linux/drivers/s390/net/ctcm_main.c
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   1/*
   2 * Copyright IBM Corp. 2001, 2009
   3 * Author(s):
   4 *      Original CTC driver(s):
   5 *              Fritz Elfert (felfert@millenux.com)
   6 *              Dieter Wellerdiek (wel@de.ibm.com)
   7 *              Martin Schwidefsky (schwidefsky@de.ibm.com)
   8 *              Denis Joseph Barrow (barrow_dj@yahoo.com)
   9 *              Jochen Roehrig (roehrig@de.ibm.com)
  10 *              Cornelia Huck <cornelia.huck@de.ibm.com>
  11 *      MPC additions:
  12 *              Belinda Thompson (belindat@us.ibm.com)
  13 *              Andy Richter (richtera@us.ibm.com)
  14 *      Revived by:
  15 *              Peter Tiedemann (ptiedem@de.ibm.com)
  16 */
  17
  18#undef DEBUG
  19#undef DEBUGDATA
  20#undef DEBUGCCW
  21
  22#define KMSG_COMPONENT "ctcm"
  23#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
  24
  25#include <linux/module.h>
  26#include <linux/init.h>
  27#include <linux/kernel.h>
  28#include <linux/slab.h>
  29#include <linux/errno.h>
  30#include <linux/types.h>
  31#include <linux/interrupt.h>
  32#include <linux/timer.h>
  33#include <linux/bitops.h>
  34
  35#include <linux/signal.h>
  36#include <linux/string.h>
  37
  38#include <linux/ip.h>
  39#include <linux/if_arp.h>
  40#include <linux/tcp.h>
  41#include <linux/skbuff.h>
  42#include <linux/ctype.h>
  43#include <net/dst.h>
  44
  45#include <linux/io.h>
  46#include <asm/ccwdev.h>
  47#include <asm/ccwgroup.h>
  48#include <linux/uaccess.h>
  49
  50#include <asm/idals.h>
  51
  52#include "ctcm_fsms.h"
  53#include "ctcm_main.h"
  54
  55/* Some common global variables */
  56
  57/**
  58 * The root device for ctcm group devices
  59 */
  60static struct device *ctcm_root_dev;
  61
  62/*
  63 * Linked list of all detected channels.
  64 */
  65struct channel *channels;
  66
  67/**
  68 * Unpack a just received skb and hand it over to
  69 * upper layers.
  70 *
  71 *  ch          The channel where this skb has been received.
  72 *  pskb        The received skb.
  73 */
  74void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
  75{
  76        struct net_device *dev = ch->netdev;
  77        struct ctcm_priv *priv = dev->ml_priv;
  78        __u16 len = *((__u16 *) pskb->data);
  79
  80        skb_put(pskb, 2 + LL_HEADER_LENGTH);
  81        skb_pull(pskb, 2);
  82        pskb->dev = dev;
  83        pskb->ip_summed = CHECKSUM_UNNECESSARY;
  84        while (len > 0) {
  85                struct sk_buff *skb;
  86                int skblen;
  87                struct ll_header *header = (struct ll_header *)pskb->data;
  88
  89                skb_pull(pskb, LL_HEADER_LENGTH);
  90                if ((ch->protocol == CTCM_PROTO_S390) &&
  91                    (header->type != ETH_P_IP)) {
  92                        if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
  93                                ch->logflags |= LOG_FLAG_ILLEGALPKT;
  94                                /*
  95                                 * Check packet type only if we stick strictly
  96                                 * to S/390's protocol of OS390. This only
  97                                 * supports IP. Otherwise allow any packet
  98                                 * type.
  99                                 */
 100                                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 101                                        "%s(%s): Illegal packet type 0x%04x"
 102                                        " - dropping",
 103                                        CTCM_FUNTAIL, dev->name, header->type);
 104                        }
 105                        priv->stats.rx_dropped++;
 106                        priv->stats.rx_frame_errors++;
 107                        return;
 108                }
 109                pskb->protocol = ntohs(header->type);
 110                if ((header->length <= LL_HEADER_LENGTH) ||
 111                    (len <= LL_HEADER_LENGTH)) {
 112                        if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
 113                                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 114                                        "%s(%s): Illegal packet size %d(%d,%d)"
 115                                        "- dropping",
 116                                        CTCM_FUNTAIL, dev->name,
 117                                        header->length, dev->mtu, len);
 118                                ch->logflags |= LOG_FLAG_ILLEGALSIZE;
 119                        }
 120
 121                        priv->stats.rx_dropped++;
 122                        priv->stats.rx_length_errors++;
 123                        return;
 124                }
 125                header->length -= LL_HEADER_LENGTH;
 126                len -= LL_HEADER_LENGTH;
 127                if ((header->length > skb_tailroom(pskb)) ||
 128                        (header->length > len)) {
 129                        if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
 130                                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 131                                        "%s(%s): Packet size %d (overrun)"
 132                                        " - dropping", CTCM_FUNTAIL,
 133                                                dev->name, header->length);
 134                                ch->logflags |= LOG_FLAG_OVERRUN;
 135                        }
 136
 137                        priv->stats.rx_dropped++;
 138                        priv->stats.rx_length_errors++;
 139                        return;
 140                }
 141                skb_put(pskb, header->length);
 142                skb_reset_mac_header(pskb);
 143                len -= header->length;
 144                skb = dev_alloc_skb(pskb->len);
 145                if (!skb) {
 146                        if (!(ch->logflags & LOG_FLAG_NOMEM)) {
 147                                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 148                                        "%s(%s): MEMORY allocation error",
 149                                                CTCM_FUNTAIL, dev->name);
 150                                ch->logflags |= LOG_FLAG_NOMEM;
 151                        }
 152                        priv->stats.rx_dropped++;
 153                        return;
 154                }
 155                skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
 156                                          pskb->len);
 157                skb_reset_mac_header(skb);
 158                skb->dev = pskb->dev;
 159                skb->protocol = pskb->protocol;
 160                pskb->ip_summed = CHECKSUM_UNNECESSARY;
 161                skblen = skb->len;
 162                /*
 163                 * reset logflags
 164                 */
 165                ch->logflags = 0;
 166                priv->stats.rx_packets++;
 167                priv->stats.rx_bytes += skblen;
 168                netif_rx_ni(skb);
 169                if (len > 0) {
 170                        skb_pull(pskb, header->length);
 171                        if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
 172                                CTCM_DBF_DEV_NAME(TRACE, dev,
 173                                        "Overrun in ctcm_unpack_skb");
 174                                ch->logflags |= LOG_FLAG_OVERRUN;
 175                                return;
 176                        }
 177                        skb_put(pskb, LL_HEADER_LENGTH);
 178                }
 179        }
 180}
 181
 182/**
 183 * Release a specific channel in the channel list.
 184 *
 185 *  ch          Pointer to channel struct to be released.
 186 */
 187static void channel_free(struct channel *ch)
 188{
 189        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
 190        ch->flags &= ~CHANNEL_FLAGS_INUSE;
 191        fsm_newstate(ch->fsm, CTC_STATE_IDLE);
 192}
 193
 194/**
 195 * Remove a specific channel in the channel list.
 196 *
 197 *  ch          Pointer to channel struct to be released.
