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Linux 2.6.34-rc3
[pohmelfs.git] / drivers / s390 / net / lcs.c
blobf6cc46dc0501644ca5eef0f82646b4876056bd37
1 /*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #define KMSG_COMPONENT "lcs"
27 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29 #include <linux/module.h>
30 #include <linux/if.h>
31 #include <linux/netdevice.h>
32 #include <linux/etherdevice.h>
33 #include <linux/trdevice.h>
34 #include <linux/fddidevice.h>
35 #include <linux/inetdevice.h>
36 #include <linux/in.h>
37 #include <linux/igmp.h>
38 #include <linux/delay.h>
39 #include <linux/kthread.h>
40 #include <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_NET_ETHERNET) && \
53 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
54 #error Cannot compile lcs.c without some net devices switched on.
55 #endif
56
57 /**
58 * initialization string for output
59 */
60
61 static char version[] __initdata = "LCS driver";
62
63 /**
64 * the root device for lcs group devices
65 */
66 static struct device *lcs_root_dev;
67
68 /**
69 * Some prototypes.
70 */
71 static void lcs_tasklet(unsigned long);
72 static void lcs_start_kernel_thread(struct work_struct *);
73 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
74 #ifdef CONFIG_IP_MULTICAST
75 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
76 #endif /* CONFIG_IP_MULTICAST */
77 static int lcs_recovery(void *ptr);
78
79 /**
80 * Debug Facility Stuff
81 */
82 static char debug_buffer[255];
83 static debug_info_t *lcs_dbf_setup;
84 static debug_info_t *lcs_dbf_trace;
85
86 /**
87 * LCS Debug Facility functions
88 */
89 static void
90 lcs_unregister_debug_facility(void)
91 {
92 if (lcs_dbf_setup)
93 debug_unregister(lcs_dbf_setup);
94 if (lcs_dbf_trace)
95 debug_unregister(lcs_dbf_trace);
96 }
97
98 static int
99 lcs_register_debug_facility(void)
100 {
101 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
102 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
103 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
104 pr_err("Not enough memory for debug facility.\n");
105 lcs_unregister_debug_facility();
106 return -ENOMEM;
107 }
108 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
109 debug_set_level(lcs_dbf_setup, 2);
110 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
111 debug_set_level(lcs_dbf_trace, 2);
112 return 0;
113 }
114
115 /**
116 * Allocate io buffers.
117 */
118 static int
119 lcs_alloc_channel(struct lcs_channel *channel)
120 {
121 int cnt;
122
123 LCS_DBF_TEXT(2, setup, "ichalloc");
124 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
125 /* alloc memory fo iobuffer */
126 channel->iob[cnt].data =
127 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
128 if (channel->iob[cnt].data == NULL)
129 break;
130 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
131 }
132 if (cnt < LCS_NUM_BUFFS) {
133 /* Not all io buffers could be allocated. */
134 LCS_DBF_TEXT(2, setup, "echalloc");
135 while (cnt-- > 0)
136 kfree(channel->iob[cnt].data);
137 return -ENOMEM;
138 }
139 return 0;
140 }
141
142 /**
143 * Free io buffers.
144 */
145 static void
146 lcs_free_channel(struct lcs_channel *channel)
147 {
148 int cnt;
149
150 LCS_DBF_TEXT(2, setup, "ichfree");
151 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
152 kfree(channel->iob[cnt].data);
153 channel->iob[cnt].data = NULL;
154 }
155 }
156
157 /*
158 * Cleanup channel.
159 */
160 static void
161 lcs_cleanup_channel(struct lcs_channel *channel)
162 {
163 LCS_DBF_TEXT(3, setup, "cleanch");
164 /* Kill write channel tasklets. */
165 tasklet_kill(&channel->irq_tasklet);
166 /* Free channel buffers. */
167 lcs_free_channel(channel);
168 }
169
170 /**
171 * LCS free memory for card and channels.
172 */
173 static void
174 lcs_free_card(struct lcs_card *card)
175 {
176 LCS_DBF_TEXT(2, setup, "remcard");
177 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
178 kfree(card);
179 }
180
181 /**
182 * LCS alloc memory for card and channels
183 */
184 static struct lcs_card *
185 lcs_alloc_card(void)
186 {
187 struct lcs_card *card;
188 int rc;
189
190 LCS_DBF_TEXT(2, setup, "alloclcs");
191
192 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
193 if (card == NULL)
194 return NULL;
195 card->lan_type = LCS_FRAME_TYPE_AUTO;
196 card->pkt_seq = 0;
197 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
198 /* Allocate io buffers for the read channel. */
199 rc = lcs_alloc_channel(&card->read);
200 if (rc){
201 LCS_DBF_TEXT(2, setup, "iccwerr");
202 lcs_free_card(card);
203 return NULL;
204 }
205 /* Allocate io buffers for the write channel. */
206 rc = lcs_alloc_channel(&card->write);
207 if (rc) {
208 LCS_DBF_TEXT(2, setup, "iccwerr");
209 lcs_cleanup_channel(&card->read);
210 lcs_free_card(card);
211 return NULL;
212 }
213
214 #ifdef CONFIG_IP_MULTICAST
215 INIT_LIST_HEAD(&card->ipm_list);
216 #endif
217 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
218 return card;
219 }
220
221 /*
222 * Setup read channel.
223 */
224 static void
225 lcs_setup_read_ccws(struct lcs_card *card)
226 {
227 int cnt;
228
229 LCS_DBF_TEXT(2, setup, "ireadccw");
230 /* Setup read ccws. */
231 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
232 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
233 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
234 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
235 card->read.ccws[cnt].flags =
236 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
237 /*
238 * Note: we have allocated the buffer with GFP_DMA, so
239 * we do not need to do set_normalized_cda.
240 */
241 card->read.ccws[cnt].cda =
242 (__u32) __pa(card->read.iob[cnt].data);
243 ((struct lcs_header *)
244 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
245 card->read.iob[cnt].callback = lcs_get_frames_cb;
246 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
247 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
248 }
249 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
250 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
251 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
252 /* Last ccw is a tic (transfer in channel). */
253 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
254 card->read.ccws[LCS_NUM_BUFFS].cda =
255 (__u32) __pa(card->read.ccws);
256 /* Setg initial state of the read channel. */
257 card->read.state = LCS_CH_STATE_INIT;
258
259 card->read.io_idx = 0;
260 card->read.buf_idx = 0;
261 }
262
263 static void
264 lcs_setup_read(struct lcs_card *card)
265 {
266 LCS_DBF_TEXT(3, setup, "initread");
267
268 lcs_setup_read_ccws(card);
269 /* Initialize read channel tasklet. */
270 card->read.irq_tasklet.data = (unsigned long) &card->read;
271 card->read.irq_tasklet.func = lcs_tasklet;
272 /* Initialize waitqueue. */
273 init_waitqueue_head(&card->read.wait_q);
274 }
275
276 /*
277 * Setup write channel.
278 */
279 static void
280 lcs_setup_write_ccws(struct lcs_card *card)
281 {
282 int cnt;
283
284 LCS_DBF_TEXT(3, setup, "iwritccw");
285 /* Setup write ccws. */
286 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
287 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
288 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
289 card->write.ccws[cnt].count = 0;
290 card->write.ccws[cnt].flags =
291 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
292 /*
293 * Note: we have allocated the buffer with GFP_DMA, so
294 * we do not need to do set_normalized_cda.
295 */
296 card->write.ccws[cnt].cda =
297 (__u32) __pa(card->write.iob[cnt].data);
298 }
299 /* Last ccw is a tic (transfer in channel). */
300 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
301 card->write.ccws[LCS_NUM_BUFFS].cda =
302 (__u32) __pa(card->write.ccws);
303 /* Set initial state of the write channel. */
304 card->read.state = LCS_CH_STATE_INIT;
305
306 card->write.io_idx = 0;
307 card->write.buf_idx = 0;
308 }
309
310 static void
311 lcs_setup_write(struct lcs_card *card)
312 {
313 LCS_DBF_TEXT(3, setup, "initwrit");
314
315 lcs_setup_write_ccws(card);
316 /* Initialize write channel tasklet. */
317 card->write.irq_tasklet.data = (unsigned long) &card->write;
318 card->write.irq_tasklet.func = lcs_tasklet;
319 /* Initialize waitqueue. */
320 init_waitqueue_head(&card->write.wait_q);
321 }
322
323 static void
324 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
325 {
326 unsigned long flags;
327
328 spin_lock_irqsave(&card->mask_lock, flags);
329 card->thread_allowed_mask = threads;
330 spin_unlock_irqrestore(&card->mask_lock, flags);
331 wake_up(&card->wait_q);
332 }
333 static inline int
334 lcs_threads_running(struct lcs_card *card, unsigned long threads)
335 {
336 unsigned long flags;
337 int rc = 0;
338
339 spin_lock_irqsave(&card->mask_lock, flags);
340 rc = (card->thread_running_mask & threads);
341 spin_unlock_irqrestore(&card->mask_lock, flags);
342 return rc;
343 }
344
345 static int
346 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
347 {
348 return wait_event_interruptible(card->wait_q,
349 lcs_threads_running(card, threads) == 0);
350 }
351
352 static inline int
353 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
354 {
355 unsigned long flags;
356
357 spin_lock_irqsave(&card->mask_lock, flags);
358 if ( !(card->thread_allowed_mask & thread) ||
359 (card->thread_start_mask & thread) ) {
360 spin_unlock_irqrestore(&card->mask_lock, flags);
361 return -EPERM;
362 }
363 card->thread_start_mask |= thread;
364 spin_unlock_irqrestore(&card->mask_lock, flags);
365 return 0;
366 }
367
368 static void
369 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
370 {
371 unsigned long flags;
372
373 spin_lock_irqsave(&card->mask_lock, flags);
374 card->thread_running_mask &= ~thread;
375 spin_unlock_irqrestore(&card->mask_lock, flags);
376 wake_up(&card->wait_q);
377 }
378
379 static inline int
380 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
381 {
382 unsigned long flags;
383 int rc = 0;
384
385 spin_lock_irqsave(&card->mask_lock, flags);
386 if (card->thread_start_mask & thread){
387 if ((card->thread_allowed_mask & thread) &&
388 !(card->thread_running_mask & thread)){
389 rc = 1;
390 card->thread_start_mask &= ~thread;
391 card->thread_running_mask |= thread;
392 } else
393 rc = -EPERM;
394 }
395 spin_unlock_irqrestore(&card->mask_lock, flags);
396 return rc;
397 }
398
399 static int
400 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
401 {
402 int rc = 0;
403 wait_event(card->wait_q,
404 (rc = __lcs_do_run_thread(card, thread)) >= 0);
405 return rc;
406 }
407
408 static int
409 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
410 {
411 unsigned long flags;
412 int rc = 0;
413
414 spin_lock_irqsave(&card->mask_lock, flags);
415 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
416 (u8) card->thread_start_mask,
417 (u8) card->thread_allowed_mask,
418 (u8) card->thread_running_mask);
419 rc = (card->thread_start_mask & thread);
420 spin_unlock_irqrestore(&card->mask_lock, flags);
421 return rc;
422 }
423
424 /**
425 * Initialize channels,card and state machines.
