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>
  47 #include <linux/bitops.h>
  48 #include <linux/uaccess.h>
  49 #include <linux/wait.h>
  50 #include <linux/moduleparam.h>
  51 #include <asm/ccwdev.h>
  52 #include <asm/ccwgroup.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                         scnprintf(addr, sizeof(addr), "%16.16llx", (__u64)rptr);
 148
 149                         scnprintf(boff, sizeof(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                 scnprintf(tbuf, sizeof(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                                 scnprintf(tdup, sizeof(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                         scnprintf(tdup, sizeof(tdup),
 201                                   "Duplicate as above to %s", addr);
 202                         ctcm_pr_debug("                --- %s ---\n", tdup);
 203                 }
 204                 ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 205                                         addr, boff, bhex, basc);
 206         } else {
 207                 if (dup >= 1) {
 208                         scnprintf(tdup, sizeof(tdup),
 209                                   "Duplicate as above to %s", addr);
 210                         ctcm_pr_debug("                --- %s ---\n", tdup);
 211                 }
 212                 if (dup != 0) {
 213                         ctcm_pr_debug("   %s (+%s) : %s  [%s]\n",
 214                                 addr, boff, bhex, basc);
 215                 }
 216         }
 217
 218         return;
 219
 220 }   /*   end of ctcmpc_dumpit  */
 221 #endif
 222
 223 #ifdef DEBUGDATA
 224 /*
 225  * Dump header and first 16 bytes of an sk_buff for debugging purposes.
 226  *
 227  * skb          The sk_buff to dump.
 228  * offset       Offset relative to skb-data, where to start the dump.
 229  */
 230 void ctcmpc_dump_skb(struct sk_buff *skb, int offset)
 231 {
 232         __u8 *p = skb->data;
 233         struct th_header *header;
 234         struct pdu *pheader;
 235         int bl = skb->len;
 236         int i;
 237
 238         if (p == NULL)
 239                 return;
 240
 241         p += offset;
 242         header = (struct th_header *)p;
 243
 244         ctcm_pr_debug("dump:\n");
 245         ctcm_pr_debug("skb len=%d \n", skb->len);
 246         if (skb->len > 2) {
 247                 switch (header->th_ch_flag) {
 248                 case TH_HAS_PDU:
 249                         break;
 250                 case 0x00:
 251                 case TH_IS_XID:
 252                         if ((header->th_blk_flag == TH_DATA_IS_XID) &&
 253                            (header->th_is_xid == 0x01))
 254                                 goto dumpth;
 255                 case TH_SWEEP_REQ:
 256                                 goto dumpth;
 257                 case TH_SWEEP_RESP:
 258                                 goto dumpth;
 259                 default:
 260                         break;
 261                 }
 262
 263                 pheader = (struct pdu *)p;
 264                 ctcm_pr_debug("pdu->offset: %d hex: %04x\n",
 265                                pheader->pdu_offset, pheader->pdu_offset);
 266                 ctcm_pr_debug("pdu->flag  : %02x\n", pheader->pdu_flag);
 267                 ctcm_pr_debug("pdu->proto : %02x\n", pheader->pdu_proto);
 268                 ctcm_pr_debug("pdu->seq   : %02x\n", pheader->pdu_seq);
 269                                         goto dumpdata;
 270
 271 dumpth:
 272                 ctcm_pr_debug("th->seg     : %02x\n", header->th_seg);
 273                 ctcm_pr_debug("th->ch      : %02x\n", header->th_ch_flag);
 274                 ctcm_pr_debug("th->blk_flag: %02x\n", header->th_blk_flag);
 275                 ctcm_pr_debug("th->type    : %s\n",
 276                                (header->th_is_xid) ? "DATA" : "XID");
 277                 ctcm_pr_debug("th->seqnum  : %04x\n", header->th_seq_num);
 278
 279         }
 280 dumpdata:
 281         if (bl > 32)
 282                 bl = 32;
 283         ctcm_pr_debug("data: ");
 284         for (i = 0; i < bl; i++)
 285                 ctcm_pr_debug("%02x%s", *p++, (i % 16) ? " " : "\n");
 286         ctcm_pr_debug("\n");
 287 }
 288 #endif
 289
 290 static struct net_device *ctcmpc_get_dev(int port_num)
 291 {
 292         char device[20];
 293         struct net_device *dev;
 294         struct ctcm_priv *priv;
 295
 296         scnprintf(device, sizeof(device), "%s%i", MPC_DEVICE_NAME, port_num);
 297
 298         dev = __dev_get_by_name(&init_net, device);
 299
 300         if (dev == NULL) {
 301                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 302                         "%s: Device not found by name: %s",
 303                                         CTCM_FUNTAIL, device);
 304                 return NULL;
 305         }
 306         priv = dev->ml_priv;
 307         if (priv == NULL) {
 308                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 309                         "%s(%s): dev->ml_priv is NULL",
 310                                         CTCM_FUNTAIL, device);
 311                 return NULL;
 312         }
 313         if (priv->mpcg == NULL) {
 314                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 315                         "%s(%s): priv->mpcg is NULL",
 316                                         CTCM_FUNTAIL, device);
 317                 return NULL;
 318         }
 319         return dev;
 320 }
 321
 322 /*
 323  * ctc_mpc_alloc_channel
 324  *      (exported interface)
 325  *
 326  * Device Initialization :
 327  *      ACTPATH  driven IO operations
 328  */
 329 int ctc_mpc_alloc_channel(int port_num, void (*callback)(int, int))
 330 {
 331         struct net_device *dev;
 332         struct mpc_group *grp;
 333         struct ctcm_priv *priv;
 334
 335         dev = ctcmpc_get_dev(port_num);
 336         if (dev == NULL)
 337                 return 1;
 338         priv = dev->ml_priv;
 339         grp = priv->mpcg;
 340
 341         grp->allochanfunc = callback;
 342         grp->port_num = port_num;
 343         grp->port_persist = 1;
 344
 345         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 346                         "%s(%s): state=%s",
 347                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 348
 349         switch (fsm_getstate(grp->fsm)) {
 350         case MPCG_STATE_INOP:
 351                 /* Group is in the process of terminating */
 352                 grp->alloc_called = 1;
 353                 break;
 354         case MPCG_STATE_RESET:
 355                 /* MPC Group will transition to state             */
 356                 /* MPCG_STATE_XID2INITW iff the minimum number    */
 357                 /* of 1 read and 1 write channel have successfully*/
 358                 /* activated                                      */
 359                 /*fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);*/
 360                 if (callback)
 361                         grp->send_qllc_disc = 1;
 362                 fallthrough;
 363         case MPCG_STATE_XID0IOWAIT:
 364                 fsm_deltimer(&grp->timer);
 365                 grp->outstanding_xid2 = 0;
 366                 grp->outstanding_xid7 = 0;
 367                 grp->outstanding_xid7_p2 = 0;
 368                 grp->saved_xid2 = NULL;
 369                 if (callback)
 370                         ctcm_open(dev);
 371                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 372                 break;
 373         case MPCG_STATE_READY:
 374                 /* XID exchanges completed after PORT was activated */
 375                 /* Link station already active                      */
 376                 /* Maybe timing issue...retry callback              */
 377                 grp->allocchan_callback_retries++;
 378                 if (grp->allocchan_callback_retries < 4) {
