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   1 /*
   2  *  drivers/s390/net/claw.c
   3  *    ESCON CLAW network driver
   4  *
   5  *  Linux for zSeries version
   6  *    Copyright IBM Corp. 2002, 2009
   7  *  Author(s) Original code written by:
   8  *              Kazuo Iimura <iimura@jp.ibm.com>
   9  *            Rewritten by
  10  *              Andy Richter <richtera@us.ibm.com>
  11  *              Marc Price <mwprice@us.ibm.com>
  12  *
  13  *    sysfs parms:
  14  *   group x.x.rrrr,x.x.wwww
  15  *   read_buffer nnnnnnn
  16  *   write_buffer nnnnnn
  17  *   host_name  aaaaaaaa
  18  *   adapter_name aaaaaaaa
  19  *   api_type    aaaaaaaa
  20  *
  21  *  eg.
  22  *   group  0.0.0200 0.0.0201
  23  *   read_buffer 25
  24  *   write_buffer 20
  25  *   host_name LINUX390
  26  *   adapter_name RS6K
  27  *   api_type     TCPIP
  28  *
  29  *  where
  30  *
  31  *   The device id is decided by the order entries
  32  *   are added to the group the first is claw0 the second claw1
  33  *   up to CLAW_MAX_DEV
  34  *
  35  *   rrrr     - the first of 2 consecutive device addresses used for the
  36  *              CLAW protocol.
  37  *              The specified address is always used as the input (Read)
  38  *              channel and the next address is used as the output channel.
  39  *
  40  *   wwww     - the second of 2 consecutive device addresses used for
  41  *              the CLAW protocol.
  42  *              The specified address is always used as the output
  43  *              channel and the previous address is used as the input channel.
  44  *
  45  *   read_buffer        -       specifies number of input buffers to allocate.
  46  *   write_buffer       -       specifies number of output buffers to allocate.
  47  *   host_name          -       host name
  48  *   adaptor_name       -       adaptor name
  49  *   api_type           -       API type TCPIP or API will be sent and expected
  50  *                              as ws_name
  51  *
  52  *   Note the following requirements:
  53  *   1)  host_name must match the configured adapter_name on the remote side
  54  *   2)  adaptor_name must match the configured host name on the remote side
  55  *
  56  *  Change History
  57  *    1.00  Initial release shipped
  58  *    1.10  Changes for Buffer allocation
  59  *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
  60  *    1.25  Added Packing support
  61  *    1.5
  62  */
  63
  64 #define KMSG_COMPONENT "claw"
  65
  66 #include <asm/ccwdev.h>
  67 #include <asm/ccwgroup.h>
  68 #include <asm/debug.h>
  69 #include <asm/idals.h>
  70 #include <asm/io.h>
  71 #include <linux/bitops.h>
  72 #include <linux/ctype.h>
  73 #include <linux/delay.h>
  74 #include <linux/errno.h>
  75 #include <linux/if_arp.h>
  76 #include <linux/init.h>
  77 #include <linux/interrupt.h>
  78 #include <linux/ip.h>
  79 #include <linux/kernel.h>
  80 #include <linux/module.h>
  81 #include <linux/netdevice.h>
  82 #include <linux/etherdevice.h>
  83 #include <linux/proc_fs.h>
  84 #include <linux/sched.h>
  85 #include <linux/signal.h>
  86 #include <linux/skbuff.h>
  87 #include <linux/slab.h>
  88 #include <linux/string.h>
  89 #include <linux/tcp.h>
  90 #include <linux/timer.h>
  91 #include <linux/types.h>
  92
  93 #include "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 static int claw_pm_prepare(struct ccwgroup_device *gdev)
 257 {
 258         return -EPERM;
 259 }
 260
 261 /* ccwgroup table  */
 262
 263 static struct ccwgroup_driver claw_group_driver = {
 264         .owner       = THIS_MODULE,
 265         .name        = "claw",
 266         .max_slaves  = 2,
 267         .driver_id   = 0xC3D3C1E6,
 268         .probe       = claw_probe,
 269         .remove      = claw_remove_device,
 270         .set_online  = claw_new_device,
 271         .set_offline = claw_shutdown_device,
 272         .prepare     = claw_pm_prepare,
 273 };
 274
 275 /*
 276 *       Key functions
 277 */
 278
 279 /*----------------------------------------------------------------*
 280  *   claw_probe                                                   *
 281  *      this function is called for each CLAW device.             *
 282  *----------------------------------------------------------------*/
 283 static int
 284 claw_probe(struct ccwgroup_device *cgdev)
 285 {
 286         int             rc;
 287         struct claw_privbk *privptr=NULL;
 288
 289         CLAW_DBF_TEXT(2, setup, "probe");
 290         if (!get_device(&cgdev->dev))
 291                 return -ENODEV;
 292         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
 293         dev_set_drvdata(&cgdev->dev, privptr);
 294         if (privptr == NULL) {
 295                 probe_error(cgdev);
 296                 put_device(&cgdev->dev);
 297                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 298                 return -ENOMEM;
 299         }
 300         privptr->p_mtc_envelope= kzalloc( MAX_ENVELOPE_SIZE, GFP_KERNEL);
 301         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
 302         if ((privptr->p_mtc_envelope==NULL) || (privptr->p_env==NULL)) {
 303                 probe_error(cgdev);
 304                 put_device(&cgdev->dev);
 305                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
 306                 return -ENOMEM;
 307         }
 308         memcpy(privptr->p_env->adapter_name,WS_NAME_NOT_DEF,8);
 309         memcpy(privptr->p_env->host_name,WS_NAME_NOT_DEF,8);
 310         memcpy(privptr->p_env->api_type,WS_NAME_NOT_DEF,8);
 311         privptr->p_env->packing = 0;
 312         privptr->p_env->write_buffers = 5;
 313         privptr->p_env->read_buffers = 5;
 314         privptr->p_env->read_size = CLAW_FRAME_SIZE;
 315         privptr->p_env->write_size = CLAW_FRAME_SIZE;
 316         rc = claw_add_files(&cgdev->dev);
 317         if (rc) {
 318                 probe_error(cgdev);
 319                 put_device(&cgdev->dev);
 320                 dev_err(&cgdev->dev, "Creating the /proc files for a new"
 321                 " CLAW device failed\n");
 322                 CLAW_DBF_TEXT_(2, setup, "probex%d", rc);
 323                 return rc;
 324         }
 325         privptr->p_env->p_priv = privptr;
 326         cgdev->cdev[0]->handler = claw_irq_handler;
 327         cgdev->cdev[1]->handler = claw_irq_handler;
 328         CLAW_DBF_TEXT(2, setup, "prbext 0");
 329
 330         return 0;
 331 }  /*  end of claw_probe       */
 332
 333 /*-------------------------------------------------------------------*
 334  *   claw_tx                                                         *
 335  *-------------------------------------------------------------------*/
 336
 337 static int
 338 claw_tx(struct sk_buff *skb, struct net_device *dev)
 339 {
 340         int             rc;
 341         struct claw_privbk *privptr = dev->ml_priv;
 342         unsigned long saveflags;
 343         struct chbk *p_ch;
 344
 345         CLAW_DBF_TEXT(4, trace, "claw_tx");
 346         p_ch=&privptr->channel[WRITE];
 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         if (rc)
 352                 rc = NETDEV_TX_BUSY;
 353         else
 354                 rc = NETDEV_TX_OK;
 355         return rc;
 356 }   /*  end of claw_tx */
 357
 358 /*------------------------------------------------------------------*
 359  *  pack the collect queue into an skb and return it                *
 360  *   If not packing just return the top skb from the queue          *
 361  *------------------------------------------------------------------*/
 362
 363 static struct sk_buff *
 364 claw_pack_skb(struct claw_privbk *privptr)
 365 {
 366         struct sk_buff *new_skb,*held_skb;
 367         struct chbk *p_ch = &privptr->channel[WRITE];
 368         struct claw_env  *p_env = privptr->p_env;
 369         int     pkt_cnt,pk_ind,so_far;
 370
 371         new_skb = NULL;         /* assume no dice */
 372         pkt_cnt = 0;
 373         CLAW_DBF_TEXT(4, trace, "PackSKBe");
 374         if (!skb_queue_empty(&p_ch->collect_queue)) {
 375         /* some data */
 376                 held_skb = skb_dequeue(&p_ch->collect_queue);
 377                 if (held_skb)
 378                         dev_kfree_skb_any(held_skb);
 379                 else
 380                         return NULL;
 381                 if (p_env->packing != DO_PACKED)
 382                         return held_skb;
 383                 /* get a new SKB we will pack at least one */
 384                 new_skb = dev_alloc_skb(p_env->write_size);
 385                 if (new_skb == NULL) {
 386                         atomic_inc(&held_skb->users);
 387                         skb_queue_head(&p_ch->collect_queue,held_skb);
 388                         return NULL;
 389                 }
 390                 /* we have packed packet and a place to put it  */
 391                 pk_ind = 1;
 392                 so_far = 0;
 393                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 394                 while ((pk_ind) && (held_skb != NULL)) {
 395                         if (held_skb->len+so_far <= p_env->write_size-8) {
 396                                 memcpy(skb_put(new_skb,held_skb->len),
 397                                         held_skb->data,held_skb->len);
 398                                 privptr->stats.tx_packets++;
 399                                 so_far += held_skb->len;
 400                                 pkt_cnt++;
 401                                 dev_kfree_skb_any(held_skb);
 402                                 held_skb = skb_dequeue(&p_ch->collect_queue);
 403                                 if (held_skb)
 404                                         atomic_dec(&held_skb->users);
 405                         } else {
 406                                 pk_ind = 0;
 407                                 atomic_inc(&held_skb->users);
 408                                 skb_queue_head(&p_ch->collect_queue,held_skb);
 409                         }
 410                 }
 411         }
 412         CLAW_DBF_TEXT(4, trace, "PackSKBx");
 413         return new_skb;
 414 }
 415
 416 /*-------------------------------------------------------------------*
 417  *   claw_change_mtu                                                 *
 418  *                                                                   *
 419  *-------------------------------------------------------------------*/
 420
 421 static int
 422 claw_change_mtu(struct net_device *dev, int new_mtu)
 423 {
 424         struct claw_privbk *privptr = dev->ml_priv;
 425         int buff_size;
 426         CLAW_DBF_TEXT(4, trace, "setmtu");
 427         buff_size = privptr->p_env->write_size;
 428         if ((new_mtu < 60) || (new_mtu > buff_size)) {
 429                 return -EINVAL;
 430         }
 431         dev->mtu = new_mtu;
 432         return 0;
 433 }  /*   end of claw_change_mtu */
 434
 435
 436 /*-------------------------------------------------------------------*
 437  *   claw_open                                                       *
 438  *                                                                   *
 439  *-------------------------------------------------------------------*/
 440 static int
 441 claw_open(struct net_device *dev)
 442 {
 443
 444         int     rc;
 445         int     i;
 446         unsigned long       saveflags=0;
 447         unsigned long       parm;
 448         struct claw_privbk  *privptr;
 449         DECLARE_WAITQUEUE(wait, current);
 450         struct timer_list  timer;
 451         struct ccwbk *p_buf;
 452
 453         CLAW_DBF_TEXT(4, trace, "open");
 454         privptr = (struct claw_privbk *)dev->ml_priv;
 455         /*   allocate and initialize CCW blocks */
 456         if (privptr->buffs_alloc == 0) {
 457                 rc=init_ccw_bk(dev);
 458                 if (rc) {
 459                         CLAW_DBF_TEXT(2, trace, "openmem");
 460                         return -ENOMEM;
 461                 }
 462         }
 463         privptr->system_validate_comp=0;
 464         privptr->release_pend=0;
 465         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 466                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 467                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 468                 privptr->p_env->packing=PACKING_ASK;
 469         } else {
 470                 privptr->p_env->packing=0;
 471                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
 472                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
 473         }
 474         claw_set_busy(dev);
 475         tasklet_init(&privptr->channel[READ].tasklet, claw_irq_tasklet,
 476                 (unsigned long) &privptr->channel[READ]);
 477         for ( i = 0; i < 2;  i++) {
 478                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 479                 init_waitqueue_head(&privptr->channel[i].wait);
