litmus-rt-ext-res.git - LITMUS^RT with extended reservations for Forbidden Zones paper @ RTAS'20

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path: root/arch/arm/include/asm/topology.h

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Diffstat (limited to 'arch/arm/include/asm/topology.h')

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1 files changed, 1 insertions, 1 deletions


diff --git a/arch/arm/include/asm/topology.h b/arch/arm/include/asm/topology.h index 2fe85fff5cca..370f7a732900 100644 --- a/arch/arm/include/asm/topology.h +++ b/arch/arm/include/asm/topology.h
@@ -18,7 +18,7 @@ extern struct cputopo_arm cpu_topology[NR_CPUS];
18	#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)	18	#define topology_physical_package_id(cpu) (cpu_topology[cpu].socket_id)
19	#define topology_core_id(cpu) (cpu_topology[cpu].core_id)	19	#define topology_core_id(cpu) (cpu_topology[cpu].core_id)
20	#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)	20	#define topology_core_cpumask(cpu) (&cpu_topology[cpu].core_sibling)
21	#define topology_thread_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)	21	#define topology_sibling_cpumask(cpu) (&cpu_topology[cpu].thread_sibling)
22		22
23	void init_cpu_topology(void);	23	void init_cpu_topology(void);
24	void store_cpu_topology(unsigned int cpuid);	24	void store_cpu_topology(unsigned int cpuid);

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/*
 *    ESCON CLAW network driver
 *
 *  Linux for zSeries version
 *    Copyright IBM Corp. 2002, 2009
 *  Author(s) Original code written by:
 *		Kazuo Iimura <iimura@jp.ibm.com>
 *   	      Rewritten by
 *		Andy Richter <richtera@us.ibm.com>
 *		Marc Price <mwprice@us.ibm.com>
 *
 *    sysfs parms:
 *   group x.x.rrrr,x.x.wwww
 *   read_buffer nnnnnnn
 *   write_buffer nnnnnn
 *   host_name  aaaaaaaa
 *   adapter_name aaaaaaaa
 *   api_type    aaaaaaaa
 *
 *  eg.
 *   group  0.0.0200 0.0.0201
 *   read_buffer 25
 *   write_buffer 20
 *   host_name LINUX390
 *   adapter_name RS6K
 *   api_type     TCPIP
 *
 *  where
 *
 *   The device id is decided by the order entries
 *   are added to the group the first is claw0 the second claw1
 *   up to CLAW_MAX_DEV
 *
 *   rrrr     -	the first of 2 consecutive device addresses used for the
 *		CLAW protocol.
 *		The specified address is always used as the input (Read)
 *		channel and the next address is used as the output channel.
 *
 *   wwww     -	the second of 2 consecutive device addresses used for
 *		the CLAW protocol.
 *              The specified address is always used as the output
 *		channel and the previous address is used as the input channel.
 *
 *   read_buffer	-       specifies number of input buffers to allocate.
 *   write_buffer       -       specifies number of output buffers to allocate.
 *   host_name          -       host name
 *   adaptor_name       -       adaptor name
 *   api_type           -       API type TCPIP or API will be sent and expected
 *				as ws_name
 *
 *   Note the following requirements:
 *   1)  host_name must match the configured adapter_name on the remote side
 *   2)  adaptor_name must match the configured host name on the remote side
 *
 *  Change History
 *    1.00  Initial release shipped
 *    1.10  Changes for Buffer allocation
 *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
 *    1.25  Added Packing support
 *    1.5
 */

#define KMSG_COMPONENT "claw"

#include <asm/ccwdev.h>
#include <asm/ccwgroup.h>
#include <asm/debug.h>
#include <asm/idals.h>
#include <asm/io.h>
#include <linux/bitops.h>
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/if_arp.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/ip.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/proc_fs.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/tcp.h>
#include <linux/timer.h>
#include <linux/types.h>

#include "claw.h"

/*
   CLAW uses the s390dbf file system  see claw_trace and claw_setup
*/

static char version[] __initdata = "CLAW driver";
static char debug_buffer[255];
/**
 * Debug Facility Stuff
 */
static debug_info_t *claw_dbf_setup;
static debug_info_t *claw_dbf_trace;

/**
 *  CLAW Debug Facility functions
 */
static void
claw_unregister_debug_facility(void)
{
	if (claw_dbf_setup)
		debug_unregister(claw_dbf_setup);
	if (claw_dbf_trace)
		debug_unregister(claw_dbf_trace);
}

static int
claw_register_debug_facility(void)
{
	claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
	claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
	if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
		claw_unregister_debug_facility();
		return -ENOMEM;
	}
	debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
	debug_set_level(claw_dbf_setup, 2);
	debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
	debug_set_level(claw_dbf_trace, 2);
	return 0;
}

static inline void
claw_set_busy(struct net_device *dev)
{
 ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
}

static inline void
claw_clear_busy(struct net_device *dev)
{
	clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
	netif_wake_queue(dev);
}

static inline int
claw_check_busy(struct net_device *dev)
{
	return ((struct claw_privbk *) dev->ml_priv)->tbusy;
}

static inline void
claw_setbit_busy(int nr,struct net_device *dev)
{
	netif_stop_queue(dev);
	set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
}

static inline void
claw_clearbit_busy(int nr,struct net_device *dev)
{
	clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
	netif_wake_queue(dev);
}

static inline int
claw_test_and_setbit_busy(int nr,struct net_device *dev)
{
	netif_stop_queue(dev);
	return test_and_set_bit(nr,
		(void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
}


