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OMAP2/3: Add omap_type() for determining GP/EMU/HS
[linux-ginger.git] / drivers / s390 / net / lcs.c
bloba45bc24eb5f91627c03eabc94575a71ed0a6053f
1 /*
2 * linux/drivers/s390/net/lcs.c
3 *
4 * Linux for S/390 Lan Channel Station Network Driver
5 *
6 * Copyright (C) 1999-2001 IBM Deutschland Entwicklung GmbH,
7 * IBM Corporation
8 * Author(s): Original Code written by
9 * DJ Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com)
10 * Rewritten by
11 * Frank Pavlic (fpavlic@de.ibm.com) and
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version.
18 *
19 * This program is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
23 *
24 * You should have received a copy of the GNU General Public License
25 * along with this program; if not, write to the Free Software
26 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
27 */
28
29 #define KMSG_COMPONENT "lcs"
30 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
31
32 #include <linux/module.h>
33 #include <linux/if.h>
34 #include <linux/netdevice.h>
35 #include <linux/etherdevice.h>
36 #include <linux/trdevice.h>
37 #include <linux/fddidevice.h>
38 #include <linux/inetdevice.h>
39 #include <linux/in.h>
40 #include <linux/igmp.h>
41 #include <linux/delay.h>
42 #include <linux/kthread.h>
43 #include <net/arp.h>
44 #include <net/ip.h>
45
46 #include <asm/debug.h>
47 #include <asm/idals.h>
48 #include <asm/timex.h>
49 #include <linux/device.h>
50 #include <asm/ccwgroup.h>
51
52 #include "lcs.h"
53 #include "cu3088.h"
54
55
56 #if !defined(CONFIG_NET_ETHERNET) && \
57 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
58 #error Cannot compile lcs.c without some net devices switched on.
59 #endif
60
61 /**
62 * initialization string for output
63 */
64
65 static char version[] __initdata = "LCS driver";
66 static char debug_buffer[255];
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 debug_info_t *lcs_dbf_setup;
83 static debug_info_t *lcs_dbf_trace;
84
85 /**
86 * LCS Debug Facility functions
87 */
88 static void
89 lcs_unregister_debug_facility(void)
90 {
91 if (lcs_dbf_setup)
92 debug_unregister(lcs_dbf_setup);
93 if (lcs_dbf_trace)
94 debug_unregister(lcs_dbf_trace);
95 }
96
97 static int
98 lcs_register_debug_facility(void)
99 {
100 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
101 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
102 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
103 pr_err("Not enough memory for debug facility.\n");
104 lcs_unregister_debug_facility();
105 return -ENOMEM;
106 }
107 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
108 debug_set_level(lcs_dbf_setup, 2);
109 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
110 debug_set_level(lcs_dbf_trace, 2);
111 return 0;
112 }
113
114 /**
115 * Allocate io buffers.
116 */
117 static int
118 lcs_alloc_channel(struct lcs_channel *channel)
119 {
120 int cnt;
121
122 LCS_DBF_TEXT(2, setup, "ichalloc");
123 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
124 /* alloc memory fo iobuffer */
125 channel->iob[cnt].data =
126 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
127 if (channel->iob[cnt].data == NULL)
128 break;
129 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
130 }
131 if (cnt < LCS_NUM_BUFFS) {
132 /* Not all io buffers could be allocated. */
133 LCS_DBF_TEXT(2, setup, "echalloc");
134 while (cnt-- > 0)
135 kfree(channel->iob[cnt].data);
136 return -ENOMEM;
137 }
138 return 0;
139 }
140
141 /**
142 * Free io buffers.
143 */
144 static void
145 lcs_free_channel(struct lcs_channel *channel)
146 {
147 int cnt;
148
149 LCS_DBF_TEXT(2, setup, "ichfree");
150 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
151 kfree(channel->iob[cnt].data);
152 channel->iob[cnt].data = NULL;
153 }
154 }
155
156 /*
157 * Cleanup channel.
158 */
159 static void
160 lcs_cleanup_channel(struct lcs_channel *channel)
161 {
162 LCS_DBF_TEXT(3, setup, "cleanch");
163 /* Kill write channel tasklets. */
164 tasklet_kill(&channel->irq_tasklet);
165 /* Free channel buffers. */
166 lcs_free_channel(channel);
167 }
168
169 /**
170 * LCS free memory for card and channels.
171 */
172 static void
173 lcs_free_card(struct lcs_card *card)
174 {
175 LCS_DBF_TEXT(2, setup, "remcard");
176 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
177 kfree(card);
178 }
179
180 /**
181 * LCS alloc memory for card and channels
182 */
183 static struct lcs_card *
184 lcs_alloc_card(void)
185 {
186 struct lcs_card *card;
187 int rc;
188
189 LCS_DBF_TEXT(2, setup, "alloclcs");
190
191 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
192 if (card == NULL)
193 return NULL;
194 card->lan_type = LCS_FRAME_TYPE_AUTO;
195 card->pkt_seq = 0;
196 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
197 /* Allocate io buffers for the read channel. */
198 rc = lcs_alloc_channel(&card->read);
199 if (rc){
200 LCS_DBF_TEXT(2, setup, "iccwerr");
201 lcs_free_card(card);
202 return NULL;
203 }
204 /* Allocate io buffers for the write channel. */
205 rc = lcs_alloc_channel(&card->write);
206 if (rc) {
207 LCS_DBF_TEXT(2, setup, "iccwerr");
208 lcs_cleanup_channel(&card->read);
209 lcs_free_card(card);
210 return NULL;
211 }
212
213 #ifdef CONFIG_IP_MULTICAST
214 INIT_LIST_HEAD(&card->ipm_list);
215 #endif
216 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
217 return card;
218 }
219
220 /*
221 * Setup read channel.
222 */
223 static void
224 lcs_setup_read_ccws(struct lcs_card *card)
225 {
226 int cnt;
227
228 LCS_DBF_TEXT(2, setup, "ireadccw");
229 /* Setup read ccws. */
230 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
231 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
232 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
233 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
234 card->read.ccws[cnt].flags =
235 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
236 /*
237 * Note: we have allocated the buffer with GFP_DMA, so
238 * we do not need to do set_normalized_cda.
239 */
240 card->read.ccws[cnt].cda =
241 (__u32) __pa(card->read.iob[cnt].data);
242 ((struct lcs_header *)
243 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
244 card->read.iob[cnt].callback = lcs_get_frames_cb;
245 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
246 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
247 }
248 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
249 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
250 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
251 /* Last ccw is a tic (transfer in channel). */
252 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
253 card->read.ccws[LCS_NUM_BUFFS].cda =
254 (__u32) __pa(card->read.ccws);
255 /* Setg initial state of the read channel. */
256 card->read.state = LCS_CH_STATE_INIT;
257
258 card->read.io_idx = 0;
259 card->read.buf_idx = 0;
260 }
261
262 static void
263 lcs_setup_read(struct lcs_card *card)
264 {
265 LCS_DBF_TEXT(3, setup, "initread");
266
267 lcs_setup_read_ccws(card);
268 /* Initialize read channel tasklet. */
269 card->read.irq_tasklet.data = (unsigned long) &card->read;
270 card->read.irq_tasklet.func = lcs_tasklet;
271 /* Initialize waitqueue. */
272 init_waitqueue_head(&card->read.wait_q);
273 }
274
275 /*
276 * Setup write channel.
277 */
278 static void
279 lcs_setup_write_ccws(struct lcs_card *card)
280 {
281 int cnt;
282
283 LCS_DBF_TEXT(3, setup, "iwritccw");
284 /* Setup write ccws. */
285 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
286 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
287 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
288 card->write.ccws[cnt].count = 0;
289 card->write.ccws[cnt].flags =
290 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
291 /*
292 * Note: we have allocated the buffer with GFP_DMA, so
293 * we do not need to do set_normalized_cda.
