[S390] lcs: add support for irq statistics
[linux-2.6.git] / drivers / s390 / net / lcs.c
1 /*
2  *  Linux for S/390 Lan Channel Station Network Driver
3  *
4  *  Copyright IBM Corp. 1999, 2009
5  *  Author(s): Original Code written by
6  *                      DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7  *             Rewritten by
8  *                      Frank Pavlic <fpavlic@de.ibm.com> and
9  *                      Martin Schwidefsky <schwidefsky@de.ibm.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2, or (at your option)
14  * any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  */
25
26 #define KMSG_COMPONENT          "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/kernel_stat.h>
30 #include <linux/module.h>
31 #include <linux/if.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/trdevice.h>
35 #include <linux/fddidevice.h>
36 #include <linux/inetdevice.h>
37 #include <linux/in.h>
38 #include <linux/igmp.h>
39 #include <linux/delay.h>
40 #include <linux/kthread.h>
41 #include <linux/slab.h>
42 #include <net/arp.h>
43 #include <net/ip.h>
44
45 #include <asm/debug.h>
46 #include <asm/idals.h>
47 #include <asm/timex.h>
48 #include <linux/device.h>
49 #include <asm/ccwgroup.h>
50
51 #include "lcs.h"
52
53
54 #if !defined(CONFIG_NET_ETHERNET) && \
55     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
56 #error Cannot compile lcs.c without some net devices switched on.
57 #endif
58
59 /**
60  * initialization string for output
61  */
62
63 static char version[] __initdata = "LCS driver";
64
65 /**
66   * the root device for lcs group devices
67   */
68 static struct device *lcs_root_dev;
69
70 /**
71  * Some prototypes.
72  */
73 static void lcs_tasklet(unsigned long);
74 static void lcs_start_kernel_thread(struct work_struct *);
75 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
76 #ifdef CONFIG_IP_MULTICAST
77 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
78 #endif /* CONFIG_IP_MULTICAST */
79 static int lcs_recovery(void *ptr);
80
81 /**
82  * Debug Facility Stuff
83  */
84 static char debug_buffer[255];
85 static debug_info_t *lcs_dbf_setup;
86 static debug_info_t *lcs_dbf_trace;
87
88 /**
89  *  LCS Debug Facility functions
90  */
91 static void
92 lcs_unregister_debug_facility(void)
93 {
94         if (lcs_dbf_setup)
95                 debug_unregister(lcs_dbf_setup);
96         if (lcs_dbf_trace)
97                 debug_unregister(lcs_dbf_trace);
98 }
99
100 static int
101 lcs_register_debug_facility(void)
102 {
103         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
104         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
105         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
106                 pr_err("Not enough memory for debug facility.\n");
107                 lcs_unregister_debug_facility();
108                 return -ENOMEM;
109         }
110         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
111         debug_set_level(lcs_dbf_setup, 2);
112         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
113         debug_set_level(lcs_dbf_trace, 2);
114         return 0;
115 }
116
117 /**
118  * Allocate io buffers.
119  */
120 static int
121 lcs_alloc_channel(struct lcs_channel *channel)
122 {
123         int cnt;
124
125         LCS_DBF_TEXT(2, setup, "ichalloc");
126         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
127                 /* alloc memory fo iobuffer */
128                 channel->iob[cnt].data =
129                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
130                 if (channel->iob[cnt].data == NULL)
131                         break;
132                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
133         }
134         if (cnt < LCS_NUM_BUFFS) {
135                 /* Not all io buffers could be allocated. */
136                 LCS_DBF_TEXT(2, setup, "echalloc");
137                 while (cnt-- > 0)
138                         kfree(channel->iob[cnt].data);
139                 return -ENOMEM;
140         }
141         return 0;
142 }
143
144 /**
145  * Free io buffers.
146  */
147 static void
148 lcs_free_channel(struct lcs_channel *channel)
149 {
150         int cnt;
151
152         LCS_DBF_TEXT(2, setup, "ichfree");
153         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
154                 kfree(channel->iob[cnt].data);
155                 channel->iob[cnt].data = NULL;
156         }
157 }
158
159 /*
160  * Cleanup channel.
161  */
162 static void
163 lcs_cleanup_channel(struct lcs_channel *channel)
164 {
165         LCS_DBF_TEXT(3, setup, "cleanch");
166         /* Kill write channel tasklets. */
167         tasklet_kill(&channel->irq_tasklet);
168         /* Free channel buffers. */
169         lcs_free_channel(channel);
170 }
171
172 /**
173  * LCS free memory for card and channels.
174  */
175 static void
176 lcs_free_card(struct lcs_card *card)
177 {
178         LCS_DBF_TEXT(2, setup, "remcard");
179         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
180         kfree(card);
181 }
182
183 /**
184  * LCS alloc memory for card and channels
185  */
186 static struct lcs_card *
187 lcs_alloc_card(void)
188 {
189         struct lcs_card *card;
190         int rc;
191
192         LCS_DBF_TEXT(2, setup, "alloclcs");
193
194         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
195         if (card == NULL)
196                 return NULL;
197         card->lan_type = LCS_FRAME_TYPE_AUTO;
198         card->pkt_seq = 0;
199         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
200         /* Allocate io buffers for the read channel. */
201         rc = lcs_alloc_channel(&card->read);
202         if (rc){
203                 LCS_DBF_TEXT(2, setup, "iccwerr");
204                 lcs_free_card(card);
205                 return NULL;
206         }
207         /* Allocate io buffers for the write channel. */
208         rc = lcs_alloc_channel(&card->write);
209         if (rc) {
210                 LCS_DBF_TEXT(2, setup, "iccwerr");
211                 lcs_cleanup_channel(&card->read);
212                 lcs_free_card(card);
213                 return NULL;
214         }
215
216 #ifdef CONFIG_IP_MULTICAST
217         INIT_LIST_HEAD(&card->ipm_list);
218 #endif
219         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
220         return card;
221 }
222
223 /*
224  * Setup read channel.
225  */
226 static void
227 lcs_setup_read_ccws(struct lcs_card *card)
228 {
229         int cnt;
230
231         LCS_DBF_TEXT(2, setup, "ireadccw");
232         /* Setup read ccws. */
233         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
234         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
235                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
236                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
237                 card->read.ccws[cnt].flags =
238                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
239                 /*
240                  * Note: we have allocated the buffer with GFP_DMA, so
241                  * we do not need to do set_normalized_cda.
242                  */
243                 card->read.ccws[cnt].cda =
244                         (__u32) __pa(card->read.iob[cnt].data);
245                 ((struct lcs_header *)
246                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
247                 card->read.iob[cnt].callback = lcs_get_frames_cb;
248                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
249                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
250         }
251         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
252         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
253         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
254         /* Last ccw is a tic (transfer in channel). */
255         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
256         card->read.ccws[LCS_NUM_BUFFS].cda =
257                 (__u32) __pa(card->read.ccws);
258         /* Setg initial state of the read channel. */
259         card->read.state = LCS_CH_STATE_INIT;
260
261         card->read.io_idx = 0;
262         card->read.buf_idx = 0;
263 }
264
265 static void
266 lcs_setup_read(struct lcs_card *card)
267 {
268         LCS_DBF_TEXT(3, setup, "initread");
269
270         lcs_setup_read_ccws(card);
271         /* Initialize read channel tasklet. */
272         card->read.irq_tasklet.data = (unsigned long) &card->read;
273         card->read.irq_tasklet.func = lcs_tasklet;
274         /* Initialize waitqueue. */
275         init_waitqueue_head(&card->read.wait_q);
276 }
277
278 /*
279  * Setup write channel.
280  */
281 static void
282 lcs_setup_write_ccws(struct lcs_card *card)
283 {
284         int cnt;
285
286         LCS_DBF_TEXT(3, setup, "iwritccw");
287         /* Setup write ccws. */
288         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
289         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
290                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
291                 card->write.ccws[cnt].count = 0;
292                 card->write.ccws[cnt].flags =
293                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
294                 /*
295                  * Note: we have allocated the buffer with GFP_DMA, so
296                  * we do not need to do set_normalized_cda.
