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         case MPCG_STATE_XID0IOWAIT:
 361                 fsm_deltimer(&grp->timer);
 362                 grp->outstanding_xid2 = 0;
 363                 grp->outstanding_xid7 = 0;
 364                 grp->outstanding_xid7_p2 = 0;
 365                 grp->saved_xid2 = NULL;
 366                 if (callback)
 367                         ctcm_open(dev);
 368                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 369                 break;
 370         case MPCG_STATE_READY:
 371                 /* XID exchanges completed after PORT was activated */
 372                 /* Link station already active                      */
 373                 /* Maybe timing issue...retry callback              */
 374                 grp->allocchan_callback_retries++;
 375                 if (grp->allocchan_callback_retries < 4) {
 376                         if (grp->allochanfunc)
 377                                 grp->allochanfunc(grp->port_num,
 378                                                   grp->group_max_buflen);
 379                 } else {
 380                         /* there are problems...bail out            */
 381                         /* there may be a state mismatch so restart */
 382                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 383                         grp->allocchan_callback_retries = 0;
 384                 }
 385                 break;
 386         }
 387
 388         return 0;
 389 }
 390 EXPORT_SYMBOL(ctc_mpc_alloc_channel);
 391
 392 /*
 393  * ctc_mpc_establish_connectivity
 394  *      (exported interface)
 395  */
 396 void ctc_mpc_establish_connectivity(int port_num,
 397                                 void (*callback)(int, int, int))
 398 {
 399         struct net_device *dev;
 400         struct mpc_group *grp;
 401         struct ctcm_priv *priv;
 402         struct channel *rch, *wch;
 403
 404         dev = ctcmpc_get_dev(port_num);
 405         if (dev == NULL)
 406                 return;
 407         priv = dev->ml_priv;
 408         grp = priv->mpcg;
 409         rch = priv->channel[CTCM_READ];
 410         wch = priv->channel[CTCM_WRITE];
 411
 412         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
 413                         "%s(%s): state=%s",
 414                         CTCM_FUNTAIL, dev->name, fsm_getstate_str(grp->fsm));
 415
 416         grp->estconnfunc = callback;
 417         grp->port_num = port_num;
 418
 419         switch (fsm_getstate(grp->fsm)) {
 420         case MPCG_STATE_READY:
 421                 /* XID exchanges completed after PORT was activated */
 422                 /* Link station already active                      */
 423                 /* Maybe timing issue...retry callback              */
 424                 fsm_deltimer(&grp->timer);
 425                 grp->estconn_callback_retries++;
 426                 if (grp->estconn_callback_retries < 4) {
 427                         if (grp->estconnfunc) {
 428                                 grp->estconnfunc(grp->port_num, 0,
 429                                                 grp->group_max_buflen);
 430                                 grp->estconnfunc = NULL;
 431                         }
 432                 } else {
 433                         /* there are problems...bail out         */
 434                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 435                         grp->estconn_callback_retries = 0;
 436                 }
 437                 break;
 438         case MPCG_STATE_INOP:
 439         case MPCG_STATE_RESET:
 440                 /* MPC Group is not ready to start XID - min num of */
 441                 /* 1 read and 1 write channel have not been acquired*/
 442
 443                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 444                         "%s(%s): REJECTED - inactive channels",
 445                                         CTCM_FUNTAIL, dev->name);
 446                 if (grp->estconnfunc) {
 447                         grp->estconnfunc(grp->port_num, -1, 0);
 448                         grp->estconnfunc = NULL;
 449                 }
 450                 break;
 451         case MPCG_STATE_XID2INITW:
 452                 /* alloc channel was called but no XID exchange    */
 453                 /* has occurred. initiate xside XID exchange       */
 454                 /* make sure yside XID0 processing has not started */
 455
 456                 if ((fsm_getstate(rch->fsm) > CH_XID0_PENDING) ||
 457                         (fsm_getstate(wch->fsm) > CH_XID0_PENDING)) {
 458                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 459                                 "%s(%s): ABORT - PASSIVE XID",
 460                                         CTCM_FUNTAIL, dev->name);
 461                         break;
 462                 }
 463                 grp->send_qllc_disc = 1;
 464                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIT);
 465                 fsm_deltimer(&grp->timer);
 466                 fsm_addtimer(&grp->timer, MPC_XID_TIMEOUT_VALUE,
 467                                                 MPCG_EVENT_TIMER, dev);
 468                 grp->outstanding_xid7 = 0;
 469                 grp->outstanding_xid7_p2 = 0;
 470                 grp->saved_xid2 = NULL;
 471                 if ((rch->in_mpcgroup) &&
 472                                 (fsm_getstate(rch->fsm) == CH_XID0_PENDING))
 473                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, rch);
 474                 else {
 475                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 476                                 "%s(%s): RX-%s not ready for ACTIVE XID0",
 477                                         CTCM_FUNTAIL, dev->name, rch->id);
 478                         if (grp->estconnfunc) {
 479                                 grp->estconnfunc(grp->port_num, -1, 0);
 480                                 grp->estconnfunc = NULL;
 481                         }
 482                         fsm_deltimer(&grp->timer);
 483                                 goto done;
 484                 }
 485                 if ((wch->in_mpcgroup) &&
 486                                 (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
 487                         fsm_event(grp->fsm, MPCG_EVENT_XID0DO, wch);
 488                 else {
 489                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 490                                 "%s(%s): WX-%s not ready for ACTIVE XID0",
 491                                         CTCM_FUNTAIL, dev->name, wch->id);
 492                         if (grp->estconnfunc) {
 493                                 grp->estconnfunc(grp->port_num, -1, 0);
 494                                 grp->estconnfunc = NULL;
 495                         }
 496                         fsm_deltimer(&grp->timer);
 497                                 goto done;
 498                         }
 499                 break;
 500         case MPCG_STATE_XID0IOWAIT:
 501                 /* already in active XID negotiations */
 502         default:
 503                 break;
 504         }
 505
 506 done:
 507         CTCM_PR_DEBUG("Exit %s()\n", __func__);
 508         return;
 509 }
 510 EXPORT_SYMBOL(ctc_mpc_establish_connectivity);
 511
 512 /*
 513  * ctc_mpc_dealloc_ch
 514  *      (exported interface)
 515  */
 516 void ctc_mpc_dealloc_ch(int port_num)
 517 {
 518         struct net_device *dev;
 519         struct ctcm_priv *priv;
 520         struct mpc_group *grp;
 521
 522         dev = ctcmpc_get_dev(port_num);
 523         if (dev == NULL)
 524                 return;
 525         priv = dev->ml_priv;
 526         grp = priv->mpcg;
 527
 528         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_DEBUG,
 529                         "%s: %s: refcount = %d\n",
 530                         CTCM_FUNTAIL, dev->name, netdev_refcnt_read(dev));
 531
 532         fsm_deltimer(&priv->restart_timer);
 533         grp->channels_terminating = 0;
 534         fsm_deltimer(&grp->timer);
 535         grp->allochanfunc = NULL;
 536         grp->estconnfunc = NULL;
 537         grp->port_persist = 0;
 538         grp->send_qllc_disc = 0;
 539         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 540
 541         ctcm_close(dev);
 542         return;
 543 }
 544 EXPORT_SYMBOL(ctc_mpc_dealloc_ch);
 545
 546 /*
 547  * ctc_mpc_flow_control
 548  *      (exported interface)
 549  */
 550 void ctc_mpc_flow_control(int port_num, int flowc)
 551 {
 552         struct ctcm_priv *priv;
 553         struct mpc_group *grp;
 554         struct net_device *dev;
 555         struct channel *rch;
 556         int mpcg_state;
 557
 558         dev = ctcmpc_get_dev(port_num);
 559         if (dev == NULL)
 560                 return;
 561         priv = dev->ml_priv;
 562         grp = priv->mpcg;
 563
 564         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 565                         "%s: %s: flowc = %d",
 566                                 CTCM_FUNTAIL, dev->name, flowc);
 567
 568         rch = priv->channel[CTCM_READ];
 569
 570         mpcg_state = fsm_getstate(grp->fsm);
 571         switch (flowc) {
 572         case 1:
 573                 if (mpcg_state == MPCG_STATE_FLOWC)
 574                         break;
 575                 if (mpcg_state == MPCG_STATE_READY) {
 576                         if (grp->flow_off_called == 1)
 577                                 grp->flow_off_called = 0;
 578                         else
 579                                 fsm_newstate(grp->fsm, MPCG_STATE_FLOWC);
 580                         break;
 581                 }
 582                 break;
 583         case 0:
 584                 if (mpcg_state == MPCG_STATE_FLOWC) {
 585                         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 586                         /* ensure any data that has accumulated */
 587                         /* on the io_queue will now be sen t    */
 588                         tasklet_schedule(&rch->ch_tasklet);
