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 = kmalloc(sizeof(struct th_sweep), gfp_type());
 657
 658         if (!header) {
 659                 dev_kfree_skb_any(sweep_skb);
 660                 goto done;
 661         }
 662
 663         header->th.th_seg       = 0x00 ;
 664         header->th.th_ch_flag   = TH_SWEEP_RESP;
 665         header->th.th_blk_flag  = 0x00;
 666         header->th.th_is_xid    = 0x00;
 667         header->th.th_seq_num   = 0x00;
 668         header->sw.th_last_seq  = ch->th_seq_num;
 669
 670         skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 671
 672         kfree(header);
 673
 674         netif_trans_update(dev);
 675         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 676
 677         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 678
 679         return;
 680
 681 done:
 682         grp->in_sweep = 0;
 683         ctcm_clear_busy_do(dev);
 684         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 685
 686         return;
 687 }
 688
 689 /*
 690  * helper function of ctcmpc_unpack_skb
 691  */
 692 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 693 {
 694         struct channel    *rch     = mpcginfo->ch;
 695         struct net_device *dev     = rch->netdev;
 696         struct ctcm_priv  *priv = dev->ml_priv;
 697         struct mpc_group  *grp  = priv->mpcg;
 698         struct channel    *ch      = priv->channel[CTCM_WRITE];
 699
 700         if (do_debug)
 701                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 702                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 703
 704         if (grp->in_sweep == 0) {
 705                 grp->in_sweep = 1;
 706                 ctcm_test_and_set_busy(dev);
 707                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 708                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 709         }
 710
 711         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 712
 713         grp->sweep_req_pend_num--;
 714         ctcmpc_send_sweep_resp(ch);
 715         kfree(mpcginfo);
 716         return;
 717 }
 718
 719 /*
 720   * MPC Group Station FSM definitions
 721  */
 722 static const char *mpcg_event_names[] = {
 723         [MPCG_EVENT_INOP]       = "INOP Condition",
 724         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 725         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 726         [MPCG_EVENT_XID2]       = "XID2 Received",
 727         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 728         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 729         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 730         [MPCG_EVENT_DOIO]       = "XID DoIO",
 731 };
 732
 733 static const char *mpcg_state_names[] = {
 734         [MPCG_STATE_RESET]      = "Reset",
 735         [MPCG_STATE_INOP]       = "INOP",
 736         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 737         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 738         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 739         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 740         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 741         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 742         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 743         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 744         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 745         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 746         [MPCG_STATE_READY]      = "READY",
 747 };
 748
 749 /*
 750  * The MPC Group Station FSM
 751  *   22 events
 752  */
 753 static const fsm_node mpcg_fsm[] = {
 754         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 755         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 756         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 757
 758         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 759         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 760
 761         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 762         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 763         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 764         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 765         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 766
 767         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 768         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 769         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 770         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 771         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 772
 773         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 774         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 775         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 776         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 777         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 778         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 779         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 780
 781         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 782         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 783         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 784         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 785         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 786         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 787
 788         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 789         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 790         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 791         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 792         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 793         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 794
 795         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 796         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 797         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 798         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 799         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 800         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 801
 802         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 803         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 804         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 805         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 806         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 807         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 808         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 809
 810         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 811         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 812         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 813         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 814         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 815         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 816
 817         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 818         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 819 };
 820
 821 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 822
 823 /*
 824  * MPC Group Station FSM action
 825  * CTCM_PROTO_MPC only
 826  */
 827 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 828 {
 829         struct net_device *dev = arg;
 830         struct ctcm_priv *priv = dev->ml_priv;
 831         struct mpc_group *grp = priv->mpcg;
 832
 833         if (grp == NULL) {
 834                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 835                         "%s(%s): No MPC group",
 836                                 CTCM_FUNTAIL, dev->name);
 837                 return;
 838         }
 839
 840         fsm_deltimer(&grp->timer);
 841
 842         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 843                 priv->xid->xid2_flag2 = 0x00;
 844                 if (grp->estconnfunc) {
 845                         grp->estconnfunc(grp->port_num, 1,