 480                 /* skb_queue_head_init(&p_ch->io_queue); */
 481                 if (i == WRITE)
 482                         skb_queue_head_init(
 483                                 &privptr->channel[WRITE].collect_queue);
 484                 privptr->channel[i].flag_a = 0;
 485                 privptr->channel[i].IO_active = 0;
 486                 privptr->channel[i].flag  &= ~CLAW_TIMER;
 487                 init_timer(&timer);
 488                 timer.function = (void *)claw_timer;
 489                 timer.data = (unsigned long)(&privptr->channel[i]);
 490                 timer.expires = jiffies + 15*HZ;
 491                 add_timer(&timer);
 492                 spin_lock_irqsave(get_ccwdev_lock(
 493                         privptr->channel[i].cdev), saveflags);
 494                 parm = (unsigned long) &privptr->channel[i];
 495                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 496                 rc = 0;
 497                 add_wait_queue(&privptr->channel[i].wait, &wait);
 498                 rc = ccw_device_halt(
 499                         (struct ccw_device *)privptr->channel[i].cdev,parm);
 500                 set_current_state(TASK_INTERRUPTIBLE);
 501                 spin_unlock_irqrestore(
 502                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 503                 schedule();
 504                 set_current_state(TASK_RUNNING);
 505                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 506                 if(rc != 0)
 507                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 508                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 509                         del_timer(&timer);
 510         }
 511         if ((((privptr->channel[READ].last_dstat |
 512                 privptr->channel[WRITE].last_dstat) &
 513            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 514            (((privptr->channel[READ].flag |
 515                 privptr->channel[WRITE].flag) & CLAW_TIMER) != 0x00)) {
 516                 dev_info(&privptr->channel[READ].cdev->dev,
 517                         "%s: remote side is not ready\n", dev->name);
 518                 CLAW_DBF_TEXT(2, trace, "notrdy");
 519
 520                 for ( i = 0; i < 2;  i++) {
 521                         spin_lock_irqsave(
 522                                 get_ccwdev_lock(privptr->channel[i].cdev),
 523                                 saveflags);
 524                         parm = (unsigned long) &privptr->channel[i];
 525                         privptr->channel[i].claw_state = CLAW_STOP;
 526                         rc = ccw_device_halt(
 527                                 (struct ccw_device *)&privptr->channel[i].cdev,
 528                                 parm);
 529                         spin_unlock_irqrestore(
 530                                 get_ccwdev_lock(privptr->channel[i].cdev),
 531                                 saveflags);
 532                         if (rc != 0) {
 533                                 ccw_check_return_code(
 534                                         privptr->channel[i].cdev, rc);
 535                         }
 536                 }
 537                 free_pages((unsigned long)privptr->p_buff_ccw,
 538                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 539                 if (privptr->p_env->read_size < PAGE_SIZE) {
 540                         free_pages((unsigned long)privptr->p_buff_read,
 541                                (int)pages_to_order_of_mag(
 542                                         privptr->p_buff_read_num));
 543                 }
 544                 else {
 545                         p_buf=privptr->p_read_active_first;
 546                         while (p_buf!=NULL) {
 547                                 free_pages((unsigned long)p_buf->p_buffer,
 548                                       (int)pages_to_order_of_mag(
 549                                         privptr->p_buff_pages_perread ));
 550                                 p_buf=p_buf->next;
 551                         }
 552                 }
 553                 if (privptr->p_env->write_size < PAGE_SIZE ) {
 554                         free_pages((unsigned long)privptr->p_buff_write,
 555                              (int)pages_to_order_of_mag(
 556                                 privptr->p_buff_write_num));
 557                 }
 558                 else {
 559                         p_buf=privptr->p_write_active_first;
 560                         while (p_buf!=NULL) {
 561                                 free_pages((unsigned long)p_buf->p_buffer,
 562                                      (int)pages_to_order_of_mag(
 563                                         privptr->p_buff_pages_perwrite ));
 564                                 p_buf=p_buf->next;
 565                         }
 566                 }
 567                 privptr->buffs_alloc = 0;
 568                 privptr->channel[READ].flag= 0x00;
 569                 privptr->channel[WRITE].flag = 0x00;
 570                 privptr->p_buff_ccw=NULL;
 571                 privptr->p_buff_read=NULL;
 572                 privptr->p_buff_write=NULL;
 573                 claw_clear_busy(dev);
 574                 CLAW_DBF_TEXT(2, trace, "open EIO");
 575                 return -EIO;
 576         }
 577
 578         /*   Send SystemValidate command */
 579
 580         claw_clear_busy(dev);
 581         CLAW_DBF_TEXT(4, trace, "openok");
 582         return 0;
 583 }    /*     end of claw_open    */
 584
 585 /*-------------------------------------------------------------------*
 586 *                                                                    *
 587 *       claw_irq_handler                                             *
 588 *                                                                    *
 589 *--------------------------------------------------------------------*/
 590 static void
 591 claw_irq_handler(struct ccw_device *cdev,
 592         unsigned long intparm, struct irb *irb)
 593 {
 594         struct chbk *p_ch = NULL;
 595         struct claw_privbk *privptr = NULL;
 596         struct net_device *dev = NULL;
 597         struct claw_env  *p_env;
 598         struct chbk *p_ch_r=NULL;
 599
 600         CLAW_DBF_TEXT(4, trace, "clawirq");
 601         /* Bypass all 'unsolicited interrupts' */
 602         privptr = dev_get_drvdata(&cdev->dev);
 603         if (!privptr) {
 604                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 605                         " IRQ, c-%02x d-%02x\n",
 606                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 607                 CLAW_DBF_TEXT(2, trace, "badirq");
 608                 return;
 609         }
 610
 611         /* Try to extract channel from driver data. */
 612         if (privptr->channel[READ].cdev == cdev)
 613                 p_ch = &privptr->channel[READ];
 614         else if (privptr->channel[WRITE].cdev == cdev)
 615                 p_ch = &privptr->channel[WRITE];
 616         else {
 617                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 618                 CLAW_DBF_TEXT(2, trace, "badchan");
 619                 return;
 620         }
 621         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 622
 623         dev = (struct net_device *) (p_ch->ndev);
 624         p_env=privptr->p_env;
 625
 626         /* Copy interruption response block. */
 627         memcpy(p_ch->irb, irb, sizeof(struct irb));
 628
 629         /* Check for good subchannel return code, otherwise info message */
 630         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 631                 dev_info(&cdev->dev,
 632                         "%s: subchannel check for device: %04x -"
 633                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 634                         dev->name, p_ch->devno,
 635                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 636                         irb->scsw.cmd.cpa);
 637                 CLAW_DBF_TEXT(2, trace, "chanchk");
 638                 /* return; */
 639         }
 640
 641         /* Check the reason-code of a unit check */
 642         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 643                 ccw_check_unit_check(p_ch, irb->ecw[0]);
 644
 645         /* State machine to bring the connection up, down and to restart */
 646         p_ch->last_dstat = irb->scsw.cmd.dstat;
 647
 648         switch (p_ch->claw_state) {
 649         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 650                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 651                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 652                 (p_ch->irb->scsw.cmd.stctl ==
 653                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 654                         return;
 655                 wake_up(&p_ch->wait);   /* wake up claw_release */
 656                 CLAW_DBF_TEXT(4, trace, "stop");
 657                 return;
 658         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 659                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 660                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 661                 (p_ch->irb->scsw.cmd.stctl ==
 662                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 663                         CLAW_DBF_TEXT(4, trace, "haltio");
 664                         return;
 665                 }
 666                 if (p_ch->flag == CLAW_READ) {
 667                         p_ch->claw_state = CLAW_START_READ;
 668                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 669                 } else if (p_ch->flag == CLAW_WRITE) {
 670                         p_ch->claw_state = CLAW_START_WRITE;
 671                         /*      send SYSTEM_VALIDATE                    */
 672                         claw_strt_read(dev, LOCK_NO);
 673                         claw_send_control(dev,
 674                                 SYSTEM_VALIDATE_REQUEST,
 675                                 0, 0, 0,
 676                                 p_env->host_name,
 677                                 p_env->adapter_name);
 678                 } else {
 679                         dev_warn(&cdev->dev, "The CLAW device received"
 680                                 " an unexpected IRQ, "
 681                                 "c-%02x d-%02x\n",
 682                                 irb->scsw.cmd.cstat,
 683                                 irb->scsw.cmd.dstat);
 684                         return;
 685                         }
 686                 CLAW_DBF_TEXT(4, trace, "haltio");
 687                 return;
 688         case CLAW_START_READ:
 689                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 690                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 691                         clear_bit(0, (void *)&p_ch->IO_active);
 692                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 693                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 694                             (p_ch->irb->ecw[0])        == 0) {
 695                                 privptr->stats.rx_errors++;
 696                                 dev_info(&cdev->dev,
 697                                         "%s: Restart is required after remote "
 698                                         "side recovers \n",
 699                                         dev->name);
 700                         }
 701                         CLAW_DBF_TEXT(4, trace, "notrdy");
 702                         return;
 703                 }
 704                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 705                         (p_ch->irb->scsw.cmd.dstat == 0)) {
 706                         if (test_and_set_bit(CLAW_BH_ACTIVE,
 707                                 (void *)&p_ch->flag_a) == 0)
 708                                 tasklet_schedule(&p_ch->tasklet);
 709                         else
 710                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
 711                         CLAW_DBF_TEXT(4, trace, "PCI_read");
 712                         return;
 713                 }
 714                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 715                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 716                  (p_ch->irb->scsw.cmd.stctl ==
 717                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 718                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
 719                         return;
 720                 }
 721                 clear_bit(0, (void *)&p_ch->IO_active);
 722                 claw_clearbit_busy(TB_RETRY, dev);
 723                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 724                         (void *)&p_ch->flag_a) == 0)
 725                         tasklet_schedule(&p_ch->tasklet);
