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 == CTCM_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) == CTCM_READ) ?
 392                                 "RX" : "TX");
 393                 return -ENOMEM;
 394         }
 395
 396         ch->ccw[1].count = ch->max_bufsize;
 397         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 398                 dev_kfree_skb(ch->trans_skb);
 399                 ch->trans_skb = NULL;
 400                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 401                         "%s(%s): %s set norm_cda failed",
 402                         CTCM_FUNTAIL, ch->id,
 403                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 404                                 "RX" : "TX");
 405                 return -ENOMEM;
 406         }
 407
 408         ch->ccw[1].count = 0;
 409         ch->trans_skb_data = ch->trans_skb->data;
 410         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 411         return 0;
 412 }
 413
 414 /*
 415  * Interface API for upper network layers
 416  */
 417
 418 /**
 419  * Open an interface.
 420  * Called from generic network layer when ifconfig up is run.
 421  *
 422  *  dev         Pointer to interface struct.
 423  *
 424  * returns 0 on success, -ERRNO on failure. (Never fails.)
 425  */
 426 int ctcm_open(struct net_device *dev)
 427 {
 428         struct ctcm_priv *priv = dev->ml_priv;
 429
 430         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 431         if (!IS_MPC(priv))
 432                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 433         return 0;
 434 }
 435
 436 /**
 437  * Close an interface.
 438  * Called from generic network layer when ifconfig down is run.
 439  *
 440  *  dev         Pointer to interface struct.
 441  *
 442  * returns 0 on success, -ERRNO on failure. (Never fails.)
 443  */
 444 int ctcm_close(struct net_device *dev)
 445 {
 446         struct ctcm_priv *priv = dev->ml_priv;
 447
 448         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 449         if (!IS_MPC(priv))
 450                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 451         return 0;
 452 }
 453
 454
 455 /**
 456  * Transmit a packet.
 457  * This is a helper function for ctcm_tx().
 458  *
 459  *  ch          Channel to be used for sending.
 460  *  skb         Pointer to struct sk_buff of packet to send.
 461  *            The linklevel header has already been set up
 462  *            by ctcm_tx().
 463  *
 464  * returns 0 on success, -ERRNO on failure. (Never fails.)
 465  */
 466 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 467 {
 468         unsigned long saveflags;
 469         struct ll_header header;
 470         int rc = 0;
 471         __u16 block_len;
 472         int ccw_idx;
 473         struct sk_buff *nskb;
 474         unsigned long hi;
 475
 476         /* we need to acquire the lock for testing the state
 477          * otherwise we can have an IRQ changing the state to
 478          * TXIDLE after the test but before acquiring the lock.
 479          */
 480         spin_lock_irqsave(&ch->collect_lock, saveflags);
 481         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 482                 int l = skb->len + LL_HEADER_LENGTH;
 483
 484                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 485                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 486                         return -EBUSY;
 487                 } else {
 488                         atomic_inc(&skb->users);
 489                         header.length = l;
 490                         header.type = skb->protocol;
 491                         header.unused = 0;
 492                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 493                                LL_HEADER_LENGTH);
 494                         skb_queue_tail(&ch->collect_queue, skb);
 495                         ch->collect_len += l;
 496                 }
 497                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 498                                 goto done;
 499         }
 500         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 501         /*
 502          * Protect skb against beeing free'd by upper
 503          * layers.
 504          */
 505         atomic_inc(&skb->users);
 506         ch->prof.txlen += skb->len;
 507         header.length = skb->len + LL_HEADER_LENGTH;
 508         header.type = skb->protocol;
 509         header.unused = 0;
 510         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 511         block_len = skb->len + 2;
 512         *((__u16 *)skb_push(skb, 2)) = block_len;
 513
 514         /*
 515          * IDAL support in CTCM is broken, so we have to
 516          * care about skb's above 2G ourselves.
 517          */
 518         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 519         if (hi) {
 520                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 521                 if (!nskb) {
 522                         atomic_dec(&skb->users);
 523                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 524                         ctcm_clear_busy(ch->netdev);
 525                         return -ENOMEM;
 526                 } else {
 527                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 528                         atomic_inc(&nskb->users);
 529                         atomic_dec(&skb->users);
 530                         dev_kfree_skb_irq(skb);
 531                         skb = nskb;
 532                 }
 533         }
 534
 535         ch->ccw[4].count = block_len;
 536         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 537                 /*
 538                  * idal allocation failed, try via copying to
 539                  * trans_skb. trans_skb usually has a pre-allocated
 540                  * idal.
 541                  */
 542                 if (ctcm_checkalloc_buffer(ch)) {
 543                         /*
 544                          * Remove our header. It gets added
 545                          * again on retransmit.
 546                          */
 547                         atomic_dec(&skb->users);
 548                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 549                         ctcm_clear_busy(ch->netdev);
 550                         return -ENOMEM;
 551                 }
 552
 553                 skb_reset_tail_pointer(ch->trans_skb);
 554                 ch->trans_skb->len = 0;
 555                 ch->ccw[1].count = skb->len;
 556                 skb_copy_from_linear_data(skb,
 557                                 skb_put(ch->trans_skb, skb->len), skb->len);
 558                 atomic_dec(&skb->users);
 559                 dev_kfree_skb_irq(skb);
 560                 ccw_idx = 0;
 561         } else {
 562                 skb_queue_tail(&ch->io_queue, skb);
 563                 ccw_idx = 3;
 564         }
 565         if (do_debug_ccw)
 566                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 567                                         sizeof(struct ccw1) * 3);
 568         ch->retry = 0;
 569         fsm_newstate(ch->fsm, CTC_STATE_TX);
 570         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 571         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 572         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 573         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 574                                         (unsigned long)ch, 0xff, 0);
 575         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 576         if (ccw_idx == 3)
 577                 ch->prof.doios_single++;
 578         if (rc != 0) {
 579                 fsm_deltimer(&ch->timer);
 580                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 581                 if (ccw_idx == 3)
 582                         skb_dequeue_tail(&ch->io_queue);
 583                 /*
 584                  * Remove our header. It gets added
 585                  * again on retransmit.
