Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
[linux-3.10.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/fddidevice.h>
34 #include <linux/inetdevice.h>
35 #include <linux/in.h>
36 #include <linux/igmp.h>
37 #include <linux/delay.h>
38 #include <linux/kthread.h>
39 #include <linux/slab.h>
40 #include <net/arp.h>
41 #include <net/ip.h>
42
43 #include <asm/debug.h>
44 #include <asm/idals.h>
45 #include <asm/timex.h>
46 #include <linux/device.h>
47 #include <asm/ccwgroup.h>
48
49 #include "lcs.h"
50
51
52 #if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
53 #error Cannot compile lcs.c without some net devices switched on.
54 #endif
55
56 /**
57  * initialization string for output
58  */
59
60 static char version[] __initdata = "LCS driver";
61
62 /**
63   * the root device for lcs group devices
64   */
65 static struct device *lcs_root_dev;
66
67 /**
68  * Some prototypes.
69  */
70 static void lcs_tasklet(unsigned long);
71 static void lcs_start_kernel_thread(struct work_struct *);
72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
73 #ifdef CONFIG_IP_MULTICAST
74 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
75 #endif /* CONFIG_IP_MULTICAST */
76 static int lcs_recovery(void *ptr);
77
78 /**
79  * Debug Facility Stuff
80  */
81 static char debug_buffer[255];
82 static debug_info_t *lcs_dbf_setup;
83 static debug_info_t *lcs_dbf_trace;
84
85 /**
86  *  LCS Debug Facility functions
87  */
88 static void
89 lcs_unregister_debug_facility(void)
90 {
91         if (lcs_dbf_setup)
92                 debug_unregister(lcs_dbf_setup);
93         if (lcs_dbf_trace)
94                 debug_unregister(lcs_dbf_trace);
95 }
96
97 static int
98 lcs_register_debug_facility(void)
99 {
100         lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
101         lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
102         if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
103                 pr_err("Not enough memory for debug facility.\n");
104                 lcs_unregister_debug_facility();
105                 return -ENOMEM;
106         }
107         debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
108         debug_set_level(lcs_dbf_setup, 2);
109         debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
110         debug_set_level(lcs_dbf_trace, 2);
111         return 0;
112 }
113
114 /**
115  * Allocate io buffers.
116  */
117 static int
118 lcs_alloc_channel(struct lcs_channel *channel)
119 {
120         int cnt;
121
122         LCS_DBF_TEXT(2, setup, "ichalloc");
123         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
124                 /* alloc memory fo iobuffer */
125                 channel->iob[cnt].data =
126                         kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
127                 if (channel->iob[cnt].data == NULL)
128                         break;
129                 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
130         }
131         if (cnt < LCS_NUM_BUFFS) {
132                 /* Not all io buffers could be allocated. */
133                 LCS_DBF_TEXT(2, setup, "echalloc");
134                 while (cnt-- > 0)
135                         kfree(channel->iob[cnt].data);
136                 return -ENOMEM;
137         }
138         return 0;
139 }
140
141 /**
142  * Free io buffers.
143  */
144 static void
145 lcs_free_channel(struct lcs_channel *channel)
146 {
147         int cnt;
148
149         LCS_DBF_TEXT(2, setup, "ichfree");
150         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
151                 kfree(channel->iob[cnt].data);
152                 channel->iob[cnt].data = NULL;
153         }
154 }
155
156 /*
157  * Cleanup channel.
158  */
159 static void
160 lcs_cleanup_channel(struct lcs_channel *channel)
161 {
162         LCS_DBF_TEXT(3, setup, "cleanch");
163         /* Kill write channel tasklets. */
164         tasklet_kill(&channel->irq_tasklet);
165         /* Free channel buffers. */
166         lcs_free_channel(channel);
167 }
168
169 /**
170  * LCS free memory for card and channels.
171  */
172 static void
173 lcs_free_card(struct lcs_card *card)
174 {
175         LCS_DBF_TEXT(2, setup, "remcard");
176         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
177         kfree(card);
178 }
179
180 /**
181  * LCS alloc memory for card and channels
182  */
183 static struct lcs_card *
184 lcs_alloc_card(void)
185 {
186         struct lcs_card *card;
187         int rc;
188
189         LCS_DBF_TEXT(2, setup, "alloclcs");
190
191         card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
192         if (card == NULL)
193                 return NULL;
194         card->lan_type = LCS_FRAME_TYPE_AUTO;
195         card->pkt_seq = 0;
196         card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
197         /* Allocate io buffers for the read channel. */
198         rc = lcs_alloc_channel(&card->read);
199         if (rc){
200                 LCS_DBF_TEXT(2, setup, "iccwerr");
201                 lcs_free_card(card);
202                 return NULL;
203         }
204         /* Allocate io buffers for the write channel. */
205         rc = lcs_alloc_channel(&card->write);
206         if (rc) {
207                 LCS_DBF_TEXT(2, setup, "iccwerr");
208                 lcs_cleanup_channel(&card->read);
209                 lcs_free_card(card);
210                 return NULL;
211         }
212
213 #ifdef CONFIG_IP_MULTICAST
214         INIT_LIST_HEAD(&card->ipm_list);
215 #endif
216         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
217         return card;
218 }
219
220 /*
221  * Setup read channel.
222  */
223 static void
224 lcs_setup_read_ccws(struct lcs_card *card)
225 {
226         int cnt;
227
228         LCS_DBF_TEXT(2, setup, "ireadccw");
229         /* Setup read ccws. */
230         memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
231         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
232                 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
233                 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
234                 card->read.ccws[cnt].flags =
235                         CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
236                 /*
237                  * Note: we have allocated the buffer with GFP_DMA, so
238                  * we do not need to do set_normalized_cda.
239                  */
240                 card->read.ccws[cnt].cda =
241                         (__u32) __pa(card->read.iob[cnt].data);
242                 ((struct lcs_header *)
243                  card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
244                 card->read.iob[cnt].callback = lcs_get_frames_cb;
245                 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
246                 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
247         }
248         card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
249         card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
250         card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
251         /* Last ccw is a tic (transfer in channel). */
252         card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
253         card->read.ccws[LCS_NUM_BUFFS].cda =
254                 (__u32) __pa(card->read.ccws);
255         /* Setg initial state of the read channel. */
256         card->read.state = LCS_CH_STATE_INIT;
257
258         card->read.io_idx = 0;
259         card->read.buf_idx = 0;
260 }
261
262 static void
263 lcs_setup_read(struct lcs_card *card)
264 {
265         LCS_DBF_TEXT(3, setup, "initread");
266
267         lcs_setup_read_ccws(card);
268         /* Initialize read channel tasklet. */
269         card->read.irq_tasklet.data = (unsigned long) &card->read;
270         card->read.irq_tasklet.func = lcs_tasklet;
271         /* Initialize waitqueue. */
272         init_waitqueue_head(&card->read.wait_q);
273 }
274
275 /*
276  * Setup write channel.
277  */
278 static void
279 lcs_setup_write_ccws(struct lcs_card *card)
280 {
281         int cnt;
282
283         LCS_DBF_TEXT(3, setup, "iwritccw");
284         /* Setup write ccws. */
285         memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
286         for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
287                 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
288                 card->write.ccws[cnt].count = 0;
289                 card->write.ccws[cnt].flags =
290                         CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
291                 /*
292                  * Note: we have allocated the buffer with GFP_DMA, so
293                  * we do not need to do set_normalized_cda.
294                  */
295                 card->write.ccws[cnt].cda =
296                         (__u32) __pa(card->write.iob[cnt].data);
297         }
298         /* Last ccw is a tic (transfer in channel). */
299         card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
300         card->write.ccws[LCS_NUM_BUFFS].cda =
301                 (__u32) __pa(card->write.ccws);
302         /* Set initial state of the write channel. */
303         card->read.state = LCS_CH_STATE_INIT;
304
305         card->write.io_idx = 0;
306         card->write.buf_idx = 0;
307 }
308
309 static void
310 lcs_setup_write(struct lcs_card *card)
311 {
312         LCS_DBF_TEXT(3, setup, "initwrit");
313
314         lcs_setup_write_ccws(card);
315         /* Initialize write channel tasklet. */
316         card->write.irq_tasklet.data = (unsigned long) &card->write;
317         card->write.irq_tasklet.func = lcs_tasklet;
318         /* Initialize waitqueue. */
319         init_waitqueue_head(&card->write.wait_q);
320 }
321
322 static void
323 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
324 {
325         unsigned long flags;
326
327         spin_lock_irqsave(&card->mask_lock, flags);
328         card->thread_allowed_mask = threads;
329         spin_unlock_irqrestore(&card->mask_lock, flags);
330         wake_up(&card->wait_q);
331 }
332 static inline int
333 lcs_threads_running(struct lcs_card *card, unsigned long threads)
334 {
335         unsigned long flags;
336         int rc = 0;
337
338         spin_lock_irqsave(&card->mask_lock, flags);
339         rc = (card->thread_running_mask & threads);
340         spin_unlock_irqrestore(&card->mask_lock, flags);
341         return rc;
342 }
343
344 static int
345 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
346 {
347         return wait_event_interruptible(card->wait_q,
348                         lcs_threads_running(card, threads) == 0);
349 }
350
351 static inline int
352 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
353 {
354         unsigned long flags;
355
356         spin_lock_irqsave(&card->mask_lock, flags);
357         if ( !(card->thread_allowed_mask & thread) ||
358               (card->thread_start_mask & thread) ) {
359                 spin_unlock_irqrestore(&card->mask_lock, flags);
360                 return -EPERM;
361         }
362         card->thread_start_mask |= thread;
363         spin_unlock_irqrestore(&card->mask_lock, flags);
364         return 0;
365 }
366
367 static void
368 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
369 {
370         unsigned long flags;
371
372         spin_lock_irqsave(&card->mask_lock, flags);
373         card->thread_running_mask &= ~thread;
374         spin_unlock_irqrestore(&card->mask_lock, flags);
375         wake_up(&card->wait_q);
376 }
377
378 static inline int
379 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
380 {
381         unsigned long flags;
382         int rc = 0;
383
384         spin_lock_irqsave(&card->mask_lock, flags);
385         if (card->thread_start_mask & thread){
386                 if ((card->thread_allowed_mask & thread) &&
387                     !(card->thread_running_mask & thread)){
388                         rc = 1;
389                         card->thread_start_mask &= ~thread;
390                         card->thread_running_mask |= thread;
391                 } else
392                         rc = -EPERM;
393         }
394         spin_unlock_irqrestore(&card->mask_lock, flags);
395         return rc;
396 }
397
398 static int
399 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
400 {
401         int rc = 0;
402         wait_event(card->wait_q,
403                    (rc = __lcs_do_run_thread(card, thread)) >= 0);
404         return rc;
405 }
406
407 static int
408 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
409 {
410         unsigned long flags;
411         int rc = 0;
412
413         spin_lock_irqsave(&card->mask_lock, flags);
414         LCS_DBF_TEXT_(4, trace, "  %02x%02x%02x",
415                         (u8) card->thread_start_mask,
416                         (u8) card->thread_allowed_mask,
417                         (u8) card->thread_running_mask);
418         rc = (card->thread_start_mask & thread);
419         spin_unlock_irqrestore(&card->mask_lock, flags);
420         return rc;
421 }
422
423 /**
424  * Initialize channels,card and state machines.