/* Functions for the DEV methods */

static int claw_probe(struct ccwgroup_device *cgdev);
static void claw_remove_device(struct ccwgroup_device *cgdev);
static void claw_purge_skb_queue(struct sk_buff_head *q);
static int claw_new_device(struct ccwgroup_device *cgdev);
static int claw_shutdown_device(struct ccwgroup_device *cgdev);
static int claw_tx(struct sk_buff *skb, struct net_device *dev);
static int claw_change_mtu( struct net_device *dev, int new_mtu);
static int claw_open(struct net_device *dev);
static void claw_irq_handler(struct ccw_device *cdev,
	unsigned long intparm, struct irb *irb);
static void claw_irq_tasklet ( unsigned long data );
static int claw_release(struct net_device *dev);
static void claw_write_retry ( struct chbk * p_ch );
static void claw_write_next ( struct chbk * p_ch );
static void claw_timer ( struct chbk * p_ch );

/* Functions */
static int add_claw_reads(struct net_device *dev,
	struct ccwbk* p_first, struct ccwbk* p_last);
static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
static int find_link(struct net_device *dev, char *host_name, char *ws_name );
static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
static int init_ccw_bk(struct net_device *dev);
static void probe_error( struct ccwgroup_device *cgdev);
static struct net_device_stats *claw_stats(struct net_device *dev);
static int pages_to_order_of_mag(int num_of_pages);
static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
/* sysfs Functions */
static ssize_t claw_hname_show(struct device *dev,
	struct device_attribute *attr, char *buf);
static ssize_t claw_hname_write(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count);
static ssize_t claw_adname_show(struct device *dev,
	struct device_attribute *attr, char *buf);
static ssize_t claw_adname_write(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count);
static ssize_t claw_apname_show(struct device *dev,
	struct device_attribute *attr, char *buf);
static ssize_t claw_apname_write(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count);
static ssize_t claw_wbuff_show(struct device *dev,
	struct device_attribute *attr, char *buf);
static ssize_t claw_wbuff_write(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count);
static ssize_t claw_rbuff_show(struct device *dev,
	struct device_attribute *attr, char *buf);
static ssize_t claw_rbuff_write(struct device *dev,
	struct device_attribute *attr,
	const char *buf, size_t count);

/*   Functions for System Validate  */
static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
       __u8 correlator, __u8 rc , char *local_name, char *remote_name);
static int claw_snd_conn_req(struct net_device *dev, __u8 link);
static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
static int claw_snd_sys_validate_rsp(struct net_device *dev,
        struct clawctl * p_ctl, __u32 return_code);
static int claw_strt_conn_req(struct net_device *dev );
static void claw_strt_read(struct net_device *dev, int lock);
static void claw_strt_out_IO(struct net_device *dev);
static void claw_free_wrt_buf(struct net_device *dev);

/* Functions for unpack reads   */
static void unpack_read(struct net_device *dev);

static int claw_pm_prepare(struct ccwgroup_device *gdev)
{
	return -EPERM;
}

/* the root device for claw group devices */
static struct device *claw_root_dev;

/* ccwgroup table  */

static struct ccwgroup_driver claw_group_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "claw",
	},
	.setup	     = claw_probe,
	.remove      = claw_remove_device,
	.set_online  = claw_new_device,
	.set_offline = claw_shutdown_device,
	.prepare     = claw_pm_prepare,
};

static struct ccw_device_id claw_ids[] = {
	{CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
	{},
};
MODULE_DEVICE_TABLE(ccw, claw_ids);

static struct ccw_driver claw_ccw_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "claw",
	},
	.ids	= claw_ids,
	.probe	= ccwgroup_probe_ccwdev,
	.remove	= ccwgroup_remove_ccwdev,
	.int_class = IRQIO_CLW,
};

static ssize_t claw_driver_group_store(struct device_driver *ddrv,
				       const char *buf,	size_t count)
{
	int err;
	err = ccwgroup_create_dev(claw_root_dev, &claw_group_driver, 2, buf);
	return err ? err : count;
}
static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);

static struct attribute *claw_drv_attrs[] = {
	&driver_attr_group.attr,
	NULL,
};
static struct attribute_group claw_drv_attr_group = {
	.attrs = claw_drv_attrs,
};
static const struct attribute_group *claw_drv_attr_groups[] = {
	&claw_drv_attr_group,
	NULL,
};

/*
*       Key functions
*/

/*-------------------------------------------------------------------*
 *   claw_tx                                                         *
 *-------------------------------------------------------------------*/

static int
claw_tx(struct sk_buff *skb, struct net_device *dev)
{
        int             rc;
	struct claw_privbk *privptr = dev->ml_priv;
	unsigned long saveflags;
        struct chbk *p_ch;

	CLAW_DBF_TEXT(4, trace, "claw_tx");
	p_ch = &privptr->channel[WRITE_CHANNEL];
        spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
        rc=claw_hw_tx( skb, dev, 1 );
        spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
	CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
	if (rc)
		rc = NETDEV_TX_BUSY;
	else
		rc = NETDEV_TX_OK;
        return rc;
}   /*  end of claw_tx */

