Version:  2.0.40 2.2.26 2.4.37 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0

Linux/drivers/s390/net/claw.c

  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 
 98 static char version[] __initdata = "CLAW driver";
 99 static char debug_buffer[255];
100 /**
101  * Debug Facility Stuff
102  */
103 static debug_info_t *claw_dbf_setup;
104 static debug_info_t *claw_dbf_trace;
105 
106 /**
107  *  CLAW Debug Facility functions
108  */
109 static void
110 claw_unregister_debug_facility(void)
111 {
112         debug_unregister(claw_dbf_setup);
113         debug_unregister(claw_dbf_trace);
114 }
115 
116 static int
117 claw_register_debug_facility(void)
118 {
119         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
120         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
121         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
122                 claw_unregister_debug_facility();
123                 return -ENOMEM;
124         }
125         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
126         debug_set_level(claw_dbf_setup, 2);
127         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
128         debug_set_level(claw_dbf_trace, 2);
129         return 0;
130 }
131 
132 static inline void
133 claw_set_busy(struct net_device *dev)
134 {
135  ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
136 }
137 
138 static inline void
139 claw_clear_busy(struct net_device *dev)
140 {
141         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
142         netif_wake_queue(dev);
143 }
144 
145 static inline int
146 claw_check_busy(struct net_device *dev)
147 {
148         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
149 }
150 
151 static inline void
152 claw_setbit_busy(int nr,struct net_device *dev)
153 {
154         netif_stop_queue(dev);
155         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
156 }
157 
158 static inline void
159 claw_clearbit_busy(int nr,struct net_device *dev)
160 {
161         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
162         netif_wake_queue(dev);
163 }
164 
165 static inline int
166 claw_test_and_setbit_busy(int nr,struct net_device *dev)
167 {
168         netif_stop_queue(dev);
169         return test_and_set_bit(nr,
170                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
171 }
172 
173 
174 /* Functions for the DEV methods */
175 
176 static int claw_probe(struct ccwgroup_device *cgdev);
177 static void claw_remove_device(struct ccwgroup_device *cgdev);
178 static void claw_purge_skb_queue(struct sk_buff_head *q);
179 static int claw_new_device(struct ccwgroup_device *cgdev);
180 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
181 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
182 static int claw_change_mtu( struct net_device *dev, int new_mtu);
183 static int claw_open(struct net_device *dev);
184 static void claw_irq_handler(struct ccw_device *cdev,
185         unsigned long intparm, struct irb *irb);
186 static void claw_irq_tasklet ( unsigned long data );
187 static int claw_release(struct net_device *dev);
188 static void claw_write_retry ( struct chbk * p_ch );
189 static void claw_write_next ( struct chbk * p_ch );
190 static void claw_timer ( struct chbk * p_ch );
191 
192 /* Functions */
193 static int add_claw_reads(struct net_device *dev,
194         struct ccwbk* p_first, struct ccwbk* p_last);
195 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
196 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
197 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
198 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
199 static int init_ccw_bk(struct net_device *dev);
200 static void probe_error( struct ccwgroup_device *cgdev);
201 static struct net_device_stats *claw_stats(struct net_device *dev);
202 static int pages_to_order_of_mag(int num_of_pages);
203 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
204 /* sysfs Functions */
205 static ssize_t claw_hname_show(struct device *dev,
206         struct device_attribute *attr, char *buf);
207 static ssize_t claw_hname_write(struct device *dev,
208         struct device_attribute *attr,
209         const char *buf, size_t count);
210 static ssize_t claw_adname_show(struct device *dev,
211         struct device_attribute *attr, char *buf);
212 static ssize_t claw_adname_write(struct device *dev,
213         struct device_attribute *attr,
214         const char *buf, size_t count);
215 static ssize_t claw_apname_show(struct device *dev,
216         struct device_attribute *attr, char *buf);
217 static ssize_t claw_apname_write(struct device *dev,
218         struct device_attribute *attr,
219         const char *buf, size_t count);
220 static ssize_t claw_wbuff_show(struct device *dev,
221         struct device_attribute *attr, char *buf);
222 static ssize_t claw_wbuff_write(struct device *dev,
223         struct device_attribute *attr,
224         const char *buf, size_t count);
225 static ssize_t claw_rbuff_show(struct device *dev,
226         struct device_attribute *attr, char *buf);
227 static ssize_t claw_rbuff_write(struct device *dev,
228         struct device_attribute *attr,
229         const char *buf, size_t count);
230 
231 /*   Functions for System Validate  */
232 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
233 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
234        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
235 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
236 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
237 static int claw_snd_sys_validate_rsp(struct net_device *dev,
238         struct clawctl * p_ctl, __u32 return_code);
239 static int claw_strt_conn_req(struct net_device *dev );
240 static void claw_strt_read(struct net_device *dev, int lock);
241 static void claw_strt_out_IO(struct net_device *dev);
242 static void claw_free_wrt_buf(struct net_device *dev);
243 
244 /* Functions for unpack reads   */
245 static void unpack_read(struct net_device *dev);
246 
247 static int claw_pm_prepare(struct ccwgroup_device *gdev)
248 {
249         return -EPERM;
250 }
251 
252 /* the root device for claw group devices */
253 static struct device *claw_root_dev;
254 
255 /* ccwgroup table  */
256 
257 static struct ccwgroup_driver claw_group_driver = {
258         .driver = {
259                 .owner  = THIS_MODULE,
260                 .name   = "claw",
261         },
262         .setup       = claw_probe,
263         .remove      = claw_remove_device,
264         .set_online  = claw_new_device,
265         .set_offline = claw_shutdown_device,
266         .prepare     = claw_pm_prepare,
267 };
268 
269 static struct ccw_device_id claw_ids[] = {
270         {CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
271         {},
272 };
273 MODULE_DEVICE_TABLE(ccw, claw_ids);
274 
275 static struct ccw_driver claw_ccw_driver = {
276         .driver = {
277                 .owner  = THIS_MODULE,
278                 .name   = "claw",
279         },
280         .ids    = claw_ids,
281         .probe  = ccwgroup_probe_ccwdev,
282         .remove = ccwgroup_remove_ccwdev,
283         .int_class = IRQIO_CLW,
284 };
285 
286 static ssize_t claw_driver_group_store(struct device_driver *ddrv,
287                                        const char *buf, size_t count)
288 {
289         int err;
290         err = ccwgroup_create_dev(claw_root_dev, &claw_group_driver, 2, buf);
291         return err ? err : count;
292 }
293 static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);
294 
295 static struct attribute *claw_drv_attrs[] = {
296         &driver_attr_group.attr,
297         NULL,
298 };
299 static struct attribute_group claw_drv_attr_group = {
300         .attrs = claw_drv_attrs,
301 };
302 static const struct attribute_group *claw_drv_attr_groups[] = {
303         &claw_drv_attr_group,
304         NULL,
305 };
306 
307 /*
308 *       Key functions
309 */
310 
311 /*-------------------------------------------------------------------*
312  *   claw_tx                                                         *
313  *-------------------------------------------------------------------*/
314 
315 static int
316 claw_tx(struct sk_buff *skb, struct net_device *dev)
317 {
318         int             rc;
319         struct claw_privbk *privptr = dev->ml_priv;
320         unsigned long saveflags;
321         struct chbk *p_ch;
322 
323         CLAW_DBF_TEXT(4, trace, "claw_tx");
324         p_ch = &privptr->channel[WRITE_CHANNEL];
325         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
326         rc=claw_hw_tx( skb, dev, 1 );
327         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
328         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
329         if (rc)
330                 rc = NETDEV_TX_BUSY;
331         else
332                 rc = NETDEV_TX_OK;
333         return rc;
334 }   /*  end of claw_tx */
335 
336 /*------------------------------------------------------------------*
337  *  pack the collect queue into an skb and return it                *
338  *   If not packing just return the top skb from the queue          *
339  *------------------------------------------------------------------*/
340 
341 static struct sk_buff *
342 claw_pack_skb(struct claw_privbk *privptr)
343 {
344         struct sk_buff *new_skb,*held_skb;
345         struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
346         struct claw_env  *p_env = privptr->p_env;
347         int     pkt_cnt,pk_ind,so_far;
348 
349         new_skb = NULL;         /* assume no dice */
350         pkt_cnt = 0;
351         CLAW_DBF_TEXT(4, trace, "PackSKBe");
352         if (!skb_queue_empty(&p_ch->collect_queue)) {
353         /* some data */
354                 held_skb = skb_dequeue(&p_ch->collect_queue);
355                 if (held_skb)
356                         dev_kfree_skb_any(held_skb);
357                 else
358                         return NULL;
359                 if (p_env->packing != DO_PACKED)
360                         return held_skb;
361                 /* get a new SKB we will pack at least one */
362                 new_skb = dev_alloc_skb(p_env->write_size);
363                 if (new_skb == NULL) {
364                         atomic_inc(&held_skb->users);
365                         skb_queue_head(&p_ch->collect_queue,held_skb);
366                         return NULL;
367                 }
368                 /* we have packed packet and a place to put it  */
369                 pk_ind = 1;
370                 so_far = 0;
371                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
372                 while ((pk_ind) && (held_skb != NULL)) {
373                         if (held_skb->len+so_far <= p_env->write_size-8) {
374                                 memcpy(skb_put(new_skb,held_skb->len),
375                                         held_skb->data,held_skb->len);
376                                 privptr->stats.tx_packets++;
377                                 so_far += held_skb->len;
378                                 pkt_cnt++;
379                                 dev_kfree_skb_any(held_skb);
380                                 held_skb = skb_dequeue(&p_ch->collect_queue);
381                                 if (held_skb)
382                                         atomic_dec(&held_skb->users);
383                         } else {
384                                 pk_ind = 0;
385                                 atomic_inc(&held_skb->users);
386                                 skb_queue_head(&p_ch->collect_queue,held_skb);
387                         }
388                 }
389         }
390         CLAW_DBF_TEXT(4, trace, "PackSKBx");
391         return new_skb;
392 }
393 
394 /*-------------------------------------------------------------------*
395  *   claw_change_mtu                                                 *
396  *                                                                   *
397  *-------------------------------------------------------------------*/
398 
399 static int
400 claw_change_mtu(struct net_device *dev, int new_mtu)
401 {
402         struct claw_privbk *privptr = dev->ml_priv;
403         int buff_size;
404         CLAW_DBF_TEXT(4, trace, "setmtu");
405         buff_size = privptr->p_env->write_size;
406         if ((new_mtu < 60) || (new_mtu > buff_size)) {
407                 return -EINVAL;
408         }
409         dev->mtu = new_mtu;
410         return 0;
411 }  /*   end of claw_change_mtu */
412 
413 
414 /*-------------------------------------------------------------------*
415  *   claw_open                                                       *
416  *                                                                   *
417  *-------------------------------------------------------------------*/
418 static int
419 claw_open(struct net_device *dev)
420 {
421 
422         int     rc;
423         int     i;
424         unsigned long       saveflags=0;
425         unsigned long       parm;
426         struct claw_privbk  *privptr;
427         DECLARE_WAITQUEUE(wait, current);
428         struct timer_list  timer;
429         struct ccwbk *p_buf;
430 
431         CLAW_DBF_TEXT(4, trace, "open");
432         privptr = (struct claw_privbk *)dev->ml_priv;
433         /*   allocate and initialize CCW blocks */
434         if (privptr->buffs_alloc == 0) {
435                 rc=init_ccw_bk(dev);
436                 if (rc) {
437                         CLAW_DBF_TEXT(2, trace, "openmem");
438                         return -ENOMEM;
439                 }
440         }
441         privptr->system_validate_comp=0;
442         privptr->release_pend=0;
443         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
444                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
445                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
446                 privptr->p_env->packing=PACKING_ASK;
447         } else {
448                 privptr->p_env->packing=0;
449                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
450                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
451         }
452         claw_set_busy(dev);
453         tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
454                 (unsigned long) &privptr->channel[READ_CHANNEL]);
455         for ( i = 0; i < 2;  i++) {
456                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
457                 init_waitqueue_head(&privptr->channel[i].wait);
458                 /* skb_queue_head_init(&p_ch->io_queue); */
459                 if (i == WRITE_CHANNEL)
460                         skb_queue_head_init(
461                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
462                 privptr->channel[i].flag_a = 0;
463                 privptr->channel[i].IO_active = 0;
464                 privptr->channel[i].flag  &= ~CLAW_TIMER;
465                 init_timer(&timer);
466                 timer.function = (void *)claw_timer;
467                 timer.data = (unsigned long)(&privptr->channel[i]);
468                 timer.expires = jiffies + 15*HZ;
469                 add_timer(&timer);
470                 spin_lock_irqsave(get_ccwdev_lock(
471                         privptr->channel[i].cdev), saveflags);
472                 parm = (unsigned long) &privptr->channel[i];
473                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
474                 rc = 0;
475                 add_wait_queue(&privptr->channel[i].wait, &wait);
476                 rc = ccw_device_halt(
477                         (struct ccw_device *)privptr->channel[i].cdev,parm);
478                 set_current_state(TASK_INTERRUPTIBLE);
479                 spin_unlock_irqrestore(
480                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
481                 schedule();
482                 remove_wait_queue(&privptr->channel[i].wait, &wait);
483                 if(rc != 0)
484                         ccw_check_return_code(privptr->channel[i].cdev, rc);
485                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
486                         del_timer(&timer);
487         }
488         if ((((privptr->channel[READ_CHANNEL].last_dstat |
489                 privptr->channel[WRITE_CHANNEL].last_dstat) &
490            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
491            (((privptr->channel[READ_CHANNEL].flag |
492                 privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
493                 dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
494                         "%s: remote side is not ready\n", dev->name);
495                 CLAW_DBF_TEXT(2, trace, "notrdy");
496 
497                 for ( i = 0; i < 2;  i++) {
498                         spin_lock_irqsave(
499                                 get_ccwdev_lock(privptr->channel[i].cdev),
500                                 saveflags);
501                         parm = (unsigned long) &privptr->channel[i];
502                         privptr->channel[i].claw_state = CLAW_STOP;
503                         rc = ccw_device_halt(
504                                 (struct ccw_device *)&privptr->channel[i].cdev,
505                                 parm);
506                         spin_unlock_irqrestore(
507                                 get_ccwdev_lock(privptr->channel[i].cdev),
508                                 saveflags);
509                         if (rc != 0) {
510                                 ccw_check_return_code(
511                                         privptr->channel[i].cdev, rc);
512                         }
513                 }
514                 free_pages((unsigned long)privptr->p_buff_ccw,
515                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
516                 if (privptr->p_env->read_size < PAGE_SIZE) {
517                         free_pages((unsigned long)privptr->p_buff_read,
518                                (int)pages_to_order_of_mag(
519                                         privptr->p_buff_read_num));
520                 }
521                 else {
522                         p_buf=privptr->p_read_active_first;
523                         while (p_buf!=NULL) {
524                                 free_pages((unsigned long)p_buf->p_buffer,
525                                       (int)pages_to_order_of_mag(
526                                         privptr->p_buff_pages_perread ));
527                                 p_buf=p_buf->next;
528                         }
529                 }
530                 if (privptr->p_env->write_size < PAGE_SIZE ) {
531                         free_pages((unsigned long)privptr->p_buff_write,
532                              (int)pages_to_order_of_mag(
533                                 privptr->p_buff_write_num));
534                 }
535                 else {
536                         p_buf=privptr->p_write_active_first;
537                         while (p_buf!=NULL) {
538                                 free_pages((unsigned long)p_buf->p_buffer,
539                                      (int)pages_to_order_of_mag(
540                                         privptr->p_buff_pages_perwrite ));
541                                 p_buf=p_buf->next;
542                         }
543                 }
544                 privptr->buffs_alloc = 0;
545                 privptr->channel[READ_CHANNEL].flag = 0x00;
546                 privptr->channel[WRITE_CHANNEL].flag = 0x00;
547                 privptr->p_buff_ccw=NULL;
548                 privptr->p_buff_read=NULL;
549                 privptr->p_buff_write=NULL;
550                 claw_clear_busy(dev);
551                 CLAW_DBF_TEXT(2, trace, "open EIO");
552                 return -EIO;
553         }
554 
555         /*   Send SystemValidate command */
556 
557         claw_clear_busy(dev);
558         CLAW_DBF_TEXT(4, trace, "openok");
559         return 0;
560 }    /*     end of claw_open    */
561 
562 /*-------------------------------------------------------------------*
563 *                                                                    *
564 *       claw_irq_handler                                             *
565 *                                                                    *
