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OMAPDSS: VENC: fix NULL pointer dereference in DSS2 VENC sysfs debug attr on OMAP4
[zen-stable.git] / drivers / s390 / net / lcs.c
blob863fc2197155c36c0f956cd9d3bb7781d8b46778
1 /*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #define KMSG_COMPONENT "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/trdevice.h>
34 #include <linux/fddidevice.h>
35 #include <linux/inetdevice.h>
36 #include <linux/in.h>
37 #include <linux/igmp.h>
38 #include <linux/delay.h>
39 #include <linux/kthread.h>
40 #include <linux/slab.h>
41 #include <net/arp.h>
42 #include <net/ip.h>
43
44 #include <asm/debug.h>
45 #include <asm/idals.h>
46 #include <asm/timex.h>
47 #include <linux/device.h>
48 #include <asm/ccwgroup.h>
49
50 #include "lcs.h"
51
52
53 #if !defined(CONFIG_ETHERNET) && \
54 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
55 #error Cannot compile lcs.c without some net devices switched on.
56 #endif
57
58 /**
59 * initialization string for output
60 */
61
62 static char version[] __initdata = "LCS driver";
63
64 /**
65 * the root device for lcs group devices
66 */
67 static struct device *lcs_root_dev;
68
69 /**
70 * Some prototypes.
71 */
72 static void lcs_tasklet(unsigned long);
73 static void lcs_start_kernel_thread(struct work_struct *);
74 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
75 #ifdef CONFIG_IP_MULTICAST
76 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
77 #endif /* CONFIG_IP_MULTICAST */
78 static int lcs_recovery(void *ptr);
79
80 /**
81 * Debug Facility Stuff
82 */
83 static char debug_buffer[255];
84 static debug_info_t *lcs_dbf_setup;
85 static debug_info_t *lcs_dbf_trace;
86
87 /**
88 * LCS Debug Facility functions
89 */
90 static void
91 lcs_unregister_debug_facility(void)
92 {
93 if (lcs_dbf_setup)
94 debug_unregister(lcs_dbf_setup);
95 if (lcs_dbf_trace)
96 debug_unregister(lcs_dbf_trace);
97 }
98
99 static int
100 lcs_register_debug_facility(void)
101 {
102 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
103 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
104 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
105 pr_err("Not enough memory for debug facility.\n");
106 lcs_unregister_debug_facility();
107 return -ENOMEM;
108 }
109 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
110 debug_set_level(lcs_dbf_setup, 2);
111 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
112 debug_set_level(lcs_dbf_trace, 2);
113 return 0;
114 }
115
116 /**
117 * Allocate io buffers.
118 */
119 static int
120 lcs_alloc_channel(struct lcs_channel *channel)
121 {
122 int cnt;
123
124 LCS_DBF_TEXT(2, setup, "ichalloc");
125 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
126 /* alloc memory fo iobuffer */
127 channel->iob[cnt].data =
128 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
129 if (channel->iob[cnt].data == NULL)
130 break;
131 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
132 }
133 if (cnt < LCS_NUM_BUFFS) {
134 /* Not all io buffers could be allocated. */
135 LCS_DBF_TEXT(2, setup, "echalloc");
136 while (cnt-- > 0)
137 kfree(channel->iob[cnt].data);
138 return -ENOMEM;
139 }
140 return 0;
141 }
142
143 /**
144 * Free io buffers.
145 */
146 static void
147 lcs_free_channel(struct lcs_channel *channel)
148 {
149 int cnt;
150
151 LCS_DBF_TEXT(2, setup, "ichfree");
152 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
153 kfree(channel->iob[cnt].data);
154 channel->iob[cnt].data = NULL;
155 }
156 }
157
158 /*
159 * Cleanup channel.
160 */
161 static void
162 lcs_cleanup_channel(struct lcs_channel *channel)
163 {
164 LCS_DBF_TEXT(3, setup, "cleanch");
165 /* Kill write channel tasklets. */
166 tasklet_kill(&channel->irq_tasklet);
167 /* Free channel buffers. */
168 lcs_free_channel(channel);
169 }
170
171 /**
172 * LCS free memory for card and channels.
173 */
174 static void
175 lcs_free_card(struct lcs_card *card)
176 {
177 LCS_DBF_TEXT(2, setup, "remcard");
178 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
179 kfree(card);
180 }
181
182 /**
183 * LCS alloc memory for card and channels
184 */
185 static struct lcs_card *
186 lcs_alloc_card(void)
187 {
188 struct lcs_card *card;
189 int rc;
190
191 LCS_DBF_TEXT(2, setup, "alloclcs");
192
193 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
194 if (card == NULL)
195 return NULL;
196 card->lan_type = LCS_FRAME_TYPE_AUTO;
197 card->pkt_seq = 0;
198 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
199 /* Allocate io buffers for the read channel. */
200 rc = lcs_alloc_channel(&card->read);
201 if (rc){
202 LCS_DBF_TEXT(2, setup, "iccwerr");
203 lcs_free_card(card);
204 return NULL;
205 }
206 /* Allocate io buffers for the write channel. */
207 rc = lcs_alloc_channel(&card->write);
208 if (rc) {
209 LCS_DBF_TEXT(2, setup, "iccwerr");
210 lcs_cleanup_channel(&card->read);
211 lcs_free_card(card);
212 return NULL;
213 }
214
215 #ifdef CONFIG_IP_MULTICAST
216 INIT_LIST_HEAD(&card->ipm_list);
217 #endif
218 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
219 return card;
220 }
221
222 /*
223 * Setup read channel.
224 */
225 static void
226 lcs_setup_read_ccws(struct lcs_card *card)
227 {
228 int cnt;
229
230 LCS_DBF_TEXT(2, setup, "ireadccw");
231 /* Setup read ccws. */
232 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
233 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
234 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
235 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
236 card->read.ccws[cnt].flags =
237 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
238 /*
239 * Note: we have allocated the buffer with GFP_DMA, so
240 * we do not need to do set_normalized_cda.
241 */
242 card->read.ccws[cnt].cda =
243 (__u32) __pa(card->read.iob[cnt].data);
244 ((struct lcs_header *)
245 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
246 card->read.iob[cnt].callback = lcs_get_frames_cb;
247 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
248 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
249 }
250 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
251 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
252 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
253 /* Last ccw is a tic (transfer in channel). */
254 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
255 card->read.ccws[LCS_NUM_BUFFS].cda =
256 (__u32) __pa(card->read.ccws);
257 /* Setg initial state of the read channel. */
258 card->read.state = LCS_CH_STATE_INIT;
259
260 card->read.io_idx = 0;
261 card->read.buf_idx = 0;
262 }
263
264 static void
265 lcs_setup_read(struct lcs_card *card)
266 {
267 LCS_DBF_TEXT(3, setup, "initread");
268
269 lcs_setup_read_ccws(card);
270 /* Initialize read channel tasklet. */
271 card->read.irq_tasklet.data = (unsigned long) &card->read;
272 card->read.irq_tasklet.func = lcs_tasklet;
273 /* Initialize waitqueue. */
274 init_waitqueue_head(&card->read.wait_q);
275 }
276
277 /*
278 * Setup write channel.
279 */
280 static void
281 lcs_setup_write_ccws(struct lcs_card *card)
282 {
283 int cnt;
284
285 LCS_DBF_TEXT(3, setup, "iwritccw");
286 /* Setup write ccws. */
287 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
288 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
289 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
290 card->write.ccws[cnt].count = 0;
291 card->write.ccws[cnt].flags =
292 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
293 /*
294 * Note: we have allocated the buffer with GFP_DMA, so
295 * we do not need to do set_normalized_cda.