 726                 else
 727                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
 728                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 729                 return;
 730         case CLAW_START_WRITE:
 731                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 732                         dev_info(&cdev->dev,
 733                                 "%s: Unit Check Occured in "
 734                                 "write channel\n", dev->name);
 735                         clear_bit(0, (void *)&p_ch->IO_active);
 736                         if (p_ch->irb->ecw[0] & 0x80) {
 737                                 dev_info(&cdev->dev,
 738                                         "%s: Resetting Event "
 739                                         "occurred:\n", dev->name);
 740                                 init_timer(&p_ch->timer);
 741                                 p_ch->timer.function =
 742                                         (void *)claw_write_retry;
 743                                 p_ch->timer.data = (unsigned long)p_ch;
 744                                 p_ch->timer.expires = jiffies + 10*HZ;
 745                                 add_timer(&p_ch->timer);
 746                                 dev_info(&cdev->dev,
 747                                         "%s: write connection "
 748                                         "restarting\n", dev->name);
 749                         }
 750                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 751                         return;
 752                 }
 753                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 754                         clear_bit(0, (void *)&p_ch->IO_active);
 755                         dev_info(&cdev->dev,
 756                                 "%s: Unit Exception "
 757                                 "occurred in write channel\n",
 758                                 dev->name);
 759                 }
 760                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 761                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 762                 (p_ch->irb->scsw.cmd.stctl ==
 763                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 764                         CLAW_DBF_TEXT(4, trace, "writeUE");
 765                         return;
 766                 }
 767                 clear_bit(0, (void *)&p_ch->IO_active);
 768                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 769                         claw_write_next(p_ch);
 770                         claw_clearbit_busy(TB_TX, dev);
 771                         claw_clear_busy(dev);
 772                 }
 773                 p_ch_r = (struct chbk *)&privptr->channel[READ];
 774                 if (test_and_set_bit(CLAW_BH_ACTIVE,
 775                         (void *)&p_ch_r->flag_a) == 0)
 776                         tasklet_schedule(&p_ch_r->tasklet);
 777                 CLAW_DBF_TEXT(4, trace, "StWtExit");
 778                 return;
 779         default:
 780                 dev_warn(&cdev->dev,
 781                         "The CLAW device for %s received an unexpected IRQ\n",
 782                          dev->name);
 783                 CLAW_DBF_TEXT(2, trace, "badIRQ");
 784                 return;
 785         }
 786
 787 }       /*   end of claw_irq_handler    */
 788
 789
 790 /*-------------------------------------------------------------------*
 791 *       claw_irq_tasklet                                             *
 792 *                                                                    *
 793 *--------------------------------------------------------------------*/
 794 static void
 795 claw_irq_tasklet ( unsigned long data )
 796 {
 797         struct chbk * p_ch;
 798         struct net_device  *dev;
 799         struct claw_privbk *       privptr;
 800
 801         p_ch = (struct chbk *) data;
 802         dev = (struct net_device *)p_ch->ndev;
 803         CLAW_DBF_TEXT(4, trace, "IRQtask");
 804         privptr = (struct claw_privbk *)dev->ml_priv;
 805         unpack_read(dev);
 806         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 807         CLAW_DBF_TEXT(4, trace, "TskletXt");
 808         return;
 809 }       /*    end of claw_irq_bh    */
 810
 811 /*-------------------------------------------------------------------*
 812 *       claw_release                                                 *
 813 *                                                                    *
 814 *--------------------------------------------------------------------*/
 815 static int
 816 claw_release(struct net_device *dev)
 817 {
 818         int                rc;
 819         int                i;
 820         unsigned long      saveflags;
 821         unsigned long      parm;
 822         struct claw_privbk *privptr;
 823         DECLARE_WAITQUEUE(wait, current);
 824         struct ccwbk*             p_this_ccw;
 825         struct ccwbk*             p_buf;
 826
 827         if (!dev)
 828                 return 0;
 829         privptr = (struct claw_privbk *)dev->ml_priv;
 830         if (!privptr)
 831                 return 0;
 832         CLAW_DBF_TEXT(4, trace, "release");
 833         privptr->release_pend=1;
 834         claw_setbit_busy(TB_STOP,dev);
 835         for ( i = 1; i >=0 ;  i--) {
 836                 spin_lock_irqsave(
 837                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 838              /*   del_timer(&privptr->channel[READ].timer);  */
 839                 privptr->channel[i].claw_state = CLAW_STOP;
 840                 privptr->channel[i].IO_active = 0;
 841                 parm = (unsigned long) &privptr->channel[i];
 842                 if (i == WRITE)
 843                         claw_purge_skb_queue(
 844                                 &privptr->channel[WRITE].collect_queue);
 845                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 846                 if (privptr->system_validate_comp==0x00)  /* never opened? */
 847                    init_waitqueue_head(&privptr->channel[i].wait);
 848                 add_wait_queue(&privptr->channel[i].wait, &wait);
 849                 set_current_state(TASK_INTERRUPTIBLE);
 850                 spin_unlock_irqrestore(
 851                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 852                 schedule();
 853                 set_current_state(TASK_RUNNING);
 854                 remove_wait_queue(&privptr->channel[i].wait, &wait);
 855                 if (rc != 0) {
 856                         ccw_check_return_code(privptr->channel[i].cdev, rc);
 857                 }
 858         }
 859         if (privptr->pk_skb != NULL) {
 860                 dev_kfree_skb_any(privptr->pk_skb);
 861                 privptr->pk_skb = NULL;
 862         }
 863         if(privptr->buffs_alloc != 1) {
 864                 CLAW_DBF_TEXT(4, trace, "none2fre");
 865                 return 0;
 866         }
 867         CLAW_DBF_TEXT(4, trace, "freebufs");
 868         if (privptr->p_buff_ccw != NULL) {
 869                 free_pages((unsigned long)privptr->p_buff_ccw,
 870                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 871         }
 872         CLAW_DBF_TEXT(4, trace, "freeread");
 873         if (privptr->p_env->read_size < PAGE_SIZE) {
 874             if (privptr->p_buff_read != NULL) {
 875                 free_pages((unsigned long)privptr->p_buff_read,
 876                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 877                 }
 878         }
 879         else {
 880                 p_buf=privptr->p_read_active_first;
 881                 while (p_buf!=NULL) {
 882                         free_pages((unsigned long)p_buf->p_buffer,
 883                              (int)pages_to_order_of_mag(
 884                                 privptr->p_buff_pages_perread ));
 885                         p_buf=p_buf->next;
 886                 }
 887         }
 888          CLAW_DBF_TEXT(4, trace, "freewrit");
 889         if (privptr->p_env->write_size < PAGE_SIZE ) {
 890                 free_pages((unsigned long)privptr->p_buff_write,
 891                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 892         }
 893         else {
 894                 p_buf=privptr->p_write_active_first;
 895                 while (p_buf!=NULL) {
 896                         free_pages((unsigned long)p_buf->p_buffer,
 897                               (int)pages_to_order_of_mag(
 898                               privptr->p_buff_pages_perwrite ));
 899                         p_buf=p_buf->next;
 900                 }
 901         }
 902          CLAW_DBF_TEXT(4, trace, "clearptr");
 903         privptr->buffs_alloc = 0;
 904         privptr->p_buff_ccw=NULL;
 905         privptr->p_buff_read=NULL;
 906         privptr->p_buff_write=NULL;
 907         privptr->system_validate_comp=0;
 908         privptr->release_pend=0;
 909         /*      Remove any writes that were pending and reset all reads   */
 910         p_this_ccw=privptr->p_read_active_first;
 911         while (p_this_ccw!=NULL) {
 912                 p_this_ccw->header.length=0xffff;
 913                 p_this_ccw->header.opcode=0xff;
 914                 p_this_ccw->header.flag=0x00;
 915                 p_this_ccw=p_this_ccw->next;
 916         }
 917
 918         while (privptr->p_write_active_first!=NULL) {
 919                 p_this_ccw=privptr->p_write_active_first;
 920                 p_this_ccw->header.flag=CLAW_PENDING;
 921                 privptr->p_write_active_first=p_this_ccw->next;
 922                 p_this_ccw->next=privptr->p_write_free_chain;
 923                 privptr->p_write_free_chain=p_this_ccw;
 924                 ++privptr->write_free_count;
 925         }
 926         privptr->p_write_active_last=NULL;
 927         privptr->mtc_logical_link = -1;
 928         privptr->mtc_skipping = 1;
 929         privptr->mtc_offset=0;
 930
 931         if (((privptr->channel[READ].last_dstat |
 932                 privptr->channel[WRITE].last_dstat) &
 933                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 934                 dev_warn(&privptr->channel[READ].cdev->dev,
 935                         "Deactivating %s completed with incorrect"
 936                         " subchannel status "
 937                         "(read %02x, write %02x)\n",
 938                 dev->name,
 939                 privptr->channel[READ].last_dstat,
 940                 privptr->channel[WRITE].last_dstat);
 941                  CLAW_DBF_TEXT(2, trace, "badclose");
 942         }
 943         CLAW_DBF_TEXT(4, trace, "rlsexit");
 944         return 0;
 945 }      /* end of claw_release     */
 946
 947 /*-------------------------------------------------------------------*
 948 *       claw_write_retry                                             *
 949 *                                                                    *
 950 *--------------------------------------------------------------------*/
 951
 952 static void
 953 claw_write_retry ( struct chbk *p_ch )
 954 {
 955
 956         struct net_device  *dev=p_ch->ndev;
 957
 958         CLAW_DBF_TEXT(4, trace, "w_retry");
 959         if (p_ch->claw_state == CLAW_STOP) {
 960                 return;
 961         }
 962         claw_strt_out_IO( dev );
 963         CLAW_DBF_TEXT(4, trace, "rtry_xit");
 964         return;
 965 }      /* end of claw_write_retry      */
 966
 967
 968 /*-------------------------------------------------------------------*
 969 *       claw_write_next                                              *
 970 *                                                                    *
 971 *--------------------------------------------------------------------*/
 972
 973 static void
 974 claw_write_next ( struct chbk * p_ch )
 975 {
 976
 977         struct net_device  *dev;
 978         struct claw_privbk *privptr=NULL;
 979         struct sk_buff *pk_skb;
 980         int     rc;
 981
 982         CLAW_DBF_TEXT(4, trace, "claw_wrt");
 983         if (p_ch->claw_state == CLAW_STOP)
 984                 return;
 985         dev = (struct net_device *) p_ch->ndev;
 986         privptr = (struct claw_privbk *) dev->ml_priv;
 987         claw_free_wrt_buf( dev );
 988         if ((privptr->write_free_count > 0) &&
 989             !skb_queue_empty(&p_ch->collect_queue)) {
 990                 pk_skb = claw_pack_skb(privptr);
 991                 while (pk_skb != NULL) {
 992                         rc = claw_hw_tx( pk_skb, dev,1);
 993                         if (privptr->write_free_count > 0) {
 994                                 pk_skb = claw_pack_skb(privptr);
 995                         } else
 996                                 pk_skb = NULL;
 997                 }
 998         }
 999         if (privptr->p_write_active_first!=NULL) {
1000                 claw_strt_out_IO(dev);
1001         }
1002         return;
