Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

Linux/drivers/s390/net/claw.c

  1 /*
  2  *    ESCON CLAW network driver
  3  *
  4  *  Linux for zSeries version
  5  *    Copyright IBM Corp. 2002, 2009
  6  *  Author(s) Original code written by:
  7  *              Kazuo Iimura <iimura@jp.ibm.com>
  8  *            Rewritten by
  9  *              Andy Richter <richtera@us.ibm.com>
 10  *              Marc Price <mwprice@us.ibm.com>
 11  *
 12  *    sysfs parms:
 13  *   group x.x.rrrr,x.x.wwww
 14  *   read_buffer nnnnnnn
 15  *   write_buffer nnnnnn
 16  *   host_name  aaaaaaaa
 17  *   adapter_name aaaaaaaa
 18  *   api_type    aaaaaaaa
 19  *
 20  *  eg.
 21  *   group  0.0.0200 0.0.0201
 22  *   read_buffer 25
 23  *   write_buffer 20
 24  *   host_name LINUX390
 25  *   adapter_name RS6K
 26  *   api_type     TCPIP
 27  *
 28  *  where
 29  *
 30  *   The device id is decided by the order entries
 31  *   are added to the group the first is claw0 the second claw1
 32  *   up to CLAW_MAX_DEV
 33  *
 34  *   rrrr     - the first of 2 consecutive device addresses used for the
 35  *              CLAW protocol.
 36  *              The specified address is always used as the input (Read)
 37  *              channel and the next address is used as the output channel.
 38  *
 39  *   wwww     - the second of 2 consecutive device addresses used for
 40  *              the CLAW protocol.
 41  *              The specified address is always used as the output
 42  *              channel and the previous address is used as the input channel.
 43  *
 44  *   read_buffer        -       specifies number of input buffers to allocate.
 45  *   write_buffer       -       specifies number of output buffers to allocate.
 46  *   host_name          -       host name
 47  *   adaptor_name       -       adaptor name
 48  *   api_type           -       API type TCPIP or API will be sent and expected
 49  *                              as ws_name
 50  *
 51  *   Note the following requirements:
 52  *   1)  host_name must match the configured adapter_name on the remote side
 53  *   2)  adaptor_name must match the configured host name on the remote side
 54  *
 55  *  Change History
 56  *    1.00  Initial release shipped
 57  *    1.10  Changes for Buffer allocation
 58  *    1.15  Changed for 2.6 Kernel  No longer compiles on 2.4 or lower
 59  *    1.25  Added Packing support
 60  *    1.5
 61  */
 62 
 63 #define KMSG_COMPONENT "claw"
 64 
 65 #include <asm/ccwdev.h>
 66 #include <asm/ccwgroup.h>
 67 #include <asm/debug.h>
 68 #include <asm/idals.h>
 69 #include <asm/io.h>
 70 #include <linux/bitops.h>
 71 #include <linux/ctype.h>
 72 #include <linux/delay.h>
 73 #include <linux/errno.h>
 74 #include <linux/if_arp.h>
 75 #include <linux/init.h>
 76 #include <linux/interrupt.h>
 77 #include <linux/ip.h>
 78 #include <linux/kernel.h>
 79 #include <linux/module.h>
 80 #include <linux/netdevice.h>
 81 #include <linux/etherdevice.h>
 82 #include <linux/proc_fs.h>
 83 #include <linux/sched.h>
 84 #include <linux/signal.h>
 85 #include <linux/skbuff.h>
 86 #include <linux/slab.h>
 87 #include <linux/string.h>
 88 #include <linux/tcp.h>
 89 #include <linux/timer.h>
 90 #include <linux/types.h>
 91 
 92 #include "claw.h"
 93 
 94 /*
 95    CLAW uses the s390dbf file system  see claw_trace and claw_setup
 96 */
 97 
 98 static char version[] __initdata = "CLAW driver";
 99 static char debug_buffer[255];
100 /**
101  * Debug Facility Stuff
102  */
103 static debug_info_t *claw_dbf_setup;
104 static debug_info_t *claw_dbf_trace;
105 
106 /**
107  *  CLAW Debug Facility functions
108  */
109 static void
110 claw_unregister_debug_facility(void)
111 {
112         if (claw_dbf_setup)
113                 debug_unregister(claw_dbf_setup);
114         if (claw_dbf_trace)
115                 debug_unregister(claw_dbf_trace);
116 }
117 
118 static int
119 claw_register_debug_facility(void)
120 {
121         claw_dbf_setup = debug_register("claw_setup", 2, 1, 8);
122         claw_dbf_trace = debug_register("claw_trace", 2, 2, 8);
123         if (claw_dbf_setup == NULL || claw_dbf_trace == NULL) {
124                 claw_unregister_debug_facility();
125                 return -ENOMEM;
126         }
127         debug_register_view(claw_dbf_setup, &debug_hex_ascii_view);
128         debug_set_level(claw_dbf_setup, 2);
129         debug_register_view(claw_dbf_trace, &debug_hex_ascii_view);
130         debug_set_level(claw_dbf_trace, 2);
131         return 0;
132 }
133 
134 static inline void
135 claw_set_busy(struct net_device *dev)
136 {
137  ((struct claw_privbk *)dev->ml_priv)->tbusy = 1;
138 }
139 
140 static inline void
141 claw_clear_busy(struct net_device *dev)
142 {
143         clear_bit(0, &(((struct claw_privbk *) dev->ml_priv)->tbusy));
144         netif_wake_queue(dev);
145 }
146 
147 static inline int
148 claw_check_busy(struct net_device *dev)
149 {
150         return ((struct claw_privbk *) dev->ml_priv)->tbusy;
151 }
152 
153 static inline void
154 claw_setbit_busy(int nr,struct net_device *dev)
155 {
156         netif_stop_queue(dev);
157         set_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
158 }
159 
160 static inline void
161 claw_clearbit_busy(int nr,struct net_device *dev)
162 {
163         clear_bit(nr, (void *)&(((struct claw_privbk *)dev->ml_priv)->tbusy));
164         netif_wake_queue(dev);
165 }
166 
167 static inline int
168 claw_test_and_setbit_busy(int nr,struct net_device *dev)
169 {
170         netif_stop_queue(dev);
171         return test_and_set_bit(nr,
172                 (void *)&(((struct claw_privbk *) dev->ml_priv)->tbusy));
173 }
174 
175 
176 /* Functions for the DEV methods */
177 
178 static int claw_probe(struct ccwgroup_device *cgdev);
179 static void claw_remove_device(struct ccwgroup_device *cgdev);
180 static void claw_purge_skb_queue(struct sk_buff_head *q);
181 static int claw_new_device(struct ccwgroup_device *cgdev);
182 static int claw_shutdown_device(struct ccwgroup_device *cgdev);
183 static int claw_tx(struct sk_buff *skb, struct net_device *dev);
184 static int claw_change_mtu( struct net_device *dev, int new_mtu);
185 static int claw_open(struct net_device *dev);
186 static void claw_irq_handler(struct ccw_device *cdev,
187         unsigned long intparm, struct irb *irb);
188 static void claw_irq_tasklet ( unsigned long data );
189 static int claw_release(struct net_device *dev);
190 static void claw_write_retry ( struct chbk * p_ch );
191 static void claw_write_next ( struct chbk * p_ch );
192 static void claw_timer ( struct chbk * p_ch );
193 
194 /* Functions */
195 static int add_claw_reads(struct net_device *dev,
196         struct ccwbk* p_first, struct ccwbk* p_last);
197 static void ccw_check_return_code (struct ccw_device *cdev, int return_code);
198 static void ccw_check_unit_check (struct chbk * p_ch, unsigned char sense );
199 static int find_link(struct net_device *dev, char *host_name, char *ws_name );
200 static int claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid);
201 static int init_ccw_bk(struct net_device *dev);
202 static void probe_error( struct ccwgroup_device *cgdev);
203 static struct net_device_stats *claw_stats(struct net_device *dev);
204 static int pages_to_order_of_mag(int num_of_pages);
205 static struct sk_buff *claw_pack_skb(struct claw_privbk *privptr);
206 /* sysfs Functions */
207 static ssize_t claw_hname_show(struct device *dev,
208         struct device_attribute *attr, char *buf);
209 static ssize_t claw_hname_write(struct device *dev,
210         struct device_attribute *attr,
211         const char *buf, size_t count);
212 static ssize_t claw_adname_show(struct device *dev,
213         struct device_attribute *attr, char *buf);
214 static ssize_t claw_adname_write(struct device *dev,
215         struct device_attribute *attr,
216         const char *buf, size_t count);
217 static ssize_t claw_apname_show(struct device *dev,
218         struct device_attribute *attr, char *buf);
219 static ssize_t claw_apname_write(struct device *dev,
220         struct device_attribute *attr,
221         const char *buf, size_t count);
222 static ssize_t claw_wbuff_show(struct device *dev,
223         struct device_attribute *attr, char *buf);
224 static ssize_t claw_wbuff_write(struct device *dev,
225         struct device_attribute *attr,
226         const char *buf, size_t count);
227 static ssize_t claw_rbuff_show(struct device *dev,
228         struct device_attribute *attr, char *buf);
229 static ssize_t claw_rbuff_write(struct device *dev,
230         struct device_attribute *attr,
231         const char *buf, size_t count);
232 
233 /*   Functions for System Validate  */
234 static int claw_process_control( struct net_device *dev, struct ccwbk * p_ccw);
235 static int claw_send_control(struct net_device *dev, __u8 type, __u8 link,
236        __u8 correlator, __u8 rc , char *local_name, char *remote_name);
237 static int claw_snd_conn_req(struct net_device *dev, __u8 link);
238 static int claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl);
239 static int claw_snd_sys_validate_rsp(struct net_device *dev,
240         struct clawctl * p_ctl, __u32 return_code);
241 static int claw_strt_conn_req(struct net_device *dev );
242 static void claw_strt_read(struct net_device *dev, int lock);
243 static void claw_strt_out_IO(struct net_device *dev);
244 static void claw_free_wrt_buf(struct net_device *dev);
245 
246 /* Functions for unpack reads   */
247 static void unpack_read(struct net_device *dev);
248 
249 static int claw_pm_prepare(struct ccwgroup_device *gdev)
250 {
251         return -EPERM;
252 }
253 
254 /* the root device for claw group devices */
255 static struct device *claw_root_dev;
256 
257 /* ccwgroup table  */
258 
259 static struct ccwgroup_driver claw_group_driver = {
260         .driver = {
261                 .owner  = THIS_MODULE,
262                 .name   = "claw",
263         },
264         .setup       = claw_probe,
265         .remove      = claw_remove_device,
266         .set_online  = claw_new_device,
267         .set_offline = claw_shutdown_device,
268         .prepare     = claw_pm_prepare,
269 };
270 
271 static struct ccw_device_id claw_ids[] = {
272         {CCW_DEVICE(0x3088, 0x61), .driver_info = claw_channel_type_claw},
273         {},
274 };
275 MODULE_DEVICE_TABLE(ccw, claw_ids);
276 
277 static struct ccw_driver claw_ccw_driver = {
278         .driver = {
279                 .owner  = THIS_MODULE,
280                 .name   = "claw",
281         },
282         .ids    = claw_ids,
283         .probe  = ccwgroup_probe_ccwdev,
284         .remove = ccwgroup_remove_ccwdev,
285         .int_class = IRQIO_CLW,
286 };
287 
288 static ssize_t claw_driver_group_store(struct device_driver *ddrv,
289                                        const char *buf, size_t count)
290 {
291         int err;
292         err = ccwgroup_create_dev(claw_root_dev, &claw_group_driver, 2, buf);
293         return err ? err : count;
294 }
295 static DRIVER_ATTR(group, 0200, NULL, claw_driver_group_store);
296 
297 static struct attribute *claw_drv_attrs[] = {
298         &driver_attr_group.attr,
299         NULL,
300 };
301 static struct attribute_group claw_drv_attr_group = {
302         .attrs = claw_drv_attrs,
303 };
304 static const struct attribute_group *claw_drv_attr_groups[] = {
305         &claw_drv_attr_group,
306         NULL,
307 };
308 
309 /*
310 *       Key functions
311 */
312 
313 /*-------------------------------------------------------------------*
314  *   claw_tx                                                         *
315  *-------------------------------------------------------------------*/
316 
317 static int
318 claw_tx(struct sk_buff *skb, struct net_device *dev)
319 {
320         int             rc;
321         struct claw_privbk *privptr = dev->ml_priv;
322         unsigned long saveflags;
323         struct chbk *p_ch;
324 
325         CLAW_DBF_TEXT(4, trace, "claw_tx");
326         p_ch = &privptr->channel[WRITE_CHANNEL];
327         spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
328         rc=claw_hw_tx( skb, dev, 1 );
329         spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
330         CLAW_DBF_TEXT_(4, trace, "clawtx%d", rc);
331         if (rc)
332                 rc = NETDEV_TX_BUSY;
333         else
334                 rc = NETDEV_TX_OK;
335         return rc;
336 }   /*  end of claw_tx */
337 
338 /*------------------------------------------------------------------*
339  *  pack the collect queue into an skb and return it                *
340  *   If not packing just return the top skb from the queue          *
341  *------------------------------------------------------------------*/
342 
343 static struct sk_buff *
344 claw_pack_skb(struct claw_privbk *privptr)
345 {
346         struct sk_buff *new_skb,*held_skb;
347         struct chbk *p_ch = &privptr->channel[WRITE_CHANNEL];
348         struct claw_env  *p_env = privptr->p_env;
349         int     pkt_cnt,pk_ind,so_far;
350 
351         new_skb = NULL;         /* assume no dice */
352         pkt_cnt = 0;
353         CLAW_DBF_TEXT(4, trace, "PackSKBe");
354         if (!skb_queue_empty(&p_ch->collect_queue)) {
355         /* some data */
356                 held_skb = skb_dequeue(&p_ch->collect_queue);
357                 if (held_skb)
358                         dev_kfree_skb_any(held_skb);
359                 else
360                         return NULL;
361                 if (p_env->packing != DO_PACKED)
362                         return held_skb;
363                 /* get a new SKB we will pack at least one */
364                 new_skb = dev_alloc_skb(p_env->write_size);
365                 if (new_skb == NULL) {
366                         atomic_inc(&held_skb->users);
367                         skb_queue_head(&p_ch->collect_queue,held_skb);
368                         return NULL;
369                 }
370                 /* we have packed packet and a place to put it  */
371                 pk_ind = 1;
372                 so_far = 0;
373                 new_skb->cb[1] = 'P'; /* every skb on queue has pack header */
374                 while ((pk_ind) && (held_skb != NULL)) {
375                         if (held_skb->len+so_far <= p_env->write_size-8) {
376                                 memcpy(skb_put(new_skb,held_skb->len),
377                                         held_skb->data,held_skb->len);
378                                 privptr->stats.tx_packets++;
379                                 so_far += held_skb->len;
380                                 pkt_cnt++;
381                                 dev_kfree_skb_any(held_skb);
382                                 held_skb = skb_dequeue(&p_ch->collect_queue);
383                                 if (held_skb)
384                                         atomic_dec(&held_skb->users);
385                         } else {
386                                 pk_ind = 0;
387                                 atomic_inc(&held_skb->users);
388                                 skb_queue_head(&p_ch->collect_queue,held_skb);
389                         }
390                 }
391         }
392         CLAW_DBF_TEXT(4, trace, "PackSKBx");
393         return new_skb;
394 }
395 
396 /*-------------------------------------------------------------------*
397  *   claw_change_mtu                                                 *
398  *                                                                   *
399  *-------------------------------------------------------------------*/
400 
401 static int
402 claw_change_mtu(struct net_device *dev, int new_mtu)
403 {
404         struct claw_privbk *privptr = dev->ml_priv;
405         int buff_size;
406         CLAW_DBF_TEXT(4, trace, "setmtu");
407         buff_size = privptr->p_env->write_size;
408         if ((new_mtu < 60) || (new_mtu > buff_size)) {
409                 return -EINVAL;
410         }
411         dev->mtu = new_mtu;
412         return 0;
413 }  /*   end of claw_change_mtu */
414 
415 
416 /*-------------------------------------------------------------------*
417  *   claw_open                                                       *
418  *                                                                   *
419  *-------------------------------------------------------------------*/
420 static int
421 claw_open(struct net_device *dev)
422 {
423 
424         int     rc;
425         int     i;
426         unsigned long       saveflags=0;
427         unsigned long       parm;
428         struct claw_privbk  *privptr;
429         DECLARE_WAITQUEUE(wait, current);
430         struct timer_list  timer;
431         struct ccwbk *p_buf;
432 
433         CLAW_DBF_TEXT(4, trace, "open");
434         privptr = (struct claw_privbk *)dev->ml_priv;
435         /*   allocate and initialize CCW blocks */
436         if (privptr->buffs_alloc == 0) {
437                 rc=init_ccw_bk(dev);
438                 if (rc) {
439                         CLAW_DBF_TEXT(2, trace, "openmem");
440                         return -ENOMEM;
441                 }
442         }
443         privptr->system_validate_comp=0;
444         privptr->release_pend=0;
445         if(strncmp(privptr->p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
446                 privptr->p_env->read_size=DEF_PACK_BUFSIZE;
447                 privptr->p_env->write_size=DEF_PACK_BUFSIZE;
448                 privptr->p_env->packing=PACKING_ASK;
449         } else {
450                 privptr->p_env->packing=0;
451                 privptr->p_env->read_size=CLAW_FRAME_SIZE;
452                 privptr->p_env->write_size=CLAW_FRAME_SIZE;
453         }
454         claw_set_busy(dev);
455         tasklet_init(&privptr->channel[READ_CHANNEL].tasklet, claw_irq_tasklet,
456                 (unsigned long) &privptr->channel[READ_CHANNEL]);
457         for ( i = 0; i < 2;  i++) {
458                 CLAW_DBF_TEXT_(2, trace, "opn_ch%d", i);
459                 init_waitqueue_head(&privptr->channel[i].wait);
460                 /* skb_queue_head_init(&p_ch->io_queue); */
461                 if (i == WRITE_CHANNEL)
462                         skb_queue_head_init(
463                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
464                 privptr->channel[i].flag_a = 0;
465                 privptr->channel[i].IO_active = 0;
466                 privptr->channel[i].flag  &= ~CLAW_TIMER;
467                 init_timer(&timer);
468                 timer.function = (void *)claw_timer;
469                 timer.data = (unsigned long)(&privptr->channel[i]);
470                 timer.expires = jiffies + 15*HZ;
471                 add_timer(&timer);
472                 spin_lock_irqsave(get_ccwdev_lock(
473                         privptr->channel[i].cdev), saveflags);
474                 parm = (unsigned long) &privptr->channel[i];
475                 privptr->channel[i].claw_state = CLAW_START_HALT_IO;
476                 rc = 0;
477                 add_wait_queue(&privptr->channel[i].wait, &wait);
478                 rc = ccw_device_halt(
479                         (struct ccw_device *)privptr->channel[i].cdev,parm);
480                 set_current_state(TASK_INTERRUPTIBLE);
481                 spin_unlock_irqrestore(
482                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
483                 schedule();
484                 set_current_state(TASK_RUNNING);
485                 remove_wait_queue(&privptr->channel[i].wait, &wait);
486                 if(rc != 0)
487                         ccw_check_return_code(privptr->channel[i].cdev, rc);
488                 if((privptr->channel[i].flag & CLAW_TIMER) == 0x00)
489                         del_timer(&timer);
490         }
491         if ((((privptr->channel[READ_CHANNEL].last_dstat |
492                 privptr->channel[WRITE_CHANNEL].last_dstat) &
493            ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) ||
494            (((privptr->channel[READ_CHANNEL].flag |
495                 privptr->channel[WRITE_CHANNEL].flag) & CLAW_TIMER) != 0x00)) {
496                 dev_info(&privptr->channel[READ_CHANNEL].cdev->dev,
497                         "%s: remote side is not ready\n", dev->name);
498                 CLAW_DBF_TEXT(2, trace, "notrdy");
499 
500                 for ( i = 0; i < 2;  i++) {
501                         spin_lock_irqsave(
502                                 get_ccwdev_lock(privptr->channel[i].cdev),
503                                 saveflags);
504                         parm = (unsigned long) &privptr->channel[i];
505                         privptr->channel[i].claw_state = CLAW_STOP;
506                         rc = ccw_device_halt(
