drivers/s390/net/ctcm_main.c

   1 /*
   2  * Copyright IBM Corp. 2001, 2009
   3  * Author(s):
   4  *      Original CTC driver(s):
   5  *              Fritz Elfert (felfert@millenux.com)
   6  *              Dieter Wellerdiek (wel@de.ibm.com)
   7  *              Martin Schwidefsky (schwidefsky@de.ibm.com)
   8  *              Denis Joseph Barrow (barrow_dj@yahoo.com)
   9  *              Jochen Roehrig (roehrig@de.ibm.com)
  10  *              Cornelia Huck <cornelia.huck@de.ibm.com>
  11  *      MPC additions:
  12  *              Belinda Thompson (belindat@us.ibm.com)
  13  *              Andy Richter (richtera@us.ibm.com)
  14  *      Revived by:
  15  *              Peter Tiedemann (ptiedem@de.ibm.com)
  16  */
  17
  18 #undef DEBUG
  19 #undef DEBUGDATA
  20 #undef DEBUGCCW
  21
  22 #define KMSG_COMPONENT "ctcm"
  23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  24
  25 #include <linux/module.h>
  26 #include <linux/init.h>
  27 #include <linux/kernel.h>
  28 #include <linux/slab.h>
  29 #include <linux/errno.h>
  30 #include <linux/types.h>
  31 #include <linux/interrupt.h>
  32 #include <linux/timer.h>
  33 #include <linux/bitops.h>
  34
  35 #include <linux/signal.h>
  36 #include <linux/string.h>
  37
  38 #include <linux/ip.h>
  39 #include <linux/if_arp.h>
  40 #include <linux/tcp.h>
  41 #include <linux/skbuff.h>
  42 #include <linux/ctype.h>
  43 #include <net/dst.h>
  44
  45 #include <linux/io.h>
  46 #include <asm/ccwdev.h>
  47 #include <asm/ccwgroup.h>
  48 #include <linux/uaccess.h>
  49
  50 #include <asm/idals.h>
  51
  52 #include "ctcm_fsms.h"
  53 #include "ctcm_main.h"
  54
  55 /* Some common global variables */
  56
  57 /**
  58  * The root device for ctcm group devices
  59  */
  60 static struct device *ctcm_root_dev;
  61
  62 /*
  63  * Linked list of all detected channels.
  64  */
  65 struct channel *channels;
  66
  67 /**
  68  * Unpack a just received skb and hand it over to
  69  * upper layers.
  70  *
  71  *  ch          The channel where this skb has been received.
  72  *  pskb        The received skb.
  73  */
  74 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  75 {
  76         struct net_device *dev = ch->netdev;
  77         struct ctcm_priv *priv = dev->ml_priv;
  78         __u16 len = *((__u16 *) pskb->data);
  79
  80         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  81         skb_pull(pskb, 2);
  82         pskb->dev = dev;
  83         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  84         while (len > 0) {
  85                 struct sk_buff *skb;
  86                 int skblen;
  87                 struct ll_header *header = (struct ll_header *)pskb->data;
  88
  89                 skb_pull(pskb, LL_HEADER_LENGTH);
  90                 if ((ch->protocol == CTCM_PROTO_S390) &&
  91                     (header->type != ETH_P_IP)) {
  92                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  93                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  94                                 /*
  95                                  * Check packet type only if we stick strictly
  96                                  * to S/390's protocol of OS390. This only
  97                                  * supports IP. Otherwise allow any packet
  98                                  * type.
  99                                  */
 100                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 101                                         "%s(%s): Illegal packet type 0x%04x"
 102                                         " - dropping",
 103                                         CTCM_FUNTAIL, dev->name, header->type);
 104                         }
 105                         priv->stats.rx_dropped++;
 106                         priv->stats.rx_frame_errors++;
 107                         return;
 108                 }
 109                 pskb->protocol = ntohs(header->type);
 110                 if ((header->length <= LL_HEADER_LENGTH) ||
 111                     (len <= LL_HEADER_LENGTH)) {
 112                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 113                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 114                                         "%s(%s): Illegal packet size %d(%d,%d)"
 115                                         "- dropping",
 116                                         CTCM_FUNTAIL, dev->name,
 117                                         header->length, dev->mtu, len);
 118                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 119                         }
 120
 121                         priv->stats.rx_dropped++;
 122                         priv->stats.rx_length_errors++;
 123                         return;
 124                 }
 125                 header->length -= LL_HEADER_LENGTH;
 126                 len -= LL_HEADER_LENGTH;
 127                 if ((header->length > skb_tailroom(pskb)) ||
 128                         (header->length > len)) {
 129                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 130                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 131                                         "%s(%s): Packet size %d (overrun)"
 132                                         " - dropping", CTCM_FUNTAIL,
 133                                                 dev->name, header->length);
 134                                 ch->logflags |= LOG_FLAG_OVERRUN;
 135                         }
 136
 137                         priv->stats.rx_dropped++;
 138                         priv->stats.rx_length_errors++;
 139                         return;
 140                 }
 141                 skb_put(pskb, header->length);
 142                 skb_reset_mac_header(pskb);
 143                 len -= header->length;
 144                 skb = dev_alloc_skb(pskb->len);
 145                 if (!skb) {
 146                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 147                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 148                                         "%s(%s): MEMORY allocation error",
 149                                                 CTCM_FUNTAIL, dev->name);
 150                                 ch->logflags |= LOG_FLAG_NOMEM;
 151                         }
 152                         priv->stats.rx_dropped++;
 153                         return;
 154                 }
 155                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 156                                           pskb->len);
 157                 skb_reset_mac_header(skb);
 158                 skb->dev = pskb->dev;
 159                 skb->protocol = pskb->protocol;
 160                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 161                 skblen = skb->len;
 162                 /*
 163                  * reset logflags
 164                  */
 165                 ch->logflags = 0;
 166                 priv->stats.rx_packets++;
 167                 priv->stats.rx_bytes += skblen;
 168                 netif_rx_ni(skb);
 169                 if (len > 0) {
 170                         skb_pull(pskb, header->length);
 171                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 172                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 173                                         "Overrun in ctcm_unpack_skb");
 174                                 ch->logflags |= LOG_FLAG_OVERRUN;
 175                                 return;
 176                         }
 177                         skb_put(pskb, LL_HEADER_LENGTH);
 178                 }
 179         }
 180 }
 181
 182 /**
 183  * Release a specific channel in the channel list.
