drivers/s390/net/ctcm_main.c

   1 /*
   2  * drivers/s390/net/ctcm_main.c
   3  *
   4  * Copyright IBM Corp. 2001, 2009
   5  * Author(s):
   6  *      Original CTC driver(s):
   7  *              Fritz Elfert (felfert@millenux.com)
   8  *              Dieter Wellerdiek (wel@de.ibm.com)
   9  *              Martin Schwidefsky (schwidefsky@de.ibm.com)
  10  *              Denis Joseph Barrow (barrow_dj@yahoo.com)
  11  *              Jochen Roehrig (roehrig@de.ibm.com)
  12  *              Cornelia Huck <cornelia.huck@de.ibm.com>
  13  *      MPC additions:
  14  *              Belinda Thompson (belindat@us.ibm.com)
  15  *              Andy Richter (richtera@us.ibm.com)
  16  *      Revived by:
  17  *              Peter Tiedemann (ptiedem@de.ibm.com)
  18  */
  19
  20 #undef DEBUG
  21 #undef DEBUGDATA
  22 #undef DEBUGCCW
  23
  24 #define KMSG_COMPONENT "ctcm"
  25 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  26
  27 #include <linux/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 "ctcm_fsms.h"
  55 #include "ctcm_main.h"
  56
  57 /* Some common global variables */
  58
  59 /**
  60  * The root device for ctcm group devices
  61  */
  62 static struct device *ctcm_root_dev;
  63
  64 /*
  65  * Linked list of all detected channels.
  66  */
  67 struct channel *channels;
  68
  69 /**
  70  * Unpack a just received skb and hand it over to
  71  * upper layers.
  72  *
  73  *  ch          The channel where this skb has been received.
  74  *  pskb        The received skb.
  75  */
  76 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  77 {
  78         struct net_device *dev = ch->netdev;
  79         struct ctcm_priv *priv = dev->ml_priv;
  80         __u16 len = *((__u16 *) pskb->data);
  81
  82         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  83         skb_pull(pskb, 2);
  84         pskb->dev = dev;
  85         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  86         while (len > 0) {
  87                 struct sk_buff *skb;
  88                 int skblen;
  89                 struct ll_header *header = (struct ll_header *)pskb->data;
  90
  91                 skb_pull(pskb, LL_HEADER_LENGTH);
  92                 if ((ch->protocol == CTCM_PROTO_S390) &&
  93                     (header->type != ETH_P_IP)) {
  94                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  95                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  96                                 /*
  97                                  * Check packet type only if we stick strictly
  98                                  * to S/390's protocol of OS390. This only
  99                                  * supports IP. Otherwise allow any packet
 100                                  * type.
 101                                  */
 102                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 103                                         "%s(%s): Illegal packet type 0x%04x"
 104                                         " - dropping",
 105                                         CTCM_FUNTAIL, dev->name, header->type);
 106                         }
 107                         priv->stats.rx_dropped++;
 108                         priv->stats.rx_frame_errors++;
 109                         return;
 110                 }
 111                 pskb->protocol = ntohs(header->type);
 112                 if ((header->length <= LL_HEADER_LENGTH) ||
 113                     (len <= LL_HEADER_LENGTH)) {
 114                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 115                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 116                                         "%s(%s): Illegal packet size %d(%d,%d)"
 117                                         "- dropping",
 118                                         CTCM_FUNTAIL, dev->name,
 119                                         header->length, dev->mtu, len);
 120                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 121                         }
 122
 123                         priv->stats.rx_dropped++;
 124                         priv->stats.rx_length_errors++;
 125                         return;
 126                 }
 127                 header->length -= LL_HEADER_LENGTH;
 128                 len -= LL_HEADER_LENGTH;
 129                 if ((header->length > skb_tailroom(pskb)) ||
 130                         (header->length > len)) {
 131                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 132                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 133                                         "%s(%s): Packet size %d (overrun)"
 134                                         " - dropping", CTCM_FUNTAIL,
 135                                                 dev->name, header->length);
 136                                 ch->logflags |= LOG_FLAG_OVERRUN;
 137                         }
 138
 139                         priv->stats.rx_dropped++;
 140                         priv->stats.rx_length_errors++;
 141                         return;
 142                 }
 143                 skb_put(pskb, header->length);
 144                 skb_reset_mac_header(pskb);
 145                 len -= header->length;
 146                 skb = dev_alloc_skb(pskb->len);
 147                 if (!skb) {
 148                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 149                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 150                                         "%s(%s): MEMORY allocation error",
 151                                                 CTCM_FUNTAIL, dev->name);
 152                                 ch->logflags |= LOG_FLAG_NOMEM;
 153                         }
 154                         priv->stats.rx_dropped++;
 155                         return;
 156                 }
 157                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 158                                           pskb->len);
 159                 skb_reset_mac_header(skb);
 160                 skb->dev = pskb->dev;
 161                 skb->protocol = pskb->protocol;
 162                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 163                 skblen = skb->len;
 164                 /*
 165                  * reset logflags
 166                  */
 167                 ch->logflags = 0;
 168                 priv->stats.rx_packets++;
 169                 priv->stats.rx_bytes += skblen;
 170                 netif_rx_ni(skb);
 171                 if (len > 0) {
 172                         skb_pull(pskb, header->length);
 173                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 174                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 175                                         "Overrun in ctcm_unpack_skb");
 176                                 ch->logflags |= LOG_FLAG_OVERRUN;
 177                                 return;
 178                         }
 179                         skb_put(pskb, LL_HEADER_LENGTH);
 180                 }
 181         }
 182 }
 183
 184 /**
 185  * Release a specific channel in the channel list.
 186  *
 187  *  ch          Pointer to channel struct to be released.
 188  */
 189 static void channel_free(struct channel *ch)
 190 {
 191         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 192         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 193         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 194 }
 195
 196 /**
 197  * Remove a specific channel in the channel list.
 198  *
 199  *  ch          Pointer to channel struct to be released.
