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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/s390/net/lcs.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/s390/net/lcs.c')
-rw-r--r--drivers/s390/net/lcs.c2347
1 files changed, 2347 insertions, 0 deletions
diff --git a/drivers/s390/net/lcs.c b/drivers/s390/net/lcs.c
new file mode 100644
index 000000000000..0f76e945b984
--- /dev/null
+++ b/drivers/s390/net/lcs.c
@@ -0,0 +1,2347 @@
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 *
14 * $Revision: 1.96 $ $Date: 2004/11/11 13:42:33 $
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 */
62#define VERSION_LCS_C "$Revision: 1.96 $"
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{
96 lcs_dbf_setup = debug_register("lcs_setup", 1, 1, 8);
97 lcs_dbf_trace = debug_register("lcs_trace", 1, 2, 8);
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++) {
148 if (channel->iob[cnt].data != NULL)
149 kfree(channel->iob[cnt].data);
150 channel->iob[cnt].data = NULL;
151 }
152}
153
154/*
155 * Cleanup channel.
156 */
157static void
158lcs_cleanup_channel(struct lcs_channel *channel)
159{
160 LCS_DBF_TEXT(3, setup, "cleanch");
161 /* Kill write channel tasklets. */
162 tasklet_kill(&channel->irq_tasklet);
163 /* Free channel buffers. */
164 lcs_free_channel(channel);
165}
166
167/**
168 * LCS free memory for card and channels.
169 */
170static void
171lcs_free_card(struct lcs_card *card)
172{
173 LCS_DBF_TEXT(2, setup, "remcard");
174 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
175 kfree(card);
176}
177
178/**
179 * LCS alloc memory for card and channels
180 */
181static struct lcs_card *
182lcs_alloc_card(void)
183{
184 struct lcs_card *card;
185 int rc;
186
187 LCS_DBF_TEXT(2, setup, "alloclcs");
188
189 card = kmalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
190 if (card == NULL)
191 return NULL;
192 memset(card, 0, sizeof(struct lcs_card));
193 card->lan_type = LCS_FRAME_TYPE_AUTO;
194 card->pkt_seq = 0;
195 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
196 /* Allocate io buffers for the read channel. */
197 rc = lcs_alloc_channel(&card->read);
198 if (rc){
199 LCS_DBF_TEXT(2, setup, "iccwerr");
200 lcs_free_card(card);
201 return NULL;
202 }
203 /* Allocate io buffers for the write channel. */
204 rc = lcs_alloc_channel(&card->write);
205 if (rc) {
206 LCS_DBF_TEXT(2, setup, "iccwerr");
207 lcs_cleanup_channel(&card->read);
208 lcs_free_card(card);
209 return NULL;
210 }
211
212#ifdef CONFIG_IP_MULTICAST
213 INIT_LIST_HEAD(&card->ipm_list);
214#endif
215 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
216 return card;
217}
218
219/*
220 * Setup read channel.
221 */
222static void
223lcs_setup_read_ccws(struct lcs_card *card)
224{
225 int cnt;
226
227 LCS_DBF_TEXT(2, setup, "ireadccw");
228 /* Setup read ccws. */
229 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
230 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
231 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
232 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
233 card->read.ccws[cnt].flags =
234 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
235 /*
236 * Note: we have allocated the buffer with GFP_DMA, so
237 * we do not need to do set_normalized_cda.
238 */
239 card->read.ccws[cnt].cda =
240 (__u32) __pa(card->read.iob[cnt].data);
241 ((struct lcs_header *)
242 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
243 card->read.iob[cnt].callback = lcs_get_frames_cb;
244 card->read.iob[cnt].state = BUF_STATE_READY;
245 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
246 }
247 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
248 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
249 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
250 /* Last ccw is a tic (transfer in channel). */
251 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
252 card->read.ccws[LCS_NUM_BUFFS].cda =
253 (__u32) __pa(card->read.ccws);
254 /* Setg initial state of the read channel. */
255 card->read.state = CH_STATE_INIT;
256
257 card->read.io_idx = 0;
258 card->read.buf_idx = 0;
259}
260
261static void
262lcs_setup_read(struct lcs_card *card)
263{
264 LCS_DBF_TEXT(3, setup, "initread");
265
266 lcs_setup_read_ccws(card);
267 /* Initialize read channel tasklet. */
268 card->read.irq_tasklet.data = (unsigned long) &card->read;
269 card->read.irq_tasklet.func = lcs_tasklet;
270 /* Initialize waitqueue. */
271 init_waitqueue_head(&card->read.wait_q);
272}
273
274/*
275 * Setup write channel.
276 */
277static void
278lcs_setup_write_ccws(struct lcs_card *card)
279{
280 int cnt;
281
282 LCS_DBF_TEXT(3, setup, "iwritccw");
283 /* Setup write ccws. */
284 memset(card->write.ccws, 0, sizeof(struct ccw1) * LCS_NUM_BUFFS + 1);
285 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
286 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
287 card->write.ccws[cnt].count = 0;
288 card->write.ccws[cnt].flags =
289 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
290 /*
291 * Note: we have allocated the buffer with GFP_DMA, so
292 * we do not need to do set_normalized_cda.
293 */
294 card->write.ccws[cnt].cda =
295 (__u32) __pa(card->write.iob[cnt].data);
296 }
297 /* Last ccw is a tic (transfer in channel). */
298 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
299 card->write.ccws[LCS_NUM_BUFFS].cda =
300 (__u32) __pa(card->write.ccws);
301 /* Set initial state of the write channel. */
302 card->read.state = CH_STATE_INIT;
303
304 card->write.io_idx = 0;
305 card->write.buf_idx = 0;
306}
307
308static void
309lcs_setup_write(struct lcs_card *card)
310{
311 LCS_DBF_TEXT(3, setup, "initwrit");
312
313 lcs_setup_write_ccws(card);
314 /* Initialize write channel tasklet. */
315 card->write.irq_tasklet.data = (unsigned long) &card->write;
316 card->write.irq_tasklet.func = lcs_tasklet;
317 /* Initialize waitqueue. */
318 init_waitqueue_head(&card->write.wait_q);
319}
320
321static void
322lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
323{
324 unsigned long flags;
325
326 spin_lock_irqsave(&card->mask_lock, flags);
327 card->thread_allowed_mask = threads;
328 spin_unlock_irqrestore(&card->mask_lock, flags);
329 wake_up(&card->wait_q);
330}
331static inline int
332lcs_threads_running(struct lcs_card *card, unsigned long threads)
333{
334 unsigned long flags;
335 int rc = 0;
336
337 spin_lock_irqsave(&card->mask_lock, flags);
338 rc = (card->thread_running_mask & threads);
339 spin_unlock_irqrestore(&card->mask_lock, flags);
340 return rc;
341}
342
343static int
344lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
345{
346 return wait_event_interruptible(card->wait_q,
347 lcs_threads_running(card, threads) == 0);
348}
349
350static inline int
351lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
352{
353 unsigned long flags;
354
355 spin_lock_irqsave(&card->mask_lock, flags);
356 if ( !(card->thread_allowed_mask & thread) ||
357 (card->thread_start_mask & thread) ) {
358 spin_unlock_irqrestore(&card->mask_lock, flags);
359 return -EPERM;
360 }
361 card->thread_start_mask |= thread;
362 spin_unlock_irqrestore(&card->mask_lock, flags);
363 return 0;
364}
365
366static void
367lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
368{
369 unsigned long flags;
370
371 spin_lock_irqsave(&card->mask_lock, flags);
372 card->thread_running_mask &= ~thread;
373 spin_unlock_irqrestore(&card->mask_lock, flags);
374 wake_up(&card->wait_q);
375}
376
377static inline int
378__lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
379{
380 unsigned long flags;
381 int rc = 0;
382
383 spin_lock_irqsave(&card->mask_lock, flags);
384 if (card->thread_start_mask & thread){
385 if ((card->thread_allowed_mask & thread) &&
386 !(card->thread_running_mask & thread)){
387 rc = 1;
388 card->thread_start_mask &= ~thread;
389 card->thread_running_mask |= thread;
390 } else
391 rc = -EPERM;
392 }
393 spin_unlock_irqrestore(&card->mask_lock, flags);
394 return rc;
395}
396
397static int
398lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
399{
400 int rc = 0;
401 wait_event(card->wait_q,
402 (rc = __lcs_do_run_thread(card, thread)) >= 0);
403 return rc;
404}
405
406static int
407lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
408{
409 unsigned long flags;
410 int rc = 0;
411
412 spin_lock_irqsave(&card->mask_lock, flags);
413 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
414 (u8) card->thread_start_mask,
415 (u8) card->thread_allowed_mask,
416 (u8) card->thread_running_mask);
417 rc = (card->thread_start_mask & thread);
418 spin_unlock_irqrestore(&card->mask_lock, flags);
419 return rc;
420}
421
422/**
423 * Initialize channels,card and state machines.