425  */
426 static void
427 lcs_setup_card(struct lcs_card *card)
428 {
429         LCS_DBF_TEXT(2, setup, "initcard");
430         LCS_DBF_HEX(2, setup, &card, sizeof(void*));
431
432         lcs_setup_read(card);
433         lcs_setup_write(card);
434         /* Set cards initial state. */
435         card->state = DEV_STATE_DOWN;
436         card->tx_buffer = NULL;
437         card->tx_emitted = 0;
438
439         init_waitqueue_head(&card->wait_q);
440         spin_lock_init(&card->lock);
441         spin_lock_init(&card->ipm_lock);
442         spin_lock_init(&card->mask_lock);
443 #ifdef CONFIG_IP_MULTICAST
444         INIT_LIST_HEAD(&card->ipm_list);
445 #endif
446         INIT_LIST_HEAD(&card->lancmd_waiters);
447 }
448
449 static inline void
450 lcs_clear_multicast_list(struct lcs_card *card)
451 {
452 #ifdef  CONFIG_IP_MULTICAST
453         struct lcs_ipm_list *ipm;
454         unsigned long flags;
455
456         /* Free multicast list. */
457         LCS_DBF_TEXT(3, setup, "clmclist");
458         spin_lock_irqsave(&card->ipm_lock, flags);
459         while (!list_empty(&card->ipm_list)){
460                 ipm = list_entry(card->ipm_list.next,
461                                  struct lcs_ipm_list, list);
462                 list_del(&ipm->list);
463                 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
464                         spin_unlock_irqrestore(&card->ipm_lock, flags);
465                         lcs_send_delipm(card, ipm);
466                         spin_lock_irqsave(&card->ipm_lock, flags);
467                 }
468                 kfree(ipm);
469         }
470         spin_unlock_irqrestore(&card->ipm_lock, flags);
471 #endif
472 }
473 /**
474  * Cleanup channels,card and state machines.
475  */
476 static void
477 lcs_cleanup_card(struct lcs_card *card)
478 {
479
480         LCS_DBF_TEXT(3, setup, "cleancrd");
481         LCS_DBF_HEX(2,setup,&card,sizeof(void*));
482
483         if (card->dev != NULL)
484                 free_netdev(card->dev);
485         /* Cleanup channels. */
486         lcs_cleanup_channel(&card->write);
487         lcs_cleanup_channel(&card->read);
488 }
489
490 /**
491  * Start channel.
492  */
493 static int
494 lcs_start_channel(struct lcs_channel *channel)
495 {
496         unsigned long flags;
497         int rc;
498
499         LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
500         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
501         rc = ccw_device_start(channel->ccwdev,
502                               channel->ccws + channel->io_idx, 0, 0,
503                               DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
504         if (rc == 0)
505                 channel->state = LCS_CH_STATE_RUNNING;
506         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
507         if (rc) {
508                 LCS_DBF_TEXT_(4,trace,"essh%s",
509                               dev_name(&channel->ccwdev->dev));
510                 dev_err(&channel->ccwdev->dev,
511                         "Starting an LCS device resulted in an error,"
512                         " rc=%d!\n", rc);
513         }
514         return rc;
515 }
516
517 static int
518 lcs_clear_channel(struct lcs_channel *channel)
519 {
520         unsigned long flags;
521         int rc;
522
523         LCS_DBF_TEXT(4,trace,"clearch");
524         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
525         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
526         rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
527         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
528         if (rc) {
529                 LCS_DBF_TEXT_(4, trace, "ecsc%s",
530                               dev_name(&channel->ccwdev->dev));
531                 return rc;
532         }
533         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
534         channel->state = LCS_CH_STATE_STOPPED;
535         return rc;
536 }
537
538
539 /**
540  * Stop channel.
541  */
542 static int
543 lcs_stop_channel(struct lcs_channel *channel)
544 {
545         unsigned long flags;
546         int rc;
547
548         if (channel->state == LCS_CH_STATE_STOPPED)
549                 return 0;
550         LCS_DBF_TEXT(4,trace,"haltsch");
551         LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
552         channel->state = LCS_CH_STATE_INIT;
553         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
554         rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
555         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
556         if (rc) {
557                 LCS_DBF_TEXT_(4, trace, "ehsc%s",
558                               dev_name(&channel->ccwdev->dev));
559                 return rc;
560         }
561         /* Asynchronous halt initialted. Wait for its completion. */
562         wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
563         lcs_clear_channel(channel);
564         return 0;
565 }
566
567 /**
568  * start read and write channel
569  */
570 static int
571 lcs_start_channels(struct lcs_card *card)
572 {
573         int rc;
574
575         LCS_DBF_TEXT(2, trace, "chstart");
576         /* start read channel */
577         rc = lcs_start_channel(&card->read);
578         if (rc)
579                 return rc;
580         /* start write channel */
581         rc = lcs_start_channel(&card->write);
582         if (rc)
583                 lcs_stop_channel(&card->read);
584         return rc;
585 }
586
587 /**
588  * stop read and write channel
589  */
590 static int
591 lcs_stop_channels(struct lcs_card *card)
592 {
593         LCS_DBF_TEXT(2, trace, "chhalt");
594         lcs_stop_channel(&card->read);
595         lcs_stop_channel(&card->write);
596         return 0;
597 }
598
599 /**
600  * Get empty buffer.
601  */
602 static struct lcs_buffer *
603 __lcs_get_buffer(struct lcs_channel *channel)
604 {
605         int index;
606
607         LCS_DBF_TEXT(5, trace, "_getbuff");
608         index = channel->io_idx;
609         do {
610                 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
611                         channel->iob[index].state = LCS_BUF_STATE_LOCKED;
612                         return channel->iob + index;
613                 }
614                 index = (index + 1) & (LCS_NUM_BUFFS - 1);
615         } while (index != channel->io_idx);
616         return NULL;
617 }
618
619 static struct lcs_buffer *
620 lcs_get_buffer(struct lcs_channel *channel)
621 {
622         struct lcs_buffer *buffer;
623         unsigned long flags;
624
625         LCS_DBF_TEXT(5, trace, "getbuff");
626         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
627         buffer = __lcs_get_buffer(channel);
628         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
629         return buffer;
630 }
631
632 /**
633  * Resume channel program if the channel is suspended.
634  */
635 static int
636 __lcs_resume_channel(struct lcs_channel *channel)
637 {
638         int rc;
639
640         if (channel->state != LCS_CH_STATE_SUSPENDED)
641                 return 0;
642         if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
643                 return 0;
644         LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
645         rc = ccw_device_resume(channel->ccwdev);
646         if (rc) {
647                 LCS_DBF_TEXT_(4, trace, "ersc%s",
648                               dev_name(&channel->ccwdev->dev));
649                 dev_err(&channel->ccwdev->dev,
650                         "Sending data from the LCS device to the LAN failed"
651                         " with rc=%d\n",rc);
652         } else
653                 channel->state = LCS_CH_STATE_RUNNING;
654         return rc;
655
656 }
657
658 /**
659  * Make a buffer ready for processing.
