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fanotify: do not return 0 in a void function
[linux-rapidio-2.6.git] / drivers / s390 / net / lcs.c
blob0f19d540b655be900be7e946fd0838c77d95bb03
1 /*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #define KMSG_COMPONENT "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/trdevice.h>
34 #include <linux/fddidevice.h>
35 #include <linux/inetdevice.h>
36 #include <linux/in.h>
37 #include <linux/igmp.h>
38 #include <linux/delay.h>
39 #include <linux/kthread.h>
40 #include <linux/slab.h>
41 #include <net/arp.h>
42 #include <net/ip.h>
43
44 #include <asm/debug.h>
45 #include <asm/idals.h>
46 #include <asm/timex.h>
47 #include <linux/device.h>
48 #include <asm/ccwgroup.h>
49
50 #include "lcs.h"
51
52
53 #if !defined(CONFIG_NET_ETHERNET) && \
54 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
55 #error Cannot compile lcs.c without some net devices switched on.
56 #endif
57
58 /**
59 * initialization string for output
60 */
61
62 static char version[] __initdata = "LCS driver";
63
64 /**
65 * the root device for lcs group devices
66 */
67 static struct device *lcs_root_dev;
68
69 /**
70 * Some prototypes.
71 */
72 static void lcs_tasklet(unsigned long);
73 static void lcs_start_kernel_thread(struct work_struct *);
74 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
75 #ifdef CONFIG_IP_MULTICAST
76 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
77 #endif /* CONFIG_IP_MULTICAST */
78 static int lcs_recovery(void *ptr);
79
80 /**
81 * Debug Facility Stuff
82 */
83 static char debug_buffer[255];
84 static debug_info_t *lcs_dbf_setup;
85 static debug_info_t *lcs_dbf_trace;
86
87 /**
88 * LCS Debug Facility functions
89 */
90 static void
91 lcs_unregister_debug_facility(void)
92 {
93 if (lcs_dbf_setup)
94 debug_unregister(lcs_dbf_setup);
95 if (lcs_dbf_trace)
96 debug_unregister(lcs_dbf_trace);
97 }
98
99 static int
100 lcs_register_debug_facility(void)
101 {
102 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
103 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
104 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
105 pr_err("Not enough memory for debug facility.\n");
106 lcs_unregister_debug_facility();
107 return -ENOMEM;
108 }
109 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
110 debug_set_level(lcs_dbf_setup, 2);
111 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
112 debug_set_level(lcs_dbf_trace, 2);
113 return 0;
114 }
115
116 /**
117 * Allocate io buffers.
118 */
119 static int
120 lcs_alloc_channel(struct lcs_channel *channel)
121 {
122 int cnt;
123
124 LCS_DBF_TEXT(2, setup, "ichalloc");
125 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
126 /* alloc memory fo iobuffer */
127 channel->iob[cnt].data =
128 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
129 if (channel->iob[cnt].data == NULL)
130 break;
131 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
132 }
133 if (cnt < LCS_NUM_BUFFS) {
134 /* Not all io buffers could be allocated. */
135 LCS_DBF_TEXT(2, setup, "echalloc");
136 while (cnt-- > 0)
137 kfree(channel->iob[cnt].data);
138 return -ENOMEM;
139 }
140 return 0;
141 }
142
143 /**
144 * Free io buffers.
145 */
146 static void
147 lcs_free_channel(struct lcs_channel *channel)
148 {
149 int cnt;
150
151 LCS_DBF_TEXT(2, setup, "ichfree");
152 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
153 kfree(channel->iob[cnt].data);
154 channel->iob[cnt].data = NULL;
155 }
156 }
157
158 /*
159 * Cleanup channel.
160 */
161 static void
162 lcs_cleanup_channel(struct lcs_channel *channel)
163 {
164 LCS_DBF_TEXT(3, setup, "cleanch");
165 /* Kill write channel tasklets. */
166 tasklet_kill(&channel->irq_tasklet);
167 /* Free channel buffers. */
168 lcs_free_channel(channel);
169 }
170
171 /**
172 * LCS free memory for card and channels.
173 */
174 static void
175 lcs_free_card(struct lcs_card *card)
176 {
177 LCS_DBF_TEXT(2, setup, "remcard");
178 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
179 kfree(card);
180 }
181
182 /**
183 * LCS alloc memory for card and channels
184 */
185 static struct lcs_card *
186 lcs_alloc_card(void)
187 {
188 struct lcs_card *card;
189 int rc;
190
191 LCS_DBF_TEXT(2, setup, "alloclcs");
192
193 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
194 if (card == NULL)
195 return NULL;
196 card->lan_type = LCS_FRAME_TYPE_AUTO;
197 card->pkt_seq = 0;
198 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
199 /* Allocate io buffers for the read channel. */
200 rc = lcs_alloc_channel(&card->read);
201 if (rc){
202 LCS_DBF_TEXT(2, setup, "iccwerr");
203 lcs_free_card(card);
204 return NULL;
205 }
206 /* Allocate io buffers for the write channel. */
207 rc = lcs_alloc_channel(&card->write);
208 if (rc) {
209 LCS_DBF_TEXT(2, setup, "iccwerr");
210 lcs_cleanup_channel(&card->read);
211 lcs_free_card(card);
212 return NULL;
213 }
214
215 #ifdef CONFIG_IP_MULTICAST
216 INIT_LIST_HEAD(&card->ipm_list);
217 #endif
218 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
219 return card;
220 }
221
222 /*
223 * Setup read channel.
224 */
225 static void
226 lcs_setup_read_ccws(struct lcs_card *card)
227 {
228 int cnt;
229
230 LCS_DBF_TEXT(2, setup, "ireadccw");
231 /* Setup read ccws. */
232 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
233 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
234 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
235 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
236 card->read.ccws[cnt].flags =
237 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
238 /*
239 * Note: we have allocated the buffer with GFP_DMA, so
240 * we do not need to do set_normalized_cda.
241 */
242 card->read.ccws[cnt].cda =
243 (__u32) __pa(card->read.iob[cnt].data);
244 ((struct lcs_header *)
245 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
246 card->read.iob[cnt].callback = lcs_get_frames_cb;
247 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
248 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
249 }
250 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
251 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
252 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
253 /* Last ccw is a tic (transfer in channel). */
254 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
255 card->read.ccws[LCS_NUM_BUFFS].cda =
256 (__u32) __pa(card->read.ccws);
257 /* Setg initial state of the read channel. */
258 card->read.state = LCS_CH_STATE_INIT;
259
260 card->read.io_idx = 0;
261 card->read.buf_idx = 0;
262 }
263
264 static void
265 lcs_setup_read(struct lcs_card *card)
266 {
267 LCS_DBF_TEXT(3, setup, "initread");
268
269 lcs_setup_read_ccws(card);
270 /* Initialize read channel tasklet. */
271 card->read.irq_tasklet.data = (unsigned long) &card->read;
272 card->read.irq_tasklet.func = lcs_tasklet;
273 /* Initialize waitqueue. */
274 init_waitqueue_head(&card->read.wait_q);
275 }
276
277 /*
278 * Setup write channel.
279 */
280 static void
281 lcs_setup_write_ccws(struct lcs_card *card)
282 {
283 int cnt;
284
285 LCS_DBF_TEXT(3, setup, "iwritccw");
286 /* Setup write ccws. */
287 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
288 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
289 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
290 card->write.ccws[cnt].count = 0;
291 card->write.ccws[cnt].flags =
292 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
293 /*
294 * Note: we have allocated the buffer with GFP_DMA, so
295 * we do not need to do set_normalized_cda.