507                                 (struct ccw_device *)&privptr->channel[i].cdev,
508                                 parm);
509                         spin_unlock_irqrestore(
510                                 get_ccwdev_lock(privptr->channel[i].cdev),
511                                 saveflags);
512                         if (rc != 0) {
513                                 ccw_check_return_code(
514                                         privptr->channel[i].cdev, rc);
515                         }
516                 }
517                 free_pages((unsigned long)privptr->p_buff_ccw,
518                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
519                 if (privptr->p_env->read_size < PAGE_SIZE) {
520                         free_pages((unsigned long)privptr->p_buff_read,
521                                (int)pages_to_order_of_mag(
522                                         privptr->p_buff_read_num));
523                 }
524                 else {
525                         p_buf=privptr->p_read_active_first;
526                         while (p_buf!=NULL) {
527                                 free_pages((unsigned long)p_buf->p_buffer,
528                                       (int)pages_to_order_of_mag(
529                                         privptr->p_buff_pages_perread ));
530                                 p_buf=p_buf->next;
531                         }
532                 }
533                 if (privptr->p_env->write_size < PAGE_SIZE ) {
534                         free_pages((unsigned long)privptr->p_buff_write,
535                              (int)pages_to_order_of_mag(
536                                 privptr->p_buff_write_num));
537                 }
538                 else {
539                         p_buf=privptr->p_write_active_first;
540                         while (p_buf!=NULL) {
541                                 free_pages((unsigned long)p_buf->p_buffer,
542                                      (int)pages_to_order_of_mag(
543                                         privptr->p_buff_pages_perwrite ));
544                                 p_buf=p_buf->next;
545                         }
546                 }
547                 privptr->buffs_alloc = 0;
548                 privptr->channel[READ_CHANNEL].flag = 0x00;
549                 privptr->channel[WRITE_CHANNEL].flag = 0x00;
550                 privptr->p_buff_ccw=NULL;
551                 privptr->p_buff_read=NULL;
552                 privptr->p_buff_write=NULL;
553                 claw_clear_busy(dev);
554                 CLAW_DBF_TEXT(2, trace, "open EIO");
555                 return -EIO;
556         }
557 
558         /*   Send SystemValidate command */
559 
560         claw_clear_busy(dev);
561         CLAW_DBF_TEXT(4, trace, "openok");
562         return 0;
563 }    /*     end of claw_open    */
564 
565 /*-------------------------------------------------------------------*
566 *                                                                    *
567 *       claw_irq_handler                                             *
568 *                                                                    *
569 *--------------------------------------------------------------------*/
570 static void
571 claw_irq_handler(struct ccw_device *cdev,
572         unsigned long intparm, struct irb *irb)
573 {
574         struct chbk *p_ch = NULL;
575         struct claw_privbk *privptr = NULL;
576         struct net_device *dev = NULL;
577         struct claw_env  *p_env;
578         struct chbk *p_ch_r=NULL;
579 
580         CLAW_DBF_TEXT(4, trace, "clawirq");
581         /* Bypass all 'unsolicited interrupts' */
582         privptr = dev_get_drvdata(&cdev->dev);
583         if (!privptr) {
584                 dev_warn(&cdev->dev, "An uninitialized CLAW device received an"
585                         " IRQ, c-%02x d-%02x\n",
586                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat);
587                 CLAW_DBF_TEXT(2, trace, "badirq");
588                 return;
589         }
590 
591         /* Try to extract channel from driver data. */
592         if (privptr->channel[READ_CHANNEL].cdev == cdev)
593                 p_ch = &privptr->channel[READ_CHANNEL];
594         else if (privptr->channel[WRITE_CHANNEL].cdev == cdev)
595                 p_ch = &privptr->channel[WRITE_CHANNEL];
596         else {
597                 dev_warn(&cdev->dev, "The device is not a CLAW device\n");
598                 CLAW_DBF_TEXT(2, trace, "badchan");
599                 return;
600         }
601         CLAW_DBF_TEXT_(4, trace, "IRQCH=%d", p_ch->flag);
602 
603         dev = (struct net_device *) (p_ch->ndev);
604         p_env=privptr->p_env;
605 
606         /* Copy interruption response block. */
607         memcpy(p_ch->irb, irb, sizeof(struct irb));
608 
609         /* Check for good subchannel return code, otherwise info message */
610         if (irb->scsw.cmd.cstat && !(irb->scsw.cmd.cstat & SCHN_STAT_PCI)) {
611                 dev_info(&cdev->dev,
612                         "%s: subchannel check for device: %04x -"
613                         " Sch Stat %02x  Dev Stat %02x CPA - %04x\n",
614                         dev->name, p_ch->devno,
615                         irb->scsw.cmd.cstat, irb->scsw.cmd.dstat,
616                         irb->scsw.cmd.cpa);
617                 CLAW_DBF_TEXT(2, trace, "chanchk");
618                 /* return; */
619         }
620 
621         /* Check the reason-code of a unit check */
622         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
623                 ccw_check_unit_check(p_ch, irb->ecw[0]);
624 
625         /* State machine to bring the connection up, down and to restart */
626         p_ch->last_dstat = irb->scsw.cmd.dstat;
627 
628         switch (p_ch->claw_state) {
629         case CLAW_STOP:/* HALT_IO by claw_release (halt sequence) */
630                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
631                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
632                 (p_ch->irb->scsw.cmd.stctl ==
633                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))))
634                         return;
635                 wake_up(&p_ch->wait);   /* wake up claw_release */
636                 CLAW_DBF_TEXT(4, trace, "stop");
637                 return;
638         case CLAW_START_HALT_IO: /* HALT_IO issued by claw_open  */
639                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
640                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
641                 (p_ch->irb->scsw.cmd.stctl ==
642                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
643                         CLAW_DBF_TEXT(4, trace, "haltio");
644                         return;
645                 }
646                 if (p_ch->flag == CLAW_READ) {
647                         p_ch->claw_state = CLAW_START_READ;
648                         wake_up(&p_ch->wait); /* wake claw_open (READ)*/
649                 } else if (p_ch->flag == CLAW_WRITE) {
650                         p_ch->claw_state = CLAW_START_WRITE;
651                         /*      send SYSTEM_VALIDATE                    */
652                         claw_strt_read(dev, LOCK_NO);
653                         claw_send_control(dev,
654                                 SYSTEM_VALIDATE_REQUEST,
655                                 0, 0, 0,
656                                 p_env->host_name,
657                                 p_env->adapter_name);
658                 } else {
659                         dev_warn(&cdev->dev, "The CLAW device received"
660                                 " an unexpected IRQ, "
661                                 "c-%02x d-%02x\n",
662                                 irb->scsw.cmd.cstat,
663                                 irb->scsw.cmd.dstat);
664                         return;
665                         }
666                 CLAW_DBF_TEXT(4, trace, "haltio");
667                 return;
668         case CLAW_START_READ:
669                 CLAW_DBF_TEXT(4, trace, "ReadIRQ");
670                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
671                         clear_bit(0, (void *)&p_ch->IO_active);
672                         if ((p_ch->irb->ecw[0] & 0x41) == 0x41 ||
673                             (p_ch->irb->ecw[0] & 0x40) == 0x40 ||
674                             (p_ch->irb->ecw[0])        == 0) {
675                                 privptr->stats.rx_errors++;
676                                 dev_info(&cdev->dev,
677                                         "%s: Restart is required after remote "
678                                         "side recovers \n",
679                                         dev->name);
680                         }
681                         CLAW_DBF_TEXT(4, trace, "notrdy");
682                         return;
683                 }
684                 if ((p_ch->irb->scsw.cmd.cstat & SCHN_STAT_PCI) &&
685                         (p_ch->irb->scsw.cmd.dstat == 0)) {
686                         if (test_and_set_bit(CLAW_BH_ACTIVE,
687                                 (void *)&p_ch->flag_a) == 0)
688                                 tasklet_schedule(&p_ch->tasklet);
689                         else
690                                 CLAW_DBF_TEXT(4, trace, "PCINoBH");
691                         CLAW_DBF_TEXT(4, trace, "PCI_read");
692                         return;
693                 }
694                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
695                  (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
696                  (p_ch->irb->scsw.cmd.stctl ==
697                  (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
698                         CLAW_DBF_TEXT(4, trace, "SPend_rd");
699                         return;
700                 }
701                 clear_bit(0, (void *)&p_ch->IO_active);
702                 claw_clearbit_busy(TB_RETRY, dev);
703                 if (test_and_set_bit(CLAW_BH_ACTIVE,
704                         (void *)&p_ch->flag_a) == 0)
705                         tasklet_schedule(&p_ch->tasklet);
706                 else
707                         CLAW_DBF_TEXT(4, trace, "RdBHAct");
708                 CLAW_DBF_TEXT(4, trace, "RdIRQXit");
709                 return;
710         case CLAW_START_WRITE:
711                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
712                         dev_info(&cdev->dev,
713                                 "%s: Unit Check Occurred in "
714                                 "write channel\n", dev->name);
715                         clear_bit(0, (void *)&p_ch->IO_active);
716                         if (p_ch->irb->ecw[0] & 0x80) {
717                                 dev_info(&cdev->dev,
718                                         "%s: Resetting Event "
719                                         "occurred:\n", dev->name);
720                                 init_timer(&p_ch->timer);
721                                 p_ch->timer.function =
722                                         (void *)claw_write_retry;
723                                 p_ch->timer.data = (unsigned long)p_ch;
724                                 p_ch->timer.expires = jiffies + 10*HZ;
725                                 add_timer(&p_ch->timer);
726                                 dev_info(&cdev->dev,
727                                         "%s: write connection "
728                                         "restarting\n", dev->name);
729                         }
730                         CLAW_DBF_TEXT(4, trace, "rstrtwrt");
731                         return;
732                 }
733                 if (p_ch->irb->scsw.cmd.dstat & DEV_STAT_UNIT_EXCEP) {
734                         clear_bit(0, (void *)&p_ch->IO_active);
735                         dev_info(&cdev->dev,
736                                 "%s: Unit Exception "
737                                 "occurred in write channel\n",
738                                 dev->name);
739                 }
740                 if (!((p_ch->irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
741                 (p_ch->irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
742                 (p_ch->irb->scsw.cmd.stctl ==
743                 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))) {
744                         CLAW_DBF_TEXT(4, trace, "writeUE");
745                         return;
746                 }
747                 clear_bit(0, (void *)&p_ch->IO_active);
748                 if (claw_test_and_setbit_busy(TB_TX, dev) == 0) {
749                         claw_write_next(p_ch);
750                         claw_clearbit_busy(TB_TX, dev);
751                         claw_clear_busy(dev);
752                 }
753                 p_ch_r = (struct chbk *)&privptr->channel[READ_CHANNEL];
754                 if (test_and_set_bit(CLAW_BH_ACTIVE,
755                         (void *)&p_ch_r->flag_a) == 0)
756                         tasklet_schedule(&p_ch_r->tasklet);
757                 CLAW_DBF_TEXT(4, trace, "StWtExit");
758                 return;
759         default:
760                 dev_warn(&cdev->dev,
761                         "The CLAW device for %s received an unexpected IRQ\n",
762                          dev->name);
763                 CLAW_DBF_TEXT(2, trace, "badIRQ");
764                 return;
765         }
766 
767 }       /*   end of claw_irq_handler    */
768 
769 
770 /*-------------------------------------------------------------------*
771 *       claw_irq_tasklet                                             *
772 *                                                                    *
773 *--------------------------------------------------------------------*/
774 static void
775 claw_irq_tasklet ( unsigned long data )
776 {
777         struct chbk * p_ch;
778         struct net_device  *dev;
779 
780         p_ch = (struct chbk *) data;
781         dev = (struct net_device *)p_ch->ndev;
782         CLAW_DBF_TEXT(4, trace, "IRQtask");
783         unpack_read(dev);
784         clear_bit(CLAW_BH_ACTIVE, (void *)&p_ch->flag_a);
785         CLAW_DBF_TEXT(4, trace, "TskletXt");
786         return;
787 }       /*    end of claw_irq_bh    */
788 
789 /*-------------------------------------------------------------------*
790 *       claw_release                                                 *
791 *                                                                    *
792 *--------------------------------------------------------------------*/
793 static int
794 claw_release(struct net_device *dev)
795 {
796         int                rc;
797         int                i;
798         unsigned long      saveflags;
799         unsigned long      parm;
800         struct claw_privbk *privptr;
801         DECLARE_WAITQUEUE(wait, current);
802         struct ccwbk*             p_this_ccw;
803         struct ccwbk*             p_buf;
804 
805         if (!dev)
806                 return 0;
807         privptr = (struct claw_privbk *)dev->ml_priv;
808         if (!privptr)
809                 return 0;
810         CLAW_DBF_TEXT(4, trace, "release");
811         privptr->release_pend=1;
812         claw_setbit_busy(TB_STOP,dev);
813         for ( i = 1; i >=0 ;  i--) {
814                 spin_lock_irqsave(
815                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
816              /*   del_timer(&privptr->channel[READ_CHANNEL].timer);  */
817                 privptr->channel[i].claw_state = CLAW_STOP;
818                 privptr->channel[i].IO_active = 0;
819                 parm = (unsigned long) &privptr->channel[i];
820                 if (i == WRITE_CHANNEL)
821                         claw_purge_skb_queue(
822                                 &privptr->channel[WRITE_CHANNEL].collect_queue);
823                 rc = ccw_device_halt (privptr->channel[i].cdev, parm);
824                 if (privptr->system_validate_comp==0x00)  /* never opened? */
825                    init_waitqueue_head(&privptr->channel[i].wait);
826                 add_wait_queue(&privptr->channel[i].wait, &wait);
827                 set_current_state(TASK_INTERRUPTIBLE);
828                 spin_unlock_irqrestore(
829                         get_ccwdev_lock(privptr->channel[i].cdev), saveflags);
830                 schedule();
831                 set_current_state(TASK_RUNNING);
832                 remove_wait_queue(&privptr->channel[i].wait, &wait);
833                 if (rc != 0) {
834                         ccw_check_return_code(privptr->channel[i].cdev, rc);
835                 }
836         }
837         if (privptr->pk_skb != NULL) {
838                 dev_kfree_skb_any(privptr->pk_skb);
839                 privptr->pk_skb = NULL;
840         }
841         if(privptr->buffs_alloc != 1) {
842                 CLAW_DBF_TEXT(4, trace, "none2fre");
843                 return 0;
844         }
845         CLAW_DBF_TEXT(4, trace, "freebufs");
846         if (privptr->p_buff_ccw != NULL) {
847                 free_pages((unsigned long)privptr->p_buff_ccw,
848                         (int)pages_to_order_of_mag(privptr->p_buff_ccw_num));
849         }
850         CLAW_DBF_TEXT(4, trace, "freeread");
851         if (privptr->p_env->read_size < PAGE_SIZE) {
852             if (privptr->p_buff_read != NULL) {
853                 free_pages((unsigned long)privptr->p_buff_read,
854                       (int)pages_to_order_of_mag(privptr->p_buff_read_num));
855                 }
856         }
857         else {
858                 p_buf=privptr->p_read_active_first;
859                 while (p_buf!=NULL) {
860                         free_pages((unsigned long)p_buf->p_buffer,
861                              (int)pages_to_order_of_mag(
862                                 privptr->p_buff_pages_perread ));
863                         p_buf=p_buf->next;
864                 }
865         }
866          CLAW_DBF_TEXT(4, trace, "freewrit");
867         if (privptr->p_env->write_size < PAGE_SIZE ) {
868                 free_pages((unsigned long)privptr->p_buff_write,
869                       (int)pages_to_order_of_mag(privptr->p_buff_write_num));
870         }
871         else {
872                 p_buf=privptr->p_write_active_first;
873                 while (p_buf!=NULL) {
874                         free_pages((unsigned long)p_buf->p_buffer,
875                               (int)pages_to_order_of_mag(
876                               privptr->p_buff_pages_perwrite ));
877                         p_buf=p_buf->next;
878                 }
879         }
880          CLAW_DBF_TEXT(4, trace, "clearptr");
881         privptr->buffs_alloc = 0;
882         privptr->p_buff_ccw=NULL;
883         privptr->p_buff_read=NULL;
884         privptr->p_buff_write=NULL;
885         privptr->system_validate_comp=0;
886         privptr->release_pend=0;
887         /*      Remove any writes that were pending and reset all reads   */
888         p_this_ccw=privptr->p_read_active_first;
889         while (p_this_ccw!=NULL) {
890                 p_this_ccw->header.length=0xffff;
891                 p_this_ccw->header.opcode=0xff;
892                 p_this_ccw->header.flag=0x00;
893                 p_this_ccw=p_this_ccw->next;
894         }
895 
896         while (privptr->p_write_active_first!=NULL) {
897                 p_this_ccw=privptr->p_write_active_first;
898                 p_this_ccw->header.flag=CLAW_PENDING;
899                 privptr->p_write_active_first=p_this_ccw->next;
900                 p_this_ccw->next=privptr->p_write_free_chain;
901                 privptr->p_write_free_chain=p_this_ccw;
902                 ++privptr->write_free_count;
903         }
904         privptr->p_write_active_last=NULL;
905         privptr->mtc_logical_link = -1;
906         privptr->mtc_skipping = 1;
907         privptr->mtc_offset=0;
908 
909         if (((privptr->channel[READ_CHANNEL].last_dstat |
910                 privptr->channel[WRITE_CHANNEL].last_dstat) &
911                 ~(DEV_STAT_CHN_END | DEV_STAT_DEV_END)) != 0x00) {
912                 dev_warn(&privptr->channel[READ_CHANNEL].cdev->dev,
913                         "Deactivating %s completed with incorrect"
914                         " subchannel status "
915                         "(read %02x, write %02x)\n",
916                 dev->name,
917                 privptr->channel[READ_CHANNEL].last_dstat,
918                 privptr->channel[WRITE_CHANNEL].last_dstat);
919                  CLAW_DBF_TEXT(2, trace, "badclose");
920         }
921         CLAW_DBF_TEXT(4, trace, "rlsexit");
922         return 0;