 846                                         grp->group_max_buflen);
 847                         grp->estconnfunc = NULL;
 848                 } else if (grp->allochanfunc)
 849                         grp->send_qllc_disc = 1;
 850
 851                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 852                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 853                                 "%s(%s): fails",
 854                                         CTCM_FUNTAIL, dev->name);
 855                 return;
 856         }
 857
 858         grp->port_persist = 1;
 859         grp->out_of_sequence = 0;
 860         grp->estconn_called = 0;
 861
 862         tasklet_hi_schedule(&grp->mpc_tasklet2);
 863
 864         return;
 865 }
 866
 867 /*
 868  * helper of ctcm_init_netdevice
 869  * CTCM_PROTO_MPC only
 870  */
 871 void mpc_group_ready(unsigned long adev)
 872 {
 873         struct net_device *dev = (struct net_device *)adev;
 874         struct ctcm_priv *priv = dev->ml_priv;
 875         struct mpc_group *grp = priv->mpcg;
 876         struct channel *ch = NULL;
 877
 878         if (grp == NULL) {
 879                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 880                         "%s(%s): No MPC group",
 881                                 CTCM_FUNTAIL, dev->name);
 882                 return;
 883         }
 884
 885         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 886                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 887                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 888
 889         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 890
 891         /* Put up a read on the channel */
 892         ch = priv->channel[CTCM_READ];
 893         ch->pdu_seq = 0;
 894         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 895                         __func__, ch->pdu_seq);
 896
 897         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 898         /* Put the write channel in idle state */
 899         ch = priv->channel[CTCM_WRITE];
 900         if (ch->collect_len > 0) {
 901                 spin_lock(&ch->collect_lock);
 902                 ctcm_purge_skb_queue(&ch->collect_queue);
 903                 ch->collect_len = 0;
 904                 spin_unlock(&ch->collect_lock);
 905         }
 906         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 907         ctcm_clear_busy(dev);
 908
 909         if (grp->estconnfunc) {
 910                 grp->estconnfunc(grp->port_num, 0,
 911                                     grp->group_max_buflen);
 912                 grp->estconnfunc = NULL;
 913         } else  if (grp->allochanfunc)
 914                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 915
 916         grp->send_qllc_disc = 1;
 917         grp->changed_side = 0;
 918
 919         return;
 920
 921 }
 922
 923 /*
 924  * Increment the MPC Group Active Channel Counts
 925  * helper of dev_action (called from channel fsm)
 926  */
 927 void mpc_channel_action(struct channel *ch, int direction, int action)
 928 {
 929         struct net_device  *dev  = ch->netdev;
 930         struct ctcm_priv   *priv = dev->ml_priv;
 931         struct mpc_group   *grp  = priv->mpcg;
 932
 933         if (grp == NULL) {
 934                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 935                         "%s(%s): No MPC group",
 936                                 CTCM_FUNTAIL, dev->name);
 937                 return;
 938         }
 939
 940         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 941
 942         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 943                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 944                 "read=%i, write=%i\n", __func__, action,
 945                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 946                 grp->active_channels[CTCM_READ],
 947                 grp->active_channels[CTCM_WRITE]);
 948
 949         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 950                 grp->num_channel_paths++;
 951                 grp->active_channels[direction]++;
 952                 grp->outstanding_xid2++;
 953                 ch->in_mpcgroup = 1;
 954
 955                 if (ch->xid_skb != NULL)
 956                         dev_kfree_skb_any(ch->xid_skb);
 957
 958                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 959                                         GFP_ATOMIC | GFP_DMA);
 960                 if (ch->xid_skb == NULL) {
 961                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 962                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 963                                 CTCM_FUNTAIL, dev->name);
 964                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 965                         return;
 966                 }
 967                 ch->xid_skb_data = ch->xid_skb->data;
 968                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 969                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 970                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 971                 skb_put(ch->xid_skb, XID2_LENGTH);
 972                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 973                 ch->xid_skb->data = ch->xid_skb_data;
 974                 skb_reset_tail_pointer(ch->xid_skb);
 975                 ch->xid_skb->len = 0;
 976
 977                 skb_put_data(ch->xid_skb, grp->xid_skb->data,
 978                              grp->xid_skb->len);
 979
 980                 ch->xid->xid2_dlc_type =
 981                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 982                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 983
 984                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 985                         ch->xid->xid2_buf_len = 0x00;
 986
 987                 ch->xid_skb->data = ch->xid_skb_data;
 988                 skb_reset_tail_pointer(ch->xid_skb);
 989                 ch->xid_skb->len = 0;
 990
 991                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 992
 993                 if ((grp->active_channels[CTCM_READ] > 0) &&
 994                     (grp->active_channels[CTCM_WRITE] > 0) &&
 995                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 996                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 997                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 998                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
 999                                                 __func__, dev->name);
1000                 }
1001         } else if ((action == MPC_CHANNEL_REMOVE) &&
1002                         (ch->in_mpcgroup == 1)) {
1003                 ch->in_mpcgroup = 0;
1004                 grp->num_channel_paths--;
1005                 grp->active_channels[direction]--;
1006
1007                 if (ch->xid_skb != NULL)
1008                         dev_kfree_skb_any(ch->xid_skb);
1009                 ch->xid_skb = NULL;
1010
1011                 if (grp->channels_terminating)
1012                                         goto done;
1013
1014                 if (((grp->active_channels[CTCM_READ] == 0) &&
1015                                         (grp->active_channels[CTCM_WRITE] > 0))
1016                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1017                                         (grp->active_channels[CTCM_READ] > 0)))
1018                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1019         }
1020 done:
1021         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1022                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1023                 "read=%i, write=%i\n", __func__, action,
1024                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1025                 grp->active_channels[CTCM_READ],
1026                 grp->active_channels[CTCM_WRITE]);
1027
1028         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1029 }
1030
1031 /**
1032  * Unpack a just received skb and hand it over to
1033  * upper layers.
1034  * special MPC version of unpack_skb.
1035  *
1036  * ch           The channel where this skb has been received.
1037  * pskb         The received skb.
