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 = 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         skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 642
 643         kfree(header);
 644
 645         netif_trans_update(dev);
 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
 676         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 677                         __func__, dev->name, smp_processor_id(), ch,
 678                                         ch->id, fsm_getstate_str(ch->fsm));
 679
 680         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 681                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 682                 refcount_inc(&skb->users);
 683                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 684
 685                 if (!p_header) {
 686                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 687                                 goto nomem_exit;
 688                 }
 689
 690                 p_header->pdu_offset = skb->len;
 691                 p_header->pdu_proto = 0x01;
 692                 p_header->pdu_flag = 0x00;
 693                 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 694                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 695                 } else {
 696                         p_header->pdu_flag |= PDU_FIRST;
 697                 }
 698                 p_header->pdu_seq = 0;
 699                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 700                        PDU_HEADER_LENGTH);
 701
 702                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 703                                 "pdu header and data for up to 32 bytes:\n",
 704                                 __func__, dev->name, skb->len);
 705                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 706
 707                 skb_queue_tail(&ch->collect_queue, skb);
 708                 ch->collect_len += skb->len;
 709                 kfree(p_header);
 710
 711                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 712                         goto done;
 713         }
 714
 715         /*
 716          * Protect skb against beeing free'd by upper
 717          * layers.
 718          */
 719         refcount_inc(&skb->users);
 720
 721         /*
 722          * IDAL support in CTCM is broken, so we have to
 723          * care about skb's above 2G ourselves.
 724          */
 725         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 726         if (hi) {
 727                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 728                 if (!nskb) {
 729                         goto nomem_exit;
 730                 } else {
 731                         skb_put_data(nskb, skb->data, skb->len);
 732                         refcount_inc(&nskb->users);
 733                         refcount_dec(&skb->users);
 734                         dev_kfree_skb_irq(skb);
 735                         skb = nskb;
 736                 }
 737         }
 738
 739         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 740
 741         if (!p_header)
 742                 goto nomem_exit;
 743
 744         p_header->pdu_offset = skb->len;
 745         p_header->pdu_proto = 0x01;
 746         p_header->pdu_flag = 0x00;
 747         p_header->pdu_seq = 0;
 748         if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 749                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 750         } else {
 751                 p_header->pdu_flag |= PDU_FIRST;
 752         }
 753         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 754
 755         kfree(p_header);
 756
 757         if (ch->collect_len > 0) {
 758                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 759                 skb_queue_tail(&ch->collect_queue, skb);
 760                 ch->collect_len += skb->len;
 761                 skb = skb_dequeue(&ch->collect_queue);
 762                 ch->collect_len -= skb->len;
 763                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 764         }
 765
 766         p_header = (struct pdu *)skb->data;
 767         p_header->pdu_flag |= PDU_LAST;
 768
 769         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 770
 771         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 772         if (!header)
 773                 goto nomem_exit;
 774
 775         header->th_seg = 0x00;
 776         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 777         header->th_blk_flag = 0x00;
 778         header->th_is_xid = 0x00;          /* Just data here */
 779         ch->th_seq_num++;
 780         header->th_seq_num = ch->th_seq_num;
 781
 782         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 783                        __func__, dev->name, ch->th_seq_num);
 784
 785         /* put the TH on the packet */
 786         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 787
 788         kfree(header);
 789
 790         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 791                         "up to 32 bytes sent to vtam:\n",
 792                                 __func__, dev->name, skb->len);
 793         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 794
 795         ch->ccw[4].count = skb->len;
 796         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 797                 /*
 798                  * idal allocation failed, try via copying to trans_skb.
 799                  * trans_skb usually has a pre-allocated idal.
 800                  */
 801                 if (ctcm_checkalloc_buffer(ch)) {
 802                         /*
 803                          * Remove our header.
 804                          * It gets added again on retransmit.