 586                  */
 587                 skb_pull(skb, LL_HEADER_LENGTH + 2);
 588         } else if (ccw_idx == 0) {
 589                 struct net_device *dev = ch->netdev;
 590                 struct ctcm_priv *priv = dev->ml_priv;
 591                 priv->stats.tx_packets++;
 592                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 593         }
 594 done:
 595         ctcm_clear_busy(ch->netdev);
 596         return rc;
 597 }
 598
 599 static void ctcmpc_send_sweep_req(struct channel *rch)
 600 {
 601         struct net_device *dev = rch->netdev;
 602         struct ctcm_priv *priv;
 603         struct mpc_group *grp;
 604         struct th_sweep *header;
 605         struct sk_buff *sweep_skb;
 606         struct channel *ch;
 607         /* int rc = 0; */
 608
 609         priv = dev->ml_priv;
 610         grp = priv->mpcg;
 611         ch = priv->channel[CTCM_WRITE];
 612
 613         /* sweep processing is not complete until response and request */
 614         /* has completed for all read channels in group                */
 615         if (grp->in_sweep == 0) {
 616                 grp->in_sweep = 1;
 617                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 618                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 619         }
 620
 621         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 622
 623         if (sweep_skb == NULL)  {
 624                 /* rc = -ENOMEM; */
 625                                 goto nomem;
 626         }
 627
 628         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 629
 630         if (!header) {
 631                 dev_kfree_skb_any(sweep_skb);
 632                 /* rc = -ENOMEM; */
 633                                 goto nomem;
 634         }
 635
 636         header->th.th_seg       = 0x00 ;
 637         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 638         header->th.th_blk_flag  = 0x00;
 639         header->th.th_is_xid    = 0x00;
 640         header->th.th_seq_num   = 0x00;
 641         header->sw.th_last_seq  = ch->th_seq_num;
 642
 643         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 644
 645         kfree(header);
 646
 647         dev->trans_start = jiffies;
 648         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 649
 650         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 651
 652         return;
 653
 654 nomem:
 655         grp->in_sweep = 0;
 656         ctcm_clear_busy(dev);
 657         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 658
 659         return;
 660 }
 661
 662 /*
 663  * MPC mode version of transmit_skb
 664  */
 665 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 666 {
 667         struct pdu *p_header;
 668         struct net_device *dev = ch->netdev;
 669         struct ctcm_priv *priv = dev->ml_priv;
 670         struct mpc_group *grp = priv->mpcg;
 671         struct th_header *header;
 672         struct sk_buff *nskb;
 673         int rc = 0;
 674         int ccw_idx;
 675         unsigned long hi;
 676         unsigned long saveflags = 0;    /* avoids compiler warning */
 677
 678         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 679                         __func__, dev->name, smp_processor_id(), ch,
 680                                         ch->id, fsm_getstate_str(ch->fsm));
 681
 682         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 683                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 684                 atomic_inc(&skb->users);
 685                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 686
 687                 if (!p_header) {
 688                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 689                                 goto nomem_exit;
 690                 }
 691
 692                 p_header->pdu_offset = skb->len;
 693                 p_header->pdu_proto = 0x01;
 694                 p_header->pdu_flag = 0x00;
 695                 if (skb->protocol == ntohs(ETH_P_SNAP)) {
 696                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 697                 } else {
 698                         p_header->pdu_flag |= PDU_FIRST;
 699                 }
 700                 p_header->pdu_seq = 0;
 701                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 702                        PDU_HEADER_LENGTH);
 703
 704                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 705                                 "pdu header and data for up to 32 bytes:\n",
 706                                 __func__, dev->name, skb->len);
 707                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 708
 709                 skb_queue_tail(&ch->collect_queue, skb);
 710                 ch->collect_len += skb->len;
 711                 kfree(p_header);
 712
 713                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 714                         goto done;
 715         }
 716
 717         /*
 718          * Protect skb against beeing free'd by upper
 719          * layers.
 720          */
 721         atomic_inc(&skb->users);
 722
 723         /*
 724          * IDAL support in CTCM is broken, so we have to
 725          * care about skb's above 2G ourselves.