 200  */
 201 static void channel_remove(struct channel *ch)
 202 {
 203         struct channel **c = &channels;
 204         char chid[CTCM_ID_SIZE+1];
 205         int ok = 0;
 206
 207         if (ch == NULL)
 208                 return;
 209         else
 210                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 211
 212         channel_free(ch);
 213         while (*c) {
 214                 if (*c == ch) {
 215                         *c = ch->next;
 216                         fsm_deltimer(&ch->timer);
 217                         if (IS_MPC(ch))
 218                                 fsm_deltimer(&ch->sweep_timer);
 219
 220                         kfree_fsm(ch->fsm);
 221                         clear_normalized_cda(&ch->ccw[4]);
 222                         if (ch->trans_skb != NULL) {
 223                                 clear_normalized_cda(&ch->ccw[1]);
 224                                 dev_kfree_skb_any(ch->trans_skb);
 225                         }
 226                         if (IS_MPC(ch)) {
 227                                 tasklet_kill(&ch->ch_tasklet);
 228                                 tasklet_kill(&ch->ch_disc_tasklet);
 229                                 kfree(ch->discontact_th);
 230                         }
 231                         kfree(ch->ccw);
 232                         kfree(ch->irb);
 233                         kfree(ch);
 234                         ok = 1;
 235                         break;
 236                 }
 237                 c = &((*c)->next);
 238         }
 239
 240         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 241                         chid, ok ? "OK" : "failed");
 242 }
 243
 244 /**
 245  * Get a specific channel from the channel list.
 246  *
 247  *  type        Type of channel we are interested in.
 248  *  id          Id of channel we are interested in.
 249  *  direction   Direction we want to use this channel for.
 250  *
 251  * returns Pointer to a channel or NULL if no matching channel available.
 252  */
 253 static struct channel *channel_get(enum ctcm_channel_types type,
 254                                         char *id, int direction)
 255 {
 256         struct channel *ch = channels;
 257
 258         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 259                 ch = ch->next;
 260         if (!ch) {
 261                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 262                                 "%s(%d, %s, %d) not found in channel list\n",
 263                                 CTCM_FUNTAIL, type, id, direction);
 264         } else {
 265                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 266                         ch = NULL;
 267                 else {
 268                         ch->flags |= CHANNEL_FLAGS_INUSE;
 269                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 270                         ch->flags |= (direction == WRITE)
 271                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 272                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 273                 }
 274         }
 275         return ch;
 276 }
 277
 278 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 279 {
 280         if (!IS_ERR(irb))
 281                 return 0;
 282
 283         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 284                         "irb error %ld on device %s\n",
 285                                 PTR_ERR(irb), dev_name(&cdev->dev));
 286
 287         switch (PTR_ERR(irb)) {
 288         case -EIO:
 289                 dev_err(&cdev->dev,
 290                         "An I/O-error occurred on the CTCM device\n");
 291                 break;
 292         case -ETIMEDOUT:
 293                 dev_err(&cdev->dev,
 294                         "An adapter hardware operation timed out\n");
 295                 break;
 296         default:
 297                 dev_err(&cdev->dev,
 298                         "An error occurred on the adapter hardware\n");
 299         }
 300         return PTR_ERR(irb);
 301 }
 302
 303
 304 /**
 305  * Check sense of a unit check.
 306  *
 307  *  ch          The channel, the sense code belongs to.
 308  *  sense       The sense code to inspect.
 309  */
 310 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
 311 {
 312         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 313                         "%s(%s): %02x",
 314                                 CTCM_FUNTAIL, ch->id, sense);
 315
 316         if (sense & SNS0_INTERVENTION_REQ) {
 317                 if (sense & 0x01) {
 318                         if (ch->sense_rc != 0x01) {
 319                                 pr_notice(
 320                                         "%s: The communication peer has "
 321                                         "disconnected\n", ch->id);
 322                                 ch->sense_rc = 0x01;
 323                         }
 324                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 325                 } else {
 326                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 327                                 pr_notice(
 328                                         "%s: The remote operating system is "
 329                                         "not available\n", ch->id);
 330                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 331                         }
 332                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 333                 }
 334         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 335                 if (sense & SNS0_BUS_OUT_CHECK) {
 336                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 337                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 338                                         "%s(%s): remote HW error %02x",
 339                                                 CTCM_FUNTAIL, ch->id, sense);
 340                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 341                         }
 342                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 343                 } else {
 344                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 345                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 346                                         "%s(%s): remote read parity error %02x",
 347                                                 CTCM_FUNTAIL, ch->id, sense);
 348                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 349                         }
 350                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 351                 }
 352         } else if (sense & SNS0_BUS_OUT_CHECK) {
 353                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 354                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 355                                 "%s(%s): BUS OUT error %02x",
 356                                         CTCM_FUNTAIL, ch->id, sense);
 357                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 358                 }
 359                 if (sense & 0x04)       /* data-streaming timeout */
 360                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 361                 else                    /* Data-transfer parity error */
 362                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 363         } else if (sense & SNS0_CMD_REJECT) {
 364                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 365                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 366                                 "%s(%s): Command rejected",
 367                                                 CTCM_FUNTAIL, ch->id);
 368                         ch->sense_rc = SNS0_CMD_REJECT;
 369                 }
 370         } else if (sense == 0) {
 371                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 372                         "%s(%s): Unit check ZERO",
 373                                         CTCM_FUNTAIL, ch->id);
 374                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 375         } else {
 376                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 377                         "%s(%s): Unit check code %02x unknown",
 378                                         CTCM_FUNTAIL, ch->id, sense);
 379                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 380         }
 381 }
 382
 383 int ctcm_ch_alloc_buffer(struct channel *ch)
 384 {
 385         clear_normalized_cda(&ch->ccw[1]);
 386         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 387         if (ch->trans_skb == NULL) {
 388                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 389                         "%s(%s): %s trans_skb allocation error",
 390                         CTCM_FUNTAIL, ch->id,
 391                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
 392                 return -ENOMEM;
 393         }
 394
 395         ch->ccw[1].count = ch->max_bufsize;
 396         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 397                 dev_kfree_skb(ch->trans_skb);
 398                 ch->trans_skb = NULL;
 399                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 400                         "%s(%s): %s set norm_cda failed",
 401                         CTCM_FUNTAIL, ch->id,
 402                         (CHANNEL_DIRECTION(ch->flags) == READ) ? "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         ch->retry = 0;
 564         fsm_newstate(ch->fsm, CTC_STATE_TX);
 565         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 566         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 567         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 568         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 569                                         (unsigned long)ch, 0xff, 0);
 570         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 571         if (ccw_idx == 3)
 572                 ch->prof.doios_single++;
 573         if (rc != 0) {
 574                 fsm_deltimer(&ch->timer);
 575                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 576                 if (ccw_idx == 3)
 577                         skb_dequeue_tail(&ch->io_queue);
 578                 /*
 579                  * Remove our header. It gets added
 580                  * again on retransmit.