 805                          */
 806                                 goto nomem_exit;
 807                 }
 808
 809                 skb_reset_tail_pointer(ch->trans_skb);
 810                 ch->trans_skb->len = 0;
 811                 ch->ccw[1].count = skb->len;
 812                 skb_put_data(ch->trans_skb, skb->data, skb->len);
 813                 refcount_dec(&skb->users);
 814                 dev_kfree_skb_irq(skb);
 815                 ccw_idx = 0;
 816                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 817                                 "up to 32 bytes sent to vtam:\n",
 818                                 __func__, dev->name, ch->trans_skb->len);
 819                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 820                                 min_t(int, 32, ch->trans_skb->len));
 821         } else {
 822                 skb_queue_tail(&ch->io_queue, skb);
 823                 ccw_idx = 3;
 824         }
 825         ch->retry = 0;
 826         fsm_newstate(ch->fsm, CTC_STATE_TX);
 827         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 828
 829         if (do_debug_ccw)
 830                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 831                                         sizeof(struct ccw1) * 3);
 832
 833         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 834         ch->prof.send_stamp = jiffies;
 835         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
 836         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 837         if (ccw_idx == 3)
 838                 ch->prof.doios_single++;
 839         if (rc != 0) {
 840                 fsm_deltimer(&ch->timer);
 841                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 842                 if (ccw_idx == 3)
 843                         skb_dequeue_tail(&ch->io_queue);
 844         } else if (ccw_idx == 0) {
 845                 priv->stats.tx_packets++;
 846                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 847         }
 848         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 849                 ctcmpc_send_sweep_req(ch);
 850
 851         goto done;
 852 nomem_exit:
 853         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 854                         "%s(%s): MEMORY allocation ERROR\n",
 855                         CTCM_FUNTAIL, ch->id);
 856         rc = -ENOMEM;
 857         refcount_dec(&skb->users);
 858         dev_kfree_skb_any(skb);
 859         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 860 done:
 861         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 862         return rc;
 863 }
 864
 865 /**
 866  * Start transmission of a packet.
 867  * Called from generic network device layer.
 868  *
 869  *  skb         Pointer to buffer containing the packet.
 870  *  dev         Pointer to interface struct.
 871  *
 872  * returns 0 if packet consumed, !0 if packet rejected.
 873  *         Note: If we return !0, then the packet is free'd by
 874  *               the generic network layer.
 875  */
 876 /* first merge version - leaving both functions separated */
 877 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 878 {
 879         struct ctcm_priv *priv = dev->ml_priv;
 880
 881         if (skb == NULL) {
 882                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 883                                 "%s(%s): NULL sk_buff passed",
 884                                         CTCM_FUNTAIL, dev->name);
 885                 priv->stats.tx_dropped++;
 886                 return NETDEV_TX_OK;
 887         }
 888         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 889                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 890                         "%s(%s): Got sk_buff with head room < %ld bytes",
 891                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 892                 dev_kfree_skb(skb);
 893                 priv->stats.tx_dropped++;
 894                 return NETDEV_TX_OK;
 895         }
 896
 897         /*
 898          * If channels are not running, try to restart them
 899          * and throw away packet.
 900          */
 901         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 902                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 903                 dev_kfree_skb(skb);
 904                 priv->stats.tx_dropped++;
 905                 priv->stats.tx_errors++;
 906                 priv->stats.tx_carrier_errors++;
 907                 return NETDEV_TX_OK;
 908         }
 909
 910         if (ctcm_test_and_set_busy(dev))
 911                 return NETDEV_TX_BUSY;
 912
 913         netif_trans_update(dev);
 914         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 915                 return NETDEV_TX_BUSY;
 916         return NETDEV_TX_OK;
 917 }
 918
 919 /* unmerged MPC variant of ctcm_tx */
 920 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 921 {
 922         int len = 0;
 923         struct ctcm_priv *priv = dev->ml_priv;
 924         struct mpc_group *grp  = priv->mpcg;
 925         struct sk_buff *newskb = NULL;
 926
 927         /*
 928          * Some sanity checks ...
 929          */
 930         if (skb == NULL) {
 931                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 932                         "%s(%s): NULL sk_buff passed",
 933                                         CTCM_FUNTAIL, dev->name);
 934                 priv->stats.tx_dropped++;
 935                                         goto done;
 936         }
 937         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 938                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 939                         "%s(%s): Got sk_buff with head room < %ld bytes",
 940                         CTCM_FUNTAIL, dev->name,
 941                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 942
 943                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 944
 945                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 946                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 947
 948                 if (!newskb) {
 949                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 950                                 "%s: %s: __dev_alloc_skb failed",
 951                                                 __func__, dev->name);
 952
 953                         dev_kfree_skb_any(skb);
 954                         priv->stats.tx_dropped++;
 955                         priv->stats.tx_errors++;
 956                         priv->stats.tx_carrier_errors++;
 957                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 958                                         goto done;
 959                 }
 960                 newskb->protocol = skb->protocol;
 961                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 962                 skb_put_data(newskb, skb->data, skb->len);
 963                 dev_kfree_skb_any(skb);
 964                 skb = newskb;
 965         }
 966
 967         /*
 968          * If channels are not running,
 969          * notify anybody about a link failure and throw
 970          * away packet.