 379                         if (grp->allochanfunc)
 380                                 grp->allochanfunc(grp->port_num,
 381                                                   grp->group_max_buflen);
 382                 } else {
 383                         /* there are problems...bail out            */
 384                         /* there may be a state mismatch so restart */
 385                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 386                         grp->allocchan_callback_retries = 0;
 387                 }
 388                 break;
 389         }
 390
 391         return 0;
 392 }
 393 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 394
 395 /*
 396  * ctc_mpc_establish_connectivity
 397  *      (exported interface)
 398  */
 399 void ctc_mpc_establish_connectivity(int port_num,
 400                                 void (*callback)(int, int, int))
 401 {
 402         struct net_device *dev;
 403         struct mpc_group *grp;
 404         struct ctcm_priv *priv;
 405         struct channel *rch, *wch;
 406
 407         dev = ctcmpc_get_dev(port_num);
 408         if (dev == NULL)
 409                 return;
 410         priv = dev->ml_priv;
 411         grp = priv->mpcg;
 412         rch = priv->channel[CTCM_READ];
 413         wch = priv->channel[CTCM_WRITE];
 414
 415         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 416                         "%s(%s): state=%s",
 417                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 418
 419         grp->estconnfunc = callback;
 420         grp->port_num = port_num;
 421
 422         switch (fsm_getstate(grp->fsm)) {
 423         case MPCG_STATE_READY:
 424                 /* XID exchanges completed after PORT was activated */
 425                 /* Link station already active                      */
 426                 /* Maybe timing issue...retry callback              */
 427                 fsm_deltimer(&grp->timer);
 428                 grp->estconn_callback_retries++;
 429                 if (grp->estconn_callback_retries < 4) {
 430                         if (grp->estconnfunc) {
 431                                 grp->estconnfunc(grp->port_num, 0,
 432                                                 grp->group_max_buflen);
 433                                 grp->estconnfunc = NULL;
 434                         }
 435                 } else {
 436                         /* there are problems...bail out         */
 437                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 438                         grp->estconn_callback_retries = 0;
 439                 }
 440                 break;
 441         case MPCG_STATE_INOP:
 442         case MPCG_STATE_RESET:
 443                 /* MPC Group is not ready to start XID - min num of */
 444                 /* 1 read and 1 write channel have not been acquired*/
 445
 446                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 447                         "%s(%s): REJECTED - inactive channels",
 448                                         CTCM_FUNTAIL, dev->name);
 449                 if (grp->estconnfunc) {
 450                         grp->estconnfunc(grp->port_num, -1, 0);
 451                         grp->estconnfunc = NULL;
 452                 }
 453                 break;
 454         case MPCG_STATE_XID2INITW:
 455                 /* alloc channel was called but no XID exchange    */
 456                 /* has occurred. initiate xside XID exchange       */
 457                 /* make sure yside XID0 processing has not started */
 458
 459                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 460                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 461                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 462                                 "%s(%s): ABORT - PASSIVE XID",
 463                                         CTCM_FUNTAIL, dev->name);
 464                         break;
 465                 }
 466                 grp->send_qllc_disc = 1;
 467                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 468                 fsm_deltimer(&grp->timer);
 469                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 470                                                 MPCG_EVENT_TIMER, dev);
 471                 grp->outstanding_xid7 = 0;
 472                 grp->outstanding_xid7_p2 = 0;
 473                 grp->saved_xid2 = NULL;
 474                 if ((rch->in_mpcgroup) &&
 475                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 476                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 477                 else {
 478                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 479                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 480                                         CTCM_FUNTAIL, dev->name, rch->id);
 481                         if (grp->estconnfunc) {
 482                                 grp->estconnfunc(grp->port_num, -1, 0);
 483                                 grp->estconnfunc = NULL;
 484                         }
 485                         fsm_deltimer(&grp->timer);
 486                         goto done;
 487                 }
 488                 if ((wch->in_mpcgroup) &&
 489                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 490                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 491                 else {
 492                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 493                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 494                                         CTCM_FUNTAIL, dev->name, wch->id);
 495                         if (grp->estconnfunc) {
 496                                 grp->estconnfunc(grp->port_num, -1, 0);
 497                                 grp->estconnfunc = NULL;
 498                         }
 499                         fsm_deltimer(&grp->timer);
 500                         goto done;
 501                         }
 502                 break;
 503         case MPCG_STATE_XID0IOWAIT:
 504                 /* already in active XID negotiations */
 505         default:
 506                 break;
 507         }
 508
 509 done:
 510         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 511         return;
 512 }
 513 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 514
 515 /*
 516  * ctc_mpc_dealloc_ch
 517  *      (exported interface)
 518  */
 519 void ctc_mpc_dealloc_ch(int port_num)
 520 {
 521         struct net_device *dev;
 522         struct ctcm_priv *priv;
 523         struct mpc_group *grp;
 524
 525         dev = ctcmpc_get_dev(port_num);
 526         if (dev == NULL)
 527                 return;
 528         priv = dev->ml_priv;
 529         grp = priv->mpcg;
 530
 531         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 532                         "%s: %s: refcount = %d\n",
 533                         CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
 534
 535         fsm_deltimer(&priv->restart_timer);
 536         grp->channels_terminating = 0;
 537         fsm_deltimer(&grp->timer);
 538         grp->allochanfunc = NULL;
 539         grp->estconnfunc = NULL;
 540         grp->port_persist = 0;
 541         grp->send_qllc_disc = 0;
 542         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 543
 544         ctcm_close(dev);
 545         return;
 546 }
 547 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 548
 549 /*
 550  * ctc_mpc_flow_control
 551  *      (exported interface)
 552  */
 553 void ctc_mpc_flow_control(int port_num, int flowc)
 554 {
 555         struct ctcm_priv *priv;
 556         struct mpc_group *grp;
 557         struct net_device *dev;
 558         struct channel *rch;
 559         int mpcg_state;
 560
 561         dev = ctcmpc_get_dev(port_num);
 562         if (dev == NULL)
 563                 return;
 564         priv = dev->ml_priv;
 565         grp = priv->mpcg;
 566
