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[PATCH] kfree cleanup: drivers/s390
[deliverable/linux.git] / drivers / s390 / net / lcs.c
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1da177e4
LT		 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 (pavlic@de.ibm.com) and
12 * Martin Schwidefsky <schwidefsky@de.ibm.com>
13 *
66a464db 14 * $Revision: 1.99 $ $Date: 2005/05/11 08:10:17 $
1da177e4
LT		 15 *
16 * This program is free software; you can redistribute it and/or modify
17 * it under the terms of the GNU General Public License as published by
18 * the Free Software Foundation; either version 2, or (at your option)
19 * any later version.
20 *
21 * This program is distributed in the hope that it will be useful,
22 * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24 * GNU General Public License for more details.
25 *
26 * You should have received a copy of the GNU General Public License
27 * along with this program; if not, write to the Free Software
28 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
29 */
30
31#include <linux/module.h>
32#include <linux/if.h>
33#include <linux/netdevice.h>
34#include <linux/etherdevice.h>
35#include <linux/trdevice.h>
36#include <linux/fddidevice.h>
37#include <linux/inetdevice.h>
38#include <linux/in.h>
39#include <linux/igmp.h>
40#include <linux/delay.h>
41#include <net/arp.h>
42#include <net/ip.h>
43
44#include <asm/debug.h>
45#include <asm/idals.h>
46#include <asm/timex.h>
47#include <linux/device.h>
48#include <asm/ccwgroup.h>
49
50#include "lcs.h"
51#include "cu3088.h"
52
53
54#if !defined(CONFIG_NET_ETHERNET) && \
55 !defined(CONFIG_TR) && !defined(CONFIG_FDDI)
56#error Cannot compile lcs.c without some net devices switched on.
57#endif
58
59/**
60 * initialization string for output
61 */
66a464db 62#define VERSION_LCS_C "$Revision: 1.99 $"
1da177e4
LT		 63
64static char version[] __initdata = "LCS driver ("VERSION_LCS_C "/" VERSION_LCS_H ")";
65static char debug_buffer[255];
66
67/**
68 * Some prototypes.
69 */
70static void lcs_tasklet(unsigned long);
71static void lcs_start_kernel_thread(struct lcs_card *card);
72static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
73static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
74
75/**
76 * Debug Facility Stuff
77 */
78static debug_info_t *lcs_dbf_setup;
79static debug_info_t *lcs_dbf_trace;
80
81/**
82 * LCS Debug Facility functions
83 */
84static void
85lcs_unregister_debug_facility(void)
86{
87 if (lcs_dbf_setup)
88 debug_unregister(lcs_dbf_setup);
89 if (lcs_dbf_trace)
90 debug_unregister(lcs_dbf_trace);
91}
92
93static int
94lcs_register_debug_facility(void)
95{
66a464db
MH		 96 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
97 lcs_dbf_trace = debug_register("lcs_trace", 2, 2, 8);
1da177e4
LT		 98 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
99 PRINT_ERR("Not enough memory for debug facility.\n");
100 lcs_unregister_debug_facility();
101 return -ENOMEM;
102 }
103 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
104 debug_set_level(lcs_dbf_setup, 4);
105 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
106 debug_set_level(lcs_dbf_trace, 4);
107 return 0;
108}
109
110/**
111 * Allocate io buffers.
112 */
113static int
114lcs_alloc_channel(struct lcs_channel *channel)
115{
116 int cnt;
117
118 LCS_DBF_TEXT(2, setup, "ichalloc");
119 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
120 /* alloc memory fo iobuffer */
121 channel->iob[cnt].data = (void *)
122 kmalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
123 if (channel->iob[cnt].data == NULL)
124 break;
125 memset(channel->iob[cnt].data, 0, LCS_IOBUFFERSIZE);
126 channel->iob[cnt].state = BUF_STATE_EMPTY;
127 }
128 if (cnt < LCS_NUM_BUFFS) {
129 /* Not all io buffers could be allocated. */
130 LCS_DBF_TEXT(2, setup, "echalloc");
131 while (cnt-- > 0)
132 kfree(channel->iob[cnt].data);
133 return -ENOMEM;
134 }
135 return 0;
136}
137
138/**
139 * Free io buffers.
140 */
141static void
142lcs_free_channel(struct lcs_channel *channel)
143{
144 int cnt;
145
146 LCS_DBF_TEXT(2, setup, "ichfree");
147 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
17fd682e 148 kfree(channel->iob[cnt].data);
1da177e4
LT		 149 channel->iob[cnt].data = NULL;
150 }
151}
152
153/*
154 * Cleanup channel.
155 */
156static void
157lcs_cleanup_channel(struct lcs_channel *channel)
158{
159 LCS_DBF_TEXT(3, setup, "cleanch");
160 /* Kill write channel tasklets. */
161 tasklet_kill(&channel->irq_tasklet);
162 /* Free channel buffers. */
163 lcs_free_channel(channel);
164}
165
166/**
167 * LCS free memory for card and channels.
168 */
169static void
170lcs_free_card(struct lcs_card *card)
171{
172 LCS_DBF_TEXT(2, setup, "remcard");
173 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
174 kfree(card);
175}
176
177/**
178 * LCS alloc memory for card and channels
179 */
180static struct lcs_card *
181lcs_alloc_card(void)
182{
183 struct lcs_card *card;
184 int rc;
185
186 LCS_DBF_TEXT(2, setup, "alloclcs");
187
188 card = kmalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
189 if (card == NULL)
190 return NULL;
191 memset(card, 0, sizeof(struct lcs_card));
192 card->lan_type = LCS_FRAME_TYPE_AUTO;
193 card->pkt_seq = 0;
194 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
195 /* Allocate io buffers for the read channel. */
196 rc = lcs_alloc_channel(&card->read);
197 if (rc){
198 LCS_DBF_TEXT(2, setup, "iccwerr");
199 lcs_free_card(card);
200 return NULL;
201 }
202 /* Allocate io buffers for the write channel. */
203 rc = lcs_alloc_channel(&card->write);
204 if (rc) {
205 LCS_DBF_TEXT(2, setup, "iccwerr");
206 lcs_cleanup_channel(&card->read);
207 lcs_free_card(card);
208 return NULL;
209 }
210
211#ifdef CONFIG_IP_MULTICAST
212 INIT_LIST_HEAD(&card->ipm_list);
213#endif
214 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
215 return card;
216}
217
218/*
219 * Setup read channel.
220 */
221static void
222lcs_setup_read_ccws(struct lcs_card *card)
223{
224 int cnt;
225
226 LCS_DBF_TEXT(2, setup, "ireadccw");
227 /* Setup read ccws. */
228 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
229 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
230 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
231 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
232 card->read.ccws[cnt].flags =
233 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
234 /*
235 * Note: we have allocated the buffer with GFP_DMA, so
236 * we do not need to do set_normalized_cda.
237 */
238 card->read.ccws[cnt].cda =
239 (__u32) __pa(card->read.iob[cnt].data);
240 ((struct lcs_header *)
241 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
242 card->read.iob[cnt].callback = lcs_get_frames_cb;
243 card->read.iob[cnt].state = BUF_STATE_READY;
244 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
245 }
246 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
247 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
248 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
249 /* Last ccw is a tic (transfer in channel). */
250 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
251 card->read.ccws[LCS_NUM_BUFFS].cda =
252 (__u32) __pa(card->read.ccws);
253 /* Setg initial state of the read channel. */
254 card->read.state = CH_STATE_INIT;
255
256 card->read.io_idx = 0;
257 card->read.buf_idx = 0;
258}
259
260static void
261lcs_setup_read(struct lcs_card *card)
262{
263 LCS_DBF_TEXT(3, setup, "initread");
264
265 lcs_setup_read_ccws(card);
266 /* Initialize read channel tasklet. */
267 card->read.irq_tasklet.data = (unsigned long) &card->read;
268 card->read.irq_tasklet.func = lcs_tasklet;
269 /* Initialize waitqueue. */
270 init_waitqueue_head(&card->read.wait_q);
271}
272
273/*
274 * Setup write channel.