 581                  */
 582                 skb_pull(skb, LL_HEADER_LENGTH + 2);
 583         } else if (ccw_idx == 0) {
 584                 struct net_device *dev = ch->netdev;
 585                 struct ctcm_priv *priv = dev->ml_priv;
 586                 priv->stats.tx_packets++;
 587                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 588         }
 589 done:
 590         ctcm_clear_busy(ch->netdev);
 591         return rc;
 592 }
 593
 594 static void ctcmpc_send_sweep_req(struct channel *rch)
 595 {
 596         struct net_device *dev = rch->netdev;
 597         struct ctcm_priv *priv;
 598         struct mpc_group *grp;
 599         struct th_sweep *header;
 600         struct sk_buff *sweep_skb;
 601         struct channel *ch;
 602         /* int rc = 0; */
 603
 604         priv = dev->ml_priv;
 605         grp = priv->mpcg;
 606         ch = priv->channel[WRITE];
 607
 608         /* sweep processing is not complete until response and request */
 609         /* has completed for all read channels in group                */
 610         if (grp->in_sweep == 0) {
 611                 grp->in_sweep = 1;
 612                 grp->sweep_rsp_pend_num = grp->active_channels[READ];
 613                 grp->sweep_req_pend_num = grp->active_channels[READ];
 614         }
 615
 616         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 617
 618         if (sweep_skb == NULL)  {
 619                 /* rc = -ENOMEM; */
 620                                 goto nomem;
 621         }
 622
 623         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 624
 625         if (!header) {
 626                 dev_kfree_skb_any(sweep_skb);
 627                 /* rc = -ENOMEM; */
 628                                 goto nomem;
 629         }
 630
 631         header->th.th_seg       = 0x00 ;
 632         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 633         header->th.th_blk_flag  = 0x00;
 634         header->th.th_is_xid    = 0x00;
 635         header->th.th_seq_num   = 0x00;
 636         header->sw.th_last_seq  = ch->th_seq_num;
 637
 638         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 639
 640         kfree(header);
 641
 642         dev->trans_start = jiffies;
 643         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 644
 645         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 646
 647         return;
 648
 649 nomem:
 650         grp->in_sweep = 0;
 651         ctcm_clear_busy(dev);
 652         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 653
 654         return;
 655 }
 656
 657 /*
 658  * MPC mode version of transmit_skb
 659  */
 660 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 661 {
 662         struct pdu *p_header;
 663         struct net_device *dev = ch->netdev;
 664         struct ctcm_priv *priv = dev->ml_priv;
 665         struct mpc_group *grp = priv->mpcg;
 666         struct th_header *header;
 667         struct sk_buff *nskb;
 668         int rc = 0;
 669         int ccw_idx;
 670         unsigned long hi;
 671         unsigned long saveflags = 0;    /* avoids compiler warning */
 672         __u16 block_len;
 673
 674         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 675                         __func__, dev->name, smp_processor_id(), ch,
 676                                         ch->id, fsm_getstate_str(ch->fsm));
 677
 678         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 679                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 680                 atomic_inc(&skb->users);
 681                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 682
 683                 if (!p_header) {
 684                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 685                                 goto nomem_exit;
 686                 }
 687
 688                 p_header->pdu_offset = skb->len;
 689                 p_header->pdu_proto = 0x01;
 690                 p_header->pdu_flag = 0x00;
 691                 if (skb->protocol == ntohs(ETH_P_SNAP)) {
 692                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 693                 } else {
 694                         p_header->pdu_flag |= PDU_FIRST;
 695                 }
 696                 p_header->pdu_seq = 0;
 697                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 698                        PDU_HEADER_LENGTH);
 699
 700                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 701                                 "pdu header and data for up to 32 bytes:\n",
 702                                 __func__, dev->name, skb->len);
 703                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 704
 705                 skb_queue_tail(&ch->collect_queue, skb);
 706                 ch->collect_len += skb->len;
 707                 kfree(p_header);
 708
 709                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 710                         goto done;
 711         }
 712
 713         /*
 714          * Protect skb against beeing free'd by upper
 715          * layers.
 716          */
 717         atomic_inc(&skb->users);
 718
 719         block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 720         /*
 721          * IDAL support in CTCM is broken, so we have to
 722          * care about skb's above 2G ourselves.
 723          */
 724         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 725         if (hi) {
 726                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 727                 if (!nskb) {
 728                         goto nomem_exit;
 729                 } else {
 730                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 731                         atomic_inc(&nskb->users);
 732                         atomic_dec(&skb->users);
 733                         dev_kfree_skb_irq(skb);
 734                         skb = nskb;
 735                 }
 736         }
 737
 738         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 739
 740         if (!p_header)
 741                 goto nomem_exit;
 742
 743         p_header->pdu_offset = skb->len;
 744         p_header->pdu_proto = 0x01;
 745         p_header->pdu_flag = 0x00;
 746         p_header->pdu_seq = 0;
 747         if (skb->protocol == ntohs(ETH_P_SNAP)) {
 748                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 749         } else {
 750                 p_header->pdu_flag |= PDU_FIRST;
 751         }
 752         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 753
 754         kfree(p_header);
 755
 756         if (ch->collect_len > 0) {
 757                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 758                 skb_queue_tail(&ch->collect_queue, skb);
 759                 ch->collect_len += skb->len;
 760                 skb = skb_dequeue(&ch->collect_queue);
 761                 ch->collect_len -= skb->len;
 762                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 763         }
 764
 765         p_header = (struct pdu *)skb->data;
 766         p_header->pdu_flag |= PDU_LAST;
 767
 768         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 769
 770         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 771         if (!header)
 772                 goto nomem_exit;
 773
 774         header->th_seg = 0x00;
 775         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 776         header->th_blk_flag = 0x00;
 777         header->th_is_xid = 0x00;          /* Just data here */
 778         ch->th_seq_num++;
 779         header->th_seq_num = ch->th_seq_num;
 780
 781         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 782                        __func__, dev->name, ch->th_seq_num);
 783
 784         /* put the TH on the packet */
 785         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 786
 787         kfree(header);
 788
 789         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 790                         "up to 32 bytes sent to vtam:\n",
 791                                 __func__, dev->name, skb->len);
 792         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 793
 794         ch->ccw[4].count = skb->len;
 795         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 796                 /*
 797                  * idal allocation failed, try via copying to trans_skb.
 798                  * trans_skb usually has a pre-allocated idal.
