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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / s390 / net / lcs.c
blob8f08b0a2917c61a8c5d192f04866114735688c01
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Linux for S/390 Lan Channel Station Network Driver
4 *
5 * Copyright IBM Corp. 1999, 2009
6 * Author(s): Original Code written by
7 * DJ Barrow <djbarrow@de.ibm.com,barrow_dj@yahoo.com>
8 * Rewritten by
9 * Frank Pavlic <fpavlic@de.ibm.com> and
10 * Martin Schwidefsky <schwidefsky@de.ibm.com>
11 */
12
13 #define KMSG_COMPONENT "lcs"
14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16 #include <linux/module.h>
17 #include <linux/if.h>
18 #include <linux/netdevice.h>
19 #include <linux/etherdevice.h>
20 #include <linux/fddidevice.h>
21 #include <linux/inetdevice.h>
22 #include <linux/in.h>
23 #include <linux/igmp.h>
24 #include <linux/delay.h>
25 #include <linux/kthread.h>
26 #include <linux/slab.h>
27 #include <net/arp.h>
28 #include <net/ip.h>
29
30 #include <asm/debug.h>
31 #include <asm/idals.h>
32 #include <asm/timex.h>
33 #include <linux/device.h>
34 #include <asm/ccwgroup.h>
35
36 #include "lcs.h"
37
38
39 #if !defined(CONFIG_ETHERNET) && !defined(CONFIG_FDDI)
40 #error Cannot compile lcs.c without some net devices switched on.
41 #endif
42
43 /**
44 * initialization string for output
45 */
46
47 static char version[] __initdata = "LCS driver";
48
49 /**
50 * the root device for lcs group devices
51 */
52 static struct device *lcs_root_dev;
53
54 /**
55 * Some prototypes.
56 */
57 static void lcs_tasklet(unsigned long);
58 static void lcs_start_kernel_thread(struct work_struct *);
59 static void lcs_get_frames_cb(struct lcs_channel *, struct lcs_buffer *);
60 #ifdef CONFIG_IP_MULTICAST
61 static int lcs_send_delipm(struct lcs_card *, struct lcs_ipm_list *);
62 #endif /* CONFIG_IP_MULTICAST */
63 static int lcs_recovery(void *ptr);
64
65 /**
66 * Debug Facility Stuff
67 */
68 static char debug_buffer[255];
69 static debug_info_t *lcs_dbf_setup;
70 static debug_info_t *lcs_dbf_trace;
71
72 /**
73 * LCS Debug Facility functions
74 */
75 static void
76 lcs_unregister_debug_facility(void)
77 {
78 debug_unregister(lcs_dbf_setup);
79 debug_unregister(lcs_dbf_trace);
80 }
81
82 static int
83 lcs_register_debug_facility(void)
84 {
85 lcs_dbf_setup = debug_register("lcs_setup", 2, 1, 8);
86 lcs_dbf_trace = debug_register("lcs_trace", 4, 1, 8);
87 if (lcs_dbf_setup == NULL || lcs_dbf_trace == NULL) {
88 pr_err("Not enough memory for debug facility.\n");
89 lcs_unregister_debug_facility();
90 return -ENOMEM;
91 }
92 debug_register_view(lcs_dbf_setup, &debug_hex_ascii_view);
93 debug_set_level(lcs_dbf_setup, 2);
94 debug_register_view(lcs_dbf_trace, &debug_hex_ascii_view);
95 debug_set_level(lcs_dbf_trace, 2);
96 return 0;
97 }
98
99 /**
100 * Allocate io buffers.
101 */
102 static int
103 lcs_alloc_channel(struct lcs_channel *channel)
104 {
105 int cnt;
106
107 LCS_DBF_TEXT(2, setup, "ichalloc");
108 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
109 /* alloc memory fo iobuffer */
110 channel->iob[cnt].data =
111 kzalloc(LCS_IOBUFFERSIZE, GFP_DMA | GFP_KERNEL);
112 if (channel->iob[cnt].data == NULL)
113 break;
114 channel->iob[cnt].state = LCS_BUF_STATE_EMPTY;
115 }
116 if (cnt < LCS_NUM_BUFFS) {
117 /* Not all io buffers could be allocated. */
118 LCS_DBF_TEXT(2, setup, "echalloc");
119 while (cnt-- > 0)
120 kfree(channel->iob[cnt].data);
121 return -ENOMEM;
122 }
123 return 0;
124 }
125
126 /**
127 * Free io buffers.
128 */
129 static void
130 lcs_free_channel(struct lcs_channel *channel)
131 {
132 int cnt;
133
134 LCS_DBF_TEXT(2, setup, "ichfree");
135 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
136 kfree(channel->iob[cnt].data);
137 channel->iob[cnt].data = NULL;
138 }
139 }
140
141 /*
142 * Cleanup channel.
143 */
144 static void
145 lcs_cleanup_channel(struct lcs_channel *channel)
146 {
147 LCS_DBF_TEXT(3, setup, "cleanch");
148 /* Kill write channel tasklets. */
149 tasklet_kill(&channel->irq_tasklet);
150 /* Free channel buffers. */
151 lcs_free_channel(channel);
152 }
153
154 /**
155 * LCS free memory for card and channels.
156 */
157 static void
158 lcs_free_card(struct lcs_card *card)
159 {
160 LCS_DBF_TEXT(2, setup, "remcard");
161 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
162 kfree(card);
163 }
164
165 /**
166 * LCS alloc memory for card and channels
167 */
168 static struct lcs_card *
169 lcs_alloc_card(void)
170 {
171 struct lcs_card *card;
172 int rc;
173
174 LCS_DBF_TEXT(2, setup, "alloclcs");
175
176 card = kzalloc(sizeof(struct lcs_card), GFP_KERNEL | GFP_DMA);
177 if (card == NULL)
178 return NULL;
179 card->lan_type = LCS_FRAME_TYPE_AUTO;
180 card->pkt_seq = 0;
181 card->lancmd_timeout = LCS_LANCMD_TIMEOUT_DEFAULT;
182 /* Allocate io buffers for the read channel. */
183 rc = lcs_alloc_channel(&card->read);
184 if (rc){
185 LCS_DBF_TEXT(2, setup, "iccwerr");
186 lcs_free_card(card);
187 return NULL;
188 }
189 /* Allocate io buffers for the write channel. */
190 rc = lcs_alloc_channel(&card->write);
191 if (rc) {
192 LCS_DBF_TEXT(2, setup, "iccwerr");
193 lcs_cleanup_channel(&card->read);
194 lcs_free_card(card);
195 return NULL;
196 }
197
198 #ifdef CONFIG_IP_MULTICAST
199 INIT_LIST_HEAD(&card->ipm_list);
200 #endif
201 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
202 return card;
203 }
204
205 /*
206 * Setup read channel.
207 */
208 static void
209 lcs_setup_read_ccws(struct lcs_card *card)
210 {
211 int cnt;
212
213 LCS_DBF_TEXT(2, setup, "ireadccw");
214 /* Setup read ccws. */
215 memset(card->read.ccws, 0, sizeof (struct ccw1) * (LCS_NUM_BUFFS + 1));
216 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
217 card->read.ccws[cnt].cmd_code = LCS_CCW_READ;
218 card->read.ccws[cnt].count = LCS_IOBUFFERSIZE;
219 card->read.ccws[cnt].flags =
220 CCW_FLAG_CC | CCW_FLAG_SLI | CCW_FLAG_PCI;
221 /*
222 * Note: we have allocated the buffer with GFP_DMA, so
223 * we do not need to do set_normalized_cda.
224 */
225 card->read.ccws[cnt].cda =
226 (__u32) __pa(card->read.iob[cnt].data);
227 ((struct lcs_header *)
228 card->read.iob[cnt].data)->offset = LCS_ILLEGAL_OFFSET;
229 card->read.iob[cnt].callback = lcs_get_frames_cb;
230 card->read.iob[cnt].state = LCS_BUF_STATE_READY;
231 card->read.iob[cnt].count = LCS_IOBUFFERSIZE;
232 }
233 card->read.ccws[0].flags &= ~CCW_FLAG_PCI;
234 card->read.ccws[LCS_NUM_BUFFS - 1].flags &= ~CCW_FLAG_PCI;
235 card->read.ccws[LCS_NUM_BUFFS - 1].flags |= CCW_FLAG_SUSPEND;
236 /* Last ccw is a tic (transfer in channel). */
237 card->read.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
238 card->read.ccws[LCS_NUM_BUFFS].cda =
239 (__u32) __pa(card->read.ccws);
240 /* Setg initial state of the read channel. */
241 card->read.state = LCS_CH_STATE_INIT;
242
243 card->read.io_idx = 0;
244 card->read.buf_idx = 0;
245 }
246
247 static void
248 lcs_setup_read(struct lcs_card *card)
249 {
250 LCS_DBF_TEXT(3, setup, "initread");
251
252 lcs_setup_read_ccws(card);
253 /* Initialize read channel tasklet. */
254 card->read.irq_tasklet.data = (unsigned long) &card->read;
255 card->read.irq_tasklet.func = lcs_tasklet;
256 /* Initialize waitqueue. */
257 init_waitqueue_head(&card->read.wait_q);
258 }
259
260 /*
261 * Setup write channel.
262 */
263 static void
264 lcs_setup_write_ccws(struct lcs_card *card)
265 {
266 int cnt;
267
268 LCS_DBF_TEXT(3, setup, "iwritccw");
269 /* Setup write ccws. */
270 memset(card->write.ccws, 0, sizeof(struct ccw1) * (LCS_NUM_BUFFS + 1));
271 for (cnt = 0; cnt < LCS_NUM_BUFFS; cnt++) {
272 card->write.ccws[cnt].cmd_code = LCS_CCW_WRITE;
273 card->write.ccws[cnt].count = 0;
274 card->write.ccws[cnt].flags =
275 CCW_FLAG_SUSPEND | CCW_FLAG_CC | CCW_FLAG_SLI;
276 /*
277 * Note: we have allocated the buffer with GFP_DMA, so
278 * we do not need to do set_normalized_cda.
