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 = current_kernel_time(); /* xtime */
 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        dev->trans_start = jiffies;
 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 = current_kernel_time(); /* xtime */
 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        dev->trans_start = jiffies;
 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        dev->trans_start = jiffies;
 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        if (new_mtu < 576 || new_mtu > 65527)
1036                return -EINVAL;
1037
1038        priv = dev->ml_priv;
1039        max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1040
1041        if (IS_MPC(priv)) {
1042                if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043                        return -EINVAL;
1044                dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045        } else {
1046                if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047                        return -EINVAL;
1048                dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049        }
1050        dev->mtu = new_mtu;
1051        return 0;
1052}
1053
1054/**
1055 * Returns interface statistics of a device.
1056 *
1057 *  dev         Pointer to interface struct.
1058 *
1059 * returns Pointer to stats struct of this interface.
1060 */
1061static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062{
1063        return &((struct ctcm_priv *)dev->ml_priv)->stats;
1064}
1065
1066static void ctcm_free_netdevice(struct net_device *dev)
1067{
1068        struct ctcm_priv *priv;
1069        struct mpc_group *grp;
1070
1071        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072                        "%s(%s)", CTCM_FUNTAIL, dev->name);
1073        priv = dev->ml_priv;
1074        if (priv) {
1075                grp = priv->mpcg;
1076                if (grp) {
1077                        if (grp->fsm)
1078                                kfree_fsm(grp->fsm);
1079                        if (grp->xid_skb)
1080                                dev_kfree_skb(grp->xid_skb);
1081                        if (grp->rcvd_xid_skb)
1082                                dev_kfree_skb(grp->rcvd_xid_skb);
1083                        tasklet_kill(&grp->mpc_tasklet2);
1084                        kfree(grp);
1085                        priv->mpcg = NULL;
1086                }
1087                if (priv->fsm) {
1088                        kfree_fsm(priv->fsm);
1089                        priv->fsm = NULL;
1090                }
1091                kfree(priv->xid);
1092                priv->xid = NULL;
1093        /*
1094         * Note: kfree(priv); is done in "opposite" function of
1095         * allocator function probe_device which is remove_device.
1096         */
1097        }
1098#ifdef MODULE
1099        free_netdev(dev);
1100#endif
1101}
1102
1103struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
1105static const struct net_device_ops ctcm_netdev_ops = {
1106        .ndo_open               = ctcm_open,
1107        .ndo_stop               = ctcm_close,
1108        .ndo_get_stats          = ctcm_stats,
1109        .ndo_change_mtu         = ctcm_change_mtu,
1110        .ndo_start_xmit         = ctcm_tx,
1111};
1112
1113static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114        .ndo_open               = ctcm_open,
1115        .ndo_stop               = ctcm_close,
1116        .ndo_get_stats          = ctcm_stats,
1117        .ndo_change_mtu         = ctcm_change_mtu,
1118        .ndo_start_xmit         = ctcmpc_tx,
1119};
1120
1121void static ctcm_dev_setup(struct net_device *dev)
1122{
1123        dev->type = ARPHRD_SLIP;
1124        dev->tx_queue_len = 100;
1125        dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126}
1127
1128/*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133{
1134        struct net_device *dev;
1135        struct mpc_group *grp;
1136        if (!priv)
1137                return NULL;
1138
1139        if (IS_MPC(priv))
1140                dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1141                                   ctcm_dev_setup);
1142        else
1143                dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1144                                   ctcm_dev_setup);
1145
1146        if (!dev) {
1147                CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1148                        "%s: MEMORY allocation ERROR",
1149                        CTCM_FUNTAIL);
1150                return NULL;
1151        }
1152        dev->ml_priv = priv;
1153        priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1154                                CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1155                                dev_fsm, dev_fsm_len, GFP_KERNEL);
1156        if (priv->fsm == NULL) {
1157                CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1158                free_netdev(dev);
1159                return NULL;
1160        }
1161        fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1162        fsm_settimer(priv->fsm, &priv->restart_timer);
1163
1164        if (IS_MPC(priv)) {
1165                /*  MPC Group Initializations  */
1166                grp = ctcmpc_init_mpc_group(priv);
1167                if (grp == NULL) {
1168                        MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1169                        free_netdev(dev);
1170                        return NULL;
1171                }
1172                tasklet_init(&grp->mpc_tasklet2,
1173                                mpc_group_ready, (unsigned long)dev);
1174                dev->mtu = MPC_BUFSIZE_DEFAULT -
1175                                TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1176
1177                dev->netdev_ops = &ctcm_mpc_netdev_ops;
1178                dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1179                priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1180        } else {
1181                dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1182                dev->netdev_ops = &ctcm_netdev_ops;
1183                dev->hard_header_len = LL_HEADER_LENGTH + 2;
1184        }
1185
1186        CTCMY_DBF_DEV(SETUP, dev, "finished");
1187
1188        return dev;
1189}
1190
1191/**
1192 * Main IRQ handler.
