drivers/s390/net/ctcm_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2001, 2009
   4  * Author(s):
   5  *      Original CTC driver(s):
   6  *              Fritz Elfert (felfert@millenux.com)
   7  *              Dieter Wellerdiek (wel@de.ibm.com)
   8  *              Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  *              Denis Joseph Barrow (barrow_dj@yahoo.com)
  10  *              Jochen Roehrig (roehrig@de.ibm.com)
  11  *              Cornelia Huck <cornelia.huck@de.ibm.com>
  12  *      MPC additions:
  13  *              Belinda Thompson (belindat@us.ibm.com)
  14  *              Andy Richter (richtera@us.ibm.com)
  15  *      Revived by:
  16  *              Peter Tiedemann (ptiedem@de.ibm.com)
  17  */
  18
  19 #undef DEBUG
  20 #undef DEBUGDATA
  21 #undef DEBUGCCW
  22
  23 #define KMSG_COMPONENT "ctcm"
  24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/timer.h>
  34 #include <linux/bitops.h>
  35
  36 #include <linux/signal.h>
  37 #include <linux/string.h>
  38
  39 #include <linux/ip.h>
  40 #include <linux/if_arp.h>
  41 #include <linux/tcp.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/ctype.h>
  44 #include <net/dst.h>
  45
  46 #include <linux/io.h>
  47 #include <asm/ccwdev.h>
  48 #include <asm/ccwgroup.h>
  49 #include <linux/uaccess.h>
  50
  51 #include <asm/idals.h>
  52
  53 #include "ctcm_fsms.h"
  54 #include "ctcm_main.h"
  55
  56 /* Some common global variables */
  57
  58 /**
  59  * The root device for ctcm group devices
  60  */
  61 static struct device *ctcm_root_dev;
  62
  63 /*
  64  * Linked list of all detected channels.
  65  */
  66 struct channel *channels;
  67
  68 /**
  69  * Unpack a just received skb and hand it over to
  70  * upper layers.
  71  *
  72  *  ch          The channel where this skb has been received.
  73  *  pskb        The received skb.
  74  */
  75 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  76 {
  77         struct net_device *dev = ch->netdev;
  78         struct ctcm_priv *priv = dev->ml_priv;
  79         __u16 len = *((__u16 *) pskb->data);
  80
  81         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  82         skb_pull(pskb, 2);
  83         pskb->dev = dev;
  84         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  85         while (len > 0) {
  86                 struct sk_buff *skb;
  87                 int skblen;
  88                 struct ll_header *header = (struct ll_header *)pskb->data;
  89
  90                 skb_pull(pskb, LL_HEADER_LENGTH);
  91                 if ((ch->protocol == CTCM_PROTO_S390) &&
  92                     (header->type != ETH_P_IP)) {
  93                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  94                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  95                                 /*
  96                                  * Check packet type only if we stick strictly
  97                                  * to S/390's protocol of OS390. This only
  98                                  * supports IP. Otherwise allow any packet
  99                                  * type.
 100                                  */
 101                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 102                                         "%s(%s): Illegal packet type 0x%04x"
 103                                         " - dropping",
 104                                         CTCM_FUNTAIL, dev->name, header->type);
 105                         }
 106                         priv->stats.rx_dropped++;
 107                         priv->stats.rx_frame_errors++;
 108                         return;
 109                 }
 110                 pskb->protocol = cpu_to_be16(header->type);
 111                 if ((header->length <= LL_HEADER_LENGTH) ||
 112                     (len <= LL_HEADER_LENGTH)) {
 113                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 114                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 115                                         "%s(%s): Illegal packet size %d(%d,%d)"
 116                                         "- dropping",
 117                                         CTCM_FUNTAIL, dev->name,
 118                                         header->length, dev->mtu, len);
 119                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 120                         }
 121
 122                         priv->stats.rx_dropped++;
 123                         priv->stats.rx_length_errors++;
 124                         return;
 125                 }
 126                 header->length -= LL_HEADER_LENGTH;
 127                 len -= LL_HEADER_LENGTH;
 128                 if ((header->length > skb_tailroom(pskb)) ||
 129                     (header->length > len)) {
 130                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 131                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 132                                         "%s(%s): Packet size %d (overrun)"
 133                                         " - dropping", CTCM_FUNTAIL,
 134                                                 dev->name, header->length);
 135                                 ch->logflags |= LOG_FLAG_OVERRUN;
 136                         }
 137
 138                         priv->stats.rx_dropped++;
 139                         priv->stats.rx_length_errors++;
 140                         return;
 141                 }
 142                 skb_put(pskb, header->length);
 143                 skb_reset_mac_header(pskb);
 144                 len -= header->length;
 145                 skb = dev_alloc_skb(pskb->len);
 146                 if (!skb) {
 147                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 148                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 149                                         "%s(%s): MEMORY allocation error",
 150                                                 CTCM_FUNTAIL, dev->name);
 151                                 ch->logflags |= LOG_FLAG_NOMEM;
 152                         }
 153                         priv->stats.rx_dropped++;
 154                         return;
 155                 }
 156                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 157                                           pskb->len);
 158                 skb_reset_mac_header(skb);
 159                 skb->dev = pskb->dev;
 160                 skb->protocol = pskb->protocol;
 161                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 162                 skblen = skb->len;
 163                 /*
 164                  * reset logflags
 165                  */
 166                 ch->logflags = 0;
 167                 priv->stats.rx_packets++;
 168                 priv->stats.rx_bytes += skblen;
 169                 netif_rx_ni(skb);
 170                 if (len > 0) {
 171                         skb_pull(pskb, header->length);
 172                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 173                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 174                                         "Overrun in ctcm_unpack_skb");
 175                                 ch->logflags |= LOG_FLAG_OVERRUN;
 176                                 return;
 177                         }
 178                         skb_put(pskb, LL_HEADER_LENGTH);
 179                 }
 180         }
 181 }
 182
 183 /**
 184  * Release a specific channel in the channel list.
 185  *
 186  *  ch          Pointer to channel struct to be released.
 187  */
 188 static void channel_free(struct channel *ch)
 189 {
 190         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 191         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 192         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 193 }
 194
 195 /**
 196  * Remove a specific channel in the channel list.
 197  *
 198  *  ch          Pointer to channel struct to be released.