 971          */
 972         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 973            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 974                 dev_kfree_skb_any(skb);
 975                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 976                         "%s(%s): inactive MPCGROUP - dropped",
 977                                         CTCM_FUNTAIL, dev->name);
 978                 priv->stats.tx_dropped++;
 979                 priv->stats.tx_errors++;
 980                 priv->stats.tx_carrier_errors++;
 981                                         goto done;
 982         }
 983
 984         if (ctcm_test_and_set_busy(dev)) {
 985                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 986                         "%s(%s): device busy - dropped",
 987                                         CTCM_FUNTAIL, dev->name);
 988                 dev_kfree_skb_any(skb);
 989                 priv->stats.tx_dropped++;
 990                 priv->stats.tx_errors++;
 991                 priv->stats.tx_carrier_errors++;
 992                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 993                                         goto done;
 994         }
 995
 996         netif_trans_update(dev);
 997         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
 998                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 999                         "%s(%s): device error - dropped",
1000                                         CTCM_FUNTAIL, dev->name);
1001                 dev_kfree_skb_any(skb);
1002                 priv->stats.tx_dropped++;
1003                 priv->stats.tx_errors++;
1004                 priv->stats.tx_carrier_errors++;
1005                 ctcm_clear_busy(dev);
1006                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1007                                         goto done;
1008         }
1009         ctcm_clear_busy(dev);
1010 done:
1011         if (do_debug)
1012                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1013
1014         return NETDEV_TX_OK;    /* handle freeing of skb here */
1015 }
1016
1017
1018 /**
1019  * Sets MTU of an interface.
1020  *
1021  *  dev         Pointer to interface struct.
1022  *  new_mtu     The new MTU to use for this interface.
1023  *
1024  * returns 0 on success, -EINVAL if MTU is out of valid range.
1025  *         (valid range is 576 .. 65527). If VM is on the
1026  *         remote side, maximum MTU is 32760, however this is
1027  *         not checked here.
1028  */
1029 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1030 {
1031         struct ctcm_priv *priv;
1032         int max_bufsize;
1033
1034         priv = dev->ml_priv;
1035         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1036
1037         if (IS_MPC(priv)) {
1038                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1039                         return -EINVAL;
1040                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1041         } else {
1042                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1043                         return -EINVAL;
1044                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1045         }
1046         dev->mtu = new_mtu;
1047         return 0;
1048 }
1049
1050 /**
1051  * Returns interface statistics of a device.
1052  *
1053  *  dev         Pointer to interface struct.
1054  *
1055  * returns Pointer to stats struct of this interface.
1056  */
1057 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1058 {
1059         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1060 }
1061
1062 static void ctcm_free_netdevice(struct net_device *dev)
1063 {
1064         struct ctcm_priv *priv;
1065         struct mpc_group *grp;
1066
1067         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1068                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1069         priv = dev->ml_priv;
1070         if (priv) {
1071                 grp = priv->mpcg;
1072                 if (grp) {
1073                         if (grp->fsm)
1074                                 kfree_fsm(grp->fsm);
1075                         dev_kfree_skb(grp->xid_skb);
1076                         dev_kfree_skb(grp->rcvd_xid_skb);
1077                         tasklet_kill(&grp->mpc_tasklet2);
1078                         kfree(grp);
1079                         priv->mpcg = NULL;
1080                 }
1081                 if (priv->fsm) {
1082                         kfree_fsm(priv->fsm);
1083                         priv->fsm = NULL;
1084                 }
1085                 kfree(priv->xid);
1086                 priv->xid = NULL;
1087         /*
1088          * Note: kfree(priv); is done in "opposite" function of
1089          * allocator function probe_device which is remove_device.