279 */
280 card->write.ccws[cnt].cda =
281 (__u32) __pa(card->write.iob[cnt].data);
282 }
283 /* Last ccw is a tic (transfer in channel). */
284 card->write.ccws[LCS_NUM_BUFFS].cmd_code = LCS_CCW_TRANSFER;
285 card->write.ccws[LCS_NUM_BUFFS].cda =
286 (__u32) __pa(card->write.ccws);
287 /* Set initial state of the write channel. */
288 card->read.state = LCS_CH_STATE_INIT;
289
290 card->write.io_idx = 0;
291 card->write.buf_idx = 0;
292 }
293
294 static void
295 lcs_setup_write(struct lcs_card *card)
296 {
297 LCS_DBF_TEXT(3, setup, "initwrit");
298
299 lcs_setup_write_ccws(card);
300 /* Initialize write channel tasklet. */
301 card->write.irq_tasklet.data = (unsigned long) &card->write;
302 card->write.irq_tasklet.func = lcs_tasklet;
303 /* Initialize waitqueue. */
304 init_waitqueue_head(&card->write.wait_q);
305 }
306
307 static void
308 lcs_set_allowed_threads(struct lcs_card *card, unsigned long threads)
309 {
310 unsigned long flags;
311
312 spin_lock_irqsave(&card->mask_lock, flags);
313 card->thread_allowed_mask = threads;
314 spin_unlock_irqrestore(&card->mask_lock, flags);
315 wake_up(&card->wait_q);
316 }
317 static int lcs_threads_running(struct lcs_card *card, unsigned long threads)
318 {
319 unsigned long flags;
320 int rc = 0;
321
322 spin_lock_irqsave(&card->mask_lock, flags);
323 rc = (card->thread_running_mask & threads);
324 spin_unlock_irqrestore(&card->mask_lock, flags);
325 return rc;
326 }
327
328 static int
329 lcs_wait_for_threads(struct lcs_card *card, unsigned long threads)
330 {
331 return wait_event_interruptible(card->wait_q,
332 lcs_threads_running(card, threads) == 0);
333 }
334
335 static int lcs_set_thread_start_bit(struct lcs_card *card, unsigned long thread)
336 {
337 unsigned long flags;
338
339 spin_lock_irqsave(&card->mask_lock, flags);
340 if ( !(card->thread_allowed_mask & thread) ||
341 (card->thread_start_mask & thread) ) {
342 spin_unlock_irqrestore(&card->mask_lock, flags);
343 return -EPERM;
344 }
345 card->thread_start_mask |= thread;
346 spin_unlock_irqrestore(&card->mask_lock, flags);
347 return 0;
348 }
349
350 static void
351 lcs_clear_thread_running_bit(struct lcs_card *card, unsigned long thread)
352 {
353 unsigned long flags;
354
355 spin_lock_irqsave(&card->mask_lock, flags);
356 card->thread_running_mask &= ~thread;
357 spin_unlock_irqrestore(&card->mask_lock, flags);
358 wake_up(&card->wait_q);
359 }
360
361 static int __lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
362 {
363 unsigned long flags;
364 int rc = 0;
365
366 spin_lock_irqsave(&card->mask_lock, flags);
367 if (card->thread_start_mask & thread){
368 if ((card->thread_allowed_mask & thread) &&
369 !(card->thread_running_mask & thread)){
370 rc = 1;
371 card->thread_start_mask &= ~thread;
372 card->thread_running_mask |= thread;
373 } else
374 rc = -EPERM;
375 }
376 spin_unlock_irqrestore(&card->mask_lock, flags);
377 return rc;
378 }
379
380 static int
381 lcs_do_run_thread(struct lcs_card *card, unsigned long thread)
382 {
383 int rc = 0;
384 wait_event(card->wait_q,
385 (rc = __lcs_do_run_thread(card, thread)) >= 0);
386 return rc;
387 }
388
389 static int
390 lcs_do_start_thread(struct lcs_card *card, unsigned long thread)
391 {
392 unsigned long flags;
393 int rc = 0;
394
395 spin_lock_irqsave(&card->mask_lock, flags);
396 LCS_DBF_TEXT_(4, trace, " %02x%02x%02x",
397 (u8) card->thread_start_mask,
398 (u8) card->thread_allowed_mask,
399 (u8) card->thread_running_mask);
400 rc = (card->thread_start_mask & thread);
401 spin_unlock_irqrestore(&card->mask_lock, flags);
402 return rc;
403 }
404
405 /**
406 * Initialize channels,card and state machines.
407 */
408 static void
409 lcs_setup_card(struct lcs_card *card)
410 {
411 LCS_DBF_TEXT(2, setup, "initcard");
412 LCS_DBF_HEX(2, setup, &card, sizeof(void*));
413
414 lcs_setup_read(card);
415 lcs_setup_write(card);
416 /* Set cards initial state. */
417 card->state = DEV_STATE_DOWN;
418 card->tx_buffer = NULL;
419 card->tx_emitted = 0;
420
421 init_waitqueue_head(&card->wait_q);
422 spin_lock_init(&card->lock);
423 spin_lock_init(&card->ipm_lock);
424 spin_lock_init(&card->mask_lock);
425 #ifdef CONFIG_IP_MULTICAST
426 INIT_LIST_HEAD(&card->ipm_list);
427 #endif
428 INIT_LIST_HEAD(&card->lancmd_waiters);
429 }
430
431 static void lcs_clear_multicast_list(struct lcs_card *card)
432 {
433 #ifdef CONFIG_IP_MULTICAST
434 struct lcs_ipm_list *ipm;
435 unsigned long flags;
436
437 /* Free multicast list. */
438 LCS_DBF_TEXT(3, setup, "clmclist");
439 spin_lock_irqsave(&card->ipm_lock, flags);
440 while (!list_empty(&card->ipm_list)){
441 ipm = list_entry(card->ipm_list.next,
442 struct lcs_ipm_list, list);
443 list_del(&ipm->list);
444 if (ipm->ipm_state != LCS_IPM_STATE_SET_REQUIRED){
445 spin_unlock_irqrestore(&card->ipm_lock, flags);
446 lcs_send_delipm(card, ipm);
447 spin_lock_irqsave(&card->ipm_lock, flags);
448 }
449 kfree(ipm);
450 }
451 spin_unlock_irqrestore(&card->ipm_lock, flags);
452 #endif
453 }
454 /**
455 * Cleanup channels,card and state machines.
456 */
457 static void
458 lcs_cleanup_card(struct lcs_card *card)
459 {
460
461 LCS_DBF_TEXT(3, setup, "cleancrd");
462 LCS_DBF_HEX(2,setup,&card,sizeof(void*));
463
464 if (card->dev != NULL)
465 free_netdev(card->dev);
466 /* Cleanup channels. */
467 lcs_cleanup_channel(&card->write);
468 lcs_cleanup_channel(&card->read);
469 }
470
471 /**
472 * Start channel.
473 */
474 static int
475 lcs_start_channel(struct lcs_channel *channel)
476 {
477 unsigned long flags;
478 int rc;
479
480 LCS_DBF_TEXT_(4, trace,"ssch%s", dev_name(&channel->ccwdev->dev));
481 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
482 rc = ccw_device_start(channel->ccwdev,
483 channel->ccws + channel->io_idx, 0, 0,
484 DOIO_DENY_PREFETCH | DOIO_ALLOW_SUSPEND);
485 if (rc == 0)
486 channel->state = LCS_CH_STATE_RUNNING;
487 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
488 if (rc) {
489 LCS_DBF_TEXT_(4,trace,"essh%s",
490 dev_name(&channel->ccwdev->dev));
491 dev_err(&channel->ccwdev->dev,
492 "Starting an LCS device resulted in an error,"
493 " rc=%d!\n", rc);
494 }
495 return rc;
496 }
497
498 static int
499 lcs_clear_channel(struct lcs_channel *channel)
500 {
501 unsigned long flags;
502 int rc;
503
504 LCS_DBF_TEXT(4,trace,"clearch");
505 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
506 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
507 rc = ccw_device_clear(channel->ccwdev, 0);
508 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
509 if (rc) {
510 LCS_DBF_TEXT_(4, trace, "ecsc%s",
511 dev_name(&channel->ccwdev->dev));
512 return rc;
513 }
514 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_CLEARED));
515 channel->state = LCS_CH_STATE_STOPPED;
516 return rc;
517 }
518
519
520 /**
521 * Stop channel.
522 */
523 static int
524 lcs_stop_channel(struct lcs_channel *channel)
525 {
526 unsigned long flags;
527 int rc;
528
529 if (channel->state == LCS_CH_STATE_STOPPED)
530 return 0;
531 LCS_DBF_TEXT(4,trace,"haltsch");
532 LCS_DBF_TEXT_(4, trace, "%s", dev_name(&channel->ccwdev->dev));
533 channel->state = LCS_CH_STATE_INIT;
534 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
535 rc = ccw_device_halt(channel->ccwdev, 0);
536 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
537 if (rc) {
538 LCS_DBF_TEXT_(4, trace, "ehsc%s",
539 dev_name(&channel->ccwdev->dev));
540 return rc;
541 }
542 /* Asynchronous halt initialted. Wait for its completion. */
543 wait_event(channel->wait_q, (channel->state == LCS_CH_STATE_HALTED));
544 lcs_clear_channel(channel);
545 return 0;
546 }
547
548 /**
549 * start read and write channel
550 */
551 static int
552 lcs_start_channels(struct lcs_card *card)
553 {
554 int rc;
555
556 LCS_DBF_TEXT(2, trace, "chstart");
557 /* start read channel */
558 rc = lcs_start_channel(&card->read);
559 if (rc)
560 return rc;
561 /* start write channel */
562 rc = lcs_start_channel(&card->write);
563 if (rc)
564 lcs_stop_channel(&card->read);
565 return rc;
566 }
567
568 /**
569 * stop read and write channel
570 */
571 static int
572 lcs_stop_channels(struct lcs_card *card)
573 {
574 LCS_DBF_TEXT(2, trace, "chhalt");
575 lcs_stop_channel(&card->read);
576 lcs_stop_channel(&card->write);
577 return 0;
578 }
579
580 /**
581 * Get empty buffer.
582 */
583 static struct lcs_buffer *
584 __lcs_get_buffer(struct lcs_channel *channel)
585 {
586 int index;
587
588 LCS_DBF_TEXT(5, trace, "_getbuff");
589 index = channel->io_idx;
590 do {
591 if (channel->iob[index].state == LCS_BUF_STATE_EMPTY) {
592 channel->iob[index].state = LCS_BUF_STATE_LOCKED;
593 return channel->iob + index;
594 }
595 index = (index + 1) & (LCS_NUM_BUFFS - 1);
596 } while (index != channel->io_idx);
597 return NULL;
598 }
599
600 static struct lcs_buffer *
601 lcs_get_buffer(struct lcs_channel *channel)
602 {
603 struct lcs_buffer *buffer;
604 unsigned long flags;
605
606 LCS_DBF_TEXT(5, trace, "getbuff");
607 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
608 buffer = __lcs_get_buffer(channel);
609 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
610 return buffer;
611 }
612
613 /**
614 * Resume channel program if the channel is suspended.
615 */
616 static int
617 __lcs_resume_channel(struct lcs_channel *channel)
618 {
619 int rc;
620
621 if (channel->state != LCS_CH_STATE_SUSPENDED)
622 return 0;
623 if (channel->ccws[channel->io_idx].flags & CCW_FLAG_SUSPEND)
624 return 0;
625 LCS_DBF_TEXT_(5, trace, "rsch%s", dev_name(&channel->ccwdev->dev));
626 rc = ccw_device_resume(channel->ccwdev);
627 if (rc) {
628 LCS_DBF_TEXT_(4, trace, "ersc%s",
629 dev_name(&channel->ccwdev->dev));
630 dev_err(&channel->ccwdev->dev,
631 "Sending data from the LCS device to the LAN failed"
632 " with rc=%d\n",rc);
633 } else
634 channel->state = LCS_CH_STATE_RUNNING;
635 return rc;
636
637 }
638
639 /**
640 * Make a buffer ready for processing.
641 */
642 static void __lcs_ready_buffer_bits(struct lcs_channel *channel, int index)
643 {
644 int prev, next;
645
646 LCS_DBF_TEXT(5, trace, "rdybits");
647 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
648 next = (index + 1) & (LCS_NUM_BUFFS - 1);
649 /* Check if we may clear the suspend bit of this buffer. */
650 if (channel->ccws[next].flags & CCW_FLAG_SUSPEND) {
651 /* Check if we have to set the PCI bit. */
652 if (!(channel->ccws[prev].flags & CCW_FLAG_SUSPEND))
653 /* Suspend bit of the previous buffer is not set. */
654 channel->ccws[index].flags |= CCW_FLAG_PCI;
655 /* Suspend bit of the next buffer is set. */
656 channel->ccws[index].flags &= ~CCW_FLAG_SUSPEND;
657 }
658 }
659
660 static int
661 lcs_ready_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
662 {
663 unsigned long flags;
664 int index, rc;
665
666 LCS_DBF_TEXT(5, trace, "rdybuff");
667 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
668 buffer->state != LCS_BUF_STATE_PROCESSED);
669 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
670 buffer->state = LCS_BUF_STATE_READY;
671 index = buffer - channel->iob;
672 /* Set length. */
673 channel->ccws[index].count = buffer->count;
674 /* Check relevant PCI/suspend bits. */
675 __lcs_ready_buffer_bits(channel, index);
676 rc = __lcs_resume_channel(channel);
677 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
678 return rc;
679 }
680
681 /**
682 * Mark the buffer as processed. Take care of the suspend bit
683 * of the previous buffer. This function is called from
684 * interrupt context, so the lock must not be taken.
