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ocfs2: Make the left masklogs compat.
[taoma-kernel.git] / drivers / s390 / net / ctcm_main.c
blob4c28459859276dd8ebf0d3dbab55d4a3eeca4e24
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 __u16 block_len;
676
677 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
678 __func__, dev->name, smp_processor_id(), ch,
679 ch->id, fsm_getstate_str(ch->fsm));
680
681 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
682 spin_lock_irqsave(&ch->collect_lock, saveflags);
683 atomic_inc(&skb->users);
684 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
685
686 if (!p_header) {
687 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
688 goto nomem_exit;
689 }
690
691 p_header->pdu_offset = skb->len;
692 p_header->pdu_proto = 0x01;
693 p_header->pdu_flag = 0x00;
694 if (skb->protocol == ntohs(ETH_P_SNAP)) {
695 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
696 } else {
697 p_header->pdu_flag |= PDU_FIRST;
698 }
699 p_header->pdu_seq = 0;
700 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
701 PDU_HEADER_LENGTH);
702
703 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
704 "pdu header and data for up to 32 bytes:\n",
705 __func__, dev->name, skb->len);
706 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
707
708 skb_queue_tail(&ch->collect_queue, skb);
709 ch->collect_len += skb->len;
710 kfree(p_header);
711
712 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
713 goto done;
714 }
715
716 /*
717 * Protect skb against beeing free'd by upper
718 * layers.
719 */
720 atomic_inc(&skb->users);
721
722 block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
723 /*
724 * IDAL support in CTCM is broken, so we have to
725 * care about skb's above 2G ourselves.
726 */
727 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
728 if (hi) {
729 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
730 if (!nskb) {
731 goto nomem_exit;
732 } else {
733 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
734 atomic_inc(&nskb->users);
735 atomic_dec(&skb->users);
736 dev_kfree_skb_irq(skb);
737 skb = nskb;
738 }
739 }
740
741 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
742
743 if (!p_header)
744 goto nomem_exit;
745
746 p_header->pdu_offset = skb->len;
747 p_header->pdu_proto = 0x01;
748 p_header->pdu_flag = 0x00;
749 p_header->pdu_seq = 0;
750 if (skb->protocol == ntohs(ETH_P_SNAP)) {
751 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
752 } else {
753 p_header->pdu_flag |= PDU_FIRST;
754 }
755 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
756
757 kfree(p_header);
758
759 if (ch->collect_len > 0) {
760 spin_lock_irqsave(&ch->collect_lock, saveflags);
761 skb_queue_tail(&ch->collect_queue, skb);
762 ch->collect_len += skb->len;
763 skb = skb_dequeue(&ch->collect_queue);
764 ch->collect_len -= skb->len;
765 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
766 }
767
768 p_header = (struct pdu *)skb->data;
769 p_header->pdu_flag |= PDU_LAST;
770
771 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
772
773 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
774 if (!header)
775 goto nomem_exit;
776
777 header->th_seg = 0x00;
778 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
779 header->th_blk_flag = 0x00;
780 header->th_is_xid = 0x00; /* Just data here */
781 ch->th_seq_num++;
782 header->th_seq_num = ch->th_seq_num;
783
784 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
785 __func__, dev->name, ch->th_seq_num);
786
787 /* put the TH on the packet */
788 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
789
790 kfree(header);
791
792 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
793 "up to 32 bytes sent to vtam:\n",
794 __func__, dev->name, skb->len);
795 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
796
797 ch->ccw[4].count = skb->len;
798 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
799 /*
800 * idal allocation failed, try via copying to trans_skb.
801 * trans_skb usually has a pre-allocated idal.
802 */
803 if (ctcm_checkalloc_buffer(ch)) {
804 /*
805 * Remove our header.
806 * It gets added again on retransmit.
