drivers/s390/net/ctcm_mpc.c

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