 199  */
 200 static void channel_remove(struct channel *ch)
 201 {
 202         struct channel **c = &channels;
 203         char chid[CTCM_ID_SIZE+1];
 204         int ok = 0;
 205
 206         if (ch == NULL)
 207                 return;
 208         else
 209                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 210
 211         channel_free(ch);
 212         while (*c) {
 213                 if (*c == ch) {
 214                         *c = ch->next;
 215                         fsm_deltimer(&ch->timer);
 216                         if (IS_MPC(ch))
 217                                 fsm_deltimer(&ch->sweep_timer);
 218
 219                         kfree_fsm(ch->fsm);
 220                         clear_normalized_cda(&ch->ccw[4]);
 221                         if (ch->trans_skb != NULL) {
 222                                 clear_normalized_cda(&ch->ccw[1]);
 223                                 dev_kfree_skb_any(ch->trans_skb);
 224                         }
 225                         if (IS_MPC(ch)) {
 226                                 tasklet_kill(&ch->ch_tasklet);
 227                                 tasklet_kill(&ch->ch_disc_tasklet);
 228                                 kfree(ch->discontact_th);
 229                         }
 230                         kfree(ch->ccw);
 231                         kfree(ch->irb);
 232                         kfree(ch);
 233                         ok = 1;
 234                         break;
 235                 }
 236                 c = &((*c)->next);
 237         }
 238
 239         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 240                         chid, ok ? "OK" : "failed");
 241 }
 242
 243 /**
 244  * Get a specific channel from the channel list.
 245  *
 246  *  type        Type of channel we are interested in.
 247  *  id          Id of channel we are interested in.
 248  *  direction   Direction we want to use this channel for.
 249  *
 250  * returns Pointer to a channel or NULL if no matching channel available.
 251  */
 252 static struct channel *channel_get(enum ctcm_channel_types type,
 253                                         char *id, int direction)
 254 {
 255         struct channel *ch = channels;
 256
 257         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 258                 ch = ch->next;
 259         if (!ch) {
 260                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 261                                 "%s(%d, %s, %d) not found in channel list\n",
 262                                 CTCM_FUNTAIL, type, id, direction);
 263         } else {
 264                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 265                         ch = NULL;
 266                 else {
 267                         ch->flags |= CHANNEL_FLAGS_INUSE;
 268                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 269                         ch->flags |= (direction == CTCM_WRITE)
 270                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 271                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 272                 }
 273         }
 274         return ch;
 275 }
 276
 277 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 278 {
 279         if (!IS_ERR(irb))
 280                 return 0;
 281
 282         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 283                         "irb error %ld on device %s\n",
 284                                 PTR_ERR(irb), dev_name(&cdev->dev));
 285
 286         switch (PTR_ERR(irb)) {
 287         case -EIO:
 288                 dev_err(&cdev->dev,
 289                         "An I/O-error occurred on the CTCM device\n");
 290                 break;
 291         case -ETIMEDOUT:
 292                 dev_err(&cdev->dev,
 293                         "An adapter hardware operation timed out\n");
 294                 break;
 295         default:
 296                 dev_err(&cdev->dev,
 297                         "An error occurred on the adapter hardware\n");
 298         }
 299         return PTR_ERR(irb);
 300 }
 301
 302
 303 /**
 304  * Check sense of a unit check.
 305  *
 306  *  ch          The channel, the sense code belongs to.
 307  *  sense       The sense code to inspect.
 308  */
 309 static void ccw_unit_check(struct channel *ch, __u8 sense)
 310 {
 311         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 312                         "%s(%s): %02x",
 313                                 CTCM_FUNTAIL, ch->id, sense);
 314
 315         if (sense & SNS0_INTERVENTION_REQ) {
 316                 if (sense & 0x01) {
 317                         if (ch->sense_rc != 0x01) {
 318                                 pr_notice(
 319                                         "%s: The communication peer has "
 320                                         "disconnected\n", ch->id);
 321                                 ch->sense_rc = 0x01;
 322                         }
 323                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 324                 } else {
 325                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 326                                 pr_notice(
 327                                         "%s: The remote operating system is "
 328                                         "not available\n", ch->id);
 329                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 330                         }
 331                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 332                 }
 333         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 334                 if (sense & SNS0_BUS_OUT_CHECK) {
 335                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 336                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 337                                         "%s(%s): remote HW error %02x",
 338                                                 CTCM_FUNTAIL, ch->id, sense);
 339                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 340                         }
 341                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 342                 } else {
 343                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 344                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 345                                         "%s(%s): remote read parity error %02x",
 346                                                 CTCM_FUNTAIL, ch->id, sense);
 347                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 348                         }
 349                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 350                 }
 351         } else if (sense & SNS0_BUS_OUT_CHECK) {
 352                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 353                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 354                                 "%s(%s): BUS OUT error %02x",
 355                                         CTCM_FUNTAIL, ch->id, sense);
 356                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 357                 }
 358                 if (sense & 0x04)       /* data-streaming timeout */
 359                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 360                 else                    /* Data-transfer parity error */
 361                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 362         } else if (sense & SNS0_CMD_REJECT) {
 363                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 364                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 365                                 "%s(%s): Command rejected",
 366                                                 CTCM_FUNTAIL, ch->id);
 367                         ch->sense_rc = SNS0_CMD_REJECT;
 368                 }
 369         } else if (sense == 0) {
 370                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 371                         "%s(%s): Unit check ZERO",
 372                                         CTCM_FUNTAIL, ch->id);
 373                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 374         } else {
 375                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 376                         "%s(%s): Unit check code %02x unknown",
 377                                         CTCM_FUNTAIL, ch->id, sense);
 378                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 379         }
 380 }
 381
 382 int ctcm_ch_alloc_buffer(struct channel *ch)
 383 {
 384         clear_normalized_cda(&ch->ccw[1]);
 385         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 386         if (ch->trans_skb == NULL) {
 387                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 388                         "%s(%s): %s trans_skb allocation error",
 389                         CTCM_FUNTAIL, ch->id,
 390                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 391                                 "RX" : "TX");
 392                 return -ENOMEM;
 393         }
 394
 395         ch->ccw[1].count = ch->max_bufsize;
 396         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 397                 dev_kfree_skb(ch->trans_skb);
 398                 ch->trans_skb = NULL;
 399                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 400                         "%s(%s): %s set norm_cda failed",
 401                         CTCM_FUNTAIL, ch->id,
 402                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 403                                 "RX" : "TX");
 404                 return -ENOMEM;
 405         }
 406
 407         ch->ccw[1].count = 0;
 408         ch->trans_skb_data = ch->trans_skb->data;
 409         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 410         return 0;
 411 }
 412
 413 /*
 414  * Interface API for upper network layers
 415  */
 416
 417 /**
 418  * Open an interface.
 419  * Called from generic network layer when ifconfig up is run.
 420  *
 421  *  dev         Pointer to interface struct.