297                  */
298                 card->write.ccws[cnt].cda =
299                         (__u32) __pa(card->write.iob[cnt].data);
300         }
301         /* Last ccw is a tic (transfer in channel). */
302         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
303         card->write.ccws[LCS_NUM_BUFFS].cda =
304                 (__u32) __pa(card->write.ccws);
305         /* Set initial state of the write channel. */
306         card->read.state = LCS_CH_STATE_INIT;
307
308         card->write.io_idx = 0;
309         card->write.buf_idx = 0;
310 }
311
312 static void
313 lcs_setup_write(struct lcs_card *card)
314 {
315         LCS_DBF_TEXT(3, setup, "initwrit");
316
317         lcs_setup_write_ccws(card);
318         /* Initialize write channel tasklet. */
319         card->write.irq_tasklet.data = (unsigned long) &card->write;
320         card->write.irq_tasklet.func = lcs_tasklet;
321         /* Initialize waitqueue. */
322         init_waitqueue_head(&card->write.wait_q);
323 }
324
325 static void
326 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
327 {
328         unsigned long flags;
329
330         spin_lock_irqsave(&card->mask_lock, flags);
331         card->thread_allowed_mask = threads;
332         spin_unlock_irqrestore(&card->mask_lock, flags);
333         wake_up(&card->wait_q);
334 }
335 static inline int
336 lcs_threads_running(struct lcs_card *card, unsigned long threads)
337 {
338         unsigned long flags;
339         int rc = 0;
340
341         spin_lock_irqsave(&card->mask_lock, flags);
342         rc = (card->thread_running_mask & threads);
343         spin_unlock_irqrestore(&card->mask_lock, flags);
344         return rc;
345 }
346
347 static int
348 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
349 {
350         return wait_event_interruptible(card->wait_q,
351                         lcs_threads_running(card, threads) == 0);
352 }
353
354 static inline int
355 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
356 {
357         unsigned long flags;
358
359         spin_lock_irqsave(&card->mask_lock, flags);
360         if ( !(card->thread_allowed_mask & thread) ||
361               (card->thread_start_mask & thread) ) {
362                 spin_unlock_irqrestore(&card->mask_lock, flags);
363                 return -EPERM;
364         }
365         card->thread_start_mask |= thread;
366         spin_unlock_irqrestore(&card->mask_lock, flags);
367         return 0;
368 }
369
370 static void
371 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
372 {
373         unsigned long flags;
374
375         spin_lock_irqsave(&card->mask_lock, flags);
376         card->thread_running_mask &= ~thread;
377         spin_unlock_irqrestore(&card->mask_lock, flags);
378         wake_up(&card->wait_q);
379 }
380
381 static inline int
382 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
383 {
384         unsigned long flags;
385         int rc = 0;
386
387         spin_lock_irqsave(&card->mask_lock, flags);
388         if (card->thread_start_mask & thread){
389                 if ((card->thread_allowed_mask & thread) &&
390                     !(card->thread_running_mask & thread)){
391                         rc = 1;
392                         card->thread_start_mask &= ~thread;
393                         card->thread_running_mask |= thread;
394                 } else
395                         rc = -EPERM;
396         }
397         spin_unlock_irqrestore(&card->mask_lock, flags);
398         return rc;
399 }
400
401 static int
402 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
403 {
404         int rc = 0;
405         wait_event(card->wait_q,
406                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
407         return rc;
408 }
409
410 static int
411 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
412 {
413         unsigned long flags;
414         int rc = 0;
415
416         spin_lock_irqsave(&card->mask_lock, flags);
417         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
418                         (u8) card->thread_start_mask,
419                         (u8) card->thread_allowed_mask,
420                         (u8) card->thread_running_mask);
421         rc = (card->thread_start_mask & thread);
422         spin_unlock_irqrestore(&card->mask_lock, flags);
423         return rc;
424 }
425
426 /**
427  * Initialize channels,card and state machines.
428  */
429 static void
430 lcs_setup_card(struct lcs_card *card)
431 {
432         LCS_DBF_TEXT(2, setup, "initcard");
433         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
434
435         lcs_setup_read(card);
436         lcs_setup_write(card);
437         /* Set cards initial state. */
438         card->state = DEV_STATE_DOWN;
439         card->tx_buffer = NULL;
440         card->tx_emitted = 0;
441
442         init_waitqueue_head(&card->wait_q);
443         spin_lock_init(&card->lock);
444         spin_lock_init(&card->ipm_lock);
445         spin_lock_init(&card->mask_lock);
446 #ifdef CONFIG_IP_MULTICAST
447         INIT_LIST_HEAD(&card->ipm_list);
448 #endif
449         INIT_LIST_HEAD(&card->lancmd_waiters);
450 }
451
452 static inline void
453 lcs_clear_multicast_list(struct lcs_card *card)
454 {
455 #ifdef  CONFIG_IP_MULTICAST
456         struct lcs_ipm_list *ipm;
457         unsigned long flags;
458
459         /* Free multicast list. */
460         LCS_DBF_TEXT(3, setup, "clmclist");
461         spin_lock_irqsave(&card->ipm_lock, flags);
462         while (!list_empty(&card->ipm_list)){
463                 ipm = list_entry(card->ipm_list.next,
464                                  struct lcs_ipm_list, list);
465                 list_del(&ipm->list);
466                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
467                         spin_unlock_irqrestore(&card->ipm_lock, flags);
468                         lcs_send_delipm(card, ipm);
469                         spin_lock_irqsave(&card->ipm_lock, flags);
470                 }
471                 kfree(ipm);
472         }
473         spin_unlock_irqrestore(&card->ipm_lock, flags);
474 #endif
475 }
476 /**
477  * Cleanup channels,card and state machines.
478  */
479 static void
480 lcs_cleanup_card(struct lcs_card *card)
481 {
482
483         LCS_DBF_TEXT(3, setup, "cleancrd");
484         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
485
486         if (card->dev != NULL)
487                 free_netdev(card->dev);
488         /* Cleanup channels. */
489         lcs_cleanup_channel(&card->write);
490         lcs_cleanup_channel(&card->read);
491 }
492
493 /**
494  * Start channel.
495  */
496 static int
497 lcs_start_channel(struct lcs_channel *channel)
498 {
499         unsigned long flags;
500         int rc;
501
502         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
503         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
504         rc = ccw_device_start(channel->ccwdev,
505                               channel->ccws + channel->io_idx, 0, 0,
506                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
507         if (rc == 0)
508                 channel->state = LCS_CH_STATE_RUNNING;
509         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
510         if (rc) {
511                 LCS_DBF_TEXT_(4,trace,"essh%s",
512                               dev_name(&channel->ccwdev->dev));
513                 dev_err(&channel->ccwdev->dev,
514                         "Starting an LCS device resulted in an error,"
515                         " rc=%d!\n", rc);
516         }
517         return rc;
518 }
519
520 static int
521 lcs_clear_channel(struct lcs_channel *channel)
522 {
523         unsigned long flags;
524         int rc;
525
526         LCS_DBF_TEXT(4,trace,"clearch");
527         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
528         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
529         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
530         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
531         if (rc) {
532                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
533                               dev_name(&channel->ccwdev->dev));
534                 return rc;
535         }
536         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
537         channel->state = LCS_CH_STATE_STOPPED;
538         return rc;
539 }
540
541
542 /**
543  * Stop channel.
544  */
545 static int
546 lcs_stop_channel(struct lcs_channel *channel)
547 {
548         unsigned long flags;
549         int rc;
550
551         if (channel->state == LCS_CH_STATE_STOPPED)
552                 return 0;
553         LCS_DBF_TEXT(4,trace,"haltsch");
554         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
555         channel->state = LCS_CH_STATE_INIT;
556         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
557         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
558         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
559         if (rc) {
560                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
561                               dev_name(&channel->ccwdev->dev));
562                 return rc;
563         }
564         /* Asynchronous halt initialted. Wait for its completion. */
565         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
566         lcs_clear_channel(channel);
567         return 0;
568 }
569
570 /**
571  * start read and write channel
572  */
573 static int
574 lcs_start_channels(struct lcs_card *card)
575 {
576         int rc;
577
578         LCS_DBF_TEXT(2, trace, "chstart");
579         /* start read channel */
580         rc = lcs_start_channel(&card->read);
581         if (rc)
582                 return rc;
583         /* start write channel */
584         rc = lcs_start_channel(&card->write);
585         if (rc)
586                 lcs_stop_channel(&card->read);
587         return rc;
588 }
589
590 /**
591  * stop read and write channel
592  */
593 static int
594 lcs_stop_channels(struct lcs_card *card)
595 {
596         LCS_DBF_TEXT(2, trace, "chhalt");
597         lcs_stop_channel(&card->read);
598         lcs_stop_channel(&card->write);
599         return 0;
600 }
601
602 /**
603  * Get empty buffer.
604  */
605 static struct lcs_buffer *
606 __lcs_get_buffer(struct lcs_channel *channel)
607 {
608         int index;
609
610         LCS_DBF_TEXT(5, trace, "_getbuff");
611         index = channel->io_idx;
612         do {
613                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
614                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
615                         return channel->iob + index;
616                 }
617                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
618         } while (index != channel->io_idx);
619         return NULL;
620 }
621
622 static struct lcs_buffer *
623 lcs_get_buffer(struct lcs_channel *channel)
624 {
625         struct lcs_buffer *buffer;
626         unsigned long flags;
627
628         LCS_DBF_TEXT(5, trace, "getbuff");
629         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
630         buffer = __lcs_get_buffer(channel);
631         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
632         return buffer;
633 }
634
635 /**
636  * Resume channel program if the channel is suspended.
637  */
638 static int
639 __lcs_resume_channel(struct lcs_channel *channel)
640 {
641         int rc;
642
643         if (channel->state != LCS_CH_STATE_SUSPENDED)
644                 return 0;
645         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
646                 return 0;
647         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
648         rc = ccw_device_resume(channel->ccwdev);
649         if (rc) {
650                 LCS_DBF_TEXT_(4, trace, "ersc%s",
651                               dev_name(&channel->ccwdev->dev));
652                 dev_err(&channel->ccwdev->dev,
653                         "Sending data from the LCS device to the LAN failed"
654                         " with rc=%d\n",rc);
655         } else
656                 channel->state = LCS_CH_STATE_RUNNING;
657         return rc;
658
659 }
660
661 /**
662  * Make a buffer ready for processing.
