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  eieio();
 140 }
 141
 142 static inline void
 143 claw_clear_busy(struct net_device *dev)
 144 {
 145         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
 146         netif_wake_queue(dev);
 147         eieio();
 148 }
 149
 150 static inline int
 151 claw_check_busy(struct net_device *dev)
 152 {
 153         eieio();
 154         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
 155 }
 156
 157 static inline void
 158 claw_setbit_busy(int nr,struct net_device *dev)
 159 {
 160         netif_stop_queue(dev);
 161         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 162 }
 163
 164 static inline void
 165 claw_clearbit_busy(int nr,struct net_device *dev)
 166 {
 167         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 168         netif_wake_queue(dev);
 169 }
 170
 171 static inline int
 172 claw_test_and_setbit_busy(int nr,struct net_device *dev)
 173 {
 174         netif_stop_queue(dev);
 175         return test_and_set_bit(nr,
 176                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
 177 }
 178
 179
 180 /* Functions for the DEV methods */
 181
 182 static int claw_probe(struct ccwgroup_device *cgdev);
 183 static void claw_remove_device(struct ccwgroup_device *cgdev);
 184 static void claw_purge_skb_queue(struct sk_buff_head *q);
 185 static int claw_new_device(struct ccwgroup_device *cgdev);
 186 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
 187 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
 188 static int claw_change_mtu( struct net_device *dev, int new_mtu);
 189 static int claw_open(struct net_device *dev);
 190 static void claw_irq_handler(struct ccw_device *cdev,
 191         unsigned long intparm, struct irb *irb);
 192 static void claw_irq_tasklet ( unsigned long data );
 193 static int claw_release(struct net_device *dev);
 194 static void claw_write_retry ( struct chbk * p_ch );
 195 static void claw_write_next ( struct chbk * p_ch );
 196 static void claw_timer ( struct chbk * p_ch );
 197
 198 /* Functions */
 199 static int add_claw_reads(struct net_device *dev,
 200         struct ccwbk* p_first, struct ccwbk* p_last);
 201 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
 202 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
 203 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
 204 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
 205 static int init_ccw_bk(struct net_device *dev);
 206 static void probe_error( struct ccwgroup_device *cgdev);
 207 static struct net_device_stats *claw_stats(struct net_device *dev);
 208 static int pages_to_order_of_mag(int num_of_pages);
 209 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
 210 /* sysfs Functions */
 211 static ssize_t claw_hname_show(struct device *dev,
 212         struct device_attribute *attr, char *buf);
 213 static ssize_t claw_hname_write(struct device *dev,
 214         struct device_attribute *attr,
 215         const char *buf, size_t count);
 216 static ssize_t claw_adname_show(struct device *dev,
 217         struct device_attribute *attr, char *buf);
 218 static ssize_t claw_adname_write(struct device *dev,
 219         struct device_attribute *attr,
 220         const char *buf, size_t count);
 221 static ssize_t claw_apname_show(struct device *dev,
 222         struct device_attribute *attr, char *buf);
 223 static ssize_t claw_apname_write(struct device *dev,
 224         struct device_attribute *attr,
 225         const char *buf, size_t count);
 226 static ssize_t claw_wbuff_show(struct device *dev,
 227         struct device_attribute *attr, char *buf);
 228 static ssize_t claw_wbuff_write(struct device *dev,
 229         struct device_attribute *attr,
 230         const char *buf, size_t count);
 231 static ssize_t claw_rbuff_show(struct device *dev,
 232         struct device_attribute *attr, char *buf);
 233 static ssize_t claw_rbuff_write(struct device *dev,
 234         struct device_attribute *attr,
 235         const char *buf, size_t count);
 236 static int claw_add_files(struct device *dev);
 237 static void claw_remove_files(struct device *dev);
 238
 239 /*   Functions for System Validate  */
 240 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
 241 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
 242        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
 243 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
 244 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
 245 static int claw_snd_sys_validate_rsp(struct net_device *dev,
 246         struct clawctl * p_ctl, __u32 return_code);
 247 static int claw_strt_conn_req(struct net_device *dev );
 248 static void claw_strt_read(struct net_device *dev, int lock);
 249 static void claw_strt_out_IO(struct net_device *dev);
 250 static void claw_free_wrt_buf(struct net_device *dev);
 251
 252 /* Functions for unpack reads   */
 253 static void unpack_read(struct net_device *dev);
 254
 255 static int claw_pm_prepare(struct ccwgroup_device *gdev)
 256 {
 257         return -EPERM;
 258 }
 259
 260 /* the root device for claw group devices */
 261 static struct device *claw_root_dev;
 262
 263 /* ccwgroup table  */
 264
 265 static struct ccwgroup_driver claw_group_driver = {
 266         .driver = {
 267                 .owner  = THIS_MODULE,
 268                 .name   = "claw",
 269         },
 270         .max_slaves  = 2,
 271         .driver_id   = 0xC3D3C1E6,
 272         .probe       = claw_probe,
 273         .remove      = claw_remove_device,
 274         .set_online  = claw_new_device,
 275         .set_offline = claw_shutdown_device,
 276         .prepare     = claw_pm_prepare,
 277 };
 278
 279 static struct ccw_device_id claw_ids[] = {
 280         {CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
 281         {},
 282 };
 283 MODULE_DEVICE_TABLE(ccw, claw_ids);
 284
 285 static struct ccw_driver claw_ccw_driver = {
 286         .driver = {
 287                 .owner  = THIS_MODULE,
 288                 .name   = "claw",
 289         },
 290         .ids    = claw_ids,
 291         .probe  = ccwgroup_probe_ccwdev,
 292         .remove = ccwgroup_remove_ccwdev,
 293         .int_class = IOINT_CLW,
 294 };
 295
 296 static ssize_t
 297 claw_driver_group_store(struct device_driver *ddrv, const char *buf,
 298                         size_t count)
 299 {
 300         int err;
 301         err = ccwgroup_create_from_string(claw_root_dev,
 302                                           claw_group_driver.driver_id,
 303                                           &claw_ccw_driver, 2, buf);
 304         return err ? err : count;
 305 }
 306
 307 static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);
 308
 309 static struct attribute *claw_group_attrs[] = {
 310         &driver_attr_group.attr,
 311         NULL,
 312 };
 313
 314 static struct attribute_group claw_group_attr_group = {
 315         .attrs = claw_group_attrs,
 316 };
 317
 318 static const struct attribute_group *claw_group_attr_groups[] = {
 319         &claw_group_attr_group,
 320         NULL,
 321 };
 322
 323 /*
 324 *       Key functions
 325 */
 326
 327 /*----------------------------------------------------------------*
 328  *   claw_probe                                                   *
 329  *      this function is called for each CLAW device.             *
 330  *----------------------------------------------------------------*/
 331 static int
 332 claw_probe(struct ccwgroup_device *cgdev)
 333 {
 334         int             rc;
 335         struct claw_privbk *privptr=NULL;
 336
 337         CLAW_DBF_TEXT(2, setup, "probe");
 338         if (!get_device(&cgdev->dev))
 339                 return -ENODEV;
 340         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
 341         dev_set_drvdata(&cgdev->dev, privptr);
 342         if (privptr == NULL) {
 343                 probe_error(cgdev);
 344                 put_device(&cgdev->dev);
 345                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 346                 return -ENOMEM;
 347         }
 348         privptr->p_mtc_envelope= kzalloc( MAX_ENVELOPE_SIZE, GFP_KERNEL);
 349         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
 350         if ((privptr->p_mtc_envelope==NULL) || (privptr->p_env==NULL)) {
 351                 probe_error(cgdev);
 352                 put_device(&cgdev->dev);
 353                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 354                 return -ENOMEM;
 355         }
 356         memcpy(privptr->p_env->adapter_name,WS_NAME_NOT_DEF,8);
 357         memcpy(privptr->p_env->host_name,WS_NAME_NOT_DEF,8);
 358         memcpy(privptr->p_env->api_type,WS_NAME_NOT_DEF,8);
 359         privptr->p_env->packing = 0;
 360         privptr->p_env->write_buffers = 5;
 361         privptr->p_env->read_buffers = 5;
 362         privptr->p_env->read_size = CLAW_FRAME_SIZE;
 363         privptr->p_env->write_size = CLAW_FRAME_SIZE;
 364         rc = claw_add_files(&cgdev->dev);
 365         if (rc) {
 366                 probe_error(cgdev);
 367                 put_device(&cgdev->dev);
 368                 dev_err(&cgdev->dev, "Creating the /proc files for a new"
 369                 " CLAW device failed\n");
 370                 CLAW_DBF_TEXT_(2, setup, "probex%d", rc);
 371                 return rc;
 372         }
 373         privptr->p_env->p_priv = privptr;
 374         cgdev->cdev[0]->handler = claw_irq_handler;
 375         cgdev->cdev[1]->handler = claw_irq_handler;
 376         CLAW_DBF_TEXT(2, setup, "prbext 0");
 377
 378         return 0;
 379 }  /*  end of claw_probe       */
 380
 381 /*-------------------------------------------------------------------*
 382  *   claw_tx                                                         *
 383  *-------------------------------------------------------------------*/
 384
 385 static int
 386 claw_tx(struct sk_buff *skb, struct net_device *dev)
 387 {
 388         int             rc;
 389         struct claw_privbk *privptr = dev->ml_priv;
 390         unsigned long saveflags;
 391         struct chbk *p_ch;
 392
 393         CLAW_DBF_TEXT(4, trace, "claw_tx");
 394         p_ch = &privptr->channel[WRITE_CHANNEL];
 395         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
 396         rc=claw_hw_tx( skb, dev, 1 );
 397         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
 398         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
 399         if (rc)
 400                 rc = NETDEV_TX_BUSY;
 401         else
 402                 rc = NETDEV_TX_OK;
 403         return rc;
 404 }   /*  end of claw_tx */
 405
 406 /*------------------------------------------------------------------*
 407  *  pack the collect queue into an skb and return it                *
 408  *   If not packing just return the top skb from the queue          *
 409  *------------------------------------------------------------------*/
 410
 411 static struct sk_buff *
 412 claw_pack_skb(struct claw_privbk *privptr)
 413 {
 414         struct sk_buff *new_skb,*held_skb;
 415         struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
 416         struct claw_env  *p_env = privptr->p_env;
 417         int     pkt_cnt,pk_ind,so_far;
 418
 419         new_skb = NULL;         /* assume no dice */
 420         pkt_cnt = 0;
 421         CLAW_DBF_TEXT(4, trace, "PackSKBe");
 422         if (!skb_queue_empty(&p_ch->collect_queue)) {
 423         /* some data */
 424                 held_skb = skb_dequeue(&p_ch->collect_queue);
 425                 if (held_skb)
 426                         dev_kfree_skb_any(held_skb);
 427                 else
 428                         return NULL;
 429                 if (p_env->packing != DO_PACKED)
 430                         return held_skb;
 431                 /* get a new SKB we will pack at least one */
 432                 new_skb = dev_alloc_skb(p_env->write_size);
 433                 if (new_skb == NULL) {
 434                         atomic_inc(&held_skb->users);
 435                         skb_queue_head(&p_ch->collect_queue,held_skb);
 436                         return NULL;
 437                 }
 438                 /* we have packed packet and a place to put it  */
 439                 pk_ind = 1;
 440                 so_far = 0;
 441                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 442                 while ((pk_ind) && (held_skb != NULL)) {
 443                         if (held_skb->len+so_far <= p_env->write_size-8) {
 444                                 memcpy(skb_put(new_skb,held_skb->len),
 445                                         held_skb->data,held_skb->len);
 446                                 privptr->stats.tx_packets++;
 447                                 so_far += held_skb->len;
 448                                 pkt_cnt++;
 449                                 dev_kfree_skb_any(held_skb);
 450                                 held_skb = skb_dequeue(&p_ch->collect_queue);
 451                                 if (held_skb)
 452                                         atomic_dec(&held_skb->users);
 453                         } else {
 454                                 pk_ind = 0;
 455                                 atomic_inc(&held_skb->users);
 456                                 skb_queue_head(&p_ch->collect_queue,held_skb);
 457                         }
 458                 }
 459         }
 460         CLAW_DBF_TEXT(4, trace, "PackSKBx");
 461         return new_skb;
 462 }
 463
 464 /*-------------------------------------------------------------------*
 465  *   claw_change_mtu                                                 *
 466  *                                                                   *
 467  *-------------------------------------------------------------------*/
 468
 469 static int
 470 claw_change_mtu(struct net_device *dev, int new_mtu)
 471 {
 472         struct claw_privbk *privptr = dev->ml_priv;
 473         int buff_size;
 474         CLAW_DBF_TEXT(4, trace, "setmtu");
 475         buff_size = privptr->p_env->write_size;
 476         if ((new_mtu < 60) || (new_mtu > buff_size)) {
 477                 return -EINVAL;
 478         }
 479         dev->mtu = new_mtu;
 480         return 0;
 481 }  /*   end of claw_change_mtu */
 482
 483
 484 /*-------------------------------------------------------------------*
 485  *   claw_open                                                       *
 486  *                                                                   *
 487  *-------------------------------------------------------------------*/
 488 static int
 489 claw_open(struct net_device *dev)
 490 {
 491
 492         int     rc;
 493         int     i;
 494         unsigned long       saveflags=0;
 495         unsigned long       parm;
 496         struct claw_privbk  *privptr;
 497         DECLARE_WAITQUEUE(wait, current);
 498         struct timer_list  timer;
 499         struct ccwbk *p_buf;
 500
 501         CLAW_DBF_TEXT(4, trace, "open");
 502         privptr = (struct claw_privbk *)dev->ml_priv;
 503         /*   allocate and initialize CCW blocks */
 504         if (privptr->buffs_alloc == 0) {
 505                 rc=init_ccw_bk(dev);
 506                 if (rc) {
 507                         CLAW_DBF_TEXT(2, trace, "openmem");
 508                         return -ENOMEM;
 509                 }
 510         }
 511         privptr->system_validate_comp=0;
 512         privptr->release_pend=0;
 513         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 514                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 515                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 516                 privptr->p_env->packing=PACKING_ASK;
 517         } else {
 518                 privptr->p_env->packing=0;
 519                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
 520                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
 521         }
 522         claw_set_busy(dev);
 523         tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
 524                 (unsigned long) &privptr->channel[READ_CHANNEL]);
 525         for ( i = 0; i < 2;  i++) {
 526                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 527                 init_waitqueue_head(&privptr->channel[i].wait);
 528                 /* skb_queue_head_init(&p_ch->io_queue); */
 529                 if (i == WRITE_CHANNEL)
 530                         skb_queue_head_init(
 531                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
 532                 privptr->channel[i].flag_a = 0;
 533                 privptr->channel[i].IO_active = 0;
 534                 privptr->channel[i].flag  &= ~CLAW_TIMER;
 535                 init_timer(&timer);
 536                 timer.function = (void *)claw_timer;
 537                 timer.data = (unsigned long)(&privptr->channel[i]);
 538                 timer.expires = jiffies + 15*HZ;
 539                 add_timer(&timer);
 540                 spin_lock_irqsave(get_ccwdev_lock(
 541                         privptr->channel[i].cdev), saveflags);
 542                 parm = (unsigned long) &privptr->channel[i];
 543                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 544                 rc = 0;
 545                 add_wait_queue(&privptr->channel[i].wait, &wait);
 546                 rc = ccw_device_halt(
 547                         (struct ccw_device *)privptr->channel[i].cdev,parm);
 548                 set_current_state(TASK_INTERRUPTIBLE);
 549                 spin_unlock_irqrestore(
 550                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 551                 schedule();
 552                 set_current_state(TASK_RUNNING);
 553                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 554                 if(rc != 0)
 555                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 556                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 557                         del_timer(&timer);
 558         }
 559         if ((((privptr->channel[READ_CHANNEL].last_dstat |
 560                 privptr->channel[WRITE_CHANNEL].last_dstat) &
 561            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 562            (((privptr->channel[READ_CHANNEL].flag |
 563                 privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
 564                 dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
 565                         "%s: remote side is not ready\n", dev->name);
 566                 CLAW_DBF_TEXT(2, trace, "notrdy");
 567
 568                 for ( i = 0; i < 2;  i++) {
 569                         spin_lock_irqsave(
 570                                 get_ccwdev_lock(privptr->channel[i].cdev),
 571                                 saveflags);
 572                         parm = (unsigned long) &privptr->channel[i];
 573                         privptr->channel[i].claw_state = CLAW_STOP;
 574                         rc = ccw_device_halt(
 575                                 (struct ccw_device *)&privptr->channel[i].cdev,
 576                                 parm);
 577                         spin_unlock_irqrestore(
 578                                 get_ccwdev_lock(privptr->channel[i].cdev),
 579                                 saveflags);
 580                         if (rc != 0) {
 581                                 ccw_check_return_code(
 582                                         privptr->channel[i].cdev, rc);
 583                         }
 584                 }
 585                 free_pages((unsigned long)privptr->p_buff_ccw,
