Pileus Git - ~andy/linux/blob - drivers/s390/net/claw.c

   1 /*
   2  *  drivers/s390/net/claw.c
   3  *    ESCON CLAW network driver
   4  *
   5  *  Linux for zSeries version
   6  *    Copyright IBM Corp. 2002, 2009
   7  *  Author(s) Original code written by:
   8  *              Kazuo Iimura <iimura@jp.ibm.com>
   9  *            Rewritten by
  10  *              Andy Richter <richtera@us.ibm.com>
  11  *              Marc Price <mwprice@us.ibm.com>
  12  *
  13  *    sysfs parms:
  14  *   group x.x.rrrr,x.x.wwww
  15  *   read_buffer nnnnnnn
  16  *   write_buffer nnnnnn
  17  *   host_name  aaaaaaaa
  18  *   adapter_name aaaaaaaa
  19  *   api_type    aaaaaaaa
  20  *
  21  *  eg.
  22  *   group  0.0.0200 0.0.0201
  23  *   read_buffer 25
  24  *   write_buffer 20
  25  *   host_name LINUX390
  26  *   adapter_name RS6K
  27  *   api_type     TCPIP
  28  *
  29  *  where
  30  *
  31  *   The device id is decided by the order entries
  32  *   are added to the group the first is claw0 the second claw1
  33  *   up to CLAW_MAX_DEV
  34  *
  35  *   rrrr     - the first of 2 consecutive device addresses used for the
  36  *              CLAW protocol.
  37  *              The specified address is always used as the input (Read)
  38  *              channel and the next address is used as the output channel.
  39  *
  40  *   wwww     - the second of 2 consecutive device addresses used for
  41  *              the CLAW protocol.
  42  *              The specified address is always used as the output
  43  *              channel and the previous address is used as the input channel.
  44  *
  45  *   read_buffer        -       specifies number of input buffers to allocate.
  46  *   write_buffer       -       specifies number of output buffers to allocate.
  47  *   host_name          -       host name
  48  *   adaptor_name       -       adaptor name
  49  *   api_type           -       API type TCPIP or API will be sent and expected
  50  *                              as ws_name
  51  *
  52  *   Note the following requirements:
  53  *   1)  host_name must match the configured adapter_name on the remote side
  54  *   2)  adaptor_name must match the configured host name on the remote side
  55  *
  56  *  Change History
  57  *    1.00  Initial release shipped
  58  *    1.10  Changes for Buffer allocation
  59  *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
  60  *    1.25  Added Packing support
  61  *    1.5
  62  */
  63
  64 #define KMSG_COMPONENT "claw"
  65
  66 #include <asm/ccwdev.h>
  67 #include <asm/ccwgroup.h>
  68 #include <asm/debug.h>
  69 #include <asm/idals.h>
  70 #include <asm/io.h>
  71 #include <linux/bitops.h>
  72 #include <linux/ctype.h>
  73 #include <linux/delay.h>
  74 #include <linux/errno.h>
  75 #include <linux/if_arp.h>
  76 #include <linux/init.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/ip.h>
  79 #include <linux/kernel.h>
  80 #include <linux/module.h>
  81 #include <linux/netdevice.h>
  82 #include <linux/etherdevice.h>
  83 #include <linux/proc_fs.h>
  84 #include <linux/sched.h>
  85 #include <linux/signal.h>
  86 #include <linux/skbuff.h>
  87 #include <linux/slab.h>
  88 #include <linux/string.h>
  89 #include <linux/tcp.h>
  90 #include <linux/timer.h>
  91 #include <linux/types.h>
  92
  93 #include "claw.h"
  94
  95 /*
  96    CLAW uses the s390dbf file system  see claw_trace and claw_setup
  97 */
  98
  99 static char version[] __initdata = "CLAW driver";
 100 static char debug_buffer[255];
 101 /**
 102  * Debug Facility Stuff
 103  */
 104 static debug_info_t *claw_dbf_setup;
 105 static debug_info_t *claw_dbf_trace;
 106
 107 /**
 108  *  CLAW Debug Facility functions
 109  */
 110 static void
 111 claw_unregister_debug_facility(void)
 112 {
 113         if (claw_dbf_setup)
 114                 debug_unregister(claw_dbf_setup);
 115         if (claw_dbf_trace)
 116                 debug_unregister(claw_dbf_trace);
 117 }
 118
 119 static int
 120 claw_register_debug_facility(void)
 121 {
 122         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
 123         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
 124         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
 125                 claw_unregister_debug_facility();
 126                 return -ENOMEM;
 127         }
 128         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
 129         debug_set_level(claw_dbf_setup, 2);
 130         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
 131         debug_set_level(claw_dbf_trace, 2);
 132         return 0;
 133 }
 134
 135 static inline void
 136 claw_set_busy(struct net_device *dev)
 137 {
 138  ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
 139 }
 140
 141 static inline void
 142 claw_clear_busy(struct net_device *dev)
 143 {
 144         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
 145         netif_wake_queue(dev);
 146 }
 147
 148 static inline int
 149 claw_check_busy(struct net_device *dev)
 150 {
 151         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
 152 }
 153
 154 static inline void
 155 claw_setbit_busy(int nr,struct net_device *dev)
 156 {
 157         netif_stop_queue(dev);
 158         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 159 }
 160
 161 static inline void
 162 claw_clearbit_busy(int nr,struct net_device *dev)
 163 {
 164         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 165         netif_wake_queue(dev);
 166 }
 167
 168 static inline int
 169 claw_test_and_setbit_busy(int nr,struct net_device *dev)
 170 {
 171         netif_stop_queue(dev);
 172         return test_and_set_bit(nr,
 173                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
 174 }
 175
 176
 177 /* Functions for the DEV methods */
 178
 179 static int claw_probe(struct ccwgroup_device *cgdev);
 180 static void claw_remove_device(struct ccwgroup_device *cgdev);
 181 static void claw_purge_skb_queue(struct sk_buff_head *q);
 182 static int claw_new_device(struct ccwgroup_device *cgdev);
 183 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
 184 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
 185 static int claw_change_mtu( struct net_device *dev, int new_mtu);
 186 static int claw_open(struct net_device *dev);
 187 static void claw_irq_handler(struct ccw_device *cdev,
 188         unsigned long intparm, struct irb *irb);
 189 static void claw_irq_tasklet ( unsigned long data );
 190 static int claw_release(struct net_device *dev);
 191 static void claw_write_retry ( struct chbk * p_ch );
 192 static void claw_write_next ( struct chbk * p_ch );
 193 static void claw_timer ( struct chbk * p_ch );
 194
 195 /* Functions */
 196 static int add_claw_reads(struct net_device *dev,
 197         struct ccwbk* p_first, struct ccwbk* p_last);
 198 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
 199 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
 200 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
 201 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
 202 static int init_ccw_bk(struct net_device *dev);
 203 static void probe_error( struct ccwgroup_device *cgdev);
 204 static struct net_device_stats *claw_stats(struct net_device *dev);
 205 static int pages_to_order_of_mag(int num_of_pages);
 206 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
 207 /* sysfs Functions */
 208 static ssize_t claw_hname_show(struct device *dev,
 209         struct device_attribute *attr, char *buf);
 210 static ssize_t claw_hname_write(struct device *dev,
 211         struct device_attribute *attr,
 212         const char *buf, size_t count);
 213 static ssize_t claw_adname_show(struct device *dev,
 214         struct device_attribute *attr, char *buf);
 215 static ssize_t claw_adname_write(struct device *dev,
 216         struct device_attribute *attr,
 217         const char *buf, size_t count);
 218 static ssize_t claw_apname_show(struct device *dev,
 219         struct device_attribute *attr, char *buf);
 220 static ssize_t claw_apname_write(struct device *dev,
 221         struct device_attribute *attr,
 222         const char *buf, size_t count);
 223 static ssize_t claw_wbuff_show(struct device *dev,
 224         struct device_attribute *attr, char *buf);
 225 static ssize_t claw_wbuff_write(struct device *dev,
 226         struct device_attribute *attr,
 227         const char *buf, size_t count);
 228 static ssize_t claw_rbuff_show(struct device *dev,
 229         struct device_attribute *attr, char *buf);
 230 static ssize_t claw_rbuff_write(struct device *dev,
 231         struct device_attribute *attr,
 232         const char *buf, size_t count);
 233
 234 /*   Functions for System Validate  */
 235 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
 236 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
 237        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
 238 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
 239 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
 240 static int claw_snd_sys_validate_rsp(struct net_device *dev,
 241         struct clawctl * p_ctl, __u32 return_code);
 242 static int claw_strt_conn_req(struct net_device *dev );
 243 static void claw_strt_read(struct net_device *dev, int lock);
 244 static void claw_strt_out_IO(struct net_device *dev);
 245 static void claw_free_wrt_buf(struct net_device *dev);
 246
 247 /* Functions for unpack reads   */
 248 static void unpack_read(struct net_device *dev);
 249
 250 static int claw_pm_prepare(struct ccwgroup_device *gdev)
 251 {
 252         return -EPERM;
 253 }
 254
 255 /* the root device for claw group devices */
 256 static struct device *claw_root_dev;
 257
 258 /* ccwgroup table  */
 259
 260 static struct ccwgroup_driver claw_group_driver = {
 261         .driver = {
 262                 .owner  = THIS_MODULE,
 263                 .name   = "claw",
 264         },
 265         .setup       = claw_probe,
 266         .remove      = claw_remove_device,
 267         .set_online  = claw_new_device,
 268         .set_offline = claw_shutdown_device,
 269         .prepare     = claw_pm_prepare,
 270 };
 271
 272 static struct ccw_device_id claw_ids[] = {
 273         {CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
 274         {},
 275 };
 276 MODULE_DEVICE_TABLE(ccw, claw_ids);
 277
 278 static struct ccw_driver claw_ccw_driver = {
 279         .driver = {
 280                 .owner  = THIS_MODULE,
 281                 .name   = "claw",
 282         },
 283         .ids    = claw_ids,
 284         .probe  = ccwgroup_probe_ccwdev,
 285         .remove = ccwgroup_remove_ccwdev,
 286         .int_class = IOINT_CLW,
 287 };
 288
 289 static ssize_t claw_driver_group_store(struct device_driver *ddrv,
 290                                        const char *buf, size_t count)
 291 {
 292         int err;
 293         err = ccwgroup_create_dev(claw_root_dev, &claw_group_driver, 2, buf);
 294         return err ? err : count;
 295 }
 296 static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);
 297
 298 static struct attribute *claw_drv_attrs[] = {
 299         &driver_attr_group.attr,
 300         NULL,
 301 };
 302 static struct attribute_group claw_drv_attr_group = {
 303         .attrs = claw_drv_attrs,
 304 };
 305 static const struct attribute_group *claw_drv_attr_groups[] = {
 306         &claw_drv_attr_group,
 307         NULL,
 308 };
 309
 310 /*
 311 *       Key functions
 312 */
 313
 314 /*-------------------------------------------------------------------*
 315  *   claw_tx                                                         *
 316  *-------------------------------------------------------------------*/
 317
 318 static int
 319 claw_tx(struct sk_buff *skb, struct net_device *dev)
 320 {
 321         int             rc;
 322         struct claw_privbk *privptr = dev->ml_priv;
 323         unsigned long saveflags;
 324         struct chbk *p_ch;
 325
 326         CLAW_DBF_TEXT(4, trace, "claw_tx");
 327         p_ch = &privptr->channel[WRITE_CHANNEL];
 328         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
 329         rc=claw_hw_tx( skb, dev, 1 );
 330         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
 331         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
 332         if (rc)
 333                 rc = NETDEV_TX_BUSY;
 334         else
 335                 rc = NETDEV_TX_OK;
 336         return rc;
 337 }   /*  end of claw_tx */
 338
 339 /*------------------------------------------------------------------*
 340  *  pack the collect queue into an skb and return it                *
 341  *   If not packing just return the top skb from the queue          *
 342  *------------------------------------------------------------------*/
 343
 344 static struct sk_buff *
 345 claw_pack_skb(struct claw_privbk *privptr)
 346 {
 347         struct sk_buff *new_skb,*held_skb;
 348         struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
 349         struct claw_env  *p_env = privptr->p_env;
 350         int     pkt_cnt,pk_ind,so_far;
 351
 352         new_skb = NULL;         /* assume no dice */
 353         pkt_cnt = 0;
 354         CLAW_DBF_TEXT(4, trace, "PackSKBe");
 355         if (!skb_queue_empty(&p_ch->collect_queue)) {
 356         /* some data */
 357                 held_skb = skb_dequeue(&p_ch->collect_queue);
 358                 if (held_skb)
 359                         dev_kfree_skb_any(held_skb);
 360                 else
 361                         return NULL;
 362                 if (p_env->packing != DO_PACKED)
 363                         return held_skb;
 364                 /* get a new SKB we will pack at least one */
 365                 new_skb = dev_alloc_skb(p_env->write_size);
 366                 if (new_skb == NULL) {
 367                         atomic_inc(&held_skb->users);
 368                         skb_queue_head(&p_ch->collect_queue,held_skb);
 369                         return NULL;
 370                 }
 371                 /* we have packed packet and a place to put it  */
 372                 pk_ind = 1;
 373                 so_far = 0;
 374                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 375                 while ((pk_ind) && (held_skb != NULL)) {
 376                         if (held_skb->len+so_far <= p_env->write_size-8) {
 377                                 memcpy(skb_put(new_skb,held_skb->len),
 378                                         held_skb->data,held_skb->len);
 379                                 privptr->stats.tx_packets++;
 380                                 so_far += held_skb->len;
 381                                 pkt_cnt++;
 382                                 dev_kfree_skb_any(held_skb);
 383                                 held_skb = skb_dequeue(&p_ch->collect_queue);
 384                                 if (held_skb)
 385                                         atomic_dec(&held_skb->users);
 386                         } else {
 387                                 pk_ind = 0;
 388                                 atomic_inc(&held_skb->users);
 389                                 skb_queue_head(&p_ch->collect_queue,held_skb);
 390                         }
 391                 }
 392         }
 393         CLAW_DBF_TEXT(4, trace, "PackSKBx");
 394         return new_skb;
 395 }
 396
 397 /*-------------------------------------------------------------------*
 398  *   claw_change_mtu                                                 *
 399  *                                                                   *
 400  *-------------------------------------------------------------------*/
 401
 402 static int
 403 claw_change_mtu(struct net_device *dev, int new_mtu)
 404 {
 405         struct claw_privbk *privptr = dev->ml_priv;
 406         int buff_size;
 407         CLAW_DBF_TEXT(4, trace, "setmtu");
 408         buff_size = privptr->p_env->write_size;
 409         if ((new_mtu < 60) || (new_mtu > buff_size)) {
 410                 return -EINVAL;
 411         }
 412         dev->mtu = new_mtu;
 413         return 0;
 414 }  /*   end of claw_change_mtu */
 415
 416
 417 /*-------------------------------------------------------------------*
 418  *   claw_open                                                       *
 419  *                                                                   *
 420  *-------------------------------------------------------------------*/
 421 static int
 422 claw_open(struct net_device *dev)
 423 {
 424
 425         int     rc;
 426         int     i;
 427         unsigned long       saveflags=0;
 428         unsigned long       parm;
 429         struct claw_privbk  *privptr;
 430         DECLARE_WAITQUEUE(wait, current);
 431         struct timer_list  timer;
 432         struct ccwbk *p_buf;
 433
 434         CLAW_DBF_TEXT(4, trace, "open");
 435         privptr = (struct claw_privbk *)dev->ml_priv;
 436         /*   allocate and initialize CCW blocks */
 437         if (privptr->buffs_alloc == 0) {
 438                 rc=init_ccw_bk(dev);
 439                 if (rc) {
 440                         CLAW_DBF_TEXT(2, trace, "openmem");
 441                         return -ENOMEM;
 442                 }
 443         }
 444         privptr->system_validate_comp=0;
 445         privptr->release_pend=0;
