ctcm_priv   *priv = dev->ml_priv;
1549         struct mpc_group   *grp  = priv->mpcg;
1550         struct xid2        *xid  = mpcginfo->xid;
1551         int     rc       = 0;
1552         __u64   our_id   = 0;
1553         __u64   their_id = 0;
1554         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1555
1556         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1557
1558         if (xid == NULL) {
1559                 rc = 1;
1560                 /* XID REJECTED: xid == NULL */
1561                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1562                         "%s(%s): xid = NULL",
1563                                 CTCM_FUNTAIL, ch->id);
1564                         goto done;
1565         }
1566
1567         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1568
1569         /*the received direction should be the opposite of ours  */
1570         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1571                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1572                 rc = 2;
1573                 /* XID REJECTED: r/w channel pairing mismatch */
1574                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1575                         "%s(%s): r/w channel pairing mismatch",
1576                                 CTCM_FUNTAIL, ch->id);
1577                         goto done;
1578         }
1579
1580         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1581                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1582                                 grp->group_max_buflen, xid->xid2_buf_len);
1583
1584                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1585                                                 xid->xid2_buf_len - len)
1586                         grp->group_max_buflen = xid->xid2_buf_len - len;
1587         }
1588
1589         if (grp->saved_xid2 == NULL) {
1590                 grp->saved_xid2 =
1591                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1592
1593                 memcpy(skb_put(grp->rcvd_xid_skb,
1594                                         XID2_LENGTH), xid, XID2_LENGTH);
1595                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1596
1597                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1598                 grp->rcvd_xid_skb->len = 0;
1599
1600                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1601                 our_id = (__u64)priv->xid->xid2_adj_id;
1602                 our_id = our_id << 32;
1603                 our_id = our_id + priv->xid->xid2_sender_id;
1604                 their_id = (__u64)xid->xid2_adj_id;
1605                 their_id = their_id << 32;
1606                 their_id = their_id + xid->xid2_sender_id;
1607                 /* lower id assume the xside role */
1608                 if (our_id < their_id) {
1609                         grp->roll = XSIDE;
1610                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1611                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1612                                         CTCM_FUNTAIL, ch->id);
1613                 } else {
1614                         grp->roll = YSIDE;
1615                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1616                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1617                                         CTCM_FUNTAIL, ch->id);
1618                 }
1619
1620         } else {
1621                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1622                         rc = 3;
1623                         /* XID REJECTED: xid flag byte4 mismatch */
1624                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1625                                 "%s(%s): xid flag byte4 mismatch",
1626                                         CTCM_FUNTAIL, ch->id);
1627                 }
1628                 if (xid->xid2_flag2 == 0x40) {
1629                         rc = 4;
1630                         /* XID REJECTED - xid NOGOOD */
1631                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1632                                 "%s(%s): xid NOGOOD",
1633                                         CTCM_FUNTAIL, ch->id);
1634                 }
1635                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1636                         rc = 5;
1637                         /* XID REJECTED - Adjacent Station ID Mismatch */
1638                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1639                                 "%s(%s): Adjacent Station ID Mismatch",
1640                                         CTCM_FUNTAIL, ch->id);
1641                 }
1642                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1643                         rc = 6;
1644                         /* XID REJECTED - Sender Address Mismatch */
1645                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1646                                 "%s(%s): Sender Address Mismatch",
1647                                         CTCM_FUNTAIL, ch->id);
1648                 }
1649         }
1650 done:
1651         if (rc) {
1652                 dev_warn(&dev->dev,
1653                         "The XID used in the MPC protocol is not valid, "
1654                         "rc = %d\n", rc);
1655                 priv->xid->xid2_flag2 = 0x40;
1656                 grp->saved_xid2->xid2_flag2 = 0x40;
1657         }
1658
1659         return rc;
1660 }
1661
1662 /*
1663  * MPC Group Station FSM action
1664  * CTCM_PROTO_MPC only
1665  */
1666 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1667 {
1668         struct channel *ch = arg;
1669         int rc = 0;
1670         int gotlock = 0;
1671         unsigned long saveflags = 0;    /* avoids compiler warning with
1672                                            spin_unlock_irqrestore */
1673
1674         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1675                         __func__, smp_processor_id(), ch, ch->id);
1676
1677         if (ctcm_checkalloc_buffer(ch))
1678                                         goto done;
1679
1680         /*
1681          * skb data-buffer referencing:
1682          */
1683         ch->trans_skb->data = ch->trans_skb_data;
1684         skb_reset_tail_pointer(ch->trans_skb);
1685         ch->trans_skb->len = 0;
1686         /* result of the previous 3 statements is NOT always
1687          * already set after ctcm_checkalloc_buffer
1688          * because of possible reuse of the trans_skb
1689          */
1690         memset(ch->trans_skb->data, 0, 16);
1691         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1692         /* check is main purpose here: */
