drivers/s390/net/claw.c

   1 /*
   2  *  drivers/s390/net/claw.c
   3  *    ESCON CLAW network driver
   4  *
   5  *  Linux for zSeries version
   6  *    Copyright (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
  64 #define KMSG_COMPONENT "claw"
  65
  66 #include <asm/ccwdev.h>
  67 #include <asm/ccwgroup.h>
  68 #include <asm/debug.h>
  69 #include <asm/idals.h>
  70 #include <asm/io.h>
  71 #include <linux/bitops.h>
  72 #include <linux/ctype.h>
  73 #include <linux/delay.h>
  74 #include <linux/errno.h>
  75 #include <linux/if_arp.h>
  76 #include <linux/init.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/ip.h>
  79 #include <linux/kernel.h>
  80 #include <linux/module.h>
  81 #include <linux/netdevice.h>
  82 #include <linux/etherdevice.h>
  83 #include <linux/proc_fs.h>
  84 #include <linux/sched.h>
  85 #include <linux/signal.h>
  86 #include <linux/skbuff.h>
  87 #include <linux/slab.h>
  88 #include <linux/string.h>
  89 #include <linux/tcp.h>
  90 #include <linux/timer.h>
  91 #include <linux/types.h>
  92
  93 #include "cu3088.h"
  94 #include "claw.h"
  95
  96 /*
  97    CLAW uses the s390dbf file system  see claw_trace and claw_setup
  98 */
  99
 100 static char version[] __initdata = "CLAW driver";
 101 static char debug_buffer[255];
 102 /**
 103  * Debug Facility Stuff
 104  */
 105 static debug_info_t *claw_dbf_setup;
 106 static debug_info_t *claw_dbf_trace;
 107
 108 /**
 109  *  CLAW Debug Facility functions
 110  */
 111 static void
 112 claw_unregister_debug_facility(void)
 113 {
 114         if (claw_dbf_setup)
 115                 debug_unregister(claw_dbf_setup);
 116         if (claw_dbf_trace)
 117                 debug_unregister(claw_dbf_trace);
 118 }
 119
 120 static int
 121 claw_register_debug_facility(void)
 122 {
 123         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
 124         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
 125         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
 126                 claw_unregister_debug_facility();
 127                 return -ENOMEM;
 128         }
 129         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
 130         debug_set_level(claw_dbf_setup, 2);
 131         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
 132         debug_set_level(claw_dbf_trace, 2);
 133         return 0;
 134 }
 135
 136 static inline void
 137 claw_set_busy(struct net_device *dev)
 138 {
 139  ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
 140  eieio();
 141 }
 142
 143 static inline void
 144 claw_clear_busy(struct net_device *dev)
 145 {
 146         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
 147         netif_wake_queue(dev);
 148         eieio();
 149 }
 150
 151 static inline int
 152 claw_check_busy(struct net_device *dev)
 153 {
 154         eieio();
 155         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
 156 }
 157
 158 static inline void
 159 claw_setbit_busy(int nr,struct net_device *dev)
 160 {
 161         netif_stop_queue(dev);
 162         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 163 }
 164
 165 static inline void
 166 claw_clearbit_busy(int nr,struct net_device *dev)
 167 {
 168         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 169         netif_wake_queue(dev);
 170 }
 171
 172 static inline int
 173 claw_test_and_setbit_busy(int nr,struct net_device *dev)
 174 {
 175         netif_stop_queue(dev);
 176         return test_and_set_bit(nr,
 177                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
 178 }
 179
 180
 181 /* Functions for the DEV methods */
 182
 183 static int claw_probe(struct ccwgroup_device *cgdev);
 184 static void claw_remove_device(struct ccwgroup_device *cgdev);
 185 static void claw_purge_skb_queue(struct sk_buff_head *q);
 186 static int claw_new_device(struct ccwgroup_device *cgdev);
 187 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
 188 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
 189 static int claw_change_mtu( struct net_device *dev, int new_mtu);
 190 static int claw_open(struct net_device *dev);
 191 static void claw_irq_handler(struct ccw_device *cdev,
 192         unsigned long intparm, struct irb *irb);
 193 static void claw_irq_tasklet ( unsigned long data );
 194 static int claw_release(struct net_device *dev);
 195 static void claw_write_retry ( struct chbk * p_ch );
 196 static void claw_write_next ( struct chbk * p_ch );
 197 static void claw_timer ( struct chbk * p_ch );
 198
 199 /* Functions */
 200 static int add_claw_reads(struct net_device *dev,
 201         struct ccwbk* p_first, struct ccwbk* p_last);
 202 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
 203 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
 204 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
 205 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
 206 static int init_ccw_bk(struct net_device *dev);
 207 static void probe_error( struct ccwgroup_device *cgdev);
 208 static struct net_device_stats *claw_stats(struct net_device *dev);
 209 static int pages_to_order_of_mag(int num_of_pages);
 210 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
 211 /* sysfs Functions */
 212 static ssize_t claw_hname_show(struct device *dev,
 213         struct device_attribute *attr, char *buf);
 214 static ssize_t claw_hname_write(struct device *dev,
 215         struct device_attribute *attr,
 216         const char *buf, size_t count);
 217 static ssize_t claw_adname_show(struct device *dev,
 218         struct device_attribute *attr, char *buf);
 219 static ssize_t claw_adname_write(struct device *dev,
 220         struct device_attribute *attr,
 221         const char *buf, size_t count);
 222 static ssize_t claw_apname_show(struct device *dev,
 223         struct device_attribute *attr, char *buf);
 224 static ssize_t claw_apname_write(struct device *dev,
 225         struct device_attribute *attr,
 226         const char *buf, size_t count);
 227 static ssize_t claw_wbuff_show(struct device *dev,
 228         struct device_attribute *attr, char *buf);
 229 static ssize_t claw_wbuff_write(struct device *dev,
 230         struct device_attribute *attr,
 231         const char *buf, size_t count);
 232 static ssize_t claw_rbuff_show(struct device *dev,
 233         struct device_attribute *attr, char *buf);
 234 static ssize_t claw_rbuff_write(struct device *dev,
 235         struct device_attribute *attr,
 236         const char *buf, size_t count);
 237 static int claw_add_files(struct device *dev);
 238 static void claw_remove_files(struct device *dev);
 239
 240 /*   Functions for System Validate  */
 241 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
 242 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
 243        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
 244 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
 245 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
 246 static int claw_snd_sys_validate_rsp(struct net_device *dev,
 247         struct clawctl * p_ctl, __u32 return_code);
 248 static int claw_strt_conn_req(struct net_device *dev );
 249 static void claw_strt_read(struct net_device *dev, int lock);
 250 static void claw_strt_out_IO(struct net_device *dev);
 251 static void claw_free_wrt_buf(struct net_device *dev);
 252
 253 /* Functions for unpack reads   */
 254 static void unpack_read(struct net_device *dev);
 255
 256 /* ccwgroup table  */
 257
 258 static struct ccwgroup_driver claw_group_driver = {
 259         .owner       = THIS_MODULE,
 260         .name        = "claw",
 261         .max_slaves  = 2,
 262         .driver_id   = 0xC3D3C1E6,
 263         .probe       = claw_probe,
 264         .remove      = claw_remove_device,
 265         .set_online  = claw_new_device,
 266         .set_offline = claw_shutdown_device,
 267 };
 268
 269 /*
 270 *       Key functions
 271 */
 272
 273 /*----------------------------------------------------------------*
 274  *   claw_probe                                                   *
 275  *      this function is called for each CLAW device.             *
 276  *----------------------------------------------------------------*/
 277 static int
 278 claw_probe(struct ccwgroup_device *cgdev)
 279 {
 280         int             rc;
 281         struct claw_privbk *privptr=NULL;
 282
 283         CLAW_DBF_TEXT(2, setup, "probe");
 284         if (!get_device(&cgdev->dev))
 285                 return -ENODEV;
 286         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
 287         cgdev->dev.driver_data = privptr;
 288         if (privptr == NULL) {
 289                 probe_error(cgdev);
 290                 put_device(&cgdev->dev);
 291                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 292                 return -ENOMEM;
 293         }
 294         privptr->p_mtc_envelope= kzalloc( MAX_ENVELOPE_SIZE, GFP_KERNEL);
 295         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
 296         if ((privptr->p_mtc_envelope==NULL) || (privptr->p_env==NULL)) {
 297                 probe_error(cgdev);
 298                 put_device(&cgdev->dev);
 299                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 300                 return -ENOMEM;
 301         }
 302         memcpy(privptr->p_env->adapter_name,WS_NAME_NOT_DEF,8);
 303         memcpy(privptr->p_env->host_name,WS_NAME_NOT_DEF,8);
 304         memcpy(privptr->p_env->api_type,WS_NAME_NOT_DEF,8);
 305         privptr->p_env->packing = 0;
 306         privptr->p_env->write_buffers = 5;
 307         privptr->p_env->read_buffers = 5;
 308         privptr->p_env->read_size = CLAW_FRAME_SIZE;
 309         privptr->p_env->write_size = CLAW_FRAME_SIZE;
 310         rc = claw_add_files(&cgdev->dev);
 311         if (rc) {
 312                 probe_error(cgdev);
 313                 put_device(&cgdev->dev);
 314                 dev_err(&cgdev->dev, "Creating the /proc files for a new"
 315                 " CLAW device failed\n");
 316                 CLAW_DBF_TEXT_(2, setup, "probex%d", rc);
 317                 return rc;
 318         }
 319         privptr->p_env->p_priv = privptr;
 320         cgdev->cdev[0]->handler = claw_irq_handler;
 321         cgdev->cdev[1]->handler = claw_irq_handler;
 322         CLAW_DBF_TEXT(2, setup, "prbext 0");
 323
 324         return 0;
 325 }  /*  end of claw_probe       */
 326
 327 /*-------------------------------------------------------------------*
 328  *   claw_tx                                                         *
 329  *-------------------------------------------------------------------*/
 330
 331 static int
 332 claw_tx(struct sk_buff *skb, struct net_device *dev)
 333 {
 334         int             rc;
 335         struct claw_privbk *privptr = dev->ml_priv;
 336         unsigned long saveflags;
 337         struct chbk *p_ch;
 338
 339         CLAW_DBF_TEXT(4, trace, "claw_tx");
 340         p_ch=&privptr->channel[WRITE];
 341         if (skb == NULL) {
 342                 privptr->stats.tx_dropped++;
 343                 privptr->stats.tx_errors++;
 344                 CLAW_DBF_TEXT_(2, trace, "clawtx%d", -EIO);
 345                 return -EIO;
 346         }
 347         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
 348         rc=claw_hw_tx( skb, dev, 1 );
 349         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
 350         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
 351         return rc;
 352 }   /*  end of claw_tx */
 353
 354 /*------------------------------------------------------------------*
 355  *  pack the collect queue into an skb and return it                *
 356  *   If not packing just return the top skb from the queue          *
 357  *------------------------------------------------------------------*/
 358
 359 static struct sk_buff *
 360 claw_pack_skb(struct claw_privbk *privptr)
 361 {
 362         struct sk_buff *new_skb,*held_skb;
 363         struct chbk *p_ch = &privptr->channel[WRITE];
 364         struct claw_env  *p_env = privptr->p_env;
 365         int     pkt_cnt,pk_ind,so_far;
 366
 367         new_skb = NULL;         /* assume no dice */
 368         pkt_cnt = 0;
 369         CLAW_DBF_TEXT(4, trace, "PackSKBe");
 370         if (!skb_queue_empty(&p_ch->collect_queue)) {
 371         /* some data */
 372                 held_skb = skb_dequeue(&p_ch->collect_queue);
 373                 if (held_skb)
 374                         dev_kfree_skb_any(held_skb);
 375                 else
 376                         return NULL;
 377                 if (p_env->packing != DO_PACKED)
 378                         return held_skb;
 379                 /* get a new SKB we will pack at least one */
 380                 new_skb = dev_alloc_skb(p_env->write_size);
 381                 if (new_skb == NULL) {
 382                         atomic_inc(&held_skb->users);
 383                         skb_queue_head(&p_ch->collect_queue,held_skb);
 384                         return NULL;
 385                 }
 386                 /* we have packed packet and a place to put it  */
 387                 pk_ind = 1;
 388                 so_far = 0;
 389                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 390                 while ((pk_ind) && (held_skb != NULL)) {
 391                         if (held_skb->len+so_far <= p_env->write_size-8) {
 392                                 memcpy(skb_put(new_skb,held_skb->len),
 393                                         held_skb->data,held_skb->len);
 394                                 privptr->stats.tx_packets++;
 395                                 so_far += held_skb->len;
 396                                 pkt_cnt++;
 397                                 dev_kfree_skb_any(held_skb);
 398                                 held_skb = skb_dequeue(&p_ch->collect_queue);
 399                                 if (held_skb)
 400                                         atomic_dec(&held_skb->users);
 401                         } else {
 402                                 pk_ind = 0;
 403                                 atomic_inc(&held_skb->users);
 404                                 skb_queue_head(&p_ch->collect_queue,held_skb);
 405                         }
 406                 }
 407         }
 408         CLAW_DBF_TEXT(4, trace, "PackSKBx");
 409         return new_skb;
 410 }
 411
 412 /*-------------------------------------------------------------------*
 413  *   claw_change_mtu                                                 *
 414  *                                                                   *
 415  *-------------------------------------------------------------------*/
 416
 417 static int
 418 claw_change_mtu(struct net_device *dev, int new_mtu)
 419 {
 420         struct claw_privbk *privptr = dev->ml_priv;
 421         int buff_size;
 422         CLAW_DBF_TEXT(4, trace, "setmtu");
 423         buff_size = privptr->p_env->write_size;
 424         if ((new_mtu < 60) || (new_mtu > buff_size)) {
 425                 return -EINVAL;
 426         }
 427         dev->mtu = new_mtu;
 428         return 0;
 429 }  /*   end of claw_change_mtu */
 430
 431
 432 /*-------------------------------------------------------------------*
 433  *   claw_open                                                       *
 434  *                                                                   *
 435  *-------------------------------------------------------------------*/
 436 static int
 437 claw_open(struct net_device *dev)
 438 {
 439
 440         int     rc;
 441         int     i;
 442         unsigned long       saveflags=0;
 443         unsigned long       parm;
 444         struct claw_privbk  *privptr;
 445         DECLARE_WAITQUEUE(wait, current);
 446         struct timer_list  timer;
 447         struct ccwbk *p_buf;
 448
 449         CLAW_DBF_TEXT(4, trace, "open");
 450         privptr = (struct claw_privbk *)dev->ml_priv;
 451         /*   allocate and initialize CCW blocks */
 452         if (privptr->buffs_alloc == 0) {
 453                 rc=init_ccw_bk(dev);
 454                 if (rc) {
 455                         CLAW_DBF_TEXT(2, trace, "openmem");
 456                         return -ENOMEM;
 457                 }
 458         }
 459         privptr->system_validate_comp=0;
 460         privptr->release_pend=0;
 461         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 462                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 463                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 464                 privptr->p_env->packing=PACKING_ASK;
 465         } else {
 466                 privptr->p_env->packing=0;
 467                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
 468                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
 469         }
 470         claw_set_busy(dev);
 471         tasklet_init(&privptr->channel[READ].tasklet, claw_irq_tasklet,
 472                 (unsigned long) &privptr->channel[READ]);
 473         for ( i = 0; i < 2;  i++) {
 474                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 475                 init_waitqueue_head(&privptr->channel[i].wait);
