drivers/s390/net/ctcm_mpc.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *      Copyright IBM Corp. 2004, 2007
   4  *      Authors:        Belinda Thompson ([email protected])
   5  *                      Andy Richter ([email protected])
   6  *                      Peter Tiedemann ([email protected])
   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         return;
 630
 631 }
 632
 633 /*
 634  * helper function of mpc_rcvd_sweep_req
 635  * which is a helper of ctcmpc_unpack_skb
 636  */
 637 static void ctcmpc_send_sweep_resp(struct channel *rch)
 638 {
 639         struct net_device *dev = rch->netdev;
 640         struct ctcm_priv *priv = dev->ml_priv;
 641         struct mpc_group *grp = priv->mpcg;
 642         struct th_sweep *header;
 643         struct sk_buff *sweep_skb;
 644         struct channel *ch  = priv->channel[CTCM_WRITE];
 645
 646         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 647
 648         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 649         if (sweep_skb == NULL) {
 650                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 651                         "%s(%s): sweep_skb allocation ERROR\n",
 652                         CTCM_FUNTAIL, rch->id);
 653                 goto done;
 654         }
 655
 656         header = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
 657         header->th.th_ch_flag   = TH_SWEEP_RESP;
 658         header->sw.th_last_seq  = ch->th_seq_num;
 659
 660         netif_trans_update(dev);
 661         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 662
 663         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 664
 665         return;
 666
 667 done:
 668         grp->in_sweep = 0;
 669         ctcm_clear_busy_do(dev);
 670         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 671
 672         return;
 673 }
 674
 675 /*
 676  * helper function of ctcmpc_unpack_skb
 677  */
 678 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 679 {
 680         struct channel    *rch     = mpcginfo->ch;
 681         struct net_device *dev     = rch->netdev;
 682         struct ctcm_priv  *priv = dev->ml_priv;
 683         struct mpc_group  *grp  = priv->mpcg;
 684         struct channel    *ch      = priv->channel[CTCM_WRITE];
 685
 686         if (do_debug)
 687                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 688                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 689
 690         if (grp->in_sweep == 0) {
 691                 grp->in_sweep = 1;
 692                 ctcm_test_and_set_busy(dev);
 693                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 694                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 695         }
 696
 697         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 698
 699         grp->sweep_req_pend_num--;
 700         ctcmpc_send_sweep_resp(ch);
 701         kfree(mpcginfo);
 702         return;
 703 }
 704
 705 /*
 706   * MPC Group Station FSM definitions
 707  */
 708 static const char *mpcg_event_names[] = {
 709         [MPCG_EVENT_INOP]       = "INOP Condition",
 710         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 711         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 712         [MPCG_EVENT_XID2]       = "XID2 Received",
 713         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 714         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 715         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 716         [MPCG_EVENT_DOIO]       = "XID DoIO",
 717 };
 718
 719 static const char *mpcg_state_names[] = {
 720         [MPCG_STATE_RESET]      = "Reset",
 721         [MPCG_STATE_INOP]       = "INOP",
 722         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 723         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 724         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 725         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 726         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 727         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 728         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 729         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 730         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 731         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 732         [MPCG_STATE_READY]      = "READY",
 733 };
 734
 735 /*
 736  * The MPC Group Station FSM
 737  *   22 events
 738  */
 739 static const fsm_node mpcg_fsm[] = {
 740         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 741         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 742         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 743
 744         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 745         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 746
 747         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 748         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 749         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 750         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 751         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 752
 753         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 754         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 755         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 756         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 757         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 758
 759         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 760         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 761         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 762         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 763         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 764         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 765         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 766
 767         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 768         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 769         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 770         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 771         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 772         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 773
 774         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 775         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 776         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 777         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 778         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 779         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 780
 781         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 782         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 783         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 784         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 785         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 786         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 787
 788         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 789         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 790         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 791         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 792         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 793         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 794         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 795
 796         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 797         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 798         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 799         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 800         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 801         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 802
 803         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 804         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 805 };
 806
 807 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 808
 809 /*
 810  * MPC Group Station FSM action
 811  * CTCM_PROTO_MPC only
 812  */
 813 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 814 {
 815         struct net_device *dev = arg;
 816         struct ctcm_priv *priv = dev->ml_priv;
 817         struct mpc_group *grp = priv->mpcg;
 818
 819         if (grp == NULL) {
 820                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 821                         "%s(%s): No MPC group",