/*------------------------------------------------------------------*
 *  pack the collect queue into an skb and return it                *
 *   If not packing just return the top skb from the queue          *
 *------------------------------------------------------------------*/

static struct sk_buff *
claw_pack_skb(struct claw_privbk *privptr)
{
	struct sk_buff *new_skb,*held_skb;
	struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
	struct claw_env  *p_env = privptr->p_env;
	int	pkt_cnt,pk_ind,so_far;

	new_skb = NULL;		/* assume no dice */
	pkt_cnt = 0;
	CLAW_DBF_TEXT(4, trace, "PackSKBe");
	if (!skb_queue_empty(&p_ch->collect_queue)) {
	/* some data */
		held_skb = skb_dequeue(&p_ch->collect_queue);
		if (held_skb)
			dev_kfree_skb_any(held_skb);
		else
			return NULL;
		if (p_env->packing != DO_PACKED)
			return held_skb;
		/* get a new SKB we will pack at least one */
		new_skb = dev_alloc_skb(p_env->write_size);
		if (new_skb == NULL) {
			atomic_inc(&held_skb->users);
			skb_queue_head(&p_ch->collect_queue,held_skb);
			return NULL;
		}
		/* we have packed packet and a place to put it  */
		pk_ind = 1;
		so_far = 0;
		new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
		while ((pk_ind) && (held_skb != NULL)) {
			if (held_skb->len+so_far <= p_env->write_size-8) {
				memcpy(skb_put(new_skb,held_skb->len),
					held_skb->data,held_skb->len);
				privptr->stats.tx_packets++;
				so_far += held_skb->len;
				pkt_cnt++;
				dev_kfree_skb_any(held_skb);
				held_skb = skb_dequeue(&p_ch->collect_queue);
				if (held_skb)
					atomic_dec(&held_skb->users);
			} else {
				pk_ind = 0;
				atomic_inc(&held_skb->users);
				skb_queue_head(&p_ch->collect_queue,held_skb);
			}
		}
	}
	CLAW_DBF_TEXT(4, trace, "PackSKBx");
	return new_skb;
}

/*-------------------------------------------------------------------*
 *   claw_change_mtu                                                 *
 *                                                                   *
 *-------------------------------------------------------------------*/

static int
claw_change_mtu(struct net_device *dev, int new_mtu)
{
	struct claw_privbk *privptr = dev->ml_priv;
	int buff_size;
	CLAW_DBF_TEXT(4, trace, "setmtu");
	buff_size = privptr->p_env->write_size;
        if ((new_mtu < 60) || (new_mtu > buff_size)) {
                return -EINVAL;
        }
        dev->mtu = new_mtu;
        return 0;
}  /*   end of claw_change_mtu */


/*-------------------------------------------------------------------*
 *   claw_open                                                       *
 *                                                                   *
 *-------------------------------------------------------------------*/
static int
claw_open(struct net_device *dev)
{

        int     rc;
        int     i;
        unsigned long       saveflags=0;
        unsigned long       parm;
        struct claw_privbk  *privptr;
	DECLARE_WAITQUEUE(wait, current);
        struct timer_list  timer;
        struct ccwbk *p_buf;

	CLAW_DBF_TEXT(4, trace, "open");
	privptr = (struct claw_privbk *)dev->ml_priv;
        /*   allocate and initialize CCW blocks */
	if (privptr->buffs_alloc == 0) {
	        rc=init_ccw_bk(dev);
        	if (rc) {
			CLAW_DBF_TEXT(2, trace, "openmem");
                	return -ENOMEM;
        	}
	}
        privptr->system_validate_comp=0;
        privptr->release_pend=0;
	if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
		privptr->p_env->read_size=DEF_PACK_BUFSIZE;
		privptr->p_env->write_size=DEF_PACK_BUFSIZE;
		privptr->p_env->packing=PACKING_ASK;
	} else {
		privptr->p_env->packing=0;
		privptr->p_env->read_size=CLAW_FRAME_SIZE;
		privptr->p_env->write_size=CLAW_FRAME_SIZE;
	}
        claw_set_busy(dev);
	tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
		(unsigned long) &privptr->channel[READ_CHANNEL]);
        for ( i = 0; i < 2;  i++) {
		CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
                init_waitqueue_head(&privptr->channel[i].wait);
		/* skb_queue_head_init(&p_ch->io_queue); */
		if (i == WRITE_CHANNEL)
			skb_queue_head_init(
				&privptr->channel[WRITE_CHANNEL].collect_queue);
                privptr->channel[i].flag_a = 0;
                privptr->channel[i].IO_active = 0;
                privptr->channel[i].flag  &= ~CLAW_TIMER;
                init_timer(&timer);
                timer.function = (void *)claw_timer;
                timer.data = (unsigned long)(&privptr->channel[i]);
                timer.expires = jiffies + 15*HZ;
                add_timer(&timer);
                spin_lock_irqsave(get_ccwdev_lock(
			privptr->channel[i].cdev), saveflags);
                parm = (unsigned long) &privptr->channel[i];
                privptr->channel[i].claw_state = CLAW_START_HALT_IO;
		rc = 0;
		add_wait_queue(&privptr->channel[i].wait, &wait);
                rc = ccw_device_halt(
			(struct ccw_device *)privptr->channel[i].cdev,parm);
                set_current_state(TASK_INTERRUPTIBLE);
                spin_unlock_irqrestore(
			get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
                schedule();
                remove_wait_queue(&privptr->channel[i].wait, &wait);
                if(rc != 0)
                        ccw_check_return_code(privptr->channel[i].cdev, rc);
                if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
                        del_timer(&timer);
        }
	if ((((privptr->channel[READ_CHANNEL].last_dstat |
		privptr->channel[WRITE_CHANNEL].last_dstat) &
           ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
	   (((privptr->channel[READ_CHANNEL].flag |
		privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
		dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
			"%s: remote side is not ready\n", dev->name);
		CLAW_DBF_TEXT(2, trace, "notrdy");

