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