275 */
276static void
277lcs_setup_write_ccws(struct lcs_card *card)
278{
279 int cnt;
280
281 LCS_DBF_TEXT(3, setup, "iwritccw");
282 /* Setup write ccws. */
283 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
284 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
285 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
286 card->write.ccws[cnt].count = 0;
287 card->write.ccws[cnt].flags =
288 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
289 /*
290 * Note: we have allocated the buffer with GFP_DMA, so
291 * we do not need to do set_normalized_cda.
292 */
293 card->write.ccws[cnt].cda =
294 (__u32) __pa(card->write.iob[cnt].data);
295 }
296 /* Last ccw is a tic (transfer in channel). */
297 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
298 card->write.ccws[LCS_NUM_BUFFS].cda =
299 (__u32) __pa(card->write.ccws);
300 /* Set initial state of the write channel. */
301 card->read.state = CH_STATE_INIT;
302
303 card->write.io_idx = 0;
304 card->write.buf_idx = 0;
305}
306
307static void
308lcs_setup_write(struct lcs_card *card)
309{
310 LCS_DBF_TEXT(3, setup, "initwrit");
311
312 lcs_setup_write_ccws(card);
313 /* Initialize write channel tasklet. */
314 card->write.irq_tasklet.data = (unsigned long) &card->write;
315 card->write.irq_tasklet.func = lcs_tasklet;
316 /* Initialize waitqueue. */
317 init_waitqueue_head(&card->write.wait_q);
318}
319
320static void
321lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
322{
323 unsigned long flags;
324
325 spin_lock_irqsave(&card->mask_lock, flags);
326 card->thread_allowed_mask = threads;
327 spin_unlock_irqrestore(&card->mask_lock, flags);
328 wake_up(&card->wait_q);
329}
330static inline int
331lcs_threads_running(struct lcs_card *card, unsigned long threads)
332{
333 unsigned long flags;
334 int rc = 0;
335
336 spin_lock_irqsave(&card->mask_lock, flags);
337 rc = (card->thread_running_mask & threads);
338 spin_unlock_irqrestore(&card->mask_lock, flags);
339 return rc;
340}
341
342static int
343lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
344{
345 return wait_event_interruptible(card->wait_q,
346 lcs_threads_running(card, threads) == 0);
347}
348
349static inline int
350lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
351{
352 unsigned long flags;
353
354 spin_lock_irqsave(&card->mask_lock, flags);
355 if ( !(card->thread_allowed_mask & thread) ||
356 (card->thread_start_mask & thread) ) {
357 spin_unlock_irqrestore(&card->mask_lock, flags);
358 return -EPERM;
359 }
360 card->thread_start_mask |= thread;
361 spin_unlock_irqrestore(&card->mask_lock, flags);
362 return 0;
363}
364
365static void
366lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
367{
368 unsigned long flags;
369
370 spin_lock_irqsave(&card->mask_lock, flags);
371 card->thread_running_mask &= ~thread;
372 spin_unlock_irqrestore(&card->mask_lock, flags);
373 wake_up(&card->wait_q);
374}
375
376static inline int
377__lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
378{
379 unsigned long flags;
380 int rc = 0;
381
382 spin_lock_irqsave(&card->mask_lock, flags);
383 if (card->thread_start_mask & thread){
384 if ((card->thread_allowed_mask & thread) &&
385 !(card->thread_running_mask & thread)){
386 rc = 1;
387 card->thread_start_mask &= ~thread;
388 card->thread_running_mask |= thread;
389 } else
390 rc = -EPERM;
391 }
392 spin_unlock_irqrestore(&card->mask_lock, flags);
393 return rc;
394}
395
396static int
397lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
398{
399 int rc = 0;
400 wait_event(card->wait_q,
401 (rc = __lcs_do_run_thread(card, thread)) >= 0);
402 return rc;
403}
404
405static int
406lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
407{
408 unsigned long flags;
409 int rc = 0;
410
411 spin_lock_irqsave(&card->mask_lock, flags);
412 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
413 (u8) card->thread_start_mask,
414 (u8) card->thread_allowed_mask,
415 (u8) card->thread_running_mask);
416 rc = (card->thread_start_mask & thread);
417 spin_unlock_irqrestore(&card->mask_lock, flags);
418 return rc;
419}
420
421/**
422 * Initialize channels,card and state machines.
423 */
424static void
425lcs_setup_card(struct lcs_card *card)
426{
427 LCS_DBF_TEXT(2, setup, "initcard");
428 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
429
430 lcs_setup_read(card);
431 lcs_setup_write(card);
432 /* Set cards initial state. */
433 card->state = DEV_STATE_DOWN;
434 card->tx_buffer = NULL;
435 card->tx_emitted = 0;
436
437 /* Initialize kernel thread task used for LGW commands. */
438 INIT_WORK(&card->kernel_thread_starter,
439 (void *)lcs_start_kernel_thread,card);
440 card->thread_start_mask = 0;
441 card->thread_allowed_mask = 0;
442 card->thread_running_mask = 0;
443 init_waitqueue_head(&card->wait_q);
444 spin_lock_init(&card->lock);
445 spin_lock_init(&card->ipm_lock);
446 spin_lock_init(&card->mask_lock);
447#ifdef CONFIG_IP_MULTICAST
448 INIT_LIST_HEAD(&card->ipm_list);
449#endif
450 INIT_LIST_HEAD(&card->lancmd_waiters);
451}
452
453static inline void
454lcs_clear_multicast_list(struct lcs_card *card)
455{
456#ifdef CONFIG_IP_MULTICAST
457 struct lcs_ipm_list *ipm;
458 unsigned long flags;
459
460 /* Free multicast list. */
461 LCS_DBF_TEXT(3, setup, "clmclist");
462 spin_lock_irqsave(&card->ipm_lock, flags);
463 while (!list_empty(&card->ipm_list)){
464 ipm = list_entry(card->ipm_list.next,
465 struct lcs_ipm_list, list);
466 list_del(&ipm->list);
467 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
468 spin_unlock_irqrestore(&card->ipm_lock, flags);
469 lcs_send_delipm(card, ipm);
470 spin_lock_irqsave(&card->ipm_lock, flags);
471 }
472 kfree(ipm);
473 }
474 spin_unlock_irqrestore(&card->ipm_lock, flags);
475#endif
476}
477/**
478 * Cleanup channels,card and state machines.
479 */
480static void
481lcs_cleanup_card(struct lcs_card *card)
482{
483
484 LCS_DBF_TEXT(3, setup, "cleancrd");
485 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
486
487 if (card->dev != NULL)
488 free_netdev(card->dev);
489 /* Cleanup channels. */
490 lcs_cleanup_channel(&card->write);
491 lcs_cleanup_channel(&card->read);
492}
493
494/**
495 * Start channel.
496 */
497static int
498lcs_start_channel(struct lcs_channel *channel)
499{
500 unsigned long flags;
501 int rc;
502
503 LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
504 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
505 rc = ccw_device_start(channel->ccwdev,
506 channel->ccws + channel->io_idx, 0, 0,
507 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
508 if (rc == 0)
509 channel->state = CH_STATE_RUNNING;
510 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
511 if (rc) {
512 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
513 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
514 }
515 return rc;
516}
517
518static int
519lcs_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", channel->ccwdev->dev.bus_id);
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", channel->ccwdev->dev.bus_id);
531 return rc;
532 }
533 wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
534 channel->state = CH_STATE_STOPPED;
535 return rc;
536}
537
538
539/**
540 * Stop channel.
