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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                         cgdev->cdev[0]->dev.bus_id,__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                        cdev->dev.bus_id, 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", cdev->dev.bus_id);
 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                                 cdev->dev.bus_id,
 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", cdev->dev.bus_id);
1140                         break;
1141                 case -EIO:
1142                         printk(KERN_EMERG "%s: Status pending... EIO \n",
1143                                 cdev->dev.bus_id);
1144                         break;
1145                 case -EINVAL:
1146                         printk(KERN_EMERG "%s: Invalid Dev State EINVAL \n",
1147                                 cdev->dev.bus_id);
1148                         break;
1149                 default:
1150                         printk(KERN_EMERG "%s: Unknown error in "
1151                                  "Do_IO %d\n",cdev->dev.bus_id, return_code);
1152                 }
1153         }
1154         CLAW_DBF_TEXT(4, trace, "ccwret");
1155 }    /*    end of ccw_check_return_code   */
1156
1157 /*-------------------------------------------------------------------*
1158 *       ccw_check_unit_check                                         *
1159 *--------------------------------------------------------------------*/
1160
1161 static void
1162 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1163 {
1164         struct net_device *ndev = p_ch->ndev;
1165
1166         CLAW_DBF_TEXT(4, trace, "unitchek");
1167         printk(KERN_INFO "%s: Unit Check with sense byte:0x%04x\n",
1168                ndev->name, sense);
1169
1170         if (sense & 0x40) {
1171                 if (sense & 0x01) {
1172                         printk(KERN_WARNING "%s: Interface disconnect or "
1173                                 "Selective reset "
1174                                 "occurred (remote side)\n", ndev->name);
1175                 }
1176                 else {
1177                         printk(KERN_WARNING "%s: System reset occured"
1178                                 " (remote side)\n", ndev->name);
1179                 }
1180         }
1181         else if (sense & 0x20) {
1182                 if (sense & 0x04) {
1183                         printk(KERN_WARNING "%s: Data-streaming "
1184                                 "timeout)\n", ndev->name);
1185                 }
1186                 else  {
1187                         printk(KERN_WARNING "%s: Data-transfer parity"
1188                                 " error\n", ndev->name);
1189                 }
1190         }
1191         else if (sense & 0x10) {
1192                 if (sense & 0x20) {
1193                         printk(KERN_WARNING "%s: Hardware malfunction "
1194                                 "(remote side)\n", ndev->name);
1195                 }
1196                 else {
1197                         printk(KERN_WARNING "%s: read-data parity error "
1198                                 "(remote side)\n", ndev->name);
1199                 }
1200         }
1201
1202 }   /*    end of ccw_check_unit_check    */
1203
1204 /*-------------------------------------------------------------------*
1205 *               find_link                                            *
1206 *--------------------------------------------------------------------*/
1207 static int
1208 find_link(struct net_device *dev, char *host_name, char *ws_name )
1209 {
1210         struct claw_privbk *privptr;
1211         struct claw_env *p_env;
1212         int    rc=0;
1213
1214         CLAW_DBF_TEXT(2, setup, "findlink");
1215         privptr = dev->ml_priv;
1216         p_env=privptr->p_env;
1217         switch (p_env->packing)
1218         {
1219                 case  PACKING_ASK:
1220                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1221                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1222                              rc = EINVAL;
1223                         break;
1224                 case  DO_PACKED:
1225                 case  PACK_SEND:
1226                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1227                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1228                                 rc = EINVAL;
1229                         break;
1230                 default:
1231                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1232                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1233                                 rc = EINVAL;
1234                         break;
1235         }
1236
1237         return 0;
1238 }    /*    end of find_link    */
1239
1240 /*-------------------------------------------------------------------*
1241  *   claw_hw_tx                                                      *
1242  *                                                                   *
1243  *                                                                   *
1244  *-------------------------------------------------------------------*/
1245
1246 static int
1247 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1248 {
1249         int                             rc=0;
1250         struct claw_privbk              *privptr;
1251         struct ccwbk           *p_this_ccw;
1252         struct ccwbk           *p_first_ccw;
1253         struct ccwbk           *p_last_ccw;
1254         __u32                           numBuffers;
1255         signed long                     len_of_data;
1256         unsigned long                   bytesInThisBuffer;
1257         unsigned char                   *pDataAddress;
1258         struct endccw                   *pEnd;
1259         struct ccw1                     tempCCW;
1260         struct chbk                     *p_ch;
1261         struct claw_env                 *p_env;
1262         int                             lock;
1263         struct clawph                   *pk_head;
1264         struct chbk                     *ch;
1265
1266         CLAW_DBF_TEXT(4, trace, "hw_tx");
1267         privptr = (struct claw_privbk *)(dev->ml_priv);
1268         p_ch=(struct chbk *)&privptr->channel[WRITE];
1269         p_env =privptr->p_env;
1270         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1271         /*  scan the write queue to free any completed write packets   */
1272         p_first_ccw=NULL;
1273         p_last_ccw=NULL;
1274         if ((p_env->packing >= PACK_SEND) &&
1275             (skb->cb[1] != 'P')) {
1276                 skb_push(skb,sizeof(struct clawph));
1277                 pk_head=(struct clawph *)skb->data;
1278                 pk_head->len=skb->len-sizeof(struct clawph);
1279                 if (pk_head->len%4)  {
1280                         pk_head->len+= 4-(pk_head->len%4);
1281                         skb_pad(skb,4-(pk_head->len%4));
1282                         skb_put(skb,4-(pk_head->len%4));
1283                 }
1284                 if (p_env->packing == DO_PACKED)
1285                         pk_head->link_num = linkid;
1286                 else
1287                         pk_head->link_num = 0;
1288                 pk_head->flag = 0x00;
1289                 skb_pad(skb,4);
1290                 skb->cb[1] = 'P';
1291         }
1292         if (linkid == 0) {
1293                 if (claw_check_busy(dev)) {
1294                         if (privptr->write_free_count!=0) {
1295                                 claw_clear_busy(dev);
1296                         }
1297                         else {
1298                                 claw_strt_out_IO(dev );
1299                                 claw_free_wrt_buf( dev );
1300                                 if (privptr->write_free_count==0) {
1301                                         ch = &privptr->channel[WRITE];
1302                                         atomic_inc(&skb->users);
1303                                         skb_queue_tail(&ch->collect_queue, skb);
1304                                         goto Done;
1305                                 }
1306                                 else {
1307                                         claw_clear_busy(dev);
1308                                 }
1309                         }
1310                 }
1311                 /*  tx lock  */
1312                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1313                         ch = &privptr->channel[WRITE];
1314                         atomic_inc(&skb->users);
1315                         skb_queue_tail(&ch->collect_queue, skb);
1316                         claw_strt_out_IO(dev );
1317                         rc=-EBUSY;
1318                         goto Done2;
1319                 }
1320         }
1321         /*      See how many write buffers are required to hold this data */
1322         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1323
1324         /*      If that number of buffers isn't available, give up for now */
1325         if (privptr->write_free_count < numBuffers ||
1326             privptr->p_write_free_chain == NULL ) {
1327
1328                 claw_setbit_busy(TB_NOBUFFER,dev);
1329                 ch = &privptr->channel[WRITE];
1330                 atomic_inc(&skb->users);
1331                 skb_queue_tail(&ch->collect_queue, skb);
1332                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1333                 goto Done2;
1334         }
1335         pDataAddress=skb->data;
1336         len_of_data=skb->len;
1337
1338         while (len_of_data > 0) {
1339                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1340                 if (p_this_ccw == NULL) { /* lost the race */
1341                         ch = &privptr->channel[WRITE];
1342                         atomic_inc(&skb->users);
1343                         skb_queue_tail(&ch->collect_queue, skb);
1344                         goto Done2;
1345                 }
1346                 privptr->p_write_free_chain=p_this_ccw->next;
1347                 p_this_ccw->next=NULL;
1348                 --privptr->write_free_count; /* -1 */
1349                 bytesInThisBuffer=len_of_data;
1350                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1351                 len_of_data-=bytesInThisBuffer;
1352                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1353                 /*      setup write CCW         */
1354                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1355                 if (len_of_data>0) {
1356                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1357                 }
1358                 p_this_ccw->write.count=bytesInThisBuffer;
1359                 /*      now add to end of this chain    */
1360                 if (p_first_ccw==NULL)    {
1361                         p_first_ccw=p_this_ccw;
1362                 }
1363                 if (p_last_ccw!=NULL) {
1364                         p_last_ccw->next=p_this_ccw;
1365                         /*      set up TIC ccws         */
1366                         p_last_ccw->w_TIC_1.cda=
1367                                 (__u32)__pa(&p_this_ccw->write);
1368                 }
1369                 p_last_ccw=p_this_ccw;      /* save new last block */
1370         }
1371
1372         /*      FirstCCW and LastCCW now contain a new set of write channel
1373         *       programs to append to the running channel program
1374         */
1375
1376         if (p_first_ccw!=NULL) {
1377                 /*      setup ending ccw sequence for this segment              */
1378                 pEnd=privptr->p_end_ccw;
1379                 if (pEnd->write1) {
1380                         pEnd->write1=0x00;   /* second end ccw is now active */
1381                         /*      set up Tic CCWs         */
1382                         p_last_ccw->w_TIC_1.cda=
1383                                 (__u32)__pa(&pEnd->write2_nop1);
1384                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1385                         pEnd->write2_nop2.flags    =
1386                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1387                         pEnd->write2_nop2.cda=0;
1388                         pEnd->write2_nop2.count=1;
1389                 }
1390                 else {  /*  end of if (pEnd->write1)*/
1391                         pEnd->write1=0x01;   /* first end ccw is now active */
1392                         /*      set up Tic CCWs         */
1393                         p_last_ccw->w_TIC_1.cda=
1394                                 (__u32)__pa(&pEnd->write1_nop1);
1395                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1396                         pEnd->write1_nop2.flags    =
1397                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1398                         pEnd->write1_nop2.cda=0;
1399                         pEnd->write1_nop2.count=1;
1400                 }  /* end if if (pEnd->write1) */
1401
1402                 if (privptr->p_write_active_first==NULL ) {
1403                         privptr->p_write_active_first=p_first_ccw;
1404                         privptr->p_write_active_last=p_last_ccw;
1405                 }
1406                 else {
1407                         /*      set up Tic CCWs         */
1408
1409                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1410                         tempCCW.count=0;
1411                         tempCCW.flags=0;
1412                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1413
1414                         if (pEnd->write1) {
1415
1416                  /*
1417                  * first set of ending CCW's is chained to the new write
1418                  * chain, so the second set is chained to the active chain
1419                  * Therefore modify the second set to point the new write chain.
