a08b1682c8e852c216c0a6beafab2138f00a0d78
[linux-2.6.git] / drivers / s390 / net / claw.c
1 /*
2  *  drivers/s390/net/claw.c
3  *    ESCON CLAW network driver
4  *
5  *  Linux for zSeries version
6  *    Copyright (C) 2002,2005 IBM Corporation
7  *  Author(s) Original code written by:
8  *              Kazuo Iimura (iimura@jp.ibm.com)
9  *            Rewritten by
10  *              Andy Richter (richtera@us.ibm.com)
11  *              Marc Price (mwprice@us.ibm.com)
12  *
13  *    sysfs parms:
14  *   group x.x.rrrr,x.x.wwww
15  *   read_buffer nnnnnnn
16  *   write_buffer nnnnnn
17  *   host_name  aaaaaaaa
18  *   adapter_name aaaaaaaa
19  *   api_type    aaaaaaaa
20  *
21  *  eg.
22  *   group  0.0.0200 0.0.0201
23  *   read_buffer 25
24  *   write_buffer 20
25  *   host_name LINUX390
26  *   adapter_name RS6K
27  *   api_type     TCPIP
28  *
29  *  where
30  *
31  *   The device id is decided by the order entries
32  *   are added to the group the first is claw0 the second claw1
33  *   up to CLAW_MAX_DEV
34  *
35  *   rrrr     - the first of 2 consecutive device addresses used for the
36  *              CLAW protocol.
37  *              The specified address is always used as the input (Read)
38  *              channel and the next address is used as the output channel.
39  *
40  *   wwww     - the second of 2 consecutive device addresses used for
41  *              the CLAW protocol.
42  *              The specified address is always used as the output
43  *              channel and the previous address is used as the input channel.
44  *
45  *   read_buffer        -       specifies number of input buffers to allocate.
46  *   write_buffer       -       specifies number of output buffers to allocate.
47  *   host_name          -       host name
48  *   adaptor_name       -       adaptor name
49  *   api_type           -       API type TCPIP or API will be sent and expected
50  *                              as ws_name
51  *
52  *   Note the following requirements:
53  *   1)  host_name must match the configured adapter_name on the remote side
54  *   2)  adaptor_name must match the configured host name on the remote side
55  *
56  *  Change History
57  *    1.00  Initial release shipped
58  *    1.10  Changes for Buffer allocation
59  *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
60  *    1.25  Added Packing support
61  *    1.5
62  */
63 #include <asm/ccwdev.h>
64 #include <asm/ccwgroup.h>
65 #include <asm/debug.h>
66 #include <asm/idals.h>
67 #include <asm/io.h>
68 #include <linux/bitops.h>
69 #include <linux/ctype.h>
70 #include <linux/delay.h>
71 #include <linux/errno.h>
72 #include <linux/if_arp.h>
73 #include <linux/init.h>
74 #include <linux/interrupt.h>
75 #include <linux/ip.h>
76 #include <linux/kernel.h>
77 #include <linux/module.h>
78 #include <linux/netdevice.h>
79 #include <linux/etherdevice.h>
80 #include <linux/proc_fs.h>
81 #include <linux/sched.h>
82 #include <linux/signal.h>
83 #include <linux/skbuff.h>
84 #include <linux/slab.h>
85 #include <linux/string.h>
86 #include <linux/tcp.h>
87 #include <linux/timer.h>
88 #include <linux/types.h>
89
90 #include "cu3088.h"
91 #include "claw.h"
92
93 /*
94    CLAW uses the s390dbf file system  see claw_trace and claw_setup
95 */
96
97
98 static char debug_buffer[255];
99 /**
100  * Debug Facility Stuff
101  */
102 static debug_info_t *claw_dbf_setup;
103 static debug_info_t *claw_dbf_trace;
104
105 /**
106  *  CLAW Debug Facility functions
107  */
108 static void
109 claw_unregister_debug_facility(void)
110 {
111         if (claw_dbf_setup)
112                 debug_unregister(claw_dbf_setup);
113         if (claw_dbf_trace)
114                 debug_unregister(claw_dbf_trace);
115 }
116
117 static int
118 claw_register_debug_facility(void)
119 {
120         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
121         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
122         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
123                 claw_unregister_debug_facility();
124                 return -ENOMEM;
125         }
126         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
127         debug_set_level(claw_dbf_setup, 2);
128         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
129         debug_set_level(claw_dbf_trace, 2);
130         return 0;
131 }
132
133 static inline void
134 claw_set_busy(struct net_device *dev)
135 {
136  ((struct claw_privbk *) dev->priv)->tbusy=1;
137  eieio();
138 }
139
140 static inline void
141 claw_clear_busy(struct net_device *dev)
142 {
143         clear_bit(0, &(((struct claw_privbk *) dev->priv)->tbusy));
144         netif_wake_queue(dev);
145         eieio();
146 }
147
148 static inline int
149 claw_check_busy(struct net_device *dev)
150 {
151         eieio();
152         return ((struct claw_privbk *) dev->priv)->tbusy;
153 }
154
155 static inline void
156 claw_setbit_busy(int nr,struct net_device *dev)
157 {
158         netif_stop_queue(dev);
159         set_bit(nr, (void *)&(((struct claw_privbk *)dev->priv)->tbusy));
160 }
161
162 static inline void
163 claw_clearbit_busy(int nr,struct net_device *dev)
164 {
165         clear_bit(nr,(void *)&(((struct claw_privbk *)dev->priv)->tbusy));
166         netif_wake_queue(dev);
167 }
168
169 static inline int
170 claw_test_and_setbit_busy(int nr,struct net_device *dev)
171 {
172         netif_stop_queue(dev);
173         return test_and_set_bit(nr,
174                 (void *)&(((struct claw_privbk *) dev->priv)->tbusy));
175 }
176
177
178 /* Functions for the DEV methods */
179
180 static int claw_probe(struct ccwgroup_device *cgdev);
181 static void claw_remove_device(struct ccwgroup_device *cgdev);
182 static void claw_purge_skb_queue(struct sk_buff_head *q);
183 static int claw_new_device(struct ccwgroup_device *cgdev);
184 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
185 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
186 static int claw_change_mtu( struct net_device *dev, int new_mtu);
187 static int claw_open(struct net_device *dev);
188 static void claw_irq_handler(struct ccw_device *cdev,
189         unsigned long intparm, struct irb *irb);
190 static void claw_irq_tasklet ( unsigned long data );
191 static int claw_release(struct net_device *dev);
192 static void claw_write_retry ( struct chbk * p_ch );
193 static void claw_write_next ( struct chbk * p_ch );
194 static void claw_timer ( struct chbk * p_ch );
195
196 /* Functions */
197 static int add_claw_reads(struct net_device *dev,
198         struct ccwbk* p_first, struct ccwbk* p_last);
199 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
200 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
201 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
202 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
203 static int init_ccw_bk(struct net_device *dev);
204 static void probe_error( struct ccwgroup_device *cgdev);
205 static struct net_device_stats *claw_stats(struct net_device *dev);
206 static int pages_to_order_of_mag(int num_of_pages);
207 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
208 /* sysfs Functions */
209 static ssize_t claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf);
210 static ssize_t claw_hname_write(struct device *dev, struct device_attribute *attr,
211         const char *buf, size_t count);
212 static ssize_t claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf);
213 static ssize_t claw_adname_write(struct device *dev, struct device_attribute *attr,
214         const char *buf, size_t count);
215 static ssize_t claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf);
216 static ssize_t claw_apname_write(struct device *dev, struct device_attribute *attr,
217         const char *buf, size_t count);
218 static ssize_t claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf);
219 static ssize_t claw_wbuff_write(struct device *dev, struct device_attribute *attr,
220         const char *buf, size_t count);
221 static ssize_t claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf);
222 static ssize_t claw_rbuff_write(struct device *dev, struct device_attribute *attr,
223         const char *buf, size_t count);
224 static int claw_add_files(struct device *dev);
225 static void claw_remove_files(struct device *dev);
226
227 /*   Functions for System Validate  */
228 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
229 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
230        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
231 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
232 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
233 static int claw_snd_sys_validate_rsp(struct net_device *dev,
234         struct clawctl * p_ctl, __u32 return_code);
235 static int claw_strt_conn_req(struct net_device *dev );
236 static void claw_strt_read(struct net_device *dev, int lock);
237 static void claw_strt_out_IO(struct net_device *dev);
238 static void claw_free_wrt_buf(struct net_device *dev);
239
240 /* Functions for unpack reads   */
241 static void unpack_read(struct net_device *dev);
242
243 /* ccwgroup table  */
244
245 static struct ccwgroup_driver claw_group_driver = {
246         .owner       = THIS_MODULE,
247         .name        = "claw",
248         .max_slaves  = 2,
249         .driver_id   = 0xC3D3C1E6,
250         .probe       = claw_probe,
251         .remove      = claw_remove_device,
252         .set_online  = claw_new_device,
253         .set_offline = claw_shutdown_device,
254 };
255
256 /*
257 *       Key functions
258 */
259
260 /*----------------------------------------------------------------*
261  *   claw_probe                                                   *
262  *      this function is called for each CLAW device.             *
263  *----------------------------------------------------------------*/
264 static int
265 claw_probe(struct ccwgroup_device *cgdev)
266 {
267         int             rc;
268         struct claw_privbk *privptr=NULL;
269
270         CLAW_DBF_TEXT(2, setup, "probe");
271         if (!get_device(&cgdev->dev))
272                 return -ENODEV;
273         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
274         if (privptr == NULL) {
275                 probe_error(cgdev);
276                 put_device(&cgdev->dev);
277                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
278                 return -ENOMEM;
279         }
280         privptr->p_mtc_envelope= kzalloc( MAX_ENVELOPE_SIZE, GFP_KERNEL);
281         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
282         if ((privptr->p_mtc_envelope==NULL) || (privptr->p_env==NULL)) {
283                 probe_error(cgdev);
284                 put_device(&cgdev->dev);
285                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
286                 return -ENOMEM;
287         }
288         memcpy(privptr->p_env->adapter_name,WS_NAME_NOT_DEF,8);
289         memcpy(privptr->p_env->host_name,WS_NAME_NOT_DEF,8);
290         memcpy(privptr->p_env->api_type,WS_NAME_NOT_DEF,8);
291         privptr->p_env->packing = 0;
292         privptr->p_env->write_buffers = 5;
293         privptr->p_env->read_buffers = 5;
294         privptr->p_env->read_size = CLAW_FRAME_SIZE;
295         privptr->p_env->write_size = CLAW_FRAME_SIZE;
296         rc = claw_add_files(&cgdev->dev);
297         if (rc) {
298                 probe_error(cgdev);
299                 put_device(&cgdev->dev);
300                 printk(KERN_WARNING "add_files failed %s %s Exit Line %d \n",
301                         cgdev->cdev[0]->dev.bus_id,__func__,__LINE__);
302                 CLAW_DBF_TEXT_(2, setup, "probex%d", rc);
303                 return rc;
304         }
305         privptr->p_env->p_priv = privptr;
306         cgdev->cdev[0]->handler = claw_irq_handler;
307         cgdev->cdev[1]->handler = claw_irq_handler;
308         cgdev->dev.driver_data = privptr;
309         CLAW_DBF_TEXT(2, setup, "prbext 0");
310
311         return 0;
312 }  /*  end of claw_probe       */
313
314 /*-------------------------------------------------------------------*
315  *   claw_tx                                                         *
316  *-------------------------------------------------------------------*/
317
318 static int
319 claw_tx(struct sk_buff *skb, struct net_device *dev)
320 {
321         int             rc;
322         struct claw_privbk *privptr=dev->priv;
323         unsigned long saveflags;
324         struct chbk *p_ch;
325
326         CLAW_DBF_TEXT(4, trace, "claw_tx");
327         p_ch=&privptr->channel[WRITE];
328         if (skb == NULL) {
329                 privptr->stats.tx_dropped++;
330                 privptr->stats.tx_errors++;
331                 CLAW_DBF_TEXT_(2, trace, "clawtx%d", -EIO);
332                 return -EIO;
333         }
334         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
335         rc=claw_hw_tx( skb, dev, 1 );
336         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
337         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
338         return rc;
339 }   /*  end of claw_tx */
340
341 /*------------------------------------------------------------------*
342  *  pack the collect queue into an skb and return it                *
343  *   If not packing just return the top skb from the queue          *
344  *------------------------------------------------------------------*/
345
346 static struct sk_buff *
347 claw_pack_skb(struct claw_privbk *privptr)
348 {
349         struct sk_buff *new_skb,*held_skb;
350         struct chbk *p_ch = &privptr->channel[WRITE];
351         struct claw_env  *p_env = privptr->p_env;
352         int     pkt_cnt,pk_ind,so_far;
353
354         new_skb = NULL;         /* assume no dice */
355         pkt_cnt = 0;
356         CLAW_DBF_TEXT(4, trace, "PackSKBe");
357         if (!skb_queue_empty(&p_ch->collect_queue)) {
358         /* some data */
359                 held_skb = skb_dequeue(&p_ch->collect_queue);
360                 if (held_skb)
361                         dev_kfree_skb_any(held_skb);
362                 else
363                         return NULL;
364                 if (p_env->packing != DO_PACKED)
365                         return held_skb;
366                 /* get a new SKB we will pack at least one */
367                 new_skb = dev_alloc_skb(p_env->write_size);
368                 if (new_skb == NULL) {
369                         atomic_inc(&held_skb->users);
370                         skb_queue_head(&p_ch->collect_queue,held_skb);
371                         return NULL;
372                 }
373                 /* we have packed packet and a place to put it  */
374                 pk_ind = 1;
375                 so_far = 0;
376                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
377                 while ((pk_ind) && (held_skb != NULL)) {
378                         if (held_skb->len+so_far <= p_env->write_size-8) {
379                                 memcpy(skb_put(new_skb,held_skb->len),
380                                         held_skb->data,held_skb->len);
381                                 privptr->stats.tx_packets++;
382                                 so_far += held_skb->len;
383                                 pkt_cnt++;
384                                 dev_kfree_skb_any(held_skb);
385                                 held_skb = skb_dequeue(&p_ch->collect_queue);
386                                 if (held_skb)
387                                         atomic_dec(&held_skb->users);
388                         } else {
389                                 pk_ind = 0;
390                                 atomic_inc(&held_skb->users);
391                                 skb_queue_head(&p_ch->collect_queue,held_skb);
392                         }
393                 }
394         }
395         CLAW_DBF_TEXT(4, trace, "PackSKBx");
396         return new_skb;
397 }
398
399 /*-------------------------------------------------------------------*
400  *   claw_change_mtu                                                 *
401  *                                                                   *
402  *-------------------------------------------------------------------*/
403
404 static int
405 claw_change_mtu(struct net_device *dev, int new_mtu)
406 {
407         struct claw_privbk  *privptr=dev->priv;
408         int buff_size;
409         CLAW_DBF_TEXT(4, trace, "setmtu");
410         buff_size = privptr->p_env->write_size;
411         if ((new_mtu < 60) || (new_mtu > buff_size)) {
412                 return -EINVAL;
413         }
414         dev->mtu = new_mtu;
415         return 0;
416 }  /*   end of claw_change_mtu */
417
418
419 /*-------------------------------------------------------------------*
420  *   claw_open                                                       *
421  *                                                                   *
422  *-------------------------------------------------------------------*/
423 static int
424 claw_open(struct net_device *dev)
425 {
426
427         int     rc;
428         int     i;
429         unsigned long       saveflags=0;
430         unsigned long       parm;
431         struct claw_privbk  *privptr;
432         DECLARE_WAITQUEUE(wait, current);
433         struct timer_list  timer;
434         struct ccwbk *p_buf;
435
436         CLAW_DBF_TEXT(4, trace, "open");
437         privptr = (struct claw_privbk *)dev->priv;
438         /*   allocate and initialize CCW blocks */
439         if (privptr->buffs_alloc == 0) {
