drivers/s390/net/ctcm_main.c

   1 /*
   2  * drivers/s390/net/ctcm_main.c
   3  *
   4  * Copyright IBM Corp. 2001, 2009
   5  * Author(s):
   6  *      Original CTC driver(s):
   7  *              Fritz Elfert (felfert@millenux.com)
   8  *              Dieter Wellerdiek (wel@de.ibm.com)
   9  *              Martin Schwidefsky (schwidefsky@de.ibm.com)
  10  *              Denis Joseph Barrow (barrow_dj@yahoo.com)
  11  *              Jochen Roehrig (roehrig@de.ibm.com)
  12  *              Cornelia Huck <cornelia.huck@de.ibm.com>
  13  *      MPC additions:
  14  *              Belinda Thompson (belindat@us.ibm.com)
  15  *              Andy Richter (richtera@us.ibm.com)
  16  *      Revived by:
  17  *              Peter Tiedemann (ptiedem@de.ibm.com)
  18  */
  19
  20 #undef DEBUG
  21 #undef DEBUGDATA
  22 #undef DEBUGCCW
  23
  24 #define KMSG_COMPONENT "ctcm"
  25 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  26
  27 #include <linux/kernel_stat.h>
  28 #include <linux/module.h>
  29 #include <linux/init.h>
  30 #include <linux/kernel.h>
  31 #include <linux/slab.h>
  32 #include <linux/errno.h>
  33 #include <linux/types.h>
  34 #include <linux/interrupt.h>
  35 #include <linux/timer.h>
  36 #include <linux/bitops.h>
  37
  38 #include <linux/signal.h>
  39 #include <linux/string.h>
  40
  41 #include <linux/ip.h>
  42 #include <linux/if_arp.h>
  43 #include <linux/tcp.h>
  44 #include <linux/skbuff.h>
  45 #include <linux/ctype.h>
  46 #include <net/dst.h>
  47
  48 #include <linux/io.h>
  49 #include <asm/ccwdev.h>
  50 #include <asm/ccwgroup.h>
  51 #include <linux/uaccess.h>
  52
  53 #include <asm/idals.h>
  54
  55 #include "ctcm_fsms.h"
  56 #include "ctcm_main.h"
  57
  58 /* Some common global variables */
  59
  60 /**
  61  * The root device for ctcm group devices
  62  */
  63 static struct device *ctcm_root_dev;
  64
  65 /*
  66  * Linked list of all detected channels.
  67  */
  68 struct channel *channels;
  69
  70 /**
  71  * Unpack a just received skb and hand it over to
  72  * upper layers.
  73  *
  74  *  ch          The channel where this skb has been received.
  75  *  pskb        The received skb.
  76  */
  77 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  78 {
  79         struct net_device *dev = ch->netdev;
  80         struct ctcm_priv *priv = dev->ml_priv;
  81         __u16 len = *((__u16 *) pskb->data);
  82
  83         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  84         skb_pull(pskb, 2);
  85         pskb->dev = dev;
  86         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  87         while (len > 0) {
  88                 struct sk_buff *skb;
  89                 int skblen;
  90                 struct ll_header *header = (struct ll_header *)pskb->data;
  91
  92                 skb_pull(pskb, LL_HEADER_LENGTH);
  93                 if ((ch->protocol == CTCM_PROTO_S390) &&
  94                     (header->type != ETH_P_IP)) {
  95                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  96                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  97                                 /*
  98                                  * Check packet type only if we stick strictly
  99                                  * to S/390's protocol of OS390. This only
 100                                  * supports IP. Otherwise allow any packet
 101                                  * type.
 102                                  */
 103                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 104                                         "%s(%s): Illegal packet type 0x%04x"
 105                                         " - dropping",
 106                                         CTCM_FUNTAIL, dev->name, header->type);
 107                         }
 108                         priv->stats.rx_dropped++;
 109                         priv->stats.rx_frame_errors++;
 110                         return;
 111                 }
 112                 pskb->protocol = ntohs(header->type);
 113                 if ((header->length <= LL_HEADER_LENGTH) ||
 114                     (len <= LL_HEADER_LENGTH)) {
 115                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 116                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 117                                         "%s(%s): Illegal packet size %d(%d,%d)"
 118                                         "- dropping",
 119                                         CTCM_FUNTAIL, dev->name,
 120                                         header->length, dev->mtu, len);
 121                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 122                         }
 123
 124                         priv->stats.rx_dropped++;
 125                         priv->stats.rx_length_errors++;
 126                         return;
 127                 }
 128                 header->length -= LL_HEADER_LENGTH;
 129                 len -= LL_HEADER_LENGTH;
 130                 if ((header->length > skb_tailroom(pskb)) ||
 131                         (header->length > len)) {
 132                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 133                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 134                                         "%s(%s): Packet size %d (overrun)"
 135                                         " - dropping", CTCM_FUNTAIL,
 136                                                 dev->name, header->length);
 137                                 ch->logflags |= LOG_FLAG_OVERRUN;
 138                         }
 139
 140                         priv->stats.rx_dropped++;
 141                         priv->stats.rx_length_errors++;
 142                         return;
 143                 }
 144                 skb_put(pskb, header->length);
 145                 skb_reset_mac_header(pskb);
 146                 len -= header->length;
 147                 skb = dev_alloc_skb(pskb->len);
 148                 if (!skb) {
 149                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 150                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 151                                         "%s(%s): MEMORY allocation error",
 152                                                 CTCM_FUNTAIL, dev->name);
 153                                 ch->logflags |= LOG_FLAG_NOMEM;
 154                         }
 155                         priv->stats.rx_dropped++;
 156                         return;
 157                 }
 158                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 159                                           pskb->len);
 160                 skb_reset_mac_header(skb);
 161                 skb->dev = pskb->dev;
 162                 skb->protocol = pskb->protocol;
 163                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 164                 skblen = skb->len;
 165                 /*
 166                  * reset logflags
 167                  */
 168                 ch->logflags = 0;
 169                 priv->stats.rx_packets++;
 170                 priv->stats.rx_bytes += skblen;
 171                 netif_rx_ni(skb);
 172                 if (len > 0) {
 173                         skb_pull(pskb, header->length);
 174                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 175                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 176                                         "Overrun in ctcm_unpack_skb");
 177                                 ch->logflags |= LOG_FLAG_OVERRUN;
 178                                 return;
 179                         }
 180                         skb_put(pskb, LL_HEADER_LENGTH);
 181                 }
 182         }
 183 }
 184
 185 /**
 186  * Release a specific channel in the channel list.
 187  *
 188  *  ch          Pointer to channel struct to be released.
 189  */
 190 static void channel_free(struct channel *ch)
 191 {
 192         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 193         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 194         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 195 }
 196
 197 /**
 198  * Remove a specific channel in the channel list.
 199  *
 200  *  ch          Pointer to channel struct to be released.