 184  *
 185  *  ch          Pointer to channel struct to be released.
 186  */
 187 static void channel_free(struct channel *ch)
 188 {
 189         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 190         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 191         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 192 }
 193
 194 /**
 195  * Remove a specific channel in the channel list.
 196  *
 197  *  ch          Pointer to channel struct to be released.
 198  */
 199 static void channel_remove(struct channel *ch)
 200 {
 201         struct channel **c = &channels;
 202         char chid[CTCM_ID_SIZE+1];
 203         int ok = 0;
 204
 205         if (ch == NULL)
 206                 return;
 207         else
 208                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 209
 210         channel_free(ch);
 211         while (*c) {
 212                 if (*c == ch) {
 213                         *c = ch->next;
 214                         fsm_deltimer(&ch->timer);
 215                         if (IS_MPC(ch))
 216                                 fsm_deltimer(&ch->sweep_timer);
 217
 218                         kfree_fsm(ch->fsm);
 219                         clear_normalized_cda(&ch->ccw[4]);
 220                         if (ch->trans_skb != NULL) {
 221                                 clear_normalized_cda(&ch->ccw[1]);
 222                                 dev_kfree_skb_any(ch->trans_skb);
 223                         }
 224                         if (IS_MPC(ch)) {
 225                                 tasklet_kill(&ch->ch_tasklet);
 226                                 tasklet_kill(&ch->ch_disc_tasklet);
 227                                 kfree(ch->discontact_th);
 228                         }
 229                         kfree(ch->ccw);
 230                         kfree(ch->irb);
 231                         kfree(ch);
 232                         ok = 1;
 233                         break;
 234                 }
 235                 c = &((*c)->next);
 236         }
 237
 238         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 239                         chid, ok ? "OK" : "failed");
 240 }
 241
 242 /**
 243  * Get a specific channel from the channel list.
 244  *
 245  *  type        Type of channel we are interested in.
 246  *  id          Id of channel we are interested in.
 247  *  direction   Direction we want to use this channel for.
 248  *
 249  * returns Pointer to a channel or NULL if no matching channel available.
 250  */
 251 static struct channel *channel_get(enum ctcm_channel_types type,
 252                                         char *id, int direction)
 253 {
 254         struct channel *ch = channels;
 255
 256         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 257                 ch = ch->next;
 258         if (!ch) {
 259                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 260                                 "%s(%d, %s, %d) not found in channel list\n",
 261                                 CTCM_FUNTAIL, type, id, direction);
 262         } else {
 263                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 264                         ch = NULL;
 265                 else {
 266                         ch->flags |= CHANNEL_FLAGS_INUSE;
 267                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 268                         ch->flags |= (direction == CTCM_WRITE)
 269                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 270                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 271                 }
 272         }
 273         return ch;
 274 }
 275
 276 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 277 {
 278         if (!IS_ERR(irb))
 279                 return 0;
 280
 281         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 282                         "irb error %ld on device %s\n",
 283                                 PTR_ERR(irb), dev_name(&cdev->dev));
 284
 285         switch (PTR_ERR(irb)) {
 286         case -EIO:
 287                 dev_err(&cdev->dev,
 288                         "An I/O-error occurred on the CTCM device\n");
 289                 break;
 290         case -ETIMEDOUT:
 291                 dev_err(&cdev->dev,
 292                         "An adapter hardware operation timed out\n");
 293                 break;
 294         default:
 295                 dev_err(&cdev->dev,
 296                         "An error occurred on the adapter hardware\n");
 297         }
 298         return PTR_ERR(irb);
 299 }
 300
 301
 302 /**
 303  * Check sense of a unit check.
 304  *
 305  *  ch          The channel, the sense code belongs to.
 306  *  sense       The sense code to inspect.
