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md/raid1: avoid reading from known bad blocks.
[linux-2.6.git] / drivers / s390 / net / lcs.c
blobc3b8064a102dab48199d103953d5e2aa1b5f4386
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/kernel_stat.h>
30 #include <linux/module.h>
31 #include <linux/if.h>
32 #include <linux/netdevice.h>
33 #include <linux/etherdevice.h>
34 #include <linux/trdevice.h>
35 #include <linux/fddidevice.h>
36 #include <linux/inetdevice.h>
37 #include <linux/in.h>
38 #include <linux/igmp.h>
39 #include <linux/delay.h>
40 #include <linux/kthread.h>
41 #include <linux/slab.h>
42 #include <net/arp.h>
43 #include <net/ip.h>
44
45 #include <asm/debug.h>
46 #include <asm/idals.h>
47 #include <asm/timex.h>
48 #include <linux/device.h>
49 #include <asm/ccwgroup.h>
50
51 #include "lcs.h"
52
53
54 #if !defined(CONFIG_NET_ETHERNET) && \
55 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
56 #error Cannot compile lcs.c without some net devices switched on.
57 #endif
58
59 /**
60 * initialization string for output
61 */
62
63 static char version[] __initdata = "LCS driver";
64
65 /**
66 * the root device for lcs group devices
67 */
68 static struct device *lcs_root_dev;
69
70 /**
71 * Some prototypes.
72 */
73 static void lcs_tasklet(unsigned long);
74 static void lcs_start_kernel_thread(struct work_struct *);
75 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
76 #ifdef CONFIG_IP_MULTICAST
77 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
78 #endif /* CONFIG_IP_MULTICAST */
79 static int lcs_recovery(void *ptr);
80
81 /**
82 * Debug Facility Stuff
83 */
84 static char debug_buffer[255];
85 static debug_info_t *lcs_dbf_setup;
86 static debug_info_t *lcs_dbf_trace;
87
88 /**
89 * LCS Debug Facility functions
90 */
91 static void
92 lcs_unregister_debug_facility(void)
93 {
94 if (lcs_dbf_setup)
95 debug_unregister(lcs_dbf_setup);
96 if (lcs_dbf_trace)
97 debug_unregister(lcs_dbf_trace);
98 }
99
100 static int
101 lcs_register_debug_facility(void)
102 {
103 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
104 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
105 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
106 pr_err("Not enough memory for debug facility.\n");
107 lcs_unregister_debug_facility();
108 return -ENOMEM;
109 }
110 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
111 debug_set_level(lcs_dbf_setup, 2);
112 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
113 debug_set_level(lcs_dbf_trace, 2);
114 return 0;
115 }
116
117 /**
118 * Allocate io buffers.
119 */
120 static int
121 lcs_alloc_channel(struct lcs_channel *channel)
122 {
123 int cnt;
124
125 LCS_DBF_TEXT(2, setup, "ichalloc");
126 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
127 /* alloc memory fo iobuffer */
128 channel->iob[cnt].data =
129 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
130 if (channel->iob[cnt].data == NULL)
131 break;
132 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
133 }
134 if (cnt < LCS_NUM_BUFFS) {
135 /* Not all io buffers could be allocated. */
136 LCS_DBF_TEXT(2, setup, "echalloc");
137 while (cnt-- > 0)
138 kfree(channel->iob[cnt].data);
139 return -ENOMEM;
140 }
141 return 0;
142 }
143
144 /**
145 * Free io buffers.
146 */
147 static void
148 lcs_free_channel(struct lcs_channel *channel)
149 {
150 int cnt;
151
152 LCS_DBF_TEXT(2, setup, "ichfree");
153 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
154 kfree(channel->iob[cnt].data);
155 channel->iob[cnt].data = NULL;
156 }
157 }
158
159 /*
160 * Cleanup channel.
161 */
162 static void
163 lcs_cleanup_channel(struct lcs_channel *channel)
164 {
165 LCS_DBF_TEXT(3, setup, "cleanch");
166 /* Kill write channel tasklets. */
167 tasklet_kill(&channel->irq_tasklet);
168 /* Free channel buffers. */
169 lcs_free_channel(channel);
170 }
171
172 /**
173 * LCS free memory for card and channels.
174 */
175 static void
176 lcs_free_card(struct lcs_card *card)
177 {
178 LCS_DBF_TEXT(2, setup, "remcard");
179 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
180 kfree(card);
181 }
182
183 /**
184 * LCS alloc memory for card and channels
185 */
186 static struct lcs_card *
187 lcs_alloc_card(void)
188 {
189 struct lcs_card *card;
190 int rc;
191
192 LCS_DBF_TEXT(2, setup, "alloclcs");
193
194 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
195 if (card == NULL)
196 return NULL;
197 card->lan_type = LCS_FRAME_TYPE_AUTO;
198 card->pkt_seq = 0;
199 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
200 /* Allocate io buffers for the read channel. */
201 rc = lcs_alloc_channel(&card->read);
202 if (rc){
203 LCS_DBF_TEXT(2, setup, "iccwerr");
204 lcs_free_card(card);
205 return NULL;
206 }
207 /* Allocate io buffers for the write channel. */
208 rc = lcs_alloc_channel(&card->write);
209 if (rc) {
210 LCS_DBF_TEXT(2, setup, "iccwerr");
211 lcs_cleanup_channel(&card->read);
212 lcs_free_card(card);
213 return NULL;
214 }
215
216 #ifdef CONFIG_IP_MULTICAST
217 INIT_LIST_HEAD(&card->ipm_list);
218 #endif
219 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
220 return card;
221 }
222
223 /*
224 * Setup read channel.
225 */
226 static void
227 lcs_setup_read_ccws(struct lcs_card *card)
228 {
229 int cnt;
230
231 LCS_DBF_TEXT(2, setup, "ireadccw");
232 /* Setup read ccws. */
233 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
234 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
235 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
236 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
237 card->read.ccws[cnt].flags =
238 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
239 /*
240 * Note: we have allocated the buffer with GFP_DMA, so
241 * we do not need to do set_normalized_cda.