296 */
297 card->write.ccws[cnt].cda =
298 (__u32) __pa(card->write.iob[cnt].data);
299 }
300 /* Last ccw is a tic (transfer in channel). */
301 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
302 card->write.ccws[LCS_NUM_BUFFS].cda =
303 (__u32) __pa(card->write.ccws);
304 /* Set initial state of the write channel. */
305 card->read.state = LCS_CH_STATE_INIT;
306
307 card->write.io_idx = 0;
308 card->write.buf_idx = 0;
309 }
310
311 static void
312 lcs_setup_write(struct lcs_card *card)
313 {
314 LCS_DBF_TEXT(3, setup, "initwrit");
315
316 lcs_setup_write_ccws(card);
317 /* Initialize write channel tasklet. */
318 card->write.irq_tasklet.data = (unsigned long) &card->write;
319 card->write.irq_tasklet.func = lcs_tasklet;
320 /* Initialize waitqueue. */
321 init_waitqueue_head(&card->write.wait_q);
322 }
323
324 static void
325 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
326 {
327 unsigned long flags;
328
329 spin_lock_irqsave(&card->mask_lock, flags);
330 card->thread_allowed_mask = threads;
331 spin_unlock_irqrestore(&card->mask_lock, flags);
332 wake_up(&card->wait_q);
333 }
334 static inline int
335 lcs_threads_running(struct lcs_card *card, unsigned long threads)
336 {
337 unsigned long flags;
338 int rc = 0;
339
340 spin_lock_irqsave(&card->mask_lock, flags);
341 rc = (card->thread_running_mask & threads);
342 spin_unlock_irqrestore(&card->mask_lock, flags);
343 return rc;
344 }
345
346 static int
347 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
348 {
349 return wait_event_interruptible(card->wait_q,
350 lcs_threads_running(card, threads) == 0);
351 }
352
353 static inline int
354 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
355 {
356 unsigned long flags;
357
358 spin_lock_irqsave(&card->mask_lock, flags);
359 if ( !(card->thread_allowed_mask & thread) ||
360 (card->thread_start_mask & thread) ) {
361 spin_unlock_irqrestore(&card->mask_lock, flags);
362 return -EPERM;
363 }
364 card->thread_start_mask |= thread;
365 spin_unlock_irqrestore(&card->mask_lock, flags);
366 return 0;
367 }
368
369 static void
370 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
371 {
372 unsigned long flags;
373
374 spin_lock_irqsave(&card->mask_lock, flags);
375 card->thread_running_mask &= ~thread;
376 spin_unlock_irqrestore(&card->mask_lock, flags);
377 wake_up(&card->wait_q);
378 }
379
380 static inline int
381 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
382 {
383 unsigned long flags;
384 int rc = 0;
385
386 spin_lock_irqsave(&card->mask_lock, flags);
387 if (card->thread_start_mask & thread){
388 if ((card->thread_allowed_mask & thread) &&
389 !(card->thread_running_mask & thread)){
390 rc = 1;
391 card->thread_start_mask &= ~thread;
392 card->thread_running_mask |= thread;
393 } else
394 rc = -EPERM;
395 }
396 spin_unlock_irqrestore(&card->mask_lock, flags);
397 return rc;
398 }
399
400 static int
401 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
402 {
403 int rc = 0;
404 wait_event(card->wait_q,
405 (rc = __lcs_do_run_thread(card, thread)) >= 0);
406 return rc;
407 }
408
409 static int
410 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
411 {
412 unsigned long flags;
413 int rc = 0;
414
415 spin_lock_irqsave(&card->mask_lock, flags);
416 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
417 (u8) card->thread_start_mask,
418 (u8) card->thread_allowed_mask,
419 (u8) card->thread_running_mask);
420 rc = (card->thread_start_mask & thread);
421 spin_unlock_irqrestore(&card->mask_lock, flags);
422 return rc;
423 }
424
425 /**
426 * Initialize channels,card and state machines.
427 */
428 static void
429 lcs_setup_card(struct lcs_card *card)
430 {
431 LCS_DBF_TEXT(2, setup, "initcard");
432 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
433
434 lcs_setup_read(card);
435 lcs_setup_write(card);
436 /* Set cards initial state. */
437 card->state = DEV_STATE_DOWN;
438 card->tx_buffer = NULL;
439 card->tx_emitted = 0;
440
441 init_waitqueue_head(&card->wait_q);
442 spin_lock_init(&card->lock);
443 spin_lock_init(&card->ipm_lock);
444 spin_lock_init(&card->mask_lock);
445 #ifdef CONFIG_IP_MULTICAST
446 INIT_LIST_HEAD(&card->ipm_list);
447 #endif
448 INIT_LIST_HEAD(&card->lancmd_waiters);
449 }
450
451 static inline void
452 lcs_clear_multicast_list(struct lcs_card *card)
453 {
454 #ifdef CONFIG_IP_MULTICAST
455 struct lcs_ipm_list *ipm;
456 unsigned long flags;
457
458 /* Free multicast list. */
459 LCS_DBF_TEXT(3, setup, "clmclist");
460 spin_lock_irqsave(&card->ipm_lock, flags);
461 while (!list_empty(&card->ipm_list)){
462 ipm = list_entry(card->ipm_list.next,
463 struct lcs_ipm_list, list);
464 list_del(&ipm->list);
465 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
466 spin_unlock_irqrestore(&card->ipm_lock, flags);
467 lcs_send_delipm(card, ipm);
468 spin_lock_irqsave(&card->ipm_lock, flags);
469 }
470 kfree(ipm);
471 }
472 spin_unlock_irqrestore(&card->ipm_lock, flags);
473 #endif
474 }
475 /**
476 * Cleanup channels,card and state machines.
477 */
478 static void
479 lcs_cleanup_card(struct lcs_card *card)
480 {
481
482 LCS_DBF_TEXT(3, setup, "cleancrd");
483 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
484
485 if (card->dev != NULL)
486 free_netdev(card->dev);
487 /* Cleanup channels. */
488 lcs_cleanup_channel(&card->write);
489 lcs_cleanup_channel(&card->read);
490 }
491
492 /**
493 * Start channel.
494 */
495 static int
496 lcs_start_channel(struct lcs_channel *channel)
497 {
498 unsigned long flags;
499 int rc;
500
501 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
502 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
503 rc = ccw_device_start(channel->ccwdev,
504 channel->ccws + channel->io_idx, 0, 0,
505 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
506 if (rc == 0)
507 channel->state = LCS_CH_STATE_RUNNING;
508 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
509 if (rc) {
510 LCS_DBF_TEXT_(4,trace,"essh%s",
511 dev_name(&channel->ccwdev->dev));
512 dev_err(&channel->ccwdev->dev,
513 "Starting an LCS device resulted in an error,"
514 " rc=%d!\n", rc);
515 }
516 return rc;
517 }
518
519 static int
520 lcs_clear_channel(struct lcs_channel *channel)
521 {
522 unsigned long flags;
523 int rc;
524
525 LCS_DBF_TEXT(4,trace,"clearch");
526 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
527 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
528 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
529 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
530 if (rc) {
531 LCS_DBF_TEXT_(4, trace, "ecsc%s",
532 dev_name(&channel->ccwdev->dev));
533 return rc;
534 }
535 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
536 channel->state = LCS_CH_STATE_STOPPED;
537 return rc;
538 }
539
540
541 /**
542 * Stop channel.
543 */
544 static int
545 lcs_stop_channel(struct lcs_channel *channel)
546 {
547 unsigned long flags;
548 int rc;
549
550 if (channel->state == LCS_CH_STATE_STOPPED)
551 return 0;
552 LCS_DBF_TEXT(4,trace,"haltsch");
553 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
554 channel->state = LCS_CH_STATE_INIT;
555 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
556 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
557 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
558 if (rc) {
559 LCS_DBF_TEXT_(4, trace, "ehsc%s",
560 dev_name(&channel->ccwdev->dev));
561 return rc;
562 }
563 /* Asynchronous halt initialted. Wait for its completion. */
564 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
565 lcs_clear_channel(channel);
566 return 0;
567 }
568
569 /**
570 * start read and write channel
571 */
572 static int
573 lcs_start_channels(struct lcs_card *card)
574 {
575 int rc;
576
577 LCS_DBF_TEXT(2, trace, "chstart");
578 /* start read channel */
579 rc = lcs_start_channel(&card->read);
580 if (rc)
581 return rc;
582 /* start write channel */
583 rc = lcs_start_channel(&card->write);
584 if (rc)
585 lcs_stop_channel(&card->read);
586 return rc;
587 }
588
589 /**
590 * stop read and write channel
591 */
592 static int
593 lcs_stop_channels(struct lcs_card *card)
594 {
595 LCS_DBF_TEXT(2, trace, "chhalt");
596 lcs_stop_channel(&card->read);
597 lcs_stop_channel(&card->write);
598 return 0;
599 }
600
601 /**
602 * Get empty buffer.
603 */
604 static struct lcs_buffer *
605 __lcs_get_buffer(struct lcs_channel *channel)
606 {
607 int index;
608
609 LCS_DBF_TEXT(5, trace, "_getbuff");
610 index = channel->io_idx;
611 do {
612 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
613 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
614 return channel->iob + index;
615 }
616 index = (index + 1) & (LCS_NUM_BUFFS - 1);
617 } while (index != channel->io_idx);
618 return NULL;
619 }
620
621 static struct lcs_buffer *
622 lcs_get_buffer(struct lcs_channel *channel)
623 {
624 struct lcs_buffer *buffer;
625 unsigned long flags;
626
627 LCS_DBF_TEXT(5, trace, "getbuff");
628 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
629 buffer = __lcs_get_buffer(channel);
630 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
631 return buffer;
632 }
633
634 /**
635 * Resume channel program if the channel is suspended.
636 */
637 static int
638 __lcs_resume_channel(struct lcs_channel *channel)
639 {
640 int rc;
641
642 if (channel->state != LCS_CH_STATE_SUSPENDED)
643 return 0;
644 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
645 return 0;
646 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
647 rc = ccw_device_resume(channel->ccwdev);
648 if (rc) {
649 LCS_DBF_TEXT_(4, trace, "ersc%s",
650 dev_name(&channel->ccwdev->dev));
651 dev_err(&channel->ccwdev->dev,
652 "Sending data from the LCS device to the LAN failed"
653 " with rc=%d\n",rc);
654 } else
655 channel->state = LCS_CH_STATE_RUNNING;
656 return rc;
657
658 }
659
660 /**
661 * Make a buffer ready for processing.
662 */
663 static inline void
664 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
665 {
666 int prev, next;
667
668 LCS_DBF_TEXT(5, trace, "rdybits");
669 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
670 next = (index + 1) & (LCS_NUM_BUFFS - 1);
671 /* Check if we may clear the suspend bit of this buffer. */
672 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
673 /* Check if we have to set the PCI bit. */
674 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
675 /* Suspend bit of the previous buffer is not set. */
676 channel->ccws[index].flags |= CCW_FLAG_PCI;
677 /* Suspend bit of the next buffer is set. */
678 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
679 }
680 }
681
682 static int
683 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
684 {
685 unsigned long flags;
686 int index, rc;
687
688 LCS_DBF_TEXT(5, trace, "rdybuff");
689 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
690 buffer->state != LCS_BUF_STATE_PROCESSED);
691 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
692 buffer->state = LCS_BUF_STATE_READY;
693 index = buffer - channel->iob;
694 /* Set length. */
695 channel->ccws[index].count = buffer->count;
696 /* Check relevant PCI/suspend bits. */
697 __lcs_ready_buffer_bits(channel, index);
698 rc = __lcs_resume_channel(channel);
699 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
700 return rc;
701 }
702
703 /**
704 * Mark the buffer as processed. Take care of the suspend bit
705 * of the previous buffer. This function is called from
706 * interrupt context, so the lock must not be taken.