660  */
661 static inline void
662 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
663 {
664         int prev, next;
665
666         LCS_DBF_TEXT(5, trace, "rdybits");
667         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
668         next = (index + 1) & (LCS_NUM_BUFFS - 1);
669         /* Check if we may clear the suspend bit of this buffer. */
670         if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
671                 /* Check if we have to set the PCI bit. */
672                 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
673                         /* Suspend bit of the previous buffer is not set. */
674                         channel->ccws[index].flags |= CCW_FLAG_PCI;
675                 /* Suspend bit of the next buffer is set. */
676                 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
677         }
678 }
679
680 static int
681 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
682 {
683         unsigned long flags;
684         int index, rc;
685
686         LCS_DBF_TEXT(5, trace, "rdybuff");
687         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
688                buffer->state != LCS_BUF_STATE_PROCESSED);
689         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
690         buffer->state = LCS_BUF_STATE_READY;
691         index = buffer - channel->iob;
692         /* Set length. */
693         channel->ccws[index].count = buffer->count;
694         /* Check relevant PCI/suspend bits. */
695         __lcs_ready_buffer_bits(channel, index);
696         rc = __lcs_resume_channel(channel);
697         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
698         return rc;
699 }
700
701 /**
702  * Mark the buffer as processed. Take care of the suspend bit
703  * of the previous buffer. This function is called from
704  * interrupt context, so the lock must not be taken.
705  */
706 static int
707 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
708 {
709         int index, prev, next;
710
711         LCS_DBF_TEXT(5, trace, "prcsbuff");
712         BUG_ON(buffer->state != LCS_BUF_STATE_READY);
713         buffer->state = LCS_BUF_STATE_PROCESSED;
714         index = buffer - channel->iob;
715         prev = (index - 1) & (LCS_NUM_BUFFS - 1);
716         next = (index + 1) & (LCS_NUM_BUFFS - 1);
717         /* Set the suspend bit and clear the PCI bit of this buffer. */
718         channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
719         channel->ccws[index].flags &= ~CCW_FLAG_PCI;
720         /* Check the suspend bit of the previous buffer. */
721         if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
722                 /*
723                  * Previous buffer is in state ready. It might have
724                  * happened in lcs_ready_buffer that the suspend bit
725                  * has not been cleared to avoid an endless loop.
726                  * Do it now.
727                  */
728                 __lcs_ready_buffer_bits(channel, prev);
729         }
730         /* Clear PCI bit of next buffer. */
731         channel->ccws[next].flags &= ~CCW_FLAG_PCI;
732         return __lcs_resume_channel(channel);
733 }
734
735 /**
736  * Put a processed buffer back to state empty.
737  */
738 static void
739 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
740 {
741         unsigned long flags;
742
743         LCS_DBF_TEXT(5, trace, "relbuff");
744         BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
745                buffer->state != LCS_BUF_STATE_PROCESSED);
746         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
747         buffer->state = LCS_BUF_STATE_EMPTY;
748         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
749 }
750
751 /**
752  * Get buffer for a lan command.
753  */
754 static struct lcs_buffer *
755 lcs_get_lancmd(struct lcs_card *card, int count)
756 {
757         struct lcs_buffer *buffer;
758         struct lcs_cmd *cmd;
759
760         LCS_DBF_TEXT(4, trace, "getlncmd");
761         /* Get buffer and wait if none is available. */
762         wait_event(card->write.wait_q,
763                    ((buffer = lcs_get_buffer(&card->write)) != NULL));
764         count += sizeof(struct lcs_header);
765         *(__u16 *)(buffer->data + count) = 0;
766         buffer->count = count + sizeof(__u16);
767         buffer->callback = lcs_release_buffer;
768         cmd = (struct lcs_cmd *) buffer->data;
769         cmd->offset = count;
770         cmd->type = LCS_FRAME_TYPE_CONTROL;
771         cmd->slot = 0;
772         return buffer;
773 }
774
775
776 static void
777 lcs_get_reply(struct lcs_reply *reply)
778 {
779         WARN_ON(atomic_read(&reply->refcnt) <= 0);
780         atomic_inc(&reply->refcnt);
781 }
782
783 static void
784 lcs_put_reply(struct lcs_reply *reply)
785 {
786         WARN_ON(atomic_read(&reply->refcnt) <= 0);
787         if (atomic_dec_and_test(&reply->refcnt)) {
788                 kfree(reply);
789         }
790
791 }
792
793 static struct lcs_reply *
794 lcs_alloc_reply(struct lcs_cmd *cmd)
795 {
796         struct lcs_reply *reply;
797
798         LCS_DBF_TEXT(4, trace, "getreply");
799
800         reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
801         if (!reply)
802                 return NULL;
803         atomic_set(&reply->refcnt,1);
804         reply->sequence_no = cmd->sequence_no;
805         reply->received = 0;
806         reply->rc = 0;
807         init_waitqueue_head(&reply->wait_q);
808
809         return reply;
810 }
811
812 /**
813  * Notifier function for lancmd replies. Called from read irq.
814  */
815 static void
816 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
817 {
818         struct list_head *l, *n;
819         struct lcs_reply *reply;
820
821         LCS_DBF_TEXT(4, trace, "notiwait");
822         spin_lock(&card->lock);
823         list_for_each_safe(l, n, &card->lancmd_waiters) {
824                 reply = list_entry(l, struct lcs_reply, list);
825                 if (reply->sequence_no == cmd->sequence_no) {
826                         lcs_get_reply(reply);
827                         list_del_init(&reply->list);
828                         if (reply->callback != NULL)
829                                 reply->callback(card, cmd);
830                         reply->received = 1;
831                         reply->rc = cmd->return_code;
832                         wake_up(&reply->wait_q);
833                         lcs_put_reply(reply);
834                         break;
835                 }
836         }
837         spin_unlock(&card->lock);
838 }
839
840 /**
841  * Emit buffer of a lan command.
842  */
843 static void
844 lcs_lancmd_timeout(unsigned long data)
845 {
846         struct lcs_reply *reply, *list_reply, *r;
847         unsigned long flags;
848
849         LCS_DBF_TEXT(4, trace, "timeout");
850         reply = (struct lcs_reply *) data;
851         spin_lock_irqsave(&reply->card->lock, flags);
852         list_for_each_entry_safe(list_reply, r,
853                                  &reply->card->lancmd_waiters,list) {
854                 if (reply == list_reply) {
855                         lcs_get_reply(reply);
856                         list_del_init(&reply->list);
857                         spin_unlock_irqrestore(&reply->card->lock, flags);
858                         reply->received = 1;
859                         reply->rc = -ETIME;
860                         wake_up(&reply->wait_q);
861                         lcs_put_reply(reply);
862                         return;
863                 }
864         }
865         spin_unlock_irqrestore(&reply->card->lock, flags);
866 }
867
868 static int
869 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
870                 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
871 {
872         struct lcs_reply *reply;
873         struct lcs_cmd *cmd;
874         struct timer_list timer;
875         unsigned long flags;
876         int rc;
877
878         LCS_DBF_TEXT(4, trace, "sendcmd");
879         cmd = (struct lcs_cmd *) buffer->data;
880         cmd->return_code = 0;
881         cmd->sequence_no = card->sequence_no++;
882         reply = lcs_alloc_reply(cmd);
883         if (!reply)
884                 return -ENOMEM;
885         reply->callback = reply_callback;
886         reply->card = card;
887         spin_lock_irqsave(&card->lock, flags);
888         list_add_tail(&reply->list, &card->lancmd_waiters);
889         spin_unlock_irqrestore(&card->lock, flags);
890
891         buffer->callback = lcs_release_buffer;
892         rc = lcs_ready_buffer(&card->write, buffer);
893         if (rc)
894                 return rc;
895         init_timer_on_stack(&timer);
896         timer.function = lcs_lancmd_timeout;
897         timer.data = (unsigned long) reply;
898         timer.expires = jiffies + HZ*card->lancmd_timeout;
899         add_timer(&timer);
900         wait_event(reply->wait_q, reply->received);
901         del_timer_sync(&timer);
902         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
903         rc = reply->rc;
904         lcs_put_reply(reply);
905         return rc ? -EIO : 0;
906 }
907
908 /**
909  * LCS startup command
910  */
911 static int
912 lcs_send_startup(struct lcs_card *card, __u8 initiator)
913 {
914         struct lcs_buffer *buffer;
915         struct lcs_cmd *cmd;
916
917         LCS_DBF_TEXT(2, trace, "startup");
918         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
919         cmd = (struct lcs_cmd *) buffer->data;
920         cmd->cmd_code = LCS_CMD_STARTUP;
921         cmd->initiator = initiator;
922         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
923         return lcs_send_lancmd(card, buffer, NULL);
924 }
925
926 /**
927  * LCS shutdown command
928  */
929 static int
930 lcs_send_shutdown(struct lcs_card *card)
931 {
932         struct lcs_buffer *buffer;
933         struct lcs_cmd *cmd;
934
935         LCS_DBF_TEXT(2, trace, "shutdown");
936         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
937         cmd = (struct lcs_cmd *) buffer->data;
938         cmd->cmd_code = LCS_CMD_SHUTDOWN;
939         cmd->initiator = LCS_INITIATOR_TCPIP;
940         return lcs_send_lancmd(card, buffer, NULL);
941 }
942
943 /**
944  * LCS lanstat command
945  */
946 static void
947 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
948 {
949         LCS_DBF_TEXT(2, trace, "statcb");
950         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
951 }
952
953 static int
954 lcs_send_lanstat(struct lcs_card *card)
955 {
956         struct lcs_buffer *buffer;
957         struct lcs_cmd *cmd;
958
959         LCS_DBF_TEXT(2,trace, "cmdstat");
960         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
961         cmd = (struct lcs_cmd *) buffer->data;
962         /* Setup lanstat command. */
963         cmd->cmd_code = LCS_CMD_LANSTAT;
964         cmd->initiator = LCS_INITIATOR_TCPIP;
965         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
966         cmd->cmd.lcs_std_cmd.portno = card->portno;
967         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
968 }
969
970 /**
971  * send stoplan command
972  */
973 static int
974 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
975 {
976         struct lcs_buffer *buffer;
977         struct lcs_cmd *cmd;
978