 589                 }
 590                 /* possible race condition                      */
 591                 if (mpcg_state == MPCG_STATE_READY) {
 592                         grp->flow_off_called = 1;
 593                         break;
 594                 }
 595                 break;
 596         }
 597
 598 }
 599 EXPORT_SYMBOL(ctc_mpc_flow_control);
 600
 601 static int mpc_send_qllc_discontact(struct net_device *);
 602
 603 /*
 604  * helper function of ctcmpc_unpack_skb
 605 */
 606 static void mpc_rcvd_sweep_resp(struct mpcg_info *mpcginfo)
 607 {
 608         struct channel    *rch = mpcginfo->ch;
 609         struct net_device *dev = rch->netdev;
 610         struct ctcm_priv   *priv = dev->ml_priv;
 611         struct mpc_group  *grp = priv->mpcg;
 612         struct channel    *ch = priv->channel[CTCM_WRITE];
 613
 614         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 615         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 616
 617         grp->sweep_rsp_pend_num--;
 618
 619         if ((grp->sweep_req_pend_num == 0) &&
 620                         (grp->sweep_rsp_pend_num == 0)) {
 621                 fsm_deltimer(&ch->sweep_timer);
 622                 grp->in_sweep = 0;
 623                 rch->th_seq_num = 0x00;
 624                 ch->th_seq_num = 0x00;
 625                 ctcm_clear_busy_do(dev);
 626         }
 627
 628         kfree(mpcginfo);
 629
 630         return;
 631
 632 }
 633
 634 /*
 635  * helper function of mpc_rcvd_sweep_req
 636  * which is a helper of ctcmpc_unpack_skb
 637  */
 638 static void ctcmpc_send_sweep_resp(struct channel *rch)
 639 {
 640         struct net_device *dev = rch->netdev;
 641         struct ctcm_priv *priv = dev->ml_priv;
 642         struct mpc_group *grp = priv->mpcg;
 643         struct th_sweep *header;
 644         struct sk_buff *sweep_skb;
 645         struct channel *ch  = priv->channel[CTCM_WRITE];
 646
 647         CTCM_PR_DEBUG("%s: ch=0x%p id=%s\n", __func__, rch, rch->id);
 648
 649         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
 650         if (sweep_skb == NULL) {
 651                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 652                         "%s(%s): sweep_skb allocation ERROR\n",
 653                         CTCM_FUNTAIL, rch->id);
 654                 goto done;
 655         }
 656
 657         header = kmalloc(sizeof(struct th_sweep), gfp_type());
 658
 659         if (!header) {
 660                 dev_kfree_skb_any(sweep_skb);
 661                 goto done;
 662         }
 663
 664         header->th.th_seg       = 0x00 ;
 665         header->th.th_ch_flag   = TH_SWEEP_RESP;
 666         header->th.th_blk_flag  = 0x00;
 667         header->th.th_is_xid    = 0x00;
 668         header->th.th_seq_num   = 0x00;
 669         header->sw.th_last_seq  = ch->th_seq_num;
 670
 671         skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 672
 673         kfree(header);
 674
 675         netif_trans_update(dev);
 676         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 677
 678         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 679
 680         return;
 681
 682 done:
 683         grp->in_sweep = 0;
 684         ctcm_clear_busy_do(dev);
 685         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 686
 687         return;
 688 }
 689
 690 /*
 691  * helper function of ctcmpc_unpack_skb
 692  */
 693 static void mpc_rcvd_sweep_req(struct mpcg_info *mpcginfo)
 694 {
 695         struct channel    *rch     = mpcginfo->ch;
 696         struct net_device *dev     = rch->netdev;
 697         struct ctcm_priv  *priv = dev->ml_priv;
 698         struct mpc_group  *grp  = priv->mpcg;
 699         struct channel    *ch      = priv->channel[CTCM_WRITE];
 700
 701         if (do_debug)
 702                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
 703                         " %s(): ch=0x%p id=%s\n", __func__, ch, ch->id);
 704
 705         if (grp->in_sweep == 0) {
 706                 grp->in_sweep = 1;
 707                 ctcm_test_and_set_busy(dev);
 708                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 709                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 710         }
 711
 712         CTCM_D3_DUMP((char *)mpcginfo->sweep, TH_SWEEP_LENGTH);
 713
 714         grp->sweep_req_pend_num--;
 715         ctcmpc_send_sweep_resp(ch);
 716         kfree(mpcginfo);
 717         return;
 718 }
 719
 720 /*
 721   * MPC Group Station FSM definitions
 722  */
 723 static const char *mpcg_event_names[] = {
 724         [MPCG_EVENT_INOP]       = "INOP Condition",
 725         [MPCG_EVENT_DISCONC]    = "Discontact Received",
 726         [MPCG_EVENT_XID0DO]     = "Channel Active - Start XID",
 727         [MPCG_EVENT_XID2]       = "XID2 Received",
 728         [MPCG_EVENT_XID2DONE]   = "XID0 Complete",
 729         [MPCG_EVENT_XID7DONE]   = "XID7 Complete",
 730         [MPCG_EVENT_TIMER]      = "XID Setup Timer",
 731         [MPCG_EVENT_DOIO]       = "XID DoIO",
 732 };
 733
 734 static const char *mpcg_state_names[] = {
 735         [MPCG_STATE_RESET]      = "Reset",
 736         [MPCG_STATE_INOP]       = "INOP",
 737         [MPCG_STATE_XID2INITW]  = "Passive XID- XID0 Pending Start",
 738         [MPCG_STATE_XID2INITX]  = "Passive XID- XID0 Pending Complete",
 739         [MPCG_STATE_XID7INITW]  = "Passive XID- XID7 Pending P1 Start",
 740         [MPCG_STATE_XID7INITX]  = "Passive XID- XID7 Pending P2 Complete",
 741         [MPCG_STATE_XID0IOWAIT] = "Active  XID- XID0 Pending Start",
 742         [MPCG_STATE_XID0IOWAIX] = "Active  XID- XID0 Pending Complete",
 743         [MPCG_STATE_XID7INITI]  = "Active  XID- XID7 Pending Start",
 744         [MPCG_STATE_XID7INITZ]  = "Active  XID- XID7 Pending Complete ",
 745         [MPCG_STATE_XID7INITF]  = "XID        - XID7 Complete ",
 746         [MPCG_STATE_FLOWC]      = "FLOW CONTROL ON",
 747         [MPCG_STATE_READY]      = "READY",
 748 };
 749
 750 /*
 751  * The MPC Group Station FSM
 752  *   22 events
 753  */
 754 static const fsm_node mpcg_fsm[] = {
 755         { MPCG_STATE_RESET,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 756         { MPCG_STATE_INOP,      MPCG_EVENT_INOP,        mpc_action_nop        },
 757         { MPCG_STATE_FLOWC,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 758
 759         { MPCG_STATE_READY,     MPCG_EVENT_DISCONC,     mpc_action_discontact },
 760         { MPCG_STATE_READY,     MPCG_EVENT_INOP,        mpc_action_go_inop    },
 761
 762         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 763         { MPCG_STATE_XID2INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 764         { MPCG_STATE_XID2INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 765         { MPCG_STATE_XID2INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 766         { MPCG_STATE_XID2INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 767
 768         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID0DO,      mpc_action_doxid0     },
 769         { MPCG_STATE_XID2INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid0  },
 770         { MPCG_STATE_XID2INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 771         { MPCG_STATE_XID2INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 772         { MPCG_STATE_XID2INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 773
 774         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 775         { MPCG_STATE_XID7INITW, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 776         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 777         { MPCG_STATE_XID7INITW, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 778         { MPCG_STATE_XID7INITW, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 779         { MPCG_STATE_XID7INITW, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 780         { MPCG_STATE_XID7INITW, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 781
 782         { MPCG_STATE_XID7INITX, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 783         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 784         { MPCG_STATE_XID7INITX, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 785         { MPCG_STATE_XID7INITX, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 786         { MPCG_STATE_XID7INITX, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 787         { MPCG_STATE_XID7INITX, MPCG_EVENT_DOIO,        mpc_action_yside_xid  },
 788
 789         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 790         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 791         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 792         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 793         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 794         { MPCG_STATE_XID0IOWAIT, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 795
 796         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID0DO,     mpc_action_doxid0     },
 797         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DISCONC,    mpc_action_discontact },
 798         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_XID2,       mpc_action_rcvd_xid0  },
 799         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_INOP,       mpc_action_go_inop    },
 800         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_TIMER,      mpc_action_timeout    },
 801         { MPCG_STATE_XID0IOWAIX, MPCG_EVENT_DOIO,       mpc_action_xside_xid  },
 802
 803         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2DONE,    mpc_action_doxid7     },
 804         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 805         { MPCG_STATE_XID7INITI, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 806         { MPCG_STATE_XID7INITI, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 807         { MPCG_STATE_XID7INITI, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 808         { MPCG_STATE_XID7INITI, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 809         { MPCG_STATE_XID7INITI, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 810
