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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 device 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 virt_to_dma32(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 = virt_to_dma32(card->read.ccws);
234 /* Setg initial state of the read channel. */
235 card->read.state = LCS_CH_STATE_INIT;
236
237 card->read.io_idx = 0;
238 card->read.buf_idx = 0;
239}
240
241static void
242lcs_setup_read(struct lcs_card *card)
243{
244 LCS_DBF_TEXT(3, setup, "initread");
245
246 lcs_setup_read_ccws(card);
247 /* Initialize read channel tasklet. */
248 card->read.irq_tasklet.data = (unsigned long) &card->read;
249 card->read.irq_tasklet.func = lcs_tasklet;
250 /* Initialize waitqueue. */
251 init_waitqueue_head(&card->read.wait_q);
252}
253
254/*
255 * Setup write channel.
256 */
257static void
258lcs_setup_write_ccws(struct lcs_card *card)
259{
260 int cnt;
261
262 LCS_DBF_TEXT(3, setup, "iwritccw");
263 /* Setup write ccws. */
264 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
265 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
266 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
267 card->write.ccws[cnt].count = 0;
268 card->write.ccws[cnt].flags =
269 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
270 /*
271 * Note: we have allocated the buffer with GFP_DMA, so
272 * we do not need to do set_normalized_cda.
273 */
274 card->write.ccws[cnt].cda =
275 virt_to_dma32(card->write.iob[cnt].data);
276 }
277 /* Last ccw is a tic (transfer in channel). */
278 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
279 card->write.ccws[LCS_NUM_BUFFS].cda = virt_to_dma32(card->write.ccws);
280 /* Set initial state of the write channel. */
281 card->read.state = LCS_CH_STATE_INIT;
282
283 card->write.io_idx = 0;
284 card->write.buf_idx = 0;
285}
286
287static void
288lcs_setup_write(struct lcs_card *card)
289{
290 LCS_DBF_TEXT(3, setup, "initwrit");
291
292 lcs_setup_write_ccws(card);
293 /* Initialize write channel tasklet. */
294 card->write.irq_tasklet.data = (unsigned long) &card->write;
295 card->write.irq_tasklet.func = lcs_tasklet;
296 /* Initialize waitqueue. */
297 init_waitqueue_head(&card->write.wait_q);
298}
299
300static void
301lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
302{
303 unsigned long flags;
304
305 spin_lock_irqsave(&card->mask_lock, flags);
306 card->thread_allowed_mask = threads;
307 spin_unlock_irqrestore(&card->mask_lock, flags);
308 wake_up(&card->wait_q);
309}
310static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
311{
312 unsigned long flags;
313 int rc = 0;
314
315 spin_lock_irqsave(&card->mask_lock, flags);
316 rc = (card->thread_running_mask & threads);
317 spin_unlock_irqrestore(&card->mask_lock, flags);
318 return rc;
319}
320
321static int
322lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
323{
324 return wait_event_interruptible(card->wait_q,
325 lcs_threads_running(card, threads) == 0);
326}
327
328static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
329{
330 unsigned long flags;
331
332 spin_lock_irqsave(&card->mask_lock, flags);
333 if ( !(card->thread_allowed_mask & thread) ||
334 (card->thread_start_mask & thread) ) {
335 spin_unlock_irqrestore(&card->mask_lock, flags);
336 return -EPERM;
337 }
338 card->thread_start_mask |= thread;
339 spin_unlock_irqrestore(&card->mask_lock, flags);
340 return 0;
341}
342
343static void
344lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
345{
346 unsigned long flags;
347
348 spin_lock_irqsave(&card->mask_lock, flags);
349 card->thread_running_mask &= ~thread;
350 spin_unlock_irqrestore(&card->mask_lock, flags);
351 wake_up(&card->wait_q);
352}
353
354static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
355{
356 unsigned long flags;
357 int rc = 0;
358
359 spin_lock_irqsave(&card->mask_lock, flags);
360 if (card->thread_start_mask & thread){
361 if ((card->thread_allowed_mask & thread) &&
362 !(card->thread_running_mask & thread)){
363 rc = 1;
364 card->thread_start_mask &= ~thread;
365 card->thread_running_mask |= thread;
366 } else
367 rc = -EPERM;
368 }
369 spin_unlock_irqrestore(&card->mask_lock, flags);
370 return rc;
371}
372
373static int
374lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
375{
376 int rc = 0;
377 wait_event(card->wait_q,
378 (rc = __lcs_do_run_thread(card, thread)) >= 0);
379 return rc;
380}
381
382static int
383lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
384{
385 unsigned long flags;
386 int rc = 0;
387
388 spin_lock_irqsave(&card->mask_lock, flags);
389 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
390 (u8) card->thread_start_mask,
391 (u8) card->thread_allowed_mask,
392 (u8) card->thread_running_mask);
393 rc = (card->thread_start_mask & thread);
394 spin_unlock_irqrestore(&card->mask_lock, flags);
395 return rc;
396}
397
398/*
399 * Initialize channels,card and state machines.
400 */
401static void
402lcs_setup_card(struct lcs_card *card)
403{
404 LCS_DBF_TEXT(2, setup, "initcard");
405 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
406
407 lcs_setup_read(card);
408 lcs_setup_write(card);
409 /* Set cards initial state. */
410 card->state = DEV_STATE_DOWN;
411 card->tx_buffer = NULL;
412 card->tx_emitted = 0;
413
414 init_waitqueue_head(&card->wait_q);
415 spin_lock_init(&card->lock);
416 spin_lock_init(&card->ipm_lock);
417 spin_lock_init(&card->mask_lock);
418#ifdef CONFIG_IP_MULTICAST
419 INIT_LIST_HEAD(&card->ipm_list);
420#endif
421 INIT_LIST_HEAD(&card->lancmd_waiters);
422}
423
424static void lcs_clear_multicast_list(struct lcs_card *card)
425{
426#ifdef CONFIG_IP_MULTICAST
427 struct lcs_ipm_list *ipm;
428 unsigned long flags;
429
430 /* Free multicast list. */
431 LCS_DBF_TEXT(3, setup, "clmclist");
432 spin_lock_irqsave(&card->ipm_lock, flags);
433 while (!list_empty(&card->ipm_list)){
434 ipm = list_entry(card->ipm_list.next,
435 struct lcs_ipm_list, list);
436 list_del(&ipm->list);
437 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
438 spin_unlock_irqrestore(&card->ipm_lock, flags);
439 lcs_send_delipm(card, ipm);
440 spin_lock_irqsave(&card->ipm_lock, flags);
441 }
442 kfree(ipm);
443 }
444 spin_unlock_irqrestore(&card->ipm_lock, flags);
445#endif
446}
447
448/*
449 * Cleanup channels,card and state machines.
450 */
451static void
452lcs_cleanup_card(struct lcs_card *card)
453{
454
455 LCS_DBF_TEXT(3, setup, "cleancrd");
456 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
457
458 if (card->dev != NULL)
459 free_netdev(card->dev);
460 /* Cleanup channels. */
461 lcs_cleanup_channel(&card->write);
462 lcs_cleanup_channel(&card->read);
463}
464
465/*
466 * Start channel.
467 */
468static int
469lcs_start_channel(struct lcs_channel *channel)
470{
471 unsigned long flags;
472 int rc;
473
474 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
475 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
476 rc = ccw_device_start(channel->ccwdev,
477 channel->ccws + channel->io_idx, 0, 0,
478 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
479 if (rc == 0)
480 channel->state = LCS_CH_STATE_RUNNING;
481 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
482 if (rc) {
483 LCS_DBF_TEXT_(4,trace,"essh%s",
484 dev_name(&channel->ccwdev->dev));
485 dev_err(&channel->ccwdev->dev,
486 "Starting an LCS device resulted in an error,"
487 " rc=%d!\n", rc);
488 }
489 return rc;
490}
491
492static int
493lcs_clear_channel(struct lcs_channel *channel)
494{
495 unsigned long flags;
496 int rc;
497
498 LCS_DBF_TEXT(4,trace,"clearch");
499 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
500 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
501 rc = ccw_device_clear(channel->ccwdev, 0);
502 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
503 if (rc) {
504 LCS_DBF_TEXT_(4, trace, "ecsc%s",
505 dev_name(&channel->ccwdev->dev));
506 return rc;
507 }
508 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
509 channel->state = LCS_CH_STATE_STOPPED;
510 return rc;
511}
512
513
514/*
515 * Stop channel.
