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Linux 4.2.1
[linux/fpc-iii.git] / drivers / s390 / net / lcs.c
blob2f5b518b0e788c80761553f5b2e77762f06bfb26
1 /*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #define KMSG_COMPONENT "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/fddidevice.h>
34 #include <linux/inetdevice.h>
35 #include <linux/in.h>
36 #include <linux/igmp.h>
37 #include <linux/delay.h>
38 #include <linux/kthread.h>
39 #include <linux/slab.h>
40 #include <net/arp.h>
41 #include <net/ip.h>
42
43 #include <asm/debug.h>
44 #include <asm/idals.h>
45 #include <asm/timex.h>
46 #include <linux/device.h>
47 #include <asm/ccwgroup.h>
48
49 #include "lcs.h"
50
51
52 #if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
53 #error Cannot compile lcs.c without some net devices switched on.
54 #endif
55
56 /**
57 * initialization string for output
58 */
59
60 static char version[] __initdata = "LCS driver";
61
62 /**
63 * the root device for lcs group devices
64 */
65 static struct device *lcs_root_dev;
66
67 /**
68 * Some prototypes.
69 */
70 static void lcs_tasklet(unsigned long);
71 static void lcs_start_kernel_thread(struct work_struct *);
72 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
73 #ifdef CONFIG_IP_MULTICAST
74 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
75 #endif /* CONFIG_IP_MULTICAST */
76 static int lcs_recovery(void *ptr);
77
78 /**
79 * Debug Facility Stuff
80 */
81 static char debug_buffer[255];
82 static debug_info_t *lcs_dbf_setup;
83 static debug_info_t *lcs_dbf_trace;
84
85 /**
86 * LCS Debug Facility functions
87 */
88 static void
89 lcs_unregister_debug_facility(void)
90 {
91 debug_unregister(lcs_dbf_setup);
92 debug_unregister(lcs_dbf_trace);
93 }
94
95 static int
96 lcs_register_debug_facility(void)
97 {
98 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
99 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
100 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
101 pr_err("Not enough memory for debug facility.\n");
102 lcs_unregister_debug_facility();
103 return -ENOMEM;
104 }
105 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
106 debug_set_level(lcs_dbf_setup, 2);
107 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
108 debug_set_level(lcs_dbf_trace, 2);
109 return 0;
110 }
111
112 /**
113 * Allocate io buffers.
114 */
115 static int
116 lcs_alloc_channel(struct lcs_channel *channel)
117 {
118 int cnt;
119
120 LCS_DBF_TEXT(2, setup, "ichalloc");
121 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
122 /* alloc memory fo iobuffer */
123 channel->iob[cnt].data =
124 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
125 if (channel->iob[cnt].data == NULL)
126 break;
127 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
128 }
129 if (cnt < LCS_NUM_BUFFS) {
130 /* Not all io buffers could be allocated. */
131 LCS_DBF_TEXT(2, setup, "echalloc");
132 while (cnt-- > 0)
133 kfree(channel->iob[cnt].data);
134 return -ENOMEM;
135 }
136 return 0;
137 }
138
139 /**
140 * Free io buffers.
141 */
142 static void
143 lcs_free_channel(struct lcs_channel *channel)
144 {
145 int cnt;
146
147 LCS_DBF_TEXT(2, setup, "ichfree");
148 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
149 kfree(channel->iob[cnt].data);
150 channel->iob[cnt].data = NULL;
151 }
152 }
153
154 /*
155 * Cleanup channel.
156 */
157 static void
158 lcs_cleanup_channel(struct lcs_channel *channel)
159 {
160 LCS_DBF_TEXT(3, setup, "cleanch");
161 /* Kill write channel tasklets. */
162 tasklet_kill(&channel->irq_tasklet);
163 /* Free channel buffers. */
164 lcs_free_channel(channel);
165 }
166
167 /**
168 * LCS free memory for card and channels.
169 */
170 static void
171 lcs_free_card(struct lcs_card *card)
172 {
173 LCS_DBF_TEXT(2, setup, "remcard");
174 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
175 kfree(card);
176 }
177
178 /**
179 * LCS alloc memory for card and channels
180 */
181 static struct lcs_card *
182 lcs_alloc_card(void)
183 {
184 struct lcs_card *card;
185 int rc;
186
187 LCS_DBF_TEXT(2, setup, "alloclcs");
188
189 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
190 if (card == NULL)
191 return NULL;
192 card->lan_type = LCS_FRAME_TYPE_AUTO;
193 card->pkt_seq = 0;
194 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
195 /* Allocate io buffers for the read channel. */
196 rc = lcs_alloc_channel(&card->read);
197 if (rc){
198 LCS_DBF_TEXT(2, setup, "iccwerr");
199 lcs_free_card(card);
200 return NULL;
201 }
202 /* Allocate io buffers for the write channel. */
203 rc = lcs_alloc_channel(&card->write);
204 if (rc) {
205 LCS_DBF_TEXT(2, setup, "iccwerr");
206 lcs_cleanup_channel(&card->read);
207 lcs_free_card(card);
208 return NULL;
209 }
210
211 #ifdef CONFIG_IP_MULTICAST
212 INIT_LIST_HEAD(&card->ipm_list);
213 #endif
214 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
215 return card;
216 }
217
218 /*
219 * Setup read channel.
220 */
221 static void
222 lcs_setup_read_ccws(struct lcs_card *card)
223 {
224 int cnt;
225
226 LCS_DBF_TEXT(2, setup, "ireadccw");
227 /* Setup read ccws. */
228 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
229 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
230 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
231 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
232 card->read.ccws[cnt].flags =
233 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
234 /*
235 * Note: we have allocated the buffer with GFP_DMA, so
236 * we do not need to do set_normalized_cda.
237 */
238 card->read.ccws[cnt].cda =
239 (__u32) __pa(card->read.iob[cnt].data);
240 ((struct lcs_header *)
241 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
242 card->read.iob[cnt].callback = lcs_get_frames_cb;
243 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
244 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
245 }
246 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
247 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
248 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
249 /* Last ccw is a tic (transfer in channel). */
250 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
251 card->read.ccws[LCS_NUM_BUFFS].cda =
252 (__u32) __pa(card->read.ccws);
253 /* Setg initial state of the read channel. */
254 card->read.state = LCS_CH_STATE_INIT;
255
256 card->read.io_idx = 0;
257 card->read.buf_idx = 0;
258 }
259
260 static void
261 lcs_setup_read(struct lcs_card *card)
262 {
263 LCS_DBF_TEXT(3, setup, "initread");
264
265 lcs_setup_read_ccws(card);
266 /* Initialize read channel tasklet. */
267 card->read.irq_tasklet.data = (unsigned long) &card->read;
268 card->read.irq_tasklet.func = lcs_tasklet;
269 /* Initialize waitqueue. */
270 init_waitqueue_head(&card->read.wait_q);
271 }
272
273 /*
274 * Setup write channel.
275 */
276 static void
277 lcs_setup_write_ccws(struct lcs_card *card)
278 {
279 int cnt;
280
281 LCS_DBF_TEXT(3, setup, "iwritccw");
282 /* Setup write ccws. */
283 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
284 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
285 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
286 card->write.ccws[cnt].count = 0;
287 card->write.ccws[cnt].flags =
288 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
289 /*
290 * Note: we have allocated the buffer with GFP_DMA, so
291 * we do not need to do set_normalized_cda.
292 */
293 card->write.ccws[cnt].cda =
294 (__u32) __pa(card->write.iob[cnt].data);
295 }
296 /* Last ccw is a tic (transfer in channel). */
297 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
298 card->write.ccws[LCS_NUM_BUFFS].cda =
299 (__u32) __pa(card->write.ccws);
300 /* Set initial state of the write channel. */
301 card->read.state = LCS_CH_STATE_INIT;
302
303 card->write.io_idx = 0;
304 card->write.buf_idx = 0;
305 }
306
307 static void
308 lcs_setup_write(struct lcs_card *card)
309 {
310 LCS_DBF_TEXT(3, setup, "initwrit");
311
312 lcs_setup_write_ccws(card);
313 /* Initialize write channel tasklet. */
314 card->write.irq_tasklet.data = (unsigned long) &card->write;
315 card->write.irq_tasklet.func = lcs_tasklet;
316 /* Initialize waitqueue. */
317 init_waitqueue_head(&card->write.wait_q);
318 }
319
320 static void
321 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
322 {
323 unsigned long flags;
324
325 spin_lock_irqsave(&card->mask_lock, flags);
326 card->thread_allowed_mask = threads;
327 spin_unlock_irqrestore(&card->mask_lock, flags);
328 wake_up(&card->wait_q);
329 }
330 static inline int
331 lcs_threads_running(struct lcs_card *card, unsigned long threads)
332 {
333 unsigned long flags;
334 int rc = 0;
335
336 spin_lock_irqsave(&card->mask_lock, flags);
337 rc = (card->thread_running_mask & threads);
338 spin_unlock_irqrestore(&card->mask_lock, flags);
339 return rc;
340 }
341
342 static int
343 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
344 {
345 return wait_event_interruptible(card->wait_q,
346 lcs_threads_running(card, threads) == 0);
347 }
348
349 static inline int
350 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
351 {
352 unsigned long flags;
353
354 spin_lock_irqsave(&card->mask_lock, flags);
355 if ( !(card->thread_allowed_mask & thread) ||
356 (card->thread_start_mask & thread) ) {
357 spin_unlock_irqrestore(&card->mask_lock, flags);
358 return -EPERM;
359 }
360 card->thread_start_mask |= thread;
361 spin_unlock_irqrestore(&card->mask_lock, flags);
362 return 0;
363 }
364
365 static void
366 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
367 {
368 unsigned long flags;
369
370 spin_lock_irqsave(&card->mask_lock, flags);
371 card->thread_running_mask &= ~thread;
372 spin_unlock_irqrestore(&card->mask_lock, flags);
373 wake_up(&card->wait_q);
374 }
375
376 static inline int
377 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
378 {
379 unsigned long flags;
380 int rc = 0;
381
382 spin_lock_irqsave(&card->mask_lock, flags);
383 if (card->thread_start_mask & thread){
384 if ((card->thread_allowed_mask & thread) &&
385 !(card->thread_running_mask & thread)){
386 rc = 1;
387 card->thread_start_mask &= ~thread;
388 card->thread_running_mask |= thread;
389 } else
390 rc = -EPERM;
391 }
392 spin_unlock_irqrestore(&card->mask_lock, flags);
393 return rc;
394 }
395
396 static int
397 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
398 {
399 int rc = 0;
400 wait_event(card->wait_q,
401 (rc = __lcs_do_run_thread(card, thread)) >= 0);
402 return rc;
403 }
404
405 static int
406 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
407 {
408 unsigned long flags;
409 int rc = 0;
410
411 spin_lock_irqsave(&card->mask_lock, flags);
412 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
413 (u8) card->thread_start_mask,
414 (u8) card->thread_allowed_mask,
415 (u8) card->thread_running_mask);
416 rc = (card->thread_start_mask & thread);
417 spin_unlock_irqrestore(&card->mask_lock, flags);
418 return rc;
419 }
420
421 /**
422 * Initialize channels,card and state machines.