440                 rc=init_ccw_bk(dev);
441                 if (rc) {
442                         CLAW_DBF_TEXT(2, trace, "openmem");
443                         return -ENOMEM;
444                 }
445         }
446         privptr->system_validate_comp=0;
447         privptr->release_pend=0;
448         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
449                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
450                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
451                 privptr->p_env->packing=PACKING_ASK;
452         } else {
453                 privptr->p_env->packing=0;
454                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
455                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
456         }
457         claw_set_busy(dev);
458         tasklet_init(&privptr->channel[READ].tasklet, claw_irq_tasklet,
459                 (unsigned long) &privptr->channel[READ]);
460         for ( i = 0; i < 2;  i++) {
461                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
462                 init_waitqueue_head(&privptr->channel[i].wait);
463                 /* skb_queue_head_init(&p_ch->io_queue); */
464                 if (i == WRITE)
465                         skb_queue_head_init(
466                                 &privptr->channel[WRITE].collect_queue);
467                 privptr->channel[i].flag_a = 0;
468                 privptr->channel[i].IO_active = 0;
469                 privptr->channel[i].flag  &= ~CLAW_TIMER;
470                 init_timer(&timer);
471                 timer.function = (void *)claw_timer;
472                 timer.data = (unsigned long)(&privptr->channel[i]);
473                 timer.expires = jiffies + 15*HZ;
474                 add_timer(&timer);
475                 spin_lock_irqsave(get_ccwdev_lock(
476                         privptr->channel[i].cdev), saveflags);
477                 parm = (unsigned long) &privptr->channel[i];
478                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
479                 rc = 0;
480                 add_wait_queue(&privptr->channel[i].wait, &wait);
481                 rc = ccw_device_halt(
482                         (struct ccw_device *)privptr->channel[i].cdev,parm);
483                 set_current_state(TASK_INTERRUPTIBLE);
484                 spin_unlock_irqrestore(
485                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
486                 schedule();
487                 set_current_state(TASK_RUNNING);
488                 remove_wait_queue(&privptr->channel[i].wait, &wait);
489                 if(rc != 0)
490                         ccw_check_return_code(privptr->channel[i].cdev, rc);
491                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
492                         del_timer(&timer);
493         }
494         if ((((privptr->channel[READ].last_dstat |
495                 privptr->channel[WRITE].last_dstat) &
496            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
497            (((privptr->channel[READ].flag |
498                 privptr->channel[WRITE].flag) & CLAW_TIMER) != 0x00)) {
499                 printk(KERN_INFO "%s: remote side is not ready\n", dev->name);
500                 CLAW_DBF_TEXT(2, trace, "notrdy");
501
502                 for ( i = 0; i < 2;  i++) {
503                         spin_lock_irqsave(
504                                 get_ccwdev_lock(privptr->channel[i].cdev),
505                                 saveflags);
506                         parm = (unsigned long) &privptr->channel[i];
507                         privptr->channel[i].claw_state = CLAW_STOP;
508                         rc = ccw_device_halt(
509                                 (struct ccw_device *)&privptr->channel[i].cdev,
510                                 parm);
511                         spin_unlock_irqrestore(
512                                 get_ccwdev_lock(privptr->channel[i].cdev),
513                                 saveflags);
514                         if (rc != 0) {
515                                 ccw_check_return_code(
516                                         privptr->channel[i].cdev, rc);
517                         }
518                 }
519                 free_pages((unsigned long)privptr->p_buff_ccw,
520                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
521                 if (privptr->p_env->read_size < PAGE_SIZE) {
522                         free_pages((unsigned long)privptr->p_buff_read,
523                                (int)pages_to_order_of_mag(
524                                         privptr->p_buff_read_num));
525                 }
526                 else {
527                         p_buf=privptr->p_read_active_first;
528                         while (p_buf!=NULL) {
529                                 free_pages((unsigned long)p_buf->p_buffer,
530                                       (int)pages_to_order_of_mag(
531                                         privptr->p_buff_pages_perread ));
532                                 p_buf=p_buf->next;
533                         }
534                 }
535                 if (privptr->p_env->write_size < PAGE_SIZE ) {
536                         free_pages((unsigned long)privptr->p_buff_write,
537                              (int)pages_to_order_of_mag(
538                                 privptr->p_buff_write_num));
539                 }
540                 else {
541                         p_buf=privptr->p_write_active_first;
542                         while (p_buf!=NULL) {
543                                 free_pages((unsigned long)p_buf->p_buffer,
544                                      (int)pages_to_order_of_mag(
545                                         privptr->p_buff_pages_perwrite ));
546                                 p_buf=p_buf->next;
547                         }
548                 }
549                 privptr->buffs_alloc = 0;
550                 privptr->channel[READ].flag= 0x00;
551                 privptr->channel[WRITE].flag = 0x00;
552                 privptr->p_buff_ccw=NULL;
553                 privptr->p_buff_read=NULL;
554                 privptr->p_buff_write=NULL;
555                 claw_clear_busy(dev);
556                 CLAW_DBF_TEXT(2, trace, "open EIO");
557                 return -EIO;
558         }
559
560         /*   Send SystemValidate command */
561
562         claw_clear_busy(dev);
563         CLAW_DBF_TEXT(4, trace, "openok");
564         return 0;
565 }    /*     end of claw_open    */
566
567 /*-------------------------------------------------------------------*
568 *                                                                    *
569 *       claw_irq_handler                                             *
570 *                                                                    *
571 *--------------------------------------------------------------------*/
572 static void
573 claw_irq_handler(struct ccw_device *cdev,
574         unsigned long intparm, struct irb *irb)
575 {
576         struct chbk *p_ch = NULL;
577         struct claw_privbk *privptr = NULL;
578         struct net_device *dev = NULL;
579         struct claw_env  *p_env;
580         struct chbk *p_ch_r=NULL;
581
582         CLAW_DBF_TEXT(4, trace, "clawirq");
583         /* Bypass all 'unsolicited interrupts' */
584         if (!cdev->dev.driver_data) {
585                 printk(KERN_WARNING "claw: unsolicited interrupt for device:"
586                         "%s received c-%02x d-%02x\n",
587                        cdev->dev.bus_id, irb->scsw.cmd.cstat,
588                        irb->scsw.cmd.dstat);
589                 CLAW_DBF_TEXT(2, trace, "badirq");
590                 return;
591         }
592         privptr = (struct claw_privbk *)cdev->dev.driver_data;
593
594         /* Try to extract channel from driver data. */
595         if (privptr->channel[READ].cdev == cdev)
596                 p_ch = &privptr->channel[READ];
597         else if (privptr->channel[WRITE].cdev == cdev)
598                 p_ch = &privptr->channel[WRITE];
599         else {
600                 printk(KERN_WARNING "claw: Can't determine channel for "
601                         "interrupt, device %s\n", cdev->dev.bus_id);
602                 CLAW_DBF_TEXT(2, trace, "badchan");
603                 return;
604         }
605         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
606
607         dev = (struct net_device *) (p_ch->ndev);
608         p_env=privptr->p_env;
609
610         /* Copy interruption response block. */
611         memcpy(p_ch->irb, irb, sizeof(struct irb));
612
613         /* Check for good subchannel return code, otherwise info message */
614         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
615                 printk(KERN_INFO "%s: subchannel check for device: %04x -"
616                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
617                         dev->name, p_ch->devno,
618                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
619                         irb->scsw.cmd.cpa);
620                 CLAW_DBF_TEXT(2, trace, "chanchk");
621                 /* return; */
622         }
623
624         /* Check the reason-code of a unit check */
625         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
626                 ccw_check_unit_check(p_ch, irb->ecw[0]);
627
628         /* State machine to bring the connection up, down and to restart */
629         p_ch->last_dstat = irb->scsw.cmd.dstat;
630
631         switch (p_ch->claw_state) {
632         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
633                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
634                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
635                 (p_ch->irb->scsw.cmd.stctl ==
636                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
637                         return;
638                 wake_up(&p_ch->wait);   /* wake up claw_release */
639                 CLAW_DBF_TEXT(4, trace, "stop");
640                 return;
641         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
642                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
643                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
644                 (p_ch->irb->scsw.cmd.stctl ==
645                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
646                         CLAW_DBF_TEXT(4, trace, "haltio");
647                         return;
648                 }
649                 if (p_ch->flag == CLAW_READ) {
650                         p_ch->claw_state = CLAW_START_READ;
651                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
652                 } else if (p_ch->flag == CLAW_WRITE) {
653                         p_ch->claw_state = CLAW_START_WRITE;
654                         /*      send SYSTEM_VALIDATE                    */
655                         claw_strt_read(dev, LOCK_NO);
656                         claw_send_control(dev,
657                                 SYSTEM_VALIDATE_REQUEST,
658                                 0, 0, 0,
659                                 p_env->host_name,
660                                 p_env->adapter_name);
661                 } else {
662                         printk(KERN_WARNING "claw: unsolicited "
663                                 "interrupt for device:"
664                                 "%s received c-%02x d-%02x\n",
665                                 cdev->dev.bus_id,
666                                 irb->scsw.cmd.cstat,
667                                 irb->scsw.cmd.dstat);
668                         return;
669                         }
670                 CLAW_DBF_TEXT(4, trace, "haltio");
671                 return;
672         case CLAW_START_READ:
673                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
674                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
675                         clear_bit(0, (void *)&p_ch->IO_active);
676                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
677                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
678                             (p_ch->irb->ecw[0])        == 0) {
679                                 privptr->stats.rx_errors++;
680                                 printk(KERN_INFO "%s: Restart is "
681                                         "required after remote "
682                                         "side recovers \n",
683                                         dev->name);
684                         }
685                         CLAW_DBF_TEXT(4, trace, "notrdy");
686                         return;
687                 }
688                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
689                         (p_ch->irb->scsw.cmd.dstat == 0)) {
690                         if (test_and_set_bit(CLAW_BH_ACTIVE,
691                                 (void *)&p_ch->flag_a) == 0)
692                                 tasklet_schedule(&p_ch->tasklet);
693                         else
694                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
695                         CLAW_DBF_TEXT(4, trace, "PCI_read");
696                         return;
697                 }
698                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
699                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
700                  (p_ch->irb->scsw.cmd.stctl ==
701                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
702                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
703                         return;
704                 }
705                 clear_bit(0, (void *)&p_ch->IO_active);
706                 claw_clearbit_busy(TB_RETRY, dev);
707                 if (test_and_set_bit(CLAW_BH_ACTIVE,
708                         (void *)&p_ch->flag_a) == 0)
709                         tasklet_schedule(&p_ch->tasklet);
710                 else
711                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
712                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
713                 return;
714         case CLAW_START_WRITE:
715                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
716                         printk(KERN_INFO "%s: Unit Check Occured in "
717                                 "write channel\n", dev->name);
718                         clear_bit(0, (void *)&p_ch->IO_active);
719                         if (p_ch->irb->ecw[0] & 0x80) {
720                                 printk(KERN_INFO "%s: Resetting Event "
721                                         "occurred:\n", dev->name);
722                                 init_timer(&p_ch->timer);
723                                 p_ch->timer.function =
724                                         (void *)claw_write_retry;
725                                 p_ch->timer.data = (unsigned long)p_ch;
726                                 p_ch->timer.expires = jiffies + 10*HZ;
727                                 add_timer(&p_ch->timer);
728                                 printk(KERN_INFO "%s: write connection "
729                                         "restarting\n", dev->name);
730                         }
731                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
732                         return;
733                 }
734                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
735                         clear_bit(0, (void *)&p_ch->IO_active);
736                         printk(KERN_INFO "%s: Unit Exception "
737                                "Occured in write channel\n",
738                                dev->name);
739                 }
740                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
741                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
742                 (p_ch->irb->scsw.cmd.stctl ==
743                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
744                         CLAW_DBF_TEXT(4, trace, "writeUE");
745                         return;
746                 }
747                 clear_bit(0, (void *)&p_ch->IO_active);
748                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
749                         claw_write_next(p_ch);
750                         claw_clearbit_busy(TB_TX, dev);
751                         claw_clear_busy(dev);
752                 }
753                 p_ch_r = (struct chbk *)&privptr->channel[READ];
754                 if (test_and_set_bit(CLAW_BH_ACTIVE,
755                         (void *)&p_ch_r->flag_a) == 0)
756                         tasklet_schedule(&p_ch_r->tasklet);
757                 CLAW_DBF_TEXT(4, trace, "StWtExit");
758                 return;
759         default:
760                 printk(KERN_WARNING "%s: wrong selection code - irq "
761                         "state=%d\n", dev->name, p_ch->claw_state);
762                 CLAW_DBF_TEXT(2, trace, "badIRQ");
763                 return;
764         }
765
766 }       /*   end of claw_irq_handler    */
767
768
769 /*-------------------------------------------------------------------*
770 *       claw_irq_tasklet                                             *
771 *                                                                    *
772 *--------------------------------------------------------------------*/
773 static void
774 claw_irq_tasklet ( unsigned long data )