 446         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 447                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 448                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 449                 privptr->p_env->packing=PACKING_ASK;
 450         } else {
 451                 privptr->p_env->packing=0;
 452                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
 453                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
 454         }
 455         claw_set_busy(dev);
 456         tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
 457                 (unsigned long) &privptr->channel[READ_CHANNEL]);
 458         for ( i = 0; i < 2;  i++) {
 459                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 460                 init_waitqueue_head(&privptr->channel[i].wait);
 461                 /* skb_queue_head_init(&p_ch->io_queue); */
 462                 if (i == WRITE_CHANNEL)
 463                         skb_queue_head_init(
 464                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
 465                 privptr->channel[i].flag_a = 0;
 466                 privptr->channel[i].IO_active = 0;
 467                 privptr->channel[i].flag  &= ~CLAW_TIMER;
 468                 init_timer(&timer);
 469                 timer.function = (void *)claw_timer;
 470                 timer.data = (unsigned long)(&privptr->channel[i]);
 471                 timer.expires = jiffies + 15*HZ;
 472                 add_timer(&timer);
 473                 spin_lock_irqsave(get_ccwdev_lock(
 474                         privptr->channel[i].cdev), saveflags);
 475                 parm = (unsigned long) &privptr->channel[i];
 476                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 477                 rc = 0;
 478                 add_wait_queue(&privptr->channel[i].wait, &wait);
 479                 rc = ccw_device_halt(
 480                         (struct ccw_device *)privptr->channel[i].cdev,parm);
 481                 set_current_state(TASK_INTERRUPTIBLE);
 482                 spin_unlock_irqrestore(
 483                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 484                 schedule();
 485                 set_current_state(TASK_RUNNING);
 486                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 487                 if(rc != 0)
 488                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 489                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 490                         del_timer(&timer);
 491         }
 492         if ((((privptr->channel[READ_CHANNEL].last_dstat |
 493                 privptr->channel[WRITE_CHANNEL].last_dstat) &
 494            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 495            (((privptr->channel[READ_CHANNEL].flag |
 496                 privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
 497                 dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
 498                         "%s: remote side is not ready\n", dev->name);
 499                 CLAW_DBF_TEXT(2, trace, "notrdy");
 500
 501                 for ( i = 0; i < 2;  i++) {
 502                         spin_lock_irqsave(
 503                                 get_ccwdev_lock(privptr->channel[i].cdev),
 504                                 saveflags);
 505                         parm = (unsigned long) &privptr->channel[i];
 506                         privptr->channel[i].claw_state = CLAW_STOP;
 507                         rc = ccw_device_halt(
 508                                 (struct ccw_device *)&privptr->channel[i].cdev,
 509                                 parm);
 510                         spin_unlock_irqrestore(
 511                                 get_ccwdev_lock(privptr->channel[i].cdev),
 512                                 saveflags);
 513                         if (rc != 0) {
 514                                 ccw_check_return_code(
 515                                         privptr->channel[i].cdev, rc);
 516                         }
 517                 }
 518                 free_pages((unsigned long)privptr->p_buff_ccw,
 519                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 520                 if (privptr->p_env->read_size < PAGE_SIZE) {
 521                         free_pages((unsigned long)privptr->p_buff_read,
 522                                (int)pages_to_order_of_mag(
 523                                         privptr->p_buff_read_num));
 524                 }
 525                 else {
 526                         p_buf=privptr->p_read_active_first;
 527                         while (p_buf!=NULL) {
 528                                 free_pages((unsigned long)p_buf->p_buffer,
 529                                       (int)pages_to_order_of_mag(
 530                                         privptr->p_buff_pages_perread ));
 531                                 p_buf=p_buf->next;
 532                         }
 533                 }
 534                 if (privptr->p_env->write_size < PAGE_SIZE ) {
 535                         free_pages((unsigned long)privptr->p_buff_write,
 536                              (int)pages_to_order_of_mag(
 537                                 privptr->p_buff_write_num));
 538                 }
 539                 else {
 540                         p_buf=privptr->p_write_active_first;
 541                         while (p_buf!=NULL) {
 542                                 free_pages((unsigned long)p_buf->p_buffer,
 543                                      (int)pages_to_order_of_mag(
 544                                         privptr->p_buff_pages_perwrite ));
 545                                 p_buf=p_buf->next;
 546                         }
 547                 }
 548                 privptr->buffs_alloc = 0;
 549                 privptr->channel[READ_CHANNEL].flag = 0x00;
 550                 privptr->channel[WRITE_CHANNEL].flag = 0x00;
 551                 privptr->p_buff_ccw=NULL;
 552                 privptr->p_buff_read=NULL;
 553                 privptr->p_buff_write=NULL;
 554                 claw_clear_busy(dev);
 555                 CLAW_DBF_TEXT(2, trace, "open EIO");
 556                 return -EIO;
 557         }
 558
 559         /*   Send SystemValidate command */
 560
 561         claw_clear_busy(dev);
 562         CLAW_DBF_TEXT(4, trace, "openok");
 563         return 0;
 564 }    /*     end of claw_open    */
 565
 566 /*-------------------------------------------------------------------*
 567 *                                                                    *
 568 *       claw_irq_handler                                             *
 569 *                                                                    *
 570 *--------------------------------------------------------------------*/
 571 static void
 572 claw_irq_handler(struct ccw_device *cdev,
 573         unsigned long intparm, struct irb *irb)
 574 {
 575         struct chbk *p_ch = NULL;
 576         struct claw_privbk *privptr = NULL;
 577         struct net_device *dev = NULL;
 578         struct claw_env  *p_env;
 579         struct chbk *p_ch_r=NULL;
 580
 581         CLAW_DBF_TEXT(4, trace, "clawirq");
 582         /* Bypass all 'unsolicited interrupts' */
 583         privptr = dev_get_drvdata(&cdev->dev);
 584         if (!privptr) {
 585                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 586                         " IRQ, c-%02x d-%02x\n",
 587                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 588                 CLAW_DBF_TEXT(2, trace, "badirq");
 589                 return;
 590         }
 591
 592         /* Try to extract channel from driver data. */
 593         if (privptr->channel[READ_CHANNEL].cdev == cdev)
 594                 p_ch = &privptr->channel[READ_CHANNEL];
 595         else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
 596                 p_ch = &privptr->channel[WRITE_CHANNEL];
 597         else {
 598                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 599                 CLAW_DBF_TEXT(2, trace, "badchan");
 600                 return;
 601         }
 602         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 603
 604         dev = (struct net_device *) (p_ch->ndev);
 605         p_env=privptr->p_env;
 606
 607         /* Copy interruption response block. */
 608         memcpy(p_ch->irb, irb, sizeof(struct irb));
 609
 610         /* Check for good subchannel return code, otherwise info message */
 611         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 612                 dev_info(&cdev->dev,
 613                         "%s: subchannel check for device: %04x -"
 614                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 615                         dev->name, p_ch->devno,
 616                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 617                         irb->scsw.cmd.cpa);
 618                 CLAW_DBF_TEXT(2, trace, "chanchk");
 619                 /* return; */
 620         }
 621
 622         /* Check the reason-code of a unit check */
 623         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 624                 ccw_check_unit_check(p_ch, irb->ecw[0]);
 625
 626         /* State machine to bring the connection up, down and to restart */
 627         p_ch->last_dstat = irb->scsw.cmd.dstat;
 628
 629         switch (p_ch->claw_state) {
 630         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 631                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 632                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 633                 (p_ch->irb->scsw.cmd.stctl ==
 634                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 635                         return;
 636                 wake_up(&p_ch->wait);   /* wake up claw_release */
 637                 CLAW_DBF_TEXT(4, trace, "stop");
 638                 return;
 639         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 640                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 641                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 642                 (p_ch->irb->scsw.cmd.stctl ==
 643                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 644                         CLAW_DBF_TEXT(4, trace, "haltio");
 645                         return;
 646                 }
 647                 if (p_ch->flag == CLAW_READ) {
 648                         p_ch->claw_state = CLAW_START_READ;
 649                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 650                 } else if (p_ch->flag == CLAW_WRITE) {
 651                         p_ch->claw_state = CLAW_START_WRITE;
 652                         /*      send SYSTEM_VALIDATE                    */
 653                         claw_strt_read(dev, LOCK_NO);
 654                         claw_send_control(dev,
 655                                 SYSTEM_VALIDATE_REQUEST,
 656                                 0, 0, 0,
 657                                 p_env->host_name,
 658                                 p_env->adapter_name);
 659                 } else {
 660                         dev_warn(&cdev->dev, "The CLAW device received"
 661                                 " an unexpected IRQ, "
 662                                 "c-%02x d-%02x\n",
 663                                 irb->scsw.cmd.cstat,
 664                                 irb->scsw.cmd.dstat);
 665                         return;
 666                         }
 667                 CLAW_DBF_TEXT(4, trace, "haltio");
 668                 return;
 669         case CLAW_START_READ:
 670                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 671                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 672                         clear_bit(0, (void *)&p_ch->IO_active);
 673                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 674                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 675                             (p_ch->irb->ecw[0])        == 0) {
 676                                 privptr->stats.rx_errors++;
 677                                 dev_info(&cdev->dev,
 678                                         "%s: Restart is required after remote "
 679                                         "side recovers \n",
 680                                         dev->name);
 681                         }
 682                         CLAW_DBF_TEXT(4, trace, "notrdy");
 683                         return;
 684                 }
 685                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 686                         (p_ch->irb->scsw.cmd.dstat == 0)) {
 687                         if (test_and_set_bit(CLAW_BH_ACTIVE,
 688                                 (void *)&p_ch->flag_a) == 0)
 689                                 tasklet_schedule(&p_ch->tasklet);
 690                         else
 691                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
 692                         CLAW_DBF_TEXT(4, trace, "PCI_read");
 693                         return;
 694                 }
 695                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 696                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 697                  (p_ch->irb->scsw.cmd.stctl ==
 698                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 699                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
 700                         return;
 701                 }
 702                 clear_bit(0, (void *)&p_ch->IO_active);
 703                 claw_clearbit_busy(TB_RETRY, dev);
 704                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 705                         (void *)&p_ch->flag_a) == 0)
 706                         tasklet_schedule(&p_ch->tasklet);
 707                 else
 708                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
 709                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 710                 return;
 711         case CLAW_START_WRITE:
 712                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 713                         dev_info(&cdev->dev,
 714                                 "%s: Unit Check Occurred in "
 715                                 "write channel\n", dev->name);
 716                         clear_bit(0, (void *)&p_ch->IO_active);
 717                         if (p_ch->irb->ecw[0] & 0x80) {
 718                                 dev_info(&cdev->dev,
 719                                         "%s: Resetting Event "
 720                                         "occurred:\n", dev->name);
 721                                 init_timer(&p_ch->timer);
 722                                 p_ch->timer.function =
 723                                         (void *)claw_write_retry;
 724                                 p_ch->timer.data = (unsigned long)p_ch;
 725                                 p_ch->timer.expires = jiffies + 10*HZ;
 726                                 add_timer(&p_ch->timer);
 727                                 dev_info(&cdev->dev,
 728                                         "%s: write connection "
 729                                         "restarting\n", dev->name);
 730                         }
 731                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 732                         return;
 733                 }
 734                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 735                         clear_bit(0, (void *)&p_ch->IO_active);
 736                         dev_info(&cdev->dev,
 737                                 "%s: Unit Exception "
 738                                 "occurred in write channel\n",
 739                                 dev->name);
 740                 }
 741                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 742                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 743                 (p_ch->irb->scsw.cmd.stctl ==
 744                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 745                         CLAW_DBF_TEXT(4, trace, "writeUE");
 746                         return;
 747                 }
 748                 clear_bit(0, (void *)&p_ch->IO_active);
 749                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 750                         claw_write_next(p_ch);
 751                         claw_clearbit_busy(TB_TX, dev);
 752                         claw_clear_busy(dev);
 753                 }
 754                 p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
 755                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 756                         (void *)&p_ch_r->flag_a) == 0)
 757                         tasklet_schedule(&p_ch_r->tasklet);
 758                 CLAW_DBF_TEXT(4, trace, "StWtExit");
 759                 return;
 760         default:
 761                 dev_warn(&cdev->dev,
 762                         "The CLAW device for %s received an unexpected IRQ\n",
 763                          dev->name);
 764                 CLAW_DBF_TEXT(2, trace, "badIRQ");
 765                 return;
 766         }
 767
 768 }       /*   end of claw_irq_handler    */
 769
 770
 771 /*-------------------------------------------------------------------*
 772 *       claw_irq_tasklet                                             *
 773 *                                                                    *
