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x86/xen: resume timer irqs early
[linux/fpc-iii.git] / drivers / s390 / net / lcs.c
blobf404f55b31917a3daac4ea9787e130786ad6b3b8
1 /*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #define KMSG_COMPONENT "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/fddidevice.h>
34 #include <linux/inetdevice.h>
35 #include <linux/in.h>
36 #include <linux/igmp.h>
37 #include <linux/delay.h>
38 #include <linux/kthread.h>
39 #include <linux/slab.h>
40 #include <net/arp.h>
41 #include <net/ip.h>
42
43 #include <asm/debug.h>
44 #include <asm/idals.h>
45 #include <asm/timex.h>
46 #include <linux/device.h>
47 #include <asm/ccwgroup.h>
48
49 #include "lcs.h"
50
51
52 #if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
53 #error Cannot compile lcs.c without some net devices switched on.
54 #endif
55
56 /**
57 * initialization string for output
58 */
59
60 static char version[] __initdata = "LCS driver";
61
62 /**
63 * the root device for lcs group devices
64 */
65 static struct device *lcs_root_dev;
66
67 /**
68 * Some prototypes.
69 */
70 static void lcs_tasklet(unsigned long);
71 static void lcs_start_kernel_thread(struct work_struct *);
72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
73 #ifdef CONFIG_IP_MULTICAST
74 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
75 #endif /* CONFIG_IP_MULTICAST */
76 static int lcs_recovery(void *ptr);
77
78 /**
79 * Debug Facility Stuff
80 */
81 static char debug_buffer[255];
82 static debug_info_t *lcs_dbf_setup;
83 static debug_info_t *lcs_dbf_trace;
84
85 /**
86 * LCS Debug Facility functions
87 */
88 static void
89 lcs_unregister_debug_facility(void)
90 {
91 if (lcs_dbf_setup)
92 debug_unregister(lcs_dbf_setup);
93 if (lcs_dbf_trace)
94 debug_unregister(lcs_dbf_trace);
95 }
96
97 static int
98 lcs_register_debug_facility(void)
99 {
100 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
101 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
102 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
103 pr_err("Not enough memory for debug facility.\n");
104 lcs_unregister_debug_facility();
105 return -ENOMEM;
106 }
107 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
108 debug_set_level(lcs_dbf_setup, 2);
109 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
110 debug_set_level(lcs_dbf_trace, 2);
111 return 0;
112 }
113
114 /**
115 * Allocate io buffers.
116 */
117 static int
118 lcs_alloc_channel(struct lcs_channel *channel)
119 {
120 int cnt;
121
122 LCS_DBF_TEXT(2, setup, "ichalloc");
123 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
124 /* alloc memory fo iobuffer */
125 channel->iob[cnt].data =
126 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
127 if (channel->iob[cnt].data == NULL)
128 break;
129 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
130 }
131 if (cnt < LCS_NUM_BUFFS) {
132 /* Not all io buffers could be allocated. */
133 LCS_DBF_TEXT(2, setup, "echalloc");
134 while (cnt-- > 0)
135 kfree(channel->iob[cnt].data);
136 return -ENOMEM;
137 }
138 return 0;
139 }
140
141 /**
142 * Free io buffers.
143 */
144 static void
145 lcs_free_channel(struct lcs_channel *channel)
146 {
147 int cnt;
148
149 LCS_DBF_TEXT(2, setup, "ichfree");
150 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
151 kfree(channel->iob[cnt].data);
152 channel->iob[cnt].data = NULL;
153 }
154 }
155
156 /*
157 * Cleanup channel.
158 */
159 static void
160 lcs_cleanup_channel(struct lcs_channel *channel)
161 {
162 LCS_DBF_TEXT(3, setup, "cleanch");
163 /* Kill write channel tasklets. */
164 tasklet_kill(&channel->irq_tasklet);
165 /* Free channel buffers. */
166 lcs_free_channel(channel);
167 }
168
169 /**
170 * LCS free memory for card and channels.
171 */
172 static void
173 lcs_free_card(struct lcs_card *card)
174 {
175 LCS_DBF_TEXT(2, setup, "remcard");
176 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
177 kfree(card);
178 }
179
180 /**
181 * LCS alloc memory for card and channels
182 */
183 static struct lcs_card *
184 lcs_alloc_card(void)
185 {
186 struct lcs_card *card;
187 int rc;
188
189 LCS_DBF_TEXT(2, setup, "alloclcs");
190
191 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
192 if (card == NULL)
193 return NULL;
194 card->lan_type = LCS_FRAME_TYPE_AUTO;
195 card->pkt_seq = 0;
196 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
197 /* Allocate io buffers for the read channel. */
198 rc = lcs_alloc_channel(&card->read);
199 if (rc){
200 LCS_DBF_TEXT(2, setup, "iccwerr");
201 lcs_free_card(card);
202 return NULL;
203 }
204 /* Allocate io buffers for the write channel. */
205 rc = lcs_alloc_channel(&card->write);
206 if (rc) {
207 LCS_DBF_TEXT(2, setup, "iccwerr");
208 lcs_cleanup_channel(&card->read);
209 lcs_free_card(card);
210 return NULL;
211 }
212
213 #ifdef CONFIG_IP_MULTICAST
214 INIT_LIST_HEAD(&card->ipm_list);
215 #endif
216 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
217 return card;
218 }
219
220 /*
221 * Setup read channel.
222 */
223 static void
224 lcs_setup_read_ccws(struct lcs_card *card)
225 {
226 int cnt;
227
228 LCS_DBF_TEXT(2, setup, "ireadccw");
229 /* Setup read ccws. */
230 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
231 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
232 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
233 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
234 card->read.ccws[cnt].flags =
235 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
236 /*
237 * Note: we have allocated the buffer with GFP_DMA, so
238 * we do not need to do set_normalized_cda.
239 */
240 card->read.ccws[cnt].cda =
241 (__u32) __pa(card->read.iob[cnt].data);
242 ((struct lcs_header *)
243 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
244 card->read.iob[cnt].callback = lcs_get_frames_cb;
245 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
246 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
247 }
248 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
249 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
250 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
251 /* Last ccw is a tic (transfer in channel). */
252 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
253 card->read.ccws[LCS_NUM_BUFFS].cda =
254 (__u32) __pa(card->read.ccws);
255 /* Setg initial state of the read channel. */
256 card->read.state = LCS_CH_STATE_INIT;
257
258 card->read.io_idx = 0;
259 card->read.buf_idx = 0;
260 }
261
262 static void
263 lcs_setup_read(struct lcs_card *card)
264 {
265 LCS_DBF_TEXT(3, setup, "initread");
266
267 lcs_setup_read_ccws(card);
268 /* Initialize read channel tasklet. */
269 card->read.irq_tasklet.data = (unsigned long) &card->read;
270 card->read.irq_tasklet.func = lcs_tasklet;
271 /* Initialize waitqueue. */
272 init_waitqueue_head(&card->read.wait_q);
273 }
274
275 /*
276 * Setup write channel.
277 */
278 static void
279 lcs_setup_write_ccws(struct lcs_card *card)
280 {
281 int cnt;
282
283 LCS_DBF_TEXT(3, setup, "iwritccw");
284 /* Setup write ccws. */
285 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
286 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
287 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
288 card->write.ccws[cnt].count = 0;
289 card->write.ccws[cnt].flags =
290 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
291 /*
292 * Note: we have allocated the buffer with GFP_DMA, so
293 * we do not need to do set_normalized_cda.