 811         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID2,        mpc_action_rcvd_xid7  },
 812         { MPCG_STATE_XID7INITZ, MPCG_EVENT_XID7DONE,    mpc_action_doxid7     },
 813         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DISCONC,     mpc_action_discontact },
 814         { MPCG_STATE_XID7INITZ, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 815         { MPCG_STATE_XID7INITZ, MPCG_EVENT_TIMER,       mpc_action_timeout    },
 816         { MPCG_STATE_XID7INITZ, MPCG_EVENT_DOIO,        mpc_action_xside_xid  },
 817
 818         { MPCG_STATE_XID7INITF, MPCG_EVENT_INOP,        mpc_action_go_inop    },
 819         { MPCG_STATE_XID7INITF, MPCG_EVENT_XID7DONE,    mpc_action_go_ready   },
 820 };
 821
 822 static int mpcg_fsm_len = ARRAY_SIZE(mpcg_fsm);
 823
 824 /*
 825  * MPC Group Station FSM action
 826  * CTCM_PROTO_MPC only
 827  */
 828 static void mpc_action_go_ready(fsm_instance *fsm, int event, void *arg)
 829 {
 830         struct net_device *dev = arg;
 831         struct ctcm_priv *priv = dev->ml_priv;
 832         struct mpc_group *grp = priv->mpcg;
 833
 834         if (grp == NULL) {
 835                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 836                         "%s(%s): No MPC group",
 837                                 CTCM_FUNTAIL, dev->name);
 838                 return;
 839         }
 840
 841         fsm_deltimer(&grp->timer);
 842
 843         if (grp->saved_xid2->xid2_flag2 == 0x40) {
 844                 priv->xid->xid2_flag2 = 0x00;
 845                 if (grp->estconnfunc) {
 846                         grp->estconnfunc(grp->port_num, 1,
 847                                         grp->group_max_buflen);
 848                         grp->estconnfunc = NULL;
 849                 } else if (grp->allochanfunc)
 850                         grp->send_qllc_disc = 1;
 851
 852                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 853                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 854                                 "%s(%s): fails",
 855                                         CTCM_FUNTAIL, dev->name);
 856                 return;
 857         }
 858
 859         grp->port_persist = 1;
 860         grp->out_of_sequence = 0;
 861         grp->estconn_called = 0;
 862
 863         tasklet_hi_schedule(&grp->mpc_tasklet2);
 864
 865         return;
 866 }
 867
 868 /*
 869  * helper of ctcm_init_netdevice
 870  * CTCM_PROTO_MPC only
 871  */
 872 void mpc_group_ready(unsigned long adev)
 873 {
 874         struct net_device *dev = (struct net_device *)adev;
 875         struct ctcm_priv *priv = dev->ml_priv;
 876         struct mpc_group *grp = priv->mpcg;
 877         struct channel *ch = NULL;
 878
 879         if (grp == NULL) {
 880                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 881                         "%s(%s): No MPC group",
 882                                 CTCM_FUNTAIL, dev->name);
 883                 return;
 884         }
 885
 886         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 887                 "%s: %s: GROUP TRANSITIONED TO READY, maxbuf = %d\n",
 888                         CTCM_FUNTAIL, dev->name, grp->group_max_buflen);
 889
 890         fsm_newstate(grp->fsm, MPCG_STATE_READY);
 891
 892         /* Put up a read on the channel */
 893         ch = priv->channel[CTCM_READ];
 894         ch->pdu_seq = 0;
 895         CTCM_PR_DBGDATA("ctcmpc: %s() ToDCM_pdu_seq= %08x\n" ,
 896                         __func__, ch->pdu_seq);
 897
 898         ctcmpc_chx_rxidle(ch->fsm, CTC_EVENT_START, ch);
 899         /* Put the write channel in idle state */
 900         ch = priv->channel[CTCM_WRITE];
 901         if (ch->collect_len > 0) {
 902                 spin_lock(&ch->collect_lock);
 903                 ctcm_purge_skb_queue(&ch->collect_queue);
 904                 ch->collect_len = 0;
 905                 spin_unlock(&ch->collect_lock);
 906         }
 907         ctcm_chx_txidle(ch->fsm, CTC_EVENT_START, ch);
 908         ctcm_clear_busy(dev);
 909
 910         if (grp->estconnfunc) {
 911                 grp->estconnfunc(grp->port_num, 0,
 912                                     grp->group_max_buflen);
 913                 grp->estconnfunc = NULL;
 914         } else  if (grp->allochanfunc)
 915                 grp->allochanfunc(grp->port_num, grp->group_max_buflen);
 916
 917         grp->send_qllc_disc = 1;
 918         grp->changed_side = 0;
 919
 920         return;
 921
 922 }
 923
 924 /*
 925  * Increment the MPC Group Active Channel Counts
 926  * helper of dev_action (called from channel fsm)
 927  */
 928 void mpc_channel_action(struct channel *ch, int direction, int action)
 929 {
 930         struct net_device  *dev  = ch->netdev;
 931         struct ctcm_priv   *priv = dev->ml_priv;
 932         struct mpc_group   *grp  = priv->mpcg;
 933
 934         if (grp == NULL) {
 935                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 936                         "%s(%s): No MPC group",
 937                                 CTCM_FUNTAIL, dev->name);
 938                 return;
 939         }
 940
 941         CTCM_PR_DEBUG("enter %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
 942
 943         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
 944                 "%s: %i / Grp:%s total_channels=%i, active_channels: "
 945                 "read=%i, write=%i\n", __func__, action,
 946                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
 947                 grp->active_channels[CTCM_READ],
 948                 grp->active_channels[CTCM_WRITE]);
 949
 950         if ((action == MPC_CHANNEL_ADD) && (ch->in_mpcgroup == 0)) {
 951                 grp->num_channel_paths++;
 952                 grp->active_channels[direction]++;
 953                 grp->outstanding_xid2++;
 954                 ch->in_mpcgroup = 1;
 955
 956                 if (ch->xid_skb != NULL)
 957                         dev_kfree_skb_any(ch->xid_skb);
 958
 959                 ch->xid_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT,
 960                                         GFP_ATOMIC | GFP_DMA);
 961                 if (ch->xid_skb == NULL) {
 962                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 963                                 "%s(%s): Couldn't alloc ch xid_skb\n",
 964                                 CTCM_FUNTAIL, dev->name);
 965                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 966                         return;
 967                 }
 968                 ch->xid_skb_data = ch->xid_skb->data;
 969                 ch->xid_th = (struct th_header *)ch->xid_skb->data;
 970                 skb_put(ch->xid_skb, TH_HEADER_LENGTH);
 971                 ch->xid = (struct xid2 *)skb_tail_pointer(ch->xid_skb);
 972                 skb_put(ch->xid_skb, XID2_LENGTH);
 973                 ch->xid_id = skb_tail_pointer(ch->xid_skb);
 974                 ch->xid_skb->data = ch->xid_skb_data;
 975                 skb_reset_tail_pointer(ch->xid_skb);
 976                 ch->xid_skb->len = 0;
 977
 978                 skb_put_data(ch->xid_skb, grp->xid_skb->data,
 979                              grp->xid_skb->len);
 980
 981                 ch->xid->xid2_dlc_type =
 982                         ((CHANNEL_DIRECTION(ch->flags) == CTCM_READ)
 983                                 ? XID2_READ_SIDE : XID2_WRITE_SIDE);
 984
 985                 if (CHANNEL_DIRECTION(ch->flags) == CTCM_WRITE)
 986                         ch->xid->xid2_buf_len = 0x00;
 987
 988                 ch->xid_skb->data = ch->xid_skb_data;
 989                 skb_reset_tail_pointer(ch->xid_skb);
 990                 ch->xid_skb->len = 0;
 991
 992                 fsm_newstate(ch->fsm, CH_XID0_PENDING);
 993
 994                 if ((grp->active_channels[CTCM_READ] > 0) &&
 995                     (grp->active_channels[CTCM_WRITE] > 0) &&
 996                         (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
 997                         fsm_newstate(grp->fsm, MPCG_STATE_XID2INITW);
 998                         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_NOTICE,
 999                                 "%s: %s: MPC GROUP CHANNELS ACTIVE\n",
1000                                                 __func__, dev->name);
1001                 }
1002         } else if ((action == MPC_CHANNEL_REMOVE) &&
1003                         (ch->in_mpcgroup == 1)) {
1004                 ch->in_mpcgroup = 0;
1005                 grp->num_channel_paths--;
1006                 grp->active_channels[direction]--;
1007
1008                 if (ch->xid_skb != NULL)
1009                         dev_kfree_skb_any(ch->xid_skb);
1010                 ch->xid_skb = NULL;
1011
1012                 if (grp->channels_terminating)
1013                                         goto done;
1014
1015                 if (((grp->active_channels[CTCM_READ] == 0) &&
1016                                         (grp->active_channels[CTCM_WRITE] > 0))
1017                         || ((grp->active_channels[CTCM_WRITE] == 0) &&
1018                                         (grp->active_channels[CTCM_READ] > 0)))
1019                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1020         }
1021 done:
1022         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG,
1023                 "exit %s: %i / Grp:%s total_channels=%i, active_channels: "
1024                 "read=%i, write=%i\n", __func__, action,
1025                 fsm_getstate_str(grp->fsm), grp->num_channel_paths,
1026                 grp->active_channels[CTCM_READ],
1027                 grp->active_channels[CTCM_WRITE]);
1028
1029         CTCM_PR_DEBUG("exit %s: ch=0x%p id=%s\n", __func__, ch, ch->id);
1030 }
1031
1032 /**
1033  * Unpack a just received skb and hand it over to
1034  * upper layers.
1035  * special MPC version of unpack_skb.
1036  *
1037  * ch           The channel where this skb has been received.
1038  * pskb         The received skb.