 567         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 568                         "%s: %s: flowc = %d",
 569                                 CTCM_FUNTAIL, dev->name, flowc);
 570
 571         rch = priv->channel[CTCM_READ];
 572
 573         mpcg_state = fsm_getstate(grp->fsm);
 574         switch (flowc) {
 575         case 1:
 576                 if (mpcg_state == MPCG_STATE_FLOWC)
 577                         break;
 578                 if (mpcg_state == MPCG_STATE_READY) {
 579                         if (grp->flow_off_called == 1)
 580                                 grp->flow_off_called = 0;
 581                         else
 582                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 583                         break;
 584                 }
 585                 break;
 586         case 0:
 587                 if (mpcg_state == MPCG_STATE_FLOWC) {
 588                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 589                         /* ensure any data that has accumulated */
 590                         /* on the io_queue will now be sen t    */
 591                         tasklet_schedule(&rch->ch_tasklet);
 592                 }
 593                 /* possible race condition                      */
 594                 if (mpcg_state == MPCG_STATE_READY) {
 595                         grp->flow_off_called = 1;
 596                         break;
 597                 }
 598                 break;
 599         }
 600
 601 }
 602 EXPORT_SYMBOL(ctc_mpc_flow_control);
 603
 604 static int mpc_send_qllc_discontact(struct net_device *);
 605
 606 /*
 607  * helper function of ctcmpc_unpack_skb
 608 */
 609 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 610 {
 611         struct channel    *rch = mpcginfo->ch;
 612         struct net_device *dev = rch->netdev;
 613         struct ctcm_priv   *priv = dev->ml_priv;
 614         struct mpc_group  *grp = priv->mpcg;
 615         struct channel    *ch = priv->channel[CTCM_WRITE];
 616
 617         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 618         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 619
 620         grp->sweep_rsp_pend_num--;
 621
 622         if ((grp->sweep_req_pend_num == 0) &&
 623                         (grp->sweep_rsp_pend_num == 0)) {
 624                 fsm_deltimer(&ch->sweep_timer);
 625                 grp->in_sweep = 0;
 626                 rch->th_seq_num = 0x00;
 627                 ch->th_seq_num = 0x00;
 628                 ctcm_clear_busy_do(dev);
 629         }
 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
 905         grp->send_qllc_disc = 1;
 906         grp->changed_side = 0;
 907
 908         return;
 909
 910 }
 911
 912 /*
 913  * Increment the MPC Group Active Channel Counts
 914  * helper of dev_action (called from channel fsm)
 915  */
 916 void mpc_channel_action(struct channel *ch, int direction, int action)
 917 {
 918         struct net_device  *dev  = ch->netdev;
 919         struct ctcm_priv   *priv = dev->ml_priv;
 920         struct mpc_group   *grp  = priv->mpcg;
 921
 922         if (grp == NULL) {
 923                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 924                         "%s(%s): No MPC group",
 925                                 CTCM_FUNTAIL, dev->name);
 926                 return;
 927         }
 928
 929         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 930
 931         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 932                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 933                 "read=%i, write=%i\n", __func__, action,
 934                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 935                 grp->active_channels[CTCM_READ],
 936                 grp->active_channels[CTCM_WRITE]);
 937
 938         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 939                 grp->num_channel_paths++;
 940                 grp->active_channels[direction]++;
 941                 grp->outstanding_xid2++;
 942                 ch->in_mpcgroup = 1;
 943
 944                 if (ch->xid_skb != NULL)
 945                         dev_kfree_skb_any(ch->xid_skb);
 946
 947                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 948                                         GFP_ATOMIC | GFP_DMA);
 949                 if (ch->xid_skb == NULL) {
 950                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 951                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 952                                 CTCM_FUNTAIL, dev->name);
 953                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 954                         return;
 955                 }
 956                 ch->xid_skb_data = ch->xid_skb->data;
 957                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 958                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 959                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 960                 skb_put(ch->xid_skb, XID2_LENGTH);
 961                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 962                 ch->xid_skb->data = ch->xid_skb_data;
 963                 skb_reset_tail_pointer(ch->xid_skb);
 964                 ch->xid_skb->len = 0;
 965
 966                 skb_put_data(ch->xid_skb, grp->xid_skb->data,
 967                              grp->xid_skb->len);
 968
 969                 ch->xid->xid2_dlc_type =
 970                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 971                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 972
 973                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 974                         ch->xid->xid2_buf_len = 0x00;
 975
 976                 ch->xid_skb->data = ch->xid_skb_data;
 977                 skb_reset_tail_pointer(ch->xid_skb);
 978                 ch->xid_skb->len = 0;
 979
 980                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 981
 982                 if ((grp->active_channels[CTCM_READ] > 0) &&
 983                     (grp->active_channels[CTCM_WRITE] > 0) &&
 984                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 985                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 986                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 987                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
 988                                                 __func__, dev->name);
 989                 }
 990         } else if ((action == MPC_CHANNEL_REMOVE) &&
 991                         (ch->in_mpcgroup == 1)) {
 992                 ch->in_mpcgroup = 0;
 993                 grp->num_channel_paths--;
 994                 grp->active_channels[direction]--;
 995
 996                 if (ch->xid_skb != NULL)
 997                         dev_kfree_skb_any(ch->xid_skb);
 998                 ch->xid_skb = NULL;
 999
1000                 if (grp->channels_terminating)
1001                                         goto done;
1002
1003                 if (((grp->active_channels[CTCM_READ] == 0) &&
1004                                         (grp->active_channels[CTCM_WRITE] > 0))
1005                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1006                                         (grp->active_channels[CTCM_READ] > 0)))
1007                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008         }
1009 done:
1010         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1011                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1012                 "read=%i, write=%i\n", __func__, action,
1013                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1014                 grp->active_channels[CTCM_READ],
1015                 grp->active_channels[CTCM_WRITE]);
1016
1017         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1018 }
1019
1020 /*
1021  * Unpack a just received skb and hand it over to
1022  * upper layers.