 774 *--------------------------------------------------------------------*/
 775 static void
 776 claw_irq_tasklet ( unsigned long data )
 777 {
 778         struct chbk * p_ch;
 779         struct net_device  *dev;
 780
 781         p_ch = (struct chbk *) data;
 782         dev = (struct net_device *)p_ch->ndev;
 783         CLAW_DBF_TEXT(4, trace, "IRQtask");
 784         unpack_read(dev);
 785         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 786         CLAW_DBF_TEXT(4, trace, "TskletXt");
 787         return;
 788 }       /*    end of claw_irq_bh    */
 789
 790 /*-------------------------------------------------------------------*
 791 *       claw_release                                                 *
 792 *                                                                    *
 793 *--------------------------------------------------------------------*/
 794 static int
 795 claw_release(struct net_device *dev)
 796 {
 797         int                rc;
 798         int                i;
 799         unsigned long      saveflags;
 800         unsigned long      parm;
 801         struct claw_privbk *privptr;
 802         DECLARE_WAITQUEUE(wait, current);
 803         struct ccwbk*             p_this_ccw;
 804         struct ccwbk*             p_buf;
 805
 806         if (!dev)
 807                 return 0;
 808         privptr = (struct claw_privbk *)dev->ml_priv;
 809         if (!privptr)
 810                 return 0;
 811         CLAW_DBF_TEXT(4, trace, "release");
 812         privptr->release_pend=1;
 813         claw_setbit_busy(TB_STOP,dev);
 814         for ( i = 1; i >=0 ;  i--) {
 815                 spin_lock_irqsave(
 816                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 817              /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
 818                 privptr->channel[i].claw_state = CLAW_STOP;
 819                 privptr->channel[i].IO_active = 0;
 820                 parm = (unsigned long) &privptr->channel[i];
 821                 if (i == WRITE_CHANNEL)
 822                         claw_purge_skb_queue(
 823                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
 824                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 825                 if (privptr->system_validate_comp==0x00)  /* never opened? */
 826                    init_waitqueue_head(&privptr->channel[i].wait);
 827                 add_wait_queue(&privptr->channel[i].wait, &wait);
 828                 set_current_state(TASK_INTERRUPTIBLE);
 829                 spin_unlock_irqrestore(
 830                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 831                 schedule();
 832                 set_current_state(TASK_RUNNING);
 833                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 834                 if (rc != 0) {
 835                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 836                 }
 837         }
 838         if (privptr->pk_skb != NULL) {
 839                 dev_kfree_skb_any(privptr->pk_skb);
 840                 privptr->pk_skb = NULL;
 841         }
 842         if(privptr->buffs_alloc != 1) {
 843                 CLAW_DBF_TEXT(4, trace, "none2fre");
 844                 return 0;
 845         }
 846         CLAW_DBF_TEXT(4, trace, "freebufs");
 847         if (privptr->p_buff_ccw != NULL) {
 848                 free_pages((unsigned long)privptr->p_buff_ccw,
 849                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 850         }
 851         CLAW_DBF_TEXT(4, trace, "freeread");
 852         if (privptr->p_env->read_size < PAGE_SIZE) {
 853             if (privptr->p_buff_read != NULL) {
 854                 free_pages((unsigned long)privptr->p_buff_read,
 855                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 856                 }
 857         }
 858         else {
 859                 p_buf=privptr->p_read_active_first;
 860                 while (p_buf!=NULL) {
 861                         free_pages((unsigned long)p_buf->p_buffer,
 862                              (int)pages_to_order_of_mag(
 863                                 privptr->p_buff_pages_perread ));
 864                         p_buf=p_buf->next;
 865                 }
 866         }
 867          CLAW_DBF_TEXT(4, trace, "freewrit");
 868         if (privptr->p_env->write_size < PAGE_SIZE ) {
 869                 free_pages((unsigned long)privptr->p_buff_write,
 870                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 871         }
 872         else {
 873                 p_buf=privptr->p_write_active_first;
 874                 while (p_buf!=NULL) {
 875                         free_pages((unsigned long)p_buf->p_buffer,
 876                               (int)pages_to_order_of_mag(
 877                               privptr->p_buff_pages_perwrite ));
 878                         p_buf=p_buf->next;
 879                 }
 880         }
 881          CLAW_DBF_TEXT(4, trace, "clearptr");
 882         privptr->buffs_alloc = 0;
 883         privptr->p_buff_ccw=NULL;
 884         privptr->p_buff_read=NULL;
 885         privptr->p_buff_write=NULL;
 886         privptr->system_validate_comp=0;
 887         privptr->release_pend=0;
 888         /*      Remove any writes that were pending and reset all reads   */
 889         p_this_ccw=privptr->p_read_active_first;
 890         while (p_this_ccw!=NULL) {
 891                 p_this_ccw->header.length=0xffff;
 892                 p_this_ccw->header.opcode=0xff;
 893                 p_this_ccw->header.flag=0x00;
 894                 p_this_ccw=p_this_ccw->next;
 895         }
 896
 897         while (privptr->p_write_active_first!=NULL) {
 898                 p_this_ccw=privptr->p_write_active_first;
 899                 p_this_ccw->header.flag=CLAW_PENDING;
 900                 privptr->p_write_active_first=p_this_ccw->next;
 901                 p_this_ccw->next=privptr->p_write_free_chain;
 902                 privptr->p_write_free_chain=p_this_ccw;
 903                 ++privptr->write_free_count;
 904         }
 905         privptr->p_write_active_last=NULL;
 906         privptr->mtc_logical_link = -1;
 907         privptr->mtc_skipping = 1;
 908         privptr->mtc_offset=0;
 909
 910         if (((privptr->channel[READ_CHANNEL].last_dstat |
 911                 privptr->channel[WRITE_CHANNEL].last_dstat) &
 912                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 913                 dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
 914                         "Deactivating %s completed with incorrect"
 915                         " subchannel status "
 916                         "(read %02x, write %02x)\n",
 917                 dev->name,
 918                 privptr->channel[READ_CHANNEL].last_dstat,
 919                 privptr->channel[WRITE_CHANNEL].last_dstat);
 920                  CLAW_DBF_TEXT(2, trace, "badclose");
 921         }
 922         CLAW_DBF_TEXT(4, trace, "rlsexit");
 923         return 0;
 924 }      /* end of claw_release     */
 925
 926 /*-------------------------------------------------------------------*
 927 *       claw_write_retry                                             *
 928 *                                                                    *
 929 *--------------------------------------------------------------------*/
 930
 931 static void
 932 claw_write_retry ( struct chbk *p_ch )
 933 {
 934
 935         struct net_device  *dev=p_ch->ndev;
 936
 937         CLAW_DBF_TEXT(4, trace, "w_retry");
 938         if (p_ch->claw_state == CLAW_STOP) {
 939                 return;
 940         }
 941         claw_strt_out_IO( dev );
 942         CLAW_DBF_TEXT(4, trace, "rtry_xit");
 943         return;
 944 }      /* end of claw_write_retry      */
 945
 946
 947 /*-------------------------------------------------------------------*
 948 *       claw_write_next                                              *
 949 *                                                                    *
 950 *--------------------------------------------------------------------*/
 951
 952 static void
 953 claw_write_next ( struct chbk * p_ch )
 954 {
 955
 956         struct net_device  *dev;
 957         struct claw_privbk *privptr=NULL;
 958         struct sk_buff *pk_skb;
 959
 960         CLAW_DBF_TEXT(4, trace, "claw_wrt");
 961         if (p_ch->claw_state == CLAW_STOP)
 962                 return;
 963         dev = (struct net_device *) p_ch->ndev;
 964         privptr = (struct claw_privbk *) dev->ml_priv;
 965         claw_free_wrt_buf( dev );
 966         if ((privptr->write_free_count > 0) &&
 967             !skb_queue_empty(&p_ch->collect_queue)) {
 968                 pk_skb = claw_pack_skb(privptr);
 969                 while (pk_skb != NULL) {
 970                         claw_hw_tx(pk_skb, dev, 1);
 971                         if (privptr->write_free_count > 0) {
 972                                 pk_skb = claw_pack_skb(privptr);
 973                         } else
 974                                 pk_skb = NULL;
 975                 }
 976         }
 977         if (privptr->p_write_active_first!=NULL) {
 978                 claw_strt_out_IO(dev);
 979         }
 980         return;
 981 }      /* end of claw_write_next      */
 982
 983 /*-------------------------------------------------------------------*
 984 *                                                                    *
 985 *       claw_timer                                                   *
 986 *--------------------------------------------------------------------*/
 987
 988 static void
 989 claw_timer ( struct chbk * p_ch )
 990 {
 991         CLAW_DBF_TEXT(4, trace, "timer");
 992         p_ch->flag |= CLAW_TIMER;
 993         wake_up(&p_ch->wait);
 994         return;
 995 }      /* end of claw_timer  */
 996
 997 /*
 998 *
 999 *       functions
1000 */
1001
1002
1003 /*-------------------------------------------------------------------*
1004 *                                                                    *
1005 *     pages_to_order_of_mag                                          *
1006 *                                                                    *
1007 *    takes a number of pages from 1 to 512 and returns the           *
1008 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1009 *    of magnitude get_free_pages() has an upper order of 9           *
1010 *--------------------------------------------------------------------*/
1011
1012 static int
1013 pages_to_order_of_mag(int num_of_pages)
1014 {
1015         int     order_of_mag=1;         /* assume 2 pages */
1016         int     nump;
1017
1018         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1019         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1020         /* 512 pages = 2Meg on 4k page systems */
1021         if (num_of_pages >= 512) {return 9; }
1022         /* we have two or more pages order is at least 1 */
1023         for (nump=2 ;nump <= 512;nump*=2) {
1024           if (num_of_pages <= nump)
1025                   break;
1026           order_of_mag +=1;
1027         }
1028         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1029         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1030         return order_of_mag;
1031 }
1032
1033 /*-------------------------------------------------------------------*
1034 *                                                                    *
1035 *     add_claw_reads                                                 *
1036 *                                                                    *
1037 *--------------------------------------------------------------------*/
1038 static int
1039 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1040         struct ccwbk* p_last)
1041 {
1042         struct claw_privbk *privptr;
1043         struct ccw1  temp_ccw;
1044         struct endccw * p_end;
1045         CLAW_DBF_TEXT(4, trace, "addreads");
1046         privptr = dev->ml_priv;
1047         p_end = privptr->p_end_ccw;
1048
1049         /* first CCW and last CCW contains a new set of read channel programs
1050         *       to apend the running channel programs
1051         */
1052         if ( p_first==NULL) {
1053                 CLAW_DBF_TEXT(4, trace, "addexit");
1054                 return 0;
1055         }
1056
1057         /* set up ending CCW sequence for this segment */
1058         if (p_end->read1) {
1059                 p_end->read1=0x00;    /*  second ending CCW is now active */
1060                 /*      reset ending CCWs and setup TIC CCWs              */
1061                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1062                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1063                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1064                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1065                 p_end->read2_nop2.cda=0;
1066                 p_end->read2_nop2.count=1;
1067         }
1068         else {
1069                 p_end->read1=0x01;  /* first ending CCW is now active */
1070                 /*      reset ending CCWs and setup TIC CCWs          */
1071                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1072                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1073                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1074                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1075                 p_end->read1_nop2.cda=0;
1076                 p_end->read1_nop2.count=1;
1077         }
1078
1079         if ( privptr-> p_read_active_first ==NULL ) {
1080                 privptr->p_read_active_first = p_first;  /*  set new first */
1081                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1082         }
1083         else {
1084
1085                 /* set up TIC ccw  */
1086                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1087                 temp_ccw.count=0;
1088                 temp_ccw.flags=0;
1089                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1090
1091
1092                 if (p_end->read1) {
1093
1094                /* first set of CCW's is chained to the new read              */
1095                /* chain, so the second set is chained to the active chain.   */
1096                /* Therefore modify the second set to point to the new        */
1097                /* read chain set up TIC CCWs                                 */
1098                /* make sure we update the CCW so channel doesn't fetch it    */
1099                /* when it's only half done                                   */
1100                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1101                                 sizeof(struct ccw1));
1102                         privptr->p_read_active_last->r_TIC_1.cda=
1103                                 (__u32)__pa(&p_first->read);
1104                         privptr->p_read_active_last->r_TIC_2.cda=
1105                                 (__u32)__pa(&p_first->read);
1106                 }
1107                 else {
1108                         /* make sure we update the CCW so channel doesn't   */
1109                         /* fetch it when it is only half done               */
1110                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1111                                 sizeof(struct ccw1));
1112                         privptr->p_read_active_last->r_TIC_1.cda=
1113                                 (__u32)__pa(&p_first->read);
1114                         privptr->p_read_active_last->r_TIC_2.cda=
1115                                 (__u32)__pa(&p_first->read);
1116                 }
1117                 /*      chain in new set of blocks                         */
1118                 privptr->p_read_active_last->next = p_first;
1119                 privptr->p_read_active_last=p_last;
1120         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1121         CLAW_DBF_TEXT(4, trace, "addexit");
1122         return 0;
1123 }    /*     end of add_claw_reads   */
1124
1125 /*-------------------------------------------------------------------*
1126  *   ccw_check_return_code                                           *
1127  *                                                                   *
1128  *-------------------------------------------------------------------*/
1129
1130 static void
1131 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1132 {
1133         CLAW_DBF_TEXT(4, trace, "ccwret");
1134         if (return_code != 0) {
1135                 switch (return_code) {
1136                 case -EBUSY: /* BUSY is a transient state no action needed */
1137                         break;
1138                 case -ENODEV:
1139                         dev_err(&cdev->dev, "The remote channel adapter is not"
1140                                 " available\n");
1141                         break;
1142                 case -EINVAL:
1143                         dev_err(&cdev->dev,
1144                                 "The status of the remote channel adapter"
1145                                 " is not valid\n");
1146                         break;
1147                 default:
1148                         dev_err(&cdev->dev, "The common device layer"
1149                                 " returned error code %d\n",
1150                                   return_code);
1151                 }
