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   1 /*
   2  *  drivers/s390/net/claw.c
   3  *    ESCON CLAW network driver
   4  *
   5  *  Linux for zSeries version
   6  *    Copyright (C) 2002,2005 IBM Corporation
   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 #include <asm/ccwdev.h>
  64 #include <asm/ccwgroup.h>
  65 #include <asm/debug.h>
  66 #include <asm/idals.h>
  67 #include <asm/io.h>
  68 #include <linux/bitops.h>
  69 #include <linux/ctype.h>
  70 #include <linux/delay.h>
  71 #include <linux/errno.h>
  72 #include <linux/if_arp.h>
  73 #include <linux/init.h>
  74 #include <linux/interrupt.h>
  75 #include <linux/ip.h>
  76 #include <linux/kernel.h>
  77 #include <linux/module.h>
  78 #include <linux/netdevice.h>
  79 #include <linux/etherdevice.h>
  80 #include <linux/proc_fs.h>
  81 #include <linux/sched.h>
  82 #include <linux/signal.h>
  83 #include <linux/skbuff.h>
  84 #include <linux/slab.h>
  85 #include <linux/string.h>
  86 #include <linux/tcp.h>
  87 #include <linux/timer.h>
  88 #include <linux/types.h>
  89
  90 #include "cu3088.h"
  91 #include "claw.h"
  92
  93 /*
  94    CLAW uses the s390dbf file system  see claw_trace and claw_setup
  95 */
  96
  97
  98 static char debug_buffer[255];
  99 /**
 100  * Debug Facility Stuff
 101  */
 102 static debug_info_t *claw_dbf_setup;
 103 static debug_info_t *claw_dbf_trace;
 104
 105 /**
 106  *  CLAW Debug Facility functions
 107  */
 108 static void
 109 claw_unregister_debug_facility(void)
 110 {
 111         if (claw_dbf_setup)
 112                 debug_unregister(claw_dbf_setup);
 113         if (claw_dbf_trace)
 114                 debug_unregister(claw_dbf_trace);
 115 }
 116
 117 static int
 118 claw_register_debug_facility(void)
 119 {
 120         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
 121         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
 122         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
 123                 claw_unregister_debug_facility();
 124                 return -ENOMEM;
 125         }
 126         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
 127         debug_set_level(claw_dbf_setup, 2);
 128         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
 129         debug_set_level(claw_dbf_trace, 2);
 130         return 0;
 131 }
 132
 133 static inline void
 134 claw_set_busy(struct net_device *dev)
 135 {
 136  ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
 137  eieio();
 138 }
 139
 140 static inline void
 141 claw_clear_busy(struct net_device *dev)
 142 {
 143         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
 144         netif_wake_queue(dev);
 145         eieio();
 146 }
 147
 148 static inline int
 149 claw_check_busy(struct net_device *dev)
 150 {
 151         eieio();
 152         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
 153 }
 154
 155 static inline void
 156 claw_setbit_busy(int nr,struct net_device *dev)
 157 {
 158         netif_stop_queue(dev);
 159         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 160 }
 161
 162 static inline void
 163 claw_clearbit_busy(int nr,struct net_device *dev)
 164 {
 165         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 166         netif_wake_queue(dev);
 167 }
 168
 169 static inline int
 170 claw_test_and_setbit_busy(int nr,struct net_device *dev)
 171 {
 172         netif_stop_queue(dev);
 173         return test_and_set_bit(nr,
 174                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
 175 }
 176
 177
 178 /* Functions for the DEV methods */
 179
 180 static int claw_probe(struct ccwgroup_device *cgdev);
 181 static void claw_remove_device(struct ccwgroup_device *cgdev);
 182 static void claw_purge_skb_queue(struct sk_buff_head *q);
 183 static int claw_new_device(struct ccwgroup_device *cgdev);
 184 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
 185 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
 186 static int claw_change_mtu( struct net_device *dev, int new_mtu);
 187 static int claw_open(struct net_device *dev);
 188 static void claw_irq_handler(struct ccw_device *cdev,
 189         unsigned long intparm, struct irb *irb);
 190 static void claw_irq_tasklet ( unsigned long data );
 191 static int claw_release(struct net_device *dev);
 192 static void claw_write_retry ( struct chbk * p_ch );
 193 static void claw_write_next ( struct chbk * p_ch );
 194 static void claw_timer ( struct chbk * p_ch );
 195
 196 /* Functions */
 197 static int add_claw_reads(struct net_device *dev,
 198         struct ccwbk* p_first, struct ccwbk* p_last);
 199 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
 200 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
 201 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
 202 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
 203 static int init_ccw_bk(struct net_device *dev);
 204 static void probe_error( struct ccwgroup_device *cgdev);
 205 static struct net_device_stats *claw_stats(struct net_device *dev);
 206 static int pages_to_order_of_mag(int num_of_pages);
 207 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
 208 /* sysfs Functions */
 209 static ssize_t claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf);
 210 static ssize_t claw_hname_write(struct device *dev, struct device_attribute *attr,
 211         const char *buf, size_t count);
 212 static ssize_t claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf);
 213 static ssize_t claw_adname_write(struct device *dev, struct device_attribute *attr,
 214         const char *buf, size_t count);
 215 static ssize_t claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf);
 216 static ssize_t claw_apname_write(struct device *dev, struct device_attribute *attr,
 217         const char *buf, size_t count);
 218 static ssize_t claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf);
 219 static ssize_t claw_wbuff_write(struct device *dev, struct device_attribute *attr,
 220         const char *buf, size_t count);
 221 static ssize_t claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf);
 222 static ssize_t claw_rbuff_write(struct device *dev, struct device_attribute *attr,
 223         const char *buf, size_t count);
 224 static int claw_add_files(struct device *dev);
 225 static void claw_remove_files(struct device *dev);
 226
 227 /*   Functions for System Validate  */
 228 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
 229 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
 230        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
 231 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
 232 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
 233 static int claw_snd_sys_validate_rsp(struct net_device *dev,
 234         struct clawctl * p_ctl, __u32 return_code);
 235 static int claw_strt_conn_req(struct net_device *dev );
 236 static void claw_strt_read(struct net_device *dev, int lock);
 237 static void claw_strt_out_IO(struct net_device *dev);
 238 static void claw_free_wrt_buf(struct net_device *dev);
 239
 240 /* Functions for unpack reads   */
 241 static void unpack_read(struct net_device *dev);
 242
 243 /* ccwgroup table  */
 244
 245 static struct ccwgroup_driver claw_group_driver = {
 246         .owner       = THIS_MODULE,
 247         .name        = "claw",
 248         .max_slaves  = 2,
 249         .driver_id   = 0xC3D3C1E6,
 250         .probe       = claw_probe,
 251         .remove      = claw_remove_device,
 252         .set_online  = claw_new_device,
 253         .set_offline = claw_shutdown_device,
 254 };
 255
 256 /*
 257 *       Key functions
 258 */
 259
 260 /*----------------------------------------------------------------*
 261  *   claw_probe                                                   *
 262  *      this function is called for each CLAW device.             *
 263  *----------------------------------------------------------------*/
 264 static int
 265 claw_probe(struct ccwgroup_device *cgdev)
 266 {
 267         int             rc;
 268         struct claw_privbk *privptr=NULL;
 269
 270         CLAW_DBF_TEXT(2, setup, "probe");
 271         if (!get_device(&cgdev->dev))
 272                 return -ENODEV;
 273         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
 274         cgdev->dev.driver_data = privptr;
 275         if (privptr == NULL) {
 276                 probe_error(cgdev);
 277                 put_device(&cgdev->dev);
 278                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 279                 return -ENOMEM;
 280         }
 281         privptr->p_mtc_envelope= kzalloc( MAX_ENVELOPE_SIZE, GFP_KERNEL);
 282         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
 283         if ((privptr->p_mtc_envelope==NULL) || (privptr->p_env==NULL)) {
 284                 probe_error(cgdev);
 285                 put_device(&cgdev->dev);
 286                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 287                 return -ENOMEM;
 288         }
 289         memcpy(privptr->p_env->adapter_name,WS_NAME_NOT_DEF,8);
 290         memcpy(privptr->p_env->host_name,WS_NAME_NOT_DEF,8);
 291         memcpy(privptr->p_env->api_type,WS_NAME_NOT_DEF,8);
 292         privptr->p_env->packing = 0;
 293         privptr->p_env->write_buffers = 5;
 294         privptr->p_env->read_buffers = 5;
 295         privptr->p_env->read_size = CLAW_FRAME_SIZE;
 296         privptr->p_env->write_size = CLAW_FRAME_SIZE;
 297         rc = claw_add_files(&cgdev->dev);
 298         if (rc) {
 299                 probe_error(cgdev);
 300                 put_device(&cgdev->dev);
 301                 printk(KERN_WARNING "add_files failed %s %s Exit Line %d \n",
 302                         dev_name(&cgdev->cdev[0]->dev), __func__, __LINE__);
 303                 CLAW_DBF_TEXT_(2, setup, "probex%d", rc);
 304                 return rc;
 305         }
 306         privptr->p_env->p_priv = privptr;
 307         cgdev->cdev[0]->handler = claw_irq_handler;
 308         cgdev->cdev[1]->handler = claw_irq_handler;
 309         CLAW_DBF_TEXT(2, setup, "prbext 0");
 310
 311         return 0;
 312 }  /*  end of claw_probe       */
 313
 314 /*-------------------------------------------------------------------*
 315  *   claw_tx                                                         *
 316  *-------------------------------------------------------------------*/
 317
 318 static int
 319 claw_tx(struct sk_buff *skb, struct net_device *dev)
 320 {
 321         int             rc;
 322         struct claw_privbk *privptr = dev->ml_priv;
 323         unsigned long saveflags;
 324         struct chbk *p_ch;
 325
 326         CLAW_DBF_TEXT(4, trace, "claw_tx");
 327         p_ch=&privptr->channel[WRITE];
 328         if (skb == NULL) {
 329                 privptr->stats.tx_dropped++;
 330                 privptr->stats.tx_errors++;
 331                 CLAW_DBF_TEXT_(2, trace, "clawtx%d", -EIO);
 332                 return -EIO;
 333         }
 334         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
 335         rc=claw_hw_tx( skb, dev, 1 );
 336         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
 337         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
 338         return rc;
 339 }   /*  end of claw_tx */
 340
 341 /*------------------------------------------------------------------*
 342  *  pack the collect queue into an skb and return it                *
 343  *   If not packing just return the top skb from the queue          *
 344  *------------------------------------------------------------------*/
 345
 346 static struct sk_buff *
 347 claw_pack_skb(struct claw_privbk *privptr)
 348 {
 349         struct sk_buff *new_skb,*held_skb;
 350         struct chbk *p_ch = &privptr->channel[WRITE];
 351         struct claw_env  *p_env = privptr->p_env;
 352         int     pkt_cnt,pk_ind,so_far;
 353
 354         new_skb = NULL;         /* assume no dice */
 355         pkt_cnt = 0;
 356         CLAW_DBF_TEXT(4, trace, "PackSKBe");
 357         if (!skb_queue_empty(&p_ch->collect_queue)) {
 358         /* some data */
 359                 held_skb = skb_dequeue(&p_ch->collect_queue);
 360                 if (held_skb)
 361                         dev_kfree_skb_any(held_skb);
 362                 else
 363                         return NULL;
 364                 if (p_env->packing != DO_PACKED)
 365                         return held_skb;
 366                 /* get a new SKB we will pack at least one */
 367                 new_skb = dev_alloc_skb(p_env->write_size);
 368                 if (new_skb == NULL) {
 369                         atomic_inc(&held_skb->users);
 370                         skb_queue_head(&p_ch->collect_queue,held_skb);
 371                         return NULL;
 372                 }
 373                 /* we have packed packet and a place to put it  */
 374                 pk_ind = 1;
 375                 so_far = 0;
 376                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 377                 while ((pk_ind) && (held_skb != NULL)) {
 378                         if (held_skb->len+so_far <= p_env->write_size-8) {
 379                                 memcpy(skb_put(new_skb,held_skb->len),
 380                                         held_skb->data,held_skb->len);
 381                                 privptr->stats.tx_packets++;
 382                                 so_far += held_skb->len;
 383                                 pkt_cnt++;
 384                                 dev_kfree_skb_any(held_skb);
 385                                 held_skb = skb_dequeue(&p_ch->collect_queue);
 386                                 if (held_skb)
 387                                         atomic_dec(&held_skb->users);
 388                         } else {
 389                                 pk_ind = 0;
 390                                 atomic_inc(&held_skb->users);
 391                                 skb_queue_head(&p_ch->collect_queue,held_skb);
 392                         }
 393                 }
 394         }
 395         CLAW_DBF_TEXT(4, trace, "PackSKBx");
 396         return new_skb;
 397 }
 398
 399 /*-------------------------------------------------------------------*
 400  *   claw_change_mtu                                                 *
 401  *                                                                   *
 402  *-------------------------------------------------------------------*/
 403
 404 static int
 405 claw_change_mtu(struct net_device *dev, int new_mtu)
 406 {
 407         struct claw_privbk *privptr = dev->ml_priv;
 408         int buff_size;
 409         CLAW_DBF_TEXT(4, trace, "setmtu");
 410         buff_size = privptr->p_env->write_size;
 411         if ((new_mtu < 60) || (new_mtu > buff_size)) {
 412                 return -EINVAL;
 413         }
 414         dev->mtu = new_mtu;
 415         return 0;
 416 }  /*   end of claw_change_mtu */
 417
 418
 419 /*-------------------------------------------------------------------*
 420  *   claw_open                                                       *
 421  *                                                                   *
 422  *-------------------------------------------------------------------*/
 423 static int
 424 claw_open(struct net_device *dev)
 425 {
 426
 427         int     rc;
 428         int     i;
 429         unsigned long       saveflags=0;
 430         unsigned long       parm;
 431         struct claw_privbk  *privptr;
 432         DECLARE_WAITQUEUE(wait, current);
 433         struct timer_list  timer;
 434         struct ccwbk *p_buf;
 435
 436         CLAW_DBF_TEXT(4, trace, "open");
 437         privptr = (struct claw_privbk *)dev->ml_priv;
 438         /*   allocate and initialize CCW blocks */
 439         if (privptr->buffs_alloc == 0) {
 440                 rc=init_ccw_bk(dev);
 441                 if (rc) {
 442                         CLAW_DBF_TEXT(2, trace, "openmem");
 443                         return -ENOMEM;
 444                 }
 445         }
 446         privptr->system_validate_comp=0;
 447         privptr->release_pend=0;
 448         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 449                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 450                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 451                 privptr->p_env->packing=PACKING_ASK;
 452         } else {
 453                 privptr->p_env->packing=0;
 454                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
 455                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
 456         }
 457         claw_set_busy(dev);
 458         tasklet_init(&privptr->channel[READ].tasklet, claw_irq_tasklet,
 459                 (unsigned long) &privptr->channel[READ]);
 460         for ( i = 0; i < 2;  i++) {
 461                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 462                 init_waitqueue_head(&privptr->channel[i].wait);
 463                 /* skb_queue_head_init(&p_ch->io_queue); */
 464                 if (i == WRITE)
 465                         skb_queue_head_init(