424 */
425static void
426lcs_setup_card(struct lcs_card *card)
427{
428 LCS_DBF_TEXT(2, setup, "initcard");
429 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
430
431 lcs_setup_read(card);
432 lcs_setup_write(card);
433 /* Set cards initial state. */
434 card->state = DEV_STATE_DOWN;
435 card->tx_buffer = NULL;
436 card->tx_emitted = 0;
437
438 /* Initialize kernel thread task used for LGW commands. */
439 INIT_WORK(&card->kernel_thread_starter,
440 (void *)lcs_start_kernel_thread,card);
441 card->thread_start_mask = 0;
442 card->thread_allowed_mask = 0;
443 card->thread_running_mask = 0;
444 init_waitqueue_head(&card->wait_q);
445 spin_lock_init(&card->lock);
446 spin_lock_init(&card->ipm_lock);
447 spin_lock_init(&card->mask_lock);
448#ifdef CONFIG_IP_MULTICAST
449 INIT_LIST_HEAD(&card->ipm_list);
450#endif
451 INIT_LIST_HEAD(&card->lancmd_waiters);
452}
453
454static inline void
455lcs_clear_multicast_list(struct lcs_card *card)
456{
457#ifdef CONFIG_IP_MULTICAST
458 struct lcs_ipm_list *ipm;
459 unsigned long flags;
460
461 /* Free multicast list. */
462 LCS_DBF_TEXT(3, setup, "clmclist");
463 spin_lock_irqsave(&card->ipm_lock, flags);
464 while (!list_empty(&card->ipm_list)){
465 ipm = list_entry(card->ipm_list.next,
466 struct lcs_ipm_list, list);
467 list_del(&ipm->list);
468 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
469 spin_unlock_irqrestore(&card->ipm_lock, flags);
470 lcs_send_delipm(card, ipm);
471 spin_lock_irqsave(&card->ipm_lock, flags);
472 }
473 kfree(ipm);
474 }
475 spin_unlock_irqrestore(&card->ipm_lock, flags);
476#endif
477}
478/**
479 * Cleanup channels,card and state machines.
480 */
481static void
482lcs_cleanup_card(struct lcs_card *card)
483{
484
485 LCS_DBF_TEXT(3, setup, "cleancrd");
486 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
487
488 if (card->dev != NULL)
489 free_netdev(card->dev);
490 /* Cleanup channels. */
491 lcs_cleanup_channel(&card->write);
492 lcs_cleanup_channel(&card->read);
493}
494
495/**
496 * Start channel.
497 */
498static int
499lcs_start_channel(struct lcs_channel *channel)
500{
501 unsigned long flags;
502 int rc;
503
504 LCS_DBF_TEXT_(4,trace,"ssch%s", channel->ccwdev->dev.bus_id);
505 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
506 rc = ccw_device_start(channel->ccwdev,
507 channel->ccws + channel->io_idx, 0, 0,
508 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
509 if (rc == 0)
510 channel->state = CH_STATE_RUNNING;
511 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
512 if (rc) {
513 LCS_DBF_TEXT_(4,trace,"essh%s", channel->ccwdev->dev.bus_id);
514 PRINT_ERR("Error in starting channel, rc=%d!\n", rc);
515 }
516 return rc;
517}
518
519static int
520lcs_clear_channel(struct lcs_channel *channel)
521{
522 unsigned long flags;
523 int rc;
524
525 LCS_DBF_TEXT(4,trace,"clearch");
526 LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
527 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
528 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
529 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
530 if (rc) {
531 LCS_DBF_TEXT_(4,trace,"ecsc%s", channel->ccwdev->dev.bus_id);
532 return rc;
533 }
534 wait_event(channel->wait_q, (channel->state == CH_STATE_CLEARED));
535 channel->state = CH_STATE_STOPPED;
536 return rc;
537}
538
539
540/**
541 * Stop channel.
542 */
543static int
544lcs_stop_channel(struct lcs_channel *channel)
545{
546 unsigned long flags;
547 int rc;
548
549 if (channel->state == CH_STATE_STOPPED)
550 return 0;
551 LCS_DBF_TEXT(4,trace,"haltsch");
552 LCS_DBF_TEXT_(4,trace,"%s", channel->ccwdev->dev.bus_id);
553 channel->state = CH_STATE_INIT;
554 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
555 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
556 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
557 if (rc) {
558 LCS_DBF_TEXT_(4,trace,"ehsc%s", channel->ccwdev->dev.bus_id);
559 return rc;
560 }
561 /* Asynchronous halt initialted. Wait for its completion. */
562 wait_event(channel->wait_q, (channel->state == CH_STATE_HALTED));
563 lcs_clear_channel(channel);
564 return 0;
565}
566
567/**
568 * start read and write channel
569 */
570static int
571lcs_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 */
590static int
591lcs_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 */
602static 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 == BUF_STATE_EMPTY) {
611 channel->iob[index].state = 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
619static struct lcs_buffer *
620lcs_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 */
635static int
636__lcs_resume_channel(struct lcs_channel *channel)
637{
638 int rc;
639
640 if (channel->state != 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", channel->ccwdev->dev.bus_id);
645 rc = ccw_device_resume(channel->ccwdev);
646 if (rc) {
647 LCS_DBF_TEXT_(4, trace, "ersc%s", channel->ccwdev->dev.bus_id);
648 PRINT_ERR("Error in lcs_resume_channel: rc=%d\n",rc);
649 } else
650 channel->state = CH_STATE_RUNNING;
651 return rc;
652
653}
654
655/**
656 * Make a buffer ready for processing.
657 */
658static inline void
659__lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
660{
661 int prev, next;
662
663 LCS_DBF_TEXT(5, trace, "rdybits");
664 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
665 next = (index + 1) & (LCS_NUM_BUFFS - 1);
666 /* Check if we may clear the suspend bit of this buffer. */
667 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
668 /* Check if we have to set the PCI bit. */
669 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
670 /* Suspend bit of the previous buffer is not set. */
671 channel->ccws[index].flags |= CCW_FLAG_PCI;
672 /* Suspend bit of the next buffer is set. */
673 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
674 }
675}
676
677static int
678lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
679{
680 unsigned long flags;
681 int index, rc;
682
683 LCS_DBF_TEXT(5, trace, "rdybuff");
684 if (buffer->state != BUF_STATE_LOCKED &&
685 buffer->state != BUF_STATE_PROCESSED)
686 BUG();
687 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
688 buffer->state = BUF_STATE_READY;
689 index = buffer - channel->iob;
690 /* Set length. */
691 channel->ccws[index].count = buffer->count;
692 /* Check relevant PCI/suspend bits. */
693 __lcs_ready_buffer_bits(channel, index);
694 rc = __lcs_resume_channel(channel);
695 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
696 return rc;
697}
698
699/**
700 * Mark the buffer as processed. Take care of the suspend bit
701 * of the previous buffer. This function is called from
702 * interrupt context, so the lock must not be taken.
703 */
704static int
705__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
706{
707 int index, prev, next;
708
709 LCS_DBF_TEXT(5, trace, "prcsbuff");
710 if (buffer->state != BUF_STATE_READY)
711 BUG();
712 buffer->state = BUF_STATE_PROCESSED;
713 index = buffer - channel->iob;
714 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
715 next = (index + 1) & (LCS_NUM_BUFFS - 1);
716 /* Set the suspend bit and clear the PCI bit of this buffer. */
717 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
718 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
719 /* Check the suspend bit of the previous buffer. */
720 if (channel->iob[prev].state == BUF_STATE_READY) {
721 /*
722 * Previous buffer is in state ready. It might have
723 * happened in lcs_ready_buffer that the suspend bit
724 * has not been cleared to avoid an endless loop.