 586                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 587                 if (privptr->p_env->read_size < PAGE_SIZE) {
 588                         free_pages((unsigned long)privptr->p_buff_read,
 589                                (int)pages_to_order_of_mag(
 590                                         privptr->p_buff_read_num));
 591                 }
 592                 else {
 593                         p_buf=privptr->p_read_active_first;
 594                         while (p_buf!=NULL) {
 595                                 free_pages((unsigned long)p_buf->p_buffer,
 596                                       (int)pages_to_order_of_mag(
 597                                         privptr->p_buff_pages_perread ));
 598                                 p_buf=p_buf->next;
 599                         }
 600                 }
 601                 if (privptr->p_env->write_size < PAGE_SIZE ) {
 602                         free_pages((unsigned long)privptr->p_buff_write,
 603                              (int)pages_to_order_of_mag(
 604                                 privptr->p_buff_write_num));
 605                 }
 606                 else {
 607                         p_buf=privptr->p_write_active_first;
 608                         while (p_buf!=NULL) {
 609                                 free_pages((unsigned long)p_buf->p_buffer,
 610                                      (int)pages_to_order_of_mag(
 611                                         privptr->p_buff_pages_perwrite ));
 612                                 p_buf=p_buf->next;
 613                         }
 614                 }
 615                 privptr->buffs_alloc = 0;
 616                 privptr->channel[READ_CHANNEL].flag = 0x00;
 617                 privptr->channel[WRITE_CHANNEL].flag = 0x00;
 618                 privptr->p_buff_ccw=NULL;
 619                 privptr->p_buff_read=NULL;
 620                 privptr->p_buff_write=NULL;
 621                 claw_clear_busy(dev);
 622                 CLAW_DBF_TEXT(2, trace, "open EIO");
 623                 return -EIO;
 624         }
 625
 626         /*   Send SystemValidate command */
 627
 628         claw_clear_busy(dev);
 629         CLAW_DBF_TEXT(4, trace, "openok");
 630         return 0;
 631 }    /*     end of claw_open    */
 632
 633 /*-------------------------------------------------------------------*
 634 *                                                                    *
 635 *       claw_irq_handler                                             *
 636 *                                                                    *
 637 *--------------------------------------------------------------------*/
 638 static void
 639 claw_irq_handler(struct ccw_device *cdev,
 640         unsigned long intparm, struct irb *irb)
 641 {
 642         struct chbk *p_ch = NULL;
 643         struct claw_privbk *privptr = NULL;
 644         struct net_device *dev = NULL;
 645         struct claw_env  *p_env;
 646         struct chbk *p_ch_r=NULL;
 647
 648         CLAW_DBF_TEXT(4, trace, "clawirq");
 649         /* Bypass all 'unsolicited interrupts' */
 650         privptr = dev_get_drvdata(&cdev->dev);
 651         if (!privptr) {
 652                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 653                         " IRQ, c-%02x d-%02x\n",
 654                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 655                 CLAW_DBF_TEXT(2, trace, "badirq");
 656                 return;
 657         }
 658
 659         /* Try to extract channel from driver data. */
 660         if (privptr->channel[READ_CHANNEL].cdev == cdev)
 661                 p_ch = &privptr->channel[READ_CHANNEL];
 662         else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
 663                 p_ch = &privptr->channel[WRITE_CHANNEL];
 664         else {
 665                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 666                 CLAW_DBF_TEXT(2, trace, "badchan");
 667                 return;
 668         }
 669         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 670
 671         dev = (struct net_device *) (p_ch->ndev);
 672         p_env=privptr->p_env;
 673
 674         /* Copy interruption response block. */
 675         memcpy(p_ch->irb, irb, sizeof(struct irb));
 676
 677         /* Check for good subchannel return code, otherwise info message */
 678         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 679                 dev_info(&cdev->dev,
 680                         "%s: subchannel check for device: %04x -"
 681                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 682                         dev->name, p_ch->devno,
 683                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 684                         irb->scsw.cmd.cpa);
 685                 CLAW_DBF_TEXT(2, trace, "chanchk");
 686                 /* return; */
 687         }
 688
 689         /* Check the reason-code of a unit check */
 690         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 691                 ccw_check_unit_check(p_ch, irb->ecw[0]);
 692
 693         /* State machine to bring the connection up, down and to restart */
 694         p_ch->last_dstat = irb->scsw.cmd.dstat;
 695
 696         switch (p_ch->claw_state) {
 697         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 698                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 699                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 700                 (p_ch->irb->scsw.cmd.stctl ==
 701                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 702                         return;
 703                 wake_up(&p_ch->wait);   /* wake up claw_release */
 704                 CLAW_DBF_TEXT(4, trace, "stop");
 705                 return;
 706         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 707                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 708                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 709                 (p_ch->irb->scsw.cmd.stctl ==
 710                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 711                         CLAW_DBF_TEXT(4, trace, "haltio");
 712                         return;
 713                 }
 714                 if (p_ch->flag == CLAW_READ) {
 715                         p_ch->claw_state = CLAW_START_READ;
 716                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 717                 } else if (p_ch->flag == CLAW_WRITE) {
 718                         p_ch->claw_state = CLAW_START_WRITE;
 719                         /*      send SYSTEM_VALIDATE                    */
 720                         claw_strt_read(dev, LOCK_NO);
 721                         claw_send_control(dev,
 722                                 SYSTEM_VALIDATE_REQUEST,
 723                                 0, 0, 0,
 724                                 p_env->host_name,
 725                                 p_env->adapter_name);
 726                 } else {
 727                         dev_warn(&cdev->dev, "The CLAW device received"
 728                                 " an unexpected IRQ, "
 729                                 "c-%02x d-%02x\n",
 730                                 irb->scsw.cmd.cstat,
 731                                 irb->scsw.cmd.dstat);
 732                         return;
 733                         }
 734                 CLAW_DBF_TEXT(4, trace, "haltio");
 735                 return;
 736         case CLAW_START_READ:
 737                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 738                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 739                         clear_bit(0, (void *)&p_ch->IO_active);
 740                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 741                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 742                             (p_ch->irb->ecw[0])        == 0) {
 743                                 privptr->stats.rx_errors++;
 744                                 dev_info(&cdev->dev,
 745                                         "%s: Restart is required after remote "
 746                                         "side recovers \n",
 747                                         dev->name);
 748                         }
 749                         CLAW_DBF_TEXT(4, trace, "notrdy");
 750                         return;
 751                 }
 752                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 753                         (p_ch->irb->scsw.cmd.dstat == 0)) {
 754                         if (test_and_set_bit(CLAW_BH_ACTIVE,
 755                                 (void *)&p_ch->flag_a) == 0)
 756                                 tasklet_schedule(&p_ch->tasklet);
 757                         else
 758                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
 759                         CLAW_DBF_TEXT(4, trace, "PCI_read");
 760                         return;
 761                 }
 762                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 763                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 764                  (p_ch->irb->scsw.cmd.stctl ==
 765                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 766                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
 767                         return;
 768                 }
 769                 clear_bit(0, (void *)&p_ch->IO_active);
 770                 claw_clearbit_busy(TB_RETRY, dev);
 771                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 772                         (void *)&p_ch->flag_a) == 0)
 773                         tasklet_schedule(&p_ch->tasklet);
 774                 else
 775                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
 776                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 777                 return;
 778         case CLAW_START_WRITE:
 779                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 780                         dev_info(&cdev->dev,
 781                                 "%s: Unit Check Occurred in "
 782                                 "write channel\n", dev->name);
 783                         clear_bit(0, (void *)&p_ch->IO_active);
 784                         if (p_ch->irb->ecw[0] & 0x80) {
 785                                 dev_info(&cdev->dev,
 786                                         "%s: Resetting Event "
 787                                         "occurred:\n", dev->name);
 788                                 init_timer(&p_ch->timer);
 789                                 p_ch->timer.function =
 790                                         (void *)claw_write_retry;
 791                                 p_ch->timer.data = (unsigned long)p_ch;
 792                                 p_ch->timer.expires = jiffies + 10*HZ;
 793                                 add_timer(&p_ch->timer);
 794                                 dev_info(&cdev->dev,
 795                                         "%s: write connection "
 796                                         "restarting\n", dev->name);
 797                         }
 798                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 799                         return;
 800                 }
 801                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 802                         clear_bit(0, (void *)&p_ch->IO_active);
 803                         dev_info(&cdev->dev,
 804                                 "%s: Unit Exception "
 805                                 "occurred in write channel\n",
 806                                 dev->name);
 807                 }
 808                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 809                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 810                 (p_ch->irb->scsw.cmd.stctl ==
 811                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 812                         CLAW_DBF_TEXT(4, trace, "writeUE");
 813                         return;
 814                 }
 815                 clear_bit(0, (void *)&p_ch->IO_active);
 816                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 817                         claw_write_next(p_ch);
 818                         claw_clearbit_busy(TB_TX, dev);
 819                         claw_clear_busy(dev);
 820                 }
 821                 p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
 822                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 823                         (void *)&p_ch_r->flag_a) == 0)
 824                         tasklet_schedule(&p_ch_r->tasklet);
 825                 CLAW_DBF_TEXT(4, trace, "StWtExit");
 826                 return;
 827         default:
 828                 dev_warn(&cdev->dev,
 829                         "The CLAW device for %s received an unexpected IRQ\n",
 830                          dev->name);
 831                 CLAW_DBF_TEXT(2, trace, "badIRQ");
 832                 return;
 833         }
 834
 835 }       /*   end of claw_irq_handler    */
 836
 837
 838 /*-------------------------------------------------------------------*
 839 *       claw_irq_tasklet                                             *
 840 *                                                                    *
 841 *--------------------------------------------------------------------*/
 842 static void
 843 claw_irq_tasklet ( unsigned long data )
 844 {
 845         struct chbk * p_ch;
 846         struct net_device  *dev;
 847
 848         p_ch = (struct chbk *) data;
 849         dev = (struct net_device *)p_ch->ndev;
 850         CLAW_DBF_TEXT(4, trace, "IRQtask");
 851         unpack_read(dev);
 852         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 853         CLAW_DBF_TEXT(4, trace, "TskletXt");
 854         return;
 855 }       /*    end of claw_irq_bh    */
 856
 857 /*-------------------------------------------------------------------*
 858 *       claw_release                                                 *
 859 *                                                                    *
 860 *--------------------------------------------------------------------*/
 861 static int
 862 claw_release(struct net_device *dev)
 863 {
 864         int                rc;
 865         int                i;
 866         unsigned long      saveflags;
 867         unsigned long      parm;
 868         struct claw_privbk *privptr;
 869         DECLARE_WAITQUEUE(wait, current);
 870         struct ccwbk*             p_this_ccw;
 871         struct ccwbk*             p_buf;
 872
 873         if (!dev)
 874                 return 0;
 875         privptr = (struct claw_privbk *)dev->ml_priv;
 876         if (!privptr)
 877                 return 0;
 878         CLAW_DBF_TEXT(4, trace, "release");
 879         privptr->release_pend=1;
 880         claw_setbit_busy(TB_STOP,dev);
 881         for ( i = 1; i >=0 ;  i--) {
 882                 spin_lock_irqsave(
 883                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 884              /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
 885                 privptr->channel[i].claw_state = CLAW_STOP;
 886                 privptr->channel[i].IO_active = 0;
 887                 parm = (unsigned long) &privptr->channel[i];
 888                 if (i == WRITE_CHANNEL)
 889                         claw_purge_skb_queue(
 890                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
 891                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 892                 if (privptr->system_validate_comp==0x00)  /* never opened? */
 893                    init_waitqueue_head(&privptr->channel[i].wait);
 894                 add_wait_queue(&privptr->channel[i].wait, &wait);
 895                 set_current_state(TASK_INTERRUPTIBLE);
 896                 spin_unlock_irqrestore(
 897                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 898                 schedule();
 899                 set_current_state(TASK_RUNNING);
 900                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 901                 if (rc != 0) {
 902                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 903                 }
 904         }
 905         if (privptr->pk_skb != NULL) {
 906                 dev_kfree_skb_any(privptr->pk_skb);
 907                 privptr->pk_skb = NULL;
 908         }
 909         if(privptr->buffs_alloc != 1) {
 910                 CLAW_DBF_TEXT(4, trace, "none2fre");
 911                 return 0;
 912         }
 913         CLAW_DBF_TEXT(4, trace, "freebufs");
 914         if (privptr->p_buff_ccw != NULL) {
 915                 free_pages((unsigned long)privptr->p_buff_ccw,
 916                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 917         }
 918         CLAW_DBF_TEXT(4, trace, "freeread");
 919         if (privptr->p_env->read_size < PAGE_SIZE) {
 920             if (privptr->p_buff_read != NULL) {
 921                 free_pages((unsigned long)privptr->p_buff_read,
 922                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 923                 }
 924         }
 925         else {
 926                 p_buf=privptr->p_read_active_first;
 927                 while (p_buf!=NULL) {
 928                         free_pages((unsigned long)p_buf->p_buffer,
 929                              (int)pages_to_order_of_mag(
 930                                 privptr->p_buff_pages_perread ));
 931                         p_buf=p_buf->next;
 932                 }
 933         }
 934          CLAW_DBF_TEXT(4, trace, "freewrit");
 935         if (privptr->p_env->write_size < PAGE_SIZE ) {
 936                 free_pages((unsigned long)privptr->p_buff_write,
 937                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 938         }
 939         else {
 940                 p_buf=privptr->p_write_active_first;
 941                 while (p_buf!=NULL) {
 942                         free_pages((unsigned long)p_buf->p_buffer,
 943                               (int)pages_to_order_of_mag(
 944                               privptr->p_buff_pages_perwrite ));
 945                         p_buf=p_buf->next;
 946                 }
 947         }
 948          CLAW_DBF_TEXT(4, trace, "clearptr");
 949         privptr->buffs_alloc = 0;
 950         privptr->p_buff_ccw=NULL;
 951         privptr->p_buff_read=NULL;
 952         privptr->p_buff_write=NULL;
 953         privptr->system_validate_comp=0;
 954         privptr->release_pend=0;
 955         /*      Remove any writes that were pending and reset all reads   */
 956         p_this_ccw=privptr->p_read_active_first;
 957         while (p_this_ccw!=NULL) {
 958                 p_this_ccw->header.length=0xffff;
 959                 p_this_ccw->header.opcode=0xff;
 960                 p_this_ccw->header.flag=0x00;
 961                 p_this_ccw=p_this_ccw->next;
 962         }
 963
 964         while (privptr->p_write_active_first!=NULL) {
 965                 p_this_ccw=privptr->p_write_active_first;
 966                 p_this_ccw->header.flag=CLAW_PENDING;
 967                 privptr->p_write_active_first=p_this_ccw->next;
 968                 p_this_ccw->next=privptr->p_write_free_chain;
 969                 privptr->p_write_free_chain=p_this_ccw;
 970                 ++privptr->write_free_count;
 971         }
 972         privptr->p_write_active_last=NULL;
 973         privptr->mtc_logical_link = -1;
 974         privptr->mtc_skipping = 1;
 975         privptr->mtc_offset=0;
 976
 977         if (((privptr->channel[READ_CHANNEL].last_dstat |
 978                 privptr->channel[WRITE_CHANNEL].last_dstat) &