296 */
297 card->write.ccws[cnt].cda =
298 (__u32) __pa(card->write.iob[cnt].data);
299 }
300 /* Last ccw is a tic (transfer in channel). */
301 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
302 card->write.ccws[LCS_NUM_BUFFS].cda =
303 (__u32) __pa(card->write.ccws);
304 /* Set initial state of the write channel. */
305 card->read.state = LCS_CH_STATE_INIT;
306
307 card->write.io_idx = 0;
308 card->write.buf_idx = 0;
309 }
310
311 static void
312 lcs_setup_write(struct lcs_card *card)
313 {
314 LCS_DBF_TEXT(3, setup, "initwrit");
315
316 lcs_setup_write_ccws(card);
317 /* Initialize write channel tasklet. */
318 card->write.irq_tasklet.data = (unsigned long) &card->write;
319 card->write.irq_tasklet.func = lcs_tasklet;
320 /* Initialize waitqueue. */
321 init_waitqueue_head(&card->write.wait_q);
322 }
323
324 static void
325 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
326 {
327 unsigned long flags;
328
329 spin_lock_irqsave(&card->mask_lock, flags);
330 card->thread_allowed_mask = threads;
331 spin_unlock_irqrestore(&card->mask_lock, flags);
332 wake_up(&card->wait_q);
333 }
334 static inline int
335 lcs_threads_running(struct lcs_card *card, unsigned long threads)
336 {
337 unsigned long flags;
338 int rc = 0;
339
340 spin_lock_irqsave(&card->mask_lock, flags);
341 rc = (card->thread_running_mask & threads);
342 spin_unlock_irqrestore(&card->mask_lock, flags);
343 return rc;
344 }
345
346 static int
347 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
348 {
349 return wait_event_interruptible(card->wait_q,
350 lcs_threads_running(card, threads) == 0);
351 }
352
353 static inline int
354 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
355 {
356 unsigned long flags;
357
358 spin_lock_irqsave(&card->mask_lock, flags);
359 if ( !(card->thread_allowed_mask & thread) ||
360 (card->thread_start_mask & thread) ) {
361 spin_unlock_irqrestore(&card->mask_lock, flags);
362 return -EPERM;
363 }
364 card->thread_start_mask |= thread;
365 spin_unlock_irqrestore(&card->mask_lock, flags);
366 return 0;
367 }
368
369 static void
370 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
371 {
372 unsigned long flags;
373
374 spin_lock_irqsave(&card->mask_lock, flags);
375 card->thread_running_mask &= ~thread;
376 spin_unlock_irqrestore(&card->mask_lock, flags);
377 wake_up(&card->wait_q);
378 }
379
380 static inline int
381 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
382 {
383 unsigned long flags;
384 int rc = 0;
385
386 spin_lock_irqsave(&card->mask_lock, flags);
387 if (card->thread_start_mask & thread){
388 if ((card->thread_allowed_mask & thread) &&
389 !(card->thread_running_mask & thread)){
390 rc = 1;
391 card->thread_start_mask &= ~thread;
392 card->thread_running_mask |= thread;
393 } else
394 rc = -EPERM;
395 }
396 spin_unlock_irqrestore(&card->mask_lock, flags);
397 return rc;
398 }
399
400 static int
401 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
402 {
403 int rc = 0;
404 wait_event(card->wait_q,
405 (rc = __lcs_do_run_thread(card, thread)) >= 0);
406 return rc;
407 }
408
409 static int
410 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
411 {
412 unsigned long flags;
413 int rc = 0;
414
415 spin_lock_irqsave(&card->mask_lock, flags);
416 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
417 (u8) card->thread_start_mask,
418 (u8) card->thread_allowed_mask,
419 (u8) card->thread_running_mask);
420 rc = (card->thread_start_mask & thread);
421 spin_unlock_irqrestore(&card->mask_lock, flags);
422 return rc;
423 }
424
425 /**
426 * Initialize channels,card and state machines.
427 */
428 static void
429 lcs_setup_card(struct lcs_card *card)
430 {
431 LCS_DBF_TEXT(2, setup, "initcard");
432 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
433
434 lcs_setup_read(card);
435 lcs_setup_write(card);
436 /* Set cards initial state. */
437 card->state = DEV_STATE_DOWN;
438 card->tx_buffer = NULL;
439 card->tx_emitted = 0;
440
441 init_waitqueue_head(&card->wait_q);
442 spin_lock_init(&card->lock);
443 spin_lock_init(&card->ipm_lock);
444 spin_lock_init(&card->mask_lock);
445 #ifdef CONFIG_IP_MULTICAST
446 INIT_LIST_HEAD(&card->ipm_list);
447 #endif
448 INIT_LIST_HEAD(&card->lancmd_waiters);
449 }
450
451 static inline void
452 lcs_clear_multicast_list(struct lcs_card *card)
453 {
454 #ifdef CONFIG_IP_MULTICAST
455 struct lcs_ipm_list *ipm;
456 unsigned long flags;
457
458 /* Free multicast list. */
459 LCS_DBF_TEXT(3, setup, "clmclist");
460 spin_lock_irqsave(&card->ipm_lock, flags);
461 while (!list_empty(&card->ipm_list)){
462 ipm = list_entry(card->ipm_list.next,
463 struct lcs_ipm_list, list);
464 list_del(&ipm->list);
465 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
466 spin_unlock_irqrestore(&card->ipm_lock, flags);
467 lcs_send_delipm(card, ipm);
468 spin_lock_irqsave(&card->ipm_lock, flags);
469 }
470 kfree(ipm);
471 }
472 spin_unlock_irqrestore(&card->ipm_lock, flags);
473 #endif
474 }
475 /**
476 * Cleanup channels,card and state machines.
477 */
478 static void
479 lcs_cleanup_card(struct lcs_card *card)
480 {
481
482 LCS_DBF_TEXT(3, setup, "cleancrd");
483 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
484
485 if (card->dev != NULL)
486 free_netdev(card->dev);
487 /* Cleanup channels. */
488 lcs_cleanup_channel(&card->write);
489 lcs_cleanup_channel(&card->read);
490 }
491
492 /**
493 * Start channel.
494 */
495 static int
496 lcs_start_channel(struct lcs_channel *channel)
497 {
498 unsigned long flags;
499 int rc;
500
501 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
502 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
503 rc = ccw_device_start(channel->ccwdev,
504 channel->ccws + channel->io_idx, 0, 0,
505 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
506 if (rc == 0)
507 channel->state = LCS_CH_STATE_RUNNING;
508 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
509 if (rc) {
510 LCS_DBF_TEXT_(4,trace,"essh%s",
511 dev_name(&channel->ccwdev->dev));
512 dev_err(&channel->ccwdev->dev,
513 "Starting an LCS device resulted in an error,"
514 " rc=%d!\n", rc);
515 }
516 return rc;
517 }
518
519 static int
520 lcs_clear_channel(struct lcs_channel *channel)
521 {
522 unsigned long flags;
523 int rc;
524
525 LCS_DBF_TEXT(4,trace,"clearch");
526 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
527 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
528 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
529 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
530 if (rc) {
531 LCS_DBF_TEXT_(4, trace, "ecsc%s",
532 dev_name(&channel->ccwdev->dev));
533 return rc;
534 }
535 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
536 channel->state = LCS_CH_STATE_STOPPED;
537 return rc;
538 }
539
540
541 /**
542 * Stop channel.
543 */
544 static int
545 lcs_stop_channel(struct lcs_channel *channel)
546 {
547 unsigned long flags;
548 int rc;
549
550 if (channel->state == LCS_CH_STATE_STOPPED)
551 return 0;
552 LCS_DBF_TEXT(4,trace,"haltsch");
553 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
554 channel->state = LCS_CH_STATE_INIT;
555 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
556 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
557 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
558 if (rc) {
559 LCS_DBF_TEXT_(4, trace, "ehsc%s",
560 dev_name(&channel->ccwdev->dev));
561 return rc;
562 }
563 /* Asynchronous halt initialted. Wait for its completion. */
564 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
565 lcs_clear_channel(channel);
566 return 0;
567 }
568
569 /**
570 * start read and write channel
571 */
572 static int
573 lcs_start_channels(struct lcs_card *card)
574 {
575 int rc;
576
577 LCS_DBF_TEXT(2, trace, "chstart");
578 /* start read channel */
579 rc = lcs_start_channel(&card->read);
580 if (rc)
581 return rc;
582 /* start write channel */
583 rc = lcs_start_channel(&card->write);
584 if (rc)
585 lcs_stop_channel(&card->read);
586 return rc;
587 }
588
589 /**
590 * stop read and write channel
591 */
592 static int
593 lcs_stop_channels(struct lcs_card *card)
594 {
595 LCS_DBF_TEXT(2, trace, "chhalt");
596 lcs_stop_channel(&card->read);
597 lcs_stop_channel(&card->write);
598 return 0;
599 }
600
601 /**
602 * Get empty buffer.
603 */
604 static struct lcs_buffer *
605 __lcs_get_buffer(struct lcs_channel *channel)
606 {
607 int index;
608
609 LCS_DBF_TEXT(5, trace, "_getbuff");
610 index = channel->io_idx;
611 do {
612 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
613 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
614 return channel->iob + index;
615 }
616 index = (index + 1) & (LCS_NUM_BUFFS - 1);
617 } while (index != channel->io_idx);
618 return NULL;
619 }
620
621 static struct lcs_buffer *
622 lcs_get_buffer(struct lcs_channel *channel)
623 {
624 struct lcs_buffer *buffer;
625 unsigned long flags;
626
627 LCS_DBF_TEXT(5, trace, "getbuff");
628 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
629 buffer = __lcs_get_buffer(channel);
630 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
631 return buffer;
632 }
633
634 /**
635 * Resume channel program if the channel is suspended.
636 */
637 static int
638 __lcs_resume_channel(struct lcs_channel *channel)
639 {
640 int rc;
641
642 if (channel->state != LCS_CH_STATE_SUSPENDED)
643 return 0;
644 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
645 return 0;
646 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
647 rc = ccw_device_resume(channel->ccwdev);
648 if (rc) {
649 LCS_DBF_TEXT_(4, trace, "ersc%s",
650 dev_name(&channel->ccwdev->dev));
651 dev_err(&channel->ccwdev->dev,
652 "Sending data from the LCS device to the LAN failed"
653 " with rc=%d\n",rc);
654 } else
655 channel->state = LCS_CH_STATE_RUNNING;
656 return rc;
657
658 }
659
660 /**
661 * Make a buffer ready for processing.
662 */
663 static inline void
664 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
665 {
666 int prev, next;
667
668 LCS_DBF_TEXT(5, trace, "rdybits");
669 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
670 next = (index + 1) & (LCS_NUM_BUFFS - 1);
671 /* Check if we may clear the suspend bit of this buffer. */
672 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
673 /* Check if we have to set the PCI bit. */
674 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
675 /* Suspend bit of the previous buffer is not set. */
676 channel->ccws[index].flags |= CCW_FLAG_PCI;
677 /* Suspend bit of the next buffer is set. */
678 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
679 }
680 }
681
682 static int
683 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
684 {
685 unsigned long flags;
686 int index, rc;
687
688 LCS_DBF_TEXT(5, trace, "rdybuff");
689 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
690 buffer->state != LCS_BUF_STATE_PROCESSED);
691 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
692 buffer->state = LCS_BUF_STATE_READY;
693 index = buffer - channel->iob;
694 /* Set length. */
695 channel->ccws[index].count = buffer->count;
696 /* Check relevant PCI/suspend bits. */
697 __lcs_ready_buffer_bits(channel, index);
698 rc = __lcs_resume_channel(channel);
699 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
700 return rc;
701 }
702
703 /**
704 * Mark the buffer as processed. Take care of the suspend bit
705 * of the previous buffer. This function is called from
706 * interrupt context, so the lock must not be taken.