725 * Do it now.
726 */
727 __lcs_ready_buffer_bits(channel, prev);
728 }
729 /* Clear PCI bit of next buffer. */
730 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
731 return __lcs_resume_channel(channel);
732}
733
734/**
735 * Put a processed buffer back to state empty.
736 */
737static void
738lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
739{
740 unsigned long flags;
741
742 LCS_DBF_TEXT(5, trace, "relbuff");
743 if (buffer->state != BUF_STATE_LOCKED &&
744 buffer->state != BUF_STATE_PROCESSED)
745 BUG();
746 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
747 buffer->state = BUF_STATE_EMPTY;
748 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
749}
750
751/**
752 * Get buffer for a lan command.
753 */
754static struct lcs_buffer *
755lcs_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
776static void
777lcs_get_reply(struct lcs_reply *reply)
778{
779 WARN_ON(atomic_read(&reply->refcnt) <= 0);
780 atomic_inc(&reply->refcnt);
781}
782
783static void
784lcs_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
793static struct lcs_reply *
794lcs_alloc_reply(struct lcs_cmd *cmd)
795{
796 struct lcs_reply *reply;
797
798 LCS_DBF_TEXT(4, trace, "getreply");
799
800 reply = kmalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
801 if (!reply)
802 return NULL;
803 memset(reply,0,sizeof(struct lcs_reply));
804 atomic_set(&reply->refcnt,1);
805 reply->sequence_no = cmd->sequence_no;
806 reply->received = 0;
807 reply->rc = 0;
808 init_waitqueue_head(&reply->wait_q);
809
810 return reply;
811}
812
813/**
814 * Notifier function for lancmd replies. Called from read irq.
815 */
816static void
817lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
818{
819 struct list_head *l, *n;
820 struct lcs_reply *reply;
821
822 LCS_DBF_TEXT(4, trace, "notiwait");
823 spin_lock(&card->lock);
824 list_for_each_safe(l, n, &card->lancmd_waiters) {
825 reply = list_entry(l, struct lcs_reply, list);
826 if (reply->sequence_no == cmd->sequence_no) {
827 lcs_get_reply(reply);
828 list_del_init(&reply->list);
829 if (reply->callback != NULL)
830 reply->callback(card, cmd);
831 reply->received = 1;
832 reply->rc = cmd->return_code;
833 wake_up(&reply->wait_q);
834 lcs_put_reply(reply);
835 break;
836 }
837 }
838 spin_unlock(&card->lock);
839}
840
841/**
842 * Emit buffer of a lan comand.
843 */
844void
845lcs_lancmd_timeout(unsigned long data)
846{
847 struct lcs_reply *reply, *list_reply, *r;
848 unsigned long flags;
849
850 LCS_DBF_TEXT(4, trace, "timeout");
851 reply = (struct lcs_reply *) data;
852 spin_lock_irqsave(&reply->card->lock, flags);
853 list_for_each_entry_safe(list_reply, r,
854 &reply->card->lancmd_waiters,list) {
855 if (reply == list_reply) {
856 lcs_get_reply(reply);
857 list_del_init(&reply->list);
858 spin_unlock_irqrestore(&reply->card->lock, flags);
859 reply->received = 1;
860 reply->rc = -ETIME;
861 wake_up(&reply->wait_q);
862 lcs_put_reply(reply);
863 return;
864 }
865 }
866 spin_unlock_irqrestore(&reply->card->lock, flags);
867}
868
869static int
870lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
871 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
872{
873 struct lcs_reply *reply;
874 struct lcs_cmd *cmd;
875 struct timer_list timer;
876 unsigned long flags;
877 int rc;
878
879 LCS_DBF_TEXT(4, trace, "sendcmd");
880 cmd = (struct lcs_cmd *) buffer->data;
881 cmd->return_code = 0;
882 cmd->sequence_no = card->sequence_no++;
883 reply = lcs_alloc_reply(cmd);
884 if (!reply)
885 return -ENOMEM;
886 reply->callback = reply_callback;
887 reply->card = card;
888 spin_lock_irqsave(&card->lock, flags);
889 list_add_tail(&reply->list, &card->lancmd_waiters);
890 spin_unlock_irqrestore(&card->lock, flags);
891
892 buffer->callback = lcs_release_buffer;
893 rc = lcs_ready_buffer(&card->write, buffer);
894 if (rc)
895 return rc;
896 init_timer(&timer);
897 timer.function = lcs_lancmd_timeout;
898 timer.data = (unsigned long) reply;
899 timer.expires = jiffies + HZ*card->lancmd_timeout;
900 add_timer(&timer);
901 wait_event(reply->wait_q, reply->received);
902 del_timer_sync(&timer);
903 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
904 rc = reply->rc;
905 lcs_put_reply(reply);
906 return rc ? -EIO : 0;
907}
908
909/**
910 * LCS startup command
911 */
912static int
913lcs_send_startup(struct lcs_card *card, __u8 initiator)
914{
915 struct lcs_buffer *buffer;
916 struct lcs_cmd *cmd;
917
918 LCS_DBF_TEXT(2, trace, "startup");
919 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
920 cmd = (struct lcs_cmd *) buffer->data;
921 cmd->cmd_code = LCS_CMD_STARTUP;
922 cmd->initiator = initiator;
923 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
924 return lcs_send_lancmd(card, buffer, NULL);
925}
926
927/**
928 * LCS shutdown command
929 */
930static int
931lcs_send_shutdown(struct lcs_card *card)
932{
933 struct lcs_buffer *buffer;
934 struct lcs_cmd *cmd;
935
936 LCS_DBF_TEXT(2, trace, "shutdown");
937 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
938 cmd = (struct lcs_cmd *) buffer->data;
939 cmd->cmd_code = LCS_CMD_SHUTDOWN;
940 cmd->initiator = LCS_INITIATOR_TCPIP;
941 return lcs_send_lancmd(card, buffer, NULL);
942}
943
944/**
945 * LCS lanstat command
946 */
947static void
948__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
949{
950 LCS_DBF_TEXT(2, trace, "statcb");
951 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
952}
953
954static int
955lcs_send_lanstat(struct lcs_card *card)
956{
957 struct lcs_buffer *buffer;
958 struct lcs_cmd *cmd;
959
960 LCS_DBF_TEXT(2,trace, "cmdstat");
961 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
962 cmd = (struct lcs_cmd *) buffer->data;
963 /* Setup lanstat command. */
964 cmd->cmd_code = LCS_CMD_LANSTAT;
965 cmd->initiator = LCS_INITIATOR_TCPIP;
966 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
967 cmd->cmd.lcs_std_cmd.portno = card->portno;
968 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
969}
970
971/**
972 * send stoplan command
973 */
974static int
975lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
976{
977 struct lcs_buffer *buffer;
978 struct lcs_cmd *cmd;
979
980 LCS_DBF_TEXT(2, trace, "cmdstpln");
981 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
982 cmd = (struct lcs_cmd *) buffer->data;
983 cmd->cmd_code = LCS_CMD_STOPLAN;
984 cmd->initiator = initiator;
985 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
986 cmd->cmd.lcs_std_cmd.portno = card->portno;
987 return lcs_send_lancmd(card, buffer, NULL);
988}
989
990/**
991 * send startlan command
992 */
993static void
994__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
995{
996 LCS_DBF_TEXT(2, trace, "srtlancb");
997 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
998 card->portno = cmd->cmd.lcs_std_cmd.portno;
999}
1000
1001static int
1002lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1003{
1004 struct lcs_buffer *buffer;
1005 struct lcs_cmd *cmd;
1006
1007 LCS_DBF_TEXT(2, trace, "cmdstaln");
1008 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1009 cmd = (struct lcs_cmd *) buffer->data;
1010 cmd->cmd_code = LCS_CMD_STARTLAN;
1011 cmd->initiator = initiator;
