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   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/module.h>
  28 #include <linux/init.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/errno.h>
  32 #include <linux/types.h>
  33 #include <linux/interrupt.h>
  34 #include <linux/timer.h>
  35 #include <linux/bitops.h>
  36
  37 #include <linux/signal.h>
  38 #include <linux/string.h>
  39
  40 #include <linux/ip.h>
  41 #include <linux/if_arp.h>
  42 #include <linux/tcp.h>
  43 #include <linux/skbuff.h>
  44 #include <linux/ctype.h>
  45 #include <net/dst.h>
  46
  47 #include <linux/io.h>
  48 #include <asm/ccwdev.h>
  49 #include <asm/ccwgroup.h>
  50 #include <linux/uaccess.h>
  51
  52 #include <asm/idals.h>
  53
  54 #include "cu3088.h"
  55 #include "ctcm_fsms.h"
  56 #include "ctcm_main.h"
  57
  58 /* Some common global variables */
  59
  60 /*
  61  * Linked list of all detected channels.
  62  */
  63 struct channel *channels;
  64
  65 /**
  66  * Unpack a just received skb and hand it over to
  67  * upper layers.
  68  *
  69  *  ch          The channel where this skb has been received.
  70  *  pskb        The received skb.
  71  */
  72 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  73 {
  74         struct net_device *dev = ch->netdev;
  75         struct ctcm_priv *priv = dev->ml_priv;
  76         __u16 len = *((__u16 *) pskb->data);
  77
  78         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  79         skb_pull(pskb, 2);
  80         pskb->dev = dev;
  81         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  82         while (len > 0) {
  83                 struct sk_buff *skb;
  84                 int skblen;
  85                 struct ll_header *header = (struct ll_header *)pskb->data;
  86
  87                 skb_pull(pskb, LL_HEADER_LENGTH);
  88                 if ((ch->protocol == CTCM_PROTO_S390) &&
  89                     (header->type != ETH_P_IP)) {
  90                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  91                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  92                                 /*
  93                                  * Check packet type only if we stick strictly
  94                                  * to S/390's protocol of OS390. This only
  95                                  * supports IP. Otherwise allow any packet
  96                                  * type.
  97                                  */
  98                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
  99                                         "%s(%s): Illegal packet type 0x%04x"
 100                                         " - dropping",
 101                                         CTCM_FUNTAIL, dev->name, header->type);
 102                         }
 103                         priv->stats.rx_dropped++;
 104                         priv->stats.rx_frame_errors++;
 105                         return;
 106                 }
 107                 pskb->protocol = ntohs(header->type);
 108                 if ((header->length <= LL_HEADER_LENGTH) ||
 109                     (len <= LL_HEADER_LENGTH)) {
 110                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 111                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 112                                         "%s(%s): Illegal packet size %d(%d,%d)"
 113                                         "- dropping",
 114                                         CTCM_FUNTAIL, dev->name,
 115                                         header->length, dev->mtu, len);
 116                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 117                         }
 118
 119                         priv->stats.rx_dropped++;
 120                         priv->stats.rx_length_errors++;
 121                         return;
 122                 }
 123                 header->length -= LL_HEADER_LENGTH;
 124                 len -= LL_HEADER_LENGTH;
 125                 if ((header->length > skb_tailroom(pskb)) ||
 126                         (header->length > len)) {
 127                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 128                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 129                                         "%s(%s): Packet size %d (overrun)"
 130                                         " - dropping", CTCM_FUNTAIL,
 131                                                 dev->name, header->length);
 132                                 ch->logflags |= LOG_FLAG_OVERRUN;
 133                         }
 134
 135                         priv->stats.rx_dropped++;
 136                         priv->stats.rx_length_errors++;
 137                         return;
 138                 }
 139                 skb_put(pskb, header->length);
 140                 skb_reset_mac_header(pskb);
 141                 len -= header->length;
 142                 skb = dev_alloc_skb(pskb->len);
 143                 if (!skb) {
 144                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 145                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 146                                         "%s(%s): MEMORY allocation error",
 147                                                 CTCM_FUNTAIL, dev->name);
 148                                 ch->logflags |= LOG_FLAG_NOMEM;
 149                         }
 150                         priv->stats.rx_dropped++;
 151                         return;
 152                 }
 153                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 154                                           pskb->len);
 155                 skb_reset_mac_header(skb);
 156                 skb->dev = pskb->dev;
 157                 skb->protocol = pskb->protocol;
 158                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 159                 skblen = skb->len;
 160                 /*
 161                  * reset logflags
 162                  */
 163                 ch->logflags = 0;
 164                 priv->stats.rx_packets++;
 165                 priv->stats.rx_bytes += skblen;
 166                 netif_rx_ni(skb);
 167                 if (len > 0) {
 168                         skb_pull(pskb, header->length);
 169                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 170                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 171                                         "Overrun in ctcm_unpack_skb");
 172                                 ch->logflags |= LOG_FLAG_OVERRUN;
 173                                 return;
 174                         }
 175                         skb_put(pskb, LL_HEADER_LENGTH);
 176                 }
 177         }
 178 }
 179
 180 /**
 181  * Release a specific channel in the channel list.
 182  *
 183  *  ch          Pointer to channel struct to be released.
 184  */
 185 static void channel_free(struct channel *ch)
 186 {
 187         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 188         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 189         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 190 }
 191
 192 /**
 193  * Remove a specific channel in the channel list.
 194  *
 195  *  ch          Pointer to channel struct to be released.
 196  */
 197 static void channel_remove(struct channel *ch)
 198 {
 199         struct channel **c = &channels;
 200         char chid[CTCM_ID_SIZE+1];
 201         int ok = 0;
 202
 203         if (ch == NULL)
 204                 return;
 205         else
 206                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 207
 208         channel_free(ch);
 209         while (*c) {
 210                 if (*c == ch) {
 211                         *c = ch->next;
 212                         fsm_deltimer(&ch->timer);
 213                         if (IS_MPC(ch))
 214                                 fsm_deltimer(&ch->sweep_timer);
 215
 216                         kfree_fsm(ch->fsm);
 217                         clear_normalized_cda(&ch->ccw[4]);
 218                         if (ch->trans_skb != NULL) {
 219                                 clear_normalized_cda(&ch->ccw[1]);
 220                                 dev_kfree_skb_any(ch->trans_skb);
 221                         }
 222                         if (IS_MPC(ch)) {
 223                                 tasklet_kill(&ch->ch_tasklet);
 224                                 tasklet_kill(&ch->ch_disc_tasklet);
 225                                 kfree(ch->discontact_th);
 226                         }
 227                         kfree(ch->ccw);
 228                         kfree(ch->irb);
 229                         kfree(ch);
 230                         ok = 1;
 231                         break;
 232                 }
 233                 c = &((*c)->next);
 234         }
 235
 236         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 237                         chid, ok ? "OK" : "failed");
 238 }
 239
 240 /**
 241  * Get a specific channel from the channel list.