979         LCS_DBF_TEXT(2, trace, "cmdstpln");
980         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
981         cmd = (struct lcs_cmd *) buffer->data;
982         cmd->cmd_code = LCS_CMD_STOPLAN;
983         cmd->initiator = initiator;
984         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
985         cmd->cmd.lcs_std_cmd.portno = card->portno;
986         return lcs_send_lancmd(card, buffer, NULL);
987 }
988
989 /**
990  * send startlan command
991  */
992 static void
993 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
994 {
995         LCS_DBF_TEXT(2, trace, "srtlancb");
996         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
997         card->portno = cmd->cmd.lcs_std_cmd.portno;
998 }
999
1000 static int
1001 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1002 {
1003         struct lcs_buffer *buffer;
1004         struct lcs_cmd *cmd;
1005
1006         LCS_DBF_TEXT(2, trace, "cmdstaln");
1007         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1008         cmd = (struct lcs_cmd *) buffer->data;
1009         cmd->cmd_code = LCS_CMD_STARTLAN;
1010         cmd->initiator = initiator;
1011         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1012         cmd->cmd.lcs_std_cmd.portno = card->portno;
1013         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /**
1018  * send setipm command (Multicast)
1019  */
1020 static int
1021 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1022 {
1023         struct lcs_buffer *buffer;
1024         struct lcs_cmd *cmd;
1025
1026         LCS_DBF_TEXT(2, trace, "cmdsetim");
1027         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1028         cmd = (struct lcs_cmd *) buffer->data;
1029         cmd->cmd_code = LCS_CMD_SETIPM;
1030         cmd->initiator = LCS_INITIATOR_TCPIP;
1031         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1032         cmd->cmd.lcs_qipassist.portno = card->portno;
1033         cmd->cmd.lcs_qipassist.version = 4;
1034         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1035         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1036                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1037         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1038         return lcs_send_lancmd(card, buffer, NULL);
1039 }
1040
1041 /**
1042  * send delipm command (Multicast)
1043  */
1044 static int
1045 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1046 {
1047         struct lcs_buffer *buffer;
1048         struct lcs_cmd *cmd;
1049
1050         LCS_DBF_TEXT(2, trace, "cmddelim");
1051         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1052         cmd = (struct lcs_cmd *) buffer->data;
1053         cmd->cmd_code = LCS_CMD_DELIPM;
1054         cmd->initiator = LCS_INITIATOR_TCPIP;
1055         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1056         cmd->cmd.lcs_qipassist.portno = card->portno;
1057         cmd->cmd.lcs_qipassist.version = 4;
1058         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1059         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1060                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1061         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1062         return lcs_send_lancmd(card, buffer, NULL);
1063 }
1064
1065 /**
1066  * check if multicast is supported by LCS
1067  */
1068 static void
1069 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1070 {
1071         LCS_DBF_TEXT(2, trace, "chkmccb");
1072         card->ip_assists_supported =
1073                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1074         card->ip_assists_enabled =
1075                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1076 }
1077
1078 static int
1079 lcs_check_multicast_support(struct lcs_card *card)
1080 {
1081         struct lcs_buffer *buffer;
1082         struct lcs_cmd *cmd;
1083         int rc;
1084
1085         LCS_DBF_TEXT(2, trace, "cmdqipa");
1086         /* Send query ipassist. */
1087         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1088         cmd = (struct lcs_cmd *) buffer->data;
1089         cmd->cmd_code = LCS_CMD_QIPASSIST;
1090         cmd->initiator = LCS_INITIATOR_TCPIP;
1091         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1092         cmd->cmd.lcs_qipassist.portno = card->portno;
1093         cmd->cmd.lcs_qipassist.version = 4;
1094         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1095         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1096         if (rc != 0) {
1097                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1098                 return -EOPNOTSUPP;
1099         }
1100         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1101                 return 0;
1102         return -EOPNOTSUPP;
1103 }
1104
1105 /**
1106  * set or del multicast address on LCS card
1107  */
1108 static void
1109 lcs_fix_multicast_list(struct lcs_card *card)
1110 {
1111         struct list_head failed_list;
1112         struct lcs_ipm_list *ipm, *tmp;
1113         unsigned long flags;
1114         int rc;
1115
1116         LCS_DBF_TEXT(4,trace, "fixipm");
1117         INIT_LIST_HEAD(&failed_list);
1118         spin_lock_irqsave(&card->ipm_lock, flags);
1119 list_modified:
1120         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1121                 switch (ipm->ipm_state) {
1122                 case LCS_IPM_STATE_SET_REQUIRED:
1123                         /* del from ipm_list so no one else can tamper with
1124                          * this entry */
1125                         list_del_init(&ipm->list);
1126                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1127                         rc = lcs_send_setipm(card, ipm);
1128                         spin_lock_irqsave(&card->ipm_lock, flags);
1129                         if (rc) {
1130                                 pr_info("Adding multicast address failed."
1131                                         " Table possibly full!\n");
1132                                 /* store ipm in failed list -> will be added
1133                                  * to ipm_list again, so a retry will be done
1134                                  * during the next call of this function */
1135                                 list_add_tail(&ipm->list, &failed_list);
1136                         } else {
1137                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1138                                 /* re-insert into ipm_list */
1139                                 list_add_tail(&ipm->list, &card->ipm_list);
1140                         }
1141                         goto list_modified;
1142                 case LCS_IPM_STATE_DEL_REQUIRED:
1143                         list_del(&ipm->list);
1144                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1145                         lcs_send_delipm(card, ipm);
1146                         spin_lock_irqsave(&card->ipm_lock, flags);
1147                         kfree(ipm);
1148                         goto list_modified;
1149                 case LCS_IPM_STATE_ON_CARD:
1150                         break;
1151                 }
1152         }
1153         /* re-insert all entries from the failed_list into ipm_list */
1154         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1155                 list_move_tail(&ipm->list, &card->ipm_list);
1156
1157         spin_unlock_irqrestore(&card->ipm_lock, flags);
1158 }
1159
1160 /**
1161  * get mac address for the relevant Multicast address
1162  */
1163 static void
1164 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1165 {
1166         LCS_DBF_TEXT(4,trace, "getmac");
1167         ip_eth_mc_map(ipm, mac);
1168 }
1169
1170 /**
1171  * function called by net device to handle multicast address relevant things
1172  */
1173 static inline void
1174 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1175 {
1176         struct ip_mc_list *im4;
1177         struct list_head *l;
1178         struct lcs_ipm_list *ipm;
1179         unsigned long flags;
1180         char buf[MAX_ADDR_LEN];
1181
1182         LCS_DBF_TEXT(4, trace, "remmclst");
1183         spin_lock_irqsave(&card->ipm_lock, flags);
1184         list_for_each(l, &card->ipm_list) {
1185                 ipm = list_entry(l, struct lcs_ipm_list, list);
1186                 for (im4 = rcu_dereference(in4_dev->mc_list);
1187                      im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1188                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1189                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1190                              (memcmp(buf, &ipm->ipm.mac_addr,
1191                                      LCS_MAC_LENGTH) == 0) )
1192                                 break;
1193                 }
1194                 if (im4 == NULL)
1195                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1196         }
1197         spin_unlock_irqrestore(&card->ipm_lock, flags);
1198 }
1199
1200 static inline struct lcs_ipm_list *
1201 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1202 {
1203         struct lcs_ipm_list *tmp, *ipm = NULL;
1204         struct list_head *l;
1205         unsigned long flags;
1206
1207         LCS_DBF_TEXT(4, trace, "chkmcent");
1208         spin_lock_irqsave(&card->ipm_lock, flags);
1209         list_for_each(l, &card->ipm_list) {
1210                 tmp = list_entry(l, struct lcs_ipm_list, list);
1211                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1212                      (memcmp(buf, &tmp->ipm.mac_addr,
1213                              LCS_MAC_LENGTH) == 0) ) {
1214                         ipm = tmp;
1215                         break;
1216                 }
1217         }
1218         spin_unlock_irqrestore(&card->ipm_lock, flags);
1219         return ipm;
1220 }
1221
1222 static inline void
1223 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1224 {
1225
1226         struct ip_mc_list *im4;
1227         struct lcs_ipm_list *ipm;
1228         char buf[MAX_ADDR_LEN];
1229         unsigned long flags;
1230
1231         LCS_DBF_TEXT(4, trace, "setmclst");
1232         for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1233              im4 = rcu_dereference(im4->next_rcu)) {
1234                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1235                 ipm = lcs_check_addr_entry(card, im4, buf);
1236                 if (ipm != NULL)
1237                         continue;       /* Address already in list. */
1238                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1239                 if (ipm == NULL) {
1240                         pr_info("Not enough memory to add"
1241                                 " new multicast entry!\n");
1242                         break;
1243                 }
1244                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1245                 ipm->ipm.ip_addr = im4->multiaddr;
1246                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1247                 spin_lock_irqsave(&card->ipm_lock, flags);
1248                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1249                 list_add(&ipm->list, &card->ipm_list);
1250                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1251         }
