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arm: Footbridge: Use common i8253 clockevent
[linux-2.6/linux-mips.git] / drivers / s390 / net / ctcm_main.c
blob426787efc49204c8a11036f0236a446c5e866dde
1 /*
2 * drivers/s390/net/ctcm_main.c
3 *
4 * Copyright IBM Corp. 2001, 2009
5 * Author(s):
6 * Original CTC driver(s):
7 * Fritz Elfert (felfert@millenux.com)
8 * Dieter Wellerdiek (wel@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 * Denis Joseph Barrow (barrow_dj@yahoo.com)
11 * Jochen Roehrig (roehrig@de.ibm.com)
12 * Cornelia Huck <cornelia.huck@de.ibm.com>
13 * MPC additions:
14 * Belinda Thompson (belindat@us.ibm.com)
15 * Andy Richter (richtera@us.ibm.com)
16 * Revived by:
17 * Peter Tiedemann (ptiedem@de.ibm.com)
18 */
19
20 #undef DEBUG
21 #undef DEBUGDATA
22 #undef DEBUGCCW
23
24 #define KMSG_COMPONENT "ctcm"
25 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26
27 #include <linux/kernel_stat.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/types.h>
34 #include <linux/interrupt.h>
35 #include <linux/timer.h>
36 #include <linux/bitops.h>
37
38 #include <linux/signal.h>
39 #include <linux/string.h>
40
41 #include <linux/ip.h>
42 #include <linux/if_arp.h>
43 #include <linux/tcp.h>
44 #include <linux/skbuff.h>
45 #include <linux/ctype.h>
46 #include <net/dst.h>
47
48 #include <linux/io.h>
49 #include <asm/ccwdev.h>
50 #include <asm/ccwgroup.h>
51 #include <linux/uaccess.h>
52
53 #include <asm/idals.h>
54
55 #include "ctcm_fsms.h"
56 #include "ctcm_main.h"
57
58 /* Some common global variables */
59
60 /**
61 * The root device for ctcm group devices
62 */
63 static struct device *ctcm_root_dev;
64
65 /*
66 * Linked list of all detected channels.
67 */
68 struct channel *channels;
69
70 /**
71 * Unpack a just received skb and hand it over to
72 * upper layers.
73 *
74 * ch The channel where this skb has been received.
75 * pskb The received skb.
76 */
77 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
78 {
79 struct net_device *dev = ch->netdev;
80 struct ctcm_priv *priv = dev->ml_priv;
81 __u16 len = *((__u16 *) pskb->data);
82
83 skb_put(pskb, 2 + LL_HEADER_LENGTH);
84 skb_pull(pskb, 2);
85 pskb->dev = dev;
86 pskb->ip_summed = CHECKSUM_UNNECESSARY;
87 while (len > 0) {
88 struct sk_buff *skb;
89 int skblen;
90 struct ll_header *header = (struct ll_header *)pskb->data;
91
92 skb_pull(pskb, LL_HEADER_LENGTH);
93 if ((ch->protocol == CTCM_PROTO_S390) &&
94 (header->type != ETH_P_IP)) {
95 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
96 ch->logflags |= LOG_FLAG_ILLEGALPKT;
97 /*
98 * Check packet type only if we stick strictly
99 * to S/390's protocol of OS390. This only
100 * supports IP. Otherwise allow any packet
101 * type.
102 */
103 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
104 "%s(%s): Illegal packet type 0x%04x"
105 " - dropping",
106 CTCM_FUNTAIL, dev->name, header->type);
107 }
108 priv->stats.rx_dropped++;
109 priv->stats.rx_frame_errors++;
110 return;
111 }
112 pskb->protocol = ntohs(header->type);
113 if ((header->length <= LL_HEADER_LENGTH) ||
114 (len <= LL_HEADER_LENGTH)) {
115 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
116 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
117 "%s(%s): Illegal packet size %d(%d,%d)"
118 "- dropping",
119 CTCM_FUNTAIL, dev->name,
120 header->length, dev->mtu, len);
121 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
122 }
123
124 priv->stats.rx_dropped++;
125 priv->stats.rx_length_errors++;
126 return;
127 }
128 header->length -= LL_HEADER_LENGTH;
129 len -= LL_HEADER_LENGTH;
130 if ((header->length > skb_tailroom(pskb)) ||
131 (header->length > len)) {
132 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
133 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
134 "%s(%s): Packet size %d (overrun)"
135 " - dropping", CTCM_FUNTAIL,
136 dev->name, header->length);
137 ch->logflags |= LOG_FLAG_OVERRUN;
138 }
139
140 priv->stats.rx_dropped++;
141 priv->stats.rx_length_errors++;
142 return;
143 }
144 skb_put(pskb, header->length);
145 skb_reset_mac_header(pskb);
146 len -= header->length;
147 skb = dev_alloc_skb(pskb->len);
148 if (!skb) {
149 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
150 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
151 "%s(%s): MEMORY allocation error",
152 CTCM_FUNTAIL, dev->name);
153 ch->logflags |= LOG_FLAG_NOMEM;
154 }
155 priv->stats.rx_dropped++;
156 return;
157 }
158 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
159 pskb->len);
160 skb_reset_mac_header(skb);
161 skb->dev = pskb->dev;
162 skb->protocol = pskb->protocol;
163 pskb->ip_summed = CHECKSUM_UNNECESSARY;
164 skblen = skb->len;
165 /*
166 * reset logflags
167 */
168 ch->logflags = 0;
169 priv->stats.rx_packets++;
170 priv->stats.rx_bytes += skblen;
171 netif_rx_ni(skb);
172 if (len > 0) {
173 skb_pull(pskb, header->length);
174 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
175 CTCM_DBF_DEV_NAME(TRACE, dev,
176 "Overrun in ctcm_unpack_skb");
177 ch->logflags |= LOG_FLAG_OVERRUN;
178 return;
179 }
180 skb_put(pskb, LL_HEADER_LENGTH);
181 }
182 }
183 }
184
185 /**
186 * Release a specific channel in the channel list.
187 *
188 * ch Pointer to channel struct to be released.
189 */
190 static void channel_free(struct channel *ch)
191 {
192 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
193 ch->flags &= ~CHANNEL_FLAGS_INUSE;
194 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
195 }
196
197 /**
198 * Remove a specific channel in the channel list.
199 *
200 * ch Pointer to channel struct to be released.