 476                 /* skb_queue_head_init(&p_ch->io_queue); */
 477                 if (i == WRITE)
 478                         skb_queue_head_init(
 479                                 &privptr->channel[WRITE].collect_queue);
 480                 privptr->channel[i].flag_a = 0;
 481                 privptr->channel[i].IO_active = 0;
 482                 privptr->channel[i].flag  &= ~CLAW_TIMER;
 483                 init_timer(&timer);
 484                 timer.function = (void *)claw_timer;
 485                 timer.data = (unsigned long)(&privptr->channel[i]);
 486                 timer.expires = jiffies + 15*HZ;
 487                 add_timer(&timer);
 488                 spin_lock_irqsave(get_ccwdev_lock(
 489                         privptr->channel[i].cdev), saveflags);
 490                 parm = (unsigned long) &privptr->channel[i];
 491                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 492                 rc = 0;
 493                 add_wait_queue(&privptr->channel[i].wait, &wait);
 494                 rc = ccw_device_halt(
 495                         (struct ccw_device *)privptr->channel[i].cdev,parm);
 496                 set_current_state(TASK_INTERRUPTIBLE);
 497                 spin_unlock_irqrestore(
 498                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 499                 schedule();
 500                 set_current_state(TASK_RUNNING);
 501                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 502                 if(rc != 0)
 503                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 504                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 505                         del_timer(&timer);
 506         }
 507         if ((((privptr->channel[READ].last_dstat |
 508                 privptr->channel[WRITE].last_dstat) &
 509            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 510            (((privptr->channel[READ].flag |
 511                 privptr->channel[WRITE].flag) & CLAW_TIMER) != 0x00)) {
 512                 dev_info(&privptr->channel[READ].cdev->dev,
 513                         "%s: remote side is not ready\n", dev->name);
 514                 CLAW_DBF_TEXT(2, trace, "notrdy");
 515
 516                 for ( i = 0; i < 2;  i++) {
 517                         spin_lock_irqsave(
 518                                 get_ccwdev_lock(privptr->channel[i].cdev),
 519                                 saveflags);
 520                         parm = (unsigned long) &privptr->channel[i];
 521                         privptr->channel[i].claw_state = CLAW_STOP;
 522                         rc = ccw_device_halt(
 523                                 (struct ccw_device *)&privptr->channel[i].cdev,
 524                                 parm);
 525                         spin_unlock_irqrestore(
 526                                 get_ccwdev_lock(privptr->channel[i].cdev),
 527                                 saveflags);
 528                         if (rc != 0) {
 529                                 ccw_check_return_code(
 530                                         privptr->channel[i].cdev, rc);
 531                         }
 532                 }
 533                 free_pages((unsigned long)privptr->p_buff_ccw,
 534                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 535                 if (privptr->p_env->read_size < PAGE_SIZE) {
 536                         free_pages((unsigned long)privptr->p_buff_read,
 537                                (int)pages_to_order_of_mag(
 538                                         privptr->p_buff_read_num));
 539                 }
 540                 else {
 541                         p_buf=privptr->p_read_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_perread ));
 546                                 p_buf=p_buf->next;
 547                         }
 548                 }
 549                 if (privptr->p_env->write_size < PAGE_SIZE ) {
 550                         free_pages((unsigned long)privptr->p_buff_write,
 551                              (int)pages_to_order_of_mag(
 552                                 privptr->p_buff_write_num));
 553                 }
 554                 else {
 555                         p_buf=privptr->p_write_active_first;
 556                         while (p_buf!=NULL) {
 557                                 free_pages((unsigned long)p_buf->p_buffer,
 558                                      (int)pages_to_order_of_mag(
 559                                         privptr->p_buff_pages_perwrite ));
 560                                 p_buf=p_buf->next;
 561                         }
 562                 }
 563                 privptr->buffs_alloc = 0;
 564                 privptr->channel[READ].flag= 0x00;
 565                 privptr->channel[WRITE].flag = 0x00;
 566                 privptr->p_buff_ccw=NULL;
 567                 privptr->p_buff_read=NULL;
 568                 privptr->p_buff_write=NULL;
 569                 claw_clear_busy(dev);
 570                 CLAW_DBF_TEXT(2, trace, "open EIO");
 571                 return -EIO;
 572         }
 573
 574         /*   Send SystemValidate command */
 575
 576         claw_clear_busy(dev);
 577         CLAW_DBF_TEXT(4, trace, "openok");
 578         return 0;
 579 }    /*     end of claw_open    */
 580
 581 /*-------------------------------------------------------------------*
 582 *                                                                    *
 583 *       claw_irq_handler                                             *
 584 *                                                                    *
 585 *--------------------------------------------------------------------*/
 586 static void
 587 claw_irq_handler(struct ccw_device *cdev,
 588         unsigned long intparm, struct irb *irb)
 589 {
 590         struct chbk *p_ch = NULL;
 591         struct claw_privbk *privptr = NULL;
 592         struct net_device *dev = NULL;
 593         struct claw_env  *p_env;
 594         struct chbk *p_ch_r=NULL;
 595
 596         CLAW_DBF_TEXT(4, trace, "clawirq");
 597         /* Bypass all 'unsolicited interrupts' */
 598         if (!cdev->dev.driver_data) {
 599                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 600                         " IRQ, c-%02x d-%02x\n",
 601                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 602                 CLAW_DBF_TEXT(2, trace, "badirq");
 603                 return;
 604         }
 605         privptr = (struct claw_privbk *)cdev->dev.driver_data;
 606
 607         /* Try to extract channel from driver data. */
 608         if (privptr->channel[READ].cdev == cdev)
 609                 p_ch = &privptr->channel[READ];
 610         else if (privptr->channel[WRITE].cdev == cdev)
 611                 p_ch = &privptr->channel[WRITE];
 612         else {
 613                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 614                 CLAW_DBF_TEXT(2, trace, "badchan");
 615                 return;
 616         }
 617         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 618
 619         dev = (struct net_device *) (p_ch->ndev);
 620         p_env=privptr->p_env;
 621
 622         /* Copy interruption response block. */
 623         memcpy(p_ch->irb, irb, sizeof(struct irb));
 624
 625         /* Check for good subchannel return code, otherwise info message */
 626         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 627                 dev_info(&cdev->dev,
 628                         "%s: subchannel check for device: %04x -"
 629                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 630                         dev->name, p_ch->devno,
 631                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 632                         irb->scsw.cmd.cpa);
 633                 CLAW_DBF_TEXT(2, trace, "chanchk");
 634                 /* return; */
 635         }
 636
 637         /* Check the reason-code of a unit check */
 638         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 639                 ccw_check_unit_check(p_ch, irb->ecw[0]);
 640
 641         /* State machine to bring the connection up, down and to restart */
 642         p_ch->last_dstat = irb->scsw.cmd.dstat;
 643
 644         switch (p_ch->claw_state) {
 645         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 646                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 647                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 648                 (p_ch->irb->scsw.cmd.stctl ==
 649                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 650                         return;
 651                 wake_up(&p_ch->wait);   /* wake up claw_release */
 652                 CLAW_DBF_TEXT(4, trace, "stop");
 653                 return;
 654         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 655                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 656                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 657                 (p_ch->irb->scsw.cmd.stctl ==
 658                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 659                         CLAW_DBF_TEXT(4, trace, "haltio");
 660                         return;
 661                 }
 662                 if (p_ch->flag == CLAW_READ) {
 663                         p_ch->claw_state = CLAW_START_READ;
 664                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 665                 } else if (p_ch->flag == CLAW_WRITE) {
 666                         p_ch->claw_state = CLAW_START_WRITE;
 667                         /*      send SYSTEM_VALIDATE                    */
 668                         claw_strt_read(dev, LOCK_NO);
 669                         claw_send_control(dev,
 670                                 SYSTEM_VALIDATE_REQUEST,
 671                                 0, 0, 0,
 672                                 p_env->host_name,
 673                                 p_env->adapter_name);
 674                 } else {
 675                         dev_warn(&cdev->dev, "The CLAW device received"
 676                                 " an unexpected IRQ, "
 677                                 "c-%02x d-%02x\n",
 678                                 irb->scsw.cmd.cstat,
 679                                 irb->scsw.cmd.dstat);
 680                         return;
 681                         }
 682                 CLAW_DBF_TEXT(4, trace, "haltio");
 683                 return;
 684         case CLAW_START_READ:
 685                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 686                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 687                         clear_bit(0, (void *)&p_ch->IO_active);
 688                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 689                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 690                             (p_ch->irb->ecw[0])        == 0) {
 691                                 privptr->stats.rx_errors++;
 692                                 dev_info(&cdev->dev,
 693                                         "%s: Restart is required after remote "
 694                                         "side recovers \n",
 695                                         dev->name);
 696                         }
 697                         CLAW_DBF_TEXT(4, trace, "notrdy");
 698                         return;
 699                 }
 700                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 701                         (p_ch->irb->scsw.cmd.dstat == 0)) {
 702                         if (test_and_set_bit(CLAW_BH_ACTIVE,
 703                                 (void *)&p_ch->flag_a) == 0)
 704                                 tasklet_schedule(&p_ch->tasklet);
 705                         else
 706                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
 707                         CLAW_DBF_TEXT(4, trace, "PCI_read");
 708                         return;
 709                 }
 710                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 711                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 712                  (p_ch->irb->scsw.cmd.stctl ==
 713                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 714                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
 715                         return;
 716                 }
 717                 clear_bit(0, (void *)&p_ch->IO_active);
 718                 claw_clearbit_busy(TB_RETRY, dev);
 719                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 720                         (void *)&p_ch->flag_a) == 0)
 721                         tasklet_schedule(&p_ch->tasklet);
 722                 else
 723                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
 724                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 725                 return;
 726         case CLAW_START_WRITE:
 727                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 728                         dev_info(&cdev->dev,
 729                                 "%s: Unit Check Occured in "
 730                                 "write channel\n", dev->name);
 731                         clear_bit(0, (void *)&p_ch->IO_active);
 732                         if (p_ch->irb->ecw[0] & 0x80) {
 733                                 dev_info(&cdev->dev,
 734                                         "%s: Resetting Event "
 735                                         "occurred:\n", dev->name);
 736                                 init_timer(&p_ch->timer);
 737                                 p_ch->timer.function =
 738                                         (void *)claw_write_retry;
 739                                 p_ch->timer.data = (unsigned long)p_ch;
 740                                 p_ch->timer.expires = jiffies + 10*HZ;
 741                                 add_timer(&p_ch->timer);
 742                                 dev_info(&cdev->dev,
 743                                         "%s: write connection "
 744                                         "restarting\n", dev->name);
 745                         }
 746                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 747                         return;
 748                 }
 749                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 750                         clear_bit(0, (void *)&p_ch->IO_active);
 751                         dev_info(&cdev->dev,
 752                                 "%s: Unit Exception "
 753                                 "occurred in write channel\n",
 754                                 dev->name);
 755                 }
 756                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 757                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 758                 (p_ch->irb->scsw.cmd.stctl ==
 759                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 760                         CLAW_DBF_TEXT(4, trace, "writeUE");
 761                         return;
 762                 }
 763                 clear_bit(0, (void *)&p_ch->IO_active);
 764                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 765                         claw_write_next(p_ch);
 766                         claw_clearbit_busy(TB_TX, dev);
 767                         claw_clear_busy(dev);
 768                 }
 769                 p_ch_r = (struct chbk *)&privptr->channel[READ];
 770                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 771                         (void *)&p_ch_r->flag_a) == 0)
 772                         tasklet_schedule(&p_ch_r->tasklet);
 773                 CLAW_DBF_TEXT(4, trace, "StWtExit");
 774                 return;
 775         default:
 776                 dev_warn(&cdev->dev,
 777                         "The CLAW device for %s received an unexpected IRQ\n",
 778                          dev->name);
 779                 CLAW_DBF_TEXT(2, trace, "badIRQ");
 780                 return;
 781         }
 782
 783 }       /*   end of claw_irq_handler    */
 784
 785
 786 /*-------------------------------------------------------------------*
 787 *       claw_irq_tasklet                                             *
 788 *                                                                    *
 789 *--------------------------------------------------------------------*/
 790 static void
 791 claw_irq_tasklet ( unsigned long data )
 792 {
 793         struct chbk * p_ch;
 794         struct net_device  *dev;
 795         struct claw_privbk *       privptr;
 796
 797         p_ch = (struct chbk *) data;
 798         dev = (struct net_device *)p_ch->ndev;
 799         CLAW_DBF_TEXT(4, trace, "IRQtask");
 800         privptr = (struct claw_privbk *)dev->ml_priv;
 801         unpack_read(dev);
 802         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 803         CLAW_DBF_TEXT(4, trace, "TskletXt");
 804         return;
 805 }       /*    end of claw_irq_bh    */
 806
 807 /*-------------------------------------------------------------------*
 808 *       claw_release                                                 *
