0f19d540b655be900be7e946fd0838c77d95bb03
[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/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/trdevice.h>
34 #include <linux/fddidevice.h>
35 #include <linux/inetdevice.h>
36 #include <linux/in.h>
37 #include <linux/igmp.h>
38 #include <linux/delay.h>
39 #include <linux/kthread.h>
40 #include <linux/slab.h>
41 #include <net/arp.h>
42 #include <net/ip.h>
43
44 #include <asm/debug.h>
45 #include <asm/idals.h>
46 #include <asm/timex.h>
47 #include <linux/device.h>
48 #include <asm/ccwgroup.h>
49
50 #include "lcs.h"
51
52
53 #if !defined(CONFIG_NET_ETHERNET) && \
54     !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
55 #error Cannot compile lcs.c without some net devices switched on.
56 #endif
57
58 /**
59  * initialization string for output
60  */
61
62 static char version[] __initdata = "LCS driver";
63
64 /**
65   * the root device for lcs group devices
66   */
67 static struct device *lcs_root_dev;
68
69 /**
70  * Some prototypes.
71  */
72 static void lcs_tasklet(unsigned long);
73 static void lcs_start_kernel_thread(struct work_struct *);
74 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
75 #ifdef CONFIG_IP_MULTICAST
76 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
77 #endif /* CONFIG_IP_MULTICAST */
78 static int lcs_recovery(void *ptr);
79
80 /**
81  * Debug Facility Stuff
82  */
83 static char debug_buffer[255];
84 static debug_info_t *lcs_dbf_setup;
85 static debug_info_t *lcs_dbf_trace;
86
87 /**
88  *  LCS Debug Facility functions
89  */
90 static void
91 lcs_unregister_debug_facility(void)
92 {
93         if (lcs_dbf_setup)
94                 debug_unregister(lcs_dbf_setup);
95         if (lcs_dbf_trace)
96                 debug_unregister(lcs_dbf_trace);
97 }
98
99 static int
100 lcs_register_debug_facility(void)
101 {
102         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
103         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
104         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
105                 pr_err("Not enough memory for debug facility.\n");
106                 lcs_unregister_debug_facility();
107                 return -ENOMEM;
108         }
109         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
110         debug_set_level(lcs_dbf_setup, 2);
111         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
112         debug_set_level(lcs_dbf_trace, 2);
113         return 0;
114 }
115
116 /**
117  * Allocate io buffers.
118  */
119 static int
120 lcs_alloc_channel(struct lcs_channel *channel)
121 {
122         int cnt;
123
124         LCS_DBF_TEXT(2, setup, "ichalloc");
125         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
126                 /* alloc memory fo iobuffer */
127                 channel->iob[cnt].data =
128                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
129                 if (channel->iob[cnt].data == NULL)
130                         break;
131                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
132         }
133         if (cnt < LCS_NUM_BUFFS) {
134                 /* Not all io buffers could be allocated. */
135                 LCS_DBF_TEXT(2, setup, "echalloc");
136                 while (cnt-- > 0)
137                         kfree(channel->iob[cnt].data);
138                 return -ENOMEM;
139         }
140         return 0;
141 }
142
143 /**
144  * Free io buffers.
145  */
146 static void
147 lcs_free_channel(struct lcs_channel *channel)
148 {
149         int cnt;
150
151         LCS_DBF_TEXT(2, setup, "ichfree");
152         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
153                 kfree(channel->iob[cnt].data);
154                 channel->iob[cnt].data = NULL;
155         }
156 }
157
158 /*
159  * Cleanup channel.
160  */
161 static void
162 lcs_cleanup_channel(struct lcs_channel *channel)
163 {
164         LCS_DBF_TEXT(3, setup, "cleanch");
165         /* Kill write channel tasklets. */
166         tasklet_kill(&channel->irq_tasklet);
167         /* Free channel buffers. */
168         lcs_free_channel(channel);
169 }
170
171 /**
172  * LCS free memory for card and channels.
173  */
174 static void
175 lcs_free_card(struct lcs_card *card)
176 {
177         LCS_DBF_TEXT(2, setup, "remcard");
178         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
179         kfree(card);
180 }
181
182 /**
183  * LCS alloc memory for card and channels
184  */
185 static struct lcs_card *
186 lcs_alloc_card(void)
187 {
188         struct lcs_card *card;
189         int rc;
190
191         LCS_DBF_TEXT(2, setup, "alloclcs");
192
193         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
194         if (card == NULL)
195                 return NULL;
196         card->lan_type = LCS_FRAME_TYPE_AUTO;
197         card->pkt_seq = 0;
198         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
199         /* Allocate io buffers for the read channel. */
200         rc = lcs_alloc_channel(&card->read);
201         if (rc){
202                 LCS_DBF_TEXT(2, setup, "iccwerr");
203                 lcs_free_card(card);
204                 return NULL;
205         }
206         /* Allocate io buffers for the write channel. */
207         rc = lcs_alloc_channel(&card->write);
208         if (rc) {
209                 LCS_DBF_TEXT(2, setup, "iccwerr");
210                 lcs_cleanup_channel(&card->read);
211                 lcs_free_card(card);
212                 return NULL;
213         }
214
215 #ifdef CONFIG_IP_MULTICAST
216         INIT_LIST_HEAD(&card->ipm_list);
217 #endif
218         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
219         return card;
220 }
221
222 /*
223  * Setup read channel.
224  */
225 static void
226 lcs_setup_read_ccws(struct lcs_card *card)
227 {
228         int cnt;
229
230         LCS_DBF_TEXT(2, setup, "ireadccw");
231         /* Setup read ccws. */
232         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
233         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
234                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
235                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
236                 card->read.ccws[cnt].flags =
237                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
238                 /*
239                  * Note: we have allocated the buffer with GFP_DMA, so
240                  * we do not need to do set_normalized_cda.
241                  */
242                 card->read.ccws[cnt].cda =
243                         (__u32) __pa(card->read.iob[cnt].data);
244                 ((struct lcs_header *)
245                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
246                 card->read.iob[cnt].callback = lcs_get_frames_cb;
247                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
248                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
249         }
250         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
251         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
252         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
253         /* Last ccw is a tic (transfer in channel). */
254         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
255         card->read.ccws[LCS_NUM_BUFFS].cda =
256                 (__u32) __pa(card->read.ccws);
257         /* Setg initial state of the read channel. */
258         card->read.state = LCS_CH_STATE_INIT;
259
260         card->read.io_idx = 0;
261         card->read.buf_idx = 0;
262 }
263
264 static void
265 lcs_setup_read(struct lcs_card *card)
266 {
267         LCS_DBF_TEXT(3, setup, "initread");
268
269         lcs_setup_read_ccws(card);
270         /* Initialize read channel tasklet. */
271         card->read.irq_tasklet.data = (unsigned long) &card->read;
272         card->read.irq_tasklet.func = lcs_tasklet;
273         /* Initialize waitqueue. */
274         init_waitqueue_head(&card->read.wait_q);
275 }
276
277 /*
278  * Setup write channel.
279  */
280 static void
281 lcs_setup_write_ccws(struct lcs_card *card)
282 {
283         int cnt;
284
285         LCS_DBF_TEXT(3, setup, "iwritccw");
286         /* Setup write ccws. */
287         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
288         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
289                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
290                 card->write.ccws[cnt].count = 0;
291                 card->write.ccws[cnt].flags =
292                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
293                 /*
294                  * Note: we have allocated the buffer with GFP_DMA, so
295                  * we do not need to do set_normalized_cda.
296                  */
297                 card->write.ccws[cnt].cda =
298                         (__u32) __pa(card->write.iob[cnt].data);
299         }
300         /* Last ccw is a tic (transfer in channel). */
301         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
302         card->write.ccws[LCS_NUM_BUFFS].cda =
303                 (__u32) __pa(card->write.ccws);
304         /* Set initial state of the write channel. */
305         card->read.state = LCS_CH_STATE_INIT;
306
307         card->write.io_idx = 0;
308         card->write.buf_idx = 0;
309 }
310
311 static void
312 lcs_setup_write(struct lcs_card *card)
313 {
314         LCS_DBF_TEXT(3, setup, "initwrit");
315
316         lcs_setup_write_ccws(card);
317         /* Initialize write channel tasklet. */
318         card->write.irq_tasklet.data = (unsigned long) &card->write;
319         card->write.irq_tasklet.func = lcs_tasklet;
320         /* Initialize waitqueue. */
321         init_waitqueue_head(&card->write.wait_q);
322 }
323
324 static void
325 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
326 {
327         unsigned long flags;
328
329         spin_lock_irqsave(&card->mask_lock, flags);
330         card->thread_allowed_mask = threads;
331         spin_unlock_irqrestore(&card->mask_lock, flags);
332         wake_up(&card->wait_q);
333 }
334 static inline int
335 lcs_threads_running(struct lcs_card *card, unsigned long threads)
336 {
337         unsigned long flags;
338         int rc = 0;
339
340         spin_lock_irqsave(&card->mask_lock, flags);
341         rc = (card->thread_running_mask & threads);
342         spin_unlock_irqrestore(&card->mask_lock, flags);
343         return rc;
344 }
345
346 static int
347 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
348 {
349         return wait_event_interruptible(card->wait_q,
350                         lcs_threads_running(card, threads) == 0);
351 }
352
353 static inline int
354 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
355 {
356         unsigned long flags;
357
358         spin_lock_irqsave(&card->mask_lock, flags);
359         if ( !(card->thread_allowed_mask & thread) ||
360               (card->thread_start_mask & thread) ) {
361                 spin_unlock_irqrestore(&card->mask_lock, flags);
362                 return -EPERM;
363         }
364         card->thread_start_mask |= thread;
365         spin_unlock_irqrestore(&card->mask_lock, flags);
366         return 0;
367 }
368
369 static void
370 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
371 {
372         unsigned long flags;
373
374         spin_lock_irqsave(&card->mask_lock, flags);
375         card->thread_running_mask &= ~thread;
376         spin_unlock_irqrestore(&card->mask_lock, flags);
377         wake_up(&card->wait_q);
378 }
379
380 static inline int
381 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
382 {
383         unsigned long flags;
384         int rc = 0;
385
386         spin_lock_irqsave(&card->mask_lock, flags);
387         if (card->thread_start_mask & thread){
388                 if ((card->thread_allowed_mask & thread) &&
389                     !(card->thread_running_mask & thread)){
390                         rc = 1;
391                         card->thread_start_mask &= ~thread;
392                         card->thread_running_mask |= thread;
393                 } else
394                         rc = -EPERM;
395         }
396         spin_unlock_irqrestore(&card->mask_lock, flags);
397         return rc;
398 }
399
400 static int
401 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
402 {
403         int rc = 0;
404         wait_event(card->wait_q,
405                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
406         return rc;
407 }
408
409 static int
410 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
411 {
412         unsigned long flags;
413         int rc = 0;
414
415         spin_lock_irqsave(&card->mask_lock, flags);
416         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
417                         (u8) card->thread_start_mask,
418                         (u8) card->thread_allowed_mask,
419                         (u8) card->thread_running_mask);
420         rc = (card->thread_start_mask & thread);
421         spin_unlock_irqrestore(&card->mask_lock, flags);
422         return rc;
423 }
424
425 /**
426  * Initialize channels,card and state machines.