1193 *
1194 *  cdev        The ccw_device the interrupt is for.
1195 *  intparm     interruption parameter.
1196 *  irb         interruption response block.
1197 */
1198static void ctcm_irq_handler(struct ccw_device *cdev,
1199                                unsigned long intparm, struct irb *irb)
1200{
1201        struct channel          *ch;
1202        struct net_device       *dev;
1203        struct ctcm_priv        *priv;
1204        struct ccwgroup_device  *cgdev;
1205        int cstat;
1206        int dstat;
1207
1208        CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1209                "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1210
1211        if (ctcm_check_irb_error(cdev, irb))
1212                return;
1213
1214        cgdev = dev_get_drvdata(&cdev->dev);
1215
1216        cstat = irb->scsw.cmd.cstat;
1217        dstat = irb->scsw.cmd.dstat;
1218
1219        /* Check for unsolicited interrupts. */
1220        if (cgdev == NULL) {
1221                CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1222                        "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1223                        CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1224                dev_warn(&cdev->dev,
1225                        "The adapter received a non-specific IRQ\n");
1226                return;
1227        }
1228
1229        priv = dev_get_drvdata(&cgdev->dev);
1230
1231        /* Try to extract channel from driver data. */
1232        if (priv->channel[CTCM_READ]->cdev == cdev)
1233                ch = priv->channel[CTCM_READ];
1234        else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1235                ch = priv->channel[CTCM_WRITE];
1236        else {
1237                dev_err(&cdev->dev,
1238                        "%s: Internal error: Can't determine channel for "
1239                        "interrupt device %s\n",
1240                        __func__, dev_name(&cdev->dev));
1241                        /* Explain: inconsistent internal structures */
1242                return;
1243        }
1244
1245        dev = ch->netdev;
1246        if (dev == NULL) {
1247                dev_err(&cdev->dev,
1248                        "%s Internal error: net_device is NULL, ch = 0x%p\n",
1249                        __func__, ch);
1250                        /* Explain: inconsistent internal structures */
1251                return;
1252        }
1253
1254        /* Copy interruption response block. */
1255        memcpy(ch->irb, irb, sizeof(struct irb));
1256
1257        /* Issue error message and return on subchannel error code */
1258        if (irb->scsw.cmd.cstat) {
1259                fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1260                CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1261                        "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1262                                CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1263                dev_warn(&cdev->dev,
1264                                "A check occurred on the subchannel\n");
1265                return;
1266        }
1267
1268        /* Check the reason-code of a unit check */
1269        if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1270                if ((irb->ecw[0] & ch->sense_rc) == 0)
1271                        /* print it only once */
1272                        CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1273                                "%s(%s): sense=%02x, ds=%02x",
1274                                CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1275                ccw_unit_check(ch, irb->ecw[0]);
1276                return;
1277        }
1278        if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1279                if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1280                        fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1281                else
1282                        fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1283                return;
1284        }
1285        if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1286                fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1287                return;
1288        }
1289        if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1290            (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1291            (irb->scsw.cmd.stctl ==
1292             (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1293                fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1294        else
1295                fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1296
1297}
1298
1299static const struct device_type ctcm_devtype = {
1300        .name = "ctcm",
1301        .groups = ctcm_attr_groups,
1302};
1303
1304/**
1305 * Add ctcm specific attributes.
1306 * Add ctcm private data.
1307 *
1308 *  cgdev       pointer to ccwgroup_device just added
1309 *
1310 * returns 0 on success, !0 on failure.