 822                                 CTCM_FUNTAIL, dev->name);
 823                 return;
 824         }
 825
 826         fsm_deltimer(&grp->timer);
 827
 828         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 829                 priv->xid->xid2_flag2 = 0x00;
 830                 if (grp->estconnfunc) {
 831                         grp->estconnfunc(grp->port_num, 1,
 832                                         grp->group_max_buflen);
 833                         grp->estconnfunc = NULL;
 834                 } else if (grp->allochanfunc)
 835                         grp->send_qllc_disc = 1;
 836
 837                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 838                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 839                                 "%s(%s): fails",
 840                                         CTCM_FUNTAIL, dev->name);
 841                 return;
 842         }
 843
 844         grp->port_persist = 1;
 845         grp->out_of_sequence = 0;
 846         grp->estconn_called = 0;
 847
 848         tasklet_hi_schedule(&grp->mpc_tasklet2);
 849
 850         return;
 851 }
 852
 853 /*
 854  * helper of ctcm_init_netdevice
 855  * CTCM_PROTO_MPC only
 856  */
 857 void mpc_group_ready(unsigned long adev)
 858 {
 859         struct net_device *dev = (struct net_device *)adev;
 860         struct ctcm_priv *priv = dev->ml_priv;
 861         struct mpc_group *grp = priv->mpcg;
 862         struct channel *ch = NULL;
 863
 864         if (grp == NULL) {
 865                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 866                         "%s(%s): No MPC group",
 867                                 CTCM_FUNTAIL, dev->name);
 868                 return;
 869         }
 870
 871         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 872                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 873                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 874
 875         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 876
 877         /* Put up a read on the channel */
 878         ch = priv->channel[CTCM_READ];
 879         ch->pdu_seq = 0;
 880         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 881                         __func__, ch->pdu_seq);
 882
 883         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 884         /* Put the write channel in idle state */
 885         ch = priv->channel[CTCM_WRITE];
 886         if (ch->collect_len > 0) {
 887                 spin_lock(&ch->collect_lock);
 888                 ctcm_purge_skb_queue(&ch->collect_queue);
 889                 ch->collect_len = 0;
 890                 spin_unlock(&ch->collect_lock);
 891         }
 892         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 893         ctcm_clear_busy(dev);
 894
 895         if (grp->estconnfunc) {
 896                 grp->estconnfunc(grp->port_num, 0,
 897                                     grp->group_max_buflen);
 898                 grp->estconnfunc = NULL;
 899         } else  if (grp->allochanfunc)
 900                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 901
 902         grp->send_qllc_disc = 1;
 903         grp->changed_side = 0;
 904
 905         return;
 906
 907 }
 908
 909 /*
 910  * Increment the MPC Group Active Channel Counts
 911  * helper of dev_action (called from channel fsm)
 912  */
 913 void mpc_channel_action(struct channel *ch, int direction, int action)
 914 {
 915         struct net_device  *dev  = ch->netdev;
 916         struct ctcm_priv   *priv = dev->ml_priv;
 917         struct mpc_group   *grp  = priv->mpcg;
 918
 919         if (grp == NULL) {
 920                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 921                         "%s(%s): No MPC group",
 922                                 CTCM_FUNTAIL, dev->name);
 923                 return;
 924         }
 925
 926         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 927
 928         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 929                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 930                 "read=%i, write=%i\n", __func__, action,
 931                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 932                 grp->active_channels[CTCM_READ],
 933                 grp->active_channels[CTCM_WRITE]);
 934
 935         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 936                 grp->num_channel_paths++;
 937                 grp->active_channels[direction]++;
 938                 grp->outstanding_xid2++;
 939                 ch->in_mpcgroup = 1;
 940
 941                 if (ch->xid_skb != NULL)
 942                         dev_kfree_skb_any(ch->xid_skb);
 943
 944                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 945                                         GFP_ATOMIC | GFP_DMA);
 946                 if (ch->xid_skb == NULL) {
 947                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 948                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 949                                 CTCM_FUNTAIL, dev->name);
 950                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 951                         return;
 952                 }
 953                 ch->xid_skb_data = ch->xid_skb->data;
 954                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 955                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 956                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 957                 skb_put(ch->xid_skb, XID2_LENGTH);
 958                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 959                 ch->xid_skb->data = ch->xid_skb_data;
 960                 skb_reset_tail_pointer(ch->xid_skb);
 961                 ch->xid_skb->len = 0;
 962
 963                 skb_put_data(ch->xid_skb, grp->xid_skb->data,
 964                              grp->xid_skb->len);
 965
 966                 ch->xid->xid2_dlc_type =
 967                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 968                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 969
 970                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 971                         ch->xid->xid2_buf_len = 0x00;
 972
 973                 ch->xid_skb->data = ch->xid_skb_data;
 974                 skb_reset_tail_pointer(ch->xid_skb);
 975                 ch->xid_skb->len = 0;
 976
 977                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 978
 979                 if ((grp->active_channels[CTCM_READ] > 0) &&
 980                     (grp->active_channels[CTCM_WRITE] > 0) &&
 981                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 982                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 983                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 984                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
 985                                                 __func__, dev->name);
 986                 }
 987         } else if ((action == MPC_CHANNEL_REMOVE) &&
 988                         (ch->in_mpcgroup == 1)) {
 989                 ch->in_mpcgroup = 0;
 990                 grp->num_channel_paths--;
 991                 grp->active_channels[direction]--;
 992
 993                 if (ch->xid_skb != NULL)
 994                         dev_kfree_skb_any(ch->xid_skb);
 995                 ch->xid_skb = NULL;
 996
 997                 if (grp->channels_terminating)
 998                                         goto done;
 999
1000                 if (((grp->active_channels[CTCM_READ] == 0) &&
1001                                         (grp->active_channels[CTCM_WRITE] > 0))
1002                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1003                                         (grp->active_channels[CTCM_READ] > 0)))
1004                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1005         }
1006 done:
1007         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1008                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1009                 "read=%i, write=%i\n", __func__, action,
1010                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1011                 grp->active_channels[CTCM_READ],
1012                 grp->active_channels[CTCM_WRITE]);
1013
1014         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1015 }
1016
1017 /*
1018  * Unpack a just received skb and hand it over to
1019  * upper layers.
1020  * special MPC version of unpack_skb.
1021  *
1022  * ch           The channel where this skb has been received.
1023  * pskb         The received skb.