423 */
424 static void
425 lcs_setup_card(struct lcs_card *card)
426 {
427 LCS_DBF_TEXT(2, setup, "initcard");
428 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
429
430 lcs_setup_read(card);
431 lcs_setup_write(card);
432 /* Set cards initial state. */
433 card->state = DEV_STATE_DOWN;
434 card->tx_buffer = NULL;
435 card->tx_emitted = 0;
436
437 init_waitqueue_head(&card->wait_q);
438 spin_lock_init(&card->lock);
439 spin_lock_init(&card->ipm_lock);
440 spin_lock_init(&card->mask_lock);
441 #ifdef CONFIG_IP_MULTICAST
442 INIT_LIST_HEAD(&card->ipm_list);
443 #endif
444 INIT_LIST_HEAD(&card->lancmd_waiters);
445 }
446
447 static inline void
448 lcs_clear_multicast_list(struct lcs_card *card)
449 {
450 #ifdef CONFIG_IP_MULTICAST
451 struct lcs_ipm_list *ipm;
452 unsigned long flags;
453
454 /* Free multicast list. */
455 LCS_DBF_TEXT(3, setup, "clmclist");
456 spin_lock_irqsave(&card->ipm_lock, flags);
457 while (!list_empty(&card->ipm_list)){
458 ipm = list_entry(card->ipm_list.next,
459 struct lcs_ipm_list, list);
460 list_del(&ipm->list);
461 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
462 spin_unlock_irqrestore(&card->ipm_lock, flags);
463 lcs_send_delipm(card, ipm);
464 spin_lock_irqsave(&card->ipm_lock, flags);
465 }
466 kfree(ipm);
467 }
468 spin_unlock_irqrestore(&card->ipm_lock, flags);
469 #endif
470 }
471 /**
472 * Cleanup channels,card and state machines.
473 */
474 static void
475 lcs_cleanup_card(struct lcs_card *card)
476 {
477
478 LCS_DBF_TEXT(3, setup, "cleancrd");
479 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
480
481 if (card->dev != NULL)
482 free_netdev(card->dev);
483 /* Cleanup channels. */
484 lcs_cleanup_channel(&card->write);
485 lcs_cleanup_channel(&card->read);
486 }
487
488 /**
489 * Start channel.
490 */
491 static int
492 lcs_start_channel(struct lcs_channel *channel)
493 {
494 unsigned long flags;
495 int rc;
496
497 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
498 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
499 rc = ccw_device_start(channel->ccwdev,
500 channel->ccws + channel->io_idx, 0, 0,
501 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
502 if (rc == 0)
503 channel->state = LCS_CH_STATE_RUNNING;
504 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
505 if (rc) {
506 LCS_DBF_TEXT_(4,trace,"essh%s",
507 dev_name(&channel->ccwdev->dev));
508 dev_err(&channel->ccwdev->dev,
509 "Starting an LCS device resulted in an error,"
510 " rc=%d!\n", rc);
511 }
512 return rc;
513 }
514
515 static int
516 lcs_clear_channel(struct lcs_channel *channel)
517 {
518 unsigned long flags;
519 int rc;
520
521 LCS_DBF_TEXT(4,trace,"clearch");
522 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
523 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
524 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
525 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
526 if (rc) {
527 LCS_DBF_TEXT_(4, trace, "ecsc%s",
528 dev_name(&channel->ccwdev->dev));
529 return rc;
530 }
531 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
532 channel->state = LCS_CH_STATE_STOPPED;
533 return rc;
534 }
535
536
537 /**
538 * Stop channel.
539 */
540 static int
541 lcs_stop_channel(struct lcs_channel *channel)
542 {
543 unsigned long flags;
544 int rc;
545
546 if (channel->state == LCS_CH_STATE_STOPPED)
547 return 0;
548 LCS_DBF_TEXT(4,trace,"haltsch");
549 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
550 channel->state = LCS_CH_STATE_INIT;
551 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
552 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
553 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
554 if (rc) {
555 LCS_DBF_TEXT_(4, trace, "ehsc%s",
556 dev_name(&channel->ccwdev->dev));
557 return rc;
558 }
559 /* Asynchronous halt initialted. Wait for its completion. */
560 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
561 lcs_clear_channel(channel);
562 return 0;
563 }
564
565 /**
566 * start read and write channel
567 */
568 static int
569 lcs_start_channels(struct lcs_card *card)
570 {
571 int rc;
572
573 LCS_DBF_TEXT(2, trace, "chstart");
574 /* start read channel */
575 rc = lcs_start_channel(&card->read);
576 if (rc)
577 return rc;
578 /* start write channel */
579 rc = lcs_start_channel(&card->write);
580 if (rc)
581 lcs_stop_channel(&card->read);
582 return rc;
583 }
584
585 /**
586 * stop read and write channel
587 */
588 static int
589 lcs_stop_channels(struct lcs_card *card)
590 {
591 LCS_DBF_TEXT(2, trace, "chhalt");
592 lcs_stop_channel(&card->read);
593 lcs_stop_channel(&card->write);
594 return 0;
595 }
596
597 /**
598 * Get empty buffer.
599 */
600 static struct lcs_buffer *
601 __lcs_get_buffer(struct lcs_channel *channel)
602 {
603 int index;
604
605 LCS_DBF_TEXT(5, trace, "_getbuff");
606 index = channel->io_idx;
607 do {
608 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
609 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
610 return channel->iob + index;
611 }
612 index = (index + 1) & (LCS_NUM_BUFFS - 1);
613 } while (index != channel->io_idx);
614 return NULL;
615 }
616
617 static struct lcs_buffer *
618 lcs_get_buffer(struct lcs_channel *channel)
619 {
620 struct lcs_buffer *buffer;
621 unsigned long flags;
622
623 LCS_DBF_TEXT(5, trace, "getbuff");
624 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
625 buffer = __lcs_get_buffer(channel);
626 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
627 return buffer;
628 }
629
630 /**
631 * Resume channel program if the channel is suspended.
632 */
633 static int
634 __lcs_resume_channel(struct lcs_channel *channel)
635 {
636 int rc;
637
638 if (channel->state != LCS_CH_STATE_SUSPENDED)
639 return 0;
640 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
641 return 0;
642 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
643 rc = ccw_device_resume(channel->ccwdev);
644 if (rc) {
645 LCS_DBF_TEXT_(4, trace, "ersc%s",
646 dev_name(&channel->ccwdev->dev));
647 dev_err(&channel->ccwdev->dev,
648 "Sending data from the LCS device to the LAN failed"
649 " with rc=%d\n",rc);
650 } else
651 channel->state = LCS_CH_STATE_RUNNING;
652 return rc;
653
654 }
655
656 /**
657 * Make a buffer ready for processing.
658 */
659 static inline void
660 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
661 {
662 int prev, next;
663
664 LCS_DBF_TEXT(5, trace, "rdybits");
665 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
666 next = (index + 1) & (LCS_NUM_BUFFS - 1);
667 /* Check if we may clear the suspend bit of this buffer. */
668 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
669 /* Check if we have to set the PCI bit. */
670 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
671 /* Suspend bit of the previous buffer is not set. */
672 channel->ccws[index].flags |= CCW_FLAG_PCI;
673 /* Suspend bit of the next buffer is set. */
674 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
675 }
676 }
677
678 static int
679 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
680 {
681 unsigned long flags;
682 int index, rc;
683
684 LCS_DBF_TEXT(5, trace, "rdybuff");
685 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
686 buffer->state != LCS_BUF_STATE_PROCESSED);
687 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
688 buffer->state = LCS_BUF_STATE_READY;
689 index = buffer - channel->iob;
690 /* Set length. */
691 channel->ccws[index].count = buffer->count;
692 /* Check relevant PCI/suspend bits. */
693 __lcs_ready_buffer_bits(channel, index);
694 rc = __lcs_resume_channel(channel);
695 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
696 return rc;
697 }
698
699 /**
700 * Mark the buffer as processed. Take care of the suspend bit
701 * of the previous buffer. This function is called from
702 * interrupt context, so the lock must not be taken.