1311 */
1312static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1313{
1314        struct ctcm_priv *priv;
1315
1316        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1317                        "%s %p",
1318                        __func__, cgdev);
1319
1320        if (!get_device(&cgdev->dev))
1321                return -ENODEV;
1322
1323        priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1324        if (!priv) {
1325                CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1326                        "%s: memory allocation failure",
1327                        CTCM_FUNTAIL);
1328                put_device(&cgdev->dev);
1329                return -ENOMEM;
1330        }
1331        priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1332        cgdev->cdev[0]->handler = ctcm_irq_handler;
1333        cgdev->cdev[1]->handler = ctcm_irq_handler;
1334        dev_set_drvdata(&cgdev->dev, priv);
1335        cgdev->dev.type = &ctcm_devtype;
1336
1337        return 0;
1338}
1339
1340/**
1341 * Add a new channel to the list of channels.
1342 * Keeps the channel list sorted.
1343 *
1344 *  cdev        The ccw_device to be added.
1345 *  type        The type class of the new channel.
1346 *  priv        Points to the private data of the ccwgroup_device.
1347 *
1348 * returns 0 on success, !0 on error.
1349 */
1350static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1351                                struct ctcm_priv *priv)
1352{
1353        struct channel **c = &channels;
1354        struct channel *ch;
1355        int ccw_num;
1356        int rc = 0;
1357
1358        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1359                "%s(%s), type %d, proto %d",
1360                        __func__, dev_name(&cdev->dev), type, priv->protocol);
1361
1362        ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1363        if (ch == NULL)
1364                return -ENOMEM;
1365
1366        ch->protocol = priv->protocol;
1367        if (IS_MPC(priv)) {
1368                ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1369                if (ch->discontact_th == NULL)
1370                                        goto nomem_return;
1371
1372                ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1373                tasklet_init(&ch->ch_disc_tasklet,
1374                        mpc_action_send_discontact, (unsigned long)ch);
1375
1376                tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1377                ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1378                ccw_num = 17;
1379        } else
1380                ccw_num = 8;
1381
1382        ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1383        if (ch->ccw == NULL)
1384                                        goto nomem_return;
1385
1386        ch->cdev = cdev;
1387        snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1388        ch->type = type;
1389
1390        /**
1391         * "static" ccws are used in the following way:
1392         *
1393         * ccw[0..2] (Channel program for generic I/O):
1394         *           0: prepare
1395         *           1: read or write (depending on direction) with fixed
1396         *              buffer (idal allocated once when buffer is allocated)
1397         *           2: nop
1398         * ccw[3..5] (Channel program for direct write of packets)
1399         *           3: prepare
1400         *           4: write (idal allocated on every write).
1401         *           5: nop
1402         * ccw[6..7] (Channel program for initial channel setup):
1403         *           6: set extended mode
1404         *           7: nop
1405         *
1406         * ch->ccw[0..5] are initialized in ch_action_start because
1407         * the channel's direction is yet unknown here.
1408         *
1409         * ccws used for xid2 negotiations
1410         *  ch-ccw[8-14] need to be used for the XID exchange either
1411         *    X side XID2 Processing
1412         *       8:  write control
1413         *       9:  write th
1414         *           10: write XID
1415         *           11: read th from secondary
1416         *           12: read XID   from secondary
1417         *           13: read 4 byte ID
1418         *           14: nop
1419         *    Y side XID Processing
1420         *           8:  sense
1421         *       9:  read th
1422         *           10: read XID
1423         *           11: write th
1424         *           12: write XID
1425         *           13: write 4 byte ID
1426         *           14: nop
1427         *
1428         *  ccws used for double noop due to VM timing issues
1429         *  which result in unrecoverable Busy on channel
1430         *       15: nop
1431         *       16: nop
1432         */
1433        ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1434        ch->ccw[6].flags        = CCW_FLAG_SLI;
1435
1436        ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1437        ch->ccw[7].flags        = CCW_FLAG_SLI;
1438
1439        if (IS_MPC(priv)) {
1440                ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1441                ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1442                ch->ccw[15].count    = TH_HEADER_LENGTH;