 979                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 980                 dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
 981                         "Deactivating %s completed with incorrect"
 982                         " subchannel status "
 983                         "(read %02x, write %02x)\n",
 984                 dev->name,
 985                 privptr->channel[READ_CHANNEL].last_dstat,
 986                 privptr->channel[WRITE_CHANNEL].last_dstat);
 987                  CLAW_DBF_TEXT(2, trace, "badclose");
 988         }
 989         CLAW_DBF_TEXT(4, trace, "rlsexit");
 990         return 0;
 991 }      /* end of claw_release     */
 992
 993 /*-------------------------------------------------------------------*
 994 *       claw_write_retry                                             *
 995 *                                                                    *
 996 *--------------------------------------------------------------------*/
 997
 998 static void
 999 claw_write_retry ( struct chbk *p_ch )
1000 {
1001
1002         struct net_device  *dev=p_ch->ndev;
1003
1004         CLAW_DBF_TEXT(4, trace, "w_retry");
1005         if (p_ch->claw_state == CLAW_STOP) {
1006                 return;
1007         }
1008         claw_strt_out_IO( dev );
1009         CLAW_DBF_TEXT(4, trace, "rtry_xit");
1010         return;
1011 }      /* end of claw_write_retry      */
1012
1013
1014 /*-------------------------------------------------------------------*
1015 *       claw_write_next                                              *
1016 *                                                                    *
1017 *--------------------------------------------------------------------*/
1018
1019 static void
1020 claw_write_next ( struct chbk * p_ch )
1021 {
1022
1023         struct net_device  *dev;
1024         struct claw_privbk *privptr=NULL;
1025         struct sk_buff *pk_skb;
1026
1027         CLAW_DBF_TEXT(4, trace, "claw_wrt");
1028         if (p_ch->claw_state == CLAW_STOP)
1029                 return;
1030         dev = (struct net_device *) p_ch->ndev;
1031         privptr = (struct claw_privbk *) dev->ml_priv;
1032         claw_free_wrt_buf( dev );
1033         if ((privptr->write_free_count > 0) &&
1034             !skb_queue_empty(&p_ch->collect_queue)) {
1035                 pk_skb = claw_pack_skb(privptr);
1036                 while (pk_skb != NULL) {
1037                         claw_hw_tx(pk_skb, dev, 1);
1038                         if (privptr->write_free_count > 0) {
1039                                 pk_skb = claw_pack_skb(privptr);
1040                         } else
1041                                 pk_skb = NULL;
1042                 }
1043         }
1044         if (privptr->p_write_active_first!=NULL) {
1045                 claw_strt_out_IO(dev);
1046         }
1047         return;
1048 }      /* end of claw_write_next      */
1049
1050 /*-------------------------------------------------------------------*
1051 *                                                                    *
1052 *       claw_timer                                                   *
1053 *--------------------------------------------------------------------*/
1054
1055 static void
1056 claw_timer ( struct chbk * p_ch )
1057 {
1058         CLAW_DBF_TEXT(4, trace, "timer");
1059         p_ch->flag |= CLAW_TIMER;
1060         wake_up(&p_ch->wait);
1061         return;
1062 }      /* end of claw_timer  */
1063
1064 /*
1065 *
1066 *       functions
1067 */
1068
1069
1070 /*-------------------------------------------------------------------*
1071 *                                                                    *
1072 *     pages_to_order_of_mag                                          *
1073 *                                                                    *
1074 *    takes a number of pages from 1 to 512 and returns the           *
1075 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1076 *    of magnitude get_free_pages() has an upper order of 9           *
1077 *--------------------------------------------------------------------*/
1078
1079 static int
1080 pages_to_order_of_mag(int num_of_pages)
1081 {
1082         int     order_of_mag=1;         /* assume 2 pages */
1083         int     nump;
1084
1085         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1086         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1087         /* 512 pages = 2Meg on 4k page systems */
1088         if (num_of_pages >= 512) {return 9; }
1089         /* we have two or more pages order is at least 1 */
1090         for (nump=2 ;nump <= 512;nump*=2) {
1091           if (num_of_pages <= nump)
1092                   break;
1093           order_of_mag +=1;
1094         }
1095         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1096         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1097         return order_of_mag;
1098 }
1099
1100 /*-------------------------------------------------------------------*
1101 *                                                                    *
1102 *     add_claw_reads                                                 *
1103 *                                                                    *
1104 *--------------------------------------------------------------------*/
1105 static int
1106 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1107         struct ccwbk* p_last)
1108 {
1109         struct claw_privbk *privptr;
1110         struct ccw1  temp_ccw;
1111         struct endccw * p_end;
1112         CLAW_DBF_TEXT(4, trace, "addreads");
1113         privptr = dev->ml_priv;
1114         p_end = privptr->p_end_ccw;
1115
1116         /* first CCW and last CCW contains a new set of read channel programs
1117         *       to apend the running channel programs
1118         */
1119         if ( p_first==NULL) {
1120                 CLAW_DBF_TEXT(4, trace, "addexit");
1121                 return 0;
1122         }
1123
1124         /* set up ending CCW sequence for this segment */
1125         if (p_end->read1) {
1126                 p_end->read1=0x00;    /*  second ending CCW is now active */
1127                 /*      reset ending CCWs and setup TIC CCWs              */
1128                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1129                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1130                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1131                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1132                 p_end->read2_nop2.cda=0;
1133                 p_end->read2_nop2.count=1;
1134         }
1135         else {
1136                 p_end->read1=0x01;  /* first ending CCW is now active */
1137                 /*      reset ending CCWs and setup TIC CCWs          */
1138                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1139                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1140                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1141                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1142                 p_end->read1_nop2.cda=0;
1143                 p_end->read1_nop2.count=1;
1144         }
1145
1146         if ( privptr-> p_read_active_first ==NULL ) {
1147                 privptr->p_read_active_first = p_first;  /*  set new first */
1148                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1149         }
1150         else {
1151
1152                 /* set up TIC ccw  */
1153                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1154                 temp_ccw.count=0;
1155                 temp_ccw.flags=0;
1156                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1157
1158
1159                 if (p_end->read1) {
1160
1161                /* first set of CCW's is chained to the new read              */
1162                /* chain, so the second set is chained to the active chain.   */
1163                /* Therefore modify the second set to point to the new        */
1164                /* read chain set up TIC CCWs                                 */
1165                /* make sure we update the CCW so channel doesn't fetch it    */
1166                /* when it's only half done                                   */
1167                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1168                                 sizeof(struct ccw1));
1169                         privptr->p_read_active_last->r_TIC_1.cda=
1170                                 (__u32)__pa(&p_first->read);
1171                         privptr->p_read_active_last->r_TIC_2.cda=
1172                                 (__u32)__pa(&p_first->read);
1173                 }
1174                 else {
1175                         /* make sure we update the CCW so channel doesn't   */
1176                         /* fetch it when it is only half done               */
1177                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1178                                 sizeof(struct ccw1));
1179                         privptr->p_read_active_last->r_TIC_1.cda=
1180                                 (__u32)__pa(&p_first->read);
1181                         privptr->p_read_active_last->r_TIC_2.cda=
1182                                 (__u32)__pa(&p_first->read);
1183                 }
1184                 /*      chain in new set of blocks                         */
1185                 privptr->p_read_active_last->next = p_first;
1186                 privptr->p_read_active_last=p_last;
1187         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1188         CLAW_DBF_TEXT(4, trace, "addexit");
1189         return 0;
1190 }    /*     end of add_claw_reads   */
1191
1192 /*-------------------------------------------------------------------*
1193  *   ccw_check_return_code                                           *
1194  *                                                                   *
1195  *-------------------------------------------------------------------*/
1196
1197 static void
1198 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1199 {
1200         CLAW_DBF_TEXT(4, trace, "ccwret");
1201         if (return_code != 0) {
1202                 switch (return_code) {
1203                 case -EBUSY: /* BUSY is a transient state no action needed */
1204                         break;
1205                 case -ENODEV:
1206                         dev_err(&cdev->dev, "The remote channel adapter is not"
1207                                 " available\n");
1208                         break;
1209                 case -EINVAL:
1210                         dev_err(&cdev->dev,
1211                                 "The status of the remote channel adapter"
1212                                 " is not valid\n");
1213                         break;
1214                 default:
1215                         dev_err(&cdev->dev, "The common device layer"
1216                                 " returned error code %d\n",
1217                                   return_code);
1218                 }
1219         }
1220         CLAW_DBF_TEXT(4, trace, "ccwret");
1221 }    /*    end of ccw_check_return_code   */
1222
1223 /*-------------------------------------------------------------------*
1224 *       ccw_check_unit_check                                         *
1225 *--------------------------------------------------------------------*/
1226
1227 static void
1228 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1229 {
1230         struct net_device *ndev = p_ch->ndev;
1231         struct device *dev = &p_ch->cdev->dev;
1232
1233         CLAW_DBF_TEXT(4, trace, "unitchek");
1234         dev_warn(dev, "The communication peer of %s disconnected\n",
1235                 ndev->name);
1236
1237         if (sense & 0x40) {
1238                 if (sense & 0x01) {
1239                         dev_warn(dev, "The remote channel adapter for"
1240                                 " %s has been reset\n",
1241                                 ndev->name);
1242                 }
1243         } else if (sense & 0x20) {
1244                 if (sense & 0x04) {
1245                         dev_warn(dev, "A data streaming timeout occurred"
1246                                 " for %s\n",
1247                                 ndev->name);
1248                 } else if (sense & 0x10) {
1249                         dev_warn(dev, "The remote channel adapter for %s"
1250                                 " is faulty\n",
1251                                 ndev->name);
1252                 } else {
1253                         dev_warn(dev, "A data transfer parity error occurred"
1254                                 " for %s\n",
1255                                 ndev->name);
1256                 }
1257         } else if (sense & 0x10) {
1258                 dev_warn(dev, "A read data parity error occurred"
1259                         " for %s\n",
1260                         ndev->name);
1261         }
1262
1263 }   /*    end of ccw_check_unit_check    */
1264
1265 /*-------------------------------------------------------------------*
1266 *               find_link                                            *
1267 *--------------------------------------------------------------------*/
1268 static int
1269 find_link(struct net_device *dev, char *host_name, char *ws_name )
1270 {
1271         struct claw_privbk *privptr;
1272         struct claw_env *p_env;
1273         int    rc=0;
1274
1275         CLAW_DBF_TEXT(2, setup, "findlink");
1276         privptr = dev->ml_priv;
1277         p_env=privptr->p_env;
1278         switch (p_env->packing)
1279         {
1280                 case  PACKING_ASK:
1281                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1282                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1283                              rc = EINVAL;
1284                         break;
1285                 case  DO_PACKED:
1286                 case  PACK_SEND:
1287                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1288                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1289                                 rc = EINVAL;
1290                         break;
1291                 default:
1292                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1293                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1294                                 rc = EINVAL;
1295                         break;
1296         }
1297
1298         return rc;
1299 }    /*    end of find_link    */
1300
1301 /*-------------------------------------------------------------------*
1302  *   claw_hw_tx                                                      *
1303  *                                                                   *
1304  *                                                                   *
1305  *-------------------------------------------------------------------*/
1306
1307 static int
1308 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1309 {
1310         int                             rc=0;
1311         struct claw_privbk              *privptr;
1312         struct ccwbk           *p_this_ccw;
1313         struct ccwbk           *p_first_ccw;
1314         struct ccwbk           *p_last_ccw;
1315         __u32                           numBuffers;
1316         signed long                     len_of_data;
1317         unsigned long                   bytesInThisBuffer;
1318         unsigned char                   *pDataAddress;
1319         struct endccw                   *pEnd;
1320         struct ccw1                     tempCCW;
1321         struct claw_env                 *p_env;
1322         struct clawph                   *pk_head;
1323         struct chbk                     *ch;
1324
1325         CLAW_DBF_TEXT(4, trace, "hw_tx");
1326         privptr = (struct claw_privbk *)(dev->ml_priv);
1327         p_env =privptr->p_env;
1328         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1329         /*  scan the write queue to free any completed write packets   */
1330         p_first_ccw=NULL;
1331         p_last_ccw=NULL;
1332         if ((p_env->packing >= PACK_SEND) &&
1333             (skb->cb[1] != 'P')) {
1334                 skb_push(skb,sizeof(struct clawph));
1335                 pk_head=(struct clawph *)skb->data;
1336                 pk_head->len=skb->len-sizeof(struct clawph);
1337                 if (pk_head->len%4)  {
1338                         pk_head->len+= 4-(pk_head->len%4);
1339                         skb_pad(skb,4-(pk_head->len%4));
1340                         skb_put(skb,4-(pk_head->len%4));
1341                 }
1342                 if (p_env->packing == DO_PACKED)
1343                         pk_head->link_num = linkid;
1344                 else
1345                         pk_head->link_num = 0;
1346                 pk_head->flag = 0x00;
1347                 skb_pad(skb,4);
1348                 skb->cb[1] = 'P';
1349         }
1350         if (linkid == 0) {
1351                 if (claw_check_busy(dev)) {
1352                         if (privptr->write_free_count!=0) {
1353                                 claw_clear_busy(dev);
1354                         }
1355                         else {
1356                                 claw_strt_out_IO(dev );
1357                                 claw_free_wrt_buf( dev );
1358                                 if (privptr->write_free_count==0) {
1359                                         ch = &privptr->channel[WRITE_CHANNEL];
1360                                         atomic_inc(&skb->users);
1361                                         skb_queue_tail(&ch->collect_queue, skb);
1362                                         goto Done;
1363                                 }
1364                                 else {
1365                                         claw_clear_busy(dev);
1366                                 }
1367                         }
1368                 }
1369                 /*  tx lock  */
1370                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1371                         ch = &privptr->channel[WRITE_CHANNEL];
1372                         atomic_inc(&skb->users);
1373                         skb_queue_tail(&ch->collect_queue, skb);
1374                         claw_strt_out_IO(dev );
1375                         rc=-EBUSY;
1376                         goto Done2;
1377                 }
1378         }
1379         /*      See how many write buffers are required to hold this data */
1380         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1381
1382         /*      If that number of buffers isn't available, give up for now */
1383         if (privptr->write_free_count < numBuffers ||
1384             privptr->p_write_free_chain == NULL ) {
1385
1386                 claw_setbit_busy(TB_NOBUFFER,dev);
1387                 ch = &privptr->channel[WRITE_CHANNEL];
1388                 atomic_inc(&skb->users);
1389                 skb_queue_tail(&ch->collect_queue, skb);
1390                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1391                 goto Done2;
1392         }
1393         pDataAddress=skb->data;
1394         len_of_data=skb->len;
1395
1396         while (len_of_data > 0) {
1397                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1398                 if (p_this_ccw == NULL) { /* lost the race */
1399                         ch = &privptr->channel[WRITE_CHANNEL];
1400                         atomic_inc(&skb->users);
1401                         skb_queue_tail(&ch->collect_queue, skb);
1402                         goto Done2;