 466                                 &privptr->channel[WRITE].collect_queue);
 467                 privptr->channel[i].flag_a = 0;
 468                 privptr->channel[i].IO_active = 0;
 469                 privptr->channel[i].flag  &= ~CLAW_TIMER;
 470                 init_timer(&timer);
 471                 timer.function = (void *)claw_timer;
 472                 timer.data = (unsigned long)(&privptr->channel[i]);
 473                 timer.expires = jiffies + 15*HZ;
 474                 add_timer(&timer);
 475                 spin_lock_irqsave(get_ccwdev_lock(
 476                         privptr->channel[i].cdev), saveflags);
 477                 parm = (unsigned long) &privptr->channel[i];
 478                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 479                 rc = 0;
 480                 add_wait_queue(&privptr->channel[i].wait, &wait);
 481                 rc = ccw_device_halt(
 482                         (struct ccw_device *)privptr->channel[i].cdev,parm);
 483                 set_current_state(TASK_INTERRUPTIBLE);
 484                 spin_unlock_irqrestore(
 485                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 486                 schedule();
 487                 set_current_state(TASK_RUNNING);
 488                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 489                 if(rc != 0)
 490                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 491                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 492                         del_timer(&timer);
 493         }
 494         if ((((privptr->channel[READ].last_dstat |
 495                 privptr->channel[WRITE].last_dstat) &
 496            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 497            (((privptr->channel[READ].flag |
 498                 privptr->channel[WRITE].flag) & CLAW_TIMER) != 0x00)) {
 499                 printk(KERN_INFO "%s: remote side is not ready\n", dev->name);
 500                 CLAW_DBF_TEXT(2, trace, "notrdy");
 501
 502                 for ( i = 0; i < 2;  i++) {
 503                         spin_lock_irqsave(
 504                                 get_ccwdev_lock(privptr->channel[i].cdev),
 505                                 saveflags);
 506                         parm = (unsigned long) &privptr->channel[i];
 507                         privptr->channel[i].claw_state = CLAW_STOP;
 508                         rc = ccw_device_halt(
 509                                 (struct ccw_device *)&privptr->channel[i].cdev,
 510                                 parm);
 511                         spin_unlock_irqrestore(
 512                                 get_ccwdev_lock(privptr->channel[i].cdev),
 513                                 saveflags);
 514                         if (rc != 0) {
 515                                 ccw_check_return_code(
 516                                         privptr->channel[i].cdev, rc);
 517                         }
 518                 }
 519                 free_pages((unsigned long)privptr->p_buff_ccw,
 520                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 521                 if (privptr->p_env->read_size < PAGE_SIZE) {
 522                         free_pages((unsigned long)privptr->p_buff_read,
 523                                (int)pages_to_order_of_mag(
 524                                         privptr->p_buff_read_num));
 525                 }
 526                 else {
 527                         p_buf=privptr->p_read_active_first;
 528                         while (p_buf!=NULL) {
 529                                 free_pages((unsigned long)p_buf->p_buffer,
 530                                       (int)pages_to_order_of_mag(
 531                                         privptr->p_buff_pages_perread ));
 532                                 p_buf=p_buf->next;
 533                         }
 534                 }
 535                 if (privptr->p_env->write_size < PAGE_SIZE ) {
 536                         free_pages((unsigned long)privptr->p_buff_write,
 537                              (int)pages_to_order_of_mag(
 538                                 privptr->p_buff_write_num));
 539                 }
 540                 else {
 541                         p_buf=privptr->p_write_active_first;
 542                         while (p_buf!=NULL) {
 543                                 free_pages((unsigned long)p_buf->p_buffer,
 544                                      (int)pages_to_order_of_mag(
 545                                         privptr->p_buff_pages_perwrite ));
 546                                 p_buf=p_buf->next;
 547                         }
 548                 }
 549                 privptr->buffs_alloc = 0;
 550                 privptr->channel[READ].flag= 0x00;
 551                 privptr->channel[WRITE].flag = 0x00;
 552                 privptr->p_buff_ccw=NULL;
 553                 privptr->p_buff_read=NULL;
 554                 privptr->p_buff_write=NULL;
 555                 claw_clear_busy(dev);
 556                 CLAW_DBF_TEXT(2, trace, "open EIO");
 557                 return -EIO;
 558         }
 559
 560         /*   Send SystemValidate command */
 561
 562         claw_clear_busy(dev);
 563         CLAW_DBF_TEXT(4, trace, "openok");
 564         return 0;
 565 }    /*     end of claw_open    */
 566
 567 /*-------------------------------------------------------------------*
 568 *                                                                    *
 569 *       claw_irq_handler                                             *
 570 *                                                                    *
 571 *--------------------------------------------------------------------*/
 572 static void
 573 claw_irq_handler(struct ccw_device *cdev,
 574         unsigned long intparm, struct irb *irb)
 575 {
 576         struct chbk *p_ch = NULL;
 577         struct claw_privbk *privptr = NULL;
 578         struct net_device *dev = NULL;
 579         struct claw_env  *p_env;
 580         struct chbk *p_ch_r=NULL;
 581
 582         CLAW_DBF_TEXT(4, trace, "clawirq");
 583         /* Bypass all 'unsolicited interrupts' */
 584         if (!cdev->dev.driver_data) {
 585                 printk(KERN_WARNING "claw: unsolicited interrupt for device:"
 586                         "%s received c-%02x d-%02x\n",
 587                        dev_name(&cdev->dev), irb->scsw.cmd.cstat,
 588                        irb->scsw.cmd.dstat);
 589                 CLAW_DBF_TEXT(2, trace, "badirq");
 590                 return;
 591         }
 592         privptr = (struct claw_privbk *)cdev->dev.driver_data;
 593
 594         /* Try to extract channel from driver data. */
 595         if (privptr->channel[READ].cdev == cdev)
 596                 p_ch = &privptr->channel[READ];
 597         else if (privptr->channel[WRITE].cdev == cdev)
 598                 p_ch = &privptr->channel[WRITE];
 599         else {
 600                 printk(KERN_WARNING "claw: Can't determine channel for "
 601                         "interrupt, device %s\n", dev_name(&cdev->dev));
 602                 CLAW_DBF_TEXT(2, trace, "badchan");
 603                 return;
 604         }
 605         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 606
 607         dev = (struct net_device *) (p_ch->ndev);
 608         p_env=privptr->p_env;
 609
 610         /* Copy interruption response block. */
 611         memcpy(p_ch->irb, irb, sizeof(struct irb));
 612
 613         /* Check for good subchannel return code, otherwise info message */
 614         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 615                 printk(KERN_INFO "%s: subchannel check for device: %04x -"
 616                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 617                         dev->name, p_ch->devno,
 618                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 619                         irb->scsw.cmd.cpa);
 620                 CLAW_DBF_TEXT(2, trace, "chanchk");
 621                 /* return; */
 622         }
 623
 624         /* Check the reason-code of a unit check */
 625         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 626                 ccw_check_unit_check(p_ch, irb->ecw[0]);
 627
 628         /* State machine to bring the connection up, down and to restart */
 629         p_ch->last_dstat = irb->scsw.cmd.dstat;
 630
 631         switch (p_ch->claw_state) {
 632         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 633                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 634                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 635                 (p_ch->irb->scsw.cmd.stctl ==
 636                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 637                         return;
 638                 wake_up(&p_ch->wait);   /* wake up claw_release */
 639                 CLAW_DBF_TEXT(4, trace, "stop");
 640                 return;
 641         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 642                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 643                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 644                 (p_ch->irb->scsw.cmd.stctl ==
 645                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 646                         CLAW_DBF_TEXT(4, trace, "haltio");
 647                         return;
 648                 }
 649                 if (p_ch->flag == CLAW_READ) {
 650                         p_ch->claw_state = CLAW_START_READ;
 651                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 652                 } else if (p_ch->flag == CLAW_WRITE) {
 653                         p_ch->claw_state = CLAW_START_WRITE;
 654                         /*      send SYSTEM_VALIDATE                    */
 655                         claw_strt_read(dev, LOCK_NO);
 656                         claw_send_control(dev,
 657                                 SYSTEM_VALIDATE_REQUEST,
 658                                 0, 0, 0,
 659                                 p_env->host_name,
 660                                 p_env->adapter_name);
 661                 } else {
 662                         printk(KERN_WARNING "claw: unsolicited "
 663                                 "interrupt for device:"
 664                                 "%s received c-%02x d-%02x\n",
 665                                 dev_name(&cdev->dev),
 666                                 irb->scsw.cmd.cstat,
 667                                 irb->scsw.cmd.dstat);
 668                         return;
 669                         }
 670                 CLAW_DBF_TEXT(4, trace, "haltio");
 671                 return;
 672         case CLAW_START_READ:
 673                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 674                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 675                         clear_bit(0, (void *)&p_ch->IO_active);
 676                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 677                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 678                             (p_ch->irb->ecw[0])        == 0) {
 679                                 privptr->stats.rx_errors++;
 680                                 printk(KERN_INFO "%s: Restart is "
 681                                         "required after remote "
 682                                         "side recovers \n",
 683                                         dev->name);
 684                         }
 685                         CLAW_DBF_TEXT(4, trace, "notrdy");
 686                         return;
 687                 }
 688                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 689                         (p_ch->irb->scsw.cmd.dstat == 0)) {
 690                         if (test_and_set_bit(CLAW_BH_ACTIVE,
 691                                 (void *)&p_ch->flag_a) == 0)
 692                                 tasklet_schedule(&p_ch->tasklet);
 693                         else
 694                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
 695                         CLAW_DBF_TEXT(4, trace, "PCI_read");
 696                         return;
 697                 }
 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                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
 703                         return;
 704                 }
 705                 clear_bit(0, (void *)&p_ch->IO_active);
 706                 claw_clearbit_busy(TB_RETRY, dev);
 707                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 708                         (void *)&p_ch->flag_a) == 0)
 709                         tasklet_schedule(&p_ch->tasklet);
 710                 else
 711                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
 712                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 713                 return;
 714         case CLAW_START_WRITE:
 715                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 716                         printk(KERN_INFO "%s: Unit Check Occured in "
 717                                 "write channel\n", dev->name);
 718                         clear_bit(0, (void *)&p_ch->IO_active);
 719                         if (p_ch->irb->ecw[0] & 0x80) {
 720                                 printk(KERN_INFO "%s: Resetting Event "
 721                                         "occurred:\n", dev->name);
 722                                 init_timer(&p_ch->timer);
 723                                 p_ch->timer.function =
 724                                         (void *)claw_write_retry;
 725                                 p_ch->timer.data = (unsigned long)p_ch;
 726                                 p_ch->timer.expires = jiffies + 10*HZ;
 727                                 add_timer(&p_ch->timer);
 728                                 printk(KERN_INFO "%s: write connection "
 729                                         "restarting\n", dev->name);
 730                         }
 731                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 732                         return;
 733                 }
 734                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 735                         clear_bit(0, (void *)&p_ch->IO_active);
 736                         printk(KERN_INFO "%s: Unit Exception "
 737                                "Occured in write channel\n",
 738                                dev->name);
 739                 }
 740                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 741                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 742                 (p_ch->irb->scsw.cmd.stctl ==
 743                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 744                         CLAW_DBF_TEXT(4, trace, "writeUE");
 745                         return;
 746                 }
 747                 clear_bit(0, (void *)&p_ch->IO_active);
 748                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 749                         claw_write_next(p_ch);
 750                         claw_clearbit_busy(TB_TX, dev);
 751                         claw_clear_busy(dev);
 752                 }
 753                 p_ch_r = (struct chbk *)&privptr->channel[READ];
 754                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 755                         (void *)&p_ch_r->flag_a) == 0)
 756                         tasklet_schedule(&p_ch_r->tasklet);
 757                 CLAW_DBF_TEXT(4, trace, "StWtExit");
 758                 return;
 759         default:
 760                 printk(KERN_WARNING "%s: wrong selection code - irq "
 761                         "state=%d\n", dev->name, p_ch->claw_state);
 762                 CLAW_DBF_TEXT(2, trace, "badIRQ");
 763                 return;
 764         }
 765
 766 }       /*   end of claw_irq_handler    */
 767
 768
 769 /*-------------------------------------------------------------------*
 770 *       claw_irq_tasklet                                             *
 771 *                                                                    *
 772 *--------------------------------------------------------------------*/
 773 static void
 774 claw_irq_tasklet ( unsigned long data )
 775 {
 776         struct chbk * p_ch;
 777         struct net_device  *dev;
 778         struct claw_privbk *       privptr;
 779
 780         p_ch = (struct chbk *) data;
 781         dev = (struct net_device *)p_ch->ndev;
 782         CLAW_DBF_TEXT(4, trace, "IRQtask");
 783         privptr = (struct claw_privbk *)dev->ml_priv;
 784         unpack_read(dev);
 785         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 786         CLAW_DBF_TEXT(4, trace, "TskletXt");
 787         return;
 788 }       /*    end of claw_irq_bh    */
 789
 790 /*-------------------------------------------------------------------*
 791 *       claw_release                                                 *
 792 *                                                                    *
 793 *--------------------------------------------------------------------*/
 794 static int
 795 claw_release(struct net_device *dev)