 726          */
 727         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 728         if (hi) {
 729                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 730                 if (!nskb) {
 731                         goto nomem_exit;
 732                 } else {
 733                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 734                         atomic_inc(&nskb->users);
 735                         atomic_dec(&skb->users);
 736                         dev_kfree_skb_irq(skb);
 737                         skb = nskb;
 738                 }
 739         }
 740
 741         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 742
 743         if (!p_header)
 744                 goto nomem_exit;
 745
 746         p_header->pdu_offset = skb->len;
 747         p_header->pdu_proto = 0x01;
 748         p_header->pdu_flag = 0x00;
 749         p_header->pdu_seq = 0;
 750         if (skb->protocol == ntohs(ETH_P_SNAP)) {
 751                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 752         } else {
 753                 p_header->pdu_flag |= PDU_FIRST;
 754         }
 755         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 756
 757         kfree(p_header);
 758
 759         if (ch->collect_len > 0) {
 760                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 761                 skb_queue_tail(&ch->collect_queue, skb);
 762                 ch->collect_len += skb->len;
 763                 skb = skb_dequeue(&ch->collect_queue);
 764                 ch->collect_len -= skb->len;
 765                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 766         }
 767
 768         p_header = (struct pdu *)skb->data;
 769         p_header->pdu_flag |= PDU_LAST;
 770
 771         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 772
 773         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 774         if (!header)
 775                 goto nomem_exit;
 776
 777         header->th_seg = 0x00;
 778         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 779         header->th_blk_flag = 0x00;
 780         header->th_is_xid = 0x00;          /* Just data here */
 781         ch->th_seq_num++;
 782         header->th_seq_num = ch->th_seq_num;
 783
 784         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 785                        __func__, dev->name, ch->th_seq_num);
 786
 787         /* put the TH on the packet */
 788         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 789
 790         kfree(header);
 791
 792         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 793                         "up to 32 bytes sent to vtam:\n",
 794                                 __func__, dev->name, skb->len);
 795         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 796
 797         ch->ccw[4].count = skb->len;
 798         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 799                 /*
 800                  * idal allocation failed, try via copying to trans_skb.
 801                  * trans_skb usually has a pre-allocated idal.
 802                  */
 803                 if (ctcm_checkalloc_buffer(ch)) {
 804                         /*
 805                          * Remove our header.
 806                          * It gets added again on retransmit.
 807                          */
 808                                 goto nomem_exit;
 809                 }
 810
 811                 skb_reset_tail_pointer(ch->trans_skb);
 812                 ch->trans_skb->len = 0;
 813                 ch->ccw[1].count = skb->len;
 814                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
 815                 atomic_dec(&skb->users);
 816                 dev_kfree_skb_irq(skb);
 817                 ccw_idx = 0;
 818                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 819                                 "up to 32 bytes sent to vtam:\n",
 820                                 __func__, dev->name, ch->trans_skb->len);
 821                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 822                                 min_t(int, 32, ch->trans_skb->len));
 823         } else {
 824                 skb_queue_tail(&ch->io_queue, skb);
 825                 ccw_idx = 3;
 826         }
 827         ch->retry = 0;
 828         fsm_newstate(ch->fsm, CTC_STATE_TX);
 829         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 830
 831         if (do_debug_ccw)
 832                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 833                                         sizeof(struct ccw1) * 3);
 834
 835         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 836         ch->prof.send_stamp = current_kernel_time(); /* xtime */
 837         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 838                                         (unsigned long)ch, 0xff, 0);
 839         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 840         if (ccw_idx == 3)
 841                 ch->prof.doios_single++;
 842         if (rc != 0) {
 843                 fsm_deltimer(&ch->timer);
 844                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 845                 if (ccw_idx == 3)
 846                         skb_dequeue_tail(&ch->io_queue);
 847         } else if (ccw_idx == 0) {
 848                 priv->stats.tx_packets++;
 849                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 850         }
 851         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 852                 ctcmpc_send_sweep_req(ch);
 853
 854         goto done;
 855 nomem_exit:
 856         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 857                         "%s(%s): MEMORY allocation ERROR\n",
 858                         CTCM_FUNTAIL, ch->id);
 859         rc = -ENOMEM;
 860         atomic_dec(&skb->users);
 861         dev_kfree_skb_any(skb);
 862         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 863 done:
 864         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 865         return rc;
 866 }
 867
 868 /**
 869  * Start transmission of a packet.
 870  * Called from generic network device layer.
 871  *
 872  *  skb         Pointer to buffer containing the packet.
 873  *  dev         Pointer to interface struct.
 874  *
 875  * returns 0 if packet consumed, !0 if packet rejected.
 876  *         Note: If we return !0, then the packet is free'd by
 877  *               the generic network layer.
 878  */
 879 /* first merge version - leaving both functions separated */
 880 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 881 {
 882         struct ctcm_priv *priv = dev->ml_priv;
 883
 884         if (skb == NULL) {
 885                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 886                                 "%s(%s): NULL sk_buff passed",
 887                                         CTCM_FUNTAIL, dev->name);
 888                 priv->stats.tx_dropped++;
 889                 return NETDEV_TX_OK;
 890         }
 891         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 892                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 893                         "%s(%s): Got sk_buff with head room < %ld bytes",
 894                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 895                 dev_kfree_skb(skb);
 896                 priv->stats.tx_dropped++;
 897                 return NETDEV_TX_OK;
 898         }
 899
 900         /*
 901          * If channels are not running, try to restart them
 902          * and throw away packet.
 903          */
 904         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 905                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 906                 dev_kfree_skb(skb);
 907                 priv->stats.tx_dropped++;
 908                 priv->stats.tx_errors++;
 909                 priv->stats.tx_carrier_errors++;
 910                 return NETDEV_TX_OK;
 911         }
 912
 913         if (ctcm_test_and_set_busy(dev))
 914                 return NETDEV_TX_BUSY;
 915
 916         dev->trans_start = jiffies;
 917         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 918                 return NETDEV_TX_BUSY;
 919         return NETDEV_TX_OK;
 920 }
 921
 922 /* unmerged MPC variant of ctcm_tx */
 923 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 924 {
 925         int len = 0;
 926         struct ctcm_priv *priv = dev->ml_priv;
 927         struct mpc_group *grp  = priv->mpcg;
 928         struct sk_buff *newskb = NULL;
 929
 930         /*
 931          * Some sanity checks ...