1038  */
1039 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1040 {
1041         struct net_device *dev  = ch->netdev;
1042         struct ctcm_priv *priv = dev->ml_priv;
1043         struct mpc_group *grp = priv->mpcg;
1044         struct pdu *curr_pdu;
1045         struct mpcg_info *mpcginfo;
1046         struct th_header *header = NULL;
1047         struct th_sweep *sweep = NULL;
1048         int pdu_last_seen = 0;
1049         __u32 new_len;
1050         struct sk_buff *skb;
1051         int skblen;
1052         int sendrc = 0;
1053
1054         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1055                         __func__, dev->name, smp_processor_id(), ch->id);
1056
1057         header = (struct th_header *)pskb->data;
1058         if ((header->th_seg == 0) &&
1059                 (header->th_ch_flag == 0) &&
1060                 (header->th_blk_flag == 0) &&
1061                 (header->th_seq_num == 0))
1062                 /* nothing for us */    goto done;
1063
1064         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1065         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1066         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1067
1068         pskb->dev = dev;
1069         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1070         skb_pull(pskb, TH_HEADER_LENGTH);
1071
1072         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1073                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1074                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1075                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1076                     (header->th_seq_num != ch->th_seq_num + 1) &&
1077                     (ch->th_seq_num != 0))) {
1078                         /* This is NOT the next segment         *
1079                          * we are not the correct race winner   *
1080                          * go away and let someone else win     *
1081                          * BUT..this only applies if xid negot  *
1082                          * is done                              *
1083                         */
1084                         grp->out_of_sequence += 1;
1085                         __skb_push(pskb, TH_HEADER_LENGTH);
1086                         skb_queue_tail(&ch->io_queue, pskb);
1087                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1088                                         "got:%08x\n", __func__,
1089                                 ch->th_seq_num + 1, header->th_seq_num);
1090
1091                         return;
1092                 }
1093                 grp->out_of_sequence = 0;
1094                 ch->th_seq_num = header->th_seq_num;
1095
1096                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1097                                         __func__, ch->th_seq_num);
1098
1099                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1100                                         goto done;
1101                 while ((pskb->len > 0) && !pdu_last_seen) {
1102                         curr_pdu = (struct pdu *)pskb->data;
1103
1104                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1105                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1106                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1107                                                 __func__, pskb->len);
1108
1109                         skb_pull(pskb, PDU_HEADER_LENGTH);
1110
1111                         if (curr_pdu->pdu_flag & PDU_LAST)
1112                                 pdu_last_seen = 1;
1113                         if (curr_pdu->pdu_flag & PDU_CNTL)
1114                                 pskb->protocol = htons(ETH_P_SNAP);
1115                         else
1116                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1117
1118                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1119                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1120                                         "%s(%s): Dropping packet with "
1121                                         "illegal siize %d",
1122                                         CTCM_FUNTAIL, dev->name, pskb->len);
1123
1124                                 priv->stats.rx_dropped++;
1125                                 priv->stats.rx_length_errors++;
1126                                         goto done;
1127                         }
1128                         skb_reset_mac_header(pskb);
1129                         new_len = curr_pdu->pdu_offset;
1130                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1131                                                 __func__, new_len);
1132                         if ((new_len == 0) || (new_len > pskb->len)) {
1133                                 /* should never happen              */
1134                                 /* pskb len must be hosed...bail out */
1135                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1136                                         "%s(%s): non valid pdu_offset: %04x",
1137                                         /* "data may be lost", */
1138                                         CTCM_FUNTAIL, dev->name, new_len);
1139                                 goto done;
1140                         }
1141                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1142
1143                         if (!skb) {
1144                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1145                                         "%s(%s): MEMORY allocation error",
1146                                                 CTCM_FUNTAIL, dev->name);
1147                                 priv->stats.rx_dropped++;
1148                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1149                                                 goto done;
1150                         }
1151                         skb_put_data(skb, pskb->data, new_len);
1152
1153                         skb_reset_mac_header(skb);
1154                         skb->dev = pskb->dev;
1155                         skb->protocol = pskb->protocol;
1156                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1157                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1158                         ch->pdu_seq++;
1159
1160                         if (do_debug_data) {
1161                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1162                                                 __func__, ch->pdu_seq);
1163                                 ctcm_pr_debug("%s: skb:%0lx "
1164                                         "skb len: %d \n", __func__,
1165                                         (unsigned long)skb, skb->len);
1166                                 ctcm_pr_debug("%s: up to 32 bytes "
1167                                         "of pdu_data sent\n", __func__);
1168                                 ctcmpc_dump32((char *)skb->data, skb->len);
1169                         }
1170
1171                         skblen = skb->len;
1172                         sendrc = netif_rx(skb);
1173                         priv->stats.rx_packets++;
1174                         priv->stats.rx_bytes += skblen;
1175                         skb_pull(pskb, new_len); /* point to next PDU */
1176                 }
1177         } else {
1178                 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1179                 if (mpcginfo == NULL)
1180                                         goto done;
1181
1182                 mpcginfo->ch = ch;
1183                 mpcginfo->th = header;
1184                 mpcginfo->skb = pskb;
1185                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1186                                         __func__);
1187                 /*  it's a sweep?   */
1188                 sweep = (struct th_sweep *)pskb->data;
1189                 mpcginfo->sweep = sweep;
1190                 if (header->th_ch_flag == TH_SWEEP_REQ)
1191                         mpc_rcvd_sweep_req(mpcginfo);
1192                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1193                         mpc_rcvd_sweep_resp(mpcginfo);
1194                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1195                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1196                         skb_pull(pskb, XID2_LENGTH);
1197                         mpcginfo->xid = thisxid;
1198                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1199                 } else if (header->th_blk_flag == TH_DISCONTACT)
1200                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1201                 else if (header->th_seq_num != 0) {
1202                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1203                                 "%s(%s): control pkt expected\n",
1204                                                 CTCM_FUNTAIL, dev->name);
1205                         priv->stats.rx_dropped++;
1206                         /* mpcginfo only used for non-data transfers */
1207                         if (do_debug_data)
1208                                 ctcmpc_dump_skb(pskb, -8);
1209                 }
1210                 kfree(mpcginfo);
1211         }
1212 done:
1213
1214         dev_kfree_skb_any(pskb);
1215         if (sendrc == NET_RX_DROP) {
1216                 dev_warn(&dev->dev,
1217                         "The network backlog for %s is exceeded, "
1218                         "package dropped\n", __func__);
1219                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1220         }
1221
1222         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1223                         __func__, dev->name, ch, ch->id);
1224 }
1225
1226 /**
1227  * tasklet helper for mpc's skb unpacking.