703 */
704 static int
705 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
706 {
707 int index, prev, next;
708
709 LCS_DBF_TEXT(5, trace, "prcsbuff");
710 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
711 buffer->state = LCS_BUF_STATE_PROCESSED;
712 index = buffer - channel->iob;
713 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
714 next = (index + 1) & (LCS_NUM_BUFFS - 1);
715 /* Set the suspend bit and clear the PCI bit of this buffer. */
716 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
717 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
718 /* Check the suspend bit of the previous buffer. */
719 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
720 /*
721 * Previous buffer is in state ready. It might have
722 * happened in lcs_ready_buffer that the suspend bit
723 * has not been cleared to avoid an endless loop.
724 * Do it now.
725 */
726 __lcs_ready_buffer_bits(channel, prev);
727 }
728 /* Clear PCI bit of next buffer. */
729 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
730 return __lcs_resume_channel(channel);
731 }
732
733 /**
734 * Put a processed buffer back to state empty.
735 */
736 static void
737 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
738 {
739 unsigned long flags;
740
741 LCS_DBF_TEXT(5, trace, "relbuff");
742 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
743 buffer->state != LCS_BUF_STATE_PROCESSED);
744 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
745 buffer->state = LCS_BUF_STATE_EMPTY;
746 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
747 }
748
749 /**
750 * Get buffer for a lan command.
751 */
752 static struct lcs_buffer *
753 lcs_get_lancmd(struct lcs_card *card, int count)
754 {
755 struct lcs_buffer *buffer;
756 struct lcs_cmd *cmd;
757
758 LCS_DBF_TEXT(4, trace, "getlncmd");
759 /* Get buffer and wait if none is available. */
760 wait_event(card->write.wait_q,
761 ((buffer = lcs_get_buffer(&card->write)) != NULL));
762 count += sizeof(struct lcs_header);
763 *(__u16 *)(buffer->data + count) = 0;
764 buffer->count = count + sizeof(__u16);
765 buffer->callback = lcs_release_buffer;
766 cmd = (struct lcs_cmd *) buffer->data;
767 cmd->offset = count;
768 cmd->type = LCS_FRAME_TYPE_CONTROL;
769 cmd->slot = 0;
770 return buffer;
771 }
772
773
774 static void
775 lcs_get_reply(struct lcs_reply *reply)
776 {
777 WARN_ON(atomic_read(&reply->refcnt) <= 0);
778 atomic_inc(&reply->refcnt);
779 }
780
781 static void
782 lcs_put_reply(struct lcs_reply *reply)
783 {
784 WARN_ON(atomic_read(&reply->refcnt) <= 0);
785 if (atomic_dec_and_test(&reply->refcnt)) {
786 kfree(reply);
787 }
788
789 }
790
791 static struct lcs_reply *
792 lcs_alloc_reply(struct lcs_cmd *cmd)
793 {
794 struct lcs_reply *reply;
795
796 LCS_DBF_TEXT(4, trace, "getreply");
797
798 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
799 if (!reply)
800 return NULL;
801 atomic_set(&reply->refcnt,1);
802 reply->sequence_no = cmd->sequence_no;
803 reply->received = 0;
804 reply->rc = 0;
805 init_waitqueue_head(&reply->wait_q);
806
807 return reply;
808 }
809
810 /**
811 * Notifier function for lancmd replies. Called from read irq.
812 */
813 static void
814 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
815 {
816 struct list_head *l, *n;
817 struct lcs_reply *reply;
818
819 LCS_DBF_TEXT(4, trace, "notiwait");
820 spin_lock(&card->lock);
821 list_for_each_safe(l, n, &card->lancmd_waiters) {
822 reply = list_entry(l, struct lcs_reply, list);
823 if (reply->sequence_no == cmd->sequence_no) {
824 lcs_get_reply(reply);
825 list_del_init(&reply->list);
826 if (reply->callback != NULL)
827 reply->callback(card, cmd);
828 reply->received = 1;
829 reply->rc = cmd->return_code;
830 wake_up(&reply->wait_q);
831 lcs_put_reply(reply);
832 break;
833 }
834 }
835 spin_unlock(&card->lock);
836 }
837
838 /**
839 * Emit buffer of a lan command.
840 */
841 static void
842 lcs_lancmd_timeout(unsigned long data)
843 {
844 struct lcs_reply *reply, *list_reply, *r;
845 unsigned long flags;
846
847 LCS_DBF_TEXT(4, trace, "timeout");
848 reply = (struct lcs_reply *) data;
849 spin_lock_irqsave(&reply->card->lock, flags);
850 list_for_each_entry_safe(list_reply, r,
851 &reply->card->lancmd_waiters,list) {
852 if (reply == list_reply) {
853 lcs_get_reply(reply);
854 list_del_init(&reply->list);
855 spin_unlock_irqrestore(&reply->card->lock, flags);
856 reply->received = 1;
857 reply->rc = -ETIME;
858 wake_up(&reply->wait_q);
859 lcs_put_reply(reply);
860 return;
861 }
862 }
863 spin_unlock_irqrestore(&reply->card->lock, flags);
864 }
865
866 static int
867 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
868 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
869 {
870 struct lcs_reply *reply;
871 struct lcs_cmd *cmd;
872 struct timer_list timer;
873 unsigned long flags;
874 int rc;
875
876 LCS_DBF_TEXT(4, trace, "sendcmd");
877 cmd = (struct lcs_cmd *) buffer->data;
878 cmd->return_code = 0;
879 cmd->sequence_no = card->sequence_no++;
880 reply = lcs_alloc_reply(cmd);
881 if (!reply)
882 return -ENOMEM;
883 reply->callback = reply_callback;
884 reply->card = card;
885 spin_lock_irqsave(&card->lock, flags);
886 list_add_tail(&reply->list, &card->lancmd_waiters);
887 spin_unlock_irqrestore(&card->lock, flags);
888
889 buffer->callback = lcs_release_buffer;
890 rc = lcs_ready_buffer(&card->write, buffer);
891 if (rc)
892 return rc;
893 init_timer_on_stack(&timer);
894 timer.function = lcs_lancmd_timeout;
895 timer.data = (unsigned long) reply;
896 timer.expires = jiffies + HZ*card->lancmd_timeout;
897 add_timer(&timer);
898 wait_event(reply->wait_q, reply->received);
899 del_timer_sync(&timer);
900 destroy_timer_on_stack(&timer);
901 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
902 rc = reply->rc;
903 lcs_put_reply(reply);
904 return rc ? -EIO : 0;
905 }
906
907 /**
908 * LCS startup command
909 */
910 static int
911 lcs_send_startup(struct lcs_card *card, __u8 initiator)
912 {
913 struct lcs_buffer *buffer;
914 struct lcs_cmd *cmd;
915
916 LCS_DBF_TEXT(2, trace, "startup");
917 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
918 cmd = (struct lcs_cmd *) buffer->data;
919 cmd->cmd_code = LCS_CMD_STARTUP;
920 cmd->initiator = initiator;
921 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
922 return lcs_send_lancmd(card, buffer, NULL);
923 }
924
925 /**
926 * LCS shutdown command
927 */
928 static int
929 lcs_send_shutdown(struct lcs_card *card)
930 {
931 struct lcs_buffer *buffer;
932 struct lcs_cmd *cmd;
933
934 LCS_DBF_TEXT(2, trace, "shutdown");
935 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
936 cmd = (struct lcs_cmd *) buffer->data;
937 cmd->cmd_code = LCS_CMD_SHUTDOWN;
938 cmd->initiator = LCS_INITIATOR_TCPIP;
939 return lcs_send_lancmd(card, buffer, NULL);
940 }
941
942 /**
943 * LCS lanstat command
944 */
945 static void
946 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
947 {
948 LCS_DBF_TEXT(2, trace, "statcb");
949 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
950 }
951
952 static int
953 lcs_send_lanstat(struct lcs_card *card)
954 {
955 struct lcs_buffer *buffer;
956 struct lcs_cmd *cmd;
957
958 LCS_DBF_TEXT(2,trace, "cmdstat");
959 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
960 cmd = (struct lcs_cmd *) buffer->data;
961 /* Setup lanstat command. */
962 cmd->cmd_code = LCS_CMD_LANSTAT;
963 cmd->initiator = LCS_INITIATOR_TCPIP;
964 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
965 cmd->cmd.lcs_std_cmd.portno = card->portno;
966 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
967 }
968
969 /**
970 * send stoplan command
971 */
972 static int
973 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
974 {
975 struct lcs_buffer *buffer;
976 struct lcs_cmd *cmd;
977
978 LCS_DBF_TEXT(2, trace, "cmdstpln");
979 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
980 cmd = (struct lcs_cmd *) buffer->data;
981 cmd->cmd_code = LCS_CMD_STOPLAN;
982 cmd->initiator = initiator;
983 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
984 cmd->cmd.lcs_std_cmd.portno = card->portno;
985 return lcs_send_lancmd(card, buffer, NULL);
986 }
987
988 /**
989 * send startlan command
990 */
991 static void
992 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
993 {
994 LCS_DBF_TEXT(2, trace, "srtlancb");
995 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
996 card->portno = cmd->cmd.lcs_std_cmd.portno;
997 }
998
999 static int
1000 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1001 {