1443                ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1444
1445                ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1446                ch->ccw[16].flags    = CCW_FLAG_SLI;
1447
1448                ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1449                                ctc_ch_event_names, CTC_MPC_NR_STATES,
1450                                CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1451                                mpc_ch_fsm_len, GFP_KERNEL);
1452        } else {
1453                ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1454                                ctc_ch_event_names, CTC_NR_STATES,
1455                                CTC_NR_EVENTS, ch_fsm,
1456                                ch_fsm_len, GFP_KERNEL);
1457        }
1458        if (ch->fsm == NULL)
1459                                goto nomem_return;
1460
1461        fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1462
1463        ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1464        if (ch->irb == NULL)
1465                                goto nomem_return;
1466
1467        while (*c && ctcm_less_than((*c)->id, ch->id))
1468                c = &(*c)->next;
1469
1470        if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1471                CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1472                                "%s (%s) already in list, using old entry",
1473                                __func__, (*c)->id);
1474
1475                                goto free_return;
1476        }
1477
1478        spin_lock_init(&ch->collect_lock);
1479
1480        fsm_settimer(ch->fsm, &ch->timer);
1481        skb_queue_head_init(&ch->io_queue);
1482        skb_queue_head_init(&ch->collect_queue);
1483
1484        if (IS_MPC(priv)) {
1485                fsm_settimer(ch->fsm, &ch->sweep_timer);
1486                skb_queue_head_init(&ch->sweep_queue);
1487        }
1488        ch->next = *c;
1489        *c = ch;
1490        return 0;
1491
1492nomem_return:
1493        rc = -ENOMEM;
1494
1495free_return:    /* note that all channel pointers are 0 or valid */
1496        kfree(ch->ccw);
1497        kfree(ch->discontact_th);
1498        kfree_fsm(ch->fsm);
1499        kfree(ch->irb);
1500        kfree(ch);
1501        return rc;
1502}
1503
1504/*
1505 * Return type of a detected device.
1506 */
1507static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1508{
1509        enum ctcm_channel_types type;
1510        type = (enum ctcm_channel_types)id->driver_info;
1511
1512        if (type == ctcm_channel_type_ficon)
1513                type = ctcm_channel_type_escon;
1514
1515        return type;
1516}
1517
1518/**
1519 *
1520 * Setup an interface.
1521 *
1522 *  cgdev       Device to be setup.
1523 *
1524 * returns 0 on success, !0 on failure.
1525 */
1526static int ctcm_new_device(struct ccwgroup_device *cgdev)
1527{
1528        char read_id[CTCM_ID_SIZE];
1529        char write_id[CTCM_ID_SIZE];
1530        int direction;
1531        enum ctcm_channel_types type;
1532        struct ctcm_priv *priv;
1533        struct net_device *dev;
1534        struct ccw_device *cdev0;
1535        struct ccw_device *cdev1;
1536        struct channel *readc;
1537        struct channel *writec;
1538        int ret;
1539        int result;
1540
1541        priv = dev_get_drvdata(&cgdev->dev);
1542        if (!priv) {
1543                result = -ENODEV;
1544                goto out_err_result;
1545        }
1546
1547        cdev0 = cgdev->cdev[0];
1548        cdev1 = cgdev->cdev[1];
1549
1550        type = get_channel_type(&cdev0->id);
1551
1552        snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1553        snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1554
1555        ret = add_channel(cdev0, type, priv);
1556        if (ret) {
1557                result = ret;
1558                goto out_err_result;
1559        }
1560        ret = add_channel(cdev1, type, priv);
1561        if (ret) {
1562                result = ret;
1563                goto out_remove_channel1;
1564        }
1565
1566        ret = ccw_device_set_online(cdev0);
1567        if (ret != 0) {
1568                CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1569                        "%s(%s) set_online rc=%d",
1570                                CTCM_FUNTAIL, read_id, ret);
1571                result = -EIO;
1572                goto out_remove_channel2;
1573        }
1574
1575        ret = ccw_device_set_online(cdev1);
1576        if (ret != 0) {
1577                CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1578                        "%s(%s) set_online rc=%d",
1579                                CTCM_FUNTAIL, write_id, ret);
1580
1581                result = -EIO;
1582                goto out_ccw1;
1583        }
1584
1585        dev = ctcm_init_netdevice(priv);
1586        if (dev == NULL) {
1587                result = -ENODEV;
1588                goto out_ccw2;
1589        }
1590
1591        for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1592                priv->channel[direction] =
1593                        channel_get(type, direction == CTCM_READ ?