541 */
542static int
543lcs_stop_channel(struct lcs_channel *channel)
544{
545 unsigned long flags;
546 int rc;
547
548 if (channel->state == CH_STATE_STOPPED)
549 return 0;
550 LCS_DBF_TEXT(4,trace,"haltsch");
551 LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
552 channel->state = 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", channel->ccwdev->dev.bus_id);
558 return rc;
559 }
560 /* Asynchronous halt initialted. Wait for its completion. */
561 wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
562 lcs_clear_channel(channel);
563 return 0;
564}
565
566/**
567 * start read and write channel
568 */
569static int
570lcs_start_channels(struct lcs_card *card)
571{
572 int rc;
573
574 LCS_DBF_TEXT(2, trace, "chstart");
575 /* start read channel */
576 rc = lcs_start_channel(&card->read);
577 if (rc)
578 return rc;
579 /* start write channel */
580 rc = lcs_start_channel(&card->write);
581 if (rc)
582 lcs_stop_channel(&card->read);
583 return rc;
584}
585
586/**
587 * stop read and write channel
588 */
589static int
590lcs_stop_channels(struct lcs_card *card)
591{
592 LCS_DBF_TEXT(2, trace, "chhalt");
593 lcs_stop_channel(&card->read);
594 lcs_stop_channel(&card->write);
595 return 0;
596}
597
598/**
599 * Get empty buffer.
600 */
601static struct lcs_buffer *
602__lcs_get_buffer(struct lcs_channel *channel)
603{
604 int index;
605
606 LCS_DBF_TEXT(5, trace, "_getbuff");
607 index = channel->io_idx;
608 do {
609 if (channel->iob[index].state == BUF_STATE_EMPTY) {
610 channel->iob[index].state = BUF_STATE_LOCKED;
611 return channel->iob + index;
612 }
613 index = (index + 1) & (LCS_NUM_BUFFS - 1);
614 } while (index != channel->io_idx);
615 return NULL;
616}
617
618static struct lcs_buffer *
619lcs_get_buffer(struct lcs_channel *channel)
620{
621 struct lcs_buffer *buffer;
622 unsigned long flags;
623
624 LCS_DBF_TEXT(5, trace, "getbuff");
625 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
626 buffer = __lcs_get_buffer(channel);
627 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
628 return buffer;
629}
630
631/**
632 * Resume channel program if the channel is suspended.
633 */
634static int
635__lcs_resume_channel(struct lcs_channel *channel)
636{
637 int rc;
638
639 if (channel->state != CH_STATE_SUSPENDED)
640 return 0;
641 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
642 return 0;
643 LCS_DBF_TEXT_(5, trace, "rsch%s", channel->ccwdev->dev.bus_id);
644 rc = ccw_device_resume(channel->ccwdev);
645 if (rc) {
646 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
647 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
648 } else
649 channel->state = CH_STATE_RUNNING;
650 return rc;
651
652}
653
654/**
655 * Make a buffer ready for processing.
656 */
657static inline void
658__lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
659{
660 int prev, next;
661
662 LCS_DBF_TEXT(5, trace, "rdybits");
663 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
664 next = (index + 1) & (LCS_NUM_BUFFS - 1);
665 /* Check if we may clear the suspend bit of this buffer. */
666 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
667 /* Check if we have to set the PCI bit. */
668 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
669 /* Suspend bit of the previous buffer is not set. */
670 channel->ccws[index].flags |= CCW_FLAG_PCI;
671 /* Suspend bit of the next buffer is set. */
672 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
673 }
674}
675
676static int
677lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
678{
679 unsigned long flags;
680 int index, rc;
681
682 LCS_DBF_TEXT(5, trace, "rdybuff");
683 if (buffer->state != BUF_STATE_LOCKED &&
684 buffer->state != BUF_STATE_PROCESSED)
685 BUG();
686 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
687 buffer->state = BUF_STATE_READY;
688 index = buffer - channel->iob;
689 /* Set length. */
690 channel->ccws[index].count = buffer->count;
691 /* Check relevant PCI/suspend bits. */
692 __lcs_ready_buffer_bits(channel, index);
693 rc = __lcs_resume_channel(channel);
694 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
695 return rc;
696}
697
698/**
699 * Mark the buffer as processed. Take care of the suspend bit
700 * of the previous buffer. This function is called from
701 * interrupt context, so the lock must not be taken.
702 */
703static int
704__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
705{
706 int index, prev, next;
707
708 LCS_DBF_TEXT(5, trace, "prcsbuff");
709 if (buffer->state != BUF_STATE_READY)
710 BUG();
711 buffer->state = BUF_STATE_PROCESSED;
712 index = buffer - channel->iob;
713 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
714 next = (index + 1) & (LCS_NUM_BUFFS - 1);
715 /* Set the suspend bit and clear the PCI bit of this buffer. */
716 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
717 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
718 /* Check the suspend bit of the previous buffer. */
719 if (channel->iob[prev].state == BUF_STATE_READY) {
720 /*
721 * Previous buffer is in state ready. It might have
722 * happened in lcs_ready_buffer that the suspend bit
723 * has not been cleared to avoid an endless loop.
724 * Do it now.
725 */
726 __lcs_ready_buffer_bits(channel, prev);
727 }
728 /* Clear PCI bit of next buffer. */
729 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
730 return __lcs_resume_channel(channel);
731}
732
733/**
734 * Put a processed buffer back to state empty.
735 */
736static void
737lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
738{
739 unsigned long flags;
740
741 LCS_DBF_TEXT(5, trace, "relbuff");
742 if (buffer->state != BUF_STATE_LOCKED &&
743 buffer->state != BUF_STATE_PROCESSED)
744 BUG();
745 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
746 buffer->state = BUF_STATE_EMPTY;
747 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
748}
749
750/**
751 * Get buffer for a lan command.