685 */
686 static int
687 __lcs_processed_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
688 {
689 int index, prev, next;
690
691 LCS_DBF_TEXT(5, trace, "prcsbuff");
692 BUG_ON(buffer->state != LCS_BUF_STATE_READY);
693 buffer->state = LCS_BUF_STATE_PROCESSED;
694 index = buffer - channel->iob;
695 prev = (index - 1) & (LCS_NUM_BUFFS - 1);
696 next = (index + 1) & (LCS_NUM_BUFFS - 1);
697 /* Set the suspend bit and clear the PCI bit of this buffer. */
698 channel->ccws[index].flags |= CCW_FLAG_SUSPEND;
699 channel->ccws[index].flags &= ~CCW_FLAG_PCI;
700 /* Check the suspend bit of the previous buffer. */
701 if (channel->iob[prev].state == LCS_BUF_STATE_READY) {
702 /*
703 * Previous buffer is in state ready. It might have
704 * happened in lcs_ready_buffer that the suspend bit
705 * has not been cleared to avoid an endless loop.
706 * Do it now.
707 */
708 __lcs_ready_buffer_bits(channel, prev);
709 }
710 /* Clear PCI bit of next buffer. */
711 channel->ccws[next].flags &= ~CCW_FLAG_PCI;
712 return __lcs_resume_channel(channel);
713 }
714
715 /**
716 * Put a processed buffer back to state empty.
717 */
718 static void
719 lcs_release_buffer(struct lcs_channel *channel, struct lcs_buffer *buffer)
720 {
721 unsigned long flags;
722
723 LCS_DBF_TEXT(5, trace, "relbuff");
724 BUG_ON(buffer->state != LCS_BUF_STATE_LOCKED &&
725 buffer->state != LCS_BUF_STATE_PROCESSED);
726 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
727 buffer->state = LCS_BUF_STATE_EMPTY;
728 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
729 }
730
731 /**
732 * Get buffer for a lan command.
733 */
734 static struct lcs_buffer *
735 lcs_get_lancmd(struct lcs_card *card, int count)
736 {
737 struct lcs_buffer *buffer;
738 struct lcs_cmd *cmd;
739
740 LCS_DBF_TEXT(4, trace, "getlncmd");
741 /* Get buffer and wait if none is available. */
742 wait_event(card->write.wait_q,
743 ((buffer = lcs_get_buffer(&card->write)) != NULL));
744 count += sizeof(struct lcs_header);
745 *(__u16 *)(buffer->data + count) = 0;
746 buffer->count = count + sizeof(__u16);
747 buffer->callback = lcs_release_buffer;
748 cmd = (struct lcs_cmd *) buffer->data;
749 cmd->offset = count;
750 cmd->type = LCS_FRAME_TYPE_CONTROL;
751 cmd->slot = 0;
752 return buffer;
753 }
754
755
756 static void
757 lcs_get_reply(struct lcs_reply *reply)
758 {
759 refcount_inc(&reply->refcnt);
760 }
761
762 static void
763 lcs_put_reply(struct lcs_reply *reply)
764 {
765 if (refcount_dec_and_test(&reply->refcnt))
766 kfree(reply);
767 }
768
769 static struct lcs_reply *
770 lcs_alloc_reply(struct lcs_cmd *cmd)
771 {
772 struct lcs_reply *reply;
773
774 LCS_DBF_TEXT(4, trace, "getreply");
775
776 reply = kzalloc(sizeof(struct lcs_reply), GFP_ATOMIC);
777 if (!reply)
778 return NULL;
779 refcount_set(&reply->refcnt, 1);
780 reply->sequence_no = cmd->sequence_no;
781 reply->received = 0;
782 reply->rc = 0;
783 init_waitqueue_head(&reply->wait_q);
784
785 return reply;
786 }
787
788 /**
789 * Notifier function for lancmd replies. Called from read irq.
790 */
791 static void
792 lcs_notify_lancmd_waiters(struct lcs_card *card, struct lcs_cmd *cmd)
793 {
794 struct list_head *l, *n;
795 struct lcs_reply *reply;
796
797 LCS_DBF_TEXT(4, trace, "notiwait");
798 spin_lock(&card->lock);
799 list_for_each_safe(l, n, &card->lancmd_waiters) {
800 reply = list_entry(l, struct lcs_reply, list);
801 if (reply->sequence_no == cmd->sequence_no) {
802 lcs_get_reply(reply);
803 list_del_init(&reply->list);
804 if (reply->callback != NULL)
805 reply->callback(card, cmd);
806 reply->received = 1;
807 reply->rc = cmd->return_code;
808 wake_up(&reply->wait_q);
809 lcs_put_reply(reply);
810 break;
811 }
812 }
813 spin_unlock(&card->lock);
814 }
815
816 /**
817 * Emit buffer of a lan command.
818 */
819 static void
820 lcs_lancmd_timeout(struct timer_list *t)
821 {
822 struct lcs_reply *reply = from_timer(reply, t, timer);
823 struct lcs_reply *list_reply, *r;
824 unsigned long flags;
825
826 LCS_DBF_TEXT(4, trace, "timeout");
827 spin_lock_irqsave(&reply->card->lock, flags);
828 list_for_each_entry_safe(list_reply, r,
829 &reply->card->lancmd_waiters,list) {
830 if (reply == list_reply) {
831 lcs_get_reply(reply);
832 list_del_init(&reply->list);
833 spin_unlock_irqrestore(&reply->card->lock, flags);
834 reply->received = 1;
835 reply->rc = -ETIME;
836 wake_up(&reply->wait_q);
837 lcs_put_reply(reply);
838 return;
839 }
840 }
841 spin_unlock_irqrestore(&reply->card->lock, flags);
842 }
843
844 static int
845 lcs_send_lancmd(struct lcs_card *card, struct lcs_buffer *buffer,
846 void (*reply_callback)(struct lcs_card *, struct lcs_cmd *))
847 {
848 struct lcs_reply *reply;
849 struct lcs_cmd *cmd;
850 unsigned long flags;
851 int rc;
852
853 LCS_DBF_TEXT(4, trace, "sendcmd");
854 cmd = (struct lcs_cmd *) buffer->data;
855 cmd->return_code = 0;
856 cmd->sequence_no = card->sequence_no++;
857 reply = lcs_alloc_reply(cmd);
858 if (!reply)
859 return -ENOMEM;
860 reply->callback = reply_callback;
861 reply->card = card;
862 spin_lock_irqsave(&card->lock, flags);
863 list_add_tail(&reply->list, &card->lancmd_waiters);
864 spin_unlock_irqrestore(&card->lock, flags);
865
866 buffer->callback = lcs_release_buffer;
867 rc = lcs_ready_buffer(&card->write, buffer);
868 if (rc)
869 return rc;
870 timer_setup(&reply->timer, lcs_lancmd_timeout, 0);
871 mod_timer(&reply->timer, jiffies + HZ * card->lancmd_timeout);
872 wait_event(reply->wait_q, reply->received);
873 del_timer_sync(&reply->timer);
874 LCS_DBF_TEXT_(4, trace, "rc:%d",reply->rc);
875 rc = reply->rc;
876 lcs_put_reply(reply);
877 return rc ? -EIO : 0;
878 }
879
880 /**
881 * LCS startup command
882 */
883 static int
884 lcs_send_startup(struct lcs_card *card, __u8 initiator)
885 {
886 struct lcs_buffer *buffer;
887 struct lcs_cmd *cmd;
888
889 LCS_DBF_TEXT(2, trace, "startup");
890 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
891 cmd = (struct lcs_cmd *) buffer->data;
892 cmd->cmd_code = LCS_CMD_STARTUP;
893 cmd->initiator = initiator;
894 cmd->cmd.lcs_startup.buff_size = LCS_IOBUFFERSIZE;
895 return lcs_send_lancmd(card, buffer, NULL);
896 }
897
898 /**
899 * LCS shutdown command
900 */
901 static int
902 lcs_send_shutdown(struct lcs_card *card)
903 {
904 struct lcs_buffer *buffer;
905 struct lcs_cmd *cmd;
906
907 LCS_DBF_TEXT(2, trace, "shutdown");
908 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
909 cmd = (struct lcs_cmd *) buffer->data;
910 cmd->cmd_code = LCS_CMD_SHUTDOWN;
911 cmd->initiator = LCS_INITIATOR_TCPIP;
912 return lcs_send_lancmd(card, buffer, NULL);
913 }
914
915 /**
916 * LCS lanstat command
917 */
918 static void
919 __lcs_lanstat_cb(struct lcs_card *card, struct lcs_cmd *cmd)
920 {
921 LCS_DBF_TEXT(2, trace, "statcb");
922 memcpy(card->mac, cmd->cmd.lcs_lanstat_cmd.mac_addr, LCS_MAC_LENGTH);
923 }
924
925 static int
926 lcs_send_lanstat(struct lcs_card *card)
927 {
928 struct lcs_buffer *buffer;
929 struct lcs_cmd *cmd;
930
931 LCS_DBF_TEXT(2,trace, "cmdstat");
932 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
933 cmd = (struct lcs_cmd *) buffer->data;
934 /* Setup lanstat command. */
935 cmd->cmd_code = LCS_CMD_LANSTAT;
936 cmd->initiator = LCS_INITIATOR_TCPIP;
937 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
938 cmd->cmd.lcs_std_cmd.portno = card->portno;
939 return lcs_send_lancmd(card, buffer, __lcs_lanstat_cb);
940 }
941
942 /**
943 * send stoplan command
944 */
945 static int
946 lcs_send_stoplan(struct lcs_card *card, __u8 initiator)
947 {
948 struct lcs_buffer *buffer;
949 struct lcs_cmd *cmd;
950
951 LCS_DBF_TEXT(2, trace, "cmdstpln");
952 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
953 cmd = (struct lcs_cmd *) buffer->data;
954 cmd->cmd_code = LCS_CMD_STOPLAN;
955 cmd->initiator = initiator;
956 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
957 cmd->cmd.lcs_std_cmd.portno = card->portno;
958 return lcs_send_lancmd(card, buffer, NULL);
959 }
960
961 /**
962 * send startlan command
963 */
964 static void
965 __lcs_send_startlan_cb(struct lcs_card *card, struct lcs_cmd *cmd)
966 {
967 LCS_DBF_TEXT(2, trace, "srtlancb");
968 card->lan_type = cmd->cmd.lcs_std_cmd.lan_type;
969 card->portno = cmd->cmd.lcs_std_cmd.portno;
970 }
971
972 static int
973 lcs_send_startlan(struct lcs_card *card, __u8 initiator)
974 {
975 struct lcs_buffer *buffer;
976 struct lcs_cmd *cmd;
977
978 LCS_DBF_TEXT(2, trace, "cmdstaln");