1594                                read_id : write_id, direction);
1595                if (priv->channel[direction] == NULL) {
1596                        if (direction == CTCM_WRITE)
1597                                channel_free(priv->channel[CTCM_READ]);
1598                        goto out_dev;
1599                }
1600                priv->channel[direction]->netdev = dev;
1601                priv->channel[direction]->protocol = priv->protocol;
1602                priv->channel[direction]->max_bufsize = priv->buffer_size;
1603        }
1604        /* sysfs magic */
1605        SET_NETDEV_DEV(dev, &cgdev->dev);
1606
1607        if (register_netdev(dev)) {
1608                result = -ENODEV;
1609                goto out_dev;
1610        }
1611
1612        strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1613
1614        dev_info(&dev->dev,
1615                "setup OK : r/w = %s/%s, protocol : %d\n",
1616                        priv->channel[CTCM_READ]->id,
1617                        priv->channel[CTCM_WRITE]->id, priv->protocol);
1618
1619        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1620                "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1621                        priv->channel[CTCM_READ]->id,
1622                        priv->channel[CTCM_WRITE]->id, priv->protocol);
1623
1624        return 0;
1625out_dev:
1626        ctcm_free_netdevice(dev);
1627out_ccw2:
1628        ccw_device_set_offline(cgdev->cdev[1]);
1629out_ccw1:
1630        ccw_device_set_offline(cgdev->cdev[0]);
1631out_remove_channel2:
1632        readc = channel_get(type, read_id, CTCM_READ);
1633        channel_remove(readc);
1634out_remove_channel1:
1635        writec = channel_get(type, write_id, CTCM_WRITE);
1636        channel_remove(writec);
1637out_err_result:
1638        return result;
1639}
1640
1641/**
1642 * Shutdown an interface.
1643 *
1644 *  cgdev       Device to be shut down.
1645 *
1646 * returns 0 on success, !0 on failure.
1647 */
1648static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1649{
1650        struct ctcm_priv *priv;
1651        struct net_device *dev;
1652
1653        priv = dev_get_drvdata(&cgdev->dev);
1654        if (!priv)
1655                return -ENODEV;
1656
1657        if (priv->channel[CTCM_READ]) {
1658                dev = priv->channel[CTCM_READ]->netdev;
1659                CTCM_DBF_DEV(SETUP, dev, "");
1660                /* Close the device */
1661                ctcm_close(dev);
1662                dev->flags &= ~IFF_RUNNING;
1663                channel_free(priv->channel[CTCM_READ]);
1664        } else
1665                dev = NULL;
1666
1667        if (priv->channel[CTCM_WRITE])
1668                channel_free(priv->channel[CTCM_WRITE]);
1669
1670        if (dev) {
1671                unregister_netdev(dev);
1672                ctcm_free_netdevice(dev);
1673        }
1674
1675        if (priv->fsm)
1676                kfree_fsm(priv->fsm);
1677
1678        ccw_device_set_offline(cgdev->cdev[1]);
1679        ccw_device_set_offline(cgdev->cdev[0]);
1680
1681        if (priv->channel[CTCM_READ])
1682                channel_remove(priv->channel[CTCM_READ]);
1683        if (priv->channel[CTCM_WRITE])
1684                channel_remove(priv->channel[CTCM_WRITE]);
1685        priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1686
1687        return 0;
1688
1689}
1690
1691
1692static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1693{
1694        struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1695
1696        CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1697                        "removing device %p, proto : %d",
1698                        cgdev, priv->protocol);
1699
1700        if (cgdev->state == CCWGROUP_ONLINE)
1701                ctcm_shutdown_device(cgdev);
1702        dev_set_drvdata(&cgdev->dev, NULL);
1703        kfree(priv);
1704        put_device(&cgdev->dev);
1705}
1706
1707static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1708{
1709        struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1710
1711        if (gdev->state == CCWGROUP_OFFLINE)
1712                return 0;
1713        netif_device_detach(priv->channel[CTCM_READ]->netdev);
1714        ctcm_close(priv->channel[CTCM_READ]->netdev);
1715        if (!wait_event_timeout(priv->fsm->wait_q,
1716            fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1717                netif_device_attach(priv->channel[CTCM_READ]->netdev);
1718                return -EBUSY;
1719        }
1720        ccw_device_set_offline(gdev->cdev[1]);
1721        ccw_device_set_offline(gdev->cdev[0]);
1722        return 0;
1723}
1724