242 */
243 card->read.ccws[cnt].cda =
244 (__u32) __pa(card->read.iob[cnt].data);
245 ((struct lcs_header *)
246 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
247 card->read.iob[cnt].callback = lcs_get_frames_cb;
248 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
249 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
250 }
251 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
252 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
253 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
254 /* Last ccw is a tic (transfer in channel). */
255 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
256 card->read.ccws[LCS_NUM_BUFFS].cda =
257 (__u32) __pa(card->read.ccws);
258 /* Setg initial state of the read channel. */
259 card->read.state = LCS_CH_STATE_INIT;
260
261 card->read.io_idx = 0;
262 card->read.buf_idx = 0;
263 }
264
265 static void
266 lcs_setup_read(struct lcs_card *card)
267 {
268 LCS_DBF_TEXT(3, setup, "initread");
269
270 lcs_setup_read_ccws(card);
271 /* Initialize read channel tasklet. */
272 card->read.irq_tasklet.data = (unsigned long) &card->read;
273 card->read.irq_tasklet.func = lcs_tasklet;
274 /* Initialize waitqueue. */
275 init_waitqueue_head(&card->read.wait_q);
276 }
277
278 /*
279 * Setup write channel.
280 */
281 static void
282 lcs_setup_write_ccws(struct lcs_card *card)
283 {
284 int cnt;
285
286 LCS_DBF_TEXT(3, setup, "iwritccw");
287 /* Setup write ccws. */
288 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
289 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
290 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
291 card->write.ccws[cnt].count = 0;
292 card->write.ccws[cnt].flags =
293 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
294 /*
295 * Note: we have allocated the buffer with GFP_DMA, so
296 * we do not need to do set_normalized_cda.
297 */
298 card->write.ccws[cnt].cda =
299 (__u32) __pa(card->write.iob[cnt].data);
300 }
301 /* Last ccw is a tic (transfer in channel). */
302 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
303 card->write.ccws[LCS_NUM_BUFFS].cda =
304 (__u32) __pa(card->write.ccws);
305 /* Set initial state of the write channel. */
306 card->read.state = LCS_CH_STATE_INIT;
307
308 card->write.io_idx = 0;
309 card->write.buf_idx = 0;
310 }
311
312 static void
313 lcs_setup_write(struct lcs_card *card)
314 {
315 LCS_DBF_TEXT(3, setup, "initwrit");
316
317 lcs_setup_write_ccws(card);
318 /* Initialize write channel tasklet. */
319 card->write.irq_tasklet.data = (unsigned long) &card->write;
320 card->write.irq_tasklet.func = lcs_tasklet;
321 /* Initialize waitqueue. */
322 init_waitqueue_head(&card->write.wait_q);
323 }
324
325 static void
326 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
327 {
328 unsigned long flags;
329
330 spin_lock_irqsave(&card->mask_lock, flags);
331 card->thread_allowed_mask = threads;
332 spin_unlock_irqrestore(&card->mask_lock, flags);
333 wake_up(&card->wait_q);
334 }
335 static inline int
336 lcs_threads_running(struct lcs_card *card, unsigned long threads)
337 {
338 unsigned long flags;
339 int rc = 0;
340
341 spin_lock_irqsave(&card->mask_lock, flags);
342 rc = (card->thread_running_mask & threads);
343 spin_unlock_irqrestore(&card->mask_lock, flags);
344 return rc;
345 }
346
347 static int
348 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
349 {
350 return wait_event_interruptible(card->wait_q,
351 lcs_threads_running(card, threads) == 0);
352 }
353
354 static inline int
355 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
356 {
357 unsigned long flags;
358
359 spin_lock_irqsave(&card->mask_lock, flags);
360 if ( !(card->thread_allowed_mask & thread) ||
361 (card->thread_start_mask & thread) ) {
362 spin_unlock_irqrestore(&card->mask_lock, flags);
363 return -EPERM;
364 }
365 card->thread_start_mask |= thread;
366 spin_unlock_irqrestore(&card->mask_lock, flags);
367 return 0;
368 }
369
370 static void
371 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
372 {
373 unsigned long flags;
374
375 spin_lock_irqsave(&card->mask_lock, flags);
376 card->thread_running_mask &= ~thread;
377 spin_unlock_irqrestore(&card->mask_lock, flags);
378 wake_up(&card->wait_q);
379 }
380
381 static inline int
382 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
383 {
384 unsigned long flags;
385 int rc = 0;
386
387 spin_lock_irqsave(&card->mask_lock, flags);
388 if (card->thread_start_mask & thread){
389 if ((card->thread_allowed_mask & thread) &&
390 !(card->thread_running_mask & thread)){
391 rc = 1;
392 card->thread_start_mask &= ~thread;
393 card->thread_running_mask |= thread;
394 } else
395 rc = -EPERM;
396 }
397 spin_unlock_irqrestore(&card->mask_lock, flags);
398 return rc;
399 }
400
401 static int
402 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
403 {
404 int rc = 0;
405 wait_event(card->wait_q,
406 (rc = __lcs_do_run_thread(card, thread)) >= 0);
407 return rc;
408 }
409
410 static int
411 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
412 {
413 unsigned long flags;
414 int rc = 0;
415
416 spin_lock_irqsave(&card->mask_lock, flags);
417 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
418 (u8) card->thread_start_mask,
419 (u8) card->thread_allowed_mask,
420 (u8) card->thread_running_mask);
421 rc = (card->thread_start_mask & thread);
422 spin_unlock_irqrestore(&card->mask_lock, flags);
423 return rc;
424 }
425
426 /**
427 * Initialize channels,card and state machines.