1023  * special MPC version of unpack_skb.
1024  *
1025  * ch           The channel where this skb has been received.
1026  * pskb         The received skb.
1027  */
1028 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1029 {
1030         struct net_device *dev  = ch->netdev;
1031         struct ctcm_priv *priv = dev->ml_priv;
1032         struct mpc_group *grp = priv->mpcg;
1033         struct pdu *curr_pdu;
1034         struct mpcg_info *mpcginfo;
1035         struct th_header *header = NULL;
1036         struct th_sweep *sweep = NULL;
1037         int pdu_last_seen = 0;
1038         __u32 new_len;
1039         struct sk_buff *skb;
1040         int skblen;
1041         int sendrc = 0;
1042
1043         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1044                         __func__, dev->name, smp_processor_id(), ch->id);
1045
1046         header = (struct th_header *)pskb->data;
1047         if ((header->th_seg == 0) &&
1048                 (header->th_ch_flag == 0) &&
1049                 (header->th_blk_flag == 0) &&
1050                 (header->th_seq_num == 0))
1051                 /* nothing for us */    goto done;
1052
1053         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1054         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1055         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1056
1057         pskb->dev = dev;
1058         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1059         skb_pull(pskb, TH_HEADER_LENGTH);
1060
1061         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1062                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1063                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1064                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1065                     (header->th_seq_num != ch->th_seq_num + 1) &&
1066                     (ch->th_seq_num != 0))) {
1067                         /* This is NOT the next segment         *
1068                          * we are not the correct race winner   *
1069                          * go away and let someone else win     *
1070                          * BUT..this only applies if xid negot  *
1071                          * is done                              *
1072                         */
1073                         grp->out_of_sequence += 1;
1074                         __skb_push(pskb, TH_HEADER_LENGTH);
1075                         skb_queue_tail(&ch->io_queue, pskb);
1076                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1077                                         "got:%08x\n", __func__,
1078                                 ch->th_seq_num + 1, header->th_seq_num);
1079
1080                         return;
1081                 }
1082                 grp->out_of_sequence = 0;
1083                 ch->th_seq_num = header->th_seq_num;
1084
1085                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1086                                         __func__, ch->th_seq_num);
1087
1088                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1089                                         goto done;
1090                 while ((pskb->len > 0) && !pdu_last_seen) {
1091                         curr_pdu = (struct pdu *)pskb->data;
1092
1093                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1094                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1095                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1096                                                 __func__, pskb->len);
1097
1098                         skb_pull(pskb, PDU_HEADER_LENGTH);
1099
1100                         if (curr_pdu->pdu_flag & PDU_LAST)
1101                                 pdu_last_seen = 1;
1102                         if (curr_pdu->pdu_flag & PDU_CNTL)
1103                                 pskb->protocol = htons(ETH_P_SNAP);
1104                         else
1105                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1106
1107                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1108                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1109                                         "%s(%s): Dropping packet with "
1110                                         "illegal siize %d",
1111                                         CTCM_FUNTAIL, dev->name, pskb->len);
1112
1113                                 priv->stats.rx_dropped++;
1114                                 priv->stats.rx_length_errors++;
1115                                 goto done;
1116                         }
1117                         skb_reset_mac_header(pskb);
1118                         new_len = curr_pdu->pdu_offset;
1119                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1120                                                 __func__, new_len);
1121                         if ((new_len == 0) || (new_len > pskb->len)) {
1122                                 /* should never happen              */
1123                                 /* pskb len must be hosed...bail out */
1124                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1125                                         "%s(%s): non valid pdu_offset: %04x",
1126                                         /* "data may be lost", */
1127                                         CTCM_FUNTAIL, dev->name, new_len);
1128                                 goto done;
1129                         }
1130                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1131
1132                         if (!skb) {
1133                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1134                                         "%s(%s): MEMORY allocation error",
1135                                                 CTCM_FUNTAIL, dev->name);
1136                                 priv->stats.rx_dropped++;
1137                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1138                                 goto done;
1139                         }
1140                         skb_put_data(skb, pskb->data, new_len);
1141
1142                         skb_reset_mac_header(skb);
1143                         skb->dev = pskb->dev;
1144                         skb->protocol = pskb->protocol;
1145                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1146                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1147                         ch->pdu_seq++;
1148
1149                         if (do_debug_data) {
1150                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1151                                                 __func__, ch->pdu_seq);
1152                                 ctcm_pr_debug("%s: skb:%0lx "
1153                                         "skb len: %d \n", __func__,
1154                                         (unsigned long)skb, skb->len);
1155                                 ctcm_pr_debug("%s: up to 32 bytes "
1156                                         "of pdu_data sent\n", __func__);
1157                                 ctcmpc_dump32((char *)skb->data, skb->len);
1158                         }
1159
1160                         skblen = skb->len;
1161                         sendrc = netif_rx(skb);
1162                         priv->stats.rx_packets++;
1163                         priv->stats.rx_bytes += skblen;
1164                         skb_pull(pskb, new_len); /* point to next PDU */
1165                 }
1166         } else {
1167                 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1168                 if (mpcginfo == NULL)
1169                                         goto done;
1170
1171                 mpcginfo->ch = ch;
1172                 mpcginfo->th = header;
1173                 mpcginfo->skb = pskb;
1174                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1175                                         __func__);
1176                 /*  it's a sweep?   */
1177                 sweep = (struct th_sweep *)pskb->data;
1178                 mpcginfo->sweep = sweep;
1179                 if (header->th_ch_flag == TH_SWEEP_REQ)
1180                         mpc_rcvd_sweep_req(mpcginfo);
1181                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1182                         mpc_rcvd_sweep_resp(mpcginfo);
1183                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1184                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1185                         skb_pull(pskb, XID2_LENGTH);
1186                         mpcginfo->xid = thisxid;
1187                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1188                 } else if (header->th_blk_flag == TH_DISCONTACT)
1189                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1190                 else if (header->th_seq_num != 0) {
1191                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1192                                 "%s(%s): control pkt expected\n",
1193                                                 CTCM_FUNTAIL, dev->name);
1194                         priv->stats.rx_dropped++;
1195                         /* mpcginfo only used for non-data transfers */
1196                         if (do_debug_data)
1197                                 ctcmpc_dump_skb(pskb, -8);
1198                 }
1199                 kfree(mpcginfo);
1200         }
1201 done:
1202
1203         dev_kfree_skb_any(pskb);
1204         if (sendrc == NET_RX_DROP) {
1205                 dev_warn(&dev->dev,
1206                         "The network backlog for %s is exceeded, "
1207                         "package dropped\n", __func__);
1208                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1209         }
1210
1211         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1212                         __func__, dev->name, ch, ch->id);
1213 }
1214
1215 /*
1216  * tasklet helper for mpc's skb unpacking.