294 */
295 card->write.ccws[cnt].cda =
296 (__u32) __pa(card->write.iob[cnt].data);
297 }
298 /* Last ccw is a tic (transfer in channel). */
299 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
300 card->write.ccws[LCS_NUM_BUFFS].cda =
301 (__u32) __pa(card->write.ccws);
302 /* Set initial state of the write channel. */
303 card->read.state = LCS_CH_STATE_INIT;
304
305 card->write.io_idx = 0;
306 card->write.buf_idx = 0;
307 }
308
309 static void
310 lcs_setup_write(struct lcs_card *card)
311 {
312 LCS_DBF_TEXT(3, setup, "initwrit");
313
314 lcs_setup_write_ccws(card);
315 /* Initialize write channel tasklet. */
316 card->write.irq_tasklet.data = (unsigned long) &card->write;
317 card->write.irq_tasklet.func = lcs_tasklet;
318 /* Initialize waitqueue. */
319 init_waitqueue_head(&card->write.wait_q);
320 }
321
322 static void
323 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
324 {
325 unsigned long flags;
326
327 spin_lock_irqsave(&card->mask_lock, flags);
328 card->thread_allowed_mask = threads;
329 spin_unlock_irqrestore(&card->mask_lock, flags);
330 wake_up(&card->wait_q);
331 }
332 static inline int
333 lcs_threads_running(struct lcs_card *card, unsigned long threads)
334 {
335 unsigned long flags;
336 int rc = 0;
337
338 spin_lock_irqsave(&card->mask_lock, flags);
339 rc = (card->thread_running_mask & threads);
340 spin_unlock_irqrestore(&card->mask_lock, flags);
341 return rc;
342 }
343
344 static int
345 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
346 {
347 return wait_event_interruptible(card->wait_q,
348 lcs_threads_running(card, threads) == 0);
349 }
350
351 static inline int
352 lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
353 {
354 unsigned long flags;
355
356 spin_lock_irqsave(&card->mask_lock, flags);
357 if ( !(card->thread_allowed_mask & thread) ||
358 (card->thread_start_mask & thread) ) {
359 spin_unlock_irqrestore(&card->mask_lock, flags);
360 return -EPERM;
361 }
362 card->thread_start_mask |= thread;
363 spin_unlock_irqrestore(&card->mask_lock, flags);
364 return 0;
365 }
366
367 static void
368 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
369 {
370 unsigned long flags;
371
372 spin_lock_irqsave(&card->mask_lock, flags);
373 card->thread_running_mask &= ~thread;
374 spin_unlock_irqrestore(&card->mask_lock, flags);
375 wake_up(&card->wait_q);
376 }
377
378 static inline int
379 __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
380 {
381 unsigned long flags;
382 int rc = 0;
383
384 spin_lock_irqsave(&card->mask_lock, flags);
385 if (card->thread_start_mask & thread){
386 if ((card->thread_allowed_mask & thread) &&
387 !(card->thread_running_mask & thread)){
388 rc = 1;
389 card->thread_start_mask &= ~thread;
390 card->thread_running_mask |= thread;
391 } else
392 rc = -EPERM;
393 }
394 spin_unlock_irqrestore(&card->mask_lock, flags);
395 return rc;
396 }
397
398 static int
399 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
400 {
401 int rc = 0;
402 wait_event(card->wait_q,
403 (rc = __lcs_do_run_thread(card, thread)) >= 0);
404 return rc;
405 }
406
407 static int
408 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
409 {
410 unsigned long flags;
411 int rc = 0;
412
413 spin_lock_irqsave(&card->mask_lock, flags);
414 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
415 (u8) card->thread_start_mask,
416 (u8) card->thread_allowed_mask,
417 (u8) card->thread_running_mask);
418 rc = (card->thread_start_mask & thread);
419 spin_unlock_irqrestore(&card->mask_lock, flags);
420 return rc;
421 }
422
423 /**
424 * Initialize channels,card and state machines.
425 */
426 static void
427 lcs_setup_card(struct lcs_card *card)
428 {
429 LCS_DBF_TEXT(2, setup, "initcard");
430 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
431
432 lcs_setup_read(card);
433 lcs_setup_write(card);
434 /* Set cards initial state. */
435 card->state = DEV_STATE_DOWN;
436 card->tx_buffer = NULL;
437 card->tx_emitted = 0;
438
439 init_waitqueue_head(&card->wait_q);
440 spin_lock_init(&card->lock);
441 spin_lock_init(&card->ipm_lock);
442 spin_lock_init(&card->mask_lock);
443 #ifdef CONFIG_IP_MULTICAST
444 INIT_LIST_HEAD(&card->ipm_list);
445 #endif
446 INIT_LIST_HEAD(&card->lancmd_waiters);
447 }
448
449 static inline void
450 lcs_clear_multicast_list(struct lcs_card *card)
451 {
452 #ifdef CONFIG_IP_MULTICAST
453 struct lcs_ipm_list *ipm;
454 unsigned long flags;
455
456 /* Free multicast list. */
457 LCS_DBF_TEXT(3, setup, "clmclist");
458 spin_lock_irqsave(&card->ipm_lock, flags);
459 while (!list_empty(&card->ipm_list)){
460 ipm = list_entry(card->ipm_list.next,
461 struct lcs_ipm_list, list);
462 list_del(&ipm->list);
463 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
464 spin_unlock_irqrestore(&card->ipm_lock, flags);
465 lcs_send_delipm(card, ipm);
466 spin_lock_irqsave(&card->ipm_lock, flags);
467 }
468 kfree(ipm);
469 }
470 spin_unlock_irqrestore(&card->ipm_lock, flags);
471 #endif
472 }
473 /**
474 * Cleanup channels,card and state machines.
475 */
476 static void
477 lcs_cleanup_card(struct lcs_card *card)
478 {
479
480 LCS_DBF_TEXT(3, setup, "cleancrd");
481 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
482
483 if (card->dev != NULL)
484 free_netdev(card->dev);
485 /* Cleanup channels. */
486 lcs_cleanup_channel(&card->write);
487 lcs_cleanup_channel(&card->read);
488 }
489
490 /**
491 * Start channel.
492 */
493 static int
494 lcs_start_channel(struct lcs_channel *channel)
495 {
496 unsigned long flags;
497 int rc;
498
499 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
500 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
501 rc = ccw_device_start(channel->ccwdev,
502 channel->ccws + channel->io_idx, 0, 0,
503 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
504 if (rc == 0)
505 channel->state = LCS_CH_STATE_RUNNING;
506 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
507 if (rc) {
508 LCS_DBF_TEXT_(4,trace,"essh%s",
509 dev_name(&channel->ccwdev->dev));
510 dev_err(&channel->ccwdev->dev,
511 "Starting an LCS device resulted in an error,"
512 " rc=%d!\n", rc);
513 }
514 return rc;
515 }
516
517 static int
518 lcs_clear_channel(struct lcs_channel *channel)
519 {
520 unsigned long flags;
521 int rc;
522
523 LCS_DBF_TEXT(4,trace,"clearch");
524 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
525 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
526 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
527 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
528 if (rc) {
529 LCS_DBF_TEXT_(4, trace, "ecsc%s",
530 dev_name(&channel->ccwdev->dev));
531 return rc;
532 }
533 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
534 channel->state = LCS_CH_STATE_STOPPED;
535 return rc;
536 }
537
538
539 /**
540 * Stop channel.
541 */
542 static int
543 lcs_stop_channel(struct lcs_channel *channel)
544 {
545 unsigned long flags;
546 int rc;
547
548 if (channel->state == LCS_CH_STATE_STOPPED)
549 return 0;
550 LCS_DBF_TEXT(4,trace,"haltsch");
551 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
552 channel->state = LCS_CH_STATE_INIT;
553 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
554 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
555 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
556 if (rc) {
557 LCS_DBF_TEXT_(4, trace, "ehsc%s",
558 dev_name(&channel->ccwdev->dev));
559 return rc;
560 }
561 /* Asynchronous halt initialted. Wait for its completion. */
562 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
563 lcs_clear_channel(channel);
564 return 0;
565 }
566
567 /**
568 * start read and write channel
569 */
570 static int
571 lcs_start_channels(struct lcs_card *card)
572 {
573 int rc;
574
575 LCS_DBF_TEXT(2, trace, "chstart");
576 /* start read channel */
577 rc = lcs_start_channel(&card->read);
578 if (rc)
579 return rc;
580 /* start write channel */
581 rc = lcs_start_channel(&card->write);
582 if (rc)
583 lcs_stop_channel(&card->read);
584 return rc;
585 }
586
587 /**
588 * stop read and write channel
589 */
590 static int
591 lcs_stop_channels(struct lcs_card *card)
592 {
593 LCS_DBF_TEXT(2, trace, "chhalt");
594 lcs_stop_channel(&card->read);
595 lcs_stop_channel(&card->write);
596 return 0;
597 }
598
599 /**
600 * Get empty buffer.
601 */
602 static struct lcs_buffer *
603 __lcs_get_buffer(struct lcs_channel *channel)
604 {
605 int index;
606
607 LCS_DBF_TEXT(5, trace, "_getbuff");
608 index = channel->io_idx;
609 do {
610 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
611 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
612 return channel->iob + index;
613 }
614 index = (index + 1) & (LCS_NUM_BUFFS - 1);
615 } while (index != channel->io_idx);
616 return NULL;
617 }
618
619 static struct lcs_buffer *
620 lcs_get_buffer(struct lcs_channel *channel)
621 {
622 struct lcs_buffer *buffer;
623 unsigned long flags;
624
625 LCS_DBF_TEXT(5, trace, "getbuff");
626 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
627 buffer = __lcs_get_buffer(channel);
628 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
629 return buffer;
630 }
631
632 /**
633 * Resume channel program if the channel is suspended.