427  */
428 static void
429 lcs_setup_card(struct lcs_card *card)
430 {
431         LCS_DBF_TEXT(2, setup, "initcard");
432         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
433
434         lcs_setup_read(card);
435         lcs_setup_write(card);
436         /* Set cards initial state. */
437         card->state = DEV_STATE_DOWN;
438         card->tx_buffer = NULL;
439         card->tx_emitted = 0;
440
441         init_waitqueue_head(&card->wait_q);
442         spin_lock_init(&card->lock);
443         spin_lock_init(&card->ipm_lock);
444         spin_lock_init(&card->mask_lock);
445 #ifdef CONFIG_IP_MULTICAST
446         INIT_LIST_HEAD(&card->ipm_list);
447 #endif
448         INIT_LIST_HEAD(&card->lancmd_waiters);
449 }
450
451 static inline void
452 lcs_clear_multicast_list(struct lcs_card *card)
453 {
454 #ifdef  CONFIG_IP_MULTICAST
455         struct lcs_ipm_list *ipm;
456         unsigned long flags;
457
458         /* Free multicast list. */
459         LCS_DBF_TEXT(3, setup, "clmclist");
460         spin_lock_irqsave(&card->ipm_lock, flags);
461         while (!list_empty(&card->ipm_list)){
462                 ipm = list_entry(card->ipm_list.next,
463                                  struct lcs_ipm_list, list);
464                 list_del(&ipm->list);
465                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
466                         spin_unlock_irqrestore(&card->ipm_lock, flags);
467                         lcs_send_delipm(card, ipm);
468                         spin_lock_irqsave(&card->ipm_lock, flags);
469                 }
470                 kfree(ipm);
471         }
472         spin_unlock_irqrestore(&card->ipm_lock, flags);
473 #endif
474 }
475 /**
476  * Cleanup channels,card and state machines.
477  */
478 static void
479 lcs_cleanup_card(struct lcs_card *card)
480 {
481
482         LCS_DBF_TEXT(3, setup, "cleancrd");
483         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
484
485         if (card->dev != NULL)
486                 free_netdev(card->dev);
487         /* Cleanup channels. */
488         lcs_cleanup_channel(&card->write);
489         lcs_cleanup_channel(&card->read);
490 }
491
492 /**
493  * Start channel.
494  */
495 static int
496 lcs_start_channel(struct lcs_channel *channel)
497 {
498         unsigned long flags;
499         int rc;
500
501         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
502         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
503         rc = ccw_device_start(channel->ccwdev,
504                               channel->ccws + channel->io_idx, 0, 0,
505                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
506         if (rc == 0)
507                 channel->state = LCS_CH_STATE_RUNNING;
508         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
509         if (rc) {
510                 LCS_DBF_TEXT_(4,trace,"essh%s",
511                               dev_name(&channel->ccwdev->dev));
512                 dev_err(&channel->ccwdev->dev,
513                         "Starting an LCS device resulted in an error,"
514                         " rc=%d!\n", rc);
515         }
516         return rc;
517 }
518
519 static int
520 lcs_clear_channel(struct lcs_channel *channel)
521 {
522         unsigned long flags;
523         int rc;
524
525         LCS_DBF_TEXT(4,trace,"clearch");
526         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
527         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
528         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
529         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
530         if (rc) {
531                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
532                               dev_name(&channel->ccwdev->dev));
533                 return rc;
534         }
535         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
536         channel->state = LCS_CH_STATE_STOPPED;
537         return rc;
538 }
539
540
541 /**
542  * Stop channel.
543  */
544 static int
545 lcs_stop_channel(struct lcs_channel *channel)
546 {
547         unsigned long flags;
548         int rc;
549
550         if (channel->state == LCS_CH_STATE_STOPPED)
551                 return 0;
552         LCS_DBF_TEXT(4,trace,"haltsch");
553         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
554         channel->state = LCS_CH_STATE_INIT;
555         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
556         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
557         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
558         if (rc) {
559                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
560                               dev_name(&channel->ccwdev->dev));
561                 return rc;
562         }
563         /* Asynchronous halt initialted. Wait for its completion. */
564         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
565         lcs_clear_channel(channel);
566         return 0;
567 }
568
569 /**
570  * start read and write channel
571  */
572 static int
573 lcs_start_channels(struct lcs_card *card)
574 {
575         int rc;
576
577         LCS_DBF_TEXT(2, trace, "chstart");
578         /* start read channel */
579         rc = lcs_start_channel(&card->read);
580         if (rc)
581                 return rc;
582         /* start write channel */
583         rc = lcs_start_channel(&card->write);
584         if (rc)
585                 lcs_stop_channel(&card->read);
586         return rc;
587 }
588
589 /**
590  * stop read and write channel
591  */
592 static int
593 lcs_stop_channels(struct lcs_card *card)
594 {
595         LCS_DBF_TEXT(2, trace, "chhalt");
596         lcs_stop_channel(&card->read);
597         lcs_stop_channel(&card->write);
598         return 0;
599 }
600
601 /**
602  * Get empty buffer.
603  */
604 static struct lcs_buffer *
605 __lcs_get_buffer(struct lcs_channel *channel)
606 {
607         int index;
608
609         LCS_DBF_TEXT(5, trace, "_getbuff");
610         index = channel->io_idx;
611         do {
612                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
613                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
614                         return channel->iob + index;
615                 }
616                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
617         } while (index != channel->io_idx);
618         return NULL;
619 }
620
621 static struct lcs_buffer *
622 lcs_get_buffer(struct lcs_channel *channel)
623 {
624         struct lcs_buffer *buffer;
625         unsigned long flags;
626
627         LCS_DBF_TEXT(5, trace, "getbuff");
628         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
629         buffer = __lcs_get_buffer(channel);
630         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
631         return buffer;
632 }
633
634 /**
635  * Resume channel program if the channel is suspended.
636  */
637 static int
638 __lcs_resume_channel(struct lcs_channel *channel)
639 {
640         int rc;
641
642         if (channel->state != LCS_CH_STATE_SUSPENDED)
643                 return 0;
644         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
645                 return 0;
646         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
647         rc = ccw_device_resume(channel->ccwdev);
648         if (rc) {
649                 LCS_DBF_TEXT_(4, trace, "ersc%s",
650                               dev_name(&channel->ccwdev->dev));
651                 dev_err(&channel->ccwdev->dev,
652                         "Sending data from the LCS device to the LAN failed"
653                         " with rc=%d\n",rc);
654         } else
655                 channel->state = LCS_CH_STATE_RUNNING;
656         return rc;
657
658 }
659
660 /**
661  * Make a buffer ready for processing.
662  */
663 static inline void
664 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
665 {
666         int prev, next;
667
668         LCS_DBF_TEXT(5, trace, "rdybits");
669         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
670         next = (index + 1) & (LCS_NUM_BUFFS - 1);
671         /* Check if we may clear the suspend bit of this buffer. */
672         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
673                 /* Check if we have to set the PCI bit. */
674                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
675                         /* Suspend bit of the previous buffer is not set. */
676                         channel->ccws[index].flags |= CCW_FLAG_PCI;
677                 /* Suspend bit of the next buffer is set. */
678                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
679         }
680 }
681
682 static int
683 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
684 {
685         unsigned long flags;
686         int index, rc;
687
688         LCS_DBF_TEXT(5, trace, "rdybuff");
689         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
690                buffer->state != LCS_BUF_STATE_PROCESSED);
691         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
692         buffer->state = LCS_BUF_STATE_READY;
693         index = buffer - channel->iob;
694         /* Set length. */
695         channel->ccws[index].count = buffer->count;
696         /* Check relevant PCI/suspend bits. */
697         __lcs_ready_buffer_bits(channel, index);
698         rc = __lcs_resume_channel(channel);
699         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
700         return rc;
701 }
702
703 /**
704  * Mark the buffer as processed. Take care of the suspend bit
705  * of the previous buffer. This function is called from
706  * interrupt context, so the lock must not be taken.