923 }      /* end of claw_release     */
924 
925 /*-------------------------------------------------------------------*
926 *       claw_write_retry                                             *
927 *                                                                    *
928 *--------------------------------------------------------------------*/
929 
930 static void
931 claw_write_retry ( struct chbk *p_ch )
932 {
933 
934         struct net_device  *dev=p_ch->ndev;
935 
936         CLAW_DBF_TEXT(4, trace, "w_retry");
937         if (p_ch->claw_state == CLAW_STOP) {
938                 return;
939         }
940         claw_strt_out_IO( dev );
941         CLAW_DBF_TEXT(4, trace, "rtry_xit");
942         return;
943 }      /* end of claw_write_retry      */
944 
945 
946 /*-------------------------------------------------------------------*
947 *       claw_write_next                                              *
948 *                                                                    *
949 *--------------------------------------------------------------------*/
950 
951 static void
952 claw_write_next ( struct chbk * p_ch )
953 {
954 
955         struct net_device  *dev;
956         struct claw_privbk *privptr=NULL;
957         struct sk_buff *pk_skb;
958 
959         CLAW_DBF_TEXT(4, trace, "claw_wrt");
960         if (p_ch->claw_state == CLAW_STOP)
961                 return;
962         dev = (struct net_device *) p_ch->ndev;
963         privptr = (struct claw_privbk *) dev->ml_priv;
964         claw_free_wrt_buf( dev );
965         if ((privptr->write_free_count > 0) &&
966             !skb_queue_empty(&p_ch->collect_queue)) {
967                 pk_skb = claw_pack_skb(privptr);
968                 while (pk_skb != NULL) {
969                         claw_hw_tx(pk_skb, dev, 1);
970                         if (privptr->write_free_count > 0) {
971                                 pk_skb = claw_pack_skb(privptr);
972                         } else
973                                 pk_skb = NULL;
974                 }
975         }
976         if (privptr->p_write_active_first!=NULL) {
977                 claw_strt_out_IO(dev);
978         }
979         return;
980 }      /* end of claw_write_next      */
981 
982 /*-------------------------------------------------------------------*
983 *                                                                    *
984 *       claw_timer                                                   *
985 *--------------------------------------------------------------------*/
986 
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;
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->ml_priv;
1046         p_end = privptr->p_end_ccw;
1047 
1048         /* first CCW and last CCW contains a new set of read channel programs
1049         *       to apend the running channel programs
1050         */
1051         if ( p_first==NULL) {
1052                 CLAW_DBF_TEXT(4, trace, "addexit");
1053                 return 0;
1054         }
1055 
1056         /* set up ending CCW sequence for this segment */
1057         if (p_end->read1) {
1058                 p_end->read1=0x00;    /*  second ending CCW is now active */
1059                 /*      reset ending CCWs and setup TIC CCWs              */
1060                 p_end->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1061                 p_end->read2_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1062                 p_last->r_TIC_1.cda =(__u32)__pa(&p_end->read2_nop1);
1063                 p_last->r_TIC_2.cda =(__u32)__pa(&p_end->read2_nop1);
1064                 p_end->read2_nop2.cda=0;
1065                 p_end->read2_nop2.count=1;
1066         }
1067         else {
1068                 p_end->read1=0x01;  /* first ending CCW is now active */
1069                 /*      reset ending CCWs and setup TIC CCWs          */
1070                 p_end->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1071                 p_end->read1_nop2.flags  = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1072                 p_last->r_TIC_1.cda = (__u32)__pa(&p_end->read1_nop1);
1073                 p_last->r_TIC_2.cda = (__u32)__pa(&p_end->read1_nop1);
1074                 p_end->read1_nop2.cda=0;
1075                 p_end->read1_nop2.count=1;
1076         }
1077 
1078         if ( privptr-> p_read_active_first ==NULL ) {
1079                 privptr->p_read_active_first = p_first;  /*  set new first */
1080                 privptr->p_read_active_last  = p_last;   /*  set new last  */
1081         }
1082         else {
1083 
1084                 /* set up TIC ccw  */
1085                 temp_ccw.cda= (__u32)__pa(&p_first->read);
1086                 temp_ccw.count=0;
1087                 temp_ccw.flags=0;
1088                 temp_ccw.cmd_code = CCW_CLAW_CMD_TIC;
1089 
1090 
1091                 if (p_end->read1) {
1092 
1093                /* first set of CCW's is chained to the new read              */
1094                /* chain, so the second set is chained to the active chain.   */
1095                /* Therefore modify the second set to point to the new        */
1096                /* read chain set up TIC CCWs                                 */
1097                /* make sure we update the CCW so channel doesn't fetch it    */
1098                /* when it's only half done                                   */
1099                         memcpy( &p_end->read2_nop2, &temp_ccw ,
1100                                 sizeof(struct ccw1));
1101                         privptr->p_read_active_last->r_TIC_1.cda=
1102                                 (__u32)__pa(&p_first->read);
1103                         privptr->p_read_active_last->r_TIC_2.cda=
1104                                 (__u32)__pa(&p_first->read);
1105                 }
1106                 else {
1107                         /* make sure we update the CCW so channel doesn't   */
1108                         /* fetch it when it is only half done               */
1109                         memcpy( &p_end->read1_nop2, &temp_ccw ,
1110                                 sizeof(struct ccw1));
1111                         privptr->p_read_active_last->r_TIC_1.cda=
1112                                 (__u32)__pa(&p_first->read);
1113                         privptr->p_read_active_last->r_TIC_2.cda=
1114                                 (__u32)__pa(&p_first->read);
1115                 }
1116                 /*      chain in new set of blocks                         */
1117                 privptr->p_read_active_last->next = p_first;
1118                 privptr->p_read_active_last=p_last;
1119         } /* end of if ( privptr-> p_read_active_first ==NULL)  */
1120         CLAW_DBF_TEXT(4, trace, "addexit");
1121         return 0;
1122 }    /*     end of add_claw_reads   */
1123 
1124 /*-------------------------------------------------------------------*
1125  *   ccw_check_return_code                                           *
1126  *                                                                   *
1127  *-------------------------------------------------------------------*/
1128 
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                         dev_err(&cdev->dev, "The remote channel adapter is not"
1139                                 " available\n");
1140                         break;
1141                 case -EINVAL:
1142                         dev_err(&cdev->dev,
1143                                 "The status of the remote channel adapter"
1144                                 " is not valid\n");
1145                         break;
1146                 default:
1147                         dev_err(&cdev->dev, "The common device layer"
1148                                 " returned error code %d\n",
1149                                   return_code);
1150                 }
1151         }
1152         CLAW_DBF_TEXT(4, trace, "ccwret");
1153 }    /*    end of ccw_check_return_code   */
1154 
1155 /*-------------------------------------------------------------------*
1156 *       ccw_check_unit_check                                         *
1157 *--------------------------------------------------------------------*/
1158 
1159 static void
1160 ccw_check_unit_check(struct chbk * p_ch, unsigned char sense )
1161 {
1162         struct net_device *ndev = p_ch->ndev;
1163         struct device *dev = &p_ch->cdev->dev;
1164 
1165         CLAW_DBF_TEXT(4, trace, "unitchek");
1166         dev_warn(dev, "The communication peer of %s disconnected\n",
1167                 ndev->name);
1168 
1169         if (sense & 0x40) {
1170                 if (sense & 0x01) {
1171                         dev_warn(dev, "The remote channel adapter for"
1172                                 " %s has been reset\n",
1173                                 ndev->name);
1174                 }
1175         } else if (sense & 0x20) {
1176                 if (sense & 0x04) {
1177                         dev_warn(dev, "A data streaming timeout occurred"
1178                                 " for %s\n",
1179                                 ndev->name);
1180                 } else if (sense & 0x10) {
1181                         dev_warn(dev, "The remote channel adapter for %s"
1182                                 " is faulty\n",
1183                                 ndev->name);
1184                 } else {
1185                         dev_warn(dev, "A data transfer parity error occurred"
1186                                 " for %s\n",
1187                                 ndev->name);
1188                 }
1189         } else if (sense & 0x10) {
1190                 dev_warn(dev, "A read data parity error occurred"
1191                         " for %s\n",
1192                         ndev->name);
1193         }
1194 
1195 }   /*    end of ccw_check_unit_check    */
1196 
1197 /*-------------------------------------------------------------------*
1198 *               find_link                                            *
1199 *--------------------------------------------------------------------*/
1200 static int
1201 find_link(struct net_device *dev, char *host_name, char *ws_name )
1202 {
1203         struct claw_privbk *privptr;
1204         struct claw_env *p_env;
1205         int    rc=0;
1206 
1207         CLAW_DBF_TEXT(2, setup, "findlink");
1208         privptr = dev->ml_priv;
1209         p_env=privptr->p_env;
1210         switch (p_env->packing)
1211         {
1212                 case  PACKING_ASK:
1213                         if ((memcmp(WS_APPL_NAME_PACKED, host_name, 8)!=0) ||
1214                             (memcmp(WS_APPL_NAME_PACKED, ws_name, 8)!=0 ))
1215                              rc = EINVAL;
1216                         break;
1217                 case  DO_PACKED:
1218                 case  PACK_SEND:
1219                         if ((memcmp(WS_APPL_NAME_IP_NAME, host_name, 8)!=0) ||
1220                             (memcmp(WS_APPL_NAME_IP_NAME, ws_name, 8)!=0 ))
1221                                 rc = EINVAL;
1222                         break;
1223                 default:
1224                         if ((memcmp(HOST_APPL_NAME, host_name, 8)!=0) ||
1225                             (memcmp(p_env->api_type , ws_name, 8)!=0))
1226                                 rc = EINVAL;
1227                         break;
1228         }
1229 
1230         return rc;
1231 }    /*    end of find_link    */
1232 
1233 /*-------------------------------------------------------------------*
1234  *   claw_hw_tx                                                      *
1235  *                                                                   *
1236  *                                                                   *
1237  *-------------------------------------------------------------------*/
1238 
1239 static int
1240 claw_hw_tx(struct sk_buff *skb, struct net_device *dev, long linkid)
1241 {
1242         int                             rc=0;
1243         struct claw_privbk              *privptr;
1244         struct ccwbk           *p_this_ccw;
1245         struct ccwbk           *p_first_ccw;
1246         struct ccwbk           *p_last_ccw;
1247         __u32                           numBuffers;
1248         signed long                     len_of_data;
1249         unsigned long                   bytesInThisBuffer;
1250         unsigned char                   *pDataAddress;
1251         struct endccw                   *pEnd;
1252         struct ccw1                     tempCCW;
1253         struct claw_env                 *p_env;
1254         struct clawph                   *pk_head;
1255         struct chbk                     *ch;
1256 
1257         CLAW_DBF_TEXT(4, trace, "hw_tx");
1258         privptr = (struct claw_privbk *)(dev->ml_priv);
1259         p_env =privptr->p_env;
1260         claw_free_wrt_buf(dev); /* Clean up free chain if posible */
1261         /*  scan the write queue to free any completed write packets   */
1262         p_first_ccw=NULL;
1263         p_last_ccw=NULL;
1264         if ((p_env->packing >= PACK_SEND) &&
1265             (skb->cb[1] != 'P')) {
1266                 skb_push(skb,sizeof(struct clawph));
1267                 pk_head=(struct clawph *)skb->data;
1268                 pk_head->len=skb->len-sizeof(struct clawph);
1269                 if (pk_head->len%4)  {
1270                         pk_head->len+= 4-(pk_head->len%4);
1271                         skb_pad(skb,4-(pk_head->len%4));
1272                         skb_put(skb,4-(pk_head->len%4));
1273                 }
1274                 if (p_env->packing == DO_PACKED)
1275                         pk_head->link_num = linkid;
1276                 else
1277                         pk_head->link_num = 0;
1278                 pk_head->flag = 0x00;
1279                 skb_pad(skb,4);
1280                 skb->cb[1] = 'P';
1281         }
1282         if (linkid == 0) {
1283                 if (claw_check_busy(dev)) {
1284                         if (privptr->write_free_count!=0) {
1285                                 claw_clear_busy(dev);
1286                         }
1287                         else {
1288                                 claw_strt_out_IO(dev );
1289                                 claw_free_wrt_buf( dev );
1290                                 if (privptr->write_free_count==0) {
1291                                         ch = &privptr->channel[WRITE_CHANNEL];
1292                                         atomic_inc(&skb->users);
1293                                         skb_queue_tail(&ch->collect_queue, skb);
1294                                         goto Done;
1295                                 }
1296                                 else {
1297                                         claw_clear_busy(dev);
1298                                 }
1299                         }
1300                 }
1301                 /*  tx lock  */
1302                 if (claw_test_and_setbit_busy(TB_TX,dev)) { /* set to busy */
1303                         ch = &privptr->channel[WRITE_CHANNEL];
1304                         atomic_inc(&skb->users);
1305                         skb_queue_tail(&ch->collect_queue, skb);
1306                         claw_strt_out_IO(dev );
1307                         rc=-EBUSY;
1308                         goto Done2;
1309                 }
1310         }
1311         /*      See how many write buffers are required to hold this data */
1312         numBuffers = DIV_ROUND_UP(skb->len, privptr->p_env->write_size);
1313 
1314         /*      If that number of buffers isn't available, give up for now */
1315         if (privptr->write_free_count < numBuffers ||
1316             privptr->p_write_free_chain == NULL ) {
1317 
1318                 claw_setbit_busy(TB_NOBUFFER,dev);
1319                 ch = &privptr->channel[WRITE_CHANNEL];
1320                 atomic_inc(&skb->users);
1321                 skb_queue_tail(&ch->collect_queue, skb);
1322                 CLAW_DBF_TEXT(2, trace, "clawbusy");
1323                 goto Done2;
1324         }
1325         pDataAddress=skb->data;
1326         len_of_data=skb->len;
1327 
1328         while (len_of_data > 0) {
1329                 p_this_ccw=privptr->p_write_free_chain;  /* get a block */
1330                 if (p_this_ccw == NULL) { /* lost the race */
1331                         ch = &privptr->channel[WRITE_CHANNEL];
1332                         atomic_inc(&skb->users);
1333                         skb_queue_tail(&ch->collect_queue, skb);
1334                         goto Done2;
1335                 }
1336                 privptr->p_write_free_chain=p_this_ccw->next;
1337                 p_this_ccw->next=NULL;
1338                 --privptr->write_free_count; /* -1 */
1339                 if (len_of_data >= privptr->p_env->write_size)
1340                         bytesInThisBuffer = privptr->p_env->write_size;
1341                 else
1342                         bytesInThisBuffer = len_of_data;
1343                 memcpy( p_this_ccw->p_buffer,pDataAddress, bytesInThisBuffer);
1344                 len_of_data-=bytesInThisBuffer;
1345                 pDataAddress+=(unsigned long)bytesInThisBuffer;
1346                 /*      setup write CCW         */
1347                 p_this_ccw->write.cmd_code = (linkid * 8) +1;
1348                 if (len_of_data>0) {
1349                         p_this_ccw->write.cmd_code+=MORE_to_COME_FLAG;
1350                 }
1351                 p_this_ccw->write.count=bytesInThisBuffer;
1352                 /*      now add to end of this chain    */
1353                 if (p_first_ccw==NULL)    {
1354                         p_first_ccw=p_this_ccw;
1355                 }
1356                 if (p_last_ccw!=NULL) {
1357                         p_last_ccw->next=p_this_ccw;
1358                         /*      set up TIC ccws         */
1359                         p_last_ccw->w_TIC_1.cda=
1360                                 (__u32)__pa(&p_this_ccw->write);
1361                 }
1362                 p_last_ccw=p_this_ccw;      /* save new last block */
1363         }
1364 
1365         /*      FirstCCW and LastCCW now contain a new set of write channel
1366         *       programs to append to the running channel program
1367         */
1368 
1369         if (p_first_ccw!=NULL) {
1370                 /*      setup ending ccw sequence for this segment           */
1371                 pEnd=privptr->p_end_ccw;
1372                 if (pEnd->write1) {
1373                         pEnd->write1=0x00;   /* second end ccw is now active */
1374                         /*      set up Tic CCWs         */
1375                         p_last_ccw->w_TIC_1.cda=
1376                                 (__u32)__pa(&pEnd->write2_nop1);
1377                         pEnd->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1378                         pEnd->write2_nop2.flags    =
1379                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1380                         pEnd->write2_nop2.cda=0;
1381                         pEnd->write2_nop2.count=1;
1382                 }
1383                 else {  /*  end of if (pEnd->write1)*/
1384                         pEnd->write1=0x01;   /* first end ccw is now active */
1385                         /*      set up Tic CCWs         */
1386                         p_last_ccw->w_TIC_1.cda=
1387                                 (__u32)__pa(&pEnd->write1_nop1);
1388                         pEnd->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1389                         pEnd->write1_nop2.flags    =
1390                                 CCW_FLAG_SLI | CCW_FLAG_SKIP;
1391                         pEnd->write1_nop2.cda=0;
1392                         pEnd->write1_nop2.count=1;
1393                 }  /* end if if (pEnd->write1) */
1394 
1395                 if (privptr->p_write_active_first==NULL ) {
1396                         privptr->p_write_active_first=p_first_ccw;
1397                         privptr->p_write_active_last=p_last_ccw;
1398                 }
1399                 else {
1400                         /*      set up Tic CCWs         */
1401 
1402                         tempCCW.cda=(__u32)__pa(&p_first_ccw->write);
1403                         tempCCW.count=0;
1404                         tempCCW.flags=0;
1405                         tempCCW.cmd_code=CCW_CLAW_CMD_TIC;
1406 
1407                         if (pEnd->write1) {
1408 
1409                  /*
1410                  * first set of ending CCW's is chained to the new write
1411                  * chain, so the second set is chained to the active chain
1412                  * Therefore modify the second set to point the new write chain.
