linux/drivers/s390/net/claw.c
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   1/*
   2 *    ESCON CLAW network driver
   3 *
   4 *  Linux for zSeries version
   5 *    Copyright IBM Corp. 2002, 2009
   6 *  Author(s) Original code written by:
   7 *              Kazuo Iimura <iimura@jp.ibm.com>
   8 *            Rewritten by
   9 *              Andy Richter <richtera@us.ibm.com>
  10 *              Marc Price <mwprice@us.ibm.com>
  11 *
  12 *    sysfs parms:
  13 *   group x.x.rrrr,x.x.wwww
  14 *   read_buffer nnnnnnn
  15 *   write_buffer nnnnnn
  16 *   host_name  aaaaaaaa
  17 *   adapter_name aaaaaaaa
  18 *   api_type    aaaaaaaa
  19 *
  20 *  eg.
  21 *   group  0.0.0200 0.0.0201
  22 *   read_buffer 25
  23 *   write_buffer 20
  24 *   host_name LINUX390
  25 *   adapter_name RS6K
  26 *   api_type     TCPIP
  27 *
  28 *  where
  29 *
  30 *   The device id is decided by the order entries
  31 *   are added to the group the first is claw0 the second claw1
  32 *   up to CLAW_MAX_DEV
  33 *
  34 *   rrrr     - the first of 2 consecutive device addresses used for the
  35 *              CLAW protocol.
  36 *              The specified address is always used as the input (Read)
  37 *              channel and the next address is used as the output channel.
  38 *
  39 *   wwww     - the second of 2 consecutive device addresses used for
  40 *              the CLAW protocol.
  41 *              The specified address is always used as the output
  42 *              channel and the previous address is used as the input channel.
  43 *
  44 *   read_buffer        -       specifies number of input buffers to allocate.
  45 *   write_buffer       -       specifies number of output buffers to allocate.
  46 *   host_name          -       host name
  47 *   adaptor_name       -       adaptor name
  48 *   api_type           -       API type TCPIP or API will be sent and expected
  49 *                              as ws_name
  50 *
  51 *   Note the following requirements:
  52 *   1)  host_name must match the configured adapter_name on the remote side
  53 *   2)  adaptor_name must match the configured host name on the remote side
  54 *
  55 *  Change History
  56 *    1.00  Initial release shipped
  57 *    1.10  Changes for Buffer allocation
  58 *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
  59 *    1.25  Added Packing support
  60 *    1.5
  61 */
  62
  63#define KMSG_COMPONENT "claw"
  64
  65#include <asm/ccwdev.h>
  66#include <asm/ccwgroup.h>
  67#include <asm/debug.h>
  68#include <asm/idals.h>
  69#include <asm/io.h>
  70#include <linux/bitops.h>
  71#include <linux/ctype.h>
  72#include <linux/delay.h>
  73#include <linux/errno.h>
  74#include <linux/if_arp.h>
  75#include <linux/init.h>
  76#include <linux/interrupt.h>
  77#include <linux/ip.h>
  78#include <linux/kernel.h>
  79#include <linux/module.h>
  80#include <linux/netdevice.h>
  81#include <linux/etherdevice.h>
  82#include <linux/proc_fs.h>
  83#include <linux/sched.h>
  84#include <linux/signal.h>
  85#include <linux/skbuff.h>
  86#include <linux/slab.h>
  87#include <linux/string.h>
  88#include <linux/tcp.h>
  89#include <linux/timer.h>
  90#include <linux/types.h>
  91
  92#include "claw.h"
  93
  94/*
  95   CLAW uses the s390dbf file system  see claw_trace and claw_setup
  96*/
  97
  98static char version[] __initdata = "CLAW driver";
  99static char debug_buffer[255];
 100/**
 101 * Debug Facility Stuff
 102 */
 103static debug_info_t *claw_dbf_setup;
 104static debug_info_t *claw_dbf_trace;
 105
 106/**
 107 *  CLAW Debug Facility functions
 108 */
 109static void
 110claw_unregister_debug_facility(void)
 111{
 112        if (claw_dbf_setup)
 113                debug_unregister(claw_dbf_setup);
 114        if (claw_dbf_trace)
 115                debug_unregister(claw_dbf_trace);
 116}
 117
 118static int
 119claw_register_debug_facility(void)
 120{
 121        claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
 122        claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
 123        if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
 124                claw_unregister_debug_facility();
 125                return -ENOMEM;
 126        }
 127        debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
 128        debug_set_level(claw_dbf_setup, 2);
 129        debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
 130        debug_set_level(claw_dbf_trace, 2);
 131        return 0;
 132}
 133
 134static inline void
 135claw_set_busy(struct net_device *dev)
 136{
 137 ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
 138}
 139
 140static inline void
 141claw_clear_busy(struct net_device *dev)
 142{
 143        clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
 144        netif_wake_queue(dev);
 145}
 146
 147static inline int
 148claw_check_busy(struct net_device *dev)
 149{
 150        return ((struct claw_privbk *) dev->ml_priv)->tbusy;
 151}
 152
 153static inline void
 154claw_setbit_busy(int nr,struct net_device *dev)
 155{
 156        netif_stop_queue(dev);
 157        set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 158}
 159
 160static inline void
 161claw_clearbit_busy(int nr,struct net_device *dev)
 162{
 163        clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
 164        netif_wake_queue(dev);
 165}
 166
 167static inline int
 168claw_test_and_setbit_busy(int nr,struct net_device *dev)
 169{
 170        netif_stop_queue(dev);
 171        return test_and_set_bit(nr,
 172                (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
 173}
 174
 175
 176/* Functions for the DEV methods */
 177
 178static int claw_probe(struct ccwgroup_device *cgdev);
 179static void claw_remove_device(struct ccwgroup_device *cgdev);
 180static void claw_purge_skb_queue(struct sk_buff_head *q);
 181static int claw_new_device(struct ccwgroup_device *cgdev);
 182static int claw_shutdown_device(struct ccwgroup_device *cgdev);
 183static int claw_tx(struct sk_buff *skb, struct net_device *dev);
 184static int claw_change_mtu( struct net_device *dev, int new_mtu);
 185static int claw_open(struct net_device *dev);
 186static void claw_irq_handler(struct ccw_device *cdev,
 187        unsigned long intparm, struct irb *irb);
 188static void claw_irq_tasklet ( unsigned long data );
 189static int claw_release(struct net_device *dev);
 190static void claw_write_retry ( struct chbk * p_ch );
 191static void claw_write_next ( struct chbk * p_ch );
 192static void claw_timer ( struct chbk * p_ch );
 193
 194/* Functions */
 195static int add_claw_reads(struct net_device *dev,
 196        struct ccwbk* p_first, struct ccwbk* p_last);
 197static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
 198static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
 199static int find_link(struct net_device *dev, char *host_name, char *ws_name );
 200static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
 201static int init_ccw_bk(struct net_device *dev);
 202static void probe_error( struct ccwgroup_device *cgdev);
 203static struct net_device_stats *claw_stats(struct net_device *dev);
 204static int pages_to_order_of_mag(int num_of_pages);
 205static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
 206/* sysfs Functions */
 207static ssize_t claw_hname_show(struct device *dev,
 208        struct device_attribute *attr, char *buf);
 209static ssize_t claw_hname_write(struct device *dev,
 210        struct device_attribute *attr,
 211        const char *buf, size_t count);
 212static ssize_t claw_adname_show(struct device *dev,
 213        struct device_attribute *attr, char *buf);
 214static ssize_t claw_adname_write(struct device *dev,
 215        struct device_attribute *attr,
 216        const char *buf, size_t count);
 217static ssize_t claw_apname_show(struct device *dev,
 218        struct device_attribute *attr, char *buf);
 219static ssize_t claw_apname_write(struct device *dev,
 220        struct device_attribute *attr,
 221        const char *buf, size_t count);
 222static ssize_t claw_wbuff_show(struct device *dev,
 223        struct device_attribute *attr, char *buf);
 224static ssize_t claw_wbuff_write(struct device *dev,
 225        struct device_attribute *attr,
 226        const char *buf, size_t count);
 227static ssize_t claw_rbuff_show(struct device *dev,
 228        struct device_attribute *attr, char *buf);
 229static ssize_t claw_rbuff_write(struct device *dev,
 230        struct device_attribute *attr,
 231        const char *buf, size_t count);
 232
 233/*   Functions for System Validate  */
 234static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
 235static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
 236       __u8 correlator, __u8 rc , char *local_name, char *remote_name);
 237static int claw_snd_conn_req(struct net_device *dev, __u8 link);
 238static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
 239static int claw_snd_sys_validate_rsp(struct net_device *dev,
 240        struct clawctl * p_ctl, __u32 return_code);
 241static int claw_strt_conn_req(struct net_device *dev );
 242static void claw_strt_read(struct net_device *dev, int lock);
 243static void claw_strt_out_IO(struct net_device *dev);
 244static void claw_free_wrt_buf(struct net_device *dev);
 245
 246/* Functions for unpack reads   */
 247static void unpack_read(struct net_device *dev);
 248
 249static int claw_pm_prepare(struct ccwgroup_device *gdev)
 250{
 251        return -EPERM;
 252}
 253
 254/* the root device for claw group devices */
 255static struct device *claw_root_dev;
 256
 257/* ccwgroup table  */
 258
 259static struct ccwgroup_driver claw_group_driver = {
 260        .driver = {
 261                .owner  = THIS_MODULE,
 262                .name   = "claw",
 263        },
 264        .setup       = claw_probe,
 265        .remove      = claw_remove_device,
 266        .set_online  = claw_new_device,
 267        .set_offline = claw_shutdown_device,
 268        .prepare     = claw_pm_prepare,
 269};
 270
 271static struct ccw_device_id claw_ids[] = {
 272        {CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
 273        {},
 274};
 275MODULE_DEVICE_TABLE(ccw, claw_ids);
 276
 277static struct ccw_driver claw_ccw_driver = {
 278        .driver = {
 279                .owner  = THIS_MODULE,
 280                .name   = "claw",
 281        },
 282        .ids    = claw_ids,
 283        .probe  = ccwgroup_probe_ccwdev,
 284        .remove = ccwgroup_remove_ccwdev,
 285        .int_class = IRQIO_CLW,
 286};
 287
 288static ssize_t claw_driver_group_store(struct device_driver *ddrv,
 289                                       const char *buf, size_t count)
 290{
 291        int err;
 292        err = ccwgroup_create_dev(claw_root_dev, &claw_group_driver, 2, buf);
 293        return err ? err : count;
 294}
 295static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);
 296
 297static struct attribute *claw_drv_attrs[] = {
 298        &driver_attr_group.attr,
 299        NULL,
 300};
 301static struct attribute_group claw_drv_attr_group = {
 302        .attrs = claw_drv_attrs,
 303};
 304static const struct attribute_group *claw_drv_attr_groups[] = {
 305        &claw_drv_attr_group,
 306        NULL,
 307};
 308
 309/*
 310*       Key functions
 311*/
 312
 313/*-------------------------------------------------------------------*
 314 *   claw_tx                                                         *
 315 *-------------------------------------------------------------------*/
 316
 317static int
 318claw_tx(struct sk_buff *skb, struct net_device *dev)
 319{
 320        int             rc;
 321        struct claw_privbk *privptr = dev->ml_priv;
 322        unsigned long saveflags;
 323        struct chbk *p_ch;
 324
 325        CLAW_DBF_TEXT(4, trace, "claw_tx");
 326        p_ch = &privptr->channel[WRITE_CHANNEL];
 327        spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
 328        rc=claw_hw_tx( skb, dev, 1 );
 329        spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
 330        CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
 331        if (rc)
 332                rc = NETDEV_TX_BUSY;
 333        else
 334                rc = NETDEV_TX_OK;
 335        return rc;
 336}   /*  end of claw_tx */
 337
 338/*------------------------------------------------------------------*
 339 *  pack the collect queue into an skb and return it                *
 340 *   If not packing just return the top skb from the queue          *
 341 *------------------------------------------------------------------*/
 342
 343static struct sk_buff *
 344claw_pack_skb(struct claw_privbk *privptr)
 345{
 346        struct sk_buff *new_skb,*held_skb;
 347        struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
 348        struct claw_env  *p_env = privptr->p_env;
 349        int     pkt_cnt,pk_ind,so_far;
 350
 351        new_skb = NULL;         /* assume no dice */
 352        pkt_cnt = 0;
 353        CLAW_DBF_TEXT(4, trace, "PackSKBe");
 354        if (!skb_queue_empty(&p_ch->collect_queue)) {
 355        /* some data */
 356                held_skb = skb_dequeue(&p_ch->collect_queue);
 357                if (held_skb)
 358                        dev_kfree_skb_any(held_skb);
 359                else
 360                        return NULL;
 361                if (p_env->packing != DO_PACKED)
 362                        return held_skb;
 363                /* get a new SKB we will pack at least one */
 364                new_skb = dev_alloc_skb(p_env->write_size);
 365                if (new_skb == NULL) {
 366                        atomic_inc(&held_skb->users);
 367                        skb_queue_head(&p_ch->collect_queue,held_skb);
 368                        return NULL;
 369                }
 370                /* we have packed packet and a place to put it  */
 371                pk_ind = 1;
 372                so_far = 0;
 373                new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
 374                while ((pk_ind) && (held_skb != NULL)) {
 375                        if (held_skb->len+so_far <= p_env->write_size-8) {
 376                                memcpy(skb_put(new_skb,held_skb->len),
 377                                        held_skb->data,held_skb->len);
 378                                privptr->stats.tx_packets++;
 379                                so_far += held_skb->len;
 380                                pkt_cnt++;
 381                                dev_kfree_skb_any(held_skb);
 382                                held_skb = skb_dequeue(&p_ch->collect_queue);
 383                                if (held_skb)
 384                                        atomic_dec(&held_skb->users);
 385                        } else {
 386                                pk_ind = 0;
 387                                atomic_inc(&held_skb->users);
 388                                skb_queue_head(&p_ch->collect_queue,held_skb);
 389                        }
 390                }
 391        }
 392        CLAW_DBF_TEXT(4, trace, "PackSKBx");
 393        return new_skb;
 394}
 395
 396/*-------------------------------------------------------------------*
 397 *   claw_change_mtu                                                 *
 398 *                                                                   *
 399 *-------------------------------------------------------------------*/
 400
 401static int
 402claw_change_mtu(struct net_device *dev, int new_mtu)
 403{
 404        struct claw_privbk *privptr = dev->ml_priv;
 405        int buff_size;
 406        CLAW_DBF_TEXT(4, trace, "setmtu");
 407        buff_size = privptr->p_env->write_size;
 408        if ((new_mtu < 60) || (new_mtu > buff_size)) {
 409                return -EINVAL;
 410        }
 411        dev->mtu = new_mtu;
 412        return 0;
 413}  /*   end of claw_change_mtu */
 414
 415
 416/*-------------------------------------------------------------------*
 417 *   claw_open                                                       *
 418 *                                                                   *
 419 *-------------------------------------------------------------------*/
 420static int
 421claw_open(struct net_device *dev)
 422{
 423
 424        int     rc;
 425        int     i;
 426        unsigned long       saveflags=0;
 427        unsigned long       parm;
 428        struct claw_privbk  *privptr;
 429        DECLARE_WAITQUEUE(wait, current);
 430        struct timer_list  timer;
 431        struct ccwbk *p_buf;
 432
 433        CLAW_DBF_TEXT(4, trace, "open");
 434        privptr = (struct claw_privbk *)dev->ml_priv;
 435        /*   allocate and initialize CCW blocks */
 436        if (privptr->buffs_alloc == 0) {
 437                rc=init_ccw_bk(dev);
 438                if (rc) {
 439                        CLAW_DBF_TEXT(2, trace, "openmem");
 440                        return -ENOMEM;
 441                }
 442        }
 443        privptr->system_validate_comp=0;
 444        privptr->release_pend=0;
 445        if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
 446                privptr->p_env->read_size=DEF_PACK_BUFSIZE;