1420                  * make sure we update the CCW atomically
1421                  * so channel does not fetch it when it's only half done
1422                  */
1423                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1424                                         sizeof(struct ccw1));
1425                                 privptr->p_write_active_last->w_TIC_1.cda=
1426                                         (__u32)__pa(&p_first_ccw->write);
1427                         }
1428                         else {
1429
1430                         /*make sure we update the CCW atomically
1431                          *so channel does not fetch it when it's only half done
1432                          */
1433                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1434                                         sizeof(struct ccw1));
1435                                 privptr->p_write_active_last->w_TIC_1.cda=
1436                                         (__u32)__pa(&p_first_ccw->write);
1437
1438                         } /* end if if (pEnd->write1) */
1439
1440                         privptr->p_write_active_last->next=p_first_ccw;
1441                         privptr->p_write_active_last=p_last_ccw;
1442                 }
1443
1444         } /* endif (p_first_ccw!=NULL)  */
1445         dev_kfree_skb_any(skb);
1446         if (linkid==0) {
1447                 lock=LOCK_NO;
1448         }
1449         else  {
1450                 lock=LOCK_YES;
1451         }
1452         claw_strt_out_IO(dev );
1453         /*      if write free count is zero , set NOBUFFER       */
1454         if (privptr->write_free_count==0) {
1455                 claw_setbit_busy(TB_NOBUFFER,dev);
1456         }
1457 Done2:
1458         claw_clearbit_busy(TB_TX,dev);
1459 Done:
1460         return(rc);
1461 }    /*    end of claw_hw_tx    */
1462
1463 /*-------------------------------------------------------------------*
1464 *                                                                    *
1465 *     init_ccw_bk                                                    *
1466 *                                                                    *
1467 *--------------------------------------------------------------------*/
1468
1469 static int
1470 init_ccw_bk(struct net_device *dev)
1471 {
1472
1473         __u32   ccw_blocks_required;
1474         __u32   ccw_blocks_perpage;
1475         __u32   ccw_pages_required;
1476         __u32   claw_reads_perpage=1;
1477         __u32   claw_read_pages;
1478         __u32   claw_writes_perpage=1;
1479         __u32   claw_write_pages;
1480         void    *p_buff=NULL;
1481         struct ccwbk*p_free_chain;
1482         struct ccwbk*p_buf;
1483         struct ccwbk*p_last_CCWB;
1484         struct ccwbk*p_first_CCWB;
1485         struct endccw *p_endccw=NULL;
1486         addr_t  real_address;
1487         struct claw_privbk *privptr = dev->ml_priv;
1488         struct clawh *pClawH=NULL;
1489         addr_t   real_TIC_address;
1490         int i,j;
1491         CLAW_DBF_TEXT(4, trace, "init_ccw");
1492
1493         /*  initialize  statistics field */
1494         privptr->active_link_ID=0;
1495         /*  initialize  ccwbk pointers  */
1496         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1497         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1498         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1499         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1500         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1501         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1502         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1503         privptr->buffs_alloc = 0;
1504         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1505         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1506         /*  initialize  free write ccwbk counter  */
1507         privptr->write_free_count=0;  /* number of free bufs on write chain */
1508         p_last_CCWB = NULL;
1509         p_first_CCWB= NULL;
1510         /*
1511         *  We need 1 CCW block for each read buffer, 1 for each
1512         *  write buffer, plus 1 for ClawSignalBlock
1513         */
1514         ccw_blocks_required =
1515                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1516         /*
1517         * compute number of CCW blocks that will fit in a page
1518         */
1519         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1520         ccw_pages_required=
1521                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1522
1523         /*
1524          *  read and write sizes are set by 2 constants in claw.h
1525          *  4k and 32k.  Unpacked values other than 4k are not going to
1526          * provide good performance. With packing buffers support 32k
1527          * buffers are used.
1528          */
1529         if (privptr->p_env->read_size < PAGE_SIZE) {
1530                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1531                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1532                                                 claw_reads_perpage);
1533          }
1534          else {       /* > or equal  */
1535                 privptr->p_buff_pages_perread =
1536                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1537                 claw_read_pages = privptr->p_env->read_buffers *
1538                                         privptr->p_buff_pages_perread;
1539          }
1540         if (privptr->p_env->write_size < PAGE_SIZE) {
1541                 claw_writes_perpage =
1542                         PAGE_SIZE / privptr->p_env->write_size;
1543                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1544                                                 claw_writes_perpage);
1545
1546         }
1547         else {      /* >  or equal  */
1548                 privptr->p_buff_pages_perwrite =
1549                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1550                 claw_write_pages = privptr->p_env->write_buffers *
1551                                         privptr->p_buff_pages_perwrite;
1552         }
1553         /*
1554         *               allocate ccw_pages_required
1555         */
1556         if (privptr->p_buff_ccw==NULL) {
1557                 privptr->p_buff_ccw=
1558                         (void *)__get_free_pages(__GFP_DMA,
1559                         (int)pages_to_order_of_mag(ccw_pages_required ));
1560                 if (privptr->p_buff_ccw==NULL) {
1561                         return -ENOMEM;
1562                 }
1563                 privptr->p_buff_ccw_num=ccw_pages_required;
1564         }
1565         memset(privptr->p_buff_ccw, 0x00,
1566                 privptr->p_buff_ccw_num * PAGE_SIZE);
1567
1568         /*
1569         *               obtain ending ccw block address
1570         *
1571         */
1572         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1573         real_address  = (__u32)__pa(privptr->p_end_ccw);
1574         /*                              Initialize ending CCW block       */
1575         p_endccw=privptr->p_end_ccw;
1576         p_endccw->real=real_address;
1577         p_endccw->write1=0x00;
1578         p_endccw->read1=0x00;
1579
1580         /*      write1_nop1                                     */
1581         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1582         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1583         p_endccw->write1_nop1.count       = 1;
1584         p_endccw->write1_nop1.cda         = 0;
1585
1586         /*      write1_nop2                                     */
1587         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1588         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1589         p_endccw->write1_nop2.count      = 1;
1590         p_endccw->write1_nop2.cda        = 0;
1591
1592         /*      write2_nop1                                     */
1593         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1594         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1595         p_endccw->write2_nop1.count        = 1;
1596         p_endccw->write2_nop1.cda          = 0;
1597
1598         /*      write2_nop2                                     */
1599         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1600         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1601         p_endccw->write2_nop2.count        = 1;
1602         p_endccw->write2_nop2.cda          = 0;
1603
1604         /*      read1_nop1                                      */
1605         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1606         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1607         p_endccw->read1_nop1.count        = 1;
1608         p_endccw->read1_nop1.cda          = 0;
1609
1610         /*      read1_nop2                                      */
1611         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1612         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1613         p_endccw->read1_nop2.count        = 1;
1614         p_endccw->read1_nop2.cda          = 0;
1615
1616         /*      read2_nop1                                      */
1617         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1618         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1619         p_endccw->read2_nop1.count        = 1;
1620         p_endccw->read2_nop1.cda          = 0;
1621
1622         /*      read2_nop2                                      */
1623         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1624         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1625         p_endccw->read2_nop2.count        = 1;
1626         p_endccw->read2_nop2.cda          = 0;
1627
1628         /*
1629         *                               Build a chain of CCWs
1630         *
1631         */
1632         p_buff=privptr->p_buff_ccw;
1633
1634         p_free_chain=NULL;
1635         for (i=0 ; i < ccw_pages_required; i++ ) {
1636                 real_address  = (__u32)__pa(p_buff);
1637                 p_buf=p_buff;
1638                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1639                         p_buf->next  = p_free_chain;
1640                         p_free_chain = p_buf;
1641                         p_buf->real=(__u32)__pa(p_buf);
1642                         ++p_buf;
1643                 }
1644                 p_buff+=PAGE_SIZE;
1645         }
1646         /*
1647         *                               Initialize ClawSignalBlock
1648         *
1649         */
1650         if (privptr->p_claw_signal_blk==NULL) {
1651                 privptr->p_claw_signal_blk=p_free_chain;
1652                 p_free_chain=p_free_chain->next;
1653                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1654                 pClawH->length=0xffff;
1655                 pClawH->opcode=0xff;
1656                 pClawH->flag=CLAW_BUSY;
1657         }
1658
1659         /*
1660         *               allocate write_pages_required and add to free chain
1661         */
1662         if (privptr->p_buff_write==NULL) {
1663             if (privptr->p_env->write_size < PAGE_SIZE) {
1664                 privptr->p_buff_write=
1665                         (void *)__get_free_pages(__GFP_DMA,
1666                         (int)pages_to_order_of_mag(claw_write_pages ));
1667                 if (privptr->p_buff_write==NULL) {
1668                         privptr->p_buff_ccw=NULL;
1669                         return -ENOMEM;
1670                 }
1671                 /*
1672                 *                               Build CLAW write free chain
1673                 *
1674                 */
1675
1676                 memset(privptr->p_buff_write, 0x00,
1677                         ccw_pages_required * PAGE_SIZE);
1678                 privptr->p_write_free_chain=NULL;
1679
1680                 p_buff=privptr->p_buff_write;
1681
1682                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1683                         p_buf        = p_free_chain;      /*  get a CCW */
1684                         p_free_chain = p_buf->next;
1685                         p_buf->next  =privptr->p_write_free_chain;
1686                         privptr->p_write_free_chain = p_buf;
1687                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1688                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1689                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1690                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1691                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1692                         p_buf-> w_read_FF.count   = 1;
1693                         p_buf-> w_read_FF.cda     =
1694                                 (__u32)__pa(&p_buf-> header.flag);
1695                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1696                         p_buf-> w_TIC_1.flags      = 0;
1697                         p_buf-> w_TIC_1.count      = 0;
1698
1699                         if (((unsigned long)p_buff+privptr->p_env->write_size) >=
1700                            ((unsigned long)(p_buff+2*
1701                                 (privptr->p_env->write_size) -1) & PAGE_MASK)) {
1702                         p_buff= p_buff+privptr->p_env->write_size;
1703                         }
1704                 }
1705            }
1706            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1707            {
1708                privptr->p_write_free_chain=NULL;