1413                  * make sure we update the CCW atomically
1414                  * so channel does not fetch it when it's only half done
1415                  */
1416                                 memcpy( &pEnd->write2_nop2, &tempCCW ,
1417                                         sizeof(struct ccw1));
1418                                 privptr->p_write_active_last->w_TIC_1.cda=
1419                                         (__u32)__pa(&p_first_ccw->write);
1420                         }
1421                         else {
1422 
1423                         /*make sure we update the CCW atomically
1424                          *so channel does not fetch it when it's only half done
1425                          */
1426                                 memcpy(&pEnd->write1_nop2, &tempCCW ,
1427                                         sizeof(struct ccw1));
1428                                 privptr->p_write_active_last->w_TIC_1.cda=
1429                                         (__u32)__pa(&p_first_ccw->write);
1430 
1431                         } /* end if if (pEnd->write1) */
1432 
1433                         privptr->p_write_active_last->next=p_first_ccw;
1434                         privptr->p_write_active_last=p_last_ccw;
1435                 }
1436 
1437         } /* endif (p_first_ccw!=NULL)  */
1438         dev_kfree_skb_any(skb);
1439         claw_strt_out_IO(dev );
1440         /*      if write free count is zero , set NOBUFFER       */
1441         if (privptr->write_free_count==0) {
1442                 claw_setbit_busy(TB_NOBUFFER,dev);
1443         }
1444 Done2:
1445         claw_clearbit_busy(TB_TX,dev);
1446 Done:
1447         return(rc);
1448 }    /*    end of claw_hw_tx    */
1449 
1450 /*-------------------------------------------------------------------*
1451 *                                                                    *
1452 *     init_ccw_bk                                                    *
1453 *                                                                    *
1454 *--------------------------------------------------------------------*/
1455 
1456 static int
1457 init_ccw_bk(struct net_device *dev)
1458 {
1459 
1460         __u32   ccw_blocks_required;
1461         __u32   ccw_blocks_perpage;
1462         __u32   ccw_pages_required;
1463         __u32   claw_reads_perpage=1;
1464         __u32   claw_read_pages;
1465         __u32   claw_writes_perpage=1;
1466         __u32   claw_write_pages;
1467         void    *p_buff=NULL;
1468         struct ccwbk*p_free_chain;
1469         struct ccwbk*p_buf;
1470         struct ccwbk*p_last_CCWB;
1471         struct ccwbk*p_first_CCWB;
1472         struct endccw *p_endccw=NULL;
1473         addr_t  real_address;
1474         struct claw_privbk *privptr = dev->ml_priv;
1475         struct clawh *pClawH=NULL;
1476         addr_t   real_TIC_address;
1477         int i,j;
1478         CLAW_DBF_TEXT(4, trace, "init_ccw");
1479 
1480         /*  initialize  statistics field */
1481         privptr->active_link_ID=0;
1482         /*  initialize  ccwbk pointers  */
1483         privptr->p_write_free_chain=NULL;   /* pointer to free ccw chain*/
1484         privptr->p_write_active_first=NULL; /* pointer to the first write ccw*/
1485         privptr->p_write_active_last=NULL;  /* pointer to the last write ccw*/
1486         privptr->p_read_active_first=NULL;  /* pointer to the first read ccw*/
1487         privptr->p_read_active_last=NULL;   /* pointer to the last read ccw */
1488         privptr->p_end_ccw=NULL;            /* pointer to ending ccw        */
1489         privptr->p_claw_signal_blk=NULL;    /* pointer to signal block      */
1490         privptr->buffs_alloc = 0;
1491         memset(&privptr->end_ccw, 0x00, sizeof(struct endccw));
1492         memset(&privptr->ctl_bk, 0x00, sizeof(struct clawctl));
1493         /*  initialize  free write ccwbk counter  */
1494         privptr->write_free_count=0;  /* number of free bufs on write chain */
1495         p_last_CCWB = NULL;
1496         p_first_CCWB= NULL;
1497         /*
1498         *  We need 1 CCW block for each read buffer, 1 for each
1499         *  write buffer, plus 1 for ClawSignalBlock
1500         */
1501         ccw_blocks_required =
1502                 privptr->p_env->read_buffers+privptr->p_env->write_buffers+1;
1503         /*
1504         * compute number of CCW blocks that will fit in a page
1505         */
1506         ccw_blocks_perpage= PAGE_SIZE /  CCWBK_SIZE;
1507         ccw_pages_required=
1508                 DIV_ROUND_UP(ccw_blocks_required, ccw_blocks_perpage);
1509 
1510         /*
1511          *  read and write sizes are set by 2 constants in claw.h
1512          *  4k and 32k.  Unpacked values other than 4k are not going to
1513          * provide good performance. With packing buffers support 32k
1514          * buffers are used.
1515          */
1516         if (privptr->p_env->read_size < PAGE_SIZE) {
1517                 claw_reads_perpage = PAGE_SIZE / privptr->p_env->read_size;
1518                 claw_read_pages = DIV_ROUND_UP(privptr->p_env->read_buffers,
1519                                                 claw_reads_perpage);
1520          }
1521          else {       /* > or equal  */
1522                 privptr->p_buff_pages_perread =
1523                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1524                 claw_read_pages = privptr->p_env->read_buffers *
1525                                         privptr->p_buff_pages_perread;
1526          }
1527         if (privptr->p_env->write_size < PAGE_SIZE) {
1528                 claw_writes_perpage =
1529                         PAGE_SIZE / privptr->p_env->write_size;
1530                 claw_write_pages = DIV_ROUND_UP(privptr->p_env->write_buffers,
1531                                                 claw_writes_perpage);
1532 
1533         }
1534         else {      /* >  or equal  */
1535                 privptr->p_buff_pages_perwrite =
1536                         DIV_ROUND_UP(privptr->p_env->read_size, PAGE_SIZE);
1537                 claw_write_pages = privptr->p_env->write_buffers *
1538                                         privptr->p_buff_pages_perwrite;
1539         }
1540         /*
1541         *               allocate ccw_pages_required
1542         */
1543         if (privptr->p_buff_ccw==NULL) {
1544                 privptr->p_buff_ccw=
1545                         (void *)__get_free_pages(__GFP_DMA,
1546                         (int)pages_to_order_of_mag(ccw_pages_required ));
1547                 if (privptr->p_buff_ccw==NULL) {
1548                         return -ENOMEM;
1549                 }
1550                 privptr->p_buff_ccw_num=ccw_pages_required;
1551         }
1552         memset(privptr->p_buff_ccw, 0x00,
1553                 privptr->p_buff_ccw_num * PAGE_SIZE);
1554 
1555         /*
1556         *               obtain ending ccw block address
1557         *
1558         */
1559         privptr->p_end_ccw = (struct endccw *)&privptr->end_ccw;
1560         real_address  = (__u32)__pa(privptr->p_end_ccw);
1561         /*                              Initialize ending CCW block       */
1562         p_endccw=privptr->p_end_ccw;
1563         p_endccw->real=real_address;
1564         p_endccw->write1=0x00;
1565         p_endccw->read1=0x00;
1566 
1567         /*      write1_nop1                                     */
1568         p_endccw->write1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1569         p_endccw->write1_nop1.flags       = CCW_FLAG_SLI | CCW_FLAG_CC;
1570         p_endccw->write1_nop1.count       = 1;
1571         p_endccw->write1_nop1.cda         = 0;
1572 
1573         /*      write1_nop2                                     */
1574         p_endccw->write1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1575         p_endccw->write1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1576         p_endccw->write1_nop2.count      = 1;
1577         p_endccw->write1_nop2.cda        = 0;
1578 
1579         /*      write2_nop1                                     */
1580         p_endccw->write2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1581         p_endccw->write2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1582         p_endccw->write2_nop1.count        = 1;
1583         p_endccw->write2_nop1.cda          = 0;
1584 
1585         /*      write2_nop2                                     */
1586         p_endccw->write2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1587         p_endccw->write2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1588         p_endccw->write2_nop2.count        = 1;
1589         p_endccw->write2_nop2.cda          = 0;
1590 
1591         /*      read1_nop1                                      */
1592         p_endccw->read1_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1593         p_endccw->read1_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1594         p_endccw->read1_nop1.count        = 1;
1595         p_endccw->read1_nop1.cda          = 0;
1596 
1597         /*      read1_nop2                                      */
1598         p_endccw->read1_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1599         p_endccw->read1_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1600         p_endccw->read1_nop2.count        = 1;
1601         p_endccw->read1_nop2.cda          = 0;
1602 
1603         /*      read2_nop1                                      */
1604         p_endccw->read2_nop1.cmd_code = CCW_CLAW_CMD_NOP;
1605         p_endccw->read2_nop1.flags        = CCW_FLAG_SLI | CCW_FLAG_CC;
1606         p_endccw->read2_nop1.count        = 1;
1607         p_endccw->read2_nop1.cda          = 0;
1608 
1609         /*      read2_nop2                                      */
1610         p_endccw->read2_nop2.cmd_code = CCW_CLAW_CMD_READFF;
1611         p_endccw->read2_nop2.flags        = CCW_FLAG_SLI | CCW_FLAG_SKIP;
1612         p_endccw->read2_nop2.count        = 1;
1613         p_endccw->read2_nop2.cda          = 0;
1614 
1615         /*
1616         *                               Build a chain of CCWs
1617         *
1618         */
1619         p_buff=privptr->p_buff_ccw;
1620 
1621         p_free_chain=NULL;
1622         for (i=0 ; i < ccw_pages_required; i++ ) {
1623                 real_address  = (__u32)__pa(p_buff);
1624                 p_buf=p_buff;
1625                 for (j=0 ; j < ccw_blocks_perpage ; j++) {
1626                         p_buf->next  = p_free_chain;
1627                         p_free_chain = p_buf;
1628                         p_buf->real=(__u32)__pa(p_buf);
1629                         ++p_buf;
1630                 }
1631                 p_buff+=PAGE_SIZE;
1632         }
1633         /*
1634         *                               Initialize ClawSignalBlock
1635         *
1636         */
1637         if (privptr->p_claw_signal_blk==NULL) {
1638                 privptr->p_claw_signal_blk=p_free_chain;
1639                 p_free_chain=p_free_chain->next;
1640                 pClawH=(struct clawh *)privptr->p_claw_signal_blk;
1641                 pClawH->length=0xffff;
1642                 pClawH->opcode=0xff;
1643                 pClawH->flag=CLAW_BUSY;
1644         }
1645 
1646         /*
1647         *               allocate write_pages_required and add to free chain
1648         */
1649         if (privptr->p_buff_write==NULL) {
1650             if (privptr->p_env->write_size < PAGE_SIZE) {
1651                 privptr->p_buff_write=
1652                         (void *)__get_free_pages(__GFP_DMA,
1653                         (int)pages_to_order_of_mag(claw_write_pages ));
1654                 if (privptr->p_buff_write==NULL) {
1655                         privptr->p_buff_ccw=NULL;
1656                         return -ENOMEM;
1657                 }
1658                 /*
1659                 *                               Build CLAW write free chain
1660                 *
1661                 */
1662 
1663                 memset(privptr->p_buff_write, 0x00,
1664                         ccw_pages_required * PAGE_SIZE);
1665                 privptr->p_write_free_chain=NULL;
1666 
1667                 p_buff=privptr->p_buff_write;
1668 
1669                 for (i=0 ; i< privptr->p_env->write_buffers ; i++) {
1670                         p_buf        = p_free_chain;      /*  get a CCW */
1671                         p_free_chain = p_buf->next;
1672                         p_buf->next  =privptr->p_write_free_chain;
1673                         privptr->p_write_free_chain = p_buf;
1674                         p_buf-> p_buffer        = (struct clawbuf *)p_buff;
1675                         p_buf-> write.cda       = (__u32)__pa(p_buff);
1676                         p_buf-> write.flags     = CCW_FLAG_SLI | CCW_FLAG_CC;
1677                         p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1678                         p_buf-> w_read_FF.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1679                         p_buf-> w_read_FF.count   = 1;
1680                         p_buf-> w_read_FF.cda     =
1681                                 (__u32)__pa(&p_buf-> header.flag);
1682                         p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1683                         p_buf-> w_TIC_1.flags      = 0;
1684                         p_buf-> w_TIC_1.count      = 0;
1685 
1686                         if (((unsigned long)p_buff +
1687                                             privptr->p_env->write_size) >=
1688                            ((unsigned long)(p_buff+2*
1689                             (privptr->p_env->write_size) - 1) & PAGE_MASK)) {
1690                                 p_buff = p_buff+privptr->p_env->write_size;
1691                         }
1692                 }
1693            }
1694            else      /*  Buffers are => PAGE_SIZE. 1 buff per get_free_pages */
1695            {
1696                privptr->p_write_free_chain=NULL;
1697                for (i = 0; i< privptr->p_env->write_buffers ; i++) {
1698                    p_buff=(void *)__get_free_pages(__GFP_DMA,
1699                         (int)pages_to_order_of_mag(
1700                         privptr->p_buff_pages_perwrite) );
1701                    if (p_buff==NULL) {
1702                         free_pages((unsigned long)privptr->p_buff_ccw,
1703                               (int)pages_to_order_of_mag(
1704                                         privptr->p_buff_ccw_num));
1705                         privptr->p_buff_ccw=NULL;
1706                         p_buf=privptr->p_buff_write;
1707                         while (p_buf!=NULL) {
1708                                 free_pages((unsigned long)
1709                                         p_buf->p_buffer,
1710                                         (int)pages_to_order_of_mag(
1711                                         privptr->p_buff_pages_perwrite));
1712                                 p_buf=p_buf->next;
1713                         }
1714                         return -ENOMEM;
1715                    }  /* Error on get_pages   */
1716                    memset(p_buff, 0x00, privptr->p_env->write_size );
1717                    p_buf         = p_free_chain;
1718                    p_free_chain  = p_buf->next;
1719                    p_buf->next   = privptr->p_write_free_chain;
1720                    privptr->p_write_free_chain = p_buf;
1721                    privptr->p_buff_write = p_buf;
1722                    p_buf->p_buffer=(struct clawbuf *)p_buff;
1723                    p_buf-> write.cda     = (__u32)__pa(p_buff);
1724                    p_buf-> write.flags   = CCW_FLAG_SLI | CCW_FLAG_CC;
1725                    p_buf-> w_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1726                    p_buf-> w_read_FF.flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1727                    p_buf-> w_read_FF.count    = 1;
1728                    p_buf-> w_read_FF.cda      =
1729                         (__u32)__pa(&p_buf-> header.flag);
1730                    p_buf-> w_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1731                    p_buf-> w_TIC_1.flags   = 0;
1732                    p_buf-> w_TIC_1.count   = 0;
1733                }  /* for all write_buffers   */
1734 
1735            }    /* else buffers are PAGE_SIZE or bigger */
1736 
1737         }
1738         privptr->p_buff_write_num=claw_write_pages;
1739         privptr->write_free_count=privptr->p_env->write_buffers;
1740 
1741 
1742         /*
1743         *               allocate read_pages_required and chain to free chain
1744         */
1745         if (privptr->p_buff_read==NULL) {
1746             if (privptr->p_env->read_size < PAGE_SIZE)  {
1747                 privptr->p_buff_read=
1748                         (void *)__get_free_pages(__GFP_DMA,
1749                         (int)pages_to_order_of_mag(claw_read_pages) );
1750                 if (privptr->p_buff_read==NULL) {
1751                         free_pages((unsigned long)privptr->p_buff_ccw,
1752                                 (int)pages_to_order_of_mag(
1753                                         privptr->p_buff_ccw_num));
1754                         /* free the write pages size is < page size  */
1755                         free_pages((unsigned long)privptr->p_buff_write,
1756                                 (int)pages_to_order_of_mag(
1757                                 privptr->p_buff_write_num));
1758                         privptr->p_buff_ccw=NULL;
1759                         privptr->p_buff_write=NULL;
1760                         return -ENOMEM;
1761                 }
1762                 memset(privptr->p_buff_read, 0x00, claw_read_pages * PAGE_SIZE);
1763                 privptr->p_buff_read_num=claw_read_pages;
1764                 /*
1765                 *                               Build CLAW read free chain
1766                 *
1767                 */
1768                 p_buff=privptr->p_buff_read;
1769                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1770                         p_buf        = p_free_chain;
1771                         p_free_chain = p_buf->next;
1772 
1773                         if (p_last_CCWB==NULL) {
1774                                 p_buf->next=NULL;
1775                                 real_TIC_address=0;
1776                                 p_last_CCWB=p_buf;
1777                         }
1778                         else {
1779                                 p_buf->next=p_first_CCWB;
1780                                 real_TIC_address=