807 */
808 goto nomem_exit;
809 }
810
811 skb_reset_tail_pointer(ch->trans_skb);
812 ch->trans_skb->len = 0;
813 ch->ccw[1].count = skb->len;
814 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
815 atomic_dec(&skb->users);
816 dev_kfree_skb_irq(skb);
817 ccw_idx = 0;
818 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
819 "up to 32 bytes sent to vtam:\n",
820 __func__, dev->name, ch->trans_skb->len);
821 CTCM_D3_DUMP((char *)ch->trans_skb->data,
822 min_t(int, 32, ch->trans_skb->len));
823 } else {
824 skb_queue_tail(&ch->io_queue, skb);
825 ccw_idx = 3;
826 }
827 ch->retry = 0;
828 fsm_newstate(ch->fsm, CTC_STATE_TX);
829 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
830
831 if (do_debug_ccw)
832 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
833 sizeof(struct ccw1) * 3);
834
835 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
836 ch->prof.send_stamp = current_kernel_time(); /* xtime */
837 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
838 (unsigned long)ch, 0xff, 0);
839 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
840 if (ccw_idx == 3)
841 ch->prof.doios_single++;
842 if (rc != 0) {
843 fsm_deltimer(&ch->timer);
844 ctcm_ccw_check_rc(ch, rc, "single skb TX");
845 if (ccw_idx == 3)
846 skb_dequeue_tail(&ch->io_queue);
847 } else if (ccw_idx == 0) {
848 priv->stats.tx_packets++;
849 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
850 }
851 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
852 ctcmpc_send_sweep_req(ch);
853
854 goto done;
855 nomem_exit:
856 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
857 "%s(%s): MEMORY allocation ERROR\n",
858 CTCM_FUNTAIL, ch->id);
859 rc = -ENOMEM;
860 atomic_dec(&skb->users);
861 dev_kfree_skb_any(skb);
862 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
863 done:
864 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
865 return rc;
866 }
867
868 /**
869 * Start transmission of a packet.
870 * Called from generic network device layer.
871 *
872 * skb Pointer to buffer containing the packet.
873 * dev Pointer to interface struct.
874 *
875 * returns 0 if packet consumed, !0 if packet rejected.
876 * Note: If we return !0, then the packet is free'd by
877 * the generic network layer.
878 */
879 /* first merge version - leaving both functions separated */
880 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
881 {
882 struct ctcm_priv *priv = dev->ml_priv;
883
884 if (skb == NULL) {
885 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
886 "%s(%s): NULL sk_buff passed",
887 CTCM_FUNTAIL, dev->name);
888 priv->stats.tx_dropped++;
889 return NETDEV_TX_OK;
890 }
891 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
892 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
893 "%s(%s): Got sk_buff with head room < %ld bytes",
894 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
895 dev_kfree_skb(skb);
896 priv->stats.tx_dropped++;
897 return NETDEV_TX_OK;
898 }
899
900 /*
901 * If channels are not running, try to restart them
902 * and throw away packet.
903 */
904 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
905 fsm_event(priv->fsm, DEV_EVENT_START, dev);
906 dev_kfree_skb(skb);
907 priv->stats.tx_dropped++;
908 priv->stats.tx_errors++;
909 priv->stats.tx_carrier_errors++;
910 return NETDEV_TX_OK;
911 }
912
913 if (ctcm_test_and_set_busy(dev))
914 return NETDEV_TX_BUSY;
915
916 dev->trans_start = jiffies;
917 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
918 return NETDEV_TX_BUSY;
919 return NETDEV_TX_OK;
920 }
921
922 /* unmerged MPC variant of ctcm_tx */
923 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
924 {
925 int len = 0;
926 struct ctcm_priv *priv = dev->ml_priv;
927 struct mpc_group *grp = priv->mpcg;
928 struct sk_buff *newskb = NULL;
929
930 /*
931 * Some sanity checks ...
932 */
933 if (skb == NULL) {
934 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
935 "%s(%s): NULL sk_buff passed",
936 CTCM_FUNTAIL, dev->name);
937 priv->stats.tx_dropped++;
938 goto done;
939 }
940 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
941 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
942 "%s(%s): Got sk_buff with head room < %ld bytes",
943 CTCM_FUNTAIL, dev->name,
944 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
945
946 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
947
948 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
949 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
950
951 if (!newskb) {
952 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
953 "%s: %s: __dev_alloc_skb failed",
954 __func__, dev->name);
955
956 dev_kfree_skb_any(skb);
957 priv->stats.tx_dropped++;
958 priv->stats.tx_errors++;
959 priv->stats.tx_carrier_errors++;
960 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
961 goto done;
962 }
963 newskb->protocol = skb->protocol;
964 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
965 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
966 dev_kfree_skb_any(skb);
967 skb = newskb;
968 }
969
970 /*
971 * If channels are not running,
972 * notify anybody about a link failure and throw
973 * away packet.