707 */
708 static int
709 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
710 {
711 int index, prev, next;
712
713 LCS_DBF_TEXT(5, trace, "prcsbuff");
714 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
715 buffer->state = LCS_BUF_STATE_PROCESSED;
716 index = buffer - channel->iob;
717 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
718 next = (index + 1) & (LCS_NUM_BUFFS - 1);
719 /* Set the suspend bit and clear the PCI bit of this buffer. */
720 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
721 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
722 /* Check the suspend bit of the previous buffer. */
723 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
724 /*
725 * Previous buffer is in state ready. It might have
726 * happened in lcs_ready_buffer that the suspend bit
727 * has not been cleared to avoid an endless loop.
728 * Do it now.
729 */
730 __lcs_ready_buffer_bits(channel, prev);
731 }
732 /* Clear PCI bit of next buffer. */
733 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
734 return __lcs_resume_channel(channel);
735 }
736
737 /**
738 * Put a processed buffer back to state empty.
739 */
740 static void
741 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
742 {
743 unsigned long flags;
744
745 LCS_DBF_TEXT(5, trace, "relbuff");
746 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
747 buffer->state != LCS_BUF_STATE_PROCESSED);
748 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
749 buffer->state = LCS_BUF_STATE_EMPTY;
750 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
751 }
752
753 /**
754 * Get buffer for a lan command.
755 */
756 static struct lcs_buffer *
757 lcs_get_lancmd(struct lcs_card *card, int count)
758 {
759 struct lcs_buffer *buffer;
760 struct lcs_cmd *cmd;
761
762 LCS_DBF_TEXT(4, trace, "getlncmd");
763 /* Get buffer and wait if none is available. */
764 wait_event(card->write.wait_q,
765 ((buffer = lcs_get_buffer(&card->write)) != NULL));
766 count += sizeof(struct lcs_header);
767 *(__u16 *)(buffer->data + count) = 0;
768 buffer->count = count + sizeof(__u16);
769 buffer->callback = lcs_release_buffer;
770 cmd = (struct lcs_cmd *) buffer->data;
771 cmd->offset = count;
772 cmd->type = LCS_FRAME_TYPE_CONTROL;
773 cmd->slot = 0;
774 return buffer;
775 }
776
777
778 static void
779 lcs_get_reply(struct lcs_reply *reply)
780 {
781 WARN_ON(atomic_read(&reply->refcnt) <= 0);
782 atomic_inc(&reply->refcnt);
783 }
784
785 static void
786 lcs_put_reply(struct lcs_reply *reply)
787 {
788 WARN_ON(atomic_read(&reply->refcnt) <= 0);
789 if (atomic_dec_and_test(&reply->refcnt)) {
790 kfree(reply);
791 }
792
793 }
794
795 static struct lcs_reply *
796 lcs_alloc_reply(struct lcs_cmd *cmd)
797 {
798 struct lcs_reply *reply;
799
800 LCS_DBF_TEXT(4, trace, "getreply");
801
802 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
803 if (!reply)
804 return NULL;
805 atomic_set(&reply->refcnt,1);
806 reply->sequence_no = cmd->sequence_no;
807 reply->received = 0;
808 reply->rc = 0;
809 init_waitqueue_head(&reply->wait_q);
810
811 return reply;
812 }
813
814 /**
815 * Notifier function for lancmd replies. Called from read irq.
816 */
817 static void
818 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
819 {
820 struct list_head *l, *n;
821 struct lcs_reply *reply;
822
823 LCS_DBF_TEXT(4, trace, "notiwait");
824 spin_lock(&card->lock);
825 list_for_each_safe(l, n, &card->lancmd_waiters) {
826 reply = list_entry(l, struct lcs_reply, list);
827 if (reply->sequence_no == cmd->sequence_no) {
828 lcs_get_reply(reply);
829 list_del_init(&reply->list);
830 if (reply->callback != NULL)
831 reply->callback(card, cmd);
832 reply->received = 1;
833 reply->rc = cmd->return_code;
834 wake_up(&reply->wait_q);
835 lcs_put_reply(reply);
836 break;
837 }
838 }
839 spin_unlock(&card->lock);
840 }
841
842 /**
843 * Emit buffer of a lan comand.
844 */
845 static void
846 lcs_lancmd_timeout(unsigned long data)
847 {
848 struct lcs_reply *reply, *list_reply, *r;
849 unsigned long flags;
850
851 LCS_DBF_TEXT(4, trace, "timeout");
852 reply = (struct lcs_reply *) data;
853 spin_lock_irqsave(&reply->card->lock, flags);
854 list_for_each_entry_safe(list_reply, r,
855 &reply->card->lancmd_waiters,list) {
856 if (reply == list_reply) {
857 lcs_get_reply(reply);
858 list_del_init(&reply->list);
859 spin_unlock_irqrestore(&reply->card->lock, flags);
860 reply->received = 1;
861 reply->rc = -ETIME;
862 wake_up(&reply->wait_q);
863 lcs_put_reply(reply);
864 return;
865 }
866 }
867 spin_unlock_irqrestore(&reply->card->lock, flags);
868 }
869
870 static int
871 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
872 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
873 {
874 struct lcs_reply *reply;
875 struct lcs_cmd *cmd;
876 struct timer_list timer;
877 unsigned long flags;
878 int rc;
879
880 LCS_DBF_TEXT(4, trace, "sendcmd");
881 cmd = (struct lcs_cmd *) buffer->data;
882 cmd->return_code = 0;
883 cmd->sequence_no = card->sequence_no++;
884 reply = lcs_alloc_reply(cmd);
885 if (!reply)
886 return -ENOMEM;
887 reply->callback = reply_callback;
888 reply->card = card;
889 spin_lock_irqsave(&card->lock, flags);
890 list_add_tail(&reply->list, &card->lancmd_waiters);
891 spin_unlock_irqrestore(&card->lock, flags);
892
893 buffer->callback = lcs_release_buffer;
894 rc = lcs_ready_buffer(&card->write, buffer);
895 if (rc)
896 return rc;
897 init_timer_on_stack(&timer);
898 timer.function = lcs_lancmd_timeout;
899 timer.data = (unsigned long) reply;
900 timer.expires = jiffies + HZ*card->lancmd_timeout;
901 add_timer(&timer);
902 wait_event(reply->wait_q, reply->received);
903 del_timer_sync(&timer);
904 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
905 rc = reply->rc;
906 lcs_put_reply(reply);
907 return rc ? -EIO : 0;
908 }
909
910 /**
911 * LCS startup command
912 */
913 static int
914 lcs_send_startup(struct lcs_card *card, __u8 initiator)
915 {
916 struct lcs_buffer *buffer;
917 struct lcs_cmd *cmd;
918
919 LCS_DBF_TEXT(2, trace, "startup");
920 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
921 cmd = (struct lcs_cmd *) buffer->data;
922 cmd->cmd_code = LCS_CMD_STARTUP;
923 cmd->initiator = initiator;
924 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
925 return lcs_send_lancmd(card, buffer, NULL);
926 }
927
928 /**
929 * LCS shutdown command
930 */
931 static int
932 lcs_send_shutdown(struct lcs_card *card)
933 {
934 struct lcs_buffer *buffer;
935 struct lcs_cmd *cmd;
936
937 LCS_DBF_TEXT(2, trace, "shutdown");
938 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
939 cmd = (struct lcs_cmd *) buffer->data;
940 cmd->cmd_code = LCS_CMD_SHUTDOWN;
941 cmd->initiator = LCS_INITIATOR_TCPIP;
942 return lcs_send_lancmd(card, buffer, NULL);
943 }
944
945 /**
946 * LCS lanstat command
947 */
948 static void
949 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
950 {
951 LCS_DBF_TEXT(2, trace, "statcb");
952 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
953 }
954
955 static int
956 lcs_send_lanstat(struct lcs_card *card)
957 {
958 struct lcs_buffer *buffer;
959 struct lcs_cmd *cmd;
960
961 LCS_DBF_TEXT(2,trace, "cmdstat");
962 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
963 cmd = (struct lcs_cmd *) buffer->data;
964 /* Setup lanstat command. */
965 cmd->cmd_code = LCS_CMD_LANSTAT;
966 cmd->initiator = LCS_INITIATOR_TCPIP;
967 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
968 cmd->cmd.lcs_std_cmd.portno = card->portno;
969 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
970 }
971
972 /**
973 * send stoplan command
974 */
975 static int
976 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
977 {
978 struct lcs_buffer *buffer;
979 struct lcs_cmd *cmd;
980
981 LCS_DBF_TEXT(2, trace, "cmdstpln");
982 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
983 cmd = (struct lcs_cmd *) buffer->data;
984 cmd->cmd_code = LCS_CMD_STOPLAN;
985 cmd->initiator = initiator;
986 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
987 cmd->cmd.lcs_std_cmd.portno = card->portno;
988 return lcs_send_lancmd(card, buffer, NULL);
989 }
990
991 /**
992 * send startlan command
993 */
994 static void
995 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
996 {
997 LCS_DBF_TEXT(2, trace, "srtlancb");
998 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
999 card->portno = cmd->cmd.lcs_std_cmd.portno;
1000 }
1001
1002 static int
1003 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1004 {
1005 struct lcs_buffer *buffer;