 809 *                                                                    *
 810 *--------------------------------------------------------------------*/
 811 static int
 812 claw_release(struct net_device *dev)
 813 {
 814         int                rc;
 815         int                i;
 816         unsigned long      saveflags;
 817         unsigned long      parm;
 818         struct claw_privbk *privptr;
 819         DECLARE_WAITQUEUE(wait, current);
 820         struct ccwbk*             p_this_ccw;
 821         struct ccwbk*             p_buf;
 822
 823         if (!dev)
 824                 return 0;
 825         privptr = (struct claw_privbk *)dev->ml_priv;
 826         if (!privptr)
 827                 return 0;
 828         CLAW_DBF_TEXT(4, trace, "release");
 829         privptr->release_pend=1;
 830         claw_setbit_busy(TB_STOP,dev);
 831         for ( i = 1; i >=0 ;  i--) {
 832                 spin_lock_irqsave(
 833                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 834              /*   del_timer(&privptr->channel[READ].timer);  */
 835                 privptr->channel[i].claw_state = CLAW_STOP;
 836                 privptr->channel[i].IO_active = 0;
 837                 parm = (unsigned long) &privptr->channel[i];
 838                 if (i == WRITE)
 839                         claw_purge_skb_queue(
 840                                 &privptr->channel[WRITE].collect_queue);
 841                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 842                 if (privptr->system_validate_comp==0x00)  /* never opened? */
 843                    init_waitqueue_head(&privptr->channel[i].wait);
 844                 add_wait_queue(&privptr->channel[i].wait, &wait);
 845                 set_current_state(TASK_INTERRUPTIBLE);
 846                 spin_unlock_irqrestore(
 847                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 848                 schedule();
 849                 set_current_state(TASK_RUNNING);
 850                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 851                 if (rc != 0) {
 852                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 853                 }
 854         }
 855         if (privptr->pk_skb != NULL) {
 856                 dev_kfree_skb_any(privptr->pk_skb);
 857                 privptr->pk_skb = NULL;
 858         }
 859         if(privptr->buffs_alloc != 1) {
 860                 CLAW_DBF_TEXT(4, trace, "none2fre");
 861                 return 0;
 862         }
 863         CLAW_DBF_TEXT(4, trace, "freebufs");
 864         if (privptr->p_buff_ccw != NULL) {
 865                 free_pages((unsigned long)privptr->p_buff_ccw,
 866                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 867         }
 868         CLAW_DBF_TEXT(4, trace, "freeread");
 869         if (privptr->p_env->read_size < PAGE_SIZE) {
 870             if (privptr->p_buff_read != NULL) {
 871                 free_pages((unsigned long)privptr->p_buff_read,
 872                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 873                 }
 874         }
 875         else {
 876                 p_buf=privptr->p_read_active_first;
 877                 while (p_buf!=NULL) {
 878                         free_pages((unsigned long)p_buf->p_buffer,
 879                              (int)pages_to_order_of_mag(
 880                                 privptr->p_buff_pages_perread ));
 881                         p_buf=p_buf->next;
 882                 }
 883         }
 884          CLAW_DBF_TEXT(4, trace, "freewrit");
 885         if (privptr->p_env->write_size < PAGE_SIZE ) {
 886                 free_pages((unsigned long)privptr->p_buff_write,
 887                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 888         }
 889         else {
 890                 p_buf=privptr->p_write_active_first;
 891                 while (p_buf!=NULL) {
 892                         free_pages((unsigned long)p_buf->p_buffer,
 893                               (int)pages_to_order_of_mag(
 894                               privptr->p_buff_pages_perwrite ));
 895                         p_buf=p_buf->next;
 896                 }
 897         }
 898          CLAW_DBF_TEXT(4, trace, "clearptr");
 899         privptr->buffs_alloc = 0;
 900         privptr->p_buff_ccw=NULL;
 901         privptr->p_buff_read=NULL;
 902         privptr->p_buff_write=NULL;
 903         privptr->system_validate_comp=0;
 904         privptr->release_pend=0;
 905         /*      Remove any writes that were pending and reset all reads   */
 906         p_this_ccw=privptr->p_read_active_first;
 907         while (p_this_ccw!=NULL) {
 908                 p_this_ccw->header.length=0xffff;
 909                 p_this_ccw->header.opcode=0xff;
 910                 p_this_ccw->header.flag=0x00;
 911                 p_this_ccw=p_this_ccw->next;
 912         }
 913
 914         while (privptr->p_write_active_first!=NULL) {
 915                 p_this_ccw=privptr->p_write_active_first;
 916                 p_this_ccw->header.flag=CLAW_PENDING;
 917                 privptr->p_write_active_first=p_this_ccw->next;
 918                 p_this_ccw->next=privptr->p_write_free_chain;
 919                 privptr->p_write_free_chain=p_this_ccw;
 920                 ++privptr->write_free_count;
 921         }
 922         privptr->p_write_active_last=NULL;
 923         privptr->mtc_logical_link = -1;
 924         privptr->mtc_skipping = 1;
 925         privptr->mtc_offset=0;
 926
 927         if (((privptr->channel[READ].last_dstat |
 928                 privptr->channel[WRITE].last_dstat) &
 929                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 930                 dev_warn(&privptr->channel[READ].cdev->dev,
 931                         "Deactivating %s completed with incorrect"
 932                         " subchannel status "
 933                         "(read %02x, write %02x)\n",
 934                 dev->name,
 935                 privptr->channel[READ].last_dstat,
 936                 privptr->channel[WRITE].last_dstat);
 937                  CLAW_DBF_TEXT(2, trace, "badclose");
 938         }
 939         CLAW_DBF_TEXT(4, trace, "rlsexit");
 940         return 0;
 941 }      /* end of claw_release     */
 942
 943 /*-------------------------------------------------------------------*
 944 *       claw_write_retry                                             *
 945 *                                                                    *
 946 *--------------------------------------------------------------------*/
 947
 948 static void
 949 claw_write_retry ( struct chbk *p_ch )
 950 {
 951
 952         struct net_device  *dev=p_ch->ndev;
 953
 954         CLAW_DBF_TEXT(4, trace, "w_retry");
 955         if (p_ch->claw_state == CLAW_STOP) {
 956                 return;
 957         }
 958         claw_strt_out_IO( dev );
 959         CLAW_DBF_TEXT(4, trace, "rtry_xit");
 960         return;
 961 }      /* end of claw_write_retry      */
 962
 963
 964 /*-------------------------------------------------------------------*
 965 *       claw_write_next                                              *
 966 *                                                                    *
 967 *--------------------------------------------------------------------*/
 968
 969 static void
 970 claw_write_next ( struct chbk * p_ch )
 971 {
 972
 973         struct net_device  *dev;
 974         struct claw_privbk *privptr=NULL;
 975         struct sk_buff *pk_skb;
 976         int     rc;
 977
 978         CLAW_DBF_TEXT(4, trace, "claw_wrt");
 979         if (p_ch->claw_state == CLAW_STOP)
 980                 return;
 981         dev = (struct net_device *) p_ch->ndev;
 982         privptr = (struct claw_privbk *) dev->ml_priv;
 983         claw_free_wrt_buf( dev );
 984         if ((privptr->write_free_count > 0) &&
 985             !skb_queue_empty(&p_ch->collect_queue)) {
 986                 pk_skb = claw_pack_skb(privptr);
 987                 while (pk_skb != NULL) {
 988                         rc = claw_hw_tx( pk_skb, dev,1);
 989                         if (privptr->write_free_count > 0) {
 990                                 pk_skb = claw_pack_skb(privptr);
 991                         } else
 992                                 pk_skb = NULL;
 993                 }
 994         }
 995         if (privptr->p_write_active_first!=NULL) {
 996                 claw_strt_out_IO(dev);
 997         }
 998         return;
 999 }      /* end of claw_write_next      */
1000
1001 /*-------------------------------------------------------------------*
1002 *                                                                    *
1003 *       claw_timer                                                   *
1004 *--------------------------------------------------------------------*/
1005
1006 static void
1007 claw_timer ( struct chbk * p_ch )
1008 {
1009         CLAW_DBF_TEXT(4, trace, "timer");
1010         p_ch->flag |= CLAW_TIMER;
1011         wake_up(&p_ch->wait);
1012         return;
1013 }      /* end of claw_timer  */
1014
1015 /*
1016 *
1017 *       functions
1018 */
1019
1020
1021 /*-------------------------------------------------------------------*
1022 *                                                                    *
1023 *     pages_to_order_of_mag                                          *
1024 *                                                                    *
1025 *    takes a number of pages from 1 to 512 and returns the           *
1026 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1027 *    of magnitude get_free_pages() has an upper order of 9           *
1028 *--------------------------------------------------------------------*/
1029
1030 static int
1031 pages_to_order_of_mag(int num_of_pages)
1032 {
1033         int     order_of_mag=1;         /* assume 2 pages */
1034         int     nump=2;
1035
1036         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1037         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1038         /* 512 pages = 2Meg on 4k page systems */
1039         if (num_of_pages >= 512) {return 9; }
1040         /* we have two or more pages order is at least 1 */
1041         for (nump=2 ;nump <= 512;nump*=2) {
1042           if (num_of_pages <= nump)
1043                   break;
1044           order_of_mag +=1;
1045         }
1046         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1047         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1048         return order_of_mag;
1049 }
1050
1051 /*-------------------------------------------------------------------*
1052 *                                                                    *
1053 *     add_claw_reads                                                 *
1054 *                                                                    *
1055 *--------------------------------------------------------------------*/
1056 static int
1057 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1058         struct ccwbk* p_last)
1059 {
1060         struct claw_privbk *privptr;
1061         struct ccw1  temp_ccw;
1062         struct endccw * p_end;
1063         CLAW_DBF_TEXT(4, trace, "addreads");
1064         privptr = dev->ml_priv;
1065         p_end = privptr->p_end_ccw;
1066
1067         /* first CCW and last CCW contains a new set of read channel programs
1068         *       to apend the running channel programs
1069         */
1070         if ( p_first==NULL) {
1071                 CLAW_DBF_TEXT(4, trace, "addexit");
1072                 return 0;
1073         }
1074
1075         /* set up ending CCW sequence for this segment */
1076         if (p_end->read1) {
1077                 p_end->read1=0x00;    /*  second ending CCW is now active */
1078                 /*      reset ending CCWs and setup TIC CCWs              */
1079                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1080                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1081                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1082                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1083                 p_end->read2_nop2.cda=0;
1084                 p_end->read2_nop2.count=1;
1085         }
1086         else {
1087                 p_end->read1=0x01;  /* first ending CCW is now active */
1088                 /*      reset ending CCWs and setup TIC CCWs          */
1089                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1090                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1091                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1092                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1093                 p_end->read1_nop2.cda=0;
1094                 p_end->read1_nop2.count=1;
1095         }
1096
1097         if ( privptr-> p_read_active_first ==NULL ) {
1098                 privptr->p_read_active_first = p_first;  /*  set new first */
1099                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1100         }
1101         else {
1102
1103                 /* set up TIC ccw  */
1104                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1105                 temp_ccw.count=0;
1106                 temp_ccw.flags=0;
1107                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1108
1109
1110                 if (p_end->read1) {
1111
1112                /* first set of CCW's is chained to the new read              */
1113                /* chain, so the second set is chained to the active chain.   */
1114                /* Therefore modify the second set to point to the new        */
1115                /* read chain set up TIC CCWs                                 */
1116                /* make sure we update the CCW so channel doesn't fetch it    */
1117                /* when it's only half done                                   */
1118                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1119                                 sizeof(struct ccw1));
1120                         privptr->p_read_active_last->r_TIC_1.cda=
1121                                 (__u32)__pa(&p_first->read);
1122                         privptr->p_read_active_last->r_TIC_2.cda=
1123                                 (__u32)__pa(&p_first->read);
1124                 }
1125                 else {
1126                         /* make sure we update the CCW so channel doesn't   */
1127                         /* fetch it when it is only half done               */
1128                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1129                                 sizeof(struct ccw1));
1130                         privptr->p_read_active_last->r_TIC_1.cda=
1131                                 (__u32)__pa(&p_first->read);
1132                         privptr->p_read_active_last->r_TIC_2.cda=
1133                                 (__u32)__pa(&p_first->read);
1134                 }
1135                 /*      chain in new set of blocks                         */
1136                 privptr->p_read_active_last->next = p_first;
1137                 privptr->p_read_active_last=p_last;
1138         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1139         CLAW_DBF_TEXT(4, trace, "addexit");
1140         return 0;
1141 }    /*     end of add_claw_reads   */
1142
1143 /*-------------------------------------------------------------------*
1144  *   ccw_check_return_code                                           *
1145  *                                                                   *
1146  *-------------------------------------------------------------------*/
1147
1148 static void
1149 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1150 {
1151         CLAW_DBF_TEXT(4, trace, "ccwret");
1152         if (return_code != 0) {
1153                 switch (return_code) {
1154                 case -EBUSY: /* BUSY is a transient state no action needed */
1155                         break;
1156                 case -ENODEV:
1157                         dev_err(&cdev->dev, "The remote channel adapter is not"
1158                                 " available\n");
1159                         break;
1160                 case -EINVAL:
1161                         dev_err(&cdev->dev,
1162                                 "The status of the remote channel adapter"
1163                                 " is not valid\n");
1164                         break;
1165                 default:
1166                         dev_err(&cdev->dev, "The common device layer"
1167                                 " returned error code %d\n",
1168                                   return_code);
1169                 }
1170         }
1171         CLAW_DBF_TEXT(4, trace, "ccwret");
1172 }    /*    end of ccw_check_return_code   */
1173
1174 /*-------------------------------------------------------------------*
1175 *       ccw_check_unit_check                                         *
1176 *--------------------------------------------------------------------*/
1177
1178 static void
1179 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1180 {
1181         struct net_device *ndev = p_ch->ndev;
