diff options
author | David S. Miller <davem@davemloft.net> | 2008-03-22 21:22:42 -0400 |
---|---|---|
committer | David S. Miller <davem@davemloft.net> | 2008-03-22 21:22:42 -0400 |
commit | 76fef2b6bffa13ad7ccd54c0493b053295721b9a (patch) | |
tree | f4509477d413398b7155fb3c35453ab26bd81bce /drivers/s390/net/ctcmain.c | |
parent | 817bc4db7794d6dc6594265ddea88d2b839cf2f8 (diff) | |
parent | ef8500457b29eed13d03ff19af36d810308e57b7 (diff) |
Merge branch 'upstream-net26' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik/netdev-2.6
Conflicts:
drivers/s390/net/qeth_main.c
Diffstat (limited to 'drivers/s390/net/ctcmain.c')
-rw-r--r-- | drivers/s390/net/ctcmain.c | 3062 |
1 files changed, 0 insertions, 3062 deletions
diff --git a/drivers/s390/net/ctcmain.c b/drivers/s390/net/ctcmain.c deleted file mode 100644 index 77a503139e32..000000000000 --- a/drivers/s390/net/ctcmain.c +++ /dev/null | |||
@@ -1,3062 +0,0 @@ | |||
1 | /* | ||
2 | * CTC / ESCON network driver | ||
3 | * | ||
4 | * Copyright (C) 2001 IBM Deutschland Entwicklung GmbH, IBM Corporation | ||
5 | * Author(s): Fritz Elfert (elfert@de.ibm.com, felfert@millenux.com) | ||
6 | * Fixes by : Jochen Röhrig (roehrig@de.ibm.com) | ||
7 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> | ||
8 | Peter Tiedemann (ptiedem@de.ibm.com) | ||
9 | * Driver Model stuff by : Cornelia Huck <cornelia.huck@de.ibm.com> | ||
10 | * | ||
11 | * Documentation used: | ||
12 | * - Principles of Operation (IBM doc#: SA22-7201-06) | ||
13 | * - Common IO/-Device Commands and Self Description (IBM doc#: SA22-7204-02) | ||
14 | * - Common IO/-Device Commands and Self Description (IBM doc#: SN22-5535) | ||
15 | * - ESCON Channel-to-Channel Adapter (IBM doc#: SA22-7203-00) | ||
16 | * - ESCON I/O Interface (IBM doc#: SA22-7202-029 | ||
17 | * | ||
18 | * and the source of the original CTC driver by: | ||
19 | * Dieter Wellerdiek (wel@de.ibm.com) | ||
20 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | ||
21 | * Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com) | ||
22 | * Jochen Röhrig (roehrig@de.ibm.com) | ||
23 | * | ||
24 | * This program is free software; you can redistribute it and/or modify | ||
25 | * it under the terms of the GNU General Public License as published by | ||
26 | * the Free Software Foundation; either version 2, or (at your option) | ||
27 | * any later version. | ||
28 | * | ||
29 | * This program is distributed in the hope that it will be useful, | ||
30 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
31 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
32 | * GNU General Public License for more details. | ||
33 | * | ||
34 | * You should have received a copy of the GNU General Public License | ||
35 | * along with this program; if not, write to the Free Software | ||
36 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | ||
37 | * | ||
38 | */ | ||
39 | #undef DEBUG | ||
40 | #include <linux/module.h> | ||
41 | #include <linux/init.h> | ||
42 | #include <linux/kernel.h> | ||
43 | #include <linux/slab.h> | ||
44 | #include <linux/errno.h> | ||
45 | #include <linux/types.h> | ||
46 | #include <linux/interrupt.h> | ||
47 | #include <linux/timer.h> | ||
48 | #include <linux/bitops.h> | ||
49 | |||
50 | #include <linux/signal.h> | ||
51 | #include <linux/string.h> | ||
52 | |||
53 | #include <linux/ip.h> | ||
54 | #include <linux/if_arp.h> | ||
55 | #include <linux/tcp.h> | ||
56 | #include <linux/skbuff.h> | ||
57 | #include <linux/ctype.h> | ||
58 | #include <net/dst.h> | ||
59 | |||
60 | #include <asm/io.h> | ||
61 | #include <asm/ccwdev.h> | ||
62 | #include <asm/ccwgroup.h> | ||
63 | #include <asm/uaccess.h> | ||
64 | |||
65 | #include <asm/idals.h> | ||
66 | |||
67 | #include "fsm.h" | ||
68 | #include "cu3088.h" | ||
69 | |||
70 | #include "ctcdbug.h" | ||
71 | #include "ctcmain.h" | ||
72 | |||
73 | MODULE_AUTHOR("(C) 2000 IBM Corp. by Fritz Elfert (felfert@millenux.com)"); | ||
74 | MODULE_DESCRIPTION("Linux for S/390 CTC/Escon Driver"); | ||
75 | MODULE_LICENSE("GPL"); | ||
76 | /** | ||
77 | * States of the interface statemachine. | ||
78 | */ | ||
79 | enum dev_states { | ||
80 | DEV_STATE_STOPPED, | ||
81 | DEV_STATE_STARTWAIT_RXTX, | ||
82 | DEV_STATE_STARTWAIT_RX, | ||
83 | DEV_STATE_STARTWAIT_TX, | ||
84 | DEV_STATE_STOPWAIT_RXTX, | ||
85 | DEV_STATE_STOPWAIT_RX, | ||
86 | DEV_STATE_STOPWAIT_TX, | ||
87 | DEV_STATE_RUNNING, | ||
88 | /** | ||
89 | * MUST be always the last element!! | ||
90 | */ | ||
91 | CTC_NR_DEV_STATES | ||
92 | }; | ||
93 | |||
94 | static const char *dev_state_names[] = { | ||
95 | "Stopped", | ||
96 | "StartWait RXTX", | ||
97 | "StartWait RX", | ||
98 | "StartWait TX", | ||
99 | "StopWait RXTX", | ||
100 | "StopWait RX", | ||
101 | "StopWait TX", | ||
102 | "Running", | ||
103 | }; | ||
104 | |||
105 | /** | ||
106 | * Events of the interface statemachine. | ||
107 | */ | ||
108 | enum dev_events { | ||
109 | DEV_EVENT_START, | ||
110 | DEV_EVENT_STOP, | ||
111 | DEV_EVENT_RXUP, | ||
112 | DEV_EVENT_TXUP, | ||
113 | DEV_EVENT_RXDOWN, | ||
114 | DEV_EVENT_TXDOWN, | ||
115 | DEV_EVENT_RESTART, | ||
116 | /** | ||
117 | * MUST be always the last element!! | ||
118 | */ | ||
119 | CTC_NR_DEV_EVENTS | ||
120 | }; | ||
121 | |||
122 | static const char *dev_event_names[] = { | ||
123 | "Start", | ||
124 | "Stop", | ||
125 | "RX up", | ||
126 | "TX up", | ||
127 | "RX down", | ||
128 | "TX down", | ||
129 | "Restart", | ||
130 | }; | ||
131 | |||
132 | /** | ||
133 | * Events of the channel statemachine | ||
134 | */ | ||
135 | enum ch_events { | ||
136 | /** | ||
137 | * Events, representing return code of | ||
138 | * I/O operations (ccw_device_start, ccw_device_halt et al.) | ||
139 | */ | ||
140 | CH_EVENT_IO_SUCCESS, | ||
141 | CH_EVENT_IO_EBUSY, | ||
142 | CH_EVENT_IO_ENODEV, | ||
143 | CH_EVENT_IO_EIO, | ||
144 | CH_EVENT_IO_UNKNOWN, | ||
145 | |||
146 | CH_EVENT_ATTNBUSY, | ||
147 | CH_EVENT_ATTN, | ||
148 | CH_EVENT_BUSY, | ||
149 | |||
150 | /** | ||
151 | * Events, representing unit-check | ||
152 | */ | ||
153 | CH_EVENT_UC_RCRESET, | ||
154 | CH_EVENT_UC_RSRESET, | ||
155 | CH_EVENT_UC_TXTIMEOUT, | ||
156 | CH_EVENT_UC_TXPARITY, | ||
157 | CH_EVENT_UC_HWFAIL, | ||
158 | CH_EVENT_UC_RXPARITY, | ||
159 | CH_EVENT_UC_ZERO, | ||
160 | CH_EVENT_UC_UNKNOWN, | ||
161 | |||
162 | /** | ||
163 | * Events, representing subchannel-check | ||
164 | */ | ||
165 | CH_EVENT_SC_UNKNOWN, | ||
166 | |||
167 | /** | ||
168 | * Events, representing machine checks | ||
169 | */ | ||
170 | CH_EVENT_MC_FAIL, | ||
171 | CH_EVENT_MC_GOOD, | ||
172 | |||
173 | /** | ||
174 | * Event, representing normal IRQ | ||
175 | */ | ||
176 | CH_EVENT_IRQ, | ||
177 | CH_EVENT_FINSTAT, | ||
178 | |||
179 | /** | ||
180 | * Event, representing timer expiry. | ||
181 | */ | ||
182 | CH_EVENT_TIMER, | ||
183 | |||
184 | /** | ||
185 | * Events, representing commands from upper levels. | ||
186 | */ | ||
187 | CH_EVENT_START, | ||
188 | CH_EVENT_STOP, | ||
189 | |||
190 | /** | ||
191 | * MUST be always the last element!! | ||
192 | */ | ||
193 | NR_CH_EVENTS, | ||
194 | }; | ||
195 | |||
196 | /** | ||
197 | * States of the channel statemachine. | ||
198 | */ | ||
199 | enum ch_states { | ||
200 | /** | ||
201 | * Channel not assigned to any device, | ||
202 | * initial state, direction invalid | ||
203 | */ | ||
204 | CH_STATE_IDLE, | ||
205 | |||
206 | /** | ||
207 | * Channel assigned but not operating | ||
208 | */ | ||
209 | CH_STATE_STOPPED, | ||
210 | CH_STATE_STARTWAIT, | ||
211 | CH_STATE_STARTRETRY, | ||
212 | CH_STATE_SETUPWAIT, | ||
213 | CH_STATE_RXINIT, | ||
214 | CH_STATE_TXINIT, | ||
215 | CH_STATE_RX, | ||
216 | CH_STATE_TX, | ||
217 | CH_STATE_RXIDLE, | ||
218 | CH_STATE_TXIDLE, | ||
219 | CH_STATE_RXERR, | ||
220 | CH_STATE_TXERR, | ||
221 | CH_STATE_TERM, | ||
222 | CH_STATE_DTERM, | ||
223 | CH_STATE_NOTOP, | ||
224 | |||
225 | /** | ||
226 | * MUST be always the last element!! | ||
227 | */ | ||
228 | NR_CH_STATES, | ||
229 | }; | ||
230 | |||
231 | static int loglevel = CTC_LOGLEVEL_DEFAULT; | ||
232 | |||
233 | /** | ||
234 | * Linked list of all detected channels. | ||
235 | */ | ||
236 | static struct channel *channels = NULL; | ||
237 | |||
238 | /** | ||
239 | * Print Banner. | ||
240 | */ | ||
241 | static void | ||
242 | print_banner(void) | ||
243 | { | ||
244 | static int printed = 0; | ||
245 | |||
246 | if (printed) | ||
247 | return; | ||
248 | |||
249 | printk(KERN_INFO "CTC driver initialized\n"); | ||
250 | printed = 1; | ||
251 | } | ||
252 | |||
253 | /** | ||
254 | * Return type of a detected device. | ||
255 | */ | ||
256 | static enum channel_types | ||
257 | get_channel_type(struct ccw_device_id *id) | ||
258 | { | ||
259 | enum channel_types type = (enum channel_types) id->driver_info; | ||
260 | |||
261 | if (type == channel_type_ficon) | ||
262 | type = channel_type_escon; | ||
263 | |||
264 | return type; | ||
265 | } | ||
266 | |||
267 | static const char *ch_event_names[] = { | ||
268 | "ccw_device success", | ||
269 | "ccw_device busy", | ||
270 | "ccw_device enodev", | ||
271 | "ccw_device ioerr", | ||
272 | "ccw_device unknown", | ||
273 | |||
274 | "Status ATTN & BUSY", | ||
275 | "Status ATTN", | ||
276 | "Status BUSY", | ||
277 | |||
278 | "Unit check remote reset", | ||
279 | "Unit check remote system reset", | ||
280 | "Unit check TX timeout", | ||
281 | "Unit check TX parity", | ||
282 | "Unit check Hardware failure", | ||
283 | "Unit check RX parity", | ||
284 | "Unit check ZERO", | ||
285 | "Unit check Unknown", | ||
286 | |||
287 | "SubChannel check Unknown", | ||
288 | |||
289 | "Machine check failure", | ||
290 | "Machine check operational", | ||
291 | |||
292 | "IRQ normal", | ||
293 | "IRQ final", | ||
294 | |||
295 | "Timer", | ||
296 | |||
297 | "Start", | ||
298 | "Stop", | ||
299 | }; | ||
300 | |||
301 | static const char *ch_state_names[] = { | ||
302 | "Idle", | ||
303 | "Stopped", | ||
304 | "StartWait", | ||
305 | "StartRetry", | ||
306 | "SetupWait", | ||
307 | "RX init", | ||
308 | "TX init", | ||
309 | "RX", | ||
310 | "TX", | ||
311 | "RX idle", | ||
312 | "TX idle", | ||
313 | "RX error", | ||
314 | "TX error", | ||
315 | "Terminating", | ||
316 | "Restarting", | ||
317 | "Not operational", | ||
318 | }; | ||
319 | |||
320 | #ifdef DEBUG | ||
321 | /** | ||
322 | * Dump header and first 16 bytes of an sk_buff for debugging purposes. | ||
323 | * | ||
324 | * @param skb The sk_buff to dump. | ||
325 | * @param offset Offset relative to skb-data, where to start the dump. | ||
326 | */ | ||
327 | static void | ||
328 | ctc_dump_skb(struct sk_buff *skb, int offset) | ||
329 | { | ||
330 | unsigned char *p = skb->data; | ||
331 | __u16 bl; | ||
332 | struct ll_header *header; | ||
333 | int i; | ||
334 | |||
335 | if (!(loglevel & CTC_LOGLEVEL_DEBUG)) | ||
336 | return; | ||
337 | p += offset; | ||
338 | bl = *((__u16 *) p); | ||
339 | p += 2; | ||
340 | header = (struct ll_header *) p; | ||
341 | p -= 2; | ||
342 | |||
343 | printk(KERN_DEBUG "dump:\n"); | ||
344 | printk(KERN_DEBUG "blocklen=%d %04x\n", bl, bl); | ||
345 | |||
346 | printk(KERN_DEBUG "h->length=%d %04x\n", header->length, | ||
347 | header->length); | ||
348 | printk(KERN_DEBUG "h->type=%04x\n", header->type); | ||
349 | printk(KERN_DEBUG "h->unused=%04x\n", header->unused); | ||
350 | if (bl > 16) | ||
351 | bl = 16; | ||
352 | printk(KERN_DEBUG "data: "); | ||
353 | for (i = 0; i < bl; i++) | ||
354 | printk("%02x%s", *p++, (i % 16) ? " " : "\n<7>"); | ||
355 | printk("\n"); | ||
356 | } | ||
357 | #else | ||
358 | static inline void | ||
359 | ctc_dump_skb(struct sk_buff *skb, int offset) | ||
360 | { | ||
361 | } | ||
362 | #endif | ||
363 | |||
364 | /** | ||
365 | * Unpack a just received skb and hand it over to | ||
366 | * upper layers. | ||
367 | * | ||
368 | * @param ch The channel where this skb has been received. | ||
369 | * @param pskb The received skb. | ||
370 | */ | ||
371 | static void | ||
372 | ctc_unpack_skb(struct channel *ch, struct sk_buff *pskb) | ||
373 | { | ||
374 | struct net_device *dev = ch->netdev; | ||
375 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; | ||
376 | __u16 len = *((__u16 *) pskb->data); | ||
377 | |||
378 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
379 | skb_put(pskb, 2 + LL_HEADER_LENGTH); | ||
380 | skb_pull(pskb, 2); | ||
381 | pskb->dev = dev; | ||
382 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | ||
383 | while (len > 0) { | ||
384 | struct sk_buff *skb; | ||
385 | struct ll_header *header = (struct ll_header *) pskb->data; | ||
386 | |||
387 | skb_pull(pskb, LL_HEADER_LENGTH); | ||
388 | if ((ch->protocol == CTC_PROTO_S390) && | ||
389 | (header->type != ETH_P_IP)) { | ||
390 | |||
391 | #ifndef DEBUG | ||
392 | if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { | ||
393 | #endif | ||
394 | /** | ||
395 | * Check packet type only if we stick strictly | ||
396 | * to S/390's protocol of OS390. This only | ||
397 | * supports IP. Otherwise allow any packet | ||
398 | * type. | ||
399 | */ | ||
400 | ctc_pr_warn( | ||
401 | "%s Illegal packet type 0x%04x received, dropping\n", | ||
402 | dev->name, header->type); | ||
403 | ch->logflags |= LOG_FLAG_ILLEGALPKT; | ||
404 | #ifndef DEBUG | ||
405 | } | ||
406 | #endif | ||
407 | #ifdef DEBUG | ||
408 | ctc_dump_skb(pskb, -6); | ||
409 | #endif | ||
410 | privptr->stats.rx_dropped++; | ||
411 | privptr->stats.rx_frame_errors++; | ||
412 | return; | ||
413 | } | ||
414 | pskb->protocol = ntohs(header->type); | ||
415 | if (header->length <= LL_HEADER_LENGTH) { | ||
416 | #ifndef DEBUG | ||
417 | if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { | ||
418 | #endif | ||
419 | ctc_pr_warn( | ||
420 | "%s Illegal packet size %d " | ||
421 | "received (MTU=%d blocklen=%d), " | ||
422 | "dropping\n", dev->name, header->length, | ||
423 | dev->mtu, len); | ||
424 | ch->logflags |= LOG_FLAG_ILLEGALSIZE; | ||
425 | #ifndef DEBUG | ||
426 | } | ||
427 | #endif | ||
428 | #ifdef DEBUG | ||
429 | ctc_dump_skb(pskb, -6); | ||
430 | #endif | ||
431 | privptr->stats.rx_dropped++; | ||
432 | privptr->stats.rx_length_errors++; | ||
433 | return; | ||
434 | } | ||
435 | header->length -= LL_HEADER_LENGTH; | ||
436 | len -= LL_HEADER_LENGTH; | ||
