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1da177e4 | 1 | /* |
1da177e4 LT |
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) | |
96de0e25 | 6 | * Fixes by : Jochen Röhrig (roehrig@de.ibm.com) |
1da177e4 LT |
7 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br> |
8 | Peter Tiedemann (ptiedem@de.ibm.com) | |
56347a2e | 9 | * Driver Model stuff by : Cornelia Huck <cornelia.huck@de.ibm.com> |
1da177e4 LT |
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) | |
96de0e25 | 22 | * Jochen Röhrig (roehrig@de.ibm.com) |
1da177e4 LT |
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 | * | |
1da177e4 | 38 | */ |
1da177e4 | 39 | #undef DEBUG |
1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
1da177e4 LT |
67 | #include "fsm.h" |
68 | #include "cu3088.h" | |
7394c928 | 69 | |
1da177e4 | 70 | #include "ctcdbug.h" |
7394c928 | 71 | #include "ctcmain.h" |
1da177e4 LT |
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"); | |
1da177e4 LT |
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 | */ | |
7394c928 | 91 | CTC_NR_DEV_STATES |
1da177e4 LT |
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 | */ | |
7394c928 | 119 | CTC_NR_DEV_EVENTS |
1da177e4 LT |
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 | }; | |
e172577d | 131 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 | ||
7394c928 FP |
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; | |
7394c928 FP |
245 | |
246 | if (printed) | |
247 | return; | |
e018ba1f HC |
248 | |
249 | printk(KERN_INFO "CTC driver initialized\n"); | |
7394c928 FP |
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 | ||
1da177e4 LT |
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 | }; | |
e172577d | 319 | |
1da177e4 LT |
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 | */ | |
4d284cac | 371 | static void |
1da177e4 LT |
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); | |
459a98ed | 458 | skb_reset_mac_header(pskb); |
1da177e4 LT |
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 | } | |
d626f62b ACM |
475 | skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), |
476 | pskb->len); | |
459a98ed | 477 | skb_reset_mac_header(skb); |
1da177e4 LT |
478 | skb->dev = pskb->dev; |
479 | skb->protocol = pskb->protocol; | |
480 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
56347a2e | 481 | netif_rx_ni(skb); |
1da177e4 LT |
482 | /** |
483 | * Successful rx; reset logflags | |
484 | */ | |
485 | ch->logflags = 0; | |
486 | dev->last_rx = jiffies; | |
487 | privptr->stats.rx_packets++; | |
488 | privptr->stats.rx_bytes += skb->len; | |
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 | */ | |
4d284cac | 515 | static void |
1da177e4 LT |
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 | */ | |
4d284cac | 550 | static void |
1da177e4 LT |
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) { | |
56347a2e | 556 | ctc_pr_debug("%s: Interface disc. or Sel. reset " |
1da177e4 LT |
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 | ||
4d284cac | 606 | static int |
1da177e4 LT |
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 | } | |
e172577d | 653 | |
1da177e4 LT |
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; | |
2c6b47de | 677 | struct timespec done_stamp = current_kernel_time(); |
1da177e4 LT |
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 | } | |
27a884dc ACM |
710 | ch->trans_skb->data = ch->trans_skb_data; |
711 | skb_reset_tail_pointer(ch->trans_skb); | |
1da177e4 LT |