201 */
202 static void channel_remove(struct channel *ch)
203 {
204 struct channel **c = &channels;
205 char chid[CTCM_ID_SIZE+1];
206 int ok = 0;
207
208 if (ch == NULL)
209 return;
210 else
211 strncpy(chid, ch->id, CTCM_ID_SIZE);
212
213 channel_free(ch);
214 while (*c) {
215 if (*c == ch) {
216 *c = ch->next;
217 fsm_deltimer(&ch->timer);
218 if (IS_MPC(ch))
219 fsm_deltimer(&ch->sweep_timer);
220
221 kfree_fsm(ch->fsm);
222 clear_normalized_cda(&ch->ccw[4]);
223 if (ch->trans_skb != NULL) {
224 clear_normalized_cda(&ch->ccw[1]);
225 dev_kfree_skb_any(ch->trans_skb);
226 }
227 if (IS_MPC(ch)) {
228 tasklet_kill(&ch->ch_tasklet);
229 tasklet_kill(&ch->ch_disc_tasklet);
230 kfree(ch->discontact_th);
231 }
232 kfree(ch->ccw);
233 kfree(ch->irb);
234 kfree(ch);
235 ok = 1;
236 break;
237 }
238 c = &((*c)->next);
239 }
240
241 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
242 chid, ok ? "OK" : "failed");
243 }
244
245 /**
246 * Get a specific channel from the channel list.
247 *
248 * type Type of channel we are interested in.
249 * id Id of channel we are interested in.
250 * direction Direction we want to use this channel for.
251 *
252 * returns Pointer to a channel or NULL if no matching channel available.
253 */
254 static struct channel *channel_get(enum ctcm_channel_types type,
255 char *id, int direction)
256 {
257 struct channel *ch = channels;
258
259 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
260 ch = ch->next;
261 if (!ch) {
262 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
263 "%s(%d, %s, %d) not found in channel list\n",
264 CTCM_FUNTAIL, type, id, direction);
265 } else {
266 if (ch->flags & CHANNEL_FLAGS_INUSE)
267 ch = NULL;
268 else {
269 ch->flags |= CHANNEL_FLAGS_INUSE;
270 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
271 ch->flags |= (direction == CTCM_WRITE)
272 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
273 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
274 }
275 }
276 return ch;
277 }
278
279 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
280 {
281 if (!IS_ERR(irb))
282 return 0;
283
284 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
285 "irb error %ld on device %s\n",
286 PTR_ERR(irb), dev_name(&cdev->dev));
287
288 switch (PTR_ERR(irb)) {
289 case -EIO:
290 dev_err(&cdev->dev,
291 "An I/O-error occurred on the CTCM device\n");
292 break;
293 case -ETIMEDOUT:
294 dev_err(&cdev->dev,
295 "An adapter hardware operation timed out\n");
296 break;
297 default:
298 dev_err(&cdev->dev,
299 "An error occurred on the adapter hardware\n");
300 }
301 return PTR_ERR(irb);
302 }
303
304
305 /**
306 * Check sense of a unit check.
307 *
308 * ch The channel, the sense code belongs to.
309 * sense The sense code to inspect.
310 */
311 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
312 {
313 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
314 "%s(%s): %02x",
315 CTCM_FUNTAIL, ch->id, sense);
316
317 if (sense & SNS0_INTERVENTION_REQ) {
318 if (sense & 0x01) {
319 if (ch->sense_rc != 0x01) {
320 pr_notice(
321 "%s: The communication peer has "
322 "disconnected\n", ch->id);
323 ch->sense_rc = 0x01;
324 }
325 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
326 } else {
327 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
328 pr_notice(
329 "%s: The remote operating system is "
330 "not available\n", ch->id);
331 ch->sense_rc = SNS0_INTERVENTION_REQ;
332 }
333 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
334 }
335 } else if (sense & SNS0_EQUIPMENT_CHECK) {
336 if (sense & SNS0_BUS_OUT_CHECK) {
337 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
338 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
339 "%s(%s): remote HW error %02x",
340 CTCM_FUNTAIL, ch->id, sense);
341 ch->sense_rc = SNS0_BUS_OUT_CHECK;
342 }
343 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
344 } else {
345 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
346 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
347 "%s(%s): remote read parity error %02x",
348 CTCM_FUNTAIL, ch->id, sense);
349 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
350 }
351 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
352 }
353 } else if (sense & SNS0_BUS_OUT_CHECK) {
354 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
355 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
356 "%s(%s): BUS OUT error %02x",
357 CTCM_FUNTAIL, ch->id, sense);
358 ch->sense_rc = SNS0_BUS_OUT_CHECK;
359 }
360 if (sense & 0x04) /* data-streaming timeout */
361 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
362 else /* Data-transfer parity error */
363 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
364 } else if (sense & SNS0_CMD_REJECT) {
365 if (ch->sense_rc != SNS0_CMD_REJECT) {
366 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
367 "%s(%s): Command rejected",
368 CTCM_FUNTAIL, ch->id);
369 ch->sense_rc = SNS0_CMD_REJECT;
370 }
371 } else if (sense == 0) {
372 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
373 "%s(%s): Unit check ZERO",
374 CTCM_FUNTAIL, ch->id);
375 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
376 } else {
377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
378 "%s(%s): Unit check code %02x unknown",
379 CTCM_FUNTAIL, ch->id, sense);
380 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
381 }
382 }
383
384 int ctcm_ch_alloc_buffer(struct channel *ch)
385 {
386 clear_normalized_cda(&ch->ccw[1]);
387 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
388 if (ch->trans_skb == NULL) {
389 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
390 "%s(%s): %s trans_skb allocation error",
391 CTCM_FUNTAIL, ch->id,
392 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
393 "RX" : "TX");
394 return -ENOMEM;
395 }
396
397 ch->ccw[1].count = ch->max_bufsize;
398 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
399 dev_kfree_skb(ch->trans_skb);
400 ch->trans_skb = NULL;
401 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
402 "%s(%s): %s set norm_cda failed",
403 CTCM_FUNTAIL, ch->id,
404 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
405 "RX" : "TX");
406 return -ENOMEM;
407 }
408
409 ch->ccw[1].count = 0;
410 ch->trans_skb_data = ch->trans_skb->data;
411 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
412 return 0;
413 }
414
415 /*
416 * Interface API for upper network layers
417 */
418
419 /**
420 * Open an interface.