437 | if ((header->length > skb_tailroom(pskb)) || | ||
438 | (header->length > len)) { | ||
439 | #ifndef DEBUG | ||
440 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { | ||
441 | #endif | ||
442 | ctc_pr_warn( | ||
443 | "%s Illegal packet size %d " | ||
444 | "(beyond the end of received data), " | ||
445 | "dropping\n", dev->name, header->length); | ||
446 | ch->logflags |= LOG_FLAG_OVERRUN; | ||
447 | #ifndef DEBUG | ||
448 | } | ||
449 | #endif | ||
450 | #ifdef DEBUG | ||
451 | ctc_dump_skb(pskb, -6); | ||
452 | #endif | ||
453 | privptr->stats.rx_dropped++; | ||
454 | privptr->stats.rx_length_errors++; | ||
455 | return; | ||
456 | } | ||
457 | skb_put(pskb, header->length); | ||
458 | skb_reset_mac_header(pskb); | ||
459 | len -= header->length; | ||
460 | skb = dev_alloc_skb(pskb->len); | ||
461 | if (!skb) { | ||
462 | #ifndef DEBUG | ||
463 | if (!(ch->logflags & LOG_FLAG_NOMEM)) { | ||
464 | #endif | ||
465 | ctc_pr_warn( | ||
466 | "%s Out of memory in ctc_unpack_skb\n", | ||
467 | dev->name); | ||
468 | ch->logflags |= LOG_FLAG_NOMEM; | ||
469 | #ifndef DEBUG | ||
470 | } | ||
471 | #endif | ||
472 | privptr->stats.rx_dropped++; | ||
473 | return; | ||
474 | } | ||
475 | skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), | ||
476 | pskb->len); | ||
477 | skb_reset_mac_header(skb); | ||
478 | skb->dev = pskb->dev; | ||
479 | skb->protocol = pskb->protocol; | ||
480 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | ||
481 | /** | ||
482 | * reset logflags | ||
483 | */ | ||
484 | ch->logflags = 0; | ||
485 | privptr->stats.rx_packets++; | ||
486 | privptr->stats.rx_bytes += skb->len; | ||
487 | netif_rx_ni(skb); | ||
488 | dev->last_rx = jiffies; | ||
489 | if (len > 0) { | ||
490 | skb_pull(pskb, header->length); | ||
491 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { | ||
492 | #ifndef DEBUG | ||
493 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { | ||
494 | #endif | ||
495 | ctc_pr_warn( | ||
496 | "%s Overrun in ctc_unpack_skb\n", | ||
497 | dev->name); | ||
498 | ch->logflags |= LOG_FLAG_OVERRUN; | ||
499 | #ifndef DEBUG | ||
500 | } | ||
501 | #endif | ||
502 | return; | ||
503 | } | ||
504 | skb_put(pskb, LL_HEADER_LENGTH); | ||
505 | } | ||
506 | } | ||
507 | } | ||
508 | |||
509 | /** | ||
510 | * Check return code of a preceeding ccw_device call, halt_IO etc... | ||
511 | * | ||
512 | * @param ch The channel, the error belongs to. | ||
513 | * @param return_code The error code to inspect. | ||
514 | */ | ||
515 | static void | ||
516 | ccw_check_return_code(struct channel *ch, int return_code, char *msg) | ||
517 | { | ||
518 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
519 | switch (return_code) { | ||
520 | case 0: | ||
521 | fsm_event(ch->fsm, CH_EVENT_IO_SUCCESS, ch); | ||
522 | break; | ||
523 | case -EBUSY: | ||
524 | ctc_pr_warn("%s (%s): Busy !\n", ch->id, msg); | ||
525 | fsm_event(ch->fsm, CH_EVENT_IO_EBUSY, ch); | ||
526 | break; | ||
527 | case -ENODEV: | ||
528 | ctc_pr_emerg("%s (%s): Invalid device called for IO\n", | ||
529 | ch->id, msg); | ||
530 | fsm_event(ch->fsm, CH_EVENT_IO_ENODEV, ch); | ||
531 | break; | ||
532 | case -EIO: | ||
533 | ctc_pr_emerg("%s (%s): Status pending... \n", | ||
534 | ch->id, msg); | ||
535 | fsm_event(ch->fsm, CH_EVENT_IO_EIO, ch); | ||
536 | break; | ||
537 | default: | ||
538 | ctc_pr_emerg("%s (%s): Unknown error in do_IO %04x\n", | ||
539 | ch->id, msg, return_code); | ||
540 | fsm_event(ch->fsm, CH_EVENT_IO_UNKNOWN, ch); | ||
541 | } | ||
542 | } | ||
543 | |||
544 | /** | ||
545 | * Check sense of a unit check. | ||
546 | * | ||
547 | * @param ch The channel, the sense code belongs to. | ||
548 | * @param sense The sense code to inspect. | ||
549 | */ | ||
550 | static void | ||
551 | ccw_unit_check(struct channel *ch, unsigned char sense) | ||
552 | { | ||
553 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
554 | if (sense & SNS0_INTERVENTION_REQ) { | ||
555 | if (sense & 0x01) { | ||
556 | ctc_pr_debug("%s: Interface disc. or Sel. reset " | ||
557 | "(remote)\n", ch->id); | ||
558 | fsm_event(ch->fsm, CH_EVENT_UC_RCRESET, ch); | ||
559 | } else { | ||
560 | ctc_pr_debug("%s: System reset (remote)\n", ch->id); | ||
561 | fsm_event(ch->fsm, CH_EVENT_UC_RSRESET, ch); | ||
562 | } | ||
563 | } else if (sense & SNS0_EQUIPMENT_CHECK) { | ||
564 | if (sense & SNS0_BUS_OUT_CHECK) { | ||
565 | ctc_pr_warn("%s: Hardware malfunction (remote)\n", | ||
566 | ch->id); | ||
567 | fsm_event(ch->fsm, CH_EVENT_UC_HWFAIL, ch); | ||
568 | } else { | ||
569 | ctc_pr_warn("%s: Read-data parity error (remote)\n", | ||
570 | ch->id); | ||
571 | fsm_event(ch->fsm, CH_EVENT_UC_RXPARITY, ch); | ||
572 | } | ||
573 | } else if (sense & SNS0_BUS_OUT_CHECK) { | ||
574 | if (sense & 0x04) { | ||
575 | ctc_pr_warn("%s: Data-streaming timeout)\n", ch->id); | ||
576 | fsm_event(ch->fsm, CH_EVENT_UC_TXTIMEOUT, ch); | ||
577 | } else { | ||
578 | ctc_pr_warn("%s: Data-transfer parity error\n", ch->id); | ||
579 | fsm_event(ch->fsm, CH_EVENT_UC_TXPARITY, ch); | ||
580 | } | ||
581 | } else if (sense & SNS0_CMD_REJECT) { | ||
582 | ctc_pr_warn("%s: Command reject\n", ch->id); | ||
583 | } else if (sense == 0) { | ||
584 | ctc_pr_debug("%s: Unit check ZERO\n", ch->id); | ||
585 | fsm_event(ch->fsm, CH_EVENT_UC_ZERO, ch); | ||
586 | } else { | ||
587 | ctc_pr_warn("%s: Unit Check with sense code: %02x\n", | ||
588 | ch->id, sense); | ||
589 | fsm_event(ch->fsm, CH_EVENT_UC_UNKNOWN, ch); | ||
590 | } | ||
591 | } | ||
592 | |||
593 | static void | ||
594 | ctc_purge_skb_queue(struct sk_buff_head *q) | ||
595 | { | ||
596 | struct sk_buff *skb; | ||
597 | |||
598 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
599 | |||
600 | while ((skb = skb_dequeue(q))) { | ||
601 | atomic_dec(&skb->users); | ||
602 | dev_kfree_skb_irq(skb); | ||
603 | } | ||
604 | } | ||
605 | |||
606 | static int | ||
607 | ctc_checkalloc_buffer(struct channel *ch, int warn) | ||
608 | { | ||
609 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
610 | if ((ch->trans_skb == NULL) || | ||
611 | (ch->flags & CHANNEL_FLAGS_BUFSIZE_CHANGED)) { | ||
612 | if (ch->trans_skb != NULL) | ||
613 | dev_kfree_skb(ch->trans_skb); | ||
614 | clear_normalized_cda(&ch->ccw[1]); | ||
615 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, | ||
616 | GFP_ATOMIC | GFP_DMA); | ||
617 | if (ch->trans_skb == NULL) { | ||
618 | if (warn) | ||
619 | ctc_pr_warn( | ||
620 | "%s: Couldn't alloc %s trans_skb\n", | ||
621 | ch->id, | ||
622 | (CHANNEL_DIRECTION(ch->flags) == READ) ? | ||
623 | "RX" : "TX"); | ||
624 | return -ENOMEM; | ||
625 | } | ||
626 | ch->ccw[1].count = ch->max_bufsize; | ||
627 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { | ||
628 | dev_kfree_skb(ch->trans_skb); | ||
629 | ch->trans_skb = NULL; | ||
630 | if (warn) | ||
631 | ctc_pr_warn( | ||
632 | "%s: set_normalized_cda for %s " | ||
633 | "trans_skb failed, dropping packets\n", | ||
634 | ch->id, | ||
635 | (CHANNEL_DIRECTION(ch->flags) == READ) ? | ||
636 | "RX" : "TX"); | ||
637 | return -ENOMEM; | ||
638 | } | ||
639 | ch->ccw[1].count = 0; | ||
640 | ch->trans_skb_data = ch->trans_skb->data; | ||
641 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; | ||
642 | } | ||
643 | return 0; | ||
644 | } | ||
645 | |||
646 | /** | ||
647 | * Dummy NOP action for statemachines | ||
648 | */ | ||
649 | static void | ||
650 | fsm_action_nop(fsm_instance * fi, int event, void *arg) | ||
651 | { | ||
652 | } | ||
653 | |||
654 | /** | ||
655 | * Actions for channel - statemachines. | ||
656 | *****************************************************************************/ | ||
657 | |||
658 | /** | ||
659 | * Normal data has been send. Free the corresponding | ||
660 | * skb (it's in io_queue), reset dev->tbusy and | ||
661 | * revert to idle state. | ||
662 | * | ||
663 | * @param fi An instance of a channel statemachine. | ||
664 | * @param event The event, just happened. | ||
665 | * @param arg Generic pointer, casted from channel * upon call. | ||
666 | */ | ||
667 | static void | ||
668 | ch_action_txdone(fsm_instance * fi, int event, void *arg) | ||
669 | { | ||
670 | struct channel *ch = (struct channel *) arg; | ||
671 | struct net_device *dev = ch->netdev; | ||
672 | struct ctc_priv *privptr = dev->priv; | ||
673 | struct sk_buff *skb; | ||
674 | int first = 1; | ||
675 | int i; | ||
676 | unsigned long duration; | ||
677 | struct timespec done_stamp = current_kernel_time(); | ||
678 | |||
679 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
680 | |||
681 | duration = | ||
682 | (done_stamp.tv_sec - ch->prof.send_stamp.tv_sec) * 1000000 + | ||
683 | (done_stamp.tv_nsec - ch->prof.send_stamp.tv_nsec) / 1000; | ||
684 | if (duration > ch->prof.tx_time) | ||
685 | ch->prof.tx_time = duration; | ||
686 | |||
687 | if (ch->irb->scsw.count != 0) | ||
688 | ctc_pr_debug("%s: TX not complete, remaining %d bytes\n", | ||
689 | dev->name, ch->irb->scsw.count); | ||
690 | fsm_deltimer(&ch->timer); | ||
691 | while ((skb = skb_dequeue(&ch->io_queue))) { | ||
692 | privptr->stats.tx_packets++; | ||
693 | privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | ||
694 | if (first) { | ||
695 | privptr->stats.tx_bytes += 2; | ||
696 | first = 0; | ||
697 | } | ||
698 | atomic_dec(&skb->users); | ||
699 | dev_kfree_skb_irq(skb); | ||
700 | } | ||
701 | spin_lock(&ch->collect_lock); | ||
702 | clear_normalized_cda(&ch->ccw[4]); | ||
703 | if (ch->collect_len > 0) { | ||
704 | int rc; | ||
705 | |||
706 | if (ctc_checkalloc_buffer(ch, 1)) { | ||
707 | spin_unlock(&ch->collect_lock); | ||
708 | return; | ||
709 | } | ||
710 | ch->trans_skb->data = ch->trans_skb_data; | ||
711 | skb_reset_tail_pointer(ch->trans_skb); | ||
712 | ch->trans_skb->len = 0; | ||
713 | if (ch->prof.maxmulti < (ch->collect_len + 2)) | ||
714 | ch->prof.maxmulti = ch->collect_len + 2; | ||
715 | if (ch->prof.maxcqueue < skb_queue_len(&ch->collect_queue)) | ||
716 | ch->prof.maxcqueue = skb_queue_len(&ch->collect_queue); | ||
717 | *((__u16 *) skb_put(ch->trans_skb, 2)) = ch->collect_len + 2; | ||
718 | i = 0; | ||
719 | while ((skb = skb_dequeue(&ch->collect_queue))) { | ||
720 | skb_copy_from_linear_data(skb, skb_put(ch->trans_skb, | ||
721 | skb->len), | ||
722 | skb->len); | ||
723 | privptr->stats.tx_packets++; | ||
724 | privptr->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | ||
725 | atomic_dec(&skb->users); | ||
726 | dev_kfree_skb_irq(skb); | ||
727 | i++; | ||
728 | } | ||
729 | ch->collect_len = 0; | ||
730 | spin_unlock(&ch->collect_lock); | ||
731 | ch->ccw[1].count = ch->trans_skb->len; | ||
732 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
733 | ch->prof.send_stamp = current_kernel_time(); | ||
734 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], | ||
735 | (unsigned long) ch, 0xff, 0); | ||
736 | ch->prof.doios_multi++; | ||
737 | if (rc != 0) { | ||
738 | privptr->stats.tx_dropped += i; | ||
739 | privptr->stats.tx_errors += i; | ||
740 | fsm_deltimer(&ch->timer); | ||
741 | ccw_check_return_code(ch, rc, "chained TX"); | ||
742 | } | ||
743 | } else { | ||
744 | spin_unlock(&ch->collect_lock); | ||
745 | fsm_newstate(fi, CH_STATE_TXIDLE); | ||
746 | } | ||
747 | ctc_clear_busy(dev); | ||
748 | } | ||
749 | |||
750 | /** | ||
751 | * Initial data is sent. | ||
752 | * Notify device statemachine that we are up and | ||
753 | * running. | ||
754 | * | ||
755 | * @param fi An instance of a channel statemachine. | ||
756 | * @param event The event, just happened. | ||
757 | * @param arg Generic pointer, casted from channel * upon call. | ||
758 | */ | ||
759 | static void | ||
760 | ch_action_txidle(fsm_instance * fi, int event, void *arg) | ||
761 | { | ||
762 | struct channel *ch = (struct channel *) arg; | ||
763 | |||
764 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
765 | fsm_deltimer(&ch->timer); | ||
766 | fsm_newstate(fi, CH_STATE_TXIDLE); | ||
767 | fsm_event(((struct ctc_priv *) ch->netdev->priv)->fsm, DEV_EVENT_TXUP, | ||
768 | ch->netdev); | ||
769 | } | ||
770 | |||
771 | /** | ||
772 | * Got normal data, check for sanity, queue it up, allocate new buffer | ||
773 | * trigger bottom half, and initiate next read. | ||
774 | * | ||
775 | * @param fi An instance of a channel statemachine. | ||
776 | * @param event The event, just happened. | ||
777 | * @param arg Generic pointer, casted from channel * upon call. | ||
778 | */ | ||
779 | static void | ||
780 | ch_action_rx(fsm_instance * fi, int event, void *arg) | ||
781 | { | ||
782 | struct channel *ch = (struct channel *) arg; | ||
783 | struct net_device *dev = ch->netdev; | ||
784 | struct ctc_priv *privptr = dev->priv; | ||
785 | int len = ch->max_bufsize - ch->irb->scsw.count; | ||
786 | struct sk_buff *skb = ch->trans_skb; | ||
787 | __u16 block_len = *((__u16 *) skb->data); | ||
788 | int check_len; | ||
789 | int rc; | ||
790 | |||
791 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
792 | fsm_deltimer(&ch->timer); | ||
793 | if (len < 8) { | ||
794 | ctc_pr_debug("%s: got packet with length %d < 8\n", | ||
795 | dev->name, len); | ||
796 | privptr->stats.rx_dropped++; | ||
797 | privptr->stats.rx_length_errors++; | ||
798 | goto again; | ||
799 | } | ||
800 | if (len > ch->max_bufsize) { | ||
801 | ctc_pr_debug("%s: got packet with length %d > %d\n", | ||
802 | dev->name, len, ch->max_bufsize); | ||
803 | privptr->stats.rx_dropped++; | ||
804 | privptr->stats.rx_length_errors++; | ||
805 | goto again; | ||
806 | } | ||
807 | |||
808 | /** | ||
809 | * VM TCP seems to have a bug sending 2 trailing bytes of garbage. | ||
810 | */ | ||
811 | switch (ch->protocol) { | ||
812 | case CTC_PROTO_S390: | ||
813 | case CTC_PROTO_OS390: | ||
814 | check_len = block_len + 2; | ||
815 | break; | ||
816 | default: | ||
817 | check_len = block_len; | ||
818 | break; | ||
819 | } | ||
820 | if ((len < block_len) || (len > check_len)) { | ||
821 | ctc_pr_debug("%s: got block length %d != rx length %d\n", | ||
822 | dev->name, block_len, len); | ||
823 | #ifdef DEBUG | ||
824 | ctc_dump_skb(skb, 0); | ||
825 | #endif | ||
826 | *((__u16 *) skb->data) = len; | ||
827 | privptr->stats.rx_dropped++; | ||
828 | privptr->stats.rx_length_errors++; | ||
829 | goto again; | ||
830 | } | ||
831 | block_len -= 2; | ||
832 | if (block_len > 0) { | ||