1090          */
1091         }
1092 #ifdef MODULE
1093         free_netdev(dev);
1094 #endif
1095 }
1096
1097 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1098
1099 static const struct net_device_ops ctcm_netdev_ops = {
1100         .ndo_open               = ctcm_open,
1101         .ndo_stop               = ctcm_close,
1102         .ndo_get_stats          = ctcm_stats,
1103         .ndo_change_mtu         = ctcm_change_mtu,
1104         .ndo_start_xmit         = ctcm_tx,
1105 };
1106
1107 static const struct net_device_ops ctcm_mpc_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         = ctcmpc_tx,
1113 };
1114
1115 static void ctcm_dev_setup(struct net_device *dev)
1116 {
1117         dev->type = ARPHRD_SLIP;
1118         dev->tx_queue_len = 100;
1119         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1120         dev->min_mtu = 576;
1121         dev->max_mtu = 65527;
1122 }
1123
1124 /*
1125  * Initialize everything of the net device except the name and the
1126  * channel structs.
1127  */
1128 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1129 {
1130         struct net_device *dev;
1131         struct mpc_group *grp;
1132         if (!priv)
1133                 return NULL;
1134
1135         if (IS_MPC(priv))
1136                 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1137                                    ctcm_dev_setup);
1138         else
1139                 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1140                                    ctcm_dev_setup);
1141
1142         if (!dev) {
1143                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1144                         "%s: MEMORY allocation ERROR",
1145                         CTCM_FUNTAIL);
1146                 return NULL;
1147         }
1148         dev->ml_priv = priv;
1149         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1150                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1151                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1152         if (priv->fsm == NULL) {
1153                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1154                 free_netdev(dev);
1155                 return NULL;
1156         }
1157         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1158         fsm_settimer(priv->fsm, &priv->restart_timer);
1159
1160         if (IS_MPC(priv)) {
1161                 /*  MPC Group Initializations  */
1162                 grp = ctcmpc_init_mpc_group(priv);
1163                 if (grp == NULL) {
1164                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1165                         free_netdev(dev);
1166                         return NULL;
1167                 }
1168                 tasklet_init(&grp->mpc_tasklet2,
1169                                 mpc_group_ready, (unsigned long)dev);
1170                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1171                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1172
1173                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1174                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1175                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1176         } else {
1177                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1178                 dev->netdev_ops = &ctcm_netdev_ops;
1179                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1180         }
1181
1182         CTCMY_DBF_DEV(SETUP, dev, "finished");
1183
1184         return dev;
1185 }
1186
1187 /**
1188  * Main IRQ handler.
1189  *
1190  *  cdev        The ccw_device the interrupt is for.
1191  *  intparm     interruption parameter.
1192  *  irb         interruption response block.
1193  */
1194 static void ctcm_irq_handler(struct ccw_device *cdev,
1195                                 unsigned long intparm, struct irb *irb)
1196 {
1197         struct channel          *ch;
1198         struct net_device       *dev;
1199         struct ctcm_priv        *priv;
1200         struct ccwgroup_device  *cgdev;
1201         int cstat;
1202         int dstat;
1203
1204         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1205                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1206
1207         if (ctcm_check_irb_error(cdev, irb))
1208                 return;
1209
1210         cgdev = dev_get_drvdata(&cdev->dev);
1211
1212         cstat = irb->scsw.cmd.cstat;
1213         dstat = irb->scsw.cmd.dstat;
1214
1215         /* Check for unsolicited interrupts. */
1216         if (cgdev == NULL) {
1217                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1218                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1219                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1220                 dev_warn(&cdev->dev,
1221                         "The adapter received a non-specific IRQ\n");
1222                 return;
1223         }
1224
1225         priv = dev_get_drvdata(&cgdev->dev);
1226
1227         /* Try to extract channel from driver data. */
1228         if (priv->channel[CTCM_READ]->cdev == cdev)
1229                 ch = priv->channel[CTCM_READ];
1230         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1231                 ch = priv->channel[CTCM_WRITE];
1232         else {
1233                 dev_err(&cdev->dev,
1234                         "%s: Internal error: Can't determine channel for "
1235                         "interrupt device %s\n",
1236                         __func__, dev_name(&cdev->dev));
1237                         /* Explain: inconsistent internal structures */
1238                 return;
1239         }
1240
1241         dev = ch->netdev;
1242         if (dev == NULL) {
1243                 dev_err(&cdev->dev,
1244                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1245                         __func__, ch);
1246                         /* Explain: inconsistent internal structures */
1247                 return;
1248         }
1249
1250         /* Copy interruption response block. */