426 */
427 static void
428 lcs_setup_card(struct lcs_card *card)
429 {
430 LCS_DBF_TEXT(2, setup, "initcard");
431 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
432
433 lcs_setup_read(card);
434 lcs_setup_write(card);
435 /* Set cards initial state. */
436 card->state = DEV_STATE_DOWN;
437 card->tx_buffer = NULL;
438 card->tx_emitted = 0;
439
440 init_waitqueue_head(&card->wait_q);
441 spin_lock_init(&card->lock);
442 spin_lock_init(&card->ipm_lock);
443 spin_lock_init(&card->mask_lock);
444 #ifdef CONFIG_IP_MULTICAST
445 INIT_LIST_HEAD(&card->ipm_list);
446 #endif
447 INIT_LIST_HEAD(&card->lancmd_waiters);
448 }
449
450 static inline void
451 lcs_clear_multicast_list(struct lcs_card *card)
452 {
453 #ifdef CONFIG_IP_MULTICAST
454 struct lcs_ipm_list *ipm;
455 unsigned long flags;
456
457 /* Free multicast list. */
458 LCS_DBF_TEXT(3, setup, "clmclist");
459 spin_lock_irqsave(&card->ipm_lock, flags);
460 while (!list_empty(&card->ipm_list)){
461 ipm = list_entry(card->ipm_list.next,
462 struct lcs_ipm_list, list);
463 list_del(&ipm->list);
464 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
465 spin_unlock_irqrestore(&card->ipm_lock, flags);
466 lcs_send_delipm(card, ipm);
467 spin_lock_irqsave(&card->ipm_lock, flags);
468 }
469 kfree(ipm);
470 }
471 spin_unlock_irqrestore(&card->ipm_lock, flags);
472 #endif
473 }
474 /**
475 * Cleanup channels,card and state machines.
476 */
477 static void
478 lcs_cleanup_card(struct lcs_card *card)
479 {
480
481 LCS_DBF_TEXT(3, setup, "cleancrd");
482 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
483
484 if (card->dev != NULL)
485 free_netdev(card->dev);
486 /* Cleanup channels. */
487 lcs_cleanup_channel(&card->write);
488 lcs_cleanup_channel(&card->read);
489 }
490
491 /**
492 * Start channel.
493 */
494 static int
495 lcs_start_channel(struct lcs_channel *channel)
496 {
497 unsigned long flags;
498 int rc;
499
500 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
501 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
502 rc = ccw_device_start(channel->ccwdev,
503 channel->ccws + channel->io_idx, 0, 0,
504 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
505 if (rc == 0)
506 channel->state = LCS_CH_STATE_RUNNING;
507 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
508 if (rc) {
509 LCS_DBF_TEXT_(4,trace,"essh%s",
510 dev_name(&channel->ccwdev->dev));
511 dev_err(&channel->ccwdev->dev,
512 "Starting an LCS device resulted in an error,"
513 " rc=%d!\n", rc);
514 }
515 return rc;
516 }
517
518 static int
519 lcs_clear_channel(struct lcs_channel *channel)
520 {
521 unsigned long flags;
522 int rc;
523
524 LCS_DBF_TEXT(4,trace,"clearch");
525 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
526 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
527 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
528 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
529 if (rc) {
530 LCS_DBF_TEXT_(4, trace, "ecsc%s",
531 dev_name(&channel->ccwdev->dev));
532 return rc;
533 }
534 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
535 channel->state = LCS_CH_STATE_STOPPED;
536 return rc;
537 }
538
539
540 /**
541 * Stop channel.
542 */
543 static int
544 lcs_stop_channel(struct lcs_channel *channel)
545 {
546 unsigned long flags;
547 int rc;
548
549 if (channel->state == LCS_CH_STATE_STOPPED)
550 return 0;
551 LCS_DBF_TEXT(4,trace,"haltsch");
552 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
553 channel->state = LCS_CH_STATE_INIT;
554 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
555 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
556 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
557 if (rc) {
558 LCS_DBF_TEXT_(4, trace, "ehsc%s",
559 dev_name(&channel->ccwdev->dev));
560 return rc;
561 }
562 /* Asynchronous halt initialted. Wait for its completion. */
563 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
564 lcs_clear_channel(channel);
565 return 0;
566 }
567
568 /**
569 * start read and write channel
570 */
571 static int
572 lcs_start_channels(struct lcs_card *card)
573 {
574 int rc;
575
576 LCS_DBF_TEXT(2, trace, "chstart");
577 /* start read channel */
578 rc = lcs_start_channel(&card->read);
579 if (rc)
580 return rc;
581 /* start write channel */
582 rc = lcs_start_channel(&card->write);
583 if (rc)
584 lcs_stop_channel(&card->read);
585 return rc;
586 }
587
588 /**
589 * stop read and write channel
590 */
591 static int
592 lcs_stop_channels(struct lcs_card *card)
593 {
594 LCS_DBF_TEXT(2, trace, "chhalt");
595 lcs_stop_channel(&card->read);
596 lcs_stop_channel(&card->write);
597 return 0;
598 }
599
600 /**
601 * Get empty buffer.
602 */
603 static struct lcs_buffer *
604 __lcs_get_buffer(struct lcs_channel *channel)
605 {
606 int index;
607
608 LCS_DBF_TEXT(5, trace, "_getbuff");
609 index = channel->io_idx;
610 do {
611 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
612 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
613 return channel->iob + index;
614 }
615 index = (index + 1) & (LCS_NUM_BUFFS - 1);
616 } while (index != channel->io_idx);
617 return NULL;
618 }
619
620 static struct lcs_buffer *
621 lcs_get_buffer(struct lcs_channel *channel)
622 {
623 struct lcs_buffer *buffer;
624 unsigned long flags;
625
626 LCS_DBF_TEXT(5, trace, "getbuff");
627 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
628 buffer = __lcs_get_buffer(channel);
629 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
630 return buffer;
631 }
632
633 /**
634 * Resume channel program if the channel is suspended.
635 */
636 static int
637 __lcs_resume_channel(struct lcs_channel *channel)
638 {
639 int rc;
640
641 if (channel->state != LCS_CH_STATE_SUSPENDED)
642 return 0;
643 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
644 return 0;
645 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
646 rc = ccw_device_resume(channel->ccwdev);
647 if (rc) {
648 LCS_DBF_TEXT_(4, trace, "ersc%s",
649 dev_name(&channel->ccwdev->dev));
650 dev_err(&channel->ccwdev->dev,
651 "Sending data from the LCS device to the LAN failed"
652 " with rc=%d\n",rc);
653 } else
654 channel->state = LCS_CH_STATE_RUNNING;
655 return rc;
656
657 }
658
659 /**
660 * Make a buffer ready for processing.
661 */
662 static inline void
663 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
664 {
665 int prev, next;
666
667 LCS_DBF_TEXT(5, trace, "rdybits");
668 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
669 next = (index + 1) & (LCS_NUM_BUFFS - 1);
670 /* Check if we may clear the suspend bit of this buffer. */
671 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
672 /* Check if we have to set the PCI bit. */
673 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
674 /* Suspend bit of the previous buffer is not set. */
675 channel->ccws[index].flags |= CCW_FLAG_PCI;
676 /* Suspend bit of the next buffer is set. */
677 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
678 }
679 }
680
681 static int
682 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
683 {
684 unsigned long flags;
685 int index, rc;
686
687 LCS_DBF_TEXT(5, trace, "rdybuff");
688 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
689 buffer->state != LCS_BUF_STATE_PROCESSED);
690 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
691 buffer->state = LCS_BUF_STATE_READY;
692 index = buffer - channel->iob;
693 /* Set length. */
694 channel->ccws[index].count = buffer->count;
695 /* Check relevant PCI/suspend bits. */
696 __lcs_ready_buffer_bits(channel, index);
697 rc = __lcs_resume_channel(channel);
698 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
699 return rc;
700 }
701
702 /**
703 * Mark the buffer as processed. Take care of the suspend bit
704 * of the previous buffer. This function is called from
705 * interrupt context, so the lock must not be taken.