1002 struct lcs_buffer *buffer;
1003 struct lcs_cmd *cmd;
1004
1005 LCS_DBF_TEXT(2, trace, "cmdstaln");
1006 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1007 cmd = (struct lcs_cmd *) buffer->data;
1008 cmd->cmd_code = LCS_CMD_STARTLAN;
1009 cmd->initiator = initiator;
1010 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1011 cmd->cmd.lcs_std_cmd.portno = card->portno;
1012 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1013 }
1014
1015 #ifdef CONFIG_IP_MULTICAST
1016 /**
1017 * send setipm command (Multicast)
1018 */
1019 static int
1020 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1021 {
1022 struct lcs_buffer *buffer;
1023 struct lcs_cmd *cmd;
1024
1025 LCS_DBF_TEXT(2, trace, "cmdsetim");
1026 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1027 cmd = (struct lcs_cmd *) buffer->data;
1028 cmd->cmd_code = LCS_CMD_SETIPM;
1029 cmd->initiator = LCS_INITIATOR_TCPIP;
1030 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1031 cmd->cmd.lcs_qipassist.portno = card->portno;
1032 cmd->cmd.lcs_qipassist.version = 4;
1033 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1034 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1035 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1036 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1037 return lcs_send_lancmd(card, buffer, NULL);
1038 }
1039
1040 /**
1041 * send delipm command (Multicast)
1042 */
1043 static int
1044 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1045 {
1046 struct lcs_buffer *buffer;
1047 struct lcs_cmd *cmd;
1048
1049 LCS_DBF_TEXT(2, trace, "cmddelim");
1050 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1051 cmd = (struct lcs_cmd *) buffer->data;
1052 cmd->cmd_code = LCS_CMD_DELIPM;
1053 cmd->initiator = LCS_INITIATOR_TCPIP;
1054 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1055 cmd->cmd.lcs_qipassist.portno = card->portno;
1056 cmd->cmd.lcs_qipassist.version = 4;
1057 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1058 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1059 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1060 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1061 return lcs_send_lancmd(card, buffer, NULL);
1062 }
1063
1064 /**
1065 * check if multicast is supported by LCS
1066 */
1067 static void
1068 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1069 {
1070 LCS_DBF_TEXT(2, trace, "chkmccb");
1071 card->ip_assists_supported =
1072 cmd->cmd.lcs_qipassist.ip_assists_supported;
1073 card->ip_assists_enabled =
1074 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1075 }
1076
1077 static int
1078 lcs_check_multicast_support(struct lcs_card *card)
1079 {
1080 struct lcs_buffer *buffer;
1081 struct lcs_cmd *cmd;
1082 int rc;
1083
1084 LCS_DBF_TEXT(2, trace, "cmdqipa");
1085 /* Send query ipassist. */
1086 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1087 cmd = (struct lcs_cmd *) buffer->data;
1088 cmd->cmd_code = LCS_CMD_QIPASSIST;
1089 cmd->initiator = LCS_INITIATOR_TCPIP;
1090 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1091 cmd->cmd.lcs_qipassist.portno = card->portno;
1092 cmd->cmd.lcs_qipassist.version = 4;
1093 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1094 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1095 if (rc != 0) {
1096 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1097 return -EOPNOTSUPP;
1098 }
1099 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1100 return 0;
1101 return -EOPNOTSUPP;
1102 }
1103
1104 /**
1105 * set or del multicast address on LCS card
1106 */
1107 static void
1108 lcs_fix_multicast_list(struct lcs_card *card)
1109 {
1110 struct list_head failed_list;
1111 struct lcs_ipm_list *ipm, *tmp;
1112 unsigned long flags;
1113 int rc;
1114
1115 LCS_DBF_TEXT(4,trace, "fixipm");
1116 INIT_LIST_HEAD(&failed_list);
1117 spin_lock_irqsave(&card->ipm_lock, flags);
1118 list_modified:
1119 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1120 switch (ipm->ipm_state) {
1121 case LCS_IPM_STATE_SET_REQUIRED:
1122 /* del from ipm_list so no one else can tamper with
1123 * this entry */
1124 list_del_init(&ipm->list);
1125 spin_unlock_irqrestore(&card->ipm_lock, flags);
1126 rc = lcs_send_setipm(card, ipm);
1127 spin_lock_irqsave(&card->ipm_lock, flags);
1128 if (rc) {
1129 pr_info("Adding multicast address failed."
1130 " Table possibly full!\n");
1131 /* store ipm in failed list -> will be added
1132 * to ipm_list again, so a retry will be done
1133 * during the next call of this function */
1134 list_add_tail(&ipm->list, &failed_list);
1135 } else {
1136 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1137 /* re-insert into ipm_list */
1138 list_add_tail(&ipm->list, &card->ipm_list);
1139 }
1140 goto list_modified;
1141 case LCS_IPM_STATE_DEL_REQUIRED:
1142 list_del(&ipm->list);
1143 spin_unlock_irqrestore(&card->ipm_lock, flags);
1144 lcs_send_delipm(card, ipm);
1145 spin_lock_irqsave(&card->ipm_lock, flags);
1146 kfree(ipm);
1147 goto list_modified;
1148 case LCS_IPM_STATE_ON_CARD:
1149 break;
1150 }
1151 }
1152 /* re-insert all entries from the failed_list into ipm_list */
1153 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1154 list_move_tail(&ipm->list, &card->ipm_list);
1155
1156 spin_unlock_irqrestore(&card->ipm_lock, flags);
1157 }
1158
1159 /**
1160 * get mac address for the relevant Multicast address
1161 */
1162 static void
1163 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1164 {
1165 LCS_DBF_TEXT(4,trace, "getmac");
1166 ip_eth_mc_map(ipm, mac);
1167 }
1168
1169 /**
1170 * function called by net device to handle multicast address relevant things
1171 */
1172 static inline void
1173 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1174 {
1175 struct ip_mc_list *im4;
1176 struct list_head *l;
1177 struct lcs_ipm_list *ipm;
1178 unsigned long flags;
1179 char buf[MAX_ADDR_LEN];
1180
1181 LCS_DBF_TEXT(4, trace, "remmclst");
1182 spin_lock_irqsave(&card->ipm_lock, flags);
1183 list_for_each(l, &card->ipm_list) {
1184 ipm = list_entry(l, struct lcs_ipm_list, list);
1185 for (im4 = rcu_dereference(in4_dev->mc_list);
1186 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1187 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1188 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1189 (memcmp(buf, &ipm->ipm.mac_addr,
1190 LCS_MAC_LENGTH) == 0) )
1191 break;
1192 }
1193 if (im4 == NULL)
1194 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1195 }
1196 spin_unlock_irqrestore(&card->ipm_lock, flags);
1197 }
1198
1199 static inline struct lcs_ipm_list *
1200 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1201 {
1202 struct lcs_ipm_list *tmp, *ipm = NULL;
1203 struct list_head *l;
1204 unsigned long flags;
1205
1206 LCS_DBF_TEXT(4, trace, "chkmcent");
1207 spin_lock_irqsave(&card->ipm_lock, flags);
1208 list_for_each(l, &card->ipm_list) {
1209 tmp = list_entry(l, struct lcs_ipm_list, list);
1210 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1211 (memcmp(buf, &tmp->ipm.mac_addr,
1212 LCS_MAC_LENGTH) == 0) ) {
1213 ipm = tmp;
1214 break;
1215 }
1216 }
1217 spin_unlock_irqrestore(&card->ipm_lock, flags);
1218 return ipm;
1219 }
1220
1221 static inline void
1222 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1223 {
1224
1225 struct ip_mc_list *im4;
1226 struct lcs_ipm_list *ipm;
1227 char buf[MAX_ADDR_LEN];
1228 unsigned long flags;
1229
1230 LCS_DBF_TEXT(4, trace, "setmclst");
1231 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1232 im4 = rcu_dereference(im4->next_rcu)) {
1233 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1234 ipm = lcs_check_addr_entry(card, im4, buf);
1235 if (ipm != NULL)
1236 continue; /* Address already in list. */
1237 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1238 if (ipm == NULL) {
1239 pr_info("Not enough memory to add"
1240 " new multicast entry!\n");
1241 break;
1242 }
1243 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1244 ipm->ipm.ip_addr = im4->multiaddr;
1245 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1246 spin_lock_irqsave(&card->ipm_lock, flags);
1247 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1248 list_add(&ipm->list, &card->ipm_list);
1249 spin_unlock_irqrestore(&card->ipm_lock, flags);
1250 }
1251 }
1252
1253 static int
1254 lcs_register_mc_addresses(void *data)
1255 {
1256 struct lcs_card *card;
1257 struct in_device *in4_dev;
1258
1259 card = (struct lcs_card *) data;
1260