833 | *((__u16 *) skb->data) = block_len; | ||
834 | ctc_unpack_skb(ch, skb); | ||
835 | } | ||
836 | again: | ||
837 | skb->data = ch->trans_skb_data; | ||
838 | skb_reset_tail_pointer(skb); | ||
839 | skb->len = 0; | ||
840 | if (ctc_checkalloc_buffer(ch, 1)) | ||
841 | return; | ||
842 | ch->ccw[1].count = ch->max_bufsize; | ||
843 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); | ||
844 | if (rc != 0) | ||
845 | ccw_check_return_code(ch, rc, "normal RX"); | ||
846 | } | ||
847 | |||
848 | static void ch_action_rxidle(fsm_instance * fi, int event, void *arg); | ||
849 | |||
850 | /** | ||
851 | * Initialize connection by sending a __u16 of value 0. | ||
852 | * | ||
853 | * @param fi An instance of a channel statemachine. | ||
854 | * @param event The event, just happened. | ||
855 | * @param arg Generic pointer, casted from channel * upon call. | ||
856 | */ | ||
857 | static void | ||
858 | ch_action_firstio(fsm_instance * fi, int event, void *arg) | ||
859 | { | ||
860 | struct channel *ch = (struct channel *) arg; | ||
861 | int rc; | ||
862 | |||
863 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
864 | |||
865 | if (fsm_getstate(fi) == CH_STATE_TXIDLE) | ||
866 | ctc_pr_debug("%s: remote side issued READ?, init ...\n", ch->id); | ||
867 | fsm_deltimer(&ch->timer); | ||
868 | if (ctc_checkalloc_buffer(ch, 1)) | ||
869 | return; | ||
870 | if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && | ||
871 | (ch->protocol == CTC_PROTO_OS390)) { | ||
872 | /* OS/390 resp. z/OS */ | ||
873 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
874 | *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; | ||
875 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, | ||
876 | CH_EVENT_TIMER, ch); | ||
877 | ch_action_rxidle(fi, event, arg); | ||
878 | } else { | ||
879 | struct net_device *dev = ch->netdev; | ||
880 | fsm_newstate(fi, CH_STATE_TXIDLE); | ||
881 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
882 | DEV_EVENT_TXUP, dev); | ||
883 | } | ||
884 | return; | ||
885 | } | ||
886 | |||
887 | /** | ||
888 | * Don't setup a timer for receiving the initial RX frame | ||
889 | * if in compatibility mode, since VM TCP delays the initial | ||
890 | * frame until it has some data to send. | ||
891 | */ | ||
892 | if ((CHANNEL_DIRECTION(ch->flags) == WRITE) || | ||
893 | (ch->protocol != CTC_PROTO_S390)) | ||
894 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
895 | |||
896 | *((__u16 *) ch->trans_skb->data) = CTC_INITIAL_BLOCKLEN; | ||
897 | ch->ccw[1].count = 2; /* Transfer only length */ | ||
898 | |||
899 | fsm_newstate(fi, (CHANNEL_DIRECTION(ch->flags) == READ) | ||
900 | ? CH_STATE_RXINIT : CH_STATE_TXINIT); | ||
901 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], (unsigned long) ch, 0xff, 0); | ||
902 | if (rc != 0) { | ||
903 | fsm_deltimer(&ch->timer); | ||
904 | fsm_newstate(fi, CH_STATE_SETUPWAIT); | ||
905 | ccw_check_return_code(ch, rc, "init IO"); | ||
906 | } | ||
907 | /** | ||
908 | * If in compatibility mode since we don't setup a timer, we | ||
909 | * also signal RX channel up immediately. This enables us | ||
910 | * to send packets early which in turn usually triggers some | ||
911 | * reply from VM TCP which brings up the RX channel to it's | ||
912 | * final state. | ||
913 | */ | ||
914 | if ((CHANNEL_DIRECTION(ch->flags) == READ) && | ||
915 | (ch->protocol == CTC_PROTO_S390)) { | ||
916 | struct net_device *dev = ch->netdev; | ||
917 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXUP, | ||
918 | dev); | ||
919 | } | ||
920 | } | ||
921 | |||
922 | /** | ||
923 | * Got initial data, check it. If OK, | ||
924 | * notify device statemachine that we are up and | ||
925 | * running. | ||
926 | * | ||
927 | * @param fi An instance of a channel statemachine. | ||
928 | * @param event The event, just happened. | ||
929 | * @param arg Generic pointer, casted from channel * upon call. | ||
930 | */ | ||
931 | static void | ||
932 | ch_action_rxidle(fsm_instance * fi, int event, void *arg) | ||
933 | { | ||
934 | struct channel *ch = (struct channel *) arg; | ||
935 | struct net_device *dev = ch->netdev; | ||
936 | __u16 buflen; | ||
937 | int rc; | ||
938 | |||
939 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
940 | fsm_deltimer(&ch->timer); | ||
941 | buflen = *((__u16 *) ch->trans_skb->data); | ||
942 | #ifdef DEBUG | ||
943 | ctc_pr_debug("%s: Initial RX count %d\n", dev->name, buflen); | ||
944 | #endif | ||
945 | if (buflen >= CTC_INITIAL_BLOCKLEN) { | ||
946 | if (ctc_checkalloc_buffer(ch, 1)) | ||
947 | return; | ||
948 | ch->ccw[1].count = ch->max_bufsize; | ||
949 | fsm_newstate(fi, CH_STATE_RXIDLE); | ||
950 | rc = ccw_device_start(ch->cdev, &ch->ccw[0], | ||
951 | (unsigned long) ch, 0xff, 0); | ||
952 | if (rc != 0) { | ||
953 | fsm_newstate(fi, CH_STATE_RXINIT); | ||
954 | ccw_check_return_code(ch, rc, "initial RX"); | ||
955 | } else | ||
956 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
957 | DEV_EVENT_RXUP, dev); | ||
958 | } else { | ||
959 | ctc_pr_debug("%s: Initial RX count %d not %d\n", | ||
960 | dev->name, buflen, CTC_INITIAL_BLOCKLEN); | ||
961 | ch_action_firstio(fi, event, arg); | ||
962 | } | ||
963 | } | ||
964 | |||
965 | /** | ||
966 | * Set channel into extended mode. | ||
967 | * | ||
968 | * @param fi An instance of a channel statemachine. | ||
969 | * @param event The event, just happened. | ||
970 | * @param arg Generic pointer, casted from channel * upon call. | ||
971 | */ | ||
972 | static void | ||
973 | ch_action_setmode(fsm_instance * fi, int event, void *arg) | ||
974 | { | ||
975 | struct channel *ch = (struct channel *) arg; | ||
976 | int rc; | ||
977 | unsigned long saveflags; | ||
978 | |||
979 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
980 | fsm_deltimer(&ch->timer); | ||
981 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
982 | fsm_newstate(fi, CH_STATE_SETUPWAIT); | ||
983 | saveflags = 0; /* avoids compiler warning with | ||
984 | spin_unlock_irqrestore */ | ||
985 | if (event == CH_EVENT_TIMER) // only for timer not yet locked | ||
986 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | ||
987 | rc = ccw_device_start(ch->cdev, &ch->ccw[6], (unsigned long) ch, 0xff, 0); | ||
988 | if (event == CH_EVENT_TIMER) | ||
989 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | ||
990 | if (rc != 0) { | ||
991 | fsm_deltimer(&ch->timer); | ||
992 | fsm_newstate(fi, CH_STATE_STARTWAIT); | ||
993 | ccw_check_return_code(ch, rc, "set Mode"); | ||
994 | } else | ||
995 | ch->retry = 0; | ||
996 | } | ||
997 | |||
998 | /** | ||
999 | * Setup channel. | ||
1000 | * | ||
1001 | * @param fi An instance of a channel statemachine. | ||
1002 | * @param event The event, just happened. | ||
1003 | * @param arg Generic pointer, casted from channel * upon call. | ||
1004 | */ | ||
1005 | static void | ||
1006 | ch_action_start(fsm_instance * fi, int event, void *arg) | ||
1007 | { | ||
1008 | struct channel *ch = (struct channel *) arg; | ||
1009 | unsigned long saveflags; | ||
1010 | int rc; | ||
1011 | struct net_device *dev; | ||
1012 | |||
1013 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
1014 | if (ch == NULL) { | ||
1015 | ctc_pr_warn("ch_action_start ch=NULL\n"); | ||
1016 | return; | ||
1017 | } | ||
1018 | if (ch->netdev == NULL) { | ||
1019 | ctc_pr_warn("ch_action_start dev=NULL, id=%s\n", ch->id); | ||
1020 | return; | ||
1021 | } | ||
1022 | dev = ch->netdev; | ||
1023 | |||
1024 | #ifdef DEBUG | ||
1025 | ctc_pr_debug("%s: %s channel start\n", dev->name, | ||
1026 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); | ||
1027 | #endif | ||
1028 | |||
1029 | if (ch->trans_skb != NULL) { | ||
1030 | clear_normalized_cda(&ch->ccw[1]); | ||
1031 | dev_kfree_skb(ch->trans_skb); | ||
1032 | ch->trans_skb = NULL; | ||
1033 | } | ||
1034 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1035 | ch->ccw[1].cmd_code = CCW_CMD_READ; | ||
1036 | ch->ccw[1].flags = CCW_FLAG_SLI; | ||
1037 | ch->ccw[1].count = 0; | ||
1038 | } else { | ||
1039 | ch->ccw[1].cmd_code = CCW_CMD_WRITE; | ||
1040 | ch->ccw[1].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | ||
1041 | ch->ccw[1].count = 0; | ||
1042 | } | ||
1043 | if (ctc_checkalloc_buffer(ch, 0)) { | ||
1044 | ctc_pr_notice( | ||
1045 | "%s: Could not allocate %s trans_skb, delaying " | ||
1046 | "allocation until first transfer\n", | ||
1047 | dev->name, | ||
1048 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); | ||
1049 | } | ||
1050 | |||
1051 | ch->ccw[0].cmd_code = CCW_CMD_PREPARE; | ||
1052 | ch->ccw[0].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | ||
1053 | ch->ccw[0].count = 0; | ||
1054 | ch->ccw[0].cda = 0; | ||
1055 | ch->ccw[2].cmd_code = CCW_CMD_NOOP; /* jointed CE + DE */ | ||
1056 | ch->ccw[2].flags = CCW_FLAG_SLI; | ||
1057 | ch->ccw[2].count = 0; | ||
1058 | ch->ccw[2].cda = 0; | ||
1059 | memcpy(&ch->ccw[3], &ch->ccw[0], sizeof (struct ccw1) * 3); | ||
1060 | ch->ccw[4].cda = 0; | ||
1061 | ch->ccw[4].flags &= ~CCW_FLAG_IDA; | ||
1062 | |||
1063 | fsm_newstate(fi, CH_STATE_STARTWAIT); | ||
1064 | fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); | ||
1065 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | ||
1066 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); | ||
1067 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | ||
1068 | if (rc != 0) { | ||
1069 | if (rc != -EBUSY) | ||
1070 | fsm_deltimer(&ch->timer); | ||
1071 | ccw_check_return_code(ch, rc, "initial HaltIO"); | ||
1072 | } | ||
1073 | #ifdef DEBUG | ||
1074 | ctc_pr_debug("ctc: %s(): leaving\n", __func__); | ||
1075 | #endif | ||
1076 | } | ||
1077 | |||
1078 | /** | ||
1079 | * Shutdown a channel. | ||
1080 | * | ||
1081 | * @param fi An instance of a channel statemachine. | ||
1082 | * @param event The event, just happened. | ||
1083 | * @param arg Generic pointer, casted from channel * upon call. | ||
1084 | */ | ||
1085 | static void | ||
1086 | ch_action_haltio(fsm_instance * fi, int event, void *arg) | ||
1087 | { | ||
1088 | struct channel *ch = (struct channel *) arg; | ||
1089 | unsigned long saveflags; | ||
1090 | int rc; | ||
1091 | int oldstate; | ||
1092 | |||
1093 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1094 | fsm_deltimer(&ch->timer); | ||
1095 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
1096 | saveflags = 0; /* avoids comp warning with | ||
1097 | spin_unlock_irqrestore */ | ||
1098 | if (event == CH_EVENT_STOP) // only for STOP not yet locked | ||
1099 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | ||
1100 | oldstate = fsm_getstate(fi); | ||
1101 | fsm_newstate(fi, CH_STATE_TERM); | ||
1102 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); | ||
1103 | if (event == CH_EVENT_STOP) | ||
1104 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | ||
1105 | if (rc != 0) { | ||
1106 | if (rc != -EBUSY) { | ||
1107 | fsm_deltimer(&ch->timer); | ||
1108 | fsm_newstate(fi, oldstate); | ||
1109 | } | ||
1110 | ccw_check_return_code(ch, rc, "HaltIO in ch_action_haltio"); | ||
1111 | } | ||
1112 | } | ||
1113 | |||
1114 | /** | ||
1115 | * A channel has successfully been halted. | ||
1116 | * Cleanup it's queue and notify interface statemachine. | ||
1117 | * | ||
1118 | * @param fi An instance of a channel statemachine. | ||
1119 | * @param event The event, just happened. | ||
1120 | * @param arg Generic pointer, casted from channel * upon call. | ||
1121 | */ | ||
1122 | static void | ||
1123 | ch_action_stopped(fsm_instance * fi, int event, void *arg) | ||
1124 | { | ||
1125 | struct channel *ch = (struct channel *) arg; | ||
1126 | struct net_device *dev = ch->netdev; | ||
1127 | |||
1128 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1129 | fsm_deltimer(&ch->timer); | ||
1130 | fsm_newstate(fi, CH_STATE_STOPPED); | ||
1131 | if (ch->trans_skb != NULL) { | ||
1132 | clear_normalized_cda(&ch->ccw[1]); | ||
1133 | dev_kfree_skb(ch->trans_skb); | ||
1134 | ch->trans_skb = NULL; | ||
1135 | } | ||
1136 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1137 | skb_queue_purge(&ch->io_queue); | ||
1138 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1139 | DEV_EVENT_RXDOWN, dev); | ||
1140 | } else { | ||
1141 | ctc_purge_skb_queue(&ch->io_queue); | ||
1142 | spin_lock(&ch->collect_lock); | ||
1143 | ctc_purge_skb_queue(&ch->collect_queue); | ||
1144 | ch->collect_len = 0; | ||
1145 | spin_unlock(&ch->collect_lock); | ||
1146 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1147 | DEV_EVENT_TXDOWN, dev); | ||
1148 | } | ||
1149 | } | ||
1150 | |||
1151 | /** | ||
1152 | * A stop command from device statemachine arrived and we are in | ||
1153 | * not operational mode. Set state to stopped. | ||
1154 | * | ||
1155 | * @param fi An instance of a channel statemachine. | ||
1156 | * @param event The event, just happened. | ||
1157 | * @param arg Generic pointer, casted from channel * upon call. | ||
1158 | */ | ||
1159 | static void | ||
1160 | ch_action_stop(fsm_instance * fi, int event, void *arg) | ||
1161 | { | ||
1162 | fsm_newstate(fi, CH_STATE_STOPPED); | ||
1163 | } | ||
1164 | |||
1165 | /** | ||
1166 | * A machine check for no path, not operational status or gone device has | ||
1167 | * happened. | ||
1168 | * Cleanup queue and notify interface statemachine. | ||
1169 | * | ||
1170 | * @param fi An instance of a channel statemachine. | ||
1171 | * @param event The event, just happened. | ||
1172 | * @param arg Generic pointer, casted from channel * upon call. | ||
1173 | */ | ||
1174 | static void | ||
1175 | ch_action_fail(fsm_instance * fi, int event, void *arg) | ||
1176 | { | ||
1177 | struct channel *ch = (struct channel *) arg; | ||
1178 | struct net_device *dev = ch->netdev; | ||
1179 | |||
1180 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1181 | fsm_deltimer(&ch->timer); | ||
1182 | fsm_newstate(fi, CH_STATE_NOTOP); | ||
1183 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1184 | skb_queue_purge(&ch->io_queue); | ||
1185 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1186 | DEV_EVENT_RXDOWN, dev); | ||
1187 | } else { | ||
1188 | ctc_purge_skb_queue(&ch->io_queue); | ||
1189 | spin_lock(&ch->collect_lock); | ||
1190 | ctc_purge_skb_queue(&ch->collect_queue); | ||
1191 | ch->collect_len = 0; | ||