1781                                 (__u32)__pa(&p_first_CCWB -> read );
1782                         }
1783 
1784                         p_first_CCWB=p_buf;
1785 
1786                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1787                         /*  initialize read command */
1788                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1789                         p_buf-> read.cda = (__u32)__pa(p_buff);
1790                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1791                         p_buf-> read.count       = privptr->p_env->read_size;
1792 
1793                         /*  initialize read_h command */
1794                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1795                         p_buf-> read_h.cda =
1796                                 (__u32)__pa(&(p_buf->header));
1797                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1798                         p_buf-> read_h.count      = sizeof(struct clawh);
1799 
1800                         /*  initialize Signal command */
1801                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1802                         p_buf-> signal.cda =
1803                                 (__u32)__pa(&(pClawH->flag));
1804                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1805                         p_buf-> signal.count     = 1;
1806 
1807                         /*  initialize r_TIC_1 command */
1808                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1809                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1810                         p_buf-> r_TIC_1.flags = 0;
1811                         p_buf-> r_TIC_1.count      = 0;
1812 
1813                         /*  initialize r_read_FF command */
1814                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1815                         p_buf-> r_read_FF.cda =
1816                                 (__u32)__pa(&(pClawH->flag));
1817                         p_buf-> r_read_FF.flags =
1818                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1819                         p_buf-> r_read_FF.count    = 1;
1820 
1821                         /*    initialize r_TIC_2          */
1822                         memcpy(&p_buf->r_TIC_2,
1823                                 &p_buf->r_TIC_1, sizeof(struct ccw1));
1824 
1825                         /*     initialize Header     */
1826                         p_buf->header.length=0xffff;
1827                         p_buf->header.opcode=0xff;
1828                         p_buf->header.flag=CLAW_PENDING;
1829 
1830                         if (((unsigned long)p_buff+privptr->p_env->read_size) >=
1831                           ((unsigned long)(p_buff+2*(privptr->p_env->read_size)
1832                                  -1)
1833                            & PAGE_MASK)) {
1834                                 p_buff= p_buff+privptr->p_env->read_size;
1835                         }
1836                         else {
1837                                 p_buff=
1838                                 (void *)((unsigned long)
1839                                         (p_buff+2*(privptr->p_env->read_size)-1)
1840                                          & PAGE_MASK) ;
1841                         }
1842                 }   /* for read_buffers   */
1843           }         /* read_size < PAGE_SIZE  */
1844           else {  /* read Size >= PAGE_SIZE  */
1845                 for (i=0 ; i< privptr->p_env->read_buffers ; i++) {
1846                         p_buff = (void *)__get_free_pages(__GFP_DMA,
1847                                 (int)pages_to_order_of_mag(
1848                                         privptr->p_buff_pages_perread));
1849                         if (p_buff==NULL) {
1850                                 free_pages((unsigned long)privptr->p_buff_ccw,
1851                                         (int)pages_to_order_of_mag(privptr->
1852                                         p_buff_ccw_num));
1853                                 /* free the write pages  */
1854                                 p_buf=privptr->p_buff_write;
1855                                 while (p_buf!=NULL) {
1856                                         free_pages(
1857                                             (unsigned long)p_buf->p_buffer,
1858                                             (int)pages_to_order_of_mag(
1859                                             privptr->p_buff_pages_perwrite));
1860                                         p_buf=p_buf->next;
1861                                 }
1862                                 /* free any read pages already alloc  */
1863                                 p_buf=privptr->p_buff_read;
1864                                 while (p_buf!=NULL) {
1865                                         free_pages(
1866                                             (unsigned long)p_buf->p_buffer,
1867                                             (int)pages_to_order_of_mag(
1868                                              privptr->p_buff_pages_perread));
1869                                         p_buf=p_buf->next;
1870                                 }
1871                                 privptr->p_buff_ccw=NULL;
1872                                 privptr->p_buff_write=NULL;
1873                                 return -ENOMEM;
1874                         }
1875                         memset(p_buff, 0x00, privptr->p_env->read_size);
1876                         p_buf        = p_free_chain;
1877                         privptr->p_buff_read = p_buf;
1878                         p_free_chain = p_buf->next;
1879 
1880                         if (p_last_CCWB==NULL) {
1881                                 p_buf->next=NULL;
1882                                 real_TIC_address=0;
1883                                 p_last_CCWB=p_buf;
1884                         }
1885                         else {
1886                                 p_buf->next=p_first_CCWB;
1887                                 real_TIC_address=
1888                                         (addr_t)__pa(
1889                                                 &p_first_CCWB -> read );
1890                         }
1891 
1892                         p_first_CCWB=p_buf;
1893                                 /* save buff address */
1894                         p_buf->p_buffer=(struct clawbuf *)p_buff;
1895                         /*  initialize read command */
1896                         p_buf-> read.cmd_code = CCW_CLAW_CMD_READ;
1897                         p_buf-> read.cda = (__u32)__pa(p_buff);
1898                         p_buf-> read.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1899                         p_buf-> read.count       = privptr->p_env->read_size;
1900 
1901                         /*  initialize read_h command */
1902                         p_buf-> read_h.cmd_code = CCW_CLAW_CMD_READHEADER;
1903                         p_buf-> read_h.cda =
1904                                 (__u32)__pa(&(p_buf->header));
1905                         p_buf-> read_h.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1906                         p_buf-> read_h.count      = sizeof(struct clawh);
1907 
1908                         /*  initialize Signal command */
1909                         p_buf-> signal.cmd_code = CCW_CLAW_CMD_SIGNAL_SMOD;
1910                         p_buf-> signal.cda =
1911                                 (__u32)__pa(&(pClawH->flag));
1912                         p_buf-> signal.flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1913                         p_buf-> signal.count     = 1;
1914 
1915                         /*  initialize r_TIC_1 command */
1916                         p_buf-> r_TIC_1.cmd_code = CCW_CLAW_CMD_TIC;
1917                         p_buf-> r_TIC_1.cda = (__u32)real_TIC_address;
1918                         p_buf-> r_TIC_1.flags = 0;
1919                         p_buf-> r_TIC_1.count      = 0;
1920 
1921                         /*  initialize r_read_FF command */
1922                         p_buf-> r_read_FF.cmd_code = CCW_CLAW_CMD_READFF;
1923                         p_buf-> r_read_FF.cda =
1924                                 (__u32)__pa(&(pClawH->flag));
1925                         p_buf-> r_read_FF.flags =
1926                                 CCW_FLAG_SLI | CCW_FLAG_CC | CCW_FLAG_PCI;
1927                         p_buf-> r_read_FF.count    = 1;
1928 
1929                         /*    initialize r_TIC_2          */
1930                         memcpy(&p_buf->r_TIC_2, &p_buf->r_TIC_1,
1931                                 sizeof(struct ccw1));
1932 
1933                         /*     initialize Header     */
1934                         p_buf->header.length=0xffff;
1935                         p_buf->header.opcode=0xff;
1936                         p_buf->header.flag=CLAW_PENDING;
1937 
1938                 }    /* For read_buffers   */
1939           }     /*  read_size >= PAGE_SIZE   */
1940         }       /*  pBuffread = NULL */
1941         add_claw_reads( dev  ,p_first_CCWB , p_last_CCWB);
1942         privptr->buffs_alloc = 1;
1943 
1944         return 0;
1945 }    /*    end of init_ccw_bk */
1946 
1947 /*-------------------------------------------------------------------*
1948 *                                                                    *
1949 *       probe_error                                                  *
1950 *                                                                    *
1951 *--------------------------------------------------------------------*/
1952 
1953 static void
1954 probe_error( struct ccwgroup_device *cgdev)
1955 {
1956         struct claw_privbk *privptr;
1957 
1958         CLAW_DBF_TEXT(4, trace, "proberr");
1959         privptr = dev_get_drvdata(&cgdev->dev);
1960         if (privptr != NULL) {
1961                 dev_set_drvdata(&cgdev->dev, NULL);
1962                 kfree(privptr->p_env);
1963                 kfree(privptr->p_mtc_envelope);
1964                 kfree(privptr);
1965         }
1966 }    /*    probe_error    */
1967 
1968 /*-------------------------------------------------------------------*
1969 *    claw_process_control                                            *
1970 *                                                                    *
1971 *                                                                    *
1972 *--------------------------------------------------------------------*/
1973 
1974 static int
1975 claw_process_control( struct net_device *dev, struct ccwbk * p_ccw)
1976 {
1977 
1978         struct clawbuf *p_buf;
1979         struct clawctl  ctlbk;
1980         struct clawctl *p_ctlbk;
1981         char    temp_host_name[8];
1982         char    temp_ws_name[8];
1983         struct claw_privbk *privptr;
1984         struct claw_env *p_env;
1985         struct sysval *p_sysval;
1986         struct conncmd *p_connect=NULL;
1987         int rc;
1988         struct chbk *p_ch = NULL;
1989         struct device *tdev;
1990         CLAW_DBF_TEXT(2, setup, "clw_cntl");
1991         udelay(1000);  /* Wait a ms for the control packets to
1992                         *catch up to each other */
1993         privptr = dev->ml_priv;
1994         p_env=privptr->p_env;
1995         tdev = &privptr->channel[READ_CHANNEL].cdev->dev;
1996         memcpy( &temp_host_name, p_env->host_name, 8);
1997         memcpy( &temp_ws_name, p_env->adapter_name , 8);
1998         dev_info(tdev, "%s: CLAW device %.8s: "
1999                 "Received Control Packet\n",
2000                 dev->name, temp_ws_name);
2001         if (privptr->release_pend==1) {
2002                 return 0;
2003         }
2004         p_buf=p_ccw->p_buffer;
2005         p_ctlbk=&ctlbk;
2006         if (p_env->packing == DO_PACKED) { /* packing in progress?*/
2007                 memcpy(p_ctlbk, &p_buf->buffer[4], sizeof(struct clawctl));
2008         } else {
2009                 memcpy(p_ctlbk, p_buf, sizeof(struct clawctl));
2010         }
2011         switch (p_ctlbk->command)
2012         {
2013         case SYSTEM_VALIDATE_REQUEST:
2014                 if (p_ctlbk->version != CLAW_VERSION_ID) {
2015                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2016                                 CLAW_RC_WRONG_VERSION);
2017                         dev_warn(tdev, "The communication peer of %s"
2018                                 " uses an incorrect API version %d\n",
2019                                 dev->name, p_ctlbk->version);
2020                 }
2021                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2022                 dev_info(tdev, "%s: Recv Sys Validate Request: "
2023                         "Vers=%d,link_id=%d,Corr=%d,WS name=%.8s,"
2024                         "Host name=%.8s\n",
2025                         dev->name, p_ctlbk->version,
2026                         p_ctlbk->linkid,
2027                         p_ctlbk->correlator,
2028                         p_sysval->WS_name,
2029                         p_sysval->host_name);
2030                 if (memcmp(temp_host_name, p_sysval->host_name, 8)) {
2031                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2032                                 CLAW_RC_NAME_MISMATCH);
2033                         CLAW_DBF_TEXT(2, setup, "HSTBAD");
2034                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->host_name);
2035                         CLAW_DBF_TEXT_(2, setup, "%s", temp_host_name);
2036                         dev_warn(tdev,
2037                                 "Host name %s for %s does not match the"
2038                                 " remote adapter name %s\n",
2039                                 p_sysval->host_name,
2040                                 dev->name,
2041                                 temp_host_name);
2042                 }
2043                 if (memcmp(temp_ws_name, p_sysval->WS_name, 8)) {
2044                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2045                                 CLAW_RC_NAME_MISMATCH);
2046                         CLAW_DBF_TEXT(2, setup, "WSNBAD");
2047                         CLAW_DBF_TEXT_(2, setup, "%s", p_sysval->WS_name);
2048                         CLAW_DBF_TEXT_(2, setup, "%s", temp_ws_name);
2049                         dev_warn(tdev, "Adapter name %s for %s does not match"
2050                                 " the remote host name %s\n",
2051                                 p_sysval->WS_name,
2052                                 dev->name,
2053                                 temp_ws_name);
2054                 }
2055                 if ((p_sysval->write_frame_size < p_env->write_size) &&
2056                     (p_env->packing == 0)) {
2057                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2058                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2059                         dev_warn(tdev,
2060                                 "The local write buffer is smaller than the"
2061                                 " remote read buffer\n");
2062                         CLAW_DBF_TEXT(2, setup, "wrtszbad");
2063                 }
2064                 if ((p_sysval->read_frame_size < p_env->read_size) &&
2065                     (p_env->packing == 0)) {
2066                         claw_snd_sys_validate_rsp(dev, p_ctlbk,
2067                                 CLAW_RC_HOST_RCV_TOO_SMALL);
2068                         dev_warn(tdev,
2069                                 "The local read buffer is smaller than the"
2070                                 " remote write buffer\n");
2071                         CLAW_DBF_TEXT(2, setup, "rdsizbad");
2072                 }
2073                 claw_snd_sys_validate_rsp(dev, p_ctlbk, 0);
2074                 dev_info(tdev,
2075                         "CLAW device %.8s: System validate"
2076                         " completed.\n", temp_ws_name);
2077                 dev_info(tdev,
2078                         "%s: sys Validate Rsize:%d Wsize:%d\n",
2079                         dev->name, p_sysval->read_frame_size,
2080                         p_sysval->write_frame_size);
2081                 privptr->system_validate_comp = 1;
2082                 if (strncmp(p_env->api_type, WS_APPL_NAME_PACKED, 6) == 0)
2083                         p_env->packing = PACKING_ASK;
2084                 claw_strt_conn_req(dev);
2085                 break;
2086         case SYSTEM_VALIDATE_RESPONSE:
2087                 p_sysval = (struct sysval *)&(p_ctlbk->data);
2088                 dev_info(tdev,
2089                         "Settings for %s validated (version=%d, "
2090                         "remote device=%d, rc=%d, adapter name=%.8s, "
2091                         "host name=%.8s)\n",
2092                         dev->name,
2093                         p_ctlbk->version,
2094                         p_ctlbk->correlator,
2095                         p_ctlbk->rc,
2096                         p_sysval->WS_name,
2097                         p_sysval->host_name);
2098                 switch (p_ctlbk->rc) {
2099                 case 0:
2100                         dev_info(tdev, "%s: CLAW device "
2101                                 "%.8s: System validate completed.\n",
2102                                 dev->name, temp_ws_name);
2103                         if (privptr->system_validate_comp == 0)
2104                                 claw_strt_conn_req(dev);
2105                         privptr->system_validate_comp = 1;
2106                         break;
2107                 case CLAW_RC_NAME_MISMATCH:
2108                         dev_warn(tdev, "Validating %s failed because of"
2109                                 " a host or adapter name mismatch\n",
2110                                 dev->name);
2111                         break;
2112                 case CLAW_RC_WRONG_VERSION:
2113                         dev_warn(tdev, "Validating %s failed because of a"
2114                                 " version conflict\n",
2115                                 dev->name);
2116                         break;
2117                 case CLAW_RC_HOST_RCV_TOO_SMALL:
2118                         dev_warn(tdev, "Validating %s failed because of a"
2119                                 " frame size conflict\n",
2120                                 dev->name);
2121                         break;
2122                 default:
2123                         dev_warn(tdev, "The communication peer of %s rejected"