1039  */
1040 static void ctcmpc_unpack_skb(struct channel *ch, struct sk_buff *pskb)
1041 {
1042         struct net_device *dev  = ch->netdev;
1043         struct ctcm_priv *priv = dev->ml_priv;
1044         struct mpc_group *grp = priv->mpcg;
1045         struct pdu *curr_pdu;
1046         struct mpcg_info *mpcginfo;
1047         struct th_header *header = NULL;
1048         struct th_sweep *sweep = NULL;
1049         int pdu_last_seen = 0;
1050         __u32 new_len;
1051         struct sk_buff *skb;
1052         int skblen;
1053         int sendrc = 0;
1054
1055         CTCM_PR_DEBUG("ctcmpc enter: %s() %s cp:%i ch:%s\n",
1056                         __func__, dev->name, smp_processor_id(), ch->id);
1057
1058         header = (struct th_header *)pskb->data;
1059         if ((header->th_seg == 0) &&
1060                 (header->th_ch_flag == 0) &&
1061                 (header->th_blk_flag == 0) &&
1062                 (header->th_seq_num == 0))
1063                 /* nothing for us */    goto done;
1064
1065         CTCM_PR_DBGDATA("%s: th_header\n", __func__);
1066         CTCM_D3_DUMP((char *)header, TH_HEADER_LENGTH);
1067         CTCM_PR_DBGDATA("%s: pskb len: %04x \n", __func__, pskb->len);
1068
1069         pskb->dev = dev;
1070         pskb->ip_summed = CHECKSUM_UNNECESSARY;
1071         skb_pull(pskb, TH_HEADER_LENGTH);
1072
1073         if (likely(header->th_ch_flag == TH_HAS_PDU)) {
1074                 CTCM_PR_DBGDATA("%s: came into th_has_pdu\n", __func__);
1075                 if ((fsm_getstate(grp->fsm) == MPCG_STATE_FLOWC) ||
1076                    ((fsm_getstate(grp->fsm) == MPCG_STATE_READY) &&
1077                     (header->th_seq_num != ch->th_seq_num + 1) &&
1078                     (ch->th_seq_num != 0))) {
1079                         /* This is NOT the next segment         *
1080                          * we are not the correct race winner   *
1081                          * go away and let someone else win     *
1082                          * BUT..this only applies if xid negot  *
1083                          * is done                              *
1084                         */
1085                         grp->out_of_sequence += 1;
1086                         __skb_push(pskb, TH_HEADER_LENGTH);
1087                         skb_queue_tail(&ch->io_queue, pskb);
1088                         CTCM_PR_DBGDATA("%s: th_seq_num expect:%08x "
1089                                         "got:%08x\n", __func__,
1090                                 ch->th_seq_num + 1, header->th_seq_num);
1091
1092                         return;
1093                 }
1094                 grp->out_of_sequence = 0;
1095                 ch->th_seq_num = header->th_seq_num;
1096
1097                 CTCM_PR_DBGDATA("ctcmpc: %s() FromVTAM_th_seq=%08x\n",
1098                                         __func__, ch->th_seq_num);
1099
1100                 if (unlikely(fsm_getstate(grp->fsm) != MPCG_STATE_READY))
1101                                         goto done;
1102                 while ((pskb->len > 0) && !pdu_last_seen) {
1103                         curr_pdu = (struct pdu *)pskb->data;
1104
1105                         CTCM_PR_DBGDATA("%s: pdu_header\n", __func__);
1106                         CTCM_D3_DUMP((char *)pskb->data, PDU_HEADER_LENGTH);
1107                         CTCM_PR_DBGDATA("%s: pskb len: %04x \n",
1108                                                 __func__, pskb->len);
1109
1110                         skb_pull(pskb, PDU_HEADER_LENGTH);
1111
1112                         if (curr_pdu->pdu_flag & PDU_LAST)
1113                                 pdu_last_seen = 1;
1114                         if (curr_pdu->pdu_flag & PDU_CNTL)
1115                                 pskb->protocol = htons(ETH_P_SNAP);
1116                         else
1117                                 pskb->protocol = htons(ETH_P_SNA_DIX);
1118
1119                         if ((pskb->len <= 0) || (pskb->len > ch->max_bufsize)) {
1120                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1121                                         "%s(%s): Dropping packet with "
1122                                         "illegal siize %d",
1123                                         CTCM_FUNTAIL, dev->name, pskb->len);
1124
1125                                 priv->stats.rx_dropped++;
1126                                 priv->stats.rx_length_errors++;
1127                                         goto done;
1128                         }
1129                         skb_reset_mac_header(pskb);
1130                         new_len = curr_pdu->pdu_offset;
1131                         CTCM_PR_DBGDATA("%s: new_len: %04x \n",
1132                                                 __func__, new_len);
1133                         if ((new_len == 0) || (new_len > pskb->len)) {
1134                                 /* should never happen              */
1135                                 /* pskb len must be hosed...bail out */
1136                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1137                                         "%s(%s): non valid pdu_offset: %04x",
1138                                         /* "data may be lost", */
1139                                         CTCM_FUNTAIL, dev->name, new_len);
1140                                 goto done;
1141                         }
1142                         skb = __dev_alloc_skb(new_len+4, GFP_ATOMIC);
1143
1144                         if (!skb) {
1145                                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1146                                         "%s(%s): MEMORY allocation error",
1147                                                 CTCM_FUNTAIL, dev->name);
1148                                 priv->stats.rx_dropped++;
1149                                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1150                                                 goto done;
1151                         }
1152                         skb_put_data(skb, pskb->data, new_len);
1153
1154                         skb_reset_mac_header(skb);
1155                         skb->dev = pskb->dev;
1156                         skb->protocol = pskb->protocol;
1157                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1158                         *((__u32 *) skb_push(skb, 4)) = ch->pdu_seq;
1159                         ch->pdu_seq++;
1160
1161                         if (do_debug_data) {
1162                                 ctcm_pr_debug("%s: ToDCM_pdu_seq= %08x\n",
1163                                                 __func__, ch->pdu_seq);
1164                                 ctcm_pr_debug("%s: skb:%0lx "
1165                                         "skb len: %d \n", __func__,
1166                                         (unsigned long)skb, skb->len);
1167                                 ctcm_pr_debug("%s: up to 32 bytes "
1168                                         "of pdu_data sent\n", __func__);
1169                                 ctcmpc_dump32((char *)skb->data, skb->len);
1170                         }
1171
1172                         skblen = skb->len;
1173                         sendrc = netif_rx(skb);
1174                         priv->stats.rx_packets++;
1175                         priv->stats.rx_bytes += skblen;
1176                         skb_pull(pskb, new_len); /* point to next PDU */
1177                 }
1178         } else {
1179                 mpcginfo = kmalloc(sizeof(struct mpcg_info), gfp_type());
1180                 if (mpcginfo == NULL)
1181                                         goto done;
1182
1183                 mpcginfo->ch = ch;
1184                 mpcginfo->th = header;
1185                 mpcginfo->skb = pskb;
1186                 CTCM_PR_DEBUG("%s: Not PDU - may be control pkt\n",
1187                                         __func__);
1188                 /*  it's a sweep?   */
1189                 sweep = (struct th_sweep *)pskb->data;
1190                 mpcginfo->sweep = sweep;
1191                 if (header->th_ch_flag == TH_SWEEP_REQ)
1192                         mpc_rcvd_sweep_req(mpcginfo);
1193                 else if (header->th_ch_flag == TH_SWEEP_RESP)
1194                         mpc_rcvd_sweep_resp(mpcginfo);
1195                 else if (header->th_blk_flag == TH_DATA_IS_XID) {
1196                         struct xid2 *thisxid = (struct xid2 *)pskb->data;
1197                         skb_pull(pskb, XID2_LENGTH);
1198                         mpcginfo->xid = thisxid;
1199                         fsm_event(grp->fsm, MPCG_EVENT_XID2, mpcginfo);
1200                 } else if (header->th_blk_flag == TH_DISCONTACT)
1201                         fsm_event(grp->fsm, MPCG_EVENT_DISCONC, mpcginfo);
1202                 else if (header->th_seq_num != 0) {
1203                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1204                                 "%s(%s): control pkt expected\n",
1205                                                 CTCM_FUNTAIL, dev->name);
1206                         priv->stats.rx_dropped++;
1207                         /* mpcginfo only used for non-data transfers */
1208                         kfree(mpcginfo);
1209                         if (do_debug_data)
1210                                 ctcmpc_dump_skb(pskb, -8);
1211                 }
1212         }
1213 done:
1214
1215         dev_kfree_skb_any(pskb);
1216         if (sendrc == NET_RX_DROP) {
1217                 dev_warn(&dev->dev,
1218                         "The network backlog for %s is exceeded, "
1219                         "package dropped\n", __func__);
1220                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1221         }
1222
1223         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1224                         __func__, dev->name, ch, ch->id);
1225 }
1226
1227 /**
1228  * tasklet helper for mpc's skb unpacking.
1229  *
1230  * ch           The channel to work on.
1231  * Allow flow control back pressure to occur here.