707  */
708 static int
709 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
710 {
711         int index, prev, next;
712
713         LCS_DBF_TEXT(5, trace, "prcsbuff");
714         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
715         buffer->state = LCS_BUF_STATE_PROCESSED;
716         index = buffer - channel->iob;
717         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
718         next = (index + 1) & (LCS_NUM_BUFFS - 1);
719         /* Set the suspend bit and clear the PCI bit of this buffer. */
720         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
721         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
722         /* Check the suspend bit of the previous buffer. */
723         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
724                 /*
725                  * Previous buffer is in state ready. It might have
726                  * happened in lcs_ready_buffer that the suspend bit
727                  * has not been cleared to avoid an endless loop.
728                  * Do it now.
729                  */
730                 __lcs_ready_buffer_bits(channel, prev);
731         }
732         /* Clear PCI bit of next buffer. */
733         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
734         return __lcs_resume_channel(channel);
735 }
736
737 /**
738  * Put a processed buffer back to state empty.
739  */
740 static void
741 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
742 {
743         unsigned long flags;
744
745         LCS_DBF_TEXT(5, trace, "relbuff");
746         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
747                buffer->state != LCS_BUF_STATE_PROCESSED);
748         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
749         buffer->state = LCS_BUF_STATE_EMPTY;
750         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
751 }
752
753 /**
754  * Get buffer for a lan command.
755  */
756 static struct lcs_buffer *
757 lcs_get_lancmd(struct lcs_card *card, int count)
758 {
759         struct lcs_buffer *buffer;
760         struct lcs_cmd *cmd;
761
762         LCS_DBF_TEXT(4, trace, "getlncmd");
763         /* Get buffer and wait if none is available. */
764         wait_event(card->write.wait_q,
765                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
766         count += sizeof(struct lcs_header);
767         *(__u16 *)(buffer->data + count) = 0;
768         buffer->count = count + sizeof(__u16);
769         buffer->callback = lcs_release_buffer;
770         cmd = (struct lcs_cmd *) buffer->data;
771         cmd->offset = count;
772         cmd->type = LCS_FRAME_TYPE_CONTROL;
773         cmd->slot = 0;
774         return buffer;
775 }
776
777
778 static void
779 lcs_get_reply(struct lcs_reply *reply)
780 {
781         WARN_ON(atomic_read(&reply->refcnt) <= 0);
782         atomic_inc(&reply->refcnt);
783 }
784
785 static void
786 lcs_put_reply(struct lcs_reply *reply)
787 {
788         WARN_ON(atomic_read(&reply->refcnt) <= 0);
789         if (atomic_dec_and_test(&reply->refcnt)) {
790                 kfree(reply);
791         }
792
793 }
794
795 static struct lcs_reply *
796 lcs_alloc_reply(struct lcs_cmd *cmd)
797 {
798         struct lcs_reply *reply;
799
800         LCS_DBF_TEXT(4, trace, "getreply");
801
802         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
803         if (!reply)
804                 return NULL;
805         atomic_set(&reply->refcnt,1);
806         reply->sequence_no = cmd->sequence_no;
807         reply->received = 0;
808         reply->rc = 0;
809         init_waitqueue_head(&reply->wait_q);
810
811         return reply;
812 }
813
814 /**
815  * Notifier function for lancmd replies. Called from read irq.
816  */
817 static void
818 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
819 {
820         struct list_head *l, *n;
821         struct lcs_reply *reply;
822
823         LCS_DBF_TEXT(4, trace, "notiwait");
824         spin_lock(&card->lock);
825         list_for_each_safe(l, n, &card->lancmd_waiters) {
826                 reply = list_entry(l, struct lcs_reply, list);
827                 if (reply->sequence_no == cmd->sequence_no) {
828                         lcs_get_reply(reply);
829                         list_del_init(&reply->list);
830                         if (reply->callback != NULL)
831                                 reply->callback(card, cmd);
832                         reply->received = 1;
833                         reply->rc = cmd->return_code;
834                         wake_up(&reply->wait_q);
835                         lcs_put_reply(reply);
836                         break;
837                 }
838         }
839         spin_unlock(&card->lock);
840 }
841
842 /**
843  * Emit buffer of a lan comand.
844  */
845 static void
846 lcs_lancmd_timeout(unsigned long data)
847 {
848         struct lcs_reply *reply, *list_reply, *r;
849         unsigned long flags;
850
851         LCS_DBF_TEXT(4, trace, "timeout");
852         reply = (struct lcs_reply *) data;
853         spin_lock_irqsave(&reply->card->lock, flags);
854         list_for_each_entry_safe(list_reply, r,
855                                  &reply->card->lancmd_waiters,list) {
856                 if (reply == list_reply) {
857                         lcs_get_reply(reply);
858                         list_del_init(&reply->list);
859                         spin_unlock_irqrestore(&reply->card->lock, flags);
860                         reply->received = 1;
861                         reply->rc = -ETIME;
862                         wake_up(&reply->wait_q);
863                         lcs_put_reply(reply);
864                         return;
865                 }
866         }
867         spin_unlock_irqrestore(&reply->card->lock, flags);
868 }
869
870 static int
871 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
872                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
873 {
874         struct lcs_reply *reply;
875         struct lcs_cmd *cmd;
876         struct timer_list timer;
877         unsigned long flags;
878         int rc;
879
880         LCS_DBF_TEXT(4, trace, "sendcmd");
881         cmd = (struct lcs_cmd *) buffer->data;
882         cmd->return_code = 0;
883         cmd->sequence_no = card->sequence_no++;
884         reply = lcs_alloc_reply(cmd);
885         if (!reply)
886                 return -ENOMEM;
887         reply->callback = reply_callback;
888         reply->card = card;
889         spin_lock_irqsave(&card->lock, flags);
890         list_add_tail(&reply->list, &card->lancmd_waiters);
891         spin_unlock_irqrestore(&card->lock, flags);
892
893         buffer->callback = lcs_release_buffer;
894         rc = lcs_ready_buffer(&card->write, buffer);
895         if (rc)
896                 return rc;
897         init_timer_on_stack(&timer);
898         timer.function = lcs_lancmd_timeout;
899         timer.data = (unsigned long) reply;
900         timer.expires = jiffies + HZ*card->lancmd_timeout;
901         add_timer(&timer);
902         wait_event(reply->wait_q, reply->received);
903         del_timer_sync(&timer);
904         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
905         rc = reply->rc;
906         lcs_put_reply(reply);
907         return rc ? -EIO : 0;
908 }
909
910 /**
911  * LCS startup command
912  */
913 static int
914 lcs_send_startup(struct lcs_card *card, __u8 initiator)
915 {
916         struct lcs_buffer *buffer;
917         struct lcs_cmd *cmd;
918
919         LCS_DBF_TEXT(2, trace, "startup");
920         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
921         cmd = (struct lcs_cmd *) buffer->data;
922         cmd->cmd_code = LCS_CMD_STARTUP;
923         cmd->initiator = initiator;
924         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
925         return lcs_send_lancmd(card, buffer, NULL);
926 }
927
928 /**
929  * LCS shutdown command
930  */
931 static int
932 lcs_send_shutdown(struct lcs_card *card)
933 {
934         struct lcs_buffer *buffer;
935         struct lcs_cmd *cmd;
936
937         LCS_DBF_TEXT(2, trace, "shutdown");
938         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
939         cmd = (struct lcs_cmd *) buffer->data;
940         cmd->cmd_code = LCS_CMD_SHUTDOWN;
941         cmd->initiator = LCS_INITIATOR_TCPIP;
942         return lcs_send_lancmd(card, buffer, NULL);
943 }
944
945 /**
946  * LCS lanstat command
947  */
948 static void
949 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
950 {
951         LCS_DBF_TEXT(2, trace, "statcb");
952         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
953 }
954
955 static int
956 lcs_send_lanstat(struct lcs_card *card)
957 {
958         struct lcs_buffer *buffer;
959         struct lcs_cmd *cmd;
960
961         LCS_DBF_TEXT(2,trace, "cmdstat");
962         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
963         cmd = (struct lcs_cmd *) buffer->data;
964         /* Setup lanstat command. */
965         cmd->cmd_code = LCS_CMD_LANSTAT;
966         cmd->initiator = LCS_INITIATOR_TCPIP;
967         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
968         cmd->cmd.lcs_std_cmd.portno = card->portno;
969         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
970 }
971
972 /**
973  * send stoplan command
974  */
975 static int
976 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
977 {
978         struct lcs_buffer *buffer;
979         struct lcs_cmd *cmd;
980
981         LCS_DBF_TEXT(2, trace, "cmdstpln");
982         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
983         cmd = (struct lcs_cmd *) buffer->data;
984         cmd->cmd_code = LCS_CMD_STOPLAN;
985         cmd->initiator = initiator;
986         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
987         cmd->cmd.lcs_std_cmd.portno = card->portno;
988         return lcs_send_lancmd(card, buffer, NULL);
989 }
990
991 /**
992  * send startlan command
993  */
994 static void
995 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
996 {
997         LCS_DBF_TEXT(2, trace, "srtlancb");
998         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
999         card->portno = cmd->cmd.lcs_std_cmd.portno;
1000 }
1001
1002 static int
1003 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1004 {
1005         struct lcs_buffer *buffer;
1006         struct lcs_cmd *cmd;
1007
1008         LCS_DBF_TEXT(2, trace, "cmdstaln");
1009         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1010         cmd = (struct lcs_cmd *) buffer->data;
1011         cmd->cmd_code = LCS_CMD_STARTLAN;
1012         cmd->initiator = initiator;
1013         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1014         cmd->cmd.lcs_std_cmd.portno = card->portno;