663  */
664 static inline void
665 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
666 {
667         int prev, next;
668
669         LCS_DBF_TEXT(5, trace, "rdybits");
670         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
671         next = (index + 1) & (LCS_NUM_BUFFS - 1);
672         /* Check if we may clear the suspend bit of this buffer. */
673         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
674                 /* Check if we have to set the PCI bit. */
675                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
676                         /* Suspend bit of the previous buffer is not set. */
677                         channel->ccws[index].flags |= CCW_FLAG_PCI;
678                 /* Suspend bit of the next buffer is set. */
679                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
680         }
681 }
682
683 static int
684 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
685 {
686         unsigned long flags;
687         int index, rc;
688
689         LCS_DBF_TEXT(5, trace, "rdybuff");
690         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
691                buffer->state != LCS_BUF_STATE_PROCESSED);
692         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
693         buffer->state = LCS_BUF_STATE_READY;
694         index = buffer - channel->iob;
695         /* Set length. */
696         channel->ccws[index].count = buffer->count;
697         /* Check relevant PCI/suspend bits. */
698         __lcs_ready_buffer_bits(channel, index);
699         rc = __lcs_resume_channel(channel);
700         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
701         return rc;
702 }
703
704 /**
705  * Mark the buffer as processed. Take care of the suspend bit
706  * of the previous buffer. This function is called from
707  * interrupt context, so the lock must not be taken.
708  */
709 static int
710 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
711 {
712         int index, prev, next;
713
714         LCS_DBF_TEXT(5, trace, "prcsbuff");
715         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
716         buffer->state = LCS_BUF_STATE_PROCESSED;
717         index = buffer - channel->iob;
718         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
719         next = (index + 1) & (LCS_NUM_BUFFS - 1);
720         /* Set the suspend bit and clear the PCI bit of this buffer. */
721         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
722         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
723         /* Check the suspend bit of the previous buffer. */
724         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
725                 /*
726                  * Previous buffer is in state ready. It might have
727                  * happened in lcs_ready_buffer that the suspend bit
728                  * has not been cleared to avoid an endless loop.
729                  * Do it now.
730                  */
731                 __lcs_ready_buffer_bits(channel, prev);
732         }
733         /* Clear PCI bit of next buffer. */
734         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
735         return __lcs_resume_channel(channel);
736 }
737
738 /**
739  * Put a processed buffer back to state empty.
740  */
741 static void
742 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
743 {
744         unsigned long flags;
745
746         LCS_DBF_TEXT(5, trace, "relbuff");
747         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
748                buffer->state != LCS_BUF_STATE_PROCESSED);
749         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
750         buffer->state = LCS_BUF_STATE_EMPTY;
751         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
752 }
753
754 /**
755  * Get buffer for a lan command.
756  */
757 static struct lcs_buffer *
758 lcs_get_lancmd(struct lcs_card *card, int count)
759 {
760         struct lcs_buffer *buffer;
761         struct lcs_cmd *cmd;
762
763         LCS_DBF_TEXT(4, trace, "getlncmd");
764         /* Get buffer and wait if none is available. */
765         wait_event(card->write.wait_q,
766                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
767         count += sizeof(struct lcs_header);
768         *(__u16 *)(buffer->data + count) = 0;
769         buffer->count = count + sizeof(__u16);
770         buffer->callback = lcs_release_buffer;
771         cmd = (struct lcs_cmd *) buffer->data;
772         cmd->offset = count;
773         cmd->type = LCS_FRAME_TYPE_CONTROL;
774         cmd->slot = 0;
775         return buffer;
776 }
777
778
779 static void
780 lcs_get_reply(struct lcs_reply *reply)
781 {
782         WARN_ON(atomic_read(&reply->refcnt) <= 0);
783         atomic_inc(&reply->refcnt);
784 }
785
786 static void
787 lcs_put_reply(struct lcs_reply *reply)
788 {
789         WARN_ON(atomic_read(&reply->refcnt) <= 0);
790         if (atomic_dec_and_test(&reply->refcnt)) {
791                 kfree(reply);
792         }
793
794 }
795
796 static struct lcs_reply *
797 lcs_alloc_reply(struct lcs_cmd *cmd)
798 {
799         struct lcs_reply *reply;
800
801         LCS_DBF_TEXT(4, trace, "getreply");
802
803         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
804         if (!reply)
805                 return NULL;
806         atomic_set(&reply->refcnt,1);
807         reply->sequence_no = cmd->sequence_no;
808         reply->received = 0;
809         reply->rc = 0;
810         init_waitqueue_head(&reply->wait_q);
811
812         return reply;
813 }
814
815 /**
816  * Notifier function for lancmd replies. Called from read irq.
817  */
818 static void
819 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
820 {
821         struct list_head *l, *n;
822         struct lcs_reply *reply;
823
824         LCS_DBF_TEXT(4, trace, "notiwait");
825         spin_lock(&card->lock);
826         list_for_each_safe(l, n, &card->lancmd_waiters) {
827                 reply = list_entry(l, struct lcs_reply, list);
828                 if (reply->sequence_no == cmd->sequence_no) {
829                         lcs_get_reply(reply);
830                         list_del_init(&reply->list);
831                         if (reply->callback != NULL)
832                                 reply->callback(card, cmd);
833                         reply->received = 1;
834                         reply->rc = cmd->return_code;
835                         wake_up(&reply->wait_q);
836                         lcs_put_reply(reply);
837                         break;
838                 }
839         }
840         spin_unlock(&card->lock);
841 }
842
843 /**
844  * Emit buffer of a lan comand.
845  */
846 static void
847 lcs_lancmd_timeout(unsigned long data)
848 {
849         struct lcs_reply *reply, *list_reply, *r;
850         unsigned long flags;
851
852         LCS_DBF_TEXT(4, trace, "timeout");
853         reply = (struct lcs_reply *) data;
854         spin_lock_irqsave(&reply->card->lock, flags);
855         list_for_each_entry_safe(list_reply, r,
856                                  &reply->card->lancmd_waiters,list) {
857                 if (reply == list_reply) {
858                         lcs_get_reply(reply);
859                         list_del_init(&reply->list);
860                         spin_unlock_irqrestore(&reply->card->lock, flags);
861                         reply->received = 1;
862                         reply->rc = -ETIME;
863                         wake_up(&reply->wait_q);
864                         lcs_put_reply(reply);
865                         return;
866                 }
867         }
868         spin_unlock_irqrestore(&reply->card->lock, flags);
869 }
870
871 static int
872 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
873                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
874 {
875         struct lcs_reply *reply;
876         struct lcs_cmd *cmd;
877         struct timer_list timer;
878         unsigned long flags;
879         int rc;
880
881         LCS_DBF_TEXT(4, trace, "sendcmd");
882         cmd = (struct lcs_cmd *) buffer->data;
883         cmd->return_code = 0;
884         cmd->sequence_no = card->sequence_no++;
885         reply = lcs_alloc_reply(cmd);
886         if (!reply)
887                 return -ENOMEM;
888         reply->callback = reply_callback;
889         reply->card = card;
890         spin_lock_irqsave(&card->lock, flags);
891         list_add_tail(&reply->list, &card->lancmd_waiters);
892         spin_unlock_irqrestore(&card->lock, flags);
893
894         buffer->callback = lcs_release_buffer;
895         rc = lcs_ready_buffer(&card->write, buffer);
896         if (rc)
897                 return rc;
898         init_timer_on_stack(&timer);
899         timer.function = lcs_lancmd_timeout;
900         timer.data = (unsigned long) reply;
901         timer.expires = jiffies + HZ*card->lancmd_timeout;
902         add_timer(&timer);
903         wait_event(reply->wait_q, reply->received);
904         del_timer_sync(&timer);
905         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
906         rc = reply->rc;
907         lcs_put_reply(reply);
908         return rc ? -EIO : 0;
909 }
910
911 /**
912  * LCS startup command
913  */
914 static int
915 lcs_send_startup(struct lcs_card *card, __u8 initiator)
916 {
917         struct lcs_buffer *buffer;
918         struct lcs_cmd *cmd;
919
920         LCS_DBF_TEXT(2, trace, "startup");
921         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
922         cmd = (struct lcs_cmd *) buffer->data;
923         cmd->cmd_code = LCS_CMD_STARTUP;
924         cmd->initiator = initiator;
925         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
926         return lcs_send_lancmd(card, buffer, NULL);
927 }
928
929 /**
930  * LCS shutdown command
931  */
932 static int
933 lcs_send_shutdown(struct lcs_card *card)
934 {
935         struct lcs_buffer *buffer;
936         struct lcs_cmd *cmd;
937
938         LCS_DBF_TEXT(2, trace, "shutdown");
939         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
940         cmd = (struct lcs_cmd *) buffer->data;
941         cmd->cmd_code = LCS_CMD_SHUTDOWN;
942         cmd->initiator = LCS_INITIATOR_TCPIP;
943         return lcs_send_lancmd(card, buffer, NULL);
944 }
945
946 /**
947  * LCS lanstat command
948  */
949 static void
950 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
951 {
952         LCS_DBF_TEXT(2, trace, "statcb");
953         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
954 }
955
956 static int
957 lcs_send_lanstat(struct lcs_card *card)
958 {
959         struct lcs_buffer *buffer;
960         struct lcs_cmd *cmd;
961
962         LCS_DBF_TEXT(2,trace, "cmdstat");
963         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
964         cmd = (struct lcs_cmd *) buffer->data;
965         /* Setup lanstat command. */
966         cmd->cmd_code = LCS_CMD_LANSTAT;
967         cmd->initiator = LCS_INITIATOR_TCPIP;
968         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
969         cmd->cmd.lcs_std_cmd.portno = card->portno;
970         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
971 }
972
973 /**
974  * send stoplan command
975  */
976 static int
977 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
978 {
979         struct lcs_buffer *buffer;
980         struct lcs_cmd *cmd;
981
982         LCS_DBF_TEXT(2, trace, "cmdstpln");
983         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