1152         }
1153         CLAW_DBF_TEXT(4, trace, "ccwret");
1154 }    /*    end of ccw_check_return_code   */
1155
1156 /*-------------------------------------------------------------------*
1157 *       ccw_check_unit_check                                         *
1158 *--------------------------------------------------------------------*/
1159
1160 static void
1161 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1162 {
1163         struct net_device *ndev = p_ch->ndev;
1164         struct device *dev = &p_ch->cdev->dev;
1165
1166         CLAW_DBF_TEXT(4, trace, "unitchek");
1167         dev_warn(dev, "The communication peer of %s disconnected\n",
1168                 ndev->name);
1169
1170         if (sense & 0x40) {
1171                 if (sense & 0x01) {
1172                         dev_warn(dev, "The remote channel adapter for"
1173                                 " %s has been reset\n",
1174                                 ndev->name);
1175                 }
1176         } else if (sense & 0x20) {
1177                 if (sense & 0x04) {
1178                         dev_warn(dev, "A data streaming timeout occurred"
1179                                 " for %s\n",
1180                                 ndev->name);
1181                 } else if (sense & 0x10) {
1182                         dev_warn(dev, "The remote channel adapter for %s"
1183                                 " is faulty\n",
1184                                 ndev->name);
1185                 } else {
1186                         dev_warn(dev, "A data transfer parity error occurred"
1187                                 " for %s\n",
1188                                 ndev->name);
1189                 }
1190         } else if (sense & 0x10) {
1191                 dev_warn(dev, "A read data parity error occurred"
1192                         " for %s\n",
1193                         ndev->name);
1194         }
1195
1196 }   /*    end of ccw_check_unit_check    */
1197
1198 /*-------------------------------------------------------------------*
1199 *               find_link                                            *
1200 *--------------------------------------------------------------------*/
1201 static int
1202 find_link(struct net_device *dev, char *host_name, char *ws_name )
1203 {
1204         struct claw_privbk *privptr;
1205         struct claw_env *p_env;
1206         int    rc=0;
1207
1208         CLAW_DBF_TEXT(2, setup, "findlink");
1209         privptr = dev->ml_priv;
1210         p_env=privptr->p_env;
1211         switch (p_env->packing)
1212         {
1213                 case  PACKING_ASK:
1214                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1215                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1216                              rc = EINVAL;
1217                         break;
1218                 case  DO_PACKED:
1219                 case  PACK_SEND:
1220                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1221                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1222                                 rc = EINVAL;
1223                         break;
1224                 default:
1225                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1226                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1227                                 rc = EINVAL;
1228                         break;
1229         }
1230
1231         return rc;
1232 }    /*    end of find_link    */
1233
1234 /*-------------------------------------------------------------------*
1235  *   claw_hw_tx                                                      *
1236  *                                                                   *
1237  *                                                                   *
1238  *-------------------------------------------------------------------*/
1239
1240 static int
1241 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1242 {
1243         int                             rc=0;
1244         struct claw_privbk              *privptr;
1245         struct ccwbk           *p_this_ccw;
1246         struct ccwbk           *p_first_ccw;
1247         struct ccwbk           *p_last_ccw;
1248         __u32                           numBuffers;
1249         signed long                     len_of_data;
1250         unsigned long                   bytesInThisBuffer;
1251         unsigned char                   *pDataAddress;
1252         struct endccw                   *pEnd;
1253         struct ccw1                     tempCCW;
1254         struct claw_env                 *p_env;
1255         struct clawph                   *pk_head;
1256         struct chbk                     *ch;
1257
1258         CLAW_DBF_TEXT(4, trace, "hw_tx");
1259         privptr = (struct claw_privbk *)(dev->ml_priv);
1260         p_env =privptr->p_env;
1261         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1262         /*  scan the write queue to free any completed write packets   */
1263         p_first_ccw=NULL;
1264         p_last_ccw=NULL;
1265         if ((p_env->packing >= PACK_SEND) &&
1266             (skb->cb[1] != 'P')) {
1267                 skb_push(skb,sizeof(struct clawph));
1268                 pk_head=(struct clawph *)skb->data;
1269                 pk_head->len=skb->len-sizeof(struct clawph);
1270                 if (pk_head->len%4)  {
1271                         pk_head->len+= 4-(pk_head->len%4);
1272                         skb_pad(skb,4-(pk_head->len%4));
1273                         skb_put(skb,4-(pk_head->len%4));
1274                 }
1275                 if (p_env->packing == DO_PACKED)
1276                         pk_head->link_num = linkid;
1277                 else
1278                         pk_head->link_num = 0;
1279                 pk_head->flag = 0x00;
1280                 skb_pad(skb,4);
1281                 skb->cb[1] = 'P';
1282         }
1283         if (linkid == 0) {
1284                 if (claw_check_busy(dev)) {
1285                         if (privptr->write_free_count!=0) {
1286                                 claw_clear_busy(dev);
1287                         }
1288                         else {
1289                                 claw_strt_out_IO(dev );
1290                                 claw_free_wrt_buf( dev );
1291                                 if (privptr->write_free_count==0) {
1292                                         ch = &privptr->channel[WRITE_CHANNEL];
1293                                         atomic_inc(&skb->users);
1294                                         skb_queue_tail(&ch->collect_queue, skb);
1295                                         goto Done;
1296                                 }
1297                                 else {
1298                                         claw_clear_busy(dev);
1299                                 }
1300                         }
1301                 }
1302                 /*  tx lock  */
1303                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1304                         ch = &privptr->channel[WRITE_CHANNEL];
1305                         atomic_inc(&skb->users);
1306                         skb_queue_tail(&ch->collect_queue, skb);
1307                         claw_strt_out_IO(dev );
1308                         rc=-EBUSY;
1309                         goto Done2;
1310                 }
1311         }
1312         /*      See how many write buffers are required to hold this data */
1313         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1314
1315         /*      If that number of buffers isn't available, give up for now */
1316         if (privptr->write_free_count < numBuffers ||
1317             privptr->p_write_free_chain == NULL ) {
1318
1319                 claw_setbit_busy(TB_NOBUFFER,dev);
1320                 ch = &privptr->channel[WRITE_CHANNEL];
1321                 atomic_inc(&skb->users);
1322                 skb_queue_tail(&ch->collect_queue, skb);
1323                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1324                 goto Done2;
1325         }
1326         pDataAddress=skb->data;
1327         len_of_data=skb->len;
1328
1329         while (len_of_data > 0) {
1330                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1331                 if (p_this_ccw == NULL) { /* lost the race */
1332                         ch = &privptr->channel[WRITE_CHANNEL];
1333                         atomic_inc(&skb->users);
1334                         skb_queue_tail(&ch->collect_queue, skb);
1335                         goto Done2;
1336                 }
1337                 privptr->p_write_free_chain=p_this_ccw->next;
1338                 p_this_ccw->next=NULL;
1339                 --privptr->write_free_count; /* -1 */
1340                 if (len_of_data >= privptr->p_env->write_size)
1341                         bytesInThisBuffer = privptr->p_env->write_size;
1342                 else
1343                         bytesInThisBuffer = len_of_data;
1344                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1345                 len_of_data-=bytesInThisBuffer;
1346                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1347                 /*      setup write CCW         */
1348                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1349                 if (len_of_data>0) {
1350                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1351                 }
1352                 p_this_ccw->write.count=bytesInThisBuffer;
1353                 /*      now add to end of this chain    */
1354                 if (p_first_ccw==NULL)    {
1355                         p_first_ccw=p_this_ccw;
1356                 }
1357                 if (p_last_ccw!=NULL) {
1358                         p_last_ccw->next=p_this_ccw;
1359                         /*      set up TIC ccws         */
1360                         p_last_ccw->w_TIC_1.cda=
1361                                 (__u32)__pa(&p_this_ccw->write);
1362                 }
1363                 p_last_ccw=p_this_ccw;      /* save new last block */
1364         }
1365
1366         /*      FirstCCW and LastCCW now contain a new set of write channel
1367         *       programs to append to the running channel program
1368         */
1369
1370         if (p_first_ccw!=NULL) {
1371                 /*      setup ending ccw sequence for this segment           */
1372                 pEnd=privptr->p_end_ccw;
1373                 if (pEnd->write1) {
1374                         pEnd->write1=0x00;   /* second end ccw is now active */
1375                         /*      set up Tic CCWs         */
1376                         p_last_ccw->w_TIC_1.cda=
1377                                 (__u32)__pa(&pEnd->write2_nop1);
1378                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1379                         pEnd->write2_nop2.flags    =
1380                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1381                         pEnd->write2_nop2.cda=0;
1382                         pEnd->write2_nop2.count=1;
1383                 }
1384                 else {  /*  end of if (pEnd->write1)*/
1385                         pEnd->write1=0x01;   /* first end ccw is now active */
1386                         /*      set up Tic CCWs         */
1387                         p_last_ccw->w_TIC_1.cda=
1388                                 (__u32)__pa(&pEnd->write1_nop1);
1389                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1390                         pEnd->write1_nop2.flags    =
1391                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1392                         pEnd->write1_nop2.cda=0;
1393                         pEnd->write1_nop2.count=1;
1394                 }  /* end if if (pEnd->write1) */
1395
1396                 if (privptr->p_write_active_first==NULL ) {
1397                         privptr->p_write_active_first=p_first_ccw;
1398                         privptr->p_write_active_last=p_last_ccw;
1399                 }
1400                 else {
1401                         /*      set up Tic CCWs         */
1402
1403                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1404                         tempCCW.count=0;
1405                         tempCCW.flags=0;
1406                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1407
1408                         if (pEnd->write1) {
1409
1410                  /*
1411                  * first set of ending CCW's is chained to the new write
1412                  * chain, so the second set is chained to the active chain
1413                  * Therefore modify the second set to point the new write chain.
1414                  * make sure we update the CCW atomically
1415                  * so channel does not fetch it when it's only half done
1416                  */
1417                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1418                                         sizeof(struct ccw1));
1419                                 privptr->p_write_active_last->w_TIC_1.cda=
1420                                         (__u32)__pa(&p_first_ccw->write);
1421                         }
1422                         else {
1423
1424                         /*make sure we update the CCW atomically
1425                          *so channel does not fetch it when it's only half done
1426                          */
1427                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1428                                         sizeof(struct ccw1));
1429                                 privptr->p_write_active_last->w_TIC_1.cda=
1430                                         (__u32)__pa(&p_first_ccw->write);
1431
1432                         } /* end if if (pEnd->write1) */
1433
1434                         privptr->p_write_active_last->next=p_first_ccw;
1435                         privptr->p_write_active_last=p_last_ccw;
1436                 }
1437
1438         } /* endif (p_first_ccw!=NULL)  */
1439         dev_kfree_skb_any(skb);
1440         claw_strt_out_IO(dev );
1441         /*      if write free count is zero , set NOBUFFER       */
1442         if (privptr->write_free_count==0) {
1443                 claw_setbit_busy(TB_NOBUFFER,dev);
1444         }
1445 Done2:
1446         claw_clearbit_busy(TB_TX,dev);
1447 Done:
1448         return(rc);
1449 }    /*    end of claw_hw_tx    */
1450
1451 /*-------------------------------------------------------------------*
1452 *                                                                    *
1453 *     init_ccw_bk                                                    *
1454 *                                                                    *
1455 *--------------------------------------------------------------------*/
1456
1457 static int
1458 init_ccw_bk(struct net_device *dev)
1459 {
1460
1461         __u32   ccw_blocks_required;
1462         __u32   ccw_blocks_perpage;
1463         __u32   ccw_pages_required;
1464         __u32   claw_reads_perpage=1;
1465         __u32   claw_read_pages;
1466         __u32   claw_writes_perpage=1;
1467         __u32   claw_write_pages;
1468         void    *p_buff=NULL;
1469         struct ccwbk*p_free_chain;
1470         struct ccwbk*p_buf;
1471         struct ccwbk*p_last_CCWB;
1472         struct ccwbk*p_first_CCWB;
1473         struct endccw *p_endccw=NULL;
1474         addr_t  real_address;
1475         struct claw_privbk *privptr = dev->ml_priv;
1476         struct clawh *pClawH=NULL;
1477         addr_t   real_TIC_address;
1478         int i,j;
1479         CLAW_DBF_TEXT(4, trace, "init_ccw");
1480
1481         /*  initialize  statistics field */
1482         privptr->active_link_ID=0;
1483         /*  initialize  ccwbk pointers  */
1484         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1485         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1486         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1487         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1488         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1489         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1490         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1491         privptr->buffs_alloc = 0;
1492         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1493         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1494         /*  initialize  free write ccwbk counter  */
1495         privptr->write_free_count=0;  /* number of free bufs on write chain */
1496         p_last_CCWB = NULL;
1497         p_first_CCWB= NULL;
1498         /*
1499         *  We need 1 CCW block for each read buffer, 1 for each
1500         *  write buffer, plus 1 for ClawSignalBlock
1501         */
1502         ccw_blocks_required =
1503                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1504         /*
1505         * compute number of CCW blocks that will fit in a page
1506         */
1507         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1508         ccw_pages_required=
1509                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1510
1511         /*
1512          *  read and write sizes are set by 2 constants in claw.h
1513          *  4k and 32k.  Unpacked values other than 4k are not going to
1514          * provide good performance. With packing buffers support 32k
1515          * buffers are used.