752 */
753static struct lcs_buffer *
754lcs_get_lancmd(struct lcs_card *card, int count)
755{
756 struct lcs_buffer *buffer;
757 struct lcs_cmd *cmd;
758
759 LCS_DBF_TEXT(4, trace, "getlncmd");
760 /* Get buffer and wait if none is available. */
761 wait_event(card->write.wait_q,
762 ((buffer = lcs_get_buffer(&card->write)) != NULL));
763 count += sizeof(struct lcs_header);
764 *(__u16 *)(buffer->data + count) = 0;
765 buffer->count = count + sizeof(__u16);
766 buffer->callback = lcs_release_buffer;
767 cmd = (struct lcs_cmd *) buffer->data;
768 cmd->offset = count;
769 cmd->type = LCS_FRAME_TYPE_CONTROL;
770 cmd->slot = 0;
771 return buffer;
772}
773
774
775static void
776lcs_get_reply(struct lcs_reply *reply)
777{
778 WARN_ON(atomic_read(&reply->refcnt) <= 0);
779 atomic_inc(&reply->refcnt);
780}
781
782static void
783lcs_put_reply(struct lcs_reply *reply)
784{
785 WARN_ON(atomic_read(&reply->refcnt) <= 0);
786 if (atomic_dec_and_test(&reply->refcnt)) {
787 kfree(reply);
788 }
789
790}
791
792static struct lcs_reply *
793lcs_alloc_reply(struct lcs_cmd *cmd)
794{
795 struct lcs_reply *reply;
796
797 LCS_DBF_TEXT(4, trace, "getreply");
798
799 reply = kmalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
800 if (!reply)
801 return NULL;
802 memset(reply,0,sizeof(struct lcs_reply));
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 */
815static void
816lcs_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 */
843void
844lcs_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
868static int
869lcs_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 */
911static int
912lcs_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 */
929static int
930lcs_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 */
946static 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
953static int
954lcs_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 */
973static int
974lcs_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 */
992static 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
1000static int
1001lcs_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 */
1020static int
1021lcs_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 */
1044static int
1045lcs_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 */
1068static 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
1078static int
1079lcs_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 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1098 return -EOPNOTSUPP;
1099 }
1da177e4
LT		 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 */
1108static void
1109lcs_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);
1119list_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 PRINT_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 */
109a260b 1154 list_for_each_entry_safe(ipm, tmp, &failed_list, list) {
1da177e4
LT		 1155 list_del_init(&ipm->list);
1156 list_add_tail(&ipm->list, &card->ipm_list);
1157 }
1158 spin_unlock_irqrestore(&card->ipm_lock, flags);
1159 if (card->state == DEV_STATE_UP)
1160 netif_wake_queue(card->dev);
1161}
1162
1163/**
1164 * get mac address for the relevant Multicast address
1165 */
1166static void
1167lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
1168{
1169 LCS_DBF_TEXT(4,trace, "getmac");
1170 if (dev->type == ARPHRD_IEEE802_TR)
1171 ip_tr_mc_map(ipm, mac);
1172 else
1173 ip_eth_mc_map(ipm, mac);
1174}
1175
1176/**
1177 * function called by net device to handle multicast address relevant things
1178 */
1179static inline void
1180lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1181{
1182 struct ip_mc_list *im4;
1183 struct list_head *l;
1184 struct lcs_ipm_list *ipm;
1185 unsigned long flags;
1186 char buf[MAX_ADDR_LEN];
1187
1188 LCS_DBF_TEXT(4, trace, "remmclst");
1189 spin_lock_irqsave(&card->ipm_lock, flags);
1190 list_for_each(l, &card->ipm_list) {
1191 ipm = list_entry(l, struct lcs_ipm_list, list);
1192 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1193 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1194 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1195 (memcmp(buf, &ipm->ipm.mac_addr,
1196 LCS_MAC_LENGTH) == 0) )
1197 break;
1198 }
1199 if (im4 == NULL)
1200 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1201 }
1202 spin_unlock_irqrestore(&card->ipm_lock, flags);
1203}
1204
1205static inline struct lcs_ipm_list *
1206lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1207{
1208 struct lcs_ipm_list *tmp, *ipm = NULL;
1209 struct list_head *l;
1210 unsigned long flags;
1211
1212 LCS_DBF_TEXT(4, trace, "chkmcent");
1213 spin_lock_irqsave(&card->ipm_lock, flags);
1214 list_for_each(l, &card->ipm_list) {
1215 tmp = list_entry(l, struct lcs_ipm_list, list);
1216 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1217 (memcmp(buf, &tmp->ipm.mac_addr,
1218 LCS_MAC_LENGTH) == 0) ) {
1219 ipm = tmp;
1220 break;
1221 }
1222 }
1223 spin_unlock_irqrestore(&card->ipm_lock, flags);
1224 return ipm;
1225}
1226
1227static inline void
1228lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1229{
1230
1231 struct ip_mc_list *im4;
1232 struct lcs_ipm_list *ipm;
1233 char buf[MAX_ADDR_LEN];
1234 unsigned long flags;
1235
1236 LCS_DBF_TEXT(4, trace, "setmclst");
1237 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1238 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1239 ipm = lcs_check_addr_entry(card, im4, buf);
1240 if (ipm != NULL)
1241 continue; /* Address already in list. */
1242 ipm = (struct lcs_ipm_list *)
1243 kmalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1244 if (ipm == NULL) {
1245 PRINT_INFO("Not enough memory to add "
1246 "new multicast entry!\n");
1247 break;
1248 }
1249 memset(ipm, 0, sizeof(struct lcs_ipm_list));
1250 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1251 ipm->ipm.ip_addr = im4->multiaddr;
1252 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1253 spin_lock_irqsave(&card->ipm_lock, flags);
1254 list_add(&ipm->list, &card->ipm_list);
1255 spin_unlock_irqrestore(&card->ipm_lock, flags);
1256 }
1257}
1258
1259static int
1260lcs_register_mc_addresses(void *data)
1261{
1262 struct lcs_card *card;
1263 struct in_device *in4_dev;
1264
1265 card = (struct lcs_card *) data;
1266 daemonize("regipm");
1267
1268 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1269 return 0;
1270 LCS_DBF_TEXT(4, trace, "regmulti");
1271
1272 in4_dev = in_dev_get(card->dev);
1273 if (in4_dev == NULL)
1274 goto out;
1275 read_lock(&in4_dev->mc_list_lock);
1276 lcs_remove_mc_addresses(card,in4_dev);
1277 lcs_set_mc_addresses(card, in4_dev);
1278 read_unlock(&in4_dev->mc_list_lock);
1279 in_dev_put(in4_dev);
1280
1281 lcs_fix_multicast_list(card);
1282out:
1283 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1284 return 0;
1285}
1286/**
1287 * function called by net device to
1288 * handle multicast address relevant things
1289 */
1290static void
1291lcs_set_multicast_list(struct net_device *dev)
1292{
1293 struct lcs_card *card;
1294
1295 LCS_DBF_TEXT(4, trace, "setmulti");
1296 card = (struct lcs_card *) dev->priv;
1297
1298 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) {
1299 schedule_work(&card->kernel_thread_starter);
1300 }
1301}
1302
1303#endif /* CONFIG_IP_MULTICAST */
1304
1305static long
1306lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1307{
1308 if (!IS_ERR(irb))
1309 return 0;
1310
1311 switch (PTR_ERR(irb)) {
1312 case -EIO:
1313 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1314 LCS_DBF_TEXT(2, trace, "ckirberr");
1315 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1316 break;
1317 case -ETIMEDOUT:
1318 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1319 LCS_DBF_TEXT(2, trace, "ckirberr");
1320 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1321 break;
1322 default:
1323 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1324 cdev->dev.bus_id);
1325 LCS_DBF_TEXT(2, trace, "ckirberr");
1326 LCS_DBF_TEXT(2, trace, " rc???");
1327 }
1328 return PTR_ERR(irb);
1329}
1330
1331
1332/**
1333 * IRQ Handler for LCS channels
1334 */
1335static void
1336lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1337{
1338 struct lcs_card *card;
1339 struct lcs_channel *channel;
1340 int index;
1341
1342 if (lcs_check_irb_error(cdev, irb))
1343 return;
1344
1345 card = CARD_FROM_DEV(cdev);
1346 if (card->read.ccwdev == cdev)
1347 channel = &card->read;
1348 else
1349 channel = &card->write;
1350
1351 LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1352 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1353 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1354
1355 /* How far in the ccw chain have we processed? */
1356 if ((channel->state != CH_STATE_INIT) &&
1357 (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1358 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1359 - channel->ccws;
1360 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1361 (irb->scsw.cstat | SCHN_STAT_PCI))
1362 /* Bloody io subsystem tells us lies about cpa... */
1363 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1364 while (channel->io_idx != index) {
1365 __lcs_processed_buffer(channel,
1366 channel->iob + channel->io_idx);
1367 channel->io_idx =
1368 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1369 }
1370 }
1371
1372 if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1373 (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1374 (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1375 /* Mark channel as stopped. */
1376 channel->state = CH_STATE_STOPPED;
1377 else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1378 /* CCW execution stopped on a suspend bit. */
1379 channel->state = CH_STATE_SUSPENDED;
1380
1381 if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1382 if (irb->scsw.cc != 0) {
1383 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1384 return;
1385 }
1386 /* The channel has been stopped by halt_IO. */
1387 channel->state = CH_STATE_HALTED;
1388 }
1389
1390 if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1391 channel->state = CH_STATE_CLEARED;
1392 }
1393 /* Do the rest in the tasklet. */
1394 tasklet_schedule(&channel->irq_tasklet);
1395}
1396
1397/**
1398 * Tasklet for IRQ handler
1399 */
1400static void
1401lcs_tasklet(unsigned long data)
1402{
1403 unsigned long flags;
1404 struct lcs_channel *channel;
1405 struct lcs_buffer *iob;
1406 int buf_idx;
1407 int rc;
1408
1409 channel = (struct lcs_channel *) data;
1410 LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1411
1412 /* Check for processed buffers. */
1413 iob = channel->iob;
1414 buf_idx = channel->buf_idx;
1415 while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1416 /* Do the callback thing. */
1417 if (iob[buf_idx].callback != NULL)
1418 iob[buf_idx].callback(channel, iob + buf_idx);
1419 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1420 }
1421 channel->buf_idx = buf_idx;
1422
1423 if (channel->state == CH_STATE_STOPPED)
1424 // FIXME: what if rc != 0 ??