706 */
707 static int
708 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
709 {
710 int index, prev, next;
711
712 LCS_DBF_TEXT(5, trace, "prcsbuff");
713 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
714 buffer->state = LCS_BUF_STATE_PROCESSED;
715 index = buffer - channel->iob;
716 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
717 next = (index + 1) & (LCS_NUM_BUFFS - 1);
718 /* Set the suspend bit and clear the PCI bit of this buffer. */
719 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
720 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
721 /* Check the suspend bit of the previous buffer. */
722 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
723 /*
724 * Previous buffer is in state ready. It might have
725 * happened in lcs_ready_buffer that the suspend bit
726 * has not been cleared to avoid an endless loop.
727 * Do it now.
728 */
729 __lcs_ready_buffer_bits(channel, prev);
730 }
731 /* Clear PCI bit of next buffer. */
732 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
733 return __lcs_resume_channel(channel);
734 }
735
736 /**
737 * Put a processed buffer back to state empty.
738 */
739 static void
740 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
741 {
742 unsigned long flags;
743
744 LCS_DBF_TEXT(5, trace, "relbuff");
745 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
746 buffer->state != LCS_BUF_STATE_PROCESSED);
747 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
748 buffer->state = LCS_BUF_STATE_EMPTY;
749 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
750 }
751
752 /**
753 * Get buffer for a lan command.
754 */
755 static struct lcs_buffer *
756 lcs_get_lancmd(struct lcs_card *card, int count)
757 {
758 struct lcs_buffer *buffer;
759 struct lcs_cmd *cmd;
760
761 LCS_DBF_TEXT(4, trace, "getlncmd");
762 /* Get buffer and wait if none is available. */
763 wait_event(card->write.wait_q,
764 ((buffer = lcs_get_buffer(&card->write)) != NULL));
765 count += sizeof(struct lcs_header);
766 *(__u16 *)(buffer->data + count) = 0;
767 buffer->count = count + sizeof(__u16);
768 buffer->callback = lcs_release_buffer;
769 cmd = (struct lcs_cmd *) buffer->data;
770 cmd->offset = count;
771 cmd->type = LCS_FRAME_TYPE_CONTROL;
772 cmd->slot = 0;
773 return buffer;
774 }
775
776
777 static void
778 lcs_get_reply(struct lcs_reply *reply)
779 {
780 WARN_ON(atomic_read(&reply->refcnt) <= 0);
781 atomic_inc(&reply->refcnt);
782 }
783
784 static void
785 lcs_put_reply(struct lcs_reply *reply)
786 {
787 WARN_ON(atomic_read(&reply->refcnt) <= 0);
788 if (atomic_dec_and_test(&reply->refcnt)) {
789 kfree(reply);
790 }
791
792 }
793
794 static struct lcs_reply *
795 lcs_alloc_reply(struct lcs_cmd *cmd)
796 {
797 struct lcs_reply *reply;
798
799 LCS_DBF_TEXT(4, trace, "getreply");
800
801 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
802 if (!reply)
803 return NULL;
804 atomic_set(&reply->refcnt,1);
805 reply->sequence_no = cmd->sequence_no;
806 reply->received = 0;
807 reply->rc = 0;
808 init_waitqueue_head(&reply->wait_q);
809
810 return reply;
811 }
812
813 /**
814 * Notifier function for lancmd replies. Called from read irq.
815 */
816 static void
817 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
818 {
819 struct list_head *l, *n;
820 struct lcs_reply *reply;
821
822 LCS_DBF_TEXT(4, trace, "notiwait");
823 spin_lock(&card->lock);
824 list_for_each_safe(l, n, &card->lancmd_waiters) {
825 reply = list_entry(l, struct lcs_reply, list);
826 if (reply->sequence_no == cmd->sequence_no) {
827 lcs_get_reply(reply);
828 list_del_init(&reply->list);
829 if (reply->callback != NULL)
830 reply->callback(card, cmd);
831 reply->received = 1;
832 reply->rc = cmd->return_code;
833 wake_up(&reply->wait_q);
834 lcs_put_reply(reply);
835 break;
836 }
837 }
838 spin_unlock(&card->lock);
839 }
840
841 /**
842 * Emit buffer of a lan comand.
843 */
844 static void
845 lcs_lancmd_timeout(unsigned long data)
846 {
847 struct lcs_reply *reply, *list_reply, *r;
848 unsigned long flags;
849
850 LCS_DBF_TEXT(4, trace, "timeout");
851 reply = (struct lcs_reply *) data;
852 spin_lock_irqsave(&reply->card->lock, flags);
853 list_for_each_entry_safe(list_reply, r,
854 &reply->card->lancmd_waiters,list) {
855 if (reply == list_reply) {
856 lcs_get_reply(reply);
857 list_del_init(&reply->list);
858 spin_unlock_irqrestore(&reply->card->lock, flags);
859 reply->received = 1;
860 reply->rc = -ETIME;
861 wake_up(&reply->wait_q);
862 lcs_put_reply(reply);
863 return;
864 }
865 }
866 spin_unlock_irqrestore(&reply->card->lock, flags);
867 }
868
869 static int
870 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
871 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
872 {
873 struct lcs_reply *reply;
874 struct lcs_cmd *cmd;
875 struct timer_list timer;
876 unsigned long flags;
877 int rc;
878
879 LCS_DBF_TEXT(4, trace, "sendcmd");
880 cmd = (struct lcs_cmd *) buffer->data;
881 cmd->return_code = 0;
882 cmd->sequence_no = card->sequence_no++;
883 reply = lcs_alloc_reply(cmd);
884 if (!reply)
885 return -ENOMEM;
886 reply->callback = reply_callback;
887 reply->card = card;
888 spin_lock_irqsave(&card->lock, flags);
889 list_add_tail(&reply->list, &card->lancmd_waiters);
890 spin_unlock_irqrestore(&card->lock, flags);
891
892 buffer->callback = lcs_release_buffer;
893 rc = lcs_ready_buffer(&card->write, buffer);
894 if (rc)
895 return rc;
896 init_timer_on_stack(&timer);
897 timer.function = lcs_lancmd_timeout;
898 timer.data = (unsigned long) reply;
899 timer.expires = jiffies + HZ*card->lancmd_timeout;
900 add_timer(&timer);
901 wait_event(reply->wait_q, reply->received);
902 del_timer_sync(&timer);
903 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
904 rc = reply->rc;
905 lcs_put_reply(reply);
906 return rc ? -EIO : 0;
907 }
908
909 /**
910 * LCS startup command
911 */
912 static int
913 lcs_send_startup(struct lcs_card *card, __u8 initiator)
914 {
915 struct lcs_buffer *buffer;
916 struct lcs_cmd *cmd;
917
918 LCS_DBF_TEXT(2, trace, "startup");
919 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
920 cmd = (struct lcs_cmd *) buffer->data;
921 cmd->cmd_code = LCS_CMD_STARTUP;
922 cmd->initiator = initiator;
923 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
924 return lcs_send_lancmd(card, buffer, NULL);
925 }
926
927 /**
928 * LCS shutdown command
929 */
930 static int
931 lcs_send_shutdown(struct lcs_card *card)
932 {
933 struct lcs_buffer *buffer;
934 struct lcs_cmd *cmd;
935
936 LCS_DBF_TEXT(2, trace, "shutdown");
937 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
938 cmd = (struct lcs_cmd *) buffer->data;
939 cmd->cmd_code = LCS_CMD_SHUTDOWN;
940 cmd->initiator = LCS_INITIATOR_TCPIP;
941 return lcs_send_lancmd(card, buffer, NULL);
942 }
943
944 /**
945 * LCS lanstat command
946 */
947 static void
948 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
949 {
950 LCS_DBF_TEXT(2, trace, "statcb");
951 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
952 }
953
954 static int
955 lcs_send_lanstat(struct lcs_card *card)
956 {
957 struct lcs_buffer *buffer;
958 struct lcs_cmd *cmd;
959
960 LCS_DBF_TEXT(2,trace, "cmdstat");
961 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
962 cmd = (struct lcs_cmd *) buffer->data;
963 /* Setup lanstat command. */
964 cmd->cmd_code = LCS_CMD_LANSTAT;
965 cmd->initiator = LCS_INITIATOR_TCPIP;
966 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
967 cmd->cmd.lcs_std_cmd.portno = card->portno;
968 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
969 }
970
971 /**
972 * send stoplan command
973 */
974 static int
975 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
976 {
977 struct lcs_buffer *buffer;
978 struct lcs_cmd *cmd;
979
980 LCS_DBF_TEXT(2, trace, "cmdstpln");
981 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
982 cmd = (struct lcs_cmd *) buffer->data;
983 cmd->cmd_code = LCS_CMD_STOPLAN;
984 cmd->initiator = initiator;
985 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
986 cmd->cmd.lcs_std_cmd.portno = card->portno;
987 return lcs_send_lancmd(card, buffer, NULL);
988 }
989
990 /**
991 * send startlan command
992 */
993 static void
994 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
995 {
996 LCS_DBF_TEXT(2, trace, "srtlancb");
997 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
998 card->portno = cmd->cmd.lcs_std_cmd.portno;
999 }
1000
1001 static int
1002 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1003 {
1004 struct lcs_buffer *buffer;
1005 struct lcs_cmd *cmd;
