drivers/s390/net/ctcm_main.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright IBM Corp. 2001, 2009
   4  * Author(s):
   5  *      Original CTC driver(s):
   6  *              Fritz Elfert (felfert@millenux.com)
   7  *              Dieter Wellerdiek (wel@de.ibm.com)
   8  *              Martin Schwidefsky (schwidefsky@de.ibm.com)
   9  *              Denis Joseph Barrow (barrow_dj@yahoo.com)
  10  *              Jochen Roehrig (roehrig@de.ibm.com)
  11  *              Cornelia Huck <cornelia.huck@de.ibm.com>
  12  *      MPC additions:
  13  *              Belinda Thompson (belindat@us.ibm.com)
  14  *              Andy Richter (richtera@us.ibm.com)
  15  *      Revived by:
  16  *              Peter Tiedemann (ptiedem@de.ibm.com)
  17  */
  18
  19 #undef DEBUG
  20 #undef DEBUGDATA
  21 #undef DEBUGCCW
  22
  23 #define KMSG_COMPONENT "ctcm"
  24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  25
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/kernel.h>
  29 #include <linux/slab.h>
  30 #include <linux/errno.h>
  31 #include <linux/types.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/timer.h>
  34 #include <linux/bitops.h>
  35
  36 #include <linux/signal.h>
  37 #include <linux/string.h>
  38
  39 #include <linux/ip.h>
  40 #include <linux/if_arp.h>
  41 #include <linux/tcp.h>
  42 #include <linux/skbuff.h>
  43 #include <linux/ctype.h>
  44 #include <net/dst.h>
  45
  46 #include <linux/io.h>
  47 #include <asm/ccwdev.h>
  48 #include <asm/ccwgroup.h>
  49 #include <linux/uaccess.h>
  50
  51 #include <asm/idals.h>
  52
  53 #include "ctcm_fsms.h"
  54 #include "ctcm_main.h"
  55
  56 /* Some common global variables */
  57
  58 /**
  59  * The root device for ctcm group devices
  60  */
  61 static struct device *ctcm_root_dev;
  62
  63 /*
  64  * Linked list of all detected channels.
  65  */
  66 struct channel *channels;
  67
  68 /**
  69  * Unpack a just received skb and hand it over to
  70  * upper layers.
  71  *
  72  *  ch          The channel where this skb has been received.
  73  *  pskb        The received skb.
  74  */
  75 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  76 {
  77         struct net_device *dev = ch->netdev;
  78         struct ctcm_priv *priv = dev->ml_priv;
  79         __u16 len = *((__u16 *) pskb->data);
  80
  81         skb_put(pskb, 2 + LL_HEADER_LENGTH);
  82         skb_pull(pskb, 2);
  83         pskb->dev = dev;
  84         pskb->ip_summed = CHECKSUM_UNNECESSARY;
  85         while (len > 0) {
  86                 struct sk_buff *skb;
  87                 int skblen;
  88                 struct ll_header *header = (struct ll_header *)pskb->data;
  89
  90                 skb_pull(pskb, LL_HEADER_LENGTH);
  91                 if ((ch->protocol == CTCM_PROTO_S390) &&
  92                     (header->type != ETH_P_IP)) {
  93                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  94                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
  95                                 /*
  96                                  * Check packet type only if we stick strictly
  97                                  * to S/390's protocol of OS390. This only
  98                                  * supports IP. Otherwise allow any packet
  99                                  * type.
 100                                  */
 101                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 102                                         "%s(%s): Illegal packet type 0x%04x"
 103                                         " - dropping",
 104                                         CTCM_FUNTAIL, dev->name, header->type);
 105                         }
 106                         priv->stats.rx_dropped++;
 107                         priv->stats.rx_frame_errors++;
 108                         return;
 109                 }
 110                 pskb->protocol = cpu_to_be16(header->type);
 111                 if ((header->length <= LL_HEADER_LENGTH) ||
 112                     (len <= LL_HEADER_LENGTH)) {
 113                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 114                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 115                                         "%s(%s): Illegal packet size %d(%d,%d)"
 116                                         "- dropping",
 117                                         CTCM_FUNTAIL, dev->name,
 118                                         header->length, dev->mtu, len);
 119                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 120                         }
 121
 122                         priv->stats.rx_dropped++;
 123                         priv->stats.rx_length_errors++;
 124                         return;
 125                 }
 126                 header->length -= LL_HEADER_LENGTH;
 127                 len -= LL_HEADER_LENGTH;
 128                 if ((header->length > skb_tailroom(pskb)) ||
 129                     (header->length > len)) {
 130                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 131                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 132                                         "%s(%s): Packet size %d (overrun)"
 133                                         " - dropping", CTCM_FUNTAIL,
 134                                                 dev->name, header->length);
 135                                 ch->logflags |= LOG_FLAG_OVERRUN;
 136                         }
 137
 138                         priv->stats.rx_dropped++;
 139                         priv->stats.rx_length_errors++;
 140                         return;
 141                 }
 142                 skb_put(pskb, header->length);
 143                 skb_reset_mac_header(pskb);
 144                 len -= header->length;
 145                 skb = dev_alloc_skb(pskb->len);
 146                 if (!skb) {
 147                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 148                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 149                                         "%s(%s): MEMORY allocation error",
 150                                                 CTCM_FUNTAIL, dev->name);
 151                                 ch->logflags |= LOG_FLAG_NOMEM;
 152                         }
 153                         priv->stats.rx_dropped++;
 154                         return;
 155                 }
 156                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 157                                           pskb->len);
 158                 skb_reset_mac_header(skb);
 159                 skb->dev = pskb->dev;
 160                 skb->protocol = pskb->protocol;
 161                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
 162                 skblen = skb->len;
 163                 /*
 164                  * reset logflags
 165                  */
 166                 ch->logflags = 0;
 167                 priv->stats.rx_packets++;
 168                 priv->stats.rx_bytes += skblen;
 169                 netif_rx_ni(skb);
 170                 if (len > 0) {
 171                         skb_pull(pskb, header->length);
 172                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 173                                 CTCM_DBF_DEV_NAME(TRACE, dev,
 174                                         "Overrun in ctcm_unpack_skb");
 175                                 ch->logflags |= LOG_FLAG_OVERRUN;
 176                                 return;
 177                         }
 178                         skb_put(pskb, LL_HEADER_LENGTH);
 179                 }
 180         }
 181 }
 182
 183 /**
 184  * Release a specific channel in the channel list.
 185  *
 186  *  ch          Pointer to channel struct to be released.
 187  */
 188 static void channel_free(struct channel *ch)
 189 {
 190         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 191         ch->flags &= ~CHANNEL_FLAGS_INUSE;
 192         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 193 }
 194
 195 /**
 196  * Remove a specific channel in the channel list.
 197  *
 198  *  ch          Pointer to channel struct to be released.
