Loading...
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Linux for S/390 Lan Channel Station Network Driver
4 *
5 * Copyright IBM Corp. 1999, 2009
6 * Author(s): Original Code written by
7 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
8 * Rewritten by
9 * Frank Pavlic <fpavlic@de.ibm.com> and
10 * Martin Schwidefsky <schwidefsky@de.ibm.com>
11 */
12
13#define KMSG_COMPONENT "lcs"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <linux/module.h>
17#include <linux/if.h>
18#include <linux/netdevice.h>
19#include <linux/etherdevice.h>
20#include <linux/fddidevice.h>
21#include <linux/inetdevice.h>
22#include <linux/in.h>
23#include <linux/igmp.h>
24#include <linux/delay.h>
25#include <linux/kthread.h>
26#include <linux/slab.h>
27#include <net/arp.h>
28#include <net/ip.h>
29
30#include <asm/debug.h>
31#include <asm/idals.h>
32#include <asm/timex.h>
33#include <linux/device.h>
34#include <asm/ccwgroup.h>
35
36#include "lcs.h"
37
38
39#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
40#error Cannot compile lcs.c without some net devices switched on.
41#endif
42
43/**
44 * initialization string for output
45 */
46
47static char version[] __initdata = "LCS driver";
48
49/**
50 * the root device for lcs group devices
51 */
52static struct device *lcs_root_dev;
53
54/**
55 * Some prototypes.
56 */
57static void lcs_tasklet(unsigned long);
58static void lcs_start_kernel_thread(struct work_struct *);
59static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
60#ifdef CONFIG_IP_MULTICAST
61static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
62#endif /* CONFIG_IP_MULTICAST */
63static int lcs_recovery(void *ptr);
64
65/**
66 * Debug Facility Stuff
67 */
68static char debug_buffer[255];
69static debug_info_t *lcs_dbf_setup;
70static debug_info_t *lcs_dbf_trace;
71
72/**
73 * LCS Debug Facility functions
74 */
75static void
76lcs_unregister_debug_facility(void)
77{
78 debug_unregister(lcs_dbf_setup);
79 debug_unregister(lcs_dbf_trace);
80}
81
82static int
83lcs_register_debug_facility(void)
84{
85 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
86 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
87 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
88 pr_err("Not enough memory for debug facility.\n");
89 lcs_unregister_debug_facility();
90 return -ENOMEM;
91 }
92 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
93 debug_set_level(lcs_dbf_setup, 2);
94 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
95 debug_set_level(lcs_dbf_trace, 2);
96 return 0;
97}
98
99/**
100 * Allocate io buffers.
101 */
102static int
103lcs_alloc_channel(struct lcs_channel *channel)
104{
105 int cnt;
106
107 LCS_DBF_TEXT(2, setup, "ichalloc");
108 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
109 /* alloc memory fo iobuffer */
110 channel->iob[cnt].data =
111 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
112 if (channel->iob[cnt].data == NULL)
113 break;
114 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
115 }
116 if (cnt < LCS_NUM_BUFFS) {
117 /* Not all io buffers could be allocated. */
118 LCS_DBF_TEXT(2, setup, "echalloc");
119 while (cnt-- > 0)
120 kfree(channel->iob[cnt].data);
121 return -ENOMEM;
122 }
123 return 0;
124}
125
126/**
127 * Free io buffers.
128 */
129static void
130lcs_free_channel(struct lcs_channel *channel)
131{
132 int cnt;
133
134 LCS_DBF_TEXT(2, setup, "ichfree");
135 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
136 kfree(channel->iob[cnt].data);
137 channel->iob[cnt].data = NULL;
138 }
139}
140
141/*
142 * Cleanup channel.
143 */
144static void
145lcs_cleanup_channel(struct lcs_channel *channel)
146{
147 LCS_DBF_TEXT(3, setup, "cleanch");
148 /* Kill write channel tasklets. */
149 tasklet_kill(&channel->irq_tasklet);
150 /* Free channel buffers. */
151 lcs_free_channel(channel);
152}
153
154/**
155 * LCS free memory for card and channels.
156 */
157static void
158lcs_free_card(struct lcs_card *card)
159{
160 LCS_DBF_TEXT(2, setup, "remcard");
161 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
162 kfree(card);
163}
164
165/**
166 * LCS alloc memory for card and channels
167 */
168static struct lcs_card *
169lcs_alloc_card(void)
170{
171 struct lcs_card *card;
172 int rc;
173
174 LCS_DBF_TEXT(2, setup, "alloclcs");
175
176 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
177 if (card == NULL)
178 return NULL;
179 card->lan_type = LCS_FRAME_TYPE_AUTO;
180 card->pkt_seq = 0;
181 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
182 /* Allocate io buffers for the read channel. */
183 rc = lcs_alloc_channel(&card->read);
184 if (rc){
185 LCS_DBF_TEXT(2, setup, "iccwerr");
186 lcs_free_card(card);
187 return NULL;
188 }
189 /* Allocate io buffers for the write channel. */
190 rc = lcs_alloc_channel(&card->write);
191 if (rc) {
192 LCS_DBF_TEXT(2, setup, "iccwerr");
193 lcs_cleanup_channel(&card->read);
194 lcs_free_card(card);
195 return NULL;
196 }
197
198#ifdef CONFIG_IP_MULTICAST
199 INIT_LIST_HEAD(&card->ipm_list);
200#endif
201 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
202 return card;
203}
204
205/*
206 * Setup read channel.
207 */
208static void
209lcs_setup_read_ccws(struct lcs_card *card)
210{
211 int cnt;
212
213 LCS_DBF_TEXT(2, setup, "ireadccw");
214 /* Setup read ccws. */
215 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
216 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
217 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
218 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
219 card->read.ccws[cnt].flags =
220 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
221 /*
222 * Note: we have allocated the buffer with GFP_DMA, so
223 * we do not need to do set_normalized_cda.
224 */
225 card->read.ccws[cnt].cda =
226 (__u32) __pa(card->read.iob[cnt].data);
227 ((struct lcs_header *)
228 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
229 card->read.iob[cnt].callback = lcs_get_frames_cb;
230 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
231 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
232 }
233 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
234 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
235 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
236 /* Last ccw is a tic (transfer in channel). */
237 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
238 card->read.ccws[LCS_NUM_BUFFS].cda =
239 (__u32) __pa(card->read.ccws);
240 /* Setg initial state of the read channel. */
241 card->read.state = LCS_CH_STATE_INIT;
242
243 card->read.io_idx = 0;
244 card->read.buf_idx = 0;
245}
246
247static void
248lcs_setup_read(struct lcs_card *card)
249{
250 LCS_DBF_TEXT(3, setup, "initread");
251
252 lcs_setup_read_ccws(card);
253 /* Initialize read channel tasklet. */
254 card->read.irq_tasklet.data = (unsigned long) &card->read;
255 card->read.irq_tasklet.func = lcs_tasklet;
256 /* Initialize waitqueue. */
257 init_waitqueue_head(&card->read.wait_q);
258}
259
260/*
261 * Setup write channel.
262 */
263static void
264lcs_setup_write_ccws(struct lcs_card *card)
265{
266 int cnt;
267
268 LCS_DBF_TEXT(3, setup, "iwritccw");
269 /* Setup write ccws. */
270 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
271 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
272 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
273 card->write.ccws[cnt].count = 0;
274 card->write.ccws[cnt].flags =
275 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
276 /*
277 * Note: we have allocated the buffer with GFP_DMA, so
278 * we do not need to do set_normalized_cda.
279 */
280 card->write.ccws[cnt].cda =
281 (__u32) __pa(card->write.iob[cnt].data);
282 }
283 /* Last ccw is a tic (transfer in channel). */
284 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
285 card->write.ccws[LCS_NUM_BUFFS].cda =
286 (__u32) __pa(card->write.ccws);
287 /* Set initial state of the write channel. */
288 card->read.state = LCS_CH_STATE_INIT;
289
290 card->write.io_idx = 0;
291 card->write.buf_idx = 0;
292}
293
294static void
295lcs_setup_write(struct lcs_card *card)
296{
297 LCS_DBF_TEXT(3, setup, "initwrit");
298
299 lcs_setup_write_ccws(card);
300 /* Initialize write channel tasklet. */
301 card->write.irq_tasklet.data = (unsigned long) &card->write;
302 card->write.irq_tasklet.func = lcs_tasklet;
303 /* Initialize waitqueue. */
304 init_waitqueue_head(&card->write.wait_q);
305}
306
307static void
308lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
309{
310 unsigned long flags;
311
312 spin_lock_irqsave(&card->mask_lock, flags);
313 card->thread_allowed_mask = threads;
314 spin_unlock_irqrestore(&card->mask_lock, flags);
315 wake_up(&card->wait_q);
316}
317static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
318{
319 unsigned long flags;
320 int rc = 0;
321
322 spin_lock_irqsave(&card->mask_lock, flags);
323 rc = (card->thread_running_mask & threads);
324 spin_unlock_irqrestore(&card->mask_lock, flags);
325 return rc;
326}
327
328static int
329lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
330{
331 return wait_event_interruptible(card->wait_q,
332 lcs_threads_running(card, threads) == 0);
333}
334
335static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
336{
337 unsigned long flags;
338
339 spin_lock_irqsave(&card->mask_lock, flags);
340 if ( !(card->thread_allowed_mask & thread) ||
341 (card->thread_start_mask & thread) ) {
342 spin_unlock_irqrestore(&card->mask_lock, flags);
343 return -EPERM;
344 }
345 card->thread_start_mask |= thread;
346 spin_unlock_irqrestore(&card->mask_lock, flags);
347 return 0;
348}
349
350static void
351lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
352{
353 unsigned long flags;
354
355 spin_lock_irqsave(&card->mask_lock, flags);
356 card->thread_running_mask &= ~thread;
357 spin_unlock_irqrestore(&card->mask_lock, flags);
358 wake_up(&card->wait_q);
359}
360
361static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
362{
363 unsigned long flags;
364 int rc = 0;
365
366 spin_lock_irqsave(&card->mask_lock, flags);
367 if (card->thread_start_mask & thread){
368 if ((card->thread_allowed_mask & thread) &&
369 !(card->thread_running_mask & thread)){
370 rc = 1;
371 card->thread_start_mask &= ~thread;
372 card->thread_running_mask |= thread;
373 } else
374 rc = -EPERM;
375 }
376 spin_unlock_irqrestore(&card->mask_lock, flags);
377 return rc;
378}
379
380static int
381lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
382{
383 int rc = 0;
384 wait_event(card->wait_q,
385 (rc = __lcs_do_run_thread(card, thread)) >= 0);
386 return rc;
387}
388
389static int
390lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
391{
392 unsigned long flags;
393 int rc = 0;
394
395 spin_lock_irqsave(&card->mask_lock, flags);
396 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
397 (u8) card->thread_start_mask,
398 (u8) card->thread_allowed_mask,
399 (u8) card->thread_running_mask);
400 rc = (card->thread_start_mask & thread);
401 spin_unlock_irqrestore(&card->mask_lock, flags);
402 return rc;
403}
404
405/**
406 * Initialize channels,card and state machines.
407 */
408static void
409lcs_setup_card(struct lcs_card *card)
410{
411 LCS_DBF_TEXT(2, setup, "initcard");
412 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
413
414 lcs_setup_read(card);
415 lcs_setup_write(card);
416 /* Set cards initial state. */
417 card->state = DEV_STATE_DOWN;
418 card->tx_buffer = NULL;
419 card->tx_emitted = 0;
420
421 init_waitqueue_head(&card->wait_q);
422 spin_lock_init(&card->lock);
423 spin_lock_init(&card->ipm_lock);
424 spin_lock_init(&card->mask_lock);
425#ifdef CONFIG_IP_MULTICAST
426 INIT_LIST_HEAD(&card->ipm_list);
427#endif
428 INIT_LIST_HEAD(&card->lancmd_waiters);
429}
430
431static void lcs_clear_multicast_list(struct lcs_card *card)
432{
433#ifdef CONFIG_IP_MULTICAST
434 struct lcs_ipm_list *ipm;
435 unsigned long flags;
436
437 /* Free multicast list. */
438 LCS_DBF_TEXT(3, setup, "clmclist");
439 spin_lock_irqsave(&card->ipm_lock, flags);
440 while (!list_empty(&card->ipm_list)){
441 ipm = list_entry(card->ipm_list.next,
442 struct lcs_ipm_list, list);
443 list_del(&ipm->list);
444 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
445 spin_unlock_irqrestore(&card->ipm_lock, flags);
446 lcs_send_delipm(card, ipm);
447 spin_lock_irqsave(&card->ipm_lock, flags);
448 }
449 kfree(ipm);
450 }
451 spin_unlock_irqrestore(&card->ipm_lock, flags);
452#endif
453}
454/**
455 * Cleanup channels,card and state machines.
456 */
457static void
458lcs_cleanup_card(struct lcs_card *card)
459{
460
461 LCS_DBF_TEXT(3, setup, "cleancrd");
462 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
463
464 if (card->dev != NULL)
465 free_netdev(card->dev);
466 /* Cleanup channels. */
467 lcs_cleanup_channel(&card->write);
468 lcs_cleanup_channel(&card->read);
469}
470
471/**
472 * Start channel.
473 */
474static int
475lcs_start_channel(struct lcs_channel *channel)
476{
477 unsigned long flags;
478 int rc;
479
480 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
481 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
482 rc = ccw_device_start(channel->ccwdev,
483 channel->ccws + channel->io_idx, 0, 0,
484 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
485 if (rc == 0)
486 channel->state = LCS_CH_STATE_RUNNING;
487 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
488 if (rc) {
489 LCS_DBF_TEXT_(4,trace,"essh%s",
490 dev_name(&channel->ccwdev->dev));
491 dev_err(&channel->ccwdev->dev,
492 "Starting an LCS device resulted in an error,"
493 " rc=%d!\n", rc);
494 }
495 return rc;
496}
497
498static int
499lcs_clear_channel(struct lcs_channel *channel)
500{
501 unsigned long flags;
502 int rc;
503
504 LCS_DBF_TEXT(4,trace,"clearch");
505 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
506 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
507 rc = ccw_device_clear(channel->ccwdev, 0);
508 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
509 if (rc) {
510 LCS_DBF_TEXT_(4, trace, "ecsc%s",
511 dev_name(&channel->ccwdev->dev));
512 return rc;
513 }
514 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
515 channel->state = LCS_CH_STATE_STOPPED;
516 return rc;
517}
518
519
520/**
521 * Stop channel.
522 */
523static int
524lcs_stop_channel(struct lcs_channel *channel)
525{
526 unsigned long flags;
527 int rc;
528
529 if (channel->state == LCS_CH_STATE_STOPPED)
530 return 0;
531 LCS_DBF_TEXT(4,trace,"haltsch");
532 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
533 channel->state = LCS_CH_STATE_INIT;
534 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
535 rc = ccw_device_halt(channel->ccwdev, 0);
536 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
537 if (rc) {
538 LCS_DBF_TEXT_(4, trace, "ehsc%s",
539 dev_name(&channel->ccwdev->dev));
540 return rc;
541 }
542 /* Asynchronous halt initialted. Wait for its completion. */
543 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
544 lcs_clear_channel(channel);
545 return 0;
546}
547
548/**
549 * start read and write channel
550 */
551static int
552lcs_start_channels(struct lcs_card *card)
553{
554 int rc;
555
556 LCS_DBF_TEXT(2, trace, "chstart");
557 /* start read channel */
558 rc = lcs_start_channel(&card->read);
559 if (rc)
560 return rc;
561 /* start write channel */
562 rc = lcs_start_channel(&card->write);
563 if (rc)
564 lcs_stop_channel(&card->read);
565 return rc;
566}
567
568/**
569 * stop read and write channel
570 */
571static int
572lcs_stop_channels(struct lcs_card *card)
573{
574 LCS_DBF_TEXT(2, trace, "chhalt");
575 lcs_stop_channel(&card->read);
576 lcs_stop_channel(&card->write);
577 return 0;
578}
579
580/**
581 * Get empty buffer.
582 */
583static struct lcs_buffer *
584__lcs_get_buffer(struct lcs_channel *channel)
585{
586 int index;
587
588 LCS_DBF_TEXT(5, trace, "_getbuff");
589 index = channel->io_idx;
590 do {
591 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
592 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
593 return channel->iob + index;
594 }
595 index = (index + 1) & (LCS_NUM_BUFFS - 1);
596 } while (index != channel->io_idx);
597 return NULL;
598}
599
600static struct lcs_buffer *
601lcs_get_buffer(struct lcs_channel *channel)
602{
603 struct lcs_buffer *buffer;
604 unsigned long flags;
605
606 LCS_DBF_TEXT(5, trace, "getbuff");
607 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
608 buffer = __lcs_get_buffer(channel);
609 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
610 return buffer;
611}
612
613/**
614 * Resume channel program if the channel is suspended.
615 */
616static int
617__lcs_resume_channel(struct lcs_channel *channel)
618{
619 int rc;
620
621 if (channel->state != LCS_CH_STATE_SUSPENDED)
622 return 0;
623 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
624 return 0;
625 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
626 rc = ccw_device_resume(channel->ccwdev);
627 if (rc) {
628 LCS_DBF_TEXT_(4, trace, "ersc%s",
629 dev_name(&channel->ccwdev->dev));
630 dev_err(&channel->ccwdev->dev,
631 "Sending data from the LCS device to the LAN failed"
632 " with rc=%d\n",rc);
633 } else
634 channel->state = LCS_CH_STATE_RUNNING;
635 return rc;
636
637}
638
639/**
640 * Make a buffer ready for processing.