 447                privptr->p_env->write_size=DEF_PACK_BUFSIZE;
 448                privptr->p_env->packing=PACKING_ASK;
 449        } else {
 450                privptr->p_env->packing=0;
 451                privptr->p_env->read_size=CLAW_FRAME_SIZE;
 452                privptr->p_env->write_size=CLAW_FRAME_SIZE;
 453        }
 454        claw_set_busy(dev);
 455        tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
 456                (unsigned long) &privptr->channel[READ_CHANNEL]);
 457        for ( i = 0; i < 2;  i++) {
 458                CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
 459                init_waitqueue_head(&privptr->channel[i].wait);
 460                /* skb_queue_head_init(&p_ch->io_queue); */
 461                if (i == WRITE_CHANNEL)
 462                        skb_queue_head_init(
 463                                &privptr->channel[WRITE_CHANNEL].collect_queue);
 464                privptr->channel[i].flag_a = 0;
 465                privptr->channel[i].IO_active = 0;
 466                privptr->channel[i].flag  &= ~CLAW_TIMER;
 467                init_timer(&timer);
 468                timer.function = (void *)claw_timer;
 469                timer.data = (unsigned long)(&privptr->channel[i]);
 470                timer.expires = jiffies + 15*HZ;
 471                add_timer(&timer);
 472                spin_lock_irqsave(get_ccwdev_lock(
 473                        privptr->channel[i].cdev), saveflags);
 474                parm = (unsigned long) &privptr->channel[i];
 475                privptr->channel[i].claw_state = CLAW_START_HALT_IO;
 476                rc = 0;
 477                add_wait_queue(&privptr->channel[i].wait, &wait);
 478                rc = ccw_device_halt(
 479                        (struct ccw_device *)privptr->channel[i].cdev,parm);
 480                set_current_state(TASK_INTERRUPTIBLE);
 481                spin_unlock_irqrestore(
 482                        get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 483                schedule();
 484                set_current_state(TASK_RUNNING);
 485                remove_wait_queue(&privptr->channel[i].wait, &wait);
 486                if(rc != 0)
 487                        ccw_check_return_code(privptr->channel[i].cdev, rc);
 488                if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 489                        del_timer(&timer);
 490        }
 491        if ((((privptr->channel[READ_CHANNEL].last_dstat |
 492                privptr->channel[WRITE_CHANNEL].last_dstat) &
 493           ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 494           (((privptr->channel[READ_CHANNEL].flag |
 495                privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
 496                dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
 497                        "%s: remote side is not ready\n", dev->name);
 498                CLAW_DBF_TEXT(2, trace, "notrdy");
 499
 500                for ( i = 0; i < 2;  i++) {
 501                        spin_lock_irqsave(
 502                                get_ccwdev_lock(privptr->channel[i].cdev),
 503                                saveflags);
 504                        parm = (unsigned long) &privptr->channel[i];
 505                        privptr->channel[i].claw_state = CLAW_STOP;
 506                        rc = ccw_device_halt(
 507                                (struct ccw_device *)&privptr->channel[i].cdev,
 508                                parm);
 509                        spin_unlock_irqrestore(
 510                                get_ccwdev_lock(privptr->channel[i].cdev),
 511                                saveflags);
 512                        if (rc != 0) {
 513                                ccw_check_return_code(
 514                                        privptr->channel[i].cdev, rc);
 515                        }
 516                }
 517                free_pages((unsigned long)privptr->p_buff_ccw,
 518                        (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 519                if (privptr->p_env->read_size < PAGE_SIZE) {
 520                        free_pages((unsigned long)privptr->p_buff_read,
 521                               (int)pages_to_order_of_mag(
 522                                        privptr->p_buff_read_num));
 523                }
 524                else {
 525                        p_buf=privptr->p_read_active_first;
 526                        while (p_buf!=NULL) {
 527                                free_pages((unsigned long)p_buf->p_buffer,
 528                                      (int)pages_to_order_of_mag(
 529                                        privptr->p_buff_pages_perread ));
 530                                p_buf=p_buf->next;
 531                        }
 532                }
 533                if (privptr->p_env->write_size < PAGE_SIZE ) {
 534                        free_pages((unsigned long)privptr->p_buff_write,
 535                             (int)pages_to_order_of_mag(
 536                                privptr->p_buff_write_num));
 537                }
 538                else {
 539                        p_buf=privptr->p_write_active_first;
 540                        while (p_buf!=NULL) {
 541                                free_pages((unsigned long)p_buf->p_buffer,
 542                                     (int)pages_to_order_of_mag(
 543                                        privptr->p_buff_pages_perwrite ));
 544                                p_buf=p_buf->next;
 545                        }
 546                }
 547                privptr->buffs_alloc = 0;
 548                privptr->channel[READ_CHANNEL].flag = 0x00;
 549                privptr->channel[WRITE_CHANNEL].flag = 0x00;
 550                privptr->p_buff_ccw=NULL;
 551                privptr->p_buff_read=NULL;
 552                privptr->p_buff_write=NULL;
 553                claw_clear_busy(dev);
 554                CLAW_DBF_TEXT(2, trace, "open EIO");
 555                return -EIO;
 556        }
 557
 558        /*   Send SystemValidate command */
 559
 560        claw_clear_busy(dev);
 561        CLAW_DBF_TEXT(4, trace, "openok");
 562        return 0;
 563}    /*     end of claw_open    */
 564
 565/*-------------------------------------------------------------------*
 566*                                                                    *
 567*       claw_irq_handler                                             *
 568*                                                                    *
 569*--------------------------------------------------------------------*/
 570static void
 571claw_irq_handler(struct ccw_device *cdev,
 572        unsigned long intparm, struct irb *irb)
 573{
 574        struct chbk *p_ch = NULL;
 575        struct claw_privbk *privptr = NULL;
 576        struct net_device *dev = NULL;
 577        struct claw_env  *p_env;
 578        struct chbk *p_ch_r=NULL;
 579
 580        CLAW_DBF_TEXT(4, trace, "clawirq");
 581        /* Bypass all 'unsolicited interrupts' */
 582        privptr = dev_get_drvdata(&cdev->dev);
 583        if (!privptr) {
 584                dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 585                        " IRQ, c-%02x d-%02x\n",
 586                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 587                CLAW_DBF_TEXT(2, trace, "badirq");
 588                return;
 589        }
 590
 591        /* Try to extract channel from driver data. */
 592        if (privptr->channel[READ_CHANNEL].cdev == cdev)
 593                p_ch = &privptr->channel[READ_CHANNEL];
 594        else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
 595                p_ch = &privptr->channel[WRITE_CHANNEL];
 596        else {
 597                dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 598                CLAW_DBF_TEXT(2, trace, "badchan");
 599                return;
 600        }
 601        CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 602
 603        dev = (struct net_device *) (p_ch->ndev);
 604        p_env=privptr->p_env;
 605
 606        /* Copy interruption response block. */
 607        memcpy(p_ch->irb, irb, sizeof(struct irb));
 608
 609        /* Check for good subchannel return code, otherwise info message */
 610        if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 611                dev_info(&cdev->dev,
 612                        "%s: subchannel check for device: %04x -"
 613                        " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 614                        dev->name, p_ch->devno,
 615                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 616                        irb->scsw.cmd.cpa);
 617                CLAW_DBF_TEXT(2, trace, "chanchk");
 618                /* return; */
 619        }
 620
 621        /* Check the reason-code of a unit check */
 622        if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 623                ccw_check_unit_check(p_ch, irb->ecw[0]);
 624
 625        /* State machine to bring the connection up, down and to restart */
 626        p_ch->last_dstat = irb->scsw.cmd.dstat;
 627
 628        switch (p_ch->claw_state) {
 629        case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 630                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 631                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 632                (p_ch->irb->scsw.cmd.stctl ==
 633                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 634                        return;
 635                wake_up(&p_ch->wait);   /* wake up claw_release */
 636                CLAW_DBF_TEXT(4, trace, "stop");
 637                return;
 638        case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 639                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 640                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 641                (p_ch->irb->scsw.cmd.stctl ==
 642                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 643                        CLAW_DBF_TEXT(4, trace, "haltio");
 644                        return;
 645                }
 646                if (p_ch->flag == CLAW_READ) {
 647                        p_ch->claw_state = CLAW_START_READ;
 648                        wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 649                } else if (p_ch->flag == CLAW_WRITE) {
 650                        p_ch->claw_state = CLAW_START_WRITE;
 651                        /*      send SYSTEM_VALIDATE                    */
 652                        claw_strt_read(dev, LOCK_NO);
 653                        claw_send_control(dev,
 654                                SYSTEM_VALIDATE_REQUEST,
 655                                0, 0, 0,
 656                                p_env->host_name,
 657                                p_env->adapter_name);
 658                } else {
 659                        dev_warn(&cdev->dev, "The CLAW device received"
 660                                " an unexpected IRQ, "
 661                                "c-%02x d-%02x\n",
 662                                irb->scsw.cmd.cstat,
 663                                irb->scsw.cmd.dstat);
 664                        return;
 665                        }
 666                CLAW_DBF_TEXT(4, trace, "haltio");
 667                return;
 668        case CLAW_START_READ:
 669                CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 670                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 671                        clear_bit(0, (void *)&p_ch->IO_active);
 672                        if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 673                            (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 674                            (p_ch->irb->ecw[0])        == 0) {
 675                                privptr->stats.rx_errors++;
 676                                dev_info(&cdev->dev,
 677                                        "%s: Restart is required after remote "
 678                                        "side recovers \n",
 679                                        dev->name);
 680                        }
 681                        CLAW_DBF_TEXT(4, trace, "notrdy");
 682                        return;
 683                }
 684                if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 685                        (p_ch->irb->scsw.cmd.dstat == 0)) {
 686                        if (test_and_set_bit(CLAW_BH_ACTIVE,
 687                                (void *)&p_ch->flag_a) == 0)
 688                                tasklet_schedule(&p_ch->tasklet);
 689                        else
 690                                CLAW_DBF_TEXT(4, trace, "PCINoBH");
 691                        CLAW_DBF_TEXT(4, trace, "PCI_read");
 692                        return;
 693                }
 694                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 695                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 696                 (p_ch->irb->scsw.cmd.stctl ==
 697                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 698                        CLAW_DBF_TEXT(4, trace, "SPend_rd");
 699                        return;
 700                }
 701                clear_bit(0, (void *)&p_ch->IO_active);
 702                claw_clearbit_busy(TB_RETRY, dev);
 703                if (test_and_set_bit(CLAW_BH_ACTIVE,
 704                        (void *)&p_ch->flag_a) == 0)
 705                        tasklet_schedule(&p_ch->tasklet);
 706                else
 707                        CLAW_DBF_TEXT(4, trace, "RdBHAct");
 708                CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 709                return;
 710        case CLAW_START_WRITE:
 711                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 712                        dev_info(&cdev->dev,
 713                                "%s: Unit Check Occurred in "
 714                                "write channel\n", dev->name);
 715                        clear_bit(0, (void *)&p_ch->IO_active);
 716                        if (p_ch->irb->ecw[0] & 0x80) {
 717                                dev_info(&cdev->dev,
 718                                        "%s: Resetting Event "
 719                                        "occurred:\n", dev->name);
 720                                init_timer(&p_ch->timer);
 721                                p_ch->timer.function =
 722                                        (void *)claw_write_retry;
 723                                p_ch->timer.data = (unsigned long)p_ch;
 724                                p_ch->timer.expires = jiffies + 10*HZ;
 725                                add_timer(&p_ch->timer);
 726                                dev_info(&cdev->dev,
 727                                        "%s: write connection "
 728                                        "restarting\n", dev->name);
 729                        }
 730                        CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 731                        return;
 732                }
 733                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 734                        clear_bit(0, (void *)&p_ch->IO_active);
 735                        dev_info(&cdev->dev,
 736                                "%s: Unit Exception "
 737                                "occurred in write channel\n",
 738                                dev->name);
 739                }
 740                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 741                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 742                (p_ch->irb->scsw.cmd.stctl ==
 743                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 744                        CLAW_DBF_TEXT(4, trace, "writeUE");
 745                        return;
 746                }
 747                clear_bit(0, (void *)&p_ch->IO_active);
 748                if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 749                        claw_write_next(p_ch);
 750                        claw_clearbit_busy(TB_TX, dev);
 751                        claw_clear_busy(dev);
 752                }
 753                p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
 754                if (test_and_set_bit(CLAW_BH_ACTIVE,
 755                        (void *)&p_ch_r->flag_a) == 0)
 756                        tasklet_schedule(&p_ch_r->tasklet);
 757                CLAW_DBF_TEXT(4, trace, "StWtExit");
 758                return;
 759        default:
 760                dev_warn(&cdev->dev,
 761                        "The CLAW device for %s received an unexpected IRQ\n",
 762                         dev->name);
 763                CLAW_DBF_TEXT(2, trace, "badIRQ");
 764                return;
 765        }
 766
 767}       /*   end of claw_irq_handler    */
 768
 769
 770/*-------------------------------------------------------------------*
 771*       claw_irq_tasklet                                             *
 772*                                                                    *
 773*--------------------------------------------------------------------*/