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))) { | |
d626f62b ACM |
720 | skb_copy_from_linear_data(skb, skb_put(ch->trans_skb, |
721 | skb->len), | |
722 | skb->len); | |
1da177e4 LT |
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); | |
2c6b47de | 733 | ch->prof.send_stamp = current_kernel_time(); |
1da177e4 LT |
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: | |
27a884dc ACM |
837 | skb->data = ch->trans_skb_data; |
838 | skb_reset_tail_pointer(skb); | |
1da177e4 LT |
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 | /** | |
96de0e25 | 888 | * Don't setup a timer for receiving the initial RX frame |
1da177e4 LT |
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 | /** | |
96de0e25 | 908 | * If in compatibility mode since we don't setup a timer, we |
1da177e4 LT |
909 | * also signal RX channel up immediately. This enables us |
910 | * to send packets early which in turn usually triggers some | |
96de0e25 | 911 | * reply from VM TCP which brings up the RX channel to it's |
1da177e4 LT |
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 | ||
e82b0f2c | 1487 | static void |
1da177e4 LT |
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; | |
e82b0f2c | 1493 | |
1da177e4 LT |
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 | ||
1da177e4 LT |
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); | |
e172577d | 1609 | |
1da177e4 LT |
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); | |
e82b0f2c | 1625 | |
1da177e4 LT |
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__); | |
b7127dfe AD |
1645 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
1646 | if (!ch) { | |
1da177e4 LT |
1647 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); |
1648 | return -1; | |
1649 | } | |
b7127dfe AD |
1650 | /* assure all flags and counters are reset */ |
1651 | ch->ccw = kzalloc(8 * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); | |
1652 | if (!ch->ccw) { | |
1da177e4 LT |
1653 | kfree(ch); |
1654 | ctc_pr_warn("ctc: Out of memory in add_channel\n"); | |
1655 | return -1; | |
1656 | } | |
1657 | ||
1da177e4 LT |
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; | |
1da177e4 LT |
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); | |
b7127dfe AD |
1697 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); |
1698 | if (!ch->irb) { | |
1da177e4 LT |
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 | } | |
1da177e4 LT |
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 | } | |
4c7ae6ea FP |
1717 | |
1718 | spin_lock_init(&ch->collect_lock); | |
1719 | ||
1da177e4 LT |
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 | } | |
e82b0f2c | 1896 | |
1da177e4 LT |
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 | } | |
e82b0f2c | 1910 | |
1da177e4 LT |
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 | } | |
e172577d | 1960 | |
1da177e4 LT |
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 | } | |
e82b0f2c | 2009 | static void |
1da177e4 LT |
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; | |
e82b0f2c | 2014 | |
1da177e4 LT |
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; | |
1da177e4 LT |
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); | |
1da177e4 LT |
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); | |
1da177e4 LT |
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 | { | |
1da177e4 LT |
2082 | |
2083 | DBF_TEXT(trace, 3, __FUNCTION__); | |
2084 | switch (fsm_getstate(fi)) { | |
2085 | case DEV_STATE_RUNNING: | |