1015         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /**
1020  * send setipm command (Multicast)
1021  */
1022 static int
1023 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1024 {
1025         struct lcs_buffer *buffer;
1026         struct lcs_cmd *cmd;
1027
1028         LCS_DBF_TEXT(2, trace, "cmdsetim");
1029         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1030         cmd = (struct lcs_cmd *) buffer->data;
1031         cmd->cmd_code = LCS_CMD_SETIPM;
1032         cmd->initiator = LCS_INITIATOR_TCPIP;
1033         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1034         cmd->cmd.lcs_qipassist.portno = card->portno;
1035         cmd->cmd.lcs_qipassist.version = 4;
1036         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1037         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1038                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1039         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1040         return lcs_send_lancmd(card, buffer, NULL);
1041 }
1042
1043 /**
1044  * send delipm command (Multicast)
1045  */
1046 static int
1047 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1048 {
1049         struct lcs_buffer *buffer;
1050         struct lcs_cmd *cmd;
1051
1052         LCS_DBF_TEXT(2, trace, "cmddelim");
1053         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1054         cmd = (struct lcs_cmd *) buffer->data;
1055         cmd->cmd_code = LCS_CMD_DELIPM;
1056         cmd->initiator = LCS_INITIATOR_TCPIP;
1057         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058         cmd->cmd.lcs_qipassist.portno = card->portno;
1059         cmd->cmd.lcs_qipassist.version = 4;
1060         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1062                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1063         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1064         return lcs_send_lancmd(card, buffer, NULL);
1065 }
1066
1067 /**
1068  * check if multicast is supported by LCS
1069  */
1070 static void
1071 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1072 {
1073         LCS_DBF_TEXT(2, trace, "chkmccb");
1074         card->ip_assists_supported =
1075                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1076         card->ip_assists_enabled =
1077                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1078 }
1079
1080 static int
1081 lcs_check_multicast_support(struct lcs_card *card)
1082 {
1083         struct lcs_buffer *buffer;
1084         struct lcs_cmd *cmd;
1085         int rc;
1086
1087         LCS_DBF_TEXT(2, trace, "cmdqipa");
1088         /* Send query ipassist. */
1089         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1090         cmd = (struct lcs_cmd *) buffer->data;
1091         cmd->cmd_code = LCS_CMD_QIPASSIST;
1092         cmd->initiator = LCS_INITIATOR_TCPIP;
1093         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1094         cmd->cmd.lcs_qipassist.portno = card->portno;
1095         cmd->cmd.lcs_qipassist.version = 4;
1096         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1097         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1098         if (rc != 0) {
1099                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1100                 return -EOPNOTSUPP;
1101         }
1102         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1103                 return 0;
1104         return -EOPNOTSUPP;
1105 }
1106
1107 /**
1108  * set or del multicast address on LCS card
1109  */
1110 static void
1111 lcs_fix_multicast_list(struct lcs_card *card)
1112 {
1113         struct list_head failed_list;
1114         struct lcs_ipm_list *ipm, *tmp;
1115         unsigned long flags;
1116         int rc;
1117
1118         LCS_DBF_TEXT(4,trace, "fixipm");
1119         INIT_LIST_HEAD(&failed_list);
1120         spin_lock_irqsave(&card->ipm_lock, flags);
1121 list_modified:
1122         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1123                 switch (ipm->ipm_state) {
1124                 case LCS_IPM_STATE_SET_REQUIRED:
1125                         /* del from ipm_list so noone else can tamper with
1126                          * this entry */
1127                         list_del_init(&ipm->list);
1128                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1129                         rc = lcs_send_setipm(card, ipm);
1130                         spin_lock_irqsave(&card->ipm_lock, flags);
1131                         if (rc) {
1132                                 pr_info("Adding multicast address failed."
1133                                         " Table possibly full!\n");
1134                                 /* store ipm in failed list -> will be added
1135                                  * to ipm_list again, so a retry will be done
1136                                  * during the next call of this function */
1137                                 list_add_tail(&ipm->list, &failed_list);
1138                         } else {
1139                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1140                                 /* re-insert into ipm_list */
1141                                 list_add_tail(&ipm->list, &card->ipm_list);
1142                         }
1143                         goto list_modified;
1144                 case LCS_IPM_STATE_DEL_REQUIRED:
1145                         list_del(&ipm->list);
1146                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1147                         lcs_send_delipm(card, ipm);
1148                         spin_lock_irqsave(&card->ipm_lock, flags);
1149                         kfree(ipm);
1150                         goto list_modified;
1151                 case LCS_IPM_STATE_ON_CARD:
1152                         break;
1153                 }
1154         }
1155         /* re-insert all entries from the failed_list into ipm_list */
1156         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1157                 list_move_tail(&ipm->list, &card->ipm_list);
1158
1159         spin_unlock_irqrestore(&card->ipm_lock, flags);
1160 }
1161
1162 /**
1163  * get mac address for the relevant Multicast address
1164  */
1165 static void
1166 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1167 {
1168         LCS_DBF_TEXT(4,trace, "getmac");
1169         if (dev->type == ARPHRD_IEEE802_TR)
1170                 ip_tr_mc_map(ipm, mac);
1171         else
1172                 ip_eth_mc_map(ipm, mac);
1173 }
1174
1175 /**
1176  * function called by net device to handle multicast address relevant things
1177  */
1178 static inline void
1179 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1180 {
1181         struct ip_mc_list *im4;
1182         struct list_head *l;
1183         struct lcs_ipm_list *ipm;
1184         unsigned long flags;
1185         char buf[MAX_ADDR_LEN];
1186
1187         LCS_DBF_TEXT(4, trace, "remmclst");
1188         spin_lock_irqsave(&card->ipm_lock, flags);
1189         list_for_each(l, &card->ipm_list) {
1190                 ipm = list_entry(l, struct lcs_ipm_list, list);
1191                 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1192                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1193                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1194                              (memcmp(buf, &ipm->ipm.mac_addr,
1195                                      LCS_MAC_LENGTH) == 0) )
1196                                 break;
1197                 }
1198                 if (im4 == NULL)
1199                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1200         }
1201         spin_unlock_irqrestore(&card->ipm_lock, flags);
1202 }
1203
1204 static inline struct lcs_ipm_list *
1205 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1206 {
1207         struct lcs_ipm_list *tmp, *ipm = NULL;
1208         struct list_head *l;
1209         unsigned long flags;
1210
1211         LCS_DBF_TEXT(4, trace, "chkmcent");
1212         spin_lock_irqsave(&card->ipm_lock, flags);
1213         list_for_each(l, &card->ipm_list) {
1214                 tmp = list_entry(l, struct lcs_ipm_list, list);
1215                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1216                      (memcmp(buf, &tmp->ipm.mac_addr,
1217                              LCS_MAC_LENGTH) == 0) ) {
1218                         ipm = tmp;
1219                         break;
1220                 }
1221         }
1222         spin_unlock_irqrestore(&card->ipm_lock, flags);
1223         return ipm;
1224 }
1225
1226 static inline void
1227 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1228 {
1229
1230         struct ip_mc_list *im4;
1231         struct lcs_ipm_list *ipm;
1232         char buf[MAX_ADDR_LEN];
1233         unsigned long flags;
1234
1235         LCS_DBF_TEXT(4, trace, "setmclst");
1236         for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1237                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1238                 ipm = lcs_check_addr_entry(card, im4, buf);
1239                 if (ipm != NULL)
1240                         continue;       /* Address already in list. */
1241                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1242                 if (ipm == NULL) {
1243                         pr_info("Not enough memory to add"
1244                                 " new multicast entry!\n");
1245                         break;
1246                 }
1247                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1248                 ipm->ipm.ip_addr = im4->multiaddr;
1249                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1250                 spin_lock_irqsave(&card->ipm_lock, flags);
1251                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1252                 list_add(&ipm->list, &card->ipm_list);
1253                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1254         }
1255 }
1256
1257 static int
1258 lcs_register_mc_addresses(void *data)
1259 {
1260         struct lcs_card *card;
1261         struct in_device *in4_dev;
1262
1263         card = (struct lcs_card *) data;
1264
1265         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1266                 return 0;
1267         LCS_DBF_TEXT(4, trace, "regmulti");
1268
1269         in4_dev = in_dev_get(card->dev);
1270         if (in4_dev == NULL)
1271                 goto out;
1272         read_lock(&in4_dev->mc_list_lock);
1273         lcs_remove_mc_addresses(card,in4_dev);
1274         lcs_set_mc_addresses(card, in4_dev);
1275         read_unlock(&in4_dev->mc_list_lock);
1276         in_dev_put(in4_dev);
1277
1278         netif_carrier_off(card->dev);