1251         memcpy(ch->irb, irb, sizeof(struct irb));
1252
1253         /* Issue error message and return on subchannel error code */
1254         if (irb->scsw.cmd.cstat) {
1255                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1256                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1257                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1258                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1259                 dev_warn(&cdev->dev,
1260                                 "A check occurred on the subchannel\n");
1261                 return;
1262         }
1263
1264         /* Check the reason-code of a unit check */
1265         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1266                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1267                         /* print it only once */
1268                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1269                                 "%s(%s): sense=%02x, ds=%02x",
1270                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1271                 ccw_unit_check(ch, irb->ecw[0]);
1272                 return;
1273         }
1274         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1275                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1276                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1277                 else
1278                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1279                 return;
1280         }
1281         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1282                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1283                 return;
1284         }
1285         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1286             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1287             (irb->scsw.cmd.stctl ==
1288              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1289                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1290         else
1291                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1292
1293 }
1294
1295 static const struct device_type ctcm_devtype = {
1296         .name = "ctcm",
1297         .groups = ctcm_attr_groups,
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
1312         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1313                         "%s %p",
1314                         __func__, cgdev);
1315
1316         if (!get_device(&cgdev->dev))
1317                 return -ENODEV;
1318
1319         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1320         if (!priv) {
1321                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1322                         "%s: memory allocation failure",
1323                         CTCM_FUNTAIL);
1324                 put_device(&cgdev->dev);
1325                 return -ENOMEM;
1326         }
1327         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1328         cgdev->cdev[0]->handler = ctcm_irq_handler;
1329         cgdev->cdev[1]->handler = ctcm_irq_handler;
1330         dev_set_drvdata(&cgdev->dev, priv);
1331         cgdev->dev.type = &ctcm_devtype;
1332
1333         return 0;
1334 }
1335
1336 /**
1337  * Add a new channel to the list of channels.
1338  * Keeps the channel list sorted.
1339  *
1340  *  cdev        The ccw_device to be added.
1341  *  type        The type class of the new channel.
1342  *  priv        Points to the private data of the ccwgroup_device.
1343  *
1344  * returns 0 on success, !0 on error.
1345  */
1346 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1347                                 struct ctcm_priv *priv)
1348 {
1349         struct channel **c = &channels;
1350         struct channel *ch;
1351         int ccw_num;
1352         int rc = 0;
1353
1354         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1355                 "%s(%s), type %d, proto %d",
1356                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1357
1358         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1359         if (ch == NULL)
1360                 return -ENOMEM;
1361
1362         ch->protocol = priv->protocol;
1363         if (IS_MPC(priv)) {
1364                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1365                 if (ch->discontact_th == NULL)
1366                                         goto nomem_return;
1367
1368                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1369                 tasklet_init(&ch->ch_disc_tasklet,
1370                         mpc_action_send_discontact, (unsigned long)ch);
1371
1372                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1373                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1374                 ccw_num = 17;
1375         } else
1376                 ccw_num = 8;
1377
1378         ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1379         if (ch->ccw == NULL)
1380                                         goto nomem_return;
1381
1382         ch->cdev = cdev;
1383         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1384         ch->type = type;
1385
1386         /**
1387          * "static" ccws are used in the following way:
1388          *
1389          * ccw[0..2] (Channel program for generic I/O):
1390          *           0: prepare
1391          *           1: read or write (depending on direction) with fixed
1392          *              buffer (idal allocated once when buffer is allocated)
1393          *           2: nop
1394          * ccw[3..5] (Channel program for direct write of packets)
1395          *           3: prepare
1396          *           4: write (idal allocated on every write).
1397          *           5: nop
1398          * ccw[6..7] (Channel program for initial channel setup):
1399          *           6: set extended mode
1400          *           7: nop
1401          *
1402          * ch->ccw[0..5] are initialized in ch_action_start because
1403          * the channel's direction is yet unknown here.