 201  */
 202 static void channel_remove(struct channel *ch)
 203 {
 204         struct channel **c = &channels;
 205         char chid[CTCM_ID_SIZE+1];
 206         int ok = 0;
 207
 208         if (ch == NULL)
 209                 return;
 210         else
 211                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 212
 213         channel_free(ch);
 214         while (*c) {
 215                 if (*c == ch) {
 216                         *c = ch->next;
 217                         fsm_deltimer(&ch->timer);
 218                         if (IS_MPC(ch))
 219                                 fsm_deltimer(&ch->sweep_timer);
 220
 221                         kfree_fsm(ch->fsm);
 222                         clear_normalized_cda(&ch->ccw[4]);
 223                         if (ch->trans_skb != NULL) {
 224                                 clear_normalized_cda(&ch->ccw[1]);
 225                                 dev_kfree_skb_any(ch->trans_skb);
 226                         }
 227                         if (IS_MPC(ch)) {
 228                                 tasklet_kill(&ch->ch_tasklet);
 229                                 tasklet_kill(&ch->ch_disc_tasklet);
 230                                 kfree(ch->discontact_th);
 231                         }
 232                         kfree(ch->ccw);
 233                         kfree(ch->irb);
 234                         kfree(ch);
 235                         ok = 1;
 236                         break;
 237                 }
 238                 c = &((*c)->next);
 239         }
 240
 241         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 242                         chid, ok ? "OK" : "failed");
 243 }
 244
 245 /**
 246  * Get a specific channel from the channel list.
 247  *
 248  *  type        Type of channel we are interested in.
 249  *  id          Id of channel we are interested in.
 250  *  direction   Direction we want to use this channel for.
 251  *
 252  * returns Pointer to a channel or NULL if no matching channel available.
 253  */
 254 static struct channel *channel_get(enum ctcm_channel_types type,
 255                                         char *id, int direction)
 256 {
 257         struct channel *ch = channels;
 258
 259         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 260                 ch = ch->next;
 261         if (!ch) {
 262                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 263                                 "%s(%d, %s, %d) not found in channel list\n",
 264                                 CTCM_FUNTAIL, type, id, direction);
 265         } else {
 266                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 267                         ch = NULL;
 268                 else {
 269                         ch->flags |= CHANNEL_FLAGS_INUSE;
 270                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 271                         ch->flags |= (direction == CTCM_WRITE)
 272                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 273                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 274                 }
 275         }
 276         return ch;
 277 }
 278
 279 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 280 {
 281         if (!IS_ERR(irb))
 282                 return 0;
 283
 284         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 285                         "irb error %ld on device %s\n",
 286                                 PTR_ERR(irb), dev_name(&cdev->dev));
 287
 288         switch (PTR_ERR(irb)) {
 289         case -EIO:
 290                 dev_err(&cdev->dev,
 291                         "An I/O-error occurred on the CTCM device\n");
 292                 break;
 293         case -ETIMEDOUT:
 294                 dev_err(&cdev->dev,
 295                         "An adapter hardware operation timed out\n");
 296                 break;
 297         default:
 298                 dev_err(&cdev->dev,
 299                         "An error occurred on the adapter hardware\n");
 300         }
 301         return PTR_ERR(irb);
 302 }
 303
 304
 305 /**
 306  * Check sense of a unit check.
 307  *
 308  *  ch          The channel, the sense code belongs to.
 309  *  sense       The sense code to inspect.
 310  */
 311 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
 312 {
 313         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 314                         "%s(%s): %02x",
 315                                 CTCM_FUNTAIL, ch->id, sense);
 316
 317         if (sense & SNS0_INTERVENTION_REQ) {
 318                 if (sense & 0x01) {
 319                         if (ch->sense_rc != 0x01) {
 320                                 pr_notice(
 321                                         "%s: The communication peer has "
 322                                         "disconnected\n", ch->id);
 323                                 ch->sense_rc = 0x01;
 324                         }
 325                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 326                 } else {
 327                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 328                                 pr_notice(
 329                                         "%s: The remote operating system is "
 330                                         "not available\n", ch->id);
 331                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 332                         }
 333                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 334                 }
 335         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 336                 if (sense & SNS0_BUS_OUT_CHECK) {
 337                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 338                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 339                                         "%s(%s): remote HW error %02x",
 340                                                 CTCM_FUNTAIL, ch->id, sense);
 341                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 342                         }
 343                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 344                 } else {
 345                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 346                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 347                                         "%s(%s): remote read parity error %02x",
 348                                                 CTCM_FUNTAIL, ch->id, sense);
 349                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 350                         }
 351                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 352                 }
 353         } else if (sense & SNS0_BUS_OUT_CHECK) {
 354                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 355                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 356                                 "%s(%s): BUS OUT error %02x",
 357                                         CTCM_FUNTAIL, ch->id, sense);
 358                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 359                 }
 360                 if (sense & 0x04)       /* data-streaming timeout */
 361                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 362                 else                    /* Data-transfer parity error */
 363                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 364         } else if (sense & SNS0_CMD_REJECT) {
 365                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 366                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 367                                 "%s(%s): Command rejected",
 368                                                 CTCM_FUNTAIL, ch->id);
 369                         ch->sense_rc = SNS0_CMD_REJECT;
 370                 }
 371         } else if (sense == 0) {
 372                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 373                         "%s(%s): Unit check ZERO",
 374                                         CTCM_FUNTAIL, ch->id);
 375                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 376         } else {
 377                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 378                         "%s(%s): Unit check code %02x unknown",
 379                                         CTCM_FUNTAIL, ch->id, sense);
 380                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 381         }
 382 }
 383
 384 int ctcm_ch_alloc_buffer(struct channel *ch)
 385 {
 386         clear_normalized_cda(&ch->ccw[1]);
 387         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 388         if (ch->trans_skb == NULL) {
 389                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 390                         "%s(%s): %s trans_skb allocation error",
 391                         CTCM_FUNTAIL, ch->id,
 392                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 393                                 "RX" : "TX");
 394                 return -ENOMEM;
 395         }
 396
 397         ch->ccw[1].count = ch->max_bufsize;
 398         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 399                 dev_kfree_skb(ch->trans_skb);
 400                 ch->trans_skb = NULL;
 401                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 402                         "%s(%s): %s set norm_cda failed",
 403                         CTCM_FUNTAIL, ch->id,
 404                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 405                                 "RX" : "TX");
 406                 return -ENOMEM;
 407         }
 408
 409         ch->ccw[1].count = 0;
 410         ch->trans_skb_data = ch->trans_skb->data;
 411         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 412         return 0;
 413 }
 414
 415 /*
 416  * Interface API for upper network layers
 417  */
 418
 419 /**
 420  * Open an interface.
 421  * Called from generic network layer when ifconfig up is run.
 422  *
 423  *  dev         Pointer to interface struct.
 424  *
 425  * returns 0 on success, -ERRNO on failure. (Never fails.)
 426  */
 427 int ctcm_open(struct net_device *dev)
 428 {
 429         struct ctcm_priv *priv = dev->ml_priv;
 430
 431         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 432         if (!IS_MPC(priv))
 433                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 434         return 0;
 435 }
 436
 437 /**
 438  * Close an interface.
 439  * Called from generic network layer when ifconfig down is run.
 440  *
 441  *  dev         Pointer to interface struct.
 442  *
 443  * returns 0 on success, -ERRNO on failure. (Never fails.)