566 *--------------------------------------------------------------------*/
567 static void
568 claw_irq_handler(struct ccw_device *cdev,
569         unsigned long intparm, struct irb *irb)
570 {
571         struct chbk *p_ch = NULL;
572         struct claw_privbk *privptr = NULL;
573         struct net_device *dev = NULL;
574         struct claw_env  *p_env;
575         struct chbk *p_ch_r=NULL;
576 
577         CLAW_DBF_TEXT(4, trace, "clawirq");
578         /* Bypass all 'unsolicited interrupts' */
579         privptr = dev_get_drvdata(&cdev->dev);
580         if (!privptr) {
581                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
582                         " IRQ, c-%02x d-%02x\n",
583                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
584                 CLAW_DBF_TEXT(2, trace, "badirq");
585                 return;
586         }
587 
588         /* Try to extract channel from driver data. */
589         if (privptr->channel[READ_CHANNEL].cdev == cdev)
590                 p_ch = &privptr->channel[READ_CHANNEL];
591         else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
592                 p_ch = &privptr->channel[WRITE_CHANNEL];
593         else {
594                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
595                 CLAW_DBF_TEXT(2, trace, "badchan");
596                 return;
597         }
598         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
599 
600         dev = (struct net_device *) (p_ch->ndev);
601         p_env=privptr->p_env;
602 
603         /* Copy interruption response block. */
604         memcpy(p_ch->irb, irb, sizeof(struct irb));
605 
606         /* Check for good subchannel return code, otherwise info message */
607         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
608                 dev_info(&cdev->dev,
609                         "%s: subchannel check for device: %04x -"
610                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
611                         dev->name, p_ch->devno,
612                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
613                         irb->scsw.cmd.cpa);
614                 CLAW_DBF_TEXT(2, trace, "chanchk");
615                 /* return; */
616         }
617 
618         /* Check the reason-code of a unit check */
619         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
620                 ccw_check_unit_check(p_ch, irb->ecw[0]);
621 
622         /* State machine to bring the connection up, down and to restart */
623         p_ch->last_dstat = irb->scsw.cmd.dstat;
624 
625         switch (p_ch->claw_state) {
626         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
627                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
628                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
629                 (p_ch->irb->scsw.cmd.stctl ==
630                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
631                         return;
632                 wake_up(&p_ch->wait);   /* wake up claw_release */
633                 CLAW_DBF_TEXT(4, trace, "stop");
634                 return;
635         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
636                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
637                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
638                 (p_ch->irb->scsw.cmd.stctl ==
639                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
640                         CLAW_DBF_TEXT(4, trace, "haltio");
641                         return;
642                 }
643                 if (p_ch->flag == CLAW_READ) {
644                         p_ch->claw_state = CLAW_START_READ;
645                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
646                 } else if (p_ch->flag == CLAW_WRITE) {
647                         p_ch->claw_state = CLAW_START_WRITE;
648                         /*      send SYSTEM_VALIDATE                    */
649                         claw_strt_read(dev, LOCK_NO);
650                         claw_send_control(dev,
651                                 SYSTEM_VALIDATE_REQUEST,
652                                 0, 0, 0,
653                                 p_env->host_name,
654                                 p_env->adapter_name);
655                 } else {
656                         dev_warn(&cdev->dev, "The CLAW device received"
657                                 " an unexpected IRQ, "
658                                 "c-%02x d-%02x\n",
659                                 irb->scsw.cmd.cstat,
660                                 irb->scsw.cmd.dstat);
661                         return;
662                         }
663                 CLAW_DBF_TEXT(4, trace, "haltio");
664                 return;
665         case CLAW_START_READ:
666                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
667                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
668                         clear_bit(0, (void *)&p_ch->IO_active);
669                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
670                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
671                             (p_ch->irb->ecw[0])        == 0) {
672                                 privptr->stats.rx_errors++;
673                                 dev_info(&cdev->dev,
674                                         "%s: Restart is required after remote "
675                                         "side recovers \n",
676                                         dev->name);
677                         }
678                         CLAW_DBF_TEXT(4, trace, "notrdy");
679                         return;
680                 }
681                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
682                         (p_ch->irb->scsw.cmd.dstat == 0)) {
683                         if (test_and_set_bit(CLAW_BH_ACTIVE,
684                                 (void *)&p_ch->flag_a) == 0)
685                                 tasklet_schedule(&p_ch->tasklet);
686                         else
687                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
688                         CLAW_DBF_TEXT(4, trace, "PCI_read");
689                         return;
690                 }
691                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
692                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
693                  (p_ch->irb->scsw.cmd.stctl ==
694                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
695                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
696                         return;
697                 }
698                 clear_bit(0, (void *)&p_ch->IO_active);
699                 claw_clearbit_busy(TB_RETRY, dev);
700                 if (test_and_set_bit(CLAW_BH_ACTIVE,
701                         (void *)&p_ch->flag_a) == 0)
702                         tasklet_schedule(&p_ch->tasklet);
703                 else
704                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
705                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
706                 return;
707         case CLAW_START_WRITE:
708                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
709                         dev_info(&cdev->dev,
710                                 "%s: Unit Check Occurred in "
711                                 "write channel\n", dev->name);
712                         clear_bit(0, (void *)&p_ch->IO_active);
713                         if (p_ch->irb->ecw[0] & 0x80) {
714                                 dev_info(&cdev->dev,
715                                         "%s: Resetting Event "
716                                         "occurred:\n", dev->name);
717                                 init_timer(&p_ch->timer);
718                                 p_ch->timer.function =
719                                         (void *)claw_write_retry;
720                                 p_ch->timer.data = (unsigned long)p_ch;
721                                 p_ch->timer.expires = jiffies + 10*HZ;
722                                 add_timer(&p_ch->timer);
723                                 dev_info(&cdev->dev,
724                                         "%s: write connection "
725                                         "restarting\n", dev->name);
726                         }
727                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
728                         return;
729                 }
730                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
731                         clear_bit(0, (void *)&p_ch->IO_active);
732                         dev_info(&cdev->dev,
733                                 "%s: Unit Exception "
734                                 "occurred in write channel\n",
735                                 dev->name);
736                 }
737                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
738                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
739                 (p_ch->irb->scsw.cmd.stctl ==
740                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
741                         CLAW_DBF_TEXT(4, trace, "writeUE");
742                         return;
743                 }
744                 clear_bit(0, (void *)&p_ch->IO_active);
745                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
746                         claw_write_next(p_ch);
747                         claw_clearbit_busy(TB_TX, dev);
748                         claw_clear_busy(dev);
749                 }
750                 p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
751                 if (test_and_set_bit(CLAW_BH_ACTIVE,
752                         (void *)&p_ch_r->flag_a) == 0)
753                         tasklet_schedule(&p_ch_r->tasklet);
754                 CLAW_DBF_TEXT(4, trace, "StWtExit");
755                 return;
756         default:
757                 dev_warn(&cdev->dev,
758                         "The CLAW device for %s received an unexpected IRQ\n",
759                          dev->name);
760                 CLAW_DBF_TEXT(2, trace, "badIRQ");
761                 return;
762         }
763 
764 }       /*   end of claw_irq_handler    */
765 
766 
767 /*-------------------------------------------------------------------*
768 *       claw_irq_tasklet                                             *
769 *                                                                    *
770 *--------------------------------------------------------------------*/
771 static void
772 claw_irq_tasklet ( unsigned long data )
773 {
774         struct chbk * p_ch;
775         struct net_device  *dev;
776 
777         p_ch = (struct chbk *) data;
778         dev = (struct net_device *)p_ch->ndev;
779         CLAW_DBF_TEXT(4, trace, "IRQtask");
780         unpack_read(dev);
781         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
782         CLAW_DBF_TEXT(4, trace, "TskletXt");
783         return;
784 }       /*    end of claw_irq_bh    */
785 
786 /*-------------------------------------------------------------------*
787 *       claw_release                                                 *
788 *                                                                    *
789 *--------------------------------------------------------------------*/
790 static int
791 claw_release(struct net_device *dev)
792 {
793         int                rc;
794         int                i;
795         unsigned long      saveflags;
796         unsigned long      parm;
797         struct claw_privbk *privptr;
798         DECLARE_WAITQUEUE(wait, current);
799         struct ccwbk*             p_this_ccw;
800         struct ccwbk*             p_buf;
801 
802         if (!dev)
803                 return 0;
804         privptr = (struct claw_privbk *)dev->ml_priv;
805         if (!privptr)
806                 return 0;
807         CLAW_DBF_TEXT(4, trace, "release");
808         privptr->release_pend=1;
809         claw_setbit_busy(TB_STOP,dev);
810         for ( i = 1; i >=0 ;  i--) {
811                 spin_lock_irqsave(
812                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
813              /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
814                 privptr->channel[i].claw_state = CLAW_STOP;
815                 privptr->channel[i].IO_active = 0;
816                 parm = (unsigned long) &privptr->channel[i];
817                 if (i == WRITE_CHANNEL)
818                         claw_purge_skb_queue(
819                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
820                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
821                 if (privptr->system_validate_comp==0x00)  /* never opened? */
822                    init_waitqueue_head(&privptr->channel[i].wait);
823                 add_wait_queue(&privptr->channel[i].wait, &wait);
824                 set_current_state(TASK_INTERRUPTIBLE);
825                 spin_unlock_irqrestore(
826                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
827                 schedule();
828                 remove_wait_queue(&privptr->channel[i].wait, &wait);
829                 if (rc != 0) {
830                         ccw_check_return_code(privptr->channel[i].cdev, rc);
831                 }
832         }
833         if (privptr->pk_skb != NULL) {
834                 dev_kfree_skb_any(privptr->pk_skb);
835                 privptr->pk_skb = NULL;
836         }
837         if(privptr->buffs_alloc != 1) {
838                 CLAW_DBF_TEXT(4, trace, "none2fre");
839                 return 0;
840         }
841         CLAW_DBF_TEXT(4, trace, "freebufs");
842         if (privptr->p_buff_ccw != NULL) {
843                 free_pages((unsigned long)privptr->p_buff_ccw,
844                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
845         }
846         CLAW_DBF_TEXT(4, trace, "freeread");
847         if (privptr->p_env->read_size < PAGE_SIZE) {
848             if (privptr->p_buff_read != NULL) {
849                 free_pages((unsigned long)privptr->p_buff_read,
850                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
851                 }
852         }
853         else {
854                 p_buf=privptr->p_read_active_first;
855                 while (p_buf!=NULL) {
856                         free_pages((unsigned long)p_buf->p_buffer,
857                              (int)pages_to_order_of_mag(
858                                 privptr->p_buff_pages_perread ));
859                         p_buf=p_buf->next;
860                 }
861         }
862          CLAW_DBF_TEXT(4, trace, "freewrit");
863         if (privptr->p_env->write_size < PAGE_SIZE ) {
864                 free_pages((unsigned long)privptr->p_buff_write,
865                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
866         }
867         else {
868                 p_buf=privptr->p_write_active_first;
869                 while (p_buf!=NULL) {
870                         free_pages((unsigned long)p_buf->p_buffer,
871                               (int)pages_to_order_of_mag(
872                               privptr->p_buff_pages_perwrite ));
873                         p_buf=p_buf->next;
874                 }
875         }
876          CLAW_DBF_TEXT(4, trace, "clearptr");
877         privptr->buffs_alloc = 0;
878         privptr->p_buff_ccw=NULL;
879         privptr->p_buff_read=NULL;
880         privptr->p_buff_write=NULL;
881         privptr->system_validate_comp=0;
882         privptr->release_pend=0;
883         /*      Remove any writes that were pending and reset all reads   */
884         p_this_ccw=privptr->p_read_active_first;
885         while (p_this_ccw!=NULL) {
886                 p_this_ccw->header.length=0xffff;
887                 p_this_ccw->header.opcode=0xff;
888                 p_this_ccw->header.flag=0x00;
889                 p_this_ccw=p_this_ccw->next;
890         }
891 
892         while (privptr->p_write_active_first!=NULL) {
893                 p_this_ccw=privptr->p_write_active_first;
894                 p_this_ccw->header.flag=CLAW_PENDING;
895                 privptr->p_write_active_first=p_this_ccw->next;
896                 p_this_ccw->next=privptr->p_write_free_chain;
897                 privptr->p_write_free_chain=p_this_ccw;
898                 ++privptr->write_free_count;
899         }
900         privptr->p_write_active_last=NULL;
901         privptr->mtc_logical_link = -1;
902         privptr->mtc_skipping = 1;
903         privptr->mtc_offset=0;
904 
905         if (((privptr->channel[READ_CHANNEL].last_dstat |
906                 privptr->channel[WRITE_CHANNEL].last_dstat) &
907                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
908                 dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
909                         "Deactivating %s completed with incorrect"
910                         " subchannel status "
911                         "(read %02x, write %02x)\n",
912                 dev->name,
913                 privptr->channel[READ_CHANNEL].last_dstat,
914                 privptr->channel[WRITE_CHANNEL].last_dstat);
915                  CLAW_DBF_TEXT(2, trace, "badclose");
916         }
917         CLAW_DBF_TEXT(4, trace, "rlsexit");
918         return 0;
919 }      /* end of claw_release     */
920 
921 /*-------------------------------------------------------------------*
922 *       claw_write_retry                                             *
923 *                                                                    *
924 *--------------------------------------------------------------------*/
925 
926 static void
927 claw_write_retry ( struct chbk *p_ch )
928 {
929 
930         struct net_device  *dev=p_ch->ndev;
931 
932         CLAW_DBF_TEXT(4, trace, "w_retry");
933         if (p_ch->claw_state == CLAW_STOP) {
934                 return;
935         }
936         claw_strt_out_IO( dev );
937         CLAW_DBF_TEXT(4, trace, "rtry_xit");
938         return;
939 }      /* end of claw_write_retry      */
940 
941 
942 /*-------------------------------------------------------------------*
943 *       claw_write_next                                              *
944 *                                                                    *
945 *--------------------------------------------------------------------*/
946 
947 static void
948 claw_write_next ( struct chbk * p_ch )
949 {
950 
951         struct net_device  *dev;
952         struct claw_privbk *privptr=NULL;
953         struct sk_buff *pk_skb;
954 
955         CLAW_DBF_TEXT(4, trace, "claw_wrt");
956         if (p_ch->claw_state == CLAW_STOP)
957                 return;
958         dev = (struct net_device *) p_ch->ndev;
959         privptr = (struct claw_privbk *) dev->ml_priv;
960         claw_free_wrt_buf( dev );
961         if ((privptr->write_free_count > 0) &&
962             !skb_queue_empty(&p_ch->collect_queue)) {
963                 pk_skb = claw_pack_skb(privptr);
964                 while (pk_skb != NULL) {
965                         claw_hw_tx(pk_skb, dev, 1);
966                         if (privptr->write_free_count > 0) {
967                                 pk_skb = claw_pack_skb(privptr);
968                         } else
969                                 pk_skb = NULL;
970                 }
971         }
972         if (privptr->p_write_active_first!=NULL) {
973                 claw_strt_out_IO(dev);
974         }
975         return;
976 }      /* end of claw_write_next      */
977 
978 /*-------------------------------------------------------------------*
979 *                                                                    *
980 *       claw_timer                                                   *
981 *--------------------------------------------------------------------*/
982 
983 static void
984 claw_timer ( struct chbk * p_ch )
985 {
986         CLAW_DBF_TEXT(4, trace, "timer");
987         p_ch->flag |= CLAW_TIMER;
988         wake_up(&p_ch->wait);
989         return;
990 }      /* end of claw_timer  */
991 
992 /*
993 *
994 *       functions
995 */
996 
997 
