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[pohmelfs.git] / drivers / s390 / net / ctcm_main.c
blob5cb93a8e340326b5a23a4d6e3c3e64a75b09749b
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/module.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/interrupt.h>
34 #include <linux/timer.h>
35 #include <linux/bitops.h>
36
37 #include <linux/signal.h>
38 #include <linux/string.h>
39
40 #include <linux/ip.h>
41 #include <linux/if_arp.h>
42 #include <linux/tcp.h>
43 #include <linux/skbuff.h>
44 #include <linux/ctype.h>
45 #include <net/dst.h>
46
47 #include <linux/io.h>
48 #include <asm/ccwdev.h>
49 #include <asm/ccwgroup.h>
50 #include <linux/uaccess.h>
51
52 #include <asm/idals.h>
53
54 #include "ctcm_fsms.h"
55 #include "ctcm_main.h"
56
57 /* Some common global variables */
58
59 /**
60 * The root device for ctcm group devices
61 */
62 static struct device *ctcm_root_dev;
63
64 /*
65 * Linked list of all detected channels.
66 */
67 struct channel *channels;
68
69 /**
70 * Unpack a just received skb and hand it over to
71 * upper layers.
72 *
73 * ch The channel where this skb has been received.
74 * pskb The received skb.
75 */
76 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
77 {
78 struct net_device *dev = ch->netdev;
79 struct ctcm_priv *priv = dev->ml_priv;
80 __u16 len = *((__u16 *) pskb->data);
81
82 skb_put(pskb, 2 + LL_HEADER_LENGTH);
83 skb_pull(pskb, 2);
84 pskb->dev = dev;
85 pskb->ip_summed = CHECKSUM_UNNECESSARY;
86 while (len > 0) {
87 struct sk_buff *skb;
88 int skblen;
89 struct ll_header *header = (struct ll_header *)pskb->data;
90
91 skb_pull(pskb, LL_HEADER_LENGTH);
92 if ((ch->protocol == CTCM_PROTO_S390) &&
93 (header->type != ETH_P_IP)) {
94 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
95 ch->logflags |= LOG_FLAG_ILLEGALPKT;
96 /*
97 * Check packet type only if we stick strictly
98 * to S/390's protocol of OS390. This only
99 * supports IP. Otherwise allow any packet
100 * type.
101 */
102 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
103 "%s(%s): Illegal packet type 0x%04x"
104 " - dropping",
105 CTCM_FUNTAIL, dev->name, header->type);
106 }
107 priv->stats.rx_dropped++;
108 priv->stats.rx_frame_errors++;
109 return;
110 }
111 pskb->protocol = ntohs(header->type);
112 if ((header->length <= LL_HEADER_LENGTH) ||
113 (len <= LL_HEADER_LENGTH)) {
114 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
115 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
116 "%s(%s): Illegal packet size %d(%d,%d)"
117 "- dropping",
118 CTCM_FUNTAIL, dev->name,
119 header->length, dev->mtu, len);
120 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
121 }
122
123 priv->stats.rx_dropped++;
124 priv->stats.rx_length_errors++;
125 return;
126 }
127 header->length -= LL_HEADER_LENGTH;
128 len -= LL_HEADER_LENGTH;
129 if ((header->length > skb_tailroom(pskb)) ||
130 (header->length > len)) {
131 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
132 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
133 "%s(%s): Packet size %d (overrun)"
134 " - dropping", CTCM_FUNTAIL,
135 dev->name, header->length);
136 ch->logflags |= LOG_FLAG_OVERRUN;
137 }
138
139 priv->stats.rx_dropped++;
140 priv->stats.rx_length_errors++;
141 return;
142 }
143 skb_put(pskb, header->length);
144 skb_reset_mac_header(pskb);
145 len -= header->length;
146 skb = dev_alloc_skb(pskb->len);
147 if (!skb) {
148 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
149 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
150 "%s(%s): MEMORY allocation error",
151 CTCM_FUNTAIL, dev->name);
152 ch->logflags |= LOG_FLAG_NOMEM;
153 }
154 priv->stats.rx_dropped++;
155 return;
156 }
157 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
158 pskb->len);
159 skb_reset_mac_header(skb);
160 skb->dev = pskb->dev;
161 skb->protocol = pskb->protocol;
162 pskb->ip_summed = CHECKSUM_UNNECESSARY;
163 skblen = skb->len;
164 /*
165 * reset logflags
166 */
167 ch->logflags = 0;
168 priv->stats.rx_packets++;
169 priv->stats.rx_bytes += skblen;
170 netif_rx_ni(skb);
171 if (len > 0) {
172 skb_pull(pskb, header->length);
173 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
174 CTCM_DBF_DEV_NAME(TRACE, dev,
175 "Overrun in ctcm_unpack_skb");
176 ch->logflags |= LOG_FLAG_OVERRUN;
177 return;
178 }
179 skb_put(pskb, LL_HEADER_LENGTH);
180 }
181 }
182 }
183
184 /**
185 * Release a specific channel in the channel list.
186 *
187 * ch Pointer to channel struct to be released.
188 */
189 static void channel_free(struct channel *ch)
190 {
191 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
192 ch->flags &= ~CHANNEL_FLAGS_INUSE;
193 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
194 }
195
196 /**
197 * Remove a specific channel in the channel list.
198 *
199 * ch Pointer to channel struct to be released.
200 */
201 static void channel_remove(struct channel *ch)
202 {
203 struct channel **c = &channels;
204 char chid[CTCM_ID_SIZE+1];
205 int ok = 0;
206
207 if (ch == NULL)
208 return;
209 else
210 strncpy(chid, ch->id, CTCM_ID_SIZE);
211
212 channel_free(ch);
213 while (*c) {
214 if (*c == ch) {
215 *c = ch->next;
216 fsm_deltimer(&ch->timer);
217 if (IS_MPC(ch))
218 fsm_deltimer(&ch->sweep_timer);
219
220 kfree_fsm(ch->fsm);
221 clear_normalized_cda(&ch->ccw[4]);
222 if (ch->trans_skb != NULL) {
223 clear_normalized_cda(&ch->ccw[1]);
224 dev_kfree_skb_any(ch->trans_skb);
225 }
226 if (IS_MPC(ch)) {
227 tasklet_kill(&ch->ch_tasklet);
228 tasklet_kill(&ch->ch_disc_tasklet);
229 kfree(ch->discontact_th);
230 }
231 kfree(ch->ccw);
232 kfree(ch->irb);
233 kfree(ch);
234 ok = 1;
235 break;
236 }
237 c = &((*c)->next);
238 }
239
240 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
241 chid, ok ? "OK" : "failed");
242 }
243
244 /**
245 * Get a specific channel from the channel list.
246 *
247 * type Type of channel we are interested in.
248 * id Id of channel we are interested in.
249 * direction Direction we want to use this channel for.