 774static void
 775claw_irq_tasklet ( unsigned long data )
 776{
 777        struct chbk * p_ch;
 778        struct net_device  *dev;
 779
 780        p_ch = (struct chbk *) data;
 781        dev = (struct net_device *)p_ch->ndev;
 782        CLAW_DBF_TEXT(4, trace, "IRQtask");
 783        unpack_read(dev);
 784        clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 785        CLAW_DBF_TEXT(4, trace, "TskletXt");
 786        return;
 787}       /*    end of claw_irq_bh    */
 788
 789/*-------------------------------------------------------------------*
 790*       claw_release                                                 *
 791*                                                                    *
 792*--------------------------------------------------------------------*/
 793static int
 794claw_release(struct net_device *dev)
 795{
 796        int                rc;
 797        int                i;
 798        unsigned long      saveflags;
 799        unsigned long      parm;
 800        struct claw_privbk *privptr;
 801        DECLARE_WAITQUEUE(wait, current);
 802        struct ccwbk*             p_this_ccw;
 803        struct ccwbk*             p_buf;
 804
 805        if (!dev)
 806                return 0;
 807        privptr = (struct claw_privbk *)dev->ml_priv;
 808        if (!privptr)
 809                return 0;
 810        CLAW_DBF_TEXT(4, trace, "release");
 811        privptr->release_pend=1;
 812        claw_setbit_busy(TB_STOP,dev);
 813        for ( i = 1; i >=0 ;  i--) {
 814                spin_lock_irqsave(
 815                        get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 816             /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
 817                privptr->channel[i].claw_state = CLAW_STOP;
 818                privptr->channel[i].IO_active = 0;
 819                parm = (unsigned long) &privptr->channel[i];
 820                if (i == WRITE_CHANNEL)
 821                        claw_purge_skb_queue(
 822                                &privptr->channel[WRITE_CHANNEL].collect_queue);
 823                rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 824                if (privptr->system_validate_comp==0x00)  /* never opened? */
 825                   init_waitqueue_head(&privptr->channel[i].wait);
 826                add_wait_queue(&privptr->channel[i].wait, &wait);
 827                set_current_state(TASK_INTERRUPTIBLE);
 828                spin_unlock_irqrestore(
 829                        get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 830                schedule();
 831                set_current_state(TASK_RUNNING);
 832                remove_wait_queue(&privptr->channel[i].wait, &wait);
 833                if (rc != 0) {
 834                        ccw_check_return_code(privptr->channel[i].cdev, rc);
 835                }
 836        }
 837        if (privptr->pk_skb != NULL) {
 838                dev_kfree_skb_any(privptr->pk_skb);
 839                privptr->pk_skb = NULL;
 840        }
 841        if(privptr->buffs_alloc != 1) {
 842                CLAW_DBF_TEXT(4, trace, "none2fre");
 843                return 0;
 844        }
 845        CLAW_DBF_TEXT(4, trace, "freebufs");
 846        if (privptr->p_buff_ccw != NULL) {
 847                free_pages((unsigned long)privptr->p_buff_ccw,
 848                        (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 849        }
 850        CLAW_DBF_TEXT(4, trace, "freeread");
 851        if (privptr->p_env->read_size < PAGE_SIZE) {
 852            if (privptr->p_buff_read != NULL) {
 853                free_pages((unsigned long)privptr->p_buff_read,
 854                      (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 855                }
 856        }
 857        else {
 858                p_buf=privptr->p_read_active_first;
 859                while (p_buf!=NULL) {
 860                        free_pages((unsigned long)p_buf->p_buffer,
 861                             (int)pages_to_order_of_mag(
 862                                privptr->p_buff_pages_perread ));
 863                        p_buf=p_buf->next;
 864                }
 865        }
 866         CLAW_DBF_TEXT(4, trace, "freewrit");
 867        if (privptr->p_env->write_size < PAGE_SIZE ) {
 868                free_pages((unsigned long)privptr->p_buff_write,
 869                      (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 870        }
 871        else {
 872                p_buf=privptr->p_write_active_first;
 873                while (p_buf!=NULL) {
 874                        free_pages((unsigned long)p_buf->p_buffer,
 875                              (int)pages_to_order_of_mag(
 876                              privptr->p_buff_pages_perwrite ));
 877                        p_buf=p_buf->next;
 878                }
 879        }
 880         CLAW_DBF_TEXT(4, trace, "clearptr");
 881        privptr->buffs_alloc = 0;
 882        privptr->p_buff_ccw=NULL;
 883        privptr->p_buff_read=NULL;
 884        privptr->p_buff_write=NULL;
 885        privptr->system_validate_comp=0;
 886        privptr->release_pend=0;
 887        /*      Remove any writes that were pending and reset all reads   */
 888        p_this_ccw=privptr->p_read_active_first;
 889        while (p_this_ccw!=NULL) {
 890                p_this_ccw->header.length=0xffff;
 891                p_this_ccw->header.opcode=0xff;
 892                p_this_ccw->header.flag=0x00;
 893                p_this_ccw=p_this_ccw->next;
 894        }
 895
 896        while (privptr->p_write_active_first!=NULL) {
 897                p_this_ccw=privptr->p_write_active_first;
 898                p_this_ccw->header.flag=CLAW_PENDING;
 899                privptr->p_write_active_first=p_this_ccw->next;
 900                p_this_ccw->next=privptr->p_write_free_chain;
 901                privptr->p_write_free_chain=p_this_ccw;
 902                ++privptr->write_free_count;
 903        }
 904        privptr->p_write_active_last=NULL;
 905        privptr->mtc_logical_link = -1;
 906        privptr->mtc_skipping = 1;
 907        privptr->mtc_offset=0;
 908
 909        if (((privptr->channel[READ_CHANNEL].last_dstat |
 910                privptr->channel[WRITE_CHANNEL].last_dstat) &
 911                ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 912                dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
 913                        "Deactivating %s completed with incorrect"
 914                        " subchannel status "
 915                        "(read %02x, write %02x)\n",
 916                dev->name,
 917                privptr->channel[READ_CHANNEL].last_dstat,
 918                privptr->channel[WRITE_CHANNEL].last_dstat);
 919                 CLAW_DBF_TEXT(2, trace, "badclose");
 920        }
 921        CLAW_DBF_TEXT(4, trace, "rlsexit");
 922        return 0;
 923}      /* end of claw_release     */
 924
 925/*-------------------------------------------------------------------*
 926*       claw_write_retry                                             *
 927*                                                                    *
 928*--------------------------------------------------------------------*/
 929
 930static void
 931claw_write_retry ( struct chbk *p_ch )
 932{
 933
 934        struct net_device  *dev=p_ch->ndev;
 935
 936        CLAW_DBF_TEXT(4, trace, "w_retry");
 937        if (p_ch->claw_state == CLAW_STOP) {
 938                return;
 939        }
 940        claw_strt_out_IO( dev );
 941        CLAW_DBF_TEXT(4, trace, "rtry_xit");
 942        return;
 943}      /* end of claw_write_retry      */
 944
 945
 946/*-------------------------------------------------------------------*
 947*       claw_write_next                                              *
 948*                                                                    *
 949*--------------------------------------------------------------------*/
 950
 951static void
 952claw_write_next ( struct chbk * p_ch )
 953{
 954
 955        struct net_device  *dev;
 956        struct claw_privbk *privptr=NULL;
 957        struct sk_buff *pk_skb;
 958
 959        CLAW_DBF_TEXT(4, trace, "claw_wrt");
 960        if (p_ch->claw_state == CLAW_STOP)
 961                return;
 962        dev = (struct net_device *) p_ch->ndev;
 963        privptr = (struct claw_privbk *) dev->ml_priv;
 964        claw_free_wrt_buf( dev );
 965        if ((privptr->write_free_count > 0) &&
 966            !skb_queue_empty(&p_ch->collect_queue)) {
 967                pk_skb = claw_pack_skb(privptr);
 968                while (pk_skb != NULL) {
 969                        claw_hw_tx(pk_skb, dev, 1);
 970                        if (privptr->write_free_count > 0) {
 971                                pk_skb = claw_pack_skb(privptr);
 972                        } else
 973                                pk_skb = NULL;
 974                }
 975        }
 976        if (privptr->p_write_active_first!=NULL) {
 977                claw_strt_out_IO(dev);
 978        }
 979        return;
 980}      /* end of claw_write_next      */
 981
 982/*-------------------------------------------------------------------*
 983*                                                                    *
 984*       claw_timer                                                   *
 985*--------------------------------------------------------------------*/
 986
 987static void
 988claw_timer ( struct chbk * p_ch )
 989{
 990        CLAW_DBF_TEXT(4, trace, "timer");
 991        p_ch->flag |= CLAW_TIMER;
 992        wake_up(&p_ch->wait);
 993        return;
 994}      /* end of claw_timer  */
 995
 996/*
 997*
 998*       functions
 999*/
1000
1001
1002/*-------------------------------------------------------------------*
1003*                                                                    *
1004*     pages_to_order_of_mag                                          *
1005*                                                                    *
1006*    takes a number of pages from 1 to 512 and returns the           *
1007*    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1008*    of magnitude get_free_pages() has an upper order of 9           *
1009*--------------------------------------------------------------------*/
1010
1011static int
1012pages_to_order_of_mag(int num_of_pages)
1013{
1014        int     order_of_mag=1;         /* assume 2 pages */
1015        int     nump;
1016
1017        CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1018        if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1019        /* 512 pages = 2Meg on 4k page systems */
1020        if (num_of_pages >= 512) {return 9; }
1021        /* we have two or more pages order is at least 1 */
1022        for (nump=2 ;nump <= 512;nump*=2) {
1023          if (num_of_pages <= nump)
1024                  break;
1025          order_of_mag +=1;
1026        }
1027        if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1028        CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1029        return order_of_mag;
1030}
1031
1032/*-------------------------------------------------------------------*
1033*                                                                    *
1034*     add_claw_reads                                                 *
1035*                                                                    *
1036*--------------------------------------------------------------------*/
1037static int
1038add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1039        struct ccwbk* p_last)
1040{
1041        struct claw_privbk *privptr;
1042        struct ccw1  temp_ccw;
1043        struct endccw * p_end;
1044        CLAW_DBF_TEXT(4, trace, "addreads");
1045        privptr = dev->ml_priv;
1046        p_end = privptr->p_end_ccw;
1047
1048        /* first CCW and last CCW contains a new set of read channel programs
1049        *       to apend the running channel programs
1050        */
1051        if ( p_first==NULL) {
1052                CLAW_DBF_TEXT(4, trace, "addexit");
1053                return 0;
1054        }
1055
1056        /* set up ending CCW sequence for this segment */
1057        if (p_end->read1) {
1058                p_end->read1=0x00;    /*  second ending CCW is now active */
1059                /*      reset ending CCWs and setup TIC CCWs              */
1060                p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1061                p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1062                p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1063                p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1064                p_end->read2_nop2.cda=0;
1065                p_end->read2_nop2.count=1;
1066        }
1067        else {
1068                p_end->read1=0x01;  /* first ending CCW is now active */
1069                /*      reset ending CCWs and setup TIC CCWs          */
1070                p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1071                p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1072                p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1073                p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1074                p_end->read1_nop2.cda=0;
1075                p_end->read1_nop2.count=1;
1076        }
1077
1078        if ( privptr-> p_read_active_first ==NULL ) {
1079                privptr->p_read_active_first = p_first;  /*  set new first */
1080                privptr->p_read_active_last  = p_last;   /*  set new last  */
1081        }
1082        else {
1083
1084                /* set up TIC ccw  */
1085                temp_ccw.cda= (__u32)__pa(&p_first->read);
1086                temp_ccw.count=0;
1087                temp_ccw.flags=0;
1088                temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1089
1090
1091                if (p_end->read1) {
1092
1093               /* first set of CCW's is chained to the new read              */
1094               /* chain, so the second set is chained to the active chain.   */
1095               /* Therefore modify the second set to point to the new        */
1096               /* read chain set up TIC CCWs                                 */
1097               /* make sure we update the CCW so channel doesn't fetch it    */
1098               /* when it's only half done                                   */
1099                        memcpy( &p_end->read2_nop2, &temp_ccw ,
1100                                sizeof(struct ccw1));
1101                        privptr->p_read_active_last->r_TIC_1.cda=
1102                                (__u32)__pa(&p_first->read);
1103                        privptr->p_read_active_last->r_TIC_2.cda=
1104                                (__u32)__pa(&p_first->read);
1105                }
1106                else {
1107                        /* make sure we update the CCW so channel doesn't   */
1108                        /* fetch it when it is only half done               */
1109                        memcpy( &p_end->read1_nop2, &temp_ccw ,
1110                                sizeof(struct ccw1));
1111                        privptr->p_read_active_last->r_TIC_1.cda=
1112                                (__u32)__pa(&p_first->read);
1113                        privptr->p_read_active_last->r_TIC_2.cda=
1114                                (__u32)__pa(&p_first->read);
1115                }
1116                /*      chain in new set of blocks                         */
1117                privptr->p_read_active_last->next = p_first;
1118                privptr->p_read_active_last=p_last;
1119        } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1120        CLAW_DBF_TEXT(4, trace, "addexit");
1121        return 0;
1122}    /*     end of add_claw_reads   */
1123
1124/*-------------------------------------------------------------------*
1125 *   ccw_check_return_code                                           *
1126 *                                                                   *
1127 *-------------------------------------------------------------------*/
1128
1129static void
1130ccw_check_return_code(struct ccw_device *cdev, int return_code)
1131{
1132        CLAW_DBF_TEXT(4, trace, "ccwret");
1133        if (return_code != 0) {
1134                switch (return_code) {
1135                case -EBUSY: /* BUSY is a transient state no action needed */
1136                        break;
1137                case -ENODEV:
1138                        dev_err(&cdev->dev, "The remote channel adapter is not"
1139                                " available\n");
1140                        break;
1141                case -EINVAL:
1142                        dev_err(&cdev->dev,
1143                                "The status of the remote channel adapter"
1144                                " is not valid\n");
1145                        break;
1146                default:
1147                        dev_err(&cdev->dev, "The common device layer"
1148                                " returned error code %d\n",
1149                                  return_code);
1150                }
1151        }