1003 }      /* end of claw_write_next      */
1004
1005 /*-------------------------------------------------------------------*
1006 *                                                                    *
1007 *       claw_timer                                                   *
1008 *--------------------------------------------------------------------*/
1009
1010 static void
1011 claw_timer ( struct chbk * p_ch )
1012 {
1013         CLAW_DBF_TEXT(4, trace, "timer");
1014         p_ch->flag |= CLAW_TIMER;
1015         wake_up(&p_ch->wait);
1016         return;
1017 }      /* end of claw_timer  */
1018
1019 /*
1020 *
1021 *       functions
1022 */
1023
1024
1025 /*-------------------------------------------------------------------*
1026 *                                                                    *
1027 *     pages_to_order_of_mag                                          *
1028 *                                                                    *
1029 *    takes a number of pages from 1 to 512 and returns the           *
1030 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1031 *    of magnitude get_free_pages() has an upper order of 9           *
1032 *--------------------------------------------------------------------*/
1033
1034 static int
1035 pages_to_order_of_mag(int num_of_pages)
1036 {
1037         int     order_of_mag=1;         /* assume 2 pages */
1038         int     nump;
1039
1040         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1041         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1042         /* 512 pages = 2Meg on 4k page systems */
1043         if (num_of_pages >= 512) {return 9; }
1044         /* we have two or more pages order is at least 1 */
1045         for (nump=2 ;nump <= 512;nump*=2) {
1046           if (num_of_pages <= nump)
1047                   break;
1048           order_of_mag +=1;
1049         }
1050         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1051         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1052         return order_of_mag;
1053 }
1054
1055 /*-------------------------------------------------------------------*
1056 *                                                                    *
1057 *     add_claw_reads                                                 *
1058 *                                                                    *
1059 *--------------------------------------------------------------------*/
1060 static int
1061 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1062         struct ccwbk* p_last)
1063 {
1064         struct claw_privbk *privptr;
1065         struct ccw1  temp_ccw;
1066         struct endccw * p_end;
1067         CLAW_DBF_TEXT(4, trace, "addreads");
1068         privptr = dev->ml_priv;
1069         p_end = privptr->p_end_ccw;
1070
1071         /* first CCW and last CCW contains a new set of read channel programs
1072         *       to apend the running channel programs
1073         */
1074         if ( p_first==NULL) {
1075                 CLAW_DBF_TEXT(4, trace, "addexit");
1076                 return 0;
1077         }
1078
1079         /* set up ending CCW sequence for this segment */
1080         if (p_end->read1) {
1081                 p_end->read1=0x00;    /*  second ending CCW is now active */
1082                 /*      reset ending CCWs and setup TIC CCWs              */
1083                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1084                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1085                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1086                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1087                 p_end->read2_nop2.cda=0;
1088                 p_end->read2_nop2.count=1;
1089         }
1090         else {
1091                 p_end->read1=0x01;  /* first ending CCW is now active */
1092                 /*      reset ending CCWs and setup TIC CCWs          */
1093                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1094                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1095                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1096                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1097                 p_end->read1_nop2.cda=0;
1098                 p_end->read1_nop2.count=1;
1099         }
1100
1101         if ( privptr-> p_read_active_first ==NULL ) {
1102                 privptr->p_read_active_first = p_first;  /*  set new first */
1103                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1104         }
1105         else {
1106
1107                 /* set up TIC ccw  */
1108                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1109                 temp_ccw.count=0;
1110                 temp_ccw.flags=0;
1111                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1112
1113
1114                 if (p_end->read1) {
1115
1116                /* first set of CCW's is chained to the new read              */
1117                /* chain, so the second set is chained to the active chain.   */
1118                /* Therefore modify the second set to point to the new        */
1119                /* read chain set up TIC CCWs                                 */
1120                /* make sure we update the CCW so channel doesn't fetch it    */
1121                /* when it's only half done                                   */
1122                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1123                                 sizeof(struct ccw1));
1124                         privptr->p_read_active_last->r_TIC_1.cda=
1125                                 (__u32)__pa(&p_first->read);
1126                         privptr->p_read_active_last->r_TIC_2.cda=
1127                                 (__u32)__pa(&p_first->read);
1128                 }
1129                 else {
1130                         /* make sure we update the CCW so channel doesn't   */
1131                         /* fetch it when it is only half done               */
1132                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1133                                 sizeof(struct ccw1));
1134                         privptr->p_read_active_last->r_TIC_1.cda=
1135                                 (__u32)__pa(&p_first->read);
1136                         privptr->p_read_active_last->r_TIC_2.cda=
1137                                 (__u32)__pa(&p_first->read);
1138                 }
1139                 /*      chain in new set of blocks                         */
1140                 privptr->p_read_active_last->next = p_first;
1141                 privptr->p_read_active_last=p_last;
1142         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1143         CLAW_DBF_TEXT(4, trace, "addexit");
1144         return 0;
1145 }    /*     end of add_claw_reads   */
1146
1147 /*-------------------------------------------------------------------*
1148  *   ccw_check_return_code                                           *
1149  *                                                                   *
1150  *-------------------------------------------------------------------*/
1151
1152 static void
1153 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1154 {
1155         CLAW_DBF_TEXT(4, trace, "ccwret");
1156         if (return_code != 0) {
1157                 switch (return_code) {
1158                 case -EBUSY: /* BUSY is a transient state no action needed */
1159                         break;
1160                 case -ENODEV:
1161                         dev_err(&cdev->dev, "The remote channel adapter is not"
1162                                 " available\n");
1163                         break;
1164                 case -EINVAL:
1165                         dev_err(&cdev->dev,
1166                                 "The status of the remote channel adapter"
1167                                 " is not valid\n");
1168                         break;
1169                 default:
1170                         dev_err(&cdev->dev, "The common device layer"
1171                                 " returned error code %d\n",
1172                                   return_code);
1173                 }
1174         }
1175         CLAW_DBF_TEXT(4, trace, "ccwret");
1176 }    /*    end of ccw_check_return_code   */
1177
1178 /*-------------------------------------------------------------------*
1179 *       ccw_check_unit_check                                         *
1180 *--------------------------------------------------------------------*/
1181
1182 static void
1183 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1184 {
1185         struct net_device *ndev = p_ch->ndev;
1186         struct device *dev = &p_ch->cdev->dev;
1187
1188         CLAW_DBF_TEXT(4, trace, "unitchek");
1189         dev_warn(dev, "The communication peer of %s disconnected\n",
1190                 ndev->name);
1191
1192         if (sense & 0x40) {
1193                 if (sense & 0x01) {
1194                         dev_warn(dev, "The remote channel adapter for"
1195                                 " %s has been reset\n",
1196                                 ndev->name);
1197                 }
1198         } else if (sense & 0x20) {
1199                 if (sense & 0x04) {
1200                         dev_warn(dev, "A data streaming timeout occurred"
1201                                 " for %s\n",
1202                                 ndev->name);
1203                 } else if (sense & 0x10) {
1204                         dev_warn(dev, "The remote channel adapter for %s"
1205                                 " is faulty\n",
1206                                 ndev->name);
1207                 } else {
1208                         dev_warn(dev, "A data transfer parity error occurred"
1209                                 " for %s\n",
1210                                 ndev->name);
1211                 }
1212         } else if (sense & 0x10) {
1213                 dev_warn(dev, "A read data parity error occurred"
1214                         " for %s\n",
1215                         ndev->name);
1216         }
1217
1218 }   /*    end of ccw_check_unit_check    */
1219
1220 /*-------------------------------------------------------------------*
1221 *               find_link                                            *
1222 *--------------------------------------------------------------------*/
1223 static int
1224 find_link(struct net_device *dev, char *host_name, char *ws_name )
1225 {
1226         struct claw_privbk *privptr;
1227         struct claw_env *p_env;
1228         int    rc=0;
1229
1230         CLAW_DBF_TEXT(2, setup, "findlink");
1231         privptr = dev->ml_priv;
1232         p_env=privptr->p_env;
1233         switch (p_env->packing)
1234         {
1235                 case  PACKING_ASK:
1236                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1237                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1238                              rc = EINVAL;
1239                         break;
1240                 case  DO_PACKED:
1241                 case  PACK_SEND:
1242                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1243                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1244                                 rc = EINVAL;
1245                         break;
1246                 default:
1247                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1248                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1249                                 rc = EINVAL;
1250                         break;
1251         }
1252
1253         return rc;
1254 }    /*    end of find_link    */
1255
1256 /*-------------------------------------------------------------------*
1257  *   claw_hw_tx                                                      *
1258  *                                                                   *
1259  *                                                                   *
1260  *-------------------------------------------------------------------*/
1261
1262 static int
1263 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1264 {
1265         int                             rc=0;
1266         struct claw_privbk              *privptr;
1267         struct ccwbk           *p_this_ccw;
1268         struct ccwbk           *p_first_ccw;
1269         struct ccwbk           *p_last_ccw;
1270         __u32                           numBuffers;
1271         signed long                     len_of_data;
1272         unsigned long                   bytesInThisBuffer;
1273         unsigned char                   *pDataAddress;
1274         struct endccw                   *pEnd;
1275         struct ccw1                     tempCCW;
1276         struct chbk                     *p_ch;
1277         struct claw_env                 *p_env;
1278         int                             lock;