641 */
642static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
643{
644 int prev, next;
645
646 LCS_DBF_TEXT(5, trace, "rdybits");
647 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
648 next = (index + 1) & (LCS_NUM_BUFFS - 1);
649 /* Check if we may clear the suspend bit of this buffer. */
650 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
651 /* Check if we have to set the PCI bit. */
652 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
653 /* Suspend bit of the previous buffer is not set. */
654 channel->ccws[index].flags |= CCW_FLAG_PCI;
655 /* Suspend bit of the next buffer is set. */
656 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
657 }
658}
659
660static int
661lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
662{
663 unsigned long flags;
664 int index, rc;
665
666 LCS_DBF_TEXT(5, trace, "rdybuff");
667 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
668 buffer->state != LCS_BUF_STATE_PROCESSED);
669 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
670 buffer->state = LCS_BUF_STATE_READY;
671 index = buffer - channel->iob;
672 /* Set length. */
673 channel->ccws[index].count = buffer->count;
674 /* Check relevant PCI/suspend bits. */
675 __lcs_ready_buffer_bits(channel, index);
676 rc = __lcs_resume_channel(channel);
677 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
678 return rc;
679}
680
681/**
682 * Mark the buffer as processed. Take care of the suspend bit
683 * of the previous buffer. This function is called from
684 * interrupt context, so the lock must not be taken.
685 */
686static int
687__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
688{
689 int index, prev, next;
690
691 LCS_DBF_TEXT(5, trace, "prcsbuff");
692 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
693 buffer->state = LCS_BUF_STATE_PROCESSED;
694 index = buffer - channel->iob;
695 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
696 next = (index + 1) & (LCS_NUM_BUFFS - 1);
697 /* Set the suspend bit and clear the PCI bit of this buffer. */
698 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
699 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
700 /* Check the suspend bit of the previous buffer. */
701 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
702 /*
703 * Previous buffer is in state ready. It might have
704 * happened in lcs_ready_buffer that the suspend bit
705 * has not been cleared to avoid an endless loop.
706 * Do it now.
707 */
708 __lcs_ready_buffer_bits(channel, prev);
709 }
710 /* Clear PCI bit of next buffer. */
711 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
712 return __lcs_resume_channel(channel);
713}
714
715/**
716 * Put a processed buffer back to state empty.
717 */
718static void
719lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
720{
721 unsigned long flags;
722
723 LCS_DBF_TEXT(5, trace, "relbuff");
724 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
725 buffer->state != LCS_BUF_STATE_PROCESSED);
726 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
727 buffer->state = LCS_BUF_STATE_EMPTY;
728 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
729}
730
731/**
732 * Get buffer for a lan command.
733 */
734static struct lcs_buffer *
735lcs_get_lancmd(struct lcs_card *card, int count)
736{
737 struct lcs_buffer *buffer;
738 struct lcs_cmd *cmd;
739
740 LCS_DBF_TEXT(4, trace, "getlncmd");
741 /* Get buffer and wait if none is available. */
742 wait_event(card->write.wait_q,
743 ((buffer = lcs_get_buffer(&card->write)) != NULL));
744 count += sizeof(struct lcs_header);
745 *(__u16 *)(buffer->data + count) = 0;
746 buffer->count = count + sizeof(__u16);
747 buffer->callback = lcs_release_buffer;
748 cmd = (struct lcs_cmd *) buffer->data;
749 cmd->offset = count;
750 cmd->type = LCS_FRAME_TYPE_CONTROL;
751 cmd->slot = 0;
752 return buffer;
753}
754
755
756static void
757lcs_get_reply(struct lcs_reply *reply)
758{
759 refcount_inc(&reply->refcnt);
760}
761
762static void
763lcs_put_reply(struct lcs_reply *reply)
764{
765 if (refcount_dec_and_test(&reply->refcnt))
766 kfree(reply);
767}
768
769static struct lcs_reply *
770lcs_alloc_reply(struct lcs_cmd *cmd)
771{
772 struct lcs_reply *reply;
773
774 LCS_DBF_TEXT(4, trace, "getreply");
775
776 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
777 if (!reply)
778 return NULL;
779 refcount_set(&reply->refcnt, 1);
780 reply->sequence_no = cmd->sequence_no;
781 reply->received = 0;
782 reply->rc = 0;
783 init_waitqueue_head(&reply->wait_q);
784
785 return reply;
786}
787
788/**
789 * Notifier function for lancmd replies. Called from read irq.
790 */
791static void
792lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
793{
794 struct list_head *l, *n;
795 struct lcs_reply *reply;
796
797 LCS_DBF_TEXT(4, trace, "notiwait");
798 spin_lock(&card->lock);
799 list_for_each_safe(l, n, &card->lancmd_waiters) {
800 reply = list_entry(l, struct lcs_reply, list);
801 if (reply->sequence_no == cmd->sequence_no) {
802 lcs_get_reply(reply);
803 list_del_init(&reply->list);
804 if (reply->callback != NULL)
805 reply->callback(card, cmd);
806 reply->received = 1;
807 reply->rc = cmd->return_code;
808 wake_up(&reply->wait_q);
809 lcs_put_reply(reply);
810 break;
811 }
812 }
813 spin_unlock(&card->lock);
814}
815
816/**
817 * Emit buffer of a lan command.
818 */
819static void
820lcs_lancmd_timeout(struct timer_list *t)
821{
822 struct lcs_reply *reply = from_timer(reply, t, timer);
823 struct lcs_reply *list_reply, *r;
824 unsigned long flags;
825
826 LCS_DBF_TEXT(4, trace, "timeout");
827 spin_lock_irqsave(&reply->card->lock, flags);
828 list_for_each_entry_safe(list_reply, r,
829 &reply->card->lancmd_waiters,list) {
830 if (reply == list_reply) {
831 lcs_get_reply(reply);
832 list_del_init(&reply->list);
833 spin_unlock_irqrestore(&reply->card->lock, flags);
834 reply->received = 1;
835 reply->rc = -ETIME;
836 wake_up(&reply->wait_q);
837 lcs_put_reply(reply);
838 return;
839 }
840 }
841 spin_unlock_irqrestore(&reply->card->lock, flags);
842}
843
844static int
845lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
846 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
847{
848 struct lcs_reply *reply;
849 struct lcs_cmd *cmd;
850 unsigned long flags;
851 int rc;
852
853 LCS_DBF_TEXT(4, trace, "sendcmd");
854 cmd = (struct lcs_cmd *) buffer->data;
855 cmd->return_code = 0;
856 cmd->sequence_no = card->sequence_no++;
857 reply = lcs_alloc_reply(cmd);
858 if (!reply)
859 return -ENOMEM;
860 reply->callback = reply_callback;
861 reply->card = card;
862 spin_lock_irqsave(&card->lock, flags);
863 list_add_tail(&reply->list, &card->lancmd_waiters);
864 spin_unlock_irqrestore(&card->lock, flags);
865
866 buffer->callback = lcs_release_buffer;
867 rc = lcs_ready_buffer(&card->write, buffer);
868 if (rc)
869 return rc;
870 timer_setup(&reply->timer, lcs_lancmd_timeout, 0);
871 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);
872 wait_event(reply->wait_q, reply->received);
873 del_timer_sync(&reply->timer);
874 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
875 rc = reply->rc;
876 lcs_put_reply(reply);
877 return rc ? -EIO : 0;
878}
879
880/**
881 * LCS startup command
882 */
883static int
884lcs_send_startup(struct lcs_card *card, __u8 initiator)
885{
886 struct lcs_buffer *buffer;
887 struct lcs_cmd *cmd;
888
889 LCS_DBF_TEXT(2, trace, "startup");
890 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
891 cmd = (struct lcs_cmd *) buffer->data;
892 cmd->cmd_code = LCS_CMD_STARTUP;
893 cmd->initiator = initiator;
894 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
895 return lcs_send_lancmd(card, buffer, NULL);
896}
897
898/**
899 * LCS shutdown command
900 */
901static int
902lcs_send_shutdown(struct lcs_card *card)
903{
904 struct lcs_buffer *buffer;
905 struct lcs_cmd *cmd;
906
907 LCS_DBF_TEXT(2, trace, "shutdown");
908 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
909 cmd = (struct lcs_cmd *) buffer->data;
910 cmd->cmd_code = LCS_CMD_SHUTDOWN;
911 cmd->initiator = LCS_INITIATOR_TCPIP;
912 return lcs_send_lancmd(card, buffer, NULL);
913}
914
915/**
916 * LCS lanstat command
917 */
918static void
919__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
920{
921 LCS_DBF_TEXT(2, trace, "statcb");
922 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
923}
924
925static int
926lcs_send_lanstat(struct lcs_card *card)
927{
928 struct lcs_buffer *buffer;
929 struct lcs_cmd *cmd;
930
931 LCS_DBF_TEXT(2,trace, "cmdstat");
932 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
933 cmd = (struct lcs_cmd *) buffer->data;
934 /* Setup lanstat command. */
935 cmd->cmd_code = LCS_CMD_LANSTAT;
936 cmd->initiator = LCS_INITIATOR_TCPIP;
937 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
938 cmd->cmd.lcs_std_cmd.portno = card->portno;
939 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
940}
941
942/**
943 * send stoplan command
944 */
945static int
946lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
947{
948 struct lcs_buffer *buffer;
949 struct lcs_cmd *cmd;
950
951 LCS_DBF_TEXT(2, trace, "cmdstpln");
952 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
953 cmd = (struct lcs_cmd *) buffer->data;
954 cmd->cmd_code = LCS_CMD_STOPLAN;
955 cmd->initiator = initiator;
956 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
957 cmd->cmd.lcs_std_cmd.portno = card->portno;
958 return lcs_send_lancmd(card, buffer, NULL);
959}
960
961/**
962 * send startlan command
963 */
964static void
965__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
966{
967 LCS_DBF_TEXT(2, trace, "srtlancb");
968 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
969 card->portno = cmd->cmd.lcs_std_cmd.portno;
970}
971
972static int
973lcs_send_startlan(struct lcs_card *card, __u8 initiator)
974{
975 struct lcs_buffer *buffer;
976 struct lcs_cmd *cmd;
977
978 LCS_DBF_TEXT(2, trace, "cmdstaln");
979 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
980 cmd = (struct lcs_cmd *) buffer->data;
981 cmd->cmd_code = LCS_CMD_STARTLAN;
982 cmd->initiator = initiator;
983 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
984 cmd->cmd.lcs_std_cmd.portno = card->portno;
985 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
986}
987
988#ifdef CONFIG_IP_MULTICAST
989/**
990 * send setipm command (Multicast)
991 */
992static int
993lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
994{
995 struct lcs_buffer *buffer;
996 struct lcs_cmd *cmd;
997
998 LCS_DBF_TEXT(2, trace, "cmdsetim");
999 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1000 cmd = (struct lcs_cmd *) buffer->data;
1001 cmd->cmd_code = LCS_CMD_SETIPM;
1002 cmd->initiator = LCS_INITIATOR_TCPIP;
1003 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1004 cmd->cmd.lcs_qipassist.portno = card->portno;
1005 cmd->cmd.lcs_qipassist.version = 4;
1006 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1007 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1008 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1009 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1010 return lcs_send_lancmd(card, buffer, NULL);
1011}
1012
1013/**
1014 * send delipm command (Multicast)
1015 */
1016static int
1017lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1018{
1019 struct lcs_buffer *buffer;
1020 struct lcs_cmd *cmd;
1021
1022 LCS_DBF_TEXT(2, trace, "cmddelim");
1023 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1024 cmd = (struct lcs_cmd *) buffer->data;
1025 cmd->cmd_code = LCS_CMD_DELIPM;
1026 cmd->initiator = LCS_INITIATOR_TCPIP;
1027 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1028 cmd->cmd.lcs_qipassist.portno = card->portno;
1029 cmd->cmd.lcs_qipassist.version = 4;
1030 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1031 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1032 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1033 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1034 return lcs_send_lancmd(card, buffer, NULL);
1035}
1036
1037/**
1038 * check if multicast is supported by LCS
1039 */
1040static void
1041__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1042{
1043 LCS_DBF_TEXT(2, trace, "chkmccb");
1044 card->ip_assists_supported =
1045 cmd->cmd.lcs_qipassist.ip_assists_supported;
1046 card->ip_assists_enabled =
1047 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1048}
1049
1050static int
1051lcs_check_multicast_support(struct lcs_card *card)
1052{
1053 struct lcs_buffer *buffer;
1054 struct lcs_cmd *cmd;
1055 int rc;
1056
1057 LCS_DBF_TEXT(2, trace, "cmdqipa");
1058 /* Send query ipassist. */
1059 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1060 cmd = (struct lcs_cmd *) buffer->data;
1061 cmd->cmd_code = LCS_CMD_QIPASSIST;
1062 cmd->initiator = LCS_INITIATOR_TCPIP;
1063 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1064 cmd->cmd.lcs_qipassist.portno = card->portno;
1065 cmd->cmd.lcs_qipassist.version = 4;
1066 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1067 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1068 if (rc != 0) {
1069 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1070 return -EOPNOTSUPP;
1071 }
1072 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1073 return 0;
1074 return -EOPNOTSUPP;
1075}
1076
1077/**
1078 * set or del multicast address on LCS card
1079 */
1080static void
1081lcs_fix_multicast_list(struct lcs_card *card)
1082{
1083 struct list_head failed_list;
1084 struct lcs_ipm_list *ipm, *tmp;
1085 unsigned long flags;
1086 int rc;
1087
1088 LCS_DBF_TEXT(4,trace, "fixipm");
1089 INIT_LIST_HEAD(&failed_list);
1090 spin_lock_irqsave(&card->ipm_lock, flags);
1091list_modified:
1092 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1093 switch (ipm->ipm_state) {
1094 case LCS_IPM_STATE_SET_REQUIRED:
1095 /* del from ipm_list so no one else can tamper with
1096 * this entry */
1097 list_del_init(&ipm->list);
1098 spin_unlock_irqrestore(&card->ipm_lock, flags);
1099 rc = lcs_send_setipm(card, ipm);
1100 spin_lock_irqsave(&card->ipm_lock, flags);
1101 if (rc) {
1102 pr_info("Adding multicast address failed."