 799                  */
 800                 if (ctcm_checkalloc_buffer(ch)) {
 801                         /*
 802                          * Remove our header.
 803                          * It gets added again on retransmit.
 804                          */
 805                                 goto nomem_exit;
 806                 }
 807
 808                 skb_reset_tail_pointer(ch->trans_skb);
 809                 ch->trans_skb->len = 0;
 810                 ch->ccw[1].count = skb->len;
 811                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
 812                 atomic_dec(&skb->users);
 813                 dev_kfree_skb_irq(skb);
 814                 ccw_idx = 0;
 815                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 816                                 "up to 32 bytes sent to vtam:\n",
 817                                 __func__, dev->name, ch->trans_skb->len);
 818                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 819                                 min_t(int, 32, ch->trans_skb->len));
 820         } else {
 821                 skb_queue_tail(&ch->io_queue, skb);
 822                 ccw_idx = 3;
 823         }
 824         ch->retry = 0;
 825         fsm_newstate(ch->fsm, CTC_STATE_TX);
 826         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 827
 828         if (do_debug_ccw)
 829                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 830                                         sizeof(struct ccw1) * 3);
 831
 832         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 833         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 834         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 835                                         (unsigned long)ch, 0xff, 0);
 836         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 837         if (ccw_idx == 3)
 838                 ch->prof.doios_single++;
 839         if (rc != 0) {
 840                 fsm_deltimer(&ch->timer);
 841                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 842                 if (ccw_idx == 3)
 843                         skb_dequeue_tail(&ch->io_queue);
 844         } else if (ccw_idx == 0) {
 845                 priv->stats.tx_packets++;
 846                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 847         }
 848         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 849                 ctcmpc_send_sweep_req(ch);
 850
 851         goto done;
 852 nomem_exit:
 853         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 854                         "%s(%s): MEMORY allocation ERROR\n",
 855                         CTCM_FUNTAIL, ch->id);
 856         rc = -ENOMEM;
 857         atomic_dec(&skb->users);
 858         dev_kfree_skb_any(skb);
 859         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 860 done:
 861         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 862         return rc;
 863 }
 864
 865 /**
 866  * Start transmission of a packet.
 867  * Called from generic network device layer.
 868  *
 869  *  skb         Pointer to buffer containing the packet.
 870  *  dev         Pointer to interface struct.
 871  *
 872  * returns 0 if packet consumed, !0 if packet rejected.
 873  *         Note: If we return !0, then the packet is free'd by
 874  *               the generic network layer.
 875  */
 876 /* first merge version - leaving both functions separated */
 877 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 878 {
 879         struct ctcm_priv *priv = dev->ml_priv;
 880
 881         if (skb == NULL) {
 882                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 883                                 "%s(%s): NULL sk_buff passed",
 884                                         CTCM_FUNTAIL, dev->name);
 885                 priv->stats.tx_dropped++;
 886                 return NETDEV_TX_OK;
 887         }
 888         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 889                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 890                         "%s(%s): Got sk_buff with head room < %ld bytes",
 891                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 892                 dev_kfree_skb(skb);
 893                 priv->stats.tx_dropped++;
 894                 return NETDEV_TX_OK;
 895         }
 896
 897         /*
 898          * If channels are not running, try to restart them
 899          * and throw away packet.
 900          */
 901         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 902                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 903                 dev_kfree_skb(skb);
 904                 priv->stats.tx_dropped++;
 905                 priv->stats.tx_errors++;
 906                 priv->stats.tx_carrier_errors++;
 907                 return NETDEV_TX_OK;
 908         }
 909
 910         if (ctcm_test_and_set_busy(dev))
 911                 return NETDEV_TX_BUSY;
 912
 913         dev->trans_start = jiffies;
 914         if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0)
 915                 return NETDEV_TX_BUSY;
 916         return NETDEV_TX_OK;
 917 }
 918
 919 /* unmerged MPC variant of ctcm_tx */
 920 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 921 {
 922         int len = 0;
 923         struct ctcm_priv *priv = dev->ml_priv;
 924         struct mpc_group *grp  = priv->mpcg;
 925         struct sk_buff *newskb = NULL;
 926
 927         /*
 928          * Some sanity checks ...
 929          */
 930         if (skb == NULL) {
 931                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 932                         "%s(%s): NULL sk_buff passed",
 933                                         CTCM_FUNTAIL, dev->name);
 934                 priv->stats.tx_dropped++;
 935                                         goto done;
 936         }
 937         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 938                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 939                         "%s(%s): Got sk_buff with head room < %ld bytes",
 940                         CTCM_FUNTAIL, dev->name,
 941                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 942
 943                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 944
 945                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 946                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 947
 948                 if (!newskb) {
 949                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 950                                 "%s: %s: __dev_alloc_skb failed",
 951                                                 __func__, dev->name);
 952
 953                         dev_kfree_skb_any(skb);
 954                         priv->stats.tx_dropped++;
 955                         priv->stats.tx_errors++;
 956                         priv->stats.tx_carrier_errors++;
 957                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 958                                         goto done;
 959                 }
 960                 newskb->protocol = skb->protocol;
 961                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 962                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 963                 dev_kfree_skb_any(skb);
 964                 skb = newskb;
 965         }
 966
 967         /*
 968          * If channels are not running,
 969          * notify anybody about a link failure and throw
 970          * away packet.
 971          */
 972         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 973            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 974                 dev_kfree_skb_any(skb);
 975                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 976                         "%s(%s): inactive MPCGROUP - dropped",
 977                                         CTCM_FUNTAIL, dev->name);
 978                 priv->stats.tx_dropped++;
 979                 priv->stats.tx_errors++;
 980                 priv->stats.tx_carrier_errors++;
 981                                         goto done;
 982         }
 983
 984         if (ctcm_test_and_set_busy(dev)) {
 985                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 986                         "%s(%s): device busy - dropped",
 987                                         CTCM_FUNTAIL, dev->name);
 988                 dev_kfree_skb_any(skb);
 989                 priv->stats.tx_dropped++;
 990                 priv->stats.tx_errors++;
 991                 priv->stats.tx_carrier_errors++;
 992                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 993                                         goto done;
 994         }
 995
 996         dev->trans_start = jiffies;
 997         if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) {
 998                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 999                         "%s(%s): device error - dropped",
1000                                         CTCM_FUNTAIL, dev->name);
1001                 dev_kfree_skb_any(skb);
1002                 priv->stats.tx_dropped++;
1003                 priv->stats.tx_errors++;
1004                 priv->stats.tx_carrier_errors++;
1005                 ctcm_clear_busy(dev);
1006                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1007                                         goto done;
1008         }
1009         ctcm_clear_busy(dev);
1010 done:
1011         if (do_debug)
1012                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1013
1014         return NETDEV_TX_OK;    /* handle freeing of skb here */
1015 }
1016
1017
1018 /**
1019  * Sets MTU of an interface.