634 */
635 static int
636 __lcs_resume_channel(struct lcs_channel *channel)
637 {
638 int rc;
639
640 if (channel->state != LCS_CH_STATE_SUSPENDED)
641 return 0;
642 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
643 return 0;
644 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
645 rc = ccw_device_resume(channel->ccwdev);
646 if (rc) {
647 LCS_DBF_TEXT_(4, trace, "ersc%s",
648 dev_name(&channel->ccwdev->dev));
649 dev_err(&channel->ccwdev->dev,
650 "Sending data from the LCS device to the LAN failed"
651 " with rc=%d\n",rc);
652 } else
653 channel->state = LCS_CH_STATE_RUNNING;
654 return rc;
655
656 }
657
658 /**
659 * Make a buffer ready for processing.
660 */
661 static inline void
662 __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
663 {
664 int prev, next;
665
666 LCS_DBF_TEXT(5, trace, "rdybits");
667 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
668 next = (index + 1) & (LCS_NUM_BUFFS - 1);
669 /* Check if we may clear the suspend bit of this buffer. */
670 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
671 /* Check if we have to set the PCI bit. */
672 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
673 /* Suspend bit of the previous buffer is not set. */
674 channel->ccws[index].flags |= CCW_FLAG_PCI;
675 /* Suspend bit of the next buffer is set. */
676 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
677 }
678 }
679
680 static int
681 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
682 {
683 unsigned long flags;
684 int index, rc;
685
686 LCS_DBF_TEXT(5, trace, "rdybuff");
687 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
688 buffer->state != LCS_BUF_STATE_PROCESSED);
689 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
690 buffer->state = LCS_BUF_STATE_READY;
691 index = buffer - channel->iob;
692 /* Set length. */
693 channel->ccws[index].count = buffer->count;
694 /* Check relevant PCI/suspend bits. */
695 __lcs_ready_buffer_bits(channel, index);
696 rc = __lcs_resume_channel(channel);
697 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
698 return rc;
699 }
700
701 /**
702 * Mark the buffer as processed. Take care of the suspend bit
703 * of the previous buffer. This function is called from
704 * interrupt context, so the lock must not be taken.
705 */
706 static int
707 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
708 {
709 int index, prev, next;
710
711 LCS_DBF_TEXT(5, trace, "prcsbuff");
712 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
713 buffer->state = LCS_BUF_STATE_PROCESSED;
714 index = buffer - channel->iob;
715 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
716 next = (index + 1) & (LCS_NUM_BUFFS - 1);
717 /* Set the suspend bit and clear the PCI bit of this buffer. */
718 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
719 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
720 /* Check the suspend bit of the previous buffer. */
721 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
722 /*
723 * Previous buffer is in state ready. It might have
724 * happened in lcs_ready_buffer that the suspend bit
725 * has not been cleared to avoid an endless loop.
726 * Do it now.
727 */
728 __lcs_ready_buffer_bits(channel, prev);
729 }
730 /* Clear PCI bit of next buffer. */
731 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
732 return __lcs_resume_channel(channel);
733 }
734
735 /**
736 * Put a processed buffer back to state empty.
737 */
738 static void
739 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
740 {
741 unsigned long flags;
742
743 LCS_DBF_TEXT(5, trace, "relbuff");
744 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
745 buffer->state != LCS_BUF_STATE_PROCESSED);
746 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
747 buffer->state = LCS_BUF_STATE_EMPTY;
748 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
749 }
750
751 /**
752 * Get buffer for a lan command.
753 */
754 static struct lcs_buffer *
755 lcs_get_lancmd(struct lcs_card *card, int count)
756 {
757 struct lcs_buffer *buffer;
758 struct lcs_cmd *cmd;
759
760 LCS_DBF_TEXT(4, trace, "getlncmd");
761 /* Get buffer and wait if none is available. */
762 wait_event(card->write.wait_q,
763 ((buffer = lcs_get_buffer(&card->write)) != NULL));
764 count += sizeof(struct lcs_header);
765 *(__u16 *)(buffer->data + count) = 0;
766 buffer->count = count + sizeof(__u16);
767 buffer->callback = lcs_release_buffer;
768 cmd = (struct lcs_cmd *) buffer->data;
769 cmd->offset = count;
770 cmd->type = LCS_FRAME_TYPE_CONTROL;
771 cmd->slot = 0;
772 return buffer;
773 }
774
775
776 static void
777 lcs_get_reply(struct lcs_reply *reply)
778 {
779 WARN_ON(atomic_read(&reply->refcnt) <= 0);
780 atomic_inc(&reply->refcnt);
781 }
782
783 static void
784 lcs_put_reply(struct lcs_reply *reply)
785 {
786 WARN_ON(atomic_read(&reply->refcnt) <= 0);
787 if (atomic_dec_and_test(&reply->refcnt)) {
788 kfree(reply);
789 }
790
791 }
792
793 static struct lcs_reply *
794 lcs_alloc_reply(struct lcs_cmd *cmd)
795 {
796 struct lcs_reply *reply;
797
798 LCS_DBF_TEXT(4, trace, "getreply");
799
800 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
801 if (!reply)
802 return NULL;
803 atomic_set(&reply->refcnt,1);
804 reply->sequence_no = cmd->sequence_no;
805 reply->received = 0;
806 reply->rc = 0;
807 init_waitqueue_head(&reply->wait_q);
808
809 return reply;
810 }
811
812 /**
813 * Notifier function for lancmd replies. Called from read irq.
814 */
815 static void
816 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
817 {
818 struct list_head *l, *n;
819 struct lcs_reply *reply;
820
821 LCS_DBF_TEXT(4, trace, "notiwait");
822 spin_lock(&card->lock);
823 list_for_each_safe(l, n, &card->lancmd_waiters) {
824 reply = list_entry(l, struct lcs_reply, list);
825 if (reply->sequence_no == cmd->sequence_no) {
826 lcs_get_reply(reply);
827 list_del_init(&reply->list);
828 if (reply->callback != NULL)
829 reply->callback(card, cmd);
830 reply->received = 1;
831 reply->rc = cmd->return_code;
832 wake_up(&reply->wait_q);
833 lcs_put_reply(reply);
834 break;
835 }
836 }
837 spin_unlock(&card->lock);
838 }
839
840 /**
841 * Emit buffer of a lan comand.
842 */
843 static void
844 lcs_lancmd_timeout(unsigned long data)
845 {
846 struct lcs_reply *reply, *list_reply, *r;
847 unsigned long flags;
848
849 LCS_DBF_TEXT(4, trace, "timeout");
850 reply = (struct lcs_reply *) data;
851 spin_lock_irqsave(&reply->card->lock, flags);
852 list_for_each_entry_safe(list_reply, r,
853 &reply->card->lancmd_waiters,list) {
854 if (reply == list_reply) {
855 lcs_get_reply(reply);
856 list_del_init(&reply->list);
857 spin_unlock_irqrestore(&reply->card->lock, flags);
858 reply->received = 1;
859 reply->rc = -ETIME;
860 wake_up(&reply->wait_q);
861 lcs_put_reply(reply);
862 return;
863 }
864 }
865 spin_unlock_irqrestore(&reply->card->lock, flags);
866 }
867
868 static int
869 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
870 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
871 {
872 struct lcs_reply *reply;
873 struct lcs_cmd *cmd;
874 struct timer_list timer;
875 unsigned long flags;
876 int rc;
877
878 LCS_DBF_TEXT(4, trace, "sendcmd");
879 cmd = (struct lcs_cmd *) buffer->data;
880 cmd->return_code = 0;
881 cmd->sequence_no = card->sequence_no++;
882 reply = lcs_alloc_reply(cmd);
883 if (!reply)
884 return -ENOMEM;
885 reply->callback = reply_callback;
886 reply->card = card;
887 spin_lock_irqsave(&card->lock, flags);
888 list_add_tail(&reply->list, &card->lancmd_waiters);
889 spin_unlock_irqrestore(&card->lock, flags);