 199  */
 200 static void channel_remove(struct channel *ch)
 201 {
 202         struct channel **c = &channels;
 203         char chid[CTCM_ID_SIZE+1];
 204         int ok = 0;
 205
 206         if (ch == NULL)
 207                 return;
 208         else
 209                 strncpy(chid, ch->id, CTCM_ID_SIZE);
 210
 211         channel_free(ch);
 212         while (*c) {
 213                 if (*c == ch) {
 214                         *c = ch->next;
 215                         fsm_deltimer(&ch->timer);
 216                         if (IS_MPC(ch))
 217                                 fsm_deltimer(&ch->sweep_timer);
 218
 219                         kfree_fsm(ch->fsm);
 220                         clear_normalized_cda(&ch->ccw[4]);
 221                         if (ch->trans_skb != NULL) {
 222                                 clear_normalized_cda(&ch->ccw[1]);
 223                                 dev_kfree_skb_any(ch->trans_skb);
 224                         }
 225                         if (IS_MPC(ch)) {
 226                                 tasklet_kill(&ch->ch_tasklet);
 227                                 tasklet_kill(&ch->ch_disc_tasklet);
 228                                 kfree(ch->discontact_th);
 229                         }
 230                         kfree(ch->ccw);
 231                         kfree(ch->irb);
 232                         kfree(ch);
 233                         ok = 1;
 234                         break;
 235                 }
 236                 c = &((*c)->next);
 237         }
 238
 239         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 240                         chid, ok ? "OK" : "failed");
 241 }
 242
 243 /**
 244  * Get a specific channel from the channel list.
 245  *
 246  *  type        Type of channel we are interested in.
 247  *  id          Id of channel we are interested in.
 248  *  direction   Direction we want to use this channel for.
 249  *
 250  * returns Pointer to a channel or NULL if no matching channel available.
 251  */
 252 static struct channel *channel_get(enum ctcm_channel_types type,
 253                                         char *id, int direction)
 254 {
 255         struct channel *ch = channels;
 256
 257         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 258                 ch = ch->next;
 259         if (!ch) {
 260                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 261                                 "%s(%d, %s, %d) not found in channel list\n",
 262                                 CTCM_FUNTAIL, type, id, direction);
 263         } else {
 264                 if (ch->flags & CHANNEL_FLAGS_INUSE)
 265                         ch = NULL;
 266                 else {
 267                         ch->flags |= CHANNEL_FLAGS_INUSE;
 268                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 269                         ch->flags |= (direction == CTCM_WRITE)
 270                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 271                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 272                 }
 273         }
 274         return ch;
 275 }
 276
 277 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 278 {
 279         if (!IS_ERR(irb))
 280                 return 0;
 281
 282         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 283                         "irb error %ld on device %s\n",
 284                                 PTR_ERR(irb), dev_name(&cdev->dev));
 285
 286         switch (PTR_ERR(irb)) {
 287         case -EIO:
 288                 dev_err(&cdev->dev,
 289                         "An I/O-error occurred on the CTCM device\n");
 290                 break;
 291         case -ETIMEDOUT:
 292                 dev_err(&cdev->dev,
 293                         "An adapter hardware operation timed out\n");
 294                 break;
 295         default:
 296                 dev_err(&cdev->dev,
 297                         "An error occurred on the adapter hardware\n");
 298         }
 299         return PTR_ERR(irb);
 300 }
 301
 302
 303 /**
 304  * Check sense of a unit check.
 305  *
 306  *  ch          The channel, the sense code belongs to.
 307  *  sense       The sense code to inspect.
 308  */
 309 static void ccw_unit_check(struct channel *ch, __u8 sense)
 310 {
 311         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 312                         "%s(%s): %02x",
 313                                 CTCM_FUNTAIL, ch->id, sense);
 314
 315         if (sense & SNS0_INTERVENTION_REQ) {
 316                 if (sense & 0x01) {
 317                         if (ch->sense_rc != 0x01) {
 318                                 pr_notice(
 319                                         "%s: The communication peer has "
 320                                         "disconnected\n", ch->id);
 321                                 ch->sense_rc = 0x01;
 322                         }
 323                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 324                 } else {
 325                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 326                                 pr_notice(
 327                                         "%s: The remote operating system is "
 328                                         "not available\n", ch->id);
 329                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
 330                         }
 331                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 332                 }
 333         } else if (sense & SNS0_EQUIPMENT_CHECK) {
 334                 if (sense & SNS0_BUS_OUT_CHECK) {
 335                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 336                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 337                                         "%s(%s): remote HW error %02x",
 338                                                 CTCM_FUNTAIL, ch->id, sense);
 339                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
 340                         }
 341                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 342                 } else {
 343                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 344                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 345                                         "%s(%s): remote read parity error %02x",
 346                                                 CTCM_FUNTAIL, ch->id, sense);
 347                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 348                         }
 349                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 350                 }
 351         } else if (sense & SNS0_BUS_OUT_CHECK) {
 352                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 353                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 354                                 "%s(%s): BUS OUT error %02x",
 355                                         CTCM_FUNTAIL, ch->id, sense);
 356                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
 357                 }
 358                 if (sense & 0x04)       /* data-streaming timeout */
 359                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 360                 else                    /* Data-transfer parity error */
 361                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 362         } else if (sense & SNS0_CMD_REJECT) {
 363                 if (ch->sense_rc != SNS0_CMD_REJECT) {
 364                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 365                                 "%s(%s): Command rejected",
 366                                                 CTCM_FUNTAIL, ch->id);
 367                         ch->sense_rc = SNS0_CMD_REJECT;
 368                 }
 369         } else if (sense == 0) {
 370                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 371                         "%s(%s): Unit check ZERO",
 372                                         CTCM_FUNTAIL, ch->id);
 373                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 374         } else {
 375                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 376                         "%s(%s): Unit check code %02x unknown",
 377                                         CTCM_FUNTAIL, ch->id, sense);
 378                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 379         }
 380 }
 381
 382 int ctcm_ch_alloc_buffer(struct channel *ch)
 383 {
 384         clear_normalized_cda(&ch->ccw[1]);
 385         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 386         if (ch->trans_skb == NULL) {
 387                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 388                         "%s(%s): %s trans_skb allocation error",
 389                         CTCM_FUNTAIL, ch->id,
 390                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 391                                 "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) == CTCM_READ) ?
 403                                 "RX" : "TX");
 404                 return -ENOMEM;
 405         }
 406
 407         ch->ccw[1].count = 0;
 408         ch->trans_skb_data = ch->trans_skb->data;
 409         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 410         return 0;
 411 }
 412
 413 /*
 414  * Interface API for upper network layers
 415  */
 416
 417 /**
 418  * Open an interface.
 419  * Called from generic network layer when ifconfig up is run.
 420  *
 421  *  dev         Pointer to interface struct.
