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lcs.c

/*
 *  linux/drivers/s390/net/lcs.c
 *
 *  Linux for S/390 Lan Channel Station Network Driver
 *
 *  Copyright (C)  1999-2001 IBM Deutschland Entwicklung GmbH,
 *                     IBM Corporation
 *    Author(s): Original Code written by
 *                  DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
 *           Rewritten by
 *                  Frank Pavlic (fpavlic@de.ibm.com) and
 *                  Martin Schwidefsky <schwidefsky@de.ibm.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.      See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <linux/module.h>
#include <linux/if.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/trdevice.h>
#include <linux/fddidevice.h>
#include <linux/inetdevice.h>
#include <linux/in.h>
#include <linux/igmp.h>
#include <linux/delay.h>
#include <net/arp.h>
#include <net/ip.h>

#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/timex.h>
#include <linux/device.h>
#include <asm/ccwgroup.h>

#include "lcs.h"
#include "cu3088.h"


#if !defined(CONFIG_NET_ETHERNET) && \
    !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
#error Cannot compile lcs.c without some net devices switched on.
#endif

/**
 * initialization string for output
 */

static char version[] __initdata = "LCS driver";
static char debug_buffer[255];

/**
 * Some prototypes.
 */
static void lcs_tasklet(unsigned long);
static void lcs_start_kernel_thread(struct lcs_card *card);
static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
static int lcs_recovery(void *ptr);

/**
 * Debug Facility Stuff
 */
static debug_info_t *lcs_dbf_setup;
static debug_info_t *lcs_dbf_trace;

/**
 *  LCS Debug Facility functions
 */
static void
lcs_unregister_debug_facility(void)
{
      if (lcs_dbf_setup)
            debug_unregister(lcs_dbf_setup);
      if (lcs_dbf_trace)
            debug_unregister(lcs_dbf_trace);
}

static int
lcs_register_debug_facility(void)
{
      lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
      lcs_dbf_trace = debug_register("lcs_trace", 2, 2, 8);
      if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
            PRINT_ERR("Not enough memory for debug facility.\n");
            lcs_unregister_debug_facility();
            return -ENOMEM;
      }
      debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
      debug_set_level(lcs_dbf_setup, 2);
      debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
      debug_set_level(lcs_dbf_trace, 2);
      return 0;
}

/**
 * Allocate io buffers.
 */
static int
lcs_alloc_channel(struct lcs_channel *channel)
{
      int cnt;

      LCS_DBF_TEXT(2, setup, "ichalloc");
      for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
            /* alloc memory fo iobuffer */
            channel->iob[cnt].data =
                  kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
            if (channel->iob[cnt].data == NULL)
                  break;
            channel->iob[cnt].state = BUF_STATE_EMPTY;
      }
      if (cnt < LCS_NUM_BUFFS) {
            /* Not all io buffers could be allocated. */
            LCS_DBF_TEXT(2, setup, "echalloc");
            while (cnt-- > 0)
                  kfree(channel->iob[cnt].data);
            return -ENOMEM;
      }
      return 0;
}

/**
 * Free io buffers.
 */
static void
lcs_free_channel(struct lcs_channel *channel)
{
      int cnt;

      LCS_DBF_TEXT(2, setup, "ichfree");
      for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
            kfree(channel->iob[cnt].data);
            channel->iob[cnt].data = NULL;
      }
}

/*
 * Cleanup channel.
 */
static void
lcs_cleanup_channel(struct lcs_channel *channel)
{
      LCS_DBF_TEXT(3, setup, "cleanch");
      /* Kill write channel tasklets. */
      tasklet_kill(&channel->irq_tasklet);
      /* Free channel buffers. */
      lcs_free_channel(channel);
}

/**
 * LCS free memory for card and channels.
 */
static void
lcs_free_card(struct lcs_card *card)
{
      LCS_DBF_TEXT(2, setup, "remcard");
      LCS_DBF_HEX(2, setup, &card, sizeof(void*));
      kfree(card);
}

/**
 * LCS alloc memory for card and channels
 */
static struct lcs_card *
lcs_alloc_card(void)
{
      struct lcs_card *card;
      int rc;

      LCS_DBF_TEXT(2, setup, "alloclcs");

      card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
      if (card == NULL)
            return NULL;
      card->lan_type = LCS_FRAME_TYPE_AUTO;
      card->pkt_seq = 0;
      card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
      /* Allocate io buffers for the read channel. */
      rc = lcs_alloc_channel(&card->read);
      if (rc){
            LCS_DBF_TEXT(2, setup, "iccwerr");
            lcs_free_card(card);
            return NULL;
      }
      /* Allocate io buffers for the write channel. */
      rc = lcs_alloc_channel(&card->write);
      if (rc) {
            LCS_DBF_TEXT(2, setup, "iccwerr");
            lcs_cleanup_channel(&card->read);
            lcs_free_card(card);
            return NULL;
      }

#ifdef CONFIG_IP_MULTICAST
      INIT_LIST_HEAD(&card->ipm_list);
#endif
      LCS_DBF_HEX(2, setup, &card, sizeof(void*));
      return card;
}

/*
 * Setup read channel.
 */
static void
lcs_setup_read_ccws(struct lcs_card *card)
{
      int cnt;

      LCS_DBF_TEXT(2, setup, "ireadccw");
      /* Setup read ccws. */
      memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
      for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
            card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
            card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
            card->read.ccws[cnt].flags =
                  CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
            /*
             * Note: we have allocated the buffer with GFP_DMA, so
             * we do not need to do set_normalized_cda.
             */
            card->read.ccws[cnt].cda =
                  (__u32) __pa(card->read.iob[cnt].data);
            ((struct lcs_header *)
             card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
            card->read.iob[cnt].callback = lcs_get_frames_cb;
            card->read.iob[cnt].state = BUF_STATE_READY;
            card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
      }
      card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
      card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
      card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
      /* Last ccw is a tic (transfer in channel). */
      card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
      card->read.ccws[LCS_NUM_BUFFS].cda =
            (__u32) __pa(card->read.ccws);
      /* Setg initial state of the read channel. */
      card->read.state = CH_STATE_INIT;

      card->read.io_idx = 0;
      card->read.buf_idx = 0;
}

static void
lcs_setup_read(struct lcs_card *card)
{
      LCS_DBF_TEXT(3, setup, "initread");

      lcs_setup_read_ccws(card);
      /* Initialize read channel tasklet. */
      card->read.irq_tasklet.data = (unsigned long) &card->read;
      card->read.irq_tasklet.func = lcs_tasklet;
      /* Initialize waitqueue. */
      init_waitqueue_head(&card->read.wait_q);
}

/*
 * Setup write channel.
 */
static void
lcs_setup_write_ccws(struct lcs_card *card)
{
      int cnt;

