Version:  2.0.40 2.2.26 2.4.37 2.6.39 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15

Linux/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         destroy_timer_on_stack(&timer);
903         LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
904         rc = reply->rc;
905         lcs_put_reply(reply);
906         return rc ? -EIO : 0;
907 }
908 
909 /**
910  * LCS startup command
911  */
912 static int
913 lcs_send_startup(struct lcs_card *card, __u8 initiator)
914 {
915         struct lcs_buffer *buffer;
916         struct lcs_cmd *cmd;
917 
918         LCS_DBF_TEXT(2, trace, "startup");
919         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
920         cmd = (struct lcs_cmd *) buffer->data;
921         cmd->cmd_code = LCS_CMD_STARTUP;
922         cmd->initiator = initiator;
923         cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
924         return lcs_send_lancmd(card, buffer, NULL);
925 }
926 
927 /**
928  * LCS shutdown command
929  */
930 static int
931 lcs_send_shutdown(struct lcs_card *card)
932 {
933         struct lcs_buffer *buffer;
934         struct lcs_cmd *cmd;
935 
936         LCS_DBF_TEXT(2, trace, "shutdown");
937         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
938         cmd = (struct lcs_cmd *) buffer->data;
939         cmd->cmd_code = LCS_CMD_SHUTDOWN;
940         cmd->initiator = LCS_INITIATOR_TCPIP;
941         return lcs_send_lancmd(card, buffer, NULL);
942 }
943 
944 /**
945  * LCS lanstat command
946  */
947 static void
948 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
949 {
950         LCS_DBF_TEXT(2, trace, "statcb");
951         memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
952 }
953 
954 static int
955 lcs_send_lanstat(struct lcs_card *card)
956 {
957         struct lcs_buffer *buffer;
958         struct lcs_cmd *cmd;
959 
960         LCS_DBF_TEXT(2,trace, "cmdstat");
961         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
962         cmd = (struct lcs_cmd *) buffer->data;
963         /* Setup lanstat command. */
964         cmd->cmd_code = LCS_CMD_LANSTAT;
965         cmd->initiator = LCS_INITIATOR_TCPIP;
966         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
967         cmd->cmd.lcs_std_cmd.portno = card->portno;
968         return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
969 }
970 
971 /**
972  * send stoplan command
973  */
974 static int
975 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
976 {
977         struct lcs_buffer *buffer;
978         struct lcs_cmd *cmd;
979 
980         LCS_DBF_TEXT(2, trace, "cmdstpln");
981         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
982         cmd = (struct lcs_cmd *) buffer->data;
983         cmd->cmd_code = LCS_CMD_STOPLAN;
984         cmd->initiator = initiator;
985         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
986         cmd->cmd.lcs_std_cmd.portno = card->portno;
987         return lcs_send_lancmd(card, buffer, NULL);
988 }
989 
990 /**
991  * send startlan command
992  */
993 static void
994 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
995 {
996         LCS_DBF_TEXT(2, trace, "srtlancb");
997         card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
998         card->portno = cmd->cmd.lcs_std_cmd.portno;
999 }
1000 
1001 static int
1002 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1003 {
1004         struct lcs_buffer *buffer;
1005         struct lcs_cmd *cmd;
1006 
1007         LCS_DBF_TEXT(2, trace, "cmdstaln");
1008         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1009         cmd = (struct lcs_cmd *) buffer->data;
1010         cmd->cmd_code = LCS_CMD_STARTLAN;
1011         cmd->initiator = initiator;
1012         cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1013         cmd->cmd.lcs_std_cmd.portno = card->portno;
1014         return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1015 }
1016 
1017 #ifdef CONFIG_IP_MULTICAST
1018 /**
1019  * send setipm command (Multicast)
1020  */
1021 static int
1022 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1023 {
1024         struct lcs_buffer *buffer;
1025         struct lcs_cmd *cmd;
1026 
1027         LCS_DBF_TEXT(2, trace, "cmdsetim");
1028         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1029         cmd = (struct lcs_cmd *) buffer->data;
1030         cmd->cmd_code = LCS_CMD_SETIPM;
1031         cmd->initiator = LCS_INITIATOR_TCPIP;
1032         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1033         cmd->cmd.lcs_qipassist.portno = card->portno;
1034         cmd->cmd.lcs_qipassist.version = 4;
1035         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1036         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1037                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1038         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1039         return lcs_send_lancmd(card, buffer, NULL);
1040 }
1041 
1042 /**
1043  * send delipm command (Multicast)
1044  */
1045 static int
1046 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1047 {
1048         struct lcs_buffer *buffer;
1049         struct lcs_cmd *cmd;
1050 
1051         LCS_DBF_TEXT(2, trace, "cmddelim");
1052         buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1053         cmd = (struct lcs_cmd *) buffer->data;
1054         cmd->cmd_code = LCS_CMD_DELIPM;
1055         cmd->initiator = LCS_INITIATOR_TCPIP;
1056         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1057         cmd->cmd.lcs_qipassist.portno = card->portno;
1058         cmd->cmd.lcs_qipassist.version = 4;
1059         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1060         memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1061                &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1062         LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1063         return lcs_send_lancmd(card, buffer, NULL);
1064 }
1065 
1066 /**
1067  * check if multicast is supported by LCS
1068  */
1069 static void
1070 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1071 {
1072         LCS_DBF_TEXT(2, trace, "chkmccb");
1073         card->ip_assists_supported =
1074                 cmd->cmd.lcs_qipassist.ip_assists_supported;
1075         card->ip_assists_enabled =
1076                 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1077 }
1078 
1079 static int
1080 lcs_check_multicast_support(struct lcs_card *card)
1081 {
1082         struct lcs_buffer *buffer;
1083         struct lcs_cmd *cmd;
1084         int rc;
1085 
1086         LCS_DBF_TEXT(2, trace, "cmdqipa");
1087         /* Send query ipassist. */
1088         buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1089         cmd = (struct lcs_cmd *) buffer->data;
1090         cmd->cmd_code = LCS_CMD_QIPASSIST;
1091         cmd->initiator = LCS_INITIATOR_TCPIP;
1092         cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1093         cmd->cmd.lcs_qipassist.portno = card->portno;
1094         cmd->cmd.lcs_qipassist.version = 4;
1095         cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1096         rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1097         if (rc != 0) {
1098                 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1099                 return -EOPNOTSUPP;
1100         }
1101         if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1102                 return 0;
1103         return -EOPNOTSUPP;
1104 }
1105 
1106 /**
1107  * set or del multicast address on LCS card
1108  */
1109 static void
1110 lcs_fix_multicast_list(struct lcs_card *card)
1111 {
1112         struct list_head failed_list;
1113         struct lcs_ipm_list *ipm, *tmp;
1114         unsigned long flags;
1115         int rc;
1116 
1117         LCS_DBF_TEXT(4,trace, "fixipm");
1118         INIT_LIST_HEAD(&failed_list);
1119         spin_lock_irqsave(&card->ipm_lock, flags);
1120 list_modified:
1121         list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1122                 switch (ipm->ipm_state) {
1123                 case LCS_IPM_STATE_SET_REQUIRED:
1124                         /* del from ipm_list so no one else can tamper with
1125                          * this entry */
1126                         list_del_init(&ipm->list);
1127                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1128                         rc = lcs_send_setipm(card, ipm);
1129                         spin_lock_irqsave(&card->ipm_lock, flags);
1130                         if (rc) {
1131                                 pr_info("Adding multicast address failed."