974 */
975 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
976 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
977 dev_kfree_skb_any(skb);
978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
979 "%s(%s): inactive MPCGROUP - dropped",
980 CTCM_FUNTAIL, dev->name);
981 priv->stats.tx_dropped++;
982 priv->stats.tx_errors++;
983 priv->stats.tx_carrier_errors++;
984 goto done;
985 }
986
987 if (ctcm_test_and_set_busy(dev)) {
988 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
989 "%s(%s): device busy - dropped",
990 CTCM_FUNTAIL, dev->name);
991 dev_kfree_skb_any(skb);
992 priv->stats.tx_dropped++;
993 priv->stats.tx_errors++;
994 priv->stats.tx_carrier_errors++;
995 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
996 goto done;
997 }
998
999 dev->trans_start = jiffies;
1000 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
1001 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1002 "%s(%s): device error - dropped",
1003 CTCM_FUNTAIL, dev->name);
1004 dev_kfree_skb_any(skb);
1005 priv->stats.tx_dropped++;
1006 priv->stats.tx_errors++;
1007 priv->stats.tx_carrier_errors++;
1008 ctcm_clear_busy(dev);
1009 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1010 goto done;
1011 }
1012 ctcm_clear_busy(dev);
1013 done:
1014 if (do_debug)
1015 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1016
1017 return NETDEV_TX_OK; /* handle freeing of skb here */
1018 }
1019
1020
1021 /**
1022 * Sets MTU of an interface.
1023 *
1024 * dev Pointer to interface struct.
1025 * new_mtu The new MTU to use for this interface.
1026 *
1027 * returns 0 on success, -EINVAL if MTU is out of valid range.
1028 * (valid range is 576 .. 65527). If VM is on the
1029 * remote side, maximum MTU is 32760, however this is
1030 * not checked here.
1031 */
1032 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1033 {
1034 struct ctcm_priv *priv;
1035 int max_bufsize;
1036
1037 if (new_mtu < 576 || new_mtu > 65527)
1038 return -EINVAL;
1039
1040 priv = dev->ml_priv;
1041 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1042
1043 if (IS_MPC(priv)) {
1044 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1045 return -EINVAL;
1046 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1047 } else {
1048 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1049 return -EINVAL;
1050 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1051 }
1052 dev->mtu = new_mtu;
1053 return 0;
1054 }
1055
1056 /**
1057 * Returns interface statistics of a device.
1058 *
1059 * dev Pointer to interface struct.
1060 *
1061 * returns Pointer to stats struct of this interface.
1062 */
1063 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1064 {
1065 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1066 }
1067
1068 static void ctcm_free_netdevice(struct net_device *dev)
1069 {
1070 struct ctcm_priv *priv;
1071 struct mpc_group *grp;
1072
1073 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1074 "%s(%s)", CTCM_FUNTAIL, dev->name);
1075 priv = dev->ml_priv;
1076 if (priv) {
1077 grp = priv->mpcg;
1078 if (grp) {
1079 if (grp->fsm)
1080 kfree_fsm(grp->fsm);
1081 if (grp->xid_skb)
1082 dev_kfree_skb(grp->xid_skb);
1083 if (grp->rcvd_xid_skb)
1084 dev_kfree_skb(grp->rcvd_xid_skb);
1085 tasklet_kill(&grp->mpc_tasklet2);
1086 kfree(grp);
1087 priv->mpcg = NULL;
1088 }
1089 if (priv->fsm) {
1090 kfree_fsm(priv->fsm);
1091 priv->fsm = NULL;
1092 }
1093 kfree(priv->xid);
1094 priv->xid = NULL;
1095 /*
1096 * Note: kfree(priv); is done in "opposite" function of
1097 * allocator function probe_device which is remove_device.
1098 */
1099 }
1100 #ifdef MODULE
1101 free_netdev(dev);
1102 #endif
1103 }
1104
1105 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1106
1107 static const struct net_device_ops ctcm_netdev_ops = {
1108 .ndo_open = ctcm_open,
1109 .ndo_stop = ctcm_close,
1110 .ndo_get_stats = ctcm_stats,
1111 .ndo_change_mtu = ctcm_change_mtu,
1112 .ndo_start_xmit = ctcm_tx,
1113 };
1114
1115 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1116 .ndo_open = ctcm_open,
1117 .ndo_stop = ctcm_close,
1118 .ndo_get_stats = ctcm_stats,
1119 .ndo_change_mtu = ctcm_change_mtu,
1120 .ndo_start_xmit = ctcmpc_tx,
1121 };
1122
1123 void static ctcm_dev_setup(struct net_device *dev)
1124 {
1125 dev->type = ARPHRD_SLIP;
1126 dev->tx_queue_len = 100;
1127 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1128 }
1129
1130 /*
1131 * Initialize everything of the net device except the name and the
1132 * channel structs.