707 */
708 static int
709 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
710 {
711 int index, prev, next;
712
713 LCS_DBF_TEXT(5, trace, "prcsbuff");
714 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
715 buffer->state = LCS_BUF_STATE_PROCESSED;
716 index = buffer - channel->iob;
717 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
718 next = (index + 1) & (LCS_NUM_BUFFS - 1);
719 /* Set the suspend bit and clear the PCI bit of this buffer. */
720 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
721 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
722 /* Check the suspend bit of the previous buffer. */
723 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
724 /*
725 * Previous buffer is in state ready. It might have
726 * happened in lcs_ready_buffer that the suspend bit
727 * has not been cleared to avoid an endless loop.
728 * Do it now.
729 */
730 __lcs_ready_buffer_bits(channel, prev);
731 }
732 /* Clear PCI bit of next buffer. */
733 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
734 return __lcs_resume_channel(channel);
735 }
736
737 /**
738 * Put a processed buffer back to state empty.
739 */
740 static void
741 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
742 {
743 unsigned long flags;
744
745 LCS_DBF_TEXT(5, trace, "relbuff");
746 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
747 buffer->state != LCS_BUF_STATE_PROCESSED);
748 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
749 buffer->state = LCS_BUF_STATE_EMPTY;
750 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
751 }
752
753 /**
754 * Get buffer for a lan command.
755 */
756 static struct lcs_buffer *
757 lcs_get_lancmd(struct lcs_card *card, int count)
758 {
759 struct lcs_buffer *buffer;
760 struct lcs_cmd *cmd;
761
762 LCS_DBF_TEXT(4, trace, "getlncmd");
763 /* Get buffer and wait if none is available. */
764 wait_event(card->write.wait_q,
765 ((buffer = lcs_get_buffer(&card->write)) != NULL));
766 count += sizeof(struct lcs_header);
767 *(__u16 *)(buffer->data + count) = 0;
768 buffer->count = count + sizeof(__u16);
769 buffer->callback = lcs_release_buffer;
770 cmd = (struct lcs_cmd *) buffer->data;
771 cmd->offset = count;
772 cmd->type = LCS_FRAME_TYPE_CONTROL;
773 cmd->slot = 0;
774 return buffer;
775 }
776
777
778 static void
779 lcs_get_reply(struct lcs_reply *reply)
780 {
781 WARN_ON(atomic_read(&reply->refcnt) <= 0);
782 atomic_inc(&reply->refcnt);
783 }
784
785 static void
786 lcs_put_reply(struct lcs_reply *reply)
787 {
788 WARN_ON(atomic_read(&reply->refcnt) <= 0);
789 if (atomic_dec_and_test(&reply->refcnt)) {
790 kfree(reply);
791 }
792
793 }
794
795 static struct lcs_reply *
796 lcs_alloc_reply(struct lcs_cmd *cmd)
797 {
798 struct lcs_reply *reply;
799
800 LCS_DBF_TEXT(4, trace, "getreply");
801
802 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
803 if (!reply)
804 return NULL;
805 atomic_set(&reply->refcnt,1);
806 reply->sequence_no = cmd->sequence_no;
807 reply->received = 0;
808 reply->rc = 0;
809 init_waitqueue_head(&reply->wait_q);
810
811 return reply;
812 }
813
814 /**
815 * Notifier function for lancmd replies. Called from read irq.
816 */
817 static void
818 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
819 {
820 struct list_head *l, *n;
821 struct lcs_reply *reply;
822
823 LCS_DBF_TEXT(4, trace, "notiwait");
824 spin_lock(&card->lock);
825 list_for_each_safe(l, n, &card->lancmd_waiters) {
826 reply = list_entry(l, struct lcs_reply, list);
827 if (reply->sequence_no == cmd->sequence_no) {
828 lcs_get_reply(reply);
829 list_del_init(&reply->list);
830 if (reply->callback != NULL)
831 reply->callback(card, cmd);
832 reply->received = 1;
833 reply->rc = cmd->return_code;
834 wake_up(&reply->wait_q);
835 lcs_put_reply(reply);
836 break;
837 }
838 }
839 spin_unlock(&card->lock);
840 }
841
842 /**
843 * Emit buffer of a lan command.
844 */
845 static void
846 lcs_lancmd_timeout(unsigned long data)
847 {
848 struct lcs_reply *reply, *list_reply, *r;
849 unsigned long flags;
850
851 LCS_DBF_TEXT(4, trace, "timeout");
852 reply = (struct lcs_reply *) data;
853 spin_lock_irqsave(&reply->card->lock, flags);
854 list_for_each_entry_safe(list_reply, r,
855 &reply->card->lancmd_waiters,list) {
856 if (reply == list_reply) {
857 lcs_get_reply(reply);
858 list_del_init(&reply->list);
859 spin_unlock_irqrestore(&reply->card->lock, flags);
860 reply->received = 1;
861 reply->rc = -ETIME;
862 wake_up(&reply->wait_q);
863 lcs_put_reply(reply);
864 return;
865 }
866 }
867 spin_unlock_irqrestore(&reply->card->lock, flags);
868 }
869
870 static int
871 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
872 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
873 {
874 struct lcs_reply *reply;
875 struct lcs_cmd *cmd;
876 struct timer_list timer;
877 unsigned long flags;
878 int rc;
879
880 LCS_DBF_TEXT(4, trace, "sendcmd");
881 cmd = (struct lcs_cmd *) buffer->data;
882 cmd->return_code = 0;
883 cmd->sequence_no = card->sequence_no++;
884 reply = lcs_alloc_reply(cmd);
885 if (!reply)
886 return -ENOMEM;
887 reply->callback = reply_callback;
888 reply->card = card;
889 spin_lock_irqsave(&card->lock, flags);
890 list_add_tail(&reply->list, &card->lancmd_waiters);
891 spin_unlock_irqrestore(&card->lock, flags);
892
893 buffer->callback = lcs_release_buffer;
894 rc = lcs_ready_buffer(&card->write, buffer);
895 if (rc)
896 return rc;
897 init_timer_on_stack(&timer);
898 timer.function = lcs_lancmd_timeout;
899 timer.data = (unsigned long) reply;
900 timer.expires = jiffies + HZ*card->lancmd_timeout;
901 add_timer(&timer);
902 wait_event(reply->wait_q, reply->received);
903 del_timer_sync(&timer);
904 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
905 rc = reply->rc;
906 lcs_put_reply(reply);
907 return rc ? -EIO : 0;
908 }
909
910 /**
911 * LCS startup command
912 */
913 static int
914 lcs_send_startup(struct lcs_card *card, __u8 initiator)
915 {
916 struct lcs_buffer *buffer;
917 struct lcs_cmd *cmd;
918
919 LCS_DBF_TEXT(2, trace, "startup");
920 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
921 cmd = (struct lcs_cmd *) buffer->data;
922 cmd->cmd_code = LCS_CMD_STARTUP;
923 cmd->initiator = initiator;
924 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
925 return lcs_send_lancmd(card, buffer, NULL);
926 }
927
928 /**
929 * LCS shutdown command
930 */
931 static int
932 lcs_send_shutdown(struct lcs_card *card)
933 {
934 struct lcs_buffer *buffer;
935 struct lcs_cmd *cmd;
936
937 LCS_DBF_TEXT(2, trace, "shutdown");
938 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
939 cmd = (struct lcs_cmd *) buffer->data;
940 cmd->cmd_code = LCS_CMD_SHUTDOWN;
941 cmd->initiator = LCS_INITIATOR_TCPIP;
942 return lcs_send_lancmd(card, buffer, NULL);
943 }
944
945 /**
946 * LCS lanstat command
947 */
948 static void
949 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
950 {
951 LCS_DBF_TEXT(2, trace, "statcb");
952 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
953 }
954
955 static int
956 lcs_send_lanstat(struct lcs_card *card)
957 {
958 struct lcs_buffer *buffer;
959 struct lcs_cmd *cmd;
960
961 LCS_DBF_TEXT(2,trace, "cmdstat");
962 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
963 cmd = (struct lcs_cmd *) buffer->data;
964 /* Setup lanstat command. */
965 cmd->cmd_code = LCS_CMD_LANSTAT;
966 cmd->initiator = LCS_INITIATOR_TCPIP;
967 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
968 cmd->cmd.lcs_std_cmd.portno = card->portno;
969 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
970 }
971
972 /**
973 * send stoplan command
974 */
975 static int
976 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
977 {
978 struct lcs_buffer *buffer;
979 struct lcs_cmd *cmd;
980
981 LCS_DBF_TEXT(2, trace, "cmdstpln");
982 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
983 cmd = (struct lcs_cmd *) buffer->data;
984 cmd->cmd_code = LCS_CMD_STOPLAN;
985 cmd->initiator = initiator;
986 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
987 cmd->cmd.lcs_std_cmd.portno = card->portno;
988 return lcs_send_lancmd(card, buffer, NULL);
989 }
990
991 /**
992 * send startlan command
993 */
994 static void
995 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
996 {
997 LCS_DBF_TEXT(2, trace, "srtlancb");
998 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
999 card->portno = cmd->cmd.lcs_std_cmd.portno;
1000 }
1001
1002 static int
1003 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1004 {