979 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
980 cmd = (struct lcs_cmd *) buffer->data;
981 cmd->cmd_code = LCS_CMD_STARTLAN;
982 cmd->initiator = initiator;
983 cmd->cmd.lcs_std_cmd.lan_type = card->lan_type;
984 cmd->cmd.lcs_std_cmd.portno = card->portno;
985 return lcs_send_lancmd(card, buffer, __lcs_send_startlan_cb);
986 }
987
988 #ifdef CONFIG_IP_MULTICAST
989 /**
990 * send setipm command (Multicast)
991 */
992 static int
993 lcs_send_setipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
994 {
995 struct lcs_buffer *buffer;
996 struct lcs_cmd *cmd;
997
998 LCS_DBF_TEXT(2, trace, "cmdsetim");
999 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1000 cmd = (struct lcs_cmd *) buffer->data;
1001 cmd->cmd_code = LCS_CMD_SETIPM;
1002 cmd->initiator = LCS_INITIATOR_TCPIP;
1003 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1004 cmd->cmd.lcs_qipassist.portno = card->portno;
1005 cmd->cmd.lcs_qipassist.version = 4;
1006 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1007 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1008 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1009 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1010 return lcs_send_lancmd(card, buffer, NULL);
1011 }
1012
1013 /**
1014 * send delipm command (Multicast)
1015 */
1016 static int
1017 lcs_send_delipm(struct lcs_card *card,struct lcs_ipm_list *ipm_list)
1018 {
1019 struct lcs_buffer *buffer;
1020 struct lcs_cmd *cmd;
1021
1022 LCS_DBF_TEXT(2, trace, "cmddelim");
1023 buffer = lcs_get_lancmd(card, LCS_MULTICAST_CMD_SIZE);
1024 cmd = (struct lcs_cmd *) buffer->data;
1025 cmd->cmd_code = LCS_CMD_DELIPM;
1026 cmd->initiator = LCS_INITIATOR_TCPIP;
1027 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1028 cmd->cmd.lcs_qipassist.portno = card->portno;
1029 cmd->cmd.lcs_qipassist.version = 4;
1030 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1031 memcpy(cmd->cmd.lcs_qipassist.lcs_ipass_ctlmsg.ip_mac_pair,
1032 &ipm_list->ipm, sizeof (struct lcs_ip_mac_pair));
1033 LCS_DBF_TEXT_(2, trace, "%x",ipm_list->ipm.ip_addr);
1034 return lcs_send_lancmd(card, buffer, NULL);
1035 }
1036
1037 /**
1038 * check if multicast is supported by LCS
1039 */
1040 static void
1041 __lcs_check_multicast_cb(struct lcs_card *card, struct lcs_cmd *cmd)
1042 {
1043 LCS_DBF_TEXT(2, trace, "chkmccb");
1044 card->ip_assists_supported =
1045 cmd->cmd.lcs_qipassist.ip_assists_supported;
1046 card->ip_assists_enabled =
1047 cmd->cmd.lcs_qipassist.ip_assists_enabled;
1048 }
1049
1050 static int
1051 lcs_check_multicast_support(struct lcs_card *card)
1052 {
1053 struct lcs_buffer *buffer;
1054 struct lcs_cmd *cmd;
1055 int rc;
1056
1057 LCS_DBF_TEXT(2, trace, "cmdqipa");
1058 /* Send query ipassist. */
1059 buffer = lcs_get_lancmd(card, LCS_STD_CMD_SIZE);
1060 cmd = (struct lcs_cmd *) buffer->data;
1061 cmd->cmd_code = LCS_CMD_QIPASSIST;
1062 cmd->initiator = LCS_INITIATOR_TCPIP;
1063 cmd->cmd.lcs_qipassist.lan_type = card->lan_type;
1064 cmd->cmd.lcs_qipassist.portno = card->portno;
1065 cmd->cmd.lcs_qipassist.version = 4;
1066 cmd->cmd.lcs_qipassist.num_ip_pairs = 1;
1067 rc = lcs_send_lancmd(card, buffer, __lcs_check_multicast_cb);
1068 if (rc != 0) {
1069 pr_err("Query IPAssist failed. Assuming unsupported!\n");
1070 return -EOPNOTSUPP;
1071 }
1072 if (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT)
1073 return 0;
1074 return -EOPNOTSUPP;
1075 }
1076
1077 /**
1078 * set or del multicast address on LCS card
1079 */
1080 static void
1081 lcs_fix_multicast_list(struct lcs_card *card)
1082 {
1083 struct list_head failed_list;
1084 struct lcs_ipm_list *ipm, *tmp;
1085 unsigned long flags;
1086 int rc;
1087
1088 LCS_DBF_TEXT(4,trace, "fixipm");
1089 INIT_LIST_HEAD(&failed_list);
1090 spin_lock_irqsave(&card->ipm_lock, flags);
1091 list_modified:
1092 list_for_each_entry_safe(ipm, tmp, &card->ipm_list, list){
1093 switch (ipm->ipm_state) {
1094 case LCS_IPM_STATE_SET_REQUIRED:
1095 /* del from ipm_list so no one else can tamper with
1096 * this entry */
1097 list_del_init(&ipm->list);
1098 spin_unlock_irqrestore(&card->ipm_lock, flags);
1099 rc = lcs_send_setipm(card, ipm);
1100 spin_lock_irqsave(&card->ipm_lock, flags);
1101 if (rc) {
1102 pr_info("Adding multicast address failed."
1103 " Table possibly full!\n");
1104 /* store ipm in failed list -> will be added
1105 * to ipm_list again, so a retry will be done
1106 * during the next call of this function */
1107 list_add_tail(&ipm->list, &failed_list);
1108 } else {
1109 ipm->ipm_state = LCS_IPM_STATE_ON_CARD;
1110 /* re-insert into ipm_list */
1111 list_add_tail(&ipm->list, &card->ipm_list);
1112 }
1113 goto list_modified;
1114 case LCS_IPM_STATE_DEL_REQUIRED:
1115 list_del(&ipm->list);
1116 spin_unlock_irqrestore(&card->ipm_lock, flags);
1117 lcs_send_delipm(card, ipm);
1118 spin_lock_irqsave(&card->ipm_lock, flags);
1119 kfree(ipm);
1120 goto list_modified;
1121 case LCS_IPM_STATE_ON_CARD:
1122 break;
1123 }
1124 }
1125 /* re-insert all entries from the failed_list into ipm_list */
1126 list_for_each_entry_safe(ipm, tmp, &failed_list, list)
1127 list_move_tail(&ipm->list, &card->ipm_list);
1128
1129 spin_unlock_irqrestore(&card->ipm_lock, flags);
1130 }
1131
1132 /**
1133 * get mac address for the relevant Multicast address
1134 */
1135 static void
1136 lcs_get_mac_for_ipm(__be32 ipm, char *mac, struct net_device *dev)
1137 {
1138 LCS_DBF_TEXT(4,trace, "getmac");
1139 ip_eth_mc_map(ipm, mac);
1140 }
1141
1142 /**
1143 * function called by net device to handle multicast address relevant things
1144 */
1145 static void lcs_remove_mc_addresses(struct lcs_card *card,
1146 struct in_device *in4_dev)
1147 {
1148 struct ip_mc_list *im4;
1149 struct list_head *l;
1150 struct lcs_ipm_list *ipm;
1151 unsigned long flags;
1152 char buf[MAX_ADDR_LEN];
1153
1154 LCS_DBF_TEXT(4, trace, "remmclst");
1155 spin_lock_irqsave(&card->ipm_lock, flags);
1156 list_for_each(l, &card->ipm_list) {
1157 ipm = list_entry(l, struct lcs_ipm_list, list);
1158 for (im4 = rcu_dereference(in4_dev->mc_list);
1159 im4 != NULL; im4 = rcu_dereference(im4->next_rcu)) {
1160 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1161 if ( (ipm->ipm.ip_addr == im4->multiaddr) &&
1162 (memcmp(buf, &ipm->ipm.mac_addr,
1163 LCS_MAC_LENGTH) == 0) )
1164 break;
1165 }
1166 if (im4 == NULL)
1167 ipm->ipm_state = LCS_IPM_STATE_DEL_REQUIRED;
1168 }
1169 spin_unlock_irqrestore(&card->ipm_lock, flags);
1170 }
1171
1172 static struct lcs_ipm_list *lcs_check_addr_entry(struct lcs_card *card,
1173 struct ip_mc_list *im4,
1174 char *buf)
1175 {
1176 struct lcs_ipm_list *tmp, *ipm = NULL;
1177 struct list_head *l;
1178 unsigned long flags;
1179
1180 LCS_DBF_TEXT(4, trace, "chkmcent");
1181 spin_lock_irqsave(&card->ipm_lock, flags);
1182 list_for_each(l, &card->ipm_list) {
1183 tmp = list_entry(l, struct lcs_ipm_list, list);
1184 if ( (tmp->ipm.ip_addr == im4->multiaddr) &&
1185 (memcmp(buf, &tmp->ipm.mac_addr,
1186 LCS_MAC_LENGTH) == 0) ) {
1187 ipm = tmp;
1188 break;
1189 }
1190 }
1191 spin_unlock_irqrestore(&card->ipm_lock, flags);
1192 return ipm;
1193 }
1194
1195 static void lcs_set_mc_addresses(struct lcs_card *card,
1196 struct in_device *in4_dev)
1197 {
1198
1199 struct ip_mc_list *im4;
1200 struct lcs_ipm_list *ipm;
1201 char buf[MAX_ADDR_LEN];
1202 unsigned long flags;
1203
1204 LCS_DBF_TEXT(4, trace, "setmclst");
1205 for (im4 = rcu_dereference(in4_dev->mc_list); im4 != NULL;
1206 im4 = rcu_dereference(im4->next_rcu)) {
1207 lcs_get_mac_for_ipm(im4->multiaddr, buf, card->dev);
1208 ipm = lcs_check_addr_entry(card, im4, buf);
1209 if (ipm != NULL)
1210 continue; /* Address already in list. */
1211 ipm = kzalloc(sizeof(struct lcs_ipm_list), GFP_ATOMIC);
1212 if (ipm == NULL) {
1213 pr_info("Not enough memory to add"
1214 " new multicast entry!\n");
1215 break;
1216 }
1217 memcpy(&ipm->ipm.mac_addr, buf, LCS_MAC_LENGTH);
1218 ipm->ipm.ip_addr = im4->multiaddr;
1219 ipm->ipm_state = LCS_IPM_STATE_SET_REQUIRED;
1220 spin_lock_irqsave(&card->ipm_lock, flags);
1221 LCS_DBF_HEX(2,trace,&ipm->ipm.ip_addr,4);
1222 list_add(&ipm->list, &card->ipm_list);
1223 spin_unlock_irqrestore(&card->ipm_lock, flags);
1224 }
1225 }
1226
1227 static int
1228 lcs_register_mc_addresses(void *data)
1229 {
1230 struct lcs_card *card;
1231 struct in_device *in4_dev;
1232
1233 card = (struct lcs_card *) data;
1234
1235 if (!lcs_do_run_thread(card, LCS_SET_MC_THREAD))
1236 return 0;