294 */
295 card->write.ccws[cnt].cda =
296 (__u32) __pa(card->write.iob[cnt].data);
297 }
298 /* Last ccw is a tic (transfer in channel). */
299 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
300 card->write.ccws[LCS_NUM_BUFFS].cda =
301 (__u32) __pa(card->write.ccws);
302 /* Set initial state of the write channel. */
303 card->read.state = LCS_CH_STATE_INIT;
304
305 card->write.io_idx = 0;
306 card->write.buf_idx = 0;
307 }
308
309 static void
310 lcs_setup_write(struct lcs_card *card)
311 {
312 LCS_DBF_TEXT(3, setup, "initwrit");
313
314 lcs_setup_write_ccws(card);
315 /* Initialize write channel tasklet. */
316 card->write.irq_tasklet.data = (unsigned long) &card->write;
317 card->write.irq_tasklet.func = lcs_tasklet;
318 /* Initialize waitqueue. */
319 init_waitqueue_head(&card->write.wait_q);
320 }
321
322 static void
323 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
324 {
325 unsigned long flags;
326
327 spin_lock_irqsave(&card->mask_lock, flags);
328 card->thread_allowed_mask = threads;
329 spin_unlock_irqrestore(&card->mask_lock, flags);
330 wake_up(&card->wait_q);
331 }
332 static inline int
333 lcs_threads_running(struct lcs_card *card, unsigned long threads)
334 {
335 unsigned long flags;
336 int rc = 0;
337
338 spin_lock_irqsave(&card->mask_lock, flags);
339 rc = (card->thread_running_mask & threads);
340 spin_unlock_irqrestore(&card->mask_lock, flags);
341 return rc;
342 }
343
344 static int
345 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
346 {
347 return wait_event_interruptible(card->wait_q,
348 lcs_threads_running(card, threads) == 0);
349 }
350
351 static inline int
352 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
353 {
354 unsigned long flags;
355
356 spin_lock_irqsave(&card->mask_lock, flags);
357 if ( !(card->thread_allowed_mask & thread) ||
358 (card->thread_start_mask & thread) ) {
359 spin_unlock_irqrestore(&card->mask_lock, flags);
360 return -EPERM;
361 }
362 card->thread_start_mask |= thread;
363 spin_unlock_irqrestore(&card->mask_lock, flags);
364 return 0;
365 }
366
367 static void
368 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
369 {
370 unsigned long flags;
371
372 spin_lock_irqsave(&card->mask_lock, flags);
373 card->thread_running_mask &= ~thread;
374 spin_unlock_irqrestore(&card->mask_lock, flags);
375 wake_up(&card->wait_q);
376 }
377
378 static inline int
379 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
380 {
381 unsigned long flags;
382 int rc = 0;
383
384 spin_lock_irqsave(&card->mask_lock, flags);
385 if (card->thread_start_mask & thread){
386 if ((card->thread_allowed_mask & thread) &&
387 !(card->thread_running_mask & thread)){
388 rc = 1;
389 card->thread_start_mask &= ~thread;
390 card->thread_running_mask |= thread;
391 } else
392 rc = -EPERM;
393 }
394 spin_unlock_irqrestore(&card->mask_lock, flags);
395 return rc;
396 }
397
398 static int
399 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
400 {
401 int rc = 0;
402 wait_event(card->wait_q,
403 (rc = __lcs_do_run_thread(card, thread)) >= 0);
404 return rc;
405 }
406
407 static int
408 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
409 {
410 unsigned long flags;
411 int rc = 0;
412
413 spin_lock_irqsave(&card->mask_lock, flags);
414 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
415 (u8) card->thread_start_mask,
416 (u8) card->thread_allowed_mask,
417 (u8) card->thread_running_mask);
418 rc = (card->thread_start_mask & thread);
419 spin_unlock_irqrestore(&card->mask_lock, flags);
420 return rc;
421 }
422
423 /**
424 * Initialize channels,card and state machines.
425 */
426 static void
427 lcs_setup_card(struct lcs_card *card)
428 {
429 LCS_DBF_TEXT(2, setup, "initcard");
430 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
431
432 lcs_setup_read(card);
433 lcs_setup_write(card);
434 /* Set cards initial state. */
435 card->state = DEV_STATE_DOWN;
436 card->tx_buffer = NULL;
437 card->tx_emitted = 0;
438
439 init_waitqueue_head(&card->wait_q);
440 spin_lock_init(&card->lock);
441 spin_lock_init(&card->ipm_lock);
442 spin_lock_init(&card->mask_lock);
443 #ifdef CONFIG_IP_MULTICAST
444 INIT_LIST_HEAD(&card->ipm_list);
445 #endif
446 INIT_LIST_HEAD(&card->lancmd_waiters);
447 }
448
449 static inline void
450 lcs_clear_multicast_list(struct lcs_card *card)
451 {
452 #ifdef CONFIG_IP_MULTICAST
453 struct lcs_ipm_list *ipm;
454 unsigned long flags;
455
456 /* Free multicast list. */
457 LCS_DBF_TEXT(3, setup, "clmclist");
458 spin_lock_irqsave(&card->ipm_lock, flags);
459 while (!list_empty(&card->ipm_list)){
460 ipm = list_entry(card->ipm_list.next,
461 struct lcs_ipm_list, list);
462 list_del(&ipm->list);
463 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
464 spin_unlock_irqrestore(&card->ipm_lock, flags);
465 lcs_send_delipm(card, ipm);
466 spin_lock_irqsave(&card->ipm_lock, flags);
467 }
468 kfree(ipm);
469 }
470 spin_unlock_irqrestore(&card->ipm_lock, flags);
471 #endif
472 }
473 /**
474 * Cleanup channels,card and state machines.
475 */
476 static void
477 lcs_cleanup_card(struct lcs_card *card)
478 {
479
480 LCS_DBF_TEXT(3, setup, "cleancrd");
481 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
482
483 if (card->dev != NULL)
484 free_netdev(card->dev);
485 /* Cleanup channels. */
486 lcs_cleanup_channel(&card->write);
487 lcs_cleanup_channel(&card->read);
488 }
489
490 /**
491 * Start channel.
492 */
493 static int
494 lcs_start_channel(struct lcs_channel *channel)
495 {
496 unsigned long flags;
497 int rc;
498
499 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
500 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
501 rc = ccw_device_start(channel->ccwdev,
502 channel->ccws + channel->io_idx, 0, 0,
503 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
504 if (rc == 0)
505 channel->state = LCS_CH_STATE_RUNNING;
506 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
507 if (rc) {
508 LCS_DBF_TEXT_(4,trace,"essh%s",
509 dev_name(&channel->ccwdev->dev));
510 dev_err(&channel->ccwdev->dev,
511 "Starting an LCS device resulted in an error,"
512 " rc=%d!\n", rc);
513 }
514 return rc;
515 }
516
517 static int
518 lcs_clear_channel(struct lcs_channel *channel)
519 {
520 unsigned long flags;
521 int rc;
522
523 LCS_DBF_TEXT(4,trace,"clearch");
524 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
525 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
526 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
527 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
528 if (rc) {
529 LCS_DBF_TEXT_(4, trace, "ecsc%s",
530 dev_name(&channel->ccwdev->dev));
531 return rc;
532 }
533 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
534 channel->state = LCS_CH_STATE_STOPPED;
535 return rc;
536 }
537
538
539 /**
540 * Stop channel.
541 */
542 static int
543 lcs_stop_channel(struct lcs_channel *channel)
544 {
545 unsigned long flags;
546 int rc;
547
548 if (channel->state == LCS_CH_STATE_STOPPED)
549 return 0;
550 LCS_DBF_TEXT(4,trace,"haltsch");
551 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
552 channel->state = LCS_CH_STATE_INIT;
553 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
554 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
555 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
556 if (rc) {
557 LCS_DBF_TEXT_(4, trace, "ehsc%s",
558 dev_name(&channel->ccwdev->dev));
559 return rc;
560 }
561 /* Asynchronous halt initialted. Wait for its completion. */
562 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
563 lcs_clear_channel(channel);
564 return 0;
565 }
566
567 /**
568 * start read and write channel
569 */
570 static int
571 lcs_start_channels(struct lcs_card *card)
572 {
573 int rc;
574
575 LCS_DBF_TEXT(2, trace, "chstart");
576 /* start read channel */
577 rc = lcs_start_channel(&card->read);
578 if (rc)
579 return rc;
580 /* start write channel */
581 rc = lcs_start_channel(&card->write);
582 if (rc)
583 lcs_stop_channel(&card->read);
584 return rc;
585 }
586
587 /**
588 * stop read and write channel
589 */
590 static int
591 lcs_stop_channels(struct lcs_card *card)
592 {
593 LCS_DBF_TEXT(2, trace, "chhalt");
594 lcs_stop_channel(&card->read);
595 lcs_stop_channel(&card->write);
596 return 0;
597 }
598
599 /**
600 * Get empty buffer.
601 */
602 static struct lcs_buffer *
603 __lcs_get_buffer(struct lcs_channel *channel)
604 {
605 int index;
606
607 LCS_DBF_TEXT(5, trace, "_getbuff");
608 index = channel->io_idx;
609 do {
610 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
611 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
612 return channel->iob + index;
613 }
614 index = (index + 1) & (LCS_NUM_BUFFS - 1);
615 } while (index != channel->io_idx);
616 return NULL;
617 }
618
619 static struct lcs_buffer *
620 lcs_get_buffer(struct lcs_channel *channel)
621 {
622 struct lcs_buffer *buffer;
623 unsigned long flags;
624
625 LCS_DBF_TEXT(5, trace, "getbuff");
626 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
627 buffer = __lcs_get_buffer(channel);
628 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
629 return buffer;
630 }
631
632 /**
633 * Resume channel program if the channel is suspended.
634 */
635 static int
636 __lcs_resume_channel(struct lcs_channel *channel)
637 {
638 int rc;
639
640 if (channel->state != LCS_CH_STATE_SUSPENDED)
641 return 0;
642 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
643 return 0;
644 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
645 rc = ccw_device_resume(channel->ccwdev);
646 if (rc) {
647 LCS_DBF_TEXT_(4, trace, "ersc%s",
648 dev_name(&channel->ccwdev->dev));
649 dev_err(&channel->ccwdev->dev,
650 "Sending data from the LCS device to the LAN failed"
651 " with rc=%d\n",rc);
652 } else
653 channel->state = LCS_CH_STATE_RUNNING;
654 return rc;
655
656 }
657
658 /**
659 * Make a buffer ready for processing.
660 */
661 static inline void
662 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
663 {
664 int prev, next;
665
666 LCS_DBF_TEXT(5, trace, "rdybits");
667 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
668 next = (index + 1) & (LCS_NUM_BUFFS - 1);
669 /* Check if we may clear the suspend bit of this buffer. */
670 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
671 /* Check if we have to set the PCI bit. */
672 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
673 /* Suspend bit of the previous buffer is not set. */
674 channel->ccws[index].flags |= CCW_FLAG_PCI;
675 /* Suspend bit of the next buffer is set. */
676 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
677 }
678 }
679
680 static int
681 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
682 {
683 unsigned long flags;
684 int index, rc;
685
686 LCS_DBF_TEXT(5, trace, "rdybuff");
687 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
688 buffer->state != LCS_BUF_STATE_PROCESSED);
689 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
690 buffer->state = LCS_BUF_STATE_READY;
691 index = buffer - channel->iob;
692 /* Set length. */
693 channel->ccws[index].count = buffer->count;
694 /* Check relevant PCI/suspend bits. */
695 __lcs_ready_buffer_bits(channel, index);
696 rc = __lcs_resume_channel(channel);
697 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
698 return rc;
699 }
700
701 /**
702 * Mark the buffer as processed. Take care of the suspend bit
703 * of the previous buffer. This function is called from
704 * interrupt context, so the lock must not be taken.