1006 struct lcs_cmd *cmd;
1007
1008 LCS_DBF_TEXT(2, trace, "cmdstaln");
1009 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1010 cmd = (struct lcs_cmd *) buffer->data;
1011 cmd->cmd_code = LCS_CMD_STARTLAN;
1012 cmd->initiator = initiator;
1013 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1014 cmd->cmd.lcs_std_cmd.portno = card->portno;
1015 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1016 }
1017
1018 #ifdef CONFIG_IP_MULTICAST
1019 /**
1020 * send setipm command (Multicast)
1021 */
1022 static int
1023 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1024 {
1025 struct lcs_buffer *buffer;
1026 struct lcs_cmd *cmd;
1027
1028 LCS_DBF_TEXT(2, trace, "cmdsetim");
1029 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1030 cmd = (struct lcs_cmd *) buffer->data;
1031 cmd->cmd_code = LCS_CMD_SETIPM;
1032 cmd->initiator = LCS_INITIATOR_TCPIP;
1033 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1034 cmd->cmd.lcs_qipassist.portno = card->portno;
1035 cmd->cmd.lcs_qipassist.version = 4;
1036 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1037 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1038 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1039 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1040 return lcs_send_lancmd(card, buffer, NULL);
1041 }
1042
1043 /**
1044 * send delipm command (Multicast)
1045 */
1046 static int
1047 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1048 {
1049 struct lcs_buffer *buffer;
1050 struct lcs_cmd *cmd;
1051
1052 LCS_DBF_TEXT(2, trace, "cmddelim");
1053 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1054 cmd = (struct lcs_cmd *) buffer->data;
1055 cmd->cmd_code = LCS_CMD_DELIPM;
1056 cmd->initiator = LCS_INITIATOR_TCPIP;
1057 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058 cmd->cmd.lcs_qipassist.portno = card->portno;
1059 cmd->cmd.lcs_qipassist.version = 4;
1060 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1062 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1063 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1064 return lcs_send_lancmd(card, buffer, NULL);
1065 }
1066
1067 /**
1068 * check if multicast is supported by LCS
1069 */
1070 static void
1071 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1072 {
1073 LCS_DBF_TEXT(2, trace, "chkmccb");
1074 card->ip_assists_supported =
1075 cmd->cmd.lcs_qipassist.ip_assists_supported;
1076 card->ip_assists_enabled =
1077 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1078 }
1079
1080 static int
1081 lcs_check_multicast_support(struct lcs_card *card)
1082 {
1083 struct lcs_buffer *buffer;
1084 struct lcs_cmd *cmd;
1085 int rc;
1086
1087 LCS_DBF_TEXT(2, trace, "cmdqipa");
1088 /* Send query ipassist. */
1089 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1090 cmd = (struct lcs_cmd *) buffer->data;
1091 cmd->cmd_code = LCS_CMD_QIPASSIST;
1092 cmd->initiator = LCS_INITIATOR_TCPIP;
1093 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1094 cmd->cmd.lcs_qipassist.portno = card->portno;
1095 cmd->cmd.lcs_qipassist.version = 4;
1096 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1097 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1098 if (rc != 0) {
1099 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1100 return -EOPNOTSUPP;
1101 }
1102 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1103 return 0;
1104 return -EOPNOTSUPP;
1105 }
1106
1107 /**
1108 * set or del multicast address on LCS card
1109 */
1110 static void
1111 lcs_fix_multicast_list(struct lcs_card *card)
1112 {
1113 struct list_head failed_list;
1114 struct lcs_ipm_list *ipm, *tmp;
1115 unsigned long flags;
1116 int rc;
1117
1118 LCS_DBF_TEXT(4,trace, "fixipm");
1119 INIT_LIST_HEAD(&failed_list);
1120 spin_lock_irqsave(&card->ipm_lock, flags);
1121 list_modified:
1122 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1123 switch (ipm->ipm_state) {
1124 case LCS_IPM_STATE_SET_REQUIRED:
1125 /* del from ipm_list so noone else can tamper with
1126 * this entry */
1127 list_del_init(&ipm->list);
1128 spin_unlock_irqrestore(&card->ipm_lock, flags);
1129 rc = lcs_send_setipm(card, ipm);
1130 spin_lock_irqsave(&card->ipm_lock, flags);
1131 if (rc) {
1132 pr_info("Adding multicast address failed."
1133 " Table possibly full!\n");
1134 /* store ipm in failed list -> will be added
1135 * to ipm_list again, so a retry will be done
1136 * during the next call of this function */
1137 list_add_tail(&ipm->list, &failed_list);
1138 } else {
1139 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1140 /* re-insert into ipm_list */
1141 list_add_tail(&ipm->list, &card->ipm_list);
1142 }
1143 goto list_modified;
1144 case LCS_IPM_STATE_DEL_REQUIRED:
1145 list_del(&ipm->list);
1146 spin_unlock_irqrestore(&card->ipm_lock, flags);
1147 lcs_send_delipm(card, ipm);
1148 spin_lock_irqsave(&card->ipm_lock, flags);
1149 kfree(ipm);
1150 goto list_modified;
1151 case LCS_IPM_STATE_ON_CARD:
1152 break;
1153 }
1154 }
1155 /* re-insert all entries from the failed_list into ipm_list */
1156 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1157 list_move_tail(&ipm->list, &card->ipm_list);
1158
1159 spin_unlock_irqrestore(&card->ipm_lock, flags);
1160 }
1161
1162 /**
1163 * get mac address for the relevant Multicast address
1164 */
1165 static void
1166 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1167 {
1168 LCS_DBF_TEXT(4,trace, "getmac");
1169 if (dev->type == ARPHRD_IEEE802_TR)
1170 ip_tr_mc_map(ipm, mac);
1171 else
1172 ip_eth_mc_map(ipm, mac);
1173 }
1174
1175 /**
1176 * function called by net device to handle multicast address relevant things
1177 */
1178 static inline void
1179 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1180 {
1181 struct ip_mc_list *im4;
1182 struct list_head *l;
1183 struct lcs_ipm_list *ipm;
1184 unsigned long flags;
1185 char buf[MAX_ADDR_LEN];
1186
1187 LCS_DBF_TEXT(4, trace, "remmclst");
1188 spin_lock_irqsave(&card->ipm_lock, flags);
1189 list_for_each(l, &card->ipm_list) {
1190 ipm = list_entry(l, struct lcs_ipm_list, list);
1191 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1192 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1193 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1194 (memcmp(buf, &ipm->ipm.mac_addr,
1195 LCS_MAC_LENGTH) == 0) )
1196 break;
1197 }
1198 if (im4 == NULL)
1199 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1200 }
1201 spin_unlock_irqrestore(&card->ipm_lock, flags);
1202 }
1203
1204 static inline struct lcs_ipm_list *
1205 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1206 {
1207 struct lcs_ipm_list *tmp, *ipm = NULL;
1208 struct list_head *l;
1209 unsigned long flags;
1210
1211 LCS_DBF_TEXT(4, trace, "chkmcent");
1212 spin_lock_irqsave(&card->ipm_lock, flags);
1213 list_for_each(l, &card->ipm_list) {
1214 tmp = list_entry(l, struct lcs_ipm_list, list);
1215 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1216 (memcmp(buf, &tmp->ipm.mac_addr,
1217 LCS_MAC_LENGTH) == 0) ) {
1218 ipm = tmp;
1219 break;
1220 }
1221 }
1222 spin_unlock_irqrestore(&card->ipm_lock, flags);
1223 return ipm;
1224 }
1225
1226 static inline void
1227 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1228 {
1229
1230 struct ip_mc_list *im4;
1231 struct lcs_ipm_list *ipm;
1232 char buf[MAX_ADDR_LEN];
1233 unsigned long flags;
1234
1235 LCS_DBF_TEXT(4, trace, "setmclst");
1236 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1237 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1238 ipm = lcs_check_addr_entry(card, im4, buf);
1239 if (ipm != NULL)
1240 continue; /* Address already in list. */
1241 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1242 if (ipm == NULL) {
1243 pr_info("Not enough memory to add"
1244 " new multicast entry!\n");
1245 break;
1246 }
1247 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1248 ipm->ipm.ip_addr = im4->multiaddr;
1249 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1250 spin_lock_irqsave(&card->ipm_lock, flags);
1251 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1252 list_add(&ipm->list, &card->ipm_list);
1253 spin_unlock_irqrestore(&card->ipm_lock, flags);
1254 }
1255 }
1256
1257 static int
1258 lcs_register_mc_addresses(void *data)
1259 {
1260 struct lcs_card *card;
1261 struct in_device *in4_dev;
1262
1263 card = (struct lcs_card *) data;
1264
1265 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1266 return 0;
1267 LCS_DBF_TEXT(4, trace, "regmulti");
1268
1269 in4_dev = in_dev_get(card->dev);