998 /*-------------------------------------------------------------------*
999 *                                                                    *
1000 *     pages_to_order_of_mag                                          *
1001 *                                                                    *
1002 *    takes a number of pages from 1 to 512 and returns the           *
1003 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1004 *    of magnitude get_free_pages() has an upper order of 9           *
1005 *--------------------------------------------------------------------*/
1006 
1007 static int
1008 pages_to_order_of_mag(int num_of_pages)
1009 {
1010         int     order_of_mag=1;         /* assume 2 pages */
1011         int     nump;
1012 
1013         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1014         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1015         /* 512 pages = 2Meg on 4k page systems */
1016         if (num_of_pages >= 512) {return 9; }
1017         /* we have two or more pages order is at least 1 */
1018         for (nump=2 ;nump <= 512;nump*=2) {
1019           if (num_of_pages <= nump)
1020                   break;
1021           order_of_mag +=1;
1022         }
1023         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1024         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1025         return order_of_mag;
1026 }
1027 
1028 /*-------------------------------------------------------------------*
1029 *                                                                    *
1030 *     add_claw_reads                                                 *
1031 *                                                                    *
1032 *--------------------------------------------------------------------*/
1033 static int
1034 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1035         struct ccwbk* p_last)
1036 {
1037         struct claw_privbk *privptr;
1038         struct ccw1  temp_ccw;
1039         struct endccw * p_end;
1040         CLAW_DBF_TEXT(4, trace, "addreads");
1041         privptr = dev->ml_priv;
1042         p_end = privptr->p_end_ccw;
1043 
1044         /* first CCW and last CCW contains a new set of read channel programs
1045         *       to apend the running channel programs
1046         */
1047         if ( p_first==NULL) {
1048                 CLAW_DBF_TEXT(4, trace, "addexit");
1049                 return 0;
1050         }
1051 
1052         /* set up ending CCW sequence for this segment */
1053         if (p_end->read1) {
1054                 p_end->read1=0x00;    /*  second ending CCW is now active */
1055                 /*      reset ending CCWs and setup TIC CCWs              */
1056                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1057                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1058                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1059                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1060                 p_end->read2_nop2.cda=0;
1061                 p_end->read2_nop2.count=1;
1062         }
1063         else {
1064                 p_end->read1=0x01;  /* first ending CCW is now active */
1065                 /*      reset ending CCWs and setup TIC CCWs          */
1066                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1067                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1068                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1069                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1070                 p_end->read1_nop2.cda=0;
1071                 p_end->read1_nop2.count=1;
1072         }
1073 
1074         if ( privptr-> p_read_active_first ==NULL ) {
1075                 privptr->p_read_active_first = p_first;  /*  set new first */
1076                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1077         }
1078         else {
1079 
1080                 /* set up TIC ccw  */
1081                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1082                 temp_ccw.count=0;
1083                 temp_ccw.flags=0;
1084                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1085 
1086 
1087                 if (p_end->read1) {
1088 
1089                /* first set of CCW's is chained to the new read              */
1090                /* chain, so the second set is chained to the active chain.   */
1091                /* Therefore modify the second set to point to the new        */
1092                /* read chain set up TIC CCWs                                 */
1093                /* make sure we update the CCW so channel doesn't fetch it    */
1094                /* when it's only half done                                   */
1095                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1096                                 sizeof(struct ccw1));
1097                         privptr->p_read_active_last->r_TIC_1.cda=
1098                                 (__u32)__pa(&p_first->read);
1099                         privptr->p_read_active_last->r_TIC_2.cda=
1100                                 (__u32)__pa(&p_first->read);
1101                 }
1102                 else {
1103                         /* make sure we update the CCW so channel doesn't   */
1104                         /* fetch it when it is only half done               */
1105                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1106                                 sizeof(struct ccw1));
1107                         privptr->p_read_active_last->r_TIC_1.cda=
1108                                 (__u32)__pa(&p_first->read);
1109                         privptr->p_read_active_last->r_TIC_2.cda=
1110                                 (__u32)__pa(&p_first->read);
1111                 }
1112                 /*      chain in new set of blocks                         */
1113                 privptr->p_read_active_last->next = p_first;
1114                 privptr->p_read_active_last=p_last;
1115         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1116         CLAW_DBF_TEXT(4, trace, "addexit");
1117         return 0;
1118 }    /*     end of add_claw_reads   */
1119 
1120 /*-------------------------------------------------------------------*
1121  *   ccw_check_return_code                                           *
1122  *                                                                   *
1123  *-------------------------------------------------------------------*/
1124 
1125 static void
1126 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1127 {
1128         CLAW_DBF_TEXT(4, trace, "ccwret");
1129         if (return_code != 0) {
1130                 switch (return_code) {
1131                 case -EBUSY: /* BUSY is a transient state no action needed */
1132                         break;
1133                 case -ENODEV:
1134                         dev_err(&cdev->dev, "The remote channel adapter is not"
1135                                 " available\n");
1136                         break;
1137                 case -EINVAL:
1138                         dev_err(&cdev->dev,
1139                                 "The status of the remote channel adapter"
1140                                 " is not valid\n");
1141                         break;
1142                 default:
1143                         dev_err(&cdev->dev, "The common device layer"
1144                                 " returned error code %d\n",
1145                                   return_code);
1146                 }
1147         }
1148         CLAW_DBF_TEXT(4, trace, "ccwret");
1149 }    /*    end of ccw_check_return_code   */
1150 
1151 /*-------------------------------------------------------------------*
1152 *       ccw_check_unit_check                                         *
1153 *--------------------------------------------------------------------*/
1154 
1155 static void
1156 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1157 {
1158         struct net_device *ndev = p_ch->ndev;
1159         struct device *dev = &p_ch->cdev->dev;
1160 
1161         CLAW_DBF_TEXT(4, trace, "unitchek");
1162         dev_warn(dev, "The communication peer of %s disconnected\n",
1163                 ndev->name);
1164 
1165         if (sense & 0x40) {
1166                 if (sense & 0x01) {
1167                         dev_warn(dev, "The remote channel adapter for"
1168                                 " %s has been reset\n",
1169                                 ndev->name);
1170                 }
1171         } else if (sense & 0x20) {
1172                 if (sense & 0x04) {
1173                         dev_warn(dev, "A data streaming timeout occurred"
1174                                 " for %s\n",
1175                                 ndev->name);
1176                 } else if (sense & 0x10) {
1177                         dev_warn(dev, "The remote channel adapter for %s"
1178                                 " is faulty\n",
1179                                 ndev->name);
1180                 } else {
1181                         dev_warn(dev, "A data transfer parity error occurred"
1182                                 " for %s\n",
1183                                 ndev->name);
1184                 }
1185         } else if (sense & 0x10) {
1186                 dev_warn(dev, "A read data parity error occurred"
1187                         " for %s\n",
1188                         ndev->name);
1189         }
1190 
1191 }   /*    end of ccw_check_unit_check    */
1192 
1193 /*-------------------------------------------------------------------*
1194 *               find_link                                            *
1195 *--------------------------------------------------------------------*/
1196 static int
1197 find_link(struct net_device *dev, char *host_name, char *ws_name )
1198 {
1199         struct claw_privbk *privptr;
1200         struct claw_env *p_env;
1201         int    rc=0;
1202 
1203         CLAW_DBF_TEXT(2, setup, "findlink");
1204         privptr = dev->ml_priv;
1205         p_env=privptr->p_env;
1206         switch (p_env->packing)
1207         {
1208                 case  PACKING_ASK:
1209                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1210                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1211                              rc = EINVAL;
1212                         break;
1213                 case  DO_PACKED:
1214                 case  PACK_SEND:
1215                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1216                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1217                                 rc = EINVAL;
1218                         break;
1219                 default:
1220                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1221                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1222                                 rc = EINVAL;
1223                         break;
1224         }
1225 
1226         return rc;
1227 }    /*    end of find_link    */
1228 
1229 /*-------------------------------------------------------------------*
1230  *   claw_hw_tx                                                      *
1231  *                                                                   *
1232  *                                                                   *
1233  *-------------------------------------------------------------------*/
1234 
1235 static int
1236 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1237 {
1238         int                             rc=0;
1239         struct claw_privbk              *privptr;
1240         struct ccwbk           *p_this_ccw;
1241         struct ccwbk           *p_first_ccw;
1242         struct ccwbk           *p_last_ccw;
1243         __u32                           numBuffers;
1244         signed long                     len_of_data;
1245         unsigned long                   bytesInThisBuffer;
1246         unsigned char                   *pDataAddress;
1247         struct endccw                   *pEnd;
1248         struct ccw1                     tempCCW;
1249         struct claw_env                 *p_env;
1250         struct clawph                   *pk_head;
1251         struct chbk                     *ch;
1252 
1253         CLAW_DBF_TEXT(4, trace, "hw_tx");
1254         privptr = (struct claw_privbk *)(dev->ml_priv);
1255         p_env =privptr->p_env;
1256         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1257         /*  scan the write queue to free any completed write packets   */
1258         p_first_ccw=NULL;
1259         p_last_ccw=NULL;
1260         if ((p_env->packing >= PACK_SEND) &&
1261             (skb->cb[1] != 'P')) {
1262                 skb_push(skb,sizeof(struct clawph));
1263                 pk_head=(struct clawph *)skb->data;
1264                 pk_head->len=skb->len-sizeof(struct clawph);
1265                 if (pk_head->len%4)  {
1266                         pk_head->len+= 4-(pk_head->len%4);
1267                         skb_pad(skb,4-(pk_head->len%4));
1268                         skb_put(skb,4-(pk_head->len%4));
1269                 }
1270                 if (p_env->packing == DO_PACKED)
1271                         pk_head->link_num = linkid;
1272                 else
1273                         pk_head->link_num = 0;
1274                 pk_head->flag = 0x00;
1275                 skb_pad(skb,4);
1276                 skb->cb[1] = 'P';
1277         }
1278         if (linkid == 0) {
1279                 if (claw_check_busy(dev)) {
1280                         if (privptr->write_free_count!=0) {
1281                                 claw_clear_busy(dev);
1282                         }
1283                         else {
1284                                 claw_strt_out_IO(dev );
1285                                 claw_free_wrt_buf( dev );
1286                                 if (privptr->write_free_count==0) {
1287                                         ch = &privptr->channel[WRITE_CHANNEL];
1288                                         atomic_inc(&skb->users);
1289                                         skb_queue_tail(&ch->collect_queue, skb);
1290                                         goto Done;
1291                                 }
1292                                 else {
1293                                         claw_clear_busy(dev);
1294                                 }
1295                         }
1296                 }
1297                 /*  tx lock  */
1298                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1299                         ch = &privptr->channel[WRITE_CHANNEL];
1300                         atomic_inc(&skb->users);
1301                         skb_queue_tail(&ch->collect_queue, skb);
1302                         claw_strt_out_IO(dev );
1303                         rc=-EBUSY;
1304                         goto Done2;
1305                 }
1306         }
1307         /*      See how many write buffers are required to hold this data */
1308         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1309 
1310         /*      If that number of buffers isn't available, give up for now */
1311         if (privptr->write_free_count < numBuffers ||
1312             privptr->p_write_free_chain == NULL ) {
1313 
1314                 claw_setbit_busy(TB_NOBUFFER,dev);
1315                 ch = &privptr->channel[WRITE_CHANNEL];
1316                 atomic_inc(&skb->users);
1317                 skb_queue_tail(&ch->collect_queue, skb);
1318                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1319                 goto Done2;
1320         }
1321         pDataAddress=skb->data;
1322         len_of_data=skb->len;
1323 
1324         while (len_of_data > 0) {
1325                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1326                 if (p_this_ccw == NULL) { /* lost the race */
1327                         ch = &privptr->channel[WRITE_CHANNEL];
1328                         atomic_inc(&skb->users);
1329                         skb_queue_tail(&ch->collect_queue, skb);
1330                         goto Done2;
1331                 }
1332                 privptr->p_write_free_chain=p_this_ccw->next;
1333                 p_this_ccw->next=NULL;
1334                 --privptr->write_free_count; /* -1 */
1335                 if (len_of_data >= privptr->p_env->write_size)
1336                         bytesInThisBuffer = privptr->p_env->write_size;
1337                 else
1338                         bytesInThisBuffer = len_of_data;
1339                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1340                 len_of_data-=bytesInThisBuffer;
1341                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1342                 /*      setup write CCW         */
1343                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1344                 if (len_of_data>0) {
1345                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1346                 }
1347                 p_this_ccw->write.count=bytesInThisBuffer;
1348                 /*      now add to end of this chain    */
1349                 if (p_first_ccw==NULL)    {
1350                         p_first_ccw=p_this_ccw;
1351                 }
1352                 if (p_last_ccw!=NULL) {
1353                         p_last_ccw->next=p_this_ccw;
1354                         /*      set up TIC ccws         */
1355                         p_last_ccw->w_TIC_1.cda=
1356                                 (__u32)__pa(&p_this_ccw->write);
1357                 }
1358                 p_last_ccw=p_this_ccw;      /* save new last block */
1359         }
1360 
1361         /*      FirstCCW and LastCCW now contain a new set of write channel
1362         *       programs to append to the running channel program
1363         */
1364 
1365         if (p_first_ccw!=NULL) {
1366                 /*      setup ending ccw sequence for this segment           */
1367                 pEnd=privptr->p_end_ccw;
1368                 if (pEnd->write1) {
1369                         pEnd->write1=0x00;   /* second end ccw is now active */
1370                         /*      set up Tic CCWs         */
1371                         p_last_ccw->w_TIC_1.cda=
1372                                 (__u32)__pa(&pEnd->write2_nop1);
1373                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1374                         pEnd->write2_nop2.flags    =
1375                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1376                         pEnd->write2_nop2.cda=0;
1377                         pEnd->write2_nop2.count=1;
1378                 }
1379                 else {  /*  end of if (pEnd->write1)*/
1380                         pEnd->write1=0x01;   /* first end ccw is now active */
1381                         /*      set up Tic CCWs         */
1382                         p_last_ccw->w_TIC_1.cda=
1383                                 (__u32)__pa(&pEnd->write1_nop1);
1384                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1385                         pEnd->write1_nop2.flags    =
1386                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1387                         pEnd->write1_nop2.cda=0;
1388                         pEnd->write1_nop2.count=1;
1389                 }  /* end if if (pEnd->write1) */
1390 
1391                 if (privptr->p_write_active_first==NULL ) {
1392                         privptr->p_write_active_first=p_first_ccw;
1393                         privptr->p_write_active_last=p_last_ccw;
1394                 }
1395                 else {
1396                         /*      set up Tic CCWs         */
1397 
1398                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1399                         tempCCW.count=0;
1400                         tempCCW.flags=0;
1401                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1402 
1403                         if (pEnd->write1) {
1404 
1405                  /*
1406                  * first set of ending CCW's is chained to the new write
1407                  * chain, so the second set is chained to the active chain
1408                  * Therefore modify the second set to point the new write chain.