1005 struct lcs_buffer *buffer;
1006 struct lcs_cmd *cmd;
1007
1008 LCS_DBF_TEXT(2, trace, "cmdstaln");
1009 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1010 cmd = (struct lcs_cmd *) buffer->data;
1011 cmd->cmd_code = LCS_CMD_STARTLAN;
1012 cmd->initiator = initiator;
1013 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1014 cmd->cmd.lcs_std_cmd.portno = card->portno;
1015 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /**
1020 * send setipm command (Multicast)
1021 */
1022 static int
1023 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1024 {
1025 struct lcs_buffer *buffer;
1026 struct lcs_cmd *cmd;
1027
1028 LCS_DBF_TEXT(2, trace, "cmdsetim");
1029 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1030 cmd = (struct lcs_cmd *) buffer->data;
1031 cmd->cmd_code = LCS_CMD_SETIPM;
1032 cmd->initiator = LCS_INITIATOR_TCPIP;
1033 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1034 cmd->cmd.lcs_qipassist.portno = card->portno;
1035 cmd->cmd.lcs_qipassist.version = 4;
1036 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1037 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1038 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1039 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1040 return lcs_send_lancmd(card, buffer, NULL);
1041 }
1042
1043 /**
1044 * send delipm command (Multicast)
1045 */
1046 static int
1047 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1048 {
1049 struct lcs_buffer *buffer;
1050 struct lcs_cmd *cmd;
1051
1052 LCS_DBF_TEXT(2, trace, "cmddelim");
1053 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1054 cmd = (struct lcs_cmd *) buffer->data;
1055 cmd->cmd_code = LCS_CMD_DELIPM;
1056 cmd->initiator = LCS_INITIATOR_TCPIP;
1057 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058 cmd->cmd.lcs_qipassist.portno = card->portno;
1059 cmd->cmd.lcs_qipassist.version = 4;
1060 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1062 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1063 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1064 return lcs_send_lancmd(card, buffer, NULL);
1065 }
1066
1067 /**
1068 * check if multicast is supported by LCS
1069 */
1070 static void
1071 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1072 {
1073 LCS_DBF_TEXT(2, trace, "chkmccb");
1074 card->ip_assists_supported =
1075 cmd->cmd.lcs_qipassist.ip_assists_supported;
1076 card->ip_assists_enabled =
1077 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1078 }
1079
1080 static int
1081 lcs_check_multicast_support(struct lcs_card *card)
1082 {
1083 struct lcs_buffer *buffer;
1084 struct lcs_cmd *cmd;
1085 int rc;
1086
1087 LCS_DBF_TEXT(2, trace, "cmdqipa");
1088 /* Send query ipassist. */
1089 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1090 cmd = (struct lcs_cmd *) buffer->data;
1091 cmd->cmd_code = LCS_CMD_QIPASSIST;
1092 cmd->initiator = LCS_INITIATOR_TCPIP;
1093 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1094 cmd->cmd.lcs_qipassist.portno = card->portno;
1095 cmd->cmd.lcs_qipassist.version = 4;
1096 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1097 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1098 if (rc != 0) {
1099 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1100 return -EOPNOTSUPP;
1101 }
1102 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1103 return 0;
1104 return -EOPNOTSUPP;
1105 }
1106
1107 /**
1108 * set or del multicast address on LCS card
1109 */
1110 static void
1111 lcs_fix_multicast_list(struct lcs_card *card)
1112 {
1113 struct list_head failed_list;
1114 struct lcs_ipm_list *ipm, *tmp;
1115 unsigned long flags;
1116 int rc;
1117
1118 LCS_DBF_TEXT(4,trace, "fixipm");
1119 INIT_LIST_HEAD(&failed_list);
1120 spin_lock_irqsave(&card->ipm_lock, flags);
1121 list_modified:
1122 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1123 switch (ipm->ipm_state) {
1124 case LCS_IPM_STATE_SET_REQUIRED:
1125 /* del from ipm_list so no one else can tamper with
1126 * this entry */
1127 list_del_init(&ipm->list);
1128 spin_unlock_irqrestore(&card->ipm_lock, flags);
1129 rc = lcs_send_setipm(card, ipm);
1130 spin_lock_irqsave(&card->ipm_lock, flags);
1131 if (rc) {
1132 pr_info("Adding multicast address failed."
1133 " Table possibly full!\n");
1134 /* store ipm in failed list -> will be added
1135 * to ipm_list again, so a retry will be done
1136 * during the next call of this function */
1137 list_add_tail(&ipm->list, &failed_list);
1138 } else {
1139 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1140 /* re-insert into ipm_list */
1141 list_add_tail(&ipm->list, &card->ipm_list);
1142 }
1143 goto list_modified;
1144 case LCS_IPM_STATE_DEL_REQUIRED:
1145 list_del(&ipm->list);
1146 spin_unlock_irqrestore(&card->ipm_lock, flags);
1147 lcs_send_delipm(card, ipm);
1148 spin_lock_irqsave(&card->ipm_lock, flags);
1149 kfree(ipm);
1150 goto list_modified;
1151 case LCS_IPM_STATE_ON_CARD:
1152 break;
1153 }
1154 }
1155 /* re-insert all entries from the failed_list into ipm_list */
1156 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1157 list_move_tail(&ipm->list, &card->ipm_list);
1158
1159 spin_unlock_irqrestore(&card->ipm_lock, flags);
1160 }
1161
1162 /**
1163 * get mac address for the relevant Multicast address
1164 */
1165 static void
1166 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1167 {
1168 LCS_DBF_TEXT(4,trace, "getmac");
1169 if (dev->type == ARPHRD_IEEE802_TR)
1170 ip_tr_mc_map(ipm, mac);
1171 else
1172 ip_eth_mc_map(ipm, mac);
1173 }
1174
1175 /**
1176 * function called by net device to handle multicast address relevant things
1177 */
1178 static inline void
1179 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1180 {
1181 struct ip_mc_list *im4;
1182 struct list_head *l;
1183 struct lcs_ipm_list *ipm;
1184 unsigned long flags;
1185 char buf[MAX_ADDR_LEN];
1186
1187 LCS_DBF_TEXT(4, trace, "remmclst");
1188 spin_lock_irqsave(&card->ipm_lock, flags);
1189 list_for_each(l, &card->ipm_list) {
1190 ipm = list_entry(l, struct lcs_ipm_list, list);
1191 for (im4 = rcu_dereference(in4_dev->mc_list);
1192 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1193 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1194 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1195 (memcmp(buf, &ipm->ipm.mac_addr,
1196 LCS_MAC_LENGTH) == 0) )
1197 break;
1198 }
1199 if (im4 == NULL)
1200 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1201 }
1202 spin_unlock_irqrestore(&card->ipm_lock, flags);
1203 }
1204
1205 static inline struct lcs_ipm_list *
1206 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1207 {
1208 struct lcs_ipm_list *tmp, *ipm = NULL;
1209 struct list_head *l;
1210 unsigned long flags;
1211
1212 LCS_DBF_TEXT(4, trace, "chkmcent");
1213 spin_lock_irqsave(&card->ipm_lock, flags);
1214 list_for_each(l, &card->ipm_list) {
1215 tmp = list_entry(l, struct lcs_ipm_list, list);
1216 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1217 (memcmp(buf, &tmp->ipm.mac_addr,
1218 LCS_MAC_LENGTH) == 0) ) {
1219 ipm = tmp;
1220 break;
1221 }
1222 }
1223 spin_unlock_irqrestore(&card->ipm_lock, flags);
1224 return ipm;
1225 }
1226
1227 static inline void
1228 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1229 {
1230
1231 struct ip_mc_list *im4;
1232 struct lcs_ipm_list *ipm;
1233 char buf[MAX_ADDR_LEN];
1234 unsigned long flags;
1235
1236 LCS_DBF_TEXT(4, trace, "setmclst");
1237 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1238 im4 = rcu_dereference(im4->next_rcu)) {
1239 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1240 ipm = lcs_check_addr_entry(card, im4, buf);
1241 if (ipm != NULL)
1242 continue; /* Address already in list. */
1243 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1244 if (ipm == NULL) {
1245 pr_info("Not enough memory to add"
1246 " new multicast entry!\n");
1247 break;
1248 }
1249 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1250 ipm->ipm.ip_addr = im4->multiaddr;
1251 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1252 spin_lock_irqsave(&card->ipm_lock, flags);
1253 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1254 list_add(&ipm->list, &card->ipm_list);
1255 spin_unlock_irqrestore(&card->ipm_lock, flags);
1256 }
1257 }
1258
1259 static int
1260 lcs_register_mc_addresses(void *data)
1261 {
1262 struct lcs_card *card;
1263 struct in_device *in4_dev;
1264
1265 card = (struct lcs_card *) data;
1266
1267 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1268 return 0;