890
891 buffer->callback = lcs_release_buffer;
892 rc = lcs_ready_buffer(&card->write, buffer);
893 if (rc)
894 return rc;
895 init_timer(&timer);
896 timer.function = lcs_lancmd_timeout;
897 timer.data = (unsigned long) reply;
898 timer.expires = jiffies + HZ*card->lancmd_timeout;
899 add_timer(&timer);
900 wait_event(reply->wait_q, reply->received);
901 del_timer_sync(&timer);
902 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
903 rc = reply->rc;
904 lcs_put_reply(reply);
905 return rc ? -EIO : 0;
906 }
907
908 /**
909 * LCS startup command
910 */
911 static int
912 lcs_send_startup(struct lcs_card *card, __u8 initiator)
913 {
914 struct lcs_buffer *buffer;
915 struct lcs_cmd *cmd;
916
917 LCS_DBF_TEXT(2, trace, "startup");
918 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
919 cmd = (struct lcs_cmd *) buffer->data;
920 cmd->cmd_code = LCS_CMD_STARTUP;
921 cmd->initiator = initiator;
922 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
923 return lcs_send_lancmd(card, buffer, NULL);
924 }
925
926 /**
927 * LCS shutdown command
928 */
929 static int
930 lcs_send_shutdown(struct lcs_card *card)
931 {
932 struct lcs_buffer *buffer;
933 struct lcs_cmd *cmd;
934
935 LCS_DBF_TEXT(2, trace, "shutdown");
936 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
937 cmd = (struct lcs_cmd *) buffer->data;
938 cmd->cmd_code = LCS_CMD_SHUTDOWN;
939 cmd->initiator = LCS_INITIATOR_TCPIP;
940 return lcs_send_lancmd(card, buffer, NULL);
941 }
942
943 /**
944 * LCS lanstat command
945 */
946 static void
947 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
948 {
949 LCS_DBF_TEXT(2, trace, "statcb");
950 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
951 }
952
953 static int
954 lcs_send_lanstat(struct lcs_card *card)
955 {
956 struct lcs_buffer *buffer;
957 struct lcs_cmd *cmd;
958
959 LCS_DBF_TEXT(2,trace, "cmdstat");
960 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
961 cmd = (struct lcs_cmd *) buffer->data;
962 /* Setup lanstat command. */
963 cmd->cmd_code = LCS_CMD_LANSTAT;
964 cmd->initiator = LCS_INITIATOR_TCPIP;
965 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
966 cmd->cmd.lcs_std_cmd.portno = card->portno;
967 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
968 }
969
970 /**
971 * send stoplan command
972 */
973 static int
974 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
975 {
976 struct lcs_buffer *buffer;
977 struct lcs_cmd *cmd;
978
979 LCS_DBF_TEXT(2, trace, "cmdstpln");
980 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
981 cmd = (struct lcs_cmd *) buffer->data;
982 cmd->cmd_code = LCS_CMD_STOPLAN;
983 cmd->initiator = initiator;
984 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
985 cmd->cmd.lcs_std_cmd.portno = card->portno;
986 return lcs_send_lancmd(card, buffer, NULL);
987 }
988
989 /**
990 * send startlan command
991 */
992 static void
993 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
994 {
995 LCS_DBF_TEXT(2, trace, "srtlancb");
996 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
997 card->portno = cmd->cmd.lcs_std_cmd.portno;
998 }
999
1000 static int
1001 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1002 {
1003 struct lcs_buffer *buffer;
1004 struct lcs_cmd *cmd;
1005
1006 LCS_DBF_TEXT(2, trace, "cmdstaln");
1007 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1008 cmd = (struct lcs_cmd *) buffer->data;
1009 cmd->cmd_code = LCS_CMD_STARTLAN;
1010 cmd->initiator = initiator;
1011 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1012 cmd->cmd.lcs_std_cmd.portno = card->portno;
1013 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1014 }
1015
1016 #ifdef CONFIG_IP_MULTICAST
1017 /**
1018 * send setipm command (Multicast)
1019 */
1020 static int
1021 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1022 {
1023 struct lcs_buffer *buffer;
1024 struct lcs_cmd *cmd;
1025
1026 LCS_DBF_TEXT(2, trace, "cmdsetim");
1027 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1028 cmd = (struct lcs_cmd *) buffer->data;
1029 cmd->cmd_code = LCS_CMD_SETIPM;
1030 cmd->initiator = LCS_INITIATOR_TCPIP;
1031 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1032 cmd->cmd.lcs_qipassist.portno = card->portno;
1033 cmd->cmd.lcs_qipassist.version = 4;
1034 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1035 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1036 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1037 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1038 return lcs_send_lancmd(card, buffer, NULL);
1039 }
1040
1041 /**
1042 * send delipm command (Multicast)
1043 */
1044 static int
1045 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1046 {
1047 struct lcs_buffer *buffer;
1048 struct lcs_cmd *cmd;
1049
1050 LCS_DBF_TEXT(2, trace, "cmddelim");
1051 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1052 cmd = (struct lcs_cmd *) buffer->data;
1053 cmd->cmd_code = LCS_CMD_DELIPM;
1054 cmd->initiator = LCS_INITIATOR_TCPIP;
1055 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1056 cmd->cmd.lcs_qipassist.portno = card->portno;
1057 cmd->cmd.lcs_qipassist.version = 4;
1058 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1059 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1060 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1061 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1062 return lcs_send_lancmd(card, buffer, NULL);
1063 }
1064
1065 /**
1066 * check if multicast is supported by LCS
1067 */
1068 static void
1069 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1070 {
1071 LCS_DBF_TEXT(2, trace, "chkmccb");
1072 card->ip_assists_supported =
1073 cmd->cmd.lcs_qipassist.ip_assists_supported;
1074 card->ip_assists_enabled =
1075 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1076 }
1077
1078 static int
1079 lcs_check_multicast_support(struct lcs_card *card)
1080 {
1081 struct lcs_buffer *buffer;
1082 struct lcs_cmd *cmd;
1083 int rc;
1084
1085 LCS_DBF_TEXT(2, trace, "cmdqipa");
1086 /* Send query ipassist. */
1087 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1088 cmd = (struct lcs_cmd *) buffer->data;
1089 cmd->cmd_code = LCS_CMD_QIPASSIST;
1090 cmd->initiator = LCS_INITIATOR_TCPIP;
1091 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1092 cmd->cmd.lcs_qipassist.portno = card->portno;
1093 cmd->cmd.lcs_qipassist.version = 4;
1094 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1095 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1096 if (rc != 0) {
1097 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1098 return -EOPNOTSUPP;
1099 }
1100 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1101 return 0;
1102 return -EOPNOTSUPP;
1103 }
1104
1105 /**
1106 * set or del multicast address on LCS card
1107 */
1108 static void
1109 lcs_fix_multicast_list(struct lcs_card *card)
1110 {
1111 struct list_head failed_list;
1112 struct lcs_ipm_list *ipm, *tmp;
1113 unsigned long flags;
1114 int rc;
1115
1116 LCS_DBF_TEXT(4,trace, "fixipm");
1117 INIT_LIST_HEAD(&failed_list);
1118 spin_lock_irqsave(&card->ipm_lock, flags);
1119 list_modified:
1120 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1121 switch (ipm->ipm_state) {
1122 case LCS_IPM_STATE_SET_REQUIRED:
1123 /* del from ipm_list so noone else can tamper with
1124 * this entry */
1125 list_del_init(&ipm->list);
1126 spin_unlock_irqrestore(&card->ipm_lock, flags);
1127 rc = lcs_send_setipm(card, ipm);
1128 spin_lock_irqsave(&card->ipm_lock, flags);
1129 if (rc) {
1130 pr_info("Adding multicast address failed."