1132                                         " Table possibly full!\n");
1133                                 /* store ipm in failed list -> will be added
1134                                  * to ipm_list again, so a retry will be done
1135                                  * during the next call of this function */
1136                                 list_add_tail(&ipm->list, &failed_list);
1137                         } else {
1138                                 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1139                                 /* re-insert into ipm_list */
1140                                 list_add_tail(&ipm->list, &card->ipm_list);
1141                         }
1142                         goto list_modified;
1143                 case LCS_IPM_STATE_DEL_REQUIRED:
1144                         list_del(&ipm->list);
1145                         spin_unlock_irqrestore(&card->ipm_lock, flags);
1146                         lcs_send_delipm(card, ipm);
1147                         spin_lock_irqsave(&card->ipm_lock, flags);
1148                         kfree(ipm);
1149                         goto list_modified;
1150                 case LCS_IPM_STATE_ON_CARD:
1151                         break;
1152                 }
1153         }
1154         /* re-insert all entries from the failed_list into ipm_list */
1155         list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1156                 list_move_tail(&ipm->list, &card->ipm_list);
1157 
1158         spin_unlock_irqrestore(&card->ipm_lock, flags);
1159 }
1160 
1161 /**
1162  * get mac address for the relevant Multicast address
1163  */
1164 static void
1165 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1166 {
1167         LCS_DBF_TEXT(4,trace, "getmac");
1168         ip_eth_mc_map(ipm, mac);
1169 }
1170 
1171 /**
1172  * function called by net device to handle multicast address relevant things
1173  */
1174 static inline void
1175 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1176 {
1177         struct ip_mc_list *im4;
1178         struct list_head *l;
1179         struct lcs_ipm_list *ipm;
1180         unsigned long flags;
1181         char buf[MAX_ADDR_LEN];
1182 
1183         LCS_DBF_TEXT(4, trace, "remmclst");
1184         spin_lock_irqsave(&card->ipm_lock, flags);
1185         list_for_each(l, &card->ipm_list) {
1186                 ipm = list_entry(l, struct lcs_ipm_list, list);
1187                 for (im4 = rcu_dereference(in4_dev->mc_list);
1188                      im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1189                         lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1190                         if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1191                              (memcmp(buf, &ipm->ipm.mac_addr,
1192                                      LCS_MAC_LENGTH) == 0) )
1193                                 break;
1194                 }
1195                 if (im4 == NULL)
1196                         ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1197         }
1198         spin_unlock_irqrestore(&card->ipm_lock, flags);
1199 }
1200 
1201 static inline struct lcs_ipm_list *
1202 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1203 {
1204         struct lcs_ipm_list *tmp, *ipm = NULL;
1205         struct list_head *l;
1206         unsigned long flags;
1207 
1208         LCS_DBF_TEXT(4, trace, "chkmcent");
1209         spin_lock_irqsave(&card->ipm_lock, flags);
1210         list_for_each(l, &card->ipm_list) {
1211                 tmp = list_entry(l, struct lcs_ipm_list, list);
1212                 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1213                      (memcmp(buf, &tmp->ipm.mac_addr,
1214                              LCS_MAC_LENGTH) == 0) ) {
1215                         ipm = tmp;
1216                         break;
1217                 }
1218         }
1219         spin_unlock_irqrestore(&card->ipm_lock, flags);
1220         return ipm;
1221 }
1222 
1223 static inline void
1224 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1225 {
1226 
1227         struct ip_mc_list *im4;
1228         struct lcs_ipm_list *ipm;
1229         char buf[MAX_ADDR_LEN];
1230         unsigned long flags;
1231 
1232         LCS_DBF_TEXT(4, trace, "setmclst");
1233         for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1234              im4 = rcu_dereference(im4->next_rcu)) {
1235                 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1236                 ipm = lcs_check_addr_entry(card, im4, buf);
1237                 if (ipm != NULL)
1238                         continue;       /* Address already in list. */
1239                 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1240                 if (ipm == NULL) {
1241                         pr_info("Not enough memory to add"
1242                                 " new multicast entry!\n");
1243                         break;
1244                 }
1245                 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1246                 ipm->ipm.ip_addr = im4->multiaddr;
1247                 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1248                 spin_lock_irqsave(&card->ipm_lock, flags);
1249                 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1250                 list_add(&ipm->list, &card->ipm_list);
1251                 spin_unlock_irqrestore(&card->ipm_lock, flags);
1252         }
1253 }
1254 
1255 static int
1256 lcs_register_mc_addresses(void *data)
1257 {
1258         struct lcs_card *card;
1259         struct in_device *in4_dev;
1260 
1261         card = (struct lcs_card *) data;
1262 
1263         if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1264                 return 0;
1265         LCS_DBF_TEXT(4, trace, "regmulti");
1266 
1267         in4_dev = in_dev_get(card->dev);
1268         if (in4_dev == NULL)
1269                 goto out;
1270         rcu_read_lock();
1271         lcs_remove_mc_addresses(card,in4_dev);
1272         lcs_set_mc_addresses(card, in4_dev);
1273         rcu_read_unlock();
1274         in_dev_put(in4_dev);
1275 
1276         netif_carrier_off(card->dev);
1277         netif_tx_disable(card->dev);
1278         wait_event(card->write.wait_q,
1279                         (card->write.state != LCS_CH_STATE_RUNNING));
1280         lcs_fix_multicast_list(card);
1281         if (card->state == DEV_STATE_UP) {
1282                 netif_carrier_on(card->dev);
1283                 netif_wake_queue(card->dev);
1284         }
1285 out:
1286         lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1287         return 0;
1288 }
1289 #endif /* CONFIG_IP_MULTICAST */
1290 
1291 /**
1292  * function called by net device to
1293  * handle multicast address relevant things
1294  */
1295 static void
1296 lcs_set_multicast_list(struct net_device *dev)
1297 {
1298 #ifdef CONFIG_IP_MULTICAST
1299         struct lcs_card *card;
1300 
1301         LCS_DBF_TEXT(4, trace, "setmulti");
1302         card = (struct lcs_card *) dev->ml_priv;
1303 
1304         if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1305                 schedule_work(&card->kernel_thread_starter);
1306 #endif /* CONFIG_IP_MULTICAST */
1307 }
1308 
1309 static long
1310 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1311 {
1312         if (!IS_ERR(irb))
1313                 return 0;
1314 
1315         switch (PTR_ERR(irb)) {
1316         case -EIO:
1317                 dev_warn(&cdev->dev,
1318                         "An I/O-error occurred on the LCS device\n");
1319                 LCS_DBF_TEXT(2, trace, "ckirberr");
1320                 LCS_DBF_TEXT_(2, trace, "  rc%d", -EIO);
1321                 break;
1322         case -ETIMEDOUT:
1323                 dev_warn(&cdev->dev,