 796 {
 797         int                rc;
 798         int                i;
 799         unsigned long      saveflags;
 800         unsigned long      parm;
 801         struct claw_privbk *privptr;
 802         DECLARE_WAITQUEUE(wait, current);
 803         struct ccwbk*             p_this_ccw;
 804         struct ccwbk*             p_buf;
 805
 806         if (!dev)
 807                 return 0;
 808         privptr = (struct claw_privbk *)dev->ml_priv;
 809         if (!privptr)
 810                 return 0;
 811         CLAW_DBF_TEXT(4, trace, "release");
 812         privptr->release_pend=1;
 813         claw_setbit_busy(TB_STOP,dev);
 814         for ( i = 1; i >=0 ;  i--) {
 815                 spin_lock_irqsave(
 816                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 817              /*   del_timer(&privptr->channel[READ].timer);  */
 818                 privptr->channel[i].claw_state = CLAW_STOP;
 819                 privptr->channel[i].IO_active = 0;
 820                 parm = (unsigned long) &privptr->channel[i];
 821                 if (i == WRITE)
 822                         claw_purge_skb_queue(
 823                                 &privptr->channel[WRITE].collect_queue);
 824                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 825                 if (privptr->system_validate_comp==0x00)  /* never opened? */
 826                    init_waitqueue_head(&privptr->channel[i].wait);
 827                 add_wait_queue(&privptr->channel[i].wait, &wait);
 828                 set_current_state(TASK_INTERRUPTIBLE);
 829                 spin_unlock_irqrestore(
 830                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 831                 schedule();
 832                 set_current_state(TASK_RUNNING);
 833                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 834                 if (rc != 0) {
 835                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 836                 }
 837         }
 838         if (privptr->pk_skb != NULL) {
 839                 dev_kfree_skb_any(privptr->pk_skb);
 840                 privptr->pk_skb = NULL;
 841         }
 842         if(privptr->buffs_alloc != 1) {
 843                 CLAW_DBF_TEXT(4, trace, "none2fre");
 844                 return 0;
 845         }
 846         CLAW_DBF_TEXT(4, trace, "freebufs");
 847         if (privptr->p_buff_ccw != NULL) {
 848                 free_pages((unsigned long)privptr->p_buff_ccw,
 849                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 850         }
 851         CLAW_DBF_TEXT(4, trace, "freeread");
 852         if (privptr->p_env->read_size < PAGE_SIZE) {
 853             if (privptr->p_buff_read != NULL) {
 854                 free_pages((unsigned long)privptr->p_buff_read,
 855                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 856                 }
 857         }
 858         else {
 859                 p_buf=privptr->p_read_active_first;
 860                 while (p_buf!=NULL) {
 861                         free_pages((unsigned long)p_buf->p_buffer,
 862                              (int)pages_to_order_of_mag(
 863                                 privptr->p_buff_pages_perread ));
 864                         p_buf=p_buf->next;
 865                 }
 866         }
 867          CLAW_DBF_TEXT(4, trace, "freewrit");
 868         if (privptr->p_env->write_size < PAGE_SIZE ) {
 869                 free_pages((unsigned long)privptr->p_buff_write,
 870                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 871         }
 872         else {
 873                 p_buf=privptr->p_write_active_first;
 874                 while (p_buf!=NULL) {
 875                         free_pages((unsigned long)p_buf->p_buffer,
 876                               (int)pages_to_order_of_mag(
 877                               privptr->p_buff_pages_perwrite ));
 878                         p_buf=p_buf->next;
 879                 }
 880         }
 881          CLAW_DBF_TEXT(4, trace, "clearptr");
 882         privptr->buffs_alloc = 0;
 883         privptr->p_buff_ccw=NULL;
 884         privptr->p_buff_read=NULL;
 885         privptr->p_buff_write=NULL;
 886         privptr->system_validate_comp=0;
 887         privptr->release_pend=0;
 888         /*      Remove any writes that were pending and reset all reads   */
 889         p_this_ccw=privptr->p_read_active_first;
 890         while (p_this_ccw!=NULL) {
 891                 p_this_ccw->header.length=0xffff;
 892                 p_this_ccw->header.opcode=0xff;
 893                 p_this_ccw->header.flag=0x00;
 894                 p_this_ccw=p_this_ccw->next;
 895         }
 896
 897         while (privptr->p_write_active_first!=NULL) {
 898                 p_this_ccw=privptr->p_write_active_first;
 899                 p_this_ccw->header.flag=CLAW_PENDING;
 900                 privptr->p_write_active_first=p_this_ccw->next;
 901                 p_this_ccw->next=privptr->p_write_free_chain;
 902                 privptr->p_write_free_chain=p_this_ccw;
 903                 ++privptr->write_free_count;
 904         }
 905         privptr->p_write_active_last=NULL;
 906         privptr->mtc_logical_link = -1;
 907         privptr->mtc_skipping = 1;
 908         privptr->mtc_offset=0;
 909
 910         if (((privptr->channel[READ].last_dstat |
 911                 privptr->channel[WRITE].last_dstat) &
 912                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 913                 printk(KERN_WARNING "%s: channel problems during close - "
 914                         "read: %02x -  write: %02x\n",
 915                 dev->name,
 916                 privptr->channel[READ].last_dstat,
 917                 privptr->channel[WRITE].last_dstat);
 918                  CLAW_DBF_TEXT(2, trace, "badclose");
 919         }
 920         CLAW_DBF_TEXT(4, trace, "rlsexit");
 921         return 0;
 922 }      /* end of claw_release     */
 923
 924 /*-------------------------------------------------------------------*
 925 *       claw_write_retry                                             *
 926 *                                                                    *
 927 *--------------------------------------------------------------------*/
 928
 929 static void
 930 claw_write_retry ( struct chbk *p_ch )
 931 {
 932
 933         struct net_device  *dev=p_ch->ndev;
 934
 935         CLAW_DBF_TEXT(4, trace, "w_retry");
 936         if (p_ch->claw_state == CLAW_STOP) {
 937                 return;
 938         }
 939         claw_strt_out_IO( dev );
 940         CLAW_DBF_TEXT(4, trace, "rtry_xit");
 941         return;
 942 }      /* end of claw_write_retry      */
 943
 944
 945 /*-------------------------------------------------------------------*
 946 *       claw_write_next                                              *
 947 *                                                                    *
 948 *--------------------------------------------------------------------*/
 949
 950 static void
 951 claw_write_next ( struct chbk * p_ch )
 952 {
 953
 954         struct net_device  *dev;
 955         struct claw_privbk *privptr=NULL;
 956         struct sk_buff *pk_skb;
 957         int     rc;
 958
 959         CLAW_DBF_TEXT(4, trace, "claw_wrt");
 960         if (p_ch->claw_state == CLAW_STOP)
 961                 return;
 962         dev = (struct net_device *) p_ch->ndev;
 963         privptr = (struct claw_privbk *) dev->ml_priv;
 964         claw_free_wrt_buf( dev );
 965         if ((privptr->write_free_count > 0) &&
 966             !skb_queue_empty(&p_ch->collect_queue)) {
 967                 pk_skb = claw_pack_skb(privptr);
 968                 while (pk_skb != NULL) {
 969                         rc = claw_hw_tx( pk_skb, dev,1);
 970                         if (privptr->write_free_count > 0) {
 971                                 pk_skb = claw_pack_skb(privptr);
 972                         } else
 973                                 pk_skb = NULL;
 974                 }
 975         }
 976         if (privptr->p_write_active_first!=NULL) {
 977                 claw_strt_out_IO(dev);
 978         }
 979         return;
 980 }      /* end of claw_write_next      */
 981
 982 /*-------------------------------------------------------------------*
 983 *                                                                    *
 984 *       claw_timer                                                   *
 985 *--------------------------------------------------------------------*/
 986
 987 static void
 988 claw_timer ( struct chbk * p_ch )
 989 {
 990         CLAW_DBF_TEXT(4, trace, "timer");
 991         p_ch->flag |= CLAW_TIMER;
 992         wake_up(&p_ch->wait);
 993         return;
 994 }      /* end of claw_timer  */
 995
 996 /*
 997 *
 998 *       functions
 999 */
1000
1001
1002 /*-------------------------------------------------------------------*
1003 *                                                                    *
1004 *     pages_to_order_of_mag                                          *
1005 *                                                                    *
1006 *    takes a number of pages from 1 to 512 and returns the           *
1007 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1008 *    of magnitude get_free_pages() has an upper order of 9           *
1009 *--------------------------------------------------------------------*/
1010
1011 static int
1012 pages_to_order_of_mag(int num_of_pages)
1013 {
1014         int     order_of_mag=1;         /* assume 2 pages */
1015         int     nump=2;
1016
1017         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1018         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1019         /* 512 pages = 2Meg on 4k page systems */
1020         if (num_of_pages >= 512) {return 9; }
1021         /* we have two or more pages order is at least 1 */
1022         for (nump=2 ;nump <= 512;nump*=2) {
1023           if (num_of_pages <= nump)
1024                   break;
1025           order_of_mag +=1;
1026         }
1027         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1028         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1029         return order_of_mag;
1030 }
1031
1032 /*-------------------------------------------------------------------*
1033 *                                                                    *
1034 *     add_claw_reads                                                 *
1035 *                                                                    *
1036 *--------------------------------------------------------------------*/
1037 static int
1038 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1039         struct ccwbk* p_last)
1040 {
1041         struct claw_privbk *privptr;
1042         struct ccw1  temp_ccw;
1043         struct endccw * p_end;
1044         CLAW_DBF_TEXT(4, trace, "addreads");
1045         privptr = dev->ml_priv;
1046         p_end = privptr->p_end_ccw;
1047
1048         /* first CCW and last CCW contains a new set of read channel programs
1049         *       to apend the running channel programs
1050         */
1051         if ( p_first==NULL) {
1052                 CLAW_DBF_TEXT(4, trace, "addexit");
1053                 return 0;
1054         }
1055
1056         /* set up ending CCW sequence for this segment */
1057         if (p_end->read1) {
1058                 p_end->read1=0x00;    /*  second ending CCW is now active */
1059                 /*      reset ending CCWs and setup TIC CCWs              */
1060                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1061                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1062                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1063                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1064                 p_end->read2_nop2.cda=0;
1065                 p_end->read2_nop2.count=1;
1066         }
1067         else {
1068                 p_end->read1=0x01;  /* first ending CCW is now active */
1069                 /*      reset ending CCWs and setup TIC CCWs          */
1070                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1071                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1072                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1073                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1074                 p_end->read1_nop2.cda=0;
1075                 p_end->read1_nop2.count=1;
1076         }
1077
1078         if ( privptr-> p_read_active_first ==NULL ) {
1079                 privptr-> p_read_active_first= p_first;  /*    set new first */
1080                 privptr-> p_read_active_last = p_last;   /*    set new last  */
1081         }
1082         else {
1083
1084                 /* set up TIC ccw  */
1085                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1086                 temp_ccw.count=0;
1087                 temp_ccw.flags=0;
1088                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1089
1090
1091                 if (p_end->read1) {
1092
1093                /* first set of CCW's is chained to the new read              */
1094                /* chain, so the second set is chained to the active chain.   */
1095                /* Therefore modify the second set to point to the new        */
1096                /* read chain set up TIC CCWs                                 */
1097                /* make sure we update the CCW so channel doesn't fetch it    */
1098                /* when it's only half done                                   */
1099                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1100                                 sizeof(struct ccw1));
1101                         privptr->p_read_active_last->r_TIC_1.cda=
1102                                 (__u32)__pa(&p_first->read);
1103                         privptr->p_read_active_last->r_TIC_2.cda=
1104                                 (__u32)__pa(&p_first->read);
1105                 }
1106                 else {
1107                         /* make sure we update the CCW so channel doesn't   */
1108                         /* fetch it when it is only half done               */
1109                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1110                                 sizeof(struct ccw1));
1111                         privptr->p_read_active_last->r_TIC_1.cda=
1112                                 (__u32)__pa(&p_first->read);
1113                         privptr->p_read_active_last->r_TIC_2.cda=
1114                                 (__u32)__pa(&p_first->read);
1115                 }
1116                 /*      chain in new set of blocks                              */
1117                 privptr->p_read_active_last->next = p_first;
1118                 privptr->p_read_active_last=p_last;
1119         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1120         CLAW_DBF_TEXT(4, trace, "addexit");
1121         return 0;
1122 }    /*     end of add_claw_reads   */
1123
1124 /*-------------------------------------------------------------------*
1125  *   ccw_check_return_code                                           *
1126  *                                                                   *
1127  *-------------------------------------------------------------------*/
1128
1129 static void
1130 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1131 {
1132         CLAW_DBF_TEXT(4, trace, "ccwret");
1133         if (return_code != 0) {
1134                 switch (return_code) {
1135                 case -EBUSY: /* BUSY is a transient state no action needed */
1136                         break;
1137                 case -ENODEV:
1138                         printk(KERN_EMERG "%s: Missing device called "
1139                                 "for IO ENODEV\n", dev_name(&cdev->dev));
1140                         break;
1141                 case -EIO:
1142                         printk(KERN_EMERG "%s: Status pending... EIO \n",
1143                                 dev_name(&cdev->dev));
1144                         break;
1145                 case -EINVAL:
1146                         printk(KERN_EMERG "%s: Invalid Dev State EINVAL \n",
1147                                 dev_name(&cdev->dev));
1148                         break;
1149                 default:
1150                         printk(KERN_EMERG "%s: Unknown error in "
1151                                  "Do_IO %d\n", dev_name(&cdev->dev),
1152                                return_code);
1153                 }
1154         }
1155         CLAW_DBF_TEXT(4, trace, "ccwret");
1156 }    /*    end of ccw_check_return_code   */
1157
1158 /*-------------------------------------------------------------------*
1159 *       ccw_check_unit_check                                         *
1160 *--------------------------------------------------------------------*/
1161
1162 static void
1163 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1164 {
1165         struct net_device *ndev = p_ch->ndev;
1166
1167         CLAW_DBF_TEXT(4, trace, "unitchek");