775 {
776         struct chbk * p_ch;
777         struct net_device  *dev;
778         struct claw_privbk *       privptr;
779
780         p_ch = (struct chbk *) data;
781         dev = (struct net_device *)p_ch->ndev;
782         CLAW_DBF_TEXT(4, trace, "IRQtask");
783         privptr = (struct claw_privbk *) dev->priv;
784         unpack_read(dev);
785         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
786         CLAW_DBF_TEXT(4, trace, "TskletXt");
787         return;
788 }       /*    end of claw_irq_bh    */
789
790 /*-------------------------------------------------------------------*
791 *       claw_release                                                 *
792 *                                                                    *
793 *--------------------------------------------------------------------*/
794 static int
795 claw_release(struct net_device *dev)
796 {
797         int                rc;
798         int                i;
799         unsigned long      saveflags;
800         unsigned long      parm;
801         struct claw_privbk *privptr;
802         DECLARE_WAITQUEUE(wait, current);
803         struct ccwbk*             p_this_ccw;
804         struct ccwbk*             p_buf;
805
806         if (!dev)
807                 return 0;
808         privptr = (struct claw_privbk *) dev->priv;
809         if (!privptr)
810                 return 0;
811         CLAW_DBF_TEXT(4, trace, "release");
812         privptr->release_pend=1;
813         claw_setbit_busy(TB_STOP,dev);
814         for ( i = 1; i >=0 ;  i--) {
815                 spin_lock_irqsave(
816                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
817              /*   del_timer(&privptr->channel[READ].timer);  */
818                 privptr->channel[i].claw_state = CLAW_STOP;
819                 privptr->channel[i].IO_active = 0;
820                 parm = (unsigned long) &privptr->channel[i];
821                 if (i == WRITE)
822                         claw_purge_skb_queue(
823                                 &privptr->channel[WRITE].collect_queue);
824                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
825                 if (privptr->system_validate_comp==0x00)  /* never opened? */
826                    init_waitqueue_head(&privptr->channel[i].wait);
827                 add_wait_queue(&privptr->channel[i].wait, &wait);
828                 set_current_state(TASK_INTERRUPTIBLE);
829                 spin_unlock_irqrestore(
830                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
831                 schedule();
832                 set_current_state(TASK_RUNNING);
833                 remove_wait_queue(&privptr->channel[i].wait, &wait);
834                 if (rc != 0) {
835                         ccw_check_return_code(privptr->channel[i].cdev, rc);
836                 }
837         }
838         if (privptr->pk_skb != NULL) {
839                 dev_kfree_skb_any(privptr->pk_skb);
840                 privptr->pk_skb = NULL;
841         }
842         if(privptr->buffs_alloc != 1) {
843                 CLAW_DBF_TEXT(4, trace, "none2fre");
844                 return 0;
845         }
846         CLAW_DBF_TEXT(4, trace, "freebufs");
847         if (privptr->p_buff_ccw != NULL) {
848                 free_pages((unsigned long)privptr->p_buff_ccw,
849                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
850         }
851         CLAW_DBF_TEXT(4, trace, "freeread");
852         if (privptr->p_env->read_size < PAGE_SIZE) {
853             if (privptr->p_buff_read != NULL) {
854                 free_pages((unsigned long)privptr->p_buff_read,
855                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
856                 }
857         }
858         else {
859                 p_buf=privptr->p_read_active_first;
860                 while (p_buf!=NULL) {
861                         free_pages((unsigned long)p_buf->p_buffer,
862                              (int)pages_to_order_of_mag(
863                                 privptr->p_buff_pages_perread ));
864                         p_buf=p_buf->next;
865                 }
866         }
867          CLAW_DBF_TEXT(4, trace, "freewrit");
868         if (privptr->p_env->write_size < PAGE_SIZE ) {
869                 free_pages((unsigned long)privptr->p_buff_write,
870                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
871         }
872         else {
873                 p_buf=privptr->p_write_active_first;
874                 while (p_buf!=NULL) {
875                         free_pages((unsigned long)p_buf->p_buffer,
876                               (int)pages_to_order_of_mag(
877                               privptr->p_buff_pages_perwrite ));
878                         p_buf=p_buf->next;
879                 }
880         }
881          CLAW_DBF_TEXT(4, trace, "clearptr");
882         privptr->buffs_alloc = 0;
883         privptr->p_buff_ccw=NULL;
884         privptr->p_buff_read=NULL;
885         privptr->p_buff_write=NULL;
886         privptr->system_validate_comp=0;
887         privptr->release_pend=0;
888         /*      Remove any writes that were pending and reset all reads   */
889         p_this_ccw=privptr->p_read_active_first;
890         while (p_this_ccw!=NULL) {
891                 p_this_ccw->header.length=0xffff;
892                 p_this_ccw->header.opcode=0xff;
893                 p_this_ccw->header.flag=0x00;
894                 p_this_ccw=p_this_ccw->next;
895         }
896
897         while (privptr->p_write_active_first!=NULL) {
898                 p_this_ccw=privptr->p_write_active_first;
899                 p_this_ccw->header.flag=CLAW_PENDING;
900                 privptr->p_write_active_first=p_this_ccw->next;
901                 p_this_ccw->next=privptr->p_write_free_chain;
902                 privptr->p_write_free_chain=p_this_ccw;
903                 ++privptr->write_free_count;
904         }
905         privptr->p_write_active_last=NULL;
906         privptr->mtc_logical_link = -1;
907         privptr->mtc_skipping = 1;
908         privptr->mtc_offset=0;
909
910         if (((privptr->channel[READ].last_dstat |
911                 privptr->channel[WRITE].last_dstat) &
912                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
913                 printk(KERN_WARNING "%s: channel problems during close - "
914                         "read: %02x -  write: %02x\n",
915                 dev->name,
916                 privptr->channel[READ].last_dstat,
917                 privptr->channel[WRITE].last_dstat);
918                  CLAW_DBF_TEXT(2, trace, "badclose");
919         }
920         CLAW_DBF_TEXT(4, trace, "rlsexit");
921         return 0;
922 }      /* end of claw_release     */
923
924 /*-------------------------------------------------------------------*
925 *       claw_write_retry                                             *
926 *                                                                    *
927 *--------------------------------------------------------------------*/
928
929 static void
930 claw_write_retry ( struct chbk *p_ch )
931 {
932
933         struct net_device  *dev=p_ch->ndev;
934
935         CLAW_DBF_TEXT(4, trace, "w_retry");
936         if (p_ch->claw_state == CLAW_STOP) {
937                 return;
938         }
939         claw_strt_out_IO( dev );
940         CLAW_DBF_TEXT(4, trace, "rtry_xit");
941         return;
942 }      /* end of claw_write_retry      */
943
944
945 /*-------------------------------------------------------------------*
946 *       claw_write_next                                              *
947 *                                                                    *
948 *--------------------------------------------------------------------*/
949
950 static void
951 claw_write_next ( struct chbk * p_ch )
952 {
953
954         struct net_device  *dev;
955         struct claw_privbk *privptr=NULL;
956         struct sk_buff *pk_skb;
957         int     rc;
958
959         CLAW_DBF_TEXT(4, trace, "claw_wrt");
960         if (p_ch->claw_state == CLAW_STOP)
961                 return;
962         dev = (struct net_device *) p_ch->ndev;
963         privptr = (struct claw_privbk *) dev->priv;
964         claw_free_wrt_buf( dev );
965         if ((privptr->write_free_count > 0) &&
966             !skb_queue_empty(&p_ch->collect_queue)) {
967                 pk_skb = claw_pack_skb(privptr);
968                 while (pk_skb != NULL) {
969                         rc = claw_hw_tx( pk_skb, dev,1);
970                         if (privptr->write_free_count > 0) {
971                                 pk_skb = claw_pack_skb(privptr);
972                         } else
973                                 pk_skb = NULL;
974                 }
975         }
976         if (privptr->p_write_active_first!=NULL) {
977                 claw_strt_out_IO(dev);
978         }
979         return;
980 }      /* end of claw_write_next      */
981
982 /*-------------------------------------------------------------------*
983 *                                                                    *
984 *       claw_timer                                                   *
985 *--------------------------------------------------------------------*/
986
987 static void
988 claw_timer ( struct chbk * p_ch )
989 {
990         CLAW_DBF_TEXT(4, trace, "timer");
991         p_ch->flag |= CLAW_TIMER;
992         wake_up(&p_ch->wait);
993         return;
994 }      /* end of claw_timer  */
995
996 /*
997 *
998 *       functions
999 */
1000
1001
1002 /*-------------------------------------------------------------------*
1003 *                                                                    *
1004 *     pages_to_order_of_mag                                          *
1005 *                                                                    *
1006 *    takes a number of pages from 1 to 512 and returns the           *
1007 *    log(num_pages)/log(2) get_free_pages() needs a base 2 order     *
1008 *    of magnitude get_free_pages() has an upper order of 9           *
1009 *--------------------------------------------------------------------*/
1010
1011 static int
1012 pages_to_order_of_mag(int num_of_pages)
1013 {
1014         int     order_of_mag=1;         /* assume 2 pages */
1015         int     nump=2;
1016
1017         CLAW_DBF_TEXT_(5, trace, "pages%d", num_of_pages);
1018         if (num_of_pages == 1)   {return 0; }  /* magnitude of 0 = 1 page */
1019         /* 512 pages = 2Meg on 4k page systems */
1020         if (num_of_pages >= 512) {return 9; }
1021         /* we have two or more pages order is at least 1 */
1022         for (nump=2 ;nump <= 512;nump*=2) {
1023           if (num_of_pages <= nump)
1024                   break;
1025           order_of_mag +=1;
1026         }
1027         if (order_of_mag > 9) { order_of_mag = 9; }  /* I know it's paranoid */
1028         CLAW_DBF_TEXT_(5, trace, "mag%d", order_of_mag);
1029         return order_of_mag;
1030 }
1031
1032 /*-------------------------------------------------------------------*
1033 *                                                                    *
1034 *     add_claw_reads                                                 *
1035 *                                                                    *
1036 *--------------------------------------------------------------------*/
1037 static int
1038 add_claw_reads(struct net_device *dev, struct ccwbk* p_first,
1039         struct ccwbk* p_last)
1040 {
1041         struct claw_privbk *privptr;
1042         struct ccw1  temp_ccw;
1043         struct endccw * p_end;
1044         CLAW_DBF_TEXT(4, trace, "addreads");
1045         privptr = dev->priv;
1046         p_end = privptr->p_end_ccw;
1047
1048         /* first CCW and last CCW contains a new set of read channel programs
1049         *       to apend the running channel programs
1050         */
1051         if ( p_first==NULL) {
1052                 CLAW_DBF_TEXT(4, trace, "addexit");
1053                 return 0;
1054         }
1055
1056         /* set up ending CCW sequence for this segment */
1057         if (p_end->read1) {
1058                 p_end->read1=0x00;    /*  second ending CCW is now active */
1059                 /*      reset ending CCWs and setup TIC CCWs              */
1060                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1061                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1062                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1063                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1064                 p_end->read2_nop2.cda=0;
1065                 p_end->read2_nop2.count=1;
1066         }
1067         else {
1068                 p_end->read1=0x01;  /* first ending CCW is now active */
1069                 /*      reset ending CCWs and setup TIC CCWs          */
1070                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1071                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1072                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1073                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1074                 p_end->read1_nop2.cda=0;
1075                 p_end->read1_nop2.count=1;
1076         }
1077
1078         if ( privptr-> p_read_active_first ==NULL ) {
1079                 privptr-> p_read_active_first= p_first;  /*    set new first */
1080                 privptr-> p_read_active_last = p_last;   /*    set new last  */
1081         }
1082         else {
1083
1084                 /* set up TIC ccw  */
1085                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1086                 temp_ccw.count=0;
1087                 temp_ccw.flags=0;
1088                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1089
1090
1091                 if (p_end->read1) {
1092
1093                /* first set of CCW's is chained to the new read              */
1094                /* chain, so the second set is chained to the active chain.   */
1095                /* Therefore modify the second set to point to the new        */
1096                /* read chain set up TIC CCWs                                 */
1097                /* make sure we update the CCW so channel doesn't fetch it    */
1098                /* when it's only half done                                   */
1099                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1100                                 sizeof(struct ccw1));
1101                         privptr->p_read_active_last->r_TIC_1.cda=
1102                                 (__u32)__pa(&p_first->read);
1103                         privptr->p_read_active_last->r_TIC_2.cda=
1104                                 (__u32)__pa(&p_first->read);
1105                 }
1106                 else {
1107                         /* make sure we update the CCW so channel doesn't   */
1108                         /* fetch it when it is only half done               */
1109                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1110                                 sizeof(struct ccw1));
1111                         privptr->p_read_active_last->r_TIC_1.cda=
1112                                 (__u32)__pa(&p_first->read);
1113                         privptr->p_read_active_last->r_TIC_2.cda=
1114                                 (__u32)__pa(&p_first->read);
1115                 }
1116                 /*      chain in new set of blocks                              */
1117                 privptr->p_read_active_last->next = p_first;
1118                 privptr->p_read_active_last=p_last;
1119         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1120         CLAW_DBF_TEXT(4, trace, "addexit");
1121         return 0;
1122 }    /*     end of add_claw_reads   */
1123
1124 /*-------------------------------------------------------------------*
1125  *   ccw_check_return_code                                           *
1126  *                                                                   *
1127  *-------------------------------------------------------------------*/
1128
1129 static void
1130 ccw_check_return_code(struct ccw_device *cdev, int return_code)
1131 {
1132         CLAW_DBF_TEXT(4, trace, "ccwret");
1133         if (return_code != 0) {
1134                 switch (return_code) {
1135                 case -EBUSY: /* BUSY is a transient state no action needed */
1136                         break;
1137                 case -ENODEV:
1138                         printk(KERN_EMERG "%s: Missing device called "
1139                                 "for IO ENODEV\n", cdev->dev.bus_id);
1140                         break;
1141                 case -EIO:
1142                         printk(KERN_EMERG "%s: Status pending... EIO \n",
1143                                 cdev->dev.bus_id);
1144                         break;
1145                 case -EINVAL:
1146                         printk(KERN_EMERG "%s: Invalid Dev State EINVAL \n",
1147                                 cdev->dev.bus_id);
1148                         break;
1149                 default:
1150                         printk(KERN_EMERG "%s: Unknown error in "
1151                                  "Do_IO %d\n",cdev->dev.bus_id, return_code);
1152                 }
1153         }
1154         CLAW_DBF_TEXT(4, trace, "ccwret");
1155 }    /*    end of ccw_check_return_code   */
1156
1157 /*-------------------------------------------------------------------*