1024  */
1025 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1026 {
1027         struct net_device *dev  = ch->netdev;
1028         struct ctcm_priv *priv = dev->ml_priv;
1029         struct mpc_group *grp = priv->mpcg;
1030         struct pdu *curr_pdu;
1031         struct mpcg_info *mpcginfo;
1032         struct th_header *header = NULL;
1033         struct th_sweep *sweep = NULL;
1034         int pdu_last_seen = 0;
1035         __u32 new_len;
1036         struct sk_buff *skb;
1037         int skblen;
1038         int sendrc = 0;
1039
1040         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1041                         __func__, dev->name, smp_processor_id(), ch->id);
1042
1043         header = (struct th_header *)pskb->data;
1044         if ((header->th_seg == 0) &&
1045                 (header->th_ch_flag == 0) &&
1046                 (header->th_blk_flag == 0) &&
1047                 (header->th_seq_num == 0))
1048                 /* nothing for us */    goto done;
1049
1050         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1051         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1052         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1053
1054         pskb->dev = dev;
1055         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1056         skb_pull(pskb, TH_HEADER_LENGTH);
1057
1058         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1059                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1060                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1061                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1062                     (header->th_seq_num != ch->th_seq_num + 1) &&
1063                     (ch->th_seq_num != 0))) {
1064                         /* This is NOT the next segment         *
1065                          * we are not the correct race winner   *
1066                          * go away and let someone else win     *
1067                          * BUT..this only applies if xid negot  *
1068                          * is done                              *
1069                         */
1070                         grp->out_of_sequence += 1;
1071                         __skb_push(pskb, TH_HEADER_LENGTH);
1072                         skb_queue_tail(&ch->io_queue, pskb);
1073                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1074                                         "got:%08x\n", __func__,
1075                                 ch->th_seq_num + 1, header->th_seq_num);
1076
1077                         return;
1078                 }
1079                 grp->out_of_sequence = 0;
1080                 ch->th_seq_num = header->th_seq_num;
1081
1082                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1083                                         __func__, ch->th_seq_num);
1084
1085                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1086                                         goto done;
1087                 while ((pskb->len > 0) && !pdu_last_seen) {
1088                         curr_pdu = (struct pdu *)pskb->data;
1089
1090                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1091                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1092                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1093                                                 __func__, pskb->len);
1094
1095                         skb_pull(pskb, PDU_HEADER_LENGTH);
1096
1097                         if (curr_pdu->pdu_flag & PDU_LAST)
1098                                 pdu_last_seen = 1;
1099                         if (curr_pdu->pdu_flag & PDU_CNTL)
1100                                 pskb->protocol = htons(ETH_P_SNAP);
1101                         else
1102                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1103
1104                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1105                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1106                                         "%s(%s): Dropping packet with "
1107                                         "illegal siize %d",
1108                                         CTCM_FUNTAIL, dev->name, pskb->len);
1109
1110                                 priv->stats.rx_dropped++;
1111                                 priv->stats.rx_length_errors++;
1112                                         goto done;
1113                         }
1114                         skb_reset_mac_header(pskb);
1115                         new_len = curr_pdu->pdu_offset;
1116                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1117                                                 __func__, new_len);
1118                         if ((new_len == 0) || (new_len > pskb->len)) {
1119                                 /* should never happen              */
1120                                 /* pskb len must be hosed...bail out */
1121                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1122                                         "%s(%s): non valid pdu_offset: %04x",
1123                                         /* "data may be lost", */
1124                                         CTCM_FUNTAIL, dev->name, new_len);
1125                                 goto done;
1126                         }
1127                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1128
1129                         if (!skb) {
1130                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1131                                         "%s(%s): MEMORY allocation error",
1132                                                 CTCM_FUNTAIL, dev->name);
1133                                 priv->stats.rx_dropped++;
1134                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1135                                                 goto done;
1136                         }
1137                         skb_put_data(skb, pskb->data, new_len);
1138
1139                         skb_reset_mac_header(skb);
1140                         skb->dev = pskb->dev;
1141                         skb->protocol = pskb->protocol;
1142                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1143                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1144                         ch->pdu_seq++;
1145
1146                         if (do_debug_data) {
1147                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1148                                                 __func__, ch->pdu_seq);
1149                                 ctcm_pr_debug("%s: skb:%0lx "
1150                                         "skb len: %d \n", __func__,
1151                                         (unsigned long)skb, skb->len);
1152                                 ctcm_pr_debug("%s: up to 32 bytes "
1153                                         "of pdu_data sent\n", __func__);
1154                                 ctcmpc_dump32((char *)skb->data, skb->len);
1155                         }
1156
1157                         skblen = skb->len;
1158                         sendrc = netif_rx(skb);
1159                         priv->stats.rx_packets++;
1160                         priv->stats.rx_bytes += skblen;
1161                         skb_pull(pskb, new_len); /* point to next PDU */
1162                 }
1163         } else {
1164                 mpcginfo = kmalloc(sizeof(struct mpcg_info), GFP_ATOMIC);
1165                 if (mpcginfo == NULL)
1166                                         goto done;
1167
1168                 mpcginfo->ch = ch;
1169                 mpcginfo->th = header;
1170                 mpcginfo->skb = pskb;
1171                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1172                                         __func__);
1173                 /*  it's a sweep?   */
1174                 sweep = (struct th_sweep *)pskb->data;
1175                 mpcginfo->sweep = sweep;
1176                 if (header->th_ch_flag == TH_SWEEP_REQ)
1177                         mpc_rcvd_sweep_req(mpcginfo);
1178                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1179                         mpc_rcvd_sweep_resp(mpcginfo);
1180                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1181                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1182                         skb_pull(pskb, XID2_LENGTH);
1183                         mpcginfo->xid = thisxid;
1184                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1185                 } else if (header->th_blk_flag == TH_DISCONTACT)
1186                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1187                 else if (header->th_seq_num != 0) {
1188                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1189                                 "%s(%s): control pkt expected\n",
1190                                                 CTCM_FUNTAIL, dev->name);
1191                         priv->stats.rx_dropped++;
1192                         /* mpcginfo only used for non-data transfers */
1193                         if (do_debug_data)
1194                                 ctcmpc_dump_skb(pskb, -8);
1195                 }
1196                 kfree(mpcginfo);
1197         }
1198 done:
1199
1200         dev_kfree_skb_any(pskb);
1201         if (sendrc == NET_RX_DROP) {
1202                 dev_warn(&dev->dev,
1203                         "The network backlog for %s is exceeded, "
1204                         "package dropped\n", __func__);
1205                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1206         }
1207
1208         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1209                         __func__, dev->name, ch, ch->id);
1210 }
1211
1212 /*
1213  * tasklet helper for mpc's skb unpacking.