2124                                 " the connection\n",
2125                                  dev->name);
2126                         break;
2127                 }
2128                 break;
2129 
2130         case CONNECTION_REQUEST:
2131                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2132                 dev_info(tdev, "%s: Recv Conn Req: Vers=%d,link_id=%d,"
2133                         "Corr=%d,HOST appl=%.8s,WS appl=%.8s\n",
2134                         dev->name,
2135                         p_ctlbk->version,
2136                         p_ctlbk->linkid,
2137                         p_ctlbk->correlator,
2138                         p_connect->host_name,
2139                         p_connect->WS_name);
2140                 if (privptr->active_link_ID != 0) {
2141                         claw_snd_disc(dev, p_ctlbk);
2142                         dev_info(tdev, "%s rejected a connection request"
2143                                 " because it is already active\n",
2144                                 dev->name);
2145                 }
2146                 if (p_ctlbk->linkid != 1) {
2147                         claw_snd_disc(dev, p_ctlbk);
2148                         dev_info(tdev, "%s rejected a request to open multiple"
2149                                 " connections\n",
2150                                 dev->name);
2151                 }
2152                 rc = find_link(dev, p_connect->host_name, p_connect->WS_name);
2153                 if (rc != 0) {
2154                         claw_snd_disc(dev, p_ctlbk);
2155                         dev_info(tdev, "%s rejected a connection request"
2156                                 " because of a type mismatch\n",
2157                                 dev->name);
2158                 }
2159                 claw_send_control(dev,
2160                         CONNECTION_CONFIRM, p_ctlbk->linkid,
2161                         p_ctlbk->correlator,
2162                         0, p_connect->host_name,
2163                         p_connect->WS_name);
2164                 if (p_env->packing == PACKING_ASK) {
2165                         p_env->packing = PACK_SEND;
2166                         claw_snd_conn_req(dev, 0);
2167                 }
2168                 dev_info(tdev, "%s: CLAW device %.8s: Connection "
2169                         "completed link_id=%d.\n",
2170                         dev->name, temp_ws_name,
2171                         p_ctlbk->linkid);
2172                         privptr->active_link_ID = p_ctlbk->linkid;
2173                         p_ch = &privptr->channel[WRITE_CHANNEL];
2174                         wake_up(&p_ch->wait);  /* wake up claw_open ( WRITE) */
2175                 break;
2176         case CONNECTION_RESPONSE:
2177                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2178                 dev_info(tdev, "%s: Recv Conn Resp: Vers=%d,link_id=%d,"
2179                         "Corr=%d,RC=%d,Host appl=%.8s, WS appl=%.8s\n",
2180                         dev->name,
2181                         p_ctlbk->version,
2182                         p_ctlbk->linkid,
2183                         p_ctlbk->correlator,
2184                         p_ctlbk->rc,
2185                         p_connect->host_name,
2186                         p_connect->WS_name);
2187 
2188                 if (p_ctlbk->rc != 0) {
2189                         dev_warn(tdev, "The communication peer of %s rejected"
2190                                 " a connection request\n",
2191                                 dev->name);
2192                         return 1;
2193                 }
2194                 rc = find_link(dev,
2195                         p_connect->host_name, p_connect->WS_name);
2196                 if (rc != 0) {
2197                         claw_snd_disc(dev, p_ctlbk);
2198                         dev_warn(tdev, "The communication peer of %s"
2199                                 " rejected a connection "
2200                                 "request because of a type mismatch\n",
2201                                  dev->name);
2202                 }
2203                 /* should be until CONNECTION_CONFIRM */
2204                 privptr->active_link_ID = -(p_ctlbk->linkid);
2205                 break;
2206         case CONNECTION_CONFIRM:
2207                 p_connect = (struct conncmd *)&(p_ctlbk->data);
2208                 dev_info(tdev,
2209                         "%s: Recv Conn Confirm:Vers=%d,link_id=%d,"
2210                         "Corr=%d,Host appl=%.8s,WS appl=%.8s\n",
2211                         dev->name,
2212                         p_ctlbk->version,
2213                         p_ctlbk->linkid,
2214                         p_ctlbk->correlator,
2215                         p_connect->host_name,
2216                         p_connect->WS_name);
2217                 if (p_ctlbk->linkid == -(privptr->active_link_ID)) {
2218                         privptr->active_link_ID = p_ctlbk->linkid;
2219                         if (p_env->packing > PACKING_ASK) {
2220                                 dev_info(tdev,
2221                                 "%s: Confirmed Now packing\n", dev->name);
2222                                 p_env->packing = DO_PACKED;
2223                         }
2224                         p_ch = &privptr->channel[WRITE_CHANNEL];
2225                         wake_up(&p_ch->wait);
2226                 } else {
2227                         dev_warn(tdev, "Activating %s failed because of"
2228                                 " an incorrect link ID=%d\n",
2229                                 dev->name, p_ctlbk->linkid);
2230                         claw_snd_disc(dev, p_ctlbk);
2231                 }
2232                 break;
2233         case DISCONNECT:
2234                 dev_info(tdev, "%s: Disconnect: "
2235                         "Vers=%d,link_id=%d,Corr=%d\n",
2236                         dev->name, p_ctlbk->version,
2237                         p_ctlbk->linkid, p_ctlbk->correlator);
2238                 if ((p_ctlbk->linkid == 2) &&
2239                     (p_env->packing == PACK_SEND)) {
2240                         privptr->active_link_ID = 1;
2241                         p_env->packing = DO_PACKED;
2242                 } else
2243                         privptr->active_link_ID = 0;
2244                 break;
2245         case CLAW_ERROR:
2246                 dev_warn(tdev, "The communication peer of %s failed\n",
2247                         dev->name);
2248                 break;
2249         default:
2250                 dev_warn(tdev, "The communication peer of %s sent"
2251                         " an unknown command code\n",
2252                         dev->name);
2253                 break;
2254         }
2255 
2256         return 0;
2257 }   /*    end of claw_process_control    */
2258 
2259 
2260 /*-------------------------------------------------------------------*
2261 *               claw_send_control                                    *
2262 *                                                                    *
2263 *--------------------------------------------------------------------*/
2264 
2265 static int
2266 claw_send_control(struct net_device *dev, __u8 type, __u8 link,
2267          __u8 correlator, __u8 rc, char *local_name, char *remote_name)
2268 {
2269         struct claw_privbk              *privptr;
2270         struct clawctl                  *p_ctl;
2271         struct sysval                   *p_sysval;
2272         struct conncmd                  *p_connect;
2273         struct sk_buff                  *skb;
2274 
2275         CLAW_DBF_TEXT(2, setup, "sndcntl");
2276         privptr = dev->ml_priv;
2277         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2278 
2279         p_ctl->command=type;
2280         p_ctl->version=CLAW_VERSION_ID;
2281         p_ctl->linkid=link;
2282         p_ctl->correlator=correlator;
2283         p_ctl->rc=rc;
2284 
2285         p_sysval=(struct sysval *)&p_ctl->data;
2286         p_connect=(struct conncmd *)&p_ctl->data;
2287 
2288         switch (p_ctl->command) {
2289                 case SYSTEM_VALIDATE_REQUEST:
2290                 case SYSTEM_VALIDATE_RESPONSE:
2291                         memcpy(&p_sysval->host_name, local_name, 8);
2292                         memcpy(&p_sysval->WS_name, remote_name, 8);
2293                         if (privptr->p_env->packing > 0) {
2294                                 p_sysval->read_frame_size = DEF_PACK_BUFSIZE;
2295                                 p_sysval->write_frame_size = DEF_PACK_BUFSIZE;
2296                         } else {
2297                                 /* how big is the biggest group of packets */
2298                            p_sysval->read_frame_size =
2299                                 privptr->p_env->read_size;
2300                            p_sysval->write_frame_size =
2301                                 privptr->p_env->write_size;
2302                         }
2303                         memset(&p_sysval->reserved, 0x00, 4);
2304                         break;
2305                 case CONNECTION_REQUEST:
2306                 case CONNECTION_RESPONSE:
2307                 case CONNECTION_CONFIRM:
2308                 case DISCONNECT:
2309                         memcpy(&p_sysval->host_name, local_name, 8);
2310                         memcpy(&p_sysval->WS_name, remote_name, 8);
2311                         if (privptr->p_env->packing > 0) {
2312                         /* How big is the biggest packet */
2313                                 p_connect->reserved1[0]=CLAW_FRAME_SIZE;
2314                                 p_connect->reserved1[1]=CLAW_FRAME_SIZE;
2315                         } else {
2316                                 memset(&p_connect->reserved1, 0x00, 4);
2317                                 memset(&p_connect->reserved2, 0x00, 4);
2318                         }
2319                         break;
2320                 default:
2321                         break;
2322         }
2323 
2324         /*      write Control Record to the device                   */
2325 
2326 
2327         skb = dev_alloc_skb(sizeof(struct clawctl));
2328         if (!skb) {
2329                 return -ENOMEM;
2330         }
2331         memcpy(skb_put(skb, sizeof(struct clawctl)),
2332                 p_ctl, sizeof(struct clawctl));
2333         if (privptr->p_env->packing >= PACK_SEND)
2334                 claw_hw_tx(skb, dev, 1);
2335         else
2336                 claw_hw_tx(skb, dev, 0);
2337         return 0;
2338 }  /*   end of claw_send_control  */
2339 
2340 /*-------------------------------------------------------------------*
2341 *               claw_snd_conn_req                                    *
2342 *                                                                    *
2343 *--------------------------------------------------------------------*/
2344 static int
2345 claw_snd_conn_req(struct net_device *dev, __u8 link)
2346 {
2347         int                rc;
2348         struct claw_privbk *privptr = dev->ml_priv;
2349         struct clawctl     *p_ctl;
2350 
2351         CLAW_DBF_TEXT(2, setup, "snd_conn");
2352         rc = 1;
2353         p_ctl=(struct clawctl *)&privptr->ctl_bk;
2354         p_ctl->linkid = link;
2355         if ( privptr->system_validate_comp==0x00 ) {
2356                 return rc;
2357         }
2358         if (privptr->p_env->packing == PACKING_ASK )
2359                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2360                         WS_APPL_NAME_PACKED, WS_APPL_NAME_PACKED);
2361         if (privptr->p_env->packing == PACK_SEND)  {
2362                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2363                         WS_APPL_NAME_IP_NAME, WS_APPL_NAME_IP_NAME);
2364         }
2365         if (privptr->p_env->packing == 0)
2366                 rc=claw_send_control(dev, CONNECTION_REQUEST,0,0,0,
2367                         HOST_APPL_NAME, privptr->p_env->api_type);
2368         return rc;
2369 
2370 }  /*  end of claw_snd_conn_req */
2371 
2372 
2373 /*-------------------------------------------------------------------*
2374 *               claw_snd_disc                                        *
2375 *                                                                    *
2376 *--------------------------------------------------------------------*/
2377 
2378 static int
2379 claw_snd_disc(struct net_device *dev, struct clawctl * p_ctl)
2380 {
2381         int rc;
2382         struct conncmd *  p_connect;
2383 
2384         CLAW_DBF_TEXT(2, setup, "snd_dsc");
2385         p_connect=(struct conncmd *)&p_ctl->data;
2386 
2387         rc=claw_send_control(dev, DISCONNECT, p_ctl->linkid,
2388                 p_ctl->correlator, 0,
2389                 p_connect->host_name, p_connect->WS_name);
2390         return rc;
2391 }     /*   end of claw_snd_disc    */
2392 
2393 
2394 /*-------------------------------------------------------------------*
2395 *               claw_snd_sys_validate_rsp                            *
2396 *                                                                    *
2397 *--------------------------------------------------------------------*/
2398 
2399 static int
2400 claw_snd_sys_validate_rsp(struct net_device *dev,
2401         struct clawctl *p_ctl, __u32 return_code)
2402 {
2403         struct claw_env *  p_env;
2404         struct claw_privbk *privptr;
2405         int    rc;
2406 
2407         CLAW_DBF_TEXT(2, setup, "chkresp");
2408         privptr = dev->ml_priv;
2409         p_env=privptr->p_env;
2410         rc=claw_send_control(dev, SYSTEM_VALIDATE_RESPONSE,
2411                 p_ctl->linkid,
2412                 p_ctl->correlator,
2413                 return_code,
2414                 p_env->host_name,
2415                 p_env->adapter_name  );
2416         return rc;
2417 }     /*    end of claw_snd_sys_validate_rsp    */
2418 
2419 /*-------------------------------------------------------------------*
2420 *               claw_strt_conn_req                                   *
2421 *                                                                    *
2422 *--------------------------------------------------------------------*/
2423 
2424 static int
2425 claw_strt_conn_req(struct net_device *dev )
2426 {
2427         int rc;
2428 
2429         CLAW_DBF_TEXT(2, setup, "conn_req");
2430         rc=claw_snd_conn_req(dev, 1);
2431         return rc;
2432 }    /*   end of claw_strt_conn_req   */
2433 
2434 
2435 
2436 /*-------------------------------------------------------------------*
2437  *   claw_stats                                                      *
2438  *-------------------------------------------------------------------*/
2439 
2440 static struct
2441 net_device_stats *claw_stats(struct net_device *dev)
2442 {
2443         struct claw_privbk *privptr;
2444 
2445         CLAW_DBF_TEXT(4, trace, "stats");
2446         privptr = dev->ml_priv;
2447         return &privptr->stats;
2448 }     /*   end of claw_stats   */
2449 
2450 
2451 /*-------------------------------------------------------------------*
2452 *       unpack_read                                                  *
2453 *                                                                    *
2454 *--------------------------------------------------------------------*/
2455 static void
2456 unpack_read(struct net_device *dev )
2457 {
2458         struct sk_buff *skb;
2459         struct claw_privbk *privptr;
2460         struct claw_env    *p_env;
2461         struct ccwbk    *p_this_ccw;
2462         struct ccwbk    *p_first_ccw;
2463         struct ccwbk    *p_last_ccw;
2464         struct clawph   *p_packh;
2465         void            *p_packd;
2466         struct clawctl  *p_ctlrec=NULL;
2467         struct device   *p_dev;
2468 
2469         __u32   len_of_data;
2470         __u32   pack_off;
2471         __u8    link_num;
2472         __u8    mtc_this_frm=0;
2473         __u32   bytes_to_mov;
2474         int     i=0;
2475         int     p=0;
2476 
2477         CLAW_DBF_TEXT(4, trace, "unpkread");
2478         p_first_ccw=NULL;
2479         p_last_ccw=NULL;
2480         p_packh=NULL;
2481         p_packd=NULL;
2482         privptr = dev->ml_priv;
2483 
2484         p_dev = &privptr->channel[READ_CHANNEL].cdev->dev;
2485         p_env = privptr->p_env;
2486         p_this_ccw=privptr->p_read_active_first;
2487         while (p_this_ccw!=NULL && p_this_ccw->header.flag!=CLAW_PENDING) {
2488                 pack_off = 0;
2489                 p = 0;
2490                 p_this_ccw->header.flag=CLAW_PENDING;
2491                 privptr->p_read_active_first=p_this_ccw->next;
2492                 p_this_ccw->next=NULL;
2493                 p_packh = (struct clawph *)p_this_ccw->p_buffer;
2494                 if ((p_env->packing == PACK_SEND) &&
2495                     (p_packh->len == 32)           &&
2496                     (p_packh->link_num == 0)) {   /* is it a packed ctl rec? */
2497                         p_packh++;  /* peek past pack header */
2498                         p_ctlrec = (struct clawctl *)p_packh;
2499                         p_packh--;  /* un peek */
2500                         if ((p_ctlrec->command == CONNECTION_RESPONSE) ||
2501                             (p_ctlrec->command == CONNECTION_CONFIRM))
2502                                 p_env->packing = DO_PACKED;
2503                 }
2504                 if (p_env->packing == DO_PACKED)
2505                         link_num=p_packh->link_num;
2506                 else
2507                         link_num=p_this_ccw->header.opcode / 8;
2508                 if ((p_this_ccw->header.opcode & MORE_to_COME_FLAG)!=0) {
2509                         mtc_this_frm=1;
2510                         if (p_this_ccw->header.length!=
2511                                 privptr->p_env->read_size ) {
2512                                 dev_warn(p_dev,
2513                                         "The communication peer of %s"
2514                                         " sent a faulty"
2515                                         " frame of length %02x\n",
2516                                         dev->name, p_this_ccw->header.length);
2517                         }
2518                 }
2519 
2520                 if (privptr->mtc_skipping) {
2521                         /*
2522                         *   We're in the mode of skipping past a
2523                         *   multi-frame message
2524                         *   that we can't process for some reason or other.