1158 *       ccw_check_unit_check                                         *
1159 *--------------------------------------------------------------------*/
1160
1161 static void
1162 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1163 {
1164         struct net_device *ndev = p_ch->ndev;
1165
1166         CLAW_DBF_TEXT(4, trace, "unitchek");
1167         printk(KERN_INFO "%s: Unit Check with sense byte:0x%04x\n",
1168                ndev->name, sense);
1169
1170         if (sense & 0x40) {
1171                 if (sense & 0x01) {
1172                         printk(KERN_WARNING "%s: Interface disconnect or "
1173                                 "Selective reset "
1174                                 "occurred (remote side)\n", ndev->name);
1175                 }
1176                 else {
1177                         printk(KERN_WARNING "%s: System reset occured"
1178                                 " (remote side)\n", ndev->name);
1179                 }
1180         }
1181         else if (sense & 0x20) {
1182                 if (sense & 0x04) {
1183                         printk(KERN_WARNING "%s: Data-streaming "
1184                                 "timeout)\n", ndev->name);
1185                 }
1186                 else  {
1187                         printk(KERN_WARNING "%s: Data-transfer parity"
1188                                 " error\n", ndev->name);
1189                 }
1190         }
1191         else if (sense & 0x10) {
1192                 if (sense & 0x20) {
1193                         printk(KERN_WARNING "%s: Hardware malfunction "
1194                                 "(remote side)\n", ndev->name);
1195                 }
1196                 else {
1197                         printk(KERN_WARNING "%s: read-data parity error "
1198                                 "(remote side)\n", ndev->name);
1199                 }
1200         }
1201
1202 }   /*    end of ccw_check_unit_check    */
1203
1204 /*-------------------------------------------------------------------*
1205 *               find_link                                            *
1206 *--------------------------------------------------------------------*/
1207 static int
1208 find_link(struct net_device *dev, char *host_name, char *ws_name )
1209 {
1210         struct claw_privbk *privptr;
1211         struct claw_env *p_env;
1212         int    rc=0;
1213
1214         CLAW_DBF_TEXT(2, setup, "findlink");
1215         privptr=dev->priv;
1216         p_env=privptr->p_env;
1217         switch (p_env->packing)
1218         {
1219                 case  PACKING_ASK:
1220                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1221                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1222                              rc = EINVAL;
1223                         break;
1224                 case  DO_PACKED:
1225                 case  PACK_SEND:
1226                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1227                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1228                                 rc = EINVAL;
1229                         break;
1230                 default:
1231                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1232                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1233                                 rc = EINVAL;
1234                         break;
1235         }
1236
1237         return 0;
1238 }    /*    end of find_link    */
1239
1240 /*-------------------------------------------------------------------*
1241  *   claw_hw_tx                                                      *
1242  *                                                                   *
1243  *                                                                   *
1244  *-------------------------------------------------------------------*/
1245
1246 static int
1247 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1248 {
1249         int                             rc=0;
1250         struct claw_privbk              *privptr;
1251         struct ccwbk           *p_this_ccw;
1252         struct ccwbk           *p_first_ccw;
1253         struct ccwbk           *p_last_ccw;
1254         __u32                           numBuffers;
1255         signed long                     len_of_data;
1256         unsigned long                   bytesInThisBuffer;
1257         unsigned char                   *pDataAddress;
1258         struct endccw                   *pEnd;
1259         struct ccw1                     tempCCW;
1260         struct chbk                     *p_ch;
1261         struct claw_env                 *p_env;
1262         int                             lock;
1263         struct clawph                   *pk_head;
1264         struct chbk                     *ch;
1265
1266         CLAW_DBF_TEXT(4, trace, "hw_tx");
1267         privptr = (struct claw_privbk *) (dev->priv);
1268         p_ch=(struct chbk *)&privptr->channel[WRITE];
1269         p_env =privptr->p_env;
1270         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1271         /*  scan the write queue to free any completed write packets   */
1272         p_first_ccw=NULL;
1273         p_last_ccw=NULL;
1274         if ((p_env->packing >= PACK_SEND) &&
1275             (skb->cb[1] != 'P')) {
1276                 skb_push(skb,sizeof(struct clawph));
1277                 pk_head=(struct clawph *)skb->data;
1278                 pk_head->len=skb->len-sizeof(struct clawph);
1279                 if (pk_head->len%4)  {
1280                         pk_head->len+= 4-(pk_head->len%4);
1281                         skb_pad(skb,4-(pk_head->len%4));
1282                         skb_put(skb,4-(pk_head->len%4));
1283                 }
1284                 if (p_env->packing == DO_PACKED)
1285                         pk_head->link_num = linkid;
1286                 else
1287                         pk_head->link_num = 0;
1288                 pk_head->flag = 0x00;
1289                 skb_pad(skb,4);
1290                 skb->cb[1] = 'P';
1291         }
1292         if (linkid == 0) {
1293                 if (claw_check_busy(dev)) {
1294                         if (privptr->write_free_count!=0) {
1295                                 claw_clear_busy(dev);
1296                         }
1297                         else {
1298                                 claw_strt_out_IO(dev );
1299                                 claw_free_wrt_buf( dev );
1300                                 if (privptr->write_free_count==0) {
1301                                         ch = &privptr->channel[WRITE];
1302                                         atomic_inc(&skb->users);
1303                                         skb_queue_tail(&ch->collect_queue, skb);
1304                                         goto Done;
1305                                 }
1306                                 else {
1307                                         claw_clear_busy(dev);
1308                                 }
1309                         }
1310                 }
1311                 /*  tx lock  */
1312                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1313                         ch = &privptr->channel[WRITE];
1314                         atomic_inc(&skb->users);
1315                         skb_queue_tail(&ch->collect_queue, skb);
1316                         claw_strt_out_IO(dev );
1317                         rc=-EBUSY;
1318                         goto Done2;
1319                 }
1320         }
1321         /*      See how many write buffers are required to hold this data */
1322         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1323
1324         /*      If that number of buffers isn't available, give up for now */
1325         if (privptr->write_free_count < numBuffers ||
1326             privptr->p_write_free_chain == NULL ) {
1327
1328                 claw_setbit_busy(TB_NOBUFFER,dev);
1329                 ch = &privptr->channel[WRITE];
1330                 atomic_inc(&skb->users);
1331                 skb_queue_tail(&ch->collect_queue, skb);
1332                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1333                 goto Done2;
1334         }
1335         pDataAddress=skb->data;
1336         len_of_data=skb->len;
1337
1338         while (len_of_data > 0) {
1339                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1340                 if (p_this_ccw == NULL) { /* lost the race */
1341                         ch = &privptr->channel[WRITE];
1342                         atomic_inc(&skb->users);
1343                         skb_queue_tail(&ch->collect_queue, skb);
1344                         goto Done2;
1345                 }
1346                 privptr->p_write_free_chain=p_this_ccw->next;
1347                 p_this_ccw->next=NULL;
1348                 --privptr->write_free_count; /* -1 */
1349                 bytesInThisBuffer=len_of_data;
1350                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1351                 len_of_data-=bytesInThisBuffer;
1352                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1353                 /*      setup write CCW         */
1354                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1355                 if (len_of_data>0) {
1356                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1357                 }
1358                 p_this_ccw->write.count=bytesInThisBuffer;
1359                 /*      now add to end of this chain    */
1360                 if (p_first_ccw==NULL)    {
1361                         p_first_ccw=p_this_ccw;
1362                 }
1363                 if (p_last_ccw!=NULL) {
1364                         p_last_ccw->next=p_this_ccw;
1365                         /*      set up TIC ccws         */
1366                         p_last_ccw->w_TIC_1.cda=
1367                                 (__u32)__pa(&p_this_ccw->write);
1368                 }
1369                 p_last_ccw=p_this_ccw;      /* save new last block */
1370         }
1371
1372         /*      FirstCCW and LastCCW now contain a new set of write channel
1373         *       programs to append to the running channel program
1374         */
1375
1376         if (p_first_ccw!=NULL) {
1377                 /*      setup ending ccw sequence for this segment              */
1378                 pEnd=privptr->p_end_ccw;
1379                 if (pEnd->write1) {
1380                         pEnd->write1=0x00;   /* second end ccw is now active */
1381                         /*      set up Tic CCWs         */
1382                         p_last_ccw->w_TIC_1.cda=
1383                                 (__u32)__pa(&pEnd->write2_nop1);
1384                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1385                         pEnd->write2_nop2.flags    =
1386                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1387                         pEnd->write2_nop2.cda=0;
1388                         pEnd->write2_nop2.count=1;
1389                 }
1390                 else {  /*  end of if (pEnd->write1)*/
1391                         pEnd->write1=0x01;   /* first end ccw is now active */
1392                         /*      set up Tic CCWs         */
1393                         p_last_ccw->w_TIC_1.cda=
1394                                 (__u32)__pa(&pEnd->write1_nop1);
1395                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1396                         pEnd->write1_nop2.flags    =
1397                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1398                         pEnd->write1_nop2.cda=0;
1399                         pEnd->write1_nop2.count=1;
1400                 }  /* end if if (pEnd->write1) */
1401
1402                 if (privptr->p_write_active_first==NULL ) {
1403                         privptr->p_write_active_first=p_first_ccw;
1404                         privptr->p_write_active_last=p_last_ccw;
1405                 }
1406                 else {
1407                         /*      set up Tic CCWs         */
1408
1409                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1410                         tempCCW.count=0;
1411                         tempCCW.flags=0;
1412                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1413
1414                         if (pEnd->write1) {
1415
1416                  /*
1417                  * first set of ending CCW's is chained to the new write
1418                  * chain, so the second set is chained to the active chain
1419                  * Therefore modify the second set to point the new write chain.
1420                  * make sure we update the CCW atomically
1421                  * so channel does not fetch it when it's only half done
1422                  */
1423                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1424                                         sizeof(struct ccw1));
1425                                 privptr->p_write_active_last->w_TIC_1.cda=
1426                                         (__u32)__pa(&p_first_ccw->write);
1427                         }
1428                         else {
1429
1430                         /*make sure we update the CCW atomically
1431                          *so channel does not fetch it when it's only half done
1432                          */
1433                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1434                                         sizeof(struct ccw1));
1435                                 privptr->p_write_active_last->w_TIC_1.cda=
1436                                         (__u32)__pa(&p_first_ccw->write);
1437
1438                         } /* end if if (pEnd->write1) */
1439
1440                         privptr->p_write_active_last->next=p_first_ccw;
1441                         privptr->p_write_active_last=p_last_ccw;
1442                 }
1443
1444         } /* endif (p_first_ccw!=NULL)  */
1445         dev_kfree_skb_any(skb);
1446         if (linkid==0) {
1447                 lock=LOCK_NO;
1448         }
1449         else  {
1450                 lock=LOCK_YES;
1451         }
1452         claw_strt_out_IO(dev );
1453         /*      if write free count is zero , set NOBUFFER       */
1454         if (privptr->write_free_count==0) {
1455                 claw_setbit_busy(TB_NOBUFFER,dev);
1456         }
1457 Done2:
1458         claw_clearbit_busy(TB_TX,dev);
1459 Done:
1460         return(rc);
1461 }    /*    end of claw_hw_tx    */
1462
1463 /*-------------------------------------------------------------------*
1464 *                                                                    *
1465 *     init_ccw_bk                                                    *
1466 *                                                                    *
1467 *--------------------------------------------------------------------*/
1468
1469 static int
1470 init_ccw_bk(struct net_device *dev)
1471 {
1472
1473         __u32   ccw_blocks_required;
1474         __u32   ccw_blocks_perpage;
1475         __u32   ccw_pages_required;
1476         __u32   claw_reads_perpage=1;
1477         __u32   claw_read_pages;
1478         __u32   claw_writes_perpage=1;
1479         __u32   claw_write_pages;
1480         void    *p_buff=NULL;
1481         struct ccwbk*p_free_chain;
1482         struct ccwbk*p_buf;
1483         struct ccwbk*p_last_CCWB;
1484         struct ccwbk*p_first_CCWB;
1485         struct endccw *p_endccw=NULL;
1486         addr_t  real_address;
1487         struct claw_privbk *privptr=dev->priv;
1488         struct clawh *pClawH=NULL;
1489         addr_t   real_TIC_address;
1490         int i,j;
1491         CLAW_DBF_TEXT(4, trace, "init_ccw");
1492
1493         /*  initialize  statistics field */
1494         privptr->active_link_ID=0;
1495         /*  initialize  ccwbk pointers  */
1496         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1497         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1498         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1499         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1500         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1501         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1502         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1503         privptr->buffs_alloc = 0;
1504         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1505         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1506         /*  initialize  free write ccwbk counter  */
1507         privptr->write_free_count=0;  /* number of free bufs on write chain */
1508         p_last_CCWB = NULL;
1509         p_first_CCWB= NULL;
1510         /*
1511         *  We need 1 CCW block for each read buffer, 1 for each
1512         *  write buffer, plus 1 for ClawSignalBlock
1513         */
1514         ccw_blocks_required =
1515                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1516         /*
1517         * compute number of CCW blocks that will fit in a page
1518         */
1519         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1520         ccw_pages_required=
1521                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1522
1523         /*
1524          *  read and write sizes are set by 2 constants in claw.h
1525          *  4k and 32k.  Unpacked values other than 4k are not going to
1526          * provide good performance. With packing buffers support 32k
1527          * buffers are used.