1da177e4 LT |
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__); | |
e172577d | 2184 | /* we need to acquire the lock for testing the state |
e82b0f2c | 2185 | * otherwise we can have an IRQ changing the state to |
e172577d FP |
2186 | * TXIDLE after the test but before acquiring the lock. |
2187 | */ | |
2188 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
1da177e4 LT |
2189 | if (fsm_getstate(ch->fsm) != CH_STATE_TXIDLE) { |
2190 | int l = skb->len + LL_HEADER_LENGTH; | |
2191 | ||
e172577d FP |
2192 | if (ch->collect_len + l > ch->max_bufsize - 2) { |
2193 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
2194 | return -EBUSY; | |
2195 | } else { | |
1da177e4 LT |
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; | |
e172577d | 2211 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
1da177e4 LT |
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 | */ | |
27a884dc ACM |
2230 | hi = ((unsigned long)skb_tail_pointer(skb) + |
2231 | LL_HEADER_LENGTH) >> 31; | |
1da177e4 LT |
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); | |
e172577d | 2237 | ctc_clear_busy(ch->netdev); |
1da177e4 LT |
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); | |
e172577d | 2263 | ctc_clear_busy(ch->netdev); |
1da177e4 LT |
2264 | return -EBUSY; |
2265 | } | |
2266 | ||
27a884dc | 2267 | skb_reset_tail_pointer(ch->trans_skb); |
1da177e4 LT |
2268 | ch->trans_skb->len = 0; |
2269 | ch->ccw[1].count = skb->len; | |
d626f62b ACM |
2270 | skb_copy_from_linear_data(skb, skb_put(ch->trans_skb, |
2271 | skb->len), | |
2272 | skb->len); | |
1da177e4 LT |
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); | |
2c6b47de | 2284 | ch->prof.send_stamp = current_kernel_time(); |
1da177e4 LT |
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 | ||
e172577d | 2311 | ctc_clear_busy(ch->netdev); |
1da177e4 LT |
2312 | return rc; |
2313 | } | |
e172577d | 2314 | |
1da177e4 LT |
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 | |
e82b0f2c | 2387 | * and throw away packet. |
1da177e4 LT |
2388 | */ |
2389 | if (fsm_getstate(privptr->fsm) != DEV_STATE_RUNNING) { | |
2390 | fsm_event(privptr->fsm, DEV_EVENT_START, dev); | |
1da177e4 LT |
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; | |
1da177e4 LT |
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 | */ | |
7394c928 | 2449 | |
1da177e4 | 2450 | static ssize_t |
3fd3c0a5 | 2451 | buffer_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 2463 | buffer_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
2464 | { |
2465 | struct ctc_priv *priv; | |
2466 | struct net_device *ndev; | |
2467 | int bs1; | |
7394c928 | 2468 | char buffer[16]; |
1da177e4 LT |
2469 | |
2470 | DBF_TEXT(trace, 3, __FUNCTION__); | |
7394c928 | 2471 | DBF_TEXT(trace, 3, buf); |
1da177e4 | 2472 | priv = dev->driver_data; |
7394c928 FP |
2473 | if (!priv) { |
2474 | DBF_TEXT(trace, 3, "bfnopriv"); | |
1da177e4 | 2475 | return -ENODEV; |
7394c928 FP |
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 | ||
1da177e4 | 2485 | ndev = priv->channel[READ]->netdev; |
7394c928 FP |
2486 | if (!ndev) { |
2487 | DBF_TEXT(trace, 3, "bfnondev"); | |
1da177e4 | 2488 | return -ENODEV; |
7394c928 | 2489 | } |
1da177e4 | 2490 | |
1da177e4 LT |
2491 | if ((ndev->flags & IFF_RUNNING) && |
2492 | (bs1 < (ndev->mtu + LL_HEADER_LENGTH + 2))) | |
7394c928 | 2493 | goto einval; |
1da177e4 | 2494 | |
7394c928 FP |
2495 | priv->channel[READ]->max_bufsize = bs1; |
2496 | priv->channel[WRITE]->max_bufsize = bs1; | |