428 */
429 static void
430 lcs_setup_card(struct lcs_card *card)
431 {
432 LCS_DBF_TEXT(2, setup, "initcard");
433 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
434
435 lcs_setup_read(card);
436 lcs_setup_write(card);
437 /* Set cards initial state. */
438 card->state = DEV_STATE_DOWN;
439 card->tx_buffer = NULL;
440 card->tx_emitted = 0;
441
442 init_waitqueue_head(&card->wait_q);
443 spin_lock_init(&card->lock);
444 spin_lock_init(&card->ipm_lock);
445 spin_lock_init(&card->mask_lock);
446 #ifdef CONFIG_IP_MULTICAST
447 INIT_LIST_HEAD(&card->ipm_list);
448 #endif
449 INIT_LIST_HEAD(&card->lancmd_waiters);
450 }
451
452 static inline void
453 lcs_clear_multicast_list(struct lcs_card *card)
454 {
455 #ifdef CONFIG_IP_MULTICAST
456 struct lcs_ipm_list *ipm;
457 unsigned long flags;
458
459 /* Free multicast list. */
460 LCS_DBF_TEXT(3, setup, "clmclist");
461 spin_lock_irqsave(&card->ipm_lock, flags);
462 while (!list_empty(&card->ipm_list)){
463 ipm = list_entry(card->ipm_list.next,
464 struct lcs_ipm_list, list);
465 list_del(&ipm->list);
466 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
467 spin_unlock_irqrestore(&card->ipm_lock, flags);
468 lcs_send_delipm(card, ipm);
469 spin_lock_irqsave(&card->ipm_lock, flags);
470 }
471 kfree(ipm);
472 }
473 spin_unlock_irqrestore(&card->ipm_lock, flags);
474 #endif
475 }
476 /**
477 * Cleanup channels,card and state machines.
478 */
479 static void
480 lcs_cleanup_card(struct lcs_card *card)
481 {
482
483 LCS_DBF_TEXT(3, setup, "cleancrd");
484 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
485
486 if (card->dev != NULL)
487 free_netdev(card->dev);
488 /* Cleanup channels. */
489 lcs_cleanup_channel(&card->write);
490 lcs_cleanup_channel(&card->read);
491 }
492
493 /**
494 * Start channel.
495 */
496 static int
497 lcs_start_channel(struct lcs_channel *channel)
498 {
499 unsigned long flags;
500 int rc;
501
502 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
503 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
504 rc = ccw_device_start(channel->ccwdev,
505 channel->ccws + channel->io_idx, 0, 0,
506 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
507 if (rc == 0)
508 channel->state = LCS_CH_STATE_RUNNING;
509 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
510 if (rc) {
511 LCS_DBF_TEXT_(4,trace,"essh%s",
512 dev_name(&channel->ccwdev->dev));
513 dev_err(&channel->ccwdev->dev,
514 "Starting an LCS device resulted in an error,"
515 " rc=%d!\n", rc);
516 }
517 return rc;
518 }
519
520 static int
521 lcs_clear_channel(struct lcs_channel *channel)
522 {
523 unsigned long flags;
524 int rc;
525
526 LCS_DBF_TEXT(4,trace,"clearch");
527 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
528 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
529 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
530 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
531 if (rc) {
532 LCS_DBF_TEXT_(4, trace, "ecsc%s",
533 dev_name(&channel->ccwdev->dev));
534 return rc;
535 }
536 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
537 channel->state = LCS_CH_STATE_STOPPED;
538 return rc;
539 }
540
541
542 /**
543 * Stop channel.
544 */
545 static int
546 lcs_stop_channel(struct lcs_channel *channel)
547 {
548 unsigned long flags;
549 int rc;
550
551 if (channel->state == LCS_CH_STATE_STOPPED)
552 return 0;
553 LCS_DBF_TEXT(4,trace,"haltsch");
554 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
555 channel->state = LCS_CH_STATE_INIT;
556 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
557 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
558 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
559 if (rc) {
560 LCS_DBF_TEXT_(4, trace, "ehsc%s",
561 dev_name(&channel->ccwdev->dev));
562 return rc;
563 }
564 /* Asynchronous halt initialted. Wait for its completion. */
565 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
566 lcs_clear_channel(channel);
567 return 0;
568 }
569
570 /**
571 * start read and write channel
572 */
573 static int
574 lcs_start_channels(struct lcs_card *card)
575 {
576 int rc;
577
578 LCS_DBF_TEXT(2, trace, "chstart");
579 /* start read channel */
580 rc = lcs_start_channel(&card->read);
581 if (rc)
582 return rc;
583 /* start write channel */
584 rc = lcs_start_channel(&card->write);
585 if (rc)
586 lcs_stop_channel(&card->read);
587 return rc;
588 }
589
590 /**
591 * stop read and write channel
592 */
593 static int
594 lcs_stop_channels(struct lcs_card *card)
595 {
596 LCS_DBF_TEXT(2, trace, "chhalt");
597 lcs_stop_channel(&card->read);
598 lcs_stop_channel(&card->write);
599 return 0;
600 }
601
602 /**
603 * Get empty buffer.
604 */
605 static struct lcs_buffer *
606 __lcs_get_buffer(struct lcs_channel *channel)
607 {
608 int index;
609
610 LCS_DBF_TEXT(5, trace, "_getbuff");
611 index = channel->io_idx;
612 do {
613 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
614 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
615 return channel->iob + index;
616 }
617 index = (index + 1) & (LCS_NUM_BUFFS - 1);
618 } while (index != channel->io_idx);
619 return NULL;
620 }
621
622 static struct lcs_buffer *
623 lcs_get_buffer(struct lcs_channel *channel)
624 {
625 struct lcs_buffer *buffer;
626 unsigned long flags;
627
628 LCS_DBF_TEXT(5, trace, "getbuff");
629 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
630 buffer = __lcs_get_buffer(channel);
631 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
632 return buffer;
633 }
634
635 /**
636 * Resume channel program if the channel is suspended.
637 */
638 static int
639 __lcs_resume_channel(struct lcs_channel *channel)
640 {
641 int rc;
642
643 if (channel->state != LCS_CH_STATE_SUSPENDED)
644 return 0;
645 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
646 return 0;
647 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
648 rc = ccw_device_resume(channel->ccwdev);
649 if (rc) {
650 LCS_DBF_TEXT_(4, trace, "ersc%s",
651 dev_name(&channel->ccwdev->dev));
652 dev_err(&channel->ccwdev->dev,
653 "Sending data from the LCS device to the LAN failed"
654 " with rc=%d\n",rc);
655 } else
656 channel->state = LCS_CH_STATE_RUNNING;
657 return rc;
658
659 }
660
661 /**
662 * Make a buffer ready for processing.