1232  * Throttling back channel can result in excessive
1233  * channel inactivity and system deact of channel
1234  */
1235 void ctcmpc_bh(unsigned long thischan)
1236 {
1237         struct channel    *ch   = (struct channel *)thischan;
1238         struct sk_buff    *skb;
1239         struct net_device *dev  = ch->netdev;
1240         struct ctcm_priv  *priv = dev->ml_priv;
1241         struct mpc_group  *grp  = priv->mpcg;
1242
1243         CTCM_PR_DEBUG("%s cp:%i enter:  %s() %s\n",
1244                dev->name, smp_processor_id(), __func__, ch->id);
1245         /* caller has requested driver to throttle back */
1246         while ((fsm_getstate(grp->fsm) != MPCG_STATE_FLOWC) &&
1247                         (skb = skb_dequeue(&ch->io_queue))) {
1248                 ctcmpc_unpack_skb(ch, skb);
1249                 if (grp->out_of_sequence > 20) {
1250                         /* assume data loss has occurred if */
1251                         /* missing seq_num for extended     */
1252                         /* period of time                   */
1253                         grp->out_of_sequence = 0;
1254                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1255                         break;
1256                 }
1257                 if (skb == skb_peek(&ch->io_queue))
1258                         break;
1259         }
1260         CTCM_PR_DEBUG("exit %s: %s: ch=0x%p id=%s\n",
1261                         __func__, dev->name, ch, ch->id);
1262         return;
1263 }
1264
1265 /*
1266  *  MPC Group Initializations
1267  */
1268 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv)
1269 {
1270         struct mpc_group *grp;
1271
1272         CTCM_DBF_TEXT_(MPC_SETUP, CTC_DBF_INFO,
1273                         "Enter %s(%p)", CTCM_FUNTAIL, priv);
1274
1275         grp = kzalloc(sizeof(struct mpc_group), GFP_KERNEL);
1276         if (grp == NULL)
1277                 return NULL;
1278
1279         grp->fsm = init_fsm("mpcg", mpcg_state_names, mpcg_event_names,
1280                         MPCG_NR_STATES, MPCG_NR_EVENTS, mpcg_fsm,
1281                         mpcg_fsm_len, GFP_KERNEL);
1282         if (grp->fsm == NULL) {
1283                 kfree(grp);
1284                 return NULL;
1285         }
1286
1287         fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1288         fsm_settimer(grp->fsm, &grp->timer);
1289
1290         grp->xid_skb =
1291                  __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC | GFP_DMA);
1292         if (grp->xid_skb == NULL) {
1293                 kfree_fsm(grp->fsm);
1294                 kfree(grp);
1295                 return NULL;
1296         }
1297         /*  base xid for all channels in group  */
1298         grp->xid_skb_data = grp->xid_skb->data;
1299         grp->xid_th = (struct th_header *)grp->xid_skb->data;
1300         skb_put_data(grp->xid_skb, &thnorm, TH_HEADER_LENGTH);
1301
1302         grp->xid = (struct xid2 *)skb_tail_pointer(grp->xid_skb);
1303         skb_put_data(grp->xid_skb, &init_xid, XID2_LENGTH);
1304         grp->xid->xid2_adj_id = jiffies | 0xfff00000;
1305         grp->xid->xid2_sender_id = jiffies;
1306
1307         grp->xid_id = skb_tail_pointer(grp->xid_skb);
1308         skb_put_data(grp->xid_skb, "VTAM", 4);
1309
1310         grp->rcvd_xid_skb =
1311                 __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
1312         if (grp->rcvd_xid_skb == NULL) {
1313                 kfree_fsm(grp->fsm);
1314                 dev_kfree_skb(grp->xid_skb);
1315                 kfree(grp);
1316                 return NULL;
1317         }
1318         grp->rcvd_xid_data = grp->rcvd_xid_skb->data;
1319         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1320         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1321         grp->saved_xid2 = NULL;
1322         priv->xid = grp->xid;
1323         priv->mpcg = grp;
1324         return grp;
1325 }
1326
1327 /*
1328  * The MPC Group Station FSM
1329  */
1330
1331 /*
1332  * MPC Group Station FSM actions
1333  * CTCM_PROTO_MPC only
1334  */
1335
1336 /**
1337  * NOP action for statemachines
1338  */
1339 static void mpc_action_nop(fsm_instance *fi, int event, void *arg)
1340 {
1341 }
1342
1343 /*
1344  * invoked when the device transitions to dev_stopped
1345  * MPC will stop each individual channel if a single XID failure
1346  * occurs, or will intitiate all channels be stopped if a GROUP
1347  * level failure occurs.
1348  */
1349 static void mpc_action_go_inop(fsm_instance *fi, int event, void *arg)
1350 {
1351         struct net_device  *dev = arg;
1352         struct ctcm_priv    *priv;
1353         struct mpc_group *grp;
1354         struct channel *wch;
1355
1356         CTCM_PR_DEBUG("Enter %s: %s\n", __func__, dev->name);
1357
1358         priv  = dev->ml_priv;
1359         grp =  priv->mpcg;
1360         grp->flow_off_called = 0;
1361         fsm_deltimer(&grp->timer);
1362         if (grp->channels_terminating)
1363                         return;
1364
1365         grp->channels_terminating = 1;
1366         grp->saved_state = fsm_getstate(grp->fsm);
1367         fsm_newstate(grp->fsm, MPCG_STATE_INOP);
1368         if (grp->saved_state > MPCG_STATE_XID7INITF)
1369                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1370                         "%s(%s): MPC GROUP INOPERATIVE",
1371                                 CTCM_FUNTAIL, dev->name);
1372         if ((grp->saved_state != MPCG_STATE_RESET) ||
1373                 /* dealloc_channel has been called */
1374                 (grp->port_persist == 0))
1375                 fsm_deltimer(&priv->restart_timer);
1376
1377         wch = priv->channel[CTCM_WRITE];
1378
1379         switch (grp->saved_state) {
1380         case MPCG_STATE_RESET:
1381         case MPCG_STATE_INOP:
1382         case MPCG_STATE_XID2INITW:
1383         case MPCG_STATE_XID0IOWAIT:
1384         case MPCG_STATE_XID2INITX:
1385         case MPCG_STATE_XID7INITW:
1386         case MPCG_STATE_XID7INITX:
1387         case MPCG_STATE_XID0IOWAIX:
1388         case MPCG_STATE_XID7INITI:
1389         case MPCG_STATE_XID7INITZ:
1390         case MPCG_STATE_XID7INITF:
1391                 break;
1392         case MPCG_STATE_FLOWC:
1393         case MPCG_STATE_READY:
1394         default:
1395                 tasklet_hi_schedule(&wch->ch_disc_tasklet);
1396         }
1397
1398         grp->xid2_tgnum = 0;
1399         grp->group_max_buflen = 0;  /*min of all received */
1400         grp->outstanding_xid2 = 0;
1401         grp->outstanding_xid7 = 0;
1402         grp->outstanding_xid7_p2 = 0;
1403         grp->saved_xid2 = NULL;
1404         grp->xidnogood = 0;
1405         grp->changed_side = 0;
1406
1407         grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1408         skb_reset_tail_pointer(grp->rcvd_xid_skb);
1409         grp->rcvd_xid_skb->len = 0;
1410         grp->rcvd_xid_th = (struct th_header *)grp->rcvd_xid_skb->data;
1411         skb_put_data(grp->rcvd_xid_skb, &thnorm, TH_HEADER_LENGTH);
1412
1413         if (grp->send_qllc_disc == 1) {
1414                 grp->send_qllc_disc = 0;
1415                 mpc_send_qllc_discontact(dev);
1416         }
1417
1418         /* DO NOT issue DEV_EVENT_STOP directly out of this code */
1419         /* This can result in INOP of VTAM PU due to halting of  */
1420         /* outstanding IO which causes a sense to be returned    */
1421         /* Only about 3 senses are allowed and then IOS/VTAM will*/
1422         /* become unreachable without manual intervention        */
1423         if ((grp->port_persist == 1) || (grp->alloc_called)) {
1424                 grp->alloc_called = 0;
1425                 fsm_deltimer(&priv->restart_timer);
1426                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_RESTART, dev);
1427                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1428                 if (grp->saved_state > MPCG_STATE_XID7INITF)
1429                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1430                                 "%s(%s): MPC GROUP RECOVERY SCHEDULED",
1431                                         CTCM_FUNTAIL, dev->name);
1432         } else {
1433                 fsm_deltimer(&priv->restart_timer);
1434                 fsm_addtimer(&priv->restart_timer, 500, DEV_EVENT_STOP, dev);
1435                 fsm_newstate(grp->fsm, MPCG_STATE_RESET);
1436                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ALWAYS,
1437                         "%s(%s): NO MPC GROUP RECOVERY ATTEMPTED",
1438                                                 CTCM_FUNTAIL, dev->name);
1439         }
1440 }
1441
1442 /**
1443  * Handle mpc group  action timeout.
1444  * MPC Group Station FSM action
1445  * CTCM_PROTO_MPC only
1446  *
1447  * fi           An instance of an mpc_group fsm.
1448  * event        The event, just happened.
1449  * arg          Generic pointer, casted from net_device * upon call.