1182         struct device *dev = &p_ch->cdev->dev;
1183
1184         CLAW_DBF_TEXT(4, trace, "unitchek");
1185         dev_warn(dev, "The communication peer of %s disconnected\n",
1186                 ndev->name);
1187
1188         if (sense & 0x40) {
1189                 if (sense & 0x01) {
1190                         dev_warn(dev, "The remote channel adapter for"
1191                                 " %s has been reset\n",
1192                                 ndev->name);
1193                 }
1194         }
1195         else if (sense & 0x20) {
1196                 if (sense & 0x04) {
1197                         dev_warn(dev, "A data streaming timeout occurred"
1198                                 " for %s\n",
1199                                 ndev->name);
1200                 }
1201                 else  {
1202                         dev_warn(dev, "A data transfer parity error occurred"
1203                                 " for %s\n",
1204                                 ndev->name);
1205                 }
1206         }
1207         else if (sense & 0x10) {
1208                 if (sense & 0x20) {
1209                         dev_warn(dev, "The remote channel adapter for %s"
1210                                 " is faulty\n",
1211                                 ndev->name);
1212                 }
1213                 else {
1214                         dev_warn(dev, "A read data parity error occurred"
1215                                 " for %s\n",
1216                                 ndev->name);
1217                 }
1218         }
1219
1220 }   /*    end of ccw_check_unit_check    */
1221
1222 /*-------------------------------------------------------------------*
1223 *               find_link                                            *
1224 *--------------------------------------------------------------------*/
1225 static int
1226 find_link(struct net_device *dev, char *host_name, char *ws_name )
1227 {
1228         struct claw_privbk *privptr;
1229         struct claw_env *p_env;
1230         int    rc=0;
1231
1232         CLAW_DBF_TEXT(2, setup, "findlink");
1233         privptr = dev->ml_priv;
1234         p_env=privptr->p_env;
1235         switch (p_env->packing)
1236         {
1237                 case  PACKING_ASK:
1238                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1239                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1240                              rc = EINVAL;
1241                         break;
1242                 case  DO_PACKED:
1243                 case  PACK_SEND:
1244                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1245                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1246                                 rc = EINVAL;
1247                         break;
1248                 default:
1249                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1250                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1251                                 rc = EINVAL;
1252                         break;
1253         }
1254
1255         return 0;
1256 }    /*    end of find_link    */
1257
1258 /*-------------------------------------------------------------------*
1259  *   claw_hw_tx                                                      *
1260  *                                                                   *
1261  *                                                                   *
1262  *-------------------------------------------------------------------*/
1263
1264 static int
1265 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1266 {
1267         int                             rc=0;
1268         struct claw_privbk              *privptr;
1269         struct ccwbk           *p_this_ccw;
1270         struct ccwbk           *p_first_ccw;
1271         struct ccwbk           *p_last_ccw;
1272         __u32                           numBuffers;
1273         signed long                     len_of_data;
1274         unsigned long                   bytesInThisBuffer;
1275         unsigned char                   *pDataAddress;
1276         struct endccw                   *pEnd;
1277         struct ccw1                     tempCCW;
1278         struct chbk                     *p_ch;
1279         struct claw_env                 *p_env;
1280         int                             lock;
1281         struct clawph                   *pk_head;
1282         struct chbk                     *ch;
1283
1284         CLAW_DBF_TEXT(4, trace, "hw_tx");
1285         privptr = (struct claw_privbk *)(dev->ml_priv);
1286         p_ch=(struct chbk *)&privptr->channel[WRITE];
1287         p_env =privptr->p_env;
1288         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1289         /*  scan the write queue to free any completed write packets   */
1290         p_first_ccw=NULL;
1291         p_last_ccw=NULL;
1292         if ((p_env->packing >= PACK_SEND) &&
1293             (skb->cb[1] != 'P')) {
1294                 skb_push(skb,sizeof(struct clawph));
1295                 pk_head=(struct clawph *)skb->data;
1296                 pk_head->len=skb->len-sizeof(struct clawph);
1297                 if (pk_head->len%4)  {
1298                         pk_head->len+= 4-(pk_head->len%4);
1299                         skb_pad(skb,4-(pk_head->len%4));
1300                         skb_put(skb,4-(pk_head->len%4));
1301                 }
1302                 if (p_env->packing == DO_PACKED)
1303                         pk_head->link_num = linkid;
1304                 else
1305                         pk_head->link_num = 0;
1306                 pk_head->flag = 0x00;
1307                 skb_pad(skb,4);
1308                 skb->cb[1] = 'P';
1309         }
1310         if (linkid == 0) {
1311                 if (claw_check_busy(dev)) {
1312                         if (privptr->write_free_count!=0) {
1313                                 claw_clear_busy(dev);
1314                         }
1315                         else {
1316                                 claw_strt_out_IO(dev );
1317                                 claw_free_wrt_buf( dev );
1318                                 if (privptr->write_free_count==0) {
1319                                         ch = &privptr->channel[WRITE];
1320                                         atomic_inc(&skb->users);
1321                                         skb_queue_tail(&ch->collect_queue, skb);
1322                                         goto Done;
1323                                 }
1324                                 else {
1325                                         claw_clear_busy(dev);
1326                                 }
1327                         }
1328                 }
1329                 /*  tx lock  */
1330                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1331                         ch = &privptr->channel[WRITE];
1332                         atomic_inc(&skb->users);
1333                         skb_queue_tail(&ch->collect_queue, skb);
1334                         claw_strt_out_IO(dev );
1335                         rc=-EBUSY;
1336                         goto Done2;
1337                 }
1338         }
1339         /*      See how many write buffers are required to hold this data */
1340         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1341
1342         /*      If that number of buffers isn't available, give up for now */
1343         if (privptr->write_free_count < numBuffers ||
1344             privptr->p_write_free_chain == NULL ) {
1345
1346                 claw_setbit_busy(TB_NOBUFFER,dev);
1347                 ch = &privptr->channel[WRITE];
1348                 atomic_inc(&skb->users);
1349                 skb_queue_tail(&ch->collect_queue, skb);
1350                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1351                 goto Done2;
1352         }
1353         pDataAddress=skb->data;
1354         len_of_data=skb->len;
1355
1356         while (len_of_data > 0) {
1357                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1358                 if (p_this_ccw == NULL) { /* lost the race */
1359                         ch = &privptr->channel[WRITE];
1360                         atomic_inc(&skb->users);
1361                         skb_queue_tail(&ch->collect_queue, skb);
1362                         goto Done2;
1363                 }
1364                 privptr->p_write_free_chain=p_this_ccw->next;
1365                 p_this_ccw->next=NULL;
1366                 --privptr->write_free_count; /* -1 */
1367                 bytesInThisBuffer=len_of_data;
1368                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1369                 len_of_data-=bytesInThisBuffer;
1370                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1371                 /*      setup write CCW         */
1372                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1373                 if (len_of_data>0) {
1374                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1375                 }
1376                 p_this_ccw->write.count=bytesInThisBuffer;
1377                 /*      now add to end of this chain    */
1378                 if (p_first_ccw==NULL)    {
1379                         p_first_ccw=p_this_ccw;
1380                 }
1381                 if (p_last_ccw!=NULL) {
1382                         p_last_ccw->next=p_this_ccw;
1383                         /*      set up TIC ccws         */
1384                         p_last_ccw->w_TIC_1.cda=
1385                                 (__u32)__pa(&p_this_ccw->write);
1386                 }
1387                 p_last_ccw=p_this_ccw;      /* save new last block */
1388         }
1389
1390         /*      FirstCCW and LastCCW now contain a new set of write channel
1391         *       programs to append to the running channel program
1392         */
1393
1394         if (p_first_ccw!=NULL) {
1395                 /*      setup ending ccw sequence for this segment           */
1396                 pEnd=privptr->p_end_ccw;
1397                 if (pEnd->write1) {
1398                         pEnd->write1=0x00;   /* second end ccw is now active */
1399                         /*      set up Tic CCWs         */
1400                         p_last_ccw->w_TIC_1.cda=
1401                                 (__u32)__pa(&pEnd->write2_nop1);
1402                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1403                         pEnd->write2_nop2.flags    =
1404                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1405                         pEnd->write2_nop2.cda=0;
1406                         pEnd->write2_nop2.count=1;
1407                 }
1408                 else {  /*  end of if (pEnd->write1)*/
1409                         pEnd->write1=0x01;   /* first end ccw is now active */
1410                         /*      set up Tic CCWs         */
1411                         p_last_ccw->w_TIC_1.cda=
1412                                 (__u32)__pa(&pEnd->write1_nop1);
1413                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1414                         pEnd->write1_nop2.flags    =
1415                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1416                         pEnd->write1_nop2.cda=0;
1417                         pEnd->write1_nop2.count=1;
1418                 }  /* end if if (pEnd->write1) */
1419
1420                 if (privptr->p_write_active_first==NULL ) {
1421                         privptr->p_write_active_first=p_first_ccw;
1422                         privptr->p_write_active_last=p_last_ccw;
1423                 }
1424                 else {
1425                         /*      set up Tic CCWs         */
1426
1427                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1428                         tempCCW.count=0;
1429                         tempCCW.flags=0;
1430                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1431
1432                         if (pEnd->write1) {
1433
1434                  /*
1435                  * first set of ending CCW's is chained to the new write
1436                  * chain, so the second set is chained to the active chain
1437                  * Therefore modify the second set to point the new write chain.
1438                  * make sure we update the CCW atomically
1439                  * so channel does not fetch it when it's only half done
1440                  */
1441                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1442                                         sizeof(struct ccw1));
1443                                 privptr->p_write_active_last->w_TIC_1.cda=
1444                                         (__u32)__pa(&p_first_ccw->write);
1445                         }
1446                         else {
1447
1448                         /*make sure we update the CCW atomically
1449                          *so channel does not fetch it when it's only half done
1450                          */
1451                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1452                                         sizeof(struct ccw1));
1453                                 privptr->p_write_active_last->w_TIC_1.cda=
1454                                         (__u32)__pa(&p_first_ccw->write);
1455
1456                         } /* end if if (pEnd->write1) */
1457
1458                         privptr->p_write_active_last->next=p_first_ccw;
1459                         privptr->p_write_active_last=p_last_ccw;
1460                 }
1461
1462         } /* endif (p_first_ccw!=NULL)  */
1463         dev_kfree_skb_any(skb);
1464         if (linkid==0) {
1465                 lock=LOCK_NO;
1466         }
1467         else  {
1468                 lock=LOCK_YES;
1469         }
1470         claw_strt_out_IO(dev );
1471         /*      if write free count is zero , set NOBUFFER       */
1472         if (privptr->write_free_count==0) {
1473                 claw_setbit_busy(TB_NOBUFFER,dev);
1474         }
1475 Done2:
1476         claw_clearbit_busy(TB_TX,dev);
1477 Done:
1478         return(rc);
1479 }    /*    end of claw_hw_tx    */
1480
1481 /*-------------------------------------------------------------------*
1482 *                                                                    *
1483 *     init_ccw_bk                                                    *
1484 *                                                                    *
1485 *--------------------------------------------------------------------*/
1486
1487 static int
1488 init_ccw_bk(struct net_device *dev)
1489 {
1490
1491         __u32   ccw_blocks_required;
1492         __u32   ccw_blocks_perpage;
1493         __u32   ccw_pages_required;
1494         __u32   claw_reads_perpage=1;
1495         __u32   claw_read_pages;
1496         __u32   claw_writes_perpage=1;
1497         __u32   claw_write_pages;
1498         void    *p_buff=NULL;
1499         struct ccwbk*p_free_chain;
1500         struct ccwbk*p_buf;
1501         struct ccwbk*p_last_CCWB;
1502         struct ccwbk*p_first_CCWB;
1503         struct endccw *p_endccw=NULL;
1504         addr_t  real_address;
1505         struct claw_privbk *privptr = dev->ml_priv;
1506         struct clawh *pClawH=NULL;
1507         addr_t   real_TIC_address;
1508         int i,j;
1509         CLAW_DBF_TEXT(4, trace, "init_ccw");
1510
1511         /*  initialize  statistics field */
1512         privptr->active_link_ID=0;
1513         /*  initialize  ccwbk pointers  */
1514         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1515         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1516         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1517         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1518         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1519         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1520         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1521         privptr->buffs_alloc = 0;
1522         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1523         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1524         /*  initialize  free write ccwbk counter  */
1525         privptr->write_free_count=0;  /* number of free bufs on write chain */
1526         p_last_CCWB = NULL;
1527         p_first_CCWB= NULL;
1528         /*
1529         *  We need 1 CCW block for each read buffer, 1 for each
1530         *  write buffer, plus 1 for ClawSignalBlock
1531         */
1532         ccw_blocks_required =
1533                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1534         /*
1535         * compute number of CCW blocks that will fit in a page
1536         */
1537         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1538         ccw_pages_required=
1539                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1540
1541         /*
1542          *  read and write sizes are set by 2 constants in claw.h
1543          *  4k and 32k.  Unpacked values other than 4k are not going to
1544          * provide good performance. With packing buffers support 32k
1545          * buffers are used.