 422  *
 423  * returns 0 on success, -ERRNO on failure. (Never fails.)
 424  */
 425 int ctcm_open(struct net_device *dev)
 426 {
 427         struct ctcm_priv *priv = dev->ml_priv;
 428
 429         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 430         if (!IS_MPC(priv))
 431                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 432         return 0;
 433 }
 434
 435 /**
 436  * Close an interface.
 437  * Called from generic network layer when ifconfig down is run.
 438  *
 439  *  dev         Pointer to interface struct.
 440  *
 441  * returns 0 on success, -ERRNO on failure. (Never fails.)
 442  */
 443 int ctcm_close(struct net_device *dev)
 444 {
 445         struct ctcm_priv *priv = dev->ml_priv;
 446
 447         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 448         if (!IS_MPC(priv))
 449                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 450         return 0;
 451 }
 452
 453
 454 /**
 455  * Transmit a packet.
 456  * This is a helper function for ctcm_tx().
 457  *
 458  *  ch          Channel to be used for sending.
 459  *  skb         Pointer to struct sk_buff of packet to send.
 460  *            The linklevel header has already been set up
 461  *            by ctcm_tx().
 462  *
 463  * returns 0 on success, -ERRNO on failure. (Never fails.)
 464  */
 465 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 466 {
 467         unsigned long saveflags;
 468         struct ll_header header;
 469         int rc = 0;
 470         __u16 block_len;
 471         int ccw_idx;
 472         struct sk_buff *nskb;
 473         unsigned long hi;
 474
 475         /* we need to acquire the lock for testing the state
 476          * otherwise we can have an IRQ changing the state to
 477          * TXIDLE after the test but before acquiring the lock.
 478          */
 479         spin_lock_irqsave(&ch->collect_lock, saveflags);
 480         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 481                 int l = skb->len + LL_HEADER_LENGTH;
 482
 483                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 484                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 485                         return -EBUSY;
 486                 } else {
 487                         refcount_inc(&skb->users);
 488                         header.length = l;
 489                         header.type = be16_to_cpu(skb->protocol);
 490                         header.unused = 0;
 491                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 492                                LL_HEADER_LENGTH);
 493                         skb_queue_tail(&ch->collect_queue, skb);
 494                         ch->collect_len += l;
 495                 }
 496                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 497                                 goto done;
 498         }
 499         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 500         /*
 501          * Protect skb against beeing free'd by upper
 502          * layers.
 503          */
 504         refcount_inc(&skb->users);
 505         ch->prof.txlen += skb->len;
 506         header.length = skb->len + LL_HEADER_LENGTH;
 507         header.type = be16_to_cpu(skb->protocol);
 508         header.unused = 0;
 509         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 510         block_len = skb->len + 2;
 511         *((__u16 *)skb_push(skb, 2)) = block_len;
 512
 513         /*
 514          * IDAL support in CTCM is broken, so we have to
 515          * care about skb's above 2G ourselves.
 516          */
 517         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 518         if (hi) {
 519                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 520                 if (!nskb) {
 521                         refcount_dec(&skb->users);
 522                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 523                         ctcm_clear_busy(ch->netdev);
 524                         return -ENOMEM;
 525                 } else {
 526                         skb_put_data(nskb, skb->data, skb->len);
 527                         refcount_inc(&nskb->users);
 528                         refcount_dec(&skb->users);
 529                         dev_kfree_skb_irq(skb);
 530                         skb = nskb;
 531                 }
 532         }
 533
 534         ch->ccw[4].count = block_len;
 535         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 536                 /*
 537                  * idal allocation failed, try via copying to
 538                  * trans_skb. trans_skb usually has a pre-allocated
 539                  * idal.
 540                  */
 541                 if (ctcm_checkalloc_buffer(ch)) {
 542                         /*
 543                          * Remove our header. It gets added
 544                          * again on retransmit.
 545                          */
 546                         refcount_dec(&skb->users);
 547                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 548                         ctcm_clear_busy(ch->netdev);
 549                         return -ENOMEM;
 550                 }
 551
 552                 skb_reset_tail_pointer(ch->trans_skb);
 553                 ch->trans_skb->len = 0;
 554                 ch->ccw[1].count = skb->len;
 555                 skb_copy_from_linear_data(skb,
 556                                 skb_put(ch->trans_skb, skb->len), skb->len);
 557                 refcount_dec(&skb->users);
 558                 dev_kfree_skb_irq(skb);
 559                 ccw_idx = 0;
 560         } else {
 561                 skb_queue_tail(&ch->io_queue, skb);
 562                 ccw_idx = 3;
 563         }
 564         if (do_debug_ccw)
 565                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 566                                         sizeof(struct ccw1) * 3);
 567         ch->retry = 0;
 568         fsm_newstate(ch->fsm, CTC_STATE_TX);
 569         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 570         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 571         ch->prof.send_stamp = jiffies;
 572         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 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 = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
 627         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 628         header->sw.th_last_seq  = ch->th_seq_num;
 629
 630         netif_trans_update(dev);
 631         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 632
 633         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 634
 635         return;
 636
 637 nomem:
 638         grp->in_sweep = 0;
 639         ctcm_clear_busy(dev);
 640         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 641
 642         return;
 643 }
 644
 645 /*
 646  * MPC mode version of transmit_skb
 647  */
 648 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 649 {
 650         struct pdu *p_header;
 651         struct net_device *dev = ch->netdev;
 652         struct ctcm_priv *priv = dev->ml_priv;
 653         struct mpc_group *grp = priv->mpcg;
 654         struct th_header *header;
 655         struct sk_buff *nskb;
 656         int rc = 0;
 657         int ccw_idx;
 658         unsigned long hi;
 659         unsigned long saveflags = 0;    /* avoids compiler warning */
 660
 661         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 662                         __func__, dev->name, smp_processor_id(), ch,
 663                                         ch->id, fsm_getstate_str(ch->fsm));
 664
 665         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 666                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 667                 refcount_inc(&skb->users);
 668
 669                 p_header = skb_push(skb, PDU_HEADER_LENGTH);
 670                 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
 671                 p_header->pdu_proto = 0x01;
 672                 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 673                         p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
 674                 } else {
 675                         p_header->pdu_flag = PDU_FIRST;
 676                 }
 677                 p_header->pdu_seq = 0;
 678
 679                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 680                                 "pdu header and data for up to 32 bytes:\n",
 681                                 __func__, dev->name, skb->len);
 682                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 683
 684                 skb_queue_tail(&ch->collect_queue, skb);
 685                 ch->collect_len += skb->len;
 686
 687                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 688                         goto done;
 689         }
 690
 691         /*
 692          * Protect skb against beeing free'd by upper
 693          * layers.