1237 LCS_DBF_TEXT(4, trace, "regmulti");
1238
1239 in4_dev = in_dev_get(card->dev);
1240 if (in4_dev == NULL)
1241 goto out;
1242 rcu_read_lock();
1243 lcs_remove_mc_addresses(card,in4_dev);
1244 lcs_set_mc_addresses(card, in4_dev);
1245 rcu_read_unlock();
1246 in_dev_put(in4_dev);
1247
1248 netif_carrier_off(card->dev);
1249 netif_tx_disable(card->dev);
1250 wait_event(card->write.wait_q,
1251 (card->write.state != LCS_CH_STATE_RUNNING));
1252 lcs_fix_multicast_list(card);
1253 if (card->state == DEV_STATE_UP) {
1254 netif_carrier_on(card->dev);
1255 netif_wake_queue(card->dev);
1256 }
1257 out:
1258 lcs_clear_thread_running_bit(card, LCS_SET_MC_THREAD);
1259 return 0;
1260 }
1261 #endif /* CONFIG_IP_MULTICAST */
1262
1263 /**
1264 * function called by net device to
1265 * handle multicast address relevant things
1266 */
1267 static void
1268 lcs_set_multicast_list(struct net_device *dev)
1269 {
1270 #ifdef CONFIG_IP_MULTICAST
1271 struct lcs_card *card;
1272
1273 LCS_DBF_TEXT(4, trace, "setmulti");
1274 card = (struct lcs_card *) dev->ml_priv;
1275
1276 if (!lcs_set_thread_start_bit(card, LCS_SET_MC_THREAD))
1277 schedule_work(&card->kernel_thread_starter);
1278 #endif /* CONFIG_IP_MULTICAST */
1279 }
1280
1281 static long
1282 lcs_check_irb_error(struct ccw_device *cdev, struct irb *irb)
1283 {
1284 if (!IS_ERR(irb))
1285 return 0;
1286
1287 switch (PTR_ERR(irb)) {
1288 case -EIO:
1289 dev_warn(&cdev->dev,
1290 "An I/O-error occurred on the LCS device\n");
1291 LCS_DBF_TEXT(2, trace, "ckirberr");
1292 LCS_DBF_TEXT_(2, trace, " rc%d", -EIO);
1293 break;
1294 case -ETIMEDOUT:
1295 dev_warn(&cdev->dev,
1296 "A command timed out on the LCS device\n");
1297 LCS_DBF_TEXT(2, trace, "ckirberr");
1298 LCS_DBF_TEXT_(2, trace, " rc%d", -ETIMEDOUT);
1299 break;
1300 default:
1301 dev_warn(&cdev->dev,
1302 "An error occurred on the LCS device, rc=%ld\n",
1303 PTR_ERR(irb));
1304 LCS_DBF_TEXT(2, trace, "ckirberr");
1305 LCS_DBF_TEXT(2, trace, " rc???");
1306 }
1307 return PTR_ERR(irb);
1308 }
1309
1310 static int
1311 lcs_get_problem(struct ccw_device *cdev, struct irb *irb)
1312 {
1313 int dstat, cstat;
1314 char *sense;
1315
1316 sense = (char *) irb->ecw;
1317 cstat = irb->scsw.cmd.cstat;
1318 dstat = irb->scsw.cmd.dstat;
1319
1320 if (cstat & (SCHN_STAT_CHN_CTRL_CHK | SCHN_STAT_INTF_CTRL_CHK |
1321 SCHN_STAT_CHN_DATA_CHK | SCHN_STAT_CHAIN_CHECK |
1322 SCHN_STAT_PROT_CHECK | SCHN_STAT_PROG_CHECK)) {
1323 LCS_DBF_TEXT(2, trace, "CGENCHK");
1324 return 1;
1325 }
1326 if (dstat & DEV_STAT_UNIT_CHECK) {
1327 if (sense[LCS_SENSE_BYTE_1] &
1328 LCS_SENSE_RESETTING_EVENT) {
1329 LCS_DBF_TEXT(2, trace, "REVIND");
1330 return 1;
1331 }
1332 if (sense[LCS_SENSE_BYTE_0] &
1333 LCS_SENSE_CMD_REJECT) {
1334 LCS_DBF_TEXT(2, trace, "CMDREJ");
1335 return 0;
1336 }
1337 if ((!sense[LCS_SENSE_BYTE_0]) &&
1338 (!sense[LCS_SENSE_BYTE_1]) &&
1339 (!sense[LCS_SENSE_BYTE_2]) &&
1340 (!sense[LCS_SENSE_BYTE_3])) {
1341 LCS_DBF_TEXT(2, trace, "ZEROSEN");
1342 return 0;
1343 }
1344 LCS_DBF_TEXT(2, trace, "DGENCHK");
1345 return 1;
1346 }
1347 return 0;
1348 }
1349
1350 static void
1351 lcs_schedule_recovery(struct lcs_card *card)
1352 {
1353 LCS_DBF_TEXT(2, trace, "startrec");
1354 if (!lcs_set_thread_start_bit(card, LCS_RECOVERY_THREAD))
1355 schedule_work(&card->kernel_thread_starter);
1356 }
1357
1358 /**
1359 * IRQ Handler for LCS channels
1360 */
1361 static void
1362 lcs_irq(struct ccw_device *cdev, unsigned long intparm, struct irb *irb)
1363 {
1364 struct lcs_card *card;
1365 struct lcs_channel *channel;
1366 int rc, index;
1367 int cstat, dstat;
1368
1369 if (lcs_check_irb_error(cdev, irb))
1370 return;
1371
1372 card = CARD_FROM_DEV(cdev);
1373 if (card->read.ccwdev == cdev)
1374 channel = &card->read;
1375 else
1376 channel = &card->write;
1377
1378 cstat = irb->scsw.cmd.cstat;
1379 dstat = irb->scsw.cmd.dstat;
1380 LCS_DBF_TEXT_(5, trace, "Rint%s", dev_name(&cdev->dev));
1381 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.cstat,
1382 irb->scsw.cmd.dstat);
1383 LCS_DBF_TEXT_(5, trace, "%4x%4x", irb->scsw.cmd.fctl,
1384 irb->scsw.cmd.actl);
1385
1386 /* Check for channel and device errors presented */
1387 rc = lcs_get_problem(cdev, irb);
1388 if (rc || (dstat & DEV_STAT_UNIT_EXCEP)) {
1389 dev_warn(&cdev->dev,
1390 "The LCS device stopped because of an error,"
1391 " dstat=0x%X, cstat=0x%X \n",
1392 dstat, cstat);
1393 if (rc) {
1394 channel->state = LCS_CH_STATE_ERROR;
1395 }
1396 }
1397 if (channel->state == LCS_CH_STATE_ERROR) {
1398 lcs_schedule_recovery(card);
1399 wake_up(&card->wait_q);
1400 return;
1401 }
1402 /* How far in the ccw chain have we processed? */
1403 if ((channel->state != LCS_CH_STATE_INIT) &&
1404 (irb->scsw.cmd.fctl & SCSW_FCTL_START_FUNC) &&
1405 (irb->scsw.cmd.cpa != 0)) {
1406 index = (struct ccw1 *) __va((addr_t) irb->scsw.cmd.cpa)
1407 - channel->ccws;
1408 if ((irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED) ||
1409 (irb->scsw.cmd.cstat & SCHN_STAT_PCI))
1410 /* Bloody io subsystem tells us lies about cpa... */
1411 index = (index - 1) & (LCS_NUM_BUFFS - 1);
1412 while (channel->io_idx != index) {
1413 __lcs_processed_buffer(channel,
1414 channel->iob + channel->io_idx);
1415 channel->io_idx =
1416 (channel->io_idx + 1) & (LCS_NUM_BUFFS - 1);
1417 }
1418 }
1419
1420 if ((irb->scsw.cmd.dstat & DEV_STAT_DEV_END) ||
1421 (irb->scsw.cmd.dstat & DEV_STAT_CHN_END) ||
1422 (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK))
1423 /* Mark channel as stopped. */
1424 channel->state = LCS_CH_STATE_STOPPED;
1425 else if (irb->scsw.cmd.actl & SCSW_ACTL_SUSPENDED)
1426 /* CCW execution stopped on a suspend bit. */
1427 channel->state = LCS_CH_STATE_SUSPENDED;
1428 if (irb->scsw.cmd.fctl & SCSW_FCTL_HALT_FUNC) {
1429 if (irb->scsw.cmd.cc != 0) {
1430 ccw_device_halt(channel->ccwdev, 0);
1431 return;
1432 }
1433 /* The channel has been stopped by halt_IO. */
1434 channel->state = LCS_CH_STATE_HALTED;
1435 }
1436 if (irb->scsw.cmd.fctl & SCSW_FCTL_CLEAR_FUNC)
1437 channel->state = LCS_CH_STATE_CLEARED;
1438 /* Do the rest in the tasklet. */
1439 tasklet_schedule(&channel->irq_tasklet);
1440 }
1441
1442 /**
1443 * Tasklet for IRQ handler
1444 */
1445 static void
1446 lcs_tasklet(unsigned long data)
1447 {
1448 unsigned long flags;
1449 struct lcs_channel *channel;
1450 struct lcs_buffer *iob;
1451 int buf_idx;
1452
1453 channel = (struct lcs_channel *) data;
1454 LCS_DBF_TEXT_(5, trace, "tlet%s", dev_name(&channel->ccwdev->dev));
1455
1456 /* Check for processed buffers. */
1457 iob = channel->iob;
1458 buf_idx = channel->buf_idx;
1459 while (iob[buf_idx].state == LCS_BUF_STATE_PROCESSED) {
1460 /* Do the callback thing. */
1461 if (iob[buf_idx].callback != NULL)
1462 iob[buf_idx].callback(channel, iob + buf_idx);
1463 buf_idx = (buf_idx + 1) & (LCS_NUM_BUFFS - 1);
1464 }
1465 channel->buf_idx = buf_idx;
1466
1467 if (channel->state == LCS_CH_STATE_STOPPED)
1468 lcs_start_channel(channel);
1469 spin_lock_irqsave(get_ccwdev_lock(channel->ccwdev), flags);
1470 if (channel->state == LCS_CH_STATE_SUSPENDED &&
1471 channel->iob[channel->io_idx].state == LCS_BUF_STATE_READY)
1472 __lcs_resume_channel(channel);
1473 spin_unlock_irqrestore(get_ccwdev_lock(channel->ccwdev), flags);
1474
1475 /* Something happened on the channel. Wake up waiters. */
1476 wake_up(&channel->wait_q);
1477 }
1478
1479 /**
1480 * Finish current tx buffer and make it ready for transmit.
1481 */
1482 static void
1483 __lcs_emit_txbuffer(struct lcs_card *card)
1484 {
1485 LCS_DBF_TEXT(5, trace, "emittx");
1486 *(__u16 *)(card->tx_buffer->data + card->tx_buffer->count) = 0;
1487 card->tx_buffer->count += 2;
1488 lcs_ready_buffer(&card->write, card->tx_buffer);
1489 card->tx_buffer = NULL;
1490 card->tx_emitted++;
1491 }
1492
1493 /**
1494 * Callback for finished tx buffers.
1495 */
1496 static void
1497 lcs_txbuffer_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1498 {
1499 struct lcs_card *card;
1500
1501 LCS_DBF_TEXT(5, trace, "txbuffcb");
1502 /* Put buffer back to pool. */
1503 lcs_release_buffer(channel, buffer);
1504 card = container_of(channel, struct lcs_card, write);
1505 if (netif_queue_stopped(card->dev) && netif_carrier_ok(card->dev))
1506 netif_wake_queue(card->dev);
1507 spin_lock(&card->lock);
1508 card->tx_emitted--;
1509 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1510 /*
1511 * Last running tx buffer has finished. Submit partially
1512 * filled current buffer.