1133 */
1134 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1135 {
1136 struct net_device *dev;
1137 struct mpc_group *grp;
1138 if (!priv)
1139 return NULL;
1140
1141 if (IS_MPC(priv))
1142 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1143 else
1144 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1145
1146 if (!dev) {
1147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1148 "%s: MEMORY allocation ERROR",
1149 CTCM_FUNTAIL);
1150 return NULL;
1151 }
1152 dev->ml_priv = priv;
1153 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1154 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1155 dev_fsm, dev_fsm_len, GFP_KERNEL);
1156 if (priv->fsm == NULL) {
1157 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1158 free_netdev(dev);
1159 return NULL;
1160 }
1161 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1162 fsm_settimer(priv->fsm, &priv->restart_timer);
1163
1164 if (IS_MPC(priv)) {
1165 /* MPC Group Initializations */
1166 grp = ctcmpc_init_mpc_group(priv);
1167 if (grp == NULL) {
1168 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1169 free_netdev(dev);
1170 return NULL;
1171 }
1172 tasklet_init(&grp->mpc_tasklet2,
1173 mpc_group_ready, (unsigned long)dev);
1174 dev->mtu = MPC_BUFSIZE_DEFAULT -
1175 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1176
1177 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1178 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1179 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1180 } else {
1181 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1182 dev->netdev_ops = &ctcm_netdev_ops;
1183 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1184 }
1185
1186 CTCMY_DBF_DEV(SETUP, dev, "finished");
1187
1188 return dev;
1189 }
1190
1191 /**
1192 * Main IRQ handler.
1193 *
1194 * cdev The ccw_device the interrupt is for.
1195 * intparm interruption parameter.
1196 * irb interruption response block.
1197 */
1198 static void ctcm_irq_handler(struct ccw_device *cdev,
1199 unsigned long intparm, struct irb *irb)
1200 {
1201 struct channel *ch;
1202 struct net_device *dev;
1203 struct ctcm_priv *priv;
1204 struct ccwgroup_device *cgdev;
1205 int cstat;
1206 int dstat;
1207
1208 kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
1209 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1210 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1211
1212 if (ctcm_check_irb_error(cdev, irb))
1213 return;
1214
1215 cgdev = dev_get_drvdata(&cdev->dev);
1216
1217 cstat = irb->scsw.cmd.cstat;
1218 dstat = irb->scsw.cmd.dstat;
1219
1220 /* Check for unsolicited interrupts. */
1221 if (cgdev == NULL) {
1222 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1223 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1224 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1225 dev_warn(&cdev->dev,
1226 "The adapter received a non-specific IRQ\n");
1227 return;
1228 }
1229
1230 priv = dev_get_drvdata(&cgdev->dev);
1231
1232 /* Try to extract channel from driver data. */
1233 if (priv->channel[CTCM_READ]->cdev == cdev)
1234 ch = priv->channel[CTCM_READ];
1235 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1236 ch = priv->channel[CTCM_WRITE];
1237 else {
1238 dev_err(&cdev->dev,
1239 "%s: Internal error: Can't determine channel for "
1240 "interrupt device %s\n",
1241 __func__, dev_name(&cdev->dev));
1242 /* Explain: inconsistent internal structures */
1243 return;
1244 }
1245
1246 dev = ch->netdev;
1247 if (dev == NULL) {
1248 dev_err(&cdev->dev,
1249 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1250 __func__, ch);
1251 /* Explain: inconsistent internal structures */
1252 return;
1253 }
1254
1255 /* Copy interruption response block. */
1256 memcpy(ch->irb, irb, sizeof(struct irb));
1257
1258 /* Issue error message and return on subchannel error code */
1259 if (irb->scsw.cmd.cstat) {
1260 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1261 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1262 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1263 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1264 dev_warn(&cdev->dev,
1265 "A check occurred on the subchannel\n");
1266 return;
1267 }
1268
1269 /* Check the reason-code of a unit check */
1270 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1271 if ((irb->ecw[0] & ch->sense_rc) == 0)
1272 /* print it only once */
1273 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1274 "%s(%s): sense=%02x, ds=%02x",
1275 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1276 ccw_unit_check(ch, irb->ecw[0]);
1277 return;
1278 }
1279 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1280 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1281 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1282 else
1283 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1284 return;
1285 }
1286 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1287 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1288 return;
1289 }
1290 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1291 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1292 (irb->scsw.cmd.stctl ==
1293 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1294 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1295 else
1296 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1297
1298 }
1299
1300 /**
1301 * Add ctcm specific attributes.