1da177e4 LT |
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 | ||
7394c928 FP |
2502 | sprintf(buffer, "%d",priv->buffer_size); |
2503 | DBF_TEXT(trace, 3, buffer); | |
1da177e4 LT |
2504 | return count; |
2505 | ||
7394c928 FP |
2506 | einval: |
2507 | DBF_TEXT(trace, 3, "buff_err"); | |
2508 | return -EINVAL; | |
1da177e4 LT |
2509 | } |
2510 | ||
2511 | static ssize_t | |
3fd3c0a5 | 2512 | loglevel_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 | 2513 | { |
1da177e4 LT |
2514 | return sprintf(buf, "%d\n", loglevel); |
2515 | } | |
2516 | ||
2517 | static ssize_t | |
3fd3c0a5 | 2518 | loglevel_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 | 2519 | { |
1da177e4 LT |
2520 | int ll1; |
2521 | ||
2522 | DBF_TEXT(trace, 5, __FUNCTION__); | |
1da177e4 LT |
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; | |
5cbded58 | 2540 | sbuf = kmalloc(2048, GFP_KERNEL); |
1da177e4 LT |
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 | |
3fd3c0a5 | 2571 | stats_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 2581 | stats_write(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
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 | ||
1da177e4 LT |
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; | |
56347a2e | 2600 | unregister_netdev(dev); |
1da177e4 LT |
2601 | } |
2602 | ||
2603 | static int | |
2604 | ctc_netdev_register(struct net_device * dev) | |
2605 | { | |
56347a2e | 2606 | return register_netdev(dev); |
1da177e4 LT |
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 | ||
1da177e4 | 2627 | static ssize_t |
3fd3c0a5 | 2628 | ctc_proto_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | |
3fd3c0a5 | 2640 | ctc_proto_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) |
1da177e4 LT |
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); | |
56347a2e FP |
2652 | if (!((value == CTC_PROTO_S390) || |
2653 | (value == CTC_PROTO_LINUX) || | |
2654 | (value == CTC_PROTO_OS390))) | |
1da177e4 LT |
2655 | return -EINVAL; |
2656 | priv->protocol = value; | |
2657 | ||
2658 | return count; | |
2659 | } | |
2660 | ||
1da177e4 | 2661 | static ssize_t |
3fd3c0a5 | 2662 | ctc_type_show(struct device *dev, struct device_attribute *attr, char *buf) |
1da177e4 LT |
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 | ||
7394c928 FP |
2673 | static DEVICE_ATTR(buffer, 0644, buffer_show, buffer_write); |
2674 | static DEVICE_ATTR(protocol, 0644, ctc_proto_show, ctc_proto_store); | |
1da177e4 LT |
2675 | static DEVICE_ATTR(type, 0444, ctc_type_show, NULL); |
2676 | ||
7394c928 FP |
2677 | static DEVICE_ATTR(loglevel, 0644, loglevel_show, loglevel_write); |
2678 | static DEVICE_ATTR(stats, 0644, stats_show, stats_write); | |
2679 | ||
1da177e4 LT |
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 | ||
7394c928 FP |
2691 | static int |
2692 | ctc_add_attributes(struct device *dev) | |
2693 | { | |
d7cf0d57 HC |
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; | |
7394c928 FP |
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 | ||
1da177e4 LT |
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. | |
e82b0f2c | 2733 | * |
1da177e4 LT |
2734 | * @param cgdev pointer to ccwgroup_device just added |
2735 | * | |
2736 | * @returns 0 on success, !0 on failure. | |
2737 | */ | |
1da177e4 LT |
2738 | static int |
2739 | ctc_probe_device(struct ccwgroup_device *cgdev) | |
2740 | { | |
2741 | struct ctc_priv *priv; | |
2742 | int rc; | |
7394c928 | 2743 | char buffer[16]; |
