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x86/unwinder: Handle stack overflows more gracefully
[linux/fpc-iii.git] / drivers / s390 / net / lcs.c
blobd01b5c2a77600e4d21ce7f74bc00baf5fde29184
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 debug_unregister(lcs_dbf_setup);
92 debug_unregister(lcs_dbf_trace);
93 }
94
95 static int
96 lcs_register_debug_facility(void)
97 {
98 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
99 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
100 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
101 pr_err("Not enough memory for debug facility.\n");
102 lcs_unregister_debug_facility();
103 return -ENOMEM;
104 }
105 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
106 debug_set_level(lcs_dbf_setup, 2);
107 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
108 debug_set_level(lcs_dbf_trace, 2);
109 return 0;
110 }
111
112 /**
113 * Allocate io buffers.
114 */
115 static int
116 lcs_alloc_channel(struct lcs_channel *channel)
117 {
118 int cnt;
119
120 LCS_DBF_TEXT(2, setup, "ichalloc");
121 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
122 /* alloc memory fo iobuffer */
123 channel->iob[cnt].data =
124 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
125 if (channel->iob[cnt].data == NULL)
126 break;
127 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
128 }
129 if (cnt < LCS_NUM_BUFFS) {
130 /* Not all io buffers could be allocated. */
131 LCS_DBF_TEXT(2, setup, "echalloc");
132 while (cnt-- > 0)
133 kfree(channel->iob[cnt].data);
134 return -ENOMEM;
135 }
136 return 0;
137 }
138
139 /**
140 * Free io buffers.
141 */
142 static void
143 lcs_free_channel(struct lcs_channel *channel)
144 {
145 int cnt;
146
147 LCS_DBF_TEXT(2, setup, "ichfree");
148 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
149 kfree(channel->iob[cnt].data);
150 channel->iob[cnt].data = NULL;
151 }
152 }
153
154 /*
155 * Cleanup channel.
156 */
157 static void
158 lcs_cleanup_channel(struct lcs_channel *channel)
159 {
160 LCS_DBF_TEXT(3, setup, "cleanch");
161 /* Kill write channel tasklets. */
162 tasklet_kill(&channel->irq_tasklet);
163 /* Free channel buffers. */
164 lcs_free_channel(channel);
165 }
166
167 /**
168 * LCS free memory for card and channels.
169 */
170 static void
171 lcs_free_card(struct lcs_card *card)
172 {
173 LCS_DBF_TEXT(2, setup, "remcard");
174 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
175 kfree(card);
176 }
177
178 /**
179 * LCS alloc memory for card and channels
180 */
181 static struct lcs_card *
182 lcs_alloc_card(void)
183 {
184 struct lcs_card *card;
185 int rc;
186
187 LCS_DBF_TEXT(2, setup, "alloclcs");
188
189 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
190 if (card == NULL)
191 return NULL;
192 card->lan_type = LCS_FRAME_TYPE_AUTO;
193 card->pkt_seq = 0;
194 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
195 /* Allocate io buffers for the read channel. */
196 rc = lcs_alloc_channel(&card->read);
197 if (rc){
198 LCS_DBF_TEXT(2, setup, "iccwerr");
199 lcs_free_card(card);
200 return NULL;
201 }
202 /* Allocate io buffers for the write channel. */
203 rc = lcs_alloc_channel(&card->write);
204 if (rc) {
205 LCS_DBF_TEXT(2, setup, "iccwerr");
206 lcs_cleanup_channel(&card->read);
207 lcs_free_card(card);
208 return NULL;
209 }
210
211 #ifdef CONFIG_IP_MULTICAST
212 INIT_LIST_HEAD(&card->ipm_list);
213 #endif
214 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
215 return card;
216 }
217
218 /*
219 * Setup read channel.
220 */
221 static void
222 lcs_setup_read_ccws(struct lcs_card *card)
223 {
224 int cnt;
225
226 LCS_DBF_TEXT(2, setup, "ireadccw");
227 /* Setup read ccws. */
228 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
229 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
230 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
231 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
232 card->read.ccws[cnt].flags =
233 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
234 /*
235 * Note: we have allocated the buffer with GFP_DMA, so
236 * we do not need to do set_normalized_cda.
237 */
238 card->read.ccws[cnt].cda =
239 (__u32) __pa(card->read.iob[cnt].data);
240 ((struct lcs_header *)
241 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
242 card->read.iob[cnt].callback = lcs_get_frames_cb;
243 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
244 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
245 }
246 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
247 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
248 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
249 /* Last ccw is a tic (transfer in channel). */
250 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
251 card->read.ccws[LCS_NUM_BUFFS].cda =
252 (__u32) __pa(card->read.ccws);
253 /* Setg initial state of the read channel. */
254 card->read.state = LCS_CH_STATE_INIT;
255
256 card->read.io_idx = 0;
257 card->read.buf_idx = 0;
258 }
259
260 static void
261 lcs_setup_read(struct lcs_card *card)
262 {
263 LCS_DBF_TEXT(3, setup, "initread");
264
265 lcs_setup_read_ccws(card);
266 /* Initialize read channel tasklet. */
267 card->read.irq_tasklet.data = (unsigned long) &card->read;
268 card->read.irq_tasklet.func = lcs_tasklet;
269 /* Initialize waitqueue. */
270 init_waitqueue_head(&card->read.wait_q);
271 }
272
273 /*
274 * Setup write channel.
275 */
276 static void
277 lcs_setup_write_ccws(struct lcs_card *card)
278 {
279 int cnt;
280
281 LCS_DBF_TEXT(3, setup, "iwritccw");
282 /* Setup write ccws. */
283 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
284 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
285 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
286 card->write.ccws[cnt].count = 0;
287 card->write.ccws[cnt].flags =
288 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
289 /*
290 * Note: we have allocated the buffer with GFP_DMA, so
291 * we do not need to do set_normalized_cda.