1152        CLAW_DBF_TEXT(4, trace, "ccwret");
1153}    /*    end of ccw_check_return_code   */
1154
1155/*-------------------------------------------------------------------*
1156*       ccw_check_unit_check                                         *
1157*--------------------------------------------------------------------*/
1158
1159static void
1160ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1161{
1162        struct net_device *ndev = p_ch->ndev;
1163        struct device *dev = &p_ch->cdev->dev;
1164
1165        CLAW_DBF_TEXT(4, trace, "unitchek");
1166        dev_warn(dev, "The communication peer of %s disconnected\n",
1167                ndev->name);
1168
1169        if (sense & 0x40) {
1170                if (sense & 0x01) {
1171                        dev_warn(dev, "The remote channel adapter for"
1172                                " %s has been reset\n",
1173                                ndev->name);
1174                }
1175        } else if (sense & 0x20) {
1176                if (sense & 0x04) {
1177                        dev_warn(dev, "A data streaming timeout occurred"
1178                                " for %s\n",
1179                                ndev->name);
1180                } else if (sense & 0x10) {
1181                        dev_warn(dev, "The remote channel adapter for %s"
1182                                " is faulty\n",
1183                                ndev->name);
1184                } else {
1185                        dev_warn(dev, "A data transfer parity error occurred"
1186                                " for %s\n",
1187                                ndev->name);
1188                }
1189        } else if (sense & 0x10) {
1190                dev_warn(dev, "A read data parity error occurred"
1191                        " for %s\n",
1192                        ndev->name);
1193        }
1194
1195}   /*    end of ccw_check_unit_check    */
1196
1197/*-------------------------------------------------------------------*
1198*               find_link                                            *
1199*--------------------------------------------------------------------*/
1200static int
1201find_link(struct net_device *dev, char *host_name, char *ws_name )
1202{
1203        struct claw_privbk *privptr;
1204        struct claw_env *p_env;
1205        int    rc=0;
1206
1207        CLAW_DBF_TEXT(2, setup, "findlink");
1208        privptr = dev->ml_priv;
1209        p_env=privptr->p_env;
1210        switch (p_env->packing)
1211        {
1212                case  PACKING_ASK:
1213                        if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1214                            (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1215                             rc = EINVAL;
1216                        break;
1217                case  DO_PACKED:
1218                case  PACK_SEND:
1219                        if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1220                            (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1221                                rc = EINVAL;
1222                        break;
1223                default:
1224                        if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1225                            (memcmp(p_env->api_type , ws_name, 8)!=0))
1226                                rc = EINVAL;
1227                        break;
1228        }
1229
1230        return rc;
1231}    /*    end of find_link    */
1232
1233/*-------------------------------------------------------------------*
1234 *   claw_hw_tx                                                      *
1235 *                                                                   *
1236 *                                                                   *
1237 *-------------------------------------------------------------------*/
1238
1239static int
1240claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1241{
1242        int                             rc=0;
1243        struct claw_privbk              *privptr;
1244        struct ccwbk           *p_this_ccw;
1245        struct ccwbk           *p_first_ccw;
1246        struct ccwbk           *p_last_ccw;
1247        __u32                           numBuffers;
1248        signed long                     len_of_data;
1249        unsigned long                   bytesInThisBuffer;
1250        unsigned char                   *pDataAddress;
1251        struct endccw                   *pEnd;
1252        struct ccw1                     tempCCW;
1253        struct claw_env                 *p_env;
1254        struct clawph                   *pk_head;
1255        struct chbk                     *ch;
1256
1257        CLAW_DBF_TEXT(4, trace, "hw_tx");
1258        privptr = (struct claw_privbk *)(dev->ml_priv);
1259        p_env =privptr->p_env;
1260        claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1261        /*  scan the write queue to free any completed write packets   */
1262        p_first_ccw=NULL;
1263        p_last_ccw=NULL;
1264        if ((p_env->packing >= PACK_SEND) &&
1265            (skb->cb[1] != 'P')) {
1266                skb_push(skb,sizeof(struct clawph));
1267                pk_head=(struct clawph *)skb->data;
1268                pk_head->len=skb->len-sizeof(struct clawph);
1269                if (pk_head->len%4)  {
1270                        pk_head->len+= 4-(pk_head->len%4);
1271                        skb_pad(skb,4-(pk_head->len%4));
1272                        skb_put(skb,4-(pk_head->len%4));
1273                }
1274                if (p_env->packing == DO_PACKED)
1275                        pk_head->link_num = linkid;
1276                else
1277                        pk_head->link_num = 0;
1278                pk_head->flag = 0x00;
1279                skb_pad(skb,4);
1280                skb->cb[1] = 'P';
1281        }
1282        if (linkid == 0) {
1283                if (claw_check_busy(dev)) {
1284                        if (privptr->write_free_count!=0) {
1285                                claw_clear_busy(dev);
1286                        }
1287                        else {
1288                                claw_strt_out_IO(dev );
1289                                claw_free_wrt_buf( dev );
1290                                if (privptr->write_free_count==0) {
1291                                        ch = &privptr->channel[WRITE_CHANNEL];
1292                                        atomic_inc(&skb->users);
1293                                        skb_queue_tail(&ch->collect_queue, skb);
1294                                        goto Done;
1295                                }
1296                                else {
1297                                        claw_clear_busy(dev);
1298                                }
1299                        }
1300                }
1301                /*  tx lock  */
1302                if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1303                        ch = &privptr->channel[WRITE_CHANNEL];
1304                        atomic_inc(&skb->users);
1305                        skb_queue_tail(&ch->collect_queue, skb);
1306                        claw_strt_out_IO(dev );
1307                        rc=-EBUSY;
1308                        goto Done2;
1309                }
1310        }
1311        /*      See how many write buffers are required to hold this data */
1312        numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1313
1314        /*      If that number of buffers isn't available, give up for now */
1315        if (privptr->write_free_count < numBuffers ||
1316            privptr->p_write_free_chain == NULL ) {
1317
1318                claw_setbit_busy(TB_NOBUFFER,dev);
1319                ch = &privptr->channel[WRITE_CHANNEL];
1320                atomic_inc(&skb->users);
1321                skb_queue_tail(&ch->collect_queue, skb);
1322                CLAW_DBF_TEXT(2, trace, "clawbusy");
1323                goto Done2;
1324        }
1325        pDataAddress=skb->data;
1326        len_of_data=skb->len;
1327
1328        while (len_of_data > 0) {
1329                p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1330                if (p_this_ccw == NULL) { /* lost the race */
1331                        ch = &privptr->channel[WRITE_CHANNEL];
1332                        atomic_inc(&skb->users);
1333                        skb_queue_tail(&ch->collect_queue, skb);
1334                        goto Done2;
1335                }
1336                privptr->p_write_free_chain=p_this_ccw->next;
1337                p_this_ccw->next=NULL;
1338                --privptr->write_free_count; /* -1 */
1339                if (len_of_data >= privptr->p_env->write_size)
1340                        bytesInThisBuffer = privptr->p_env->write_size;
1341                else
1342                        bytesInThisBuffer = len_of_data;
1343                memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1344                len_of_data-=bytesInThisBuffer;
1345                pDataAddress+=(unsigned long)bytesInThisBuffer;
1346                /*      setup write CCW         */
1347                p_this_ccw->write.cmd_code = (linkid * 8) +1;
1348                if (len_of_data>0) {
1349                        p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1350                }
1351                p_this_ccw->write.count=bytesInThisBuffer;
1352                /*      now add to end of this chain    */
1353                if (p_first_ccw==NULL)    {
1354                        p_first_ccw=p_this_ccw;
1355                }
1356                if (p_last_ccw!=NULL) {
1357                        p_last_ccw->next=p_this_ccw;
1358                        /*      set up TIC ccws         */
1359                        p_last_ccw->w_TIC_1.cda=
1360                                (__u32)__pa(&p_this_ccw->write);
1361                }
1362                p_last_ccw=p_this_ccw;      /* save new last block */
1363        }
1364
1365        /*      FirstCCW and LastCCW now contain a new set of write channel
1366        *       programs to append to the running channel program
1367        */
1368
1369        if (p_first_ccw!=NULL) {
1370                /*      setup ending ccw sequence for this segment           */
1371                pEnd=privptr->p_end_ccw;
1372                if (pEnd->write1) {
1373                        pEnd->write1=0x00;   /* second end ccw is now active */
1374                        /*      set up Tic CCWs         */
1375                        p_last_ccw->w_TIC_1.cda=
1376                                (__u32)__pa(&pEnd->write2_nop1);
1377                        pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1378                        pEnd->write2_nop2.flags    =
1379                                CCW_FLAG_SLI | CCW_FLAG_SKIP;
1380                        pEnd->write2_nop2.cda=0;
1381                        pEnd->write2_nop2.count=1;
1382                }
1383                else {  /*  end of if (pEnd->write1)*/
1384                        pEnd->write1=0x01;   /* first end ccw is now active */
1385                        /*      set up Tic CCWs         */
1386                        p_last_ccw->w_TIC_1.cda=
1387                                (__u32)__pa(&pEnd->write1_nop1);
1388                        pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1389                        pEnd->write1_nop2.flags    =
1390                                CCW_FLAG_SLI | CCW_FLAG_SKIP;
1391                        pEnd->write1_nop2.cda=0;
1392                        pEnd->write1_nop2.count=1;
1393                }  /* end if if (pEnd->write1) */
1394
1395                if (privptr->p_write_active_first==NULL ) {
1396                        privptr->p_write_active_first=p_first_ccw;
1397                        privptr->p_write_active_last=p_last_ccw;
1398                }
1399                else {
1400                        /*      set up Tic CCWs         */
1401
1402                        tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1403                        tempCCW.count=0;
1404                        tempCCW.flags=0;
1405                        tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1406
1407                        if (pEnd->write1) {
1408
1409                 /*
1410                 * first set of ending CCW's is chained to the new write
1411                 * chain, so the second set is chained to the active chain
1412                 * Therefore modify the second set to point the new write chain.
1413                 * make sure we update the CCW atomically
1414                 * so channel does not fetch it when it's only half done
1415                 */
1416                                memcpy( &pEnd->write2_nop2, &tempCCW ,
1417                                        sizeof(struct ccw1));
1418                                privptr->p_write_active_last->w_TIC_1.cda=
1419                                        (__u32)__pa(&p_first_ccw->write);
1420                        }
1421                        else {
1422
1423                        /*make sure we update the CCW atomically
1424                         *so channel does not fetch it when it's only half done
1425                         */
1426                                memcpy(&pEnd->write1_nop2, &tempCCW ,
1427                                        sizeof(struct ccw1));
1428                                privptr->p_write_active_last->w_TIC_1.cda=
1429                                        (__u32)__pa(&p_first_ccw->write);
1430
1431                        } /* end if if (pEnd->write1) */
1432
1433                        privptr->p_write_active_last->next=p_first_ccw;
1434                        privptr->p_write_active_last=p_last_ccw;
1435                }
1436
1437        } /* endif (p_first_ccw!=NULL)  */
1438        dev_kfree_skb_any(skb);
1439        claw_strt_out_IO(dev );
1440        /*      if write free count is zero , set NOBUFFER       */
1441        if (privptr->write_free_count==0) {
1442                claw_setbit_busy(TB_NOBUFFER,dev);
1443        }
1444Done2:
1445        claw_clearbit_busy(TB_TX,dev);
1446Done:
1447        return(rc);
1448}    /*    end of claw_hw_tx    */
1449
1450/*-------------------------------------------------------------------*
1451*                                                                    *
1452*     init_ccw_bk                                                    *
1453*                                                                    *
1454*--------------------------------------------------------------------*/
1455
1456static int
1457init_ccw_bk(struct net_device *dev)
1458{
1459
1460        __u32   ccw_blocks_required;
1461        __u32   ccw_blocks_perpage;
1462        __u32   ccw_pages_required;
1463        __u32   claw_reads_perpage=1;
1464        __u32   claw_read_pages;
1465        __u32   claw_writes_perpage=1;
1466        __u32   claw_write_pages;
1467        void    *p_buff=NULL;
1468        struct ccwbk*p_free_chain;
1469        struct ccwbk*p_buf;
1470        struct ccwbk*p_last_CCWB;
1471        struct ccwbk*p_first_CCWB;
1472        struct endccw *p_endccw=NULL;
1473        addr_t  real_address;
1474        struct claw_privbk *privptr = dev->ml_priv;
1475        struct clawh *pClawH=NULL;
1476        addr_t   real_TIC_address;
1477        int i,j;
1478        CLAW_DBF_TEXT(4, trace, "init_ccw");
1479
1480        /*  initialize  statistics field */
1481        privptr->active_link_ID=0;
1482        /*  initialize  ccwbk pointers  */
1483        privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1484        privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1485        privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1486        privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1487        privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1488        privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1489        privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1490        privptr->buffs_alloc = 0;
1491        memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1492        memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1493        /*  initialize  free write ccwbk counter  */
1494        privptr->write_free_count=0;  /* number of free bufs on write chain */
1495        p_last_CCWB = NULL;
1496        p_first_CCWB= NULL;
1497        /*
1498        *  We need 1 CCW block for each read buffer, 1 for each
1499        *  write buffer, plus 1 for ClawSignalBlock
1500        */
1501        ccw_blocks_required =
1502                privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1503        /*
1504        * compute number of CCW blocks that will fit in a page
1505        */
1506        ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1507        ccw_pages_required=
1508                DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1509
1510        /*
1511         *  read and write sizes are set by 2 constants in claw.h
1512         *  4k and 32k.  Unpacked values other than 4k are not going to
1513         * provide good performance. With packing buffers support 32k
1514         * buffers are used.