1425 rc = lcs_start_channel(channel);
1426 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1427 if (channel->state == CH_STATE_SUSPENDED &&
1428 channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1429 // FIXME: what if rc != 0 ??
1430 rc = __lcs_resume_channel(channel);
1431 }
1432 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1433
1434 /* Something happened on the channel. Wake up waiters. */
1435 wake_up(&channel->wait_q);
1436}
1437
1438/**
1439 * Finish current tx buffer and make it ready for transmit.
1440 */
1441static void
1442__lcs_emit_txbuffer(struct lcs_card *card)
1443{
1444 LCS_DBF_TEXT(5, trace, "emittx");
1445 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1446 card->tx_buffer->count += 2;
1447 lcs_ready_buffer(&card->write, card->tx_buffer);
1448 card->tx_buffer = NULL;
1449 card->tx_emitted++;
1450}
1451
1452/**
1453 * Callback for finished tx buffers.
1454 */
1455static void
1456lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1457{
1458 struct lcs_card *card;
1459
1460 LCS_DBF_TEXT(5, trace, "txbuffcb");
1461 /* Put buffer back to pool. */
1462 lcs_release_buffer(channel, buffer);
1463 card = (struct lcs_card *)
1464 ((char *) channel - offsetof(struct lcs_card, write));
1465 spin_lock(&card->lock);
1466 card->tx_emitted--;
1467 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1468 /*
1469 * Last running tx buffer has finished. Submit partially
1470 * filled current buffer.
1471 */
1472 __lcs_emit_txbuffer(card);
1473 spin_unlock(&card->lock);
1474}
1475
1476/**
1477 * Packet transmit function called by network stack
1478 */
1479static int
1480__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1481 struct net_device *dev)
1482{
1483 struct lcs_header *header;
1484
1485 LCS_DBF_TEXT(5, trace, "hardxmit");
1486 if (skb == NULL) {
1487 card->stats.tx_dropped++;
1488 card->stats.tx_errors++;
1489 return -EIO;
1490 }
1491 if (card->state != DEV_STATE_UP) {
1492 dev_kfree_skb(skb);
1493 card->stats.tx_dropped++;
1494 card->stats.tx_errors++;
1495 card->stats.tx_carrier_errors++;
1496 return 0;
1497 }
1498 if (netif_queue_stopped(dev) ) {
1499 card->stats.tx_dropped++;
1500 return -EBUSY;
1501 }
1502 if (card->tx_buffer != NULL &&
1503 card->tx_buffer->count + sizeof(struct lcs_header) +
1504 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1505 /* skb too big for current tx buffer. */
1506 __lcs_emit_txbuffer(card);
1507 if (card->tx_buffer == NULL) {
1508 /* Get new tx buffer */
1509 card->tx_buffer = lcs_get_buffer(&card->write);
1510 if (card->tx_buffer == NULL) {
1511 card->stats.tx_dropped++;
1512 return -EBUSY;
1513 }
1514 card->tx_buffer->callback = lcs_txbuffer_cb;
1515 card->tx_buffer->count = 0;
1516 }
1517 header = (struct lcs_header *)
1518 (card->tx_buffer->data + card->tx_buffer->count);
1519 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1520 header->offset = card->tx_buffer->count;
1521 header->type = card->lan_type;
1522 header->slot = card->portno;
1523 memcpy(header + 1, skb->data, skb->len);
1524 card->stats.tx_bytes += skb->len;
1525 card->stats.tx_packets++;
1526 dev_kfree_skb(skb);
1527 if (card->tx_emitted <= 0)
1528 /* If this is the first tx buffer emit it immediately. */
1529 __lcs_emit_txbuffer(card);
1530 return 0;
1531}
1532
1533static int
1534lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1535{
1536 struct lcs_card *card;
1537 int rc;
1538
1539 LCS_DBF_TEXT(5, trace, "pktxmit");
1540 card = (struct lcs_card *) dev->priv;
1541 spin_lock(&card->lock);
1542 rc = __lcs_start_xmit(card, skb, dev);
1543 spin_unlock(&card->lock);
1544 return rc;
1545}
1546
1547/**
1548 * send startlan and lanstat command to make LCS device ready
1549 */
1550static int
1551lcs_startlan_auto(struct lcs_card *card)
1552{
1553 int rc;
1554
1555 LCS_DBF_TEXT(2, trace, "strtauto");
1556#ifdef CONFIG_NET_ETHERNET
1557 card->lan_type = LCS_FRAME_TYPE_ENET;
1558 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1559 if (rc == 0)
1560 return 0;
1561
1562#endif
1563#ifdef CONFIG_TR
1564 card->lan_type = LCS_FRAME_TYPE_TR;
1565 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1566 if (rc == 0)
1567 return 0;
1568#endif
1569#ifdef CONFIG_FDDI
1570 card->lan_type = LCS_FRAME_TYPE_FDDI;
1571 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1572 if (rc == 0)
1573 return 0;
1574#endif
1575 return -EIO;
1576}
1577
1578static int
1579lcs_startlan(struct lcs_card *card)
1580{
1581 int rc, i;
1582
1583 LCS_DBF_TEXT(2, trace, "startlan");
1584 rc = 0;
1585 if (card->portno != LCS_INVALID_PORT_NO) {
1586 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1587 rc = lcs_startlan_auto(card);
1588 else
1589 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1590 } else {
1591 for (i = 0; i <= 16; i++) {
1592 card->portno = i;
1593 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1594 rc = lcs_send_startlan(card,
1595 LCS_INITIATOR_TCPIP);
1596 else
1597 /* autodetecting lan type */
1598 rc = lcs_startlan_auto(card);
1599 if (rc == 0)
1600 break;
1601 }
1602 }
1603 if (rc == 0)
1604 return lcs_send_lanstat(card);
1605 return rc;
1606}
1607
1608/**
1609 * LCS detect function
1610 * setup channels and make them I/O ready
1611 */
1612static int
1613lcs_detect(struct lcs_card *card)
1614{
1615 int rc = 0;
1616
1617 LCS_DBF_TEXT(2, setup, "lcsdetct");
1618 /* start/reset card */
1619 if (card->dev)
1620 netif_stop_queue(card->dev);
1621 rc = lcs_stop_channels(card);
1622 if (rc == 0) {
1623 rc = lcs_start_channels(card);
1624 if (rc == 0) {
1625 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1626 if (rc == 0)
1627 rc = lcs_startlan(card);
1628 }
1629 }
1630 if (rc == 0) {