 422  *
 423  * returns 0 on success, -ERRNO on failure. (Never fails.)
 424  */
 425 int ctcm_open(struct net_device *dev)
 426 {
 427         struct ctcm_priv *priv = dev->ml_priv;
 428
 429         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 430         if (!IS_MPC(priv))
 431                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 432         return 0;
 433 }
 434
 435 /**
 436  * Close an interface.
 437  * Called from generic network layer when ifconfig down is run.
 438  *
 439  *  dev         Pointer to interface struct.
 440  *
 441  * returns 0 on success, -ERRNO on failure. (Never fails.)
 442  */
 443 int ctcm_close(struct net_device *dev)
 444 {
 445         struct ctcm_priv *priv = dev->ml_priv;
 446
 447         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 448         if (!IS_MPC(priv))
 449                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 450         return 0;
 451 }
 452
 453
 454 /**
 455  * Transmit a packet.
 456  * This is a helper function for ctcm_tx().
 457  *
 458  *  ch          Channel to be used for sending.
 459  *  skb         Pointer to struct sk_buff of packet to send.
 460  *            The linklevel header has already been set up
 461  *            by ctcm_tx().
 462  *
 463  * returns 0 on success, -ERRNO on failure. (Never fails.)
 464  */
 465 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 466 {
 467         unsigned long saveflags;
 468         struct ll_header header;
 469         int rc = 0;
 470         __u16 block_len;
 471         int ccw_idx;
 472         struct sk_buff *nskb;
 473         unsigned long hi;
 474
 475         /* we need to acquire the lock for testing the state
 476          * otherwise we can have an IRQ changing the state to
 477          * TXIDLE after the test but before acquiring the lock.
 478          */
 479         spin_lock_irqsave(&ch->collect_lock, saveflags);
 480         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 481                 int l = skb->len + LL_HEADER_LENGTH;
 482
 483                 if (ch->collect_len + l > ch->max_bufsize - 2) {
 484                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 485                         return -EBUSY;
 486                 } else {
 487                         refcount_inc(&skb->users);
 488                         header.length = l;
 489                         header.type = be16_to_cpu(skb->protocol);
 490                         header.unused = 0;
 491                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 492                                LL_HEADER_LENGTH);
 493                         skb_queue_tail(&ch->collect_queue, skb);
 494                         ch->collect_len += l;
 495                 }
 496                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 497                                 goto done;
 498         }
 499         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 500         /*
 501          * Protect skb against beeing free'd by upper
 502          * layers.
 503          */
 504         refcount_inc(&skb->users);
 505         ch->prof.txlen += skb->len;
 506         header.length = skb->len + LL_HEADER_LENGTH;
 507         header.type = be16_to_cpu(skb->protocol);
 508         header.unused = 0;
 509         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 510         block_len = skb->len + 2;
 511         *((__u16 *)skb_push(skb, 2)) = block_len;
 512
 513         /*
 514          * IDAL support in CTCM is broken, so we have to
 515          * care about skb's above 2G ourselves.
 516          */
 517         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 518         if (hi) {
 519                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 520                 if (!nskb) {
 521                         refcount_dec(&skb->users);
 522                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 523                         ctcm_clear_busy(ch->netdev);
 524                         return -ENOMEM;
 525                 } else {
 526                         skb_put_data(nskb, skb->data, skb->len);
 527                         refcount_inc(&nskb->users);
 528                         refcount_dec(&skb->users);
 529                         dev_kfree_skb_irq(skb);
 530                         skb = nskb;
 531                 }
 532         }
 533
 534         ch->ccw[4].count = block_len;
 535         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 536                 /*
 537                  * idal allocation failed, try via copying to
 538                  * trans_skb. trans_skb usually has a pre-allocated
 539                  * idal.
 540                  */
 541                 if (ctcm_checkalloc_buffer(ch)) {
 542                         /*
 543                          * Remove our header. It gets added
 544                          * again on retransmit.
 545                          */
 546                         refcount_dec(&skb->users);
 547                         skb_pull(skb, LL_HEADER_LENGTH + 2);
 548                         ctcm_clear_busy(ch->netdev);
 549                         return -ENOMEM;
 550                 }
 551
 552                 skb_reset_tail_pointer(ch->trans_skb);
 553                 ch->trans_skb->len = 0;
 554                 ch->ccw[1].count = skb->len;
 555                 skb_copy_from_linear_data(skb,
 556                                 skb_put(ch->trans_skb, skb->len), skb->len);
 557                 refcount_dec(&skb->users);
 558                 dev_kfree_skb_irq(skb);
 559                 ccw_idx = 0;
 560         } else {
 561                 skb_queue_tail(&ch->io_queue, skb);
 562                 ccw_idx = 3;
 563         }
 564         if (do_debug_ccw)
 565                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 566                                         sizeof(struct ccw1) * 3);
 567         ch->retry = 0;
 568         fsm_newstate(ch->fsm, CTC_STATE_TX);
 569         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 570         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 571         ch->prof.send_stamp = jiffies;
 572         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
 573         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 574         if (ccw_idx == 3)
 575                 ch->prof.doios_single++;
 576         if (rc != 0) {
 577                 fsm_deltimer(&ch->timer);
 578                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
 579                 if (ccw_idx == 3)
 580                         skb_dequeue_tail(&ch->io_queue);
 581                 /*
 582                  * Remove our header. It gets added
 583                  * again on retransmit.