1012 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1013 cmd->cmd.lcs_std_cmd.portno = card->portno;
1014 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1015}
1016
1017#ifdef CONFIG_IP_MULTICAST
1018/**
1019 * send setipm command (Multicast)
1020 */
1021static int
1022lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1023{
1024 struct lcs_buffer *buffer;
1025 struct lcs_cmd *cmd;
1026
1027 LCS_DBF_TEXT(2, trace, "cmdsetim");
1028 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1029 cmd = (struct lcs_cmd *) buffer->data;
1030 cmd->cmd_code = LCS_CMD_SETIPM;
1031 cmd->initiator = LCS_INITIATOR_TCPIP;
1032 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1033 cmd->cmd.lcs_qipassist.portno = card->portno;
1034 cmd->cmd.lcs_qipassist.version = 4;
1035 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1036 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1037 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1038 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1039 return lcs_send_lancmd(card, buffer, NULL);
1040}
1041
1042/**
1043 * send delipm command (Multicast)
1044 */
1045static int
1046lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1047{
1048 struct lcs_buffer *buffer;
1049 struct lcs_cmd *cmd;
1050
1051 LCS_DBF_TEXT(2, trace, "cmddelim");
1052 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1053 cmd = (struct lcs_cmd *) buffer->data;
1054 cmd->cmd_code = LCS_CMD_DELIPM;
1055 cmd->initiator = LCS_INITIATOR_TCPIP;
1056 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1057 cmd->cmd.lcs_qipassist.portno = card->portno;
1058 cmd->cmd.lcs_qipassist.version = 4;
1059 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1060 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1061 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1062 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1063 return lcs_send_lancmd(card, buffer, NULL);
1064}
1065
1066/**
1067 * check if multicast is supported by LCS
1068 */
1069static void
1070__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1071{
1072 LCS_DBF_TEXT(2, trace, "chkmccb");
1073 card->ip_assists_supported =
1074 cmd->cmd.lcs_qipassist.ip_assists_supported;
1075 card->ip_assists_enabled =
1076 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1077}
1078
1079static int
1080lcs_check_multicast_support(struct lcs_card *card)
1081{
1082 struct lcs_buffer *buffer;
1083 struct lcs_cmd *cmd;
1084 int rc;
1085
1086 LCS_DBF_TEXT(2, trace, "cmdqipa");
1087 /* Send query ipassist. */
1088 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1089 cmd = (struct lcs_cmd *) buffer->data;
1090 cmd->cmd_code = LCS_CMD_QIPASSIST;
1091 cmd->initiator = LCS_INITIATOR_TCPIP;
1092 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1093 cmd->cmd.lcs_qipassist.portno = card->portno;
1094 cmd->cmd.lcs_qipassist.version = 4;
1095 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1096 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1097 if (rc != 0) {
1098 PRINT_ERR("Query IPAssist failed. Assuming unsupported!\n");
1099 return -EOPNOTSUPP;
1100 }
1101 /* Print out supported assists: IPv6 */
1102 PRINT_INFO("LCS device %s %s IPv6 support\n", card->dev->name,
1103 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
1104 "with" : "without");
1105 /* Print out supported assist: Multicast */
1106 PRINT_INFO("LCS device %s %s Multicast support\n", card->dev->name,
1107 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
1108 "with" : "without");
1109 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1110 return 0;
1111 return -EOPNOTSUPP;
1112}
1113
1114/**
1115 * set or del multicast address on LCS card
1116 */
1117static void
1118lcs_fix_multicast_list(struct lcs_card *card)
1119{
1120 struct list_head failed_list;
1121 struct lcs_ipm_list *ipm, *tmp;
1122 unsigned long flags;
1123 int rc;
1124
1125 LCS_DBF_TEXT(4,trace, "fixipm");
1126 INIT_LIST_HEAD(&failed_list);
1127 spin_lock_irqsave(&card->ipm_lock, flags);
1128list_modified:
1129 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1130 switch (ipm->ipm_state) {
1131 case LCS_IPM_STATE_SET_REQUIRED:
1132 /* del from ipm_list so noone else can tamper with
1133 * this entry */
1134 list_del_init(&ipm->list);
1135 spin_unlock_irqrestore(&card->ipm_lock, flags);
1136 rc = lcs_send_setipm(card, ipm);
1137 spin_lock_irqsave(&card->ipm_lock, flags);
1138 if (rc) {
1139 PRINT_INFO("Adding multicast address failed."
1140 "Table possibly full!\n");
1141 /* store ipm in failed list -> will be added
1142 * to ipm_list again, so a retry will be done
1143 * during the next call of this function */
1144 list_add_tail(&ipm->list, &failed_list);
1145 } else {
1146 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1147 /* re-insert into ipm_list */
1148 list_add_tail(&ipm->list, &card->ipm_list);
1149 }
1150 goto list_modified;
1151 case LCS_IPM_STATE_DEL_REQUIRED:
1152 list_del(&ipm->list);
1153 spin_unlock_irqrestore(&card->ipm_lock, flags);
1154 lcs_send_delipm(card, ipm);
1155 spin_lock_irqsave(&card->ipm_lock, flags);
1156 kfree(ipm);
1157 goto list_modified;
1158 case LCS_IPM_STATE_ON_CARD:
1159 break;
1160 }
1161 }
1162 /* re-insert all entries from the failed_list into ipm_list */
1163 list_for_each_entry(ipm, &failed_list, list) {
1164 list_del_init(&ipm->list);
1165 list_add_tail(&ipm->list, &card->ipm_list);
1166 }
1167 spin_unlock_irqrestore(&card->ipm_lock, flags);
1168 if (card->state == DEV_STATE_UP)
1169 netif_wake_queue(card->dev);
1170}
1171
1172/**
1173 * get mac address for the relevant Multicast address
1174 */
1175static void
1176lcs_get_mac_for_ipm(__u32 ipm, char *mac, struct net_device *dev)
1177{
1178 LCS_DBF_TEXT(4,trace, "getmac");
1179 if (dev->type == ARPHRD_IEEE802_TR)
1180 ip_tr_mc_map(ipm, mac);
1181 else
1182 ip_eth_mc_map(ipm, mac);
1183}
1184
1185/**
1186 * function called by net device to handle multicast address relevant things
1187 */
1188static inline void
1189lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1190{
1191 struct ip_mc_list *im4;
1192 struct list_head *l;
1193 struct lcs_ipm_list *ipm;
1194 unsigned long flags;
1195 char buf[MAX_ADDR_LEN];
1196
1197 LCS_DBF_TEXT(4, trace, "remmclst");
1198 spin_lock_irqsave(&card->ipm_lock, flags);
1199 list_for_each(l, &card->ipm_list) {
1200 ipm = list_entry(l, struct lcs_ipm_list, list);
1201 for (im4 = in4_dev->mc_list; im4 != NULL; im4 = im4->next) {
1202 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1203 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1204 (memcmp(buf, &ipm->ipm.mac_addr,
1205 LCS_MAC_LENGTH) == 0) )
1206 break;
1207 }
1208 if (im4 == NULL)
1209 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1210 }
1211 spin_unlock_irqrestore(&card->ipm_lock, flags);
1212}
1213
1214static inline struct lcs_ipm_list *
1215lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1216{
1217 struct lcs_ipm_list *tmp, *ipm = NULL;
1218 struct list_head *l;
1219 unsigned long flags;
1220
1221 LCS_DBF_TEXT(4, trace, "chkmcent");
1222 spin_lock_irqsave(&card->ipm_lock, flags);
1223 list_for_each(l, &card->ipm_list) {
1224 tmp = list_entry(l, struct lcs_ipm_list, list);