1515         */
1516        if (privptr->p_env->read_size < PAGE_SIZE) {
1517                claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1518                claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1519                                                claw_reads_perpage);
1520         }
1521         else {       /* > or equal  */
1522                privptr->p_buff_pages_perread =
1523                        DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1524                claw_read_pages = privptr->p_env->read_buffers *
1525                                        privptr->p_buff_pages_perread;
1526         }
1527        if (privptr->p_env->write_size < PAGE_SIZE) {
1528                claw_writes_perpage =
1529                        PAGE_SIZE / privptr->p_env->write_size;
1530                claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1531                                                claw_writes_perpage);
1532
1533        }
1534        else {      /* >  or equal  */
1535                privptr->p_buff_pages_perwrite =
1536                        DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1537                claw_write_pages = privptr->p_env->write_buffers *
1538                                        privptr->p_buff_pages_perwrite;
1539        }
1540        /*
1541        *               allocate ccw_pages_required
1542        */
1543        if (privptr->p_buff_ccw==NULL) {
1544                privptr->p_buff_ccw=
1545                        (void *)__get_free_pages(__GFP_DMA,
1546                        (int)pages_to_order_of_mag(ccw_pages_required ));
1547                if (privptr->p_buff_ccw==NULL) {
1548                        return -ENOMEM;
1549                }
1550                privptr->p_buff_ccw_num=ccw_pages_required;
1551        }
1552        memset(privptr->p_buff_ccw, 0x00,
1553                privptr->p_buff_ccw_num * PAGE_SIZE);
1554
1555        /*
1556        *               obtain ending ccw block address
1557        *
1558        */
1559        privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1560        real_address  = (__u32)__pa(privptr->p_end_ccw);
1561        /*                              Initialize ending CCW block       */
1562        p_endccw=privptr->p_end_ccw;
1563        p_endccw->real=real_address;
1564        p_endccw->write1=0x00;
1565        p_endccw->read1=0x00;
1566
1567        /*      write1_nop1                                     */
1568        p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1569        p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1570        p_endccw->write1_nop1.count       = 1;
1571        p_endccw->write1_nop1.cda         = 0;
1572
1573        /*      write1_nop2                                     */
1574        p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1575        p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1576        p_endccw->write1_nop2.count      = 1;
1577        p_endccw->write1_nop2.cda        = 0;
1578
1579        /*      write2_nop1                                     */
1580        p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1581        p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1582        p_endccw->write2_nop1.count        = 1;
1583        p_endccw->write2_nop1.cda          = 0;
1584
1585        /*      write2_nop2                                     */
1586        p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1587        p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1588        p_endccw->write2_nop2.count        = 1;
1589        p_endccw->write2_nop2.cda          = 0;
1590
1591        /*      read1_nop1                                      */
1592        p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1593        p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1594        p_endccw->read1_nop1.count        = 1;
1595        p_endccw->read1_nop1.cda          = 0;
1596
1597        /*      read1_nop2                                      */
1598        p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1599        p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1600        p_endccw->read1_nop2.count        = 1;
1601        p_endccw->read1_nop2.cda          = 0;
1602
1603        /*      read2_nop1                                      */
1604        p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1605        p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1606        p_endccw->read2_nop1.count        = 1;
1607        p_endccw->read2_nop1.cda          = 0;
1608
1609        /*      read2_nop2                                      */
1610        p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1611        p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1612        p_endccw->read2_nop2.count        = 1;
1613        p_endccw->read2_nop2.cda          = 0;
1614
1615        /*
1616        *                               Build a chain of CCWs
1617        *
1618        */
1619        p_buff=privptr->p_buff_ccw;
1620
1621        p_free_chain=NULL;
1622        for (i=0 ; i < ccw_pages_required; i++ ) {
1623                real_address  = (__u32)__pa(p_buff);
1624                p_buf=p_buff;
1625                for (j=0 ; j < ccw_blocks_perpage ; j++) {
1626                        p_buf->next  = p_free_chain;
1627                        p_free_chain = p_buf;
1628                        p_buf->real=(__u32)__pa(p_buf);
1629                        ++p_buf;
1630                }
1631                p_buff+=PAGE_SIZE;
1632        }
1633        /*
1634        *                               Initialize ClawSignalBlock
1635        *
1636        */
1637        if (privptr->p_claw_signal_blk==NULL) {
1638                privptr->p_claw_signal_blk=p_free_chain;
1639                p_free_chain=p_free_chain->next;
1640                pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1641                pClawH->length=0xffff;
1642                pClawH->opcode=0xff;
1643                pClawH->flag=CLAW_BUSY;
1644        }
1645
1646        /*
1647        *               allocate write_pages_required and add to free chain
1648        */
1649        if (privptr->p_buff_write==NULL) {
1650            if (privptr->p_env->write_size < PAGE_SIZE) {
1651                privptr->p_buff_write=
1652                        (void *)__get_free_pages(__GFP_DMA,
1653                        (int)pages_to_order_of_mag(claw_write_pages ));
1654                if (privptr->p_buff_write==NULL) {
1655                        privptr->p_buff_ccw=NULL;
1656                        return -ENOMEM;
1657                }
1658                /*
1659                *                               Build CLAW write free chain
1660                *
1661                */
1662
1663                memset(privptr->p_buff_write, 0x00,
1664                        ccw_pages_required * PAGE_SIZE);
1665                privptr->p_write_free_chain=NULL;
1666
1667                p_buff=privptr->p_buff_write;
1668
1669                for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1670                        p_buf        = p_free_chain;      /*  get a CCW */
1671                        p_free_chain = p_buf->next;
1672                        p_buf->next  =privptr->p_write_free_chain;
1673                        privptr->p_write_free_chain = p_buf;
1674                        p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1675                        p_buf-> write.cda       = (__u32)__pa(p_buff);
1676                        p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1677                        p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1678                        p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1679                        p_buf-> w_read_FF.count   = 1;
1680                        p_buf-> w_read_FF.cda     =
1681                                (__u32)__pa(&p_buf-> header.flag);
1682                        p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1683                        p_buf-> w_TIC_1.flags      = 0;
1684                        p_buf-> w_TIC_1.count      = 0;
1685
1686                        if (((unsigned long)p_buff +
1687                                            privptr->p_env->write_size) >=
1688                           ((unsigned long)(p_buff+2*
1689                            (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1690                                p_buff = p_buff+privptr->p_env->write_size;
1691                        }
1692                }
1693           }
1694           else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1695           {
1696               privptr->p_write_free_chain=NULL;
1697               for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1698                   p_buff=(void *)__get_free_pages(__GFP_DMA,
1699                        (int)pages_to_order_of_mag(
1700                        privptr->p_buff_pages_perwrite) );
1701                   if (p_buff==NULL) {
1702                        free_pages((unsigned long)privptr->p_buff_ccw,
1703                              (int)pages_to_order_of_mag(
1704                                        privptr->p_buff_ccw_num));
1705                        privptr->p_buff_ccw=NULL;
1706                        p_buf=privptr->p_buff_write;
1707                        while (p_buf!=NULL) {
1708                                free_pages((unsigned long)
1709                                        p_buf->p_buffer,
1710                                        (int)pages_to_order_of_mag(
1711                                        privptr->p_buff_pages_perwrite));
1712                                p_buf=p_buf->next;
1713                        }
1714                        return -ENOMEM;
1715                   }  /* Error on get_pages   */
1716                   memset(p_buff, 0x00, privptr->p_env->write_size );
1717                   p_buf         = p_free_chain;
1718                   p_free_chain  = p_buf->next;
1719                   p_buf->next   = privptr->p_write_free_chain;
1720                   privptr->p_write_free_chain = p_buf;
1721                   privptr->p_buff_write = p_buf;
1722                   p_buf->p_buffer=(struct clawbuf *)p_buff;
1723                   p_buf-> write.cda     = (__u32)__pa(p_buff);
1724                   p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1725                   p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1726                   p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1727                   p_buf-> w_read_FF.count    = 1;
1728                   p_buf-> w_read_FF.cda      =
1729                        (__u32)__pa(&p_buf-> header.flag);
1730                   p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1731                   p_buf-> w_TIC_1.flags   = 0;
1732                   p_buf-> w_TIC_1.count   = 0;
1733               }  /* for all write_buffers   */
1734
1735           }    /* else buffers are PAGE_SIZE or bigger */
1736
1737        }
1738        privptr->p_buff_write_num=claw_write_pages;
1739        privptr->write_free_count=privptr->p_env->write_buffers;
1740
1741
1742        /*
1743        *               allocate read_pages_required and chain to free chain
1744        */
1745        if (privptr->p_buff_read==NULL) {
1746            if (privptr->p_env->read_size < PAGE_SIZE)  {
1747                privptr->p_buff_read=
1748                        (void *)__get_free_pages(__GFP_DMA,
1749                        (int)pages_to_order_of_mag(claw_read_pages) );
1750                if (privptr->p_buff_read==NULL) {
1751                        free_pages((unsigned long)privptr->p_buff_ccw,
1752                                (int)pages_to_order_of_mag(
1753                                        privptr->p_buff_ccw_num));
1754                        /* free the write pages size is < page size  */
1755                        free_pages((unsigned long)privptr->p_buff_write,
1756                                (int)pages_to_order_of_mag(
1757                                privptr->p_buff_write_num));
1758                        privptr->p_buff_ccw=NULL;
1759                        privptr->p_buff_write=NULL;
1760                        return -ENOMEM;
1761                }
1762                memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1763                privptr->p_buff_read_num=claw_read_pages;
1764                /*
1765                *                               Build CLAW read free chain
1766                *
1767                */
1768                p_buff=privptr->p_buff_read;
1769                for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1770                        p_buf        = p_free_chain;
1771                        p_free_chain = p_buf->next;
1772
1773                        if (p_last_CCWB==NULL) {
1774                                p_buf->next=NULL;
1775                                real_TIC_address=0;
1776                                p_last_CCWB=p_buf;
1777                        }
1778                        else {
1779                                p_buf->next=p_first_CCWB;
1780                                real_TIC_address=
1781                                (__u32)__pa(&p_first_CCWB -> read );
1782                        }
1783
1784                        p_first_CCWB=p_buf;
1785
1786                        p_buf->p_buffer=(struct clawbuf *)p_buff;
1787                        /*  initialize read command */
1788                        p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1789                        p_buf-> read.cda = (__u32)__pa(p_buff);
1790                        p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1791                        p_buf-> read.count       = privptr->p_env->read_size;
1792
1793                        /*  initialize read_h command */
1794                        p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1795                        p_buf-> read_h.cda =
1796                                (__u32)__pa(&(p_buf->header));
1797                        p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1798                        p_buf-> read_h.count      = sizeof(struct clawh);
1799
1800                        /*  initialize Signal command */
1801                        p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1802                        p_buf-> signal.cda =
1803                                (__u32)__pa(&(pClawH->flag));
1804                        p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1805                        p_buf-> signal.count     = 1;
1806
1807                        /*  initialize r_TIC_1 command */
1808                        p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1809                        p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1810                        p_buf-> r_TIC_1.flags = 0;
1811                        p_buf-> r_TIC_1.count      = 0;
1812
1813                        /*  initialize r_read_FF command */
1814                        p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1815                        p_buf-> r_read_FF.cda =
1816                                (__u32)__pa(&(pClawH->flag));
1817                        p_buf-> r_read_FF.flags =
1818                                CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1819                        p_buf-> r_read_FF.count    = 1;
1820
1821                        /*    initialize r_TIC_2          */
1822                        memcpy(&p_buf->r_TIC_2,
1823                                &p_buf->r_TIC_1, sizeof(struct ccw1));
1824
1825                        /*     initialize Header     */
1826                        p_buf->header.length=0xffff;
1827                        p_buf->header.opcode=0xff;
1828                        p_buf->header.flag=CLAW_PENDING;
1829
1830                        if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1831                          ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1832                                 -1)
1833                           & PAGE_MASK)) {
1834                                p_buff= p_buff+privptr->p_env->read_size;
1835                        }
1836                        else {
1837                                p_buff=
1838                                (void *)((unsigned long)
1839                                        (p_buff+2*(privptr->p_env->read_size)-1)
1840                                         & PAGE_MASK) ;
1841                        }
1842                }   /* for read_buffers   */
1843          }         /* read_size < PAGE_SIZE  */
1844          else {  /* read Size >= PAGE_SIZE  */
1845                for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1846                        p_buff = (void *)__get_free_pages(__GFP_DMA,
1847                                (int)pages_to_order_of_mag(
1848                                        privptr->p_buff_pages_perread));
1849                        if (p_buff==NULL) {
1850                                free_pages((unsigned long)privptr->p_buff_ccw,
1851                                        (int)pages_to_order_of_mag(privptr->
1852                                        p_buff_ccw_num));
1853                                /* free the write pages  */
1854                                p_buf=privptr->p_buff_write;
1855                                while (p_buf!=NULL) {
1856                                        free_pages(
1857                                            (unsigned long)p_buf->p_buffer,
1858                                            (int)pages_to_order_of_mag(
1859                                            privptr->p_buff_pages_perwrite));
1860                                        p_buf=p_buf->next;
1861                                }
1862                                /* free any read pages already alloc  */
1863                                p_buf=privptr->p_buff_read;
1864                                while (p_buf!=NULL) {
1865                                        free_pages(
1866                                            (unsigned long)p_buf->p_buffer,
1867                                            (int)pages_to_order_of_mag(
1868                                             privptr->p_buff_pages_perread));
1869                                        p_buf=p_buf->next;
1870                                }
1871                                privptr->p_buff_ccw=NULL;
1872                                privptr->p_buff_write=NULL;
1873                                return -ENOMEM;
1874                        }
1875                        memset(p_buff, 0x00, privptr->p_env->read_size);
1876                        p_buf        = p_free_chain;
1877                        privptr->p_buff_read = p_buf;
1878                        p_free_chain = p_buf->next;
1879
1880                        if (p_last_CCWB==NULL) {
1881                                p_buf->next=NULL;
1882                                real_TIC_address=0;
1883                                p_last_CCWB=p_buf;
1884                        }
1885                        else {
1886                                p_buf->next=p_first_CCWB;
1887                                real_TIC_address=
1888                                        (addr_t)__pa(
1889                                                &p_first_CCWB -> read );
1890                        }
1891
1892                        p_first_CCWB=p_buf;
1893                                /* save buff address */
1894                        p_buf->p_buffer=(struct clawbuf *)p_buff;
1895                        /*  initialize read command */
1896                        p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1897                        p_buf-> read.cda = (__u32)__pa(p_buff);
1898                        p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1899                        p_buf-> read.count       = privptr->p_env->read_size;
1900
1901                        /*  initialize read_h command */
1902                        p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1903                        p_buf-> read_h.cda =
1904                                (__u32)__pa(&(p_buf->header));
1905                        p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1906                        p_buf-> read_h.count      = sizeof(struct clawh);
1907
1908                        /*  initialize Signal command */
1909                        p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1910                        p_buf-> signal.cda =
1911                                (__u32)__pa(&(pClawH->flag));
1912                        p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1913                        p_buf-> signal.count     = 1;
1914
1915                        /*  initialize r_TIC_1 command */
1916                        p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1917                        p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1918                        p_buf-> r_TIC_1.flags = 0;
1919                        p_buf-> r_TIC_1.count      = 0;
1920
1921                        /*  initialize r_read_FF command */
1922                        p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1923                        p_buf-> r_read_FF.cda =
1924                                (__u32)__pa(&(pClawH->flag));
1925                        p_buf-> r_read_FF.flags =
1926                                CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1927                        p_buf-> r_read_FF.count    = 1;
1928
1929                        /*    initialize r_TIC_2          */
1930                        memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1931                                sizeof(struct ccw1));
1932
1933                        /*     initialize Header     */
1934                        p_buf->header.length=0xffff;
1935                        p_buf->header.opcode=0xff;
1936                        p_buf->header.flag=CLAW_PENDING;
1937
1938                }    /* For read_buffers   */
1939          }     /*  read_size >= PAGE_SIZE   */
1940        }       /*  pBuffread = NULL */
1941        add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1942        privptr->buffs_alloc = 1;
1943
1944        return 0;
1945}    /*    end of init_ccw_bk */
1946
1947/*-------------------------------------------------------------------*
1948*                                                                    *
1949*       probe_error                                                  *
1950*                                                                    *
1951*--------------------------------------------------------------------*/
1952
1953static void
1954probe_error( struct ccwgroup_device *cgdev)
1955{
1956        struct claw_privbk *privptr;
1957
1958        CLAW_DBF_TEXT(4, trace, "proberr");
1959        privptr = dev_get_drvdata(&cgdev->dev);
1960        if (privptr != NULL) {
1961                dev_set_drvdata(&cgdev->dev, NULL);
1962                kfree(privptr->p_env);
1963                kfree(privptr->p_mtc_envelope);
1964                kfree(privptr);
1965        }
1966}    /*    probe_error    */
1967
1968/*-------------------------------------------------------------------*
1969*    claw_process_control                                            *
1970*                                                                    *
1971*                                                                    *
1972*--------------------------------------------------------------------*/
1973
1974static int
1975claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1976{
1977
1978        struct clawbuf *p_buf;
1979        struct clawctl  ctlbk;
1980        struct clawctl *p_ctlbk;
1981        char    temp_host_name[8];
1982        char    temp_ws_name[8];
1983        struct claw_privbk *privptr;
1984        struct claw_env *p_env;
1985        struct sysval *p_sysval;
1986        struct conncmd *p_connect=NULL;
1987        int rc;
1988        struct chbk *p_ch = NULL;
1989        struct device *tdev;
1990        CLAW_DBF_TEXT(2, setup, "clw_cntl");
1991        udelay(1000);  /* Wait a ms for the control packets to
1992                        *catch up to each other */
1993        privptr = dev->ml_priv;
1994        p_env=privptr->p_env;
1995        tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
1996        memcpy( &temp_host_name, p_env->host_name, 8);
1997        memcpy( &temp_ws_name, p_env->adapter_name , 8);
1998        dev_info(tdev, "%s: CLAW device %.8s: "
1999                "Received Control Packet\n",
2000                dev->name, temp_ws_name);
2001        if (privptr->release_pend==1) {
2002                return 0;
2003        }
2004        p_buf=p_ccw->p_buffer;