1270 if (in4_dev == NULL)
1271 goto out;
1272 read_lock(&in4_dev->mc_list_lock);
1273 lcs_remove_mc_addresses(card,in4_dev);
1274 lcs_set_mc_addresses(card, in4_dev);
1275 read_unlock(&in4_dev->mc_list_lock);
1276 in_dev_put(in4_dev);
1277
1278 netif_carrier_off(card->dev);
1279 netif_tx_disable(card->dev);
1280 wait_event(card->write.wait_q,
1281 (card->write.state != LCS_CH_STATE_RUNNING));
1282 lcs_fix_multicast_list(card);
1283 if (card->state == DEV_STATE_UP) {
1284 netif_carrier_on(card->dev);
1285 netif_wake_queue(card->dev);
1286 }
1287 out:
1288 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1289 return 0;
1290 }
1291 #endif /* CONFIG_IP_MULTICAST */
1292
1293 /**
1294 * function called by net device to
1295 * handle multicast address relevant things
1296 */
1297 static void
1298 lcs_set_multicast_list(struct net_device *dev)
1299 {
1300 #ifdef CONFIG_IP_MULTICAST
1301 struct lcs_card *card;
1302
1303 LCS_DBF_TEXT(4, trace, "setmulti");
1304 card = (struct lcs_card *) dev->ml_priv;
1305
1306 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1307 schedule_work(&card->kernel_thread_starter);
1308 #endif /* CONFIG_IP_MULTICAST */
1309 }
1310
1311 static long
1312 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1313 {
1314 if (!IS_ERR(irb))
1315 return 0;
1316
1317 switch (PTR_ERR(irb)) {
1318 case -EIO:
1319 dev_warn(&cdev->dev,
1320 "An I/O-error occurred on the LCS device\n");
1321 LCS_DBF_TEXT(2, trace, "ckirberr");
1322 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1323 break;
1324 case -ETIMEDOUT:
1325 dev_warn(&cdev->dev,
1326 "A command timed out on the LCS device\n");
1327 LCS_DBF_TEXT(2, trace, "ckirberr");
1328 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1329 break;
1330 default:
1331 dev_warn(&cdev->dev,
1332 "An error occurred on the LCS device, rc=%ld\n",
1333 PTR_ERR(irb));
1334 LCS_DBF_TEXT(2, trace, "ckirberr");
1335 LCS_DBF_TEXT(2, trace, " rc???");
1336 }
1337 return PTR_ERR(irb);
1338 }
1339
1340 static int
1341 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1342 {
1343 int dstat, cstat;
1344 char *sense;
1345
1346 sense = (char *) irb->ecw;
1347 cstat = irb->scsw.cmd.cstat;
1348 dstat = irb->scsw.cmd.dstat;
1349
1350 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1351 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1352 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1353 LCS_DBF_TEXT(2, trace, "CGENCHK");
1354 return 1;
1355 }
1356 if (dstat & DEV_STAT_UNIT_CHECK) {
1357 if (sense[LCS_SENSE_BYTE_1] &
1358 LCS_SENSE_RESETTING_EVENT) {
1359 LCS_DBF_TEXT(2, trace, "REVIND");
1360 return 1;
1361 }
1362 if (sense[LCS_SENSE_BYTE_0] &
1363 LCS_SENSE_CMD_REJECT) {
1364 LCS_DBF_TEXT(2, trace, "CMDREJ");
1365 return 0;
1366 }
1367 if ((!sense[LCS_SENSE_BYTE_0]) &&
1368 (!sense[LCS_SENSE_BYTE_1]) &&
1369 (!sense[LCS_SENSE_BYTE_2]) &&
1370 (!sense[LCS_SENSE_BYTE_3])) {
1371 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1372 return 0;
1373 }
1374 LCS_DBF_TEXT(2, trace, "DGENCHK");
1375 return 1;
1376 }
1377 return 0;
1378 }
1379
1380 static void
1381 lcs_schedule_recovery(struct lcs_card *card)
1382 {
1383 LCS_DBF_TEXT(2, trace, "startrec");
1384 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1385 schedule_work(&card->kernel_thread_starter);
1386 }
1387
1388 /**
1389 * IRQ Handler for LCS channels
1390 */
1391 static void
1392 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1393 {
1394 struct lcs_card *card;
1395 struct lcs_channel *channel;
1396 int rc, index;
1397 int cstat, dstat;
1398
1399 if (lcs_check_irb_error(cdev, irb))
1400 return;
1401
1402 card = CARD_FROM_DEV(cdev);
1403 if (card->read.ccwdev == cdev)
1404 channel = &card->read;
1405 else
1406 channel = &card->write;
1407
1408 cstat = irb->scsw.cmd.cstat;
1409 dstat = irb->scsw.cmd.dstat;
1410 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1411 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1412 irb->scsw.cmd.dstat);
1413 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1414 irb->scsw.cmd.actl);
1415
1416 /* Check for channel and device errors presented */
1417 rc = lcs_get_problem(cdev, irb);
1418 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1419 dev_warn(&cdev->dev,
1420 "The LCS device stopped because of an error,"
1421 " dstat=0x%X, cstat=0x%X \n",
1422 dstat, cstat);
1423 if (rc) {
1424 channel->state = LCS_CH_STATE_ERROR;
1425 }
1426 }
1427 if (channel->state == LCS_CH_STATE_ERROR) {
1428 lcs_schedule_recovery(card);
1429 wake_up(&card->wait_q);
1430 return;
1431 }
1432 /* How far in the ccw chain have we processed? */
1433 if ((channel->state != LCS_CH_STATE_INIT) &&
1434 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1435 (irb->scsw.cmd.cpa != 0)) {
1436 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1437 - channel->ccws;
1438 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1439 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1440 /* Bloody io subsystem tells us lies about cpa... */
1441 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1442 while (channel->io_idx != index) {
1443 __lcs_processed_buffer(channel,
1444 channel->iob + channel->io_idx);
1445 channel->io_idx =
1446 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1447 }
1448 }
1449
1450 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1451 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1452 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1453 /* Mark channel as stopped. */
1454 channel->state = LCS_CH_STATE_STOPPED;
1455 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1456 /* CCW execution stopped on a suspend bit. */
1457 channel->state = LCS_CH_STATE_SUSPENDED;
1458 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1459 if (irb->scsw.cmd.cc != 0) {
1460 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1461 return;
1462 }
1463 /* The channel has been stopped by halt_IO. */
1464 channel->state = LCS_CH_STATE_HALTED;
1465 }
1466 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1467 channel->state = LCS_CH_STATE_CLEARED;
1468 /* Do the rest in the tasklet. */
1469 tasklet_schedule(&channel->irq_tasklet);
1470 }
1471
1472 /**
1473 * Tasklet for IRQ handler
1474 */
1475 static void
1476 lcs_tasklet(unsigned long data)
1477 {
1478 unsigned long flags;
1479 struct lcs_channel *channel;
1480 struct lcs_buffer *iob;
1481 int buf_idx;
1482 int rc;
1483
1484 channel = (struct lcs_channel *) data;
1485 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1486
1487 /* Check for processed buffers. */
1488 iob = channel->iob;
1489 buf_idx = channel->buf_idx;
1490 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1491 /* Do the callback thing. */
1492 if (iob[buf_idx].callback != NULL)
1493 iob[buf_idx].callback(channel, iob + buf_idx);
1494 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1495 }
1496 channel->buf_idx = buf_idx;
1497
1498 if (channel->state == LCS_CH_STATE_STOPPED)
1499 // FIXME: what if rc != 0 ??
1500 rc = lcs_start_channel(channel);
1501 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1502 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1503 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1504 // FIXME: what if rc != 0 ??
1505 rc = __lcs_resume_channel(channel);
1506 }
1507 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1508
1509 /* Something happened on the channel. Wake up waiters. */
1510 wake_up(&channel->wait_q);
1511 }
1512
1513 /**
1514 * Finish current tx buffer and make it ready for transmit.
1515 */
1516 static void
1517 __lcs_emit_txbuffer(struct lcs_card *card)
1518 {
1519 LCS_DBF_TEXT(5, trace, "emittx");
1520 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1521 card->tx_buffer->count += 2;
1522 lcs_ready_buffer(&card->write, card->tx_buffer);
1523 card->tx_buffer = NULL;
1524 card->tx_emitted++;
1525 }
1526
1527 /**
1528 * Callback for finished tx buffers.
1529 */
1530 static void
1531 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1532 {
1533 struct lcs_card *card;
1534
1535 LCS_DBF_TEXT(5, trace, "txbuffcb");
1536 /* Put buffer back to pool. */
1537 lcs_release_buffer(channel, buffer);
1538 card = container_of(channel, struct lcs_card, write);
1539 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1540 netif_wake_queue(card->dev);
1541 spin_lock(&card->lock);
1542 card->tx_emitted--;
1543 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1544 /*
1545 * Last running tx buffer has finished. Submit partially
1546 * filled current buffer.