1302 * Add ctcm private data.
1303 *
1304 * cgdev pointer to ccwgroup_device just added
1305 *
1306 * returns 0 on success, !0 on failure.
1307 */
1308 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1309 {
1310 struct ctcm_priv *priv;
1311 int rc;
1312
1313 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1314 "%s %p",
1315 __func__, cgdev);
1316
1317 if (!get_device(&cgdev->dev))
1318 return -ENODEV;
1319
1320 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1321 if (!priv) {
1322 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1323 "%s: memory allocation failure",
1324 CTCM_FUNTAIL);
1325 put_device(&cgdev->dev);
1326 return -ENOMEM;
1327 }
1328
1329 rc = ctcm_add_files(&cgdev->dev);
1330 if (rc) {
1331 kfree(priv);
1332 put_device(&cgdev->dev);
1333 return rc;
1334 }
1335 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1336 cgdev->cdev[0]->handler = ctcm_irq_handler;
1337 cgdev->cdev[1]->handler = ctcm_irq_handler;
1338 dev_set_drvdata(&cgdev->dev, priv);
1339
1340 return 0;
1341 }
1342
1343 /**
1344 * Add a new channel to the list of channels.
1345 * Keeps the channel list sorted.
1346 *
1347 * cdev The ccw_device to be added.
1348 * type The type class of the new channel.
1349 * priv Points to the private data of the ccwgroup_device.
1350 *
1351 * returns 0 on success, !0 on error.
1352 */
1353 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1354 struct ctcm_priv *priv)
1355 {
1356 struct channel **c = &channels;
1357 struct channel *ch;
1358 int ccw_num;
1359 int rc = 0;
1360
1361 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1362 "%s(%s), type %d, proto %d",
1363 __func__, dev_name(&cdev->dev), type, priv->protocol);
1364
1365 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1366 if (ch == NULL)
1367 return -ENOMEM;
1368
1369 ch->protocol = priv->protocol;
1370 if (IS_MPC(priv)) {
1371 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1372 if (ch->discontact_th == NULL)
1373 goto nomem_return;
1374
1375 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1376 tasklet_init(&ch->ch_disc_tasklet,
1377 mpc_action_send_discontact, (unsigned long)ch);
1378
1379 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1380 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1381 ccw_num = 17;
1382 } else
1383 ccw_num = 8;
1384
1385 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1386 if (ch->ccw == NULL)
1387 goto nomem_return;
1388
1389 ch->cdev = cdev;
1390 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1391 ch->type = type;
1392
1393 /**
1394 * "static" ccws are used in the following way:
1395 *
1396 * ccw[0..2] (Channel program for generic I/O):
1397 * 0: prepare
1398 * 1: read or write (depending on direction) with fixed
1399 * buffer (idal allocated once when buffer is allocated)
1400 * 2: nop
1401 * ccw[3..5] (Channel program for direct write of packets)
1402 * 3: prepare
1403 * 4: write (idal allocated on every write).
1404 * 5: nop
1405 * ccw[6..7] (Channel program for initial channel setup):
1406 * 6: set extended mode
1407 * 7: nop
1408 *
1409 * ch->ccw[0..5] are initialized in ch_action_start because
1410 * the channel's direction is yet unknown here.