984         cmd = (struct lcs_cmd *) buffer->data;
985         cmd->cmd_code = LCS_CMD_STOPLAN;
986         cmd->initiator = initiator;
987         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
988         cmd->cmd.lcs_std_cmd.portno = card->portno;
989         return lcs_send_lancmd(card, buffer, NULL);
990 }
991
992 /**
993  * send startlan command
994  */
995 static void
996 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
997 {
998         LCS_DBF_TEXT(2, trace, "srtlancb");
999         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
1000         card->portno = cmd->cmd.lcs_std_cmd.portno;
1001 }
1002
1003 static int
1004 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1005 {
1006         struct lcs_buffer *buffer;
1007         struct lcs_cmd *cmd;
1008
1009         LCS_DBF_TEXT(2, trace, "cmdstaln");
1010         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1011         cmd = (struct lcs_cmd *) buffer->data;
1012         cmd->cmd_code = LCS_CMD_STARTLAN;
1013         cmd->initiator = initiator;
1014         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1015         cmd->cmd.lcs_std_cmd.portno = card->portno;
1016         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1017 }
1018
1019 #ifdef CONFIG_IP_MULTICAST
1020 /**
1021  * send setipm command (Multicast)
1022  */
1023 static int
1024 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1025 {
1026         struct lcs_buffer *buffer;
1027         struct lcs_cmd *cmd;
1028
1029         LCS_DBF_TEXT(2, trace, "cmdsetim");
1030         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1031         cmd = (struct lcs_cmd *) buffer->data;
1032         cmd->cmd_code = LCS_CMD_SETIPM;
1033         cmd->initiator = LCS_INITIATOR_TCPIP;
1034         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1035         cmd->cmd.lcs_qipassist.portno = card->portno;
1036         cmd->cmd.lcs_qipassist.version = 4;
1037         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1038         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1039                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1040         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1041         return lcs_send_lancmd(card, buffer, NULL);
1042 }
1043
1044 /**
1045  * send delipm command (Multicast)
1046  */
1047 static int
1048 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1049 {
1050         struct lcs_buffer *buffer;
1051         struct lcs_cmd *cmd;
1052
1053         LCS_DBF_TEXT(2, trace, "cmddelim");
1054         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1055         cmd = (struct lcs_cmd *) buffer->data;
1056         cmd->cmd_code = LCS_CMD_DELIPM;
1057         cmd->initiator = LCS_INITIATOR_TCPIP;
1058         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1059         cmd->cmd.lcs_qipassist.portno = card->portno;
1060         cmd->cmd.lcs_qipassist.version = 4;
1061         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1062         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1063                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1064         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1065         return lcs_send_lancmd(card, buffer, NULL);
1066 }
1067
1068 /**
1069  * check if multicast is supported by LCS
1070  */
1071 static void
1072 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1073 {
1074         LCS_DBF_TEXT(2, trace, "chkmccb");
1075         card->ip_assists_supported =
1076                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1077         card->ip_assists_enabled =
1078                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1079 }
1080
1081 static int
1082 lcs_check_multicast_support(struct lcs_card *card)
1083 {
1084         struct lcs_buffer *buffer;
1085         struct lcs_cmd *cmd;
1086         int rc;
1087
1088         LCS_DBF_TEXT(2, trace, "cmdqipa");
1089         /* Send query ipassist. */
1090         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1091         cmd = (struct lcs_cmd *) buffer->data;
1092         cmd->cmd_code = LCS_CMD_QIPASSIST;
1093         cmd->initiator = LCS_INITIATOR_TCPIP;
1094         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1095         cmd->cmd.lcs_qipassist.portno = card->portno;
1096         cmd->cmd.lcs_qipassist.version = 4;
1097         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1098         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1099         if (rc != 0) {
1100                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1101                 return -EOPNOTSUPP;
1102         }
1103         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1104                 return 0;
1105         return -EOPNOTSUPP;
1106 }
1107
1108 /**
1109  * set or del multicast address on LCS card
1110  */
1111 static void
1112 lcs_fix_multicast_list(struct lcs_card *card)
1113 {
1114         struct list_head failed_list;
1115         struct lcs_ipm_list *ipm, *tmp;
1116         unsigned long flags;
1117         int rc;
1118
1119         LCS_DBF_TEXT(4,trace, "fixipm");
1120         INIT_LIST_HEAD(&failed_list);
1121         spin_lock_irqsave(&card->ipm_lock, flags);
1122 list_modified:
1123         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1124                 switch (ipm->ipm_state) {
1125                 case LCS_IPM_STATE_SET_REQUIRED:
1126                         /* del from ipm_list so noone else can tamper with
1127                          * this entry */
1128                         list_del_init(&ipm->list);
1129                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1130                         rc = lcs_send_setipm(card, ipm);
1131                         spin_lock_irqsave(&card->ipm_lock, flags);
1132                         if (rc) {
1133                                 pr_info("Adding multicast address failed."
1134                                         " Table possibly full!\n");
1135                                 /* store ipm in failed list -> will be added
1136                                  * to ipm_list again, so a retry will be done
1137                                  * during the next call of this function */
1138                                 list_add_tail(&ipm->list, &failed_list);
1139                         } else {
1140                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1141                                 /* re-insert into ipm_list */
1142                                 list_add_tail(&ipm->list, &card->ipm_list);
1143                         }
1144                         goto list_modified;
1145                 case LCS_IPM_STATE_DEL_REQUIRED:
1146                         list_del(&ipm->list);
1147                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1148                         lcs_send_delipm(card, ipm);
1149                         spin_lock_irqsave(&card->ipm_lock, flags);
1150                         kfree(ipm);
1151                         goto list_modified;
1152                 case LCS_IPM_STATE_ON_CARD:
1153                         break;
1154                 }
1155         }
1156         /* re-insert all entries from the failed_list into ipm_list */
1157         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1158                 list_move_tail(&ipm->list, &card->ipm_list);
1159
1160         spin_unlock_irqrestore(&card->ipm_lock, flags);
1161 }
1162
1163 /**
1164  * get mac address for the relevant Multicast address
1165  */
1166 static void
1167 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1168 {
1169         LCS_DBF_TEXT(4,trace, "getmac");
1170         if (dev->type == ARPHRD_IEEE802_TR)
1171                 ip_tr_mc_map(ipm, mac);
1172         else
1173                 ip_eth_mc_map(ipm, mac);
1174 }
1175
1176 /**
1177  * function called by net device to handle multicast address relevant things
1178  */
1179 static inline void
1180 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1181 {
1182         struct ip_mc_list *im4;
1183         struct list_head *l;
1184         struct lcs_ipm_list *ipm;
1185         unsigned long flags;
1186         char buf[MAX_ADDR_LEN];
1187
1188         LCS_DBF_TEXT(4, trace, "remmclst");
1189         spin_lock_irqsave(&card->ipm_lock, flags);
1190         list_for_each(l, &card->ipm_list) {
1191                 ipm = list_entry(l, struct lcs_ipm_list, list);
1192                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1193                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1194                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1195                              (memcmp(buf, &ipm->ipm.mac_addr,
1196                                      LCS_MAC_LENGTH) == 0) )
1197                                 break;
1198                 }
1199                 if (im4 == NULL)
1200                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1201         }
1202         spin_unlock_irqrestore(&card->ipm_lock, flags);
1203 }
1204
1205 static inline struct lcs_ipm_list *
1206 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1207 {
1208         struct lcs_ipm_list *tmp, *ipm = NULL;
1209         struct list_head *l;
1210         unsigned long flags;
1211
1212         LCS_DBF_TEXT(4, trace, "chkmcent");
1213         spin_lock_irqsave(&card->ipm_lock, flags);
1214         list_for_each(l, &card->ipm_list) {
1215                 tmp = list_entry(l, struct lcs_ipm_list, list);
1216                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1217                      (memcmp(buf, &tmp->ipm.mac_addr,
1218                              LCS_MAC_LENGTH) == 0) ) {
1219                         ipm = tmp;
1220                         break;
1221                 }
1222         }
1223         spin_unlock_irqrestore(&card->ipm_lock, flags);
1224         return ipm;
1225 }
1226
1227 static inline void
1228 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1229 {
1230
1231         struct ip_mc_list *im4;
1232         struct lcs_ipm_list *ipm;
1233         char buf[MAX_ADDR_LEN];
1234         unsigned long flags;
1235
1236         LCS_DBF_TEXT(4, trace, "setmclst");
1237         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1238                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1239                 ipm = lcs_check_addr_entry(card, im4, buf);
1240                 if (ipm != NULL)
1241                         continue;       /* Address already in list. */
1242                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1243                 if (ipm == NULL) {
1244                         pr_info("Not enough memory to add"
1245                                 " new multicast entry!\n");
1246                         break;
1247                 }
1248                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1249                 ipm->ipm.ip_addr = im4->multiaddr;
1250                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1251                 spin_lock_irqsave(&card->ipm_lock, flags);
1252                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1253                 list_add(&ipm->list, &card->ipm_list);
1254                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1255         }
1256 }
1257
1258 static int
1259 lcs_register_mc_addresses(void *data)
1260 {
1261         struct lcs_card *card;