292 */
293 card->write.ccws[cnt].cda =
294 (__u32) __pa(card->write.iob[cnt].data);
295 }
296 /* Last ccw is a tic (transfer in channel). */
297 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
298 card->write.ccws[LCS_NUM_BUFFS].cda =
299 (__u32) __pa(card->write.ccws);
300 /* Set initial state of the write channel. */
301 card->read.state = LCS_CH_STATE_INIT;
302
303 card->write.io_idx = 0;
304 card->write.buf_idx = 0;
305 }
306
307 static void
308 lcs_setup_write(struct lcs_card *card)
309 {
310 LCS_DBF_TEXT(3, setup, "initwrit");
311
312 lcs_setup_write_ccws(card);
313 /* Initialize write channel tasklet. */
314 card->write.irq_tasklet.data = (unsigned long) &card->write;
315 card->write.irq_tasklet.func = lcs_tasklet;
316 /* Initialize waitqueue. */
317 init_waitqueue_head(&card->write.wait_q);
318 }
319
320 static void
321 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
322 {
323 unsigned long flags;
324
325 spin_lock_irqsave(&card->mask_lock, flags);
326 card->thread_allowed_mask = threads;
327 spin_unlock_irqrestore(&card->mask_lock, flags);
328 wake_up(&card->wait_q);
329 }
330 static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
331 {
332 unsigned long flags;
333 int rc = 0;
334
335 spin_lock_irqsave(&card->mask_lock, flags);
336 rc = (card->thread_running_mask & threads);
337 spin_unlock_irqrestore(&card->mask_lock, flags);
338 return rc;
339 }
340
341 static int
342 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
343 {
344 return wait_event_interruptible(card->wait_q,
345 lcs_threads_running(card, threads) == 0);
346 }
347
348 static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
349 {
350 unsigned long flags;
351
352 spin_lock_irqsave(&card->mask_lock, flags);
353 if ( !(card->thread_allowed_mask & thread) ||
354 (card->thread_start_mask & thread) ) {
355 spin_unlock_irqrestore(&card->mask_lock, flags);
356 return -EPERM;
357 }
358 card->thread_start_mask |= thread;
359 spin_unlock_irqrestore(&card->mask_lock, flags);
360 return 0;
361 }
362
363 static void
364 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
365 {
366 unsigned long flags;
367
368 spin_lock_irqsave(&card->mask_lock, flags);
369 card->thread_running_mask &= ~thread;
370 spin_unlock_irqrestore(&card->mask_lock, flags);
371 wake_up(&card->wait_q);
372 }
373
374 static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
375 {
376 unsigned long flags;
377 int rc = 0;
378
379 spin_lock_irqsave(&card->mask_lock, flags);
380 if (card->thread_start_mask & thread){
381 if ((card->thread_allowed_mask & thread) &&
382 !(card->thread_running_mask & thread)){
383 rc = 1;
384 card->thread_start_mask &= ~thread;
385 card->thread_running_mask |= thread;
386 } else
387 rc = -EPERM;
388 }
389 spin_unlock_irqrestore(&card->mask_lock, flags);
390 return rc;
391 }
392
393 static int
394 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
395 {
396 int rc = 0;
397 wait_event(card->wait_q,
398 (rc = __lcs_do_run_thread(card, thread)) >= 0);
399 return rc;
400 }
401
402 static int
403 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
404 {
405 unsigned long flags;
406 int rc = 0;
407
408 spin_lock_irqsave(&card->mask_lock, flags);
409 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
410 (u8) card->thread_start_mask,
411 (u8) card->thread_allowed_mask,
412 (u8) card->thread_running_mask);
413 rc = (card->thread_start_mask & thread);
414 spin_unlock_irqrestore(&card->mask_lock, flags);
415 return rc;
416 }
417
418 /**
419 * Initialize channels,card and state machines.
420 */
421 static void
422 lcs_setup_card(struct lcs_card *card)
423 {
424 LCS_DBF_TEXT(2, setup, "initcard");
425 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
426
427 lcs_setup_read(card);
428 lcs_setup_write(card);
429 /* Set cards initial state. */
430 card->state = DEV_STATE_DOWN;
431 card->tx_buffer = NULL;
432 card->tx_emitted = 0;
433
434 init_waitqueue_head(&card->wait_q);
435 spin_lock_init(&card->lock);
436 spin_lock_init(&card->ipm_lock);
437 spin_lock_init(&card->mask_lock);
438 #ifdef CONFIG_IP_MULTICAST
439 INIT_LIST_HEAD(&card->ipm_list);
440 #endif
441 INIT_LIST_HEAD(&card->lancmd_waiters);
442 }
443
444 static void lcs_clear_multicast_list(struct lcs_card *card)
445 {
446 #ifdef CONFIG_IP_MULTICAST
447 struct lcs_ipm_list *ipm;
448 unsigned long flags;
449
450 /* Free multicast list. */
451 LCS_DBF_TEXT(3, setup, "clmclist");
452 spin_lock_irqsave(&card->ipm_lock, flags);
453 while (!list_empty(&card->ipm_list)){
454 ipm = list_entry(card->ipm_list.next,
455 struct lcs_ipm_list, list);
456 list_del(&ipm->list);
457 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
458 spin_unlock_irqrestore(&card->ipm_lock, flags);
459 lcs_send_delipm(card, ipm);
460 spin_lock_irqsave(&card->ipm_lock, flags);
461 }
462 kfree(ipm);
463 }
464 spin_unlock_irqrestore(&card->ipm_lock, flags);
465 #endif
466 }
467 /**
468 * Cleanup channels,card and state machines.
469 */
470 static void
471 lcs_cleanup_card(struct lcs_card *card)
472 {
473
474 LCS_DBF_TEXT(3, setup, "cleancrd");
475 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
476
477 if (card->dev != NULL)
478 free_netdev(card->dev);
479 /* Cleanup channels. */
480 lcs_cleanup_channel(&card->write);
481 lcs_cleanup_channel(&card->read);
482 }
483
484 /**
485 * Start channel.
486 */
487 static int
488 lcs_start_channel(struct lcs_channel *channel)
489 {
490 unsigned long flags;
491 int rc;
492
493 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
494 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
495 rc = ccw_device_start(channel->ccwdev,
496 channel->ccws + channel->io_idx, 0, 0,
497 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
498 if (rc == 0)
499 channel->state = LCS_CH_STATE_RUNNING;
500 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
501 if (rc) {
502 LCS_DBF_TEXT_(4,trace,"essh%s",
503 dev_name(&channel->ccwdev->dev));
504 dev_err(&channel->ccwdev->dev,
505 "Starting an LCS device resulted in an error,"
506 " rc=%d!\n", rc);
507 }
508 return rc;
509 }
510
511 static int
512 lcs_clear_channel(struct lcs_channel *channel)
513 {
514 unsigned long flags;
515 int rc;
516
517 LCS_DBF_TEXT(4,trace,"clearch");
518 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
519 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
520 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
521 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
522 if (rc) {
523 LCS_DBF_TEXT_(4, trace, "ecsc%s",
524 dev_name(&channel->ccwdev->dev));
525 return rc;
526 }
527 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
528 channel->state = LCS_CH_STATE_STOPPED;
529 return rc;
530 }
531
532
533 /**
534 * Stop channel.
535 */
536 static int
537 lcs_stop_channel(struct lcs_channel *channel)
538 {
539 unsigned long flags;
540 int rc;
541
542 if (channel->state == LCS_CH_STATE_STOPPED)
543 return 0;
544 LCS_DBF_TEXT(4,trace,"haltsch");
545 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
546 channel->state = LCS_CH_STATE_INIT;
547 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
548 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
549 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
550 if (rc) {
551 LCS_DBF_TEXT_(4, trace, "ehsc%s",
552 dev_name(&channel->ccwdev->dev));
553 return rc;
554 }
555 /* Asynchronous halt initialted. Wait for its completion. */
556 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
557 lcs_clear_channel(channel);
558 return 0;
559 }
560
561 /**
562 * start read and write channel
563 */
564 static int
565 lcs_start_channels(struct lcs_card *card)
566 {
567 int rc;
568
569 LCS_DBF_TEXT(2, trace, "chstart");
570 /* start read channel */
571 rc = lcs_start_channel(&card->read);
572 if (rc)
573 return rc;
574 /* start write channel */
575 rc = lcs_start_channel(&card->write);
576 if (rc)
577 lcs_stop_channel(&card->read);
578 return rc;
579 }
580
581 /**
582 * stop read and write channel
583 */
584 static int
585 lcs_stop_channels(struct lcs_card *card)
586 {
587 LCS_DBF_TEXT(2, trace, "chhalt");
588 lcs_stop_channel(&card->read);
589 lcs_stop_channel(&card->write);
590 return 0;
591 }
592
593 /**
594 * Get empty buffer.