 242  *
 243  *  type        Type of channel we are interested in.
 244  *  id          Id of channel we are interested in.
 245  *  direction   Direction we want to use this channel for.
 246  *
 247  * returns Pointer to a channel or NULL if no matching channel available.
 248  */
 249 static struct channel *channel_get(enum channel_types type,
 250                                         char *id, int direction)
 251 {
 252         struct channel *ch = channels;
 253
 254         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 255                 ch = ch->next;
 256         if (!ch) {
 257                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 258                                 "%s(%d, %s, %d) not found in channel list\n",
 259                                 CTCM_FUNTAIL, type, id, direction);
 260         } else {
 261                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 262                         ch = NULL;
 263                 else {
 264                         ch->flags |= CHANNEL_FLAGS_INUSE;
 265                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 266                         ch->flags |= (direction == WRITE)
 267                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 268                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 269                 }
 270         }
 271         return ch;
 272 }
 273
 274 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 275 {
 276         if (!IS_ERR(irb))
 277                 return 0;
 278
 279         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 280                         "irb error %ld on device %s\n",
 281                                 PTR_ERR(irb), dev_name(&cdev->dev));
 282
 283         switch (PTR_ERR(irb)) {
 284         case -EIO:
 285                 dev_err(&cdev->dev,
 286                         "An I/O-error occurred on the CTCM device\n");
 287                 break;
 288         case -ETIMEDOUT:
 289                 dev_err(&cdev->dev,
 290                         "An adapter hardware operation timed out\n");
 291                 break;
 292         default:
 293                 dev_err(&cdev->dev,
 294                         "An error occurred on the adapter hardware\n");
 295         }
 296         return PTR_ERR(irb);
 297 }
 298
 299
 300 /**
 301  * Check sense of a unit check.
 302  *
 303  *  ch          The channel, the sense code belongs to.
 304  *  sense       The sense code to inspect.
 305  */
 306 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
 307 {
 308         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 309                         "%s(%s): %02x",
 310                                 CTCM_FUNTAIL, ch->id, sense);
 311
 312         if (sense & SNS0_INTERVENTION_REQ) {
 313                 if (sense & 0x01) {
 314                         if (ch->sense_rc != 0x01) {
 315                                 pr_notice(
 316                                         "%s: The communication peer has "
 317                                         "disconnected\n", ch->id);
 318                                 ch->sense_rc = 0x01;
 319                         }
 320                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 321                 } else {
 322                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 323                                 pr_notice(
 324                                         "%s: The remote operating system is "
 325                                         "not available\n", ch->id);
 326                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 327                         }
 328                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 329                 }
 330         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 331                 if (sense & SNS0_BUS_OUT_CHECK) {
 332                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 333                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 334                                         "%s(%s): remote HW error %02x",
 335                                                 CTCM_FUNTAIL, ch->id, sense);
 336                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 337                         }
 338                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 339                 } else {
 340                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 341                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 342                                         "%s(%s): remote read parity error %02x",
 343                                                 CTCM_FUNTAIL, ch->id, sense);
 344                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 345                         }
 346                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 347                 }
 348         } else if (sense & SNS0_BUS_OUT_CHECK) {
 349                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 350                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 351                                 "%s(%s): BUS OUT error %02x",
 352                                         CTCM_FUNTAIL, ch->id, sense);
 353                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 354                 }
 355                 if (sense & 0x04)       /* data-streaming timeout */
 356                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 357                 else                    /* Data-transfer parity error */
 358                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 359         } else if (sense & SNS0_CMD_REJECT) {
 360                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 361                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 362                                 "%s(%s): Command rejected",
 363                                                 CTCM_FUNTAIL, ch->id);
 364                         ch->sense_rc = SNS0_CMD_REJECT;
 365                 }
 366         } else if (sense == 0) {
 367                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 368                         "%s(%s): Unit check ZERO",
 369                                         CTCM_FUNTAIL, ch->id);
 370                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 371         } else {
 372                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 373                         "%s(%s): Unit check code %02x unknown",
 374                                         CTCM_FUNTAIL, ch->id, sense);
 375                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 376         }
 377 }
 378
 379 int ctcm_ch_alloc_buffer(struct channel *ch)
 380 {
 381         clear_normalized_cda(&ch->ccw[1]);
 382         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 383         if (ch->trans_skb == NULL) {
 384                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 385                         "%s(%s): %s trans_skb allocation error",
 386                         CTCM_FUNTAIL, ch->id,
 387                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
 388                 return -ENOMEM;
 389         }
 390
 391         ch->ccw[1].count = ch->max_bufsize;
 392         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 393                 dev_kfree_skb(ch->trans_skb);
 394                 ch->trans_skb = NULL;
 395                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 396                         "%s(%s): %s set norm_cda failed",
 397                         CTCM_FUNTAIL, ch->id,
 398                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
 399                 return -ENOMEM;
 400         }
 401
 402         ch->ccw[1].count = 0;
 403         ch->trans_skb_data = ch->trans_skb->data;
 404         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 405         return 0;
 406 }
 407
 408 /*
 409  * Interface API for upper network layers
 410  */
 411
 412 /**
 413  * Open an interface.
 414  * Called from generic network layer when ifconfig up is run.
 415  *
 416  *  dev         Pointer to interface struct.
 417  *
 418  * returns 0 on success, -ERRNO on failure. (Never fails.)
 419  */
 420 int ctcm_open(struct net_device *dev)
 421 {
 422         struct ctcm_priv *priv = dev->ml_priv;
 423
 424         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 425         if (!IS_MPC(priv))
 426                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 427         return 0;
 428 }
 429
 430 /**
 431  * Close an interface.
 432  * Called from generic network layer when ifconfig down is run.
 433  *
 434  *  dev         Pointer to interface struct.
 435  *
 436  * returns 0 on success, -ERRNO on failure. (Never fails.)
 437  */
 438 int ctcm_close(struct net_device *dev)
 439 {
 440         struct ctcm_priv *priv = dev->ml_priv;
 441
 442         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 443         if (!IS_MPC(priv))
 444                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 445         return 0;
 446 }
 447
 448
 449 /**
 450  * Transmit a packet.
 451  * This is a helper function for ctcm_tx().
 452  *
 453  *  ch          Channel to be used for sending.
 454  *  skb         Pointer to struct sk_buff of packet to send.
 455  *            The linklevel header has already been set up
 456  *            by ctcm_tx().