1725static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1726{
1727        struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1728        int rc;
1729
1730        if (gdev->state == CCWGROUP_OFFLINE)
1731                return 0;
1732        rc = ccw_device_set_online(gdev->cdev[1]);
1733        if (rc)
1734                goto err_out;
1735        rc = ccw_device_set_online(gdev->cdev[0]);
1736        if (rc)
1737                goto err_out;
1738        ctcm_open(priv->channel[CTCM_READ]->netdev);
1739err_out:
1740        netif_device_attach(priv->channel[CTCM_READ]->netdev);
1741        return rc;
1742}
1743
1744static struct ccw_device_id ctcm_ids[] = {
1745        {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1746        {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1747        {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1748        {},
1749};
1750MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1751
1752static struct ccw_driver ctcm_ccw_driver = {
1753        .driver = {
1754                .owner  = THIS_MODULE,
1755                .name   = "ctcm",
1756        },
1757        .ids    = ctcm_ids,
1758        .probe  = ccwgroup_probe_ccwdev,
1759        .remove = ccwgroup_remove_ccwdev,
1760        .int_class = IRQIO_CTC,
1761};
1762
1763static struct ccwgroup_driver ctcm_group_driver = {
1764        .driver = {
1765                .owner  = THIS_MODULE,
1766                .name   = CTC_DRIVER_NAME,
1767        },
1768        .setup       = ctcm_probe_device,
1769        .remove      = ctcm_remove_device,
1770        .set_online  = ctcm_new_device,
1771        .set_offline = ctcm_shutdown_device,
1772        .freeze      = ctcm_pm_suspend,
1773        .thaw        = ctcm_pm_resume,
1774        .restore     = ctcm_pm_resume,
1775};
1776
1777static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1778                                       const char *buf, size_t count)
1779{
1780        int err;
1781
1782        err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1783        return err ? err : count;
1784}
1785static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1786
1787static struct attribute *ctcm_drv_attrs[] = {
1788        &driver_attr_group.attr,
1789        NULL,
1790};
1791static struct attribute_group ctcm_drv_attr_group = {
1792        .attrs = ctcm_drv_attrs,
1793};
1794static const struct attribute_group *ctcm_drv_attr_groups[] = {
1795        &ctcm_drv_attr_group,
1796        NULL,
1797};
1798
1799/*
1800 * Module related routines
1801 */
1802
1803/*
1804 * Prepare to be unloaded. Free IRQ's and release all resources.
1805 * This is called just before this module is unloaded. It is
1806 * not called, if the usage count is !0, so we don't need to check
1807 * for that.
1808 */
1809static void __exit ctcm_exit(void)
1810{
1811        ccwgroup_driver_unregister(&ctcm_group_driver);
1812        ccw_driver_unregister(&ctcm_ccw_driver);
1813        root_device_unregister(ctcm_root_dev);
1814        ctcm_unregister_dbf_views();
1815        pr_info("CTCM driver unloaded\n");
1816}
1817
1818/*
1819 * Print Banner.
1820 */
1821static void print_banner(void)
1822{
1823        pr_info("CTCM driver initialized\n");
1824}
1825
1826/**
1827 * Initialize module.
1828 * This is called just after the module is loaded.
1829 *
1830 * returns 0 on success, !0 on error.
1831 */
1832static int __init ctcm_init(void)
1833{
1834        int ret;
1835
1836        channels = NULL;
1837
1838        ret = ctcm_register_dbf_views();
1839        if (ret)
1840                goto out_err;
1841        ctcm_root_dev = root_device_register("ctcm");
1842        ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1843        if (ret)
1844                goto register_err;
1845        ret = ccw_driver_register(&ctcm_ccw_driver);
1846        if (ret)
1847                goto ccw_err;
1848        ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1849        ret = ccwgroup_driver_register(&ctcm_group_driver);
1850        if (ret)
1851                goto ccwgroup_err;
1852        print_banner();
1853        return 0;
1854
1855ccwgroup_err:
1856        ccw_driver_unregister(&ctcm_ccw_driver);
1857ccw_err:
1858        root_device_unregister(ctcm_root_dev);
1859register_err:
1860        ctcm_unregister_dbf_views();
1861out_err:
1862        pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1863                __func__, ret);
1864        return ret;
1865}
1866
1867module_init(ctcm_init);
1868module_exit(ctcm_exit);
1869
1870MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1871MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1872MODULE_LICENSE("GPL");
1873
1874
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