 694          */
 695         refcount_inc(&skb->users);
 696
 697         /*
 698          * IDAL support in CTCM is broken, so we have to
 699          * care about skb's above 2G ourselves.
 700          */
 701         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 702         if (hi) {
 703                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 704                 if (!nskb) {
 705                         goto nomem_exit;
 706                 } else {
 707                         skb_put_data(nskb, skb->data, skb->len);
 708                         refcount_inc(&nskb->users);
 709                         refcount_dec(&skb->users);
 710                         dev_kfree_skb_irq(skb);
 711                         skb = nskb;
 712                 }
 713         }
 714
 715         p_header = skb_push(skb, PDU_HEADER_LENGTH);
 716         p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
 717         p_header->pdu_proto = 0x01;
 718         p_header->pdu_seq = 0;
 719         if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 720                 p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
 721         } else {
 722                 p_header->pdu_flag = PDU_FIRST;
 723         }
 724
 725         if (ch->collect_len > 0) {
 726                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 727                 skb_queue_tail(&ch->collect_queue, skb);
 728                 ch->collect_len += skb->len;
 729                 skb = skb_dequeue(&ch->collect_queue);
 730                 ch->collect_len -= skb->len;
 731                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 732         }
 733
 734         p_header = (struct pdu *)skb->data;
 735         p_header->pdu_flag |= PDU_LAST;
 736
 737         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 738
 739         /* put the TH on the packet */
 740         header = skb_push(skb, TH_HEADER_LENGTH);
 741         memset(header, 0, TH_HEADER_LENGTH);
 742
 743         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 744         ch->th_seq_num++;
 745         header->th_seq_num = ch->th_seq_num;
 746
 747         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 748                        __func__, dev->name, ch->th_seq_num);
 749
 750         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 751                         "up to 32 bytes sent to vtam:\n",
 752                                 __func__, dev->name, skb->len);
 753         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 754
 755         ch->ccw[4].count = skb->len;
 756         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 757                 /*
 758                  * idal allocation failed, try via copying to trans_skb.
 759                  * trans_skb usually has a pre-allocated idal.
 760                  */
 761                 if (ctcm_checkalloc_buffer(ch)) {
 762                         /*
 763                          * Remove our header.
 764                          * It gets added again on retransmit.
 765                          */
 766                                 goto nomem_exit;
 767                 }
 768
 769                 skb_reset_tail_pointer(ch->trans_skb);
 770                 ch->trans_skb->len = 0;
 771                 ch->ccw[1].count = skb->len;
 772                 skb_put_data(ch->trans_skb, skb->data, skb->len);
 773                 refcount_dec(&skb->users);
 774                 dev_kfree_skb_irq(skb);
 775                 ccw_idx = 0;
 776                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 777                                 "up to 32 bytes sent to vtam:\n",
 778                                 __func__, dev->name, ch->trans_skb->len);
 779                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 780                                 min_t(int, 32, ch->trans_skb->len));
 781         } else {
 782                 skb_queue_tail(&ch->io_queue, skb);
 783                 ccw_idx = 3;
 784         }
 785         ch->retry = 0;
 786         fsm_newstate(ch->fsm, CTC_STATE_TX);
 787         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 788
 789         if (do_debug_ccw)
 790                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 791                                         sizeof(struct ccw1) * 3);
 792
 793         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 794         ch->prof.send_stamp = jiffies;
 795         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
 796         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 797         if (ccw_idx == 3)
 798                 ch->prof.doios_single++;
 799         if (rc != 0) {
 800                 fsm_deltimer(&ch->timer);
 801                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 802                 if (ccw_idx == 3)
 803                         skb_dequeue_tail(&ch->io_queue);
 804         } else if (ccw_idx == 0) {
 805                 priv->stats.tx_packets++;
 806                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 807         }
 808         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 809                 ctcmpc_send_sweep_req(ch);
 810
 811         goto done;
 812 nomem_exit:
 813         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 814                         "%s(%s): MEMORY allocation ERROR\n",
 815                         CTCM_FUNTAIL, ch->id);
 816         rc = -ENOMEM;
 817         refcount_dec(&skb->users);
 818         dev_kfree_skb_any(skb);
 819         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 820 done:
 821         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 822         return rc;
 823 }
 824
 825 /**
 826  * Start transmission of a packet.
 827  * Called from generic network device layer.
 828  *
 829  *  skb         Pointer to buffer containing the packet.
 830  *  dev         Pointer to interface struct.
 831  *
 832  * returns 0 if packet consumed, !0 if packet rejected.
 833  *         Note: If we return !0, then the packet is free'd by
 834  *               the generic network layer.
 835  */
 836 /* first merge version - leaving both functions separated */
 837 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 838 {
 839         struct ctcm_priv *priv = dev->ml_priv;
 840
 841         if (skb == NULL) {
 842                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 843                                 "%s(%s): NULL sk_buff passed",
 844                                         CTCM_FUNTAIL, dev->name);
 845                 priv->stats.tx_dropped++;
 846                 return NETDEV_TX_OK;
 847         }
 848         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 849                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 850                         "%s(%s): Got sk_buff with head room < %ld bytes",
 851                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 852                 dev_kfree_skb(skb);
 853                 priv->stats.tx_dropped++;
 854                 return NETDEV_TX_OK;
 855         }
 856
 857         /*
 858          * If channels are not running, try to restart them
 859          * and throw away packet.
 860          */
 861         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 862                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 863                 dev_kfree_skb(skb);
 864                 priv->stats.tx_dropped++;
 865                 priv->stats.tx_errors++;
 866                 priv->stats.tx_carrier_errors++;
 867                 return NETDEV_TX_OK;
 868         }
 869
 870         if (ctcm_test_and_set_busy(dev))
 871                 return NETDEV_TX_BUSY;
 872
 873         netif_trans_update(dev);
 874         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 875                 return NETDEV_TX_BUSY;
 876         return NETDEV_TX_OK;
 877 }
 878
 879 /* unmerged MPC variant of ctcm_tx */
 880 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 881 {
 882         int len = 0;
 883         struct ctcm_priv *priv = dev->ml_priv;
 884         struct mpc_group *grp  = priv->mpcg;
 885         struct sk_buff *newskb = NULL;
 886
 887         /*
 888          * Some sanity checks ...