 584                  */
 585                 skb_pull(skb, LL_HEADER_LENGTH + 2);
 586         } else if (ccw_idx == 0) {
 587                 struct net_device *dev = ch->netdev;
 588                 struct ctcm_priv *priv = dev->ml_priv;
 589                 priv->stats.tx_packets++;
 590                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 591         }
 592 done:
 593         ctcm_clear_busy(ch->netdev);
 594         return rc;
 595 }
 596
 597 static void ctcmpc_send_sweep_req(struct channel *rch)
 598 {
 599         struct net_device *dev = rch->netdev;
 600         struct ctcm_priv *priv;
 601         struct mpc_group *grp;
 602         struct th_sweep *header;
 603         struct sk_buff *sweep_skb;
 604         struct channel *ch;
 605         /* int rc = 0; */
 606
 607         priv = dev->ml_priv;
 608         grp = priv->mpcg;
 609         ch = priv->channel[CTCM_WRITE];
 610
 611         /* sweep processing is not complete until response and request */
 612         /* has completed for all read channels in group                */
 613         if (grp->in_sweep == 0) {
 614                 grp->in_sweep = 1;
 615                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 616                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 617         }
 618
 619         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 620
 621         if (sweep_skb == NULL)  {
 622                 /* rc = -ENOMEM; */
 623                                 goto nomem;
 624         }
 625
 626         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 627
 628         if (!header) {
 629                 dev_kfree_skb_any(sweep_skb);
 630                 /* rc = -ENOMEM; */
 631                                 goto nomem;
 632         }
 633
 634         header->th.th_seg       = 0x00 ;
 635         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 636         header->th.th_blk_flag  = 0x00;
 637         header->th.th_is_xid    = 0x00;
 638         header->th.th_seq_num   = 0x00;
 639         header->sw.th_last_seq  = ch->th_seq_num;
 640
 641         skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
 642
 643         kfree(header);
 644
 645         netif_trans_update(dev);
 646         skb_queue_tail(&ch->sweep_queue, sweep_skb);
 647
 648         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 649
 650         return;
 651
 652 nomem:
 653         grp->in_sweep = 0;
 654         ctcm_clear_busy(dev);
 655         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 656
 657         return;
 658 }
 659
 660 /*
 661  * MPC mode version of transmit_skb
 662  */
 663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 664 {
 665         struct pdu *p_header;
 666         struct net_device *dev = ch->netdev;
 667         struct ctcm_priv *priv = dev->ml_priv;
 668         struct mpc_group *grp = priv->mpcg;
 669         struct th_header *header;
 670         struct sk_buff *nskb;
 671         int rc = 0;
 672         int ccw_idx;
 673         unsigned long hi;
 674         unsigned long saveflags = 0;    /* avoids compiler warning */
 675
 676         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 677                         __func__, dev->name, smp_processor_id(), ch,
 678                                         ch->id, fsm_getstate_str(ch->fsm));
 679
 680         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 681                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 682                 refcount_inc(&skb->users);
 683                 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 684
 685                 if (!p_header) {
 686                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 687                                 goto nomem_exit;
 688                 }
 689
 690                 p_header->pdu_offset = skb->len;
 691                 p_header->pdu_proto = 0x01;
 692                 p_header->pdu_flag = 0x00;
 693                 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 694                         p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 695                 } else {
 696                         p_header->pdu_flag |= PDU_FIRST;
 697                 }
 698                 p_header->pdu_seq = 0;
 699                 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 700                        PDU_HEADER_LENGTH);
 701
 702                 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 703                                 "pdu header and data for up to 32 bytes:\n",
 704                                 __func__, dev->name, skb->len);
 705                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 706
 707                 skb_queue_tail(&ch->collect_queue, skb);
 708                 ch->collect_len += skb->len;
 709                 kfree(p_header);
 710
 711                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 712                         goto done;
 713         }
 714
 715         /*
 716          * Protect skb against beeing free'd by upper
 717          * layers.
 718          */
 719         refcount_inc(&skb->users);
 720
 721         /*
 722          * IDAL support in CTCM is broken, so we have to
 723          * care about skb's above 2G ourselves.
 724          */
 725         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 726         if (hi) {
 727                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 728                 if (!nskb) {
 729                         goto nomem_exit;
 730                 } else {
 731                         skb_put_data(nskb, skb->data, skb->len);
 732                         refcount_inc(&nskb->users);
 733                         refcount_dec(&skb->users);
 734                         dev_kfree_skb_irq(skb);
 735                         skb = nskb;
 736                 }
 737         }
 738
 739         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 740
 741         if (!p_header)
 742                 goto nomem_exit;
 743
 744         p_header->pdu_offset = skb->len;
 745         p_header->pdu_proto = 0x01;
 746         p_header->pdu_flag = 0x00;
 747         p_header->pdu_seq = 0;
 748         if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
 749                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 750         } else {
 751                 p_header->pdu_flag |= PDU_FIRST;
 752         }
 753         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 754
 755         kfree(p_header);
 756
 757         if (ch->collect_len > 0) {
 758                 spin_lock_irqsave(&ch->collect_lock, saveflags);
 759                 skb_queue_tail(&ch->collect_queue, skb);
 760                 ch->collect_len += skb->len;
 761                 skb = skb_dequeue(&ch->collect_queue);
 762                 ch->collect_len -= skb->len;
 763                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 764         }
 765
 766         p_header = (struct pdu *)skb->data;
 767         p_header->pdu_flag |= PDU_LAST;
 768
 769         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 770
 771         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 772         if (!header)
 773                 goto nomem_exit;
 774
 775         header->th_seg = 0x00;
 776         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 777         header->th_blk_flag = 0x00;
 778         header->th_is_xid = 0x00;          /* Just data here */
 779         ch->th_seq_num++;
 780         header->th_seq_num = ch->th_seq_num;
 781
 782         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 783                        __func__, dev->name, ch->th_seq_num);
 784
 785         /* put the TH on the packet */
 786         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 787
 788         kfree(header);
 789
 790         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 791                         "up to 32 bytes sent to vtam:\n",
 792                                 __func__, dev->name, skb->len);
 793         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 794
 795         ch->ccw[4].count = skb->len;
 796         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 797                 /*
 798                  * idal allocation failed, try via copying to trans_skb.
 799                  * trans_skb usually has a pre-allocated idal.
 800                  */
 801                 if (ctcm_checkalloc_buffer(ch)) {
 802                         /*
 803                          * Remove our header.
 804                          * It gets added again on retransmit.
 805                          */
 806                                 goto nomem_exit;
 807                 }
 808
 809                 skb_reset_tail_pointer(ch->trans_skb);
 810                 ch->trans_skb->len = 0;
 811                 ch->ccw[1].count = skb->len;
 812                 skb_put_data(ch->trans_skb, skb->data, skb->len);
 813                 refcount_dec(&skb->users);
 814                 dev_kfree_skb_irq(skb);
 815                 ccw_idx = 0;
 816                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 817                                 "up to 32 bytes sent to vtam:\n",
 818                                 __func__, dev->name, ch->trans_skb->len);
 819                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
 820                                 min_t(int, 32, ch->trans_skb->len));
 821         } else {
 822                 skb_queue_tail(&ch->io_queue, skb);
 823                 ccw_idx = 3;
 824         }
 825         ch->retry = 0;
 826         fsm_newstate(ch->fsm, CTC_STATE_TX);
 827         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 828
 829         if (do_debug_ccw)
 830                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 831                                         sizeof(struct ccw1) * 3);
 832
 833         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 834         ch->prof.send_stamp = jiffies;
 835         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 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         refcount_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 /* first merge version - leaving both functions separated */
 870 static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 871 {
 872         struct ctcm_priv *priv = dev->ml_priv;
 873
 874         if (skb == NULL) {
 875                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 876                                 "%s(%s): NULL sk_buff passed",
 877                                         CTCM_FUNTAIL, dev->name);
 878                 priv->stats.tx_dropped++;
 879                 return NETDEV_TX_OK;
 880         }
 881         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 882                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 883                         "%s(%s): Got sk_buff with head room < %ld bytes",
 884                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 885                 dev_kfree_skb(skb);
 886                 priv->stats.tx_dropped++;
 887                 return NETDEV_TX_OK;
 888         }
 889
 890         /*
 891          * If channels are not running, try to restart them
 892          * and throw away packet.