 932          */
 933         if (skb == NULL) {
 934                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 935                         "%s(%s): NULL sk_buff passed",
 936                                         CTCM_FUNTAIL, dev->name);
 937                 priv->stats.tx_dropped++;
 938                                         goto done;
 939         }
 940         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 941                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 942                         "%s(%s): Got sk_buff with head room < %ld bytes",
 943                         CTCM_FUNTAIL, dev->name,
 944                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 945
 946                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 947
 948                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 949                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 950
 951                 if (!newskb) {
 952                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 953                                 "%s: %s: __dev_alloc_skb failed",
 954                                                 __func__, dev->name);
 955
 956                         dev_kfree_skb_any(skb);
 957                         priv->stats.tx_dropped++;
 958                         priv->stats.tx_errors++;
 959                         priv->stats.tx_carrier_errors++;
 960                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 961                                         goto done;
 962                 }
 963                 newskb->protocol = skb->protocol;
 964                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 965                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 966                 dev_kfree_skb_any(skb);
 967                 skb = newskb;
 968         }
 969
 970         /*
 971          * If channels are not running,
 972          * notify anybody about a link failure and throw
 973          * away packet.
 974          */
 975         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 976            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 977                 dev_kfree_skb_any(skb);
 978                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 979                         "%s(%s): inactive MPCGROUP - dropped",
 980                                         CTCM_FUNTAIL, dev->name);
 981                 priv->stats.tx_dropped++;
 982                 priv->stats.tx_errors++;
 983                 priv->stats.tx_carrier_errors++;
 984                                         goto done;
 985         }
 986
 987         if (ctcm_test_and_set_busy(dev)) {
 988                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 989                         "%s(%s): device busy - dropped",
 990                                         CTCM_FUNTAIL, dev->name);
 991                 dev_kfree_skb_any(skb);
 992                 priv->stats.tx_dropped++;
 993                 priv->stats.tx_errors++;
 994                 priv->stats.tx_carrier_errors++;
 995                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 996                                         goto done;
 997         }
 998
 999         dev->trans_start = jiffies;
1000         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
1001                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1002                         "%s(%s): device error - dropped",
1003                                         CTCM_FUNTAIL, dev->name);
1004                 dev_kfree_skb_any(skb);
1005                 priv->stats.tx_dropped++;
1006                 priv->stats.tx_errors++;
1007                 priv->stats.tx_carrier_errors++;
1008                 ctcm_clear_busy(dev);
1009                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1010                                         goto done;
1011         }
1012         ctcm_clear_busy(dev);
1013 done:
1014         if (do_debug)
1015                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1016
1017         return NETDEV_TX_OK;    /* handle freeing of skb here */
1018 }
1019
1020
1021 /**
1022  * Sets MTU of an interface.
1023  *
1024  *  dev         Pointer to interface struct.
1025  *  new_mtu     The new MTU to use for this interface.
1026  *
1027  * returns 0 on success, -EINVAL if MTU is out of valid range.
1028  *         (valid range is 576 .. 65527). If VM is on the
1029  *         remote side, maximum MTU is 32760, however this is
1030  *         not checked here.
1031  */
1032 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1033 {
1034         struct ctcm_priv *priv;
1035         int max_bufsize;
1036
1037         if (new_mtu < 576 || new_mtu > 65527)
1038                 return -EINVAL;
1039
1040         priv = dev->ml_priv;
1041         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1042
1043         if (IS_MPC(priv)) {
1044                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1045                         return -EINVAL;
1046                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1047         } else {
1048                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1049                         return -EINVAL;
1050                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1051         }
1052         dev->mtu = new_mtu;
1053         return 0;
1054 }
1055
1056 /**
1057  * Returns interface statistics of a device.
1058  *
1059  *  dev         Pointer to interface struct.
1060  *
1061  * returns Pointer to stats struct of this interface.
1062  */
1063 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1064 {
1065         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1066 }
1067
1068 static void ctcm_free_netdevice(struct net_device *dev)
1069 {
1070         struct ctcm_priv *priv;
1071         struct mpc_group *grp;
1072
1073         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1074                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1075         priv = dev->ml_priv;
1076         if (priv) {
1077                 grp = priv->mpcg;
1078                 if (grp) {
1079                         if (grp->fsm)
1080                                 kfree_fsm(grp->fsm);
1081                         if (grp->xid_skb)
1082                                 dev_kfree_skb(grp->xid_skb);
1083                         if (grp->rcvd_xid_skb)
1084                                 dev_kfree_skb(grp->rcvd_xid_skb);
1085                         tasklet_kill(&grp->mpc_tasklet2);
1086                         kfree(grp);
1087                         priv->mpcg = NULL;
1088                 }
1089                 if (priv->fsm) {
1090                         kfree_fsm(priv->fsm);
1091                         priv->fsm = NULL;
1092                 }
1093                 kfree(priv->xid);
1094                 priv->xid = NULL;
1095         /*
1096          * Note: kfree(priv); is done in "opposite" function of
1097          * allocator function probe_device which is remove_device.