1513 */
1514 __lcs_emit_txbuffer(card);
1515 spin_unlock(&card->lock);
1516 }
1517
1518 /**
1519 * Packet transmit function called by network stack
1520 */
1521 static int
1522 __lcs_start_xmit(struct lcs_card *card, struct sk_buff *skb,
1523 struct net_device *dev)
1524 {
1525 struct lcs_header *header;
1526 int rc = NETDEV_TX_OK;
1527
1528 LCS_DBF_TEXT(5, trace, "hardxmit");
1529 if (skb == NULL) {
1530 card->stats.tx_dropped++;
1531 card->stats.tx_errors++;
1532 return NETDEV_TX_OK;
1533 }
1534 if (card->state != DEV_STATE_UP) {
1535 dev_kfree_skb(skb);
1536 card->stats.tx_dropped++;
1537 card->stats.tx_errors++;
1538 card->stats.tx_carrier_errors++;
1539 return NETDEV_TX_OK;
1540 }
1541 if (skb->protocol == htons(ETH_P_IPV6)) {
1542 dev_kfree_skb(skb);
1543 return NETDEV_TX_OK;
1544 }
1545 netif_stop_queue(card->dev);
1546 spin_lock(&card->lock);
1547 if (card->tx_buffer != NULL &&
1548 card->tx_buffer->count + sizeof(struct lcs_header) +
1549 skb->len + sizeof(u16) > LCS_IOBUFFERSIZE)
1550 /* skb too big for current tx buffer. */
1551 __lcs_emit_txbuffer(card);
1552 if (card->tx_buffer == NULL) {
1553 /* Get new tx buffer */
1554 card->tx_buffer = lcs_get_buffer(&card->write);
1555 if (card->tx_buffer == NULL) {
1556 card->stats.tx_dropped++;
1557 rc = NETDEV_TX_BUSY;
1558 goto out;
1559 }
1560 card->tx_buffer->callback = lcs_txbuffer_cb;
1561 card->tx_buffer->count = 0;
1562 }
1563 header = (struct lcs_header *)
1564 (card->tx_buffer->data + card->tx_buffer->count);
1565 card->tx_buffer->count += skb->len + sizeof(struct lcs_header);
1566 header->offset = card->tx_buffer->count;
1567 header->type = card->lan_type;
1568 header->slot = card->portno;
1569 skb_copy_from_linear_data(skb, header + 1, skb->len);
1570 spin_unlock(&card->lock);
1571 card->stats.tx_bytes += skb->len;
1572 card->stats.tx_packets++;
1573 dev_kfree_skb(skb);
1574 netif_wake_queue(card->dev);
1575 spin_lock(&card->lock);
1576 if (card->tx_emitted <= 0 && card->tx_buffer != NULL)
1577 /* If this is the first tx buffer emit it immediately. */
1578 __lcs_emit_txbuffer(card);
1579 out:
1580 spin_unlock(&card->lock);
1581 return rc;
1582 }
1583
1584 static int
1585 lcs_start_xmit(struct sk_buff *skb, struct net_device *dev)
1586 {
1587 struct lcs_card *card;
1588 int rc;
1589
1590 LCS_DBF_TEXT(5, trace, "pktxmit");
1591 card = (struct lcs_card *) dev->ml_priv;
1592 rc = __lcs_start_xmit(card, skb, dev);
1593 return rc;
1594 }
1595
1596 /**
1597 * send startlan and lanstat command to make LCS device ready
1598 */
1599 static int
1600 lcs_startlan_auto(struct lcs_card *card)
1601 {
1602 int rc;
1603
1604 LCS_DBF_TEXT(2, trace, "strtauto");
1605 #ifdef CONFIG_ETHERNET
1606 card->lan_type = LCS_FRAME_TYPE_ENET;
1607 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1608 if (rc == 0)
1609 return 0;
1610
1611 #endif
1612 #ifdef CONFIG_FDDI
1613 card->lan_type = LCS_FRAME_TYPE_FDDI;
1614 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1615 if (rc == 0)
1616 return 0;
1617 #endif
1618 return -EIO;
1619 }
1620
1621 static int
1622 lcs_startlan(struct lcs_card *card)
1623 {
1624 int rc, i;
1625
1626 LCS_DBF_TEXT(2, trace, "startlan");
1627 rc = 0;
1628 if (card->portno != LCS_INVALID_PORT_NO) {
1629 if (card->lan_type == LCS_FRAME_TYPE_AUTO)
1630 rc = lcs_startlan_auto(card);
1631 else
1632 rc = lcs_send_startlan(card, LCS_INITIATOR_TCPIP);
1633 } else {
1634 for (i = 0; i <= 16; i++) {
1635 card->portno = i;
1636 if (card->lan_type != LCS_FRAME_TYPE_AUTO)
1637 rc = lcs_send_startlan(card,
1638 LCS_INITIATOR_TCPIP);
1639 else
1640 /* autodetecting lan type */
1641 rc = lcs_startlan_auto(card);
1642 if (rc == 0)
1643 break;
1644 }
1645 }
1646 if (rc == 0)
1647 return lcs_send_lanstat(card);
1648 return rc;
1649 }
1650
1651 /**
1652 * LCS detect function
1653 * setup channels and make them I/O ready
1654 */
1655 static int
1656 lcs_detect(struct lcs_card *card)
1657 {
1658 int rc = 0;
1659
1660 LCS_DBF_TEXT(2, setup, "lcsdetct");
1661 /* start/reset card */
1662 if (card->dev)
1663 netif_stop_queue(card->dev);
1664 rc = lcs_stop_channels(card);
1665 if (rc == 0) {
1666 rc = lcs_start_channels(card);
1667 if (rc == 0) {
1668 rc = lcs_send_startup(card, LCS_INITIATOR_TCPIP);
1669 if (rc == 0)
1670 rc = lcs_startlan(card);
1671 }
1672 }
1673 if (rc == 0) {
1674 card->state = DEV_STATE_UP;
1675 } else {
1676 card->state = DEV_STATE_DOWN;
1677 card->write.state = LCS_CH_STATE_INIT;
1678 card->read.state = LCS_CH_STATE_INIT;
1679 }
1680 return rc;
1681 }
1682
1683 /**
1684 * LCS Stop card
1685 */
1686 static int
1687 lcs_stopcard(struct lcs_card *card)
1688 {
1689 int rc;
1690
1691 LCS_DBF_TEXT(3, setup, "stopcard");
1692
1693 if (card->read.state != LCS_CH_STATE_STOPPED &&
1694 card->write.state != LCS_CH_STATE_STOPPED &&
1695 card->read.state != LCS_CH_STATE_ERROR &&
1696 card->write.state != LCS_CH_STATE_ERROR &&
1697 card->state == DEV_STATE_UP) {
1698 lcs_clear_multicast_list(card);
1699 rc = lcs_send_stoplan(card,LCS_INITIATOR_TCPIP);
1700 rc = lcs_send_shutdown(card);
1701 }
1702 rc = lcs_stop_channels(card);
1703 card->state = DEV_STATE_DOWN;
1704
1705 return rc;
1706 }
1707
1708 /**
1709 * Kernel Thread helper functions for LGW initiated commands
1710 */
1711 static void
1712 lcs_start_kernel_thread(struct work_struct *work)
1713 {
1714 struct lcs_card *card = container_of(work, struct lcs_card, kernel_thread_starter);
1715 LCS_DBF_TEXT(5, trace, "krnthrd");
1716 if (lcs_do_start_thread(card, LCS_RECOVERY_THREAD))
1717 kthread_run(lcs_recovery, card, "lcs_recover");
1718 #ifdef CONFIG_IP_MULTICAST
1719 if (lcs_do_start_thread(card, LCS_SET_MC_THREAD))
1720 kthread_run(lcs_register_mc_addresses, card, "regipm");
1721 #endif
1722 }
1723
1724 /**
1725 * Process control frames.
1726 */
1727 static void
1728 lcs_get_control(struct lcs_card *card, struct lcs_cmd *cmd)
1729 {
1730 LCS_DBF_TEXT(5, trace, "getctrl");
1731 if (cmd->initiator == LCS_INITIATOR_LGW) {
1732 switch(cmd->cmd_code) {
1733 case LCS_CMD_STARTUP:
1734 case LCS_CMD_STARTLAN:
1735 lcs_schedule_recovery(card);
1736 break;
1737 case LCS_CMD_STOPLAN:
1738 pr_warn("Stoplan for %s initiated by LGW\n",
1739 card->dev->name);
1740 if (card->dev)
1741 netif_carrier_off(card->dev);
1742 break;
1743 default:
1744 LCS_DBF_TEXT(5, trace, "noLGWcmd");
1745 break;
1746 }
1747 } else
1748 lcs_notify_lancmd_waiters(card, cmd);
1749 }
1750
1751 /**
1752 * Unpack network packet.
1753 */
1754 static void
1755 lcs_get_skb(struct lcs_card *card, char *skb_data, unsigned int skb_len)
1756 {
1757 struct sk_buff *skb;
1758
1759 LCS_DBF_TEXT(5, trace, "getskb");
1760 if (card->dev == NULL ||
1761 card->state != DEV_STATE_UP)
1762 /* The card isn't up. Ignore the packet. */
1763 return;
1764
1765 skb = dev_alloc_skb(skb_len);
1766 if (skb == NULL) {
1767 dev_err(&card->dev->dev,
1768 " Allocating a socket buffer to interface %s failed\n",
1769 card->dev->name);
1770 card->stats.rx_dropped++;
1771 return;
1772 }
1773 skb_put_data(skb, skb_data, skb_len);
1774 skb->protocol = card->lan_type_trans(skb, card->dev);
1775 card->stats.rx_bytes += skb_len;
1776 card->stats.rx_packets++;
1777 if (skb->protocol == htons(ETH_P_802_2))
1778 *((__u32 *)skb->cb) = ++card->pkt_seq;
1779 netif_rx(skb);
1780 }
1781
1782 /**
1783 * LCS main routine to get packets and lancmd replies from the buffers
1784 */
1785 static void
1786 lcs_get_frames_cb(struct lcs_channel *channel, struct lcs_buffer *buffer)
1787 {
1788 struct lcs_card *card;
1789 struct lcs_header *lcs_hdr;
1790 __u16 offset;
1791
1792 LCS_DBF_TEXT(5, trace, "lcsgtpkt");
1793 lcs_hdr = (struct lcs_header *) buffer->data;
1794 if (lcs_hdr->offset == LCS_ILLEGAL_OFFSET) {
1795 LCS_DBF_TEXT(4, trace, "-eiogpkt");
1796 return;
1797 }
1798 card = container_of(channel, struct lcs_card, read);
1799 offset = 0;
1800 while (lcs_hdr->offset != 0) {
1801 if (lcs_hdr->offset <= 0 ||
1802 lcs_hdr->offset > LCS_IOBUFFERSIZE ||
1803 lcs_hdr->offset < offset) {
1804 /* Offset invalid. */
1805 card->stats.rx_length_errors++;
1806 card->stats.rx_errors++;
1807 return;
1808 }
1809 /* What kind of frame is it? */
1810 if (lcs_hdr->type == LCS_FRAME_TYPE_CONTROL)
1811 /* Control frame. */
1812 lcs_get_control(card, (struct lcs_cmd *) lcs_hdr);
1813 else if (lcs_hdr->type == LCS_FRAME_TYPE_ENET ||
1814 lcs_hdr->type == LCS_FRAME_TYPE_TR ||
1815 lcs_hdr->type == LCS_FRAME_TYPE_FDDI)
1816 /* Normal network packet. */
1817 lcs_get_skb(card, (char *)(lcs_hdr + 1),
1818 lcs_hdr->offset - offset -
1819 sizeof(struct lcs_header));
1820 else
1821 /* Unknown frame type. */
1822 ; // FIXME: error message ?