 889          */
 890         if (skb == NULL) {
 891                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 892                         "%s(%s): NULL sk_buff passed",
 893                                         CTCM_FUNTAIL, dev->name);
 894                 priv->stats.tx_dropped++;
 895                                         goto done;
 896         }
 897         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 898                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 899                         "%s(%s): Got sk_buff with head room < %ld bytes",
 900                         CTCM_FUNTAIL, dev->name,
 901                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 902
 903                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 904
 905                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 906                 newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
 907
 908                 if (!newskb) {
 909                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 910                                 "%s: %s: __dev_alloc_skb failed",
 911                                                 __func__, dev->name);
 912
 913                         dev_kfree_skb_any(skb);
 914                         priv->stats.tx_dropped++;
 915                         priv->stats.tx_errors++;
 916                         priv->stats.tx_carrier_errors++;
 917                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 918                                         goto done;
 919                 }
 920                 newskb->protocol = skb->protocol;
 921                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 922                 skb_put_data(newskb, skb->data, skb->len);
 923                 dev_kfree_skb_any(skb);
 924                 skb = newskb;
 925         }
 926
 927         /*
 928          * If channels are not running,
 929          * notify anybody about a link failure and throw
 930          * away packet.
 931          */
 932         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 933            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 934                 dev_kfree_skb_any(skb);
 935                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 936                         "%s(%s): inactive MPCGROUP - dropped",
 937                                         CTCM_FUNTAIL, dev->name);
 938                 priv->stats.tx_dropped++;
 939                 priv->stats.tx_errors++;
 940                 priv->stats.tx_carrier_errors++;
 941                                         goto done;
 942         }
 943
 944         if (ctcm_test_and_set_busy(dev)) {
 945                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 946                         "%s(%s): device busy - dropped",
 947                                         CTCM_FUNTAIL, dev->name);
 948                 dev_kfree_skb_any(skb);
 949                 priv->stats.tx_dropped++;
 950                 priv->stats.tx_errors++;
 951                 priv->stats.tx_carrier_errors++;
 952                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 953                                         goto done;
 954         }
 955
 956         netif_trans_update(dev);
 957         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
 958                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 959                         "%s(%s): device error - dropped",
 960                                         CTCM_FUNTAIL, dev->name);
 961                 dev_kfree_skb_any(skb);
 962                 priv->stats.tx_dropped++;
 963                 priv->stats.tx_errors++;
 964                 priv->stats.tx_carrier_errors++;
 965                 ctcm_clear_busy(dev);
 966                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 967                                         goto done;
 968         }
 969         ctcm_clear_busy(dev);
 970 done:
 971         if (do_debug)
 972                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
 973
 974         return NETDEV_TX_OK;    /* handle freeing of skb here */
 975 }
 976
 977
 978 /**
 979  * Sets MTU of an interface.
 980  *
 981  *  dev         Pointer to interface struct.
 982  *  new_mtu     The new MTU to use for this interface.
 983  *
 984  * returns 0 on success, -EINVAL if MTU is out of valid range.
 985  *         (valid range is 576 .. 65527). If VM is on the
 986  *         remote side, maximum MTU is 32760, however this is
 987  *         not checked here.
 988  */
 989 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
 990 {
 991         struct ctcm_priv *priv;
 992         int max_bufsize;
 993
 994         priv = dev->ml_priv;
 995         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
 996
 997         if (IS_MPC(priv)) {
 998                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
 999                         return -EINVAL;
1000                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1001         } else {
1002                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1003                         return -EINVAL;
1004                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1005         }
1006         dev->mtu = new_mtu;
1007         return 0;
1008 }
1009
1010 /**
1011  * Returns interface statistics of a device.
1012  *
1013  *  dev         Pointer to interface struct.
1014  *
1015  * returns Pointer to stats struct of this interface.
1016  */
1017 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1018 {
1019         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1020 }
1021
1022 static void ctcm_free_netdevice(struct net_device *dev)
1023 {
1024         struct ctcm_priv *priv;
1025         struct mpc_group *grp;
1026
1027         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1028                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1029         priv = dev->ml_priv;
1030         if (priv) {
1031                 grp = priv->mpcg;
1032                 if (grp) {
1033                         if (grp->fsm)
1034                                 kfree_fsm(grp->fsm);
1035                         dev_kfree_skb(grp->xid_skb);
1036                         dev_kfree_skb(grp->rcvd_xid_skb);
1037                         tasklet_kill(&grp->mpc_tasklet2);
1038                         kfree(grp);
1039                         priv->mpcg = NULL;
1040                 }
1041                 if (priv->fsm) {
1042                         kfree_fsm(priv->fsm);
1043                         priv->fsm = NULL;
1044                 }
1045                 kfree(priv->xid);
1046                 priv->xid = NULL;
1047         /*
1048          * Note: kfree(priv); is done in "opposite" function of
1049          * allocator function probe_device which is remove_device.
1050          */
1051         }
1052 #ifdef MODULE
1053         free_netdev(dev);
1054 #endif
1055 }
1056
1057 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1058
1059 static const struct net_device_ops ctcm_netdev_ops = {
1060         .ndo_open               = ctcm_open,
1061         .ndo_stop               = ctcm_close,
1062         .ndo_get_stats          = ctcm_stats,
1063         .ndo_change_mtu         = ctcm_change_mtu,
1064         .ndo_start_xmit         = ctcm_tx,
1065 };
1066
1067 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1068         .ndo_open               = ctcm_open,
1069         .ndo_stop               = ctcm_close,
1070         .ndo_get_stats          = ctcm_stats,
1071         .ndo_change_mtu         = ctcm_change_mtu,
1072         .ndo_start_xmit         = ctcmpc_tx,
1073 };
1074
1075 static void ctcm_dev_setup(struct net_device *dev)
1076 {
1077         dev->type = ARPHRD_SLIP;
1078         dev->tx_queue_len = 100;
1079         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1080         dev->min_mtu = 576;
1081         dev->max_mtu = 65527;
1082 }
1083
1084 /*
1085  * Initialize everything of the net device except the name and the
1086  * channel structs.