1192 | spin_unlock(&ch->collect_lock); | ||
1193 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1194 | DEV_EVENT_TXDOWN, dev); | ||
1195 | } | ||
1196 | } | ||
1197 | |||
1198 | /** | ||
1199 | * Handle error during setup of channel. | ||
1200 | * | ||
1201 | * @param fi An instance of a channel statemachine. | ||
1202 | * @param event The event, just happened. | ||
1203 | * @param arg Generic pointer, casted from channel * upon call. | ||
1204 | */ | ||
1205 | static void | ||
1206 | ch_action_setuperr(fsm_instance * fi, int event, void *arg) | ||
1207 | { | ||
1208 | struct channel *ch = (struct channel *) arg; | ||
1209 | struct net_device *dev = ch->netdev; | ||
1210 | |||
1211 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
1212 | /** | ||
1213 | * Special case: Got UC_RCRESET on setmode. | ||
1214 | * This means that remote side isn't setup. In this case | ||
1215 | * simply retry after some 10 secs... | ||
1216 | */ | ||
1217 | if ((fsm_getstate(fi) == CH_STATE_SETUPWAIT) && | ||
1218 | ((event == CH_EVENT_UC_RCRESET) || | ||
1219 | (event == CH_EVENT_UC_RSRESET))) { | ||
1220 | fsm_newstate(fi, CH_STATE_STARTRETRY); | ||
1221 | fsm_deltimer(&ch->timer); | ||
1222 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
1223 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1224 | int rc = ccw_device_halt(ch->cdev, (unsigned long) ch); | ||
1225 | if (rc != 0) | ||
1226 | ccw_check_return_code( | ||
1227 | ch, rc, "HaltIO in ch_action_setuperr"); | ||
1228 | } | ||
1229 | return; | ||
1230 | } | ||
1231 | |||
1232 | ctc_pr_debug("%s: Error %s during %s channel setup state=%s\n", | ||
1233 | dev->name, ch_event_names[event], | ||
1234 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX", | ||
1235 | fsm_getstate_str(fi)); | ||
1236 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1237 | fsm_newstate(fi, CH_STATE_RXERR); | ||
1238 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1239 | DEV_EVENT_RXDOWN, dev); | ||
1240 | } else { | ||
1241 | fsm_newstate(fi, CH_STATE_TXERR); | ||
1242 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1243 | DEV_EVENT_TXDOWN, dev); | ||
1244 | } | ||
1245 | } | ||
1246 | |||
1247 | /** | ||
1248 | * Restart a channel after an error. | ||
1249 | * | ||
1250 | * @param fi An instance of a channel statemachine. | ||
1251 | * @param event The event, just happened. | ||
1252 | * @param arg Generic pointer, casted from channel * upon call. | ||
1253 | */ | ||
1254 | static void | ||
1255 | ch_action_restart(fsm_instance * fi, int event, void *arg) | ||
1256 | { | ||
1257 | unsigned long saveflags; | ||
1258 | int oldstate; | ||
1259 | int rc; | ||
1260 | |||
1261 | struct channel *ch = (struct channel *) arg; | ||
1262 | struct net_device *dev = ch->netdev; | ||
1263 | |||
1264 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1265 | fsm_deltimer(&ch->timer); | ||
1266 | ctc_pr_debug("%s: %s channel restart\n", dev->name, | ||
1267 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); | ||
1268 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
1269 | oldstate = fsm_getstate(fi); | ||
1270 | fsm_newstate(fi, CH_STATE_STARTWAIT); | ||
1271 | saveflags = 0; /* avoids compiler warning with | ||
1272 | spin_unlock_irqrestore */ | ||
1273 | if (event == CH_EVENT_TIMER) // only for timer not yet locked | ||
1274 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | ||
1275 | rc = ccw_device_halt(ch->cdev, (unsigned long) ch); | ||
1276 | if (event == CH_EVENT_TIMER) | ||
1277 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | ||
1278 | if (rc != 0) { | ||
1279 | if (rc != -EBUSY) { | ||
1280 | fsm_deltimer(&ch->timer); | ||
1281 | fsm_newstate(fi, oldstate); | ||
1282 | } | ||
1283 | ccw_check_return_code(ch, rc, "HaltIO in ch_action_restart"); | ||
1284 | } | ||
1285 | } | ||
1286 | |||
1287 | /** | ||
1288 | * Handle error during RX initial handshake (exchange of | ||
1289 | * 0-length block header) | ||
1290 | * | ||
1291 | * @param fi An instance of a channel statemachine. | ||
1292 | * @param event The event, just happened. | ||
1293 | * @param arg Generic pointer, casted from channel * upon call. | ||
1294 | */ | ||
1295 | static void | ||
1296 | ch_action_rxiniterr(fsm_instance * fi, int event, void *arg) | ||
1297 | { | ||
1298 | struct channel *ch = (struct channel *) arg; | ||
1299 | struct net_device *dev = ch->netdev; | ||
1300 | |||
1301 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
1302 | if (event == CH_EVENT_TIMER) { | ||
1303 | fsm_deltimer(&ch->timer); | ||
1304 | ctc_pr_debug("%s: Timeout during RX init handshake\n", dev->name); | ||
1305 | if (ch->retry++ < 3) | ||
1306 | ch_action_restart(fi, event, arg); | ||
1307 | else { | ||
1308 | fsm_newstate(fi, CH_STATE_RXERR); | ||
1309 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1310 | DEV_EVENT_RXDOWN, dev); | ||
1311 | } | ||
1312 | } else | ||
1313 | ctc_pr_warn("%s: Error during RX init handshake\n", dev->name); | ||
1314 | } | ||
1315 | |||
1316 | /** | ||
1317 | * Notify device statemachine if we gave up initialization | ||
1318 | * of RX channel. | ||
1319 | * | ||
1320 | * @param fi An instance of a channel statemachine. | ||
1321 | * @param event The event, just happened. | ||
1322 | * @param arg Generic pointer, casted from channel * upon call. | ||
1323 | */ | ||
1324 | static void | ||
1325 | ch_action_rxinitfail(fsm_instance * fi, int event, void *arg) | ||
1326 | { | ||
1327 | struct channel *ch = (struct channel *) arg; | ||
1328 | struct net_device *dev = ch->netdev; | ||
1329 | |||
1330 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
1331 | fsm_newstate(fi, CH_STATE_RXERR); | ||
1332 | ctc_pr_warn("%s: RX initialization failed\n", dev->name); | ||
1333 | ctc_pr_warn("%s: RX <-> RX connection detected\n", dev->name); | ||
1334 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); | ||
1335 | } | ||
1336 | |||
1337 | /** | ||
1338 | * Handle RX Unit check remote reset (remote disconnected) | ||
1339 | * | ||
1340 | * @param fi An instance of a channel statemachine. | ||
1341 | * @param event The event, just happened. | ||
1342 | * @param arg Generic pointer, casted from channel * upon call. | ||
1343 | */ | ||
1344 | static void | ||
1345 | ch_action_rxdisc(fsm_instance * fi, int event, void *arg) | ||
1346 | { | ||
1347 | struct channel *ch = (struct channel *) arg; | ||
1348 | struct channel *ch2; | ||
1349 | struct net_device *dev = ch->netdev; | ||
1350 | |||
1351 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1352 | fsm_deltimer(&ch->timer); | ||
1353 | ctc_pr_debug("%s: Got remote disconnect, re-initializing ...\n", | ||
1354 | dev->name); | ||
1355 | |||
1356 | /** | ||
1357 | * Notify device statemachine | ||
1358 | */ | ||
1359 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_RXDOWN, dev); | ||
1360 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_TXDOWN, dev); | ||
1361 | |||
1362 | fsm_newstate(fi, CH_STATE_DTERM); | ||
1363 | ch2 = ((struct ctc_priv *) dev->priv)->channel[WRITE]; | ||
1364 | fsm_newstate(ch2->fsm, CH_STATE_DTERM); | ||
1365 | |||
1366 | ccw_device_halt(ch->cdev, (unsigned long) ch); | ||
1367 | ccw_device_halt(ch2->cdev, (unsigned long) ch2); | ||
1368 | } | ||
1369 | |||
1370 | /** | ||
1371 | * Handle error during TX channel initialization. | ||
1372 | * | ||
1373 | * @param fi An instance of a channel statemachine. | ||
1374 | * @param event The event, just happened. | ||
1375 | * @param arg Generic pointer, casted from channel * upon call. | ||
1376 | */ | ||
1377 | static void | ||
1378 | ch_action_txiniterr(fsm_instance * fi, int event, void *arg) | ||
1379 | { | ||
1380 | struct channel *ch = (struct channel *) arg; | ||
1381 | struct net_device *dev = ch->netdev; | ||
1382 | |||
1383 | DBF_TEXT(setup, 2, __FUNCTION__); | ||
1384 | if (event == CH_EVENT_TIMER) { | ||
1385 | fsm_deltimer(&ch->timer); | ||
1386 | ctc_pr_debug("%s: Timeout during TX init handshake\n", dev->name); | ||
1387 | if (ch->retry++ < 3) | ||
1388 | ch_action_restart(fi, event, arg); | ||
1389 | else { | ||
1390 | fsm_newstate(fi, CH_STATE_TXERR); | ||
1391 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1392 | DEV_EVENT_TXDOWN, dev); | ||
1393 | } | ||
1394 | } else | ||
1395 | ctc_pr_warn("%s: Error during TX init handshake\n", dev->name); | ||
1396 | } | ||
1397 | |||
1398 | /** | ||
1399 | * Handle TX timeout by retrying operation. | ||
1400 | * | ||
1401 | * @param fi An instance of a channel statemachine. | ||
1402 | * @param event The event, just happened. | ||
1403 | * @param arg Generic pointer, casted from channel * upon call. | ||
1404 | */ | ||
1405 | static void | ||
1406 | ch_action_txretry(fsm_instance * fi, int event, void *arg) | ||
1407 | { | ||
1408 | struct channel *ch = (struct channel *) arg; | ||
1409 | struct net_device *dev = ch->netdev; | ||
1410 | unsigned long saveflags; | ||
1411 | |||
1412 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
1413 | fsm_deltimer(&ch->timer); | ||
1414 | if (ch->retry++ > 3) { | ||
1415 | ctc_pr_debug("%s: TX retry failed, restarting channel\n", | ||
1416 | dev->name); | ||
1417 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1418 | DEV_EVENT_TXDOWN, dev); | ||
1419 | ch_action_restart(fi, event, arg); | ||
1420 | } else { | ||
1421 | struct sk_buff *skb; | ||
1422 | |||
1423 | ctc_pr_debug("%s: TX retry %d\n", dev->name, ch->retry); | ||
1424 | if ((skb = skb_peek(&ch->io_queue))) { | ||
1425 | int rc = 0; | ||
1426 | |||
1427 | clear_normalized_cda(&ch->ccw[4]); | ||
1428 | ch->ccw[4].count = skb->len; | ||
1429 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | ||
1430 | ctc_pr_debug( | ||
1431 | "%s: IDAL alloc failed, chan restart\n", | ||
1432 | dev->name); | ||
1433 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1434 | DEV_EVENT_TXDOWN, dev); | ||
1435 | ch_action_restart(fi, event, arg); | ||
1436 | return; | ||
1437 | } | ||
1438 | fsm_addtimer(&ch->timer, 1000, CH_EVENT_TIMER, ch); | ||
1439 | saveflags = 0; /* avoids compiler warning with | ||
1440 | spin_unlock_irqrestore */ | ||
1441 | if (event == CH_EVENT_TIMER) // only for TIMER not yet locked | ||
1442 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), | ||
1443 | saveflags); | ||
1444 | rc = ccw_device_start(ch->cdev, &ch->ccw[3], | ||
1445 | (unsigned long) ch, 0xff, 0); | ||
1446 | if (event == CH_EVENT_TIMER) | ||
1447 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), | ||
1448 | saveflags); | ||
1449 | if (rc != 0) { | ||
1450 | fsm_deltimer(&ch->timer); | ||
1451 | ccw_check_return_code(ch, rc, "TX in ch_action_txretry"); | ||
1452 | ctc_purge_skb_queue(&ch->io_queue); | ||
1453 | } | ||
1454 | } | ||
1455 | } | ||
1456 | |||
1457 | } | ||
1458 | |||
1459 | /** | ||
1460 | * Handle fatal errors during an I/O command. | ||
1461 | * | ||
1462 | * @param fi An instance of a channel statemachine. | ||
1463 | * @param event The event, just happened. | ||
1464 | * @param arg Generic pointer, casted from channel * upon call. | ||
1465 | */ | ||
1466 | static void | ||
1467 | ch_action_iofatal(fsm_instance * fi, int event, void *arg) | ||
1468 | { | ||
1469 | struct channel *ch = (struct channel *) arg; | ||
1470 | struct net_device *dev = ch->netdev; | ||
1471 | |||
1472 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1473 | fsm_deltimer(&ch->timer); | ||
1474 | if (CHANNEL_DIRECTION(ch->flags) == READ) { | ||
1475 | ctc_pr_debug("%s: RX I/O error\n", dev->name); | ||
1476 | fsm_newstate(fi, CH_STATE_RXERR); | ||
1477 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1478 | DEV_EVENT_RXDOWN, dev); | ||
1479 | } else { | ||
1480 | ctc_pr_debug("%s: TX I/O error\n", dev->name); | ||
1481 | fsm_newstate(fi, CH_STATE_TXERR); | ||
1482 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, | ||
1483 | DEV_EVENT_TXDOWN, dev); | ||
1484 | } | ||
1485 | } | ||
1486 | |||
1487 | static void | ||
1488 | ch_action_reinit(fsm_instance *fi, int event, void *arg) | ||
1489 | { | ||
1490 | struct channel *ch = (struct channel *)arg; | ||
1491 | struct net_device *dev = ch->netdev; | ||
1492 | struct ctc_priv *privptr = dev->priv; | ||
1493 | |||
1494 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
1495 | ch_action_iofatal(fi, event, arg); | ||
1496 | fsm_addtimer(&privptr->restart_timer, 1000, DEV_EVENT_RESTART, dev); | ||
1497 | } | ||
1498 | |||
1499 | /** | ||
1500 | * The statemachine for a channel. | ||
1501 | */ | ||
1502 | static const fsm_node ch_fsm[] = { | ||
1503 | {CH_STATE_STOPPED, CH_EVENT_STOP, fsm_action_nop }, | ||
1504 | {CH_STATE_STOPPED, CH_EVENT_START, ch_action_start }, | ||
1505 | {CH_STATE_STOPPED, CH_EVENT_FINSTAT, fsm_action_nop }, | ||
1506 | {CH_STATE_STOPPED, CH_EVENT_MC_FAIL, fsm_action_nop }, | ||
1507 | |||
1508 | {CH_STATE_NOTOP, CH_EVENT_STOP, ch_action_stop }, | ||
1509 | {CH_STATE_NOTOP, CH_EVENT_START, fsm_action_nop }, | ||
1510 | {CH_STATE_NOTOP, CH_EVENT_FINSTAT, fsm_action_nop }, | ||
1511 | {CH_STATE_NOTOP, CH_EVENT_MC_FAIL, fsm_action_nop }, | ||
1512 | {CH_STATE_NOTOP, CH_EVENT_MC_GOOD, ch_action_start }, | ||
1513 | |||
1514 | {CH_STATE_STARTWAIT, CH_EVENT_STOP, ch_action_haltio }, | ||
1515 | {CH_STATE_STARTWAIT, CH_EVENT_START, fsm_action_nop }, | ||
1516 | {CH_STATE_STARTWAIT, CH_EVENT_FINSTAT, ch_action_setmode }, | ||
1517 | {CH_STATE_STARTWAIT, CH_EVENT_TIMER, ch_action_setuperr }, | ||
1518 | {CH_STATE_STARTWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1519 | {CH_STATE_STARTWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1520 | {CH_STATE_STARTWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1521 | |||
1522 | {CH_STATE_STARTRETRY, CH_EVENT_STOP, ch_action_haltio }, | ||
1523 | {CH_STATE_STARTRETRY, CH_EVENT_TIMER, ch_action_setmode }, | ||
1524 | {CH_STATE_STARTRETRY, CH_EVENT_FINSTAT, fsm_action_nop }, | ||
1525 | {CH_STATE_STARTRETRY, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1526 | |||
1527 | {CH_STATE_SETUPWAIT, CH_EVENT_STOP, ch_action_haltio }, | ||
1528 | {CH_STATE_SETUPWAIT, CH_EVENT_START, fsm_action_nop }, | ||
1529 | {CH_STATE_SETUPWAIT, CH_EVENT_FINSTAT, ch_action_firstio }, | ||
1530 | {CH_STATE_SETUPWAIT, CH_EVENT_UC_RCRESET, ch_action_setuperr }, | ||
1531 | {CH_STATE_SETUPWAIT, CH_EVENT_UC_RSRESET, ch_action_setuperr }, | ||
1532 | {CH_STATE_SETUPWAIT, CH_EVENT_TIMER, ch_action_setmode }, | ||