1261 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1262 return 0;
1263 LCS_DBF_TEXT(4, trace, "regmulti");
1264
1265 in4_dev = in_dev_get(card->dev);
1266 if (in4_dev == NULL)
1267 goto out;
1268 rcu_read_lock();
1269 lcs_remove_mc_addresses(card,in4_dev);
1270 lcs_set_mc_addresses(card, in4_dev);
1271 rcu_read_unlock();
1272 in_dev_put(in4_dev);
1273
1274 netif_carrier_off(card->dev);
1275 netif_tx_disable(card->dev);
1276 wait_event(card->write.wait_q,
1277 (card->write.state != LCS_CH_STATE_RUNNING));
1278 lcs_fix_multicast_list(card);
1279 if (card->state == DEV_STATE_UP) {
1280 netif_carrier_on(card->dev);
1281 netif_wake_queue(card->dev);
1282 }
1283 out:
1284 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1285 return 0;
1286 }
1287 #endif /* CONFIG_IP_MULTICAST */
1288
1289 /**
1290 * function called by net device to
1291 * handle multicast address relevant things
1292 */
1293 static void
1294 lcs_set_multicast_list(struct net_device *dev)
1295 {
1296 #ifdef CONFIG_IP_MULTICAST
1297 struct lcs_card *card;
1298
1299 LCS_DBF_TEXT(4, trace, "setmulti");
1300 card = (struct lcs_card *) dev->ml_priv;
1301
1302 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1303 schedule_work(&card->kernel_thread_starter);
1304 #endif /* CONFIG_IP_MULTICAST */
1305 }
1306
1307 static long
1308 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1309 {
1310 if (!IS_ERR(irb))
1311 return 0;
1312
1313 switch (PTR_ERR(irb)) {
1314 case -EIO:
1315 dev_warn(&cdev->dev,
1316 "An I/O-error occurred on the LCS device\n");
1317 LCS_DBF_TEXT(2, trace, "ckirberr");
1318 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1319 break;
1320 case -ETIMEDOUT:
1321 dev_warn(&cdev->dev,
1322 "A command timed out on the LCS device\n");
1323 LCS_DBF_TEXT(2, trace, "ckirberr");
1324 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1325 break;
1326 default:
1327 dev_warn(&cdev->dev,
1328 "An error occurred on the LCS device, rc=%ld\n",
1329 PTR_ERR(irb));
1330 LCS_DBF_TEXT(2, trace, "ckirberr");
1331 LCS_DBF_TEXT(2, trace, " rc???");
1332 }
1333 return PTR_ERR(irb);
1334 }
1335
1336 static int
1337 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1338 {
1339 int dstat, cstat;
1340 char *sense;
1341
1342 sense = (char *) irb->ecw;
1343 cstat = irb->scsw.cmd.cstat;
1344 dstat = irb->scsw.cmd.dstat;
1345
1346 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1347 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1348 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1349 LCS_DBF_TEXT(2, trace, "CGENCHK");
1350 return 1;
1351 }
1352 if (dstat & DEV_STAT_UNIT_CHECK) {
1353 if (sense[LCS_SENSE_BYTE_1] &
1354 LCS_SENSE_RESETTING_EVENT) {
1355 LCS_DBF_TEXT(2, trace, "REVIND");
1356 return 1;
1357 }
1358 if (sense[LCS_SENSE_BYTE_0] &
1359 LCS_SENSE_CMD_REJECT) {
1360 LCS_DBF_TEXT(2, trace, "CMDREJ");
1361 return 0;
1362 }
1363 if ((!sense[LCS_SENSE_BYTE_0]) &&
1364 (!sense[LCS_SENSE_BYTE_1]) &&
1365 (!sense[LCS_SENSE_BYTE_2]) &&
1366 (!sense[LCS_SENSE_BYTE_3])) {
1367 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1368 return 0;
1369 }
1370 LCS_DBF_TEXT(2, trace, "DGENCHK");
1371 return 1;
1372 }
1373 return 0;
1374 }
1375
1376 static void
1377 lcs_schedule_recovery(struct lcs_card *card)
1378 {
1379 LCS_DBF_TEXT(2, trace, "startrec");
1380 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1381 schedule_work(&card->kernel_thread_starter);
1382 }
1383
1384 /**
1385 * IRQ Handler for LCS channels
1386 */
1387 static void
1388 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1389 {
1390 struct lcs_card *card;
1391 struct lcs_channel *channel;
1392 int rc, index;
1393 int cstat, dstat;
1394
1395 if (lcs_check_irb_error(cdev, irb))
1396 return;
1397
1398 card = CARD_FROM_DEV(cdev);
1399 if (card->read.ccwdev == cdev)
1400 channel = &card->read;
1401 else
1402 channel = &card->write;
1403
1404 cstat = irb->scsw.cmd.cstat;
1405 dstat = irb->scsw.cmd.dstat;
1406 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1407 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1408 irb->scsw.cmd.dstat);
1409 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1410 irb->scsw.cmd.actl);
1411
1412 /* Check for channel and device errors presented */
1413 rc = lcs_get_problem(cdev, irb);
1414 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1415 dev_warn(&cdev->dev,
1416 "The LCS device stopped because of an error,"
1417 " dstat=0x%X, cstat=0x%X \n",
1418 dstat, cstat);
1419 if (rc) {
1420 channel->state = LCS_CH_STATE_ERROR;
1421 }
1422 }
1423 if (channel->state == LCS_CH_STATE_ERROR) {
1424 lcs_schedule_recovery(card);
1425 wake_up(&card->wait_q);
1426 return;
1427 }
1428 /* How far in the ccw chain have we processed? */
1429 if ((channel->state != LCS_CH_STATE_INIT) &&
1430 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1431 (irb->scsw.cmd.cpa != 0)) {
1432 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1433 - channel->ccws;
1434 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1435 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1436 /* Bloody io subsystem tells us lies about cpa... */
1437 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1438 while (channel->io_idx != index) {
1439 __lcs_processed_buffer(channel,
1440 channel->iob + channel->io_idx);
1441 channel->io_idx =
1442 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1443 }
1444 }
1445
1446 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1447 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1448 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1449 /* Mark channel as stopped. */
1450 channel->state = LCS_CH_STATE_STOPPED;
1451 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1452 /* CCW execution stopped on a suspend bit. */
1453 channel->state = LCS_CH_STATE_SUSPENDED;
1454 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1455 if (irb->scsw.cmd.cc != 0) {
1456 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1457 return;
1458 }
1459 /* The channel has been stopped by halt_IO. */
1460 channel->state = LCS_CH_STATE_HALTED;
1461 }
1462 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1463 channel->state = LCS_CH_STATE_CLEARED;
1464 /* Do the rest in the tasklet. */
1465 tasklet_schedule(&channel->irq_tasklet);
1466 }
1467
1468 /**
1469 * Tasklet for IRQ handler
1470 */
1471 static void
1472 lcs_tasklet(unsigned long data)
1473 {
1474 unsigned long flags;
1475 struct lcs_channel *channel;
1476 struct lcs_buffer *iob;
1477 int buf_idx;
1478
1479 channel = (struct lcs_channel *) data;
1480 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1481
1482 /* Check for processed buffers. */
1483 iob = channel->iob;
1484 buf_idx = channel->buf_idx;
1485 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1486 /* Do the callback thing. */
1487 if (iob[buf_idx].callback != NULL)
1488 iob[buf_idx].callback(channel, iob + buf_idx);
1489 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1490 }
1491 channel->buf_idx = buf_idx;
1492
1493 if (channel->state == LCS_CH_STATE_STOPPED)
1494 lcs_start_channel(channel);
1495 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1496 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1497 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1498 __lcs_resume_channel(channel);
1499 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1500
1501 /* Something happened on the channel. Wake up waiters. */
1502 wake_up(&channel->wait_q);
1503 }
1504
1505 /**
1506 * Finish current tx buffer and make it ready for transmit.
1507 */
1508 static void
1509 __lcs_emit_txbuffer(struct lcs_card *card)
1510 {
1511 LCS_DBF_TEXT(5, trace, "emittx");
1512 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1513 card->tx_buffer->count += 2;
1514 lcs_ready_buffer(&card->write, card->tx_buffer);
1515 card->tx_buffer = NULL;
1516 card->tx_emitted++;
1517 }
1518
1519 /**
1520 * Callback for finished tx buffers.
1521 */
1522 static void
1523 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1524 {
1525 struct lcs_card *card;
1526
1527 LCS_DBF_TEXT(5, trace, "txbuffcb");
1528 /* Put buffer back to pool. */
1529 lcs_release_buffer(channel, buffer);
1530 card = container_of(channel, struct lcs_card, write);
1531 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1532 netif_wake_queue(card->dev);
1533 spin_lock(&card->lock);
1534 card->tx_emitted--;
1535 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1536 /*
1537 * Last running tx buffer has finished. Submit partially
1538 * filled current buffer.