 198 */
 199static void channel_remove(struct channel *ch)
 200{
 201        struct channel **c = &channels;
 202        char chid[CTCM_ID_SIZE+1];
 203        int ok = 0;
 204
 205        if (ch == NULL)
 206                return;
 207        else
 208                strncpy(chid, ch->id, CTCM_ID_SIZE);
 209
 210        channel_free(ch);
 211        while (*c) {
 212                if (*c == ch) {
 213                        *c = ch->next;
 214                        fsm_deltimer(&ch->timer);
 215                        if (IS_MPC(ch))
 216                                fsm_deltimer(&ch->sweep_timer);
 217
 218                        kfree_fsm(ch->fsm);
 219                        clear_normalized_cda(&ch->ccw[4]);
 220                        if (ch->trans_skb != NULL) {
 221                                clear_normalized_cda(&ch->ccw[1]);
 222                                dev_kfree_skb_any(ch->trans_skb);
 223                        }
 224                        if (IS_MPC(ch)) {
 225                                tasklet_kill(&ch->ch_tasklet);
 226                                tasklet_kill(&ch->ch_disc_tasklet);
 227                                kfree(ch->discontact_th);
 228                        }
 229                        kfree(ch->ccw);
 230                        kfree(ch->irb);
 231                        kfree(ch);
 232                        ok = 1;
 233                        break;
 234                }
 235                c = &((*c)->next);
 236        }
 237
 238        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
 239                        chid, ok ? "OK" : "failed");
 240}
 241
 242/**
 243 * Get a specific channel from the channel list.
 244 *
 245 *  type        Type of channel we are interested in.
 246 *  id          Id of channel we are interested in.
 247 *  direction   Direction we want to use this channel for.
 248 *
 249 * returns Pointer to a channel or NULL if no matching channel available.
 250 */
 251static struct channel *channel_get(enum ctcm_channel_types type,
 252                                        char *id, int direction)
 253{
 254        struct channel *ch = channels;
 255
 256        while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
 257                ch = ch->next;
 258        if (!ch) {
 259                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 260                                "%s(%d, %s, %d) not found in channel list\n",
 261                                CTCM_FUNTAIL, type, id, direction);
 262        } else {
 263                if (ch->flags & CHANNEL_FLAGS_INUSE)
 264                        ch = NULL;
 265                else {
 266                        ch->flags |= CHANNEL_FLAGS_INUSE;
 267                        ch->flags &= ~CHANNEL_FLAGS_RWMASK;
 268                        ch->flags |= (direction == CTCM_WRITE)
 269                            ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
 270                        fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
 271                }
 272        }
 273        return ch;
 274}
 275
 276static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
 277{
 278        if (!IS_ERR(irb))
 279                return 0;
 280
 281        CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
 282                        "irb error %ld on device %s\n",
 283                                PTR_ERR(irb), dev_name(&cdev->dev));
 284
 285        switch (PTR_ERR(irb)) {
 286        case -EIO:
 287                dev_err(&cdev->dev,
 288                        "An I/O-error occurred on the CTCM device\n");
 289                break;
 290        case -ETIMEDOUT:
 291                dev_err(&cdev->dev,
 292                        "An adapter hardware operation timed out\n");
 293                break;
 294        default:
 295                dev_err(&cdev->dev,
 296                        "An error occurred on the adapter hardware\n");
 297        }
 298        return PTR_ERR(irb);
 299}
 300
 301
 302/**
 303 * Check sense of a unit check.
 304 *
 305 *  ch          The channel, the sense code belongs to.
 306 *  sense       The sense code to inspect.
 307 */
 308static inline void ccw_unit_check(struct channel *ch, __u8 sense)
 309{
 310        CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
 311                        "%s(%s): %02x",
 312                                CTCM_FUNTAIL, ch->id, sense);
 313
 314        if (sense & SNS0_INTERVENTION_REQ) {
 315                if (sense & 0x01) {
 316                        if (ch->sense_rc != 0x01) {
 317                                pr_notice(
 318                                        "%s: The communication peer has "
 319                                        "disconnected\n", ch->id);
 320                                ch->sense_rc = 0x01;
 321                        }
 322                        fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
 323                } else {
 324                        if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
 325                                pr_notice(
 326                                        "%s: The remote operating system is "
 327                                        "not available\n", ch->id);
 328                                ch->sense_rc = SNS0_INTERVENTION_REQ;
 329                        }
 330                        fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
 331                }
 332        } else if (sense & SNS0_EQUIPMENT_CHECK) {
 333                if (sense & SNS0_BUS_OUT_CHECK) {
 334                        if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 335                                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 336                                        "%s(%s): remote HW error %02x",
 337                                                CTCM_FUNTAIL, ch->id, sense);
 338                                ch->sense_rc = SNS0_BUS_OUT_CHECK;
 339                        }
 340                        fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
 341                } else {
 342                        if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
 343                                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 344                                        "%s(%s): remote read parity error %02x",
 345                                                CTCM_FUNTAIL, ch->id, sense);
 346                                ch->sense_rc = SNS0_EQUIPMENT_CHECK;
 347                        }
 348                        fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
 349                }
 350        } else if (sense & SNS0_BUS_OUT_CHECK) {
 351                if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
 352                        CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 353                                "%s(%s): BUS OUT error %02x",
 354                                        CTCM_FUNTAIL, ch->id, sense);
 355                        ch->sense_rc = SNS0_BUS_OUT_CHECK;
 356                }
 357                if (sense & 0x04)       /* data-streaming timeout */
 358                        fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
 359                else                    /* Data-transfer parity error */
 360                        fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
 361        } else if (sense & SNS0_CMD_REJECT) {
 362                if (ch->sense_rc != SNS0_CMD_REJECT) {
 363                        CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 364                                "%s(%s): Command rejected",
 365                                                CTCM_FUNTAIL, ch->id);
 366                        ch->sense_rc = SNS0_CMD_REJECT;
 367                }
 368        } else if (sense == 0) {
 369                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 370                        "%s(%s): Unit check ZERO",
 371                                        CTCM_FUNTAIL, ch->id);
 372                fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
 373        } else {
 374                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
 375                        "%s(%s): Unit check code %02x unknown",
 376                                        CTCM_FUNTAIL, ch->id, sense);
 377                fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
 378        }
 379}
 380
 381int ctcm_ch_alloc_buffer(struct channel *ch)
 382{
 383        clear_normalized_cda(&ch->ccw[1]);
 384        ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
 385        if (ch->trans_skb == NULL) {
 386                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 387                        "%s(%s): %s trans_skb allocation error",
 388                        CTCM_FUNTAIL, ch->id,
 389                        (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 390                                "RX" : "TX");
 391                return -ENOMEM;
 392        }
 393
 394        ch->ccw[1].count = ch->max_bufsize;
 395        if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
 396                dev_kfree_skb(ch->trans_skb);
 397                ch->trans_skb = NULL;
 398                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 399                        "%s(%s): %s set norm_cda failed",
 400                        CTCM_FUNTAIL, ch->id,
 401                        (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
 402                                "RX" : "TX");
 403                return -ENOMEM;
 404        }
 405
 406        ch->ccw[1].count = 0;
 407        ch->trans_skb_data = ch->trans_skb->data;
 408        ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
 409        return 0;
 410}
 411
 412/*
 413 * Interface API for upper network layers
 414 */
 415
 416/**
 417 * Open an interface.
 418 * Called from generic network layer when ifconfig up is run.
 419 *
 420 *  dev         Pointer to interface struct.
 421 *
 422 * returns 0 on success, -ERRNO on failure. (Never fails.)
 423 */
 424int ctcm_open(struct net_device *dev)
 425{
 426        struct ctcm_priv *priv = dev->ml_priv;
 427
 428        CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 429        if (!IS_MPC(priv))
 430                fsm_event(priv->fsm,    DEV_EVENT_START, dev);
 431        return 0;
 432}
 433
 434/**
 435 * Close an interface.