1450  */
1451 static void mpc_action_timeout(fsm_instance *fi, int event, void *arg)
1452 {
1453         struct net_device *dev = arg;
1454         struct ctcm_priv *priv;
1455         struct mpc_group *grp;
1456         struct channel *wch;
1457         struct channel *rch;
1458
1459         priv = dev->ml_priv;
1460         grp = priv->mpcg;
1461         wch = priv->channel[CTCM_WRITE];
1462         rch = priv->channel[CTCM_READ];
1463
1464         switch (fsm_getstate(grp->fsm)) {
1465         case MPCG_STATE_XID2INITW:
1466                 /* Unless there is outstanding IO on the  */
1467                 /* channel just return and wait for ATTN  */
1468                 /* interrupt to begin XID negotiations    */
1469                 if ((fsm_getstate(rch->fsm) == CH_XID0_PENDING) &&
1470                    (fsm_getstate(wch->fsm) == CH_XID0_PENDING))
1471                         break;
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],
1525                                         (unsigned long)ch, 0xff, 0);
1526         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1527
1528         if (rc != 0) {
1529                 ctcm_ccw_check_rc(ch, rc, (char *)__func__);
1530         }
1531
1532         return;
1533 }
1534
1535
1536 /*
1537  * helper function of mpc FSM
1538  * CTCM_PROTO_MPC only
1539  * mpc_action_rcvd_xid7
1540 */
1541 static int mpc_validate_xid(struct mpcg_info *mpcginfo)
1542 {
1543         struct channel     *ch   = mpcginfo->ch;
1544         struct net_device  *dev  = ch->netdev;
1545         struct ctcm_priv   *priv = dev->ml_priv;
1546         struct mpc_group   *grp  = priv->mpcg;
1547         struct xid2        *xid  = mpcginfo->xid;
1548         int     rc       = 0;
1549         __u64   our_id   = 0;
1550         __u64   their_id = 0;
1551         int     len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1552
1553         CTCM_PR_DEBUG("Enter %s: xid=%p\n", __func__, xid);
1554
1555         if (xid == NULL) {
1556                 rc = 1;
1557                 /* XID REJECTED: xid == NULL */
1558                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1559                         "%s(%s): xid = NULL",
1560                                 CTCM_FUNTAIL, ch->id);
1561                         goto done;
1562         }
1563
1564         CTCM_D3_DUMP((char *)xid, XID2_LENGTH);
1565
1566         /*the received direction should be the opposite of ours  */
1567         if (((CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ? XID2_WRITE_SIDE :
1568                                 XID2_READ_SIDE) != xid->xid2_dlc_type) {
1569                 rc = 2;
1570                 /* XID REJECTED: r/w channel pairing mismatch */
1571                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1572                         "%s(%s): r/w channel pairing mismatch",
1573                                 CTCM_FUNTAIL, ch->id);
1574                         goto done;
1575         }
1576
1577         if (xid->xid2_dlc_type == XID2_READ_SIDE) {
1578                 CTCM_PR_DEBUG("%s: grpmaxbuf:%d xid2buflen:%d\n", __func__,
1579                                 grp->group_max_buflen, xid->xid2_buf_len);
1580
1581                 if (grp->group_max_buflen == 0 || grp->group_max_buflen >
1582                                                 xid->xid2_buf_len - len)
1583                         grp->group_max_buflen = xid->xid2_buf_len - len;
1584         }
1585
1586         if (grp->saved_xid2 == NULL) {
1587                 grp->saved_xid2 =
1588                         (struct xid2 *)skb_tail_pointer(grp->rcvd_xid_skb);
1589
1590                 skb_put_data(grp->rcvd_xid_skb, xid, XID2_LENGTH);
1591                 grp->rcvd_xid_skb->data = grp->rcvd_xid_data;
1592
1593                 skb_reset_tail_pointer(grp->rcvd_xid_skb);
1594                 grp->rcvd_xid_skb->len = 0;
1595
1596                 /* convert two 32 bit numbers into 1 64 bit for id compare */
1597                 our_id = (__u64)priv->xid->xid2_adj_id;
1598                 our_id = our_id << 32;
1599                 our_id = our_id + priv->xid->xid2_sender_id;
1600                 their_id = (__u64)xid->xid2_adj_id;
1601                 their_id = their_id << 32;
1602                 their_id = their_id + xid->xid2_sender_id;
1603                 /* lower id assume the xside role */
1604                 if (our_id < their_id) {
1605                         grp->roll = XSIDE;
1606                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1607                                 "%s(%s): WE HAVE LOW ID - TAKE XSIDE",
1608                                         CTCM_FUNTAIL, ch->id);
1609                 } else {
1610                         grp->roll = YSIDE;
1611                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_NOTICE,
1612                                 "%s(%s): WE HAVE HIGH ID - TAKE YSIDE",
1613                                         CTCM_FUNTAIL, ch->id);
1614                 }
1615
1616         } else {
1617                 if (xid->xid2_flag4 != grp->saved_xid2->xid2_flag4) {
1618                         rc = 3;
1619                         /* XID REJECTED: xid flag byte4 mismatch */
1620                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1621                                 "%s(%s): xid flag byte4 mismatch",
1622                                         CTCM_FUNTAIL, ch->id);
1623                 }
1624                 if (xid->xid2_flag2 == 0x40) {
1625                         rc = 4;
1626                         /* XID REJECTED - xid NOGOOD */
1627                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1628                                 "%s(%s): xid NOGOOD",
1629                                         CTCM_FUNTAIL, ch->id);
1630                 }
1631                 if (xid->xid2_adj_id != grp->saved_xid2->xid2_adj_id) {
1632                         rc = 5;
1633                         /* XID REJECTED - Adjacent Station ID Mismatch */
1634                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1635                                 "%s(%s): Adjacent Station ID Mismatch",
1636                                         CTCM_FUNTAIL, ch->id);
1637                 }
1638                 if (xid->xid2_sender_id != grp->saved_xid2->xid2_sender_id) {
1639                         rc = 6;
1640                         /* XID REJECTED - Sender Address Mismatch */
1641                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1642                                 "%s(%s): Sender Address Mismatch",
1643                                         CTCM_FUNTAIL, ch->id);
1644                 }
1645         }
1646 done:
1647         if (rc) {
1648                 dev_warn(&dev->dev,
1649                         "The XID used in the MPC protocol is not valid, "
1650                         "rc = %d\n", rc);
1651                 priv->xid->xid2_flag2 = 0x40;
1652                 grp->saved_xid2->xid2_flag2 = 0x40;
1653         }
1654
1655         return rc;
1656 }
1657
1658 /*
1659  * MPC Group Station FSM action
1660  * CTCM_PROTO_MPC only
1661  */
1662 static void mpc_action_side_xid(fsm_instance *fsm, void *arg, int side)
1663 {
1664         struct channel *ch = arg;
1665         int rc = 0;
1666         int gotlock = 0;
1667         unsigned long saveflags = 0;    /* avoids compiler warning with
1668                                            spin_unlock_irqrestore */
1669
1670         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1671                         __func__, smp_processor_id(), ch, ch->id);
1672
1673         if (ctcm_checkalloc_buffer(ch))
1674                                         goto done;
1675
1676         /*
1677          * skb data-buffer referencing:
1678          */
1679         ch->trans_skb->data = ch->trans_skb_data;
1680         skb_reset_tail_pointer(ch->trans_skb);
1681         ch->trans_skb->len = 0;
1682         /* result of the previous 3 statements is NOT always
1683          * already set after ctcm_checkalloc_buffer
1684          * because of possible reuse of the trans_skb
1685          */
1686         memset(ch->trans_skb->data, 0, 16);
1687         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1688         /* check is main purpose here: */
1689         skb_put(ch->trans_skb, TH_HEADER_LENGTH);
1690         ch->rcvd_xid = (struct xid2 *)skb_tail_pointer(ch->trans_skb);
1691         /* check is main purpose here: */
1692         skb_put(ch->trans_skb, XID2_LENGTH);
1693         ch->rcvd_xid_id = skb_tail_pointer(ch->trans_skb);
1694         /* cleanup back to startpoint */
1695         ch->trans_skb->data = ch->trans_skb_data;
1696         skb_reset_tail_pointer(ch->trans_skb);
1697         ch->trans_skb->len = 0;
1698
1699         /* non-checking rewrite of above skb data-buffer referencing: */
1700         /*
1701         memset(ch->trans_skb->data, 0, 16);
1702         ch->rcvd_xid_th =  (struct th_header *)ch->trans_skb_data;
1703         ch->rcvd_xid = (struct xid2 *)(ch->trans_skb_data + TH_HEADER_LENGTH);
1704         ch->rcvd_xid_id = ch->trans_skb_data + TH_HEADER_LENGTH + XID2_LENGTH;
1705          */
1706
1707         ch->ccw[8].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1708         ch->ccw[8].count        = 0;
1709         ch->ccw[8].cda          = 0x00;
1710
1711         if (!(ch->xid_th && ch->xid && ch->xid_id))
1712                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_INFO,