1547 */
1548 __lcs_emit_txbuffer(card);
1549 spin_unlock(&card->lock);
1550 }
1551
1552 /**
1553 * Packet transmit function called by network stack
1554 */
1555 static int
1556 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1557 struct net_device *dev)
1558 {
1559 struct lcs_header *header;
1560 int rc = NETDEV_TX_OK;
1561
1562 LCS_DBF_TEXT(5, trace, "hardxmit");
1563 if (skb == NULL) {
1564 card->stats.tx_dropped++;
1565 card->stats.tx_errors++;
1566 return NETDEV_TX_OK;
1567 }
1568 if (card->state != DEV_STATE_UP) {
1569 dev_kfree_skb(skb);
1570 card->stats.tx_dropped++;
1571 card->stats.tx_errors++;
1572 card->stats.tx_carrier_errors++;
1573 return NETDEV_TX_OK;
1574 }
1575 if (skb->protocol == htons(ETH_P_IPV6)) {
1576 dev_kfree_skb(skb);
1577 return NETDEV_TX_OK;
1578 }
1579 netif_stop_queue(card->dev);
1580 spin_lock(&card->lock);
1581 if (card->tx_buffer != NULL &&
1582 card->tx_buffer->count + sizeof(struct lcs_header) +
1583 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1584 /* skb too big for current tx buffer. */
1585 __lcs_emit_txbuffer(card);
1586 if (card->tx_buffer == NULL) {
1587 /* Get new tx buffer */
1588 card->tx_buffer = lcs_get_buffer(&card->write);
1589 if (card->tx_buffer == NULL) {
1590 card->stats.tx_dropped++;
1591 rc = NETDEV_TX_BUSY;
1592 goto out;
1593 }
1594 card->tx_buffer->callback = lcs_txbuffer_cb;
1595 card->tx_buffer->count = 0;
1596 }
1597 header = (struct lcs_header *)
1598 (card->tx_buffer->data + card->tx_buffer->count);
1599 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1600 header->offset = card->tx_buffer->count;
1601 header->type = card->lan_type;
1602 header->slot = card->portno;
1603 skb_copy_from_linear_data(skb, header + 1, skb->len);
1604 spin_unlock(&card->lock);
1605 card->stats.tx_bytes += skb->len;
1606 card->stats.tx_packets++;
1607 dev_kfree_skb(skb);
1608 netif_wake_queue(card->dev);
1609 spin_lock(&card->lock);
1610 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1611 /* If this is the first tx buffer emit it immediately. */
1612 __lcs_emit_txbuffer(card);
1613 out:
1614 spin_unlock(&card->lock);
1615 return rc;
1616 }
1617
1618 static int
1619 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1620 {
1621 struct lcs_card *card;
1622 int rc;
1623
1624 LCS_DBF_TEXT(5, trace, "pktxmit");
1625 card = (struct lcs_card *) dev->ml_priv;
1626 rc = __lcs_start_xmit(card, skb, dev);
1627 return rc;
1628 }
1629
1630 /**
1631 * send startlan and lanstat command to make LCS device ready
1632 */
1633 static int
1634 lcs_startlan_auto(struct lcs_card *card)
1635 {
1636 int rc;
1637
1638 LCS_DBF_TEXT(2, trace, "strtauto");
1639 #ifdef CONFIG_NET_ETHERNET
1640 card->lan_type = LCS_FRAME_TYPE_ENET;
1641 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642 if (rc == 0)
1643 return 0;
1644
1645 #endif
1646 #ifdef CONFIG_TR
1647 card->lan_type = LCS_FRAME_TYPE_TR;
1648 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1649 if (rc == 0)
1650 return 0;
1651 #endif
1652 #ifdef CONFIG_FDDI
1653 card->lan_type = LCS_FRAME_TYPE_FDDI;
1654 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1655 if (rc == 0)
1656 return 0;
1657 #endif
1658 return -EIO;
1659 }
1660
1661 static int
1662 lcs_startlan(struct lcs_card *card)
1663 {
1664 int rc, i;
1665
1666 LCS_DBF_TEXT(2, trace, "startlan");
1667 rc = 0;
1668 if (card->portno != LCS_INVALID_PORT_NO) {
1669 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1670 rc = lcs_startlan_auto(card);
1671 else
1672 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1673 } else {
1674 for (i = 0; i <= 16; i++) {
1675 card->portno = i;
1676 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1677 rc = lcs_send_startlan(card,
1678 LCS_INITIATOR_TCPIP);
1679 else
1680 /* autodetecting lan type */
1681 rc = lcs_startlan_auto(card);
1682 if (rc == 0)
1683 break;
1684 }
1685 }
1686 if (rc == 0)
1687 return lcs_send_lanstat(card);
1688 return rc;
1689 }
1690
1691 /**
1692 * LCS detect function
1693 * setup channels and make them I/O ready
1694 */
1695 static int
1696 lcs_detect(struct lcs_card *card)
1697 {
1698 int rc = 0;
1699
1700 LCS_DBF_TEXT(2, setup, "lcsdetct");
1701 /* start/reset card */
1702 if (card->dev)
1703 netif_stop_queue(card->dev);
1704 rc = lcs_stop_channels(card);
1705 if (rc == 0) {
1706 rc = lcs_start_channels(card);
1707 if (rc == 0) {
1708 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1709 if (rc == 0)
1710 rc = lcs_startlan(card);
1711 }
1712 }
1713 if (rc == 0) {
1714 card->state = DEV_STATE_UP;
1715 } else {
1716 card->state = DEV_STATE_DOWN;
1717 card->write.state = LCS_CH_STATE_INIT;
1718 card->read.state = LCS_CH_STATE_INIT;
1719 }
1720 return rc;
1721 }
1722
1723 /**
1724 * LCS Stop card
1725 */
1726 static int
1727 lcs_stopcard(struct lcs_card *card)
1728 {
1729 int rc;
1730
1731 LCS_DBF_TEXT(3, setup, "stopcard");
1732
1733 if (card->read.state != LCS_CH_STATE_STOPPED &&
1734 card->write.state != LCS_CH_STATE_STOPPED &&
1735 card->read.state != LCS_CH_STATE_ERROR &&
1736 card->write.state != LCS_CH_STATE_ERROR &&
1737 card->state == DEV_STATE_UP) {
1738 lcs_clear_multicast_list(card);
1739 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1740 rc = lcs_send_shutdown(card);
1741 }
1742 rc = lcs_stop_channels(card);
1743 card->state = DEV_STATE_DOWN;
1744
1745 return rc;
1746 }
1747
1748 /**
1749 * Kernel Thread helper functions for LGW initiated commands
1750 */
1751 static void
1752 lcs_start_kernel_thread(struct work_struct *work)
1753 {
1754 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1755 LCS_DBF_TEXT(5, trace, "krnthrd");
1756 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1757 kthread_run(lcs_recovery, card, "lcs_recover");
1758 #ifdef CONFIG_IP_MULTICAST
1759 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1760 kthread_run(lcs_register_mc_addresses, card, "regipm");
1761 #endif
1762 }
1763
1764 /**
1765 * Process control frames.
1766 */
1767 static void
1768 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1769 {
1770 LCS_DBF_TEXT(5, trace, "getctrl");
1771 if (cmd->initiator == LCS_INITIATOR_LGW) {
1772 switch(cmd->cmd_code) {
1773 case LCS_CMD_STARTUP:
1774 case LCS_CMD_STARTLAN:
1775 lcs_schedule_recovery(card);
1776 break;
1777 case LCS_CMD_STOPLAN:
1778 pr_warning("Stoplan for %s initiated by LGW.\n",
1779 card->dev->name);
1780 if (card->dev)
1781 netif_carrier_off(card->dev);
1782 break;
1783 default:
1784 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1785 break;
1786 }
1787 } else
1788 lcs_notify_lancmd_waiters(card, cmd);
1789 }
1790
1791 /**
1792 * Unpack network packet.
1793 */
1794 static void
1795 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1796 {
1797 struct sk_buff *skb;
1798
1799 LCS_DBF_TEXT(5, trace, "getskb");
1800 if (card->dev == NULL ||
1801 card->state != DEV_STATE_UP)
1802 /* The card isn't up. Ignore the packet. */
1803 return;
1804
1805 skb = dev_alloc_skb(skb_len);
1806 if (skb == NULL) {
1807 dev_err(&card->dev->dev,
1808 " Allocating a socket buffer to interface %s failed\n",
1809 card->dev->name);
1810 card->stats.rx_dropped++;
1811 return;
1812 }
1813 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1814 skb->protocol = card->lan_type_trans(skb, card->dev);
1815 card->stats.rx_bytes += skb_len;
1816 card->stats.rx_packets++;
1817 if (skb->protocol == htons(ETH_P_802_2))
1818 *((__u32 *)skb->cb) = ++card->pkt_seq;
1819 netif_rx(skb);
1820 }
1821
1822 /**
1823 * LCS main routine to get packets and lancmd replies from the buffers
1824 */
1825 static void
1826 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1827 {
1828 struct lcs_card *card;
1829 struct lcs_header *lcs_hdr;
1830 __u16 offset;
1831
1832 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1833 lcs_hdr = (struct lcs_header *) buffer->data;
1834 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1835 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1836 return;
1837 }
1838 card = container_of(channel, struct lcs_card, read);
1839 offset = 0;
1840 while (lcs_hdr->offset != 0) {
1841 if (lcs_hdr->offset <= 0 ||
1842 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1843 lcs_hdr->offset < offset) {
1844 /* Offset invalid. */
1845 card->stats.rx_length_errors++;
1846 card->stats.rx_errors++;
1847 return;
1848 }
1849 /* What kind of frame is it? */
1850 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1851 /* Control frame. */
1852 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1853 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1854 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1855 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1856 /* Normal network packet. */
1857 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1858 lcs_hdr->offset - offset -
1859 sizeof(struct lcs_header));
1860 else
1861 /* Unknown frame type. */
1862 ; // FIXME: error message ?