250 *
251 * returns Pointer to a channel or NULL if no matching channel available.
252 */
253 static struct channel *channel_get(enum ctcm_channel_types type,
254 char *id, int direction)
255 {
256 struct channel *ch = channels;
257
258 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
259 ch = ch->next;
260 if (!ch) {
261 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
262 "%s(%d, %s, %d) not found in channel list\n",
263 CTCM_FUNTAIL, type, id, direction);
264 } else {
265 if (ch->flags & CHANNEL_FLAGS_INUSE)
266 ch = NULL;
267 else {
268 ch->flags |= CHANNEL_FLAGS_INUSE;
269 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
270 ch->flags |= (direction == CTCM_WRITE)
271 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
272 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
273 }
274 }
275 return ch;
276 }
277
278 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
279 {
280 if (!IS_ERR(irb))
281 return 0;
282
283 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
284 "irb error %ld on device %s\n",
285 PTR_ERR(irb), dev_name(&cdev->dev));
286
287 switch (PTR_ERR(irb)) {
288 case -EIO:
289 dev_err(&cdev->dev,
290 "An I/O-error occurred on the CTCM device\n");
291 break;
292 case -ETIMEDOUT:
293 dev_err(&cdev->dev,
294 "An adapter hardware operation timed out\n");
295 break;
296 default:
297 dev_err(&cdev->dev,
298 "An error occurred on the adapter hardware\n");
299 }
300 return PTR_ERR(irb);
301 }
302
303
304 /**
305 * Check sense of a unit check.
306 *
307 * ch The channel, the sense code belongs to.
308 * sense The sense code to inspect.
309 */
310 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
311 {
312 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
313 "%s(%s): %02x",
314 CTCM_FUNTAIL, ch->id, sense);
315
316 if (sense & SNS0_INTERVENTION_REQ) {
317 if (sense & 0x01) {
318 if (ch->sense_rc != 0x01) {
319 pr_notice(
320 "%s: The communication peer has "
321 "disconnected\n", ch->id);
322 ch->sense_rc = 0x01;
323 }
324 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
325 } else {
326 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
327 pr_notice(
328 "%s: The remote operating system is "
329 "not available\n", ch->id);
330 ch->sense_rc = SNS0_INTERVENTION_REQ;
331 }
332 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
333 }
334 } else if (sense & SNS0_EQUIPMENT_CHECK) {
335 if (sense & SNS0_BUS_OUT_CHECK) {
336 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
337 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
338 "%s(%s): remote HW error %02x",
339 CTCM_FUNTAIL, ch->id, sense);
340 ch->sense_rc = SNS0_BUS_OUT_CHECK;
341 }
342 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
343 } else {
344 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
345 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
346 "%s(%s): remote read parity error %02x",
347 CTCM_FUNTAIL, ch->id, sense);
348 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
349 }
350 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
351 }
352 } else if (sense & SNS0_BUS_OUT_CHECK) {
353 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
354 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
355 "%s(%s): BUS OUT error %02x",
356 CTCM_FUNTAIL, ch->id, sense);
357 ch->sense_rc = SNS0_BUS_OUT_CHECK;
358 }
359 if (sense & 0x04) /* data-streaming timeout */
360 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
361 else /* Data-transfer parity error */
362 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
363 } else if (sense & SNS0_CMD_REJECT) {
364 if (ch->sense_rc != SNS0_CMD_REJECT) {
365 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
366 "%s(%s): Command rejected",
367 CTCM_FUNTAIL, ch->id);
368 ch->sense_rc = SNS0_CMD_REJECT;
369 }
370 } else if (sense == 0) {
371 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
372 "%s(%s): Unit check ZERO",
373 CTCM_FUNTAIL, ch->id);
374 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
375 } else {
376 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
377 "%s(%s): Unit check code %02x unknown",
378 CTCM_FUNTAIL, ch->id, sense);
379 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
380 }
381 }
382
383 int ctcm_ch_alloc_buffer(struct channel *ch)
384 {
385 clear_normalized_cda(&ch->ccw[1]);
386 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
387 if (ch->trans_skb == NULL) {
388 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
389 "%s(%s): %s trans_skb allocation error",
390 CTCM_FUNTAIL, ch->id,
391 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
392 "RX" : "TX");
393 return -ENOMEM;
394 }
395
396 ch->ccw[1].count = ch->max_bufsize;
397 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
398 dev_kfree_skb(ch->trans_skb);
399 ch->trans_skb = NULL;
400 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
401 "%s(%s): %s set norm_cda failed",
402 CTCM_FUNTAIL, ch->id,
403 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
404 "RX" : "TX");
405 return -ENOMEM;
406 }
407
408 ch->ccw[1].count = 0;
409 ch->trans_skb_data = ch->trans_skb->data;
410 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
411 return 0;
412 }
413
414 /*
415 * Interface API for upper network layers
416 */
417
418 /**
419 * Open an interface.
420 * Called from generic network layer when ifconfig up is run.
421 *
422 * dev Pointer to interface struct.
423 *
424 * returns 0 on success, -ERRNO on failure. (Never fails.)
425 */
426 int ctcm_open(struct net_device *dev)
427 {
428 struct ctcm_priv *priv = dev->ml_priv;
429
430 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
431 if (!IS_MPC(priv))
432 fsm_event(priv->fsm, DEV_EVENT_START, dev);
433 return 0;
434 }
435
436 /**
437 * Close an interface.
438 * Called from generic network layer when ifconfig down is run.
439 *
440 * dev Pointer to interface struct.
441 *
442 * returns 0 on success, -ERRNO on failure. (Never fails.)
443 */
444 int ctcm_close(struct net_device *dev)
445 {
446 struct ctcm_priv *priv = dev->ml_priv;
447
448 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
449 if (!IS_MPC(priv))
450 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
451 return 0;
452 }
453
454
455 /**
456 * Transmit a packet.
457 * This is a helper function for ctcm_tx().
458 *
459 * ch Channel to be used for sending.
460 * skb Pointer to struct sk_buff of packet to send.
461 * The linklevel header has already been set up
462 * by ctcm_tx().
463 *
464 * returns 0 on success, -ERRNO on failure. (Never fails.)
465 */
466 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
467 {
468 unsigned long saveflags;
469 struct ll_header header;
470 int rc = 0;
471 __u16 block_len;
472 int ccw_idx;
473 struct sk_buff *nskb;
474 unsigned long hi;
475
476 /* we need to acquire the lock for testing the state
477 * otherwise we can have an IRQ changing the state to
478 * TXIDLE after the test but before acquiring the lock.