595 */
596 static struct lcs_buffer *
597 __lcs_get_buffer(struct lcs_channel *channel)
598 {
599 int index;
600
601 LCS_DBF_TEXT(5, trace, "_getbuff");
602 index = channel->io_idx;
603 do {
604 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
605 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
606 return channel->iob + index;
607 }
608 index = (index + 1) & (LCS_NUM_BUFFS - 1);
609 } while (index != channel->io_idx);
610 return NULL;
611 }
612
613 static struct lcs_buffer *
614 lcs_get_buffer(struct lcs_channel *channel)
615 {
616 struct lcs_buffer *buffer;
617 unsigned long flags;
618
619 LCS_DBF_TEXT(5, trace, "getbuff");
620 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
621 buffer = __lcs_get_buffer(channel);
622 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
623 return buffer;
624 }
625
626 /**
627 * Resume channel program if the channel is suspended.
628 */
629 static int
630 __lcs_resume_channel(struct lcs_channel *channel)
631 {
632 int rc;
633
634 if (channel->state != LCS_CH_STATE_SUSPENDED)
635 return 0;
636 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
637 return 0;
638 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
639 rc = ccw_device_resume(channel->ccwdev);
640 if (rc) {
641 LCS_DBF_TEXT_(4, trace, "ersc%s",
642 dev_name(&channel->ccwdev->dev));
643 dev_err(&channel->ccwdev->dev,
644 "Sending data from the LCS device to the LAN failed"
645 " with rc=%d\n",rc);
646 } else
647 channel->state = LCS_CH_STATE_RUNNING;
648 return rc;
649
650 }
651
652 /**
653 * Make a buffer ready for processing.
654 */
655 static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
656 {
657 int prev, next;
658
659 LCS_DBF_TEXT(5, trace, "rdybits");
660 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
661 next = (index + 1) & (LCS_NUM_BUFFS - 1);
662 /* Check if we may clear the suspend bit of this buffer. */
663 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
664 /* Check if we have to set the PCI bit. */
665 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
666 /* Suspend bit of the previous buffer is not set. */
667 channel->ccws[index].flags |= CCW_FLAG_PCI;
668 /* Suspend bit of the next buffer is set. */
669 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
670 }
671 }
672
673 static int
674 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
675 {
676 unsigned long flags;
677 int index, rc;
678
679 LCS_DBF_TEXT(5, trace, "rdybuff");
680 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
681 buffer->state != LCS_BUF_STATE_PROCESSED);
682 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
683 buffer->state = LCS_BUF_STATE_READY;
684 index = buffer - channel->iob;
685 /* Set length. */
686 channel->ccws[index].count = buffer->count;
687 /* Check relevant PCI/suspend bits. */
688 __lcs_ready_buffer_bits(channel, index);
689 rc = __lcs_resume_channel(channel);
690 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
691 return rc;
692 }
693
694 /**
695 * Mark the buffer as processed. Take care of the suspend bit
696 * of the previous buffer. This function is called from
697 * interrupt context, so the lock must not be taken.
698 */
699 static int
700 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
701 {
702 int index, prev, next;
703
704 LCS_DBF_TEXT(5, trace, "prcsbuff");
705 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
706 buffer->state = LCS_BUF_STATE_PROCESSED;
707 index = buffer - channel->iob;
708 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
709 next = (index + 1) & (LCS_NUM_BUFFS - 1);
710 /* Set the suspend bit and clear the PCI bit of this buffer. */
711 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
712 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
713 /* Check the suspend bit of the previous buffer. */
714 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
715 /*
716 * Previous buffer is in state ready. It might have
717 * happened in lcs_ready_buffer that the suspend bit
718 * has not been cleared to avoid an endless loop.
719 * Do it now.
720 */
721 __lcs_ready_buffer_bits(channel, prev);
722 }
723 /* Clear PCI bit of next buffer. */
724 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
725 return __lcs_resume_channel(channel);
726 }
727
728 /**
729 * Put a processed buffer back to state empty.
730 */
731 static void
732 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
733 {
734 unsigned long flags;
735
736 LCS_DBF_TEXT(5, trace, "relbuff");
737 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
738 buffer->state != LCS_BUF_STATE_PROCESSED);
739 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
740 buffer->state = LCS_BUF_STATE_EMPTY;
741 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
742 }
743
744 /**
745 * Get buffer for a lan command.
746 */
747 static struct lcs_buffer *
748 lcs_get_lancmd(struct lcs_card *card, int count)
749 {
750 struct lcs_buffer *buffer;
751 struct lcs_cmd *cmd;
752
753 LCS_DBF_TEXT(4, trace, "getlncmd");
754 /* Get buffer and wait if none is available. */
755 wait_event(card->write.wait_q,
756 ((buffer = lcs_get_buffer(&card->write)) != NULL));
757 count += sizeof(struct lcs_header);
758 *(__u16 *)(buffer->data + count) = 0;
759 buffer->count = count + sizeof(__u16);
760 buffer->callback = lcs_release_buffer;
761 cmd = (struct lcs_cmd *) buffer->data;
762 cmd->offset = count;
763 cmd->type = LCS_FRAME_TYPE_CONTROL;
764 cmd->slot = 0;
765 return buffer;
766 }
767
768
769 static void
770 lcs_get_reply(struct lcs_reply *reply)
771 {
772 WARN_ON(atomic_read(&reply->refcnt) <= 0);
773 atomic_inc(&reply->refcnt);
774 }
775
776 static void
777 lcs_put_reply(struct lcs_reply *reply)
778 {
779 WARN_ON(atomic_read(&reply->refcnt) <= 0);
780 if (atomic_dec_and_test(&reply->refcnt)) {
781 kfree(reply);
782 }
783
784 }
785
786 static struct lcs_reply *
787 lcs_alloc_reply(struct lcs_cmd *cmd)
788 {
789 struct lcs_reply *reply;
790
791 LCS_DBF_TEXT(4, trace, "getreply");
792
793 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
794 if (!reply)
795 return NULL;
796 atomic_set(&reply->refcnt,1);
797 reply->sequence_no = cmd->sequence_no;
798 reply->received = 0;
799 reply->rc = 0;
800 init_waitqueue_head(&reply->wait_q);
801
802 return reply;
803 }
804
805 /**
806 * Notifier function for lancmd replies. Called from read irq.
807 */
808 static void
809 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
810 {
811 struct list_head *l, *n;
812 struct lcs_reply *reply;
813
814 LCS_DBF_TEXT(4, trace, "notiwait");
815 spin_lock(&card->lock);
816 list_for_each_safe(l, n, &card->lancmd_waiters) {
817 reply = list_entry(l, struct lcs_reply, list);
818 if (reply->sequence_no == cmd->sequence_no) {
819 lcs_get_reply(reply);
820 list_del_init(&reply->list);
821 if (reply->callback != NULL)
822 reply->callback(card, cmd);
823 reply->received = 1;
824 reply->rc = cmd->return_code;
825 wake_up(&reply->wait_q);
826 lcs_put_reply(reply);
827 break;
828 }
829 }
830 spin_unlock(&card->lock);
831 }
832
833 /**
834 * Emit buffer of a lan command.