516 */
517static int
518lcs_stop_channel(struct lcs_channel *channel)
519{
520 unsigned long flags;
521 int rc;
522
523 if (channel->state == LCS_CH_STATE_STOPPED)
524 return 0;
525 LCS_DBF_TEXT(4,trace,"haltsch");
526 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
527 channel->state = LCS_CH_STATE_INIT;
528 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
529 rc = ccw_device_halt(channel->ccwdev, 0);
530 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
531 if (rc) {
532 LCS_DBF_TEXT_(4, trace, "ehsc%s",
533 dev_name(&channel->ccwdev->dev));
534 return rc;
535 }
536 /* Asynchronous halt initialted. Wait for its completion. */
537 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
538 lcs_clear_channel(channel);
539 return 0;
540}
541
542/*
543 * start read and write channel
544 */
545static int
546lcs_start_channels(struct lcs_card *card)
547{
548 int rc;
549
550 LCS_DBF_TEXT(2, trace, "chstart");
551 /* start read channel */
552 rc = lcs_start_channel(&card->read);
553 if (rc)
554 return rc;
555 /* start write channel */
556 rc = lcs_start_channel(&card->write);
557 if (rc)
558 lcs_stop_channel(&card->read);
559 return rc;
560}
561
562/*
563 * stop read and write channel
564 */
565static int
566lcs_stop_channels(struct lcs_card *card)
567{
568 LCS_DBF_TEXT(2, trace, "chhalt");
569 lcs_stop_channel(&card->read);
570 lcs_stop_channel(&card->write);
571 return 0;
572}
573
574/*
575 * Get empty buffer.
576 */
577static struct lcs_buffer *
578__lcs_get_buffer(struct lcs_channel *channel)
579{
580 int index;
581
582 LCS_DBF_TEXT(5, trace, "_getbuff");
583 index = channel->io_idx;
584 do {
585 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
586 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
587 return channel->iob + index;
588 }
589 index = (index + 1) & (LCS_NUM_BUFFS - 1);
590 } while (index != channel->io_idx);
591 return NULL;
592}
593
594static struct lcs_buffer *
595lcs_get_buffer(struct lcs_channel *channel)
596{
597 struct lcs_buffer *buffer;
598 unsigned long flags;
599
600 LCS_DBF_TEXT(5, trace, "getbuff");
601 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
602 buffer = __lcs_get_buffer(channel);
603 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
604 return buffer;
605}
606
607/*
608 * Resume channel program if the channel is suspended.
609 */
610static int
611__lcs_resume_channel(struct lcs_channel *channel)
612{
613 int rc;
614
615 if (channel->state != LCS_CH_STATE_SUSPENDED)
616 return 0;
617 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
618 return 0;
619 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
620 rc = ccw_device_resume(channel->ccwdev);
621 if (rc) {
622 LCS_DBF_TEXT_(4, trace, "ersc%s",
623 dev_name(&channel->ccwdev->dev));
624 dev_err(&channel->ccwdev->dev,
625 "Sending data from the LCS device to the LAN failed"
626 " with rc=%d\n",rc);
627 } else
628 channel->state = LCS_CH_STATE_RUNNING;
629 return rc;
630
631}
632
633/*
634 * Make a buffer ready for processing.
635 */
636static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
637{
638 int prev, next;
639
640 LCS_DBF_TEXT(5, trace, "rdybits");
641 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
642 next = (index + 1) & (LCS_NUM_BUFFS - 1);
643 /* Check if we may clear the suspend bit of this buffer. */
644 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
645 /* Check if we have to set the PCI bit. */
646 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
647 /* Suspend bit of the previous buffer is not set. */
648 channel->ccws[index].flags |= CCW_FLAG_PCI;
649 /* Suspend bit of the next buffer is set. */
650 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
651 }
652}
653
654static int
655lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
656{
657 unsigned long flags;
658 int index, rc;
659
660 LCS_DBF_TEXT(5, trace, "rdybuff");
661 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
662 buffer->state != LCS_BUF_STATE_PROCESSED);
663 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
664 buffer->state = LCS_BUF_STATE_READY;
665 index = buffer - channel->iob;
666 /* Set length. */
667 channel->ccws[index].count = buffer->count;
668 /* Check relevant PCI/suspend bits. */
669 __lcs_ready_buffer_bits(channel, index);
670 rc = __lcs_resume_channel(channel);
671 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
672 return rc;
673}
674
675/*
676 * Mark the buffer as processed. Take care of the suspend bit
677 * of the previous buffer. This function is called from
678 * interrupt context, so the lock must not be taken.
679 */
680static int
681__lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
682{
683 int index, prev, next;
684
685 LCS_DBF_TEXT(5, trace, "prcsbuff");
686 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
687 buffer->state = LCS_BUF_STATE_PROCESSED;
688 index = buffer - channel->iob;
689 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
690 next = (index + 1) & (LCS_NUM_BUFFS - 1);
691 /* Set the suspend bit and clear the PCI bit of this buffer. */
692 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
693 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
694 /* Check the suspend bit of the previous buffer. */
695 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
696 /*
697 * Previous buffer is in state ready. It might have
698 * happened in lcs_ready_buffer that the suspend bit
699 * has not been cleared to avoid an endless loop.
700 * Do it now.
701 */
702 __lcs_ready_buffer_bits(channel, prev);
703 }
704 /* Clear PCI bit of next buffer. */
705 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
706 return __lcs_resume_channel(channel);
707}
708
709/*
710 * Put a processed buffer back to state empty.
711 */
712static void
713lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
714{
715 unsigned long flags;
716
717 LCS_DBF_TEXT(5, trace, "relbuff");
718 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
719 buffer->state != LCS_BUF_STATE_PROCESSED);
720 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
721 buffer->state = LCS_BUF_STATE_EMPTY;
722 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
723}
724
725/*
726 * Get buffer for a lan command.
727 */
728static struct lcs_buffer *
729lcs_get_lancmd(struct lcs_card *card, int count)
730{
731 struct lcs_buffer *buffer;
732 struct lcs_cmd *cmd;
733
734 LCS_DBF_TEXT(4, trace, "getlncmd");
735 /* Get buffer and wait if none is available. */
736 wait_event(card->write.wait_q,
737 ((buffer = lcs_get_buffer(&card->write)) != NULL));
738 count += sizeof(struct lcs_header);
739 *(__u16 *)(buffer->data + count) = 0;
740 buffer->count = count + sizeof(__u16);
741 buffer->callback = lcs_release_buffer;
742 cmd = (struct lcs_cmd *) buffer->data;
743 cmd->offset = count;
744 cmd->type = LCS_FRAME_TYPE_CONTROL;
745 cmd->slot = 0;
746 return buffer;
747}
748
749
750static void
751lcs_get_reply(struct lcs_reply *reply)
752{
753 refcount_inc(&reply->refcnt);
754}
755
756static void
757lcs_put_reply(struct lcs_reply *reply)
758{
759 if (refcount_dec_and_test(&reply->refcnt))
760 kfree(reply);
761}
762
763static struct lcs_reply *
764lcs_alloc_reply(struct lcs_cmd *cmd)
765{
766 struct lcs_reply *reply;
767
768 LCS_DBF_TEXT(4, trace, "getreply");
769
770 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
771 if (!reply)
772 return NULL;
773 refcount_set(&reply->refcnt, 1);
774 reply->sequence_no = cmd->sequence_no;
775 reply->received = 0;
776 reply->rc = 0;
777 init_waitqueue_head(&reply->wait_q);
778
779 return reply;
780}
781
782/*
783 * Notifier function for lancmd replies. Called from read irq.
784 */
785static void
786lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
787{
788 struct list_head *l, *n;
789 struct lcs_reply *reply;
790
791 LCS_DBF_TEXT(4, trace, "notiwait");
792 spin_lock(&card->lock);
793 list_for_each_safe(l, n, &card->lancmd_waiters) {
794 reply = list_entry(l, struct lcs_reply, list);
795 if (reply->sequence_no == cmd->sequence_no) {
796 lcs_get_reply(reply);
797 list_del_init(&reply->list);
798 if (reply->callback != NULL)
799 reply->callback(card, cmd);
800 reply->received = 1;
801 reply->rc = cmd->return_code;
802 wake_up(&reply->wait_q);
803 lcs_put_reply(reply);
804 break;
805 }
806 }
807 spin_unlock(&card->lock);
808}
809
810/*
811 * Emit buffer of a lan command.