1863 /* Proceed to next frame. */
1864 offset = lcs_hdr->offset;
1865 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1866 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1867 }
1868 /* The buffer is now empty. Make it ready again. */
1869 lcs_ready_buffer(&card->read, buffer);
1870 }
1871
1872 /**
1873 * get network statistics for ifconfig and other user programs
1874 */
1875 static struct net_device_stats *
1876 lcs_getstats(struct net_device *dev)
1877 {
1878 struct lcs_card *card;
1879
1880 LCS_DBF_TEXT(4, trace, "netstats");
1881 card = (struct lcs_card *) dev->ml_priv;
1882 return &card->stats;
1883 }
1884
1885 /**
1886 * stop lcs device
1887 * This function will be called by user doing ifconfig xxx down
1888 */
1889 static int
1890 lcs_stop_device(struct net_device *dev)
1891 {
1892 struct lcs_card *card;
1893 int rc;
1894
1895 LCS_DBF_TEXT(2, trace, "stopdev");
1896 card = (struct lcs_card *) dev->ml_priv;
1897 netif_carrier_off(dev);
1898 netif_tx_disable(dev);
1899 dev->flags &= ~IFF_UP;
1900 wait_event(card->write.wait_q,
1901 (card->write.state != LCS_CH_STATE_RUNNING));
1902 rc = lcs_stopcard(card);
1903 if (rc)
1904 dev_err(&card->dev->dev,
1905 " Shutting down the LCS device failed\n ");
1906 return rc;
1907 }
1908
1909 /**
1910 * start lcs device and make it runnable
1911 * This function will be called by user doing ifconfig xxx up
1912 */
1913 static int
1914 lcs_open_device(struct net_device *dev)
1915 {
1916 struct lcs_card *card;
1917 int rc;
1918
1919 LCS_DBF_TEXT(2, trace, "opendev");
1920 card = (struct lcs_card *) dev->ml_priv;
1921 /* initialize statistics */
1922 rc = lcs_detect(card);
1923 if (rc) {
1924 pr_err("Error in opening device!\n");
1925
1926 } else {
1927 dev->flags |= IFF_UP;
1928 netif_carrier_on(dev);
1929 netif_wake_queue(dev);
1930 card->state = DEV_STATE_UP;
1931 }
1932 return rc;
1933 }
1934
1935 /**
1936 * show function for portno called by cat or similar things
1937 */
1938 static ssize_t
1939 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1940 {
1941 struct lcs_card *card;
1942
1943 card = dev_get_drvdata(dev);
1944
1945 if (!card)
1946 return 0;
1947
1948 return sprintf(buf, "%d\n", card->portno);
1949 }
1950
1951 /**
1952 * store the value which is piped to file portno
1953 */
1954 static ssize_t
1955 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1956 {
1957 struct lcs_card *card;
1958 int value;
1959
1960 card = dev_get_drvdata(dev);
1961
1962 if (!card)
1963 return 0;
1964
1965 sscanf(buf, "%u", &value);
1966 /* TODO: sanity checks */
1967 card->portno = value;
1968
1969 return count;
1970
1971 }
1972
1973 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1974
1975 const char *lcs_type[] = {
1976 "not a channel",
1977 "2216 parallel",
1978 "2216 channel",
1979 "OSA LCS card",
1980 "unknown channel type",
1981 "unsupported channel type",
1982 };
1983
1984 static ssize_t
1985 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1986 {
1987 struct ccwgroup_device *cgdev;
1988
1989 cgdev = to_ccwgroupdev(dev);
1990 if (!cgdev)
1991 return -ENODEV;
1992
1993 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1994 }
1995
1996 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1997
1998 static ssize_t
1999 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2000 {
2001 struct lcs_card *card;
2002
2003 card = dev_get_drvdata(dev);
2004
2005 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2006 }
2007
2008 static ssize_t
2009 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2010 {
2011 struct lcs_card *card;
2012 int value;
2013
2014 card = dev_get_drvdata(dev);
2015
2016 if (!card)
2017 return 0;
2018
2019 sscanf(buf, "%u", &value);
2020 /* TODO: sanity checks */
2021 card->lancmd_timeout = value;
2022
2023 return count;
2024
2025 }
2026
2027 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2028
2029 static ssize_t
2030 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2031 const char *buf, size_t count)
2032 {
2033 struct lcs_card *card = dev_get_drvdata(dev);
2034 char *tmp;
2035 int i;
2036
2037 if (!card)
2038 return -EINVAL;
2039 if (card->state != DEV_STATE_UP)
2040 return -EPERM;
2041 i = simple_strtoul(buf, &tmp, 16);
2042 if (i == 1)
2043 lcs_schedule_recovery(card);
2044 return count;
2045 }
2046
2047 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2048
2049 static struct attribute * lcs_attrs[] = {
2050 &dev_attr_portno.attr,
2051 &dev_attr_type.attr,
2052 &dev_attr_lancmd_timeout.attr,
2053 &dev_attr_recover.attr,
2054 NULL,
2055 };
2056
2057 static struct attribute_group lcs_attr_group = {
2058 .attrs = lcs_attrs,
2059 };
2060
2061 /**
2062 * lcs_probe_device is called on establishing a new ccwgroup_device.
2063 */
2064 static int
2065 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2066 {
2067 struct lcs_card *card;
2068 int ret;
2069
2070 if (!get_device(&ccwgdev->dev))
2071 return -ENODEV;
2072
2073 LCS_DBF_TEXT(2, setup, "add_dev");
2074 card = lcs_alloc_card();
2075 if (!card) {
2076 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2077 put_device(&ccwgdev->dev);
2078 return -ENOMEM;
2079 }
2080 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2081 if (ret) {
2082 lcs_free_card(card);
2083 put_device(&ccwgdev->dev);
2084 return ret;
2085 }
2086 dev_set_drvdata(&ccwgdev->dev, card);
2087 ccwgdev->cdev[0]->handler = lcs_irq;
2088 ccwgdev->cdev[1]->handler = lcs_irq;
2089 card->gdev = ccwgdev;
2090 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2091 card->thread_start_mask = 0;
2092 card->thread_allowed_mask = 0;
2093 card->thread_running_mask = 0;
2094 return 0;
2095 }
2096
2097 static int
2098 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2099 {
2100 struct lcs_card *card;
2101
2102 LCS_DBF_TEXT(2, setup, "regnetdv");
2103 card = dev_get_drvdata(&ccwgdev->dev);
2104 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2105 return 0;
2106 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2107 return register_netdev(card->dev);
2108 }
2109
2110 /**
2111 * lcs_new_device will be called by setting the group device online.
2112 */
2113 static const struct net_device_ops lcs_netdev_ops = {
2114 .ndo_open = lcs_open_device,
2115 .ndo_stop = lcs_stop_device,
2116 .ndo_get_stats = lcs_getstats,
2117 .ndo_start_xmit = lcs_start_xmit,
2118 };
2119
2120 static const struct net_device_ops lcs_mc_netdev_ops = {
2121 .ndo_open = lcs_open_device,
2122 .ndo_stop = lcs_stop_device,
2123 .ndo_get_stats = lcs_getstats,
2124 .ndo_start_xmit = lcs_start_xmit,
2125 .ndo_set_multicast_list = lcs_set_multicast_list,
2126 };
2127
2128 static int
2129 lcs_new_device(struct ccwgroup_device *ccwgdev)
2130 {
2131 struct lcs_card *card;
2132 struct net_device *dev=NULL;
2133 enum lcs_dev_states recover_state;
2134 int rc;
2135
2136 card = dev_get_drvdata(&ccwgdev->dev);
2137 if (!card)
2138 return -ENODEV;
2139
2140 LCS_DBF_TEXT(2, setup, "newdev");
2141 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2142 card->read.ccwdev = ccwgdev->cdev[0];
2143 card->write.ccwdev = ccwgdev->cdev[1];
2144
2145 recover_state = card->state;
2146 rc = ccw_device_set_online(card->read.ccwdev);
2147 if (rc)
2148 goto out_err;
2149 rc = ccw_device_set_online(card->write.ccwdev);
2150 if (rc)
2151 goto out_werr;
2152
2153 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2154
2155 lcs_setup_card(card);
2156 rc = lcs_detect(card);
2157 if (rc) {
2158 LCS_DBF_TEXT(2, setup, "dtctfail");
2159 dev_err(&card->dev->dev,
2160 "Detecting a network adapter for LCS devices"
2161 " failed with rc=%d (0x%x)\n", rc, rc);
2162 lcs_stopcard(card);
2163 goto out;
2164 }
2165 if (card->dev) {
2166 LCS_DBF_TEXT(2, setup, "samedev");
2167 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2168 goto netdev_out;
2169 }
2170 switch (card->lan_type) {
2171 #ifdef CONFIG_NET_ETHERNET
2172 case LCS_FRAME_TYPE_ENET:
2173 card->lan_type_trans = eth_type_trans;
2174 dev = alloc_etherdev(0);
2175 break;
2176 #endif
2177 #ifdef CONFIG_TR
2178 case LCS_FRAME_TYPE_TR:
2179 card->lan_type_trans = tr_type_trans;
2180 dev = alloc_trdev(0);
2181 break;
2182 #endif
2183 #ifdef CONFIG_FDDI
2184 case LCS_FRAME_TYPE_FDDI:
2185 card->lan_type_trans = fddi_type_trans;
2186 dev = alloc_fddidev(0);
2187 break;
2188 #endif
2189 default:
2190 LCS_DBF_TEXT(3, setup, "errinit");
2191 pr_err(" Initialization failed\n");
2192 goto out;
2193 }
2194 if (!dev)
2195 goto out;
2196 card->dev = dev;
2197 card->dev->ml_priv = card;
2198 card->dev->netdev_ops = &lcs_netdev_ops;
2199 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2200 #ifdef CONFIG_IP_MULTICAST
2201 if (!lcs_check_multicast_support(card))
2202 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2203 #endif
2204 netdev_out:
2205 lcs_set_allowed_threads(card,0xffffffff);
2206 if (recover_state == DEV_STATE_RECOVER) {
2207 lcs_set_multicast_list(card->dev);
2208 card->dev->flags |= IFF_UP;
2209 netif_carrier_on(card->dev);
2210 netif_wake_queue(card->dev);
2211 card->state = DEV_STATE_UP;
2212 } else {
2213 lcs_stopcard(card);
2214 }
2215
2216 if (lcs_register_netdev(ccwgdev) != 0)
2217 goto out;
2218
2219 /* Print out supported assists: IPv6 */
2220 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2221 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2222 "with" : "without");
2223 /* Print out supported assist: Multicast */
2224 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2225 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2226 "with" : "without");
2227 return 0;
2228 out:
2229
2230 ccw_device_set_offline(card->write.ccwdev);
2231 out_werr:
2232 ccw_device_set_offline(card->read.ccwdev);
2233 out_err:
2234 return -ENODEV;
2235 }
2236
2237 /**
2238 * lcs_shutdown_device, called when setting the group device offline.