1225 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1226 (memcmp(buf, &tmp->ipm.mac_addr,
1227 LCS_MAC_LENGTH) == 0) ) {
1228 ipm = tmp;
1229 break;
1230 }
1231 }
1232 spin_unlock_irqrestore(&card->ipm_lock, flags);
1233 return ipm;
1234}
1235
1236static inline void
1237lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1238{
1239
1240 struct ip_mc_list *im4;
1241 struct lcs_ipm_list *ipm;
1242 char buf[MAX_ADDR_LEN];
1243 unsigned long flags;
1244
1245 LCS_DBF_TEXT(4, trace, "setmclst");
1246 for (im4 = in4_dev->mc_list; im4; im4 = im4->next) {
1247 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1248 ipm = lcs_check_addr_entry(card, im4, buf);
1249 if (ipm != NULL)
1250 continue; /* Address already in list. */
1251 ipm = (struct lcs_ipm_list *)
1252 kmalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1253 if (ipm == NULL) {
1254 PRINT_INFO("Not enough memory to add "
1255 "new multicast entry!\n");
1256 break;
1257 }
1258 memset(ipm, 0, sizeof(struct lcs_ipm_list));
1259 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1260 ipm->ipm.ip_addr = im4->multiaddr;
1261 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1262 spin_lock_irqsave(&card->ipm_lock, flags);
1263 list_add(&ipm->list, &card->ipm_list);
1264 spin_unlock_irqrestore(&card->ipm_lock, flags);
1265 }
1266}
1267
1268static int
1269lcs_register_mc_addresses(void *data)
1270{
1271 struct lcs_card *card;
1272 struct in_device *in4_dev;
1273
1274 card = (struct lcs_card *) data;
1275 daemonize("regipm");
1276
1277 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1278 return 0;
1279 LCS_DBF_TEXT(4, trace, "regmulti");
1280
1281 in4_dev = in_dev_get(card->dev);
1282 if (in4_dev == NULL)
1283 goto out;
1284 read_lock(&in4_dev->mc_list_lock);
1285 lcs_remove_mc_addresses(card,in4_dev);
1286 lcs_set_mc_addresses(card, in4_dev);
1287 read_unlock(&in4_dev->mc_list_lock);
1288 in_dev_put(in4_dev);
1289
1290 lcs_fix_multicast_list(card);
1291out:
1292 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1293 return 0;
1294}
1295/**
1296 * function called by net device to
1297 * handle multicast address relevant things
1298 */
1299static void
1300lcs_set_multicast_list(struct net_device *dev)
1301{
1302 struct lcs_card *card;
1303
1304 LCS_DBF_TEXT(4, trace, "setmulti");
1305 card = (struct lcs_card *) dev->priv;
1306
1307 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD)) {
1308 schedule_work(&card->kernel_thread_starter);
1309 }
1310}
1311
1312#endif /* CONFIG_IP_MULTICAST */
1313
1314static long
1315lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1316{
1317 if (!IS_ERR(irb))
1318 return 0;
1319
1320 switch (PTR_ERR(irb)) {
1321 case -EIO:
1322 PRINT_WARN("i/o-error on device %s\n", cdev->dev.bus_id);
1323 LCS_DBF_TEXT(2, trace, "ckirberr");
1324 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1325 break;
1326 case -ETIMEDOUT:
1327 PRINT_WARN("timeout on device %s\n", cdev->dev.bus_id);
1328 LCS_DBF_TEXT(2, trace, "ckirberr");
1329 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1330 break;
1331 default:
1332 PRINT_WARN("unknown error %ld on device %s\n", PTR_ERR(irb),
1333 cdev->dev.bus_id);
1334 LCS_DBF_TEXT(2, trace, "ckirberr");
1335 LCS_DBF_TEXT(2, trace, " rc???");
1336 }
1337 return PTR_ERR(irb);
1338}
1339
1340
1341/**
1342 * IRQ Handler for LCS channels
1343 */
1344static void
1345lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1346{
1347 struct lcs_card *card;
1348 struct lcs_channel *channel;
1349 int index;
1350
1351 if (lcs_check_irb_error(cdev, irb))
1352 return;
1353
1354 card = CARD_FROM_DEV(cdev);
1355 if (card->read.ccwdev == cdev)
1356 channel = &card->read;
1357 else
1358 channel = &card->write;
1359
1360 LCS_DBF_TEXT_(5, trace, "Rint%s",cdev->dev.bus_id);
1361 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.cstat, irb->scsw.dstat);
1362 LCS_DBF_TEXT_(5, trace, "%4x%4x",irb->scsw.fctl, irb->scsw.actl);
1363
1364 /* How far in the ccw chain have we processed? */
1365 if ((channel->state != CH_STATE_INIT) &&
1366 (irb->scsw.fctl & SCSW_FCTL_START_FUNC)) {
1367 index = (struct ccw1 *) __va((addr_t) irb->scsw.cpa)
1368 - channel->ccws;
1369 if ((irb->scsw.actl & SCSW_ACTL_SUSPENDED) ||
1370 (irb->scsw.cstat | SCHN_STAT_PCI))
1371 /* Bloody io subsystem tells us lies about cpa... */
1372 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1373 while (channel->io_idx != index) {
1374 __lcs_processed_buffer(channel,
1375 channel->iob + channel->io_idx);
1376 channel->io_idx =
1377 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1378 }
1379 }
1380
1381 if ((irb->scsw.dstat & DEV_STAT_DEV_END) ||
1382 (irb->scsw.dstat & DEV_STAT_CHN_END) ||
1383 (irb->scsw.dstat & DEV_STAT_UNIT_CHECK))
1384 /* Mark channel as stopped. */
1385 channel->state = CH_STATE_STOPPED;
1386 else if (irb->scsw.actl & SCSW_ACTL_SUSPENDED)
1387 /* CCW execution stopped on a suspend bit. */
1388 channel->state = CH_STATE_SUSPENDED;
1389
1390 if (irb->scsw.fctl & SCSW_FCTL_HALT_FUNC) {
1391 if (irb->scsw.cc != 0) {
1392 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1393 return;
1394 }
1395 /* The channel has been stopped by halt_IO. */
1396 channel->state = CH_STATE_HALTED;
1397 }
1398
1399 if (irb->scsw.fctl & SCSW_FCTL_CLEAR_FUNC) {
1400 channel->state = CH_STATE_CLEARED;
1401 }
1402 /* Do the rest in the tasklet. */
1403 tasklet_schedule(&channel->irq_tasklet);
1404}
1405
1406/**
1407 * Tasklet for IRQ handler
1408 */
1409static void
1410lcs_tasklet(unsigned long data)
1411{
1412 unsigned long flags;
1413 struct lcs_channel *channel;
1414 struct lcs_buffer *iob;
1415 int buf_idx;
1416 int rc;
1417
1418 channel = (struct lcs_channel *) data;
1419 LCS_DBF_TEXT_(5, trace, "tlet%s",channel->ccwdev->dev.bus_id);
1420
1421 /* Check for processed buffers. */
1422 iob = channel->iob;
1423 buf_idx = channel->buf_idx;
1424 while (iob[buf_idx].state == BUF_STATE_PROCESSED) {
1425 /* Do the callback thing. */
1426 if (iob[buf_idx].callback != NULL)
1427 iob[buf_idx].callback(channel, iob + buf_idx);
1428 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1429 }
1430 channel->buf_idx = buf_idx;
1431
1432 if (channel->state == CH_STATE_STOPPED)
1433 // FIXME: what if rc != 0 ??
1434 rc = lcs_start_channel(channel);
1435 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1436 if (channel->state == CH_STATE_SUSPENDED &&
1437 channel->iob[channel->io_idx].state == BUF_STATE_READY) {
1438 // FIXME: what if rc != 0 ??
1439 rc = __lcs_resume_channel(channel);
1440 }
1441 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1442
1443 /* Something happened on the channel. Wake up waiters. */
1444 wake_up(&channel->wait_q);
1445}
1446
1447/**
1448 * Finish current tx buffer and make it ready for transmit.
1449 */
1450static void
1451__lcs_emit_txbuffer(struct lcs_card *card)
1452{
1453 LCS_DBF_TEXT(5, trace, "emittx");
1454 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1455 card->tx_buffer->count += 2;
1456 lcs_ready_buffer(&card->write, card->tx_buffer);
1457 card->tx_buffer = NULL;
1458 card->tx_emitted++;
1459}
1460
1461/**
1462 * Callback for finished tx buffers.