 307  */
 308 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
 309 {
 310         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 311                         "%s(%s): %02x",
 312                                 CTCM_FUNTAIL, ch->id, sense);
 313
 314         if (sense & SNS0_INTERVENTION_REQ) {
 315                 if (sense & 0x01) {
 316                         if (ch->sense_rc != 0x01) {
 317                                 pr_notice(
 318                                         "%s: The communication peer has "
 319                                         "disconnected\n", ch->id);
 320                                 ch->sense_rc = 0x01;
 321                         }
 322                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 323                 } else {
 324                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 325                                 pr_notice(
 326                                         "%s: The remote operating system is "
 327                                         "not available\n", ch->id);
 328                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 329                         }
 330                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 331                 }
 332         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 333                 if (sense & SNS0_BUS_OUT_CHECK) {
 334                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 335                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 336                                         "%s(%s): remote HW error %02x",
 337                                                 CTCM_FUNTAIL, ch->id, sense);
 338                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 339                         }
 340                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 341                 } else {
 342                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 343                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 344                                         "%s(%s): remote read parity error %02x",
 345                                                 CTCM_FUNTAIL, ch->id, sense);
 346                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 347                         }
 348                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 349                 }
 350         } else if (sense & SNS0_BUS_OUT_CHECK) {
 351                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 352                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 353                                 "%s(%s): BUS OUT error %02x",
 354                                         CTCM_FUNTAIL, ch->id, sense);
 355                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 356                 }
 357                 if (sense & 0x04)       /* data-streaming timeout */
 358                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 359                 else                    /* Data-transfer parity error */
 360                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 361         } else if (sense & SNS0_CMD_REJECT) {
 362                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 363                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 364                                 "%s(%s): Command rejected",
 365                                                 CTCM_FUNTAIL, ch->id);
 366                         ch->sense_rc = SNS0_CMD_REJECT;
 367                 }
 368         } else if (sense == 0) {
 369                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 370                         "%s(%s): Unit check ZERO",
 371                                         CTCM_FUNTAIL, ch->id);
 372                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 373         } else {
 374                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 375                         "%s(%s): Unit check code %02x unknown",
 376                                         CTCM_FUNTAIL, ch->id, sense);
 377                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 378         }
 379 }
 380
 381 int ctcm_ch_alloc_buffer(struct channel *ch)
 382 {
 383         clear_normalized_cda(&ch->ccw[1]);
 384         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 385         if (ch->trans_skb == NULL) {
 386                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 387                         "%s(%s): %s trans_skb allocation error",
 388                         CTCM_FUNTAIL, ch->id,
 389                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 390                                 "RX" : "TX");
 391                 return -ENOMEM;
 392         }
 393
 394         ch->ccw[1].count = ch->max_bufsize;
 395         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 396                 dev_kfree_skb(ch->trans_skb);
 397                 ch->trans_skb = NULL;
 398                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 399                         "%s(%s): %s set norm_cda failed",
 400                         CTCM_FUNTAIL, ch->id,
 401                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 402                                 "RX" : "TX");
 403                 return -ENOMEM;
 404         }
 405
 406         ch->ccw[1].count = 0;
 407         ch->trans_skb_data = ch->trans_skb->data;
 408         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 409         return 0;
 410 }
 411
 412 /*
 413  * Interface API for upper network layers
 414  */
 415
 416 /**
 417  * Open an interface.
 418  * Called from generic network layer when ifconfig up is run.
 419  *
 420  *  dev         Pointer to interface struct.
 421  *
 422  * returns 0 on success, -ERRNO on failure. (Never fails.)
 423  */
 424 int ctcm_open(struct net_device *dev)
 425 {
 426         struct ctcm_priv *priv = dev->ml_priv;
 427
 428         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 429         if (!IS_MPC(priv))
 430                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 431         return 0;
 432 }
 433
 434 /**
 435  * Close an interface.
 436  * Called from generic network layer when ifconfig down is run.
 437  *
 438  *  dev         Pointer to interface struct.
 439  *
 440  * returns 0 on success, -ERRNO on failure. (Never fails.)
 441  */
 442 int ctcm_close(struct net_device *dev)
 443 {
 444         struct ctcm_priv *priv = dev->ml_priv;
 445
 446         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 447         if (!IS_MPC(priv))
 448                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 449         return 0;
 450 }
 451
 452
 453 /**
 454  * Transmit a packet.
 455  * This is a helper function for ctcm_tx().
 456  *
 457  *  ch          Channel to be used for sending.
 458  *  skb         Pointer to struct sk_buff of packet to send.
 459  *            The linklevel header has already been set up
 460  *            by ctcm_tx().
 461  *
 462  * returns 0 on success, -ERRNO on failure. (Never fails.)
 463  */
 464 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 465 {
 466         unsigned long saveflags;
 467         struct ll_header header;
 468         int rc = 0;
 469         __u16 block_len;
 470         int ccw_idx;
 471         struct sk_buff *nskb;
 472         unsigned long hi;
 473
 474         /* we need to acquire the lock for testing the state
 475          * otherwise we can have an IRQ changing the state to
 476          * TXIDLE after the test but before acquiring the lock.
 477          */
 478         spin_lock_irqsave(&ch->collect_lock, saveflags);
 479         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 480                 int l = skb->len + LL_HEADER_LENGTH;
 481
 482                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 483                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 484                         return -EBUSY;
 485                 } else {
 486                         atomic_inc(&skb->users);
 487                         header.length = l;
 488                         header.type = skb->protocol;
 489                         header.unused = 0;
 490                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 491                                LL_HEADER_LENGTH);
 492                         skb_queue_tail(&ch->collect_queue, skb);
 493                         ch->collect_len += l;
 494                 }
 495                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 496                                 goto done;
 497         }
 498         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 499         /*
 500          * Protect skb against beeing free'd by upper
 501          * layers.
 502          */
 503         atomic_inc(&skb->users);
 504         ch->prof.txlen += skb->len;
 505         header.length = skb->len + LL_HEADER_LENGTH;
 506         header.type = skb->protocol;
 507         header.unused = 0;
 508         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 509         block_len = skb->len + 2;
 510         *((__u16 *)skb_push(skb, 2)) = block_len;
 511
 512         /*
 513          * IDAL support in CTCM is broken, so we have to
 514          * care about skb's above 2G ourselves.