663 */
664 static inline void
665 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
666 {
667 int prev, next;
668
669 LCS_DBF_TEXT(5, trace, "rdybits");
670 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
671 next = (index + 1) & (LCS_NUM_BUFFS - 1);
672 /* Check if we may clear the suspend bit of this buffer. */
673 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
674 /* Check if we have to set the PCI bit. */
675 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
676 /* Suspend bit of the previous buffer is not set. */
677 channel->ccws[index].flags |= CCW_FLAG_PCI;
678 /* Suspend bit of the next buffer is set. */
679 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
680 }
681 }
682
683 static int
684 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
685 {
686 unsigned long flags;
687 int index, rc;
688
689 LCS_DBF_TEXT(5, trace, "rdybuff");
690 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
691 buffer->state != LCS_BUF_STATE_PROCESSED);
692 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
693 buffer->state = LCS_BUF_STATE_READY;
694 index = buffer - channel->iob;
695 /* Set length. */
696 channel->ccws[index].count = buffer->count;
697 /* Check relevant PCI/suspend bits. */
698 __lcs_ready_buffer_bits(channel, index);
699 rc = __lcs_resume_channel(channel);
700 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
701 return rc;
702 }
703
704 /**
705 * Mark the buffer as processed. Take care of the suspend bit
706 * of the previous buffer. This function is called from
707 * interrupt context, so the lock must not be taken.
708 */
709 static int
710 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
711 {
712 int index, prev, next;
713
714 LCS_DBF_TEXT(5, trace, "prcsbuff");
715 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
716 buffer->state = LCS_BUF_STATE_PROCESSED;
717 index = buffer - channel->iob;
718 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
719 next = (index + 1) & (LCS_NUM_BUFFS - 1);
720 /* Set the suspend bit and clear the PCI bit of this buffer. */
721 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
722 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
723 /* Check the suspend bit of the previous buffer. */
724 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
725 /*
726 * Previous buffer is in state ready. It might have
727 * happened in lcs_ready_buffer that the suspend bit
728 * has not been cleared to avoid an endless loop.
729 * Do it now.
730 */
731 __lcs_ready_buffer_bits(channel, prev);
732 }
733 /* Clear PCI bit of next buffer. */
734 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
735 return __lcs_resume_channel(channel);
736 }
737
738 /**
739 * Put a processed buffer back to state empty.
740 */
741 static void
742 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
743 {
744 unsigned long flags;
745
746 LCS_DBF_TEXT(5, trace, "relbuff");
747 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
748 buffer->state != LCS_BUF_STATE_PROCESSED);
749 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
750 buffer->state = LCS_BUF_STATE_EMPTY;
751 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
752 }
753
754 /**
755 * Get buffer for a lan command.
756 */
757 static struct lcs_buffer *
758 lcs_get_lancmd(struct lcs_card *card, int count)
759 {
760 struct lcs_buffer *buffer;
761 struct lcs_cmd *cmd;
762
763 LCS_DBF_TEXT(4, trace, "getlncmd");
764 /* Get buffer and wait if none is available. */
765 wait_event(card->write.wait_q,
766 ((buffer = lcs_get_buffer(&card->write)) != NULL));
767 count += sizeof(struct lcs_header);
768 *(__u16 *)(buffer->data + count) = 0;
769 buffer->count = count + sizeof(__u16);
770 buffer->callback = lcs_release_buffer;
771 cmd = (struct lcs_cmd *) buffer->data;
772 cmd->offset = count;
773 cmd->type = LCS_FRAME_TYPE_CONTROL;
774 cmd->slot = 0;
775 return buffer;
776 }
777
778
779 static void
780 lcs_get_reply(struct lcs_reply *reply)
781 {
782 WARN_ON(atomic_read(&reply->refcnt) <= 0);
783 atomic_inc(&reply->refcnt);
784 }
785
786 static void
787 lcs_put_reply(struct lcs_reply *reply)
788 {
789 WARN_ON(atomic_read(&reply->refcnt) <= 0);
790 if (atomic_dec_and_test(&reply->refcnt)) {
791 kfree(reply);
792 }
793
794 }
795
796 static struct lcs_reply *
797 lcs_alloc_reply(struct lcs_cmd *cmd)
798 {
799 struct lcs_reply *reply;
800
801 LCS_DBF_TEXT(4, trace, "getreply");
802
803 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
804 if (!reply)
805 return NULL;
806 atomic_set(&reply->refcnt,1);
807 reply->sequence_no = cmd->sequence_no;
808 reply->received = 0;
809 reply->rc = 0;
810 init_waitqueue_head(&reply->wait_q);
811
812 return reply;
813 }
814
815 /**
816 * Notifier function for lancmd replies. Called from read irq.
817 */
818 static void
819 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
820 {
821 struct list_head *l, *n;
822 struct lcs_reply *reply;
823
824 LCS_DBF_TEXT(4, trace, "notiwait");
825 spin_lock(&card->lock);
826 list_for_each_safe(l, n, &card->lancmd_waiters) {
827 reply = list_entry(l, struct lcs_reply, list);
828 if (reply->sequence_no == cmd->sequence_no) {
829 lcs_get_reply(reply);
830 list_del_init(&reply->list);
831 if (reply->callback != NULL)
832 reply->callback(card, cmd);
833 reply->received = 1;
834 reply->rc = cmd->return_code;
835 wake_up(&reply->wait_q);
836 lcs_put_reply(reply);
837 break;
838 }
839 }
840 spin_unlock(&card->lock);
841 }
842
843 /**
844 * Emit buffer of a lan command.