1168         printk(KERN_INFO "%s: Unit Check with sense byte:0x%04x\n",
1169                ndev->name, sense);
1170
1171         if (sense & 0x40) {
1172                 if (sense & 0x01) {
1173                         printk(KERN_WARNING "%s: Interface disconnect or "
1174                                 "Selective reset "
1175                                 "occurred (remote side)\n", ndev->name);
1176                 }
1177                 else {
1178                         printk(KERN_WARNING "%s: System reset occured"
1179                                 " (remote side)\n", ndev->name);
1180                 }
1181         }
1182         else if (sense & 0x20) {
1183                 if (sense & 0x04) {
1184                         printk(KERN_WARNING "%s: Data-streaming "
1185                                 "timeout)\n", ndev->name);
1186                 }
1187                 else  {
1188                         printk(KERN_WARNING "%s: Data-transfer parity"
1189                                 " error\n", ndev->name);
1190                 }
1191         }
1192         else if (sense & 0x10) {
1193                 if (sense & 0x20) {
1194                         printk(KERN_WARNING "%s: Hardware malfunction "
1195                                 "(remote side)\n", ndev->name);
1196                 }
1197                 else {
1198                         printk(KERN_WARNING "%s: read-data parity error "
1199                                 "(remote side)\n", ndev->name);
1200                 }
1201         }
1202
1203 }   /*    end of ccw_check_unit_check    */
1204
1205 /*-------------------------------------------------------------------*
1206 *               find_link                                            *
1207 *--------------------------------------------------------------------*/
1208 static int
1209 find_link(struct net_device *dev, char *host_name, char *ws_name )
1210 {
1211         struct claw_privbk *privptr;
1212         struct claw_env *p_env;
1213         int    rc=0;
1214
1215         CLAW_DBF_TEXT(2, setup, "findlink");
1216         privptr = dev->ml_priv;
1217         p_env=privptr->p_env;
1218         switch (p_env->packing)
1219         {
1220                 case  PACKING_ASK:
1221                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1222                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1223                              rc = EINVAL;
1224                         break;
1225                 case  DO_PACKED:
1226                 case  PACK_SEND:
1227                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1228                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1229                                 rc = EINVAL;
1230                         break;
1231                 default:
1232                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1233                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1234                                 rc = EINVAL;
1235                         break;
1236         }
1237
1238         return 0;
1239 }    /*    end of find_link    */
1240
1241 /*-------------------------------------------------------------------*
1242  *   claw_hw_tx                                                      *
1243  *                                                                   *
1244  *                                                                   *
1245  *-------------------------------------------------------------------*/
1246
1247 static int
1248 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1249 {
1250         int                             rc=0;
1251         struct claw_privbk              *privptr;
1252         struct ccwbk           *p_this_ccw;
1253         struct ccwbk           *p_first_ccw;
1254         struct ccwbk           *p_last_ccw;
1255         __u32                           numBuffers;
1256         signed long                     len_of_data;
1257         unsigned long                   bytesInThisBuffer;
1258         unsigned char                   *pDataAddress;
1259         struct endccw                   *pEnd;
1260         struct ccw1                     tempCCW;
1261         struct chbk                     *p_ch;
1262         struct claw_env                 *p_env;
1263         int                             lock;
1264         struct clawph                   *pk_head;
1265         struct chbk                     *ch;
1266
1267         CLAW_DBF_TEXT(4, trace, "hw_tx");
1268         privptr = (struct claw_privbk *)(dev->ml_priv);
1269         p_ch=(struct chbk *)&privptr->channel[WRITE];
1270         p_env =privptr->p_env;
1271         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1272         /*  scan the write queue to free any completed write packets   */
1273         p_first_ccw=NULL;
1274         p_last_ccw=NULL;
1275         if ((p_env->packing >= PACK_SEND) &&
1276             (skb->cb[1] != 'P')) {
1277                 skb_push(skb,sizeof(struct clawph));
1278                 pk_head=(struct clawph *)skb->data;
1279                 pk_head->len=skb->len-sizeof(struct clawph);
1280                 if (pk_head->len%4)  {
1281                         pk_head->len+= 4-(pk_head->len%4);
1282                         skb_pad(skb,4-(pk_head->len%4));
1283                         skb_put(skb,4-(pk_head->len%4));
1284                 }
1285                 if (p_env->packing == DO_PACKED)
1286                         pk_head->link_num = linkid;
1287                 else
1288                         pk_head->link_num = 0;
1289                 pk_head->flag = 0x00;
1290                 skb_pad(skb,4);
1291                 skb->cb[1] = 'P';
1292         }
1293         if (linkid == 0) {
1294                 if (claw_check_busy(dev)) {
1295                         if (privptr->write_free_count!=0) {
1296                                 claw_clear_busy(dev);
1297                         }
1298                         else {
1299                                 claw_strt_out_IO(dev );
1300                                 claw_free_wrt_buf( dev );
1301                                 if (privptr->write_free_count==0) {
1302                                         ch = &privptr->channel[WRITE];
1303                                         atomic_inc(&skb->users);
1304                                         skb_queue_tail(&ch->collect_queue, skb);
1305                                         goto Done;
1306                                 }
1307                                 else {
1308                                         claw_clear_busy(dev);
1309                                 }
1310                         }
1311                 }
1312                 /*  tx lock  */
1313                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1314                         ch = &privptr->channel[WRITE];
1315                         atomic_inc(&skb->users);
1316                         skb_queue_tail(&ch->collect_queue, skb);
1317                         claw_strt_out_IO(dev );
1318                         rc=-EBUSY;
1319                         goto Done2;
1320                 }
1321         }
1322         /*      See how many write buffers are required to hold this data */
1323         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1324
1325         /*      If that number of buffers isn't available, give up for now */
1326         if (privptr->write_free_count < numBuffers ||
1327             privptr->p_write_free_chain == NULL ) {
1328
1329                 claw_setbit_busy(TB_NOBUFFER,dev);
1330                 ch = &privptr->channel[WRITE];
1331                 atomic_inc(&skb->users);
1332                 skb_queue_tail(&ch->collect_queue, skb);
1333                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1334                 goto Done2;
1335         }
1336         pDataAddress=skb->data;
1337         len_of_data=skb->len;
1338
1339         while (len_of_data > 0) {
1340                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1341                 if (p_this_ccw == NULL) { /* lost the race */
1342                         ch = &privptr->channel[WRITE];
1343                         atomic_inc(&skb->users);
1344                         skb_queue_tail(&ch->collect_queue, skb);
1345                         goto Done2;
1346                 }
1347                 privptr->p_write_free_chain=p_this_ccw->next;
1348                 p_this_ccw->next=NULL;
1349                 --privptr->write_free_count; /* -1 */
1350                 bytesInThisBuffer=len_of_data;
1351                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1352                 len_of_data-=bytesInThisBuffer;
1353                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1354                 /*      setup write CCW         */
1355                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1356                 if (len_of_data>0) {
1357                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1358                 }
1359                 p_this_ccw->write.count=bytesInThisBuffer;
1360                 /*      now add to end of this chain    */
1361                 if (p_first_ccw==NULL)    {
1362                         p_first_ccw=p_this_ccw;
1363                 }
1364                 if (p_last_ccw!=NULL) {
1365                         p_last_ccw->next=p_this_ccw;
1366                         /*      set up TIC ccws         */
1367                         p_last_ccw->w_TIC_1.cda=
1368                                 (__u32)__pa(&p_this_ccw->write);
1369                 }
1370                 p_last_ccw=p_this_ccw;      /* save new last block */
1371         }
1372
1373         /*      FirstCCW and LastCCW now contain a new set of write channel
1374         *       programs to append to the running channel program
1375         */
1376
1377         if (p_first_ccw!=NULL) {
1378                 /*      setup ending ccw sequence for this segment              */
1379                 pEnd=privptr->p_end_ccw;
1380                 if (pEnd->write1) {
1381                         pEnd->write1=0x00;   /* second end ccw is now active */
1382                         /*      set up Tic CCWs         */
1383                         p_last_ccw->w_TIC_1.cda=
1384                                 (__u32)__pa(&pEnd->write2_nop1);
1385                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1386                         pEnd->write2_nop2.flags    =
1387                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1388                         pEnd->write2_nop2.cda=0;
1389                         pEnd->write2_nop2.count=1;
1390                 }
1391                 else {  /*  end of if (pEnd->write1)*/
1392                         pEnd->write1=0x01;   /* first end ccw is now active */
1393                         /*      set up Tic CCWs         */
1394                         p_last_ccw->w_TIC_1.cda=
1395                                 (__u32)__pa(&pEnd->write1_nop1);
1396                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1397                         pEnd->write1_nop2.flags    =
1398                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1399                         pEnd->write1_nop2.cda=0;
1400                         pEnd->write1_nop2.count=1;
1401                 }  /* end if if (pEnd->write1) */
1402
1403                 if (privptr->p_write_active_first==NULL ) {
1404                         privptr->p_write_active_first=p_first_ccw;
1405                         privptr->p_write_active_last=p_last_ccw;
1406                 }
1407                 else {
1408                         /*      set up Tic CCWs         */
1409
1410                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1411                         tempCCW.count=0;
1412                         tempCCW.flags=0;
1413                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1414
1415                         if (pEnd->write1) {
1416
1417                  /*
1418                  * first set of ending CCW's is chained to the new write
1419                  * chain, so the second set is chained to the active chain
1420                  * Therefore modify the second set to point the new write chain.
1421                  * make sure we update the CCW atomically
1422                  * so channel does not fetch it when it's only half done
1423                  */
1424                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1425                                         sizeof(struct ccw1));
1426                                 privptr->p_write_active_last->w_TIC_1.cda=
1427                                         (__u32)__pa(&p_first_ccw->write);
1428                         }
1429                         else {
1430
1431                         /*make sure we update the CCW atomically
1432                          *so channel does not fetch it when it's only half done
1433                          */
1434                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1435                                         sizeof(struct ccw1));
1436                                 privptr->p_write_active_last->w_TIC_1.cda=
1437                                         (__u32)__pa(&p_first_ccw->write);
1438
1439                         } /* end if if (pEnd->write1) */
1440
1441                         privptr->p_write_active_last->next=p_first_ccw;
1442                         privptr->p_write_active_last=p_last_ccw;
1443                 }
1444
1445         } /* endif (p_first_ccw!=NULL)  */
1446         dev_kfree_skb_any(skb);
1447         if (linkid==0) {
1448                 lock=LOCK_NO;
1449         }
1450         else  {
1451                 lock=LOCK_YES;
1452         }
1453         claw_strt_out_IO(dev );
1454         /*      if write free count is zero , set NOBUFFER       */
1455         if (privptr->write_free_count==0) {
1456                 claw_setbit_busy(TB_NOBUFFER,dev);
1457         }
1458 Done2:
1459         claw_clearbit_busy(TB_TX,dev);
1460 Done:
1461         return(rc);
1462 }    /*    end of claw_hw_tx    */
1463
1464 /*-------------------------------------------------------------------*
1465 *                                                                    *
1466 *     init_ccw_bk                                                    *
1467 *                                                                    *
1468 *--------------------------------------------------------------------*/
1469
1470 static int
1471 init_ccw_bk(struct net_device *dev)
1472 {
1473
1474         __u32   ccw_blocks_required;
1475         __u32   ccw_blocks_perpage;
1476         __u32   ccw_pages_required;
1477         __u32   claw_reads_perpage=1;
1478         __u32   claw_read_pages;
1479         __u32   claw_writes_perpage=1;
1480         __u32   claw_write_pages;
1481         void    *p_buff=NULL;
1482         struct ccwbk*p_free_chain;
1483         struct ccwbk*p_buf;
1484         struct ccwbk*p_last_CCWB;
1485         struct ccwbk*p_first_CCWB;
1486         struct endccw *p_endccw=NULL;
1487         addr_t  real_address;
1488         struct claw_privbk *privptr = dev->ml_priv;
1489         struct clawh *pClawH=NULL;
1490         addr_t   real_TIC_address;
1491         int i,j;
1492         CLAW_DBF_TEXT(4, trace, "init_ccw");
1493
1494         /*  initialize  statistics field */
1495         privptr->active_link_ID=0;
1496         /*  initialize  ccwbk pointers  */
1497         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1498         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1499         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1500         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1501         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1502         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1503         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1504         privptr->buffs_alloc = 0;
1505         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1506         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1507         /*  initialize  free write ccwbk counter  */
1508         privptr->write_free_count=0;  /* number of free bufs on write chain */
1509         p_last_CCWB = NULL;
1510         p_first_CCWB= NULL;
1511         /*
1512         *  We need 1 CCW block for each read buffer, 1 for each
1513         *  write buffer, plus 1 for ClawSignalBlock
1514         */
1515         ccw_blocks_required =
1516                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1517         /*
1518         * compute number of CCW blocks that will fit in a page
1519         */
1520         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1521         ccw_pages_required=
1522                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1523
1524         /*
1525          *  read and write sizes are set by 2 constants in claw.h
1526          *  4k and 32k.  Unpacked values other than 4k are not going to
1527          * provide good performance. With packing buffers support 32k
1528          * buffers are used.