1709                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1710                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1711                         (int)pages_to_order_of_mag(
1712                         privptr->p_buff_pages_perwrite) );
1713                    if (p_buff==NULL) {
1714                         free_pages((unsigned long)privptr->p_buff_ccw,
1715                               (int)pages_to_order_of_mag(
1716                                         privptr->p_buff_ccw_num));
1717                         privptr->p_buff_ccw=NULL;
1718                         p_buf=privptr->p_buff_write;
1719                         while (p_buf!=NULL) {
1720                                 free_pages((unsigned long)
1721                                         p_buf->p_buffer,
1722                                         (int)pages_to_order_of_mag(
1723                                         privptr->p_buff_pages_perwrite));
1724                                 p_buf=p_buf->next;
1725                         }
1726                         return -ENOMEM;
1727                    }  /* Error on get_pages   */
1728                    memset(p_buff, 0x00, privptr->p_env->write_size );
1729                    p_buf         = p_free_chain;
1730                    p_free_chain  = p_buf->next;
1731                    p_buf->next   = privptr->p_write_free_chain;
1732                    privptr->p_write_free_chain = p_buf;
1733                    privptr->p_buff_write = p_buf;
1734                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1735                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1736                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1737                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1738                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1739                    p_buf-> w_read_FF.count    = 1;
1740                    p_buf-> w_read_FF.cda      =
1741                         (__u32)__pa(&p_buf-> header.flag);
1742                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1743                    p_buf-> w_TIC_1.flags   = 0;
1744                    p_buf-> w_TIC_1.count   = 0;
1745                }  /* for all write_buffers   */
1746
1747            }    /* else buffers are PAGE_SIZE or bigger */
1748
1749         }
1750         privptr->p_buff_write_num=claw_write_pages;
1751         privptr->write_free_count=privptr->p_env->write_buffers;
1752
1753
1754         /*
1755         *               allocate read_pages_required and chain to free chain
1756         */
1757         if (privptr->p_buff_read==NULL) {
1758             if (privptr->p_env->read_size < PAGE_SIZE)  {
1759                 privptr->p_buff_read=
1760                         (void *)__get_free_pages(__GFP_DMA,
1761                         (int)pages_to_order_of_mag(claw_read_pages) );
1762                 if (privptr->p_buff_read==NULL) {
1763                         free_pages((unsigned long)privptr->p_buff_ccw,
1764                                 (int)pages_to_order_of_mag(
1765                                         privptr->p_buff_ccw_num));
1766                         /* free the write pages size is < page size  */
1767                         free_pages((unsigned long)privptr->p_buff_write,
1768                                 (int)pages_to_order_of_mag(
1769                                 privptr->p_buff_write_num));
1770                         privptr->p_buff_ccw=NULL;
1771                         privptr->p_buff_write=NULL;
1772                         return -ENOMEM;
1773                 }
1774                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1775                 privptr->p_buff_read_num=claw_read_pages;
1776                 /*
1777                 *                               Build CLAW read free chain
1778                 *
1779                 */
1780                 p_buff=privptr->p_buff_read;
1781                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1782                         p_buf        = p_free_chain;
1783                         p_free_chain = p_buf->next;
1784
1785                         if (p_last_CCWB==NULL) {
1786                                 p_buf->next=NULL;
1787                                 real_TIC_address=0;
1788                                 p_last_CCWB=p_buf;
1789                         }
1790                         else {
1791                                 p_buf->next=p_first_CCWB;
1792                                 real_TIC_address=
1793                                 (__u32)__pa(&p_first_CCWB -> read );
1794                         }
1795
1796                         p_first_CCWB=p_buf;
1797
1798                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1799                         /*  initialize read command */
1800                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1801                         p_buf-> read.cda = (__u32)__pa(p_buff);
1802                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1803                         p_buf-> read.count       = privptr->p_env->read_size;
1804
1805                         /*  initialize read_h command */
1806                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1807                         p_buf-> read_h.cda =
1808                                 (__u32)__pa(&(p_buf->header));
1809                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1810                         p_buf-> read_h.count      = sizeof(struct clawh);
1811
1812                         /*  initialize Signal command */
1813                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1814                         p_buf-> signal.cda =
1815                                 (__u32)__pa(&(pClawH->flag));
1816                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1817                         p_buf-> signal.count     = 1;
1818
1819                         /*  initialize r_TIC_1 command */
1820                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1821                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1822                         p_buf-> r_TIC_1.flags = 0;
1823                         p_buf-> r_TIC_1.count      = 0;
1824
1825                         /*  initialize r_read_FF command */
1826                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1827                         p_buf-> r_read_FF.cda =
1828                                 (__u32)__pa(&(pClawH->flag));
1829                         p_buf-> r_read_FF.flags =
1830                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1831                         p_buf-> r_read_FF.count    = 1;
1832
1833                         /*    initialize r_TIC_2          */
1834                         memcpy(&p_buf->r_TIC_2,
1835                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1836
1837                         /*     initialize Header     */
1838                         p_buf->header.length=0xffff;
1839                         p_buf->header.opcode=0xff;
1840                         p_buf->header.flag=CLAW_PENDING;
1841
1842                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1843                                 ((unsigned long)(p_buff+2*(privptr->p_env->read_size) -1)
1844                                  & PAGE_MASK) ) {
1845                                 p_buff= p_buff+privptr->p_env->read_size;
1846                         }
1847                         else {
1848                                 p_buff=
1849                                 (void *)((unsigned long)
1850                                         (p_buff+2*(privptr->p_env->read_size) -1)
1851                                          & PAGE_MASK) ;
1852                         }
1853                 }   /* for read_buffers   */
1854           }         /* read_size < PAGE_SIZE  */
1855           else {  /* read Size >= PAGE_SIZE  */
1856                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1857                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1858                                 (int)pages_to_order_of_mag(privptr->p_buff_pages_perread) );
1859                         if (p_buff==NULL) {
1860                                 free_pages((unsigned long)privptr->p_buff_ccw,
1861                                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
1862                                 /* free the write pages  */
1863                                 p_buf=privptr->p_buff_write;
1864                                 while (p_buf!=NULL) {
1865                                         free_pages((unsigned long)p_buf->p_buffer,
1866                                                 (int)pages_to_order_of_mag(
1867                                                 privptr->p_buff_pages_perwrite ));
1868                                         p_buf=p_buf->next;
1869                                 }
1870                                 /* free any read pages already alloc  */
1871                                 p_buf=privptr->p_buff_read;
1872                                 while (p_buf!=NULL) {
1873                                         free_pages((unsigned long)p_buf->p_buffer,
1874                                                 (int)pages_to_order_of_mag(
1875                                                 privptr->p_buff_pages_perread ));
1876                                         p_buf=p_buf->next;
1877                                 }
1878                                 privptr->p_buff_ccw=NULL;
1879                                 privptr->p_buff_write=NULL;
1880                                 return -ENOMEM;
1881                         }
1882                         memset(p_buff, 0x00, privptr->p_env->read_size);
1883                         p_buf        = p_free_chain;
1884                         privptr->p_buff_read = p_buf;
1885                         p_free_chain = p_buf->next;
1886
1887                         if (p_last_CCWB==NULL) {
1888                                 p_buf->next=NULL;
1889                                 real_TIC_address=0;
1890                                 p_last_CCWB=p_buf;
1891                         }
1892                         else {
1893                                 p_buf->next=p_first_CCWB;
1894                                 real_TIC_address=
1895                                         (addr_t)__pa(
1896                                                 &p_first_CCWB -> read );
1897                         }
1898
1899                         p_first_CCWB=p_buf;
1900                                 /* save buff address */
1901                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1902                         /*  initialize read command */
1903                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1904                         p_buf-> read.cda = (__u32)__pa(p_buff);
1905                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1906                         p_buf-> read.count       = privptr->p_env->read_size;
1907
1908                         /*  initialize read_h command */
1909                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1910                         p_buf-> read_h.cda =
1911                                 (__u32)__pa(&(p_buf->header));
1912                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1913                         p_buf-> read_h.count      = sizeof(struct clawh);
1914
1915                         /*  initialize Signal command */
1916                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1917                         p_buf-> signal.cda =
1918                                 (__u32)__pa(&(pClawH->flag));
1919                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1920                         p_buf-> signal.count     = 1;
1921
1922                         /*  initialize r_TIC_1 command */
1923                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1924                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1925                         p_buf-> r_TIC_1.flags = 0;
1926                         p_buf-> r_TIC_1.count      = 0;
1927
1928                         /*  initialize r_read_FF command */
1929                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1930                         p_buf-> r_read_FF.cda =
1931                                 (__u32)__pa(&(pClawH->flag));
1932                         p_buf-> r_read_FF.flags =
1933                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1934                         p_buf-> r_read_FF.count    = 1;
1935
1936                         /*    initialize r_TIC_2          */
1937                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1938                                 sizeof(struct ccw1));
1939
1940                         /*     initialize Header     */
1941                         p_buf->header.length=0xffff;
1942                         p_buf->header.opcode=0xff;
1943                         p_buf->header.flag=CLAW_PENDING;
1944
1945                 }    /* For read_buffers   */
1946           }     /*  read_size >= PAGE_SIZE   */
1947         }       /*  pBuffread = NULL */
1948         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1949         privptr->buffs_alloc = 1;
1950
1951         return 0;
1952 }    /*    end of init_ccw_bk */
1953
1954 /*-------------------------------------------------------------------*
1955 *                                                                    *