835 */
836 static void
837 lcs_lancmd_timeout(unsigned long data)
838 {
839 struct lcs_reply *reply, *list_reply, *r;
840 unsigned long flags;
841
842 LCS_DBF_TEXT(4, trace, "timeout");
843 reply = (struct lcs_reply *) data;
844 spin_lock_irqsave(&reply->card->lock, flags);
845 list_for_each_entry_safe(list_reply, r,
846 &reply->card->lancmd_waiters,list) {
847 if (reply == list_reply) {
848 lcs_get_reply(reply);
849 list_del_init(&reply->list);
850 spin_unlock_irqrestore(&reply->card->lock, flags);
851 reply->received = 1;
852 reply->rc = -ETIME;
853 wake_up(&reply->wait_q);
854 lcs_put_reply(reply);
855 return;
856 }
857 }
858 spin_unlock_irqrestore(&reply->card->lock, flags);
859 }
860
861 static int
862 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
863 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
864 {
865 struct lcs_reply *reply;
866 struct lcs_cmd *cmd;
867 struct timer_list timer;
868 unsigned long flags;
869 int rc;
870
871 LCS_DBF_TEXT(4, trace, "sendcmd");
872 cmd = (struct lcs_cmd *) buffer->data;
873 cmd->return_code = 0;
874 cmd->sequence_no = card->sequence_no++;
875 reply = lcs_alloc_reply(cmd);
876 if (!reply)
877 return -ENOMEM;
878 reply->callback = reply_callback;
879 reply->card = card;
880 spin_lock_irqsave(&card->lock, flags);
881 list_add_tail(&reply->list, &card->lancmd_waiters);
882 spin_unlock_irqrestore(&card->lock, flags);
883
884 buffer->callback = lcs_release_buffer;
885 rc = lcs_ready_buffer(&card->write, buffer);
886 if (rc)
887 return rc;
888 init_timer_on_stack(&timer);
889 timer.function = lcs_lancmd_timeout;
890 timer.data = (unsigned long) reply;
891 timer.expires = jiffies + HZ*card->lancmd_timeout;
892 add_timer(&timer);
893 wait_event(reply->wait_q, reply->received);
894 del_timer_sync(&timer);
895 destroy_timer_on_stack(&timer);
896 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
897 rc = reply->rc;
898 lcs_put_reply(reply);
899 return rc ? -EIO : 0;
900 }
901
902 /**
903 * LCS startup command
904 */
905 static int
906 lcs_send_startup(struct lcs_card *card, __u8 initiator)
907 {
908 struct lcs_buffer *buffer;
909 struct lcs_cmd *cmd;
910
911 LCS_DBF_TEXT(2, trace, "startup");
912 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
913 cmd = (struct lcs_cmd *) buffer->data;
914 cmd->cmd_code = LCS_CMD_STARTUP;
915 cmd->initiator = initiator;
916 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
917 return lcs_send_lancmd(card, buffer, NULL);
918 }
919
920 /**
921 * LCS shutdown command
922 */
923 static int
924 lcs_send_shutdown(struct lcs_card *card)
925 {
926 struct lcs_buffer *buffer;
927 struct lcs_cmd *cmd;
928
929 LCS_DBF_TEXT(2, trace, "shutdown");
930 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
931 cmd = (struct lcs_cmd *) buffer->data;
932 cmd->cmd_code = LCS_CMD_SHUTDOWN;
933 cmd->initiator = LCS_INITIATOR_TCPIP;
934 return lcs_send_lancmd(card, buffer, NULL);
935 }
936
937 /**
938 * LCS lanstat command
939 */
940 static void
941 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
942 {
943 LCS_DBF_TEXT(2, trace, "statcb");
944 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
945 }
946
947 static int
948 lcs_send_lanstat(struct lcs_card *card)
949 {
950 struct lcs_buffer *buffer;
951 struct lcs_cmd *cmd;
952
953 LCS_DBF_TEXT(2,trace, "cmdstat");
954 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
955 cmd = (struct lcs_cmd *) buffer->data;
956 /* Setup lanstat command. */
957 cmd->cmd_code = LCS_CMD_LANSTAT;
958 cmd->initiator = LCS_INITIATOR_TCPIP;
959 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
960 cmd->cmd.lcs_std_cmd.portno = card->portno;
961 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
962 }
963
964 /**
965 * send stoplan command
966 */
967 static int
968 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
969 {
970 struct lcs_buffer *buffer;
971 struct lcs_cmd *cmd;
972
973 LCS_DBF_TEXT(2, trace, "cmdstpln");
974 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
975 cmd = (struct lcs_cmd *) buffer->data;
976 cmd->cmd_code = LCS_CMD_STOPLAN;
977 cmd->initiator = initiator;
978 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
979 cmd->cmd.lcs_std_cmd.portno = card->portno;
980 return lcs_send_lancmd(card, buffer, NULL);
981 }
982
983 /**
984 * send startlan command
985 */
986 static void
987 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
988 {
989 LCS_DBF_TEXT(2, trace, "srtlancb");
990 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
991 card->portno = cmd->cmd.lcs_std_cmd.portno;
992 }
993
994 static int
995 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
996 {
997 struct lcs_buffer *buffer;
998 struct lcs_cmd *cmd;
999
1000 LCS_DBF_TEXT(2, trace, "cmdstaln");
1001 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1002 cmd = (struct lcs_cmd *) buffer->data;
1003 cmd->cmd_code = LCS_CMD_STARTLAN;
1004 cmd->initiator = initiator;
1005 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1006 cmd->cmd.lcs_std_cmd.portno = card->portno;
1007 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1008 }
1009
1010 #ifdef CONFIG_IP_MULTICAST
1011 /**
1012 * send setipm command (Multicast)
1013 */
1014 static int
1015 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1016 {
1017 struct lcs_buffer *buffer;
1018 struct lcs_cmd *cmd;
1019
1020 LCS_DBF_TEXT(2, trace, "cmdsetim");
1021 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1022 cmd = (struct lcs_cmd *) buffer->data;
1023 cmd->cmd_code = LCS_CMD_SETIPM;
1024 cmd->initiator = LCS_INITIATOR_TCPIP;
1025 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1026 cmd->cmd.lcs_qipassist.portno = card->portno;
1027 cmd->cmd.lcs_qipassist.version = 4;
1028 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1029 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1030 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1031 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1032 return lcs_send_lancmd(card, buffer, NULL);
1033 }
1034
1035 /**
1036 * send delipm command (Multicast)
1037 */
1038 static int
1039 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1040 {
1041 struct lcs_buffer *buffer;
1042 struct lcs_cmd *cmd;
1043
1044 LCS_DBF_TEXT(2, trace, "cmddelim");
1045 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1046 cmd = (struct lcs_cmd *) buffer->data;
1047 cmd->cmd_code = LCS_CMD_DELIPM;
1048 cmd->initiator = LCS_INITIATOR_TCPIP;
1049 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1050 cmd->cmd.lcs_qipassist.portno = card->portno;
1051 cmd->cmd.lcs_qipassist.version = 4;
1052 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1053 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1054 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1055 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1056 return lcs_send_lancmd(card, buffer, NULL);
1057 }
1058
1059 /**
1060 * check if multicast is supported by LCS
1061 */
1062 static void
1063 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1064 {
1065 LCS_DBF_TEXT(2, trace, "chkmccb");
1066 card->ip_assists_supported =
1067 cmd->cmd.lcs_qipassist.ip_assists_supported;
1068 card->ip_assists_enabled =
1069 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1070 }
1071
1072 static int
1073 lcs_check_multicast_support(struct lcs_card *card)
1074 {
1075 struct lcs_buffer *buffer;
1076 struct lcs_cmd *cmd;
1077 int rc;
1078
1079 LCS_DBF_TEXT(2, trace, "cmdqipa");
1080 /* Send query ipassist. */
1081 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1082 cmd = (struct lcs_cmd *) buffer->data;
1083 cmd->cmd_code = LCS_CMD_QIPASSIST;
1084 cmd->initiator = LCS_INITIATOR_TCPIP;
1085 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1086 cmd->cmd.lcs_qipassist.portno = card->portno;
1087 cmd->cmd.lcs_qipassist.version = 4;
1088 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1089 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1090 if (rc != 0) {
1091 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1092 return -EOPNOTSUPP;
1093 }
1094 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1095 return 0;
1096 return -EOPNOTSUPP;
1097 }
1098
1099 /**
1100 * set or del multicast address on LCS card
1101 */
1102 static void
1103 lcs_fix_multicast_list(struct lcs_card *card)
1104 {
1105 struct list_head failed_list;
1106 struct lcs_ipm_list *ipm, *tmp;
1107 unsigned long flags;
1108 int rc;
1109
1110 LCS_DBF_TEXT(4,trace, "fixipm");
1111 INIT_LIST_HEAD(&failed_list);
1112 spin_lock_irqsave(&card->ipm_lock, flags);
1113 list_modified:
1114 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1115 switch (ipm->ipm_state) {
1116 case LCS_IPM_STATE_SET_REQUIRED:
1117 /* del from ipm_list so no one else can tamper with
1118 * this entry */
1119 list_del_init(&ipm->list);
1120 spin_unlock_irqrestore(&card->ipm_lock, flags);
1121 rc = lcs_send_setipm(card, ipm);
1122 spin_lock_irqsave(&card->ipm_lock, flags);
1123 if (rc) {
1124 pr_info("Adding multicast address failed."