479 */
480 spin_lock_irqsave(&ch->collect_lock, saveflags);
481 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
482 int l = skb->len + LL_HEADER_LENGTH;
483
484 if (ch->collect_len + l > ch->max_bufsize - 2) {
485 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
486 return -EBUSY;
487 } else {
488 atomic_inc(&skb->users);
489 header.length = l;
490 header.type = skb->protocol;
491 header.unused = 0;
492 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
493 LL_HEADER_LENGTH);
494 skb_queue_tail(&ch->collect_queue, skb);
495 ch->collect_len += l;
496 }
497 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
498 goto done;
499 }
500 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
501 /*
502 * Protect skb against beeing free'd by upper
503 * layers.
504 */
505 atomic_inc(&skb->users);
506 ch->prof.txlen += skb->len;
507 header.length = skb->len + LL_HEADER_LENGTH;
508 header.type = skb->protocol;
509 header.unused = 0;
510 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
511 block_len = skb->len + 2;
512 *((__u16 *)skb_push(skb, 2)) = block_len;
513
514 /*
515 * IDAL support in CTCM is broken, so we have to
516 * care about skb's above 2G ourselves.
517 */
518 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
519 if (hi) {
520 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
521 if (!nskb) {
522 atomic_dec(&skb->users);
523 skb_pull(skb, LL_HEADER_LENGTH + 2);
524 ctcm_clear_busy(ch->netdev);
525 return -ENOMEM;
526 } else {
527 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
528 atomic_inc(&nskb->users);
529 atomic_dec(&skb->users);
530 dev_kfree_skb_irq(skb);
531 skb = nskb;
532 }
533 }
534
535 ch->ccw[4].count = block_len;
536 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
537 /*
538 * idal allocation failed, try via copying to
539 * trans_skb. trans_skb usually has a pre-allocated
540 * idal.
541 */
542 if (ctcm_checkalloc_buffer(ch)) {
543 /*
544 * Remove our header. It gets added
545 * again on retransmit.
546 */
547 atomic_dec(&skb->users);
548 skb_pull(skb, LL_HEADER_LENGTH + 2);
549 ctcm_clear_busy(ch->netdev);
550 return -ENOMEM;
551 }
552
553 skb_reset_tail_pointer(ch->trans_skb);
554 ch->trans_skb->len = 0;
555 ch->ccw[1].count = skb->len;
556 skb_copy_from_linear_data(skb,
557 skb_put(ch->trans_skb, skb->len), skb->len);
558 atomic_dec(&skb->users);
559 dev_kfree_skb_irq(skb);
560 ccw_idx = 0;
561 } else {
562 skb_queue_tail(&ch->io_queue, skb);
563 ccw_idx = 3;
564 }
565 ch->retry = 0;
566 fsm_newstate(ch->fsm, CTC_STATE_TX);
567 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
568 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
569 ch->prof.send_stamp = current_kernel_time(); /* xtime */
570 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
571 (unsigned long)ch, 0xff, 0);
572 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
573 if (ccw_idx == 3)
574 ch->prof.doios_single++;
575 if (rc != 0) {
576 fsm_deltimer(&ch->timer);
577 ctcm_ccw_check_rc(ch, rc, "single skb TX");
578 if (ccw_idx == 3)
579 skb_dequeue_tail(&ch->io_queue);
580 /*
581 * Remove our header. It gets added
582 * again on retransmit.
583 */
584 skb_pull(skb, LL_HEADER_LENGTH + 2);
585 } else if (ccw_idx == 0) {
586 struct net_device *dev = ch->netdev;
587 struct ctcm_priv *priv = dev->ml_priv;
588 priv->stats.tx_packets++;
589 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
590 }
591 done:
592 ctcm_clear_busy(ch->netdev);
593 return rc;
594 }
595
596 static void ctcmpc_send_sweep_req(struct channel *rch)
597 {
598 struct net_device *dev = rch->netdev;
599 struct ctcm_priv *priv;
600 struct mpc_group *grp;
601 struct th_sweep *header;
602 struct sk_buff *sweep_skb;
603 struct channel *ch;
604 /* int rc = 0; */
605
606 priv = dev->ml_priv;
607 grp = priv->mpcg;
608 ch = priv->channel[CTCM_WRITE];
609
610 /* sweep processing is not complete until response and request */
611 /* has completed for all read channels in group */
612 if (grp->in_sweep == 0) {
613 grp->in_sweep = 1;
614 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
615 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
616 }
617
618 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
619
620 if (sweep_skb == NULL) {
621 /* rc = -ENOMEM; */
622 goto nomem;
623 }
624
625 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
626
627 if (!header) {
628 dev_kfree_skb_any(sweep_skb);
629 /* rc = -ENOMEM; */
630 goto nomem;
631 }
632
633 header->th.th_seg = 0x00 ;
634 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
635 header->th.th_blk_flag = 0x00;
636 header->th.th_is_xid = 0x00;
637 header->th.th_seq_num = 0x00;
638 header->sw.th_last_seq = ch->th_seq_num;
639
640 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
641
642 kfree(header);
643
644 dev->trans_start = jiffies;
645 skb_queue_tail(&ch->sweep_queue, sweep_skb);
646
647 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
648
649 return;
650
651 nomem:
652 grp->in_sweep = 0;
653 ctcm_clear_busy(dev);
654 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
655
656 return;
657 }
658
659 /*
660 * MPC mode version of transmit_skb
661 */
662 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
663 {
664 struct pdu *p_header;
665 struct net_device *dev = ch->netdev;
666 struct ctcm_priv *priv = dev->ml_priv;
667 struct mpc_group *grp = priv->mpcg;
668 struct th_header *header;
669 struct sk_buff *nskb;
670 int rc = 0;
671 int ccw_idx;
672 unsigned long hi;
673 unsigned long saveflags = 0; /* avoids compiler warning */
674
675 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
676 __func__, dev->name, smp_processor_id(), ch,
677 ch->id, fsm_getstate_str(ch->fsm));
678
679 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
680 spin_lock_irqsave(&ch->collect_lock, saveflags);
681 atomic_inc(&skb->users);
682 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
683
684 if (!p_header) {
685 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
686 goto nomem_exit;
687 }
688
689 p_header->pdu_offset = skb->len;
690 p_header->pdu_proto = 0x01;
691 p_header->pdu_flag = 0x00;
692 if (skb->protocol == ntohs(ETH_P_SNAP)) {
693 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
694 } else {
695 p_header->pdu_flag |= PDU_FIRST;
696 }
697 p_header->pdu_seq = 0;
698 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
699 PDU_HEADER_LENGTH);
700
701 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
702 "pdu header and data for up to 32 bytes:\n",
703 __func__, dev->name, skb->len);
704 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
705
706 skb_queue_tail(&ch->collect_queue, skb);
707 ch->collect_len += skb->len;
708 kfree(p_header);
709
710 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
711 goto done;
712 }
713
714 /*
715 * Protect skb against beeing free'd by upper
716 * layers.
717 */
718 atomic_inc(&skb->users);
719
720 /*
721 * IDAL support in CTCM is broken, so we have to
722 * care about skb's above 2G ourselves.