      LCS_DBF_TEXT(3, setup, "iwritccw");
      /* Setup write ccws. */
      memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
      for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
            card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
            card->write.ccws[cnt].count = 0;
            card->write.ccws[cnt].flags =
                  CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
            /*
             * Note: we have allocated the buffer with GFP_DMA, so
             * we do not need to do set_normalized_cda.
             */
            card->write.ccws[cnt].cda =
                  (__u32) __pa(card->write.iob[cnt].data);
      }
      /* Last ccw is a tic (transfer in channel). */
      card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
      card->write.ccws[LCS_NUM_BUFFS].cda =
            (__u32) __pa(card->write.ccws);
      /* Set initial state of the write channel. */
      card->read.state = CH_STATE_INIT;

      card->write.io_idx = 0;
      card->write.buf_idx = 0;
}

static void
lcs_setup_write(struct lcs_card *card)
{
      LCS_DBF_TEXT(3, setup, "initwrit");

      lcs_setup_write_ccws(card);
      /* Initialize write channel tasklet. */
      card->write.irq_tasklet.data = (unsigned long) &card->write;
      card->write.irq_tasklet.func = lcs_tasklet;
      /* Initialize waitqueue. */
      init_waitqueue_head(&card->write.wait_q);
}

static void
lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
{
      unsigned long flags;

      spin_lock_irqsave(&card->mask_lock, flags);
      card->thread_allowed_mask = threads;
      spin_unlock_irqrestore(&card->mask_lock, flags);
      wake_up(&card->wait_q);
}
static inline int
lcs_threads_running(struct lcs_card *card, unsigned long threads)
{
        unsigned long flags;
        int rc = 0;

      spin_lock_irqsave(&card->mask_lock, flags);
        rc = (card->thread_running_mask & threads);
      spin_unlock_irqrestore(&card->mask_lock, flags);
        return rc;
}

static int
lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
{
        return wait_event_interruptible(card->wait_q,
                        lcs_threads_running(card, threads) == 0);
}

static inline int
lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
{
        unsigned long flags;

      spin_lock_irqsave(&card->mask_lock, flags);
        if ( !(card->thread_allowed_mask & thread) ||
              (card->thread_start_mask & thread) ) {
                spin_unlock_irqrestore(&card->mask_lock, flags);
                return -EPERM;
        }
        card->thread_start_mask |= thread;
      spin_unlock_irqrestore(&card->mask_lock, flags);
        return 0;
}

static void
lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
{
        unsigned long flags;

      spin_lock_irqsave(&card->mask_lock, flags);
        card->thread_running_mask &= ~thread;
      spin_unlock_irqrestore(&card->mask_lock, flags);
        wake_up(&card->wait_q);
}

static inline int
__lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
{
        unsigned long flags;
        int rc = 0;

      spin_lock_irqsave(&card->mask_lock, flags);
        if (card->thread_start_mask & thread){
                if ((card->thread_allowed_mask & thread) &&
                    !(card->thread_running_mask & thread)){
                        rc = 1;
                        card->thread_start_mask &= ~thread;
                        card->thread_running_mask |= thread;
                } else
                        rc = -EPERM;
        }
      spin_unlock_irqrestore(&card->mask_lock, flags);
        return rc;
}

static int
lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
{
        int rc = 0;
        wait_event(card->wait_q,
                   (rc = __lcs_do_run_thread(card, thread)) >= 0);
        return rc;
}

static int
lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
{
        unsigned long flags;
        int rc = 0;

      spin_lock_irqsave(&card->mask_lock, flags);
        LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
                        (u8) card->thread_start_mask,
                        (u8) card->thread_allowed_mask,
                        (u8) card->thread_running_mask);
        rc = (card->thread_start_mask & thread);
      spin_unlock_irqrestore(&card->mask_lock, flags);
        return rc;
}

/**
 * Initialize channels,card and state machines.
 */
static void
lcs_setup_card(struct lcs_card *card)
{
      LCS_DBF_TEXT(2, setup, "initcard");
      LCS_DBF_HEX(2, setup, &card, sizeof(void*));

      lcs_setup_read(card);
      lcs_setup_write(card);
      /* Set cards initial state. */
      card->state = DEV_STATE_DOWN;
      card->tx_buffer = NULL;
      card->tx_emitted = 0;

      init_waitqueue_head(&card->wait_q);
      spin_lock_init(&card->lock);
      spin_lock_init(&card->ipm_lock);
      spin_lock_init(&card->mask_lock);
#ifdef CONFIG_IP_MULTICAST
      INIT_LIST_HEAD(&card->ipm_list);
#endif
      INIT_LIST_HEAD(&card->lancmd_waiters);
}

static inline void
lcs_clear_multicast_list(struct lcs_card *card)
{
#ifdef      CONFIG_IP_MULTICAST
      struct lcs_ipm_list *ipm;
      unsigned long flags;

      /* Free multicast list. */
      LCS_DBF_TEXT(3, setup, "clmclist");
      spin_lock_irqsave(&card->ipm_lock, flags);
      while (!list_empty(&card->ipm_list)){
            ipm = list_entry(card->ipm_list.next,
                         struct lcs_ipm_list, list);
            list_del(&ipm->list);
            if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
                  spin_unlock_irqrestore(&card->ipm_lock, flags);
                  lcs_send_delipm(card, ipm);
                  spin_lock_irqsave(&card->ipm_lock, flags);
            }
            kfree(ipm);
      }
      spin_unlock_irqrestore(&card->ipm_lock, flags);
#endif
}
/**
 * Cleanup channels,card and state machines.
 */
static void
lcs_cleanup_card(struct lcs_card *card)
{

      LCS_DBF_TEXT(3, setup, "cleancrd");
      LCS_DBF_HEX(2,setup,&card,sizeof(void*));

      if (card->dev != NULL)
            free_netdev(card->dev);
      /* Cleanup channels. */
      lcs_cleanup_channel(&card->write);
      lcs_cleanup_channel(&card->read);
}

/**
 * Start channel.
 */
static int
lcs_start_channel(struct lcs_channel *channel)
{
      unsigned long flags;
      int rc;

      LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      rc = ccw_device_start(channel->ccwdev,
                        channel->ccws + channel->io_idx, 0, 0,
                        DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
      if (rc == 0)
            channel->state = CH_STATE_RUNNING;
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
      if (rc) {
            LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
            PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
      }
      return rc;
}

static int
lcs_clear_channel(struct lcs_channel *channel)
{
      unsigned long flags;
      int rc;

      LCS_DBF_TEXT(4,trace,"clearch");
      LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
      if (rc) {
            LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
            return rc;
      }
      wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
      channel->state = CH_STATE_STOPPED;
      return rc;
}


/**
 * Stop channel.
 */
static int
lcs_stop_channel(struct lcs_channel *channel)
{
      unsigned long flags;
      int rc;

      if (channel->state == CH_STATE_STOPPED)
            return 0;
      LCS_DBF_TEXT(4,trace,"haltsch");
      LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
      channel->state = CH_STATE_INIT;
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
      if (rc) {
            LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
            return rc;
      }
      /* Asynchronous halt initialted. Wait for its completion. */
      wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
      lcs_clear_channel(channel);
      return 0;
}

/**
 * start read and write channel
 */
static int
lcs_start_channels(struct lcs_card *card)
{
      int rc;

      LCS_DBF_TEXT(2, trace, "chstart");
      /* start read channel */
      rc = lcs_start_channel(&card->read);
      if (rc)
            return rc;
      /* start write channel */
      rc = lcs_start_channel(&card->write);
      if (rc)
            lcs_stop_channel(&card->read);
      return rc;
}

/**
 * stop read and write channel
 */
static int
lcs_stop_channels(struct lcs_card *card)
{
      LCS_DBF_TEXT(2, trace, "chhalt");
      lcs_stop_channel(&card->read);
      lcs_stop_channel(&card->write);
      return 0;
}

/**
 * Get empty buffer.
 */
static struct lcs_buffer *
__lcs_get_buffer(struct lcs_channel *channel)
{
      int index;

      LCS_DBF_TEXT(5, trace, "_getbuff");
      index = channel->io_idx;
      do {
            if (channel->iob[index].state == BUF_STATE_EMPTY) {
                  channel->iob[index].state = BUF_STATE_LOCKED;
                  return channel->iob + index;
            }
            index = (index + 1) & (LCS_NUM_BUFFS - 1);
      } while (index != channel->io_idx);
      return NULL;
}

static struct lcs_buffer *
lcs_get_buffer(struct lcs_channel *channel)
{
      struct lcs_buffer *buffer;
      unsigned long flags;