1539 */
1540 __lcs_emit_txbuffer(card);
1541 spin_unlock(&card->lock);
1542 }
1543
1544 /**
1545 * Packet transmit function called by network stack
1546 */
1547 static int
1548 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1549 struct net_device *dev)
1550 {
1551 struct lcs_header *header;
1552 int rc = NETDEV_TX_OK;
1553
1554 LCS_DBF_TEXT(5, trace, "hardxmit");
1555 if (skb == NULL) {
1556 card->stats.tx_dropped++;
1557 card->stats.tx_errors++;
1558 return NETDEV_TX_OK;
1559 }
1560 if (card->state != DEV_STATE_UP) {
1561 dev_kfree_skb(skb);
1562 card->stats.tx_dropped++;
1563 card->stats.tx_errors++;
1564 card->stats.tx_carrier_errors++;
1565 return NETDEV_TX_OK;
1566 }
1567 if (skb->protocol == htons(ETH_P_IPV6)) {
1568 dev_kfree_skb(skb);
1569 return NETDEV_TX_OK;
1570 }
1571 netif_stop_queue(card->dev);
1572 spin_lock(&card->lock);
1573 if (card->tx_buffer != NULL &&
1574 card->tx_buffer->count + sizeof(struct lcs_header) +
1575 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1576 /* skb too big for current tx buffer. */
1577 __lcs_emit_txbuffer(card);
1578 if (card->tx_buffer == NULL) {
1579 /* Get new tx buffer */
1580 card->tx_buffer = lcs_get_buffer(&card->write);
1581 if (card->tx_buffer == NULL) {
1582 card->stats.tx_dropped++;
1583 rc = NETDEV_TX_BUSY;
1584 goto out;
1585 }
1586 card->tx_buffer->callback = lcs_txbuffer_cb;
1587 card->tx_buffer->count = 0;
1588 }
1589 header = (struct lcs_header *)
1590 (card->tx_buffer->data + card->tx_buffer->count);
1591 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1592 header->offset = card->tx_buffer->count;
1593 header->type = card->lan_type;
1594 header->slot = card->portno;
1595 skb_copy_from_linear_data(skb, header + 1, skb->len);
1596 spin_unlock(&card->lock);
1597 card->stats.tx_bytes += skb->len;
1598 card->stats.tx_packets++;
1599 dev_kfree_skb(skb);
1600 netif_wake_queue(card->dev);
1601 spin_lock(&card->lock);
1602 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1603 /* If this is the first tx buffer emit it immediately. */
1604 __lcs_emit_txbuffer(card);
1605 out:
1606 spin_unlock(&card->lock);
1607 return rc;
1608 }
1609
1610 static int
1611 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1612 {
1613 struct lcs_card *card;
1614 int rc;
1615
1616 LCS_DBF_TEXT(5, trace, "pktxmit");
1617 card = (struct lcs_card *) dev->ml_priv;
1618 rc = __lcs_start_xmit(card, skb, dev);
1619 return rc;
1620 }
1621
1622 /**
1623 * send startlan and lanstat command to make LCS device ready
1624 */
1625 static int
1626 lcs_startlan_auto(struct lcs_card *card)
1627 {
1628 int rc;
1629
1630 LCS_DBF_TEXT(2, trace, "strtauto");
1631 #ifdef CONFIG_ETHERNET
1632 card->lan_type = LCS_FRAME_TYPE_ENET;
1633 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1634 if (rc == 0)
1635 return 0;
1636
1637 #endif
1638 #ifdef CONFIG_FDDI
1639 card->lan_type = LCS_FRAME_TYPE_FDDI;
1640 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1641 if (rc == 0)
1642 return 0;
1643 #endif
1644 return -EIO;
1645 }
1646
1647 static int
1648 lcs_startlan(struct lcs_card *card)
1649 {
1650 int rc, i;
1651
1652 LCS_DBF_TEXT(2, trace, "startlan");
1653 rc = 0;
1654 if (card->portno != LCS_INVALID_PORT_NO) {
1655 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1656 rc = lcs_startlan_auto(card);
1657 else
1658 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1659 } else {
1660 for (i = 0; i <= 16; i++) {
1661 card->portno = i;
1662 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1663 rc = lcs_send_startlan(card,
1664 LCS_INITIATOR_TCPIP);
1665 else
1666 /* autodetecting lan type */
1667 rc = lcs_startlan_auto(card);
1668 if (rc == 0)
1669 break;
1670 }
1671 }
1672 if (rc == 0)
1673 return lcs_send_lanstat(card);
1674 return rc;
1675 }
1676
1677 /**
1678 * LCS detect function
1679 * setup channels and make them I/O ready
1680 */
1681 static int
1682 lcs_detect(struct lcs_card *card)
1683 {
1684 int rc = 0;
1685
1686 LCS_DBF_TEXT(2, setup, "lcsdetct");
1687 /* start/reset card */
1688 if (card->dev)
1689 netif_stop_queue(card->dev);
1690 rc = lcs_stop_channels(card);
1691 if (rc == 0) {
1692 rc = lcs_start_channels(card);
1693 if (rc == 0) {
1694 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1695 if (rc == 0)
1696 rc = lcs_startlan(card);
1697 }
1698 }
1699 if (rc == 0) {
1700 card->state = DEV_STATE_UP;
1701 } else {
1702 card->state = DEV_STATE_DOWN;
1703 card->write.state = LCS_CH_STATE_INIT;
1704 card->read.state = LCS_CH_STATE_INIT;
1705 }
1706 return rc;
1707 }
1708
1709 /**
1710 * LCS Stop card
1711 */
1712 static int
1713 lcs_stopcard(struct lcs_card *card)
1714 {
1715 int rc;
1716
1717 LCS_DBF_TEXT(3, setup, "stopcard");
1718
1719 if (card->read.state != LCS_CH_STATE_STOPPED &&
1720 card->write.state != LCS_CH_STATE_STOPPED &&
1721 card->read.state != LCS_CH_STATE_ERROR &&
1722 card->write.state != LCS_CH_STATE_ERROR &&
1723 card->state == DEV_STATE_UP) {
1724 lcs_clear_multicast_list(card);
1725 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1726 rc = lcs_send_shutdown(card);
1727 }
1728 rc = lcs_stop_channels(card);
1729 card->state = DEV_STATE_DOWN;
1730
1731 return rc;
1732 }
1733
1734 /**
1735 * Kernel Thread helper functions for LGW initiated commands
1736 */
1737 static void
1738 lcs_start_kernel_thread(struct work_struct *work)
1739 {
1740 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1741 LCS_DBF_TEXT(5, trace, "krnthrd");
1742 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1743 kthread_run(lcs_recovery, card, "lcs_recover");
1744 #ifdef CONFIG_IP_MULTICAST
1745 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1746 kthread_run(lcs_register_mc_addresses, card, "regipm");
1747 #endif
1748 }
1749
1750 /**
1751 * Process control frames.
1752 */
1753 static void
1754 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1755 {
1756 LCS_DBF_TEXT(5, trace, "getctrl");
1757 if (cmd->initiator == LCS_INITIATOR_LGW) {
1758 switch(cmd->cmd_code) {
1759 case LCS_CMD_STARTUP:
1760 case LCS_CMD_STARTLAN:
1761 lcs_schedule_recovery(card);
1762 break;
1763 case LCS_CMD_STOPLAN:
1764 pr_warning("Stoplan for %s initiated by LGW.\n",
1765 card->dev->name);
1766 if (card->dev)
1767 netif_carrier_off(card->dev);
1768 break;
1769 default:
1770 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1771 break;
1772 }
1773 } else
1774 lcs_notify_lancmd_waiters(card, cmd);
1775 }
1776
1777 /**
1778 * Unpack network packet.
1779 */
1780 static void
1781 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1782 {
1783 struct sk_buff *skb;
1784
1785 LCS_DBF_TEXT(5, trace, "getskb");
1786 if (card->dev == NULL ||
1787 card->state != DEV_STATE_UP)
1788 /* The card isn't up. Ignore the packet. */
1789 return;
1790
1791 skb = dev_alloc_skb(skb_len);
1792 if (skb == NULL) {
1793 dev_err(&card->dev->dev,
1794 " Allocating a socket buffer to interface %s failed\n",
1795 card->dev->name);
1796 card->stats.rx_dropped++;
1797 return;
1798 }
1799 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1800 skb->protocol = card->lan_type_trans(skb, card->dev);
1801 card->stats.rx_bytes += skb_len;
1802 card->stats.rx_packets++;
1803 if (skb->protocol == htons(ETH_P_802_2))
1804 *((__u32 *)skb->cb) = ++card->pkt_seq;
1805 netif_rx(skb);
1806 }
1807
1808 /**
1809 * LCS main routine to get packets and lancmd replies from the buffers
1810 */
1811 static void
1812 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1813 {
1814 struct lcs_card *card;
1815 struct lcs_header *lcs_hdr;
1816 __u16 offset;
1817
1818 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1819 lcs_hdr = (struct lcs_header *) buffer->data;
1820 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1821 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1822 return;
1823 }
1824 card = container_of(channel, struct lcs_card, read);
1825 offset = 0;
1826 while (lcs_hdr->offset != 0) {
1827 if (lcs_hdr->offset <= 0 ||
1828 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1829 lcs_hdr->offset < offset) {
1830 /* Offset invalid. */
1831 card->stats.rx_length_errors++;
1832 card->stats.rx_errors++;
1833 return;
1834 }
1835 /* What kind of frame is it? */
1836 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1837 /* Control frame. */
1838 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1839 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1840 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1841 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1842 /* Normal network packet. */
1843 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1844 lcs_hdr->offset - offset -
1845 sizeof(struct lcs_header));
1846 else
1847 /* Unknown frame type. */
1848 ; // FIXME: error message ?