1403                 }
1404                 privptr->p_write_free_chain=p_this_ccw->next;
1405                 p_this_ccw->next=NULL;
1406                 --privptr->write_free_count; /* -1 */
1407                 if (len_of_data >= privptr->p_env->write_size)
1408                         bytesInThisBuffer = privptr->p_env->write_size;
1409                 else
1410                         bytesInThisBuffer = len_of_data;
1411                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1412                 len_of_data-=bytesInThisBuffer;
1413                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1414                 /*      setup write CCW         */
1415                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1416                 if (len_of_data>0) {
1417                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1418                 }
1419                 p_this_ccw->write.count=bytesInThisBuffer;
1420                 /*      now add to end of this chain    */
1421                 if (p_first_ccw==NULL)    {
1422                         p_first_ccw=p_this_ccw;
1423                 }
1424                 if (p_last_ccw!=NULL) {
1425                         p_last_ccw->next=p_this_ccw;
1426                         /*      set up TIC ccws         */
1427                         p_last_ccw->w_TIC_1.cda=
1428                                 (__u32)__pa(&p_this_ccw->write);
1429                 }
1430                 p_last_ccw=p_this_ccw;      /* save new last block */
1431         }
1432
1433         /*      FirstCCW and LastCCW now contain a new set of write channel
1434         *       programs to append to the running channel program
1435         */
1436
1437         if (p_first_ccw!=NULL) {
1438                 /*      setup ending ccw sequence for this segment           */
1439                 pEnd=privptr->p_end_ccw;
1440                 if (pEnd->write1) {
1441                         pEnd->write1=0x00;   /* second end ccw is now active */
1442                         /*      set up Tic CCWs         */
1443                         p_last_ccw->w_TIC_1.cda=
1444                                 (__u32)__pa(&pEnd->write2_nop1);
1445                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1446                         pEnd->write2_nop2.flags    =
1447                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1448                         pEnd->write2_nop2.cda=0;
1449                         pEnd->write2_nop2.count=1;
1450                 }
1451                 else {  /*  end of if (pEnd->write1)*/
1452                         pEnd->write1=0x01;   /* first end ccw is now active */
1453                         /*      set up Tic CCWs         */
1454                         p_last_ccw->w_TIC_1.cda=
1455                                 (__u32)__pa(&pEnd->write1_nop1);
1456                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1457                         pEnd->write1_nop2.flags    =
1458                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1459                         pEnd->write1_nop2.cda=0;
1460                         pEnd->write1_nop2.count=1;
1461                 }  /* end if if (pEnd->write1) */
1462
1463                 if (privptr->p_write_active_first==NULL ) {
1464                         privptr->p_write_active_first=p_first_ccw;
1465                         privptr->p_write_active_last=p_last_ccw;
1466                 }
1467                 else {
1468                         /*      set up Tic CCWs         */
1469
1470                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1471                         tempCCW.count=0;
1472                         tempCCW.flags=0;
1473                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1474
1475                         if (pEnd->write1) {
1476
1477                  /*
1478                  * first set of ending CCW's is chained to the new write
1479                  * chain, so the second set is chained to the active chain
1480                  * Therefore modify the second set to point the new write chain.
1481                  * make sure we update the CCW atomically
1482                  * so channel does not fetch it when it's only half done
1483                  */
1484                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1485                                         sizeof(struct ccw1));
1486                                 privptr->p_write_active_last->w_TIC_1.cda=
1487                                         (__u32)__pa(&p_first_ccw->write);
1488                         }
1489                         else {
1490
1491                         /*make sure we update the CCW atomically
1492                          *so channel does not fetch it when it's only half done
1493                          */
1494                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1495                                         sizeof(struct ccw1));
1496                                 privptr->p_write_active_last->w_TIC_1.cda=
1497                                         (__u32)__pa(&p_first_ccw->write);
1498
1499                         } /* end if if (pEnd->write1) */
1500
1501                         privptr->p_write_active_last->next=p_first_ccw;
1502                         privptr->p_write_active_last=p_last_ccw;
1503                 }
1504
1505         } /* endif (p_first_ccw!=NULL)  */
1506         dev_kfree_skb_any(skb);
1507         claw_strt_out_IO(dev );
1508         /*      if write free count is zero , set NOBUFFER       */
1509         if (privptr->write_free_count==0) {
1510                 claw_setbit_busy(TB_NOBUFFER,dev);
1511         }
1512 Done2:
1513         claw_clearbit_busy(TB_TX,dev);
1514 Done:
1515         return(rc);
1516 }    /*    end of claw_hw_tx    */
1517
1518 /*-------------------------------------------------------------------*
1519 *                                                                    *
1520 *     init_ccw_bk                                                    *
1521 *                                                                    *
1522 *--------------------------------------------------------------------*/
1523
1524 static int
1525 init_ccw_bk(struct net_device *dev)
1526 {
1527
1528         __u32   ccw_blocks_required;
1529         __u32   ccw_blocks_perpage;
1530         __u32   ccw_pages_required;
1531         __u32   claw_reads_perpage=1;
1532         __u32   claw_read_pages;
1533         __u32   claw_writes_perpage=1;
1534         __u32   claw_write_pages;
1535         void    *p_buff=NULL;
1536         struct ccwbk*p_free_chain;
1537         struct ccwbk*p_buf;
1538         struct ccwbk*p_last_CCWB;
1539         struct ccwbk*p_first_CCWB;
1540         struct endccw *p_endccw=NULL;
1541         addr_t  real_address;
1542         struct claw_privbk *privptr = dev->ml_priv;
1543         struct clawh *pClawH=NULL;
1544         addr_t   real_TIC_address;
1545         int i,j;
1546         CLAW_DBF_TEXT(4, trace, "init_ccw");
1547
1548         /*  initialize  statistics field */
1549         privptr->active_link_ID=0;
1550         /*  initialize  ccwbk pointers  */
1551         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1552         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1553         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1554         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1555         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1556         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1557         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1558         privptr->buffs_alloc = 0;
1559         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1560         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1561         /*  initialize  free write ccwbk counter  */
1562         privptr->write_free_count=0;  /* number of free bufs on write chain */
1563         p_last_CCWB = NULL;
1564         p_first_CCWB= NULL;
1565         /*
1566         *  We need 1 CCW block for each read buffer, 1 for each
1567         *  write buffer, plus 1 for ClawSignalBlock
1568         */
1569         ccw_blocks_required =
1570                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1571         /*
1572         * compute number of CCW blocks that will fit in a page
1573         */
1574         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1575         ccw_pages_required=
1576                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1577
1578         /*
1579          *  read and write sizes are set by 2 constants in claw.h
1580          *  4k and 32k.  Unpacked values other than 4k are not going to
1581          * provide good performance. With packing buffers support 32k
1582          * buffers are used.
1583          */
1584         if (privptr->p_env->read_size < PAGE_SIZE) {
1585                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1586                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1587                                                 claw_reads_perpage);
1588          }
1589          else {       /* > or equal  */
1590                 privptr->p_buff_pages_perread =
1591                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1592                 claw_read_pages = privptr->p_env->read_buffers *
1593                                         privptr->p_buff_pages_perread;
1594          }
1595         if (privptr->p_env->write_size < PAGE_SIZE) {
1596                 claw_writes_perpage =
1597                         PAGE_SIZE / privptr->p_env->write_size;
1598                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1599                                                 claw_writes_perpage);
1600
1601         }
1602         else {      /* >  or equal  */
1603                 privptr->p_buff_pages_perwrite =
1604                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1605                 claw_write_pages = privptr->p_env->write_buffers *
1606                                         privptr->p_buff_pages_perwrite;
1607         }
1608         /*
1609         *               allocate ccw_pages_required
1610         */
1611         if (privptr->p_buff_ccw==NULL) {
1612                 privptr->p_buff_ccw=
1613                         (void *)__get_free_pages(__GFP_DMA,
1614                         (int)pages_to_order_of_mag(ccw_pages_required ));
1615                 if (privptr->p_buff_ccw==NULL) {
1616                         return -ENOMEM;
1617                 }
1618                 privptr->p_buff_ccw_num=ccw_pages_required;
1619         }
1620         memset(privptr->p_buff_ccw, 0x00,
1621                 privptr->p_buff_ccw_num * PAGE_SIZE);
1622
1623         /*
1624         *               obtain ending ccw block address
1625         *
1626         */
1627         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1628         real_address  = (__u32)__pa(privptr->p_end_ccw);
1629         /*                              Initialize ending CCW block       */
1630         p_endccw=privptr->p_end_ccw;
1631         p_endccw->real=real_address;
1632         p_endccw->write1=0x00;
1633         p_endccw->read1=0x00;
1634
1635         /*      write1_nop1                                     */
1636         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1637         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1638         p_endccw->write1_nop1.count       = 1;
1639         p_endccw->write1_nop1.cda         = 0;
1640
1641         /*      write1_nop2                                     */
1642         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1643         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1644         p_endccw->write1_nop2.count      = 1;
1645         p_endccw->write1_nop2.cda        = 0;
1646
1647         /*      write2_nop1                                     */
1648         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1649         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1650         p_endccw->write2_nop1.count        = 1;
1651         p_endccw->write2_nop1.cda          = 0;
1652
1653         /*      write2_nop2                                     */
1654         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1655         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1656         p_endccw->write2_nop2.count        = 1;
1657         p_endccw->write2_nop2.cda          = 0;
1658
1659         /*      read1_nop1                                      */
1660         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1661         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1662         p_endccw->read1_nop1.count        = 1;
1663         p_endccw->read1_nop1.cda          = 0;
1664
1665         /*      read1_nop2                                      */
1666         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1667         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1668         p_endccw->read1_nop2.count        = 1;
1669         p_endccw->read1_nop2.cda          = 0;
1670
1671         /*      read2_nop1                                      */
1672         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1673         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1674         p_endccw->read2_nop1.count        = 1;
1675         p_endccw->read2_nop1.cda          = 0;
1676
1677         /*      read2_nop2                                      */
1678         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1679         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1680         p_endccw->read2_nop2.count        = 1;
1681         p_endccw->read2_nop2.cda          = 0;
1682
1683         /*
1684         *                               Build a chain of CCWs
1685         *
1686         */
1687         p_buff=privptr->p_buff_ccw;
1688
1689         p_free_chain=NULL;
1690         for (i=0 ; i < ccw_pages_required; i++ ) {
1691                 real_address  = (__u32)__pa(p_buff);
1692                 p_buf=p_buff;
1693                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1694                         p_buf->next  = p_free_chain;
1695                         p_free_chain = p_buf;
1696                         p_buf->real=(__u32)__pa(p_buf);
1697                         ++p_buf;
1698                 }
1699                 p_buff+=PAGE_SIZE;
1700         }
1701         /*
1702         *                               Initialize ClawSignalBlock
1703         *
1704         */
1705         if (privptr->p_claw_signal_blk==NULL) {
1706                 privptr->p_claw_signal_blk=p_free_chain;
1707                 p_free_chain=p_free_chain->next;
1708                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1709                 pClawH->length=0xffff;
1710                 pClawH->opcode=0xff;
1711                 pClawH->flag=CLAW_BUSY;
1712         }
1713
1714         /*
1715         *               allocate write_pages_required and add to free chain
1716         */
1717         if (privptr->p_buff_write==NULL) {
1718             if (privptr->p_env->write_size < PAGE_SIZE) {
1719                 privptr->p_buff_write=
1720                         (void *)__get_free_pages(__GFP_DMA,
1721                         (int)pages_to_order_of_mag(claw_write_pages ));
1722                 if (privptr->p_buff_write==NULL) {
1723                         privptr->p_buff_ccw=NULL;
1724                         return -ENOMEM;
1725                 }
1726                 /*
1727                 *                               Build CLAW write free chain
1728                 *
1729                 */
1730
1731                 memset(privptr->p_buff_write, 0x00,
1732                         ccw_pages_required * PAGE_SIZE);
1733                 privptr->p_write_free_chain=NULL;
1734
1735                 p_buff=privptr->p_buff_write;
1736
1737                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1738                         p_buf        = p_free_chain;      /*  get a CCW */
1739                         p_free_chain = p_buf->next;
1740                         p_buf->next  =privptr->p_write_free_chain;
1741                         privptr->p_write_free_chain = p_buf;
1742                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1743                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1744                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1745                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1746                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1747                         p_buf-> w_read_FF.count   = 1;
1748                         p_buf-> w_read_FF.cda     =
1749                                 (__u32)__pa(&p_buf-> header.flag);
1750                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1751                         p_buf-> w_TIC_1.flags      = 0;
1752                         p_buf-> w_TIC_1.count      = 0;
1753
1754                         if (((unsigned long)p_buff +
1755                                             privptr->p_env->write_size) >=
1756                            ((unsigned long)(p_buff+2*
1757                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1758                                 p_buff = p_buff+privptr->p_env->write_size;
1759                         }
1760                 }
1761            }
1762            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1763            {
1764                privptr->p_write_free_chain=NULL;
1765                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1766                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1767                         (int)pages_to_order_of_mag(
1768                         privptr->p_buff_pages_perwrite) );
1769                    if (p_buff==NULL) {
1770                         free_pages((unsigned long)privptr->p_buff_ccw,
1771                               (int)pages_to_order_of_mag(
1772                                         privptr->p_buff_ccw_num));
1773                         privptr->p_buff_ccw=NULL;
1774                         p_buf=privptr->p_buff_write;
1775                         while (p_buf!=NULL) {
1776                                 free_pages((unsigned long)
1777                                         p_buf->p_buffer,
1778                                         (int)pages_to_order_of_mag(
1779                                         privptr->p_buff_pages_perwrite));
1780                                 p_buf=p_buf->next;
1781                         }
1782                         return -ENOMEM;
1783                    }  /* Error on get_pages   */
1784                    memset(p_buff, 0x00, privptr->p_env->write_size );
1785                    p_buf         = p_free_chain;
1786                    p_free_chain  = p_buf->next;
1787                    p_buf->next   = privptr->p_write_free_chain;
1788                    privptr->p_write_free_chain = p_buf;
1789                    privptr->p_buff_write = p_buf;
1790                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1791                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1792                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1793                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1794                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1795                    p_buf-> w_read_FF.count    = 1;
1796                    p_buf-> w_read_FF.cda      =
1797                         (__u32)__pa(&p_buf-> header.flag);