2005        p_ctlbk=&ctlbk;
2006        if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2007                memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2008        } else {
2009                memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2010        }
2011        switch (p_ctlbk->command)
2012        {
2013        case SYSTEM_VALIDATE_REQUEST:
2014                if (p_ctlbk->version != CLAW_VERSION_ID) {
2015                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2016                                CLAW_RC_WRONG_VERSION);
2017                        dev_warn(tdev, "The communication peer of %s"
2018                                " uses an incorrect API version %d\n",
2019                                dev->name, p_ctlbk->version);
2020                }
2021                p_sysval = (struct sysval *)&(p_ctlbk->data);
2022                dev_info(tdev, "%s: Recv Sys Validate Request: "
2023                        "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2024                        "Host name=%.8s\n",
2025                        dev->name, p_ctlbk->version,
2026                        p_ctlbk->linkid,
2027                        p_ctlbk->correlator,
2028                        p_sysval->WS_name,
2029                        p_sysval->host_name);
2030                if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2031                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2032                                CLAW_RC_NAME_MISMATCH);
2033                        CLAW_DBF_TEXT(2, setup, "HSTBAD");
2034                        CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2035                        CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2036                        dev_warn(tdev,
2037                                "Host name %s for %s does not match the"
2038                                " remote adapter name %s\n",
2039                                p_sysval->host_name,
2040                                dev->name,
2041                                temp_host_name);
2042                }
2043                if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2044                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2045                                CLAW_RC_NAME_MISMATCH);
2046                        CLAW_DBF_TEXT(2, setup, "WSNBAD");
2047                        CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2048                        CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2049                        dev_warn(tdev, "Adapter name %s for %s does not match"
2050                                " the remote host name %s\n",
2051                                p_sysval->WS_name,
2052                                dev->name,
2053                                temp_ws_name);
2054                }
2055                if ((p_sysval->write_frame_size < p_env->write_size) &&
2056                    (p_env->packing == 0)) {
2057                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2058                                CLAW_RC_HOST_RCV_TOO_SMALL);
2059                        dev_warn(tdev,
2060                                "The local write buffer is smaller than the"
2061                                " remote read buffer\n");
2062                        CLAW_DBF_TEXT(2, setup, "wrtszbad");
2063                }
2064                if ((p_sysval->read_frame_size < p_env->read_size) &&
2065                    (p_env->packing == 0)) {
2066                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2067                                CLAW_RC_HOST_RCV_TOO_SMALL);
2068                        dev_warn(tdev,
2069                                "The local read buffer is smaller than the"
2070                                " remote write buffer\n");
2071                        CLAW_DBF_TEXT(2, setup, "rdsizbad");
2072                }
2073                claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2074                dev_info(tdev,
2075                        "CLAW device %.8s: System validate"
2076                        " completed.\n", temp_ws_name);
2077                dev_info(tdev,
2078                        "%s: sys Validate Rsize:%d Wsize:%d\n",
2079                        dev->name, p_sysval->read_frame_size,
2080                        p_sysval->write_frame_size);
2081                privptr->system_validate_comp = 1;
2082                if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2083                        p_env->packing = PACKING_ASK;
2084                claw_strt_conn_req(dev);
2085                break;
2086        case SYSTEM_VALIDATE_RESPONSE:
2087                p_sysval = (struct sysval *)&(p_ctlbk->data);
2088                dev_info(tdev,
2089                        "Settings for %s validated (version=%d, "
2090                        "remote device=%d, rc=%d, adapter name=%.8s, "
2091                        "host name=%.8s)\n",
2092                        dev->name,
2093                        p_ctlbk->version,
2094                        p_ctlbk->correlator,
2095                        p_ctlbk->rc,
2096                        p_sysval->WS_name,
2097                        p_sysval->host_name);
2098                switch (p_ctlbk->rc) {
2099                case 0:
2100                        dev_info(tdev, "%s: CLAW device "
2101                                "%.8s: System validate completed.\n",
2102                                dev->name, temp_ws_name);
2103                        if (privptr->system_validate_comp == 0)
2104                                claw_strt_conn_req(dev);
2105                        privptr->system_validate_comp = 1;
2106                        break;
2107                case CLAW_RC_NAME_MISMATCH:
2108                        dev_warn(tdev, "Validating %s failed because of"
2109                                " a host or adapter name mismatch\n",
2110                                dev->name);
2111                        break;
2112                case CLAW_RC_WRONG_VERSION:
2113                        dev_warn(tdev, "Validating %s failed because of a"
2114                                " version conflict\n",
2115                                dev->name);
2116                        break;
2117                case CLAW_RC_HOST_RCV_TOO_SMALL:
2118                        dev_warn(tdev, "Validating %s failed because of a"
2119                                " frame size conflict\n",
2120                                dev->name);
2121                        break;
2122                default:
2123                        dev_warn(tdev, "The communication peer of %s rejected"
2124                                " the connection\n",
2125                                 dev->name);
2126                        break;
2127                }
2128                break;
2129
2130        case CONNECTION_REQUEST:
2131                p_connect = (struct conncmd *)&(p_ctlbk->data);
2132                dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2133                        "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2134                        dev->name,
2135                        p_ctlbk->version,
2136                        p_ctlbk->linkid,
2137                        p_ctlbk->correlator,
2138                        p_connect->host_name,
2139                        p_connect->WS_name);
2140                if (privptr->active_link_ID != 0) {
2141                        claw_snd_disc(dev, p_ctlbk);
2142                        dev_info(tdev, "%s rejected a connection request"
2143                                " because it is already active\n",
2144                                dev->name);
2145                }
2146                if (p_ctlbk->linkid != 1) {
2147                        claw_snd_disc(dev, p_ctlbk);
2148                        dev_info(tdev, "%s rejected a request to open multiple"
2149                                " connections\n",
2150                                dev->name);
2151                }
2152                rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2153                if (rc != 0) {
2154                        claw_snd_disc(dev, p_ctlbk);
2155                        dev_info(tdev, "%s rejected a connection request"
2156                                " because of a type mismatch\n",
2157                                dev->name);
2158                }
2159                claw_send_control(dev,
2160                        CONNECTION_CONFIRM, p_ctlbk->linkid,
2161                        p_ctlbk->correlator,
2162                        0, p_connect->host_name,
2163                        p_connect->WS_name);
2164                if (p_env->packing == PACKING_ASK) {
2165                        p_env->packing = PACK_SEND;
2166                        claw_snd_conn_req(dev, 0);
2167                }
2168                dev_info(tdev, "%s: CLAW device %.8s: Connection "
2169                        "completed link_id=%d.\n",
2170                        dev->name, temp_ws_name,
2171                        p_ctlbk->linkid);
2172                        privptr->active_link_ID = p_ctlbk->linkid;
2173                        p_ch = &privptr->channel[WRITE_CHANNEL];
2174                        wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2175                break;
2176        case CONNECTION_RESPONSE:
2177                p_connect = (struct conncmd *)&(p_ctlbk->data);
2178                dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2179                        "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2180                        dev->name,
2181                        p_ctlbk->version,
2182                        p_ctlbk->linkid,
2183                        p_ctlbk->correlator,
2184                        p_ctlbk->rc,
2185                        p_connect->host_name,
2186                        p_connect->WS_name);
2187
2188                if (p_ctlbk->rc != 0) {
2189                        dev_warn(tdev, "The communication peer of %s rejected"
2190                                " a connection request\n",
2191                                dev->name);
2192                        return 1;
2193                }
2194                rc = find_link(dev,
2195                        p_connect->host_name, p_connect->WS_name);
2196                if (rc != 0) {
2197                        claw_snd_disc(dev, p_ctlbk);
2198                        dev_warn(tdev, "The communication peer of %s"
2199                                " rejected a connection "
2200                                "request because of a type mismatch\n",
2201                                 dev->name);
2202                }
2203                /* should be until CONNECTION_CONFIRM */
2204                privptr->active_link_ID = -(p_ctlbk->linkid);
2205                break;
2206        case CONNECTION_CONFIRM:
2207                p_connect = (struct conncmd *)&(p_ctlbk->data);
2208                dev_info(tdev,
2209                        "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2210                        "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2211                        dev->name,
2212                        p_ctlbk->version,
2213                        p_ctlbk->linkid,
2214                        p_ctlbk->correlator,
2215                        p_connect->host_name,
2216                        p_connect->WS_name);
2217                if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2218                        privptr->active_link_ID = p_ctlbk->linkid;
2219                        if (p_env->packing > PACKING_ASK) {
2220                                dev_info(tdev,
2221                                "%s: Confirmed Now packing\n", dev->name);
2222                                p_env->packing = DO_PACKED;
2223                        }
2224                        p_ch = &privptr->channel[WRITE_CHANNEL];
2225                        wake_up(&p_ch->wait);
2226                } else {
2227                        dev_warn(tdev, "Activating %s failed because of"
2228                                " an incorrect link ID=%d\n",
2229                                dev->name, p_ctlbk->linkid);
2230                        claw_snd_disc(dev, p_ctlbk);
2231                }
2232                break;
2233        case DISCONNECT:
2234                dev_info(tdev, "%s: Disconnect: "
2235                        "Vers=%d,link_id=%d,Corr=%d\n",
2236                        dev->name, p_ctlbk->version,
2237                        p_ctlbk->linkid, p_ctlbk->correlator);
2238                if ((p_ctlbk->linkid == 2) &&
2239                    (p_env->packing == PACK_SEND)) {
2240                        privptr->active_link_ID = 1;
2241                        p_env->packing = DO_PACKED;
2242                } else
2243                        privptr->active_link_ID = 0;
2244                break;
2245        case CLAW_ERROR:
2246                dev_warn(tdev, "The communication peer of %s failed\n",
2247                        dev->name);
2248                break;
2249        default:
2250                dev_warn(tdev, "The communication peer of %s sent"
2251                        " an unknown command code\n",
2252                        dev->name);
2253                break;
2254        }
2255
2256        return 0;
2257}   /*    end of claw_process_control    */
2258
2259
2260/*-------------------------------------------------------------------*
2261*               claw_send_control                                    *
2262*                                                                    *
2263*--------------------------------------------------------------------*/
2264
2265static int
2266claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2267         __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2268{
2269        struct claw_privbk              *privptr;
2270        struct clawctl                  *p_ctl;
2271        struct sysval                   *p_sysval;
2272        struct conncmd                  *p_connect;
2273        struct sk_buff                  *skb;
2274
2275        CLAW_DBF_TEXT(2, setup, "sndcntl");
2276        privptr = dev->ml_priv;
2277        p_ctl=(struct clawctl *)&privptr->ctl_bk;
2278
2279        p_ctl->command=type;
2280        p_ctl->version=CLAW_VERSION_ID;
2281        p_ctl->linkid=link;
2282        p_ctl->correlator=correlator;
2283        p_ctl->rc=rc;
2284
2285        p_sysval=(struct sysval *)&p_ctl->data;
2286        p_connect=(struct conncmd *)&p_ctl->data;
2287
2288        switch (p_ctl->command) {
2289                case SYSTEM_VALIDATE_REQUEST:
2290                case SYSTEM_VALIDATE_RESPONSE:
2291                        memcpy(&p_sysval->host_name, local_name, 8);
2292                        memcpy(&p_sysval->WS_name, remote_name, 8);
2293                        if (privptr->p_env->packing > 0) {
2294                                p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2295                                p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2296                        } else {
2297                                /* how big is the biggest group of packets */
2298                           p_sysval->read_frame_size =
2299                                privptr->p_env->read_size;
2300                           p_sysval->write_frame_size =
2301                                privptr->p_env->write_size;
2302                        }
2303                        memset(&p_sysval->reserved, 0x00, 4);
2304                        break;
2305                case CONNECTION_REQUEST:
2306                case CONNECTION_RESPONSE:
2307                case CONNECTION_CONFIRM:
2308                case DISCONNECT:
2309                        memcpy(&p_sysval->host_name, local_name, 8);
2310                        memcpy(&p_sysval->WS_name, remote_name, 8);
2311                        if (privptr->p_env->packing > 0) {
2312                        /* How big is the biggest packet */
2313                                p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2314                                p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2315                        } else {
2316                                memset(&p_connect->reserved1, 0x00, 4);
2317                                memset(&p_connect->reserved2, 0x00, 4);
2318                        }
2319                        break;
2320                default:
2321                        break;
2322        }
2323
2324        /*      write Control Record to the device                   */
2325
2326
2327        skb = dev_alloc_skb(sizeof(struct clawctl));
2328        if (!skb) {
2329                return -ENOMEM;
2330        }
2331        memcpy(skb_put(skb, sizeof(struct clawctl)),
2332                p_ctl, sizeof(struct clawctl));
2333        if (privptr->p_env->packing >= PACK_SEND)
2334                claw_hw_tx(skb, dev, 1);
2335        else
2336                claw_hw_tx(skb, dev, 0);
2337        return 0;
2338}  /*   end of claw_send_control  */
2339
2340/*-------------------------------------------------------------------*
2341*               claw_snd_conn_req                                    *
2342*                                                                    *
2343*--------------------------------------------------------------------*/
2344static int
2345claw_snd_conn_req(struct net_device *dev, __u8 link)
2346{
2347        int                rc;
2348        struct claw_privbk *privptr = dev->ml_priv;
2349        struct clawctl     *p_ctl;
2350
2351        CLAW_DBF_TEXT(2, setup, "snd_conn");
2352        rc = 1;
2353        p_ctl=(struct clawctl *)&privptr->ctl_bk;
2354        p_ctl->linkid = link;
2355        if ( privptr->system_validate_comp==0x00 ) {
2356                return rc;
2357        }
2358        if (privptr->p_env->packing == PACKING_ASK )
2359                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2360                        WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2361        if (privptr->p_env->packing == PACK_SEND)  {
2362                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2363                        WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2364        }
2365        if (privptr->p_env->packing == 0)
2366                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2367                        HOST_APPL_NAME, privptr->p_env->api_type);
2368        return rc;
2369
2370}  /*  end of claw_snd_conn_req */
2371
2372
2373/*-------------------------------------------------------------------*
2374*               claw_snd_disc                                        *
2375*                                                                    *
2376*--------------------------------------------------------------------*/
2377
2378static int
2379claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2380{
2381        int rc;
2382        struct conncmd *  p_connect;
2383
2384        CLAW_DBF_TEXT(2, setup, "snd_dsc");
2385        p_connect=(struct conncmd *)&p_ctl->data;
2386
2387        rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2388                p_ctl->correlator, 0,
2389                p_connect->host_name, p_connect->WS_name);
2390        return rc;
2391}     /*   end of claw_snd_disc    */
2392
2393
2394/*-------------------------------------------------------------------*
2395*               claw_snd_sys_validate_rsp                            *
2396*                                                                    *
2397*--------------------------------------------------------------------*/
2398
2399static int
2400claw_snd_sys_validate_rsp(struct net_device *dev,
2401        struct clawctl *p_ctl, __u32 return_code)
2402{
2403        struct claw_env *  p_env;
2404        struct claw_privbk *privptr;
2405        int    rc;
2406
2407        CLAW_DBF_TEXT(2, setup, "chkresp");
2408        privptr = dev->ml_priv;
2409        p_env=privptr->p_env;
2410        rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2411                p_ctl->linkid,
2412                p_ctl->correlator,
2413                return_code,
2414                p_env->host_name,
2415                p_env->adapter_name  );
2416        return rc;
2417}     /*    end of claw_snd_sys_validate_rsp    */
2418
2419/*-------------------------------------------------------------------*
2420*               claw_strt_conn_req                                   *
2421*                                                                    *
2422*--------------------------------------------------------------------*/
2423
2424static int
2425claw_strt_conn_req(struct net_device *dev )
2426{
2427        int rc;
2428
2429        CLAW_DBF_TEXT(2, setup, "conn_req");
2430        rc=claw_snd_conn_req(dev, 1);
2431        return rc;
2432}    /*   end of claw_strt_conn_req   */
2433
2434
2435
2436/*-------------------------------------------------------------------*
2437 *   claw_stats                                                      *
2438 *-------------------------------------------------------------------*/
2439
2440static struct
2441net_device_stats *claw_stats(struct net_device *dev)
2442{
2443        struct claw_privbk *privptr;
2444
2445        CLAW_DBF_TEXT(4, trace, "stats");
2446        privptr = dev->ml_priv;
2447        return &privptr->stats;
2448}     /*   end of claw_stats   */
2449
2450
2451/*-------------------------------------------------------------------*
2452*       unpack_read                                                  *
2453*                                                                    *
2454*--------------------------------------------------------------------*/
2455static void
2456unpack_read(struct net_device *dev )
2457{
2458        struct sk_buff *skb;
2459        struct claw_privbk *privptr;
2460        struct claw_env    *p_env;
2461        struct ccwbk    *p_this_ccw;
2462        struct ccwbk    *p_first_ccw;
2463        struct ccwbk    *p_last_ccw;
2464        struct clawph   *p_packh;
2465        void            *p_packd;
2466        struct clawctl  *p_ctlrec=NULL;
2467        struct device   *p_dev;
2468
2469        __u32   len_of_data;
2470        __u32   pack_off;
2471        __u8    link_num;
2472        __u8    mtc_this_frm=0;
2473        __u32   bytes_to_mov;
2474        int     i=0;
2475        int     p=0;
2476
2477        CLAW_DBF_TEXT(4, trace, "unpkread");
2478        p_first_ccw=NULL;
2479        p_last_ccw=NULL;
2480        p_packh=NULL;
2481        p_packd=NULL;
2482        privptr = dev->ml_priv;
2483
2484        p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2485        p_env = privptr->p_env;
2486        p_this_ccw=privptr->p_read_active_first;
2487        while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2488                pack_off = 0;
2489                p = 0;
2490                p_this_ccw->header.flag=CLAW_PENDING;
2491                privptr->p_read_active_first=p_this_ccw->next;
2492                p_this_ccw->next=NULL;
2493                p_packh = (struct clawph *)p_this_ccw->p_buffer;
2494                if ((p_env->packing == PACK_SEND) &&
2495                    (p_packh->len == 32)           &&
2496                    (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2497                        p_packh++;  /* peek past pack header */
2498                        p_ctlrec = (struct clawctl *)p_packh;
2499                        p_packh--;  /* un peek */
2500                        if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2501                            (p_ctlrec->command == CONNECTION_CONFIRM))
2502                                p_env->packing = DO_PACKED;
2503                }
2504                if (p_env->packing == DO_PACKED)
2505                        link_num=p_packh->link_num;
2506                else
2507                        link_num=p_this_ccw->header.opcode / 8;
2508                if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2509                        mtc_this_frm=1;
2510                        if (p_this_ccw->header.length!=
2511                                privptr->p_env->read_size ) {
2512                                dev_warn(p_dev,
2513                                        "The communication peer of %s"
2514                                        " sent a faulty"
2515                                        " frame of length %02x\n",
2516                                        dev->name, p_this_ccw->header.length);
2517                        }
2518                }
2519
2520                if (privptr->mtc_skipping) {
2521                        /*
2522                        *   We're in the mode of skipping past a
2523                        *   multi-frame message
2524                        *   that we can't process for some reason or other.