1631 card->state = DEV_STATE_UP;
1632 } else {
1633 card->state = DEV_STATE_DOWN;
1634 card->write.state = CH_STATE_INIT;
1635 card->read.state = CH_STATE_INIT;
1636 }
1637 return rc;
1638}
1639
1640/**
1641 * reset card
1642 */
1643static int
1644lcs_resetcard(struct lcs_card *card)
1645{
1646 int retries;
1647
1648 LCS_DBF_TEXT(2, trace, "rescard");
1649 for (retries = 0; retries < 10; retries++) {
1650 if (lcs_detect(card) == 0) {
1651 netif_wake_queue(card->dev);
1652 card->state = DEV_STATE_UP;
1653 PRINT_INFO("LCS device %s successfully restarted!\n",
1654 card->dev->name);
1655 return 0;
1656 }
1657 msleep(3000);
1658 }
1659 PRINT_ERR("Error in Reseting LCS card!\n");
1660 return -EIO;
1661}
1662
1663
1664/**
1665 * LCS Stop card
1666 */
1667static int
1668lcs_stopcard(struct lcs_card *card)
1669{
1670 int rc;
1671
1672 LCS_DBF_TEXT(3, setup, "stopcard");
1673
1674 if (card->read.state != CH_STATE_STOPPED &&
1675 card->write.state != CH_STATE_STOPPED &&
1676 card->state == DEV_STATE_UP) {
1677 lcs_clear_multicast_list(card);
1678 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1679 rc = lcs_send_shutdown(card);
1680 }
1681 rc = lcs_stop_channels(card);
1682 card->state = DEV_STATE_DOWN;
1683
1684 return rc;
1685}
1686
1687/**
1688 * LGW initiated commands
1689 */
1690static int
1691lcs_lgw_startlan_thread(void *data)
1692{
1693 struct lcs_card *card;
1694
1695 card = (struct lcs_card *) data;
1696 daemonize("lgwstpln");
1697
1698 if (!lcs_do_run_thread(card, LCS_STARTLAN_THREAD))
1699 return 0;
1700 LCS_DBF_TEXT(4, trace, "lgwstpln");
1701 if (card->dev)
1702 netif_stop_queue(card->dev);
1703 if (lcs_startlan(card) == 0) {
1704 netif_wake_queue(card->dev);
1705 card->state = DEV_STATE_UP;
1706 PRINT_INFO("LCS Startlan for device %s succeeded!\n",
1707 card->dev->name);
1708
1709 } else
1710 PRINT_ERR("LCS Startlan for device %s failed!\n",
1711 card->dev->name);
1712 lcs_clear_thread_running_bit(card, LCS_STARTLAN_THREAD);
1713 return 0;
1714}
1715
1716/**
1717 * Send startup command initiated by Lan Gateway
1718 */
1719static int
1720lcs_lgw_startup_thread(void *data)
1721{
1722 int rc;
1723
1724 struct lcs_card *card;
1725
1726 card = (struct lcs_card *) data;
1727 daemonize("lgwstaln");
1728
1729 if (!lcs_do_run_thread(card, LCS_STARTUP_THREAD))
1730 return 0;
1731 LCS_DBF_TEXT(4, trace, "lgwstaln");
1732 if (card->dev)
1733 netif_stop_queue(card->dev);
1734 rc = lcs_send_startup(card, LCS_INITIATOR_LGW);
1735 if (rc != 0) {
1736 PRINT_ERR("Startup for LCS device %s initiated " \
1737 "by LGW failed!\nReseting card ...\n",
1738 card->dev->name);
1739 /* do a card reset */
1740 rc = lcs_resetcard(card);
1741 if (rc == 0)
1742 goto Done;
1743 }
1744 rc = lcs_startlan(card);
1745 if (rc == 0) {
1746 netif_wake_queue(card->dev);
1747 card->state = DEV_STATE_UP;
1748 }
1749Done:
1750 if (rc == 0)
1751 PRINT_INFO("LCS Startup for device %s succeeded!\n",
1752 card->dev->name);
1753 else
1754 PRINT_ERR("LCS Startup for device %s failed!\n",
1755 card->dev->name);
1756 lcs_clear_thread_running_bit(card, LCS_STARTUP_THREAD);
1757 return 0;
1758}
1759
1760
1761/**
1762 * send stoplan command initiated by Lan Gateway
1763 */
1764static int
1765lcs_lgw_stoplan_thread(void *data)
1766{
1767 struct lcs_card *card;
1768 int rc;
1769
1770 card = (struct lcs_card *) data;
1771 daemonize("lgwstop");
1772
1773 if (!lcs_do_run_thread(card, LCS_STOPLAN_THREAD))
1774 return 0;
1775 LCS_DBF_TEXT(4, trace, "lgwstop");
1776 if (card->dev)
1777 netif_stop_queue(card->dev);
1778 if (lcs_send_stoplan(card, LCS_INITIATOR_LGW) == 0)
1779 PRINT_INFO("Stoplan for %s initiated by LGW succeeded!\n",
1780 card->dev->name);
1781 else
1782 PRINT_ERR("Stoplan %s initiated by LGW failed!\n",
1783 card->dev->name);
1784 /*Try to reset the card, stop it on failure */
1785 rc = lcs_resetcard(card);
1786 if (rc != 0)
1787 rc = lcs_stopcard(card);
1788 lcs_clear_thread_running_bit(card, LCS_STOPLAN_THREAD);
1789 return rc;
1790}
1791
1792/**
1793 * Kernel Thread helper functions for LGW initiated commands
1794 */
1795static void
1796lcs_start_kernel_thread(struct lcs_card *card)
1797{
1798 LCS_DBF_TEXT(5, trace, "krnthrd");
1799 if (lcs_do_start_thread(card, LCS_STARTUP_THREAD))
1800 kernel_thread(lcs_lgw_startup_thread, (void *) card, SIGCHLD);
1801 if (lcs_do_start_thread(card, LCS_STARTLAN_THREAD))
1802 kernel_thread(lcs_lgw_startlan_thread, (void *) card, SIGCHLD);
1803 if (lcs_do_start_thread(card, LCS_STOPLAN_THREAD))
1804 kernel_thread(lcs_lgw_stoplan_thread, (void *) card, SIGCHLD);
1805#ifdef CONFIG_IP_MULTICAST
1806 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1807 kernel_thread(lcs_register_mc_addresses, (void *) card, SIGCHLD);
1808#endif
1809}
1810
1811/**
1812 * Process control frames.
1813 */
1814static void
1815lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1816{
1817 LCS_DBF_TEXT(5, trace, "getctrl");
1818 if (cmd->initiator == LCS_INITIATOR_LGW) {
1819 switch(cmd->cmd_code) {
1820 case LCS_CMD_STARTUP:
1821 if (!lcs_set_thread_start_bit(card,
1822 LCS_STARTUP_THREAD))
1823 schedule_work(&card->kernel_thread_starter);
1824 break;
1825 case LCS_CMD_STARTLAN:
1826 if (!lcs_set_thread_start_bit(card,
1827 LCS_STARTLAN_THREAD))
1828 schedule_work(&card->kernel_thread_starter);
1829 break;
1830 case LCS_CMD_STOPLAN:
1831 if (!lcs_set_thread_start_bit(card,
1832 LCS_STOPLAN_THREAD))
1833 schedule_work(&card->kernel_thread_starter);
1834 break;
1835 default:
1836 PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1837 break;
1838 }
1839 } else
1840 lcs_notify_lancmd_waiters(card, cmd);
1841}
1842
1843/**
1844 * Unpack network packet.