 515          */
 516         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 517         if (hi) {
 518                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 519                 if (!nskb) {
 520                         atomic_dec(&skb->users);
 521                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 522                         ctcm_clear_busy(ch->netdev);
 523                         return -ENOMEM;
 524                 } else {
 525                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 526                         atomic_inc(&nskb->users);
 527                         atomic_dec(&skb->users);
 528                         dev_kfree_skb_irq(skb);
 529                         skb = nskb;
 530                 }
 531         }
 532
 533         ch->ccw[4].count = block_len;
 534         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 535                 /*
 536                  * idal allocation failed, try via copying to
 537                  * trans_skb. trans_skb usually has a pre-allocated
 538                  * idal.
 539                  */
 540                 if (ctcm_checkalloc_buffer(ch)) {
 541                         /*
 542                          * Remove our header. It gets added
 543                          * again on retransmit.
 544                          */
 545                         atomic_dec(&skb->users);
 546                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 547                         ctcm_clear_busy(ch->netdev);
 548                         return -ENOMEM;
 549                 }
 550
 551                 skb_reset_tail_pointer(ch->trans_skb);
 552                 ch->trans_skb->len = 0;
 553                 ch->ccw[1].count = skb->len;
 554                 skb_copy_from_linear_data(skb,
 555                                 skb_put(ch->trans_skb, skb->len), skb->len);
 556                 atomic_dec(&skb->users);
 557                 dev_kfree_skb_irq(skb);
 558                 ccw_idx = 0;
 559         } else {
 560                 skb_queue_tail(&ch->io_queue, skb);
 561                 ccw_idx = 3;
 562         }
 563         if (do_debug_ccw)
 564                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 565                                         sizeof(struct ccw1) * 3);
 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 = jiffies;
 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         netif_trans_update(dev);
 646         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 647
 648         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 649
 650         return;
 651
 652 nomem:
 653         grp->in_sweep = 0;
 654         ctcm_clear_busy(dev);
 655         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 656
 657         return;
 658 }
 659
 660 /*
 661  * MPC mode version of transmit_skb
 662  */
 663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 664 {
 665         struct pdu *p_header;
 666         struct net_device *dev = ch->netdev;
 667         struct ctcm_priv *priv = dev->ml_priv;
 668         struct mpc_group *grp = priv->mpcg;
 669         struct th_header *header;
 670         struct sk_buff *nskb;
 671         int rc = 0;
 672         int ccw_idx;
 673         unsigned long hi;
 674         unsigned long saveflags = 0;    /* avoids compiler warning */
 675
 676         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 677                         __func__, dev->name, smp_processor_id(), ch,
 678                                         ch->id, fsm_getstate_str(ch->fsm));
 679
 680         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 681                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 682                 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 = jiffies;
 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 /* first merge version - leaving both functions separated */
 871 static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 872 {
 873         struct ctcm_priv *priv = dev->ml_priv;
 874
 875         if (skb == NULL) {
 876                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 877                                 "%s(%s): NULL sk_buff passed",
 878                                         CTCM_FUNTAIL, dev->name);
 879                 priv->stats.tx_dropped++;
 880                 return NETDEV_TX_OK;
 881         }
 882         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 883                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 884                         "%s(%s): Got sk_buff with head room < %ld bytes",
 885                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 886                 dev_kfree_skb(skb);
 887                 priv->stats.tx_dropped++;
 888                 return NETDEV_TX_OK;
 889         }
 890
 891         /*
 892          * If channels are not running, try to restart them
 893          * and throw away packet.
 894          */
 895         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 896                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 897                 dev_kfree_skb(skb);
 898                 priv->stats.tx_dropped++;
 899                 priv->stats.tx_errors++;
 900                 priv->stats.tx_carrier_errors++;
 901                 return NETDEV_TX_OK;
 902         }
 903
 904         if (ctcm_test_and_set_busy(dev))
 905                 return NETDEV_TX_BUSY;
 906
 907         netif_trans_update(dev);
 908         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 909                 return NETDEV_TX_BUSY;
 910         return NETDEV_TX_OK;
 911 }
 912
 913 /* unmerged MPC variant of ctcm_tx */
 914 static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 915 {
 916         int len = 0;
 917         struct ctcm_priv *priv = dev->ml_priv;
 918         struct mpc_group *grp  = priv->mpcg;
 919         struct sk_buff *newskb = NULL;
 920
 921         /*
 922          * Some sanity checks ...
 923          */
 924         if (skb == NULL) {
 925                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 926                         "%s(%s): NULL sk_buff passed",
 927                                         CTCM_FUNTAIL, dev->name);
 928                 priv->stats.tx_dropped++;
 929                                         goto done;
 930         }
 931         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 932                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 933                         "%s(%s): Got sk_buff with head room < %ld bytes",
 934                         CTCM_FUNTAIL, dev->name,
 935                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 936
 937                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 938
 939                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 940                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 941
 942                 if (!newskb) {
 943                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 944                                 "%s: %s: __dev_alloc_skb failed",
 945                                                 __func__, dev->name);
 946
 947                         dev_kfree_skb_any(skb);
 948                         priv->stats.tx_dropped++;
 949                         priv->stats.tx_errors++;
 950                         priv->stats.tx_carrier_errors++;
 951                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 952                                         goto done;
 953                 }
 954                 newskb->protocol = skb->protocol;
 955                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 956                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 957                 dev_kfree_skb_any(skb);
 958                 skb = newskb;
 959         }
 960
 961         /*
 962          * If channels are not running,
 963          * notify anybody about a link failure and throw
 964          * away packet.