 436 * Called from generic network layer when ifconfig down is run.
 437 *
 438 *  dev         Pointer to interface struct.
 439 *
 440 * returns 0 on success, -ERRNO on failure. (Never fails.)
 441 */
 442int ctcm_close(struct net_device *dev)
 443{
 444        struct ctcm_priv *priv = dev->ml_priv;
 445
 446        CTCMY_DBF_DEV_NAME(SETUP, dev, "");
 447        if (!IS_MPC(priv))
 448                fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
 449        return 0;
 450}
 451
 452
 453/**
 454 * Transmit a packet.
 455 * This is a helper function for ctcm_tx().
 456 *
 457 *  ch          Channel to be used for sending.
 458 *  skb         Pointer to struct sk_buff of packet to send.
 459 *            The linklevel header has already been set up
 460 *            by ctcm_tx().
 461 *
 462 * returns 0 on success, -ERRNO on failure. (Never fails.)
 463 */
 464static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
 465{
 466        unsigned long saveflags;
 467        struct ll_header header;
 468        int rc = 0;
 469        __u16 block_len;
 470        int ccw_idx;
 471        struct sk_buff *nskb;
 472        unsigned long hi;
 473
 474        /* we need to acquire the lock for testing the state
 475         * otherwise we can have an IRQ changing the state to
 476         * TXIDLE after the test but before acquiring the lock.
 477         */
 478        spin_lock_irqsave(&ch->collect_lock, saveflags);
 479        if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
 480                int l = skb->len + LL_HEADER_LENGTH;
 481
 482                if (ch->collect_len + l > ch->max_bufsize - 2) {
 483                        spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 484                        return -EBUSY;
 485                } else {
 486                        atomic_inc(&skb->users);
 487                        header.length = l;
 488                        header.type = skb->protocol;
 489                        header.unused = 0;
 490                        memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
 491                               LL_HEADER_LENGTH);
 492                        skb_queue_tail(&ch->collect_queue, skb);
 493                        ch->collect_len += l;
 494                }
 495                spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 496                                goto done;
 497        }
 498        spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 499        /*
 500         * Protect skb against beeing free'd by upper
 501         * layers.
 502         */
 503        atomic_inc(&skb->users);
 504        ch->prof.txlen += skb->len;
 505        header.length = skb->len + LL_HEADER_LENGTH;
 506        header.type = skb->protocol;
 507        header.unused = 0;
 508        memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
 509        block_len = skb->len + 2;
 510        *((__u16 *)skb_push(skb, 2)) = block_len;
 511
 512        /*
 513         * IDAL support in CTCM is broken, so we have to
 514         * care about skb's above 2G ourselves.
 515         */
 516        hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
 517        if (hi) {
 518                nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 519                if (!nskb) {
 520                        atomic_dec(&skb->users);
 521                        skb_pull(skb, LL_HEADER_LENGTH + 2);
 522                        ctcm_clear_busy(ch->netdev);
 523                        return -ENOMEM;
 524                } else {
 525                        memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 526                        atomic_inc(&nskb->users);
 527                        atomic_dec(&skb->users);
 528                        dev_kfree_skb_irq(skb);
 529                        skb = nskb;
 530                }
 531        }
 532
 533        ch->ccw[4].count = block_len;
 534        if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 535                /*
 536                 * idal allocation failed, try via copying to
 537                 * trans_skb. trans_skb usually has a pre-allocated
 538                 * idal.
 539                 */
 540                if (ctcm_checkalloc_buffer(ch)) {
 541                        /*
 542                         * Remove our header. It gets added
 543                         * again on retransmit.
 544                         */
 545                        atomic_dec(&skb->users);
 546                        skb_pull(skb, LL_HEADER_LENGTH + 2);
 547                        ctcm_clear_busy(ch->netdev);
 548                        return -ENOMEM;
 549                }
 550
 551                skb_reset_tail_pointer(ch->trans_skb);
 552                ch->trans_skb->len = 0;
 553                ch->ccw[1].count = skb->len;
 554                skb_copy_from_linear_data(skb,
 555                                skb_put(ch->trans_skb, skb->len), skb->len);
 556                atomic_dec(&skb->users);
 557                dev_kfree_skb_irq(skb);
 558                ccw_idx = 0;
 559        } else {
 560                skb_queue_tail(&ch->io_queue, skb);
 561                ccw_idx = 3;
 562        }
 563        if (do_debug_ccw)
 564                ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 565                                        sizeof(struct ccw1) * 3);
 566        ch->retry = 0;
 567        fsm_newstate(ch->fsm, CTC_STATE_TX);
 568        fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 569        spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 570        ch->prof.send_stamp = jiffies;
 571        rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 572                                        (unsigned long)ch, 0xff, 0);
 573        spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 574        if (ccw_idx == 3)
 575                ch->prof.doios_single++;
 576        if (rc != 0) {
 577                fsm_deltimer(&ch->timer);
 578                ctcm_ccw_check_rc(ch, rc, "single skb TX");
 579                if (ccw_idx == 3)
 580                        skb_dequeue_tail(&ch->io_queue);
 581                /*
 582                 * Remove our header. It gets added
 583                 * again on retransmit.
 584                 */
 585                skb_pull(skb, LL_HEADER_LENGTH + 2);
 586        } else if (ccw_idx == 0) {
 587                struct net_device *dev = ch->netdev;
 588                struct ctcm_priv *priv = dev->ml_priv;
 589                priv->stats.tx_packets++;
 590                priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
 591        }
 592done:
 593        ctcm_clear_busy(ch->netdev);
 594        return rc;
 595}
 596
 597static void ctcmpc_send_sweep_req(struct channel *rch)
 598{
 599        struct net_device *dev = rch->netdev;
 600        struct ctcm_priv *priv;
 601        struct mpc_group *grp;
 602        struct th_sweep *header;
 603        struct sk_buff *sweep_skb;
 604        struct channel *ch;
 605        /* int rc = 0; */
 606
 607        priv = dev->ml_priv;
 608        grp = priv->mpcg;
 609        ch = priv->channel[CTCM_WRITE];
 610
 611        /* sweep processing is not complete until response and request */
 612        /* has completed for all read channels in group                */
 613        if (grp->in_sweep == 0) {
 614                grp->in_sweep = 1;
 615                grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
 616                grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
 617        }
 618
 619        sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
 620
 621        if (sweep_skb == NULL)  {
 622                /* rc = -ENOMEM; */
 623                                goto nomem;
 624        }
 625
 626        header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
 627
 628        if (!header) {
 629                dev_kfree_skb_any(sweep_skb);
 630                /* rc = -ENOMEM; */
 631                                goto nomem;
 632        }
 633
 634        header->th.th_seg       = 0x00 ;
 635        header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
 636        header->th.th_blk_flag  = 0x00;
 637        header->th.th_is_xid    = 0x00;
 638        header->th.th_seq_num   = 0x00;
 639        header->sw.th_last_seq  = ch->th_seq_num;
 640
 641        memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
 642
 643        kfree(header);
 644
 645        netif_trans_update(dev);
 646        skb_queue_tail(&ch->sweep_queue, sweep_skb);
 647
 648        fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
 649
 650        return;
 651
 652nomem:
 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 */
 663static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
 664{
 665        struct pdu *p_header;
 666        struct net_device *dev = ch->netdev;
 667        struct ctcm_priv *priv = dev->ml_priv;
 668        struct mpc_group *grp = priv->mpcg;
 669        struct th_header *header;
 670        struct sk_buff *nskb;
 671        int rc = 0;
 672        int ccw_idx;
 673        unsigned long hi;
 674        unsigned long saveflags = 0;    /* avoids compiler warning */
 675
 676        CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
 677                        __func__, dev->name, smp_processor_id(), ch,
 678                                        ch->id, fsm_getstate_str(ch->fsm));
 679
 680        if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
 681                spin_lock_irqsave(&ch->collect_lock, saveflags);
 682                atomic_inc(&skb->users);
 683                p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 684
 685                if (!p_header) {
 686                        spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 687                                goto nomem_exit;
 688                }
 689
 690                p_header->pdu_offset = skb->len;
 691                p_header->pdu_proto = 0x01;
 692                p_header->pdu_flag = 0x00;
 693                if (skb->protocol == ntohs(ETH_P_SNAP)) {
 694                        p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 695                } else {
 696                        p_header->pdu_flag |= PDU_FIRST;
 697                }
 698                p_header->pdu_seq = 0;
 699                memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
 700                       PDU_HEADER_LENGTH);
 701
 702                CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
 703                                "pdu header and data for up to 32 bytes:\n",
 704                                __func__, dev->name, skb->len);
 705                CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 706
 707                skb_queue_tail(&ch->collect_queue, skb);
 708                ch->collect_len += skb->len;
 709                kfree(p_header);
 710
 711                spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 712                        goto done;
 713        }
 714
 715        /*
 716         * Protect skb against beeing free'd by upper
 717         * layers.