1324                         "A command timed out on the LCS device\n");
1325                 LCS_DBF_TEXT(2, trace, "ckirberr");
1326                 LCS_DBF_TEXT_(2, trace, "  rc%d", -ETIMEDOUT);
1327                 break;
1328         default:
1329                 dev_warn(&cdev->dev,
1330                         "An error occurred on the LCS device, rc=%ld\n",
1331                         PTR_ERR(irb));
1332                 LCS_DBF_TEXT(2, trace, "ckirberr");
1333                 LCS_DBF_TEXT(2, trace, "  rc???");
1334         }
1335         return PTR_ERR(irb);
1336 }
1337 
1338 static int
1339 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1340 {
1341         int dstat, cstat;
1342         char *sense;
1343 
1344         sense = (char *) irb->ecw;
1345         cstat = irb->scsw.cmd.cstat;
1346         dstat = irb->scsw.cmd.dstat;
1347 
1348         if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1349                      SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1350                      SCHN_STAT_PROT_CHECK   | SCHN_STAT_PROG_CHECK)) {
1351                 LCS_DBF_TEXT(2, trace, "CGENCHK");
1352                 return 1;
1353         }
1354         if (dstat & DEV_STAT_UNIT_CHECK) {
1355                 if (sense[LCS_SENSE_BYTE_1] &
1356                     LCS_SENSE_RESETTING_EVENT) {
1357                         LCS_DBF_TEXT(2, trace, "REVIND");
1358                         return 1;
1359                 }
1360                 if (sense[LCS_SENSE_BYTE_0] &
1361                     LCS_SENSE_CMD_REJECT) {
1362                         LCS_DBF_TEXT(2, trace, "CMDREJ");
1363                         return 0;
1364                 }
1365                 if ((!sense[LCS_SENSE_BYTE_0]) &&
1366                     (!sense[LCS_SENSE_BYTE_1]) &&
1367                     (!sense[LCS_SENSE_BYTE_2]) &&
1368                     (!sense[LCS_SENSE_BYTE_3])) {
1369                         LCS_DBF_TEXT(2, trace, "ZEROSEN");
1370                         return 0;
1371                 }
1372                 LCS_DBF_TEXT(2, trace, "DGENCHK");
1373                 return 1;
1374         }
1375         return 0;
1376 }
1377 
1378 static void
1379 lcs_schedule_recovery(struct lcs_card *card)
1380 {
1381         LCS_DBF_TEXT(2, trace, "startrec");
1382         if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1383                 schedule_work(&card->kernel_thread_starter);
1384 }
1385 
1386 /**
1387  * IRQ Handler for LCS channels
1388  */
1389 static void
1390 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1391 {
1392         struct lcs_card *card;
1393         struct lcs_channel *channel;
1394         int rc, index;
1395         int cstat, dstat;
1396 
1397         if (lcs_check_irb_error(cdev, irb))
1398                 return;
1399 
1400         card = CARD_FROM_DEV(cdev);
1401         if (card->read.ccwdev == cdev)
1402                 channel = &card->read;
1403         else
1404                 channel = &card->write;
1405 
1406         cstat = irb->scsw.cmd.cstat;
1407         dstat = irb->scsw.cmd.dstat;
1408         LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1409         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1410                       irb->scsw.cmd.dstat);
1411         LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1412                       irb->scsw.cmd.actl);
1413 
1414         /* Check for channel and device errors presented */
1415         rc = lcs_get_problem(cdev, irb);
1416         if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1417                 dev_warn(&cdev->dev,
1418                         "The LCS device stopped because of an error,"
1419                         " dstat=0x%X, cstat=0x%X \n",
1420                             dstat, cstat);
1421                 if (rc) {
1422                         channel->state = LCS_CH_STATE_ERROR;
1423                 }
1424         }
1425         if (channel->state == LCS_CH_STATE_ERROR) {
1426                 lcs_schedule_recovery(card);
1427                 wake_up(&card->wait_q);
1428                 return;
1429         }
1430         /* How far in the ccw chain have we processed? */
1431         if ((channel->state != LCS_CH_STATE_INIT) &&
1432             (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1433             (irb->scsw.cmd.cpa != 0)) {
1434                 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1435                         - channel->ccws;
1436                 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1437                     (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1438                         /* Bloody io subsystem tells us lies about cpa... */
1439                         index = (index - 1) & (LCS_NUM_BUFFS - 1);
1440                 while (channel->io_idx != index) {
1441                         __lcs_processed_buffer(channel,
1442                                                channel->iob + channel->io_idx);
1443                         channel->io_idx =
1444                                 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1445                 }
1446         }
1447 
1448         if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1449             (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1450             (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1451                 /* Mark channel as stopped. */
1452                 channel->state = LCS_CH_STATE_STOPPED;
1453         else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1454                 /* CCW execution stopped on a suspend bit. */
1455                 channel->state = LCS_CH_STATE_SUSPENDED;
1456         if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1457                 if (irb->scsw.cmd.cc != 0) {
1458                         ccw_device_halt(channel->ccwdev, (addr_t) channel);
1459                         return;
1460                 }
1461                 /* The channel has been stopped by halt_IO. */
1462                 channel->state = LCS_CH_STATE_HALTED;
1463         }
1464         if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1465                 channel->state = LCS_CH_STATE_CLEARED;
1466         /* Do the rest in the tasklet. */
1467         tasklet_schedule(&channel->irq_tasklet);
1468 }
1469 
1470 /**
1471  * Tasklet for IRQ handler
1472  */
1473 static void
1474 lcs_tasklet(unsigned long data)
1475 {
1476         unsigned long flags;
1477         struct lcs_channel *channel;
1478         struct lcs_buffer *iob;
1479         int buf_idx;
1480 
1481         channel = (struct lcs_channel *) data;
1482         LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1483 
1484         /* Check for processed buffers. */
1485         iob = channel->iob;
1486         buf_idx = channel->buf_idx;
1487         while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1488                 /* Do the callback thing. */
1489                 if (iob[buf_idx].callback != NULL)
1490                         iob[buf_idx].callback(channel, iob + buf_idx);
1491                 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1492         }
1493         channel->buf_idx = buf_idx;
1494 
1495         if (channel->state == LCS_CH_STATE_STOPPED)
1496                 lcs_start_channel(channel);
1497         spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1498         if (channel->state == LCS_CH_STATE_SUSPENDED &&
1499             channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1500                 __lcs_resume_channel(channel);
1501         spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1502 
1503         /* Something happened on the channel. Wake up waiters. */
1504         wake_up(&channel->wait_q);
1505 }
1506 
1507 /**
1508  * Finish current tx buffer and make it ready for transmit.
