?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
Merge tag 'trace-printf-v6.13' of git://git.kernel.org/pub/scm/linux/kernel/git/trace...
[drm/drm-misc.git] / drivers / s390 / net / lcs.c
blob88db8378325a34393c7635160727a8edaa42ceef
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
42 static char version[] __initdata = "LCS driver";
43
44 /*
45 * the root device for lcs group devices
46 */
47 static struct device *lcs_root_dev;
48
49 /*
50 * Some prototypes.
51 */
52 static void lcs_tasklet(unsigned long);
53 static void lcs_start_kernel_thread(struct work_struct *);
54 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
55 #ifdef CONFIG_IP_MULTICAST
56 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
57 #endif /* CONFIG_IP_MULTICAST */
58 static int lcs_recovery(void *ptr);
59
60 /*
61 * Debug Facility Stuff
62 */
63 static char debug_buffer[255];
64 static debug_info_t *lcs_dbf_setup;
65 static debug_info_t *lcs_dbf_trace;
66
67 /*
68 * LCS Debug Facility functions
69 */
70 static void
71 lcs_unregister_debug_facility(void)
72 {
73 debug_unregister(lcs_dbf_setup);
74 debug_unregister(lcs_dbf_trace);
75 }
76
77 static int
78 lcs_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 */
97 static int
98 lcs_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 */
124 static void
125 lcs_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 */
139 static void
140 lcs_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 */
152 static void
153 lcs_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 */
163 static struct lcs_card *
164 lcs_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 */
203 static void
204 lcs_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
241 static void
242 lcs_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 */
257 static void
258 lcs_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
287 static void
288 lcs_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
300 static void
301 lcs_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 }
310 static 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
321 static int
322 lcs_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
328 static 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
343 static void
344 lcs_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
354 static 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
373 static int
374 lcs_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
382 static int
383 lcs_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 */
401 static void
402 lcs_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
424 static 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 */
451 static void
452 lcs_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 */
468 static int
469 lcs_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
492 static int
493 lcs_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 */
517 static int
518 lcs_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 */
545 static int
546 lcs_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 */
565 static int
566 lcs_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 */
577 static 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
594 static struct lcs_buffer *
595 lcs_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 */
610 static 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 */
636 static 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
654 static int
655 lcs_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 */
680 static 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 */
712 static void
713 lcs_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 */
728 static struct lcs_buffer *
729 lcs_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
750 static void
751 lcs_get_reply(struct lcs_reply *reply)
752 {
753 refcount_inc(&reply->refcnt);
754 }
755
756 static void
757 lcs_put_reply(struct lcs_reply *reply)
758 {
759 if (refcount_dec_and_test(&reply->refcnt))
760 kfree(reply);
761 }
762
763 static struct lcs_reply *
764 lcs_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 */
785 static void
786 lcs_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 */
813 static void
814 lcs_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
838 static int
839 lcs_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 */
877 static int
878 lcs_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 */
895 static int
896 lcs_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 */
912 static 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
919 static int
920 lcs_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 */
939 static int
940 lcs_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 */
958 static 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
966 static int
967 lcs_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 */
986 static int
987 lcs_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 */
1010 static int
1011 lcs_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 */
1034 static 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
1044 static int
1045 lcs_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 */
1074 static void
1075 lcs_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);
1085 list_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 */
1129 static void
1130 lcs_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 */
1139 static 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
1166 static 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
1189 static 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
1221 static int
1222 lcs_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 }
1251 out:
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 */
1261 static void
1262 lcs_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
1275 static long
1276 lcs_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
1304 static int
1305 lcs_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
1344 static void
1345 lcs_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 */
1355 static void
1356 lcs_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 */
1439 static void
1440 lcs_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 */
1476 static 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 */
1490 static void
1491 lcs_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 */
1515 static 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);
1572 out:
1573 spin_unlock(&card->lock);
1574 return rc;
1575 }
1576
1577 static 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 */
1591 static int
1592 lcs_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
1605 static int
1606 lcs_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 */
1639 static int
1640 lcs_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 */
1670 static int
1671 lcs_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 */
1695 static void
1696 lcs_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 */
1711 static void
1712 lcs_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 */
1739 static void
1740 lcs_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 */
1770 static void
1771 lcs_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 */
1815 static struct net_device_stats *
1816 lcs_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 */
1829 static int
1830 lcs_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 */
1853 static int
1854 lcs_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 */
1878 static ssize_t
1879 lcs_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 */
1894 static ssize_t
1895 lcs_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
1918 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1919
1920 static 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
1929 static ssize_t
1930 lcs_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
1942 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1943
1944 static ssize_t
1945 lcs_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
1954 static ssize_t
1955 lcs_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
1976 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1977
1978 static ssize_t
1979 lcs_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
1996 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
1997
1998 static 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 };
2005 static struct attribute_group lcs_attr_group = {
2006 .attrs = lcs_attrs,
2007 };
2008 static const struct attribute_group *lcs_attr_groups[] = {
2009 &lcs_attr_group,
2010 NULL,
2011 };
2012 static 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 */
2020 static int
2021 lcs_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
2048 static int
2049 lcs_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 */
2064 static 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
2071 static 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
2079 static int
2080 lcs_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
2142 netdev_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;
2166 out:
2167
2168 ccw_device_set_offline(card->write.ccwdev);
2169 out_werr:
2170 ccw_device_set_offline(card->read.ccwdev);
2171 out_err:
2172 return -ENODEV;
2173 }
2174
2175 /*
2176 * lcs_shutdown_device, called when setting the group device offline.
2177 */
2178 static 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
2210 static int
2211 lcs_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 */
2219 static int
2220 lcs_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 */
2250 static void
2251 lcs_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
2272 static 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 };
2278 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2279
2280 static 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 */
2294 static 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
2306 static 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 }
2313 static DRIVER_ATTR_WO(group);
2314
2315 static struct attribute *lcs_drv_attrs[] = {
2316 &driver_attr_group.attr,
2317 NULL,
2318 };
2319 static struct attribute_group lcs_drv_attr_group = {
2320 .attrs = lcs_drv_attrs,
2321 };
2322 static 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 */
2330 static 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
2353 ccwgroup_err:
2354 ccw_driver_unregister(&lcs_ccw_driver);
2355 ccw_err:
2356 root_device_unregister(lcs_root_dev);
2357 register_err:
2358 lcs_unregister_debug_facility();
2359 out_err:
2360 pr_err("Initializing the lcs device driver failed\n");
2361 return rc;
2362 }
2363
2364
2365 /*
2366 * LCS module cleanup function
2367 */
2368 static 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
2379 module_init(lcs_init_module);
2380 module_exit(lcs_cleanup_module);
2381
2382 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2383 MODULE_DESCRIPTION("S/390 LAN channel station device driver");
2384 MODULE_LICENSE("GPL");
2385
Kernel DRM miscellaneous fixes and cross-tree changes