1214  *
1215  * ch           The channel to work on.
1216  * Allow flow control back pressure to occur here.
1217  * Throttling back channel can result in excessive
1218  * channel inactivity and system deact of channel
1219  */
1220 void ctcmpc_bh(unsigned long thischan)
1221 {
1222         struct channel    *ch   = (struct channel *)thischan;
1223         struct sk_buff    *skb;
1224         struct net_device *dev  = ch->netdev;
1225         struct ctcm_priv  *priv = dev->ml_priv;
1226         struct mpc_group  *grp  = priv->mpcg;
1227
1228         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1229                dev->name, smp_processor_id(), __func__, ch->id);
1230         /* caller has requested driver to throttle back */
1231         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1232                         (skb = skb_dequeue(&ch->io_queue))) {
1233                 ctcmpc_unpack_skb(ch, skb);
1234                 if (grp->out_of_sequence > 20) {
1235                         /* assume data loss has occurred if */
1236                         /* missing seq_num for extended     */
1237                         /* period of time                   */
1238                         grp->out_of_sequence = 0;
1239                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1240                         break;
1241                 }
1242                 if (skb == skb_peek(&ch->io_queue))
1243                         break;
1244         }
1245         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1246                         __func__, dev->name, ch, ch->id);
1247         return;
1248 }
1249
1250 /*
1251  *  MPC Group Initializations
1252  */
1253 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1254 {
1255         struct mpc_group *grp;
1256
1257         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1258                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1259
1260         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1261         if (grp == NULL)
1262                 return NULL;
1263
1264         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1265                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1266                         mpcg_fsm_len, GFP_KERNEL);
1267         if (grp->fsm == NULL) {
1268                 kfree(grp);
1269                 return NULL;
1270         }
1271
1272         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1273         fsm_settimer(grp->fsm, &grp->timer);
1274
1275         grp->xid_skb =
1276                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1277         if (grp->xid_skb == NULL) {
1278                 kfree_fsm(grp->fsm);
1279                 kfree(grp);
1280                 return NULL;
1281         }
1282         /*  base xid for all channels in group  */
1283         grp->xid_skb_data = grp->xid_skb->data;
1284         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1285         skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1286
1287         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1288         skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1289         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1290         grp->xid->xid2_sender_id = jiffies;
1291
1292         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1293         skb_put_data(grp->xid_skb, "VTAM", 4);
1294
1295         grp->rcvd_xid_skb =
1296                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1297         if (grp->rcvd_xid_skb == NULL) {
1298                 kfree_fsm(grp->fsm);
1299                 dev_kfree_skb(grp->xid_skb);
1300                 kfree(grp);
1301                 return NULL;
1302         }
1303         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1304         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1305         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1306         grp->saved_xid2 = NULL;
1307         priv->xid = grp->xid;
1308         priv->mpcg = grp;
1309         return grp;
1310 }
1311
1312 /*
1313  * The MPC Group Station FSM
1314  */
1315
1316 /*
1317  * MPC Group Station FSM actions
1318  * CTCM_PROTO_MPC only
1319  */
1320
1321 /*
1322  * NOP action for statemachines
1323  */
1324 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1325 {
1326 }
1327
1328 /*
1329  * invoked when the device transitions to dev_stopped
1330  * MPC will stop each individual channel if a single XID failure
1331  * occurs, or will intitiate all channels be stopped if a GROUP
1332  * level failure occurs.