723 */
724 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
725 if (hi) {
726 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
727 if (!nskb) {
728 goto nomem_exit;
729 } else {
730 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
731 atomic_inc(&nskb->users);
732 atomic_dec(&skb->users);
733 dev_kfree_skb_irq(skb);
734 skb = nskb;
735 }
736 }
737
738 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
739
740 if (!p_header)
741 goto nomem_exit;
742
743 p_header->pdu_offset = skb->len;
744 p_header->pdu_proto = 0x01;
745 p_header->pdu_flag = 0x00;
746 p_header->pdu_seq = 0;
747 if (skb->protocol == ntohs(ETH_P_SNAP)) {
748 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
749 } else {
750 p_header->pdu_flag |= PDU_FIRST;
751 }
752 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
753
754 kfree(p_header);
755
756 if (ch->collect_len > 0) {
757 spin_lock_irqsave(&ch->collect_lock, saveflags);
758 skb_queue_tail(&ch->collect_queue, skb);
759 ch->collect_len += skb->len;
760 skb = skb_dequeue(&ch->collect_queue);
761 ch->collect_len -= skb->len;
762 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
763 }
764
765 p_header = (struct pdu *)skb->data;
766 p_header->pdu_flag |= PDU_LAST;
767
768 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
769
770 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
771 if (!header)
772 goto nomem_exit;
773
774 header->th_seg = 0x00;
775 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
776 header->th_blk_flag = 0x00;
777 header->th_is_xid = 0x00; /* Just data here */
778 ch->th_seq_num++;
779 header->th_seq_num = ch->th_seq_num;
780
781 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
782 __func__, dev->name, ch->th_seq_num);
783
784 /* put the TH on the packet */
785 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
786
787 kfree(header);
788
789 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
790 "up to 32 bytes sent to vtam:\n",
791 __func__, dev->name, skb->len);
792 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
793
794 ch->ccw[4].count = skb->len;
795 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
796 /*
797 * idal allocation failed, try via copying to trans_skb.
798 * trans_skb usually has a pre-allocated idal.
799 */
800 if (ctcm_checkalloc_buffer(ch)) {
801 /*
802 * Remove our header.
803 * It gets added again on retransmit.
804 */
805 goto nomem_exit;
806 }
807
808 skb_reset_tail_pointer(ch->trans_skb);
809 ch->trans_skb->len = 0;
810 ch->ccw[1].count = skb->len;
811 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
812 atomic_dec(&skb->users);
813 dev_kfree_skb_irq(skb);
814 ccw_idx = 0;
815 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
816 "up to 32 bytes sent to vtam:\n",
817 __func__, dev->name, ch->trans_skb->len);
818 CTCM_D3_DUMP((char *)ch->trans_skb->data,
819 min_t(int, 32, ch->trans_skb->len));
820 } else {
821 skb_queue_tail(&ch->io_queue, skb);
822 ccw_idx = 3;
823 }
824 ch->retry = 0;
825 fsm_newstate(ch->fsm, CTC_STATE_TX);
826 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
827
828 if (do_debug_ccw)
829 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
830 sizeof(struct ccw1) * 3);
831
832 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
833 ch->prof.send_stamp = current_kernel_time(); /* xtime */
834 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
835 (unsigned long)ch, 0xff, 0);
836 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
837 if (ccw_idx == 3)
838 ch->prof.doios_single++;
839 if (rc != 0) {
840 fsm_deltimer(&ch->timer);
841 ctcm_ccw_check_rc(ch, rc, "single skb TX");
842 if (ccw_idx == 3)
843 skb_dequeue_tail(&ch->io_queue);
844 } else if (ccw_idx == 0) {
845 priv->stats.tx_packets++;
846 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
847 }
848 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
849 ctcmpc_send_sweep_req(ch);
850
851 goto done;
852 nomem_exit:
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
854 "%s(%s): MEMORY allocation ERROR\n",
855 CTCM_FUNTAIL, ch->id);
856 rc = -ENOMEM;
857 atomic_dec(&skb->users);
858 dev_kfree_skb_any(skb);
859 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
860 done:
861 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
862 return rc;
863 }
864
865 /**
866 * Start transmission of a packet.
867 * Called from generic network device layer.
868 *
869 * skb Pointer to buffer containing the packet.
870 * dev Pointer to interface struct.
871 *
872 * returns 0 if packet consumed, !0 if packet rejected.
873 * Note: If we return !0, then the packet is free'd by
874 * the generic network layer.
875 */
876 /* first merge version - leaving both functions separated */
877 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
878 {
879 struct ctcm_priv *priv = dev->ml_priv;
880
881 if (skb == NULL) {
882 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
883 "%s(%s): NULL sk_buff passed",
884 CTCM_FUNTAIL, dev->name);
885 priv->stats.tx_dropped++;
886 return NETDEV_TX_OK;
887 }
888 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
889 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
890 "%s(%s): Got sk_buff with head room < %ld bytes",
891 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
892 dev_kfree_skb(skb);
893 priv->stats.tx_dropped++;
894 return NETDEV_TX_OK;
895 }
896
897 /*
898 * If channels are not running, try to restart them
899 * and throw away packet.
900 */
901 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
902 fsm_event(priv->fsm, DEV_EVENT_START, dev);
903 dev_kfree_skb(skb);
904 priv->stats.tx_dropped++;
905 priv->stats.tx_errors++;
906 priv->stats.tx_carrier_errors++;
907 return NETDEV_TX_OK;
908 }
909
910 if (ctcm_test_and_set_busy(dev))
911 return NETDEV_TX_BUSY;
912
913 dev->trans_start = jiffies;
914 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
915 return NETDEV_TX_BUSY;
916 return NETDEV_TX_OK;
917 }
918
919 /* unmerged MPC variant of ctcm_tx */
920 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
921 {
922 int len = 0;
923 struct ctcm_priv *priv = dev->ml_priv;
924 struct mpc_group *grp = priv->mpcg;
925 struct sk_buff *newskb = NULL;
926
927 /*
928 * Some sanity checks ...
929 */
930 if (skb == NULL) {
931 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
932 "%s(%s): NULL sk_buff passed",
933 CTCM_FUNTAIL, dev->name);
934 priv->stats.tx_dropped++;
935 goto done;
936 }
937 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
938 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
939 "%s(%s): Got sk_buff with head room < %ld bytes",
940 CTCM_FUNTAIL, dev->name,
941 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
942
943 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
944
945 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
946 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
947
948 if (!newskb) {
949 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
950 "%s: %s: __dev_alloc_skb failed",
951 __func__, dev->name);
952
953 dev_kfree_skb_any(skb);
954 priv->stats.tx_dropped++;
955 priv->stats.tx_errors++;
956 priv->stats.tx_carrier_errors++;
957 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
958 goto done;
959 }
960 newskb->protocol = skb->protocol;
961 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
962 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
963 dev_kfree_skb_any(skb);
964 skb = newskb;
965 }
966
967 /*
968 * If channels are not running,
969 * notify anybody about a link failure and throw
970 * away packet.