1279         struct clawph                   *pk_head;
1280         struct chbk                     *ch;
1281
1282         CLAW_DBF_TEXT(4, trace, "hw_tx");
1283         privptr = (struct claw_privbk *)(dev->ml_priv);
1284         p_ch=(struct chbk *)&privptr->channel[WRITE];
1285         p_env =privptr->p_env;
1286         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1287         /*  scan the write queue to free any completed write packets   */
1288         p_first_ccw=NULL;
1289         p_last_ccw=NULL;
1290         if ((p_env->packing >= PACK_SEND) &&
1291             (skb->cb[1] != 'P')) {
1292                 skb_push(skb,sizeof(struct clawph));
1293                 pk_head=(struct clawph *)skb->data;
1294                 pk_head->len=skb->len-sizeof(struct clawph);
1295                 if (pk_head->len%4)  {
1296                         pk_head->len+= 4-(pk_head->len%4);
1297                         skb_pad(skb,4-(pk_head->len%4));
1298                         skb_put(skb,4-(pk_head->len%4));
1299                 }
1300                 if (p_env->packing == DO_PACKED)
1301                         pk_head->link_num = linkid;
1302                 else
1303                         pk_head->link_num = 0;
1304                 pk_head->flag = 0x00;
1305                 skb_pad(skb,4);
1306                 skb->cb[1] = 'P';
1307         }
1308         if (linkid == 0) {
1309                 if (claw_check_busy(dev)) {
1310                         if (privptr->write_free_count!=0) {
1311                                 claw_clear_busy(dev);
1312                         }
1313                         else {
1314                                 claw_strt_out_IO(dev );
1315                                 claw_free_wrt_buf( dev );
1316                                 if (privptr->write_free_count==0) {
1317                                         ch = &privptr->channel[WRITE];
1318                                         atomic_inc(&skb->users);
1319                                         skb_queue_tail(&ch->collect_queue, skb);
1320                                         goto Done;
1321                                 }
1322                                 else {
1323                                         claw_clear_busy(dev);
1324                                 }
1325                         }
1326                 }
1327                 /*  tx lock  */
1328                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1329                         ch = &privptr->channel[WRITE];
1330                         atomic_inc(&skb->users);
1331                         skb_queue_tail(&ch->collect_queue, skb);
1332                         claw_strt_out_IO(dev );
1333                         rc=-EBUSY;
1334                         goto Done2;
1335                 }
1336         }
1337         /*      See how many write buffers are required to hold this data */
1338         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1339
1340         /*      If that number of buffers isn't available, give up for now */
1341         if (privptr->write_free_count < numBuffers ||
1342             privptr->p_write_free_chain == NULL ) {
1343
1344                 claw_setbit_busy(TB_NOBUFFER,dev);
1345                 ch = &privptr->channel[WRITE];
1346                 atomic_inc(&skb->users);
1347                 skb_queue_tail(&ch->collect_queue, skb);
1348                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1349                 goto Done2;
1350         }
1351         pDataAddress=skb->data;
1352         len_of_data=skb->len;
1353
1354         while (len_of_data > 0) {
1355                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1356                 if (p_this_ccw == NULL) { /* lost the race */
1357                         ch = &privptr->channel[WRITE];
1358                         atomic_inc(&skb->users);
1359                         skb_queue_tail(&ch->collect_queue, skb);
1360                         goto Done2;
1361                 }
1362                 privptr->p_write_free_chain=p_this_ccw->next;
1363                 p_this_ccw->next=NULL;
1364                 --privptr->write_free_count; /* -1 */
1365                 if (len_of_data >= privptr->p_env->write_size)
1366                         bytesInThisBuffer = privptr->p_env->write_size;
1367                 else
1368                         bytesInThisBuffer = len_of_data;
1369                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1370                 len_of_data-=bytesInThisBuffer;
1371                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1372                 /*      setup write CCW         */
1373                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1374                 if (len_of_data>0) {
1375                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1376                 }
1377                 p_this_ccw->write.count=bytesInThisBuffer;
1378                 /*      now add to end of this chain    */
1379                 if (p_first_ccw==NULL)    {
1380                         p_first_ccw=p_this_ccw;
1381                 }
1382                 if (p_last_ccw!=NULL) {
1383                         p_last_ccw->next=p_this_ccw;
1384                         /*      set up TIC ccws         */
1385                         p_last_ccw->w_TIC_1.cda=
1386                                 (__u32)__pa(&p_this_ccw->write);
1387                 }
1388                 p_last_ccw=p_this_ccw;      /* save new last block */
1389         }
1390
1391         /*      FirstCCW and LastCCW now contain a new set of write channel
1392         *       programs to append to the running channel program
1393         */
1394
1395         if (p_first_ccw!=NULL) {
1396                 /*      setup ending ccw sequence for this segment           */
1397                 pEnd=privptr->p_end_ccw;
1398                 if (pEnd->write1) {
1399                         pEnd->write1=0x00;   /* second end ccw is now active */
1400                         /*      set up Tic CCWs         */
1401                         p_last_ccw->w_TIC_1.cda=
1402                                 (__u32)__pa(&pEnd->write2_nop1);
1403                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1404                         pEnd->write2_nop2.flags    =
1405                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1406                         pEnd->write2_nop2.cda=0;
1407                         pEnd->write2_nop2.count=1;
1408                 }
1409                 else {  /*  end of if (pEnd->write1)*/
1410                         pEnd->write1=0x01;   /* first end ccw is now active */
1411                         /*      set up Tic CCWs         */
1412                         p_last_ccw->w_TIC_1.cda=
1413                                 (__u32)__pa(&pEnd->write1_nop1);
1414                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1415                         pEnd->write1_nop2.flags    =
1416                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1417                         pEnd->write1_nop2.cda=0;
1418                         pEnd->write1_nop2.count=1;
1419                 }  /* end if if (pEnd->write1) */
1420
1421                 if (privptr->p_write_active_first==NULL ) {
1422                         privptr->p_write_active_first=p_first_ccw;
1423                         privptr->p_write_active_last=p_last_ccw;
1424                 }
1425                 else {
1426                         /*      set up Tic CCWs         */
1427
1428                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1429                         tempCCW.count=0;
1430                         tempCCW.flags=0;
1431                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1432
1433                         if (pEnd->write1) {
1434
1435                  /*
1436                  * first set of ending CCW's is chained to the new write
1437                  * chain, so the second set is chained to the active chain
1438                  * Therefore modify the second set to point the new write chain.
1439                  * make sure we update the CCW atomically
1440                  * so channel does not fetch it when it's only half done
1441                  */
1442                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1443                                         sizeof(struct ccw1));
1444                                 privptr->p_write_active_last->w_TIC_1.cda=
1445                                         (__u32)__pa(&p_first_ccw->write);
1446                         }
1447                         else {
1448
1449                         /*make sure we update the CCW atomically
1450                          *so channel does not fetch it when it's only half done
1451                          */
1452                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1453                                         sizeof(struct ccw1));
1454                                 privptr->p_write_active_last->w_TIC_1.cda=
1455                                         (__u32)__pa(&p_first_ccw->write);
1456
1457                         } /* end if if (pEnd->write1) */
1458
1459                         privptr->p_write_active_last->next=p_first_ccw;
1460                         privptr->p_write_active_last=p_last_ccw;
1461                 }
1462
1463         } /* endif (p_first_ccw!=NULL)  */
1464         dev_kfree_skb_any(skb);
1465         if (linkid==0) {
1466                 lock=LOCK_NO;
1467         }
1468         else  {
1469                 lock=LOCK_YES;
1470         }
1471         claw_strt_out_IO(dev );
1472         /*      if write free count is zero , set NOBUFFER       */
1473         if (privptr->write_free_count==0) {
1474                 claw_setbit_busy(TB_NOBUFFER,dev);
1475         }
1476 Done2:
1477         claw_clearbit_busy(TB_TX,dev);
1478 Done:
1479         return(rc);
1480 }    /*    end of claw_hw_tx    */
1481
1482 /*-------------------------------------------------------------------*
1483 *                                                                    *
1484 *     init_ccw_bk                                                    *
1485 *                                                                    *
1486 *--------------------------------------------------------------------*/
1487
1488 static int
1489 init_ccw_bk(struct net_device *dev)
1490 {
1491
1492         __u32   ccw_blocks_required;
1493         __u32   ccw_blocks_perpage;
1494         __u32   ccw_pages_required;
1495         __u32   claw_reads_perpage=1;
1496         __u32   claw_read_pages;
1497         __u32   claw_writes_perpage=1;
1498         __u32   claw_write_pages;
1499         void    *p_buff=NULL;
1500         struct ccwbk*p_free_chain;
1501         struct ccwbk*p_buf;
1502         struct ccwbk*p_last_CCWB;
1503         struct ccwbk*p_first_CCWB;
1504         struct endccw *p_endccw=NULL;
1505         addr_t  real_address;
1506         struct claw_privbk *privptr = dev->ml_priv;
1507         struct clawh *pClawH=NULL;
1508         addr_t   real_TIC_address;
1509         int i,j;
1510         CLAW_DBF_TEXT(4, trace, "init_ccw");
1511
1512         /*  initialize  statistics field */
1513         privptr->active_link_ID=0;
1514         /*  initialize  ccwbk pointers  */
1515         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1516         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1517         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1518         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1519         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1520         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1521         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1522         privptr->buffs_alloc = 0;
1523         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1524         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1525         /*  initialize  free write ccwbk counter  */
1526         privptr->write_free_count=0;  /* number of free bufs on write chain */
1527         p_last_CCWB = NULL;
1528         p_first_CCWB= NULL;
1529         /*
1530         *  We need 1 CCW block for each read buffer, 1 for each
1531         *  write buffer, plus 1 for ClawSignalBlock
1532         */
1533         ccw_blocks_required =
1534                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1535         /*
1536         * compute number of CCW blocks that will fit in a page
1537         */
1538         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1539         ccw_pages_required=
1540                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1541
1542         /*
1543          *  read and write sizes are set by 2 constants in claw.h
1544          *  4k and 32k.  Unpacked values other than 4k are not going to
1545          * provide good performance. With packing buffers support 32k
1546          * buffers are used.