 965          */
 966         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 967            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 968                 dev_kfree_skb_any(skb);
 969                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 970                         "%s(%s): inactive MPCGROUP - dropped",
 971                                         CTCM_FUNTAIL, dev->name);
 972                 priv->stats.tx_dropped++;
 973                 priv->stats.tx_errors++;
 974                 priv->stats.tx_carrier_errors++;
 975                                         goto done;
 976         }
 977
 978         if (ctcm_test_and_set_busy(dev)) {
 979                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 980                         "%s(%s): device busy - dropped",
 981                                         CTCM_FUNTAIL, dev->name);
 982                 dev_kfree_skb_any(skb);
 983                 priv->stats.tx_dropped++;
 984                 priv->stats.tx_errors++;
 985                 priv->stats.tx_carrier_errors++;
 986                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 987                                         goto done;
 988         }
 989
 990         netif_trans_update(dev);
 991         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
 992                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 993                         "%s(%s): device error - dropped",
 994                                         CTCM_FUNTAIL, dev->name);
 995                 dev_kfree_skb_any(skb);
 996                 priv->stats.tx_dropped++;
 997                 priv->stats.tx_errors++;
 998                 priv->stats.tx_carrier_errors++;
 999                 ctcm_clear_busy(dev);
1000                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1001                                         goto done;
1002         }
1003         ctcm_clear_busy(dev);
1004 done:
1005         if (do_debug)
1006                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1007
1008         return NETDEV_TX_OK;    /* handle freeing of skb here */
1009 }
1010
1011
1012 /**
1013  * Sets MTU of an interface.
1014  *
1015  *  dev         Pointer to interface struct.
1016  *  new_mtu     The new MTU to use for this interface.
1017  *
1018  * returns 0 on success, -EINVAL if MTU is out of valid range.
1019  *         (valid range is 576 .. 65527). If VM is on the
1020  *         remote side, maximum MTU is 32760, however this is
1021  *         not checked here.
1022  */
1023 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1024 {
1025         struct ctcm_priv *priv;
1026         int max_bufsize;
1027
1028         if (new_mtu < 576 || new_mtu > 65527)
1029                 return -EINVAL;
1030
1031         priv = dev->ml_priv;
1032         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1033
1034         if (IS_MPC(priv)) {
1035                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1036                         return -EINVAL;
1037                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1038         } else {
1039                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1040                         return -EINVAL;
1041                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1042         }
1043         dev->mtu = new_mtu;
1044         return 0;
1045 }
1046
1047 /**
1048  * Returns interface statistics of a device.
1049  *
1050  *  dev         Pointer to interface struct.
1051  *
1052  * returns Pointer to stats struct of this interface.
1053  */
1054 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1055 {
1056         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1057 }
1058
1059 static void ctcm_free_netdevice(struct net_device *dev)
1060 {
1061         struct ctcm_priv *priv;
1062         struct mpc_group *grp;
1063
1064         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1065                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1066         priv = dev->ml_priv;
1067         if (priv) {
1068                 grp = priv->mpcg;
1069                 if (grp) {
1070                         if (grp->fsm)
1071                                 kfree_fsm(grp->fsm);
1072                         if (grp->xid_skb)
1073                                 dev_kfree_skb(grp->xid_skb);
1074                         if (grp->rcvd_xid_skb)
1075                                 dev_kfree_skb(grp->rcvd_xid_skb);
1076                         tasklet_kill(&grp->mpc_tasklet2);
1077                         kfree(grp);
1078                         priv->mpcg = NULL;
1079                 }
1080                 if (priv->fsm) {
1081                         kfree_fsm(priv->fsm);
1082                         priv->fsm = NULL;
1083                 }
1084                 kfree(priv->xid);
1085                 priv->xid = NULL;
1086         /*
1087          * Note: kfree(priv); is done in "opposite" function of
1088          * allocator function probe_device which is remove_device.
1089          */
1090         }
1091 #ifdef MODULE
1092         free_netdev(dev);
1093 #endif
1094 }
1095
1096 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1097
1098 static const struct net_device_ops ctcm_netdev_ops = {
1099         .ndo_open               = ctcm_open,
1100         .ndo_stop               = ctcm_close,
1101         .ndo_get_stats          = ctcm_stats,
1102         .ndo_change_mtu         = ctcm_change_mtu,
1103         .ndo_start_xmit         = ctcm_tx,
1104 };
1105
1106 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1107         .ndo_open               = ctcm_open,
1108         .ndo_stop               = ctcm_close,
1109         .ndo_get_stats          = ctcm_stats,
1110         .ndo_change_mtu         = ctcm_change_mtu,
1111         .ndo_start_xmit         = ctcmpc_tx,
1112 };
1113
1114 void static ctcm_dev_setup(struct net_device *dev)
1115 {
1116         dev->type = ARPHRD_SLIP;
1117         dev->tx_queue_len = 100;
1118         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1119 }
1120
1121 /*
1122  * Initialize everything of the net device except the name and the
1123  * channel structs.
1124  */
1125 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1126 {
1127         struct net_device *dev;
1128         struct mpc_group *grp;
1129         if (!priv)
1130                 return NULL;
1131
1132         if (IS_MPC(priv))
1133                 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1134                                    ctcm_dev_setup);
1135         else
1136                 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1137                                    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                 free_netdev(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                         free_netdev(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[CTCM_READ]->cdev == cdev)
1226                 ch = priv->channel[CTCM_READ];
1227         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1228                 ch = priv->channel[CTCM_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 static const struct device_type ctcm_devtype = {
1293         .name = "ctcm",
1294         .groups = ctcm_attr_groups,
1295 };
1296
1297 /**
1298  * Add ctcm specific attributes.
1299  * Add ctcm private data.
1300  *
1301  *  cgdev       pointer to ccwgroup_device just added
1302  *
1303  * returns 0 on success, !0 on failure.