      LCS_DBF_TEXT(5, trace, "getbuff");
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      buffer = __lcs_get_buffer(channel);
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
      return buffer;
}

/**
 * Resume channel program if the channel is suspended.
 */
static int
__lcs_resume_channel(struct lcs_channel *channel)
{
      int rc;

      if (channel->state != CH_STATE_SUSPENDED)
            return 0;
      if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
            return 0;
      LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
      rc = ccw_device_resume(channel->ccwdev);
      if (rc) {
            LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
            PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
      } else
            channel->state = CH_STATE_RUNNING;
      return rc;

}

/**
 * Make a buffer ready for processing.
 */
static inline void
__lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
{
      int prev, next;

      LCS_DBF_TEXT(5, trace, "rdybits");
      prev = (index - 1) & (LCS_NUM_BUFFS - 1);
      next = (index + 1) & (LCS_NUM_BUFFS - 1);
      /* Check if we may clear the suspend bit of this buffer. */
      if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
            /* Check if we have to set the PCI bit. */
            if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
                  /* Suspend bit of the previous buffer is not set. */
                  channel->ccws[index].flags |= CCW_FLAG_PCI;
            /* Suspend bit of the next buffer is set. */
            channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
      }
}

static int
lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
      unsigned long flags;
      int index, rc;

      LCS_DBF_TEXT(5, trace, "rdybuff");
      BUG_ON(buffer->state != BUF_STATE_LOCKED &&
             buffer->state != BUF_STATE_PROCESSED);
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      buffer->state = BUF_STATE_READY;
      index = buffer - channel->iob;
      /* Set length. */
      channel->ccws[index].count = buffer->count;
      /* Check relevant PCI/suspend bits. */
      __lcs_ready_buffer_bits(channel, index);
      rc = __lcs_resume_channel(channel);
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
      return rc;
}

/**
 * Mark the buffer as processed. Take care of the suspend bit
 * of the previous buffer. This function is called from
 * interrupt context, so the lock must not be taken.
 */
static int
__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
      int index, prev, next;

      LCS_DBF_TEXT(5, trace, "prcsbuff");
      BUG_ON(buffer->state != BUF_STATE_READY);
      buffer->state = BUF_STATE_PROCESSED;
      index = buffer - channel->iob;
      prev = (index - 1) & (LCS_NUM_BUFFS - 1);
      next = (index + 1) & (LCS_NUM_BUFFS - 1);
      /* Set the suspend bit and clear the PCI bit of this buffer. */
      channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
      channel->ccws[index].flags &= ~CCW_FLAG_PCI;
      /* Check the suspend bit of the previous buffer. */
      if (channel->iob[prev].state == BUF_STATE_READY) {
            /*
             * Previous buffer is in state ready. It might have
             * happened in lcs_ready_buffer that the suspend bit
             * has not been cleared to avoid an endless loop.
             * Do it now.
             */
            __lcs_ready_buffer_bits(channel, prev);
      }
      /* Clear PCI bit of next buffer. */
      channel->ccws[next].flags &= ~CCW_FLAG_PCI;
      return __lcs_resume_channel(channel);
}

/**
 * Put a processed buffer back to state empty.
 */
static void
lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
      unsigned long flags;

      LCS_DBF_TEXT(5, trace, "relbuff");
      BUG_ON(buffer->state != BUF_STATE_LOCKED &&
             buffer->state != BUF_STATE_PROCESSED);
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      buffer->state = BUF_STATE_EMPTY;
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
}

/**
 * Get buffer for a lan command.
 */
static struct lcs_buffer *
lcs_get_lancmd(struct lcs_card *card, int count)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(4, trace, "getlncmd");
      /* Get buffer and wait if none is available. */
      wait_event(card->write.wait_q,
               ((buffer = lcs_get_buffer(&card->write)) != NULL));
      count += sizeof(struct lcs_header);
      *(__u16 *)(buffer->data + count) = 0;
      buffer->count = count + sizeof(__u16);
      buffer->callback = lcs_release_buffer;
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->offset = count;
      cmd->type = LCS_FRAME_TYPE_CONTROL;
      cmd->slot = 0;
      return buffer;
}


static void
lcs_get_reply(struct lcs_reply *reply)
{
      WARN_ON(atomic_read(&reply->refcnt) <= 0);
      atomic_inc(&reply->refcnt);
}

static void
lcs_put_reply(struct lcs_reply *reply)
{
        WARN_ON(atomic_read(&reply->refcnt) <= 0);
        if (atomic_dec_and_test(&reply->refcnt)) {
            kfree(reply);
      }

}

static struct lcs_reply *
lcs_alloc_reply(struct lcs_cmd *cmd)
{
      struct lcs_reply *reply;

      LCS_DBF_TEXT(4, trace, "getreply");

      reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
      if (!reply)
            return NULL;
      atomic_set(&reply->refcnt,1);
      reply->sequence_no = cmd->sequence_no;
      reply->received = 0;
      reply->rc = 0;
      init_waitqueue_head(&reply->wait_q);

      return reply;
}

/**
 * Notifier function for lancmd replies. Called from read irq.
 */
static void
lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
{
      struct list_head *l, *n;
      struct lcs_reply *reply;

      LCS_DBF_TEXT(4, trace, "notiwait");
      spin_lock(&card->lock);
      list_for_each_safe(l, n, &card->lancmd_waiters) {
            reply = list_entry(l, struct lcs_reply, list);
            if (reply->sequence_no == cmd->sequence_no) {
                  lcs_get_reply(reply);
                  list_del_init(&reply->list);
                  if (reply->callback != NULL)
                        reply->callback(card, cmd);
                  reply->received = 1;
                  reply->rc = cmd->return_code;
                  wake_up(&reply->wait_q);
                  lcs_put_reply(reply);
                  break;
            }
      }
      spin_unlock(&card->lock);
}

/**
 * Emit buffer of a lan comand.
 */
void
lcs_lancmd_timeout(unsigned long data)
{
      struct lcs_reply *reply, *list_reply, *r;
      unsigned long flags;

      LCS_DBF_TEXT(4, trace, "timeout");
      reply = (struct lcs_reply *) data;
      spin_lock_irqsave(&reply->card->lock, flags);
      list_for_each_entry_safe(list_reply, r,
                         &reply->card->lancmd_waiters,list) {
            if (reply == list_reply) {
                  lcs_get_reply(reply);
                  list_del_init(&reply->list);
                  spin_unlock_irqrestore(&reply->card->lock, flags);
                  reply->received = 1;
                  reply->rc = -ETIME;
                  wake_up(&reply->wait_q);
                  lcs_put_reply(reply);
                  return;
            }
      }
      spin_unlock_irqrestore(&reply->card->lock, flags);
}

static int
lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
            void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
{
      struct lcs_reply *reply;
      struct lcs_cmd *cmd;
      struct timer_list timer;
      unsigned long flags;
      int rc;

      LCS_DBF_TEXT(4, trace, "sendcmd");
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->return_code = 0;
      cmd->sequence_no = card->sequence_no++;
      reply = lcs_alloc_reply(cmd);
      if (!reply)
            return -ENOMEM;
      reply->callback = reply_callback;
      reply->card = card;
      spin_lock_irqsave(&card->lock, flags);
      list_add_tail(&reply->list, &card->lancmd_waiters);
      spin_unlock_irqrestore(&card->lock, flags);

      buffer->callback = lcs_release_buffer;
      rc = lcs_ready_buffer(&card->write, buffer);
      if (rc)
            return rc;
      init_timer(&timer);
      timer.function = lcs_lancmd_timeout;
      timer.data = (unsigned long) reply;
      timer.expires = jiffies + HZ*card->lancmd_timeout;
      add_timer(&timer);
      wait_event(reply->wait_q, reply->received);
      del_timer_sync(&timer);
      LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
      rc = reply->rc;
      lcs_put_reply(reply);
      return rc ? -EIO : 0;
}