 718         */
 719        atomic_inc(&skb->users);
 720
 721        /*
 722         * IDAL support in CTCM is broken, so we have to
 723         * care about skb's above 2G ourselves.
 724         */
 725        hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
 726        if (hi) {
 727                nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
 728                if (!nskb) {
 729                        goto nomem_exit;
 730                } else {
 731                        memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
 732                        atomic_inc(&nskb->users);
 733                        atomic_dec(&skb->users);
 734                        dev_kfree_skb_irq(skb);
 735                        skb = nskb;
 736                }
 737        }
 738
 739        p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
 740
 741        if (!p_header)
 742                goto nomem_exit;
 743
 744        p_header->pdu_offset = skb->len;
 745        p_header->pdu_proto = 0x01;
 746        p_header->pdu_flag = 0x00;
 747        p_header->pdu_seq = 0;
 748        if (skb->protocol == ntohs(ETH_P_SNAP)) {
 749                p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
 750        } else {
 751                p_header->pdu_flag |= PDU_FIRST;
 752        }
 753        memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
 754
 755        kfree(p_header);
 756
 757        if (ch->collect_len > 0) {
 758                spin_lock_irqsave(&ch->collect_lock, saveflags);
 759                skb_queue_tail(&ch->collect_queue, skb);
 760                ch->collect_len += skb->len;
 761                skb = skb_dequeue(&ch->collect_queue);
 762                ch->collect_len -= skb->len;
 763                spin_unlock_irqrestore(&ch->collect_lock, saveflags);
 764        }
 765
 766        p_header = (struct pdu *)skb->data;
 767        p_header->pdu_flag |= PDU_LAST;
 768
 769        ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
 770
 771        header = kmalloc(TH_HEADER_LENGTH, gfp_type());
 772        if (!header)
 773                goto nomem_exit;
 774
 775        header->th_seg = 0x00;
 776        header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
 777        header->th_blk_flag = 0x00;
 778        header->th_is_xid = 0x00;          /* Just data here */
 779        ch->th_seq_num++;
 780        header->th_seq_num = ch->th_seq_num;
 781
 782        CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
 783                       __func__, dev->name, ch->th_seq_num);
 784
 785        /* put the TH on the packet */
 786        memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
 787
 788        kfree(header);
 789
 790        CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
 791                        "up to 32 bytes sent to vtam:\n",
 792                                __func__, dev->name, skb->len);
 793        CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 794
 795        ch->ccw[4].count = skb->len;
 796        if (set_normalized_cda(&ch->ccw[4], skb->data)) {
 797                /*
 798                 * idal allocation failed, try via copying to trans_skb.
 799                 * trans_skb usually has a pre-allocated idal.
 800                 */
 801                if (ctcm_checkalloc_buffer(ch)) {
 802                        /*
 803                         * Remove our header.
 804                         * It gets added again on retransmit.
 805                         */
 806                                goto nomem_exit;
 807                }
 808
 809                skb_reset_tail_pointer(ch->trans_skb);
 810                ch->trans_skb->len = 0;
 811                ch->ccw[1].count = skb->len;
 812                memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
 813                atomic_dec(&skb->users);
 814                dev_kfree_skb_irq(skb);
 815                ccw_idx = 0;
 816                CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
 817                                "up to 32 bytes sent to vtam:\n",
 818                                __func__, dev->name, ch->trans_skb->len);
 819                CTCM_D3_DUMP((char *)ch->trans_skb->data,
 820                                min_t(int, 32, ch->trans_skb->len));
 821        } else {
 822                skb_queue_tail(&ch->io_queue, skb);
 823                ccw_idx = 3;
 824        }
 825        ch->retry = 0;
 826        fsm_newstate(ch->fsm, CTC_STATE_TX);
 827        fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
 828
 829        if (do_debug_ccw)
 830                ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
 831                                        sizeof(struct ccw1) * 3);
 832
 833        spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
 834        ch->prof.send_stamp = jiffies;
 835        rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
 836                                        (unsigned long)ch, 0xff, 0);
 837        spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
 838        if (ccw_idx == 3)
 839                ch->prof.doios_single++;
 840        if (rc != 0) {
 841                fsm_deltimer(&ch->timer);
 842                ctcm_ccw_check_rc(ch, rc, "single skb TX");
 843                if (ccw_idx == 3)
 844                        skb_dequeue_tail(&ch->io_queue);
 845        } else if (ccw_idx == 0) {
 846                priv->stats.tx_packets++;
 847                priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
 848        }
 849        if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
 850                ctcmpc_send_sweep_req(ch);
 851
 852        goto done;
 853nomem_exit:
 854        CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
 855                        "%s(%s): MEMORY allocation ERROR\n",
 856                        CTCM_FUNTAIL, ch->id);
 857        rc = -ENOMEM;
 858        atomic_dec(&skb->users);
 859        dev_kfree_skb_any(skb);
 860        fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
 861done:
 862        CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
 863        return rc;
 864}
 865
 866/**
 867 * Start transmission of a packet.
 868 * Called from generic network device layer.
 869 *
 870 *  skb         Pointer to buffer containing the packet.
 871 *  dev         Pointer to interface struct.
 872 *
 873 * returns 0 if packet consumed, !0 if packet rejected.
 874 *         Note: If we return !0, then the packet is free'd by
 875 *               the generic network layer.
 876 */
 877/* first merge version - leaving both functions separated */
 878static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
 879{
 880        struct ctcm_priv *priv = dev->ml_priv;
 881
 882        if (skb == NULL) {
 883                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 884                                "%s(%s): NULL sk_buff passed",
 885                                        CTCM_FUNTAIL, dev->name);
 886                priv->stats.tx_dropped++;
 887                return NETDEV_TX_OK;
 888        }
 889        if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
 890                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
 891                        "%s(%s): Got sk_buff with head room < %ld bytes",
 892                        CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
 893                dev_kfree_skb(skb);
 894                priv->stats.tx_dropped++;
 895                return NETDEV_TX_OK;
 896        }
 897
 898        /*
 899         * If channels are not running, try to restart them
 900         * and throw away packet.