1333  */
1334 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1335 {
1336         struct net_device  *dev = arg;
1337         struct ctcm_priv    *priv;
1338         struct mpc_group *grp;
1339         struct channel *wch;
1340
1341         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1342
1343         priv  = dev->ml_priv;
1344         grp =  priv->mpcg;
1345         grp->flow_off_called = 0;
1346         fsm_deltimer(&grp->timer);
1347         if (grp->channels_terminating)
1348                         return;
1349
1350         grp->channels_terminating = 1;
1351         grp->saved_state = fsm_getstate(grp->fsm);
1352         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1353         if (grp->saved_state > MPCG_STATE_XID7INITF)
1354                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1355                         "%s(%s): MPC GROUP INOPERATIVE",
1356                                 CTCM_FUNTAIL, dev->name);
1357         if ((grp->saved_state != MPCG_STATE_RESET) ||
1358                 /* dealloc_channel has been called */
1359                 (grp->port_persist == 0))
1360                 fsm_deltimer(&priv->restart_timer);
1361
1362         wch = priv->channel[CTCM_WRITE];
1363
1364         switch (grp->saved_state) {
1365         case MPCG_STATE_RESET:
1366         case MPCG_STATE_INOP:
1367         case MPCG_STATE_XID2INITW:
1368         case MPCG_STATE_XID0IOWAIT:
1369         case MPCG_STATE_XID2INITX:
1370         case MPCG_STATE_XID7INITW:
1371         case MPCG_STATE_XID7INITX:
1372         case MPCG_STATE_XID0IOWAIX:
1373         case MPCG_STATE_XID7INITI:
1374         case MPCG_STATE_XID7INITZ:
1375         case MPCG_STATE_XID7INITF:
1376                 break;
1377         case MPCG_STATE_FLOWC:
1378         case MPCG_STATE_READY:
1379         default:
1380                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1381         }
1382
1383         grp->xid2_tgnum = 0;
1384         grp->group_max_buflen = 0;  /*min of all received */
1385         grp->outstanding_xid2 = 0;
1386         grp->outstanding_xid7 = 0;
1387         grp->outstanding_xid7_p2 = 0;
1388         grp->saved_xid2 = NULL;
1389         grp->xidnogood = 0;
1390         grp->changed_side = 0;
1391
1392         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1393         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1394         grp->rcvd_xid_skb->len = 0;
1395         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1396         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1397
1398         if (grp->send_qllc_disc == 1) {
1399                 grp->send_qllc_disc = 0;
1400                 mpc_send_qllc_discontact(dev);
1401         }
1402
1403         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1404         /* This can result in INOP of VTAM PU due to halting of  */
1405         /* outstanding IO which causes a sense to be returned    */
1406         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1407         /* become unreachable without manual intervention        */
1408         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1409                 grp->alloc_called = 0;
1410                 fsm_deltimer(&priv->restart_timer);
1411                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1412                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1413                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1414                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1415                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1416                                         CTCM_FUNTAIL, dev->name);
1417         } else {
1418                 fsm_deltimer(&priv->restart_timer);
1419                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1420                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1421                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1422                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1423                                                 CTCM_FUNTAIL, dev->name);
1424         }
1425 }
1426
1427 /*
1428  * Handle mpc group  action timeout.
1429  * MPC Group Station FSM action
1430  * CTCM_PROTO_MPC only
1431  *
1432  * fi           An instance of an mpc_group fsm.
1433  * event        The event, just happened.
1434  * arg          Generic pointer, casted from net_device * upon call.
1435  */
1436 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1437 {
1438         struct net_device *dev = arg;
1439         struct ctcm_priv *priv;
1440         struct mpc_group *grp;
1441         struct channel *wch;
1442         struct channel *rch;
1443
1444         priv = dev->ml_priv;
1445         grp = priv->mpcg;
1446         wch = priv->channel[CTCM_WRITE];
1447         rch = priv->channel[CTCM_READ];
1448
1449         switch (fsm_getstate(grp->fsm)) {
1450         case MPCG_STATE_XID2INITW:
1451                 /* Unless there is outstanding IO on the  */
1452                 /* channel just return and wait for ATTN  */
1453                 /* interrupt to begin XID negotiations    */
1454                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1455                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1456                         break;
1457                 fallthrough;
1458         default:
1459                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1460         }
1461
1462         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1463                         "%s: dev=%s exit",
1464                         CTCM_FUNTAIL, dev->name);
1465         return;
1466 }
1467
1468 /*
1469  * MPC Group Station FSM action
1470  * CTCM_PROTO_MPC only
1471  */
1472 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1473 {
1474         struct mpcg_info   *mpcginfo   = arg;
1475         struct channel     *ch         = mpcginfo->ch;
1476         struct net_device  *dev;
1477         struct ctcm_priv   *priv;
1478         struct mpc_group   *grp;
1479
1480         if (ch) {
1481                 dev = ch->netdev;
1482                 if (dev) {
1483                         priv = dev->ml_priv;
1484                         if (priv) {
1485                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1486                                         "%s: %s: %s\n",
1487                                         CTCM_FUNTAIL, dev->name, ch->id);
1488                                 grp = priv->mpcg;
1489                                 grp->send_qllc_disc = 1;
1490                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1491                         }
1492                 }
1493         }
1494
1495         return;
1496 }
1497
1498 /*
1499  * MPC Group Station - not part of FSM
1500  * CTCM_PROTO_MPC only
1501  * called from add_channel in ctcm_main.c
1502  */
1503 void mpc_action_send_discontact(unsigned long thischan)
1504 {
1505         int rc;
1506         struct channel  *ch = (struct channel *)thischan;
1507         unsigned long   saveflags = 0;
1508
1509         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1510         rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1511         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1512
1513         if (rc != 0) {
1514                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1515         }
1516
1517         return;
1518 }
1519
1520
1521 /*
1522  * helper function of mpc FSM
1523  * CTCM_PROTO_MPC only
1524  * mpc_action_rcvd_xid7
1525 */
1526 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1527 {
1528         struct channel     *ch   = mpcginfo->ch;
1529         struct net_device  *dev  = ch->netdev;
1530         struct ctcm_priv   *priv = dev->ml_priv;
1531         struct mpc_group   *grp  = priv->mpcg;
1532         struct xid2        *xid  = mpcginfo->xid;
1533         int     rc       = 0;
1534         __u64   our_id   = 0;
1535         __u64   their_id = 0;
1536         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1537
1538         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1539
1540         if (xid == NULL) {
1541                 rc = 1;
1542                 /* XID REJECTED: xid == NULL */
1543                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1544                         "%s(%s): xid = NULL",
1545                                 CTCM_FUNTAIL, ch->id);
1546                         goto done;
1547         }
1548
1549         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1550
1551         /*the received direction should be the opposite of ours  */
1552         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1553                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1554                 rc = 2;
1555                 /* XID REJECTED: r/w channel pairing mismatch */
1556                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1557                         "%s(%s): r/w channel pairing mismatch",
1558                                 CTCM_FUNTAIL, ch->id);
1559                         goto done;
1560         }
1561
1562         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1563                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1564                                 grp->group_max_buflen, xid->xid2_buf_len);
1565
1566                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1567                                                 xid->xid2_buf_len - len)
1568                         grp->group_max_buflen = xid->xid2_buf_len - len;
1569         }
1570
1571         if (grp->saved_xid2 == NULL) {
1572                 grp->saved_xid2 =
1573                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1574
1575                 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1576                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1577