1020  *
1021  *  dev         Pointer to interface struct.
1022  *  new_mtu     The new MTU to use for this interface.
1023  *
1024  * returns 0 on success, -EINVAL if MTU is out of valid range.
1025  *         (valid range is 576 .. 65527). If VM is on the
1026  *         remote side, maximum MTU is 32760, however this is
1027  *         not checked here.
1028  */
1029 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1030 {
1031         struct ctcm_priv *priv;
1032         int max_bufsize;
1033
1034         if (new_mtu < 576 || new_mtu > 65527)
1035                 return -EINVAL;
1036
1037         priv = dev->ml_priv;
1038         max_bufsize = priv->channel[READ]->max_bufsize;
1039
1040         if (IS_MPC(priv)) {
1041                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1042                         return -EINVAL;
1043                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1044         } else {
1045                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1046                         return -EINVAL;
1047                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1048         }
1049         dev->mtu = new_mtu;
1050         return 0;
1051 }
1052
1053 /**
1054  * Returns interface statistics of a device.
1055  *
1056  *  dev         Pointer to interface struct.
1057  *
1058  * returns Pointer to stats struct of this interface.
1059  */
1060 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1061 {
1062         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1063 }
1064
1065 static void ctcm_free_netdevice(struct net_device *dev)
1066 {
1067         struct ctcm_priv *priv;
1068         struct mpc_group *grp;
1069
1070         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1071                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1072         priv = dev->ml_priv;
1073         if (priv) {
1074                 grp = priv->mpcg;
1075                 if (grp) {
1076                         if (grp->fsm)
1077                                 kfree_fsm(grp->fsm);
1078                         if (grp->xid_skb)
1079                                 dev_kfree_skb(grp->xid_skb);
1080                         if (grp->rcvd_xid_skb)
1081                                 dev_kfree_skb(grp->rcvd_xid_skb);
1082                         tasklet_kill(&grp->mpc_tasklet2);
1083                         kfree(grp);
1084                         priv->mpcg = NULL;
1085                 }
1086                 if (priv->fsm) {
1087                         kfree_fsm(priv->fsm);
1088                         priv->fsm = NULL;
1089                 }
1090                 kfree(priv->xid);
1091                 priv->xid = NULL;
1092         /*
1093          * Note: kfree(priv); is done in "opposite" function of
1094          * allocator function probe_device which is remove_device.
1095          */
1096         }
1097 #ifdef MODULE
1098         free_netdev(dev);
1099 #endif
1100 }
1101
1102 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1103
1104 static const struct net_device_ops ctcm_netdev_ops = {
1105         .ndo_open               = ctcm_open,
1106         .ndo_stop               = ctcm_close,
1107         .ndo_get_stats          = ctcm_stats,
1108         .ndo_change_mtu         = ctcm_change_mtu,
1109         .ndo_start_xmit         = ctcm_tx,
1110 };
1111
1112 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1113         .ndo_open               = ctcm_open,
1114         .ndo_stop               = ctcm_close,
1115         .ndo_get_stats          = ctcm_stats,
1116         .ndo_change_mtu         = ctcm_change_mtu,
1117         .ndo_start_xmit         = ctcmpc_tx,
1118 };
1119
1120 void static ctcm_dev_setup(struct net_device *dev)
1121 {
1122         dev->type = ARPHRD_SLIP;
1123         dev->tx_queue_len = 100;
1124         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1125 }
1126
1127 /*
1128  * Initialize everything of the net device except the name and the
1129  * channel structs.
1130  */
1131 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1132 {
1133         struct net_device *dev;
1134         struct mpc_group *grp;
1135         if (!priv)
1136                 return NULL;
1137
1138         if (IS_MPC(priv))
1139                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1140         else
1141                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1142
1143         if (!dev) {
1144                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1145                         "%s: MEMORY allocation ERROR",
1146                         CTCM_FUNTAIL);
1147                 return NULL;
1148         }
1149         dev->ml_priv = priv;
1150         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1151                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1152                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1153         if (priv->fsm == NULL) {
1154                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1155                 kfree(dev);
1156                 return NULL;
1157         }
1158         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1159         fsm_settimer(priv->fsm, &priv->restart_timer);
1160
1161         if (IS_MPC(priv)) {
1162                 /*  MPC Group Initializations  */
1163                 grp = ctcmpc_init_mpc_group(priv);
1164                 if (grp == NULL) {
1165                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1166                         kfree(dev);
1167                         return NULL;
1168                 }
1169                 tasklet_init(&grp->mpc_tasklet2,
1170                                 mpc_group_ready, (unsigned long)dev);
1171                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1172                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1173
1174                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1175                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1176                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1177         } else {
1178                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1179                 dev->netdev_ops = &ctcm_netdev_ops;
1180                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1181         }
1182
1183         CTCMY_DBF_DEV(SETUP, dev, "finished");
1184
1185         return dev;
1186 }
1187
1188 /**
1189  * Main IRQ handler.
1190  *
1191  *  cdev        The ccw_device the interrupt is for.
1192  *  intparm     interruption parameter.
1193  *  irb         interruption response block.