1006
1007 LCS_DBF_TEXT(2, trace, "cmdstaln");
1008 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1009 cmd = (struct lcs_cmd *) buffer->data;
1010 cmd->cmd_code = LCS_CMD_STARTLAN;
1011 cmd->initiator = initiator;
1012 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1013 cmd->cmd.lcs_std_cmd.portno = card->portno;
1014 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1015 }
1016
1017 #ifdef CONFIG_IP_MULTICAST
1018 /**
1019 * send setipm command (Multicast)
1020 */
1021 static int
1022 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1023 {
1024 struct lcs_buffer *buffer;
1025 struct lcs_cmd *cmd;
1026
1027 LCS_DBF_TEXT(2, trace, "cmdsetim");
1028 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1029 cmd = (struct lcs_cmd *) buffer->data;
1030 cmd->cmd_code = LCS_CMD_SETIPM;
1031 cmd->initiator = LCS_INITIATOR_TCPIP;
1032 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1033 cmd->cmd.lcs_qipassist.portno = card->portno;
1034 cmd->cmd.lcs_qipassist.version = 4;
1035 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1036 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1037 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1038 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1039 return lcs_send_lancmd(card, buffer, NULL);
1040 }
1041
1042 /**
1043 * send delipm command (Multicast)
1044 */
1045 static int
1046 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1047 {
1048 struct lcs_buffer *buffer;
1049 struct lcs_cmd *cmd;
1050
1051 LCS_DBF_TEXT(2, trace, "cmddelim");
1052 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1053 cmd = (struct lcs_cmd *) buffer->data;
1054 cmd->cmd_code = LCS_CMD_DELIPM;
1055 cmd->initiator = LCS_INITIATOR_TCPIP;
1056 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1057 cmd->cmd.lcs_qipassist.portno = card->portno;
1058 cmd->cmd.lcs_qipassist.version = 4;
1059 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1060 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1061 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1062 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1063 return lcs_send_lancmd(card, buffer, NULL);
1064 }
1065
1066 /**
1067 * check if multicast is supported by LCS
1068 */
1069 static void
1070 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1071 {
1072 LCS_DBF_TEXT(2, trace, "chkmccb");
1073 card->ip_assists_supported =
1074 cmd->cmd.lcs_qipassist.ip_assists_supported;
1075 card->ip_assists_enabled =
1076 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1077 }
1078
1079 static int
1080 lcs_check_multicast_support(struct lcs_card *card)
1081 {
1082 struct lcs_buffer *buffer;
1083 struct lcs_cmd *cmd;
1084 int rc;
1085
1086 LCS_DBF_TEXT(2, trace, "cmdqipa");
1087 /* Send query ipassist. */
1088 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1089 cmd = (struct lcs_cmd *) buffer->data;
1090 cmd->cmd_code = LCS_CMD_QIPASSIST;
1091 cmd->initiator = LCS_INITIATOR_TCPIP;
1092 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1093 cmd->cmd.lcs_qipassist.portno = card->portno;
1094 cmd->cmd.lcs_qipassist.version = 4;
1095 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1096 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1097 if (rc != 0) {
1098 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1099 return -EOPNOTSUPP;
1100 }
1101 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1102 return 0;
1103 return -EOPNOTSUPP;
1104 }
1105
1106 /**
1107 * set or del multicast address on LCS card
1108 */
1109 static void
1110 lcs_fix_multicast_list(struct lcs_card *card)
1111 {
1112 struct list_head failed_list;
1113 struct lcs_ipm_list *ipm, *tmp;
1114 unsigned long flags;
1115 int rc;
1116
1117 LCS_DBF_TEXT(4,trace, "fixipm");
1118 INIT_LIST_HEAD(&failed_list);
1119 spin_lock_irqsave(&card->ipm_lock, flags);
1120 list_modified:
1121 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1122 switch (ipm->ipm_state) {
1123 case LCS_IPM_STATE_SET_REQUIRED:
1124 /* del from ipm_list so noone else can tamper with
1125 * this entry */
1126 list_del_init(&ipm->list);
1127 spin_unlock_irqrestore(&card->ipm_lock, flags);
1128 rc = lcs_send_setipm(card, ipm);
1129 spin_lock_irqsave(&card->ipm_lock, flags);
1130 if (rc) {
1131 pr_info("Adding multicast address failed."
1132 " Table possibly full!\n");
1133 /* store ipm in failed list -> will be added
1134 * to ipm_list again, so a retry will be done
1135 * during the next call of this function */
1136 list_add_tail(&ipm->list, &failed_list);
1137 } else {
1138 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1139 /* re-insert into ipm_list */
1140 list_add_tail(&ipm->list, &card->ipm_list);
1141 }
1142 goto list_modified;
1143 case LCS_IPM_STATE_DEL_REQUIRED:
1144 list_del(&ipm->list);
1145 spin_unlock_irqrestore(&card->ipm_lock, flags);
1146 lcs_send_delipm(card, ipm);
1147 spin_lock_irqsave(&card->ipm_lock, flags);
1148 kfree(ipm);
1149 goto list_modified;
1150 case LCS_IPM_STATE_ON_CARD:
1151 break;
1152 }
1153 }
1154 /* re-insert all entries from the failed_list into ipm_list */
1155 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1156 list_move_tail(&ipm->list, &card->ipm_list);
1157
1158 spin_unlock_irqrestore(&card->ipm_lock, flags);
1159 }
1160
1161 /**
1162 * get mac address for the relevant Multicast address
1163 */
1164 static void
1165 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1166 {
1167 LCS_DBF_TEXT(4,trace, "getmac");
1168 if (dev->type == ARPHRD_IEEE802_TR)
1169 ip_tr_mc_map(ipm, mac);
1170 else
1171 ip_eth_mc_map(ipm, mac);
1172 }
1173
1174 /**
1175 * function called by net device to handle multicast address relevant things
1176 */
1177 static inline void
1178 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1179 {
1180 struct ip_mc_list *im4;
1181 struct list_head *l;
1182 struct lcs_ipm_list *ipm;
1183 unsigned long flags;
1184 char buf[MAX_ADDR_LEN];
1185
1186 LCS_DBF_TEXT(4, trace, "remmclst");
1187 spin_lock_irqsave(&card->ipm_lock, flags);
1188 list_for_each(l, &card->ipm_list) {
1189 ipm = list_entry(l, struct lcs_ipm_list, list);
1190 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1191 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1192 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1193 (memcmp(buf, &ipm->ipm.mac_addr,
1194 LCS_MAC_LENGTH) == 0) )
1195 break;
1196 }
1197 if (im4 == NULL)
1198 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1199 }
1200 spin_unlock_irqrestore(&card->ipm_lock, flags);
1201 }
1202
1203 static inline struct lcs_ipm_list *
1204 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1205 {
1206 struct lcs_ipm_list *tmp, *ipm = NULL;
1207 struct list_head *l;
1208 unsigned long flags;
1209
1210 LCS_DBF_TEXT(4, trace, "chkmcent");
1211 spin_lock_irqsave(&card->ipm_lock, flags);
1212 list_for_each(l, &card->ipm_list) {
1213 tmp = list_entry(l, struct lcs_ipm_list, list);
1214 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1215 (memcmp(buf, &tmp->ipm.mac_addr,
1216 LCS_MAC_LENGTH) == 0) ) {
1217 ipm = tmp;
1218 break;
1219 }
1220 }
1221 spin_unlock_irqrestore(&card->ipm_lock, flags);
1222 return ipm;
1223 }
1224
1225 static inline void
1226 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1227 {
1228
1229 struct ip_mc_list *im4;
1230 struct lcs_ipm_list *ipm;
1231 char buf[MAX_ADDR_LEN];
1232 unsigned long flags;
1233
1234 LCS_DBF_TEXT(4, trace, "setmclst");
1235 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1236 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1237 ipm = lcs_check_addr_entry(card, im4, buf);
1238 if (ipm != NULL)
1239 continue; /* Address already in list. */
1240 ipm = (struct lcs_ipm_list *)
1241 kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1242 if (ipm == NULL) {
1243 pr_info("Not enough memory to add"
1244 " new multicast entry!\n");
1245 break;
1246 }
1247 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1248 ipm->ipm.ip_addr = im4->multiaddr;
1249 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1250 spin_lock_irqsave(&card->ipm_lock, flags);
1251 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1252 list_add(&ipm->list, &card->ipm_list);
1253 spin_unlock_irqrestore(&card->ipm_lock, flags);
1254 }
1255 }
1256
1257 static int
1258 lcs_register_mc_addresses(void *data)
1259 {
1260 struct lcs_card *card;
1261 struct in_device *in4_dev;
1262
1263 card = (struct lcs_card *) data;
1264
1265 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1266 return 0;
1267 LCS_DBF_TEXT(4, trace, "regmulti");
1268