 457  *
 458  * returns 0 on success, -ERRNO on failure. (Never fails.)
 459  */
 460 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 461 {
 462         unsigned long saveflags;
 463         struct ll_header header;
 464         int rc = 0;
 465         __u16 block_len;
 466         int ccw_idx;
 467         struct sk_buff *nskb;
 468         unsigned long hi;
 469
 470         /* we need to acquire the lock for testing the state
 471          * otherwise we can have an IRQ changing the state to
 472          * TXIDLE after the test but before acquiring the lock.
 473          */
 474         spin_lock_irqsave(&ch->collect_lock, saveflags);
 475         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 476                 int l = skb->len + LL_HEADER_LENGTH;
 477
 478                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 479                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 480                         return -EBUSY;
 481                 } else {
 482                         atomic_inc(&skb->users);
 483                         header.length = l;
 484                         header.type = skb->protocol;
 485                         header.unused = 0;
 486                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 487                                LL_HEADER_LENGTH);
 488                         skb_queue_tail(&ch->collect_queue, skb);
 489                         ch->collect_len += l;
 490                 }
 491                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 492                                 goto done;
 493         }
 494         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 495         /*
 496          * Protect skb against beeing free'd by upper
 497          * layers.
 498          */
 499         atomic_inc(&skb->users);
 500         ch->prof.txlen += skb->len;
 501         header.length = skb->len + LL_HEADER_LENGTH;
 502         header.type = skb->protocol;
 503         header.unused = 0;
 504         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 505         block_len = skb->len + 2;
 506         *((__u16 *)skb_push(skb, 2)) = block_len;
 507
 508         /*
 509          * IDAL support in CTCM is broken, so we have to
 510          * care about skb's above 2G ourselves.
 511          */
 512         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 513         if (hi) {
 514                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 515                 if (!nskb) {
 516                         atomic_dec(&skb->users);
 517                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 518                         ctcm_clear_busy(ch->netdev);
 519                         return -ENOMEM;
 520                 } else {
 521                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 522                         atomic_inc(&nskb->users);
 523                         atomic_dec(&skb->users);
 524                         dev_kfree_skb_irq(skb);
 525                         skb = nskb;
 526                 }
 527         }
 528
 529         ch->ccw[4].count = block_len;
 530         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 531                 /*
 532                  * idal allocation failed, try via copying to
 533                  * trans_skb. trans_skb usually has a pre-allocated
 534                  * idal.
 535                  */
 536                 if (ctcm_checkalloc_buffer(ch)) {
 537                         /*
 538                          * Remove our header. It gets added
 539                          * again on retransmit.
 540                          */
 541                         atomic_dec(&skb->users);
 542                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 543                         ctcm_clear_busy(ch->netdev);
 544                         return -ENOMEM;
 545                 }
 546
 547                 skb_reset_tail_pointer(ch->trans_skb);
 548                 ch->trans_skb->len = 0;
 549                 ch->ccw[1].count = skb->len;
 550                 skb_copy_from_linear_data(skb,
 551                                 skb_put(ch->trans_skb, skb->len), skb->len);
 552                 atomic_dec(&skb->users);
 553                 dev_kfree_skb_irq(skb);
 554                 ccw_idx = 0;
 555         } else {
 556                 skb_queue_tail(&ch->io_queue, skb);
 557                 ccw_idx = 3;
 558         }
 559         ch->retry = 0;
 560         fsm_newstate(ch->fsm, CTC_STATE_TX);
 561         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 562         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 563         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 564         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 565                                         (unsigned long)ch, 0xff, 0);
 566         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 567         if (ccw_idx == 3)
 568                 ch->prof.doios_single++;
 569         if (rc != 0) {
 570                 fsm_deltimer(&ch->timer);
 571                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 572                 if (ccw_idx == 3)
 573                         skb_dequeue_tail(&ch->io_queue);
 574                 /*
 575                  * Remove our header. It gets added
 576                  * again on retransmit.
 577                  */
 578                 skb_pull(skb, LL_HEADER_LENGTH + 2);
 579         } else if (ccw_idx == 0) {
 580                 struct net_device *dev = ch->netdev;
 581                 struct ctcm_priv *priv = dev->ml_priv;
 582                 priv->stats.tx_packets++;
 583                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 584         }
 585 done:
 586         ctcm_clear_busy(ch->netdev);
 587         return rc;
 588 }
 589
 590 static void ctcmpc_send_sweep_req(struct channel *rch)
 591 {
 592         struct net_device *dev = rch->netdev;
 593         struct ctcm_priv *priv;
 594         struct mpc_group *grp;
 595         struct th_sweep *header;
 596         struct sk_buff *sweep_skb;
 597         struct channel *ch;
 598         /* int rc = 0; */
 599
 600         priv = dev->ml_priv;
 601         grp = priv->mpcg;
 602         ch = priv->channel[WRITE];
 603
 604         /* sweep processing is not complete until response and request */
 605         /* has completed for all read channels in group                */
 606         if (grp->in_sweep == 0) {
 607                 grp->in_sweep = 1;
 608                 grp->sweep_rsp_pend_num = grp->active_channels[READ];
 609                 grp->sweep_req_pend_num = grp->active_channels[READ];
 610         }
 611
 612         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 613
 614         if (sweep_skb == NULL)  {
 615                 /* rc = -ENOMEM; */
 616                                 goto nomem;
 617         }
 618
 619         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 620
 621         if (!header) {
 622                 dev_kfree_skb_any(sweep_skb);
 623                 /* rc = -ENOMEM; */
 624                                 goto nomem;
 625         }
 626
 627         header->th.th_seg       = 0x00 ;
 628         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 629         header->th.th_blk_flag  = 0x00;
 630         header->th.th_is_xid    = 0x00;
 631         header->th.th_seq_num   = 0x00;
 632         header->sw.th_last_seq  = ch->th_seq_num;
 633
 634         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 635
 636         kfree(header);
 637
 638         dev->trans_start = jiffies;
 639         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 640
 641         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 642
 643         return;
 644
 645 nomem:
 646         grp->in_sweep = 0;
 647         ctcm_clear_busy(dev);
 648         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 649
 650         return;
 651 }
 652
 653 /*
 654  * MPC mode version of transmit_skb
 655  */
 656 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 657 {
 658         struct pdu *p_header;
 659         struct net_device *dev = ch->netdev;
 660         struct ctcm_priv *priv = dev->ml_priv;
 661         struct mpc_group *grp = priv->mpcg;
 662         struct th_header *header;
 663         struct sk_buff *nskb;
 664         int rc = 0;
 665         int ccw_idx;
 666         unsigned long hi;
 667         unsigned long saveflags = 0;    /* avoids compiler warning */
 668         __u16 block_len;
 669
 670         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 671                         __func__, dev->name, smp_processor_id(), ch,
 672                                         ch->id, fsm_getstate_str(ch->fsm));
 673
 674         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 675                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 676                 atomic_inc(&skb->users);
 677                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 678
 679                 if (!p_header) {
 680                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 681                                 goto nomem_exit;
 682                 }
 683
 684                 p_header->pdu_offset = skb->len;
 685                 p_header->pdu_proto = 0x01;
 686                 p_header->pdu_flag = 0x00;
 687                 if (skb->protocol == ntohs(ETH_P_SNAP)) {
 688                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 689                 } else {
 690                         p_header->pdu_flag |= PDU_FIRST;
 691                 }
 692                 p_header->pdu_seq = 0;
 693                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 694                        PDU_HEADER_LENGTH);
 695
 696                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 697                                 "pdu header and data for up to 32 bytes:\n",
 698                                 __func__, dev->name, skb->len);
 699                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 700
 701                 skb_queue_tail(&ch->collect_queue, skb);
 702                 ch->collect_len += skb->len;
 703                 kfree(p_header);
 704
 705                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 706                         goto done;
 707         }
 708
 709         /*
 710          * Protect skb against beeing free'd by upper
 711          * layers.