 444  */
 445 int ctcm_close(struct net_device *dev)
 446 {
 447         struct ctcm_priv *priv = dev->ml_priv;
 448
 449         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 450         if (!IS_MPC(priv))
 451                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 452         return 0;
 453 }
 454
 455
 456 /**
 457  * Transmit a packet.
 458  * This is a helper function for ctcm_tx().
 459  *
 460  *  ch          Channel to be used for sending.
 461  *  skb         Pointer to struct sk_buff of packet to send.
 462  *            The linklevel header has already been set up
 463  *            by ctcm_tx().
 464  *
 465  * returns 0 on success, -ERRNO on failure. (Never fails.)
 466  */
 467 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 468 {
 469         unsigned long saveflags;
 470         struct ll_header header;
 471         int rc = 0;
 472         __u16 block_len;
 473         int ccw_idx;
 474         struct sk_buff *nskb;
 475         unsigned long hi;
 476
 477         /* we need to acquire the lock for testing the state
 478          * otherwise we can have an IRQ changing the state to
 479          * TXIDLE after the test but before acquiring the lock.
 480          */
 481         spin_lock_irqsave(&ch->collect_lock, saveflags);
 482         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 483                 int l = skb->len + LL_HEADER_LENGTH;
 484
 485                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 486                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 487                         return -EBUSY;
 488                 } else {
 489                         atomic_inc(&skb->users);
 490                         header.length = l;
 491                         header.type = skb->protocol;
 492                         header.unused = 0;
 493                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 494                                LL_HEADER_LENGTH);
 495                         skb_queue_tail(&ch->collect_queue, skb);
 496                         ch->collect_len += l;
 497                 }
 498                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 499                                 goto done;
 500         }
 501         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 502         /*
 503          * Protect skb against beeing free'd by upper
 504          * layers.
 505          */
 506         atomic_inc(&skb->users);
 507         ch->prof.txlen += skb->len;
 508         header.length = skb->len + LL_HEADER_LENGTH;
 509         header.type = skb->protocol;
 510         header.unused = 0;
 511         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 512         block_len = skb->len + 2;
 513         *((__u16 *)skb_push(skb, 2)) = block_len;
 514
 515         /*
 516          * IDAL support in CTCM is broken, so we have to
 517          * care about skb's above 2G ourselves.
 518          */
 519         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 520         if (hi) {
 521                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 522                 if (!nskb) {
 523                         atomic_dec(&skb->users);
 524                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 525                         ctcm_clear_busy(ch->netdev);
 526                         return -ENOMEM;
 527                 } else {
 528                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 529                         atomic_inc(&nskb->users);
 530                         atomic_dec(&skb->users);
 531                         dev_kfree_skb_irq(skb);
 532                         skb = nskb;
 533                 }
 534         }
 535
 536         ch->ccw[4].count = block_len;
 537         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 538                 /*
 539                  * idal allocation failed, try via copying to
 540                  * trans_skb. trans_skb usually has a pre-allocated
 541                  * idal.
 542                  */
 543                 if (ctcm_checkalloc_buffer(ch)) {
 544                         /*
 545                          * Remove our header. It gets added
 546                          * again on retransmit.
 547                          */
 548                         atomic_dec(&skb->users);
 549                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 550                         ctcm_clear_busy(ch->netdev);
 551                         return -ENOMEM;
 552                 }
 553
 554                 skb_reset_tail_pointer(ch->trans_skb);
 555                 ch->trans_skb->len = 0;
 556                 ch->ccw[1].count = skb->len;
 557                 skb_copy_from_linear_data(skb,
 558                                 skb_put(ch->trans_skb, skb->len), skb->len);
 559                 atomic_dec(&skb->users);
 560                 dev_kfree_skb_irq(skb);
 561                 ccw_idx = 0;
 562         } else {
 563                 skb_queue_tail(&ch->io_queue, skb);
 564                 ccw_idx = 3;
 565         }
 566         ch->retry = 0;
 567         fsm_newstate(ch->fsm, CTC_STATE_TX);
 568         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 569         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 570         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 571         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 572                                         (unsigned long)ch, 0xff, 0);
 573         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 574         if (ccw_idx == 3)
 575                 ch->prof.doios_single++;
 576         if (rc != 0) {
 577                 fsm_deltimer(&ch->timer);
 578                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 579                 if (ccw_idx == 3)
 580                         skb_dequeue_tail(&ch->io_queue);
 581                 /*
 582                  * Remove our header. It gets added
 583                  * again on retransmit.
 584                  */
 585                 skb_pull(skb, LL_HEADER_LENGTH + 2);
 586         } else if (ccw_idx == 0) {
 587                 struct net_device *dev = ch->netdev;
 588                 struct ctcm_priv *priv = dev->ml_priv;
 589                 priv->stats.tx_packets++;
 590                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 591         }
 592 done:
 593         ctcm_clear_busy(ch->netdev);
 594         return rc;
 595 }
 596
 597 static void ctcmpc_send_sweep_req(struct channel *rch)
 598 {
 599         struct net_device *dev = rch->netdev;
 600         struct ctcm_priv *priv;
 601         struct mpc_group *grp;
 602         struct th_sweep *header;
 603         struct sk_buff *sweep_skb;
 604         struct channel *ch;
 605         /* int rc = 0; */
 606
 607         priv = dev->ml_priv;
 608         grp = priv->mpcg;
 609         ch = priv->channel[CTCM_WRITE];
 610
 611         /* sweep processing is not complete until response and request */
 612         /* has completed for all read channels in group                */
 613         if (grp->in_sweep == 0) {
 614                 grp->in_sweep = 1;
 615                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 616                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 617         }
 618
 619         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 620
 621         if (sweep_skb == NULL)  {
 622                 /* rc = -ENOMEM; */
 623                                 goto nomem;
 624         }
 625
 626         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 627
 628         if (!header) {
 629                 dev_kfree_skb_any(sweep_skb);
 630                 /* rc = -ENOMEM; */
 631                                 goto nomem;
 632         }
 633
 634         header->th.th_seg       = 0x00 ;
 635         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 636         header->th.th_blk_flag  = 0x00;
 637         header->th.th_is_xid    = 0x00;
 638         header->th.th_seq_num   = 0x00;
 639         header->sw.th_last_seq  = ch->th_seq_num;
 640
 641         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 642
 643         kfree(header);
 644
 645         dev->trans_start = jiffies;
 646         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 647
 648         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 649
 650         return;
 651
 652 nomem:
 653         grp->in_sweep = 0;
 654         ctcm_clear_busy(dev);
 655         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 656
 657         return;
 658 }
 659
 660 /*
 661  * MPC mode version of transmit_skb
 662  */
 663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 664 {
 665         struct pdu *p_header;
 666         struct net_device *dev = ch->netdev;
 667         struct ctcm_priv *priv = dev->ml_priv;
 668         struct mpc_group *grp = priv->mpcg;
 669         struct th_header *header;
 670         struct sk_buff *nskb;
 671         int rc = 0;
 672         int ccw_idx;
 673         unsigned long hi;
 674         unsigned long saveflags = 0;    /* avoids compiler warning */
 675         __u16 block_len;
 676
 677         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 678                         __func__, dev->name, smp_processor_id(), ch,
 679                                         ch->id, fsm_getstate_str(ch->fsm));
 680
 681         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 682                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 683                 atomic_inc(&skb->users);
 684                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 685
 686                 if (!p_header) {
 687                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 688                                 goto nomem_exit;
 689                 }
 690
 691                 p_header->pdu_offset = skb->len;
 692                 p_header->pdu_proto = 0x01;
 693                 p_header->pdu_flag = 0x00;
 694                 if (skb->protocol == ntohs(ETH_P_SNAP)) {
 695                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 696                 } else {
 697                         p_header->pdu_flag |= PDU_FIRST;
 698                 }
 699                 p_header->pdu_seq = 0;
 700                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 701                        PDU_HEADER_LENGTH);
 702
 703                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 704                                 "pdu header and data for up to 32 bytes:\n",
 705                                 __func__, dev->name, skb->len);
 706                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 707
 708                 skb_queue_tail(&ch->collect_queue, skb);
 709                 ch->collect_len += skb->len;
 710                 kfree(p_header);
 711
 712                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 713                         goto done;
 714         }
 715
 716         /*
 717          * Protect skb against beeing free'd by upper
 718          * layers.
