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                remove_wait_queue(&privptr->channel[i].wait, &wait);
 485                if(rc != 0)
 486                        ccw_check_return_code(privptr->channel[i].cdev, rc);
 487                if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
 488                        del_timer(&timer);
 489        }
 490        if ((((privptr->channel[READ_CHANNEL].last_dstat |
 491                privptr->channel[WRITE_CHANNEL].last_dstat) &
 492           ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
 493           (((privptr->channel[READ_CHANNEL].flag |
 494                privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
 495                dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
 496                        "%s: remote side is not ready\n", dev->name);
 497                CLAW_DBF_TEXT(2, trace, "notrdy");
 498
 499                for ( i = 0; i < 2;  i++) {
 500                        spin_lock_irqsave(
 501                                get_ccwdev_lock(privptr->channel[i].cdev),
 502                                saveflags);
 503                        parm = (unsigned long) &privptr->channel[i];
 504                        privptr->channel[i].claw_state = CLAW_STOP;
 505                        rc = ccw_device_halt(
 506                                (struct ccw_device *)&privptr->channel[i].cdev,
 507                                parm);
 508                        spin_unlock_irqrestore(
 509                                get_ccwdev_lock(privptr->channel[i].cdev),
 510                                saveflags);
 511                        if (rc != 0) {
 512                                ccw_check_return_code(
 513                                        privptr->channel[i].cdev, rc);
 514                        }
 515                }
 516                free_pages((unsigned long)privptr->p_buff_ccw,
 517                        (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 518                if (privptr->p_env->read_size < PAGE_SIZE) {
 519                        free_pages((unsigned long)privptr->p_buff_read,
 520                               (int)pages_to_order_of_mag(
 521                                        privptr->p_buff_read_num));
 522                }
 523                else {
 524                        p_buf=privptr->p_read_active_first;
 525                        while (p_buf!=NULL) {
 526                                free_pages((unsigned long)p_buf->p_buffer,
 527                                      (int)pages_to_order_of_mag(
 528                                        privptr->p_buff_pages_perread ));
 529                                p_buf=p_buf->next;
 530                        }
 531                }
 532                if (privptr->p_env->write_size < PAGE_SIZE ) {
 533                        free_pages((unsigned long)privptr->p_buff_write,
 534                             (int)pages_to_order_of_mag(
 535                                privptr->p_buff_write_num));
 536                }
 537                else {
 538                        p_buf=privptr->p_write_active_first;
 539                        while (p_buf!=NULL) {
 540                                free_pages((unsigned long)p_buf->p_buffer,
 541                                     (int)pages_to_order_of_mag(
 542                                        privptr->p_buff_pages_perwrite ));
 543                                p_buf=p_buf->next;
 544                        }
 545                }
 546                privptr->buffs_alloc = 0;
 547                privptr->channel[READ_CHANNEL].flag = 0x00;
 548                privptr->channel[WRITE_CHANNEL].flag = 0x00;
 549                privptr->p_buff_ccw=NULL;
 550                privptr->p_buff_read=NULL;
 551                privptr->p_buff_write=NULL;
 552                claw_clear_busy(dev);
 553                CLAW_DBF_TEXT(2, trace, "open EIO");
 554                return -EIO;
 555        }
 556
 557        /*   Send SystemValidate command */
 558
 559        claw_clear_busy(dev);
 560        CLAW_DBF_TEXT(4, trace, "openok");
 561        return 0;
 562}    /*     end of claw_open    */
 563
 564/*-------------------------------------------------------------------*
 565*                                                                    *
 566*       claw_irq_handler                                             *
 567*                                                                    *
 568*--------------------------------------------------------------------*/
 569static void
 570claw_irq_handler(struct ccw_device *cdev,
 571        unsigned long intparm, struct irb *irb)
 572{
 573        struct chbk *p_ch = NULL;
 574        struct claw_privbk *privptr = NULL;
 575        struct net_device *dev = NULL;
 576        struct claw_env  *p_env;
 577        struct chbk *p_ch_r=NULL;
 578
 579        CLAW_DBF_TEXT(4, trace, "clawirq");
 580        /* Bypass all 'unsolicited interrupts' */
 581        privptr = dev_get_drvdata(&cdev->dev);
 582        if (!privptr) {
 583                dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
 584                        " IRQ, c-%02x d-%02x\n",
 585                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
 586                CLAW_DBF_TEXT(2, trace, "badirq");
 587                return;
 588        }
 589
 590        /* Try to extract channel from driver data. */
 591        if (privptr->channel[READ_CHANNEL].cdev == cdev)
 592                p_ch = &privptr->channel[READ_CHANNEL];
 593        else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
 594                p_ch = &privptr->channel[WRITE_CHANNEL];
 595        else {
 596                dev_warn(&cdev->dev, "The device is not a CLAW device\n");
 597                CLAW_DBF_TEXT(2, trace, "badchan");
 598                return;
 599        }
 600        CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
 601
 602        dev = (struct net_device *) (p_ch->ndev);
 603        p_env=privptr->p_env;
 604
 605        /* Copy interruption response block. */
 606        memcpy(p_ch->irb, irb, sizeof(struct irb));
 607
 608        /* Check for good subchannel return code, otherwise info message */
 609        if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
 610                dev_info(&cdev->dev,
 611                        "%s: subchannel check for device: %04x -"
 612                        " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
 613                        dev->name, p_ch->devno,
 614                        irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
 615                        irb->scsw.cmd.cpa);
 616                CLAW_DBF_TEXT(2, trace, "chanchk");
 617                /* return; */
 618        }
 619
 620        /* Check the reason-code of a unit check */
 621        if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
 622                ccw_check_unit_check(p_ch, irb->ecw[0]);
 623
 624        /* State machine to bring the connection up, down and to restart */
 625        p_ch->last_dstat = irb->scsw.cmd.dstat;
 626
 627        switch (p_ch->claw_state) {
 628        case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
 629                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 630                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 631                (p_ch->irb->scsw.cmd.stctl ==
 632                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
 633                        return;
 634                wake_up(&p_ch->wait);   /* wake up claw_release */
 635                CLAW_DBF_TEXT(4, trace, "stop");
 636                return;
 637        case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
 638                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 639                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 640                (p_ch->irb->scsw.cmd.stctl ==
 641                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 642                        CLAW_DBF_TEXT(4, trace, "haltio");
 643                        return;
 644                }
 645                if (p_ch->flag == CLAW_READ) {
 646                        p_ch->claw_state = CLAW_START_READ;
 647                        wake_up(&p_ch->wait); /* wake claw_open (READ)*/
 648                } else if (p_ch->flag == CLAW_WRITE) {
 649                        p_ch->claw_state = CLAW_START_WRITE;
 650                        /*      send SYSTEM_VALIDATE                    */
 651                        claw_strt_read(dev, LOCK_NO);
 652                        claw_send_control(dev,
 653                                SYSTEM_VALIDATE_REQUEST,
 654                                0, 0, 0,
 655                                p_env->host_name,
 656                                p_env->adapter_name);
 657                } else {
 658                        dev_warn(&cdev->dev, "The CLAW device received"
 659                                " an unexpected IRQ, "
 660                                "c-%02x d-%02x\n",
 661                                irb->scsw.cmd.cstat,
 662                                irb->scsw.cmd.dstat);
 663                        return;
 664                        }
 665                CLAW_DBF_TEXT(4, trace, "haltio");
 666                return;
 667        case CLAW_START_READ:
 668                CLAW_DBF_TEXT(4, trace, "ReadIRQ");
 669                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 670                        clear_bit(0, (void *)&p_ch->IO_active);
 671                        if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
 672                            (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
 673                            (p_ch->irb->ecw[0])        == 0) {
 674                                privptr->stats.rx_errors++;
 675                                dev_info(&cdev->dev,
 676                                        "%s: Restart is required after remote "
 677                                        "side recovers \n",
 678                                        dev->name);
 679                        }
 680                        CLAW_DBF_TEXT(4, trace, "notrdy");
 681                        return;
 682                }
 683                if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
 684                        (p_ch->irb->scsw.cmd.dstat == 0)) {
 685                        if (test_and_set_bit(CLAW_BH_ACTIVE,
 686                                (void *)&p_ch->flag_a) == 0)
 687                                tasklet_schedule(&p_ch->tasklet);
 688                        else
 689                                CLAW_DBF_TEXT(4, trace, "PCINoBH");
 690                        CLAW_DBF_TEXT(4, trace, "PCI_read");
 691                        return;
 692                }
 693                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 694                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 695                 (p_ch->irb->scsw.cmd.stctl ==
 696                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 697                        CLAW_DBF_TEXT(4, trace, "SPend_rd");
 698                        return;
 699                }
 700                clear_bit(0, (void *)&p_ch->IO_active);
 701                claw_clearbit_busy(TB_RETRY, dev);
 702                if (test_and_set_bit(CLAW_BH_ACTIVE,
 703                        (void *)&p_ch->flag_a) == 0)
 704                        tasklet_schedule(&p_ch->tasklet);
 705                else
 706                        CLAW_DBF_TEXT(4, trace, "RdBHAct");
 707                CLAW_DBF_TEXT(4, trace, "RdIRQXit");
 708                return;
 709        case CLAW_START_WRITE:
 710                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
 711                        dev_info(&cdev->dev,
 712                                "%s: Unit Check Occurred in "
 713                                "write channel\n", dev->name);
 714                        clear_bit(0, (void *)&p_ch->IO_active);
 715                        if (p_ch->irb->ecw[0] & 0x80) {
 716                                dev_info(&cdev->dev,
 717                                        "%s: Resetting Event "
 718                                        "occurred:\n", dev->name);
 719                                init_timer(&p_ch->timer);
 720                                p_ch->timer.function =
 721                                        (void *)claw_write_retry;
 722                                p_ch->timer.data = (unsigned long)p_ch;
 723                                p_ch->timer.expires = jiffies + 10*HZ;
 724                                add_timer(&p_ch->timer);
 725                                dev_info(&cdev->dev,
 726                                        "%s: write connection "
 727                                        "restarting\n", dev->name);
 728                        }
 729                        CLAW_DBF_TEXT(4, trace, "rstrtwrt");
 730                        return;
 731                }
 732                if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
 733                        clear_bit(0, (void *)&p_ch->IO_active);
 734                        dev_info(&cdev->dev,
 735                                "%s: Unit Exception "
 736                                "occurred in write channel\n",
 737                                dev->name);
 738                }
 739                if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
 740                (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
 741                (p_ch->irb->scsw.cmd.stctl ==
 742                (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
 743                        CLAW_DBF_TEXT(4, trace, "writeUE");
 744                        return;
 745                }
 746                clear_bit(0, (void *)&p_ch->IO_active);
 747                if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
 748                        claw_write_next(p_ch);
 749                        claw_clearbit_busy(TB_TX, dev);
 750                        claw_clear_busy(dev);
 751                }
 752                p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
 753                if (test_and_set_bit(CLAW_BH_ACTIVE,
 754                        (void *)&p_ch_r->flag_a) == 0)
 755                        tasklet_schedule(&p_ch_r->tasklet);
 756                CLAW_DBF_TEXT(4, trace, "StWtExit");
 757                return;
 758        default:
 759                dev_warn(&cdev->dev,
 760                        "The CLAW device for %s received an unexpected IRQ\n",
 761                         dev->name);
 762                CLAW_DBF_TEXT(2, trace, "badIRQ");
 763                return;
 764        }
 765
 766}       /*   end of claw_irq_handler    */
 767
 768
 769/*-------------------------------------------------------------------*
 770*       claw_irq_tasklet                                             *
 771*                                                                    *
 772*--------------------------------------------------------------------*/
 773static void
 774claw_irq_tasklet ( unsigned long data )
 775{
 776        struct chbk * p_ch;
 777        struct net_device  *dev;
 778
 779        p_ch = (struct chbk *) data;
 780        dev = (struct net_device *)p_ch->ndev;
 781        CLAW_DBF_TEXT(4, trace, "IRQtask");
 782        unpack_read(dev);
 783        clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
 784        CLAW_DBF_TEXT(4, trace, "TskletXt");
 785        return;
 786}       /*    end of claw_irq_bh    */
 787
 788/*-------------------------------------------------------------------*
 789*       claw_release                                                 *
 790*                                                                    *
 791*--------------------------------------------------------------------*/
 792static int
 793claw_release(struct net_device *dev)
 794{
 795        int                rc;
 796        int                i;
 797        unsigned long      saveflags;
 798        unsigned long      parm;
 799        struct claw_privbk *privptr;
 800        DECLARE_WAITQUEUE(wait, current);
 801        struct ccwbk*             p_this_ccw;
 802        struct ccwbk*             p_buf;
 803
 804        if (!dev)
 805                return 0;
 806        privptr = (struct claw_privbk *)dev->ml_priv;
 807        if (!privptr)
 808                return 0;