1547          */
1548         if (privptr->p_env->read_size < PAGE_SIZE) {
1549                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1550                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1551                                                 claw_reads_perpage);
1552          }
1553          else {       /* > or equal  */
1554                 privptr->p_buff_pages_perread =
1555                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1556                 claw_read_pages = privptr->p_env->read_buffers *
1557                                         privptr->p_buff_pages_perread;
1558          }
1559         if (privptr->p_env->write_size < PAGE_SIZE) {
1560                 claw_writes_perpage =
1561                         PAGE_SIZE / privptr->p_env->write_size;
1562                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1563                                                 claw_writes_perpage);
1564
1565         }
1566         else {      /* >  or equal  */
1567                 privptr->p_buff_pages_perwrite =
1568                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1569                 claw_write_pages = privptr->p_env->write_buffers *
1570                                         privptr->p_buff_pages_perwrite;
1571         }
1572         /*
1573         *               allocate ccw_pages_required
1574         */
1575         if (privptr->p_buff_ccw==NULL) {
1576                 privptr->p_buff_ccw=
1577                         (void *)__get_free_pages(__GFP_DMA,
1578                         (int)pages_to_order_of_mag(ccw_pages_required ));
1579                 if (privptr->p_buff_ccw==NULL) {
1580                         return -ENOMEM;
1581                 }
1582                 privptr->p_buff_ccw_num=ccw_pages_required;
1583         }
1584         memset(privptr->p_buff_ccw, 0x00,
1585                 privptr->p_buff_ccw_num * PAGE_SIZE);
1586
1587         /*
1588         *               obtain ending ccw block address
1589         *
1590         */
1591         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1592         real_address  = (__u32)__pa(privptr->p_end_ccw);
1593         /*                              Initialize ending CCW block       */
1594         p_endccw=privptr->p_end_ccw;
1595         p_endccw->real=real_address;
1596         p_endccw->write1=0x00;
1597         p_endccw->read1=0x00;
1598
1599         /*      write1_nop1                                     */
1600         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1601         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1602         p_endccw->write1_nop1.count       = 1;
1603         p_endccw->write1_nop1.cda         = 0;
1604
1605         /*      write1_nop2                                     */
1606         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1607         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1608         p_endccw->write1_nop2.count      = 1;
1609         p_endccw->write1_nop2.cda        = 0;
1610
1611         /*      write2_nop1                                     */
1612         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1613         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1614         p_endccw->write2_nop1.count        = 1;
1615         p_endccw->write2_nop1.cda          = 0;
1616
1617         /*      write2_nop2                                     */
1618         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1619         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1620         p_endccw->write2_nop2.count        = 1;
1621         p_endccw->write2_nop2.cda          = 0;
1622
1623         /*      read1_nop1                                      */
1624         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1625         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1626         p_endccw->read1_nop1.count        = 1;
1627         p_endccw->read1_nop1.cda          = 0;
1628
1629         /*      read1_nop2                                      */
1630         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1631         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1632         p_endccw->read1_nop2.count        = 1;
1633         p_endccw->read1_nop2.cda          = 0;
1634
1635         /*      read2_nop1                                      */
1636         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1637         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1638         p_endccw->read2_nop1.count        = 1;
1639         p_endccw->read2_nop1.cda          = 0;
1640
1641         /*      read2_nop2                                      */
1642         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1643         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1644         p_endccw->read2_nop2.count        = 1;
1645         p_endccw->read2_nop2.cda          = 0;
1646
1647         /*
1648         *                               Build a chain of CCWs
1649         *
1650         */
1651         p_buff=privptr->p_buff_ccw;
1652
1653         p_free_chain=NULL;
1654         for (i=0 ; i < ccw_pages_required; i++ ) {
1655                 real_address  = (__u32)__pa(p_buff);
1656                 p_buf=p_buff;
1657                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1658                         p_buf->next  = p_free_chain;
1659                         p_free_chain = p_buf;
1660                         p_buf->real=(__u32)__pa(p_buf);
1661                         ++p_buf;
1662                 }
1663                 p_buff+=PAGE_SIZE;
1664         }
1665         /*
1666         *                               Initialize ClawSignalBlock
1667         *
1668         */
1669         if (privptr->p_claw_signal_blk==NULL) {
1670                 privptr->p_claw_signal_blk=p_free_chain;
1671                 p_free_chain=p_free_chain->next;
1672                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1673                 pClawH->length=0xffff;
1674                 pClawH->opcode=0xff;
1675                 pClawH->flag=CLAW_BUSY;
1676         }
1677
1678         /*
1679         *               allocate write_pages_required and add to free chain
1680         */
1681         if (privptr->p_buff_write==NULL) {
1682             if (privptr->p_env->write_size < PAGE_SIZE) {
1683                 privptr->p_buff_write=
1684                         (void *)__get_free_pages(__GFP_DMA,
1685                         (int)pages_to_order_of_mag(claw_write_pages ));
1686                 if (privptr->p_buff_write==NULL) {
1687                         privptr->p_buff_ccw=NULL;
1688                         return -ENOMEM;
1689                 }
1690                 /*
1691                 *                               Build CLAW write free chain
1692                 *
1693                 */
1694
1695                 memset(privptr->p_buff_write, 0x00,
1696                         ccw_pages_required * PAGE_SIZE);
1697                 privptr->p_write_free_chain=NULL;
1698
1699                 p_buff=privptr->p_buff_write;
1700
1701                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1702                         p_buf        = p_free_chain;      /*  get a CCW */
1703                         p_free_chain = p_buf->next;
1704                         p_buf->next  =privptr->p_write_free_chain;
1705                         privptr->p_write_free_chain = p_buf;
1706                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1707                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1708                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1709                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1710                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1711                         p_buf-> w_read_FF.count   = 1;
1712                         p_buf-> w_read_FF.cda     =
1713                                 (__u32)__pa(&p_buf-> header.flag);
1714                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1715                         p_buf-> w_TIC_1.flags      = 0;
1716                         p_buf-> w_TIC_1.count      = 0;
1717
1718                         if (((unsigned long)p_buff +
1719                                             privptr->p_env->write_size) >=
1720                            ((unsigned long)(p_buff+2*
1721                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1722                                 p_buff = p_buff+privptr->p_env->write_size;
1723                         }
1724                 }
1725            }
1726            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1727            {
1728                privptr->p_write_free_chain=NULL;
1729                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1730                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1731                         (int)pages_to_order_of_mag(
1732                         privptr->p_buff_pages_perwrite) );
1733                    if (p_buff==NULL) {
1734                         free_pages((unsigned long)privptr->p_buff_ccw,
1735                               (int)pages_to_order_of_mag(
1736                                         privptr->p_buff_ccw_num));
1737                         privptr->p_buff_ccw=NULL;
1738                         p_buf=privptr->p_buff_write;
1739                         while (p_buf!=NULL) {
1740                                 free_pages((unsigned long)
1741                                         p_buf->p_buffer,
1742                                         (int)pages_to_order_of_mag(
1743                                         privptr->p_buff_pages_perwrite));
1744                                 p_buf=p_buf->next;
1745                         }
1746                         return -ENOMEM;
1747                    }  /* Error on get_pages   */
1748                    memset(p_buff, 0x00, privptr->p_env->write_size );
1749                    p_buf         = p_free_chain;
1750                    p_free_chain  = p_buf->next;
1751                    p_buf->next   = privptr->p_write_free_chain;
1752                    privptr->p_write_free_chain = p_buf;
1753                    privptr->p_buff_write = p_buf;
1754                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1755                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1756                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1757                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1758                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1759                    p_buf-> w_read_FF.count    = 1;
1760                    p_buf-> w_read_FF.cda      =
1761                         (__u32)__pa(&p_buf-> header.flag);
1762                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1763                    p_buf-> w_TIC_1.flags   = 0;
1764                    p_buf-> w_TIC_1.count   = 0;
1765                }  /* for all write_buffers   */
1766
1767            }    /* else buffers are PAGE_SIZE or bigger */
1768
1769         }
1770         privptr->p_buff_write_num=claw_write_pages;
1771         privptr->write_free_count=privptr->p_env->write_buffers;
1772
1773
1774         /*
1775         *               allocate read_pages_required and chain to free chain
1776         */
1777         if (privptr->p_buff_read==NULL) {
1778             if (privptr->p_env->read_size < PAGE_SIZE)  {
1779                 privptr->p_buff_read=
1780                         (void *)__get_free_pages(__GFP_DMA,
1781                         (int)pages_to_order_of_mag(claw_read_pages) );
1782                 if (privptr->p_buff_read==NULL) {
1783                         free_pages((unsigned long)privptr->p_buff_ccw,
1784                                 (int)pages_to_order_of_mag(
1785                                         privptr->p_buff_ccw_num));
1786                         /* free the write pages size is < page size  */
1787                         free_pages((unsigned long)privptr->p_buff_write,
1788                                 (int)pages_to_order_of_mag(
1789                                 privptr->p_buff_write_num));
1790                         privptr->p_buff_ccw=NULL;
1791                         privptr->p_buff_write=NULL;
1792                         return -ENOMEM;
1793                 }
1794                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1795                 privptr->p_buff_read_num=claw_read_pages;
1796                 /*
1797                 *                               Build CLAW read free chain
1798                 *
1799                 */
1800                 p_buff=privptr->p_buff_read;
1801                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1802                         p_buf        = p_free_chain;
1803                         p_free_chain = p_buf->next;
1804
1805                         if (p_last_CCWB==NULL) {
1806                                 p_buf->next=NULL;
1807                                 real_TIC_address=0;
1808                                 p_last_CCWB=p_buf;
1809                         }
1810                         else {
1811                                 p_buf->next=p_first_CCWB;
1812                                 real_TIC_address=
1813                                 (__u32)__pa(&p_first_CCWB -> read );
1814                         }
1815
1816                         p_first_CCWB=p_buf;
1817
1818                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1819                         /*  initialize read command */
1820                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1821                         p_buf-> read.cda = (__u32)__pa(p_buff);
1822                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1823                         p_buf-> read.count       = privptr->p_env->read_size;
1824
1825                         /*  initialize read_h command */
1826                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1827                         p_buf-> read_h.cda =
1828                                 (__u32)__pa(&(p_buf->header));
1829                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1830                         p_buf-> read_h.count      = sizeof(struct clawh);
1831
1832                         /*  initialize Signal command */
1833                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1834                         p_buf-> signal.cda =
1835                                 (__u32)__pa(&(pClawH->flag));
1836                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1837                         p_buf-> signal.count     = 1;
1838
1839                         /*  initialize r_TIC_1 command */
1840                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1841                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1842                         p_buf-> r_TIC_1.flags = 0;
1843                         p_buf-> r_TIC_1.count      = 0;
1844
1845                         /*  initialize r_read_FF command */
1846                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1847                         p_buf-> r_read_FF.cda =
1848                                 (__u32)__pa(&(pClawH->flag));
1849                         p_buf-> r_read_FF.flags =
1850                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1851                         p_buf-> r_read_FF.count    = 1;
1852
1853                         /*    initialize r_TIC_2          */
1854                         memcpy(&p_buf->r_TIC_2,
1855                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1856
1857                         /*     initialize Header     */
1858                         p_buf->header.length=0xffff;
1859                         p_buf->header.opcode=0xff;
1860                         p_buf->header.flag=CLAW_PENDING;
1861
1862                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1863                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1864                                  -1)
1865                            & PAGE_MASK)) {
1866                                 p_buff= p_buff+privptr->p_env->read_size;
1867                         }
1868                         else {
1869                                 p_buff=