1404          *
1405          * ccws used for xid2 negotiations
1406          *  ch-ccw[8-14] need to be used for the XID exchange either
1407          *    X side XID2 Processing
1408          *       8:  write control
1409          *       9:  write th
1410          *           10: write XID
1411          *           11: read th from secondary
1412          *           12: read XID   from secondary
1413          *           13: read 4 byte ID
1414          *           14: nop
1415          *    Y side XID Processing
1416          *           8:  sense
1417          *       9:  read th
1418          *           10: read XID
1419          *           11: write th
1420          *           12: write XID
1421          *           13: write 4 byte ID
1422          *           14: nop
1423          *
1424          *  ccws used for double noop due to VM timing issues
1425          *  which result in unrecoverable Busy on channel
1426          *       15: nop
1427          *       16: nop
1428          */
1429         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1430         ch->ccw[6].flags        = CCW_FLAG_SLI;
1431
1432         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1433         ch->ccw[7].flags        = CCW_FLAG_SLI;
1434
1435         if (IS_MPC(priv)) {
1436                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1437                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1438                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1439                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1440
1441                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1442                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1443
1444                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1445                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1446                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1447                                 mpc_ch_fsm_len, GFP_KERNEL);
1448         } else {
1449                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1450                                 ctc_ch_event_names, CTC_NR_STATES,
1451                                 CTC_NR_EVENTS, ch_fsm,
1452                                 ch_fsm_len, GFP_KERNEL);
1453         }
1454         if (ch->fsm == NULL)
1455                                 goto nomem_return;
1456
1457         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1458
1459         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1460         if (ch->irb == NULL)
1461                                 goto nomem_return;
1462
1463         while (*c && ctcm_less_than((*c)->id, ch->id))
1464                 c = &(*c)->next;
1465
1466         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1467                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1468                                 "%s (%s) already in list, using old entry",
1469                                 __func__, (*c)->id);
1470
1471                                 goto free_return;
1472         }
1473
1474         spin_lock_init(&ch->collect_lock);
1475
1476         fsm_settimer(ch->fsm, &ch->timer);
1477         skb_queue_head_init(&ch->io_queue);
1478         skb_queue_head_init(&ch->collect_queue);
1479
1480         if (IS_MPC(priv)) {
1481                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1482                 skb_queue_head_init(&ch->sweep_queue);
1483         }
1484         ch->next = *c;
1485         *c = ch;
1486         return 0;
1487
1488 nomem_return:
1489         rc = -ENOMEM;
1490
1491 free_return:    /* note that all channel pointers are 0 or valid */
1492         kfree(ch->ccw);
1493         kfree(ch->discontact_th);
1494         kfree_fsm(ch->fsm);
1495         kfree(ch->irb);
1496         kfree(ch);
1497         return rc;
1498 }
1499
1500 /*
1501  * Return type of a detected device.
1502  */
1503 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1504 {
1505         enum ctcm_channel_types type;
1506         type = (enum ctcm_channel_types)id->driver_info;
1507
1508         if (type == ctcm_channel_type_ficon)
1509                 type = ctcm_channel_type_escon;
1510
1511         return type;
1512 }
1513
1514 /**
1515  *
1516  * Setup an interface.
1517  *
1518  *  cgdev       Device to be setup.
1519  *
1520  * returns 0 on success, !0 on failure.