2525                         *   The first frame without the More-To-Come flag is
2526                         *   the last frame of the skipped message.
2527                         */
2528                         /*  in case of More-To-Come not set in this frame */
2529                         if (mtc_this_frm==0) {
2530                                 privptr->mtc_skipping=0; /* Ok, the end */
2531                                 privptr->mtc_logical_link=-1;
2532                         }
2533                         goto NextFrame;
2534                 }
2535 
2536                 if (link_num==0) {
2537                         claw_process_control(dev, p_this_ccw);
2538                         CLAW_DBF_TEXT(4, trace, "UnpkCntl");
2539                         goto NextFrame;
2540                 }
2541 unpack_next:
2542                 if (p_env->packing == DO_PACKED) {
2543                         if (pack_off > p_env->read_size)
2544                                 goto NextFrame;
2545                         p_packd = p_this_ccw->p_buffer+pack_off;
2546                         p_packh = (struct clawph *) p_packd;
2547                         if ((p_packh->len == 0) || /* done with this frame? */
2548                             (p_packh->flag != 0))
2549                                 goto NextFrame;
2550                         bytes_to_mov = p_packh->len;
2551                         pack_off += bytes_to_mov+sizeof(struct clawph);
2552                         p++;
2553                 } else {
2554                         bytes_to_mov=p_this_ccw->header.length;
2555                 }
2556                 if (privptr->mtc_logical_link<0) {
2557 
2558                 /*
2559                 *  if More-To-Come is set in this frame then we don't know
2560                 *  length of entire message, and hence have to allocate
2561                 *  large buffer   */
2562 
2563                 /*      We are starting a new envelope  */
2564                 privptr->mtc_offset=0;
2565                         privptr->mtc_logical_link=link_num;
2566                 }
2567 
2568                 if (bytes_to_mov > (MAX_ENVELOPE_SIZE- privptr->mtc_offset) ) {
2569                         /*      error     */
2570                         privptr->stats.rx_frame_errors++;
2571                         goto NextFrame;
2572                 }
2573                 if (p_env->packing == DO_PACKED) {
2574                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2575                                 p_packd+sizeof(struct clawph), bytes_to_mov);
2576 
2577                 } else  {
2578                         memcpy( privptr->p_mtc_envelope+ privptr->mtc_offset,
2579                                 p_this_ccw->p_buffer, bytes_to_mov);
2580                 }
2581                 if (mtc_this_frm==0) {
2582                         len_of_data=privptr->mtc_offset+bytes_to_mov;
2583                         skb=dev_alloc_skb(len_of_data);
2584                         if (skb) {
2585                                 memcpy(skb_put(skb,len_of_data),
2586                                         privptr->p_mtc_envelope,
2587                                         len_of_data);
2588                                 skb->dev=dev;
2589                                 skb_reset_mac_header(skb);
2590                                 skb->protocol=htons(ETH_P_IP);
2591                                 skb->ip_summed=CHECKSUM_UNNECESSARY;
2592                                 privptr->stats.rx_packets++;
2593                                 privptr->stats.rx_bytes+=len_of_data;
2594                                 netif_rx(skb);
2595                         }
2596                         else {
2597                                 dev_info(p_dev, "Allocating a buffer for"
2598                                         " incoming data failed\n");
2599                                 privptr->stats.rx_dropped++;
2600                         }
2601                         privptr->mtc_offset=0;
2602                         privptr->mtc_logical_link=-1;
2603                 }
2604                 else {
2605                         privptr->mtc_offset+=bytes_to_mov;
2606                 }
2607                 if (p_env->packing == DO_PACKED)
2608                         goto unpack_next;
2609 NextFrame:
2610                 /*
2611                 *   Remove ThisCCWblock from active read queue, and add it
2612                 *   to queue of free blocks to be reused.
2613                 */
2614                 i++;
2615                 p_this_ccw->header.length=0xffff;
2616                 p_this_ccw->header.opcode=0xff;
2617                 /*
2618                 *       add this one to the free queue for later reuse
2619                 */
2620                 if (p_first_ccw==NULL) {
2621                         p_first_ccw = p_this_ccw;
2622                 }
2623                 else {
2624                         p_last_ccw->next = p_this_ccw;
2625                 }
2626                 p_last_ccw = p_this_ccw;
2627                 /*
2628                 *       chain to next block on active read queue
2629                 */
2630                 p_this_ccw = privptr->p_read_active_first;
2631                 CLAW_DBF_TEXT_(4, trace, "rxpkt %d", p);
2632         } /* end of while */
2633 
2634         /*      check validity                  */
2635 
2636         CLAW_DBF_TEXT_(4, trace, "rxfrm %d", i);
2637         add_claw_reads(dev, p_first_ccw, p_last_ccw);
2638         claw_strt_read(dev, LOCK_YES);
2639         return;
2640 }     /*  end of unpack_read   */
2641 
2642 /*-------------------------------------------------------------------*
2643 *       claw_strt_read                                               *
2644 *                                                                    *
2645 *--------------------------------------------------------------------*/
2646 static void
2647 claw_strt_read (struct net_device *dev, int lock )
2648 {
2649         int        rc = 0;
2650         __u32      parm;
2651         unsigned long  saveflags = 0;
2652         struct claw_privbk *privptr = dev->ml_priv;
2653         struct ccwbk*p_ccwbk;
2654         struct chbk *p_ch;
2655         struct clawh *p_clawh;
2656         p_ch = &privptr->channel[READ_CHANNEL];
2657 
2658         CLAW_DBF_TEXT(4, trace, "StRdNter");
2659         p_clawh=(struct clawh *)privptr->p_claw_signal_blk;
2660         p_clawh->flag=CLAW_IDLE;    /* 0x00 */
2661 
2662         if ((privptr->p_write_active_first!=NULL &&
2663              privptr->p_write_active_first->header.flag!=CLAW_PENDING) ||
2664             (privptr->p_read_active_first!=NULL &&
2665              privptr->p_read_active_first->header.flag!=CLAW_PENDING )) {
2666                 p_clawh->flag=CLAW_BUSY;    /* 0xff */
2667         }
2668         if (lock==LOCK_YES) {
2669                 spin_lock_irqsave(get_ccwdev_lock(p_ch->cdev), saveflags);
2670         }
2671         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2672                 CLAW_DBF_TEXT(4, trace, "HotRead");
2673                 p_ccwbk=privptr->p_read_active_first;
2674                 parm = (unsigned long) p_ch;
2675                 rc = ccw_device_start (p_ch->cdev, &p_ccwbk->read, parm,
2676                                        0xff, 0);
2677                 if (rc != 0) {
2678                         ccw_check_return_code(p_ch->cdev, rc);
2679                 }
2680         }
2681         else {
2682                 CLAW_DBF_TEXT(2, trace, "ReadAct");
2683         }
2684 
2685         if (lock==LOCK_YES) {
2686                 spin_unlock_irqrestore(get_ccwdev_lock(p_ch->cdev), saveflags);
2687         }
2688         CLAW_DBF_TEXT(4, trace, "StRdExit");
2689         return;
2690 }       /*    end of claw_strt_read    */
2691 
2692 /*-------------------------------------------------------------------*
2693 *       claw_strt_out_IO                                             *
2694 *                                                                    *
2695 *--------------------------------------------------------------------*/
2696 
2697 static void
2698 claw_strt_out_IO( struct net_device *dev )
2699 {
2700         int                     rc = 0;
2701         unsigned long           parm;
2702         struct claw_privbk      *privptr;
2703         struct chbk             *p_ch;
2704         struct ccwbk    *p_first_ccw;
2705 
2706         if (!dev) {
2707                 return;
2708         }
2709         privptr = (struct claw_privbk *)dev->ml_priv;
2710         p_ch = &privptr->channel[WRITE_CHANNEL];
2711 
2712         CLAW_DBF_TEXT(4, trace, "strt_io");
2713         p_first_ccw=privptr->p_write_active_first;
2714 
2715         if (p_ch->claw_state == CLAW_STOP)
2716                 return;
2717         if (p_first_ccw == NULL) {
2718                 return;
2719         }
2720         if (test_and_set_bit(0, (void *)&p_ch->IO_active) == 0) {
2721                 parm = (unsigned long) p_ch;
2722                 CLAW_DBF_TEXT(2, trace, "StWrtIO");
2723                 rc = ccw_device_start(p_ch->cdev, &p_first_ccw->write, parm,
2724                                       0xff, 0);
2725                 if (rc != 0) {
2726                         ccw_check_return_code(p_ch->cdev, rc);
2727                 }
2728         }
2729         dev->trans_start = jiffies;
2730         return;
2731 }       /*    end of claw_strt_out_IO    */
2732 
2733 /*-------------------------------------------------------------------*
2734 *       Free write buffers                                           *
2735 *                                                                    *
2736 *--------------------------------------------------------------------*/
2737 
2738 static void
2739 claw_free_wrt_buf( struct net_device *dev )
2740 {
2741 
2742         struct claw_privbk *privptr = (struct claw_privbk *)dev->ml_priv;
2743         struct ccwbk*p_this_ccw;
2744         struct ccwbk*p_next_ccw;
2745 
2746         CLAW_DBF_TEXT(4, trace, "freewrtb");
2747         /*  scan the write queue to free any completed write packets   */
2748         p_this_ccw=privptr->p_write_active_first;
2749         while ( (p_this_ccw!=NULL) && (p_this_ccw->header.flag!=CLAW_PENDING))
2750         {
2751                 p_next_ccw = p_this_ccw->next;
2752                 if (((p_next_ccw!=NULL) &&
2753                      (p_next_ccw->header.flag!=CLAW_PENDING)) ||
2754                     ((p_this_ccw == privptr->p_write_active_last) &&
2755                      (p_this_ccw->header.flag!=CLAW_PENDING))) {
2756                         /* The next CCW is OK or this is  */
2757                         /* the last CCW...free it   @A1A  */
2758                         privptr->p_write_active_first=p_this_ccw->next;
2759                         p_this_ccw->header.flag=CLAW_PENDING;
2760                         p_this_ccw->next=privptr->p_write_free_chain;
2761                         privptr->p_write_free_chain=p_this_ccw;
2762                         ++privptr->write_free_count;
2763                         privptr->stats.tx_bytes+= p_this_ccw->write.count;
2764                         p_this_ccw=privptr->p_write_active_first;
2765                         privptr->stats.tx_packets++;
2766                 }
2767                 else {
2768                         break;
2769                 }
2770         }
2771         if (privptr->write_free_count!=0) {
2772                 claw_clearbit_busy(TB_NOBUFFER,dev);
2773         }
2774         /*   whole chain removed?   */
2775         if (privptr->p_write_active_first==NULL) {
2776                 privptr->p_write_active_last=NULL;
2777         }
2778         CLAW_DBF_TEXT_(4, trace, "FWC=%d", privptr->write_free_count);
2779         return;
2780 }
2781 
2782 /*-------------------------------------------------------------------*
2783 *       claw free netdevice                                          *
2784 *                                                                    *
2785 *--------------------------------------------------------------------*/
2786 static void
2787 claw_free_netdevice(struct net_device * dev, int free_dev)
2788 {
2789         struct claw_privbk *privptr;
2790 
2791         CLAW_DBF_TEXT(2, setup, "free_dev");
2792         if (!dev)
2793                 return;
2794         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2795         privptr = dev->ml_priv;
2796         if (dev->flags & IFF_RUNNING)
2797                 claw_release(dev);
2798         if (privptr) {
2799                 privptr->channel[READ_CHANNEL].ndev = NULL;  /* say it's free */
2800         }
2801         dev->ml_priv = NULL;
2802 #ifdef MODULE
2803         if (free_dev) {
2804                 free_netdev(dev);
2805         }
2806 #endif
2807         CLAW_DBF_TEXT(2, setup, "free_ok");
2808 }
2809 
2810 /**
2811  * Claw init netdevice
2812  * Initialize everything of the net device except the name and the
2813  * channel structs.
2814  */
2815 static const struct net_device_ops claw_netdev_ops = {
2816         .ndo_open               = claw_open,
2817         .ndo_stop               = claw_release,
2818         .ndo_get_stats          = claw_stats,
2819         .ndo_start_xmit         = claw_tx,
2820         .ndo_change_mtu         = claw_change_mtu,
2821 };
2822 
2823 static void
2824 claw_init_netdevice(struct net_device * dev)
2825 {
2826         CLAW_DBF_TEXT(2, setup, "init_dev");
2827         CLAW_DBF_TEXT_(2, setup, "%s", dev->name);
2828         dev->mtu = CLAW_DEFAULT_MTU_SIZE;
2829         dev->hard_header_len = 0;
2830         dev->addr_len = 0;
2831         dev->type = ARPHRD_SLIP;
2832         dev->tx_queue_len = 1300;
2833         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
2834         dev->netdev_ops = &claw_netdev_ops;
2835         CLAW_DBF_TEXT(2, setup, "initok");
2836         return;
2837 }
2838 
2839 /**
2840  * Init a new channel in the privptr->channel[i].
2841  *
2842  * @param cdev  The ccw_device to be added.
2843  *
2844  * @return 0 on success, !0 on error.
2845  */
2846 static int
2847 add_channel(struct ccw_device *cdev,int i,struct claw_privbk *privptr)
2848 {
2849         struct chbk *p_ch;
2850         struct ccw_dev_id dev_id;
2851 
2852         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cdev->dev));
2853         privptr->channel[i].flag  = i+1;   /* Read is 1 Write is 2 */
2854         p_ch = &privptr->channel[i];
2855         p_ch->cdev = cdev;
2856         snprintf(p_ch->id, CLAW_ID_SIZE, "cl-%s", dev_name(&cdev->dev));
2857         ccw_device_get_id(cdev, &dev_id);
2858         p_ch->devno = dev_id.devno;
2859         if ((p_ch->irb = kzalloc(sizeof (struct irb),GFP_KERNEL)) == NULL) {
2860                 return -ENOMEM;
2861         }
2862         return 0;
2863 }
2864 
2865 
2866 /**
2867  *
2868  * Setup an interface.
2869  *
2870  * @param cgdev  Device to be setup.
2871  *
2872  * @returns 0 on success, !0 on failure.