845 */
846 static void
847 lcs_lancmd_timeout(unsigned long data)
848 {
849 struct lcs_reply *reply, *list_reply, *r;
850 unsigned long flags;
851
852 LCS_DBF_TEXT(4, trace, "timeout");
853 reply = (struct lcs_reply *) data;
854 spin_lock_irqsave(&reply->card->lock, flags);
855 list_for_each_entry_safe(list_reply, r,
856 &reply->card->lancmd_waiters,list) {
857 if (reply == list_reply) {
858 lcs_get_reply(reply);
859 list_del_init(&reply->list);
860 spin_unlock_irqrestore(&reply->card->lock, flags);
861 reply->received = 1;
862 reply->rc = -ETIME;
863 wake_up(&reply->wait_q);
864 lcs_put_reply(reply);
865 return;
866 }
867 }
868 spin_unlock_irqrestore(&reply->card->lock, flags);
869 }
870
871 static int
872 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
873 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
874 {
875 struct lcs_reply *reply;
876 struct lcs_cmd *cmd;
877 struct timer_list timer;
878 unsigned long flags;
879 int rc;
880
881 LCS_DBF_TEXT(4, trace, "sendcmd");
882 cmd = (struct lcs_cmd *) buffer->data;
883 cmd->return_code = 0;
884 cmd->sequence_no = card->sequence_no++;
885 reply = lcs_alloc_reply(cmd);
886 if (!reply)
887 return -ENOMEM;
888 reply->callback = reply_callback;
889 reply->card = card;
890 spin_lock_irqsave(&card->lock, flags);
891 list_add_tail(&reply->list, &card->lancmd_waiters);
892 spin_unlock_irqrestore(&card->lock, flags);
893
894 buffer->callback = lcs_release_buffer;
895 rc = lcs_ready_buffer(&card->write, buffer);
896 if (rc)
897 return rc;
898 init_timer_on_stack(&timer);
899 timer.function = lcs_lancmd_timeout;
900 timer.data = (unsigned long) reply;
901 timer.expires = jiffies + HZ*card->lancmd_timeout;
902 add_timer(&timer);
903 wait_event(reply->wait_q, reply->received);
904 del_timer_sync(&timer);
905 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
906 rc = reply->rc;
907 lcs_put_reply(reply);
908 return rc ? -EIO : 0;
909 }
910
911 /**
912 * LCS startup command
913 */
914 static int
915 lcs_send_startup(struct lcs_card *card, __u8 initiator)
916 {
917 struct lcs_buffer *buffer;
918 struct lcs_cmd *cmd;
919
920 LCS_DBF_TEXT(2, trace, "startup");
921 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
922 cmd = (struct lcs_cmd *) buffer->data;
923 cmd->cmd_code = LCS_CMD_STARTUP;
924 cmd->initiator = initiator;
925 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
926 return lcs_send_lancmd(card, buffer, NULL);
927 }
928
929 /**
930 * LCS shutdown command
931 */
932 static int
933 lcs_send_shutdown(struct lcs_card *card)
934 {
935 struct lcs_buffer *buffer;
936 struct lcs_cmd *cmd;
937
938 LCS_DBF_TEXT(2, trace, "shutdown");
939 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
940 cmd = (struct lcs_cmd *) buffer->data;
941 cmd->cmd_code = LCS_CMD_SHUTDOWN;
942 cmd->initiator = LCS_INITIATOR_TCPIP;
943 return lcs_send_lancmd(card, buffer, NULL);
944 }
945
946 /**
947 * LCS lanstat command
948 */
949 static void
950 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
951 {
952 LCS_DBF_TEXT(2, trace, "statcb");
953 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
954 }
955
956 static int
957 lcs_send_lanstat(struct lcs_card *card)
958 {
959 struct lcs_buffer *buffer;
960 struct lcs_cmd *cmd;
961
962 LCS_DBF_TEXT(2,trace, "cmdstat");
963 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
964 cmd = (struct lcs_cmd *) buffer->data;
965 /* Setup lanstat command. */
966 cmd->cmd_code = LCS_CMD_LANSTAT;
967 cmd->initiator = LCS_INITIATOR_TCPIP;
968 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
969 cmd->cmd.lcs_std_cmd.portno = card->portno;
970 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
971 }
972
973 /**
974 * send stoplan command
975 */
976 static int
977 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
978 {
979 struct lcs_buffer *buffer;
980 struct lcs_cmd *cmd;
981
982 LCS_DBF_TEXT(2, trace, "cmdstpln");
983 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
984 cmd = (struct lcs_cmd *) buffer->data;
985 cmd->cmd_code = LCS_CMD_STOPLAN;
986 cmd->initiator = initiator;
987 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
988 cmd->cmd.lcs_std_cmd.portno = card->portno;
989 return lcs_send_lancmd(card, buffer, NULL);
990 }
991
992 /**
993 * send startlan command
994 */
995 static void
996 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
997 {
998 LCS_DBF_TEXT(2, trace, "srtlancb");
999 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
1000 card->portno = cmd->cmd.lcs_std_cmd.portno;
1001 }
1002
1003 static int
1004 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1005 {
1006 struct lcs_buffer *buffer;
1007 struct lcs_cmd *cmd;
1008
1009 LCS_DBF_TEXT(2, trace, "cmdstaln");
1010 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1011 cmd = (struct lcs_cmd *) buffer->data;
1012 cmd->cmd_code = LCS_CMD_STARTLAN;
1013 cmd->initiator = initiator;
1014 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1015 cmd->cmd.lcs_std_cmd.portno = card->portno;
1016 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1017 }
1018
1019 #ifdef CONFIG_IP_MULTICAST
1020 /**
1021 * send setipm command (Multicast)
1022 */
1023 static int
1024 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1025 {
1026 struct lcs_buffer *buffer;
1027 struct lcs_cmd *cmd;
1028
1029 LCS_DBF_TEXT(2, trace, "cmdsetim");
1030 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1031 cmd = (struct lcs_cmd *) buffer->data;
1032 cmd->cmd_code = LCS_CMD_SETIPM;
1033 cmd->initiator = LCS_INITIATOR_TCPIP;
1034 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1035 cmd->cmd.lcs_qipassist.portno = card->portno;
1036 cmd->cmd.lcs_qipassist.version = 4;
1037 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1038 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1039 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1040 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1041 return lcs_send_lancmd(card, buffer, NULL);