 712          */
 713         atomic_inc(&skb->users);
 714
 715         block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 716         /*
 717          * IDAL support in CTCM is broken, so we have to
 718          * care about skb's above 2G ourselves.
 719          */
 720         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 721         if (hi) {
 722                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 723                 if (!nskb) {
 724                         goto nomem_exit;
 725                 } else {
 726                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 727                         atomic_inc(&nskb->users);
 728                         atomic_dec(&skb->users);
 729                         dev_kfree_skb_irq(skb);
 730                         skb = nskb;
 731                 }
 732         }
 733
 734         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 735
 736         if (!p_header)
 737                 goto nomem_exit;
 738
 739         p_header->pdu_offset = skb->len;
 740         p_header->pdu_proto = 0x01;
 741         p_header->pdu_flag = 0x00;
 742         p_header->pdu_seq = 0;
 743         if (skb->protocol == ntohs(ETH_P_SNAP)) {
 744                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 745         } else {
 746                 p_header->pdu_flag |= PDU_FIRST;
 747         }
 748         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 749
 750         kfree(p_header);
 751
 752         if (ch->collect_len > 0) {
 753                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 754                 skb_queue_tail(&ch->collect_queue, skb);
 755                 ch->collect_len += skb->len;
 756                 skb = skb_dequeue(&ch->collect_queue);
 757                 ch->collect_len -= skb->len;
 758                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 759         }
 760
 761         p_header = (struct pdu *)skb->data;
 762         p_header->pdu_flag |= PDU_LAST;
 763
 764         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 765
 766         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 767         if (!header)
 768                 goto nomem_exit;
 769
 770         header->th_seg = 0x00;
 771         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 772         header->th_blk_flag = 0x00;
 773         header->th_is_xid = 0x00;          /* Just data here */
 774         ch->th_seq_num++;
 775         header->th_seq_num = ch->th_seq_num;
 776
 777         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 778                        __func__, dev->name, ch->th_seq_num);
 779
 780         /* put the TH on the packet */
 781         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 782
 783         kfree(header);
 784
 785         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 786                         "up to 32 bytes sent to vtam:\n",
 787                                 __func__, dev->name, skb->len);
 788         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 789
 790         ch->ccw[4].count = skb->len;
 791         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 792                 /*
 793                  * idal allocation failed, try via copying to trans_skb.
 794                  * trans_skb usually has a pre-allocated idal.
 795                  */
 796                 if (ctcm_checkalloc_buffer(ch)) {
 797                         /*
 798                          * Remove our header.
 799                          * It gets added again on retransmit.
 800                          */
 801                                 goto nomem_exit;
 802                 }
 803
 804                 skb_reset_tail_pointer(ch->trans_skb);
 805                 ch->trans_skb->len = 0;
 806                 ch->ccw[1].count = skb->len;
 807                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
 808                 atomic_dec(&skb->users);
 809                 dev_kfree_skb_irq(skb);
 810                 ccw_idx = 0;
 811                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 812                                 "up to 32 bytes sent to vtam:\n",
 813                                 __func__, dev->name, ch->trans_skb->len);
 814                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 815                                 min_t(int, 32, ch->trans_skb->len));
 816         } else {
 817                 skb_queue_tail(&ch->io_queue, skb);
 818                 ccw_idx = 3;
 819         }
 820         ch->retry = 0;
 821         fsm_newstate(ch->fsm, CTC_STATE_TX);
 822         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 823
 824         if (do_debug_ccw)
 825                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 826                                         sizeof(struct ccw1) * 3);
 827
 828         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 829         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 830         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 831                                         (unsigned long)ch, 0xff, 0);
 832         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 833         if (ccw_idx == 3)
 834                 ch->prof.doios_single++;
 835         if (rc != 0) {
 836                 fsm_deltimer(&ch->timer);
 837                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 838                 if (ccw_idx == 3)
 839                         skb_dequeue_tail(&ch->io_queue);
 840         } else if (ccw_idx == 0) {
 841                 priv->stats.tx_packets++;
 842                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 843         }
 844         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 845                 ctcmpc_send_sweep_req(ch);
 846
 847         goto done;
 848 nomem_exit:
 849         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 850                         "%s(%s): MEMORY allocation ERROR\n",
 851                         CTCM_FUNTAIL, ch->id);
 852         rc = -ENOMEM;
 853         atomic_dec(&skb->users);
 854         dev_kfree_skb_any(skb);
 855         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 856 done:
 857         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 858         return rc;
 859 }
 860
 861 /**
 862  * Start transmission of a packet.
 863  * Called from generic network device layer.
 864  *
 865  *  skb         Pointer to buffer containing the packet.
 866  *  dev         Pointer to interface struct.
 867  *
 868  * returns 0 if packet consumed, !0 if packet rejected.
 869  *         Note: If we return !0, then the packet is free'd by
 870  *               the generic network layer.
 871  */
 872 /* first merge version - leaving both functions separated */
 873 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 874 {
 875         struct ctcm_priv *priv = dev->ml_priv;
 876
 877         if (skb == NULL) {
 878                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 879                                 "%s(%s): NULL sk_buff passed",
 880                                         CTCM_FUNTAIL, dev->name);
 881                 priv->stats.tx_dropped++;
 882                 return NETDEV_TX_OK;
 883         }
 884         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 885                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 886                         "%s(%s): Got sk_buff with head room < %ld bytes",
 887                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 888                 dev_kfree_skb(skb);
 889                 priv->stats.tx_dropped++;
 890                 return NETDEV_TX_OK;
 891         }
 892
 893         /*
 894          * If channels are not running, try to restart them
 895          * and throw away packet.