1956 *       probe_error                                                  *
1957 *                                                                    *
1958 *--------------------------------------------------------------------*/
1959
1960 static void
1961 probe_error( struct ccwgroup_device *cgdev)
1962 {
1963         struct claw_privbk *privptr;
1964
1965         CLAW_DBF_TEXT(4, trace, "proberr");
1966         privptr = (struct claw_privbk *) cgdev->dev.driver_data;
1967         if (privptr != NULL) {
1968                 cgdev->dev.driver_data = NULL;
1969                 kfree(privptr->p_env);
1970                 kfree(privptr->p_mtc_envelope);
1971                 kfree(privptr);
1972         }
1973 }    /*    probe_error    */
1974
1975 /*-------------------------------------------------------------------*
1976 *    claw_process_control                                            *
1977 *                                                                    *
1978 *                                                                    *
1979 *--------------------------------------------------------------------*/
1980
1981 static int
1982 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1983 {
1984
1985         struct clawbuf *p_buf;
1986         struct clawctl  ctlbk;
1987         struct clawctl *p_ctlbk;
1988         char    temp_host_name[8];
1989         char    temp_ws_name[8];
1990         struct claw_privbk *privptr;
1991         struct claw_env *p_env;
1992         struct sysval *p_sysval;
1993         struct conncmd *p_connect=NULL;
1994         int rc;
1995         struct chbk *p_ch = NULL;
1996         struct device *tdev;
1997         CLAW_DBF_TEXT(2, setup, "clw_cntl");
1998         udelay(1000);  /* Wait a ms for the control packets to
1999                         *catch up to each other */
2000         privptr = dev->ml_priv;
2001         p_env=privptr->p_env;
2002         tdev = &privptr->channel[READ].cdev->dev;
2003         memcpy( &temp_host_name, p_env->host_name, 8);
2004         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2005         printk(KERN_INFO "%s: CLAW device %.8s: "
2006                 "Received Control Packet\n",
2007                 dev->name, temp_ws_name);
2008         if (privptr->release_pend==1) {
2009                 return 0;
2010         }
2011         p_buf=p_ccw->p_buffer;
2012         p_ctlbk=&ctlbk;
2013         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2014                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2015         } else {
2016                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2017         }
2018         switch (p_ctlbk->command)
2019         {
2020         case SYSTEM_VALIDATE_REQUEST:
2021                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2022                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2023                                 CLAW_RC_WRONG_VERSION);
2024                         printk("%s: %d is wrong version id. "
2025                                "Expected %d\n",
2026                                dev->name, p_ctlbk->version,
2027                                CLAW_VERSION_ID);
2028                 }
2029                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2030                 printk("%s: Recv Sys Validate Request: "
2031                        "Vers=%d,link_id=%d,Corr=%d,WS name=%."
2032                        "8s,Host name=%.8s\n",
2033                        dev->name, p_ctlbk->version,
2034                        p_ctlbk->linkid,
2035                        p_ctlbk->correlator,
2036                        p_sysval->WS_name,
2037                        p_sysval->host_name);
2038                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2039                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2040                                 CLAW_RC_NAME_MISMATCH);
2041                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2042                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2043                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2044                         printk(KERN_INFO "%s:  Host name mismatch\n",
2045                                 dev->name);
2046                         printk(KERN_INFO "%s: Received :%s: "
2047                                 "expected :%s: \n",
2048                                 dev->name,
2049                                 p_sysval->host_name,
2050                                 temp_host_name);
2051                 }
2052                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2053                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2054                                 CLAW_RC_NAME_MISMATCH);
2055                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2056                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2057                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2058                         printk(KERN_INFO "%s: WS name mismatch\n",
2059                                 dev->name);
2060                         printk(KERN_INFO "%s: Received :%s: "
2061                                "expected :%s: \n",
2062                                dev->name,
2063                                p_sysval->WS_name,
2064                                temp_ws_name);
2065                 }
2066                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2067                     (p_env->packing == 0)) {
2068                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2069                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2070                         printk(KERN_INFO "%s: host write size is too "
2071                                 "small\n", dev->name);
2072                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2073                 }
2074                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2075                     (p_env->packing == 0)) {
2076                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2077                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2078                         printk(KERN_INFO "%s: host read size is too "
2079                                 "small\n", dev->name);
2080                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2081                 }
2082                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2083                 printk(KERN_INFO "%s: CLAW device %.8s: System validate "
2084                         "completed.\n", dev->name, temp_ws_name);
2085                 printk("%s: sys Validate Rsize:%d Wsize:%d\n", dev->name,
2086                         p_sysval->read_frame_size, p_sysval->write_frame_size);
2087                 privptr->system_validate_comp = 1;
2088                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2089                         p_env->packing = PACKING_ASK;
2090                 claw_strt_conn_req(dev);
2091                 break;
2092         case SYSTEM_VALIDATE_RESPONSE:
2093                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2094                 printk("%s: Recv Sys Validate Resp: Vers=%d,Corr=%d,RC=%d,"
2095                         "WS name=%.8s,Host name=%.8s\n",
2096                         dev->name,
2097                         p_ctlbk->version,
2098                         p_ctlbk->correlator,
2099                         p_ctlbk->rc,
2100                         p_sysval->WS_name,
2101                         p_sysval->host_name);
2102                 switch (p_ctlbk->rc) {
2103                 case 0:
2104                         printk(KERN_INFO "%s: CLAW device "
2105                                 "%.8s: System validate "
2106                                 "completed.\n",
2107                                dev->name, temp_ws_name);
2108                         if (privptr->system_validate_comp == 0)
2109                                 claw_strt_conn_req(dev);
2110                         privptr->system_validate_comp = 1;
2111                         break;
2112                 case CLAW_RC_NAME_MISMATCH:
2113                         printk(KERN_INFO "%s: Sys Validate "
2114                                 "Resp : Host, WS name is "
2115                                 "mismatch\n",
2116                                dev->name);
2117                         break;
2118                 case CLAW_RC_WRONG_VERSION:
2119                         printk(KERN_INFO "%s: Sys Validate "
2120                                 "Resp : Wrong version\n",
2121                                 dev->name);
2122                         break;
2123                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2124                         printk(KERN_INFO "%s: Sys Validate "
2125                                 "Resp : bad frame size\n",
2126                                 dev->name);
2127                         break;
2128                 default:
2129                         printk(KERN_INFO "%s: Sys Validate "
2130                                 "error code=%d \n",
2131                                  dev->name, p_ctlbk->rc);
2132                         break;
2133                 }
2134                 break;
2135
2136         case CONNECTION_REQUEST:
2137                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2138                 printk(KERN_INFO "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2139                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2140                         dev->name,
2141                         p_ctlbk->version,
2142                         p_ctlbk->linkid,
2143                         p_ctlbk->correlator,
2144                         p_connect->host_name,
2145                         p_connect->WS_name);
2146                 if (privptr->active_link_ID != 0) {
2147                         claw_snd_disc(dev, p_ctlbk);
2148                         printk(KERN_INFO "%s: Conn Req error : "
2149                                 "already logical link is active \n",
2150                                 dev->name);
2151                 }
2152                 if (p_ctlbk->linkid != 1) {
2153                         claw_snd_disc(dev, p_ctlbk);
2154                         printk(KERN_INFO "%s: Conn Req error : "
2155                                 "req logical link id is not 1\n",
2156                                 dev->name);
2157                 }
2158                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2159                 if (rc != 0) {
2160                         claw_snd_disc(dev, p_ctlbk);
2161                         printk(KERN_INFO "%s: Conn Resp error: "
2162                                 "req appl name does not match\n",
2163                                 dev->name);
2164                 }
2165                 claw_send_control(dev,
2166                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2167                         p_ctlbk->correlator,
2168                         0, p_connect->host_name,
2169                         p_connect->WS_name);
2170                 if (p_env->packing == PACKING_ASK) {
2171                         p_env->packing = PACK_SEND;
2172                         claw_snd_conn_req(dev, 0);
2173                 }
2174                 printk(KERN_INFO "%s: CLAW device %.8s: Connection "
2175                         "completed link_id=%d.\n",
2176                         dev->name, temp_ws_name,
2177                         p_ctlbk->linkid);
2178                         privptr->active_link_ID = p_ctlbk->linkid;
2179                         p_ch = &privptr->channel[WRITE];
2180                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2181                 break;
2182         case CONNECTION_RESPONSE:
2183                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2184                 printk(KERN_INFO "%s: Revc Conn Resp: Vers=%d,link_id=%d,"
2185                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2186                         dev->name,
2187                         p_ctlbk->version,
2188                         p_ctlbk->linkid,
2189                         p_ctlbk->correlator,
2190                         p_ctlbk->rc,
2191                         p_connect->host_name,
2192                         p_connect->WS_name);
2193
2194                 if (p_ctlbk->rc != 0) {
2195                         printk(KERN_INFO "%s: Conn Resp error: rc=%d \n",
2196                                 dev->name, p_ctlbk->rc);
2197                         return 1;
2198                 }
2199                 rc = find_link(dev,
2200                         p_connect->host_name, p_connect->WS_name);
2201                 if (rc != 0) {
2202                         claw_snd_disc(dev, p_ctlbk);
2203                         printk(KERN_INFO "%s: Conn Resp error: "
2204                                 "req appl name does not match\n",
2205                                  dev->name);
2206                 }
2207                 /* should be until CONNECTION_CONFIRM */
2208                 privptr->active_link_ID = -(p_ctlbk->linkid);
2209                 break;
2210         case CONNECTION_CONFIRM:
2211                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2212                 printk(KERN_INFO "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2213                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2214                         dev->name,
2215                         p_ctlbk->version,