                for ( i = 0; i < 2;  i++) {
                        spin_lock_irqsave(
				get_ccwdev_lock(privptr->channel[i].cdev),
				saveflags);
                        parm = (unsigned long) &privptr->channel[i];
                        privptr->channel[i].claw_state = CLAW_STOP;
                        rc = ccw_device_halt(
				(struct ccw_device *)&privptr->channel[i].cdev,
				parm);
                        spin_unlock_irqrestore(
				get_ccwdev_lock(privptr->channel[i].cdev),
				saveflags);
                        if (rc != 0) {
                                ccw_check_return_code(
					privptr->channel[i].cdev, rc);
                        }
                }
                free_pages((unsigned long)privptr->p_buff_ccw,
			(int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
                if (privptr->p_env->read_size < PAGE_SIZE) {
                        free_pages((unsigned long)privptr->p_buff_read,
			       (int)pages_to_order_of_mag(
			       		privptr->p_buff_read_num));
                }
                else {
                        p_buf=privptr->p_read_active_first;
                        while (p_buf!=NULL) {
                                free_pages((unsigned long)p_buf->p_buffer,
				      (int)pages_to_order_of_mag(
				      	privptr->p_buff_pages_perread ));
                                p_buf=p_buf->next;
                        }
                }
                if (privptr->p_env->write_size < PAGE_SIZE ) {
                        free_pages((unsigned long)privptr->p_buff_write,
			     (int)pages_to_order_of_mag(
			     	privptr->p_buff_write_num));
                }
                else {
                        p_buf=privptr->p_write_active_first;
                        while (p_buf!=NULL) {
                                free_pages((unsigned long)p_buf->p_buffer,
				     (int)pages_to_order_of_mag(
				     	privptr->p_buff_pages_perwrite ));
                                p_buf=p_buf->next;
                        }
                }
		privptr->buffs_alloc = 0;
		privptr->channel[READ_CHANNEL].flag = 0x00;
		privptr->channel[WRITE_CHANNEL].flag = 0x00;
                privptr->p_buff_ccw=NULL;
                privptr->p_buff_read=NULL;
                privptr->p_buff_write=NULL;
                claw_clear_busy(dev);
		CLAW_DBF_TEXT(2, trace, "open EIO");
                return -EIO;
        }

        /*   Send SystemValidate command */

        claw_clear_busy(dev);
	CLAW_DBF_TEXT(4, trace, "openok");
        return 0;
}    /*     end of claw_open    */

/*-------------------------------------------------------------------*
*                                                                    *
*       claw_irq_handler                                             *
*                                                                    *
*--------------------------------------------------------------------*/
static void
claw_irq_handler(struct ccw_device *cdev,
	unsigned long intparm, struct irb *irb)
{
        struct chbk *p_ch = NULL;
        struct claw_privbk *privptr = NULL;
        struct net_device *dev = NULL;
        struct claw_env  *p_env;
        struct chbk *p_ch_r=NULL;

	CLAW_DBF_TEXT(4, trace, "clawirq");
        /* Bypass all 'unsolicited interrupts' */
	privptr = dev_get_drvdata(&cdev->dev);
	if (!privptr) {
		dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
			" IRQ, c-%02x d-%02x\n",
			irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
		CLAW_DBF_TEXT(2, trace, "badirq");
                return;
        }

	/* Try to extract channel from driver data. */
	if (privptr->channel[READ_CHANNEL].cdev == cdev)
		p_ch = &privptr->channel[READ_CHANNEL];
	else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
		p_ch = &privptr->channel[WRITE_CHANNEL];
	else {
		dev_warn(&cdev->dev, "The device is not a CLAW device\n");
		CLAW_DBF_TEXT(2, trace, "badchan");
		return;
	}
	CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);

	dev = (struct net_device *) (p_ch->ndev);
        p_env=privptr->p_env;

	/* Copy interruption response block. */
	memcpy(p_ch->irb, irb, sizeof(struct irb));

	/* Check for good subchannel return code, otherwise info message */
	if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
		dev_info(&cdev->dev,
			"%s: subchannel check for device: %04x -"
			" Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
                        dev->name, p_ch->devno,
			irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
			irb->scsw.cmd.cpa);
		CLAW_DBF_TEXT(2, trace, "chanchk");
                /* return; */
        }

        /* Check the reason-code of a unit check */
	if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
                ccw_check_unit_check(p_ch, irb->ecw[0]);