1528          */
1529         if (privptr->p_env->read_size < PAGE_SIZE) {
1530                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1531                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1532                                                 claw_reads_perpage);
1533          }
1534          else {       /* > or equal  */
1535                 privptr->p_buff_pages_perread =
1536                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1537                 claw_read_pages = privptr->p_env->read_buffers *
1538                                         privptr->p_buff_pages_perread;
1539          }
1540         if (privptr->p_env->write_size < PAGE_SIZE) {
1541                 claw_writes_perpage =
1542                         PAGE_SIZE / privptr->p_env->write_size;
1543                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1544                                                 claw_writes_perpage);
1545
1546         }
1547         else {      /* >  or equal  */
1548                 privptr->p_buff_pages_perwrite =
1549                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1550                 claw_write_pages = privptr->p_env->write_buffers *
1551                                         privptr->p_buff_pages_perwrite;
1552         }
1553         /*
1554         *               allocate ccw_pages_required
1555         */
1556         if (privptr->p_buff_ccw==NULL) {
1557                 privptr->p_buff_ccw=
1558                         (void *)__get_free_pages(__GFP_DMA,
1559                         (int)pages_to_order_of_mag(ccw_pages_required ));
1560                 if (privptr->p_buff_ccw==NULL) {
1561                         return -ENOMEM;
1562                 }
1563                 privptr->p_buff_ccw_num=ccw_pages_required;
1564         }
1565         memset(privptr->p_buff_ccw, 0x00,
1566                 privptr->p_buff_ccw_num * PAGE_SIZE);
1567
1568         /*
1569         *               obtain ending ccw block address
1570         *
1571         */
1572         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1573         real_address  = (__u32)__pa(privptr->p_end_ccw);
1574         /*                              Initialize ending CCW block       */
1575         p_endccw=privptr->p_end_ccw;
1576         p_endccw->real=real_address;
1577         p_endccw->write1=0x00;
1578         p_endccw->read1=0x00;
1579
1580         /*      write1_nop1                                     */
1581         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1582         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1583         p_endccw->write1_nop1.count       = 1;
1584         p_endccw->write1_nop1.cda         = 0;
1585
1586         /*      write1_nop2                                     */
1587         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1588         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1589         p_endccw->write1_nop2.count      = 1;
1590         p_endccw->write1_nop2.cda        = 0;
1591
1592         /*      write2_nop1                                     */
1593         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1594         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1595         p_endccw->write2_nop1.count        = 1;
1596         p_endccw->write2_nop1.cda          = 0;
1597
1598         /*      write2_nop2                                     */
1599         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1600         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1601         p_endccw->write2_nop2.count        = 1;
1602         p_endccw->write2_nop2.cda          = 0;
1603
1604         /*      read1_nop1                                      */
1605         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1606         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1607         p_endccw->read1_nop1.count        = 1;
1608         p_endccw->read1_nop1.cda          = 0;
1609
1610         /*      read1_nop2                                      */
1611         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1612         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1613         p_endccw->read1_nop2.count        = 1;
1614         p_endccw->read1_nop2.cda          = 0;
1615
1616         /*      read2_nop1                                      */
1617         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1618         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1619         p_endccw->read2_nop1.count        = 1;
1620         p_endccw->read2_nop1.cda          = 0;
1621
1622         /*      read2_nop2                                      */
1623         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1624         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1625         p_endccw->read2_nop2.count        = 1;
1626         p_endccw->read2_nop2.cda          = 0;
1627
1628         /*
1629         *                               Build a chain of CCWs
1630         *
1631         */
1632         p_buff=privptr->p_buff_ccw;
1633
1634         p_free_chain=NULL;
1635         for (i=0 ; i < ccw_pages_required; i++ ) {
1636                 real_address  = (__u32)__pa(p_buff);
1637                 p_buf=p_buff;
1638                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1639                         p_buf->next  = p_free_chain;
1640                         p_free_chain = p_buf;
1641                         p_buf->real=(__u32)__pa(p_buf);
1642                         ++p_buf;
1643                 }
1644                 p_buff+=PAGE_SIZE;
1645         }
1646         /*
1647         *                               Initialize ClawSignalBlock
1648         *
1649         */
1650         if (privptr->p_claw_signal_blk==NULL) {
1651                 privptr->p_claw_signal_blk=p_free_chain;
1652                 p_free_chain=p_free_chain->next;
1653                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1654                 pClawH->length=0xffff;
1655                 pClawH->opcode=0xff;
1656                 pClawH->flag=CLAW_BUSY;
1657         }
1658
1659         /*
1660         *               allocate write_pages_required and add to free chain
1661         */
1662         if (privptr->p_buff_write==NULL) {
1663             if (privptr->p_env->write_size < PAGE_SIZE) {
1664                 privptr->p_buff_write=
1665                         (void *)__get_free_pages(__GFP_DMA,
1666                         (int)pages_to_order_of_mag(claw_write_pages ));
1667                 if (privptr->p_buff_write==NULL) {
1668                         privptr->p_buff_ccw=NULL;
1669                         return -ENOMEM;
1670                 }
1671                 /*
1672                 *                               Build CLAW write free chain
1673                 *
1674                 */
1675
1676                 memset(privptr->p_buff_write, 0x00,
1677                         ccw_pages_required * PAGE_SIZE);
1678                 privptr->p_write_free_chain=NULL;
1679
1680                 p_buff=privptr->p_buff_write;
1681
1682                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1683                         p_buf        = p_free_chain;      /*  get a CCW */
1684                         p_free_chain = p_buf->next;
1685                         p_buf->next  =privptr->p_write_free_chain;
1686                         privptr->p_write_free_chain = p_buf;
1687                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1688                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1689                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1690                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1691                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1692                         p_buf-> w_read_FF.count   = 1;
1693                         p_buf-> w_read_FF.cda     =
1694                                 (__u32)__pa(&p_buf-> header.flag);
1695                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1696                         p_buf-> w_TIC_1.flags      = 0;
1697                         p_buf-> w_TIC_1.count      = 0;
1698
1699                         if (((unsigned long)p_buff+privptr->p_env->write_size) >=
1700                            ((unsigned long)(p_buff+2*
1701                                 (privptr->p_env->write_size) -1) & PAGE_MASK)) {
1702                         p_buff= p_buff+privptr->p_env->write_size;
1703                         }
1704                 }
1705            }
1706            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1707            {
1708                privptr->p_write_free_chain=NULL;
1709                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1710                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1711                         (int)pages_to_order_of_mag(
1712                         privptr->p_buff_pages_perwrite) );
1713                    if (p_buff==NULL) {
1714                         free_pages((unsigned long)privptr->p_buff_ccw,
1715                               (int)pages_to_order_of_mag(
1716                                         privptr->p_buff_ccw_num));
1717                         privptr->p_buff_ccw=NULL;
1718                         p_buf=privptr->p_buff_write;
1719                         while (p_buf!=NULL) {
1720                                 free_pages((unsigned long)
1721                                         p_buf->p_buffer,
1722                                         (int)pages_to_order_of_mag(
1723                                         privptr->p_buff_pages_perwrite));
1724                                 p_buf=p_buf->next;
1725                         }
1726                         return -ENOMEM;
1727                    }  /* Error on get_pages   */
1728                    memset(p_buff, 0x00, privptr->p_env->write_size );
1729                    p_buf         = p_free_chain;
1730                    p_free_chain  = p_buf->next;
1731                    p_buf->next   = privptr->p_write_free_chain;
1732                    privptr->p_write_free_chain = p_buf;
1733                    privptr->p_buff_write = p_buf;
1734                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1735                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1736                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1737                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1738                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1739                    p_buf-> w_read_FF.count    = 1;
1740                    p_buf-> w_read_FF.cda      =
1741                         (__u32)__pa(&p_buf-> header.flag);
1742                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1743                    p_buf-> w_TIC_1.flags   = 0;
1744                    p_buf-> w_TIC_1.count   = 0;
1745                }  /* for all write_buffers   */
1746
1747            }    /* else buffers are PAGE_SIZE or bigger */
1748
1749         }
1750         privptr->p_buff_write_num=claw_write_pages;
1751         privptr->write_free_count=privptr->p_env->write_buffers;
1752
1753
1754         /*
1755         *               allocate read_pages_required and chain to free chain
1756         */
1757         if (privptr->p_buff_read==NULL) {
1758             if (privptr->p_env->read_size < PAGE_SIZE)  {
1759                 privptr->p_buff_read=
1760                         (void *)__get_free_pages(__GFP_DMA,
1761                         (int)pages_to_order_of_mag(claw_read_pages) );
1762                 if (privptr->p_buff_read==NULL) {
1763                         free_pages((unsigned long)privptr->p_buff_ccw,
1764                                 (int)pages_to_order_of_mag(
1765                                         privptr->p_buff_ccw_num));
1766                         /* free the write pages size is < page size  */
1767                         free_pages((unsigned long)privptr->p_buff_write,
1768                                 (int)pages_to_order_of_mag(
1769                                 privptr->p_buff_write_num));
1770                         privptr->p_buff_ccw=NULL;
1771                         privptr->p_buff_write=NULL;
1772                         return -ENOMEM;
1773                 }
1774                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1775                 privptr->p_buff_read_num=claw_read_pages;
1776                 /*
1777                 *                               Build CLAW read free chain
1778                 *
1779                 */
1780                 p_buff=privptr->p_buff_read;
1781                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1782                         p_buf        = p_free_chain;
1783                         p_free_chain = p_buf->next;
1784
1785                         if (p_last_CCWB==NULL) {
1786                                 p_buf->next=NULL;
1787                                 real_TIC_address=0;
1788                                 p_last_CCWB=p_buf;
1789                         }
1790                         else {
1791                                 p_buf->next=p_first_CCWB;
1792                                 real_TIC_address=
1793                                 (__u32)__pa(&p_first_CCWB -> read );
1794                         }
1795
1796                         p_first_CCWB=p_buf;
1797
1798                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1799                         /*  initialize read command */
1800                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1801                         p_buf-> read.cda = (__u32)__pa(p_buff);
1802                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1803                         p_buf-> read.count       = privptr->p_env->read_size;
1804
1805                         /*  initialize read_h command */
1806                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1807                         p_buf-> read_h.cda =
1808                                 (__u32)__pa(&(p_buf->header));
1809                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1810                         p_buf-> read_h.count      = sizeof(struct clawh);
1811
1812                         /*  initialize Signal command */
1813                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1814                         p_buf-> signal.cda =
1815                                 (__u32)__pa(&(pClawH->flag));
1816                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1817                         p_buf-> signal.count     = 1;
1818
1819                         /*  initialize r_TIC_1 command */
1820                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1821                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1822                         p_buf-> r_TIC_1.flags = 0;
1823                         p_buf-> r_TIC_1.count      = 0;
1824
1825                         /*  initialize r_read_FF command */
1826                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1827                         p_buf-> r_read_FF.cda =
1828                                 (__u32)__pa(&(pClawH->flag));
1829                         p_buf-> r_read_FF.flags =
1830                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1831                         p_buf-> r_read_FF.count    = 1;
1832
1833                         /*    initialize r_TIC_2          */
1834                         memcpy(&p_buf->r_TIC_2,
1835                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1836
1837                         /*     initialize Header     */
1838                         p_buf->header.length=0xffff;
1839                         p_buf->header.opcode=0xff;
1840                         p_buf->header.flag=CLAW_PENDING;
1841
1842                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1843                                 ((unsigned long)(p_buff+2*(privptr->p_env->read_size) -1)
1844                                  & PAGE_MASK) ) {
1845                                 p_buff= p_buff+privptr->p_env->read_size;
1846                         }
1847                         else {
1848                                 p_buff=
1849                                 (void *)((unsigned long)
1850                                         (p_buff+2*(privptr->p_env->read_size) -1)
1851                                          & PAGE_MASK) ;
1852                         }
1853                 }   /* for read_buffers   */
1854           }         /* read_size < PAGE_SIZE  */
1855           else {  /* read Size >= PAGE_SIZE  */
1856                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1857                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1858                                 (int)pages_to_order_of_mag(privptr->p_buff_pages_perread) );
1859                         if (p_buff==NULL) {
1860                                 free_pages((unsigned long)privptr->p_buff_ccw,
1861                                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
1862                                 /* free the write pages  */
1863                                 p_buf=privptr->p_buff_write;
1864                                 while (p_buf!=NULL) {
1865                                         free_pages((unsigned long)p_buf->p_buffer,
1866                                                 (int)pages_to_order_of_mag(
1867                                                 privptr->p_buff_pages_perwrite ));
1868                                         p_buf=p_buf->next;
1869                                 }
1870                                 /* free any read pages already alloc  */
1871                                 p_buf=privptr->p_buff_read;
1872                                 while (p_buf!=NULL) {
1873                                         free_pages((unsigned long)p_buf->p_buffer,
1874                                                 (int)pages_to_order_of_mag(
1875                                                 privptr->p_buff_pages_perread ));
1876                                         p_buf=p_buf->next;
1877                                 }
1878                                 privptr->p_buff_ccw=NULL;
1879                                 privptr->p_buff_write=NULL;
1880                                 return -ENOMEM;
1881                         }
1882                         memset(p_buff, 0x00, privptr->p_env->read_size);
1883                         p_buf        = p_free_chain;
1884                         privptr->p_buff_read = p_buf;
1885                         p_free_chain = p_buf->next;
1886
1887                         if (p_last_CCWB==NULL) {
1888                                 p_buf->next=NULL;
1889                                 real_TIC_address=0;
1890                                 p_last_CCWB=p_buf;
1891                         }
1892                         else {
1893                                 p_buf->next=p_first_CCWB;
1894                                 real_TIC_address=
1895                                         (addr_t)__pa(
1896                                                 &p_first_CCWB -> read );
1897                         }
1898
1899                         p_first_CCWB=p_buf;
1900                                 /* save buff address */
1901                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1902                         /*  initialize read command */
1903                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1904                         p_buf-> read.cda = (__u32)__pa(p_buff);
1905                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1906                         p_buf-> read.count       = privptr->p_env->read_size;
1907
1908                         /*  initialize read_h command */
1909                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1910                         p_buf-> read_h.cda =
1911                                 (__u32)__pa(&(p_buf->header));
1912                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1913                         p_buf-> read_h.count      = sizeof(struct clawh);
1914
1915                         /*  initialize Signal command */
1916                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1917                         p_buf-> signal.cda =
1918                                 (__u32)__pa(&(pClawH->flag));
1919                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1920                         p_buf-> signal.count     = 1;
1921
1922                         /*  initialize r_TIC_1 command */
1923                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1924                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1925                         p_buf-> r_TIC_1.flags = 0;
1926                         p_buf-> r_TIC_1.count      = 0;
1927
1928                         /*  initialize r_read_FF command */
1929                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1930                         p_buf-> r_read_FF.cda =
1931                                 (__u32)__pa(&(pClawH->flag));
1932                         p_buf-> r_read_FF.flags =
1933                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1934                         p_buf-> r_read_FF.count    = 1;
1935
1936                         /*    initialize r_TIC_2          */
1937                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1938                                 sizeof(struct ccw1));
1939
1940                         /*     initialize Header     */
1941                         p_buf->header.length=0xffff;
1942                         p_buf->header.opcode=0xff;
1943                         p_buf->header.flag=CLAW_PENDING;
1944
1945                 }    /* For read_buffers   */
1946           }     /*  read_size >= PAGE_SIZE   */
1947         }       /*  pBuffread = NULL */
1948         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1949         privptr->buffs_alloc = 1;
1950
1951         return 0;
1952 }    /*    end of init_ccw_bk */
1953
1954 /*-------------------------------------------------------------------*
1955 *                                                                    *
1956 *       probe_error                                                  *
1957 *                                                                    *
1958 *--------------------------------------------------------------------*/
1959
1960 static void
1961 probe_error( struct ccwgroup_device *cgdev)
1962 {
1963   struct claw_privbk *privptr;
1964
1965         CLAW_DBF_TEXT(4, trace, "proberr");
1966         privptr=(struct claw_privbk *)cgdev->dev.driver_data;
1967         if (privptr!=NULL) {
1968                 kfree(privptr->p_env);
1969                 privptr->p_env=NULL;
1970                 kfree(privptr->p_mtc_envelope);
1971                 privptr->p_mtc_envelope=NULL;
1972                 kfree(privptr);
1973                 privptr=NULL;
1974         }
1975         return;
1976 }    /*    probe_error    */
1977
1978 /*-------------------------------------------------------------------*
1979 *    claw_process_control                                            *
1980 *                                                                    *
1981 *                                                                    *
1982 *--------------------------------------------------------------------*/
1983
1984 static int
1985 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1986 {
1987
1988         struct clawbuf *p_buf;
1989         struct clawctl  ctlbk;
1990         struct clawctl *p_ctlbk;
1991         char    temp_host_name[8];
1992         char    temp_ws_name[8];
1993         struct claw_privbk *privptr;
1994         struct claw_env *p_env;
1995         struct sysval *p_sysval;
1996         struct conncmd *p_connect=NULL;
1997         int rc;
1998         struct chbk *p_ch = NULL;
1999         struct device *tdev;
2000         CLAW_DBF_TEXT(2, setup, "clw_cntl");
2001         udelay(1000);  /* Wait a ms for the control packets to
2002                         *catch up to each other */
2003         privptr=dev->priv;
2004         p_env=privptr->p_env;
2005         tdev = &privptr->channel[READ].cdev->dev;
2006         memcpy( &temp_host_name, p_env->host_name, 8);
2007         memcpy( &temp_ws_name, p_env->adapter_name , 8);
2008         printk(KERN_INFO "%s: CLAW device %.8s: "
2009                 "Received Control Packet\n",
2010                 dev->name, temp_ws_name);
2011         if (privptr->release_pend==1) {
2012                 return 0;
2013         }
2014         p_buf=p_ccw->p_buffer;
2015         p_ctlbk=&ctlbk;
2016         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2017                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2018         } else {
2019                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2020         }
2021         switch (p_ctlbk->command)
2022         {
2023         case SYSTEM_VALIDATE_REQUEST:
2024                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2025                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2026                                 CLAW_RC_WRONG_VERSION);
2027                         printk("%s: %d is wrong version id. "
2028                                "Expected %d\n",
2029                                dev->name, p_ctlbk->version,
2030                                CLAW_VERSION_ID);
2031                 }
2032                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2033                 printk("%s: Recv Sys Validate Request: "
2034                        "Vers=%d,link_id=%d,Corr=%d,WS name=%."