1042 }
1043
1044 /**
1045 * send delipm command (Multicast)
1046 */
1047 static int
1048 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1049 {
1050 struct lcs_buffer *buffer;
1051 struct lcs_cmd *cmd;
1052
1053 LCS_DBF_TEXT(2, trace, "cmddelim");
1054 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1055 cmd = (struct lcs_cmd *) buffer->data;
1056 cmd->cmd_code = LCS_CMD_DELIPM;
1057 cmd->initiator = LCS_INITIATOR_TCPIP;
1058 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1059 cmd->cmd.lcs_qipassist.portno = card->portno;
1060 cmd->cmd.lcs_qipassist.version = 4;
1061 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1062 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1063 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1064 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1065 return lcs_send_lancmd(card, buffer, NULL);
1066 }
1067
1068 /**
1069 * check if multicast is supported by LCS
1070 */
1071 static void
1072 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1073 {
1074 LCS_DBF_TEXT(2, trace, "chkmccb");
1075 card->ip_assists_supported =
1076 cmd->cmd.lcs_qipassist.ip_assists_supported;
1077 card->ip_assists_enabled =
1078 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1079 }
1080
1081 static int
1082 lcs_check_multicast_support(struct lcs_card *card)
1083 {
1084 struct lcs_buffer *buffer;
1085 struct lcs_cmd *cmd;
1086 int rc;
1087
1088 LCS_DBF_TEXT(2, trace, "cmdqipa");
1089 /* Send query ipassist. */
1090 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1091 cmd = (struct lcs_cmd *) buffer->data;
1092 cmd->cmd_code = LCS_CMD_QIPASSIST;
1093 cmd->initiator = LCS_INITIATOR_TCPIP;
1094 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1095 cmd->cmd.lcs_qipassist.portno = card->portno;
1096 cmd->cmd.lcs_qipassist.version = 4;
1097 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1098 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1099 if (rc != 0) {
1100 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1101 return -EOPNOTSUPP;
1102 }
1103 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1104 return 0;
1105 return -EOPNOTSUPP;
1106 }
1107
1108 /**
1109 * set or del multicast address on LCS card
1110 */
1111 static void
1112 lcs_fix_multicast_list(struct lcs_card *card)
1113 {
1114 struct list_head failed_list;
1115 struct lcs_ipm_list *ipm, *tmp;
1116 unsigned long flags;
1117 int rc;
1118
1119 LCS_DBF_TEXT(4,trace, "fixipm");
1120 INIT_LIST_HEAD(&failed_list);
1121 spin_lock_irqsave(&card->ipm_lock, flags);
1122 list_modified:
1123 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1124 switch (ipm->ipm_state) {
1125 case LCS_IPM_STATE_SET_REQUIRED:
1126 /* del from ipm_list so no one else can tamper with
1127 * this entry */
1128 list_del_init(&ipm->list);
1129 spin_unlock_irqrestore(&card->ipm_lock, flags);
1130 rc = lcs_send_setipm(card, ipm);
1131 spin_lock_irqsave(&card->ipm_lock, flags);
1132 if (rc) {
1133 pr_info("Adding multicast address failed."
1134 " Table possibly full!\n");
1135 /* store ipm in failed list -> will be added
1136 * to ipm_list again, so a retry will be done
1137 * during the next call of this function */
1138 list_add_tail(&ipm->list, &failed_list);
1139 } else {
1140 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1141 /* re-insert into ipm_list */
1142 list_add_tail(&ipm->list, &card->ipm_list);
1143 }
1144 goto list_modified;
1145 case LCS_IPM_STATE_DEL_REQUIRED:
1146 list_del(&ipm->list);
1147 spin_unlock_irqrestore(&card->ipm_lock, flags);
1148 lcs_send_delipm(card, ipm);
1149 spin_lock_irqsave(&card->ipm_lock, flags);
1150 kfree(ipm);
1151 goto list_modified;
1152 case LCS_IPM_STATE_ON_CARD:
1153 break;
1154 }
1155 }
1156 /* re-insert all entries from the failed_list into ipm_list */
1157 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1158 list_move_tail(&ipm->list, &card->ipm_list);
1159
1160 spin_unlock_irqrestore(&card->ipm_lock, flags);
1161 }
1162
1163 /**
1164 * get mac address for the relevant Multicast address
1165 */
1166 static void
1167 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1168 {
1169 LCS_DBF_TEXT(4,trace, "getmac");
1170 if (dev->type == ARPHRD_IEEE802_TR)
1171 ip_tr_mc_map(ipm, mac);
1172 else
1173 ip_eth_mc_map(ipm, mac);
1174 }
1175
1176 /**
1177 * function called by net device to handle multicast address relevant things
1178 */
1179 static inline void
1180 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1181 {
1182 struct ip_mc_list *im4;
1183 struct list_head *l;
1184 struct lcs_ipm_list *ipm;
1185 unsigned long flags;
1186 char buf[MAX_ADDR_LEN];
1187
1188 LCS_DBF_TEXT(4, trace, "remmclst");
1189 spin_lock_irqsave(&card->ipm_lock, flags);
1190 list_for_each(l, &card->ipm_list) {
1191 ipm = list_entry(l, struct lcs_ipm_list, list);
1192 for (im4 = rcu_dereference(in4_dev->mc_list);
1193 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1194 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1195 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1196 (memcmp(buf, &ipm->ipm.mac_addr,
1197 LCS_MAC_LENGTH) == 0) )
1198 break;
1199 }
1200 if (im4 == NULL)
1201 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1202 }
1203 spin_unlock_irqrestore(&card->ipm_lock, flags);
1204 }
1205
1206 static inline struct lcs_ipm_list *
1207 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1208 {
1209 struct lcs_ipm_list *tmp, *ipm = NULL;
1210 struct list_head *l;
1211 unsigned long flags;
1212
1213 LCS_DBF_TEXT(4, trace, "chkmcent");
1214 spin_lock_irqsave(&card->ipm_lock, flags);
1215 list_for_each(l, &card->ipm_list) {
1216 tmp = list_entry(l, struct lcs_ipm_list, list);
1217 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1218 (memcmp(buf, &tmp->ipm.mac_addr,
1219 LCS_MAC_LENGTH) == 0) ) {
1220 ipm = tmp;
1221 break;
1222 }
1223 }