1279         netif_tx_disable(card->dev);
1280         wait_event(card->write.wait_q,
1281                         (card->write.state != LCS_CH_STATE_RUNNING));
1282         lcs_fix_multicast_list(card);
1283         if (card->state == DEV_STATE_UP) {
1284                 netif_carrier_on(card->dev);
1285                 netif_wake_queue(card->dev);
1286         }
1287 out:
1288         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1289         return 0;
1290 }
1291 #endif /* CONFIG_IP_MULTICAST */
1292
1293 /**
1294  * function called by net device to
1295  * handle multicast address relevant things
1296  */
1297 static void
1298 lcs_set_multicast_list(struct net_device *dev)
1299 {
1300 #ifdef CONFIG_IP_MULTICAST
1301         struct lcs_card *card;
1302
1303         LCS_DBF_TEXT(4, trace, "setmulti");
1304         card = (struct lcs_card *) dev->ml_priv;
1305
1306         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1307                 schedule_work(&card->kernel_thread_starter);
1308 #endif /* CONFIG_IP_MULTICAST */
1309 }
1310
1311 static long
1312 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1313 {
1314         if (!IS_ERR(irb))
1315                 return 0;
1316
1317         switch (PTR_ERR(irb)) {
1318         case -EIO:
1319                 dev_warn(&cdev->dev,
1320                         "An I/O-error occurred on the LCS device\n");
1321                 LCS_DBF_TEXT(2, trace, "ckirberr");
1322                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1323                 break;
1324         case -ETIMEDOUT:
1325                 dev_warn(&cdev->dev,
1326                         "A command timed out on the LCS device\n");
1327                 LCS_DBF_TEXT(2, trace, "ckirberr");
1328                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1329                 break;
1330         default:
1331                 dev_warn(&cdev->dev,
1332                         "An error occurred on the LCS device, rc=%ld\n",
1333                         PTR_ERR(irb));
1334                 LCS_DBF_TEXT(2, trace, "ckirberr");
1335                 LCS_DBF_TEXT(2, trace, "  rc???");
1336         }
1337         return PTR_ERR(irb);
1338 }
1339
1340 static int
1341 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1342 {
1343         int dstat, cstat;
1344         char *sense;
1345
1346         sense = (char *) irb->ecw;
1347         cstat = irb->scsw.cmd.cstat;
1348         dstat = irb->scsw.cmd.dstat;
1349
1350         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1351                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1352                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1353                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1354                 return 1;
1355         }
1356         if (dstat & DEV_STAT_UNIT_CHECK) {
1357                 if (sense[LCS_SENSE_BYTE_1] &
1358                     LCS_SENSE_RESETTING_EVENT) {
1359                         LCS_DBF_TEXT(2, trace, "REVIND");
1360                         return 1;
1361                 }
1362                 if (sense[LCS_SENSE_BYTE_0] &
1363                     LCS_SENSE_CMD_REJECT) {
1364                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1365                         return 0;
1366                 }
1367                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1368                     (!sense[LCS_SENSE_BYTE_1]) &&
1369                     (!sense[LCS_SENSE_BYTE_2]) &&
1370                     (!sense[LCS_SENSE_BYTE_3])) {
1371                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1372                         return 0;
1373                 }
1374                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1375                 return 1;
1376         }
1377         return 0;
1378 }
1379
1380 static void
1381 lcs_schedule_recovery(struct lcs_card *card)
1382 {
1383         LCS_DBF_TEXT(2, trace, "startrec");
1384         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1385                 schedule_work(&card->kernel_thread_starter);
1386 }
1387
1388 /**
1389  * IRQ Handler for LCS channels
1390  */
1391 static void
1392 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1393 {
1394         struct lcs_card *card;
1395         struct lcs_channel *channel;
1396         int rc, index;
1397         int cstat, dstat;
1398
1399         if (lcs_check_irb_error(cdev, irb))
1400                 return;
1401
1402         card = CARD_FROM_DEV(cdev);
1403         if (card->read.ccwdev == cdev)
1404                 channel = &card->read;
1405         else
1406                 channel = &card->write;
1407
1408         cstat = irb->scsw.cmd.cstat;
1409         dstat = irb->scsw.cmd.dstat;
1410         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1411         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1412                       irb->scsw.cmd.dstat);
1413         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1414                       irb->scsw.cmd.actl);
1415
1416         /* Check for channel and device errors presented */
1417         rc = lcs_get_problem(cdev, irb);
1418         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1419                 dev_warn(&cdev->dev,
1420                         "The LCS device stopped because of an error,"
1421                         " dstat=0x%X, cstat=0x%X \n",
1422                             dstat, cstat);
1423                 if (rc) {
1424                         channel->state = LCS_CH_STATE_ERROR;
1425                 }
1426         }
1427         if (channel->state == LCS_CH_STATE_ERROR) {
1428                 lcs_schedule_recovery(card);
1429                 wake_up(&card->wait_q);
1430                 return;
1431         }
1432         /* How far in the ccw chain have we processed? */
1433         if ((channel->state != LCS_CH_STATE_INIT) &&
1434             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1435             (irb->scsw.cmd.cpa != 0)) {
1436                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1437                         - channel->ccws;
1438                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1439                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1440                         /* Bloody io subsystem tells us lies about cpa... */
1441                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1442                 while (channel->io_idx != index) {
1443                         __lcs_processed_buffer(channel,
1444                                                channel->iob + channel->io_idx);
1445                         channel->io_idx =
1446                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1447                 }
1448         }
1449
1450         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1451             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1452             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1453                 /* Mark channel as stopped. */
1454                 channel->state = LCS_CH_STATE_STOPPED;
1455         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1456                 /* CCW execution stopped on a suspend bit. */
1457                 channel->state = LCS_CH_STATE_SUSPENDED;
1458         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1459                 if (irb->scsw.cmd.cc != 0) {
1460                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1461                         return;
1462                 }
1463                 /* The channel has been stopped by halt_IO. */
1464                 channel->state = LCS_CH_STATE_HALTED;
1465         }
1466         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1467                 channel->state = LCS_CH_STATE_CLEARED;
1468         /* Do the rest in the tasklet. */
1469         tasklet_schedule(&channel->irq_tasklet);
1470 }
1471
1472 /**
1473  * Tasklet for IRQ handler
1474  */
1475 static void
1476 lcs_tasklet(unsigned long data)
1477 {
1478         unsigned long flags;
1479         struct lcs_channel *channel;
1480         struct lcs_buffer *iob;
1481         int buf_idx;
1482         int rc;
1483
1484         channel = (struct lcs_channel *) data;
1485         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1486
1487         /* Check for processed buffers. */
1488         iob = channel->iob;
1489         buf_idx = channel->buf_idx;
1490         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1491                 /* Do the callback thing. */
1492                 if (iob[buf_idx].callback != NULL)
1493                         iob[buf_idx].callback(channel, iob + buf_idx);
1494                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1495         }
1496         channel->buf_idx = buf_idx;
1497
1498         if (channel->state == LCS_CH_STATE_STOPPED)
1499                 // FIXME: what if rc != 0 ??
1500                 rc = lcs_start_channel(channel);
1501         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1502         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1503             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1504                 // FIXME: what if rc != 0 ??
1505                 rc = __lcs_resume_channel(channel);
1506         }
1507         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1508
1509         /* Something happened on the channel. Wake up waiters. */
1510         wake_up(&channel->wait_q);
1511 }
1512
1513 /**
1514  * Finish current tx buffer and make it ready for transmit.
1515  */
1516 static void
1517 __lcs_emit_txbuffer(struct lcs_card *card)
1518 {
1519         LCS_DBF_TEXT(5, trace, "emittx");
1520         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1521         card->tx_buffer->count += 2;
1522         lcs_ready_buffer(&card->write, card->tx_buffer);
1523         card->tx_buffer = NULL;
1524         card->tx_emitted++;
1525 }
1526
1527 /**
1528  * Callback for finished tx buffers.
1529  */
1530 static void
1531 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1532 {
1533         struct lcs_card *card;
1534
1535         LCS_DBF_TEXT(5, trace, "txbuffcb");
1536         /* Put buffer back to pool. */
1537         lcs_release_buffer(channel, buffer);
1538         card = container_of(channel, struct lcs_card, write);
1539         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1540                 netif_wake_queue(card->dev);
1541         spin_lock(&card->lock);
1542         card->tx_emitted--;
1543         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1544                 /*
1545                  * Last running tx buffer has finished. Submit partially
1546                  * filled current buffer.