971 */
972 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
973 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
974 dev_kfree_skb_any(skb);
975 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
976 "%s(%s): inactive MPCGROUP - dropped",
977 CTCM_FUNTAIL, dev->name);
978 priv->stats.tx_dropped++;
979 priv->stats.tx_errors++;
980 priv->stats.tx_carrier_errors++;
981 goto done;
982 }
983
984 if (ctcm_test_and_set_busy(dev)) {
985 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
986 "%s(%s): device busy - dropped",
987 CTCM_FUNTAIL, dev->name);
988 dev_kfree_skb_any(skb);
989 priv->stats.tx_dropped++;
990 priv->stats.tx_errors++;
991 priv->stats.tx_carrier_errors++;
992 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
993 goto done;
994 }
995
996 dev->trans_start = jiffies;
997 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
998 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
999 "%s(%s): device error - dropped",
1000 CTCM_FUNTAIL, dev->name);
1001 dev_kfree_skb_any(skb);
1002 priv->stats.tx_dropped++;
1003 priv->stats.tx_errors++;
1004 priv->stats.tx_carrier_errors++;
1005 ctcm_clear_busy(dev);
1006 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1007 goto done;
1008 }
1009 ctcm_clear_busy(dev);
1010 done:
1011 if (do_debug)
1012 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1013
1014 return NETDEV_TX_OK; /* handle freeing of skb here */
1015 }
1016
1017
1018 /**
1019 * Sets MTU of an interface.
1020 *
1021 * dev Pointer to interface struct.
1022 * new_mtu The new MTU to use for this interface.
1023 *
1024 * returns 0 on success, -EINVAL if MTU is out of valid range.
1025 * (valid range is 576 .. 65527). If VM is on the
1026 * remote side, maximum MTU is 32760, however this is
1027 * not checked here.
1028 */
1029 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1030 {
1031 struct ctcm_priv *priv;
1032 int max_bufsize;
1033
1034 if (new_mtu < 576 || new_mtu > 65527)
1035 return -EINVAL;
1036
1037 priv = dev->ml_priv;
1038 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1039
1040 if (IS_MPC(priv)) {
1041 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1042 return -EINVAL;
1043 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1044 } else {
1045 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1046 return -EINVAL;
1047 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1048 }
1049 dev->mtu = new_mtu;
1050 return 0;
1051 }
1052
1053 /**
1054 * Returns interface statistics of a device.
1055 *
1056 * dev Pointer to interface struct.
1057 *
1058 * returns Pointer to stats struct of this interface.
1059 */
1060 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1061 {
1062 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1063 }
1064
1065 static void ctcm_free_netdevice(struct net_device *dev)
1066 {
1067 struct ctcm_priv *priv;
1068 struct mpc_group *grp;
1069
1070 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1071 "%s(%s)", CTCM_FUNTAIL, dev->name);
1072 priv = dev->ml_priv;
1073 if (priv) {
1074 grp = priv->mpcg;
1075 if (grp) {
1076 if (grp->fsm)
1077 kfree_fsm(grp->fsm);
1078 if (grp->xid_skb)
1079 dev_kfree_skb(grp->xid_skb);
1080 if (grp->rcvd_xid_skb)
1081 dev_kfree_skb(grp->rcvd_xid_skb);
1082 tasklet_kill(&grp->mpc_tasklet2);
1083 kfree(grp);
1084 priv->mpcg = NULL;
1085 }
1086 if (priv->fsm) {
1087 kfree_fsm(priv->fsm);
1088 priv->fsm = NULL;
1089 }
1090 kfree(priv->xid);
1091 priv->xid = NULL;
1092 /*
1093 * Note: kfree(priv); is done in "opposite" function of
1094 * allocator function probe_device which is remove_device.
1095 */
1096 }
1097 #ifdef MODULE
1098 free_netdev(dev);
1099 #endif
1100 }
1101
1102 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1103
1104 static const struct net_device_ops ctcm_netdev_ops = {
1105 .ndo_open = ctcm_open,
1106 .ndo_stop = ctcm_close,
1107 .ndo_get_stats = ctcm_stats,
1108 .ndo_change_mtu = ctcm_change_mtu,
1109 .ndo_start_xmit = ctcm_tx,
1110 };
1111
1112 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1113 .ndo_open = ctcm_open,
1114 .ndo_stop = ctcm_close,
1115 .ndo_get_stats = ctcm_stats,
1116 .ndo_change_mtu = ctcm_change_mtu,
1117 .ndo_start_xmit = ctcmpc_tx,
1118 };
1119
1120 void static ctcm_dev_setup(struct net_device *dev)
1121 {
1122 dev->type = ARPHRD_SLIP;
1123 dev->tx_queue_len = 100;
1124 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1125 }
1126
1127 /*
1128 * Initialize everything of the net device except the name and the
1129 * channel structs.
1130 */
1131 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1132 {
1133 struct net_device *dev;
1134 struct mpc_group *grp;
1135 if (!priv)
1136 return NULL;
1137
1138 if (IS_MPC(priv))
1139 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1140 else
1141 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1142
1143 if (!dev) {
1144 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1145 "%s: MEMORY allocation ERROR",
1146 CTCM_FUNTAIL);
1147 return NULL;
1148 }
1149 dev->ml_priv = priv;
1150 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1151 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1152 dev_fsm, dev_fsm_len, GFP_KERNEL);
1153 if (priv->fsm == NULL) {
1154 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1155 free_netdev(dev);
1156 return NULL;
1157 }
1158 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1159 fsm_settimer(priv->fsm, &priv->restart_timer);
1160
1161 if (IS_MPC(priv)) {
1162 /* MPC Group Initializations */
1163 grp = ctcmpc_init_mpc_group(priv);
1164 if (grp == NULL) {
1165 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1166 free_netdev(dev);
1167 return NULL;
1168 }
1169 tasklet_init(&grp->mpc_tasklet2,
1170 mpc_group_ready, (unsigned long)dev);
1171 dev->mtu = MPC_BUFSIZE_DEFAULT -
1172 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1173
1174 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1175 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1176 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1177 } else {
1178 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1179 dev->netdev_ops = &ctcm_netdev_ops;
1180 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1181 }
1182
1183 CTCMY_DBF_DEV(SETUP, dev, "finished");
1184
1185 return dev;
1186 }
1187
1188 /**
1189 * Main IRQ handler.
1190 *
1191 * cdev The ccw_device the interrupt is for.
1192 * intparm interruption parameter.
1193 * irb interruption response block.