1228  *
1229  * ch           The channel to work on.
1230  * Allow flow control back pressure to occur here.
1231  * Throttling back channel can result in excessive
1232  * channel inactivity and system deact of channel
1233  */
1234 void ctcmpc_bh(unsigned long thischan)
1235 {
1236         struct channel    *ch   = (struct channel *)thischan;
1237         struct sk_buff    *skb;
1238         struct net_device *dev  = ch->netdev;
1239         struct ctcm_priv  *priv = dev->ml_priv;
1240         struct mpc_group  *grp  = priv->mpcg;
1241
1242         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1243                dev->name, smp_processor_id(), __func__, ch->id);
1244         /* caller has requested driver to throttle back */
1245         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1246                         (skb = skb_dequeue(&ch->io_queue))) {
1247                 ctcmpc_unpack_skb(ch, skb);
1248                 if (grp->out_of_sequence > 20) {
1249                         /* assume data loss has occurred if */
1250                         /* missing seq_num for extended     */
1251                         /* period of time                   */
1252                         grp->out_of_sequence = 0;
1253                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1254                         break;
1255                 }
1256                 if (skb == skb_peek(&ch->io_queue))
1257                         break;
1258         }
1259         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1260                         __func__, dev->name, ch, ch->id);
1261         return;
1262 }
1263
1264 /*
1265  *  MPC Group Initializations
1266  */
1267 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1268 {
1269         struct mpc_group *grp;
1270
1271         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1272                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1273
1274         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1275         if (grp == NULL)
1276                 return NULL;
1277
1278         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1279                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1280                         mpcg_fsm_len, GFP_KERNEL);
1281         if (grp->fsm == NULL) {
1282                 kfree(grp);
1283                 return NULL;
1284         }
1285
1286         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1287         fsm_settimer(grp->fsm, &grp->timer);
1288
1289         grp->xid_skb =
1290                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1291         if (grp->xid_skb == NULL) {
1292                 kfree_fsm(grp->fsm);
1293                 kfree(grp);
1294                 return NULL;
1295         }
1296         /*  base xid for all channels in group  */
1297         grp->xid_skb_data = grp->xid_skb->data;
1298         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1299         skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1300
1301         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1302         skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1303         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1304         grp->xid->xid2_sender_id = jiffies;
1305
1306         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1307         skb_put_data(grp->xid_skb, "VTAM", 4);
1308
1309         grp->rcvd_xid_skb =
1310                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1311         if (grp->rcvd_xid_skb == NULL) {
1312                 kfree_fsm(grp->fsm);
1313                 dev_kfree_skb(grp->xid_skb);
1314                 kfree(grp);
1315                 return NULL;
1316         }
1317         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1318         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1319         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1320         grp->saved_xid2 = NULL;
1321         priv->xid = grp->xid;
1322         priv->mpcg = grp;
1323         return grp;
1324 }
1325
1326 /*
1327  * The MPC Group Station FSM
1328  */
1329
1330 /*
1331  * MPC Group Station FSM actions
1332  * CTCM_PROTO_MPC only
1333  */
1334
1335 /**
1336  * NOP action for statemachines
1337  */
1338 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1339 {
1340 }
1341
1342 /*
1343  * invoked when the device transitions to dev_stopped
1344  * MPC will stop each individual channel if a single XID failure
1345  * occurs, or will intitiate all channels be stopped if a GROUP
1346  * level failure occurs.
1347  */
1348 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1349 {
1350         struct net_device  *dev = arg;
1351         struct ctcm_priv    *priv;
1352         struct mpc_group *grp;
1353         struct channel *wch;
1354
1355         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1356
1357         priv  = dev->ml_priv;
1358         grp =  priv->mpcg;
1359         grp->flow_off_called = 0;
1360         fsm_deltimer(&grp->timer);
1361         if (grp->channels_terminating)
1362                         return;
1363
1364         grp->channels_terminating = 1;
1365         grp->saved_state = fsm_getstate(grp->fsm);
1366         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1367         if (grp->saved_state > MPCG_STATE_XID7INITF)
1368                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1369                         "%s(%s): MPC GROUP INOPERATIVE",
1370                                 CTCM_FUNTAIL, dev->name);
1371         if ((grp->saved_state != MPCG_STATE_RESET) ||
1372                 /* dealloc_channel has been called */
1373                 (grp->port_persist == 0))
1374                 fsm_deltimer(&priv->restart_timer);
1375
1376         wch = priv->channel[CTCM_WRITE];
1377
1378         switch (grp->saved_state) {
1379         case MPCG_STATE_RESET:
1380         case MPCG_STATE_INOP:
1381         case MPCG_STATE_XID2INITW:
1382         case MPCG_STATE_XID0IOWAIT:
1383         case MPCG_STATE_XID2INITX:
1384         case MPCG_STATE_XID7INITW:
1385         case MPCG_STATE_XID7INITX:
1386         case MPCG_STATE_XID0IOWAIX:
1387         case MPCG_STATE_XID7INITI:
1388         case MPCG_STATE_XID7INITZ:
1389         case MPCG_STATE_XID7INITF:
1390                 break;
1391         case MPCG_STATE_FLOWC:
1392         case MPCG_STATE_READY:
1393         default:
1394                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1395         }
1396
1397         grp->xid2_tgnum = 0;
1398         grp->group_max_buflen = 0;  /*min of all received */
1399         grp->outstanding_xid2 = 0;
1400         grp->outstanding_xid7 = 0;
1401         grp->outstanding_xid7_p2 = 0;
1402         grp->saved_xid2 = NULL;
1403         grp->xidnogood = 0;
1404         grp->changed_side = 0;
1405
1406         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1407         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1408         grp->rcvd_xid_skb->len = 0;
1409         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1410         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1411
1412         if (grp->send_qllc_disc == 1) {
1413                 grp->send_qllc_disc = 0;
1414                 mpc_send_qllc_discontact(dev);
1415         }
1416
1417         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1418         /* This can result in INOP of VTAM PU due to halting of  */
1419         /* outstanding IO which causes a sense to be returned    */
1420         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1421         /* become unreachable without manual intervention        */
1422         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1423                 grp->alloc_called = 0;
1424                 fsm_deltimer(&priv->restart_timer);
1425                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1426                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1427                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1428                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1429                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1430                                         CTCM_FUNTAIL, dev->name);
1431         } else {
1432                 fsm_deltimer(&priv->restart_timer);
1433                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1434                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1435                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1436                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1437                                                 CTCM_FUNTAIL, dev->name);
1438         }
1439 }
1440
1441 /**
1442  * Handle mpc group  action timeout.