2873  */
2874 static int
2875 claw_new_device(struct ccwgroup_device *cgdev)
2876 {
2877         struct claw_privbk *privptr;
2878         struct claw_env *p_env;
2879         struct net_device *dev;
2880         int ret;
2881         struct ccw_dev_id dev_id;
2882 
2883         dev_info(&cgdev->dev, "add for %s\n",
2884                  dev_name(&cgdev->cdev[READ_CHANNEL]->dev));
2885         CLAW_DBF_TEXT(2, setup, "new_dev");
2886         privptr = dev_get_drvdata(&cgdev->dev);
2887         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2888         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2889         if (!privptr)
2890                 return -ENODEV;
2891         p_env = privptr->p_env;
2892         ccw_device_get_id(cgdev->cdev[READ_CHANNEL], &dev_id);
2893         p_env->devno[READ_CHANNEL] = dev_id.devno;
2894         ccw_device_get_id(cgdev->cdev[WRITE_CHANNEL], &dev_id);
2895         p_env->devno[WRITE_CHANNEL] = dev_id.devno;
2896         ret = add_channel(cgdev->cdev[0],0,privptr);
2897         if (ret == 0)
2898                 ret = add_channel(cgdev->cdev[1],1,privptr);
2899         if (ret != 0) {
2900                 dev_warn(&cgdev->dev, "Creating a CLAW group device"
2901                         " failed with error code %d\n", ret);
2902                 goto out;
2903         }
2904         ret = ccw_device_set_online(cgdev->cdev[READ_CHANNEL]);
2905         if (ret != 0) {
2906                 dev_warn(&cgdev->dev,
2907                         "Setting the read subchannel online"
2908                         " failed with error code %d\n", ret);
2909                 goto out;
2910         }
2911         ret = ccw_device_set_online(cgdev->cdev[WRITE_CHANNEL]);
2912         if (ret != 0) {
2913                 dev_warn(&cgdev->dev,
2914                         "Setting the write subchannel online "
2915                         "failed with error code %d\n", ret);
2916                 goto out;
2917         }
2918         dev = alloc_netdev(0,"claw%d",claw_init_netdevice);
2919         if (!dev) {
2920                 dev_warn(&cgdev->dev,
2921                         "Activating the CLAW device failed\n");
2922                 goto out;
2923         }
2924         dev->ml_priv = privptr;
2925         dev_set_drvdata(&cgdev->dev, privptr);
2926         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, privptr);
2927         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, privptr);
2928         /* sysfs magic */
2929         SET_NETDEV_DEV(dev, &cgdev->dev);
2930         if (register_netdev(dev) != 0) {
2931                 claw_free_netdevice(dev, 1);
2932                 CLAW_DBF_TEXT(2, trace, "regfail");
2933                 goto out;
2934         }
2935         dev->flags &=~IFF_RUNNING;
2936         if (privptr->buffs_alloc == 0) {
2937                 ret=init_ccw_bk(dev);
2938                 if (ret !=0) {
2939                         unregister_netdev(dev);
2940                         claw_free_netdevice(dev,1);
2941                         CLAW_DBF_TEXT(2, trace, "ccwmem");
2942                         goto out;
2943                 }
2944         }
2945         privptr->channel[READ_CHANNEL].ndev = dev;
2946         privptr->channel[WRITE_CHANNEL].ndev = dev;
2947         privptr->p_env->ndev = dev;
2948 
2949         dev_info(&cgdev->dev, "%s:readsize=%d  writesize=%d "
2950                 "readbuffer=%d writebuffer=%d read=0x%04x write=0x%04x\n",
2951                 dev->name, p_env->read_size,
2952                 p_env->write_size, p_env->read_buffers,
2953                 p_env->write_buffers, p_env->devno[READ_CHANNEL],
2954                 p_env->devno[WRITE_CHANNEL]);
2955         dev_info(&cgdev->dev, "%s:host_name:%.8s, adapter_name "
2956                 ":%.8s api_type: %.8s\n",
2957                 dev->name, p_env->host_name,
2958                 p_env->adapter_name , p_env->api_type);
2959         return 0;
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 = 0;
2991 
2992         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
2993         priv = dev_get_drvdata(&cgdev->dev);
2994         if (!priv)
2995                 return -ENODEV;
2996         ndev = priv->channel[READ_CHANNEL].ndev;
2997         if (ndev) {
2998                 /* Close the device */
2999                 dev_info(&cgdev->dev, "%s: shutting down\n",
3000                         ndev->name);
3001                 if (ndev->flags & IFF_RUNNING)
3002                         ret = claw_release(ndev);
3003                 ndev->flags &=~IFF_RUNNING;
3004                 unregister_netdev(ndev);
3005                 ndev->ml_priv = NULL;  /* cgdev data, not ndev's to free */
3006                 claw_free_netdevice(ndev, 1);
3007                 priv->channel[READ_CHANNEL].ndev = NULL;
3008                 priv->channel[WRITE_CHANNEL].ndev = NULL;
3009                 priv->p_env->ndev = NULL;
3010         }
3011         ccw_device_set_offline(cgdev->cdev[1]);
3012         ccw_device_set_offline(cgdev->cdev[0]);
3013         return ret;
3014 }
3015 
3016 static void
3017 claw_remove_device(struct ccwgroup_device *cgdev)
3018 {
3019         struct claw_privbk *priv;
3020 
3021         CLAW_DBF_TEXT_(2, setup, "%s", dev_name(&cgdev->dev));
3022         priv = dev_get_drvdata(&cgdev->dev);
3023         dev_info(&cgdev->dev, " will be removed.\n");
3024         if (cgdev->state == CCWGROUP_ONLINE)
3025                 claw_shutdown_device(cgdev);
3026         kfree(priv->p_mtc_envelope);
3027         priv->p_mtc_envelope=NULL;
3028         kfree(priv->p_env);
3029         priv->p_env=NULL;
3030         kfree(priv->channel[0].irb);
3031         priv->channel[0].irb=NULL;
3032         kfree(priv->channel[1].irb);
3033         priv->channel[1].irb=NULL;
3034         kfree(priv);
3035         dev_set_drvdata(&cgdev->dev, NULL);
3036         dev_set_drvdata(&cgdev->cdev[READ_CHANNEL]->dev, NULL);
3037         dev_set_drvdata(&cgdev->cdev[WRITE_CHANNEL]->dev, NULL);
3038         put_device(&cgdev->dev);
3039 
3040         return;
3041 }
3042 
3043 
3044 /*
3045  * sysfs attributes
3046  */
3047 static ssize_t
3048 claw_hname_show(struct device *dev, struct device_attribute *attr, char *buf)
3049 {
3050         struct claw_privbk *priv;
3051         struct claw_env *  p_env;
3052 
3053         priv = dev_get_drvdata(dev);
3054         if (!priv)
3055                 return -ENODEV;
3056         p_env = priv->p_env;
3057         return sprintf(buf, "%s\n",p_env->host_name);
3058 }
3059 
3060 static ssize_t
3061 claw_hname_write(struct device *dev, struct device_attribute *attr,
3062          const char *buf, size_t count)
3063 {
3064         struct claw_privbk *priv;
3065         struct claw_env *  p_env;
3066 
3067         priv = dev_get_drvdata(dev);
3068         if (!priv)
3069                 return -ENODEV;
3070         p_env = priv->p_env;
3071         if (count > MAX_NAME_LEN+1)
3072                 return -EINVAL;
3073         memset(p_env->host_name, 0x20, MAX_NAME_LEN);
3074         strncpy(p_env->host_name,buf, count);
3075         p_env->host_name[count-1] = 0x20;  /* clear extra 0x0a */
3076         p_env->host_name[MAX_NAME_LEN] = 0x00;
3077         CLAW_DBF_TEXT(2, setup, "HstnSet");
3078         CLAW_DBF_TEXT_(2, setup, "%s", p_env->host_name);
3079 
3080         return count;
3081 }
3082 
3083 static DEVICE_ATTR(host_name, 0644, claw_hname_show, claw_hname_write);
3084 
3085 static ssize_t
3086 claw_adname_show(struct device *dev, struct device_attribute *attr, char *buf)
3087 {
3088         struct claw_privbk *priv;
3089         struct claw_env *  p_env;
3090 
3091         priv = dev_get_drvdata(dev);
3092         if (!priv)
3093                 return -ENODEV;
3094         p_env = priv->p_env;
3095         return sprintf(buf, "%s\n", p_env->adapter_name);
3096 }
3097 
3098 static ssize_t
3099 claw_adname_write(struct device *dev, struct device_attribute *attr,
3100          const char *buf, size_t count)
3101 {
3102         struct claw_privbk *priv;
3103         struct claw_env *  p_env;
3104 
3105         priv = dev_get_drvdata(dev);
3106         if (!priv)
3107                 return -ENODEV;
3108         p_env = priv->p_env;
3109         if (count > MAX_NAME_LEN+1)
3110                 return -EINVAL;
3111         memset(p_env->adapter_name, 0x20, MAX_NAME_LEN);
3112         strncpy(p_env->adapter_name,buf, count);
3113         p_env->adapter_name[count-1] = 0x20; /* clear extra 0x0a */
3114         p_env->adapter_name[MAX_NAME_LEN] = 0x00;
3115         CLAW_DBF_TEXT(2, setup, "AdnSet");
3116         CLAW_DBF_TEXT_(2, setup, "%s", p_env->adapter_name);
3117 
3118         return count;
3119 }
3120 
3121 static DEVICE_ATTR(adapter_name, 0644, claw_adname_show, claw_adname_write);
3122 
3123 static ssize_t
3124 claw_apname_show(struct device *dev, struct device_attribute *attr, char *buf)
3125 {
3126         struct claw_privbk *priv;
3127         struct claw_env *  p_env;
3128 
3129         priv = dev_get_drvdata(dev);
3130         if (!priv)
3131                 return -ENODEV;
3132         p_env = priv->p_env;
3133         return sprintf(buf, "%s\n",
3134                        p_env->api_type);
3135 }
3136 
3137 static ssize_t
3138 claw_apname_write(struct device *dev, struct device_attribute *attr,
3139         const char *buf, size_t count)
3140 {
3141         struct claw_privbk *priv;
3142         struct claw_env *  p_env;
3143 
3144         priv = dev_get_drvdata(dev);
3145         if (!priv)
3146                 return -ENODEV;
3147         p_env = priv->p_env;
3148         if (count > MAX_NAME_LEN+1)
3149                 return -EINVAL;
3150         memset(p_env->api_type, 0x20, MAX_NAME_LEN);
3151         strncpy(p_env->api_type,buf, count);
3152         p_env->api_type[count-1] = 0x20;  /* we get a loose 0x0a */
3153         p_env->api_type[MAX_NAME_LEN] = 0x00;
3154         if(strncmp(p_env->api_type,WS_APPL_NAME_PACKED,6) == 0) {
3155                 p_env->read_size=DEF_PACK_BUFSIZE;
3156                 p_env->write_size=DEF_PACK_BUFSIZE;
3157                 p_env->packing=PACKING_ASK;
3158                 CLAW_DBF_TEXT(2, setup, "PACKING");
3159         }
3160         else {
3161                 p_env->packing=0;
3162                 p_env->read_size=CLAW_FRAME_SIZE;
3163                 p_env->write_size=CLAW_FRAME_SIZE;
3164                 CLAW_DBF_TEXT(2, setup, "ApiSet");
3165         }
3166         CLAW_DBF_TEXT_(2, setup, "%s", p_env->api_type);
3167         return count;
3168 }
3169 
3170 static DEVICE_ATTR(api_type, 0644, claw_apname_show, claw_apname_write);
3171 
3172 static ssize_t
3173 claw_wbuff_show(struct device *dev, struct device_attribute *attr, char *buf)
3174 {
3175         struct claw_privbk *priv;
3176         struct claw_env * p_env;
3177 
3178         priv = dev_get_drvdata(dev);
3179         if (!priv)
3180                 return -ENODEV;
3181         p_env = priv->p_env;
3182         return sprintf(buf, "%d\n", p_env->write_buffers);
3183 }
3184 
3185 static ssize_t
3186 claw_wbuff_write(struct device *dev, struct device_attribute *attr,
3187         const char *buf, size_t count)
3188 {
3189         struct claw_privbk *priv;
3190         struct claw_env *  p_env;
3191         int nnn,max;
3192 
3193         priv = dev_get_drvdata(dev);
3194         if (!priv)
3195                 return -ENODEV;
3196         p_env = priv->p_env;
3197         sscanf(buf, "%i", &nnn);
3198         if (p_env->packing) {
3199                 max = 64;
3200         }
3201         else {
3202                 max = 512;
3203         }
3204         if ((nnn > max ) || (nnn < 2))
3205                 return -EINVAL;
3206         p_env->write_buffers = nnn;
3207         CLAW_DBF_TEXT(2, setup, "Wbufset");
3208         CLAW_DBF_TEXT_(2, setup, "WB=%d", p_env->write_buffers);
3209         return count;
3210 }
3211 
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_get_drvdata(dev);
3221         if (!priv)
3222                 return -ENODEV;
3223         p_env = priv->p_env;
3224         return sprintf(buf, "%d\n", p_env->read_buffers);
3225 }
3226 
3227 static ssize_t
3228 claw_rbuff_write(struct device *dev, struct device_attribute *attr,
3229         const char *buf, size_t count)
3230 {
3231         struct claw_privbk *priv;
3232         struct claw_env *p_env;
3233         int nnn,max;
3234 
3235         priv = dev_get_drvdata(dev);
3236         if (!priv)
3237                 return -ENODEV;
3238         p_env = priv->p_env;
3239         sscanf(buf, "%i", &nnn);
3240         if (p_env->packing) {
3241                 max = 64;
3242         }
3243         else {
3244                 max = 512;
3245         }
3246         if ((nnn > max ) || (nnn < 2))
3247                 return -EINVAL;
3248         p_env->read_buffers = nnn;
3249         CLAW_DBF_TEXT(2, setup, "Rbufset");
3250         CLAW_DBF_TEXT_(2, setup, "RB=%d", p_env->read_buffers);
3251         return count;
3252 }
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 static struct attribute_group claw_attr_group = {
3264         .attrs = claw_attr,
3265 };
3266 static const struct attribute_group *claw_attr_groups[] = {
3267         &claw_attr_group,
3268         NULL,
3269 };
3270 static const struct device_type claw_devtype = {
3271         .name = "claw",
3272         .groups = claw_attr_groups,
3273 };
3274 
3275 /*----------------------------------------------------------------*
3276  *   claw_probe                                                   *
3277  *      this function is called for each CLAW device.             *
3278  *----------------------------------------------------------------*/
3279 static int claw_probe(struct ccwgroup_device *cgdev)
3280 {
3281         struct claw_privbk *privptr = NULL;
3282 
3283         CLAW_DBF_TEXT(2, setup, "probe");
3284         if (!get_device(&cgdev->dev))
3285                 return -ENODEV;
3286         privptr = kzalloc(sizeof(struct claw_privbk), GFP_KERNEL);
3287         dev_set_drvdata(&cgdev->dev, privptr);
3288         if (privptr == NULL) {
3289                 probe_error(cgdev);
3290                 put_device(&cgdev->dev);
3291                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3292                 return -ENOMEM;
3293         }
3294         privptr->p_mtc_envelope = kzalloc(MAX_ENVELOPE_SIZE, GFP_KERNEL);
3295         privptr->p_env = kzalloc(sizeof(struct claw_env), GFP_KERNEL);
3296         if ((privptr->p_mtc_envelope == NULL) || (privptr->p_env == NULL)) {
3297                 probe_error(cgdev);
3298                 put_device(&cgdev->dev);
3299                 CLAW_DBF_TEXT_(2, setup, "probex%d", -ENOMEM);
3300                 return -ENOMEM;
3301         }
3302         memcpy(privptr->p_env->adapter_name, WS_NAME_NOT_DEF, 8);
3303         memcpy(privptr->p_env->host_name, WS_NAME_NOT_DEF, 8);
3304         memcpy(privptr->p_env->api_type, WS_NAME_NOT_DEF, 8);
3305         privptr->p_env->packing = 0;
3306         privptr->p_env->write_buffers = 5;
3307         privptr->p_env->read_buffers = 5;
3308         privptr->p_env->read_size = CLAW_FRAME_SIZE;
3309         privptr->p_env->write_size = CLAW_FRAME_SIZE;
3310         privptr->p_env->p_priv = privptr;
3311         cgdev->cdev[0]->handler = claw_irq_handler;
3312         cgdev->cdev[1]->handler = claw_irq_handler;
3313         cgdev->dev.type = &claw_devtype;
3314         CLAW_DBF_TEXT(2, setup, "prbext 0");
3315 
3316         return 0;
3317 }  /*  end of claw_probe       */
3318 
3319 /*--------------------------------------------------------------------*
3320 *    claw_init  and cleanup                                           *
3321 *---------------------------------------------------------------------*/
3322 
3323 static void __exit claw_cleanup(void)
3324 {
3325         ccwgroup_driver_unregister(&claw_group_driver);
3326         ccw_driver_unregister(&claw_ccw_driver);
3327         root_device_unregister(claw_root_dev);
3328         claw_unregister_debug_facility();
3329         pr_info("Driver unloaded\n");
3330 }
3331 
3332 /**
3333  * Initialize module.
3334  * This is called just after the module is loaded.
3335  *
3336  * @return 0 on success, !0 on error.
3337  */
3338 static int __init claw_init(void)
3339 {
3340         int ret = 0;
3341 
3342         pr_info("Loading %s\n", version);
3343         ret = claw_register_debug_facility();
3344         if (ret) {
3345                 pr_err("Registering with the S/390 debug feature"
3346                         " failed with error code %d\n", ret);
3347                 goto out_err;
3348         }
3349         CLAW_DBF_TEXT(2, setup, "init_mod");
3350         claw_root_dev = root_device_register("claw");
3351         ret = PTR_ERR_OR_ZERO(claw_root_dev);
3352         if (ret)
3353                 goto register_err;
3354         ret = ccw_driver_register(&claw_ccw_driver);
3355         if (ret)
3356                 goto ccw_err;
3357         claw_group_driver.driver.groups = claw_drv_attr_groups;
3358         ret = ccwgroup_driver_register(&claw_group_driver);
3359         if (ret)
3360                 goto ccwgroup_err;
3361         return 0;
3362 
3363 ccwgroup_err:
3364         ccw_driver_unregister(&claw_ccw_driver);
3365 ccw_err:
3366         root_device_unregister(claw_root_dev);
3367 register_err:
3368         CLAW_DBF_TEXT(2, setup, "init_bad");
3369         claw_unregister_debug_facility();
3370 out_err:
3371         pr_err("Initializing the claw device driver failed\n");
3372         return ret;
3373 }
3374 
3375 module_init(claw_init);
3376 module_exit(claw_cleanup);
3377 
3378 MODULE_AUTHOR("Andy Richter <richtera@us.ibm.com>");
3379 MODULE_DESCRIPTION("Linux for System z CLAW Driver\n" \
3380                         "Copyright IBM Corp. 2000, 2008\n");
3381 MODULE_LICENSE("GPL");
3382 

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