1269 in4_dev = in_dev_get(card->dev);
1270 if (in4_dev == NULL)
1271 goto out;
1272 read_lock(&in4_dev->mc_list_lock);
1273 lcs_remove_mc_addresses(card,in4_dev);
1274 lcs_set_mc_addresses(card, in4_dev);
1275 read_unlock(&in4_dev->mc_list_lock);
1276 in_dev_put(in4_dev);
1277
1278 netif_carrier_off(card->dev);
1279 netif_tx_disable(card->dev);
1280 wait_event(card->write.wait_q,
1281 (card->write.state != LCS_CH_STATE_RUNNING));
1282 lcs_fix_multicast_list(card);
1283 if (card->state == DEV_STATE_UP) {
1284 netif_carrier_on(card->dev);
1285 netif_wake_queue(card->dev);
1286 }
1287 out:
1288 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1289 return 0;
1290 }
1291 #endif /* CONFIG_IP_MULTICAST */
1292
1293 /**
1294 * function called by net device to
1295 * handle multicast address relevant things
1296 */
1297 static void
1298 lcs_set_multicast_list(struct net_device *dev)
1299 {
1300 #ifdef CONFIG_IP_MULTICAST
1301 struct lcs_card *card;
1302
1303 LCS_DBF_TEXT(4, trace, "setmulti");
1304 card = (struct lcs_card *) dev->ml_priv;
1305
1306 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1307 schedule_work(&card->kernel_thread_starter);
1308 #endif /* CONFIG_IP_MULTICAST */
1309 }
1310
1311 static long
1312 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1313 {
1314 if (!IS_ERR(irb))
1315 return 0;
1316
1317 switch (PTR_ERR(irb)) {
1318 case -EIO:
1319 dev_warn(&cdev->dev,
1320 "An I/O-error occurred on the LCS device\n");
1321 LCS_DBF_TEXT(2, trace, "ckirberr");
1322 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1323 break;
1324 case -ETIMEDOUT:
1325 dev_warn(&cdev->dev,
1326 "A command timed out on the LCS device\n");
1327 LCS_DBF_TEXT(2, trace, "ckirberr");
1328 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1329 break;
1330 default:
1331 dev_warn(&cdev->dev,
1332 "An error occurred on the LCS device, rc=%ld\n",
1333 PTR_ERR(irb));
1334 LCS_DBF_TEXT(2, trace, "ckirberr");
1335 LCS_DBF_TEXT(2, trace, " rc???");
1336 }
1337 return PTR_ERR(irb);
1338 }
1339
1340 static int
1341 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1342 {
1343 int dstat, cstat;
1344 char *sense;
1345
1346 sense = (char *) irb->ecw;
1347 cstat = irb->scsw.cmd.cstat;
1348 dstat = irb->scsw.cmd.dstat;
1349
1350 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1351 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1352 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1353 LCS_DBF_TEXT(2, trace, "CGENCHK");
1354 return 1;
1355 }
1356 if (dstat & DEV_STAT_UNIT_CHECK) {
1357 if (sense[LCS_SENSE_BYTE_1] &
1358 LCS_SENSE_RESETTING_EVENT) {
1359 LCS_DBF_TEXT(2, trace, "REVIND");
1360 return 1;
1361 }
1362 if (sense[LCS_SENSE_BYTE_0] &
1363 LCS_SENSE_CMD_REJECT) {
1364 LCS_DBF_TEXT(2, trace, "CMDREJ");
1365 return 0;
1366 }
1367 if ((!sense[LCS_SENSE_BYTE_0]) &&
1368 (!sense[LCS_SENSE_BYTE_1]) &&
1369 (!sense[LCS_SENSE_BYTE_2]) &&
1370 (!sense[LCS_SENSE_BYTE_3])) {
1371 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1372 return 0;
1373 }
1374 LCS_DBF_TEXT(2, trace, "DGENCHK");
1375 return 1;
1376 }
1377 return 0;
1378 }
1379
1380 static void
1381 lcs_schedule_recovery(struct lcs_card *card)
1382 {
1383 LCS_DBF_TEXT(2, trace, "startrec");
1384 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1385 schedule_work(&card->kernel_thread_starter);
1386 }
1387
1388 /**
1389 * IRQ Handler for LCS channels
1390 */
1391 static void
1392 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1393 {
1394 struct lcs_card *card;
1395 struct lcs_channel *channel;
1396 int rc, index;
1397 int cstat, dstat;
1398
1399 if (lcs_check_irb_error(cdev, irb))
1400 return;
1401
1402 card = CARD_FROM_DEV(cdev);
1403 if (card->read.ccwdev == cdev)
1404 channel = &card->read;
1405 else
1406 channel = &card->write;
1407
1408 cstat = irb->scsw.cmd.cstat;
1409 dstat = irb->scsw.cmd.dstat;
1410 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1411 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1412 irb->scsw.cmd.dstat);
1413 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1414 irb->scsw.cmd.actl);
1415
1416 /* Check for channel and device errors presented */
1417 rc = lcs_get_problem(cdev, irb);
1418 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1419 dev_warn(&cdev->dev,
1420 "The LCS device stopped because of an error,"
1421 " dstat=0x%X, cstat=0x%X \n",
1422 dstat, cstat);
1423 if (rc) {
1424 channel->state = LCS_CH_STATE_ERROR;
1425 }
1426 }
1427 if (channel->state == LCS_CH_STATE_ERROR) {
1428 lcs_schedule_recovery(card);
1429 wake_up(&card->wait_q);
1430 return;
1431 }
1432 /* How far in the ccw chain have we processed? */
1433 if ((channel->state != LCS_CH_STATE_INIT) &&
1434 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1435 (irb->scsw.cmd.cpa != 0)) {
1436 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1437 - channel->ccws;
1438 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1439 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1440 /* Bloody io subsystem tells us lies about cpa... */
1441 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1442 while (channel->io_idx != index) {
1443 __lcs_processed_buffer(channel,
1444 channel->iob + channel->io_idx);
1445 channel->io_idx =
1446 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1447 }
1448 }
1449
1450 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1451 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1452 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1453 /* Mark channel as stopped. */
1454 channel->state = LCS_CH_STATE_STOPPED;
1455 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1456 /* CCW execution stopped on a suspend bit. */
1457 channel->state = LCS_CH_STATE_SUSPENDED;
1458 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1459 if (irb->scsw.cmd.cc != 0) {
1460 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1461 return;
1462 }
1463 /* The channel has been stopped by halt_IO. */
1464 channel->state = LCS_CH_STATE_HALTED;
1465 }
1466 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1467 channel->state = LCS_CH_STATE_CLEARED;
1468 /* Do the rest in the tasklet. */
1469 tasklet_schedule(&channel->irq_tasklet);
1470 }
1471
1472 /**
1473 * Tasklet for IRQ handler
1474 */
1475 static void
1476 lcs_tasklet(unsigned long data)
1477 {
1478 unsigned long flags;
1479 struct lcs_channel *channel;
1480 struct lcs_buffer *iob;
1481 int buf_idx;
1482 int rc;
1483
1484 channel = (struct lcs_channel *) data;
1485 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1486
1487 /* Check for processed buffers. */
1488 iob = channel->iob;
1489 buf_idx = channel->buf_idx;
1490 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1491 /* Do the callback thing. */
1492 if (iob[buf_idx].callback != NULL)
1493 iob[buf_idx].callback(channel, iob + buf_idx);
1494 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1495 }
1496 channel->buf_idx = buf_idx;
1497
1498 if (channel->state == LCS_CH_STATE_STOPPED)
1499 // FIXME: what if rc != 0 ??
1500 rc = lcs_start_channel(channel);
1501 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1502 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1503 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1504 // FIXME: what if rc != 0 ??
1505 rc = __lcs_resume_channel(channel);
1506 }
1507 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1508
1509 /* Something happened on the channel. Wake up waiters. */
1510 wake_up(&channel->wait_q);
1511 }
1512
1513 /**
1514 * Finish current tx buffer and make it ready for transmit.
1515 */
1516 static void
1517 __lcs_emit_txbuffer(struct lcs_card *card)
1518 {
1519 LCS_DBF_TEXT(5, trace, "emittx");
1520 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1521 card->tx_buffer->count += 2;
1522 lcs_ready_buffer(&card->write, card->tx_buffer);
1523 card->tx_buffer = NULL;
1524 card->tx_emitted++;
1525 }
1526
1527 /**
1528 * Callback for finished tx buffers.
1529 */
1530 static void
1531 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1532 {
1533 struct lcs_card *card;
1534
1535 LCS_DBF_TEXT(5, trace, "txbuffcb");
1536 /* Put buffer back to pool. */
1537 lcs_release_buffer(channel, buffer);
1538 card = container_of(channel, struct lcs_card, write);
1539 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1540 netif_wake_queue(card->dev);
1541 spin_lock(&card->lock);
1542 card->tx_emitted--;
1543 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1544 /*
1545 * Last running tx buffer has finished. Submit partially
1546 * filled current buffer.