2216                         p_ctlbk->linkid,
2217                         p_ctlbk->correlator,
2218                         p_connect->host_name,
2219                         p_connect->WS_name);
2220                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2221                         privptr->active_link_ID = p_ctlbk->linkid;
2222                         if (p_env->packing > PACKING_ASK) {
2223                                 printk(KERN_INFO "%s: Confirmed Now packing\n",
2224                                         dev->name);
2225                                 p_env->packing = DO_PACKED;
2226                         }
2227                         p_ch = &privptr->channel[WRITE];
2228                         wake_up(&p_ch->wait);
2229                 } else {
2230                        printk(KERN_INFO "%s: Conn confirm: "
2231                                 "unexpected linkid=%d \n",
2232                                 dev->name, p_ctlbk->linkid);
2233                         claw_snd_disc(dev, p_ctlbk);
2234                 }
2235                 break;
2236         case DISCONNECT:
2237                 printk(KERN_INFO "%s: Disconnect: "
2238                         "Vers=%d,link_id=%d,Corr=%d\n",
2239                         dev->name, p_ctlbk->version,
2240                         p_ctlbk->linkid, p_ctlbk->correlator);
2241                 if ((p_ctlbk->linkid == 2) &&
2242                     (p_env->packing == PACK_SEND)) {
2243                         privptr->active_link_ID = 1;
2244                         p_env->packing = DO_PACKED;
2245                 } else
2246                         privptr->active_link_ID = 0;
2247                 break;
2248         case CLAW_ERROR:
2249                 printk(KERN_INFO "%s: CLAW ERROR detected\n",
2250                         dev->name);
2251                 break;
2252         default:
2253                 printk(KERN_INFO "%s:  Unexpected command code=%d \n",
2254                         dev->name,  p_ctlbk->command);
2255                 break;
2256         }
2257
2258         return 0;
2259 }   /*    end of claw_process_control    */
2260
2261
2262 /*-------------------------------------------------------------------*
2263 *               claw_send_control                                    *
2264 *                                                                    *
2265 *--------------------------------------------------------------------*/
2266
2267 static int
2268 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2269          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2270 {
2271         struct claw_privbk              *privptr;
2272         struct clawctl                  *p_ctl;
2273         struct sysval                   *p_sysval;
2274         struct conncmd                  *p_connect;
2275         struct sk_buff                  *skb;
2276
2277         CLAW_DBF_TEXT(2, setup, "sndcntl");
2278         privptr = dev->ml_priv;
2279         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2280
2281         p_ctl->command=type;
2282         p_ctl->version=CLAW_VERSION_ID;
2283         p_ctl->linkid=link;
2284         p_ctl->correlator=correlator;
2285         p_ctl->rc=rc;
2286
2287         p_sysval=(struct sysval *)&p_ctl->data;
2288         p_connect=(struct conncmd *)&p_ctl->data;
2289
2290         switch (p_ctl->command) {
2291                 case SYSTEM_VALIDATE_REQUEST:
2292                 case SYSTEM_VALIDATE_RESPONSE:
2293                         memcpy(&p_sysval->host_name, local_name, 8);
2294                         memcpy(&p_sysval->WS_name, remote_name, 8);
2295                         if (privptr->p_env->packing > 0) {
2296                                 p_sysval->read_frame_size=DEF_PACK_BUFSIZE;
2297                                 p_sysval->write_frame_size=DEF_PACK_BUFSIZE;
2298                         } else {
2299                                 /* how big is the biggest group of packets */
2300                                 p_sysval->read_frame_size=privptr->p_env->read_size;
2301                                 p_sysval->write_frame_size=privptr->p_env->write_size;
2302                         }
2303                         memset(&p_sysval->reserved, 0x00, 4);
2304                         break;
2305                 case CONNECTION_REQUEST:
2306                 case CONNECTION_RESPONSE:
2307                 case CONNECTION_CONFIRM:
2308                 case DISCONNECT:
2309                         memcpy(&p_sysval->host_name, local_name, 8);
2310                         memcpy(&p_sysval->WS_name, remote_name, 8);
2311                         if (privptr->p_env->packing > 0) {
2312                         /* How big is the biggest packet */
2313                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2314                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2315                         } else {
2316                                 memset(&p_connect->reserved1, 0x00, 4);
2317                                 memset(&p_connect->reserved2, 0x00, 4);
2318                         }
2319                         break;
2320                 default:
2321                         break;
2322         }
2323
2324         /*      write Control Record to the device                   */
2325
2326
2327         skb = dev_alloc_skb(sizeof(struct clawctl));
2328         if (!skb) {
2329                 return -ENOMEM;
2330         }
2331         memcpy(skb_put(skb, sizeof(struct clawctl)),
2332                 p_ctl, sizeof(struct clawctl));
2333         if (privptr->p_env->packing >= PACK_SEND)
2334                 claw_hw_tx(skb, dev, 1);
2335         else
2336                 claw_hw_tx(skb, dev, 0);
2337         return 0;
2338 }  /*   end of claw_send_control  */
2339
2340 /*-------------------------------------------------------------------*
2341 *               claw_snd_conn_req                                    *
2342 *                                                                    *
2343 *--------------------------------------------------------------------*/
2344 static int
2345 claw_snd_conn_req(struct net_device *dev, __u8 link)
2346 {
2347         int                rc;
2348         struct claw_privbk *privptr = dev->ml_priv;
2349         struct clawctl     *p_ctl;
2350
2351         CLAW_DBF_TEXT(2, setup, "snd_conn");
2352         rc = 1;
2353         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2354         p_ctl->linkid = link;
2355         if ( privptr->system_validate_comp==0x00 ) {
2356                 return rc;
2357         }
2358         if (privptr->p_env->packing == PACKING_ASK )
2359                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2360                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2361         if (privptr->p_env->packing == PACK_SEND)  {
2362                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2363                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2364         }
2365         if (privptr->p_env->packing == 0)
2366                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2367                         HOST_APPL_NAME, privptr->p_env->api_type);
2368         return rc;
2369
2370 }  /*  end of claw_snd_conn_req */
2371
2372
2373 /*-------------------------------------------------------------------*
2374 *               claw_snd_disc                                        *
2375 *                                                                    *
2376 *--------------------------------------------------------------------*/
2377
2378 static int
2379 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2380 {
2381         int rc;
2382         struct conncmd *  p_connect;
2383
2384         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2385         p_connect=(struct conncmd *)&p_ctl->data;
2386
2387         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2388                 p_ctl->correlator, 0,
2389                 p_connect->host_name, p_connect->WS_name);
2390         return rc;
2391 }     /*   end of claw_snd_disc    */
2392
2393
2394 /*-------------------------------------------------------------------*
2395 *               claw_snd_sys_validate_rsp                            *
2396 *                                                                    *
2397 *--------------------------------------------------------------------*/
2398
2399 static int
2400 claw_snd_sys_validate_rsp(struct net_device *dev,
2401         struct clawctl *p_ctl, __u32 return_code)
2402 {
2403         struct claw_env *  p_env;
2404         struct claw_privbk *privptr;
2405         int    rc;
2406
2407         CLAW_DBF_TEXT(2, setup, "chkresp");
2408         privptr = dev->ml_priv;
2409         p_env=privptr->p_env;
2410         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2411                 p_ctl->linkid,
2412                 p_ctl->correlator,
2413                 return_code,
2414                 p_env->host_name,
2415                 p_env->adapter_name  );
2416         return rc;
2417 }     /*    end of claw_snd_sys_validate_rsp    */
2418
2419 /*-------------------------------------------------------------------*
2420 *               claw_strt_conn_req                                   *
2421 *                                                                    *
2422 *--------------------------------------------------------------------*/
2423
2424 static int
2425 claw_strt_conn_req(struct net_device *dev )
2426 {
2427         int rc;
2428
2429         CLAW_DBF_TEXT(2, setup, "conn_req");
2430         rc=claw_snd_conn_req(dev, 1);
2431         return rc;
2432 }    /*   end of claw_strt_conn_req   */
2433
2434
2435
2436 /*-------------------------------------------------------------------*
2437  *   claw_stats                                                      *
2438  *-------------------------------------------------------------------*/
2439
2440 static struct
2441 net_device_stats *claw_stats(struct net_device *dev)
2442 {
2443         struct claw_privbk *privptr;
2444
2445         CLAW_DBF_TEXT(4, trace, "stats");
2446         privptr = dev->ml_priv;
2447         return &privptr->stats;
2448 }     /*   end of claw_stats   */
2449
2450
2451 /*-------------------------------------------------------------------*
2452 *       unpack_read                                                  *
2453 *                                                                    *
2454 *--------------------------------------------------------------------*/
2455 static void
2456 unpack_read(struct net_device *dev )
2457 {
2458         struct sk_buff *skb;
2459         struct claw_privbk *privptr;
2460         struct claw_env    *p_env;
2461         struct ccwbk    *p_this_ccw;
2462         struct ccwbk    *p_first_ccw;
2463         struct ccwbk    *p_last_ccw;
2464         struct clawph   *p_packh;
2465         void            *p_packd;
2466         struct clawctl  *p_ctlrec=NULL;
2467         struct device   *p_dev;
2468
2469         __u32   len_of_data;
2470         __u32   pack_off;
2471         __u8    link_num;
2472         __u8    mtc_this_frm=0;
2473         __u32   bytes_to_mov;
2474         int     i=0;
2475         int     p=0;
2476
2477         CLAW_DBF_TEXT(4, trace, "unpkread");
2478         p_first_ccw=NULL;
2479         p_last_ccw=NULL;
2480         p_packh=NULL;
2481         p_packd=NULL;
2482         privptr = dev->ml_priv;
2483
2484         p_dev = &privptr->channel[READ].cdev->dev;
2485         p_env = privptr->p_env;
2486         p_this_ccw=privptr->p_read_active_first;
2487         i=0;
2488         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2489                 pack_off = 0;
2490                 p = 0;
2491                 p_this_ccw->header.flag=CLAW_PENDING;
2492                 privptr->p_read_active_first=p_this_ccw->next;
2493                 p_this_ccw->next=NULL;
2494                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2495                 if ((p_env->packing == PACK_SEND) &&
2496                     (p_packh->len == 32)           &&
2497                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2498                         p_packh++;  /* peek past pack header */
2499                         p_ctlrec = (struct clawctl *)p_packh;
2500                         p_packh--;  /* un peek */
2501                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2502                             (p_ctlrec->command == CONNECTION_CONFIRM))
2503                                 p_env->packing = DO_PACKED;
2504                 }
2505                 if (p_env->packing == DO_PACKED)
2506                         link_num=p_packh->link_num;
2507                 else
2508                         link_num=p_this_ccw->header.opcode / 8;
2509                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2510                         mtc_this_frm=1;
2511                         if (p_this_ccw->header.length!=
2512                                 privptr->p_env->read_size ) {
2513                                 printk(KERN_INFO " %s: Invalid frame detected "
2514                                         "length is %02x\n" ,
2515                                         dev->name, p_this_ccw->header.length);
2516                         }
2517                 }
2518
2519                 if (privptr->mtc_skipping) {
2520                         /*
2521                         *   We're in the mode of skipping past a
2522                         *   multi-frame message
2523                         *   that we can't process for some reason or other.