1125 " Table possibly full!\n");
1126 /* store ipm in failed list -> will be added
1127 * to ipm_list again, so a retry will be done
1128 * during the next call of this function */
1129 list_add_tail(&ipm->list, &failed_list);
1130 } else {
1131 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1132 /* re-insert into ipm_list */
1133 list_add_tail(&ipm->list, &card->ipm_list);
1134 }
1135 goto list_modified;
1136 case LCS_IPM_STATE_DEL_REQUIRED:
1137 list_del(&ipm->list);
1138 spin_unlock_irqrestore(&card->ipm_lock, flags);
1139 lcs_send_delipm(card, ipm);
1140 spin_lock_irqsave(&card->ipm_lock, flags);
1141 kfree(ipm);
1142 goto list_modified;
1143 case LCS_IPM_STATE_ON_CARD:
1144 break;
1145 }
1146 }
1147 /* re-insert all entries from the failed_list into ipm_list */
1148 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1149 list_move_tail(&ipm->list, &card->ipm_list);
1150
1151 spin_unlock_irqrestore(&card->ipm_lock, flags);
1152 }
1153
1154 /**
1155 * get mac address for the relevant Multicast address
1156 */
1157 static void
1158 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1159 {
1160 LCS_DBF_TEXT(4,trace, "getmac");
1161 ip_eth_mc_map(ipm, mac);
1162 }
1163
1164 /**
1165 * function called by net device to handle multicast address relevant things
1166 */
1167 static void lcs_remove_mc_addresses(struct lcs_card *card,
1168 struct in_device *in4_dev)
1169 {
1170 struct ip_mc_list *im4;
1171 struct list_head *l;
1172 struct lcs_ipm_list *ipm;
1173 unsigned long flags;
1174 char buf[MAX_ADDR_LEN];
1175
1176 LCS_DBF_TEXT(4, trace, "remmclst");
1177 spin_lock_irqsave(&card->ipm_lock, flags);
1178 list_for_each(l, &card->ipm_list) {
1179 ipm = list_entry(l, struct lcs_ipm_list, list);
1180 for (im4 = rcu_dereference(in4_dev->mc_list);
1181 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1182 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1183 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1184 (memcmp(buf, &ipm->ipm.mac_addr,
1185 LCS_MAC_LENGTH) == 0) )
1186 break;
1187 }
1188 if (im4 == NULL)
1189 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1190 }
1191 spin_unlock_irqrestore(&card->ipm_lock, flags);
1192 }
1193
1194 static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
1195 struct ip_mc_list *im4,
1196 char *buf)
1197 {
1198 struct lcs_ipm_list *tmp, *ipm = NULL;
1199 struct list_head *l;
1200 unsigned long flags;
1201
1202 LCS_DBF_TEXT(4, trace, "chkmcent");
1203 spin_lock_irqsave(&card->ipm_lock, flags);
1204 list_for_each(l, &card->ipm_list) {
1205 tmp = list_entry(l, struct lcs_ipm_list, list);
1206 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1207 (memcmp(buf, &tmp->ipm.mac_addr,
1208 LCS_MAC_LENGTH) == 0) ) {
1209 ipm = tmp;
1210 break;
1211 }
1212 }
1213 spin_unlock_irqrestore(&card->ipm_lock, flags);
1214 return ipm;
1215 }
1216
1217 static void lcs_set_mc_addresses(struct lcs_card *card,
1218 struct in_device *in4_dev)
1219 {
1220
1221 struct ip_mc_list *im4;
1222 struct lcs_ipm_list *ipm;
1223 char buf[MAX_ADDR_LEN];
1224 unsigned long flags;
1225
1226 LCS_DBF_TEXT(4, trace, "setmclst");
1227 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1228 im4 = rcu_dereference(im4->next_rcu)) {
1229 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1230 ipm = lcs_check_addr_entry(card, im4, buf);
1231 if (ipm != NULL)
1232 continue; /* Address already in list. */
1233 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1234 if (ipm == NULL) {
1235 pr_info("Not enough memory to add"
1236 " new multicast entry!\n");
1237 break;
1238 }
1239 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1240 ipm->ipm.ip_addr = im4->multiaddr;
1241 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1242 spin_lock_irqsave(&card->ipm_lock, flags);
1243 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1244 list_add(&ipm->list, &card->ipm_list);
1245 spin_unlock_irqrestore(&card->ipm_lock, flags);
1246 }
1247 }
1248
1249 static int
1250 lcs_register_mc_addresses(void *data)
1251 {
1252 struct lcs_card *card;
1253 struct in_device *in4_dev;
1254
1255 card = (struct lcs_card *) data;
1256
1257 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1258 return 0;
1259 LCS_DBF_TEXT(4, trace, "regmulti");
1260
1261 in4_dev = in_dev_get(card->dev);
1262 if (in4_dev == NULL)
1263 goto out;
1264 rcu_read_lock();
1265 lcs_remove_mc_addresses(card,in4_dev);
1266 lcs_set_mc_addresses(card, in4_dev);
1267 rcu_read_unlock();
1268 in_dev_put(in4_dev);
1269
1270 netif_carrier_off(card->dev);
1271 netif_tx_disable(card->dev);
1272 wait_event(card->write.wait_q,
1273 (card->write.state != LCS_CH_STATE_RUNNING));
1274 lcs_fix_multicast_list(card);
1275 if (card->state == DEV_STATE_UP) {
1276 netif_carrier_on(card->dev);
1277 netif_wake_queue(card->dev);
1278 }
1279 out:
1280 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1281 return 0;
1282 }
1283 #endif /* CONFIG_IP_MULTICAST */
1284
1285 /**
1286 * function called by net device to
1287 * handle multicast address relevant things
1288 */
1289 static void
1290 lcs_set_multicast_list(struct net_device *dev)
1291 {
1292 #ifdef CONFIG_IP_MULTICAST
1293 struct lcs_card *card;
1294
1295 LCS_DBF_TEXT(4, trace, "setmulti");
1296 card = (struct lcs_card *) dev->ml_priv;
1297
1298 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1299 schedule_work(&card->kernel_thread_starter);
1300 #endif /* CONFIG_IP_MULTICAST */
1301 }
1302
1303 static long
1304 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1305 {
1306 if (!IS_ERR(irb))
1307 return 0;
1308
1309 switch (PTR_ERR(irb)) {
1310 case -EIO:
1311 dev_warn(&cdev->dev,
1312 "An I/O-error occurred on the LCS device\n");
1313 LCS_DBF_TEXT(2, trace, "ckirberr");
1314 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1315 break;
1316 case -ETIMEDOUT:
1317 dev_warn(&cdev->dev,
1318 "A command timed out on the LCS device\n");
1319 LCS_DBF_TEXT(2, trace, "ckirberr");
1320 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1321 break;
1322 default:
1323 dev_warn(&cdev->dev,
1324 "An error occurred on the LCS device, rc=%ld\n",
1325 PTR_ERR(irb));
1326 LCS_DBF_TEXT(2, trace, "ckirberr");
1327 LCS_DBF_TEXT(2, trace, " rc???");
1328 }
1329 return PTR_ERR(irb);
1330 }
1331
1332 static int
1333 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1334 {
1335 int dstat, cstat;
1336 char *sense;
1337
1338 sense = (char *) irb->ecw;
1339 cstat = irb->scsw.cmd.cstat;
1340 dstat = irb->scsw.cmd.dstat;
1341
1342 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1343 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1344 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1345 LCS_DBF_TEXT(2, trace, "CGENCHK");
1346 return 1;
1347 }
1348 if (dstat & DEV_STAT_UNIT_CHECK) {
1349 if (sense[LCS_SENSE_BYTE_1] &
1350 LCS_SENSE_RESETTING_EVENT) {
1351 LCS_DBF_TEXT(2, trace, "REVIND");
1352 return 1;
1353 }
1354 if (sense[LCS_SENSE_BYTE_0] &
1355 LCS_SENSE_CMD_REJECT) {
1356 LCS_DBF_TEXT(2, trace, "CMDREJ");
1357 return 0;
1358 }
1359 if ((!sense[LCS_SENSE_BYTE_0]) &&
1360 (!sense[LCS_SENSE_BYTE_1]) &&
1361 (!sense[LCS_SENSE_BYTE_2]) &&
1362 (!sense[LCS_SENSE_BYTE_3])) {
1363 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1364 return 0;
1365 }
1366 LCS_DBF_TEXT(2, trace, "DGENCHK");
1367 return 1;
1368 }
1369 return 0;
1370 }
1371
1372 static void
1373 lcs_schedule_recovery(struct lcs_card *card)
1374 {
1375 LCS_DBF_TEXT(2, trace, "startrec");
1376 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1377 schedule_work(&card->kernel_thread_starter);
1378 }
1379
1380 /**
1381 * IRQ Handler for LCS channels
1382 */
1383 static void
1384 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1385 {
1386 struct lcs_card *card;
1387 struct lcs_channel *channel;
1388 int rc, index;
1389 int cstat, dstat;
1390
1391 if (lcs_check_irb_error(cdev, irb))
1392 return;
1393
1394 card = CARD_FROM_DEV(cdev);
1395 if (card->read.ccwdev == cdev)
1396 channel = &card->read;
1397 else
1398 channel = &card->write;
1399
1400 cstat = irb->scsw.cmd.cstat;
1401 dstat = irb->scsw.cmd.dstat;
1402 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1403 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1404 irb->scsw.cmd.dstat);
1405 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1406 irb->scsw.cmd.actl);
1407
1408 /* Check for channel and device errors presented */
1409 rc = lcs_get_problem(cdev, irb);
1410 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1411 dev_warn(&cdev->dev,
1412 "The LCS device stopped because of an error,"
1413 " dstat=0x%X, cstat=0x%X \n",
1414 dstat, cstat);
1415 if (rc) {
1416 channel->state = LCS_CH_STATE_ERROR;
1417 }
1418 }
1419 if (channel->state == LCS_CH_STATE_ERROR) {
1420 lcs_schedule_recovery(card);
1421 wake_up(&card->wait_q);
1422 return;
1423 }
1424 /* How far in the ccw chain have we processed? */
1425 if ((channel->state != LCS_CH_STATE_INIT) &&
1426 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1427 (irb->scsw.cmd.cpa != 0)) {
1428 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1429 - channel->ccws;
1430 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1431 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1432 /* Bloody io subsystem tells us lies about cpa... */
1433 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1434 while (channel->io_idx != index) {
1435 __lcs_processed_buffer(channel,
1436 channel->iob + channel->io_idx);
1437 channel->io_idx =
1438 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1439 }
1440 }
1441
1442 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1443 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1444 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1445 /* Mark channel as stopped. */
1446 channel->state = LCS_CH_STATE_STOPPED;
1447 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1448 /* CCW execution stopped on a suspend bit. */
1449 channel->state = LCS_CH_STATE_SUSPENDED;
1450 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1451 if (irb->scsw.cmd.cc != 0) {
1452 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1453 return;
1454 }
1455 /* The channel has been stopped by halt_IO. */
1456 channel->state = LCS_CH_STATE_HALTED;
1457 }
1458 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1459 channel->state = LCS_CH_STATE_CLEARED;
1460 /* Do the rest in the tasklet. */
1461 tasklet_schedule(&channel->irq_tasklet);
1462 }
1463
1464 /**
1465 * Tasklet for IRQ handler
1466 */
1467 static void
1468 lcs_tasklet(unsigned long data)
1469 {
1470 unsigned long flags;
1471 struct lcs_channel *channel;
1472 struct lcs_buffer *iob;
1473 int buf_idx;
1474
1475 channel = (struct lcs_channel *) data;
1476 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1477
1478 /* Check for processed buffers. */
1479 iob = channel->iob;
1480 buf_idx = channel->buf_idx;
1481 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1482 /* Do the callback thing. */
1483 if (iob[buf_idx].callback != NULL)
1484 iob[buf_idx].callback(channel, iob + buf_idx);
1485 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1486 }
1487 channel->buf_idx = buf_idx;
1488
1489 if (channel->state == LCS_CH_STATE_STOPPED)
1490 lcs_start_channel(channel);
1491 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1492 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1493 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1494 __lcs_resume_channel(channel);
1495 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1496
1497 /* Something happened on the channel. Wake up waiters. */
1498 wake_up(&channel->wait_q);
1499 }
1500
1501 /**
1502 * Finish current tx buffer and make it ready for transmit.
1503 */
1504 static void
1505 __lcs_emit_txbuffer(struct lcs_card *card)
1506 {
1507 LCS_DBF_TEXT(5, trace, "emittx");
1508 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1509 card->tx_buffer->count += 2;
1510 lcs_ready_buffer(&card->write, card->tx_buffer);
1511 card->tx_buffer = NULL;
1512 card->tx_emitted++;
1513 }
1514
1515 /**
1516 * Callback for finished tx buffers.