        /* State machine to bring the connection up, down and to restart */
	p_ch->last_dstat = irb->scsw.cmd.dstat;

        switch (p_ch->claw_state) {
	case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
		if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
		(p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
		(p_ch->irb->scsw.cmd.stctl ==
		(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
			return;
		wake_up(&p_ch->wait);   /* wake up claw_release */
		CLAW_DBF_TEXT(4, trace, "stop");
		return;
	case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
		if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
		(p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
		(p_ch->irb->scsw.cmd.stctl ==
		(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
			CLAW_DBF_TEXT(4, trace, "haltio");
			return;
		}
		if (p_ch->flag == CLAW_READ) {
			p_ch->claw_state = CLAW_START_READ;
			wake_up(&p_ch->wait); /* wake claw_open (READ)*/
		} else if (p_ch->flag == CLAW_WRITE) {
			p_ch->claw_state = CLAW_START_WRITE;
			/*      send SYSTEM_VALIDATE                    */
			claw_strt_read(dev, LOCK_NO);
			claw_send_control(dev,
				SYSTEM_VALIDATE_REQUEST,
				0, 0, 0,
				p_env->host_name,
				p_env->adapter_name);
		} else {
			dev_warn(&cdev->dev, "The CLAW device received"
				" an unexpected IRQ, "
				"c-%02x d-%02x\n",
				irb->scsw.cmd.cstat,
				irb->scsw.cmd.dstat);
			return;
			}
		CLAW_DBF_TEXT(4, trace, "haltio");
		return;
	case CLAW_START_READ:
		CLAW_DBF_TEXT(4, trace, "ReadIRQ");
		if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
			clear_bit(0, (void *)&p_ch->IO_active);
			if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
			    (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
			    (p_ch->irb->ecw[0])        == 0) {
				privptr->stats.rx_errors++;
				dev_info(&cdev->dev,
					"%s: Restart is required after remote "
					"side recovers \n",
					dev->name);
			}
			CLAW_DBF_TEXT(4, trace, "notrdy");
			return;
		}
		if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
			(p_ch->irb->scsw.cmd.dstat == 0)) {
			if (test_and_set_bit(CLAW_BH_ACTIVE,
				(void *)&p_ch->flag_a) == 0)
				tasklet_schedule(&p_ch->tasklet);
			else
				CLAW_DBF_TEXT(4, trace, "PCINoBH");
			CLAW_DBF_TEXT(4, trace, "PCI_read");
			return;
		}
		if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
		 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
		 (p_ch->irb->scsw.cmd.stctl ==
		 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
			CLAW_DBF_TEXT(4, trace, "SPend_rd");
			return;
		}
		clear_bit(0, (void *)&p_ch->IO_active);
		claw_clearbit_busy(TB_RETRY, dev);
		if (test_and_set_bit(CLAW_BH_ACTIVE,
			(void *)&p_ch->flag_a) == 0)
			tasklet_schedule(&p_ch->tasklet);
		else
			CLAW_DBF_TEXT(4, trace, "RdBHAct");
		CLAW_DBF_TEXT(4, trace, "RdIRQXit");
		return;
	case CLAW_START_WRITE:
		if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
			dev_info(&cdev->dev,
				"%s: Unit Check Occurred in "
				"write channel\n", dev->name);
			clear_bit(0, (void *)&p_ch->IO_active);
			if (p_ch->irb->ecw[0] & 0x80) {
				dev_info(&cdev->dev,
					"%s: Resetting Event "
					"occurred:\n", dev->name);
				init_timer(&p_ch->timer);
				p_ch->timer.function =
					(void *)claw_write_retry;
				p_ch->timer.data = (unsigned long)p_ch;
				p_ch->timer.expires = jiffies + 10*HZ;
				add_timer(&p_ch->timer);
				dev_info(&cdev->dev,
					"%s: write connection "
					"restarting\n", dev->name);
			}
			CLAW_DBF_TEXT(4, trace, "rstrtwrt");
			return;
		}
		if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
			clear_bit(0, (void *)&p_ch->IO_active);
			dev_info(&cdev->dev,
				"%s: Unit Exception "
				"occurred in write channel\n",
				dev->name);
		}
		if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
		(p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
		(p_ch->irb->scsw.cmd.stctl ==
		(SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
			CLAW_DBF_TEXT(4, trace, "writeUE");
			return;
		}
		clear_bit(0, (void *)&p_ch->IO_active);
		if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
			claw_write_next(p_ch);
			claw_clearbit_busy(TB_TX, dev);
			claw_clear_busy(dev);
		}
		p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
		if (test_and_set_bit(CLAW_BH_ACTIVE,
			(void *)&p_ch_r->flag_a) == 0)
			tasklet_schedule(&p_ch_r->tasklet);
		CLAW_DBF_TEXT(4, trace, "StWtExit");
		return;
	default:
		dev_warn(&cdev->dev,
			"The CLAW device for %s received an unexpected IRQ\n",
			 dev->name);
		CLAW_DBF_TEXT(2, trace, "badIRQ");
		return;
        }

}       /*   end of claw_irq_handler    */


/*-------------------------------------------------------------------*
*       claw_irq_tasklet                                             *
*                                                                    *
*--------------------------------------------------------------------*/
static void
claw_irq_tasklet ( unsigned long data )
{
	struct chbk * p_ch;
        struct net_device  *dev;

	p_ch = (struct chbk *) data;
        dev = (struct net_device *)p_ch->ndev;
	CLAW_DBF_TEXT(4, trace, "IRQtask");
        unpack_read(dev);
        clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
	CLAW_DBF_TEXT(4, trace, "TskletXt");
        return;
}       /*    end of claw_irq_bh    */