1547 */
1548 __lcs_emit_txbuffer(card);
1549 spin_unlock(&card->lock);
1550 }
1551
1552 /**
1553 * Packet transmit function called by network stack
1554 */
1555 static int
1556 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1557 struct net_device *dev)
1558 {
1559 struct lcs_header *header;
1560 int rc = NETDEV_TX_OK;
1561
1562 LCS_DBF_TEXT(5, trace, "hardxmit");
1563 if (skb == NULL) {
1564 card->stats.tx_dropped++;
1565 card->stats.tx_errors++;
1566 return NETDEV_TX_OK;
1567 }
1568 if (card->state != DEV_STATE_UP) {
1569 dev_kfree_skb(skb);
1570 card->stats.tx_dropped++;
1571 card->stats.tx_errors++;
1572 card->stats.tx_carrier_errors++;
1573 return NETDEV_TX_OK;
1574 }
1575 if (skb->protocol == htons(ETH_P_IPV6)) {
1576 dev_kfree_skb(skb);
1577 return NETDEV_TX_OK;
1578 }
1579 netif_stop_queue(card->dev);
1580 spin_lock(&card->lock);
1581 if (card->tx_buffer != NULL &&
1582 card->tx_buffer->count + sizeof(struct lcs_header) +
1583 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1584 /* skb too big for current tx buffer. */
1585 __lcs_emit_txbuffer(card);
1586 if (card->tx_buffer == NULL) {
1587 /* Get new tx buffer */
1588 card->tx_buffer = lcs_get_buffer(&card->write);
1589 if (card->tx_buffer == NULL) {
1590 card->stats.tx_dropped++;
1591 rc = NETDEV_TX_BUSY;
1592 goto out;
1593 }
1594 card->tx_buffer->callback = lcs_txbuffer_cb;
1595 card->tx_buffer->count = 0;
1596 }
1597 header = (struct lcs_header *)
1598 (card->tx_buffer->data + card->tx_buffer->count);
1599 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1600 header->offset = card->tx_buffer->count;
1601 header->type = card->lan_type;
1602 header->slot = card->portno;
1603 skb_copy_from_linear_data(skb, header + 1, skb->len);
1604 spin_unlock(&card->lock);
1605 card->stats.tx_bytes += skb->len;
1606 card->stats.tx_packets++;
1607 dev_kfree_skb(skb);
1608 netif_wake_queue(card->dev);
1609 spin_lock(&card->lock);
1610 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1611 /* If this is the first tx buffer emit it immediately. */
1612 __lcs_emit_txbuffer(card);
1613 out:
1614 spin_unlock(&card->lock);
1615 return rc;
1616 }
1617
1618 static int
1619 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1620 {
1621 struct lcs_card *card;
1622 int rc;
1623
1624 LCS_DBF_TEXT(5, trace, "pktxmit");
1625 card = (struct lcs_card *) dev->ml_priv;
1626 rc = __lcs_start_xmit(card, skb, dev);
1627 return rc;
1628 }
1629
1630 /**
1631 * send startlan and lanstat command to make LCS device ready
1632 */
1633 static int
1634 lcs_startlan_auto(struct lcs_card *card)
1635 {
1636 int rc;
1637
1638 LCS_DBF_TEXT(2, trace, "strtauto");
1639 #ifdef CONFIG_NET_ETHERNET
1640 card->lan_type = LCS_FRAME_TYPE_ENET;
1641 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1642 if (rc == 0)
1643 return 0;
1644
1645 #endif
1646 #ifdef CONFIG_TR
1647 card->lan_type = LCS_FRAME_TYPE_TR;
1648 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1649 if (rc == 0)
1650 return 0;
1651 #endif
1652 #ifdef CONFIG_FDDI
1653 card->lan_type = LCS_FRAME_TYPE_FDDI;
1654 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1655 if (rc == 0)
1656 return 0;
1657 #endif
1658 return -EIO;
1659 }
1660
1661 static int
1662 lcs_startlan(struct lcs_card *card)
1663 {
1664 int rc, i;
1665
1666 LCS_DBF_TEXT(2, trace, "startlan");
1667 rc = 0;
1668 if (card->portno != LCS_INVALID_PORT_NO) {
1669 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1670 rc = lcs_startlan_auto(card);
1671 else
1672 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1673 } else {
1674 for (i = 0; i <= 16; i++) {
1675 card->portno = i;
1676 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1677 rc = lcs_send_startlan(card,
1678 LCS_INITIATOR_TCPIP);
1679 else
1680 /* autodetecting lan type */
1681 rc = lcs_startlan_auto(card);
1682 if (rc == 0)
1683 break;
1684 }
1685 }
1686 if (rc == 0)
1687 return lcs_send_lanstat(card);
1688 return rc;
1689 }
1690
1691 /**
1692 * LCS detect function
1693 * setup channels and make them I/O ready
1694 */
1695 static int
1696 lcs_detect(struct lcs_card *card)
1697 {
1698 int rc = 0;
1699
1700 LCS_DBF_TEXT(2, setup, "lcsdetct");
1701 /* start/reset card */
1702 if (card->dev)
1703 netif_stop_queue(card->dev);
1704 rc = lcs_stop_channels(card);
1705 if (rc == 0) {
1706 rc = lcs_start_channels(card);
1707 if (rc == 0) {
1708 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1709 if (rc == 0)
1710 rc = lcs_startlan(card);
1711 }
1712 }
1713 if (rc == 0) {
1714 card->state = DEV_STATE_UP;
1715 } else {
1716 card->state = DEV_STATE_DOWN;
1717 card->write.state = LCS_CH_STATE_INIT;
1718 card->read.state = LCS_CH_STATE_INIT;
1719 }
1720 return rc;
1721 }
1722
1723 /**
1724 * LCS Stop card
1725 */
1726 static int
1727 lcs_stopcard(struct lcs_card *card)
1728 {
1729 int rc;
1730
1731 LCS_DBF_TEXT(3, setup, "stopcard");
1732
1733 if (card->read.state != LCS_CH_STATE_STOPPED &&
1734 card->write.state != LCS_CH_STATE_STOPPED &&
1735 card->read.state != LCS_CH_STATE_ERROR &&
1736 card->write.state != LCS_CH_STATE_ERROR &&
1737 card->state == DEV_STATE_UP) {
1738 lcs_clear_multicast_list(card);
1739 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1740 rc = lcs_send_shutdown(card);
1741 }
1742 rc = lcs_stop_channels(card);
1743 card->state = DEV_STATE_DOWN;
1744
1745 return rc;
1746 }
1747
1748 /**
1749 * Kernel Thread helper functions for LGW initiated commands
1750 */
1751 static void
1752 lcs_start_kernel_thread(struct work_struct *work)
1753 {
1754 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1755 LCS_DBF_TEXT(5, trace, "krnthrd");
1756 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1757 kthread_run(lcs_recovery, card, "lcs_recover");
1758 #ifdef CONFIG_IP_MULTICAST
1759 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1760 kthread_run(lcs_register_mc_addresses, card, "regipm");
1761 #endif
1762 }
1763
1764 /**
1765 * Process control frames.
1766 */
1767 static void
1768 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1769 {
1770 LCS_DBF_TEXT(5, trace, "getctrl");
1771 if (cmd->initiator == LCS_INITIATOR_LGW) {
1772 switch(cmd->cmd_code) {
1773 case LCS_CMD_STARTUP:
1774 case LCS_CMD_STARTLAN:
1775 lcs_schedule_recovery(card);
1776 break;
1777 case LCS_CMD_STOPLAN:
1778 pr_warning("Stoplan for %s initiated by LGW.\n",
1779 card->dev->name);
1780 if (card->dev)
1781 netif_carrier_off(card->dev);
1782 break;
1783 default:
1784 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1785 break;
1786 }
1787 } else
1788 lcs_notify_lancmd_waiters(card, cmd);
1789 }
1790
1791 /**
1792 * Unpack network packet.
1793 */
1794 static void
1795 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1796 {
1797 struct sk_buff *skb;
1798
1799 LCS_DBF_TEXT(5, trace, "getskb");
1800 if (card->dev == NULL ||
1801 card->state != DEV_STATE_UP)
1802 /* The card isn't up. Ignore the packet. */
1803 return;
1804
1805 skb = dev_alloc_skb(skb_len);
1806 if (skb == NULL) {
1807 dev_err(&card->dev->dev,
1808 " Allocating a socket buffer to interface %s failed\n",
1809 card->dev->name);
1810 card->stats.rx_dropped++;
1811 return;
1812 }
1813 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1814 skb->protocol = card->lan_type_trans(skb, card->dev);
1815 card->stats.rx_bytes += skb_len;
1816 card->stats.rx_packets++;
1817 if (skb->protocol == htons(ETH_P_802_2))
1818 *((__u32 *)skb->cb) = ++card->pkt_seq;
1819 netif_rx(skb);
1820 }
1821
1822 /**
1823 * LCS main routine to get packets and lancmd replies from the buffers
1824 */
1825 static void
1826 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1827 {
1828 struct lcs_card *card;
1829 struct lcs_header *lcs_hdr;
1830 __u16 offset;
1831
1832 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1833 lcs_hdr = (struct lcs_header *) buffer->data;
1834 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1835 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1836 return;
1837 }
1838 card = container_of(channel, struct lcs_card, read);
1839 offset = 0;
1840 while (lcs_hdr->offset != 0) {
1841 if (lcs_hdr->offset <= 0 ||
1842 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1843 lcs_hdr->offset < offset) {
1844 /* Offset invalid. */
1845 card->stats.rx_length_errors++;
1846 card->stats.rx_errors++;
1847 return;
1848 }
1849 /* What kind of frame is it? */
1850 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1851 /* Control frame. */
1852 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1853 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1854 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1855 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1856 /* Normal network packet. */
1857 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1858 lcs_hdr->offset - offset -
1859 sizeof(struct lcs_header));
1860 else
1861 /* Unknown frame type. */
1862 ; // FIXME: error message ?