1409                  * make sure we update the CCW atomically
1410                  * so channel does not fetch it when it's only half done
1411                  */
1412                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1413                                         sizeof(struct ccw1));
1414                                 privptr->p_write_active_last->w_TIC_1.cda=
1415                                         (__u32)__pa(&p_first_ccw->write);
1416                         }
1417                         else {
1418 
1419                         /*make sure we update the CCW atomically
1420                          *so channel does not fetch it when it's only half done
1421                          */
1422                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1423                                         sizeof(struct ccw1));
1424                                 privptr->p_write_active_last->w_TIC_1.cda=
1425                                         (__u32)__pa(&p_first_ccw->write);
1426 
1427                         } /* end if if (pEnd->write1) */
1428 
1429                         privptr->p_write_active_last->next=p_first_ccw;
1430                         privptr->p_write_active_last=p_last_ccw;
1431                 }
1432 
1433         } /* endif (p_first_ccw!=NULL)  */
1434         dev_kfree_skb_any(skb);
1435         claw_strt_out_IO(dev );
1436         /*      if write free count is zero , set NOBUFFER       */
1437         if (privptr->write_free_count==0) {
1438                 claw_setbit_busy(TB_NOBUFFER,dev);
1439         }
1440 Done2:
1441         claw_clearbit_busy(TB_TX,dev);
1442 Done:
1443         return(rc);
1444 }    /*    end of claw_hw_tx    */
1445 
1446 /*-------------------------------------------------------------------*
1447 *                                                                    *
1448 *     init_ccw_bk                                                    *
1449 *                                                                    *
1450 *--------------------------------------------------------------------*/
1451 
1452 static int
1453 init_ccw_bk(struct net_device *dev)
1454 {
1455 
1456         __u32   ccw_blocks_required;
1457         __u32   ccw_blocks_perpage;
1458         __u32   ccw_pages_required;
1459         __u32   claw_reads_perpage=1;
1460         __u32   claw_read_pages;
1461         __u32   claw_writes_perpage=1;
1462         __u32   claw_write_pages;
1463         void    *p_buff=NULL;
1464         struct ccwbk*p_free_chain;
1465         struct ccwbk*p_buf;
1466         struct ccwbk*p_last_CCWB;
1467         struct ccwbk*p_first_CCWB;
1468         struct endccw *p_endccw=NULL;
1469         addr_t  real_address;
1470         struct claw_privbk *privptr = dev->ml_priv;
1471         struct clawh *pClawH=NULL;
1472         addr_t   real_TIC_address;
1473         int i,j;
1474         CLAW_DBF_TEXT(4, trace, "init_ccw");
1475 
1476         /*  initialize  statistics field */
1477         privptr->active_link_ID=0;
1478         /*  initialize  ccwbk pointers  */
1479         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1480         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1481         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1482         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1483         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1484         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1485         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1486         privptr->buffs_alloc = 0;
1487         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1488         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1489         /*  initialize  free write ccwbk counter  */
1490         privptr->write_free_count=0;  /* number of free bufs on write chain */
1491         p_last_CCWB = NULL;
1492         p_first_CCWB= NULL;
1493         /*
1494         *  We need 1 CCW block for each read buffer, 1 for each
1495         *  write buffer, plus 1 for ClawSignalBlock
1496         */
1497         ccw_blocks_required =
1498                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1499         /*
1500         * compute number of CCW blocks that will fit in a page
1501         */
1502         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1503         ccw_pages_required=
1504                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1505 
1506         /*
1507          *  read and write sizes are set by 2 constants in claw.h
1508          *  4k and 32k.  Unpacked values other than 4k are not going to
1509          * provide good performance. With packing buffers support 32k
1510          * buffers are used.
1511          */
1512         if (privptr->p_env->read_size < PAGE_SIZE) {
1513                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1514                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1515                                                 claw_reads_perpage);
1516          }
1517          else {       /* > or equal  */
1518                 privptr->p_buff_pages_perread =
1519                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1520                 claw_read_pages = privptr->p_env->read_buffers *
1521                                         privptr->p_buff_pages_perread;
1522          }
1523         if (privptr->p_env->write_size < PAGE_SIZE) {
1524                 claw_writes_perpage =
1525                         PAGE_SIZE / privptr->p_env->write_size;
1526                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1527                                                 claw_writes_perpage);
1528 
1529         }
1530         else {      /* >  or equal  */
1531                 privptr->p_buff_pages_perwrite =
1532                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1533                 claw_write_pages = privptr->p_env->write_buffers *
1534                                         privptr->p_buff_pages_perwrite;
1535         }
1536         /*
1537         *               allocate ccw_pages_required
1538         */
1539         if (privptr->p_buff_ccw==NULL) {
1540                 privptr->p_buff_ccw=
1541                         (void *)__get_free_pages(__GFP_DMA,
1542                         (int)pages_to_order_of_mag(ccw_pages_required ));
1543                 if (privptr->p_buff_ccw==NULL) {
1544                         return -ENOMEM;
1545                 }
1546                 privptr->p_buff_ccw_num=ccw_pages_required;
1547         }
1548         memset(privptr->p_buff_ccw, 0x00,
1549                 privptr->p_buff_ccw_num * PAGE_SIZE);
1550 
1551         /*
1552         *               obtain ending ccw block address
1553         *
1554         */
1555         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1556         real_address  = (__u32)__pa(privptr->p_end_ccw);
1557         /*                              Initialize ending CCW block       */
1558         p_endccw=privptr->p_end_ccw;
1559         p_endccw->real=real_address;
1560         p_endccw->write1=0x00;
1561         p_endccw->read1=0x00;
1562 
1563         /*      write1_nop1                                     */
1564         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1565         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1566         p_endccw->write1_nop1.count       = 1;
1567         p_endccw->write1_nop1.cda         = 0;
1568 
1569         /*      write1_nop2                                     */
1570         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1571         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1572         p_endccw->write1_nop2.count      = 1;
1573         p_endccw->write1_nop2.cda        = 0;
1574 
1575         /*      write2_nop1                                     */
1576         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1577         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1578         p_endccw->write2_nop1.count        = 1;
1579         p_endccw->write2_nop1.cda          = 0;
1580 
1581         /*      write2_nop2                                     */
1582         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1583         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1584         p_endccw->write2_nop2.count        = 1;
1585         p_endccw->write2_nop2.cda          = 0;
1586 
1587         /*      read1_nop1                                      */
1588         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1589         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1590         p_endccw->read1_nop1.count        = 1;
1591         p_endccw->read1_nop1.cda          = 0;
1592 
1593         /*      read1_nop2                                      */
1594         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1595         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1596         p_endccw->read1_nop2.count        = 1;
1597         p_endccw->read1_nop2.cda          = 0;
1598 
1599         /*      read2_nop1                                      */
1600         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1601         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1602         p_endccw->read2_nop1.count        = 1;
1603         p_endccw->read2_nop1.cda          = 0;
1604 
1605         /*      read2_nop2                                      */
1606         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1607         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1608         p_endccw->read2_nop2.count        = 1;
1609         p_endccw->read2_nop2.cda          = 0;
1610 
1611         /*
1612         *                               Build a chain of CCWs
1613         *
1614         */
1615         p_buff=privptr->p_buff_ccw;
1616 
1617         p_free_chain=NULL;
1618         for (i=0 ; i < ccw_pages_required; i++ ) {
1619                 real_address  = (__u32)__pa(p_buff);
1620                 p_buf=p_buff;
1621                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1622                         p_buf->next  = p_free_chain;
1623                         p_free_chain = p_buf;
1624                         p_buf->real=(__u32)__pa(p_buf);
1625                         ++p_buf;
1626                 }
1627                 p_buff+=PAGE_SIZE;
1628         }
1629         /*
1630         *                               Initialize ClawSignalBlock
1631         *
1632         */
1633         if (privptr->p_claw_signal_blk==NULL) {
1634                 privptr->p_claw_signal_blk=p_free_chain;
1635                 p_free_chain=p_free_chain->next;
1636                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1637                 pClawH->length=0xffff;
1638                 pClawH->opcode=0xff;
1639                 pClawH->flag=CLAW_BUSY;
1640         }
1641 
1642         /*
1643         *               allocate write_pages_required and add to free chain
1644         */
1645         if (privptr->p_buff_write==NULL) {
1646             if (privptr->p_env->write_size < PAGE_SIZE) {
1647                 privptr->p_buff_write=
1648                         (void *)__get_free_pages(__GFP_DMA,
1649                         (int)pages_to_order_of_mag(claw_write_pages ));
1650                 if (privptr->p_buff_write==NULL) {
1651                         privptr->p_buff_ccw=NULL;
1652                         return -ENOMEM;
1653                 }
1654                 /*
1655                 *                               Build CLAW write free chain
1656                 *
1657                 */
1658 
1659                 memset(privptr->p_buff_write, 0x00,
1660                         ccw_pages_required * PAGE_SIZE);
1661                 privptr->p_write_free_chain=NULL;
1662 
1663                 p_buff=privptr->p_buff_write;
1664 
1665                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1666                         p_buf        = p_free_chain;      /*  get a CCW */
1667                         p_free_chain = p_buf->next;
1668                         p_buf->next  =privptr->p_write_free_chain;
1669                         privptr->p_write_free_chain = p_buf;
1670                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1671                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1672                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1673                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1674                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1675                         p_buf-> w_read_FF.count   = 1;
1676                         p_buf-> w_read_FF.cda     =
1677                                 (__u32)__pa(&p_buf-> header.flag);
1678                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1679                         p_buf-> w_TIC_1.flags      = 0;
1680                         p_buf-> w_TIC_1.count      = 0;
1681 
1682                         if (((unsigned long)p_buff +
1683                                             privptr->p_env->write_size) >=
1684                            ((unsigned long)(p_buff+2*
1685                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1686                                 p_buff = p_buff+privptr->p_env->write_size;
1687                         }
1688                 }
1689            }
1690            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1691            {
1692                privptr->p_write_free_chain=NULL;
1693                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1694                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1695                         (int)pages_to_order_of_mag(
1696                         privptr->p_buff_pages_perwrite) );
1697                    if (p_buff==NULL) {
1698                         free_pages((unsigned long)privptr->p_buff_ccw,
1699                               (int)pages_to_order_of_mag(
1700                                         privptr->p_buff_ccw_num));
1701                         privptr->p_buff_ccw=NULL;
1702                         p_buf=privptr->p_buff_write;
1703                         while (p_buf!=NULL) {
1704                                 free_pages((unsigned long)
1705                                         p_buf->p_buffer,
1706                                         (int)pages_to_order_of_mag(
1707                                         privptr->p_buff_pages_perwrite));
1708                                 p_buf=p_buf->next;
1709                         }
1710                         return -ENOMEM;
1711                    }  /* Error on get_pages   */
1712                    memset(p_buff, 0x00, privptr->p_env->write_size );
1713                    p_buf         = p_free_chain;
1714                    p_free_chain  = p_buf->next;
1715                    p_buf->next   = privptr->p_write_free_chain;
1716                    privptr->p_write_free_chain = p_buf;
1717                    privptr->p_buff_write = p_buf;
1718                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1719                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1720                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1721                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1722                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1723                    p_buf-> w_read_FF.count    = 1;
1724                    p_buf-> w_read_FF.cda      =
1725                         (__u32)__pa(&p_buf-> header.flag);
1726                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1727                    p_buf-> w_TIC_1.flags   = 0;
1728                    p_buf-> w_TIC_1.count   = 0;
1729                }  /* for all write_buffers   */
1730 
1731            }    /* else buffers are PAGE_SIZE or bigger */
1732 
1733         }
1734         privptr->p_buff_write_num=claw_write_pages;
1735         privptr->write_free_count=privptr->p_env->write_buffers;
1736 
1737 
1738         /*
1739         *               allocate read_pages_required and chain to free chain
1740         */
1741         if (privptr->p_buff_read==NULL) {
1742             if (privptr->p_env->read_size < PAGE_SIZE)  {
1743                 privptr->p_buff_read=
1744                         (void *)__get_free_pages(__GFP_DMA,
1745                         (int)pages_to_order_of_mag(claw_read_pages) );
1746                 if (privptr->p_buff_read==NULL) {
1747                         free_pages((unsigned long)privptr->p_buff_ccw,
1748                                 (int)pages_to_order_of_mag(
1749                                         privptr->p_buff_ccw_num));
1750                         /* free the write pages size is < page size  */
1751                         free_pages((unsigned long)privptr->p_buff_write,
1752                                 (int)pages_to_order_of_mag(
1753                                 privptr->p_buff_write_num));
1754                         privptr->p_buff_ccw=NULL;
1755                         privptr->p_buff_write=NULL;
1756                         return -ENOMEM;
1757                 }
1758                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1759                 privptr->p_buff_read_num=claw_read_pages;
1760                 /*
1761                 *                               Build CLAW read free chain
1762                 *
1763                 */
1764                 p_buff=privptr->p_buff_read;
1765                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1766                         p_buf        = p_free_chain;
1767                         p_free_chain = p_buf->next;
1768 
1769                         if (p_last_CCWB==NULL) {
1770                                 p_buf->next=NULL;
1771                                 real_TIC_address=0;
1772                                 p_last_CCWB=p_buf;
1773                         }
1774                         else {
1775                                 p_buf->next=p_first_CCWB;
1776                                 real_TIC_address=
1777                                 (__u32)__pa(&p_first_CCWB -> read );
1778                         }
1779 
1780                         p_first_CCWB=p_buf;
1781 
1782                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1783                         /*  initialize read command */