1798                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1799                    p_buf-> w_TIC_1.flags   = 0;
1800                    p_buf-> w_TIC_1.count   = 0;
1801                }  /* for all write_buffers   */
1802
1803            }    /* else buffers are PAGE_SIZE or bigger */
1804
1805         }
1806         privptr->p_buff_write_num=claw_write_pages;
1807         privptr->write_free_count=privptr->p_env->write_buffers;
1808
1809
1810         /*
1811         *               allocate read_pages_required and chain to free chain
1812         */
1813         if (privptr->p_buff_read==NULL) {
1814             if (privptr->p_env->read_size < PAGE_SIZE)  {
1815                 privptr->p_buff_read=
1816                         (void *)__get_free_pages(__GFP_DMA,
1817                         (int)pages_to_order_of_mag(claw_read_pages) );
1818                 if (privptr->p_buff_read==NULL) {
1819                         free_pages((unsigned long)privptr->p_buff_ccw,
1820                                 (int)pages_to_order_of_mag(
1821                                         privptr->p_buff_ccw_num));
1822                         /* free the write pages size is < page size  */
1823                         free_pages((unsigned long)privptr->p_buff_write,
1824                                 (int)pages_to_order_of_mag(
1825                                 privptr->p_buff_write_num));
1826                         privptr->p_buff_ccw=NULL;
1827                         privptr->p_buff_write=NULL;
1828                         return -ENOMEM;
1829                 }
1830                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1831                 privptr->p_buff_read_num=claw_read_pages;
1832                 /*
1833                 *                               Build CLAW read free chain
1834                 *
1835                 */
1836                 p_buff=privptr->p_buff_read;
1837                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1838                         p_buf        = p_free_chain;
1839                         p_free_chain = p_buf->next;
1840
1841                         if (p_last_CCWB==NULL) {
1842                                 p_buf->next=NULL;
1843                                 real_TIC_address=0;
1844                                 p_last_CCWB=p_buf;
1845                         }
1846                         else {
1847                                 p_buf->next=p_first_CCWB;
1848                                 real_TIC_address=
1849                                 (__u32)__pa(&p_first_CCWB -> read );
1850                         }
1851
1852                         p_first_CCWB=p_buf;
1853
1854                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1855                         /*  initialize read command */
1856                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1857                         p_buf-> read.cda = (__u32)__pa(p_buff);
1858                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1859                         p_buf-> read.count       = privptr->p_env->read_size;
1860
1861                         /*  initialize read_h command */
1862                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1863                         p_buf-> read_h.cda =
1864                                 (__u32)__pa(&(p_buf->header));
1865                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1866                         p_buf-> read_h.count      = sizeof(struct clawh);
1867
1868                         /*  initialize Signal command */
1869                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1870                         p_buf-> signal.cda =
1871                                 (__u32)__pa(&(pClawH->flag));
1872                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1873                         p_buf-> signal.count     = 1;
1874
1875                         /*  initialize r_TIC_1 command */
1876                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1877                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1878                         p_buf-> r_TIC_1.flags = 0;
1879                         p_buf-> r_TIC_1.count      = 0;
1880
1881                         /*  initialize r_read_FF command */
1882                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1883                         p_buf-> r_read_FF.cda =
1884                                 (__u32)__pa(&(pClawH->flag));
1885                         p_buf-> r_read_FF.flags =
1886                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1887                         p_buf-> r_read_FF.count    = 1;
1888
1889                         /*    initialize r_TIC_2          */
1890                         memcpy(&p_buf->r_TIC_2,
1891                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1892
1893                         /*     initialize Header     */
1894                         p_buf->header.length=0xffff;
1895                         p_buf->header.opcode=0xff;
1896                         p_buf->header.flag=CLAW_PENDING;
1897
1898                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1899                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1900                                  -1)
1901                            & PAGE_MASK)) {
1902                                 p_buff= p_buff+privptr->p_env->read_size;
1903                         }
1904                         else {
1905                                 p_buff=
1906                                 (void *)((unsigned long)
1907                                         (p_buff+2*(privptr->p_env->read_size)-1)
1908                                          & PAGE_MASK) ;
1909                         }
1910                 }   /* for read_buffers   */
1911           }         /* read_size < PAGE_SIZE  */
1912           else {  /* read Size >= PAGE_SIZE  */
1913                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1914                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1915                                 (int)pages_to_order_of_mag(
1916                                         privptr->p_buff_pages_perread));
1917                         if (p_buff==NULL) {
1918                                 free_pages((unsigned long)privptr->p_buff_ccw,
1919                                         (int)pages_to_order_of_mag(privptr->
1920                                         p_buff_ccw_num));
1921                                 /* free the write pages  */
1922                                 p_buf=privptr->p_buff_write;
1923                                 while (p_buf!=NULL) {
1924                                         free_pages(
1925                                             (unsigned long)p_buf->p_buffer,
1926                                             (int)pages_to_order_of_mag(
1927                                             privptr->p_buff_pages_perwrite));
1928                                         p_buf=p_buf->next;
1929                                 }
1930                                 /* free any read pages already alloc  */
1931                                 p_buf=privptr->p_buff_read;
1932                                 while (p_buf!=NULL) {
1933                                         free_pages(
1934                                             (unsigned long)p_buf->p_buffer,
1935                                             (int)pages_to_order_of_mag(
1936                                              privptr->p_buff_pages_perread));
1937                                         p_buf=p_buf->next;
1938                                 }
1939                                 privptr->p_buff_ccw=NULL;
1940                                 privptr->p_buff_write=NULL;
1941                                 return -ENOMEM;
1942                         }
1943                         memset(p_buff, 0x00, privptr->p_env->read_size);
1944                         p_buf        = p_free_chain;
1945                         privptr->p_buff_read = p_buf;
1946                         p_free_chain = p_buf->next;
1947
1948                         if (p_last_CCWB==NULL) {
1949                                 p_buf->next=NULL;
1950                                 real_TIC_address=0;
1951                                 p_last_CCWB=p_buf;
1952                         }
1953                         else {
1954                                 p_buf->next=p_first_CCWB;
1955                                 real_TIC_address=
1956                                         (addr_t)__pa(
1957                                                 &p_first_CCWB -> read );
1958                         }
1959
1960                         p_first_CCWB=p_buf;
1961                                 /* save buff address */
1962                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1963                         /*  initialize read command */
1964                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1965                         p_buf-> read.cda = (__u32)__pa(p_buff);
1966                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1967                         p_buf-> read.count       = privptr->p_env->read_size;
1968
1969                         /*  initialize read_h command */
1970                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1971                         p_buf-> read_h.cda =
1972                                 (__u32)__pa(&(p_buf->header));
1973                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1974                         p_buf-> read_h.count      = sizeof(struct clawh);
1975
1976                         /*  initialize Signal command */
1977                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1978                         p_buf-> signal.cda =
1979                                 (__u32)__pa(&(pClawH->flag));
1980                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1981                         p_buf-> signal.count     = 1;
1982
1983                         /*  initialize r_TIC_1 command */
1984                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1985                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1986                         p_buf-> r_TIC_1.flags = 0;
1987                         p_buf-> r_TIC_1.count      = 0;
1988
1989                         /*  initialize r_read_FF command */
1990                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1991                         p_buf-> r_read_FF.cda =
1992                                 (__u32)__pa(&(pClawH->flag));
1993                         p_buf-> r_read_FF.flags =
1994                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1995                         p_buf-> r_read_FF.count    = 1;
1996
1997                         /*    initialize r_TIC_2          */
1998                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1999                                 sizeof(struct ccw1));
2000
2001                         /*     initialize Header     */
2002                         p_buf->header.length=0xffff;
2003                         p_buf->header.opcode=0xff;
2004                         p_buf->header.flag=CLAW_PENDING;
2005
2006                 }    /* For read_buffers   */
2007           }     /*  read_size >= PAGE_SIZE   */
2008         }       /*  pBuffread = NULL */
2009         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
2010         privptr->buffs_alloc = 1;
2011
2012         return 0;
2013 }    /*    end of init_ccw_bk */
2014
2015 /*-------------------------------------------------------------------*
2016 *                                                                    *
2017 *       probe_error                                                  *
2018 *                                                                    *
2019 *--------------------------------------------------------------------*/
2020
2021 static void
2022 probe_error( struct ccwgroup_device *cgdev)
2023 {
2024         struct claw_privbk *privptr;
2025
2026         CLAW_DBF_TEXT(4, trace, "proberr");
2027         privptr = dev_get_drvdata(&cgdev->dev);
2028         if (privptr != NULL) {
2029                 dev_set_drvdata(&cgdev->dev, NULL);
2030                 kfree(privptr->p_env);
2031                 kfree(privptr->p_mtc_envelope);
2032                 kfree(privptr);
2033         }
2034 }    /*    probe_error    */
2035
2036 /*-------------------------------------------------------------------*
2037 *    claw_process_control                                            *
2038 *                                                                    *
2039 *                                                                    *
2040 *--------------------------------------------------------------------*/
2041
2042 static int
2043 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
2044 {
2045
2046         struct clawbuf *p_buf;
2047         struct clawctl  ctlbk;
2048         struct clawctl *p_ctlbk;
2049         char    temp_host_name[8];
2050         char    temp_ws_name[8];
2051         struct claw_privbk *privptr;
2052         struct claw_env *p_env;
2053         struct sysval *p_sysval;
2054         struct conncmd *p_connect=NULL;
2055         int rc;
2056         struct chbk *p_ch = NULL;
2057         struct device *tdev;
2058         CLAW_DBF_TEXT(2, setup, "clw_cntl");
2059         udelay(1000);  /* Wait a ms for the control packets to
2060                         *catch up to each other */
2061         privptr = dev->ml_priv;
2062         p_env=privptr->p_env;
2063         tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
2064         memcpy( &temp_host_name, p_env->host_name, 8);
2065         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2066         dev_info(tdev, "%s: CLAW device %.8s: "
2067                 "Received Control Packet\n",
2068                 dev->name, temp_ws_name);
2069         if (privptr->release_pend==1) {
2070                 return 0;
2071         }
2072         p_buf=p_ccw->p_buffer;
2073         p_ctlbk=&ctlbk;
2074         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2075                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2076         } else {
2077                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2078         }
2079         switch (p_ctlbk->command)
2080         {
2081         case SYSTEM_VALIDATE_REQUEST:
2082                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2083                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2084                                 CLAW_RC_WRONG_VERSION);
2085                         dev_warn(tdev, "The communication peer of %s"
2086                                 " uses an incorrect API version %d\n",
2087                                 dev->name, p_ctlbk->version);
2088                 }
2089                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2090                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2091                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2092                         "Host name=%.8s\n",
2093                         dev->name, p_ctlbk->version,
2094                         p_ctlbk->linkid,
2095                         p_ctlbk->correlator,
2096                         p_sysval->WS_name,
2097                         p_sysval->host_name);
2098                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2099                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2100                                 CLAW_RC_NAME_MISMATCH);
2101                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2102                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2103                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2104                         dev_warn(tdev,
2105                                 "Host name %s for %s does not match the"
2106                                 " remote adapter name %s\n",
2107                                 p_sysval->host_name,
2108                                 dev->name,
2109                                 temp_host_name);
2110                 }
2111                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2112                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2113                                 CLAW_RC_NAME_MISMATCH);
2114                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2115                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2116                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2117                         dev_warn(tdev, "Adapter name %s for %s does not match"
2118                                 " the remote host name %s\n",
2119                                 p_sysval->WS_name,
2120                                 dev->name,
2121                                 temp_ws_name);
2122                 }
2123                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2124                     (p_env->packing == 0)) {
2125                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2126                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2127                         dev_warn(tdev,
2128                                 "The local write buffer is smaller than the"
2129                                 " remote read buffer\n");
2130                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2131                 }
2132                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2133                     (p_env->packing == 0)) {
2134                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2135                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2136                         dev_warn(tdev,
2137                                 "The local read buffer is smaller than the"
2138                                 " remote write buffer\n");
2139                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2140                 }
2141                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2142                 dev_info(tdev,
2143                         "CLAW device %.8s: System validate"
2144                         " completed.\n", temp_ws_name);
2145                 dev_info(tdev,
2146                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2147                         dev->name, p_sysval->read_frame_size,
2148                         p_sysval->write_frame_size);
2149                 privptr->system_validate_comp = 1;
2150                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2151                         p_env->packing = PACKING_ASK;
2152                 claw_strt_conn_req(dev);
2153                 break;
2154         case SYSTEM_VALIDATE_RESPONSE:
2155                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2156                 dev_info(tdev,
2157                         "Settings for %s validated (version=%d, "
2158                         "remote device=%d, rc=%d, adapter name=%.8s, "
2159                         "host name=%.8s)\n",
2160                         dev->name,
2161                         p_ctlbk->version,
2162                         p_ctlbk->correlator,
2163                         p_ctlbk->rc,
2164                         p_sysval->WS_name,
2165                         p_sysval->host_name);
2166                 switch (p_ctlbk->rc) {
2167                 case 0:
2168                         dev_info(tdev, "%s: CLAW device "
2169                                 "%.8s: System validate completed.\n",
2170                                 dev->name, temp_ws_name);