1411 *
1412 * ccws used for xid2 negotiations
1413 * ch-ccw[8-14] need to be used for the XID exchange either
1414 * X side XID2 Processing
1415 * 8: write control
1416 * 9: write th
1417 * 10: write XID
1418 * 11: read th from secondary
1419 * 12: read XID from secondary
1420 * 13: read 4 byte ID
1421 * 14: nop
1422 * Y side XID Processing
1423 * 8: sense
1424 * 9: read th
1425 * 10: read XID
1426 * 11: write th
1427 * 12: write XID
1428 * 13: write 4 byte ID
1429 * 14: nop
1430 *
1431 * ccws used for double noop due to VM timing issues
1432 * which result in unrecoverable Busy on channel
1433 * 15: nop
1434 * 16: nop
1435 */
1436 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1437 ch->ccw[6].flags = CCW_FLAG_SLI;
1438
1439 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1440 ch->ccw[7].flags = CCW_FLAG_SLI;
1441
1442 if (IS_MPC(priv)) {
1443 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1444 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1445 ch->ccw[15].count = TH_HEADER_LENGTH;
1446 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1447
1448 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1449 ch->ccw[16].flags = CCW_FLAG_SLI;
1450
1451 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1452 ctc_ch_event_names, CTC_MPC_NR_STATES,
1453 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1454 mpc_ch_fsm_len, GFP_KERNEL);
1455 } else {
1456 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1457 ctc_ch_event_names, CTC_NR_STATES,
1458 CTC_NR_EVENTS, ch_fsm,
1459 ch_fsm_len, GFP_KERNEL);
1460 }
1461 if (ch->fsm == NULL)
1462 goto free_return;
1463
1464 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1465
1466 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1467 if (ch->irb == NULL)
1468 goto nomem_return;
1469
1470 while (*c && ctcm_less_than((*c)->id, ch->id))
1471 c = &(*c)->next;
1472
1473 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1474 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1475 "%s (%s) already in list, using old entry",
1476 __func__, (*c)->id);
1477
1478 goto free_return;
1479 }
1480
1481 spin_lock_init(&ch->collect_lock);
1482
1483 fsm_settimer(ch->fsm, &ch->timer);
1484 skb_queue_head_init(&ch->io_queue);
1485 skb_queue_head_init(&ch->collect_queue);
1486
1487 if (IS_MPC(priv)) {
1488 fsm_settimer(ch->fsm, &ch->sweep_timer);
1489 skb_queue_head_init(&ch->sweep_queue);
1490 }
1491 ch->next = *c;
1492 *c = ch;
1493 return 0;
1494
1495 nomem_return:
1496 rc = -ENOMEM;
1497
1498 free_return: /* note that all channel pointers are 0 or valid */
1499 kfree(ch->ccw);
1500 kfree(ch->discontact_th);
1501 kfree_fsm(ch->fsm);
1502 kfree(ch->irb);
1503 kfree(ch);
1504 return rc;
1505 }
1506
1507 /*
1508 * Return type of a detected device.
1509 */
1510 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1511 {
1512 enum ctcm_channel_types type;
1513 type = (enum ctcm_channel_types)id->driver_info;
1514
1515 if (type == ctcm_channel_type_ficon)
1516 type = ctcm_channel_type_escon;
1517
1518 return type;
1519 }
1520
1521 /**
1522 *
1523 * Setup an interface.
1524 *
1525 * cgdev Device to be setup.
1526 *
1527 * returns 0 on success, !0 on failure.
1528 */
1529 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1530 {
1531 char read_id[CTCM_ID_SIZE];
1532 char write_id[CTCM_ID_SIZE];
1533 int direction;
1534 enum ctcm_channel_types type;
1535 struct ctcm_priv *priv;
1536 struct net_device *dev;
1537 struct ccw_device *cdev0;
1538 struct ccw_device *cdev1;
1539 struct channel *readc;
1540 struct channel *writec;
1541 int ret;
1542 int result;
1543
1544 priv = dev_get_drvdata(&cgdev->dev);
1545 if (!priv) {
1546 result = -ENODEV;
1547 goto out_err_result;
1548 }
1549
1550 cdev0 = cgdev->cdev[0];
1551 cdev1 = cgdev->cdev[1];
1552
1553 type = get_channel_type(&cdev0->id);
1554
1555 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1556 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1557
1558 ret = add_channel(cdev0, type, priv);
1559 if (ret) {
1560 result = ret;
1561 goto out_err_result;
1562 }
1563 ret = add_channel(cdev1, type, priv);
1564 if (ret) {
1565 result = ret;
1566 goto out_remove_channel1;
1567 }
1568
1569 ret = ccw_device_set_online(cdev0);
1570 if (ret != 0) {
1571 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1572 "%s(%s) set_online rc=%d",
1573 CTCM_FUNTAIL, read_id, ret);
1574 result = -EIO;
1575 goto out_remove_channel2;
1576 }
1577
1578 ret = ccw_device_set_online(cdev1);
1579 if (ret != 0) {
1580 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1581 "%s(%s) set_online rc=%d",
1582 CTCM_FUNTAIL, write_id, ret);
1583
1584 result = -EIO;
1585 goto out_ccw1;
1586 }
1587
1588 dev = ctcm_init_netdevice(priv);
1589 if (dev == NULL) {
1590 result = -ENODEV;
1591 goto out_ccw2;
1592 }
1593
1594 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1595 priv->channel[direction] =
1596 channel_get(type, direction == CTCM_READ ?