1194 */
1195 static void ctcm_irq_handler(struct ccw_device *cdev,
1196 unsigned long intparm, struct irb *irb)
1197 {
1198 struct channel *ch;
1199 struct net_device *dev;
1200 struct ctcm_priv *priv;
1201 struct ccwgroup_device *cgdev;
1202 int cstat;
1203 int dstat;
1204
1205 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1206 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1207
1208 if (ctcm_check_irb_error(cdev, irb))
1209 return;
1210
1211 cgdev = dev_get_drvdata(&cdev->dev);
1212
1213 cstat = irb->scsw.cmd.cstat;
1214 dstat = irb->scsw.cmd.dstat;
1215
1216 /* Check for unsolicited interrupts. */
1217 if (cgdev == NULL) {
1218 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1219 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1220 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1221 dev_warn(&cdev->dev,
1222 "The adapter received a non-specific IRQ\n");
1223 return;
1224 }
1225
1226 priv = dev_get_drvdata(&cgdev->dev);
1227
1228 /* Try to extract channel from driver data. */
1229 if (priv->channel[CTCM_READ]->cdev == cdev)
1230 ch = priv->channel[CTCM_READ];
1231 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1232 ch = priv->channel[CTCM_WRITE];
1233 else {
1234 dev_err(&cdev->dev,
1235 "%s: Internal error: Can't determine channel for "
1236 "interrupt device %s\n",
1237 __func__, dev_name(&cdev->dev));
1238 /* Explain: inconsistent internal structures */
1239 return;
1240 }
1241
1242 dev = ch->netdev;
1243 if (dev == NULL) {
1244 dev_err(&cdev->dev,
1245 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1246 __func__, ch);
1247 /* Explain: inconsistent internal structures */
1248 return;
1249 }
1250
1251 /* Copy interruption response block. */
1252 memcpy(ch->irb, irb, sizeof(struct irb));
1253
1254 /* Issue error message and return on subchannel error code */
1255 if (irb->scsw.cmd.cstat) {
1256 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1257 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1258 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1259 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1260 dev_warn(&cdev->dev,
1261 "A check occurred on the subchannel\n");
1262 return;
1263 }
1264
1265 /* Check the reason-code of a unit check */
1266 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1267 if ((irb->ecw[0] & ch->sense_rc) == 0)
1268 /* print it only once */
1269 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1270 "%s(%s): sense=%02x, ds=%02x",
1271 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1272 ccw_unit_check(ch, irb->ecw[0]);
1273 return;
1274 }
1275 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1276 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1277 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1278 else
1279 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1280 return;
1281 }
1282 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1283 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1284 return;
1285 }
1286 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1287 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1288 (irb->scsw.cmd.stctl ==
1289 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1290 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1291 else
1292 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1293
1294 }
1295
1296 /**
1297 * Add ctcm specific attributes.
1298 * Add ctcm private data.
1299 *
1300 * cgdev pointer to ccwgroup_device just added
1301 *
1302 * returns 0 on success, !0 on failure.
1303 */
1304 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1305 {
1306 struct ctcm_priv *priv;
1307 int rc;
1308
1309 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1310 "%s %p",
1311 __func__, cgdev);
1312
1313 if (!get_device(&cgdev->dev))
1314 return -ENODEV;
1315
1316 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1317 if (!priv) {
1318 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1319 "%s: memory allocation failure",
1320 CTCM_FUNTAIL);
1321 put_device(&cgdev->dev);
1322 return -ENOMEM;
1323 }
1324
1325 rc = ctcm_add_files(&cgdev->dev);
1326 if (rc) {
1327 kfree(priv);
1328 put_device(&cgdev->dev);
1329 return rc;
1330 }
1331 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1332 cgdev->cdev[0]->handler = ctcm_irq_handler;
1333 cgdev->cdev[1]->handler = ctcm_irq_handler;
1334 dev_set_drvdata(&cgdev->dev, priv);
1335
1336 return 0;
1337 }
1338
1339 /**
1340 * Add a new channel to the list of channels.
1341 * Keeps the channel list sorted.
1342 *
1343 * cdev The ccw_device to be added.
1344 * type The type class of the new channel.
1345 * priv Points to the private data of the ccwgroup_device.
1346 *
1347 * returns 0 on success, !0 on error.
1348 */
1349 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1350 struct ctcm_priv *priv)
1351 {
1352 struct channel **c = &channels;
1353 struct channel *ch;
1354 int ccw_num;
1355 int rc = 0;
1356
1357 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1358 "%s(%s), type %d, proto %d",
1359 __func__, dev_name(&cdev->dev), type, priv->protocol);
1360
1361 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1362 if (ch == NULL)
1363 return -ENOMEM;
1364
1365 ch->protocol = priv->protocol;
1366 if (IS_MPC(priv)) {
1367 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1368 if (ch->discontact_th == NULL)
1369 goto nomem_return;
1370
1371 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1372 tasklet_init(&ch->ch_disc_tasklet,
1373 mpc_action_send_discontact, (unsigned long)ch);
1374
1375 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1376 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1377 ccw_num = 17;
1378 } else
1379 ccw_num = 8;
1380
1381 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1382 if (ch->ccw == NULL)
1383 goto nomem_return;
1384
1385 ch->cdev = cdev;
1386 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1387 ch->type = type;
1388
1389 /**
1390 * "static" ccws are used in the following way:
1391 *
1392 * ccw[0..2] (Channel program for generic I/O):
1393 * 0: prepare
1394 * 1: read or write (depending on direction) with fixed
1395 * buffer (idal allocated once when buffer is allocated)
1396 * 2: nop
1397 * ccw[3..5] (Channel program for direct write of packets)
1398 * 3: prepare
1399 * 4: write (idal allocated on every write).
1400 * 5: nop
1401 * ccw[6..7] (Channel program for initial channel setup):
1402 * 6: set extended mode
1403 * 7: nop
1404 *
1405 * ch->ccw[0..5] are initialized in ch_action_start because
1406 * the channel's direction is yet unknown here.