1098          */
1099         }
1100 #ifdef MODULE
1101         free_netdev(dev);
1102 #endif
1103 }
1104
1105 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1106
1107 static const struct net_device_ops ctcm_netdev_ops = {
1108         .ndo_open               = ctcm_open,
1109         .ndo_stop               = ctcm_close,
1110         .ndo_get_stats          = ctcm_stats,
1111         .ndo_change_mtu         = ctcm_change_mtu,
1112         .ndo_start_xmit         = ctcm_tx,
1113 };
1114
1115 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1116         .ndo_open               = ctcm_open,
1117         .ndo_stop               = ctcm_close,
1118         .ndo_get_stats          = ctcm_stats,
1119         .ndo_change_mtu         = ctcm_change_mtu,
1120         .ndo_start_xmit         = ctcmpc_tx,
1121 };
1122
1123 void static ctcm_dev_setup(struct net_device *dev)
1124 {
1125         dev->type = ARPHRD_SLIP;
1126         dev->tx_queue_len = 100;
1127         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1128 }
1129
1130 /*
1131  * Initialize everything of the net device except the name and the
1132  * channel structs.
1133  */
1134 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1135 {
1136         struct net_device *dev;
1137         struct mpc_group *grp;
1138         if (!priv)
1139                 return NULL;
1140
1141         if (IS_MPC(priv))
1142                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1143         else
1144                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1145
1146         if (!dev) {
1147                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1148                         "%s: MEMORY allocation ERROR",
1149                         CTCM_FUNTAIL);
1150                 return NULL;
1151         }
1152         dev->ml_priv = priv;
1153         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1154                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1155                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1156         if (priv->fsm == NULL) {
1157                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1158                 free_netdev(dev);
1159                 return NULL;
1160         }
1161         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1162         fsm_settimer(priv->fsm, &priv->restart_timer);
1163
1164         if (IS_MPC(priv)) {
1165                 /*  MPC Group Initializations  */
1166                 grp = ctcmpc_init_mpc_group(priv);
1167                 if (grp == NULL) {
1168                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1169                         free_netdev(dev);
1170                         return NULL;
1171                 }
1172                 tasklet_init(&grp->mpc_tasklet2,
1173                                 mpc_group_ready, (unsigned long)dev);
1174                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1175                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1176
1177                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1178                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1179                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1180         } else {
1181                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1182                 dev->netdev_ops = &ctcm_netdev_ops;
1183                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1184         }
1185
1186         CTCMY_DBF_DEV(SETUP, dev, "finished");
1187
1188         return dev;
1189 }
1190
1191 /**
1192  * Main IRQ handler.
1193  *
1194  *  cdev        The ccw_device the interrupt is for.
1195  *  intparm     interruption parameter.
1196  *  irb         interruption response block.
1197  */
1198 static void ctcm_irq_handler(struct ccw_device *cdev,
1199                                 unsigned long intparm, struct irb *irb)
1200 {
1201         struct channel          *ch;
1202         struct net_device       *dev;
1203         struct ctcm_priv        *priv;
1204         struct ccwgroup_device  *cgdev;
1205         int cstat;
1206         int dstat;
1207
1208         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1209                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1210
1211         if (ctcm_check_irb_error(cdev, irb))
1212                 return;
1213
1214         cgdev = dev_get_drvdata(&cdev->dev);
1215
1216         cstat = irb->scsw.cmd.cstat;
1217         dstat = irb->scsw.cmd.dstat;
1218
1219         /* Check for unsolicited interrupts. */
1220         if (cgdev == NULL) {
1221                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1222                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1223                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1224                 dev_warn(&cdev->dev,
1225                         "The adapter received a non-specific IRQ\n");
1226                 return;
1227         }
1228
1229         priv = dev_get_drvdata(&cgdev->dev);
1230
1231         /* Try to extract channel from driver data. */
1232         if (priv->channel[CTCM_READ]->cdev == cdev)
1233                 ch = priv->channel[CTCM_READ];
1234         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1235                 ch = priv->channel[CTCM_WRITE];
1236         else {
1237                 dev_err(&cdev->dev,
1238                         "%s: Internal error: Can't determine channel for "
1239                         "interrupt device %s\n",
1240                         __func__, dev_name(&cdev->dev));
1241                         /* Explain: inconsistent internal structures */
1242                 return;
1243         }
1244
1245         dev = ch->netdev;
1246         if (dev == NULL) {
1247                 dev_err(&cdev->dev,
1248                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1249                         __func__, ch);
1250                         /* Explain: inconsistent internal structures */
1251                 return;
1252         }
1253
1254         /* Copy interruption response block. */
1255         memcpy(ch->irb, irb, sizeof(struct irb));
1256
1257         /* Issue error message and return on subchannel error code */
1258         if (irb->scsw.cmd.cstat) {
1259                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1260                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1261                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1262                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1263                 dev_warn(&cdev->dev,
1264                                 "A check occurred on the subchannel\n");
1265                 return;
1266         }
1267
1268         /* Check the reason-code of a unit check */
1269         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1270                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1271                         /* print it only once */
1272                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1273                                 "%s(%s): sense=%02x, ds=%02x",
1274                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1275                 ccw_unit_check(ch, irb->ecw[0]);
1276                 return;
1277         }
1278         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1279                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1280                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1281                 else
1282                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1283                 return;
1284         }
1285         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1286                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1287                 return;
1288         }
1289         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1290             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1291             (irb->scsw.cmd.stctl ==
1292              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1293                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1294         else
1295                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1296
1297 }
1298
1299 static const struct device_type ctcm_devtype = {
1300         .name = "ctcm",
1301         .groups = ctcm_attr_groups,
1302 };
1303
1304 /**
1305  * Add ctcm specific attributes.
1306  * Add ctcm private data.
1307  *
1308  *  cgdev       pointer to ccwgroup_device just added
1309  *
1310  * returns 0 on success, !0 on failure.