421 * Called from generic network layer when ifconfig up is run.
422 *
423 * dev Pointer to interface struct.
424 *
425 * returns 0 on success, -ERRNO on failure. (Never fails.)
426 */
427 int ctcm_open(struct net_device *dev)
428 {
429 struct ctcm_priv *priv = dev->ml_priv;
430
431 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
432 if (!IS_MPC(priv))
433 fsm_event(priv->fsm, DEV_EVENT_START, dev);
434 return 0;
435 }
436
437 /**
438 * Close an interface.
439 * Called from generic network layer when ifconfig down is run.
440 *
441 * dev Pointer to interface struct.
442 *
443 * returns 0 on success, -ERRNO on failure. (Never fails.)
444 */
445 int ctcm_close(struct net_device *dev)
446 {
447 struct ctcm_priv *priv = dev->ml_priv;
448
449 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
450 if (!IS_MPC(priv))
451 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
452 return 0;
453 }
454
455
456 /**
457 * Transmit a packet.
458 * This is a helper function for ctcm_tx().
459 *
460 * ch Channel to be used for sending.
461 * skb Pointer to struct sk_buff of packet to send.
462 * The linklevel header has already been set up
463 * by ctcm_tx().
464 *
465 * returns 0 on success, -ERRNO on failure. (Never fails.)
466 */
467 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
468 {
469 unsigned long saveflags;
470 struct ll_header header;
471 int rc = 0;
472 __u16 block_len;
473 int ccw_idx;
474 struct sk_buff *nskb;
475 unsigned long hi;
476
477 /* we need to acquire the lock for testing the state
478 * otherwise we can have an IRQ changing the state to
479 * TXIDLE after the test but before acquiring the lock.
480 */
481 spin_lock_irqsave(&ch->collect_lock, saveflags);
482 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
483 int l = skb->len + LL_HEADER_LENGTH;
484
485 if (ch->collect_len + l > ch->max_bufsize - 2) {
486 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
487 return -EBUSY;
488 } else {
489 atomic_inc(&skb->users);
490 header.length = l;
491 header.type = skb->protocol;
492 header.unused = 0;
493 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
494 LL_HEADER_LENGTH);
495 skb_queue_tail(&ch->collect_queue, skb);
496 ch->collect_len += l;
497 }
498 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
499 goto done;
500 }
501 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
502 /*
503 * Protect skb against beeing free'd by upper
504 * layers.
505 */
506 atomic_inc(&skb->users);
507 ch->prof.txlen += skb->len;
508 header.length = skb->len + LL_HEADER_LENGTH;
509 header.type = skb->protocol;
510 header.unused = 0;
511 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
512 block_len = skb->len + 2;
513 *((__u16 *)skb_push(skb, 2)) = block_len;
514
515 /*
516 * IDAL support in CTCM is broken, so we have to
517 * care about skb's above 2G ourselves.
518 */
519 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
520 if (hi) {
521 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
522 if (!nskb) {
523 atomic_dec(&skb->users);
524 skb_pull(skb, LL_HEADER_LENGTH + 2);
525 ctcm_clear_busy(ch->netdev);
526 return -ENOMEM;
527 } else {
528 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
529 atomic_inc(&nskb->users);
530 atomic_dec(&skb->users);
531 dev_kfree_skb_irq(skb);
532 skb = nskb;
533 }
534 }
535
536 ch->ccw[4].count = block_len;
537 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
538 /*
539 * idal allocation failed, try via copying to
540 * trans_skb. trans_skb usually has a pre-allocated
541 * idal.
542 */
543 if (ctcm_checkalloc_buffer(ch)) {
544 /*
545 * Remove our header. It gets added
546 * again on retransmit.
547 */
548 atomic_dec(&skb->users);
549 skb_pull(skb, LL_HEADER_LENGTH + 2);
550 ctcm_clear_busy(ch->netdev);
551 return -ENOMEM;
552 }
553
554 skb_reset_tail_pointer(ch->trans_skb);
555 ch->trans_skb->len = 0;
556 ch->ccw[1].count = skb->len;
557 skb_copy_from_linear_data(skb,
558 skb_put(ch->trans_skb, skb->len), skb->len);
559 atomic_dec(&skb->users);
560 dev_kfree_skb_irq(skb);
561 ccw_idx = 0;
562 } else {
563 skb_queue_tail(&ch->io_queue, skb);
564 ccw_idx = 3;
565 }
566 ch->retry = 0;
567 fsm_newstate(ch->fsm, CTC_STATE_TX);
568 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
569 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
570 ch->prof.send_stamp = current_kernel_time(); /* xtime */
571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572 (unsigned long)ch, 0xff, 0);
573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574 if (ccw_idx == 3)
575 ch->prof.doios_single++;
576 if (rc != 0) {
577 fsm_deltimer(&ch->timer);
578 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579 if (ccw_idx == 3)
580 skb_dequeue_tail(&ch->io_queue);
581 /*
582 * Remove our header. It gets added
583 * again on retransmit.
584 */
585 skb_pull(skb, LL_HEADER_LENGTH + 2);
586 } else if (ccw_idx == 0) {
587 struct net_device *dev = ch->netdev;
588 struct ctcm_priv *priv = dev->ml_priv;
589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
592 done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595 }
596
597 static void ctcmpc_send_sweep_req(struct channel *rch)
598 {
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
605 /* int rc = 0; */
606
607 priv = dev->ml_priv;
608 grp = priv->mpcg;
609 ch = priv->channel[CTCM_WRITE];
610
611 /* sweep processing is not complete until response and request */
612 /* has completed for all read channels in group */
613 if (grp->in_sweep == 0) {
614 grp->in_sweep = 1;
615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
622 /* rc = -ENOMEM; */
623 goto nomem;
624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 dev->trans_start = jiffies;
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
652 nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657 return;
658 }
659
660 /*
661 * MPC mode version of transmit_skb
662 */
663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664 {
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
667 struct ctcm_priv *priv = dev->ml_priv;
668 struct mpc_group *grp = priv->mpcg;
669 struct th_header *header;
670 struct sk_buff *nskb;
671 int rc = 0;
672 int ccw_idx;
673 unsigned long hi;
674 unsigned long saveflags = 0; /* avoids compiler warning */
675
676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 atomic_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
687 goto nomem_exit;
688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (skb->protocol == ntohs(ETH_P_SNAP)) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 atomic_inc(&skb->users);
720
721 /*
722 * IDAL support in CTCM is broken, so we have to
723 * care about skb's above 2G ourselves.