 809        CLAW_DBF_TEXT(4, trace, "release");
 810        privptr->release_pend=1;
 811        claw_setbit_busy(TB_STOP,dev);
 812        for ( i = 1; i >=0 ;  i--) {
 813                spin_lock_irqsave(
 814                        get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 815             /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
 816                privptr->channel[i].claw_state = CLAW_STOP;
 817                privptr->channel[i].IO_active = 0;
 818                parm = (unsigned long) &privptr->channel[i];
 819                if (i == WRITE_CHANNEL)
 820                        claw_purge_skb_queue(
 821                                &privptr->channel[WRITE_CHANNEL].collect_queue);
 822                rc = ccw_device_halt (privptr->channel[i].cdev, parm);
 823                if (privptr->system_validate_comp==0x00)  /* never opened? */
 824                   init_waitqueue_head(&privptr->channel[i].wait);
 825                add_wait_queue(&privptr->channel[i].wait, &wait);
 826                set_current_state(TASK_INTERRUPTIBLE);
 827                spin_unlock_irqrestore(
 828                        get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
 829                schedule();
 830                remove_wait_queue(&privptr->channel[i].wait, &wait);
 831                if (rc != 0) {
 832                        ccw_check_return_code(privptr->channel[i].cdev, rc);
 833                }
 834        }
 835        if (privptr->pk_skb != NULL) {
 836                dev_kfree_skb_any(privptr->pk_skb);
 837                privptr->pk_skb = NULL;
 838        }
 839        if(privptr->buffs_alloc != 1) {
 840                CLAW_DBF_TEXT(4, trace, "none2fre");
 841                return 0;
 842        }
 843        CLAW_DBF_TEXT(4, trace, "freebufs");
 844        if (privptr->p_buff_ccw != NULL) {
 845                free_pages((unsigned long)privptr->p_buff_ccw,
 846                        (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
 847        }
 848        CLAW_DBF_TEXT(4, trace, "freeread");
 849        if (privptr->p_env->read_size < PAGE_SIZE) {
 850            if (privptr->p_buff_read != NULL) {
 851                free_pages((unsigned long)privptr->p_buff_read,
 852                      (int)pages_to_order_of_mag(privptr->p_buff_read_num));
 853                }
 854        }
 855        else {
 856                p_buf=privptr->p_read_active_first;
 857                while (p_buf!=NULL) {
 858                        free_pages((unsigned long)p_buf->p_buffer,
 859                             (int)pages_to_order_of_mag(
 860                                privptr->p_buff_pages_perread ));
 861                        p_buf=p_buf->next;
 862                }
 863        }
 864         CLAW_DBF_TEXT(4, trace, "freewrit");
 865        if (privptr->p_env->write_size < PAGE_SIZE ) {
 866                free_pages((unsigned long)privptr->p_buff_write,
 867                      (int)pages_to_order_of_mag(privptr->p_buff_write_num));
 868        }
 869        else {
 870                p_buf=privptr->p_write_active_first;
 871                while (p_buf!=NULL) {
 872                        free_pages((unsigned long)p_buf->p_buffer,
 873                              (int)pages_to_order_of_mag(
 874                              privptr->p_buff_pages_perwrite ));
 875                        p_buf=p_buf->next;
 876                }
 877        }
 878         CLAW_DBF_TEXT(4, trace, "clearptr");
 879        privptr->buffs_alloc = 0;
 880        privptr->p_buff_ccw=NULL;
 881        privptr->p_buff_read=NULL;
 882        privptr->p_buff_write=NULL;
 883        privptr->system_validate_comp=0;
 884        privptr->release_pend=0;
 885        /*      Remove any writes that were pending and reset all reads   */
 886        p_this_ccw=privptr->p_read_active_first;
 887        while (p_this_ccw!=NULL) {
 888                p_this_ccw->header.length=0xffff;
 889                p_this_ccw->header.opcode=0xff;
 890                p_this_ccw->header.flag=0x00;
 891                p_this_ccw=p_this_ccw->next;
 892        }
 893
 894        while (privptr->p_write_active_first!=NULL) {
 895                p_this_ccw=privptr->p_write_active_first;
 896                p_this_ccw->header.flag=CLAW_PENDING;
 897                privptr->p_write_active_first=p_this_ccw->next;
 898                p_this_ccw->next=privptr->p_write_free_chain;
 899                privptr->p_write_free_chain=p_this_ccw;
 900                ++privptr->write_free_count;
 901        }
 902        privptr->p_write_active_last=NULL;
 903        privptr->mtc_logical_link = -1;
 904        privptr->mtc_skipping = 1;
 905        privptr->mtc_offset=0;
 906
 907        if (((privptr->channel[READ_CHANNEL].last_dstat |
 908                privptr->channel[WRITE_CHANNEL].last_dstat) &
 909                ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
 910                dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
 911                        "Deactivating %s completed with incorrect"
 912                        " subchannel status "
 913                        "(read %02x, write %02x)\n",
 914                dev->name,
 915                privptr->channel[READ_CHANNEL].last_dstat,
 916                privptr->channel[WRITE_CHANNEL].last_dstat);
 917                 CLAW_DBF_TEXT(2, trace, "badclose");
 918        }
 919        CLAW_DBF_TEXT(4, trace, "rlsexit");
 920        return 0;
 921}      /* end of claw_release     */
 922
 923/*-------------------------------------------------------------------*
 924*       claw_write_retry                                             *
 925*                                                                    *
 926*--------------------------------------------------------------------*/
 927
 928static void
 929claw_write_retry ( struct chbk *p_ch )
 930{
 931
 932        struct net_device  *dev=p_ch->ndev;
 933
 934        CLAW_DBF_TEXT(4, trace, "w_retry");
 935        if (p_ch->claw_state == CLAW_STOP) {
 936                return;
 937        }
 938        claw_strt_out_IO( dev );
 939        CLAW_DBF_TEXT(4, trace, "rtry_xit");
 940        return;
 941}      /* end of claw_write_retry      */
 942
 943
 944/*-------------------------------------------------------------------*
 945*       claw_write_next                                              *
 946*                                                                    *
 947*--------------------------------------------------------------------*/
 948
 949static void
 950claw_write_next ( struct chbk * p_ch )
 951{
 952
 953        struct net_device  *dev;
 954        struct claw_privbk *privptr=NULL;
 955        struct sk_buff *pk_skb;
 956
 957        CLAW_DBF_TEXT(4, trace, "claw_wrt");
 958        if (p_ch->claw_state == CLAW_STOP)
 959                return;
 960        dev = (struct net_device *) p_ch->ndev;
 961        privptr = (struct claw_privbk *) dev->ml_priv;
 962        claw_free_wrt_buf( dev );
 963        if ((privptr->write_free_count > 0) &&
 964            !skb_queue_empty(&p_ch->collect_queue)) {
 965                pk_skb = claw_pack_skb(privptr);
 966                while (pk_skb != NULL) {
 967                        claw_hw_tx(pk_skb, dev, 1);
 968                        if (privptr->write_free_count > 0) {
 969                                pk_skb = claw_pack_skb(privptr);
 970                        } else
 971                                pk_skb = NULL;
 972                }
 973        }
 974        if (privptr->p_write_active_first!=NULL) {
 975                claw_strt_out_IO(dev);
 976        }
 977        return;
 978}      /* end of claw_write_next      */
 979
 980/*-------------------------------------------------------------------*
 981*                                                                    *
 982*       claw_timer                                                   *
 983*--------------------------------------------------------------------*/
 984
 985static void
 986claw_timer ( struct chbk * p_ch )
 987{
 988        CLAW_DBF_TEXT(4, trace, "timer");
 989        p_ch->flag |= CLAW_TIMER;
 990        wake_up(&p_ch->wait);
 991        return;
 992}      /* end of claw_timer  */
 993
 994/*
 995*
 996*       functions
 997*/
 998
 999
1000/*-------------------------------------------------------------------*
1001*                                                                    *
1002*     pages_to_order_of_mag                                          *
1003*                                                                    *
1004*    takes a number of pages from 1 to 512 and returns the           *
1005*    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1006*    of magnitude get_free_pages() has an upper order of 9           *
1007*--------------------------------------------------------------------*/
1008
1009static int
1010pages_to_order_of_mag(int num_of_pages)
1011{
1012        int     order_of_mag=1;         /* assume 2 pages */
1013        int     nump;
1014
1015        CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1016        if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1017        /* 512 pages = 2Meg on 4k page systems */
1018        if (num_of_pages >= 512) {return 9; }
1019        /* we have two or more pages order is at least 1 */
1020        for (nump=2 ;nump <= 512;nump*=2) {
1021          if (num_of_pages <= nump)
1022                  break;
1023          order_of_mag +=1;
1024        }
1025        if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1026        CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1027        return order_of_mag;
1028}
1029
1030/*-------------------------------------------------------------------*
1031*                                                                    *
1032*     add_claw_reads                                                 *
1033*                                                                    *
1034*--------------------------------------------------------------------*/
1035static int
1036add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1037        struct ccwbk* p_last)
1038{
1039        struct claw_privbk *privptr;
1040        struct ccw1  temp_ccw;
1041        struct endccw * p_end;
1042        CLAW_DBF_TEXT(4, trace, "addreads");
1043        privptr = dev->ml_priv;
1044        p_end = privptr->p_end_ccw;
1045
1046        /* first CCW and last CCW contains a new set of read channel programs
1047        *       to apend the running channel programs
1048        */
1049        if ( p_first==NULL) {
1050                CLAW_DBF_TEXT(4, trace, "addexit");
1051                return 0;
1052        }
1053
1054        /* set up ending CCW sequence for this segment */
1055        if (p_end->read1) {
1056                p_end->read1=0x00;    /*  second ending CCW is now active */
1057                /*      reset ending CCWs and setup TIC CCWs              */
1058                p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1059                p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1060                p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1061                p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1062                p_end->read2_nop2.cda=0;
1063                p_end->read2_nop2.count=1;
1064        }
1065        else {
1066                p_end->read1=0x01;  /* first ending CCW is now active */
1067                /*      reset ending CCWs and setup TIC CCWs          */
1068                p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1069                p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1070                p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1071                p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1072                p_end->read1_nop2.cda=0;
1073                p_end->read1_nop2.count=1;
1074        }
1075
1076        if ( privptr-> p_read_active_first ==NULL ) {
1077                privptr->p_read_active_first = p_first;  /*  set new first */
1078                privptr->p_read_active_last  = p_last;   /*  set new last  */
1079        }
1080        else {
1081
1082                /* set up TIC ccw  */
1083                temp_ccw.cda= (__u32)__pa(&p_first->read);
1084                temp_ccw.count=0;
1085                temp_ccw.flags=0;
1086                temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1087
1088
1089                if (p_end->read1) {
1090
1091               /* first set of CCW's is chained to the new read              */
1092               /* chain, so the second set is chained to the active chain.   */
1093               /* Therefore modify the second set to point to the new        */
1094               /* read chain set up TIC CCWs                                 */
1095               /* make sure we update the CCW so channel doesn't fetch it    */
1096               /* when it's only half done                                   */
1097                        memcpy( &p_end->read2_nop2, &temp_ccw ,
1098                                sizeof(struct ccw1));
1099                        privptr->p_read_active_last->r_TIC_1.cda=
1100                                (__u32)__pa(&p_first->read);
1101                        privptr->p_read_active_last->r_TIC_2.cda=
1102                                (__u32)__pa(&p_first->read);
1103                }
1104                else {
1105                        /* make sure we update the CCW so channel doesn't   */
1106                        /* fetch it when it is only half done               */
1107                        memcpy( &p_end->read1_nop2, &temp_ccw ,
1108                                sizeof(struct ccw1));
1109                        privptr->p_read_active_last->r_TIC_1.cda=
1110                                (__u32)__pa(&p_first->read);
1111                        privptr->p_read_active_last->r_TIC_2.cda=
1112                                (__u32)__pa(&p_first->read);
1113                }
1114                /*      chain in new set of blocks                         */
1115                privptr->p_read_active_last->next = p_first;
1116                privptr->p_read_active_last=p_last;
1117        } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1118        CLAW_DBF_TEXT(4, trace, "addexit");
1119        return 0;
1120}    /*     end of add_claw_reads   */
1121
1122/*-------------------------------------------------------------------*
1123 *   ccw_check_return_code                                           *
1124 *                                                                   *
1125 *-------------------------------------------------------------------*/
1126
1127static void
1128ccw_check_return_code(struct ccw_device *cdev, int return_code)
1129{
1130        CLAW_DBF_TEXT(4, trace, "ccwret");
1131        if (return_code != 0) {
1132                switch (return_code) {
1133                case -EBUSY: /* BUSY is a transient state no action needed */
1134                        break;
1135                case -ENODEV:
1136                        dev_err(&cdev->dev, "The remote channel adapter is not"
1137                                " available\n");
1138                        break;
1139                case -EINVAL:
1140                        dev_err(&cdev->dev,
1141                                "The status of the remote channel adapter"
1142                                " is not valid\n");
1143                        break;
1144                default:
1145                        dev_err(&cdev->dev, "The common device layer"
1146                                " returned error code %d\n",
1147                                  return_code);
1148                }
1149        }
1150        CLAW_DBF_TEXT(4, trace, "ccwret");
1151}    /*    end of ccw_check_return_code   */
1152
1153/*-------------------------------------------------------------------*
1154*       ccw_check_unit_check                                         *
1155*--------------------------------------------------------------------*/
1156
1157static void
1158ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1159{
1160        struct net_device *ndev = p_ch->ndev;
1161        struct device *dev = &p_ch->cdev->dev;
1162
1163        CLAW_DBF_TEXT(4, trace, "unitchek");
1164        dev_warn(dev, "The communication peer of %s disconnected\n",
1165                ndev->name);
1166
1167        if (sense & 0x40) {