 719          */
 720         atomic_inc(&skb->users);
 721
 722         block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 723         /*
 724          * IDAL support in CTCM is broken, so we have to
 725          * care about skb's above 2G ourselves.
 726          */
 727         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 728         if (hi) {
 729                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 730                 if (!nskb) {
 731                         goto nomem_exit;
 732                 } else {
 733                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 734                         atomic_inc(&nskb->users);
 735                         atomic_dec(&skb->users);
 736                         dev_kfree_skb_irq(skb);
 737                         skb = nskb;
 738                 }
 739         }
 740
 741         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 742
 743         if (!p_header)
 744                 goto nomem_exit;
 745
 746         p_header->pdu_offset = skb->len;
 747         p_header->pdu_proto = 0x01;
 748         p_header->pdu_flag = 0x00;
 749         p_header->pdu_seq = 0;
 750         if (skb->protocol == ntohs(ETH_P_SNAP)) {
 751                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 752         } else {
 753                 p_header->pdu_flag |= PDU_FIRST;
 754         }
 755         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 756
 757         kfree(p_header);
 758
 759         if (ch->collect_len > 0) {
 760                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 761                 skb_queue_tail(&ch->collect_queue, skb);
 762                 ch->collect_len += skb->len;
 763                 skb = skb_dequeue(&ch->collect_queue);
 764                 ch->collect_len -= skb->len;
 765                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 766         }
 767
 768         p_header = (struct pdu *)skb->data;
 769         p_header->pdu_flag |= PDU_LAST;
 770
 771         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 772
 773         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 774         if (!header)
 775                 goto nomem_exit;
 776
 777         header->th_seg = 0x00;
 778         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 779         header->th_blk_flag = 0x00;
 780         header->th_is_xid = 0x00;          /* Just data here */
 781         ch->th_seq_num++;
 782         header->th_seq_num = ch->th_seq_num;
 783
 784         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 785                        __func__, dev->name, ch->th_seq_num);
 786
 787         /* put the TH on the packet */
 788         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 789
 790         kfree(header);
 791
 792         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 793                         "up to 32 bytes sent to vtam:\n",
 794                                 __func__, dev->name, skb->len);
 795         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 796
 797         ch->ccw[4].count = skb->len;
 798         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 799                 /*
 800                  * idal allocation failed, try via copying to trans_skb.
 801                  * trans_skb usually has a pre-allocated idal.
 802                  */
 803                 if (ctcm_checkalloc_buffer(ch)) {
 804                         /*
 805                          * Remove our header.
 806                          * It gets added again on retransmit.
 807                          */
 808                                 goto nomem_exit;
 809                 }
 810
 811                 skb_reset_tail_pointer(ch->trans_skb);
 812                 ch->trans_skb->len = 0;
 813                 ch->ccw[1].count = skb->len;
 814                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
 815                 atomic_dec(&skb->users);
 816                 dev_kfree_skb_irq(skb);
 817                 ccw_idx = 0;
 818                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 819                                 "up to 32 bytes sent to vtam:\n",
 820                                 __func__, dev->name, ch->trans_skb->len);
 821                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 822                                 min_t(int, 32, ch->trans_skb->len));
 823         } else {
 824                 skb_queue_tail(&ch->io_queue, skb);
 825                 ccw_idx = 3;
 826         }
 827         ch->retry = 0;
 828         fsm_newstate(ch->fsm, CTC_STATE_TX);
 829         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 830
 831         if (do_debug_ccw)
 832                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 833                                         sizeof(struct ccw1) * 3);
 834
 835         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 836         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 837         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 838                                         (unsigned long)ch, 0xff, 0);
 839         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 840         if (ccw_idx == 3)
 841                 ch->prof.doios_single++;
 842         if (rc != 0) {
 843                 fsm_deltimer(&ch->timer);
 844                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 845                 if (ccw_idx == 3)
 846                         skb_dequeue_tail(&ch->io_queue);
 847         } else if (ccw_idx == 0) {
 848                 priv->stats.tx_packets++;
 849                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 850         }
 851         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 852                 ctcmpc_send_sweep_req(ch);
 853
 854         goto done;
 855 nomem_exit:
 856         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 857                         "%s(%s): MEMORY allocation ERROR\n",
 858                         CTCM_FUNTAIL, ch->id);
 859         rc = -ENOMEM;
 860         atomic_dec(&skb->users);
 861         dev_kfree_skb_any(skb);
 862         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 863 done:
 864         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 865         return rc;
 866 }
 867
 868 /**
 869  * Start transmission of a packet.
 870  * Called from generic network device layer.
 871  *
 872  *  skb         Pointer to buffer containing the packet.
 873  *  dev         Pointer to interface struct.
 874  *
 875  * returns 0 if packet consumed, !0 if packet rejected.
 876  *         Note: If we return !0, then the packet is free'd by
 877  *               the generic network layer.
 878  */
 879 /* first merge version - leaving both functions separated */
 880 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 881 {
 882         struct ctcm_priv *priv = dev->ml_priv;
 883
 884         if (skb == NULL) {
 885                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 886                                 "%s(%s): NULL sk_buff passed",
 887                                         CTCM_FUNTAIL, dev->name);
 888                 priv->stats.tx_dropped++;
 889                 return NETDEV_TX_OK;
 890         }
 891         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 892                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 893                         "%s(%s): Got sk_buff with head room < %ld bytes",
 894                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 895                 dev_kfree_skb(skb);
 896                 priv->stats.tx_dropped++;
 897                 return NETDEV_TX_OK;
 898         }
 899
 900         /*
 901          * If channels are not running, try to restart them
 902          * and throw away packet.
 903          */
 904         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 905                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 906                 dev_kfree_skb(skb);
 907                 priv->stats.tx_dropped++;
 908                 priv->stats.tx_errors++;
 909                 priv->stats.tx_carrier_errors++;
 910                 return NETDEV_TX_OK;
 911         }
 912
 913         if (ctcm_test_and_set_busy(dev))
 914                 return NETDEV_TX_BUSY;
 915
 916         dev->trans_start = jiffies;
 917         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 918                 return NETDEV_TX_BUSY;
 919         return NETDEV_TX_OK;
 920 }
 921
 922 /* unmerged MPC variant of ctcm_tx */
 923 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 924 {
 925         int len = 0;
 926         struct ctcm_priv *priv = dev->ml_priv;
 927         struct mpc_group *grp  = priv->mpcg;
 928         struct sk_buff *newskb = NULL;
 929
 930         /*
 931          * Some sanity checks ...