1269 LCS_DBF_TEXT(4, trace, "regmulti");
1270
1271 in4_dev = in_dev_get(card->dev);
1272 if (in4_dev == NULL)
1273 goto out;
1274 rcu_read_lock();
1275 lcs_remove_mc_addresses(card,in4_dev);
1276 lcs_set_mc_addresses(card, in4_dev);
1277 rcu_read_unlock();
1278 in_dev_put(in4_dev);
1279
1280 netif_carrier_off(card->dev);
1281 netif_tx_disable(card->dev);
1282 wait_event(card->write.wait_q,
1283 (card->write.state != LCS_CH_STATE_RUNNING));
1284 lcs_fix_multicast_list(card);
1285 if (card->state == DEV_STATE_UP) {
1286 netif_carrier_on(card->dev);
1287 netif_wake_queue(card->dev);
1288 }
1289 out:
1290 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1291 return 0;
1292 }
1293 #endif /* CONFIG_IP_MULTICAST */
1294
1295 /**
1296 * function called by net device to
1297 * handle multicast address relevant things
1298 */
1299 static void
1300 lcs_set_multicast_list(struct net_device *dev)
1301 {
1302 #ifdef CONFIG_IP_MULTICAST
1303 struct lcs_card *card;
1304
1305 LCS_DBF_TEXT(4, trace, "setmulti");
1306 card = (struct lcs_card *) dev->ml_priv;
1307
1308 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1309 schedule_work(&card->kernel_thread_starter);
1310 #endif /* CONFIG_IP_MULTICAST */
1311 }
1312
1313 static long
1314 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1315 {
1316 if (!IS_ERR(irb))
1317 return 0;
1318
1319 switch (PTR_ERR(irb)) {
1320 case -EIO:
1321 dev_warn(&cdev->dev,
1322 "An I/O-error occurred on the LCS device\n");
1323 LCS_DBF_TEXT(2, trace, "ckirberr");
1324 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1325 break;
1326 case -ETIMEDOUT:
1327 dev_warn(&cdev->dev,
1328 "A command timed out on the LCS device\n");
1329 LCS_DBF_TEXT(2, trace, "ckirberr");
1330 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1331 break;
1332 default:
1333 dev_warn(&cdev->dev,
1334 "An error occurred on the LCS device, rc=%ld\n",
1335 PTR_ERR(irb));
1336 LCS_DBF_TEXT(2, trace, "ckirberr");
1337 LCS_DBF_TEXT(2, trace, " rc???");
1338 }
1339 return PTR_ERR(irb);
1340 }
1341
1342 static int
1343 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1344 {
1345 int dstat, cstat;
1346 char *sense;
1347
1348 sense = (char *) irb->ecw;
1349 cstat = irb->scsw.cmd.cstat;
1350 dstat = irb->scsw.cmd.dstat;
1351
1352 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1353 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1354 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1355 LCS_DBF_TEXT(2, trace, "CGENCHK");
1356 return 1;
1357 }
1358 if (dstat & DEV_STAT_UNIT_CHECK) {
1359 if (sense[LCS_SENSE_BYTE_1] &
1360 LCS_SENSE_RESETTING_EVENT) {
1361 LCS_DBF_TEXT(2, trace, "REVIND");
1362 return 1;
1363 }
1364 if (sense[LCS_SENSE_BYTE_0] &
1365 LCS_SENSE_CMD_REJECT) {
1366 LCS_DBF_TEXT(2, trace, "CMDREJ");
1367 return 0;
1368 }
1369 if ((!sense[LCS_SENSE_BYTE_0]) &&
1370 (!sense[LCS_SENSE_BYTE_1]) &&
1371 (!sense[LCS_SENSE_BYTE_2]) &&
1372 (!sense[LCS_SENSE_BYTE_3])) {
1373 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1374 return 0;
1375 }
1376 LCS_DBF_TEXT(2, trace, "DGENCHK");
1377 return 1;
1378 }
1379 return 0;
1380 }
1381
1382 static void
1383 lcs_schedule_recovery(struct lcs_card *card)
1384 {
1385 LCS_DBF_TEXT(2, trace, "startrec");
1386 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1387 schedule_work(&card->kernel_thread_starter);
1388 }
1389
1390 /**
1391 * IRQ Handler for LCS channels
1392 */
1393 static void
1394 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1395 {
1396 struct lcs_card *card;
1397 struct lcs_channel *channel;
1398 int rc, index;
1399 int cstat, dstat;
1400
1401 if (lcs_check_irb_error(cdev, irb))
1402 return;
1403
1404 card = CARD_FROM_DEV(cdev);
1405 if (card->read.ccwdev == cdev)
1406 channel = &card->read;
1407 else
1408 channel = &card->write;
1409
1410 cstat = irb->scsw.cmd.cstat;
1411 dstat = irb->scsw.cmd.dstat;
1412 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1413 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1414 irb->scsw.cmd.dstat);
1415 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1416 irb->scsw.cmd.actl);
1417
1418 /* Check for channel and device errors presented */
1419 rc = lcs_get_problem(cdev, irb);
1420 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1421 dev_warn(&cdev->dev,
1422 "The LCS device stopped because of an error,"
1423 " dstat=0x%X, cstat=0x%X \n",
1424 dstat, cstat);
1425 if (rc) {
1426 channel->state = LCS_CH_STATE_ERROR;
1427 }
1428 }
1429 if (channel->state == LCS_CH_STATE_ERROR) {
1430 lcs_schedule_recovery(card);
1431 wake_up(&card->wait_q);
1432 return;
1433 }
1434 /* How far in the ccw chain have we processed? */
1435 if ((channel->state != LCS_CH_STATE_INIT) &&
1436 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1437 (irb->scsw.cmd.cpa != 0)) {
1438 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1439 - channel->ccws;
1440 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1441 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1442 /* Bloody io subsystem tells us lies about cpa... */
1443 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1444 while (channel->io_idx != index) {
1445 __lcs_processed_buffer(channel,
1446 channel->iob + channel->io_idx);
1447 channel->io_idx =
1448 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1449 }
1450 }
1451
1452 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1453 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1454 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1455 /* Mark channel as stopped. */
1456 channel->state = LCS_CH_STATE_STOPPED;
1457 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1458 /* CCW execution stopped on a suspend bit. */
1459 channel->state = LCS_CH_STATE_SUSPENDED;
1460 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1461 if (irb->scsw.cmd.cc != 0) {
1462 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1463 return;
1464 }
1465 /* The channel has been stopped by halt_IO. */
1466 channel->state = LCS_CH_STATE_HALTED;
1467 }
1468 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1469 channel->state = LCS_CH_STATE_CLEARED;
1470 /* Do the rest in the tasklet. */
1471 tasklet_schedule(&channel->irq_tasklet);
1472 }
1473
1474 /**
1475 * Tasklet for IRQ handler
1476 */
1477 static void
1478 lcs_tasklet(unsigned long data)
1479 {
1480 unsigned long flags;
1481 struct lcs_channel *channel;
1482 struct lcs_buffer *iob;
1483 int buf_idx;
1484
1485 channel = (struct lcs_channel *) data;
1486 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1487
1488 /* Check for processed buffers. */
1489 iob = channel->iob;
1490 buf_idx = channel->buf_idx;
1491 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1492 /* Do the callback thing. */
1493 if (iob[buf_idx].callback != NULL)
1494 iob[buf_idx].callback(channel, iob + buf_idx);
1495 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1496 }
1497 channel->buf_idx = buf_idx;
1498
1499 if (channel->state == LCS_CH_STATE_STOPPED)
1500 lcs_start_channel(channel);
1501 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1502 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1503 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1504 __lcs_resume_channel(channel);
1505 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1506
1507 /* Something happened on the channel. Wake up waiters. */
1508 wake_up(&channel->wait_q);
1509 }
1510
1511 /**
1512 * Finish current tx buffer and make it ready for transmit.
1513 */
1514 static void
1515 __lcs_emit_txbuffer(struct lcs_card *card)
1516 {
1517 LCS_DBF_TEXT(5, trace, "emittx");
1518 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1519 card->tx_buffer->count += 2;
1520 lcs_ready_buffer(&card->write, card->tx_buffer);
1521 card->tx_buffer = NULL;
1522 card->tx_emitted++;
1523 }
1524
1525 /**
1526 * Callback for finished tx buffers.
1527 */
1528 static void
1529 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1530 {
1531 struct lcs_card *card;
1532
1533 LCS_DBF_TEXT(5, trace, "txbuffcb");
1534 /* Put buffer back to pool. */
1535 lcs_release_buffer(channel, buffer);
1536 card = container_of(channel, struct lcs_card, write);
1537 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1538 netif_wake_queue(card->dev);
1539 spin_lock(&card->lock);
1540 card->tx_emitted--;
1541 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1542 /*
1543 * Last running tx buffer has finished. Submit partially
1544 * filled current buffer.