1547                  */
1548                 __lcs_emit_txbuffer(card);
1549         spin_unlock(&card->lock);
1550 }
1551
1552 /**
1553  * Packet transmit function called by network stack
1554  */
1555 static int
1556 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1557                  struct net_device *dev)
1558 {
1559         struct lcs_header *header;
1560         int rc = NETDEV_TX_OK;
1561
1562         LCS_DBF_TEXT(5, trace, "hardxmit");
1563         if (skb == NULL) {
1564                 card->stats.tx_dropped++;
1565                 card->stats.tx_errors++;
1566                 return NETDEV_TX_OK;
1567         }
1568         if (card->state != DEV_STATE_UP) {
1569                 dev_kfree_skb(skb);
1570                 card->stats.tx_dropped++;
1571                 card->stats.tx_errors++;
1572                 card->stats.tx_carrier_errors++;
1573                 return NETDEV_TX_OK;
1574         }
1575         if (skb->protocol == htons(ETH_P_IPV6)) {
1576                 dev_kfree_skb(skb);
1577                 return NETDEV_TX_OK;
1578         }
1579         netif_stop_queue(card->dev);
1580         spin_lock(&card->lock);
1581         if (card->tx_buffer != NULL &&
1582             card->tx_buffer->count + sizeof(struct lcs_header) +
1583             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1584                 /* skb too big for current tx buffer. */
1585                 __lcs_emit_txbuffer(card);
1586         if (card->tx_buffer == NULL) {
1587                 /* Get new tx buffer */
1588                 card->tx_buffer = lcs_get_buffer(&card->write);
1589                 if (card->tx_buffer == NULL) {
1590                         card->stats.tx_dropped++;
1591                         rc = NETDEV_TX_BUSY;
1592                         goto out;
1593                 }
1594                 card->tx_buffer->callback = lcs_txbuffer_cb;
1595                 card->tx_buffer->count = 0;
1596         }
1597         header = (struct lcs_header *)
1598                 (card->tx_buffer->data + card->tx_buffer->count);
1599         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1600         header->offset = card->tx_buffer->count;
1601         header->type = card->lan_type;
1602         header->slot = card->portno;
1603         skb_copy_from_linear_data(skb, header + 1, skb->len);
1604         spin_unlock(&card->lock);
1605         card->stats.tx_bytes += skb->len;
1606         card->stats.tx_packets++;
1607         dev_kfree_skb(skb);
1608         netif_wake_queue(card->dev);
1609         spin_lock(&card->lock);
1610         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1611                 /* If this is the first tx buffer emit it immediately. */
1612                 __lcs_emit_txbuffer(card);
1613 out:
1614         spin_unlock(&card->lock);
1615         return rc;
1616 }
1617
1618 static int
1619 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1620 {
1621         struct lcs_card *card;
1622         int rc;
1623
1624         LCS_DBF_TEXT(5, trace, "pktxmit");
1625         card = (struct lcs_card *) dev->ml_priv;
1626         rc = __lcs_start_xmit(card, skb, dev);
1627         return rc;
1628 }
1629
1630 /**
1631  * send startlan and lanstat command to make LCS device ready
1632  */
1633 static int
1634 lcs_startlan_auto(struct lcs_card *card)
1635 {
1636         int rc;
1637
1638         LCS_DBF_TEXT(2, trace, "strtauto");
1639 #ifdef CONFIG_NET_ETHERNET
1640         card->lan_type = LCS_FRAME_TYPE_ENET;
1641         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642         if (rc == 0)
1643                 return 0;
1644
1645 #endif
1646 #ifdef CONFIG_TR
1647         card->lan_type = LCS_FRAME_TYPE_TR;
1648         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1649         if (rc == 0)
1650                 return 0;
1651 #endif
1652 #ifdef CONFIG_FDDI
1653         card->lan_type = LCS_FRAME_TYPE_FDDI;
1654         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1655         if (rc == 0)
1656                 return 0;
1657 #endif
1658         return -EIO;
1659 }
1660
1661 static int
1662 lcs_startlan(struct lcs_card *card)
1663 {
1664         int rc, i;
1665
1666         LCS_DBF_TEXT(2, trace, "startlan");
1667         rc = 0;
1668         if (card->portno != LCS_INVALID_PORT_NO) {
1669                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1670                         rc = lcs_startlan_auto(card);
1671                 else
1672                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1673         } else {
1674                 for (i = 0; i <= 16; i++) {
1675                         card->portno = i;
1676                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1677                                 rc = lcs_send_startlan(card,
1678                                                        LCS_INITIATOR_TCPIP);
1679                         else
1680                                 /* autodetecting lan type */
1681                                 rc = lcs_startlan_auto(card);
1682                         if (rc == 0)
1683                                 break;
1684                 }
1685         }
1686         if (rc == 0)
1687                 return lcs_send_lanstat(card);
1688         return rc;
1689 }
1690
1691 /**
1692  * LCS detect function
1693  * setup channels and make them I/O ready
1694  */
1695 static int
1696 lcs_detect(struct lcs_card *card)
1697 {
1698         int rc = 0;
1699
1700         LCS_DBF_TEXT(2, setup, "lcsdetct");
1701         /* start/reset card */
1702         if (card->dev)
1703                 netif_stop_queue(card->dev);
1704         rc = lcs_stop_channels(card);
1705         if (rc == 0) {
1706                 rc = lcs_start_channels(card);
1707                 if (rc == 0) {
1708                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1709                         if (rc == 0)
1710                                 rc = lcs_startlan(card);
1711                 }
1712         }
1713         if (rc == 0) {
1714                 card->state = DEV_STATE_UP;
1715         } else {
1716                 card->state = DEV_STATE_DOWN;
1717                 card->write.state = LCS_CH_STATE_INIT;
1718                 card->read.state =  LCS_CH_STATE_INIT;
1719         }
1720         return rc;
1721 }
1722
1723 /**
1724  * LCS Stop card
1725  */
1726 static int
1727 lcs_stopcard(struct lcs_card *card)
1728 {
1729         int rc;
1730
1731         LCS_DBF_TEXT(3, setup, "stopcard");
1732
1733         if (card->read.state != LCS_CH_STATE_STOPPED &&
1734             card->write.state != LCS_CH_STATE_STOPPED &&
1735             card->read.state != LCS_CH_STATE_ERROR &&
1736             card->write.state != LCS_CH_STATE_ERROR &&
1737             card->state == DEV_STATE_UP) {
1738                 lcs_clear_multicast_list(card);
1739                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1740                 rc = lcs_send_shutdown(card);
1741         }
1742         rc = lcs_stop_channels(card);
1743         card->state = DEV_STATE_DOWN;
1744
1745         return rc;
1746 }
1747
1748 /**
1749  * Kernel Thread helper functions for LGW initiated commands
1750  */
1751 static void
1752 lcs_start_kernel_thread(struct work_struct *work)
1753 {
1754         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1755         LCS_DBF_TEXT(5, trace, "krnthrd");
1756         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1757                 kthread_run(lcs_recovery, card, "lcs_recover");
1758 #ifdef CONFIG_IP_MULTICAST
1759         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1760                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1761 #endif
1762 }
1763
1764 /**
1765  * Process control frames.
1766  */
1767 static void
1768 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1769 {
1770         LCS_DBF_TEXT(5, trace, "getctrl");
1771         if (cmd->initiator == LCS_INITIATOR_LGW) {
1772                 switch(cmd->cmd_code) {
1773                 case LCS_CMD_STARTUP:
1774                 case LCS_CMD_STARTLAN:
1775                         lcs_schedule_recovery(card);
1776                         break;
1777                 case LCS_CMD_STOPLAN:
1778                         pr_warning("Stoplan for %s initiated by LGW.\n",
1779                                    card->dev->name);
1780                         if (card->dev)
1781                                 netif_carrier_off(card->dev);
1782                         break;
1783                 default:
1784                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1785                         break;
1786                 }
1787         } else
1788                 lcs_notify_lancmd_waiters(card, cmd);
1789 }
1790
1791 /**
1792  * Unpack network packet.
1793  */
1794 static void
1795 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1796 {
1797         struct sk_buff *skb;
1798
1799         LCS_DBF_TEXT(5, trace, "getskb");
1800         if (card->dev == NULL ||
1801             card->state != DEV_STATE_UP)
1802                 /* The card isn't up. Ignore the packet. */
1803                 return;
1804
1805         skb = dev_alloc_skb(skb_len);
1806         if (skb == NULL) {
1807                 dev_err(&card->dev->dev,
1808                         " Allocating a socket buffer to interface %s failed\n",
1809                           card->dev->name);
1810                 card->stats.rx_dropped++;
1811                 return;
1812         }
1813         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1814         skb->protocol = card->lan_type_trans(skb, card->dev);
1815         card->stats.rx_bytes += skb_len;
1816         card->stats.rx_packets++;
1817         if (skb->protocol == htons(ETH_P_802_2))
1818                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1819         netif_rx(skb);
1820 }
1821
1822 /**
1823  * LCS main routine to get packets and lancmd replies from the buffers
1824  */
1825 static void
1826 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1827 {
1828         struct lcs_card *card;
1829         struct lcs_header *lcs_hdr;
1830         __u16 offset;
1831
1832         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1833         lcs_hdr = (struct lcs_header *) buffer->data;
1834         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1835                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1836                 return;
1837         }
1838         card = container_of(channel, struct lcs_card, read);
1839         offset = 0;
1840         while (lcs_hdr->offset != 0) {
1841                 if (lcs_hdr->offset <= 0 ||
1842                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1843                     lcs_hdr->offset < offset) {
1844                         /* Offset invalid. */
1845                         card->stats.rx_length_errors++;
1846                         card->stats.rx_errors++;
1847                         return;
1848                 }
1849                 /* What kind of frame is it? */
1850                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1851                         /* Control frame. */
1852                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1853                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1854                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1855                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1856                         /* Normal network packet. */
1857                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1858                                     lcs_hdr->offset - offset -
1859                                     sizeof(struct lcs_header));
1860                 else
1861                         /* Unknown frame type. */
1862                         ; // FIXME: error message ?