1131 " Table possibly full!\n");
1132 /* store ipm in failed list -> will be added
1133 * to ipm_list again, so a retry will be done
1134 * during the next call of this function */
1135 list_add_tail(&ipm->list, &failed_list);
1136 } else {
1137 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1138 /* re-insert into ipm_list */
1139 list_add_tail(&ipm->list, &card->ipm_list);
1140 }
1141 goto list_modified;
1142 case LCS_IPM_STATE_DEL_REQUIRED:
1143 list_del(&ipm->list);
1144 spin_unlock_irqrestore(&card->ipm_lock, flags);
1145 lcs_send_delipm(card, ipm);
1146 spin_lock_irqsave(&card->ipm_lock, flags);
1147 kfree(ipm);
1148 goto list_modified;
1149 case LCS_IPM_STATE_ON_CARD:
1150 break;
1151 }
1152 }
1153 /* re-insert all entries from the failed_list into ipm_list */
1154 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1155 list_move_tail(&ipm->list, &card->ipm_list);
1156
1157 spin_unlock_irqrestore(&card->ipm_lock, flags);
1158 }
1159
1160 /**
1161 * get mac address for the relevant Multicast address
1162 */
1163 static void
1164 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1165 {
1166 LCS_DBF_TEXT(4,trace, "getmac");
1167 if (dev->type == ARPHRD_IEEE802_TR)
1168 ip_tr_mc_map(ipm, mac);
1169 else
1170 ip_eth_mc_map(ipm, mac);
1171 }
1172
1173 /**
1174 * function called by net device to handle multicast address relevant things
1175 */
1176 static inline void
1177 lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1178 {
1179 struct ip_mc_list *im4;
1180 struct list_head *l;
1181 struct lcs_ipm_list *ipm;
1182 unsigned long flags;
1183 char buf[MAX_ADDR_LEN];
1184
1185 LCS_DBF_TEXT(4, trace, "remmclst");
1186 spin_lock_irqsave(&card->ipm_lock, flags);
1187 list_for_each(l, &card->ipm_list) {
1188 ipm = list_entry(l, struct lcs_ipm_list, list);
1189 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1190 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1191 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1192 (memcmp(buf, &ipm->ipm.mac_addr,
1193 LCS_MAC_LENGTH) == 0) )
1194 break;
1195 }
1196 if (im4 == NULL)
1197 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1198 }
1199 spin_unlock_irqrestore(&card->ipm_lock, flags);
1200 }
1201
1202 static inline struct lcs_ipm_list *
1203 lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1204 {
1205 struct lcs_ipm_list *tmp, *ipm = NULL;
1206 struct list_head *l;
1207 unsigned long flags;
1208
1209 LCS_DBF_TEXT(4, trace, "chkmcent");
1210 spin_lock_irqsave(&card->ipm_lock, flags);
1211 list_for_each(l, &card->ipm_list) {
1212 tmp = list_entry(l, struct lcs_ipm_list, list);
1213 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1214 (memcmp(buf, &tmp->ipm.mac_addr,
1215 LCS_MAC_LENGTH) == 0) ) {
1216 ipm = tmp;
1217 break;
1218 }
1219 }
1220 spin_unlock_irqrestore(&card->ipm_lock, flags);
1221 return ipm;
1222 }
1223
1224 static inline void
1225 lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1226 {
1227
1228 struct ip_mc_list *im4;
1229 struct lcs_ipm_list *ipm;
1230 char buf[MAX_ADDR_LEN];
1231 unsigned long flags;
1232
1233 LCS_DBF_TEXT(4, trace, "setmclst");
1234 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1235 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1236 ipm = lcs_check_addr_entry(card, im4, buf);
1237 if (ipm != NULL)
1238 continue; /* Address already in list. */
1239 ipm = (struct lcs_ipm_list *)
1240 kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1241 if (ipm == NULL) {
1242 pr_info("Not enough memory to add"
1243 " new multicast entry!\n");
1244 break;
1245 }
1246 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1247 ipm->ipm.ip_addr = im4->multiaddr;
1248 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1249 spin_lock_irqsave(&card->ipm_lock, flags);
1250 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1251 list_add(&ipm->list, &card->ipm_list);
1252 spin_unlock_irqrestore(&card->ipm_lock, flags);
1253 }
1254 }
1255
1256 static int
1257 lcs_register_mc_addresses(void *data)
1258 {
1259 struct lcs_card *card;
1260 struct in_device *in4_dev;
1261
1262 card = (struct lcs_card *) data;
1263
1264 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1265 return 0;
1266 LCS_DBF_TEXT(4, trace, "regmulti");
1267
1268 in4_dev = in_dev_get(card->dev);
1269 if (in4_dev == NULL)
1270 goto out;
1271 read_lock(&in4_dev->mc_list_lock);
1272 lcs_remove_mc_addresses(card,in4_dev);
1273 lcs_set_mc_addresses(card, in4_dev);
1274 read_unlock(&in4_dev->mc_list_lock);
1275 in_dev_put(in4_dev);
1276
1277 netif_carrier_off(card->dev);
1278 netif_tx_disable(card->dev);
1279 wait_event(card->write.wait_q,
1280 (card->write.state != LCS_CH_STATE_RUNNING));
1281 lcs_fix_multicast_list(card);
1282 if (card->state == DEV_STATE_UP) {
1283 netif_carrier_on(card->dev);
1284 netif_wake_queue(card->dev);
1285 }
1286 out:
1287 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1288 return 0;
1289 }
1290 #endif /* CONFIG_IP_MULTICAST */
1291
1292 /**
1293 * function called by net device to
1294 * handle multicast address relevant things
1295 */
1296 static void
1297 lcs_set_multicast_list(struct net_device *dev)
1298 {
1299 #ifdef CONFIG_IP_MULTICAST
1300 struct lcs_card *card;
1301
1302 LCS_DBF_TEXT(4, trace, "setmulti");
1303 card = (struct lcs_card *) dev->ml_priv;
1304
1305 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1306 schedule_work(&card->kernel_thread_starter);
1307 #endif /* CONFIG_IP_MULTICAST */
1308 }
1309
1310 static long
1311 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1312 {
1313 if (!IS_ERR(irb))
1314 return 0;
1315
1316 switch (PTR_ERR(irb)) {
1317 case -EIO:
1318 dev_warn(&cdev->dev,
1319 "An I/O-error occurred on the LCS device\n");
1320 LCS_DBF_TEXT(2, trace, "ckirberr");
1321 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1322 break;
1323 case -ETIMEDOUT:
1324 dev_warn(&cdev->dev,
1325 "A command timed out on the LCS device\n");
1326 LCS_DBF_TEXT(2, trace, "ckirberr");
1327 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1328 break;
1329 default:
1330 dev_warn(&cdev->dev,
1331 "An error occurred on the LCS device, rc=%ld\n",
1332 PTR_ERR(irb));
1333 LCS_DBF_TEXT(2, trace, "ckirberr");
1334 LCS_DBF_TEXT(2, trace, " rc???");
1335 }
1336 return PTR_ERR(irb);
1337 }
1338
1339 static int
1340 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1341 {
1342 int dstat, cstat;
1343 char *sense;
1344
1345 sense = (char *) irb->ecw;
1346 cstat = irb->scsw.cmd.cstat;
1347 dstat = irb->scsw.cmd.dstat;
1348
1349 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1350 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1351 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1352 LCS_DBF_TEXT(2, trace, "CGENCHK");
1353 return 1;
1354 }
1355 if (dstat & DEV_STAT_UNIT_CHECK) {
1356 if (sense[LCS_SENSE_BYTE_1] &
1357 LCS_SENSE_RESETTING_EVENT) {
1358 LCS_DBF_TEXT(2, trace, "REVIND");
1359 return 1;
1360 }
1361 if (sense[LCS_SENSE_BYTE_0] &
1362 LCS_SENSE_CMD_REJECT) {
1363 LCS_DBF_TEXT(2, trace, "CMDREJ");
1364 return 0;
1365 }
1366 if ((!sense[LCS_SENSE_BYTE_0]) &&
1367 (!sense[LCS_SENSE_BYTE_1]) &&
1368 (!sense[LCS_SENSE_BYTE_2]) &&
1369 (!sense[LCS_SENSE_BYTE_3])) {
1370 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1371 return 0;
1372 }
1373 LCS_DBF_TEXT(2, trace, "DGENCHK");
1374 return 1;
1375 }
1376 return 0;
1377 }
1378
1379 static void
1380 lcs_schedule_recovery(struct lcs_card *card)
1381 {
1382 LCS_DBF_TEXT(2, trace, "startrec");
1383 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1384 schedule_work(&card->kernel_thread_starter);
1385 }
1386
1387 /**
1388 * IRQ Handler for LCS channels
1389 */
1390 static void
1391 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1392 {
1393 struct lcs_card *card;
1394 struct lcs_channel *channel;
1395 int rc, index;
1396 int cstat, dstat;
1397
1398 if (lcs_check_irb_error(cdev, irb))
1399 return;
1400
1401 card = CARD_FROM_DEV(cdev);
1402 if (card->read.ccwdev == cdev)
1403 channel = &card->read;
1404 else
1405 channel = &card->write;
1406
1407 cstat = irb->scsw.cmd.cstat;
1408 dstat = irb->scsw.cmd.dstat;
1409 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1410 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1411 irb->scsw.cmd.dstat);
1412 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1413 irb->scsw.cmd.actl);
1414
1415 /* Check for channel and device errors presented */
1416 rc = lcs_get_problem(cdev, irb);
1417 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1418 dev_warn(&cdev->dev,
1419 "The LCS device stopped because of an error,"
1420 " dstat=0x%X, cstat=0x%X \n",
1421 dstat, cstat);
1422 if (rc) {
1423 channel->state = LCS_CH_STATE_ERROR;
1424 }
1425 }
1426 if (channel->state == LCS_CH_STATE_ERROR) {
1427 lcs_schedule_recovery(card);
1428 wake_up(&card->wait_q);
1429 return;
1430 }
1431 /* How far in the ccw chain have we processed? */
1432 if ((channel->state != LCS_CH_STATE_INIT) &&
1433 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1434 (irb->scsw.cmd.cpa != 0)) {
1435 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1436 - channel->ccws;
1437 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1438 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1439 /* Bloody io subsystem tells us lies about cpa... */
1440 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1441 while (channel->io_idx != index) {
1442 __lcs_processed_buffer(channel,
1443 channel->iob + channel->io_idx);
1444 channel->io_idx =
1445 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1446 }
1447 }
1448
1449 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1450 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1451 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1452 /* Mark channel as stopped. */
1453 channel->state = LCS_CH_STATE_STOPPED;
1454 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1455 /* CCW execution stopped on a suspend bit. */
1456 channel->state = LCS_CH_STATE_SUSPENDED;
1457 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1458 if (irb->scsw.cmd.cc != 0) {
1459 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1460 return;
1461 }
1462 /* The channel has been stopped by halt_IO. */
1463 channel->state = LCS_CH_STATE_HALTED;
1464 }
1465 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1466 channel->state = LCS_CH_STATE_CLEARED;
1467 /* Do the rest in the tasklet. */
1468 tasklet_schedule(&channel->irq_tasklet);
1469 }
1470
1471 /**
1472 * Tasklet for IRQ handler
1473 */
1474 static void
1475 lcs_tasklet(unsigned long data)
1476 {
1477 unsigned long flags;
1478 struct lcs_channel *channel;
1479 struct lcs_buffer *iob;
1480 int buf_idx;
1481 int rc;
1482
1483 channel = (struct lcs_channel *) data;
1484 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1485
1486 /* Check for processed buffers. */
1487 iob = channel->iob;
1488 buf_idx = channel->buf_idx;
1489 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1490 /* Do the callback thing. */
1491 if (iob[buf_idx].callback != NULL)
1492 iob[buf_idx].callback(channel, iob + buf_idx);
1493 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1494 }
1495 channel->buf_idx = buf_idx;
1496
1497 if (channel->state == LCS_CH_STATE_STOPPED)
1498 // FIXME: what if rc != 0 ??