1262         struct in_device *in4_dev;
1263
1264         card = (struct lcs_card *) data;
1265
1266         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1267                 return 0;
1268         LCS_DBF_TEXT(4, trace, "regmulti");
1269
1270         in4_dev = in_dev_get(card->dev);
1271         if (in4_dev == NULL)
1272                 goto out;
1273         read_lock(&in4_dev->mc_list_lock);
1274         lcs_remove_mc_addresses(card,in4_dev);
1275         lcs_set_mc_addresses(card, in4_dev);
1276         read_unlock(&in4_dev->mc_list_lock);
1277         in_dev_put(in4_dev);
1278
1279         netif_carrier_off(card->dev);
1280         netif_tx_disable(card->dev);
1281         wait_event(card->write.wait_q,
1282                         (card->write.state != LCS_CH_STATE_RUNNING));
1283         lcs_fix_multicast_list(card);
1284         if (card->state == DEV_STATE_UP) {
1285                 netif_carrier_on(card->dev);
1286                 netif_wake_queue(card->dev);
1287         }
1288 out:
1289         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1290         return 0;
1291 }
1292 #endif /* CONFIG_IP_MULTICAST */
1293
1294 /**
1295  * function called by net device to
1296  * handle multicast address relevant things
1297  */
1298 static void
1299 lcs_set_multicast_list(struct net_device *dev)
1300 {
1301 #ifdef CONFIG_IP_MULTICAST
1302         struct lcs_card *card;
1303
1304         LCS_DBF_TEXT(4, trace, "setmulti");
1305         card = (struct lcs_card *) dev->ml_priv;
1306
1307         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1308                 schedule_work(&card->kernel_thread_starter);
1309 #endif /* CONFIG_IP_MULTICAST */
1310 }
1311
1312 static long
1313 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1314 {
1315         if (!IS_ERR(irb))
1316                 return 0;
1317
1318         switch (PTR_ERR(irb)) {
1319         case -EIO:
1320                 dev_warn(&cdev->dev,
1321                         "An I/O-error occurred on the LCS device\n");
1322                 LCS_DBF_TEXT(2, trace, "ckirberr");
1323                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1324                 break;
1325         case -ETIMEDOUT:
1326                 dev_warn(&cdev->dev,
1327                         "A command timed out on the LCS device\n");
1328                 LCS_DBF_TEXT(2, trace, "ckirberr");
1329                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1330                 break;
1331         default:
1332                 dev_warn(&cdev->dev,
1333                         "An error occurred on the LCS device, rc=%ld\n",
1334                         PTR_ERR(irb));
1335                 LCS_DBF_TEXT(2, trace, "ckirberr");
1336                 LCS_DBF_TEXT(2, trace, "  rc???");
1337         }
1338         return PTR_ERR(irb);
1339 }
1340
1341 static int
1342 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1343 {
1344         int dstat, cstat;
1345         char *sense;
1346
1347         sense = (char *) irb->ecw;
1348         cstat = irb->scsw.cmd.cstat;
1349         dstat = irb->scsw.cmd.dstat;
1350
1351         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1352                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1353                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1354                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1355                 return 1;
1356         }
1357         if (dstat & DEV_STAT_UNIT_CHECK) {
1358                 if (sense[LCS_SENSE_BYTE_1] &
1359                     LCS_SENSE_RESETTING_EVENT) {
1360                         LCS_DBF_TEXT(2, trace, "REVIND");
1361                         return 1;
1362                 }
1363                 if (sense[LCS_SENSE_BYTE_0] &
1364                     LCS_SENSE_CMD_REJECT) {
1365                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1366                         return 0;
1367                 }
1368                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1369                     (!sense[LCS_SENSE_BYTE_1]) &&
1370                     (!sense[LCS_SENSE_BYTE_2]) &&
1371                     (!sense[LCS_SENSE_BYTE_3])) {
1372                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1373                         return 0;
1374                 }
1375                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1376                 return 1;
1377         }
1378         return 0;
1379 }
1380
1381 static void
1382 lcs_schedule_recovery(struct lcs_card *card)
1383 {
1384         LCS_DBF_TEXT(2, trace, "startrec");
1385         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1386                 schedule_work(&card->kernel_thread_starter);
1387 }
1388
1389 /**
1390  * IRQ Handler for LCS channels
1391  */
1392 static void
1393 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1394 {
1395         struct lcs_card *card;
1396         struct lcs_channel *channel;
1397         int rc, index;
1398         int cstat, dstat;
1399
1400         kstat_cpu(smp_processor_id()).irqs[IOINT_LCS]++;
1401         if (lcs_check_irb_error(cdev, irb))
1402                 return;
1403
1404         card = CARD_FROM_DEV(cdev);
1405         if (card->read.ccwdev == cdev)
1406                 channel = &card->read;
1407         else
1408                 channel = &card->write;
1409
1410         cstat = irb->scsw.cmd.cstat;
1411         dstat = irb->scsw.cmd.dstat;
1412         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1413         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1414                       irb->scsw.cmd.dstat);
1415         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1416                       irb->scsw.cmd.actl);
1417
1418         /* Check for channel and device errors presented */
1419         rc = lcs_get_problem(cdev, irb);
1420         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1421                 dev_warn(&cdev->dev,
1422                         "The LCS device stopped because of an error,"
1423                         " dstat=0x%X, cstat=0x%X \n",
1424                             dstat, cstat);
1425                 if (rc) {
1426                         channel->state = LCS_CH_STATE_ERROR;
1427                 }
1428         }
1429         if (channel->state == LCS_CH_STATE_ERROR) {
1430                 lcs_schedule_recovery(card);
1431                 wake_up(&card->wait_q);
1432                 return;
1433         }
1434         /* How far in the ccw chain have we processed? */
1435         if ((channel->state != LCS_CH_STATE_INIT) &&
1436             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1437             (irb->scsw.cmd.cpa != 0)) {
1438                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1439                         - channel->ccws;
1440                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1441                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1442                         /* Bloody io subsystem tells us lies about cpa... */
1443                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1444                 while (channel->io_idx != index) {
1445                         __lcs_processed_buffer(channel,
1446                                                channel->iob + channel->io_idx);
1447                         channel->io_idx =
1448                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1449                 }
1450         }
1451
1452         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1453             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1454             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1455                 /* Mark channel as stopped. */
1456                 channel->state = LCS_CH_STATE_STOPPED;
1457         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1458                 /* CCW execution stopped on a suspend bit. */
1459                 channel->state = LCS_CH_STATE_SUSPENDED;
1460         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1461                 if (irb->scsw.cmd.cc != 0) {
1462                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1463                         return;
1464                 }
1465                 /* The channel has been stopped by halt_IO. */
1466                 channel->state = LCS_CH_STATE_HALTED;
1467         }
1468         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1469                 channel->state = LCS_CH_STATE_CLEARED;
1470         /* Do the rest in the tasklet. */
1471         tasklet_schedule(&channel->irq_tasklet);
1472 }
1473
1474 /**
1475  * Tasklet for IRQ handler
1476  */
1477 static void
1478 lcs_tasklet(unsigned long data)
1479 {
1480         unsigned long flags;
1481         struct lcs_channel *channel;
1482         struct lcs_buffer *iob;
1483         int buf_idx;
1484         int rc;
1485
1486         channel = (struct lcs_channel *) data;
1487         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1488
1489         /* Check for processed buffers. */
1490         iob = channel->iob;
1491         buf_idx = channel->buf_idx;
1492         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1493                 /* Do the callback thing. */
1494                 if (iob[buf_idx].callback != NULL)
1495                         iob[buf_idx].callback(channel, iob + buf_idx);
1496                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1497         }
1498         channel->buf_idx = buf_idx;
1499
1500         if (channel->state == LCS_CH_STATE_STOPPED)
1501                 // FIXME: what if rc != 0 ??
1502                 rc = lcs_start_channel(channel);
1503         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1504         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1505             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1506                 // FIXME: what if rc != 0 ??
1507                 rc = __lcs_resume_channel(channel);
1508         }
1509         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1510
1511         /* Something happened on the channel. Wake up waiters. */
1512         wake_up(&channel->wait_q);
1513 }
1514
1515 /**
1516  * Finish current tx buffer and make it ready for transmit.
1517  */
1518 static void
1519 __lcs_emit_txbuffer(struct lcs_card *card)
1520 {
1521         LCS_DBF_TEXT(5, trace, "emittx");
1522         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1523         card->tx_buffer->count += 2;
1524         lcs_ready_buffer(&card->write, card->tx_buffer);
1525         card->tx_buffer = NULL;
1526         card->tx_emitted++;
1527 }
1528
1529 /**
1530  * Callback for finished tx buffers.
1531  */
1532 static void
1533 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1534 {
1535         struct lcs_card *card;
1536
1537         LCS_DBF_TEXT(5, trace, "txbuffcb");
1538         /* Put buffer back to pool. */
1539         lcs_release_buffer(channel, buffer);
1540         card = container_of(channel, struct lcs_card, write);
1541         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1542                 netif_wake_queue(card->dev);
1543         spin_lock(&card->lock);
1544         card->tx_emitted--;
1545         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1546                 /*
1547                  * Last running tx buffer has finished. Submit partially
1548                  * filled current buffer.