2035                        "8s,Host name=%.8s\n",
2036                        dev->name, p_ctlbk->version,
2037                        p_ctlbk->linkid,
2038                        p_ctlbk->correlator,
2039                        p_sysval->WS_name,
2040                        p_sysval->host_name);
2041                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2042                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2043                                 CLAW_RC_NAME_MISMATCH);
2044                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2045                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2046                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2047                         printk(KERN_INFO "%s:  Host name mismatch\n",
2048                                 dev->name);
2049                         printk(KERN_INFO "%s: Received :%s: "
2050                                 "expected :%s: \n",
2051                                 dev->name,
2052                                 p_sysval->host_name,
2053                                 temp_host_name);
2054                 }
2055                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2056                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2057                                 CLAW_RC_NAME_MISMATCH);
2058                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2059                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2060                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2061                         printk(KERN_INFO "%s: WS name mismatch\n",
2062                                 dev->name);
2063                         printk(KERN_INFO "%s: Received :%s: "
2064                                "expected :%s: \n",
2065                                dev->name,
2066                                p_sysval->WS_name,
2067                                temp_ws_name);
2068                 }
2069                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2070                     (p_env->packing == 0)) {
2071                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2072                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2073                         printk(KERN_INFO "%s: host write size is too "
2074                                 "small\n", dev->name);
2075                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2076                 }
2077                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2078                     (p_env->packing == 0)) {
2079                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2080                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2081                         printk(KERN_INFO "%s: host read size is too "
2082                                 "small\n", dev->name);
2083                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2084                 }
2085                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2086                 printk(KERN_INFO "%s: CLAW device %.8s: System validate "
2087                         "completed.\n", dev->name, temp_ws_name);
2088                 printk("%s: sys Validate Rsize:%d Wsize:%d\n", dev->name,
2089                         p_sysval->read_frame_size, p_sysval->write_frame_size);
2090                 privptr->system_validate_comp = 1;
2091                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2092                         p_env->packing = PACKING_ASK;
2093                 claw_strt_conn_req(dev);
2094                 break;
2095         case SYSTEM_VALIDATE_RESPONSE:
2096                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2097                 printk("%s: Recv Sys Validate Resp: Vers=%d,Corr=%d,RC=%d,"
2098                         "WS name=%.8s,Host name=%.8s\n",
2099                         dev->name,
2100                         p_ctlbk->version,
2101                         p_ctlbk->correlator,
2102                         p_ctlbk->rc,
2103                         p_sysval->WS_name,
2104                         p_sysval->host_name);
2105                 switch (p_ctlbk->rc) {
2106                 case 0:
2107                         printk(KERN_INFO "%s: CLAW device "
2108                                 "%.8s: System validate "
2109                                 "completed.\n",
2110                                dev->name, temp_ws_name);
2111                         if (privptr->system_validate_comp == 0)
2112                                 claw_strt_conn_req(dev);
2113                         privptr->system_validate_comp = 1;
2114                         break;
2115                 case CLAW_RC_NAME_MISMATCH:
2116                         printk(KERN_INFO "%s: Sys Validate "
2117                                 "Resp : Host, WS name is "
2118                                 "mismatch\n",
2119                                dev->name);
2120                         break;
2121                 case CLAW_RC_WRONG_VERSION:
2122                         printk(KERN_INFO "%s: Sys Validate "
2123                                 "Resp : Wrong version\n",
2124                                 dev->name);
2125                         break;
2126                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2127                         printk(KERN_INFO "%s: Sys Validate "
2128                                 "Resp : bad frame size\n",
2129                                 dev->name);
2130                         break;
2131                 default:
2132                         printk(KERN_INFO "%s: Sys Validate "
2133                                 "error code=%d \n",
2134                                  dev->name, p_ctlbk->rc);
2135                         break;
2136                 }
2137                 break;
2138
2139         case CONNECTION_REQUEST:
2140                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2141                 printk(KERN_INFO "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2142                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2143                         dev->name,
2144                         p_ctlbk->version,
2145                         p_ctlbk->linkid,
2146                         p_ctlbk->correlator,
2147                         p_connect->host_name,
2148                         p_connect->WS_name);
2149                 if (privptr->active_link_ID != 0) {
2150                         claw_snd_disc(dev, p_ctlbk);
2151                         printk(KERN_INFO "%s: Conn Req error : "
2152                                 "already logical link is active \n",
2153                                 dev->name);
2154                 }
2155                 if (p_ctlbk->linkid != 1) {
2156                         claw_snd_disc(dev, p_ctlbk);
2157                         printk(KERN_INFO "%s: Conn Req error : "
2158                                 "req logical link id is not 1\n",
2159                                 dev->name);
2160                 }
2161                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2162                 if (rc != 0) {
2163                         claw_snd_disc(dev, p_ctlbk);
2164                         printk(KERN_INFO "%s: Conn Resp error: "
2165                                 "req appl name does not match\n",
2166                                 dev->name);
2167                 }
2168                 claw_send_control(dev,
2169                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2170                         p_ctlbk->correlator,
2171                         0, p_connect->host_name,
2172                         p_connect->WS_name);
2173                 if (p_env->packing == PACKING_ASK) {
2174                         p_env->packing = PACK_SEND;
2175                         claw_snd_conn_req(dev, 0);
2176                 }
2177                 printk(KERN_INFO "%s: CLAW device %.8s: Connection "
2178                         "completed link_id=%d.\n",
2179                         dev->name, temp_ws_name,
2180                         p_ctlbk->linkid);
2181                         privptr->active_link_ID = p_ctlbk->linkid;
2182                         p_ch = &privptr->channel[WRITE];
2183                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2184                 break;
2185         case CONNECTION_RESPONSE:
2186                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2187                 printk(KERN_INFO "%s: Revc Conn Resp: Vers=%d,link_id=%d,"
2188                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2189                         dev->name,
2190                         p_ctlbk->version,
2191                         p_ctlbk->linkid,
2192                         p_ctlbk->correlator,
2193                         p_ctlbk->rc,
2194                         p_connect->host_name,
2195                         p_connect->WS_name);
2196
2197                 if (p_ctlbk->rc != 0) {
2198                         printk(KERN_INFO "%s: Conn Resp error: rc=%d \n",
2199                                 dev->name, p_ctlbk->rc);
2200                         return 1;
2201                 }
2202                 rc = find_link(dev,
2203                         p_connect->host_name, p_connect->WS_name);
2204                 if (rc != 0) {
2205                         claw_snd_disc(dev, p_ctlbk);
2206                         printk(KERN_INFO "%s: Conn Resp error: "
2207                                 "req appl name does not match\n",
2208                                  dev->name);
2209                 }
2210                 /* should be until CONNECTION_CONFIRM */
2211                 privptr->active_link_ID = -(p_ctlbk->linkid);
2212                 break;
2213         case CONNECTION_CONFIRM:
2214                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2215                 printk(KERN_INFO "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2216                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2217                         dev->name,
2218                         p_ctlbk->version,
2219                         p_ctlbk->linkid,
2220                         p_ctlbk->correlator,
2221                         p_connect->host_name,
2222                         p_connect->WS_name);
2223                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2224                         privptr->active_link_ID = p_ctlbk->linkid;
2225                         if (p_env->packing > PACKING_ASK) {
2226                                 printk(KERN_INFO "%s: Confirmed Now packing\n",
2227                                         dev->name);
2228                                 p_env->packing = DO_PACKED;
2229                         }
2230                         p_ch = &privptr->channel[WRITE];
2231                         wake_up(&p_ch->wait);
2232                 } else {
2233                        printk(KERN_INFO "%s: Conn confirm: "
2234                                 "unexpected linkid=%d \n",
2235                                 dev->name, p_ctlbk->linkid);
2236                         claw_snd_disc(dev, p_ctlbk);
2237                 }
2238                 break;
2239         case DISCONNECT:
2240                 printk(KERN_INFO "%s: Disconnect: "
2241                         "Vers=%d,link_id=%d,Corr=%d\n",
2242                         dev->name, p_ctlbk->version,
2243                         p_ctlbk->linkid, p_ctlbk->correlator);
2244                 if ((p_ctlbk->linkid == 2) &&
2245                     (p_env->packing == PACK_SEND)) {
2246                         privptr->active_link_ID = 1;
2247                         p_env->packing = DO_PACKED;
2248                 } else
2249                         privptr->active_link_ID = 0;
2250                 break;
2251         case CLAW_ERROR:
2252                 printk(KERN_INFO "%s: CLAW ERROR detected\n",
2253                         dev->name);
2254                 break;
2255         default:
2256                 printk(KERN_INFO "%s:  Unexpected command code=%d \n",
2257                         dev->name,  p_ctlbk->command);
2258                 break;
2259         }
2260
2261         return 0;
2262 }   /*    end of claw_process_control    */
2263
2264
2265 /*-------------------------------------------------------------------*
2266 *               claw_send_control                                    *
2267 *                                                                    *
2268 *--------------------------------------------------------------------*/
2269
2270 static int
2271 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2272          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2273 {
2274         struct claw_privbk              *privptr;
2275         struct clawctl                  *p_ctl;
2276         struct sysval                   *p_sysval;
2277         struct conncmd                  *p_connect;
2278         struct sk_buff                  *skb;
2279
2280         CLAW_DBF_TEXT(2, setup, "sndcntl");
2281         privptr=dev->priv;
2282         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2283
2284         p_ctl->command=type;
2285         p_ctl->version=CLAW_VERSION_ID;
2286         p_ctl->linkid=link;
2287         p_ctl->correlator=correlator;
2288         p_ctl->rc=rc;
2289
2290         p_sysval=(struct sysval *)&p_ctl->data;
2291         p_connect=(struct conncmd *)&p_ctl->data;
2292
2293         switch (p_ctl->command) {
2294                 case SYSTEM_VALIDATE_REQUEST:
2295                 case SYSTEM_VALIDATE_RESPONSE:
2296                         memcpy(&p_sysval->host_name, local_name, 8);
2297                         memcpy(&p_sysval->WS_name, remote_name, 8);
2298                         if (privptr->p_env->packing > 0) {
2299                                 p_sysval->read_frame_size=DEF_PACK_BUFSIZE;
2300                                 p_sysval->write_frame_size=DEF_PACK_BUFSIZE;
2301                         } else {
2302                                 /* how big is the biggest group of packets */
2303                                 p_sysval->read_frame_size=privptr->p_env->read_size;
2304                                 p_sysval->write_frame_size=privptr->p_env->write_size;
2305                         }
2306                         memset(&p_sysval->reserved, 0x00, 4);
2307                         break;
2308                 case CONNECTION_REQUEST:
2309                 case CONNECTION_RESPONSE:
2310                 case CONNECTION_CONFIRM:
2311                 case DISCONNECT:
2312                         memcpy(&p_sysval->host_name, local_name, 8);
2313                         memcpy(&p_sysval->WS_name, remote_name, 8);
2314                         if (privptr->p_env->packing > 0) {
2315                         /* How big is the biggest packet */
2316                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2317                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2318                         } else {
2319                                 memset(&p_connect->reserved1, 0x00, 4);
2320                                 memset(&p_connect->reserved2, 0x00, 4);
2321                         }
2322                         break;
2323                 default:
2324                         break;
2325         }
2326
2327         /*      write Control Record to the device                   */
2328
2329
2330         skb = dev_alloc_skb(sizeof(struct clawctl));
2331         if (!skb) {
2332                 return -ENOMEM;
2333         }
2334         memcpy(skb_put(skb, sizeof(struct clawctl)),
2335                 p_ctl, sizeof(struct clawctl));
2336         if (privptr->p_env->packing >= PACK_SEND)
2337                 claw_hw_tx(skb, dev, 1);
2338         else
2339                 claw_hw_tx(skb, dev, 0);
2340         return 0;
2341 }  /*   end of claw_send_control  */
2342
2343 /*-------------------------------------------------------------------*
2344 *               claw_snd_conn_req                                    *
2345 *                                                                    *
2346 *--------------------------------------------------------------------*/
2347 static int
2348 claw_snd_conn_req(struct net_device *dev, __u8 link)
2349 {
2350         int                rc;
2351         struct claw_privbk *privptr=dev->priv;
2352         struct clawctl     *p_ctl;
2353
2354         CLAW_DBF_TEXT(2, setup, "snd_conn");
2355         rc = 1;
2356         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2357         p_ctl->linkid = link;
2358         if ( privptr->system_validate_comp==0x00 ) {
2359                 return rc;
2360         }
2361         if (privptr->p_env->packing == PACKING_ASK )
2362                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2363                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2364         if (privptr->p_env->packing == PACK_SEND)  {
2365                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2366                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2367         }
2368         if (privptr->p_env->packing == 0)
2369                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2370                         HOST_APPL_NAME, privptr->p_env->api_type);
2371         return rc;
2372
2373 }  /*  end of claw_snd_conn_req */
2374
2375
2376 /*-------------------------------------------------------------------*
2377 *               claw_snd_disc                                        *
2378 *                                                                    *
2379 *--------------------------------------------------------------------*/
2380
2381 static int
2382 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2383 {
2384         int rc;
2385         struct conncmd *  p_connect;
2386
2387         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2388         p_connect=(struct conncmd *)&p_ctl->data;
2389
2390         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2391                 p_ctl->correlator, 0,
2392                 p_connect->host_name, p_connect->WS_name);
2393         return rc;
2394 }     /*   end of claw_snd_disc    */
2395
2396
2397 /*-------------------------------------------------------------------*
2398 *               claw_snd_sys_validate_rsp                            *
2399 *                                                                    *
2400 *--------------------------------------------------------------------*/
2401
2402 static int
2403 claw_snd_sys_validate_rsp(struct net_device *dev,
2404         struct clawctl *p_ctl, __u32 return_code)
2405 {
2406         struct claw_env *  p_env;
2407         struct claw_privbk *privptr;
2408         int    rc;
2409
2410         CLAW_DBF_TEXT(2, setup, "chkresp");
2411         privptr = dev->priv;
2412         p_env=privptr->p_env;
2413         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2414                 p_ctl->linkid,
2415                 p_ctl->correlator,
2416                 return_code,
2417                 p_env->host_name,
2418                 p_env->adapter_name  );
2419         return rc;
2420 }     /*    end of claw_snd_sys_validate_rsp    */
2421
2422 /*-------------------------------------------------------------------*
2423 *               claw_strt_conn_req                                   *
2424 *                                                                    *
2425 *--------------------------------------------------------------------*/
2426
2427 static int
2428 claw_strt_conn_req(struct net_device *dev )
2429 {
2430         int rc;
2431
2432         CLAW_DBF_TEXT(2, setup, "conn_req");
2433         rc=claw_snd_conn_req(dev, 1);
2434         return rc;
2435 }    /*   end of claw_strt_conn_req   */
2436
2437
2438
2439 /*-------------------------------------------------------------------*
2440  *   claw_stats                                                      *
2441  *-------------------------------------------------------------------*/
2442
2443 static struct
2444 net_device_stats *claw_stats(struct net_device *dev)
2445 {
2446         struct claw_privbk *privptr;
2447
2448         CLAW_DBF_TEXT(4, trace, "stats");
2449         privptr = dev->priv;
2450         return &privptr->stats;
2451 }     /*   end of claw_stats   */
2452
2453
2454 /*-------------------------------------------------------------------*
2455 *       unpack_read                                                  *
2456 *                                                                    *
2457 *--------------------------------------------------------------------*/
2458 static void
2459 unpack_read(struct net_device *dev )
2460 {
2461         struct sk_buff *skb;
2462         struct claw_privbk *privptr;
2463         struct claw_env    *p_env;
2464         struct ccwbk    *p_this_ccw;
2465         struct ccwbk    *p_first_ccw;
2466         struct ccwbk    *p_last_ccw;
2467         struct clawph   *p_packh;
2468         void            *p_packd;
2469         struct clawctl  *p_ctlrec=NULL;
2470         struct device   *p_dev;
2471
2472         __u32   len_of_data;
2473         __u32   pack_off;
2474         __u8    link_num;
2475         __u8    mtc_this_frm=0;
2476         __u32   bytes_to_mov;
2477         int     i=0;
2478         int     p=0;
2479
2480         CLAW_DBF_TEXT(4, trace, "unpkread");
2481         p_first_ccw=NULL;
2482         p_last_ccw=NULL;
2483         p_packh=NULL;
2484         p_packd=NULL;
2485         privptr=dev->priv;
2486
2487         p_dev = &privptr->channel[READ].cdev->dev;
2488         p_env = privptr->p_env;
2489         p_this_ccw=privptr->p_read_active_first;
2490         i=0;
2491         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2492                 pack_off = 0;
2493                 p = 0;
2494                 p_this_ccw->header.flag=CLAW_PENDING;
2495                 privptr->p_read_active_first=p_this_ccw->next;
2496                 p_this_ccw->next=NULL;
2497                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2498                 if ((p_env->packing == PACK_SEND) &&
2499                     (p_packh->len == 32)           &&
2500                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2501                         p_packh++;  /* peek past pack header */
2502                         p_ctlrec = (struct clawctl *)p_packh;
2503                         p_packh--;  /* un peek */
2504                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2505                             (p_ctlrec->command == CONNECTION_CONFIRM))
2506                                 p_env->packing = DO_PACKED;
2507                 }
2508                 if (p_env->packing == DO_PACKED)
2509                         link_num=p_packh->link_num;
2510                 else
2511                         link_num=p_this_ccw->header.opcode / 8;
2512                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2513                         mtc_this_frm=1;
2514                         if (p_this_ccw->header.length!=
2515                                 privptr->p_env->read_size ) {
2516                                 printk(KERN_INFO " %s: Invalid frame detected "
2517                                         "length is %02x\n" ,
2518                                         dev->name, p_this_ccw->header.length);
2519                         }
2520                 }
2521
2522                 if (privptr->mtc_skipping) {
2523                         /*
2524                         *   We're in the mode of skipping past a
2525                         *   multi-frame message
2526                         *   that we can't process for some reason or other.
