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