2524                         *   The first frame without the More-To-Come flag is
2525                         *   the last frame of the skipped message.
2526                         */
2527                         /*  in case of More-To-Come not set in this frame */
2528                         if (mtc_this_frm==0) {
2529                                 privptr->mtc_skipping=0; /* Ok, the end */
2530                                 privptr->mtc_logical_link=-1;
2531                         }
2532                         goto NextFrame;
2533                 }
2534
2535                 if (link_num==0) {
2536                         claw_process_control(dev, p_this_ccw);
2537                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2538                         goto NextFrame;
2539                 }
2540 unpack_next:
2541                 if (p_env->packing == DO_PACKED) {
2542                         if (pack_off > p_env->read_size)
2543                                 goto NextFrame;
2544                         p_packd = p_this_ccw->p_buffer+pack_off;
2545                         p_packh = (struct clawph *) p_packd;
2546                         if ((p_packh->len == 0) || /* all done with this frame? */
2547                             (p_packh->flag != 0))
2548                                 goto NextFrame;
2549                         bytes_to_mov = p_packh->len;
2550                         pack_off += bytes_to_mov+sizeof(struct clawph);
2551                         p++;
2552                 } else {
2553                         bytes_to_mov=p_this_ccw->header.length;
2554                 }
2555                 if (privptr->mtc_logical_link<0) {
2556
2557                 /*
2558                 *  if More-To-Come is set in this frame then we don't know
2559                 *  length of entire message, and hence have to allocate
2560                 *  large buffer   */
2561
2562                 /*      We are starting a new envelope  */
2563                 privptr->mtc_offset=0;
2564                         privptr->mtc_logical_link=link_num;
2565                 }
2566
2567                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2568                         /*      error     */
2569                         privptr->stats.rx_frame_errors++;
2570                         goto NextFrame;
2571                 }
2572                 if (p_env->packing == DO_PACKED) {
2573                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2574                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2575
2576                 } else  {
2577                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2578                                 p_this_ccw->p_buffer, bytes_to_mov);
2579                 }
2580                 if (mtc_this_frm==0) {
2581                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2582                         skb=dev_alloc_skb(len_of_data);
2583                         if (skb) {
2584                                 memcpy(skb_put(skb,len_of_data),
2585                                         privptr->p_mtc_envelope,
2586                                         len_of_data);
2587                                 skb->dev=dev;
2588                                 skb_reset_mac_header(skb);
2589                                 skb->protocol=htons(ETH_P_IP);
2590                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2591                                 privptr->stats.rx_packets++;
2592                                 privptr->stats.rx_bytes+=len_of_data;
2593                                 netif_rx(skb);
2594                         }
2595                         else {
2596                                 privptr->stats.rx_dropped++;
2597                                 printk(KERN_WARNING "%s: %s() low on memory\n",
2598                                 dev->name,__func__);
2599                         }
2600                         privptr->mtc_offset=0;
2601                         privptr->mtc_logical_link=-1;
2602                 }
2603                 else {
2604                         privptr->mtc_offset+=bytes_to_mov;
2605                 }
2606                 if (p_env->packing == DO_PACKED)
2607                         goto unpack_next;
2608 NextFrame:
2609                 /*
2610                 *   Remove ThisCCWblock from active read queue, and add it
2611                 *   to queue of free blocks to be reused.
2612                 */
2613                 i++;
2614                 p_this_ccw->header.length=0xffff;
2615                 p_this_ccw->header.opcode=0xff;
2616                 /*
2617                 *       add this one to the free queue for later reuse
2618                 */
2619                 if (p_first_ccw==NULL) {
2620                         p_first_ccw = p_this_ccw;
2621                 }
2622                 else {
2623                         p_last_ccw->next = p_this_ccw;
2624                 }
2625                 p_last_ccw = p_this_ccw;
2626                 /*
2627                 *       chain to next block on active read queue
2628                 */
2629                 p_this_ccw = privptr->p_read_active_first;
2630                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2631         } /* end of while */
2632
2633         /*      check validity                  */
2634
2635         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2636         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2637         claw_strt_read(dev, LOCK_YES);
2638         return;
2639 }     /*  end of unpack_read   */
2640
2641 /*-------------------------------------------------------------------*
2642 *       claw_strt_read                                               *
2643 *                                                                    *
2644 *--------------------------------------------------------------------*/
2645 static void
2646 claw_strt_read (struct net_device *dev, int lock )
2647 {
2648         int        rc = 0;
2649         __u32      parm;
2650         unsigned long  saveflags = 0;
2651         struct claw_privbk *privptr = dev->ml_priv;
2652         struct ccwbk*p_ccwbk;
2653         struct chbk *p_ch;
2654         struct clawh *p_clawh;
2655         p_ch=&privptr->channel[READ];
2656
2657         CLAW_DBF_TEXT(4, trace, "StRdNter");
2658         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2659         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2660
2661         if ((privptr->p_write_active_first!=NULL &&
2662              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2663             (privptr->p_read_active_first!=NULL &&
2664              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2665                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2666         }
2667         if (lock==LOCK_YES) {
2668                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2669         }
2670         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2671                 CLAW_DBF_TEXT(4, trace, "HotRead");
2672                 p_ccwbk=privptr->p_read_active_first;
2673                 parm = (unsigned long) p_ch;
2674                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2675                                        0xff, 0);
2676                 if (rc != 0) {
2677                         ccw_check_return_code(p_ch->cdev, rc);
2678                 }
2679         }
2680         else {
2681                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2682         }
2683
2684         if (lock==LOCK_YES) {
2685                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2686         }
2687         CLAW_DBF_TEXT(4, trace, "StRdExit");
2688         return;
2689 }       /*    end of claw_strt_read    */
2690
2691 /*-------------------------------------------------------------------*
2692 *       claw_strt_out_IO                                             *
2693 *                                                                    *
2694 *--------------------------------------------------------------------*/
2695
2696 static void
2697 claw_strt_out_IO( struct net_device *dev )
2698 {
2699         int                     rc = 0;
2700         unsigned long           parm;
2701         struct claw_privbk      *privptr;
2702         struct chbk             *p_ch;
2703         struct ccwbk    *p_first_ccw;
2704
2705         if (!dev) {
2706                 return;
2707         }
2708         privptr = (struct claw_privbk *)dev->ml_priv;
2709         p_ch=&privptr->channel[WRITE];
2710
2711         CLAW_DBF_TEXT(4, trace, "strt_io");
2712         p_first_ccw=privptr->p_write_active_first;
2713
2714         if (p_ch->claw_state == CLAW_STOP)
2715                 return;
2716         if (p_first_ccw == NULL) {
2717                 return;
2718         }
2719         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2720                 parm = (unsigned long) p_ch;
2721                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2722                 rc = ccw_device_start (p_ch->cdev,&p_first_ccw->write, parm,
2723                                        0xff, 0);
2724                 if (rc != 0) {
2725                         ccw_check_return_code(p_ch->cdev, rc);
2726                 }
2727         }
2728         dev->trans_start = jiffies;
2729         return;
2730 }       /*    end of claw_strt_out_IO    */
2731
2732 /*-------------------------------------------------------------------*
2733 *       Free write buffers                                           *
2734 *                                                                    *
2735 *--------------------------------------------------------------------*/
2736
2737 static void
2738 claw_free_wrt_buf( struct net_device *dev )
2739 {
2740
2741         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2742         struct ccwbk*p_first_ccw;
2743         struct ccwbk*p_last_ccw;
2744         struct ccwbk*p_this_ccw;
2745         struct ccwbk*p_next_ccw;
2746
2747         CLAW_DBF_TEXT(4, trace, "freewrtb");
2748         /*  scan the write queue to free any completed write packets   */
2749         p_first_ccw=NULL;
2750         p_last_ccw=NULL;
2751         p_this_ccw=privptr->p_write_active_first;
2752         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2753         {
2754                 p_next_ccw = p_this_ccw->next;
2755                 if (((p_next_ccw!=NULL) &&
2756                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2757                     ((p_this_ccw == privptr->p_write_active_last) &&
2758                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2759                         /* The next CCW is OK or this is  */
2760                         /* the last CCW...free it   @A1A  */
2761                         privptr->p_write_active_first=p_this_ccw->next;
2762                         p_this_ccw->header.flag=CLAW_PENDING;
2763                         p_this_ccw->next=privptr->p_write_free_chain;
2764                         privptr->p_write_free_chain=p_this_ccw;
2765                         ++privptr->write_free_count;
2766                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2767                         p_this_ccw=privptr->p_write_active_first;
2768                         privptr->stats.tx_packets++;
2769                 }
2770                 else {
2771                         break;
2772                 }
2773         }
2774         if (privptr->write_free_count!=0) {
2775                 claw_clearbit_busy(TB_NOBUFFER,dev);
2776         }
2777         /*   whole chain removed?   */
2778         if (privptr->p_write_active_first==NULL) {
2779                 privptr->p_write_active_last=NULL;
2780         }
2781         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2782         return;
2783 }
2784
2785 /*-------------------------------------------------------------------*
2786 *       claw free netdevice                                          *
2787 *                                                                    *
2788 *--------------------------------------------------------------------*/
2789 static void
2790 claw_free_netdevice(struct net_device * dev, int free_dev)
2791 {
2792         struct claw_privbk *privptr;
2793
2794         CLAW_DBF_TEXT(2, setup, "free_dev");
2795         if (!dev)
2796                 return;
2797         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2798         privptr = dev->ml_priv;
2799         if (dev->flags & IFF_RUNNING)
2800                 claw_release(dev);
2801         if (privptr) {
2802                 privptr->channel[READ].ndev = NULL;  /* say it's free */
2803         }
2804         dev->ml_priv = NULL;
2805 #ifdef MODULE
2806         if (free_dev) {
2807                 free_netdev(dev);
2808         }
2809 #endif
2810         CLAW_DBF_TEXT(2, setup, "free_ok");
2811 }
2812
2813 /**
2814  * Claw init netdevice
2815  * Initialize everything of the net device except the name and the
2816  * channel structs.