724 */
725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726 if (hi) {
727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728 if (!nskb) {
729 goto nomem_exit;
730 } else {
731 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
732 atomic_inc(&nskb->users);
733 atomic_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741 if (!p_header)
742 goto nomem_exit;
743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (skb->protocol == ntohs(ETH_P_SNAP)) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772 if (!header)
773 goto nomem_exit;
774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
803 * Remove our header.
804 * It gets added again on retransmit.
805 */
806 goto nomem_exit;
807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
813 atomic_dec(&skb->users);
814 dev_kfree_skb_irq(skb);
815 ccw_idx = 0;
816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817 "up to 32 bytes sent to vtam:\n",
818 __func__, dev->name, ch->trans_skb->len);
819 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820 min_t(int, 32, ch->trans_skb->len));
821 } else {
822 skb_queue_tail(&ch->io_queue, skb);
823 ccw_idx = 3;
824 }
825 ch->retry = 0;
826 fsm_newstate(ch->fsm, CTC_STATE_TX);
827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829 if (do_debug_ccw)
830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831 sizeof(struct ccw1) * 3);
832
833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834 ch->prof.send_stamp = current_kernel_time(); /* xtime */
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
850 ctcmpc_send_sweep_req(ch);
851
852 goto done;
853 nomem_exit:
854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855 "%s(%s): MEMORY allocation ERROR\n",
856 CTCM_FUNTAIL, ch->id);
857 rc = -ENOMEM;
858 atomic_dec(&skb->users);
859 dev_kfree_skb_any(skb);
860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
861 done:
862 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
863 return rc;
864 }
865
866 /**
867 * Start transmission of a packet.
868 * Called from generic network device layer.
869 *
870 * skb Pointer to buffer containing the packet.
871 * dev Pointer to interface struct.
872 *
873 * returns 0 if packet consumed, !0 if packet rejected.
874 * Note: If we return !0, then the packet is free'd by
875 * the generic network layer.
876 */
877 /* first merge version - leaving both functions separated */
878 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
879 {
880 struct ctcm_priv *priv = dev->ml_priv;
881
882 if (skb == NULL) {
883 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
884 "%s(%s): NULL sk_buff passed",
885 CTCM_FUNTAIL, dev->name);
886 priv->stats.tx_dropped++;
887 return NETDEV_TX_OK;
888 }
889 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891 "%s(%s): Got sk_buff with head room < %ld bytes",
892 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
893 dev_kfree_skb(skb);
894 priv->stats.tx_dropped++;
895 return NETDEV_TX_OK;
896 }
897
898 /*
899 * If channels are not running, try to restart them
900 * and throw away packet.
901 */
902 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
903 fsm_event(priv->fsm, DEV_EVENT_START, dev);
904 dev_kfree_skb(skb);
905 priv->stats.tx_dropped++;
906 priv->stats.tx_errors++;
907 priv->stats.tx_carrier_errors++;
908 return NETDEV_TX_OK;
909 }
910
911 if (ctcm_test_and_set_busy(dev))
912 return NETDEV_TX_BUSY;
913
914 dev->trans_start = jiffies;
915 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
916 return NETDEV_TX_BUSY;
917 return NETDEV_TX_OK;
918 }
919
920 /* unmerged MPC variant of ctcm_tx */
921 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
922 {
923 int len = 0;
924 struct ctcm_priv *priv = dev->ml_priv;
925 struct mpc_group *grp = priv->mpcg;
926 struct sk_buff *newskb = NULL;
927
928 /*
929 * Some sanity checks ...
930 */
931 if (skb == NULL) {
932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933 "%s(%s): NULL sk_buff passed",
934 CTCM_FUNTAIL, dev->name);
935 priv->stats.tx_dropped++;
936 goto done;
937 }
938 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
939 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
940 "%s(%s): Got sk_buff with head room < %ld bytes",
941 CTCM_FUNTAIL, dev->name,
942 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
943
944 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
945
946 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
947 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
948
949 if (!newskb) {
950 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
951 "%s: %s: __dev_alloc_skb failed",
952 __func__, dev->name);
953
954 dev_kfree_skb_any(skb);
955 priv->stats.tx_dropped++;
956 priv->stats.tx_errors++;
957 priv->stats.tx_carrier_errors++;
958 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
959 goto done;
960 }
961 newskb->protocol = skb->protocol;
962 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
963 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
964 dev_kfree_skb_any(skb);
965 skb = newskb;
966 }
967
968 /*
969 * If channels are not running,
970 * notify anybody about a link failure and throw
971 * away packet.
972 */
973 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
974 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
975 dev_kfree_skb_any(skb);
976 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
977 "%s(%s): inactive MPCGROUP - dropped",
978 CTCM_FUNTAIL, dev->name);
979 priv->stats.tx_dropped++;
980 priv->stats.tx_errors++;
981 priv->stats.tx_carrier_errors++;
982 goto done;
983 }
984
985 if (ctcm_test_and_set_busy(dev)) {
986 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
987 "%s(%s): device busy - dropped",
988 CTCM_FUNTAIL, dev->name);
989 dev_kfree_skb_any(skb);
990 priv->stats.tx_dropped++;
991 priv->stats.tx_errors++;
992 priv->stats.tx_carrier_errors++;
993 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
994 goto done;
995 }
996
997 dev->trans_start = jiffies;
998 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
999 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000 "%s(%s): device error - dropped",
1001 CTCM_FUNTAIL, dev->name);
1002 dev_kfree_skb_any(skb);
1003 priv->stats.tx_dropped++;
1004 priv->stats.tx_errors++;
1005 priv->stats.tx_carrier_errors++;
1006 ctcm_clear_busy(dev);
1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008 goto done;
1009 }
1010 ctcm_clear_busy(dev);
1011 done:
1012 if (do_debug)
1013 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
1015 return NETDEV_TX_OK; /* handle freeing of skb here */
1016 }
1017
1018
1019 /**
1020 * Sets MTU of an interface.
1021 *
1022 * dev Pointer to interface struct.
1023 * new_mtu The new MTU to use for this interface.
1024 *
1025 * returns 0 on success, -EINVAL if MTU is out of valid range.