/*-------------------------------------------------------------------*
*       claw_release                                                 *
*                                                                    *
*--------------------------------------------------------------------*/
static int
claw_release(struct net_device *dev)
{
        int                rc;
        int                i;
        unsigned long      saveflags;
        unsigned long      parm;
        struct claw_privbk *privptr;
        DECLARE_WAITQUEUE(wait, current);
        struct ccwbk*             p_this_ccw;
        struct ccwbk*             p_buf;

	if (!dev)
                return 0;
	privptr = (struct claw_privbk *)dev->ml_priv;
        if (!privptr)
                return 0;
	CLAW_DBF_TEXT(4, trace, "release");
        privptr->release_pend=1;
        claw_setbit_busy(TB_STOP,dev);
        for ( i = 1; i >=0 ;  i--) {
                spin_lock_irqsave(
			get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
	     /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
 		privptr->channel[i].claw_state = CLAW_STOP;
                privptr->channel[i].IO_active = 0;
                parm = (unsigned long) &privptr->channel[i];
		if (i == WRITE_CHANNEL)
			claw_purge_skb_queue(
				&privptr->channel[WRITE_CHANNEL].collect_queue);
                rc = ccw_device_halt (privptr->channel[i].cdev, parm);
	        if (privptr->system_validate_comp==0x00)  /* never opened? */
                   init_waitqueue_head(&privptr->channel[i].wait);
                add_wait_queue(&privptr->channel[i].wait, &wait);
                set_current_state(TASK_INTERRUPTIBLE);
	        spin_unlock_irqrestore(
			get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
	        schedule();
	        remove_wait_queue(&privptr->channel[i].wait, &wait);
	        if (rc != 0) {
                        ccw_check_return_code(privptr->channel[i].cdev, rc);
                }
        }
	if (privptr->pk_skb != NULL) {
		dev_kfree_skb_any(privptr->pk_skb);
		privptr->pk_skb = NULL;
	}
	if(privptr->buffs_alloc != 1) {
		CLAW_DBF_TEXT(4, trace, "none2fre");
		return 0;
	}
	CLAW_DBF_TEXT(4, trace, "freebufs");
	if (privptr->p_buff_ccw != NULL) {
        	free_pages((unsigned long)privptr->p_buff_ccw,
	        	(int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
	}
	CLAW_DBF_TEXT(4, trace, "freeread");
        if (privptr->p_env->read_size < PAGE_SIZE) {
	    if (privptr->p_buff_read != NULL) {
                free_pages((unsigned long)privptr->p_buff_read,
		      (int)pages_to_order_of_mag(privptr->p_buff_read_num));
		}
        }
        else {
                p_buf=privptr->p_read_active_first;
                while (p_buf!=NULL) {
                        free_pages((unsigned long)p_buf->p_buffer,
			     (int)pages_to_order_of_mag(
			     	privptr->p_buff_pages_perread ));
                        p_buf=p_buf->next;
                }
        }
	 CLAW_DBF_TEXT(4, trace, "freewrit");
        if (privptr->p_env->write_size < PAGE_SIZE ) {
                free_pages((unsigned long)privptr->p_buff_write,
		      (int)pages_to_order_of_mag(privptr->p_buff_write_num));
        }
        else {
                p_buf=privptr->p_write_active_first;
                while (p_buf!=NULL) {
                        free_pages((unsigned long)p_buf->p_buffer,
			      (int)pages_to_order_of_mag(
			      privptr->p_buff_pages_perwrite ));
                        p_buf=p_buf->next;
                }
        }
	 CLAW_DBF_TEXT(4, trace, "clearptr");
	privptr->buffs_alloc = 0;
        privptr->p_buff_ccw=NULL;
        privptr->p_buff_read=NULL;
        privptr->p_buff_write=NULL;
        privptr->system_validate_comp=0;
        privptr->release_pend=0;
        /*      Remove any writes that were pending and reset all reads   */
        p_this_ccw=privptr->p_read_active_first;
        while (p_this_ccw!=NULL) {
                p_this_ccw->header.length=0xffff;
                p_this_ccw->header.opcode=0xff;
                p_this_ccw->header.flag=0x00;
                p_this_ccw=p_this_ccw->next;
        }

        while (privptr->p_write_active_first!=NULL) {
                p_this_ccw=privptr->p_write_active_first;
                p_this_ccw->header.flag=CLAW_PENDING;
                privptr->p_write_active_first=p_this_ccw->next;
                p_this_ccw->next=privptr->p_write_free_chain;
                privptr->p_write_free_chain=p_this_ccw;
                ++privptr->write_free_count;
        }
        privptr->p_write_active_last=NULL;
        privptr->mtc_logical_link = -1;
        privptr->mtc_skipping = 1;
        privptr->mtc_offset=0;

	if (((privptr->channel[READ_CHANNEL].last_dstat |
		privptr->channel[WRITE_CHANNEL].last_dstat) &
		~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
		dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
			"Deactivating %s completed with incorrect"
			" subchannel status "
			"(read %02x, write %02x)\n",
                dev->name,
		privptr->channel[READ_CHANNEL].last_dstat,
		privptr->channel[WRITE_CHANNEL].last_dstat);
		 CLAW_DBF_TEXT(2, trace, "badclose");
        }
	CLAW_DBF_TEXT(4, trace, "rlsexit");
        return 0;
}      /* end of claw_release     */

/*-------------------------------------------------------------------*
*       claw_write_retry                                             *
*                                                                    *
*--------------------------------------------------------------------*/

static void
claw_write_retry ( struct chbk *p_ch )
{

        struct net_device  *dev=p_ch->ndev;