1693         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1694         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1695         /* check is main purpose here: */
1696         skb_put(ch->trans_skb, XID2_LENGTH);
1697         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1698         /* cleanup back to startpoint */
1699         ch->trans_skb->data = ch->trans_skb_data;
1700         skb_reset_tail_pointer(ch->trans_skb);
1701         ch->trans_skb->len = 0;
1702
1703         /* non-checking rewrite of above skb data-buffer referencing: */
1704         /*
1705         memset(ch->trans_skb->data, 0, 16);
1706         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1707         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1708         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1709          */
1710
1711         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1712         ch->ccw[8].count        = 0;
1713         ch->ccw[8].cda          = 0x00;
1714
1715         if (!(ch->xid_th && ch->xid && ch->xid_id))
1716                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1717                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1718                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1719
1720         if (side == XSIDE) {
1721                 /* mpc_action_xside_xid */
1722                 if (ch->xid_th == NULL)
1723                                 goto done;
1724                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1725                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1726                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1727                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1728
1729                 if (ch->xid == NULL)
1730                                 goto done;
1731                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1732                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1733                 ch->ccw[10].count       = XID2_LENGTH;
1734                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1735
1736                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1737                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1738                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1739                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1740
1741                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1742                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1743                 ch->ccw[12].count       = XID2_LENGTH;
1744                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1745
1746                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1747                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1748
1749         } else { /* side == YSIDE : mpc_action_yside_xid */
1750                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1751                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1752                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1753                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1754
1755                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1756                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1757                 ch->ccw[10].count       = XID2_LENGTH;
1758                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1759
1760                 if (ch->xid_th == NULL)
1761                                 goto done;
1762                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1763                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1764                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1765                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1766
1767                 if (ch->xid == NULL)
1768                                 goto done;
1769                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1770                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1771                 ch->ccw[12].count       = XID2_LENGTH;
1772                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1773
1774                 if (ch->xid_id == NULL)
1775                                 goto done;
1776                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1777                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1778
1779         }
1780         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1781         ch->ccw[13].count       = 4;
1782
1783         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1784         ch->ccw[14].flags       = CCW_FLAG_SLI;
1785         ch->ccw[14].count       = 0;
1786         ch->ccw[14].cda         = 0;
1787
1788         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1789         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1790         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1791         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1792
1793         if (!in_irq()) {
1794                          /* Such conditional locking is a known problem for
1795                           * sparse because its static undeterministic.
1796                           * Warnings should be ignored here. */
1797                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1798                 gotlock = 1;
1799         }
1800
1801         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1802         rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1803                                 (unsigned long)ch, 0xff, 0);
1804
1805         if (gotlock)    /* see remark above about conditional locking */
1806                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1807
1808         if (rc != 0) {
1809                 ctcm_ccw_check_rc(ch, rc,
1810                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1811         }
1812
1813 done:
1814         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1815                                 __func__, ch, ch->id);
1816         return;
1817
1818 }
1819
1820 /*
1821  * MPC Group Station FSM action
1822  * CTCM_PROTO_MPC only
1823  */
1824 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1825 {
1826         mpc_action_side_xid(fsm, arg, XSIDE);
1827 }
1828
1829 /*
1830  * MPC Group Station FSM action
1831  * CTCM_PROTO_MPC only
1832  */
1833 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1834 {
1835         mpc_action_side_xid(fsm, arg, YSIDE);
1836 }
1837
1838 /*
1839  * MPC Group Station FSM action
1840  * CTCM_PROTO_MPC only
1841  */
1842 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1843 {