1849 /* Proceed to next frame. */
1850 offset = lcs_hdr->offset;
1851 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1852 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1853 }
1854 /* The buffer is now empty. Make it ready again. */
1855 lcs_ready_buffer(&card->read, buffer);
1856 }
1857
1858 /**
1859 * get network statistics for ifconfig and other user programs
1860 */
1861 static struct net_device_stats *
1862 lcs_getstats(struct net_device *dev)
1863 {
1864 struct lcs_card *card;
1865
1866 LCS_DBF_TEXT(4, trace, "netstats");
1867 card = (struct lcs_card *) dev->ml_priv;
1868 return &card->stats;
1869 }
1870
1871 /**
1872 * stop lcs device
1873 * This function will be called by user doing ifconfig xxx down
1874 */
1875 static int
1876 lcs_stop_device(struct net_device *dev)
1877 {
1878 struct lcs_card *card;
1879 int rc;
1880
1881 LCS_DBF_TEXT(2, trace, "stopdev");
1882 card = (struct lcs_card *) dev->ml_priv;
1883 netif_carrier_off(dev);
1884 netif_tx_disable(dev);
1885 dev->flags &= ~IFF_UP;
1886 wait_event(card->write.wait_q,
1887 (card->write.state != LCS_CH_STATE_RUNNING));
1888 rc = lcs_stopcard(card);
1889 if (rc)
1890 dev_err(&card->dev->dev,
1891 " Shutting down the LCS device failed\n ");
1892 return rc;
1893 }
1894
1895 /**
1896 * start lcs device and make it runnable
1897 * This function will be called by user doing ifconfig xxx up
1898 */
1899 static int
1900 lcs_open_device(struct net_device *dev)
1901 {
1902 struct lcs_card *card;
1903 int rc;
1904
1905 LCS_DBF_TEXT(2, trace, "opendev");
1906 card = (struct lcs_card *) dev->ml_priv;
1907 /* initialize statistics */
1908 rc = lcs_detect(card);
1909 if (rc) {
1910 pr_err("Error in opening device!\n");
1911
1912 } else {
1913 dev->flags |= IFF_UP;
1914 netif_carrier_on(dev);
1915 netif_wake_queue(dev);
1916 card->state = DEV_STATE_UP;
1917 }
1918 return rc;
1919 }
1920
1921 /**
1922 * show function for portno called by cat or similar things
1923 */
1924 static ssize_t
1925 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1926 {
1927 struct lcs_card *card;
1928
1929 card = dev_get_drvdata(dev);
1930
1931 if (!card)
1932 return 0;
1933
1934 return sprintf(buf, "%d\n", card->portno);
1935 }
1936
1937 /**
1938 * store the value which is piped to file portno
1939 */
1940 static ssize_t
1941 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1942 {
1943 struct lcs_card *card;
1944 int rc;
1945 s16 value;
1946
1947 card = dev_get_drvdata(dev);
1948
1949 if (!card)
1950 return 0;
1951
1952 rc = kstrtos16(buf, 0, &value);
1953 if (rc)
1954 return -EINVAL;
1955 /* TODO: sanity checks */
1956 card->portno = value;
1957
1958 return count;
1959
1960 }
1961
1962 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1963
1964 static const char *lcs_type[] = {
1965 "not a channel",
1966 "2216 parallel",
1967 "2216 channel",
1968 "OSA LCS card",
1969 "unknown channel type",
1970 "unsupported channel type",
1971 };
1972
1973 static ssize_t
1974 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1975 {
1976 struct ccwgroup_device *cgdev;
1977
1978 cgdev = to_ccwgroupdev(dev);
1979 if (!cgdev)
1980 return -ENODEV;
1981
1982 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1983 }
1984
1985 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1986
1987 static ssize_t
1988 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1989 {
1990 struct lcs_card *card;
1991
1992 card = dev_get_drvdata(dev);
1993
1994 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1995 }
1996
1997 static ssize_t
1998 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1999 {
2000 struct lcs_card *card;
2001 unsigned int value;
2002 int rc;
2003
2004 card = dev_get_drvdata(dev);
2005
2006 if (!card)
2007 return 0;
2008
2009 rc = kstrtouint(buf, 0, &value);
2010 if (rc)
2011 return -EINVAL;
2012 /* TODO: sanity checks */
2013 card->lancmd_timeout = value;
2014
2015 return count;
2016
2017 }
2018
2019 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2020
2021 static ssize_t
2022 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2023 const char *buf, size_t count)
2024 {
2025 struct lcs_card *card = dev_get_drvdata(dev);
2026 char *tmp;
2027 int i;
2028
2029 if (!card)
2030 return -EINVAL;
2031 if (card->state != DEV_STATE_UP)
2032 return -EPERM;
2033 i = simple_strtoul(buf, &tmp, 16);
2034 if (i == 1)
2035 lcs_schedule_recovery(card);
2036 return count;
2037 }
2038
2039 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2040
2041 static struct attribute * lcs_attrs[] = {
2042 &dev_attr_portno.attr,
2043 &dev_attr_type.attr,
2044 &dev_attr_lancmd_timeout.attr,
2045 &dev_attr_recover.attr,
2046 NULL,
2047 };
2048 static struct attribute_group lcs_attr_group = {
2049 .attrs = lcs_attrs,
2050 };
2051 static const struct attribute_group *lcs_attr_groups[] = {
2052 &lcs_attr_group,
2053 NULL,
2054 };
2055 static const struct device_type lcs_devtype = {
2056 .name = "lcs",
2057 .groups = lcs_attr_groups,
2058 };
2059
2060 /**
2061 * lcs_probe_device is called on establishing a new ccwgroup_device.
2062 */
2063 static int
2064 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2065 {
2066 struct lcs_card *card;
2067
2068 if (!get_device(&ccwgdev->dev))
2069 return -ENODEV;
2070
2071 LCS_DBF_TEXT(2, setup, "add_dev");
2072 card = lcs_alloc_card();
2073 if (!card) {
2074 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2075 put_device(&ccwgdev->dev);
2076 return -ENOMEM;
2077 }
2078 dev_set_drvdata(&ccwgdev->dev, card);
2079 ccwgdev->cdev[0]->handler = lcs_irq;
2080 ccwgdev->cdev[1]->handler = lcs_irq;
2081 card->gdev = ccwgdev;
2082 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2083 card->thread_start_mask = 0;
2084 card->thread_allowed_mask = 0;
2085 card->thread_running_mask = 0;
2086 ccwgdev->dev.type = &lcs_devtype;
2087
2088 return 0;
2089 }
2090
2091 static int
2092 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2093 {
2094 struct lcs_card *card;
2095
2096 LCS_DBF_TEXT(2, setup, "regnetdv");
2097 card = dev_get_drvdata(&ccwgdev->dev);
2098 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2099 return 0;
2100 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2101 return register_netdev(card->dev);
2102 }
2103
2104 /**
2105 * lcs_new_device will be called by setting the group device online.
2106 */
2107 static const struct net_device_ops lcs_netdev_ops = {
2108 .ndo_open = lcs_open_device,
2109 .ndo_stop = lcs_stop_device,
2110 .ndo_get_stats = lcs_getstats,
2111 .ndo_start_xmit = lcs_start_xmit,
2112 };
2113
2114 static const struct net_device_ops lcs_mc_netdev_ops = {
2115 .ndo_open = lcs_open_device,
2116 .ndo_stop = lcs_stop_device,
2117 .ndo_get_stats = lcs_getstats,
2118 .ndo_start_xmit = lcs_start_xmit,
2119 .ndo_set_rx_mode = lcs_set_multicast_list,
2120 };
2121
2122 static int
2123 lcs_new_device(struct ccwgroup_device *ccwgdev)
2124 {
2125 struct lcs_card *card;
2126 struct net_device *dev=NULL;
2127 enum lcs_dev_states recover_state;
2128 int rc;
2129
2130 card = dev_get_drvdata(&ccwgdev->dev);
2131 if (!card)
2132 return -ENODEV;
2133
2134 LCS_DBF_TEXT(2, setup, "newdev");
2135 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2136 card->read.ccwdev = ccwgdev->cdev[0];
2137 card->write.ccwdev = ccwgdev->cdev[1];
2138
2139 recover_state = card->state;
2140 rc = ccw_device_set_online(card->read.ccwdev);
2141 if (rc)
2142 goto out_err;
2143 rc = ccw_device_set_online(card->write.ccwdev);
2144 if (rc)
2145 goto out_werr;
2146
2147 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2148
2149 lcs_setup_card(card);
2150 rc = lcs_detect(card);
2151 if (rc) {
2152 LCS_DBF_TEXT(2, setup, "dtctfail");
2153 dev_err(&ccwgdev->dev,
2154 "Detecting a network adapter for LCS devices"
2155 " failed with rc=%d (0x%x)\n", rc, rc);
2156 lcs_stopcard(card);
2157 goto out;
2158 }
2159 if (card->dev) {
2160 LCS_DBF_TEXT(2, setup, "samedev");
2161 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2162 goto netdev_out;
2163 }
2164 switch (card->lan_type) {
2165 #ifdef CONFIG_ETHERNET
2166 case LCS_FRAME_TYPE_ENET:
2167 card->lan_type_trans = eth_type_trans;
2168 dev = alloc_etherdev(0);
2169 break;
2170 #endif
2171 #ifdef CONFIG_FDDI
2172 case LCS_FRAME_TYPE_FDDI:
2173 card->lan_type_trans = fddi_type_trans;
2174 dev = alloc_fddidev(0);
2175 break;
2176 #endif
2177 default:
2178 LCS_DBF_TEXT(3, setup, "errinit");
2179 pr_err(" Initialization failed\n");
2180 goto out;
2181 }
2182 if (!dev)
2183 goto out;
2184 card->dev = dev;
2185 card->dev->ml_priv = card;
2186 card->dev->netdev_ops = &lcs_netdev_ops;
2187 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2188 #ifdef CONFIG_IP_MULTICAST
2189 if (!lcs_check_multicast_support(card))
2190 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2191 #endif
2192 netdev_out:
2193 lcs_set_allowed_threads(card,0xffffffff);
2194 if (recover_state == DEV_STATE_RECOVER) {
2195 lcs_set_multicast_list(card->dev);
2196 card->dev->flags |= IFF_UP;
2197 netif_carrier_on(card->dev);
2198 netif_wake_queue(card->dev);
2199 card->state = DEV_STATE_UP;
2200 } else {
2201 lcs_stopcard(card);
2202 }
2203
2204 if (lcs_register_netdev(ccwgdev) != 0)
2205 goto out;
2206
2207 /* Print out supported assists: IPv6 */
2208 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2209 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2210 "with" : "without");
2211 /* Print out supported assist: Multicast */
2212 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2213 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2214 "with" : "without");
2215 return 0;
2216 out:
2217
2218 ccw_device_set_offline(card->write.ccwdev);
2219 out_werr:
2220 ccw_device_set_offline(card->read.ccwdev);
2221 out_err:
2222 return -ENODEV;
2223 }
2224
2225 /**
2226 * lcs_shutdown_device, called when setting the group device offline.