1087  */
1088 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1089 {
1090         struct net_device *dev;
1091         struct mpc_group *grp;
1092         if (!priv)
1093                 return NULL;
1094
1095         if (IS_MPC(priv))
1096                 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1097                                    ctcm_dev_setup);
1098         else
1099                 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1100                                    ctcm_dev_setup);
1101
1102         if (!dev) {
1103                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1104                         "%s: MEMORY allocation ERROR",
1105                         CTCM_FUNTAIL);
1106                 return NULL;
1107         }
1108         dev->ml_priv = priv;
1109         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1110                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1111                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1112         if (priv->fsm == NULL) {
1113                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1114                 free_netdev(dev);
1115                 return NULL;
1116         }
1117         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1118         fsm_settimer(priv->fsm, &priv->restart_timer);
1119
1120         if (IS_MPC(priv)) {
1121                 /*  MPC Group Initializations  */
1122                 grp = ctcmpc_init_mpc_group(priv);
1123                 if (grp == NULL) {
1124                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1125                         free_netdev(dev);
1126                         return NULL;
1127                 }
1128                 tasklet_init(&grp->mpc_tasklet2,
1129                                 mpc_group_ready, (unsigned long)dev);
1130                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1131                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1132
1133                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1134                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1135                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1136         } else {
1137                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1138                 dev->netdev_ops = &ctcm_netdev_ops;
1139                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1140         }
1141
1142         CTCMY_DBF_DEV(SETUP, dev, "finished");
1143
1144         return dev;
1145 }
1146
1147 /**
1148  * Main IRQ handler.
1149  *
1150  *  cdev        The ccw_device the interrupt is for.
1151  *  intparm     interruption parameter.
1152  *  irb         interruption response block.
1153  */
1154 static void ctcm_irq_handler(struct ccw_device *cdev,
1155                                 unsigned long intparm, struct irb *irb)
1156 {
1157         struct channel          *ch;
1158         struct net_device       *dev;
1159         struct ctcm_priv        *priv;
1160         struct ccwgroup_device  *cgdev;
1161         int cstat;
1162         int dstat;
1163
1164         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1165                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1166
1167         if (ctcm_check_irb_error(cdev, irb))
1168                 return;
1169
1170         cgdev = dev_get_drvdata(&cdev->dev);
1171
1172         cstat = irb->scsw.cmd.cstat;
1173         dstat = irb->scsw.cmd.dstat;
1174
1175         /* Check for unsolicited interrupts. */
1176         if (cgdev == NULL) {
1177                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1178                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1179                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1180                 dev_warn(&cdev->dev,
1181                         "The adapter received a non-specific IRQ\n");
1182                 return;
1183         }
1184
1185         priv = dev_get_drvdata(&cgdev->dev);
1186
1187         /* Try to extract channel from driver data. */
1188         if (priv->channel[CTCM_READ]->cdev == cdev)
1189                 ch = priv->channel[CTCM_READ];
1190         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1191                 ch = priv->channel[CTCM_WRITE];
1192         else {
1193                 dev_err(&cdev->dev,
1194                         "%s: Internal error: Can't determine channel for "
1195                         "interrupt device %s\n",
1196                         __func__, dev_name(&cdev->dev));
1197                         /* Explain: inconsistent internal structures */
1198                 return;
1199         }
1200
1201         dev = ch->netdev;
1202         if (dev == NULL) {
1203                 dev_err(&cdev->dev,
1204                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1205                         __func__, ch);
1206                         /* Explain: inconsistent internal structures */
1207                 return;
1208         }
1209
1210         /* Copy interruption response block. */
1211         memcpy(ch->irb, irb, sizeof(struct irb));
1212
1213         /* Issue error message and return on subchannel error code */
1214         if (irb->scsw.cmd.cstat) {
1215                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1216                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1217                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1218                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1219                 dev_warn(&cdev->dev,
1220                                 "A check occurred on the subchannel\n");
1221                 return;
1222         }
1223
1224         /* Check the reason-code of a unit check */
1225         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1226                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1227                         /* print it only once */
1228                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1229                                 "%s(%s): sense=%02x, ds=%02x",
1230                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1231                 ccw_unit_check(ch, irb->ecw[0]);
1232                 return;
1233         }
1234         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1235                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1236                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1237                 else
1238                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1239                 return;
1240         }
1241         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1242                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1243                 return;
1244         }
1245         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1246             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1247             (irb->scsw.cmd.stctl ==
1248              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1249                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1250         else
1251                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1252
1253 }
1254
1255 static const struct device_type ctcm_devtype = {
1256         .name = "ctcm",
1257         .groups = ctcm_attr_groups,
1258 };
1259
1260 /**
1261  * Add ctcm specific attributes.
1262  * Add ctcm private data.
1263  *
1264  *  cgdev       pointer to ccwgroup_device just added
1265  *
1266  * returns 0 on success, !0 on failure.
1267  */
1268 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1269 {
1270         struct ctcm_priv *priv;
1271
1272         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1273                         "%s %p",
1274                         __func__, cgdev);
1275
1276         if (!get_device(&cgdev->dev))
1277                 return -ENODEV;
1278
1279         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1280         if (!priv) {
1281                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1282                         "%s: memory allocation failure",
1283                         CTCM_FUNTAIL);
1284                 put_device(&cgdev->dev);
1285                 return -ENOMEM;
1286         }
1287         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1288         cgdev->cdev[0]->handler = ctcm_irq_handler;
1289         cgdev->cdev[1]->handler = ctcm_irq_handler;
1290         dev_set_drvdata(&cgdev->dev, priv);
1291         cgdev->dev.type = &ctcm_devtype;
1292
1293         return 0;
1294 }
1295
1296 /**
1297  * Add a new channel to the list of channels.
1298  * Keeps the channel list sorted.
1299  *
1300  *  cdev        The ccw_device to be added.
1301  *  type        The type class of the new channel.
1302  *  priv        Points to the private data of the ccwgroup_device.
1303  *
1304  * returns 0 on success, !0 on error.
1305  */
1306 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1307                                 struct ctcm_priv *priv)
1308 {
1309         struct channel **c = &channels;
1310         struct channel *ch;
1311         int ccw_num;
1312         int rc = 0;
1313
1314         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1315                 "%s(%s), type %d, proto %d",
1316                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1317
1318         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1319         if (ch == NULL)
1320                 return -ENOMEM;
1321
1322         ch->protocol = priv->protocol;
1323         if (IS_MPC(priv)) {
1324                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL);
1325                 if (ch->discontact_th == NULL)
1326                                         goto nomem_return;
1327
1328                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1329                 tasklet_init(&ch->ch_disc_tasklet,
1330                         mpc_action_send_discontact, (unsigned long)ch);
1331
1332                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1333                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1334                 ccw_num = 17;
1335         } else
1336                 ccw_num = 8;
1337
1338         ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1339         if (ch->ccw == NULL)
1340                                         goto nomem_return;
1341
1342         ch->cdev = cdev;
1343         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1344         ch->type = type;
1345
1346         /**
1347          * "static" ccws are used in the following way:
1348          *
1349          * ccw[0..2] (Channel program for generic I/O):
1350          *           0: prepare
1351          *           1: read or write (depending on direction) with fixed
1352          *              buffer (idal allocated once when buffer is allocated)
1353          *           2: nop
1354          * ccw[3..5] (Channel program for direct write of packets)
1355          *           3: prepare
1356          *           4: write (idal allocated on every write).