2527                         *   The first frame without the More-To-Come flag is
2528                         *   the last frame of the skipped message.
2529                         */
2530                         /*  in case of More-To-Come not set in this frame */
2531                         if (mtc_this_frm==0) {
2532                                 privptr->mtc_skipping=0; /* Ok, the end */
2533                                 privptr->mtc_logical_link=-1;
2534                         }
2535                         goto NextFrame;
2536                 }
2537
2538                 if (link_num==0) {
2539                         claw_process_control(dev, p_this_ccw);
2540                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2541                         goto NextFrame;
2542                 }
2543 unpack_next:
2544                 if (p_env->packing == DO_PACKED) {
2545                         if (pack_off > p_env->read_size)
2546                                 goto NextFrame;
2547                         p_packd = p_this_ccw->p_buffer+pack_off;
2548                         p_packh = (struct clawph *) p_packd;
2549                         if ((p_packh->len == 0) || /* all done with this frame? */
2550                             (p_packh->flag != 0))
2551                                 goto NextFrame;
2552                         bytes_to_mov = p_packh->len;
2553                         pack_off += bytes_to_mov+sizeof(struct clawph);
2554                         p++;
2555                 } else {
2556                         bytes_to_mov=p_this_ccw->header.length;
2557                 }
2558                 if (privptr->mtc_logical_link<0) {
2559
2560                 /*
2561                 *  if More-To-Come is set in this frame then we don't know
2562                 *  length of entire message, and hence have to allocate
2563                 *  large buffer   */
2564
2565                 /*      We are starting a new envelope  */
2566                 privptr->mtc_offset=0;
2567                         privptr->mtc_logical_link=link_num;
2568                 }
2569
2570                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2571                         /*      error     */
2572                         privptr->stats.rx_frame_errors++;
2573                         goto NextFrame;
2574                 }
2575                 if (p_env->packing == DO_PACKED) {
2576                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2577                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2578
2579                 } else  {
2580                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2581                                 p_this_ccw->p_buffer, bytes_to_mov);
2582                 }
2583                 if (mtc_this_frm==0) {
2584                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2585                         skb=dev_alloc_skb(len_of_data);
2586                         if (skb) {
2587                                 memcpy(skb_put(skb,len_of_data),
2588                                         privptr->p_mtc_envelope,
2589                                         len_of_data);
2590                                 skb->dev=dev;
2591                                 skb_reset_mac_header(skb);
2592                                 skb->protocol=htons(ETH_P_IP);
2593                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2594                                 privptr->stats.rx_packets++;
2595                                 privptr->stats.rx_bytes+=len_of_data;
2596                                 netif_rx(skb);
2597                         }
2598                         else {
2599                                 privptr->stats.rx_dropped++;
2600                                 printk(KERN_WARNING "%s: %s() low on memory\n",
2601                                 dev->name,__func__);
2602                         }
2603                         privptr->mtc_offset=0;
2604                         privptr->mtc_logical_link=-1;
2605                 }
2606                 else {
2607                         privptr->mtc_offset+=bytes_to_mov;
2608                 }
2609                 if (p_env->packing == DO_PACKED)
2610                         goto unpack_next;
2611 NextFrame:
2612                 /*
2613                 *   Remove ThisCCWblock from active read queue, and add it
2614                 *   to queue of free blocks to be reused.
2615                 */
2616                 i++;
2617                 p_this_ccw->header.length=0xffff;
2618                 p_this_ccw->header.opcode=0xff;
2619                 /*
2620                 *       add this one to the free queue for later reuse
2621                 */
2622                 if (p_first_ccw==NULL) {
2623                         p_first_ccw = p_this_ccw;
2624                 }
2625                 else {
2626                         p_last_ccw->next = p_this_ccw;
2627                 }
2628                 p_last_ccw = p_this_ccw;
2629                 /*
2630                 *       chain to next block on active read queue
2631                 */
2632                 p_this_ccw = privptr->p_read_active_first;
2633                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2634         } /* end of while */
2635
2636         /*      check validity                  */
2637
2638         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2639         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2640         claw_strt_read(dev, LOCK_YES);
2641         return;
2642 }     /*  end of unpack_read   */
2643
2644 /*-------------------------------------------------------------------*
2645 *       claw_strt_read                                               *
2646 *                                                                    *
2647 *--------------------------------------------------------------------*/
2648 static void
2649 claw_strt_read (struct net_device *dev, int lock )
2650 {
2651         int        rc = 0;
2652         __u32      parm;
2653         unsigned long  saveflags = 0;
2654         struct claw_privbk *privptr=dev->priv;
2655         struct ccwbk*p_ccwbk;
2656         struct chbk *p_ch;
2657         struct clawh *p_clawh;
2658         p_ch=&privptr->channel[READ];
2659
2660         CLAW_DBF_TEXT(4, trace, "StRdNter");
2661         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2662         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2663
2664         if ((privptr->p_write_active_first!=NULL &&
2665              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2666             (privptr->p_read_active_first!=NULL &&
2667              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2668                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2669         }
2670         if (lock==LOCK_YES) {
2671                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2672         }
2673         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2674                 CLAW_DBF_TEXT(4, trace, "HotRead");
2675                 p_ccwbk=privptr->p_read_active_first;
2676                 parm = (unsigned long) p_ch;
2677                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2678                                        0xff, 0);
2679                 if (rc != 0) {
2680                         ccw_check_return_code(p_ch->cdev, rc);
2681                 }
2682         }
2683         else {
2684                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2685         }
2686
2687         if (lock==LOCK_YES) {
2688                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2689         }
2690         CLAW_DBF_TEXT(4, trace, "StRdExit");
2691         return;
2692 }       /*    end of claw_strt_read    */
2693
2694 /*-------------------------------------------------------------------*
2695 *       claw_strt_out_IO                                             *
2696 *                                                                    *
2697 *--------------------------------------------------------------------*/
2698
2699 static void
2700 claw_strt_out_IO( struct net_device *dev )
2701 {
2702         int                     rc = 0;
2703         unsigned long           parm;
2704         struct claw_privbk      *privptr;
2705         struct chbk             *p_ch;
2706         struct ccwbk    *p_first_ccw;
2707
2708         if (!dev) {
2709                 return;
2710         }
2711         privptr=(struct claw_privbk *)dev->priv;
2712         p_ch=&privptr->channel[WRITE];
2713
2714         CLAW_DBF_TEXT(4, trace, "strt_io");
2715         p_first_ccw=privptr->p_write_active_first;
2716
2717         if (p_ch->claw_state == CLAW_STOP)
2718                 return;
2719         if (p_first_ccw == NULL) {
2720                 return;
2721         }
2722         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2723                 parm = (unsigned long) p_ch;
2724                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2725                 rc = ccw_device_start (p_ch->cdev,&p_first_ccw->write, parm,
2726                                        0xff, 0);
2727                 if (rc != 0) {
2728                         ccw_check_return_code(p_ch->cdev, rc);
2729                 }
2730         }
2731         dev->trans_start = jiffies;
2732         return;
2733 }       /*    end of claw_strt_out_IO    */
2734
2735 /*-------------------------------------------------------------------*
2736 *       Free write buffers                                           *
2737 *                                                                    *
2738 *--------------------------------------------------------------------*/
2739
2740 static void
2741 claw_free_wrt_buf( struct net_device *dev )
2742 {
2743
2744         struct claw_privbk *privptr=(struct claw_privbk *)dev->priv;
2745         struct ccwbk*p_first_ccw;
2746         struct ccwbk*p_last_ccw;
2747         struct ccwbk*p_this_ccw;
2748         struct ccwbk*p_next_ccw;
2749
2750         CLAW_DBF_TEXT(4, trace, "freewrtb");
2751         /*  scan the write queue to free any completed write packets   */
2752         p_first_ccw=NULL;
2753         p_last_ccw=NULL;
2754         p_this_ccw=privptr->p_write_active_first;
2755         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2756         {
2757                 p_next_ccw = p_this_ccw->next;
2758                 if (((p_next_ccw!=NULL) &&
2759                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2760                     ((p_this_ccw == privptr->p_write_active_last) &&
2761                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2762                         /* The next CCW is OK or this is  */
2763                         /* the last CCW...free it   @A1A  */
2764                         privptr->p_write_active_first=p_this_ccw->next;
2765                         p_this_ccw->header.flag=CLAW_PENDING;
2766                         p_this_ccw->next=privptr->p_write_free_chain;
2767                         privptr->p_write_free_chain=p_this_ccw;
2768                         ++privptr->write_free_count;
2769                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2770                         p_this_ccw=privptr->p_write_active_first;
2771                         privptr->stats.tx_packets++;
2772                 }
2773                 else {
2774                         break;
2775                 }
2776         }
2777         if (privptr->write_free_count!=0) {
2778                 claw_clearbit_busy(TB_NOBUFFER,dev);
2779         }
2780         /*   whole chain removed?   */
2781         if (privptr->p_write_active_first==NULL) {
2782                 privptr->p_write_active_last=NULL;
2783         }
2784         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2785         return;
2786 }
2787
2788 /*-------------------------------------------------------------------*
2789 *       claw free netdevice                                          *
2790 *                                                                    *
2791 *--------------------------------------------------------------------*/
2792 static void
2793 claw_free_netdevice(struct net_device * dev, int free_dev)
2794 {
2795         struct claw_privbk *privptr;
2796
2797         CLAW_DBF_TEXT(2, setup, "free_dev");
2798         if (!dev)
2799                 return;
2800         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2801         privptr = dev->priv;
2802         if (dev->flags & IFF_RUNNING)
2803                 claw_release(dev);
2804         if (privptr) {
2805                 privptr->channel[READ].ndev = NULL;  /* say it's free */
2806         }
2807         dev->priv=NULL;
2808 #ifdef MODULE
2809         if (free_dev) {
2810                 free_netdev(dev);
2811         }
2812 #endif
2813         CLAW_DBF_TEXT(2, setup, "free_ok");
2814 }
2815
2816 /**
2817  * Claw init netdevice
2818  * Initialize everything of the net device except the name and the
2819  * channel structs.
2820  */
2821 static void
2822 claw_init_netdevice(struct net_device * dev)
2823 {
2824         CLAW_DBF_TEXT(2, setup, "init_dev");
2825         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2826         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2827         dev->hard_start_xmit = claw_tx;
2828         dev->open = claw_open;
2829         dev->stop = claw_release;
2830         dev->get_stats = claw_stats;
2831         dev->change_mtu = claw_change_mtu;
2832         dev->hard_header_len = 0;
2833         dev->addr_len = 0;
2834         dev->type = ARPHRD_SLIP;
2835         dev->tx_queue_len = 1300;
2836         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2837         CLAW_DBF_TEXT(2, setup, "initok");
2838         return;
2839 }
2840
2841 /**
2842  * Init a new channel in the privptr->channel[i].
2843  *
2844  * @param cdev  The ccw_device to be added.
2845  *
2846  * @return 0 on success, !0 on error.
2847  */
2848 static int
2849 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2850 {
2851         struct chbk *p_ch;
2852         struct ccw_dev_id dev_id;
2853
2854         CLAW_DBF_TEXT_(2, setup, "%s", cdev->dev.bus_id);
2855         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2856         p_ch = &privptr->channel[i];
2857         p_ch->cdev = cdev;
2858         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", cdev->dev.bus_id);
2859         ccw_device_get_id(cdev, &dev_id);
2860         p_ch->devno = dev_id.devno;
2861         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2862                 return -ENOMEM;
2863         }
2864         return 0;
2865 }
2866
2867
2868 /**
2869  *
2870  * Setup an interface.
2871  *
2872  * @param cgdev  Device to be setup.
2873  *
2874  * @returns 0 on success, !0 on failure.