1713                         "%s(%s): xid_th=%p, xid=%p, xid_id=%p",
1714                         CTCM_FUNTAIL, ch->id, ch->xid_th, ch->xid, ch->xid_id);
1715
1716         if (side == XSIDE) {
1717                 /* mpc_action_xside_xid */
1718                 if (ch->xid_th == NULL)
1719                                 goto done;
1720                 ch->ccw[9].cmd_code     = CCW_CMD_WRITE;
1721                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1722                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1723                 ch->ccw[9].cda          = virt_to_phys(ch->xid_th);
1724
1725                 if (ch->xid == NULL)
1726                                 goto done;
1727                 ch->ccw[10].cmd_code    = CCW_CMD_WRITE;
1728                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1729                 ch->ccw[10].count       = XID2_LENGTH;
1730                 ch->ccw[10].cda         = virt_to_phys(ch->xid);
1731
1732                 ch->ccw[11].cmd_code    = CCW_CMD_READ;
1733                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1734                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1735                 ch->ccw[11].cda         = virt_to_phys(ch->rcvd_xid_th);
1736
1737                 ch->ccw[12].cmd_code    = CCW_CMD_READ;
1738                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1739                 ch->ccw[12].count       = XID2_LENGTH;
1740                 ch->ccw[12].cda         = virt_to_phys(ch->rcvd_xid);
1741
1742                 ch->ccw[13].cmd_code    = CCW_CMD_READ;
1743                 ch->ccw[13].cda         = virt_to_phys(ch->rcvd_xid_id);
1744
1745         } else { /* side == YSIDE : mpc_action_yside_xid */
1746                 ch->ccw[9].cmd_code     = CCW_CMD_READ;
1747                 ch->ccw[9].flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1748                 ch->ccw[9].count        = TH_HEADER_LENGTH;
1749                 ch->ccw[9].cda          = virt_to_phys(ch->rcvd_xid_th);
1750
1751                 ch->ccw[10].cmd_code    = CCW_CMD_READ;
1752                 ch->ccw[10].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1753                 ch->ccw[10].count       = XID2_LENGTH;
1754                 ch->ccw[10].cda         = virt_to_phys(ch->rcvd_xid);
1755
1756                 if (ch->xid_th == NULL)
1757                                 goto done;
1758                 ch->ccw[11].cmd_code    = CCW_CMD_WRITE;
1759                 ch->ccw[11].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1760                 ch->ccw[11].count       = TH_HEADER_LENGTH;
1761                 ch->ccw[11].cda         = virt_to_phys(ch->xid_th);
1762
1763                 if (ch->xid == NULL)
1764                                 goto done;
1765                 ch->ccw[12].cmd_code    = CCW_CMD_WRITE;
1766                 ch->ccw[12].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1767                 ch->ccw[12].count       = XID2_LENGTH;
1768                 ch->ccw[12].cda         = virt_to_phys(ch->xid);
1769
1770                 if (ch->xid_id == NULL)
1771                                 goto done;
1772                 ch->ccw[13].cmd_code    = CCW_CMD_WRITE;
1773                 ch->ccw[13].cda         = virt_to_phys(ch->xid_id);
1774
1775         }
1776         ch->ccw[13].flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1777         ch->ccw[13].count       = 4;
1778
1779         ch->ccw[14].cmd_code    = CCW_CMD_NOOP;
1780         ch->ccw[14].flags       = CCW_FLAG_SLI;
1781         ch->ccw[14].count       = 0;
1782         ch->ccw[14].cda         = 0;
1783
1784         CTCM_CCW_DUMP((char *)&ch->ccw[8], sizeof(struct ccw1) * 7);
1785         CTCM_D3_DUMP((char *)ch->xid_th, TH_HEADER_LENGTH);
1786         CTCM_D3_DUMP((char *)ch->xid, XID2_LENGTH);
1787         CTCM_D3_DUMP((char *)ch->xid_id, 4);
1788
1789         if (!in_irq()) {
1790                          /* Such conditional locking is a known problem for
1791                           * sparse because its static undeterministic.
1792                           * Warnings should be ignored here. */
1793                 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
1794                 gotlock = 1;
1795         }
1796
1797         fsm_addtimer(&ch->timer, 5000 , CTC_EVENT_TIMER, ch);
1798         rc = ccw_device_start(ch->cdev, &ch->ccw[8],
1799                                 (unsigned long)ch, 0xff, 0);
1800
1801         if (gotlock)    /* see remark above about conditional locking */
1802                 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
1803
1804         if (rc != 0) {
1805                 ctcm_ccw_check_rc(ch, rc,
1806                                 (side == XSIDE) ? "x-side XID" : "y-side XID");
1807         }
1808
1809 done:
1810         CTCM_PR_DEBUG("Exit %s: ch=0x%p id=%s\n",
1811                                 __func__, ch, ch->id);
1812         return;
1813
1814 }
1815
1816 /*
1817  * MPC Group Station FSM action
1818  * CTCM_PROTO_MPC only
1819  */
1820 static void mpc_action_xside_xid(fsm_instance *fsm, int event, void *arg)
1821 {
1822         mpc_action_side_xid(fsm, arg, XSIDE);
1823 }
1824
1825 /*
1826  * MPC Group Station FSM action
1827  * CTCM_PROTO_MPC only
1828  */
1829 static void mpc_action_yside_xid(fsm_instance *fsm, int event, void *arg)
1830 {
1831         mpc_action_side_xid(fsm, arg, YSIDE);
1832 }
1833
1834 /*
1835  * MPC Group Station FSM action
1836  * CTCM_PROTO_MPC only
1837  */
1838 static void mpc_action_doxid0(fsm_instance *fsm, int event, void *arg)
1839 {
1840         struct channel     *ch   = arg;
1841         struct net_device  *dev  = ch->netdev;
1842         struct ctcm_priv   *priv = dev->ml_priv;
1843         struct mpc_group   *grp  = priv->mpcg;
1844
1845         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
1846                         __func__, smp_processor_id(), ch, ch->id);
1847
1848         if (ch->xid == NULL) {
1849                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1850                         "%s(%s): ch->xid == NULL",
1851                                 CTCM_FUNTAIL, dev->name);
1852                 return;
1853         }
1854
1855         fsm_newstate(ch->fsm, CH_XID0_INPROGRESS);
1856
1857         ch->xid->xid2_option =  XID2_0;
1858
1859         switch (fsm_getstate(grp->fsm)) {
1860         case MPCG_STATE_XID2INITW:
1861         case MPCG_STATE_XID2INITX:
1862                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1863                 break;
1864         case MPCG_STATE_XID0IOWAIT:
1865         case MPCG_STATE_XID0IOWAIX:
1866                 ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1867                 break;
1868         }
1869
1870         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1871
1872         return;
1873 }
1874
1875 /*
1876  * MPC Group Station FSM action
1877  * CTCM_PROTO_MPC only
1878 */
1879 static void mpc_action_doxid7(fsm_instance *fsm, int event, void *arg)
1880 {
1881         struct net_device *dev = arg;
1882         struct ctcm_priv  *priv = dev->ml_priv;
1883         struct mpc_group  *grp  = NULL;
1884         int direction;
1885         int send = 0;
1886
1887         if (priv)
1888                 grp = priv->mpcg;
1889         if (grp == NULL)
1890                 return;
1891
1892         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1893                 struct channel *ch = priv->channel[direction];
1894                 struct xid2 *thisxid = ch->xid;
1895                 ch->xid_skb->data = ch->xid_skb_data;
1896                 skb_reset_tail_pointer(ch->xid_skb);
1897                 ch->xid_skb->len = 0;
1898                 thisxid->xid2_option = XID2_7;
1899                 send = 0;
1900
1901                 /* xid7 phase 1 */
1902                 if (grp->outstanding_xid7_p2 > 0) {
1903                         if (grp->roll == YSIDE) {
1904                                 if (fsm_getstate(ch->fsm) == CH_XID7_PENDING1) {
1905                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1906                                         ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1907                                         skb_put_data(ch->xid_skb, &thdummy,
1908                                                      TH_HEADER_LENGTH);
1909                                         send = 1;
1910                                 }
1911                         } else if (fsm_getstate(ch->fsm) < CH_XID7_PENDING2) {
1912                                         fsm_newstate(ch->fsm, CH_XID7_PENDING2);
1913                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1914                                         skb_put_data(ch->xid_skb, &thnorm,
1915                                                      TH_HEADER_LENGTH);
1916                                         send = 1;
1917                         }
1918                 } else {
1919                         /* xid7 phase 2 */
1920                         if (grp->roll == YSIDE) {
1921                                 if (fsm_getstate(ch->fsm) < CH_XID7_PENDING4) {
1922                                         fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1923                                         skb_put_data(ch->xid_skb, &thnorm,
1924                                                      TH_HEADER_LENGTH);
1925                                         ch->ccw[8].cmd_code = CCW_CMD_WRITE_CTL;
1926                                         send = 1;