812 */
813static void
814lcs_lancmd_timeout(struct timer_list *t)
815{
816 struct lcs_reply *reply = from_timer(reply, t, timer);
817 struct lcs_reply *list_reply, *r;
818 unsigned long flags;
819
820 LCS_DBF_TEXT(4, trace, "timeout");
821 spin_lock_irqsave(&reply->card->lock, flags);
822 list_for_each_entry_safe(list_reply, r,
823 &reply->card->lancmd_waiters,list) {
824 if (reply == list_reply) {
825 lcs_get_reply(reply);
826 list_del_init(&reply->list);
827 spin_unlock_irqrestore(&reply->card->lock, flags);
828 reply->received = 1;
829 reply->rc = -ETIME;
830 wake_up(&reply->wait_q);
831 lcs_put_reply(reply);
832 return;
833 }
834 }
835 spin_unlock_irqrestore(&reply->card->lock, flags);
836}
837
838static int
839lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
840 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
841{
842 struct lcs_reply *reply;
843 struct lcs_cmd *cmd;
844 unsigned long flags;
845 int rc;
846
847 LCS_DBF_TEXT(4, trace, "sendcmd");
848 cmd = (struct lcs_cmd *) buffer->data;
849 cmd->return_code = 0;
850 cmd->sequence_no = card->sequence_no++;
851 reply = lcs_alloc_reply(cmd);
852 if (!reply)
853 return -ENOMEM;
854 reply->callback = reply_callback;
855 reply->card = card;
856 spin_lock_irqsave(&card->lock, flags);
857 list_add_tail(&reply->list, &card->lancmd_waiters);
858 spin_unlock_irqrestore(&card->lock, flags);
859
860 buffer->callback = lcs_release_buffer;
861 rc = lcs_ready_buffer(&card->write, buffer);
862 if (rc)
863 return rc;
864 timer_setup(&reply->timer, lcs_lancmd_timeout, 0);
865 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);
866 wait_event(reply->wait_q, reply->received);
867 del_timer_sync(&reply->timer);
868 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
869 rc = reply->rc;
870 lcs_put_reply(reply);
871 return rc ? -EIO : 0;
872}
873
874/*
875 * LCS startup command
876 */
877static int
878lcs_send_startup(struct lcs_card *card, __u8 initiator)
879{
880 struct lcs_buffer *buffer;
881 struct lcs_cmd *cmd;
882
883 LCS_DBF_TEXT(2, trace, "startup");
884 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
885 cmd = (struct lcs_cmd *) buffer->data;
886 cmd->cmd_code = LCS_CMD_STARTUP;
887 cmd->initiator = initiator;
888 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
889 return lcs_send_lancmd(card, buffer, NULL);
890}
891
892/*
893 * LCS shutdown command
894 */
895static int
896lcs_send_shutdown(struct lcs_card *card)
897{
898 struct lcs_buffer *buffer;
899 struct lcs_cmd *cmd;
900
901 LCS_DBF_TEXT(2, trace, "shutdown");
902 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
903 cmd = (struct lcs_cmd *) buffer->data;
904 cmd->cmd_code = LCS_CMD_SHUTDOWN;
905 cmd->initiator = LCS_INITIATOR_TCPIP;
906 return lcs_send_lancmd(card, buffer, NULL);
907}
908
909/*
910 * LCS lanstat command
911 */
912static void
913__lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
914{
915 LCS_DBF_TEXT(2, trace, "statcb");
916 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
917}
918
919static int
920lcs_send_lanstat(struct lcs_card *card)
921{
922 struct lcs_buffer *buffer;
923 struct lcs_cmd *cmd;
924
925 LCS_DBF_TEXT(2,trace, "cmdstat");
926 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
927 cmd = (struct lcs_cmd *) buffer->data;
928 /* Setup lanstat command. */
929 cmd->cmd_code = LCS_CMD_LANSTAT;
930 cmd->initiator = LCS_INITIATOR_TCPIP;
931 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
932 cmd->cmd.lcs_std_cmd.portno = card->portno;
933 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
934}
935
936/*
937 * send stoplan command
938 */
939static int
940lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
941{
942 struct lcs_buffer *buffer;
943 struct lcs_cmd *cmd;
944
945 LCS_DBF_TEXT(2, trace, "cmdstpln");
946 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
947 cmd = (struct lcs_cmd *) buffer->data;
948 cmd->cmd_code = LCS_CMD_STOPLAN;
949 cmd->initiator = initiator;
950 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
951 cmd->cmd.lcs_std_cmd.portno = card->portno;
952 return lcs_send_lancmd(card, buffer, NULL);
953}
954
955/*
956 * send startlan command
957 */
958static void
959__lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
960{
961 LCS_DBF_TEXT(2, trace, "srtlancb");
962 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
963 card->portno = cmd->cmd.lcs_std_cmd.portno;
964}
965
966static int
967lcs_send_startlan(struct lcs_card *card, __u8 initiator)
968{
969 struct lcs_buffer *buffer;
970 struct lcs_cmd *cmd;
971
972 LCS_DBF_TEXT(2, trace, "cmdstaln");
973 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
974 cmd = (struct lcs_cmd *) buffer->data;
975 cmd->cmd_code = LCS_CMD_STARTLAN;
976 cmd->initiator = initiator;
977 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
978 cmd->cmd.lcs_std_cmd.portno = card->portno;
979 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
980}
981
982#ifdef CONFIG_IP_MULTICAST
983/*
984 * send setipm command (Multicast)
985 */
986static int
987lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
988{
989 struct lcs_buffer *buffer;
990 struct lcs_cmd *cmd;
991
992 LCS_DBF_TEXT(2, trace, "cmdsetim");
993 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
994 cmd = (struct lcs_cmd *) buffer->data;
995 cmd->cmd_code = LCS_CMD_SETIPM;
996 cmd->initiator = LCS_INITIATOR_TCPIP;
997 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
998 cmd->cmd.lcs_qipassist.portno = card->portno;
999 cmd->cmd.lcs_qipassist.version = 4;
1000 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1001 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1002 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1003 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1004 return lcs_send_lancmd(card, buffer, NULL);
1005}
1006
1007/*
1008 * send delipm command (Multicast)
1009 */
1010static int
1011lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1012{
1013 struct lcs_buffer *buffer;
1014 struct lcs_cmd *cmd;
1015
1016 LCS_DBF_TEXT(2, trace, "cmddelim");
1017 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1018 cmd = (struct lcs_cmd *) buffer->data;
1019 cmd->cmd_code = LCS_CMD_DELIPM;
1020 cmd->initiator = LCS_INITIATOR_TCPIP;
1021 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1022 cmd->cmd.lcs_qipassist.portno = card->portno;
1023 cmd->cmd.lcs_qipassist.version = 4;
1024 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1025 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1026 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1027 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1028 return lcs_send_lancmd(card, buffer, NULL);
1029}
1030
1031/*
1032 * check if multicast is supported by LCS
1033 */
1034static void
1035__lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1036{
1037 LCS_DBF_TEXT(2, trace, "chkmccb");
1038 card->ip_assists_supported =
1039 cmd->cmd.lcs_qipassist.ip_assists_supported;
1040 card->ip_assists_enabled =
1041 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1042}
1043
1044static int
1045lcs_check_multicast_support(struct lcs_card *card)
1046{
1047 struct lcs_buffer *buffer;
1048 struct lcs_cmd *cmd;
1049 int rc;
1050
1051 LCS_DBF_TEXT(2, trace, "cmdqipa");
1052 /* Send query ipassist. */
1053 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1054 cmd = (struct lcs_cmd *) buffer->data;
1055 cmd->cmd_code = LCS_CMD_QIPASSIST;
1056 cmd->initiator = LCS_INITIATOR_TCPIP;
1057 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1058 cmd->cmd.lcs_qipassist.portno = card->portno;
1059 cmd->cmd.lcs_qipassist.version = 4;
1060 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1061 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1062 if (rc != 0) {
1063 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1064 return -EOPNOTSUPP;
1065 }
1066 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1067 return 0;
1068 return -EOPNOTSUPP;
1069}
1070
1071/*
1072 * set or del multicast address on LCS card
1073 */
1074static void
1075lcs_fix_multicast_list(struct lcs_card *card)
1076{
1077 struct list_head failed_list;
1078 struct lcs_ipm_list *ipm, *tmp;
1079 unsigned long flags;
1080 int rc;
1081
1082 LCS_DBF_TEXT(4,trace, "fixipm");
1083 INIT_LIST_HEAD(&failed_list);
1084 spin_lock_irqsave(&card->ipm_lock, flags);
1085list_modified:
1086 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1087 switch (ipm->ipm_state) {
1088 case LCS_IPM_STATE_SET_REQUIRED:
1089 /* del from ipm_list so no one else can tamper with
1090 * this entry */
1091 list_del_init(&ipm->list);
1092 spin_unlock_irqrestore(&card->ipm_lock, flags);
1093 rc = lcs_send_setipm(card, ipm);
1094 spin_lock_irqsave(&card->ipm_lock, flags);
1095 if (rc) {
1096 pr_info("Adding multicast address failed."