2875  */
2876 static int
2877 claw_new_device(struct ccwgroup_device *cgdev)
2878 {
2879         struct claw_privbk *privptr;
2880         struct claw_env *p_env;
2881         struct net_device *dev;
2882         int ret;
2883         struct ccw_dev_id dev_id;
2884
2885         printk(KERN_INFO "claw: add for %s\n",cgdev->cdev[READ]->dev.bus_id);
2886         CLAW_DBF_TEXT(2, setup, "new_dev");
2887         privptr = cgdev->dev.driver_data;
2888         cgdev->cdev[READ]->dev.driver_data = privptr;
2889         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2890         if (!privptr)
2891                 return -ENODEV;
2892         p_env = privptr->p_env;
2893         ccw_device_get_id(cgdev->cdev[READ], &dev_id);
2894         p_env->devno[READ] = dev_id.devno;
2895         ccw_device_get_id(cgdev->cdev[WRITE], &dev_id);
2896         p_env->devno[WRITE] = dev_id.devno;
2897         ret = add_channel(cgdev->cdev[0],0,privptr);
2898         if (ret == 0)
2899                 ret = add_channel(cgdev->cdev[1],1,privptr);
2900         if (ret != 0) {
2901                 printk(KERN_WARNING
2902                         "add channel failed with ret = %d\n", ret);
2903                 goto out;
2904         }
2905         ret = ccw_device_set_online(cgdev->cdev[READ]);
2906         if (ret != 0) {
2907                 printk(KERN_WARNING
2908                         "claw: ccw_device_set_online %s READ failed "
2909                         "with ret = %d\n",cgdev->cdev[READ]->dev.bus_id,ret);
2910                 goto out;
2911         }
2912         ret = ccw_device_set_online(cgdev->cdev[WRITE]);
2913         if (ret != 0) {
2914                 printk(KERN_WARNING
2915                         "claw: ccw_device_set_online %s WRITE failed "
2916                         "with ret = %d\n",cgdev->cdev[WRITE]->dev.bus_id, ret);
2917                 goto out;
2918         }
2919         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2920         if (!dev) {
2921                 printk(KERN_WARNING "%s:alloc_netdev failed\n",__func__);
2922                 goto out;
2923         }
2924         dev->priv = privptr;
2925         cgdev->dev.driver_data = privptr;
2926         cgdev->cdev[READ]->dev.driver_data = privptr;
2927         cgdev->cdev[WRITE]->dev.driver_data = privptr;
2928         /* sysfs magic */
2929         SET_NETDEV_DEV(dev, &cgdev->dev);
2930         if (register_netdev(dev) != 0) {
2931                 claw_free_netdevice(dev, 1);
2932                 CLAW_DBF_TEXT(2, trace, "regfail");
2933                 goto out;
2934         }
2935         dev->flags &=~IFF_RUNNING;
2936         if (privptr->buffs_alloc == 0) {
2937                 ret=init_ccw_bk(dev);
2938                 if (ret !=0) {
2939                         unregister_netdev(dev);
2940                         claw_free_netdevice(dev,1);
2941                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2942                         goto out;
2943                 }
2944         }
2945         privptr->channel[READ].ndev = dev;
2946         privptr->channel[WRITE].ndev = dev;
2947         privptr->p_env->ndev = dev;
2948
2949         printk(KERN_INFO "%s:readsize=%d  writesize=%d "
2950                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2951                 dev->name, p_env->read_size,
2952                 p_env->write_size, p_env->read_buffers,
2953                 p_env->write_buffers, p_env->devno[READ],
2954                 p_env->devno[WRITE]);
2955         printk(KERN_INFO "%s:host_name:%.8s, adapter_name "
2956                 ":%.8s api_type: %.8s\n",
2957                 dev->name, p_env->host_name,
2958                 p_env->adapter_name , p_env->api_type);
2959         return 0;
2960 out:
2961         ccw_device_set_offline(cgdev->cdev[1]);
2962         ccw_device_set_offline(cgdev->cdev[0]);
2963         return -ENODEV;
2964 }
2965
2966 static void
2967 claw_purge_skb_queue(struct sk_buff_head *q)
2968 {
2969         struct sk_buff *skb;
2970
2971         CLAW_DBF_TEXT(4, trace, "purgque");
2972         while ((skb = skb_dequeue(q))) {
2973                 atomic_dec(&skb->users);
2974                 dev_kfree_skb_any(skb);
2975         }
2976 }
2977
2978 /**
2979  * Shutdown an interface.
2980  *
2981  * @param cgdev  Device to be shut down.
2982  *
2983  * @returns 0 on success, !0 on failure.
2984  */
2985 static int
2986 claw_shutdown_device(struct ccwgroup_device *cgdev)
2987 {
2988         struct claw_privbk *priv;
2989         struct net_device *ndev;
2990         int     ret;
2991
2992         CLAW_DBF_TEXT_(2, setup, "%s", cgdev->dev.bus_id);
2993         priv = cgdev->dev.driver_data;
2994         if (!priv)
2995                 return -ENODEV;
2996         ndev = priv->channel[READ].ndev;
2997         if (ndev) {
2998                 /* Close the device */
2999                 printk(KERN_INFO
3000                         "%s: shuting down \n",ndev->name);
3001                 if (ndev->flags & IFF_RUNNING)
3002                         ret = claw_release(ndev);
3003                 ndev->flags &=~IFF_RUNNING;
3004                 unregister_netdev(ndev);
3005                 ndev->priv = NULL;  /* cgdev data, not ndev's to free */
3006                 claw_free_netdevice(ndev, 1);
3007                 priv->channel[READ].ndev = NULL;
3008                 priv->channel[WRITE].ndev = NULL;
3009                 priv->p_env->ndev = NULL;
3010         }
3011         ccw_device_set_offline(cgdev->cdev[1]);
3012         ccw_device_set_offline(cgdev->cdev[0]);
3013         return 0;
3014 }
3015
3016 static void
3017 claw_remove_device(struct ccwgroup_device *cgdev)
3018 {
3019         struct claw_privbk *priv;
3020
3021         BUG_ON(!cgdev);
3022         CLAW_DBF_TEXT_(2, setup, "%s", cgdev->dev.bus_id);
3023         priv = cgdev->dev.driver_data;
3024         BUG_ON(!priv);
3025         printk(KERN_INFO "claw: %s() called %s will be removed.\n",
3026                         __func__,cgdev->cdev[0]->dev.bus_id);
3027         if (cgdev->state == CCWGROUP_ONLINE)
3028                 claw_shutdown_device(cgdev);
3029         claw_remove_files(&cgdev->dev);
3030         kfree(priv->p_mtc_envelope);
3031         priv->p_mtc_envelope=NULL;
3032         kfree(priv->p_env);
3033         priv->p_env=NULL;
3034         kfree(priv->channel[0].irb);
3035         priv->channel[0].irb=NULL;
3036         kfree(priv->channel[1].irb);
3037         priv->channel[1].irb=NULL;
3038         kfree(priv);
3039         cgdev->dev.driver_data=NULL;
3040         cgdev->cdev[READ]->dev.driver_data = NULL;
3041         cgdev->cdev[WRITE]->dev.driver_data = NULL;
3042         put_device(&cgdev->dev);
3043
3044         return;
3045 }
3046
3047
3048 /*
3049  * sysfs attributes
3050  */
3051 static ssize_t
3052 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3053 {
3054         struct claw_privbk *priv;
3055         struct claw_env *  p_env;
3056
3057         priv = dev->driver_data;
3058         if (!priv)
3059                 return -ENODEV;
3060         p_env = priv->p_env;
3061         return sprintf(buf, "%s\n",p_env->host_name);
3062 }
3063
3064 static ssize_t
3065 claw_hname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3066 {
3067         struct claw_privbk *priv;
3068         struct claw_env *  p_env;
3069
3070         priv = dev->driver_data;
3071         if (!priv)
3072                 return -ENODEV;
3073         p_env = priv->p_env;
3074         if (count > MAX_NAME_LEN+1)
3075                 return -EINVAL;
3076         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3077         strncpy(p_env->host_name,buf, count);
3078         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3079         p_env->host_name[MAX_NAME_LEN] = 0x00;
3080         CLAW_DBF_TEXT(2, setup, "HstnSet");
3081         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3082
3083         return count;
3084 }
3085
3086 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3087
3088 static ssize_t
3089 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3090 {
3091         struct claw_privbk *priv;
3092         struct claw_env *  p_env;
3093
3094         priv = dev->driver_data;
3095         if (!priv)
3096                 return -ENODEV;
3097         p_env = priv->p_env;
3098         return sprintf(buf, "%s\n", p_env->adapter_name);
3099 }
3100
3101 static ssize_t
3102 claw_adname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3103 {
3104         struct claw_privbk *priv;
3105         struct claw_env *  p_env;
3106
3107         priv = dev->driver_data;
3108         if (!priv)
3109                 return -ENODEV;
3110         p_env = priv->p_env;
3111         if (count > MAX_NAME_LEN+1)
3112                 return -EINVAL;
3113         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3114         strncpy(p_env->adapter_name,buf, count);
3115         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3116         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3117         CLAW_DBF_TEXT(2, setup, "AdnSet");
3118         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3119
3120         return count;
3121 }
3122
3123 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3124
3125 static ssize_t
3126 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3127 {
3128         struct claw_privbk *priv;
3129         struct claw_env *  p_env;
3130
3131         priv = dev->driver_data;
3132         if (!priv)
3133                 return -ENODEV;
3134         p_env = priv->p_env;
3135         return sprintf(buf, "%s\n",
3136                        p_env->api_type);
3137 }
3138
3139 static ssize_t
3140 claw_apname_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3141 {
3142         struct claw_privbk *priv;
3143         struct claw_env *  p_env;
3144
3145         priv = dev->driver_data;
3146         if (!priv)
3147                 return -ENODEV;
3148         p_env = priv->p_env;
3149         if (count > MAX_NAME_LEN+1)
3150                 return -EINVAL;
3151         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3152         strncpy(p_env->api_type,buf, count);
3153         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3154         p_env->api_type[MAX_NAME_LEN] = 0x00;
3155         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3156                 p_env->read_size=DEF_PACK_BUFSIZE;
3157                 p_env->write_size=DEF_PACK_BUFSIZE;
3158                 p_env->packing=PACKING_ASK;
3159                 CLAW_DBF_TEXT(2, setup, "PACKING");
3160         }
3161         else {
3162                 p_env->packing=0;
3163                 p_env->read_size=CLAW_FRAME_SIZE;
3164                 p_env->write_size=CLAW_FRAME_SIZE;
3165                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3166         }
3167         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3168         return count;
3169 }
3170
3171 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3172
3173 static ssize_t
3174 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3175 {
3176         struct claw_privbk *priv;
3177         struct claw_env * p_env;
3178
3179         priv = dev->driver_data;
3180         if (!priv)
3181                 return -ENODEV;
3182         p_env = priv->p_env;
3183         return sprintf(buf, "%d\n", p_env->write_buffers);
3184 }
3185
3186 static ssize_t
3187 claw_wbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3188 {
3189         struct claw_privbk *priv;
3190         struct claw_env *  p_env;
3191         int nnn,max;
3192
3193         priv = dev->driver_data;
3194         if (!priv)
3195                 return -ENODEV;
3196         p_env = priv->p_env;
3197         sscanf(buf, "%i", &nnn);
3198         if (p_env->packing) {
3199                 max = 64;
3200         }
3201         else {
3202                 max = 512;
3203         }
3204         if ((nnn > max ) || (nnn < 2))
3205                 return -EINVAL;
3206         p_env->write_buffers = nnn;
3207         CLAW_DBF_TEXT(2, setup, "Wbufset");
3208         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3209         return count;
3210 }
3211
3212 static DEVICE_ATTR(write_buffer, 0644, claw_wbuff_show, claw_wbuff_write);
3213
3214 static ssize_t
3215 claw_rbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3216 {
3217         struct claw_privbk *priv;
3218         struct claw_env *  p_env;
3219
3220         priv = dev->driver_data;
3221         if (!priv)
3222                 return -ENODEV;
3223         p_env = priv->p_env;
3224         return sprintf(buf, "%d\n", p_env->read_buffers);
3225 }
3226
3227 static ssize_t
3228 claw_rbuff_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
3229 {
3230         struct claw_privbk *priv;
3231         struct claw_env *p_env;
3232         int nnn,max;
3233
3234         priv = dev->driver_data;
3235         if (!priv)
3236                 return -ENODEV;
3237         p_env = priv->p_env;
3238         sscanf(buf, "%i", &nnn);
3239         if (p_env->packing) {
3240                 max = 64;
3241         }
3242         else {
3243                 max = 512;
3244         }
3245         if ((nnn > max ) || (nnn < 2))
3246                 return -EINVAL;
3247         p_env->read_buffers = nnn;
3248         CLAW_DBF_TEXT(2, setup, "Rbufset");
3249         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3250         return count;
3251 }
3252
3253 static DEVICE_ATTR(read_buffer, 0644, claw_rbuff_show, claw_rbuff_write);
3254
3255 static struct attribute *claw_attr[] = {
3256         &dev_attr_read_buffer.attr,
3257         &dev_attr_write_buffer.attr,
3258         &dev_attr_adapter_name.attr,
3259         &dev_attr_api_type.attr,
3260         &dev_attr_host_name.attr,
3261         NULL,
3262 };
3263
3264 static struct attribute_group claw_attr_group = {
3265         .attrs = claw_attr,
3266 };
3267
3268 static int
3269 claw_add_files(struct device *dev)
3270 {
3271         CLAW_DBF_TEXT(2, setup, "add_file");
3272         return sysfs_create_group(&dev->kobj, &claw_attr_group);
3273 }
3274
3275 static void
3276 claw_remove_files(struct device *dev)
3277 {
3278         CLAW_DBF_TEXT(2, setup, "rem_file");
3279         sysfs_remove_group(&dev->kobj, &claw_attr_group);
3280 }
3281
3282 /*--------------------------------------------------------------------*
3283 *    claw_init  and cleanup                                           *
3284 *---------------------------------------------------------------------*/
3285
3286 static void __exit
3287 claw_cleanup(void)
3288 {
3289         unregister_cu3088_discipline(&claw_group_driver);
3290         claw_unregister_debug_facility();
3291         printk(KERN_INFO "claw: Driver unloaded\n");
3292
3293 }
3294
3295 /**
3296  * Initialize module.
3297  * This is called just after the module is loaded.
3298  *
3299  * @return 0 on success, !0 on error.
3300  */
3301 static int __init
3302 claw_init(void)
3303 {
3304         int ret = 0;
3305         printk(KERN_INFO "claw: starting driver\n");
3306
3307         ret = claw_register_debug_facility();
3308         if (ret) {
3309                 printk(KERN_WARNING "claw: %s() debug_register failed %d\n",
3310                         __func__,ret);
3311                 return ret;
3312         }
3313         CLAW_DBF_TEXT(2, setup, "init_mod");
3314         ret = register_cu3088_discipline(&claw_group_driver);
3315         if (ret) {
3316                 CLAW_DBF_TEXT(2, setup, "init_bad");
3317                 claw_unregister_debug_facility();
3318                 printk(KERN_WARNING "claw; %s() cu3088 register failed %d\n",
3319                         __func__,ret);
3320         }
3321         return ret;
3322 }
3323
3324 module_init(claw_init);
3325 module_exit(claw_cleanup);
3326
3327 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3328 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3329                         "Copyright 2000,2008 IBM Corporation\n");
3330 MODULE_LICENSE("GPL");