2171                         if (privptr->system_validate_comp == 0)
2172                                 claw_strt_conn_req(dev);
2173                         privptr->system_validate_comp = 1;
2174                         break;
2175                 case CLAW_RC_NAME_MISMATCH:
2176                         dev_warn(tdev, "Validating %s failed because of"
2177                                 " a host or adapter name mismatch\n",
2178                                 dev->name);
2179                         break;
2180                 case CLAW_RC_WRONG_VERSION:
2181                         dev_warn(tdev, "Validating %s failed because of a"
2182                                 " version conflict\n",
2183                                 dev->name);
2184                         break;
2185                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2186                         dev_warn(tdev, "Validating %s failed because of a"
2187                                 " frame size conflict\n",
2188                                 dev->name);
2189                         break;
2190                 default:
2191                         dev_warn(tdev, "The communication peer of %s rejected"
2192                                 " the connection\n",
2193                                  dev->name);
2194                         break;
2195                 }
2196                 break;
2197
2198         case CONNECTION_REQUEST:
2199                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2200                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2201                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2202                         dev->name,
2203                         p_ctlbk->version,
2204                         p_ctlbk->linkid,
2205                         p_ctlbk->correlator,
2206                         p_connect->host_name,
2207                         p_connect->WS_name);
2208                 if (privptr->active_link_ID != 0) {
2209                         claw_snd_disc(dev, p_ctlbk);
2210                         dev_info(tdev, "%s rejected a connection request"
2211                                 " because it is already active\n",
2212                                 dev->name);
2213                 }
2214                 if (p_ctlbk->linkid != 1) {
2215                         claw_snd_disc(dev, p_ctlbk);
2216                         dev_info(tdev, "%s rejected a request to open multiple"
2217                                 " connections\n",
2218                                 dev->name);
2219                 }
2220                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2221                 if (rc != 0) {
2222                         claw_snd_disc(dev, p_ctlbk);
2223                         dev_info(tdev, "%s rejected a connection request"
2224                                 " because of a type mismatch\n",
2225                                 dev->name);
2226                 }
2227                 claw_send_control(dev,
2228                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2229                         p_ctlbk->correlator,
2230                         0, p_connect->host_name,
2231                         p_connect->WS_name);
2232                 if (p_env->packing == PACKING_ASK) {
2233                         p_env->packing = PACK_SEND;
2234                         claw_snd_conn_req(dev, 0);
2235                 }
2236                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2237                         "completed link_id=%d.\n",
2238                         dev->name, temp_ws_name,
2239                         p_ctlbk->linkid);
2240                         privptr->active_link_ID = p_ctlbk->linkid;
2241                         p_ch = &privptr->channel[WRITE_CHANNEL];
2242                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2243                 break;
2244         case CONNECTION_RESPONSE:
2245                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2246                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2247                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2248                         dev->name,
2249                         p_ctlbk->version,
2250                         p_ctlbk->linkid,
2251                         p_ctlbk->correlator,
2252                         p_ctlbk->rc,
2253                         p_connect->host_name,
2254                         p_connect->WS_name);
2255
2256                 if (p_ctlbk->rc != 0) {
2257                         dev_warn(tdev, "The communication peer of %s rejected"
2258                                 " a connection request\n",
2259                                 dev->name);
2260                         return 1;
2261                 }
2262                 rc = find_link(dev,
2263                         p_connect->host_name, p_connect->WS_name);
2264                 if (rc != 0) {
2265                         claw_snd_disc(dev, p_ctlbk);
2266                         dev_warn(tdev, "The communication peer of %s"
2267                                 " rejected a connection "
2268                                 "request because of a type mismatch\n",
2269                                  dev->name);
2270                 }
2271                 /* should be until CONNECTION_CONFIRM */
2272                 privptr->active_link_ID = -(p_ctlbk->linkid);
2273                 break;
2274         case CONNECTION_CONFIRM:
2275                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2276                 dev_info(tdev,
2277                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2278                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2279                         dev->name,
2280                         p_ctlbk->version,
2281                         p_ctlbk->linkid,
2282                         p_ctlbk->correlator,
2283                         p_connect->host_name,
2284                         p_connect->WS_name);
2285                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2286                         privptr->active_link_ID = p_ctlbk->linkid;
2287                         if (p_env->packing > PACKING_ASK) {
2288                                 dev_info(tdev,
2289                                 "%s: Confirmed Now packing\n", dev->name);
2290                                 p_env->packing = DO_PACKED;
2291                         }
2292                         p_ch = &privptr->channel[WRITE_CHANNEL];
2293                         wake_up(&p_ch->wait);
2294                 } else {
2295                         dev_warn(tdev, "Activating %s failed because of"
2296                                 " an incorrect link ID=%d\n",
2297                                 dev->name, p_ctlbk->linkid);
2298                         claw_snd_disc(dev, p_ctlbk);
2299                 }
2300                 break;
2301         case DISCONNECT:
2302                 dev_info(tdev, "%s: Disconnect: "
2303                         "Vers=%d,link_id=%d,Corr=%d\n",
2304                         dev->name, p_ctlbk->version,
2305                         p_ctlbk->linkid, p_ctlbk->correlator);
2306                 if ((p_ctlbk->linkid == 2) &&
2307                     (p_env->packing == PACK_SEND)) {
2308                         privptr->active_link_ID = 1;
2309                         p_env->packing = DO_PACKED;
2310                 } else
2311                         privptr->active_link_ID = 0;
2312                 break;
2313         case CLAW_ERROR:
2314                 dev_warn(tdev, "The communication peer of %s failed\n",
2315                         dev->name);
2316                 break;
2317         default:
2318                 dev_warn(tdev, "The communication peer of %s sent"
2319                         " an unknown command code\n",
2320                         dev->name);
2321                 break;
2322         }
2323
2324         return 0;
2325 }   /*    end of claw_process_control    */
2326
2327
2328 /*-------------------------------------------------------------------*
2329 *               claw_send_control                                    *
2330 *                                                                    *
2331 *--------------------------------------------------------------------*/
2332
2333 static int
2334 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2335          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2336 {
2337         struct claw_privbk              *privptr;
2338         struct clawctl                  *p_ctl;
2339         struct sysval                   *p_sysval;
2340         struct conncmd                  *p_connect;
2341         struct sk_buff                  *skb;
2342
2343         CLAW_DBF_TEXT(2, setup, "sndcntl");
2344         privptr = dev->ml_priv;
2345         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2346
2347         p_ctl->command=type;
2348         p_ctl->version=CLAW_VERSION_ID;
2349         p_ctl->linkid=link;
2350         p_ctl->correlator=correlator;
2351         p_ctl->rc=rc;
2352
2353         p_sysval=(struct sysval *)&p_ctl->data;
2354         p_connect=(struct conncmd *)&p_ctl->data;
2355
2356         switch (p_ctl->command) {
2357                 case SYSTEM_VALIDATE_REQUEST:
2358                 case SYSTEM_VALIDATE_RESPONSE:
2359                         memcpy(&p_sysval->host_name, local_name, 8);
2360                         memcpy(&p_sysval->WS_name, remote_name, 8);
2361                         if (privptr->p_env->packing > 0) {
2362                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2363                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2364                         } else {
2365                                 /* how big is the biggest group of packets */
2366                            p_sysval->read_frame_size =
2367                                 privptr->p_env->read_size;
2368                            p_sysval->write_frame_size =
2369                                 privptr->p_env->write_size;
2370                         }
2371                         memset(&p_sysval->reserved, 0x00, 4);
2372                         break;
2373                 case CONNECTION_REQUEST:
2374                 case CONNECTION_RESPONSE:
2375                 case CONNECTION_CONFIRM:
2376                 case DISCONNECT:
2377                         memcpy(&p_sysval->host_name, local_name, 8);
2378                         memcpy(&p_sysval->WS_name, remote_name, 8);
2379                         if (privptr->p_env->packing > 0) {
2380                         /* How big is the biggest packet */
2381                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2382                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2383                         } else {
2384                                 memset(&p_connect->reserved1, 0x00, 4);
2385                                 memset(&p_connect->reserved2, 0x00, 4);
2386                         }
2387                         break;
2388                 default:
2389                         break;
2390         }
2391
2392         /*      write Control Record to the device                   */
2393
2394
2395         skb = dev_alloc_skb(sizeof(struct clawctl));
2396         if (!skb) {
2397                 return -ENOMEM;
2398         }
2399         memcpy(skb_put(skb, sizeof(struct clawctl)),
2400                 p_ctl, sizeof(struct clawctl));
2401         if (privptr->p_env->packing >= PACK_SEND)
2402                 claw_hw_tx(skb, dev, 1);
2403         else
2404                 claw_hw_tx(skb, dev, 0);
2405         return 0;
2406 }  /*   end of claw_send_control  */
2407
2408 /*-------------------------------------------------------------------*
2409 *               claw_snd_conn_req                                    *
2410 *                                                                    *
2411 *--------------------------------------------------------------------*/
2412 static int
2413 claw_snd_conn_req(struct net_device *dev, __u8 link)
2414 {
2415         int                rc;
2416         struct claw_privbk *privptr = dev->ml_priv;
2417         struct clawctl     *p_ctl;
2418
2419         CLAW_DBF_TEXT(2, setup, "snd_conn");
2420         rc = 1;
2421         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2422         p_ctl->linkid = link;
2423         if ( privptr->system_validate_comp==0x00 ) {
2424                 return rc;
2425         }
2426         if (privptr->p_env->packing == PACKING_ASK )
2427                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2428                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2429         if (privptr->p_env->packing == PACK_SEND)  {
2430                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2431                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2432         }
2433         if (privptr->p_env->packing == 0)
2434                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2435                         HOST_APPL_NAME, privptr->p_env->api_type);
2436         return rc;
2437
2438 }  /*  end of claw_snd_conn_req */
2439
2440
2441 /*-------------------------------------------------------------------*
2442 *               claw_snd_disc                                        *
2443 *                                                                    *
2444 *--------------------------------------------------------------------*/
2445
2446 static int
2447 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2448 {
2449         int rc;
2450         struct conncmd *  p_connect;
2451
2452         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2453         p_connect=(struct conncmd *)&p_ctl->data;
2454
2455         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2456                 p_ctl->correlator, 0,
2457                 p_connect->host_name, p_connect->WS_name);
2458         return rc;
2459 }     /*   end of claw_snd_disc    */
2460
2461
2462 /*-------------------------------------------------------------------*
2463 *               claw_snd_sys_validate_rsp                            *
2464 *                                                                    *
2465 *--------------------------------------------------------------------*/
2466
2467 static int
2468 claw_snd_sys_validate_rsp(struct net_device *dev,
2469         struct clawctl *p_ctl, __u32 return_code)
2470 {
2471         struct claw_env *  p_env;
2472         struct claw_privbk *privptr;
2473         int    rc;
2474
2475         CLAW_DBF_TEXT(2, setup, "chkresp");
2476         privptr = dev->ml_priv;
2477         p_env=privptr->p_env;
2478         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2479                 p_ctl->linkid,
2480                 p_ctl->correlator,
2481                 return_code,
2482                 p_env->host_name,
2483                 p_env->adapter_name  );
2484         return rc;
2485 }     /*    end of claw_snd_sys_validate_rsp    */
2486
2487 /*-------------------------------------------------------------------*
2488 *               claw_strt_conn_req                                   *
2489 *                                                                    *
2490 *--------------------------------------------------------------------*/
2491
2492 static int
2493 claw_strt_conn_req(struct net_device *dev )
2494 {
2495         int rc;
2496
2497         CLAW_DBF_TEXT(2, setup, "conn_req");
2498         rc=claw_snd_conn_req(dev, 1);
2499         return rc;
2500 }    /*   end of claw_strt_conn_req   */
2501
2502
2503
2504 /*-------------------------------------------------------------------*
2505  *   claw_stats                                                      *
2506  *-------------------------------------------------------------------*/
2507
2508 static struct
2509 net_device_stats *claw_stats(struct net_device *dev)
2510 {
2511         struct claw_privbk *privptr;
2512
2513         CLAW_DBF_TEXT(4, trace, "stats");
2514         privptr = dev->ml_priv;
2515         return &privptr->stats;
2516 }     /*   end of claw_stats   */
2517
2518
2519 /*-------------------------------------------------------------------*
2520 *       unpack_read                                                  *
2521 *                                                                    *
2522 *--------------------------------------------------------------------*/
2523 static void
2524 unpack_read(struct net_device *dev )
2525 {
2526         struct sk_buff *skb;
2527         struct claw_privbk *privptr;
2528         struct claw_env    *p_env;
2529         struct ccwbk    *p_this_ccw;
2530         struct ccwbk    *p_first_ccw;
2531         struct ccwbk    *p_last_ccw;
2532         struct clawph   *p_packh;
2533         void            *p_packd;
2534         struct clawctl  *p_ctlrec=NULL;
2535         struct device   *p_dev;
2536
2537         __u32   len_of_data;
2538         __u32   pack_off;
2539         __u8    link_num;
2540         __u8    mtc_this_frm=0;
2541         __u32   bytes_to_mov;
2542         int     i=0;
2543         int     p=0;
2544
2545         CLAW_DBF_TEXT(4, trace, "unpkread");
2546         p_first_ccw=NULL;
2547         p_last_ccw=NULL;
2548         p_packh=NULL;
2549         p_packd=NULL;
2550         privptr = dev->ml_priv;
2551
2552         p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2553         p_env = privptr->p_env;
2554         p_this_ccw=privptr->p_read_active_first;
2555         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2556                 pack_off = 0;
2557                 p = 0;
2558                 p_this_ccw->header.flag=CLAW_PENDING;
2559                 privptr->p_read_active_first=p_this_ccw->next;
2560                 p_this_ccw->next=NULL;
2561                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2562                 if ((p_env->packing == PACK_SEND) &&
2563                     (p_packh->len == 32)           &&
2564                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2565                         p_packh++;  /* peek past pack header */
2566                         p_ctlrec = (struct clawctl *)p_packh;
2567                         p_packh--;  /* un peek */
2568                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2569                             (p_ctlrec->command == CONNECTION_CONFIRM))
2570                                 p_env->packing = DO_PACKED;
2571                 }
2572                 if (p_env->packing == DO_PACKED)
2573                         link_num=p_packh->link_num;
2574                 else
2575                         link_num=p_this_ccw->header.opcode / 8;
2576                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2577                         mtc_this_frm=1;
2578                         if (p_this_ccw->header.length!=
2579                                 privptr->p_env->read_size ) {
2580                                 dev_warn(p_dev,
2581                                         "The communication peer of %s"
2582                                         " sent a faulty"
2583                                         " frame of length %02x\n",
2584                                         dev->name, p_this_ccw->header.length);
2585                         }
2586                 }
2587
2588                 if (privptr->mtc_skipping) {
2589                         /*
2590                         *   We're in the mode of skipping past a
2591                         *   multi-frame message
2592                         *   that we can't process for some reason or other.