1546          */
1547         if (privptr->p_env->read_size < PAGE_SIZE) {
1548                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1549                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1550                                                 claw_reads_perpage);
1551          }
1552          else {       /* > or equal  */
1553                 privptr->p_buff_pages_perread =
1554                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1555                 claw_read_pages = privptr->p_env->read_buffers *
1556                                         privptr->p_buff_pages_perread;
1557          }
1558         if (privptr->p_env->write_size < PAGE_SIZE) {
1559                 claw_writes_perpage =
1560                         PAGE_SIZE / privptr->p_env->write_size;
1561                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1562                                                 claw_writes_perpage);
1563
1564         }
1565         else {      /* >  or equal  */
1566                 privptr->p_buff_pages_perwrite =
1567                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1568                 claw_write_pages = privptr->p_env->write_buffers *
1569                                         privptr->p_buff_pages_perwrite;
1570         }
1571         /*
1572         *               allocate ccw_pages_required
1573         */
1574         if (privptr->p_buff_ccw==NULL) {
1575                 privptr->p_buff_ccw=
1576                         (void *)__get_free_pages(__GFP_DMA,
1577                         (int)pages_to_order_of_mag(ccw_pages_required ));
1578                 if (privptr->p_buff_ccw==NULL) {
1579                         return -ENOMEM;
1580                 }
1581                 privptr->p_buff_ccw_num=ccw_pages_required;
1582         }
1583         memset(privptr->p_buff_ccw, 0x00,
1584                 privptr->p_buff_ccw_num * PAGE_SIZE);
1585
1586         /*
1587         *               obtain ending ccw block address
1588         *
1589         */
1590         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1591         real_address  = (__u32)__pa(privptr->p_end_ccw);
1592         /*                              Initialize ending CCW block       */
1593         p_endccw=privptr->p_end_ccw;
1594         p_endccw->real=real_address;
1595         p_endccw->write1=0x00;
1596         p_endccw->read1=0x00;
1597
1598         /*      write1_nop1                                     */
1599         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1600         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1601         p_endccw->write1_nop1.count       = 1;
1602         p_endccw->write1_nop1.cda         = 0;
1603
1604         /*      write1_nop2                                     */
1605         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1606         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1607         p_endccw->write1_nop2.count      = 1;
1608         p_endccw->write1_nop2.cda        = 0;
1609
1610         /*      write2_nop1                                     */
1611         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1612         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1613         p_endccw->write2_nop1.count        = 1;
1614         p_endccw->write2_nop1.cda          = 0;
1615
1616         /*      write2_nop2                                     */
1617         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1618         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1619         p_endccw->write2_nop2.count        = 1;
1620         p_endccw->write2_nop2.cda          = 0;
1621
1622         /*      read1_nop1                                      */
1623         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1624         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1625         p_endccw->read1_nop1.count        = 1;
1626         p_endccw->read1_nop1.cda          = 0;
1627
1628         /*      read1_nop2                                      */
1629         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1630         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1631         p_endccw->read1_nop2.count        = 1;
1632         p_endccw->read1_nop2.cda          = 0;
1633
1634         /*      read2_nop1                                      */
1635         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1636         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1637         p_endccw->read2_nop1.count        = 1;
1638         p_endccw->read2_nop1.cda          = 0;
1639
1640         /*      read2_nop2                                      */
1641         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1642         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1643         p_endccw->read2_nop2.count        = 1;
1644         p_endccw->read2_nop2.cda          = 0;
1645
1646         /*
1647         *                               Build a chain of CCWs
1648         *
1649         */
1650         p_buff=privptr->p_buff_ccw;
1651
1652         p_free_chain=NULL;
1653         for (i=0 ; i < ccw_pages_required; i++ ) {
1654                 real_address  = (__u32)__pa(p_buff);
1655                 p_buf=p_buff;
1656                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1657                         p_buf->next  = p_free_chain;
1658                         p_free_chain = p_buf;
1659                         p_buf->real=(__u32)__pa(p_buf);
1660                         ++p_buf;
1661                 }
1662                 p_buff+=PAGE_SIZE;
1663         }
1664         /*
1665         *                               Initialize ClawSignalBlock
1666         *
1667         */
1668         if (privptr->p_claw_signal_blk==NULL) {
1669                 privptr->p_claw_signal_blk=p_free_chain;
1670                 p_free_chain=p_free_chain->next;
1671                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1672                 pClawH->length=0xffff;
1673                 pClawH->opcode=0xff;
1674                 pClawH->flag=CLAW_BUSY;
1675         }
1676
1677         /*
1678         *               allocate write_pages_required and add to free chain
1679         */
1680         if (privptr->p_buff_write==NULL) {
1681             if (privptr->p_env->write_size < PAGE_SIZE) {
1682                 privptr->p_buff_write=
1683                         (void *)__get_free_pages(__GFP_DMA,
1684                         (int)pages_to_order_of_mag(claw_write_pages ));
1685                 if (privptr->p_buff_write==NULL) {
1686                         privptr->p_buff_ccw=NULL;
1687                         return -ENOMEM;
1688                 }
1689                 /*
1690                 *                               Build CLAW write free chain
1691                 *
1692                 */
1693
1694                 memset(privptr->p_buff_write, 0x00,
1695                         ccw_pages_required * PAGE_SIZE);
1696                 privptr->p_write_free_chain=NULL;
1697
1698                 p_buff=privptr->p_buff_write;
1699
1700                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1701                         p_buf        = p_free_chain;      /*  get a CCW */
1702                         p_free_chain = p_buf->next;
1703                         p_buf->next  =privptr->p_write_free_chain;
1704                         privptr->p_write_free_chain = p_buf;
1705                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1706                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1707                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1708                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1709                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1710                         p_buf-> w_read_FF.count   = 1;
1711                         p_buf-> w_read_FF.cda     =
1712                                 (__u32)__pa(&p_buf-> header.flag);
1713                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1714                         p_buf-> w_TIC_1.flags      = 0;
1715                         p_buf-> w_TIC_1.count      = 0;
1716
1717                         if (((unsigned long)p_buff +
1718                                             privptr->p_env->write_size) >=
1719                            ((unsigned long)(p_buff+2*
1720                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1721                                 p_buff = p_buff+privptr->p_env->write_size;
1722                         }
1723                 }
1724            }
1725            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1726            {
1727                privptr->p_write_free_chain=NULL;
1728                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1729                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1730                         (int)pages_to_order_of_mag(
1731                         privptr->p_buff_pages_perwrite) );
1732                    if (p_buff==NULL) {
1733                         free_pages((unsigned long)privptr->p_buff_ccw,
1734                               (int)pages_to_order_of_mag(
1735                                         privptr->p_buff_ccw_num));
1736                         privptr->p_buff_ccw=NULL;
1737                         p_buf=privptr->p_buff_write;
1738                         while (p_buf!=NULL) {
1739                                 free_pages((unsigned long)
1740                                         p_buf->p_buffer,
1741                                         (int)pages_to_order_of_mag(
1742                                         privptr->p_buff_pages_perwrite));
1743                                 p_buf=p_buf->next;
1744                         }
1745                         return -ENOMEM;
1746                    }  /* Error on get_pages   */
1747                    memset(p_buff, 0x00, privptr->p_env->write_size );
1748                    p_buf         = p_free_chain;
1749                    p_free_chain  = p_buf->next;
1750                    p_buf->next   = privptr->p_write_free_chain;
1751                    privptr->p_write_free_chain = p_buf;
1752                    privptr->p_buff_write = p_buf;
1753                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1754                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1755                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1756                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1757                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1758                    p_buf-> w_read_FF.count    = 1;
1759                    p_buf-> w_read_FF.cda      =
1760                         (__u32)__pa(&p_buf-> header.flag);
1761                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1762                    p_buf-> w_TIC_1.flags   = 0;
1763                    p_buf-> w_TIC_1.count   = 0;
1764                }  /* for all write_buffers   */
1765
1766            }    /* else buffers are PAGE_SIZE or bigger */
1767
1768         }
1769         privptr->p_buff_write_num=claw_write_pages;
1770         privptr->write_free_count=privptr->p_env->write_buffers;
1771
1772
1773         /*
1774         *               allocate read_pages_required and chain to free chain
1775         */
1776         if (privptr->p_buff_read==NULL) {
1777             if (privptr->p_env->read_size < PAGE_SIZE)  {
1778                 privptr->p_buff_read=
1779                         (void *)__get_free_pages(__GFP_DMA,
1780                         (int)pages_to_order_of_mag(claw_read_pages) );
1781                 if (privptr->p_buff_read==NULL) {
1782                         free_pages((unsigned long)privptr->p_buff_ccw,
1783                                 (int)pages_to_order_of_mag(
1784                                         privptr->p_buff_ccw_num));
1785                         /* free the write pages size is < page size  */
1786                         free_pages((unsigned long)privptr->p_buff_write,
1787                                 (int)pages_to_order_of_mag(
1788                                 privptr->p_buff_write_num));
1789                         privptr->p_buff_ccw=NULL;
1790                         privptr->p_buff_write=NULL;
1791                         return -ENOMEM;
1792                 }
1793                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1794                 privptr->p_buff_read_num=claw_read_pages;
1795                 /*
1796                 *                               Build CLAW read free chain
1797                 *
1798                 */
1799                 p_buff=privptr->p_buff_read;
1800                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1801                         p_buf        = p_free_chain;
1802                         p_free_chain = p_buf->next;
1803
1804                         if (p_last_CCWB==NULL) {
1805                                 p_buf->next=NULL;
1806                                 real_TIC_address=0;
1807                                 p_last_CCWB=p_buf;
1808                         }
1809                         else {
1810                                 p_buf->next=p_first_CCWB;
1811                                 real_TIC_address=
1812                                 (__u32)__pa(&p_first_CCWB -> read );
1813                         }
1814
1815                         p_first_CCWB=p_buf;
1816
1817                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1818                         /*  initialize read command */
1819                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1820                         p_buf-> read.cda = (__u32)__pa(p_buff);
1821                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1822                         p_buf-> read.count       = privptr->p_env->read_size;
1823
1824                         /*  initialize read_h command */
1825                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1826                         p_buf-> read_h.cda =
1827                                 (__u32)__pa(&(p_buf->header));
1828                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1829                         p_buf-> read_h.count      = sizeof(struct clawh);
1830
1831                         /*  initialize Signal command */
1832                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1833                         p_buf-> signal.cda =
1834                                 (__u32)__pa(&(pClawH->flag));
1835                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1836                         p_buf-> signal.count     = 1;
1837
1838                         /*  initialize r_TIC_1 command */
1839                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1840                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1841                         p_buf-> r_TIC_1.flags = 0;
1842                         p_buf-> r_TIC_1.count      = 0;
1843
1844                         /*  initialize r_read_FF command */
1845                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1846                         p_buf-> r_read_FF.cda =
1847                                 (__u32)__pa(&(pClawH->flag));
1848                         p_buf-> r_read_FF.flags =
1849                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1850                         p_buf-> r_read_FF.count    = 1;
1851
1852                         /*    initialize r_TIC_2          */
1853                         memcpy(&p_buf->r_TIC_2,
1854                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1855
1856                         /*     initialize Header     */
1857                         p_buf->header.length=0xffff;
1858                         p_buf->header.opcode=0xff;
1859                         p_buf->header.flag=CLAW_PENDING;
1860
1861                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1862                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1863                                  -1)
1864                            & PAGE_MASK)) {
1865                                 p_buff= p_buff+privptr->p_env->read_size;
1866                         }
1867                         else {
1868                                 p_buff=
1869                                 (void *)((unsigned long)
1870                                         (p_buff+2*(privptr->p_env->read_size)-1)
1871                                          & PAGE_MASK) ;
1872                         }
1873                 }   /* for read_buffers   */
1874           }         /* read_size < PAGE_SIZE  */
1875           else {  /* read Size >= PAGE_SIZE  */
1876                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1877                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1878                                 (int)pages_to_order_of_mag(
1879                                         privptr->p_buff_pages_perread));
1880                         if (p_buff==NULL) {
1881                                 free_pages((unsigned long)privptr->p_buff_ccw,
1882                                         (int)pages_to_order_of_mag(privptr->
1883                                         p_buff_ccw_num));
1884                                 /* free the write pages  */
1885                                 p_buf=privptr->p_buff_write;
1886                                 while (p_buf!=NULL) {
1887                                         free_pages(
1888                                             (unsigned long)p_buf->p_buffer,
1889                                             (int)pages_to_order_of_mag(
1890                                             privptr->p_buff_pages_perwrite));
1891                                         p_buf=p_buf->next;
1892                                 }
1893                                 /* free any read pages already alloc  */
1894                                 p_buf=privptr->p_buff_read;
1895                                 while (p_buf!=NULL) {
1896                                         free_pages(
1897                                             (unsigned long)p_buf->p_buffer,
1898                                             (int)pages_to_order_of_mag(
1899                                              privptr->p_buff_pages_perread));
1900                                         p_buf=p_buf->next;
1901                                 }
1902                                 privptr->p_buff_ccw=NULL;
1903                                 privptr->p_buff_write=NULL;
1904                                 return -ENOMEM;
1905                         }
1906                         memset(p_buff, 0x00, privptr->p_env->read_size);
1907                         p_buf        = p_free_chain;
1908                         privptr->p_buff_read = p_buf;
1909                         p_free_chain = p_buf->next;
1910
1911                         if (p_last_CCWB==NULL) {
1912                                 p_buf->next=NULL;
1913                                 real_TIC_address=0;
1914                                 p_last_CCWB=p_buf;
1915                         }
1916                         else {
1917                                 p_buf->next=p_first_CCWB;
1918                                 real_TIC_address=
1919                                         (addr_t)__pa(
1920                                                 &p_first_CCWB -> read );
1921                         }
1922
1923                         p_first_CCWB=p_buf;
1924                                 /* save buff address */
1925                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1926                         /*  initialize read command */
1927                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1928                         p_buf-> read.cda = (__u32)__pa(p_buff);
1929                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1930                         p_buf-> read.count       = privptr->p_env->read_size;
1931
1932                         /*  initialize read_h command */
1933                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1934                         p_buf-> read_h.cda =
1935                                 (__u32)__pa(&(p_buf->header));
1936                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1937                         p_buf-> read_h.count      = sizeof(struct clawh);
1938
1939                         /*  initialize Signal command */
1940                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1941                         p_buf-> signal.cda =
1942                                 (__u32)__pa(&(pClawH->flag));
1943                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1944                         p_buf-> signal.count     = 1;
1945
1946                         /*  initialize r_TIC_1 command */
1947                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1948                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1949                         p_buf-> r_TIC_1.flags = 0;
1950                         p_buf-> r_TIC_1.count      = 0;
1951
1952                         /*  initialize r_read_FF command */
1953                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1954                         p_buf-> r_read_FF.cda =
1955                                 (__u32)__pa(&(pClawH->flag));
1956                         p_buf-> r_read_FF.flags =
1957                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1958                         p_buf-> r_read_FF.count    = 1;
1959
1960                         /*    initialize r_TIC_2          */
1961                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1962                                 sizeof(struct ccw1));
1963
1964                         /*     initialize Header     */
1965                         p_buf->header.length=0xffff;
1966                         p_buf->header.opcode=0xff;
1967                         p_buf->header.flag=CLAW_PENDING;
1968
1969                 }    /* For read_buffers   */
1970           }     /*  read_size >= PAGE_SIZE   */
1971         }       /*  pBuffread = NULL */
1972         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1973         privptr->buffs_alloc = 1;
1974
1975         return 0;
1976 }    /*    end of init_ccw_bk */
1977
1978 /*-------------------------------------------------------------------*
1979 *                                                                    *
1980 *       probe_error                                                  *
1981 *                                                                    *
1982 *--------------------------------------------------------------------*/
1983
1984 static void
1985 probe_error( struct ccwgroup_device *cgdev)
1986 {
1987         struct claw_privbk *privptr;
1988
1989         CLAW_DBF_TEXT(4, trace, "proberr");
1990         privptr = (struct claw_privbk *) cgdev->dev.driver_data;
1991         if (privptr != NULL) {
1992                 cgdev->dev.driver_data = NULL;
1993                 kfree(privptr->p_env);
1994                 kfree(privptr->p_mtc_envelope);
1995                 kfree(privptr);
1996         }
1997 }    /*    probe_error    */
1998
1999 /*-------------------------------------------------------------------*
2000 *    claw_process_control                                            *
2001 *                                                                    *
2002 *                                                                    *
2003 *--------------------------------------------------------------------*/
2004
2005 static int
2006 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
2007 {
2008
2009         struct clawbuf *p_buf;
2010         struct clawctl  ctlbk;
2011         struct clawctl *p_ctlbk;
2012         char    temp_host_name[8];
2013         char    temp_ws_name[8];
2014         struct claw_privbk *privptr;
2015         struct claw_env *p_env;
2016         struct sysval *p_sysval;
2017         struct conncmd *p_connect=NULL;
2018         int rc;
2019         struct chbk *p_ch = NULL;
2020         struct device *tdev;
2021         CLAW_DBF_TEXT(2, setup, "clw_cntl");
2022         udelay(1000);  /* Wait a ms for the control packets to
2023                         *catch up to each other */
2024         privptr = dev->ml_priv;
2025         p_env=privptr->p_env;
2026         tdev = &privptr->channel[READ].cdev->dev;
2027         memcpy( &temp_host_name, p_env->host_name, 8);
2028         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2029         dev_info(tdev, "%s: CLAW device %.8s: "
2030                 "Received Control Packet\n",
2031                 dev->name, temp_ws_name);
2032         if (privptr->release_pend==1) {
2033                 return 0;
2034         }
2035         p_buf=p_ccw->p_buffer;
2036         p_ctlbk=&ctlbk;
2037         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2038                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2039         } else {