1549                  */
1550                 __lcs_emit_txbuffer(card);
1551         spin_unlock(&card->lock);
1552 }
1553
1554 /**
1555  * Packet transmit function called by network stack
1556  */
1557 static int
1558 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1559                  struct net_device *dev)
1560 {
1561         struct lcs_header *header;
1562         int rc = NETDEV_TX_OK;
1563
1564         LCS_DBF_TEXT(5, trace, "hardxmit");
1565         if (skb == NULL) {
1566                 card->stats.tx_dropped++;
1567                 card->stats.tx_errors++;
1568                 return NETDEV_TX_OK;
1569         }
1570         if (card->state != DEV_STATE_UP) {
1571                 dev_kfree_skb(skb);
1572                 card->stats.tx_dropped++;
1573                 card->stats.tx_errors++;
1574                 card->stats.tx_carrier_errors++;
1575                 return NETDEV_TX_OK;
1576         }
1577         if (skb->protocol == htons(ETH_P_IPV6)) {
1578                 dev_kfree_skb(skb);
1579                 return NETDEV_TX_OK;
1580         }
1581         netif_stop_queue(card->dev);
1582         spin_lock(&card->lock);
1583         if (card->tx_buffer != NULL &&
1584             card->tx_buffer->count + sizeof(struct lcs_header) +
1585             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1586                 /* skb too big for current tx buffer. */
1587                 __lcs_emit_txbuffer(card);
1588         if (card->tx_buffer == NULL) {
1589                 /* Get new tx buffer */
1590                 card->tx_buffer = lcs_get_buffer(&card->write);
1591                 if (card->tx_buffer == NULL) {
1592                         card->stats.tx_dropped++;
1593                         rc = NETDEV_TX_BUSY;
1594                         goto out;
1595                 }
1596                 card->tx_buffer->callback = lcs_txbuffer_cb;
1597                 card->tx_buffer->count = 0;
1598         }
1599         header = (struct lcs_header *)
1600                 (card->tx_buffer->data + card->tx_buffer->count);
1601         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1602         header->offset = card->tx_buffer->count;
1603         header->type = card->lan_type;
1604         header->slot = card->portno;
1605         skb_copy_from_linear_data(skb, header + 1, skb->len);
1606         spin_unlock(&card->lock);
1607         card->stats.tx_bytes += skb->len;
1608         card->stats.tx_packets++;
1609         dev_kfree_skb(skb);
1610         netif_wake_queue(card->dev);
1611         spin_lock(&card->lock);
1612         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1613                 /* If this is the first tx buffer emit it immediately. */
1614                 __lcs_emit_txbuffer(card);
1615 out:
1616         spin_unlock(&card->lock);
1617         return rc;
1618 }
1619
1620 static int
1621 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1622 {
1623         struct lcs_card *card;
1624         int rc;
1625
1626         LCS_DBF_TEXT(5, trace, "pktxmit");
1627         card = (struct lcs_card *) dev->ml_priv;
1628         rc = __lcs_start_xmit(card, skb, dev);
1629         return rc;
1630 }
1631
1632 /**
1633  * send startlan and lanstat command to make LCS device ready
1634  */
1635 static int
1636 lcs_startlan_auto(struct lcs_card *card)
1637 {
1638         int rc;
1639
1640         LCS_DBF_TEXT(2, trace, "strtauto");
1641 #ifdef CONFIG_NET_ETHERNET
1642         card->lan_type = LCS_FRAME_TYPE_ENET;
1643         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1644         if (rc == 0)
1645                 return 0;
1646
1647 #endif
1648 #ifdef CONFIG_TR
1649         card->lan_type = LCS_FRAME_TYPE_TR;
1650         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1651         if (rc == 0)
1652                 return 0;
1653 #endif
1654 #ifdef CONFIG_FDDI
1655         card->lan_type = LCS_FRAME_TYPE_FDDI;
1656         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1657         if (rc == 0)
1658                 return 0;
1659 #endif
1660         return -EIO;
1661 }
1662
1663 static int
1664 lcs_startlan(struct lcs_card *card)
1665 {
1666         int rc, i;
1667
1668         LCS_DBF_TEXT(2, trace, "startlan");
1669         rc = 0;
1670         if (card->portno != LCS_INVALID_PORT_NO) {
1671                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1672                         rc = lcs_startlan_auto(card);
1673                 else
1674                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1675         } else {
1676                 for (i = 0; i <= 16; i++) {
1677                         card->portno = i;
1678                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1679                                 rc = lcs_send_startlan(card,
1680                                                        LCS_INITIATOR_TCPIP);
1681                         else
1682                                 /* autodetecting lan type */
1683                                 rc = lcs_startlan_auto(card);
1684                         if (rc == 0)
1685                                 break;
1686                 }
1687         }
1688         if (rc == 0)
1689                 return lcs_send_lanstat(card);
1690         return rc;
1691 }
1692
1693 /**
1694  * LCS detect function
1695  * setup channels and make them I/O ready
1696  */
1697 static int
1698 lcs_detect(struct lcs_card *card)
1699 {
1700         int rc = 0;
1701
1702         LCS_DBF_TEXT(2, setup, "lcsdetct");
1703         /* start/reset card */
1704         if (card->dev)
1705                 netif_stop_queue(card->dev);
1706         rc = lcs_stop_channels(card);
1707         if (rc == 0) {
1708                 rc = lcs_start_channels(card);
1709                 if (rc == 0) {
1710                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1711                         if (rc == 0)
1712                                 rc = lcs_startlan(card);
1713                 }
1714         }
1715         if (rc == 0) {
1716                 card->state = DEV_STATE_UP;
1717         } else {
1718                 card->state = DEV_STATE_DOWN;
1719                 card->write.state = LCS_CH_STATE_INIT;
1720                 card->read.state =  LCS_CH_STATE_INIT;
1721         }
1722         return rc;
1723 }
1724
1725 /**
1726  * LCS Stop card
1727  */
1728 static int
1729 lcs_stopcard(struct lcs_card *card)
1730 {
1731         int rc;
1732
1733         LCS_DBF_TEXT(3, setup, "stopcard");
1734
1735         if (card->read.state != LCS_CH_STATE_STOPPED &&
1736             card->write.state != LCS_CH_STATE_STOPPED &&
1737             card->read.state != LCS_CH_STATE_ERROR &&
1738             card->write.state != LCS_CH_STATE_ERROR &&
1739             card->state == DEV_STATE_UP) {
1740                 lcs_clear_multicast_list(card);
1741                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1742                 rc = lcs_send_shutdown(card);
1743         }
1744         rc = lcs_stop_channels(card);
1745         card->state = DEV_STATE_DOWN;
1746
1747         return rc;
1748 }
1749
1750 /**
1751  * Kernel Thread helper functions for LGW initiated commands
1752  */
1753 static void
1754 lcs_start_kernel_thread(struct work_struct *work)
1755 {
1756         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1757         LCS_DBF_TEXT(5, trace, "krnthrd");
1758         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1759                 kthread_run(lcs_recovery, card, "lcs_recover");
1760 #ifdef CONFIG_IP_MULTICAST
1761         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1762                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1763 #endif
1764 }
1765
1766 /**
1767  * Process control frames.
1768  */
1769 static void
1770 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1771 {
1772         LCS_DBF_TEXT(5, trace, "getctrl");
1773         if (cmd->initiator == LCS_INITIATOR_LGW) {
1774                 switch(cmd->cmd_code) {
1775                 case LCS_CMD_STARTUP:
1776                 case LCS_CMD_STARTLAN:
1777                         lcs_schedule_recovery(card);
1778                         break;
1779                 case LCS_CMD_STOPLAN:
1780                         pr_warning("Stoplan for %s initiated by LGW.\n",
1781                                    card->dev->name);
1782                         if (card->dev)
1783                                 netif_carrier_off(card->dev);
1784                         break;
1785                 default:
1786                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1787                         break;
1788                 }
1789         } else
1790                 lcs_notify_lancmd_waiters(card, cmd);
1791 }
1792
1793 /**
1794  * Unpack network packet.
1795  */
1796 static void
1797 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1798 {
1799         struct sk_buff *skb;
1800
1801         LCS_DBF_TEXT(5, trace, "getskb");
1802         if (card->dev == NULL ||
1803             card->state != DEV_STATE_UP)
1804                 /* The card isn't up. Ignore the packet. */
1805                 return;
1806
1807         skb = dev_alloc_skb(skb_len);
1808         if (skb == NULL) {
1809                 dev_err(&card->dev->dev,
1810                         " Allocating a socket buffer to interface %s failed\n",
1811                           card->dev->name);
1812                 card->stats.rx_dropped++;
1813                 return;
1814         }
1815         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1816         skb->protocol = card->lan_type_trans(skb, card->dev);
1817         card->stats.rx_bytes += skb_len;
1818         card->stats.rx_packets++;
1819         if (skb->protocol == htons(ETH_P_802_2))
1820                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1821         netif_rx(skb);
1822 }
1823
1824 /**
1825  * LCS main routine to get packets and lancmd replies from the buffers
1826  */
1827 static void
1828 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1829 {
1830         struct lcs_card *card;
1831         struct lcs_header *lcs_hdr;
1832         __u16 offset;
1833
1834         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1835         lcs_hdr = (struct lcs_header *) buffer->data;
1836         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1837                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1838                 return;
1839         }
1840         card = container_of(channel, struct lcs_card, read);
1841         offset = 0;
1842         while (lcs_hdr->offset != 0) {
1843                 if (lcs_hdr->offset <= 0 ||
1844                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1845                     lcs_hdr->offset < offset) {
1846                         /* Offset invalid. */
1847                         card->stats.rx_length_errors++;
1848                         card->stats.rx_errors++;
1849                         return;
1850                 }
1851                 /* What kind of frame is it? */
1852                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1853                         /* Control frame. */
1854                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1855                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1856                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1857                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1858                         /* Normal network packet. */
1859                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1860                                     lcs_hdr->offset - offset -
1861                                     sizeof(struct lcs_header));
1862                 else
1863                         /* Unknown frame type. */
1864                         ; // FIXME: error message ?