1443  * MPC Group Station FSM action
1444  * CTCM_PROTO_MPC only
1445  *
1446  * fi           An instance of an mpc_group fsm.
1447  * event        The event, just happened.
1448  * arg          Generic pointer, casted from net_device * upon call.
1449  */
1450 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1451 {
1452         struct net_device *dev = arg;
1453         struct ctcm_priv *priv;
1454         struct mpc_group *grp;
1455         struct channel *wch;
1456         struct channel *rch;
1457
1458         priv = dev->ml_priv;
1459         grp = priv->mpcg;
1460         wch = priv->channel[CTCM_WRITE];
1461         rch = priv->channel[CTCM_READ];
1462
1463         switch (fsm_getstate(grp->fsm)) {
1464         case MPCG_STATE_XID2INITW:
1465                 /* Unless there is outstanding IO on the  */
1466                 /* channel just return and wait for ATTN  */
1467                 /* interrupt to begin XID negotiations    */
1468                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1469                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1470                         break;
1471                 fallthrough;
1472         default:
1473                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1474         }
1475
1476         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1477                         "%s: dev=%s exit",
1478                         CTCM_FUNTAIL, dev->name);
1479         return;
1480 }
1481
1482 /*
1483  * MPC Group Station FSM action
1484  * CTCM_PROTO_MPC only
1485  */
1486 void mpc_action_discontact(fsm_instance *fi, int event, void *arg)
1487 {
1488         struct mpcg_info   *mpcginfo   = arg;
1489         struct channel     *ch         = mpcginfo->ch;
1490         struct net_device  *dev;
1491         struct ctcm_priv   *priv;
1492         struct mpc_group   *grp;
1493
1494         if (ch) {
1495                 dev = ch->netdev;
1496                 if (dev) {
1497                         priv = dev->ml_priv;
1498                         if (priv) {
1499                                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1500                                         "%s: %s: %s\n",
1501                                         CTCM_FUNTAIL, dev->name, ch->id);
1502                                 grp = priv->mpcg;
1503                                 grp->send_qllc_disc = 1;
1504                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1505                         }
1506                 }
1507         }
1508
1509         return;
1510 }
1511
1512 /*
1513  * MPC Group Station - not part of FSM
1514  * CTCM_PROTO_MPC only
1515  * called from add_channel in ctcm_main.c
1516  */
1517 void mpc_action_send_discontact(unsigned long thischan)
1518 {
1519         int rc;
1520         struct channel  *ch = (struct channel *)thischan;
1521         unsigned long   saveflags = 0;
1522
1523         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1524         rc = ccw_device_start(ch->cdev, &ch->ccw[15], 0, 0xff, 0);
1525         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1526
1527         if (rc != 0) {
1528                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1529         }
1530
1531         return;
1532 }
1533
1534
1535 /*
1536  * helper function of mpc FSM
1537  * CTCM_PROTO_MPC only
1538  * mpc_action_rcvd_xid7
1539 */
1540 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1541 {
1542         struct channel     *ch   = mpcginfo->ch;
1543         struct net_device  *dev  = ch->netdev;
1544         struct ctcm_priv   *priv = dev->ml_priv;
1545         struct mpc_group   *grp  = priv->mpcg;
1546         struct xid2        *xid  = mpcginfo->xid;
1547         int     rc       = 0;
1548         __u64   our_id   = 0;
1549         __u64   their_id = 0;
1550         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1551
1552         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1553
1554         if (xid == NULL) {
1555                 rc = 1;
1556                 /* XID REJECTED: xid == NULL */
1557                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1558                         "%s(%s): xid = NULL",
1559                                 CTCM_FUNTAIL, ch->id);
1560                         goto done;
1561         }
1562
1563         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1564
1565         /*the received direction should be the opposite of ours  */
1566         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1567                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1568                 rc = 2;
1569                 /* XID REJECTED: r/w channel pairing mismatch */
1570                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1571                         "%s(%s): r/w channel pairing mismatch",
1572                                 CTCM_FUNTAIL, ch->id);
1573                         goto done;
1574         }
1575
1576         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1577                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1578                                 grp->group_max_buflen, xid->xid2_buf_len);
1579
1580                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1581                                                 xid->xid2_buf_len - len)
1582                         grp->group_max_buflen = xid->xid2_buf_len - len;
1583         }
1584
1585         if (grp->saved_xid2 == NULL) {
1586                 grp->saved_xid2 =
1587                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1588
1589                 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1590                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1591
1592                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1593                 grp->rcvd_xid_skb->len = 0;
1594
1595                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1596                 our_id = (__u64)priv->xid->xid2_adj_id;
1597                 our_id = our_id << 32;
1598                 our_id = our_id + priv->xid->xid2_sender_id;
1599                 their_id = (__u64)xid->xid2_adj_id;
1600                 their_id = their_id << 32;
1601                 their_id = their_id + xid->xid2_sender_id;
1602                 /* lower id assume the xside role */
1603                 if (our_id < their_id) {
1604                         grp->roll = XSIDE;
1605                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1606                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1607                                         CTCM_FUNTAIL, ch->id);
1608                 } else {
1609                         grp->roll = YSIDE;
1610                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1611                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1612                                         CTCM_FUNTAIL, ch->id);
1613                 }
1614
1615         } else {
1616                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1617                         rc = 3;
1618                         /* XID REJECTED: xid flag byte4 mismatch */
1619                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1620                                 "%s(%s): xid flag byte4 mismatch",
1621                                         CTCM_FUNTAIL, ch->id);
1622                 }
1623                 if (xid->xid2_flag2 == 0x40) {
1624                         rc = 4;
1625                         /* XID REJECTED - xid NOGOOD */
1626                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1627                                 "%s(%s): xid NOGOOD",
1628                                         CTCM_FUNTAIL, ch->id);