2040                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2041         }
2042         switch (p_ctlbk->command)
2043         {
2044         case SYSTEM_VALIDATE_REQUEST:
2045                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2046                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2047                                 CLAW_RC_WRONG_VERSION);
2048                         dev_warn(tdev, "The communication peer of %s"
2049                                 " uses an incorrect API version %d\n",
2050                                 dev->name, p_ctlbk->version);
2051                 }
2052                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2053                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2054                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2055                         "Host name=%.8s\n",
2056                         dev->name, p_ctlbk->version,
2057                         p_ctlbk->linkid,
2058                         p_ctlbk->correlator,
2059                         p_sysval->WS_name,
2060                         p_sysval->host_name);
2061                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2062                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2063                                 CLAW_RC_NAME_MISMATCH);
2064                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2065                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2066                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2067                         dev_warn(tdev,
2068                                 "Host name %s for %s does not match the"
2069                                 " remote adapter name %s\n",
2070                                 p_sysval->host_name,
2071                                 dev->name,
2072                                 temp_host_name);
2073                 }
2074                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2075                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2076                                 CLAW_RC_NAME_MISMATCH);
2077                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2078                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2079                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2080                         dev_warn(tdev, "Adapter name %s for %s does not match"
2081                                 " the remote host name %s\n",
2082                                 p_sysval->WS_name,
2083                                 dev->name,
2084                                 temp_ws_name);
2085                 }
2086                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2087                     (p_env->packing == 0)) {
2088                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2089                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2090                         dev_warn(tdev,
2091                                 "The local write buffer is smaller than the"
2092                                 " remote read buffer\n");
2093                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2094                 }
2095                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2096                     (p_env->packing == 0)) {
2097                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2098                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2099                         dev_warn(tdev,
2100                                 "The local read buffer is smaller than the"
2101                                 " remote write buffer\n");
2102                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2103                 }
2104                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2105                 dev_info(tdev,
2106                         "CLAW device %.8s: System validate"
2107                         " completed.\n", temp_ws_name);
2108                 dev_info(tdev,
2109                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2110                         dev->name, p_sysval->read_frame_size,
2111                         p_sysval->write_frame_size);
2112                 privptr->system_validate_comp = 1;
2113                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2114                         p_env->packing = PACKING_ASK;
2115                 claw_strt_conn_req(dev);
2116                 break;
2117         case SYSTEM_VALIDATE_RESPONSE:
2118                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2119                 dev_info(tdev,
2120                         "Settings for %s validated (version=%d, "
2121                         "remote device=%d, rc=%d, adapter name=%.8s, "
2122                         "host name=%.8s)\n",
2123                         dev->name,
2124                         p_ctlbk->version,
2125                         p_ctlbk->correlator,
2126                         p_ctlbk->rc,
2127                         p_sysval->WS_name,
2128                         p_sysval->host_name);
2129                 switch (p_ctlbk->rc) {
2130                 case 0:
2131                         dev_info(tdev, "%s: CLAW device "
2132                                 "%.8s: System validate completed.\n",
2133                                 dev->name, temp_ws_name);
2134                         if (privptr->system_validate_comp == 0)
2135                                 claw_strt_conn_req(dev);
2136                         privptr->system_validate_comp = 1;
2137                         break;
2138                 case CLAW_RC_NAME_MISMATCH:
2139                         dev_warn(tdev, "Validating %s failed because of"
2140                                 " a host or adapter name mismatch\n",
2141                                 dev->name);
2142                         break;
2143                 case CLAW_RC_WRONG_VERSION:
2144                         dev_warn(tdev, "Validating %s failed because of a"
2145                                 " version conflict\n",
2146                                 dev->name);
2147                         break;
2148                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2149                         dev_warn(tdev, "Validating %s failed because of a"
2150                                 " frame size conflict\n",
2151                                 dev->name);
2152                         break;
2153                 default:
2154                         dev_warn(tdev, "The communication peer of %s rejected"
2155                                 " the connection\n",
2156                                  dev->name);
2157                         break;
2158                 }
2159                 break;
2160
2161         case CONNECTION_REQUEST:
2162                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2163                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2164                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2165                         dev->name,
2166                         p_ctlbk->version,
2167                         p_ctlbk->linkid,
2168                         p_ctlbk->correlator,
2169                         p_connect->host_name,
2170                         p_connect->WS_name);
2171                 if (privptr->active_link_ID != 0) {
2172                         claw_snd_disc(dev, p_ctlbk);
2173                         dev_info(tdev, "%s rejected a connection request"
2174                                 " because it is already active\n",
2175                                 dev->name);
2176                 }
2177                 if (p_ctlbk->linkid != 1) {
2178                         claw_snd_disc(dev, p_ctlbk);
2179                         dev_info(tdev, "%s rejected a request to open multiple"
2180                                 " connections\n",
2181                                 dev->name);
2182                 }
2183                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2184                 if (rc != 0) {
2185                         claw_snd_disc(dev, p_ctlbk);
2186                         dev_info(tdev, "%s rejected a connection request"
2187                                 " because of a type mismatch\n",
2188                                 dev->name);
2189                 }
2190                 claw_send_control(dev,
2191                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2192                         p_ctlbk->correlator,
2193                         0, p_connect->host_name,
2194                         p_connect->WS_name);
2195                 if (p_env->packing == PACKING_ASK) {
2196                         p_env->packing = PACK_SEND;
2197                         claw_snd_conn_req(dev, 0);
2198                 }
2199                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2200                         "completed link_id=%d.\n",
2201                         dev->name, temp_ws_name,
2202                         p_ctlbk->linkid);
2203                         privptr->active_link_ID = p_ctlbk->linkid;
2204                         p_ch = &privptr->channel[WRITE];
2205                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2206                 break;
2207         case CONNECTION_RESPONSE:
2208                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2209                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2210                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2211                         dev->name,
2212                         p_ctlbk->version,
2213                         p_ctlbk->linkid,
2214                         p_ctlbk->correlator,
2215                         p_ctlbk->rc,
2216                         p_connect->host_name,
2217                         p_connect->WS_name);
2218
2219                 if (p_ctlbk->rc != 0) {
2220                         dev_warn(tdev, "The communication peer of %s rejected"
2221                                 " a connection request\n",
2222                                 dev->name);
2223                         return 1;
2224                 }
2225                 rc = find_link(dev,
2226                         p_connect->host_name, p_connect->WS_name);
2227                 if (rc != 0) {
2228                         claw_snd_disc(dev, p_ctlbk);
2229                         dev_warn(tdev, "The communication peer of %s"
2230                                 " rejected a connection "
2231                                 "request because of a type mismatch\n",
2232                                  dev->name);
2233                 }
2234                 /* should be until CONNECTION_CONFIRM */
2235                 privptr->active_link_ID = -(p_ctlbk->linkid);
2236                 break;
2237         case CONNECTION_CONFIRM:
2238                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2239                 dev_info(tdev,
2240                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2241                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2242                         dev->name,
2243                         p_ctlbk->version,
2244                         p_ctlbk->linkid,
2245                         p_ctlbk->correlator,
2246                         p_connect->host_name,
2247                         p_connect->WS_name);
2248                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2249                         privptr->active_link_ID = p_ctlbk->linkid;
2250                         if (p_env->packing > PACKING_ASK) {
2251                                 dev_info(tdev,
2252                                 "%s: Confirmed Now packing\n", dev->name);
2253                                 p_env->packing = DO_PACKED;
2254                         }
2255                         p_ch = &privptr->channel[WRITE];
2256                         wake_up(&p_ch->wait);
2257                 } else {
2258                         dev_warn(tdev, "Activating %s failed because of"
2259                                 " an incorrect link ID=%d\n",
2260                                 dev->name, p_ctlbk->linkid);
2261                         claw_snd_disc(dev, p_ctlbk);
2262                 }
2263                 break;
2264         case DISCONNECT:
2265                 dev_info(tdev, "%s: Disconnect: "
2266                         "Vers=%d,link_id=%d,Corr=%d\n",
2267                         dev->name, p_ctlbk->version,
2268                         p_ctlbk->linkid, p_ctlbk->correlator);
2269                 if ((p_ctlbk->linkid == 2) &&
2270                     (p_env->packing == PACK_SEND)) {
2271                         privptr->active_link_ID = 1;
2272                         p_env->packing = DO_PACKED;
2273                 } else
2274                         privptr->active_link_ID = 0;
2275                 break;
2276         case CLAW_ERROR:
2277                 dev_warn(tdev, "The communication peer of %s failed\n",
2278                         dev->name);
2279                 break;
2280         default:
2281                 dev_warn(tdev, "The communication peer of %s sent"
2282                         " an unknown command code\n",
2283                         dev->name);
2284                 break;
2285         }
2286
2287         return 0;
2288 }   /*    end of claw_process_control    */
2289
2290
2291 /*-------------------------------------------------------------------*
2292 *               claw_send_control                                    *
2293 *                                                                    *
2294 *--------------------------------------------------------------------*/
2295
2296 static int
2297 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2298          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2299 {
2300         struct claw_privbk              *privptr;
2301         struct clawctl                  *p_ctl;
2302         struct sysval                   *p_sysval;
2303         struct conncmd                  *p_connect;
2304         struct sk_buff                  *skb;
2305
2306         CLAW_DBF_TEXT(2, setup, "sndcntl");
2307         privptr = dev->ml_priv;
2308         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2309
2310         p_ctl->command=type;
2311         p_ctl->version=CLAW_VERSION_ID;
2312         p_ctl->linkid=link;
2313         p_ctl->correlator=correlator;
2314         p_ctl->rc=rc;
2315
2316         p_sysval=(struct sysval *)&p_ctl->data;
2317         p_connect=(struct conncmd *)&p_ctl->data;
2318
2319         switch (p_ctl->command) {
2320                 case SYSTEM_VALIDATE_REQUEST:
2321                 case SYSTEM_VALIDATE_RESPONSE:
2322                         memcpy(&p_sysval->host_name, local_name, 8);
2323                         memcpy(&p_sysval->WS_name, remote_name, 8);
2324                         if (privptr->p_env->packing > 0) {
2325                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2326                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2327                         } else {
2328                                 /* how big is the biggest group of packets */
2329                            p_sysval->read_frame_size =
2330                                 privptr->p_env->read_size;
2331                            p_sysval->write_frame_size =
2332                                 privptr->p_env->write_size;
2333                         }
2334                         memset(&p_sysval->reserved, 0x00, 4);
2335                         break;
2336                 case CONNECTION_REQUEST:
2337                 case CONNECTION_RESPONSE:
2338                 case CONNECTION_CONFIRM:
2339                 case DISCONNECT:
2340                         memcpy(&p_sysval->host_name, local_name, 8);
2341                         memcpy(&p_sysval->WS_name, remote_name, 8);
2342                         if (privptr->p_env->packing > 0) {
2343                         /* How big is the biggest packet */
2344                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2345                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2346                         } else {
2347                                 memset(&p_connect->reserved1, 0x00, 4);
2348                                 memset(&p_connect->reserved2, 0x00, 4);
2349                         }
2350                         break;
2351                 default:
2352                         break;
2353         }
2354
2355         /*      write Control Record to the device                   */
2356
2357
2358         skb = dev_alloc_skb(sizeof(struct clawctl));
2359         if (!skb) {
2360                 return -ENOMEM;
2361         }
2362         memcpy(skb_put(skb, sizeof(struct clawctl)),
2363                 p_ctl, sizeof(struct clawctl));
2364         if (privptr->p_env->packing >= PACK_SEND)
2365                 claw_hw_tx(skb, dev, 1);
2366         else
2367                 claw_hw_tx(skb, dev, 0);
2368         return 0;
2369 }  /*   end of claw_send_control  */
2370
2371 /*-------------------------------------------------------------------*
2372 *               claw_snd_conn_req                                    *
2373 *                                                                    *
2374 *--------------------------------------------------------------------*/
2375 static int
2376 claw_snd_conn_req(struct net_device *dev, __u8 link)
2377 {
2378         int                rc;
2379         struct claw_privbk *privptr = dev->ml_priv;
2380         struct clawctl     *p_ctl;
2381
2382         CLAW_DBF_TEXT(2, setup, "snd_conn");
2383         rc = 1;
2384         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2385         p_ctl->linkid = link;
2386         if ( privptr->system_validate_comp==0x00 ) {
2387                 return rc;
2388         }
2389         if (privptr->p_env->packing == PACKING_ASK )
2390                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2391                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2392         if (privptr->p_env->packing == PACK_SEND)  {
2393                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2394                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2395         }
2396         if (privptr->p_env->packing == 0)
2397                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2398                         HOST_APPL_NAME, privptr->p_env->api_type);
2399         return rc;
2400
2401 }  /*  end of claw_snd_conn_req */
2402
2403
2404 /*-------------------------------------------------------------------*
2405 *               claw_snd_disc                                        *
2406 *                                                                    *
2407 *--------------------------------------------------------------------*/
2408
2409 static int
2410 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2411 {
2412         int rc;
2413         struct conncmd *  p_connect;
2414
2415         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2416         p_connect=(struct conncmd *)&p_ctl->data;
2417
2418         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2419                 p_ctl->correlator, 0,
2420                 p_connect->host_name, p_connect->WS_name);
2421         return rc;
2422 }     /*   end of claw_snd_disc    */
2423
2424
2425 /*-------------------------------------------------------------------*
2426 *               claw_snd_sys_validate_rsp                            *
2427 *                                                                    *
2428 *--------------------------------------------------------------------*/
2429
2430 static int
2431 claw_snd_sys_validate_rsp(struct net_device *dev,
2432         struct clawctl *p_ctl, __u32 return_code)
2433 {
2434         struct claw_env *  p_env;
2435         struct claw_privbk *privptr;
2436         int    rc;
2437
2438         CLAW_DBF_TEXT(2, setup, "chkresp");
2439         privptr = dev->ml_priv;
2440         p_env=privptr->p_env;
2441         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2442                 p_ctl->linkid,
2443                 p_ctl->correlator,
2444                 return_code,
2445                 p_env->host_name,
2446                 p_env->adapter_name  );
2447         return rc;
2448 }     /*    end of claw_snd_sys_validate_rsp    */
2449
2450 /*-------------------------------------------------------------------*
2451 *               claw_strt_conn_req                                   *
2452 *                                                                    *
2453 *--------------------------------------------------------------------*/
2454
2455 static int
2456 claw_strt_conn_req(struct net_device *dev )
2457 {
2458         int rc;
2459
2460         CLAW_DBF_TEXT(2, setup, "conn_req");
2461         rc=claw_snd_conn_req(dev, 1);
2462         return rc;
2463 }    /*   end of claw_strt_conn_req   */
2464
2465
2466
2467 /*-------------------------------------------------------------------*
2468  *   claw_stats                                                      *
2469  *-------------------------------------------------------------------*/
2470
2471 static struct
2472 net_device_stats *claw_stats(struct net_device *dev)
2473 {
2474         struct claw_privbk *privptr;
2475
2476         CLAW_DBF_TEXT(4, trace, "stats");
2477         privptr = dev->ml_priv;
2478         return &privptr->stats;
2479 }     /*   end of claw_stats   */
2480
2481
2482 /*-------------------------------------------------------------------*
2483 *       unpack_read                                                  *
2484 *                                                                    *
2485 *--------------------------------------------------------------------*/
2486 static void
2487 unpack_read(struct net_device *dev )
2488 {
2489         struct sk_buff *skb;
2490         struct claw_privbk *privptr;
2491         struct claw_env    *p_env;
2492         struct ccwbk    *p_this_ccw;
2493         struct ccwbk    *p_first_ccw;
2494         struct ccwbk    *p_last_ccw;
2495         struct clawph   *p_packh;
2496         void            *p_packd;
2497         struct clawctl  *p_ctlrec=NULL;
2498         struct device   *p_dev;
2499
2500         __u32   len_of_data;
2501         __u32   pack_off;
2502         __u8    link_num;
2503         __u8    mtc_this_frm=0;
2504         __u32   bytes_to_mov;
2505         int     i=0;
2506         int     p=0;
2507
2508         CLAW_DBF_TEXT(4, trace, "unpkread");
2509         p_first_ccw=NULL;
2510         p_last_ccw=NULL;
2511         p_packh=NULL;
2512         p_packd=NULL;
2513         privptr = dev->ml_priv;
2514
2515         p_dev = &privptr->channel[READ].cdev->dev;
2516         p_env = privptr->p_env;
2517         p_this_ccw=privptr->p_read_active_first;
2518         i=0;
2519         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2520                 pack_off = 0;
2521                 p = 0;
2522                 p_this_ccw->header.flag=CLAW_PENDING;
2523                 privptr->p_read_active_first=p_this_ccw->next;
2524                 p_this_ccw->next=NULL;
2525                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2526                 if ((p_env->packing == PACK_SEND) &&
2527                     (p_packh->len == 32)           &&
2528                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2529                         p_packh++;  /* peek past pack header */
2530                         p_ctlrec = (struct clawctl *)p_packh;
2531                         p_packh--;  /* un peek */
2532                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2533                             (p_ctlrec->command == CONNECTION_CONFIRM))
2534                                 p_env->packing = DO_PACKED;
2535                 }
2536                 if (p_env->packing == DO_PACKED)
2537                         link_num=p_packh->link_num;
2538                 else
2539                         link_num=p_this_ccw->header.opcode / 8;
2540                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2541                         mtc_this_frm=1;
2542                         if (p_this_ccw->header.length!=
2543                                 privptr->p_env->read_size ) {
2544                                 dev_warn(p_dev,
2545                                         "The communication peer of %s"
2546                                         " sent a faulty"
2547                                         " frame of length %02x\n",
2548                                         dev->name, p_this_ccw->header.length);
2549                         }
2550                 }
2551
2552                 if (privptr->mtc_skipping) {
2553                         /*
2554                         *   We're in the mode of skipping past a
2555                         *   multi-frame message
2556                         *   that we can't process for some reason or other.
