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Merge tag 'mmc-v4.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc
[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / net / ctcm_main.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright IBM Corp. 2001, 2009
4 * Author(s):
5 * Original CTC driver(s):
6 * Fritz Elfert (felfert@millenux.com)
7 * Dieter Wellerdiek (wel@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Denis Joseph Barrow (barrow_dj@yahoo.com)
10 * Jochen Roehrig (roehrig@de.ibm.com)
11 * Cornelia Huck <cornelia.huck@de.ibm.com>
12 * MPC additions:
13 * Belinda Thompson (belindat@us.ibm.com)
14 * Andy Richter (richtera@us.ibm.com)
15 * Revived by:
16 * Peter Tiedemann (ptiedem@de.ibm.com)
17 */
18
19 #undef DEBUG
20 #undef DEBUGDATA
21 #undef DEBUGCCW
22
23 #define KMSG_COMPONENT "ctcm"
24 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
25
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/kernel.h>
29 #include <linux/slab.h>
30 #include <linux/errno.h>
31 #include <linux/types.h>
32 #include <linux/interrupt.h>
33 #include <linux/timer.h>
34 #include <linux/bitops.h>
35
36 #include <linux/signal.h>
37 #include <linux/string.h>
38
39 #include <linux/ip.h>
40 #include <linux/if_arp.h>
41 #include <linux/tcp.h>
42 #include <linux/skbuff.h>
43 #include <linux/ctype.h>
44 #include <net/dst.h>
45
46 #include <linux/io.h>
47 #include <asm/ccwdev.h>
48 #include <asm/ccwgroup.h>
49 #include <linux/uaccess.h>
50
51 #include <asm/idals.h>
52
53 #include "ctcm_fsms.h"
54 #include "ctcm_main.h"
55
56 /* Some common global variables */
57
58 /**
59 * The root device for ctcm group devices
60 */
61 static struct device *ctcm_root_dev;
62
63 /*
64 * Linked list of all detected channels.
65 */
66 struct channel *channels;
67
68 /**
69 * Unpack a just received skb and hand it over to
70 * upper layers.
71 *
72 * ch The channel where this skb has been received.
73 * pskb The received skb.
74 */
75 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
76 {
77 struct net_device *dev = ch->netdev;
78 struct ctcm_priv *priv = dev->ml_priv;
79 __u16 len = *((__u16 *) pskb->data);
80
81 skb_put(pskb, 2 + LL_HEADER_LENGTH);
82 skb_pull(pskb, 2);
83 pskb->dev = dev;
84 pskb->ip_summed = CHECKSUM_UNNECESSARY;
85 while (len > 0) {
86 struct sk_buff *skb;
87 int skblen;
88 struct ll_header *header = (struct ll_header *)pskb->data;
89
90 skb_pull(pskb, LL_HEADER_LENGTH);
91 if ((ch->protocol == CTCM_PROTO_S390) &&
92 (header->type != ETH_P_IP)) {
93 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
94 ch->logflags |= LOG_FLAG_ILLEGALPKT;
95 /*
96 * Check packet type only if we stick strictly
97 * to S/390's protocol of OS390. This only
98 * supports IP. Otherwise allow any packet
99 * type.
100 */
101 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
102 "%s(%s): Illegal packet type 0x%04x"
103 " - dropping",
104 CTCM_FUNTAIL, dev->name, header->type);
105 }
106 priv->stats.rx_dropped++;
107 priv->stats.rx_frame_errors++;
108 return;
109 }
110 pskb->protocol = cpu_to_be16(header->type);
111 if ((header->length <= LL_HEADER_LENGTH) ||
112 (len <= LL_HEADER_LENGTH)) {
113 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
114 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
115 "%s(%s): Illegal packet size %d(%d,%d)"
116 "- dropping",
117 CTCM_FUNTAIL, dev->name,
118 header->length, dev->mtu, len);
119 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
120 }
121
122 priv->stats.rx_dropped++;
123 priv->stats.rx_length_errors++;
124 return;
125 }
126 header->length -= LL_HEADER_LENGTH;
127 len -= LL_HEADER_LENGTH;
128 if ((header->length > skb_tailroom(pskb)) ||
129 (header->length > len)) {
130 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
131 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
132 "%s(%s): Packet size %d (overrun)"
133 " - dropping", CTCM_FUNTAIL,
134 dev->name, header->length);
135 ch->logflags |= LOG_FLAG_OVERRUN;
136 }
137
138 priv->stats.rx_dropped++;
139 priv->stats.rx_length_errors++;
140 return;
141 }
142 skb_put(pskb, header->length);
143 skb_reset_mac_header(pskb);
144 len -= header->length;
145 skb = dev_alloc_skb(pskb->len);
146 if (!skb) {
147 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
148 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
149 "%s(%s): MEMORY allocation error",
150 CTCM_FUNTAIL, dev->name);
151 ch->logflags |= LOG_FLAG_NOMEM;
152 }
153 priv->stats.rx_dropped++;
154 return;
155 }
156 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
157 pskb->len);
158 skb_reset_mac_header(skb);
159 skb->dev = pskb->dev;
160 skb->protocol = pskb->protocol;
161 pskb->ip_summed = CHECKSUM_UNNECESSARY;
162 skblen = skb->len;
163 /*
164 * reset logflags
165 */
166 ch->logflags = 0;
167 priv->stats.rx_packets++;
168 priv->stats.rx_bytes += skblen;
169 netif_rx_ni(skb);
170 if (len > 0) {
171 skb_pull(pskb, header->length);
172 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
173 CTCM_DBF_DEV_NAME(TRACE, dev,
174 "Overrun in ctcm_unpack_skb");
175 ch->logflags |= LOG_FLAG_OVERRUN;
176 return;
177 }
178 skb_put(pskb, LL_HEADER_LENGTH);
179 }
180 }
181 }
182
183 /**
184 * Release a specific channel in the channel list.