1026 * (valid range is 576 .. 65527). If VM is on the
1027 * remote side, maximum MTU is 32760, however this is
1028 * not checked here.
1029 */
1030 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031 {
1032 struct ctcm_priv *priv;
1033 int max_bufsize;
1034
1035 if (new_mtu < 576 || new_mtu > 65527)
1036 return -EINVAL;
1037
1038 priv = dev->ml_priv;
1039 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1040
1041 if (IS_MPC(priv)) {
1042 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043 return -EINVAL;
1044 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045 } else {
1046 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047 return -EINVAL;
1048 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049 }
1050 dev->mtu = new_mtu;
1051 return 0;
1052 }
1053
1054 /**
1055 * Returns interface statistics of a device.
1056 *
1057 * dev Pointer to interface struct.
1058 *
1059 * returns Pointer to stats struct of this interface.
1060 */
1061 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062 {
1063 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1064 }
1065
1066 static void ctcm_free_netdevice(struct net_device *dev)
1067 {
1068 struct ctcm_priv *priv;
1069 struct mpc_group *grp;
1070
1071 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072 "%s(%s)", CTCM_FUNTAIL, dev->name);
1073 priv = dev->ml_priv;
1074 if (priv) {
1075 grp = priv->mpcg;
1076 if (grp) {
1077 if (grp->fsm)
1078 kfree_fsm(grp->fsm);
1079 if (grp->xid_skb)
1080 dev_kfree_skb(grp->xid_skb);
1081 if (grp->rcvd_xid_skb)
1082 dev_kfree_skb(grp->rcvd_xid_skb);
1083 tasklet_kill(&grp->mpc_tasklet2);
1084 kfree(grp);
1085 priv->mpcg = NULL;
1086 }
1087 if (priv->fsm) {
1088 kfree_fsm(priv->fsm);
1089 priv->fsm = NULL;
1090 }
1091 kfree(priv->xid);
1092 priv->xid = NULL;
1093 /*
1094 * Note: kfree(priv); is done in "opposite" function of
1095 * allocator function probe_device which is remove_device.
1096 */
1097 }
1098 #ifdef MODULE
1099 free_netdev(dev);
1100 #endif
1101 }
1102
1103 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
1105 static const struct net_device_ops ctcm_netdev_ops = {
1106 .ndo_open = ctcm_open,
1107 .ndo_stop = ctcm_close,
1108 .ndo_get_stats = ctcm_stats,
1109 .ndo_change_mtu = ctcm_change_mtu,
1110 .ndo_start_xmit = ctcm_tx,
1111 };
1112
1113 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114 .ndo_open = ctcm_open,
1115 .ndo_stop = ctcm_close,
1116 .ndo_get_stats = ctcm_stats,
1117 .ndo_change_mtu = ctcm_change_mtu,
1118 .ndo_start_xmit = ctcmpc_tx,
1119 };
1120
1121 void static ctcm_dev_setup(struct net_device *dev)
1122 {
1123 dev->type = ARPHRD_SLIP;
1124 dev->tx_queue_len = 100;
1125 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126 }
1127
1128 /*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133 {
1134 struct net_device *dev;
1135 struct mpc_group *grp;
1136 if (!priv)
1137 return NULL;
1138
1139 if (IS_MPC(priv))
1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1141 else
1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1143
1144 if (!dev) {
1145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1146 "%s: MEMORY allocation ERROR",
1147 CTCM_FUNTAIL);
1148 return NULL;
1149 }
1150 dev->ml_priv = priv;
1151 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1152 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1153 dev_fsm, dev_fsm_len, GFP_KERNEL);
1154 if (priv->fsm == NULL) {
1155 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1156 free_netdev(dev);
1157 return NULL;
1158 }
1159 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1160 fsm_settimer(priv->fsm, &priv->restart_timer);
1161
1162 if (IS_MPC(priv)) {
1163 /* MPC Group Initializations */
1164 grp = ctcmpc_init_mpc_group(priv);
1165 if (grp == NULL) {
1166 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1167 free_netdev(dev);
1168 return NULL;
1169 }
1170 tasklet_init(&grp->mpc_tasklet2,
1171 mpc_group_ready, (unsigned long)dev);
1172 dev->mtu = MPC_BUFSIZE_DEFAULT -
1173 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1174
1175 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1176 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1177 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1178 } else {
1179 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1180 dev->netdev_ops = &ctcm_netdev_ops;
1181 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1182 }
1183
1184 CTCMY_DBF_DEV(SETUP, dev, "finished");
1185
1186 return dev;
1187 }
1188
1189 /**
1190 * Main IRQ handler.
1191 *
1192 * cdev The ccw_device the interrupt is for.
1193 * intparm interruption parameter.
1194 * irb interruption response block.
1195 */
1196 static void ctcm_irq_handler(struct ccw_device *cdev,
1197 unsigned long intparm, struct irb *irb)
1198 {
1199 struct channel *ch;
1200 struct net_device *dev;
1201 struct ctcm_priv *priv;
1202 struct ccwgroup_device *cgdev;
1203 int cstat;
1204 int dstat;
1205
1206 kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
1207 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1208 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1209
1210 if (ctcm_check_irb_error(cdev, irb))
1211 return;
1212
1213 cgdev = dev_get_drvdata(&cdev->dev);
1214
1215 cstat = irb->scsw.cmd.cstat;
1216 dstat = irb->scsw.cmd.dstat;
1217
1218 /* Check for unsolicited interrupts. */
1219 if (cgdev == NULL) {
1220 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1221 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1222 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1223 dev_warn(&cdev->dev,
1224 "The adapter received a non-specific IRQ\n");
1225 return;
1226 }
1227
1228 priv = dev_get_drvdata(&cgdev->dev);
1229
1230 /* Try to extract channel from driver data. */
1231 if (priv->channel[CTCM_READ]->cdev == cdev)
1232 ch = priv->channel[CTCM_READ];
1233 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1234 ch = priv->channel[CTCM_WRITE];
1235 else {
1236 dev_err(&cdev->dev,
1237 "%s: Internal error: Can't determine channel for "
1238 "interrupt device %s\n",
1239 __func__, dev_name(&cdev->dev));
1240 /* Explain: inconsistent internal structures */
1241 return;
1242 }
1243
1244 dev = ch->netdev;
1245 if (dev == NULL) {
1246 dev_err(&cdev->dev,
1247 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1248 __func__, ch);
1249 /* Explain: inconsistent internal structures */
1250 return;
1251 }
1252
1253 /* Copy interruption response block. */
1254 memcpy(ch->irb, irb, sizeof(struct irb));
1255
1256 /* Issue error message and return on subchannel error code */
1257 if (irb->scsw.cmd.cstat) {
1258 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1259 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1260 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1261 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1262 dev_warn(&cdev->dev,
1263 "A check occurred on the subchannel\n");
1264 return;
1265 }
1266
1267 /* Check the reason-code of a unit check */
1268 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1269 if ((irb->ecw[0] & ch->sense_rc) == 0)
1270 /* print it only once */
1271 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1272 "%s(%s): sense=%02x, ds=%02x",
1273 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1274 ccw_unit_check(ch, irb->ecw[0]);
1275 return;
1276 }
1277 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1278 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1279 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1280 else
1281 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1282 return;
1283 }
1284 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1285 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1286 return;
1287 }
1288 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1289 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1290 (irb->scsw.cmd.stctl ==
1291 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1292 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1293 else
1294 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1295
1296 }
1297
1298 /**
1299 * Add ctcm specific attributes.