1784                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1785                         p_buf-> read.cda = (__u32)__pa(p_buff);
1786                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1787                         p_buf-> read.count       = privptr->p_env->read_size;
1788 
1789                         /*  initialize read_h command */
1790                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1791                         p_buf-> read_h.cda =
1792                                 (__u32)__pa(&(p_buf->header));
1793                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1794                         p_buf-> read_h.count      = sizeof(struct clawh);
1795 
1796                         /*  initialize Signal command */
1797                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1798                         p_buf-> signal.cda =
1799                                 (__u32)__pa(&(pClawH->flag));
1800                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1801                         p_buf-> signal.count     = 1;
1802 
1803                         /*  initialize r_TIC_1 command */
1804                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1805                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1806                         p_buf-> r_TIC_1.flags = 0;
1807                         p_buf-> r_TIC_1.count      = 0;
1808 
1809                         /*  initialize r_read_FF command */
1810                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1811                         p_buf-> r_read_FF.cda =
1812                                 (__u32)__pa(&(pClawH->flag));
1813                         p_buf-> r_read_FF.flags =
1814                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1815                         p_buf-> r_read_FF.count    = 1;
1816 
1817                         /*    initialize r_TIC_2          */
1818                         memcpy(&p_buf->r_TIC_2,
1819                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1820 
1821                         /*     initialize Header     */
1822                         p_buf->header.length=0xffff;
1823                         p_buf->header.opcode=0xff;
1824                         p_buf->header.flag=CLAW_PENDING;
1825 
1826                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1827                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1828                                  -1)
1829                            & PAGE_MASK)) {
1830                                 p_buff= p_buff+privptr->p_env->read_size;
1831                         }
1832                         else {
1833                                 p_buff=
1834                                 (void *)((unsigned long)
1835                                         (p_buff+2*(privptr->p_env->read_size)-1)
1836                                          & PAGE_MASK) ;
1837                         }
1838                 }   /* for read_buffers   */
1839           }         /* read_size < PAGE_SIZE  */
1840           else {  /* read Size >= PAGE_SIZE  */
1841                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1842                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1843                                 (int)pages_to_order_of_mag(
1844                                         privptr->p_buff_pages_perread));
1845                         if (p_buff==NULL) {
1846                                 free_pages((unsigned long)privptr->p_buff_ccw,
1847                                         (int)pages_to_order_of_mag(privptr->
1848                                         p_buff_ccw_num));
1849                                 /* free the write pages  */
1850                                 p_buf=privptr->p_buff_write;
1851                                 while (p_buf!=NULL) {
1852                                         free_pages(
1853                                             (unsigned long)p_buf->p_buffer,
1854                                             (int)pages_to_order_of_mag(
1855                                             privptr->p_buff_pages_perwrite));
1856                                         p_buf=p_buf->next;
1857                                 }
1858                                 /* free any read pages already alloc  */
1859                                 p_buf=privptr->p_buff_read;
1860                                 while (p_buf!=NULL) {
1861                                         free_pages(
1862                                             (unsigned long)p_buf->p_buffer,
1863                                             (int)pages_to_order_of_mag(
1864                                              privptr->p_buff_pages_perread));
1865                                         p_buf=p_buf->next;
1866                                 }
1867                                 privptr->p_buff_ccw=NULL;
1868                                 privptr->p_buff_write=NULL;
1869                                 return -ENOMEM;
1870                         }
1871                         memset(p_buff, 0x00, privptr->p_env->read_size);
1872                         p_buf        = p_free_chain;
1873                         privptr->p_buff_read = p_buf;
1874                         p_free_chain = p_buf->next;
1875 
1876                         if (p_last_CCWB==NULL) {
1877                                 p_buf->next=NULL;
1878                                 real_TIC_address=0;
1879                                 p_last_CCWB=p_buf;
1880                         }
1881                         else {
1882                                 p_buf->next=p_first_CCWB;
1883                                 real_TIC_address=
1884                                         (addr_t)__pa(
1885                                                 &p_first_CCWB -> read );
1886                         }
1887 
1888                         p_first_CCWB=p_buf;
1889                                 /* save buff address */
1890                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1891                         /*  initialize read command */
1892                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1893                         p_buf-> read.cda = (__u32)__pa(p_buff);
1894                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1895                         p_buf-> read.count       = privptr->p_env->read_size;
1896 
1897                         /*  initialize read_h command */
1898                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1899                         p_buf-> read_h.cda =
1900                                 (__u32)__pa(&(p_buf->header));
1901                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1902                         p_buf-> read_h.count      = sizeof(struct clawh);
1903 
1904                         /*  initialize Signal command */
1905                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1906                         p_buf-> signal.cda =
1907                                 (__u32)__pa(&(pClawH->flag));
1908                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1909                         p_buf-> signal.count     = 1;
1910 
1911                         /*  initialize r_TIC_1 command */
1912                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1913                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1914                         p_buf-> r_TIC_1.flags = 0;
1915                         p_buf-> r_TIC_1.count      = 0;
1916 
1917                         /*  initialize r_read_FF command */
1918                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1919                         p_buf-> r_read_FF.cda =
1920                                 (__u32)__pa(&(pClawH->flag));
1921                         p_buf-> r_read_FF.flags =
1922                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1923                         p_buf-> r_read_FF.count    = 1;
1924 
1925                         /*    initialize r_TIC_2          */
1926                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1927                                 sizeof(struct ccw1));
1928 
1929                         /*     initialize Header     */
1930                         p_buf->header.length=0xffff;
1931                         p_buf->header.opcode=0xff;
1932                         p_buf->header.flag=CLAW_PENDING;
1933 
1934                 }    /* For read_buffers   */
1935           }     /*  read_size >= PAGE_SIZE   */
1936         }       /*  pBuffread = NULL */
1937         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1938         privptr->buffs_alloc = 1;
1939 
1940         return 0;
1941 }    /*    end of init_ccw_bk */
1942 
1943 /*-------------------------------------------------------------------*
1944 *                                                                    *
1945 *       probe_error                                                  *
1946 *                                                                    *
1947 *--------------------------------------------------------------------*/
1948 
1949 static void
1950 probe_error( struct ccwgroup_device *cgdev)
1951 {
1952         struct claw_privbk *privptr;
1953 
1954         CLAW_DBF_TEXT(4, trace, "proberr");
1955         privptr = dev_get_drvdata(&cgdev->dev);
1956         if (privptr != NULL) {
1957                 dev_set_drvdata(&cgdev->dev, NULL);
1958                 kfree(privptr->p_env);
1959                 kfree(privptr->p_mtc_envelope);
1960                 kfree(privptr);
1961         }
1962 }    /*    probe_error    */
1963 
1964 /*-------------------------------------------------------------------*
1965 *    claw_process_control                                            *
1966 *                                                                    *
1967 *                                                                    *
1968 *--------------------------------------------------------------------*/
1969 
1970 static int
1971 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1972 {
1973 
1974         struct clawbuf *p_buf;
1975         struct clawctl  ctlbk;
1976         struct clawctl *p_ctlbk;
1977         char    temp_host_name[8];
1978         char    temp_ws_name[8];
1979         struct claw_privbk *privptr;
1980         struct claw_env *p_env;
1981         struct sysval *p_sysval;
1982         struct conncmd *p_connect=NULL;
1983         int rc;
1984         struct chbk *p_ch = NULL;
1985         struct device *tdev;
1986         CLAW_DBF_TEXT(2, setup, "clw_cntl");
1987         udelay(1000);  /* Wait a ms for the control packets to
1988                         *catch up to each other */
1989         privptr = dev->ml_priv;
1990         p_env=privptr->p_env;
1991         tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
1992         memcpy( &temp_host_name, p_env->host_name, 8);
1993         memcpy( &temp_ws_name, p_env->adapter_name , 8);
1994         dev_info(tdev, "%s: CLAW device %.8s: "
1995                 "Received Control Packet\n",
1996                 dev->name, temp_ws_name);
1997         if (privptr->release_pend==1) {
1998                 return 0;
1999         }
2000         p_buf=p_ccw->p_buffer;
2001         p_ctlbk=&ctlbk;
2002         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2003                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2004         } else {
2005                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2006         }
2007         switch (p_ctlbk->command)
2008         {
2009         case SYSTEM_VALIDATE_REQUEST:
2010                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2011                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2012                                 CLAW_RC_WRONG_VERSION);
2013                         dev_warn(tdev, "The communication peer of %s"
2014                                 " uses an incorrect API version %d\n",
2015                                 dev->name, p_ctlbk->version);
2016                 }
2017                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2018                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2019                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2020                         "Host name=%.8s\n",
2021                         dev->name, p_ctlbk->version,
2022                         p_ctlbk->linkid,
2023                         p_ctlbk->correlator,
2024                         p_sysval->WS_name,
2025                         p_sysval->host_name);
2026                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2027                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2028                                 CLAW_RC_NAME_MISMATCH);
2029                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2030                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2031                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2032                         dev_warn(tdev,
2033                                 "Host name %s for %s does not match the"
2034                                 " remote adapter name %s\n",
2035                                 p_sysval->host_name,
2036                                 dev->name,
2037                                 temp_host_name);
2038                 }
2039                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2040                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2041                                 CLAW_RC_NAME_MISMATCH);
2042                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2043                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2044                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2045                         dev_warn(tdev, "Adapter name %s for %s does not match"
2046                                 " the remote host name %s\n",
2047                                 p_sysval->WS_name,
2048                                 dev->name,
2049                                 temp_ws_name);
2050                 }
2051                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2052                     (p_env->packing == 0)) {
2053                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2054                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2055                         dev_warn(tdev,
2056                                 "The local write buffer is smaller than the"
2057                                 " remote read buffer\n");
2058                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2059                 }
2060                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2061                     (p_env->packing == 0)) {
2062                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2063                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2064                         dev_warn(tdev,
2065                                 "The local read buffer is smaller than the"
2066                                 " remote write buffer\n");
2067                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2068                 }
2069                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2070                 dev_info(tdev,
2071                         "CLAW device %.8s: System validate"
2072                         " completed.\n", temp_ws_name);
2073                 dev_info(tdev,
2074                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2075                         dev->name, p_sysval->read_frame_size,
2076                         p_sysval->write_frame_size);
2077                 privptr->system_validate_comp = 1;
2078                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2079                         p_env->packing = PACKING_ASK;
2080                 claw_strt_conn_req(dev);
2081                 break;
2082         case SYSTEM_VALIDATE_RESPONSE:
2083                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2084                 dev_info(tdev,
2085                         "Settings for %s validated (version=%d, "
2086                         "remote device=%d, rc=%d, adapter name=%.8s, "
2087                         "host name=%.8s)\n",
2088                         dev->name,
2089                         p_ctlbk->version,
2090                         p_ctlbk->correlator,
2091                         p_ctlbk->rc,
2092                         p_sysval->WS_name,
2093                         p_sysval->host_name);
2094                 switch (p_ctlbk->rc) {
2095                 case 0:
2096                         dev_info(tdev, "%s: CLAW device "
2097                                 "%.8s: System validate completed.\n",
2098                                 dev->name, temp_ws_name);
2099                         if (privptr->system_validate_comp == 0)
2100                                 claw_strt_conn_req(dev);
2101                         privptr->system_validate_comp = 1;
2102                         break;
2103                 case CLAW_RC_NAME_MISMATCH:
2104                         dev_warn(tdev, "Validating %s failed because of"
2105                                 " a host or adapter name mismatch\n",
2106                                 dev->name);
2107                         break;
2108                 case CLAW_RC_WRONG_VERSION:
2109                         dev_warn(tdev, "Validating %s failed because of a"
2110                                 " version conflict\n",
2111                                 dev->name);
2112                         break;
2113                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2114                         dev_warn(tdev, "Validating %s failed because of a"
2115                                 " frame size conflict\n",
2116                                 dev->name);
2117                         break;
2118                 default:
2119                         dev_warn(tdev, "The communication peer of %s rejected"
2120                                 " the connection\n",
2121                                  dev->name);
2122                         break;
2123                 }