 893          */
 894         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 895                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
 896                 dev_kfree_skb(skb);
 897                 priv->stats.tx_dropped++;
 898                 priv->stats.tx_errors++;
 899                 priv->stats.tx_carrier_errors++;
 900                 return NETDEV_TX_OK;
 901         }
 902
 903         if (ctcm_test_and_set_busy(dev))
 904                 return NETDEV_TX_BUSY;
 905
 906         netif_trans_update(dev);
 907         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 908                 return NETDEV_TX_BUSY;
 909         return NETDEV_TX_OK;
 910 }
 911
 912 /* unmerged MPC variant of ctcm_tx */
 913 static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 914 {
 915         int len = 0;
 916         struct ctcm_priv *priv = dev->ml_priv;
 917         struct mpc_group *grp  = priv->mpcg;
 918         struct sk_buff *newskb = NULL;
 919
 920         /*
 921          * Some sanity checks ...
 922          */
 923         if (skb == NULL) {
 924                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 925                         "%s(%s): NULL sk_buff passed",
 926                                         CTCM_FUNTAIL, dev->name);
 927                 priv->stats.tx_dropped++;
 928                                         goto done;
 929         }
 930         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 931                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 932                         "%s(%s): Got sk_buff with head room < %ld bytes",
 933                         CTCM_FUNTAIL, dev->name,
 934                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 935
 936                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 937
 938                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 939                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 940
 941                 if (!newskb) {
 942                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 943                                 "%s: %s: __dev_alloc_skb failed",
 944                                                 __func__, dev->name);
 945
 946                         dev_kfree_skb_any(skb);
 947                         priv->stats.tx_dropped++;
 948                         priv->stats.tx_errors++;
 949                         priv->stats.tx_carrier_errors++;
 950                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 951                                         goto done;
 952                 }
 953                 newskb->protocol = skb->protocol;
 954                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 955                 skb_put_data(newskb, skb->data, skb->len);
 956                 dev_kfree_skb_any(skb);
 957                 skb = newskb;
 958         }
 959
 960         /*
 961          * If channels are not running,
 962          * notify anybody about a link failure and throw
 963          * away packet.
 964          */
 965         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 966            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 967                 dev_kfree_skb_any(skb);
 968                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 969                         "%s(%s): inactive MPCGROUP - dropped",
 970                                         CTCM_FUNTAIL, dev->name);
 971                 priv->stats.tx_dropped++;
 972                 priv->stats.tx_errors++;
 973                 priv->stats.tx_carrier_errors++;
 974                                         goto done;
 975         }
 976
 977         if (ctcm_test_and_set_busy(dev)) {
 978                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 979                         "%s(%s): device busy - dropped",
 980                                         CTCM_FUNTAIL, dev->name);
 981                 dev_kfree_skb_any(skb);
 982                 priv->stats.tx_dropped++;
 983                 priv->stats.tx_errors++;
 984                 priv->stats.tx_carrier_errors++;
 985                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 986                                         goto done;
 987         }
 988
 989         netif_trans_update(dev);
 990         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
 991                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 992                         "%s(%s): device error - dropped",
 993                                         CTCM_FUNTAIL, dev->name);
 994                 dev_kfree_skb_any(skb);
 995                 priv->stats.tx_dropped++;
 996                 priv->stats.tx_errors++;
 997                 priv->stats.tx_carrier_errors++;
 998                 ctcm_clear_busy(dev);
 999                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1000                                         goto done;
1001         }
1002         ctcm_clear_busy(dev);
1003 done:
1004         if (do_debug)
1005                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1006
1007         return NETDEV_TX_OK;    /* handle freeing of skb here */
1008 }
1009
1010
1011 /**
1012  * Sets MTU of an interface.
1013  *
1014  *  dev         Pointer to interface struct.
1015  *  new_mtu     The new MTU to use for this interface.
1016  *
1017  * returns 0 on success, -EINVAL if MTU is out of valid range.
1018  *         (valid range is 576 .. 65527). If VM is on the
1019  *         remote side, maximum MTU is 32760, however this is
1020  *         not checked here.
1021  */
1022 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1023 {
1024         struct ctcm_priv *priv;
1025         int max_bufsize;
1026
1027         priv = dev->ml_priv;
1028         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1029
1030         if (IS_MPC(priv)) {
1031                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1032                         return -EINVAL;
1033                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1034         } else {
1035                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1036                         return -EINVAL;
1037                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1038         }
1039         dev->mtu = new_mtu;
1040         return 0;
1041 }
1042
1043 /**
1044  * Returns interface statistics of a device.
1045  *
1046  *  dev         Pointer to interface struct.
1047  *
1048  * returns Pointer to stats struct of this interface.
1049  */
1050 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1051 {
1052         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1053 }
1054
1055 static void ctcm_free_netdevice(struct net_device *dev)
1056 {
1057         struct ctcm_priv *priv;
1058         struct mpc_group *grp;
1059
1060         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1061                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1062         priv = dev->ml_priv;
1063         if (priv) {
1064                 grp = priv->mpcg;
1065                 if (grp) {
1066                         if (grp->fsm)
1067                                 kfree_fsm(grp->fsm);
1068                         dev_kfree_skb(grp->xid_skb);
1069                         dev_kfree_skb(grp->rcvd_xid_skb);
1070                         tasklet_kill(&grp->mpc_tasklet2);
1071                         kfree(grp);
1072                         priv->mpcg = NULL;
1073                 }
1074                 if (priv->fsm) {
1075                         kfree_fsm(priv->fsm);
1076                         priv->fsm = NULL;
1077                 }
1078                 kfree(priv->xid);
1079                 priv->xid = NULL;
1080         /*
1081          * Note: kfree(priv); is done in "opposite" function of
1082          * allocator function probe_device which is remove_device.
1083          */
1084         }
1085 #ifdef MODULE
1086         free_netdev(dev);
1087 #endif
1088 }
1089
1090 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1091
1092 static const struct net_device_ops ctcm_netdev_ops = {
1093         .ndo_open               = ctcm_open,
1094         .ndo_stop               = ctcm_close,
1095         .ndo_get_stats          = ctcm_stats,
1096         .ndo_change_mtu         = ctcm_change_mtu,
1097         .ndo_start_xmit         = ctcm_tx,
1098 };
1099
1100 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1101         .ndo_open               = ctcm_open,
1102         .ndo_stop               = ctcm_close,
1103         .ndo_get_stats          = ctcm_stats,
1104         .ndo_change_mtu         = ctcm_change_mtu,
1105         .ndo_start_xmit         = ctcmpc_tx,
1106 };
1107
1108 static void ctcm_dev_setup(struct net_device *dev)
1109 {
1110         dev->type = ARPHRD_SLIP;
1111         dev->tx_queue_len = 100;
1112         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1113         dev->min_mtu = 576;
1114         dev->max_mtu = 65527;
1115 }
1116
1117 /*
1118  * Initialize everything of the net device except the name and the
1119  * channel structs.