1103 " Table possibly full!\n");
1104 /* store ipm in failed list -> will be added
1105 * to ipm_list again, so a retry will be done
1106 * during the next call of this function */
1107 list_add_tail(&ipm->list, &failed_list);
1108 } else {
1109 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1110 /* re-insert into ipm_list */
1111 list_add_tail(&ipm->list, &card->ipm_list);
1112 }
1113 goto list_modified;
1114 case LCS_IPM_STATE_DEL_REQUIRED:
1115 list_del(&ipm->list);
1116 spin_unlock_irqrestore(&card->ipm_lock, flags);
1117 lcs_send_delipm(card, ipm);
1118 spin_lock_irqsave(&card->ipm_lock, flags);
1119 kfree(ipm);
1120 goto list_modified;
1121 case LCS_IPM_STATE_ON_CARD:
1122 break;
1123 }
1124 }
1125 /* re-insert all entries from the failed_list into ipm_list */
1126 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1127 list_move_tail(&ipm->list, &card->ipm_list);
1128
1129 spin_unlock_irqrestore(&card->ipm_lock, flags);
1130}
1131
1132/**
1133 * get mac address for the relevant Multicast address
1134 */
1135static void
1136lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1137{
1138 LCS_DBF_TEXT(4,trace, "getmac");
1139 ip_eth_mc_map(ipm, mac);
1140}
1141
1142/**
1143 * function called by net device to handle multicast address relevant things
1144 */
1145static void lcs_remove_mc_addresses(struct lcs_card *card,
1146 struct in_device *in4_dev)
1147{
1148 struct ip_mc_list *im4;
1149 struct list_head *l;
1150 struct lcs_ipm_list *ipm;
1151 unsigned long flags;
1152 char buf[MAX_ADDR_LEN];
1153
1154 LCS_DBF_TEXT(4, trace, "remmclst");
1155 spin_lock_irqsave(&card->ipm_lock, flags);
1156 list_for_each(l, &card->ipm_list) {
1157 ipm = list_entry(l, struct lcs_ipm_list, list);
1158 for (im4 = rcu_dereference(in4_dev->mc_list);
1159 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1160 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1161 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1162 (memcmp(buf, &ipm->ipm.mac_addr,
1163 LCS_MAC_LENGTH) == 0) )
1164 break;
1165 }
1166 if (im4 == NULL)
1167 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1168 }
1169 spin_unlock_irqrestore(&card->ipm_lock, flags);
1170}
1171
1172static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
1173 struct ip_mc_list *im4,
1174 char *buf)
1175{
1176 struct lcs_ipm_list *tmp, *ipm = NULL;
1177 struct list_head *l;
1178 unsigned long flags;
1179
1180 LCS_DBF_TEXT(4, trace, "chkmcent");
1181 spin_lock_irqsave(&card->ipm_lock, flags);
1182 list_for_each(l, &card->ipm_list) {
1183 tmp = list_entry(l, struct lcs_ipm_list, list);
1184 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1185 (memcmp(buf, &tmp->ipm.mac_addr,
1186 LCS_MAC_LENGTH) == 0) ) {
1187 ipm = tmp;
1188 break;
1189 }
1190 }
1191 spin_unlock_irqrestore(&card->ipm_lock, flags);
1192 return ipm;
1193}
1194
1195static void lcs_set_mc_addresses(struct lcs_card *card,
1196 struct in_device *in4_dev)
1197{
1198
1199 struct ip_mc_list *im4;
1200 struct lcs_ipm_list *ipm;
1201 char buf[MAX_ADDR_LEN];
1202 unsigned long flags;
1203
1204 LCS_DBF_TEXT(4, trace, "setmclst");
1205 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1206 im4 = rcu_dereference(im4->next_rcu)) {
1207 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1208 ipm = lcs_check_addr_entry(card, im4, buf);
1209 if (ipm != NULL)
1210 continue; /* Address already in list. */
1211 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1212 if (ipm == NULL) {
1213 pr_info("Not enough memory to add"
1214 " new multicast entry!\n");
1215 break;
1216 }
1217 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1218 ipm->ipm.ip_addr = im4->multiaddr;
1219 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1220 spin_lock_irqsave(&card->ipm_lock, flags);
1221 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1222 list_add(&ipm->list, &card->ipm_list);
1223 spin_unlock_irqrestore(&card->ipm_lock, flags);
1224 }
1225}
1226
1227static int
1228lcs_register_mc_addresses(void *data)
1229{
1230 struct lcs_card *card;
1231 struct in_device *in4_dev;
1232
1233 card = (struct lcs_card *) data;
1234
1235 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1236 return 0;
1237 LCS_DBF_TEXT(4, trace, "regmulti");
1238
1239 in4_dev = in_dev_get(card->dev);
1240 if (in4_dev == NULL)
1241 goto out;
1242 rcu_read_lock();
1243 lcs_remove_mc_addresses(card,in4_dev);
1244 lcs_set_mc_addresses(card, in4_dev);
1245 rcu_read_unlock();
1246 in_dev_put(in4_dev);
1247
1248 netif_carrier_off(card->dev);
1249 netif_tx_disable(card->dev);
1250 wait_event(card->write.wait_q,
1251 (card->write.state != LCS_CH_STATE_RUNNING));
1252 lcs_fix_multicast_list(card);
1253 if (card->state == DEV_STATE_UP) {
1254 netif_carrier_on(card->dev);
1255 netif_wake_queue(card->dev);
1256 }
1257out:
1258 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1259 return 0;
1260}
1261#endif /* CONFIG_IP_MULTICAST */
1262
1263/**
1264 * function called by net device to
1265 * handle multicast address relevant things
1266 */
1267static void
1268lcs_set_multicast_list(struct net_device *dev)
1269{
1270#ifdef CONFIG_IP_MULTICAST
1271 struct lcs_card *card;
1272
1273 LCS_DBF_TEXT(4, trace, "setmulti");
1274 card = (struct lcs_card *) dev->ml_priv;
1275
1276 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1277 schedule_work(&card->kernel_thread_starter);
1278#endif /* CONFIG_IP_MULTICAST */
1279}
1280
1281static long
1282lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1283{
1284 if (!IS_ERR(irb))
1285 return 0;
1286
1287 switch (PTR_ERR(irb)) {
1288 case -EIO:
1289 dev_warn(&cdev->dev,
1290 "An I/O-error occurred on the LCS device\n");
1291 LCS_DBF_TEXT(2, trace, "ckirberr");
1292 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1293 break;
1294 case -ETIMEDOUT:
1295 dev_warn(&cdev->dev,
1296 "A command timed out on the LCS device\n");
1297 LCS_DBF_TEXT(2, trace, "ckirberr");
1298 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1299 break;
1300 default:
1301 dev_warn(&cdev->dev,
1302 "An error occurred on the LCS device, rc=%ld\n",
1303 PTR_ERR(irb));
1304 LCS_DBF_TEXT(2, trace, "ckirberr");
1305 LCS_DBF_TEXT(2, trace, " rc???");
1306 }
1307 return PTR_ERR(irb);
1308}
1309
1310static int
1311lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1312{
1313 int dstat, cstat;
1314 char *sense;
1315
1316 sense = (char *) irb->ecw;
1317 cstat = irb->scsw.cmd.cstat;
1318 dstat = irb->scsw.cmd.dstat;
1319
1320 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1321 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1322 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1323 LCS_DBF_TEXT(2, trace, "CGENCHK");
1324 return 1;
1325 }
1326 if (dstat & DEV_STAT_UNIT_CHECK) {
1327 if (sense[LCS_SENSE_BYTE_1] &
1328 LCS_SENSE_RESETTING_EVENT) {
1329 LCS_DBF_TEXT(2, trace, "REVIND");
1330 return 1;
1331 }
1332 if (sense[LCS_SENSE_BYTE_0] &
1333 LCS_SENSE_CMD_REJECT) {
1334 LCS_DBF_TEXT(2, trace, "CMDREJ");
1335 return 0;
1336 }
1337 if ((!sense[LCS_SENSE_BYTE_0]) &&
1338 (!sense[LCS_SENSE_BYTE_1]) &&
1339 (!sense[LCS_SENSE_BYTE_2]) &&
1340 (!sense[LCS_SENSE_BYTE_3])) {
1341 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1342 return 0;
1343 }
1344 LCS_DBF_TEXT(2, trace, "DGENCHK");
1345 return 1;
1346 }
1347 return 0;
1348}
1349
1350static void
1351lcs_schedule_recovery(struct lcs_card *card)
1352{
1353 LCS_DBF_TEXT(2, trace, "startrec");
1354 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1355 schedule_work(&card->kernel_thread_starter);
1356}
1357
1358/**
1359 * IRQ Handler for LCS channels
1360 */
1361static void
1362lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1363{
1364 struct lcs_card *card;
1365 struct lcs_channel *channel;
1366 int rc, index;
1367 int cstat, dstat;
1368
1369 if (lcs_check_irb_error(cdev, irb))
1370 return;
1371
1372 card = CARD_FROM_DEV(cdev);
1373 if (card->read.ccwdev == cdev)
1374 channel = &card->read;
1375 else
1376 channel = &card->write;
1377
1378 cstat = irb->scsw.cmd.cstat;
1379 dstat = irb->scsw.cmd.dstat;
1380 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1381 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1382 irb->scsw.cmd.dstat);
1383 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1384 irb->scsw.cmd.actl);
1385
1386 /* Check for channel and device errors presented */
1387 rc = lcs_get_problem(cdev, irb);
1388 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1389 dev_warn(&cdev->dev,
1390 "The LCS device stopped because of an error,"
1391 " dstat=0x%X, cstat=0x%X \n",
1392 dstat, cstat);
1393 if (rc) {
1394 channel->state = LCS_CH_STATE_ERROR;
1395 }
1396 }
1397 if (channel->state == LCS_CH_STATE_ERROR) {
1398 lcs_schedule_recovery(card);
1399 wake_up(&card->wait_q);
1400 return;
1401 }
1402 /* How far in the ccw chain have we processed? */
1403 if ((channel->state != LCS_CH_STATE_INIT) &&
1404 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1405 (irb->scsw.cmd.cpa != 0)) {
1406 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1407 - channel->ccws;
1408 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1409 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1410 /* Bloody io subsystem tells us lies about cpa... */
1411 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1412 while (channel->io_idx != index) {
1413 __lcs_processed_buffer(channel,
1414 channel->iob + channel->io_idx);
1415 channel->io_idx =
1416 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1417 }
1418 }
1419
1420 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1421 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1422 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1423 /* Mark channel as stopped. */
1424 channel->state = LCS_CH_STATE_STOPPED;
1425 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1426 /* CCW execution stopped on a suspend bit. */
1427 channel->state = LCS_CH_STATE_SUSPENDED;
1428 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1429 if (irb->scsw.cmd.cc != 0) {
1430 ccw_device_halt(channel->ccwdev, 0);
1431 return;
1432 }
1433 /* The channel has been stopped by halt_IO. */
1434 channel->state = LCS_CH_STATE_HALTED;
1435 }
1436 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1437 channel->state = LCS_CH_STATE_CLEARED;
1438 /* Do the rest in the tasklet. */
1439 tasklet_schedule(&channel->irq_tasklet);
1440}
1441
1442/**
1443 * Tasklet for IRQ handler
1444 */
1445static void
1446lcs_tasklet(unsigned long data)
1447{
1448 unsigned long flags;
1449 struct lcs_channel *channel;
1450 struct lcs_buffer *iob;
1451 int buf_idx;
1452
1453 channel = (struct lcs_channel *) data;
1454 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1455
1456 /* Check for processed buffers. */
1457 iob = channel->iob;
1458 buf_idx = channel->buf_idx;
1459 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1460 /* Do the callback thing. */
1461 if (iob[buf_idx].callback != NULL)
1462 iob[buf_idx].callback(channel, iob + buf_idx);
1463 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1464 }
1465 channel->buf_idx = buf_idx;
1466
1467 if (channel->state == LCS_CH_STATE_STOPPED)
1468 lcs_start_channel(channel);
1469 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1470 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1471 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1472 __lcs_resume_channel(channel);
1473 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1474
1475 /* Something happened on the channel. Wake up waiters. */
1476 wake_up(&channel->wait_q);
1477}
1478
1479/**
1480 * Finish current tx buffer and make it ready for transmit.
1481 */
1482static void
1483__lcs_emit_txbuffer(struct lcs_card *card)
1484{
1485 LCS_DBF_TEXT(5, trace, "emittx");
1486 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1487 card->tx_buffer->count += 2;
1488 lcs_ready_buffer(&card->write, card->tx_buffer);
1489 card->tx_buffer = NULL;
1490 card->tx_emitted++;
1491}
1492
1493/**
1494 * Callback for finished tx buffers.
1495 */
1496static void
1497lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1498{
1499 struct lcs_card *card;
1500
1501 LCS_DBF_TEXT(5, trace, "txbuffcb");
1502 /* Put buffer back to pool. */
1503 lcs_release_buffer(channel, buffer);
1504 card = container_of(channel, struct lcs_card, write);
1505 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1506 netif_wake_queue(card->dev);
1507 spin_lock(&card->lock);
1508 card->tx_emitted--;
1509 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1510 /*
1511 * Last running tx buffer has finished. Submit partially
1512 * filled current buffer.
1513 */
1514 __lcs_emit_txbuffer(card);
1515 spin_unlock(&card->lock);
1516}
1517
1518/**
1519 * Packet transmit function called by network stack
1520 */
1521static int
1522__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1523 struct net_device *dev)
1524{
1525 struct lcs_header *header;
1526 int rc = NETDEV_TX_OK;
1527
1528 LCS_DBF_TEXT(5, trace, "hardxmit");
1529 if (skb == NULL) {
1530 card->stats.tx_dropped++;
1531 card->stats.tx_errors++;
1532 return NETDEV_TX_OK;
1533 }
1534 if (card->state != DEV_STATE_UP) {
1535 dev_kfree_skb(skb);
1536 card->stats.tx_dropped++;
1537 card->stats.tx_errors++;
1538 card->stats.tx_carrier_errors++;
1539 return NETDEV_TX_OK;
1540 }
1541 if (skb->protocol == htons(ETH_P_IPV6)) {
1542 dev_kfree_skb(skb);
1543 return NETDEV_TX_OK;
1544 }
1545 netif_stop_queue(card->dev);
1546 spin_lock(&card->lock);
1547 if (card->tx_buffer != NULL &&
1548 card->tx_buffer->count + sizeof(struct lcs_header) +
1549 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1550 /* skb too big for current tx buffer. */
1551 __lcs_emit_txbuffer(card);
1552 if (card->tx_buffer == NULL) {
1553 /* Get new tx buffer */
1554 card->tx_buffer = lcs_get_buffer(&card->write);
1555 if (card->tx_buffer == NULL) {
1556 card->stats.tx_dropped++;
1557 rc = NETDEV_TX_BUSY;
1558 goto out;
1559 }
1560 card->tx_buffer->callback = lcs_txbuffer_cb;
1561 card->tx_buffer->count = 0;
1562 }
1563 header = (struct lcs_header *)
1564 (card->tx_buffer->data + card->tx_buffer->count);
1565 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1566 header->offset = card->tx_buffer->count;
1567 header->type = card->lan_type;
1568 header->slot = card->portno;
1569 skb_copy_from_linear_data(skb, header + 1, skb->len);
1570 spin_unlock(&card->lock);
1571 card->stats.tx_bytes += skb->len;
1572 card->stats.tx_packets++;
1573 dev_kfree_skb(skb);
1574 netif_wake_queue(card->dev);
1575 spin_lock(&card->lock);
1576 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1577 /* If this is the first tx buffer emit it immediately. */
1578 __lcs_emit_txbuffer(card);
1579out:
1580 spin_unlock(&card->lock);
1581 return rc;
1582}
1583
1584static int
1585lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1586{
1587 struct lcs_card *card;
1588 int rc;
1589
1590 LCS_DBF_TEXT(5, trace, "pktxmit");
1591 card = (struct lcs_card *) dev->ml_priv;
1592 rc = __lcs_start_xmit(card, skb, dev);
1593 return rc;
1594}
1595
1596/**
1597 * send startlan and lanstat command to make LCS device ready
1598 */
1599static int
1600lcs_startlan_auto(struct lcs_card *card)
1601{
1602 int rc;
1603
1604 LCS_DBF_TEXT(2, trace, "strtauto");
1605#ifdef CONFIG_ETHERNET
1606 card->lan_type = LCS_FRAME_TYPE_ENET;
1607 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1608 if (rc == 0)
1609 return 0;
1610
1611#endif
1612#ifdef CONFIG_FDDI
1613 card->lan_type = LCS_FRAME_TYPE_FDDI;
1614 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1615 if (rc == 0)
1616 return 0;
1617#endif
1618 return -EIO;
1619}
1620
1621static int
1622lcs_startlan(struct lcs_card *card)
1623{
1624 int rc, i;
1625
1626 LCS_DBF_TEXT(2, trace, "startlan");
1627 rc = 0;
1628 if (card->portno != LCS_INVALID_PORT_NO) {
1629 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1630 rc = lcs_startlan_auto(card);
1631 else
1632 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1633 } else {
1634 for (i = 0; i <= 16; i++) {
1635 card->portno = i;
1636 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1637 rc = lcs_send_startlan(card,
1638 LCS_INITIATOR_TCPIP);
1639 else
1640 /* autodetecting lan type */
1641 rc = lcs_startlan_auto(card);
1642 if (rc == 0)
1643 break;
1644 }
1645 }
1646 if (rc == 0)
1647 return lcs_send_lanstat(card);
1648 return rc;
1649}
1650
1651/**
1652 * LCS detect function
1653 * setup channels and make them I/O ready
1654 */
1655static int
1656lcs_detect(struct lcs_card *card)
1657{
1658 int rc = 0;
1659
1660 LCS_DBF_TEXT(2, setup, "lcsdetct");
1661 /* start/reset card */
1662 if (card->dev)
1663 netif_stop_queue(card->dev);
1664 rc = lcs_stop_channels(card);
1665 if (rc == 0) {
1666 rc = lcs_start_channels(card);
1667 if (rc == 0) {
1668 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1669 if (rc == 0)
1670 rc = lcs_startlan(card);
1671 }
1672 }
1673 if (rc == 0) {
1674 card->state = DEV_STATE_UP;
1675 } else {
1676 card->state = DEV_STATE_DOWN;
1677 card->write.state = LCS_CH_STATE_INIT;
1678 card->read.state = LCS_CH_STATE_INIT;
1679 }
1680 return rc;
1681}
1682
1683/**
1684 * LCS Stop card
1685 */
1686static int
1687lcs_stopcard(struct lcs_card *card)
1688{
1689 int rc;
1690
1691 LCS_DBF_TEXT(3, setup, "stopcard");
1692
1693 if (card->read.state != LCS_CH_STATE_STOPPED &&
1694 card->write.state != LCS_CH_STATE_STOPPED &&
1695 card->read.state != LCS_CH_STATE_ERROR &&
1696 card->write.state != LCS_CH_STATE_ERROR &&
1697 card->state == DEV_STATE_UP) {
1698 lcs_clear_multicast_list(card);
1699 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1700 rc = lcs_send_shutdown(card);
1701 }
1702 rc = lcs_stop_channels(card);
1703 card->state = DEV_STATE_DOWN;
1704
1705 return rc;
1706}
1707
1708/**
1709 * Kernel Thread helper functions for LGW initiated commands
1710 */
1711static void
1712lcs_start_kernel_thread(struct work_struct *work)
1713{
1714 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1715 LCS_DBF_TEXT(5, trace, "krnthrd");
1716 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1717 kthread_run(lcs_recovery, card, "lcs_recover");
1718#ifdef CONFIG_IP_MULTICAST
1719 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1720 kthread_run(lcs_register_mc_addresses, card, "regipm");
1721#endif
1722}
1723
1724/**
1725 * Process control frames.
1726 */
1727static void
1728lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1729{
1730 LCS_DBF_TEXT(5, trace, "getctrl");
1731 if (cmd->initiator == LCS_INITIATOR_LGW) {
1732 switch(cmd->cmd_code) {
1733 case LCS_CMD_STARTUP:
1734 case LCS_CMD_STARTLAN:
1735 lcs_schedule_recovery(card);
1736 break;
1737 case LCS_CMD_STOPLAN:
1738 pr_warn("Stoplan for %s initiated by LGW\n",
1739 card->dev->name);
1740 if (card->dev)
1741 netif_carrier_off(card->dev);
1742 break;
1743 default:
1744 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1745 break;
1746 }
1747 } else
1748 lcs_notify_lancmd_waiters(card, cmd);
1749}
1750
1751/**
1752 * Unpack network packet.