1863 /* Proceed to next frame. */
1864 offset = lcs_hdr->offset;
1865 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1866 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1867 }
1868 /* The buffer is now empty. Make it ready again. */
1869 lcs_ready_buffer(&card->read, buffer);
1870 }
1871
1872 /**
1873 * get network statistics for ifconfig and other user programs
1874 */
1875 static struct net_device_stats *
1876 lcs_getstats(struct net_device *dev)
1877 {
1878 struct lcs_card *card;
1879
1880 LCS_DBF_TEXT(4, trace, "netstats");
1881 card = (struct lcs_card *) dev->ml_priv;
1882 return &card->stats;
1883 }
1884
1885 /**
1886 * stop lcs device
1887 * This function will be called by user doing ifconfig xxx down
1888 */
1889 static int
1890 lcs_stop_device(struct net_device *dev)
1891 {
1892 struct lcs_card *card;
1893 int rc;
1894
1895 LCS_DBF_TEXT(2, trace, "stopdev");
1896 card = (struct lcs_card *) dev->ml_priv;
1897 netif_carrier_off(dev);
1898 netif_tx_disable(dev);
1899 dev->flags &= ~IFF_UP;
1900 wait_event(card->write.wait_q,
1901 (card->write.state != LCS_CH_STATE_RUNNING));
1902 rc = lcs_stopcard(card);
1903 if (rc)
1904 dev_err(&card->dev->dev,
1905 " Shutting down the LCS device failed\n ");
1906 return rc;
1907 }
1908
1909 /**
1910 * start lcs device and make it runnable
1911 * This function will be called by user doing ifconfig xxx up
1912 */
1913 static int
1914 lcs_open_device(struct net_device *dev)
1915 {
1916 struct lcs_card *card;
1917 int rc;
1918
1919 LCS_DBF_TEXT(2, trace, "opendev");
1920 card = (struct lcs_card *) dev->ml_priv;
1921 /* initialize statistics */
1922 rc = lcs_detect(card);
1923 if (rc) {
1924 pr_err("Error in opening device!\n");
1925
1926 } else {
1927 dev->flags |= IFF_UP;
1928 netif_carrier_on(dev);
1929 netif_wake_queue(dev);
1930 card->state = DEV_STATE_UP;
1931 }
1932 return rc;
1933 }
1934
1935 /**
1936 * show function for portno called by cat or similar things
1937 */
1938 static ssize_t
1939 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1940 {
1941 struct lcs_card *card;
1942
1943 card = dev_get_drvdata(dev);
1944
1945 if (!card)
1946 return 0;
1947
1948 return sprintf(buf, "%d\n", card->portno);
1949 }
1950
1951 /**
1952 * store the value which is piped to file portno
1953 */
1954 static ssize_t
1955 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1956 {
1957 struct lcs_card *card;
1958 int value;
1959
1960 card = dev_get_drvdata(dev);
1961
1962 if (!card)
1963 return 0;
1964
1965 sscanf(buf, "%u", &value);
1966 /* TODO: sanity checks */
1967 card->portno = value;
1968
1969 return count;
1970
1971 }
1972
1973 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1974
1975 const char *lcs_type[] = {
1976 "not a channel",
1977 "2216 parallel",
1978 "2216 channel",
1979 "OSA LCS card",
1980 "unknown channel type",
1981 "unsupported channel type",
1982 };
1983
1984 static ssize_t
1985 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1986 {
1987 struct ccwgroup_device *cgdev;
1988
1989 cgdev = to_ccwgroupdev(dev);
1990 if (!cgdev)
1991 return -ENODEV;
1992
1993 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1994 }
1995
1996 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1997
1998 static ssize_t
1999 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
2000 {
2001 struct lcs_card *card;
2002
2003 card = dev_get_drvdata(dev);
2004
2005 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2006 }
2007
2008 static ssize_t
2009 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2010 {
2011 struct lcs_card *card;
2012 int value;
2013
2014 card = dev_get_drvdata(dev);
2015
2016 if (!card)
2017 return 0;
2018
2019 sscanf(buf, "%u", &value);
2020 /* TODO: sanity checks */
2021 card->lancmd_timeout = value;
2022
2023 return count;
2024
2025 }
2026
2027 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2028
2029 static ssize_t
2030 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2031 const char *buf, size_t count)
2032 {
2033 struct lcs_card *card = dev_get_drvdata(dev);
2034 char *tmp;
2035 int i;
2036
2037 if (!card)
2038 return -EINVAL;
2039 if (card->state != DEV_STATE_UP)
2040 return -EPERM;
2041 i = simple_strtoul(buf, &tmp, 16);
2042 if (i == 1)
2043 lcs_schedule_recovery(card);
2044 return count;
2045 }
2046
2047 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2048
2049 static struct attribute * lcs_attrs[] = {
2050 &dev_attr_portno.attr,
2051 &dev_attr_type.attr,
2052 &dev_attr_lancmd_timeout.attr,
2053 &dev_attr_recover.attr,
2054 NULL,
2055 };
2056
2057 static struct attribute_group lcs_attr_group = {
2058 .attrs = lcs_attrs,
2059 };
2060
2061 /**
2062 * lcs_probe_device is called on establishing a new ccwgroup_device.
2063 */
2064 static int
2065 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2066 {
2067 struct lcs_card *card;
2068 int ret;
2069
2070 if (!get_device(&ccwgdev->dev))
2071 return -ENODEV;
2072
2073 LCS_DBF_TEXT(2, setup, "add_dev");
2074 card = lcs_alloc_card();
2075 if (!card) {
2076 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2077 put_device(&ccwgdev->dev);
2078 return -ENOMEM;
2079 }
2080 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2081 if (ret) {
2082 lcs_free_card(card);
2083 put_device(&ccwgdev->dev);
2084 return ret;
2085 }
2086 dev_set_drvdata(&ccwgdev->dev, card);
2087 ccwgdev->cdev[0]->handler = lcs_irq;
2088 ccwgdev->cdev[1]->handler = lcs_irq;
2089 card->gdev = ccwgdev;
2090 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2091 card->thread_start_mask = 0;
2092 card->thread_allowed_mask = 0;
2093 card->thread_running_mask = 0;
2094 return 0;
2095 }
2096
2097 static int
2098 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2099 {
2100 struct lcs_card *card;
2101
2102 LCS_DBF_TEXT(2, setup, "regnetdv");
2103 card = dev_get_drvdata(&ccwgdev->dev);
2104 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2105 return 0;
2106 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2107 return register_netdev(card->dev);
2108 }
2109
2110 /**
2111 * lcs_new_device will be called by setting the group device online.
2112 */
2113 static const struct net_device_ops lcs_netdev_ops = {
2114 .ndo_open = lcs_open_device,
2115 .ndo_stop = lcs_stop_device,
2116 .ndo_get_stats = lcs_getstats,
2117 .ndo_start_xmit = lcs_start_xmit,
2118 };
2119
2120 static const struct net_device_ops lcs_mc_netdev_ops = {
2121 .ndo_open = lcs_open_device,
2122 .ndo_stop = lcs_stop_device,
2123 .ndo_get_stats = lcs_getstats,
2124 .ndo_start_xmit = lcs_start_xmit,
2125 .ndo_set_multicast_list = lcs_set_multicast_list,
2126 };
2127
2128 static int
2129 lcs_new_device(struct ccwgroup_device *ccwgdev)
2130 {
2131 struct lcs_card *card;
2132 struct net_device *dev=NULL;
2133 enum lcs_dev_states recover_state;
2134 int rc;
2135
2136 card = dev_get_drvdata(&ccwgdev->dev);
2137 if (!card)
2138 return -ENODEV;
2139
2140 LCS_DBF_TEXT(2, setup, "newdev");
2141 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2142 card->read.ccwdev = ccwgdev->cdev[0];
2143 card->write.ccwdev = ccwgdev->cdev[1];
2144
2145 recover_state = card->state;
2146 rc = ccw_device_set_online(card->read.ccwdev);
2147 if (rc)
2148 goto out_err;
2149 rc = ccw_device_set_online(card->write.ccwdev);
2150 if (rc)
2151 goto out_werr;
2152
2153 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2154
2155 lcs_setup_card(card);
2156 rc = lcs_detect(card);
2157 if (rc) {
2158 LCS_DBF_TEXT(2, setup, "dtctfail");
2159 dev_err(&card->dev->dev,
2160 "Detecting a network adapter for LCS devices"
2161 " failed with rc=%d (0x%x)\n", rc, rc);
2162 lcs_stopcard(card);
2163 goto out;
2164 }
2165 if (card->dev) {
2166 LCS_DBF_TEXT(2, setup, "samedev");
2167 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2168 goto netdev_out;
2169 }
2170 switch (card->lan_type) {
2171 #ifdef CONFIG_NET_ETHERNET
2172 case LCS_FRAME_TYPE_ENET:
2173 card->lan_type_trans = eth_type_trans;
2174 dev = alloc_etherdev(0);
2175 break;
2176 #endif
2177 #ifdef CONFIG_TR
2178 case LCS_FRAME_TYPE_TR:
2179 card->lan_type_trans = tr_type_trans;
2180 dev = alloc_trdev(0);
2181 break;
2182 #endif
2183 #ifdef CONFIG_FDDI
2184 case LCS_FRAME_TYPE_FDDI:
2185 card->lan_type_trans = fddi_type_trans;
2186 dev = alloc_fddidev(0);
2187 break;
2188 #endif
2189 default:
2190 LCS_DBF_TEXT(3, setup, "errinit");
2191 pr_err(" Initialization failed\n");
2192 goto out;
2193 }
2194 if (!dev)
2195 goto out;
2196 card->dev = dev;
2197 card->dev->ml_priv = card;
2198 card->dev->netdev_ops = &lcs_netdev_ops;
2199 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2200 #ifdef CONFIG_IP_MULTICAST
2201 if (!lcs_check_multicast_support(card))
2202 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2203 #endif
2204 netdev_out:
2205 lcs_set_allowed_threads(card,0xffffffff);
2206 if (recover_state == DEV_STATE_RECOVER) {
2207 lcs_set_multicast_list(card->dev);
2208 card->dev->flags |= IFF_UP;
2209 netif_carrier_on(card->dev);
2210 netif_wake_queue(card->dev);
2211 card->state = DEV_STATE_UP;
2212 } else {
2213 lcs_stopcard(card);
2214 }
2215
2216 if (lcs_register_netdev(ccwgdev) != 0)
2217 goto out;
2218
2219 /* Print out supported assists: IPv6 */
2220 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2221 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2222 "with" : "without");
2223 /* Print out supported assist: Multicast */
2224 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2225 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2226 "with" : "without");
2227 return 0;
2228 out:
2229
2230 ccw_device_set_offline(card->write.ccwdev);
2231 out_werr:
2232 ccw_device_set_offline(card->read.ccwdev);
2233 out_err:
2234 return -ENODEV;
2235 }
2236
2237 /**
2238 * lcs_shutdown_device, called when setting the group device offline.