1168                if (sense & 0x01) {
1169                        dev_warn(dev, "The remote channel adapter for"
1170                                " %s has been reset\n",
1171                                ndev->name);
1172                }
1173        } else if (sense & 0x20) {
1174                if (sense & 0x04) {
1175                        dev_warn(dev, "A data streaming timeout occurred"
1176                                " for %s\n",
1177                                ndev->name);
1178                } else if (sense & 0x10) {
1179                        dev_warn(dev, "The remote channel adapter for %s"
1180                                " is faulty\n",
1181                                ndev->name);
1182                } else {
1183                        dev_warn(dev, "A data transfer parity error occurred"
1184                                " for %s\n",
1185                                ndev->name);
1186                }
1187        } else if (sense & 0x10) {
1188                dev_warn(dev, "A read data parity error occurred"
1189                        " for %s\n",
1190                        ndev->name);
1191        }
1192
1193}   /*    end of ccw_check_unit_check    */
1194
1195/*-------------------------------------------------------------------*
1196*               find_link                                            *
1197*--------------------------------------------------------------------*/
1198static int
1199find_link(struct net_device *dev, char *host_name, char *ws_name )
1200{
1201        struct claw_privbk *privptr;
1202        struct claw_env *p_env;
1203        int    rc=0;
1204
1205        CLAW_DBF_TEXT(2, setup, "findlink");
1206        privptr = dev->ml_priv;
1207        p_env=privptr->p_env;
1208        switch (p_env->packing)
1209        {
1210                case  PACKING_ASK:
1211                        if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1212                            (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1213                             rc = EINVAL;
1214                        break;
1215                case  DO_PACKED:
1216                case  PACK_SEND:
1217                        if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1218                            (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1219                                rc = EINVAL;
1220                        break;
1221                default:
1222                        if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1223                            (memcmp(p_env->api_type , ws_name, 8)!=0))
1224                                rc = EINVAL;
1225                        break;
1226        }
1227
1228        return rc;
1229}    /*    end of find_link    */
1230
1231/*-------------------------------------------------------------------*
1232 *   claw_hw_tx                                                      *
1233 *                                                                   *
1234 *                                                                   *
1235 *-------------------------------------------------------------------*/
1236
1237static int
1238claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1239{
1240        int                             rc=0;
1241        struct claw_privbk              *privptr;
1242        struct ccwbk           *p_this_ccw;
1243        struct ccwbk           *p_first_ccw;
1244        struct ccwbk           *p_last_ccw;
1245        __u32                           numBuffers;
1246        signed long                     len_of_data;
1247        unsigned long                   bytesInThisBuffer;
1248        unsigned char                   *pDataAddress;
1249        struct endccw                   *pEnd;
1250        struct ccw1                     tempCCW;
1251        struct claw_env                 *p_env;
1252        struct clawph                   *pk_head;
1253        struct chbk                     *ch;
1254
1255        CLAW_DBF_TEXT(4, trace, "hw_tx");
1256        privptr = (struct claw_privbk *)(dev->ml_priv);
1257        p_env =privptr->p_env;
1258        claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1259        /*  scan the write queue to free any completed write packets   */
1260        p_first_ccw=NULL;
1261        p_last_ccw=NULL;
1262        if ((p_env->packing >= PACK_SEND) &&
1263            (skb->cb[1] != 'P')) {
1264                skb_push(skb,sizeof(struct clawph));
1265                pk_head=(struct clawph *)skb->data;
1266                pk_head->len=skb->len-sizeof(struct clawph);
1267                if (pk_head->len%4)  {
1268                        pk_head->len+= 4-(pk_head->len%4);
1269                        skb_pad(skb,4-(pk_head->len%4));
1270                        skb_put(skb,4-(pk_head->len%4));
1271                }
1272                if (p_env->packing == DO_PACKED)
1273                        pk_head->link_num = linkid;
1274                else
1275                        pk_head->link_num = 0;
1276                pk_head->flag = 0x00;
1277                skb_pad(skb,4);
1278                skb->cb[1] = 'P';
1279        }
1280        if (linkid == 0) {
1281                if (claw_check_busy(dev)) {
1282                        if (privptr->write_free_count!=0) {
1283                                claw_clear_busy(dev);
1284                        }
1285                        else {
1286                                claw_strt_out_IO(dev );
1287                                claw_free_wrt_buf( dev );
1288                                if (privptr->write_free_count==0) {
1289                                        ch = &privptr->channel[WRITE_CHANNEL];
1290                                        atomic_inc(&skb->users);
1291                                        skb_queue_tail(&ch->collect_queue, skb);
1292                                        goto Done;
1293                                }
1294                                else {
1295                                        claw_clear_busy(dev);
1296                                }
1297                        }
1298                }
1299                /*  tx lock  */
1300                if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1301                        ch = &privptr->channel[WRITE_CHANNEL];
1302                        atomic_inc(&skb->users);
1303                        skb_queue_tail(&ch->collect_queue, skb);
1304                        claw_strt_out_IO(dev );
1305                        rc=-EBUSY;
1306                        goto Done2;
1307                }
1308        }
1309        /*      See how many write buffers are required to hold this data */
1310        numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1311
1312        /*      If that number of buffers isn't available, give up for now */
1313        if (privptr->write_free_count < numBuffers ||
1314            privptr->p_write_free_chain == NULL ) {
1315
1316                claw_setbit_busy(TB_NOBUFFER,dev);
1317                ch = &privptr->channel[WRITE_CHANNEL];
1318                atomic_inc(&skb->users);
1319                skb_queue_tail(&ch->collect_queue, skb);
1320                CLAW_DBF_TEXT(2, trace, "clawbusy");
1321                goto Done2;
1322        }
1323        pDataAddress=skb->data;
1324        len_of_data=skb->len;
1325
1326        while (len_of_data > 0) {
1327                p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1328                if (p_this_ccw == NULL) { /* lost the race */
1329                        ch = &privptr->channel[WRITE_CHANNEL];
1330                        atomic_inc(&skb->users);
1331                        skb_queue_tail(&ch->collect_queue, skb);
1332                        goto Done2;
1333                }
1334                privptr->p_write_free_chain=p_this_ccw->next;
1335                p_this_ccw->next=NULL;
1336                --privptr->write_free_count; /* -1 */
1337                if (len_of_data >= privptr->p_env->write_size)
1338                        bytesInThisBuffer = privptr->p_env->write_size;
1339                else
1340                        bytesInThisBuffer = len_of_data;
1341                memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1342                len_of_data-=bytesInThisBuffer;
1343                pDataAddress+=(unsigned long)bytesInThisBuffer;
1344                /*      setup write CCW         */
1345                p_this_ccw->write.cmd_code = (linkid * 8) +1;
1346                if (len_of_data>0) {
1347                        p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1348                }
1349                p_this_ccw->write.count=bytesInThisBuffer;
1350                /*      now add to end of this chain    */
1351                if (p_first_ccw==NULL)    {
1352                        p_first_ccw=p_this_ccw;
1353                }
1354                if (p_last_ccw!=NULL) {
1355                        p_last_ccw->next=p_this_ccw;
1356                        /*      set up TIC ccws         */
1357                        p_last_ccw->w_TIC_1.cda=
1358                                (__u32)__pa(&p_this_ccw->write);
1359                }
1360                p_last_ccw=p_this_ccw;      /* save new last block */
1361        }
1362
1363        /*      FirstCCW and LastCCW now contain a new set of write channel
1364        *       programs to append to the running channel program
1365        */
1366
1367        if (p_first_ccw!=NULL) {
1368                /*      setup ending ccw sequence for this segment           */
1369                pEnd=privptr->p_end_ccw;
1370                if (pEnd->write1) {
1371                        pEnd->write1=0x00;   /* second end ccw is now active */
1372                        /*      set up Tic CCWs         */
1373                        p_last_ccw->w_TIC_1.cda=
1374                                (__u32)__pa(&pEnd->write2_nop1);
1375                        pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1376                        pEnd->write2_nop2.flags    =
1377                                CCW_FLAG_SLI | CCW_FLAG_SKIP;
1378                        pEnd->write2_nop2.cda=0;
1379                        pEnd->write2_nop2.count=1;
1380                }
1381                else {  /*  end of if (pEnd->write1)*/
1382                        pEnd->write1=0x01;   /* first end ccw is now active */
1383                        /*      set up Tic CCWs         */
1384                        p_last_ccw->w_TIC_1.cda=
1385                                (__u32)__pa(&pEnd->write1_nop1);
1386                        pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1387                        pEnd->write1_nop2.flags    =
1388                                CCW_FLAG_SLI | CCW_FLAG_SKIP;
1389                        pEnd->write1_nop2.cda=0;
1390                        pEnd->write1_nop2.count=1;
1391                }  /* end if if (pEnd->write1) */
1392
1393                if (privptr->p_write_active_first==NULL ) {
1394                        privptr->p_write_active_first=p_first_ccw;
1395                        privptr->p_write_active_last=p_last_ccw;
1396                }
1397                else {
1398                        /*      set up Tic CCWs         */
1399
1400                        tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1401                        tempCCW.count=0;
1402                        tempCCW.flags=0;
1403                        tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1404
1405                        if (pEnd->write1) {
1406
1407                 /*
1408                 * first set of ending CCW's is chained to the new write
1409                 * chain, so the second set is chained to the active chain
1410                 * Therefore modify the second set to point the new write chain.
1411                 * make sure we update the CCW atomically
1412                 * so channel does not fetch it when it's only half done
1413                 */
1414                                memcpy( &pEnd->write2_nop2, &tempCCW ,
1415                                        sizeof(struct ccw1));
1416                                privptr->p_write_active_last->w_TIC_1.cda=
1417                                        (__u32)__pa(&p_first_ccw->write);
1418                        }
1419                        else {
1420
1421                        /*make sure we update the CCW atomically
1422                         *so channel does not fetch it when it's only half done
1423                         */
1424                                memcpy(&pEnd->write1_nop2, &tempCCW ,
1425                                        sizeof(struct ccw1));
1426                                privptr->p_write_active_last->w_TIC_1.cda=
1427                                        (__u32)__pa(&p_first_ccw->write);
1428
1429                        } /* end if if (pEnd->write1) */
1430
1431                        privptr->p_write_active_last->next=p_first_ccw;
1432                        privptr->p_write_active_last=p_last_ccw;
1433                }
1434
1435        } /* endif (p_first_ccw!=NULL)  */
1436        dev_kfree_skb_any(skb);
1437        claw_strt_out_IO(dev );
1438        /*      if write free count is zero , set NOBUFFER       */
1439        if (privptr->write_free_count==0) {
1440                claw_setbit_busy(TB_NOBUFFER,dev);
1441        }
1442Done2:
1443        claw_clearbit_busy(TB_TX,dev);
1444Done:
1445        return(rc);
1446}    /*    end of claw_hw_tx    */
1447
1448/*-------------------------------------------------------------------*
1449*                                                                    *
1450*     init_ccw_bk                                                    *
1451*                                                                    *
1452*--------------------------------------------------------------------*/
1453
1454static int
1455init_ccw_bk(struct net_device *dev)
1456{
1457
1458        __u32   ccw_blocks_required;
1459        __u32   ccw_blocks_perpage;
1460        __u32   ccw_pages_required;
1461        __u32   claw_reads_perpage=1;
1462        __u32   claw_read_pages;
1463        __u32   claw_writes_perpage=1;
1464        __u32   claw_write_pages;
1465        void    *p_buff=NULL;
1466        struct ccwbk*p_free_chain;
1467        struct ccwbk*p_buf;
1468        struct ccwbk*p_last_CCWB;
1469        struct ccwbk*p_first_CCWB;
1470        struct endccw *p_endccw=NULL;
1471        addr_t  real_address;
1472        struct claw_privbk *privptr = dev->ml_priv;
1473        struct clawh *pClawH=NULL;
1474        addr_t   real_TIC_address;
1475        int i,j;
1476        CLAW_DBF_TEXT(4, trace, "init_ccw");
1477
1478        /*  initialize  statistics field */
1479        privptr->active_link_ID=0;
1480        /*  initialize  ccwbk pointers  */
1481        privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1482        privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1483        privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1484        privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1485        privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1486        privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1487        privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1488        privptr->buffs_alloc = 0;
1489        memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1490        memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1491        /*  initialize  free write ccwbk counter  */
1492        privptr->write_free_count=0;  /* number of free bufs on write chain */
1493        p_last_CCWB = NULL;
1494        p_first_CCWB= NULL;
1495        /*
1496        *  We need 1 CCW block for each read buffer, 1 for each
1497        *  write buffer, plus 1 for ClawSignalBlock
1498        */
1499        ccw_blocks_required =
1500                privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1501        /*
1502        * compute number of CCW blocks that will fit in a page
1503        */
1504        ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1505        ccw_pages_required=
1506                DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1507
1508        /*
1509         *  read and write sizes are set by 2 constants in claw.h
1510         *  4k and 32k.  Unpacked values other than 4k are not going to
1511         * provide good performance. With packing buffers support 32k
1512         * buffers are used.