1217  *
1218  * ch           The channel to work on.
1219  * Allow flow control back pressure to occur here.
1220  * Throttling back channel can result in excessive
1221  * channel inactivity and system deact of channel
1222  */
1223 void ctcmpc_bh(unsigned long thischan)
1224 {
1225         struct channel    *ch   = (struct channel *)thischan;
1226         struct sk_buff    *skb;
1227         struct net_device *dev  = ch->netdev;
1228         struct ctcm_priv  *priv = dev->ml_priv;
1229         struct mpc_group  *grp  = priv->mpcg;
1230
1231         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1232                dev->name, smp_processor_id(), __func__, ch->id);
1233         /* caller has requested driver to throttle back */
1234         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1235                         (skb = skb_dequeue(&ch->io_queue))) {
1236                 ctcmpc_unpack_skb(ch, skb);
1237                 if (grp->out_of_sequence > 20) {
1238                         /* assume data loss has occurred if */
1239                         /* missing seq_num for extended     */
1240                         /* period of time                   */
1241                         grp->out_of_sequence = 0;
1242                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1243                         break;
1244                 }
1245                 if (skb == skb_peek(&ch->io_queue))
1246                         break;
1247         }
1248         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1249                         __func__, dev->name, ch, ch->id);
1250         return;
1251 }
1252
1253 /*
1254  *  MPC Group Initializations
1255  */
1256 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1257 {
1258         struct mpc_group *grp;
1259
1260         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1261                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1262
1263         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1264         if (grp == NULL)
1265                 return NULL;
1266
1267         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1268                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1269                         mpcg_fsm_len, GFP_KERNEL);
1270         if (grp->fsm == NULL) {
1271                 kfree(grp);
1272                 return NULL;
1273         }
1274
1275         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1276         fsm_settimer(grp->fsm, &grp->timer);
1277
1278         grp->xid_skb =
1279                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1280         if (grp->xid_skb == NULL) {
1281                 kfree_fsm(grp->fsm);
1282                 kfree(grp);
1283                 return NULL;
1284         }
1285         /*  base xid for all channels in group  */
1286         grp->xid_skb_data = grp->xid_skb->data;
1287         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1288         skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1289
1290         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1291         skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1292         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1293         grp->xid->xid2_sender_id = jiffies;
1294
1295         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1296         skb_put_data(grp->xid_skb, "VTAM", 4);
1297
1298         grp->rcvd_xid_skb =
1299                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1300         if (grp->rcvd_xid_skb == NULL) {
1301                 kfree_fsm(grp->fsm);
1302                 dev_kfree_skb(grp->xid_skb);
1303                 kfree(grp);
1304                 return NULL;
1305         }
1306         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1307         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1308         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1309         grp->saved_xid2 = NULL;
1310         priv->xid = grp->xid;
1311         priv->mpcg = grp;
1312         return grp;
1313 }
1314
1315 /*
1316  * The MPC Group Station FSM
1317  */
1318
1319 /*
1320  * MPC Group Station FSM actions
1321  * CTCM_PROTO_MPC only
1322  */
1323
1324 /*
1325  * NOP action for statemachines
1326  */
1327 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1328 {
1329 }
1330
1331 /*
1332  * invoked when the device transitions to dev_stopped
1333  * MPC will stop each individual channel if a single XID failure
1334  * occurs, or will intitiate all channels be stopped if a GROUP
1335  * level failure occurs.
1336  */
1337 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1338 {
1339         struct net_device  *dev = arg;
1340         struct ctcm_priv    *priv;
1341         struct mpc_group *grp;
1342         struct channel *wch;
1343
1344         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1345
1346         priv  = dev->ml_priv;
1347         grp =  priv->mpcg;
1348         grp->flow_off_called = 0;
1349         fsm_deltimer(&grp->timer);
1350         if (grp->channels_terminating)
1351                         return;
1352
1353         grp->channels_terminating = 1;
1354         grp->saved_state = fsm_getstate(grp->fsm);
1355         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1356         if (grp->saved_state > MPCG_STATE_XID7INITF)
1357                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1358                         "%s(%s): MPC GROUP INOPERATIVE",
1359                                 CTCM_FUNTAIL, dev->name);
1360         if ((grp->saved_state != MPCG_STATE_RESET) ||
1361                 /* dealloc_channel has been called */
1362                 (grp->port_persist == 0))
1363                 fsm_deltimer(&priv->restart_timer);
1364
1365         wch = priv->channel[CTCM_WRITE];
1366
1367         switch (grp->saved_state) {
1368         case MPCG_STATE_RESET:
1369         case MPCG_STATE_INOP:
1370         case MPCG_STATE_XID2INITW:
1371         case MPCG_STATE_XID0IOWAIT:
1372         case MPCG_STATE_XID2INITX:
1373         case MPCG_STATE_XID7INITW:
1374         case MPCG_STATE_XID7INITX:
1375         case MPCG_STATE_XID0IOWAIX:
1376         case MPCG_STATE_XID7INITI:
1377         case MPCG_STATE_XID7INITZ:
1378         case MPCG_STATE_XID7INITF:
1379                 break;
1380         case MPCG_STATE_FLOWC:
1381         case MPCG_STATE_READY:
1382         default:
1383                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1384         }
1385
1386         grp->xid2_tgnum = 0;
1387         grp->group_max_buflen = 0;  /*min of all received */
1388         grp->outstanding_xid2 = 0;
1389         grp->outstanding_xid7 = 0;
1390         grp->outstanding_xid7_p2 = 0;
1391         grp->saved_xid2 = NULL;
1392         grp->xidnogood = 0;
1393         grp->changed_side = 0;
1394
1395         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1396         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1397         grp->rcvd_xid_skb->len = 0;
1398         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1399         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1400
1401         if (grp->send_qllc_disc == 1) {
1402                 grp->send_qllc_disc = 0;
1403                 mpc_send_qllc_discontact(dev);
1404         }
1405
1406         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1407         /* This can result in INOP of VTAM PU due to halting of  */
1408         /* outstanding IO which causes a sense to be returned    */
1409         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1410         /* become unreachable without manual intervention        */
1411         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1412                 grp->alloc_called = 0;
1413                 fsm_deltimer(&priv->restart_timer);
1414                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1415                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1416                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1417                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1418                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1419                                         CTCM_FUNTAIL, dev->name);
1420         } else {
1421                 fsm_deltimer(&priv->restart_timer);
1422                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1423                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1424                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1425                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1426                                                 CTCM_FUNTAIL, dev->name);
1427         }
1428 }
1429
1430 /*
1431  * Handle mpc group  action timeout.