1516          */
1517         if (privptr->p_env->read_size < PAGE_SIZE) {
1518                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1519                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1520                                                 claw_reads_perpage);
1521          }
1522          else {       /* > or equal  */
1523                 privptr->p_buff_pages_perread =
1524                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1525                 claw_read_pages = privptr->p_env->read_buffers *
1526                                         privptr->p_buff_pages_perread;
1527          }
1528         if (privptr->p_env->write_size < PAGE_SIZE) {
1529                 claw_writes_perpage =
1530                         PAGE_SIZE / privptr->p_env->write_size;
1531                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1532                                                 claw_writes_perpage);
1533
1534         }
1535         else {      /* >  or equal  */
1536                 privptr->p_buff_pages_perwrite =
1537                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1538                 claw_write_pages = privptr->p_env->write_buffers *
1539                                         privptr->p_buff_pages_perwrite;
1540         }
1541         /*
1542         *               allocate ccw_pages_required
1543         */
1544         if (privptr->p_buff_ccw==NULL) {
1545                 privptr->p_buff_ccw=
1546                         (void *)__get_free_pages(__GFP_DMA,
1547                         (int)pages_to_order_of_mag(ccw_pages_required ));
1548                 if (privptr->p_buff_ccw==NULL) {
1549                         return -ENOMEM;
1550                 }
1551                 privptr->p_buff_ccw_num=ccw_pages_required;
1552         }
1553         memset(privptr->p_buff_ccw, 0x00,
1554                 privptr->p_buff_ccw_num * PAGE_SIZE);
1555
1556         /*
1557         *               obtain ending ccw block address
1558         *
1559         */
1560         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1561         real_address  = (__u32)__pa(privptr->p_end_ccw);
1562         /*                              Initialize ending CCW block       */
1563         p_endccw=privptr->p_end_ccw;
1564         p_endccw->real=real_address;
1565         p_endccw->write1=0x00;
1566         p_endccw->read1=0x00;
1567
1568         /*      write1_nop1                                     */
1569         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1570         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1571         p_endccw->write1_nop1.count       = 1;
1572         p_endccw->write1_nop1.cda         = 0;
1573
1574         /*      write1_nop2                                     */
1575         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1576         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1577         p_endccw->write1_nop2.count      = 1;
1578         p_endccw->write1_nop2.cda        = 0;
1579
1580         /*      write2_nop1                                     */
1581         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1582         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1583         p_endccw->write2_nop1.count        = 1;
1584         p_endccw->write2_nop1.cda          = 0;
1585
1586         /*      write2_nop2                                     */
1587         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1588         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1589         p_endccw->write2_nop2.count        = 1;
1590         p_endccw->write2_nop2.cda          = 0;
1591
1592         /*      read1_nop1                                      */
1593         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1594         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1595         p_endccw->read1_nop1.count        = 1;
1596         p_endccw->read1_nop1.cda          = 0;
1597
1598         /*      read1_nop2                                      */
1599         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1600         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1601         p_endccw->read1_nop2.count        = 1;
1602         p_endccw->read1_nop2.cda          = 0;
1603
1604         /*      read2_nop1                                      */
1605         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1606         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1607         p_endccw->read2_nop1.count        = 1;
1608         p_endccw->read2_nop1.cda          = 0;
1609
1610         /*      read2_nop2                                      */
1611         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1612         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1613         p_endccw->read2_nop2.count        = 1;
1614         p_endccw->read2_nop2.cda          = 0;
1615
1616         /*
1617         *                               Build a chain of CCWs
1618         *
1619         */
1620         p_buff=privptr->p_buff_ccw;
1621
1622         p_free_chain=NULL;
1623         for (i=0 ; i < ccw_pages_required; i++ ) {
1624                 real_address  = (__u32)__pa(p_buff);
1625                 p_buf=p_buff;
1626                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1627                         p_buf->next  = p_free_chain;
1628                         p_free_chain = p_buf;
1629                         p_buf->real=(__u32)__pa(p_buf);
1630                         ++p_buf;
1631                 }
1632                 p_buff+=PAGE_SIZE;
1633         }
1634         /*
1635         *                               Initialize ClawSignalBlock
1636         *
1637         */
1638         if (privptr->p_claw_signal_blk==NULL) {
1639                 privptr->p_claw_signal_blk=p_free_chain;
1640                 p_free_chain=p_free_chain->next;
1641                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1642                 pClawH->length=0xffff;
1643                 pClawH->opcode=0xff;
1644                 pClawH->flag=CLAW_BUSY;
1645         }
1646
1647         /*
1648         *               allocate write_pages_required and add to free chain
1649         */
1650         if (privptr->p_buff_write==NULL) {
1651             if (privptr->p_env->write_size < PAGE_SIZE) {
1652                 privptr->p_buff_write=
1653                         (void *)__get_free_pages(__GFP_DMA,
1654                         (int)pages_to_order_of_mag(claw_write_pages ));
1655                 if (privptr->p_buff_write==NULL) {
1656                         privptr->p_buff_ccw=NULL;
1657                         return -ENOMEM;
1658                 }
1659                 /*
1660                 *                               Build CLAW write free chain
1661                 *
1662                 */
1663
1664                 memset(privptr->p_buff_write, 0x00,
1665                         ccw_pages_required * PAGE_SIZE);
1666                 privptr->p_write_free_chain=NULL;
1667
1668                 p_buff=privptr->p_buff_write;
1669
1670                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1671                         p_buf        = p_free_chain;      /*  get a CCW */
1672                         p_free_chain = p_buf->next;
1673                         p_buf->next  =privptr->p_write_free_chain;
1674                         privptr->p_write_free_chain = p_buf;
1675                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1676                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1677                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1678                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1679                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1680                         p_buf-> w_read_FF.count   = 1;
1681                         p_buf-> w_read_FF.cda     =
1682                                 (__u32)__pa(&p_buf-> header.flag);
1683                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1684                         p_buf-> w_TIC_1.flags      = 0;
1685                         p_buf-> w_TIC_1.count      = 0;
1686
1687                         if (((unsigned long)p_buff +
1688                                             privptr->p_env->write_size) >=
1689                            ((unsigned long)(p_buff+2*
1690                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1691                                 p_buff = p_buff+privptr->p_env->write_size;
1692                         }
1693                 }
1694            }
1695            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1696            {
1697                privptr->p_write_free_chain=NULL;
1698                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1699                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1700                         (int)pages_to_order_of_mag(
1701                         privptr->p_buff_pages_perwrite) );
1702                    if (p_buff==NULL) {
1703                         free_pages((unsigned long)privptr->p_buff_ccw,
1704                               (int)pages_to_order_of_mag(
1705                                         privptr->p_buff_ccw_num));
1706                         privptr->p_buff_ccw=NULL;
1707                         p_buf=privptr->p_buff_write;
1708                         while (p_buf!=NULL) {
1709                                 free_pages((unsigned long)
1710                                         p_buf->p_buffer,
1711                                         (int)pages_to_order_of_mag(
1712                                         privptr->p_buff_pages_perwrite));
1713                                 p_buf=p_buf->next;
1714                         }
1715                         return -ENOMEM;
1716                    }  /* Error on get_pages   */
1717                    memset(p_buff, 0x00, privptr->p_env->write_size );
1718                    p_buf         = p_free_chain;
1719                    p_free_chain  = p_buf->next;
1720                    p_buf->next   = privptr->p_write_free_chain;
1721                    privptr->p_write_free_chain = p_buf;
1722                    privptr->p_buff_write = p_buf;
1723                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1724                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1725                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1726                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1727                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1728                    p_buf-> w_read_FF.count    = 1;
1729                    p_buf-> w_read_FF.cda      =
1730                         (__u32)__pa(&p_buf-> header.flag);
1731                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1732                    p_buf-> w_TIC_1.flags   = 0;
1733                    p_buf-> w_TIC_1.count   = 0;
1734                }  /* for all write_buffers   */
1735
1736            }    /* else buffers are PAGE_SIZE or bigger */
1737
1738         }
1739         privptr->p_buff_write_num=claw_write_pages;
1740         privptr->write_free_count=privptr->p_env->write_buffers;
1741
1742
1743         /*
1744         *               allocate read_pages_required and chain to free chain
1745         */
1746         if (privptr->p_buff_read==NULL) {
1747             if (privptr->p_env->read_size < PAGE_SIZE)  {
1748                 privptr->p_buff_read=
1749                         (void *)__get_free_pages(__GFP_DMA,
1750                         (int)pages_to_order_of_mag(claw_read_pages) );
1751                 if (privptr->p_buff_read==NULL) {
1752                         free_pages((unsigned long)privptr->p_buff_ccw,
1753                                 (int)pages_to_order_of_mag(
1754                                         privptr->p_buff_ccw_num));
1755                         /* free the write pages size is < page size  */
1756                         free_pages((unsigned long)privptr->p_buff_write,
1757                                 (int)pages_to_order_of_mag(
1758                                 privptr->p_buff_write_num));
1759                         privptr->p_buff_ccw=NULL;
1760                         privptr->p_buff_write=NULL;
1761                         return -ENOMEM;
1762                 }
1763                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1764                 privptr->p_buff_read_num=claw_read_pages;
1765                 /*
1766                 *                               Build CLAW read free chain
1767                 *
1768                 */
1769                 p_buff=privptr->p_buff_read;
1770                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1771                         p_buf        = p_free_chain;
1772                         p_free_chain = p_buf->next;
1773
1774                         if (p_last_CCWB==NULL) {
1775                                 p_buf->next=NULL;
1776                                 real_TIC_address=0;
1777                                 p_last_CCWB=p_buf;
1778                         }
1779                         else {
1780                                 p_buf->next=p_first_CCWB;
1781                                 real_TIC_address=
1782                                 (__u32)__pa(&p_first_CCWB -> read );
1783                         }
1784
1785                         p_first_CCWB=p_buf;
1786
1787                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1788                         /*  initialize read command */
1789                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1790                         p_buf-> read.cda = (__u32)__pa(p_buff);
1791                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1792                         p_buf-> read.count       = privptr->p_env->read_size;
1793
1794                         /*  initialize read_h command */
1795                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1796                         p_buf-> read_h.cda =
1797                                 (__u32)__pa(&(p_buf->header));
1798                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1799                         p_buf-> read_h.count      = sizeof(struct clawh);
1800
1801                         /*  initialize Signal command */
1802                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1803                         p_buf-> signal.cda =
1804                                 (__u32)__pa(&(pClawH->flag));
1805                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1806                         p_buf-> signal.count     = 1;
1807
1808                         /*  initialize r_TIC_1 command */
1809                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1810                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1811                         p_buf-> r_TIC_1.flags = 0;
1812                         p_buf-> r_TIC_1.count      = 0;
1813
1814                         /*  initialize r_read_FF command */
1815                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1816                         p_buf-> r_read_FF.cda =
1817                                 (__u32)__pa(&(pClawH->flag));
1818                         p_buf-> r_read_FF.flags =
1819                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1820                         p_buf-> r_read_FF.count    = 1;
1821
1822                         /*    initialize r_TIC_2          */
1823                         memcpy(&p_buf->r_TIC_2,
1824                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1825
1826                         /*     initialize Header     */
1827                         p_buf->header.length=0xffff;
1828                         p_buf->header.opcode=0xff;
1829                         p_buf->header.flag=CLAW_PENDING;
1830
1831                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1832                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1833                                  -1)
1834                            & PAGE_MASK)) {
1835                                 p_buff= p_buff+privptr->p_env->read_size;
1836                         }
1837                         else {
1838                                 p_buff=
1839                                 (void *)((unsigned long)
1840                                         (p_buff+2*(privptr->p_env->read_size)-1)
1841                                          & PAGE_MASK) ;
1842                         }
1843                 }   /* for read_buffers   */
1844           }         /* read_size < PAGE_SIZE  */
1845           else {  /* read Size >= PAGE_SIZE  */
1846                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1847                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1848                                 (int)pages_to_order_of_mag(
1849                                         privptr->p_buff_pages_perread));
1850                         if (p_buff==NULL) {
1851                                 free_pages((unsigned long)privptr->p_buff_ccw,
1852                                         (int)pages_to_order_of_mag(privptr->
1853                                         p_buff_ccw_num));
1854                                 /* free the write pages  */
1855                                 p_buf=privptr->p_buff_write;
1856                                 while (p_buf!=NULL) {
1857                                         free_pages(
1858                                             (unsigned long)p_buf->p_buffer,
1859                                             (int)pages_to_order_of_mag(
1860                                             privptr->p_buff_pages_perwrite));
1861                                         p_buf=p_buf->next;
1862                                 }
1863                                 /* free any read pages already alloc  */
1864                                 p_buf=privptr->p_buff_read;
1865                                 while (p_buf!=NULL) {
1866                                         free_pages(
1867                                             (unsigned long)p_buf->p_buffer,
1868                                             (int)pages_to_order_of_mag(
1869                                              privptr->p_buff_pages_perread));
1870                                         p_buf=p_buf->next;
1871                                 }
1872                                 privptr->p_buff_ccw=NULL;
1873                                 privptr->p_buff_write=NULL;
1874                                 return -ENOMEM;
1875                         }
1876                         memset(p_buff, 0x00, privptr->p_env->read_size);
1877                         p_buf        = p_free_chain;
1878                         privptr->p_buff_read = p_buf;
1879                         p_free_chain = p_buf->next;
1880
1881                         if (p_last_CCWB==NULL) {
1882                                 p_buf->next=NULL;
1883                                 real_TIC_address=0;
1884                                 p_last_CCWB=p_buf;
1885                         }
1886                         else {
1887                                 p_buf->next=p_first_CCWB;
1888                                 real_TIC_address=
1889                                         (addr_t)__pa(
1890                                                 &p_first_CCWB -> read );
1891                         }
1892
1893                         p_first_CCWB=p_buf;
1894                                 /* save buff address */
1895                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1896                         /*  initialize read command */
1897                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1898                         p_buf-> read.cda = (__u32)__pa(p_buff);
1899                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1900                         p_buf-> read.count       = privptr->p_env->read_size;
1901
1902                         /*  initialize read_h command */
1903                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1904                         p_buf-> read_h.cda =
1905                                 (__u32)__pa(&(p_buf->header));
1906                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1907                         p_buf-> read_h.count      = sizeof(struct clawh);
1908
1909                         /*  initialize Signal command */
1910                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1911                         p_buf-> signal.cda =
1912                                 (__u32)__pa(&(pClawH->flag));
1913                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1914                         p_buf-> signal.count     = 1;
1915
1916                         /*  initialize r_TIC_1 command */
1917                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1918                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1919                         p_buf-> r_TIC_1.flags = 0;
1920                         p_buf-> r_TIC_1.count      = 0;
1921
1922                         /*  initialize r_read_FF command */
1923                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1924                         p_buf-> r_read_FF.cda =
1925                                 (__u32)__pa(&(pClawH->flag));
1926                         p_buf-> r_read_FF.flags =
1927                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1928                         p_buf-> r_read_FF.count    = 1;
1929
1930                         /*    initialize r_TIC_2          */
1931                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1932                                 sizeof(struct ccw1));
1933
1934                         /*     initialize Header     */
1935                         p_buf->header.length=0xffff;
1936                         p_buf->header.opcode=0xff;
1937                         p_buf->header.flag=CLAW_PENDING;
1938
1939                 }    /* For read_buffers   */
1940           }     /*  read_size >= PAGE_SIZE   */
1941         }       /*  pBuffread = NULL */
1942         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1943         privptr->buffs_alloc = 1;
1944
1945         return 0;
1946 }    /*    end of init_ccw_bk */
1947
1948 /*-------------------------------------------------------------------*
1949 *                                                                    *
1950 *       probe_error                                                  *
1951 *                                                                    *
1952 *--------------------------------------------------------------------*/
1953
1954 static void
1955 probe_error( struct ccwgroup_device *cgdev)
1956 {
1957         struct claw_privbk *privptr;
1958
1959         CLAW_DBF_TEXT(4, trace, "proberr");
1960         privptr = dev_get_drvdata(&cgdev->dev);
1961         if (privptr != NULL) {
1962                 dev_set_drvdata(&cgdev->dev, NULL);
1963                 kfree(privptr->p_env);
1964                 kfree(privptr->p_mtc_envelope);
1965                 kfree(privptr);
1966         }
1967 }    /*    probe_error    */
1968
1969 /*-------------------------------------------------------------------*
1970 *    claw_process_control                                            *
1971 *                                                                    *
1972 *                                                                    *
1973 *--------------------------------------------------------------------*/
1974
1975 static int
1976 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1977 {
1978
1979         struct clawbuf *p_buf;
1980         struct clawctl  ctlbk;
1981         struct clawctl *p_ctlbk;
1982         char    temp_host_name[8];
1983         char    temp_ws_name[8];
1984         struct claw_privbk *privptr;
1985         struct claw_env *p_env;
1986         struct sysval *p_sysval;
1987         struct conncmd *p_connect=NULL;
1988         int rc;
1989         struct chbk *p_ch = NULL;
1990         struct device *tdev;
1991         CLAW_DBF_TEXT(2, setup, "clw_cntl");
1992         udelay(1000);  /* Wait a ms for the control packets to
1993                         *catch up to each other */
1994         privptr = dev->ml_priv;
1995         p_env=privptr->p_env;
1996         tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
1997         memcpy( &temp_host_name, p_env->host_name, 8);
1998         memcpy( &temp_ws_name, p_env->adapter_name , 8);
1999         dev_info(tdev, "%s: CLAW device %.8s: "
2000                 "Received Control Packet\n",
2001                 dev->name, temp_ws_name);
2002         if (privptr->release_pend==1) {
2003                 return 0;
2004         }
2005         p_buf=p_ccw->p_buffer;
2006         p_ctlbk=&ctlbk;
2007         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2008                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2009         } else {