1194  */
1195 static void ctcm_irq_handler(struct ccw_device *cdev,
1196                                 unsigned long intparm, struct irb *irb)
1197 {
1198         struct channel          *ch;
1199         struct net_device       *dev;
1200         struct ctcm_priv        *priv;
1201         struct ccwgroup_device  *cgdev;
1202         int cstat;
1203         int dstat;
1204
1205         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1206                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1207
1208         if (ctcm_check_irb_error(cdev, irb))
1209                 return;
1210
1211         cgdev = dev_get_drvdata(&cdev->dev);
1212
1213         cstat = irb->scsw.cmd.cstat;
1214         dstat = irb->scsw.cmd.dstat;
1215
1216         /* Check for unsolicited interrupts. */
1217         if (cgdev == NULL) {
1218                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1219                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1220                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1221                 dev_warn(&cdev->dev,
1222                         "The adapter received a non-specific IRQ\n");
1223                 return;
1224         }
1225
1226         priv = dev_get_drvdata(&cgdev->dev);
1227
1228         /* Try to extract channel from driver data. */
1229         if (priv->channel[READ]->cdev == cdev)
1230                 ch = priv->channel[READ];
1231         else if (priv->channel[WRITE]->cdev == cdev)
1232                 ch = priv->channel[WRITE];
1233         else {
1234                 dev_err(&cdev->dev,
1235                         "%s: Internal error: Can't determine channel for "
1236                         "interrupt device %s\n",
1237                         __func__, dev_name(&cdev->dev));
1238                         /* Explain: inconsistent internal structures */
1239                 return;
1240         }
1241
1242         dev = ch->netdev;
1243         if (dev == NULL) {
1244                 dev_err(&cdev->dev,
1245                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1246                         __func__, ch);
1247                         /* Explain: inconsistent internal structures */
1248                 return;
1249         }
1250
1251         /* Copy interruption response block. */
1252         memcpy(ch->irb, irb, sizeof(struct irb));
1253
1254         /* Issue error message and return on subchannel error code */
1255         if (irb->scsw.cmd.cstat) {
1256                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1257                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1258                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1259                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1260                 dev_warn(&cdev->dev,
1261                                 "A check occurred on the subchannel\n");
1262                 return;
1263         }
1264
1265         /* Check the reason-code of a unit check */
1266         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1267                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1268                         /* print it only once */
1269                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1270                                 "%s(%s): sense=%02x, ds=%02x",
1271                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1272                 ccw_unit_check(ch, irb->ecw[0]);
1273                 return;
1274         }
1275         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1276                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1277                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1278                 else
1279                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1280                 return;
1281         }
1282         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1283                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1284                 return;
1285         }
1286         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1287             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1288             (irb->scsw.cmd.stctl ==
1289              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1290                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1291         else
1292                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1293
1294 }
1295
1296 /**
1297  * Add ctcm specific attributes.
1298  * Add ctcm private data.
1299  *
1300  *  cgdev       pointer to ccwgroup_device just added
1301  *
1302  * returns 0 on success, !0 on failure.
1303  */
1304 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1305 {
1306         struct ctcm_priv *priv;
1307         int rc;
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
1325         rc = ctcm_add_files(&cgdev->dev);
1326         if (rc) {
1327                 kfree(priv);
1328                 put_device(&cgdev->dev);
1329                 return rc;
1330         }
1331         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1332         cgdev->cdev[0]->handler = ctcm_irq_handler;
1333         cgdev->cdev[1]->handler = ctcm_irq_handler;
1334         dev_set_drvdata(&cgdev->dev, priv);
1335
1336         return 0;
1337 }
1338
1339 /**
1340  * Add a new channel to the list of channels.
1341  * Keeps the channel list sorted.
1342  *
1343  *  cdev        The ccw_device to be added.
1344  *  type        The type class of the new channel.
1345  *  priv        Points to the private data of the ccwgroup_device.
1346  *
1347  * returns 0 on success, !0 on error.
1348  */
1349 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1350                                 struct ctcm_priv *priv)
1351 {
1352         struct channel **c = &channels;
1353         struct channel *ch;
1354         int ccw_num;
1355         int rc = 0;
1356
1357         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1358                 "%s(%s), type %d, proto %d",
1359                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1360
1361         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1362         if (ch == NULL)
1363                 return -ENOMEM;
1364
1365         ch->protocol = priv->protocol;
1366         if (IS_MPC(priv)) {
1367                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1368                 if (ch->discontact_th == NULL)
1369                                         goto nomem_return;
1370
1371                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1372                 tasklet_init(&ch->ch_disc_tasklet,
1373                         mpc_action_send_discontact, (unsigned long)ch);
1374
1375                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1376                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1377                 ccw_num = 17;
1378         } else
1379                 ccw_num = 8;
1380
1381         ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1382         if (ch->ccw == NULL)
1383                                         goto nomem_return;
1384
1385         ch->cdev = cdev;
1386         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1387         ch->type = type;
1388
1389         /**
1390          * "static" ccws are used in the following way:
1391          *
1392          * ccw[0..2] (Channel program for generic I/O):
1393          *           0: prepare
1394          *           1: read or write (depending on direction) with fixed
1395          *              buffer (idal allocated once when buffer is allocated)
1396          *           2: nop
1397          * ccw[3..5] (Channel program for direct write of packets)
1398          *           3: prepare
1399          *           4: write (idal allocated on every write).
1400          *           5: nop
1401          * ccw[6..7] (Channel program for initial channel setup):
1402          *           6: set extended mode
1403          *           7: nop
1404          *
1405          * ch->ccw[0..5] are initialized in ch_action_start because
1406          * the channel's direction is yet unknown here.
1407          *
1408          * ccws used for xid2 negotiations
1409          *  ch-ccw[8-14] need to be used for the XID exchange either
1410          *    X side XID2 Processing
1411          *       8:  write control
1412          *       9:  write th
1413          *           10: write XID
1414          *           11: read th from secondary
1415          *           12: read XID   from secondary
1416          *           13: read 4 byte ID
1417          *           14: nop
1418          *    Y side XID Processing
1419          *           8:  sense
1420          *       9:  read th
1421          *           10: read XID
1422          *           11: write th
1423          *           12: write XID
1424          *           13: write 4 byte ID
1425          *           14: nop
1426          *
1427          *  ccws used for double noop due to VM timing issues
1428          *  which result in unrecoverable Busy on channel
1429          *       15: nop
1430          *       16: nop
1431          */
1432         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1433         ch->ccw[6].flags        = CCW_FLAG_SLI;
1434
1435         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1436         ch->ccw[7].flags        = CCW_FLAG_SLI;
1437
1438         if (IS_MPC(priv)) {
1439                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1440                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1441                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1442                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1443
1444                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1445                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1446
1447                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1448                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1449                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1450                                 mpc_ch_fsm_len, GFP_KERNEL);
1451         } else {
1452                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1453                                 ctc_ch_event_names, CTC_NR_STATES,
1454                                 CTC_NR_EVENTS, ch_fsm,
1455                                 ch_fsm_len, GFP_KERNEL);
1456         }
1457         if (ch->fsm == NULL)
1458                                 goto free_return;
1459
1460         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1461
1462         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1463         if (ch->irb == NULL)
1464                                 goto nomem_return;
1465
1466         while (*c && ctcm_less_than((*c)->id, ch->id))
1467                 c = &(*c)->next;
1468
1469         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1470                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1471                                 "%s (%s) already in list, using old entry",
1472                                 __func__, (*c)->id);
1473
1474                                 goto free_return;
1475         }
1476
1477         spin_lock_init(&ch->collect_lock);
1478
1479         fsm_settimer(ch->fsm, &ch->timer);
1480         skb_queue_head_init(&ch->io_queue);
1481         skb_queue_head_init(&ch->collect_queue);
1482
1483         if (IS_MPC(priv)) {
1484                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1485                 skb_queue_head_init(&ch->sweep_queue);
1486         }
1487         ch->next = *c;
1488         *c = ch;
1489         return 0;
1490
1491 nomem_return:
1492         rc = -ENOMEM;
1493
1494 free_return:    /* note that all channel pointers are 0 or valid */
1495         kfree(ch->ccw);
1496         kfree(ch->discontact_th);
1497         kfree_fsm(ch->fsm);
1498         kfree(ch->irb);
1499         kfree(ch);
1500         return rc;
1501 }
1502
1503 /*
1504  * Return type of a detected device.