1513         */
1514        if (privptr->p_env->read_size < PAGE_SIZE) {
1515                claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1516                claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1517                                                claw_reads_perpage);
1518         }
1519         else {       /* > or equal  */
1520                privptr->p_buff_pages_perread =
1521                        DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1522                claw_read_pages = privptr->p_env->read_buffers *
1523                                        privptr->p_buff_pages_perread;
1524         }
1525        if (privptr->p_env->write_size < PAGE_SIZE) {
1526                claw_writes_perpage =
1527                        PAGE_SIZE / privptr->p_env->write_size;
1528                claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1529                                                claw_writes_perpage);
1530
1531        }
1532        else {      /* >  or equal  */
1533                privptr->p_buff_pages_perwrite =
1534                        DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1535                claw_write_pages = privptr->p_env->write_buffers *
1536                                        privptr->p_buff_pages_perwrite;
1537        }
1538        /*
1539        *               allocate ccw_pages_required
1540        */
1541        if (privptr->p_buff_ccw==NULL) {
1542                privptr->p_buff_ccw=
1543                        (void *)__get_free_pages(__GFP_DMA,
1544                        (int)pages_to_order_of_mag(ccw_pages_required ));
1545                if (privptr->p_buff_ccw==NULL) {
1546                        return -ENOMEM;
1547                }
1548                privptr->p_buff_ccw_num=ccw_pages_required;
1549        }
1550        memset(privptr->p_buff_ccw, 0x00,
1551                privptr->p_buff_ccw_num * PAGE_SIZE);
1552
1553        /*
1554        *               obtain ending ccw block address
1555        *
1556        */
1557        privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1558        real_address  = (__u32)__pa(privptr->p_end_ccw);
1559        /*                              Initialize ending CCW block       */
1560        p_endccw=privptr->p_end_ccw;
1561        p_endccw->real=real_address;
1562        p_endccw->write1=0x00;
1563        p_endccw->read1=0x00;
1564
1565        /*      write1_nop1                                     */
1566        p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1567        p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1568        p_endccw->write1_nop1.count       = 1;
1569        p_endccw->write1_nop1.cda         = 0;
1570
1571        /*      write1_nop2                                     */
1572        p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1573        p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1574        p_endccw->write1_nop2.count      = 1;
1575        p_endccw->write1_nop2.cda        = 0;
1576
1577        /*      write2_nop1                                     */
1578        p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1579        p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1580        p_endccw->write2_nop1.count        = 1;
1581        p_endccw->write2_nop1.cda          = 0;
1582
1583        /*      write2_nop2                                     */
1584        p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1585        p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1586        p_endccw->write2_nop2.count        = 1;
1587        p_endccw->write2_nop2.cda          = 0;
1588
1589        /*      read1_nop1                                      */
1590        p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1591        p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1592        p_endccw->read1_nop1.count        = 1;
1593        p_endccw->read1_nop1.cda          = 0;
1594
1595        /*      read1_nop2                                      */
1596        p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1597        p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1598        p_endccw->read1_nop2.count        = 1;
1599        p_endccw->read1_nop2.cda          = 0;
1600
1601        /*      read2_nop1                                      */
1602        p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1603        p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1604        p_endccw->read2_nop1.count        = 1;
1605        p_endccw->read2_nop1.cda          = 0;
1606
1607        /*      read2_nop2                                      */
1608        p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1609        p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1610        p_endccw->read2_nop2.count        = 1;
1611        p_endccw->read2_nop2.cda          = 0;
1612
1613        /*
1614        *                               Build a chain of CCWs
1615        *
1616        */
1617        p_buff=privptr->p_buff_ccw;
1618
1619        p_free_chain=NULL;
1620        for (i=0 ; i < ccw_pages_required; i++ ) {
1621                real_address  = (__u32)__pa(p_buff);
1622                p_buf=p_buff;
1623                for (j=0 ; j < ccw_blocks_perpage ; j++) {
1624                        p_buf->next  = p_free_chain;
1625                        p_free_chain = p_buf;
1626                        p_buf->real=(__u32)__pa(p_buf);
1627                        ++p_buf;
1628                }
1629                p_buff+=PAGE_SIZE;
1630        }
1631        /*
1632        *                               Initialize ClawSignalBlock
1633        *
1634        */
1635        if (privptr->p_claw_signal_blk==NULL) {
1636                privptr->p_claw_signal_blk=p_free_chain;
1637                p_free_chain=p_free_chain->next;
1638                pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1639                pClawH->length=0xffff;
1640                pClawH->opcode=0xff;
1641                pClawH->flag=CLAW_BUSY;
1642        }
1643
1644        /*
1645        *               allocate write_pages_required and add to free chain
1646        */
1647        if (privptr->p_buff_write==NULL) {
1648            if (privptr->p_env->write_size < PAGE_SIZE) {
1649                privptr->p_buff_write=
1650                        (void *)__get_free_pages(__GFP_DMA,
1651                        (int)pages_to_order_of_mag(claw_write_pages ));
1652                if (privptr->p_buff_write==NULL) {
1653                        privptr->p_buff_ccw=NULL;
1654                        return -ENOMEM;
1655                }
1656                /*
1657                *                               Build CLAW write free chain
1658                *
1659                */
1660
1661                memset(privptr->p_buff_write, 0x00,
1662                        ccw_pages_required * PAGE_SIZE);
1663                privptr->p_write_free_chain=NULL;
1664
1665                p_buff=privptr->p_buff_write;
1666
1667                for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1668                        p_buf        = p_free_chain;      /*  get a CCW */
1669                        p_free_chain = p_buf->next;
1670                        p_buf->next  =privptr->p_write_free_chain;
1671                        privptr->p_write_free_chain = p_buf;
1672                        p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1673                        p_buf-> write.cda       = (__u32)__pa(p_buff);
1674                        p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1675                        p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1676                        p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1677                        p_buf-> w_read_FF.count   = 1;
1678                        p_buf-> w_read_FF.cda     =
1679                                (__u32)__pa(&p_buf-> header.flag);
1680                        p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1681                        p_buf-> w_TIC_1.flags      = 0;
1682                        p_buf-> w_TIC_1.count      = 0;
1683
1684                        if (((unsigned long)p_buff +
1685                                            privptr->p_env->write_size) >=
1686                           ((unsigned long)(p_buff+2*
1687                            (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1688                                p_buff = p_buff+privptr->p_env->write_size;
1689                        }
1690                }
1691           }
1692           else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1693           {
1694               privptr->p_write_free_chain=NULL;
1695               for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1696                   p_buff=(void *)__get_free_pages(__GFP_DMA,
1697                        (int)pages_to_order_of_mag(
1698                        privptr->p_buff_pages_perwrite) );
1699                   if (p_buff==NULL) {
1700                        free_pages((unsigned long)privptr->p_buff_ccw,
1701                              (int)pages_to_order_of_mag(
1702                                        privptr->p_buff_ccw_num));
1703                        privptr->p_buff_ccw=NULL;
1704                        p_buf=privptr->p_buff_write;
1705                        while (p_buf!=NULL) {
1706                                free_pages((unsigned long)
1707                                        p_buf->p_buffer,
1708                                        (int)pages_to_order_of_mag(
1709                                        privptr->p_buff_pages_perwrite));
1710                                p_buf=p_buf->next;
1711                        }
1712                        return -ENOMEM;
1713                   }  /* Error on get_pages   */
1714                   memset(p_buff, 0x00, privptr->p_env->write_size );
1715                   p_buf         = p_free_chain;
1716                   p_free_chain  = p_buf->next;
1717                   p_buf->next   = privptr->p_write_free_chain;
1718                   privptr->p_write_free_chain = p_buf;
1719                   privptr->p_buff_write = p_buf;
1720                   p_buf->p_buffer=(struct clawbuf *)p_buff;
1721                   p_buf-> write.cda     = (__u32)__pa(p_buff);
1722                   p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1723                   p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1724                   p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1725                   p_buf-> w_read_FF.count    = 1;
1726                   p_buf-> w_read_FF.cda      =
1727                        (__u32)__pa(&p_buf-> header.flag);
1728                   p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1729                   p_buf-> w_TIC_1.flags   = 0;
1730                   p_buf-> w_TIC_1.count   = 0;
1731               }  /* for all write_buffers   */
1732
1733           }    /* else buffers are PAGE_SIZE or bigger */
1734
1735        }
1736        privptr->p_buff_write_num=claw_write_pages;
1737        privptr->write_free_count=privptr->p_env->write_buffers;
1738
1739
1740        /*
1741        *               allocate read_pages_required and chain to free chain
1742        */
1743        if (privptr->p_buff_read==NULL) {
1744            if (privptr->p_env->read_size < PAGE_SIZE)  {
1745                privptr->p_buff_read=
1746                        (void *)__get_free_pages(__GFP_DMA,
1747                        (int)pages_to_order_of_mag(claw_read_pages) );
1748                if (privptr->p_buff_read==NULL) {
1749                        free_pages((unsigned long)privptr->p_buff_ccw,
1750                                (int)pages_to_order_of_mag(
1751                                        privptr->p_buff_ccw_num));
1752                        /* free the write pages size is < page size  */
1753                        free_pages((unsigned long)privptr->p_buff_write,
1754                                (int)pages_to_order_of_mag(
1755                                privptr->p_buff_write_num));
1756                        privptr->p_buff_ccw=NULL;
1757                        privptr->p_buff_write=NULL;
1758                        return -ENOMEM;
1759                }
1760                memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1761                privptr->p_buff_read_num=claw_read_pages;
1762                /*
1763                *                               Build CLAW read free chain
1764                *
1765                */
1766                p_buff=privptr->p_buff_read;
1767                for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1768                        p_buf        = p_free_chain;
1769                        p_free_chain = p_buf->next;
1770
1771                        if (p_last_CCWB==NULL) {
1772                                p_buf->next=NULL;
1773                                real_TIC_address=0;
1774                                p_last_CCWB=p_buf;
1775                        }
1776                        else {
1777                                p_buf->next=p_first_CCWB;
1778                                real_TIC_address=
1779                                (__u32)__pa(&p_first_CCWB -> read );
1780                        }
1781
1782                        p_first_CCWB=p_buf;
1783
1784                        p_buf->p_buffer=(struct clawbuf *)p_buff;
1785                        /*  initialize read command */
1786                        p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1787                        p_buf-> read.cda = (__u32)__pa(p_buff);
1788                        p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1789                        p_buf-> read.count       = privptr->p_env->read_size;
1790
1791                        /*  initialize read_h command */
1792                        p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1793                        p_buf-> read_h.cda =
1794                                (__u32)__pa(&(p_buf->header));
1795                        p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1796                        p_buf-> read_h.count      = sizeof(struct clawh);
1797
1798                        /*  initialize Signal command */
1799                        p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1800                        p_buf-> signal.cda =
1801                                (__u32)__pa(&(pClawH->flag));
1802                        p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1803                        p_buf-> signal.count     = 1;
1804
1805                        /*  initialize r_TIC_1 command */
1806                        p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1807                        p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1808                        p_buf-> r_TIC_1.flags = 0;
1809                        p_buf-> r_TIC_1.count      = 0;
1810
1811                        /*  initialize r_read_FF command */
1812                        p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1813                        p_buf-> r_read_FF.cda =
1814                                (__u32)__pa(&(pClawH->flag));
1815                        p_buf-> r_read_FF.flags =
1816                                CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1817                        p_buf-> r_read_FF.count    = 1;
1818
1819                        /*    initialize r_TIC_2          */
1820                        memcpy(&p_buf->r_TIC_2,
1821                                &p_buf->r_TIC_1, sizeof(struct ccw1));
1822
1823                        /*     initialize Header     */
1824                        p_buf->header.length=0xffff;
1825                        p_buf->header.opcode=0xff;
1826                        p_buf->header.flag=CLAW_PENDING;
1827
1828                        if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1829                          ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1830                                 -1)
1831                           & PAGE_MASK)) {
1832                                p_buff= p_buff+privptr->p_env->read_size;
1833                        }
1834                        else {
1835                                p_buff=
1836                                (void *)((unsigned long)
1837                                        (p_buff+2*(privptr->p_env->read_size)-1)
1838                                         & PAGE_MASK) ;
1839                        }
1840                }   /* for read_buffers   */
1841          }         /* read_size < PAGE_SIZE  */
1842          else {  /* read Size >= PAGE_SIZE  */
1843                for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1844                        p_buff = (void *)__get_free_pages(__GFP_DMA,
1845                                (int)pages_to_order_of_mag(
1846                                        privptr->p_buff_pages_perread));
1847                        if (p_buff==NULL) {
1848                                free_pages((unsigned long)privptr->p_buff_ccw,
1849                                        (int)pages_to_order_of_mag(privptr->
1850                                        p_buff_ccw_num));
1851                                /* free the write pages  */
1852                                p_buf=privptr->p_buff_write;
1853                                while (p_buf!=NULL) {
1854                                        free_pages(
1855                                            (unsigned long)p_buf->p_buffer,
1856                                            (int)pages_to_order_of_mag(
1857                                            privptr->p_buff_pages_perwrite));
1858                                        p_buf=p_buf->next;
1859                                }
1860                                /* free any read pages already alloc  */
1861                                p_buf=privptr->p_buff_read;
1862                                while (p_buf!=NULL) {