1da177e4 LT |
2744 | |
2745 | pr_debug("%s() called\n", __FUNCTION__); | |
7394c928 | 2746 | DBF_TEXT(setup, 3, __FUNCTION__); |
1da177e4 LT |
2747 | |
2748 | if (!get_device(&cgdev->dev)) | |
2749 | return -ENODEV; | |
2750 | ||
b7127dfe | 2751 | priv = kzalloc(sizeof(struct ctc_priv), GFP_KERNEL); |
1da177e4 LT |
2752 | if (!priv) { |
2753 | ctc_pr_err("%s: Out of memory\n", __func__); | |
2754 | put_device(&cgdev->dev); | |
2755 | return -ENOMEM; | |
2756 | } | |
2757 | ||
1da177e4 LT |
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 | ||
7394c928 FP |
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 | ||
1da177e4 LT |
2781 | return 0; |
2782 | } | |
2783 | ||
7394c928 FP |
2784 | /** |
2785 | * Initialize everything of the net device except the name and the | |
2786 | * channel structs. | |
2787 | */ | |
2788 | static struct net_device * | |
2789 | ctc_init_netdevice(struct net_device * dev, int alloc_device, | |
2790 | struct ctc_priv *privptr) | |
2791 | { | |
2792 | if (!privptr) | |
2793 | return NULL; | |
2794 | ||
2795 | DBF_TEXT(setup, 3, __FUNCTION__); | |
2796 | ||
2797 | if (alloc_device) { | |
b7127dfe | 2798 | dev = kzalloc(sizeof(struct net_device), GFP_KERNEL); |
7394c928 FP |
2799 | if (!dev) |
2800 | return NULL; | |
7394c928 FP |
2801 | } |
2802 | ||
2803 | dev->priv = privptr; | |
2804 | privptr->fsm = init_fsm("ctcdev", dev_state_names, | |
2805 | dev_event_names, CTC_NR_DEV_STATES, CTC_NR_DEV_EVENTS, | |
2806 | dev_fsm, DEV_FSM_LEN, GFP_KERNEL); | |
2807 | if (privptr->fsm == NULL) { | |
2808 | if (alloc_device) | |
2809 | kfree(dev); | |
2810 | return NULL; | |
2811 | } | |
2812 | fsm_newstate(privptr->fsm, DEV_STATE_STOPPED); | |
2813 | fsm_settimer(privptr->fsm, &privptr->restart_timer); | |
2814 | if (dev->mtu == 0) | |
2815 | dev->mtu = CTC_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | |
2816 | dev->hard_start_xmit = ctc_tx; | |
2817 | dev->open = ctc_open; | |
2818 | dev->stop = ctc_close; | |
2819 | dev->get_stats = ctc_stats; | |
2820 | dev->change_mtu = ctc_change_mtu; | |
2821 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
2822 | dev->addr_len = 0; | |
2823 | dev->type = ARPHRD_SLIP; | |
2824 | dev->tx_queue_len = 100; | |
2825 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
7394c928 FP |
2826 | return dev; |
2827 | } | |
2828 | ||
2829 | ||
1da177e4 LT |
2830 | /** |
2831 | * | |
2832 | * Setup an interface. | |
2833 | * | |
2834 | * @param cgdev Device to be setup. | |
2835 | * | |
2836 | * @returns 0 on success, !0 on failure. | |
2837 | */ | |
2838 | static int | |
2839 | ctc_new_device(struct ccwgroup_device *cgdev) | |
2840 | { | |
2841 | char read_id[CTC_ID_SIZE]; | |
2842 | char write_id[CTC_ID_SIZE]; | |
2843 | int direction; | |
2844 | enum channel_types type; | |
2845 | struct ctc_priv *privptr; | |
2846 | struct net_device *dev; | |
2847 | int ret; | |
7394c928 | 2848 | char buffer[16]; |
1da177e4 LT |
2849 | |
2850 | pr_debug("%s() called\n", __FUNCTION__); | |
2851 | DBF_TEXT(setup, 3, __FUNCTION__); | |
2852 | ||
2853 | privptr = cgdev->dev.driver_data; | |
2854 | if (!privptr) | |
2855 | return -ENODEV; | |
2856 | ||
7394c928 FP |
2857 | sprintf(buffer, "%d", privptr->buffer_size); |
2858 | DBF_TEXT(setup, 3, buffer); | |
2859 | ||
1da177e4 | 2860 | type = get_channel_type(&cgdev->cdev[0]->id); |
e82b0f2c | 2861 | |
1da177e4 LT |
2862 | snprintf(read_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id); |