1224 spin_unlock_irqrestore(&card->ipm_lock, flags);
1225 return ipm;
1226 }
1227
1228 static inline void
1229 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1230 {
1231
1232 struct ip_mc_list *im4;
1233 struct lcs_ipm_list *ipm;
1234 char buf[MAX_ADDR_LEN];
1235 unsigned long flags;
1236
1237 LCS_DBF_TEXT(4, trace, "setmclst");
1238 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1239 im4 = rcu_dereference(im4->next_rcu)) {
1240 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1241 ipm = lcs_check_addr_entry(card, im4, buf);
1242 if (ipm != NULL)
1243 continue; /* Address already in list. */
1244 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1245 if (ipm == NULL) {
1246 pr_info("Not enough memory to add"
1247 " new multicast entry!\n");
1248 break;
1249 }
1250 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1251 ipm->ipm.ip_addr = im4->multiaddr;
1252 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1253 spin_lock_irqsave(&card->ipm_lock, flags);
1254 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1255 list_add(&ipm->list, &card->ipm_list);
1256 spin_unlock_irqrestore(&card->ipm_lock, flags);
1257 }
1258 }
1259
1260 static int
1261 lcs_register_mc_addresses(void *data)
1262 {
1263 struct lcs_card *card;
1264 struct in_device *in4_dev;
1265
1266 card = (struct lcs_card *) data;
1267
1268 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1269 return 0;
1270 LCS_DBF_TEXT(4, trace, "regmulti");
1271
1272 in4_dev = in_dev_get(card->dev);
1273 if (in4_dev == NULL)
1274 goto out;
1275 rcu_read_lock();
1276 lcs_remove_mc_addresses(card,in4_dev);
1277 lcs_set_mc_addresses(card, in4_dev);
1278 rcu_read_unlock();
1279 in_dev_put(in4_dev);
1280
1281 netif_carrier_off(card->dev);
1282 netif_tx_disable(card->dev);
1283 wait_event(card->write.wait_q,
1284 (card->write.state != LCS_CH_STATE_RUNNING));
1285 lcs_fix_multicast_list(card);
1286 if (card->state == DEV_STATE_UP) {
1287 netif_carrier_on(card->dev);
1288 netif_wake_queue(card->dev);
1289 }
1290 out:
1291 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1292 return 0;
1293 }
1294 #endif /* CONFIG_IP_MULTICAST */
1295
1296 /**
1297 * function called by net device to
1298 * handle multicast address relevant things
1299 */
1300 static void
1301 lcs_set_multicast_list(struct net_device *dev)
1302 {
1303 #ifdef CONFIG_IP_MULTICAST
1304 struct lcs_card *card;
1305
1306 LCS_DBF_TEXT(4, trace, "setmulti");
1307 card = (struct lcs_card *) dev->ml_priv;
1308
1309 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1310 schedule_work(&card->kernel_thread_starter);
1311 #endif /* CONFIG_IP_MULTICAST */
1312 }
1313
1314 static long
1315 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1316 {
1317 if (!IS_ERR(irb))
1318 return 0;
1319
1320 switch (PTR_ERR(irb)) {
1321 case -EIO:
1322 dev_warn(&cdev->dev,
1323 "An I/O-error occurred on the LCS device\n");
1324 LCS_DBF_TEXT(2, trace, "ckirberr");
1325 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1326 break;
1327 case -ETIMEDOUT:
1328 dev_warn(&cdev->dev,
1329 "A command timed out on the LCS device\n");
1330 LCS_DBF_TEXT(2, trace, "ckirberr");
1331 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1332 break;
1333 default:
1334 dev_warn(&cdev->dev,
1335 "An error occurred on the LCS device, rc=%ld\n",
1336 PTR_ERR(irb));
1337 LCS_DBF_TEXT(2, trace, "ckirberr");
1338 LCS_DBF_TEXT(2, trace, " rc???");
1339 }
1340 return PTR_ERR(irb);
1341 }
1342
1343 static int
1344 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1345 {
1346 int dstat, cstat;
1347 char *sense;
1348
1349 sense = (char *) irb->ecw;
1350 cstat = irb->scsw.cmd.cstat;
1351 dstat = irb->scsw.cmd.dstat;
1352
1353 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1354 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1355 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1356 LCS_DBF_TEXT(2, trace, "CGENCHK");
1357 return 1;
1358 }
1359 if (dstat & DEV_STAT_UNIT_CHECK) {
1360 if (sense[LCS_SENSE_BYTE_1] &
1361 LCS_SENSE_RESETTING_EVENT) {
1362 LCS_DBF_TEXT(2, trace, "REVIND");
1363 return 1;
1364 }
1365 if (sense[LCS_SENSE_BYTE_0] &
1366 LCS_SENSE_CMD_REJECT) {
1367 LCS_DBF_TEXT(2, trace, "CMDREJ");
1368 return 0;
1369 }
1370 if ((!sense[LCS_SENSE_BYTE_0]) &&
1371 (!sense[LCS_SENSE_BYTE_1]) &&
1372 (!sense[LCS_SENSE_BYTE_2]) &&
1373 (!sense[LCS_SENSE_BYTE_3])) {
1374 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1375 return 0;
1376 }
1377 LCS_DBF_TEXT(2, trace, "DGENCHK");
1378 return 1;
1379 }
1380 return 0;
1381 }
1382
1383 static void
1384 lcs_schedule_recovery(struct lcs_card *card)
1385 {
1386 LCS_DBF_TEXT(2, trace, "startrec");
1387 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1388 schedule_work(&card->kernel_thread_starter);
1389 }
1390
1391 /**
1392 * IRQ Handler for LCS channels
1393 */
1394 static void
1395 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1396 {
1397 struct lcs_card *card;
1398 struct lcs_channel *channel;
1399 int rc, index;
1400 int cstat, dstat;
1401
1402 kstat_cpu(smp_processor_id()).irqs[IOINT_LCS]++;
1403 if (lcs_check_irb_error(cdev, irb))
1404 return;
1405
1406 card = CARD_FROM_DEV(cdev);
1407 if (card->read.ccwdev == cdev)
1408 channel = &card->read;
1409 else
1410 channel = &card->write;
1411
1412 cstat = irb->scsw.cmd.cstat;
1413 dstat = irb->scsw.cmd.dstat;
1414 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1415 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1416 irb->scsw.cmd.dstat);
1417 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1418 irb->scsw.cmd.actl);
1419
1420 /* Check for channel and device errors presented */
1421 rc = lcs_get_problem(cdev, irb);
1422 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1423 dev_warn(&cdev->dev,
1424 "The LCS device stopped because of an error,"
1425 " dstat=0x%X, cstat=0x%X \n",
1426 dstat, cstat);
1427 if (rc) {
1428 channel->state = LCS_CH_STATE_ERROR;