1529          */
1530         if (privptr->p_env->read_size < PAGE_SIZE) {
1531                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1532                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1533                                                 claw_reads_perpage);
1534          }
1535          else {       /* > or equal  */
1536                 privptr->p_buff_pages_perread =
1537                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1538                 claw_read_pages = privptr->p_env->read_buffers *
1539                                         privptr->p_buff_pages_perread;
1540          }
1541         if (privptr->p_env->write_size < PAGE_SIZE) {
1542                 claw_writes_perpage =
1543                         PAGE_SIZE / privptr->p_env->write_size;
1544                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1545                                                 claw_writes_perpage);
1546
1547         }
1548         else {      /* >  or equal  */
1549                 privptr->p_buff_pages_perwrite =
1550                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1551                 claw_write_pages = privptr->p_env->write_buffers *
1552                                         privptr->p_buff_pages_perwrite;
1553         }
1554         /*
1555         *               allocate ccw_pages_required
1556         */
1557         if (privptr->p_buff_ccw==NULL) {
1558                 privptr->p_buff_ccw=
1559                         (void *)__get_free_pages(__GFP_DMA,
1560                         (int)pages_to_order_of_mag(ccw_pages_required ));
1561                 if (privptr->p_buff_ccw==NULL) {
1562                         return -ENOMEM;
1563                 }
1564                 privptr->p_buff_ccw_num=ccw_pages_required;
1565         }
1566         memset(privptr->p_buff_ccw, 0x00,
1567                 privptr->p_buff_ccw_num * PAGE_SIZE);
1568
1569         /*
1570         *               obtain ending ccw block address
1571         *
1572         */
1573         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1574         real_address  = (__u32)__pa(privptr->p_end_ccw);
1575         /*                              Initialize ending CCW block       */
1576         p_endccw=privptr->p_end_ccw;
1577         p_endccw->real=real_address;
1578         p_endccw->write1=0x00;
1579         p_endccw->read1=0x00;
1580
1581         /*      write1_nop1                                     */
1582         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1583         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1584         p_endccw->write1_nop1.count       = 1;
1585         p_endccw->write1_nop1.cda         = 0;
1586
1587         /*      write1_nop2                                     */
1588         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1589         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1590         p_endccw->write1_nop2.count      = 1;
1591         p_endccw->write1_nop2.cda        = 0;
1592
1593         /*      write2_nop1                                     */
1594         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1595         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1596         p_endccw->write2_nop1.count        = 1;
1597         p_endccw->write2_nop1.cda          = 0;
1598
1599         /*      write2_nop2                                     */
1600         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1601         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1602         p_endccw->write2_nop2.count        = 1;
1603         p_endccw->write2_nop2.cda          = 0;
1604
1605         /*      read1_nop1                                      */
1606         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1607         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1608         p_endccw->read1_nop1.count        = 1;
1609         p_endccw->read1_nop1.cda          = 0;
1610
1611         /*      read1_nop2                                      */
1612         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1613         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1614         p_endccw->read1_nop2.count        = 1;
1615         p_endccw->read1_nop2.cda          = 0;
1616
1617         /*      read2_nop1                                      */
1618         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1619         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1620         p_endccw->read2_nop1.count        = 1;
1621         p_endccw->read2_nop1.cda          = 0;
1622
1623         /*      read2_nop2                                      */
1624         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1625         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1626         p_endccw->read2_nop2.count        = 1;
1627         p_endccw->read2_nop2.cda          = 0;
1628
1629         /*
1630         *                               Build a chain of CCWs
1631         *
1632         */
1633         p_buff=privptr->p_buff_ccw;
1634
1635         p_free_chain=NULL;
1636         for (i=0 ; i < ccw_pages_required; i++ ) {
1637                 real_address  = (__u32)__pa(p_buff);
1638                 p_buf=p_buff;
1639                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1640                         p_buf->next  = p_free_chain;
1641                         p_free_chain = p_buf;
1642                         p_buf->real=(__u32)__pa(p_buf);
1643                         ++p_buf;
1644                 }
1645                 p_buff+=PAGE_SIZE;
1646         }
1647         /*
1648         *                               Initialize ClawSignalBlock
1649         *
1650         */
1651         if (privptr->p_claw_signal_blk==NULL) {
1652                 privptr->p_claw_signal_blk=p_free_chain;
1653                 p_free_chain=p_free_chain->next;
1654                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1655                 pClawH->length=0xffff;
1656                 pClawH->opcode=0xff;
1657                 pClawH->flag=CLAW_BUSY;
1658         }
1659
1660         /*
1661         *               allocate write_pages_required and add to free chain
1662         */
1663         if (privptr->p_buff_write==NULL) {
1664             if (privptr->p_env->write_size < PAGE_SIZE) {
1665                 privptr->p_buff_write=
1666                         (void *)__get_free_pages(__GFP_DMA,
1667                         (int)pages_to_order_of_mag(claw_write_pages ));
1668                 if (privptr->p_buff_write==NULL) {
1669                         privptr->p_buff_ccw=NULL;
1670                         return -ENOMEM;
1671                 }
1672                 /*
1673                 *                               Build CLAW write free chain
1674                 *
1675                 */
1676
1677                 memset(privptr->p_buff_write, 0x00,
1678                         ccw_pages_required * PAGE_SIZE);
1679                 privptr->p_write_free_chain=NULL;
1680
1681                 p_buff=privptr->p_buff_write;
1682
1683                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1684                         p_buf        = p_free_chain;      /*  get a CCW */
1685                         p_free_chain = p_buf->next;
1686                         p_buf->next  =privptr->p_write_free_chain;
1687                         privptr->p_write_free_chain = p_buf;
1688                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1689                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1690                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1691                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1692                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1693                         p_buf-> w_read_FF.count   = 1;
1694                         p_buf-> w_read_FF.cda     =
1695                                 (__u32)__pa(&p_buf-> header.flag);
1696                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1697                         p_buf-> w_TIC_1.flags      = 0;
1698                         p_buf-> w_TIC_1.count      = 0;
1699
1700                         if (((unsigned long)p_buff+privptr->p_env->write_size) >=
1701                            ((unsigned long)(p_buff+2*
1702                                 (privptr->p_env->write_size) -1) & PAGE_MASK)) {
1703                         p_buff= p_buff+privptr->p_env->write_size;
1704                         }
1705                 }
1706            }
1707            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1708            {
1709                privptr->p_write_free_chain=NULL;
1710                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1711                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1712                         (int)pages_to_order_of_mag(
1713                         privptr->p_buff_pages_perwrite) );
1714                    if (p_buff==NULL) {
1715                         free_pages((unsigned long)privptr->p_buff_ccw,
1716                               (int)pages_to_order_of_mag(
1717                                         privptr->p_buff_ccw_num));
1718                         privptr->p_buff_ccw=NULL;
1719                         p_buf=privptr->p_buff_write;
1720                         while (p_buf!=NULL) {
1721                                 free_pages((unsigned long)
1722                                         p_buf->p_buffer,
1723                                         (int)pages_to_order_of_mag(
1724                                         privptr->p_buff_pages_perwrite));
1725                                 p_buf=p_buf->next;
1726                         }
1727                         return -ENOMEM;
1728                    }  /* Error on get_pages   */
1729                    memset(p_buff, 0x00, privptr->p_env->write_size );
1730                    p_buf         = p_free_chain;
1731                    p_free_chain  = p_buf->next;
1732                    p_buf->next   = privptr->p_write_free_chain;
1733                    privptr->p_write_free_chain = p_buf;
1734                    privptr->p_buff_write = p_buf;
1735                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1736                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1737                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1738                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1739                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1740                    p_buf-> w_read_FF.count    = 1;
1741                    p_buf-> w_read_FF.cda      =
1742                         (__u32)__pa(&p_buf-> header.flag);
1743                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1744                    p_buf-> w_TIC_1.flags   = 0;
1745                    p_buf-> w_TIC_1.count   = 0;
1746                }  /* for all write_buffers   */
1747
1748            }    /* else buffers are PAGE_SIZE or bigger */
1749
1750         }
1751         privptr->p_buff_write_num=claw_write_pages;
1752         privptr->write_free_count=privptr->p_env->write_buffers;
1753
1754
1755         /*
1756         *               allocate read_pages_required and chain to free chain
1757         */
1758         if (privptr->p_buff_read==NULL) {
1759             if (privptr->p_env->read_size < PAGE_SIZE)  {
1760                 privptr->p_buff_read=
1761                         (void *)__get_free_pages(__GFP_DMA,
1762                         (int)pages_to_order_of_mag(claw_read_pages) );
1763                 if (privptr->p_buff_read==NULL) {
1764                         free_pages((unsigned long)privptr->p_buff_ccw,
1765                                 (int)pages_to_order_of_mag(
1766                                         privptr->p_buff_ccw_num));
1767                         /* free the write pages size is < page size  */
1768                         free_pages((unsigned long)privptr->p_buff_write,
1769                                 (int)pages_to_order_of_mag(
1770                                 privptr->p_buff_write_num));
1771                         privptr->p_buff_ccw=NULL;
1772                         privptr->p_buff_write=NULL;
1773                         return -ENOMEM;
1774                 }
1775                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1776                 privptr->p_buff_read_num=claw_read_pages;
1777                 /*
1778                 *                               Build CLAW read free chain
1779                 *
1780                 */
1781                 p_buff=privptr->p_buff_read;
1782                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1783                         p_buf        = p_free_chain;
1784                         p_free_chain = p_buf->next;
1785
1786                         if (p_last_CCWB==NULL) {
1787                                 p_buf->next=NULL;
1788                                 real_TIC_address=0;
1789                                 p_last_CCWB=p_buf;
1790                         }
1791                         else {
1792                                 p_buf->next=p_first_CCWB;
1793                                 real_TIC_address=
1794                                 (__u32)__pa(&p_first_CCWB -> read );
1795                         }
1796
1797                         p_first_CCWB=p_buf;
1798
1799                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1800                         /*  initialize read command */
1801                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1802                         p_buf-> read.cda = (__u32)__pa(p_buff);
1803                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1804                         p_buf-> read.count       = privptr->p_env->read_size;
1805
1806                         /*  initialize read_h command */
1807                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1808                         p_buf-> read_h.cda =
1809                                 (__u32)__pa(&(p_buf->header));
1810                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1811                         p_buf-> read_h.count      = sizeof(struct clawh);
1812
1813                         /*  initialize Signal command */
1814                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1815                         p_buf-> signal.cda =
1816                                 (__u32)__pa(&(pClawH->flag));
1817                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1818                         p_buf-> signal.count     = 1;
1819
1820                         /*  initialize r_TIC_1 command */
1821                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1822                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1823                         p_buf-> r_TIC_1.flags = 0;
1824                         p_buf-> r_TIC_1.count      = 0;
1825
1826                         /*  initialize r_read_FF command */
1827                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1828                         p_buf-> r_read_FF.cda =
1829                                 (__u32)__pa(&(pClawH->flag));
1830                         p_buf-> r_read_FF.flags =
1831                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1832                         p_buf-> r_read_FF.count    = 1;
1833
1834                         /*    initialize r_TIC_2          */
1835                         memcpy(&p_buf->r_TIC_2,
1836                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1837
1838                         /*     initialize Header     */
1839                         p_buf->header.length=0xffff;
1840                         p_buf->header.opcode=0xff;
1841                         p_buf->header.flag=CLAW_PENDING;
1842
1843                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1844                                 ((unsigned long)(p_buff+2*(privptr->p_env->read_size) -1)
1845                                  & PAGE_MASK) ) {
1846                                 p_buff= p_buff+privptr->p_env->read_size;
1847                         }
1848                         else {
1849                                 p_buff=
1850                                 (void *)((unsigned long)
1851                                         (p_buff+2*(privptr->p_env->read_size) -1)
1852                                          & PAGE_MASK) ;
1853                         }
1854                 }   /* for read_buffers   */
1855           }         /* read_size < PAGE_SIZE  */
1856           else {  /* read Size >= PAGE_SIZE  */
1857                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1858                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1859                                 (int)pages_to_order_of_mag(privptr->p_buff_pages_perread) );
1860                         if (p_buff==NULL) {
1861                                 free_pages((unsigned long)privptr->p_buff_ccw,
1862                                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
1863                                 /* free the write pages  */
1864                                 p_buf=privptr->p_buff_write;
1865                                 while (p_buf!=NULL) {
1866                                         free_pages((unsigned long)p_buf->p_buffer,
1867                                                 (int)pages_to_order_of_mag(
1868                                                 privptr->p_buff_pages_perwrite ));
1869                                         p_buf=p_buf->next;
1870                                 }
1871                                 /* free any read pages already alloc  */
1872                                 p_buf=privptr->p_buff_read;
1873                                 while (p_buf!=NULL) {
1874                                         free_pages((unsigned long)p_buf->p_buffer,
1875                                                 (int)pages_to_order_of_mag(
1876                                                 privptr->p_buff_pages_perread ));
1877                                         p_buf=p_buf->next;
1878                                 }
1879                                 privptr->p_buff_ccw=NULL;
1880                                 privptr->p_buff_write=NULL;
1881                                 return -ENOMEM;
1882                         }
1883                         memset(p_buff, 0x00, privptr->p_env->read_size);
1884                         p_buf        = p_free_chain;
1885                         privptr->p_buff_read = p_buf;
1886                         p_free_chain = p_buf->next;
1887
1888                         if (p_last_CCWB==NULL) {
1889                                 p_buf->next=NULL;
1890                                 real_TIC_address=0;
1891                                 p_last_CCWB=p_buf;
1892                         }
1893                         else {
1894                                 p_buf->next=p_first_CCWB;
1895                                 real_TIC_address=
1896                                         (addr_t)__pa(
1897                                                 &p_first_CCWB -> read );
1898                         }
1899
1900                         p_first_CCWB=p_buf;
1901                                 /* save buff address */
1902                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1903                         /*  initialize read command */
1904                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1905                         p_buf-> read.cda = (__u32)__pa(p_buff);
1906                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1907                         p_buf-> read.count       = privptr->p_env->read_size;
1908
1909                         /*  initialize read_h command */
1910                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1911                         p_buf-> read_h.cda =
1912                                 (__u32)__pa(&(p_buf->header));
1913                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1914                         p_buf-> read_h.count      = sizeof(struct clawh);
1915
1916                         /*  initialize Signal command */
1917                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1918                         p_buf-> signal.cda =
1919                                 (__u32)__pa(&(pClawH->flag));
1920                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1921                         p_buf-> signal.count     = 1;
1922
1923                         /*  initialize r_TIC_1 command */
1924                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1925                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1926                         p_buf-> r_TIC_1.flags = 0;
1927                         p_buf-> r_TIC_1.count      = 0;
1928
1929                         /*  initialize r_read_FF command */
1930                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1931                         p_buf-> r_read_FF.cda =
1932                                 (__u32)__pa(&(pClawH->flag));
1933                         p_buf-> r_read_FF.flags =
1934                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1935                         p_buf-> r_read_FF.count    = 1;
1936
1937                         /*    initialize r_TIC_2          */
1938                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1939                                 sizeof(struct ccw1));
1940
1941                         /*     initialize Header     */
1942                         p_buf->header.length=0xffff;
1943                         p_buf->header.opcode=0xff;
1944                         p_buf->header.flag=CLAW_PENDING;
1945
1946                 }    /* For read_buffers   */
1947           }     /*  read_size >= PAGE_SIZE   */
1948         }       /*  pBuffread = NULL */
1949         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1950         privptr->buffs_alloc = 1;
1951
1952         return 0;
1953 }    /*    end of init_ccw_bk */
1954
1955 /*-------------------------------------------------------------------*
1956 *                                                                    *
1957 *       probe_error                                                  *
1958 *                                                                    *
1959 *--------------------------------------------------------------------*/
1960
1961 static void
1962 probe_error( struct ccwgroup_device *cgdev)
1963 {
1964         struct claw_privbk *privptr;
1965
1966         CLAW_DBF_TEXT(4, trace, "proberr");
1967         privptr = (struct claw_privbk *) cgdev->dev.driver_data;
1968         if (privptr != NULL) {
1969                 cgdev->dev.driver_data = NULL;
1970                 kfree(privptr->p_env);
1971                 kfree(privptr->p_mtc_envelope);
1972                 kfree(privptr);
1973         }
1974 }    /*    probe_error    */
1975
1976 /*-------------------------------------------------------------------*
1977 *    claw_process_control                                            *
1978 *                                                                    *
1979 *                                                                    *
1980 *--------------------------------------------------------------------*/
1981
1982 static int
1983 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1984 {
1985
1986         struct clawbuf *p_buf;
1987         struct clawctl  ctlbk;
1988         struct clawctl *p_ctlbk;
1989         char    temp_host_name[8];
1990         char    temp_ws_name[8];
1991         struct claw_privbk *privptr;
1992         struct claw_env *p_env;
1993         struct sysval *p_sysval;
1994         struct conncmd *p_connect=NULL;
1995         int rc;
1996         struct chbk *p_ch = NULL;
1997         struct device *tdev;
1998         CLAW_DBF_TEXT(2, setup, "clw_cntl");
1999         udelay(1000);  /* Wait a ms for the control packets to
2000                         *catch up to each other */
2001         privptr = dev->ml_priv;
2002         p_env=privptr->p_env;
2003         tdev = &privptr->channel[READ].cdev->dev;
2004         memcpy( &temp_host_name, p_env->host_name, 8);
2005         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2006         printk(KERN_INFO "%s: CLAW device %.8s: "
2007                 "Received Control Packet\n",
2008                 dev->name, temp_ws_name);
2009         if (privptr->release_pend==1) {
2010                 return 0;
2011         }
2012         p_buf=p_ccw->p_buffer;
2013         p_ctlbk=&ctlbk;
2014         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2015                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2016         } else {
2017                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2018         }
2019         switch (p_ctlbk->command)
2020         {
2021         case SYSTEM_VALIDATE_REQUEST:
2022                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2023                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2024                                 CLAW_RC_WRONG_VERSION);
2025                         printk("%s: %d is wrong version id. "
2026                                "Expected %d\n",
2027                                dev->name, p_ctlbk->version,
2028                                CLAW_VERSION_ID);
2029                 }
2030                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2031                 printk("%s: Recv Sys Validate Request: "
2032                        "Vers=%d,link_id=%d,Corr=%d,WS name=%."