1517 */
1518 static void
1519 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1520 {
1521 struct lcs_card *card;
1522
1523 LCS_DBF_TEXT(5, trace, "txbuffcb");
1524 /* Put buffer back to pool. */
1525 lcs_release_buffer(channel, buffer);
1526 card = container_of(channel, struct lcs_card, write);
1527 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1528 netif_wake_queue(card->dev);
1529 spin_lock(&card->lock);
1530 card->tx_emitted--;
1531 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1532 /*
1533 * Last running tx buffer has finished. Submit partially
1534 * filled current buffer.
1535 */
1536 __lcs_emit_txbuffer(card);
1537 spin_unlock(&card->lock);
1538 }
1539
1540 /**
1541 * Packet transmit function called by network stack
1542 */
1543 static int
1544 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1545 struct net_device *dev)
1546 {
1547 struct lcs_header *header;
1548 int rc = NETDEV_TX_OK;
1549
1550 LCS_DBF_TEXT(5, trace, "hardxmit");
1551 if (skb == NULL) {
1552 card->stats.tx_dropped++;
1553 card->stats.tx_errors++;
1554 return NETDEV_TX_OK;
1555 }
1556 if (card->state != DEV_STATE_UP) {
1557 dev_kfree_skb(skb);
1558 card->stats.tx_dropped++;
1559 card->stats.tx_errors++;
1560 card->stats.tx_carrier_errors++;
1561 return NETDEV_TX_OK;
1562 }
1563 if (skb->protocol == htons(ETH_P_IPV6)) {
1564 dev_kfree_skb(skb);
1565 return NETDEV_TX_OK;
1566 }
1567 netif_stop_queue(card->dev);
1568 spin_lock(&card->lock);
1569 if (card->tx_buffer != NULL &&
1570 card->tx_buffer->count + sizeof(struct lcs_header) +
1571 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1572 /* skb too big for current tx buffer. */
1573 __lcs_emit_txbuffer(card);
1574 if (card->tx_buffer == NULL) {
1575 /* Get new tx buffer */
1576 card->tx_buffer = lcs_get_buffer(&card->write);
1577 if (card->tx_buffer == NULL) {
1578 card->stats.tx_dropped++;
1579 rc = NETDEV_TX_BUSY;
1580 goto out;
1581 }
1582 card->tx_buffer->callback = lcs_txbuffer_cb;
1583 card->tx_buffer->count = 0;
1584 }
1585 header = (struct lcs_header *)
1586 (card->tx_buffer->data + card->tx_buffer->count);
1587 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1588 header->offset = card->tx_buffer->count;
1589 header->type = card->lan_type;
1590 header->slot = card->portno;
1591 skb_copy_from_linear_data(skb, header + 1, skb->len);
1592 spin_unlock(&card->lock);
1593 card->stats.tx_bytes += skb->len;
1594 card->stats.tx_packets++;
1595 dev_kfree_skb(skb);
1596 netif_wake_queue(card->dev);
1597 spin_lock(&card->lock);
1598 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1599 /* If this is the first tx buffer emit it immediately. */
1600 __lcs_emit_txbuffer(card);
1601 out:
1602 spin_unlock(&card->lock);
1603 return rc;
1604 }
1605
1606 static int
1607 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1608 {
1609 struct lcs_card *card;
1610 int rc;
1611
1612 LCS_DBF_TEXT(5, trace, "pktxmit");
1613 card = (struct lcs_card *) dev->ml_priv;
1614 rc = __lcs_start_xmit(card, skb, dev);
1615 return rc;
1616 }
1617
1618 /**
1619 * send startlan and lanstat command to make LCS device ready
1620 */
1621 static int
1622 lcs_startlan_auto(struct lcs_card *card)
1623 {
1624 int rc;
1625
1626 LCS_DBF_TEXT(2, trace, "strtauto");
1627 #ifdef CONFIG_ETHERNET
1628 card->lan_type = LCS_FRAME_TYPE_ENET;
1629 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1630 if (rc == 0)
1631 return 0;
1632
1633 #endif
1634 #ifdef CONFIG_FDDI
1635 card->lan_type = LCS_FRAME_TYPE_FDDI;
1636 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1637 if (rc == 0)
1638 return 0;
1639 #endif
1640 return -EIO;
1641 }
1642
1643 static int
1644 lcs_startlan(struct lcs_card *card)
1645 {
1646 int rc, i;
1647
1648 LCS_DBF_TEXT(2, trace, "startlan");
1649 rc = 0;
1650 if (card->portno != LCS_INVALID_PORT_NO) {
1651 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1652 rc = lcs_startlan_auto(card);
1653 else
1654 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1655 } else {
1656 for (i = 0; i <= 16; i++) {
1657 card->portno = i;
1658 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1659 rc = lcs_send_startlan(card,
1660 LCS_INITIATOR_TCPIP);
1661 else
1662 /* autodetecting lan type */
1663 rc = lcs_startlan_auto(card);
1664 if (rc == 0)
1665 break;
1666 }
1667 }
1668 if (rc == 0)
1669 return lcs_send_lanstat(card);
1670 return rc;
1671 }
1672
1673 /**
1674 * LCS detect function
1675 * setup channels and make them I/O ready
1676 */
1677 static int
1678 lcs_detect(struct lcs_card *card)
1679 {
1680 int rc = 0;
1681
1682 LCS_DBF_TEXT(2, setup, "lcsdetct");
1683 /* start/reset card */
1684 if (card->dev)
1685 netif_stop_queue(card->dev);
1686 rc = lcs_stop_channels(card);
1687 if (rc == 0) {
1688 rc = lcs_start_channels(card);
1689 if (rc == 0) {
1690 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1691 if (rc == 0)
1692 rc = lcs_startlan(card);
1693 }
1694 }
1695 if (rc == 0) {
1696 card->state = DEV_STATE_UP;
1697 } else {
1698 card->state = DEV_STATE_DOWN;
1699 card->write.state = LCS_CH_STATE_INIT;
1700 card->read.state = LCS_CH_STATE_INIT;
1701 }
1702 return rc;
1703 }
1704
1705 /**
1706 * LCS Stop card
1707 */
1708 static int
1709 lcs_stopcard(struct lcs_card *card)
1710 {
1711 int rc;
1712
1713 LCS_DBF_TEXT(3, setup, "stopcard");
1714
1715 if (card->read.state != LCS_CH_STATE_STOPPED &&
1716 card->write.state != LCS_CH_STATE_STOPPED &&
1717 card->read.state != LCS_CH_STATE_ERROR &&
1718 card->write.state != LCS_CH_STATE_ERROR &&
1719 card->state == DEV_STATE_UP) {
1720 lcs_clear_multicast_list(card);
1721 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1722 rc = lcs_send_shutdown(card);
1723 }
1724 rc = lcs_stop_channels(card);
1725 card->state = DEV_STATE_DOWN;
1726
1727 return rc;
1728 }
1729
1730 /**
1731 * Kernel Thread helper functions for LGW initiated commands
1732 */
1733 static void
1734 lcs_start_kernel_thread(struct work_struct *work)
1735 {
1736 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1737 LCS_DBF_TEXT(5, trace, "krnthrd");
1738 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1739 kthread_run(lcs_recovery, card, "lcs_recover");
1740 #ifdef CONFIG_IP_MULTICAST
1741 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1742 kthread_run(lcs_register_mc_addresses, card, "regipm");
1743 #endif
1744 }
1745
1746 /**
1747 * Process control frames.