1629                 }
1630                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1631                         rc = 5;
1632                         /* XID REJECTED - Adjacent Station ID Mismatch */
1633                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1634                                 "%s(%s): Adjacent Station ID Mismatch",
1635                                         CTCM_FUNTAIL, ch->id);
1636                 }
1637                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1638                         rc = 6;
1639                         /* XID REJECTED - Sender Address Mismatch */
1640                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1641                                 "%s(%s): Sender Address Mismatch",
1642                                         CTCM_FUNTAIL, ch->id);
1643                 }
1644         }
1645 done:
1646         if (rc) {
1647                 dev_warn(&dev->dev,
1648                         "The XID used in the MPC protocol is not valid, "
1649                         "rc = %d\n", rc);
1650                 priv->xid->xid2_flag2 = 0x40;
1651                 grp->saved_xid2->xid2_flag2 = 0x40;
1652         }
1653
1654         return rc;
1655 }
1656
1657 /*
1658  * MPC Group Station FSM action
1659  * CTCM_PROTO_MPC only
1660  */
1661 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1662 {
1663         struct channel *ch = arg;
1664         int rc = 0;
1665         int gotlock = 0;
1666         unsigned long saveflags = 0;    /* avoids compiler warning with
1667                                            spin_unlock_irqrestore */
1668
1669         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1670                         __func__, smp_processor_id(), ch, ch->id);
1671
1672         if (ctcm_checkalloc_buffer(ch))
1673                                         goto done;
1674
1675         /*
1676          * skb data-buffer referencing:
1677          */
1678         ch->trans_skb->data = ch->trans_skb_data;
1679         skb_reset_tail_pointer(ch->trans_skb);
1680         ch->trans_skb->len = 0;
1681         /* result of the previous 3 statements is NOT always
1682          * already set after ctcm_checkalloc_buffer
1683          * because of possible reuse of the trans_skb
1684          */
1685         memset(ch->trans_skb->data, 0, 16);
1686         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1687         /* check is main purpose here: */
1688         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1689         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1690         /* check is main purpose here: */
1691         skb_put(ch->trans_skb, XID2_LENGTH);
1692         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1693         /* cleanup back to startpoint */
1694         ch->trans_skb->data = ch->trans_skb_data;
1695         skb_reset_tail_pointer(ch->trans_skb);
1696         ch->trans_skb->len = 0;
1697
1698         /* non-checking rewrite of above skb data-buffer referencing: */
1699         /*
1700         memset(ch->trans_skb->data, 0, 16);
1701         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1702         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1703         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1704          */
1705
1706         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1707         ch->ccw[8].count        = 0;
1708         ch->ccw[8].cda          = 0x00;
1709
1710         if (!(ch->xid_th && ch->xid && ch->xid_id))
1711                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1712                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1713                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1714
1715         if (side == XSIDE) {
1716                 /* mpc_action_xside_xid */
1717                 if (ch->xid_th == NULL)
1718                                 goto done;
1719                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1720                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1721                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1722                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1723
1724                 if (ch->xid == NULL)
1725                                 goto done;
1726                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1727                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1728                 ch->ccw[10].count       = XID2_LENGTH;
1729                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1730
1731                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1732                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1733                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1734                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1735
1736                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1737                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1738                 ch->ccw[12].count       = XID2_LENGTH;
1739                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1740
1741                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1742                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1743
1744         } else { /* side == YSIDE : mpc_action_yside_xid */
1745                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1746                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1747                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1748                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1749
1750                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1751                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1752                 ch->ccw[10].count       = XID2_LENGTH;
1753                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1754
1755                 if (ch->xid_th == NULL)
1756                                 goto done;
1757                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1758                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1759                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1760                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1761
1762                 if (ch->xid == NULL)
1763                                 goto done;
1764                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1765                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1766                 ch->ccw[12].count       = XID2_LENGTH;
1767                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1768
1769                 if (ch->xid_id == NULL)
1770                                 goto done;
1771                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1772                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1773
1774         }
1775         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1776         ch->ccw[13].count       = 4;
1777
1778         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1779         ch->ccw[14].flags       = CCW_FLAG_SLI;
1780         ch->ccw[14].count       = 0;
1781         ch->ccw[14].cda         = 0;
1782
1783         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1784         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1785         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1786         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1787
1788         if (!in_irq()) {
1789                          /* Such conditional locking is a known problem for
1790                           * sparse because its static undeterministic.