1823 /* Proceed to next frame. */
1824 offset = lcs_hdr->offset;
1825 lcs_hdr->offset = LCS_ILLEGAL_OFFSET;
1826 lcs_hdr = (struct lcs_header *) (buffer->data + offset);
1827 }
1828 /* The buffer is now empty. Make it ready again. */
1829 lcs_ready_buffer(&card->read, buffer);
1830 }
1831
1832 /**
1833 * get network statistics for ifconfig and other user programs
1834 */
1835 static struct net_device_stats *
1836 lcs_getstats(struct net_device *dev)
1837 {
1838 struct lcs_card *card;
1839
1840 LCS_DBF_TEXT(4, trace, "netstats");
1841 card = (struct lcs_card *) dev->ml_priv;
1842 return &card->stats;
1843 }
1844
1845 /**
1846 * stop lcs device
1847 * This function will be called by user doing ifconfig xxx down
1848 */
1849 static int
1850 lcs_stop_device(struct net_device *dev)
1851 {
1852 struct lcs_card *card;
1853 int rc;
1854
1855 LCS_DBF_TEXT(2, trace, "stopdev");
1856 card = (struct lcs_card *) dev->ml_priv;
1857 netif_carrier_off(dev);
1858 netif_tx_disable(dev);
1859 dev->flags &= ~IFF_UP;
1860 wait_event(card->write.wait_q,
1861 (card->write.state != LCS_CH_STATE_RUNNING));
1862 rc = lcs_stopcard(card);
1863 if (rc)
1864 dev_err(&card->dev->dev,
1865 " Shutting down the LCS device failed\n");
1866 return rc;
1867 }
1868
1869 /**
1870 * start lcs device and make it runnable
1871 * This function will be called by user doing ifconfig xxx up
1872 */
1873 static int
1874 lcs_open_device(struct net_device *dev)
1875 {
1876 struct lcs_card *card;
1877 int rc;
1878
1879 LCS_DBF_TEXT(2, trace, "opendev");
1880 card = (struct lcs_card *) dev->ml_priv;
1881 /* initialize statistics */
1882 rc = lcs_detect(card);
1883 if (rc) {
1884 pr_err("Error in opening device!\n");
1885
1886 } else {
1887 dev->flags |= IFF_UP;
1888 netif_carrier_on(dev);
1889 netif_wake_queue(dev);
1890 card->state = DEV_STATE_UP;
1891 }
1892 return rc;
1893 }
1894
1895 /**
1896 * show function for portno called by cat or similar things
1897 */
1898 static ssize_t
1899 lcs_portno_show (struct device *dev, struct device_attribute *attr, char *buf)
1900 {
1901 struct lcs_card *card;
1902
1903 card = dev_get_drvdata(dev);
1904
1905 if (!card)
1906 return 0;
1907
1908 return sprintf(buf, "%d\n", card->portno);
1909 }
1910
1911 /**
1912 * store the value which is piped to file portno
1913 */
1914 static ssize_t
1915 lcs_portno_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1916 {
1917 struct lcs_card *card;
1918 int rc;
1919 s16 value;
1920
1921 card = dev_get_drvdata(dev);
1922
1923 if (!card)
1924 return 0;
1925
1926 rc = kstrtos16(buf, 0, &value);
1927 if (rc)
1928 return -EINVAL;
1929 /* TODO: sanity checks */
1930 card->portno = value;
1931 if (card->dev)
1932 card->dev->dev_port = card->portno;
1933
1934 return count;
1935
1936 }
1937
1938 static DEVICE_ATTR(portno, 0644, lcs_portno_show, lcs_portno_store);
1939
1940 static const char *lcs_type[] = {
1941 "not a channel",
1942 "2216 parallel",
1943 "2216 channel",
1944 "OSA LCS card",
1945 "unknown channel type",
1946 "unsupported channel type",
1947 };
1948
1949 static ssize_t
1950 lcs_type_show(struct device *dev, struct device_attribute *attr, char *buf)
1951 {
1952 struct ccwgroup_device *cgdev;
1953
1954 cgdev = to_ccwgroupdev(dev);
1955 if (!cgdev)
1956 return -ENODEV;
1957
1958 return sprintf(buf, "%s\n", lcs_type[cgdev->cdev[0]->id.driver_info]);
1959 }
1960
1961 static DEVICE_ATTR(type, 0444, lcs_type_show, NULL);
1962
1963 static ssize_t
1964 lcs_timeout_show(struct device *dev, struct device_attribute *attr, char *buf)
1965 {
1966 struct lcs_card *card;
1967
1968 card = dev_get_drvdata(dev);
1969
1970 return card ? sprintf(buf, "%u\n", card->lancmd_timeout) : 0;
1971 }
1972
1973 static ssize_t
1974 lcs_timeout_store (struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
1975 {
1976 struct lcs_card *card;
1977 unsigned int value;
1978 int rc;
1979
1980 card = dev_get_drvdata(dev);
1981
1982 if (!card)
1983 return 0;
1984
1985 rc = kstrtouint(buf, 0, &value);
1986 if (rc)
1987 return -EINVAL;
1988 /* TODO: sanity checks */
1989 card->lancmd_timeout = value;
1990
1991 return count;
1992
1993 }
1994
1995 static DEVICE_ATTR(lancmd_timeout, 0644, lcs_timeout_show, lcs_timeout_store);
1996
1997 static ssize_t
1998 lcs_dev_recover_store(struct device *dev, struct device_attribute *attr,
1999 const char *buf, size_t count)
2000 {
2001 struct lcs_card *card = dev_get_drvdata(dev);
2002 char *tmp;
2003 int i;
2004
2005 if (!card)
2006 return -EINVAL;
2007 if (card->state != DEV_STATE_UP)
2008 return -EPERM;
2009 i = simple_strtoul(buf, &tmp, 16);
2010 if (i == 1)
2011 lcs_schedule_recovery(card);
2012 return count;
2013 }
2014
2015 static DEVICE_ATTR(recover, 0200, NULL, lcs_dev_recover_store);
2016
2017 static struct attribute * lcs_attrs[] = {
2018 &dev_attr_portno.attr,
2019 &dev_attr_type.attr,
2020 &dev_attr_lancmd_timeout.attr,
2021 &dev_attr_recover.attr,
2022 NULL,
2023 };
2024 static struct attribute_group lcs_attr_group = {
2025 .attrs = lcs_attrs,
2026 };
2027 static const struct attribute_group *lcs_attr_groups[] = {
2028 &lcs_attr_group,
2029 NULL,
2030 };
2031 static const struct device_type lcs_devtype = {
2032 .name = "lcs",
2033 .groups = lcs_attr_groups,
2034 };
2035
2036 /**
2037 * lcs_probe_device is called on establishing a new ccwgroup_device.
2038 */
2039 static int
2040 lcs_probe_device(struct ccwgroup_device *ccwgdev)
2041 {
2042 struct lcs_card *card;
2043
2044 if (!get_device(&ccwgdev->dev))
2045 return -ENODEV;
2046
2047 LCS_DBF_TEXT(2, setup, "add_dev");
2048 card = lcs_alloc_card();
2049 if (!card) {
2050 LCS_DBF_TEXT_(2, setup, " rc%d", -ENOMEM);
2051 put_device(&ccwgdev->dev);
2052 return -ENOMEM;
2053 }
2054 dev_set_drvdata(&ccwgdev->dev, card);
2055 ccwgdev->cdev[0]->handler = lcs_irq;
2056 ccwgdev->cdev[1]->handler = lcs_irq;
2057 card->gdev = ccwgdev;
2058 INIT_WORK(&card->kernel_thread_starter, lcs_start_kernel_thread);
2059 card->thread_start_mask = 0;
2060 card->thread_allowed_mask = 0;
2061 card->thread_running_mask = 0;
2062 ccwgdev->dev.type = &lcs_devtype;
2063
2064 return 0;
2065 }
2066
2067 static int
2068 lcs_register_netdev(struct ccwgroup_device *ccwgdev)
2069 {
2070 struct lcs_card *card;
2071
2072 LCS_DBF_TEXT(2, setup, "regnetdv");
2073 card = dev_get_drvdata(&ccwgdev->dev);
2074 if (card->dev->reg_state != NETREG_UNINITIALIZED)
2075 return 0;
2076 SET_NETDEV_DEV(card->dev, &ccwgdev->dev);
2077 return register_netdev(card->dev);
2078 }
2079
2080 /**
2081 * lcs_new_device will be called by setting the group device online.
2082 */
2083 static const struct net_device_ops lcs_netdev_ops = {
2084 .ndo_open = lcs_open_device,
2085 .ndo_stop = lcs_stop_device,
2086 .ndo_get_stats = lcs_getstats,
2087 .ndo_start_xmit = lcs_start_xmit,
2088 };
2089
2090 static const struct net_device_ops lcs_mc_netdev_ops = {
2091 .ndo_open = lcs_open_device,
2092 .ndo_stop = lcs_stop_device,
2093 .ndo_get_stats = lcs_getstats,
2094 .ndo_start_xmit = lcs_start_xmit,
2095 .ndo_set_rx_mode = lcs_set_multicast_list,
2096 };
2097
2098 static int
2099 lcs_new_device(struct ccwgroup_device *ccwgdev)
2100 {
2101 struct lcs_card *card;
2102 struct net_device *dev=NULL;
2103 enum lcs_dev_states recover_state;
2104 int rc;
2105
2106 card = dev_get_drvdata(&ccwgdev->dev);
2107 if (!card)
2108 return -ENODEV;
2109
2110 LCS_DBF_TEXT(2, setup, "newdev");
2111 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2112 card->read.ccwdev = ccwgdev->cdev[0];
2113 card->write.ccwdev = ccwgdev->cdev[1];
2114
2115 recover_state = card->state;
2116 rc = ccw_device_set_online(card->read.ccwdev);
2117 if (rc)
2118 goto out_err;
2119 rc = ccw_device_set_online(card->write.ccwdev);
2120 if (rc)
2121 goto out_werr;
2122
2123 LCS_DBF_TEXT(3, setup, "lcsnewdv");
2124
2125 lcs_setup_card(card);
2126 rc = lcs_detect(card);
2127 if (rc) {
2128 LCS_DBF_TEXT(2, setup, "dtctfail");
2129 dev_err(&ccwgdev->dev,
2130 "Detecting a network adapter for LCS devices"
2131 " failed with rc=%d (0x%x)\n", rc, rc);
2132 lcs_stopcard(card);
2133 goto out;
2134 }
2135 if (card->dev) {
2136 LCS_DBF_TEXT(2, setup, "samedev");
2137 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2138 goto netdev_out;
2139 }
2140 switch (card->lan_type) {
2141 #ifdef CONFIG_ETHERNET
2142 case LCS_FRAME_TYPE_ENET:
2143 card->lan_type_trans = eth_type_trans;
2144 dev = alloc_etherdev(0);
2145 break;
2146 #endif
2147 #ifdef CONFIG_FDDI
2148 case LCS_FRAME_TYPE_FDDI:
2149 card->lan_type_trans = fddi_type_trans;
2150 dev = alloc_fddidev(0);
2151 break;
2152 #endif
2153 default:
2154 LCS_DBF_TEXT(3, setup, "errinit");
2155 pr_err(" Initialization failed\n");
2156 goto out;
2157 }
2158 if (!dev)
2159 goto out;
2160 card->dev = dev;
2161 card->dev->ml_priv = card;
2162 card->dev->netdev_ops = &lcs_netdev_ops;
2163 card->dev->dev_port = card->portno;
2164 memcpy(card->dev->dev_addr, card->mac, LCS_MAC_LENGTH);
2165 #ifdef CONFIG_IP_MULTICAST
2166 if (!lcs_check_multicast_support(card))
2167 card->dev->netdev_ops = &lcs_mc_netdev_ops;
2168 #endif
2169 netdev_out:
2170 lcs_set_allowed_threads(card,0xffffffff);
2171 if (recover_state == DEV_STATE_RECOVER) {
2172 lcs_set_multicast_list(card->dev);
2173 card->dev->flags |= IFF_UP;
2174 netif_carrier_on(card->dev);
2175 netif_wake_queue(card->dev);
2176 card->state = DEV_STATE_UP;
2177 } else {
2178 lcs_stopcard(card);
2179 }
2180
2181 if (lcs_register_netdev(ccwgdev) != 0)
2182 goto out;
2183
2184 /* Print out supported assists: IPv6 */
2185 pr_info("LCS device %s %s IPv6 support\n", card->dev->name,
2186 (card->ip_assists_supported & LCS_IPASS_IPV6_SUPPORT) ?