1863                                        free_pages(
1864                                            (unsigned long)p_buf->p_buffer,
1865                                            (int)pages_to_order_of_mag(
1866                                             privptr->p_buff_pages_perread));
1867                                        p_buf=p_buf->next;
1868                                }
1869                                privptr->p_buff_ccw=NULL;
1870                                privptr->p_buff_write=NULL;
1871                                return -ENOMEM;
1872                        }
1873                        memset(p_buff, 0x00, privptr->p_env->read_size);
1874                        p_buf        = p_free_chain;
1875                        privptr->p_buff_read = p_buf;
1876                        p_free_chain = p_buf->next;
1877
1878                        if (p_last_CCWB==NULL) {
1879                                p_buf->next=NULL;
1880                                real_TIC_address=0;
1881                                p_last_CCWB=p_buf;
1882                        }
1883                        else {
1884                                p_buf->next=p_first_CCWB;
1885                                real_TIC_address=
1886                                        (addr_t)__pa(
1887                                                &p_first_CCWB -> read );
1888                        }
1889
1890                        p_first_CCWB=p_buf;
1891                                /* save buff address */
1892                        p_buf->p_buffer=(struct clawbuf *)p_buff;
1893                        /*  initialize read command */
1894                        p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1895                        p_buf-> read.cda = (__u32)__pa(p_buff);
1896                        p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1897                        p_buf-> read.count       = privptr->p_env->read_size;
1898
1899                        /*  initialize read_h command */
1900                        p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1901                        p_buf-> read_h.cda =
1902                                (__u32)__pa(&(p_buf->header));
1903                        p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1904                        p_buf-> read_h.count      = sizeof(struct clawh);
1905
1906                        /*  initialize Signal command */
1907                        p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1908                        p_buf-> signal.cda =
1909                                (__u32)__pa(&(pClawH->flag));
1910                        p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1911                        p_buf-> signal.count     = 1;
1912
1913                        /*  initialize r_TIC_1 command */
1914                        p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1915                        p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1916                        p_buf-> r_TIC_1.flags = 0;
1917                        p_buf-> r_TIC_1.count      = 0;
1918
1919                        /*  initialize r_read_FF command */
1920                        p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1921                        p_buf-> r_read_FF.cda =
1922                                (__u32)__pa(&(pClawH->flag));
1923                        p_buf-> r_read_FF.flags =
1924                                CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1925                        p_buf-> r_read_FF.count    = 1;
1926
1927                        /*    initialize r_TIC_2          */
1928                        memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1929                                sizeof(struct ccw1));
1930
1931                        /*     initialize Header     */
1932                        p_buf->header.length=0xffff;
1933                        p_buf->header.opcode=0xff;
1934                        p_buf->header.flag=CLAW_PENDING;
1935
1936                }    /* For read_buffers   */
1937          }     /*  read_size >= PAGE_SIZE   */
1938        }       /*  pBuffread = NULL */
1939        add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1940        privptr->buffs_alloc = 1;
1941
1942        return 0;
1943}    /*    end of init_ccw_bk */
1944
1945/*-------------------------------------------------------------------*
1946*                                                                    *
1947*       probe_error                                                  *
1948*                                                                    *
1949*--------------------------------------------------------------------*/
1950
1951static void
1952probe_error( struct ccwgroup_device *cgdev)
1953{
1954        struct claw_privbk *privptr;
1955
1956        CLAW_DBF_TEXT(4, trace, "proberr");
1957        privptr = dev_get_drvdata(&cgdev->dev);
1958        if (privptr != NULL) {
1959                dev_set_drvdata(&cgdev->dev, NULL);
1960                kfree(privptr->p_env);
1961                kfree(privptr->p_mtc_envelope);
1962                kfree(privptr);
1963        }
1964}    /*    probe_error    */
1965
1966/*-------------------------------------------------------------------*
1967*    claw_process_control                                            *
1968*                                                                    *
1969*                                                                    *
1970*--------------------------------------------------------------------*/
1971
1972static int
1973claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1974{
1975
1976        struct clawbuf *p_buf;
1977        struct clawctl  ctlbk;
1978        struct clawctl *p_ctlbk;
1979        char    temp_host_name[8];
1980        char    temp_ws_name[8];
1981        struct claw_privbk *privptr;
1982        struct claw_env *p_env;
1983        struct sysval *p_sysval;
1984        struct conncmd *p_connect=NULL;
1985        int rc;
1986        struct chbk *p_ch = NULL;
1987        struct device *tdev;
1988        CLAW_DBF_TEXT(2, setup, "clw_cntl");
1989        udelay(1000);  /* Wait a ms for the control packets to
1990                        *catch up to each other */
1991        privptr = dev->ml_priv;
1992        p_env=privptr->p_env;
1993        tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
1994        memcpy( &temp_host_name, p_env->host_name, 8);
1995        memcpy( &temp_ws_name, p_env->adapter_name , 8);
1996        dev_info(tdev, "%s: CLAW device %.8s: "
1997                "Received Control Packet\n",
1998                dev->name, temp_ws_name);
1999        if (privptr->release_pend==1) {
2000                return 0;
2001        }
2002        p_buf=p_ccw->p_buffer;
2003        p_ctlbk=&ctlbk;
2004        if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2005                memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2006        } else {
2007                memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2008        }
2009        switch (p_ctlbk->command)
2010        {
2011        case SYSTEM_VALIDATE_REQUEST:
2012                if (p_ctlbk->version != CLAW_VERSION_ID) {
2013                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2014                                CLAW_RC_WRONG_VERSION);
2015                        dev_warn(tdev, "The communication peer of %s"
2016                                " uses an incorrect API version %d\n",
2017                                dev->name, p_ctlbk->version);
2018                }
2019                p_sysval = (struct sysval *)&(p_ctlbk->data);
2020                dev_info(tdev, "%s: Recv Sys Validate Request: "
2021                        "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2022                        "Host name=%.8s\n",
2023                        dev->name, p_ctlbk->version,
2024                        p_ctlbk->linkid,
2025                        p_ctlbk->correlator,
2026                        p_sysval->WS_name,
2027                        p_sysval->host_name);
2028                if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2029                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2030                                CLAW_RC_NAME_MISMATCH);
2031                        CLAW_DBF_TEXT(2, setup, "HSTBAD");
2032                        CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2033                        CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2034                        dev_warn(tdev,
2035                                "Host name %s for %s does not match the"
2036                                " remote adapter name %s\n",
2037                                p_sysval->host_name,
2038                                dev->name,
2039                                temp_host_name);
2040                }
2041                if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2042                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2043                                CLAW_RC_NAME_MISMATCH);
2044                        CLAW_DBF_TEXT(2, setup, "WSNBAD");
2045                        CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2046                        CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2047                        dev_warn(tdev, "Adapter name %s for %s does not match"
2048                                " the remote host name %s\n",
2049                                p_sysval->WS_name,
2050                                dev->name,
2051                                temp_ws_name);
2052                }
2053                if ((p_sysval->write_frame_size < p_env->write_size) &&
2054                    (p_env->packing == 0)) {
2055                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2056                                CLAW_RC_HOST_RCV_TOO_SMALL);
2057                        dev_warn(tdev,
2058                                "The local write buffer is smaller than the"
2059                                " remote read buffer\n");
2060                        CLAW_DBF_TEXT(2, setup, "wrtszbad");
2061                }
2062                if ((p_sysval->read_frame_size < p_env->read_size) &&
2063                    (p_env->packing == 0)) {
2064                        claw_snd_sys_validate_rsp(dev, p_ctlbk,
2065                                CLAW_RC_HOST_RCV_TOO_SMALL);
2066                        dev_warn(tdev,
2067                                "The local read buffer is smaller than the"
2068                                " remote write buffer\n");
2069                        CLAW_DBF_TEXT(2, setup, "rdsizbad");
2070                }
2071                claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2072                dev_info(tdev,
2073                        "CLAW device %.8s: System validate"
2074                        " completed.\n", temp_ws_name);
2075                dev_info(tdev,
2076                        "%s: sys Validate Rsize:%d Wsize:%d\n",
2077                        dev->name, p_sysval->read_frame_size,
2078                        p_sysval->write_frame_size);
2079                privptr->system_validate_comp = 1;
2080                if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2081                        p_env->packing = PACKING_ASK;
2082                claw_strt_conn_req(dev);
2083                break;
2084        case SYSTEM_VALIDATE_RESPONSE:
2085                p_sysval = (struct sysval *)&(p_ctlbk->data);
2086                dev_info(tdev,
2087                        "Settings for %s validated (version=%d, "
2088                        "remote device=%d, rc=%d, adapter name=%.8s, "
2089                        "host name=%.8s)\n",
2090                        dev->name,
2091                        p_ctlbk->version,
2092                        p_ctlbk->correlator,
2093                        p_ctlbk->rc,
2094                        p_sysval->WS_name,
2095                        p_sysval->host_name);
2096                switch (p_ctlbk->rc) {
2097                case 0:
2098                        dev_info(tdev, "%s: CLAW device "
2099                                "%.8s: System validate completed.\n",
2100                                dev->name, temp_ws_name);
2101                        if (privptr->system_validate_comp == 0)
2102                                claw_strt_conn_req(dev);
2103                        privptr->system_validate_comp = 1;
2104                        break;
2105                case CLAW_RC_NAME_MISMATCH:
2106                        dev_warn(tdev, "Validating %s failed because of"
2107                                " a host or adapter name mismatch\n",
2108                                dev->name);
2109                        break;
2110                case CLAW_RC_WRONG_VERSION:
2111                        dev_warn(tdev, "Validating %s failed because of a"
2112                                " version conflict\n",
2113                                dev->name);
2114                        break;
2115                case CLAW_RC_HOST_RCV_TOO_SMALL:
2116                        dev_warn(tdev, "Validating %s failed because of a"
2117                                " frame size conflict\n",
2118                                dev->name);
2119                        break;
2120                default:
2121                        dev_warn(tdev, "The communication peer of %s rejected"
2122                                " the connection\n",
2123                                 dev->name);
2124                        break;
2125                }
2126                break;
2127
2128        case CONNECTION_REQUEST:
2129                p_connect = (struct conncmd *)&(p_ctlbk->data);
2130                dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2131                        "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2132                        dev->name,
2133                        p_ctlbk->version,
2134                        p_ctlbk->linkid,
2135                        p_ctlbk->correlator,
2136                        p_connect->host_name,
2137                        p_connect->WS_name);
2138                if (privptr->active_link_ID != 0) {
2139                        claw_snd_disc(dev, p_ctlbk);
2140                        dev_info(tdev, "%s rejected a connection request"
2141                                " because it is already active\n",
2142                                dev->name);
2143                }
2144                if (p_ctlbk->linkid != 1) {
2145                        claw_snd_disc(dev, p_ctlbk);
2146                        dev_info(tdev, "%s rejected a request to open multiple"
2147                                " connections\n",
2148                                dev->name);
2149                }
2150                rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2151                if (rc != 0) {
2152                        claw_snd_disc(dev, p_ctlbk);
2153                        dev_info(tdev, "%s rejected a connection request"
2154                                " because of a type mismatch\n",
2155                                dev->name);
2156                }
2157                claw_send_control(dev,
2158                        CONNECTION_CONFIRM, p_ctlbk->linkid,
2159                        p_ctlbk->correlator,
2160                        0, p_connect->host_name,
2161                        p_connect->WS_name);
2162                if (p_env->packing == PACKING_ASK) {
2163                        p_env->packing = PACK_SEND;
2164                        claw_snd_conn_req(dev, 0);
2165                }
2166                dev_info(tdev, "%s: CLAW device %.8s: Connection "
2167                        "completed link_id=%d.\n",
2168                        dev->name, temp_ws_name,
2169                        p_ctlbk->linkid);
2170                        privptr->active_link_ID = p_ctlbk->linkid;
2171                        p_ch = &privptr->channel[WRITE_CHANNEL];
2172                        wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2173                break;
2174        case CONNECTION_RESPONSE:
2175                p_connect = (struct conncmd *)&(p_ctlbk->data);
2176                dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2177                        "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2178                        dev->name,
2179                        p_ctlbk->version,
2180                        p_ctlbk->linkid,
2181                        p_ctlbk->correlator,
2182                        p_ctlbk->rc,
2183                        p_connect->host_name,
2184                        p_connect->WS_name);
2185
2186                if (p_ctlbk->rc != 0) {
2187                        dev_warn(tdev, "The communication peer of %s rejected"
2188                                " a connection request\n",
2189                                dev->name);
2190                        return 1;
2191                }
2192                rc = find_link(dev,
2193                        p_connect->host_name, p_connect->WS_name);
2194                if (rc != 0) {
2195                        claw_snd_disc(dev, p_ctlbk);
2196                        dev_warn(tdev, "The communication peer of %s"
2197                                " rejected a connection "
2198                                "request because of a type mismatch\n",
2199                                 dev->name);
2200                }
2201                /* should be until CONNECTION_CONFIRM */
2202                privptr->active_link_ID = -(p_ctlbk->linkid);
2203                break;
2204        case CONNECTION_CONFIRM:
2205                p_connect = (struct conncmd *)&(p_ctlbk->data);
2206                dev_info(tdev,
2207                        "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2208                        "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2209                        dev->name,
2210                        p_ctlbk->version,