 896          */
 897         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 898                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 899                 dev_kfree_skb(skb);
 900                 priv->stats.tx_dropped++;
 901                 priv->stats.tx_errors++;
 902                 priv->stats.tx_carrier_errors++;
 903                 return NETDEV_TX_OK;
 904         }
 905
 906         if (ctcm_test_and_set_busy(dev))
 907                 return NETDEV_TX_BUSY;
 908
 909         dev->trans_start = jiffies;
 910         if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0)
 911                 return NETDEV_TX_BUSY;
 912         return NETDEV_TX_OK;
 913 }
 914
 915 /* unmerged MPC variant of ctcm_tx */
 916 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 917 {
 918         int len = 0;
 919         struct ctcm_priv *priv = dev->ml_priv;
 920         struct mpc_group *grp  = priv->mpcg;
 921         struct sk_buff *newskb = NULL;
 922
 923         /*
 924          * Some sanity checks ...
 925          */
 926         if (skb == NULL) {
 927                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 928                         "%s(%s): NULL sk_buff passed",
 929                                         CTCM_FUNTAIL, dev->name);
 930                 priv->stats.tx_dropped++;
 931                                         goto done;
 932         }
 933         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 934                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 935                         "%s(%s): Got sk_buff with head room < %ld bytes",
 936                         CTCM_FUNTAIL, dev->name,
 937                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 938
 939                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 940
 941                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 942                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 943
 944                 if (!newskb) {
 945                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 946                                 "%s: %s: __dev_alloc_skb failed",
 947                                                 __func__, dev->name);
 948
 949                         dev_kfree_skb_any(skb);
 950                         priv->stats.tx_dropped++;
 951                         priv->stats.tx_errors++;
 952                         priv->stats.tx_carrier_errors++;
 953                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 954                                         goto done;
 955                 }
 956                 newskb->protocol = skb->protocol;
 957                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 958                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 959                 dev_kfree_skb_any(skb);
 960                 skb = newskb;
 961         }
 962
 963         /*
 964          * If channels are not running,
 965          * notify anybody about a link failure and throw
 966          * away packet.
 967          */
 968         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 969            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 970                 dev_kfree_skb_any(skb);
 971                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 972                         "%s(%s): inactive MPCGROUP - dropped",
 973                                         CTCM_FUNTAIL, dev->name);
 974                 priv->stats.tx_dropped++;
 975                 priv->stats.tx_errors++;
 976                 priv->stats.tx_carrier_errors++;
 977                                         goto done;
 978         }
 979
 980         if (ctcm_test_and_set_busy(dev)) {
 981                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 982                         "%s(%s): device busy - dropped",
 983                                         CTCM_FUNTAIL, dev->name);
 984                 dev_kfree_skb_any(skb);
 985                 priv->stats.tx_dropped++;
 986                 priv->stats.tx_errors++;
 987                 priv->stats.tx_carrier_errors++;
 988                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 989                                         goto done;
 990         }
 991
 992         dev->trans_start = jiffies;
 993         if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) {
 994                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 995                         "%s(%s): device error - dropped",
 996                                         CTCM_FUNTAIL, dev->name);
 997                 dev_kfree_skb_any(skb);
 998                 priv->stats.tx_dropped++;
 999                 priv->stats.tx_errors++;
1000                 priv->stats.tx_carrier_errors++;
1001                 ctcm_clear_busy(dev);
1002                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1003                                         goto done;
1004         }
1005         ctcm_clear_busy(dev);
1006 done:
1007         if (do_debug)
1008                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1009
1010         return NETDEV_TX_OK;    /* handle freeing of skb here */
1011 }
1012
1013
1014 /**
1015  * Sets MTU of an interface.
1016  *
1017  *  dev         Pointer to interface struct.
1018  *  new_mtu     The new MTU to use for this interface.
1019  *
1020  * returns 0 on success, -EINVAL if MTU is out of valid range.
1021  *         (valid range is 576 .. 65527). If VM is on the
1022  *         remote side, maximum MTU is 32760, however this is
1023  *         not checked here.
1024  */
1025 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1026 {
1027         struct ctcm_priv *priv;
1028         int max_bufsize;
1029
1030         if (new_mtu < 576 || new_mtu > 65527)
1031                 return -EINVAL;
1032
1033         priv = dev->ml_priv;
1034         max_bufsize = priv->channel[READ]->max_bufsize;
1035
1036         if (IS_MPC(priv)) {
1037                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1038                         return -EINVAL;
1039                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1040         } else {
1041                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1042                         return -EINVAL;
1043                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1044         }
1045         dev->mtu = new_mtu;
1046         return 0;
1047 }
1048
1049 /**
1050  * Returns interface statistics of a device.
1051  *
1052  *  dev         Pointer to interface struct.
1053  *
1054  * returns Pointer to stats struct of this interface.
1055  */
1056 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1057 {
1058         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1059 }
1060
1061 static void ctcm_free_netdevice(struct net_device *dev)
1062 {
1063         struct ctcm_priv *priv;
1064         struct mpc_group *grp;
1065
1066         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1067                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1068         priv = dev->ml_priv;
1069         if (priv) {
1070                 grp = priv->mpcg;
1071                 if (grp) {
1072                         if (grp->fsm)
1073                                 kfree_fsm(grp->fsm);
1074                         if (grp->xid_skb)
1075                                 dev_kfree_skb(grp->xid_skb);
1076                         if (grp->rcvd_xid_skb)
1077                                 dev_kfree_skb(grp->rcvd_xid_skb);
1078                         tasklet_kill(&grp->mpc_tasklet2);
1079                         kfree(grp);
1080                         priv->mpcg = NULL;
1081                 }
1082                 if (priv->fsm) {
1083                         kfree_fsm(priv->fsm);
1084                         priv->fsm = NULL;
1085                 }
1086                 kfree(priv->xid);
1087                 priv->xid = NULL;
1088         /*
1089          * Note: kfree(priv); is done in "opposite" function of
1090          * allocator function probe_device which is remove_device.