1097 " Table possibly full!\n");
1098 /* store ipm in failed list -> will be added
1099 * to ipm_list again, so a retry will be done
1100 * during the next call of this function */
1101 list_add_tail(&ipm->list, &failed_list);
1102 } else {
1103 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1104 /* re-insert into ipm_list */
1105 list_add_tail(&ipm->list, &card->ipm_list);
1106 }
1107 goto list_modified;
1108 case LCS_IPM_STATE_DEL_REQUIRED:
1109 list_del(&ipm->list);
1110 spin_unlock_irqrestore(&card->ipm_lock, flags);
1111 lcs_send_delipm(card, ipm);
1112 spin_lock_irqsave(&card->ipm_lock, flags);
1113 kfree(ipm);
1114 goto list_modified;
1115 case LCS_IPM_STATE_ON_CARD:
1116 break;
1117 }
1118 }
1119 /* re-insert all entries from the failed_list into ipm_list */
1120 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1121 list_move_tail(&ipm->list, &card->ipm_list);
1122
1123 spin_unlock_irqrestore(&card->ipm_lock, flags);
1124}
1125
1126/*
1127 * get mac address for the relevant Multicast address
1128 */
1129static void
1130lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1131{
1132 LCS_DBF_TEXT(4,trace, "getmac");
1133 ip_eth_mc_map(ipm, mac);
1134}
1135
1136/*
1137 * function called by net device to handle multicast address relevant things
1138 */
1139static void lcs_remove_mc_addresses(struct lcs_card *card,
1140 struct in_device *in4_dev)
1141{
1142 struct ip_mc_list *im4;
1143 struct list_head *l;
1144 struct lcs_ipm_list *ipm;
1145 unsigned long flags;
1146 char buf[MAX_ADDR_LEN];
1147
1148 LCS_DBF_TEXT(4, trace, "remmclst");
1149 spin_lock_irqsave(&card->ipm_lock, flags);
1150 list_for_each(l, &card->ipm_list) {
1151 ipm = list_entry(l, struct lcs_ipm_list, list);
1152 for (im4 = rcu_dereference(in4_dev->mc_list);
1153 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1154 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1155 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1156 (memcmp(buf, &ipm->ipm.mac_addr,
1157 LCS_MAC_LENGTH) == 0) )
1158 break;
1159 }
1160 if (im4 == NULL)
1161 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1162 }
1163 spin_unlock_irqrestore(&card->ipm_lock, flags);
1164}
1165
1166static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
1167 struct ip_mc_list *im4,
1168 char *buf)
1169{
1170 struct lcs_ipm_list *tmp, *ipm = NULL;
1171 struct list_head *l;
1172 unsigned long flags;
1173
1174 LCS_DBF_TEXT(4, trace, "chkmcent");
1175 spin_lock_irqsave(&card->ipm_lock, flags);
1176 list_for_each(l, &card->ipm_list) {
1177 tmp = list_entry(l, struct lcs_ipm_list, list);
1178 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1179 (memcmp(buf, &tmp->ipm.mac_addr,
1180 LCS_MAC_LENGTH) == 0) ) {
1181 ipm = tmp;
1182 break;
1183 }
1184 }
1185 spin_unlock_irqrestore(&card->ipm_lock, flags);
1186 return ipm;
1187}
1188
1189static void lcs_set_mc_addresses(struct lcs_card *card,
1190 struct in_device *in4_dev)
1191{
1192
1193 struct ip_mc_list *im4;
1194 struct lcs_ipm_list *ipm;
1195 char buf[MAX_ADDR_LEN];
1196 unsigned long flags;
1197
1198 LCS_DBF_TEXT(4, trace, "setmclst");
1199 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1200 im4 = rcu_dereference(im4->next_rcu)) {
1201 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1202 ipm = lcs_check_addr_entry(card, im4, buf);
1203 if (ipm != NULL)
1204 continue; /* Address already in list. */
1205 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1206 if (ipm == NULL) {
1207 pr_info("Not enough memory to add"
1208 " new multicast entry!\n");
1209 break;
1210 }
1211 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1212 ipm->ipm.ip_addr = im4->multiaddr;
1213 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1214 spin_lock_irqsave(&card->ipm_lock, flags);
1215 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1216 list_add(&ipm->list, &card->ipm_list);
1217 spin_unlock_irqrestore(&card->ipm_lock, flags);
1218 }
1219}
1220
1221static int
1222lcs_register_mc_addresses(void *data)
1223{
1224 struct lcs_card *card;
1225 struct in_device *in4_dev;
1226
1227 card = (struct lcs_card *) data;
1228
1229 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1230 return 0;
1231 LCS_DBF_TEXT(4, trace, "regmulti");
1232
1233 in4_dev = in_dev_get(card->dev);
1234 if (in4_dev == NULL)
1235 goto out;
1236 rcu_read_lock();
1237 lcs_remove_mc_addresses(card,in4_dev);
1238 lcs_set_mc_addresses(card, in4_dev);
1239 rcu_read_unlock();
1240 in_dev_put(in4_dev);
1241
1242 netif_carrier_off(card->dev);
1243 netif_tx_disable(card->dev);
1244 wait_event(card->write.wait_q,
1245 (card->write.state != LCS_CH_STATE_RUNNING));
1246 lcs_fix_multicast_list(card);
1247 if (card->state == DEV_STATE_UP) {
1248 netif_carrier_on(card->dev);
1249 netif_wake_queue(card->dev);
1250 }
1251out:
1252 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1253 return 0;
1254}
1255#endif /* CONFIG_IP_MULTICAST */
1256
1257/*
1258 * function called by net device to
1259 * handle multicast address relevant things
1260 */
1261static void
1262lcs_set_multicast_list(struct net_device *dev)
1263{
1264#ifdef CONFIG_IP_MULTICAST
1265 struct lcs_card *card;
1266
1267 LCS_DBF_TEXT(4, trace, "setmulti");
1268 card = (struct lcs_card *) dev->ml_priv;
1269
1270 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1271 schedule_work(&card->kernel_thread_starter);
1272#endif /* CONFIG_IP_MULTICAST */
1273}
1274
1275static long
1276lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1277{
1278 if (!IS_ERR(irb))
1279 return 0;
1280
1281 switch (PTR_ERR(irb)) {
1282 case -EIO:
1283 dev_warn(&cdev->dev,
1284 "An I/O-error occurred on the LCS device\n");
1285 LCS_DBF_TEXT(2, trace, "ckirberr");
1286 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1287 break;
1288 case -ETIMEDOUT:
1289 dev_warn(&cdev->dev,
1290 "A command timed out on the LCS device\n");
1291 LCS_DBF_TEXT(2, trace, "ckirberr");
1292 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1293 break;
1294 default:
1295 dev_warn(&cdev->dev,
1296 "An error occurred on the LCS device, rc=%ld\n",
1297 PTR_ERR(irb));
1298 LCS_DBF_TEXT(2, trace, "ckirberr");
1299 LCS_DBF_TEXT(2, trace, " rc???");
1300 }
1301 return PTR_ERR(irb);
1302}
1303
1304static int
1305lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1306{