1505  */
1506 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1507 {
1508         enum ctcm_channel_types type;
1509         type = (enum ctcm_channel_types)id->driver_info;
1510
1511         if (type == ctcm_channel_type_ficon)
1512                 type = ctcm_channel_type_escon;
1513
1514         return type;
1515 }
1516
1517 /**
1518  *
1519  * Setup an interface.
1520  *
1521  *  cgdev       Device to be setup.
1522  *
1523  * returns 0 on success, !0 on failure.
1524  */
1525 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1526 {
1527         char read_id[CTCM_ID_SIZE];
1528         char write_id[CTCM_ID_SIZE];
1529         int direction;
1530         enum ctcm_channel_types type;
1531         struct ctcm_priv *priv;
1532         struct net_device *dev;
1533         struct ccw_device *cdev0;
1534         struct ccw_device *cdev1;
1535         struct channel *readc;
1536         struct channel *writec;
1537         int ret;
1538         int result;
1539
1540         priv = dev_get_drvdata(&cgdev->dev);
1541         if (!priv) {
1542                 result = -ENODEV;
1543                 goto out_err_result;
1544         }
1545
1546         cdev0 = cgdev->cdev[0];
1547         cdev1 = cgdev->cdev[1];
1548
1549         type = get_channel_type(&cdev0->id);
1550
1551         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1552         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1553
1554         ret = add_channel(cdev0, type, priv);
1555         if (ret) {
1556                 result = ret;
1557                 goto out_err_result;
1558         }
1559         ret = add_channel(cdev1, type, priv);
1560         if (ret) {
1561                 result = ret;
1562                 goto out_remove_channel1;
1563         }
1564
1565         ret = ccw_device_set_online(cdev0);
1566         if (ret != 0) {
1567                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1568                         "%s(%s) set_online rc=%d",
1569                                 CTCM_FUNTAIL, read_id, ret);
1570                 result = -EIO;
1571                 goto out_remove_channel2;
1572         }
1573
1574         ret = ccw_device_set_online(cdev1);
1575         if (ret != 0) {
1576                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1577                         "%s(%s) set_online rc=%d",
1578                                 CTCM_FUNTAIL, write_id, ret);
1579
1580                 result = -EIO;
1581                 goto out_ccw1;
1582         }
1583
1584         dev = ctcm_init_netdevice(priv);
1585         if (dev == NULL) {
1586                 result = -ENODEV;
1587                 goto out_ccw2;
1588         }
1589
1590         for (direction = READ; direction <= WRITE; direction++) {
1591                 priv->channel[direction] =
1592                     channel_get(type, direction == READ ? read_id : write_id,
1593                                 direction);
1594                 if (priv->channel[direction] == NULL) {
1595                         if (direction == WRITE)
1596                                 channel_free(priv->channel[READ]);
1597                         goto out_dev;
1598                 }
1599                 priv->channel[direction]->netdev = dev;
1600                 priv->channel[direction]->protocol = priv->protocol;
1601                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1602         }
1603         /* sysfs magic */
1604         SET_NETDEV_DEV(dev, &cgdev->dev);
1605
1606         if (register_netdev(dev)) {
1607                 result = -ENODEV;
1608                 goto out_dev;
1609         }
1610
1611         if (ctcm_add_attributes(&cgdev->dev)) {
1612                 result = -ENODEV;
1613                 goto out_unregister;
1614         }
1615
1616         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1617
1618         dev_info(&dev->dev,
1619                 "setup OK : r/w = %s/%s, protocol : %d\n",
1620                         priv->channel[READ]->id,
1621                         priv->channel[WRITE]->id, priv->protocol);
1622
1623         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1624                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1625                         priv->channel[READ]->id,
1626                         priv->channel[WRITE]->id, priv->protocol);
1627
1628         return 0;
1629 out_unregister:
1630         unregister_netdev(dev);
1631 out_dev:
1632         ctcm_free_netdevice(dev);
1633 out_ccw2:
1634         ccw_device_set_offline(cgdev->cdev[1]);
1635 out_ccw1:
1636         ccw_device_set_offline(cgdev->cdev[0]);
1637 out_remove_channel2:
1638         readc = channel_get(type, read_id, READ);
1639         channel_remove(readc);
1640 out_remove_channel1:
1641         writec = channel_get(type, write_id, WRITE);
1642         channel_remove(writec);
1643 out_err_result:
1644         return result;
1645 }
1646
1647 /**
1648  * Shutdown an interface.
1649  *
1650  *  cgdev       Device to be shut down.
1651  *
1652  * returns 0 on success, !0 on failure.