1509  */
1510 static void
1511 __lcs_emit_txbuffer(struct lcs_card *card)
1512 {
1513         LCS_DBF_TEXT(5, trace, "emittx");
1514         *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1515         card->tx_buffer->count += 2;
1516         lcs_ready_buffer(&card->write, card->tx_buffer);
1517         card->tx_buffer = NULL;
1518         card->tx_emitted++;
1519 }
1520 
1521 /**
1522  * Callback for finished tx buffers.
1523  */
1524 static void
1525 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1526 {
1527         struct lcs_card *card;
1528 
1529         LCS_DBF_TEXT(5, trace, "txbuffcb");
1530         /* Put buffer back to pool. */
1531         lcs_release_buffer(channel, buffer);
1532         card = container_of(channel, struct lcs_card, write);
1533         if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1534                 netif_wake_queue(card->dev);
1535         spin_lock(&card->lock);
1536         card->tx_emitted--;
1537         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1538                 /*
1539                  * Last running tx buffer has finished. Submit partially
1540                  * filled current buffer.
1541                  */
1542                 __lcs_emit_txbuffer(card);
1543         spin_unlock(&card->lock);
1544 }
1545 
1546 /**
1547  * Packet transmit function called by network stack
1548  */
1549 static int
1550 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1551                  struct net_device *dev)
1552 {
1553         struct lcs_header *header;
1554         int rc = NETDEV_TX_OK;
1555 
1556         LCS_DBF_TEXT(5, trace, "hardxmit");
1557         if (skb == NULL) {
1558                 card->stats.tx_dropped++;
1559                 card->stats.tx_errors++;
1560                 return NETDEV_TX_OK;
1561         }
1562         if (card->state != DEV_STATE_UP) {
1563                 dev_kfree_skb(skb);
1564                 card->stats.tx_dropped++;
1565                 card->stats.tx_errors++;
1566                 card->stats.tx_carrier_errors++;
1567                 return NETDEV_TX_OK;
1568         }
1569         if (skb->protocol == htons(ETH_P_IPV6)) {
1570                 dev_kfree_skb(skb);
1571                 return NETDEV_TX_OK;
1572         }
1573         netif_stop_queue(card->dev);
1574         spin_lock(&card->lock);
1575         if (card->tx_buffer != NULL &&
1576             card->tx_buffer->count + sizeof(struct lcs_header) +
1577             skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1578                 /* skb too big for current tx buffer. */
1579                 __lcs_emit_txbuffer(card);
1580         if (card->tx_buffer == NULL) {
1581                 /* Get new tx buffer */
1582                 card->tx_buffer = lcs_get_buffer(&card->write);
1583                 if (card->tx_buffer == NULL) {
1584                         card->stats.tx_dropped++;
1585                         rc = NETDEV_TX_BUSY;
1586                         goto out;
1587                 }
1588                 card->tx_buffer->callback = lcs_txbuffer_cb;
1589                 card->tx_buffer->count = 0;
1590         }
1591         header = (struct lcs_header *)
1592                 (card->tx_buffer->data + card->tx_buffer->count);
1593         card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1594         header->offset = card->tx_buffer->count;
1595         header->type = card->lan_type;
1596         header->slot = card->portno;
1597         skb_copy_from_linear_data(skb, header + 1, skb->len);
1598         spin_unlock(&card->lock);
1599         card->stats.tx_bytes += skb->len;
1600         card->stats.tx_packets++;
1601         dev_kfree_skb(skb);
1602         netif_wake_queue(card->dev);
1603         spin_lock(&card->lock);
1604         if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1605                 /* If this is the first tx buffer emit it immediately. */
1606                 __lcs_emit_txbuffer(card);
1607 out:
1608         spin_unlock(&card->lock);
1609         return rc;
1610 }
1611 
1612 static int
1613 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1614 {
1615         struct lcs_card *card;
1616         int rc;
1617 
1618         LCS_DBF_TEXT(5, trace, "pktxmit");
1619         card = (struct lcs_card *) dev->ml_priv;
1620         rc = __lcs_start_xmit(card, skb, dev);
1621         return rc;
1622 }
1623 
1624 /**
1625  * send startlan and lanstat command to make LCS device ready
1626  */
1627 static int
1628 lcs_startlan_auto(struct lcs_card *card)
1629 {
1630         int rc;
1631 
1632         LCS_DBF_TEXT(2, trace, "strtauto");
1633 #ifdef CONFIG_ETHERNET
1634         card->lan_type = LCS_FRAME_TYPE_ENET;
1635         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1636         if (rc == 0)
1637                 return 0;
1638 
1639 #endif
1640 #ifdef CONFIG_FDDI
1641         card->lan_type = LCS_FRAME_TYPE_FDDI;
1642         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1643         if (rc == 0)
1644                 return 0;
1645 #endif
1646         return -EIO;
1647 }
1648 
1649 static int
1650 lcs_startlan(struct lcs_card *card)
1651 {
1652         int rc, i;
1653 
1654         LCS_DBF_TEXT(2, trace, "startlan");
1655         rc = 0;
1656         if (card->portno != LCS_INVALID_PORT_NO) {
1657                 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1658                         rc = lcs_startlan_auto(card);
1659                 else
1660                         rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1661         } else {
1662                 for (i = 0; i <= 16; i++) {
1663                         card->portno = i;
1664                         if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1665                                 rc = lcs_send_startlan(card,
1666                                                        LCS_INITIATOR_TCPIP);
1667                         else
1668                                 /* autodetecting lan type */
1669                                 rc = lcs_startlan_auto(card);
1670                         if (rc == 0)
1671                                 break;
1672                 }
1673         }
1674         if (rc == 0)
1675                 return lcs_send_lanstat(card);
1676         return rc;
1677 }
1678 
1679 /**
1680  * LCS detect function
1681  * setup channels and make them I/O ready
1682  */
1683 static int
1684 lcs_detect(struct lcs_card *card)
1685 {
1686         int rc = 0;
1687 