1863                 /* Proceed to next frame. */
1864                 offset = lcs_hdr->offset;
1865                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1866                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1867         }
1868         /* The buffer is now empty. Make it ready again. */
1869         lcs_ready_buffer(&card->read, buffer);
1870 }
1871
1872 /**
1873  * get network statistics for ifconfig and other user programs
1874  */
1875 static struct net_device_stats *
1876 lcs_getstats(struct net_device *dev)
1877 {
1878         struct lcs_card *card;
1879
1880         LCS_DBF_TEXT(4, trace, "netstats");
1881         card = (struct lcs_card *) dev->ml_priv;
1882         return &card->stats;
1883 }
1884
1885 /**
1886  * stop lcs device
1887  * This function will be called by user doing ifconfig xxx down
1888  */
1889 static int
1890 lcs_stop_device(struct net_device *dev)
1891 {
1892         struct lcs_card *card;
1893         int rc;
1894
1895         LCS_DBF_TEXT(2, trace, "stopdev");
1896         card   = (struct lcs_card *) dev->ml_priv;
1897         netif_carrier_off(dev);
1898         netif_tx_disable(dev);
1899         dev->flags &= ~IFF_UP;
1900         wait_event(card->write.wait_q,
1901                 (card->write.state != LCS_CH_STATE_RUNNING));
1902         rc = lcs_stopcard(card);
1903         if (rc)
1904                 dev_err(&card->dev->dev,
1905                         " Shutting down the LCS device failed\n ");
1906         return rc;
1907 }
1908
1909 /**
1910  * start lcs device and make it runnable
1911  * This function will be called by user doing ifconfig xxx up
1912  */
1913 static int
1914 lcs_open_device(struct net_device *dev)
1915 {
1916         struct lcs_card *card;
1917         int rc;
1918
1919         LCS_DBF_TEXT(2, trace, "opendev");
1920         card = (struct lcs_card *) dev->ml_priv;
1921         /* initialize statistics */
1922         rc = lcs_detect(card);
1923         if (rc) {
1924                 pr_err("Error in opening device!\n");
1925
1926         } else {
1927                 dev->flags |= IFF_UP;
1928                 netif_carrier_on(dev);
1929                 netif_wake_queue(dev);
1930                 card->state = DEV_STATE_UP;
1931         }
1932         return rc;
1933 }
1934
1935 /**
1936  * show function for portno called by cat or similar things
1937  */
1938 static ssize_t
1939 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1940 {
1941         struct lcs_card *card;
1942
1943         card = dev_get_drvdata(dev);
1944
1945         if (!card)
1946                 return 0;
1947
1948         return sprintf(buf, "%d\n", card->portno);
1949 }
1950
1951 /**
1952  * store the value which is piped to file portno
1953  */
1954 static ssize_t
1955 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1956 {
1957         struct lcs_card *card;
1958         int value;
1959
1960         card = dev_get_drvdata(dev);
1961
1962         if (!card)
1963                 return 0;
1964
1965         sscanf(buf, "%u", &value);
1966         /* TODO: sanity checks */
1967         card->portno = value;
1968
1969         return count;
1970
1971 }
1972
1973 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1974
1975 const char *lcs_type[] = {
1976         "not a channel",
1977         "2216 parallel",
1978         "2216 channel",
1979         "OSA LCS card",
1980         "unknown channel type",
1981         "unsupported channel type",
1982 };
1983
1984 static ssize_t
1985 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1986 {
1987         struct ccwgroup_device *cgdev;
1988
1989         cgdev = to_ccwgroupdev(dev);
1990         if (!cgdev)
1991                 return -ENODEV;
1992
1993         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1994 }
1995
1996 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1997
1998 static ssize_t
1999 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2000 {
2001         struct lcs_card *card;
2002
2003         card = dev_get_drvdata(dev);
2004
2005         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2006 }
2007
2008 static ssize_t
2009 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2010 {
2011         struct lcs_card *card;
2012         int value;
2013
2014         card = dev_get_drvdata(dev);
2015
2016         if (!card)
2017                 return 0;
2018
2019         sscanf(buf, "%u", &value);
2020         /* TODO: sanity checks */
2021         card->lancmd_timeout = value;
2022
2023         return count;
2024
2025 }
2026
2027 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2028
2029 static ssize_t
2030 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2031                       const char *buf, size_t count)
2032 {
2033         struct lcs_card *card = dev_get_drvdata(dev);
2034         char *tmp;
2035         int i;
2036
2037         if (!card)
2038                 return -EINVAL;
2039         if (card->state != DEV_STATE_UP)
2040                 return -EPERM;
2041         i = simple_strtoul(buf, &tmp, 16);
2042         if (i == 1)
2043                 lcs_schedule_recovery(card);
2044         return count;
2045 }
2046
2047 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2048
2049 static struct attribute * lcs_attrs[] = {
2050         &dev_attr_portno.attr,
2051         &dev_attr_type.attr,
2052         &dev_attr_lancmd_timeout.attr,
2053         &dev_attr_recover.attr,
2054         NULL,
2055 };
2056
2057 static struct attribute_group lcs_attr_group = {
2058         .attrs = lcs_attrs,
2059 };
2060
2061 /**
2062  * lcs_probe_device is called on establishing a new ccwgroup_device.
2063  */
2064 static int
2065 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2066 {
2067         struct lcs_card *card;
2068         int ret;
2069
2070         if (!get_device(&ccwgdev->dev))
2071                 return -ENODEV;
2072
2073         LCS_DBF_TEXT(2, setup, "add_dev");
2074         card = lcs_alloc_card();
2075         if (!card) {
2076                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2077                 put_device(&ccwgdev->dev);
2078                 return -ENOMEM;
2079         }
2080         ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2081         if (ret) {
2082                 lcs_free_card(card);
2083                 put_device(&ccwgdev->dev);
2084                 return ret;
2085         }
2086         dev_set_drvdata(&ccwgdev->dev, card);
2087         ccwgdev->cdev[0]->handler = lcs_irq;
2088         ccwgdev->cdev[1]->handler = lcs_irq;
2089         card->gdev = ccwgdev;
2090         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2091         card->thread_start_mask = 0;
2092         card->thread_allowed_mask = 0;
2093         card->thread_running_mask = 0;
2094         return 0;
2095 }
2096
2097 static int
2098 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2099 {
2100         struct lcs_card *card;
2101
2102         LCS_DBF_TEXT(2, setup, "regnetdv");
2103         card = dev_get_drvdata(&ccwgdev->dev);
2104         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2105                 return 0;
2106         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2107         return register_netdev(card->dev);
2108 }
2109
2110 /**
2111  * lcs_new_device will be called by setting the group device online.
2112  */
2113 static const struct net_device_ops lcs_netdev_ops = {
2114         .ndo_open               = lcs_open_device,
2115         .ndo_stop               = lcs_stop_device,
2116         .ndo_get_stats          = lcs_getstats,
2117         .ndo_start_xmit         = lcs_start_xmit,
2118 };
2119
2120 static const struct net_device_ops lcs_mc_netdev_ops = {
2121         .ndo_open               = lcs_open_device,
2122         .ndo_stop               = lcs_stop_device,
2123         .ndo_get_stats          = lcs_getstats,
2124         .ndo_start_xmit         = lcs_start_xmit,
2125         .ndo_set_multicast_list = lcs_set_multicast_list,
2126 };
2127
2128 static int
2129 lcs_new_device(struct ccwgroup_device *ccwgdev)
2130 {
2131         struct  lcs_card *card;
2132         struct net_device *dev=NULL;
2133         enum lcs_dev_states recover_state;
2134         int rc;
2135
2136         card = dev_get_drvdata(&ccwgdev->dev);
2137         if (!card)
2138                 return -ENODEV;
2139
2140         LCS_DBF_TEXT(2, setup, "newdev");
2141         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2142         card->read.ccwdev  = ccwgdev->cdev[0];
2143         card->write.ccwdev = ccwgdev->cdev[1];
2144
2145         recover_state = card->state;
2146         rc = ccw_device_set_online(card->read.ccwdev);
2147         if (rc)
2148                 goto out_err;
2149         rc = ccw_device_set_online(card->write.ccwdev);
2150         if (rc)
2151                 goto out_werr;
2152
2153         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2154
2155         lcs_setup_card(card);
2156         rc = lcs_detect(card);
2157         if (rc) {
2158                 LCS_DBF_TEXT(2, setup, "dtctfail");
2159                 dev_err(&card->dev->dev,
2160                         "Detecting a network adapter for LCS devices"
2161                         " failed with rc=%d (0x%x)\n", rc, rc);
2162                 lcs_stopcard(card);
2163                 goto out;
2164         }
2165         if (card->dev) {
2166                 LCS_DBF_TEXT(2, setup, "samedev");
2167                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2168                 goto netdev_out;
2169         }
2170         switch (card->lan_type) {
2171 #ifdef CONFIG_NET_ETHERNET
2172         case LCS_FRAME_TYPE_ENET:
2173                 card->lan_type_trans = eth_type_trans;
2174                 dev = alloc_etherdev(0);
2175                 break;
2176 #endif
2177 #ifdef CONFIG_TR
2178         case LCS_FRAME_TYPE_TR:
2179                 card->lan_type_trans = tr_type_trans;
2180                 dev = alloc_trdev(0);
2181                 break;
2182 #endif
2183 #ifdef CONFIG_FDDI
2184         case LCS_FRAME_TYPE_FDDI:
2185                 card->lan_type_trans = fddi_type_trans;
2186                 dev = alloc_fddidev(0);
2187                 break;
2188 #endif
2189         default:
2190                 LCS_DBF_TEXT(3, setup, "errinit");
2191                 pr_err(" Initialization failed\n");
2192                 goto out;
2193         }
2194         if (!dev)
2195                 goto out;
2196         card->dev = dev;
2197         card->dev->ml_priv = card;
2198         card->dev->netdev_ops = &lcs_netdev_ops;
2199         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2200 #ifdef CONFIG_IP_MULTICAST
2201         if (!lcs_check_multicast_support(card))
2202                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2203 #endif
2204 netdev_out:
2205         lcs_set_allowed_threads(card,0xffffffff);
2206         if (recover_state == DEV_STATE_RECOVER) {
2207                 lcs_set_multicast_list(card->dev);
2208                 card->dev->flags |= IFF_UP;
2209                 netif_carrier_on(card->dev);
2210                 netif_wake_queue(card->dev);
2211                 card->state = DEV_STATE_UP;
2212         } else {
2213                 lcs_stopcard(card);
2214         }
2215
2216         if (lcs_register_netdev(ccwgdev) != 0)
2217                 goto out;
2218
2219         /* Print out supported assists: IPv6 */
2220         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2221                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2222                 "with" : "without");
2223         /* Print out supported assist: Multicast */
2224         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2225                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2226                 "with" : "without");
2227         return 0;
2228 out:
2229
2230         ccw_device_set_offline(card->write.ccwdev);
2231 out_werr:
2232         ccw_device_set_offline(card->read.ccwdev);
2233 out_err:
2234         return -ENODEV;
2235 }
2236
2237 /**
2238  * lcs_shutdown_device, called when setting the group device offline.