2239 */
2240 static int
2241 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2242 {
2243 struct lcs_card *card;
2244 enum lcs_dev_states recover_state;
2245 int ret;
2246
2247 LCS_DBF_TEXT(3, setup, "shtdndev");
2248 card = dev_get_drvdata(&ccwgdev->dev);
2249 if (!card)
2250 return -ENODEV;
2251 if (recovery_mode == 0) {
2252 lcs_set_allowed_threads(card, 0);
2253 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2254 return -ERESTARTSYS;
2255 }
2256 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2257 recover_state = card->state;
2258
2259 ret = lcs_stop_device(card->dev);
2260 ret = ccw_device_set_offline(card->read.ccwdev);
2261 ret = ccw_device_set_offline(card->write.ccwdev);
2262 if (recover_state == DEV_STATE_UP) {
2263 card->state = DEV_STATE_RECOVER;
2264 }
2265 if (ret)
2266 return ret;
2267 return 0;
2268 }
2269
2270 static int
2271 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2272 {
2273 return __lcs_shutdown_device(ccwgdev, 0);
2274 }
2275
2276 /**
2277 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2278 */
2279 static int
2280 lcs_recovery(void *ptr)
2281 {
2282 struct lcs_card *card;
2283 struct ccwgroup_device *gdev;
2284 int rc;
2285
2286 card = (struct lcs_card *) ptr;
2287
2288 LCS_DBF_TEXT(4, trace, "recover1");
2289 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2290 return 0;
2291 LCS_DBF_TEXT(4, trace, "recover2");
2292 gdev = card->gdev;
2293 dev_warn(&gdev->dev,
2294 "A recovery process has been started for the LCS device\n");
2295 rc = __lcs_shutdown_device(gdev, 1);
2296 rc = lcs_new_device(gdev);
2297 if (!rc)
2298 pr_info("Device %s successfully recovered!\n",
2299 card->dev->name);
2300 else
2301 pr_info("Device %s could not be recovered!\n",
2302 card->dev->name);
2303 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2304 return 0;
2305 }
2306
2307 /**
2308 * lcs_remove_device, free buffers and card
2309 */
2310 static void
2311 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2312 {
2313 struct lcs_card *card;
2314
2315 card = dev_get_drvdata(&ccwgdev->dev);
2316 if (!card)
2317 return;
2318
2319 LCS_DBF_TEXT(3, setup, "remdev");
2320 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2321 if (ccwgdev->state == CCWGROUP_ONLINE) {
2322 lcs_shutdown_device(ccwgdev);
2323 }
2324 if (card->dev)
2325 unregister_netdev(card->dev);
2326 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2327 lcs_cleanup_card(card);
2328 lcs_free_card(card);
2329 put_device(&ccwgdev->dev);
2330 }
2331
2332 static int lcs_pm_suspend(struct lcs_card *card)
2333 {
2334 if (card->dev)
2335 netif_device_detach(card->dev);
2336 lcs_set_allowed_threads(card, 0);
2337 lcs_wait_for_threads(card, 0xffffffff);
2338 if (card->state != DEV_STATE_DOWN)
2339 __lcs_shutdown_device(card->gdev, 1);
2340 return 0;
2341 }
2342
2343 static int lcs_pm_resume(struct lcs_card *card)
2344 {
2345 int rc = 0;
2346
2347 if (card->state == DEV_STATE_RECOVER)
2348 rc = lcs_new_device(card->gdev);
2349 if (card->dev)
2350 netif_device_attach(card->dev);
2351 if (rc) {
2352 dev_warn(&card->gdev->dev, "The lcs device driver "
2353 "failed to recover the device\n");
2354 }
2355 return rc;
2356 }
2357
2358 static int lcs_prepare(struct ccwgroup_device *gdev)
2359 {
2360 return 0;
2361 }
2362
2363 static void lcs_complete(struct ccwgroup_device *gdev)
2364 {
2365 return;
2366 }
2367
2368 static int lcs_freeze(struct ccwgroup_device *gdev)
2369 {
2370 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2371 return lcs_pm_suspend(card);
2372 }
2373
2374 static int lcs_thaw(struct ccwgroup_device *gdev)
2375 {
2376 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2377 return lcs_pm_resume(card);
2378 }
2379
2380 static int lcs_restore(struct ccwgroup_device *gdev)
2381 {
2382 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2383 return lcs_pm_resume(card);
2384 }
2385
2386 static struct ccw_device_id lcs_ids[] = {
2387 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2388 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2389 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2390 {},
2391 };
2392 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2393
2394 static struct ccw_driver lcs_ccw_driver = {
2395 .owner = THIS_MODULE,
2396 .name = "lcs",
2397 .ids = lcs_ids,
2398 .probe = ccwgroup_probe_ccwdev,
2399 .remove = ccwgroup_remove_ccwdev,
2400 };
2401
2402 /**
2403 * LCS ccwgroup driver registration
2404 */
2405 static struct ccwgroup_driver lcs_group_driver = {
2406 .owner = THIS_MODULE,
2407 .name = "lcs",
2408 .max_slaves = 2,
2409 .driver_id = 0xD3C3E2,
2410 .probe = lcs_probe_device,
2411 .remove = lcs_remove_device,
2412 .set_online = lcs_new_device,
2413 .set_offline = lcs_shutdown_device,
2414 .prepare = lcs_prepare,
2415 .complete = lcs_complete,
2416 .freeze = lcs_freeze,
2417 .thaw = lcs_thaw,
2418 .restore = lcs_restore,
2419 };
2420
2421 static ssize_t
2422 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2423 size_t count)
2424 {
2425 int err;
2426 err = ccwgroup_create_from_string(lcs_root_dev,
2427 lcs_group_driver.driver_id,
2428 &lcs_ccw_driver, 2, buf);
2429 return err ? err : count;
2430 }
2431
2432 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2433
2434 static struct attribute *lcs_group_attrs[] = {
2435 &driver_attr_group.attr,
2436 NULL,
2437 };
2438
2439 static struct attribute_group lcs_group_attr_group = {
2440 .attrs = lcs_group_attrs,
2441 };
2442
2443 static const struct attribute_group *lcs_group_attr_groups[] = {
2444 &lcs_group_attr_group,
2445 NULL,
2446 };
2447
2448 /**
2449 * LCS Module/Kernel initialization function
2450 */
2451 static int
2452 __init lcs_init_module(void)
2453 {
2454 int rc;
2455
2456 pr_info("Loading %s\n", version);
2457 rc = lcs_register_debug_facility();
2458 LCS_DBF_TEXT(0, setup, "lcsinit");
2459 if (rc)
2460 goto out_err;
2461 lcs_root_dev = root_device_register("lcs");
2462 rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2463 if (rc)
2464 goto register_err;
2465 rc = ccw_driver_register(&lcs_ccw_driver);
2466 if (rc)
2467 goto ccw_err;
2468 lcs_group_driver.driver.groups = lcs_group_attr_groups;
2469 rc = ccwgroup_driver_register(&lcs_group_driver);
2470 if (rc)
2471 goto ccwgroup_err;
2472 return 0;
2473
2474 ccwgroup_err:
2475 ccw_driver_unregister(&lcs_ccw_driver);
2476 ccw_err:
2477 root_device_unregister(lcs_root_dev);
2478 register_err:
2479 lcs_unregister_debug_facility();
2480 out_err:
2481 pr_err("Initializing the lcs device driver failed\n");
2482 return rc;
2483 }
2484
2485
2486 /**
2487 * LCS module cleanup function
2488 */
2489 static void
2490 __exit lcs_cleanup_module(void)
2491 {
2492 pr_info("Terminating lcs module.\n");
2493 LCS_DBF_TEXT(0, trace, "cleanup");
2494 driver_remove_file(&lcs_group_driver.driver,
2495 &driver_attr_group);
2496 ccwgroup_driver_unregister(&lcs_group_driver);
2497 ccw_driver_unregister(&lcs_ccw_driver);
2498 root_device_unregister(lcs_root_dev);
2499 lcs_unregister_debug_facility();
2500 }
2501
2502 module_init(lcs_init_module);
2503 module_exit(lcs_cleanup_module);
2504
2505 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2506 MODULE_LICENSE("GPL");
2507
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