1120  */
1121 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1122 {
1123         struct net_device *dev;
1124         struct mpc_group *grp;
1125         if (!priv)
1126                 return NULL;
1127
1128         if (IS_MPC(priv))
1129                 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1130                                    ctcm_dev_setup);
1131         else
1132                 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1133                                    ctcm_dev_setup);
1134
1135         if (!dev) {
1136                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1137                         "%s: MEMORY allocation ERROR",
1138                         CTCM_FUNTAIL);
1139                 return NULL;
1140         }
1141         dev->ml_priv = priv;
1142         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1143                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1144                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1145         if (priv->fsm == NULL) {
1146                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1147                 free_netdev(dev);
1148                 return NULL;
1149         }
1150         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1151         fsm_settimer(priv->fsm, &priv->restart_timer);
1152
1153         if (IS_MPC(priv)) {
1154                 /*  MPC Group Initializations  */
1155                 grp = ctcmpc_init_mpc_group(priv);
1156                 if (grp == NULL) {
1157                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1158                         free_netdev(dev);
1159                         return NULL;
1160                 }
1161                 tasklet_init(&grp->mpc_tasklet2,
1162                                 mpc_group_ready, (unsigned long)dev);
1163                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1164                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1165
1166                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1167                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1168                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1169         } else {
1170                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1171                 dev->netdev_ops = &ctcm_netdev_ops;
1172                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1173         }
1174
1175         CTCMY_DBF_DEV(SETUP, dev, "finished");
1176
1177         return dev;
1178 }
1179
1180 /**
1181  * Main IRQ handler.
1182  *
1183  *  cdev        The ccw_device the interrupt is for.
1184  *  intparm     interruption parameter.
1185  *  irb         interruption response block.
1186  */
1187 static void ctcm_irq_handler(struct ccw_device *cdev,
1188                                 unsigned long intparm, struct irb *irb)
1189 {
1190         struct channel          *ch;
1191         struct net_device       *dev;
1192         struct ctcm_priv        *priv;
1193         struct ccwgroup_device  *cgdev;
1194         int cstat;
1195         int dstat;
1196
1197         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1198                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1199
1200         if (ctcm_check_irb_error(cdev, irb))
1201                 return;
1202
1203         cgdev = dev_get_drvdata(&cdev->dev);
1204
1205         cstat = irb->scsw.cmd.cstat;
1206         dstat = irb->scsw.cmd.dstat;
1207
1208         /* Check for unsolicited interrupts. */
1209         if (cgdev == NULL) {
1210                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1211                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1212                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1213                 dev_warn(&cdev->dev,
1214                         "The adapter received a non-specific IRQ\n");
1215                 return;
1216         }
1217
1218         priv = dev_get_drvdata(&cgdev->dev);
1219
1220         /* Try to extract channel from driver data. */
1221         if (priv->channel[CTCM_READ]->cdev == cdev)
1222                 ch = priv->channel[CTCM_READ];
1223         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1224                 ch = priv->channel[CTCM_WRITE];
1225         else {
1226                 dev_err(&cdev->dev,
1227                         "%s: Internal error: Can't determine channel for "
1228                         "interrupt device %s\n",
1229                         __func__, dev_name(&cdev->dev));
1230                         /* Explain: inconsistent internal structures */
1231                 return;
1232         }
1233
1234         dev = ch->netdev;
1235         if (dev == NULL) {
1236                 dev_err(&cdev->dev,
1237                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1238                         __func__, ch);
1239                         /* Explain: inconsistent internal structures */
1240                 return;
1241         }
1242
1243         /* Copy interruption response block. */
1244         memcpy(ch->irb, irb, sizeof(struct irb));
1245
1246         /* Issue error message and return on subchannel error code */
1247         if (irb->scsw.cmd.cstat) {
1248                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1249                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1250                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1251                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1252                 dev_warn(&cdev->dev,
1253                                 "A check occurred on the subchannel\n");
1254                 return;
1255         }
1256
1257         /* Check the reason-code of a unit check */
1258         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1259                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1260                         /* print it only once */
1261                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1262                                 "%s(%s): sense=%02x, ds=%02x",
1263                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1264                 ccw_unit_check(ch, irb->ecw[0]);
1265                 return;
1266         }
1267         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1268                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1269                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1270                 else
1271                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1272                 return;
1273         }
1274         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1275                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1276                 return;
1277         }
1278         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1279             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1280             (irb->scsw.cmd.stctl ==
1281              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1282                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1283         else
1284                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1285
1286 }
1287
1288 static const struct device_type ctcm_devtype = {
1289         .name = "ctcm",
1290         .groups = ctcm_attr_groups,
1291 };
1292
1293 /**
1294  * Add ctcm specific attributes.
1295  * Add ctcm private data.
1296  *
1297  *  cgdev       pointer to ccwgroup_device just added
1298  *
1299  * returns 0 on success, !0 on failure.
1300  */
1301 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1302 {
1303         struct ctcm_priv *priv;
1304
1305         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1306                         "%s %p",
1307                         __func__, cgdev);
1308
1309         if (!get_device(&cgdev->dev))
1310                 return -ENODEV;
1311
1312         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1313         if (!priv) {
1314                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1315                         "%s: memory allocation failure",
1316                         CTCM_FUNTAIL);
1317                 put_device(&cgdev->dev);
1318                 return -ENOMEM;
1319         }
1320         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1321         cgdev->cdev[0]->handler = ctcm_irq_handler;
1322         cgdev->cdev[1]->handler = ctcm_irq_handler;
1323         dev_set_drvdata(&cgdev->dev, priv);
1324         cgdev->dev.type = &ctcm_devtype;
1325
1326         return 0;
1327 }
1328
1329 /**
1330  * Add a new channel to the list of channels.
1331  * Keeps the channel list sorted.
1332  *
1333  *  cdev        The ccw_device to be added.
1334  *  type        The type class of the new channel.
1335  *  priv        Points to the private data of the ccwgroup_device.
1336  *
1337  * returns 0 on success, !0 on error.