1307 int dstat, cstat;
1308 char *sense;
1309
1310 sense = (char *) irb->ecw;
1311 cstat = irb->scsw.cmd.cstat;
1312 dstat = irb->scsw.cmd.dstat;
1313
1314 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1315 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1316 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1317 LCS_DBF_TEXT(2, trace, "CGENCHK");
1318 return 1;
1319 }
1320 if (dstat & DEV_STAT_UNIT_CHECK) {
1321 if (sense[LCS_SENSE_BYTE_1] &
1322 LCS_SENSE_RESETTING_EVENT) {
1323 LCS_DBF_TEXT(2, trace, "REVIND");
1324 return 1;
1325 }
1326 if (sense[LCS_SENSE_BYTE_0] &
1327 LCS_SENSE_CMD_REJECT) {
1328 LCS_DBF_TEXT(2, trace, "CMDREJ");
1329 return 0;
1330 }
1331 if ((!sense[LCS_SENSE_BYTE_0]) &&
1332 (!sense[LCS_SENSE_BYTE_1]) &&
1333 (!sense[LCS_SENSE_BYTE_2]) &&
1334 (!sense[LCS_SENSE_BYTE_3])) {
1335 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1336 return 0;
1337 }
1338 LCS_DBF_TEXT(2, trace, "DGENCHK");
1339 return 1;
1340 }
1341 return 0;
1342}
1343
1344static void
1345lcs_schedule_recovery(struct lcs_card *card)
1346{
1347 LCS_DBF_TEXT(2, trace, "startrec");
1348 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1349 schedule_work(&card->kernel_thread_starter);
1350}
1351
1352/*
1353 * IRQ Handler for LCS channels
1354 */
1355static void
1356lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1357{
1358 struct lcs_card *card;
1359 struct lcs_channel *channel;
1360 int rc, index;
1361 int cstat, dstat;
1362
1363 if (lcs_check_irb_error(cdev, irb))
1364 return;
1365
1366 card = CARD_FROM_DEV(cdev);
1367 if (card->read.ccwdev == cdev)
1368 channel = &card->read;
1369 else
1370 channel = &card->write;
1371
1372 cstat = irb->scsw.cmd.cstat;
1373 dstat = irb->scsw.cmd.dstat;
1374 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1375 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1376 irb->scsw.cmd.dstat);
1377 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1378 irb->scsw.cmd.actl);
1379
1380 /* Check for channel and device errors presented */
1381 rc = lcs_get_problem(cdev, irb);
1382 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1383 dev_warn(&cdev->dev,
1384 "The LCS device stopped because of an error,"
1385 " dstat=0x%X, cstat=0x%X \n",
1386 dstat, cstat);
1387 if (rc) {
1388 channel->state = LCS_CH_STATE_ERROR;
1389 }
1390 }
1391 if (channel->state == LCS_CH_STATE_ERROR) {
1392 lcs_schedule_recovery(card);
1393 wake_up(&card->wait_q);
1394 return;
1395 }
1396 /* How far in the ccw chain have we processed? */
1397 if ((channel->state != LCS_CH_STATE_INIT) &&
1398 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1399 (irb->scsw.cmd.cpa != 0)) {
1400 index = (struct ccw1 *)dma32_to_virt(irb->scsw.cmd.cpa)
1401 - channel->ccws;
1402 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1403 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1404 /* Bloody io subsystem tells us lies about cpa... */
1405 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1406 while (channel->io_idx != index) {
1407 __lcs_processed_buffer(channel,
1408 channel->iob + channel->io_idx);
1409 channel->io_idx =
1410 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1411 }
1412 }
1413
1414 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1415 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1416 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1417 /* Mark channel as stopped. */
1418 channel->state = LCS_CH_STATE_STOPPED;
1419 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1420 /* CCW execution stopped on a suspend bit. */
1421 channel->state = LCS_CH_STATE_SUSPENDED;
1422 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1423 if (irb->scsw.cmd.cc != 0) {
1424 ccw_device_halt(channel->ccwdev, 0);
1425 return;
1426 }
1427 /* The channel has been stopped by halt_IO. */
1428 channel->state = LCS_CH_STATE_HALTED;
1429 }
1430 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1431 channel->state = LCS_CH_STATE_CLEARED;
1432 /* Do the rest in the tasklet. */
1433 tasklet_schedule(&channel->irq_tasklet);
1434}
1435
1436/*
1437 * Tasklet for IRQ handler
1438 */
1439static void
1440lcs_tasklet(unsigned long data)
1441{
1442 unsigned long flags;
1443 struct lcs_channel *channel;
1444 struct lcs_buffer *iob;
1445 int buf_idx;
1446
1447 channel = (struct lcs_channel *) data;
1448 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1449
1450 /* Check for processed buffers. */
1451 iob = channel->iob;
1452 buf_idx = channel->buf_idx;
1453 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1454 /* Do the callback thing. */
1455 if (iob[buf_idx].callback != NULL)
1456 iob[buf_idx].callback(channel, iob + buf_idx);
1457 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1458 }
1459 channel->buf_idx = buf_idx;
1460
1461 if (channel->state == LCS_CH_STATE_STOPPED)
1462 lcs_start_channel(channel);
1463 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1464 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1465 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1466 __lcs_resume_channel(channel);
1467 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1468
1469 /* Something happened on the channel. Wake up waiters. */
1470 wake_up(&channel->wait_q);
1471}
1472
1473/*
1474 * Finish current tx buffer and make it ready for transmit.
1475 */
1476static void
1477__lcs_emit_txbuffer(struct lcs_card *card)
1478{
1479 LCS_DBF_TEXT(5, trace, "emittx");
1480 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1481 card->tx_buffer->count += 2;
1482 lcs_ready_buffer(&card->write, card->tx_buffer);
1483 card->tx_buffer = NULL;
1484 card->tx_emitted++;
1485}
1486
1487/*
1488 * Callback for finished tx buffers.
1489 */
1490static void
1491lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1492{
1493 struct lcs_card *card;
1494
1495 LCS_DBF_TEXT(5, trace, "txbuffcb");
1496 /* Put buffer back to pool. */
1497 lcs_release_buffer(channel, buffer);
1498 card = container_of(channel, struct lcs_card, write);
1499 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1500 netif_wake_queue(card->dev);
1501 spin_lock(&card->lock);
1502 card->tx_emitted--;
1503 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1504 /*
1505 * Last running tx buffer has finished. Submit partially
1506 * filled current buffer.