	CLAW_DBF_TEXT(4, trace, "w_retry");
        if (p_ch->claw_state == CLAW_STOP) {
        	return;
        }
	claw_strt_out_IO( dev );
	CLAW_DBF_TEXT(4, trace, "rtry_xit");
        return;
}      /* end of claw_write_retry      */


/*-------------------------------------------------------------------*
*       claw_write_next                                              *
*                                                                    *
*--------------------------------------------------------------------*/

static void
claw_write_next ( struct chbk * p_ch )
{

        struct net_device  *dev;
        struct claw_privbk *privptr=NULL;
	struct sk_buff *pk_skb;

	CLAW_DBF_TEXT(4, trace, "claw_wrt");
        if (p_ch->claw_state == CLAW_STOP)
                return;
        dev = (struct net_device *) p_ch->ndev;
	privptr = (struct claw_privbk *) dev->ml_priv;
        claw_free_wrt_buf( dev );
	if ((privptr->write_free_count > 0) &&
	    !skb_queue_empty(&p_ch->collect_queue)) {
	  	pk_skb = claw_pack_skb(privptr);
		while (pk_skb != NULL) {
			claw_hw_tx(pk_skb, dev, 1);
			if (privptr->write_free_count > 0) {
	   			pk_skb = claw_pack_skb(privptr);
			} else
				pk_skb = NULL;
		}
	}
        if (privptr->p_write_active_first!=NULL) {
                claw_strt_out_IO(dev);
        }
        return;
}      /* end of claw_write_next      */

/*-------------------------------------------------------------------*
*                                                                    *
*       claw_timer                                                   *
*--------------------------------------------------------------------*/

static void
claw_timer ( struct chbk * p_ch )
{
	CLAW_DBF_TEXT(4, trace, "timer");
        p_ch->flag |= CLAW_TIMER;
        wake_up(&p_ch->wait);
        return;
}      /* end of claw_timer  */

/*
*
*       functions
*/


/*-------------------------------------------------------------------*
*                                                                    *
*     pages_to_order_of_mag                                          *
*                                                                    *
*    takes a number of pages from 1 to 512 and returns the           *
*    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
*    of magnitude get_free_pages() has an upper order of 9           *
*--------------------------------------------------------------------*/

static int
pages_to_order_of_mag(int num_of_pages)
{
	int	order_of_mag=1;		/* assume 2 pages */
	int	nump;

	CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
	if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
	/* 512 pages = 2Meg on 4k page systems */
	if (num_of_pages >= 512) {return 9; }
	/* we have two or more pages order is at least 1 */
	for (nump=2 ;nump <= 512;nump*=2) {
	  if (num_of_pages <= nump)
		  break;
	  order_of_mag +=1;
	}
	if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
	CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
	return order_of_mag;
}

/*-------------------------------------------------------------------*
*                                                                    *
*     add_claw_reads                                                 *
*                                                                    *
*--------------------------------------------------------------------*/
static int
add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
	struct ccwbk* p_last)
{
        struct claw_privbk *privptr;
        struct ccw1  temp_ccw;
        struct endccw * p_end;
	CLAW_DBF_TEXT(4, trace, "addreads");
	privptr = dev->ml_priv;
        p_end = privptr->p_end_ccw;

        /* first CCW and last CCW contains a new set of read channel programs
        *       to apend the running channel programs
        */
        if ( p_first==NULL) {
		CLAW_DBF_TEXT(4, trace, "addexit");
                return 0;
        }

        /* set up ending CCW sequence for this segment */
        if (p_end->read1) {
                p_end->read1=0x00;    /*  second ending CCW is now active */
                /*      reset ending CCWs and setup TIC CCWs              */
                p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
                p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
                p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
                p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
                p_end->read2_nop2.cda=0;
                p_end->read2_nop2.count=1;
        }
        else {
                p_end->read1=0x01;  /* first ending CCW is now active */
                /*      reset ending CCWs and setup TIC CCWs          */
                p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
                p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
                p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
                p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
                p_end->read1_nop2.cda=0;
                p_end->read1_nop2.count=1;
        }

        if ( privptr-> p_read_active_first ==NULL ) {
		privptr->p_read_active_first = p_first;  /*  set new first */
		privptr->p_read_active_last  = p_last;   /*  set new last  */
        }
        else {

                /* set up TIC ccw  */
                temp_ccw.cda= (__u32)__pa(&p_first->read);
                temp_ccw.count=0;
                temp_ccw.flags=0;
                temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;


                if (p_end->read1) {

               /* first set of CCW's is chained to the new read              */
               /* chain, so the second set is chained to the active chain.   */
               /* Therefore modify the second set to point to the new        */
               /* read chain set up TIC CCWs                                 */
               /* make sure we update the CCW so channel doesn't fetch it    */
               /* when it's only half done                                   */
                        memcpy( &p_end->read2_nop2, &temp_ccw ,
				sizeof(struct ccw1));
                        privptr->p_read_active_last->r_TIC_1.cda=
				(__u32)__pa(&p_first->read);
                        privptr->p_read_active_last->r_TIC_2.cda=
				(__u32)__pa(&p_first->read);
                }
                else {
                        /* make sure we update the CCW so channel doesn't   */
			/* fetch it when it is only half done               */
                        memcpy( &p_end->read1_nop2, &temp_ccw ,
				sizeof(struct ccw1));
                        privptr->p_read_active_last->r_TIC_1.cda=
				(__u32)__pa(&p_first->read);
                        privptr->p_read_active_last->r_TIC_2.cda=
				(__u32)__pa(&p_first->read);
                }
		/*      chain in new set of blocks                         */
                privptr->p_read_active_last->next = p_first;
                privptr->p_read_active_last=p_last;
        } /* end of if ( privptr-> p_read_active_first ==NULL)  */
	CLAW_DBF_TEXT(4, trace, "addexit");
        return 0;
}    /*     end of add_claw_reads   */