1688         LCS_DBF_TEXT(2, setup, "lcsdetct");
1689         /* start/reset card */
1690         if (card->dev)
1691                 netif_stop_queue(card->dev);
1692         rc = lcs_stop_channels(card);
1693         if (rc == 0) {
1694                 rc = lcs_start_channels(card);
1695                 if (rc == 0) {
1696                         rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1697                         if (rc == 0)
1698                                 rc = lcs_startlan(card);
1699                 }
1700         }
1701         if (rc == 0) {
1702                 card->state = DEV_STATE_UP;
1703         } else {
1704                 card->state = DEV_STATE_DOWN;
1705                 card->write.state = LCS_CH_STATE_INIT;
1706                 card->read.state =  LCS_CH_STATE_INIT;
1707         }
1708         return rc;
1709 }
1710 
1711 /**
1712  * LCS Stop card
1713  */
1714 static int
1715 lcs_stopcard(struct lcs_card *card)
1716 {
1717         int rc;
1718 
1719         LCS_DBF_TEXT(3, setup, "stopcard");
1720 
1721         if (card->read.state != LCS_CH_STATE_STOPPED &&
1722             card->write.state != LCS_CH_STATE_STOPPED &&
1723             card->read.state != LCS_CH_STATE_ERROR &&
1724             card->write.state != LCS_CH_STATE_ERROR &&
1725             card->state == DEV_STATE_UP) {
1726                 lcs_clear_multicast_list(card);
1727                 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1728                 rc = lcs_send_shutdown(card);
1729         }
1730         rc = lcs_stop_channels(card);
1731         card->state = DEV_STATE_DOWN;
1732 
1733         return rc;
1734 }
1735 
1736 /**
1737  * Kernel Thread helper functions for LGW initiated commands
1738  */
1739 static void
1740 lcs_start_kernel_thread(struct work_struct *work)
1741 {
1742         struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1743         LCS_DBF_TEXT(5, trace, "krnthrd");
1744         if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1745                 kthread_run(lcs_recovery, card, "lcs_recover");
1746 #ifdef CONFIG_IP_MULTICAST
1747         if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1748                 kthread_run(lcs_register_mc_addresses, card, "regipm");
1749 #endif
1750 }
1751 
1752 /**
1753  * Process control frames.
1754  */
1755 static void
1756 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1757 {
1758         LCS_DBF_TEXT(5, trace, "getctrl");
1759         if (cmd->initiator == LCS_INITIATOR_LGW) {
1760                 switch(cmd->cmd_code) {
1761                 case LCS_CMD_STARTUP:
1762                 case LCS_CMD_STARTLAN:
1763                         lcs_schedule_recovery(card);
1764                         break;
1765                 case LCS_CMD_STOPLAN:
1766                         pr_warning("Stoplan for %s initiated by LGW.\n",
1767                                    card->dev->name);
1768                         if (card->dev)
1769                                 netif_carrier_off(card->dev);
1770                         break;
1771                 default:
1772                         LCS_DBF_TEXT(5, trace, "noLGWcmd");
1773                         break;
1774                 }
1775         } else
1776                 lcs_notify_lancmd_waiters(card, cmd);
1777 }
1778 
1779 /**
1780  * Unpack network packet.
1781  */
1782 static void
1783 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1784 {
1785         struct sk_buff *skb;
1786 
1787         LCS_DBF_TEXT(5, trace, "getskb");
1788         if (card->dev == NULL ||
1789             card->state != DEV_STATE_UP)
1790                 /* The card isn't up. Ignore the packet. */
1791                 return;
1792 
1793         skb = dev_alloc_skb(skb_len);
1794         if (skb == NULL) {
1795                 dev_err(&card->dev->dev,
1796                         " Allocating a socket buffer to interface %s failed\n",
1797                           card->dev->name);
1798                 card->stats.rx_dropped++;
1799                 return;
1800         }
1801         memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1802         skb->protocol = card->lan_type_trans(skb, card->dev);
1803         card->stats.rx_bytes += skb_len;
1804         card->stats.rx_packets++;
1805         if (skb->protocol == htons(ETH_P_802_2))
1806                 *((__u32 *)skb->cb) = ++card->pkt_seq;
1807         netif_rx(skb);
1808 }
1809 
1810 /**
1811  * LCS main routine to get packets and lancmd replies from the buffers
1812  */
1813 static void
1814 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1815 {
1816         struct lcs_card *card;
1817         struct lcs_header *lcs_hdr;
1818         __u16 offset;
1819 
1820         LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1821         lcs_hdr = (struct lcs_header *) buffer->data;
1822         if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1823                 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1824                 return;
1825         }
1826         card = container_of(channel, struct lcs_card, read);
1827         offset = 0;
1828         while (lcs_hdr->offset != 0) {
1829                 if (lcs_hdr->offset <= 0 ||
1830                     lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1831                     lcs_hdr->offset < offset) {
1832                         /* Offset invalid. */
1833                         card->stats.rx_length_errors++;
1834                         card->stats.rx_errors++;
1835                         return;
1836                 }
1837                 /* What kind of frame is it? */
1838                 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1839                         /* Control frame. */
1840                         lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1841                 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1842                          lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1843                          lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1844                         /* Normal network packet. */
1845                         lcs_get_skb(card, (char *)(lcs_hdr + 1),
1846                                     lcs_hdr->offset - offset -
1847                                     sizeof(struct lcs_header));
1848                 else
1849                         /* Unknown frame type. */
1850                         ; // FIXME: error message ?