1507 */
1508 __lcs_emit_txbuffer(card);
1509 spin_unlock(&card->lock);
1510}
1511
1512/*
1513 * Packet transmit function called by network stack
1514 */
1515static netdev_tx_t __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1516 struct net_device *dev)
1517{
1518 struct lcs_header *header;
1519 int rc = NETDEV_TX_OK;
1520
1521 LCS_DBF_TEXT(5, trace, "hardxmit");
1522 if (skb == NULL) {
1523 card->stats.tx_dropped++;
1524 card->stats.tx_errors++;
1525 return NETDEV_TX_OK;
1526 }
1527 if (card->state != DEV_STATE_UP) {
1528 dev_kfree_skb(skb);
1529 card->stats.tx_dropped++;
1530 card->stats.tx_errors++;
1531 card->stats.tx_carrier_errors++;
1532 return NETDEV_TX_OK;
1533 }
1534 if (skb->protocol == htons(ETH_P_IPV6)) {
1535 dev_kfree_skb(skb);
1536 return NETDEV_TX_OK;
1537 }
1538 netif_stop_queue(card->dev);
1539 spin_lock(&card->lock);
1540 if (card->tx_buffer != NULL &&
1541 card->tx_buffer->count + sizeof(struct lcs_header) +
1542 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1543 /* skb too big for current tx buffer. */
1544 __lcs_emit_txbuffer(card);
1545 if (card->tx_buffer == NULL) {
1546 /* Get new tx buffer */
1547 card->tx_buffer = lcs_get_buffer(&card->write);
1548 if (card->tx_buffer == NULL) {
1549 card->stats.tx_dropped++;
1550 rc = NETDEV_TX_BUSY;
1551 goto out;
1552 }
1553 card->tx_buffer->callback = lcs_txbuffer_cb;
1554 card->tx_buffer->count = 0;
1555 }
1556 header = (struct lcs_header *)
1557 (card->tx_buffer->data + card->tx_buffer->count);
1558 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1559 header->offset = card->tx_buffer->count;
1560 header->type = card->lan_type;
1561 header->slot = card->portno;
1562 skb_copy_from_linear_data(skb, header + 1, skb->len);
1563 spin_unlock(&card->lock);
1564 card->stats.tx_bytes += skb->len;
1565 card->stats.tx_packets++;
1566 dev_kfree_skb(skb);
1567 netif_wake_queue(card->dev);
1568 spin_lock(&card->lock);
1569 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1570 /* If this is the first tx buffer emit it immediately. */
1571 __lcs_emit_txbuffer(card);
1572out:
1573 spin_unlock(&card->lock);
1574 return rc;
1575}
1576
1577static netdev_tx_t lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1578{
1579 struct lcs_card *card;
1580 int rc;
1581
1582 LCS_DBF_TEXT(5, trace, "pktxmit");
1583 card = (struct lcs_card *) dev->ml_priv;
1584 rc = __lcs_start_xmit(card, skb, dev);
1585 return rc;
1586}
1587
1588/*
1589 * send startlan and lanstat command to make LCS device ready
1590 */
1591static int
1592lcs_startlan_auto(struct lcs_card *card)
1593{
1594 int rc;
1595
1596 LCS_DBF_TEXT(2, trace, "strtauto");
1597 card->lan_type = LCS_FRAME_TYPE_ENET;
1598 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1599 if (rc == 0)
1600 return 0;
1601
1602 return -EIO;
1603}
1604
1605static int
1606lcs_startlan(struct lcs_card *card)
1607{
1608 int rc, i;
1609
1610 LCS_DBF_TEXT(2, trace, "startlan");
1611 rc = 0;
1612 if (card->portno != LCS_INVALID_PORT_NO) {
1613 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1614 rc = lcs_startlan_auto(card);
1615 else
1616 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1617 } else {
1618 for (i = 0; i <= 16; i++) {
1619 card->portno = i;
1620 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1621 rc = lcs_send_startlan(card,
1622 LCS_INITIATOR_TCPIP);
1623 else
1624 /* autodetecting lan type */
1625 rc = lcs_startlan_auto(card);
1626 if (rc == 0)
1627 break;
1628 }
1629 }
1630 if (rc == 0)
1631 return lcs_send_lanstat(card);
1632 return rc;
1633}
1634
1635/*
1636 * LCS detect function
1637 * setup channels and make them I/O ready
1638 */
1639static int
1640lcs_detect(struct lcs_card *card)
1641{
1642 int rc = 0;
1643
1644 LCS_DBF_TEXT(2, setup, "lcsdetct");
1645 /* start/reset card */
1646 if (card->dev)
1647 netif_stop_queue(card->dev);
1648 rc = lcs_stop_channels(card);
1649 if (rc == 0) {
1650 rc = lcs_start_channels(card);
1651 if (rc == 0) {
1652 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1653 if (rc == 0)
1654 rc = lcs_startlan(card);
1655 }
1656 }
1657 if (rc == 0) {
1658 card->state = DEV_STATE_UP;
1659 } else {
1660 card->state = DEV_STATE_DOWN;
1661 card->write.state = LCS_CH_STATE_INIT;
1662 card->read.state = LCS_CH_STATE_INIT;
1663 }
1664 return rc;
1665}
1666
1667/*
1668 * LCS Stop card
1669 */
1670static int
1671lcs_stopcard(struct lcs_card *card)
1672{
1673 int rc;
1674
1675 LCS_DBF_TEXT(3, setup, "stopcard");
1676
1677 if (card->read.state != LCS_CH_STATE_STOPPED &&
1678 card->write.state != LCS_CH_STATE_STOPPED &&
1679 card->read.state != LCS_CH_STATE_ERROR &&
1680 card->write.state != LCS_CH_STATE_ERROR &&
1681 card->state == DEV_STATE_UP) {
1682 lcs_clear_multicast_list(card);
1683 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1684 rc = lcs_send_shutdown(card);
1685 }
1686 rc = lcs_stop_channels(card);
1687 card->state = DEV_STATE_DOWN;
1688
1689 return rc;
1690}
1691
1692/*
1693 * Kernel Thread helper functions for LGW initiated commands
1694 */
1695static void
1696lcs_start_kernel_thread(struct work_struct *work)
1697{
1698 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1699 LCS_DBF_TEXT(5, trace, "krnthrd");
1700 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1701 kthread_run(lcs_recovery, card, "lcs_recover");
1702#ifdef CONFIG_IP_MULTICAST
1703 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1704 kthread_run(lcs_register_mc_addresses, card, "regipm");
1705#endif
1706}
1707
1708/*
1709 * Process control frames.
1710 */
1711static void
1712lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1713{
1714 LCS_DBF_TEXT(5, trace, "getctrl");
1715 if (cmd->initiator == LCS_INITIATOR_LGW) {
1716 switch(cmd->cmd_code) {
1717 case LCS_CMD_STARTUP:
1718 case LCS_CMD_STARTLAN:
1719 lcs_schedule_recovery(card);
1720 break;
1721 case LCS_CMD_STOPLAN:
1722 if (card->dev) {
1723 pr_warn("Stoplan for %s initiated by LGW\n",
1724 card->dev->name);
1725 netif_carrier_off(card->dev);
1726 }
1727 break;
1728 default:
1729 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1730 break;
1731 }
1732 } else
1733 lcs_notify_lancmd_waiters(card, cmd);
1734}
1735
1736/*
1737 * Unpack network packet.
1738 */
1739static void
1740lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1741{
1742 struct sk_buff *skb;
1743
1744 LCS_DBF_TEXT(5, trace, "getskb");
1745 if (card->dev == NULL ||
1746 card->state != DEV_STATE_UP)
1747 /* The card isn't up. Ignore the packet. */
1748 return;
1749
1750 skb = dev_alloc_skb(skb_len);
1751 if (skb == NULL) {
1752 dev_err(&card->dev->dev,
1753 " Allocating a socket buffer to interface %s failed\n",
1754 card->dev->name);
1755 card->stats.rx_dropped++;
1756 return;
1757 }
1758 skb_put_data(skb, skb_data, skb_len);
1759 skb->protocol = card->lan_type_trans(skb, card->dev);
1760 card->stats.rx_bytes += skb_len;
1761 card->stats.rx_packets++;
1762 if (skb->protocol == htons(ETH_P_802_2))
1763 *((__u32 *)skb->cb) = ++card->pkt_seq;
1764 netif_rx(skb);
1765}
1766
1767/*
1768 * LCS main routine to get packets and lancmd replies from the buffers
1769 */
1770static void
1771lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1772{
1773 struct lcs_card *card;
1774 struct lcs_header *lcs_hdr;
1775 __u16 offset;
1776
1777 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1778 lcs_hdr = (struct lcs_header *) buffer->data;
1779 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1780 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1781 return;
1782 }
1783 card = container_of(channel, struct lcs_card, read);
1784 offset = 0;
1785 while (lcs_hdr->offset != 0) {
1786 if (lcs_hdr->offset <= 0 ||
1787 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1788 lcs_hdr->offset < offset) {
1789 /* Offset invalid. */
1790 card->stats.rx_length_errors++;
1791 card->stats.rx_errors++;
1792 return;
1793 }
1794 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1795 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1796 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET)
1797 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1798 lcs_hdr->offset - offset -
1799 sizeof(struct lcs_header));
1800 else
1801 dev_info_once(&card->dev->dev,
1802 "Unknown frame type %d\n",
1803 lcs_hdr->type);
1804 offset = lcs_hdr->offset;
1805 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1806 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1807 }
1808 /* The buffer is now empty. Make it ready again. */
1809 lcs_ready_buffer(&card->read, buffer);
1810}
1811
1812/*
1813 * get network statistics for ifconfig and other user programs
1814 */
1815static struct net_device_stats *
1816lcs_getstats(struct net_device *dev)
1817{
1818 struct lcs_card *card;
1819
1820 LCS_DBF_TEXT(4, trace, "netstats");
1821 card = (struct lcs_card *) dev->ml_priv;
1822 return &card->stats;
1823}
1824
1825/*
1826 * stop lcs device
1827 * This function will be called by user doing ifconfig xxx down
1828 */