705 */
706 static int
707 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
708 {
709 int index, prev, next;
710
711 LCS_DBF_TEXT(5, trace, "prcsbuff");
712 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
713 buffer->state = LCS_BUF_STATE_PROCESSED;
714 index = buffer - channel->iob;
715 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
716 next = (index + 1) & (LCS_NUM_BUFFS - 1);
717 /* Set the suspend bit and clear the PCI bit of this buffer. */
718 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
719 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
720 /* Check the suspend bit of the previous buffer. */
721 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
722 /*
723 * Previous buffer is in state ready. It might have
724 * happened in lcs_ready_buffer that the suspend bit
725 * has not been cleared to avoid an endless loop.
726 * Do it now.
727 */
728 __lcs_ready_buffer_bits(channel, prev);
729 }
730 /* Clear PCI bit of next buffer. */
731 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
732 return __lcs_resume_channel(channel);
733 }
734
735 /**
736 * Put a processed buffer back to state empty.
737 */
738 static void
739 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
740 {
741 unsigned long flags;
742
743 LCS_DBF_TEXT(5, trace, "relbuff");
744 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
745 buffer->state != LCS_BUF_STATE_PROCESSED);
746 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
747 buffer->state = LCS_BUF_STATE_EMPTY;
748 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
749 }
750
751 /**
752 * Get buffer for a lan command.
753 */
754 static struct lcs_buffer *
755 lcs_get_lancmd(struct lcs_card *card, int count)
756 {
757 struct lcs_buffer *buffer;
758 struct lcs_cmd *cmd;
759
760 LCS_DBF_TEXT(4, trace, "getlncmd");
761 /* Get buffer and wait if none is available. */
762 wait_event(card->write.wait_q,
763 ((buffer = lcs_get_buffer(&card->write)) != NULL));
764 count += sizeof(struct lcs_header);
765 *(__u16 *)(buffer->data + count) = 0;
766 buffer->count = count + sizeof(__u16);
767 buffer->callback = lcs_release_buffer;
768 cmd = (struct lcs_cmd *) buffer->data;
769 cmd->offset = count;
770 cmd->type = LCS_FRAME_TYPE_CONTROL;
771 cmd->slot = 0;
772 return buffer;
773 }
774
775
776 static void
777 lcs_get_reply(struct lcs_reply *reply)
778 {
779 WARN_ON(atomic_read(&reply->refcnt) <= 0);
780 atomic_inc(&reply->refcnt);
781 }
782
783 static void
784 lcs_put_reply(struct lcs_reply *reply)
785 {
786 WARN_ON(atomic_read(&reply->refcnt) <= 0);
787 if (atomic_dec_and_test(&reply->refcnt)) {
788 kfree(reply);
789 }
790
791 }
792
793 static struct lcs_reply *
794 lcs_alloc_reply(struct lcs_cmd *cmd)
795 {
796 struct lcs_reply *reply;
797
798 LCS_DBF_TEXT(4, trace, "getreply");
799
800 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
801 if (!reply)
802 return NULL;
803 atomic_set(&reply->refcnt,1);
804 reply->sequence_no = cmd->sequence_no;
805 reply->received = 0;
806 reply->rc = 0;
807 init_waitqueue_head(&reply->wait_q);
808
809 return reply;
810 }
811
812 /**
813 * Notifier function for lancmd replies. Called from read irq.
814 */
815 static void
816 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
817 {
818 struct list_head *l, *n;
819 struct lcs_reply *reply;
820
821 LCS_DBF_TEXT(4, trace, "notiwait");
822 spin_lock(&card->lock);
823 list_for_each_safe(l, n, &card->lancmd_waiters) {
824 reply = list_entry(l, struct lcs_reply, list);
825 if (reply->sequence_no == cmd->sequence_no) {
826 lcs_get_reply(reply);
827 list_del_init(&reply->list);
828 if (reply->callback != NULL)
829 reply->callback(card, cmd);
830 reply->received = 1;
831 reply->rc = cmd->return_code;
832 wake_up(&reply->wait_q);
833 lcs_put_reply(reply);
834 break;
835 }
836 }
837 spin_unlock(&card->lock);
838 }
839
840 /**
841 * Emit buffer of a lan command.
842 */
843 static void
844 lcs_lancmd_timeout(unsigned long data)
845 {
846 struct lcs_reply *reply, *list_reply, *r;
847 unsigned long flags;
848
849 LCS_DBF_TEXT(4, trace, "timeout");
850 reply = (struct lcs_reply *) data;
851 spin_lock_irqsave(&reply->card->lock, flags);
852 list_for_each_entry_safe(list_reply, r,
853 &reply->card->lancmd_waiters,list) {
854 if (reply == list_reply) {
855 lcs_get_reply(reply);
856 list_del_init(&reply->list);
857 spin_unlock_irqrestore(&reply->card->lock, flags);
858 reply->received = 1;
859 reply->rc = -ETIME;
860 wake_up(&reply->wait_q);
861 lcs_put_reply(reply);
862 return;
863 }
864 }
865 spin_unlock_irqrestore(&reply->card->lock, flags);
866 }
867
868 static int
869 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
870 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
871 {
872 struct lcs_reply *reply;
873 struct lcs_cmd *cmd;
874 struct timer_list timer;
875 unsigned long flags;
876 int rc;
877
878 LCS_DBF_TEXT(4, trace, "sendcmd");
879 cmd = (struct lcs_cmd *) buffer->data;
880 cmd->return_code = 0;
881 cmd->sequence_no = card->sequence_no++;
882 reply = lcs_alloc_reply(cmd);
883 if (!reply)
884 return -ENOMEM;
885 reply->callback = reply_callback;
886 reply->card = card;
887 spin_lock_irqsave(&card->lock, flags);
888 list_add_tail(&reply->list, &card->lancmd_waiters);
889 spin_unlock_irqrestore(&card->lock, flags);
890
891 buffer->callback = lcs_release_buffer;
892 rc = lcs_ready_buffer(&card->write, buffer);
893 if (rc)
894 return rc;
895 init_timer_on_stack(&timer);
896 timer.function = lcs_lancmd_timeout;
897 timer.data = (unsigned long) reply;
898 timer.expires = jiffies + HZ*card->lancmd_timeout;
899 add_timer(&timer);
900 wait_event(reply->wait_q, reply->received);
901 del_timer_sync(&timer);
902 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
903 rc = reply->rc;
904 lcs_put_reply(reply);
905 return rc ? -EIO : 0;
906 }
907
908 /**
909 * LCS startup command
910 */
911 static int
912 lcs_send_startup(struct lcs_card *card, __u8 initiator)
913 {
914 struct lcs_buffer *buffer;
915 struct lcs_cmd *cmd;
916
917 LCS_DBF_TEXT(2, trace, "startup");
918 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
919 cmd = (struct lcs_cmd *) buffer->data;
920 cmd->cmd_code = LCS_CMD_STARTUP;
921 cmd->initiator = initiator;
922 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
923 return lcs_send_lancmd(card, buffer, NULL);
924 }
925
926 /**
927 * LCS shutdown command
928 */
929 static int
930 lcs_send_shutdown(struct lcs_card *card)
931 {
932 struct lcs_buffer *buffer;
933 struct lcs_cmd *cmd;
934
935 LCS_DBF_TEXT(2, trace, "shutdown");
936 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
937 cmd = (struct lcs_cmd *) buffer->data;
938 cmd->cmd_code = LCS_CMD_SHUTDOWN;
939 cmd->initiator = LCS_INITIATOR_TCPIP;
940 return lcs_send_lancmd(card, buffer, NULL);
941 }
942
943 /**
944 * LCS lanstat command
945 */
946 static void
947 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
948 {
949 LCS_DBF_TEXT(2, trace, "statcb");
950 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
951 }
952
953 static int
954 lcs_send_lanstat(struct lcs_card *card)
955 {
956 struct lcs_buffer *buffer;
957 struct lcs_cmd *cmd;
958
959 LCS_DBF_TEXT(2,trace, "cmdstat");
960 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
961 cmd = (struct lcs_cmd *) buffer->data;
962 /* Setup lanstat command. */
963 cmd->cmd_code = LCS_CMD_LANSTAT;
964 cmd->initiator = LCS_INITIATOR_TCPIP;
965 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
966 cmd->cmd.lcs_std_cmd.portno = card->portno;
967 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
968 }
969
970 /**
971 * send stoplan command
972 */
973 static int
974 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
975 {
976 struct lcs_buffer *buffer;
977 struct lcs_cmd *cmd;
978
979 LCS_DBF_TEXT(2, trace, "cmdstpln");
980 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
981 cmd = (struct lcs_cmd *) buffer->data;
982 cmd->cmd_code = LCS_CMD_STOPLAN;
983 cmd->initiator = initiator;
984 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
985 cmd->cmd.lcs_std_cmd.portno = card->portno;
986 return lcs_send_lancmd(card, buffer, NULL);
987 }
988
989 /**
990 * send startlan command
991 */
992 static void
993 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
994 {
995 LCS_DBF_TEXT(2, trace, "srtlancb");
996 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
997 card->portno = cmd->cmd.lcs_std_cmd.portno;
998 }
999
1000 static int
1001 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1002 {