1851                 /* Proceed to next frame. */
1852                 offset = lcs_hdr->offset;
1853                 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1854                 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1855         }
1856         /* The buffer is now empty. Make it ready again. */
1857         lcs_ready_buffer(&card->read, buffer);
1858 }
1859 
1860 /**
1861  * get network statistics for ifconfig and other user programs
1862  */
1863 static struct net_device_stats *
1864 lcs_getstats(struct net_device *dev)
1865 {
1866         struct lcs_card *card;
1867 
1868         LCS_DBF_TEXT(4, trace, "netstats");
1869         card = (struct lcs_card *) dev->ml_priv;
1870         return &card->stats;
1871 }
1872 
1873 /**
1874  * stop lcs device
1875  * This function will be called by user doing ifconfig xxx down
1876  */
1877 static int
1878 lcs_stop_device(struct net_device *dev)
1879 {
1880         struct lcs_card *card;
1881         int rc;
1882 
1883         LCS_DBF_TEXT(2, trace, "stopdev");
1884         card   = (struct lcs_card *) dev->ml_priv;
1885         netif_carrier_off(dev);
1886         netif_tx_disable(dev);
1887         dev->flags &= ~IFF_UP;
1888         wait_event(card->write.wait_q,
1889                 (card->write.state != LCS_CH_STATE_RUNNING));
1890         rc = lcs_stopcard(card);
1891         if (rc)
1892                 dev_err(&card->dev->dev,
1893                         " Shutting down the LCS device failed\n ");
1894         return rc;
1895 }
1896 
1897 /**
1898  * start lcs device and make it runnable
1899  * This function will be called by user doing ifconfig xxx up
1900  */
1901 static int
1902 lcs_open_device(struct net_device *dev)
1903 {
1904         struct lcs_card *card;
1905         int rc;
1906 
1907         LCS_DBF_TEXT(2, trace, "opendev");
1908         card = (struct lcs_card *) dev->ml_priv;
1909         /* initialize statistics */
1910         rc = lcs_detect(card);
1911         if (rc) {
1912                 pr_err("Error in opening device!\n");
1913 
1914         } else {
1915                 dev->flags |= IFF_UP;
1916                 netif_carrier_on(dev);
1917                 netif_wake_queue(dev);
1918                 card->state = DEV_STATE_UP;
1919         }
1920         return rc;
1921 }
1922 
1923 /**
1924  * show function for portno called by cat or similar things
1925  */
1926 static ssize_t
1927 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1928 {
1929         struct lcs_card *card;
1930 
1931         card = dev_get_drvdata(dev);
1932 
1933         if (!card)
1934                 return 0;
1935 
1936         return sprintf(buf, "%d\n", card->portno);
1937 }
1938 
1939 /**
1940  * store the value which is piped to file portno
1941  */
1942 static ssize_t
1943 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1944 {
1945         struct lcs_card *card;
1946         int value;
1947 
1948         card = dev_get_drvdata(dev);
1949 
1950         if (!card)
1951                 return 0;
1952 
1953         sscanf(buf, "%u", &value);
1954         /* TODO: sanity checks */
1955         card->portno = value;
1956 
1957         return count;
1958 
1959 }
1960 
1961 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1962 
1963 static const char *lcs_type[] = {
1964         "not a channel",
1965         "2216 parallel",
1966         "2216 channel",
1967         "OSA LCS card",
1968         "unknown channel type",
1969         "unsupported channel type",
1970 };
1971 
1972 static ssize_t
1973 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1974 {
1975         struct ccwgroup_device *cgdev;
1976 
1977         cgdev = to_ccwgroupdev(dev);
1978         if (!cgdev)
1979                 return -ENODEV;
1980 
1981         return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1982 }
1983 
1984 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1985 
1986 static ssize_t
1987 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1988 {
1989         struct lcs_card *card;
1990 
1991         card = dev_get_drvdata(dev);
1992 
1993         return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1994 }
1995 
1996 static ssize_t
1997 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1998 {
1999         struct lcs_card *card;
2000         int value;
2001 
2002         card = dev_get_drvdata(dev);
2003 
2004         if (!card)
2005                 return 0;
2006 
2007         sscanf(buf, "%u", &value);
2008         /* TODO: sanity checks */
2009         card->lancmd_timeout = value;
2010 
2011         return count;
2012 
2013 }
2014 
2015 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2016 
2017 static ssize_t
2018 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2019                       const char *buf, size_t count)
2020 {
2021         struct lcs_card *card = dev_get_drvdata(dev);
2022         char *tmp;
2023         int i;
2024 
2025         if (!card)
2026                 return -EINVAL;
2027         if (card->state != DEV_STATE_UP)
2028                 return -EPERM;
2029         i = simple_strtoul(buf, &tmp, 16);
2030         if (i == 1)
2031                 lcs_schedule_recovery(card);
2032         return count;
2033 }
2034 
2035 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2036 
2037 static struct attribute * lcs_attrs[] = {
2038         &dev_attr_portno.attr,
2039         &dev_attr_type.attr,
2040         &dev_attr_lancmd_timeout.attr,
2041         &dev_attr_recover.attr,
2042         NULL,
2043 };
2044 static struct attribute_group lcs_attr_group = {
2045         .attrs = lcs_attrs,
2046 };
2047 static const struct attribute_group *lcs_attr_groups[] = {
2048         &lcs_attr_group,
2049         NULL,
2050 };
2051 static const struct device_type lcs_devtype = {
2052         .name = "lcs",
2053         .groups = lcs_attr_groups,
2054 };
2055 
2056 /**
2057  * lcs_probe_device is called on establishing a new ccwgroup_device.
2058  */
2059 static int
2060 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2061 {
2062         struct lcs_card *card;
2063 
2064         if (!get_device(&ccwgdev->dev))
2065                 return -ENODEV;
2066 
2067         LCS_DBF_TEXT(2, setup, "add_dev");
2068         card = lcs_alloc_card();
2069         if (!card) {
2070                 LCS_DBF_TEXT_(2, setup, "  rc%d", -ENOMEM);
2071                 put_device(&ccwgdev->dev);
2072                 return -ENOMEM;
2073         }
2074         dev_set_drvdata(&ccwgdev->dev, card);
2075         ccwgdev->cdev[0]->handler = lcs_irq;
2076         ccwgdev->cdev[1]->handler = lcs_irq;
2077         card->gdev = ccwgdev;
2078         INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2079         card->thread_start_mask = 0;
2080         card->thread_allowed_mask = 0;
2081         card->thread_running_mask = 0;
2082         ccwgdev->dev.type = &lcs_devtype;
2083 
2084         return 0;
2085 }
2086 
2087 static int
2088 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2089 {
2090         struct lcs_card *card;
2091 
2092         LCS_DBF_TEXT(2, setup, "regnetdv");
2093         card = dev_get_drvdata(&ccwgdev->dev);
2094         if (card->dev->reg_state != NETREG_UNINITIALIZED)
2095                 return 0;
2096         SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2097         return register_netdev(card->dev);
2098 }
2099 
2100 /**
2101  * lcs_new_device will be called by setting the group device online.