1748 */
1749 static void
1750 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1751 {
1752 LCS_DBF_TEXT(5, trace, "getctrl");
1753 if (cmd->initiator == LCS_INITIATOR_LGW) {
1754 switch(cmd->cmd_code) {
1755 case LCS_CMD_STARTUP:
1756 case LCS_CMD_STARTLAN:
1757 lcs_schedule_recovery(card);
1758 break;
1759 case LCS_CMD_STOPLAN:
1760 pr_warn("Stoplan for %s initiated by LGW\n",
1761 card->dev->name);
1762 if (card->dev)
1763 netif_carrier_off(card->dev);
1764 break;
1765 default:
1766 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1767 break;
1768 }
1769 } else
1770 lcs_notify_lancmd_waiters(card, cmd);
1771 }
1772
1773 /**
1774 * Unpack network packet.
1775 */
1776 static void
1777 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1778 {
1779 struct sk_buff *skb;
1780
1781 LCS_DBF_TEXT(5, trace, "getskb");
1782 if (card->dev == NULL ||
1783 card->state != DEV_STATE_UP)
1784 /* The card isn't up. Ignore the packet. */
1785 return;
1786
1787 skb = dev_alloc_skb(skb_len);
1788 if (skb == NULL) {
1789 dev_err(&card->dev->dev,
1790 " Allocating a socket buffer to interface %s failed\n",
1791 card->dev->name);
1792 card->stats.rx_dropped++;
1793 return;
1794 }
1795 skb_put_data(skb, skb_data, skb_len);
1796 skb->protocol = card->lan_type_trans(skb, card->dev);
1797 card->stats.rx_bytes += skb_len;
1798 card->stats.rx_packets++;
1799 if (skb->protocol == htons(ETH_P_802_2))
1800 *((__u32 *)skb->cb) = ++card->pkt_seq;
1801 netif_rx(skb);
1802 }
1803
1804 /**
1805 * LCS main routine to get packets and lancmd replies from the buffers
1806 */
1807 static void
1808 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1809 {
1810 struct lcs_card *card;
1811 struct lcs_header *lcs_hdr;
1812 __u16 offset;
1813
1814 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1815 lcs_hdr = (struct lcs_header *) buffer->data;
1816 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1817 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1818 return;
1819 }
1820 card = container_of(channel, struct lcs_card, read);
1821 offset = 0;
1822 while (lcs_hdr->offset != 0) {
1823 if (lcs_hdr->offset <= 0 ||
1824 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1825 lcs_hdr->offset < offset) {
1826 /* Offset invalid. */
1827 card->stats.rx_length_errors++;
1828 card->stats.rx_errors++;
1829 return;
1830 }
1831 /* What kind of frame is it? */
1832 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1833 /* Control frame. */
1834 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1835 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1836 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1837 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1838 /* Normal network packet. */
1839 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1840 lcs_hdr->offset - offset -
1841 sizeof(struct lcs_header));
1842 else
1843 /* Unknown frame type. */
1844 ; // FIXME: error message ?
1845 /* Proceed to next frame. */
1846 offset = lcs_hdr->offset;
1847 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1848 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1849 }
1850 /* The buffer is now empty. Make it ready again. */
1851 lcs_ready_buffer(&card->read, buffer);
1852 }
1853
1854 /**
1855 * get network statistics for ifconfig and other user programs
1856 */
1857 static struct net_device_stats *
1858 lcs_getstats(struct net_device *dev)
1859 {
1860 struct lcs_card *card;
1861
1862 LCS_DBF_TEXT(4, trace, "netstats");
1863 card = (struct lcs_card *) dev->ml_priv;
1864 return &card->stats;
1865 }
1866
1867 /**
1868 * stop lcs device
1869 * This function will be called by user doing ifconfig xxx down
1870 */
1871 static int
1872 lcs_stop_device(struct net_device *dev)
1873 {
1874 struct lcs_card *card;
1875 int rc;
1876
1877 LCS_DBF_TEXT(2, trace, "stopdev");
1878 card = (struct lcs_card *) dev->ml_priv;
1879 netif_carrier_off(dev);
1880 netif_tx_disable(dev);
1881 dev->flags &= ~IFF_UP;
1882 wait_event(card->write.wait_q,
1883 (card->write.state != LCS_CH_STATE_RUNNING));
1884 rc = lcs_stopcard(card);
1885 if (rc)
1886 dev_err(&card->dev->dev,
1887 " Shutting down the LCS device failed\n");
1888 return rc;
1889 }
1890
1891 /**
1892 * start lcs device and make it runnable
1893 * This function will be called by user doing ifconfig xxx up
1894 */
1895 static int
1896 lcs_open_device(struct net_device *dev)
1897 {
1898 struct lcs_card *card;
1899 int rc;
1900
1901 LCS_DBF_TEXT(2, trace, "opendev");
1902 card = (struct lcs_card *) dev->ml_priv;
1903 /* initialize statistics */
1904 rc = lcs_detect(card);
1905 if (rc) {
1906 pr_err("Error in opening device!\n");
1907
1908 } else {
1909 dev->flags |= IFF_UP;
1910 netif_carrier_on(dev);
1911 netif_wake_queue(dev);
1912 card->state = DEV_STATE_UP;
1913 }
1914 return rc;
1915 }
1916
1917 /**
1918 * show function for portno called by cat or similar things
1919 */
1920 static ssize_t
1921 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1922 {
1923 struct lcs_card *card;
1924
1925 card = dev_get_drvdata(dev);
1926
1927 if (!card)
1928 return 0;
1929
1930 return sprintf(buf, "%d\n", card->portno);
1931 }
1932
1933 /**
1934 * store the value which is piped to file portno
1935 */
1936 static ssize_t
1937 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1938 {
1939 struct lcs_card *card;
1940 int rc;
1941 s16 value;
1942
1943 card = dev_get_drvdata(dev);
1944
1945 if (!card)
1946 return 0;
1947
1948 rc = kstrtos16(buf, 0, &value);
1949 if (rc)
1950 return -EINVAL;
1951 /* TODO: sanity checks */
1952 card->portno = value;
1953
1954 return count;
1955
1956 }
1957
1958 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1959
1960 static const char *lcs_type[] = {
1961 "not a channel",
1962 "2216 parallel",
1963 "2216 channel",
1964 "OSA LCS card",
1965 "unknown channel type",
1966 "unsupported channel type",
1967 };
1968
1969 static ssize_t
1970 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1971 {
1972 struct ccwgroup_device *cgdev;
1973
1974 cgdev = to_ccwgroupdev(dev);
1975 if (!cgdev)
1976 return -ENODEV;
1977
1978 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1979 }
1980
1981 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1982
1983 static ssize_t
1984 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1985 {
1986 struct lcs_card *card;
1987
1988 card = dev_get_drvdata(dev);
1989
1990 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1991 }
1992
1993 static ssize_t
1994 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1995 {
1996 struct lcs_card *card;
1997 unsigned int value;
1998 int rc;
1999
2000 card = dev_get_drvdata(dev);
2001
2002 if (!card)
2003 return 0;
2004
2005 rc = kstrtouint(buf, 0, &value);
2006 if (rc)
2007 return -EINVAL;
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(&ccwgdev->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 group_store(struct device_driver *ddrv, const char *buf,
2411 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_WO(group);
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_ERR_OR_ZERO(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
Linux with added FPC-III support