1311  */
1312 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1313 {
1314         struct ctcm_priv *priv;
1315
1316         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1317                         "%s %p",
1318                         __func__, cgdev);
1319
1320         if (!get_device(&cgdev->dev))
1321                 return -ENODEV;
1322
1323         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1324         if (!priv) {
1325                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1326                         "%s: memory allocation failure",
1327                         CTCM_FUNTAIL);
1328                 put_device(&cgdev->dev);
1329                 return -ENOMEM;
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         cgdev->dev.type = &ctcm_devtype;
1336
1337         return 0;
1338 }
1339
1340 /**
1341  * Add a new channel to the list of channels.
1342  * Keeps the channel list sorted.
1343  *
1344  *  cdev        The ccw_device to be added.
1345  *  type        The type class of the new channel.
1346  *  priv        Points to the private data of the ccwgroup_device.
1347  *
1348  * returns 0 on success, !0 on error.
1349  */
1350 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1351                                 struct ctcm_priv *priv)
1352 {
1353         struct channel **c = &channels;
1354         struct channel *ch;
1355         int ccw_num;
1356         int rc = 0;
1357
1358         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1359                 "%s(%s), type %d, proto %d",
1360                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1361
1362         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1363         if (ch == NULL)
1364                 return -ENOMEM;
1365
1366         ch->protocol = priv->protocol;
1367         if (IS_MPC(priv)) {
1368                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1369                 if (ch->discontact_th == NULL)
1370                                         goto nomem_return;
1371
1372                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1373                 tasklet_init(&ch->ch_disc_tasklet,
1374                         mpc_action_send_discontact, (unsigned long)ch);
1375
1376                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1377                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1378                 ccw_num = 17;
1379         } else
1380                 ccw_num = 8;
1381
1382         ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1383         if (ch->ccw == NULL)
1384                                         goto nomem_return;
1385
1386         ch->cdev = cdev;
1387         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1388         ch->type = type;
1389
1390         /**
1391          * "static" ccws are used in the following way:
1392          *
1393          * ccw[0..2] (Channel program for generic I/O):
1394          *           0: prepare
1395          *           1: read or write (depending on direction) with fixed
1396          *              buffer (idal allocated once when buffer is allocated)
1397          *           2: nop
1398          * ccw[3..5] (Channel program for direct write of packets)
1399          *           3: prepare
1400          *           4: write (idal allocated on every write).
1401          *           5: nop
1402          * ccw[6..7] (Channel program for initial channel setup):
1403          *           6: set extended mode
1404          *           7: nop
1405          *
1406          * ch->ccw[0..5] are initialized in ch_action_start because
1407          * the channel's direction is yet unknown here.
1408          *
1409          * ccws used for xid2 negotiations
1410          *  ch-ccw[8-14] need to be used for the XID exchange either
1411          *    X side XID2 Processing
1412          *       8:  write control
1413          *       9:  write th
1414          *           10: write XID
1415          *           11: read th from secondary
1416          *           12: read XID   from secondary
1417          *           13: read 4 byte ID
1418          *           14: nop
1419          *    Y side XID Processing
1420          *           8:  sense
1421          *       9:  read th
1422          *           10: read XID
1423          *           11: write th
1424          *           12: write XID
1425          *           13: write 4 byte ID
1426          *           14: nop
1427          *
1428          *  ccws used for double noop due to VM timing issues
1429          *  which result in unrecoverable Busy on channel
1430          *       15: nop
1431          *       16: nop
1432          */
1433         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1434         ch->ccw[6].flags        = CCW_FLAG_SLI;
1435
1436         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1437         ch->ccw[7].flags        = CCW_FLAG_SLI;
1438
1439         if (IS_MPC(priv)) {
1440                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1441                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1442                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1443                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1444
1445                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1446                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1447
1448                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1449                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1450                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1451                                 mpc_ch_fsm_len, GFP_KERNEL);
1452         } else {
1453                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1454                                 ctc_ch_event_names, CTC_NR_STATES,
1455                                 CTC_NR_EVENTS, ch_fsm,
1456                                 ch_fsm_len, GFP_KERNEL);
1457         }
1458         if (ch->fsm == NULL)
1459                                 goto free_return;
1460
1461         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1462
1463         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1464         if (ch->irb == NULL)
1465                                 goto nomem_return;
1466
1467         while (*c && ctcm_less_than((*c)->id, ch->id))
1468                 c = &(*c)->next;
1469
1470         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1471                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1472                                 "%s (%s) already in list, using old entry",
1473                                 __func__, (*c)->id);
1474
1475                                 goto free_return;
1476         }
1477
1478         spin_lock_init(&ch->collect_lock);
1479
1480         fsm_settimer(ch->fsm, &ch->timer);
1481         skb_queue_head_init(&ch->io_queue);
1482         skb_queue_head_init(&ch->collect_queue);
1483
1484         if (IS_MPC(priv)) {
1485                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1486                 skb_queue_head_init(&ch->sweep_queue);
1487         }
1488         ch->next = *c;
1489         *c = ch;
1490         return 0;
1491
1492 nomem_return:
1493         rc = -ENOMEM;
1494
1495 free_return:    /* note that all channel pointers are 0 or valid */
1496         kfree(ch->ccw);
1497         kfree(ch->discontact_th);
1498         kfree_fsm(ch->fsm);
1499         kfree(ch->irb);
1500         kfree(ch);
1501         return rc;
1502 }
1503
1504 /*
1505  * Return type of a detected device.
1506  */
1507 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1508 {
1509         enum ctcm_channel_types type;
1510         type = (enum ctcm_channel_types)id->driver_info;
1511
1512         if (type == ctcm_channel_type_ficon)
1513                 type = ctcm_channel_type_escon;
1514
1515         return type;
1516 }
1517
1518 /**
1519  *
1520  * Setup an interface.