2033                        "8s,Host name=%.8s\n",
2034                        dev->name, p_ctlbk->version,
2035                        p_ctlbk->linkid,
2036                        p_ctlbk->correlator,
2037                        p_sysval->WS_name,
2038                        p_sysval->host_name);
2039                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2040                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2041                                 CLAW_RC_NAME_MISMATCH);
2042                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2043                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2044                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2045                         printk(KERN_INFO "%s:  Host name mismatch\n",
2046                                 dev->name);
2047                         printk(KERN_INFO "%s: Received :%s: "
2048                                 "expected :%s: \n",
2049                                 dev->name,
2050                                 p_sysval->host_name,
2051                                 temp_host_name);
2052                 }
2053                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2054                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2055                                 CLAW_RC_NAME_MISMATCH);
2056                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2057                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2058                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2059                         printk(KERN_INFO "%s: WS name mismatch\n",
2060                                 dev->name);
2061                         printk(KERN_INFO "%s: Received :%s: "
2062                                "expected :%s: \n",
2063                                dev->name,
2064                                p_sysval->WS_name,
2065                                temp_ws_name);
2066                 }
2067                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2068                     (p_env->packing == 0)) {
2069                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2070                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2071                         printk(KERN_INFO "%s: host write size is too "
2072                                 "small\n", dev->name);
2073                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2074                 }
2075                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2076                     (p_env->packing == 0)) {
2077                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2078                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2079                         printk(KERN_INFO "%s: host read size is too "
2080                                 "small\n", dev->name);
2081                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2082                 }
2083                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2084                 printk(KERN_INFO "%s: CLAW device %.8s: System validate "
2085                         "completed.\n", dev->name, temp_ws_name);
2086                 printk("%s: sys Validate Rsize:%d Wsize:%d\n", dev->name,
2087                         p_sysval->read_frame_size, p_sysval->write_frame_size);
2088                 privptr->system_validate_comp = 1;
2089                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2090                         p_env->packing = PACKING_ASK;
2091                 claw_strt_conn_req(dev);
2092                 break;
2093         case SYSTEM_VALIDATE_RESPONSE:
2094                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2095                 printk("%s: Recv Sys Validate Resp: Vers=%d,Corr=%d,RC=%d,"
2096                         "WS name=%.8s,Host name=%.8s\n",
2097                         dev->name,
2098                         p_ctlbk->version,
2099                         p_ctlbk->correlator,
2100                         p_ctlbk->rc,
2101                         p_sysval->WS_name,
2102                         p_sysval->host_name);
2103                 switch (p_ctlbk->rc) {
2104                 case 0:
2105                         printk(KERN_INFO "%s: CLAW device "
2106                                 "%.8s: System validate "
2107                                 "completed.\n",
2108                                dev->name, temp_ws_name);
2109                         if (privptr->system_validate_comp == 0)
2110                                 claw_strt_conn_req(dev);
2111                         privptr->system_validate_comp = 1;
2112                         break;
2113                 case CLAW_RC_NAME_MISMATCH:
2114                         printk(KERN_INFO "%s: Sys Validate "
2115                                 "Resp : Host, WS name is "
2116                                 "mismatch\n",
2117                                dev->name);
2118                         break;
2119                 case CLAW_RC_WRONG_VERSION:
2120                         printk(KERN_INFO "%s: Sys Validate "
2121                                 "Resp : Wrong version\n",
2122                                 dev->name);
2123                         break;
2124                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2125                         printk(KERN_INFO "%s: Sys Validate "
2126                                 "Resp : bad frame size\n",
2127                                 dev->name);
2128                         break;
2129                 default:
2130                         printk(KERN_INFO "%s: Sys Validate "
2131                                 "error code=%d \n",
2132                                  dev->name, p_ctlbk->rc);
2133                         break;
2134                 }
2135                 break;
2136
2137         case CONNECTION_REQUEST:
2138                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2139                 printk(KERN_INFO "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2140                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2141                         dev->name,
2142                         p_ctlbk->version,
2143                         p_ctlbk->linkid,
2144                         p_ctlbk->correlator,
2145                         p_connect->host_name,
2146                         p_connect->WS_name);
2147                 if (privptr->active_link_ID != 0) {
2148                         claw_snd_disc(dev, p_ctlbk);
2149                         printk(KERN_INFO "%s: Conn Req error : "
2150                                 "already logical link is active \n",
2151                                 dev->name);
2152                 }
2153                 if (p_ctlbk->linkid != 1) {
2154                         claw_snd_disc(dev, p_ctlbk);
2155                         printk(KERN_INFO "%s: Conn Req error : "
2156                                 "req logical link id is not 1\n",
2157                                 dev->name);
2158                 }
2159                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2160                 if (rc != 0) {
2161                         claw_snd_disc(dev, p_ctlbk);
2162                         printk(KERN_INFO "%s: Conn Resp error: "
2163                                 "req appl name does not match\n",
2164                                 dev->name);
2165                 }
2166                 claw_send_control(dev,
2167                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2168                         p_ctlbk->correlator,
2169                         0, p_connect->host_name,
2170                         p_connect->WS_name);
2171                 if (p_env->packing == PACKING_ASK) {
2172                         p_env->packing = PACK_SEND;
2173                         claw_snd_conn_req(dev, 0);
2174                 }
2175                 printk(KERN_INFO "%s: CLAW device %.8s: Connection "
2176                         "completed link_id=%d.\n",
2177                         dev->name, temp_ws_name,
2178                         p_ctlbk->linkid);
2179                         privptr->active_link_ID = p_ctlbk->linkid;
2180                         p_ch = &privptr->channel[WRITE];
2181                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2182                 break;
2183         case CONNECTION_RESPONSE:
2184                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2185                 printk(KERN_INFO "%s: Revc Conn Resp: Vers=%d,link_id=%d,"
2186                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2187                         dev->name,
2188                         p_ctlbk->version,
2189                         p_ctlbk->linkid,
2190                         p_ctlbk->correlator,
2191                         p_ctlbk->rc,
2192                         p_connect->host_name,
2193                         p_connect->WS_name);
2194
2195                 if (p_ctlbk->rc != 0) {
2196                         printk(KERN_INFO "%s: Conn Resp error: rc=%d \n",
2197                                 dev->name, p_ctlbk->rc);
2198                         return 1;
2199                 }
2200                 rc = find_link(dev,
2201                         p_connect->host_name, p_connect->WS_name);
2202                 if (rc != 0) {
2203                         claw_snd_disc(dev, p_ctlbk);
2204                         printk(KERN_INFO "%s: Conn Resp error: "
2205                                 "req appl name does not match\n",
2206                                  dev->name);
2207                 }
2208                 /* should be until CONNECTION_CONFIRM */
2209                 privptr->active_link_ID = -(p_ctlbk->linkid);
2210                 break;
2211         case CONNECTION_CONFIRM:
2212                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2213                 printk(KERN_INFO "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2214                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2215                         dev->name,
2216                         p_ctlbk->version,
2217                         p_ctlbk->linkid,
2218                         p_ctlbk->correlator,
2219                         p_connect->host_name,
2220                         p_connect->WS_name);
2221                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2222                         privptr->active_link_ID = p_ctlbk->linkid;
2223                         if (p_env->packing > PACKING_ASK) {
2224                                 printk(KERN_INFO "%s: Confirmed Now packing\n",
2225                                         dev->name);
2226                                 p_env->packing = DO_PACKED;
2227                         }
2228                         p_ch = &privptr->channel[WRITE];
2229                         wake_up(&p_ch->wait);
2230                 } else {
2231                        printk(KERN_INFO "%s: Conn confirm: "
2232                                 "unexpected linkid=%d \n",
2233                                 dev->name, p_ctlbk->linkid);
2234                         claw_snd_disc(dev, p_ctlbk);
2235                 }
2236                 break;
2237         case DISCONNECT:
2238                 printk(KERN_INFO "%s: Disconnect: "
2239                         "Vers=%d,link_id=%d,Corr=%d\n",
2240                         dev->name, p_ctlbk->version,
2241                         p_ctlbk->linkid, p_ctlbk->correlator);
2242                 if ((p_ctlbk->linkid == 2) &&
2243                     (p_env->packing == PACK_SEND)) {
2244                         privptr->active_link_ID = 1;
2245                         p_env->packing = DO_PACKED;
2246                 } else
2247                         privptr->active_link_ID = 0;
2248                 break;
2249         case CLAW_ERROR:
2250                 printk(KERN_INFO "%s: CLAW ERROR detected\n",
2251                         dev->name);
2252                 break;
2253         default:
2254                 printk(KERN_INFO "%s:  Unexpected command code=%d \n",
2255                         dev->name,  p_ctlbk->command);
2256                 break;
2257         }
2258
2259         return 0;
2260 }   /*    end of claw_process_control    */
2261
2262
2263 /*-------------------------------------------------------------------*
2264 *               claw_send_control                                    *
2265 *                                                                    *
2266 *--------------------------------------------------------------------*/
2267
2268 static int
2269 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2270          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2271 {
2272         struct claw_privbk              *privptr;
2273         struct clawctl                  *p_ctl;
2274         struct sysval                   *p_sysval;
2275         struct conncmd                  *p_connect;
2276         struct sk_buff                  *skb;
2277
2278         CLAW_DBF_TEXT(2, setup, "sndcntl");
2279         privptr = dev->ml_priv;
2280         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2281
2282         p_ctl->command=type;
2283         p_ctl->version=CLAW_VERSION_ID;
2284         p_ctl->linkid=link;
2285         p_ctl->correlator=correlator;
2286         p_ctl->rc=rc;
2287
2288         p_sysval=(struct sysval *)&p_ctl->data;
2289         p_connect=(struct conncmd *)&p_ctl->data;
2290
2291         switch (p_ctl->command) {
2292                 case SYSTEM_VALIDATE_REQUEST:
2293                 case SYSTEM_VALIDATE_RESPONSE:
2294                         memcpy(&p_sysval->host_name, local_name, 8);
2295                         memcpy(&p_sysval->WS_name, remote_name, 8);
2296                         if (privptr->p_env->packing > 0) {
2297                                 p_sysval->read_frame_size=DEF_PACK_BUFSIZE;
2298                                 p_sysval->write_frame_size=DEF_PACK_BUFSIZE;
2299                         } else {
2300                                 /* how big is the biggest group of packets */
2301                                 p_sysval->read_frame_size=privptr->p_env->read_size;
2302                                 p_sysval->write_frame_size=privptr->p_env->write_size;
2303                         }
2304                         memset(&p_sysval->reserved, 0x00, 4);
2305                         break;
2306                 case CONNECTION_REQUEST:
2307                 case CONNECTION_RESPONSE:
2308                 case CONNECTION_CONFIRM:
2309                 case DISCONNECT:
2310                         memcpy(&p_sysval->host_name, local_name, 8);
2311                         memcpy(&p_sysval->WS_name, remote_name, 8);
2312                         if (privptr->p_env->packing > 0) {
2313                         /* How big is the biggest packet */
2314                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2315                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2316                         } else {
2317                                 memset(&p_connect->reserved1, 0x00, 4);
2318                                 memset(&p_connect->reserved2, 0x00, 4);
2319                         }
2320                         break;
2321                 default:
2322                         break;
2323         }
2324
2325         /*      write Control Record to the device                   */
2326
2327
2328         skb = dev_alloc_skb(sizeof(struct clawctl));
2329         if (!skb) {
2330                 return -ENOMEM;
2331         }
2332         memcpy(skb_put(skb, sizeof(struct clawctl)),
2333                 p_ctl, sizeof(struct clawctl));
2334         if (privptr->p_env->packing >= PACK_SEND)
2335                 claw_hw_tx(skb, dev, 1);
2336         else
2337                 claw_hw_tx(skb, dev, 0);
2338         return 0;
2339 }  /*   end of claw_send_control  */
2340
2341 /*-------------------------------------------------------------------*
2342 *               claw_snd_conn_req                                    *
2343 *                                                                    *
2344 *--------------------------------------------------------------------*/
2345 static int
2346 claw_snd_conn_req(struct net_device *dev, __u8 link)
2347 {
2348         int                rc;
2349         struct claw_privbk *privptr = dev->ml_priv;
2350         struct clawctl     *p_ctl;
2351
2352         CLAW_DBF_TEXT(2, setup, "snd_conn");
2353         rc = 1;
2354         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2355         p_ctl->linkid = link;
2356         if ( privptr->system_validate_comp==0x00 ) {
2357                 return rc;
2358         }
2359         if (privptr->p_env->packing == PACKING_ASK )
2360                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2361                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2362         if (privptr->p_env->packing == PACK_SEND)  {
2363                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2364                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2365         }
2366         if (privptr->p_env->packing == 0)
2367                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2368                         HOST_APPL_NAME, privptr->p_env->api_type);
2369         return rc;
2370
2371 }  /*  end of claw_snd_conn_req */
2372
2373
2374 /*-------------------------------------------------------------------*
2375 *               claw_snd_disc                                        *
2376 *                                                                    *
2377 *--------------------------------------------------------------------*/
2378
2379 static int
2380 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2381 {
2382         int rc;
2383         struct conncmd *  p_connect;
2384
2385         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2386         p_connect=(struct conncmd *)&p_ctl->data;
2387
2388         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2389                 p_ctl->correlator, 0,
2390                 p_connect->host_name, p_connect->WS_name);
2391         return rc;
2392 }     /*   end of claw_snd_disc    */
2393
2394
2395 /*-------------------------------------------------------------------*
2396 *               claw_snd_sys_validate_rsp                            *
2397 *                                                                    *
2398 *--------------------------------------------------------------------*/
2399
2400 static int
2401 claw_snd_sys_validate_rsp(struct net_device *dev,
2402         struct clawctl *p_ctl, __u32 return_code)
2403 {
2404         struct claw_env *  p_env;
2405         struct claw_privbk *privptr;
2406         int    rc;
2407
2408         CLAW_DBF_TEXT(2, setup, "chkresp");
2409         privptr = dev->ml_priv;
2410         p_env=privptr->p_env;
2411         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2412                 p_ctl->linkid,
2413                 p_ctl->correlator,
2414                 return_code,
2415                 p_env->host_name,
2416                 p_env->adapter_name  );
2417         return rc;
2418 }     /*    end of claw_snd_sys_validate_rsp    */
2419
2420 /*-------------------------------------------------------------------*
2421 *               claw_strt_conn_req                                   *
2422 *                                                                    *
2423 *--------------------------------------------------------------------*/
2424
2425 static int
2426 claw_strt_conn_req(struct net_device *dev )
2427 {
2428         int rc;
2429
2430         CLAW_DBF_TEXT(2, setup, "conn_req");
2431         rc=claw_snd_conn_req(dev, 1);
2432         return rc;
2433 }    /*   end of claw_strt_conn_req   */
2434
2435
2436
2437 /*-------------------------------------------------------------------*
2438  *   claw_stats                                                      *
2439  *-------------------------------------------------------------------*/
2440
2441 static struct
2442 net_device_stats *claw_stats(struct net_device *dev)
2443 {
2444         struct claw_privbk *privptr;
2445
2446         CLAW_DBF_TEXT(4, trace, "stats");
2447         privptr = dev->ml_priv;
2448         return &privptr->stats;
2449 }     /*   end of claw_stats   */
2450
2451
2452 /*-------------------------------------------------------------------*
2453 *       unpack_read                                                  *
2454 *                                                                    *
2455 *--------------------------------------------------------------------*/
2456 static void
2457 unpack_read(struct net_device *dev )
2458 {
2459         struct sk_buff *skb;
2460         struct claw_privbk *privptr;
2461         struct claw_env    *p_env;
2462         struct ccwbk    *p_this_ccw;
2463         struct ccwbk    *p_first_ccw;
2464         struct ccwbk    *p_last_ccw;
2465         struct clawph   *p_packh;
2466         void            *p_packd;
2467         struct clawctl  *p_ctlrec=NULL;
2468         struct device   *p_dev;
2469
2470         __u32   len_of_data;
2471         __u32   pack_off;
2472         __u8    link_num;
2473         __u8    mtc_this_frm=0;
2474         __u32   bytes_to_mov;
2475         int     i=0;
2476         int     p=0;
2477
2478         CLAW_DBF_TEXT(4, trace, "unpkread");
2479         p_first_ccw=NULL;
2480         p_last_ccw=NULL;
2481         p_packh=NULL;
2482         p_packd=NULL;
2483         privptr = dev->ml_priv;
2484
2485         p_dev = &privptr->channel[READ].cdev->dev;
2486         p_env = privptr->p_env;
2487         p_this_ccw=privptr->p_read_active_first;
2488         i=0;
2489         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2490                 pack_off = 0;
2491                 p = 0;
2492                 p_this_ccw->header.flag=CLAW_PENDING;
2493                 privptr->p_read_active_first=p_this_ccw->next;
2494                 p_this_ccw->next=NULL;
2495                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2496                 if ((p_env->packing == PACK_SEND) &&
2497                     (p_packh->len == 32)           &&
2498                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2499                         p_packh++;  /* peek past pack header */
2500                         p_ctlrec = (struct clawctl *)p_packh;
2501                         p_packh--;  /* un peek */
2502                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2503                             (p_ctlrec->command == CONNECTION_CONFIRM))
2504                                 p_env->packing = DO_PACKED;
2505                 }
2506                 if (p_env->packing == DO_PACKED)
2507                         link_num=p_packh->link_num;
2508                 else
2509                         link_num=p_this_ccw->header.opcode / 8;
2510                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2511                         mtc_this_frm=1;
2512                         if (p_this_ccw->header.length!=
2513                                 privptr->p_env->read_size ) {
2514                                 printk(KERN_INFO " %s: Invalid frame detected "
2515                                         "length is %02x\n" ,
2516                                         dev->name, p_this_ccw->header.length);
2517                         }
2518                 }
2519
2520                 if (privptr->mtc_skipping) {
2521                         /*
2522                         *   We're in the mode of skipping past a
2523                         *   multi-frame message
2524                         *   that we can't process for some reason or other.