1252 }
1253
1254 static int
1255 lcs_register_mc_addresses(void *data)
1256 {
1257         struct lcs_card *card;
1258         struct in_device *in4_dev;
1259
1260         card = (struct lcs_card *) data;
1261
1262         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1263                 return 0;
1264         LCS_DBF_TEXT(4, trace, "regmulti");
1265
1266         in4_dev = in_dev_get(card->dev);
1267         if (in4_dev == NULL)
1268                 goto out;
1269         rcu_read_lock();
1270         lcs_remove_mc_addresses(card,in4_dev);
1271         lcs_set_mc_addresses(card, in4_dev);
1272         rcu_read_unlock();
1273         in_dev_put(in4_dev);
1274
1275         netif_carrier_off(card->dev);
1276         netif_tx_disable(card->dev);
1277         wait_event(card->write.wait_q,
1278                         (card->write.state != LCS_CH_STATE_RUNNING));
1279         lcs_fix_multicast_list(card);
1280         if (card->state == DEV_STATE_UP) {
1281                 netif_carrier_on(card->dev);
1282                 netif_wake_queue(card->dev);
1283         }
1284 out:
1285         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1286         return 0;
1287 }
1288 #endif /* CONFIG_IP_MULTICAST */
1289
1290 /**
1291  * function called by net device to
1292  * handle multicast address relevant things
1293  */
1294 static void
1295 lcs_set_multicast_list(struct net_device *dev)
1296 {
1297 #ifdef CONFIG_IP_MULTICAST
1298         struct lcs_card *card;
1299
1300         LCS_DBF_TEXT(4, trace, "setmulti");
1301         card = (struct lcs_card *) dev->ml_priv;
1302
1303         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1304                 schedule_work(&card->kernel_thread_starter);
1305 #endif /* CONFIG_IP_MULTICAST */
1306 }
1307
1308 static long
1309 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1310 {
1311         if (!IS_ERR(irb))
1312                 return 0;
1313
1314         switch (PTR_ERR(irb)) {
1315         case -EIO:
1316                 dev_warn(&cdev->dev,
1317                         "An I/O-error occurred on the LCS device\n");
1318                 LCS_DBF_TEXT(2, trace, "ckirberr");
1319                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1320                 break;
1321         case -ETIMEDOUT:
1322                 dev_warn(&cdev->dev,
1323                         "A command timed out on the LCS device\n");
1324                 LCS_DBF_TEXT(2, trace, "ckirberr");
1325                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1326                 break;
1327         default:
1328                 dev_warn(&cdev->dev,
1329                         "An error occurred on the LCS device, rc=%ld\n",
1330                         PTR_ERR(irb));
1331                 LCS_DBF_TEXT(2, trace, "ckirberr");
1332                 LCS_DBF_TEXT(2, trace, "  rc???");
1333         }
1334         return PTR_ERR(irb);
1335 }
1336
1337 static int
1338 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1339 {
1340         int dstat, cstat;
1341         char *sense;
1342
1343         sense = (char *) irb->ecw;
1344         cstat = irb->scsw.cmd.cstat;
1345         dstat = irb->scsw.cmd.dstat;
1346
1347         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1348                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1349                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1350                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1351                 return 1;
1352         }
1353         if (dstat & DEV_STAT_UNIT_CHECK) {
1354                 if (sense[LCS_SENSE_BYTE_1] &
1355                     LCS_SENSE_RESETTING_EVENT) {
1356                         LCS_DBF_TEXT(2, trace, "REVIND");
1357                         return 1;
1358                 }
1359                 if (sense[LCS_SENSE_BYTE_0] &
1360                     LCS_SENSE_CMD_REJECT) {
1361                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1362                         return 0;
1363                 }
1364                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1365                     (!sense[LCS_SENSE_BYTE_1]) &&
1366                     (!sense[LCS_SENSE_BYTE_2]) &&
1367                     (!sense[LCS_SENSE_BYTE_3])) {
1368                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1369                         return 0;
1370                 }
1371                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1372                 return 1;
1373         }
1374         return 0;
1375 }
1376
1377 static void
1378 lcs_schedule_recovery(struct lcs_card *card)
1379 {
1380         LCS_DBF_TEXT(2, trace, "startrec");
1381         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1382                 schedule_work(&card->kernel_thread_starter);
1383 }
1384
1385 /**
1386  * IRQ Handler for LCS channels
1387  */
1388 static void
1389 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1390 {
1391         struct lcs_card *card;
1392         struct lcs_channel *channel;
1393         int rc, index;
1394         int cstat, dstat;
1395
1396         if (lcs_check_irb_error(cdev, irb))
1397                 return;
1398
1399         card = CARD_FROM_DEV(cdev);
1400         if (card->read.ccwdev == cdev)
1401                 channel = &card->read;
1402         else
1403                 channel = &card->write;
1404
1405         cstat = irb->scsw.cmd.cstat;
1406         dstat = irb->scsw.cmd.dstat;
1407         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1408         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1409                       irb->scsw.cmd.dstat);
1410         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1411                       irb->scsw.cmd.actl);
1412
1413         /* Check for channel and device errors presented */
1414         rc = lcs_get_problem(cdev, irb);
1415         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1416                 dev_warn(&cdev->dev,
1417                         "The LCS device stopped because of an error,"
1418                         " dstat=0x%X, cstat=0x%X \n",
1419                             dstat, cstat);
1420                 if (rc) {
1421                         channel->state = LCS_CH_STATE_ERROR;
1422                 }
1423         }
1424         if (channel->state == LCS_CH_STATE_ERROR) {
1425                 lcs_schedule_recovery(card);
1426                 wake_up(&card->wait_q);
1427                 return;
1428         }
1429         /* How far in the ccw chain have we processed? */
1430         if ((channel->state != LCS_CH_STATE_INIT) &&
1431             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1432             (irb->scsw.cmd.cpa != 0)) {
1433                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1434                         - channel->ccws;
1435                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1436                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1437                         /* Bloody io subsystem tells us lies about cpa... */
1438                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1439                 while (channel->io_idx != index) {
1440                         __lcs_processed_buffer(channel,
1441                                                channel->iob + channel->io_idx);
1442                         channel->io_idx =
1443                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1444                 }
1445         }
1446
1447         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1448             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1449             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1450                 /* Mark channel as stopped. */
1451                 channel->state = LCS_CH_STATE_STOPPED;
1452         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1453                 /* CCW execution stopped on a suspend bit. */
1454                 channel->state = LCS_CH_STATE_SUSPENDED;
1455         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1456                 if (irb->scsw.cmd.cc != 0) {
1457                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1458                         return;
1459                 }
1460                 /* The channel has been stopped by halt_IO. */
1461                 channel->state = LCS_CH_STATE_HALTED;
1462         }
1463         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1464                 channel->state = LCS_CH_STATE_CLEARED;
1465         /* Do the rest in the tasklet. */
1466         tasklet_schedule(&channel->irq_tasklet);
1467 }
1468
1469 /**
1470  * Tasklet for IRQ handler
1471  */
1472 static void
1473 lcs_tasklet(unsigned long data)
1474 {
1475         unsigned long flags;
1476         struct lcs_channel *channel;
1477         struct lcs_buffer *iob;
1478         int buf_idx;
1479
1480         channel = (struct lcs_channel *) data;
1481         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1482
1483         /* Check for processed buffers. */
1484         iob = channel->iob;
1485         buf_idx = channel->buf_idx;
1486         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1487                 /* Do the callback thing. */
1488                 if (iob[buf_idx].callback != NULL)
1489                         iob[buf_idx].callback(channel, iob + buf_idx);
1490                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1491         }
1492         channel->buf_idx = buf_idx;
1493
1494         if (channel->state == LCS_CH_STATE_STOPPED)
1495                 lcs_start_channel(channel);
1496         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1497         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1498             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1499                 __lcs_resume_channel(channel);
1500         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1501
1502         /* Something happened on the channel. Wake up waiters. */
1503         wake_up(&channel->wait_q);
1504 }
1505
1506 /**
1507  * Finish current tx buffer and make it ready for transmit.
1508  */
1509 static void
1510 __lcs_emit_txbuffer(struct lcs_card *card)
1511 {
1512         LCS_DBF_TEXT(5, trace, "emittx");
1513         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1514         card->tx_buffer->count += 2;
1515         lcs_ready_buffer(&card->write, card->tx_buffer);
1516         card->tx_buffer = NULL;
1517         card->tx_emitted++;
1518 }
1519
1520 /**
1521  * Callback for finished tx buffers.
1522  */
1523 static void
1524 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1525 {
1526         struct lcs_card *card;
1527
1528         LCS_DBF_TEXT(5, trace, "txbuffcb");
1529         /* Put buffer back to pool. */
1530         lcs_release_buffer(channel, buffer);
1531         card = container_of(channel, struct lcs_card, write);
1532         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1533                 netif_wake_queue(card->dev);
1534         spin_lock(&card->lock);
1535         card->tx_emitted--;
1536         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1537                 /*
1538                  * Last running tx buffer has finished. Submit partially
1539                  * filled current buffer.