1429 }
1430 }
1431 if (channel->state == LCS_CH_STATE_ERROR) {
1432 lcs_schedule_recovery(card);
1433 wake_up(&card->wait_q);
1434 return;
1435 }
1436 /* How far in the ccw chain have we processed? */
1437 if ((channel->state != LCS_CH_STATE_INIT) &&
1438 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1439 (irb->scsw.cmd.cpa != 0)) {
1440 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1441 - channel->ccws;
1442 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1443 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1444 /* Bloody io subsystem tells us lies about cpa... */
1445 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1446 while (channel->io_idx != index) {
1447 __lcs_processed_buffer(channel,
1448 channel->iob + channel->io_idx);
1449 channel->io_idx =
1450 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1451 }
1452 }
1453
1454 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1455 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1456 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1457 /* Mark channel as stopped. */
1458 channel->state = LCS_CH_STATE_STOPPED;
1459 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1460 /* CCW execution stopped on a suspend bit. */
1461 channel->state = LCS_CH_STATE_SUSPENDED;
1462 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1463 if (irb->scsw.cmd.cc != 0) {
1464 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1465 return;
1466 }
1467 /* The channel has been stopped by halt_IO. */
1468 channel->state = LCS_CH_STATE_HALTED;
1469 }
1470 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1471 channel->state = LCS_CH_STATE_CLEARED;
1472 /* Do the rest in the tasklet. */
1473 tasklet_schedule(&channel->irq_tasklet);
1474 }
1475
1476 /**
1477 * Tasklet for IRQ handler
1478 */
1479 static void
1480 lcs_tasklet(unsigned long data)
1481 {
1482 unsigned long flags;
1483 struct lcs_channel *channel;
1484 struct lcs_buffer *iob;
1485 int buf_idx;
1486
1487 channel = (struct lcs_channel *) data;
1488 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1489
1490 /* Check for processed buffers. */
1491 iob = channel->iob;
1492 buf_idx = channel->buf_idx;
1493 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1494 /* Do the callback thing. */
1495 if (iob[buf_idx].callback != NULL)
1496 iob[buf_idx].callback(channel, iob + buf_idx);
1497 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1498 }
1499 channel->buf_idx = buf_idx;
1500
1501 if (channel->state == LCS_CH_STATE_STOPPED)
1502 lcs_start_channel(channel);
1503 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1504 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1505 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1506 __lcs_resume_channel(channel);
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 .driver = {
2396 .owner = THIS_MODULE,
2397 .name = "lcs",
2398 },
2399 .ids = lcs_ids,
2400 .probe = ccwgroup_probe_ccwdev,
2401 .remove = ccwgroup_remove_ccwdev,
2402 };
2403
2404 /**
2405 * LCS ccwgroup driver registration
2406 */
2407 static struct ccwgroup_driver lcs_group_driver = {
2408 .driver = {
2409 .owner = THIS_MODULE,
2410 .name = "lcs",
2411 },
2412 .max_slaves = 2,
2413 .driver_id = 0xD3C3E2,
2414 .probe = lcs_probe_device,
2415 .remove = lcs_remove_device,
2416 .set_online = lcs_new_device,
2417 .set_offline = lcs_shutdown_device,
2418 .prepare = lcs_prepare,
2419 .complete = lcs_complete,
2420 .freeze = lcs_freeze,
2421 .thaw = lcs_thaw,
2422 .restore = lcs_restore,
2423 };
2424
2425 static ssize_t
2426 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2427 size_t count)
2428 {
2429 int err;
2430 err = ccwgroup_create_from_string(lcs_root_dev,
2431 lcs_group_driver.driver_id,
2432 &lcs_ccw_driver, 2, buf);
2433 return err ? err : count;
2434 }
2435
2436 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2437
2438 static struct attribute *lcs_group_attrs[] = {
2439 &driver_attr_group.attr,
2440 NULL,
2441 };
2442
2443 static struct attribute_group lcs_group_attr_group = {
2444 .attrs = lcs_group_attrs,
2445 };
2446
2447 static const struct attribute_group *lcs_group_attr_groups[] = {
2448 &lcs_group_attr_group,
2449 NULL,
2450 };
2451
2452 /**
2453 * LCS Module/Kernel initialization function
2454 */
2455 static int
2456 __init lcs_init_module(void)
2457 {
2458 int rc;
2459
2460 pr_info("Loading %s\n", version);
2461 rc = lcs_register_debug_facility();
2462 LCS_DBF_TEXT(0, setup, "lcsinit");
2463 if (rc)
2464 goto out_err;
2465 lcs_root_dev = root_device_register("lcs");
2466 rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2467 if (rc)
2468 goto register_err;
2469 rc = ccw_driver_register(&lcs_ccw_driver);
2470 if (rc)
2471 goto ccw_err;
2472 lcs_group_driver.driver.groups = lcs_group_attr_groups;
2473 rc = ccwgroup_driver_register(&lcs_group_driver);
2474 if (rc)
2475 goto ccwgroup_err;
2476 return 0;
2477
2478 ccwgroup_err:
2479 ccw_driver_unregister(&lcs_ccw_driver);
2480 ccw_err:
2481 root_device_unregister(lcs_root_dev);
2482 register_err:
2483 lcs_unregister_debug_facility();
2484 out_err:
2485 pr_err("Initializing the lcs device driver failed\n");
2486 return rc;
2487 }
2488
2489
2490 /**
2491 * LCS module cleanup function
2492 */
2493 static void
2494 __exit lcs_cleanup_module(void)
2495 {
2496 pr_info("Terminating lcs module.\n");
2497 LCS_DBF_TEXT(0, trace, "cleanup");
2498 driver_remove_file(&lcs_group_driver.driver,
2499 &driver_attr_group);
2500 ccwgroup_driver_unregister(&lcs_group_driver);
2501 ccw_driver_unregister(&lcs_ccw_driver);
2502 root_device_unregister(lcs_root_dev);
2503 lcs_unregister_debug_facility();
2504 }
2505
2506 module_init(lcs_init_module);
2507 module_exit(lcs_cleanup_module);
2508
2509 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2510 MODULE_LICENSE("GPL");
2511
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