2010                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2011         }
2012         switch (p_ctlbk->command)
2013         {
2014         case SYSTEM_VALIDATE_REQUEST:
2015                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2016                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2017                                 CLAW_RC_WRONG_VERSION);
2018                         dev_warn(tdev, "The communication peer of %s"
2019                                 " uses an incorrect API version %d\n",
2020                                 dev->name, p_ctlbk->version);
2021                 }
2022                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2023                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2024                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2025                         "Host name=%.8s\n",
2026                         dev->name, p_ctlbk->version,
2027                         p_ctlbk->linkid,
2028                         p_ctlbk->correlator,
2029                         p_sysval->WS_name,
2030                         p_sysval->host_name);
2031                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2032                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2033                                 CLAW_RC_NAME_MISMATCH);
2034                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2035                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2036                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2037                         dev_warn(tdev,
2038                                 "Host name %s for %s does not match the"
2039                                 " remote adapter name %s\n",
2040                                 p_sysval->host_name,
2041                                 dev->name,
2042                                 temp_host_name);
2043                 }
2044                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2045                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2046                                 CLAW_RC_NAME_MISMATCH);
2047                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2048                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2049                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2050                         dev_warn(tdev, "Adapter name %s for %s does not match"
2051                                 " the remote host name %s\n",
2052                                 p_sysval->WS_name,
2053                                 dev->name,
2054                                 temp_ws_name);
2055                 }
2056                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2057                     (p_env->packing == 0)) {
2058                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2059                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2060                         dev_warn(tdev,
2061                                 "The local write buffer is smaller than the"
2062                                 " remote read buffer\n");
2063                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2064                 }
2065                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2066                     (p_env->packing == 0)) {
2067                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2068                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2069                         dev_warn(tdev,
2070                                 "The local read buffer is smaller than the"
2071                                 " remote write buffer\n");
2072                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2073                 }
2074                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2075                 dev_info(tdev,
2076                         "CLAW device %.8s: System validate"
2077                         " completed.\n", temp_ws_name);
2078                 dev_info(tdev,
2079                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2080                         dev->name, p_sysval->read_frame_size,
2081                         p_sysval->write_frame_size);
2082                 privptr->system_validate_comp = 1;
2083                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2084                         p_env->packing = PACKING_ASK;
2085                 claw_strt_conn_req(dev);
2086                 break;
2087         case SYSTEM_VALIDATE_RESPONSE:
2088                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2089                 dev_info(tdev,
2090                         "Settings for %s validated (version=%d, "
2091                         "remote device=%d, rc=%d, adapter name=%.8s, "
2092                         "host name=%.8s)\n",
2093                         dev->name,
2094                         p_ctlbk->version,
2095                         p_ctlbk->correlator,
2096                         p_ctlbk->rc,
2097                         p_sysval->WS_name,
2098                         p_sysval->host_name);
2099                 switch (p_ctlbk->rc) {
2100                 case 0:
2101                         dev_info(tdev, "%s: CLAW device "
2102                                 "%.8s: System validate completed.\n",
2103                                 dev->name, temp_ws_name);
2104                         if (privptr->system_validate_comp == 0)
2105                                 claw_strt_conn_req(dev);
2106                         privptr->system_validate_comp = 1;
2107                         break;
2108                 case CLAW_RC_NAME_MISMATCH:
2109                         dev_warn(tdev, "Validating %s failed because of"
2110                                 " a host or adapter name mismatch\n",
2111                                 dev->name);
2112                         break;
2113                 case CLAW_RC_WRONG_VERSION:
2114                         dev_warn(tdev, "Validating %s failed because of a"
2115                                 " version conflict\n",
2116                                 dev->name);
2117                         break;
2118                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2119                         dev_warn(tdev, "Validating %s failed because of a"
2120                                 " frame size conflict\n",
2121                                 dev->name);
2122                         break;
2123                 default:
2124                         dev_warn(tdev, "The communication peer of %s rejected"
2125                                 " the connection\n",
2126                                  dev->name);
2127                         break;
2128                 }
2129                 break;
2130
2131         case CONNECTION_REQUEST:
2132                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2133                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2134                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2135                         dev->name,
2136                         p_ctlbk->version,
2137                         p_ctlbk->linkid,
2138                         p_ctlbk->correlator,
2139                         p_connect->host_name,
2140                         p_connect->WS_name);
2141                 if (privptr->active_link_ID != 0) {
2142                         claw_snd_disc(dev, p_ctlbk);
2143                         dev_info(tdev, "%s rejected a connection request"
2144                                 " because it is already active\n",
2145                                 dev->name);
2146                 }
2147                 if (p_ctlbk->linkid != 1) {
2148                         claw_snd_disc(dev, p_ctlbk);
2149                         dev_info(tdev, "%s rejected a request to open multiple"
2150                                 " connections\n",
2151                                 dev->name);
2152                 }
2153                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2154                 if (rc != 0) {
2155                         claw_snd_disc(dev, p_ctlbk);
2156                         dev_info(tdev, "%s rejected a connection request"
2157                                 " because of a type mismatch\n",
2158                                 dev->name);
2159                 }
2160                 claw_send_control(dev,
2161                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2162                         p_ctlbk->correlator,
2163                         0, p_connect->host_name,
2164                         p_connect->WS_name);
2165                 if (p_env->packing == PACKING_ASK) {
2166                         p_env->packing = PACK_SEND;
2167                         claw_snd_conn_req(dev, 0);
2168                 }
2169                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2170                         "completed link_id=%d.\n",
2171                         dev->name, temp_ws_name,
2172                         p_ctlbk->linkid);
2173                         privptr->active_link_ID = p_ctlbk->linkid;
2174                         p_ch = &privptr->channel[WRITE_CHANNEL];
2175                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2176                 break;
2177         case CONNECTION_RESPONSE:
2178                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2179                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2180                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2181                         dev->name,
2182                         p_ctlbk->version,
2183                         p_ctlbk->linkid,
2184                         p_ctlbk->correlator,
2185                         p_ctlbk->rc,
2186                         p_connect->host_name,
2187                         p_connect->WS_name);
2188
2189                 if (p_ctlbk->rc != 0) {
2190                         dev_warn(tdev, "The communication peer of %s rejected"
2191                                 " a connection request\n",
2192                                 dev->name);
2193                         return 1;
2194                 }
2195                 rc = find_link(dev,
2196                         p_connect->host_name, p_connect->WS_name);
2197                 if (rc != 0) {
2198                         claw_snd_disc(dev, p_ctlbk);
2199                         dev_warn(tdev, "The communication peer of %s"
2200                                 " rejected a connection "
2201                                 "request because of a type mismatch\n",
2202                                  dev->name);
2203                 }
2204                 /* should be until CONNECTION_CONFIRM */
2205                 privptr->active_link_ID = -(p_ctlbk->linkid);
2206                 break;
2207         case CONNECTION_CONFIRM:
2208                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2209                 dev_info(tdev,
2210                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2211                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2212                         dev->name,
2213                         p_ctlbk->version,
2214                         p_ctlbk->linkid,
2215                         p_ctlbk->correlator,
2216                         p_connect->host_name,
2217                         p_connect->WS_name);
2218                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2219                         privptr->active_link_ID = p_ctlbk->linkid;
2220                         if (p_env->packing > PACKING_ASK) {
2221                                 dev_info(tdev,
2222                                 "%s: Confirmed Now packing\n", dev->name);
2223                                 p_env->packing = DO_PACKED;
2224                         }
2225                         p_ch = &privptr->channel[WRITE_CHANNEL];
2226                         wake_up(&p_ch->wait);
2227                 } else {
2228                         dev_warn(tdev, "Activating %s failed because of"
2229                                 " an incorrect link ID=%d\n",
2230                                 dev->name, p_ctlbk->linkid);
2231                         claw_snd_disc(dev, p_ctlbk);
2232                 }
2233                 break;
2234         case DISCONNECT:
2235                 dev_info(tdev, "%s: Disconnect: "
2236                         "Vers=%d,link_id=%d,Corr=%d\n",
2237                         dev->name, p_ctlbk->version,
2238                         p_ctlbk->linkid, p_ctlbk->correlator);
2239                 if ((p_ctlbk->linkid == 2) &&
2240                     (p_env->packing == PACK_SEND)) {
2241                         privptr->active_link_ID = 1;
2242                         p_env->packing = DO_PACKED;
2243                 } else
2244                         privptr->active_link_ID = 0;
2245                 break;
2246         case CLAW_ERROR:
2247                 dev_warn(tdev, "The communication peer of %s failed\n",
2248                         dev->name);
2249                 break;
2250         default:
2251                 dev_warn(tdev, "The communication peer of %s sent"
2252                         " an unknown command code\n",
2253                         dev->name);
2254                 break;
2255         }
2256
2257         return 0;
2258 }   /*    end of claw_process_control    */
2259
2260
2261 /*-------------------------------------------------------------------*
2262 *               claw_send_control                                    *
2263 *                                                                    *
2264 *--------------------------------------------------------------------*/
2265
2266 static int
2267 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2268          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2269 {
2270         struct claw_privbk              *privptr;
2271         struct clawctl                  *p_ctl;
2272         struct sysval                   *p_sysval;
2273         struct conncmd                  *p_connect;
2274         struct sk_buff                  *skb;
2275
2276         CLAW_DBF_TEXT(2, setup, "sndcntl");
2277         privptr = dev->ml_priv;
2278         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2279
2280         p_ctl->command=type;
2281         p_ctl->version=CLAW_VERSION_ID;
2282         p_ctl->linkid=link;
2283         p_ctl->correlator=correlator;
2284         p_ctl->rc=rc;
2285
2286         p_sysval=(struct sysval *)&p_ctl->data;
2287         p_connect=(struct conncmd *)&p_ctl->data;
2288
2289         switch (p_ctl->command) {
2290                 case SYSTEM_VALIDATE_REQUEST:
2291                 case SYSTEM_VALIDATE_RESPONSE:
2292                         memcpy(&p_sysval->host_name, local_name, 8);
2293                         memcpy(&p_sysval->WS_name, remote_name, 8);
2294                         if (privptr->p_env->packing > 0) {
2295                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2296                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2297                         } else {
2298                                 /* how big is the biggest group of packets */
2299                            p_sysval->read_frame_size =
2300                                 privptr->p_env->read_size;
2301                            p_sysval->write_frame_size =
2302                                 privptr->p_env->write_size;
2303                         }
2304                         memset(&p_sysval->reserved, 0x00, 4);
2305                         break;
2306                 case CONNECTION_REQUEST:
2307                 case CONNECTION_RESPONSE:
2308                 case CONNECTION_CONFIRM:
2309                 case DISCONNECT:
2310                         memcpy(&p_sysval->host_name, local_name, 8);
2311                         memcpy(&p_sysval->WS_name, remote_name, 8);
2312                         if (privptr->p_env->packing > 0) {
2313                         /* How big is the biggest packet */
2314                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2315                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2316                         } else {
2317                                 memset(&p_connect->reserved1, 0x00, 4);
2318                                 memset(&p_connect->reserved2, 0x00, 4);
2319                         }
2320                         break;
2321                 default:
2322                         break;
2323         }
2324
2325         /*      write Control Record to the device                   */
2326
2327
2328         skb = dev_alloc_skb(sizeof(struct clawctl));
2329         if (!skb) {
2330                 return -ENOMEM;
2331         }
2332         memcpy(skb_put(skb, sizeof(struct clawctl)),
2333                 p_ctl, sizeof(struct clawctl));
2334         if (privptr->p_env->packing >= PACK_SEND)
2335                 claw_hw_tx(skb, dev, 1);
2336         else
2337                 claw_hw_tx(skb, dev, 0);
2338         return 0;
2339 }  /*   end of claw_send_control  */
2340
2341 /*-------------------------------------------------------------------*
2342 *               claw_snd_conn_req                                    *
2343 *                                                                    *
2344 *--------------------------------------------------------------------*/
2345 static int
2346 claw_snd_conn_req(struct net_device *dev, __u8 link)
2347 {
2348         int                rc;
2349         struct claw_privbk *privptr = dev->ml_priv;
2350         struct clawctl     *p_ctl;
2351
2352         CLAW_DBF_TEXT(2, setup, "snd_conn");
2353         rc = 1;
2354         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2355         p_ctl->linkid = link;
2356         if ( privptr->system_validate_comp==0x00 ) {
2357                 return rc;
2358         }
2359         if (privptr->p_env->packing == PACKING_ASK )
2360                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2361                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2362         if (privptr->p_env->packing == PACK_SEND)  {
2363                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2364                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2365         }
2366         if (privptr->p_env->packing == 0)
2367                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2368                         HOST_APPL_NAME, privptr->p_env->api_type);
2369         return rc;
2370
2371 }  /*  end of claw_snd_conn_req */
2372
2373
2374 /*-------------------------------------------------------------------*
2375 *               claw_snd_disc                                        *
2376 *                                                                    *
2377 *--------------------------------------------------------------------*/
2378
2379 static int
2380 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2381 {
2382         int rc;
2383         struct conncmd *  p_connect;
2384
2385         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2386         p_connect=(struct conncmd *)&p_ctl->data;
2387
2388         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2389                 p_ctl->correlator, 0,
2390                 p_connect->host_name, p_connect->WS_name);
2391         return rc;
2392 }     /*   end of claw_snd_disc    */
2393
2394
2395 /*-------------------------------------------------------------------*
2396 *               claw_snd_sys_validate_rsp                            *
2397 *                                                                    *
2398 *--------------------------------------------------------------------*/
2399
2400 static int
2401 claw_snd_sys_validate_rsp(struct net_device *dev,
2402         struct clawctl *p_ctl, __u32 return_code)
2403 {
2404         struct claw_env *  p_env;
2405         struct claw_privbk *privptr;
2406         int    rc;
2407
2408         CLAW_DBF_TEXT(2, setup, "chkresp");
2409         privptr = dev->ml_priv;
2410         p_env=privptr->p_env;
2411         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2412                 p_ctl->linkid,
2413                 p_ctl->correlator,
2414                 return_code,
2415                 p_env->host_name,
2416                 p_env->adapter_name  );
2417         return rc;
2418 }     /*    end of claw_snd_sys_validate_rsp    */
2419
2420 /*-------------------------------------------------------------------*
2421 *               claw_strt_conn_req                                   *
2422 *                                                                    *
2423 *--------------------------------------------------------------------*/
2424
2425 static int
2426 claw_strt_conn_req(struct net_device *dev )
2427 {
2428         int rc;
2429
2430         CLAW_DBF_TEXT(2, setup, "conn_req");
2431         rc=claw_snd_conn_req(dev, 1);
2432         return rc;
2433 }    /*   end of claw_strt_conn_req   */
2434
2435
2436
2437 /*-------------------------------------------------------------------*
2438  *   claw_stats                                                      *
2439  *-------------------------------------------------------------------*/
2440
2441 static struct
2442 net_device_stats *claw_stats(struct net_device *dev)
2443 {
2444         struct claw_privbk *privptr;
2445
2446         CLAW_DBF_TEXT(4, trace, "stats");
2447         privptr = dev->ml_priv;
2448         return &privptr->stats;
2449 }     /*   end of claw_stats   */
2450
2451
2452 /*-------------------------------------------------------------------*
2453 *       unpack_read                                                  *
2454 *                                                                    *
2455 *--------------------------------------------------------------------*/
2456 static void
2457 unpack_read(struct net_device *dev )
2458 {
2459         struct sk_buff *skb;
2460         struct claw_privbk *privptr;
2461         struct claw_env    *p_env;
2462         struct ccwbk    *p_this_ccw;
2463         struct ccwbk    *p_first_ccw;
2464         struct ccwbk    *p_last_ccw;
2465         struct clawph   *p_packh;
2466         void            *p_packd;
2467         struct clawctl  *p_ctlrec=NULL;
2468         struct device   *p_dev;
2469
2470         __u32   len_of_data;
2471         __u32   pack_off;
2472         __u8    link_num;
2473         __u8    mtc_this_frm=0;
2474         __u32   bytes_to_mov;
2475         int     i=0;
2476         int     p=0;
2477
2478         CLAW_DBF_TEXT(4, trace, "unpkread");
2479         p_first_ccw=NULL;
2480         p_last_ccw=NULL;
2481         p_packh=NULL;
2482         p_packd=NULL;
2483         privptr = dev->ml_priv;
2484
2485         p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2486         p_env = privptr->p_env;
2487         p_this_ccw=privptr->p_read_active_first;
2488         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2489                 pack_off = 0;
2490                 p = 0;
2491                 p_this_ccw->header.flag=CLAW_PENDING;
2492                 privptr->p_read_active_first=p_this_ccw->next;
2493                 p_this_ccw->next=NULL;
2494                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2495                 if ((p_env->packing == PACK_SEND) &&
2496                     (p_packh->len == 32)           &&
2497                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2498                         p_packh++;  /* peek past pack header */
2499                         p_ctlrec = (struct clawctl *)p_packh;
2500                         p_packh--;  /* un peek */
2501                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2502                             (p_ctlrec->command == CONNECTION_CONFIRM))
2503                                 p_env->packing = DO_PACKED;
2504                 }
2505                 if (p_env->packing == DO_PACKED)
2506                         link_num=p_packh->link_num;
2507                 else
2508                         link_num=p_this_ccw->header.opcode / 8;
2509                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2510                         mtc_this_frm=1;
2511                         if (p_this_ccw->header.length!=
2512                                 privptr->p_env->read_size ) {
2513                                 dev_warn(p_dev,
2514                                         "The communication peer of %s"
2515                                         " sent a faulty"
2516                                         " frame of length %02x\n",
2517                                         dev->name, p_this_ccw->header.length);
2518                         }
2519                 }
2520
2521                 if (privptr->mtc_skipping) {
2522                         /*
2523                         *   We're in the mode of skipping past a
2524                         *   multi-frame message
2525                         *   that we can't process for some reason or other.