2211                        p_ctlbk->linkid,
2212                        p_ctlbk->correlator,
2213                        p_connect->host_name,
2214                        p_connect->WS_name);
2215                if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2216                        privptr->active_link_ID = p_ctlbk->linkid;
2217                        if (p_env->packing > PACKING_ASK) {
2218                                dev_info(tdev,
2219                                "%s: Confirmed Now packing\n", dev->name);
2220                                p_env->packing = DO_PACKED;
2221                        }
2222                        p_ch = &privptr->channel[WRITE_CHANNEL];
2223                        wake_up(&p_ch->wait);
2224                } else {
2225                        dev_warn(tdev, "Activating %s failed because of"
2226                                " an incorrect link ID=%d\n",
2227                                dev->name, p_ctlbk->linkid);
2228                        claw_snd_disc(dev, p_ctlbk);
2229                }
2230                break;
2231        case DISCONNECT:
2232                dev_info(tdev, "%s: Disconnect: "
2233                        "Vers=%d,link_id=%d,Corr=%d\n",
2234                        dev->name, p_ctlbk->version,
2235                        p_ctlbk->linkid, p_ctlbk->correlator);
2236                if ((p_ctlbk->linkid == 2) &&
2237                    (p_env->packing == PACK_SEND)) {
2238                        privptr->active_link_ID = 1;
2239                        p_env->packing = DO_PACKED;
2240                } else
2241                        privptr->active_link_ID = 0;
2242                break;
2243        case CLAW_ERROR:
2244                dev_warn(tdev, "The communication peer of %s failed\n",
2245                        dev->name);
2246                break;
2247        default:
2248                dev_warn(tdev, "The communication peer of %s sent"
2249                        " an unknown command code\n",
2250                        dev->name);
2251                break;
2252        }
2253
2254        return 0;
2255}   /*    end of claw_process_control    */
2256
2257
2258/*-------------------------------------------------------------------*
2259*               claw_send_control                                    *
2260*                                                                    *
2261*--------------------------------------------------------------------*/
2262
2263static int
2264claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2265         __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2266{
2267        struct claw_privbk              *privptr;
2268        struct clawctl                  *p_ctl;
2269        struct sysval                   *p_sysval;
2270        struct conncmd                  *p_connect;
2271        struct sk_buff                  *skb;
2272
2273        CLAW_DBF_TEXT(2, setup, "sndcntl");
2274        privptr = dev->ml_priv;
2275        p_ctl=(struct clawctl *)&privptr->ctl_bk;
2276
2277        p_ctl->command=type;
2278        p_ctl->version=CLAW_VERSION_ID;
2279        p_ctl->linkid=link;
2280        p_ctl->correlator=correlator;
2281        p_ctl->rc=rc;
2282
2283        p_sysval=(struct sysval *)&p_ctl->data;
2284        p_connect=(struct conncmd *)&p_ctl->data;
2285
2286        switch (p_ctl->command) {
2287                case SYSTEM_VALIDATE_REQUEST:
2288                case SYSTEM_VALIDATE_RESPONSE:
2289                        memcpy(&p_sysval->host_name, local_name, 8);
2290                        memcpy(&p_sysval->WS_name, remote_name, 8);
2291                        if (privptr->p_env->packing > 0) {
2292                                p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2293                                p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2294                        } else {
2295                                /* how big is the biggest group of packets */
2296                           p_sysval->read_frame_size =
2297                                privptr->p_env->read_size;
2298                           p_sysval->write_frame_size =
2299                                privptr->p_env->write_size;
2300                        }
2301                        memset(&p_sysval->reserved, 0x00, 4);
2302                        break;
2303                case CONNECTION_REQUEST:
2304                case CONNECTION_RESPONSE:
2305                case CONNECTION_CONFIRM:
2306                case DISCONNECT:
2307                        memcpy(&p_sysval->host_name, local_name, 8);
2308                        memcpy(&p_sysval->WS_name, remote_name, 8);
2309                        if (privptr->p_env->packing > 0) {
2310                        /* How big is the biggest packet */
2311                                p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2312                                p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2313                        } else {
2314                                memset(&p_connect->reserved1, 0x00, 4);
2315                                memset(&p_connect->reserved2, 0x00, 4);
2316                        }
2317                        break;
2318                default:
2319                        break;
2320        }
2321
2322        /*      write Control Record to the device                   */
2323
2324
2325        skb = dev_alloc_skb(sizeof(struct clawctl));
2326        if (!skb) {
2327                return -ENOMEM;
2328        }
2329        memcpy(skb_put(skb, sizeof(struct clawctl)),
2330                p_ctl, sizeof(struct clawctl));
2331        if (privptr->p_env->packing >= PACK_SEND)
2332                claw_hw_tx(skb, dev, 1);
2333        else
2334                claw_hw_tx(skb, dev, 0);
2335        return 0;
2336}  /*   end of claw_send_control  */
2337
2338/*-------------------------------------------------------------------*
2339*               claw_snd_conn_req                                    *
2340*                                                                    *
2341*--------------------------------------------------------------------*/
2342static int
2343claw_snd_conn_req(struct net_device *dev, __u8 link)
2344{
2345        int                rc;
2346        struct claw_privbk *privptr = dev->ml_priv;
2347        struct clawctl     *p_ctl;
2348
2349        CLAW_DBF_TEXT(2, setup, "snd_conn");
2350        rc = 1;
2351        p_ctl=(struct clawctl *)&privptr->ctl_bk;
2352        p_ctl->linkid = link;
2353        if ( privptr->system_validate_comp==0x00 ) {
2354                return rc;
2355        }
2356        if (privptr->p_env->packing == PACKING_ASK )
2357                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2358                        WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2359        if (privptr->p_env->packing == PACK_SEND)  {
2360                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2361                        WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2362        }
2363        if (privptr->p_env->packing == 0)
2364                rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2365                        HOST_APPL_NAME, privptr->p_env->api_type);
2366        return rc;
2367
2368}  /*  end of claw_snd_conn_req */
2369
2370
2371/*-------------------------------------------------------------------*
2372*               claw_snd_disc                                        *
2373*                                                                    *
2374*--------------------------------------------------------------------*/
2375
2376static int
2377claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2378{
2379        int rc;
2380        struct conncmd *  p_connect;
2381
2382        CLAW_DBF_TEXT(2, setup, "snd_dsc");
2383        p_connect=(struct conncmd *)&p_ctl->data;
2384
2385        rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2386                p_ctl->correlator, 0,
2387                p_connect->host_name, p_connect->WS_name);
2388        return rc;
2389}     /*   end of claw_snd_disc    */
2390
2391
2392/*-------------------------------------------------------------------*
2393*               claw_snd_sys_validate_rsp                            *
2394*                                                                    *
2395*--------------------------------------------------------------------*/
2396
2397static int
2398claw_snd_sys_validate_rsp(struct net_device *dev,
2399        struct clawctl *p_ctl, __u32 return_code)
2400{
2401        struct claw_env *  p_env;
2402        struct claw_privbk *privptr;
2403        int    rc;
2404
2405        CLAW_DBF_TEXT(2, setup, "chkresp");
2406        privptr = dev->ml_priv;
2407        p_env=privptr->p_env;
2408        rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2409                p_ctl->linkid,
2410                p_ctl->correlator,
2411                return_code,
2412                p_env->host_name,
2413                p_env->adapter_name  );
2414        return rc;
2415}     /*    end of claw_snd_sys_validate_rsp    */
2416
2417/*-------------------------------------------------------------------*
2418*               claw_strt_conn_req                                   *
2419*                                                                    *
2420*--------------------------------------------------------------------*/
2421
2422static int
2423claw_strt_conn_req(struct net_device *dev )
2424{
2425        int rc;
2426
2427        CLAW_DBF_TEXT(2, setup, "conn_req");
2428        rc=claw_snd_conn_req(dev, 1);
2429        return rc;
2430}    /*   end of claw_strt_conn_req   */
2431
2432
2433
2434/*-------------------------------------------------------------------*
2435 *   claw_stats                                                      *
2436 *-------------------------------------------------------------------*/
2437
2438static struct
2439net_device_stats *claw_stats(struct net_device *dev)
2440{
2441        struct claw_privbk *privptr;
2442
2443        CLAW_DBF_TEXT(4, trace, "stats");
2444        privptr = dev->ml_priv;
2445        return &privptr->stats;
2446}     /*   end of claw_stats   */
2447
2448
2449/*-------------------------------------------------------------------*
2450*       unpack_read                                                  *
2451*                                                                    *
2452*--------------------------------------------------------------------*/
2453static void
2454unpack_read(struct net_device *dev )
2455{
2456        struct sk_buff *skb;
2457        struct claw_privbk *privptr;
2458        struct claw_env    *p_env;
2459        struct ccwbk    *p_this_ccw;
2460        struct ccwbk    *p_first_ccw;
2461        struct ccwbk    *p_last_ccw;
2462        struct clawph   *p_packh;
2463        void            *p_packd;
2464        struct clawctl  *p_ctlrec=NULL;
2465        struct device   *p_dev;
2466
2467        __u32   len_of_data;
2468        __u32   pack_off;
2469        __u8    link_num;
2470        __u8    mtc_this_frm=0;
2471        __u32   bytes_to_mov;
2472        int     i=0;
2473        int     p=0;
2474
2475        CLAW_DBF_TEXT(4, trace, "unpkread");
2476        p_first_ccw=NULL;
2477        p_last_ccw=NULL;
2478        p_packh=NULL;
2479        p_packd=NULL;
2480        privptr = dev->ml_priv;
2481
2482        p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2483        p_env = privptr->p_env;
2484        p_this_ccw=privptr->p_read_active_first;
2485        while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2486                pack_off = 0;
2487                p = 0;
2488                p_this_ccw->header.flag=CLAW_PENDING;
2489                privptr->p_read_active_first=p_this_ccw->next;
2490                p_this_ccw->next=NULL;
2491                p_packh = (struct clawph *)p_this_ccw->p_buffer;
2492                if ((p_env->packing == PACK_SEND) &&
2493                    (p_packh->len == 32)           &&
2494                    (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2495                        p_packh++;  /* peek past pack header */
2496                        p_ctlrec = (struct clawctl *)p_packh;
2497                        p_packh--;  /* un peek */
2498                        if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2499                            (p_ctlrec->command == CONNECTION_CONFIRM))
2500                                p_env->packing = DO_PACKED;
2501                }
2502                if (p_env->packing == DO_PACKED)
2503                        link_num=p_packh->link_num;
2504                else
2505                        link_num=p_this_ccw->header.opcode / 8;
2506                if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2507                        mtc_this_frm=1;
2508                        if (p_this_ccw->header.length!=
2509                                privptr->p_env->read_size ) {
2510                                dev_warn(p_dev,
2511                                        "The communication peer of %s"
2512                                        " sent a faulty"
2513                                        " frame of length %02x\n",
2514                                        dev->name, p_this_ccw->header.length);
2515                        }
2516                }
2517
2518                if (privptr->mtc_skipping) {
2519                        /*
2520                        *   We're in the mode of skipping past a
2521                        *   multi-frame message
2522                        *   that we can't process for some reason or other.
2523                        *   The first frame without the More-To-Come flag is
2524                        *   the last frame of the skipped message.
2525                        */
2526                        /*  in case of More-To-Come not set in this frame */
2527                        if (mtc_this_frm==0) {
2528                                privptr->mtc_skipping=0; /* Ok, the end */
2529                                privptr->mtc_logical_link=-1;
2530                        }
2531                        goto NextFrame;
2532                }
2533
2534                if (link_num==0) {
2535                        claw_process_control(dev, p_this_ccw);
2536                        CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2537                        goto NextFrame;
2538                }
2539unpack_next:
2540                if (p_env->packing == DO_PACKED) {
2541                        if (pack_off > p_env->read_size)
2542                                goto NextFrame;
2543                        p_packd = p_this_ccw->p_buffer+pack_off;
2544                        p_packh = (struct clawph *) p_packd;
2545                        if ((p_packh->len == 0) || /* done with this frame? */
2546                            (p_packh->flag != 0))
2547                                goto NextFrame;
2548                        bytes_to_mov = p_packh->len;
2549                        pack_off += bytes_to_mov+sizeof(struct clawph);
2550                        p++;
2551                } else {
2552                        bytes_to_mov=p_this_ccw->header.length;
2553                }
2554                if (privptr->mtc_logical_link<0) {
2555
2556                /*
2557                *  if More-To-Come is set in this frame then we don't know
2558                *  length of entire message, and hence have to allocate
2559                *  large buffer   */
2560
2561                /*      We are starting a new envelope  */
2562                privptr->mtc_offset=0;
2563                        privptr->mtc_logical_link=link_num;
2564                }
2565
2566                if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2567                        /*      error     */
2568                        privptr->stats.rx_frame_errors++;
2569                        goto NextFrame;
2570                }
2571                if (p_env->packing == DO_PACKED) {
2572                        memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2573                                p_packd+sizeof(struct clawph), bytes_to_mov);
2574
2575                } else  {
2576                        memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2577                                p_this_ccw->p_buffer, bytes_to_mov);
2578                }
2579                if (mtc_this_frm==0) {
2580                        len_of_data=privptr->mtc_offset+bytes_to_mov;
2581                        skb=dev_alloc_skb(len_of_data);
2582                        if (skb) {
2583                                memcpy(skb_put(skb,len_of_data),
2584                                        privptr->p_mtc_envelope,
2585                                        len_of_data);
2586                                skb->dev=dev;
2587                                skb_reset_mac_header(skb);
2588                                skb->protocol=htons(ETH_P_IP);
2589                                skb->ip_summed=CHECKSUM_UNNECESSARY;
2590                                privptr->stats.rx_packets++;
2591                                privptr->stats.rx_bytes+=len_of_data;
2592                                netif_rx(skb);
2593                        }
2594                        else {
2595                                dev_info(p_dev, "Allocating a buffer for"
2596                                        " incoming data failed\n");
2597                                privptr->stats.rx_dropped++;
2598                        }
2599                        privptr->mtc_offset=0;
2600                        privptr->mtc_logical_link=-1;
2601                }
2602                else {
2603                        privptr->mtc_offset+=bytes_to_mov;
2604                }
2605                if (p_env->packing == DO_PACKED)
2606                        goto unpack_next;
2607NextFrame:
2608                /*
2609                *   Remove ThisCCWblock from active read queue, and add it
2610                *   to queue of free blocks to be reused.