1499 rc = lcs_start_channel(channel);
1500 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1501 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1502 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY) {
1503 // FIXME: what if rc != 0 ??
1504 rc = __lcs_resume_channel(channel);
1505 }
1506 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1507
1508 /* Something happened on the channel. Wake up waiters. */
1509 wake_up(&channel->wait_q);
1510 }
1511
1512 /**
1513 * Finish current tx buffer and make it ready for transmit.
1514 */
1515 static void
1516 __lcs_emit_txbuffer(struct lcs_card *card)
1517 {
1518 LCS_DBF_TEXT(5, trace, "emittx");
1519 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1520 card->tx_buffer->count += 2;
1521 lcs_ready_buffer(&card->write, card->tx_buffer);
1522 card->tx_buffer = NULL;
1523 card->tx_emitted++;
1524 }
1525
1526 /**
1527 * Callback for finished tx buffers.
1528 */
1529 static void
1530 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1531 {
1532 struct lcs_card *card;
1533
1534 LCS_DBF_TEXT(5, trace, "txbuffcb");
1535 /* Put buffer back to pool. */
1536 lcs_release_buffer(channel, buffer);
1537 card = container_of(channel, struct lcs_card, write);
1538 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1539 netif_wake_queue(card->dev);
1540 spin_lock(&card->lock);
1541 card->tx_emitted--;
1542 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1543 /*
1544 * Last running tx buffer has finished. Submit partially
1545 * filled current buffer.
1546 */
1547 __lcs_emit_txbuffer(card);
1548 spin_unlock(&card->lock);
1549 }
1550
1551 /**
1552 * Packet transmit function called by network stack
1553 */
1554 static int
1555 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1556 struct net_device *dev)
1557 {
1558 struct lcs_header *header;
1559 int rc = 0;
1560
1561 LCS_DBF_TEXT(5, trace, "hardxmit");
1562 if (skb == NULL) {
1563 card->stats.tx_dropped++;
1564 card->stats.tx_errors++;
1565 return 0;
1566 }
1567 if (card->state != DEV_STATE_UP) {
1568 dev_kfree_skb(skb);
1569 card->stats.tx_dropped++;
1570 card->stats.tx_errors++;
1571 card->stats.tx_carrier_errors++;
1572 return 0;
1573 }
1574 if (skb->protocol == htons(ETH_P_IPV6)) {
1575 dev_kfree_skb(skb);
1576 return 0;
1577 }
1578 netif_stop_queue(card->dev);
1579 spin_lock(&card->lock);
1580 if (card->tx_buffer != NULL &&
1581 card->tx_buffer->count + sizeof(struct lcs_header) +
1582 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1583 /* skb too big for current tx buffer. */
1584 __lcs_emit_txbuffer(card);
1585 if (card->tx_buffer == NULL) {
1586 /* Get new tx buffer */
1587 card->tx_buffer = lcs_get_buffer(&card->write);
1588 if (card->tx_buffer == NULL) {
1589 card->stats.tx_dropped++;
1590 rc = NETDEV_TX_BUSY;
1591 goto out;
1592 }
1593 card->tx_buffer->callback = lcs_txbuffer_cb;
1594 card->tx_buffer->count = 0;
1595 }
1596 header = (struct lcs_header *)
1597 (card->tx_buffer->data + card->tx_buffer->count);
1598 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1599 header->offset = card->tx_buffer->count;
1600 header->type = card->lan_type;
1601 header->slot = card->portno;
1602 skb_copy_from_linear_data(skb, header + 1, skb->len);
1603 spin_unlock(&card->lock);
1604 card->stats.tx_bytes += skb->len;
1605 card->stats.tx_packets++;
1606 dev_kfree_skb(skb);
1607 netif_wake_queue(card->dev);
1608 spin_lock(&card->lock);
1609 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1610 /* If this is the first tx buffer emit it immediately. */
1611 __lcs_emit_txbuffer(card);
1612 out:
1613 spin_unlock(&card->lock);
1614 return rc;
1615 }
1616
1617 static int
1618 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1619 {
1620 struct lcs_card *card;
1621 int rc;
1622
1623 LCS_DBF_TEXT(5, trace, "pktxmit");
1624 card = (struct lcs_card *) dev->ml_priv;
1625 rc = __lcs_start_xmit(card, skb, dev);
1626 return rc;
1627 }
1628
1629 /**
1630 * send startlan and lanstat command to make LCS device ready
1631 */
1632 static int
1633 lcs_startlan_auto(struct lcs_card *card)
1634 {
1635 int rc;
1636
1637 LCS_DBF_TEXT(2, trace, "strtauto");
1638 #ifdef CONFIG_NET_ETHERNET
1639 card->lan_type = LCS_FRAME_TYPE_ENET;
1640 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1641 if (rc == 0)
1642 return 0;
1643
1644 #endif
1645 #ifdef CONFIG_TR
1646 card->lan_type = LCS_FRAME_TYPE_TR;
1647 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1648 if (rc == 0)
1649 return 0;
1650 #endif
1651 #ifdef CONFIG_FDDI
1652 card->lan_type = LCS_FRAME_TYPE_FDDI;
1653 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1654 if (rc == 0)
1655 return 0;
1656 #endif
1657 return -EIO;
1658 }
1659
1660 static int
1661 lcs_startlan(struct lcs_card *card)
1662 {
1663 int rc, i;
1664
1665 LCS_DBF_TEXT(2, trace, "startlan");
1666 rc = 0;
1667 if (card->portno != LCS_INVALID_PORT_NO) {
1668 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1669 rc = lcs_startlan_auto(card);
1670 else
1671 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1672 } else {
1673 for (i = 0; i <= 16; i++) {
1674 card->portno = i;
1675 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1676 rc = lcs_send_startlan(card,
1677 LCS_INITIATOR_TCPIP);
1678 else
1679 /* autodetecting lan type */
1680 rc = lcs_startlan_auto(card);
1681 if (rc == 0)
1682 break;
1683 }
1684 }
1685 if (rc == 0)
1686 return lcs_send_lanstat(card);
1687 return rc;
1688 }
1689
1690 /**
1691 * LCS detect function
1692 * setup channels and make them I/O ready
1693 */
1694 static int
1695 lcs_detect(struct lcs_card *card)
1696 {
1697 int rc = 0;
1698
1699 LCS_DBF_TEXT(2, setup, "lcsdetct");
1700 /* start/reset card */
1701 if (card->dev)
1702 netif_stop_queue(card->dev);
1703 rc = lcs_stop_channels(card);
1704 if (rc == 0) {
1705 rc = lcs_start_channels(card);
1706 if (rc == 0) {
1707 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1708 if (rc == 0)
1709 rc = lcs_startlan(card);
1710 }
1711 }
1712 if (rc == 0) {
1713 card->state = DEV_STATE_UP;
1714 } else {
1715 card->state = DEV_STATE_DOWN;
1716 card->write.state = LCS_CH_STATE_INIT;
1717 card->read.state = LCS_CH_STATE_INIT;
1718 }
1719 return rc;
1720 }
1721
1722 /**
1723 * LCS Stop card
1724 */
1725 static int
1726 lcs_stopcard(struct lcs_card *card)
1727 {
1728 int rc;
1729
1730 LCS_DBF_TEXT(3, setup, "stopcard");
1731
1732 if (card->read.state != LCS_CH_STATE_STOPPED &&
1733 card->write.state != LCS_CH_STATE_STOPPED &&
1734 card->read.state != LCS_CH_STATE_ERROR &&
1735 card->write.state != LCS_CH_STATE_ERROR &&
1736 card->state == DEV_STATE_UP) {
1737 lcs_clear_multicast_list(card);
1738 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1739 rc = lcs_send_shutdown(card);
1740 }
1741 rc = lcs_stop_channels(card);
1742 card->state = DEV_STATE_DOWN;
1743
1744 return rc;
1745 }
1746
1747 /**
1748 * Kernel Thread helper functions for LGW initiated commands
1749 */
1750 static void
1751 lcs_start_kernel_thread(struct work_struct *work)
1752 {
1753 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1754 LCS_DBF_TEXT(5, trace, "krnthrd");
1755 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1756 kthread_run(lcs_recovery, card, "lcs_recover");
1757 #ifdef CONFIG_IP_MULTICAST
1758 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1759 kthread_run(lcs_register_mc_addresses, card, "regipm");
1760 #endif
1761 }
1762
1763 /**
1764 * Process control frames.