2863 | snprintf(write_id, CTC_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id); | |
2864 | ||
2865 | if (add_channel(cgdev->cdev[0], type)) | |
2866 | return -ENOMEM; | |
2867 | if (add_channel(cgdev->cdev[1], type)) | |
2868 | return -ENOMEM; | |
2869 | ||
2870 | ret = ccw_device_set_online(cgdev->cdev[0]); | |
2871 | if (ret != 0) { | |
2872 | printk(KERN_WARNING | |
2873 | "ccw_device_set_online (cdev[0]) failed with ret = %d\n", ret); | |
2874 | } | |
2875 | ||
2876 | ret = ccw_device_set_online(cgdev->cdev[1]); | |
2877 | if (ret != 0) { | |
2878 | printk(KERN_WARNING | |
2879 | "ccw_device_set_online (cdev[1]) failed with ret = %d\n", ret); | |
2880 | } | |
2881 | ||
2882 | dev = ctc_init_netdevice(NULL, 1, privptr); | |
2883 | ||
2884 | if (!dev) { | |
2885 | ctc_pr_warn("ctc_init_netdevice failed\n"); | |
2886 | goto out; | |
2887 | } | |
2888 | ||
56347a2e | 2889 | strlcpy(dev->name, "ctc%d", IFNAMSIZ); |
1da177e4 LT |
2890 | |
2891 | for (direction = READ; direction <= WRITE; direction++) { | |
2892 | privptr->channel[direction] = | |
2893 | channel_get(type, direction == READ ? read_id : write_id, | |
2894 | direction); | |
2895 | if (privptr->channel[direction] == NULL) { | |
e82b0f2c | 2896 | if (direction == WRITE) |
1da177e4 LT |
2897 | channel_free(privptr->channel[READ]); |
2898 | ||
2899 | ctc_free_netdevice(dev, 1); | |
2900 | goto out; | |
2901 | } | |
2902 | privptr->channel[direction]->netdev = dev; | |
2903 | privptr->channel[direction]->protocol = privptr->protocol; | |
2904 | privptr->channel[direction]->max_bufsize = privptr->buffer_size; | |
2905 | } | |
2906 | /* sysfs magic */ | |
2907 | SET_NETDEV_DEV(dev, &cgdev->dev); | |
2908 | ||
2909 | if (ctc_netdev_register(dev) != 0) { | |
2910 | ctc_free_netdevice(dev, 1); | |
2911 | goto out; | |
2912 | } | |
2913 | ||
d7cf0d57 HC |
2914 | if (ctc_add_attributes(&cgdev->dev)) { |
2915 | ctc_netdev_unregister(dev); | |
2916 | dev->priv = NULL; | |
2917 | ctc_free_netdevice(dev, 1); | |
2918 | goto out; | |
2919 | } | |
1da177e4 LT |
2920 | |
2921 | strlcpy(privptr->fsm->name, dev->name, sizeof (privptr->fsm->name)); | |
2922 | ||
2923 | print_banner(); | |
2924 | ||
2925 | ctc_pr_info("%s: read: %s, write: %s, proto: %d\n", | |
2926 | dev->name, privptr->channel[READ]->id, | |
2927 | privptr->channel[WRITE]->id, privptr->protocol); | |
2928 | ||
2929 | return 0; | |
2930 | out: | |
2931 | ccw_device_set_offline(cgdev->cdev[1]); | |
2932 | ccw_device_set_offline(cgdev->cdev[0]); | |
2933 | ||
2934 | return -ENODEV; | |
2935 | } | |
2936 | ||
2937 | /** | |
2938 | * Shutdown an interface. | |
2939 | * | |
2940 | * @param cgdev Device to be shut down. | |
2941 | * | |
2942 | * @returns 0 on success, !0 on failure. | |
2943 | */ | |
2944 | static int | |
2945 | ctc_shutdown_device(struct ccwgroup_device *cgdev) | |
2946 | { | |
2947 | struct ctc_priv *priv; | |
2948 | struct net_device *ndev; | |
e82b0f2c | 2949 | |
7394c928 | 2950 | DBF_TEXT(setup, 3, __FUNCTION__); |
1da177e4 LT |
2951 | pr_debug("%s() called\n", __FUNCTION__); |
2952 | ||
7394c928 | 2953 | |
1da177e4 LT |
2954 | priv = cgdev->dev.driver_data; |
2955 | ndev = NULL; | |
2956 | if (!priv) | |
2957 | return -ENODEV; | |
2958 | ||
2959 | if (priv->channel[READ]) { | |
2960 | ndev = priv->channel[READ]->netdev; | |
2961 | ||
2962 | /* Close the device */ | |
2963 | ctc_close(ndev); | |
2964 | ndev->flags &=~IFF_RUNNING; | |
2965 | ||
2966 | ctc_remove_attributes(&cgdev->dev); | |
2967 | ||