1357          *           5: nop
1358          * ccw[6..7] (Channel program for initial channel setup):
1359          *           6: set extended mode
1360          *           7: nop
1361          *
1362          * ch->ccw[0..5] are initialized in ch_action_start because
1363          * the channel's direction is yet unknown here.
1364          *
1365          * ccws used for xid2 negotiations
1366          *  ch-ccw[8-14] need to be used for the XID exchange either
1367          *    X side XID2 Processing
1368          *       8:  write control
1369          *       9:  write th
1370          *           10: write XID
1371          *           11: read th from secondary
1372          *           12: read XID   from secondary
1373          *           13: read 4 byte ID
1374          *           14: nop
1375          *    Y side XID Processing
1376          *           8:  sense
1377          *       9:  read th
1378          *           10: read XID
1379          *           11: write th
1380          *           12: write XID
1381          *           13: write 4 byte ID
1382          *           14: nop
1383          *
1384          *  ccws used for double noop due to VM timing issues
1385          *  which result in unrecoverable Busy on channel
1386          *       15: nop
1387          *       16: nop
1388          */
1389         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1390         ch->ccw[6].flags        = CCW_FLAG_SLI;
1391
1392         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1393         ch->ccw[7].flags        = CCW_FLAG_SLI;
1394
1395         if (IS_MPC(priv)) {
1396                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1397                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1398                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1399                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1400
1401                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1402                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1403
1404                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1405                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1406                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1407                                 mpc_ch_fsm_len, GFP_KERNEL);
1408         } else {
1409                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1410                                 ctc_ch_event_names, CTC_NR_STATES,
1411                                 CTC_NR_EVENTS, ch_fsm,
1412                                 ch_fsm_len, GFP_KERNEL);
1413         }
1414         if (ch->fsm == NULL)
1415                                 goto nomem_return;
1416
1417         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1418
1419         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1420         if (ch->irb == NULL)
1421                                 goto nomem_return;
1422
1423         while (*c && ctcm_less_than((*c)->id, ch->id))
1424                 c = &(*c)->next;
1425
1426         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1427                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1428                                 "%s (%s) already in list, using old entry",
1429                                 __func__, (*c)->id);
1430
1431                                 goto free_return;
1432         }
1433
1434         spin_lock_init(&ch->collect_lock);
1435
1436         fsm_settimer(ch->fsm, &ch->timer);
1437         skb_queue_head_init(&ch->io_queue);
1438         skb_queue_head_init(&ch->collect_queue);
1439
1440         if (IS_MPC(priv)) {
1441                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1442                 skb_queue_head_init(&ch->sweep_queue);
1443         }
1444         ch->next = *c;
1445         *c = ch;
1446         return 0;
1447
1448 nomem_return:
1449         rc = -ENOMEM;
1450
1451 free_return:    /* note that all channel pointers are 0 or valid */
1452         kfree(ch->ccw);
1453         kfree(ch->discontact_th);
1454         kfree_fsm(ch->fsm);
1455         kfree(ch->irb);
1456         kfree(ch);
1457         return rc;
1458 }
1459
1460 /*
1461  * Return type of a detected device.
1462  */
1463 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1464 {
1465         enum ctcm_channel_types type;
1466         type = (enum ctcm_channel_types)id->driver_info;
1467
1468         if (type == ctcm_channel_type_ficon)
1469                 type = ctcm_channel_type_escon;
1470
1471         return type;
1472 }
1473
1474 /**
1475  *
1476  * Setup an interface.
1477  *
1478  *  cgdev       Device to be setup.
1479  *
1480  * returns 0 on success, !0 on failure.
1481  */
1482 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1483 {
1484         char read_id[CTCM_ID_SIZE];
1485         char write_id[CTCM_ID_SIZE];
1486         int direction;
1487         enum ctcm_channel_types type;
1488         struct ctcm_priv *priv;
1489         struct net_device *dev;
1490         struct ccw_device *cdev0;
1491         struct ccw_device *cdev1;
1492         struct channel *readc;
1493         struct channel *writec;
1494         int ret;
1495         int result;
1496
1497         priv = dev_get_drvdata(&cgdev->dev);
1498         if (!priv) {
1499                 result = -ENODEV;
1500                 goto out_err_result;
1501         }
1502
1503         cdev0 = cgdev->cdev[0];
1504         cdev1 = cgdev->cdev[1];
1505
1506         type = get_channel_type(&cdev0->id);
1507
1508         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1509         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1510
1511         ret = add_channel(cdev0, type, priv);
1512         if (ret) {
1513                 result = ret;
1514                 goto out_err_result;
1515         }
1516         ret = add_channel(cdev1, type, priv);
1517         if (ret) {
1518                 result = ret;
1519                 goto out_remove_channel1;
1520         }
1521
1522         ret = ccw_device_set_online(cdev0);
1523         if (ret != 0) {
1524                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1525                         "%s(%s) set_online rc=%d",
1526                                 CTCM_FUNTAIL, read_id, ret);
1527                 result = -EIO;
1528                 goto out_remove_channel2;
1529         }
1530
1531         ret = ccw_device_set_online(cdev1);
1532         if (ret != 0) {
1533                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1534                         "%s(%s) set_online rc=%d",
1535                                 CTCM_FUNTAIL, write_id, ret);
1536
1537                 result = -EIO;
1538                 goto out_ccw1;
1539         }
1540
1541         dev = ctcm_init_netdevice(priv);
1542         if (dev == NULL) {
1543                 result = -ENODEV;
1544                 goto out_ccw2;
1545         }
1546
1547         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1548                 priv->channel[direction] =
1549                         channel_get(type, direction == CTCM_READ ?