1432  * MPC Group Station FSM action
1433  * CTCM_PROTO_MPC only
1434  *
1435  * fi           An instance of an mpc_group fsm.
1436  * event        The event, just happened.
1437  * arg          Generic pointer, casted from net_device * upon call.
1438  */
1439 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1440 {
1441         struct net_device *dev = arg;
1442         struct ctcm_priv *priv;
1443         struct mpc_group *grp;
1444         struct channel *wch;
1445         struct channel *rch;
1446
1447         priv = dev->ml_priv;
1448         grp = priv->mpcg;
1449         wch = priv->channel[CTCM_WRITE];
1450         rch = priv->channel[CTCM_READ];
1451
1452         switch (fsm_getstate(grp->fsm)) {
1453         case MPCG_STATE_XID2INITW:
1454                 /* Unless there is outstanding IO on the  */
1455                 /* channel just return and wait for ATTN  */
1456                 /* interrupt to begin XID negotiations    */
1457                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1458                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1459                         break;
1460                 fallthrough;
1461         default:
1462                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1463         }
1464
1465         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1466                         "%s: dev=%s exit",
1467                         CTCM_FUNTAIL, dev->name);
1468         return;
1469 }
1470
1471 /*
1472  * MPC Group Station FSM action
1473  * CTCM_PROTO_MPC only
1474  */
1475 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1476 {
1477         struct mpcg_info   *mpcginfo   = arg;
1478         struct channel     *ch         = mpcginfo->ch;
1479         struct net_device  *dev;
1480         struct ctcm_priv   *priv;
1481         struct mpc_group   *grp;
1482
1483         if (ch) {
1484                 dev = ch->netdev;
1485                 if (dev) {
1486                         priv = dev->ml_priv;
1487                         if (priv) {
1488                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1489                                         "%s: %s: %s\n",
1490                                         CTCM_FUNTAIL, dev->name, ch->id);
1491                                 grp = priv->mpcg;
1492                                 grp->send_qllc_disc = 1;
1493                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1494                         }
1495                 }
1496         }
1497
1498         return;
1499 }
1500
1501 /*
1502  * MPC Group Station - not part of FSM
1503  * CTCM_PROTO_MPC only
1504  * called from add_channel in ctcm_main.c
1505  */
1506 void mpc_action_send_discontact(unsigned long thischan)
1507 {
1508         int rc;
1509         struct channel  *ch = (struct channel *)thischan;
1510         unsigned long   saveflags = 0;
1511
1512         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1513         rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1514         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1515
1516         if (rc != 0) {
1517                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1518         }
1519
1520         return;
1521 }
1522
1523
1524 /*
1525  * helper function of mpc FSM
1526  * CTCM_PROTO_MPC only
1527  * mpc_action_rcvd_xid7
1528 */
1529 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1530 {
1531         struct channel     *ch   = mpcginfo->ch;
1532         struct net_device  *dev  = ch->netdev;
1533         struct ctcm_priv   *priv = dev->ml_priv;
1534         struct mpc_group   *grp  = priv->mpcg;
1535         struct xid2        *xid  = mpcginfo->xid;
1536         int     rc       = 0;
1537         __u64   our_id   = 0;
1538         __u64   their_id = 0;
1539         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1540
1541         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1542
1543         if (xid == NULL) {
1544                 rc = 1;
1545                 /* XID REJECTED: xid == NULL */
1546                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1547                         "%s(%s): xid = NULL",
1548                                 CTCM_FUNTAIL, ch->id);
1549                 goto done;
1550         }
1551
1552         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1553
1554         /*the received direction should be the opposite of ours  */
1555         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1556                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1557                 rc = 2;
1558                 /* XID REJECTED: r/w channel pairing mismatch */
1559                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1560                         "%s(%s): r/w channel pairing mismatch",
1561                                 CTCM_FUNTAIL, ch->id);
1562                 goto done;
1563         }
1564
1565         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1566                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1567                                 grp->group_max_buflen, xid->xid2_buf_len);
1568
1569                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1570                                                 xid->xid2_buf_len - len)
1571                         grp->group_max_buflen = xid->xid2_buf_len - len;
1572         }
1573
1574         if (grp->saved_xid2 == NULL) {
1575                 grp->saved_xid2 =
1576                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1577
1578                 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1579                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1580
1581                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1582                 grp->rcvd_xid_skb->len = 0;
1583
1584                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1585                 our_id = (__u64)priv->xid->xid2_adj_id;
1586                 our_id = our_id << 32;
1587                 our_id = our_id + priv->xid->xid2_sender_id;
1588                 their_id = (__u64)xid->xid2_adj_id;
1589                 their_id = their_id << 32;
1590                 their_id = their_id + xid->xid2_sender_id;
1591                 /* lower id assume the xside role */
1592                 if (our_id < their_id) {
1593                         grp->roll = XSIDE;
1594                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1595                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1596                                         CTCM_FUNTAIL, ch->id);
1597                 } else {
1598                         grp->roll = YSIDE;
1599                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1600                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1601                                         CTCM_FUNTAIL, ch->id);
1602                 }
1603
1604         } else {
1605                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1606                         rc = 3;
1607                         /* XID REJECTED: xid flag byte4 mismatch */
1608                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1609                                 "%s(%s): xid flag byte4 mismatch",
1610                                         CTCM_FUNTAIL, ch->id);
1611                 }
1612                 if (xid->xid2_flag2 == 0x40) {
1613                         rc = 4;
1614                         /* XID REJECTED - xid NOGOOD */
1615                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1616                                 "%s(%s): xid NOGOOD",
1617                                         CTCM_FUNTAIL, ch->id);
1618                 }
1619                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1620                         rc = 5;
1621                         /* XID REJECTED - Adjacent Station ID Mismatch */
1622                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1623                                 "%s(%s): Adjacent Station ID Mismatch",
1624                                         CTCM_FUNTAIL, ch->id);
1625                 }
1626                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1627                         rc = 6;
1628                         /* XID REJECTED - Sender Address Mismatch */
1629                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1630                                 "%s(%s): Sender Address Mismatch",
1631                                         CTCM_FUNTAIL, ch->id);
1632                 }
1633         }
1634 done:
1635         if (rc) {
1636                 dev_warn(&dev->dev,
1637                         "The XID used in the MPC protocol is not valid, "
1638                         "rc = %d\n", rc);
1639                 priv->xid->xid2_flag2 = 0x40;
1640                 grp->saved_xid2->xid2_flag2 = 0x40;
1641         }
1642
1643         return rc;
1644 }
1645
1646 /*
1647  * MPC Group Station FSM action
