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

source code of linux/drivers/s390/net/lcs.c