2102  */
2103 static const struct net_device_ops lcs_netdev_ops = {
2104         .ndo_open               = lcs_open_device,
2105         .ndo_stop               = lcs_stop_device,
2106         .ndo_get_stats          = lcs_getstats,
2107         .ndo_start_xmit         = lcs_start_xmit,
2108 };
2109 
2110 static const struct net_device_ops lcs_mc_netdev_ops = {
2111         .ndo_open               = lcs_open_device,
2112         .ndo_stop               = lcs_stop_device,
2113         .ndo_get_stats          = lcs_getstats,
2114         .ndo_start_xmit         = lcs_start_xmit,
2115         .ndo_set_rx_mode        = lcs_set_multicast_list,
2116 };
2117 
2118 static int
2119 lcs_new_device(struct ccwgroup_device *ccwgdev)
2120 {
2121         struct  lcs_card *card;
2122         struct net_device *dev=NULL;
2123         enum lcs_dev_states recover_state;
2124         int rc;
2125 
2126         card = dev_get_drvdata(&ccwgdev->dev);
2127         if (!card)
2128                 return -ENODEV;
2129 
2130         LCS_DBF_TEXT(2, setup, "newdev");
2131         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2132         card->read.ccwdev  = ccwgdev->cdev[0];
2133         card->write.ccwdev = ccwgdev->cdev[1];
2134 
2135         recover_state = card->state;
2136         rc = ccw_device_set_online(card->read.ccwdev);
2137         if (rc)
2138                 goto out_err;
2139         rc = ccw_device_set_online(card->write.ccwdev);
2140         if (rc)
2141                 goto out_werr;
2142 
2143         LCS_DBF_TEXT(3, setup, "lcsnewdv");
2144 
2145         lcs_setup_card(card);
2146         rc = lcs_detect(card);
2147         if (rc) {
2148                 LCS_DBF_TEXT(2, setup, "dtctfail");
2149                 dev_err(&card->dev->dev,
2150                         "Detecting a network adapter for LCS devices"
2151                         " failed with rc=%d (0x%x)\n", rc, rc);
2152                 lcs_stopcard(card);
2153                 goto out;
2154         }
2155         if (card->dev) {
2156                 LCS_DBF_TEXT(2, setup, "samedev");
2157                 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2158                 goto netdev_out;
2159         }
2160         switch (card->lan_type) {
2161 #ifdef CONFIG_ETHERNET
2162         case LCS_FRAME_TYPE_ENET:
2163                 card->lan_type_trans = eth_type_trans;
2164                 dev = alloc_etherdev(0);
2165                 break;
2166 #endif
2167 #ifdef CONFIG_FDDI
2168         case LCS_FRAME_TYPE_FDDI:
2169                 card->lan_type_trans = fddi_type_trans;
2170                 dev = alloc_fddidev(0);
2171                 break;
2172 #endif
2173         default:
2174                 LCS_DBF_TEXT(3, setup, "errinit");
2175                 pr_err(" Initialization failed\n");
2176                 goto out;
2177         }
2178         if (!dev)
2179                 goto out;
2180         card->dev = dev;
2181         card->dev->ml_priv = card;
2182         card->dev->netdev_ops = &lcs_netdev_ops;
2183         memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2184 #ifdef CONFIG_IP_MULTICAST
2185         if (!lcs_check_multicast_support(card))
2186                 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2187 #endif
2188 netdev_out:
2189         lcs_set_allowed_threads(card,0xffffffff);
2190         if (recover_state == DEV_STATE_RECOVER) {
2191                 lcs_set_multicast_list(card->dev);
2192                 card->dev->flags |= IFF_UP;
2193                 netif_carrier_on(card->dev);
2194                 netif_wake_queue(card->dev);
2195                 card->state = DEV_STATE_UP;
2196         } else {
2197                 lcs_stopcard(card);
2198         }
2199 
2200         if (lcs_register_netdev(ccwgdev) != 0)
2201                 goto out;
2202 
2203         /* Print out supported assists: IPv6 */
2204         pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2205                 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2206                 "with" : "without");
2207         /* Print out supported assist: Multicast */
2208         pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2209                 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2210                 "with" : "without");
2211         return 0;
2212 out:
2213 
2214         ccw_device_set_offline(card->write.ccwdev);
2215 out_werr:
2216         ccw_device_set_offline(card->read.ccwdev);
2217 out_err:
2218         return -ENODEV;
2219 }
2220 
2221 /**
2222  * lcs_shutdown_device, called when setting the group device offline.