/**
 * LCS startup command
 */
static int
lcs_send_startup(struct lcs_card *card, __u8 initiator)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "startup");
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_STARTUP;
      cmd->initiator = initiator;
      cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
      return lcs_send_lancmd(card, buffer, NULL);
}

/**
 * LCS shutdown command
 */
static int
lcs_send_shutdown(struct lcs_card *card)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "shutdown");
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_SHUTDOWN;
      cmd->initiator = LCS_INITIATOR_TCPIP;
      return lcs_send_lancmd(card, buffer, NULL);
}

/**
 * LCS lanstat command
 */
static void
__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
      LCS_DBF_TEXT(2, trace, "statcb");
      memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
}

static int
lcs_send_lanstat(struct lcs_card *card)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2,trace, "cmdstat");
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      /* Setup lanstat command. */
      cmd->cmd_code = LCS_CMD_LANSTAT;
      cmd->initiator = LCS_INITIATOR_TCPIP;
      cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
      cmd->cmd.lcs_std_cmd.portno = card->portno;
      return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
}

/**
 * send stoplan command
 */
static int
lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "cmdstpln");
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_STOPLAN;
      cmd->initiator = initiator;
      cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
      cmd->cmd.lcs_std_cmd.portno = card->portno;
      return lcs_send_lancmd(card, buffer, NULL);
}

/**
 * send startlan command
 */
static void
__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
      LCS_DBF_TEXT(2, trace, "srtlancb");
      card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
      card->portno = cmd->cmd.lcs_std_cmd.portno;
}

static int
lcs_send_startlan(struct lcs_card *card, __u8 initiator)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "cmdstaln");
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_STARTLAN;
      cmd->initiator = initiator;
      cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
      cmd->cmd.lcs_std_cmd.portno = card->portno;
      return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
}

#ifdef CONFIG_IP_MULTICAST
/**
 * send setipm command (Multicast)
 */
static int
lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "cmdsetim");
      buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_SETIPM;
      cmd->initiator = LCS_INITIATOR_TCPIP;
      cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
      cmd->cmd.lcs_qipassist.portno = card->portno;
      cmd->cmd.lcs_qipassist.version = 4;
      cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
      memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
             &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
      LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
      return lcs_send_lancmd(card, buffer, NULL);
}

/**
 * send delipm command (Multicast)
 */
static int
lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;

      LCS_DBF_TEXT(2, trace, "cmddelim");
      buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_DELIPM;
      cmd->initiator = LCS_INITIATOR_TCPIP;
      cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
      cmd->cmd.lcs_qipassist.portno = card->portno;
      cmd->cmd.lcs_qipassist.version = 4;
      cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
      memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
             &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
      LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
      return lcs_send_lancmd(card, buffer, NULL);
}

/**
 * check if multicast is supported by LCS
 */
static void
__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
{
      LCS_DBF_TEXT(2, trace, "chkmccb");
      card->ip_assists_supported =
            cmd->cmd.lcs_qipassist.ip_assists_supported;
      card->ip_assists_enabled =
            cmd->cmd.lcs_qipassist.ip_assists_enabled;
}

static int
lcs_check_multicast_support(struct lcs_card *card)
{
      struct lcs_buffer *buffer;
      struct lcs_cmd *cmd;
      int rc;

      LCS_DBF_TEXT(2, trace, "cmdqipa");
      /* Send query ipassist. */
      buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
      cmd = (struct lcs_cmd *) buffer->data;
      cmd->cmd_code = LCS_CMD_QIPASSIST;
      cmd->initiator = LCS_INITIATOR_TCPIP;
      cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
      cmd->cmd.lcs_qipassist.portno = card->portno;
      cmd->cmd.lcs_qipassist.version = 4;
      cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
      rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
      if (rc != 0) {
            PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
            return -EOPNOTSUPP;
      }
      if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
            return 0;
      return -EOPNOTSUPP;
}

/**
 * set or del multicast address on LCS card
 */
static void
lcs_fix_multicast_list(struct lcs_card *card)
{
      struct list_head failed_list;
      struct lcs_ipm_list *ipm, *tmp;
      unsigned long flags;
      int rc;

      LCS_DBF_TEXT(4,trace, "fixipm");
      INIT_LIST_HEAD(&failed_list);
      spin_lock_irqsave(&card->ipm_lock, flags);
list_modified:
      list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
            switch (ipm->ipm_state) {
            case LCS_IPM_STATE_SET_REQUIRED:
                  /* del from ipm_list so noone else can tamper with
                   * this entry */
                  list_del_init(&ipm->list);
                  spin_unlock_irqrestore(&card->ipm_lock, flags);
                  rc = lcs_send_setipm(card, ipm);
                  spin_lock_irqsave(&card->ipm_lock, flags);
                  if (rc) {
                        PRINT_INFO("Adding multicast address failed."
                                 "Table possibly full!\n");
                        /* store ipm in failed list -> will be added
                         * to ipm_list again, so a retry will be done
                         * during the next call of this function */
                        list_add_tail(&ipm->list, &failed_list);
                  } else {
                        ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
                        /* re-insert into ipm_list */
                        list_add_tail(&ipm->list, &card->ipm_list);
                  }
                  goto list_modified;
            case LCS_IPM_STATE_DEL_REQUIRED:
                  list_del(&ipm->list);
                  spin_unlock_irqrestore(&card->ipm_lock, flags);
                  lcs_send_delipm(card, ipm);
                  spin_lock_irqsave(&card->ipm_lock, flags);
                  kfree(ipm);
                  goto list_modified;
            case LCS_IPM_STATE_ON_CARD:
                  break;
            }
      }
      /* re-insert all entries from the failed_list into ipm_list */
      list_for_each_entry_safe(ipm, tmp, &failed_list, list)
            list_move_tail(&ipm->list, &card->ipm_list);

      spin_unlock_irqrestore(&card->ipm_lock, flags);
}

/**
 * get mac address for the relevant Multicast address
 */
static void
lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
{
      LCS_DBF_TEXT(4,trace, "getmac");
      if (dev->type == ARPHRD_IEEE802_TR)
            ip_tr_mc_map(ipm, mac);
      else
            ip_eth_mc_map(ipm, mac);
}

/**
 * function called by net device to handle multicast address relevant things
 */
static inline void
lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
{
      struct ip_mc_list *im4;
      struct list_head *l;
      struct lcs_ipm_list *ipm;
      unsigned long flags;
      char buf[MAX_ADDR_LEN];

      LCS_DBF_TEXT(4, trace, "remmclst");
      spin_lock_irqsave(&card->ipm_lock, flags);
      list_for_each(l, &card->ipm_list) {
            ipm = list_entry(l, struct lcs_ipm_list, list);
            for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
                  lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
                  if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
                       (memcmp(buf, &ipm->ipm.mac_addr,
                             LCS_MAC_LENGTH) == 0) )
                        break;
            }
            if (im4 == NULL)
                  ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
      }
      spin_unlock_irqrestore(&card->ipm_lock, flags);
}

static inline struct lcs_ipm_list *
lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
{
      struct lcs_ipm_list *tmp, *ipm = NULL;
      struct list_head *l;
      unsigned long flags;