1533 | {CH_STATE_SETUPWAIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1534 | {CH_STATE_SETUPWAIT, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1535 | {CH_STATE_SETUPWAIT, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1536 | |||
1537 | {CH_STATE_RXINIT, CH_EVENT_STOP, ch_action_haltio }, | ||
1538 | {CH_STATE_RXINIT, CH_EVENT_START, fsm_action_nop }, | ||
1539 | {CH_STATE_RXINIT, CH_EVENT_FINSTAT, ch_action_rxidle }, | ||
1540 | {CH_STATE_RXINIT, CH_EVENT_UC_RCRESET, ch_action_rxiniterr }, | ||
1541 | {CH_STATE_RXINIT, CH_EVENT_UC_RSRESET, ch_action_rxiniterr }, | ||
1542 | {CH_STATE_RXINIT, CH_EVENT_TIMER, ch_action_rxiniterr }, | ||
1543 | {CH_STATE_RXINIT, CH_EVENT_ATTNBUSY, ch_action_rxinitfail }, | ||
1544 | {CH_STATE_RXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1545 | {CH_STATE_RXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1546 | {CH_STATE_RXINIT, CH_EVENT_UC_ZERO, ch_action_firstio }, | ||
1547 | {CH_STATE_RXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1548 | |||
1549 | {CH_STATE_RXIDLE, CH_EVENT_STOP, ch_action_haltio }, | ||
1550 | {CH_STATE_RXIDLE, CH_EVENT_START, fsm_action_nop }, | ||
1551 | {CH_STATE_RXIDLE, CH_EVENT_FINSTAT, ch_action_rx }, | ||
1552 | {CH_STATE_RXIDLE, CH_EVENT_UC_RCRESET, ch_action_rxdisc }, | ||
1553 | // {CH_STATE_RXIDLE, CH_EVENT_UC_RSRESET, ch_action_rxretry }, | ||
1554 | {CH_STATE_RXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1555 | {CH_STATE_RXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1556 | {CH_STATE_RXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1557 | {CH_STATE_RXIDLE, CH_EVENT_UC_ZERO, ch_action_rx }, | ||
1558 | |||
1559 | {CH_STATE_TXINIT, CH_EVENT_STOP, ch_action_haltio }, | ||
1560 | {CH_STATE_TXINIT, CH_EVENT_START, fsm_action_nop }, | ||
1561 | {CH_STATE_TXINIT, CH_EVENT_FINSTAT, ch_action_txidle }, | ||
1562 | {CH_STATE_TXINIT, CH_EVENT_UC_RCRESET, ch_action_txiniterr }, | ||
1563 | {CH_STATE_TXINIT, CH_EVENT_UC_RSRESET, ch_action_txiniterr }, | ||
1564 | {CH_STATE_TXINIT, CH_EVENT_TIMER, ch_action_txiniterr }, | ||
1565 | {CH_STATE_TXINIT, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1566 | {CH_STATE_TXINIT, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1567 | {CH_STATE_TXINIT, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1568 | |||
1569 | {CH_STATE_TXIDLE, CH_EVENT_STOP, ch_action_haltio }, | ||
1570 | {CH_STATE_TXIDLE, CH_EVENT_START, fsm_action_nop }, | ||
1571 | {CH_STATE_TXIDLE, CH_EVENT_FINSTAT, ch_action_firstio }, | ||
1572 | {CH_STATE_TXIDLE, CH_EVENT_UC_RCRESET, fsm_action_nop }, | ||
1573 | {CH_STATE_TXIDLE, CH_EVENT_UC_RSRESET, fsm_action_nop }, | ||
1574 | {CH_STATE_TXIDLE, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1575 | {CH_STATE_TXIDLE, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1576 | {CH_STATE_TXIDLE, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1577 | |||
1578 | {CH_STATE_TERM, CH_EVENT_STOP, fsm_action_nop }, | ||
1579 | {CH_STATE_TERM, CH_EVENT_START, ch_action_restart }, | ||
1580 | {CH_STATE_TERM, CH_EVENT_FINSTAT, ch_action_stopped }, | ||
1581 | {CH_STATE_TERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, | ||
1582 | {CH_STATE_TERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, | ||
1583 | {CH_STATE_TERM, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1584 | |||
1585 | {CH_STATE_DTERM, CH_EVENT_STOP, ch_action_haltio }, | ||
1586 | {CH_STATE_DTERM, CH_EVENT_START, ch_action_restart }, | ||
1587 | {CH_STATE_DTERM, CH_EVENT_FINSTAT, ch_action_setmode }, | ||
1588 | {CH_STATE_DTERM, CH_EVENT_UC_RCRESET, fsm_action_nop }, | ||
1589 | {CH_STATE_DTERM, CH_EVENT_UC_RSRESET, fsm_action_nop }, | ||
1590 | {CH_STATE_DTERM, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1591 | |||
1592 | {CH_STATE_TX, CH_EVENT_STOP, ch_action_haltio }, | ||
1593 | {CH_STATE_TX, CH_EVENT_START, fsm_action_nop }, | ||
1594 | {CH_STATE_TX, CH_EVENT_FINSTAT, ch_action_txdone }, | ||
1595 | {CH_STATE_TX, CH_EVENT_UC_RCRESET, ch_action_txretry }, | ||
1596 | {CH_STATE_TX, CH_EVENT_UC_RSRESET, ch_action_txretry }, | ||
1597 | {CH_STATE_TX, CH_EVENT_TIMER, ch_action_txretry }, | ||
1598 | {CH_STATE_TX, CH_EVENT_IO_ENODEV, ch_action_iofatal }, | ||
1599 | {CH_STATE_TX, CH_EVENT_IO_EIO, ch_action_reinit }, | ||
1600 | {CH_STATE_TX, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1601 | |||
1602 | {CH_STATE_RXERR, CH_EVENT_STOP, ch_action_haltio }, | ||
1603 | {CH_STATE_TXERR, CH_EVENT_STOP, ch_action_haltio }, | ||
1604 | {CH_STATE_TXERR, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1605 | {CH_STATE_RXERR, CH_EVENT_MC_FAIL, ch_action_fail }, | ||
1606 | }; | ||
1607 | |||
1608 | static const int CH_FSM_LEN = sizeof (ch_fsm) / sizeof (fsm_node); | ||
1609 | |||
1610 | /** | ||
1611 | * Functions related to setup and device detection. | ||
1612 | *****************************************************************************/ | ||
1613 | |||
1614 | static inline int | ||
1615 | less_than(char *id1, char *id2) | ||
1616 | { | ||
1617 | int dev1, dev2, i; | ||
1618 | |||
1619 | for (i = 0; i < 5; i++) { | ||
1620 | id1++; | ||
1621 | id2++; | ||
1622 | } | ||
1623 | dev1 = simple_strtoul(id1, &id1, 16); | ||
1624 | dev2 = simple_strtoul(id2, &id2, 16); | ||
1625 | |||
1626 | return (dev1 < dev2); | ||
1627 | } | ||
1628 | |||
1629 | /** | ||
1630 | * Add a new channel to the list of channels. | ||
1631 | * Keeps the channel list sorted. | ||
1632 | * | ||
1633 | * @param cdev The ccw_device to be added. | ||
1634 | * @param type The type class of the new channel. | ||
1635 | * | ||
1636 | * @return 0 on success, !0 on error. | ||
1637 | */ | ||
1638 | static int | ||
1639 | add_channel(struct ccw_device *cdev, enum channel_types type) | ||
1640 | { | ||
1641 | struct channel **c = &channels; | ||
1642 | struct channel *ch; | ||
1643 | |||
1644 | DBF_TEXT(trace, 2, __FUNCTION__); | ||
1645 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); | ||
1646 | if (!ch) { | ||
1647 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); | ||
1648 | return -1; | ||
1649 | } | ||
1650 | /* assure all flags and counters are reset */ | ||
1651 | ch->ccw = kzalloc(8 * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); | ||
1652 | if (!ch->ccw) { | ||
1653 | kfree(ch); | ||
1654 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); | ||
1655 | return -1; | ||
1656 | } | ||
1657 | |||
1658 | |||
1659 | /** | ||
1660 | * "static" ccws are used in the following way: | ||
1661 | * | ||
1662 | * ccw[0..2] (Channel program for generic I/O): | ||
1663 | * 0: prepare | ||
1664 | * 1: read or write (depending on direction) with fixed | ||
1665 | * buffer (idal allocated once when buffer is allocated) | ||
1666 | * 2: nop | ||
1667 | * ccw[3..5] (Channel program for direct write of packets) | ||
1668 | * 3: prepare | ||
1669 | * 4: write (idal allocated on every write). | ||
1670 | * 5: nop | ||
1671 | * ccw[6..7] (Channel program for initial channel setup): | ||
1672 | * 6: set extended mode | ||
1673 | * 7: nop | ||
1674 | * | ||
1675 | * ch->ccw[0..5] are initialized in ch_action_start because | ||
1676 | * the channel's direction is yet unknown here. | ||
1677 | */ | ||
1678 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; | ||
1679 | ch->ccw[6].flags = CCW_FLAG_SLI; | ||
1680 | |||
1681 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; | ||
1682 | ch->ccw[7].flags = CCW_FLAG_SLI; | ||
1683 | |||
1684 | ch->cdev = cdev; | ||
1685 | snprintf(ch->id, CTC_ID_SIZE, "ch-%s", cdev->dev.bus_id); | ||
1686 | ch->type = type; | ||
1687 | ch->fsm = init_fsm(ch->id, ch_state_names, | ||
1688 | ch_event_names, NR_CH_STATES, NR_CH_EVENTS, | ||
1689 | ch_fsm, CH_FSM_LEN, GFP_KERNEL); | ||
1690 | if (ch->fsm == NULL) { | ||
1691 | ctc_pr_warn("ctc: Could not create FSM in add_channel\n"); | ||
1692 | kfree(ch->ccw); | ||
1693 | kfree(ch); | ||
1694 | return -1; | ||
1695 | } | ||
1696 | fsm_newstate(ch->fsm, CH_STATE_IDLE); | ||
1697 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); | ||
1698 | if (!ch->irb) { | ||
1699 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); | ||
1700 | kfree_fsm(ch->fsm); | ||
1701 | kfree(ch->ccw); | ||
1702 | kfree(ch); | ||
1703 | return -1; | ||
1704 | } | ||
1705 | while (*c && less_than((*c)->id, ch->id)) | ||
1706 | c = &(*c)->next; | ||
1707 | if (*c && (!strncmp((*c)->id, ch->id, CTC_ID_SIZE))) { | ||
1708 | ctc_pr_debug( | ||
1709 | "ctc: add_channel: device %s already in list, " | ||
1710 | "using old entry\n", (*c)->id); | ||
1711 | kfree(ch->irb); | ||
1712 | kfree_fsm(ch->fsm); | ||
1713 | kfree(ch->ccw); | ||
1714 | kfree(ch); | ||
1715 | return 0; | ||
1716 | } | ||
1717 | |||
1718 | spin_lock_init(&ch->collect_lock); | ||
1719 | |||
1720 | fsm_settimer(ch->fsm, &ch->timer); | ||
1721 | skb_queue_head_init(&ch->io_queue); | ||
1722 | skb_queue_head_init(&ch->collect_queue); | ||
1723 | ch->next = *c; | ||
1724 | *c = ch; | ||
1725 | return 0; | ||
1726 | } | ||
1727 | |||
1728 | /** | ||
1729 | * Release a specific channel in the channel list. | ||
1730 | * | ||
1731 | * @param ch Pointer to channel struct to be released. | ||
1732 | */ | ||
1733 | static void | ||
1734 | channel_free(struct channel *ch) | ||
1735 | { | ||
1736 | ch->flags &= ~CHANNEL_FLAGS_INUSE; | ||
1737 | fsm_newstate(ch->fsm, CH_STATE_IDLE); | ||
1738 | } | ||
1739 | |||
1740 | /** | ||
1741 | * Remove a specific channel in the channel list. | ||
1742 | * | ||
1743 | * @param ch Pointer to channel struct to be released. | ||
1744 | */ | ||
1745 | static void | ||
1746 | channel_remove(struct channel *ch) | ||
1747 | { | ||
1748 | struct channel **c = &channels; | ||
1749 | |||
1750 | DBF_TEXT(trace, 2, __FUNCTION__); | ||
1751 | if (ch == NULL) | ||
1752 | return; | ||
1753 | |||
1754 | channel_free(ch); | ||
1755 | while (*c) { | ||
1756 | if (*c == ch) { | ||
1757 | *c = ch->next; | ||
1758 | fsm_deltimer(&ch->timer); | ||
1759 | kfree_fsm(ch->fsm); | ||
1760 | clear_normalized_cda(&ch->ccw[4]); | ||
1761 | if (ch->trans_skb != NULL) { | ||
1762 | clear_normalized_cda(&ch->ccw[1]); | ||
1763 | dev_kfree_skb(ch->trans_skb); | ||
1764 | } | ||
1765 | kfree(ch->ccw); | ||
1766 | kfree(ch->irb); | ||
1767 | kfree(ch); | ||
1768 | return; | ||
1769 | } | ||
1770 | c = &((*c)->next); | ||
1771 | } | ||
1772 | } | ||
1773 | |||
1774 | /** | ||
1775 | * Get a specific channel from the channel list. | ||
1776 | * | ||
1777 | * @param type Type of channel we are interested in. | ||
1778 | * @param id Id of channel we are interested in. | ||
1779 | * @param direction Direction we want to use this channel for. | ||
1780 | * | ||
1781 | * @return Pointer to a channel or NULL if no matching channel available. | ||
1782 | */ | ||
1783 | static struct channel | ||
1784 | * | ||
1785 | channel_get(enum channel_types type, char *id, int direction) | ||
1786 | { | ||
1787 | struct channel *ch = channels; | ||
1788 | |||
1789 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
1790 | #ifdef DEBUG | ||
1791 | ctc_pr_debug("ctc: %s(): searching for ch with id %s and type %d\n", | ||
1792 | __func__, id, type); | ||
1793 | #endif | ||
1794 | |||
1795 | while (ch && ((strncmp(ch->id, id, CTC_ID_SIZE)) || (ch->type != type))) { | ||
1796 | #ifdef DEBUG | ||
1797 | ctc_pr_debug("ctc: %s(): ch=0x%p (id=%s, type=%d\n", | ||
1798 | __func__, ch, ch->id, ch->type); | ||
1799 | #endif | ||
1800 | ch = ch->next; | ||
1801 | } | ||
1802 | #ifdef DEBUG | ||
1803 | ctc_pr_debug("ctc: %s(): ch=0x%pq (id=%s, type=%d\n", | ||
1804 | __func__, ch, ch->id, ch->type); | ||
1805 | #endif | ||
1806 | if (!ch) { | ||
1807 | ctc_pr_warn("ctc: %s(): channel with id %s " | ||
1808 | "and type %d not found in channel list\n", | ||
1809 | __func__, id, type); | ||
1810 | } else { | ||
1811 | if (ch->flags & CHANNEL_FLAGS_INUSE) | ||
1812 | ch = NULL; | ||
1813 | else { | ||
1814 | ch->flags |= CHANNEL_FLAGS_INUSE; | ||
1815 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; | ||
1816 | ch->flags |= (direction == WRITE) | ||
1817 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; | ||
1818 | fsm_newstate(ch->fsm, CH_STATE_STOPPED); | ||
1819 | } | ||
1820 | } | ||
1821 | return ch; | ||
1822 | } | ||
1823 | |||
1824 | /** | ||
1825 | * Return the channel type by name. | ||
1826 | * | ||
1827 | * @param name Name of network interface. | ||
1828 | * | ||
1829 | * @return Type class of channel to be used for that interface. | ||
1830 | */ | ||
1831 | static enum channel_types inline | ||
1832 | extract_channel_media(char *name) | ||
1833 | { | ||
1834 | enum channel_types ret = channel_type_unknown; | ||
1835 | |||
1836 | if (name != NULL) { | ||
1837 | if (strncmp(name, "ctc", 3) == 0) | ||
1838 | ret = channel_type_parallel; | ||
1839 | if (strncmp(name, "escon", 5) == 0) | ||
1840 | ret = channel_type_escon; | ||
1841 | } | ||
1842 | return ret; | ||
1843 | } | ||
1844 | |||
1845 | static long | ||
1846 | __ctc_check_irb_error(struct ccw_device *cdev, struct irb *irb) | ||
1847 | { | ||
1848 | if (!IS_ERR(irb)) | ||
1849 | return 0; | ||
1850 | |||
1851 | switch (PTR_ERR(irb)) { | ||
1852 | case -EIO: | ||
1853 | ctc_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id); | ||
1854 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); | ||
1855 | // CTC_DBF_TEXT_(trace, 2, " rc%d", -EIO); | ||
1856 | break; | ||
1857 | case -ETIMEDOUT: | ||
1858 | ctc_pr_warn("timeout on device %s\n", cdev->dev.bus_id); | ||
1859 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); | ||
1860 | // CTC_DBF_TEXT_(trace, 2, " rc%d", -ETIMEDOUT); | ||
1861 | break; | ||
1862 | default: | ||
1863 | ctc_pr_warn("unknown error %ld on device %s\n", PTR_ERR(irb), | ||
1864 | cdev->dev.bus_id); | ||
1865 | // CTC_DBF_TEXT(trace, 2, "ckirberr"); | ||
1866 | // CTC_DBF_TEXT(trace, 2, " rc???"); | ||
1867 | } | ||
1868 | return PTR_ERR(irb); | ||
1869 | } | ||
1870 | |||
1871 | /** | ||
1872 | * Main IRQ handler. | ||
1873 | * | ||
1874 | * @param cdev The ccw_device the interrupt is for. | ||
1875 | * @param intparm interruption parameter. | ||
1876 | * @param irb interruption response block. | ||
1877 | */ | ||
1878 | static void | ||
1879 | ctc_irq_handler(struct ccw_device *cdev, unsigned long intparm, struct irb *irb) | ||
1880 | { | ||