2227 */
2228 static int
2229 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2230 {
2231 struct lcs_card *card;
2232 enum lcs_dev_states recover_state;
2233 int ret = 0, ret2 = 0, ret3 = 0;
2234
2235 LCS_DBF_TEXT(3, setup, "shtdndev");
2236 card = dev_get_drvdata(&ccwgdev->dev);
2237 if (!card)
2238 return -ENODEV;
2239 if (recovery_mode == 0) {
2240 lcs_set_allowed_threads(card, 0);
2241 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2242 return -ERESTARTSYS;
2243 }
2244 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2245 recover_state = card->state;
2246
2247 ret = lcs_stop_device(card->dev);
2248 ret2 = ccw_device_set_offline(card->read.ccwdev);
2249 ret3 = ccw_device_set_offline(card->write.ccwdev);
2250 if (!ret)
2251 ret = (ret2) ? ret2 : ret3;
2252 if (ret)
2253 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2254 if (recover_state == DEV_STATE_UP) {
2255 card->state = DEV_STATE_RECOVER;
2256 }
2257 return 0;
2258 }
2259
2260 static int
2261 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2262 {
2263 return __lcs_shutdown_device(ccwgdev, 0);
2264 }
2265
2266 /**
2267 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2268 */
2269 static int
2270 lcs_recovery(void *ptr)
2271 {
2272 struct lcs_card *card;
2273 struct ccwgroup_device *gdev;
2274 int rc;
2275
2276 card = (struct lcs_card *) ptr;
2277
2278 LCS_DBF_TEXT(4, trace, "recover1");
2279 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2280 return 0;
2281 LCS_DBF_TEXT(4, trace, "recover2");
2282 gdev = card->gdev;
2283 dev_warn(&gdev->dev,
2284 "A recovery process has been started for the LCS device\n");
2285 rc = __lcs_shutdown_device(gdev, 1);
2286 rc = lcs_new_device(gdev);
2287 if (!rc)
2288 pr_info("Device %s successfully recovered!\n",
2289 card->dev->name);
2290 else
2291 pr_info("Device %s could not be recovered!\n",
2292 card->dev->name);
2293 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2294 return 0;
2295 }
2296
2297 /**
2298 * lcs_remove_device, free buffers and card
2299 */
2300 static void
2301 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2302 {
2303 struct lcs_card *card;
2304
2305 card = dev_get_drvdata(&ccwgdev->dev);
2306 if (!card)
2307 return;
2308
2309 LCS_DBF_TEXT(3, setup, "remdev");
2310 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2311 if (ccwgdev->state == CCWGROUP_ONLINE) {
2312 lcs_shutdown_device(ccwgdev);
2313 }
2314 if (card->dev)
2315 unregister_netdev(card->dev);
2316 lcs_cleanup_card(card);
2317 lcs_free_card(card);
2318 dev_set_drvdata(&ccwgdev->dev, NULL);
2319 put_device(&ccwgdev->dev);
2320 }
2321
2322 static int lcs_pm_suspend(struct lcs_card *card)
2323 {
2324 if (card->dev)
2325 netif_device_detach(card->dev);
2326 lcs_set_allowed_threads(card, 0);
2327 lcs_wait_for_threads(card, 0xffffffff);
2328 if (card->state != DEV_STATE_DOWN)
2329 __lcs_shutdown_device(card->gdev, 1);
2330 return 0;
2331 }
2332
2333 static int lcs_pm_resume(struct lcs_card *card)
2334 {
2335 int rc = 0;
2336
2337 if (card->state == DEV_STATE_RECOVER)
2338 rc = lcs_new_device(card->gdev);
2339 if (card->dev)
2340 netif_device_attach(card->dev);
2341 if (rc) {
2342 dev_warn(&card->gdev->dev, "The lcs device driver "
2343 "failed to recover the device\n");
2344 }
2345 return rc;
2346 }
2347
2348 static int lcs_prepare(struct ccwgroup_device *gdev)
2349 {
2350 return 0;
2351 }
2352
2353 static void lcs_complete(struct ccwgroup_device *gdev)
2354 {
2355 return;
2356 }
2357
2358 static int lcs_freeze(struct ccwgroup_device *gdev)
2359 {
2360 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2361 return lcs_pm_suspend(card);
2362 }
2363
2364 static int lcs_thaw(struct ccwgroup_device *gdev)
2365 {
2366 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2367 return lcs_pm_resume(card);
2368 }
2369
2370 static int lcs_restore(struct ccwgroup_device *gdev)
2371 {
2372 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2373 return lcs_pm_resume(card);
2374 }
2375
2376 static struct ccw_device_id lcs_ids[] = {
2377 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2378 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2379 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2380 {},
2381 };
2382 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2383
2384 static struct ccw_driver lcs_ccw_driver = {
2385 .driver = {
2386 .owner = THIS_MODULE,
2387 .name = "lcs",
2388 },
2389 .ids = lcs_ids,
2390 .probe = ccwgroup_probe_ccwdev,
2391 .remove = ccwgroup_remove_ccwdev,
2392 .int_class = IRQIO_LCS,
2393 };
2394
2395 /**
2396 * LCS ccwgroup driver registration
2397 */
2398 static struct ccwgroup_driver lcs_group_driver = {
2399 .driver = {
2400 .owner = THIS_MODULE,
2401 .name = "lcs",
2402 },
2403 .setup = lcs_probe_device,
2404 .remove = lcs_remove_device,
2405 .set_online = lcs_new_device,
2406 .set_offline = lcs_shutdown_device,
2407 .prepare = lcs_prepare,
2408 .complete = lcs_complete,
2409 .freeze = lcs_freeze,
2410 .thaw = lcs_thaw,
2411 .restore = lcs_restore,
2412 };
2413
2414 static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2415 const char *buf, size_t count)
2416 {
2417 int err;
2418 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2419 return err ? err : count;
2420 }
2421 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2422
2423 static struct attribute *lcs_drv_attrs[] = {
2424 &driver_attr_group.attr,
2425 NULL,
2426 };
2427 static struct attribute_group lcs_drv_attr_group = {
2428 .attrs = lcs_drv_attrs,
2429 };
2430 static const struct attribute_group *lcs_drv_attr_groups[] = {
2431 &lcs_drv_attr_group,
2432 NULL,
2433 };
2434
2435 /**
2436 * LCS Module/Kernel initialization function
2437 */
2438 static int
2439 __init lcs_init_module(void)
2440 {
2441 int rc;
2442
2443 pr_info("Loading %s\n", version);
2444 rc = lcs_register_debug_facility();
2445 LCS_DBF_TEXT(0, setup, "lcsinit");
2446 if (rc)
2447 goto out_err;
2448 lcs_root_dev = root_device_register("lcs");
2449 rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2450 if (rc)
2451 goto register_err;
2452 rc = ccw_driver_register(&lcs_ccw_driver);
2453 if (rc)
2454 goto ccw_err;
2455 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2456 rc = ccwgroup_driver_register(&lcs_group_driver);
2457 if (rc)
2458 goto ccwgroup_err;
2459 return 0;
2460
2461 ccwgroup_err:
2462 ccw_driver_unregister(&lcs_ccw_driver);
2463 ccw_err:
2464 root_device_unregister(lcs_root_dev);
2465 register_err:
2466 lcs_unregister_debug_facility();
2467 out_err:
2468 pr_err("Initializing the lcs device driver failed\n");
2469 return rc;
2470 }
2471
2472
2473 /**
2474 * LCS module cleanup function
2475 */
2476 static void
2477 __exit lcs_cleanup_module(void)
2478 {
2479 pr_info("Terminating lcs module.\n");
2480 LCS_DBF_TEXT(0, trace, "cleanup");
2481 ccwgroup_driver_unregister(&lcs_group_driver);
2482 ccw_driver_unregister(&lcs_ccw_driver);
2483 root_device_unregister(lcs_root_dev);
2484 lcs_unregister_debug_facility();
2485 }
2486
2487 module_init(lcs_init_module);
2488 module_exit(lcs_cleanup_module);
2489
2490 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2491 MODULE_LICENSE("GPL");
2492
Linux with added FPC-III support