1540                  */
1541                 __lcs_emit_txbuffer(card);
1542         spin_unlock(&card->lock);
1543 }
1544
1545 /**
1546  * Packet transmit function called by network stack
1547  */
1548 static int
1549 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1550                  struct net_device *dev)
1551 {
1552         struct lcs_header *header;
1553         int rc = NETDEV_TX_OK;
1554
1555         LCS_DBF_TEXT(5, trace, "hardxmit");
1556         if (skb == NULL) {
1557                 card->stats.tx_dropped++;
1558                 card->stats.tx_errors++;
1559                 return NETDEV_TX_OK;
1560         }
1561         if (card->state != DEV_STATE_UP) {
1562                 dev_kfree_skb(skb);
1563                 card->stats.tx_dropped++;
1564                 card->stats.tx_errors++;
1565                 card->stats.tx_carrier_errors++;
1566                 return NETDEV_TX_OK;
1567         }
1568         if (skb->protocol == htons(ETH_P_IPV6)) {
1569                 dev_kfree_skb(skb);
1570                 return NETDEV_TX_OK;
1571         }
1572         netif_stop_queue(card->dev);
1573         spin_lock(&card->lock);
1574         if (card->tx_buffer != NULL &&
1575             card->tx_buffer->count + sizeof(struct lcs_header) +
1576             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1577                 /* skb too big for current tx buffer. */
1578                 __lcs_emit_txbuffer(card);
1579         if (card->tx_buffer == NULL) {
1580                 /* Get new tx buffer */
1581                 card->tx_buffer = lcs_get_buffer(&card->write);
1582                 if (card->tx_buffer == NULL) {
1583                         card->stats.tx_dropped++;
1584                         rc = NETDEV_TX_BUSY;
1585                         goto out;
1586                 }
1587                 card->tx_buffer->callback = lcs_txbuffer_cb;
1588                 card->tx_buffer->count = 0;
1589         }
1590         header = (struct lcs_header *)
1591                 (card->tx_buffer->data + card->tx_buffer->count);
1592         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1593         header->offset = card->tx_buffer->count;
1594         header->type = card->lan_type;
1595         header->slot = card->portno;
1596         skb_copy_from_linear_data(skb, header + 1, skb->len);
1597         spin_unlock(&card->lock);
1598         card->stats.tx_bytes += skb->len;
1599         card->stats.tx_packets++;
1600         dev_kfree_skb(skb);
1601         netif_wake_queue(card->dev);
1602         spin_lock(&card->lock);
1603         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1604                 /* If this is the first tx buffer emit it immediately. */
1605                 __lcs_emit_txbuffer(card);
1606 out:
1607         spin_unlock(&card->lock);
1608         return rc;
1609 }
1610
1611 static int
1612 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1613 {
1614         struct lcs_card *card;
1615         int rc;
1616
1617         LCS_DBF_TEXT(5, trace, "pktxmit");
1618         card = (struct lcs_card *) dev->ml_priv;
1619         rc = __lcs_start_xmit(card, skb, dev);
1620         return rc;
1621 }
1622
1623 /**
1624  * send startlan and lanstat command to make LCS device ready
1625  */
1626 static int
1627 lcs_startlan_auto(struct lcs_card *card)
1628 {
1629         int rc;
1630
1631         LCS_DBF_TEXT(2, trace, "strtauto");
1632 #ifdef CONFIG_ETHERNET
1633         card->lan_type = LCS_FRAME_TYPE_ENET;
1634         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1635         if (rc == 0)
1636                 return 0;
1637
1638 #endif
1639 #ifdef CONFIG_FDDI
1640         card->lan_type = LCS_FRAME_TYPE_FDDI;
1641         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642         if (rc == 0)
1643                 return 0;
1644 #endif
1645         return -EIO;
1646 }
1647
1648 static int
1649 lcs_startlan(struct lcs_card *card)
1650 {
1651         int rc, i;
1652
1653         LCS_DBF_TEXT(2, trace, "startlan");
1654         rc = 0;
1655         if (card->portno != LCS_INVALID_PORT_NO) {
1656                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1657                         rc = lcs_startlan_auto(card);
1658                 else
1659                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1660         } else {
1661                 for (i = 0; i <= 16; i++) {
1662                         card->portno = i;
1663                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1664                                 rc = lcs_send_startlan(card,
1665                                                        LCS_INITIATOR_TCPIP);
1666                         else
1667                                 /* autodetecting lan type */
1668                                 rc = lcs_startlan_auto(card);
1669                         if (rc == 0)
1670                                 break;
1671                 }
1672         }
1673         if (rc == 0)
1674                 return lcs_send_lanstat(card);
1675         return rc;
1676 }
1677
1678 /**
1679  * LCS detect function
1680  * setup channels and make them I/O ready
1681  */
1682 static int
1683 lcs_detect(struct lcs_card *card)
1684 {
1685         int rc = 0;
1686
1687         LCS_DBF_TEXT(2, setup, "lcsdetct");
1688         /* start/reset card */
1689         if (card->dev)
1690                 netif_stop_queue(card->dev);
1691         rc = lcs_stop_channels(card);
1692         if (rc == 0) {
1693                 rc = lcs_start_channels(card);
1694                 if (rc == 0) {
1695                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1696                         if (rc == 0)
1697                                 rc = lcs_startlan(card);
1698                 }
1699         }
1700         if (rc == 0) {
1701                 card->state = DEV_STATE_UP;
1702         } else {
1703                 card->state = DEV_STATE_DOWN;
1704                 card->write.state = LCS_CH_STATE_INIT;
1705                 card->read.state =  LCS_CH_STATE_INIT;
1706         }
1707         return rc;
1708 }
1709
1710 /**
1711  * LCS Stop card
1712  */
1713 static int
1714 lcs_stopcard(struct lcs_card *card)
1715 {
1716         int rc;
1717
1718         LCS_DBF_TEXT(3, setup, "stopcard");
1719
1720         if (card->read.state != LCS_CH_STATE_STOPPED &&
1721             card->write.state != LCS_CH_STATE_STOPPED &&
1722             card->read.state != LCS_CH_STATE_ERROR &&
1723             card->write.state != LCS_CH_STATE_ERROR &&
1724             card->state == DEV_STATE_UP) {
1725                 lcs_clear_multicast_list(card);
1726                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1727                 rc = lcs_send_shutdown(card);
1728         }
1729         rc = lcs_stop_channels(card);
1730         card->state = DEV_STATE_DOWN;
1731
1732         return rc;
1733 }
1734
1735 /**
1736  * Kernel Thread helper functions for LGW initiated commands
1737  */
1738 static void
1739 lcs_start_kernel_thread(struct work_struct *work)
1740 {
1741         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1742         LCS_DBF_TEXT(5, trace, "krnthrd");
1743         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1744                 kthread_run(lcs_recovery, card, "lcs_recover");
1745 #ifdef CONFIG_IP_MULTICAST
1746         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1747                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1748 #endif
1749 }
1750
1751 /**
1752  * Process control frames.
1753  */
1754 static void
1755 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1756 {
1757         LCS_DBF_TEXT(5, trace, "getctrl");
1758         if (cmd->initiator == LCS_INITIATOR_LGW) {
1759                 switch(cmd->cmd_code) {
1760                 case LCS_CMD_STARTUP:
1761                 case LCS_CMD_STARTLAN:
1762                         lcs_schedule_recovery(card);
1763                         break;
1764                 case LCS_CMD_STOPLAN:
1765                         pr_warning("Stoplan for %s initiated by LGW.\n",
1766                                    card->dev->name);
1767                         if (card->dev)
1768                                 netif_carrier_off(card->dev);
1769                         break;
1770                 default:
1771                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1772                         break;
1773                 }
1774         } else
1775                 lcs_notify_lancmd_waiters(card, cmd);
1776 }
1777
1778 /**
1779  * Unpack network packet.
1780  */
1781 static void
1782 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1783 {
1784         struct sk_buff *skb;
1785
1786         LCS_DBF_TEXT(5, trace, "getskb");
1787         if (card->dev == NULL ||
1788             card->state != DEV_STATE_UP)
1789                 /* The card isn't up. Ignore the packet. */
1790                 return;
1791
1792         skb = dev_alloc_skb(skb_len);
1793         if (skb == NULL) {
1794                 dev_err(&card->dev->dev,
1795                         " Allocating a socket buffer to interface %s failed\n",
1796                           card->dev->name);
1797                 card->stats.rx_dropped++;
1798                 return;
1799         }
1800         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1801         skb->protocol = card->lan_type_trans(skb, card->dev);
1802         card->stats.rx_bytes += skb_len;
1803         card->stats.rx_packets++;
1804         if (skb->protocol == htons(ETH_P_802_2))
1805                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1806         netif_rx(skb);
1807 }
1808
1809 /**
1810  * LCS main routine to get packets and lancmd replies from the buffers
1811  */
1812 static void
1813 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1814 {
1815         struct lcs_card *card;
1816         struct lcs_header *lcs_hdr;
1817         __u16 offset;
1818
1819         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1820         lcs_hdr = (struct lcs_header *) buffer->data;
1821         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1822                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1823                 return;
1824         }
1825         card = container_of(channel, struct lcs_card, read);
1826         offset = 0;
1827         while (lcs_hdr->offset != 0) {
1828                 if (lcs_hdr->offset <= 0 ||
1829                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1830                     lcs_hdr->offset < offset) {
1831                         /* Offset invalid. */
1832                         card->stats.rx_length_errors++;
1833                         card->stats.rx_errors++;
1834                         return;
1835                 }
1836                 /* What kind of frame is it? */
1837                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1838                         /* Control frame. */
1839                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1840                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1841                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1842                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1843                         /* Normal network packet. */
1844                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1845                                     lcs_hdr->offset - offset -
1846                                     sizeof(struct lcs_header));
1847                 else
1848                         /* Unknown frame type. */
1849                         ; // FIXME: error message ?