1521  *
1522  *  cgdev       Device to be setup.
1523  *
1524  * returns 0 on success, !0 on failure.
1525  */
1526 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1527 {
1528         char read_id[CTCM_ID_SIZE];
1529         char write_id[CTCM_ID_SIZE];
1530         int direction;
1531         enum ctcm_channel_types type;
1532         struct ctcm_priv *priv;
1533         struct net_device *dev;
1534         struct ccw_device *cdev0;
1535         struct ccw_device *cdev1;
1536         struct channel *readc;
1537         struct channel *writec;
1538         int ret;
1539         int result;
1540
1541         priv = dev_get_drvdata(&cgdev->dev);
1542         if (!priv) {
1543                 result = -ENODEV;
1544                 goto out_err_result;
1545         }
1546
1547         cdev0 = cgdev->cdev[0];
1548         cdev1 = cgdev->cdev[1];
1549
1550         type = get_channel_type(&cdev0->id);
1551
1552         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1553         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1554
1555         ret = add_channel(cdev0, type, priv);
1556         if (ret) {
1557                 result = ret;
1558                 goto out_err_result;
1559         }
1560         ret = add_channel(cdev1, type, priv);
1561         if (ret) {
1562                 result = ret;
1563                 goto out_remove_channel1;
1564         }
1565
1566         ret = ccw_device_set_online(cdev0);
1567         if (ret != 0) {
1568                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1569                         "%s(%s) set_online rc=%d",
1570                                 CTCM_FUNTAIL, read_id, ret);
1571                 result = -EIO;
1572                 goto out_remove_channel2;
1573         }
1574
1575         ret = ccw_device_set_online(cdev1);
1576         if (ret != 0) {
1577                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1578                         "%s(%s) set_online rc=%d",
1579                                 CTCM_FUNTAIL, write_id, ret);
1580
1581                 result = -EIO;
1582                 goto out_ccw1;
1583         }
1584
1585         dev = ctcm_init_netdevice(priv);
1586         if (dev == NULL) {
1587                 result = -ENODEV;
1588                 goto out_ccw2;
1589         }
1590
1591         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1592                 priv->channel[direction] =
1593                         channel_get(type, direction == CTCM_READ ?
1594                                 read_id : write_id, direction);
1595                 if (priv->channel[direction] == NULL) {
1596                         if (direction == CTCM_WRITE)
1597                                 channel_free(priv->channel[CTCM_READ]);
1598                         goto out_dev;
1599                 }
1600                 priv->channel[direction]->netdev = dev;
1601                 priv->channel[direction]->protocol = priv->protocol;
1602                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1603         }
1604         /* sysfs magic */
1605         SET_NETDEV_DEV(dev, &cgdev->dev);
1606
1607         if (register_netdev(dev)) {
1608                 result = -ENODEV;
1609                 goto out_dev;
1610         }
1611
1612         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1613
1614         dev_info(&dev->dev,
1615                 "setup OK : r/w = %s/%s, protocol : %d\n",
1616                         priv->channel[CTCM_READ]->id,
1617                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1618
1619         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1620                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1621                         priv->channel[CTCM_READ]->id,
1622                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1623
1624         return 0;
1625 out_dev:
1626         ctcm_free_netdevice(dev);
1627 out_ccw2:
1628         ccw_device_set_offline(cgdev->cdev[1]);
1629 out_ccw1:
1630         ccw_device_set_offline(cgdev->cdev[0]);
1631 out_remove_channel2:
1632         readc = channel_get(type, read_id, CTCM_READ);
1633         channel_remove(readc);
1634 out_remove_channel1:
1635         writec = channel_get(type, write_id, CTCM_WRITE);
1636         channel_remove(writec);
1637 out_err_result:
1638         return result;
1639 }
1640
1641 /**
1642  * Shutdown an interface.
1643  *
1644  *  cgdev       Device to be shut down.
1645  *
1646  * returns 0 on success, !0 on failure.