1648  * CTCM_PROTO_MPC only
1649  */
1650 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1651 {
1652         struct channel *ch = arg;
1653         int rc = 0;
1654         int gotlock = 0;
1655         unsigned long saveflags = 0;    /* avoids compiler warning with
1656                                            spin_unlock_irqrestore */
1657
1658         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1659                         __func__, smp_processor_id(), ch, ch->id);
1660
1661         if (ctcm_checkalloc_buffer(ch))
1662                                         goto done;
1663
1664         /*
1665          * skb data-buffer referencing:
1666          */
1667         ch->trans_skb->data = ch->trans_skb_data;
1668         skb_reset_tail_pointer(ch->trans_skb);
1669         ch->trans_skb->len = 0;
1670         /* result of the previous 3 statements is NOT always
1671          * already set after ctcm_checkalloc_buffer
1672          * because of possible reuse of the trans_skb
1673          */
1674         memset(ch->trans_skb->data, 0, 16);
1675         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1676         /* check is main purpose here: */
1677         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1678         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1679         /* check is main purpose here: */
1680         skb_put(ch->trans_skb, XID2_LENGTH);
1681         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1682         /* cleanup back to startpoint */
1683         ch->trans_skb->data = ch->trans_skb_data;
1684         skb_reset_tail_pointer(ch->trans_skb);
1685         ch->trans_skb->len = 0;
1686
1687         /* non-checking rewrite of above skb data-buffer referencing: */
1688         /*
1689         memset(ch->trans_skb->data, 0, 16);
1690         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1691         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1692         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1693          */
1694
1695         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1696         ch->ccw[8].count        = 0;
1697         ch->ccw[8].cda          = 0x00;
1698
1699         if (!(ch->xid_th && ch->xid && ch->xid_id))
1700                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1701                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1702                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1703
1704         if (side == XSIDE) {
1705                 /* mpc_action_xside_xid */
1706                 if (ch->xid_th == NULL)
1707                                 goto done;
1708                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1709                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1710                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1711                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1712
1713                 if (ch->xid == NULL)
1714                                 goto done;
1715                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1716                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1717                 ch->ccw[10].count       = XID2_LENGTH;
1718                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1719
1720                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1721                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1722                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1723                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1724
1725                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1726                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1727                 ch->ccw[12].count       = XID2_LENGTH;
1728                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1729
1730                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1731                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1732
1733         } else { /* side == YSIDE : mpc_action_yside_xid */
1734                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1735                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1736                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1737                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1738
1739                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1740                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1741                 ch->ccw[10].count       = XID2_LENGTH;
1742                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1743
1744                 if (ch->xid_th == NULL)
1745                                 goto done;
1746                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1747                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1748                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1749                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1750
1751                 if (ch->xid == NULL)
1752                                 goto done;
1753                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1754                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1755                 ch->ccw[12].count       = XID2_LENGTH;
1756                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1757
1758                 if (ch->xid_id == NULL)
1759                                 goto done;
1760                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1761                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1762
1763         }
1764         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1765         ch->ccw[13].count       = 4;
1766
1767         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1768         ch->ccw[14].flags       = CCW_FLAG_SLI;
1769         ch->ccw[14].count       = 0;
1770         ch->ccw[14].cda         = 0;
1771
1772         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1773         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1774         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1775         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1776
1777         if (!in_hardirq()) {
1778                          /* Such conditional locking is a known problem for
1779                           * sparse because its static undeterministic.
1780                           * Warnings should be ignored here. */
1781                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1782                 gotlock = 1;
1783         }
1784
1785         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1786         rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1787
1788         if (gotlock)    /* see remark above about conditional locking */
1789                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1790
1791         if (rc != 0) {
1792                 ctcm_ccw_check_rc(ch, rc,
1793                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1794         }
1795
1796 done:
1797         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1798                                 __func__, ch, ch->id);
1799         return;
1800
1801 }
1802
1803 /*
1804  * MPC Group Station FSM action
1805  * CTCM_PROTO_MPC only
1806  */
1807 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1808 {
1809         mpc_action_side_xid(fsm, arg, XSIDE);
1810 }
1811
1812 /*
1813  * MPC Group Station FSM action
1814  * CTCM_PROTO_MPC only
1815  */
1816 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1817 {
1818         mpc_action_side_xid(fsm, arg, YSIDE);
1819 }
1820
1821 /*
1822  * MPC Group Station FSM action
1823  * CTCM_PROTO_MPC only
1824  */
1825 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1826 {
1827         struct channel     *ch   = arg;
1828         struct net_device  *dev  = ch->netdev;
1829         struct ctcm_priv   *priv = dev->ml_priv;
1830         struct mpc_group   *grp  = priv->mpcg;
1831
1832         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1833                         __func__, smp_processor_id(), ch, ch->id);
1834
1835         if (ch->xid == NULL) {
1836                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1837                         "%s(%s): ch->xid == NULL",
1838                                 CTCM_FUNTAIL, dev->name);
1839                 return;
1840         }
1841
1842         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1843
1844         ch->xid->xid2_option =  XID2_0;
1845
1846         switch (fsm_getstate(grp->fsm)) {
1847         case MPCG_STATE_XID2INITW:
1848         case MPCG_STATE_XID2INITX:
1849                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1850                 break;
1851         case MPCG_STATE_XID0IOWAIT:
1852         case MPCG_STATE_XID0IOWAIX:
1853                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1854                 break;