1304  */
1305 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1306 {
1307         struct ctcm_priv *priv;
1308
1309         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1310                         "%s %p",
1311                         __func__, cgdev);
1312
1313         if (!get_device(&cgdev->dev))
1314                 return -ENODEV;
1315
1316         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1317         if (!priv) {
1318                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1319                         "%s: memory allocation failure",
1320                         CTCM_FUNTAIL);
1321                 put_device(&cgdev->dev);
1322                 return -ENOMEM;
1323         }
1324         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1325         cgdev->cdev[0]->handler = ctcm_irq_handler;
1326         cgdev->cdev[1]->handler = ctcm_irq_handler;
1327         dev_set_drvdata(&cgdev->dev, priv);
1328         cgdev->dev.type = &ctcm_devtype;
1329
1330         return 0;
1331 }
1332
1333 /**
1334  * Add a new channel to the list of channels.
1335  * Keeps the channel list sorted.
1336  *
1337  *  cdev        The ccw_device to be added.
1338  *  type        The type class of the new channel.
1339  *  priv        Points to the private data of the ccwgroup_device.
1340  *
1341  * returns 0 on success, !0 on error.
1342  */
1343 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1344                                 struct ctcm_priv *priv)
1345 {
1346         struct channel **c = &channels;
1347         struct channel *ch;
1348         int ccw_num;
1349         int rc = 0;
1350
1351         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1352                 "%s(%s), type %d, proto %d",
1353                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1354
1355         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1356         if (ch == NULL)
1357                 return -ENOMEM;
1358
1359         ch->protocol = priv->protocol;
1360         if (IS_MPC(priv)) {
1361                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1362                 if (ch->discontact_th == NULL)
1363                                         goto nomem_return;
1364
1365                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1366                 tasklet_init(&ch->ch_disc_tasklet,
1367                         mpc_action_send_discontact, (unsigned long)ch);
1368
1369                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1370                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1371                 ccw_num = 17;
1372         } else
1373                 ccw_num = 8;
1374
1375         ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1376         if (ch->ccw == NULL)
1377                                         goto nomem_return;
1378
1379         ch->cdev = cdev;
1380         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1381         ch->type = type;
1382
1383         /**
1384          * "static" ccws are used in the following way:
1385          *
1386          * ccw[0..2] (Channel program for generic I/O):
1387          *           0: prepare
1388          *           1: read or write (depending on direction) with fixed
1389          *              buffer (idal allocated once when buffer is allocated)
1390          *           2: nop
1391          * ccw[3..5] (Channel program for direct write of packets)
1392          *           3: prepare
1393          *           4: write (idal allocated on every write).
1394          *           5: nop
1395          * ccw[6..7] (Channel program for initial channel setup):
1396          *           6: set extended mode
1397          *           7: nop
1398          *
1399          * ch->ccw[0..5] are initialized in ch_action_start because
1400          * the channel's direction is yet unknown here.
1401          *
1402          * ccws used for xid2 negotiations
1403          *  ch-ccw[8-14] need to be used for the XID exchange either
1404          *    X side XID2 Processing
1405          *       8:  write control
1406          *       9:  write th
1407          *           10: write XID
1408          *           11: read th from secondary
1409          *           12: read XID   from secondary
1410          *           13: read 4 byte ID
1411          *           14: nop
1412          *    Y side XID Processing
1413          *           8:  sense
1414          *       9:  read th
1415          *           10: read XID
1416          *           11: write th
1417          *           12: write XID
1418          *           13: write 4 byte ID
1419          *           14: nop
1420          *
1421          *  ccws used for double noop due to VM timing issues
1422          *  which result in unrecoverable Busy on channel
1423          *       15: nop
1424          *       16: nop
1425          */
1426         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1427         ch->ccw[6].flags        = CCW_FLAG_SLI;
1428
1429         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1430         ch->ccw[7].flags        = CCW_FLAG_SLI;
1431
1432         if (IS_MPC(priv)) {
1433                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1434                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1435                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1436                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1437
1438                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1439                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1440
1441                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1442                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1443                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1444                                 mpc_ch_fsm_len, GFP_KERNEL);
1445         } else {
1446                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1447                                 ctc_ch_event_names, CTC_NR_STATES,
1448                                 CTC_NR_EVENTS, ch_fsm,
1449                                 ch_fsm_len, GFP_KERNEL);
1450         }
1451         if (ch->fsm == NULL)
1452                                 goto nomem_return;
1453
1454         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1455
1456         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1457         if (ch->irb == NULL)
1458                                 goto nomem_return;
1459
1460         while (*c && ctcm_less_than((*c)->id, ch->id))
1461                 c = &(*c)->next;
1462
1463         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1464                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1465                                 "%s (%s) already in list, using old entry",
1466                                 __func__, (*c)->id);
1467
1468                                 goto free_return;
1469         }
1470
1471         spin_lock_init(&ch->collect_lock);
1472
1473         fsm_settimer(ch->fsm, &ch->timer);
1474         skb_queue_head_init(&ch->io_queue);
1475         skb_queue_head_init(&ch->collect_queue);
1476
1477         if (IS_MPC(priv)) {
1478                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1479                 skb_queue_head_init(&ch->sweep_queue);
1480         }
1481         ch->next = *c;
1482         *c = ch;
1483         return 0;
1484
1485 nomem_return:
1486         rc = -ENOMEM;
1487
1488 free_return:    /* note that all channel pointers are 0 or valid */
1489         kfree(ch->ccw);
1490         kfree(ch->discontact_th);
1491         kfree_fsm(ch->fsm);
1492         kfree(ch->irb);
1493         kfree(ch);
1494         return rc;
1495 }
1496
1497 /*
1498  * Return type of a detected device.