2593                         *   The first frame without the More-To-Come flag is
2594                         *   the last frame of the skipped message.
2595                         */
2596                         /*  in case of More-To-Come not set in this frame */
2597                         if (mtc_this_frm==0) {
2598                                 privptr->mtc_skipping=0; /* Ok, the end */
2599                                 privptr->mtc_logical_link=-1;
2600                         }
2601                         goto NextFrame;
2602                 }
2603
2604                 if (link_num==0) {
2605                         claw_process_control(dev, p_this_ccw);
2606                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2607                         goto NextFrame;
2608                 }
2609 unpack_next:
2610                 if (p_env->packing == DO_PACKED) {
2611                         if (pack_off > p_env->read_size)
2612                                 goto NextFrame;
2613                         p_packd = p_this_ccw->p_buffer+pack_off;
2614                         p_packh = (struct clawph *) p_packd;
2615                         if ((p_packh->len == 0) || /* done with this frame? */
2616                             (p_packh->flag != 0))
2617                                 goto NextFrame;
2618                         bytes_to_mov = p_packh->len;
2619                         pack_off += bytes_to_mov+sizeof(struct clawph);
2620                         p++;
2621                 } else {
2622                         bytes_to_mov=p_this_ccw->header.length;
2623                 }
2624                 if (privptr->mtc_logical_link<0) {
2625
2626                 /*
2627                 *  if More-To-Come is set in this frame then we don't know
2628                 *  length of entire message, and hence have to allocate
2629                 *  large buffer   */
2630
2631                 /*      We are starting a new envelope  */
2632                 privptr->mtc_offset=0;
2633                         privptr->mtc_logical_link=link_num;
2634                 }
2635
2636                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2637                         /*      error     */
2638                         privptr->stats.rx_frame_errors++;
2639                         goto NextFrame;
2640                 }
2641                 if (p_env->packing == DO_PACKED) {
2642                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2643                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2644
2645                 } else  {
2646                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2647                                 p_this_ccw->p_buffer, bytes_to_mov);
2648                 }
2649                 if (mtc_this_frm==0) {
2650                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2651                         skb=dev_alloc_skb(len_of_data);
2652                         if (skb) {
2653                                 memcpy(skb_put(skb,len_of_data),
2654                                         privptr->p_mtc_envelope,
2655                                         len_of_data);
2656                                 skb->dev=dev;
2657                                 skb_reset_mac_header(skb);
2658                                 skb->protocol=htons(ETH_P_IP);
2659                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2660                                 privptr->stats.rx_packets++;
2661                                 privptr->stats.rx_bytes+=len_of_data;
2662                                 netif_rx(skb);
2663                         }
2664                         else {
2665                                 dev_info(p_dev, "Allocating a buffer for"
2666                                         " incoming data failed\n");
2667                                 privptr->stats.rx_dropped++;
2668                         }
2669                         privptr->mtc_offset=0;
2670                         privptr->mtc_logical_link=-1;
2671                 }
2672                 else {
2673                         privptr->mtc_offset+=bytes_to_mov;
2674                 }
2675                 if (p_env->packing == DO_PACKED)
2676                         goto unpack_next;
2677 NextFrame:
2678                 /*
2679                 *   Remove ThisCCWblock from active read queue, and add it
2680                 *   to queue of free blocks to be reused.
2681                 */
2682                 i++;
2683                 p_this_ccw->header.length=0xffff;
2684                 p_this_ccw->header.opcode=0xff;
2685                 /*
2686                 *       add this one to the free queue for later reuse
2687                 */
2688                 if (p_first_ccw==NULL) {
2689                         p_first_ccw = p_this_ccw;
2690                 }
2691                 else {
2692                         p_last_ccw->next = p_this_ccw;
2693                 }
2694                 p_last_ccw = p_this_ccw;
2695                 /*
2696                 *       chain to next block on active read queue
2697                 */
2698                 p_this_ccw = privptr->p_read_active_first;
2699                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2700         } /* end of while */
2701
2702         /*      check validity                  */
2703
2704         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2705         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2706         claw_strt_read(dev, LOCK_YES);
2707         return;
2708 }     /*  end of unpack_read   */
2709
2710 /*-------------------------------------------------------------------*
2711 *       claw_strt_read                                               *
2712 *                                                                    *
2713 *--------------------------------------------------------------------*/
2714 static void
2715 claw_strt_read (struct net_device *dev, int lock )
2716 {
2717         int        rc = 0;
2718         __u32      parm;
2719         unsigned long  saveflags = 0;
2720         struct claw_privbk *privptr = dev->ml_priv;
2721         struct ccwbk*p_ccwbk;
2722         struct chbk *p_ch;
2723         struct clawh *p_clawh;
2724         p_ch = &privptr->channel[READ_CHANNEL];
2725
2726         CLAW_DBF_TEXT(4, trace, "StRdNter");
2727         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2728         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2729
2730         if ((privptr->p_write_active_first!=NULL &&
2731              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2732             (privptr->p_read_active_first!=NULL &&
2733              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2734                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2735         }
2736         if (lock==LOCK_YES) {
2737                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2738         }
2739         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2740                 CLAW_DBF_TEXT(4, trace, "HotRead");
2741                 p_ccwbk=privptr->p_read_active_first;
2742                 parm = (unsigned long) p_ch;
2743                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2744                                        0xff, 0);
2745                 if (rc != 0) {
2746                         ccw_check_return_code(p_ch->cdev, rc);
2747                 }
2748         }
2749         else {
2750                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2751         }
2752
2753         if (lock==LOCK_YES) {
2754                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2755         }
2756         CLAW_DBF_TEXT(4, trace, "StRdExit");
2757         return;
2758 }       /*    end of claw_strt_read    */
2759
2760 /*-------------------------------------------------------------------*
2761 *       claw_strt_out_IO                                             *
2762 *                                                                    *
2763 *--------------------------------------------------------------------*/
2764
2765 static void
2766 claw_strt_out_IO( struct net_device *dev )
2767 {
2768         int                     rc = 0;
2769         unsigned long           parm;
2770         struct claw_privbk      *privptr;
2771         struct chbk             *p_ch;
2772         struct ccwbk    *p_first_ccw;
2773
2774         if (!dev) {
2775                 return;
2776         }
2777         privptr = (struct claw_privbk *)dev->ml_priv;
2778         p_ch = &privptr->channel[WRITE_CHANNEL];
2779
2780         CLAW_DBF_TEXT(4, trace, "strt_io");
2781         p_first_ccw=privptr->p_write_active_first;
2782
2783         if (p_ch->claw_state == CLAW_STOP)
2784                 return;
2785         if (p_first_ccw == NULL) {
2786                 return;
2787         }
2788         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2789                 parm = (unsigned long) p_ch;
2790                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2791                 rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2792                                       0xff, 0);
2793                 if (rc != 0) {
2794                         ccw_check_return_code(p_ch->cdev, rc);
2795                 }
2796         }
2797         dev->trans_start = jiffies;
2798         return;
2799 }       /*    end of claw_strt_out_IO    */
2800
2801 /*-------------------------------------------------------------------*
2802 *       Free write buffers                                           *
2803 *                                                                    *
2804 *--------------------------------------------------------------------*/
2805
2806 static void
2807 claw_free_wrt_buf( struct net_device *dev )
2808 {
2809
2810         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2811         struct ccwbk*p_this_ccw;
2812         struct ccwbk*p_next_ccw;
2813
2814         CLAW_DBF_TEXT(4, trace, "freewrtb");
2815         /*  scan the write queue to free any completed write packets   */
2816         p_this_ccw=privptr->p_write_active_first;
2817         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2818         {
2819                 p_next_ccw = p_this_ccw->next;
2820                 if (((p_next_ccw!=NULL) &&
2821                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2822                     ((p_this_ccw == privptr->p_write_active_last) &&
2823                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2824                         /* The next CCW is OK or this is  */
2825                         /* the last CCW...free it   @A1A  */
2826                         privptr->p_write_active_first=p_this_ccw->next;
2827                         p_this_ccw->header.flag=CLAW_PENDING;
2828                         p_this_ccw->next=privptr->p_write_free_chain;
2829                         privptr->p_write_free_chain=p_this_ccw;
2830                         ++privptr->write_free_count;
2831                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2832                         p_this_ccw=privptr->p_write_active_first;
2833                         privptr->stats.tx_packets++;
2834                 }
2835                 else {
2836                         break;
2837                 }
2838         }
2839         if (privptr->write_free_count!=0) {
2840                 claw_clearbit_busy(TB_NOBUFFER,dev);
2841         }
2842         /*   whole chain removed?   */
2843         if (privptr->p_write_active_first==NULL) {
2844                 privptr->p_write_active_last=NULL;
2845         }
2846         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2847         return;
2848 }
2849
2850 /*-------------------------------------------------------------------*
2851 *       claw free netdevice                                          *
2852 *                                                                    *
2853 *--------------------------------------------------------------------*/
2854 static void
2855 claw_free_netdevice(struct net_device * dev, int free_dev)
2856 {
2857         struct claw_privbk *privptr;
2858
2859         CLAW_DBF_TEXT(2, setup, "free_dev");
2860         if (!dev)
2861                 return;
2862         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2863         privptr = dev->ml_priv;
2864         if (dev->flags & IFF_RUNNING)
2865                 claw_release(dev);
2866         if (privptr) {
2867                 privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2868         }
2869         dev->ml_priv = NULL;
2870 #ifdef MODULE
2871         if (free_dev) {
2872                 free_netdev(dev);
2873         }
2874 #endif
2875         CLAW_DBF_TEXT(2, setup, "free_ok");
2876 }
2877
2878 /**
2879  * Claw init netdevice
2880  * Initialize everything of the net device except the name and the
2881  * channel structs.
2882  */
2883 static const struct net_device_ops claw_netdev_ops = {
2884         .ndo_open               = claw_open,
2885         .ndo_stop               = claw_release,
2886         .ndo_get_stats          = claw_stats,
2887         .ndo_start_xmit         = claw_tx,
2888         .ndo_change_mtu         = claw_change_mtu,
2889 };
2890
2891 static void
2892 claw_init_netdevice(struct net_device * dev)
2893 {
2894         CLAW_DBF_TEXT(2, setup, "init_dev");
2895         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2896         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2897         dev->hard_header_len = 0;
2898         dev->addr_len = 0;
2899         dev->type = ARPHRD_SLIP;
2900         dev->tx_queue_len = 1300;
2901         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2902         dev->netdev_ops = &claw_netdev_ops;
2903         CLAW_DBF_TEXT(2, setup, "initok");
2904         return;
2905 }
2906
2907 /**
2908  * Init a new channel in the privptr->channel[i].
2909  *
2910  * @param cdev  The ccw_device to be added.
2911  *
2912  * @return 0 on success, !0 on error.
2913  */
2914 static int
2915 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2916 {
2917         struct chbk *p_ch;
2918         struct ccw_dev_id dev_id;
2919
2920         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2921         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2922         p_ch = &privptr->channel[i];
2923         p_ch->cdev = cdev;
2924         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2925         ccw_device_get_id(cdev, &dev_id);
2926         p_ch->devno = dev_id.devno;
2927         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2928                 return -ENOMEM;
2929         }
2930         return 0;
2931 }
2932
2933
2934 /**
2935  *
2936  * Setup an interface.
2937  *
2938  * @param cgdev  Device to be setup.
2939  *
2940  * @returns 0 on success, !0 on failure.
