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