 901         */
 902        if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
 903                fsm_event(priv->fsm, DEV_EVENT_START, dev);
 904                dev_kfree_skb(skb);
 905                priv->stats.tx_dropped++;
 906                priv->stats.tx_errors++;
 907                priv->stats.tx_carrier_errors++;
 908                return NETDEV_TX_OK;
 909        }
 910
 911        if (ctcm_test_and_set_busy(dev))
 912                return NETDEV_TX_BUSY;
 913
 914        netif_trans_update(dev);
 915        if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
 916                return NETDEV_TX_BUSY;
 917        return NETDEV_TX_OK;
 918}
 919
 920/* unmerged MPC variant of ctcm_tx */
 921static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
 922{
 923        int len = 0;
 924        struct ctcm_priv *priv = dev->ml_priv;
 925        struct mpc_group *grp  = priv->mpcg;
 926        struct sk_buff *newskb = NULL;
 927
 928        /*
 929         * Some sanity checks ...
 930         */
 931        if (skb == NULL) {
 932                CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 933                        "%s(%s): NULL sk_buff passed",
 934                                        CTCM_FUNTAIL, dev->name);
 935                priv->stats.tx_dropped++;
 936                                        goto done;
 937        }
 938        if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
 939                CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 940                        "%s(%s): Got sk_buff with head room < %ld bytes",
 941                        CTCM_FUNTAIL, dev->name,
 942                                TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 943
 944                CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
 945
 946                len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
 947                newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
 948
 949                if (!newskb) {
 950                        CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
 951                                "%s: %s: __dev_alloc_skb failed",
 952                                                __func__, dev->name);
 953
 954                        dev_kfree_skb_any(skb);
 955                        priv->stats.tx_dropped++;
 956                        priv->stats.tx_errors++;
 957                        priv->stats.tx_carrier_errors++;
 958                        fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 959                                        goto done;
 960                }
 961                newskb->protocol = skb->protocol;
 962                skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
 963                memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
 964                dev_kfree_skb_any(skb);
 965                skb = newskb;
 966        }
 967
 968        /*
 969         * If channels are not running,
 970         * notify anybody about a link failure and throw
 971         * away packet.
 972         */
 973        if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
 974           (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
 975                dev_kfree_skb_any(skb);
 976                CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 977                        "%s(%s): inactive MPCGROUP - dropped",
 978                                        CTCM_FUNTAIL, dev->name);
 979                priv->stats.tx_dropped++;
 980                priv->stats.tx_errors++;
 981                priv->stats.tx_carrier_errors++;
 982                                        goto done;
 983        }
 984
 985        if (ctcm_test_and_set_busy(dev)) {
 986                CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
 987                        "%s(%s): device busy - dropped",
 988                                        CTCM_FUNTAIL, dev->name);
 989                dev_kfree_skb_any(skb);
 990                priv->stats.tx_dropped++;
 991                priv->stats.tx_errors++;
 992                priv->stats.tx_carrier_errors++;
 993                fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
 994                                        goto done;
 995        }
 996
 997        netif_trans_update(dev);
 998        if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
 999                CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000                        "%s(%s): device error - dropped",
1001                                        CTCM_FUNTAIL, dev->name);
1002                dev_kfree_skb_any(skb);
1003                priv->stats.tx_dropped++;
1004                priv->stats.tx_errors++;
1005                priv->stats.tx_carrier_errors++;
1006                ctcm_clear_busy(dev);
1007                fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008                                        goto done;
1009        }
1010        ctcm_clear_busy(dev);
1011done:
1012        if (do_debug)
1013                MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
1015        return NETDEV_TX_OK;    /* handle freeing of skb here */
1016}
1017
1018
1019/**
1020 * Sets MTU of an interface.
1021 *
1022 *  dev         Pointer to interface struct.
1023 *  new_mtu     The new MTU to use for this interface.
1024 *
1025 * returns 0 on success, -EINVAL if MTU is out of valid range.
1026 *         (valid range is 576 .. 65527). If VM is on the
1027 *         remote side, maximum MTU is 32760, however this is
1028 *         not checked here.
1029 */
1030static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031{
1032        struct ctcm_priv *priv;
1033        int max_bufsize;
1034
1035        priv = dev->ml_priv;
1036        max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1037
1038        if (IS_MPC(priv)) {
1039                if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1040                        return -EINVAL;
1041                dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1042        } else {
1043                if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1044                        return -EINVAL;
1045                dev->hard_header_len = LL_HEADER_LENGTH + 2;
1046        }
1047        dev->mtu = new_mtu;
1048        return 0;
1049}
1050
1051/**
1052 * Returns interface statistics of a device.
1053 *
1054 *  dev         Pointer to interface struct.
1055 *
1056 * returns Pointer to stats struct of this interface.
1057 */
1058static struct net_device_stats *ctcm_stats(struct net_device *dev)
1059{
1060        return &((struct ctcm_priv *)dev->ml_priv)->stats;
1061}
1062
1063static void ctcm_free_netdevice(struct net_device *dev)
1064{
1065        struct ctcm_priv *priv;
1066        struct mpc_group *grp;
1067
1068        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1069                        "%s(%s)", CTCM_FUNTAIL, dev->name);
1070        priv = dev->ml_priv;
1071        if (priv) {
1072                grp = priv->mpcg;
1073                if (grp) {
1074                        if (grp->fsm)
1075                                kfree_fsm(grp->fsm);
1076                        if (grp->xid_skb)
1077                                dev_kfree_skb(grp->xid_skb);
1078                        if (grp->rcvd_xid_skb)
1079                                dev_kfree_skb(grp->rcvd_xid_skb);
1080                        tasklet_kill(&grp->mpc_tasklet2);
1081                        kfree(grp);
1082                        priv->mpcg = NULL;
1083                }
1084                if (priv->fsm) {
1085                        kfree_fsm(priv->fsm);
1086                        priv->fsm = NULL;
1087                }
1088                kfree(priv->xid);
1089                priv->xid = NULL;
1090        /*
1091         * Note: kfree(priv); is done in "opposite" function of
1092         * allocator function probe_device which is remove_device.
1093         */
1094        }
1095#ifdef MODULE
1096        free_netdev(dev);
1097#endif
1098}
1099
1100struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1101
1102static const struct net_device_ops ctcm_netdev_ops = {
1103        .ndo_open               = ctcm_open,
1104        .ndo_stop               = ctcm_close,
1105        .ndo_get_stats          = ctcm_stats,
1106        .ndo_change_mtu         = ctcm_change_mtu,
1107        .ndo_start_xmit         = ctcm_tx,
1108};
1109
1110static const struct net_device_ops ctcm_mpc_netdev_ops = {
1111        .ndo_open               = ctcm_open,
1112        .ndo_stop               = ctcm_close,
1113        .ndo_get_stats          = ctcm_stats,
1114        .ndo_change_mtu         = ctcm_change_mtu,
1115        .ndo_start_xmit         = ctcmpc_tx,
1116};
1117
1118void static ctcm_dev_setup(struct net_device *dev)
1119{
1120        dev->type = ARPHRD_SLIP;
1121        dev->tx_queue_len = 100;
1122        dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1123        dev->min_mtu = 576;
1124        dev->max_mtu = 65527;
1125}
1126
1127/*
1128 * Initialize everything of the net device except the name and the
1129 * channel structs.