 932          */
 933         if (skb == NULL) {
 934                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 935                         "%s(%s): NULL sk_buff passed",
 936                                         CTCM_FUNTAIL, dev->name);
 937                 priv->stats.tx_dropped++;
 938                                         goto done;
 939         }
 940         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 941                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 942                         "%s(%s): Got sk_buff with head room < %ld bytes",
 943                         CTCM_FUNTAIL, dev->name,
 944                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 945
 946                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 947
 948                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 949                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 950
 951                 if (!newskb) {
 952                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 953                                 "%s: %s: __dev_alloc_skb failed",
 954                                                 __func__, dev->name);
 955
 956                         dev_kfree_skb_any(skb);
 957                         priv->stats.tx_dropped++;
 958                         priv->stats.tx_errors++;
 959                         priv->stats.tx_carrier_errors++;
 960                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 961                                         goto done;
 962                 }
 963                 newskb->protocol = skb->protocol;
 964                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 965                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 966                 dev_kfree_skb_any(skb);
 967                 skb = newskb;
 968         }
 969
 970         /*
 971          * If channels are not running,
 972          * notify anybody about a link failure and throw
 973          * away packet.
 974          */
 975         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 976            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 977                 dev_kfree_skb_any(skb);
 978                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 979                         "%s(%s): inactive MPCGROUP - dropped",
 980                                         CTCM_FUNTAIL, dev->name);
 981                 priv->stats.tx_dropped++;
 982                 priv->stats.tx_errors++;
 983                 priv->stats.tx_carrier_errors++;
 984                                         goto done;
 985         }
 986
 987         if (ctcm_test_and_set_busy(dev)) {
 988                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 989                         "%s(%s): device busy - dropped",
 990                                         CTCM_FUNTAIL, dev->name);
 991                 dev_kfree_skb_any(skb);
 992                 priv->stats.tx_dropped++;
 993                 priv->stats.tx_errors++;
 994                 priv->stats.tx_carrier_errors++;
 995                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 996                                         goto done;
 997         }
 998
 999         dev->trans_start = jiffies;
1000         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
1001                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1002                         "%s(%s): device error - dropped",
1003                                         CTCM_FUNTAIL, dev->name);
1004                 dev_kfree_skb_any(skb);
1005                 priv->stats.tx_dropped++;
1006                 priv->stats.tx_errors++;
1007                 priv->stats.tx_carrier_errors++;
1008                 ctcm_clear_busy(dev);
1009                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1010                                         goto done;
1011         }
1012         ctcm_clear_busy(dev);
1013 done:
1014         if (do_debug)
1015                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1016
1017         return NETDEV_TX_OK;    /* handle freeing of skb here */
1018 }
1019
1020
1021 /**
1022  * Sets MTU of an interface.
1023  *
1024  *  dev         Pointer to interface struct.
1025  *  new_mtu     The new MTU to use for this interface.
1026  *
1027  * returns 0 on success, -EINVAL if MTU is out of valid range.
1028  *         (valid range is 576 .. 65527). If VM is on the
1029  *         remote side, maximum MTU is 32760, however this is
1030  *         not checked here.
1031  */
1032 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1033 {
1034         struct ctcm_priv *priv;
1035         int max_bufsize;
1036
1037         if (new_mtu < 576 || new_mtu > 65527)
1038                 return -EINVAL;
1039
1040         priv = dev->ml_priv;
1041         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1042
1043         if (IS_MPC(priv)) {
1044                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1045                         return -EINVAL;
1046                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1047         } else {
1048                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1049                         return -EINVAL;
1050                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1051         }
1052         dev->mtu = new_mtu;
1053         return 0;
1054 }
1055
1056 /**
1057  * Returns interface statistics of a device.
1058  *
1059  *  dev         Pointer to interface struct.
1060  *
1061  * returns Pointer to stats struct of this interface.
1062  */
1063 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1064 {
1065         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1066 }
1067
1068 static void ctcm_free_netdevice(struct net_device *dev)
1069 {
1070         struct ctcm_priv *priv;
1071         struct mpc_group *grp;
1072
1073         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1074                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1075         priv = dev->ml_priv;
1076         if (priv) {
1077                 grp = priv->mpcg;
1078                 if (grp) {
1079                         if (grp->fsm)
1080                                 kfree_fsm(grp->fsm);
1081                         if (grp->xid_skb)
1082                                 dev_kfree_skb(grp->xid_skb);
1083                         if (grp->rcvd_xid_skb)
1084                                 dev_kfree_skb(grp->rcvd_xid_skb);
1085                         tasklet_kill(&grp->mpc_tasklet2);
1086                         kfree(grp);
1087                         priv->mpcg = NULL;
1088                 }
1089                 if (priv->fsm) {
1090                         kfree_fsm(priv->fsm);
1091                         priv->fsm = NULL;
1092                 }
1093                 kfree(priv->xid);
1094                 priv->xid = NULL;
1095         /*
1096          * Note: kfree(priv); is done in "opposite" function of
1097          * allocator function probe_device which is remove_device.
1098          */
1099         }
1100 #ifdef MODULE
1101         free_netdev(dev);
1102 #endif
1103 }
1104
1105 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1106
1107 static const struct net_device_ops ctcm_netdev_ops = {
1108         .ndo_open               = ctcm_open,
1109         .ndo_stop               = ctcm_close,
1110         .ndo_get_stats          = ctcm_stats,
1111         .ndo_change_mtu         = ctcm_change_mtu,
1112         .ndo_start_xmit         = ctcm_tx,
1113 };
1114
1115 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1116         .ndo_open               = ctcm_open,
1117         .ndo_stop               = ctcm_close,
1118         .ndo_get_stats          = ctcm_stats,
1119         .ndo_change_mtu         = ctcm_change_mtu,
1120         .ndo_start_xmit         = ctcmpc_tx,
1121 };
1122
1123 void static ctcm_dev_setup(struct net_device *dev)
1124 {
1125         dev->type = ARPHRD_SLIP;
1126         dev->tx_queue_len = 100;
1127         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1128 }
1129
1130 /*
1131  * Initialize everything of the net device except the name and the
1132  * channel structs.
1133  */
1134 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1135 {
1136         struct net_device *dev;
1137         struct mpc_group *grp;
1138         if (!priv)
1139                 return NULL;
1140
1141         if (IS_MPC(priv))
1142                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1143         else
1144                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1145
1146         if (!dev) {
1147                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1148                         "%s: MEMORY allocation ERROR",
1149                         CTCM_FUNTAIL);
1150                 return NULL;
1151         }
1152         dev->ml_priv = priv;
1153         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1154                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1155                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1156         if (priv->fsm == NULL) {
1157                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1158                 free_netdev(dev);
1159                 return NULL;
1160         }
1161         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1162         fsm_settimer(priv->fsm, &priv->restart_timer);
1163
1164         if (IS_MPC(priv)) {
1165                 /*  MPC Group Initializations  */
1166                 grp = ctcmpc_init_mpc_group(priv);
1167                 if (grp == NULL) {
1168                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1169                         free_netdev(dev);
1170                         return NULL;
1171                 }
1172                 tasklet_init(&grp->mpc_tasklet2,
1173                                 mpc_group_ready, (unsigned long)dev);
1174                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1175                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1176
1177                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1178                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1179                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1180         } else {
1181                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1182                 dev->netdev_ops = &ctcm_netdev_ops;
1183                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1184         }
1185
1186         CTCMY_DBF_DEV(SETUP, dev, "finished");
1187
1188         return dev;
1189 }
1190
1191 /**
1192  * Main IRQ handler.