1300 * Add ctcm private data.
1301 *
1302 * cgdev pointer to ccwgroup_device just added
1303 *
1304 * returns 0 on success, !0 on failure.
1305 */
1306 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1307 {
1308 struct ctcm_priv *priv;
1309 int rc;
1310
1311 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1312 "%s %p",
1313 __func__, cgdev);
1314
1315 if (!get_device(&cgdev->dev))
1316 return -ENODEV;
1317
1318 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1319 if (!priv) {
1320 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1321 "%s: memory allocation failure",
1322 CTCM_FUNTAIL);
1323 put_device(&cgdev->dev);
1324 return -ENOMEM;
1325 }
1326
1327 rc = ctcm_add_files(&cgdev->dev);
1328 if (rc) {
1329 kfree(priv);
1330 put_device(&cgdev->dev);
1331 return rc;
1332 }
1333 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1334 cgdev->cdev[0]->handler = ctcm_irq_handler;
1335 cgdev->cdev[1]->handler = ctcm_irq_handler;
1336 dev_set_drvdata(&cgdev->dev, priv);
1337
1338 return 0;
1339 }
1340
1341 /**
1342 * Add a new channel to the list of channels.
1343 * Keeps the channel list sorted.
1344 *
1345 * cdev The ccw_device to be added.
1346 * type The type class of the new channel.
1347 * priv Points to the private data of the ccwgroup_device.
1348 *
1349 * returns 0 on success, !0 on error.
1350 */
1351 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1352 struct ctcm_priv *priv)
1353 {
1354 struct channel **c = &channels;
1355 struct channel *ch;
1356 int ccw_num;
1357 int rc = 0;
1358
1359 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1360 "%s(%s), type %d, proto %d",
1361 __func__, dev_name(&cdev->dev), type, priv->protocol);
1362
1363 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1364 if (ch == NULL)
1365 return -ENOMEM;
1366
1367 ch->protocol = priv->protocol;
1368 if (IS_MPC(priv)) {
1369 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1370 if (ch->discontact_th == NULL)
1371 goto nomem_return;
1372
1373 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1374 tasklet_init(&ch->ch_disc_tasklet,
1375 mpc_action_send_discontact, (unsigned long)ch);
1376
1377 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1378 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1379 ccw_num = 17;
1380 } else
1381 ccw_num = 8;
1382
1383 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1384 if (ch->ccw == NULL)
1385 goto nomem_return;
1386
1387 ch->cdev = cdev;
1388 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1389 ch->type = type;
1390
1391 /**
1392 * "static" ccws are used in the following way:
1393 *
1394 * ccw[0..2] (Channel program for generic I/O):
1395 * 0: prepare
1396 * 1: read or write (depending on direction) with fixed
1397 * buffer (idal allocated once when buffer is allocated)
1398 * 2: nop
1399 * ccw[3..5] (Channel program for direct write of packets)
1400 * 3: prepare
1401 * 4: write (idal allocated on every write).
1402 * 5: nop
1403 * ccw[6..7] (Channel program for initial channel setup):
1404 * 6: set extended mode
1405 * 7: nop
1406 *
1407 * ch->ccw[0..5] are initialized in ch_action_start because
1408 * the channel's direction is yet unknown here.
1409 *
1410 * ccws used for xid2 negotiations
1411 * ch-ccw[8-14] need to be used for the XID exchange either
1412 * X side XID2 Processing
1413 * 8: write control
1414 * 9: write th
1415 * 10: write XID
1416 * 11: read th from secondary
1417 * 12: read XID from secondary
1418 * 13: read 4 byte ID
1419 * 14: nop
1420 * Y side XID Processing
1421 * 8: sense
1422 * 9: read th
1423 * 10: read XID
1424 * 11: write th
1425 * 12: write XID
1426 * 13: write 4 byte ID
1427 * 14: nop
1428 *
1429 * ccws used for double noop due to VM timing issues
1430 * which result in unrecoverable Busy on channel
1431 * 15: nop
1432 * 16: nop
1433 */
1434 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1435 ch->ccw[6].flags = CCW_FLAG_SLI;
1436
1437 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1438 ch->ccw[7].flags = CCW_FLAG_SLI;
1439
1440 if (IS_MPC(priv)) {
1441 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1442 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1443 ch->ccw[15].count = TH_HEADER_LENGTH;
1444 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1445
1446 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1447 ch->ccw[16].flags = CCW_FLAG_SLI;
1448
1449 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1450 ctc_ch_event_names, CTC_MPC_NR_STATES,
1451 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1452 mpc_ch_fsm_len, GFP_KERNEL);
1453 } else {
1454 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1455 ctc_ch_event_names, CTC_NR_STATES,
1456 CTC_NR_EVENTS, ch_fsm,
1457 ch_fsm_len, GFP_KERNEL);
1458 }
1459 if (ch->fsm == NULL)
1460 goto free_return;
1461
1462 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1463
1464 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1465 if (ch->irb == NULL)
1466 goto nomem_return;
1467
1468 while (*c && ctcm_less_than((*c)->id, ch->id))
1469 c = &(*c)->next;
1470
1471 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1472 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1473 "%s (%s) already in list, using old entry",
1474 __func__, (*c)->id);
1475
1476 goto free_return;
1477 }
1478
1479 spin_lock_init(&ch->collect_lock);
1480
1481 fsm_settimer(ch->fsm, &ch->timer);
1482 skb_queue_head_init(&ch->io_queue);
1483 skb_queue_head_init(&ch->collect_queue);
1484
1485 if (IS_MPC(priv)) {
1486 fsm_settimer(ch->fsm, &ch->sweep_timer);
1487 skb_queue_head_init(&ch->sweep_queue);
1488 }
1489 ch->next = *c;
1490 *c = ch;
1491 return 0;
1492
1493 nomem_return:
1494 rc = -ENOMEM;
1495
1496 free_return: /* note that all channel pointers are 0 or valid */
1497 kfree(ch->ccw);
1498 kfree(ch->discontact_th);
1499 kfree_fsm(ch->fsm);
1500 kfree(ch->irb);
1501 kfree(ch);
1502 return rc;
1503 }
1504
1505 /*
1506 * Return type of a detected device.