1003 struct lcs_buffer *buffer;
1004 struct lcs_cmd *cmd;
1005
1006 LCS_DBF_TEXT(2, trace, "cmdstaln");
1007 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1008 cmd = (struct lcs_cmd *) buffer->data;
1009 cmd->cmd_code = LCS_CMD_STARTLAN;
1010 cmd->initiator = initiator;
1011 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1012 cmd->cmd.lcs_std_cmd.portno = card->portno;
1013 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /**
1018 * send setipm command (Multicast)
1019 */
1020 static int
1021 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1022 {
1023 struct lcs_buffer *buffer;
1024 struct lcs_cmd *cmd;
1025
1026 LCS_DBF_TEXT(2, trace, "cmdsetim");
1027 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1028 cmd = (struct lcs_cmd *) buffer->data;
1029 cmd->cmd_code = LCS_CMD_SETIPM;
1030 cmd->initiator = LCS_INITIATOR_TCPIP;
1031 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1032 cmd->cmd.lcs_qipassist.portno = card->portno;
1033 cmd->cmd.lcs_qipassist.version = 4;
1034 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1035 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1036 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1037 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1038 return lcs_send_lancmd(card, buffer, NULL);
1039 }
1040
1041 /**
1042 * send delipm command (Multicast)
1043 */
1044 static int
1045 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1046 {
1047 struct lcs_buffer *buffer;
1048 struct lcs_cmd *cmd;
1049
1050 LCS_DBF_TEXT(2, trace, "cmddelim");
1051 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1052 cmd = (struct lcs_cmd *) buffer->data;
1053 cmd->cmd_code = LCS_CMD_DELIPM;
1054 cmd->initiator = LCS_INITIATOR_TCPIP;
1055 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1056 cmd->cmd.lcs_qipassist.portno = card->portno;
1057 cmd->cmd.lcs_qipassist.version = 4;
1058 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1059 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1060 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1061 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1062 return lcs_send_lancmd(card, buffer, NULL);
1063 }
1064
1065 /**
1066 * check if multicast is supported by LCS
1067 */
1068 static void
1069 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1070 {
1071 LCS_DBF_TEXT(2, trace, "chkmccb");
1072 card->ip_assists_supported =
1073 cmd->cmd.lcs_qipassist.ip_assists_supported;
1074 card->ip_assists_enabled =
1075 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1076 }
1077
1078 static int
1079 lcs_check_multicast_support(struct lcs_card *card)
1080 {
1081 struct lcs_buffer *buffer;
1082 struct lcs_cmd *cmd;
1083 int rc;
1084
1085 LCS_DBF_TEXT(2, trace, "cmdqipa");
1086 /* Send query ipassist. */
1087 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1088 cmd = (struct lcs_cmd *) buffer->data;
1089 cmd->cmd_code = LCS_CMD_QIPASSIST;
1090 cmd->initiator = LCS_INITIATOR_TCPIP;
1091 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1092 cmd->cmd.lcs_qipassist.portno = card->portno;
1093 cmd->cmd.lcs_qipassist.version = 4;
1094 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1095 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1096 if (rc != 0) {
1097 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1098 return -EOPNOTSUPP;
1099 }
1100 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1101 return 0;
1102 return -EOPNOTSUPP;
1103 }
1104
1105 /**
1106 * set or del multicast address on LCS card
1107 */
1108 static void
1109 lcs_fix_multicast_list(struct lcs_card *card)
1110 {
1111 struct list_head failed_list;
1112 struct lcs_ipm_list *ipm, *tmp;
1113 unsigned long flags;
1114 int rc;
1115
1116 LCS_DBF_TEXT(4,trace, "fixipm");
1117 INIT_LIST_HEAD(&failed_list);
1118 spin_lock_irqsave(&card->ipm_lock, flags);
1119 list_modified:
1120 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1121 switch (ipm->ipm_state) {
1122 case LCS_IPM_STATE_SET_REQUIRED:
1123 /* del from ipm_list so no one else can tamper with
1124 * this entry */
1125 list_del_init(&ipm->list);
1126 spin_unlock_irqrestore(&card->ipm_lock, flags);
1127 rc = lcs_send_setipm(card, ipm);
1128 spin_lock_irqsave(&card->ipm_lock, flags);
1129 if (rc) {
1130 pr_info("Adding multicast address failed."
1131 " Table possibly full!\n");
1132 /* store ipm in failed list -> will be added
1133 * to ipm_list again, so a retry will be done
1134 * during the next call of this function */
1135 list_add_tail(&ipm->list, &failed_list);
1136 } else {
1137 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1138 /* re-insert into ipm_list */
1139 list_add_tail(&ipm->list, &card->ipm_list);
1140 }
1141 goto list_modified;
1142 case LCS_IPM_STATE_DEL_REQUIRED:
1143 list_del(&ipm->list);
1144 spin_unlock_irqrestore(&card->ipm_lock, flags);
1145 lcs_send_delipm(card, ipm);
1146 spin_lock_irqsave(&card->ipm_lock, flags);
1147 kfree(ipm);
1148 goto list_modified;
1149 case LCS_IPM_STATE_ON_CARD:
1150 break;
1151 }
1152 }
1153 /* re-insert all entries from the failed_list into ipm_list */
1154 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1155 list_move_tail(&ipm->list, &card->ipm_list);
1156
1157 spin_unlock_irqrestore(&card->ipm_lock, flags);
1158 }
1159
1160 /**
1161 * get mac address for the relevant Multicast address
1162 */
1163 static void
1164 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1165 {
1166 LCS_DBF_TEXT(4,trace, "getmac");
1167 ip_eth_mc_map(ipm, mac);
1168 }
1169
1170 /**
1171 * function called by net device to handle multicast address relevant things
1172 */
1173 static inline void
1174 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1175 {
1176 struct ip_mc_list *im4;
1177 struct list_head *l;
1178 struct lcs_ipm_list *ipm;
1179 unsigned long flags;
1180 char buf[MAX_ADDR_LEN];
1181
1182 LCS_DBF_TEXT(4, trace, "remmclst");
1183 spin_lock_irqsave(&card->ipm_lock, flags);
1184 list_for_each(l, &card->ipm_list) {
1185 ipm = list_entry(l, struct lcs_ipm_list, list);
1186 for (im4 = rcu_dereference(in4_dev->mc_list);
1187 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1188 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1189 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1190 (memcmp(buf, &ipm->ipm.mac_addr,
1191 LCS_MAC_LENGTH) == 0) )
1192 break;
1193 }
1194 if (im4 == NULL)
1195 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1196 }
1197 spin_unlock_irqrestore(&card->ipm_lock, flags);
1198 }
1199
1200 static inline struct lcs_ipm_list *
1201 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1202 {
1203 struct lcs_ipm_list *tmp, *ipm = NULL;
1204 struct list_head *l;
1205 unsigned long flags;
1206
1207 LCS_DBF_TEXT(4, trace, "chkmcent");
1208 spin_lock_irqsave(&card->ipm_lock, flags);
1209 list_for_each(l, &card->ipm_list) {
1210 tmp = list_entry(l, struct lcs_ipm_list, list);
1211 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1212 (memcmp(buf, &tmp->ipm.mac_addr,
1213 LCS_MAC_LENGTH) == 0) ) {
1214 ipm = tmp;
1215 break;
1216 }
1217 }
1218 spin_unlock_irqrestore(&card->ipm_lock, flags);
1219 return ipm;
1220 }
1221
1222 static inline void
1223 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1224 {
1225
1226 struct ip_mc_list *im4;
1227 struct lcs_ipm_list *ipm;
1228 char buf[MAX_ADDR_LEN];
1229 unsigned long flags;
1230
1231 LCS_DBF_TEXT(4, trace, "setmclst");
1232 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1233 im4 = rcu_dereference(im4->next_rcu)) {
1234 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1235 ipm = lcs_check_addr_entry(card, im4, buf);
1236 if (ipm != NULL)
1237 continue; /* Address already in list. */
1238 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1239 if (ipm == NULL) {
1240 pr_info("Not enough memory to add"
1241 " new multicast entry!\n");
1242 break;
1243 }
1244 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1245 ipm->ipm.ip_addr = im4->multiaddr;
1246 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1247 spin_lock_irqsave(&card->ipm_lock, flags);
1248 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1249 list_add(&ipm->list, &card->ipm_list);
1250 spin_unlock_irqrestore(&card->ipm_lock, flags);
1251 }
1252 }
1253
1254 static int
1255 lcs_register_mc_addresses(void *data)
1256 {
1257 struct lcs_card *card;
1258 struct in_device *in4_dev;
1259
1260 card = (struct lcs_card *) data;
1261
1262 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1263 return 0;