1855         }
1856
1857         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1858
1859         return;
1860 }
1861
1862 /*
1863  * MPC Group Station FSM action
1864  * CTCM_PROTO_MPC only
1865 */
1866 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1867 {
1868         struct net_device *dev = arg;
1869         struct ctcm_priv  *priv = dev->ml_priv;
1870         struct mpc_group  *grp  = NULL;
1871         int direction;
1872         int send = 0;
1873
1874         if (priv)
1875                 grp = priv->mpcg;
1876         if (grp == NULL)
1877                 return;
1878
1879         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1880                 struct channel *ch = priv->channel[direction];
1881                 struct xid2 *thisxid = ch->xid;
1882                 ch->xid_skb->data = ch->xid_skb_data;
1883                 skb_reset_tail_pointer(ch->xid_skb);
1884                 ch->xid_skb->len = 0;
1885                 thisxid->xid2_option = XID2_7;
1886                 send = 0;
1887
1888                 /* xid7 phase 1 */
1889                 if (grp->outstanding_xid7_p2 > 0) {
1890                         if (grp->roll == YSIDE) {
1891                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1892                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1893                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1894                                         skb_put_data(ch->xid_skb, &thdummy,
1895                                                      TH_HEADER_LENGTH);
1896                                         send = 1;
1897                                 }
1898                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1899                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1900                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1901                                         skb_put_data(ch->xid_skb, &thnorm,
1902                                                      TH_HEADER_LENGTH);
1903                                         send = 1;
1904                         }
1905                 } else {
1906                         /* xid7 phase 2 */
1907                         if (grp->roll == YSIDE) {
1908                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1909                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1910                                         skb_put_data(ch->xid_skb, &thnorm,
1911                                                      TH_HEADER_LENGTH);
1912                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1913                                         send = 1;
1914                                 }
1915                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1916                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1917                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1918                                 skb_put_data(ch->xid_skb, &thdummy,
1919                                              TH_HEADER_LENGTH);
1920                                 send = 1;
1921                         }
1922                 }
1923
1924                 if (send)
1925                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1926         }
1927
1928         return;
1929 }
1930
1931 /*
1932  * MPC Group Station FSM action
1933  * CTCM_PROTO_MPC only
1934  */
1935 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1936 {
1937
1938         struct mpcg_info   *mpcginfo  = arg;
1939         struct channel     *ch   = mpcginfo->ch;
1940         struct net_device  *dev  = ch->netdev;
1941         struct ctcm_priv   *priv = dev->ml_priv;
1942         struct mpc_group   *grp  = priv->mpcg;
1943
1944         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1945                         __func__, ch->id, grp->outstanding_xid2,
1946                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1947
1948         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1949                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1950
1951         grp->outstanding_xid2--;
1952         grp->outstanding_xid7++;
1953         grp->outstanding_xid7_p2++;
1954
1955         /* must change state before validating xid to */
1956         /* properly handle interim interrupts received*/
1957         switch (fsm_getstate(grp->fsm)) {
1958         case MPCG_STATE_XID2INITW:
1959                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1960                 mpc_validate_xid(mpcginfo);
1961                 break;
1962         case MPCG_STATE_XID0IOWAIT:
1963                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1964                 mpc_validate_xid(mpcginfo);
1965                 break;
1966         case MPCG_STATE_XID2INITX:
1967                 if (grp->outstanding_xid2 == 0) {
1968                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1969                         mpc_validate_xid(mpcginfo);
1970                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1971                 }
1972                 break;
1973         case MPCG_STATE_XID0IOWAIX:
1974                 if (grp->outstanding_xid2 == 0) {
1975                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1976                         mpc_validate_xid(mpcginfo);
1977                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1978                 }
1979                 break;
1980         }
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         return;
2042 }
2043
2044 /*
2045  * mpc_action helper of an MPC Group Station FSM action
2046  * CTCM_PROTO_MPC only
2047  */
2048 static int mpc_send_qllc_discontact(struct net_device *dev)
2049 {
2050         struct sk_buff   *skb;
2051         struct qllc      *qllcptr;
2052         struct ctcm_priv *priv = dev->ml_priv;
2053         struct mpc_group *grp = priv->mpcg;
2054
2055         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2056                 __func__, mpcg_state_names[grp->saved_state]);
2057
2058         switch (grp->saved_state) {
2059         /*
2060          * establish conn callback function is
2061          * preferred method to report failure
2062          */
2063         case MPCG_STATE_XID0IOWAIT:
2064         case MPCG_STATE_XID0IOWAIX:
2065         case MPCG_STATE_XID7INITI:
2066         case MPCG_STATE_XID7INITZ:
2067         case MPCG_STATE_XID2INITW:
2068         case MPCG_STATE_XID2INITX:
2069         case MPCG_STATE_XID7INITW:
2070         case MPCG_STATE_XID7INITX:
2071                 if (grp->estconnfunc) {
2072                         grp->estconnfunc(grp->port_num, -1, 0);
2073                         grp->estconnfunc = NULL;
2074                         break;
2075                 }
2076                 fallthrough;
2077         case MPCG_STATE_FLOWC:
2078         case MPCG_STATE_READY:
2079                 grp->send_qllc_disc = 2;
2080
2081                 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2082                 if (skb == NULL) {
2083                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2084                                 "%s(%s): skb allocation error",
2085                                                 CTCM_FUNTAIL, dev->name);
2086                         priv->stats.rx_dropped++;
2087                         return -ENOMEM;
2088                 }
2089
2090                 qllcptr = skb_put(skb, sizeof(struct qllc));
2091                 qllcptr->qllc_address = 0xcc;
2092                 qllcptr->qllc_commands = 0x03;
2093
2094                 if (skb_headroom(skb) < 4) {
2095                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2096                                 "%s(%s): skb_headroom error",
2097                                                 CTCM_FUNTAIL, dev->name);
2098                         dev_kfree_skb_any(skb);
2099                         return -ENOMEM;
2100                 }
2101
2102                 *((__u32 *)skb_push(skb, 4)) =
2103                         priv->channel[CTCM_READ]->pdu_seq;
2104                 priv->channel[CTCM_READ]->pdu_seq++;
2105                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2106                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2107
2108                 /* receipt of CC03 resets anticipated sequence number on
2109                       receiving side */
2110                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2111                 skb_reset_mac_header(skb);
2112                 skb->dev = dev;
2113                 skb->protocol = htons(ETH_P_SNAP);
2114                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2115
2116                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2117
2118                 netif_rx(skb);
2119                 break;
2120         default:
2121                 break;
2122
2123         }
2124
2125         return 0;
2126 }
2127 /* --- This is the END my friend --- */
2128