1130 */
1131static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1132{
1133        struct net_device *dev;
1134        struct mpc_group *grp;
1135        if (!priv)
1136                return NULL;
1137
1138        if (IS_MPC(priv))
1139                dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1140                                   ctcm_dev_setup);
1141        else
1142                dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1143                                   ctcm_dev_setup);
1144
1145        if (!dev) {
1146                CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1147                        "%s: MEMORY allocation ERROR",
1148                        CTCM_FUNTAIL);
1149                return NULL;
1150        }
1151        dev->ml_priv = priv;
1152        priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1153                                CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1154                                dev_fsm, dev_fsm_len, GFP_KERNEL);
1155        if (priv->fsm == NULL) {
1156                CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1157                free_netdev(dev);
1158                return NULL;
1159        }
1160        fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1161        fsm_settimer(priv->fsm, &priv->restart_timer);
1162
1163        if (IS_MPC(priv)) {
1164                /*  MPC Group Initializations  */
1165                grp = ctcmpc_init_mpc_group(priv);
1166                if (grp == NULL) {
1167                        MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1168                        free_netdev(dev);
1169                        return NULL;
1170                }
1171                tasklet_init(&grp->mpc_tasklet2,
1172                                mpc_group_ready, (unsigned long)dev);
1173                dev->mtu = MPC_BUFSIZE_DEFAULT -
1174                                TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1175
1176                dev->netdev_ops = &ctcm_mpc_netdev_ops;
1177                dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1178                priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1179        } else {
1180                dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1181                dev->netdev_ops = &ctcm_netdev_ops;
1182                dev->hard_header_len = LL_HEADER_LENGTH + 2;
1183        }
1184
1185        CTCMY_DBF_DEV(SETUP, dev, "finished");
1186
1187        return dev;
1188}
1189
1190/**
1191 * Main IRQ handler.
1192 *
1193 *  cdev        The ccw_device the interrupt is for.
1194 *  intparm     interruption parameter.
1195 *  irb         interruption response block.
1196 */
1197static void ctcm_irq_handler(struct ccw_device *cdev,
1198                                unsigned long intparm, struct irb *irb)
1199{
1200        struct channel          *ch;
1201        struct net_device       *dev;
1202        struct ctcm_priv        *priv;
1203        struct ccwgroup_device  *cgdev;
1204        int cstat;
1205        int dstat;
1206
1207        CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1208                "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1209
1210        if (ctcm_check_irb_error(cdev, irb))
1211                return;
1212
1213        cgdev = dev_get_drvdata(&cdev->dev);
1214
1215        cstat = irb->scsw.cmd.cstat;
1216        dstat = irb->scsw.cmd.dstat;
1217
1218        /* Check for unsolicited interrupts. */
1219        if (cgdev == NULL) {
1220                CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1221                        "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1222                        CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1223                dev_warn(&cdev->dev,
1224                        "The adapter received a non-specific IRQ\n");
1225                return;
1226        }
1227
1228        priv = dev_get_drvdata(&cgdev->dev);
1229
1230        /* Try to extract channel from driver data. */
1231        if (priv->channel[CTCM_READ]->cdev == cdev)
1232                ch = priv->channel[CTCM_READ];
1233        else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1234                ch = priv->channel[CTCM_WRITE];
1235        else {
1236                dev_err(&cdev->dev,
1237                        "%s: Internal error: Can't determine channel for "
1238                        "interrupt device %s\n",
1239                        __func__, dev_name(&cdev->dev));
1240                        /* Explain: inconsistent internal structures */
1241                return;
1242        }
1243
1244        dev = ch->netdev;
1245        if (dev == NULL) {
1246                dev_err(&cdev->dev,
1247                        "%s Internal error: net_device is NULL, ch = 0x%p\n",
1248                        __func__, ch);
1249                        /* Explain: inconsistent internal structures */
1250                return;
1251        }
1252
1253        /* Copy interruption response block. */
1254        memcpy(ch->irb, irb, sizeof(struct irb));
1255
1256        /* Issue error message and return on subchannel error code */
1257        if (irb->scsw.cmd.cstat) {
1258                fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1259                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1260                        "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1261                                CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1262                dev_warn(&cdev->dev,
1263                                "A check occurred on the subchannel\n");
1264                return;
1265        }
1266
1267        /* Check the reason-code of a unit check */
1268        if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1269                if ((irb->ecw[0] & ch->sense_rc) == 0)
1270                        /* print it only once */
1271                        CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1272                                "%s(%s): sense=%02x, ds=%02x",
1273                                CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1274                ccw_unit_check(ch, irb->ecw[0]);
1275                return;
1276        }
1277        if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1278                if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1279                        fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1280                else
1281                        fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1282                return;
1283        }
1284        if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1285                fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1286                return;
1287        }
1288        if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1289            (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1290            (irb->scsw.cmd.stctl ==
1291             (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1292                fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1293        else
1294                fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1295
1296}
1297
1298static const struct device_type ctcm_devtype = {
1299        .name = "ctcm",
1300        .groups = ctcm_attr_groups,
1301};
1302
1303/**
1304 * Add ctcm specific attributes.
1305 * Add ctcm private data.
1306 *
1307 *  cgdev       pointer to ccwgroup_device just added
1308 *
1309 * returns 0 on success, !0 on failure.
1310 */
1311static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1312{
1313        struct ctcm_priv *priv;
1314
1315        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1316                        "%s %p",
1317                        __func__, cgdev);
1318
1319        if (!get_device(&cgdev->dev))
1320                return -ENODEV;
1321
1322        priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1323        if (!priv) {
1324                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1325                        "%s: memory allocation failure",
1326                        CTCM_FUNTAIL);
1327                put_device(&cgdev->dev);
1328                return -ENOMEM;
1329        }
1330        priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1331        cgdev->cdev[0]->handler = ctcm_irq_handler;
1332        cgdev->cdev[1]->handler = ctcm_irq_handler;
1333        dev_set_drvdata(&cgdev->dev, priv);
1334        cgdev->dev.type = &ctcm_devtype;
1335
1336        return 0;
1337}
1338
1339/**
1340 * Add a new channel to the list of channels.
1341 * Keeps the channel list sorted.
1342 *
1343 *  cdev        The ccw_device to be added.
1344 *  type        The type class of the new channel.
1345 *  priv        Points to the private data of the ccwgroup_device.
1346 *
1347 * returns 0 on success, !0 on error.
1348 */
1349static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1350                                struct ctcm_priv *priv)
1351{
1352        struct channel **c = &channels;
1353        struct channel *ch;
1354        int ccw_num;
1355        int rc = 0;
1356
1357        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1358                "%s(%s), type %d, proto %d",
1359                        __func__, dev_name(&cdev->dev), type, priv->protocol);
1360
1361        ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1362        if (ch == NULL)
1363                return -ENOMEM;
1364
1365        ch->protocol = priv->protocol;
1366        if (IS_MPC(priv)) {
1367                ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1368                if (ch->discontact_th == NULL)
1369                                        goto nomem_return;
1370
1371                ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1372                tasklet_init(&ch->ch_disc_tasklet,
1373                        mpc_action_send_discontact, (unsigned long)ch);
1374
1375                tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1376                ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1377                ccw_num = 17;
1378        } else
1379                ccw_num = 8;
1380
1381        ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1382        if (ch->ccw == NULL)
1383                                        goto nomem_return;
1384
1385        ch->cdev = cdev;
1386        snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1387        ch->type = type;
1388
1389        /**
1390         * "static" ccws are used in the following way:
1391         *
1392         * ccw[0..2] (Channel program for generic I/O):
1393         *           0: prepare
1394         *           1: read or write (depending on direction) with fixed
1395         *              buffer (idal allocated once when buffer is allocated)
1396         *           2: nop
1397         * ccw[3..5] (Channel program for direct write of packets)
1398         *           3: prepare
1399         *           4: write (idal allocated on every write).