1597 read_id : write_id, direction);
1598 if (priv->channel[direction] == NULL) {
1599 if (direction == CTCM_WRITE)
1600 channel_free(priv->channel[CTCM_READ]);
1601 goto out_dev;
1602 }
1603 priv->channel[direction]->netdev = dev;
1604 priv->channel[direction]->protocol = priv->protocol;
1605 priv->channel[direction]->max_bufsize = priv->buffer_size;
1606 }
1607 /* sysfs magic */
1608 SET_NETDEV_DEV(dev, &cgdev->dev);
1609
1610 if (register_netdev(dev)) {
1611 result = -ENODEV;
1612 goto out_dev;
1613 }
1614
1615 if (ctcm_add_attributes(&cgdev->dev)) {
1616 result = -ENODEV;
1617 goto out_unregister;
1618 }
1619
1620 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1621
1622 dev_info(&dev->dev,
1623 "setup OK : r/w = %s/%s, protocol : %d\n",
1624 priv->channel[CTCM_READ]->id,
1625 priv->channel[CTCM_WRITE]->id, priv->protocol);
1626
1627 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1628 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1629 priv->channel[CTCM_READ]->id,
1630 priv->channel[CTCM_WRITE]->id, priv->protocol);
1631
1632 return 0;
1633 out_unregister:
1634 unregister_netdev(dev);
1635 out_dev:
1636 ctcm_free_netdevice(dev);
1637 out_ccw2:
1638 ccw_device_set_offline(cgdev->cdev[1]);
1639 out_ccw1:
1640 ccw_device_set_offline(cgdev->cdev[0]);
1641 out_remove_channel2:
1642 readc = channel_get(type, read_id, CTCM_READ);
1643 channel_remove(readc);
1644 out_remove_channel1:
1645 writec = channel_get(type, write_id, CTCM_WRITE);
1646 channel_remove(writec);
1647 out_err_result:
1648 return result;
1649 }
1650
1651 /**
1652 * Shutdown an interface.
1653 *
1654 * cgdev Device to be shut down.
1655 *
1656 * returns 0 on success, !0 on failure.
1657 */
1658 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1659 {
1660 struct ctcm_priv *priv;
1661 struct net_device *dev;
1662
1663 priv = dev_get_drvdata(&cgdev->dev);
1664 if (!priv)
1665 return -ENODEV;
1666
1667 if (priv->channel[CTCM_READ]) {
1668 dev = priv->channel[CTCM_READ]->netdev;
1669 CTCM_DBF_DEV(SETUP, dev, "");
1670 /* Close the device */
1671 ctcm_close(dev);
1672 dev->flags &= ~IFF_RUNNING;
1673 ctcm_remove_attributes(&cgdev->dev);
1674 channel_free(priv->channel[CTCM_READ]);
1675 } else
1676 dev = NULL;
1677
1678 if (priv->channel[CTCM_WRITE])
1679 channel_free(priv->channel[CTCM_WRITE]);
1680
1681 if (dev) {
1682 unregister_netdev(dev);
1683 ctcm_free_netdevice(dev);
1684 }
1685
1686 if (priv->fsm)
1687 kfree_fsm(priv->fsm);
1688
1689 ccw_device_set_offline(cgdev->cdev[1]);
1690 ccw_device_set_offline(cgdev->cdev[0]);
1691
1692 if (priv->channel[CTCM_READ])
1693 channel_remove(priv->channel[CTCM_READ]);
1694 if (priv->channel[CTCM_WRITE])
1695 channel_remove(priv->channel[CTCM_WRITE]);
1696 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1697
1698 return 0;
1699
1700 }
1701
1702
1703 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1704 {
1705 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1706
1707 BUG_ON(priv == NULL);
1708
1709 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1710 "removing device %p, proto : %d",
1711 cgdev, priv->protocol);
1712
1713 if (cgdev->state == CCWGROUP_ONLINE)
1714 ctcm_shutdown_device(cgdev);
1715 ctcm_remove_files(&cgdev->dev);
1716 dev_set_drvdata(&cgdev->dev, NULL);
1717 kfree(priv);
1718 put_device(&cgdev->dev);
1719 }
1720
1721 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1722 {
1723 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1724
1725 if (gdev->state == CCWGROUP_OFFLINE)
1726 return 0;
1727 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1728 ctcm_close(priv->channel[CTCM_READ]->netdev);
1729 if (!wait_event_timeout(priv->fsm->wait_q,
1730 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1731 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1732 return -EBUSY;
1733 }
1734 ccw_device_set_offline(gdev->cdev[1]);
1735 ccw_device_set_offline(gdev->cdev[0]);
1736 return 0;
1737 }
1738
1739 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1740 {