2223  */
2224 static int
2225 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2226 {
2227         struct lcs_card *card;
2228         enum lcs_dev_states recover_state;
2229         int ret = 0, ret2 = 0, ret3 = 0;
2230 
2231         LCS_DBF_TEXT(3, setup, "shtdndev");
2232         card = dev_get_drvdata(&ccwgdev->dev);
2233         if (!card)
2234                 return -ENODEV;
2235         if (recovery_mode == 0) {
2236                 lcs_set_allowed_threads(card, 0);
2237                 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2238                         return -ERESTARTSYS;
2239         }
2240         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2241         recover_state = card->state;
2242 
2243         ret = lcs_stop_device(card->dev);
2244         ret2 = ccw_device_set_offline(card->read.ccwdev);
2245         ret3 = ccw_device_set_offline(card->write.ccwdev);
2246         if (!ret)
2247                 ret = (ret2) ? ret2 : ret3;
2248         if (ret)
2249                 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2250         if (recover_state == DEV_STATE_UP) {
2251                 card->state = DEV_STATE_RECOVER;
2252         }
2253         return 0;
2254 }
2255 
2256 static int
2257 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2258 {
2259         return __lcs_shutdown_device(ccwgdev, 0);
2260 }
2261 
2262 /**
2263  * drive lcs recovery after startup and startlan initiated by Lan Gateway
2264  */
2265 static int
2266 lcs_recovery(void *ptr)
2267 {
2268         struct lcs_card *card;
2269         struct ccwgroup_device *gdev;
2270         int rc;
2271 
2272         card = (struct lcs_card *) ptr;
2273 
2274         LCS_DBF_TEXT(4, trace, "recover1");
2275         if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2276                 return 0;
2277         LCS_DBF_TEXT(4, trace, "recover2");
2278         gdev = card->gdev;
2279         dev_warn(&gdev->dev,
2280                 "A recovery process has been started for the LCS device\n");
2281         rc = __lcs_shutdown_device(gdev, 1);
2282         rc = lcs_new_device(gdev);
2283         if (!rc)
2284                 pr_info("Device %s successfully recovered!\n",
2285                         card->dev->name);
2286         else
2287                 pr_info("Device %s could not be recovered!\n",
2288                         card->dev->name);
2289         lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2290         return 0;
2291 }
2292 
2293 /**
2294  * lcs_remove_device, free buffers and card
2295  */
2296 static void
2297 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2298 {
2299         struct lcs_card *card;
2300 
2301         card = dev_get_drvdata(&ccwgdev->dev);
2302         if (!card)
2303                 return;
2304 
2305         LCS_DBF_TEXT(3, setup, "remdev");
2306         LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2307         if (ccwgdev->state == CCWGROUP_ONLINE) {
2308                 lcs_shutdown_device(ccwgdev);
2309         }
2310         if (card->dev)
2311                 unregister_netdev(card->dev);
2312         lcs_cleanup_card(card);
2313         lcs_free_card(card);
2314         dev_set_drvdata(&ccwgdev->dev, NULL);
2315         put_device(&ccwgdev->dev);
2316 }
2317 
2318 static int lcs_pm_suspend(struct lcs_card *card)
2319 {
2320         if (card->dev)
2321                 netif_device_detach(card->dev);
2322         lcs_set_allowed_threads(card, 0);
2323         lcs_wait_for_threads(card, 0xffffffff);
2324         if (card->state != DEV_STATE_DOWN)
2325                 __lcs_shutdown_device(card->gdev, 1);
2326         return 0;
2327 }
2328 
2329 static int lcs_pm_resume(struct lcs_card *card)
2330 {
2331         int rc = 0;
2332 
2333         if (card->state == DEV_STATE_RECOVER)
2334                 rc = lcs_new_device(card->gdev);
2335         if (card->dev)
2336                 netif_device_attach(card->dev);
2337         if (rc) {
2338                 dev_warn(&card->gdev->dev, "The lcs device driver "
2339                         "failed to recover the device\n");
2340         }
2341         return rc;
2342 }
2343 
2344 static int lcs_prepare(struct ccwgroup_device *gdev)
2345 {
2346         return 0;
2347 }
2348 
2349 static void lcs_complete(struct ccwgroup_device *gdev)
2350 {
2351         return;
2352 }
2353 
2354 static int lcs_freeze(struct ccwgroup_device *gdev)
2355 {
2356         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2357         return lcs_pm_suspend(card);
2358 }
2359 
2360 static int lcs_thaw(struct ccwgroup_device *gdev)
2361 {
2362         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2363         return lcs_pm_resume(card);
2364 }
2365 
2366 static int lcs_restore(struct ccwgroup_device *gdev)
2367 {
2368         struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2369         return lcs_pm_resume(card);
2370 }
2371 
2372 static struct ccw_device_id lcs_ids[] = {
2373         {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2374         {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2375         {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2376         {},
2377 };
2378 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2379 
2380 static struct ccw_driver lcs_ccw_driver = {
2381         .driver = {
2382                 .owner  = THIS_MODULE,
2383                 .name   = "lcs",
2384         },
2385         .ids    = lcs_ids,
2386         .probe  = ccwgroup_probe_ccwdev,
2387         .remove = ccwgroup_remove_ccwdev,
2388         .int_class = IRQIO_LCS,
2389 };
2390 
2391 /**
2392  * LCS ccwgroup driver registration
2393  */
2394 static struct ccwgroup_driver lcs_group_driver = {
2395         .driver = {
2396                 .owner  = THIS_MODULE,
2397                 .name   = "lcs",
2398         },
2399         .setup       = lcs_probe_device,
2400         .remove      = lcs_remove_device,
2401         .set_online  = lcs_new_device,
2402         .set_offline = lcs_shutdown_device,
2403         .prepare     = lcs_prepare,
2404         .complete    = lcs_complete,
2405         .freeze      = lcs_freeze,
2406         .thaw        = lcs_thaw,
2407         .restore     = lcs_restore,
2408 };
2409 
2410 static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2411                                       const char *buf, size_t count)
2412 {
2413         int err;
2414         err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2415         return err ? err : count;
2416 }
2417 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2418 
2419 static struct attribute *lcs_drv_attrs[] = {
2420         &driver_attr_group.attr,
2421         NULL,
2422 };
2423 static struct attribute_group lcs_drv_attr_group = {
2424         .attrs = lcs_drv_attrs,
2425 };
2426 static const struct attribute_group *lcs_drv_attr_groups[] = {
2427         &lcs_drv_attr_group,
2428         NULL,
2429 };
2430 
2431 /**
2432  *  LCS Module/Kernel initialization function
2433  */
2434 static int
2435 __init lcs_init_module(void)
2436 {
2437         int rc;
2438 
2439         pr_info("Loading %s\n", version);
2440         rc = lcs_register_debug_facility();
2441         LCS_DBF_TEXT(0, setup, "lcsinit");
2442         if (rc)
2443                 goto out_err;
2444         lcs_root_dev = root_device_register("lcs");
2445         rc = PTR_RET(lcs_root_dev);
2446         if (rc)
2447                 goto register_err;
2448         rc = ccw_driver_register(&lcs_ccw_driver);
2449         if (rc)
2450                 goto ccw_err;
2451         lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2452         rc = ccwgroup_driver_register(&lcs_group_driver);
2453         if (rc)
2454                 goto ccwgroup_err;
2455         return 0;
2456 
2457 ccwgroup_err:
2458         ccw_driver_unregister(&lcs_ccw_driver);
2459 ccw_err:
2460         root_device_unregister(lcs_root_dev);
2461 register_err:
2462         lcs_unregister_debug_facility();
2463 out_err:
2464         pr_err("Initializing the lcs device driver failed\n");
2465         return rc;
2466 }
2467 
2468 
2469 /**
2470  *  LCS module cleanup function
2471  */
2472 static void
2473 __exit lcs_cleanup_module(void)
2474 {
2475         pr_info("Terminating lcs module.\n");
2476         LCS_DBF_TEXT(0, trace, "cleanup");
2477         ccwgroup_driver_unregister(&lcs_group_driver);
2478         ccw_driver_unregister(&lcs_ccw_driver);
2479         root_device_unregister(lcs_root_dev);
2480         lcs_unregister_debug_facility();
2481 }
2482 
2483 module_init(lcs_init_module);
2484 module_exit(lcs_cleanup_module);
2485 
2486 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2487 MODULE_LICENSE("GPL");
2488 
2489 

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