2239  */
2240 static int
2241 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2242 {
2243         struct lcs_card *card;
2244         enum lcs_dev_states recover_state;
2245         int ret;
2246
2247         LCS_DBF_TEXT(3, setup, "shtdndev");
2248         card = dev_get_drvdata(&ccwgdev->dev);
2249         if (!card)
2250                 return -ENODEV;
2251         if (recovery_mode == 0) {
2252                 lcs_set_allowed_threads(card, 0);
2253                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2254                         return -ERESTARTSYS;
2255         }
2256         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2257         recover_state = card->state;
2258
2259         ret = lcs_stop_device(card->dev);
2260         ret = ccw_device_set_offline(card->read.ccwdev);
2261         ret = ccw_device_set_offline(card->write.ccwdev);
2262         if (recover_state == DEV_STATE_UP) {
2263                 card->state = DEV_STATE_RECOVER;
2264         }
2265         if (ret)
2266                 return ret;
2267         return 0;
2268 }
2269
2270 static int
2271 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2272 {
2273         return __lcs_shutdown_device(ccwgdev, 0);
2274 }
2275
2276 /**
2277  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2278  */
2279 static int
2280 lcs_recovery(void *ptr)
2281 {
2282         struct lcs_card *card;
2283         struct ccwgroup_device *gdev;
2284         int rc;
2285
2286         card = (struct lcs_card *) ptr;
2287
2288         LCS_DBF_TEXT(4, trace, "recover1");
2289         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2290                 return 0;
2291         LCS_DBF_TEXT(4, trace, "recover2");
2292         gdev = card->gdev;
2293         dev_warn(&gdev->dev,
2294                 "A recovery process has been started for the LCS device\n");
2295         rc = __lcs_shutdown_device(gdev, 1);
2296         rc = lcs_new_device(gdev);
2297         if (!rc)
2298                 pr_info("Device %s successfully recovered!\n",
2299                         card->dev->name);
2300         else
2301                 pr_info("Device %s could not be recovered!\n",
2302                         card->dev->name);
2303         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2304         return 0;
2305 }
2306
2307 /**
2308  * lcs_remove_device, free buffers and card
2309  */
2310 static void
2311 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2312 {
2313         struct lcs_card *card;
2314
2315         card = dev_get_drvdata(&ccwgdev->dev);
2316         if (!card)
2317                 return;
2318
2319         LCS_DBF_TEXT(3, setup, "remdev");
2320         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2321         if (ccwgdev->state == CCWGROUP_ONLINE) {
2322                 lcs_shutdown_device(ccwgdev);
2323         }
2324         if (card->dev)
2325                 unregister_netdev(card->dev);
2326         sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2327         lcs_cleanup_card(card);
2328         lcs_free_card(card);
2329         put_device(&ccwgdev->dev);
2330 }
2331
2332 static int lcs_pm_suspend(struct lcs_card *card)
2333 {
2334         if (card->dev)
2335                 netif_device_detach(card->dev);
2336         lcs_set_allowed_threads(card, 0);
2337         lcs_wait_for_threads(card, 0xffffffff);
2338         if (card->state != DEV_STATE_DOWN)
2339                 __lcs_shutdown_device(card->gdev, 1);
2340         return 0;
2341 }
2342
2343 static int lcs_pm_resume(struct lcs_card *card)
2344 {
2345         int rc = 0;
2346
2347         if (card->state == DEV_STATE_RECOVER)
2348                 rc = lcs_new_device(card->gdev);
2349         if (card->dev)
2350                 netif_device_attach(card->dev);
2351         if (rc) {
2352                 dev_warn(&card->gdev->dev, "The lcs device driver "
2353                         "failed to recover the device\n");
2354         }
2355         return rc;
2356 }
2357
2358 static int lcs_prepare(struct ccwgroup_device *gdev)
2359 {
2360         return 0;
2361 }
2362
2363 static void lcs_complete(struct ccwgroup_device *gdev)
2364 {
2365         return;
2366 }
2367
2368 static int lcs_freeze(struct ccwgroup_device *gdev)
2369 {
2370         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2371         return lcs_pm_suspend(card);
2372 }
2373
2374 static int lcs_thaw(struct ccwgroup_device *gdev)
2375 {
2376         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2377         return lcs_pm_resume(card);
2378 }
2379
2380 static int lcs_restore(struct ccwgroup_device *gdev)
2381 {
2382         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2383         return lcs_pm_resume(card);
2384 }
2385
2386 static struct ccw_device_id lcs_ids[] = {
2387         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2388         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2389         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2390         {},
2391 };
2392 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2393
2394 static struct ccw_driver lcs_ccw_driver = {
2395         .owner  = THIS_MODULE,
2396         .name   = "lcs",
2397         .ids    = lcs_ids,
2398         .probe  = ccwgroup_probe_ccwdev,
2399         .remove = ccwgroup_remove_ccwdev,
2400 };
2401
2402 /**
2403  * LCS ccwgroup driver registration
2404  */
2405 static struct ccwgroup_driver lcs_group_driver = {
2406         .owner       = THIS_MODULE,
2407         .name        = "lcs",
2408         .max_slaves  = 2,
2409         .driver_id   = 0xD3C3E2,
2410         .probe       = lcs_probe_device,
2411         .remove      = lcs_remove_device,
2412         .set_online  = lcs_new_device,
2413         .set_offline = lcs_shutdown_device,
2414         .prepare     = lcs_prepare,
2415         .complete    = lcs_complete,
2416         .freeze      = lcs_freeze,
2417         .thaw        = lcs_thaw,
2418         .restore     = lcs_restore,
2419 };
2420
2421 static ssize_t
2422 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2423                        size_t count)
2424 {
2425         int err;
2426         err = ccwgroup_create_from_string(lcs_root_dev,
2427                                           lcs_group_driver.driver_id,
2428                                           &lcs_ccw_driver, 2, buf);
2429         return err ? err : count;
2430 }
2431
2432 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2433
2434 static struct attribute *lcs_group_attrs[] = {
2435         &driver_attr_group.attr,
2436         NULL,
2437 };
2438
2439 static struct attribute_group lcs_group_attr_group = {
2440         .attrs = lcs_group_attrs,
2441 };
2442
2443 static const struct attribute_group *lcs_group_attr_groups[] = {
2444         &lcs_group_attr_group,
2445         NULL,
2446 };
2447
2448 /**
2449  *  LCS Module/Kernel initialization function
2450  */
2451 static int
2452 __init lcs_init_module(void)
2453 {
2454         int rc;
2455
2456         pr_info("Loading %s\n", version);
2457         rc = lcs_register_debug_facility();
2458         LCS_DBF_TEXT(0, setup, "lcsinit");
2459         if (rc)
2460                 goto out_err;
2461         lcs_root_dev = root_device_register("lcs");
2462         rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2463         if (rc)
2464                 goto register_err;
2465         rc = ccw_driver_register(&lcs_ccw_driver);
2466         if (rc)
2467                 goto ccw_err;
2468         lcs_group_driver.driver.groups = lcs_group_attr_groups;
2469         rc = ccwgroup_driver_register(&lcs_group_driver);
2470         if (rc)
2471                 goto ccwgroup_err;
2472         return 0;
2473
2474 ccwgroup_err:
2475         ccw_driver_unregister(&lcs_ccw_driver);
2476 ccw_err:
2477         root_device_unregister(lcs_root_dev);
2478 register_err:
2479         lcs_unregister_debug_facility();
2480 out_err:
2481         pr_err("Initializing the lcs device driver failed\n");
2482         return rc;
2483 }
2484
2485
2486 /**
2487  *  LCS module cleanup function
2488  */
2489 static void
2490 __exit lcs_cleanup_module(void)
2491 {
2492         pr_info("Terminating lcs module.\n");
2493         LCS_DBF_TEXT(0, trace, "cleanup");
2494         driver_remove_file(&lcs_group_driver.driver,
2495                            &driver_attr_group);
2496         ccwgroup_driver_unregister(&lcs_group_driver);
2497         ccw_driver_unregister(&lcs_ccw_driver);
2498         root_device_unregister(lcs_root_dev);
2499         lcs_unregister_debug_facility();
2500 }
2501
2502 module_init(lcs_init_module);
2503 module_exit(lcs_cleanup_module);
2504
2505 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2506 MODULE_LICENSE("GPL");
2507