2525                        *   The first frame without the More-To-Come flag is
2526                        *   the last frame of the skipped message.
2527                        */
2528                        /*  in case of More-To-Come not set in this frame */
2529                        if (mtc_this_frm==0) {
2530                                privptr->mtc_skipping=0; /* Ok, the end */
2531                                privptr->mtc_logical_link=-1;
2532                        }
2533                        goto NextFrame;
2534                }
2535
2536                if (link_num==0) {
2537                        claw_process_control(dev, p_this_ccw);
2538                        CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2539                        goto NextFrame;
2540                }
2541unpack_next:
2542                if (p_env->packing == DO_PACKED) {
2543                        if (pack_off > p_env->read_size)
2544                                goto NextFrame;
2545                        p_packd = p_this_ccw->p_buffer+pack_off;
2546                        p_packh = (struct clawph *) p_packd;
2547                        if ((p_packh->len == 0) || /* done with this frame? */
2548                            (p_packh->flag != 0))
2549                                goto NextFrame;
2550                        bytes_to_mov = p_packh->len;
2551                        pack_off += bytes_to_mov+sizeof(struct clawph);
2552                        p++;
2553                } else {
2554                        bytes_to_mov=p_this_ccw->header.length;
2555                }
2556                if (privptr->mtc_logical_link<0) {
2557
2558                /*
2559                *  if More-To-Come is set in this frame then we don't know
2560                *  length of entire message, and hence have to allocate
2561                *  large buffer   */
2562
2563                /*      We are starting a new envelope  */
2564                privptr->mtc_offset=0;
2565                        privptr->mtc_logical_link=link_num;
2566                }
2567
2568                if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2569                        /*      error     */
2570                        privptr->stats.rx_frame_errors++;
2571                        goto NextFrame;
2572                }
2573                if (p_env->packing == DO_PACKED) {
2574                        memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2575                                p_packd+sizeof(struct clawph), bytes_to_mov);
2576
2577                } else  {
2578                        memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2579                                p_this_ccw->p_buffer, bytes_to_mov);
2580                }
2581                if (mtc_this_frm==0) {
2582                        len_of_data=privptr->mtc_offset+bytes_to_mov;
2583                        skb=dev_alloc_skb(len_of_data);
2584                        if (skb) {
2585                                memcpy(skb_put(skb,len_of_data),
2586                                        privptr->p_mtc_envelope,
2587                                        len_of_data);
2588                                skb->dev=dev;
2589                                skb_reset_mac_header(skb);
2590                                skb->protocol=htons(ETH_P_IP);
2591                                skb->ip_summed=CHECKSUM_UNNECESSARY;
2592                                privptr->stats.rx_packets++;
2593                                privptr->stats.rx_bytes+=len_of_data;
2594                                netif_rx(skb);
2595                        }
2596                        else {
2597                                dev_info(p_dev, "Allocating a buffer for"
2598                                        " incoming data failed\n");
2599                                privptr->stats.rx_dropped++;
2600                        }
2601                        privptr->mtc_offset=0;
2602                        privptr->mtc_logical_link=-1;
2603                }
2604                else {
2605                        privptr->mtc_offset+=bytes_to_mov;
2606                }
2607                if (p_env->packing == DO_PACKED)
2608                        goto unpack_next;
2609NextFrame:
2610                /*
2611                *   Remove ThisCCWblock from active read queue, and add it
2612                *   to queue of free blocks to be reused.
2613                */
2614                i++;
2615                p_this_ccw->header.length=0xffff;
2616                p_this_ccw->header.opcode=0xff;
2617                /*
2618                *       add this one to the free queue for later reuse
2619                */
2620                if (p_first_ccw==NULL) {
2621                        p_first_ccw = p_this_ccw;
2622                }
2623                else {
2624                        p_last_ccw->next = p_this_ccw;
2625                }
2626                p_last_ccw = p_this_ccw;
2627                /*
2628                *       chain to next block on active read queue
2629                */
2630                p_this_ccw = privptr->p_read_active_first;
2631                CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2632        } /* end of while */
2633
2634        /*      check validity                  */
2635
2636        CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2637        add_claw_reads(dev, p_first_ccw, p_last_ccw);
2638        claw_strt_read(dev, LOCK_YES);
2639        return;
2640}     /*  end of unpack_read   */
2641
2642/*-------------------------------------------------------------------*
2643*       claw_strt_read                                               *
2644*                                                                    *
2645*--------------------------------------------------------------------*/
2646static void
2647claw_strt_read (struct net_device *dev, int lock )
2648{
2649        int        rc = 0;
2650        __u32      parm;
2651        unsigned long  saveflags = 0;
2652        struct claw_privbk *privptr = dev->ml_priv;
2653        struct ccwbk*p_ccwbk;
2654        struct chbk *p_ch;
2655        struct clawh *p_clawh;
2656        p_ch = &privptr->channel[READ_CHANNEL];
2657
2658        CLAW_DBF_TEXT(4, trace, "StRdNter");
2659        p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2660        p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2661
2662        if ((privptr->p_write_active_first!=NULL &&
2663             privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2664            (privptr->p_read_active_first!=NULL &&
2665             privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2666                p_clawh->flag=CLAW_BUSY;    /* 0xff */
2667        }
2668        if (lock==LOCK_YES) {
2669                spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2670        }
2671        if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2672                CLAW_DBF_TEXT(4, trace, "HotRead");
2673                p_ccwbk=privptr->p_read_active_first;
2674                parm = (unsigned long) p_ch;
2675                rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2676                                       0xff, 0);
2677                if (rc != 0) {
2678                        ccw_check_return_code(p_ch->cdev, rc);
2679                }
2680        }
2681        else {
2682                CLAW_DBF_TEXT(2, trace, "ReadAct");
2683        }
2684
2685        if (lock==LOCK_YES) {
2686                spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2687        }
2688        CLAW_DBF_TEXT(4, trace, "StRdExit");
2689        return;
2690}       /*    end of claw_strt_read    */
2691
2692/*-------------------------------------------------------------------*
2693*       claw_strt_out_IO                                             *
2694*                                                                    *
2695*--------------------------------------------------------------------*/
2696
2697static void
2698claw_strt_out_IO( struct net_device *dev )
2699{
2700        int                     rc = 0;
2701        unsigned long           parm;
2702        struct claw_privbk      *privptr;
2703        struct chbk             *p_ch;
2704        struct ccwbk    *p_first_ccw;
2705
2706        if (!dev) {
2707                return;
2708        }
2709        privptr = (struct claw_privbk *)dev->ml_priv;
2710        p_ch = &privptr->channel[WRITE_CHANNEL];
2711
2712        CLAW_DBF_TEXT(4, trace, "strt_io");
2713        p_first_ccw=privptr->p_write_active_first;
2714
2715        if (p_ch->claw_state == CLAW_STOP)
2716                return;
2717        if (p_first_ccw == NULL) {
2718                return;
2719        }
2720        if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2721                parm = (unsigned long) p_ch;
2722                CLAW_DBF_TEXT(2, trace, "StWrtIO");
2723                rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2724                                      0xff, 0);
2725                if (rc != 0) {
2726                        ccw_check_return_code(p_ch->cdev, rc);
2727                }
2728        }
2729        dev->trans_start = jiffies;
2730        return;
2731}       /*    end of claw_strt_out_IO    */
2732
2733/*-------------------------------------------------------------------*
2734*       Free write buffers                                           *
2735*                                                                    *
2736*--------------------------------------------------------------------*/
2737
2738static void
2739claw_free_wrt_buf( struct net_device *dev )
2740{
2741
2742        struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2743        struct ccwbk*p_this_ccw;
2744        struct ccwbk*p_next_ccw;
2745
2746        CLAW_DBF_TEXT(4, trace, "freewrtb");
2747        /*  scan the write queue to free any completed write packets   */
2748        p_this_ccw=privptr->p_write_active_first;
2749        while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2750        {
2751                p_next_ccw = p_this_ccw->next;
2752                if (((p_next_ccw!=NULL) &&
2753                     (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2754                    ((p_this_ccw == privptr->p_write_active_last) &&
2755                     (p_this_ccw->header.flag!=CLAW_PENDING))) {
2756                        /* The next CCW is OK or this is  */
2757                        /* the last CCW...free it   @A1A  */
2758                        privptr->p_write_active_first=p_this_ccw->next;
2759                        p_this_ccw->header.flag=CLAW_PENDING;
2760                        p_this_ccw->next=privptr->p_write_free_chain;
2761                        privptr->p_write_free_chain=p_this_ccw;
2762                        ++privptr->write_free_count;
2763                        privptr->stats.tx_bytes+= p_this_ccw->write.count;
2764                        p_this_ccw=privptr->p_write_active_first;
2765                        privptr->stats.tx_packets++;
2766                }
2767                else {
2768                        break;
2769                }
2770        }
2771        if (privptr->write_free_count!=0) {
2772                claw_clearbit_busy(TB_NOBUFFER,dev);
2773        }
2774        /*   whole chain removed?   */
2775        if (privptr->p_write_active_first==NULL) {
2776                privptr->p_write_active_last=NULL;
2777        }
2778        CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2779        return;
2780}
2781
2782/*-------------------------------------------------------------------*
2783*       claw free netdevice                                          *
2784*                                                                    *
2785*--------------------------------------------------------------------*/
2786static void
2787claw_free_netdevice(struct net_device * dev, int free_dev)
2788{
2789        struct claw_privbk *privptr;
2790
2791        CLAW_DBF_TEXT(2, setup, "free_dev");
2792        if (!dev)
2793                return;
2794        CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2795        privptr = dev->ml_priv;
2796        if (dev->flags & IFF_RUNNING)
2797                claw_release(dev);
2798        if (privptr) {
2799                privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2800        }
2801        dev->ml_priv = NULL;
2802#ifdef MODULE
2803        if (free_dev) {
2804                free_netdev(dev);
2805        }
2806#endif
2807        CLAW_DBF_TEXT(2, setup, "free_ok");
2808}
2809
2810/**
2811 * Claw init netdevice
2812 * Initialize everything of the net device except the name and the
2813 * channel structs.
2814 */
2815static const struct net_device_ops claw_netdev_ops = {
2816        .ndo_open               = claw_open,
2817        .ndo_stop               = claw_release,
2818        .ndo_get_stats          = claw_stats,
2819        .ndo_start_xmit         = claw_tx,
2820        .ndo_change_mtu         = claw_change_mtu,
2821};
2822
2823static void
2824claw_init_netdevice(struct net_device * dev)
2825{
2826        CLAW_DBF_TEXT(2, setup, "init_dev");
2827        CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2828        dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2829        dev->hard_header_len = 0;
2830        dev->addr_len = 0;
2831        dev->type = ARPHRD_SLIP;
2832        dev->tx_queue_len = 1300;
2833        dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2834        dev->netdev_ops = &claw_netdev_ops;
2835        CLAW_DBF_TEXT(2, setup, "initok");
2836        return;
2837}
2838
2839/**
2840 * Init a new channel in the privptr->channel[i].
2841 *
2842 * @param cdev  The ccw_device to be added.
2843 *
2844 * @return 0 on success, !0 on error.
2845 */
2846static int
2847add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2848{
2849        struct chbk *p_ch;
2850        struct ccw_dev_id dev_id;
2851
2852        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2853        privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2854        p_ch = &privptr->channel[i];
2855        p_ch->cdev = cdev;
2856        snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2857        ccw_device_get_id(cdev, &dev_id);
2858        p_ch->devno = dev_id.devno;
2859        if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2860                return -ENOMEM;
2861        }
2862        return 0;
2863}
2864
2865
2866/**
2867 *
2868 * Setup an interface.
2869 *
2870 * @param cgdev  Device to be setup.
2871 *
2872 * @returns 0 on success, !0 on failure.