1545 */
1546 __lcs_emit_txbuffer(card);
1547 spin_unlock(&card->lock);
1548 }
1549
1550 /**
1551 * Packet transmit function called by network stack
1552 */
1553 static int
1554 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1555 struct net_device *dev)
1556 {
1557 struct lcs_header *header;
1558 int rc = NETDEV_TX_OK;
1559
1560 LCS_DBF_TEXT(5, trace, "hardxmit");
1561 if (skb == NULL) {
1562 card->stats.tx_dropped++;
1563 card->stats.tx_errors++;
1564 return NETDEV_TX_OK;
1565 }
1566 if (card->state != DEV_STATE_UP) {
1567 dev_kfree_skb(skb);
1568 card->stats.tx_dropped++;
1569 card->stats.tx_errors++;
1570 card->stats.tx_carrier_errors++;
1571 return NETDEV_TX_OK;
1572 }
1573 if (skb->protocol == htons(ETH_P_IPV6)) {
1574 dev_kfree_skb(skb);
1575 return NETDEV_TX_OK;
1576 }
1577 netif_stop_queue(card->dev);
1578 spin_lock(&card->lock);
1579 if (card->tx_buffer != NULL &&
1580 card->tx_buffer->count + sizeof(struct lcs_header) +
1581 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1582 /* skb too big for current tx buffer. */
1583 __lcs_emit_txbuffer(card);
1584 if (card->tx_buffer == NULL) {
1585 /* Get new tx buffer */
1586 card->tx_buffer = lcs_get_buffer(&card->write);
1587 if (card->tx_buffer == NULL) {
1588 card->stats.tx_dropped++;
1589 rc = NETDEV_TX_BUSY;
1590 goto out;
1591 }
1592 card->tx_buffer->callback = lcs_txbuffer_cb;
1593 card->tx_buffer->count = 0;
1594 }
1595 header = (struct lcs_header *)
1596 (card->tx_buffer->data + card->tx_buffer->count);
1597 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1598 header->offset = card->tx_buffer->count;
1599 header->type = card->lan_type;
1600 header->slot = card->portno;
1601 skb_copy_from_linear_data(skb, header + 1, skb->len);
1602 spin_unlock(&card->lock);
1603 card->stats.tx_bytes += skb->len;
1604 card->stats.tx_packets++;
1605 dev_kfree_skb(skb);
1606 netif_wake_queue(card->dev);
1607 spin_lock(&card->lock);
1608 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1609 /* If this is the first tx buffer emit it immediately. */
1610 __lcs_emit_txbuffer(card);
1611 out:
1612 spin_unlock(&card->lock);
1613 return rc;
1614 }
1615
1616 static int
1617 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1618 {
1619 struct lcs_card *card;
1620 int rc;
1621
1622 LCS_DBF_TEXT(5, trace, "pktxmit");
1623 card = (struct lcs_card *) dev->ml_priv;
1624 rc = __lcs_start_xmit(card, skb, dev);
1625 return rc;
1626 }
1627
1628 /**
1629 * send startlan and lanstat command to make LCS device ready
1630 */
1631 static int
1632 lcs_startlan_auto(struct lcs_card *card)
1633 {
1634 int rc;
1635
1636 LCS_DBF_TEXT(2, trace, "strtauto");
1637 #ifdef CONFIG_ETHERNET
1638 card->lan_type = LCS_FRAME_TYPE_ENET;
1639 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1640 if (rc == 0)
1641 return 0;
1642
1643 #endif
1644 #ifdef CONFIG_TR
1645 card->lan_type = LCS_FRAME_TYPE_TR;
1646 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1647 if (rc == 0)
1648 return 0;
1649 #endif
1650 #ifdef CONFIG_FDDI
1651 card->lan_type = LCS_FRAME_TYPE_FDDI;
1652 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1653 if (rc == 0)
1654 return 0;
1655 #endif
1656 return -EIO;
1657 }
1658
1659 static int
1660 lcs_startlan(struct lcs_card *card)
1661 {
1662 int rc, i;
1663
1664 LCS_DBF_TEXT(2, trace, "startlan");
1665 rc = 0;
1666 if (card->portno != LCS_INVALID_PORT_NO) {
1667 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1668 rc = lcs_startlan_auto(card);
1669 else
1670 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1671 } else {
1672 for (i = 0; i <= 16; i++) {
1673 card->portno = i;
1674 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1675 rc = lcs_send_startlan(card,
1676 LCS_INITIATOR_TCPIP);
1677 else
1678 /* autodetecting lan type */
1679 rc = lcs_startlan_auto(card);
1680 if (rc == 0)
1681 break;
1682 }
1683 }
1684 if (rc == 0)
1685 return lcs_send_lanstat(card);
1686 return rc;
1687 }
1688
1689 /**
1690 * LCS detect function
1691 * setup channels and make them I/O ready
1692 */
1693 static int
1694 lcs_detect(struct lcs_card *card)
1695 {
1696 int rc = 0;
1697
1698 LCS_DBF_TEXT(2, setup, "lcsdetct");
1699 /* start/reset card */
1700 if (card->dev)
1701 netif_stop_queue(card->dev);
1702 rc = lcs_stop_channels(card);
1703 if (rc == 0) {
1704 rc = lcs_start_channels(card);
1705 if (rc == 0) {
1706 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1707 if (rc == 0)
1708 rc = lcs_startlan(card);
1709 }
1710 }
1711 if (rc == 0) {
1712 card->state = DEV_STATE_UP;
1713 } else {
1714 card->state = DEV_STATE_DOWN;
1715 card->write.state = LCS_CH_STATE_INIT;
1716 card->read.state = LCS_CH_STATE_INIT;
1717 }
1718 return rc;
1719 }
1720
1721 /**
1722 * LCS Stop card
1723 */
1724 static int
1725 lcs_stopcard(struct lcs_card *card)
1726 {
1727 int rc;
1728
1729 LCS_DBF_TEXT(3, setup, "stopcard");
1730
1731 if (card->read.state != LCS_CH_STATE_STOPPED &&
1732 card->write.state != LCS_CH_STATE_STOPPED &&
1733 card->read.state != LCS_CH_STATE_ERROR &&
1734 card->write.state != LCS_CH_STATE_ERROR &&
1735 card->state == DEV_STATE_UP) {
1736 lcs_clear_multicast_list(card);
1737 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1738 rc = lcs_send_shutdown(card);
1739 }
1740 rc = lcs_stop_channels(card);
1741 card->state = DEV_STATE_DOWN;
1742
1743 return rc;
1744 }
1745
1746 /**
1747 * Kernel Thread helper functions for LGW initiated commands
1748 */
1749 static void
1750 lcs_start_kernel_thread(struct work_struct *work)
1751 {
1752 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1753 LCS_DBF_TEXT(5, trace, "krnthrd");
1754 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1755 kthread_run(lcs_recovery, card, "lcs_recover");
1756 #ifdef CONFIG_IP_MULTICAST
1757 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1758 kthread_run(lcs_register_mc_addresses, card, "regipm");
1759 #endif
1760 }
1761
1762 /**
1763 * Process control frames.
1764 */
1765 static void
1766 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1767 {
1768 LCS_DBF_TEXT(5, trace, "getctrl");
1769 if (cmd->initiator == LCS_INITIATOR_LGW) {
1770 switch(cmd->cmd_code) {
1771 case LCS_CMD_STARTUP:
1772 case LCS_CMD_STARTLAN:
1773 lcs_schedule_recovery(card);
1774 break;
1775 case LCS_CMD_STOPLAN:
1776 pr_warning("Stoplan for %s initiated by LGW.\n",
1777 card->dev->name);
1778 if (card->dev)
1779 netif_carrier_off(card->dev);
1780 break;
1781 default:
1782 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1783 break;
1784 }
1785 } else
1786 lcs_notify_lancmd_waiters(card, cmd);
1787 }
1788
1789 /**
1790 * Unpack network packet.
1791 */
1792 static void
1793 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1794 {
1795 struct sk_buff *skb;
1796
1797 LCS_DBF_TEXT(5, trace, "getskb");
1798 if (card->dev == NULL ||
1799 card->state != DEV_STATE_UP)
1800 /* The card isn't up. Ignore the packet. */
1801 return;
1802
1803 skb = dev_alloc_skb(skb_len);
1804 if (skb == NULL) {
1805 dev_err(&card->dev->dev,
1806 " Allocating a socket buffer to interface %s failed\n",
1807 card->dev->name);
1808 card->stats.rx_dropped++;
1809 return;
1810 }
1811 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1812 skb->protocol = card->lan_type_trans(skb, card->dev);
1813 card->stats.rx_bytes += skb_len;
1814 card->stats.rx_packets++;
1815 if (skb->protocol == htons(ETH_P_802_2))
1816 *((__u32 *)skb->cb) = ++card->pkt_seq;
1817 netif_rx(skb);
1818 }
1819
1820 /**
1821 * LCS main routine to get packets and lancmd replies from the buffers
1822 */
1823 static void
1824 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1825 {
1826 struct lcs_card *card;
1827 struct lcs_header *lcs_hdr;
1828 __u16 offset;
1829
1830 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1831 lcs_hdr = (struct lcs_header *) buffer->data;
1832 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1833 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1834 return;
1835 }
1836 card = container_of(channel, struct lcs_card, read);
1837 offset = 0;
1838 while (lcs_hdr->offset != 0) {
1839 if (lcs_hdr->offset <= 0 ||
1840 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1841 lcs_hdr->offset < offset) {
1842 /* Offset invalid. */
1843 card->stats.rx_length_errors++;
1844 card->stats.rx_errors++;
1845 return;
1846 }
1847 /* What kind of frame is it? */
1848 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1849 /* Control frame. */
1850 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1851 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1852 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1853 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1854 /* Normal network packet. */
1855 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1856 lcs_hdr->offset - offset -
1857 sizeof(struct lcs_header));
1858 else
1859 /* Unknown frame type. */
1860 ; // FIXME: error message ?