1264 LCS_DBF_TEXT(4, trace, "regmulti");
1265
1266 in4_dev = in_dev_get(card->dev);
1267 if (in4_dev == NULL)
1268 goto out;
1269 rcu_read_lock();
1270 lcs_remove_mc_addresses(card,in4_dev);
1271 lcs_set_mc_addresses(card, in4_dev);
1272 rcu_read_unlock();
1273 in_dev_put(in4_dev);
1274
1275 netif_carrier_off(card->dev);
1276 netif_tx_disable(card->dev);
1277 wait_event(card->write.wait_q,
1278 (card->write.state != LCS_CH_STATE_RUNNING));
1279 lcs_fix_multicast_list(card);
1280 if (card->state == DEV_STATE_UP) {
1281 netif_carrier_on(card->dev);
1282 netif_wake_queue(card->dev);
1283 }
1284 out:
1285 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1286 return 0;
1287 }
1288 #endif /* CONFIG_IP_MULTICAST */
1289
1290 /**
1291 * function called by net device to
1292 * handle multicast address relevant things
1293 */
1294 static void
1295 lcs_set_multicast_list(struct net_device *dev)
1296 {
1297 #ifdef CONFIG_IP_MULTICAST
1298 struct lcs_card *card;
1299
1300 LCS_DBF_TEXT(4, trace, "setmulti");
1301 card = (struct lcs_card *) dev->ml_priv;
1302
1303 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1304 schedule_work(&card->kernel_thread_starter);
1305 #endif /* CONFIG_IP_MULTICAST */
1306 }
1307
1308 static long
1309 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1310 {
1311 if (!IS_ERR(irb))
1312 return 0;
1313
1314 switch (PTR_ERR(irb)) {
1315 case -EIO:
1316 dev_warn(&cdev->dev,
1317 "An I/O-error occurred on the LCS device\n");
1318 LCS_DBF_TEXT(2, trace, "ckirberr");
1319 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1320 break;
1321 case -ETIMEDOUT:
1322 dev_warn(&cdev->dev,
1323 "A command timed out on the LCS device\n");
1324 LCS_DBF_TEXT(2, trace, "ckirberr");
1325 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1326 break;
1327 default:
1328 dev_warn(&cdev->dev,
1329 "An error occurred on the LCS device, rc=%ld\n",
1330 PTR_ERR(irb));
1331 LCS_DBF_TEXT(2, trace, "ckirberr");
1332 LCS_DBF_TEXT(2, trace, " rc???");
1333 }
1334 return PTR_ERR(irb);
1335 }
1336
1337 static int
1338 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1339 {
1340 int dstat, cstat;
1341 char *sense;
1342
1343 sense = (char *) irb->ecw;
1344 cstat = irb->scsw.cmd.cstat;
1345 dstat = irb->scsw.cmd.dstat;
1346
1347 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1348 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1349 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1350 LCS_DBF_TEXT(2, trace, "CGENCHK");
1351 return 1;
1352 }
1353 if (dstat & DEV_STAT_UNIT_CHECK) {
1354 if (sense[LCS_SENSE_BYTE_1] &
1355 LCS_SENSE_RESETTING_EVENT) {
1356 LCS_DBF_TEXT(2, trace, "REVIND");
1357 return 1;
1358 }
1359 if (sense[LCS_SENSE_BYTE_0] &
1360 LCS_SENSE_CMD_REJECT) {
1361 LCS_DBF_TEXT(2, trace, "CMDREJ");
1362 return 0;
1363 }
1364 if ((!sense[LCS_SENSE_BYTE_0]) &&
1365 (!sense[LCS_SENSE_BYTE_1]) &&
1366 (!sense[LCS_SENSE_BYTE_2]) &&
1367 (!sense[LCS_SENSE_BYTE_3])) {
1368 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1369 return 0;
1370 }
1371 LCS_DBF_TEXT(2, trace, "DGENCHK");
1372 return 1;
1373 }
1374 return 0;
1375 }
1376
1377 static void
1378 lcs_schedule_recovery(struct lcs_card *card)
1379 {
1380 LCS_DBF_TEXT(2, trace, "startrec");
1381 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1382 schedule_work(&card->kernel_thread_starter);
1383 }
1384
1385 /**
1386 * IRQ Handler for LCS channels
1387 */
1388 static void
1389 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1390 {
1391 struct lcs_card *card;
1392 struct lcs_channel *channel;
1393 int rc, index;
1394 int cstat, dstat;
1395
1396 if (lcs_check_irb_error(cdev, irb))
1397 return;
1398
1399 card = CARD_FROM_DEV(cdev);
1400 if (card->read.ccwdev == cdev)
1401 channel = &card->read;
1402 else
1403 channel = &card->write;
1404
1405 cstat = irb->scsw.cmd.cstat;
1406 dstat = irb->scsw.cmd.dstat;
1407 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1408 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1409 irb->scsw.cmd.dstat);
1410 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1411 irb->scsw.cmd.actl);
1412
1413 /* Check for channel and device errors presented */
1414 rc = lcs_get_problem(cdev, irb);
1415 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1416 dev_warn(&cdev->dev,
1417 "The LCS device stopped because of an error,"
1418 " dstat=0x%X, cstat=0x%X \n",
1419 dstat, cstat);
1420 if (rc) {
1421 channel->state = LCS_CH_STATE_ERROR;
1422 }
1423 }
1424 if (channel->state == LCS_CH_STATE_ERROR) {
1425 lcs_schedule_recovery(card);
1426 wake_up(&card->wait_q);
1427 return;
1428 }
1429 /* How far in the ccw chain have we processed? */
1430 if ((channel->state != LCS_CH_STATE_INIT) &&
1431 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1432 (irb->scsw.cmd.cpa != 0)) {
1433 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1434 - channel->ccws;
1435 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1436 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1437 /* Bloody io subsystem tells us lies about cpa... */
1438 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1439 while (channel->io_idx != index) {
1440 __lcs_processed_buffer(channel,
1441 channel->iob + channel->io_idx);
1442 channel->io_idx =
1443 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1444 }
1445 }
1446
1447 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1448 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1449 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1450 /* Mark channel as stopped. */
1451 channel->state = LCS_CH_STATE_STOPPED;
1452 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1453 /* CCW execution stopped on a suspend bit. */
1454 channel->state = LCS_CH_STATE_SUSPENDED;
1455 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1456 if (irb->scsw.cmd.cc != 0) {
1457 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1458 return;
1459 }
1460 /* The channel has been stopped by halt_IO. */
1461 channel->state = LCS_CH_STATE_HALTED;
1462 }
1463 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1464 channel->state = LCS_CH_STATE_CLEARED;
1465 /* Do the rest in the tasklet. */
1466 tasklet_schedule(&channel->irq_tasklet);
1467 }
1468
1469 /**
1470 * Tasklet for IRQ handler
1471 */
1472 static void
1473 lcs_tasklet(unsigned long data)
1474 {
1475 unsigned long flags;
1476 struct lcs_channel *channel;
1477 struct lcs_buffer *iob;
1478 int buf_idx;
1479
1480 channel = (struct lcs_channel *) data;
1481 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1482
1483 /* Check for processed buffers. */
1484 iob = channel->iob;
1485 buf_idx = channel->buf_idx;
1486 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1487 /* Do the callback thing. */
1488 if (iob[buf_idx].callback != NULL)
1489 iob[buf_idx].callback(channel, iob + buf_idx);
1490 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1491 }
1492 channel->buf_idx = buf_idx;
1493
1494 if (channel->state == LCS_CH_STATE_STOPPED)
1495 lcs_start_channel(channel);
1496 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1497 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1498 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1499 __lcs_resume_channel(channel);
1500 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1501
1502 /* Something happened on the channel. Wake up waiters. */
1503 wake_up(&channel->wait_q);
1504 }
1505
1506 /**
1507 * Finish current tx buffer and make it ready for transmit.
1508 */
1509 static void
1510 __lcs_emit_txbuffer(struct lcs_card *card)
1511 {
1512 LCS_DBF_TEXT(5, trace, "emittx");
1513 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1514 card->tx_buffer->count += 2;
1515 lcs_ready_buffer(&card->write, card->tx_buffer);
1516 card->tx_buffer = NULL;
1517 card->tx_emitted++;
1518 }
1519
1520 /**
1521 * Callback for finished tx buffers.
1522 */
1523 static void
1524 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1525 {
1526 struct lcs_card *card;
1527
1528 LCS_DBF_TEXT(5, trace, "txbuffcb");
1529 /* Put buffer back to pool. */
1530 lcs_release_buffer(channel, buffer);
1531 card = container_of(channel, struct lcs_card, write);
1532 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1533 netif_wake_queue(card->dev);
1534 spin_lock(&card->lock);
1535 card->tx_emitted--;
1536 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1537 /*
1538 * Last running tx buffer has finished. Submit partially
1539 * filled current buffer.