1845 */
1846static void
1847lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1848{
1849 struct sk_buff *skb;
1850
1851 LCS_DBF_TEXT(5, trace, "getskb");
1852 if (card->dev == NULL ||
1853 card->state != DEV_STATE_UP)
1854 /* The card isn't up. Ignore the packet. */
1855 return;
1856
1857 skb = dev_alloc_skb(skb_len);
1858 if (skb == NULL) {
1859 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1860 card->dev->name);
1861 card->stats.rx_dropped++;
1862 return;
1863 }
1864 skb->dev = card->dev;
1865 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1866 skb->protocol = card->lan_type_trans(skb, card->dev);
1867 card->stats.rx_bytes += skb_len;
1868 card->stats.rx_packets++;
1869 *((__u32 *)skb->cb) = ++card->pkt_seq;
1870 netif_rx(skb);
1871}
1872
1873/**
1874 * LCS main routine to get packets and lancmd replies from the buffers
1875 */
1876static void
1877lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1878{
1879 struct lcs_card *card;
1880 struct lcs_header *lcs_hdr;
1881 __u16 offset;
1882
1883 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1884 lcs_hdr = (struct lcs_header *) buffer->data;
1885 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1886 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1887 return;
1888 }
1889 card = (struct lcs_card *)
1890 ((char *) channel - offsetof(struct lcs_card, read));
1891 offset = 0;
1892 while (lcs_hdr->offset != 0) {
1893 if (lcs_hdr->offset <= 0 ||
1894 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1895 lcs_hdr->offset < offset) {
1896 /* Offset invalid. */
1897 card->stats.rx_length_errors++;
1898 card->stats.rx_errors++;
1899 return;
1900 }
1901 /* What kind of frame is it? */
1902 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1903 /* Control frame. */
1904 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1905 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1906 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1907 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1908 /* Normal network packet. */
1909 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1910 lcs_hdr->offset - offset -
1911 sizeof(struct lcs_header));
1912 else
1913 /* Unknown frame type. */
1914 ; // FIXME: error message ?
1915 /* Proceed to next frame. */
1916 offset = lcs_hdr->offset;
1917 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1918 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1919 }
1920 /* The buffer is now empty. Make it ready again. */
1921 lcs_ready_buffer(&card->read, buffer);
1922}
1923
1924/**
1925 * get network statistics for ifconfig and other user programs
1926 */
1927static struct net_device_stats *
1928lcs_getstats(struct net_device *dev)
1929{
1930 struct lcs_card *card;
1931
1932 LCS_DBF_TEXT(4, trace, "netstats");
1933 card = (struct lcs_card *) dev->priv;
1934 return &card->stats;
1935}
1936
1937/**
1938 * stop lcs device
1939 * This function will be called by user doing ifconfig xxx down
1940 */
1941static int
1942lcs_stop_device(struct net_device *dev)
1943{
1944 struct lcs_card *card;
1945 int rc;
1946
1947 LCS_DBF_TEXT(2, trace, "stopdev");
1948 card = (struct lcs_card *) dev->priv;
1949 netif_stop_queue(dev);
1950 dev->flags &= ~IFF_UP;
1951 rc = lcs_stopcard(card);
1952 if (rc)
1953 PRINT_ERR("Try it again!\n ");
1954 return rc;
1955}
1956
1957/**
1958 * start lcs device and make it runnable
1959 * This function will be called by user doing ifconfig xxx up
1960 */
1961static int
1962lcs_open_device(struct net_device *dev)
1963{
1964 struct lcs_card *card;
1965 int rc;
1966
1967 LCS_DBF_TEXT(2, trace, "opendev");
1968 card = (struct lcs_card *) dev->priv;
1969 /* initialize statistics */
1970 rc = lcs_detect(card);
1971 if (rc) {
1972 PRINT_ERR("LCS:Error in opening device!\n");
1973
1974 } else {
1975 dev->flags |= IFF_UP;
1976 netif_wake_queue(dev);
1977 card->state = DEV_STATE_UP;
1978 }
1979 return rc;
1980}
1981
1982/**
1983 * show function for portno called by cat or similar things
1984 */
1985static ssize_t
3fd3c0a5 1986lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 1987{
1988 struct lcs_card *card;
1989
1990 card = (struct lcs_card *)dev->driver_data;
1991
1992 if (!card)
1993 return 0;
1994
1995 return sprintf(buf, "%d\n", card->portno);
1996}
1997
1998/**
1999 * store the value which is piped to file portno
2000 */
2001static ssize_t
3fd3c0a5 2002lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1da177e4
LT		 2003{
2004 struct lcs_card *card;
2005 int value;
2006
2007 card = (struct lcs_card *)dev->driver_data;
2008
2009 if (!card)
2010 return 0;
2011
2012 sscanf(buf, "%u", &value);
2013 /* TODO: sanity checks */
2014 card->portno = value;
2015
2016 return count;
2017
2018}
2019
2020static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
2021
2022static ssize_t
3fd3c0a5 2023lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 2024{
2025 struct ccwgroup_device *cgdev;
2026
2027 cgdev = to_ccwgroupdev(dev);
2028 if (!cgdev)
2029 return -ENODEV;
2030
2031 return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
2032}
2033
2034static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
2035
2036static ssize_t
3fd3c0a5 2037lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1da177e4
LT		 2038{
2039 struct lcs_card *card;
2040
2041 card = (struct lcs_card *)dev->driver_data;
2042
2043 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2044}
2045
2046static ssize_t
3fd3c0a5 2047lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1da177e4
LT		 2048{
2049 struct lcs_card *card;
2050 int value;
2051
2052 card = (struct lcs_card *)dev->driver_data;
2053
2054 if (!card)
2055 return 0;
2056
2057 sscanf(buf, "%u", &value);
2058 /* TODO: sanity checks */
2059 card->lancmd_timeout = value;
2060
2061 return count;
2062
2063}
2064
2065DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2066
2067static struct attribute * lcs_attrs[] = {
2068 &dev_attr_portno.attr,
2069 &dev_attr_type.attr,
2070 &dev_attr_lancmd_timeout.attr,
2071 NULL,
2072};
2073
2074static struct attribute_group lcs_attr_group = {
2075 .attrs = lcs_attrs,
2076};
2077
2078/**
2079 * lcs_probe_device is called on establishing a new ccwgroup_device.
2080 */
2081static int
2082lcs_probe_device(struct ccwgroup_device *ccwgdev)
2083{
2084 struct lcs_card *card;
2085 int ret;
2086
2087 if (!get_device(&ccwgdev->dev))
2088 return -ENODEV;
2089
2090 LCS_DBF_TEXT(2, setup, "add_dev");
2091 card = lcs_alloc_card();
2092 if (!card) {
2093 PRINT_ERR("Allocation of lcs card failed\n");
2094 put_device(&ccwgdev->dev);
2095 return -ENOMEM;
2096 }
2097 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2098 if (ret) {
2099 PRINT_ERR("Creating attributes failed");
2100 lcs_free_card(card);
2101 put_device(&ccwgdev->dev);
2102 return ret;
2103 }
2104 ccwgdev->dev.driver_data = card;
2105 ccwgdev->cdev[0]->handler = lcs_irq;
2106 ccwgdev->cdev[1]->handler = lcs_irq;
2107 return 0;
2108}
2109
2110static int
2111lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2112{
2113 struct lcs_card *card;
2114
2115 LCS_DBF_TEXT(2, setup, "regnetdv");
2116 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2117 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2118 return 0;
2119 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2120 return register_netdev(card->dev);
2121}
2122
2123/**
2124 * lcs_new_device will be called by setting the group device online.