/*-------------------------------------------------------------------*
 *   ccw_check_return_code                                           *
 *                                                                   *
 *-------------------------------------------------------------------*/

static void
ccw_check_return_code(struct ccw_device *cdev, int return_code)
{
	CLAW_DBF_TEXT(4, trace, "ccwret");
        if (return_code != 0) {
                switch (return_code) {
		case -EBUSY: /* BUSY is a transient state no action needed */
			break;
		case -ENODEV:
			dev_err(&cdev->dev, "The remote channel adapter is not"
				" available\n");
			break;
		case -EINVAL:
			dev_err(&cdev->dev,
				"The status of the remote channel adapter"
				" is not valid\n");
			break;
		default:
			dev_err(&cdev->dev, "The common device layer"
				" returned error code %d\n",
				  return_code);
		}
	}
	CLAW_DBF_TEXT(4, trace, "ccwret");
}    /*    end of ccw_check_return_code   */

/*-------------------------------------------------------------------*
*       ccw_check_unit_check                                         *
*--------------------------------------------------------------------*/

static void
ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
{
	struct net_device *ndev = p_ch->ndev;
	struct device *dev = &p_ch->cdev->dev;

	CLAW_DBF_TEXT(4, trace, "unitchek");
	dev_warn(dev, "The communication peer of %s disconnected\n",
		ndev->name);

	if (sense & 0x40) {
		if (sense & 0x01) {
			dev_warn(dev, "The remote channel adapter for"
				" %s has been reset\n",
				ndev->name);
		}
	} else if (sense & 0x20) {
		if (sense & 0x04) {
			dev_warn(dev, "A data streaming timeout occurred"
				" for %s\n",
				ndev->name);
		} else if (sense & 0x10) {
			dev_warn(dev, "The remote channel adapter for %s"
				" is faulty\n",
				ndev->name);
		} else {
			dev_warn(dev, "A data transfer parity error occurred"
				" for %s\n",
				ndev->name);
		}
	} else if (sense & 0x10) {
		dev_warn(dev, "A read data parity error occurred"
			" for %s\n",
			ndev->name);
	}

}   /*    end of ccw_check_unit_check    */

/*-------------------------------------------------------------------*
*               find_link                                            *
*--------------------------------------------------------------------*/
static int
find_link(struct net_device *dev, char *host_name, char *ws_name )
{
	struct claw_privbk *privptr;
	struct claw_env *p_env;
	int    rc=0;

	CLAW_DBF_TEXT(2, setup, "findlink");
	privptr = dev->ml_priv;
        p_env=privptr->p_env;
	switch (p_env->packing)
	{
		case  PACKING_ASK:
			if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
			    (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
        	             rc = EINVAL;
			break;
		case  DO_PACKED:
		case  PACK_SEND:
			if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
			    (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
        	        	rc = EINVAL;
			break;
		default:
	       		if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
		    	    (memcmp(p_env->api_type , ws_name, 8)!=0))
        	        	rc = EINVAL;
			break;
	}

	return rc;
}    /*    end of find_link    */

/*-------------------------------------------------------------------*
 *   claw_hw_tx                                                      *
 *                                                                   *
 *                                                                   *
 *-------------------------------------------------------------------*/

static int
claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
{
        int                             rc=0;
        struct claw_privbk 		*privptr;
        struct ccwbk           *p_this_ccw;
        struct ccwbk           *p_first_ccw;
        struct ccwbk           *p_last_ccw;
        __u32                           numBuffers;
        signed long                     len_of_data;
        unsigned long                   bytesInThisBuffer;
        unsigned char                   *pDataAddress;
        struct endccw                   *pEnd;
        struct ccw1                     tempCCW;
	struct claw_env			*p_env;
	struct clawph			*pk_head;
	struct chbk			*ch;

	CLAW_DBF_TEXT(4, trace, "hw_tx");
	privptr = (struct claw_privbk *)(dev->ml_priv);
	p_env =privptr->p_env;
	claw_free_wrt_buf(dev);	/* Clean up free chain if posible */
        /*  scan the write queue to free any completed write packets   */
        p_first_ccw=NULL;
        p_last_ccw=NULL;
	if ((p_env->packing >= PACK_SEND) &&
       	    (skb->cb[1] != 'P')) {
		skb_push(skb,sizeof(struct clawph));
		pk_head=(struct clawph *)skb->data;
		pk_head->len=skb->len-sizeof(struct clawph);
		if (pk_head->len%4)  {
			pk_head->len+= 4-(pk_head->len%4);
			skb_pad(skb,4-(pk_head->len%4));
			skb_put(skb,4-(pk_head->len%4));
		}
		if (p_env->packing == DO_PACKED)
			pk_head->link_num = linkid;
		else
			pk_head->link_num = 0;
		pk_head->flag = 0x00;
		skb_pad(skb,4);
		skb->cb[1] = 'P';
	}
        if (linkid == 0) {


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