1753 */
1754static void
1755lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1756{
1757 struct sk_buff *skb;
1758
1759 LCS_DBF_TEXT(5, trace, "getskb");
1760 if (card->dev == NULL ||
1761 card->state != DEV_STATE_UP)
1762 /* The card isn't up. Ignore the packet. */
1763 return;
1764
1765 skb = dev_alloc_skb(skb_len);
1766 if (skb == NULL) {
1767 dev_err(&card->dev->dev,
1768 " Allocating a socket buffer to interface %s failed\n",
1769 card->dev->name);
1770 card->stats.rx_dropped++;
1771 return;
1772 }
1773 skb_put_data(skb, skb_data, skb_len);
1774 skb->protocol = card->lan_type_trans(skb, card->dev);
1775 card->stats.rx_bytes += skb_len;
1776 card->stats.rx_packets++;
1777 if (skb->protocol == htons(ETH_P_802_2))
1778 *((__u32 *)skb->cb) = ++card->pkt_seq;
1779 netif_rx(skb);
1780}
1781
1782/**
1783 * LCS main routine to get packets and lancmd replies from the buffers
1784 */
1785static void
1786lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1787{
1788 struct lcs_card *card;
1789 struct lcs_header *lcs_hdr;
1790 __u16 offset;
1791
1792 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1793 lcs_hdr = (struct lcs_header *) buffer->data;
1794 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1795 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1796 return;
1797 }
1798 card = container_of(channel, struct lcs_card, read);
1799 offset = 0;
1800 while (lcs_hdr->offset != 0) {
1801 if (lcs_hdr->offset <= 0 ||
1802 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1803 lcs_hdr->offset < offset) {
1804 /* Offset invalid. */
1805 card->stats.rx_length_errors++;
1806 card->stats.rx_errors++;
1807 return;
1808 }
1809 /* What kind of frame is it? */
1810 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1811 /* Control frame. */
1812 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1813 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1814 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1815 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1816 /* Normal network packet. */
1817 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1818 lcs_hdr->offset - offset -
1819 sizeof(struct lcs_header));
1820 else
1821 /* Unknown frame type. */
1822 ; // FIXME: error message ?
1823 /* Proceed to next frame. */
1824 offset = lcs_hdr->offset;
1825 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1826 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1827 }
1828 /* The buffer is now empty. Make it ready again. */
1829 lcs_ready_buffer(&card->read, buffer);
1830}
1831
1832/**
1833 * get network statistics for ifconfig and other user programs
1834 */
1835static struct net_device_stats *
1836lcs_getstats(struct net_device *dev)
1837{
1838 struct lcs_card *card;
1839
1840 LCS_DBF_TEXT(4, trace, "netstats");
1841 card = (struct lcs_card *) dev->ml_priv;
1842 return &card->stats;
1843}
1844
1845/**
1846 * stop lcs device
1847 * This function will be called by user doing ifconfig xxx down
1848 */
1849static int
1850lcs_stop_device(struct net_device *dev)
1851{
1852 struct lcs_card *card;
1853 int rc;
1854
1855 LCS_DBF_TEXT(2, trace, "stopdev");
1856 card = (struct lcs_card *) dev->ml_priv;
1857 netif_carrier_off(dev);
1858 netif_tx_disable(dev);
1859 dev->flags &= ~IFF_UP;
1860 wait_event(card->write.wait_q,
1861 (card->write.state != LCS_CH_STATE_RUNNING));
1862 rc = lcs_stopcard(card);
1863 if (rc)
1864 dev_err(&card->dev->dev,
1865 " Shutting down the LCS device failed\n");
1866 return rc;
1867}
1868
1869/**
1870 * start lcs device and make it runnable
1871 * This function will be called by user doing ifconfig xxx up
1872 */
1873static int
1874lcs_open_device(struct net_device *dev)
1875{
1876 struct lcs_card *card;
1877 int rc;
1878
1879 LCS_DBF_TEXT(2, trace, "opendev");
1880 card = (struct lcs_card *) dev->ml_priv;
1881 /* initialize statistics */
1882 rc = lcs_detect(card);
1883 if (rc) {
1884 pr_err("Error in opening device!\n");
1885
1886 } else {
1887 dev->flags |= IFF_UP;
1888 netif_carrier_on(dev);
1889 netif_wake_queue(dev);
1890 card->state = DEV_STATE_UP;
1891 }
1892 return rc;
1893}
1894
1895/**
1896 * show function for portno called by cat or similar things
1897 */
1898static ssize_t
1899lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1900{
1901 struct lcs_card *card;
1902
1903 card = dev_get_drvdata(dev);
1904
1905 if (!card)
1906 return 0;
1907
1908 return sprintf(buf, "%d\n", card->portno);
1909}
1910
1911/**
1912 * store the value which is piped to file portno
1913 */
1914static ssize_t
1915lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1916{
1917 struct lcs_card *card;
1918 int rc;
1919 s16 value;
1920
1921 card = dev_get_drvdata(dev);
1922
1923 if (!card)
1924 return 0;
1925
1926 rc = kstrtos16(buf, 0, &value);
1927 if (rc)
1928 return -EINVAL;
1929 /* TODO: sanity checks */
1930 card->portno = value;
1931 if (card->dev)
1932 card->dev->dev_port = card->portno;
1933
1934 return count;
1935
1936}
1937
1938static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1939
1940static const char *lcs_type[] = {
1941 "not a channel",
1942 "2216 parallel",
1943 "2216 channel",
1944 "OSA LCS card",
1945 "unknown channel type",
1946 "unsupported channel type",
1947};
1948
1949static ssize_t
1950lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1951{
1952 struct ccwgroup_device *cgdev;
1953
1954 cgdev = to_ccwgroupdev(dev);
1955 if (!cgdev)
1956 return -ENODEV;
1957
1958 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1959}
1960
1961static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1962
1963static ssize_t
1964lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1965{
1966 struct lcs_card *card;
1967
1968 card = dev_get_drvdata(dev);
1969
1970 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1971}
1972
1973static ssize_t
1974lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1975{
1976 struct lcs_card *card;
1977 unsigned int value;
1978 int rc;
1979
1980 card = dev_get_drvdata(dev);
1981
1982 if (!card)
1983 return 0;
1984
1985 rc = kstrtouint(buf, 0, &value);
1986 if (rc)
1987 return -EINVAL;
1988 /* TODO: sanity checks */
1989 card->lancmd_timeout = value;
1990
1991 return count;
1992
1993}
1994
1995static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1996
1997static ssize_t
1998lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1999 const char *buf, size_t count)
2000{
2001 struct lcs_card *card = dev_get_drvdata(dev);
2002 char *tmp;
2003 int i;
2004
2005 if (!card)
2006 return -EINVAL;
2007 if (card->state != DEV_STATE_UP)
2008 return -EPERM;
2009 i = simple_strtoul(buf, &tmp, 16);
2010 if (i == 1)
2011 lcs_schedule_recovery(card);
2012 return count;
2013}
2014
2015static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2016
2017static struct attribute * lcs_attrs[] = {
2018 &dev_attr_portno.attr,
2019 &dev_attr_type.attr,
2020 &dev_attr_lancmd_timeout.attr,
2021 &dev_attr_recover.attr,
2022 NULL,
2023};
2024static struct attribute_group lcs_attr_group = {
2025 .attrs = lcs_attrs,
2026};
2027static const struct attribute_group *lcs_attr_groups[] = {
2028 &lcs_attr_group,
2029 NULL,
2030};
2031static const struct device_type lcs_devtype = {
2032 .name = "lcs",
2033 .groups = lcs_attr_groups,
2034};
2035
2036/**
2037 * lcs_probe_device is called on establishing a new ccwgroup_device.
2038 */
2039static int
2040lcs_probe_device(struct ccwgroup_device *ccwgdev)
2041{
2042 struct lcs_card *card;
2043
2044 if (!get_device(&ccwgdev->dev))
2045 return -ENODEV;
2046
2047 LCS_DBF_TEXT(2, setup, "add_dev");
2048 card = lcs_alloc_card();
2049 if (!card) {
2050 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2051 put_device(&ccwgdev->dev);
2052 return -ENOMEM;
2053 }
2054 dev_set_drvdata(&ccwgdev->dev, card);
2055 ccwgdev->cdev[0]->handler = lcs_irq;
2056 ccwgdev->cdev[1]->handler = lcs_irq;
2057 card->gdev = ccwgdev;
2058 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2059 card->thread_start_mask = 0;
2060 card->thread_allowed_mask = 0;
2061 card->thread_running_mask = 0;
2062 ccwgdev->dev.type = &lcs_devtype;
2063
2064 return 0;
2065}
2066
2067static int
2068lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2069{
2070 struct lcs_card *card;
2071
2072 LCS_DBF_TEXT(2, setup, "regnetdv");
2073 card = dev_get_drvdata(&ccwgdev->dev);
2074 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2075 return 0;
2076 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2077 return register_netdev(card->dev);
2078}
2079
2080/**
2081 * lcs_new_device will be called by setting the group device online.
2082 */
2083static const struct net_device_ops lcs_netdev_ops = {
2084 .ndo_open = lcs_open_device,
2085 .ndo_stop = lcs_stop_device,
2086 .ndo_get_stats = lcs_getstats,
2087 .ndo_start_xmit = lcs_start_xmit,
2088};
2089
2090static const struct net_device_ops lcs_mc_netdev_ops = {
2091 .ndo_open = lcs_open_device,
2092 .ndo_stop = lcs_stop_device,
2093 .ndo_get_stats = lcs_getstats,
2094 .ndo_start_xmit = lcs_start_xmit,
2095 .ndo_set_rx_mode = lcs_set_multicast_list,
2096};
2097
2098static int
2099lcs_new_device(struct ccwgroup_device *ccwgdev)
2100{
2101 struct lcs_card *card;
2102 struct net_device *dev=NULL;
2103 enum lcs_dev_states recover_state;
2104 int rc;
2105
2106 card = dev_get_drvdata(&ccwgdev->dev);
2107 if (!card)
2108 return -ENODEV;
2109
2110 LCS_DBF_TEXT(2, setup, "newdev");
2111 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2112 card->read.ccwdev = ccwgdev->cdev[0];
2113 card->write.ccwdev = ccwgdev->cdev[1];
2114
2115 recover_state = card->state;
2116 rc = ccw_device_set_online(card->read.ccwdev);
2117 if (rc)
2118 goto out_err;
2119 rc = ccw_device_set_online(card->write.ccwdev);
2120 if (rc)
2121 goto out_werr;
2122
2123 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2124
2125 lcs_setup_card(card);
2126 rc = lcs_detect(card);
2127 if (rc) {
2128 LCS_DBF_TEXT(2, setup, "dtctfail");
2129 dev_err(&ccwgdev->dev,
2130 "Detecting a network adapter for LCS devices"
2131 " failed with rc=%d (0x%x)\n", rc, rc);
2132 lcs_stopcard(card);
2133 goto out;
2134 }
2135 if (card->dev) {
2136 LCS_DBF_TEXT(2, setup, "samedev");
2137 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2138 goto netdev_out;
2139 }
2140 switch (card->lan_type) {
2141#ifdef CONFIG_ETHERNET
2142 case LCS_FRAME_TYPE_ENET:
2143 card->lan_type_trans = eth_type_trans;
2144 dev = alloc_etherdev(0);
2145 break;
2146#endif
2147#ifdef CONFIG_FDDI
2148 case LCS_FRAME_TYPE_FDDI:
2149 card->lan_type_trans = fddi_type_trans;
2150 dev = alloc_fddidev(0);
2151 break;
2152#endif
2153 default:
2154 LCS_DBF_TEXT(3, setup, "errinit");
2155 pr_err(" Initialization failed\n");
2156 goto out;
2157 }
2158 if (!dev)
2159 goto out;
2160 card->dev = dev;
2161 card->dev->ml_priv = card;
2162 card->dev->netdev_ops = &lcs_netdev_ops;
2163 card->dev->dev_port = card->portno;
2164 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2165#ifdef CONFIG_IP_MULTICAST
2166 if (!lcs_check_multicast_support(card))
2167 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2168#endif
2169netdev_out:
2170 lcs_set_allowed_threads(card,0xffffffff);
2171 if (recover_state == DEV_STATE_RECOVER) {
2172 lcs_set_multicast_list(card->dev);
2173 card->dev->flags |= IFF_UP;
2174 netif_carrier_on(card->dev);
2175 netif_wake_queue(card->dev);
2176 card->state = DEV_STATE_UP;
2177 } else {
2178 lcs_stopcard(card);
2179 }
2180
2181 if (lcs_register_netdev(ccwgdev) != 0)
2182 goto out;
2183
2184 /* Print out supported assists: IPv6 */
2185 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2186 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2187 "with" : "without");
2188 /* Print out supported assist: Multicast */
2189 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2190 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2191 "with" : "without");
2192 return 0;
2193out:
2194
2195 ccw_device_set_offline(card->write.ccwdev);
2196out_werr:
2197 ccw_device_set_offline(card->read.ccwdev);
2198out_err:
2199 return -ENODEV;
2200}
2201
2202/**
2203 * lcs_shutdown_device, called when setting the group device offline.
2204 */
2205static int
2206__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2207{
2208 struct lcs_card *card;
2209 enum lcs_dev_states recover_state;
2210 int ret = 0, ret2 = 0, ret3 = 0;
2211
2212 LCS_DBF_TEXT(3, setup, "shtdndev");
2213 card = dev_get_drvdata(&ccwgdev->dev);
2214 if (!card)
2215 return -ENODEV;
2216 if (recovery_mode == 0) {
2217 lcs_set_allowed_threads(card, 0);
2218 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2219 return -ERESTARTSYS;
2220 }
2221 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2222 recover_state = card->state;
2223
2224 ret = lcs_stop_device(card->dev);
2225 ret2 = ccw_device_set_offline(card->read.ccwdev);
2226 ret3 = ccw_device_set_offline(card->write.ccwdev);
2227 if (!ret)
2228 ret = (ret2) ? ret2 : ret3;
2229 if (ret)
2230 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2231 if (recover_state == DEV_STATE_UP) {
2232 card->state = DEV_STATE_RECOVER;
2233 }
2234 return 0;
2235}
2236
2237static int
2238lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2239{
2240 return __lcs_shutdown_device(ccwgdev, 0);
2241}
2242
2243/**
2244 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2245 */
2246static int
2247lcs_recovery(void *ptr)
2248{
2249 struct lcs_card *card;
2250 struct ccwgroup_device *gdev;
2251 int rc;
2252
2253 card = (struct lcs_card *) ptr;
2254
2255 LCS_DBF_TEXT(4, trace, "recover1");
2256 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2257 return 0;
2258 LCS_DBF_TEXT(4, trace, "recover2");
2259 gdev = card->gdev;
2260 dev_warn(&gdev->dev,
2261 "A recovery process has been started for the LCS device\n");
2262 rc = __lcs_shutdown_device(gdev, 1);
2263 rc = lcs_new_device(gdev);
2264 if (!rc)
2265 pr_info("Device %s successfully recovered!\n",
2266 card->dev->name);
2267 else
2268 pr_info("Device %s could not be recovered!\n",
2269 card->dev->name);
2270 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2271 return 0;
2272}
2273
2274/**
2275 * lcs_remove_device, free buffers and card
2276 */
2277static void
2278lcs_remove_device(struct ccwgroup_device *ccwgdev)
2279{
2280 struct lcs_card *card;
2281
2282 card = dev_get_drvdata(&ccwgdev->dev);
2283 if (!card)
2284 return;
2285
2286 LCS_DBF_TEXT(3, setup, "remdev");
2287 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2288 if (ccwgdev->state == CCWGROUP_ONLINE) {
2289 lcs_shutdown_device(ccwgdev);
2290 }
2291 if (card->dev)
2292 unregister_netdev(card->dev);
2293 lcs_cleanup_card(card);
2294 lcs_free_card(card);
2295 dev_set_drvdata(&ccwgdev->dev, NULL);
2296 put_device(&ccwgdev->dev);
2297}
2298
2299static struct ccw_device_id lcs_ids[] = {
2300 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2301 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2302 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2303 {},
2304};
2305MODULE_DEVICE_TABLE(ccw, lcs_ids);
2306
2307static struct ccw_driver lcs_ccw_driver = {
2308 .driver = {
2309 .owner = THIS_MODULE,
2310 .name = "lcs",
2311 },
2312 .ids = lcs_ids,
2313 .probe = ccwgroup_probe_ccwdev,
2314 .remove = ccwgroup_remove_ccwdev,
2315 .int_class = IRQIO_LCS,
2316};
2317
2318/**
2319 * LCS ccwgroup driver registration
2320 */
2321static struct ccwgroup_driver lcs_group_driver = {
2322 .driver = {
2323 .owner = THIS_MODULE,
2324 .name = "lcs",
2325 },
2326 .ccw_driver = &lcs_ccw_driver,
2327 .setup = lcs_probe_device,
2328 .remove = lcs_remove_device,
2329 .set_online = lcs_new_device,
2330 .set_offline = lcs_shutdown_device,
2331};
2332
2333static ssize_t group_store(struct device_driver *ddrv, const char *buf,
2334 size_t count)
2335{
2336 int err;
2337 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2338 return err ? err : count;
2339}
2340static DRIVER_ATTR_WO(group);
2341
2342static struct attribute *lcs_drv_attrs[] = {
2343 &driver_attr_group.attr,
2344 NULL,
2345};
2346static struct attribute_group lcs_drv_attr_group = {
2347 .attrs = lcs_drv_attrs,
2348};
2349static const struct attribute_group *lcs_drv_attr_groups[] = {
2350 &lcs_drv_attr_group,
2351 NULL,
2352};
2353
2354/**
2355 * LCS Module/Kernel initialization function
2356 */
2357static int
2358__init lcs_init_module(void)
2359{
2360 int rc;
2361
2362 pr_info("Loading %s\n", version);
2363 rc = lcs_register_debug_facility();
2364 LCS_DBF_TEXT(0, setup, "lcsinit");
2365 if (rc)
2366 goto out_err;
2367 lcs_root_dev = root_device_register("lcs");
2368 rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2369 if (rc)
2370 goto register_err;
2371 rc = ccw_driver_register(&lcs_ccw_driver);
2372 if (rc)
2373 goto ccw_err;
2374 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2375 rc = ccwgroup_driver_register(&lcs_group_driver);
2376 if (rc)
2377 goto ccwgroup_err;
2378 return 0;
2379
2380ccwgroup_err:
2381 ccw_driver_unregister(&lcs_ccw_driver);
2382ccw_err:
2383 root_device_unregister(lcs_root_dev);
2384register_err:
2385 lcs_unregister_debug_facility();
2386out_err:
2387 pr_err("Initializing the lcs device driver failed\n");
2388 return rc;
2389}
2390
2391
2392/**
2393 * LCS module cleanup function
2394 */
2395static void
2396__exit lcs_cleanup_module(void)
2397{
2398 pr_info("Terminating lcs module.\n");
2399 LCS_DBF_TEXT(0, trace, "cleanup");
2400 ccwgroup_driver_unregister(&lcs_group_driver);
2401 ccw_driver_unregister(&lcs_ccw_driver);
2402 root_device_unregister(lcs_root_dev);
2403 lcs_unregister_debug_facility();
2404}
2405
2406module_init(lcs_init_module);
2407module_exit(lcs_cleanup_module);
2408
2409MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2410MODULE_LICENSE("GPL");
2411
1/*
2 * Linux for S/390 Lan Channel Station Network Driver
3 *
4 * Copyright IBM Corp. 1999, 2009
5 * Author(s): Original Code written by
6 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
7 * Rewritten by
8 * Frank Pavlic <fpavlic@de.ibm.com> and
9 * Martin Schwidefsky <schwidefsky@de.ibm.com>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2, or (at your option)
14 * any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26#define KMSG_COMPONENT "lcs"
27#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
28
29#include <linux/module.h>
30#include <linux/if.h>
31#include <linux/netdevice.h>
32#include <linux/etherdevice.h>
33#include <linux/fddidevice.h>
34#include <linux/inetdevice.h>
35#include <linux/in.h>
36#include <linux/igmp.h>
37#include <linux/delay.h>
38#include <linux/kthread.h>
39#include <linux/slab.h>
40#include <net/arp.h>
41#include <net/ip.h>
42
43#include <asm/debug.h>
44#include <asm/idals.h>
45#include <asm/timex.h>
46#include <linux/device.h>
47#include <asm/ccwgroup.h>
48
49#include "lcs.h"
50
51
52#if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
53#error Cannot compile lcs.c without some net devices switched on.