1850                 /* Proceed to next frame. */
1851                 offset = lcs_hdr->offset;
1852                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1853                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1854         }
1855         /* The buffer is now empty. Make it ready again. */
1856         lcs_ready_buffer(&card->read, buffer);
1857 }
1858
1859 /**
1860  * get network statistics for ifconfig and other user programs
1861  */
1862 static struct net_device_stats *
1863 lcs_getstats(struct net_device *dev)
1864 {
1865         struct lcs_card *card;
1866
1867         LCS_DBF_TEXT(4, trace, "netstats");
1868         card = (struct lcs_card *) dev->ml_priv;
1869         return &card->stats;
1870 }
1871
1872 /**
1873  * stop lcs device
1874  * This function will be called by user doing ifconfig xxx down
1875  */
1876 static int
1877 lcs_stop_device(struct net_device *dev)
1878 {
1879         struct lcs_card *card;
1880         int rc;
1881
1882         LCS_DBF_TEXT(2, trace, "stopdev");
1883         card   = (struct lcs_card *) dev->ml_priv;
1884         netif_carrier_off(dev);
1885         netif_tx_disable(dev);
1886         dev->flags &= ~IFF_UP;
1887         wait_event(card->write.wait_q,
1888                 (card->write.state != LCS_CH_STATE_RUNNING));
1889         rc = lcs_stopcard(card);
1890         if (rc)
1891                 dev_err(&card->dev->dev,
1892                         " Shutting down the LCS device failed\n ");
1893         return rc;
1894 }
1895
1896 /**
1897  * start lcs device and make it runnable
1898  * This function will be called by user doing ifconfig xxx up
1899  */
1900 static int
1901 lcs_open_device(struct net_device *dev)
1902 {
1903         struct lcs_card *card;
1904         int rc;
1905
1906         LCS_DBF_TEXT(2, trace, "opendev");
1907         card = (struct lcs_card *) dev->ml_priv;
1908         /* initialize statistics */
1909         rc = lcs_detect(card);
1910         if (rc) {
1911                 pr_err("Error in opening device!\n");
1912
1913         } else {
1914                 dev->flags |= IFF_UP;
1915                 netif_carrier_on(dev);
1916                 netif_wake_queue(dev);
1917                 card->state = DEV_STATE_UP;
1918         }
1919         return rc;
1920 }
1921
1922 /**
1923  * show function for portno called by cat or similar things
1924  */
1925 static ssize_t
1926 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1927 {
1928         struct lcs_card *card;
1929
1930         card = dev_get_drvdata(dev);
1931
1932         if (!card)
1933                 return 0;
1934
1935         return sprintf(buf, "%d\n", card->portno);
1936 }
1937
1938 /**
1939  * store the value which is piped to file portno
1940  */
1941 static ssize_t
1942 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1943 {
1944         struct lcs_card *card;
1945         int value;
1946
1947         card = dev_get_drvdata(dev);
1948
1949         if (!card)
1950                 return 0;
1951
1952         sscanf(buf, "%u", &value);
1953         /* TODO: sanity checks */
1954         card->portno = value;
1955
1956         return count;
1957
1958 }
1959
1960 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1961
1962 static const char *lcs_type[] = {
1963         "not a channel",
1964         "2216 parallel",
1965         "2216 channel",
1966         "OSA LCS card",
1967         "unknown channel type",
1968         "unsupported channel type",
1969 };
1970
1971 static ssize_t
1972 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1973 {
1974         struct ccwgroup_device *cgdev;
1975
1976         cgdev = to_ccwgroupdev(dev);
1977         if (!cgdev)
1978                 return -ENODEV;
1979
1980         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1981 }
1982
1983 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1984
1985 static ssize_t
1986 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1987 {
1988         struct lcs_card *card;
1989
1990         card = dev_get_drvdata(dev);
1991
1992         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1993 }
1994
1995 static ssize_t
1996 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1997 {
1998         struct lcs_card *card;
1999         int value;
2000
2001         card = dev_get_drvdata(dev);
2002
2003         if (!card)
2004                 return 0;
2005
2006         sscanf(buf, "%u", &value);
2007         /* TODO: sanity checks */
2008         card->lancmd_timeout = value;
2009
2010         return count;
2011
2012 }
2013
2014 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2015
2016 static ssize_t
2017 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2018                       const char *buf, size_t count)
2019 {
2020         struct lcs_card *card = dev_get_drvdata(dev);
2021         char *tmp;
2022         int i;
2023
2024         if (!card)
2025                 return -EINVAL;
2026         if (card->state != DEV_STATE_UP)
2027                 return -EPERM;
2028         i = simple_strtoul(buf, &tmp, 16);
2029         if (i == 1)
2030                 lcs_schedule_recovery(card);
2031         return count;
2032 }
2033
2034 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2035
2036 static struct attribute * lcs_attrs[] = {
2037         &dev_attr_portno.attr,
2038         &dev_attr_type.attr,
2039         &dev_attr_lancmd_timeout.attr,
2040         &dev_attr_recover.attr,
2041         NULL,
2042 };
2043 static struct attribute_group lcs_attr_group = {
2044         .attrs = lcs_attrs,
2045 };
2046 static const struct attribute_group *lcs_attr_groups[] = {
2047         &lcs_attr_group,
2048         NULL,
2049 };
2050 static const struct device_type lcs_devtype = {
2051         .name = "lcs",
2052         .groups = lcs_attr_groups,
2053 };
2054
2055 /**
2056  * lcs_probe_device is called on establishing a new ccwgroup_device.
2057  */
2058 static int
2059 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2060 {
2061         struct lcs_card *card;
2062
2063         if (!get_device(&ccwgdev->dev))
2064                 return -ENODEV;
2065
2066         LCS_DBF_TEXT(2, setup, "add_dev");
2067         card = lcs_alloc_card();
2068         if (!card) {
2069                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2070                 put_device(&ccwgdev->dev);
2071                 return -ENOMEM;
2072         }
2073         dev_set_drvdata(&ccwgdev->dev, card);
2074         ccwgdev->cdev[0]->handler = lcs_irq;
2075         ccwgdev->cdev[1]->handler = lcs_irq;
2076         card->gdev = ccwgdev;
2077         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2078         card->thread_start_mask = 0;
2079         card->thread_allowed_mask = 0;
2080         card->thread_running_mask = 0;
2081         ccwgdev->dev.type = &lcs_devtype;
2082
2083         return 0;
2084 }
2085
2086 static int
2087 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2088 {
2089         struct lcs_card *card;
2090
2091         LCS_DBF_TEXT(2, setup, "regnetdv");
2092         card = dev_get_drvdata(&ccwgdev->dev);
2093         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2094                 return 0;
2095         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2096         return register_netdev(card->dev);
2097 }
2098
2099 /**
2100  * lcs_new_device will be called by setting the group device online.
2101  */
2102 static const struct net_device_ops lcs_netdev_ops = {
2103         .ndo_open               = lcs_open_device,
2104         .ndo_stop               = lcs_stop_device,
2105         .ndo_get_stats          = lcs_getstats,
2106         .ndo_start_xmit         = lcs_start_xmit,
2107 };
2108
2109 static const struct net_device_ops lcs_mc_netdev_ops = {
2110         .ndo_open               = lcs_open_device,
2111         .ndo_stop               = lcs_stop_device,
2112         .ndo_get_stats          = lcs_getstats,
2113         .ndo_start_xmit         = lcs_start_xmit,
2114         .ndo_set_rx_mode        = lcs_set_multicast_list,
2115 };
2116
2117 static int
2118 lcs_new_device(struct ccwgroup_device *ccwgdev)
2119 {
2120         struct  lcs_card *card;
2121         struct net_device *dev=NULL;
2122         enum lcs_dev_states recover_state;
2123         int rc;
2124
2125         card = dev_get_drvdata(&ccwgdev->dev);
2126         if (!card)
2127                 return -ENODEV;
2128
2129         LCS_DBF_TEXT(2, setup, "newdev");
2130         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2131         card->read.ccwdev  = ccwgdev->cdev[0];
2132         card->write.ccwdev = ccwgdev->cdev[1];
2133
2134         recover_state = card->state;
2135         rc = ccw_device_set_online(card->read.ccwdev);
2136         if (rc)
2137                 goto out_err;
2138         rc = ccw_device_set_online(card->write.ccwdev);
2139         if (rc)
2140                 goto out_werr;
2141
2142         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2143
2144         lcs_setup_card(card);
2145         rc = lcs_detect(card);
2146         if (rc) {
2147                 LCS_DBF_TEXT(2, setup, "dtctfail");
2148                 dev_err(&card->dev->dev,
2149                         "Detecting a network adapter for LCS devices"
2150                         " failed with rc=%d (0x%x)\n", rc, rc);
2151                 lcs_stopcard(card);
2152                 goto out;
2153         }
2154         if (card->dev) {
2155                 LCS_DBF_TEXT(2, setup, "samedev");
2156                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2157                 goto netdev_out;
2158         }
2159         switch (card->lan_type) {
2160 #ifdef CONFIG_ETHERNET
2161         case LCS_FRAME_TYPE_ENET:
2162                 card->lan_type_trans = eth_type_trans;
2163                 dev = alloc_etherdev(0);
2164                 break;
2165 #endif
2166 #ifdef CONFIG_FDDI
2167         case LCS_FRAME_TYPE_FDDI:
2168                 card->lan_type_trans = fddi_type_trans;
2169                 dev = alloc_fddidev(0);
2170                 break;
2171 #endif
2172         default:
2173                 LCS_DBF_TEXT(3, setup, "errinit");
2174                 pr_err(" Initialization failed\n");
2175                 goto out;
2176         }
2177         if (!dev)
2178                 goto out;
2179         card->dev = dev;
2180         card->dev->ml_priv = card;
2181         card->dev->netdev_ops = &lcs_netdev_ops;
2182         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2183 #ifdef CONFIG_IP_MULTICAST
2184         if (!lcs_check_multicast_support(card))
2185                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2186 #endif
2187 netdev_out:
2188         lcs_set_allowed_threads(card,0xffffffff);
2189         if (recover_state == DEV_STATE_RECOVER) {
2190                 lcs_set_multicast_list(card->dev);
2191                 card->dev->flags |= IFF_UP;
2192                 netif_carrier_on(card->dev);
2193                 netif_wake_queue(card->dev);
2194                 card->state = DEV_STATE_UP;
2195         } else {
2196                 lcs_stopcard(card);
2197         }
2198
2199         if (lcs_register_netdev(ccwgdev) != 0)
2200                 goto out;
2201
2202         /* Print out supported assists: IPv6 */
2203         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2204                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2205                 "with" : "without");
2206         /* Print out supported assist: Multicast */
2207         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2208                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2209                 "with" : "without");
2210         return 0;
2211 out:
2212
2213         ccw_device_set_offline(card->write.ccwdev);
2214 out_werr:
2215         ccw_device_set_offline(card->read.ccwdev);
2216 out_err:
2217         return -ENODEV;
2218 }
2219
2220 /**
2221  * lcs_shutdown_device, called when setting the group device offline.