1791                           * Warnings should be ignored here. */
1792                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1793                 gotlock = 1;
1794         }
1795
1796         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1797         rc = ccw_device_start(ch->cdev, &ch->ccw[8], 0, 0xff, 0);
1798
1799         if (gotlock)    /* see remark above about conditional locking */
1800                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1801
1802         if (rc != 0) {
1803                 ctcm_ccw_check_rc(ch, rc,
1804                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1805         }
1806
1807 done:
1808         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1809                                 __func__, ch, ch->id);
1810         return;
1811
1812 }
1813
1814 /*
1815  * MPC Group Station FSM action
1816  * CTCM_PROTO_MPC only
1817  */
1818 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1819 {
1820         mpc_action_side_xid(fsm, arg, XSIDE);
1821 }
1822
1823 /*
1824  * MPC Group Station FSM action
1825  * CTCM_PROTO_MPC only
1826  */
1827 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1828 {
1829         mpc_action_side_xid(fsm, arg, YSIDE);
1830 }
1831
1832 /*
1833  * MPC Group Station FSM action
1834  * CTCM_PROTO_MPC only
1835  */
1836 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1837 {
1838         struct channel     *ch   = arg;
1839         struct net_device  *dev  = ch->netdev;
1840         struct ctcm_priv   *priv = dev->ml_priv;
1841         struct mpc_group   *grp  = priv->mpcg;
1842
1843         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1844                         __func__, smp_processor_id(), ch, ch->id);
1845
1846         if (ch->xid == NULL) {
1847                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1848                         "%s(%s): ch->xid == NULL",
1849                                 CTCM_FUNTAIL, dev->name);
1850                 return;
1851         }
1852
1853         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1854
1855         ch->xid->xid2_option =  XID2_0;
1856
1857         switch (fsm_getstate(grp->fsm)) {
1858         case MPCG_STATE_XID2INITW:
1859         case MPCG_STATE_XID2INITX:
1860                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1861                 break;
1862         case MPCG_STATE_XID0IOWAIT:
1863         case MPCG_STATE_XID0IOWAIX:
1864                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1865                 break;
1866         }
1867
1868         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1869
1870         return;
1871 }
1872
1873 /*
1874  * MPC Group Station FSM action
1875  * CTCM_PROTO_MPC only
1876 */
1877 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1878 {
1879         struct net_device *dev = arg;
1880         struct ctcm_priv  *priv = dev->ml_priv;
1881         struct mpc_group  *grp  = NULL;
1882         int direction;
1883         int send = 0;
1884
1885         if (priv)
1886                 grp = priv->mpcg;
1887         if (grp == NULL)
1888                 return;
1889
1890         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1891                 struct channel *ch = priv->channel[direction];
1892                 struct xid2 *thisxid = ch->xid;
1893                 ch->xid_skb->data = ch->xid_skb_data;
1894                 skb_reset_tail_pointer(ch->xid_skb);
1895                 ch->xid_skb->len = 0;
1896                 thisxid->xid2_option = XID2_7;
1897                 send = 0;
1898
1899                 /* xid7 phase 1 */
1900                 if (grp->outstanding_xid7_p2 > 0) {
1901                         if (grp->roll == YSIDE) {
1902                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1903                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1904                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1905                                         skb_put_data(ch->xid_skb, &thdummy,
1906                                                      TH_HEADER_LENGTH);
1907                                         send = 1;
1908                                 }
1909                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1910                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1911                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1912                                         skb_put_data(ch->xid_skb, &thnorm,
1913                                                      TH_HEADER_LENGTH);
1914                                         send = 1;
1915                         }
1916                 } else {
1917                         /* xid7 phase 2 */
1918                         if (grp->roll == YSIDE) {
1919                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1920                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1921                                         skb_put_data(ch->xid_skb, &thnorm,
1922                                                      TH_HEADER_LENGTH);
1923                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1924                                         send = 1;
1925                                 }
1926                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1927                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1928                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1929                                 skb_put_data(ch->xid_skb, &thdummy,
1930                                              TH_HEADER_LENGTH);
1931                                 send = 1;
1932                         }
1933                 }
1934
1935                 if (send)
1936                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1937         }
1938
1939         return;
1940 }
1941
1942 /*
1943  * MPC Group Station FSM action
1944  * CTCM_PROTO_MPC only
1945  */
1946 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1947 {
1948
1949         struct mpcg_info   *mpcginfo  = arg;
1950         struct channel     *ch   = mpcginfo->ch;
1951         struct net_device  *dev  = ch->netdev;
1952         struct ctcm_priv   *priv = dev->ml_priv;
1953         struct mpc_group   *grp  = priv->mpcg;
1954
1955         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1956                         __func__, ch->id, grp->outstanding_xid2,
1957                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1958
1959         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1960                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1961
1962         grp->outstanding_xid2--;
1963         grp->outstanding_xid7++;
1964         grp->outstanding_xid7_p2++;
1965
1966         /* must change state before validating xid to */
1967         /* properly handle interim interrupts received*/
1968         switch (fsm_getstate(grp->fsm)) {
1969         case MPCG_STATE_XID2INITW:
1970                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1971                 mpc_validate_xid(mpcginfo);
1972                 break;
1973         case MPCG_STATE_XID0IOWAIT:
1974                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1975                 mpc_validate_xid(mpcginfo);