1647  */
1648 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1649 {
1650         struct ctcm_priv *priv;
1651         struct net_device *dev;
1652
1653         priv = dev_get_drvdata(&cgdev->dev);
1654         if (!priv)
1655                 return -ENODEV;
1656
1657         if (priv->channel[CTCM_READ]) {
1658                 dev = priv->channel[CTCM_READ]->netdev;
1659                 CTCM_DBF_DEV(SETUP, dev, "");
1660                 /* Close the device */
1661                 ctcm_close(dev);
1662                 dev->flags &= ~IFF_RUNNING;
1663                 channel_free(priv->channel[CTCM_READ]);
1664         } else
1665                 dev = NULL;
1666
1667         if (priv->channel[CTCM_WRITE])
1668                 channel_free(priv->channel[CTCM_WRITE]);
1669
1670         if (dev) {
1671                 unregister_netdev(dev);
1672                 ctcm_free_netdevice(dev);
1673         }
1674
1675         if (priv->fsm)
1676                 kfree_fsm(priv->fsm);
1677
1678         ccw_device_set_offline(cgdev->cdev[1]);
1679         ccw_device_set_offline(cgdev->cdev[0]);
1680
1681         if (priv->channel[CTCM_READ])
1682                 channel_remove(priv->channel[CTCM_READ]);
1683         if (priv->channel[CTCM_WRITE])
1684                 channel_remove(priv->channel[CTCM_WRITE]);
1685         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1686
1687         return 0;
1688
1689 }
1690
1691
1692 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1693 {
1694         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1695
1696         BUG_ON(priv == NULL);
1697
1698         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1699                         "removing device %p, proto : %d",
1700                         cgdev, priv->protocol);
1701
1702         if (cgdev->state == CCWGROUP_ONLINE)
1703                 ctcm_shutdown_device(cgdev);
1704         dev_set_drvdata(&cgdev->dev, NULL);
1705         kfree(priv);
1706         put_device(&cgdev->dev);
1707 }
1708
1709 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1710 {
1711         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1712
1713         if (gdev->state == CCWGROUP_OFFLINE)
1714                 return 0;
1715         netif_device_detach(priv->channel[CTCM_READ]->netdev);
1716         ctcm_close(priv->channel[CTCM_READ]->netdev);
1717         if (!wait_event_timeout(priv->fsm->wait_q,
1718             fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1719                 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1720                 return -EBUSY;
1721         }
1722         ccw_device_set_offline(gdev->cdev[1]);
1723         ccw_device_set_offline(gdev->cdev[0]);
1724         return 0;
1725 }
1726
1727 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1728 {
1729         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1730         int rc;
1731
1732         if (gdev->state == CCWGROUP_OFFLINE)
1733                 return 0;
1734         rc = ccw_device_set_online(gdev->cdev[1]);
1735         if (rc)
1736                 goto err_out;
1737         rc = ccw_device_set_online(gdev->cdev[0]);
1738         if (rc)
1739                 goto err_out;
1740         ctcm_open(priv->channel[CTCM_READ]->netdev);
1741 err_out:
1742         netif_device_attach(priv->channel[CTCM_READ]->netdev);
1743         return rc;
1744 }
1745
1746 static struct ccw_device_id ctcm_ids[] = {
1747         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1748         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1749         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1750         {},
1751 };
1752 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1753
1754 static struct ccw_driver ctcm_ccw_driver = {
1755         .driver = {
1756                 .owner  = THIS_MODULE,
1757                 .name   = "ctcm",
1758         },
1759         .ids    = ctcm_ids,
1760         .probe  = ccwgroup_probe_ccwdev,
1761         .remove = ccwgroup_remove_ccwdev,
1762         .int_class = IOINT_CTC,
1763 };
1764
1765 static struct ccwgroup_driver ctcm_group_driver = {
1766         .driver = {
1767                 .owner  = THIS_MODULE,
1768                 .name   = CTC_DRIVER_NAME,
1769         },
1770         .setup       = ctcm_probe_device,
1771         .remove      = ctcm_remove_device,
1772         .set_online  = ctcm_new_device,
1773         .set_offline = ctcm_shutdown_device,
1774         .freeze      = ctcm_pm_suspend,
1775         .thaw        = ctcm_pm_resume,
1776         .restore     = ctcm_pm_resume,
1777 };
1778
1779 static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1780                                        const char *buf, size_t count)
1781 {
1782         int err;
1783
1784         err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1785         return err ? err : count;
1786 }
1787 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1788
1789 static struct attribute *ctcm_drv_attrs[] = {
1790         &driver_attr_group.attr,
1791         NULL,
1792 };
1793 static struct attribute_group ctcm_drv_attr_group = {
1794         .attrs = ctcm_drv_attrs,
1795 };
1796 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1797         &ctcm_drv_attr_group,
1798         NULL,
1799 };
1800
1801 /*
1802  * Module related routines
1803  */
1804
1805 /*
1806  * Prepare to be unloaded. Free IRQ's and release all resources.
1807  * This is called just before this module is unloaded. It is
1808  * not called, if the usage count is !0, so we don't need to check
1809  * for that.
1810  */
1811 static void __exit ctcm_exit(void)
1812 {
1813         ccwgroup_driver_unregister(&ctcm_group_driver);
1814         ccw_driver_unregister(&ctcm_ccw_driver);
1815         root_device_unregister(ctcm_root_dev);
1816         ctcm_unregister_dbf_views();
1817         pr_info("CTCM driver unloaded\n");
1818 }
1819
1820 /*
1821  * Print Banner.
1822  */
1823 static void print_banner(void)
1824 {
1825         pr_info("CTCM driver initialized\n");
1826 }
1827
1828 /**
1829  * Initialize module.
1830  * This is called just after the module is loaded.
1831  *
1832  * returns 0 on success, !0 on error.
1833  */
1834 static int __init ctcm_init(void)
1835 {
1836         int ret;
1837
1838         channels = NULL;
1839
1840         ret = ctcm_register_dbf_views();
1841         if (ret)
1842                 goto out_err;
1843         ctcm_root_dev = root_device_register("ctcm");
1844         ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1845         if (ret)
1846                 goto register_err;
1847         ret = ccw_driver_register(&ctcm_ccw_driver);
1848         if (ret)
1849                 goto ccw_err;
1850         ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1851         ret = ccwgroup_driver_register(&ctcm_group_driver);
1852         if (ret)
1853                 goto ccwgroup_err;
1854         print_banner();
1855         return 0;
1856
1857 ccwgroup_err:
1858         ccw_driver_unregister(&ctcm_ccw_driver);
1859 ccw_err:
1860         root_device_unregister(ctcm_root_dev);
1861 register_err:
1862         ctcm_unregister_dbf_views();
1863 out_err:
1864         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1865                 __func__, ret);
1866         return ret;
1867 }
1868
1869 module_init(ctcm_init);
1870 module_exit(ctcm_exit);
1871
1872 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1873 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1874 MODULE_LICENSE("GPL");
1875