1091          */
1092         }
1093 #ifdef MODULE
1094         free_netdev(dev);
1095 #endif
1096 }
1097
1098 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1099
1100 static const struct net_device_ops ctcm_netdev_ops = {
1101         .ndo_open               = ctcm_open,
1102         .ndo_stop               = ctcm_close,
1103         .ndo_get_stats          = ctcm_stats,
1104         .ndo_change_mtu         = ctcm_change_mtu,
1105         .ndo_start_xmit         = ctcm_tx,
1106 };
1107
1108 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1109         .ndo_open               = ctcm_open,
1110         .ndo_stop               = ctcm_close,
1111         .ndo_get_stats          = ctcm_stats,
1112         .ndo_change_mtu         = ctcm_change_mtu,
1113         .ndo_start_xmit         = ctcmpc_tx,
1114 };
1115
1116 void static ctcm_dev_setup(struct net_device *dev)
1117 {
1118         dev->type = ARPHRD_SLIP;
1119         dev->tx_queue_len = 100;
1120         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1121 }
1122
1123 /*
1124  * Initialize everything of the net device except the name and the
1125  * channel structs.
1126  */
1127 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1128 {
1129         struct net_device *dev;
1130         struct mpc_group *grp;
1131         if (!priv)
1132                 return NULL;
1133
1134         if (IS_MPC(priv))
1135                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1136         else
1137                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1138
1139         if (!dev) {
1140                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1141                         "%s: MEMORY allocation ERROR",
1142                         CTCM_FUNTAIL);
1143                 return NULL;
1144         }
1145         dev->ml_priv = priv;
1146         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1147                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1148                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1149         if (priv->fsm == NULL) {
1150                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1151                 kfree(dev);
1152                 return NULL;
1153         }
1154         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1155         fsm_settimer(priv->fsm, &priv->restart_timer);
1156
1157         if (IS_MPC(priv)) {
1158                 /*  MPC Group Initializations  */
1159                 grp = ctcmpc_init_mpc_group(priv);
1160                 if (grp == NULL) {
1161                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1162                         kfree(dev);
1163                         return NULL;
1164                 }
1165                 tasklet_init(&grp->mpc_tasklet2,
1166                                 mpc_group_ready, (unsigned long)dev);
1167                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1168                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1169
1170                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1171                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1172                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1173         } else {
1174                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1175                 dev->netdev_ops = &ctcm_netdev_ops;
1176                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1177         }
1178
1179         CTCMY_DBF_DEV(SETUP, dev, "finished");
1180
1181         return dev;
1182 }
1183
1184 /**
1185  * Main IRQ handler.
1186  *
1187  *  cdev        The ccw_device the interrupt is for.
1188  *  intparm     interruption parameter.
1189  *  irb         interruption response block.
1190  */
1191 static void ctcm_irq_handler(struct ccw_device *cdev,
1192                                 unsigned long intparm, struct irb *irb)
1193 {
1194         struct channel          *ch;
1195         struct net_device       *dev;
1196         struct ctcm_priv        *priv;
1197         struct ccwgroup_device  *cgdev;
1198         int cstat;
1199         int dstat;
1200
1201         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1202                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1203
1204         if (ctcm_check_irb_error(cdev, irb))
1205                 return;
1206
1207         cgdev = dev_get_drvdata(&cdev->dev);
1208
1209         cstat = irb->scsw.cmd.cstat;
1210         dstat = irb->scsw.cmd.dstat;
1211
1212         /* Check for unsolicited interrupts. */
1213         if (cgdev == NULL) {
1214                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1215                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1216                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1217                 dev_warn(&cdev->dev,
1218                         "The adapter received a non-specific IRQ\n");
1219                 return;
1220         }
1221
1222         priv = dev_get_drvdata(&cgdev->dev);
1223
1224         /* Try to extract channel from driver data. */
1225         if (priv->channel[READ]->cdev == cdev)
1226                 ch = priv->channel[READ];
1227         else if (priv->channel[WRITE]->cdev == cdev)
1228                 ch = priv->channel[WRITE];
1229         else {
1230                 dev_err(&cdev->dev,
1231                         "%s: Internal error: Can't determine channel for "
1232                         "interrupt device %s\n",
1233                         __func__, dev_name(&cdev->dev));
1234                         /* Explain: inconsistent internal structures */
1235                 return;
1236         }
1237
1238         dev = ch->netdev;
1239         if (dev == NULL) {
1240                 dev_err(&cdev->dev,
1241                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1242                         __func__, ch);
1243                         /* Explain: inconsistent internal structures */
1244                 return;
1245         }
1246
1247         /* Copy interruption response block. */
1248         memcpy(ch->irb, irb, sizeof(struct irb));
1249
1250         /* Issue error message and return on subchannel error code */
1251         if (irb->scsw.cmd.cstat) {
1252                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1253                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1254                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1255                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1256                 dev_warn(&cdev->dev,
1257                                 "A check occurred on the subchannel\n");
1258                 return;
1259         }
1260
1261         /* Check the reason-code of a unit check */
1262         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1263                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1264                         /* print it only once */
1265                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1266                                 "%s(%s): sense=%02x, ds=%02x",
1267                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1268                 ccw_unit_check(ch, irb->ecw[0]);
1269                 return;
1270         }
1271         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1272                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1273                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1274                 else
1275                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1276                 return;
1277         }
1278         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1279                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1280                 return;
1281         }
1282         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1283             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1284             (irb->scsw.cmd.stctl ==
1285              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1286                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1287         else
1288                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1289
1290 }
1291
1292 /**
1293  * Add ctcm specific attributes.
1294  * Add ctcm private data.
1295  *
1296  *  cgdev       pointer to ccwgroup_device just added
1297  *
1298  * returns 0 on success, !0 on failure.
1299  */
1300 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1301 {
1302         struct ctcm_priv *priv;
1303         int rc;
1304
1305         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1306                         "%s %p",
1307                         __func__, cgdev);
1308
1309         if (!get_device(&cgdev->dev))
1310                 return -ENODEV;
1311
1312         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1313         if (!priv) {
1314                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1315                         "%s: memory allocation failure",
1316                         CTCM_FUNTAIL);
1317                 put_device(&cgdev->dev);
1318                 return -ENOMEM;
1319         }
1320
1321         rc = ctcm_add_files(&cgdev->dev);
1322         if (rc) {
1323                 kfree(priv);
1324                 put_device(&cgdev->dev);
1325                 return rc;
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
1332         return 0;
1333 }
1334
1335 /**
1336  * Add a new channel to the list of channels.
1337  * Keeps the channel list sorted.
1338  *
1339  *  cdev        The ccw_device to be added.
1340  *  type        The type class of the new channel.
1341  *  priv        Points to the private data of the ccwgroup_device.
1342  *
1343  * returns 0 on success, !0 on error.