2873 */
2874static int
2875claw_new_device(struct ccwgroup_device *cgdev)
2876{
2877        struct claw_privbk *privptr;
2878        struct claw_env *p_env;
2879        struct net_device *dev;
2880        int ret;
2881        struct ccw_dev_id dev_id;
2882
2883        dev_info(&cgdev->dev, "add for %s\n",
2884                 dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2885        CLAW_DBF_TEXT(2, setup, "new_dev");
2886        privptr = dev_get_drvdata(&cgdev->dev);
2887        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2888        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2889        if (!privptr)
2890                return -ENODEV;
2891        p_env = privptr->p_env;
2892        ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2893        p_env->devno[READ_CHANNEL] = dev_id.devno;
2894        ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2895        p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2896        ret = add_channel(cgdev->cdev[0],0,privptr);
2897        if (ret == 0)
2898                ret = add_channel(cgdev->cdev[1],1,privptr);
2899        if (ret != 0) {
2900                dev_warn(&cgdev->dev, "Creating a CLAW group device"
2901                        " failed with error code %d\n", ret);
2902                goto out;
2903        }
2904        ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2905        if (ret != 0) {
2906                dev_warn(&cgdev->dev,
2907                        "Setting the read subchannel online"
2908                        " failed with error code %d\n", ret);
2909                goto out;
2910        }
2911        ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2912        if (ret != 0) {
2913                dev_warn(&cgdev->dev,
2914                        "Setting the write subchannel online "
2915                        "failed with error code %d\n", ret);
2916                goto out;
2917        }
2918        dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2919        if (!dev) {
2920                dev_warn(&cgdev->dev,
2921                        "Activating the CLAW device failed\n");
2922                goto out;
2923        }
2924        dev->ml_priv = privptr;
2925        dev_set_drvdata(&cgdev->dev, privptr);
2926        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2927        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2928        /* sysfs magic */
2929        SET_NETDEV_DEV(dev, &cgdev->dev);
2930        if (register_netdev(dev) != 0) {
2931                claw_free_netdevice(dev, 1);
2932                CLAW_DBF_TEXT(2, trace, "regfail");
2933                goto out;
2934        }
2935        dev->flags &=~IFF_RUNNING;
2936        if (privptr->buffs_alloc == 0) {
2937                ret=init_ccw_bk(dev);
2938                if (ret !=0) {
2939                        unregister_netdev(dev);
2940                        claw_free_netdevice(dev,1);
2941                        CLAW_DBF_TEXT(2, trace, "ccwmem");
2942                        goto out;
2943                }
2944        }
2945        privptr->channel[READ_CHANNEL].ndev = dev;
2946        privptr->channel[WRITE_CHANNEL].ndev = dev;
2947        privptr->p_env->ndev = dev;
2948
2949        dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2950                "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2951                dev->name, p_env->read_size,
2952                p_env->write_size, p_env->read_buffers,
2953                p_env->write_buffers, p_env->devno[READ_CHANNEL],
2954                p_env->devno[WRITE_CHANNEL]);
2955        dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2956                ":%.8s api_type: %.8s\n",
2957                dev->name, p_env->host_name,
2958                p_env->adapter_name , p_env->api_type);
2959        return 0;
2960out:
2961        ccw_device_set_offline(cgdev->cdev[1]);
2962        ccw_device_set_offline(cgdev->cdev[0]);
2963        return -ENODEV;
2964}
2965
2966static void
2967claw_purge_skb_queue(struct sk_buff_head *q)
2968{
2969        struct sk_buff *skb;
2970
2971        CLAW_DBF_TEXT(4, trace, "purgque");
2972        while ((skb = skb_dequeue(q))) {
2973                atomic_dec(&skb->users);
2974                dev_kfree_skb_any(skb);
2975        }
2976}
2977
2978/**
2979 * Shutdown an interface.
2980 *
2981 * @param cgdev  Device to be shut down.
2982 *
2983 * @returns 0 on success, !0 on failure.
2984 */
2985static int
2986claw_shutdown_device(struct ccwgroup_device *cgdev)
2987{
2988        struct claw_privbk *priv;
2989        struct net_device *ndev;
2990        int ret = 0;
2991
2992        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2993        priv = dev_get_drvdata(&cgdev->dev);
2994        if (!priv)
2995                return -ENODEV;
2996        ndev = priv->channel[READ_CHANNEL].ndev;
2997        if (ndev) {
2998                /* Close the device */
2999                dev_info(&cgdev->dev, "%s: shutting down\n",
3000                        ndev->name);
3001                if (ndev->flags & IFF_RUNNING)
3002                        ret = claw_release(ndev);
3003                ndev->flags &=~IFF_RUNNING;
3004                unregister_netdev(ndev);
3005                ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3006                claw_free_netdevice(ndev, 1);
3007                priv->channel[READ_CHANNEL].ndev = NULL;
3008                priv->channel[WRITE_CHANNEL].ndev = NULL;
3009                priv->p_env->ndev = NULL;
3010        }
3011        ccw_device_set_offline(cgdev->cdev[1]);
3012        ccw_device_set_offline(cgdev->cdev[0]);
3013        return ret;
3014}
3015
3016static void
3017claw_remove_device(struct ccwgroup_device *cgdev)
3018{
3019        struct claw_privbk *priv;
3020
3021        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3022        priv = dev_get_drvdata(&cgdev->dev);
3023        dev_info(&cgdev->dev, " will be removed.\n");
3024        if (cgdev->state == CCWGROUP_ONLINE)
3025                claw_shutdown_device(cgdev);
3026        kfree(priv->p_mtc_envelope);
3027        priv->p_mtc_envelope=NULL;
3028        kfree(priv->p_env);
3029        priv->p_env=NULL;
3030        kfree(priv->channel[0].irb);
3031        priv->channel[0].irb=NULL;
3032        kfree(priv->channel[1].irb);
3033        priv->channel[1].irb=NULL;
3034        kfree(priv);
3035        dev_set_drvdata(&cgdev->dev, NULL);
3036        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3037        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3038        put_device(&cgdev->dev);
3039
3040        return;
3041}
3042
3043
3044/*
3045 * sysfs attributes
3046 */
3047static ssize_t
3048claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3049{
3050        struct claw_privbk *priv;
3051        struct claw_env *  p_env;
3052
3053        priv = dev_get_drvdata(dev);
3054        if (!priv)
3055                return -ENODEV;
3056        p_env = priv->p_env;
3057        return sprintf(buf, "%s\n",p_env->host_name);
3058}
3059
3060static ssize_t
3061claw_hname_write(struct device *dev, struct device_attribute *attr,
3062         const char *buf, size_t count)
3063{
3064        struct claw_privbk *priv;
3065        struct claw_env *  p_env;
3066
3067        priv = dev_get_drvdata(dev);
3068        if (!priv)
3069                return -ENODEV;
3070        p_env = priv->p_env;
3071        if (count > MAX_NAME_LEN+1)
3072                return -EINVAL;
3073        memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3074        strncpy(p_env->host_name,buf, count);
3075        p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3076        p_env->host_name[MAX_NAME_LEN] = 0x00;
3077        CLAW_DBF_TEXT(2, setup, "HstnSet");
3078        CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3079
3080        return count;
3081}
3082
3083static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3084
3085static ssize_t
3086claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3087{
3088        struct claw_privbk *priv;
3089        struct claw_env *  p_env;
3090
3091        priv = dev_get_drvdata(dev);
3092        if (!priv)
3093                return -ENODEV;
3094        p_env = priv->p_env;
3095        return sprintf(buf, "%s\n", p_env->adapter_name);
3096}
3097
3098static ssize_t
3099claw_adname_write(struct device *dev, struct device_attribute *attr,
3100         const char *buf, size_t count)
3101{
3102        struct claw_privbk *priv;
3103        struct claw_env *  p_env;
3104
3105        priv = dev_get_drvdata(dev);
3106        if (!priv)
3107                return -ENODEV;
3108        p_env = priv->p_env;
3109        if (count > MAX_NAME_LEN+1)
3110                return -EINVAL;
3111        memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3112        strncpy(p_env->adapter_name,buf, count);
3113        p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3114        p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3115        CLAW_DBF_TEXT(2, setup, "AdnSet");
3116        CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3117
3118        return count;
3119}
3120
3121static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3122
3123static ssize_t
3124claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3125{
3126        struct claw_privbk *priv;
3127        struct claw_env *  p_env;
3128
3129        priv = dev_get_drvdata(dev);
3130        if (!priv)
3131                return -ENODEV;
3132        p_env = priv->p_env;
3133        return sprintf(buf, "%s\n",
3134                       p_env->api_type);
3135}
3136
3137static ssize_t
3138claw_apname_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->api_type, 0x20, MAX_NAME_LEN);
3151        strncpy(p_env->api_type,buf, count);
3152        p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3153        p_env->api_type[MAX_NAME_LEN] = 0x00;
3154        if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3155                p_env->read_size=DEF_PACK_BUFSIZE;
3156                p_env->write_size=DEF_PACK_BUFSIZE;
3157                p_env->packing=PACKING_ASK;
3158                CLAW_DBF_TEXT(2, setup, "PACKING");
3159        }
3160        else {
3161                p_env->packing=0;
3162                p_env->read_size=CLAW_FRAME_SIZE;
3163                p_env->write_size=CLAW_FRAME_SIZE;
3164                CLAW_DBF_TEXT(2, setup, "ApiSet");
3165        }
3166        CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3167        return count;
3168}
3169
3170static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3171
3172static ssize_t
3173claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3174{
3175        struct claw_privbk *priv;
3176        struct claw_env * p_env;
3177
3178        priv = dev_get_drvdata(dev);
3179        if (!priv)
3180                return -ENODEV;
3181        p_env = priv->p_env;
3182        return sprintf(buf, "%d\n", p_env->write_buffers);
3183}
3184
3185static ssize_t
3186claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3187        const char *buf, size_t count)
3188{
3189        struct claw_privbk *priv;
3190        struct claw_env *  p_env;
3191        int nnn,max;
3192
3193        priv = dev_get_drvdata(dev);
3194        if (!priv)
3195                return -ENODEV;
3196        p_env = priv->p_env;
3197        sscanf(buf, "%i", &nnn);
3198        if (p_env->packing) {
3199                max = 64;
3200        }
3201        else {
3202                max = 512;
3203        }
3204        if ((nnn > max ) || (nnn < 2))
3205                return -EINVAL;
3206        p_env->write_buffers = nnn;
3207        CLAW_DBF_TEXT(2, setup, "Wbufset");
3208        CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3209        return count;
3210}
3211
3212static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3213
3214static ssize_t
3215claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3216{
3217        struct claw_privbk *priv;
3218        struct claw_env *  p_env;
3219
3220        priv = dev_get_drvdata(dev);
3221        if (!priv)
3222                return -ENODEV;
3223        p_env = priv->p_env;
3224        return sprintf(buf, "%d\n", p_env->read_buffers);
3225}
3226
3227static ssize_t
3228claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3229        const char *buf, size_t count)
3230{
3231        struct claw_privbk *priv;
3232        struct claw_env *p_env;
3233        int nnn,max;
3234
3235        priv = dev_get_drvdata(dev);
3236        if (!priv)
3237                return -ENODEV;
3238        p_env = priv->p_env;
3239        sscanf(buf, "%i", &nnn);
3240        if (p_env->packing) {
3241                max = 64;
3242        }
3243        else {
3244                max = 512;
3245        }
3246        if ((nnn > max ) || (nnn < 2))
3247                return -EINVAL;
3248        p_env->read_buffers = nnn;
3249        CLAW_DBF_TEXT(2, setup, "Rbufset");
3250        CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3251        return count;
3252}
3253static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3254
3255static struct attribute *claw_attr[] = {
3256        &dev_attr_read_buffer.attr,
3257        &dev_attr_write_buffer.attr,
3258        &dev_attr_adapter_name.attr,
3259        &dev_attr_api_type.attr,
3260        &dev_attr_host_name.attr,
3261        NULL,
3262};
3263static struct attribute_group claw_attr_group = {
3264        .attrs = claw_attr,
3265};
3266static const struct attribute_group *claw_attr_groups[] = {
3267        &claw_attr_group,
3268        NULL,
3269};
3270static const struct device_type claw_devtype = {
3271        .name = "claw",
3272        .groups = claw_attr_groups,
3273};
3274
3275/*----------------------------------------------------------------*
3276 *   claw_probe                                                   *
3277 *      this function is called for each CLAW device.             *
3278 *----------------------------------------------------------------*/
3279static int claw_probe(struct ccwgroup_device *cgdev)
3280{
3281        struct claw_privbk *privptr = NULL;
3282
3283        CLAW_DBF_TEXT(2, setup, "probe");
3284        if (!get_device(&cgdev->dev))
3285                return -ENODEV;
3286        privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
3287        dev_set_drvdata(&cgdev->dev, privptr);
3288        if (privptr == NULL) {
3289                probe_error(cgdev);
3290                put_device(&cgdev->dev);
3291                CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3292                return -ENOMEM;
3293        }
3294        privptr->p_mtc_envelope = kzalloc(MAX_ENVELOPE_SIZE, GFP_KERNEL);
3295        privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
3296        if ((privptr->p_mtc_envelope == NULL) || (privptr->p_env == NULL)) {
3297                probe_error(cgdev);
3298                put_device(&cgdev->dev);
3299                CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3300                return -ENOMEM;
3301        }
3302        memcpy(privptr->p_env->adapter_name, WS_NAME_NOT_DEF, 8);
3303        memcpy(privptr->p_env->host_name, WS_NAME_NOT_DEF, 8);
3304        memcpy(privptr->p_env->api_type, WS_NAME_NOT_DEF, 8);
3305        privptr->p_env->packing = 0;
3306        privptr->p_env->write_buffers = 5;
3307        privptr->p_env->read_buffers = 5;
3308        privptr->p_env->read_size = CLAW_FRAME_SIZE;
3309        privptr->p_env->write_size = CLAW_FRAME_SIZE;
3310        privptr->p_env->p_priv = privptr;
3311        cgdev->cdev[0]->handler = claw_irq_handler;
3312        cgdev->cdev[1]->handler = claw_irq_handler;
3313        cgdev->dev.type = &claw_devtype;
3314        CLAW_DBF_TEXT(2, setup, "prbext 0");
3315
3316        return 0;
3317}  /*  end of claw_probe       */
3318
3319/*--------------------------------------------------------------------*
3320*    claw_init  and cleanup                                           *
3321*---------------------------------------------------------------------*/
3322
3323static void __exit claw_cleanup(void)
3324{
3325        ccwgroup_driver_unregister(&claw_group_driver);
3326        ccw_driver_unregister(&claw_ccw_driver);
3327        root_device_unregister(claw_root_dev);
3328        claw_unregister_debug_facility();
3329        pr_info("Driver unloaded\n");
3330}
3331
3332/**
3333 * Initialize module.
3334 * This is called just after the module is loaded.
3335 *
3336 * @return 0 on success, !0 on error.
3337 */
3338static int __init claw_init(void)
3339{
3340        int ret = 0;
3341
3342        pr_info("Loading %s\n", version);
3343        ret = claw_register_debug_facility();
3344        if (ret) {
3345                pr_err("Registering with the S/390 debug feature"
3346                        " failed with error code %d\n", ret);
3347                goto out_err;
3348        }
3349        CLAW_DBF_TEXT(2, setup, "init_mod");
3350        claw_root_dev = root_device_register("claw");
3351        ret = PTR_RET(claw_root_dev);
3352        if (ret)
3353                goto register_err;
3354        ret = ccw_driver_register(&claw_ccw_driver);
3355        if (ret)
3356                goto ccw_err;
3357        claw_group_driver.driver.groups = claw_drv_attr_groups;
3358        ret = ccwgroup_driver_register(&claw_group_driver);
3359        if (ret)
3360                goto ccwgroup_err;
3361        return 0;
3362
3363ccwgroup_err:
3364        ccw_driver_unregister(&claw_ccw_driver);
3365ccw_err:
3366        root_device_unregister(claw_root_dev);
3367register_err:
3368        CLAW_DBF_TEXT(2, setup, "init_bad");
3369        claw_unregister_debug_facility();
3370out_err:
3371        pr_err("Initializing the claw device driver failed\n");
3372        return ret;
3373}
3374
3375module_init(claw_init);
3376module_exit(claw_cleanup);
3377
3378MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3379MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3380                        "Copyright IBM Corp. 2000, 2008\n");
3381MODULE_LICENSE("GPL");
3382
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