54#endif
55
56/**
57 * initialization string for output
58 */
59
60static char version[] __initdata = "LCS driver";
61
62/**
63 * the root device for lcs group devices
64 */
65static struct device *lcs_root_dev;
66
67/**
68 * Some prototypes.
69 */
70static void lcs_tasklet(unsigned long);
71static void lcs_start_kernel_thread(struct work_struct *);
72static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
73#ifdef CONFIG_IP_MULTICAST
74static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
75#endif /* CONFIG_IP_MULTICAST */
76static int lcs_recovery(void *ptr);
77
78/**
79 * Debug Facility Stuff
80 */
81static char debug_buffer[255];
82static debug_info_t *lcs_dbf_setup;
83static debug_info_t *lcs_dbf_trace;
84
85/**
86 * LCS Debug Facility functions
87 */
88static void
89lcs_unregister_debug_facility(void)
90{
91 debug_unregister(lcs_dbf_setup);
92 debug_unregister(lcs_dbf_trace);
93}
94
95static int
96lcs_register_debug_facility(void)
97{
98 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
99 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
100 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
101 pr_err("Not enough memory for debug facility.\n");
102 lcs_unregister_debug_facility();
103 return -ENOMEM;
104 }
105 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
106 debug_set_level(lcs_dbf_setup, 2);
107 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
108 debug_set_level(lcs_dbf_trace, 2);
109 return 0;
110}
111
112/**
113 * Allocate io buffers.
114 */
115static int
116lcs_alloc_channel(struct lcs_channel *channel)
117{
118 int cnt;
119
120 LCS_DBF_TEXT(2, setup, "ichalloc");
121 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
122 /* alloc memory fo iobuffer */
123 channel->iob[cnt].data =
124 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
125 if (channel->iob[cnt].data == NULL)
126 break;
127 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
128 }
129 if (cnt < LCS_NUM_BUFFS) {
130 /* Not all io buffers could be allocated. */
131 LCS_DBF_TEXT(2, setup, "echalloc");
132 while (cnt-- > 0)
133 kfree(channel->iob[cnt].data);
134 return -ENOMEM;
135 }
136 return 0;
137}
138
139/**
140 * Free io buffers.
141 */
142static void
143lcs_free_channel(struct lcs_channel *channel)
144{
145 int cnt;
146
147 LCS_DBF_TEXT(2, setup, "ichfree");
148 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
149 kfree(channel->iob[cnt].data);
150 channel->iob[cnt].data = NULL;
151 }
152}
153
154/*
155 * Cleanup channel.
156 */
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 = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
190 if (card == NULL)
191 return NULL;
192 card->lan_type = LCS_FRAME_TYPE_AUTO;
193 card->pkt_seq = 0;
194 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
195 /* Allocate io buffers for the read channel. */
196 rc = lcs_alloc_channel(&card->read);
197 if (rc){
198 LCS_DBF_TEXT(2, setup, "iccwerr");
199 lcs_free_card(card);
200 return NULL;
201 }
202 /* Allocate io buffers for the write channel. */
203 rc = lcs_alloc_channel(&card->write);
204 if (rc) {
205 LCS_DBF_TEXT(2, setup, "iccwerr");
206 lcs_cleanup_channel(&card->read);
207 lcs_free_card(card);
208 return NULL;
209 }
210
211#ifdef CONFIG_IP_MULTICAST
212 INIT_LIST_HEAD(&card->ipm_list);
213#endif
214 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
215 return card;
216}
217
218/*
219 * Setup read channel.
220 */
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 = LCS_BUF_STATE_READY;
244 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
245 }
246 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
247 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
248 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
249 /* Last ccw is a tic (transfer in channel). */
250 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
251 card->read.ccws[LCS_NUM_BUFFS].cda =
252 (__u32) __pa(card->read.ccws);
253 /* Setg initial state of the read channel. */
254 card->read.state = LCS_CH_STATE_INIT;
255
256 card->read.io_idx = 0;
257 card->read.buf_idx = 0;
258}
259
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 = LCS_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 init_waitqueue_head(&card->wait_q);
438 spin_lock_init(&card->lock);
439 spin_lock_init(&card->ipm_lock);
440 spin_lock_init(&card->mask_lock);
441#ifdef CONFIG_IP_MULTICAST
442 INIT_LIST_HEAD(&card->ipm_list);
443#endif
444 INIT_LIST_HEAD(&card->lancmd_waiters);
445}
446
447static inline void
448lcs_clear_multicast_list(struct lcs_card *card)
449{
450#ifdef CONFIG_IP_MULTICAST
451 struct lcs_ipm_list *ipm;
452 unsigned long flags;
453
454 /* Free multicast list. */
455 LCS_DBF_TEXT(3, setup, "clmclist");
456 spin_lock_irqsave(&card->ipm_lock, flags);
457 while (!list_empty(&card->ipm_list)){
458 ipm = list_entry(card->ipm_list.next,
459 struct lcs_ipm_list, list);
460 list_del(&ipm->list);
461 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
462 spin_unlock_irqrestore(&card->ipm_lock, flags);
463 lcs_send_delipm(card, ipm);
464 spin_lock_irqsave(&card->ipm_lock, flags);
465 }
466 kfree(ipm);
467 }
468 spin_unlock_irqrestore(&card->ipm_lock, flags);
469#endif
470}
471/**
472 * Cleanup channels,card and state machines.
473 */
474static void
475lcs_cleanup_card(struct lcs_card *card)
476{
477
478 LCS_DBF_TEXT(3, setup, "cleancrd");
479 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
480
481 if (card->dev != NULL)
482 free_netdev(card->dev);
483 /* Cleanup channels. */
484 lcs_cleanup_channel(&card->write);
485 lcs_cleanup_channel(&card->read);
486}
487
488/**
489 * Start channel.
490 */
491static int
492lcs_start_channel(struct lcs_channel *channel)
493{
494 unsigned long flags;
495 int rc;
496
497 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
498 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
499 rc = ccw_device_start(channel->ccwdev,
500 channel->ccws + channel->io_idx, 0, 0,
501 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
502 if (rc == 0)
503 channel->state = LCS_CH_STATE_RUNNING;
504 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
505 if (rc) {
506 LCS_DBF_TEXT_(4,trace,"essh%s",
507 dev_name(&channel->ccwdev->dev));
508 dev_err(&channel->ccwdev->dev,
509 "Starting an LCS device resulted in an error,"
510 " rc=%d!\n", rc);
511 }
512 return rc;
513}
514
515static int
516lcs_clear_channel(struct lcs_channel *channel)
517{
518 unsigned long flags;
519 int rc;
520
521 LCS_DBF_TEXT(4,trace,"clearch");
522 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
523 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
524 rc = ccw_device_clear(channel->ccwdev, (addr_t) channel);
525 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
526 if (rc) {
527 LCS_DBF_TEXT_(4, trace, "ecsc%s",
528 dev_name(&channel->ccwdev->dev));
529 return rc;
530 }
531 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
532 channel->state = LCS_CH_STATE_STOPPED;
533 return rc;
534}
535
536
537/**
538 * Stop channel.
539 */
540static int
541lcs_stop_channel(struct lcs_channel *channel)
542{
543 unsigned long flags;
544 int rc;
545
546 if (channel->state == LCS_CH_STATE_STOPPED)
547 return 0;
548 LCS_DBF_TEXT(4,trace,"haltsch");
549 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
550 channel->state = LCS_CH_STATE_INIT;
551 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
552 rc = ccw_device_halt(channel->ccwdev, (addr_t) channel);
553 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
554 if (rc) {
555 LCS_DBF_TEXT_(4, trace, "ehsc%s",
556 dev_name(&channel->ccwdev->dev));
557 return rc;
558 }
559 /* Asynchronous halt initialted. Wait for its completion. */
560 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
561 lcs_clear_channel(channel);
562 return 0;
563}
564
565/**
566 * start read and write channel
567 */
568static int
569lcs_start_channels(struct lcs_card *card)
570{
571 int rc;
572
573 LCS_DBF_TEXT(2, trace, "chstart");
574 /* start read channel */
575 rc = lcs_start_channel(&card->read);
576 if (rc)
577 return rc;
578 /* start write channel */
579 rc = lcs_start_channel(&card->write);
580 if (rc)
581 lcs_stop_channel(&card->read);
582 return rc;
583}
584
585/**
586 * stop read and write channel
587 */
588static int
589lcs_stop_channels(struct lcs_card *card)
590{
591 LCS_DBF_TEXT(2, trace, "chhalt");
592 lcs_stop_channel(&card->read);
593 lcs_stop_channel(&card->write);
594 return 0;
595}
596
597/**
598 * Get empty buffer.
599 */
600static struct lcs_buffer *
601__lcs_get_buffer(struct lcs_channel *channel)
602{
603 int index;
604
605 LCS_DBF_TEXT(5, trace, "_getbuff");
606 index = channel->io_idx;
607 do {
608 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
609 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
610 return channel->iob + index;
611 }
612 index = (index + 1) & (LCS_NUM_BUFFS - 1);
613 } while (index != channel->io_idx);
614 return NULL;
615}
616
617static struct lcs_buffer *
618lcs_get_buffer(struct lcs_channel *channel)
619{
620 struct lcs_buffer *buffer;
621 unsigned long flags;
622
623 LCS_DBF_TEXT(5, trace, "getbuff");
624 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
625 buffer = __lcs_get_buffer(channel);
626 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
627 return buffer;
628}
629
630/**
631 * Resume channel program if the channel is suspended.
632 */
633static int
634__lcs_resume_channel(struct lcs_channel *channel)
635{
636 int rc;
637
638 if (channel->state != LCS_CH_STATE_SUSPENDED)
639 return 0;
640 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
641 return 0;
642 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
643 rc = ccw_device_resume(channel->ccwdev);
644 if (rc) {
645 LCS_DBF_TEXT_(4, trace, "ersc%s",
646 dev_name(&channel->ccwdev->dev));
647 dev_err(&channel->ccwdev->dev,
648 "Sending data from the LCS device to the LAN failed"
649 " with rc=%d\n",rc);
650 } else
651 channel->state = LCS_CH_STATE_RUNNING;
652 return rc;
653
654}
655
656/**
657 * Make a buffer ready for processing.
658 */
659static inline void
660__lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
661{
662 int prev, next;
663
664 LCS_DBF_TEXT(5, trace, "rdybits");
665 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
666 next = (index + 1) & (LCS_NUM_BUFFS - 1);
667 /* Check if we may clear the suspend bit of this buffer. */
668 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
669 /* Check if we have to set the PCI bit. */
670 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
671 /* Suspend bit of the previous buffer is not set. */
672 channel->ccws[index].flags |= CCW_FLAG_PCI;
673 /* Suspend bit of the next buffer is set. */
674 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
675 }
676}
677
678static int
679lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
680{
681 unsigned long flags;
682 int index, rc;
683
684 LCS_DBF_TEXT(5, trace, "rdybuff");
685 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
686 buffer->state != LCS_BUF_STATE_PROCESSED);
687 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
688 buffer->state = LCS_BUF_STATE_READY;
689 index = buffer - channel->iob;
690 /* Set length. */
691 channel->ccws[index].count = buffer->count;
692 /* Check relevant PCI/suspend bits. */
693 __lcs_ready_buffer_bits(channel, index);
694 rc = __lcs_resume_channel(channel);
695 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
696 return rc;
697}
698
699/**
700 * Mark the buffer as processed. Take care of the suspend bit
701 * of the previous buffer. This function is called from
702 * interrupt context, so the lock must not be taken.
703 */
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 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
711 buffer->state = LCS_BUF_STATE_PROCESSED;
712 index = buffer - channel->iob;
713 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
714 next = (index + 1) & (LCS_NUM_BUFFS - 1);
715 /* Set the suspend bit and clear the PCI bit of this buffer. */
716 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
717 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
718 /* Check the suspend bit of the previous buffer. */
719 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
720 /*
721 * Previous buffer is in state ready. It might have
722 * happened in lcs_ready_buffer that the suspend bit
723 * has not been cleared to avoid an endless loop.
724 * Do it now.
725 */
726 __lcs_ready_buffer_bits(channel, prev);
727 }
728 /* Clear PCI bit of next buffer. */
729 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
730 return __lcs_resume_channel(channel);
731}
732
733/**
734 * Put a processed buffer back to state empty.
735 */
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 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
743 buffer->state != LCS_BUF_STATE_PROCESSED);
744 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
745 buffer->state = LCS_BUF_STATE_EMPTY;
746 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
747}
748
749/**
750 * Get buffer for a lan command.
751 */
752static struct lcs_buffer *
753lcs_get_lancmd(struct lcs_card *card, int count)
754{
755 struct lcs_buffer *buffer;
756 struct lcs_cmd *cmd;
757
758 LCS_DBF_TEXT(4, trace, "getlncmd");
759 /* Get buffer and wait if none is available. */
760 wait_event(card->write.wait_q,
761 ((buffer = lcs_get_buffer(&card->write)) != NULL));
762 count += sizeof(struct lcs_header);
763 *(__u16 *)(buffer->data + count) = 0;
764 buffer->count = count + sizeof(__u16);
765 buffer->callback = lcs_release_buffer;
766 cmd = (struct lcs_cmd *) buffer->data;
767 cmd->offset = count;
768 cmd->type = LCS_FRAME_TYPE_CONTROL;
769 cmd->slot = 0;
770 return buffer;
771}
772
773
774static void
775lcs_get_reply(struct lcs_reply *reply)
776{
777 WARN_ON(atomic_read(&reply->refcnt) <= 0);
778 atomic_inc(&reply->refcnt);
779}
780
781static void
782lcs_put_reply(struct lcs_reply *reply)
783{
784 WARN_ON(atomic_read(&reply->refcnt) <= 0);
785 if (atomic_dec_and_test(&reply->refcnt)) {
786 kfree(reply);
787 }
788
789}
790
791static struct lcs_reply *
792lcs_alloc_reply(struct lcs_cmd *cmd)
793{
794 struct lcs_reply *reply;
795
796 LCS_DBF_TEXT(4, trace, "getreply");
797
798 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
799 if (!reply)
800 return NULL;
801 atomic_set(&reply->refcnt,1);
802 reply->sequence_no = cmd->sequence_no;
803 reply->received = 0;
804 reply->rc = 0;
805 init_waitqueue_head(&reply->wait_q);
806
807 return reply;
808}
809
810/**
811 * Notifier function for lancmd replies. Called from read irq.