2526                         *   The first frame without the More-To-Come flag is
2527                         *   the last frame of the skipped message.
2528                         */
2529                         /*  in case of More-To-Come not set in this frame */
2530                         if (mtc_this_frm==0) {
2531                                 privptr->mtc_skipping=0; /* Ok, the end */
2532                                 privptr->mtc_logical_link=-1;
2533                         }
2534                         goto NextFrame;
2535                 }
2536
2537                 if (link_num==0) {
2538                         claw_process_control(dev, p_this_ccw);
2539                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2540                         goto NextFrame;
2541                 }
2542 unpack_next:
2543                 if (p_env->packing == DO_PACKED) {
2544                         if (pack_off > p_env->read_size)
2545                                 goto NextFrame;
2546                         p_packd = p_this_ccw->p_buffer+pack_off;
2547                         p_packh = (struct clawph *) p_packd;
2548                         if ((p_packh->len == 0) || /* done with this frame? */
2549                             (p_packh->flag != 0))
2550                                 goto NextFrame;
2551                         bytes_to_mov = p_packh->len;
2552                         pack_off += bytes_to_mov+sizeof(struct clawph);
2553                         p++;
2554                 } else {
2555                         bytes_to_mov=p_this_ccw->header.length;
2556                 }
2557                 if (privptr->mtc_logical_link<0) {
2558
2559                 /*
2560                 *  if More-To-Come is set in this frame then we don't know
2561                 *  length of entire message, and hence have to allocate
2562                 *  large buffer   */
2563
2564                 /*      We are starting a new envelope  */
2565                 privptr->mtc_offset=0;
2566                         privptr->mtc_logical_link=link_num;
2567                 }
2568
2569                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2570                         /*      error     */
2571                         privptr->stats.rx_frame_errors++;
2572                         goto NextFrame;
2573                 }
2574                 if (p_env->packing == DO_PACKED) {
2575                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2576                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2577
2578                 } else  {
2579                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2580                                 p_this_ccw->p_buffer, bytes_to_mov);
2581                 }
2582                 if (mtc_this_frm==0) {
2583                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2584                         skb=dev_alloc_skb(len_of_data);
2585                         if (skb) {
2586                                 memcpy(skb_put(skb,len_of_data),
2587                                         privptr->p_mtc_envelope,
2588                                         len_of_data);
2589                                 skb->dev=dev;
2590                                 skb_reset_mac_header(skb);
2591                                 skb->protocol=htons(ETH_P_IP);
2592                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2593                                 privptr->stats.rx_packets++;
2594                                 privptr->stats.rx_bytes+=len_of_data;
2595                                 netif_rx(skb);
2596                         }
2597                         else {
2598                                 dev_info(p_dev, "Allocating a buffer for"
2599                                         " incoming data failed\n");
2600                                 privptr->stats.rx_dropped++;
2601                         }
2602                         privptr->mtc_offset=0;
2603                         privptr->mtc_logical_link=-1;
2604                 }
2605                 else {
2606                         privptr->mtc_offset+=bytes_to_mov;
2607                 }
2608                 if (p_env->packing == DO_PACKED)
2609                         goto unpack_next;
2610 NextFrame:
2611                 /*
2612                 *   Remove ThisCCWblock from active read queue, and add it
2613                 *   to queue of free blocks to be reused.
2614                 */
2615                 i++;
2616                 p_this_ccw->header.length=0xffff;
2617                 p_this_ccw->header.opcode=0xff;
2618                 /*
2619                 *       add this one to the free queue for later reuse
2620                 */
2621                 if (p_first_ccw==NULL) {
2622                         p_first_ccw = p_this_ccw;
2623                 }
2624                 else {
2625                         p_last_ccw->next = p_this_ccw;
2626                 }
2627                 p_last_ccw = p_this_ccw;
2628                 /*
2629                 *       chain to next block on active read queue
2630                 */
2631                 p_this_ccw = privptr->p_read_active_first;
2632                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2633         } /* end of while */
2634
2635         /*      check validity                  */
2636
2637         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2638         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2639         claw_strt_read(dev, LOCK_YES);
2640         return;
2641 }     /*  end of unpack_read   */
2642
2643 /*-------------------------------------------------------------------*
2644 *       claw_strt_read                                               *
2645 *                                                                    *
2646 *--------------------------------------------------------------------*/
2647 static void
2648 claw_strt_read (struct net_device *dev, int lock )
2649 {
2650         int        rc = 0;
2651         __u32      parm;
2652         unsigned long  saveflags = 0;
2653         struct claw_privbk *privptr = dev->ml_priv;
2654         struct ccwbk*p_ccwbk;
2655         struct chbk *p_ch;
2656         struct clawh *p_clawh;
2657         p_ch = &privptr->channel[READ_CHANNEL];
2658
2659         CLAW_DBF_TEXT(4, trace, "StRdNter");
2660         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2661         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2662
2663         if ((privptr->p_write_active_first!=NULL &&
2664              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2665             (privptr->p_read_active_first!=NULL &&
2666              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2667                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2668         }
2669         if (lock==LOCK_YES) {
2670                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2671         }
2672         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2673                 CLAW_DBF_TEXT(4, trace, "HotRead");
2674                 p_ccwbk=privptr->p_read_active_first;
2675                 parm = (unsigned long) p_ch;
2676                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2677                                        0xff, 0);
2678                 if (rc != 0) {
2679                         ccw_check_return_code(p_ch->cdev, rc);
2680                 }
2681         }
2682         else {
2683                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2684         }
2685
2686         if (lock==LOCK_YES) {
2687                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2688         }
2689         CLAW_DBF_TEXT(4, trace, "StRdExit");
2690         return;
2691 }       /*    end of claw_strt_read    */
2692
2693 /*-------------------------------------------------------------------*
2694 *       claw_strt_out_IO                                             *
2695 *                                                                    *
2696 *--------------------------------------------------------------------*/
2697
2698 static void
2699 claw_strt_out_IO( struct net_device *dev )
2700 {
2701         int                     rc = 0;
2702         unsigned long           parm;
2703         struct claw_privbk      *privptr;
2704         struct chbk             *p_ch;
2705         struct ccwbk    *p_first_ccw;
2706
2707         if (!dev) {
2708                 return;
2709         }
2710         privptr = (struct claw_privbk *)dev->ml_priv;
2711         p_ch = &privptr->channel[WRITE_CHANNEL];
2712
2713         CLAW_DBF_TEXT(4, trace, "strt_io");
2714         p_first_ccw=privptr->p_write_active_first;
2715
2716         if (p_ch->claw_state == CLAW_STOP)
2717                 return;
2718         if (p_first_ccw == NULL) {
2719                 return;
2720         }
2721         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2722                 parm = (unsigned long) p_ch;
2723                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2724                 rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2725                                       0xff, 0);
2726                 if (rc != 0) {
2727                         ccw_check_return_code(p_ch->cdev, rc);
2728                 }
2729         }
2730         dev->trans_start = jiffies;
2731         return;
2732 }       /*    end of claw_strt_out_IO    */
2733
2734 /*-------------------------------------------------------------------*
2735 *       Free write buffers                                           *
2736 *                                                                    *
2737 *--------------------------------------------------------------------*/
2738
2739 static void
2740 claw_free_wrt_buf( struct net_device *dev )
2741 {
2742
2743         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2744         struct ccwbk*p_this_ccw;
2745         struct ccwbk*p_next_ccw;
2746
2747         CLAW_DBF_TEXT(4, trace, "freewrtb");
2748         /*  scan the write queue to free any completed write packets   */
2749         p_this_ccw=privptr->p_write_active_first;
2750         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2751         {
2752                 p_next_ccw = p_this_ccw->next;
2753                 if (((p_next_ccw!=NULL) &&
2754                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2755                     ((p_this_ccw == privptr->p_write_active_last) &&
2756                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2757                         /* The next CCW is OK or this is  */
2758                         /* the last CCW...free it   @A1A  */
2759                         privptr->p_write_active_first=p_this_ccw->next;
2760                         p_this_ccw->header.flag=CLAW_PENDING;
2761                         p_this_ccw->next=privptr->p_write_free_chain;
2762                         privptr->p_write_free_chain=p_this_ccw;
2763                         ++privptr->write_free_count;
2764                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2765                         p_this_ccw=privptr->p_write_active_first;
2766                         privptr->stats.tx_packets++;
2767                 }
2768                 else {
2769                         break;
2770                 }
2771         }
2772         if (privptr->write_free_count!=0) {
2773                 claw_clearbit_busy(TB_NOBUFFER,dev);
2774         }
2775         /*   whole chain removed?   */
2776         if (privptr->p_write_active_first==NULL) {
2777                 privptr->p_write_active_last=NULL;
2778         }
2779         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2780         return;
2781 }
2782
2783 /*-------------------------------------------------------------------*
2784 *       claw free netdevice                                          *
2785 *                                                                    *
2786 *--------------------------------------------------------------------*/
2787 static void
2788 claw_free_netdevice(struct net_device * dev, int free_dev)
2789 {
2790         struct claw_privbk *privptr;
2791
2792         CLAW_DBF_TEXT(2, setup, "free_dev");
2793         if (!dev)
2794                 return;
2795         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2796         privptr = dev->ml_priv;
2797         if (dev->flags & IFF_RUNNING)
2798                 claw_release(dev);
2799         if (privptr) {
2800                 privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2801         }
2802         dev->ml_priv = NULL;
2803 #ifdef MODULE
2804         if (free_dev) {
2805                 free_netdev(dev);
2806         }
2807 #endif
2808         CLAW_DBF_TEXT(2, setup, "free_ok");
2809 }
2810
2811 /**
2812  * Claw init netdevice
2813  * Initialize everything of the net device except the name and the
2814  * channel structs.
2815  */
2816 static const struct net_device_ops claw_netdev_ops = {
2817         .ndo_open               = claw_open,
2818         .ndo_stop               = claw_release,
2819         .ndo_get_stats          = claw_stats,
2820         .ndo_start_xmit         = claw_tx,
2821         .ndo_change_mtu         = claw_change_mtu,
2822 };
2823
2824 static void
2825 claw_init_netdevice(struct net_device * dev)
2826 {
2827         CLAW_DBF_TEXT(2, setup, "init_dev");
2828         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2829         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2830         dev->hard_header_len = 0;
2831         dev->addr_len = 0;
2832         dev->type = ARPHRD_SLIP;
2833         dev->tx_queue_len = 1300;
2834         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2835         dev->netdev_ops = &claw_netdev_ops;
2836         CLAW_DBF_TEXT(2, setup, "initok");
2837         return;
2838 }
2839
2840 /**
2841  * Init a new channel in the privptr->channel[i].
2842  *
2843  * @param cdev  The ccw_device to be added.
2844  *
2845  * @return 0 on success, !0 on error.
2846  */
2847 static int
2848 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2849 {
2850         struct chbk *p_ch;
2851         struct ccw_dev_id dev_id;
2852
2853         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2854         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2855         p_ch = &privptr->channel[i];
2856         p_ch->cdev = cdev;
2857         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2858         ccw_device_get_id(cdev, &dev_id);
2859         p_ch->devno = dev_id.devno;
2860         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2861                 return -ENOMEM;
2862         }
2863         return 0;
2864 }
2865
2866
2867 /**
2868  *
2869  * Setup an interface.
2870  *
2871  * @param cgdev  Device to be setup.
2872  *
2873  * @returns 0 on success, !0 on failure.
2874  */
2875 static int
2876 claw_new_device(struct ccwgroup_device *cgdev)
2877 {
2878         struct claw_privbk *privptr;
2879         struct claw_env *p_env;
2880         struct net_device *dev;
2881         int ret;
2882         struct ccw_dev_id dev_id;
2883
2884         dev_info(&cgdev->dev, "add for %s\n",
2885                  dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2886         CLAW_DBF_TEXT(2, setup, "new_dev");
2887         privptr = dev_get_drvdata(&cgdev->dev);
2888         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2889         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2890         if (!privptr)
2891                 return -ENODEV;
2892         p_env = privptr->p_env;
2893         ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2894         p_env->devno[READ_CHANNEL] = dev_id.devno;
2895         ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2896         p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2897         ret = add_channel(cgdev->cdev[0],0,privptr);
2898         if (ret == 0)
2899                 ret = add_channel(cgdev->cdev[1],1,privptr);
2900         if (ret != 0) {
2901                 dev_warn(&cgdev->dev, "Creating a CLAW group device"
2902                         " failed with error code %d\n", ret);
2903                 goto out;
2904         }
2905         ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2906         if (ret != 0) {
2907                 dev_warn(&cgdev->dev,
2908                         "Setting the read subchannel online"
2909                         " failed with error code %d\n", ret);
2910                 goto out;
2911         }
2912         ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2913         if (ret != 0) {
2914                 dev_warn(&cgdev->dev,
2915                         "Setting the write subchannel online "
2916                         "failed with error code %d\n", ret);
2917                 goto out;
2918         }
2919         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2920         if (!dev) {
2921                 dev_warn(&cgdev->dev,
2922                         "Activating the CLAW device failed\n");
2923                 goto out;
2924         }
2925         dev->ml_priv = privptr;
2926         dev_set_drvdata(&cgdev->dev, privptr);
2927         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2928         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2929         /* sysfs magic */
2930         SET_NETDEV_DEV(dev, &cgdev->dev);
2931         if (register_netdev(dev) != 0) {
2932                 claw_free_netdevice(dev, 1);
2933                 CLAW_DBF_TEXT(2, trace, "regfail");
2934                 goto out;
2935         }
2936         dev->flags &=~IFF_RUNNING;
2937         if (privptr->buffs_alloc == 0) {
2938                 ret=init_ccw_bk(dev);
2939                 if (ret !=0) {
2940                         unregister_netdev(dev);
2941                         claw_free_netdevice(dev,1);
2942                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2943                         goto out;
2944                 }
2945         }
2946         privptr->channel[READ_CHANNEL].ndev = dev;
2947         privptr->channel[WRITE_CHANNEL].ndev = dev;
2948         privptr->p_env->ndev = dev;
2949
2950         dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2951                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2952                 dev->name, p_env->read_size,
2953                 p_env->write_size, p_env->read_buffers,
2954                 p_env->write_buffers, p_env->devno[READ_CHANNEL],
2955                 p_env->devno[WRITE_CHANNEL]);
2956         dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2957                 ":%.8s api_type: %.8s\n",
2958                 dev->name, p_env->host_name,
2959                 p_env->adapter_name , p_env->api_type);
2960         return 0;
2961 out:
2962         ccw_device_set_offline(cgdev->cdev[1]);
2963         ccw_device_set_offline(cgdev->cdev[0]);
2964         return -ENODEV;
2965 }
2966
2967 static void
2968 claw_purge_skb_queue(struct sk_buff_head *q)
2969 {
2970         struct sk_buff *skb;
2971
2972         CLAW_DBF_TEXT(4, trace, "purgque");
2973         while ((skb = skb_dequeue(q))) {
2974                 atomic_dec(&skb->users);
2975                 dev_kfree_skb_any(skb);
2976         }
2977 }
2978
2979 /**
2980  * Shutdown an interface.