1765 */
1766 static void
1767 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1768 {
1769 LCS_DBF_TEXT(5, trace, "getctrl");
1770 if (cmd->initiator == LCS_INITIATOR_LGW) {
1771 switch(cmd->cmd_code) {
1772 case LCS_CMD_STARTUP:
1773 case LCS_CMD_STARTLAN:
1774 lcs_schedule_recovery(card);
1775 break;
1776 case LCS_CMD_STOPLAN:
1777 pr_warning("Stoplan for %s initiated by LGW.\n",
1778 card->dev->name);
1779 if (card->dev)
1780 netif_carrier_off(card->dev);
1781 break;
1782 default:
1783 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1784 break;
1785 }
1786 } else
1787 lcs_notify_lancmd_waiters(card, cmd);
1788 }
1789
1790 /**
1791 * Unpack network packet.
1792 */
1793 static void
1794 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1795 {
1796 struct sk_buff *skb;
1797
1798 LCS_DBF_TEXT(5, trace, "getskb");
1799 if (card->dev == NULL ||
1800 card->state != DEV_STATE_UP)
1801 /* The card isn't up. Ignore the packet. */
1802 return;
1803
1804 skb = dev_alloc_skb(skb_len);
1805 if (skb == NULL) {
1806 dev_err(&card->dev->dev,
1807 " Allocating a socket buffer to interface %s failed\n",
1808 card->dev->name);
1809 card->stats.rx_dropped++;
1810 return;
1811 }
1812 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1813 skb->protocol = card->lan_type_trans(skb, card->dev);
1814 card->stats.rx_bytes += skb_len;
1815 card->stats.rx_packets++;
1816 if (skb->protocol == htons(ETH_P_802_2))
1817 *((__u32 *)skb->cb) = ++card->pkt_seq;
1818 netif_rx(skb);
1819 }
1820
1821 /**
1822 * LCS main routine to get packets and lancmd replies from the buffers
1823 */
1824 static void
1825 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1826 {
1827 struct lcs_card *card;
1828 struct lcs_header *lcs_hdr;
1829 __u16 offset;
1830
1831 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1832 lcs_hdr = (struct lcs_header *) buffer->data;
1833 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1834 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1835 return;
1836 }
1837 card = container_of(channel, struct lcs_card, read);
1838 offset = 0;
1839 while (lcs_hdr->offset != 0) {
1840 if (lcs_hdr->offset <= 0 ||
1841 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1842 lcs_hdr->offset < offset) {
1843 /* Offset invalid. */
1844 card->stats.rx_length_errors++;
1845 card->stats.rx_errors++;
1846 return;
1847 }
1848 /* What kind of frame is it? */
1849 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1850 /* Control frame. */
1851 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1852 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1853 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1854 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1855 /* Normal network packet. */
1856 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1857 lcs_hdr->offset - offset -
1858 sizeof(struct lcs_header));
1859 else
1860 /* Unknown frame type. */
1861 ; // FIXME: error message ?
1862 /* Proceed to next frame. */
1863 offset = lcs_hdr->offset;
1864 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1865 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1866 }
1867 /* The buffer is now empty. Make it ready again. */
1868 lcs_ready_buffer(&card->read, buffer);
1869 }
1870
1871 /**
1872 * get network statistics for ifconfig and other user programs
1873 */
1874 static struct net_device_stats *
1875 lcs_getstats(struct net_device *dev)
1876 {
1877 struct lcs_card *card;
1878
1879 LCS_DBF_TEXT(4, trace, "netstats");
1880 card = (struct lcs_card *) dev->ml_priv;
1881 return &card->stats;
1882 }
1883
1884 /**
1885 * stop lcs device
1886 * This function will be called by user doing ifconfig xxx down
1887 */
1888 static int
1889 lcs_stop_device(struct net_device *dev)
1890 {
1891 struct lcs_card *card;
1892 int rc;
1893
1894 LCS_DBF_TEXT(2, trace, "stopdev");
1895 card = (struct lcs_card *) dev->ml_priv;
1896 netif_carrier_off(dev);
1897 netif_tx_disable(dev);
1898 dev->flags &= ~IFF_UP;
1899 wait_event(card->write.wait_q,
1900 (card->write.state != LCS_CH_STATE_RUNNING));
1901 rc = lcs_stopcard(card);
1902 if (rc)
1903 dev_err(&card->dev->dev,
1904 " Shutting down the LCS device failed\n ");
1905 return rc;
1906 }
1907
1908 /**
1909 * start lcs device and make it runnable
1910 * This function will be called by user doing ifconfig xxx up
1911 */
1912 static int
1913 lcs_open_device(struct net_device *dev)
1914 {
1915 struct lcs_card *card;
1916 int rc;
1917
1918 LCS_DBF_TEXT(2, trace, "opendev");
1919 card = (struct lcs_card *) dev->ml_priv;
1920 /* initialize statistics */
1921 rc = lcs_detect(card);
1922 if (rc) {
1923 pr_err("Error in opening device!\n");
1924
1925 } else {
1926 dev->flags |= IFF_UP;
1927 netif_carrier_on(dev);
1928 netif_wake_queue(dev);
1929 card->state = DEV_STATE_UP;
1930 }
1931 return rc;
1932 }
1933
1934 /**
1935 * show function for portno called by cat or similar things
1936 */
1937 static ssize_t
1938 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1939 {
1940 struct lcs_card *card;
1941
1942 card = (struct lcs_card *)dev->driver_data;
1943
1944 if (!card)
1945 return 0;
1946
1947 return sprintf(buf, "%d\n", card->portno);
1948 }
1949
1950 /**
1951 * store the value which is piped to file portno
1952 */
1953 static ssize_t
1954 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1955 {
1956 struct lcs_card *card;
1957 int value;
1958
1959 card = (struct lcs_card *)dev->driver_data;
1960
1961 if (!card)
1962 return 0;
1963
1964 sscanf(buf, "%u", &value);
1965 /* TODO: sanity checks */
1966 card->portno = value;
1967
1968 return count;
1969
1970 }
1971
1972 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1973
1974 static ssize_t
1975 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1976 {
1977 struct ccwgroup_device *cgdev;
1978
1979 cgdev = to_ccwgroupdev(dev);
1980 if (!cgdev)
1981 return -ENODEV;
1982
1983 return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
1984 }
1985
1986 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1987
1988 static ssize_t
1989 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1990 {
1991 struct lcs_card *card;
1992
1993 card = (struct lcs_card *)dev->driver_data;
1994
1995 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1996 }
1997
1998 static ssize_t
1999 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
2000 {
2001 struct lcs_card *card;
2002 int value;
2003
2004 card = (struct lcs_card *)dev->driver_data;
2005
2006 if (!card)
2007 return 0;
2008
2009 sscanf(buf, "%u", &value);
2010 /* TODO: sanity checks */
2011 card->lancmd_timeout = value;
2012
2013 return count;
2014
2015 }
2016
2017 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2018
2019 static ssize_t
2020 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2021 const char *buf, size_t count)
2022 {
2023 struct lcs_card *card = dev->driver_data;
2024 char *tmp;
2025 int i;
2026
2027 if (!card)
2028 return -EINVAL;
2029 if (card->state != DEV_STATE_UP)
2030 return -EPERM;
2031 i = simple_strtoul(buf, &tmp, 16);
2032 if (i == 1)
2033 lcs_schedule_recovery(card);
2034 return count;
2035 }
2036
2037 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2038
2039 static struct attribute * lcs_attrs[] = {
2040 &dev_attr_portno.attr,
2041 &dev_attr_type.attr,
2042 &dev_attr_lancmd_timeout.attr,
2043 &dev_attr_recover.attr,
2044 NULL,
2045 };
2046
2047 static struct attribute_group lcs_attr_group = {
2048 .attrs = lcs_attrs,
2049 };
2050
2051 /**
2052 * lcs_probe_device is called on establishing a new ccwgroup_device.
2053 */
2054 static int
2055 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2056 {
2057 struct lcs_card *card;
2058 int ret;
2059
2060 if (!get_device(&ccwgdev->dev))
2061 return -ENODEV;
2062
2063 LCS_DBF_TEXT(2, setup, "add_dev");
2064 card = lcs_alloc_card();
2065 if (!card) {
2066 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2067 put_device(&ccwgdev->dev);
2068 return -ENOMEM;
2069 }
2070 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2071 if (ret) {
2072 lcs_free_card(card);
2073 put_device(&ccwgdev->dev);
2074 return ret;
2075 }
2076 ccwgdev->dev.driver_data = card;
2077 ccwgdev->cdev[0]->handler = lcs_irq;
2078 ccwgdev->cdev[1]->handler = lcs_irq;
2079 card->gdev = ccwgdev;
2080 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2081 card->thread_start_mask = 0;
2082 card->thread_allowed_mask = 0;
2083 card->thread_running_mask = 0;
2084 return 0;
2085 }
2086
2087 static int
2088 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2089 {
2090 struct lcs_card *card;
2091
2092 LCS_DBF_TEXT(2, setup, "regnetdv");
2093 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2094 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2095 return 0;
2096 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2097 return register_netdev(card->dev);
2098 }
2099
2100 /**
2101 * lcs_new_device will be called by setting the group device online.