2125 */
2126
2127static int
2128lcs_new_device(struct ccwgroup_device *ccwgdev)
2129{
2130 struct lcs_card *card;
2131 struct net_device *dev=NULL;
2132 enum lcs_dev_states recover_state;
2133 int rc;
2134
2135 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2136 if (!card)
2137 return -ENODEV;
2138
2139 LCS_DBF_TEXT(2, setup, "newdev");
2140 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2141 card->read.ccwdev = ccwgdev->cdev[0];
2142 card->write.ccwdev = ccwgdev->cdev[1];
2143
2144 recover_state = card->state;
2145 ccw_device_set_online(card->read.ccwdev);
2146 ccw_device_set_online(card->write.ccwdev);
2147
2148 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2149
2150 lcs_setup_card(card);
2151 rc = lcs_detect(card);
2152 if (rc) {
2153 LCS_DBF_TEXT(2, setup, "dtctfail");
2154 PRINT_WARN("Detection of LCS card failed with return code "
2155 "%d (0x%x)\n", rc, rc);
2156 lcs_stopcard(card);
2157 goto out;
2158 }
2159 if (card->dev) {
2160 LCS_DBF_TEXT(2, setup, "samedev");
2161 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2162 goto netdev_out;
2163 }
2164 switch (card->lan_type) {
2165#ifdef CONFIG_NET_ETHERNET
2166 case LCS_FRAME_TYPE_ENET:
2167 card->lan_type_trans = eth_type_trans;
2168 dev = alloc_etherdev(0);
2169 break;
2170#endif
2171#ifdef CONFIG_TR
2172 case LCS_FRAME_TYPE_TR:
2173 card->lan_type_trans = tr_type_trans;
2174 dev = alloc_trdev(0);
2175 break;
2176#endif
2177#ifdef CONFIG_FDDI
2178 case LCS_FRAME_TYPE_FDDI:
2179 card->lan_type_trans = fddi_type_trans;
2180 dev = alloc_fddidev(0);
2181 break;
2182#endif
2183 default:
2184 LCS_DBF_TEXT(3, setup, "errinit");
2185 PRINT_ERR("LCS: Initialization failed\n");
2186 PRINT_ERR("LCS: No device found!\n");
2187 goto out;
2188 }
2189 if (!dev)
2190 goto out;
2191 card->dev = dev;
1da177e4
LT		 2192 card->dev->priv = card;
2193 card->dev->open = lcs_open_device;
2194 card->dev->stop = lcs_stop_device;
2195 card->dev->hard_start_xmit = lcs_start_xmit;
2196 card->dev->get_stats = lcs_getstats;
2197 SET_MODULE_OWNER(dev);
1da177e4
LT		 2198 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2199#ifdef CONFIG_IP_MULTICAST
2200 if (!lcs_check_multicast_support(card))
2201 card->dev->set_multicast_list = lcs_set_multicast_list;
2202#endif
b5f9d55b 2203netdev_out:
1da177e4
LT		 2204 lcs_set_allowed_threads(card,0xffffffff);
2205 if (recover_state == DEV_STATE_RECOVER) {
2206 lcs_set_multicast_list(card->dev);
2207 card->dev->flags |= IFF_UP;
2208 netif_wake_queue(card->dev);
2209 card->state = DEV_STATE_UP;
b5f9d55b 2210 } else {
1da177e4 2211 lcs_stopcard(card);
b5f9d55b 2212 }
1da177e4 2213
b5f9d55b
FP		 2214 if (lcs_register_netdev(ccwgdev) != 0)
2215 goto out;
2216
2217 /* Print out supported assists: IPv6 */
2218 PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
2219 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2220 "with" : "without");
2221 /* Print out supported assist: Multicast */
2222 PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
2223 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2224 "with" : "without");
1da177e4
LT		 2225 return 0;
2226out:
2227
2228 ccw_device_set_offline(card->read.ccwdev);
2229 ccw_device_set_offline(card->write.ccwdev);
2230 return -ENODEV;
2231}
2232
2233/**
2234 * lcs_shutdown_device, called when setting the group device offline.
2235 */
2236static int
2237lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2238{
2239 struct lcs_card *card;
2240 enum lcs_dev_states recover_state;
2241 int ret;
2242
2243 LCS_DBF_TEXT(3, setup, "shtdndev");
2244 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2245 if (!card)
2246 return -ENODEV;
2247 lcs_set_allowed_threads(card, 0);
2248 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2249 return -ERESTARTSYS;
2250 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2251 recover_state = card->state;
2252
2253 ret = lcs_stop_device(card->dev);
2254 ret = ccw_device_set_offline(card->read.ccwdev);
2255 ret = ccw_device_set_offline(card->write.ccwdev);
2256 if (recover_state == DEV_STATE_UP) {
2257 card->state = DEV_STATE_RECOVER;
2258 }
2259 if (ret)
2260 return ret;
2261 return 0;
2262}
2263
2264/**
2265 * lcs_remove_device, free buffers and card
2266 */
2267static void
2268lcs_remove_device(struct ccwgroup_device *ccwgdev)
2269{
2270 struct lcs_card *card;
2271
2272 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2273 if (!card)
2274 return;
2275
2276 PRINT_INFO("Removing lcs group device ....\n");
2277 LCS_DBF_TEXT(3, setup, "remdev");
2278 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2279 if (ccwgdev->state == CCWGROUP_ONLINE) {
2280 lcs_shutdown_device(ccwgdev);
2281 }
2282 if (card->dev)
2283 unregister_netdev(card->dev);
2284 sysfs_remove_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2285 lcs_cleanup_card(card);
2286 lcs_free_card(card);
2287 put_device(&ccwgdev->dev);
2288}
2289
2290/**
2291 * LCS ccwgroup driver registration
2292 */
2293static struct ccwgroup_driver lcs_group_driver = {
2294 .owner = THIS_MODULE,
2295 .name = "lcs",
2296 .max_slaves = 2,
2297 .driver_id = 0xD3C3E2,
2298 .probe = lcs_probe_device,
2299 .remove = lcs_remove_device,
2300 .set_online = lcs_new_device,
2301 .set_offline = lcs_shutdown_device,
2302};
2303
2304/**
2305 * LCS Module/Kernel initialization function
2306 */
2307static int
2308__init lcs_init_module(void)
2309{
2310 int rc;
2311
2312 PRINT_INFO("Loading %s\n",version);
2313 rc = lcs_register_debug_facility();
2314 LCS_DBF_TEXT(0, setup, "lcsinit");
2315 if (rc) {
2316 PRINT_ERR("Initialization failed\n");
2317 return rc;
2318 }
2319
2320 rc = register_cu3088_discipline(&lcs_group_driver);
2321 if (rc) {
2322 PRINT_ERR("Initialization failed\n");
2323 return rc;
2324 }
2325
2326 return 0;
2327}
2328
2329
2330/**
2331 * LCS module cleanup function
2332 */
2333static void
2334__exit lcs_cleanup_module(void)
2335{
2336 PRINT_INFO("Terminating lcs module.\n");
2337 LCS_DBF_TEXT(0, trace, "cleanup");
2338 unregister_cu3088_discipline(&lcs_group_driver);
2339 lcs_unregister_debug_facility();
2340}
2341
2342module_init(lcs_init_module);
2343module_exit(lcs_cleanup_module);
2344
2345MODULE_AUTHOR("Frank Pavlic <pavlic@de.ibm.com>");
2346MODULE_LICENSE("GPL");
2347
Linux kernel - Deliverables
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