1463 */
1464static void
1465lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1466{
1467 struct lcs_card *card;
1468
1469 LCS_DBF_TEXT(5, trace, "txbuffcb");
1470 /* Put buffer back to pool. */
1471 lcs_release_buffer(channel, buffer);
1472 card = (struct lcs_card *)
1473 ((char *) channel - offsetof(struct lcs_card, write));
1474 spin_lock(&card->lock);
1475 card->tx_emitted--;
1476 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1477 /*
1478 * Last running tx buffer has finished. Submit partially
1479 * filled current buffer.
1480 */
1481 __lcs_emit_txbuffer(card);
1482 spin_unlock(&card->lock);
1483}
1484
1485/**
1486 * Packet transmit function called by network stack
1487 */
1488static int
1489__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1490 struct net_device *dev)
1491{
1492 struct lcs_header *header;
1493
1494 LCS_DBF_TEXT(5, trace, "hardxmit");
1495 if (skb == NULL) {
1496 card->stats.tx_dropped++;
1497 card->stats.tx_errors++;
1498 return -EIO;
1499 }
1500 if (card->state != DEV_STATE_UP) {
1501 dev_kfree_skb(skb);
1502 card->stats.tx_dropped++;
1503 card->stats.tx_errors++;
1504 card->stats.tx_carrier_errors++;
1505 return 0;
1506 }
1507 if (netif_queue_stopped(dev) ) {
1508 card->stats.tx_dropped++;
1509 return -EBUSY;
1510 }
1511 if (card->tx_buffer != NULL &&
1512 card->tx_buffer->count + sizeof(struct lcs_header) +
1513 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1514 /* skb too big for current tx buffer. */
1515 __lcs_emit_txbuffer(card);
1516 if (card->tx_buffer == NULL) {
1517 /* Get new tx buffer */
1518 card->tx_buffer = lcs_get_buffer(&card->write);
1519 if (card->tx_buffer == NULL) {
1520 card->stats.tx_dropped++;
1521 return -EBUSY;
1522 }
1523 card->tx_buffer->callback = lcs_txbuffer_cb;
1524 card->tx_buffer->count = 0;
1525 }
1526 header = (struct lcs_header *)
1527 (card->tx_buffer->data + card->tx_buffer->count);
1528 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1529 header->offset = card->tx_buffer->count;
1530 header->type = card->lan_type;
1531 header->slot = card->portno;
1532 memcpy(header + 1, skb->data, skb->len);
1533 card->stats.tx_bytes += skb->len;
1534 card->stats.tx_packets++;
1535 dev_kfree_skb(skb);
1536 if (card->tx_emitted <= 0)
1537 /* If this is the first tx buffer emit it immediately. */
1538 __lcs_emit_txbuffer(card);
1539 return 0;
1540}
1541
1542static int
1543lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1544{
1545 struct lcs_card *card;
1546 int rc;
1547
1548 LCS_DBF_TEXT(5, trace, "pktxmit");
1549 card = (struct lcs_card *) dev->priv;
1550 spin_lock(&card->lock);
1551 rc = __lcs_start_xmit(card, skb, dev);
1552 spin_unlock(&card->lock);
1553 return rc;
1554}
1555
1556/**
1557 * send startlan and lanstat command to make LCS device ready
1558 */
1559static int
1560lcs_startlan_auto(struct lcs_card *card)
1561{
1562 int rc;
1563
1564 LCS_DBF_TEXT(2, trace, "strtauto");
1565#ifdef CONFIG_NET_ETHERNET
1566 card->lan_type = LCS_FRAME_TYPE_ENET;
1567 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1568 if (rc == 0)
1569 return 0;
1570
1571#endif
1572#ifdef CONFIG_TR
1573 card->lan_type = LCS_FRAME_TYPE_TR;
1574 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1575 if (rc == 0)
1576 return 0;
1577#endif
1578#ifdef CONFIG_FDDI
1579 card->lan_type = LCS_FRAME_TYPE_FDDI;
1580 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1581 if (rc == 0)
1582 return 0;
1583#endif
1584 return -EIO;
1585}
1586
1587static int
1588lcs_startlan(struct lcs_card *card)
1589{
1590 int rc, i;
1591
1592 LCS_DBF_TEXT(2, trace, "startlan");
1593 rc = 0;
1594 if (card->portno != LCS_INVALID_PORT_NO) {
1595 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1596 rc = lcs_startlan_auto(card);
1597 else
1598 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1599 } else {
1600 for (i = 0; i <= 16; i++) {
1601 card->portno = i;
1602 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1603 rc = lcs_send_startlan(card,
1604 LCS_INITIATOR_TCPIP);
1605 else
1606 /* autodetecting lan type */
1607 rc = lcs_startlan_auto(card);
1608 if (rc == 0)
1609 break;
1610 }
1611 }
1612 if (rc == 0)
1613 return lcs_send_lanstat(card);
1614 return rc;
1615}
1616
1617/**
1618 * LCS detect function
1619 * setup channels and make them I/O ready
1620 */
1621static int
1622lcs_detect(struct lcs_card *card)
1623{
1624 int rc = 0;
1625
1626 LCS_DBF_TEXT(2, setup, "lcsdetct");
1627 /* start/reset card */
1628 if (card->dev)
1629 netif_stop_queue(card->dev);
1630 rc = lcs_stop_channels(card);
1631 if (rc == 0) {
1632 rc = lcs_start_channels(card);
1633 if (rc == 0) {
1634 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1635 if (rc == 0)
1636 rc = lcs_startlan(card);
1637 }
1638 }
1639 if (rc == 0) {
1640 card->state = DEV_STATE_UP;
1641 } else {
1642 card->state = DEV_STATE_DOWN;
1643 card->write.state = CH_STATE_INIT;
1644 card->read.state = CH_STATE_INIT;
1645 }
1646 return rc;
1647}
1648
1649/**
1650 * reset card
1651 */
1652static int
1653lcs_resetcard(struct lcs_card *card)
1654{
1655 int retries;
1656
1657 LCS_DBF_TEXT(2, trace, "rescard");
1658 for (retries = 0; retries < 10; retries++) {
1659 if (lcs_detect(card) == 0) {
1660 netif_wake_queue(card->dev);
1661 card->state = DEV_STATE_UP;
1662 PRINT_INFO("LCS device %s successfully restarted!\n",
1663 card->dev->name);
1664 return 0;
1665 }
1666 msleep(3000);
1667 }
1668 PRINT_ERR("Error in Reseting LCS card!\n");
1669 return -EIO;
1670}
1671
1672
1673/**
1674 * LCS Stop card
1675 */
1676static int
1677lcs_stopcard(struct lcs_card *card)
1678{
1679 int rc;
1680
1681 LCS_DBF_TEXT(3, setup, "stopcard");
1682
1683 if (card->read.state != CH_STATE_STOPPED &&
1684 card->write.state != CH_STATE_STOPPED &&
1685 card->state == DEV_STATE_UP) {
1686 lcs_clear_multicast_list(card);
1687 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1688 rc = lcs_send_shutdown(card);
1689 }
1690 rc = lcs_stop_channels(card);
1691 card->state = DEV_STATE_DOWN;
1692
1693 return rc;
1694}
1695
1696/**
1697 * LGW initiated commands
1698 */
1699static int
1700lcs_lgw_startlan_thread(void *data)
1701{
1702 struct lcs_card *card;
1703
1704 card = (struct lcs_card *) data;
1705 daemonize("lgwstpln");
1706
1707 if (!lcs_do_run_thread(card, LCS_STARTLAN_THREAD))
1708 return 0;
1709 LCS_DBF_TEXT(4, trace, "lgwstpln");