1338  */
1339 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1340                                 struct ctcm_priv *priv)
1341 {
1342         struct channel **c = &channels;
1343         struct channel *ch;
1344         int ccw_num;
1345         int rc = 0;
1346
1347         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1348                 "%s(%s), type %d, proto %d",
1349                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1350
1351         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1352         if (ch == NULL)
1353                 return -ENOMEM;
1354
1355         ch->protocol = priv->protocol;
1356         if (IS_MPC(priv)) {
1357                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1358                 if (ch->discontact_th == NULL)
1359                                         goto nomem_return;
1360
1361                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1362                 tasklet_init(&ch->ch_disc_tasklet,
1363                         mpc_action_send_discontact, (unsigned long)ch);
1364
1365                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1366                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1367                 ccw_num = 17;
1368         } else
1369                 ccw_num = 8;
1370
1371         ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1372         if (ch->ccw == NULL)
1373                                         goto nomem_return;
1374
1375         ch->cdev = cdev;
1376         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1377         ch->type = type;
1378
1379         /**
1380          * "static" ccws are used in the following way:
1381          *
1382          * ccw[0..2] (Channel program for generic I/O):
1383          *           0: prepare
1384          *           1: read or write (depending on direction) with fixed
1385          *              buffer (idal allocated once when buffer is allocated)
1386          *           2: nop
1387          * ccw[3..5] (Channel program for direct write of packets)
1388          *           3: prepare
1389          *           4: write (idal allocated on every write).
1390          *           5: nop
1391          * ccw[6..7] (Channel program for initial channel setup):
1392          *           6: set extended mode
1393          *           7: nop
1394          *
1395          * ch->ccw[0..5] are initialized in ch_action_start because
1396          * the channel's direction is yet unknown here.
1397          *
1398          * ccws used for xid2 negotiations
1399          *  ch-ccw[8-14] need to be used for the XID exchange either
1400          *    X side XID2 Processing
1401          *       8:  write control
1402          *       9:  write th
1403          *           10: write XID
1404          *           11: read th from secondary
1405          *           12: read XID   from secondary
1406          *           13: read 4 byte ID
1407          *           14: nop
1408          *    Y side XID Processing
1409          *           8:  sense
1410          *       9:  read th
1411          *           10: read XID
1412          *           11: write th
1413          *           12: write XID
1414          *           13: write 4 byte ID
1415          *           14: nop
1416          *
1417          *  ccws used for double noop due to VM timing issues
1418          *  which result in unrecoverable Busy on channel
1419          *       15: nop
1420          *       16: nop
1421          */
1422         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1423         ch->ccw[6].flags        = CCW_FLAG_SLI;
1424
1425         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1426         ch->ccw[7].flags        = CCW_FLAG_SLI;
1427
1428         if (IS_MPC(priv)) {
1429                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1430                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1431                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1432                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1433
1434                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1435                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1436
1437                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1438                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1439                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1440                                 mpc_ch_fsm_len, GFP_KERNEL);
1441         } else {
1442                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1443                                 ctc_ch_event_names, CTC_NR_STATES,
1444                                 CTC_NR_EVENTS, ch_fsm,
1445                                 ch_fsm_len, GFP_KERNEL);
1446         }
1447         if (ch->fsm == NULL)
1448                                 goto nomem_return;
1449
1450         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1451
1452         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1453         if (ch->irb == NULL)
1454                                 goto nomem_return;
1455
1456         while (*c && ctcm_less_than((*c)->id, ch->id))
1457                 c = &(*c)->next;
1458
1459         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1460                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1461                                 "%s (%s) already in list, using old entry",
1462                                 __func__, (*c)->id);
1463
1464                                 goto free_return;
1465         }
1466
1467         spin_lock_init(&ch->collect_lock);
1468
1469         fsm_settimer(ch->fsm, &ch->timer);
1470         skb_queue_head_init(&ch->io_queue);
1471         skb_queue_head_init(&ch->collect_queue);
1472
1473         if (IS_MPC(priv)) {
1474                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1475                 skb_queue_head_init(&ch->sweep_queue);
1476         }
1477         ch->next = *c;
1478         *c = ch;
1479         return 0;
1480
1481 nomem_return:
1482         rc = -ENOMEM;
1483
1484 free_return:    /* note that all channel pointers are 0 or valid */
1485         kfree(ch->ccw);
1486         kfree(ch->discontact_th);
1487         kfree_fsm(ch->fsm);
1488         kfree(ch->irb);
1489         kfree(ch);
1490         return rc;
1491 }
1492
1493 /*
1494  * Return type of a detected device.
1495  */
1496 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1497 {
1498         enum ctcm_channel_types type;
1499         type = (enum ctcm_channel_types)id->driver_info;
1500
1501         if (type == ctcm_channel_type_ficon)
1502                 type = ctcm_channel_type_escon;
1503
1504         return type;
1505 }
1506
1507 /**
1508  *
1509  * Setup an interface.
1510  *
1511  *  cgdev       Device to be setup.
1512  *
1513  * returns 0 on success, !0 on failure.
1514  */
1515 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1516 {
1517         char read_id[CTCM_ID_SIZE];
1518         char write_id[CTCM_ID_SIZE];
1519         int direction;
1520         enum ctcm_channel_types type;
1521         struct ctcm_priv *priv;
1522         struct net_device *dev;
1523         struct ccw_device *cdev0;
1524         struct ccw_device *cdev1;
1525         struct channel *readc;
1526         struct channel *writec;
1527         int ret;
1528         int result;
1529
1530         priv = dev_get_drvdata(&cgdev->dev);
1531         if (!priv) {
1532                 result = -ENODEV;
1533                 goto out_err_result;
1534         }
1535
1536         cdev0 = cgdev->cdev[0];
1537         cdev1 = cgdev->cdev[1];
1538
1539         type = get_channel_type(&cdev0->id);
1540
1541         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1542         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1543
1544         ret = add_channel(cdev0, type, priv);
1545         if (ret) {
1546                 result = ret;
1547                 goto out_err_result;
1548         }
1549         ret = add_channel(cdev1, type, priv);
1550         if (ret) {
1551                 result = ret;
1552                 goto out_remove_channel1;
1553         }
1554
1555         ret = ccw_device_set_online(cdev0);
1556         if (ret != 0) {
1557                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1558                         "%s(%s) set_online rc=%d",
1559                                 CTCM_FUNTAIL, read_id, ret);
1560                 result = -EIO;
1561                 goto out_remove_channel2;
1562         }
1563
1564         ret = ccw_device_set_online(cdev1);
1565         if (ret != 0) {
1566                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1567                         "%s(%s) set_online rc=%d",
1568                                 CTCM_FUNTAIL, write_id, ret);
1569
1570                 result = -EIO;
1571                 goto out_ccw1;
1572         }
1573
1574         dev = ctcm_init_netdevice(priv);
1575         if (dev == NULL) {
1576                 result = -ENODEV;
1577                 goto out_ccw2;
1578         }
1579
1580         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1581                 priv->channel[direction] =
1582                         channel_get(type, direction == CTCM_READ ?