      LCS_DBF_TEXT(4, trace, "chkmcent");
      spin_lock_irqsave(&card->ipm_lock, flags);
      list_for_each(l, &card->ipm_list) {
            tmp = list_entry(l, struct lcs_ipm_list, list);
            if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
                 (memcmp(buf, &tmp->ipm.mac_addr,
                       LCS_MAC_LENGTH) == 0) ) {
                  ipm = tmp;
                  break;
            }
      }
      spin_unlock_irqrestore(&card->ipm_lock, flags);
      return ipm;
}

static inline void
lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
{

      struct ip_mc_list *im4;
      struct lcs_ipm_list *ipm;
      char buf[MAX_ADDR_LEN];
      unsigned long flags;

      LCS_DBF_TEXT(4, trace, "setmclst");
      for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
            lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
            ipm = lcs_check_addr_entry(card, im4, buf);
            if (ipm != NULL)
                  continue;   /* Address already in list. */
            ipm = (struct lcs_ipm_list *)
                  kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
            if (ipm == NULL) {
                  PRINT_INFO("Not enough memory to add "
                           "new multicast entry!\n");
                  break;
            }
            memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
            ipm->ipm.ip_addr = im4->multiaddr;
            ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
            spin_lock_irqsave(&card->ipm_lock, flags);
            LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
            list_add(&ipm->list, &card->ipm_list);
            spin_unlock_irqrestore(&card->ipm_lock, flags);
      }
}

static int
lcs_register_mc_addresses(void *data)
{
      struct lcs_card *card;
      struct in_device *in4_dev;

      card = (struct lcs_card *) data;
      daemonize("regipm");

      if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
            return 0;
      LCS_DBF_TEXT(4, trace, "regmulti");

      in4_dev = in_dev_get(card->dev);
      if (in4_dev == NULL)
            goto out;
      read_lock(&in4_dev->mc_list_lock);
      lcs_remove_mc_addresses(card,in4_dev);
      lcs_set_mc_addresses(card, in4_dev);
      read_unlock(&in4_dev->mc_list_lock);
      in_dev_put(in4_dev);

      netif_carrier_off(card->dev);
      netif_tx_disable(card->dev);
      wait_event(card->write.wait_q,
                  (card->write.state != CH_STATE_RUNNING));
      lcs_fix_multicast_list(card);
      if (card->state == DEV_STATE_UP) {
            netif_carrier_on(card->dev);
            netif_wake_queue(card->dev);
      }
out:
      lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
      return 0;
}
/**
 * function called by net device to
 * handle multicast address relevant things
 */
static void
lcs_set_multicast_list(struct net_device *dev)
{
        struct lcs_card *card;

        LCS_DBF_TEXT(4, trace, "setmulti");
        card = (struct lcs_card *) dev->priv;

        if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
            schedule_work(&card->kernel_thread_starter);
}

#endif /* CONFIG_IP_MULTICAST */

static long
lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
{
      if (!IS_ERR(irb))
            return 0;

      switch (PTR_ERR(irb)) {
      case -EIO:
            PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
            LCS_DBF_TEXT(2, trace, "ckirberr");
            LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
            break;
      case -ETIMEDOUT:
            PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
            LCS_DBF_TEXT(2, trace, "ckirberr");
            LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
            break;
      default:
            PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
                     cdev->dev.bus_id);
            LCS_DBF_TEXT(2, trace, "ckirberr");
            LCS_DBF_TEXT(2, trace, "  rc???");
      }
      return PTR_ERR(irb);
}

static int
lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
{
      int dstat, cstat;
      char *sense;

      sense = (char *) irb->ecw;
      cstat = irb->scsw.cstat;
      dstat = irb->scsw.dstat;

      if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
                 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
                 SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
            LCS_DBF_TEXT(2, trace, "CGENCHK");
            return 1;
      }
      if (dstat & DEV_STAT_UNIT_CHECK) {
            if (sense[LCS_SENSE_BYTE_1] &
                LCS_SENSE_RESETTING_EVENT) {
                  LCS_DBF_TEXT(2, trace, "REVIND");
                  return 1;
            }
            if (sense[LCS_SENSE_BYTE_0] &
                LCS_SENSE_CMD_REJECT) {
                  LCS_DBF_TEXT(2, trace, "CMDREJ");
                  return 0;
            }
            if ((!sense[LCS_SENSE_BYTE_0]) &&
                (!sense[LCS_SENSE_BYTE_1]) &&
                (!sense[LCS_SENSE_BYTE_2]) &&
                (!sense[LCS_SENSE_BYTE_3])) {
                  LCS_DBF_TEXT(2, trace, "ZEROSEN");
                  return 0;
            }
            LCS_DBF_TEXT(2, trace, "DGENCHK");
            return 1;
      }
      return 0;
}

void
lcs_schedule_recovery(struct lcs_card *card)
{
      LCS_DBF_TEXT(2, trace, "startrec");
      if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
            schedule_work(&card->kernel_thread_starter);
}

/**
 * IRQ Handler for LCS channels
 */
static void
lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
{
      struct lcs_card *card;
      struct lcs_channel *channel;
      int rc, index;
      int cstat, dstat;

      if (lcs_check_irb_error(cdev, irb))
            return;

      card = CARD_FROM_DEV(cdev);
      if (card->read.ccwdev == cdev)
            channel = &card->read;
      else
            channel = &card->write;

      cstat = irb->scsw.cstat;
      dstat = irb->scsw.dstat;
      LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
      LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
      LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);

      /* Check for channel and device errors presented */
      rc = lcs_get_problem(cdev, irb);
      if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
            PRINT_WARN("check on device %s, dstat=0x%X, cstat=0x%X \n",
                      cdev->dev.bus_id, dstat, cstat);
            if (rc) {
                  lcs_schedule_recovery(card);
                  wake_up(&card->wait_q);
                  return;
            }
      }
      /* How far in the ccw chain have we processed? */
      if ((channel->state != CH_STATE_INIT) &&
          (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
            index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
                  - channel->ccws;
            if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
                (irb->scsw.cstat & SCHN_STAT_PCI))
                  /* Bloody io subsystem tells us lies about cpa... */
                  index = (index - 1) & (LCS_NUM_BUFFS - 1);
            while (channel->io_idx != index) {
                  __lcs_processed_buffer(channel,
                                     channel->iob + channel->io_idx);
                  channel->io_idx =
                        (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
            }
      }

      if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
          (irb->scsw.dstat & DEV_STAT_CHN_END) ||
          (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
            /* Mark channel as stopped. */
            channel->state = CH_STATE_STOPPED;
      else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
            /* CCW execution stopped on a suspend bit. */
            channel->state = CH_STATE_SUSPENDED;
      if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
            if (irb->scsw.cc != 0) {
                  ccw_device_halt(channel->ccwdev, (addr_t) channel);
                  return;
            }
            /* The channel has been stopped by halt_IO. */
            channel->state = CH_STATE_HALTED;
      }
      if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
            channel->state = CH_STATE_CLEARED;
      }
      /* Do the rest in the tasklet. */
      tasklet_schedule(&channel->irq_tasklet);
}

/**
 * Tasklet for IRQ handler
 */
static void
lcs_tasklet(unsigned long data)
{
      unsigned long flags;
      struct lcs_channel *channel;
      struct lcs_buffer *iob;
      int buf_idx;
      int rc;

      channel = (struct lcs_channel *) data;
      LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);

      /* Check for processed buffers. */
      iob = channel->iob;
      buf_idx = channel->buf_idx;
      while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
            /* Do the callback thing. */
            if (iob[buf_idx].callback != NULL)
                  iob[buf_idx].callback(channel, iob + buf_idx);
            buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
      }
      channel->buf_idx = buf_idx;

      if (channel->state == CH_STATE_STOPPED)
            // FIXME: what if rc != 0 ??
            rc = lcs_start_channel(channel);
      spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
      if (channel->state == CH_STATE_SUSPENDED &&
          channel->iob[channel->io_idx].state == BUF_STATE_READY) {
            // FIXME: what if rc != 0 ??
            rc = __lcs_resume_channel(channel);
      }
      spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);