1829static int
1830lcs_stop_device(struct net_device *dev)
1831{
1832 struct lcs_card *card;
1833 int rc;
1834
1835 LCS_DBF_TEXT(2, trace, "stopdev");
1836 card = (struct lcs_card *) dev->ml_priv;
1837 netif_carrier_off(dev);
1838 netif_tx_disable(dev);
1839 dev->flags &= ~IFF_UP;
1840 wait_event(card->write.wait_q,
1841 (card->write.state != LCS_CH_STATE_RUNNING));
1842 rc = lcs_stopcard(card);
1843 if (rc)
1844 dev_err(&card->dev->dev,
1845 " Shutting down the LCS device failed\n");
1846 return rc;
1847}
1848
1849/*
1850 * start lcs device and make it runnable
1851 * This function will be called by user doing ifconfig xxx up
1852 */
1853static int
1854lcs_open_device(struct net_device *dev)
1855{
1856 struct lcs_card *card;
1857 int rc;
1858
1859 LCS_DBF_TEXT(2, trace, "opendev");
1860 card = (struct lcs_card *) dev->ml_priv;
1861 /* initialize statistics */
1862 rc = lcs_detect(card);
1863 if (rc) {
1864 pr_err("Error in opening device!\n");
1865
1866 } else {
1867 dev->flags |= IFF_UP;
1868 netif_carrier_on(dev);
1869 netif_wake_queue(dev);
1870 card->state = DEV_STATE_UP;
1871 }
1872 return rc;
1873}
1874
1875/*
1876 * show function for portno called by cat or similar things
1877 */
1878static ssize_t
1879lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1880{
1881 struct lcs_card *card;
1882
1883 card = dev_get_drvdata(dev);
1884
1885 if (!card)
1886 return 0;
1887
1888 return sysfs_emit(buf, "%d\n", card->portno);
1889}
1890
1891/*
1892 * store the value which is piped to file portno
1893 */
1894static ssize_t
1895lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1896{
1897 struct lcs_card *card;
1898 int rc;
1899 s16 value;
1900
1901 card = dev_get_drvdata(dev);
1902
1903 if (!card)
1904 return 0;
1905
1906 rc = kstrtos16(buf, 0, &value);
1907 if (rc)
1908 return -EINVAL;
1909 /* TODO: sanity checks */
1910 card->portno = value;
1911 if (card->dev)
1912 card->dev->dev_port = card->portno;
1913
1914 return count;
1915
1916}
1917
1918static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1919
1920static const char *lcs_type[] = {
1921 "not a channel",
1922 "2216 parallel",
1923 "2216 channel",
1924 "OSA LCS card",
1925 "unknown channel type",
1926 "unsupported channel type",
1927};
1928
1929static ssize_t
1930lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1931{
1932 struct ccwgroup_device *cgdev;
1933
1934 cgdev = to_ccwgroupdev(dev);
1935 if (!cgdev)
1936 return -ENODEV;
1937
1938 return sysfs_emit(buf, "%s\n",
1939 lcs_type[cgdev->cdev[0]->id.driver_info]);
1940}
1941
1942static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1943
1944static ssize_t
1945lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1946{
1947 struct lcs_card *card;
1948
1949 card = dev_get_drvdata(dev);
1950
1951 return card ? sysfs_emit(buf, "%u\n", card->lancmd_timeout) : 0;
1952}
1953
1954static ssize_t
1955lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1956{
1957 struct lcs_card *card;
1958 unsigned int value;
1959 int rc;
1960
1961 card = dev_get_drvdata(dev);
1962
1963 if (!card)
1964 return 0;
1965
1966 rc = kstrtouint(buf, 0, &value);
1967 if (rc)
1968 return -EINVAL;
1969 /* TODO: sanity checks */
1970 card->lancmd_timeout = value;
1971
1972 return count;
1973
1974}
1975
1976static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1977
1978static ssize_t
1979lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1980 const char *buf, size_t count)
1981{
1982 struct lcs_card *card = dev_get_drvdata(dev);
1983 char *tmp;
1984 int i;
1985
1986 if (!card)
1987 return -EINVAL;
1988 if (card->state != DEV_STATE_UP)
1989 return -EPERM;
1990 i = simple_strtoul(buf, &tmp, 16);
1991 if (i == 1)
1992 lcs_schedule_recovery(card);
1993 return count;
1994}
1995
1996static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
1997
1998static struct attribute * lcs_attrs[] = {
1999 &dev_attr_portno.attr,
2000 &dev_attr_type.attr,
2001 &dev_attr_lancmd_timeout.attr,
2002 &dev_attr_recover.attr,
2003 NULL,
2004};
2005static struct attribute_group lcs_attr_group = {
2006 .attrs = lcs_attrs,
2007};
2008static const struct attribute_group *lcs_attr_groups[] = {
2009 &lcs_attr_group,
2010 NULL,
2011};
2012static const struct device_type lcs_devtype = {
2013 .name = "lcs",
2014 .groups = lcs_attr_groups,
2015};
2016
2017/*
2018 * lcs_probe_device is called on establishing a new ccwgroup_device.
2019 */
2020static int
2021lcs_probe_device(struct ccwgroup_device *ccwgdev)
2022{
2023 struct lcs_card *card;
2024
2025 if (!get_device(&ccwgdev->dev))
2026 return -ENODEV;
2027
2028 LCS_DBF_TEXT(2, setup, "add_dev");
2029 card = lcs_alloc_card();
2030 if (!card) {
2031 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2032 put_device(&ccwgdev->dev);
2033 return -ENOMEM;
2034 }
2035 dev_set_drvdata(&ccwgdev->dev, card);
2036 ccwgdev->cdev[0]->handler = lcs_irq;
2037 ccwgdev->cdev[1]->handler = lcs_irq;
2038 card->gdev = ccwgdev;
2039 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2040 card->thread_start_mask = 0;
2041 card->thread_allowed_mask = 0;
2042 card->thread_running_mask = 0;
2043 ccwgdev->dev.type = &lcs_devtype;
2044
2045 return 0;
2046}
2047
2048static int
2049lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2050{
2051 struct lcs_card *card;
2052
2053 LCS_DBF_TEXT(2, setup, "regnetdv");
2054 card = dev_get_drvdata(&ccwgdev->dev);
2055 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2056 return 0;
2057 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2058 return register_netdev(card->dev);
2059}
2060
2061/*
2062 * lcs_new_device will be called by setting the group device online.
2063 */
2064static const struct net_device_ops lcs_netdev_ops = {
2065 .ndo_open = lcs_open_device,
2066 .ndo_stop = lcs_stop_device,
2067 .ndo_get_stats = lcs_getstats,
2068 .ndo_start_xmit = lcs_start_xmit,
2069};
2070
2071static const struct net_device_ops lcs_mc_netdev_ops = {
2072 .ndo_open = lcs_open_device,
2073 .ndo_stop = lcs_stop_device,
2074 .ndo_get_stats = lcs_getstats,
2075 .ndo_start_xmit = lcs_start_xmit,
2076 .ndo_set_rx_mode = lcs_set_multicast_list,
2077};
2078
2079static int
2080lcs_new_device(struct ccwgroup_device *ccwgdev)
2081{
2082 struct lcs_card *card;
2083 struct net_device *dev=NULL;
2084 enum lcs_dev_states recover_state;
2085 int rc;
2086
2087 card = dev_get_drvdata(&ccwgdev->dev);
2088 if (!card)
2089 return -ENODEV;
2090
2091 LCS_DBF_TEXT(2, setup, "newdev");
2092 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2093 card->read.ccwdev = ccwgdev->cdev[0];
2094 card->write.ccwdev = ccwgdev->cdev[1];
2095
2096 recover_state = card->state;
2097 rc = ccw_device_set_online(card->read.ccwdev);
2098 if (rc)
2099 goto out_err;
2100 rc = ccw_device_set_online(card->write.ccwdev);
2101 if (rc)
2102 goto out_werr;
2103
2104 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2105
2106 lcs_setup_card(card);
2107 rc = lcs_detect(card);
2108 if (rc) {
2109 LCS_DBF_TEXT(2, setup, "dtctfail");
2110 dev_err(&ccwgdev->dev,
2111 "Detecting a network adapter for LCS devices"
2112 " failed with rc=%d (0x%x)\n", rc, rc);
2113 lcs_stopcard(card);
2114 goto out;
2115 }
2116 if (card->dev) {
2117 LCS_DBF_TEXT(2, setup, "samedev");
2118 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2119 goto netdev_out;
2120 }
2121 switch (card->lan_type) {
2122 case LCS_FRAME_TYPE_ENET:
2123 card->lan_type_trans = eth_type_trans;
2124 dev = alloc_etherdev(0);
2125 break;
2126 default:
2127 LCS_DBF_TEXT(3, setup, "errinit");
2128 pr_err(" Initialization failed\n");
2129 goto out;
2130 }
2131 if (!dev)
2132 goto out;
2133 card->dev = dev;
2134 card->dev->ml_priv = card;
2135 card->dev->netdev_ops = &lcs_netdev_ops;
2136 card->dev->dev_port = card->portno;
2137 eth_hw_addr_set(card->dev, card->mac);
2138#ifdef CONFIG_IP_MULTICAST
2139 if (!lcs_check_multicast_support(card))
2140 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2141#endif
2142netdev_out:
2143 lcs_set_allowed_threads(card,0xffffffff);
2144 if (recover_state == DEV_STATE_RECOVER) {
2145 lcs_set_multicast_list(card->dev);
2146 card->dev->flags |= IFF_UP;
2147 netif_carrier_on(card->dev);
2148 netif_wake_queue(card->dev);
2149 card->state = DEV_STATE_UP;
2150 } else {
2151 lcs_stopcard(card);
2152 }
2153
2154 if (lcs_register_netdev(ccwgdev) != 0)
2155 goto out;
2156
2157 /* Print out supported assists: IPv6 */
2158 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2159 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2160 "with" : "without");
2161 /* Print out supported assist: Multicast */
2162 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2163 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2164 "with" : "without");
2165 return 0;
2166out:
2167
2168 ccw_device_set_offline(card->write.ccwdev);
2169out_werr:
2170 ccw_device_set_offline(card->read.ccwdev);
2171out_err:
2172 return -ENODEV;
2173}
2174
2175/*
2176 * lcs_shutdown_device, called when setting the group device offline.