2611                */
2612                i++;
2613                p_this_ccw->header.length=0xffff;
2614                p_this_ccw->header.opcode=0xff;
2615                /*
2616                *       add this one to the free queue for later reuse
2617                */
2618                if (p_first_ccw==NULL) {
2619                        p_first_ccw = p_this_ccw;
2620                }
2621                else {
2622                        p_last_ccw->next = p_this_ccw;
2623                }
2624                p_last_ccw = p_this_ccw;
2625                /*
2626                *       chain to next block on active read queue
2627                */
2628                p_this_ccw = privptr->p_read_active_first;
2629                CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2630        } /* end of while */
2631
2632        /*      check validity                  */
2633
2634        CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2635        add_claw_reads(dev, p_first_ccw, p_last_ccw);
2636        claw_strt_read(dev, LOCK_YES);
2637        return;
2638}     /*  end of unpack_read   */
2639
2640/*-------------------------------------------------------------------*
2641*       claw_strt_read                                               *
2642*                                                                    *
2643*--------------------------------------------------------------------*/
2644static void
2645claw_strt_read (struct net_device *dev, int lock )
2646{
2647        int        rc = 0;
2648        __u32      parm;
2649        unsigned long  saveflags = 0;
2650        struct claw_privbk *privptr = dev->ml_priv;
2651        struct ccwbk*p_ccwbk;
2652        struct chbk *p_ch;
2653        struct clawh *p_clawh;
2654        p_ch = &privptr->channel[READ_CHANNEL];
2655
2656        CLAW_DBF_TEXT(4, trace, "StRdNter");
2657        p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2658        p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2659
2660        if ((privptr->p_write_active_first!=NULL &&
2661             privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2662            (privptr->p_read_active_first!=NULL &&
2663             privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2664                p_clawh->flag=CLAW_BUSY;    /* 0xff */
2665        }
2666        if (lock==LOCK_YES) {
2667                spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2668        }
2669        if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2670                CLAW_DBF_TEXT(4, trace, "HotRead");
2671                p_ccwbk=privptr->p_read_active_first;
2672                parm = (unsigned long) p_ch;
2673                rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2674                                       0xff, 0);
2675                if (rc != 0) {
2676                        ccw_check_return_code(p_ch->cdev, rc);
2677                }
2678        }
2679        else {
2680                CLAW_DBF_TEXT(2, trace, "ReadAct");
2681        }
2682
2683        if (lock==LOCK_YES) {
2684                spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2685        }
2686        CLAW_DBF_TEXT(4, trace, "StRdExit");
2687        return;
2688}       /*    end of claw_strt_read    */
2689
2690/*-------------------------------------------------------------------*
2691*       claw_strt_out_IO                                             *
2692*                                                                    *
2693*--------------------------------------------------------------------*/
2694
2695static void
2696claw_strt_out_IO( struct net_device *dev )
2697{
2698        int                     rc = 0;
2699        unsigned long           parm;
2700        struct claw_privbk      *privptr;
2701        struct chbk             *p_ch;
2702        struct ccwbk    *p_first_ccw;
2703
2704        if (!dev) {
2705                return;
2706        }
2707        privptr = (struct claw_privbk *)dev->ml_priv;
2708        p_ch = &privptr->channel[WRITE_CHANNEL];
2709
2710        CLAW_DBF_TEXT(4, trace, "strt_io");
2711        p_first_ccw=privptr->p_write_active_first;
2712
2713        if (p_ch->claw_state == CLAW_STOP)
2714                return;
2715        if (p_first_ccw == NULL) {
2716                return;
2717        }
2718        if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2719                parm = (unsigned long) p_ch;
2720                CLAW_DBF_TEXT(2, trace, "StWrtIO");
2721                rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2722                                      0xff, 0);
2723                if (rc != 0) {
2724                        ccw_check_return_code(p_ch->cdev, rc);
2725                }
2726        }
2727        dev->trans_start = jiffies;
2728        return;
2729}       /*    end of claw_strt_out_IO    */
2730
2731/*-------------------------------------------------------------------*
2732*       Free write buffers                                           *
2733*                                                                    *
2734*--------------------------------------------------------------------*/
2735
2736static void
2737claw_free_wrt_buf( struct net_device *dev )
2738{
2739
2740        struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2741        struct ccwbk*p_this_ccw;
2742        struct ccwbk*p_next_ccw;
2743
2744        CLAW_DBF_TEXT(4, trace, "freewrtb");
2745        /*  scan the write queue to free any completed write packets   */
2746        p_this_ccw=privptr->p_write_active_first;
2747        while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2748        {
2749                p_next_ccw = p_this_ccw->next;
2750                if (((p_next_ccw!=NULL) &&
2751                     (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2752                    ((p_this_ccw == privptr->p_write_active_last) &&
2753                     (p_this_ccw->header.flag!=CLAW_PENDING))) {
2754                        /* The next CCW is OK or this is  */
2755                        /* the last CCW...free it   @A1A  */
2756                        privptr->p_write_active_first=p_this_ccw->next;
2757                        p_this_ccw->header.flag=CLAW_PENDING;
2758                        p_this_ccw->next=privptr->p_write_free_chain;
2759                        privptr->p_write_free_chain=p_this_ccw;
2760                        ++privptr->write_free_count;
2761                        privptr->stats.tx_bytes+= p_this_ccw->write.count;
2762                        p_this_ccw=privptr->p_write_active_first;
2763                        privptr->stats.tx_packets++;
2764                }
2765                else {
2766                        break;
2767                }
2768        }
2769        if (privptr->write_free_count!=0) {
2770                claw_clearbit_busy(TB_NOBUFFER,dev);
2771        }
2772        /*   whole chain removed?   */
2773        if (privptr->p_write_active_first==NULL) {
2774                privptr->p_write_active_last=NULL;
2775        }
2776        CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2777        return;
2778}
2779
2780/*-------------------------------------------------------------------*
2781*       claw free netdevice                                          *
2782*                                                                    *
2783*--------------------------------------------------------------------*/
2784static void
2785claw_free_netdevice(struct net_device * dev, int free_dev)
2786{
2787        struct claw_privbk *privptr;
2788
2789        CLAW_DBF_TEXT(2, setup, "free_dev");
2790        if (!dev)
2791                return;
2792        CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2793        privptr = dev->ml_priv;
2794        if (dev->flags & IFF_RUNNING)
2795                claw_release(dev);
2796        if (privptr) {
2797                privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2798        }
2799        dev->ml_priv = NULL;
2800#ifdef MODULE
2801        if (free_dev) {
2802                free_netdev(dev);
2803        }
2804#endif
2805        CLAW_DBF_TEXT(2, setup, "free_ok");
2806}
2807
2808/**
2809 * Claw init netdevice
2810 * Initialize everything of the net device except the name and the
2811 * channel structs.
2812 */
2813static const struct net_device_ops claw_netdev_ops = {
2814        .ndo_open               = claw_open,
2815        .ndo_stop               = claw_release,
2816        .ndo_get_stats          = claw_stats,
2817        .ndo_start_xmit         = claw_tx,
2818        .ndo_change_mtu         = claw_change_mtu,
2819};
2820
2821static void
2822claw_init_netdevice(struct net_device * dev)
2823{
2824        CLAW_DBF_TEXT(2, setup, "init_dev");
2825        CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2826        dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2827        dev->hard_header_len = 0;
2828        dev->addr_len = 0;
2829        dev->type = ARPHRD_SLIP;
2830        dev->tx_queue_len = 1300;
2831        dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2832        dev->netdev_ops = &claw_netdev_ops;
2833        CLAW_DBF_TEXT(2, setup, "initok");
2834        return;
2835}
2836
2837/**
2838 * Init a new channel in the privptr->channel[i].
2839 *
2840 * @param cdev  The ccw_device to be added.
2841 *
2842 * @return 0 on success, !0 on error.
2843 */
2844static int
2845add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2846{
2847        struct chbk *p_ch;
2848        struct ccw_dev_id dev_id;
2849
2850        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2851        privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2852        p_ch = &privptr->channel[i];
2853        p_ch->cdev = cdev;
2854        snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2855        ccw_device_get_id(cdev, &dev_id);
2856        p_ch->devno = dev_id.devno;
2857        if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2858                return -ENOMEM;
2859        }
2860        return 0;
2861}
2862
2863
2864/**
2865 *
2866 * Setup an interface.
2867 *
2868 * @param cgdev  Device to be setup.
2869 *
2870 * @returns 0 on success, !0 on failure.
2871 */
2872static int
2873claw_new_device(struct ccwgroup_device *cgdev)
2874{
2875        struct claw_privbk *privptr;
2876        struct claw_env *p_env;
2877        struct net_device *dev;
2878        int ret;
2879        struct ccw_dev_id dev_id;
2880
2881        dev_info(&cgdev->dev, "add for %s\n",
2882                 dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2883        CLAW_DBF_TEXT(2, setup, "new_dev");
2884        privptr = dev_get_drvdata(&cgdev->dev);
2885        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2886        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2887        if (!privptr)
2888                return -ENODEV;
2889        p_env = privptr->p_env;
2890        ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2891        p_env->devno[READ_CHANNEL] = dev_id.devno;
2892        ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2893        p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2894        ret = add_channel(cgdev->cdev[0],0,privptr);
2895        if (ret == 0)
2896                ret = add_channel(cgdev->cdev[1],1,privptr);
2897        if (ret != 0) {
2898                dev_warn(&cgdev->dev, "Creating a CLAW group device"
2899                        " failed with error code %d\n", ret);
2900                goto out;
2901        }
2902        ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2903        if (ret != 0) {
2904                dev_warn(&cgdev->dev,
2905                        "Setting the read subchannel online"
2906                        " failed with error code %d\n", ret);
2907                goto out;
2908        }
2909        ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2910        if (ret != 0) {
2911                dev_warn(&cgdev->dev,
2912                        "Setting the write subchannel online "
2913                        "failed with error code %d\n", ret);
2914                goto out;
2915        }
2916        dev = alloc_netdev(0, "claw%d", NET_NAME_UNKNOWN, claw_init_netdevice);
2917        if (!dev) {
2918                dev_warn(&cgdev->dev,
2919                        "Activating the CLAW device failed\n");
2920                goto out;
2921        }
2922        dev->ml_priv = privptr;
2923        dev_set_drvdata(&cgdev->dev, privptr);
2924        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2925        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2926        /* sysfs magic */
2927        SET_NETDEV_DEV(dev, &cgdev->dev);
2928        if (register_netdev(dev) != 0) {
2929                claw_free_netdevice(dev, 1);
2930                CLAW_DBF_TEXT(2, trace, "regfail");
2931                goto out;
2932        }
2933        dev->flags &=~IFF_RUNNING;
2934        if (privptr->buffs_alloc == 0) {
2935                ret=init_ccw_bk(dev);
2936                if (ret !=0) {
2937                        unregister_netdev(dev);
2938                        claw_free_netdevice(dev,1);
2939                        CLAW_DBF_TEXT(2, trace, "ccwmem");
2940                        goto out;
2941                }
2942        }
2943        privptr->channel[READ_CHANNEL].ndev = dev;
2944        privptr->channel[WRITE_CHANNEL].ndev = dev;
2945        privptr->p_env->ndev = dev;
2946
2947        dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2948                "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2949                dev->name, p_env->read_size,
2950                p_env->write_size, p_env->read_buffers,
2951                p_env->write_buffers, p_env->devno[READ_CHANNEL],
2952                p_env->devno[WRITE_CHANNEL]);
2953        dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2954                ":%.8s api_type: %.8s\n",
2955                dev->name, p_env->host_name,
2956                p_env->adapter_name , p_env->api_type);
2957        return 0;
2958out:
2959        ccw_device_set_offline(cgdev->cdev[1]);
2960        ccw_device_set_offline(cgdev->cdev[0]);
2961        return -ENODEV;
2962}
2963
2964static void
2965claw_purge_skb_queue(struct sk_buff_head *q)
2966{
2967        struct sk_buff *skb;
2968
2969        CLAW_DBF_TEXT(4, trace, "purgque");
2970        while ((skb = skb_dequeue(q))) {
2971                atomic_dec(&skb->users);
2972                dev_kfree_skb_any(skb);
2973        }
2974}
2975
2976/**
2977 * Shutdown an interface.