1881 | struct channel *ch; | ||
1882 | struct net_device *dev; | ||
1883 | struct ctc_priv *priv; | ||
1884 | |||
1885 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
1886 | if (__ctc_check_irb_error(cdev, irb)) | ||
1887 | return; | ||
1888 | |||
1889 | /* Check for unsolicited interrupts. */ | ||
1890 | if (!cdev->dev.driver_data) { | ||
1891 | ctc_pr_warn("ctc: Got unsolicited irq: %s c-%02x d-%02x\n", | ||
1892 | cdev->dev.bus_id, irb->scsw.cstat, | ||
1893 | irb->scsw.dstat); | ||
1894 | return; | ||
1895 | } | ||
1896 | |||
1897 | priv = ((struct ccwgroup_device *)cdev->dev.driver_data) | ||
1898 | ->dev.driver_data; | ||
1899 | |||
1900 | /* Try to extract channel from driver data. */ | ||
1901 | if (priv->channel[READ]->cdev == cdev) | ||
1902 | ch = priv->channel[READ]; | ||
1903 | else if (priv->channel[WRITE]->cdev == cdev) | ||
1904 | ch = priv->channel[WRITE]; | ||
1905 | else { | ||
1906 | ctc_pr_err("ctc: Can't determine channel for interrupt, " | ||
1907 | "device %s\n", cdev->dev.bus_id); | ||
1908 | return; | ||
1909 | } | ||
1910 | |||
1911 | dev = (struct net_device *) (ch->netdev); | ||
1912 | if (dev == NULL) { | ||
1913 | ctc_pr_crit("ctc: ctc_irq_handler dev=NULL bus_id=%s, ch=0x%p\n", | ||
1914 | cdev->dev.bus_id, ch); | ||
1915 | return; | ||
1916 | } | ||
1917 | |||
1918 | #ifdef DEBUG | ||
1919 | ctc_pr_debug("%s: interrupt for device: %s received c-%02x d-%02x\n", | ||
1920 | dev->name, ch->id, irb->scsw.cstat, irb->scsw.dstat); | ||
1921 | #endif | ||
1922 | |||
1923 | /* Copy interruption response block. */ | ||
1924 | memcpy(ch->irb, irb, sizeof(struct irb)); | ||
1925 | |||
1926 | /* Check for good subchannel return code, otherwise error message */ | ||
1927 | if (ch->irb->scsw.cstat) { | ||
1928 | fsm_event(ch->fsm, CH_EVENT_SC_UNKNOWN, ch); | ||
1929 | ctc_pr_warn("%s: subchannel check for device: %s - %02x %02x\n", | ||
1930 | dev->name, ch->id, ch->irb->scsw.cstat, | ||
1931 | ch->irb->scsw.dstat); | ||
1932 | return; | ||
1933 | } | ||
1934 | |||
1935 | /* Check the reason-code of a unit check */ | ||
1936 | if (ch->irb->scsw.dstat & DEV_STAT_UNIT_CHECK) { | ||
1937 | ccw_unit_check(ch, ch->irb->ecw[0]); | ||
1938 | return; | ||
1939 | } | ||
1940 | if (ch->irb->scsw.dstat & DEV_STAT_BUSY) { | ||
1941 | if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) | ||
1942 | fsm_event(ch->fsm, CH_EVENT_ATTNBUSY, ch); | ||
1943 | else | ||
1944 | fsm_event(ch->fsm, CH_EVENT_BUSY, ch); | ||
1945 | return; | ||
1946 | } | ||
1947 | if (ch->irb->scsw.dstat & DEV_STAT_ATTENTION) { | ||
1948 | fsm_event(ch->fsm, CH_EVENT_ATTN, ch); | ||
1949 | return; | ||
1950 | } | ||
1951 | if ((ch->irb->scsw.stctl & SCSW_STCTL_SEC_STATUS) || | ||
1952 | (ch->irb->scsw.stctl == SCSW_STCTL_STATUS_PEND) || | ||
1953 | (ch->irb->scsw.stctl == | ||
1954 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) | ||
1955 | fsm_event(ch->fsm, CH_EVENT_FINSTAT, ch); | ||
1956 | else | ||
1957 | fsm_event(ch->fsm, CH_EVENT_IRQ, ch); | ||
1958 | |||
1959 | } | ||
1960 | |||
1961 | /** | ||
1962 | * Actions for interface - statemachine. | ||
1963 | *****************************************************************************/ | ||
1964 | |||
1965 | /** | ||
1966 | * Startup channels by sending CH_EVENT_START to each channel. | ||
1967 | * | ||
1968 | * @param fi An instance of an interface statemachine. | ||
1969 | * @param event The event, just happened. | ||
1970 | * @param arg Generic pointer, casted from struct net_device * upon call. | ||
1971 | */ | ||
1972 | static void | ||
1973 | dev_action_start(fsm_instance * fi, int event, void *arg) | ||
1974 | { | ||
1975 | struct net_device *dev = (struct net_device *) arg; | ||
1976 | struct ctc_priv *privptr = dev->priv; | ||
1977 | int direction; | ||
1978 | |||
1979 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
1980 | fsm_deltimer(&privptr->restart_timer); | ||
1981 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); | ||
1982 | for (direction = READ; direction <= WRITE; direction++) { | ||
1983 | struct channel *ch = privptr->channel[direction]; | ||
1984 | fsm_event(ch->fsm, CH_EVENT_START, ch); | ||
1985 | } | ||
1986 | } | ||
1987 | |||
1988 | /** | ||
1989 | * Shutdown channels by sending CH_EVENT_STOP to each channel. | ||
1990 | * | ||
1991 | * @param fi An instance of an interface statemachine. | ||
1992 | * @param event The event, just happened. | ||
1993 | * @param arg Generic pointer, casted from struct net_device * upon call. | ||
1994 | */ | ||
1995 | static void | ||
1996 | dev_action_stop(fsm_instance * fi, int event, void *arg) | ||
1997 | { | ||
1998 | struct net_device *dev = (struct net_device *) arg; | ||
1999 | struct ctc_priv *privptr = dev->priv; | ||
2000 | int direction; | ||
2001 | |||
2002 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2003 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); | ||
2004 | for (direction = READ; direction <= WRITE; direction++) { | ||
2005 | struct channel *ch = privptr->channel[direction]; | ||
2006 | fsm_event(ch->fsm, CH_EVENT_STOP, ch); | ||
2007 | } | ||
2008 | } | ||
2009 | static void | ||
2010 | dev_action_restart(fsm_instance *fi, int event, void *arg) | ||
2011 | { | ||
2012 | struct net_device *dev = (struct net_device *)arg; | ||
2013 | struct ctc_priv *privptr = dev->priv; | ||
2014 | |||
2015 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2016 | ctc_pr_debug("%s: Restarting\n", dev->name); | ||
2017 | dev_action_stop(fi, event, arg); | ||
2018 | fsm_event(privptr->fsm, DEV_EVENT_STOP, dev); | ||
2019 | fsm_addtimer(&privptr->restart_timer, CTC_TIMEOUT_5SEC, | ||
2020 | DEV_EVENT_START, dev); | ||
2021 | } | ||
2022 | |||
2023 | /** | ||
2024 | * Called from channel statemachine | ||
2025 | * when a channel is up and running. | ||
2026 | * | ||
2027 | * @param fi An instance of an interface statemachine. | ||
2028 | * @param event The event, just happened. | ||
2029 | * @param arg Generic pointer, casted from struct net_device * upon call. | ||
2030 | */ | ||
2031 | static void | ||
2032 | dev_action_chup(fsm_instance * fi, int event, void *arg) | ||
2033 | { | ||
2034 | struct net_device *dev = (struct net_device *) arg; | ||
2035 | |||
2036 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2037 | switch (fsm_getstate(fi)) { | ||
2038 | case DEV_STATE_STARTWAIT_RXTX: | ||
2039 | if (event == DEV_EVENT_RXUP) | ||
2040 | fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); | ||
2041 | else | ||
2042 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); | ||
2043 | break; | ||
2044 | case DEV_STATE_STARTWAIT_RX: | ||
2045 | if (event == DEV_EVENT_RXUP) { | ||
2046 | fsm_newstate(fi, DEV_STATE_RUNNING); | ||
2047 | ctc_pr_info("%s: connected with remote side\n", | ||
2048 | dev->name); | ||
2049 | ctc_clear_busy(dev); | ||
2050 | } | ||
2051 | break; | ||
2052 | case DEV_STATE_STARTWAIT_TX: | ||
2053 | if (event == DEV_EVENT_TXUP) { | ||
2054 | fsm_newstate(fi, DEV_STATE_RUNNING); | ||
2055 | ctc_pr_info("%s: connected with remote side\n", | ||
2056 | dev->name); | ||
2057 | ctc_clear_busy(dev); | ||
2058 | } | ||
2059 | break; | ||
2060 | case DEV_STATE_STOPWAIT_TX: | ||
2061 | if (event == DEV_EVENT_RXUP) | ||
2062 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); | ||
2063 | break; | ||
2064 | case DEV_STATE_STOPWAIT_RX: | ||
2065 | if (event == DEV_EVENT_TXUP) | ||
2066 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RXTX); | ||
2067 | break; | ||
2068 | } | ||
2069 | } | ||
2070 | |||
2071 | /** | ||
2072 | * Called from channel statemachine | ||
2073 | * when a channel has been shutdown. | ||
2074 | * | ||
2075 | * @param fi An instance of an interface statemachine. | ||
2076 | * @param event The event, just happened. | ||
2077 | * @param arg Generic pointer, casted from struct net_device * upon call. | ||
2078 | */ | ||
2079 | static void | ||
2080 | dev_action_chdown(fsm_instance * fi, int event, void *arg) | ||
2081 | { | ||
2082 | |||
2083 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2084 | switch (fsm_getstate(fi)) { | ||
2085 | case DEV_STATE_RUNNING: | ||
2086 | if (event == DEV_EVENT_TXDOWN) | ||
2087 | fsm_newstate(fi, DEV_STATE_STARTWAIT_TX); | ||
2088 | else | ||
2089 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RX); | ||
2090 | break; | ||
2091 | case DEV_STATE_STARTWAIT_RX: | ||
2092 | if (event == DEV_EVENT_TXDOWN) | ||
2093 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); | ||
2094 | break; | ||
2095 | case DEV_STATE_STARTWAIT_TX: | ||
2096 | if (event == DEV_EVENT_RXDOWN) | ||
2097 | fsm_newstate(fi, DEV_STATE_STARTWAIT_RXTX); | ||
2098 | break; | ||
2099 | case DEV_STATE_STOPWAIT_RXTX: | ||
2100 | if (event == DEV_EVENT_TXDOWN) | ||
2101 | fsm_newstate(fi, DEV_STATE_STOPWAIT_RX); | ||
2102 | else | ||
2103 | fsm_newstate(fi, DEV_STATE_STOPWAIT_TX); | ||
2104 | break; | ||
2105 | case DEV_STATE_STOPWAIT_RX: | ||
2106 | if (event == DEV_EVENT_RXDOWN) | ||
2107 | fsm_newstate(fi, DEV_STATE_STOPPED); | ||
2108 | break; | ||
2109 | case DEV_STATE_STOPWAIT_TX: | ||
2110 | if (event == DEV_EVENT_TXDOWN) | ||
2111 | fsm_newstate(fi, DEV_STATE_STOPPED); | ||
2112 | break; | ||
2113 | } | ||
2114 | } | ||
2115 | |||
2116 | static const fsm_node dev_fsm[] = { | ||
2117 | {DEV_STATE_STOPPED, DEV_EVENT_START, dev_action_start}, | ||
2118 | |||
2119 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_START, dev_action_start }, | ||
2120 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, | ||
2121 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, | ||
2122 | {DEV_STATE_STOPWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2123 | |||
2124 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_START, dev_action_start }, | ||
2125 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, | ||
2126 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, | ||
2127 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RXDOWN, dev_action_chdown }, | ||
2128 | {DEV_STATE_STOPWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2129 | |||
2130 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_START, dev_action_start }, | ||
2131 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, | ||
2132 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, | ||
2133 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_TXDOWN, dev_action_chdown }, | ||
2134 | {DEV_STATE_STOPWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2135 | |||
2136 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_STOP, dev_action_stop }, | ||
2137 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXUP, dev_action_chup }, | ||
2138 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXUP, dev_action_chup }, | ||
2139 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RXDOWN, dev_action_chdown }, | ||
2140 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_TXDOWN, dev_action_chdown }, | ||
2141 | {DEV_STATE_STARTWAIT_RXTX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2142 | |||
2143 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_STOP, dev_action_stop }, | ||
2144 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXUP, dev_action_chup }, | ||
2145 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_TXUP, dev_action_chup }, | ||
2146 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RXDOWN, dev_action_chdown }, | ||
2147 | {DEV_STATE_STARTWAIT_TX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2148 | |||
2149 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_STOP, dev_action_stop }, | ||
2150 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RXUP, dev_action_chup }, | ||
2151 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXUP, dev_action_chup }, | ||
2152 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_TXDOWN, dev_action_chdown }, | ||
2153 | {DEV_STATE_STARTWAIT_RX, DEV_EVENT_RESTART, dev_action_restart }, | ||
2154 | |||
2155 | {DEV_STATE_RUNNING, DEV_EVENT_STOP, dev_action_stop }, | ||
2156 | {DEV_STATE_RUNNING, DEV_EVENT_RXDOWN, dev_action_chdown }, | ||
2157 | {DEV_STATE_RUNNING, DEV_EVENT_TXDOWN, dev_action_chdown }, | ||
2158 | {DEV_STATE_RUNNING, DEV_EVENT_TXUP, fsm_action_nop }, | ||
2159 | {DEV_STATE_RUNNING, DEV_EVENT_RXUP, fsm_action_nop }, | ||
2160 | {DEV_STATE_RUNNING, DEV_EVENT_RESTART, dev_action_restart }, | ||
2161 | }; | ||
2162 | |||
2163 | static const int DEV_FSM_LEN = sizeof (dev_fsm) / sizeof (fsm_node); | ||
2164 | |||
2165 | /** | ||
2166 | * Transmit a packet. | ||
2167 | * This is a helper function for ctc_tx(). | ||
2168 | * | ||
2169 | * @param ch Channel to be used for sending. | ||
2170 | * @param skb Pointer to struct sk_buff of packet to send. | ||
2171 | * The linklevel header has already been set up | ||
2172 | * by ctc_tx(). | ||
2173 | * | ||
2174 | * @return 0 on success, -ERRNO on failure. (Never fails.) | ||
2175 | */ | ||
2176 | static int | ||
2177 | transmit_skb(struct channel *ch, struct sk_buff *skb) | ||
2178 | { | ||
2179 | unsigned long saveflags; | ||
2180 | struct ll_header header; | ||
2181 | int rc = 0; | ||
2182 | |||
2183 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
2184 | /* we need to acquire the lock for testing the state | ||
2185 | * otherwise we can have an IRQ changing the state to | ||
2186 | * TXIDLE after the test but before acquiring the lock. | ||
2187 | */ | ||
2188 | spin_lock_irqsave(&ch->collect_lock, saveflags); | ||
2189 | if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) { | ||
2190 | int l = skb->len + LL_HEADER_LENGTH; | ||
2191 | |||
2192 | if (ch->collect_len + l > ch->max_bufsize - 2) { | ||
2193 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | ||
2194 | return -EBUSY; | ||
2195 | } else { | ||
2196 | atomic_inc(&skb->users); | ||
2197 | header.length = l; | ||
2198 | header.type = skb->protocol; | ||
2199 | header.unused = 0; | ||
2200 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | ||
2201 | LL_HEADER_LENGTH); | ||
2202 | skb_queue_tail(&ch->collect_queue, skb); | ||
2203 | ch->collect_len += l; | ||
2204 | } | ||
2205 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | ||
2206 | } else { | ||
2207 | __u16 block_len; | ||
2208 | int ccw_idx; | ||
2209 | struct sk_buff *nskb; | ||
2210 | unsigned long hi; | ||
2211 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | ||