2525                         *   The first frame without the More-To-Come flag is
2526                         *   the last frame of the skipped message.
2527                         */
2528                         /*  in case of More-To-Come not set in this frame */
2529                         if (mtc_this_frm==0) {
2530                                 privptr->mtc_skipping=0; /* Ok, the end */
2531                                 privptr->mtc_logical_link=-1;
2532                         }
2533                         goto NextFrame;
2534                 }
2535
2536                 if (link_num==0) {
2537                         claw_process_control(dev, p_this_ccw);
2538                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2539                         goto NextFrame;
2540                 }
2541 unpack_next:
2542                 if (p_env->packing == DO_PACKED) {
2543                         if (pack_off > p_env->read_size)
2544                                 goto NextFrame;
2545                         p_packd = p_this_ccw->p_buffer+pack_off;
2546                         p_packh = (struct clawph *) p_packd;
2547                         if ((p_packh->len == 0) || /* all done with this frame? */
2548                             (p_packh->flag != 0))
2549                                 goto NextFrame;
2550                         bytes_to_mov = p_packh->len;
2551                         pack_off += bytes_to_mov+sizeof(struct clawph);
2552                         p++;
2553                 } else {
2554                         bytes_to_mov=p_this_ccw->header.length;
2555                 }
2556                 if (privptr->mtc_logical_link<0) {
2557
2558                 /*
2559                 *  if More-To-Come is set in this frame then we don't know
2560                 *  length of entire message, and hence have to allocate
2561                 *  large buffer   */
2562
2563                 /*      We are starting a new envelope  */
2564                 privptr->mtc_offset=0;
2565                         privptr->mtc_logical_link=link_num;
2566                 }
2567
2568                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2569                         /*      error     */
2570                         privptr->stats.rx_frame_errors++;
2571                         goto NextFrame;
2572                 }
2573                 if (p_env->packing == DO_PACKED) {
2574                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2575                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2576
2577                 } else  {
2578                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2579                                 p_this_ccw->p_buffer, bytes_to_mov);
2580                 }
2581                 if (mtc_this_frm==0) {
2582                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2583                         skb=dev_alloc_skb(len_of_data);
2584                         if (skb) {
2585                                 memcpy(skb_put(skb,len_of_data),
2586                                         privptr->p_mtc_envelope,
2587                                         len_of_data);
2588                                 skb->dev=dev;
2589                                 skb_reset_mac_header(skb);
2590                                 skb->protocol=htons(ETH_P_IP);
2591                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2592                                 privptr->stats.rx_packets++;
2593                                 privptr->stats.rx_bytes+=len_of_data;
2594                                 netif_rx(skb);
2595                         }
2596                         else {
2597                                 privptr->stats.rx_dropped++;
2598                                 printk(KERN_WARNING "%s: %s() low on memory\n",
2599                                 dev->name,__func__);
2600                         }
2601                         privptr->mtc_offset=0;
2602                         privptr->mtc_logical_link=-1;
2603                 }
2604                 else {
2605                         privptr->mtc_offset+=bytes_to_mov;
2606                 }
2607                 if (p_env->packing == DO_PACKED)
2608                         goto unpack_next;
2609 NextFrame:
2610                 /*
2611                 *   Remove ThisCCWblock from active read queue, and add it
2612                 *   to queue of free blocks to be reused.
2613                 */
2614                 i++;
2615                 p_this_ccw->header.length=0xffff;
2616                 p_this_ccw->header.opcode=0xff;
2617                 /*
2618                 *       add this one to the free queue for later reuse
2619                 */
2620                 if (p_first_ccw==NULL) {
2621                         p_first_ccw = p_this_ccw;
2622                 }
2623                 else {
2624                         p_last_ccw->next = p_this_ccw;
2625                 }
2626                 p_last_ccw = p_this_ccw;
2627                 /*
2628                 *       chain to next block on active read queue
2629                 */
2630                 p_this_ccw = privptr->p_read_active_first;
2631                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2632         } /* end of while */
2633
2634         /*      check validity                  */
2635
2636         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2637         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2638         claw_strt_read(dev, LOCK_YES);
2639         return;
2640 }     /*  end of unpack_read   */
2641
2642 /*-------------------------------------------------------------------*
2643 *       claw_strt_read                                               *
2644 *                                                                    *
2645 *--------------------------------------------------------------------*/
2646 static void
2647 claw_strt_read (struct net_device *dev, int lock )
2648 {
2649         int        rc = 0;
2650         __u32      parm;
2651         unsigned long  saveflags = 0;
2652         struct claw_privbk *privptr = dev->ml_priv;
2653         struct ccwbk*p_ccwbk;
2654         struct chbk *p_ch;
2655         struct clawh *p_clawh;
2656         p_ch=&privptr->channel[READ];
2657
2658         CLAW_DBF_TEXT(4, trace, "StRdNter");
2659         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2660         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2661
2662         if ((privptr->p_write_active_first!=NULL &&
2663              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2664             (privptr->p_read_active_first!=NULL &&
2665              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2666                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2667         }
2668         if (lock==LOCK_YES) {
2669                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2670         }
2671         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2672                 CLAW_DBF_TEXT(4, trace, "HotRead");
2673                 p_ccwbk=privptr->p_read_active_first;
2674                 parm = (unsigned long) p_ch;
2675                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2676                                        0xff, 0);
2677                 if (rc != 0) {
2678                         ccw_check_return_code(p_ch->cdev, rc);
2679                 }
2680         }
2681         else {
2682                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2683         }
2684
2685         if (lock==LOCK_YES) {
2686                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2687         }
2688         CLAW_DBF_TEXT(4, trace, "StRdExit");
2689         return;
2690 }       /*    end of claw_strt_read    */
2691
2692 /*-------------------------------------------------------------------*
2693 *       claw_strt_out_IO                                             *
2694 *                                                                    *
2695 *--------------------------------------------------------------------*/
2696
2697 static void
2698 claw_strt_out_IO( struct net_device *dev )
2699 {
2700         int                     rc = 0;
2701         unsigned long           parm;
2702         struct claw_privbk      *privptr;
2703         struct chbk             *p_ch;
2704         struct ccwbk    *p_first_ccw;
2705
2706         if (!dev) {
2707                 return;
2708         }
2709         privptr = (struct claw_privbk *)dev->ml_priv;
2710         p_ch=&privptr->channel[WRITE];
2711
2712         CLAW_DBF_TEXT(4, trace, "strt_io");
2713         p_first_ccw=privptr->p_write_active_first;
2714
2715         if (p_ch->claw_state == CLAW_STOP)
2716                 return;
2717         if (p_first_ccw == NULL) {
2718                 return;
2719         }
2720         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2721                 parm = (unsigned long) p_ch;
2722                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2723                 rc = ccw_device_start (p_ch->cdev,&p_first_ccw->write, parm,
2724                                        0xff, 0);
2725                 if (rc != 0) {
2726                         ccw_check_return_code(p_ch->cdev, rc);
2727                 }
2728         }
2729         dev->trans_start = jiffies;
2730         return;
2731 }       /*    end of claw_strt_out_IO    */
2732
2733 /*-------------------------------------------------------------------*
2734 *       Free write buffers                                           *
2735 *                                                                    *
2736 *--------------------------------------------------------------------*/
2737
2738 static void
2739 claw_free_wrt_buf( struct net_device *dev )
2740 {
2741
2742         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2743         struct ccwbk*p_first_ccw;
2744         struct ccwbk*p_last_ccw;
2745         struct ccwbk*p_this_ccw;
2746         struct ccwbk*p_next_ccw;
2747
2748         CLAW_DBF_TEXT(4, trace, "freewrtb");
2749         /*  scan the write queue to free any completed write packets   */
2750         p_first_ccw=NULL;
2751         p_last_ccw=NULL;
2752         p_this_ccw=privptr->p_write_active_first;
2753         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2754         {
2755                 p_next_ccw = p_this_ccw->next;
2756                 if (((p_next_ccw!=NULL) &&
2757                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2758                     ((p_this_ccw == privptr->p_write_active_last) &&
2759                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2760                         /* The next CCW is OK or this is  */
2761                         /* the last CCW...free it   @A1A  */
2762                         privptr->p_write_active_first=p_this_ccw->next;
2763                         p_this_ccw->header.flag=CLAW_PENDING;
2764                         p_this_ccw->next=privptr->p_write_free_chain;
2765                         privptr->p_write_free_chain=p_this_ccw;
2766                         ++privptr->write_free_count;
2767                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2768                         p_this_ccw=privptr->p_write_active_first;
2769                         privptr->stats.tx_packets++;
2770                 }
2771                 else {
2772                         break;
2773                 }
2774         }
2775         if (privptr->write_free_count!=0) {
2776                 claw_clearbit_busy(TB_NOBUFFER,dev);
2777         }
2778         /*   whole chain removed?   */
2779         if (privptr->p_write_active_first==NULL) {
2780                 privptr->p_write_active_last=NULL;
2781         }
2782         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2783         return;
2784 }
2785
2786 /*-------------------------------------------------------------------*
2787 *       claw free netdevice                                          *
2788 *                                                                    *
2789 *--------------------------------------------------------------------*/
2790 static void
2791 claw_free_netdevice(struct net_device * dev, int free_dev)
2792 {
2793         struct claw_privbk *privptr;
2794
2795         CLAW_DBF_TEXT(2, setup, "free_dev");
2796         if (!dev)
2797                 return;
2798         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2799         privptr = dev->ml_priv;
2800         if (dev->flags & IFF_RUNNING)
2801                 claw_release(dev);
2802         if (privptr) {
2803                 privptr->channel[READ].ndev = NULL;  /* say it's free */
2804         }
2805         dev->ml_priv = NULL;
2806 #ifdef MODULE
2807         if (free_dev) {
2808                 free_netdev(dev);
2809         }
2810 #endif
2811         CLAW_DBF_TEXT(2, setup, "free_ok");
2812 }
2813
2814 /**
2815  * Claw init netdevice
2816  * Initialize everything of the net device except the name and the
2817  * channel structs.
2818  */
2819 static void
2820 claw_init_netdevice(struct net_device * dev)
2821 {
2822         CLAW_DBF_TEXT(2, setup, "init_dev");
2823         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2824         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2825         dev->hard_start_xmit = claw_tx;
2826         dev->open = claw_open;
2827         dev->stop = claw_release;
2828         dev->get_stats = claw_stats;
2829         dev->change_mtu = claw_change_mtu;
2830         dev->hard_header_len = 0;
2831         dev->addr_len = 0;
2832         dev->type = ARPHRD_SLIP;
2833         dev->tx_queue_len = 1300;
2834         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2835         CLAW_DBF_TEXT(2, setup, "initok");
2836         return;
2837 }
2838
2839 /**
2840  * Init a new channel in the privptr->channel[i].
2841  *
2842  * @param cdev  The ccw_device to be added.
2843  *
2844  * @return 0 on success, !0 on error.
2845  */
2846 static int
2847 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2848 {
2849         struct chbk *p_ch;
2850         struct ccw_dev_id dev_id;
2851
2852         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2853         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2854         p_ch = &privptr->channel[i];
2855         p_ch->cdev = cdev;
2856         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2857         ccw_device_get_id(cdev, &dev_id);
2858         p_ch->devno = dev_id.devno;
2859         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2860                 return -ENOMEM;
2861         }
2862         return 0;
2863 }
2864
2865
2866 /**
2867  *
2868  * Setup an interface.
2869  *
2870  * @param cgdev  Device to be setup.
2871  *
2872  * @returns 0 on success, !0 on failure.
