drivers/s390/net/ctcm_main.c

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