1710 if (card->dev)
1711 netif_stop_queue(card->dev);
1712 if (lcs_startlan(card) == 0) {
1713 netif_wake_queue(card->dev);
1714 card->state = DEV_STATE_UP;
1715 PRINT_INFO("LCS Startlan for device %s succeeded!\n",
1716 card->dev->name);
1717
1718 } else
1719 PRINT_ERR("LCS Startlan for device %s failed!\n",
1720 card->dev->name);
1721 lcs_clear_thread_running_bit(card, LCS_STARTLAN_THREAD);
1722 return 0;
1723}
1724
1725/**
1726 * Send startup command initiated by Lan Gateway
1727 */
1728static int
1729lcs_lgw_startup_thread(void *data)
1730{
1731 int rc;
1732
1733 struct lcs_card *card;
1734
1735 card = (struct lcs_card *) data;
1736 daemonize("lgwstaln");
1737
1738 if (!lcs_do_run_thread(card, LCS_STARTUP_THREAD))
1739 return 0;
1740 LCS_DBF_TEXT(4, trace, "lgwstaln");
1741 if (card->dev)
1742 netif_stop_queue(card->dev);
1743 rc = lcs_send_startup(card, LCS_INITIATOR_LGW);
1744 if (rc != 0) {
1745 PRINT_ERR("Startup for LCS device %s initiated " \
1746 "by LGW failed!\nReseting card ...\n",
1747 card->dev->name);
1748 /* do a card reset */
1749 rc = lcs_resetcard(card);
1750 if (rc == 0)
1751 goto Done;
1752 }
1753 rc = lcs_startlan(card);
1754 if (rc == 0) {
1755 netif_wake_queue(card->dev);
1756 card->state = DEV_STATE_UP;
1757 }
1758Done:
1759 if (rc == 0)
1760 PRINT_INFO("LCS Startup for device %s succeeded!\n",
1761 card->dev->name);
1762 else
1763 PRINT_ERR("LCS Startup for device %s failed!\n",
1764 card->dev->name);
1765 lcs_clear_thread_running_bit(card, LCS_STARTUP_THREAD);
1766 return 0;
1767}
1768
1769
1770/**
1771 * send stoplan command initiated by Lan Gateway
1772 */
1773static int
1774lcs_lgw_stoplan_thread(void *data)
1775{
1776 struct lcs_card *card;
1777 int rc;
1778
1779 card = (struct lcs_card *) data;
1780 daemonize("lgwstop");
1781
1782 if (!lcs_do_run_thread(card, LCS_STOPLAN_THREAD))
1783 return 0;
1784 LCS_DBF_TEXT(4, trace, "lgwstop");
1785 if (card->dev)
1786 netif_stop_queue(card->dev);
1787 if (lcs_send_stoplan(card, LCS_INITIATOR_LGW) == 0)
1788 PRINT_INFO("Stoplan for %s initiated by LGW succeeded!\n",
1789 card->dev->name);
1790 else
1791 PRINT_ERR("Stoplan %s initiated by LGW failed!\n",
1792 card->dev->name);
1793 /*Try to reset the card, stop it on failure */
1794 rc = lcs_resetcard(card);
1795 if (rc != 0)
1796 rc = lcs_stopcard(card);
1797 lcs_clear_thread_running_bit(card, LCS_STOPLAN_THREAD);
1798 return rc;
1799}
1800
1801/**
1802 * Kernel Thread helper functions for LGW initiated commands
1803 */
1804static void
1805lcs_start_kernel_thread(struct lcs_card *card)
1806{
1807 LCS_DBF_TEXT(5, trace, "krnthrd");
1808 if (lcs_do_start_thread(card, LCS_STARTUP_THREAD))
1809 kernel_thread(lcs_lgw_startup_thread, (void *) card, SIGCHLD);
1810 if (lcs_do_start_thread(card, LCS_STARTLAN_THREAD))
1811 kernel_thread(lcs_lgw_startlan_thread, (void *) card, SIGCHLD);
1812 if (lcs_do_start_thread(card, LCS_STOPLAN_THREAD))
1813 kernel_thread(lcs_lgw_stoplan_thread, (void *) card, SIGCHLD);
1814#ifdef CONFIG_IP_MULTICAST
1815 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1816 kernel_thread(lcs_register_mc_addresses, (void *) card, SIGCHLD);
1817#endif
1818}
1819
1820/**
1821 * Process control frames.
1822 */
1823static void
1824lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1825{
1826 LCS_DBF_TEXT(5, trace, "getctrl");
1827 if (cmd->initiator == LCS_INITIATOR_LGW) {
1828 switch(cmd->cmd_code) {
1829 case LCS_CMD_STARTUP:
1830 if (!lcs_set_thread_start_bit(card,
1831 LCS_STARTUP_THREAD))
1832 schedule_work(&card->kernel_thread_starter);
1833 break;
1834 case LCS_CMD_STARTLAN:
1835 if (!lcs_set_thread_start_bit(card,
1836 LCS_STARTLAN_THREAD))
1837 schedule_work(&card->kernel_thread_starter);
1838 break;
1839 case LCS_CMD_STOPLAN:
1840 if (!lcs_set_thread_start_bit(card,
1841 LCS_STOPLAN_THREAD))
1842 schedule_work(&card->kernel_thread_starter);
1843 break;
1844 default:
1845 PRINT_INFO("UNRECOGNIZED LGW COMMAND\n");
1846 break;
1847 }
1848 } else
1849 lcs_notify_lancmd_waiters(card, cmd);
1850}
1851
1852/**
1853 * Unpack network packet.
1854 */
1855static void
1856lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1857{
1858 struct sk_buff *skb;
1859
1860 LCS_DBF_TEXT(5, trace, "getskb");
1861 if (card->dev == NULL ||
1862 card->state != DEV_STATE_UP)
1863 /* The card isn't up. Ignore the packet. */
1864 return;
1865
1866 skb = dev_alloc_skb(skb_len);
1867 if (skb == NULL) {
1868 PRINT_ERR("LCS: alloc_skb failed for device=%s\n",
1869 card->dev->name);
1870 card->stats.rx_dropped++;
1871 return;
1872 }
1873 skb->dev = card->dev;
1874 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1875 skb->protocol = card->lan_type_trans(skb, card->dev);
1876 card->stats.rx_bytes += skb_len;
1877 card->stats.rx_packets++;
1878 *((__u32 *)skb->cb) = ++card->pkt_seq;
1879 netif_rx(skb);
1880}
1881
1882/**
1883 * LCS main routine to get packets and lancmd replies from the buffers
1884 */
1885static void
1886lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1887{
1888 struct lcs_card *card;
1889 struct lcs_header *lcs_hdr;
1890 __u16 offset;
1891
1892 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1893 lcs_hdr = (struct lcs_header *) buffer->data;
1894 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1895 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1896 return;
1897 }
1898 card = (struct lcs_card *)
1899 ((char *) channel - offsetof(struct lcs_card, read));
1900 offset = 0;
1901 while (lcs_hdr->offset != 0) {
1902 if (lcs_hdr->offset <= 0 ||
1903 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1904 lcs_hdr->offset < offset) {
1905 /* Offset invalid. */
1906 card->stats.rx_length_errors++;
1907 card->stats.rx_errors++;
1908 return;
1909 }
1910 /* What kind of frame is it? */
1911 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1912 /* Control frame. */
1913 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1914 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1915 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1916 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1917 /* Normal network packet. */
1918 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1919 lcs_hdr->offset - offset -
1920 sizeof(struct lcs_header));
1921 else
1922 /* Unknown frame type. */
1923 ; // FIXME: error message ?