2941  */
2942 static int
2943 claw_new_device(struct ccwgroup_device *cgdev)
2944 {
2945         struct claw_privbk *privptr;
2946         struct claw_env *p_env;
2947         struct net_device *dev;
2948         int ret;
2949         struct ccw_dev_id dev_id;
2950
2951         dev_info(&cgdev->dev, "add for %s\n",
2952                  dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2953         CLAW_DBF_TEXT(2, setup, "new_dev");
2954         privptr = dev_get_drvdata(&cgdev->dev);
2955         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2956         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2957         if (!privptr)
2958                 return -ENODEV;
2959         p_env = privptr->p_env;
2960         ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2961         p_env->devno[READ_CHANNEL] = dev_id.devno;
2962         ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2963         p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2964         ret = add_channel(cgdev->cdev[0],0,privptr);
2965         if (ret == 0)
2966                 ret = add_channel(cgdev->cdev[1],1,privptr);
2967         if (ret != 0) {
2968                 dev_warn(&cgdev->dev, "Creating a CLAW group device"
2969                         " failed with error code %d\n", ret);
2970                 goto out;
2971         }
2972         ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2973         if (ret != 0) {
2974                 dev_warn(&cgdev->dev,
2975                         "Setting the read subchannel online"
2976                         " failed with error code %d\n", ret);
2977                 goto out;
2978         }
2979         ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2980         if (ret != 0) {
2981                 dev_warn(&cgdev->dev,
2982                         "Setting the write subchannel online "
2983                         "failed with error code %d\n", ret);
2984                 goto out;
2985         }
2986         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2987         if (!dev) {
2988                 dev_warn(&cgdev->dev,
2989                         "Activating the CLAW device failed\n");
2990                 goto out;
2991         }
2992         dev->ml_priv = privptr;
2993         dev_set_drvdata(&cgdev->dev, privptr);
2994         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2995         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2996         /* sysfs magic */
2997         SET_NETDEV_DEV(dev, &cgdev->dev);
2998         if (register_netdev(dev) != 0) {
2999                 claw_free_netdevice(dev, 1);
3000                 CLAW_DBF_TEXT(2, trace, "regfail");
3001                 goto out;
3002         }
3003         dev->flags &=~IFF_RUNNING;
3004         if (privptr->buffs_alloc == 0) {
3005                 ret=init_ccw_bk(dev);
3006                 if (ret !=0) {
3007                         unregister_netdev(dev);
3008                         claw_free_netdevice(dev,1);
3009                         CLAW_DBF_TEXT(2, trace, "ccwmem");
3010                         goto out;
3011                 }
3012         }
3013         privptr->channel[READ_CHANNEL].ndev = dev;
3014         privptr->channel[WRITE_CHANNEL].ndev = dev;
3015         privptr->p_env->ndev = dev;
3016
3017         dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
3018                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
3019                 dev->name, p_env->read_size,
3020                 p_env->write_size, p_env->read_buffers,
3021                 p_env->write_buffers, p_env->devno[READ_CHANNEL],
3022                 p_env->devno[WRITE_CHANNEL]);
3023         dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
3024                 ":%.8s api_type: %.8s\n",
3025                 dev->name, p_env->host_name,
3026                 p_env->adapter_name , p_env->api_type);
3027         return 0;
3028 out:
3029         ccw_device_set_offline(cgdev->cdev[1]);
3030         ccw_device_set_offline(cgdev->cdev[0]);
3031         return -ENODEV;
3032 }
3033
3034 static void
3035 claw_purge_skb_queue(struct sk_buff_head *q)
3036 {
3037         struct sk_buff *skb;
3038
3039         CLAW_DBF_TEXT(4, trace, "purgque");
3040         while ((skb = skb_dequeue(q))) {
3041                 atomic_dec(&skb->users);
3042                 dev_kfree_skb_any(skb);
3043         }
3044 }
3045
3046 /**
3047  * Shutdown an interface.
3048  *
3049  * @param cgdev  Device to be shut down.
3050  *
3051  * @returns 0 on success, !0 on failure.
3052  */
3053 static int
3054 claw_shutdown_device(struct ccwgroup_device *cgdev)
3055 {
3056         struct claw_privbk *priv;
3057         struct net_device *ndev;
3058         int ret = 0;
3059
3060         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3061         priv = dev_get_drvdata(&cgdev->dev);
3062         if (!priv)
3063                 return -ENODEV;
3064         ndev = priv->channel[READ_CHANNEL].ndev;
3065         if (ndev) {
3066                 /* Close the device */
3067                 dev_info(&cgdev->dev, "%s: shutting down\n",
3068                         ndev->name);
3069                 if (ndev->flags & IFF_RUNNING)
3070                         ret = claw_release(ndev);
3071                 ndev->flags &=~IFF_RUNNING;
3072                 unregister_netdev(ndev);
3073                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3074                 claw_free_netdevice(ndev, 1);
3075                 priv->channel[READ_CHANNEL].ndev = NULL;
3076                 priv->channel[WRITE_CHANNEL].ndev = NULL;
3077                 priv->p_env->ndev = NULL;
3078         }
3079         ccw_device_set_offline(cgdev->cdev[1]);
3080         ccw_device_set_offline(cgdev->cdev[0]);
3081         return ret;
3082 }
3083
3084 static void
3085 claw_remove_device(struct ccwgroup_device *cgdev)
3086 {
3087         struct claw_privbk *priv;
3088
3089         BUG_ON(!cgdev);
3090         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3091         priv = dev_get_drvdata(&cgdev->dev);
3092         BUG_ON(!priv);
3093         dev_info(&cgdev->dev, " will be removed.\n");
3094         if (cgdev->state == CCWGROUP_ONLINE)
3095                 claw_shutdown_device(cgdev);
3096         claw_remove_files(&cgdev->dev);
3097         kfree(priv->p_mtc_envelope);
3098         priv->p_mtc_envelope=NULL;
3099         kfree(priv->p_env);
3100         priv->p_env=NULL;
3101         kfree(priv->channel[0].irb);
3102         priv->channel[0].irb=NULL;
3103         kfree(priv->channel[1].irb);
3104         priv->channel[1].irb=NULL;
3105         kfree(priv);
3106         dev_set_drvdata(&cgdev->dev, NULL);
3107         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3108         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3109         put_device(&cgdev->dev);
3110
3111         return;
3112 }
3113
3114
3115 /*
3116  * sysfs attributes
3117  */
3118 static ssize_t
3119 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3120 {
3121         struct claw_privbk *priv;
3122         struct claw_env *  p_env;
3123
3124         priv = dev_get_drvdata(dev);
3125         if (!priv)
3126                 return -ENODEV;
3127         p_env = priv->p_env;
3128         return sprintf(buf, "%s\n",p_env->host_name);
3129 }
3130
3131 static ssize_t
3132 claw_hname_write(struct device *dev, struct device_attribute *attr,
3133          const char *buf, size_t count)
3134 {
3135         struct claw_privbk *priv;
3136         struct claw_env *  p_env;
3137
3138         priv = dev_get_drvdata(dev);
3139         if (!priv)
3140                 return -ENODEV;
3141         p_env = priv->p_env;
3142         if (count > MAX_NAME_LEN+1)
3143                 return -EINVAL;
3144         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3145         strncpy(p_env->host_name,buf, count);
3146         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3147         p_env->host_name[MAX_NAME_LEN] = 0x00;
3148         CLAW_DBF_TEXT(2, setup, "HstnSet");
3149         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3150
3151         return count;
3152 }
3153
3154 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3155
3156 static ssize_t
3157 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3158 {
3159         struct claw_privbk *priv;
3160         struct claw_env *  p_env;
3161
3162         priv = dev_get_drvdata(dev);
3163         if (!priv)
3164                 return -ENODEV;
3165         p_env = priv->p_env;
3166         return sprintf(buf, "%s\n", p_env->adapter_name);
3167 }
3168
3169 static ssize_t
3170 claw_adname_write(struct device *dev, struct device_attribute *attr,
3171          const char *buf, size_t count)
3172 {
3173         struct claw_privbk *priv;
3174         struct claw_env *  p_env;
3175
3176         priv = dev_get_drvdata(dev);
3177         if (!priv)
3178                 return -ENODEV;
3179         p_env = priv->p_env;
3180         if (count > MAX_NAME_LEN+1)
3181                 return -EINVAL;
3182         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3183         strncpy(p_env->adapter_name,buf, count);
3184         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3185         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3186         CLAW_DBF_TEXT(2, setup, "AdnSet");
3187         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3188
3189         return count;
3190 }
3191
3192 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3193
3194 static ssize_t
3195 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3196 {
3197         struct claw_privbk *priv;
3198         struct claw_env *  p_env;
3199
3200         priv = dev_get_drvdata(dev);
3201         if (!priv)
3202                 return -ENODEV;
3203         p_env = priv->p_env;
3204         return sprintf(buf, "%s\n",
3205                        p_env->api_type);
3206 }
3207
3208 static ssize_t
3209 claw_apname_write(struct device *dev, struct device_attribute *attr,
3210         const char *buf, size_t count)
3211 {
3212         struct claw_privbk *priv;
3213         struct claw_env *  p_env;
3214
3215         priv = dev_get_drvdata(dev);
3216         if (!priv)
3217                 return -ENODEV;
3218         p_env = priv->p_env;
3219         if (count > MAX_NAME_LEN+1)
3220                 return -EINVAL;
3221         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3222         strncpy(p_env->api_type,buf, count);
3223         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3224         p_env->api_type[MAX_NAME_LEN] = 0x00;
3225         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3226                 p_env->read_size=DEF_PACK_BUFSIZE;
3227                 p_env->write_size=DEF_PACK_BUFSIZE;
3228                 p_env->packing=PACKING_ASK;
3229                 CLAW_DBF_TEXT(2, setup, "PACKING");
3230         }
3231         else {
3232                 p_env->packing=0;
3233                 p_env->read_size=CLAW_FRAME_SIZE;
3234                 p_env->write_size=CLAW_FRAME_SIZE;
3235                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3236         }
3237         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3238         return count;
3239 }
3240
3241 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3242
3243 static ssize_t
3244 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3245 {
3246         struct claw_privbk *priv;
3247         struct claw_env * p_env;
3248
3249         priv = dev_get_drvdata(dev);
3250         if (!priv)
3251                 return -ENODEV;
3252         p_env = priv->p_env;
3253         return sprintf(buf, "%d\n", p_env->write_buffers);
3254 }
3255
3256 static ssize_t
3257 claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3258         const char *buf, size_t count)
3259 {
3260         struct claw_privbk *priv;
3261         struct claw_env *  p_env;
3262         int nnn,max;
3263
3264         priv = dev_get_drvdata(dev);
3265         if (!priv)
3266                 return -ENODEV;
3267         p_env = priv->p_env;
3268         sscanf(buf, "%i", &nnn);
3269         if (p_env->packing) {
3270                 max = 64;
3271         }
3272         else {
3273                 max = 512;
3274         }
3275         if ((nnn > max ) || (nnn < 2))
3276                 return -EINVAL;
3277         p_env->write_buffers = nnn;
3278         CLAW_DBF_TEXT(2, setup, "Wbufset");
3279         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3280         return count;
3281 }
3282
3283 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3284
3285 static ssize_t
3286 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3287 {
3288         struct claw_privbk *priv;
3289         struct claw_env *  p_env;
3290
3291         priv = dev_get_drvdata(dev);
3292         if (!priv)
3293                 return -ENODEV;
3294         p_env = priv->p_env;
3295         return sprintf(buf, "%d\n", p_env->read_buffers);
3296 }
3297
3298 static ssize_t
3299 claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3300         const char *buf, size_t count)
3301 {
3302         struct claw_privbk *priv;
3303         struct claw_env *p_env;
3304         int nnn,max;
3305
3306         priv = dev_get_drvdata(dev);
3307         if (!priv)
3308                 return -ENODEV;
3309         p_env = priv->p_env;
3310         sscanf(buf, "%i", &nnn);
3311         if (p_env->packing) {
3312                 max = 64;
3313         }
3314         else {
3315                 max = 512;
3316         }
3317         if ((nnn > max ) || (nnn < 2))
3318                 return -EINVAL;
3319         p_env->read_buffers = nnn;
3320         CLAW_DBF_TEXT(2, setup, "Rbufset");
3321         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3322         return count;
3323 }
3324
3325 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3326
3327 static struct attribute *claw_attr[] = {
3328         &dev_attr_read_buffer.attr,
3329         &dev_attr_write_buffer.attr,
3330         &dev_attr_adapter_name.attr,
3331         &dev_attr_api_type.attr,
3332         &dev_attr_host_name.attr,
3333         NULL,
3334 };
3335
3336 static struct attribute_group claw_attr_group = {
3337         .attrs = claw_attr,
3338 };
3339
3340 static int
3341 claw_add_files(struct device *dev)
3342 {
3343         CLAW_DBF_TEXT(2, setup, "add_file");
3344         return sysfs_create_group(&dev->kobj, &claw_attr_group);
3345 }
3346
3347 static void
3348 claw_remove_files(struct device *dev)
3349 {
3350         CLAW_DBF_TEXT(2, setup, "rem_file");
3351         sysfs_remove_group(&dev->kobj, &claw_attr_group);
3352 }
3353
3354 /*--------------------------------------------------------------------*
3355 *    claw_init  and cleanup                                           *
3356 *---------------------------------------------------------------------*/
3357
3358 static void __exit
3359 claw_cleanup(void)
3360 {
3361         driver_remove_file(&claw_group_driver.driver,
3362                            &driver_attr_group);
3363         ccwgroup_driver_unregister(&claw_group_driver);
3364         ccw_driver_unregister(&claw_ccw_driver);
3365         root_device_unregister(claw_root_dev);
3366         claw_unregister_debug_facility();
3367         pr_info("Driver unloaded\n");
3368
3369 }
3370
3371 /**
3372  * Initialize module.
3373  * This is called just after the module is loaded.
3374  *
3375  * @return 0 on success, !0 on error.
3376  */
3377 static int __init
3378 claw_init(void)
3379 {
3380         int ret = 0;
3381
3382         pr_info("Loading %s\n", version);
3383         ret = claw_register_debug_facility();
3384         if (ret) {
3385                 pr_err("Registering with the S/390 debug feature"
3386                         " failed with error code %d\n", ret);
3387                 goto out_err;
3388         }
3389         CLAW_DBF_TEXT(2, setup, "init_mod");
3390         claw_root_dev = root_device_register("claw");
3391         ret = IS_ERR(claw_root_dev) ? PTR_ERR(claw_root_dev) : 0;
3392         if (ret)
3393                 goto register_err;
3394         ret = ccw_driver_register(&claw_ccw_driver);
3395         if (ret)
3396                 goto ccw_err;
3397         claw_group_driver.driver.groups = claw_group_attr_groups;
3398         ret = ccwgroup_driver_register(&claw_group_driver);
3399         if (ret)
3400                 goto ccwgroup_err;
3401         return 0;
3402
3403 ccwgroup_err:
3404         ccw_driver_unregister(&claw_ccw_driver);
3405 ccw_err:
3406         root_device_unregister(claw_root_dev);
3407 register_err:
3408         CLAW_DBF_TEXT(2, setup, "init_bad");
3409         claw_unregister_debug_facility();
3410 out_err:
3411         pr_err("Initializing the claw device driver failed\n");
3412         return ret;
3413 }
3414
3415 module_init(claw_init);
3416 module_exit(claw_cleanup);
3417
3418 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3419 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3420                         "Copyright 2000,2008 IBM Corporation\n");
3421 MODULE_LICENSE("GPL");