1927                                 }
1928                         } else if (fsm_getstate(ch->fsm) == CH_XID7_PENDING3) {
1929                                 fsm_newstate(ch->fsm, CH_XID7_PENDING4);
1930                                 ch->ccw[8].cmd_code = CCW_CMD_SENSE_CMD;
1931                                 skb_put_data(ch->xid_skb, &thdummy,
1932                                              TH_HEADER_LENGTH);
1933                                 send = 1;
1934                         }
1935                 }
1936
1937                 if (send)
1938                         fsm_event(grp->fsm, MPCG_EVENT_DOIO, ch);
1939         }
1940
1941         return;
1942 }
1943
1944 /*
1945  * MPC Group Station FSM action
1946  * CTCM_PROTO_MPC only
1947  */
1948 static void mpc_action_rcvd_xid0(fsm_instance *fsm, int event, void *arg)
1949 {
1950
1951         struct mpcg_info   *mpcginfo  = arg;
1952         struct channel     *ch   = mpcginfo->ch;
1953         struct net_device  *dev  = ch->netdev;
1954         struct ctcm_priv   *priv = dev->ml_priv;
1955         struct mpc_group   *grp  = priv->mpcg;
1956
1957         CTCM_PR_DEBUG("%s: ch-id:%s xid2:%i xid7:%i xidt_p2:%i \n",
1958                         __func__, ch->id, grp->outstanding_xid2,
1959                         grp->outstanding_xid7, grp->outstanding_xid7_p2);
1960
1961         if (fsm_getstate(ch->fsm) < CH_XID7_PENDING)
1962                 fsm_newstate(ch->fsm, CH_XID7_PENDING);
1963
1964         grp->outstanding_xid2--;
1965         grp->outstanding_xid7++;
1966         grp->outstanding_xid7_p2++;
1967
1968         /* must change state before validating xid to */
1969         /* properly handle interim interrupts received*/
1970         switch (fsm_getstate(grp->fsm)) {
1971         case MPCG_STATE_XID2INITW:
1972                 fsm_newstate(grp->fsm, MPCG_STATE_XID2INITX);
1973                 mpc_validate_xid(mpcginfo);
1974                 break;
1975         case MPCG_STATE_XID0IOWAIT:
1976                 fsm_newstate(grp->fsm, MPCG_STATE_XID0IOWAIX);
1977                 mpc_validate_xid(mpcginfo);
1978                 break;
1979         case MPCG_STATE_XID2INITX:
1980                 if (grp->outstanding_xid2 == 0) {
1981                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITW);
1982                         mpc_validate_xid(mpcginfo);
1983                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1984                 }
1985                 break;
1986         case MPCG_STATE_XID0IOWAIX:
1987                 if (grp->outstanding_xid2 == 0) {
1988                         fsm_newstate(grp->fsm, MPCG_STATE_XID7INITI);
1989                         mpc_validate_xid(mpcginfo);
1990                         fsm_event(grp->fsm, MPCG_EVENT_XID2DONE, dev);
1991                 }
1992                 break;
1993         }
1994         kfree(mpcginfo);
1995
1996         CTCM_PR_DEBUG("ctcmpc:%s() %s xid2:%i xid7:%i xidt_p2:%i \n",
1997                 __func__, ch->id, grp->outstanding_xid2,
1998                 grp->outstanding_xid7, grp->outstanding_xid7_p2);
1999         CTCM_PR_DEBUG("ctcmpc:%s() %s grpstate: %s chanstate: %s \n",
2000                 __func__, ch->id,
2001                 fsm_getstate_str(grp->fsm), fsm_getstate_str(ch->fsm));
2002         return;
2003
2004 }
2005
2006
2007 /*
2008  * MPC Group Station FSM action
2009  * CTCM_PROTO_MPC only
2010  */
2011 static void mpc_action_rcvd_xid7(fsm_instance *fsm, int event, void *arg)
2012 {
2013         struct mpcg_info   *mpcginfo   = arg;
2014         struct channel     *ch         = mpcginfo->ch;
2015         struct net_device  *dev        = ch->netdev;
2016         struct ctcm_priv   *priv    = dev->ml_priv;
2017         struct mpc_group   *grp     = priv->mpcg;
2018
2019         CTCM_PR_DEBUG("Enter %s: cp=%i ch=0x%p id=%s\n",
2020                 __func__, smp_processor_id(), ch, ch->id);
2021         CTCM_PR_DEBUG("%s: outstanding_xid7: %i, outstanding_xid7_p2: %i\n",
2022                 __func__, grp->outstanding_xid7, grp->outstanding_xid7_p2);
2023
2024         grp->outstanding_xid7--;
2025         ch->xid_skb->data = ch->xid_skb_data;
2026         skb_reset_tail_pointer(ch->xid_skb);
2027         ch->xid_skb->len = 0;
2028
2029         switch (fsm_getstate(grp->fsm)) {
2030         case MPCG_STATE_XID7INITI:
2031                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITZ);
2032                 mpc_validate_xid(mpcginfo);
2033                 break;
2034         case MPCG_STATE_XID7INITW:
2035                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITX);
2036                 mpc_validate_xid(mpcginfo);
2037                 break;
2038         case MPCG_STATE_XID7INITZ:
2039         case MPCG_STATE_XID7INITX:
2040                 if (grp->outstanding_xid7 == 0) {
2041                         if (grp->outstanding_xid7_p2 > 0) {
2042                                 grp->outstanding_xid7 =
2043                                         grp->outstanding_xid7_p2;
2044                                 grp->outstanding_xid7_p2 = 0;
2045                         } else
2046                                 fsm_newstate(grp->fsm, MPCG_STATE_XID7INITF);
2047
2048                         mpc_validate_xid(mpcginfo);
2049                         fsm_event(grp->fsm, MPCG_EVENT_XID7DONE, dev);
2050                         break;
2051                 }
2052                 mpc_validate_xid(mpcginfo);
2053                 break;
2054         }
2055         kfree(mpcginfo);
2056         return;
2057 }
2058
2059 /*
2060  * mpc_action helper of an MPC Group Station FSM action
2061  * CTCM_PROTO_MPC only
2062  */
2063 static int mpc_send_qllc_discontact(struct net_device *dev)
2064 {
2065         __u32   new_len = 0;
2066         struct sk_buff   *skb;
2067         struct qllc      *qllcptr;
2068         struct ctcm_priv *priv = dev->ml_priv;
2069         struct mpc_group *grp = priv->mpcg;
2070
2071         CTCM_PR_DEBUG("%s: GROUP STATE: %s\n",
2072                 __func__, mpcg_state_names[grp->saved_state]);
2073
2074         switch (grp->saved_state) {
2075         /*
2076          * establish conn callback function is
2077          * preferred method to report failure
2078          */
2079         case MPCG_STATE_XID0IOWAIT:
2080         case MPCG_STATE_XID0IOWAIX:
2081         case MPCG_STATE_XID7INITI:
2082         case MPCG_STATE_XID7INITZ:
2083         case MPCG_STATE_XID2INITW:
2084         case MPCG_STATE_XID2INITX:
2085         case MPCG_STATE_XID7INITW:
2086         case MPCG_STATE_XID7INITX:
2087                 if (grp->estconnfunc) {
2088                         grp->estconnfunc(grp->port_num, -1, 0);
2089                         grp->estconnfunc = NULL;
2090                         break;
2091                 }
2092         case MPCG_STATE_FLOWC:
2093         case MPCG_STATE_READY:
2094                 grp->send_qllc_disc = 2;
2095                 new_len = sizeof(struct qllc);
2096                 qllcptr = kzalloc(new_len, gfp_type() | GFP_DMA);
2097                 if (qllcptr == NULL) {
2098                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2099                                 "%s(%s): qllcptr allocation error",
2100                                                 CTCM_FUNTAIL, dev->name);
2101                         return -ENOMEM;
2102                 }
2103
2104                 qllcptr->qllc_address = 0xcc;
2105                 qllcptr->qllc_commands = 0x03;
2106
2107                 skb = __dev_alloc_skb(new_len, GFP_ATOMIC);
2108
2109                 if (skb == NULL) {
2110                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2111                                 "%s(%s): skb allocation error",
2112                                                 CTCM_FUNTAIL, dev->name);
2113                         priv->stats.rx_dropped++;
2114                         kfree(qllcptr);
2115                         return -ENOMEM;
2116                 }
2117
2118                 skb_put_data(skb, qllcptr, new_len);
2119                 kfree(qllcptr);
2120
2121                 if (skb_headroom(skb) < 4) {
2122                         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
2123                                 "%s(%s): skb_headroom error",
2124                                                 CTCM_FUNTAIL, dev->name);
2125                         dev_kfree_skb_any(skb);
2126                         return -ENOMEM;
2127                 }
2128
2129                 *((__u32 *)skb_push(skb, 4)) =
2130                         priv->channel[CTCM_READ]->pdu_seq;
2131                 priv->channel[CTCM_READ]->pdu_seq++;
2132                 CTCM_PR_DBGDATA("ctcmpc: %s ToDCM_pdu_seq= %08x\n",
2133                                 __func__, priv->channel[CTCM_READ]->pdu_seq);
2134
2135                 /* receipt of CC03 resets anticipated sequence number on
2136                       receiving side */
2137                 priv->channel[CTCM_READ]->pdu_seq = 0x00;
2138                 skb_reset_mac_header(skb);
2139                 skb->dev = dev;
2140                 skb->protocol = htons(ETH_P_SNAP);
2141                 skb->ip_summed = CHECKSUM_UNNECESSARY;
2142
2143                 CTCM_D3_DUMP(skb->data, (sizeof(struct qllc) + 4));
2144
2145                 netif_rx(skb);
2146                 break;
2147         default:
2148                 break;
2149
2150         }
2151
2152         return 0;
2153 }
2154 /* --- This is the END my friend --- */
2155