2177 */
2178static int
2179__lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2180{
2181 struct lcs_card *card;
2182 enum lcs_dev_states recover_state;
2183 int ret = 0, ret2 = 0, ret3 = 0;
2184
2185 LCS_DBF_TEXT(3, setup, "shtdndev");
2186 card = dev_get_drvdata(&ccwgdev->dev);
2187 if (!card)
2188 return -ENODEV;
2189 if (recovery_mode == 0) {
2190 lcs_set_allowed_threads(card, 0);
2191 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2192 return -ERESTARTSYS;
2193 }
2194 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2195 recover_state = card->state;
2196
2197 ret = lcs_stop_device(card->dev);
2198 ret2 = ccw_device_set_offline(card->read.ccwdev);
2199 ret3 = ccw_device_set_offline(card->write.ccwdev);
2200 if (!ret)
2201 ret = (ret2) ? ret2 : ret3;
2202 if (ret)
2203 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2204 if (recover_state == DEV_STATE_UP) {
2205 card->state = DEV_STATE_RECOVER;
2206 }
2207 return 0;
2208}
2209
2210static int
2211lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2212{
2213 return __lcs_shutdown_device(ccwgdev, 0);
2214}
2215
2216/*
2217 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2218 */
2219static int
2220lcs_recovery(void *ptr)
2221{
2222 struct lcs_card *card;
2223 struct ccwgroup_device *gdev;
2224 int rc;
2225
2226 card = (struct lcs_card *) ptr;
2227
2228 LCS_DBF_TEXT(4, trace, "recover1");
2229 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2230 return 0;
2231 LCS_DBF_TEXT(4, trace, "recover2");
2232 gdev = card->gdev;
2233 dev_warn(&gdev->dev,
2234 "A recovery process has been started for the LCS device\n");
2235 rc = __lcs_shutdown_device(gdev, 1);
2236 rc = lcs_new_device(gdev);
2237 if (!rc)
2238 pr_info("Device %s successfully recovered!\n",
2239 card->dev->name);
2240 else
2241 pr_info("Device %s could not be recovered!\n",
2242 card->dev->name);
2243 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2244 return 0;
2245}
2246
2247/*
2248 * lcs_remove_device, free buffers and card
2249 */
2250static void
2251lcs_remove_device(struct ccwgroup_device *ccwgdev)
2252{
2253 struct lcs_card *card;
2254
2255 card = dev_get_drvdata(&ccwgdev->dev);
2256 if (!card)
2257 return;
2258
2259 LCS_DBF_TEXT(3, setup, "remdev");
2260 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2261 if (ccwgdev->state == CCWGROUP_ONLINE) {
2262 lcs_shutdown_device(ccwgdev);
2263 }
2264 if (card->dev)
2265 unregister_netdev(card->dev);
2266 lcs_cleanup_card(card);
2267 lcs_free_card(card);
2268 dev_set_drvdata(&ccwgdev->dev, NULL);
2269 put_device(&ccwgdev->dev);
2270}
2271
2272static struct ccw_device_id lcs_ids[] = {
2273 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2274 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2275 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2276 {},
2277};
2278MODULE_DEVICE_TABLE(ccw, lcs_ids);
2279
2280static struct ccw_driver lcs_ccw_driver = {
2281 .driver = {
2282 .owner = THIS_MODULE,
2283 .name = "lcs",
2284 },
2285 .ids = lcs_ids,
2286 .probe = ccwgroup_probe_ccwdev,
2287 .remove = ccwgroup_remove_ccwdev,
2288 .int_class = IRQIO_LCS,
2289};
2290
2291/*
2292 * LCS ccwgroup driver registration
2293 */
2294static struct ccwgroup_driver lcs_group_driver = {
2295 .driver = {
2296 .owner = THIS_MODULE,
2297 .name = "lcs",
2298 },
2299 .ccw_driver = &lcs_ccw_driver,
2300 .setup = lcs_probe_device,
2301 .remove = lcs_remove_device,
2302 .set_online = lcs_new_device,
2303 .set_offline = lcs_shutdown_device,
2304};
2305
2306static ssize_t group_store(struct device_driver *ddrv, const char *buf,
2307 size_t count)
2308{
2309 int err;
2310 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2311 return err ? err : count;
2312}
2313static DRIVER_ATTR_WO(group);
2314
2315static struct attribute *lcs_drv_attrs[] = {
2316 &driver_attr_group.attr,
2317 NULL,
2318};
2319static struct attribute_group lcs_drv_attr_group = {
2320 .attrs = lcs_drv_attrs,
2321};
2322static const struct attribute_group *lcs_drv_attr_groups[] = {
2323 &lcs_drv_attr_group,
2324 NULL,
2325};
2326
2327/*
2328 * LCS Module/Kernel initialization function
2329 */
2330static int
2331__init lcs_init_module(void)
2332{
2333 int rc;
2334
2335 pr_info("Loading %s\n", version);
2336 rc = lcs_register_debug_facility();
2337 LCS_DBF_TEXT(0, setup, "lcsinit");
2338 if (rc)
2339 goto out_err;
2340 lcs_root_dev = root_device_register("lcs");
2341 rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2342 if (rc)
2343 goto register_err;
2344 rc = ccw_driver_register(&lcs_ccw_driver);
2345 if (rc)
2346 goto ccw_err;
2347 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2348 rc = ccwgroup_driver_register(&lcs_group_driver);
2349 if (rc)
2350 goto ccwgroup_err;
2351 return 0;
2352
2353ccwgroup_err:
2354 ccw_driver_unregister(&lcs_ccw_driver);
2355ccw_err:
2356 root_device_unregister(lcs_root_dev);
2357register_err:
2358 lcs_unregister_debug_facility();
2359out_err:
2360 pr_err("Initializing the lcs device driver failed\n");
2361 return rc;
2362}
2363
2364
2365/*
2366 * LCS module cleanup function
2367 */
2368static void
2369__exit lcs_cleanup_module(void)
2370{
2371 pr_info("Terminating lcs module.\n");
2372 LCS_DBF_TEXT(0, trace, "cleanup");
2373 ccwgroup_driver_unregister(&lcs_group_driver);
2374 ccw_driver_unregister(&lcs_ccw_driver);
2375 root_device_unregister(lcs_root_dev);
2376 lcs_unregister_debug_facility();
2377}
2378
2379module_init(lcs_init_module);
2380module_exit(lcs_cleanup_module);
2381
2382MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2383MODULE_DESCRIPTION("S/390 LAN channel station device driver");
2384MODULE_LICENSE("GPL");
2385