1344  */
1345 static int add_channel(struct ccw_device *cdev, enum channel_types type,
1346                                 struct ctcm_priv *priv)
1347 {
1348         struct channel **c = &channels;
1349         struct channel *ch;
1350         int ccw_num;
1351         int rc = 0;
1352
1353         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1354                 "%s(%s), type %d, proto %d",
1355                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1356
1357         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1358         if (ch == NULL)
1359                 return -ENOMEM;
1360
1361         ch->protocol = priv->protocol;
1362         if (IS_MPC(priv)) {
1363                 ch->discontact_th = (struct th_header *)
1364                                 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 = (struct ccw1 *)
1379                 kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1380         if (ch->ccw == NULL)
1381                                         goto nomem_return;
1382
1383         ch->cdev = cdev;
1384         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1385         ch->type = type;
1386
1387         /**
1388          * "static" ccws are used in the following way:
1389          *
1390          * ccw[0..2] (Channel program for generic I/O):
1391          *           0: prepare
1392          *           1: read or write (depending on direction) with fixed
1393          *              buffer (idal allocated once when buffer is allocated)
1394          *           2: nop
1395          * ccw[3..5] (Channel program for direct write of packets)
1396          *           3: prepare
1397          *           4: write (idal allocated on every write).
1398          *           5: nop
1399          * ccw[6..7] (Channel program for initial channel setup):
1400          *           6: set extended mode
1401          *           7: nop
1402          *
1403          * ch->ccw[0..5] are initialized in ch_action_start because
1404          * the channel's direction is yet unknown here.
1405          *
1406          * ccws used for xid2 negotiations
1407          *  ch-ccw[8-14] need to be used for the XID exchange either
1408          *    X side XID2 Processing
1409          *       8:  write control
1410          *       9:  write th
1411          *           10: write XID
1412          *           11: read th from secondary
1413          *           12: read XID   from secondary
1414          *           13: read 4 byte ID
1415          *           14: nop
1416          *    Y side XID Processing
1417          *           8:  sense
1418          *       9:  read th
1419          *           10: read XID
1420          *           11: write th
1421          *           12: write XID
1422          *           13: write 4 byte ID
1423          *           14: nop
1424          *
1425          *  ccws used for double noop due to VM timing issues
1426          *  which result in unrecoverable Busy on channel
1427          *       15: nop
1428          *       16: nop
1429          */
1430         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1431         ch->ccw[6].flags        = CCW_FLAG_SLI;
1432
1433         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1434         ch->ccw[7].flags        = CCW_FLAG_SLI;
1435
1436         if (IS_MPC(priv)) {
1437                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1438                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1439                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1440                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1441
1442                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1443                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1444
1445                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1446                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1447                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1448                                 mpc_ch_fsm_len, GFP_KERNEL);
1449         } else {
1450                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1451                                 ctc_ch_event_names, CTC_NR_STATES,
1452                                 CTC_NR_EVENTS, ch_fsm,
1453                                 ch_fsm_len, GFP_KERNEL);
1454         }
1455         if (ch->fsm == NULL)
1456                                 goto free_return;
1457
1458         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1459
1460         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1461         if (ch->irb == NULL)
1462                                 goto nomem_return;
1463
1464         while (*c && ctcm_less_than((*c)->id, ch->id))
1465                 c = &(*c)->next;
1466
1467         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1468                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1469                                 "%s (%s) already in list, using old entry",
1470                                 __func__, (*c)->id);
1471
1472                                 goto free_return;
1473         }
1474
1475         spin_lock_init(&ch->collect_lock);
1476
1477         fsm_settimer(ch->fsm, &ch->timer);
1478         skb_queue_head_init(&ch->io_queue);
1479         skb_queue_head_init(&ch->collect_queue);
1480
1481         if (IS_MPC(priv)) {
1482                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1483                 skb_queue_head_init(&ch->sweep_queue);
1484         }
1485         ch->next = *c;
1486         *c = ch;
1487         return 0;
1488
1489 nomem_return:
1490         rc = -ENOMEM;
1491
1492 free_return:    /* note that all channel pointers are 0 or valid */
1493         kfree(ch->ccw);
1494         kfree(ch->discontact_th);
1495         kfree_fsm(ch->fsm);
1496         kfree(ch->irb);
1497         kfree(ch);
1498         return rc;
1499 }
1500
1501 /*
1502  * Return type of a detected device.
1503  */
1504 static enum channel_types get_channel_type(struct ccw_device_id *id)
1505 {
1506         enum channel_types type;
1507         type = (enum channel_types)id->driver_info;
1508
1509         if (type == channel_type_ficon)
1510                 type = channel_type_escon;
1511
1512         return type;
1513 }
1514
1515 /**
1516  *
1517  * Setup an interface.
1518  *
1519  *  cgdev       Device to be setup.
1520  *
1521  * returns 0 on success, !0 on failure.
1522  */
1523 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1524 {
1525         char read_id[CTCM_ID_SIZE];
1526         char write_id[CTCM_ID_SIZE];
1527         int direction;
1528         enum channel_types type;
1529         struct ctcm_priv *priv;
1530         struct net_device *dev;
1531         struct ccw_device *cdev0;
1532         struct ccw_device *cdev1;
1533         struct channel *readc;
1534         struct channel *writec;
1535         int ret;
1536         int result;
1537
1538         priv = dev_get_drvdata(&cgdev->dev);
1539         if (!priv) {
1540                 result = -ENODEV;
1541                 goto out_err_result;
1542         }
1543
1544         cdev0 = cgdev->cdev[0];
1545         cdev1 = cgdev->cdev[1];
1546
1547         type = get_channel_type(&cdev0->id);
1548
1549         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1550         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1551
1552         ret = add_channel(cdev0, type, priv);
1553         if (ret) {
1554                 result = ret;
1555                 goto out_err_result;
1556         }
1557         ret = add_channel(cdev1, type, priv);
1558         if (ret) {
1559                 result = ret;
1560                 goto out_remove_channel1;
1561         }
1562
1563         ret = ccw_device_set_online(cdev0);
1564         if (ret != 0) {
1565                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1566                         "%s(%s) set_online rc=%d",
1567                                 CTCM_FUNTAIL, read_id, ret);
1568                 result = -EIO;
1569                 goto out_remove_channel2;
1570         }
1571
1572         ret = ccw_device_set_online(cdev1);
1573         if (ret != 0) {
1574                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1575                         "%s(%s) set_online rc=%d",
1576                                 CTCM_FUNTAIL, write_id, ret);
1577
1578                 result = -EIO;
1579                 goto out_ccw1;
1580         }
1581
1582         dev = ctcm_init_netdevice(priv);
1583         if (dev == NULL) {
1584                 result = -ENODEV;
1585                 goto out_ccw2;
1586         }
1587
1588         for (direction = READ; direction <= WRITE; direction++) {
1589                 priv->channel[direction] =
1590                     channel_get(type, direction == READ ? read_id : write_id,
1591                                 direction);
1592                 if (priv->channel[direction] == NULL) {
1593                         if (direction == WRITE)
1594                                 channel_free(priv->channel[READ]);
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         if (ctcm_add_attributes(&cgdev->dev)) {
1610                 result = -ENODEV;
1611                 goto out_unregister;
1612         }
1613
1614         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1615
1616         dev_info(&dev->dev,
1617                 "setup OK : r/w = %s/%s, protocol : %d\n",
1618                         priv->channel[READ]->id,
1619                         priv->channel[WRITE]->id, priv->protocol);
1620
1621         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1622                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1623                         priv->channel[READ]->id,
1624                         priv->channel[WRITE]->id, priv->protocol);
1625
1626         return 0;
1627 out_unregister:
1628         unregister_netdev(dev);
1629 out_dev:
1630         ctcm_free_netdevice(dev);
1631 out_ccw2:
1632         ccw_device_set_offline(cgdev->cdev[1]);
1633 out_ccw1:
1634         ccw_device_set_offline(cgdev->cdev[0]);
1635 out_remove_channel2:
1636         readc = channel_get(type, read_id, READ);
1637         channel_remove(readc);
1638 out_remove_channel1:
1639         writec = channel_get(type, write_id, WRITE);
1640         channel_remove(writec);
1641 out_err_result:
1642         return result;
1643 }
1644
1645 /**
1646  * Shutdown an interface.