1407 *
1408 * ccws used for xid2 negotiations
1409 * ch-ccw[8-14] need to be used for the XID exchange either
1410 * X side XID2 Processing
1411 * 8: write control
1412 * 9: write th
1413 * 10: write XID
1414 * 11: read th from secondary
1415 * 12: read XID from secondary
1416 * 13: read 4 byte ID
1417 * 14: nop
1418 * Y side XID Processing
1419 * 8: sense
1420 * 9: read th
1421 * 10: read XID
1422 * 11: write th
1423 * 12: write XID
1424 * 13: write 4 byte ID
1425 * 14: nop
1426 *
1427 * ccws used for double noop due to VM timing issues
1428 * which result in unrecoverable Busy on channel
1429 * 15: nop
1430 * 16: nop
1431 */
1432 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1433 ch->ccw[6].flags = CCW_FLAG_SLI;
1434
1435 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1436 ch->ccw[7].flags = CCW_FLAG_SLI;
1437
1438 if (IS_MPC(priv)) {
1439 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1440 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1441 ch->ccw[15].count = TH_HEADER_LENGTH;
1442 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1443
1444 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1445 ch->ccw[16].flags = CCW_FLAG_SLI;
1446
1447 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1448 ctc_ch_event_names, CTC_MPC_NR_STATES,
1449 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1450 mpc_ch_fsm_len, GFP_KERNEL);
1451 } else {
1452 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1453 ctc_ch_event_names, CTC_NR_STATES,
1454 CTC_NR_EVENTS, ch_fsm,
1455 ch_fsm_len, GFP_KERNEL);
1456 }
1457 if (ch->fsm == NULL)
1458 goto free_return;
1459
1460 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1461
1462 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1463 if (ch->irb == NULL)
1464 goto nomem_return;
1465
1466 while (*c && ctcm_less_than((*c)->id, ch->id))
1467 c = &(*c)->next;
1468
1469 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1470 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1471 "%s (%s) already in list, using old entry",
1472 __func__, (*c)->id);
1473
1474 goto free_return;
1475 }
1476
1477 spin_lock_init(&ch->collect_lock);
1478
1479 fsm_settimer(ch->fsm, &ch->timer);
1480 skb_queue_head_init(&ch->io_queue);
1481 skb_queue_head_init(&ch->collect_queue);
1482
1483 if (IS_MPC(priv)) {
1484 fsm_settimer(ch->fsm, &ch->sweep_timer);
1485 skb_queue_head_init(&ch->sweep_queue);
1486 }
1487 ch->next = *c;
1488 *c = ch;
1489 return 0;
1490
1491 nomem_return:
1492 rc = -ENOMEM;
1493
1494 free_return: /* note that all channel pointers are 0 or valid */
1495 kfree(ch->ccw);
1496 kfree(ch->discontact_th);
1497 kfree_fsm(ch->fsm);
1498 kfree(ch->irb);
1499 kfree(ch);
1500 return rc;
1501 }
1502
1503 /*
1504 * Return type of a detected device.
1505 */
1506 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1507 {
1508 enum ctcm_channel_types type;
1509 type = (enum ctcm_channel_types)id->driver_info;
1510
1511 if (type == ctcm_channel_type_ficon)
1512 type = ctcm_channel_type_escon;
1513
1514 return type;
1515 }
1516
1517 /**
1518 *
1519 * Setup an interface.
1520 *
1521 * cgdev Device to be setup.
1522 *
1523 * returns 0 on success, !0 on failure.
1524 */
1525 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1526 {
1527 char read_id[CTCM_ID_SIZE];
1528 char write_id[CTCM_ID_SIZE];
1529 int direction;
1530 enum ctcm_channel_types type;
1531 struct ctcm_priv *priv;
1532 struct net_device *dev;
1533 struct ccw_device *cdev0;
1534 struct ccw_device *cdev1;
1535 struct channel *readc;
1536 struct channel *writec;
1537 int ret;
1538 int result;
1539
1540 priv = dev_get_drvdata(&cgdev->dev);
1541 if (!priv) {
1542 result = -ENODEV;
1543 goto out_err_result;
1544 }
1545
1546 cdev0 = cgdev->cdev[0];
1547 cdev1 = cgdev->cdev[1];
1548
1549 type = get_channel_type(&cdev0->id);
1550
1551 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1552 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1553
1554 ret = add_channel(cdev0, type, priv);
1555 if (ret) {
1556 result = ret;
1557 goto out_err_result;
1558 }
1559 ret = add_channel(cdev1, type, priv);
1560 if (ret) {
1561 result = ret;
1562 goto out_remove_channel1;
1563 }
1564
1565 ret = ccw_device_set_online(cdev0);
1566 if (ret != 0) {
1567 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1568 "%s(%s) set_online rc=%d",
1569 CTCM_FUNTAIL, read_id, ret);
1570 result = -EIO;
1571 goto out_remove_channel2;
1572 }
1573
1574 ret = ccw_device_set_online(cdev1);
1575 if (ret != 0) {
1576 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1577 "%s(%s) set_online rc=%d",
1578 CTCM_FUNTAIL, write_id, ret);
1579
1580 result = -EIO;
1581 goto out_ccw1;
1582 }
1583
1584 dev = ctcm_init_netdevice(priv);
1585 if (dev == NULL) {
1586 result = -ENODEV;
1587 goto out_ccw2;
1588 }
1589
1590 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1591 priv->channel[direction] =
1592 channel_get(type, direction == CTCM_READ ?
1593 read_id : write_id, direction);
1594 if (priv->channel[direction] == NULL) {
1595 if (direction == CTCM_WRITE)
1596 channel_free(priv->channel[CTCM_READ]);
1597 goto out_dev;
1598 }
1599 priv->channel[direction]->netdev = dev;
1600 priv->channel[direction]->protocol = priv->protocol;
1601 priv->channel[direction]->max_bufsize = priv->buffer_size;
1602 }
1603 /* sysfs magic */
1604 SET_NETDEV_DEV(dev, &cgdev->dev);
1605
1606 if (register_netdev(dev)) {
1607 result = -ENODEV;
1608 goto out_dev;
1609 }
1610
1611 if (ctcm_add_attributes(&cgdev->dev)) {
1612 result = -ENODEV;
1613 goto out_unregister;
1614 }
1615
1616 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1617
1618 dev_info(&dev->dev,
1619 "setup OK : r/w = %s/%s, protocol : %d\n",
1620 priv->channel[CTCM_READ]->id,
1621 priv->channel[CTCM_WRITE]->id, priv->protocol);
1622
1623 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1624 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1625 priv->channel[CTCM_READ]->id,
1626 priv->channel[CTCM_WRITE]->id, priv->protocol);
1627
1628 return 0;
1629 out_unregister:
1630 unregister_netdev(dev);
1631 out_dev:
1632 ctcm_free_netdevice(dev);
1633 out_ccw2:
1634 ccw_device_set_offline(cgdev->cdev[1]);
1635 out_ccw1:
1636 ccw_device_set_offline(cgdev->cdev[0]);
1637 out_remove_channel2:
1638 readc = channel_get(type, read_id, CTCM_READ);
1639 channel_remove(readc);
1640 out_remove_channel1:
1641 writec = channel_get(type, write_id, CTCM_WRITE);
1642 channel_remove(writec);
1643 out_err_result:
1644 return result;
1645 }
1646
1647 /**
1648 * Shutdown an interface.
1649 *
1650 * cgdev Device to be shut down.
1651 *
1652 * returns 0 on success, !0 on failure.