1400         *           5: nop
1401         * ccw[6..7] (Channel program for initial channel setup):
1402         *           6: set extended mode
1403         *           7: nop
1404         *
1405         * ch->ccw[0..5] are initialized in ch_action_start because
1406         * the channel's direction is yet unknown here.
1407         *
1408         * ccws used for xid2 negotiations
1409         *  ch-ccw[8-14] need to be used for the XID exchange either
1410         *    X side XID2 Processing
1411         *       8:  write control
1412         *       9:  write th
1413         *           10: write XID
1414         *           11: read th from secondary
1415         *           12: read XID   from secondary
1416         *           13: read 4 byte ID
1417         *           14: nop
1418         *    Y side XID Processing
1419         *           8:  sense
1420         *       9:  read th
1421         *           10: read XID
1422         *           11: write th
1423         *           12: write XID
1424         *           13: write 4 byte ID
1425         *           14: nop
1426         *
1427         *  ccws used for double noop due to VM timing issues
1428         *  which result in unrecoverable Busy on channel
1429         *       15: nop
1430         *       16: nop
1431         */
1432        ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1433        ch->ccw[6].flags        = CCW_FLAG_SLI;
1434
1435        ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1436        ch->ccw[7].flags        = CCW_FLAG_SLI;
1437
1438        if (IS_MPC(priv)) {
1439                ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1440                ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1441                ch->ccw[15].count    = TH_HEADER_LENGTH;
1442                ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1443
1444                ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1445                ch->ccw[16].flags    = CCW_FLAG_SLI;
1446
1447                ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1448                                ctc_ch_event_names, CTC_MPC_NR_STATES,
1449                                CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1450                                mpc_ch_fsm_len, GFP_KERNEL);
1451        } else {
1452                ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1453                                ctc_ch_event_names, CTC_NR_STATES,
1454                                CTC_NR_EVENTS, ch_fsm,
1455                                ch_fsm_len, GFP_KERNEL);
1456        }
1457        if (ch->fsm == NULL)
1458                                goto nomem_return;
1459
1460        fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1461
1462        ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1463        if (ch->irb == NULL)
1464                                goto nomem_return;
1465
1466        while (*c && ctcm_less_than((*c)->id, ch->id))
1467                c = &(*c)->next;
1468
1469        if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1470                CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1471                                "%s (%s) already in list, using old entry",
1472                                __func__, (*c)->id);
1473
1474                                goto free_return;
1475        }
1476
1477        spin_lock_init(&ch->collect_lock);
1478
1479        fsm_settimer(ch->fsm, &ch->timer);
1480        skb_queue_head_init(&ch->io_queue);
1481        skb_queue_head_init(&ch->collect_queue);
1482
1483        if (IS_MPC(priv)) {
1484                fsm_settimer(ch->fsm, &ch->sweep_timer);
1485                skb_queue_head_init(&ch->sweep_queue);
1486        }
1487        ch->next = *c;
1488        *c = ch;
1489        return 0;
1490
1491nomem_return:
1492        rc = -ENOMEM;
1493
1494free_return:    /* note that all channel pointers are 0 or valid */
1495        kfree(ch->ccw);
1496        kfree(ch->discontact_th);
1497        kfree_fsm(ch->fsm);
1498        kfree(ch->irb);
1499        kfree(ch);
1500        return rc;
1501}
1502
1503/*
1504 * Return type of a detected device.
1505 */
1506static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1507{
1508        enum ctcm_channel_types type;
1509        type = (enum ctcm_channel_types)id->driver_info;
1510
1511        if (type == ctcm_channel_type_ficon)
1512                type = ctcm_channel_type_escon;
1513
1514        return type;
1515}
1516
1517/**
1518 *
1519 * Setup an interface.
1520 *
1521 *  cgdev       Device to be setup.
1522 *
1523 * returns 0 on success, !0 on failure.
1524 */
1525static int ctcm_new_device(struct ccwgroup_device *cgdev)
1526{
1527        char read_id[CTCM_ID_SIZE];
1528        char write_id[CTCM_ID_SIZE];
1529        int direction;
1530        enum ctcm_channel_types type;
1531        struct ctcm_priv *priv;
1532        struct net_device *dev;
1533        struct ccw_device *cdev0;
1534        struct ccw_device *cdev1;
1535        struct channel *readc;
1536        struct channel *writec;
1537        int ret;
1538        int result;
1539
1540        priv = dev_get_drvdata(&cgdev->dev);
1541        if (!priv) {
1542                result = -ENODEV;
1543                goto out_err_result;
1544        }
1545
1546        cdev0 = cgdev->cdev[0];
1547        cdev1 = cgdev->cdev[1];
1548
1549        type = get_channel_type(&cdev0->id);
1550
1551        snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1552        snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1553
1554        ret = add_channel(cdev0, type, priv);
1555        if (ret) {
1556                result = ret;
1557                goto out_err_result;
1558        }
1559        ret = add_channel(cdev1, type, priv);
1560        if (ret) {
1561                result = ret;
1562                goto out_remove_channel1;
1563        }
1564
1565        ret = ccw_device_set_online(cdev0);
1566        if (ret != 0) {
1567                CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1568                        "%s(%s) set_online rc=%d",
1569                                CTCM_FUNTAIL, read_id, ret);
1570                result = -EIO;
1571                goto out_remove_channel2;
1572        }
1573
1574        ret = ccw_device_set_online(cdev1);
1575        if (ret != 0) {
1576                CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1577                        "%s(%s) set_online rc=%d",
1578                                CTCM_FUNTAIL, write_id, ret);
1579
1580                result = -EIO;
1581                goto out_ccw1;
1582        }
1583
1584        dev = ctcm_init_netdevice(priv);
1585        if (dev == NULL) {
1586                result = -ENODEV;
1587                goto out_ccw2;
1588        }
1589
1590        for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1591                priv->channel[direction] =
1592                        channel_get(type, direction == CTCM_READ ?
1593                                read_id : write_id, direction);
1594                if (priv->channel[direction] == NULL) {
1595                        if (direction == CTCM_WRITE)
1596                                channel_free(priv->channel[CTCM_READ]);
1597                        goto out_dev;
1598                }
1599                priv->channel[direction]->netdev = dev;
1600                priv->channel[direction]->protocol = priv->protocol;
1601                priv->channel[direction]->max_bufsize = priv->buffer_size;
1602        }
1603        /* sysfs magic */
1604        SET_NETDEV_DEV(dev, &cgdev->dev);
1605
1606        if (register_netdev(dev)) {
1607                result = -ENODEV;
1608                goto out_dev;
1609        }
1610
1611        strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1612
1613        dev_info(&dev->dev,
1614                "setup OK : r/w = %s/%s, protocol : %d\n",
1615                        priv->channel[CTCM_READ]->id,
1616                        priv->channel[CTCM_WRITE]->id, priv->protocol);
1617
1618        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1619                "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1620                        priv->channel[CTCM_READ]->id,
1621                        priv->channel[CTCM_WRITE]->id, priv->protocol);
1622
1623        return 0;
1624out_dev:
1625        ctcm_free_netdevice(dev);
1626out_ccw2:
1627        ccw_device_set_offline(cgdev->cdev[1]);
1628out_ccw1:
1629        ccw_device_set_offline(cgdev->cdev[0]);
1630out_remove_channel2:
1631        readc = channel_get(type, read_id, CTCM_READ);
1632        channel_remove(readc);
1633out_remove_channel1:
1634        writec = channel_get(type, write_id, CTCM_WRITE);
1635        channel_remove(writec);
1636out_err_result:
1637        return result;
1638}
1639
1640/**
1641 * Shutdown an interface.