1870                                 (void *)((unsigned long)
1871                                         (p_buff+2*(privptr->p_env->read_size)-1)
1872                                          & PAGE_MASK) ;
1873                         }
1874                 }   /* for read_buffers   */
1875           }         /* read_size < PAGE_SIZE  */
1876           else {  /* read Size >= PAGE_SIZE  */
1877                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1878                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1879                                 (int)pages_to_order_of_mag(
1880                                         privptr->p_buff_pages_perread));
1881                         if (p_buff==NULL) {
1882                                 free_pages((unsigned long)privptr->p_buff_ccw,
1883                                         (int)pages_to_order_of_mag(privptr->
1884                                         p_buff_ccw_num));
1885                                 /* free the write pages  */
1886                                 p_buf=privptr->p_buff_write;
1887                                 while (p_buf!=NULL) {
1888                                         free_pages(
1889                                             (unsigned long)p_buf->p_buffer,
1890                                             (int)pages_to_order_of_mag(
1891                                             privptr->p_buff_pages_perwrite));
1892                                         p_buf=p_buf->next;
1893                                 }
1894                                 /* free any read pages already alloc  */
1895                                 p_buf=privptr->p_buff_read;
1896                                 while (p_buf!=NULL) {
1897                                         free_pages(
1898                                             (unsigned long)p_buf->p_buffer,
1899                                             (int)pages_to_order_of_mag(
1900                                              privptr->p_buff_pages_perread));
1901                                         p_buf=p_buf->next;
1902                                 }
1903                                 privptr->p_buff_ccw=NULL;
1904                                 privptr->p_buff_write=NULL;
1905                                 return -ENOMEM;
1906                         }
1907                         memset(p_buff, 0x00, privptr->p_env->read_size);
1908                         p_buf        = p_free_chain;
1909                         privptr->p_buff_read = p_buf;
1910                         p_free_chain = p_buf->next;
1911
1912                         if (p_last_CCWB==NULL) {
1913                                 p_buf->next=NULL;
1914                                 real_TIC_address=0;
1915                                 p_last_CCWB=p_buf;
1916                         }
1917                         else {
1918                                 p_buf->next=p_first_CCWB;
1919                                 real_TIC_address=
1920                                         (addr_t)__pa(
1921                                                 &p_first_CCWB -> read );
1922                         }
1923
1924                         p_first_CCWB=p_buf;
1925                                 /* save buff address */
1926                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1927                         /*  initialize read command */
1928                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1929                         p_buf-> read.cda = (__u32)__pa(p_buff);
1930                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1931                         p_buf-> read.count       = privptr->p_env->read_size;
1932
1933                         /*  initialize read_h command */
1934                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1935                         p_buf-> read_h.cda =
1936                                 (__u32)__pa(&(p_buf->header));
1937                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1938                         p_buf-> read_h.count      = sizeof(struct clawh);
1939
1940                         /*  initialize Signal command */
1941                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1942                         p_buf-> signal.cda =
1943                                 (__u32)__pa(&(pClawH->flag));
1944                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1945                         p_buf-> signal.count     = 1;
1946
1947                         /*  initialize r_TIC_1 command */
1948                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1949                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1950                         p_buf-> r_TIC_1.flags = 0;
1951                         p_buf-> r_TIC_1.count      = 0;
1952
1953                         /*  initialize r_read_FF command */
1954                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1955                         p_buf-> r_read_FF.cda =
1956                                 (__u32)__pa(&(pClawH->flag));
1957                         p_buf-> r_read_FF.flags =
1958                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1959                         p_buf-> r_read_FF.count    = 1;
1960
1961                         /*    initialize r_TIC_2          */
1962                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1963                                 sizeof(struct ccw1));
1964
1965                         /*     initialize Header     */
1966                         p_buf->header.length=0xffff;
1967                         p_buf->header.opcode=0xff;
1968                         p_buf->header.flag=CLAW_PENDING;
1969
1970                 }    /* For read_buffers   */
1971           }     /*  read_size >= PAGE_SIZE   */
1972         }       /*  pBuffread = NULL */
1973         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1974         privptr->buffs_alloc = 1;
1975
1976         return 0;
1977 }    /*    end of init_ccw_bk */
1978
1979 /*-------------------------------------------------------------------*
1980 *                                                                    *
1981 *       probe_error                                                  *
1982 *                                                                    *
1983 *--------------------------------------------------------------------*/
1984
1985 static void
1986 probe_error( struct ccwgroup_device *cgdev)
1987 {
1988         struct claw_privbk *privptr;
1989
1990         CLAW_DBF_TEXT(4, trace, "proberr");
1991         privptr = dev_get_drvdata(&cgdev->dev);
1992         if (privptr != NULL) {
1993                 dev_set_drvdata(&cgdev->dev, NULL);
1994                 kfree(privptr->p_env);
1995                 kfree(privptr->p_mtc_envelope);
1996                 kfree(privptr);
1997         }
1998 }    /*    probe_error    */
1999
2000 /*-------------------------------------------------------------------*
2001 *    claw_process_control                                            *
2002 *                                                                    *
2003 *                                                                    *
2004 *--------------------------------------------------------------------*/
2005
2006 static int
2007 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
2008 {
2009
2010         struct clawbuf *p_buf;
2011         struct clawctl  ctlbk;
2012         struct clawctl *p_ctlbk;
2013         char    temp_host_name[8];
2014         char    temp_ws_name[8];
2015         struct claw_privbk *privptr;
2016         struct claw_env *p_env;
2017         struct sysval *p_sysval;
2018         struct conncmd *p_connect=NULL;
2019         int rc;
2020         struct chbk *p_ch = NULL;
2021         struct device *tdev;
2022         CLAW_DBF_TEXT(2, setup, "clw_cntl");
2023         udelay(1000);  /* Wait a ms for the control packets to
2024                         *catch up to each other */
2025         privptr = dev->ml_priv;
2026         p_env=privptr->p_env;
2027         tdev = &privptr->channel[READ].cdev->dev;
2028         memcpy( &temp_host_name, p_env->host_name, 8);
2029         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2030         dev_info(tdev, "%s: CLAW device %.8s: "
2031                 "Received Control Packet\n",
2032                 dev->name, temp_ws_name);
2033         if (privptr->release_pend==1) {
2034                 return 0;
2035         }
2036         p_buf=p_ccw->p_buffer;
2037         p_ctlbk=&ctlbk;
2038         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2039                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2040         } else {
2041                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2042         }
2043         switch (p_ctlbk->command)
2044         {
2045         case SYSTEM_VALIDATE_REQUEST:
2046                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2047                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2048                                 CLAW_RC_WRONG_VERSION);
2049                         dev_warn(tdev, "The communication peer of %s"
2050                                 " uses an incorrect API version %d\n",
2051                                 dev->name, p_ctlbk->version);
2052                 }
2053                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2054                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2055                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2056                         "Host name=%.8s\n",
2057                         dev->name, p_ctlbk->version,
2058                         p_ctlbk->linkid,
2059                         p_ctlbk->correlator,
2060                         p_sysval->WS_name,
2061                         p_sysval->host_name);
2062                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2063                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2064                                 CLAW_RC_NAME_MISMATCH);
2065                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2066                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2067                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2068                         dev_warn(tdev,
2069                                 "Host name %s for %s does not match the"
2070                                 " remote adapter name %s\n",
2071                                 p_sysval->host_name,
2072                                 dev->name,
2073                                 temp_host_name);
2074                 }
2075                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2076                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2077                                 CLAW_RC_NAME_MISMATCH);
2078                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2079                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2080                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2081                         dev_warn(tdev, "Adapter name %s for %s does not match"
2082                                 " the remote host name %s\n",
2083                                 p_sysval->WS_name,
2084                                 dev->name,
2085                                 temp_ws_name);
2086                 }
2087                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2088                     (p_env->packing == 0)) {
2089                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2090                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2091                         dev_warn(tdev,
2092                                 "The local write buffer is smaller than the"
2093                                 " remote read buffer\n");
2094                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2095                 }
2096                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2097                     (p_env->packing == 0)) {
2098                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2099                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2100                         dev_warn(tdev,
2101                                 "The local read buffer is smaller than the"
2102                                 " remote write buffer\n");
2103                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2104                 }
2105                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2106                 dev_info(tdev,
2107                         "CLAW device %.8s: System validate"
2108                         " completed.\n", temp_ws_name);
2109                 dev_info(tdev,
2110                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2111                         dev->name, p_sysval->read_frame_size,
2112                         p_sysval->write_frame_size);
2113                 privptr->system_validate_comp = 1;
2114                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2115                         p_env->packing = PACKING_ASK;
2116                 claw_strt_conn_req(dev);
2117                 break;
2118         case SYSTEM_VALIDATE_RESPONSE:
2119                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2120                 dev_info(tdev,
2121                         "Settings for %s validated (version=%d, "
2122                         "remote device=%d, rc=%d, adapter name=%.8s, "
2123                         "host name=%.8s)\n",
2124                         dev->name,
2125                         p_ctlbk->version,
2126                         p_ctlbk->correlator,
2127                         p_ctlbk->rc,
2128                         p_sysval->WS_name,
2129                         p_sysval->host_name);
2130                 switch (p_ctlbk->rc) {
2131                 case 0:
2132                         dev_info(tdev, "%s: CLAW device "
2133                                 "%.8s: System validate completed.\n",
2134                                 dev->name, temp_ws_name);
2135                         if (privptr->system_validate_comp == 0)
2136                                 claw_strt_conn_req(dev);
2137                         privptr->system_validate_comp = 1;
2138                         break;
2139                 case CLAW_RC_NAME_MISMATCH:
2140                         dev_warn(tdev, "Validating %s failed because of"
2141                                 " a host or adapter name mismatch\n",
2142                                 dev->name);
2143                         break;
2144                 case CLAW_RC_WRONG_VERSION:
2145                         dev_warn(tdev, "Validating %s failed because of a"
2146                                 " version conflict\n",
2147                                 dev->name);
2148                         break;
2149                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2150                         dev_warn(tdev, "Validating %s failed because of a"
2151                                 " frame size conflict\n",
2152                                 dev->name);
2153                         break;
2154                 default:
2155                         dev_warn(tdev, "The communication peer of %s rejected"
2156                                 " the connection\n",
2157                                  dev->name);
2158                         break;
2159                 }
2160                 break;
2161
2162         case CONNECTION_REQUEST:
2163                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2164                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2165                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2166                         dev->name,
2167                         p_ctlbk->version,
2168                         p_ctlbk->linkid,
2169                         p_ctlbk->correlator,
2170                         p_connect->host_name,
2171                         p_connect->WS_name);
2172                 if (privptr->active_link_ID != 0) {
2173                         claw_snd_disc(dev, p_ctlbk);
2174                         dev_info(tdev, "%s rejected a connection request"
2175                                 " because it is already active\n",