2239 */
2240 static int
2241 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2242 {
2243 struct lcs_card *card;
2244 enum lcs_dev_states recover_state;
2245 int ret;
2246
2247 LCS_DBF_TEXT(3, setup, "shtdndev");
2248 card = dev_get_drvdata(&ccwgdev->dev);
2249 if (!card)
2250 return -ENODEV;
2251 if (recovery_mode == 0) {
2252 lcs_set_allowed_threads(card, 0);
2253 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2254 return -ERESTARTSYS;
2255 }
2256 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2257 recover_state = card->state;
2258
2259 ret = lcs_stop_device(card->dev);
2260 ret = ccw_device_set_offline(card->read.ccwdev);
2261 ret = ccw_device_set_offline(card->write.ccwdev);
2262 if (recover_state == DEV_STATE_UP) {
2263 card->state = DEV_STATE_RECOVER;
2264 }
2265 if (ret)
2266 return ret;
2267 return 0;
2268 }
2269
2270 static int
2271 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2272 {
2273 return __lcs_shutdown_device(ccwgdev, 0);
2274 }
2275
2276 /**
2277 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2278 */
2279 static int
2280 lcs_recovery(void *ptr)
2281 {
2282 struct lcs_card *card;
2283 struct ccwgroup_device *gdev;
2284 int rc;
2285
2286 card = (struct lcs_card *) ptr;
2287
2288 LCS_DBF_TEXT(4, trace, "recover1");
2289 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2290 return 0;
2291 LCS_DBF_TEXT(4, trace, "recover2");
2292 gdev = card->gdev;
2293 dev_warn(&gdev->dev,
2294 "A recovery process has been started for the LCS device\n");
2295 rc = __lcs_shutdown_device(gdev, 1);
2296 rc = lcs_new_device(gdev);
2297 if (!rc)
2298 pr_info("Device %s successfully recovered!\n",
2299 card->dev->name);
2300 else
2301 pr_info("Device %s could not be recovered!\n",
2302 card->dev->name);
2303 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2304 return 0;
2305 }
2306
2307 /**
2308 * lcs_remove_device, free buffers and card
2309 */
2310 static void
2311 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2312 {
2313 struct lcs_card *card;
2314
2315 card = dev_get_drvdata(&ccwgdev->dev);
2316 if (!card)
2317 return;
2318
2319 LCS_DBF_TEXT(3, setup, "remdev");
2320 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2321 if (ccwgdev->state == CCWGROUP_ONLINE) {
2322 lcs_shutdown_device(ccwgdev);
2323 }
2324 if (card->dev)
2325 unregister_netdev(card->dev);
2326 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2327 lcs_cleanup_card(card);
2328 lcs_free_card(card);
2329 put_device(&ccwgdev->dev);
2330 }
2331
2332 static int lcs_pm_suspend(struct lcs_card *card)
2333 {
2334 if (card->dev)
2335 netif_device_detach(card->dev);
2336 lcs_set_allowed_threads(card, 0);
2337 lcs_wait_for_threads(card, 0xffffffff);
2338 if (card->state != DEV_STATE_DOWN)
2339 __lcs_shutdown_device(card->gdev, 1);
2340 return 0;
2341 }
2342
2343 static int lcs_pm_resume(struct lcs_card *card)
2344 {
2345 int rc = 0;
2346
2347 if (card->state == DEV_STATE_RECOVER)
2348 rc = lcs_new_device(card->gdev);
2349 if (card->dev)
2350 netif_device_attach(card->dev);
2351 if (rc) {
2352 dev_warn(&card->gdev->dev, "The lcs device driver "
2353 "failed to recover the device\n");
2354 }
2355 return rc;
2356 }
2357
2358 static int lcs_prepare(struct ccwgroup_device *gdev)
2359 {
2360 return 0;
2361 }
2362
2363 static void lcs_complete(struct ccwgroup_device *gdev)
2364 {
2365 return;
2366 }
2367
2368 static int lcs_freeze(struct ccwgroup_device *gdev)
2369 {
2370 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2371 return lcs_pm_suspend(card);
2372 }
2373
2374 static int lcs_thaw(struct ccwgroup_device *gdev)
2375 {
2376 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2377 return lcs_pm_resume(card);
2378 }
2379
2380 static int lcs_restore(struct ccwgroup_device *gdev)
2381 {
2382 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2383 return lcs_pm_resume(card);
2384 }
2385
2386 static struct ccw_device_id lcs_ids[] = {
2387 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2388 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2389 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2390 {},
2391 };
2392 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2393
2394 static struct ccw_driver lcs_ccw_driver = {
2395 .owner = THIS_MODULE,
2396 .name = "lcs",
2397 .ids = lcs_ids,
2398 .probe = ccwgroup_probe_ccwdev,
2399 .remove = ccwgroup_remove_ccwdev,
2400 };
2401
2402 /**
2403 * LCS ccwgroup driver registration
2404 */
2405 static struct ccwgroup_driver lcs_group_driver = {
2406 .owner = THIS_MODULE,
2407 .name = "lcs",
2408 .max_slaves = 2,
2409 .driver_id = 0xD3C3E2,
2410 .probe = lcs_probe_device,
2411 .remove = lcs_remove_device,
2412 .set_online = lcs_new_device,
2413 .set_offline = lcs_shutdown_device,
2414 .prepare = lcs_prepare,
2415 .complete = lcs_complete,
2416 .freeze = lcs_freeze,
2417 .thaw = lcs_thaw,
2418 .restore = lcs_restore,
2419 };
2420
2421 static ssize_t
2422 lcs_driver_group_store(struct device_driver *ddrv, const char *buf,
2423 size_t count)
2424 {
2425 int err;
2426 err = ccwgroup_create_from_string(lcs_root_dev,
2427 lcs_group_driver.driver_id,
2428 &lcs_ccw_driver, 2, buf);
2429 return err ? err : count;
2430 }
2431
2432 static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2433
2434 static struct attribute *lcs_group_attrs[] = {
2435 &driver_attr_group.attr,
2436 NULL,
2437 };
2438
2439 static struct attribute_group lcs_group_attr_group = {
2440 .attrs = lcs_group_attrs,
2441 };
2442
2443 static const struct attribute_group *lcs_group_attr_groups[] = {
2444 &lcs_group_attr_group,
2445 NULL,
2446 };
2447
2448 /**
2449 * LCS Module/Kernel initialization function
2450 */
2451 static int
2452 __init lcs_init_module(void)
2453 {
2454 int rc;
2455
2456 pr_info("Loading %s\n", version);
2457 rc = lcs_register_debug_facility();
2458 LCS_DBF_TEXT(0, setup, "lcsinit");
2459 if (rc)
2460 goto out_err;
2461 lcs_root_dev = root_device_register("lcs");
2462 rc = IS_ERR(lcs_root_dev) ? PTR_ERR(lcs_root_dev) : 0;
2463 if (rc)
2464 goto register_err;
2465 rc = ccw_driver_register(&lcs_ccw_driver);
2466 if (rc)
2467 goto ccw_err;
2468 lcs_group_driver.driver.groups = lcs_group_attr_groups;
2469 rc = ccwgroup_driver_register(&lcs_group_driver);
2470 if (rc)
2471 goto ccwgroup_err;
2472 return 0;
2473
2474 ccwgroup_err:
2475 ccw_driver_unregister(&lcs_ccw_driver);
2476 ccw_err:
2477 root_device_unregister(lcs_root_dev);
2478 register_err:
2479 lcs_unregister_debug_facility();
2480 out_err:
2481 pr_err("Initializing the lcs device driver failed\n");
2482 return rc;
2483 }
2484
2485
2486 /**
2487 * LCS module cleanup function
2488 */
2489 static void
2490 __exit lcs_cleanup_module(void)
2491 {
2492 pr_info("Terminating lcs module.\n");
2493 LCS_DBF_TEXT(0, trace, "cleanup");
2494 driver_remove_file(&lcs_group_driver.driver,
2495 &driver_attr_group);
2496 ccwgroup_driver_unregister(&lcs_group_driver);
2497 ccw_driver_unregister(&lcs_ccw_driver);
2498 root_device_unregister(lcs_root_dev);
2499 lcs_unregister_debug_facility();
2500 }
2501
2502 module_init(lcs_init_module);
2503 module_exit(lcs_cleanup_module);
2504
2505 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2506 MODULE_LICENSE("GPL");
2507