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claw.c
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claw.c
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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 <[email protected]>
* Rewritten by
* Andy Richter <[email protected]>
* Marc Price <[email protected]>
*
* 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();
set_current_state(TASK_RUNNING);
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();
set_current_state(TASK_RUNNING);
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
*/