1653  */
1654 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1655 {
1656         struct ctcm_priv *priv;
1657         struct net_device *dev;
1658
1659         priv = dev_get_drvdata(&cgdev->dev);
1660         if (!priv)
1661                 return -ENODEV;
1662
1663         if (priv->channel[READ]) {
1664                 dev = priv->channel[READ]->netdev;
1665                 CTCM_DBF_DEV(SETUP, dev, "");
1666                 /* Close the device */
1667                 ctcm_close(dev);
1668                 dev->flags &= ~IFF_RUNNING;
1669                 ctcm_remove_attributes(&cgdev->dev);
1670                 channel_free(priv->channel[READ]);
1671         } else
1672                 dev = NULL;
1673
1674         if (priv->channel[WRITE])
1675                 channel_free(priv->channel[WRITE]);
1676
1677         if (dev) {
1678                 unregister_netdev(dev);
1679                 ctcm_free_netdevice(dev);
1680         }
1681
1682         if (priv->fsm)
1683                 kfree_fsm(priv->fsm);
1684
1685         ccw_device_set_offline(cgdev->cdev[1]);
1686         ccw_device_set_offline(cgdev->cdev[0]);
1687
1688         if (priv->channel[READ])
1689                 channel_remove(priv->channel[READ]);
1690         if (priv->channel[WRITE])
1691                 channel_remove(priv->channel[WRITE]);
1692         priv->channel[READ] = priv->channel[WRITE] = NULL;
1693
1694         return 0;
1695
1696 }
1697
1698
1699 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1700 {
1701         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1702
1703         BUG_ON(priv == NULL);
1704
1705         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1706                         "removing device %p, proto : %d",
1707                         cgdev, priv->protocol);
1708
1709         if (cgdev->state == CCWGROUP_ONLINE)
1710                 ctcm_shutdown_device(cgdev);
1711         ctcm_remove_files(&cgdev->dev);
1712         dev_set_drvdata(&cgdev->dev, NULL);
1713         kfree(priv);
1714         put_device(&cgdev->dev);
1715 }
1716
1717 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1718 {
1719         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1720
1721         if (gdev->state == CCWGROUP_OFFLINE)
1722                 return 0;
1723         netif_device_detach(priv->channel[READ]->netdev);
1724         ctcm_close(priv->channel[READ]->netdev);
1725         if (!wait_event_timeout(priv->fsm->wait_q,
1726             fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1727                 netif_device_attach(priv->channel[READ]->netdev);
1728                 return -EBUSY;
1729         }
1730         ccw_device_set_offline(gdev->cdev[1]);
1731         ccw_device_set_offline(gdev->cdev[0]);
1732         return 0;
1733 }
1734
1735 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1736 {
1737         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1738         int rc;
1739
1740         if (gdev->state == CCWGROUP_OFFLINE)
1741                 return 0;
1742         rc = ccw_device_set_online(gdev->cdev[1]);
1743         if (rc)
1744                 goto err_out;
1745         rc = ccw_device_set_online(gdev->cdev[0]);
1746         if (rc)
1747                 goto err_out;
1748         ctcm_open(priv->channel[READ]->netdev);
1749 err_out:
1750         netif_device_attach(priv->channel[READ]->netdev);
1751         return rc;
1752 }
1753
1754 static struct ccw_device_id ctcm_ids[] = {
1755         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1756         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1757         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1758         {},
1759 };
1760 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1761
1762 static struct ccw_driver ctcm_ccw_driver = {
1763         .owner  = THIS_MODULE,
1764         .name   = "ctcm",
1765         .ids    = ctcm_ids,
1766         .probe  = ccwgroup_probe_ccwdev,
1767         .remove = ccwgroup_remove_ccwdev,
1768 };
1769
1770 static struct ccwgroup_driver ctcm_group_driver = {
1771         .owner       = THIS_MODULE,
1772         .name        = CTC_DRIVER_NAME,
1773         .max_slaves  = 2,
1774         .driver_id   = 0xC3E3C3D4,      /* CTCM */
1775         .probe       = ctcm_probe_device,
1776         .remove      = ctcm_remove_device,
1777         .set_online  = ctcm_new_device,
1778         .set_offline = ctcm_shutdown_device,
1779         .freeze      = ctcm_pm_suspend,
1780         .thaw        = ctcm_pm_resume,
1781         .restore     = ctcm_pm_resume,
1782 };
1783
1784 static ssize_t
1785 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1786                         size_t count)
1787 {
1788         int err;
1789
1790         err = ccwgroup_create_from_string(ctcm_root_dev,
1791                                           ctcm_group_driver.driver_id,
1792                                           &ctcm_ccw_driver, 2, buf);
1793         return err ? err : count;
1794 }
1795
1796 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1797
1798 static struct attribute *ctcm_group_attrs[] = {
1799         &driver_attr_group.attr,
1800         NULL,
1801 };
1802
1803 static struct attribute_group ctcm_group_attr_group = {
1804         .attrs = ctcm_group_attrs,
1805 };
1806
1807 static const struct attribute_group *ctcm_group_attr_groups[] = {
1808         &ctcm_group_attr_group,
1809         NULL,
1810 };
1811
1812 /*
1813  * Module related routines
1814  */
1815
1816 /*
1817  * Prepare to be unloaded. Free IRQ's and release all resources.
1818  * This is called just before this module is unloaded. It is
1819  * not called, if the usage count is !0, so we don't need to check
1820  * for that.
1821  */
1822 static void __exit ctcm_exit(void)
1823 {
1824         driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1825         ccwgroup_driver_unregister(&ctcm_group_driver);
1826         ccw_driver_unregister(&ctcm_ccw_driver);
1827         root_device_unregister(ctcm_root_dev);
1828         ctcm_unregister_dbf_views();
1829         pr_info("CTCM driver unloaded\n");
1830 }
1831
1832 /*
1833  * Print Banner.
1834  */
1835 static void print_banner(void)
1836 {
1837         pr_info("CTCM driver initialized\n");
1838 }
1839
1840 /**
1841  * Initialize module.
1842  * This is called just after the module is loaded.
1843  *
1844  * returns 0 on success, !0 on error.
1845  */
1846 static int __init ctcm_init(void)
1847 {
1848         int ret;
1849
1850         channels = NULL;
1851
1852         ret = ctcm_register_dbf_views();
1853         if (ret)
1854                 goto out_err;
1855         ctcm_root_dev = root_device_register("ctcm");
1856         ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1857         if (ret)
1858                 goto register_err;
1859         ret = ccw_driver_register(&ctcm_ccw_driver);
1860         if (ret)
1861                 goto ccw_err;
1862         ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1863         ret = ccwgroup_driver_register(&ctcm_group_driver);
1864         if (ret)
1865                 goto ccwgroup_err;
1866         print_banner();
1867         return 0;
1868
1869 ccwgroup_err:
1870         ccw_driver_unregister(&ctcm_ccw_driver);
1871 ccw_err:
1872         root_device_unregister(ctcm_root_dev);
1873 register_err:
1874         ctcm_unregister_dbf_views();
1875 out_err:
1876         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1877                 __func__, ret);
1878         return ret;
1879 }
1880
1881 module_init(ctcm_init);
1882 module_exit(ctcm_exit);
1883
1884 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1885 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1886 MODULE_LICENSE("GPL");
1887