2102 */
2103 static const struct net_device_ops lcs_netdev_ops = {
2104 .ndo_open = lcs_open_device,
2105 .ndo_stop = lcs_stop_device,
2106 .ndo_get_stats = lcs_getstats,
2107 .ndo_start_xmit = lcs_start_xmit,
2108 };
2109
2110 static const struct net_device_ops lcs_mc_netdev_ops = {
2111 .ndo_open = lcs_open_device,
2112 .ndo_stop = lcs_stop_device,
2113 .ndo_get_stats = lcs_getstats,
2114 .ndo_start_xmit = lcs_start_xmit,
2115 .ndo_set_multicast_list = lcs_set_multicast_list,
2116 };
2117
2118 static int
2119 lcs_new_device(struct ccwgroup_device *ccwgdev)
2120 {
2121 struct lcs_card *card;
2122 struct net_device *dev=NULL;
2123 enum lcs_dev_states recover_state;
2124 int rc;
2125
2126 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2127 if (!card)
2128 return -ENODEV;
2129
2130 LCS_DBF_TEXT(2, setup, "newdev");
2131 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2132 card->read.ccwdev = ccwgdev->cdev[0];
2133 card->write.ccwdev = ccwgdev->cdev[1];
2134
2135 recover_state = card->state;
2136 ccw_device_set_online(card->read.ccwdev);
2137 ccw_device_set_online(card->write.ccwdev);
2138
2139 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2140
2141 lcs_setup_card(card);
2142 rc = lcs_detect(card);
2143 if (rc) {
2144 LCS_DBF_TEXT(2, setup, "dtctfail");
2145 dev_err(&card->dev->dev,
2146 "Detecting a network adapter for LCS devices"
2147 " failed with rc=%d (0x%x)\n", rc, rc);
2148 lcs_stopcard(card);
2149 goto out;
2150 }
2151 if (card->dev) {
2152 LCS_DBF_TEXT(2, setup, "samedev");
2153 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2154 goto netdev_out;
2155 }
2156 switch (card->lan_type) {
2157 #ifdef CONFIG_NET_ETHERNET
2158 case LCS_FRAME_TYPE_ENET:
2159 card->lan_type_trans = eth_type_trans;
2160 dev = alloc_etherdev(0);
2161 break;
2162 #endif
2163 #ifdef CONFIG_TR
2164 case LCS_FRAME_TYPE_TR:
2165 card->lan_type_trans = tr_type_trans;
2166 dev = alloc_trdev(0);
2167 break;
2168 #endif
2169 #ifdef CONFIG_FDDI
2170 case LCS_FRAME_TYPE_FDDI:
2171 card->lan_type_trans = fddi_type_trans;
2172 dev = alloc_fddidev(0);
2173 break;
2174 #endif
2175 default:
2176 LCS_DBF_TEXT(3, setup, "errinit");
2177 pr_err(" Initialization failed\n");
2178 goto out;
2179 }
2180 if (!dev)
2181 goto out;
2182 card->dev = dev;
2183 card->dev->ml_priv = card;
2184 card->dev->netdev_ops = &lcs_netdev_ops;
2185 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2186 #ifdef CONFIG_IP_MULTICAST
2187 if (!lcs_check_multicast_support(card))
2188 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2189 #endif
2190 netdev_out:
2191 lcs_set_allowed_threads(card,0xffffffff);
2192 if (recover_state == DEV_STATE_RECOVER) {
2193 lcs_set_multicast_list(card->dev);
2194 card->dev->flags |= IFF_UP;
2195 netif_carrier_on(card->dev);
2196 netif_wake_queue(card->dev);
2197 card->state = DEV_STATE_UP;
2198 } else {
2199 lcs_stopcard(card);
2200 }
2201
2202 if (lcs_register_netdev(ccwgdev) != 0)
2203 goto out;
2204
2205 /* Print out supported assists: IPv6 */
2206 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2207 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2208 "with" : "without");
2209 /* Print out supported assist: Multicast */
2210 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2211 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2212 "with" : "without");
2213 return 0;
2214 out:
2215
2216 ccw_device_set_offline(card->read.ccwdev);
2217 ccw_device_set_offline(card->write.ccwdev);
2218 return -ENODEV;
2219 }
2220
2221 /**
2222 * lcs_shutdown_device, called when setting the group device offline.
2223 */
2224 static int
2225 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2226 {
2227 struct lcs_card *card;
2228 enum lcs_dev_states recover_state;
2229 int ret;
2230
2231 LCS_DBF_TEXT(3, setup, "shtdndev");
2232 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2233 if (!card)
2234 return -ENODEV;
2235 if (recovery_mode == 0) {
2236 lcs_set_allowed_threads(card, 0);
2237 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2238 return -ERESTARTSYS;
2239 }
2240 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2241 recover_state = card->state;
2242
2243 ret = lcs_stop_device(card->dev);
2244 ret = ccw_device_set_offline(card->read.ccwdev);
2245 ret = ccw_device_set_offline(card->write.ccwdev);
2246 if (recover_state == DEV_STATE_UP) {
2247 card->state = DEV_STATE_RECOVER;
2248 }
2249 if (ret)
2250 return ret;
2251 return 0;
2252 }
2253
2254 static int
2255 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2256 {
2257 return __lcs_shutdown_device(ccwgdev, 0);
2258 }
2259
2260 /**
2261 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2262 */
2263 static int
2264 lcs_recovery(void *ptr)
2265 {
2266 struct lcs_card *card;
2267 struct ccwgroup_device *gdev;
2268 int rc;
2269
2270 card = (struct lcs_card *) ptr;
2271
2272 LCS_DBF_TEXT(4, trace, "recover1");
2273 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2274 return 0;
2275 LCS_DBF_TEXT(4, trace, "recover2");
2276 gdev = card->gdev;
2277 dev_warn(&gdev->dev,
2278 "A recovery process has been started for the LCS device\n");
2279 rc = __lcs_shutdown_device(gdev, 1);
2280 rc = lcs_new_device(gdev);
2281 if (!rc)
2282 pr_info("Device %s successfully recovered!\n",
2283 card->dev->name);
2284 else
2285 pr_info("Device %s could not be recovered!\n",
2286 card->dev->name);
2287 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2288 return 0;
2289 }
2290
2291 /**
2292 * lcs_remove_device, free buffers and card
2293 */
2294 static void
2295 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2296 {
2297 struct lcs_card *card;
2298
2299 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2300 if (!card)
2301 return;
2302
2303 LCS_DBF_TEXT(3, setup, "remdev");
2304 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2305 if (ccwgdev->state == CCWGROUP_ONLINE) {
2306 lcs_shutdown_device(ccwgdev);
2307 }
2308 if (card->dev)
2309 unregister_netdev(card->dev);
2310 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2311 lcs_cleanup_card(card);
2312 lcs_free_card(card);
2313 put_device(&ccwgdev->dev);
2314 }
2315
2316 /**
2317 * LCS ccwgroup driver registration
2318 */
2319 static struct ccwgroup_driver lcs_group_driver = {
2320 .owner = THIS_MODULE,
2321 .name = "lcs",
2322 .max_slaves = 2,
2323 .driver_id = 0xD3C3E2,
2324 .probe = lcs_probe_device,
2325 .remove = lcs_remove_device,
2326 .set_online = lcs_new_device,
2327 .set_offline = lcs_shutdown_device,
2328 };
2329
2330 /**
2331 * LCS Module/Kernel initialization function
2332 */
2333 static int
2334 __init lcs_init_module(void)
2335 {
2336 int rc;
2337
2338 pr_info("Loading %s\n", version);
2339 rc = lcs_register_debug_facility();
2340 LCS_DBF_TEXT(0, setup, "lcsinit");
2341 if (rc) {
2342 pr_err("Initialization failed\n");
2343 return rc;
2344 }
2345
2346 rc = register_cu3088_discipline(&lcs_group_driver);
2347 if (rc) {
2348 pr_err("Initialization failed\n");
2349 return rc;
2350 }
2351 return 0;
2352 }
2353
2354
2355 /**
2356 * LCS module cleanup function
2357 */
2358 static void
2359 __exit lcs_cleanup_module(void)
2360 {
2361 pr_info("Terminating lcs module.\n");
2362 LCS_DBF_TEXT(0, trace, "cleanup");
2363 unregister_cu3088_discipline(&lcs_group_driver);
2364 lcs_unregister_debug_facility();
2365 }
2366
2367 module_init(lcs_init_module);
2368 module_exit(lcs_cleanup_module);
2369
2370 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2371 MODULE_LICENSE("GPL");
2372
Linux for Ginger Game Console