1550                                 read_id : write_id, direction);
1551                 if (priv->channel[direction] == NULL) {
1552                         if (direction == CTCM_WRITE)
1553                                 channel_free(priv->channel[CTCM_READ]);
1554                         result = -ENODEV;
1555                         goto out_dev;
1556                 }
1557                 priv->channel[direction]->netdev = dev;
1558                 priv->channel[direction]->protocol = priv->protocol;
1559                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1560         }
1561         /* sysfs magic */
1562         SET_NETDEV_DEV(dev, &cgdev->dev);
1563
1564         if (register_netdev(dev)) {
1565                 result = -ENODEV;
1566                 goto out_dev;
1567         }
1568
1569         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1570
1571         dev_info(&dev->dev,
1572                 "setup OK : r/w = %s/%s, protocol : %d\n",
1573                         priv->channel[CTCM_READ]->id,
1574                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1575
1576         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1577                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1578                         priv->channel[CTCM_READ]->id,
1579                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1580
1581         return 0;
1582 out_dev:
1583         ctcm_free_netdevice(dev);
1584 out_ccw2:
1585         ccw_device_set_offline(cgdev->cdev[1]);
1586 out_ccw1:
1587         ccw_device_set_offline(cgdev->cdev[0]);
1588 out_remove_channel2:
1589         readc = channel_get(type, read_id, CTCM_READ);
1590         channel_remove(readc);
1591 out_remove_channel1:
1592         writec = channel_get(type, write_id, CTCM_WRITE);
1593         channel_remove(writec);
1594 out_err_result:
1595         return result;
1596 }
1597
1598 /**
1599  * Shutdown an interface.
1600  *
1601  *  cgdev       Device to be shut down.
1602  *
1603  * returns 0 on success, !0 on failure.
1604  */
1605 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1606 {
1607         struct ctcm_priv *priv;
1608         struct net_device *dev;
1609
1610         priv = dev_get_drvdata(&cgdev->dev);
1611         if (!priv)
1612                 return -ENODEV;
1613
1614         if (priv->channel[CTCM_READ]) {
1615                 dev = priv->channel[CTCM_READ]->netdev;
1616                 CTCM_DBF_DEV(SETUP, dev, "");
1617                 /* Close the device */
1618                 ctcm_close(dev);
1619                 dev->flags &= ~IFF_RUNNING;
1620                 channel_free(priv->channel[CTCM_READ]);
1621         } else
1622                 dev = NULL;
1623
1624         if (priv->channel[CTCM_WRITE])
1625                 channel_free(priv->channel[CTCM_WRITE]);
1626
1627         if (dev) {
1628                 unregister_netdev(dev);
1629                 ctcm_free_netdevice(dev);
1630         }
1631
1632         if (priv->fsm)
1633                 kfree_fsm(priv->fsm);
1634
1635         ccw_device_set_offline(cgdev->cdev[1]);
1636         ccw_device_set_offline(cgdev->cdev[0]);
1637         channel_remove(priv->channel[CTCM_READ]);
1638         channel_remove(priv->channel[CTCM_WRITE]);
1639         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1640
1641         return 0;
1642
1643 }
1644
1645
1646 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1647 {
1648         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1649
1650         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1651                         "removing device %p, proto : %d",
1652                         cgdev, priv->protocol);
1653
1654         if (cgdev->state == CCWGROUP_ONLINE)
1655                 ctcm_shutdown_device(cgdev);
1656         dev_set_drvdata(&cgdev->dev, NULL);
1657         kfree(priv);
1658         put_device(&cgdev->dev);
1659 }
1660
1661 static struct ccw_device_id ctcm_ids[] = {
1662         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1663         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1664         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1665         {},
1666 };
1667 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1668
1669 static struct ccw_driver ctcm_ccw_driver = {
1670         .driver = {
1671                 .owner  = THIS_MODULE,
1672                 .name   = "ctcm",
1673         },
1674         .ids    = ctcm_ids,
1675         .probe  = ccwgroup_probe_ccwdev,
1676         .remove = ccwgroup_remove_ccwdev,
1677         .int_class = IRQIO_CTC,
1678 };
1679
1680 static struct ccwgroup_driver ctcm_group_driver = {
1681         .driver = {
1682                 .owner  = THIS_MODULE,
1683                 .name   = CTC_DRIVER_NAME,
1684         },
1685         .ccw_driver  = &ctcm_ccw_driver,
1686         .setup       = ctcm_probe_device,
1687         .remove      = ctcm_remove_device,
1688         .set_online  = ctcm_new_device,
1689         .set_offline = ctcm_shutdown_device,
1690 };
1691
1692 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1693                            size_t count)
1694 {
1695         int err;
1696
1697         err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1698         return err ? err : count;
1699 }
1700 static DRIVER_ATTR_WO(group);
1701
1702 static struct attribute *ctcm_drv_attrs[] = {
1703         &driver_attr_group.attr,
1704         NULL,
1705 };
1706 static struct attribute_group ctcm_drv_attr_group = {
1707         .attrs = ctcm_drv_attrs,
1708 };
1709 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1710         &ctcm_drv_attr_group,
1711         NULL,
1712 };
1713
1714 /*
1715  * Module related routines
1716  */
1717
1718 /*
1719  * Prepare to be unloaded. Free IRQ's and release all resources.
1720  * This is called just before this module is unloaded. It is
1721  * not called, if the usage count is !0, so we don't need to check
1722  * for that.
1723  */
1724 static void __exit ctcm_exit(void)
1725 {
1726         ccwgroup_driver_unregister(&ctcm_group_driver);
1727         ccw_driver_unregister(&ctcm_ccw_driver);
1728         root_device_unregister(ctcm_root_dev);
1729         ctcm_unregister_dbf_views();
1730         pr_info("CTCM driver unloaded\n");
1731 }
1732
1733 /*
1734  * Print Banner.
1735  */
1736 static void print_banner(void)
1737 {
1738         pr_info("CTCM driver initialized\n");
1739 }
1740
1741 /**
1742  * Initialize module.
1743  * This is called just after the module is loaded.
1744  *
1745  * returns 0 on success, !0 on error.
1746  */
1747 static int __init ctcm_init(void)
1748 {
1749         int ret;
1750
1751         channels = NULL;
1752
1753         ret = ctcm_register_dbf_views();
1754         if (ret)
1755                 goto out_err;
1756         ctcm_root_dev = root_device_register("ctcm");
1757         ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1758         if (ret)
1759                 goto register_err;
1760         ret = ccw_driver_register(&ctcm_ccw_driver);
1761         if (ret)
1762                 goto ccw_err;
1763         ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1764         ret = ccwgroup_driver_register(&ctcm_group_driver);
1765         if (ret)
1766                 goto ccwgroup_err;
1767         print_banner();
1768         return 0;
1769
1770 ccwgroup_err:
1771         ccw_driver_unregister(&ctcm_ccw_driver);
1772 ccw_err:
1773         root_device_unregister(ctcm_root_dev);
1774 register_err:
1775         ctcm_unregister_dbf_views();
1776 out_err:
1777         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1778                 __func__, ret);
1779         return ret;
1780 }
1781
1782 module_init(ctcm_init);
1783 module_exit(ctcm_exit);
1784
1785 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1786 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1787 MODULE_LICENSE("GPL");
1788