1861 /* Proceed to next frame. */
1862 offset = lcs_hdr->offset;
1863 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1864 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1865 }
1866 /* The buffer is now empty. Make it ready again. */
1867 lcs_ready_buffer(&card->read, buffer);
1868 }
1869
1870 /**
1871 * get network statistics for ifconfig and other user programs
1872 */
1873 static struct net_device_stats *
1874 lcs_getstats(struct net_device *dev)
1875 {
1876 struct lcs_card *card;
1877
1878 LCS_DBF_TEXT(4, trace, "netstats");
1879 card = (struct lcs_card *) dev->ml_priv;
1880 return &card->stats;
1881 }
1882
1883 /**
1884 * stop lcs device
1885 * This function will be called by user doing ifconfig xxx down
1886 */
1887 static int
1888 lcs_stop_device(struct net_device *dev)
1889 {
1890 struct lcs_card *card;
1891 int rc;
1892
1893 LCS_DBF_TEXT(2, trace, "stopdev");
1894 card = (struct lcs_card *) dev->ml_priv;
1895 netif_carrier_off(dev);
1896 netif_tx_disable(dev);
1897 dev->flags &= ~IFF_UP;
1898 wait_event(card->write.wait_q,
1899 (card->write.state != LCS_CH_STATE_RUNNING));
1900 rc = lcs_stopcard(card);
1901 if (rc)
1902 dev_err(&card->dev->dev,
1903 " Shutting down the LCS device failed\n ");
1904 return rc;
1905 }
1906
1907 /**
1908 * start lcs device and make it runnable
1909 * This function will be called by user doing ifconfig xxx up
1910 */
1911 static int
1912 lcs_open_device(struct net_device *dev)
1913 {
1914 struct lcs_card *card;
1915 int rc;
1916
1917 LCS_DBF_TEXT(2, trace, "opendev");
1918 card = (struct lcs_card *) dev->ml_priv;
1919 /* initialize statistics */
1920 rc = lcs_detect(card);
1921 if (rc) {
1922 pr_err("Error in opening device!\n");
1923
1924 } else {
1925 dev->flags |= IFF_UP;
1926 netif_carrier_on(dev);
1927 netif_wake_queue(dev);
1928 card->state = DEV_STATE_UP;
1929 }
1930 return rc;
1931 }
1932
1933 /**
1934 * show function for portno called by cat or similar things
1935 */
1936 static ssize_t
1937 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1938 {
1939 struct lcs_card *card;
1940
1941 card = dev_get_drvdata(dev);
1942
1943 if (!card)
1944 return 0;
1945
1946 return sprintf(buf, "%d\n", card->portno);
1947 }
1948
1949 /**
1950 * store the value which is piped to file portno
1951 */
1952 static ssize_t
1953 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1954 {
1955 struct lcs_card *card;
1956 int value;
1957
1958 card = dev_get_drvdata(dev);
1959
1960 if (!card)
1961 return 0;
1962
1963 sscanf(buf, "%u", &value);
1964 /* TODO: sanity checks */
1965 card->portno = value;
1966
1967 return count;
1968
1969 }
1970
1971 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1972
1973 static const char *lcs_type[] = {
1974 "not a channel",
1975 "2216 parallel",
1976 "2216 channel",
1977 "OSA LCS card",
1978 "unknown channel type",
1979 "unsupported channel type",
1980 };
1981
1982 static ssize_t
1983 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1984 {
1985 struct ccwgroup_device *cgdev;
1986
1987 cgdev = to_ccwgroupdev(dev);
1988 if (!cgdev)
1989 return -ENODEV;
1990
1991 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1992 }
1993
1994 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1995
1996 static ssize_t
1997 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1998 {
1999 struct lcs_card *card;
2000
2001 card = dev_get_drvdata(dev);
2002
2003 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2004 }
2005
2006 static ssize_t
2007 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2008 {
2009 struct lcs_card *card;
2010 int value;
2011
2012 card = dev_get_drvdata(dev);
2013
2014 if (!card)
2015 return 0;
2016
2017 sscanf(buf, "%u", &value);
2018 /* TODO: sanity checks */
2019 card->lancmd_timeout = value;
2020
2021 return count;
2022
2023 }
2024
2025 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2026
2027 static ssize_t
2028 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2029 const char *buf, size_t count)
2030 {
2031 struct lcs_card *card = dev_get_drvdata(dev);
2032 char *tmp;
2033 int i;
2034
2035 if (!card)
2036 return -EINVAL;
2037 if (card->state != DEV_STATE_UP)
2038 return -EPERM;
2039 i = simple_strtoul(buf, &tmp, 16);
2040 if (i == 1)
2041 lcs_schedule_recovery(card);
2042 return count;
2043 }
2044
2045 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2046
2047 static struct attribute * lcs_attrs[] = {
2048 &dev_attr_portno.attr,
2049 &dev_attr_type.attr,
2050 &dev_attr_lancmd_timeout.attr,
2051 &dev_attr_recover.attr,
2052 NULL,
2053 };
2054
2055 static struct attribute_group lcs_attr_group = {
2056 .attrs = lcs_attrs,
2057 };
2058
2059 /**
2060 * lcs_probe_device is called on establishing a new ccwgroup_device.
2061 */
2062 static int
2063 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2064 {
2065 struct lcs_card *card;
2066 int ret;
2067
2068 if (!get_device(&ccwgdev->dev))
2069 return -ENODEV;
2070
2071 LCS_DBF_TEXT(2, setup, "add_dev");
2072 card = lcs_alloc_card();
2073 if (!card) {
2074 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2075 put_device(&ccwgdev->dev);
2076 return -ENOMEM;
2077 }
2078 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2079 if (ret) {
2080 lcs_free_card(card);
2081 put_device(&ccwgdev->dev);
2082 return ret;
2083 }
2084 dev_set_drvdata(&ccwgdev->dev, card);
2085 ccwgdev->cdev[0]->handler = lcs_irq;
2086 ccwgdev->cdev[1]->handler = lcs_irq;
2087 card->gdev = ccwgdev;
2088 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2089 card->thread_start_mask = 0;
2090 card->thread_allowed_mask = 0;
2091 card->thread_running_mask = 0;
2092 return 0;
2093 }
2094
2095 static int
2096 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2097 {
2098 struct lcs_card *card;
2099
2100 LCS_DBF_TEXT(2, setup, "regnetdv");
2101 card = dev_get_drvdata(&ccwgdev->dev);
2102 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2103 return 0;
2104 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2105 return register_netdev(card->dev);
2106 }
2107
2108 /**
2109 * lcs_new_device will be called by setting the group device online.
2110 */
2111 static const struct net_device_ops lcs_netdev_ops = {
2112 .ndo_open = lcs_open_device,
2113 .ndo_stop = lcs_stop_device,
2114 .ndo_get_stats = lcs_getstats,
2115 .ndo_start_xmit = lcs_start_xmit,
2116 };
2117
2118 static const struct net_device_ops lcs_mc_netdev_ops = {
2119 .ndo_open = lcs_open_device,
2120 .ndo_stop = lcs_stop_device,
2121 .ndo_get_stats = lcs_getstats,
2122 .ndo_start_xmit = lcs_start_xmit,
2123 .ndo_set_rx_mode = lcs_set_multicast_list,
2124 };
2125
2126 static int
2127 lcs_new_device(struct ccwgroup_device *ccwgdev)
2128 {
2129 struct lcs_card *card;
2130 struct net_device *dev=NULL;
2131 enum lcs_dev_states recover_state;
2132 int rc;
2133
2134 card = dev_get_drvdata(&ccwgdev->dev);
2135 if (!card)
2136 return -ENODEV;
2137
2138 LCS_DBF_TEXT(2, setup, "newdev");
2139 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2140 card->read.ccwdev = ccwgdev->cdev[0];
2141 card->write.ccwdev = ccwgdev->cdev[1];
2142
2143 recover_state = card->state;
2144 rc = ccw_device_set_online(card->read.ccwdev);
2145 if (rc)
2146 goto out_err;
2147 rc = ccw_device_set_online(card->write.ccwdev);
2148 if (rc)
2149 goto out_werr;
2150
2151 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2152
2153 lcs_setup_card(card);
2154 rc = lcs_detect(card);
2155 if (rc) {
2156 LCS_DBF_TEXT(2, setup, "dtctfail");
2157 dev_err(&card->dev->dev,
2158 "Detecting a network adapter for LCS devices"
2159 " failed with rc=%d (0x%x)\n", rc, rc);
2160 lcs_stopcard(card);
2161 goto out;
2162 }
2163 if (card->dev) {
2164 LCS_DBF_TEXT(2, setup, "samedev");
2165 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2166 goto netdev_out;
2167 }
2168 switch (card->lan_type) {
2169 #ifdef CONFIG_ETHERNET
2170 case LCS_FRAME_TYPE_ENET:
2171 card->lan_type_trans = eth_type_trans;
2172 dev = alloc_etherdev(0);
2173 break;
2174 #endif
2175 #ifdef CONFIG_TR
2176 case LCS_FRAME_TYPE_TR:
2177 card->lan_type_trans = tr_type_trans;
2178 dev = alloc_trdev(0);
2179 break;
2180 #endif
2181 #ifdef CONFIG_FDDI
2182 case LCS_FRAME_TYPE_FDDI:
2183 card->lan_type_trans = fddi_type_trans;
2184 dev = alloc_fddidev(0);
2185 break;
2186 #endif
2187 default:
2188 LCS_DBF_TEXT(3, setup, "errinit");
2189 pr_err(" Initialization failed\n");
2190 goto out;
2191 }
2192 if (!dev)
2193 goto out;
2194 card->dev = dev;
2195 card->dev->ml_priv = card;
2196 card->dev->netdev_ops = &lcs_netdev_ops;
2197 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2198 #ifdef CONFIG_IP_MULTICAST
2199 if (!lcs_check_multicast_support(card))
2200 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2201 #endif
2202 netdev_out:
2203 lcs_set_allowed_threads(card,0xffffffff);
2204 if (recover_state == DEV_STATE_RECOVER) {
2205 lcs_set_multicast_list(card->dev);
2206 card->dev->flags |= IFF_UP;
2207 netif_carrier_on(card->dev);
2208 netif_wake_queue(card->dev);
2209 card->state = DEV_STATE_UP;
2210 } else {
2211 lcs_stopcard(card);
2212 }
2213
2214 if (lcs_register_netdev(ccwgdev) != 0)
2215 goto out;
2216
2217 /* Print out supported assists: IPv6 */
2218 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2219 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2220 "with" : "without");
2221 /* Print out supported assist: Multicast */
2222 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2223 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2224 "with" : "without");
2225 return 0;
2226 out:
2227
2228 ccw_device_set_offline(card->write.ccwdev);
2229 out_werr:
2230 ccw_device_set_offline(card->read.ccwdev);
2231 out_err:
2232 return -ENODEV;
2233 }
2234
2235 /**
2236 * lcs_shutdown_device, called when setting the group device offline.