1642 *
1643 *  cgdev       Device to be shut down.
1644 *
1645 * returns 0 on success, !0 on failure.
1646 */
1647static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1648{
1649        struct ctcm_priv *priv;
1650        struct net_device *dev;
1651
1652        priv = dev_get_drvdata(&cgdev->dev);
1653        if (!priv)
1654                return -ENODEV;
1655
1656        if (priv->channel[CTCM_READ]) {
1657                dev = priv->channel[CTCM_READ]->netdev;
1658                CTCM_DBF_DEV(SETUP, dev, "");
1659                /* Close the device */
1660                ctcm_close(dev);
1661                dev->flags &= ~IFF_RUNNING;
1662                channel_free(priv->channel[CTCM_READ]);
1663        } else
1664                dev = NULL;
1665
1666        if (priv->channel[CTCM_WRITE])
1667                channel_free(priv->channel[CTCM_WRITE]);
1668
1669        if (dev) {
1670                unregister_netdev(dev);
1671                ctcm_free_netdevice(dev);
1672        }
1673
1674        if (priv->fsm)
1675                kfree_fsm(priv->fsm);
1676
1677        ccw_device_set_offline(cgdev->cdev[1]);
1678        ccw_device_set_offline(cgdev->cdev[0]);
1679        channel_remove(priv->channel[CTCM_READ]);
1680        channel_remove(priv->channel[CTCM_WRITE]);
1681        priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1682
1683        return 0;
1684
1685}
1686
1687
1688static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1689{
1690        struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1691
1692        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1693                        "removing device %p, proto : %d",
1694                        cgdev, priv->protocol);
1695
1696        if (cgdev->state == CCWGROUP_ONLINE)
1697                ctcm_shutdown_device(cgdev);
1698        dev_set_drvdata(&cgdev->dev, NULL);
1699        kfree(priv);
1700        put_device(&cgdev->dev);
1701}
1702
1703static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1704{
1705        struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1706
1707        if (gdev->state == CCWGROUP_OFFLINE)
1708                return 0;
1709        netif_device_detach(priv->channel[CTCM_READ]->netdev);
1710        ctcm_close(priv->channel[CTCM_READ]->netdev);
1711        if (!wait_event_timeout(priv->fsm->wait_q,
1712            fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1713                netif_device_attach(priv->channel[CTCM_READ]->netdev);
1714                return -EBUSY;
1715        }
1716        ccw_device_set_offline(gdev->cdev[1]);
1717        ccw_device_set_offline(gdev->cdev[0]);
1718        return 0;
1719}
1720
1721static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1722{
1723        struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1724        int rc;
1725
1726        if (gdev->state == CCWGROUP_OFFLINE)
1727                return 0;
1728        rc = ccw_device_set_online(gdev->cdev[1]);
1729        if (rc)
1730                goto err_out;
1731        rc = ccw_device_set_online(gdev->cdev[0]);
1732        if (rc)
1733                goto err_out;
1734        ctcm_open(priv->channel[CTCM_READ]->netdev);
1735err_out:
1736        netif_device_attach(priv->channel[CTCM_READ]->netdev);
1737        return rc;
1738}
1739
1740static struct ccw_device_id ctcm_ids[] = {
1741        {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1742        {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1743        {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1744        {},
1745};
1746MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1747
1748static struct ccw_driver ctcm_ccw_driver = {
1749        .driver = {
1750                .owner  = THIS_MODULE,
1751                .name   = "ctcm",
1752        },
1753        .ids    = ctcm_ids,
1754        .probe  = ccwgroup_probe_ccwdev,
1755        .remove = ccwgroup_remove_ccwdev,
1756        .int_class = IRQIO_CTC,
1757};
1758
1759static struct ccwgroup_driver ctcm_group_driver = {
1760        .driver = {
1761                .owner  = THIS_MODULE,
1762                .name   = CTC_DRIVER_NAME,
1763        },
1764        .setup       = ctcm_probe_device,
1765        .remove      = ctcm_remove_device,
1766        .set_online  = ctcm_new_device,
1767        .set_offline = ctcm_shutdown_device,
1768        .freeze      = ctcm_pm_suspend,
1769        .thaw        = ctcm_pm_resume,
1770        .restore     = ctcm_pm_resume,
1771};
1772
1773static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1774                                       const char *buf, size_t count)
1775{
1776        int err;
1777
1778        err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1779        return err ? err : count;
1780}
1781static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1782
1783static struct attribute *ctcm_drv_attrs[] = {
1784        &driver_attr_group.attr,
1785        NULL,
1786};
1787static struct attribute_group ctcm_drv_attr_group = {
1788        .attrs = ctcm_drv_attrs,
1789};
1790static const struct attribute_group *ctcm_drv_attr_groups[] = {
1791        &ctcm_drv_attr_group,
1792        NULL,
1793};
1794
1795/*
1796 * Module related routines
1797 */
1798
1799/*
1800 * Prepare to be unloaded. Free IRQ's and release all resources.
1801 * This is called just before this module is unloaded. It is
1802 * not called, if the usage count is !0, so we don't need to check
1803 * for that.
1804 */
1805static void __exit ctcm_exit(void)
1806{
1807        ccwgroup_driver_unregister(&ctcm_group_driver);
1808        ccw_driver_unregister(&ctcm_ccw_driver);
1809        root_device_unregister(ctcm_root_dev);
1810        ctcm_unregister_dbf_views();
1811        pr_info("CTCM driver unloaded\n");
1812}
1813
1814/*
1815 * Print Banner.
1816 */
1817static void print_banner(void)
1818{
1819        pr_info("CTCM driver initialized\n");
1820}
1821
1822/**
1823 * Initialize module.
1824 * This is called just after the module is loaded.
1825 *
1826 * returns 0 on success, !0 on error.
1827 */
1828static int __init ctcm_init(void)
1829{
1830        int ret;
1831
1832        channels = NULL;
1833
1834        ret = ctcm_register_dbf_views();
1835        if (ret)
1836                goto out_err;
1837        ctcm_root_dev = root_device_register("ctcm");
1838        ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1839        if (ret)
1840                goto register_err;
1841        ret = ccw_driver_register(&ctcm_ccw_driver);
1842        if (ret)
1843                goto ccw_err;
1844        ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1845        ret = ccwgroup_driver_register(&ctcm_group_driver);
1846        if (ret)
1847                goto ccwgroup_err;
1848        print_banner();
1849        return 0;
1850
1851ccwgroup_err:
1852        ccw_driver_unregister(&ctcm_ccw_driver);
1853ccw_err:
1854        root_device_unregister(ctcm_root_dev);
1855register_err:
1856        ctcm_unregister_dbf_views();
1857out_err:
1858        pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1859                __func__, ret);
1860        return ret;
1861}
1862
1863module_init(ctcm_init);
1864module_exit(ctcm_exit);
1865
1866MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1867MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1868MODULE_LICENSE("GPL");
1869
1870
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