1507 */
1508 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1509 {
1510 enum ctcm_channel_types type;
1511 type = (enum ctcm_channel_types)id->driver_info;
1512
1513 if (type == ctcm_channel_type_ficon)
1514 type = ctcm_channel_type_escon;
1515
1516 return type;
1517 }
1518
1519 /**
1520 *
1521 * Setup an interface.
1522 *
1523 * cgdev Device to be setup.
1524 *
1525 * returns 0 on success, !0 on failure.
1526 */
1527 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1528 {
1529 char read_id[CTCM_ID_SIZE];
1530 char write_id[CTCM_ID_SIZE];
1531 int direction;
1532 enum ctcm_channel_types type;
1533 struct ctcm_priv *priv;
1534 struct net_device *dev;
1535 struct ccw_device *cdev0;
1536 struct ccw_device *cdev1;
1537 struct channel *readc;
1538 struct channel *writec;
1539 int ret;
1540 int result;
1541
1542 priv = dev_get_drvdata(&cgdev->dev);
1543 if (!priv) {
1544 result = -ENODEV;
1545 goto out_err_result;
1546 }
1547
1548 cdev0 = cgdev->cdev[0];
1549 cdev1 = cgdev->cdev[1];
1550
1551 type = get_channel_type(&cdev0->id);
1552
1553 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1554 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1555
1556 ret = add_channel(cdev0, type, priv);
1557 if (ret) {
1558 result = ret;
1559 goto out_err_result;
1560 }
1561 ret = add_channel(cdev1, type, priv);
1562 if (ret) {
1563 result = ret;
1564 goto out_remove_channel1;
1565 }
1566
1567 ret = ccw_device_set_online(cdev0);
1568 if (ret != 0) {
1569 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1570 "%s(%s) set_online rc=%d",
1571 CTCM_FUNTAIL, read_id, ret);
1572 result = -EIO;
1573 goto out_remove_channel2;
1574 }
1575
1576 ret = ccw_device_set_online(cdev1);
1577 if (ret != 0) {
1578 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1579 "%s(%s) set_online rc=%d",
1580 CTCM_FUNTAIL, write_id, ret);
1581
1582 result = -EIO;
1583 goto out_ccw1;
1584 }
1585
1586 dev = ctcm_init_netdevice(priv);
1587 if (dev == NULL) {
1588 result = -ENODEV;
1589 goto out_ccw2;
1590 }
1591
1592 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1593 priv->channel[direction] =
1594 channel_get(type, direction == CTCM_READ ?
1595 read_id : write_id, direction);
1596 if (priv->channel[direction] == NULL) {
1597 if (direction == CTCM_WRITE)
1598 channel_free(priv->channel[CTCM_READ]);
1599 goto out_dev;
1600 }
1601 priv->channel[direction]->netdev = dev;
1602 priv->channel[direction]->protocol = priv->protocol;
1603 priv->channel[direction]->max_bufsize = priv->buffer_size;
1604 }
1605 /* sysfs magic */
1606 SET_NETDEV_DEV(dev, &cgdev->dev);
1607
1608 if (register_netdev(dev)) {
1609 result = -ENODEV;
1610 goto out_dev;
1611 }
1612
1613 if (ctcm_add_attributes(&cgdev->dev)) {
1614 result = -ENODEV;
1615 goto out_unregister;
1616 }
1617
1618 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1619
1620 dev_info(&dev->dev,
1621 "setup OK : r/w = %s/%s, protocol : %d\n",
1622 priv->channel[CTCM_READ]->id,
1623 priv->channel[CTCM_WRITE]->id, priv->protocol);
1624
1625 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1626 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1627 priv->channel[CTCM_READ]->id,
1628 priv->channel[CTCM_WRITE]->id, priv->protocol);
1629
1630 return 0;
1631 out_unregister:
1632 unregister_netdev(dev);
1633 out_dev:
1634 ctcm_free_netdevice(dev);
1635 out_ccw2:
1636 ccw_device_set_offline(cgdev->cdev[1]);
1637 out_ccw1:
1638 ccw_device_set_offline(cgdev->cdev[0]);
1639 out_remove_channel2:
1640 readc = channel_get(type, read_id, CTCM_READ);
1641 channel_remove(readc);
1642 out_remove_channel1:
1643 writec = channel_get(type, write_id, CTCM_WRITE);
1644 channel_remove(writec);
1645 out_err_result:
1646 return result;
1647 }
1648
1649 /**
1650 * Shutdown an interface.
1651 *
1652 * cgdev Device to be shut down.
1653 *
1654 * returns 0 on success, !0 on failure.
