drivers/s390/net/ctcm_mpc.c

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