2187 "with" : "without");
2188 /* Print out supported assist: Multicast */
2189 pr_info("LCS device %s %s Multicast support\n", card->dev->name,
2190 (card->ip_assists_supported & LCS_IPASS_MULTICAST_SUPPORT) ?
2191 "with" : "without");
2192 return 0;
2193 out:
2194
2195 ccw_device_set_offline(card->write.ccwdev);
2196 out_werr:
2197 ccw_device_set_offline(card->read.ccwdev);
2198 out_err:
2199 return -ENODEV;
2200 }
2201
2202 /**
2203 * lcs_shutdown_device, called when setting the group device offline.
2204 */
2205 static int
2206 __lcs_shutdown_device(struct ccwgroup_device *ccwgdev, int recovery_mode)
2207 {
2208 struct lcs_card *card;
2209 enum lcs_dev_states recover_state;
2210 int ret = 0, ret2 = 0, ret3 = 0;
2211
2212 LCS_DBF_TEXT(3, setup, "shtdndev");
2213 card = dev_get_drvdata(&ccwgdev->dev);
2214 if (!card)
2215 return -ENODEV;
2216 if (recovery_mode == 0) {
2217 lcs_set_allowed_threads(card, 0);
2218 if (lcs_wait_for_threads(card, LCS_SET_MC_THREAD))
2219 return -ERESTARTSYS;
2220 }
2221 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2222 recover_state = card->state;
2223
2224 ret = lcs_stop_device(card->dev);
2225 ret2 = ccw_device_set_offline(card->read.ccwdev);
2226 ret3 = ccw_device_set_offline(card->write.ccwdev);
2227 if (!ret)
2228 ret = (ret2) ? ret2 : ret3;
2229 if (ret)
2230 LCS_DBF_TEXT_(3, setup, "1err:%d", ret);
2231 if (recover_state == DEV_STATE_UP) {
2232 card->state = DEV_STATE_RECOVER;
2233 }
2234 return 0;
2235 }
2236
2237 static int
2238 lcs_shutdown_device(struct ccwgroup_device *ccwgdev)
2239 {
2240 return __lcs_shutdown_device(ccwgdev, 0);
2241 }
2242
2243 /**
2244 * drive lcs recovery after startup and startlan initiated by Lan Gateway
2245 */
2246 static int
2247 lcs_recovery(void *ptr)
2248 {
2249 struct lcs_card *card;
2250 struct ccwgroup_device *gdev;
2251 int rc;
2252
2253 card = (struct lcs_card *) ptr;
2254
2255 LCS_DBF_TEXT(4, trace, "recover1");
2256 if (!lcs_do_run_thread(card, LCS_RECOVERY_THREAD))
2257 return 0;
2258 LCS_DBF_TEXT(4, trace, "recover2");
2259 gdev = card->gdev;
2260 dev_warn(&gdev->dev,
2261 "A recovery process has been started for the LCS device\n");
2262 rc = __lcs_shutdown_device(gdev, 1);
2263 rc = lcs_new_device(gdev);
2264 if (!rc)
2265 pr_info("Device %s successfully recovered!\n",
2266 card->dev->name);
2267 else
2268 pr_info("Device %s could not be recovered!\n",
2269 card->dev->name);
2270 lcs_clear_thread_running_bit(card, LCS_RECOVERY_THREAD);
2271 return 0;
2272 }
2273
2274 /**
2275 * lcs_remove_device, free buffers and card
2276 */
2277 static void
2278 lcs_remove_device(struct ccwgroup_device *ccwgdev)
2279 {
2280 struct lcs_card *card;
2281
2282 card = dev_get_drvdata(&ccwgdev->dev);
2283 if (!card)
2284 return;
2285
2286 LCS_DBF_TEXT(3, setup, "remdev");
2287 LCS_DBF_HEX(3, setup, &card, sizeof(void*));
2288 if (ccwgdev->state == CCWGROUP_ONLINE) {
2289 lcs_shutdown_device(ccwgdev);
2290 }
2291 if (card->dev)
2292 unregister_netdev(card->dev);
2293 lcs_cleanup_card(card);
2294 lcs_free_card(card);
2295 dev_set_drvdata(&ccwgdev->dev, NULL);
2296 put_device(&ccwgdev->dev);
2297 }
2298
2299 static int lcs_pm_suspend(struct lcs_card *card)
2300 {
2301 if (card->dev)
2302 netif_device_detach(card->dev);
2303 lcs_set_allowed_threads(card, 0);
2304 lcs_wait_for_threads(card, 0xffffffff);
2305 if (card->state != DEV_STATE_DOWN)
2306 __lcs_shutdown_device(card->gdev, 1);
2307 return 0;
2308 }
2309
2310 static int lcs_pm_resume(struct lcs_card *card)
2311 {
2312 int rc = 0;
2313
2314 if (card->state == DEV_STATE_RECOVER)
2315 rc = lcs_new_device(card->gdev);
2316 if (card->dev)
2317 netif_device_attach(card->dev);
2318 if (rc) {
2319 dev_warn(&card->gdev->dev, "The lcs device driver "
2320 "failed to recover the device\n");
2321 }
2322 return rc;
2323 }
2324
2325 static int lcs_prepare(struct ccwgroup_device *gdev)
2326 {
2327 return 0;
2328 }
2329
2330 static void lcs_complete(struct ccwgroup_device *gdev)
2331 {
2332 return;
2333 }
2334
2335 static int lcs_freeze(struct ccwgroup_device *gdev)
2336 {
2337 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2338 return lcs_pm_suspend(card);
2339 }
2340
2341 static int lcs_thaw(struct ccwgroup_device *gdev)
2342 {
2343 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2344 return lcs_pm_resume(card);
2345 }
2346
2347 static int lcs_restore(struct ccwgroup_device *gdev)
2348 {
2349 struct lcs_card *card = dev_get_drvdata(&gdev->dev);
2350 return lcs_pm_resume(card);
2351 }
2352
2353 static struct ccw_device_id lcs_ids[] = {
2354 {CCW_DEVICE(0x3088, 0x08), .driver_info = lcs_channel_type_parallel},
2355 {CCW_DEVICE(0x3088, 0x1f), .driver_info = lcs_channel_type_2216},
2356 {CCW_DEVICE(0x3088, 0x60), .driver_info = lcs_channel_type_osa2},
2357 {},
2358 };
2359 MODULE_DEVICE_TABLE(ccw, lcs_ids);
2360
2361 static struct ccw_driver lcs_ccw_driver = {
2362 .driver = {
2363 .owner = THIS_MODULE,
2364 .name = "lcs",
2365 },
2366 .ids = lcs_ids,
2367 .probe = ccwgroup_probe_ccwdev,
2368 .remove = ccwgroup_remove_ccwdev,
2369 .int_class = IRQIO_LCS,
2370 };
2371
2372 /**
2373 * LCS ccwgroup driver registration
2374 */
2375 static struct ccwgroup_driver lcs_group_driver = {
2376 .driver = {
2377 .owner = THIS_MODULE,
2378 .name = "lcs",
2379 },
2380 .ccw_driver = &lcs_ccw_driver,
2381 .setup = lcs_probe_device,
2382 .remove = lcs_remove_device,
2383 .set_online = lcs_new_device,
2384 .set_offline = lcs_shutdown_device,
2385 .prepare = lcs_prepare,
2386 .complete = lcs_complete,
2387 .freeze = lcs_freeze,
2388 .thaw = lcs_thaw,
2389 .restore = lcs_restore,
2390 };
2391
2392 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
2393 size_t count)
2394 {
2395 int err;
2396 err = ccwgroup_create_dev(lcs_root_dev, &lcs_group_driver, 2, buf);
2397 return err ? err : count;
2398 }
2399 static DRIVER_ATTR_WO(group);
2400
2401 static struct attribute *lcs_drv_attrs[] = {
2402 &driver_attr_group.attr,
2403 NULL,
2404 };
2405 static struct attribute_group lcs_drv_attr_group = {
2406 .attrs = lcs_drv_attrs,
2407 };
2408 static const struct attribute_group *lcs_drv_attr_groups[] = {
2409 &lcs_drv_attr_group,
2410 NULL,
2411 };
2412
2413 /**
2414 * LCS Module/Kernel initialization function
2415 */
2416 static int
2417 __init lcs_init_module(void)
2418 {
2419 int rc;
2420
2421 pr_info("Loading %s\n", version);
2422 rc = lcs_register_debug_facility();
2423 LCS_DBF_TEXT(0, setup, "lcsinit");
2424 if (rc)
2425 goto out_err;
2426 lcs_root_dev = root_device_register("lcs");
2427 rc = PTR_ERR_OR_ZERO(lcs_root_dev);
2428 if (rc)
2429 goto register_err;
2430 rc = ccw_driver_register(&lcs_ccw_driver);
2431 if (rc)
2432 goto ccw_err;
2433 lcs_group_driver.driver.groups = lcs_drv_attr_groups;
2434 rc = ccwgroup_driver_register(&lcs_group_driver);
2435 if (rc)
2436 goto ccwgroup_err;
2437 return 0;
2438
2439 ccwgroup_err:
2440 ccw_driver_unregister(&lcs_ccw_driver);
2441 ccw_err:
2442 root_device_unregister(lcs_root_dev);
2443 register_err:
2444 lcs_unregister_debug_facility();
2445 out_err:
2446 pr_err("Initializing the lcs device driver failed\n");
2447 return rc;
2448 }
2449
2450
2451 /**
2452 * LCS module cleanup function
2453 */
2454 static void
2455 __exit lcs_cleanup_module(void)
2456 {
2457 pr_info("Terminating lcs module.\n");
2458 LCS_DBF_TEXT(0, trace, "cleanup");
2459 ccwgroup_driver_unregister(&lcs_group_driver);
2460 ccw_driver_unregister(&lcs_ccw_driver);
2461 root_device_unregister(lcs_root_dev);
2462 lcs_unregister_debug_facility();
2463 }
2464
2465 module_init(lcs_init_module);
2466 module_exit(lcs_cleanup_module);
2467
2468 MODULE_AUTHOR("Frank Pavlic <fpavlic@de.ibm.com>");
2469 MODULE_LICENSE("GPL");
2470
Linux with added FPC-III support