812 */
813static void
814lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
815{
816 struct list_head *l, *n;
817 struct lcs_reply *reply;
818
819 LCS_DBF_TEXT(4, trace, "notiwait");
820 spin_lock(&card->lock);
821 list_for_each_safe(l, n, &card->lancmd_waiters) {
822 reply = list_entry(l, struct lcs_reply, list);
823 if (reply->sequence_no == cmd->sequence_no) {
824 lcs_get_reply(reply);
825 list_del_init(&reply->list);
826 if (reply->callback != NULL)
827 reply->callback(card, cmd);
828 reply->received = 1;
829 reply->rc = cmd->return_code;
830 wake_up(&reply->wait_q);
831 lcs_put_reply(reply);
832 break;
833 }
834 }
835 spin_unlock(&card->lock);
836}
837
838/**
839 * Emit buffer of a lan command.
840 */
841static void
842lcs_lancmd_timeout(unsigned long data)
843{
844 struct lcs_reply *reply, *list_reply, *r;
845 unsigned long flags;
846
847 LCS_DBF_TEXT(4, trace, "timeout");
848 reply = (struct lcs_reply *) data;
849 spin_lock_irqsave(&reply->card->lock, flags);
850 list_for_each_entry_safe(list_reply, r,
851 &reply->card->lancmd_waiters,list) {
852 if (reply == list_reply) {
853 lcs_get_reply(reply);
854 list_del_init(&reply->list);
855 spin_unlock_irqrestore(&reply->card->lock, flags);
856 reply->received = 1;
857 reply->rc = -ETIME;
858 wake_up(&reply->wait_q);
859 lcs_put_reply(reply);
860 return;
861 }
862 }
863 spin_unlock_irqrestore(&reply->card->lock, flags);
864}
865
866static int
867lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
868 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
869{
870 struct lcs_reply *reply;
871 struct lcs_cmd *cmd;
872 struct timer_list timer;
873 unsigned long flags;
874 int rc;
875
876 LCS_DBF_TEXT(4, trace, "sendcmd");
877 cmd = (struct lcs_cmd *) buffer->data;
878 cmd->return_code = 0;
879 cmd->sequence_no = card->sequence_no++;
880 reply = lcs_alloc_reply(cmd);
881 if (!reply)
882 return -ENOMEM;
883 reply->callback = reply_callback;
884 reply->card = card;
885 spin_lock_irqsave(&card->lock, flags);
886 list_add_tail(&reply->list, &card->lancmd_waiters);
887 spin_unlock_irqrestore(&card->lock, flags);
888
889 buffer->callback = lcs_release_buffer;
890 rc = lcs_ready_buffer(&card->write, buffer);
891 if (rc)
892 return rc;
893 init_timer_on_stack(&timer);
894 timer.function = lcs_lancmd_timeout;
895 timer.data = (unsigned long) reply;
896 timer.expires = jiffies + HZ*card->lancmd_timeout;
897 add_timer(&timer);
898 wait_event(reply->wait_q, reply->received);
899 del_timer_sync(&timer);
900 destroy_timer_on_stack(&timer);
901 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
902 rc = reply->rc;
903 lcs_put_reply(reply);
904 return rc ? -EIO : 0;
905}
906
907/**
908 * LCS startup command
909 */
910static int
911lcs_send_startup(struct lcs_card *card, __u8 initiator)
912{
913 struct lcs_buffer *buffer;
914 struct lcs_cmd *cmd;
915
916 LCS_DBF_TEXT(2, trace, "startup");
917 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
918 cmd = (struct lcs_cmd *) buffer->data;
919 cmd->cmd_code = LCS_CMD_STARTUP;
920 cmd->initiator = initiator;
921 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
922 return lcs_send_lancmd(card, buffer, NULL);
923}
924
925/**
926 * LCS shutdown command
927 */
928static int
929lcs_send_shutdown(struct lcs_card *card)
930{
931 struct lcs_buffer *buffer;
932 struct lcs_cmd *cmd;
933
934 LCS_DBF_TEXT(2, trace, "shutdown");
935 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
936 cmd = (struct lcs_cmd *) buffer->data;
937 cmd->cmd_code = LCS_CMD_SHUTDOWN;
938 cmd->initiator = LCS_INITIATOR_TCPIP;
939 return lcs_send_lancmd(card, buffer, NULL);
940}
941
942/**
943 * LCS lanstat command
944 */
945static void
946__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
947{
948 LCS_DBF_TEXT(2, trace, "statcb");
949 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
950}
951
952static int
953lcs_send_lanstat(struct lcs_card *card)
954{
955 struct lcs_buffer *buffer;
956 struct lcs_cmd *cmd;
957
958 LCS_DBF_TEXT(2,trace, "cmdstat");
959 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
960 cmd = (struct lcs_cmd *) buffer->data;
961 /* Setup lanstat command. */
962 cmd->cmd_code = LCS_CMD_LANSTAT;
963 cmd->initiator = LCS_INITIATOR_TCPIP;
964 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
965 cmd->cmd.lcs_std_cmd.portno = card->portno;
966 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
967}
968
969/**
970 * send stoplan command
971 */
972static int
973lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
974{
975 struct lcs_buffer *buffer;
976 struct lcs_cmd *cmd;
977
978 LCS_DBF_TEXT(2, trace, "cmdstpln");
979 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
980 cmd = (struct lcs_cmd *) buffer->data;
981 cmd->cmd_code = LCS_CMD_STOPLAN;
982 cmd->initiator = initiator;
983 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
984 cmd->cmd.lcs_std_cmd.portno = card->portno;
985 return lcs_send_lancmd(card, buffer, NULL);
986}
987
988/**
989 * send startlan command
990 */
991static void
992__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
993{
994 LCS_DBF_TEXT(2, trace, "srtlancb");
995 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
996 card->portno = cmd->cmd.lcs_std_cmd.portno;
997}
998
999static int
1000lcs_send_startlan(struct lcs_card *card, __u8 initiator)
1001{
1002 struct lcs_buffer *buffer;
1003 struct lcs_cmd *cmd;
1004
1005 LCS_DBF_TEXT(2, trace, "cmdstaln");
1006 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1007 cmd = (struct lcs_cmd *) buffer->data;
1008 cmd->cmd_code = LCS_CMD_STARTLAN;
1009 cmd->initiator = initiator;
1010 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
1011 cmd->cmd.lcs_std_cmd.portno = card->portno;
1012 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
1013}
1014
1015#ifdef CONFIG_IP_MULTICAST
1016/**
1017 * send setipm command (Multicast)
1018 */
1019static int
1020lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1021{
1022 struct lcs_buffer *buffer;
1023 struct lcs_cmd *cmd;
1024
1025 LCS_DBF_TEXT(2, trace, "cmdsetim");
1026 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1027 cmd = (struct lcs_cmd *) buffer->data;
1028 cmd->cmd_code = LCS_CMD_SETIPM;
1029 cmd->initiator = LCS_INITIATOR_TCPIP;
1030 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1031 cmd->cmd.lcs_qipassist.portno = card->portno;
1032 cmd->cmd.lcs_qipassist.version = 4;
1033 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1034 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1035 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1036 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1037 return lcs_send_lancmd(card, buffer, NULL);
1038}
1039
1040/**
1041 * send delipm command (Multicast)
1042 */
1043static int
1044lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1045{
1046 struct lcs_buffer *buffer;
1047 struct lcs_cmd *cmd;
1048
1049 LCS_DBF_TEXT(2, trace, "cmddelim");
1050 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1051 cmd = (struct lcs_cmd *) buffer->data;
1052 cmd->cmd_code = LCS_CMD_DELIPM;
1053 cmd->initiator = LCS_INITIATOR_TCPIP;
1054 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1055 cmd->cmd.lcs_qipassist.portno = card->portno;
1056 cmd->cmd.lcs_qipassist.version = 4;
1057 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1058 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1059 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1060 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1061 return lcs_send_lancmd(card, buffer, NULL);
1062}
1063
1064/**
1065 * check if multicast is supported by LCS
1066 */
1067static void
1068__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1069{
1070 LCS_DBF_TEXT(2, trace, "chkmccb");
1071 card->ip_assists_supported =
1072 cmd->cmd.lcs_qipassist.ip_assists_supported;
1073 card->ip_assists_enabled =
1074 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1075}
1076
1077static int
1078lcs_check_multicast_support(struct lcs_card *card)
1079{
1080 struct lcs_buffer *buffer;
1081 struct lcs_cmd *cmd;
1082 int rc;
1083
1084 LCS_DBF_TEXT(2, trace, "cmdqipa");
1085 /* Send query ipassist. */
1086 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1087 cmd = (struct lcs_cmd *) buffer->data;
1088 cmd->cmd_code = LCS_CMD_QIPASSIST;
1089 cmd->initiator = LCS_INITIATOR_TCPIP;
1090 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1091 cmd->cmd.lcs_qipassist.portno = card->portno;
1092 cmd->cmd.lcs_qipassist.version = 4;
1093 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1094 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1095 if (rc != 0) {
1096 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1097 return -EOPNOTSUPP;
1098 }
1099 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1100 return 0;
1101 return -EOPNOTSUPP;
1102}
1103
1104/**
1105 * set or del multicast address on LCS card
1106 */
1107static void
1108lcs_fix_multicast_list(struct lcs_card *card)
1109{
1110 struct list_head failed_list;
1111 struct lcs_ipm_list *ipm, *tmp;
1112 unsigned long flags;
1113 int rc;
1114
1115 LCS_DBF_TEXT(4,trace, "fixipm");
1116 INIT_LIST_HEAD(&failed_list);
1117 spin_lock_irqsave(&card->ipm_lock, flags);
1118list_modified:
1119 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1120 switch (ipm->ipm_state) {
1121 case LCS_IPM_STATE_SET_REQUIRED:
1122 /* del from ipm_list so no one else can tamper with
1123 * this entry */
1124 list_del_init(&ipm->list);
1125 spin_unlock_irqrestore(&card->ipm_lock, flags);
1126 rc = lcs_send_setipm(card, ipm);
1127 spin_lock_irqsave(&card->ipm_lock, flags);
1128 if (rc) {
1129 pr_info("Adding multicast address failed."
1130 " Table possibly full!\n");
1131 /* store ipm in failed list -> will be added
1132 * to ipm_list again, so a retry will be done
1133 * during the next call of this function */
1134 list_add_tail(&ipm->list, &failed_list);
1135 } else {
1136 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1137 /* re-insert into ipm_list */
1138 list_add_tail(&ipm->list, &card->ipm_list);
1139 }
1140 goto list_modified;
1141 case LCS_IPM_STATE_DEL_REQUIRED:
1142 list_del(&ipm->list);
1143 spin_unlock_irqrestore(&card->ipm_lock, flags);
1144 lcs_send_delipm(card, ipm);
1145 spin_lock_irqsave(&card->ipm_lock, flags);
1146 kfree(ipm);
1147 goto list_modified;
1148 case LCS_IPM_STATE_ON_CARD:
1149 break;
1150 }
1151 }
1152 /* re-insert all entries from the failed_list into ipm_list */
1153 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1154 list_move_tail(&ipm->list, &card->ipm_list);
1155
1156 spin_unlock_irqrestore(&card->ipm_lock, flags);
1157}
1158
1159/**
1160 * get mac address for the relevant Multicast address
1161 */
1162static void
1163lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1164{
1165 LCS_DBF_TEXT(4,trace, "getmac");
1166 ip_eth_mc_map(ipm, mac);
1167}
1168
1169/**
1170 * function called by net device to handle multicast address relevant things
1171 */
1172static inline void
1173lcs_remove_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1174{
1175 struct ip_mc_list *im4;
1176 struct list_head *l;
1177 struct lcs_ipm_list *ipm;
1178 unsigned long flags;
1179 char buf[MAX_ADDR_LEN];
1180
1181 LCS_DBF_TEXT(4, trace, "remmclst");
1182 spin_lock_irqsave(&card->ipm_lock, flags);
1183 list_for_each(l, &card->ipm_list) {
1184 ipm = list_entry(l, struct lcs_ipm_list, list);
1185 for (im4 = rcu_dereference(in4_dev->mc_list);
1186 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1187 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1188 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1189 (memcmp(buf, &ipm->ipm.mac_addr,
1190 LCS_MAC_LENGTH) == 0) )
1191 break;
1192 }
1193 if (im4 == NULL)
1194 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1195 }
1196 spin_unlock_irqrestore(&card->ipm_lock, flags);
1197}
1198
1199static inline struct lcs_ipm_list *
1200lcs_check_addr_entry(struct lcs_card *card, struct ip_mc_list *im4, char *buf)
1201{
1202 struct lcs_ipm_list *tmp, *ipm = NULL;
1203 struct list_head *l;
1204 unsigned long flags;
1205
1206 LCS_DBF_TEXT(4, trace, "chkmcent");
1207 spin_lock_irqsave(&card->ipm_lock, flags);
1208 list_for_each(l, &card->ipm_list) {
1209 tmp = list_entry(l, struct lcs_ipm_list, list);
1210 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1211 (memcmp(buf, &tmp->ipm.mac_addr,
1212 LCS_MAC_LENGTH) == 0) ) {
1213 ipm = tmp;
1214 break;
1215 }
1216 }
1217 spin_unlock_irqrestore(&card->ipm_lock, flags);
1218 return ipm;
1219}
1220
1221static inline void
1222lcs_set_mc_addresses(struct lcs_card *card, struct in_device *in4_dev)
1223{
1224
1225 struct ip_mc_list *im4;
1226 struct lcs_ipm_list *ipm;
1227 char buf[MAX_ADDR_LEN];
1228 unsigned long flags;
1229
1230 LCS_DBF_TEXT(4, trace, "setmclst");
1231 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1232 im4 = rcu_dereference(im4->next_rcu)) {
1233 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1234 ipm = lcs_check_addr_entry(card, im4, buf);
1235 if (ipm != NULL)
1236 continue; /* Address already in list. */
1237 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1238 if (ipm == NULL) {
1239 pr_info("Not enough memory to add"
1240 " new multicast entry!\n");
1241 break;
1242 }
1243 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1244 ipm->ipm.ip_addr = im4->multiaddr;
1245 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1246 spin_lock_irqsave(&card->ipm_lock, flags);
1247 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1248 list_add(&ipm->list, &card->ipm_list);
1249 spin_unlock_irqrestore(&card->ipm_lock, flags);
1250 }
1251}
1252
1253static int
1254lcs_register_mc_addresses(void *data)
1255{
1256 struct lcs_card *card;
1257 struct in_device *in4_dev;
1258
1259 card = (struct lcs_card *) data;
1260
1261 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1262 return 0;
1263 LCS_DBF_TEXT(4, trace, "regmulti");
1264
1265 in4_dev = in_dev_get(card->dev);
1266 if (in4_dev == NULL)
1267 goto out;
1268 rcu_read_lock();
1269 lcs_remove_mc_addresses(card,in4_dev);
1270 lcs_set_mc_addresses(card, in4_dev);
1271 rcu_read_unlock();
1272 in_dev_put(in4_dev);
1273
1274 netif_carrier_off(card->dev);
1275 netif_tx_disable(card->dev);
1276 wait_event(card->write.wait_q,
1277 (card->write.state != LCS_CH_STATE_RUNNING));
1278 lcs_fix_multicast_list(card);
1279 if (card->state == DEV_STATE_UP) {
1280 netif_carrier_on(card->dev);
1281 netif_wake_queue(card->dev);
1282 }
1283out:
1284 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1285 return 0;
1286}
1287#endif /* CONFIG_IP_MULTICAST */
1288
1289/**
1290 * function called by net device to
1291 * handle multicast address relevant things
1292 */
1293static void
1294lcs_set_multicast_list(struct net_device *dev)
1295{
1296#ifdef CONFIG_IP_MULTICAST
1297 struct lcs_card *card;
1298
1299 LCS_DBF_TEXT(4, trace, "setmulti");
1300 card = (struct lcs_card *) dev->ml_priv;
1301
1302 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1303 schedule_work(&card->kernel_thread_starter);
1304#endif /* CONFIG_IP_MULTICAST */
1305}
1306
1307static long
1308lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1309{
1310 if (!IS_ERR(irb))
1311 return 0;
1312
1313 switch (PTR_ERR(irb)) {
1314 case -EIO:
1315 dev_warn(&cdev->dev,
1316 "An I/O-error occurred on the LCS device\n");
1317 LCS_DBF_TEXT(2, trace, "ckirberr");
1318 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1319 break;
1320 case -ETIMEDOUT:
1321 dev_warn(&cdev->dev,