1521  */
1522 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1523 {
1524         char read_id[CTCM_ID_SIZE];
1525         char write_id[CTCM_ID_SIZE];
1526         int direction;
1527         enum ctcm_channel_types type;
1528         struct ctcm_priv *priv;
1529         struct net_device *dev;
1530         struct ccw_device *cdev0;
1531         struct ccw_device *cdev1;
1532         struct channel *readc;
1533         struct channel *writec;
1534         int ret;
1535         int result;
1536
1537         priv = dev_get_drvdata(&cgdev->dev);
1538         if (!priv) {
1539                 result = -ENODEV;
1540                 goto out_err_result;
1541         }
1542
1543         cdev0 = cgdev->cdev[0];
1544         cdev1 = cgdev->cdev[1];
1545
1546         type = get_channel_type(&cdev0->id);
1547
1548         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1549         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1550
1551         ret = add_channel(cdev0, type, priv);
1552         if (ret) {
1553                 result = ret;
1554                 goto out_err_result;
1555         }
1556         ret = add_channel(cdev1, type, priv);
1557         if (ret) {
1558                 result = ret;
1559                 goto out_remove_channel1;
1560         }
1561
1562         ret = ccw_device_set_online(cdev0);
1563         if (ret != 0) {
1564                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1565                         "%s(%s) set_online rc=%d",
1566                                 CTCM_FUNTAIL, read_id, ret);
1567                 result = -EIO;
1568                 goto out_remove_channel2;
1569         }
1570
1571         ret = ccw_device_set_online(cdev1);
1572         if (ret != 0) {
1573                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1574                         "%s(%s) set_online rc=%d",
1575                                 CTCM_FUNTAIL, write_id, ret);
1576
1577                 result = -EIO;
1578                 goto out_ccw1;
1579         }
1580
1581         dev = ctcm_init_netdevice(priv);
1582         if (dev == NULL) {
1583                 result = -ENODEV;
1584                 goto out_ccw2;
1585         }
1586
1587         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1588                 priv->channel[direction] =
1589                         channel_get(type, direction == CTCM_READ ?
1590                                 read_id : write_id, direction);
1591                 if (priv->channel[direction] == NULL) {
1592                         if (direction == CTCM_WRITE)
1593                                 channel_free(priv->channel[CTCM_READ]);
1594                         result = -ENODEV;
1595                         goto out_dev;
1596                 }
1597                 priv->channel[direction]->netdev = dev;
1598                 priv->channel[direction]->protocol = priv->protocol;
1599                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1600         }
1601         /* sysfs magic */
1602         SET_NETDEV_DEV(dev, &cgdev->dev);
1603
1604         if (register_netdev(dev)) {
1605                 result = -ENODEV;
1606                 goto out_dev;
1607         }
1608
1609         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1610
1611         dev_info(&dev->dev,
1612                 "setup OK : r/w = %s/%s, protocol : %d\n",
1613                         priv->channel[CTCM_READ]->id,
1614                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1615
1616         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1617                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1618                         priv->channel[CTCM_READ]->id,
1619                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1620
1621         return 0;
1622 out_dev:
1623         ctcm_free_netdevice(dev);
1624 out_ccw2:
1625         ccw_device_set_offline(cgdev->cdev[1]);
1626 out_ccw1:
1627         ccw_device_set_offline(cgdev->cdev[0]);
1628 out_remove_channel2:
1629         readc = channel_get(type, read_id, CTCM_READ);
1630         channel_remove(readc);
1631 out_remove_channel1:
1632         writec = channel_get(type, write_id, CTCM_WRITE);
1633         channel_remove(writec);
1634 out_err_result:
1635         return result;
1636 }
1637
1638 /**
1639  * Shutdown an interface.
1640  *
1641  *  cgdev       Device to be shut down.
1642  *
1643  * returns 0 on success, !0 on failure.
1644  */
1645 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1646 {
1647         struct ctcm_priv *priv;
1648         struct net_device *dev;
1649
1650         priv = dev_get_drvdata(&cgdev->dev);
1651         if (!priv)
1652                 return -ENODEV;
1653
1654         if (priv->channel[CTCM_READ]) {
1655                 dev = priv->channel[CTCM_READ]->netdev;
1656                 CTCM_DBF_DEV(SETUP, dev, "");
1657                 /* Close the device */
1658                 ctcm_close(dev);
1659                 dev->flags &= ~IFF_RUNNING;
1660                 channel_free(priv->channel[CTCM_READ]);
1661         } else
1662                 dev = NULL;
1663
1664         if (priv->channel[CTCM_WRITE])