1540 */
1541 __lcs_emit_txbuffer(card);
1542 spin_unlock(&card->lock);
1543 }
1544
1545 /**
1546 * Packet transmit function called by network stack
1547 */
1548 static int
1549 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1550 struct net_device *dev)
1551 {
1552 struct lcs_header *header;
1553 int rc = NETDEV_TX_OK;
1554
1555 LCS_DBF_TEXT(5, trace, "hardxmit");
1556 if (skb == NULL) {
1557 card->stats.tx_dropped++;
1558 card->stats.tx_errors++;
1559 return NETDEV_TX_OK;
1560 }
1561 if (card->state != DEV_STATE_UP) {
1562 dev_kfree_skb(skb);
1563 card->stats.tx_dropped++;
1564 card->stats.tx_errors++;
1565 card->stats.tx_carrier_errors++;
1566 return NETDEV_TX_OK;
1567 }
1568 if (skb->protocol == htons(ETH_P_IPV6)) {
1569 dev_kfree_skb(skb);
1570 return NETDEV_TX_OK;
1571 }
1572 netif_stop_queue(card->dev);
1573 spin_lock(&card->lock);
1574 if (card->tx_buffer != NULL &&
1575 card->tx_buffer->count + sizeof(struct lcs_header) +
1576 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1577 /* skb too big for current tx buffer. */
1578 __lcs_emit_txbuffer(card);
1579 if (card->tx_buffer == NULL) {
1580 /* Get new tx buffer */
1581 card->tx_buffer = lcs_get_buffer(&card->write);
1582 if (card->tx_buffer == NULL) {
1583 card->stats.tx_dropped++;
1584 rc = NETDEV_TX_BUSY;
1585 goto out;
1586 }
1587 card->tx_buffer->callback = lcs_txbuffer_cb;
1588 card->tx_buffer->count = 0;
1589 }
1590 header = (struct lcs_header *)
1591 (card->tx_buffer->data + card->tx_buffer->count);
1592 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1593 header->offset = card->tx_buffer->count;
1594 header->type = card->lan_type;
1595 header->slot = card->portno;
1596 skb_copy_from_linear_data(skb, header + 1, skb->len);
1597 spin_unlock(&card->lock);
1598 card->stats.tx_bytes += skb->len;
1599 card->stats.tx_packets++;
1600 dev_kfree_skb(skb);
1601 netif_wake_queue(card->dev);
1602 spin_lock(&card->lock);
1603 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1604 /* If this is the first tx buffer emit it immediately. */
1605 __lcs_emit_txbuffer(card);
1606 out:
1607 spin_unlock(&card->lock);
1608 return rc;
1609 }
1610
1611 static int
1612 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1613 {
1614 struct lcs_card *card;
1615 int rc;
1616
1617 LCS_DBF_TEXT(5, trace, "pktxmit");
1618 card = (struct lcs_card *) dev->ml_priv;
1619 rc = __lcs_start_xmit(card, skb, dev);
1620 return rc;
1621 }
1622
1623 /**
1624 * send startlan and lanstat command to make LCS device ready
1625 */
1626 static int
1627 lcs_startlan_auto(struct lcs_card *card)
1628 {
1629 int rc;
1630
1631 LCS_DBF_TEXT(2, trace, "strtauto");
1632 #ifdef CONFIG_ETHERNET
1633 card->lan_type = LCS_FRAME_TYPE_ENET;
1634 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1635 if (rc == 0)
1636 return 0;
1637
1638 #endif
1639 #ifdef CONFIG_FDDI
1640 card->lan_type = LCS_FRAME_TYPE_FDDI;
1641 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642 if (rc == 0)
1643 return 0;
1644 #endif
1645 return -EIO;
1646 }
1647
1648 static int
1649 lcs_startlan(struct lcs_card *card)
1650 {
1651 int rc, i;
1652
1653 LCS_DBF_TEXT(2, trace, "startlan");
1654 rc = 0;
1655 if (card->portno != LCS_INVALID_PORT_NO) {
1656 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1657 rc = lcs_startlan_auto(card);
1658 else
1659 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1660 } else {
1661 for (i = 0; i <= 16; i++) {
1662 card->portno = i;
1663 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1664 rc = lcs_send_startlan(card,
1665 LCS_INITIATOR_TCPIP);
1666 else
1667 /* autodetecting lan type */
1668 rc = lcs_startlan_auto(card);
1669 if (rc == 0)
1670 break;
1671 }
1672 }
1673 if (rc == 0)
1674 return lcs_send_lanstat(card);
1675 return rc;
1676 }
1677
1678 /**
1679 * LCS detect function
1680 * setup channels and make them I/O ready
1681 */
1682 static int
1683 lcs_detect(struct lcs_card *card)
1684 {
1685 int rc = 0;
1686
1687 LCS_DBF_TEXT(2, setup, "lcsdetct");
1688 /* start/reset card */
1689 if (card->dev)
1690 netif_stop_queue(card->dev);
1691 rc = lcs_stop_channels(card);
1692 if (rc == 0) {
1693 rc = lcs_start_channels(card);
1694 if (rc == 0) {
1695 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1696 if (rc == 0)
1697 rc = lcs_startlan(card);
1698 }
1699 }
1700 if (rc == 0) {
1701 card->state = DEV_STATE_UP;
1702 } else {
1703 card->state = DEV_STATE_DOWN;
1704 card->write.state = LCS_CH_STATE_INIT;
1705 card->read.state = LCS_CH_STATE_INIT;
1706 }
1707 return rc;
1708 }
1709
1710 /**
1711 * LCS Stop card
1712 */
1713 static int
1714 lcs_stopcard(struct lcs_card *card)
1715 {
1716 int rc;
1717
1718 LCS_DBF_TEXT(3, setup, "stopcard");
1719
1720 if (card->read.state != LCS_CH_STATE_STOPPED &&
1721 card->write.state != LCS_CH_STATE_STOPPED &&
1722 card->read.state != LCS_CH_STATE_ERROR &&
1723 card->write.state != LCS_CH_STATE_ERROR &&
1724 card->state == DEV_STATE_UP) {
1725 lcs_clear_multicast_list(card);
1726 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1727 rc = lcs_send_shutdown(card);
1728 }
1729 rc = lcs_stop_channels(card);
1730 card->state = DEV_STATE_DOWN;
1731
1732 return rc;
1733 }
1734
1735 /**
1736 * Kernel Thread helper functions for LGW initiated commands
1737 */
1738 static void
1739 lcs_start_kernel_thread(struct work_struct *work)
1740 {
1741 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1742 LCS_DBF_TEXT(5, trace, "krnthrd");
1743 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1744 kthread_run(lcs_recovery, card, "lcs_recover");
1745 #ifdef CONFIG_IP_MULTICAST
1746 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1747 kthread_run(lcs_register_mc_addresses, card, "regipm");
1748 #endif
1749 }
1750
1751 /**
1752 * Process control frames.
1753 */
1754 static void
1755 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1756 {
1757 LCS_DBF_TEXT(5, trace, "getctrl");
1758 if (cmd->initiator == LCS_INITIATOR_LGW) {
1759 switch(cmd->cmd_code) {
1760 case LCS_CMD_STARTUP:
1761 case LCS_CMD_STARTLAN:
1762 lcs_schedule_recovery(card);
1763 break;
1764 case LCS_CMD_STOPLAN:
1765 pr_warning("Stoplan for %s initiated by LGW.\n",
1766 card->dev->name);
1767 if (card->dev)
1768 netif_carrier_off(card->dev);
1769 break;
1770 default:
1771 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1772 break;
1773 }
1774 } else
1775 lcs_notify_lancmd_waiters(card, cmd);
1776 }
1777
1778 /**
1779 * Unpack network packet.
1780 */
1781 static void
1782 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1783 {
1784 struct sk_buff *skb;
1785
1786 LCS_DBF_TEXT(5, trace, "getskb");
1787 if (card->dev == NULL ||
1788 card->state != DEV_STATE_UP)
1789 /* The card isn't up. Ignore the packet. */
1790 return;
1791
1792 skb = dev_alloc_skb(skb_len);
1793 if (skb == NULL) {
1794 dev_err(&card->dev->dev,
1795 " Allocating a socket buffer to interface %s failed\n",
1796 card->dev->name);
1797 card->stats.rx_dropped++;
1798 return;
1799 }
1800 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1801 skb->protocol = card->lan_type_trans(skb, card->dev);
1802 card->stats.rx_bytes += skb_len;
1803 card->stats.rx_packets++;
1804 if (skb->protocol == htons(ETH_P_802_2))
1805 *((__u32 *)skb->cb) = ++card->pkt_seq;
1806 netif_rx(skb);
1807 }
1808
1809 /**
1810 * LCS main routine to get packets and lancmd replies from the buffers
1811 */
1812 static void
1813 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1814 {
1815 struct lcs_card *card;
1816 struct lcs_header *lcs_hdr;
1817 __u16 offset;
1818
1819 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1820 lcs_hdr = (struct lcs_header *) buffer->data;
1821 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1822 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1823 return;
1824 }
1825 card = container_of(channel, struct lcs_card, read);
1826 offset = 0;
1827 while (lcs_hdr->offset != 0) {
1828 if (lcs_hdr->offset <= 0 ||
1829 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1830 lcs_hdr->offset < offset) {
1831 /* Offset invalid. */
1832 card->stats.rx_length_errors++;
1833 card->stats.rx_errors++;
1834 return;
1835 }
1836 /* What kind of frame is it? */
1837 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1838 /* Control frame. */
1839 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1840 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1841 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1842 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1843 /* Normal network packet. */
1844 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1845 lcs_hdr->offset - offset -
1846 sizeof(struct lcs_header));
1847 else
1848 /* Unknown frame type. */
1849 ; // FIXME: error message ?