2981  *
2982  * @param cgdev  Device to be shut down.
2983  *
2984  * @returns 0 on success, !0 on failure.
2985  */
2986 static int
2987 claw_shutdown_device(struct ccwgroup_device *cgdev)
2988 {
2989         struct claw_privbk *priv;
2990         struct net_device *ndev;
2991         int ret = 0;
2992
2993         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2994         priv = dev_get_drvdata(&cgdev->dev);
2995         if (!priv)
2996                 return -ENODEV;
2997         ndev = priv->channel[READ_CHANNEL].ndev;
2998         if (ndev) {
2999                 /* Close the device */
3000                 dev_info(&cgdev->dev, "%s: shutting down\n",
3001                         ndev->name);
3002                 if (ndev->flags & IFF_RUNNING)
3003                         ret = claw_release(ndev);
3004                 ndev->flags &=~IFF_RUNNING;
3005                 unregister_netdev(ndev);
3006                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3007                 claw_free_netdevice(ndev, 1);
3008                 priv->channel[READ_CHANNEL].ndev = NULL;
3009                 priv->channel[WRITE_CHANNEL].ndev = NULL;
3010                 priv->p_env->ndev = NULL;
3011         }
3012         ccw_device_set_offline(cgdev->cdev[1]);
3013         ccw_device_set_offline(cgdev->cdev[0]);
3014         return ret;
3015 }
3016
3017 static void
3018 claw_remove_device(struct ccwgroup_device *cgdev)
3019 {
3020         struct claw_privbk *priv;
3021
3022         BUG_ON(!cgdev);
3023         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3024         priv = dev_get_drvdata(&cgdev->dev);
3025         BUG_ON(!priv);
3026         dev_info(&cgdev->dev, " will be removed.\n");
3027         if (cgdev->state == CCWGROUP_ONLINE)
3028                 claw_shutdown_device(cgdev);
3029         kfree(priv->p_mtc_envelope);
3030         priv->p_mtc_envelope=NULL;
3031         kfree(priv->p_env);
3032         priv->p_env=NULL;
3033         kfree(priv->channel[0].irb);
3034         priv->channel[0].irb=NULL;
3035         kfree(priv->channel[1].irb);
3036         priv->channel[1].irb=NULL;
3037         kfree(priv);
3038         dev_set_drvdata(&cgdev->dev, NULL);
3039         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3040         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3041         put_device(&cgdev->dev);
3042
3043         return;
3044 }
3045
3046
3047 /*
3048  * sysfs attributes
3049  */
3050 static ssize_t
3051 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3052 {
3053         struct claw_privbk *priv;
3054         struct claw_env *  p_env;
3055
3056         priv = dev_get_drvdata(dev);
3057         if (!priv)
3058                 return -ENODEV;
3059         p_env = priv->p_env;
3060         return sprintf(buf, "%s\n",p_env->host_name);
3061 }
3062
3063 static ssize_t
3064 claw_hname_write(struct device *dev, struct device_attribute *attr,
3065          const char *buf, size_t count)
3066 {
3067         struct claw_privbk *priv;
3068         struct claw_env *  p_env;
3069
3070         priv = dev_get_drvdata(dev);
3071         if (!priv)
3072                 return -ENODEV;
3073         p_env = priv->p_env;
3074         if (count > MAX_NAME_LEN+1)
3075                 return -EINVAL;
3076         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3077         strncpy(p_env->host_name,buf, count);
3078         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3079         p_env->host_name[MAX_NAME_LEN] = 0x00;
3080         CLAW_DBF_TEXT(2, setup, "HstnSet");
3081         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3082
3083         return count;
3084 }
3085
3086 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3087
3088 static ssize_t
3089 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3090 {
3091         struct claw_privbk *priv;
3092         struct claw_env *  p_env;
3093
3094         priv = dev_get_drvdata(dev);
3095         if (!priv)
3096                 return -ENODEV;
3097         p_env = priv->p_env;
3098         return sprintf(buf, "%s\n", p_env->adapter_name);
3099 }
3100
3101 static ssize_t
3102 claw_adname_write(struct device *dev, struct device_attribute *attr,
3103          const char *buf, size_t count)
3104 {
3105         struct claw_privbk *priv;
3106         struct claw_env *  p_env;
3107
3108         priv = dev_get_drvdata(dev);
3109         if (!priv)
3110                 return -ENODEV;
3111         p_env = priv->p_env;
3112         if (count > MAX_NAME_LEN+1)
3113                 return -EINVAL;
3114         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3115         strncpy(p_env->adapter_name,buf, count);
3116         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3117         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3118         CLAW_DBF_TEXT(2, setup, "AdnSet");
3119         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3120
3121         return count;
3122 }
3123
3124 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3125
3126 static ssize_t
3127 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3128 {
3129         struct claw_privbk *priv;
3130         struct claw_env *  p_env;
3131
3132         priv = dev_get_drvdata(dev);
3133         if (!priv)
3134                 return -ENODEV;
3135         p_env = priv->p_env;
3136         return sprintf(buf, "%s\n",
3137                        p_env->api_type);
3138 }
3139
3140 static ssize_t
3141 claw_apname_write(struct device *dev, struct device_attribute *attr,
3142         const char *buf, size_t count)
3143 {
3144         struct claw_privbk *priv;
3145         struct claw_env *  p_env;
3146
3147         priv = dev_get_drvdata(dev);
3148         if (!priv)
3149                 return -ENODEV;
3150         p_env = priv->p_env;
3151         if (count > MAX_NAME_LEN+1)
3152                 return -EINVAL;
3153         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3154         strncpy(p_env->api_type,buf, count);
3155         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3156         p_env->api_type[MAX_NAME_LEN] = 0x00;
3157         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3158                 p_env->read_size=DEF_PACK_BUFSIZE;
3159                 p_env->write_size=DEF_PACK_BUFSIZE;
3160                 p_env->packing=PACKING_ASK;
3161                 CLAW_DBF_TEXT(2, setup, "PACKING");
3162         }
3163         else {
3164                 p_env->packing=0;
3165                 p_env->read_size=CLAW_FRAME_SIZE;
3166                 p_env->write_size=CLAW_FRAME_SIZE;
3167                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3168         }
3169         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3170         return count;
3171 }
3172
3173 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3174
3175 static ssize_t
3176 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3177 {
3178         struct claw_privbk *priv;
3179         struct claw_env * p_env;
3180
3181         priv = dev_get_drvdata(dev);
3182         if (!priv)
3183                 return -ENODEV;
3184         p_env = priv->p_env;
3185         return sprintf(buf, "%d\n", p_env->write_buffers);
3186 }
3187
3188 static ssize_t
3189 claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3190         const char *buf, size_t count)
3191 {
3192         struct claw_privbk *priv;
3193         struct claw_env *  p_env;
3194         int nnn,max;
3195
3196         priv = dev_get_drvdata(dev);
3197         if (!priv)
3198                 return -ENODEV;
3199         p_env = priv->p_env;
3200         sscanf(buf, "%i", &nnn);
3201         if (p_env->packing) {
3202                 max = 64;
3203         }
3204         else {
3205                 max = 512;
3206         }
3207         if ((nnn > max ) || (nnn < 2))
3208                 return -EINVAL;
3209         p_env->write_buffers = nnn;
3210         CLAW_DBF_TEXT(2, setup, "Wbufset");
3211         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3212         return count;
3213 }
3214
3215 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3216
3217 static ssize_t
3218 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3219 {
3220         struct claw_privbk *priv;
3221         struct claw_env *  p_env;
3222
3223         priv = dev_get_drvdata(dev);
3224         if (!priv)
3225                 return -ENODEV;
3226         p_env = priv->p_env;
3227         return sprintf(buf, "%d\n", p_env->read_buffers);
3228 }
3229
3230 static ssize_t
3231 claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3232         const char *buf, size_t count)
3233 {
3234         struct claw_privbk *priv;
3235         struct claw_env *p_env;
3236         int nnn,max;
3237
3238         priv = dev_get_drvdata(dev);
3239         if (!priv)
3240                 return -ENODEV;
3241         p_env = priv->p_env;
3242         sscanf(buf, "%i", &nnn);
3243         if (p_env->packing) {
3244                 max = 64;
3245         }
3246         else {
3247                 max = 512;
3248         }
3249         if ((nnn > max ) || (nnn < 2))
3250                 return -EINVAL;
3251         p_env->read_buffers = nnn;
3252         CLAW_DBF_TEXT(2, setup, "Rbufset");
3253         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3254         return count;
3255 }
3256 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3257
3258 static struct attribute *claw_attr[] = {
3259         &dev_attr_read_buffer.attr,
3260         &dev_attr_write_buffer.attr,
3261         &dev_attr_adapter_name.attr,
3262         &dev_attr_api_type.attr,
3263         &dev_attr_host_name.attr,
3264         NULL,
3265 };
3266 static struct attribute_group claw_attr_group = {
3267         .attrs = claw_attr,
3268 };
3269 static const struct attribute_group *claw_attr_groups[] = {
3270         &claw_attr_group,
3271         NULL,
3272 };
3273 static const struct device_type claw_devtype = {
3274         .name = "claw",
3275         .groups = claw_attr_groups,
3276 };
3277
3278 /*----------------------------------------------------------------*
3279  *   claw_probe                                                   *
3280  *      this function is called for each CLAW device.             *
3281  *----------------------------------------------------------------*/
3282 static int claw_probe(struct ccwgroup_device *cgdev)
3283 {
3284         struct claw_privbk *privptr = NULL;
3285
3286         CLAW_DBF_TEXT(2, setup, "probe");
3287         if (!get_device(&cgdev->dev))
3288                 return -ENODEV;
3289         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
3290         dev_set_drvdata(&cgdev->dev, privptr);
3291         if (privptr == NULL) {
3292                 probe_error(cgdev);
3293                 put_device(&cgdev->dev);
3294                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3295                 return -ENOMEM;
3296         }
3297         privptr->p_mtc_envelope = kzalloc(MAX_ENVELOPE_SIZE, GFP_KERNEL);
3298         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
3299         if ((privptr->p_mtc_envelope == NULL) || (privptr->p_env == NULL)) {
3300                 probe_error(cgdev);
3301                 put_device(&cgdev->dev);
3302                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3303                 return -ENOMEM;
3304         }
3305         memcpy(privptr->p_env->adapter_name, WS_NAME_NOT_DEF, 8);
3306         memcpy(privptr->p_env->host_name, WS_NAME_NOT_DEF, 8);
3307         memcpy(privptr->p_env->api_type, WS_NAME_NOT_DEF, 8);
3308         privptr->p_env->packing = 0;
3309         privptr->p_env->write_buffers = 5;
3310         privptr->p_env->read_buffers = 5;
3311         privptr->p_env->read_size = CLAW_FRAME_SIZE;
3312         privptr->p_env->write_size = CLAW_FRAME_SIZE;
3313         privptr->p_env->p_priv = privptr;
3314         cgdev->cdev[0]->handler = claw_irq_handler;
3315         cgdev->cdev[1]->handler = claw_irq_handler;
3316         cgdev->dev.type = &claw_devtype;
3317         CLAW_DBF_TEXT(2, setup, "prbext 0");
3318
3319         return 0;
3320 }  /*  end of claw_probe       */
3321
3322 /*--------------------------------------------------------------------*
3323 *    claw_init  and cleanup                                           *
3324 *---------------------------------------------------------------------*/
3325
3326 static void __exit claw_cleanup(void)
3327 {
3328         ccwgroup_driver_unregister(&claw_group_driver);
3329         ccw_driver_unregister(&claw_ccw_driver);
3330         root_device_unregister(claw_root_dev);
3331         claw_unregister_debug_facility();
3332         pr_info("Driver unloaded\n");
3333 }
3334
3335 /**
3336  * Initialize module.
3337  * This is called just after the module is loaded.
3338  *
3339  * @return 0 on success, !0 on error.
3340  */
3341 static int __init claw_init(void)
3342 {
3343         int ret = 0;
3344
3345         pr_info("Loading %s\n", version);
3346         ret = claw_register_debug_facility();
3347         if (ret) {
3348                 pr_err("Registering with the S/390 debug feature"
3349                         " failed with error code %d\n", ret);
3350                 goto out_err;
3351         }
3352         CLAW_DBF_TEXT(2, setup, "init_mod");
3353         claw_root_dev = root_device_register("claw");
3354         ret = IS_ERR(claw_root_dev) ? PTR_ERR(claw_root_dev) : 0;
3355         if (ret)
3356                 goto register_err;
3357         ret = ccw_driver_register(&claw_ccw_driver);
3358         if (ret)
3359                 goto ccw_err;
3360         claw_group_driver.driver.groups = claw_drv_attr_groups;
3361         ret = ccwgroup_driver_register(&claw_group_driver);
3362         if (ret)
3363                 goto ccwgroup_err;
3364         return 0;
3365
3366 ccwgroup_err:
3367         ccw_driver_unregister(&claw_ccw_driver);
3368 ccw_err:
3369         root_device_unregister(claw_root_dev);
3370 register_err:
3371         CLAW_DBF_TEXT(2, setup, "init_bad");
3372         claw_unregister_debug_facility();
3373 out_err:
3374         pr_err("Initializing the claw device driver failed\n");
3375         return ret;
3376 }
3377
3378 module_init(claw_init);
3379 module_exit(claw_cleanup);
3380
3381 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3382 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3383                         "Copyright 2000,2008 IBM Corporation\n");
3384 MODULE_LICENSE("GPL");