2237 */
2238 static int
2239 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2240 {
2241 struct lcs_card *card;
2242 enum lcs_dev_states recover_state;
2243 int ret;
2244
2245 LCS_DBF_TEXT(3, setup, "shtdndev");
2246 card = dev_get_drvdata(&ccwgdev->dev);
2247 if (!card)
2248 return -ENODEV;
2249 if (recovery_mode == 0) {
2250 lcs_set_allowed_threads(card, 0);
2251 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2252 return -ERESTARTSYS;
2253 }
2254 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2255 recover_state = card->state;
2256
2257 ret = lcs_stop_device(card->dev);
2258 ret = ccw_device_set_offline(card->read.ccwdev);
2259 ret = ccw_device_set_offline(card->write.ccwdev);
2260 if (recover_state == DEV_STATE_UP) {
2261 card->state = DEV_STATE_RECOVER;
2262 }
2263 if (ret)
2264 return ret;
2265 return 0;
2266 }
2267
2268 static int
2269 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2270 {
2271 return __lcs_shutdown_device(ccwgdev, 0);
2272 }
2273
2274 /**
2275 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2276 */
2277 static int
2278 lcs_recovery(void *ptr)
2279 {
2280 struct lcs_card *card;
2281 struct ccwgroup_device *gdev;
2282 int rc;
2283
2284 card = (struct lcs_card *) ptr;
2285
2286 LCS_DBF_TEXT(4, trace, "recover1");
2287 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2288 return 0;
2289 LCS_DBF_TEXT(4, trace, "recover2");
2290 gdev = card->gdev;
2291 dev_warn(&gdev->dev,
2292 "A recovery process has been started for the LCS device\n");
2293 rc = __lcs_shutdown_device(gdev, 1);
2294 rc = lcs_new_device(gdev);
2295 if (!rc)
2296 pr_info("Device %s successfully recovered!\n",
2297 card->dev->name);
2298 else
2299 pr_info("Device %s could not be recovered!\n",
2300 card->dev->name);
2301 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2302 return 0;
2303 }
2304
2305 /**
2306 * lcs_remove_device, free buffers and card
2307 */
2308 static void
2309 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2310 {
2311 struct lcs_card *card;
2312
2313 card = dev_get_drvdata(&ccwgdev->dev);
2314 if (!card)
2315 return;
2316
2317 LCS_DBF_TEXT(3, setup, "remdev");
2318 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2319 if (ccwgdev->state == CCWGROUP_ONLINE) {
2320 lcs_shutdown_device(ccwgdev);
2321 }
2322 if (card->dev)
2323 unregister_netdev(card->dev);
2324 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2325 lcs_cleanup_card(card);
2326 lcs_free_card(card);
2327 put_device(&ccwgdev->dev);
2328 }
2329
2330 static int lcs_pm_suspend(struct lcs_card *card)
2331 {
2332 if (card->dev)
2333 netif_device_detach(card->dev);
2334 lcs_set_allowed_threads(card, 0);
2335 lcs_wait_for_threads(card, 0xffffffff);
2336 if (card->state != DEV_STATE_DOWN)
2337 __lcs_shutdown_device(card->gdev, 1);
2338 return 0;
2339 }
2340
2341 static int lcs_pm_resume(struct lcs_card *card)
2342 {
2343 int rc = 0;
2344
2345 if (card->state == DEV_STATE_RECOVER)
2346 rc = lcs_new_device(card->gdev);
2347 if (card->dev)
2348 netif_device_attach(card->dev);
2349 if (rc) {
2350 dev_warn(&card->gdev->dev, "The lcs device driver "
2351 "failed to recover the device\n");
2352 }
2353 return rc;
2354 }
2355
2356 static int lcs_prepare(struct ccwgroup_device *gdev)
2357 {
2358 return 0;
2359 }
2360
2361 static void lcs_complete(struct ccwgroup_device *gdev)
2362 {
2363 return;
2364 }
2365
2366 static int lcs_freeze(struct ccwgroup_device *gdev)
2367 {
2368 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2369 return lcs_pm_suspend(card);
2370 }
2371
2372 static int lcs_thaw(struct ccwgroup_device *gdev)
2373 {
2374 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2375 return lcs_pm_resume(card);
2376 }
2377
2378 static int lcs_restore(struct ccwgroup_device *gdev)
2379 {
2380 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2381 return lcs_pm_resume(card);
2382 }
2383
2384 static struct ccw_device_id lcs_ids[] = {
2385 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2386 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2387 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2388 {},
2389 };
2390 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2391
2392 static struct ccw_driver lcs_ccw_driver = {
2393 .driver = {
2394 .owner = THIS_MODULE,
2395 .name = "lcs",
2396 },
2397 .ids = lcs_ids,
2398 .probe = ccwgroup_probe_ccwdev,
2399 .remove = ccwgroup_remove_ccwdev,
2400 .int_class = IOINT_LCS,
2401 };
2402
2403 /**
2404 * LCS ccwgroup driver registration
2405 */
2406 static struct ccwgroup_driver lcs_group_driver = {
2407 .driver = {
2408 .owner = THIS_MODULE,
2409 .name = "lcs",
2410 },
2411 .max_slaves = 2,
2412 .driver_id = 0xD3C3E2,
2413 .probe = lcs_probe_device,
2414 .remove = lcs_remove_device,
2415 .set_online = lcs_new_device,
2416 .set_offline = lcs_shutdown_device,
2417 .prepare = lcs_prepare,
2418 .complete = lcs_complete,
2419 .freeze = lcs_freeze,
2420 .thaw = lcs_thaw,
2421 .restore = lcs_restore,
2422 };
2423
2424 static ssize_t
2425 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2426 size_t count)
2427 {
2428 int err;
2429 err = ccwgroup_create_from_string(lcs_root_dev,
2430 lcs_group_driver.driver_id,
2431 &lcs_ccw_driver, 2, buf);
2432 return err ? err : count;
2433 }
2434
2435 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2436
2437 static struct attribute *lcs_group_attrs[] = {
2438 &driver_attr_group.attr,
2439 NULL,
2440 };
2441
2442 static struct attribute_group lcs_group_attr_group = {
2443 .attrs = lcs_group_attrs,
2444 };
2445
2446 static const struct attribute_group *lcs_group_attr_groups[] = {
2447 &lcs_group_attr_group,
2448 NULL,
2449 };
2450
2451 /**
2452 * LCS Module/Kernel initialization function
2453 */
2454 static int
2455 __init lcs_init_module(void)
2456 {
2457 int rc;
2458
2459 pr_info("Loading %s\n", version);
2460 rc = lcs_register_debug_facility();
2461 LCS_DBF_TEXT(0, setup, "lcsinit");
2462 if (rc)
2463 goto out_err;
2464 lcs_root_dev = root_device_register("lcs");
2465 rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2466 if (rc)
2467 goto register_err;
2468 rc = ccw_driver_register(&lcs_ccw_driver);
2469 if (rc)
2470 goto ccw_err;
2471 lcs_group_driver.driver.groups = lcs_group_attr_groups;
2472 rc = ccwgroup_driver_register(&lcs_group_driver);
2473 if (rc)
2474 goto ccwgroup_err;
2475 return 0;
2476
2477 ccwgroup_err:
2478 ccw_driver_unregister(&lcs_ccw_driver);
2479 ccw_err:
2480 root_device_unregister(lcs_root_dev);
2481 register_err:
2482 lcs_unregister_debug_facility();
2483 out_err:
2484 pr_err("Initializing the lcs device driver failed\n");
2485 return rc;
2486 }
2487
2488
2489 /**
2490 * LCS module cleanup function
2491 */
2492 static void
2493 __exit lcs_cleanup_module(void)
2494 {
2495 pr_info("Terminating lcs module.\n");
2496 LCS_DBF_TEXT(0, trace, "cleanup");
2497 driver_remove_file(&lcs_group_driver.driver,
2498 &driver_attr_group);
2499 ccwgroup_driver_unregister(&lcs_group_driver);
2500 ccw_driver_unregister(&lcs_ccw_driver);
2501 root_device_unregister(lcs_root_dev);
2502 lcs_unregister_debug_facility();
2503 }
2504
2505 module_init(lcs_init_module);
2506 module_exit(lcs_cleanup_module);
2507
2508 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2509 MODULE_LICENSE("GPL");
2510