2222  */
2223 static int
2224 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2225 {
2226         struct lcs_card *card;
2227         enum lcs_dev_states recover_state;
2228         int ret = 0, ret2 = 0, ret3 = 0;
2229
2230         LCS_DBF_TEXT(3, setup, "shtdndev");
2231         card = dev_get_drvdata(&ccwgdev->dev);
2232         if (!card)
2233                 return -ENODEV;
2234         if (recovery_mode == 0) {
2235                 lcs_set_allowed_threads(card, 0);
2236                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2237                         return -ERESTARTSYS;
2238         }
2239         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2240         recover_state = card->state;
2241
2242         ret = lcs_stop_device(card->dev);
2243         ret2 = ccw_device_set_offline(card->read.ccwdev);
2244         ret3 = ccw_device_set_offline(card->write.ccwdev);
2245         if (!ret)
2246                 ret = (ret2) ? ret2 : ret3;
2247         if (ret)
2248                 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2249         if (recover_state == DEV_STATE_UP) {
2250                 card->state = DEV_STATE_RECOVER;
2251         }
2252         return 0;
2253 }
2254
2255 static int
2256 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2257 {
2258         return __lcs_shutdown_device(ccwgdev, 0);
2259 }
2260
2261 /**
2262  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2263  */
2264 static int
2265 lcs_recovery(void *ptr)
2266 {
2267         struct lcs_card *card;
2268         struct ccwgroup_device *gdev;
2269         int rc;
2270
2271         card = (struct lcs_card *) ptr;
2272
2273         LCS_DBF_TEXT(4, trace, "recover1");
2274         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2275                 return 0;
2276         LCS_DBF_TEXT(4, trace, "recover2");
2277         gdev = card->gdev;
2278         dev_warn(&gdev->dev,
2279                 "A recovery process has been started for the LCS device\n");
2280         rc = __lcs_shutdown_device(gdev, 1);
2281         rc = lcs_new_device(gdev);
2282         if (!rc)
2283                 pr_info("Device %s successfully recovered!\n",
2284                         card->dev->name);
2285         else
2286                 pr_info("Device %s could not be recovered!\n",
2287                         card->dev->name);
2288         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2289         return 0;
2290 }
2291
2292 /**
2293  * lcs_remove_device, free buffers and card
2294  */
2295 static void
2296 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2297 {
2298         struct lcs_card *card;
2299
2300         card = dev_get_drvdata(&ccwgdev->dev);
2301         if (!card)
2302                 return;
2303
2304         LCS_DBF_TEXT(3, setup, "remdev");
2305         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2306         if (ccwgdev->state == CCWGROUP_ONLINE) {
2307                 lcs_shutdown_device(ccwgdev);
2308         }
2309         if (card->dev)
2310                 unregister_netdev(card->dev);
2311         lcs_cleanup_card(card);
2312         lcs_free_card(card);
2313         dev_set_drvdata(&ccwgdev->dev, NULL);
2314         put_device(&ccwgdev->dev);
2315 }
2316
2317 static int lcs_pm_suspend(struct lcs_card *card)
2318 {
2319         if (card->dev)
2320                 netif_device_detach(card->dev);
2321         lcs_set_allowed_threads(card, 0);
2322         lcs_wait_for_threads(card, 0xffffffff);
2323         if (card->state != DEV_STATE_DOWN)
2324                 __lcs_shutdown_device(card->gdev, 1);
2325         return 0;
2326 }
2327
2328 static int lcs_pm_resume(struct lcs_card *card)
2329 {
2330         int rc = 0;
2331
2332         if (card->state == DEV_STATE_RECOVER)
2333                 rc = lcs_new_device(card->gdev);
2334         if (card->dev)
2335                 netif_device_attach(card->dev);
2336         if (rc) {
2337                 dev_warn(&card->gdev->dev, "The lcs device driver "
2338                         "failed to recover the device\n");
2339         }
2340         return rc;
2341 }
2342
2343 static int lcs_prepare(struct ccwgroup_device *gdev)
2344 {
2345         return 0;
2346 }
2347
2348 static void lcs_complete(struct ccwgroup_device *gdev)
2349 {
2350         return;
2351 }
2352
2353 static int lcs_freeze(struct ccwgroup_device *gdev)
2354 {
2355         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2356         return lcs_pm_suspend(card);
2357 }
2358
2359 static int lcs_thaw(struct ccwgroup_device *gdev)
2360 {
2361         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2362         return lcs_pm_resume(card);
2363 }
2364
2365 static int lcs_restore(struct ccwgroup_device *gdev)
2366 {
2367         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2368         return lcs_pm_resume(card);
2369 }
2370
2371 static struct ccw_device_id lcs_ids[] = {
2372         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2373         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2374         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2375         {},
2376 };
2377 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2378
2379 static struct ccw_driver lcs_ccw_driver = {
2380         .driver = {
2381                 .owner  = THIS_MODULE,
2382                 .name   = "lcs",
2383         },
2384         .ids    = lcs_ids,
2385         .probe  = ccwgroup_probe_ccwdev,
2386         .remove = ccwgroup_remove_ccwdev,
2387         .int_class = IOINT_LCS,
2388 };
2389
2390 /**
2391  * LCS ccwgroup driver registration
2392  */
2393 static struct ccwgroup_driver lcs_group_driver = {
2394         .driver = {
2395                 .owner  = THIS_MODULE,
2396                 .name   = "lcs",
2397         },
2398         .setup       = lcs_probe_device,
2399         .remove      = lcs_remove_device,
2400         .set_online  = lcs_new_device,
2401         .set_offline = lcs_shutdown_device,
2402         .prepare     = lcs_prepare,
2403         .complete    = lcs_complete,
2404         .freeze      = lcs_freeze,
2405         .thaw        = lcs_thaw,
2406         .restore     = lcs_restore,
2407 };
2408
2409 static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2410                                       const char *buf, size_t count)
2411 {
2412         int err;
2413         err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2414         return err ? err : count;
2415 }
2416 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2417
2418 static struct attribute *lcs_drv_attrs[] = {
2419         &driver_attr_group.attr,
2420         NULL,
2421 };
2422 static struct attribute_group lcs_drv_attr_group = {
2423         .attrs = lcs_drv_attrs,
2424 };
2425 static const struct attribute_group *lcs_drv_attr_groups[] = {
2426         &lcs_drv_attr_group,
2427         NULL,
2428 };
2429
2430 /**
2431  *  LCS Module/Kernel initialization function
2432  */
2433 static int
2434 __init lcs_init_module(void)
2435 {
2436         int rc;
2437
2438         pr_info("Loading %s\n", version);
2439         rc = lcs_register_debug_facility();
2440         LCS_DBF_TEXT(0, setup, "lcsinit");
2441         if (rc)
2442                 goto out_err;
2443         lcs_root_dev = root_device_register("lcs");
2444         rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2445         if (rc)
2446                 goto register_err;
2447         rc = ccw_driver_register(&lcs_ccw_driver);
2448         if (rc)
2449                 goto ccw_err;
2450         lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2451         rc = ccwgroup_driver_register(&lcs_group_driver);
2452         if (rc)
2453                 goto ccwgroup_err;
2454         return 0;
2455
2456 ccwgroup_err:
2457         ccw_driver_unregister(&lcs_ccw_driver);
2458 ccw_err:
2459         root_device_unregister(lcs_root_dev);
2460 register_err:
2461         lcs_unregister_debug_facility();
2462 out_err:
2463         pr_err("Initializing the lcs device driver failed\n");
2464         return rc;
2465 }
2466
2467
2468 /**
2469  *  LCS module cleanup function
2470  */
2471 static void
2472 __exit lcs_cleanup_module(void)
2473 {
2474         pr_info("Terminating lcs module.\n");
2475         LCS_DBF_TEXT(0, trace, "cleanup");
2476         ccwgroup_driver_unregister(&lcs_group_driver);
2477         ccw_driver_unregister(&lcs_ccw_driver);
2478         root_device_unregister(lcs_root_dev);
2479         lcs_unregister_debug_facility();
2480 }
2481
2482 module_init(lcs_init_module);
2483 module_exit(lcs_cleanup_module);
2484
2485 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2486 MODULE_LICENSE("GPL");
2487