1322 "A command timed out on the LCS device\n");
1323 LCS_DBF_TEXT(2, trace, "ckirberr");
1324 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1325 break;
1326 default:
1327 dev_warn(&cdev->dev,
1328 "An error occurred on the LCS device, rc=%ld\n",
1329 PTR_ERR(irb));
1330 LCS_DBF_TEXT(2, trace, "ckirberr");
1331 LCS_DBF_TEXT(2, trace, " rc???");
1332 }
1333 return PTR_ERR(irb);
1334}
1335
1336static int
1337lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1338{
1339 int dstat, cstat;
1340 char *sense;
1341
1342 sense = (char *) irb->ecw;
1343 cstat = irb->scsw.cmd.cstat;
1344 dstat = irb->scsw.cmd.dstat;
1345
1346 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1347 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1348 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1349 LCS_DBF_TEXT(2, trace, "CGENCHK");
1350 return 1;
1351 }
1352 if (dstat & DEV_STAT_UNIT_CHECK) {
1353 if (sense[LCS_SENSE_BYTE_1] &
1354 LCS_SENSE_RESETTING_EVENT) {
1355 LCS_DBF_TEXT(2, trace, "REVIND");
1356 return 1;
1357 }
1358 if (sense[LCS_SENSE_BYTE_0] &
1359 LCS_SENSE_CMD_REJECT) {
1360 LCS_DBF_TEXT(2, trace, "CMDREJ");
1361 return 0;
1362 }
1363 if ((!sense[LCS_SENSE_BYTE_0]) &&
1364 (!sense[LCS_SENSE_BYTE_1]) &&
1365 (!sense[LCS_SENSE_BYTE_2]) &&
1366 (!sense[LCS_SENSE_BYTE_3])) {
1367 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1368 return 0;
1369 }
1370 LCS_DBF_TEXT(2, trace, "DGENCHK");
1371 return 1;
1372 }
1373 return 0;
1374}
1375
1376static void
1377lcs_schedule_recovery(struct lcs_card *card)
1378{
1379 LCS_DBF_TEXT(2, trace, "startrec");
1380 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1381 schedule_work(&card->kernel_thread_starter);
1382}
1383
1384/**
1385 * IRQ Handler for LCS channels
1386 */
1387static void
1388lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1389{
1390 struct lcs_card *card;
1391 struct lcs_channel *channel;
1392 int rc, index;
1393 int cstat, dstat;
1394
1395 if (lcs_check_irb_error(cdev, irb))
1396 return;
1397
1398 card = CARD_FROM_DEV(cdev);
1399 if (card->read.ccwdev == cdev)
1400 channel = &card->read;
1401 else
1402 channel = &card->write;
1403
1404 cstat = irb->scsw.cmd.cstat;
1405 dstat = irb->scsw.cmd.dstat;
1406 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1407 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1408 irb->scsw.cmd.dstat);
1409 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1410 irb->scsw.cmd.actl);
1411
1412 /* Check for channel and device errors presented */
1413 rc = lcs_get_problem(cdev, irb);
1414 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1415 dev_warn(&cdev->dev,
1416 "The LCS device stopped because of an error,"
1417 " dstat=0x%X, cstat=0x%X \n",
1418 dstat, cstat);
1419 if (rc) {
1420 channel->state = LCS_CH_STATE_ERROR;
1421 }
1422 }
1423 if (channel->state == LCS_CH_STATE_ERROR) {
1424 lcs_schedule_recovery(card);
1425 wake_up(&card->wait_q);
1426 return;
1427 }
1428 /* How far in the ccw chain have we processed? */
1429 if ((channel->state != LCS_CH_STATE_INIT) &&
1430 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1431 (irb->scsw.cmd.cpa != 0)) {
1432 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1433 - channel->ccws;
1434 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1435 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1436 /* Bloody io subsystem tells us lies about cpa... */
1437 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1438 while (channel->io_idx != index) {
1439 __lcs_processed_buffer(channel,
1440 channel->iob + channel->io_idx);
1441 channel->io_idx =
1442 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1443 }
1444 }
1445
1446 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1447 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1448 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1449 /* Mark channel as stopped. */
1450 channel->state = LCS_CH_STATE_STOPPED;
1451 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1452 /* CCW execution stopped on a suspend bit. */
1453 channel->state = LCS_CH_STATE_SUSPENDED;
1454 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1455 if (irb->scsw.cmd.cc != 0) {
1456 ccw_device_halt(channel->ccwdev, (addr_t) channel);
1457 return;
1458 }
1459 /* The channel has been stopped by halt_IO. */
1460 channel->state = LCS_CH_STATE_HALTED;
1461 }
1462 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1463 channel->state = LCS_CH_STATE_CLEARED;
1464 /* Do the rest in the tasklet. */
1465 tasklet_schedule(&channel->irq_tasklet);
1466}
1467
1468/**
1469 * Tasklet for IRQ handler
1470 */
1471static void
1472lcs_tasklet(unsigned long data)
1473{
1474 unsigned long flags;
1475 struct lcs_channel *channel;
1476 struct lcs_buffer *iob;
1477 int buf_idx;
1478
1479 channel = (struct lcs_channel *) data;
1480 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1481
1482 /* Check for processed buffers. */
1483 iob = channel->iob;
1484 buf_idx = channel->buf_idx;
1485 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1486 /* Do the callback thing. */
1487 if (iob[buf_idx].callback != NULL)
1488 iob[buf_idx].callback(channel, iob + buf_idx);
1489 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1490 }
1491 channel->buf_idx = buf_idx;
1492
1493 if (channel->state == LCS_CH_STATE_STOPPED)
1494 lcs_start_channel(channel);
1495 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1496 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1497 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1498 __lcs_resume_channel(channel);
1499 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1500
1501 /* Something happened on the channel. Wake up waiters. */
1502 wake_up(&channel->wait_q);
1503}
1504
1505/**
1506 * Finish current tx buffer and make it ready for transmit.
1507 */
1508static void
1509__lcs_emit_txbuffer(struct lcs_card *card)
1510{
1511 LCS_DBF_TEXT(5, trace, "emittx");
1512 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1513 card->tx_buffer->count += 2;
1514 lcs_ready_buffer(&card->write, card->tx_buffer);
1515 card->tx_buffer = NULL;
1516 card->tx_emitted++;
1517}
1518
1519/**
1520 * Callback for finished tx buffers.
1521 */
1522static void
1523lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1524{
1525 struct lcs_card *card;
1526
1527 LCS_DBF_TEXT(5, trace, "txbuffcb");
1528 /* Put buffer back to pool. */
1529 lcs_release_buffer(channel, buffer);
1530 card = container_of(channel, struct lcs_card, write);
1531 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1532 netif_wake_queue(card->dev);
1533 spin_lock(&card->lock);
1534 card->tx_emitted--;
1535 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1536 /*
1537 * Last running tx buffer has finished. Submit partially
1538 * filled current buffer.
1539 */
1540 __lcs_emit_txbuffer(card);
1541 spin_unlock(&card->lock);
1542}
1543
1544/**
1545 * Packet transmit function called by network stack
1546 */
1547static int
1548__lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1549 struct net_device *dev)
1550{
1551 struct lcs_header *header;
1552 int rc = NETDEV_TX_OK;
1553
1554 LCS_DBF_TEXT(5, trace, "hardxmit");
1555 if (skb == NULL) {
1556 card->stats.tx_dropped++;
1557 card->stats.tx_errors++;
1558 return NETDEV_TX_OK;
1559 }
1560 if (card->state != DEV_STATE_UP) {
1561 dev_kfree_skb(skb);
1562 card->stats.tx_dropped++;
1563 card->stats.tx_errors++;
1564 card->stats.tx_carrier_errors++;
1565 return NETDEV_TX_OK;
1566 }
1567 if (skb->protocol == htons(ETH_P_IPV6)) {
1568 dev_kfree_skb(skb);
1569 return NETDEV_TX_OK;
1570 }
1571 netif_stop_queue(card->dev);
1572 spin_lock(&card->lock);
1573 if (card->tx_buffer != NULL &&
1574 card->tx_buffer->count + sizeof(struct lcs_header) +
1575 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1576 /* skb too big for current tx buffer. */
1577 __lcs_emit_txbuffer(card);
1578 if (card->tx_buffer == NULL) {
1579 /* Get new tx buffer */
1580 card->tx_buffer = lcs_get_buffer(&card->write);
1581 if (card->tx_buffer == NULL) {
1582 card->stats.tx_dropped++;
1583 rc = NETDEV_TX_BUSY;
1584 goto out;
1585 }
1586 card->tx_buffer->callback = lcs_txbuffer_cb;
1587 card->tx_buffer->count = 0;
1588 }
1589 header = (struct lcs_header *)
1590 (card->tx_buffer->data + card->tx_buffer->count);
1591 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1592 header->offset = card->tx_buffer->count;
1593 header->type = card->lan_type;
1594 header->slot = card->portno;
1595 skb_copy_from_linear_data(skb, header + 1, skb->len);
1596 spin_unlock(&card->lock);
1597 card->stats.tx_bytes += skb->len;
1598 card->stats.tx_packets++;
1599 dev_kfree_skb(skb);
1600 netif_wake_queue(card->dev);
1601 spin_lock(&card->lock);
1602 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1603 /* If this is the first tx buffer emit it immediately. */
1604 __lcs_emit_txbuffer(card);
1605out:
1606 spin_unlock(&card->lock);
1607 return rc;
1608}
1609
1610static int
1611lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1612{
1613 struct lcs_card *card;
1614 int rc;
1615
1616 LCS_DBF_TEXT(5, trace, "pktxmit");
1617 card = (struct lcs_card *) dev->ml_priv;
1618 rc = __lcs_start_xmit(card, skb, dev);
1619 return rc;
1620}
1621
1622/**
1623 * send startlan and lanstat command to make LCS device ready
1624 */
1625static int
1626lcs_startlan_auto(struct lcs_card *card)
1627{
1628 int rc;
1629
1630 LCS_DBF_TEXT(2, trace, "strtauto");
1631#ifdef CONFIG_ETHERNET
1632 card->lan_type = LCS_FRAME_TYPE_ENET;
1633 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1634 if (rc == 0)
1635 return 0;
1636
1637#endif
1638#ifdef CONFIG_FDDI
1639 card->lan_type = LCS_FRAME_TYPE_FDDI;
1640 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1641 if (rc == 0)
1642 return 0;
1643#endif
1644 return -EIO;
1645}
1646
1647static int
1648lcs_startlan(struct lcs_card *card)
1649{
1650 int rc, i;
1651
1652 LCS_DBF_TEXT(2, trace, "startlan");
1653 rc = 0;
1654 if (card->portno != LCS_INVALID_PORT_NO) {
1655 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1656 rc = lcs_startlan_auto(card);
1657 else
1658 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1659 } else {
1660 for (i = 0; i <= 16; i++) {
1661 card->portno = i;
1662 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1663 rc = lcs_send_startlan(card,
1664 LCS_INITIATOR_TCPIP);
1665 else
1666 /* autodetecting lan type */
1667 rc = lcs_startlan_auto(card);
1668 if (rc == 0)
1669 break;
1670 }
1671 }
1672 if (rc == 0)
1673 return lcs_send_lanstat(card);
1674 return rc;
1675}
1676
1677/**
1678 * LCS detect function
1679 * setup channels and make them I/O ready
1680 */
1681static int
1682lcs_detect(struct lcs_card *card)
1683{
1684 int rc = 0;
1685
1686 LCS_DBF_TEXT(2, setup, "lcsdetct");
1687 /* start/reset card */
1688 if (card->dev)
1689 netif_stop_queue(card->dev);
1690 rc = lcs_stop_channels(card);
1691 if (rc == 0) {
1692 rc = lcs_start_channels(card);
1693 if (rc == 0) {
1694 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1695 if (rc == 0)
1696 rc = lcs_startlan(card);
1697 }
1698 }
1699 if (rc == 0) {
1700 card->state = DEV_STATE_UP;
1701 } else {
1702 card->state = DEV_STATE_DOWN;
1703 card->write.state = LCS_CH_STATE_INIT;
1704 card->read.state = LCS_CH_STATE_INIT;
1705 }
1706 return rc;
1707}
1708
1709/**
1710 * LCS Stop card
1711 */
1712static int
1713lcs_stopcard(struct lcs_card *card)
1714{
1715 int rc;
1716
1717 LCS_DBF_TEXT(3, setup, "stopcard");
1718
1719 if (card->read.state != LCS_CH_STATE_STOPPED &&
1720 card->write.state != LCS_CH_STATE_STOPPED &&
1721 card->read.state != LCS_CH_STATE_ERROR &&
1722 card->write.state != LCS_CH_STATE_ERROR &&
1723 card->state == DEV_STATE_UP) {
1724 lcs_clear_multicast_list(card);
1725 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1726 rc = lcs_send_shutdown(card);
1727 }
1728 rc = lcs_stop_channels(card);
1729 card->state = DEV_STATE_DOWN;
1730
1731 return rc;
1732}
1733
1734/**
1735 * Kernel Thread helper functions for LGW initiated commands
1736 */
1737static void
1738lcs_start_kernel_thread(struct work_struct *work)
1739{
1740 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1741 LCS_DBF_TEXT(5, trace, "krnthrd");
1742 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1743 kthread_run(lcs_recovery, card, "lcs_recover");
1744#ifdef CONFIG_IP_MULTICAST
1745 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1746 kthread_run(lcs_register_mc_addresses, card, "regipm");
1747#endif
1748}
1749
1750/**
1751 * Process control frames.
1752 */
1753static void
1754lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1755{
1756 LCS_DBF_TEXT(5, trace, "getctrl");
1757 if (cmd->initiator == LCS_INITIATOR_LGW) {
1758 switch(cmd->cmd_code) {
1759 case LCS_CMD_STARTUP:
1760 case LCS_CMD_STARTLAN:
1761 lcs_schedule_recovery(card);
1762 break;
1763 case LCS_CMD_STOPLAN:
1764 pr_warn("Stoplan for %s initiated by LGW\n",
1765 card->dev->name);
1766 if (card->dev)
1767 netif_carrier_off(card->dev);
1768 break;
1769 default:
1770 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1771 break;
1772 }
1773 } else
1774 lcs_notify_lancmd_waiters(card, cmd);
1775}
1776
1777/**
1778 * Unpack network packet.
1779 */
1780static void
1781lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1782{
1783 struct sk_buff *skb;
1784
1785 LCS_DBF_TEXT(5, trace, "getskb");
1786 if (card->dev == NULL ||
1787 card->state != DEV_STATE_UP)
1788 /* The card isn't up. Ignore the packet. */
1789 return;
1790
1791 skb = dev_alloc_skb(skb_len);
1792 if (skb == NULL) {
1793 dev_err(&card->dev->dev,
1794 " Allocating a socket buffer to interface %s failed\n",
1795 card->dev->name);
1796 card->stats.rx_dropped++;
1797 return;
1798 }
1799 memcpy(skb_put(skb, skb_len), skb_data, skb_len);
1800 skb->protocol = card->lan_type_trans(skb, card->dev);
1801 card->stats.rx_bytes += skb_len;
1802 card->stats.rx_packets++;
1803 if (skb->protocol == htons(ETH_P_802_2))
1804 *((__u32 *)skb->cb) = ++card->pkt_seq;
1805 netif_rx(skb);
1806}
1807
1808/**
1809 * LCS main routine to get packets and lancmd replies from the buffers
1810 */
1811static void
1812lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1813{
1814 struct lcs_card *card;
1815 struct lcs_header *lcs_hdr;
1816 __u16 offset;
1817
1818 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1819 lcs_hdr = (struct lcs_header *) buffer->data;
1820 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1821 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1822 return;
1823 }
1824 card = container_of(channel, struct lcs_card, read);
1825 offset = 0;
1826 while (lcs_hdr->offset != 0) {
1827 if (lcs_hdr->offset <= 0 ||
1828 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1829 lcs_hdr->offset < offset) {
1830 /* Offset invalid. */
1831 card->stats.rx_length_errors++;
1832 card->stats.rx_errors++;
1833 return;
1834 }
1835 /* What kind of frame is it? */
1836 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1837 /* Control frame. */
1838 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1839 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1840 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1841 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1842 /* Normal network packet. */
1843 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1844 lcs_hdr->offset - offset -
1845 sizeof(struct lcs_header));
1846 else
1847 /* Unknown frame type. */
1848 ; // FIXME: error message ?