1924 /* Proceed to next frame. */
1925 offset = lcs_hdr->offset;
1926 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1927 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1928 }
1929 /* The buffer is now empty. Make it ready again. */
1930 lcs_ready_buffer(&card->read, buffer);
1931}
1932
1933/**
1934 * get network statistics for ifconfig and other user programs
1935 */
1936static struct net_device_stats *
1937lcs_getstats(struct net_device *dev)
1938{
1939 struct lcs_card *card;
1940
1941 LCS_DBF_TEXT(4, trace, "netstats");
1942 card = (struct lcs_card *) dev->priv;
1943 return &card->stats;
1944}
1945
1946/**
1947 * stop lcs device
1948 * This function will be called by user doing ifconfig xxx down
1949 */
1950static int
1951lcs_stop_device(struct net_device *dev)
1952{
1953 struct lcs_card *card;
1954 int rc;
1955
1956 LCS_DBF_TEXT(2, trace, "stopdev");
1957 card = (struct lcs_card *) dev->priv;
1958 netif_stop_queue(dev);
1959 dev->flags &= ~IFF_UP;
1960 rc = lcs_stopcard(card);
1961 if (rc)
1962 PRINT_ERR("Try it again!\n ");
1963 return rc;
1964}
1965
1966/**
1967 * start lcs device and make it runnable
1968 * This function will be called by user doing ifconfig xxx up
1969 */
1970static int
1971lcs_open_device(struct net_device *dev)
1972{
1973 struct lcs_card *card;
1974 int rc;
1975
1976 LCS_DBF_TEXT(2, trace, "opendev");
1977 card = (struct lcs_card *) dev->priv;
1978 /* initialize statistics */
1979 rc = lcs_detect(card);
1980 if (rc) {
1981 PRINT_ERR("LCS:Error in opening device!\n");
1982
1983 } else {
1984 dev->flags |= IFF_UP;
1985 netif_wake_queue(dev);
1986 card->state = DEV_STATE_UP;
1987 }
1988 return rc;
1989}
1990
1991/**
1992 * show function for portno called by cat or similar things
1993 */
1994static ssize_t
1995lcs_portno_show (struct device *dev, char *buf)
1996{
1997 struct lcs_card *card;
1998
1999 card = (struct lcs_card *)dev->driver_data;
2000
2001 if (!card)
2002 return 0;
2003
2004 return sprintf(buf, "%d\n", card->portno);
2005}
2006
2007/**
2008 * store the value which is piped to file portno
2009 */
2010static ssize_t
2011lcs_portno_store (struct device *dev, const char *buf, size_t count)
2012{
2013 struct lcs_card *card;
2014 int value;
2015
2016 card = (struct lcs_card *)dev->driver_data;
2017
2018 if (!card)
2019 return 0;
2020
2021 sscanf(buf, "%u", &value);
2022 /* TODO: sanity checks */
2023 card->portno = value;
2024
2025 return count;
2026
2027}
2028
2029static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
2030
2031static ssize_t
2032lcs_type_show(struct device *dev, char *buf)
2033{
2034 struct ccwgroup_device *cgdev;
2035
2036 cgdev = to_ccwgroupdev(dev);
2037 if (!cgdev)
2038 return -ENODEV;
2039
2040 return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]);
2041}
2042
2043static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
2044
2045static ssize_t
2046lcs_timeout_show(struct device *dev, char *buf)
2047{
2048 struct lcs_card *card;
2049
2050 card = (struct lcs_card *)dev->driver_data;
2051
2052 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
2053}
2054
2055static ssize_t
2056lcs_timeout_store (struct device *dev, const char *buf, size_t count)
2057{
2058 struct lcs_card *card;
2059 int value;
2060
2061 card = (struct lcs_card *)dev->driver_data;
2062
2063 if (!card)
2064 return 0;
2065
2066 sscanf(buf, "%u", &value);
2067 /* TODO: sanity checks */
2068 card->lancmd_timeout = value;
2069
2070 return count;
2071
2072}
2073
2074DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2075
2076static struct attribute * lcs_attrs[] = {
2077 &dev_attr_portno.attr,
2078 &dev_attr_type.attr,
2079 &dev_attr_lancmd_timeout.attr,
2080 NULL,
2081};
2082
2083static struct attribute_group lcs_attr_group = {
2084 .attrs = lcs_attrs,
2085};
2086
2087/**
2088 * lcs_probe_device is called on establishing a new ccwgroup_device.
2089 */
2090static int
2091lcs_probe_device(struct ccwgroup_device *ccwgdev)
2092{
2093 struct lcs_card *card;
2094 int ret;
2095
2096 if (!get_device(&ccwgdev->dev))
2097 return -ENODEV;
2098
2099 LCS_DBF_TEXT(2, setup, "add_dev");
2100 card = lcs_alloc_card();
2101 if (!card) {
2102 PRINT_ERR("Allocation of lcs card failed\n");
2103 put_device(&ccwgdev->dev);
2104 return -ENOMEM;
2105 }
2106 ret = sysfs_create_group(&ccwgdev->dev.kobj, &lcs_attr_group);
2107 if (ret) {
2108 PRINT_ERR("Creating attributes failed");
2109 lcs_free_card(card);
2110 put_device(&ccwgdev->dev);
2111 return ret;
2112 }
2113 ccwgdev->dev.driver_data = card;
2114 ccwgdev->cdev[0]->handler = lcs_irq;
2115 ccwgdev->cdev[1]->handler = lcs_irq;
2116 return 0;
2117}
2118
2119static int
2120lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2121{
2122 struct lcs_card *card;
2123
2124 LCS_DBF_TEXT(2, setup, "regnetdv");
2125 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2126 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2127 return 0;
2128 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2129 return register_netdev(card->dev);
2130}
2131
2132/**
2133 * lcs_new_device will be called by setting the group device online.
2134 */
2135
2136static int
2137lcs_new_device(struct ccwgroup_device *ccwgdev)
2138{
2139 struct lcs_card *card;
2140 struct net_device *dev=NULL;
2141 enum lcs_dev_states recover_state;
2142 int rc;
2143
2144 card = (struct lcs_card *)ccwgdev->dev.driver_data;
2145 if (!card)
2146 return -ENODEV;
2147
2148 LCS_DBF_TEXT(2, setup, "newdev");
2149 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2150 card->read.ccwdev = ccwgdev->cdev[0];
2151 card->write.ccwdev = ccwgdev->cdev[1];
2152
2153 recover_state = card->state;
2154 ccw_device_set_online(card->read.ccwdev);
2155 ccw_device_set_online(card->write.ccwdev);
2156
2157 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2158
2159 lcs_setup_card(card);
2160 rc = lcs_detect(card);
2161 if (rc) {
2162 LCS_DBF_TEXT(2, setup, "dtctfail");
2163 PRINT_WARN("Detection of LCS card failed with return code "
2164 "%d (0x%x)\n", rc, rc);
2165 lcs_stopcard(card);
2166 goto out;
2167 }
2168 if (card->dev) {
2169 LCS_DBF_TEXT(2, setup, "samedev");
2170 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2171 goto netdev_out;
2172 }
2173 switch (card->lan_type) {
2174#ifdef CONFIG_NET_ETHERNET
2175 case LCS_FRAME_TYPE_ENET:
2176 card->lan_type_trans = eth_type_trans;
2177 dev = alloc_etherdev(0);
2178 break;
2179#endif
2180#ifdef CONFIG_TR
2181 case LCS_FRAME_TYPE_TR:
2182 card->lan_type_trans = tr_type_trans;
2183 dev = alloc_trdev(0);
2184 break;
2185#endif
2186#ifdef CONFIG_FDDI
2187 case LCS_FRAME_TYPE_FDDI:
2188 card->lan_type_trans = fddi_type_trans;
2189 dev = alloc_fddidev(0);
2190 break;
2191#endif
2192 default:
2193 LCS_DBF_TEXT(3, setup, "errinit");
2194 PRINT_ERR("LCS: Initialization failed\n");
2195 PRINT_ERR("LCS: No device found!\n");
2196 goto out;
2197 }
2198 if (!dev)
2199 goto out;
2200 card->dev = dev;
2201netdev_out:
2202 card->dev->priv = card;
2203 card->dev->open = lcs_open_device;
2204 card->dev->stop = lcs_stop_device;
2205 card->dev->hard_start_xmit = lcs_start_xmit;
2206 card->dev->get_stats = lcs_getstats;
2207 SET_MODULE_OWNER(dev);
2208 if (lcs_register_netdev(ccwgdev) != 0)
2209 goto out;
2210 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2211#ifdef CONFIG_IP_MULTICAST
2212 if (!lcs_check_multicast_support(card))
2213 card->dev->set_multicast_list = lcs_set_multicast_list;
2214#endif
2215 netif_stop_queue(card->dev);
2216 lcs_set_allowed_threads(card,0xffffffff);
2217 if (recover_state == DEV_STATE_RECOVER) {
2218 lcs_set_multicast_list(card->dev);
2219 card->dev->flags |= IFF_UP;
2220 netif_wake_queue(card->dev);
2221 card->state = DEV_STATE_UP;
2222 } else
2223 lcs_stopcard(card);
2224
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
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-28 13:01:26 -0500