1844         struct channel     *ch   = arg;
1845         struct net_device  *dev  = ch->netdev;
1846         struct ctcm_priv   *priv = dev->ml_priv;
1847         struct mpc_group   *grp  = priv->mpcg;
1848
1849         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1850                         __func__, smp_processor_id(), ch, ch->id);
1851
1852         if (ch->xid == NULL) {
1853                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1854                         "%s(%s): ch->xid == NULL",
1855                                 CTCM_FUNTAIL, dev->name);
1856                 return;
1857         }
1858
1859         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1860
1861         ch->xid->xid2_option =  XID2_0;
1862
1863         switch (fsm_getstate(grp->fsm)) {
1864         case MPCG_STATE_XID2INITW:
1865         case MPCG_STATE_XID2INITX:
1866                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1867                 break;
1868         case MPCG_STATE_XID0IOWAIT:
1869         case MPCG_STATE_XID0IOWAIX:
1870                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1871                 break;
1872         }
1873
1874         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1875
1876         return;
1877 }
1878
1879 /*
1880  * MPC Group Station FSM action
1881  * CTCM_PROTO_MPC only
1882 */
1883 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1884 {
1885         struct net_device *dev = arg;
1886         struct ctcm_priv  *priv = dev->ml_priv;
1887         struct mpc_group  *grp  = NULL;
1888         int direction;
1889         int send = 0;
1890
1891         if (priv)
1892                 grp = priv->mpcg;
1893         if (grp == NULL)
1894                 return;
1895
1896         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1897                 struct channel *ch = priv->channel[direction];
1898                 struct xid2 *thisxid = ch->xid;
1899                 ch->xid_skb->data = ch->xid_skb_data;
1900                 skb_reset_tail_pointer(ch->xid_skb);
1901                 ch->xid_skb->len = 0;
1902                 thisxid->xid2_option = XID2_7;
1903                 send = 0;
1904
1905                 /* xid7 phase 1 */
1906                 if (grp->outstanding_xid7_p2 > 0) {
1907                         if (grp->roll == YSIDE) {
1908                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1909                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1910                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1911                                         memcpy(skb_put(ch->xid_skb,
1912                                                         TH_HEADER_LENGTH),
1913                                                &thdummy, TH_HEADER_LENGTH);
1914                                         send = 1;
1915                                 }
1916                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1917                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1918                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1919                                         memcpy(skb_put(ch->xid_skb,
1920                                                        TH_HEADER_LENGTH),
1921                                                &thnorm, TH_HEADER_LENGTH);
1922                                         send = 1;
1923                         }
1924                 } else {
1925                         /* xid7 phase 2 */
1926                         if (grp->roll == YSIDE) {
1927                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1928                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1929                                         memcpy(skb_put(ch->xid_skb,
1930                                                        TH_HEADER_LENGTH),
1931                                                &thnorm, TH_HEADER_LENGTH);
1932                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1933                                         send = 1;
1934                                 }
1935                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1936                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1937                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1938                                 memcpy(skb_put(ch->xid_skb, TH_HEADER_LENGTH),
1939                                                 &thdummy, TH_HEADER_LENGTH);
1940                                 send = 1;
1941                         }
1942                 }
1943
1944                 if (send)
1945                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1946         }
1947
1948         return;
1949 }
1950
1951 /*
1952  * MPC Group Station FSM action
1953  * CTCM_PROTO_MPC only
1954  */
1955 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1956 {
1957
1958         struct mpcg_info   *mpcginfo  = arg;
1959         struct channel     *ch   = mpcginfo->ch;
1960         struct net_device  *dev  = ch->netdev;
1961         struct ctcm_priv   *priv = dev->ml_priv;
1962         struct mpc_group   *grp  = priv->mpcg;
1963
1964         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1965                         __func__, ch->id, grp->outstanding_xid2,
1966                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1967
1968         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1969                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1970
1971         grp->outstanding_xid2--;
1972         grp->outstanding_xid7++;
1973         grp->outstanding_xid7_p2++;
1974
1975         /* must change state before validating xid to */
1976         /* properly handle interim interrupts received*/
1977         switch (fsm_getstate(grp->fsm)) {
1978         case MPCG_STATE_XID2INITW:
1979                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1980                 mpc_validate_xid(mpcginfo);
1981                 break;
1982         case MPCG_STATE_XID0IOWAIT:
1983                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1984                 mpc_validate_xid(mpcginfo);
1985                 break;
1986         case MPCG_STATE_XID2INITX:
1987                 if (grp->outstanding_xid2 == 0) {
1988                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1989                         mpc_validate_xid(mpcginfo);
1990                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991                 }
1992                 break;
1993         case MPCG_STATE_XID0IOWAIX:
1994                 if (grp->outstanding_xid2 == 0) {
1995                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1996                         mpc_validate_xid(mpcginfo);