1578                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1579                 grp->rcvd_xid_skb->len = 0;
1580
1581                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1582                 our_id = (__u64)priv->xid->xid2_adj_id;
1583                 our_id = our_id << 32;
1584                 our_id = our_id + priv->xid->xid2_sender_id;
1585                 their_id = (__u64)xid->xid2_adj_id;
1586                 their_id = their_id << 32;
1587                 their_id = their_id + xid->xid2_sender_id;
1588                 /* lower id assume the xside role */
1589                 if (our_id < their_id) {
1590                         grp->roll = XSIDE;
1591                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1592                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1593                                         CTCM_FUNTAIL, ch->id);
1594                 } else {
1595                         grp->roll = YSIDE;
1596                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1597                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1598                                         CTCM_FUNTAIL, ch->id);
1599                 }
1600
1601         } else {
1602                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1603                         rc = 3;
1604                         /* XID REJECTED: xid flag byte4 mismatch */
1605                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1606                                 "%s(%s): xid flag byte4 mismatch",
1607                                         CTCM_FUNTAIL, ch->id);
1608                 }
1609                 if (xid->xid2_flag2 == 0x40) {
1610                         rc = 4;
1611                         /* XID REJECTED - xid NOGOOD */
1612                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1613                                 "%s(%s): xid NOGOOD",
1614                                         CTCM_FUNTAIL, ch->id);
1615                 }
1616                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1617                         rc = 5;
1618                         /* XID REJECTED - Adjacent Station ID Mismatch */
1619                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620                                 "%s(%s): Adjacent Station ID Mismatch",
1621                                         CTCM_FUNTAIL, ch->id);
1622                 }
1623                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1624                         rc = 6;
1625                         /* XID REJECTED - Sender Address Mismatch */
1626                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627                                 "%s(%s): Sender Address Mismatch",
1628                                         CTCM_FUNTAIL, ch->id);
1629                 }
1630         }
1631 done:
1632         if (rc) {
1633                 dev_warn(&dev->dev,
1634                         "The XID used in the MPC protocol is not valid, "
1635                         "rc = %d\n", rc);
1636                 priv->xid->xid2_flag2 = 0x40;
1637                 grp->saved_xid2->xid2_flag2 = 0x40;
1638         }
1639
1640         return rc;
1641 }
1642
1643 /*
1644  * MPC Group Station FSM action
1645  * CTCM_PROTO_MPC only
1646  */
1647 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1648 {
1649         struct channel *ch = arg;
1650         int rc = 0;
1651         int gotlock = 0;
1652         unsigned long saveflags = 0;    /* avoids compiler warning with
1653                                            spin_unlock_irqrestore */
1654
1655         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1656                         __func__, smp_processor_id(), ch, ch->id);
1657
1658         if (ctcm_checkalloc_buffer(ch))
1659                                         goto done;
1660
1661         /*
1662          * skb data-buffer referencing:
1663          */
1664         ch->trans_skb->data = ch->trans_skb_data;
1665         skb_reset_tail_pointer(ch->trans_skb);
1666         ch->trans_skb->len = 0;
1667         /* result of the previous 3 statements is NOT always
1668          * already set after ctcm_checkalloc_buffer
1669          * because of possible reuse of the trans_skb
1670          */
1671         memset(ch->trans_skb->data, 0, 16);
1672         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1673         /* check is main purpose here: */
1674         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1675         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1676         /* check is main purpose here: */
1677         skb_put(ch->trans_skb, XID2_LENGTH);
1678         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1679         /* cleanup back to startpoint */
1680         ch->trans_skb->data = ch->trans_skb_data;
1681         skb_reset_tail_pointer(ch->trans_skb);
1682         ch->trans_skb->len = 0;
1683
1684         /* non-checking rewrite of above skb data-buffer referencing: */
1685         /*
1686         memset(ch->trans_skb->data, 0, 16);
1687         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1688         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1689         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1690          */
1691
1692         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1693         ch->ccw[8].count        = 0;
1694         ch->ccw[8].cda          = 0x00;
1695
1696         if (!(ch->xid_th && ch->xid && ch->xid_id))
1697                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1698                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1699                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1700
1701         if (side == XSIDE) {
1702                 /* mpc_action_xside_xid */
1703                 if (ch->xid_th == NULL)
1704                                 goto done;
1705                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1706                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1707                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1708                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1709
1710                 if (ch->xid == NULL)
1711                                 goto done;
1712                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1713                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1714                 ch->ccw[10].count       = XID2_LENGTH;
1715                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1716
1717                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1718                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1719                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1720                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1721
1722                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1723                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1724                 ch->ccw[12].count       = XID2_LENGTH;
1725                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1726
1727                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1728                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1729
1730         } else { /* side == YSIDE : mpc_action_yside_xid */
1731                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1732                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1733                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1734                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1735
1736                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1737                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1738                 ch->ccw[10].count       = XID2_LENGTH;
1739                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1740
1741                 if (ch->xid_th == NULL)
1742                                 goto done;
1743                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1744                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1745                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1746                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1747
1748                 if (ch->xid == NULL)
1749                                 goto done;
1750                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1751                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1752                 ch->ccw[12].count       = XID2_LENGTH;
1753                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1754
1755                 if (ch->xid_id == NULL)
1756                                 goto done;
1757                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1758                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1759
1760         }
1761         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1762         ch->ccw[13].count       = 4;
1763
1764         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1765         ch->ccw[14].flags       = CCW_FLAG_SLI;
1766         ch->ccw[14].count       = 0;
1767         ch->ccw[14].cda         = 0;
1768
1769         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1770         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1771         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1772         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1773
1774         if (!in_hardirq()) {
1775                          /* Such conditional locking is a known problem for
1776                           * sparse because its static undeterministic.