2557                         *   The first frame without the More-To-Come flag is
2558                         *   the last frame of the skipped message.
2559                         */
2560                         /*  in case of More-To-Come not set in this frame */
2561                         if (mtc_this_frm==0) {
2562                                 privptr->mtc_skipping=0; /* Ok, the end */
2563                                 privptr->mtc_logical_link=-1;
2564                         }
2565                         goto NextFrame;
2566                 }
2567
2568                 if (link_num==0) {
2569                         claw_process_control(dev, p_this_ccw);
2570                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2571                         goto NextFrame;
2572                 }
2573 unpack_next:
2574                 if (p_env->packing == DO_PACKED) {
2575                         if (pack_off > p_env->read_size)
2576                                 goto NextFrame;
2577                         p_packd = p_this_ccw->p_buffer+pack_off;
2578                         p_packh = (struct clawph *) p_packd;
2579                         if ((p_packh->len == 0) || /* done with this frame? */
2580                             (p_packh->flag != 0))
2581                                 goto NextFrame;
2582                         bytes_to_mov = p_packh->len;
2583                         pack_off += bytes_to_mov+sizeof(struct clawph);
2584                         p++;
2585                 } else {
2586                         bytes_to_mov=p_this_ccw->header.length;
2587                 }
2588                 if (privptr->mtc_logical_link<0) {
2589
2590                 /*
2591                 *  if More-To-Come is set in this frame then we don't know
2592                 *  length of entire message, and hence have to allocate
2593                 *  large buffer   */
2594
2595                 /*      We are starting a new envelope  */
2596                 privptr->mtc_offset=0;
2597                         privptr->mtc_logical_link=link_num;
2598                 }
2599
2600                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2601                         /*      error     */
2602                         privptr->stats.rx_frame_errors++;
2603                         goto NextFrame;
2604                 }
2605                 if (p_env->packing == DO_PACKED) {
2606                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2607                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2608
2609                 } else  {
2610                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2611                                 p_this_ccw->p_buffer, bytes_to_mov);
2612                 }
2613                 if (mtc_this_frm==0) {
2614                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2615                         skb=dev_alloc_skb(len_of_data);
2616                         if (skb) {
2617                                 memcpy(skb_put(skb,len_of_data),
2618                                         privptr->p_mtc_envelope,
2619                                         len_of_data);
2620                                 skb->dev=dev;
2621                                 skb_reset_mac_header(skb);
2622                                 skb->protocol=htons(ETH_P_IP);
2623                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2624                                 privptr->stats.rx_packets++;
2625                                 privptr->stats.rx_bytes+=len_of_data;
2626                                 netif_rx(skb);
2627                         }
2628                         else {
2629                                 dev_info(p_dev, "Allocating a buffer for"
2630                                         " incoming data failed\n");
2631                                 privptr->stats.rx_dropped++;
2632                         }
2633                         privptr->mtc_offset=0;
2634                         privptr->mtc_logical_link=-1;
2635                 }
2636                 else {
2637                         privptr->mtc_offset+=bytes_to_mov;
2638                 }
2639                 if (p_env->packing == DO_PACKED)
2640                         goto unpack_next;
2641 NextFrame:
2642                 /*
2643                 *   Remove ThisCCWblock from active read queue, and add it
2644                 *   to queue of free blocks to be reused.
2645                 */
2646                 i++;
2647                 p_this_ccw->header.length=0xffff;
2648                 p_this_ccw->header.opcode=0xff;
2649                 /*
2650                 *       add this one to the free queue for later reuse
2651                 */
2652                 if (p_first_ccw==NULL) {
2653                         p_first_ccw = p_this_ccw;
2654                 }
2655                 else {
2656                         p_last_ccw->next = p_this_ccw;
2657                 }
2658                 p_last_ccw = p_this_ccw;
2659                 /*
2660                 *       chain to next block on active read queue
2661                 */
2662                 p_this_ccw = privptr->p_read_active_first;
2663                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2664         } /* end of while */
2665
2666         /*      check validity                  */
2667
2668         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2669         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2670         claw_strt_read(dev, LOCK_YES);
2671         return;
2672 }     /*  end of unpack_read   */
2673
2674 /*-------------------------------------------------------------------*
2675 *       claw_strt_read                                               *
2676 *                                                                    *
2677 *--------------------------------------------------------------------*/
2678 static void
2679 claw_strt_read (struct net_device *dev, int lock )
2680 {
2681         int        rc = 0;
2682         __u32      parm;
2683         unsigned long  saveflags = 0;
2684         struct claw_privbk *privptr = dev->ml_priv;
2685         struct ccwbk*p_ccwbk;
2686         struct chbk *p_ch;
2687         struct clawh *p_clawh;
2688         p_ch=&privptr->channel[READ];
2689
2690         CLAW_DBF_TEXT(4, trace, "StRdNter");
2691         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2692         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2693
2694         if ((privptr->p_write_active_first!=NULL &&
2695              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2696             (privptr->p_read_active_first!=NULL &&
2697              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2698                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2699         }
2700         if (lock==LOCK_YES) {
2701                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2702         }
2703         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2704                 CLAW_DBF_TEXT(4, trace, "HotRead");
2705                 p_ccwbk=privptr->p_read_active_first;
2706                 parm = (unsigned long) p_ch;
2707                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2708                                        0xff, 0);
2709                 if (rc != 0) {
2710                         ccw_check_return_code(p_ch->cdev, rc);
2711                 }
2712         }
2713         else {
2714                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2715         }
2716
2717         if (lock==LOCK_YES) {
2718                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2719         }
2720         CLAW_DBF_TEXT(4, trace, "StRdExit");
2721         return;
2722 }       /*    end of claw_strt_read    */
2723
2724 /*-------------------------------------------------------------------*
2725 *       claw_strt_out_IO                                             *
2726 *                                                                    *
2727 *--------------------------------------------------------------------*/
2728
2729 static void
2730 claw_strt_out_IO( struct net_device *dev )
2731 {
2732         int                     rc = 0;
2733         unsigned long           parm;
2734         struct claw_privbk      *privptr;
2735         struct chbk             *p_ch;
2736         struct ccwbk    *p_first_ccw;
2737
2738         if (!dev) {
2739                 return;
2740         }
2741         privptr = (struct claw_privbk *)dev->ml_priv;
2742         p_ch=&privptr->channel[WRITE];
2743
2744         CLAW_DBF_TEXT(4, trace, "strt_io");
2745         p_first_ccw=privptr->p_write_active_first;
2746
2747         if (p_ch->claw_state == CLAW_STOP)
2748                 return;
2749         if (p_first_ccw == NULL) {
2750                 return;
2751         }
2752         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2753                 parm = (unsigned long) p_ch;
2754                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2755                 rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2756                                       0xff, 0);
2757                 if (rc != 0) {
2758                         ccw_check_return_code(p_ch->cdev, rc);
2759                 }
2760         }
2761         dev->trans_start = jiffies;
2762         return;
2763 }       /*    end of claw_strt_out_IO    */
2764
2765 /*-------------------------------------------------------------------*
2766 *       Free write buffers                                           *
2767 *                                                                    *
2768 *--------------------------------------------------------------------*/
2769
2770 static void
2771 claw_free_wrt_buf( struct net_device *dev )
2772 {
2773
2774         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2775         struct ccwbk*p_first_ccw;
2776         struct ccwbk*p_last_ccw;
2777         struct ccwbk*p_this_ccw;
2778         struct ccwbk*p_next_ccw;
2779
2780         CLAW_DBF_TEXT(4, trace, "freewrtb");
2781         /*  scan the write queue to free any completed write packets   */
2782         p_first_ccw=NULL;
2783         p_last_ccw=NULL;
2784         p_this_ccw=privptr->p_write_active_first;
2785         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2786         {
2787                 p_next_ccw = p_this_ccw->next;
2788                 if (((p_next_ccw!=NULL) &&
2789                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2790                     ((p_this_ccw == privptr->p_write_active_last) &&
2791                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2792                         /* The next CCW is OK or this is  */
2793                         /* the last CCW...free it   @A1A  */
2794                         privptr->p_write_active_first=p_this_ccw->next;
2795                         p_this_ccw->header.flag=CLAW_PENDING;
2796                         p_this_ccw->next=privptr->p_write_free_chain;
2797                         privptr->p_write_free_chain=p_this_ccw;
2798                         ++privptr->write_free_count;
2799                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2800                         p_this_ccw=privptr->p_write_active_first;
2801                         privptr->stats.tx_packets++;
2802                 }
2803                 else {
2804                         break;
2805                 }
2806         }
2807         if (privptr->write_free_count!=0) {
2808                 claw_clearbit_busy(TB_NOBUFFER,dev);
2809         }
2810         /*   whole chain removed?   */
2811         if (privptr->p_write_active_first==NULL) {
2812                 privptr->p_write_active_last=NULL;
2813         }
2814         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2815         return;
2816 }
2817
2818 /*-------------------------------------------------------------------*
2819 *       claw free netdevice                                          *
2820 *                                                                    *
2821 *--------------------------------------------------------------------*/
2822 static void
2823 claw_free_netdevice(struct net_device * dev, int free_dev)
2824 {
2825         struct claw_privbk *privptr;
2826
2827         CLAW_DBF_TEXT(2, setup, "free_dev");
2828         if (!dev)
2829                 return;
2830         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2831         privptr = dev->ml_priv;
2832         if (dev->flags & IFF_RUNNING)
2833                 claw_release(dev);
2834         if (privptr) {
2835                 privptr->channel[READ].ndev = NULL;  /* say it's free */
2836         }
2837         dev->ml_priv = NULL;
2838 #ifdef MODULE
2839         if (free_dev) {
2840                 free_netdev(dev);
2841         }
2842 #endif
2843         CLAW_DBF_TEXT(2, setup, "free_ok");
2844 }
2845
2846 /**
2847  * Claw init netdevice
2848  * Initialize everything of the net device except the name and the
2849  * channel structs.
2850  */
2851 static const struct net_device_ops claw_netdev_ops = {
2852         .ndo_open               = claw_open,
2853         .ndo_stop               = claw_release,
2854         .ndo_get_stats          = claw_stats,
2855         .ndo_start_xmit         = claw_tx,
2856         .ndo_change_mtu         = claw_change_mtu,
2857 };
2858
2859 static void
2860 claw_init_netdevice(struct net_device * dev)
2861 {
2862         CLAW_DBF_TEXT(2, setup, "init_dev");
2863         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2864         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2865         dev->hard_header_len = 0;
2866         dev->addr_len = 0;
2867         dev->type = ARPHRD_SLIP;
2868         dev->tx_queue_len = 1300;
2869         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2870         dev->netdev_ops = &claw_netdev_ops;
2871         CLAW_DBF_TEXT(2, setup, "initok");
2872         return;
2873 }
2874
2875 /**
2876  * Init a new channel in the privptr->channel[i].
2877  *
2878  * @param cdev  The ccw_device to be added.
2879  *
2880  * @return 0 on success, !0 on error.
2881  */
2882 static int
2883 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2884 {
2885         struct chbk *p_ch;
2886         struct ccw_dev_id dev_id;
2887
2888         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2889         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2890         p_ch = &privptr->channel[i];
2891         p_ch->cdev = cdev;
2892         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2893         ccw_device_get_id(cdev, &dev_id);
2894         p_ch->devno = dev_id.devno;
2895         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2896                 return -ENOMEM;
2897         }
2898         return 0;
2899 }
2900
2901
2902 /**
2903  *
2904  * Setup an interface.
2905  *
2906  * @param cgdev  Device to be setup.
2907  *
2908  * @returns 0 on success, !0 on failure.