2124                 break;
2125 
2126         case CONNECTION_REQUEST:
2127                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2128                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2129                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2130                         dev->name,
2131                         p_ctlbk->version,
2132                         p_ctlbk->linkid,
2133                         p_ctlbk->correlator,
2134                         p_connect->host_name,
2135                         p_connect->WS_name);
2136                 if (privptr->active_link_ID != 0) {
2137                         claw_snd_disc(dev, p_ctlbk);
2138                         dev_info(tdev, "%s rejected a connection request"
2139                                 " because it is already active\n",
2140                                 dev->name);
2141                 }
2142                 if (p_ctlbk->linkid != 1) {
2143                         claw_snd_disc(dev, p_ctlbk);
2144                         dev_info(tdev, "%s rejected a request to open multiple"
2145                                 " connections\n",
2146                                 dev->name);
2147                 }
2148                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2149                 if (rc != 0) {
2150                         claw_snd_disc(dev, p_ctlbk);
2151                         dev_info(tdev, "%s rejected a connection request"
2152                                 " because of a type mismatch\n",
2153                                 dev->name);
2154                 }
2155                 claw_send_control(dev,
2156                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2157                         p_ctlbk->correlator,
2158                         0, p_connect->host_name,
2159                         p_connect->WS_name);
2160                 if (p_env->packing == PACKING_ASK) {
2161                         p_env->packing = PACK_SEND;
2162                         claw_snd_conn_req(dev, 0);
2163                 }
2164                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2165                         "completed link_id=%d.\n",
2166                         dev->name, temp_ws_name,
2167                         p_ctlbk->linkid);
2168                         privptr->active_link_ID = p_ctlbk->linkid;
2169                         p_ch = &privptr->channel[WRITE_CHANNEL];
2170                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2171                 break;
2172         case CONNECTION_RESPONSE:
2173                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2174                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2175                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2176                         dev->name,
2177                         p_ctlbk->version,
2178                         p_ctlbk->linkid,
2179                         p_ctlbk->correlator,
2180                         p_ctlbk->rc,
2181                         p_connect->host_name,
2182                         p_connect->WS_name);
2183 
2184                 if (p_ctlbk->rc != 0) {
2185                         dev_warn(tdev, "The communication peer of %s rejected"
2186                                 " a connection request\n",
2187                                 dev->name);
2188                         return 1;
2189                 }
2190                 rc = find_link(dev,
2191                         p_connect->host_name, p_connect->WS_name);
2192                 if (rc != 0) {
2193                         claw_snd_disc(dev, p_ctlbk);
2194                         dev_warn(tdev, "The communication peer of %s"
2195                                 " rejected a connection "
2196                                 "request because of a type mismatch\n",
2197                                  dev->name);
2198                 }
2199                 /* should be until CONNECTION_CONFIRM */
2200                 privptr->active_link_ID = -(p_ctlbk->linkid);
2201                 break;
2202         case CONNECTION_CONFIRM:
2203                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2204                 dev_info(tdev,
2205                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2206                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2207                         dev->name,
2208                         p_ctlbk->version,
2209                         p_ctlbk->linkid,
2210                         p_ctlbk->correlator,
2211                         p_connect->host_name,
2212                         p_connect->WS_name);
2213                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2214                         privptr->active_link_ID = p_ctlbk->linkid;
2215                         if (p_env->packing > PACKING_ASK) {
2216                                 dev_info(tdev,
2217                                 "%s: Confirmed Now packing\n", dev->name);
2218                                 p_env->packing = DO_PACKED;
2219                         }
2220                         p_ch = &privptr->channel[WRITE_CHANNEL];
2221                         wake_up(&p_ch->wait);
2222                 } else {
2223                         dev_warn(tdev, "Activating %s failed because of"
2224                                 " an incorrect link ID=%d\n",
2225                                 dev->name, p_ctlbk->linkid);
2226                         claw_snd_disc(dev, p_ctlbk);
2227                 }
2228                 break;
2229         case DISCONNECT:
2230                 dev_info(tdev, "%s: Disconnect: "
2231                         "Vers=%d,link_id=%d,Corr=%d\n",
2232                         dev->name, p_ctlbk->version,
2233                         p_ctlbk->linkid, p_ctlbk->correlator);
2234                 if ((p_ctlbk->linkid == 2) &&
2235                     (p_env->packing == PACK_SEND)) {
2236                         privptr->active_link_ID = 1;
2237                         p_env->packing = DO_PACKED;
2238                 } else
2239                         privptr->active_link_ID = 0;
2240                 break;
2241         case CLAW_ERROR:
2242                 dev_warn(tdev, "The communication peer of %s failed\n",
2243                         dev->name);
2244                 break;
2245         default:
2246                 dev_warn(tdev, "The communication peer of %s sent"
2247                         " an unknown command code\n",
2248                         dev->name);
2249                 break;
2250         }
2251 
2252         return 0;
2253 }   /*    end of claw_process_control    */
2254 
2255 
2256 /*-------------------------------------------------------------------*
2257 *               claw_send_control                                    *
2258 *                                                                    *
2259 *--------------------------------------------------------------------*/
2260 
2261 static int
2262 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2263          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2264 {
2265         struct claw_privbk              *privptr;
2266         struct clawctl                  *p_ctl;
2267         struct sysval                   *p_sysval;
2268         struct conncmd                  *p_connect;
2269         struct sk_buff                  *skb;
2270 
2271         CLAW_DBF_TEXT(2, setup, "sndcntl");
2272         privptr = dev->ml_priv;
2273         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2274 
2275         p_ctl->command=type;
2276         p_ctl->version=CLAW_VERSION_ID;
2277         p_ctl->linkid=link;
2278         p_ctl->correlator=correlator;
2279         p_ctl->rc=rc;
2280 
2281         p_sysval=(struct sysval *)&p_ctl->data;
2282         p_connect=(struct conncmd *)&p_ctl->data;
2283 
2284         switch (p_ctl->command) {
2285                 case SYSTEM_VALIDATE_REQUEST:
2286                 case SYSTEM_VALIDATE_RESPONSE:
2287                         memcpy(&p_sysval->host_name, local_name, 8);
2288                         memcpy(&p_sysval->WS_name, remote_name, 8);
2289                         if (privptr->p_env->packing > 0) {
2290                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2291                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2292                         } else {
2293                                 /* how big is the biggest group of packets */
2294                            p_sysval->read_frame_size =
2295                                 privptr->p_env->read_size;
2296                            p_sysval->write_frame_size =
2297                                 privptr->p_env->write_size;
2298                         }
2299                         memset(&p_sysval->reserved, 0x00, 4);
2300                         break;
2301                 case CONNECTION_REQUEST:
2302                 case CONNECTION_RESPONSE:
2303                 case CONNECTION_CONFIRM:
2304                 case DISCONNECT:
2305                         memcpy(&p_sysval->host_name, local_name, 8);
2306                         memcpy(&p_sysval->WS_name, remote_name, 8);
2307                         if (privptr->p_env->packing > 0) {
2308                         /* How big is the biggest packet */
2309                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2310                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2311                         } else {
2312                                 memset(&p_connect->reserved1, 0x00, 4);
2313                                 memset(&p_connect->reserved2, 0x00, 4);
2314                         }
2315                         break;
2316                 default:
2317                         break;
2318         }
2319 
2320         /*      write Control Record to the device                   */
2321 
2322 
2323         skb = dev_alloc_skb(sizeof(struct clawctl));
2324         if (!skb) {
2325                 return -ENOMEM;
2326         }
2327         memcpy(skb_put(skb, sizeof(struct clawctl)),
2328                 p_ctl, sizeof(struct clawctl));
2329         if (privptr->p_env->packing >= PACK_SEND)
2330                 claw_hw_tx(skb, dev, 1);
2331         else
2332                 claw_hw_tx(skb, dev, 0);
2333         return 0;
2334 }  /*   end of claw_send_control  */
2335 
2336 /*-------------------------------------------------------------------*
2337 *               claw_snd_conn_req                                    *
2338 *                                                                    *
2339 *--------------------------------------------------------------------*/
2340 static int
2341 claw_snd_conn_req(struct net_device *dev, __u8 link)
2342 {
2343         int                rc;
2344         struct claw_privbk *privptr = dev->ml_priv;
2345         struct clawctl     *p_ctl;
2346 
2347         CLAW_DBF_TEXT(2, setup, "snd_conn");
2348         rc = 1;
2349         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2350         p_ctl->linkid = link;
2351         if ( privptr->system_validate_comp==0x00 ) {
2352                 return rc;
2353         }
2354         if (privptr->p_env->packing == PACKING_ASK )
2355                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2356                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2357         if (privptr->p_env->packing == PACK_SEND)  {
2358                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2359                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2360         }
2361         if (privptr->p_env->packing == 0)
2362                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2363                         HOST_APPL_NAME, privptr->p_env->api_type);
2364         return rc;
2365 
2366 }  /*  end of claw_snd_conn_req */
2367 
2368 
2369 /*-------------------------------------------------------------------*
2370 *               claw_snd_disc                                        *
2371 *                                                                    *
2372 *--------------------------------------------------------------------*/
2373 
2374 static int
2375 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2376 {
2377         int rc;
2378         struct conncmd *  p_connect;
2379 
2380         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2381         p_connect=(struct conncmd *)&p_ctl->data;
2382 
2383         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2384                 p_ctl->correlator, 0,
2385                 p_connect->host_name, p_connect->WS_name);
2386         return rc;
2387 }     /*   end of claw_snd_disc    */
2388 
2389 
2390 /*-------------------------------------------------------------------*
2391 *               claw_snd_sys_validate_rsp                            *
2392 *                                                                    *
2393 *--------------------------------------------------------------------*/
2394 
2395 static int
2396 claw_snd_sys_validate_rsp(struct net_device *dev,
2397         struct clawctl *p_ctl, __u32 return_code)
2398 {
2399         struct claw_env *  p_env;
2400         struct claw_privbk *privptr;
2401         int    rc;
2402 
2403         CLAW_DBF_TEXT(2, setup, "chkresp");
2404         privptr = dev->ml_priv;
2405         p_env=privptr->p_env;
2406         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2407                 p_ctl->linkid,
2408                 p_ctl->correlator,
2409                 return_code,
2410                 p_env->host_name,
2411                 p_env->adapter_name  );
2412         return rc;
2413 }     /*    end of claw_snd_sys_validate_rsp    */
2414 
2415 /*-------------------------------------------------------------------*
2416 *               claw_strt_conn_req                                   *
2417 *                                                                    *
2418 *--------------------------------------------------------------------*/
2419 
2420 static int
2421 claw_strt_conn_req(struct net_device *dev )
2422 {
2423         int rc;
2424 
2425         CLAW_DBF_TEXT(2, setup, "conn_req");
2426         rc=claw_snd_conn_req(dev, 1);
2427         return rc;
2428 }    /*   end of claw_strt_conn_req   */
2429 
2430 
2431 
2432 /*-------------------------------------------------------------------*
2433  *   claw_stats                                                      *
2434  *-------------------------------------------------------------------*/
2435 
2436 static struct
2437 net_device_stats *claw_stats(struct net_device *dev)
2438 {
2439         struct claw_privbk *privptr;
2440 
2441         CLAW_DBF_TEXT(4, trace, "stats");
2442         privptr = dev->ml_priv;
2443         return &privptr->stats;
2444 }     /*   end of claw_stats   */
2445 
2446 
2447 /*-------------------------------------------------------------------*
2448 *       unpack_read                                                  *
2449 *                                                                    *
2450 *--------------------------------------------------------------------*/
2451 static void
2452 unpack_read(struct net_device *dev )
2453 {
2454         struct sk_buff *skb;
2455         struct claw_privbk *privptr;
2456         struct claw_env    *p_env;
2457         struct ccwbk    *p_this_ccw;
2458         struct ccwbk    *p_first_ccw;
2459         struct ccwbk    *p_last_ccw;
2460         struct clawph   *p_packh;
2461         void            *p_packd;
2462         struct clawctl  *p_ctlrec=NULL;
2463         struct device   *p_dev;
2464 
2465         __u32   len_of_data;
2466         __u32   pack_off;
2467         __u8    link_num;
2468         __u8    mtc_this_frm=0;
2469         __u32   bytes_to_mov;
2470         int     i=0;
2471         int     p=0;
2472 
2473         CLAW_DBF_TEXT(4, trace, "unpkread");
2474         p_first_ccw=NULL;
2475         p_last_ccw=NULL;
2476         p_packh=NULL;
2477         p_packd=NULL;
2478         privptr = dev->ml_priv;
2479 
2480         p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2481         p_env = privptr->p_env;
2482         p_this_ccw=privptr->p_read_active_first;
2483         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2484                 pack_off = 0;
2485                 p = 0;
2486                 p_this_ccw->header.flag=CLAW_PENDING;
2487                 privptr->p_read_active_first=p_this_ccw->next;
2488                 p_this_ccw->next=NULL;
2489                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2490                 if ((p_env->packing == PACK_SEND) &&
2491                     (p_packh->len == 32)           &&
2492                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2493                         p_packh++;  /* peek past pack header */
2494                         p_ctlrec = (struct clawctl *)p_packh;
2495                         p_packh--;  /* un peek */
2496                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2497                             (p_ctlrec->command == CONNECTION_CONFIRM))
2498                                 p_env->packing = DO_PACKED;
2499                 }
2500                 if (p_env->packing == DO_PACKED)
2501                         link_num=p_packh->link_num;
2502                 else
2503                         link_num=p_this_ccw->header.opcode / 8;
2504                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2505                         mtc_this_frm=1;
2506                         if (p_this_ccw->header.length!=
2507                                 privptr->p_env->read_size ) {
2508                                 dev_warn(p_dev,
2509                                         "The communication peer of %s"
2510                                         " sent a faulty"
2511                                         " frame of length %02x\n",
2512                                         dev->name, p_this_ccw->header.length);
2513                         }
2514                 }
2515 
2516                 if (privptr->mtc_skipping) {
2517                         /*
2518                         *   We're in the mode of skipping past a
2519                         *   multi-frame message
2520                         *   that we can't process for some reason or other.