2978 *
2979 * @param cgdev  Device to be shut down.
2980 *
2981 * @returns 0 on success, !0 on failure.
2982 */
2983static int
2984claw_shutdown_device(struct ccwgroup_device *cgdev)
2985{
2986        struct claw_privbk *priv;
2987        struct net_device *ndev;
2988        int ret = 0;
2989
2990        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2991        priv = dev_get_drvdata(&cgdev->dev);
2992        if (!priv)
2993                return -ENODEV;
2994        ndev = priv->channel[READ_CHANNEL].ndev;
2995        if (ndev) {
2996                /* Close the device */
2997                dev_info(&cgdev->dev, "%s: shutting down\n",
2998                        ndev->name);
2999                if (ndev->flags & IFF_RUNNING)
3000                        ret = claw_release(ndev);
3001                ndev->flags &=~IFF_RUNNING;
3002                unregister_netdev(ndev);
3003                ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3004                claw_free_netdevice(ndev, 1);
3005                priv->channel[READ_CHANNEL].ndev = NULL;
3006                priv->channel[WRITE_CHANNEL].ndev = NULL;
3007                priv->p_env->ndev = NULL;
3008        }
3009        ccw_device_set_offline(cgdev->cdev[1]);
3010        ccw_device_set_offline(cgdev->cdev[0]);
3011        return ret;
3012}
3013
3014static void
3015claw_remove_device(struct ccwgroup_device *cgdev)
3016{
3017        struct claw_privbk *priv;
3018
3019        CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3020        priv = dev_get_drvdata(&cgdev->dev);
3021        dev_info(&cgdev->dev, " will be removed.\n");
3022        if (cgdev->state == CCWGROUP_ONLINE)
3023                claw_shutdown_device(cgdev);
3024        kfree(priv->p_mtc_envelope);
3025        priv->p_mtc_envelope=NULL;
3026        kfree(priv->p_env);
3027        priv->p_env=NULL;
3028        kfree(priv->channel[0].irb);
3029        priv->channel[0].irb=NULL;
3030        kfree(priv->channel[1].irb);
3031        priv->channel[1].irb=NULL;
3032        kfree(priv);
3033        dev_set_drvdata(&cgdev->dev, NULL);
3034        dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3035        dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3036        put_device(&cgdev->dev);
3037
3038        return;
3039}
3040
3041
3042/*
3043 * sysfs attributes
3044 */
3045static ssize_t
3046claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3047{
3048        struct claw_privbk *priv;
3049        struct claw_env *  p_env;
3050
3051        priv = dev_get_drvdata(dev);
3052        if (!priv)
3053                return -ENODEV;
3054        p_env = priv->p_env;
3055        return sprintf(buf, "%s\n",p_env->host_name);
3056}
3057
3058static ssize_t
3059claw_hname_write(struct device *dev, struct device_attribute *attr,
3060         const char *buf, size_t count)
3061{
3062        struct claw_privbk *priv;
3063        struct claw_env *  p_env;
3064
3065        priv = dev_get_drvdata(dev);
3066        if (!priv)
3067                return -ENODEV;
3068        p_env = priv->p_env;
3069        if (count > MAX_NAME_LEN+1)
3070                return -EINVAL;
3071        memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3072        strncpy(p_env->host_name,buf, count);
3073        p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3074        p_env->host_name[MAX_NAME_LEN] = 0x00;
3075        CLAW_DBF_TEXT(2, setup, "HstnSet");
3076        CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3077
3078        return count;
3079}
3080
3081static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3082
3083static ssize_t
3084claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3085{
3086        struct claw_privbk *priv;
3087        struct claw_env *  p_env;
3088
3089        priv = dev_get_drvdata(dev);
3090        if (!priv)
3091                return -ENODEV;
3092        p_env = priv->p_env;
3093        return sprintf(buf, "%s\n", p_env->adapter_name);
3094}
3095
3096static ssize_t
3097claw_adname_write(struct device *dev, struct device_attribute *attr,
3098         const char *buf, size_t count)
3099{
3100        struct claw_privbk *priv;
3101        struct claw_env *  p_env;
3102
3103        priv = dev_get_drvdata(dev);
3104        if (!priv)
3105                return -ENODEV;
3106        p_env = priv->p_env;
3107        if (count > MAX_NAME_LEN+1)
3108                return -EINVAL;
3109        memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3110        strncpy(p_env->adapter_name,buf, count);
3111        p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3112        p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3113        CLAW_DBF_TEXT(2, setup, "AdnSet");
3114        CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3115
3116        return count;
3117}
3118
3119static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3120
3121static ssize_t
3122claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3123{
3124        struct claw_privbk *priv;
3125        struct claw_env *  p_env;
3126
3127        priv = dev_get_drvdata(dev);
3128        if (!priv)
3129                return -ENODEV;
3130        p_env = priv->p_env;
3131        return sprintf(buf, "%s\n",
3132                       p_env->api_type);
3133}
3134
3135static ssize_t
3136claw_apname_write(struct device *dev, struct device_attribute *attr,
3137        const char *buf, size_t count)
3138{
3139        struct claw_privbk *priv;
3140        struct claw_env *  p_env;
3141
3142        priv = dev_get_drvdata(dev);
3143        if (!priv)
3144                return -ENODEV;
3145        p_env = priv->p_env;
3146        if (count > MAX_NAME_LEN+1)
3147                return -EINVAL;
3148        memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3149        strncpy(p_env->api_type,buf, count);
3150        p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3151        p_env->api_type[MAX_NAME_LEN] = 0x00;
3152        if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3153                p_env->read_size=DEF_PACK_BUFSIZE;
3154                p_env->write_size=DEF_PACK_BUFSIZE;
3155                p_env->packing=PACKING_ASK;
3156                CLAW_DBF_TEXT(2, setup, "PACKING");
3157        }
3158        else {
3159                p_env->packing=0;
3160                p_env->read_size=CLAW_FRAME_SIZE;
3161                p_env->write_size=CLAW_FRAME_SIZE;
3162                CLAW_DBF_TEXT(2, setup, "ApiSet");
3163        }
3164        CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3165        return count;
3166}
3167
3168static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3169
3170static ssize_t
3171claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3172{
3173        struct claw_privbk *priv;
3174        struct claw_env * p_env;
3175
3176        priv = dev_get_drvdata(dev);
3177        if (!priv)
3178                return -ENODEV;
3179        p_env = priv->p_env;
3180        return sprintf(buf, "%d\n", p_env->write_buffers);
3181}
3182
3183static ssize_t
3184claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3185        const char *buf, size_t count)
3186{
3187        struct claw_privbk *priv;
3188        struct claw_env *  p_env;
3189        int nnn,max;
3190
3191        priv = dev_get_drvdata(dev);
3192        if (!priv)
3193                return -ENODEV;
3194        p_env = priv->p_env;
3195        sscanf(buf, "%i", &nnn);
3196        if (p_env->packing) {
3197                max = 64;
3198        }
3199        else {
3200                max = 512;
3201        }
3202        if ((nnn > max ) || (nnn < 2))
3203                return -EINVAL;
3204        p_env->write_buffers = nnn;
3205        CLAW_DBF_TEXT(2, setup, "Wbufset");
3206        CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3207        return count;
3208}
3209
3210static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3211
3212static ssize_t
3213claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3214{
3215        struct claw_privbk *priv;
3216        struct claw_env *  p_env;
3217
3218        priv = dev_get_drvdata(dev);
3219        if (!priv)
3220                return -ENODEV;
3221        p_env = priv->p_env;
3222        return sprintf(buf, "%d\n", p_env->read_buffers);
3223}
3224
3225static ssize_t
3226claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3227        const char *buf, size_t count)
3228{
3229        struct claw_privbk *priv;
3230        struct claw_env *p_env;
3231        int nnn,max;
3232
3233        priv = dev_get_drvdata(dev);
3234        if (!priv)
3235                return -ENODEV;
3236        p_env = priv->p_env;
3237        sscanf(buf, "%i", &nnn);
3238        if (p_env->packing) {
3239                max = 64;
3240        }
3241        else {
3242                max = 512;
3243        }
3244        if ((nnn > max ) || (nnn < 2))
3245                return -EINVAL;
3246        p_env->read_buffers = nnn;
3247        CLAW_DBF_TEXT(2, setup, "Rbufset");
3248        CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3249        return count;
3250}
3251static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3252
3253static struct attribute *claw_attr[] = {
3254        &dev_attr_read_buffer.attr,
3255        &dev_attr_write_buffer.attr,
3256        &dev_attr_adapter_name.attr,
3257        &dev_attr_api_type.attr,
3258        &dev_attr_host_name.attr,
3259        NULL,
3260};
3261static struct attribute_group claw_attr_group = {
3262        .attrs = claw_attr,
3263};
3264static const struct attribute_group *claw_attr_groups[] = {
3265        &claw_attr_group,
3266        NULL,
3267};
3268static const struct device_type claw_devtype = {
3269        .name = "claw",
3270        .groups = claw_attr_groups,
3271};
3272
3273/*----------------------------------------------------------------*
3274 *   claw_probe                                                   *
3275 *      this function is called for each CLAW device.             *
3276 *----------------------------------------------------------------*/
3277static int claw_probe(struct ccwgroup_device *cgdev)
3278{
3279        struct claw_privbk *privptr = NULL;
3280
3281        CLAW_DBF_TEXT(2, setup, "probe");
3282        if (!get_device(&cgdev->dev))
3283                return -ENODEV;
3284        privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
3285        dev_set_drvdata(&cgdev->dev, privptr);
3286        if (privptr == NULL) {
3287                probe_error(cgdev);
3288                put_device(&cgdev->dev);
3289                CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3290                return -ENOMEM;
3291        }
3292        privptr->p_mtc_envelope = kzalloc(MAX_ENVELOPE_SIZE, GFP_KERNEL);
3293        privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
3294        if ((privptr->p_mtc_envelope == NULL) || (privptr->p_env == NULL)) {
3295                probe_error(cgdev);
3296                put_device(&cgdev->dev);
3297                CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3298                return -ENOMEM;
3299        }
3300        memcpy(privptr->p_env->adapter_name, WS_NAME_NOT_DEF, 8);
3301        memcpy(privptr->p_env->host_name, WS_NAME_NOT_DEF, 8);
3302        memcpy(privptr->p_env->api_type, WS_NAME_NOT_DEF, 8);
3303        privptr->p_env->packing = 0;
3304        privptr->p_env->write_buffers = 5;
3305        privptr->p_env->read_buffers = 5;
3306        privptr->p_env->read_size = CLAW_FRAME_SIZE;
3307        privptr->p_env->write_size = CLAW_FRAME_SIZE;
3308        privptr->p_env->p_priv = privptr;
3309        cgdev->cdev[0]->handler = claw_irq_handler;
3310        cgdev->cdev[1]->handler = claw_irq_handler;
3311        cgdev->dev.type = &claw_devtype;
3312        CLAW_DBF_TEXT(2, setup, "prbext 0");
3313
3314        return 0;
3315}  /*  end of claw_probe       */
3316
3317/*--------------------------------------------------------------------*
3318*    claw_init  and cleanup                                           *
3319*---------------------------------------------------------------------*/
3320
3321static void __exit claw_cleanup(void)
3322{
3323        ccwgroup_driver_unregister(&claw_group_driver);
3324        ccw_driver_unregister(&claw_ccw_driver);
3325        root_device_unregister(claw_root_dev);
3326        claw_unregister_debug_facility();
3327        pr_info("Driver unloaded\n");
3328}
3329
3330/**
3331 * Initialize module.
3332 * This is called just after the module is loaded.
3333 *
3334 * @return 0 on success, !0 on error.
3335 */
3336static int __init claw_init(void)
3337{
3338        int ret = 0;
3339
3340        pr_info("Loading %s\n", version);
3341        ret = claw_register_debug_facility();
3342        if (ret) {
3343                pr_err("Registering with the S/390 debug feature"
3344                        " failed with error code %d\n", ret);
3345                goto out_err;
3346        }
3347        CLAW_DBF_TEXT(2, setup, "init_mod");
3348        claw_root_dev = root_device_register("claw");
3349        ret = PTR_ERR_OR_ZERO(claw_root_dev);
3350        if (ret)
3351                goto register_err;
3352        ret = ccw_driver_register(&claw_ccw_driver);
3353        if (ret)
3354                goto ccw_err;
3355        claw_group_driver.driver.groups = claw_drv_attr_groups;
3356        ret = ccwgroup_driver_register(&claw_group_driver);
3357        if (ret)
3358                goto ccwgroup_err;
3359        return 0;
3360
3361ccwgroup_err:
3362        ccw_driver_unregister(&claw_ccw_driver);
3363ccw_err:
3364        root_device_unregister(claw_root_dev);
3365register_err:
3366        CLAW_DBF_TEXT(2, setup, "init_bad");
3367        claw_unregister_debug_facility();
3368out_err:
3369        pr_err("Initializing the claw device driver failed\n");
3370        return ret;
3371}
3372
3373module_init(claw_init);
3374module_exit(claw_cleanup);
3375
3376MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3377MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3378                        "Copyright IBM Corp. 2000, 2008\n");
3379MODULE_LICENSE("GPL");
3380
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