1865                 /* Proceed to next frame. */
1866                 offset = lcs_hdr->offset;
1867                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1868                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1869         }
1870         /* The buffer is now empty. Make it ready again. */
1871         lcs_ready_buffer(&card->read, buffer);
1872 }
1873
1874 /**
1875  * get network statistics for ifconfig and other user programs
1876  */
1877 static struct net_device_stats *
1878 lcs_getstats(struct net_device *dev)
1879 {
1880         struct lcs_card *card;
1881
1882         LCS_DBF_TEXT(4, trace, "netstats");
1883         card = (struct lcs_card *) dev->ml_priv;
1884         return &card->stats;
1885 }
1886
1887 /**
1888  * stop lcs device
1889  * This function will be called by user doing ifconfig xxx down
1890  */
1891 static int
1892 lcs_stop_device(struct net_device *dev)
1893 {
1894         struct lcs_card *card;
1895         int rc;
1896
1897         LCS_DBF_TEXT(2, trace, "stopdev");
1898         card   = (struct lcs_card *) dev->ml_priv;
1899         netif_carrier_off(dev);
1900         netif_tx_disable(dev);
1901         dev->flags &= ~IFF_UP;
1902         wait_event(card->write.wait_q,
1903                 (card->write.state != LCS_CH_STATE_RUNNING));
1904         rc = lcs_stopcard(card);
1905         if (rc)
1906                 dev_err(&card->dev->dev,
1907                         " Shutting down the LCS device failed\n ");
1908         return rc;
1909 }
1910
1911 /**
1912  * start lcs device and make it runnable
1913  * This function will be called by user doing ifconfig xxx up
1914  */
1915 static int
1916 lcs_open_device(struct net_device *dev)
1917 {
1918         struct lcs_card *card;
1919         int rc;
1920
1921         LCS_DBF_TEXT(2, trace, "opendev");
1922         card = (struct lcs_card *) dev->ml_priv;
1923         /* initialize statistics */
1924         rc = lcs_detect(card);
1925         if (rc) {
1926                 pr_err("Error in opening device!\n");
1927
1928         } else {
1929                 dev->flags |= IFF_UP;
1930                 netif_carrier_on(dev);
1931                 netif_wake_queue(dev);
1932                 card->state = DEV_STATE_UP;
1933         }
1934         return rc;
1935 }
1936
1937 /**
1938  * show function for portno called by cat or similar things
1939  */
1940 static ssize_t
1941 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1942 {
1943         struct lcs_card *card;
1944
1945         card = dev_get_drvdata(dev);
1946
1947         if (!card)
1948                 return 0;
1949
1950         return sprintf(buf, "%d\n", card->portno);
1951 }
1952
1953 /**
1954  * store the value which is piped to file portno
1955  */
1956 static ssize_t
1957 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1958 {
1959         struct lcs_card *card;
1960         int value;
1961
1962         card = dev_get_drvdata(dev);
1963
1964         if (!card)
1965                 return 0;
1966
1967         sscanf(buf, "%u", &value);
1968         /* TODO: sanity checks */
1969         card->portno = value;
1970
1971         return count;
1972
1973 }
1974
1975 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1976
1977 const char *lcs_type[] = {
1978         "not a channel",
1979         "2216 parallel",
1980         "2216 channel",
1981         "OSA LCS card",
1982         "unknown channel type",
1983         "unsupported channel type",
1984 };
1985
1986 static ssize_t
1987 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1988 {
1989         struct ccwgroup_device *cgdev;
1990
1991         cgdev = to_ccwgroupdev(dev);
1992         if (!cgdev)
1993                 return -ENODEV;
1994
1995         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1996 }
1997
1998 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1999
2000 static ssize_t
2001 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2002 {
2003         struct lcs_card *card;
2004
2005         card = dev_get_drvdata(dev);
2006
2007         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2008 }
2009
2010 static ssize_t
2011 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2012 {
2013         struct lcs_card *card;
2014         int value;
2015
2016         card = dev_get_drvdata(dev);
2017
2018         if (!card)
2019                 return 0;
2020
2021         sscanf(buf, "%u", &value);
2022         /* TODO: sanity checks */
2023         card->lancmd_timeout = value;
2024
2025         return count;
2026
2027 }
2028
2029 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2030
2031 static ssize_t
2032 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2033                       const char *buf, size_t count)
2034 {
2035         struct lcs_card *card = dev_get_drvdata(dev);
2036         char *tmp;
2037         int i;
2038
2039         if (!card)
2040                 return -EINVAL;
2041         if (card->state != DEV_STATE_UP)
2042                 return -EPERM;
2043         i = simple_strtoul(buf, &tmp, 16);
2044         if (i == 1)
2045                 lcs_schedule_recovery(card);
2046         return count;
2047 }
2048
2049 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2050
2051 static struct attribute * lcs_attrs[] = {
2052         &dev_attr_portno.attr,
2053         &dev_attr_type.attr,
2054         &dev_attr_lancmd_timeout.attr,
2055         &dev_attr_recover.attr,
2056         NULL,
2057 };
2058
2059 static struct attribute_group lcs_attr_group = {
2060         .attrs = lcs_attrs,
2061 };
2062
2063 /**
2064  * lcs_probe_device is called on establishing a new ccwgroup_device.
2065  */
2066 static int
2067 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2068 {
2069         struct lcs_card *card;
2070         int ret;
2071
2072         if (!get_device(&ccwgdev->dev))
2073                 return -ENODEV;
2074
2075         LCS_DBF_TEXT(2, setup, "add_dev");
2076         card = lcs_alloc_card();
2077         if (!card) {
2078                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2079                 put_device(&ccwgdev->dev);
2080                 return -ENOMEM;
2081         }
2082         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2083         if (ret) {
2084                 lcs_free_card(card);
2085                 put_device(&ccwgdev->dev);
2086                 return ret;
2087         }
2088         dev_set_drvdata(&ccwgdev->dev, card);
2089         ccwgdev->cdev[0]->handler = lcs_irq;
2090         ccwgdev->cdev[1]->handler = lcs_irq;
2091         card->gdev = ccwgdev;
2092         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2093         card->thread_start_mask = 0;
2094         card->thread_allowed_mask = 0;
2095         card->thread_running_mask = 0;
2096         return 0;
2097 }
2098
2099 static int
2100 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2101 {
2102         struct lcs_card *card;
2103
2104         LCS_DBF_TEXT(2, setup, "regnetdv");
2105         card = dev_get_drvdata(&ccwgdev->dev);
2106         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2107                 return 0;
2108         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2109         return register_netdev(card->dev);
2110 }
2111
2112 /**
2113  * lcs_new_device will be called by setting the group device online.
2114  */
2115 static const struct net_device_ops lcs_netdev_ops = {
2116         .ndo_open               = lcs_open_device,
2117         .ndo_stop               = lcs_stop_device,
2118         .ndo_get_stats          = lcs_getstats,
2119         .ndo_start_xmit         = lcs_start_xmit,
2120 };
2121
2122 static const struct net_device_ops lcs_mc_netdev_ops = {
2123         .ndo_open               = lcs_open_device,
2124         .ndo_stop               = lcs_stop_device,
2125         .ndo_get_stats          = lcs_getstats,
2126         .ndo_start_xmit         = lcs_start_xmit,
2127         .ndo_set_multicast_list = lcs_set_multicast_list,
2128 };
2129
2130 static int
2131 lcs_new_device(struct ccwgroup_device *ccwgdev)
2132 {
2133         struct  lcs_card *card;
2134         struct net_device *dev=NULL;
2135         enum lcs_dev_states recover_state;
2136         int rc;
2137
2138         card = dev_get_drvdata(&ccwgdev->dev);
2139         if (!card)
2140                 return -ENODEV;
2141
2142         LCS_DBF_TEXT(2, setup, "newdev");
2143         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2144         card->read.ccwdev  = ccwgdev->cdev[0];
2145         card->write.ccwdev = ccwgdev->cdev[1];
2146
2147         recover_state = card->state;
2148         rc = ccw_device_set_online(card->read.ccwdev);
2149         if (rc)
2150                 goto out_err;
2151         rc = ccw_device_set_online(card->write.ccwdev);
2152         if (rc)
2153                 goto out_werr;
2154
2155         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2156
2157         lcs_setup_card(card);
2158         rc = lcs_detect(card);
2159         if (rc) {
2160                 LCS_DBF_TEXT(2, setup, "dtctfail");
2161                 dev_err(&card->dev->dev,
2162                         "Detecting a network adapter for LCS devices"
2163                         " failed with rc=%d (0x%x)\n", rc, rc);
2164                 lcs_stopcard(card);
2165                 goto out;
2166         }
2167         if (card->dev) {
2168                 LCS_DBF_TEXT(2, setup, "samedev");
2169                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2170                 goto netdev_out;
2171         }
2172         switch (card->lan_type) {
2173 #ifdef CONFIG_NET_ETHERNET
2174         case LCS_FRAME_TYPE_ENET:
2175                 card->lan_type_trans = eth_type_trans;
2176                 dev = alloc_etherdev(0);
2177                 break;
2178 #endif
2179 #ifdef CONFIG_TR
2180         case LCS_FRAME_TYPE_TR:
2181                 card->lan_type_trans = tr_type_trans;
2182                 dev = alloc_trdev(0);
2183                 break;
2184 #endif
2185 #ifdef CONFIG_FDDI
2186         case LCS_FRAME_TYPE_FDDI:
2187                 card->lan_type_trans = fddi_type_trans;
2188                 dev = alloc_fddidev(0);
2189                 break;
2190 #endif
2191         default:
2192                 LCS_DBF_TEXT(3, setup, "errinit");
2193                 pr_err(" Initialization failed\n");
2194                 goto out;
2195         }
2196         if (!dev)
2197                 goto out;
2198         card->dev = dev;
2199         card->dev->ml_priv = card;
2200         card->dev->netdev_ops = &lcs_netdev_ops;
2201         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2202 #ifdef CONFIG_IP_MULTICAST
2203         if (!lcs_check_multicast_support(card))
2204                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2205 #endif
2206 netdev_out:
2207         lcs_set_allowed_threads(card,0xffffffff);
2208         if (recover_state == DEV_STATE_RECOVER) {
2209                 lcs_set_multicast_list(card->dev);
2210                 card->dev->flags |= IFF_UP;
2211                 netif_carrier_on(card->dev);
2212                 netif_wake_queue(card->dev);
2213                 card->state = DEV_STATE_UP;
2214         } else {
2215                 lcs_stopcard(card);
2216         }
2217
2218         if (lcs_register_netdev(ccwgdev) != 0)
2219                 goto out;
2220
2221         /* Print out supported assists: IPv6 */
2222         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2223                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2224                 "with" : "without");
2225         /* Print out supported assist: Multicast */
2226         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2227                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2228                 "with" : "without");
2229         return 0;
2230 out:
2231
2232         ccw_device_set_offline(card->write.ccwdev);
2233 out_werr:
2234         ccw_device_set_offline(card->read.ccwdev);
2235 out_err:
2236         return -ENODEV;
2237 }
2238
2239 /**
2240  * lcs_shutdown_device, called when setting the group device offline.