2873  */
2874 static int
2875 claw_new_device(struct ccwgroup_device *cgdev)
2876 {
2877         struct claw_privbk *privptr;
2878         struct claw_env *p_env;
2879         struct net_device *dev;
2880         int ret;
2881         struct ccw_dev_id dev_id;
2882
2883         printk(KERN_INFO "claw: add for %s\n",
2884                dev_name(&cgdev->cdev[READ]->dev));
2885         CLAW_DBF_TEXT(2, setup, "new_dev");
2886         privptr = cgdev->dev.driver_data;
2887         cgdev->cdev[READ]->dev.driver_data = privptr;
2888         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2889         if (!privptr)
2890                 return -ENODEV;
2891         p_env = privptr->p_env;
2892         ccw_device_get_id(cgdev->cdev[READ], &dev_id);
2893         p_env->devno[READ] = dev_id.devno;
2894         ccw_device_get_id(cgdev->cdev[WRITE], &dev_id);
2895         p_env->devno[WRITE] = dev_id.devno;
2896         ret = add_channel(cgdev->cdev[0],0,privptr);
2897         if (ret == 0)
2898                 ret = add_channel(cgdev->cdev[1],1,privptr);
2899         if (ret != 0) {
2900                 printk(KERN_WARNING
2901                         "add channel failed with ret = %d\n", ret);
2902                 goto out;
2903         }
2904         ret = ccw_device_set_online(cgdev->cdev[READ]);
2905         if (ret != 0) {
2906                 printk(KERN_WARNING
2907                         "claw: ccw_device_set_online %s READ failed "
2908                        "with ret = %d\n", dev_name(&cgdev->cdev[READ]->dev),
2909                        ret);
2910                 goto out;
2911         }
2912         ret = ccw_device_set_online(cgdev->cdev[WRITE]);
2913         if (ret != 0) {
2914                 printk(KERN_WARNING
2915                         "claw: ccw_device_set_online %s WRITE failed "
2916                        "with ret = %d\n", dev_name(&cgdev->cdev[WRITE]->dev)
2917                        ret);
2918                 goto out;
2919         }
2920         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2921         if (!dev) {
2922                 printk(KERN_WARNING "%s:alloc_netdev failed\n",__func__);
2923                 goto out;
2924         }
2925         dev->ml_priv = privptr;
2926         cgdev->dev.driver_data = privptr;
2927         cgdev->cdev[READ]->dev.driver_data = privptr;
2928         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2929         /* sysfs magic */
2930         SET_NETDEV_DEV(dev, &cgdev->dev);
2931         if (register_netdev(dev) != 0) {
2932                 claw_free_netdevice(dev, 1);
2933                 CLAW_DBF_TEXT(2, trace, "regfail");
2934                 goto out;
2935         }
2936         dev->flags &=~IFF_RUNNING;
2937         if (privptr->buffs_alloc == 0) {
2938                 ret=init_ccw_bk(dev);
2939                 if (ret !=0) {
2940                         unregister_netdev(dev);
2941                         claw_free_netdevice(dev,1);
2942                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2943                         goto out;
2944                 }
2945         }
2946         privptr->channel[READ].ndev = dev;
2947         privptr->channel[WRITE].ndev = dev;
2948         privptr->p_env->ndev = dev;
2949
2950         printk(KERN_INFO "%s:readsize=%d  writesize=%d "
2951                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2952                 dev->name, p_env->read_size,
2953                 p_env->write_size, p_env->read_buffers,
2954                 p_env->write_buffers, p_env->devno[READ],
2955                 p_env->devno[WRITE]);
2956         printk(KERN_INFO "%s:host_name:%.8s, adapter_name "
2957                 ":%.8s api_type: %.8s\n",
2958                 dev->name, p_env->host_name,
2959                 p_env->adapter_name , p_env->api_type);
2960         return 0;
2961 out:
2962         ccw_device_set_offline(cgdev->cdev[1]);
2963         ccw_device_set_offline(cgdev->cdev[0]);
2964         return -ENODEV;
2965 }
2966
2967 static void
2968 claw_purge_skb_queue(struct sk_buff_head *q)
2969 {
2970         struct sk_buff *skb;
2971
2972         CLAW_DBF_TEXT(4, trace, "purgque");
2973         while ((skb = skb_dequeue(q))) {
2974                 atomic_dec(&skb->users);
2975                 dev_kfree_skb_any(skb);
2976         }
2977 }
2978
2979 /**
2980  * Shutdown an interface.
2981  *
2982  * @param cgdev  Device to be shut down.
2983  *
2984  * @returns 0 on success, !0 on failure.
2985  */
2986 static int
2987 claw_shutdown_device(struct ccwgroup_device *cgdev)
2988 {
2989         struct claw_privbk *priv;
2990         struct net_device *ndev;
2991         int     ret;
2992
2993         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2994         priv = cgdev->dev.driver_data;
2995         if (!priv)
2996                 return -ENODEV;
2997         ndev = priv->channel[READ].ndev;
2998         if (ndev) {
2999                 /* Close the device */
3000                 printk(KERN_INFO
3001                         "%s: shuting down \n",ndev->name);
3002                 if (ndev->flags & IFF_RUNNING)
3003                         ret = claw_release(ndev);
3004                 ndev->flags &=~IFF_RUNNING;
3005                 unregister_netdev(ndev);
3006                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3007                 claw_free_netdevice(ndev, 1);
3008                 priv->channel[READ].ndev = NULL;
3009                 priv->channel[WRITE].ndev = NULL;
3010                 priv->p_env->ndev = NULL;
3011         }
3012         ccw_device_set_offline(cgdev->cdev[1]);
3013         ccw_device_set_offline(cgdev->cdev[0]);
3014         return 0;
3015 }
3016
3017 static void
3018 claw_remove_device(struct ccwgroup_device *cgdev)
3019 {
3020         struct claw_privbk *priv;
3021
3022         BUG_ON(!cgdev);
3023         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3024         priv = cgdev->dev.driver_data;
3025         BUG_ON(!priv);
3026         printk(KERN_INFO "claw: %s() called %s will be removed.\n",
3027                         __func__, dev_name(&cgdev->cdev[0]->dev));
3028         if (cgdev->state == CCWGROUP_ONLINE)
3029                 claw_shutdown_device(cgdev);
3030         claw_remove_files(&cgdev->dev);
3031         kfree(priv->p_mtc_envelope);
3032         priv->p_mtc_envelope=NULL;
3033         kfree(priv->p_env);
3034         priv->p_env=NULL;
3035         kfree(priv->channel[0].irb);
3036         priv->channel[0].irb=NULL;
3037         kfree(priv->channel[1].irb);
3038         priv->channel[1].irb=NULL;
3039         kfree(priv);
3040         cgdev->dev.driver_data=NULL;
3041         cgdev->cdev[READ]->dev.driver_data = NULL;
3042         cgdev->cdev[WRITE]->dev.driver_data = NULL;
3043         put_device(&cgdev->dev);
3044
3045         return;
3046 }
3047
3048
3049 /*
3050  * sysfs attributes
3051  */
3052 static ssize_t
3053 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3054 {
3055         struct claw_privbk *priv;
3056         struct claw_env *  p_env;
3057
3058         priv = dev->driver_data;
3059         if (!priv)
3060                 return -ENODEV;
3061         p_env = priv->p_env;
3062         return sprintf(buf, "%s\n",p_env->host_name);
3063 }
3064
3065 static ssize_t
3066 claw_hname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3067 {
3068         struct claw_privbk *priv;
3069         struct claw_env *  p_env;
3070
3071         priv = dev->driver_data;
3072         if (!priv)
3073                 return -ENODEV;
3074         p_env = priv->p_env;
3075         if (count > MAX_NAME_LEN+1)
3076                 return -EINVAL;
3077         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3078         strncpy(p_env->host_name,buf, count);
3079         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3080         p_env->host_name[MAX_NAME_LEN] = 0x00;
3081         CLAW_DBF_TEXT(2, setup, "HstnSet");
3082         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3083
3084         return count;
3085 }
3086
3087 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3088
3089 static ssize_t
3090 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3091 {
3092         struct claw_privbk *priv;
3093         struct claw_env *  p_env;
3094
3095         priv = dev->driver_data;
3096         if (!priv)
3097                 return -ENODEV;
3098         p_env = priv->p_env;
3099         return sprintf(buf, "%s\n", p_env->adapter_name);
3100 }
3101
3102 static ssize_t
3103 claw_adname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3104 {
3105         struct claw_privbk *priv;
3106         struct claw_env *  p_env;
3107
3108         priv = dev->driver_data;
3109         if (!priv)
3110                 return -ENODEV;
3111         p_env = priv->p_env;
3112         if (count > MAX_NAME_LEN+1)
3113                 return -EINVAL;
3114         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3115         strncpy(p_env->adapter_name,buf, count);
3116         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3117         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3118         CLAW_DBF_TEXT(2, setup, "AdnSet");
3119         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3120
3121         return count;
3122 }
3123
3124 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3125
3126 static ssize_t
3127 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3128 {
3129         struct claw_privbk *priv;
3130         struct claw_env *  p_env;
3131
3132         priv = dev->driver_data;
3133         if (!priv)
3134                 return -ENODEV;
3135         p_env = priv->p_env;
3136         return sprintf(buf, "%s\n",
3137                        p_env->api_type);
3138 }
3139
3140 static ssize_t
3141 claw_apname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3142 {
3143         struct claw_privbk *priv;
3144         struct claw_env *  p_env;
3145
3146         priv = dev->driver_data;
3147         if (!priv)
3148                 return -ENODEV;
3149         p_env = priv->p_env;
3150         if (count > MAX_NAME_LEN+1)
3151                 return -EINVAL;
3152         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3153         strncpy(p_env->api_type,buf, count);
3154         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3155         p_env->api_type[MAX_NAME_LEN] = 0x00;
3156         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3157                 p_env->read_size=DEF_PACK_BUFSIZE;
3158                 p_env->write_size=DEF_PACK_BUFSIZE;
3159                 p_env->packing=PACKING_ASK;
3160                 CLAW_DBF_TEXT(2, setup, "PACKING");
3161         }
3162         else {
3163                 p_env->packing=0;
3164                 p_env->read_size=CLAW_FRAME_SIZE;
3165                 p_env->write_size=CLAW_FRAME_SIZE;
3166                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3167         }
3168         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3169         return count;
3170 }
3171
3172 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3173
3174 static ssize_t
3175 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3176 {
3177         struct claw_privbk *priv;
3178         struct claw_env * p_env;
3179
3180         priv = dev->driver_data;
3181         if (!priv)
3182                 return -ENODEV;
3183         p_env = priv->p_env;
3184         return sprintf(buf, "%d\n", p_env->write_buffers);
3185 }
3186
3187 static ssize_t
3188 claw_wbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3189 {
3190         struct claw_privbk *priv;
3191         struct claw_env *  p_env;
3192         int nnn,max;
3193
3194         priv = dev->driver_data;
3195         if (!priv)
3196                 return -ENODEV;
3197         p_env = priv->p_env;
3198         sscanf(buf, "%i", &nnn);
3199         if (p_env->packing) {
3200                 max = 64;
3201         }
3202         else {
3203                 max = 512;
3204         }
3205         if ((nnn > max ) || (nnn < 2))
3206                 return -EINVAL;
3207         p_env->write_buffers = nnn;
3208         CLAW_DBF_TEXT(2, setup, "Wbufset");
3209         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3210         return count;
3211 }
3212
3213 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3214
3215 static ssize_t
3216 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3217 {
3218         struct claw_privbk *priv;
3219         struct claw_env *  p_env;
3220
3221         priv = dev->driver_data;
3222         if (!priv)
3223                 return -ENODEV;
3224         p_env = priv->p_env;
3225         return sprintf(buf, "%d\n", p_env->read_buffers);
3226 }
3227
3228 static ssize_t
3229 claw_rbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3230 {
3231         struct claw_privbk *priv;
3232         struct claw_env *p_env;
3233         int nnn,max;
3234
3235         priv = dev->driver_data;
3236         if (!priv)
3237                 return -ENODEV;
3238         p_env = priv->p_env;
3239         sscanf(buf, "%i", &nnn);
3240         if (p_env->packing) {
3241                 max = 64;
3242         }
3243         else {
3244                 max = 512;
3245         }
3246         if ((nnn > max ) || (nnn < 2))
3247                 return -EINVAL;
3248         p_env->read_buffers = nnn;
3249         CLAW_DBF_TEXT(2, setup, "Rbufset");
3250         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3251         return count;
3252 }
3253
3254 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3255
3256 static struct attribute *claw_attr[] = {
3257         &dev_attr_read_buffer.attr,
3258         &dev_attr_write_buffer.attr,
3259         &dev_attr_adapter_name.attr,
3260         &dev_attr_api_type.attr,
3261         &dev_attr_host_name.attr,
3262         NULL,
3263 };
3264
3265 static struct attribute_group claw_attr_group = {
3266         .attrs = claw_attr,
3267 };
3268
3269 static int
3270 claw_add_files(struct device *dev)
3271 {
3272         CLAW_DBF_TEXT(2, setup, "add_file");
3273         return sysfs_create_group(&dev->kobj, &claw_attr_group);
3274 }
3275
3276 static void
3277 claw_remove_files(struct device *dev)
3278 {
3279         CLAW_DBF_TEXT(2, setup, "rem_file");
3280         sysfs_remove_group(&dev->kobj, &claw_attr_group);
3281 }
3282
3283 /*--------------------------------------------------------------------*
3284 *    claw_init  and cleanup                                           *
3285 *---------------------------------------------------------------------*/
3286
3287 static void __exit
3288 claw_cleanup(void)
3289 {
3290         unregister_cu3088_discipline(&claw_group_driver);
3291         claw_unregister_debug_facility();
3292         printk(KERN_INFO "claw: Driver unloaded\n");
3293
3294 }
3295
3296 /**
3297  * Initialize module.
3298  * This is called just after the module is loaded.
3299  *
3300  * @return 0 on success, !0 on error.
3301  */
3302 static int __init
3303 claw_init(void)
3304 {
3305         int ret = 0;
3306         printk(KERN_INFO "claw: starting driver\n");
3307
3308         ret = claw_register_debug_facility();
3309         if (ret) {
3310                 printk(KERN_WARNING "claw: %s() debug_register failed %d\n",
3311                         __func__,ret);
3312                 return ret;
3313         }
3314         CLAW_DBF_TEXT(2, setup, "init_mod");
3315         ret = register_cu3088_discipline(&claw_group_driver);
3316         if (ret) {
3317                 CLAW_DBF_TEXT(2, setup, "init_bad");
3318                 claw_unregister_debug_facility();
3319                 printk(KERN_WARNING "claw; %s() cu3088 register failed %d\n",
3320                         __func__,ret);
3321         }
3322         return ret;
3323 }
3324
3325 module_init(claw_init);
3326 module_exit(claw_cleanup);
3327
3328 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3329 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3330                         "Copyright 2000,2008 IBM Corporation\n");
3331 MODULE_LICENSE("GPL");