1193  *
1194  *  cdev        The ccw_device the interrupt is for.
1195  *  intparm     interruption parameter.
1196  *  irb         interruption response block.
1197  */
1198 static void ctcm_irq_handler(struct ccw_device *cdev,
1199                                 unsigned long intparm, struct irb *irb)
1200 {
1201         struct channel          *ch;
1202         struct net_device       *dev;
1203         struct ctcm_priv        *priv;
1204         struct ccwgroup_device  *cgdev;
1205         int cstat;
1206         int dstat;
1207
1208         kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
1209         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1210                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1211
1212         if (ctcm_check_irb_error(cdev, irb))
1213                 return;
1214
1215         cgdev = dev_get_drvdata(&cdev->dev);
1216
1217         cstat = irb->scsw.cmd.cstat;
1218         dstat = irb->scsw.cmd.dstat;
1219
1220         /* Check for unsolicited interrupts. */
1221         if (cgdev == NULL) {
1222                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1223                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1224                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1225                 dev_warn(&cdev->dev,
1226                         "The adapter received a non-specific IRQ\n");
1227                 return;
1228         }
1229
1230         priv = dev_get_drvdata(&cgdev->dev);
1231
1232         /* Try to extract channel from driver data. */
1233         if (priv->channel[CTCM_READ]->cdev == cdev)
1234                 ch = priv->channel[CTCM_READ];
1235         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1236                 ch = priv->channel[CTCM_WRITE];
1237         else {
1238                 dev_err(&cdev->dev,
1239                         "%s: Internal error: Can't determine channel for "
1240                         "interrupt device %s\n",
1241                         __func__, dev_name(&cdev->dev));
1242                         /* Explain: inconsistent internal structures */
1243                 return;
1244         }
1245
1246         dev = ch->netdev;
1247         if (dev == NULL) {
1248                 dev_err(&cdev->dev,
1249                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1250                         __func__, ch);
1251                         /* Explain: inconsistent internal structures */
1252                 return;
1253         }
1254
1255         /* Copy interruption response block. */
1256         memcpy(ch->irb, irb, sizeof(struct irb));
1257
1258         /* Issue error message and return on subchannel error code */
1259         if (irb->scsw.cmd.cstat) {
1260                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1261                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1262                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1263                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1264                 dev_warn(&cdev->dev,
1265                                 "A check occurred on the subchannel\n");
1266                 return;
1267         }
1268
1269         /* Check the reason-code of a unit check */
1270         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1271                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1272                         /* print it only once */
1273                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1274                                 "%s(%s): sense=%02x, ds=%02x",
1275                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1276                 ccw_unit_check(ch, irb->ecw[0]);
1277                 return;
1278         }
1279         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1280                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1281                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1282                 else
1283                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1284                 return;
1285         }
1286         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1287                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1288                 return;
1289         }
1290         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1291             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1292             (irb->scsw.cmd.stctl ==
1293              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1294                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1295         else
1296                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1297
1298 }
1299
1300 /**
1301  * Add ctcm specific attributes.
1302  * Add ctcm private data.
1303  *
1304  *  cgdev       pointer to ccwgroup_device just added
1305  *
1306  * returns 0 on success, !0 on failure.
1307  */
1308 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1309 {
1310         struct ctcm_priv *priv;
1311         int rc;
1312
1313         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1314                         "%s %p",
1315                         __func__, cgdev);
1316
1317         if (!get_device(&cgdev->dev))
1318                 return -ENODEV;
1319
1320         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1321         if (!priv) {
1322                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1323                         "%s: memory allocation failure",
1324                         CTCM_FUNTAIL);
1325                 put_device(&cgdev->dev);
1326                 return -ENOMEM;
1327         }
1328
1329         rc = ctcm_add_files(&cgdev->dev);
1330         if (rc) {
1331                 kfree(priv);
1332                 put_device(&cgdev->dev);
1333                 return rc;
1334         }
1335         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1336         cgdev->cdev[0]->handler = ctcm_irq_handler;
1337         cgdev->cdev[1]->handler = ctcm_irq_handler;
1338         dev_set_drvdata(&cgdev->dev, priv);
1339
1340         return 0;
1341 }
1342
1343 /**
1344  * Add a new channel to the list of channels.
1345  * Keeps the channel list sorted.
1346  *
1347  *  cdev        The ccw_device to be added.
1348  *  type        The type class of the new channel.
1349  *  priv        Points to the private data of the ccwgroup_device.
1350  *
1351  * returns 0 on success, !0 on error.
1352  */
1353 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1354                                 struct ctcm_priv *priv)
1355 {
1356         struct channel **c = &channels;
1357         struct channel *ch;
1358         int ccw_num;
1359         int rc = 0;
1360
1361         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1362                 "%s(%s), type %d, proto %d",
1363                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1364
1365         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1366         if (ch == NULL)
1367                 return -ENOMEM;
1368
1369         ch->protocol = priv->protocol;
1370         if (IS_MPC(priv)) {
1371                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1372                 if (ch->discontact_th == NULL)
1373                                         goto nomem_return;
1374
1375                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1376                 tasklet_init(&ch->ch_disc_tasklet,
1377                         mpc_action_send_discontact, (unsigned long)ch);
1378
1379                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1380                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1381                 ccw_num = 17;
1382         } else
1383                 ccw_num = 8;
1384
1385         ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1386         if (ch->ccw == NULL)
1387                                         goto nomem_return;
1388
1389         ch->cdev = cdev;
1390         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1391         ch->type = type;
1392
1393         /**
1394          * "static" ccws are used in the following way:
1395          *
1396          * ccw[0..2] (Channel program for generic I/O):
1397          *           0: prepare
1398          *           1: read or write (depending on direction) with fixed
1399          *              buffer (idal allocated once when buffer is allocated)
1400          *           2: nop
1401          * ccw[3..5] (Channel program for direct write of packets)
1402          *           3: prepare
1403          *           4: write (idal allocated on every write).
1404          *           5: nop
1405          * ccw[6..7] (Channel program for initial channel setup):
1406          *           6: set extended mode
1407          *           7: nop
1408          *
1409          * ch->ccw[0..5] are initialized in ch_action_start because
1410          * the channel's direction is yet unknown here.