2241  */
2242 static int
2243 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2244 {
2245         struct lcs_card *card;
2246         enum lcs_dev_states recover_state;
2247         int ret;
2248
2249         LCS_DBF_TEXT(3, setup, "shtdndev");
2250         card = dev_get_drvdata(&ccwgdev->dev);
2251         if (!card)
2252                 return -ENODEV;
2253         if (recovery_mode == 0) {
2254                 lcs_set_allowed_threads(card, 0);
2255                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2256                         return -ERESTARTSYS;
2257         }
2258         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2259         recover_state = card->state;
2260
2261         ret = lcs_stop_device(card->dev);
2262         ret = ccw_device_set_offline(card->read.ccwdev);
2263         ret = ccw_device_set_offline(card->write.ccwdev);
2264         if (recover_state == DEV_STATE_UP) {
2265                 card->state = DEV_STATE_RECOVER;
2266         }
2267         if (ret)
2268                 return ret;
2269         return 0;
2270 }
2271
2272 static int
2273 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2274 {
2275         return __lcs_shutdown_device(ccwgdev, 0);
2276 }
2277
2278 /**
2279  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2280  */
2281 static int
2282 lcs_recovery(void *ptr)
2283 {
2284         struct lcs_card *card;
2285         struct ccwgroup_device *gdev;
2286         int rc;
2287
2288         card = (struct lcs_card *) ptr;
2289
2290         LCS_DBF_TEXT(4, trace, "recover1");
2291         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2292                 return 0;
2293         LCS_DBF_TEXT(4, trace, "recover2");
2294         gdev = card->gdev;
2295         dev_warn(&gdev->dev,
2296                 "A recovery process has been started for the LCS device\n");
2297         rc = __lcs_shutdown_device(gdev, 1);
2298         rc = lcs_new_device(gdev);
2299         if (!rc)
2300                 pr_info("Device %s successfully recovered!\n",
2301                         card->dev->name);
2302         else
2303                 pr_info("Device %s could not be recovered!\n",
2304                         card->dev->name);
2305         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2306         return 0;
2307 }
2308
2309 /**
2310  * lcs_remove_device, free buffers and card
2311  */
2312 static void
2313 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2314 {
2315         struct lcs_card *card;
2316
2317         card = dev_get_drvdata(&ccwgdev->dev);
2318         if (!card)
2319                 return;
2320
2321         LCS_DBF_TEXT(3, setup, "remdev");
2322         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2323         if (ccwgdev->state == CCWGROUP_ONLINE) {
2324                 lcs_shutdown_device(ccwgdev);
2325         }
2326         if (card->dev)
2327                 unregister_netdev(card->dev);
2328         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2329         lcs_cleanup_card(card);
2330         lcs_free_card(card);
2331         put_device(&ccwgdev->dev);
2332 }
2333
2334 static int lcs_pm_suspend(struct lcs_card *card)
2335 {
2336         if (card->dev)
2337                 netif_device_detach(card->dev);
2338         lcs_set_allowed_threads(card, 0);
2339         lcs_wait_for_threads(card, 0xffffffff);
2340         if (card->state != DEV_STATE_DOWN)
2341                 __lcs_shutdown_device(card->gdev, 1);
2342         return 0;
2343 }
2344
2345 static int lcs_pm_resume(struct lcs_card *card)
2346 {
2347         int rc = 0;
2348
2349         if (card->state == DEV_STATE_RECOVER)
2350                 rc = lcs_new_device(card->gdev);
2351         if (card->dev)
2352                 netif_device_attach(card->dev);
2353         if (rc) {
2354                 dev_warn(&card->gdev->dev, "The lcs device driver "
2355                         "failed to recover the device\n");
2356         }
2357         return rc;
2358 }
2359
2360 static int lcs_prepare(struct ccwgroup_device *gdev)
2361 {
2362         return 0;
2363 }
2364
2365 static void lcs_complete(struct ccwgroup_device *gdev)
2366 {
2367         return;
2368 }
2369
2370 static int lcs_freeze(struct ccwgroup_device *gdev)
2371 {
2372         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2373         return lcs_pm_suspend(card);
2374 }
2375
2376 static int lcs_thaw(struct ccwgroup_device *gdev)
2377 {
2378         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2379         return lcs_pm_resume(card);
2380 }
2381
2382 static int lcs_restore(struct ccwgroup_device *gdev)
2383 {
2384         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2385         return lcs_pm_resume(card);
2386 }
2387
2388 static struct ccw_device_id lcs_ids[] = {
2389         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2390         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2391         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2392         {},
2393 };
2394 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2395
2396 static struct ccw_driver lcs_ccw_driver = {
2397         .owner  = THIS_MODULE,
2398         .name   = "lcs",
2399         .ids    = lcs_ids,
2400         .probe  = ccwgroup_probe_ccwdev,
2401         .remove = ccwgroup_remove_ccwdev,
2402 };
2403
2404 /**
2405  * LCS ccwgroup driver registration
2406  */
2407 static struct ccwgroup_driver lcs_group_driver = {
2408         .owner       = THIS_MODULE,
2409         .name        = "lcs",
2410         .max_slaves  = 2,
2411         .driver_id   = 0xD3C3E2,
2412         .probe       = lcs_probe_device,
2413         .remove      = lcs_remove_device,
2414         .set_online  = lcs_new_device,
2415         .set_offline = lcs_shutdown_device,
2416         .prepare     = lcs_prepare,
2417         .complete    = lcs_complete,
2418         .freeze      = lcs_freeze,
2419         .thaw        = lcs_thaw,
2420         .restore     = lcs_restore,
2421 };
2422
2423 static ssize_t
2424 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2425                        size_t count)
2426 {
2427         int err;
2428         err = ccwgroup_create_from_string(lcs_root_dev,
2429                                           lcs_group_driver.driver_id,
2430                                           &lcs_ccw_driver, 2, buf);
2431         return err ? err : count;
2432 }
2433
2434 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2435
2436 static struct attribute *lcs_group_attrs[] = {
2437         &driver_attr_group.attr,
2438         NULL,
2439 };
2440
2441 static struct attribute_group lcs_group_attr_group = {
2442         .attrs = lcs_group_attrs,
2443 };
2444
2445 static const struct attribute_group *lcs_group_attr_groups[] = {
2446         &lcs_group_attr_group,
2447         NULL,
2448 };
2449
2450 /**
2451  *  LCS Module/Kernel initialization function
2452  */
2453 static int
2454 __init lcs_init_module(void)
2455 {
2456         int rc;
2457
2458         pr_info("Loading %s\n", version);
2459         rc = lcs_register_debug_facility();
2460         LCS_DBF_TEXT(0, setup, "lcsinit");
2461         if (rc)
2462                 goto out_err;
2463         lcs_root_dev = root_device_register("lcs");
2464         rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2465         if (rc)
2466                 goto register_err;
2467         rc = ccw_driver_register(&lcs_ccw_driver);
2468         if (rc)
2469                 goto ccw_err;
2470         lcs_group_driver.driver.groups = lcs_group_attr_groups;
2471         rc = ccwgroup_driver_register(&lcs_group_driver);
2472         if (rc)
2473                 goto ccwgroup_err;
2474         return 0;
2475
2476 ccwgroup_err:
2477         ccw_driver_unregister(&lcs_ccw_driver);
2478 ccw_err:
2479         root_device_unregister(lcs_root_dev);
2480 register_err:
2481         lcs_unregister_debug_facility();
2482 out_err:
2483         pr_err("Initializing the lcs device driver failed\n");
2484         return rc;
2485 }
2486
2487
2488 /**
2489  *  LCS module cleanup function
2490  */
2491 static void
2492 __exit lcs_cleanup_module(void)
2493 {
2494         pr_info("Terminating lcs module.\n");
2495         LCS_DBF_TEXT(0, trace, "cleanup");
2496         driver_remove_file(&lcs_group_driver.driver,
2497                            &driver_attr_group);
2498         ccwgroup_driver_unregister(&lcs_group_driver);
2499         ccw_driver_unregister(&lcs_ccw_driver);
2500         root_device_unregister(lcs_root_dev);
2501         lcs_unregister_debug_facility();
2502 }
2503
2504 module_init(lcs_init_module);
2505 module_exit(lcs_cleanup_module);
2506
2507 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2508 MODULE_LICENSE("GPL");
2509