1976                 break;
1977         case MPCG_STATE_XID2INITX:
1978                 if (grp->outstanding_xid2 == 0) {
1979                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1980                         mpc_validate_xid(mpcginfo);
1981                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1982                 }
1983                 break;
1984         case MPCG_STATE_XID0IOWAIX:
1985                 if (grp->outstanding_xid2 == 0) {
1986                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1987                         mpc_validate_xid(mpcginfo);
1988                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1989                 }
1990                 break;
1991         }
1992
1993         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1994                 __func__, ch->id, grp->outstanding_xid2,
1995                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1996         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
1997                 __func__, ch->id,
1998                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
1999         return;
2000
2001 }
2002
2003
2004 /*
2005  * MPC Group Station FSM action
2006  * CTCM_PROTO_MPC only
2007  */
2008 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2009 {
2010         struct mpcg_info   *mpcginfo   = arg;
2011         struct channel     *ch         = mpcginfo->ch;
2012         struct net_device  *dev        = ch->netdev;
2013         struct ctcm_priv   *priv    = dev->ml_priv;
2014         struct mpc_group   *grp     = priv->mpcg;
2015
2016         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2017                 __func__, smp_processor_id(), ch, ch->id);
2018         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2019                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2020
2021         grp->outstanding_xid7--;
2022         ch->xid_skb->data = ch->xid_skb_data;
2023         skb_reset_tail_pointer(ch->xid_skb);
2024         ch->xid_skb->len = 0;
2025
2026         switch (fsm_getstate(grp->fsm)) {
2027         case MPCG_STATE_XID7INITI:
2028                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2029                 mpc_validate_xid(mpcginfo);
2030                 break;
2031         case MPCG_STATE_XID7INITW:
2032                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2033                 mpc_validate_xid(mpcginfo);
2034                 break;
2035         case MPCG_STATE_XID7INITZ:
2036         case MPCG_STATE_XID7INITX:
2037                 if (grp->outstanding_xid7 == 0) {
2038                         if (grp->outstanding_xid7_p2 > 0) {
2039                                 grp->outstanding_xid7 =
2040                                         grp->outstanding_xid7_p2;
2041                                 grp->outstanding_xid7_p2 = 0;
2042                         } else
2043                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2044
2045                         mpc_validate_xid(mpcginfo);
2046                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2047                         break;
2048                 }
2049                 mpc_validate_xid(mpcginfo);
2050                 break;
2051         }
2052         return;
2053 }
2054
2055 /*
2056  * mpc_action helper of an MPC Group Station FSM action
2057  * CTCM_PROTO_MPC only
2058  */
2059 static int mpc_send_qllc_discontact(struct net_device *dev)
2060 {
2061         __u32   new_len = 0;
2062         struct sk_buff   *skb;
2063         struct qllc      *qllcptr;
2064         struct ctcm_priv *priv = dev->ml_priv;
2065         struct mpc_group *grp = priv->mpcg;
2066
2067         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2068                 __func__, mpcg_state_names[grp->saved_state]);
2069
2070         switch (grp->saved_state) {
2071         /*
2072          * establish conn callback function is
2073          * preferred method to report failure
2074          */
2075         case MPCG_STATE_XID0IOWAIT:
2076         case MPCG_STATE_XID0IOWAIX:
2077         case MPCG_STATE_XID7INITI:
2078         case MPCG_STATE_XID7INITZ:
2079         case MPCG_STATE_XID2INITW:
2080         case MPCG_STATE_XID2INITX:
2081         case MPCG_STATE_XID7INITW:
2082         case MPCG_STATE_XID7INITX:
2083                 if (grp->estconnfunc) {
2084                         grp->estconnfunc(grp->port_num, -1, 0);
2085                         grp->estconnfunc = NULL;
2086                         break;
2087                 }
2088                 fallthrough;
2089         case MPCG_STATE_FLOWC:
2090         case MPCG_STATE_READY:
2091                 grp->send_qllc_disc = 2;
2092                 new_len = sizeof(struct qllc);
2093                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2094                 if (qllcptr == NULL) {
2095                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2096                                 "%s(%s): qllcptr allocation error",
2097                                                 CTCM_FUNTAIL, dev->name);
2098                         return -ENOMEM;
2099                 }
2100
2101                 qllcptr->qllc_address = 0xcc;
2102                 qllcptr->qllc_commands = 0x03;
2103
2104                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2105
2106                 if (skb == NULL) {
2107                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2108                                 "%s(%s): skb allocation error",
2109                                                 CTCM_FUNTAIL, dev->name);
2110                         priv->stats.rx_dropped++;
2111                         kfree(qllcptr);
2112                         return -ENOMEM;
2113                 }
2114
2115                 skb_put_data(skb, qllcptr, new_len);
2116                 kfree(qllcptr);
2117
2118                 if (skb_headroom(skb) < 4) {
2119                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2120                                 "%s(%s): skb_headroom error",
2121                                                 CTCM_FUNTAIL, dev->name);
2122                         dev_kfree_skb_any(skb);
2123                         return -ENOMEM;
2124                 }
2125
2126                 *((__u32 *)skb_push(skb, 4)) =
2127                         priv->channel[CTCM_READ]->pdu_seq;
2128                 priv->channel[CTCM_READ]->pdu_seq++;
2129                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2130                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2131
2132                 /* receipt of CC03 resets anticipated sequence number on
2133                       receiving side */
2134                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2135                 skb_reset_mac_header(skb);
2136                 skb->dev = dev;
2137                 skb->protocol = htons(ETH_P_SNAP);
2138                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2139
2140                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2141
2142                 netif_rx(skb);
2143                 break;
2144         default:
2145                 break;
2146
2147         }
2148
2149         return 0;
2150 }
2151 /* --- This is the END my friend --- */
2152