2212 | /** | ||
2213 | * Protect skb against beeing free'd by upper | ||
2214 | * layers. | ||
2215 | */ | ||
2216 | atomic_inc(&skb->users); | ||
2217 | ch->prof.txlen += skb->len; | ||
2218 | header.length = skb->len + LL_HEADER_LENGTH; | ||
2219 | header.type = skb->protocol; | ||
2220 | header.unused = 0; | ||
2221 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | ||
2222 | LL_HEADER_LENGTH); | ||
2223 | block_len = skb->len + 2; | ||
2224 | *((__u16 *) skb_push(skb, 2)) = block_len; | ||
2225 | |||
2226 | /** | ||
2227 | * IDAL support in CTC is broken, so we have to | ||
2228 | * care about skb's above 2G ourselves. | ||
2229 | */ | ||
2230 | hi = ((unsigned long)skb_tail_pointer(skb) + | ||
2231 | LL_HEADER_LENGTH) >> 31; | ||
2232 | if (hi) { | ||
2233 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | ||
2234 | if (!nskb) { | ||
2235 | atomic_dec(&skb->users); | ||
2236 | skb_pull(skb, LL_HEADER_LENGTH + 2); | ||
2237 | ctc_clear_busy(ch->netdev); | ||
2238 | return -ENOMEM; | ||
2239 | } else { | ||
2240 | memcpy(skb_put(nskb, skb->len), | ||
2241 | skb->data, skb->len); | ||
2242 | atomic_inc(&nskb->users); | ||
2243 | atomic_dec(&skb->users); | ||
2244 | dev_kfree_skb_irq(skb); | ||
2245 | skb = nskb; | ||
2246 | } | ||
2247 | } | ||
2248 | |||
2249 | ch->ccw[4].count = block_len; | ||
2250 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | ||
2251 | /** | ||
2252 | * idal allocation failed, try via copying to | ||
2253 | * trans_skb. trans_skb usually has a pre-allocated | ||
2254 | * idal. | ||
2255 | */ | ||
2256 | if (ctc_checkalloc_buffer(ch, 1)) { | ||
2257 | /** | ||
2258 | * Remove our header. It gets added | ||
2259 | * again on retransmit. | ||
2260 | */ | ||
2261 | atomic_dec(&skb->users); | ||
2262 | skb_pull(skb, LL_HEADER_LENGTH + 2); | ||
2263 | ctc_clear_busy(ch->netdev); | ||
2264 | return -EBUSY; | ||
2265 | } | ||
2266 | |||
2267 | skb_reset_tail_pointer(ch->trans_skb); | ||
2268 | ch->trans_skb->len = 0; | ||
2269 | ch->ccw[1].count = skb->len; | ||
2270 | skb_copy_from_linear_data(skb, skb_put(ch->trans_skb, | ||
2271 | skb->len), | ||
2272 | skb->len); | ||
2273 | atomic_dec(&skb->users); | ||
2274 | dev_kfree_skb_irq(skb); | ||
2275 | ccw_idx = 0; | ||
2276 | } else { | ||
2277 | skb_queue_tail(&ch->io_queue, skb); | ||
2278 | ccw_idx = 3; | ||
2279 | } | ||
2280 | ch->retry = 0; | ||
2281 | fsm_newstate(ch->fsm, CH_STATE_TX); | ||
2282 | fsm_addtimer(&ch->timer, CTC_TIMEOUT_5SEC, CH_EVENT_TIMER, ch); | ||
2283 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | ||
2284 | ch->prof.send_stamp = current_kernel_time(); | ||
2285 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | ||
2286 | (unsigned long) ch, 0xff, 0); | ||
2287 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | ||
2288 | if (ccw_idx == 3) | ||
2289 | ch->prof.doios_single++; | ||
2290 | if (rc != 0) { | ||
2291 | fsm_deltimer(&ch->timer); | ||
2292 | ccw_check_return_code(ch, rc, "single skb TX"); | ||
2293 | if (ccw_idx == 3) | ||
2294 | skb_dequeue_tail(&ch->io_queue); | ||
2295 | /** | ||
2296 | * Remove our header. It gets added | ||
2297 | * again on retransmit. | ||
2298 | */ | ||
2299 | skb_pull(skb, LL_HEADER_LENGTH + 2); | ||
2300 | } else { | ||
2301 | if (ccw_idx == 0) { | ||
2302 | struct net_device *dev = ch->netdev; | ||
2303 | struct ctc_priv *privptr = dev->priv; | ||
2304 | privptr->stats.tx_packets++; | ||
2305 | privptr->stats.tx_bytes += | ||
2306 | skb->len - LL_HEADER_LENGTH; | ||
2307 | } | ||
2308 | } | ||
2309 | } | ||
2310 | |||
2311 | ctc_clear_busy(ch->netdev); | ||
2312 | return rc; | ||
2313 | } | ||
2314 | |||
2315 | /** | ||
2316 | * Interface API for upper network layers | ||
2317 | *****************************************************************************/ | ||
2318 | |||
2319 | /** | ||
2320 | * Open an interface. | ||
2321 | * Called from generic network layer when ifconfig up is run. | ||
2322 | * | ||
2323 | * @param dev Pointer to interface struct. | ||
2324 | * | ||
2325 | * @return 0 on success, -ERRNO on failure. (Never fails.) | ||
2326 | */ | ||
2327 | static int | ||
2328 | ctc_open(struct net_device * dev) | ||
2329 | { | ||
2330 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
2331 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_START, dev); | ||
2332 | return 0; | ||
2333 | } | ||
2334 | |||
2335 | /** | ||
2336 | * Close an interface. | ||
2337 | * Called from generic network layer when ifconfig down is run. | ||
2338 | * | ||
2339 | * @param dev Pointer to interface struct. | ||
2340 | * | ||
2341 | * @return 0 on success, -ERRNO on failure. (Never fails.) | ||
2342 | */ | ||
2343 | static int | ||
2344 | ctc_close(struct net_device * dev) | ||
2345 | { | ||
2346 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
2347 | fsm_event(((struct ctc_priv *) dev->priv)->fsm, DEV_EVENT_STOP, dev); | ||
2348 | return 0; | ||
2349 | } | ||
2350 | |||
2351 | /** | ||
2352 | * Start transmission of a packet. | ||
2353 | * Called from generic network device layer. | ||
2354 | * | ||
2355 | * @param skb Pointer to buffer containing the packet. | ||
2356 | * @param dev Pointer to interface struct. | ||
2357 | * | ||
2358 | * @return 0 if packet consumed, !0 if packet rejected. | ||
2359 | * Note: If we return !0, then the packet is free'd by | ||
2360 | * the generic network layer. | ||
2361 | */ | ||
2362 | static int | ||
2363 | ctc_tx(struct sk_buff *skb, struct net_device * dev) | ||
2364 | { | ||
2365 | int rc = 0; | ||
2366 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; | ||
2367 | |||
2368 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
2369 | /** | ||
2370 | * Some sanity checks ... | ||
2371 | */ | ||
2372 | if (skb == NULL) { | ||
2373 | ctc_pr_warn("%s: NULL sk_buff passed\n", dev->name); | ||
2374 | privptr->stats.tx_dropped++; | ||
2375 | return 0; | ||
2376 | } | ||
2377 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { | ||
2378 | ctc_pr_warn("%s: Got sk_buff with head room < %ld bytes\n", | ||
2379 | dev->name, LL_HEADER_LENGTH + 2); | ||
2380 | dev_kfree_skb(skb); | ||
2381 | privptr->stats.tx_dropped++; | ||
2382 | return 0; | ||
2383 | } | ||
2384 | |||
2385 | /** | ||
2386 | * If channels are not running, try to restart them | ||
2387 | * and throw away packet. | ||
2388 | */ | ||
2389 | if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) { | ||
2390 | fsm_event(privptr->fsm, DEV_EVENT_START, dev); | ||
2391 | dev_kfree_skb(skb); | ||
2392 | privptr->stats.tx_dropped++; | ||
2393 | privptr->stats.tx_errors++; | ||
2394 | privptr->stats.tx_carrier_errors++; | ||
2395 | return 0; | ||
2396 | } | ||
2397 | |||
2398 | if (ctc_test_and_set_busy(dev)) | ||
2399 | return -EBUSY; | ||
2400 | |||
2401 | dev->trans_start = jiffies; | ||
2402 | if (transmit_skb(privptr->channel[WRITE], skb) != 0) | ||
2403 | rc = 1; | ||
2404 | return rc; | ||
2405 | } | ||
2406 | |||
2407 | /** | ||
2408 | * Sets MTU of an interface. | ||
2409 | * | ||
2410 | * @param dev Pointer to interface struct. | ||
2411 | * @param new_mtu The new MTU to use for this interface. | ||
2412 | * | ||
2413 | * @return 0 on success, -EINVAL if MTU is out of valid range. | ||
2414 | * (valid range is 576 .. 65527). If VM is on the | ||
2415 | * remote side, maximum MTU is 32760, however this is | ||
2416 | * <em>not</em> checked here. | ||
2417 | */ | ||
2418 | static int | ||
2419 | ctc_change_mtu(struct net_device * dev, int new_mtu) | ||
2420 | { | ||
2421 | struct ctc_priv *privptr = (struct ctc_priv *) dev->priv; | ||
2422 | |||
2423 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2424 | if ((new_mtu < 576) || (new_mtu > 65527) || | ||
2425 | (new_mtu > (privptr->channel[READ]->max_bufsize - | ||
2426 | LL_HEADER_LENGTH - 2))) | ||
2427 | return -EINVAL; | ||
2428 | dev->mtu = new_mtu; | ||
2429 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | ||
2430 | return 0; | ||
2431 | } | ||
2432 | |||
2433 | /** | ||
2434 | * Returns interface statistics of a device. | ||
2435 | * | ||
2436 | * @param dev Pointer to interface struct. | ||
2437 | * | ||
2438 | * @return Pointer to stats struct of this interface. | ||
2439 | */ | ||
2440 | static struct net_device_stats * | ||
2441 | ctc_stats(struct net_device * dev) | ||
2442 | { | ||
2443 | return &((struct ctc_priv *) dev->priv)->stats; | ||
2444 | } | ||
2445 | |||
2446 | /* | ||
2447 | * sysfs attributes | ||
2448 | */ | ||
2449 | |||
2450 | static ssize_t | ||
2451 | buffer_show(struct device *dev, struct device_attribute *attr, char *buf) | ||
2452 | { | ||
2453 | struct ctc_priv *priv; | ||
2454 | |||
2455 | priv = dev->driver_data; | ||
2456 | if (!priv) | ||
2457 | return -ENODEV; | ||
2458 | return sprintf(buf, "%d\n", | ||
2459 | priv->buffer_size); | ||
2460 | } | ||
2461 | |||
2462 | static ssize_t | ||
2463 | buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
2464 | { | ||
2465 | struct ctc_priv *priv; | ||
2466 | struct net_device *ndev; | ||
2467 | int bs1; | ||
2468 | char buffer[16]; | ||
2469 | |||
2470 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2471 | DBF_TEXT(trace, 3, buf); | ||
2472 | priv = dev->driver_data; | ||
2473 | if (!priv) { | ||
2474 | DBF_TEXT(trace, 3, "bfnopriv"); | ||
2475 | return -ENODEV; | ||
2476 | } | ||
2477 | |||
2478 | sscanf(buf, "%u", &bs1); | ||
2479 | if (bs1 > CTC_BUFSIZE_LIMIT) | ||
2480 | goto einval; | ||
2481 | if (bs1 < (576 + LL_HEADER_LENGTH + 2)) | ||
2482 | goto einval; | ||
2483 | priv->buffer_size = bs1; // just to overwrite the default | ||
2484 | |||
2485 | ndev = priv->channel[READ]->netdev; | ||
2486 | if (!ndev) { | ||
2487 | DBF_TEXT(trace, 3, "bfnondev"); | ||
2488 | return -ENODEV; | ||
2489 | } | ||
2490 | |||
2491 | if ((ndev->flags & IFF_RUNNING) && | ||
2492 | (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2))) | ||
2493 | goto einval; | ||
2494 | |||
2495 | priv->channel[READ]->max_bufsize = bs1; | ||
2496 | priv->channel[WRITE]->max_bufsize = bs1; | ||
2497 | if (!(ndev->flags & IFF_RUNNING)) | ||
2498 | ndev->mtu = bs1 - LL_HEADER_LENGTH - 2; | ||
2499 | priv->channel[READ]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; | ||
2500 | priv->channel[WRITE]->flags |= CHANNEL_FLAGS_BUFSIZE_CHANGED; | ||
2501 | |||
2502 | sprintf(buffer, "%d",priv->buffer_size); | ||
2503 | DBF_TEXT(trace, 3, buffer); | ||
2504 | return count; | ||
2505 | |||
2506 | einval: | ||
2507 | DBF_TEXT(trace, 3, "buff_err"); | ||
2508 | return -EINVAL; | ||
2509 | } | ||
2510 | |||
2511 | static ssize_t | ||
2512 | loglevel_show(struct device *dev, struct device_attribute *attr, char *buf) | ||
2513 | { | ||
2514 | return sprintf(buf, "%d\n", loglevel); | ||
2515 | } | ||
2516 | |||
2517 | static ssize_t | ||
2518 | loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
2519 | { | ||
2520 | int ll1; | ||
2521 | |||
2522 | DBF_TEXT(trace, 5, __FUNCTION__); | ||
2523 | sscanf(buf, "%i", &ll1); | ||
2524 | |||
2525 | if ((ll1 > CTC_LOGLEVEL_MAX) || (ll1 < 0)) | ||
2526 | return -EINVAL; | ||
2527 | loglevel = ll1; | ||
2528 | return count; | ||
2529 | } | ||
2530 | |||
2531 | static void | ||
2532 | ctc_print_statistics(struct ctc_priv *priv) | ||
2533 | { | ||
2534 | char *sbuf; | ||
2535 | char *p; | ||
2536 | |||
2537 | DBF_TEXT(trace, 4, __FUNCTION__); | ||
2538 | if (!priv) | ||
2539 | return; | ||
2540 | sbuf = kmalloc(2048, GFP_KERNEL); | ||
2541 | if (sbuf == NULL) | ||
2542 | return; | ||
2543 | p = sbuf; | ||
2544 | |||
2545 | p += sprintf(p, " Device FSM state: %s\n", | ||
2546 | fsm_getstate_str(priv->fsm)); | ||
2547 | p += sprintf(p, " RX channel FSM state: %s\n", | ||
2548 | fsm_getstate_str(priv->channel[READ]->fsm)); | ||
2549 | p += sprintf(p, " TX channel FSM state: %s\n", | ||
2550 | fsm_getstate_str(priv->channel[WRITE]->fsm)); | ||
2551 | p += sprintf(p, " Max. TX buffer used: %ld\n", | ||
2552 | priv->channel[WRITE]->prof.maxmulti); | ||
2553 | p += sprintf(p, " Max. chained SKBs: %ld\n", | ||
2554 | priv->channel[WRITE]->prof.maxcqueue); | ||
2555 | p += sprintf(p, " TX single write ops: %ld\n", | ||
2556 | priv->channel[WRITE]->prof.doios_single); | ||
2557 | p += sprintf(p, " TX multi write ops: %ld\n", | ||
2558 | priv->channel[WRITE]->prof.doios_multi); | ||
2559 | p += sprintf(p, " Netto bytes written: %ld\n", | ||
2560 | priv->channel[WRITE]->prof.txlen); | ||
2561 | p += sprintf(p, " Max. TX IO-time: %ld\n", | ||
2562 | priv->channel[WRITE]->prof.tx_time); | ||
2563 | |||
2564 | ctc_pr_debug("Statistics for %s:\n%s", | ||
2565 | priv->channel[WRITE]->netdev->name, sbuf); | ||
2566 | kfree(sbuf); | ||
2567 | return; | ||
2568 | } | ||
2569 | |||
2570 | static ssize_t | ||
2571 | stats_show(struct device *dev, struct device_attribute *attr, char *buf) | ||
2572 | { | ||
2573 | struct ctc_priv *priv = dev->driver_data; | ||
2574 | if (!priv) | ||
2575 | return -ENODEV; | ||
2576 | ctc_print_statistics(priv); | ||
2577 | return sprintf(buf, "0\n"); | ||
2578 | } | ||
2579 | |||
2580 | static ssize_t | ||
2581 | stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
2582 | { | ||
2583 | struct ctc_priv *priv = dev->driver_data; | ||
2584 | if (!priv) | ||
2585 | return -ENODEV; | ||
2586 | /* Reset statistics */ | ||
2587 | memset(&priv->channel[WRITE]->prof, 0, | ||
2588 | sizeof(priv->channel[WRITE]->prof)); | ||
2589 | return count; | ||
2590 | } | ||
2591 | |||
2592 | static void | ||
2593 | ctc_netdev_unregister(struct net_device * dev) | ||
2594 | { | ||
2595 | struct ctc_priv *privptr; | ||
2596 | |||
2597 | if (!dev) | ||
2598 | return; | ||
2599 | privptr = (struct ctc_priv *) dev->priv; | ||
2600 | unregister_netdev(dev); | ||
2601 | } | ||
2602 | |||
2603 | static int | ||
2604 | ctc_netdev_register(struct net_device * dev) | ||
2605 | { | ||
2606 | return register_netdev(dev); | ||
2607 | } | ||
2608 | |||
2609 | static void | ||
2610 | ctc_free_netdevice(struct net_device * dev, int free_dev) | ||
2611 | { | ||
2612 | struct ctc_priv *privptr; | ||
2613 | if (!dev) | ||
2614 | return; | ||
2615 | privptr = dev->priv; | ||
2616 | if (privptr) { | ||
2617 | if (privptr->fsm) | ||
2618 | kfree_fsm(privptr->fsm); | ||
2619 | kfree(privptr); | ||
2620 | } | ||
2621 | #ifdef MODULE | ||
2622 | if (free_dev) | ||
2623 | free_netdev(dev); | ||
2624 | #endif | ||
2625 | } | ||
2626 | |||