2817  */
2818 static void
2819 claw_init_netdevice(struct net_device * dev)
2820 {
2821         CLAW_DBF_TEXT(2, setup, "init_dev");
2822         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2823         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2824         dev->hard_start_xmit = claw_tx;
2825         dev->open = claw_open;
2826         dev->stop = claw_release;
2827         dev->get_stats = claw_stats;
2828         dev->change_mtu = claw_change_mtu;
2829         dev->hard_header_len = 0;
2830         dev->addr_len = 0;
2831         dev->type = ARPHRD_SLIP;
2832         dev->tx_queue_len = 1300;
2833         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2834         CLAW_DBF_TEXT(2, setup, "initok");
2835         return;
2836 }
2837
2838 /**
2839  * Init a new channel in the privptr->channel[i].
2840  *
2841  * @param cdev  The ccw_device to be added.
2842  *
2843  * @return 0 on success, !0 on error.
2844  */
2845 static int
2846 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2847 {
2848         struct chbk *p_ch;
2849         struct ccw_dev_id dev_id;
2850
2851         CLAW_DBF_TEXT_(2, setup, "%s", cdev->dev.bus_id);
2852         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2853         p_ch = &privptr->channel[i];
2854         p_ch->cdev = cdev;
2855         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", cdev->dev.bus_id);
2856         ccw_device_get_id(cdev, &dev_id);
2857         p_ch->devno = dev_id.devno;
2858         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2859                 return -ENOMEM;
2860         }
2861         return 0;
2862 }
2863
2864
2865 /**
2866  *
2867  * Setup an interface.
2868  *
2869  * @param cgdev  Device to be setup.
2870  *
2871  * @returns 0 on success, !0 on failure.
2872  */
2873 static int
2874 claw_new_device(struct ccwgroup_device *cgdev)
2875 {
2876         struct claw_privbk *privptr;
2877         struct claw_env *p_env;
2878         struct net_device *dev;
2879         int ret;
2880         struct ccw_dev_id dev_id;
2881
2882         printk(KERN_INFO "claw: add for %s\n",cgdev->cdev[READ]->dev.bus_id);
2883         CLAW_DBF_TEXT(2, setup, "new_dev");
2884         privptr = cgdev->dev.driver_data;
2885         cgdev->cdev[READ]->dev.driver_data = privptr;
2886         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2887         if (!privptr)
2888                 return -ENODEV;
2889         p_env = privptr->p_env;
2890         ccw_device_get_id(cgdev->cdev[READ], &dev_id);
2891         p_env->devno[READ] = dev_id.devno;
2892         ccw_device_get_id(cgdev->cdev[WRITE], &dev_id);
2893         p_env->devno[WRITE] = dev_id.devno;
2894         ret = add_channel(cgdev->cdev[0],0,privptr);
2895         if (ret == 0)
2896                 ret = add_channel(cgdev->cdev[1],1,privptr);
2897         if (ret != 0) {
2898                 printk(KERN_WARNING
2899                         "add channel failed with ret = %d\n", ret);
2900                 goto out;
2901         }
2902         ret = ccw_device_set_online(cgdev->cdev[READ]);
2903         if (ret != 0) {
2904                 printk(KERN_WARNING
2905                         "claw: ccw_device_set_online %s READ failed "
2906                         "with ret = %d\n",cgdev->cdev[READ]->dev.bus_id,ret);
2907                 goto out;
2908         }
2909         ret = ccw_device_set_online(cgdev->cdev[WRITE]);
2910         if (ret != 0) {
2911                 printk(KERN_WARNING
2912                         "claw: ccw_device_set_online %s WRITE failed "
2913                         "with ret = %d\n",cgdev->cdev[WRITE]->dev.bus_id, ret);
2914                 goto out;
2915         }
2916         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2917         if (!dev) {
2918                 printk(KERN_WARNING "%s:alloc_netdev failed\n",__func__);
2919                 goto out;
2920         }
2921         dev->ml_priv = privptr;
2922         cgdev->dev.driver_data = privptr;
2923         cgdev->cdev[READ]->dev.driver_data = privptr;
2924         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2925         /* sysfs magic */
2926         SET_NETDEV_DEV(dev, &cgdev->dev);
2927         if (register_netdev(dev) != 0) {
2928                 claw_free_netdevice(dev, 1);
2929                 CLAW_DBF_TEXT(2, trace, "regfail");
2930                 goto out;
2931         }
2932         dev->flags &=~IFF_RUNNING;
2933         if (privptr->buffs_alloc == 0) {
2934                 ret=init_ccw_bk(dev);
2935                 if (ret !=0) {
2936                         unregister_netdev(dev);
2937                         claw_free_netdevice(dev,1);
2938                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2939                         goto out;
2940                 }
2941         }
2942         privptr->channel[READ].ndev = dev;
2943         privptr->channel[WRITE].ndev = dev;
2944         privptr->p_env->ndev = dev;
2945
2946         printk(KERN_INFO "%s:readsize=%d  writesize=%d "
2947                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2948                 dev->name, p_env->read_size,
2949                 p_env->write_size, p_env->read_buffers,
2950                 p_env->write_buffers, p_env->devno[READ],
2951                 p_env->devno[WRITE]);
2952         printk(KERN_INFO "%s:host_name:%.8s, adapter_name "
2953                 ":%.8s api_type: %.8s\n",
2954                 dev->name, p_env->host_name,
2955                 p_env->adapter_name , p_env->api_type);
2956         return 0;
2957 out:
2958         ccw_device_set_offline(cgdev->cdev[1]);
2959         ccw_device_set_offline(cgdev->cdev[0]);
2960         return -ENODEV;
2961 }
2962
2963 static void
2964 claw_purge_skb_queue(struct sk_buff_head *q)
2965 {
2966         struct sk_buff *skb;
2967
2968         CLAW_DBF_TEXT(4, trace, "purgque");
2969         while ((skb = skb_dequeue(q))) {
2970                 atomic_dec(&skb->users);
2971                 dev_kfree_skb_any(skb);
2972         }
2973 }
2974
2975 /**
2976  * Shutdown an interface.
2977  *
2978  * @param cgdev  Device to be shut down.
2979  *
2980  * @returns 0 on success, !0 on failure.