      /* Something happened on the channel. Wake up waiters. */
      wake_up(&channel->wait_q);
}

/**
 * Finish current tx buffer and make it ready for transmit.
 */
static void
__lcs_emit_txbuffer(struct lcs_card *card)
{
      LCS_DBF_TEXT(5, trace, "emittx");
      *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
      card->tx_buffer->count += 2;
      lcs_ready_buffer(&card->write, card->tx_buffer);
      card->tx_buffer = NULL;
      card->tx_emitted++;
}

/**
 * Callback for finished tx buffers.
 */
static void
lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
      struct lcs_card *card;

      LCS_DBF_TEXT(5, trace, "txbuffcb");
      /* Put buffer back to pool. */
      lcs_release_buffer(channel, buffer);
      card = (struct lcs_card *)
            ((char *) channel - offsetof(struct lcs_card, write));
      if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
            netif_wake_queue(card->dev);
      spin_lock(&card->lock);
      card->tx_emitted--;
      if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
            /*
             * Last running tx buffer has finished. Submit partially
             * filled current buffer.
             */
            __lcs_emit_txbuffer(card);
      spin_unlock(&card->lock);
}

/**
 * Packet transmit function called by network stack
 */
static int
__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
             struct net_device *dev)
{
      struct lcs_header *header;
      int rc = 0;

      LCS_DBF_TEXT(5, trace, "hardxmit");
      if (skb == NULL) {
            card->stats.tx_dropped++;
            card->stats.tx_errors++;
            return -EIO;
      }
      if (card->state != DEV_STATE_UP) {
            dev_kfree_skb(skb);
            card->stats.tx_dropped++;
            card->stats.tx_errors++;
            card->stats.tx_carrier_errors++;
            return 0;
      }
      if (skb->protocol == htons(ETH_P_IPV6)) {
            dev_kfree_skb(skb);
            return 0;
      }
      netif_stop_queue(card->dev);
      spin_lock(&card->lock);
      if (card->tx_buffer != NULL &&
          card->tx_buffer->count + sizeof(struct lcs_header) +
          skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
            /* skb too big for current tx buffer. */
            __lcs_emit_txbuffer(card);
      if (card->tx_buffer == NULL) {
            /* Get new tx buffer */
            card->tx_buffer = lcs_get_buffer(&card->write);
            if (card->tx_buffer == NULL) {
                  card->stats.tx_dropped++;
                  rc = -EBUSY;
                  goto out;
            }
            card->tx_buffer->callback = lcs_txbuffer_cb;
            card->tx_buffer->count = 0;
      }
      header = (struct lcs_header *)
            (card->tx_buffer->data + card->tx_buffer->count);
      card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
      header->offset = card->tx_buffer->count;
      header->type = card->lan_type;
      header->slot = card->portno;
      memcpy(header + 1, skb->data, skb->len);
      spin_unlock(&card->lock);
      card->stats.tx_bytes += skb->len;
      card->stats.tx_packets++;
      dev_kfree_skb(skb);
      netif_wake_queue(card->dev);
      spin_lock(&card->lock);
      if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
            /* If this is the first tx buffer emit it immediately. */
            __lcs_emit_txbuffer(card);
out:
      spin_unlock(&card->lock);
      return rc;
}

static int
lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
{
      struct lcs_card *card;
      int rc;

      LCS_DBF_TEXT(5, trace, "pktxmit");
      card = (struct lcs_card *) dev->priv;
      rc = __lcs_start_xmit(card, skb, dev);
      return rc;
}

/**
 * send startlan and lanstat command to make LCS device ready
 */
static int
lcs_startlan_auto(struct lcs_card *card)
{
      int rc;

      LCS_DBF_TEXT(2, trace, "strtauto");
#ifdef CONFIG_NET_ETHERNET
      card->lan_type = LCS_FRAME_TYPE_ENET;
      rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
      if (rc == 0)
            return 0;

#endif
#ifdef CONFIG_TR
      card->lan_type = LCS_FRAME_TYPE_TR;
      rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
      if (rc == 0)
            return 0;
#endif
#ifdef CONFIG_FDDI
      card->lan_type = LCS_FRAME_TYPE_FDDI;
      rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
      if (rc == 0)
            return 0;
#endif
      return -EIO;
}

static int
lcs_startlan(struct lcs_card *card)
{
      int rc, i;

      LCS_DBF_TEXT(2, trace, "startlan");
      rc = 0;
      if (card->portno != LCS_INVALID_PORT_NO) {
            if (card->lan_type == LCS_FRAME_TYPE_AUTO)
                  rc = lcs_startlan_auto(card);
            else
                  rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
      } else {
                for (i = 0; i <= 16; i++) {
                        card->portno = i;
                        if (card->lan_type != LCS_FRAME_TYPE_AUTO)
                                rc = lcs_send_startlan(card,
                                                       LCS_INITIATOR_TCPIP);
                        else
                                /* autodetecting lan type */
                                rc = lcs_startlan_auto(card);
                        if (rc == 0)
                                break;
                }
        }
      if (rc == 0)
            return lcs_send_lanstat(card);
      return rc;
}

/**
 * LCS detect function
 * setup channels and make them I/O ready
 */
static int
lcs_detect(struct lcs_card *card)
{
      int rc = 0;

      LCS_DBF_TEXT(2, setup, "lcsdetct");
      /* start/reset card */
      if (card->dev)
            netif_stop_queue(card->dev);
      rc = lcs_stop_channels(card);
      if (rc == 0) {
            rc = lcs_start_channels(card);
            if (rc == 0) {
                  rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
                  if (rc == 0)
                        rc = lcs_startlan(card);
            }
      }
      if (rc == 0) {
            card->state = DEV_STATE_UP;
      } else {
            card->state = DEV_STATE_DOWN;
            card->write.state = CH_STATE_INIT;
            card->read.state =  CH_STATE_INIT;
      }
      return rc;
}

/**
 * LCS Stop card
 */
static int
lcs_stopcard(struct lcs_card *card)
{
      int rc;

      LCS_DBF_TEXT(3, setup, "stopcard");

      if (card->read.state != CH_STATE_STOPPED &&
          card->write.state != CH_STATE_STOPPED &&
          card->state == DEV_STATE_UP) {
            lcs_clear_multicast_list(card);
            rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
            rc = lcs_send_shutdown(card);
      }
      rc = lcs_stop_channels(card);
      card->state = DEV_STATE_DOWN;

      return rc;
}

/**
 * Kernel Thread helper functions for LGW initiated commands
 */
static void
lcs_start_kernel_thread(struct lcs_card *card)
{
      LCS_DBF_TEXT(5, trace, "krnthrd");
      if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
            kernel_thread(lcs_recovery, (void *) card, SIGCHLD);
#ifdef CONFIG_IP_MULTICAST
      if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
            kernel_thread(lcs_register_mc_addresses,
                        (void *) card, SIGCHLD);
#endif
}

/**
 * Process control frames.
 */
static void
lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
{
      LCS_DBF_TEXT(5, trace, "getctrl");
      if (cmd->initiator == LCS_INITIATOR_LGW) {
            switch(cmd->cmd_code) {
            case LCS_CMD_STARTUP:
            case LCS_CMD_STARTLAN:
                  lcs_schedule_recovery(card);
                  break;
            case LCS_CMD_STOPLAN:
                  PRINT_WARN("Stoplan for %s initiated by LGW.\n",
                              card->dev->name);
                  if (card->dev)
                        netif_carrier_off(card->dev);
                  break;
            default:
                  PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
                  break;
            }
      } else
            lcs_notify_lancmd_waiters(card, cmd);
}