1997                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1998                 }
1999                 break;
2000         }
2001         kfree(mpcginfo);
2002
2003         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
2004                 __func__, ch->id, grp->outstanding_xid2,
2005                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
2006         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2007                 __func__, ch->id,
2008                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2009         return;
2010
2011 }
2012
2013
2014 /*
2015  * MPC Group Station FSM action
2016  * CTCM_PROTO_MPC only
2017  */
2018 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2019 {
2020         struct mpcg_info   *mpcginfo   = arg;
2021         struct channel     *ch         = mpcginfo->ch;
2022         struct net_device  *dev        = ch->netdev;
2023         struct ctcm_priv   *priv    = dev->ml_priv;
2024         struct mpc_group   *grp     = priv->mpcg;
2025
2026         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2027                 __func__, smp_processor_id(), ch, ch->id);
2028         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2029                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2030
2031         grp->outstanding_xid7--;
2032         ch->xid_skb->data = ch->xid_skb_data;
2033         skb_reset_tail_pointer(ch->xid_skb);
2034         ch->xid_skb->len = 0;
2035
2036         switch (fsm_getstate(grp->fsm)) {
2037         case MPCG_STATE_XID7INITI:
2038                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2039                 mpc_validate_xid(mpcginfo);
2040                 break;
2041         case MPCG_STATE_XID7INITW:
2042                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2043                 mpc_validate_xid(mpcginfo);
2044                 break;
2045         case MPCG_STATE_XID7INITZ:
2046         case MPCG_STATE_XID7INITX:
2047                 if (grp->outstanding_xid7 == 0) {
2048                         if (grp->outstanding_xid7_p2 > 0) {
2049                                 grp->outstanding_xid7 =
2050                                         grp->outstanding_xid7_p2;
2051                                 grp->outstanding_xid7_p2 = 0;
2052                         } else
2053                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2054
2055                         mpc_validate_xid(mpcginfo);
2056                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2057                         break;
2058                 }
2059                 mpc_validate_xid(mpcginfo);
2060                 break;
2061         }
2062         kfree(mpcginfo);
2063         return;
2064 }
2065
2066 /*
2067  * mpc_action helper of an MPC Group Station FSM action
2068  * CTCM_PROTO_MPC only
2069  */
2070 static int mpc_send_qllc_discontact(struct net_device *dev)
2071 {
2072         __u32   new_len = 0;
2073         struct sk_buff   *skb;
2074         struct qllc      *qllcptr;
2075         struct ctcm_priv *priv = dev->ml_priv;
2076         struct mpc_group *grp = priv->mpcg;
2077
2078         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2079                 __func__, mpcg_state_names[grp->saved_state]);
2080
2081         switch (grp->saved_state) {
2082         /*
2083          * establish conn callback function is
2084          * preferred method to report failure
2085          */
2086         case MPCG_STATE_XID0IOWAIT:
2087         case MPCG_STATE_XID0IOWAIX:
2088         case MPCG_STATE_XID7INITI:
2089         case MPCG_STATE_XID7INITZ:
2090         case MPCG_STATE_XID2INITW:
2091         case MPCG_STATE_XID2INITX:
2092         case MPCG_STATE_XID7INITW:
2093         case MPCG_STATE_XID7INITX:
2094                 if (grp->estconnfunc) {
2095                         grp->estconnfunc(grp->port_num, -1, 0);
2096                         grp->estconnfunc = NULL;
2097                         break;
2098                 }
2099         case MPCG_STATE_FLOWC:
2100         case MPCG_STATE_READY:
2101                 grp->send_qllc_disc = 2;
2102                 new_len = sizeof(struct qllc);
2103                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2104                 if (qllcptr == NULL) {
2105                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2106                                 "%s(%s): qllcptr allocation error",
2107                                                 CTCM_FUNTAIL, dev->name);
2108                         return -ENOMEM;
2109                 }
2110
2111                 qllcptr->qllc_address = 0xcc;
2112                 qllcptr->qllc_commands = 0x03;
2113
2114                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2115
2116                 if (skb == NULL) {
2117                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2118                                 "%s(%s): skb allocation error",
2119                                                 CTCM_FUNTAIL, dev->name);
2120                         priv->stats.rx_dropped++;
2121                         kfree(qllcptr);
2122                         return -ENOMEM;
2123                 }
2124
2125                 memcpy(skb_put(skb, new_len), qllcptr, new_len);
2126                 kfree(qllcptr);
2127
2128                 if (skb_headroom(skb) < 4) {
2129                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2130                                 "%s(%s): skb_headroom error",
2131                                                 CTCM_FUNTAIL, dev->name);
2132                         dev_kfree_skb_any(skb);
2133                         return -ENOMEM;
2134                 }
2135
2136                 *((__u32 *)skb_push(skb, 4)) =
2137                         priv->channel[CTCM_READ]->pdu_seq;
2138                 priv->channel[CTCM_READ]->pdu_seq++;
2139                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2140                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2141
2142                 /* receipt of CC03 resets anticipated sequence number on
2143                       receiving side */
2144                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2145                 skb_reset_mac_header(skb);
2146                 skb->dev = dev;
2147                 skb->protocol = htons(ETH_P_SNAP);
2148                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2149
2150                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2151
2152                 netif_rx(skb);
2153                 break;
2154         default:
2155                 break;
2156
2157         }
2158
2159         return 0;
2160 }
2161 /* --- This is the END my friend --- */
2162