1499  */
1500 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1501 {
1502         enum ctcm_channel_types type;
1503         type = (enum ctcm_channel_types)id->driver_info;
1504
1505         if (type == ctcm_channel_type_ficon)
1506                 type = ctcm_channel_type_escon;
1507
1508         return type;
1509 }
1510
1511 /**
1512  *
1513  * Setup an interface.
1514  *
1515  *  cgdev       Device to be setup.
1516  *
1517  * returns 0 on success, !0 on failure.
1518  */
1519 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1520 {
1521         char read_id[CTCM_ID_SIZE];
1522         char write_id[CTCM_ID_SIZE];
1523         int direction;
1524         enum ctcm_channel_types type;
1525         struct ctcm_priv *priv;
1526         struct net_device *dev;
1527         struct ccw_device *cdev0;
1528         struct ccw_device *cdev1;
1529         struct channel *readc;
1530         struct channel *writec;
1531         int ret;
1532         int result;
1533
1534         priv = dev_get_drvdata(&cgdev->dev);
1535         if (!priv) {
1536                 result = -ENODEV;
1537                 goto out_err_result;
1538         }
1539
1540         cdev0 = cgdev->cdev[0];
1541         cdev1 = cgdev->cdev[1];
1542
1543         type = get_channel_type(&cdev0->id);
1544
1545         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1546         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1547
1548         ret = add_channel(cdev0, type, priv);
1549         if (ret) {
1550                 result = ret;
1551                 goto out_err_result;
1552         }
1553         ret = add_channel(cdev1, type, priv);
1554         if (ret) {
1555                 result = ret;
1556                 goto out_remove_channel1;
1557         }
1558
1559         ret = ccw_device_set_online(cdev0);
1560         if (ret != 0) {
1561                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1562                         "%s(%s) set_online rc=%d",
1563                                 CTCM_FUNTAIL, read_id, ret);
1564                 result = -EIO;
1565                 goto out_remove_channel2;
1566         }
1567
1568         ret = ccw_device_set_online(cdev1);
1569         if (ret != 0) {
1570                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1571                         "%s(%s) set_online rc=%d",
1572                                 CTCM_FUNTAIL, write_id, ret);
1573
1574                 result = -EIO;
1575                 goto out_ccw1;
1576         }
1577
1578         dev = ctcm_init_netdevice(priv);
1579         if (dev == NULL) {
1580                 result = -ENODEV;
1581                 goto out_ccw2;
1582         }
1583
1584         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1585                 priv->channel[direction] =
1586                         channel_get(type, direction == CTCM_READ ?
1587                                 read_id : write_id, direction);
1588                 if (priv->channel[direction] == NULL) {
1589                         if (direction == CTCM_WRITE)
1590                                 channel_free(priv->channel[CTCM_READ]);
1591                         result = -ENODEV;
1592                         goto out_dev;
1593                 }
1594                 priv->channel[direction]->netdev = dev;
1595                 priv->channel[direction]->protocol = priv->protocol;
1596                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1597         }
1598         /* sysfs magic */
1599         SET_NETDEV_DEV(dev, &cgdev->dev);
1600
1601         if (register_netdev(dev)) {
1602                 result = -ENODEV;
1603                 goto out_dev;
1604         }
1605
1606         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1607
1608         dev_info(&dev->dev,
1609                 "setup OK : r/w = %s/%s, protocol : %d\n",
1610                         priv->channel[CTCM_READ]->id,
1611                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1612
1613         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1614                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1615                         priv->channel[CTCM_READ]->id,
1616                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1617
1618         return 0;
1619 out_dev:
1620         ctcm_free_netdevice(dev);
1621 out_ccw2:
1622         ccw_device_set_offline(cgdev->cdev[1]);
1623 out_ccw1:
1624         ccw_device_set_offline(cgdev->cdev[0]);
1625 out_remove_channel2:
1626         readc = channel_get(type, read_id, CTCM_READ);
1627         channel_remove(readc);
1628 out_remove_channel1:
1629         writec = channel_get(type, write_id, CTCM_WRITE);
1630         channel_remove(writec);
1631 out_err_result:
1632         return result;
1633 }
1634
1635 /**
1636  * Shutdown an interface.
1637  *
1638  *  cgdev       Device to be shut down.
1639  *
1640  * returns 0 on success, !0 on failure.