/**
 * Unpack network packet.
 */
static void
lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
{
      struct sk_buff *skb;

      LCS_DBF_TEXT(5, trace, "getskb");
      if (card->dev == NULL ||
          card->state != DEV_STATE_UP)
            /* The card isn't up. Ignore the packet. */
            return;

      skb = dev_alloc_skb(skb_len);
      if (skb == NULL) {
            PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
                    card->dev->name);
            card->stats.rx_dropped++;
            return;
      }
      skb->dev = card->dev;
      memcpy(skb_put(skb, skb_len), skb_data, skb_len);
      skb->protocol =   card->lan_type_trans(skb, card->dev);
      card->stats.rx_bytes += skb_len;
      card->stats.rx_packets++;
      *((__u32 *)skb->cb) = ++card->pkt_seq;
      netif_rx(skb);
}

/**
 * LCS main routine to get packets and lancmd replies from the buffers
 */
static void
lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
{
      struct lcs_card *card;
      struct lcs_header *lcs_hdr;
      __u16 offset;

      LCS_DBF_TEXT(5, trace, "lcsgtpkt");
      lcs_hdr = (struct lcs_header *) buffer->data;
      if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
            LCS_DBF_TEXT(4, trace, "-eiogpkt");
            return;
      }
      card = (struct lcs_card *)
            ((char *) channel - offsetof(struct lcs_card, read));
      offset = 0;
      while (lcs_hdr->offset != 0) {
            if (lcs_hdr->offset <= 0 ||
                lcs_hdr->offset > LCS_IOBUFFERSIZE ||
                lcs_hdr->offset < offset) {
                  /* Offset invalid. */
                  card->stats.rx_length_errors++;
                  card->stats.rx_errors++;
                  return;
            }
            /* What kind of frame is it? */
            if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
                  /* Control frame. */
                  lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
            else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
                   lcs_hdr->type == LCS_FRAME_TYPE_TR ||
                   lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
                  /* Normal network packet. */
                  lcs_get_skb(card, (char *)(lcs_hdr + 1),
                            lcs_hdr->offset - offset -
                            sizeof(struct lcs_header));
            else
                  /* Unknown frame type. */
                  ; // FIXME: error message ?
            /* Proceed to next frame. */
            offset = lcs_hdr->offset;
            lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
            lcs_hdr = (struct lcs_header *) (buffer->data + offset);
      }
      /* The buffer is now empty. Make it ready again. */
      lcs_ready_buffer(&card->read, buffer);
}

/**
 * get network statistics for ifconfig and other user programs
 */
static struct net_device_stats *
lcs_getstats(struct net_device *dev)
{
      struct lcs_card *card;

      LCS_DBF_TEXT(4, trace, "netstats");
      card = (struct lcs_card *) dev->priv;
      return &card->stats;
}

/**
 * stop lcs device
 * This function will be called by user doing ifconfig xxx down
 */
static int
lcs_stop_device(struct net_device *dev)
{
      struct lcs_card *card;
      int rc;

      LCS_DBF_TEXT(2, trace, "stopdev");
      card   = (struct lcs_card *) dev->priv;
      netif_carrier_off(dev);
      netif_tx_disable(dev);
      dev->flags &= ~IFF_UP;
      wait_event(card->write.wait_q,
            (card->write.state != CH_STATE_RUNNING));
      rc = lcs_stopcard(card);
      if (rc)
            PRINT_ERR("Try it again!\n ");
      return rc;
}

/**
 * start lcs device and make it runnable
 * This function will be called by user doing ifconfig xxx up
 */
static int
lcs_open_device(struct net_device *dev)
{
      struct lcs_card *card;
      int rc;

      LCS_DBF_TEXT(2, trace, "opendev");
      card = (struct lcs_card *) dev->priv;
      /* initialize statistics */
      rc = lcs_detect(card);
      if (rc) {
            PRINT_ERR("LCS:Error in opening device!\n");

      } else {
            dev->flags |= IFF_UP;
            netif_carrier_on(dev);
            netif_wake_queue(dev);
            card->state = DEV_STATE_UP;
      }
      return rc;
}

/**
 * show function for portno called by cat or similar things
 */
static ssize_t
lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
{
        struct lcs_card *card;

      card = (struct lcs_card *)dev->driver_data;

        if (!card)
                return 0;

        return sprintf(buf, "%d\n", card->portno);
}

/**
 * store the value which is piped to file portno
 */
static ssize_t
lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
        struct lcs_card *card;
        int value;

      card = (struct lcs_card *)dev->driver_data;

        if (!card)
                return 0;

        sscanf(buf, "%u", &value);
        /* TODO: sanity checks */
        card->portno = value;

        return count;

}

static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);

static ssize_t
lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct ccwgroup_device *cgdev;

      cgdev = to_ccwgroupdev(dev);
      if (!cgdev)
            return -ENODEV;

      return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
}

static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);

static ssize_t
lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
{
      struct lcs_card *card;

      card = (struct lcs_card *)dev->driver_data;

      return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
}

static ssize_t
lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
{
        struct lcs_card *card;
        int value;

      card = (struct lcs_card *)dev->driver_data;

        if (!card)
                return 0;

        sscanf(buf, "%u", &value);
        /* TODO: sanity checks */
        card->lancmd_timeout = value;

        return count;

}

DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);

static ssize_t
lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
                  const char *buf, size_t count)
{
      struct lcs_card *card = dev->driver_data;
      char *tmp;
      int i;

      if (!card)
            return -EINVAL;
      if (card->state != DEV_STATE_UP)
            return -EPERM;
      i = simple_strtoul(buf, &tmp, 16);
      if (i == 1)
            lcs_schedule_recovery(card);
      return count;
}

static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);

static struct attribute * lcs_attrs[] = {
      &dev_attr_portno.attr,
      &dev_attr_type.attr,
      &dev_attr_lancmd_timeout.attr,
      &dev_attr_recover.attr,
      NULL,
};

static struct attribute_group lcs_attr_group = {
      .attrs = lcs_attrs,
};

/**
 * lcs_probe_device is called on establishing a new ccwgroup_device.
 */
static int
lcs_probe_device(struct ccwgroup_device *ccwgdev)
{
      struct lcs_card *card;
      int ret;

      if (!get_device(&ccwgdev->dev))
            return -ENODEV;

      LCS_DBF_TEXT(2, setup, "add_dev");
        card = lcs_alloc_card();
        if (!card) {
                PRINT_ERR("Allocation of lcs card failed\n");
            put_device(&ccwgdev->dev);
                return -ENOMEM;
        }
      ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
      if (ret) {
                PRINT_ERR("Creating attributes failed");
            lcs_free_card(card);
            put_device(&ccwgdev->dev);
            return ret;
        }
      ccwgdev->dev.driver_data = card;
      ccwgdev->cdev[0]->handler = lcs_irq;
      ccwgdev->cdev[1]->handler = lcs_irq;
      card->gdev = ccwgdev;
      INIT_WORK(&card->kernel_thread_starter,
              (void *) lcs_start_kernel_thread, card);
      card->thread_start_mask = 0;
      card->thread_allowed_mask = 0;
      card->thread_running_mask = 0;
        return 0;
}

static int
lcs_register_netdev(struct ccwgroup_device *ccwgdev)
{
      struct lcs_card *card;

      LCS_DBF_TEXT(2, setup, "regnetdv");
      card = (struct lcs_card *)ccwgdev->dev.driver_data;
      if (card->dev->reg_state != NETREG_UNINITIALIZED)
            return 0;
      SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
      return register_netdev(card->dev);
}