1653 */
1654 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1655 {
1656 struct ctcm_priv *priv;
1657 struct net_device *dev;
1658
1659 priv = dev_get_drvdata(&cgdev->dev);
1660 if (!priv)
1661 return -ENODEV;
1662
1663 if (priv->channel[CTCM_READ]) {
1664 dev = priv->channel[CTCM_READ]->netdev;
1665 CTCM_DBF_DEV(SETUP, dev, "");
1666 /* Close the device */
1667 ctcm_close(dev);
1668 dev->flags &= ~IFF_RUNNING;
1669 ctcm_remove_attributes(&cgdev->dev);
1670 channel_free(priv->channel[CTCM_READ]);
1671 } else
1672 dev = NULL;
1673
1674 if (priv->channel[CTCM_WRITE])
1675 channel_free(priv->channel[CTCM_WRITE]);
1676
1677 if (dev) {
1678 unregister_netdev(dev);
1679 ctcm_free_netdevice(dev);
1680 }
1681
1682 if (priv->fsm)
1683 kfree_fsm(priv->fsm);
1684
1685 ccw_device_set_offline(cgdev->cdev[1]);
1686 ccw_device_set_offline(cgdev->cdev[0]);
1687
1688 if (priv->channel[CTCM_READ])
1689 channel_remove(priv->channel[CTCM_READ]);
1690 if (priv->channel[CTCM_WRITE])
1691 channel_remove(priv->channel[CTCM_WRITE]);
1692 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1693
1694 return 0;
1695
1696 }
1697
1698
1699 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1700 {
1701 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1702
1703 BUG_ON(priv == NULL);
1704
1705 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1706 "removing device %p, proto : %d",
1707 cgdev, priv->protocol);
1708
1709 if (cgdev->state == CCWGROUP_ONLINE)
1710 ctcm_shutdown_device(cgdev);
1711 ctcm_remove_files(&cgdev->dev);
1712 dev_set_drvdata(&cgdev->dev, NULL);
1713 kfree(priv);
1714 put_device(&cgdev->dev);
1715 }
1716
1717 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1718 {
1719 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1720
1721 if (gdev->state == CCWGROUP_OFFLINE)
1722 return 0;
1723 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1724 ctcm_close(priv->channel[CTCM_READ]->netdev);
1725 if (!wait_event_timeout(priv->fsm->wait_q,
1726 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1727 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1728 return -EBUSY;
1729 }
1730 ccw_device_set_offline(gdev->cdev[1]);
1731 ccw_device_set_offline(gdev->cdev[0]);
1732 return 0;
1733 }
1734
1735 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1736 {
1737 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1738 int rc;
1739
1740 if (gdev->state == CCWGROUP_OFFLINE)
1741 return 0;
1742 rc = ccw_device_set_online(gdev->cdev[1]);
1743 if (rc)
1744 goto err_out;
1745 rc = ccw_device_set_online(gdev->cdev[0]);
1746 if (rc)
1747 goto err_out;
1748 ctcm_open(priv->channel[CTCM_READ]->netdev);
1749 err_out:
1750 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1751 return rc;
1752 }
1753
1754 static struct ccw_device_id ctcm_ids[] = {
1755 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1756 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1757 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1758 {},
1759 };
1760 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1761
1762 static struct ccw_driver ctcm_ccw_driver = {
1763 .driver = {
1764 .owner = THIS_MODULE,
1765 .name = "ctcm",
1766 },
1767 .ids = ctcm_ids,
1768 .probe = ccwgroup_probe_ccwdev,
1769 .remove = ccwgroup_remove_ccwdev,
1770 .int_class = IOINT_CTC,
1771 };
1772
1773 static struct ccwgroup_driver ctcm_group_driver = {
1774 .driver = {
1775 .owner = THIS_MODULE,
1776 .name = CTC_DRIVER_NAME,
1777 },
1778 .max_slaves = 2,
1779 .driver_id = 0xC3E3C3D4, /* CTCM */
1780 .probe = ctcm_probe_device,
1781 .remove = ctcm_remove_device,
1782 .set_online = ctcm_new_device,
1783 .set_offline = ctcm_shutdown_device,
1784 .freeze = ctcm_pm_suspend,
1785 .thaw = ctcm_pm_resume,
1786 .restore = ctcm_pm_resume,
1787 };
1788
1789 static ssize_t
1790 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1791 size_t count)
1792 {
1793 int err;
1794
1795 err = ccwgroup_create_from_string(ctcm_root_dev,
1796 ctcm_group_driver.driver_id,
1797 &ctcm_ccw_driver, 2, buf);
1798 return err ? err : count;
1799 }
1800
1801 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1802
1803 static struct attribute *ctcm_group_attrs[] = {
1804 &driver_attr_group.attr,
1805 NULL,
1806 };
1807
1808 static struct attribute_group ctcm_group_attr_group = {
1809 .attrs = ctcm_group_attrs,
1810 };
1811
1812 static const struct attribute_group *ctcm_group_attr_groups[] = {
1813 &ctcm_group_attr_group,
1814 NULL,
1815 };
1816
1817 /*
1818 * Module related routines
1819 */
1820
1821 /*
1822 * Prepare to be unloaded. Free IRQ's and release all resources.
1823 * This is called just before this module is unloaded. It is
1824 * not called, if the usage count is !0, so we don't need to check
1825 * for that.
1826 */
1827 static void __exit ctcm_exit(void)
1828 {
1829 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1830 ccwgroup_driver_unregister(&ctcm_group_driver);
1831 ccw_driver_unregister(&ctcm_ccw_driver);
1832 root_device_unregister(ctcm_root_dev);
1833 ctcm_unregister_dbf_views();
1834 pr_info("CTCM driver unloaded\n");
1835 }
1836
1837 /*
1838 * Print Banner.
1839 */
1840 static void print_banner(void)
1841 {
1842 pr_info("CTCM driver initialized\n");
1843 }
1844
1845 /**
1846 * Initialize module.
1847 * This is called just after the module is loaded.
1848 *
1849 * returns 0 on success, !0 on error.
1850 */
1851 static int __init ctcm_init(void)
1852 {
1853 int ret;
1854
1855 channels = NULL;
1856
1857 ret = ctcm_register_dbf_views();
1858 if (ret)
1859 goto out_err;
1860 ctcm_root_dev = root_device_register("ctcm");
1861 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1862 if (ret)
1863 goto register_err;
1864 ret = ccw_driver_register(&ctcm_ccw_driver);
1865 if (ret)
1866 goto ccw_err;
1867 ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1868 ret = ccwgroup_driver_register(&ctcm_group_driver);
1869 if (ret)
1870 goto ccwgroup_err;
1871 print_banner();
1872 return 0;
1873
1874 ccwgroup_err:
1875 ccw_driver_unregister(&ctcm_ccw_driver);
1876 ccw_err:
1877 root_device_unregister(ctcm_root_dev);
1878 register_err:
1879 ctcm_unregister_dbf_views();
1880 out_err:
1881 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1882 __func__, ret);
1883 return ret;
1884 }
1885
1886 module_init(ctcm_init);
1887 module_exit(ctcm_exit);
1888
1889 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1890 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1891 MODULE_LICENSE("GPL");
1892