1583                                 read_id : write_id, direction);
1584                 if (priv->channel[direction] == NULL) {
1585                         if (direction == CTCM_WRITE)
1586                                 channel_free(priv->channel[CTCM_READ]);
1587                         result = -ENODEV;
1588                         goto out_dev;
1589                 }
1590                 priv->channel[direction]->netdev = dev;
1591                 priv->channel[direction]->protocol = priv->protocol;
1592                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1593         }
1594         /* sysfs magic */
1595         SET_NETDEV_DEV(dev, &cgdev->dev);
1596
1597         if (register_netdev(dev)) {
1598                 result = -ENODEV;
1599                 goto out_dev;
1600         }
1601
1602         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1603
1604         dev_info(&dev->dev,
1605                 "setup OK : r/w = %s/%s, protocol : %d\n",
1606                         priv->channel[CTCM_READ]->id,
1607                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1608
1609         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1610                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1611                         priv->channel[CTCM_READ]->id,
1612                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1613
1614         return 0;
1615 out_dev:
1616         ctcm_free_netdevice(dev);
1617 out_ccw2:
1618         ccw_device_set_offline(cgdev->cdev[1]);
1619 out_ccw1:
1620         ccw_device_set_offline(cgdev->cdev[0]);
1621 out_remove_channel2:
1622         readc = channel_get(type, read_id, CTCM_READ);
1623         channel_remove(readc);
1624 out_remove_channel1:
1625         writec = channel_get(type, write_id, CTCM_WRITE);
1626         channel_remove(writec);
1627 out_err_result:
1628         return result;
1629 }
1630
1631 /**
1632  * Shutdown an interface.
1633  *
1634  *  cgdev       Device to be shut down.
1635  *
1636  * returns 0 on success, !0 on failure.
1637  */
1638 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1639 {
1640         struct ctcm_priv *priv;
1641         struct net_device *dev;
1642
1643         priv = dev_get_drvdata(&cgdev->dev);
1644         if (!priv)
1645                 return -ENODEV;
1646
1647         if (priv->channel[CTCM_READ]) {
1648                 dev = priv->channel[CTCM_READ]->netdev;
1649                 CTCM_DBF_DEV(SETUP, dev, "");
1650                 /* Close the device */
1651                 ctcm_close(dev);
1652                 dev->flags &= ~IFF_RUNNING;
1653                 channel_free(priv->channel[CTCM_READ]);
1654         } else
1655                 dev = NULL;
1656
1657         if (priv->channel[CTCM_WRITE])
1658                 channel_free(priv->channel[CTCM_WRITE]);
1659
1660         if (dev) {
1661                 unregister_netdev(dev);
1662                 ctcm_free_netdevice(dev);
1663         }
1664
1665         if (priv->fsm)
1666                 kfree_fsm(priv->fsm);
1667
1668         ccw_device_set_offline(cgdev->cdev[1]);
1669         ccw_device_set_offline(cgdev->cdev[0]);
1670         channel_remove(priv->channel[CTCM_READ]);
1671         channel_remove(priv->channel[CTCM_WRITE]);
1672         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1673
1674         return 0;
1675
1676 }
1677
1678
1679 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1680 {
1681         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1682
1683         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1684                         "removing device %p, proto : %d",
1685                         cgdev, priv->protocol);
1686
1687         if (cgdev->state == CCWGROUP_ONLINE)
1688                 ctcm_shutdown_device(cgdev);
1689         dev_set_drvdata(&cgdev->dev, NULL);
1690         kfree(priv);
1691         put_device(&cgdev->dev);
1692 }
1693
1694 static struct ccw_device_id ctcm_ids[] = {
1695         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1696         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1697         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1698         {},
1699 };
1700 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1701
1702 static struct ccw_driver ctcm_ccw_driver = {
1703         .driver = {
1704                 .owner  = THIS_MODULE,
1705                 .name   = "ctcm",
1706         },
1707         .ids    = ctcm_ids,
1708         .probe  = ccwgroup_probe_ccwdev,
1709         .remove = ccwgroup_remove_ccwdev,
1710         .int_class = IRQIO_CTC,
1711 };
1712
1713 static struct ccwgroup_driver ctcm_group_driver = {
1714         .driver = {
1715                 .owner  = THIS_MODULE,
1716                 .name   = CTC_DRIVER_NAME,
1717         },
1718         .ccw_driver  = &ctcm_ccw_driver,
1719         .setup       = ctcm_probe_device,
1720         .remove      = ctcm_remove_device,
1721         .set_online  = ctcm_new_device,
1722         .set_offline = ctcm_shutdown_device,
1723 };
1724
1725 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1726                            size_t count)
1727 {
1728         int err;
1729
1730         err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1731         return err ? err : count;
1732 }
1733 static DRIVER_ATTR_WO(group);
1734
1735 static struct attribute *ctcm_drv_attrs[] = {
1736         &driver_attr_group.attr,
1737         NULL,
1738 };
1739 static struct attribute_group ctcm_drv_attr_group = {
1740         .attrs = ctcm_drv_attrs,
1741 };
1742 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1743         &ctcm_drv_attr_group,
1744         NULL,
1745 };
1746
1747 /*
1748  * Module related routines
1749  */
1750
1751 /*
1752  * Prepare to be unloaded. Free IRQ's and release all resources.
1753  * This is called just before this module is unloaded. It is
1754  * not called, if the usage count is !0, so we don't need to check
1755  * for that.
1756  */
1757 static void __exit ctcm_exit(void)
1758 {
1759         ccwgroup_driver_unregister(&ctcm_group_driver);
1760         ccw_driver_unregister(&ctcm_ccw_driver);
1761         root_device_unregister(ctcm_root_dev);
1762         ctcm_unregister_dbf_views();
1763         pr_info("CTCM driver unloaded\n");
1764 }
1765
1766 /*
1767  * Print Banner.
1768  */
1769 static void print_banner(void)
1770 {
1771         pr_info("CTCM driver initialized\n");
1772 }
1773
1774 /**
1775  * Initialize module.
1776  * This is called just after the module is loaded.
1777  *
1778  * returns 0 on success, !0 on error.
1779  */
1780 static int __init ctcm_init(void)
1781 {
1782         int ret;
1783
1784         channels = NULL;
1785
1786         ret = ctcm_register_dbf_views();
1787         if (ret)
1788                 goto out_err;
1789         ctcm_root_dev = root_device_register("ctcm");
1790         ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1791         if (ret)
1792                 goto register_err;
1793         ret = ccw_driver_register(&ctcm_ccw_driver);
1794         if (ret)
1795                 goto ccw_err;
1796         ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1797         ret = ccwgroup_driver_register(&ctcm_group_driver);
1798         if (ret)
1799                 goto ccwgroup_err;
1800         print_banner();
1801         return 0;
1802
1803 ccwgroup_err:
1804         ccw_driver_unregister(&ctcm_ccw_driver);
1805 ccw_err:
1806         root_device_unregister(ctcm_root_dev);
1807 register_err:
1808         ctcm_unregister_dbf_views();
1809 out_err:
1810         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1811                 __func__, ret);
1812         return ret;
1813 }
1814
1815 module_init(ctcm_init);
1816 module_exit(ctcm_exit);
1817
1818 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1819 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1820 MODULE_LICENSE("GPL");
1821