1777                           * Warnings should be ignored here. */
1778                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1779                 gotlock = 1;
1780         }
1781
1782         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1783         rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1784
1785         if (gotlock)    /* see remark above about conditional locking */
1786                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1787
1788         if (rc != 0) {
1789                 ctcm_ccw_check_rc(ch, rc,
1790                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1791         }
1792
1793 done:
1794         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1795                                 __func__, ch, ch->id);
1796         return;
1797
1798 }
1799
1800 /*
1801  * MPC Group Station FSM action
1802  * CTCM_PROTO_MPC only
1803  */
1804 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1805 {
1806         mpc_action_side_xid(fsm, arg, XSIDE);
1807 }
1808
1809 /*
1810  * MPC Group Station FSM action
1811  * CTCM_PROTO_MPC only
1812  */
1813 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1814 {
1815         mpc_action_side_xid(fsm, arg, YSIDE);
1816 }
1817
1818 /*
1819  * MPC Group Station FSM action
1820  * CTCM_PROTO_MPC only
1821  */
1822 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1823 {
1824         struct channel     *ch   = arg;
1825         struct net_device  *dev  = ch->netdev;
1826         struct ctcm_priv   *priv = dev->ml_priv;
1827         struct mpc_group   *grp  = priv->mpcg;
1828
1829         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1830                         __func__, smp_processor_id(), ch, ch->id);
1831
1832         if (ch->xid == NULL) {
1833                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1834                         "%s(%s): ch->xid == NULL",
1835                                 CTCM_FUNTAIL, dev->name);
1836                 return;
1837         }
1838
1839         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1840
1841         ch->xid->xid2_option =  XID2_0;
1842
1843         switch (fsm_getstate(grp->fsm)) {
1844         case MPCG_STATE_XID2INITW:
1845         case MPCG_STATE_XID2INITX:
1846                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1847                 break;
1848         case MPCG_STATE_XID0IOWAIT:
1849         case MPCG_STATE_XID0IOWAIX:
1850                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1851                 break;
1852         }
1853
1854         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1855
1856         return;
1857 }
1858
1859 /*
1860  * MPC Group Station FSM action
1861  * CTCM_PROTO_MPC only
1862 */
1863 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1864 {
1865         struct net_device *dev = arg;
1866         struct ctcm_priv  *priv = dev->ml_priv;
1867         struct mpc_group  *grp  = NULL;
1868         int direction;
1869         int send = 0;
1870
1871         if (priv)
1872                 grp = priv->mpcg;
1873         if (grp == NULL)
1874                 return;
1875
1876         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1877                 struct channel *ch = priv->channel[direction];
1878                 struct xid2 *thisxid = ch->xid;
1879                 ch->xid_skb->data = ch->xid_skb_data;
1880                 skb_reset_tail_pointer(ch->xid_skb);
1881                 ch->xid_skb->len = 0;
1882                 thisxid->xid2_option = XID2_7;
1883                 send = 0;
1884
1885                 /* xid7 phase 1 */
1886                 if (grp->outstanding_xid7_p2 > 0) {
1887                         if (grp->roll == YSIDE) {
1888                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1889                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1890                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1891                                         skb_put_data(ch->xid_skb, &thdummy,
1892                                                      TH_HEADER_LENGTH);
1893                                         send = 1;
1894                                 }
1895                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1896                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1897                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1898                                         skb_put_data(ch->xid_skb, &thnorm,
1899                                                      TH_HEADER_LENGTH);
1900                                         send = 1;
1901                         }
1902                 } else {
1903                         /* xid7 phase 2 */
1904                         if (grp->roll == YSIDE) {
1905                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1906                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1907                                         skb_put_data(ch->xid_skb, &thnorm,
1908                                                      TH_HEADER_LENGTH);
1909                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1910                                         send = 1;
1911                                 }
1912                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1913                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1914                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1915                                 skb_put_data(ch->xid_skb, &thdummy,
1916                                              TH_HEADER_LENGTH);
1917                                 send = 1;
1918                         }
1919                 }
1920
1921                 if (send)
1922                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1923         }
1924
1925         return;
1926 }
1927
1928 /*
1929  * MPC Group Station FSM action
1930  * CTCM_PROTO_MPC only
1931  */
1932 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1933 {
1934
1935         struct mpcg_info   *mpcginfo  = arg;
1936         struct channel     *ch   = mpcginfo->ch;
1937         struct net_device  *dev  = ch->netdev;
1938         struct ctcm_priv   *priv = dev->ml_priv;
1939         struct mpc_group   *grp  = priv->mpcg;
1940
1941         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1942                         __func__, ch->id, grp->outstanding_xid2,
1943                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1944
1945         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1946                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1947
1948         grp->outstanding_xid2--;
1949         grp->outstanding_xid7++;
1950         grp->outstanding_xid7_p2++;
1951
1952         /* must change state before validating xid to */
1953         /* properly handle interim interrupts received*/
1954         switch (fsm_getstate(grp->fsm)) {
1955         case MPCG_STATE_XID2INITW:
1956                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1957                 mpc_validate_xid(mpcginfo);
1958                 break;
1959         case MPCG_STATE_XID0IOWAIT:
1960                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1961                 mpc_validate_xid(mpcginfo);
1962                 break;
1963         case MPCG_STATE_XID2INITX:
1964                 if (grp->outstanding_xid2 == 0) {
1965                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1966                         mpc_validate_xid(mpcginfo);
1967                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1968                 }
1969                 break;
1970         case MPCG_STATE_XID0IOWAIX:
1971                 if (grp->outstanding_xid2 == 0) {
1972                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1973                         mpc_validate_xid(mpcginfo);
1974                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1975                 }
1976                 break;
1977         }
1978
1979         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1980                 __func__, ch->id, grp->outstanding_xid2,
1981                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1982         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1983                 __func__, ch->id,
1984                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1985         return;
1986
1987 }
1988
1989
1990 /*
1991  * MPC Group Station FSM action
1992  * CTCM_PROTO_MPC only
1993  */
1994 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
1995 {
1996         struct mpcg_info   *mpcginfo   = arg;
1997         struct channel     *ch         = mpcginfo->ch;
1998         struct net_device  *dev        = ch->netdev;
1999         struct ctcm_priv   *priv    = dev->ml_priv;
2000         struct mpc_group   *grp     = priv->mpcg;
2001
2002         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2003                 __func__, smp_processor_id(), ch, ch->id);
2004         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2005                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2006
2007         grp->outstanding_xid7--;
2008         ch->xid_skb->data = ch->xid_skb_data;
2009         skb_reset_tail_pointer(ch->xid_skb);
2010         ch->xid_skb->len = 0;
2011
2012         switch (fsm_getstate(grp->fsm)) {
2013         case MPCG_STATE_XID7INITI:
2014                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2015                 mpc_validate_xid(mpcginfo);
2016                 break;
2017         case MPCG_STATE_XID7INITW:
2018                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2019                 mpc_validate_xid(mpcginfo);
2020                 break;
2021         case MPCG_STATE_XID7INITZ:
2022         case MPCG_STATE_XID7INITX:
2023                 if (grp->outstanding_xid7 == 0) {
2024                         if (grp->outstanding_xid7_p2 > 0) {
2025                                 grp->outstanding_xid7 =
2026                                         grp->outstanding_xid7_p2;
2027                                 grp->outstanding_xid7_p2 = 0;
2028                         } else
2029                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2030
2031                         mpc_validate_xid(mpcginfo);
2032                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2033                         break;
2034                 }
2035                 mpc_validate_xid(mpcginfo);
2036                 break;
2037         }
2038         return;
2039 }
2040
2041 /*
2042  * mpc_action helper of an MPC Group Station FSM action
2043  * CTCM_PROTO_MPC only
2044  */
2045 static int mpc_send_qllc_discontact(struct net_device *dev)
2046 {
2047         struct sk_buff   *skb;
2048         struct qllc      *qllcptr;
2049         struct ctcm_priv *priv = dev->ml_priv;
2050         struct mpc_group *grp = priv->mpcg;
2051
2052         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2053                 __func__, mpcg_state_names[grp->saved_state]);
2054
2055         switch (grp->saved_state) {
2056         /*
2057          * establish conn callback function is
2058          * preferred method to report failure
2059          */
2060         case MPCG_STATE_XID0IOWAIT:
2061         case MPCG_STATE_XID0IOWAIX:
2062         case MPCG_STATE_XID7INITI:
2063         case MPCG_STATE_XID7INITZ:
2064         case MPCG_STATE_XID2INITW:
2065         case MPCG_STATE_XID2INITX:
2066         case MPCG_STATE_XID7INITW:
2067         case MPCG_STATE_XID7INITX:
2068                 if (grp->estconnfunc) {
2069                         grp->estconnfunc(grp->port_num, -1, 0);
2070                         grp->estconnfunc = NULL;
2071                         break;
2072                 }
2073                 fallthrough;
2074         case MPCG_STATE_FLOWC:
2075         case MPCG_STATE_READY:
2076                 grp->send_qllc_disc = 2;
2077
2078                 skb = __dev_alloc_skb(sizeof(struct qllc), GFP_ATOMIC);
2079                 if (skb == NULL) {
2080                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2081                                 "%s(%s): skb allocation error",
2082                                                 CTCM_FUNTAIL, dev->name);
2083                         priv->stats.rx_dropped++;
2084                         return -ENOMEM;
2085                 }
2086
2087                 qllcptr = skb_put(skb, sizeof(struct qllc));
2088                 qllcptr->qllc_address = 0xcc;
2089                 qllcptr->qllc_commands = 0x03;
2090
2091                 if (skb_headroom(skb) < 4) {
2092                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2093                                 "%s(%s): skb_headroom error",
2094                                                 CTCM_FUNTAIL, dev->name);
2095                         dev_kfree_skb_any(skb);
2096                         return -ENOMEM;
2097                 }
2098
2099                 *((__u32 *)skb_push(skb, 4)) =
2100                         priv->channel[CTCM_READ]->pdu_seq;
2101                 priv->channel[CTCM_READ]->pdu_seq++;
2102                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2103                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2104
2105                 /* receipt of CC03 resets anticipated sequence number on
2106                       receiving side */
2107                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2108                 skb_reset_mac_header(skb);
2109                 skb->dev = dev;
2110                 skb->protocol = htons(ETH_P_SNAP);
2111                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2112
2113                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2114
2115                 netif_rx(skb);
2116                 break;
2117         default:
2118                 break;
2119
2120         }
2121
2122         return 0;
2123 }
2124 /* --- This is the END my friend --- */
2125