2968 | channel_free(priv->channel[READ]); | |
2969 | } | |
2970 | if (priv->channel[WRITE]) | |
2971 | channel_free(priv->channel[WRITE]); | |
2972 | ||
2973 | if (ndev) { | |
2974 | ctc_netdev_unregister(ndev); | |
2975 | ndev->priv = NULL; | |
2976 | ctc_free_netdevice(ndev, 1); | |
2977 | } | |
2978 | ||
2979 | if (priv->fsm) | |
2980 | kfree_fsm(priv->fsm); | |
2981 | ||
2982 | ccw_device_set_offline(cgdev->cdev[1]); | |
2983 | ccw_device_set_offline(cgdev->cdev[0]); | |
2984 | ||
2985 | if (priv->channel[READ]) | |
2986 | channel_remove(priv->channel[READ]); | |
2987 | if (priv->channel[WRITE]) | |
2988 | channel_remove(priv->channel[WRITE]); | |
1da177e4 LT |
2989 | priv->channel[READ] = priv->channel[WRITE] = NULL; |
2990 | ||
2991 | return 0; | |
2992 | ||
2993 | } | |
2994 | ||
2995 | static void | |
2996 | ctc_remove_device(struct ccwgroup_device *cgdev) | |
2997 | { | |
2998 | struct ctc_priv *priv; | |
2999 | ||
3000 | pr_debug("%s() called\n", __FUNCTION__); | |
7394c928 | 3001 | DBF_TEXT(setup, 3, __FUNCTION__); |
1da177e4 LT |
3002 | |
3003 | priv = cgdev->dev.driver_data; | |
3004 | if (!priv) | |
3005 | return; | |
3006 | if (cgdev->state == CCWGROUP_ONLINE) | |
3007 | ctc_shutdown_device(cgdev); | |
3008 | ctc_remove_files(&cgdev->dev); | |
3009 | cgdev->dev.driver_data = NULL; | |
3010 | kfree(priv); | |
3011 | put_device(&cgdev->dev); | |
3012 | } | |
3013 | ||
3014 | static struct ccwgroup_driver ctc_group_driver = { | |
3015 | .owner = THIS_MODULE, | |
3016 | .name = "ctc", | |
3017 | .max_slaves = 2, | |
3018 | .driver_id = 0xC3E3C3, | |
3019 | .probe = ctc_probe_device, | |
3020 | .remove = ctc_remove_device, | |
3021 | .set_online = ctc_new_device, | |
3022 | .set_offline = ctc_shutdown_device, | |
3023 | }; | |
3024 | ||
3025 | /** | |
3026 | * Module related routines | |
3027 | *****************************************************************************/ | |
3028 | ||
3029 | /** | |
3030 | * Prepare to be unloaded. Free IRQ's and release all resources. | |
3031 | * This is called just before this module is unloaded. It is | |
3032 | * <em>not</em> called, if the usage count is !0, so we don't need to check | |
3033 | * for that. | |
3034 | */ | |
3035 | static void __exit | |
3036 | ctc_exit(void) | |
3037 | { | |
7394c928 | 3038 | DBF_TEXT(setup, 3, __FUNCTION__); |
1da177e4 | 3039 | unregister_cu3088_discipline(&ctc_group_driver); |
1da177e4 LT |
3040 | ctc_unregister_dbf_views(); |
3041 | ctc_pr_info("CTC driver unloaded\n"); | |
3042 | } | |
3043 | ||
3044 | /** | |
3045 | * Initialize module. | |
3046 | * This is called just after the module is loaded. | |
3047 | * | |
3048 | * @return 0 on success, !0 on error. | |
3049 | */ | |
3050 | static int __init | |
3051 | ctc_init(void) | |
3052 | { | |
3053 | int ret = 0; | |
3054 | ||
7394c928 FP |
3055 | loglevel = CTC_LOGLEVEL_DEFAULT; |
3056 | ||
3057 | DBF_TEXT(setup, 3, __FUNCTION__); | |
3058 | ||
1da177e4 LT |
3059 | print_banner(); |
3060 | ||
3061 | ret = ctc_register_dbf_views(); | |
3062 | if (ret){ | |
3063 | ctc_pr_crit("ctc_init failed with ctc_register_dbf_views rc = %d\n", ret); | |
3064 | return ret; | |
3065 | } | |
1da177e4 LT |
3066 | ret = register_cu3088_discipline(&ctc_group_driver); |
3067 | if (ret) { | |
1da177e4 LT |
3068 | ctc_unregister_dbf_views(); |
3069 | } | |
3070 | return ret; | |
3071 | } | |
3072 | ||
3073 | module_init(ctc_init); | |
3074 | module_exit(ctc_exit); | |
3075 | ||
3076 | /* --- This is the END my friend --- */ |