1411          *
1412          * ccws used for xid2 negotiations
1413          *  ch-ccw[8-14] need to be used for the XID exchange either
1414          *    X side XID2 Processing
1415          *       8:  write control
1416          *       9:  write th
1417          *           10: write XID
1418          *           11: read th from secondary
1419          *           12: read XID   from secondary
1420          *           13: read 4 byte ID
1421          *           14: nop
1422          *    Y side XID Processing
1423          *           8:  sense
1424          *       9:  read th
1425          *           10: read XID
1426          *           11: write th
1427          *           12: write XID
1428          *           13: write 4 byte ID
1429          *           14: nop
1430          *
1431          *  ccws used for double noop due to VM timing issues
1432          *  which result in unrecoverable Busy on channel
1433          *       15: nop
1434          *       16: nop
1435          */
1436         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1437         ch->ccw[6].flags        = CCW_FLAG_SLI;
1438
1439         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1440         ch->ccw[7].flags        = CCW_FLAG_SLI;
1441
1442         if (IS_MPC(priv)) {
1443                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1444                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1445                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1446                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1447
1448                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1449                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1450
1451                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1452                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1453                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1454                                 mpc_ch_fsm_len, GFP_KERNEL);
1455         } else {
1456                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1457                                 ctc_ch_event_names, CTC_NR_STATES,
1458                                 CTC_NR_EVENTS, ch_fsm,
1459                                 ch_fsm_len, GFP_KERNEL);
1460         }
1461         if (ch->fsm == NULL)
1462                                 goto free_return;
1463
1464         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1465
1466         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1467         if (ch->irb == NULL)
1468                                 goto nomem_return;
1469
1470         while (*c && ctcm_less_than((*c)->id, ch->id))
1471                 c = &(*c)->next;
1472
1473         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1474                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1475                                 "%s (%s) already in list, using old entry",
1476                                 __func__, (*c)->id);
1477
1478                                 goto free_return;
1479         }
1480
1481         spin_lock_init(&ch->collect_lock);
1482
1483         fsm_settimer(ch->fsm, &ch->timer);
1484         skb_queue_head_init(&ch->io_queue);
1485         skb_queue_head_init(&ch->collect_queue);
1486
1487         if (IS_MPC(priv)) {
1488                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1489                 skb_queue_head_init(&ch->sweep_queue);
1490         }
1491         ch->next = *c;
1492         *c = ch;
1493         return 0;
1494
1495 nomem_return:
1496         rc = -ENOMEM;
1497
1498 free_return:    /* note that all channel pointers are 0 or valid */
1499         kfree(ch->ccw);
1500         kfree(ch->discontact_th);
1501         kfree_fsm(ch->fsm);
1502         kfree(ch->irb);
1503         kfree(ch);
1504         return rc;
1505 }
1506
1507 /*
1508  * Return type of a detected device.
1509  */
1510 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1511 {
1512         enum ctcm_channel_types type;
1513         type = (enum ctcm_channel_types)id->driver_info;
1514
1515         if (type == ctcm_channel_type_ficon)
1516                 type = ctcm_channel_type_escon;
1517
1518         return type;
1519 }
1520
1521 /**
1522  *
1523  * Setup an interface.
1524  *
1525  *  cgdev       Device to be setup.
1526  *
1527  * returns 0 on success, !0 on failure.
1528  */
1529 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1530 {
1531         char read_id[CTCM_ID_SIZE];
1532         char write_id[CTCM_ID_SIZE];
1533         int direction;
1534         enum ctcm_channel_types type;
1535         struct ctcm_priv *priv;
1536         struct net_device *dev;
1537         struct ccw_device *cdev0;
1538         struct ccw_device *cdev1;
1539         struct channel *readc;
1540         struct channel *writec;
1541         int ret;
1542         int result;
1543
1544         priv = dev_get_drvdata(&cgdev->dev);
1545         if (!priv) {
1546                 result = -ENODEV;
1547                 goto out_err_result;
1548         }
1549
1550         cdev0 = cgdev->cdev[0];
1551         cdev1 = cgdev->cdev[1];
1552
1553         type = get_channel_type(&cdev0->id);
1554
1555         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1556         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1557
1558         ret = add_channel(cdev0, type, priv);
1559         if (ret) {
1560                 result = ret;
1561                 goto out_err_result;
1562         }
1563         ret = add_channel(cdev1, type, priv);
1564         if (ret) {
1565                 result = ret;
1566                 goto out_remove_channel1;
1567         }
1568
1569         ret = ccw_device_set_online(cdev0);
1570         if (ret != 0) {
1571                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1572                         "%s(%s) set_online rc=%d",
1573                                 CTCM_FUNTAIL, read_id, ret);
1574                 result = -EIO;
1575                 goto out_remove_channel2;
1576         }
1577
1578         ret = ccw_device_set_online(cdev1);
1579         if (ret != 0) {
1580                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1581                         "%s(%s) set_online rc=%d",
1582                                 CTCM_FUNTAIL, write_id, ret);
1583
1584                 result = -EIO;
1585                 goto out_ccw1;
1586         }
1587
1588         dev = ctcm_init_netdevice(priv);
1589         if (dev == NULL) {
1590                 result = -ENODEV;
1591                 goto out_ccw2;
1592         }
1593
1594         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1595                 priv->channel[direction] =
1596                         channel_get(type, direction == CTCM_READ ?
1597                                 read_id : write_id, direction);
1598                 if (priv->channel[direction] == NULL) {
1599                         if (direction == CTCM_WRITE)
1600                                 channel_free(priv->channel[CTCM_READ]);
1601                         goto out_dev;
1602                 }
1603                 priv->channel[direction]->netdev = dev;
1604                 priv->channel[direction]->protocol = priv->protocol;
1605                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1606         }
1607         /* sysfs magic */
1608         SET_NETDEV_DEV(dev, &cgdev->dev);
1609
1610         if (register_netdev(dev)) {
1611                 result = -ENODEV;
1612                 goto out_dev;
1613         }
1614
1615         if (ctcm_add_attributes(&cgdev->dev)) {
1616                 result = -ENODEV;
1617                 goto out_unregister;
1618         }
1619
1620         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1621
1622         dev_info(&dev->dev,
1623                 "setup OK : r/w = %s/%s, protocol : %d\n",
1624                         priv->channel[CTCM_READ]->id,
1625                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1626
1627         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1628                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1629                         priv->channel[CTCM_READ]->id,
1630                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1631
1632         return 0;
1633 out_unregister:
1634         unregister_netdev(dev);
1635 out_dev:
1636         ctcm_free_netdevice(dev);
1637 out_ccw2:
1638         ccw_device_set_offline(cgdev->cdev[1]);
1639 out_ccw1:
1640         ccw_device_set_offline(cgdev->cdev[0]);
1641 out_remove_channel2:
1642         readc = channel_get(type, read_id, CTCM_READ);
1643         channel_remove(readc);
1644 out_remove_channel1:
1645         writec = channel_get(type, write_id, CTCM_WRITE);
1646         channel_remove(writec);
1647 out_err_result:
1648         return result;
1649 }
1650
1651 /**
1652  * Shutdown an interface.
1653  *
1654  *  cgdev       Device to be shut down.
1655  *
1656  * returns 0 on success, !0 on failure.