1655 */
1656 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1657 {
1658 struct ctcm_priv *priv;
1659 struct net_device *dev;
1660
1661 priv = dev_get_drvdata(&cgdev->dev);
1662 if (!priv)
1663 return -ENODEV;
1664
1665 if (priv->channel[CTCM_READ]) {
1666 dev = priv->channel[CTCM_READ]->netdev;
1667 CTCM_DBF_DEV(SETUP, dev, "");
1668 /* Close the device */
1669 ctcm_close(dev);
1670 dev->flags &= ~IFF_RUNNING;
1671 ctcm_remove_attributes(&cgdev->dev);
1672 channel_free(priv->channel[CTCM_READ]);
1673 } else
1674 dev = NULL;
1675
1676 if (priv->channel[CTCM_WRITE])
1677 channel_free(priv->channel[CTCM_WRITE]);
1678
1679 if (dev) {
1680 unregister_netdev(dev);
1681 ctcm_free_netdevice(dev);
1682 }
1683
1684 if (priv->fsm)
1685 kfree_fsm(priv->fsm);
1686
1687 ccw_device_set_offline(cgdev->cdev[1]);
1688 ccw_device_set_offline(cgdev->cdev[0]);
1689
1690 if (priv->channel[CTCM_READ])
1691 channel_remove(priv->channel[CTCM_READ]);
1692 if (priv->channel[CTCM_WRITE])
1693 channel_remove(priv->channel[CTCM_WRITE]);
1694 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1695
1696 return 0;
1697
1698 }
1699
1700
1701 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1702 {
1703 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1704
1705 BUG_ON(priv == NULL);
1706
1707 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1708 "removing device %p, proto : %d",
1709 cgdev, priv->protocol);
1710
1711 if (cgdev->state == CCWGROUP_ONLINE)
1712 ctcm_shutdown_device(cgdev);
1713 ctcm_remove_files(&cgdev->dev);
1714 dev_set_drvdata(&cgdev->dev, NULL);
1715 kfree(priv);
1716 put_device(&cgdev->dev);
1717 }
1718
1719 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1720 {
1721 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1722
1723 if (gdev->state == CCWGROUP_OFFLINE)
1724 return 0;
1725 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1726 ctcm_close(priv->channel[CTCM_READ]->netdev);
1727 if (!wait_event_timeout(priv->fsm->wait_q,
1728 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1729 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1730 return -EBUSY;
1731 }
1732 ccw_device_set_offline(gdev->cdev[1]);
1733 ccw_device_set_offline(gdev->cdev[0]);
1734 return 0;
1735 }
1736
1737 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1738 {
1739 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1740 int rc;
1741
1742 if (gdev->state == CCWGROUP_OFFLINE)
1743 return 0;
1744 rc = ccw_device_set_online(gdev->cdev[1]);
1745 if (rc)
1746 goto err_out;
1747 rc = ccw_device_set_online(gdev->cdev[0]);
1748 if (rc)
1749 goto err_out;
1750 ctcm_open(priv->channel[CTCM_READ]->netdev);
1751 err_out:
1752 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1753 return rc;
1754 }
1755
1756 static struct ccw_device_id ctcm_ids[] = {
1757 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1758 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1759 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1760 {},
1761 };
1762 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1763
1764 static struct ccw_driver ctcm_ccw_driver = {
1765 .driver = {
1766 .owner = THIS_MODULE,
1767 .name = "ctcm",
1768 },
1769 .ids = ctcm_ids,
1770 .probe = ccwgroup_probe_ccwdev,
1771 .remove = ccwgroup_remove_ccwdev,
1772 };
1773
1774 static struct ccwgroup_driver ctcm_group_driver = {
1775 .driver = {
1776 .owner = THIS_MODULE,
1777 .name = CTC_DRIVER_NAME,
1778 },
1779 .max_slaves = 2,
1780 .driver_id = 0xC3E3C3D4, /* CTCM */
1781 .probe = ctcm_probe_device,
1782 .remove = ctcm_remove_device,
1783 .set_online = ctcm_new_device,
1784 .set_offline = ctcm_shutdown_device,
1785 .freeze = ctcm_pm_suspend,
1786 .thaw = ctcm_pm_resume,
1787 .restore = ctcm_pm_resume,
1788 };
1789
1790 static ssize_t
1791 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1792 size_t count)
1793 {
1794 int err;
1795
1796 err = ccwgroup_create_from_string(ctcm_root_dev,
1797 ctcm_group_driver.driver_id,
1798 &ctcm_ccw_driver, 2, buf);
1799 return err ? err : count;
1800 }
1801
1802 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1803
1804 static struct attribute *ctcm_group_attrs[] = {
1805 &driver_attr_group.attr,
1806 NULL,
1807 };
1808
1809 static struct attribute_group ctcm_group_attr_group = {
1810 .attrs = ctcm_group_attrs,
1811 };
1812
1813 static const struct attribute_group *ctcm_group_attr_groups[] = {
1814 &ctcm_group_attr_group,
1815 NULL,
1816 };
1817
1818 /*
1819 * Module related routines
1820 */
1821
1822 /*
1823 * Prepare to be unloaded. Free IRQ's and release all resources.
1824 * This is called just before this module is unloaded. It is
1825 * not called, if the usage count is !0, so we don't need to check
1826 * for that.
1827 */
1828 static void __exit ctcm_exit(void)
1829 {
1830 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1831 ccwgroup_driver_unregister(&ctcm_group_driver);
1832 ccw_driver_unregister(&ctcm_ccw_driver);
1833 root_device_unregister(ctcm_root_dev);
1834 ctcm_unregister_dbf_views();
1835 pr_info("CTCM driver unloaded\n");
1836 }
1837
1838 /*
1839 * Print Banner.
1840 */
1841 static void print_banner(void)
1842 {
1843 pr_info("CTCM driver initialized\n");
1844 }
1845
1846 /**
1847 * Initialize module.
1848 * This is called just after the module is loaded.
1849 *
1850 * returns 0 on success, !0 on error.
1851 */
1852 static int __init ctcm_init(void)
1853 {
1854 int ret;
1855
1856 channels = NULL;
1857
1858 ret = ctcm_register_dbf_views();
1859 if (ret)
1860 goto out_err;
1861 ctcm_root_dev = root_device_register("ctcm");
1862 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1863 if (ret)
1864 goto register_err;
1865 ret = ccw_driver_register(&ctcm_ccw_driver);
1866 if (ret)
1867 goto ccw_err;
1868 ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1869 ret = ccwgroup_driver_register(&ctcm_group_driver);
1870 if (ret)
1871 goto ccwgroup_err;
1872 print_banner();
1873 return 0;
1874
1875 ccwgroup_err:
1876 ccw_driver_unregister(&ctcm_ccw_driver);
1877 ccw_err:
1878 root_device_unregister(ctcm_root_dev);
1879 register_err:
1880 ctcm_unregister_dbf_views();
1881 out_err:
1882 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1883 __func__, ret);
1884 return ret;
1885 }
1886
1887 module_init(ctcm_init);
1888 module_exit(ctcm_exit);
1889
1890 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1891 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1892 MODULE_LICENSE("GPL");
1893
Mirror of the linux-mips.org kernel tree