2521                         *   The first frame without the More-To-Come flag is
2522                         *   the last frame of the skipped message.
2523                         */
2524                         /*  in case of More-To-Come not set in this frame */
2525                         if (mtc_this_frm==0) {
2526                                 privptr->mtc_skipping=0; /* Ok, the end */
2527                                 privptr->mtc_logical_link=-1;
2528                         }
2529                         goto NextFrame;
2530                 }
2531 
2532                 if (link_num==0) {
2533                         claw_process_control(dev, p_this_ccw);
2534                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2535                         goto NextFrame;
2536                 }
2537 unpack_next:
2538                 if (p_env->packing == DO_PACKED) {
2539                         if (pack_off > p_env->read_size)
2540                                 goto NextFrame;
2541                         p_packd = p_this_ccw->p_buffer+pack_off;
2542                         p_packh = (struct clawph *) p_packd;
2543                         if ((p_packh->len == 0) || /* done with this frame? */
2544                             (p_packh->flag != 0))
2545                                 goto NextFrame;
2546                         bytes_to_mov = p_packh->len;
2547                         pack_off += bytes_to_mov+sizeof(struct clawph);
2548                         p++;
2549                 } else {
2550                         bytes_to_mov=p_this_ccw->header.length;
2551                 }
2552                 if (privptr->mtc_logical_link<0) {
2553 
2554                 /*
2555                 *  if More-To-Come is set in this frame then we don't know
2556                 *  length of entire message, and hence have to allocate
2557                 *  large buffer   */
2558 
2559                 /*      We are starting a new envelope  */
2560                 privptr->mtc_offset=0;
2561                         privptr->mtc_logical_link=link_num;
2562                 }
2563 
2564                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2565                         /*      error     */
2566                         privptr->stats.rx_frame_errors++;
2567                         goto NextFrame;
2568                 }
2569                 if (p_env->packing == DO_PACKED) {
2570                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2571                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2572 
2573                 } else  {
2574                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2575                                 p_this_ccw->p_buffer, bytes_to_mov);
2576                 }
2577                 if (mtc_this_frm==0) {
2578                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2579                         skb=dev_alloc_skb(len_of_data);
2580                         if (skb) {
2581                                 memcpy(skb_put(skb,len_of_data),
2582                                         privptr->p_mtc_envelope,
2583                                         len_of_data);
2584                                 skb->dev=dev;
2585                                 skb_reset_mac_header(skb);
2586                                 skb->protocol=htons(ETH_P_IP);
2587                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2588                                 privptr->stats.rx_packets++;
2589                                 privptr->stats.rx_bytes+=len_of_data;
2590                                 netif_rx(skb);
2591                         }
2592                         else {
2593                                 dev_info(p_dev, "Allocating a buffer for"
2594                                         " incoming data failed\n");
2595                                 privptr->stats.rx_dropped++;
2596                         }
2597                         privptr->mtc_offset=0;
2598                         privptr->mtc_logical_link=-1;
2599                 }
2600                 else {
2601                         privptr->mtc_offset+=bytes_to_mov;
2602                 }
2603                 if (p_env->packing == DO_PACKED)
2604                         goto unpack_next;
2605 NextFrame:
2606                 /*
2607                 *   Remove ThisCCWblock from active read queue, and add it
2608                 *   to queue of free blocks to be reused.
2609                 */
2610                 i++;
2611                 p_this_ccw->header.length=0xffff;
2612                 p_this_ccw->header.opcode=0xff;
2613                 /*
2614                 *       add this one to the free queue for later reuse
2615                 */
2616                 if (p_first_ccw==NULL) {
2617                         p_first_ccw = p_this_ccw;
2618                 }
2619                 else {
2620                         p_last_ccw->next = p_this_ccw;
2621                 }
2622                 p_last_ccw = p_this_ccw;
2623                 /*
2624                 *       chain to next block on active read queue
2625                 */
2626                 p_this_ccw = privptr->p_read_active_first;
2627                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2628         } /* end of while */
2629 
2630         /*      check validity                  */
2631 
2632         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2633         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2634         claw_strt_read(dev, LOCK_YES);
2635         return;
2636 }     /*  end of unpack_read   */
2637 
2638 /*-------------------------------------------------------------------*
2639 *       claw_strt_read                                               *
2640 *                                                                    *
2641 *--------------------------------------------------------------------*/
2642 static void
2643 claw_strt_read (struct net_device *dev, int lock )
2644 {
2645         int        rc = 0;
2646         __u32      parm;
2647         unsigned long  saveflags = 0;
2648         struct claw_privbk *privptr = dev->ml_priv;
2649         struct ccwbk*p_ccwbk;
2650         struct chbk *p_ch;
2651         struct clawh *p_clawh;
2652         p_ch = &privptr->channel[READ_CHANNEL];
2653 
2654         CLAW_DBF_TEXT(4, trace, "StRdNter");
2655         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2656         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2657 
2658         if ((privptr->p_write_active_first!=NULL &&
2659              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2660             (privptr->p_read_active_first!=NULL &&
2661              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2662                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2663         }
2664         if (lock==LOCK_YES) {
2665                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2666         }
2667         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2668                 CLAW_DBF_TEXT(4, trace, "HotRead");
2669                 p_ccwbk=privptr->p_read_active_first;
2670                 parm = (unsigned long) p_ch;
2671                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2672                                        0xff, 0);
2673                 if (rc != 0) {
2674                         ccw_check_return_code(p_ch->cdev, rc);
2675                 }
2676         }
2677         else {
2678                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2679         }
2680 
2681         if (lock==LOCK_YES) {
2682                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2683         }
2684         CLAW_DBF_TEXT(4, trace, "StRdExit");
2685         return;
2686 }       /*    end of claw_strt_read    */
2687 
2688 /*-------------------------------------------------------------------*
2689 *       claw_strt_out_IO                                             *
2690 *                                                                    *
2691 *--------------------------------------------------------------------*/
2692 
2693 static void
2694 claw_strt_out_IO( struct net_device *dev )
2695 {
2696         int                     rc = 0;
2697         unsigned long           parm;
2698         struct claw_privbk      *privptr;
2699         struct chbk             *p_ch;
2700         struct ccwbk    *p_first_ccw;
2701 
2702         if (!dev) {
2703                 return;
2704         }
2705         privptr = (struct claw_privbk *)dev->ml_priv;
2706         p_ch = &privptr->channel[WRITE_CHANNEL];
2707 
2708         CLAW_DBF_TEXT(4, trace, "strt_io");
2709         p_first_ccw=privptr->p_write_active_first;
2710 
2711         if (p_ch->claw_state == CLAW_STOP)
2712                 return;
2713         if (p_first_ccw == NULL) {
2714                 return;
2715         }
2716         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2717                 parm = (unsigned long) p_ch;
2718                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2719                 rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2720                                       0xff, 0);
2721                 if (rc != 0) {
2722                         ccw_check_return_code(p_ch->cdev, rc);
2723                 }
2724         }
2725         dev->trans_start = jiffies;
2726         return;
2727 }       /*    end of claw_strt_out_IO    */
2728 
2729 /*-------------------------------------------------------------------*
2730 *       Free write buffers                                           *
2731 *                                                                    *
2732 *--------------------------------------------------------------------*/
2733 
2734 static void
2735 claw_free_wrt_buf( struct net_device *dev )
2736 {
2737 
2738         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2739         struct ccwbk*p_this_ccw;
2740         struct ccwbk*p_next_ccw;
2741 
2742         CLAW_DBF_TEXT(4, trace, "freewrtb");
2743         /*  scan the write queue to free any completed write packets   */
2744         p_this_ccw=privptr->p_write_active_first;
2745         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2746         {
2747                 p_next_ccw = p_this_ccw->next;
2748                 if (((p_next_ccw!=NULL) &&
2749                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2750                     ((p_this_ccw == privptr->p_write_active_last) &&
2751                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2752                         /* The next CCW is OK or this is  */
2753                         /* the last CCW...free it   @A1A  */
2754                         privptr->p_write_active_first=p_this_ccw->next;
2755                         p_this_ccw->header.flag=CLAW_PENDING;
2756                         p_this_ccw->next=privptr->p_write_free_chain;
2757                         privptr->p_write_free_chain=p_this_ccw;
2758                         ++privptr->write_free_count;
2759                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2760                         p_this_ccw=privptr->p_write_active_first;
2761                         privptr->stats.tx_packets++;
2762                 }
2763                 else {
2764                         break;
2765                 }
2766         }
2767         if (privptr->write_free_count!=0) {
2768                 claw_clearbit_busy(TB_NOBUFFER,dev);
2769         }
2770         /*   whole chain removed?   */
2771         if (privptr->p_write_active_first==NULL) {
2772                 privptr->p_write_active_last=NULL;
2773         }
2774         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2775         return;
2776 }
2777 
2778 /*-------------------------------------------------------------------*
2779 *       claw free netdevice                                          *
2780 *                                                                    *
2781 *--------------------------------------------------------------------*/
2782 static void
2783 claw_free_netdevice(struct net_device * dev, int free_dev)
2784 {
2785         struct claw_privbk *privptr;
2786 
2787         CLAW_DBF_TEXT(2, setup, "free_dev");
2788         if (!dev)
2789                 return;
2790         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2791         privptr = dev->ml_priv;
2792         if (dev->flags & IFF_RUNNING)
2793                 claw_release(dev);
2794         if (privptr) {
2795                 privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2796         }
2797         dev->ml_priv = NULL;
2798 #ifdef MODULE
2799         if (free_dev) {
2800                 free_netdev(dev);
2801         }
2802 #endif
2803         CLAW_DBF_TEXT(2, setup, "free_ok");
2804 }
2805 
2806 /**
2807  * Claw init netdevice
2808  * Initialize everything of the net device except the name and the
2809  * channel structs.
2810  */
2811 static const struct net_device_ops claw_netdev_ops = {
2812         .ndo_open               = claw_open,
2813         .ndo_stop               = claw_release,
2814         .ndo_get_stats          = claw_stats,
2815         .ndo_start_xmit         = claw_tx,
2816         .ndo_change_mtu         = claw_change_mtu,
2817 };
2818 
2819 static void
2820 claw_init_netdevice(struct net_device * dev)
2821 {
2822         CLAW_DBF_TEXT(2, setup, "init_dev");
2823         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2824         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2825         dev->hard_header_len = 0;
2826         dev->addr_len = 0;
2827         dev->type = ARPHRD_SLIP;
2828         dev->tx_queue_len = 1300;
2829         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2830         dev->netdev_ops = &claw_netdev_ops;
2831         CLAW_DBF_TEXT(2, setup, "initok");
2832         return;
2833 }
2834 
2835 /**
2836  * Init a new channel in the privptr->channel[i].
2837  *
2838  * @param cdev  The ccw_device to be added.
2839  *
2840  * @return 0 on success, !0 on error.
2841  */
2842 static int
2843 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2844 {
2845         struct chbk *p_ch;
2846         struct ccw_dev_id dev_id;
2847 
2848         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2849         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2850         p_ch = &privptr->channel[i];
2851         p_ch->cdev = cdev;
2852         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2853         ccw_device_get_id(cdev, &dev_id);
2854         p_ch->devno = dev_id.devno;
2855         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2856                 return -ENOMEM;
2857         }
2858         return 0;
2859 }
2860 
2861 
2862 /**
2863  *
2864  * Setup an interface.
2865  *
2866  * @param cgdev  Device to be setup.
2867  *
2868  * @returns 0 on success, !0 on failure.
2869  */
2870 static int
2871 claw_new_device(struct ccwgroup_device *cgdev)
2872 {
2873         struct claw_privbk *privptr;
2874         struct claw_env *p_env;
2875         struct net_device *dev;
2876         int ret;
2877         struct ccw_dev_id dev_id;
2878 
2879         dev_info(&cgdev->dev, "add for %s\n",
2880                  dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2881         CLAW_DBF_TEXT(2, setup, "new_dev");
2882         privptr = dev_get_drvdata(&cgdev->dev);
2883         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2884         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2885         if (!privptr)
2886                 return -ENODEV;
2887         p_env = privptr->p_env;
2888         ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2889         p_env->devno[READ_CHANNEL] = dev_id.devno;
2890         ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2891         p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2892         ret = add_channel(cgdev->cdev[0],0,privptr);
2893         if (ret == 0)
2894                 ret = add_channel(cgdev->cdev[1],1,privptr);
2895         if (ret != 0) {
2896                 dev_warn(&cgdev->dev, "Creating a CLAW group device"
2897                         " failed with error code %d\n", ret);
2898                 goto out;
2899         }
2900         ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2901         if (ret != 0) {
2902                 dev_warn(&cgdev->dev,
2903                         "Setting the read subchannel online"
2904                         " failed with error code %d\n", ret);
2905                 goto out;
2906         }
2907         ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2908         if (ret != 0) {
2909                 dev_warn(&cgdev->dev,
2910                         "Setting the write subchannel online "
2911                         "failed with error code %d\n", ret);
2912                 goto out;
2913         }
2914         dev = alloc_netdev(0, "claw%d", NET_NAME_UNKNOWN, claw_init_netdevice);
2915         if (!dev) {
2916                 dev_warn(&cgdev->dev,
2917                         "Activating the CLAW device failed\n");
2918                 goto out;
2919         }
2920         dev->ml_priv = privptr;
2921         dev_set_drvdata(&cgdev->dev, privptr);
2922         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2923         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2924         /* sysfs magic */
2925         SET_NETDEV_DEV(dev, &cgdev->dev);
2926         if (register_netdev(dev) != 0) {
2927                 claw_free_netdevice(dev, 1);
2928                 CLAW_DBF_TEXT(2, trace, "regfail");
2929                 goto out;
2930         }
2931         dev->flags &=~IFF_RUNNING;
2932         if (privptr->buffs_alloc == 0) {
2933                 ret=init_ccw_bk(dev);
2934                 if (ret !=0) {
2935                         unregister_netdev(dev);
2936                         claw_free_netdevice(dev,1);
2937                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2938                         goto out;
2939                 }
2940         }
2941         privptr->channel[READ_CHANNEL].ndev = dev;
2942         privptr->channel[WRITE_CHANNEL].ndev = dev;
2943         privptr->p_env->ndev = dev;
2944 
2945         dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2946                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2947                 dev->name, p_env->read_size,
2948                 p_env->write_size, p_env->read_buffers,
2949                 p_env->write_buffers, p_env->devno[READ_CHANNEL],
2950                 p_env->devno[WRITE_CHANNEL]);
2951         dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2952                 ":%.8s api_type: %.8s\n",
2953                 dev->name, p_env->host_name,
2954                 p_env->adapter_name , p_env->api_type);
2955         return 0;
2956 out:
2957         ccw_device_set_offline(cgdev->cdev[1]);
2958         ccw_device_set_offline(cgdev->cdev[0]);
2959         return -ENODEV;
2960 }
2961 
2962 static void
2963 claw_purge_skb_queue(struct sk_buff_head *q)
2964 {
2965         struct sk_buff *skb;
2966 
2967         CLAW_DBF_TEXT(4, trace, "purgque");
2968         while ((skb = skb_dequeue(q))) {
2969                 atomic_dec(&skb->users);
2970                 dev_kfree_skb_any(skb);
2971         }
2972 }
2973 
2974 /**
2975  * Shutdown an interface.