2909  */
2910 static int
2911 claw_new_device(struct ccwgroup_device *cgdev)
2912 {
2913         struct claw_privbk *privptr;
2914         struct claw_env *p_env;
2915         struct net_device *dev;
2916         int ret;
2917         struct ccw_dev_id dev_id;
2918
2919         dev_info(&cgdev->dev, "add for %s\n",
2920                  dev_name(&cgdev->cdev[READ]->dev));
2921         CLAW_DBF_TEXT(2, setup, "new_dev");
2922         privptr = cgdev->dev.driver_data;
2923         cgdev->cdev[READ]->dev.driver_data = privptr;
2924         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2925         if (!privptr)
2926                 return -ENODEV;
2927         p_env = privptr->p_env;
2928         ccw_device_get_id(cgdev->cdev[READ], &dev_id);
2929         p_env->devno[READ] = dev_id.devno;
2930         ccw_device_get_id(cgdev->cdev[WRITE], &dev_id);
2931         p_env->devno[WRITE] = dev_id.devno;
2932         ret = add_channel(cgdev->cdev[0],0,privptr);
2933         if (ret == 0)
2934                 ret = add_channel(cgdev->cdev[1],1,privptr);
2935         if (ret != 0) {
2936                 dev_warn(&cgdev->dev, "Creating a CLAW group device"
2937                         " failed with error code %d\n", ret);
2938                 goto out;
2939         }
2940         ret = ccw_device_set_online(cgdev->cdev[READ]);
2941         if (ret != 0) {
2942                 dev_warn(&cgdev->dev,
2943                         "Setting the read subchannel online"
2944                         " failed with error code %d\n", ret);
2945                 goto out;
2946         }
2947         ret = ccw_device_set_online(cgdev->cdev[WRITE]);
2948         if (ret != 0) {
2949                 dev_warn(&cgdev->dev,
2950                         "Setting the write subchannel online "
2951                         "failed with error code %d\n", ret);
2952                 goto out;
2953         }
2954         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2955         if (!dev) {
2956                 dev_warn(&cgdev->dev,
2957                         "Activating the CLAW device failed\n");
2958                 goto out;
2959         }
2960         dev->ml_priv = privptr;
2961         cgdev->dev.driver_data = privptr;
2962         cgdev->cdev[READ]->dev.driver_data = privptr;
2963         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2964         /* sysfs magic */
2965         SET_NETDEV_DEV(dev, &cgdev->dev);
2966         if (register_netdev(dev) != 0) {
2967                 claw_free_netdevice(dev, 1);
2968                 CLAW_DBF_TEXT(2, trace, "regfail");
2969                 goto out;
2970         }
2971         dev->flags &=~IFF_RUNNING;
2972         if (privptr->buffs_alloc == 0) {
2973                 ret=init_ccw_bk(dev);
2974                 if (ret !=0) {
2975                         unregister_netdev(dev);
2976                         claw_free_netdevice(dev,1);
2977                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2978                         goto out;
2979                 }
2980         }
2981         privptr->channel[READ].ndev = dev;
2982         privptr->channel[WRITE].ndev = dev;
2983         privptr->p_env->ndev = dev;
2984
2985         dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2986                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2987                 dev->name, p_env->read_size,
2988                 p_env->write_size, p_env->read_buffers,
2989                 p_env->write_buffers, p_env->devno[READ],
2990                 p_env->devno[WRITE]);
2991         dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2992                 ":%.8s api_type: %.8s\n",
2993                 dev->name, p_env->host_name,
2994                 p_env->adapter_name , p_env->api_type);
2995         return 0;
2996 out:
2997         ccw_device_set_offline(cgdev->cdev[1]);
2998         ccw_device_set_offline(cgdev->cdev[0]);
2999         return -ENODEV;
3000 }
3001
3002 static void
3003 claw_purge_skb_queue(struct sk_buff_head *q)
3004 {
3005         struct sk_buff *skb;
3006
3007         CLAW_DBF_TEXT(4, trace, "purgque");
3008         while ((skb = skb_dequeue(q))) {
3009                 atomic_dec(&skb->users);
3010                 dev_kfree_skb_any(skb);
3011         }
3012 }
3013
3014 /**
3015  * Shutdown an interface.
3016  *
3017  * @param cgdev  Device to be shut down.
3018  *
3019  * @returns 0 on success, !0 on failure.
3020  */
3021 static int
3022 claw_shutdown_device(struct ccwgroup_device *cgdev)
3023 {
3024         struct claw_privbk *priv;
3025         struct net_device *ndev;
3026         int     ret;
3027
3028         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3029         priv = cgdev->dev.driver_data;
3030         if (!priv)
3031                 return -ENODEV;
3032         ndev = priv->channel[READ].ndev;
3033         if (ndev) {
3034                 /* Close the device */
3035                 dev_info(&cgdev->dev, "%s: shutting down \n",
3036                         ndev->name);
3037                 if (ndev->flags & IFF_RUNNING)
3038                         ret = claw_release(ndev);
3039                 ndev->flags &=~IFF_RUNNING;
3040                 unregister_netdev(ndev);
3041                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3042                 claw_free_netdevice(ndev, 1);
3043                 priv->channel[READ].ndev = NULL;
3044                 priv->channel[WRITE].ndev = NULL;
3045                 priv->p_env->ndev = NULL;
3046         }
3047         ccw_device_set_offline(cgdev->cdev[1]);
3048         ccw_device_set_offline(cgdev->cdev[0]);
3049         return 0;
3050 }
3051
3052 static void
3053 claw_remove_device(struct ccwgroup_device *cgdev)
3054 {
3055         struct claw_privbk *priv;
3056
3057         BUG_ON(!cgdev);
3058         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3059         priv = cgdev->dev.driver_data;
3060         BUG_ON(!priv);
3061         dev_info(&cgdev->dev, " will be removed.\n");
3062         if (cgdev->state == CCWGROUP_ONLINE)
3063                 claw_shutdown_device(cgdev);
3064         claw_remove_files(&cgdev->dev);
3065         kfree(priv->p_mtc_envelope);
3066         priv->p_mtc_envelope=NULL;
3067         kfree(priv->p_env);
3068         priv->p_env=NULL;
3069         kfree(priv->channel[0].irb);
3070         priv->channel[0].irb=NULL;
3071         kfree(priv->channel[1].irb);
3072         priv->channel[1].irb=NULL;
3073         kfree(priv);
3074         cgdev->dev.driver_data=NULL;
3075         cgdev->cdev[READ]->dev.driver_data = NULL;
3076         cgdev->cdev[WRITE]->dev.driver_data = NULL;
3077         put_device(&cgdev->dev);
3078
3079         return;
3080 }
3081
3082
3083 /*
3084  * sysfs attributes
3085  */
3086 static ssize_t
3087 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3088 {
3089         struct claw_privbk *priv;
3090         struct claw_env *  p_env;
3091
3092         priv = dev->driver_data;
3093         if (!priv)
3094                 return -ENODEV;
3095         p_env = priv->p_env;
3096         return sprintf(buf, "%s\n",p_env->host_name);
3097 }
3098
3099 static ssize_t
3100 claw_hname_write(struct device *dev, struct device_attribute *attr,
3101          const char *buf, size_t count)
3102 {
3103         struct claw_privbk *priv;
3104         struct claw_env *  p_env;
3105
3106         priv = dev->driver_data;
3107         if (!priv)
3108                 return -ENODEV;
3109         p_env = priv->p_env;
3110         if (count > MAX_NAME_LEN+1)
3111                 return -EINVAL;
3112         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3113         strncpy(p_env->host_name,buf, count);
3114         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3115         p_env->host_name[MAX_NAME_LEN] = 0x00;
3116         CLAW_DBF_TEXT(2, setup, "HstnSet");
3117         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3118
3119         return count;
3120 }
3121
3122 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3123
3124 static ssize_t
3125 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3126 {
3127         struct claw_privbk *priv;
3128         struct claw_env *  p_env;
3129
3130         priv = dev->driver_data;
3131         if (!priv)
3132                 return -ENODEV;
3133         p_env = priv->p_env;
3134         return sprintf(buf, "%s\n", p_env->adapter_name);
3135 }
3136
3137 static ssize_t
3138 claw_adname_write(struct device *dev, struct device_attribute *attr,
3139          const char *buf, size_t count)
3140 {
3141         struct claw_privbk *priv;
3142         struct claw_env *  p_env;
3143
3144         priv = dev->driver_data;
3145         if (!priv)
3146                 return -ENODEV;
3147         p_env = priv->p_env;
3148         if (count > MAX_NAME_LEN+1)
3149                 return -EINVAL;
3150         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3151         strncpy(p_env->adapter_name,buf, count);
3152         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3153         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3154         CLAW_DBF_TEXT(2, setup, "AdnSet");
3155         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3156
3157         return count;
3158 }
3159
3160 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3161
3162 static ssize_t
3163 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3164 {
3165         struct claw_privbk *priv;
3166         struct claw_env *  p_env;
3167
3168         priv = dev->driver_data;
3169         if (!priv)
3170                 return -ENODEV;
3171         p_env = priv->p_env;
3172         return sprintf(buf, "%s\n",
3173                        p_env->api_type);
3174 }
3175
3176 static ssize_t
3177 claw_apname_write(struct device *dev, struct device_attribute *attr,
3178         const char *buf, size_t count)
3179 {
3180         struct claw_privbk *priv;
3181         struct claw_env *  p_env;
3182
3183         priv = dev->driver_data;
3184         if (!priv)
3185                 return -ENODEV;
3186         p_env = priv->p_env;
3187         if (count > MAX_NAME_LEN+1)
3188                 return -EINVAL;
3189         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3190         strncpy(p_env->api_type,buf, count);
3191         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3192         p_env->api_type[MAX_NAME_LEN] = 0x00;
3193         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3194                 p_env->read_size=DEF_PACK_BUFSIZE;
3195                 p_env->write_size=DEF_PACK_BUFSIZE;
3196                 p_env->packing=PACKING_ASK;
3197                 CLAW_DBF_TEXT(2, setup, "PACKING");
3198         }
3199         else {
3200                 p_env->packing=0;
3201                 p_env->read_size=CLAW_FRAME_SIZE;
3202                 p_env->write_size=CLAW_FRAME_SIZE;
3203                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3204         }
3205         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3206         return count;
3207 }
3208
3209 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3210
3211 static ssize_t
3212 claw_wbuff_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->write_buffers);
3222 }
3223
3224 static ssize_t
3225 claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3226         const char *buf, size_t count)
3227 {
3228         struct claw_privbk *priv;
3229         struct claw_env *  p_env;
3230         int nnn,max;
3231
3232         priv = dev->driver_data;
3233         if (!priv)
3234                 return -ENODEV;
3235         p_env = priv->p_env;
3236         sscanf(buf, "%i", &nnn);
3237         if (p_env->packing) {
3238                 max = 64;
3239         }
3240         else {
3241                 max = 512;
3242         }
3243         if ((nnn > max ) || (nnn < 2))
3244                 return -EINVAL;
3245         p_env->write_buffers = nnn;
3246         CLAW_DBF_TEXT(2, setup, "Wbufset");
3247         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3248         return count;
3249 }
3250
3251 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3252
3253 static ssize_t
3254 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3255 {
3256         struct claw_privbk *priv;
3257         struct claw_env *  p_env;
3258
3259         priv = dev->driver_data;
3260         if (!priv)
3261                 return -ENODEV;
3262         p_env = priv->p_env;
3263         return sprintf(buf, "%d\n", p_env->read_buffers);
3264 }
3265
3266 static ssize_t
3267 claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3268         const char *buf, size_t count)
3269 {
3270         struct claw_privbk *priv;
3271         struct claw_env *p_env;
3272         int nnn,max;
3273
3274         priv = dev->driver_data;
3275         if (!priv)
3276                 return -ENODEV;
3277         p_env = priv->p_env;
3278         sscanf(buf, "%i", &nnn);
3279         if (p_env->packing) {
3280                 max = 64;
3281         }
3282         else {
3283                 max = 512;
3284         }
3285         if ((nnn > max ) || (nnn < 2))
3286                 return -EINVAL;
3287         p_env->read_buffers = nnn;
3288         CLAW_DBF_TEXT(2, setup, "Rbufset");
3289         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3290         return count;
3291 }
3292
3293 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3294
3295 static struct attribute *claw_attr[] = {
3296         &dev_attr_read_buffer.attr,
3297         &dev_attr_write_buffer.attr,
3298         &dev_attr_adapter_name.attr,
3299         &dev_attr_api_type.attr,
3300         &dev_attr_host_name.attr,
3301         NULL,
3302 };
3303
3304 static struct attribute_group claw_attr_group = {
3305         .attrs = claw_attr,
3306 };
3307
3308 static int
3309 claw_add_files(struct device *dev)
3310 {
3311         CLAW_DBF_TEXT(2, setup, "add_file");
3312         return sysfs_create_group(&dev->kobj, &claw_attr_group);
3313 }
3314
3315 static void
3316 claw_remove_files(struct device *dev)
3317 {
3318         CLAW_DBF_TEXT(2, setup, "rem_file");
3319         sysfs_remove_group(&dev->kobj, &claw_attr_group);
3320 }
3321
3322 /*--------------------------------------------------------------------*
3323 *    claw_init  and cleanup                                           *
3324 *---------------------------------------------------------------------*/
3325
3326 static void __exit
3327 claw_cleanup(void)
3328 {
3329         unregister_cu3088_discipline(&claw_group_driver);
3330         claw_unregister_debug_facility();
3331         pr_info("Driver unloaded\n");
3332
3333 }
3334
3335 /**
3336  * Initialize module.
3337  * This is called just after the module is loaded.
3338  *
3339  * @return 0 on success, !0 on error.
3340  */
3341 static int __init
3342 claw_init(void)
3343 {
3344         int ret = 0;
3345
3346         pr_info("Loading %s\n", version);
3347         ret = claw_register_debug_facility();
3348         if (ret) {
3349                 pr_err("Registering with the S/390 debug feature"
3350                         " failed with error code %d\n", ret);
3351                 return ret;
3352         }
3353         CLAW_DBF_TEXT(2, setup, "init_mod");
3354         ret = register_cu3088_discipline(&claw_group_driver);
3355         if (ret) {
3356                 CLAW_DBF_TEXT(2, setup, "init_bad");
3357                 claw_unregister_debug_facility();
3358                 pr_err("Registering with the cu3088 device driver failed "
3359                            "with error code %d\n", ret);
3360         }
3361         return ret;
3362 }
3363
3364 module_init(claw_init);
3365 module_exit(claw_cleanup);
3366
3367 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3368 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3369                         "Copyright 2000,2008 IBM Corporation\n");
3370 MODULE_LICENSE("GPL");