1641  */
1642 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1643 {
1644         struct ctcm_priv *priv;
1645         struct net_device *dev;
1646
1647         priv = dev_get_drvdata(&cgdev->dev);
1648         if (!priv)
1649                 return -ENODEV;
1650
1651         if (priv->channel[CTCM_READ]) {
1652                 dev = priv->channel[CTCM_READ]->netdev;
1653                 CTCM_DBF_DEV(SETUP, dev, "");
1654                 /* Close the device */
1655                 ctcm_close(dev);
1656                 dev->flags &= ~IFF_RUNNING;
1657                 channel_free(priv->channel[CTCM_READ]);
1658         } else
1659                 dev = NULL;
1660
1661         if (priv->channel[CTCM_WRITE])
1662                 channel_free(priv->channel[CTCM_WRITE]);
1663
1664         if (dev) {
1665                 unregister_netdev(dev);
1666                 ctcm_free_netdevice(dev);
1667         }
1668
1669         if (priv->fsm)
1670                 kfree_fsm(priv->fsm);
1671
1672         ccw_device_set_offline(cgdev->cdev[1]);
1673         ccw_device_set_offline(cgdev->cdev[0]);
1674         channel_remove(priv->channel[CTCM_READ]);
1675         channel_remove(priv->channel[CTCM_WRITE]);
1676         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1677
1678         return 0;
1679
1680 }
1681
1682
1683 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1684 {
1685         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1686
1687         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1688                         "removing device %p, proto : %d",
1689                         cgdev, priv->protocol);
1690
1691         if (cgdev->state == CCWGROUP_ONLINE)
1692                 ctcm_shutdown_device(cgdev);
1693         dev_set_drvdata(&cgdev->dev, NULL);
1694         kfree(priv);
1695         put_device(&cgdev->dev);
1696 }
1697
1698 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1699 {
1700         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1701
1702         if (gdev->state == CCWGROUP_OFFLINE)
1703                 return 0;
1704         netif_device_detach(priv->channel[CTCM_READ]->netdev);
1705         ctcm_close(priv->channel[CTCM_READ]->netdev);
1706         if (!wait_event_timeout(priv->fsm->wait_q,
1707             fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1708                 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1709                 return -EBUSY;
1710         }
1711         ccw_device_set_offline(gdev->cdev[1]);
1712         ccw_device_set_offline(gdev->cdev[0]);
1713         return 0;
1714 }
1715
1716 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1717 {
1718         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1719         int rc;
1720
1721         if (gdev->state == CCWGROUP_OFFLINE)
1722                 return 0;
1723         rc = ccw_device_set_online(gdev->cdev[1]);
1724         if (rc)
1725                 goto err_out;
1726         rc = ccw_device_set_online(gdev->cdev[0]);
1727         if (rc)
1728                 goto err_out;
1729         ctcm_open(priv->channel[CTCM_READ]->netdev);
1730 err_out:
1731         netif_device_attach(priv->channel[CTCM_READ]->netdev);
1732         return rc;
1733 }
1734
1735 static struct ccw_device_id ctcm_ids[] = {
1736         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1737         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1738         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1739         {},
1740 };
1741 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1742
1743 static struct ccw_driver ctcm_ccw_driver = {
1744         .driver = {
1745                 .owner  = THIS_MODULE,
1746                 .name   = "ctcm",
1747         },
1748         .ids    = ctcm_ids,
1749         .probe  = ccwgroup_probe_ccwdev,
1750         .remove = ccwgroup_remove_ccwdev,
1751         .int_class = IRQIO_CTC,
1752 };
1753
1754 static struct ccwgroup_driver ctcm_group_driver = {
1755         .driver = {
1756                 .owner  = THIS_MODULE,
1757                 .name   = CTC_DRIVER_NAME,
1758         },
1759         .setup       = ctcm_probe_device,
1760         .remove      = ctcm_remove_device,
1761         .set_online  = ctcm_new_device,
1762         .set_offline = ctcm_shutdown_device,
1763         .freeze      = ctcm_pm_suspend,
1764         .thaw        = ctcm_pm_resume,
1765         .restore     = ctcm_pm_resume,
1766 };
1767
1768 static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1769                                        const char *buf, size_t count)
1770 {
1771         int err;
1772
1773         err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1774         return err ? err : count;
1775 }
1776 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1777
1778 static struct attribute *ctcm_drv_attrs[] = {
1779         &driver_attr_group.attr,
1780         NULL,
1781 };
1782 static struct attribute_group ctcm_drv_attr_group = {
1783         .attrs = ctcm_drv_attrs,
1784 };
1785 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1786         &ctcm_drv_attr_group,
1787         NULL,
1788 };
1789
1790 /*
1791  * Module related routines
1792  */
1793
1794 /*
1795  * Prepare to be unloaded. Free IRQ's and release all resources.
1796  * This is called just before this module is unloaded. It is
1797  * not called, if the usage count is !0, so we don't need to check
1798  * for that.
1799  */
1800 static void __exit ctcm_exit(void)
1801 {
1802         ccwgroup_driver_unregister(&ctcm_group_driver);
1803         ccw_driver_unregister(&ctcm_ccw_driver);
1804         root_device_unregister(ctcm_root_dev);
1805         ctcm_unregister_dbf_views();
1806         pr_info("CTCM driver unloaded\n");
1807 }
1808
1809 /*
1810  * Print Banner.
1811  */
1812 static void print_banner(void)
1813 {
1814         pr_info("CTCM driver initialized\n");
1815 }
1816
1817 /**
1818  * Initialize module.
1819  * This is called just after the module is loaded.
1820  *
1821  * returns 0 on success, !0 on error.
1822  */
1823 static int __init ctcm_init(void)
1824 {
1825         int ret;
1826
1827         channels = NULL;
1828
1829         ret = ctcm_register_dbf_views();
1830         if (ret)
1831                 goto out_err;
1832         ctcm_root_dev = root_device_register("ctcm");
1833         ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1834         if (ret)
1835                 goto register_err;
1836         ret = ccw_driver_register(&ctcm_ccw_driver);
1837         if (ret)
1838                 goto ccw_err;
1839         ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1840         ret = ccwgroup_driver_register(&ctcm_group_driver);
1841         if (ret)
1842                 goto ccwgroup_err;
1843         print_banner();
1844         return 0;
1845
1846 ccwgroup_err:
1847         ccw_driver_unregister(&ctcm_ccw_driver);
1848 ccw_err:
1849         root_device_unregister(ctcm_root_dev);
1850 register_err:
1851         ctcm_unregister_dbf_views();
1852 out_err:
1853         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1854                 __func__, ret);
1855         return ret;
1856 }
1857
1858 module_init(ctcm_init);
1859 module_exit(ctcm_exit);
1860
1861 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1862 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1863 MODULE_LICENSE("GPL");
1864