2976  *
2977  * @param cgdev  Device to be shut down.
2978  *
2979  * @returns 0 on success, !0 on failure.
2980  */
2981 static int
2982 claw_shutdown_device(struct ccwgroup_device *cgdev)
2983 {
2984         struct claw_privbk *priv;
2985         struct net_device *ndev;
2986         int ret = 0;
2987 
2988         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2989         priv = dev_get_drvdata(&cgdev->dev);
2990         if (!priv)
2991                 return -ENODEV;
2992         ndev = priv->channel[READ_CHANNEL].ndev;
2993         if (ndev) {
2994                 /* Close the device */
2995                 dev_info(&cgdev->dev, "%s: shutting down\n",
2996                         ndev->name);
2997                 if (ndev->flags & IFF_RUNNING)
2998                         ret = claw_release(ndev);
2999                 ndev->flags &=~IFF_RUNNING;
3000                 unregister_netdev(ndev);
3001                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3002                 claw_free_netdevice(ndev, 1);
3003                 priv->channel[READ_CHANNEL].ndev = NULL;
3004                 priv->channel[WRITE_CHANNEL].ndev = NULL;
3005                 priv->p_env->ndev = NULL;
3006         }
3007         ccw_device_set_offline(cgdev->cdev[1]);
3008         ccw_device_set_offline(cgdev->cdev[0]);
3009         return ret;
3010 }
3011 
3012 static void
3013 claw_remove_device(struct ccwgroup_device *cgdev)
3014 {
3015         struct claw_privbk *priv;
3016 
3017         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3018         priv = dev_get_drvdata(&cgdev->dev);
3019         dev_info(&cgdev->dev, " will be removed.\n");
3020         if (cgdev->state == CCWGROUP_ONLINE)
3021                 claw_shutdown_device(cgdev);
3022         kfree(priv->p_mtc_envelope);
3023         priv->p_mtc_envelope=NULL;
3024         kfree(priv->p_env);
3025         priv->p_env=NULL;
3026         kfree(priv->channel[0].irb);
3027         priv->channel[0].irb=NULL;
3028         kfree(priv->channel[1].irb);
3029         priv->channel[1].irb=NULL;
3030         kfree(priv);
3031         dev_set_drvdata(&cgdev->dev, NULL);
3032         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3033         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3034         put_device(&cgdev->dev);
3035 
3036         return;
3037 }
3038 
3039 
3040 /*
3041  * sysfs attributes
3042  */
3043 static ssize_t
3044 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3045 {
3046         struct claw_privbk *priv;
3047         struct claw_env *  p_env;
3048 
3049         priv = dev_get_drvdata(dev);
3050         if (!priv)
3051                 return -ENODEV;
3052         p_env = priv->p_env;
3053         return sprintf(buf, "%s\n",p_env->host_name);
3054 }
3055 
3056 static ssize_t
3057 claw_hname_write(struct device *dev, struct device_attribute *attr,
3058          const char *buf, size_t count)
3059 {
3060         struct claw_privbk *priv;
3061         struct claw_env *  p_env;
3062 
3063         priv = dev_get_drvdata(dev);
3064         if (!priv)
3065                 return -ENODEV;
3066         p_env = priv->p_env;
3067         if (count > MAX_NAME_LEN+1)
3068                 return -EINVAL;
3069         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3070         strncpy(p_env->host_name,buf, count);
3071         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3072         p_env->host_name[MAX_NAME_LEN] = 0x00;
3073         CLAW_DBF_TEXT(2, setup, "HstnSet");
3074         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3075 
3076         return count;
3077 }
3078 
3079 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3080 
3081 static ssize_t
3082 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3083 {
3084         struct claw_privbk *priv;
3085         struct claw_env *  p_env;
3086 
3087         priv = dev_get_drvdata(dev);
3088         if (!priv)
3089                 return -ENODEV;
3090         p_env = priv->p_env;
3091         return sprintf(buf, "%s\n", p_env->adapter_name);
3092 }
3093 
3094 static ssize_t
3095 claw_adname_write(struct device *dev, struct device_attribute *attr,
3096          const char *buf, size_t count)
3097 {
3098         struct claw_privbk *priv;
3099         struct claw_env *  p_env;
3100 
3101         priv = dev_get_drvdata(dev);
3102         if (!priv)
3103                 return -ENODEV;
3104         p_env = priv->p_env;
3105         if (count > MAX_NAME_LEN+1)
3106                 return -EINVAL;
3107         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3108         strncpy(p_env->adapter_name,buf, count);
3109         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3110         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3111         CLAW_DBF_TEXT(2, setup, "AdnSet");
3112         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3113 
3114         return count;
3115 }
3116 
3117 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3118 
3119 static ssize_t
3120 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3121 {
3122         struct claw_privbk *priv;
3123         struct claw_env *  p_env;
3124 
3125         priv = dev_get_drvdata(dev);
3126         if (!priv)
3127                 return -ENODEV;
3128         p_env = priv->p_env;
3129         return sprintf(buf, "%s\n",
3130                        p_env->api_type);
3131 }
3132 
3133 static ssize_t
3134 claw_apname_write(struct device *dev, struct device_attribute *attr,
3135         const char *buf, size_t count)
3136 {
3137         struct claw_privbk *priv;
3138         struct claw_env *  p_env;
3139 
3140         priv = dev_get_drvdata(dev);
3141         if (!priv)
3142                 return -ENODEV;
3143         p_env = priv->p_env;
3144         if (count > MAX_NAME_LEN+1)
3145                 return -EINVAL;
3146         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3147         strncpy(p_env->api_type,buf, count);
3148         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3149         p_env->api_type[MAX_NAME_LEN] = 0x00;
3150         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3151                 p_env->read_size=DEF_PACK_BUFSIZE;
3152                 p_env->write_size=DEF_PACK_BUFSIZE;
3153                 p_env->packing=PACKING_ASK;
3154                 CLAW_DBF_TEXT(2, setup, "PACKING");
3155         }
3156         else {
3157                 p_env->packing=0;
3158                 p_env->read_size=CLAW_FRAME_SIZE;
3159                 p_env->write_size=CLAW_FRAME_SIZE;
3160                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3161         }
3162         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3163         return count;
3164 }
3165 
3166 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3167 
3168 static ssize_t
3169 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3170 {
3171         struct claw_privbk *priv;
3172         struct claw_env * p_env;
3173 
3174         priv = dev_get_drvdata(dev);
3175         if (!priv)
3176                 return -ENODEV;
3177         p_env = priv->p_env;
3178         return sprintf(buf, "%d\n", p_env->write_buffers);
3179 }
3180 
3181 static ssize_t
3182 claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3183         const char *buf, size_t count)
3184 {
3185         struct claw_privbk *priv;
3186         struct claw_env *  p_env;
3187         int nnn,max;
3188 
3189         priv = dev_get_drvdata(dev);
3190         if (!priv)
3191                 return -ENODEV;
3192         p_env = priv->p_env;
3193         sscanf(buf, "%i", &nnn);
3194         if (p_env->packing) {
3195                 max = 64;
3196         }
3197         else {
3198                 max = 512;
3199         }
3200         if ((nnn > max ) || (nnn < 2))
3201                 return -EINVAL;
3202         p_env->write_buffers = nnn;
3203         CLAW_DBF_TEXT(2, setup, "Wbufset");
3204         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3205         return count;
3206 }
3207 
3208 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3209 
3210 static ssize_t
3211 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3212 {
3213         struct claw_privbk *priv;
3214         struct claw_env *  p_env;
3215 
3216         priv = dev_get_drvdata(dev);
3217         if (!priv)
3218                 return -ENODEV;
3219         p_env = priv->p_env;
3220         return sprintf(buf, "%d\n", p_env->read_buffers);
3221 }
3222 
3223 static ssize_t
3224 claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3225         const char *buf, size_t count)
3226 {
3227         struct claw_privbk *priv;
3228         struct claw_env *p_env;
3229         int nnn,max;
3230 
3231         priv = dev_get_drvdata(dev);
3232         if (!priv)
3233                 return -ENODEV;
3234         p_env = priv->p_env;
3235         sscanf(buf, "%i", &nnn);
3236         if (p_env->packing) {
3237                 max = 64;
3238         }
3239         else {
3240                 max = 512;
3241         }
3242         if ((nnn > max ) || (nnn < 2))
3243                 return -EINVAL;
3244         p_env->read_buffers = nnn;
3245         CLAW_DBF_TEXT(2, setup, "Rbufset");
3246         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3247         return count;
3248 }
3249 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3250 
3251 static struct attribute *claw_attr[] = {
3252         &dev_attr_read_buffer.attr,
3253         &dev_attr_write_buffer.attr,
3254         &dev_attr_adapter_name.attr,
3255         &dev_attr_api_type.attr,
3256         &dev_attr_host_name.attr,
3257         NULL,
3258 };
3259 static struct attribute_group claw_attr_group = {
3260         .attrs = claw_attr,
3261 };
3262 static const struct attribute_group *claw_attr_groups[] = {
3263         &claw_attr_group,
3264         NULL,
3265 };
3266 static const struct device_type claw_devtype = {
3267         .name = "claw",
3268         .groups = claw_attr_groups,
3269 };
3270 
3271 /*----------------------------------------------------------------*
3272  *   claw_probe                                                   *
3273  *      this function is called for each CLAW device.             *
3274  *----------------------------------------------------------------*/
3275 static int claw_probe(struct ccwgroup_device *cgdev)
3276 {
3277         struct claw_privbk *privptr = NULL;
3278 
3279         CLAW_DBF_TEXT(2, setup, "probe");
3280         if (!get_device(&cgdev->dev))
3281                 return -ENODEV;
3282         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
3283         dev_set_drvdata(&cgdev->dev, privptr);
3284         if (privptr == NULL) {
3285                 probe_error(cgdev);
3286                 put_device(&cgdev->dev);
3287                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3288                 return -ENOMEM;
3289         }
3290         privptr->p_mtc_envelope = kzalloc(MAX_ENVELOPE_SIZE, GFP_KERNEL);
3291         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
3292         if ((privptr->p_mtc_envelope == NULL) || (privptr->p_env == NULL)) {
3293                 probe_error(cgdev);
3294                 put_device(&cgdev->dev);
3295                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3296                 return -ENOMEM;
3297         }
3298         memcpy(privptr->p_env->adapter_name, WS_NAME_NOT_DEF, 8);
3299         memcpy(privptr->p_env->host_name, WS_NAME_NOT_DEF, 8);
3300         memcpy(privptr->p_env->api_type, WS_NAME_NOT_DEF, 8);
3301         privptr->p_env->packing = 0;
3302         privptr->p_env->write_buffers = 5;
3303         privptr->p_env->read_buffers = 5;
3304         privptr->p_env->read_size = CLAW_FRAME_SIZE;
3305         privptr->p_env->write_size = CLAW_FRAME_SIZE;
3306         privptr->p_env->p_priv = privptr;
3307         cgdev->cdev[0]->handler = claw_irq_handler;
3308         cgdev->cdev[1]->handler = claw_irq_handler;
3309         cgdev->dev.type = &claw_devtype;
3310         CLAW_DBF_TEXT(2, setup, "prbext 0");
3311 
3312         return 0;
3313 }  /*  end of claw_probe       */
3314 
3315 /*--------------------------------------------------------------------*
3316 *    claw_init  and cleanup                                           *
3317 *---------------------------------------------------------------------*/
3318 
3319 static void __exit claw_cleanup(void)
3320 {
3321         ccwgroup_driver_unregister(&claw_group_driver);
3322         ccw_driver_unregister(&claw_ccw_driver);
3323         root_device_unregister(claw_root_dev);
3324         claw_unregister_debug_facility();
3325         pr_info("Driver unloaded\n");
3326 }
3327 
3328 /**
3329  * Initialize module.
3330  * This is called just after the module is loaded.
3331  *
3332  * @return 0 on success, !0 on error.
3333  */
3334 static int __init claw_init(void)
3335 {
3336         int ret = 0;
3337 
3338         pr_info("Loading %s\n", version);
3339         ret = claw_register_debug_facility();
3340         if (ret) {
3341                 pr_err("Registering with the S/390 debug feature"
3342                         " failed with error code %d\n", ret);
3343                 goto out_err;
3344         }
3345         CLAW_DBF_TEXT(2, setup, "init_mod");
3346         claw_root_dev = root_device_register("claw");
3347         ret = PTR_ERR_OR_ZERO(claw_root_dev);
3348         if (ret)
3349                 goto register_err;
3350         ret = ccw_driver_register(&claw_ccw_driver);
3351         if (ret)
3352                 goto ccw_err;
3353         claw_group_driver.driver.groups = claw_drv_attr_groups;
3354         ret = ccwgroup_driver_register(&claw_group_driver);
3355         if (ret)
3356                 goto ccwgroup_err;
3357         return 0;
3358 
3359 ccwgroup_err:
3360         ccw_driver_unregister(&claw_ccw_driver);
3361 ccw_err:
3362         root_device_unregister(claw_root_dev);
3363 register_err:
3364         CLAW_DBF_TEXT(2, setup, "init_bad");
3365         claw_unregister_debug_facility();
3366 out_err:
3367         pr_err("Initializing the claw device driver failed\n");
3368         return ret;
3369 }
3370 
3371 module_init(claw_init);
3372 module_exit(claw_cleanup);
3373 
3374 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3375 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3376                         "Copyright IBM Corp. 2000, 2008\n");
3377 MODULE_LICENSE("GPL");
3378 

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