1741 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1742 int rc;
1743
1744 if (gdev->state == CCWGROUP_OFFLINE)
1745 return 0;
1746 rc = ccw_device_set_online(gdev->cdev[1]);
1747 if (rc)
1748 goto err_out;
1749 rc = ccw_device_set_online(gdev->cdev[0]);
1750 if (rc)
1751 goto err_out;
1752 ctcm_open(priv->channel[CTCM_READ]->netdev);
1753 err_out:
1754 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1755 return rc;
1756 }
1757
1758 static struct ccw_device_id ctcm_ids[] = {
1759 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1760 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1761 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1762 {},
1763 };
1764 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1765
1766 static struct ccw_driver ctcm_ccw_driver = {
1767 .owner = THIS_MODULE,
1768 .name = "ctcm",
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 .owner = THIS_MODULE,
1776 .name = CTC_DRIVER_NAME,
1777 .max_slaves = 2,
1778 .driver_id = 0xC3E3C3D4, /* CTCM */
1779 .probe = ctcm_probe_device,
1780 .remove = ctcm_remove_device,
1781 .set_online = ctcm_new_device,
1782 .set_offline = ctcm_shutdown_device,
1783 .freeze = ctcm_pm_suspend,
1784 .thaw = ctcm_pm_resume,
1785 .restore = ctcm_pm_resume,
1786 };
1787
1788 static ssize_t
1789 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1790 size_t count)
1791 {
1792 int err;
1793
1794 err = ccwgroup_create_from_string(ctcm_root_dev,
1795 ctcm_group_driver.driver_id,
1796 &ctcm_ccw_driver, 2, buf);
1797 return err ? err : count;
1798 }
1799
1800 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1801
1802 static struct attribute *ctcm_group_attrs[] = {
1803 &driver_attr_group.attr,
1804 NULL,
1805 };
1806
1807 static struct attribute_group ctcm_group_attr_group = {
1808 .attrs = ctcm_group_attrs,
1809 };
1810
1811 static const struct attribute_group *ctcm_group_attr_groups[] = {
1812 &ctcm_group_attr_group,
1813 NULL,
1814 };
1815
1816 /*
1817 * Module related routines
1818 */
1819
1820 /*
1821 * Prepare to be unloaded. Free IRQ's and release all resources.
1822 * This is called just before this module is unloaded. It is
1823 * not called, if the usage count is !0, so we don't need to check
1824 * for that.
1825 */
1826 static void __exit ctcm_exit(void)
1827 {
1828 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1829 ccwgroup_driver_unregister(&ctcm_group_driver);
1830 ccw_driver_unregister(&ctcm_ccw_driver);
1831 root_device_unregister(ctcm_root_dev);
1832 ctcm_unregister_dbf_views();
1833 pr_info("CTCM driver unloaded\n");
1834 }
1835
1836 /*
1837 * Print Banner.
1838 */
1839 static void print_banner(void)
1840 {
1841 pr_info("CTCM driver initialized\n");
1842 }
1843
1844 /**
1845 * Initialize module.
1846 * This is called just after the module is loaded.
1847 *
1848 * returns 0 on success, !0 on error.
1849 */
1850 static int __init ctcm_init(void)
1851 {
1852 int ret;
1853
1854 channels = NULL;
1855
1856 ret = ctcm_register_dbf_views();
1857 if (ret)
1858 goto out_err;
1859 ctcm_root_dev = root_device_register("ctcm");
1860 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1861 if (ret)
1862 goto register_err;
1863 ret = ccw_driver_register(&ctcm_ccw_driver);
1864 if (ret)
1865 goto ccw_err;
1866 ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1867 ret = ccwgroup_driver_register(&ctcm_group_driver);
1868 if (ret)
1869 goto ccwgroup_err;
1870 print_banner();
1871 return 0;
1872
1873 ccwgroup_err:
1874 ccw_driver_unregister(&ctcm_ccw_driver);
1875 ccw_err:
1876 root_device_unregister(ctcm_root_dev);
1877 register_err:
1878 ctcm_unregister_dbf_views();
1879 out_err:
1880 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1881 __func__, ret);
1882 return ret;
1883 }
1884
1885 module_init(ctcm_init);
1886 module_exit(ctcm_exit);
1887
1888 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1889 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1890 MODULE_LICENSE("GPL");
1891
The kernel tree for Tao Ma.