2176                                 dev->name);
2177                 }
2178                 if (p_ctlbk->linkid != 1) {
2179                         claw_snd_disc(dev, p_ctlbk);
2180                         dev_info(tdev, "%s rejected a request to open multiple"
2181                                 " connections\n",
2182                                 dev->name);
2183                 }
2184                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2185                 if (rc != 0) {
2186                         claw_snd_disc(dev, p_ctlbk);
2187                         dev_info(tdev, "%s rejected a connection request"
2188                                 " because of a type mismatch\n",
2189                                 dev->name);
2190                 }
2191                 claw_send_control(dev,
2192                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2193                         p_ctlbk->correlator,
2194                         0, p_connect->host_name,
2195                         p_connect->WS_name);
2196                 if (p_env->packing == PACKING_ASK) {
2197                         p_env->packing = PACK_SEND;
2198                         claw_snd_conn_req(dev, 0);
2199                 }
2200                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2201                         "completed link_id=%d.\n",
2202                         dev->name, temp_ws_name,
2203                         p_ctlbk->linkid);
2204                         privptr->active_link_ID = p_ctlbk->linkid;
2205                         p_ch = &privptr->channel[WRITE];
2206                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2207                 break;
2208         case CONNECTION_RESPONSE:
2209                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2210                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2211                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2212                         dev->name,
2213                         p_ctlbk->version,
2214                         p_ctlbk->linkid,
2215                         p_ctlbk->correlator,
2216                         p_ctlbk->rc,
2217                         p_connect->host_name,
2218                         p_connect->WS_name);
2219
2220                 if (p_ctlbk->rc != 0) {
2221                         dev_warn(tdev, "The communication peer of %s rejected"
2222                                 " a connection request\n",
2223                                 dev->name);
2224                         return 1;
2225                 }
2226                 rc = find_link(dev,
2227                         p_connect->host_name, p_connect->WS_name);
2228                 if (rc != 0) {
2229                         claw_snd_disc(dev, p_ctlbk);
2230                         dev_warn(tdev, "The communication peer of %s"
2231                                 " rejected a connection "
2232                                 "request because of a type mismatch\n",
2233                                  dev->name);
2234                 }
2235                 /* should be until CONNECTION_CONFIRM */
2236                 privptr->active_link_ID = -(p_ctlbk->linkid);
2237                 break;
2238         case CONNECTION_CONFIRM:
2239                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2240                 dev_info(tdev,
2241                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2242                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2243                         dev->name,
2244                         p_ctlbk->version,
2245                         p_ctlbk->linkid,
2246                         p_ctlbk->correlator,
2247                         p_connect->host_name,
2248                         p_connect->WS_name);
2249                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2250                         privptr->active_link_ID = p_ctlbk->linkid;
2251                         if (p_env->packing > PACKING_ASK) {
2252                                 dev_info(tdev,
2253                                 "%s: Confirmed Now packing\n", dev->name);
2254                                 p_env->packing = DO_PACKED;
2255                         }
2256                         p_ch = &privptr->channel[WRITE];
2257                         wake_up(&p_ch->wait);
2258                 } else {
2259                         dev_warn(tdev, "Activating %s failed because of"
2260                                 " an incorrect link ID=%d\n",
2261                                 dev->name, p_ctlbk->linkid);
2262                         claw_snd_disc(dev, p_ctlbk);
2263                 }
2264                 break;
2265         case DISCONNECT:
2266                 dev_info(tdev, "%s: Disconnect: "
2267                         "Vers=%d,link_id=%d,Corr=%d\n",
2268                         dev->name, p_ctlbk->version,
2269                         p_ctlbk->linkid, p_ctlbk->correlator);
2270                 if ((p_ctlbk->linkid == 2) &&
2271                     (p_env->packing == PACK_SEND)) {
2272                         privptr->active_link_ID = 1;
2273                         p_env->packing = DO_PACKED;
2274                 } else
2275                         privptr->active_link_ID = 0;
2276                 break;
2277         case CLAW_ERROR:
2278                 dev_warn(tdev, "The communication peer of %s failed\n",
2279                         dev->name);
2280                 break;
2281         default:
2282                 dev_warn(tdev, "The communication peer of %s sent"
2283                         " an unknown command code\n",
2284                         dev->name);
2285                 break;
2286         }
2287
2288         return 0;
2289 }   /*    end of claw_process_control    */
2290
2291
2292 /*-------------------------------------------------------------------*
2293 *               claw_send_control                                    *
2294 *                                                                    *
2295 *--------------------------------------------------------------------*/
2296
2297 static int
2298 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2299          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2300 {
2301         struct claw_privbk              *privptr;
2302         struct clawctl                  *p_ctl;
2303         struct sysval                   *p_sysval;
2304         struct conncmd                  *p_connect;
2305         struct sk_buff                  *skb;
2306
2307         CLAW_DBF_TEXT(2, setup, "sndcntl");
2308         privptr = dev->ml_priv;
2309         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2310
2311         p_ctl->command=type;
2312         p_ctl->version=CLAW_VERSION_ID;
2313         p_ctl->linkid=link;
2314         p_ctl->correlator=correlator;
2315         p_ctl->rc=rc;
2316
2317         p_sysval=(struct sysval *)&p_ctl->data;
2318         p_connect=(struct conncmd *)&p_ctl->data;
2319
2320         switch (p_ctl->command) {
2321                 case SYSTEM_VALIDATE_REQUEST:
2322                 case SYSTEM_VALIDATE_RESPONSE:
2323                         memcpy(&p_sysval->host_name, local_name, 8);
2324                         memcpy(&p_sysval->WS_name, remote_name, 8);
2325                         if (privptr->p_env->packing > 0) {
2326                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2327                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2328                         } else {
2329                                 /* how big is the biggest group of packets */
2330                            p_sysval->read_frame_size =
2331                                 privptr->p_env->read_size;
2332                            p_sysval->write_frame_size =
2333                                 privptr->p_env->write_size;
2334                         }
2335                         memset(&p_sysval->reserved, 0x00, 4);
2336                         break;
2337                 case CONNECTION_REQUEST:
2338                 case CONNECTION_RESPONSE:
2339                 case CONNECTION_CONFIRM:
2340                 case DISCONNECT:
2341                         memcpy(&p_sysval->host_name, local_name, 8);
2342                         memcpy(&p_sysval->WS_name, remote_name, 8);
2343                         if (privptr->p_env->packing > 0) {
2344                         /* How big is the biggest packet */
2345                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2346                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2347                         } else {
2348                                 memset(&p_connect->reserved1, 0x00, 4);
2349                                 memset(&p_connect->reserved2, 0x00, 4);
2350                         }
2351                         break;
2352                 default:
2353                         break;
2354         }
2355
2356         /*      write Control Record to the device                   */
2357
2358
2359         skb = dev_alloc_skb(sizeof(struct clawctl));
2360         if (!skb) {
2361                 return -ENOMEM;
2362         }
2363         memcpy(skb_put(skb, sizeof(struct clawctl)),
2364                 p_ctl, sizeof(struct clawctl));
2365         if (privptr->p_env->packing >= PACK_SEND)
2366                 claw_hw_tx(skb, dev, 1);
2367         else
2368                 claw_hw_tx(skb, dev, 0);
2369         return 0;
2370 }  /*   end of claw_send_control  */
2371
2372 /*-------------------------------------------------------------------*
2373 *               claw_snd_conn_req                                    *
2374 *                                                                    *
2375 *--------------------------------------------------------------------*/
2376 static int
2377 claw_snd_conn_req(struct net_device *dev, __u8 link)
2378 {
2379         int                rc;
2380         struct claw_privbk *privptr = dev->ml_priv;
2381         struct clawctl     *p_ctl;
2382
2383         CLAW_DBF_TEXT(2, setup, "snd_conn");
2384         rc = 1;
2385         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2386         p_ctl->linkid = link;
2387         if ( privptr->system_validate_comp==0x00 ) {
2388                 return rc;
2389         }
2390         if (privptr->p_env->packing == PACKING_ASK )
2391                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2392                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2393         if (privptr->p_env->packing == PACK_SEND)  {
2394                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2395                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2396         }
2397         if (privptr->p_env->packing == 0)
2398                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2399                         HOST_APPL_NAME, privptr->p_env->api_type);
2400         return rc;
2401
2402 }  /*  end of claw_snd_conn_req */
2403
2404
2405 /*-------------------------------------------------------------------*
2406 *               claw_snd_disc                                        *
2407 *                                                                    *
2408 *--------------------------------------------------------------------*/
2409
2410 static int
2411 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2412 {
2413         int rc;
2414         struct conncmd *  p_connect;
2415
2416         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2417         p_connect=(struct conncmd *)&p_ctl->data;
2418
2419         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2420                 p_ctl->correlator, 0,
2421                 p_connect->host_name, p_connect->WS_name);
2422         return rc;
2423 }     /*   end of claw_snd_disc    */
2424
2425
2426 /*-------------------------------------------------------------------*
2427 *               claw_snd_sys_validate_rsp                            *
2428 *                                                                    *
2429 *--------------------------------------------------------------------*/
2430
2431 static int
2432 claw_snd_sys_validate_rsp(struct net_device *dev,
2433         struct clawctl *p_ctl, __u32 return_code)
2434 {
2435         struct claw_env *  p_env;
2436         struct claw_privbk *privptr;
2437         int    rc;
2438
2439         CLAW_DBF_TEXT(2, setup, "chkresp");
2440         privptr = dev->ml_priv;
2441         p_env=privptr->p_env;
2442         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2443                 p_ctl->linkid,
2444                 p_ctl->correlator,
2445                 return_code,
2446                 p_env->host_name,
2447                 p_env->adapter_name  );
2448         return rc;
2449 }     /*    end of claw_snd_sys_validate_rsp    */
2450
2451 /*-------------------------------------------------------------------*
2452 *               claw_strt_conn_req                                   *
2453 *                                                                    *
2454 *--------------------------------------------------------------------*/
2455
2456 static int
2457 claw_strt_conn_req(struct net_device *dev )
2458 {
2459         int rc;
2460
2461         CLAW_DBF_TEXT(2, setup, "conn_req");
2462         rc=claw_snd_conn_req(dev, 1);
2463         return rc;
2464 }    /*   end of claw_strt_conn_req   */
2465
2466
2467
2468 /*-------------------------------------------------------------------*
2469  *   claw_stats                                                      *
2470  *-------------------------------------------------------------------*/
2471
2472 static struct
2473 net_device_stats *claw_stats(struct net_device *dev)
2474 {
2475         struct claw_privbk *privptr;
2476
2477         CLAW_DBF_TEXT(4, trace, "stats");
2478         privptr = dev->ml_priv;
2479         return &privptr->stats;
2480 }     /*   end of claw_stats   */
2481
2482
2483 /*-------------------------------------------------------------------*
2484 *       unpack_read                                                  *
2485 *                                                                    *
2486 *--------------------------------------------------------------------*/
2487 static void
2488 unpack_read(struct net_device *dev )
2489 {
2490         struct sk_buff *skb;
2491         struct claw_privbk *privptr;
2492         struct claw_env    *p_env;
2493         struct ccwbk    *p_this_ccw;
2494         struct ccwbk    *p_first_ccw;
2495         struct ccwbk    *p_last_ccw;
2496         struct clawph   *p_packh;
2497         void            *p_packd;
2498         struct clawctl  *p_ctlrec=NULL;
2499         struct device   *p_dev;
2500
2501         __u32   len_of_data;
2502         __u32   pack_off;
2503         __u8    link_num;
2504         __u8    mtc_this_frm=0;
2505         __u32   bytes_to_mov;
2506         int     i=0;
2507         int     p=0;
2508
2509         CLAW_DBF_TEXT(4, trace, "unpkread");
2510         p_first_ccw=NULL;
2511         p_last_ccw=NULL;
2512         p_packh=NULL;
2513         p_packd=NULL;
2514         privptr = dev->ml_priv;
2515
2516         p_dev = &privptr->channel[READ].cdev->dev;
2517         p_env = privptr->p_env;
2518         p_this_ccw=privptr->p_read_active_first;
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 = dev_get_drvdata(&cgdev->dev);
2923         dev_set_drvdata(&cgdev->cdev[READ]->dev, privptr);
2924         dev_set_drvdata(&cgdev->cdev[WRITE]->dev, 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         dev_set_drvdata(&cgdev->dev, privptr);
2962         dev_set_drvdata(&cgdev->cdev[READ]->dev, privptr);
2963         dev_set_drvdata(&cgdev->cdev[WRITE]->dev, 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 = dev_get_drvdata(&cgdev->dev);
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 = dev_get_drvdata(&cgdev->dev);
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         dev_set_drvdata(&cgdev->dev, NULL);
3075         dev_set_drvdata(&cgdev->cdev[READ]->dev, NULL);
3076         dev_set_drvdata(&cgdev->cdev[WRITE]->dev, 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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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_get_drvdata(dev);
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");