1665                 channel_free(priv->channel[CTCM_WRITE]);
1666
1667         if (dev) {
1668                 unregister_netdev(dev);
1669                 ctcm_free_netdevice(dev);
1670         }
1671
1672         if (priv->fsm)
1673                 kfree_fsm(priv->fsm);
1674
1675         ccw_device_set_offline(cgdev->cdev[1]);
1676         ccw_device_set_offline(cgdev->cdev[0]);
1677         channel_remove(priv->channel[CTCM_READ]);
1678         channel_remove(priv->channel[CTCM_WRITE]);
1679         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1680
1681         return 0;
1682
1683 }
1684
1685
1686 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1687 {
1688         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1689
1690         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1691                         "removing device %p, proto : %d",
1692                         cgdev, priv->protocol);
1693
1694         if (cgdev->state == CCWGROUP_ONLINE)
1695                 ctcm_shutdown_device(cgdev);
1696         dev_set_drvdata(&cgdev->dev, NULL);
1697         kfree(priv);
1698         put_device(&cgdev->dev);
1699 }
1700
1701 static struct ccw_device_id ctcm_ids[] = {
1702         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1703         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1704         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1705         {},
1706 };
1707 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1708
1709 static struct ccw_driver ctcm_ccw_driver = {
1710         .driver = {
1711                 .owner  = THIS_MODULE,
1712                 .name   = "ctcm",
1713         },
1714         .ids    = ctcm_ids,
1715         .probe  = ccwgroup_probe_ccwdev,
1716         .remove = ccwgroup_remove_ccwdev,
1717         .int_class = IRQIO_CTC,
1718 };
1719
1720 static struct ccwgroup_driver ctcm_group_driver = {
1721         .driver = {
1722                 .owner  = THIS_MODULE,
1723                 .name   = CTC_DRIVER_NAME,
1724         },
1725         .ccw_driver  = &ctcm_ccw_driver,
1726         .setup       = ctcm_probe_device,
1727         .remove      = ctcm_remove_device,
1728         .set_online  = ctcm_new_device,
1729         .set_offline = ctcm_shutdown_device,
1730 };
1731
1732 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1733                            size_t count)
1734 {
1735         int err;
1736
1737         err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1738         return err ? err : count;
1739 }
1740 static DRIVER_ATTR_WO(group);
1741
1742 static struct attribute *ctcm_drv_attrs[] = {
1743         &driver_attr_group.attr,
1744         NULL,
1745 };
1746 static struct attribute_group ctcm_drv_attr_group = {
1747         .attrs = ctcm_drv_attrs,
1748 };
1749 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1750         &ctcm_drv_attr_group,
1751         NULL,
1752 };
1753
1754 /*
1755  * Module related routines
1756  */
1757
1758 /*
1759  * Prepare to be unloaded. Free IRQ's and release all resources.
1760  * This is called just before this module is unloaded. It is
1761  * not called, if the usage count is !0, so we don't need to check
1762  * for that.
1763  */
1764 static void __exit ctcm_exit(void)
1765 {
1766         ccwgroup_driver_unregister(&ctcm_group_driver);
1767         ccw_driver_unregister(&ctcm_ccw_driver);
1768         root_device_unregister(ctcm_root_dev);
1769         ctcm_unregister_dbf_views();
1770         pr_info("CTCM driver unloaded\n");
1771 }
1772
1773 /*
1774  * Print Banner.
1775  */
1776 static void print_banner(void)
1777 {
1778         pr_info("CTCM driver initialized\n");
1779 }
1780
1781 /**
1782  * Initialize module.
1783  * This is called just after the module is loaded.
1784  *
1785  * returns 0 on success, !0 on error.
1786  */
1787 static int __init ctcm_init(void)
1788 {
1789         int ret;
1790
1791         channels = NULL;
1792
1793         ret = ctcm_register_dbf_views();
1794         if (ret)
1795                 goto out_err;
1796         ctcm_root_dev = root_device_register("ctcm");
1797         ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1798         if (ret)
1799                 goto register_err;
1800         ret = ccw_driver_register(&ctcm_ccw_driver);
1801         if (ret)
1802                 goto ccw_err;
1803         ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1804         ret = ccwgroup_driver_register(&ctcm_group_driver);
1805         if (ret)
1806                 goto ccwgroup_err;
1807         print_banner();
1808         return 0;
1809
1810 ccwgroup_err:
1811         ccw_driver_unregister(&ctcm_ccw_driver);
1812 ccw_err:
1813         root_device_unregister(ctcm_root_dev);
1814 register_err:
1815         ctcm_unregister_dbf_views();
1816 out_err:
1817         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1818                 __func__, ret);
1819         return ret;
1820 }
1821
1822 module_init(ctcm_init);
1823 module_exit(ctcm_exit);
1824
1825 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1826 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1827 MODULE_LICENSE("GPL");
1828