1849 /* Proceed to next frame. */
1850 offset = lcs_hdr->offset;
1851 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1852 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1853 }
1854 /* The buffer is now empty. Make it ready again. */
1855 lcs_ready_buffer(&card->read, buffer);
1856}
1857
1858/**
1859 * get network statistics for ifconfig and other user programs
1860 */
1861static struct net_device_stats *
1862lcs_getstats(struct net_device *dev)
1863{
1864 struct lcs_card *card;
1865
1866 LCS_DBF_TEXT(4, trace, "netstats");
1867 card = (struct lcs_card *) dev->ml_priv;
1868 return &card->stats;
1869}
1870
1871/**
1872 * stop lcs device
1873 * This function will be called by user doing ifconfig xxx down
1874 */
1875static int
1876lcs_stop_device(struct net_device *dev)
1877{
1878 struct lcs_card *card;
1879 int rc;
1880
1881 LCS_DBF_TEXT(2, trace, "stopdev");
1882 card = (struct lcs_card *) dev->ml_priv;
1883 netif_carrier_off(dev);
1884 netif_tx_disable(dev);
1885 dev->flags &= ~IFF_UP;
1886 wait_event(card->write.wait_q,
1887 (card->write.state != LCS_CH_STATE_RUNNING));
1888 rc = lcs_stopcard(card);
1889 if (rc)
1890 dev_err(&card->dev->dev,
1891 " Shutting down the LCS device failed\n ");
1892 return rc;
1893}
1894
1895/**
1896 * start lcs device and make it runnable
1897 * This function will be called by user doing ifconfig xxx up
1898 */
1899static int
1900lcs_open_device(struct net_device *dev)
1901{
1902 struct lcs_card *card;
1903 int rc;
1904
1905 LCS_DBF_TEXT(2, trace, "opendev");
1906 card = (struct lcs_card *) dev->ml_priv;
1907 /* initialize statistics */
1908 rc = lcs_detect(card);
1909 if (rc) {
1910 pr_err("Error in opening device!\n");
1911
1912 } else {
1913 dev->flags |= IFF_UP;
1914 netif_carrier_on(dev);
1915 netif_wake_queue(dev);
1916 card->state = DEV_STATE_UP;
1917 }
1918 return rc;
1919}
1920
1921/**
1922 * show function for portno called by cat or similar things
1923 */
1924static ssize_t
1925lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1926{
1927 struct lcs_card *card;
1928
1929 card = dev_get_drvdata(dev);
1930
1931 if (!card)
1932 return 0;
1933
1934 return sprintf(buf, "%d\n", card->portno);
1935}
1936
1937/**
1938 * store the value which is piped to file portno
1939 */
1940static ssize_t
1941lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1942{
1943 struct lcs_card *card;
1944 int rc;
1945 s16 value;
1946
1947 card = dev_get_drvdata(dev);
1948
1949 if (!card)
1950 return 0;
1951
1952 rc = kstrtos16(buf, 0, &value);
1953 if (rc)
1954 return -EINVAL;
1955 /* TODO: sanity checks */
1956 card->portno = value;
1957
1958 return count;
1959
1960}
1961
1962static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1963
1964static const char *lcs_type[] = {
1965 "not a channel",
1966 "2216 parallel",
1967 "2216 channel",
1968 "OSA LCS card",
1969 "unknown channel type",
1970 "unsupported channel type",
1971};
1972
1973static ssize_t
1974lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1975{
1976 struct ccwgroup_device *cgdev;
1977
1978 cgdev = to_ccwgroupdev(dev);
1979 if (!cgdev)
1980 return -ENODEV;
1981
1982 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1983}
1984
1985static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1986
1987static ssize_t
1988lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1989{
1990 struct lcs_card *card;
1991
1992 card = dev_get_drvdata(dev);
1993
1994 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1995}
1996
1997static ssize_t
1998lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1999{
2000 struct lcs_card *card;
2001 unsigned int value;
2002 int rc;
2003
2004 card = dev_get_drvdata(dev);
2005
2006 if (!card)
2007 return 0;
2008
2009 rc = kstrtouint(buf, 0, &value);
2010 if (rc)
2011 return -EINVAL;
2012 /* TODO: sanity checks */
2013 card->lancmd_timeout = value;
2014
2015 return count;
2016
2017}
2018
2019static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
2020
2021static ssize_t
2022lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
2023 const char *buf, size_t count)
2024{
2025 struct lcs_card *card = dev_get_drvdata(dev);
2026 char *tmp;
2027 int i;
2028
2029 if (!card)
2030 return -EINVAL;
2031 if (card->state != DEV_STATE_UP)
2032 return -EPERM;
2033 i = simple_strtoul(buf, &tmp, 16);
2034 if (i == 1)
2035 lcs_schedule_recovery(card);
2036 return count;
2037}
2038
2039static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2040
2041static struct attribute * lcs_attrs[] = {
2042 &dev_attr_portno.attr,
2043 &dev_attr_type.attr,
2044 &dev_attr_lancmd_timeout.attr,
2045 &dev_attr_recover.attr,
2046 NULL,
2047};
2048static struct attribute_group lcs_attr_group = {
2049 .attrs = lcs_attrs,
2050};
2051static const struct attribute_group *lcs_attr_groups[] = {
2052 &lcs_attr_group,
2053 NULL,
2054};
2055static const struct device_type lcs_devtype = {
2056 .name = "lcs",
2057 .groups = lcs_attr_groups,
2058};
2059
2060/**
2061 * lcs_probe_device is called on establishing a new ccwgroup_device.
2062 */
2063static int
2064lcs_probe_device(struct ccwgroup_device *ccwgdev)
2065{
2066 struct lcs_card *card;
2067
2068 if (!get_device(&ccwgdev->dev))
2069 return -ENODEV;
2070
2071 LCS_DBF_TEXT(2, setup, "add_dev");
2072 card = lcs_alloc_card();
2073 if (!card) {
2074 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2075 put_device(&ccwgdev->dev);
2076 return -ENOMEM;
2077 }
2078 dev_set_drvdata(&ccwgdev->dev, card);
2079 ccwgdev->cdev[0]->handler = lcs_irq;
2080 ccwgdev->cdev[1]->handler = lcs_irq;
2081 card->gdev = ccwgdev;
2082 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2083 card->thread_start_mask = 0;
2084 card->thread_allowed_mask = 0;
2085 card->thread_running_mask = 0;
2086 ccwgdev->dev.type = &lcs_devtype;
2087
2088 return 0;
2089}
2090
2091static int
2092lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2093{
2094 struct lcs_card *card;
2095
2096 LCS_DBF_TEXT(2, setup, "regnetdv");
2097 card = dev_get_drvdata(&ccwgdev->dev);
2098 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2099 return 0;
2100 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2101 return register_netdev(card->dev);
2102}
2103
2104/**
2105 * lcs_new_device will be called by setting the group device online.
2106 */
2107static const struct net_device_ops lcs_netdev_ops = {
2108 .ndo_open = lcs_open_device,
2109 .ndo_stop = lcs_stop_device,
2110 .ndo_get_stats = lcs_getstats,
2111 .ndo_start_xmit = lcs_start_xmit,
2112};
2113
2114static const struct net_device_ops lcs_mc_netdev_ops = {
2115 .ndo_open = lcs_open_device,
2116 .ndo_stop = lcs_stop_device,
2117 .ndo_get_stats = lcs_getstats,
2118 .ndo_start_xmit = lcs_start_xmit,
2119 .ndo_set_rx_mode = lcs_set_multicast_list,
2120};
2121
2122static int
2123lcs_new_device(struct ccwgroup_device *ccwgdev)
2124{
2125 struct lcs_card *card;
2126 struct net_device *dev=NULL;
2127 enum lcs_dev_states recover_state;
2128 int rc;
2129
2130 card = dev_get_drvdata(&ccwgdev->dev);
2131 if (!card)
2132 return -ENODEV;
2133
2134 LCS_DBF_TEXT(2, setup, "newdev");
2135 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2136 card->read.ccwdev = ccwgdev->cdev[0];
2137 card->write.ccwdev = ccwgdev->cdev[1];
2138
2139 recover_state = card->state;
2140 rc = ccw_device_set_online(card->read.ccwdev);
2141 if (rc)
2142 goto out_err;
2143 rc = ccw_device_set_online(card->write.ccwdev);
2144 if (rc)
2145 goto out_werr;
2146
2147 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2148
2149 lcs_setup_card(card);
2150 rc = lcs_detect(card);
2151 if (rc) {
2152 LCS_DBF_TEXT(2, setup, "dtctfail");
2153 dev_err(&ccwgdev->dev,
2154 "Detecting a network adapter for LCS devices"
2155 " failed with rc=%d (0x%x)\n", rc, rc);
2156 lcs_stopcard(card);
2157 goto out;
2158 }
2159 if (card->dev) {
2160 LCS_DBF_TEXT(2, setup, "samedev");
2161 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2162 goto netdev_out;
2163 }
2164 switch (card->lan_type) {
2165#ifdef CONFIG_ETHERNET
2166 case LCS_FRAME_TYPE_ENET:
2167 card->lan_type_trans = eth_type_trans;
2168 dev = alloc_etherdev(0);
2169 break;
2170#endif
2171#ifdef CONFIG_FDDI
2172 case LCS_FRAME_TYPE_FDDI:
2173 card->lan_type_trans = fddi_type_trans;
2174 dev = alloc_fddidev(0);
2175 break;
2176#endif
2177 default:
2178 LCS_DBF_TEXT(3, setup, "errinit");
2179 pr_err(" Initialization failed\n");
2180 goto out;
2181 }
2182 if (!dev)
2183 goto out;
2184 card->dev = dev;
2185 card->dev->ml_priv = card;
2186 card->dev->netdev_ops = &lcs_netdev_ops;
2187 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2188#ifdef CONFIG_IP_MULTICAST
2189 if (!lcs_check_multicast_support(card))
2190 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2191#endif
2192netdev_out:
2193 lcs_set_allowed_threads(card,0xffffffff);
2194 if (recover_state == DEV_STATE_RECOVER) {
2195 lcs_set_multicast_list(card->dev);
2196 card->dev->flags |= IFF_UP;
2197 netif_carrier_on(card->dev);
2198 netif_wake_queue(card->dev);
2199 card->state = DEV_STATE_UP;
2200 } else {
2201 lcs_stopcard(card);
2202 }
2203
2204 if (lcs_register_netdev(ccwgdev) != 0)
2205 goto out;
2206
2207 /* Print out supported assists: IPv6 */
2208 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2209 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2210 "with" : "without");
2211 /* Print out supported assist: Multicast */
2212 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2213 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2214 "with" : "without");
2215 return 0;
2216out:
2217
2218 ccw_device_set_offline(card->write.ccwdev);
2219out_werr:
2220 ccw_device_set_offline(card->read.ccwdev);
2221out_err:
2222 return -ENODEV;
2223}
2224
2225/**
2226 * lcs_shutdown_device, called when setting the group device offline.
2227 */
2228static int
2229__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2230{
2231 struct lcs_card *card;
2232 enum lcs_dev_states recover_state;
2233 int ret = 0, ret2 = 0, ret3 = 0;
2234
2235 LCS_DBF_TEXT(3, setup, "shtdndev");
2236 card = dev_get_drvdata(&ccwgdev->dev);
2237 if (!card)
2238 return -ENODEV;
2239 if (recovery_mode == 0) {
2240 lcs_set_allowed_threads(card, 0);
2241 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2242 return -ERESTARTSYS;
2243 }
2244 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2245 recover_state = card->state;
2246
2247 ret = lcs_stop_device(card->dev);
2248 ret2 = ccw_device_set_offline(card->read.ccwdev);
2249 ret3 = ccw_device_set_offline(card->write.ccwdev);
2250 if (!ret)
2251 ret = (ret2) ? ret2 : ret3;
2252 if (ret)
2253 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2254 if (recover_state == DEV_STATE_UP) {
2255 card->state = DEV_STATE_RECOVER;
2256 }
2257 return 0;
2258}
2259
2260static int
2261lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2262{
2263 return __lcs_shutdown_device(ccwgdev, 0);
2264}
2265
2266/**
2267 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2268 */
2269static int
2270lcs_recovery(void *ptr)
2271{
2272 struct lcs_card *card;
2273 struct ccwgroup_device *gdev;
2274 int rc;
2275
2276 card = (struct lcs_card *) ptr;
2277
2278 LCS_DBF_TEXT(4, trace, "recover1");
2279 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2280 return 0;
2281 LCS_DBF_TEXT(4, trace, "recover2");
2282 gdev = card->gdev;
2283 dev_warn(&gdev->dev,
2284 "A recovery process has been started for the LCS device\n");
2285 rc = __lcs_shutdown_device(gdev, 1);
2286 rc = lcs_new_device(gdev);
2287 if (!rc)
2288 pr_info("Device %s successfully recovered!\n",
2289 card->dev->name);
2290 else
2291 pr_info("Device %s could not be recovered!\n",
2292 card->dev->name);
2293 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2294 return 0;
2295}
2296
2297/**
2298 * lcs_remove_device, free buffers and card
2299 */
2300static void
2301lcs_remove_device(struct ccwgroup_device *ccwgdev)
2302{
2303 struct lcs_card *card;
2304
2305 card = dev_get_drvdata(&ccwgdev->dev);
2306 if (!card)
2307 return;
2308
2309 LCS_DBF_TEXT(3, setup, "remdev");
2310 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2311 if (ccwgdev->state == CCWGROUP_ONLINE) {
2312 lcs_shutdown_device(ccwgdev);
2313 }
2314 if (card->dev)
2315 unregister_netdev(card->dev);
2316 lcs_cleanup_card(card);
2317 lcs_free_card(card);
2318 dev_set_drvdata(&ccwgdev->dev, NULL);
2319 put_device(&ccwgdev->dev);
2320}
2321
2322static int lcs_pm_suspend(struct lcs_card *card)
2323{
2324 if (card->dev)
2325 netif_device_detach(card->dev);
2326 lcs_set_allowed_threads(card, 0);
2327 lcs_wait_for_threads(card, 0xffffffff);
2328 if (card->state != DEV_STATE_DOWN)
2329 __lcs_shutdown_device(card->gdev, 1);
2330 return 0;
2331}
2332
2333static int lcs_pm_resume(struct lcs_card *card)
2334{
2335 int rc = 0;
2336
2337 if (card->state == DEV_STATE_RECOVER)
2338 rc = lcs_new_device(card->gdev);
2339 if (card->dev)
2340 netif_device_attach(card->dev);
2341 if (rc) {
2342 dev_warn(&card->gdev->dev, "The lcs device driver "
2343 "failed to recover the device\n");
2344 }
2345 return rc;
2346}
2347
2348static int lcs_prepare(struct ccwgroup_device *gdev)
2349{
2350 return 0;
2351}
2352
2353static void lcs_complete(struct ccwgroup_device *gdev)
2354{
2355 return;
2356}
2357
2358static int lcs_freeze(struct ccwgroup_device *gdev)
2359{
2360 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2361 return lcs_pm_suspend(card);
2362}
2363
2364static int lcs_thaw(struct ccwgroup_device *gdev)
2365{
2366 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2367 return lcs_pm_resume(card);
2368}
2369
2370static int lcs_restore(struct ccwgroup_device *gdev)
2371{
2372 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2373 return lcs_pm_resume(card);
2374}
2375
2376static struct ccw_device_id lcs_ids[] = {
2377 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2378 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2379 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2380 {},
2381};
2382MODULE_DEVICE_TABLE(ccw, lcs_ids);
2383
2384static struct ccw_driver lcs_ccw_driver = {
2385 .driver = {
2386 .owner = THIS_MODULE,
2387 .name = "lcs",
2388 },
2389 .ids = lcs_ids,
2390 .probe = ccwgroup_probe_ccwdev,
2391 .remove = ccwgroup_remove_ccwdev,
2392 .int_class = IRQIO_LCS,
2393};
2394
2395/**
2396 * LCS ccwgroup driver registration
2397 */
2398static struct ccwgroup_driver lcs_group_driver = {
2399 .driver = {
2400 .owner = THIS_MODULE,
2401 .name = "lcs",
2402 },
2403 .setup = lcs_probe_device,
2404 .remove = lcs_remove_device,
2405 .set_online = lcs_new_device,
2406 .set_offline = lcs_shutdown_device,
2407 .prepare = lcs_prepare,
2408 .complete = lcs_complete,
2409 .freeze = lcs_freeze,
2410 .thaw = lcs_thaw,
2411 .restore = lcs_restore,
2412};
2413
2414static ssize_t lcs_driver_group_store(struct device_driver *ddrv,
2415 const char *buf, size_t count)
2416{
2417 int err;
2418 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2419 return err ? err : count;
2420}
2421static DRIVER_ATTR(group, 0200, NULL, lcs_driver_group_store);
2422
2423static struct attribute *lcs_drv_attrs[] = {
2424 &driver_attr_group.attr,
2425 NULL,
2426};
2427static struct attribute_group lcs_drv_attr_group = {
2428 .attrs = lcs_drv_attrs,
2429};
2430static const struct attribute_group *lcs_drv_attr_groups[] = {
2431 &lcs_drv_attr_group,
2432 NULL,
2433};
2434
2435/**
2436 * LCS Module/Kernel initialization function
2437 */
2438static int
2439__init lcs_init_module(void)
2440{
2441 int rc;
2442
2443 pr_info("Loading %s\n", version);
2444 rc = lcs_register_debug_facility();
2445 LCS_DBF_TEXT(0, setup, "lcsinit");
2446 if (rc)
2447 goto out_err;
2448 lcs_root_dev = root_device_register("lcs");
2449 rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2450 if (rc)
2451 goto register_err;
2452 rc = ccw_driver_register(&lcs_ccw_driver);
2453 if (rc)
2454 goto ccw_err;
2455 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2456 rc = ccwgroup_driver_register(&lcs_group_driver);
2457 if (rc)
2458 goto ccwgroup_err;
2459 return 0;
2460
2461ccwgroup_err:
2462 ccw_driver_unregister(&lcs_ccw_driver);
2463ccw_err:
2464 root_device_unregister(lcs_root_dev);
2465register_err:
2466 lcs_unregister_debug_facility();
2467out_err:
2468 pr_err("Initializing the lcs device driver failed\n");
2469 return rc;
2470}
2471
2472
2473/**
2474 * LCS module cleanup function
2475 */
2476static void
2477__exit lcs_cleanup_module(void)
2478{
2479 pr_info("Terminating lcs module.\n");
2480 LCS_DBF_TEXT(0, trace, "cleanup");
2481 ccwgroup_driver_unregister(&lcs_group_driver);
2482 ccw_driver_unregister(&lcs_ccw_driver);
2483 root_device_unregister(lcs_root_dev);
2484 lcs_unregister_debug_facility();
2485}
2486
2487module_init(lcs_init_module);
2488module_exit(lcs_cleanup_module);
2489
2490MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2491MODULE_LICENSE("GPL");
2492