/**
 * lcs_new_device will be called by setting the group device online.
 */

static int
lcs_new_device(struct ccwgroup_device *ccwgdev)
{
      struct  lcs_card *card;
      struct net_device *dev=NULL;
      enum lcs_dev_states recover_state;
      int rc;

      card = (struct lcs_card *)ccwgdev->dev.driver_data;
      if (!card)
            return -ENODEV;

      LCS_DBF_TEXT(2, setup, "newdev");
      LCS_DBF_HEX(3, setup, &card, sizeof(void*));
      card->read.ccwdev  = ccwgdev->cdev[0];
      card->write.ccwdev = ccwgdev->cdev[1];

      recover_state = card->state;
      ccw_device_set_online(card->read.ccwdev);
      ccw_device_set_online(card->write.ccwdev);

      LCS_DBF_TEXT(3, setup, "lcsnewdv");

      lcs_setup_card(card);
      rc = lcs_detect(card);
      if (rc) {
            LCS_DBF_TEXT(2, setup, "dtctfail");
            PRINT_WARN("Detection of LCS card failed with return code "
                     "%d (0x%x)\n", rc, rc);
            lcs_stopcard(card);
            goto out;
      }
      if (card->dev) {
            LCS_DBF_TEXT(2, setup, "samedev");
            LCS_DBF_HEX(3, setup, &card, sizeof(void*));
            goto netdev_out;
      }
      switch (card->lan_type) {
#ifdef CONFIG_NET_ETHERNET
      case LCS_FRAME_TYPE_ENET:
            card->lan_type_trans = eth_type_trans;
            dev = alloc_etherdev(0);
            break;
#endif
#ifdef CONFIG_TR
      case LCS_FRAME_TYPE_TR:
            card->lan_type_trans = tr_type_trans;
            dev = alloc_trdev(0);
            break;
#endif
#ifdef CONFIG_FDDI
      case LCS_FRAME_TYPE_FDDI:
            card->lan_type_trans = fddi_type_trans;
            dev = alloc_fddidev(0);
            break;
#endif
      default:
            LCS_DBF_TEXT(3, setup, "errinit");
            PRINT_ERR("LCS: Initialization failed\n");
            PRINT_ERR("LCS: No device found!\n");
            goto out;
      }
      if (!dev)
            goto out;
      card->dev = dev;
      card->dev->priv = card;
      card->dev->open = lcs_open_device;
      card->dev->stop = lcs_stop_device;
      card->dev->hard_start_xmit = lcs_start_xmit;
      card->dev->get_stats = lcs_getstats;
      SET_MODULE_OWNER(dev);
      memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
#ifdef CONFIG_IP_MULTICAST
      if (!lcs_check_multicast_support(card))
            card->dev->set_multicast_list = lcs_set_multicast_list;
#endif
netdev_out:
      lcs_set_allowed_threads(card,0xffffffff);
      if (recover_state == DEV_STATE_RECOVER) {
            lcs_set_multicast_list(card->dev);
            card->dev->flags |= IFF_UP;
            netif_carrier_on(card->dev);
            netif_wake_queue(card->dev);
            card->state = DEV_STATE_UP;
      } else {
            lcs_stopcard(card);
      }

      if (lcs_register_netdev(ccwgdev) != 0)
            goto out;

      /* Print out supported assists: IPv6 */
      PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
               (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
               "with" : "without");
      /* Print out supported assist: Multicast */
      PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
               (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
               "with" : "without");
      return 0;
out:

      ccw_device_set_offline(card->read.ccwdev);
      ccw_device_set_offline(card->write.ccwdev);
      return -ENODEV;
}

/**
 * lcs_shutdown_device, called when setting the group device offline.
 */
static int
__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
{
      struct lcs_card *card;
      enum lcs_dev_states recover_state;
      int ret;

      LCS_DBF_TEXT(3, setup, "shtdndev");
      card = (struct lcs_card *)ccwgdev->dev.driver_data;
      if (!card)
            return -ENODEV;
      if (recovery_mode == 0) {
            lcs_set_allowed_threads(card, 0);
            if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
                  return -ERESTARTSYS;
      }
      LCS_DBF_HEX(3, setup, &card, sizeof(void*));
      recover_state = card->state;

      ret = lcs_stop_device(card->dev);
      ret = ccw_device_set_offline(card->read.ccwdev);
      ret = ccw_device_set_offline(card->write.ccwdev);
      if (recover_state == DEV_STATE_UP) {
            card->state = DEV_STATE_RECOVER;
      }
      if (ret)
            return ret;
      return 0;
}

static int
lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
{
      return __lcs_shutdown_device(ccwgdev, 0);
}

/**
 * drive lcs recovery after startup and startlan initiated by Lan Gateway
 */
static int
lcs_recovery(void *ptr)
{
      struct lcs_card *card;
      struct ccwgroup_device *gdev;
        int rc;

      card = (struct lcs_card *) ptr;
      daemonize("lcs_recover");

      LCS_DBF_TEXT(4, trace, "recover1");
      if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
            return 0;
      LCS_DBF_TEXT(4, trace, "recover2");
      gdev = card->gdev;
      PRINT_WARN("Recovery of device %s started...\n", gdev->dev.bus_id);
      rc = __lcs_shutdown_device(gdev, 1);
      rc = lcs_new_device(gdev);
      if (!rc)
            PRINT_INFO("Device %s successfully recovered!\n",
                        card->dev->name);
      else
            PRINT_INFO("Device %s could not be recovered!\n",
                        card->dev->name);
      lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
      return 0;
}

/**
 * lcs_remove_device, free buffers and card
 */
static void
lcs_remove_device(struct ccwgroup_device *ccwgdev)
{
      struct lcs_card *card;

      card = (struct lcs_card *)ccwgdev->dev.driver_data;
      if (!card)
            return;

      PRINT_INFO("Removing lcs group device ....\n");
      LCS_DBF_TEXT(3, setup, "remdev");
      LCS_DBF_HEX(3, setup, &card, sizeof(void*));
      if (ccwgdev->state == CCWGROUP_ONLINE) {
            lcs_shutdown_device(ccwgdev);
      }
      if (card->dev)
            unregister_netdev(card->dev);
      sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
      lcs_cleanup_card(card);
      lcs_free_card(card);
      put_device(&ccwgdev->dev);
}

/**
 * LCS ccwgroup driver registration
 */
static struct ccwgroup_driver lcs_group_driver = {
      .owner       = THIS_MODULE,
      .name        = "lcs",
      .max_slaves  = 2,
      .driver_id   = 0xD3C3E2,
      .probe       = lcs_probe_device,
      .remove      = lcs_remove_device,
      .set_online  = lcs_new_device,
      .set_offline = lcs_shutdown_device,
};

/**
 *  LCS Module/Kernel initialization function
 */
static int
__init lcs_init_module(void)
{
      int rc;

      PRINT_INFO("Loading %s\n",version);
      rc = lcs_register_debug_facility();
      LCS_DBF_TEXT(0, setup, "lcsinit");
      if (rc) {
            PRINT_ERR("Initialization failed\n");
            return rc;
      }

      rc = register_cu3088_discipline(&lcs_group_driver);
      if (rc) {
            PRINT_ERR("Initialization failed\n");
            return rc;
      }
      return 0;
}


/**
 *  LCS module cleanup function
 */
static void
__exit lcs_cleanup_module(void)
{
      PRINT_INFO("Terminating lcs module.\n");
      LCS_DBF_TEXT(0, trace, "cleanup");
      unregister_cu3088_discipline(&lcs_group_driver);
      lcs_unregister_debug_facility();
}

module_init(lcs_init_module);
module_exit(lcs_cleanup_module);

MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
MODULE_LICENSE("GPL");


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