1850 /* Proceed to next frame. */
1851 offset = lcs_hdr->offset;
1852 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1853 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1854 }
1855 /* The buffer is now empty. Make it ready again. */
1856 lcs_ready_buffer(&card->read, buffer);
1857 }
1858
1859 /**
1860 * get network statistics for ifconfig and other user programs
1861 */
1862 static struct net_device_stats *
1863 lcs_getstats(struct net_device *dev)
1864 {
1865 struct lcs_card *card;
1866
1867 LCS_DBF_TEXT(4, trace, "netstats");
1868 card = (struct lcs_card *) dev->ml_priv;
1869 return &card->stats;
1870 }
1871
1872 /**
1873 * stop lcs device
1874 * This function will be called by user doing ifconfig xxx down
1875 */
1876 static int
1877 lcs_stop_device(struct net_device *dev)
1878 {
1879 struct lcs_card *card;
1880 int rc;
1881
1882 LCS_DBF_TEXT(2, trace, "stopdev");
1883 card = (struct lcs_card *) dev->ml_priv;
1884 netif_carrier_off(dev);
1885 netif_tx_disable(dev);
1886 dev->flags &= ~IFF_UP;
1887 wait_event(card->write.wait_q,
1888 (card->write.state != LCS_CH_STATE_RUNNING));
1889 rc = lcs_stopcard(card);
1890 if (rc)
1891 dev_err(&card->dev->dev,
1892 " Shutting down the LCS device failed\n ");
1893 return rc;
1894 }
1895
1896 /**
1897 * start lcs device and make it runnable
1898 * This function will be called by user doing ifconfig xxx up
1899 */
1900 static int
1901 lcs_open_device(struct net_device *dev)
1902 {
1903 struct lcs_card *card;
1904 int rc;
1905
1906 LCS_DBF_TEXT(2, trace, "opendev");
1907 card = (struct lcs_card *) dev->ml_priv;
1908 /* initialize statistics */
1909 rc = lcs_detect(card);
1910 if (rc) {
1911 pr_err("Error in opening device!\n");
1912
1913 } else {
1914 dev->flags |= IFF_UP;
1915 netif_carrier_on(dev);
1916 netif_wake_queue(dev);
1917 card->state = DEV_STATE_UP;
1918 }
1919 return rc;
1920 }
1921
1922 /**
1923 * show function for portno called by cat or similar things
1924 */
1925 static ssize_t
1926 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1927 {
1928 struct lcs_card *card;
1929
1930 card = dev_get_drvdata(dev);
1931
1932 if (!card)
1933 return 0;
1934
1935 return sprintf(buf, "%d\n", card->portno);
1936 }
1937
1938 /**
1939 * store the value which is piped to file portno
1940 */
1941 static ssize_t
1942 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1943 {
1944 struct lcs_card *card;
1945 int value;
1946
1947 card = dev_get_drvdata(dev);
1948
1949 if (!card)
1950 return 0;
1951
1952 sscanf(buf, "%u", &value);
1953 /* TODO: sanity checks */
1954 card->portno = value;
1955
1956 return count;
1957
1958 }
1959
1960 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1961
1962 static const char *lcs_type[] = {
1963 "not a channel",
1964 "2216 parallel",
1965 "2216 channel",
1966 "OSA LCS card",
1967 "unknown channel type",
1968 "unsupported channel type",
1969 };
1970
1971 static ssize_t
1972 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1973 {
1974 struct ccwgroup_device *cgdev;
1975
1976 cgdev = to_ccwgroupdev(dev);
1977 if (!cgdev)
1978 return -ENODEV;
1979
1980 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1981 }
1982
1983 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1984
1985 static ssize_t
1986 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1987 {
1988 struct lcs_card *card;
1989
1990 card = dev_get_drvdata(dev);
1991
1992 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1993 }
1994
1995 static ssize_t
1996 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1997 {
1998 struct lcs_card *card;
1999 int value;
2000
2001 card = dev_get_drvdata(dev);
2002
2003 if (!card)
2004 return 0;
2005
2006 sscanf(buf, "%u", &value);
2007 /* TODO: sanity checks */
2008 card->lancmd_timeout = value;
2009
2010 return count;
2011
2012 }
2013
2014 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2015
2016 static ssize_t
2017 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2018 const char *buf, size_t count)
2019 {
2020 struct lcs_card *card = dev_get_drvdata(dev);
2021 char *tmp;
2022 int i;
2023
2024 if (!card)
2025 return -EINVAL;
2026 if (card->state != DEV_STATE_UP)
2027 return -EPERM;
2028 i = simple_strtoul(buf, &tmp, 16);
2029 if (i == 1)
2030 lcs_schedule_recovery(card);
2031 return count;
2032 }
2033
2034 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2035
2036 static struct attribute * lcs_attrs[] = {
2037 &dev_attr_portno.attr,
2038 &dev_attr_type.attr,
2039 &dev_attr_lancmd_timeout.attr,
2040 &dev_attr_recover.attr,
2041 NULL,
2042 };
2043 static struct attribute_group lcs_attr_group = {
2044 .attrs = lcs_attrs,
2045 };
2046 static const struct attribute_group *lcs_attr_groups[] = {
2047 &lcs_attr_group,
2048 NULL,
2049 };
2050 static const struct device_type lcs_devtype = {
2051 .name = "lcs",
2052 .groups = lcs_attr_groups,
2053 };
2054
2055 /**
2056 * lcs_probe_device is called on establishing a new ccwgroup_device.
2057 */
2058 static int
2059 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2060 {
2061 struct lcs_card *card;
2062
2063 if (!get_device(&ccwgdev->dev))
2064 return -ENODEV;
2065
2066 LCS_DBF_TEXT(2, setup, "add_dev");
2067 card = lcs_alloc_card();
2068 if (!card) {
2069 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2070 put_device(&ccwgdev->dev);
2071 return -ENOMEM;
2072 }
2073 dev_set_drvdata(&ccwgdev->dev, card);
2074 ccwgdev->cdev[0]->handler = lcs_irq;
2075 ccwgdev->cdev[1]->handler = lcs_irq;
2076 card->gdev = ccwgdev;
2077 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2078 card->thread_start_mask = 0;
2079 card->thread_allowed_mask = 0;
2080 card->thread_running_mask = 0;
2081 ccwgdev->dev.type = &lcs_devtype;
2082
2083 return 0;
2084 }
2085
2086 static int
2087 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2088 {
2089 struct lcs_card *card;
2090
2091 LCS_DBF_TEXT(2, setup, "regnetdv");
2092 card = dev_get_drvdata(&ccwgdev->dev);
2093 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2094 return 0;
2095 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2096 return register_netdev(card->dev);
2097 }
2098
2099 /**
2100 * lcs_new_device will be called by setting the group device online.
2101 */
2102 static const struct net_device_ops lcs_netdev_ops = {
2103 .ndo_open = lcs_open_device,
2104 .ndo_stop = lcs_stop_device,
2105 .ndo_get_stats = lcs_getstats,
2106 .ndo_start_xmit = lcs_start_xmit,
2107 };
2108
2109 static const struct net_device_ops lcs_mc_netdev_ops = {
2110 .ndo_open = lcs_open_device,
2111 .ndo_stop = lcs_stop_device,
2112 .ndo_get_stats = lcs_getstats,
2113 .ndo_start_xmit = lcs_start_xmit,
2114 .ndo_set_rx_mode = lcs_set_multicast_list,
2115 };
2116
2117 static int
2118 lcs_new_device(struct ccwgroup_device *ccwgdev)
2119 {
2120 struct lcs_card *card;
2121 struct net_device *dev=NULL;
2122 enum lcs_dev_states recover_state;
2123 int rc;
2124
2125 card = dev_get_drvdata(&ccwgdev->dev);
2126 if (!card)
2127 return -ENODEV;
2128
2129 LCS_DBF_TEXT(2, setup, "newdev");
2130 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2131 card->read.ccwdev = ccwgdev->cdev[0];
2132 card->write.ccwdev = ccwgdev->cdev[1];
2133
2134 recover_state = card->state;
2135 rc = ccw_device_set_online(card->read.ccwdev);
2136 if (rc)
2137 goto out_err;
2138 rc = ccw_device_set_online(card->write.ccwdev);
2139 if (rc)
2140 goto out_werr;
2141
2142 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2143
2144 lcs_setup_card(card);
2145 rc = lcs_detect(card);
2146 if (rc) {
2147 LCS_DBF_TEXT(2, setup, "dtctfail");
2148 dev_err(&card->dev->dev,
2149 "Detecting a network adapter for LCS devices"
2150 " failed with rc=%d (0x%x)\n", rc, rc);
2151 lcs_stopcard(card);
2152 goto out;
2153 }
2154 if (card->dev) {
2155 LCS_DBF_TEXT(2, setup, "samedev");
2156 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2157 goto netdev_out;
2158 }
2159 switch (card->lan_type) {
2160 #ifdef CONFIG_ETHERNET
2161 case LCS_FRAME_TYPE_ENET:
2162 card->lan_type_trans = eth_type_trans;
2163 dev = alloc_etherdev(0);
2164 break;
2165 #endif
2166 #ifdef CONFIG_FDDI
2167 case LCS_FRAME_TYPE_FDDI:
2168 card->lan_type_trans = fddi_type_trans;
2169 dev = alloc_fddidev(0);
2170 break;
2171 #endif
2172 default:
2173 LCS_DBF_TEXT(3, setup, "errinit");
2174 pr_err(" Initialization failed\n");
2175 goto out;
2176 }
2177 if (!dev)
2178 goto out;
2179 card->dev = dev;
2180 card->dev->ml_priv = card;
2181 card->dev->netdev_ops = &lcs_netdev_ops;
2182 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2183 #ifdef CONFIG_IP_MULTICAST
2184 if (!lcs_check_multicast_support(card))
2185 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2186 #endif
2187 netdev_out:
2188 lcs_set_allowed_threads(card,0xffffffff);
2189 if (recover_state == DEV_STATE_RECOVER) {
2190 lcs_set_multicast_list(card->dev);
2191 card->dev->flags |= IFF_UP;
2192 netif_carrier_on(card->dev);
2193 netif_wake_queue(card->dev);
2194 card->state = DEV_STATE_UP;
2195 } else {
2196 lcs_stopcard(card);
2197 }
2198
2199 if (lcs_register_netdev(ccwgdev) != 0)
2200 goto out;
2201
2202 /* Print out supported assists: IPv6 */
2203 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2204 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2205 "with" : "without");
2206 /* Print out supported assist: Multicast */
2207 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2208 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2209 "with" : "without");
2210 return 0;
2211 out:
2212
2213 ccw_device_set_offline(card->write.ccwdev);
2214 out_werr:
2215 ccw_device_set_offline(card->read.ccwdev);
2216 out_err:
2217 return -ENODEV;
2218 }
2219
2220 /**
2221 * lcs_shutdown_device, called when setting the group device offline.