2627 | static ssize_t | ||
2628 | ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf) | ||
2629 | { | ||
2630 | struct ctc_priv *priv; | ||
2631 | |||
2632 | priv = dev->driver_data; | ||
2633 | if (!priv) | ||
2634 | return -ENODEV; | ||
2635 | |||
2636 | return sprintf(buf, "%d\n", priv->protocol); | ||
2637 | } | ||
2638 | |||
2639 | static ssize_t | ||
2640 | ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) | ||
2641 | { | ||
2642 | struct ctc_priv *priv; | ||
2643 | int value; | ||
2644 | |||
2645 | DBF_TEXT(trace, 3, __FUNCTION__); | ||
2646 | pr_debug("%s() called\n", __FUNCTION__); | ||
2647 | |||
2648 | priv = dev->driver_data; | ||
2649 | if (!priv) | ||
2650 | return -ENODEV; | ||
2651 | sscanf(buf, "%u", &value); | ||
2652 | if (!((value == CTC_PROTO_S390) || | ||
2653 | (value == CTC_PROTO_LINUX) || | ||
2654 | (value == CTC_PROTO_OS390))) | ||
2655 | return -EINVAL; | ||
2656 | priv->protocol = value; | ||
2657 | |||
2658 | return count; | ||
2659 | } | ||
2660 | |||
2661 | static ssize_t | ||
2662 | ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf) | ||
2663 | { | ||
2664 | struct ccwgroup_device *cgdev; | ||
2665 | |||
2666 | cgdev = to_ccwgroupdev(dev); | ||
2667 | if (!cgdev) | ||
2668 | return -ENODEV; | ||
2669 | |||
2670 | return sprintf(buf, "%s\n", cu3088_type[cgdev->cdev[0]->id.driver_info]); | ||
2671 | } | ||
2672 | |||
2673 | static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write); | ||
2674 | static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store); | ||
2675 | static DEVICE_ATTR(type, 0444, ctc_type_show, NULL); | ||
2676 | |||
2677 | static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write); | ||
2678 | static DEVICE_ATTR(stats, 0644, stats_show, stats_write); | ||
2679 | |||
2680 | static struct attribute *ctc_attr[] = { | ||
2681 | &dev_attr_protocol.attr, | ||
2682 | &dev_attr_type.attr, | ||
2683 | &dev_attr_buffer.attr, | ||
2684 | NULL, | ||
2685 | }; | ||
2686 | |||
2687 | static struct attribute_group ctc_attr_group = { | ||
2688 | .attrs = ctc_attr, | ||
2689 | }; | ||
2690 | |||
2691 | static int | ||
2692 | ctc_add_attributes(struct device *dev) | ||
2693 | { | ||
2694 | int rc; | ||
2695 | |||
2696 | rc = device_create_file(dev, &dev_attr_loglevel); | ||
2697 | if (rc) | ||
2698 | goto out; | ||
2699 | rc = device_create_file(dev, &dev_attr_stats); | ||
2700 | if (!rc) | ||
2701 | goto out; | ||
2702 | device_remove_file(dev, &dev_attr_loglevel); | ||
2703 | out: | ||
2704 | return rc; | ||
2705 | } | ||
2706 | |||
2707 | static void | ||
2708 | ctc_remove_attributes(struct device *dev) | ||
2709 | { | ||
2710 | device_remove_file(dev, &dev_attr_stats); | ||
2711 | device_remove_file(dev, &dev_attr_loglevel); | ||
2712 | } | ||
2713 | |||
2714 | static int | ||
2715 | ctc_add_files(struct device *dev) | ||
2716 | { | ||
2717 | pr_debug("%s() called\n", __FUNCTION__); | ||
2718 | |||
2719 | return sysfs_create_group(&dev->kobj, &ctc_attr_group); | ||
2720 | } | ||
2721 | |||
2722 | static void | ||
2723 | ctc_remove_files(struct device *dev) | ||
2724 | { | ||
2725 | pr_debug("%s() called\n", __FUNCTION__); | ||
2726 | |||
2727 | sysfs_remove_group(&dev->kobj, &ctc_attr_group); | ||
2728 | } | ||
2729 | |||
2730 | /** | ||
2731 | * Add ctc specific attributes. | ||
2732 | * Add ctc private data. | ||
2733 | * | ||
2734 | * @param cgdev pointer to ccwgroup_device just added | ||
2735 | * | ||
2736 | * @returns 0 on success, !0 on failure. | ||
2737 | */ | ||
2738 | static int | ||
2739 | ctc_probe_device(struct ccwgroup_device *cgdev) | ||
2740 | { | ||
2741 | struct ctc_priv *priv; | ||
2742 | int rc; | ||
2743 | char buffer[16]; | ||
2744 | |||
2745 | pr_debug("%s() called\n", __FUNCTION__); | ||
2746 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
2747 | |||
2748 | if (!get_device(&cgdev->dev)) | ||
2749 | return -ENODEV; | ||
2750 | |||
2751 | priv = kzalloc(sizeof(struct ctc_priv), GFP_KERNEL); | ||
2752 | if (!priv) { | ||
2753 | ctc_pr_err("%s: Out of memory\n", __func__); | ||
2754 | put_device(&cgdev->dev); | ||
2755 | return -ENOMEM; | ||
2756 | } | ||
2757 | |||
2758 | rc = ctc_add_files(&cgdev->dev); | ||
2759 | if (rc) { | ||
2760 | kfree(priv); | ||
2761 | put_device(&cgdev->dev); | ||
2762 | return rc; | ||
2763 | } | ||
2764 | priv->buffer_size = CTC_BUFSIZE_DEFAULT; | ||
2765 | cgdev->cdev[0]->handler = ctc_irq_handler; | ||
2766 | cgdev->cdev[1]->handler = ctc_irq_handler; | ||
2767 | cgdev->dev.driver_data = priv; | ||
2768 | |||
2769 | sprintf(buffer, "%p", priv); | ||
2770 | DBF_TEXT(data, 3, buffer); | ||
2771 | |||
2772 | sprintf(buffer, "%u", (unsigned int)sizeof(struct ctc_priv)); | ||
2773 | DBF_TEXT(data, 3, buffer); | ||
2774 | |||
2775 | sprintf(buffer, "%p", &channels); | ||
2776 | DBF_TEXT(data, 3, buffer); | ||
2777 | |||
2778 | sprintf(buffer, "%u", (unsigned int)sizeof(struct channel)); | ||
2779 | DBF_TEXT(data, 3, buffer); | ||
2780 | |||
2781 | return 0; | ||
2782 | } | ||
2783 | |||
2784 | /** | ||
2785 | * Device setup function called by alloc_netdev(). | ||
2786 | * | ||
2787 | * @param dev Device to be setup. | ||
2788 | */ | ||
2789 | void ctc_init_netdevice(struct net_device * dev) | ||
2790 | { | ||
2791 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
2792 | |||
2793 | if (dev->mtu == 0) | ||
2794 | dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | ||
2795 | dev->hard_start_xmit = ctc_tx; | ||
2796 | dev->open = ctc_open; | ||
2797 | dev->stop = ctc_close; | ||
2798 | dev->get_stats = ctc_stats; | ||
2799 | dev->change_mtu = ctc_change_mtu; | ||
2800 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | ||
2801 | dev->addr_len = 0; | ||
2802 | dev->type = ARPHRD_SLIP; | ||
2803 | dev->tx_queue_len = 100; | ||
2804 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | ||
2805 | } | ||
2806 | |||
2807 | |||
2808 | /** | ||
2809 | * | ||
2810 | * Setup an interface. | ||
2811 | * | ||
2812 | * @param cgdev Device to be setup. | ||
2813 | * | ||
2814 | * @returns 0 on success, !0 on failure. | ||
2815 | */ | ||
2816 | static int | ||
2817 | ctc_new_device(struct ccwgroup_device *cgdev) | ||
2818 | { | ||
2819 | char read_id[CTC_ID_SIZE]; | ||
2820 | char write_id[CTC_ID_SIZE]; | ||
2821 | int direction; | ||
2822 | enum channel_types type; | ||
2823 | struct ctc_priv *privptr; | ||
2824 | struct net_device *dev; | ||
2825 | int ret; | ||
2826 | char buffer[16]; | ||
2827 | |||
2828 | pr_debug("%s() called\n", __FUNCTION__); | ||
2829 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
2830 | |||
2831 | privptr = cgdev->dev.driver_data; | ||
2832 | if (!privptr) | ||
2833 | return -ENODEV; | ||
2834 | |||
2835 | sprintf(buffer, "%d", privptr->buffer_size); | ||
2836 | DBF_TEXT(setup, 3, buffer); | ||
2837 | |||
2838 | type = get_channel_type(&cgdev->cdev[0]->id); | ||
2839 | |||
2840 | snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id); | ||
2841 | snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id); | ||
2842 | |||
2843 | if (add_channel(cgdev->cdev[0], type)) | ||
2844 | return -ENOMEM; | ||
2845 | if (add_channel(cgdev->cdev[1], type)) | ||
2846 | return -ENOMEM; | ||
2847 | |||
2848 | ret = ccw_device_set_online(cgdev->cdev[0]); | ||
2849 | if (ret != 0) { | ||
2850 | printk(KERN_WARNING | ||
2851 | "ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret); | ||
2852 | } | ||
2853 | |||
2854 | ret = ccw_device_set_online(cgdev->cdev[1]); | ||
2855 | if (ret != 0) { | ||
2856 | printk(KERN_WARNING | ||
2857 | "ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret); | ||
2858 | } | ||
2859 | |||
2860 | dev = alloc_netdev(0, "ctc%d", ctc_init_netdevice); | ||
2861 | if (!dev) { | ||
2862 | ctc_pr_warn("ctc_init_netdevice failed\n"); | ||
2863 | goto out; | ||
2864 | } | ||
2865 | dev->priv = privptr; | ||
2866 | |||
2867 | privptr->fsm = init_fsm("ctcdev", dev_state_names, | ||
2868 | dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS, | ||
2869 | dev_fsm, DEV_FSM_LEN, GFP_KERNEL); | ||
2870 | if (privptr->fsm == NULL) { | ||
2871 | free_netdev(dev); | ||
2872 | goto out; | ||
2873 | } | ||
2874 | fsm_newstate(privptr->fsm, DEV_STATE_STOPPED); | ||
2875 | fsm_settimer(privptr->fsm, &privptr->restart_timer); | ||
2876 | |||
2877 | for (direction = READ; direction <= WRITE; direction++) { | ||
2878 | privptr->channel[direction] = | ||
2879 | channel_get(type, direction == READ ? read_id : write_id, | ||
2880 | direction); | ||
2881 | if (privptr->channel[direction] == NULL) { | ||
2882 | if (direction == WRITE) | ||
2883 | channel_free(privptr->channel[READ]); | ||
2884 | |||
2885 | ctc_free_netdevice(dev, 1); | ||
2886 | goto out; | ||
2887 | } | ||
2888 | privptr->channel[direction]->netdev = dev; | ||
2889 | privptr->channel[direction]->protocol = privptr->protocol; | ||
2890 | privptr->channel[direction]->max_bufsize = privptr->buffer_size; | ||
2891 | } | ||
2892 | /* sysfs magic */ | ||
2893 | SET_NETDEV_DEV(dev, &cgdev->dev); | ||
2894 | |||
2895 | if (ctc_netdev_register(dev) != 0) { | ||
2896 | ctc_free_netdevice(dev, 1); | ||
2897 | goto out; | ||
2898 | } | ||
2899 | |||
2900 | if (ctc_add_attributes(&cgdev->dev)) { | ||
2901 | ctc_netdev_unregister(dev); | ||
2902 | dev->priv = NULL; | ||
2903 | ctc_free_netdevice(dev, 1); | ||
2904 | goto out; | ||
2905 | } | ||
2906 | |||
2907 | strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name)); | ||
2908 | |||
2909 | print_banner(); | ||
2910 | |||
2911 | ctc_pr_info("%s: read: %s, write: %s, proto: %d\n", | ||
2912 | dev->name, privptr->channel[READ]->id, | ||
2913 | privptr->channel[WRITE]->id, privptr->protocol); | ||
2914 | |||
2915 | return 0; | ||
2916 | out: | ||
2917 | ccw_device_set_offline(cgdev->cdev[1]); | ||
2918 | ccw_device_set_offline(cgdev->cdev[0]); | ||
2919 | |||
2920 | return -ENODEV; | ||
2921 | } | ||
2922 | |||
2923 | /** | ||
2924 | * Shutdown an interface. | ||
2925 | * | ||
2926 | * @param cgdev Device to be shut down. | ||
2927 | * | ||
2928 | * @returns 0 on success, !0 on failure. | ||
2929 | */ | ||
2930 | static int | ||
2931 | ctc_shutdown_device(struct ccwgroup_device *cgdev) | ||
2932 | { | ||
2933 | struct ctc_priv *priv; | ||
2934 | struct net_device *ndev; | ||
2935 | |||
2936 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
2937 | pr_debug("%s() called\n", __FUNCTION__); | ||
2938 | |||
2939 | |||
2940 | priv = cgdev->dev.driver_data; | ||
2941 | ndev = NULL; | ||
2942 | if (!priv) | ||
2943 | return -ENODEV; | ||
2944 | |||
2945 | if (priv->channel[READ]) { | ||
2946 | ndev = priv->channel[READ]->netdev; | ||
2947 | |||
2948 | /* Close the device */ | ||
2949 | ctc_close(ndev); | ||
2950 | ndev->flags &=~IFF_RUNNING; | ||
2951 | |||
2952 | ctc_remove_attributes(&cgdev->dev); | ||
2953 | |||
2954 | channel_free(priv->channel[READ]); | ||
2955 | } | ||
2956 | if (priv->channel[WRITE]) | ||
2957 | channel_free(priv->channel[WRITE]); | ||
2958 | |||
2959 | if (ndev) { | ||
2960 | ctc_netdev_unregister(ndev); | ||
2961 | ndev->priv = NULL; | ||
2962 | ctc_free_netdevice(ndev, 1); | ||
2963 | } | ||
2964 | |||
2965 | if (priv->fsm) | ||
2966 | kfree_fsm(priv->fsm); | ||
2967 | |||
2968 | ccw_device_set_offline(cgdev->cdev[1]); | ||
2969 | ccw_device_set_offline(cgdev->cdev[0]); | ||
2970 | |||
2971 | if (priv->channel[READ]) | ||
2972 | channel_remove(priv->channel[READ]); | ||
2973 | if (priv->channel[WRITE]) | ||
2974 | channel_remove(priv->channel[WRITE]); | ||
2975 | priv->channel[READ] = priv->channel[WRITE] = NULL; | ||
2976 | |||
2977 | return 0; | ||
2978 | |||
2979 | } | ||
2980 | |||
2981 | static void | ||
2982 | ctc_remove_device(struct ccwgroup_device *cgdev) | ||
2983 | { | ||
2984 | struct ctc_priv *priv; | ||
2985 | |||
2986 | pr_debug("%s() called\n", __FUNCTION__); | ||
2987 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
2988 | |||
2989 | priv = cgdev->dev.driver_data; | ||
2990 | if (!priv) | ||
2991 | return; | ||
2992 | if (cgdev->state == CCWGROUP_ONLINE) | ||
2993 | ctc_shutdown_device(cgdev); | ||
2994 | ctc_remove_files(&cgdev->dev); | ||
2995 | cgdev->dev.driver_data = NULL; | ||
2996 | kfree(priv); | ||
2997 | put_device(&cgdev->dev); | ||
2998 | } | ||
2999 | |||
3000 | static struct ccwgroup_driver ctc_group_driver = { | ||
3001 | .owner = THIS_MODULE, | ||
3002 | .name = "ctc", | ||
3003 | .max_slaves = 2, | ||
3004 | .driver_id = 0xC3E3C3, | ||
3005 | .probe = ctc_probe_device, | ||
3006 | .remove = ctc_remove_device, | ||
3007 | .set_online = ctc_new_device, | ||
3008 | .set_offline = ctc_shutdown_device, | ||
3009 | }; | ||
3010 | |||
3011 | /** | ||
3012 | * Module related routines | ||
3013 | *****************************************************************************/ | ||
3014 | |||
3015 | /** | ||
3016 | * Prepare to be unloaded. Free IRQ's and release all resources. | ||
3017 | * This is called just before this module is unloaded. It is | ||
3018 | * <em>not</em> called, if the usage count is !0, so we don't need to check | ||
3019 | * for that. | ||
3020 | */ | ||
3021 | static void __exit | ||
3022 | ctc_exit(void) | ||
3023 | { | ||
3024 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
3025 | unregister_cu3088_discipline(&ctc_group_driver); | ||
3026 | ctc_unregister_dbf_views(); | ||
3027 | ctc_pr_info("CTC driver unloaded\n"); | ||
3028 | } | ||
3029 | |||
3030 | /** | ||
3031 | * Initialize module. | ||
3032 | * This is called just after the module is loaded. | ||
3033 | * | ||
3034 | * @return 0 on success, !0 on error. | ||
3035 | */ | ||
3036 | static int __init | ||
3037 | ctc_init(void) | ||
3038 | { | ||
3039 | int ret = 0; | ||
3040 | |||
3041 | loglevel = CTC_LOGLEVEL_DEFAULT; | ||
3042 | |||
3043 | DBF_TEXT(setup, 3, __FUNCTION__); | ||
3044 | |||
3045 | print_banner(); | ||
3046 | |||
3047 | ret = ctc_register_dbf_views(); | ||
3048 | if (ret){ | ||
3049 | ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret); | ||
3050 | return ret; | ||
3051 | } | ||
3052 | ret = register_cu3088_discipline(&ctc_group_driver); | ||
3053 | if (ret) { | ||
3054 | ctc_unregister_dbf_views(); | ||
3055 | } | ||
3056 | return ret; | ||
3057 | } | ||
3058 | |||
3059 | module_init(ctc_init); | ||
3060 | module_exit(ctc_exit); | ||
3061 | |||
3062 | /* --- This is the END my friend --- */ | ||