1647  *
1648  *  cgdev       Device to be shut down.
1649  *
1650  * returns 0 on success, !0 on failure.
1651  */
1652 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1653 {
1654         struct ctcm_priv *priv;
1655         struct net_device *dev;
1656
1657         priv = dev_get_drvdata(&cgdev->dev);
1658         if (!priv)
1659                 return -ENODEV;
1660
1661         if (priv->channel[READ]) {
1662                 dev = priv->channel[READ]->netdev;
1663                 CTCM_DBF_DEV(SETUP, dev, "");
1664                 /* Close the device */
1665                 ctcm_close(dev);
1666                 dev->flags &= ~IFF_RUNNING;
1667                 ctcm_remove_attributes(&cgdev->dev);
1668                 channel_free(priv->channel[READ]);
1669         } else
1670                 dev = NULL;
1671
1672         if (priv->channel[WRITE])
1673                 channel_free(priv->channel[WRITE]);
1674
1675         if (dev) {
1676                 unregister_netdev(dev);
1677                 ctcm_free_netdevice(dev);
1678         }
1679
1680         if (priv->fsm)
1681                 kfree_fsm(priv->fsm);
1682
1683         ccw_device_set_offline(cgdev->cdev[1]);
1684         ccw_device_set_offline(cgdev->cdev[0]);
1685
1686         if (priv->channel[READ])
1687                 channel_remove(priv->channel[READ]);
1688         if (priv->channel[WRITE])
1689                 channel_remove(priv->channel[WRITE]);
1690         priv->channel[READ] = priv->channel[WRITE] = NULL;
1691
1692         return 0;
1693
1694 }
1695
1696
1697 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1698 {
1699         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1700
1701         BUG_ON(priv == NULL);
1702
1703         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1704                         "removing device %p, proto : %d",
1705                         cgdev, priv->protocol);
1706
1707         if (cgdev->state == CCWGROUP_ONLINE)
1708                 ctcm_shutdown_device(cgdev);
1709         ctcm_remove_files(&cgdev->dev);
1710         dev_set_drvdata(&cgdev->dev, NULL);
1711         kfree(priv);
1712         put_device(&cgdev->dev);
1713 }
1714
1715 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1716 {
1717         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1718
1719         if (gdev->state == CCWGROUP_OFFLINE)
1720                 return 0;
1721         netif_device_detach(priv->channel[READ]->netdev);
1722         ctcm_close(priv->channel[READ]->netdev);
1723         ccw_device_set_offline(gdev->cdev[1]);
1724         ccw_device_set_offline(gdev->cdev[0]);
1725         return 0;
1726 }
1727
1728 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1729 {
1730         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1731         int rc;
1732
1733         if (gdev->state == CCWGROUP_OFFLINE)
1734                 return 0;
1735         rc = ccw_device_set_online(gdev->cdev[1]);
1736         if (rc)
1737                 goto err_out;
1738         rc = ccw_device_set_online(gdev->cdev[0]);
1739         if (rc)
1740                 goto err_out;
1741         ctcm_open(priv->channel[READ]->netdev);
1742 err_out:
1743         netif_device_attach(priv->channel[READ]->netdev);
1744         return rc;
1745 }
1746
1747 static struct ccwgroup_driver ctcm_group_driver = {
1748         .owner       = THIS_MODULE,
1749         .name        = CTC_DRIVER_NAME,
1750         .max_slaves  = 2,
1751         .driver_id   = 0xC3E3C3D4,      /* CTCM */
1752         .probe       = ctcm_probe_device,
1753         .remove      = ctcm_remove_device,
1754         .set_online  = ctcm_new_device,
1755         .set_offline = ctcm_shutdown_device,
1756         .freeze      = ctcm_pm_suspend,
1757         .thaw        = ctcm_pm_resume,
1758         .restore     = ctcm_pm_resume,
1759 };
1760
1761
1762 /*
1763  * Module related routines
1764  */
1765
1766 /*
1767  * Prepare to be unloaded. Free IRQ's and release all resources.
1768  * This is called just before this module is unloaded. It is
1769  * not called, if the usage count is !0, so we don't need to check
1770  * for that.
1771  */
1772 static void __exit ctcm_exit(void)
1773 {
1774         unregister_cu3088_discipline(&ctcm_group_driver);
1775         ctcm_unregister_dbf_views();
1776         pr_info("CTCM driver unloaded\n");
1777 }
1778
1779 /*
1780  * Print Banner.
1781  */
1782 static void print_banner(void)
1783 {
1784         pr_info("CTCM driver initialized\n");
1785 }
1786
1787 /**
1788  * Initialize module.
1789  * This is called just after the module is loaded.
1790  *
1791  * returns 0 on success, !0 on error.
1792  */
1793 static int __init ctcm_init(void)
1794 {
1795         int ret;
1796
1797         channels = NULL;
1798
1799         ret = ctcm_register_dbf_views();
1800         if (ret) {
1801                 return ret;
1802         }
1803         ret = register_cu3088_discipline(&ctcm_group_driver);
1804         if (ret) {
1805                 ctcm_unregister_dbf_views();
1806                 pr_err("%s / register_cu3088_discipline failed, ret = %d\n",
1807                         __func__, ret);
1808                 return ret;
1809         }
1810         print_banner();
1811         return ret;
1812 }
1813
1814 module_init(ctcm_init);
1815 module_exit(ctcm_exit);
1816
1817 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1818 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1819 MODULE_LICENSE("GPL");
1820