2222 */
2223 static int
2224 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2225 {
2226 struct lcs_card *card;
2227 enum lcs_dev_states recover_state;
2228 int ret = 0, ret2 = 0, ret3 = 0;
2229
2230 LCS_DBF_TEXT(3, setup, "shtdndev");
2231 card = dev_get_drvdata(&ccwgdev->dev);
2232 if (!card)
2233 return -ENODEV;
2234 if (recovery_mode == 0) {
2235 lcs_set_allowed_threads(card, 0);
2236 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2237 return -ERESTARTSYS;
2238 }
2239 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2240 recover_state = card->state;
2241
2242 ret = lcs_stop_device(card->dev);
2243 ret2 = ccw_device_set_offline(card->read.ccwdev);
2244 ret3 = ccw_device_set_offline(card->write.ccwdev);
2245 if (!ret)
2246 ret = (ret2) ? ret2 : ret3;
2247 if (ret)
2248 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2249 if (recover_state == DEV_STATE_UP) {
2250 card->state = DEV_STATE_RECOVER;
2251 }
2252 return 0;
2253 }
2254
2255 static int
2256 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2257 {
2258 return __lcs_shutdown_device(ccwgdev, 0);
2259 }
2260
2261 /**
2262 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2263 */
2264 static int
2265 lcs_recovery(void *ptr)
2266 {
2267 struct lcs_card *card;
2268 struct ccwgroup_device *gdev;
2269 int rc;
2270
2271 card = (struct lcs_card *) ptr;
2272
2273 LCS_DBF_TEXT(4, trace, "recover1");
2274 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2275 return 0;
2276 LCS_DBF_TEXT(4, trace, "recover2");
2277 gdev = card->gdev;
2278 dev_warn(&gdev->dev,
2279 "A recovery process has been started for the LCS device\n");
2280 rc = __lcs_shutdown_device(gdev, 1);
2281 rc = lcs_new_device(gdev);
2282 if (!rc)
2283 pr_info("Device %s successfully recovered!\n",
2284 card->dev->name);
2285 else
2286 pr_info("Device %s could not be recovered!\n",
2287 card->dev->name);
2288 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2289 return 0;
2290 }
2291
2292 /**
2293 * lcs_remove_device, free buffers and card
2294 */
2295 static void
2296 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2297 {
2298 struct lcs_card *card;
2299
2300 card = dev_get_drvdata(&ccwgdev->dev);
2301 if (!card)
2302 return;
2303
2304 LCS_DBF_TEXT(3, setup, "remdev");
2305 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2306 if (ccwgdev->state == CCWGROUP_ONLINE) {
2307 lcs_shutdown_device(ccwgdev);
2308 }
2309 if (card->dev)
2310 unregister_netdev(card->dev);
2311 lcs_cleanup_card(card);
2312 lcs_free_card(card);
2313 dev_set_drvdata(&ccwgdev->dev, NULL);
2314 put_device(&ccwgdev->dev);
2315 }
2316
2317 static int lcs_pm_suspend(struct lcs_card *card)
2318 {
2319 if (card->dev)
2320 netif_device_detach(card->dev);
2321 lcs_set_allowed_threads(card, 0);
2322 lcs_wait_for_threads(card, 0xffffffff);
2323 if (card->state != DEV_STATE_DOWN)
2324 __lcs_shutdown_device(card->gdev, 1);
2325 return 0;
2326 }
2327
2328 static int lcs_pm_resume(struct lcs_card *card)
2329 {
2330 int rc = 0;
2331
2332 if (card->state == DEV_STATE_RECOVER)
2333 rc = lcs_new_device(card->gdev);
2334 if (card->dev)
2335 netif_device_attach(card->dev);
2336 if (rc) {
2337 dev_warn(&card->gdev->dev, "The lcs device driver "
2338 "failed to recover the device\n");
2339 }
2340 return rc;
2341 }
2342
2343 static int lcs_prepare(struct ccwgroup_device *gdev)
2344 {
2345 return 0;
2346 }
2347
2348 static void lcs_complete(struct ccwgroup_device *gdev)
2349 {
2350 return;
2351 }
2352
2353 static int lcs_freeze(struct ccwgroup_device *gdev)
2354 {
2355 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2356 return lcs_pm_suspend(card);
2357 }
2358
2359 static int lcs_thaw(struct ccwgroup_device *gdev)
2360 {
2361 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2362 return lcs_pm_resume(card);
2363 }
2364
2365 static int lcs_restore(struct ccwgroup_device *gdev)
2366 {
2367 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2368 return lcs_pm_resume(card);
2369 }
2370
2371 static struct ccw_device_id lcs_ids[] = {
2372 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2373 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2374 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2375 {},
2376 };
2377 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2378
2379 static struct ccw_driver lcs_ccw_driver = {
2380 .driver = {
2381 .owner = THIS_MODULE,
2382 .name = "lcs",
2383 },
2384 .ids = lcs_ids,
2385 .probe = ccwgroup_probe_ccwdev,
2386 .remove = ccwgroup_remove_ccwdev,
2387 .int_class = IRQIO_LCS,
2388 };
2389
2390 /**
2391 * LCS ccwgroup driver registration
2392 */
2393 static struct ccwgroup_driver lcs_group_driver = {
2394 .driver = {
2395 .owner = THIS_MODULE,
2396 .name = "lcs",
2397 },
2398 .setup = lcs_probe_device,
2399 .remove = lcs_remove_device,
2400 .set_online = lcs_new_device,
2401 .set_offline = lcs_shutdown_device,
2402 .prepare = lcs_prepare,
2403 .complete = lcs_complete,
2404 .freeze = lcs_freeze,
2405 .thaw = lcs_thaw,
2406 .restore = lcs_restore,
2407 };
2408
2409 static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2410 const char *buf, size_t count)
2411 {
2412 int err;
2413 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2414 return err ? err : count;
2415 }
2416 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2417
2418 static struct attribute *lcs_drv_attrs[] = {
2419 &driver_attr_group.attr,
2420 NULL,
2421 };
2422 static struct attribute_group lcs_drv_attr_group = {
2423 .attrs = lcs_drv_attrs,
2424 };
2425 static const struct attribute_group *lcs_drv_attr_groups[] = {
2426 &lcs_drv_attr_group,
2427 NULL,
2428 };
2429
2430 /**
2431 * LCS Module/Kernel initialization function
2432 */
2433 static int
2434 __init lcs_init_module(void)
2435 {
2436 int rc;
2437
2438 pr_info("Loading %s\n", version);
2439 rc = lcs_register_debug_facility();
2440 LCS_DBF_TEXT(0, setup, "lcsinit");
2441 if (rc)
2442 goto out_err;
2443 lcs_root_dev = root_device_register("lcs");
2444 rc = PTR_RET(lcs_root_dev);
2445 if (rc)
2446 goto register_err;
2447 rc = ccw_driver_register(&lcs_ccw_driver);
2448 if (rc)
2449 goto ccw_err;
2450 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2451 rc = ccwgroup_driver_register(&lcs_group_driver);
2452 if (rc)
2453 goto ccwgroup_err;
2454 return 0;
2455
2456 ccwgroup_err:
2457 ccw_driver_unregister(&lcs_ccw_driver);
2458 ccw_err:
2459 root_device_unregister(lcs_root_dev);
2460 register_err:
2461 lcs_unregister_debug_facility();
2462 out_err:
2463 pr_err("Initializing the lcs device driver failed\n");
2464 return rc;
2465 }
2466
2467
2468 /**
2469 * LCS module cleanup function
2470 */
2471 static void
2472 __exit lcs_cleanup_module(void)
2473 {
2474 pr_info("Terminating lcs module.\n");
2475 LCS_DBF_TEXT(0, trace, "cleanup");
2476 ccwgroup_driver_unregister(&lcs_group_driver);
2477 ccw_driver_unregister(&lcs_ccw_driver);
2478 root_device_unregister(lcs_root_dev);
2479 lcs_unregister_debug_facility();
2480 }
2481
2482 module_init(lcs_init_module);
2483 module_exit(lcs_cleanup_module);
2484
2485 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2486 MODULE_LICENSE("GPL");
2487
Linux with added FPC-III support