2981  */
2982 static int
2983 claw_shutdown_device(struct ccwgroup_device *cgdev)
2984 {
2985         struct claw_privbk *priv;
2986         struct net_device *ndev;
2987         int     ret;
2988
2989         CLAW_DBF_TEXT_(2, setup, "%s", cgdev->dev.bus_id);
2990         priv = cgdev->dev.driver_data;
2991         if (!priv)
2992                 return -ENODEV;
2993         ndev = priv->channel[READ].ndev;
2994         if (ndev) {
2995                 /* Close the device */
2996                 printk(KERN_INFO
2997                         "%s: shuting down \n",ndev->name);
2998                 if (ndev->flags & IFF_RUNNING)
2999                         ret = claw_release(ndev);
3000                 ndev->flags &=~IFF_RUNNING;
3001                 unregister_netdev(ndev);
3002                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3003                 claw_free_netdevice(ndev, 1);
3004                 priv->channel[READ].ndev = NULL;
3005                 priv->channel[WRITE].ndev = NULL;
3006                 priv->p_env->ndev = NULL;
3007         }
3008         ccw_device_set_offline(cgdev->cdev[1]);
3009         ccw_device_set_offline(cgdev->cdev[0]);
3010         return 0;
3011 }
3012
3013 static void
3014 claw_remove_device(struct ccwgroup_device *cgdev)
3015 {
3016         struct claw_privbk *priv;
3017
3018         BUG_ON(!cgdev);
3019         CLAW_DBF_TEXT_(2, setup, "%s", cgdev->dev.bus_id);
3020         priv = cgdev->dev.driver_data;
3021         BUG_ON(!priv);
3022         printk(KERN_INFO "claw: %s() called %s will be removed.\n",
3023                         __func__,cgdev->cdev[0]->dev.bus_id);
3024         if (cgdev->state == CCWGROUP_ONLINE)
3025                 claw_shutdown_device(cgdev);
3026         claw_remove_files(&cgdev->dev);
3027         kfree(priv->p_mtc_envelope);
3028         priv->p_mtc_envelope=NULL;
3029         kfree(priv->p_env);
3030         priv->p_env=NULL;
3031         kfree(priv->channel[0].irb);
3032         priv->channel[0].irb=NULL;
3033         kfree(priv->channel[1].irb);
3034         priv->channel[1].irb=NULL;
3035         kfree(priv);
3036         cgdev->dev.driver_data=NULL;
3037         cgdev->cdev[READ]->dev.driver_data = NULL;
3038         cgdev->cdev[WRITE]->dev.driver_data = NULL;
3039         put_device(&cgdev->dev);
3040
3041         return;
3042 }
3043
3044
3045 /*
3046  * sysfs attributes
3047  */
3048 static ssize_t
3049 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3050 {
3051         struct claw_privbk *priv;
3052         struct claw_env *  p_env;
3053
3054         priv = dev->driver_data;
3055         if (!priv)
3056                 return -ENODEV;
3057         p_env = priv->p_env;
3058         return sprintf(buf, "%s\n",p_env->host_name);
3059 }
3060
3061 static ssize_t
3062 claw_hname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3063 {
3064         struct claw_privbk *priv;
3065         struct claw_env *  p_env;
3066
3067         priv = dev->driver_data;
3068         if (!priv)
3069                 return -ENODEV;
3070         p_env = priv->p_env;
3071         if (count > MAX_NAME_LEN+1)
3072                 return -EINVAL;
3073         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3074         strncpy(p_env->host_name,buf, count);
3075         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3076         p_env->host_name[MAX_NAME_LEN] = 0x00;
3077         CLAW_DBF_TEXT(2, setup, "HstnSet");
3078         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3079
3080         return count;
3081 }
3082
3083 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3084
3085 static ssize_t
3086 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3087 {
3088         struct claw_privbk *priv;
3089         struct claw_env *  p_env;
3090
3091         priv = dev->driver_data;
3092         if (!priv)
3093                 return -ENODEV;
3094         p_env = priv->p_env;
3095         return sprintf(buf, "%s\n", p_env->adapter_name);
3096 }
3097
3098 static ssize_t
3099 claw_adname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3100 {
3101         struct claw_privbk *priv;
3102         struct claw_env *  p_env;
3103
3104         priv = dev->driver_data;
3105         if (!priv)
3106                 return -ENODEV;
3107         p_env = priv->p_env;
3108         if (count > MAX_NAME_LEN+1)
3109                 return -EINVAL;
3110         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3111         strncpy(p_env->adapter_name,buf, count);
3112         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3113         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3114         CLAW_DBF_TEXT(2, setup, "AdnSet");
3115         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3116
3117         return count;
3118 }
3119
3120 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3121
3122 static ssize_t
3123 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3124 {
3125         struct claw_privbk *priv;
3126         struct claw_env *  p_env;
3127
3128         priv = dev->driver_data;
3129         if (!priv)
3130                 return -ENODEV;
3131         p_env = priv->p_env;
3132         return sprintf(buf, "%s\n",
3133                        p_env->api_type);
3134 }
3135
3136 static ssize_t
3137 claw_apname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3138 {
3139         struct claw_privbk *priv;
3140         struct claw_env *  p_env;
3141
3142         priv = dev->driver_data;
3143         if (!priv)
3144                 return -ENODEV;
3145         p_env = priv->p_env;
3146         if (count > MAX_NAME_LEN+1)
3147                 return -EINVAL;
3148         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3149         strncpy(p_env->api_type,buf, count);
3150         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3151         p_env->api_type[MAX_NAME_LEN] = 0x00;
3152         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3153                 p_env->read_size=DEF_PACK_BUFSIZE;
3154                 p_env->write_size=DEF_PACK_BUFSIZE;
3155                 p_env->packing=PACKING_ASK;
3156                 CLAW_DBF_TEXT(2, setup, "PACKING");
3157         }
3158         else {
3159                 p_env->packing=0;
3160                 p_env->read_size=CLAW_FRAME_SIZE;
3161                 p_env->write_size=CLAW_FRAME_SIZE;
3162                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3163         }
3164         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3165         return count;
3166 }
3167
3168 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3169
3170 static ssize_t
3171 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3172 {
3173         struct claw_privbk *priv;
3174         struct claw_env * p_env;
3175
3176         priv = dev->driver_data;
3177         if (!priv)
3178                 return -ENODEV;
3179         p_env = priv->p_env;
3180         return sprintf(buf, "%d\n", p_env->write_buffers);
3181 }
3182
3183 static ssize_t
3184 claw_wbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3185 {
3186         struct claw_privbk *priv;
3187         struct claw_env *  p_env;
3188         int nnn,max;
3189
3190         priv = dev->driver_data;
3191         if (!priv)
3192                 return -ENODEV;
3193         p_env = priv->p_env;
3194         sscanf(buf, "%i", &nnn);
3195         if (p_env->packing) {
3196                 max = 64;
3197         }
3198         else {
3199                 max = 512;
3200         }
3201         if ((nnn > max ) || (nnn < 2))
3202                 return -EINVAL;
3203         p_env->write_buffers = nnn;
3204         CLAW_DBF_TEXT(2, setup, "Wbufset");
3205         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3206         return count;
3207 }
3208
3209 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3210
3211 static ssize_t
3212 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3213 {
3214         struct claw_privbk *priv;
3215         struct claw_env *  p_env;
3216
3217         priv = dev->driver_data;
3218         if (!priv)
3219                 return -ENODEV;
3220         p_env = priv->p_env;
3221         return sprintf(buf, "%d\n", p_env->read_buffers);
3222 }
3223
3224 static ssize_t
3225 claw_rbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3226 {
3227         struct claw_privbk *priv;
3228         struct claw_env *p_env;
3229         int nnn,max;
3230
3231         priv = dev->driver_data;
3232         if (!priv)
3233                 return -ENODEV;
3234         p_env = priv->p_env;
3235         sscanf(buf, "%i", &nnn);
3236         if (p_env->packing) {
3237                 max = 64;
3238         }
3239         else {
3240                 max = 512;
3241         }
3242         if ((nnn > max ) || (nnn < 2))
3243                 return -EINVAL;
3244         p_env->read_buffers = nnn;
3245         CLAW_DBF_TEXT(2, setup, "Rbufset");
3246         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3247         return count;
3248 }
3249
3250 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3251
3252 static struct attribute *claw_attr[] = {
3253         &dev_attr_read_buffer.attr,
3254         &dev_attr_write_buffer.attr,
3255         &dev_attr_adapter_name.attr,
3256         &dev_attr_api_type.attr,
3257         &dev_attr_host_name.attr,
3258         NULL,
3259 };
3260
3261 static struct attribute_group claw_attr_group = {
3262         .attrs = claw_attr,
3263 };
3264
3265 static int
3266 claw_add_files(struct device *dev)
3267 {
3268         CLAW_DBF_TEXT(2, setup, "add_file");
3269         return sysfs_create_group(&dev->kobj, &claw_attr_group);
3270 }
3271
3272 static void
3273 claw_remove_files(struct device *dev)
3274 {
3275         CLAW_DBF_TEXT(2, setup, "rem_file");
3276         sysfs_remove_group(&dev->kobj, &claw_attr_group);
3277 }
3278
3279 /*--------------------------------------------------------------------*
3280 *    claw_init  and cleanup                                           *
3281 *---------------------------------------------------------------------*/
3282
3283 static void __exit
3284 claw_cleanup(void)
3285 {
3286         unregister_cu3088_discipline(&claw_group_driver);
3287         claw_unregister_debug_facility();
3288         printk(KERN_INFO "claw: Driver unloaded\n");
3289
3290 }
3291
3292 /**
3293  * Initialize module.
3294  * This is called just after the module is loaded.
3295  *
3296  * @return 0 on success, !0 on error.
3297  */
3298 static int __init
3299 claw_init(void)
3300 {
3301         int ret = 0;
3302         printk(KERN_INFO "claw: starting driver\n");
3303
3304         ret = claw_register_debug_facility();
3305         if (ret) {
3306                 printk(KERN_WARNING "claw: %s() debug_register failed %d\n",
3307                         __func__,ret);
3308                 return ret;
3309         }
3310         CLAW_DBF_TEXT(2, setup, "init_mod");
3311         ret = register_cu3088_discipline(&claw_group_driver);
3312         if (ret) {
3313                 CLAW_DBF_TEXT(2, setup, "init_bad");
3314                 claw_unregister_debug_facility();
3315                 printk(KERN_WARNING "claw; %s() cu3088 register failed %d\n",
3316                         __func__,ret);
3317         }
3318         return ret;
3319 }
3320
3321 module_init(claw_init);
3322 module_exit(claw_cleanup);
3323
3324 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3325 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3326                         "Copyright 2000,2008 IBM Corporation\n");
3327 MODULE_LICENSE("GPL");