1657  */
1658 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1659 {
1660         struct ctcm_priv *priv;
1661         struct net_device *dev;
1662
1663         priv = dev_get_drvdata(&cgdev->dev);
1664         if (!priv)
1665                 return -ENODEV;
1666
1667         if (priv->channel[CTCM_READ]) {
1668                 dev = priv->channel[CTCM_READ]->netdev;
1669                 CTCM_DBF_DEV(SETUP, dev, "");
1670                 /* Close the device */
1671                 ctcm_close(dev);
1672                 dev->flags &= ~IFF_RUNNING;
1673                 ctcm_remove_attributes(&cgdev->dev);
1674                 channel_free(priv->channel[CTCM_READ]);
1675         } else
1676                 dev = NULL;
1677
1678         if (priv->channel[CTCM_WRITE])
1679                 channel_free(priv->channel[CTCM_WRITE]);
1680
1681         if (dev) {
1682                 unregister_netdev(dev);
1683                 ctcm_free_netdevice(dev);
1684         }
1685
1686         if (priv->fsm)
1687                 kfree_fsm(priv->fsm);
1688
1689         ccw_device_set_offline(cgdev->cdev[1]);
1690         ccw_device_set_offline(cgdev->cdev[0]);
1691
1692         if (priv->channel[CTCM_READ])
1693                 channel_remove(priv->channel[CTCM_READ]);
1694         if (priv->channel[CTCM_WRITE])
1695                 channel_remove(priv->channel[CTCM_WRITE]);
1696         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1697
1698         return 0;
1699
1700 }
1701
1702
1703 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1704 {
1705         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1706
1707         BUG_ON(priv == NULL);
1708
1709         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1710                         "removing device %p, proto : %d",
1711                         cgdev, priv->protocol);
1712
1713         if (cgdev->state == CCWGROUP_ONLINE)
1714                 ctcm_shutdown_device(cgdev);
1715         ctcm_remove_files(&cgdev->dev);
1716         dev_set_drvdata(&cgdev->dev, NULL);
1717         kfree(priv);
1718         put_device(&cgdev->dev);
1719 }
1720
1721 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1722 {
1723         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1724
1725         if (gdev->state == CCWGROUP_OFFLINE)
1726                 return 0;
1727         netif_device_detach(priv->channel[CTCM_READ]->netdev);
1728         ctcm_close(priv->channel[CTCM_READ]->netdev);
1729         if (!wait_event_timeout(priv->fsm->wait_q,
1730             fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1731                 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1732                 return -EBUSY;
1733         }
1734         ccw_device_set_offline(gdev->cdev[1]);
1735         ccw_device_set_offline(gdev->cdev[0]);
1736         return 0;
1737 }
1738
1739 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1740 {
1741         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1742         int rc;
1743
1744         if (gdev->state == CCWGROUP_OFFLINE)
1745                 return 0;
1746         rc = ccw_device_set_online(gdev->cdev[1]);
1747         if (rc)
1748                 goto err_out;
1749         rc = ccw_device_set_online(gdev->cdev[0]);
1750         if (rc)
1751                 goto err_out;
1752         ctcm_open(priv->channel[CTCM_READ]->netdev);
1753 err_out:
1754         netif_device_attach(priv->channel[CTCM_READ]->netdev);
1755         return rc;
1756 }
1757
1758 static struct ccw_device_id ctcm_ids[] = {
1759         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1760         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1761         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1762         {},
1763 };
1764 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1765
1766 static struct ccw_driver ctcm_ccw_driver = {
1767         .driver = {
1768                 .owner  = THIS_MODULE,
1769                 .name   = "ctcm",
1770         },
1771         .ids    = ctcm_ids,
1772         .probe  = ccwgroup_probe_ccwdev,
1773         .remove = ccwgroup_remove_ccwdev,
1774 };
1775
1776 static struct ccwgroup_driver ctcm_group_driver = {
1777         .driver = {
1778                 .owner  = THIS_MODULE,
1779                 .name   = CTC_DRIVER_NAME,
1780         },
1781         .max_slaves  = 2,
1782         .driver_id   = 0xC3E3C3D4,      /* CTCM */
1783         .probe       = ctcm_probe_device,
1784         .remove      = ctcm_remove_device,
1785         .set_online  = ctcm_new_device,
1786         .set_offline = ctcm_shutdown_device,
1787         .freeze      = ctcm_pm_suspend,
1788         .thaw        = ctcm_pm_resume,
1789         .restore     = ctcm_pm_resume,
1790 };
1791
1792 static ssize_t
1793 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1794                         size_t count)
1795 {
1796         int err;
1797
1798         err = ccwgroup_create_from_string(ctcm_root_dev,
1799                                           ctcm_group_driver.driver_id,
1800                                           &ctcm_ccw_driver, 2, buf);
1801         return err ? err : count;
1802 }
1803
1804 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1805
1806 static struct attribute *ctcm_group_attrs[] = {
1807         &driver_attr_group.attr,
1808         NULL,
1809 };
1810
1811 static struct attribute_group ctcm_group_attr_group = {
1812         .attrs = ctcm_group_attrs,
1813 };
1814
1815 static const struct attribute_group *ctcm_group_attr_groups[] = {
1816         &ctcm_group_attr_group,
1817         NULL,
1818 };
1819
1820 /*
1821  * Module related routines
1822  */
1823
1824 /*
1825  * Prepare to be unloaded. Free IRQ's and release all resources.
1826  * This is called just before this module is unloaded. It is
1827  * not called, if the usage count is !0, so we don't need to check
1828  * for that.
1829  */
1830 static void __exit ctcm_exit(void)
1831 {
1832         driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1833         ccwgroup_driver_unregister(&ctcm_group_driver);
1834         ccw_driver_unregister(&ctcm_ccw_driver);
1835         root_device_unregister(ctcm_root_dev);
1836         ctcm_unregister_dbf_views();
1837         pr_info("CTCM driver unloaded\n");
1838 }
1839
1840 /*
1841  * Print Banner.
1842  */
1843 static void print_banner(void)
1844 {
1845         pr_info("CTCM driver initialized\n");
1846 }
1847
1848 /**
1849  * Initialize module.
1850  * This is called just after the module is loaded.
1851  *
1852  * returns 0 on success, !0 on error.
1853  */
1854 static int __init ctcm_init(void)
1855 {
1856         int ret;
1857
1858         channels = NULL;
1859
1860         ret = ctcm_register_dbf_views();
1861         if (ret)
1862                 goto out_err;
1863         ctcm_root_dev = root_device_register("ctcm");
1864         ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1865         if (ret)
1866                 goto register_err;
1867         ret = ccw_driver_register(&ctcm_ccw_driver);
1868         if (ret)
1869                 goto ccw_err;
1870         ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1871         ret = ccwgroup_driver_register(&ctcm_group_driver);
1872         if (ret)
1873                 goto ccwgroup_err;
1874         print_banner();
1875         return 0;
1876
1877 ccwgroup_err:
1878         ccw_driver_unregister(&ctcm_ccw_driver);
1879 ccw_err:
1880         root_device_unregister(ctcm_root_dev);
1881 register_err:
1882         ctcm_unregister_dbf_views();
1883 out_err:
1884         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1885                 __func__, ret);
1886         return ret;
1887 }
1888
1889 module_init(ctcm_init);
1890 module_exit(ctcm_exit);
1891
1892 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1893 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1894 MODULE_LICENSE("GPL");
1895