185 *
186 * ch Pointer to channel struct to be released.
187 */
188 static void channel_free(struct channel *ch)
189 {
190 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
191 ch->flags &= ~CHANNEL_FLAGS_INUSE;
192 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
193 }
194
195 /**
196 * Remove a specific channel in the channel list.
197 *
198 * ch Pointer to channel struct to be released.
199 */
200 static void channel_remove(struct channel *ch)
201 {
202 struct channel **c = &channels;
203 char chid[CTCM_ID_SIZE+1];
204 int ok = 0;
205
206 if (ch == NULL)
207 return;
208 else
209 strncpy(chid, ch->id, CTCM_ID_SIZE);
210
211 channel_free(ch);
212 while (*c) {
213 if (*c == ch) {
214 *c = ch->next;
215 fsm_deltimer(&ch->timer);
216 if (IS_MPC(ch))
217 fsm_deltimer(&ch->sweep_timer);
218
219 kfree_fsm(ch->fsm);
220 clear_normalized_cda(&ch->ccw[4]);
221 if (ch->trans_skb != NULL) {
222 clear_normalized_cda(&ch->ccw[1]);
223 dev_kfree_skb_any(ch->trans_skb);
224 }
225 if (IS_MPC(ch)) {
226 tasklet_kill(&ch->ch_tasklet);
227 tasklet_kill(&ch->ch_disc_tasklet);
228 kfree(ch->discontact_th);
229 }
230 kfree(ch->ccw);
231 kfree(ch->irb);
232 kfree(ch);
233 ok = 1;
234 break;
235 }
236 c = &((*c)->next);
237 }
238
239 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
240 chid, ok ? "OK" : "failed");
241 }
242
243 /**
244 * Get a specific channel from the channel list.
245 *
246 * type Type of channel we are interested in.
247 * id Id of channel we are interested in.
248 * direction Direction we want to use this channel for.
249 *
250 * returns Pointer to a channel or NULL if no matching channel available.
251 */
252 static struct channel *channel_get(enum ctcm_channel_types type,
253 char *id, int direction)
254 {
255 struct channel *ch = channels;
256
257 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
258 ch = ch->next;
259 if (!ch) {
260 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
261 "%s(%d, %s, %d) not found in channel list\n",
262 CTCM_FUNTAIL, type, id, direction);
263 } else {
264 if (ch->flags & CHANNEL_FLAGS_INUSE)
265 ch = NULL;
266 else {
267 ch->flags |= CHANNEL_FLAGS_INUSE;
268 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
269 ch->flags |= (direction == CTCM_WRITE)
270 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
271 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
272 }
273 }
274 return ch;
275 }
276
277 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
278 {
279 if (!IS_ERR(irb))
280 return 0;
281
282 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
283 "irb error %ld on device %s\n",
284 PTR_ERR(irb), dev_name(&cdev->dev));
285
286 switch (PTR_ERR(irb)) {
287 case -EIO:
288 dev_err(&cdev->dev,
289 "An I/O-error occurred on the CTCM device\n");
290 break;
291 case -ETIMEDOUT:
292 dev_err(&cdev->dev,
293 "An adapter hardware operation timed out\n");
294 break;
295 default:
296 dev_err(&cdev->dev,
297 "An error occurred on the adapter hardware\n");
298 }
299 return PTR_ERR(irb);
300 }
301
302
303 /**
304 * Check sense of a unit check.
305 *
306 * ch The channel, the sense code belongs to.
307 * sense The sense code to inspect.
308 */
309 static void ccw_unit_check(struct channel *ch, __u8 sense)
310 {
311 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
312 "%s(%s): %02x",
313 CTCM_FUNTAIL, ch->id, sense);
314
315 if (sense & SNS0_INTERVENTION_REQ) {
316 if (sense & 0x01) {
317 if (ch->sense_rc != 0x01) {
318 pr_notice(
319 "%s: The communication peer has "
320 "disconnected\n", ch->id);
321 ch->sense_rc = 0x01;
322 }
323 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
324 } else {
325 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
326 pr_notice(
327 "%s: The remote operating system is "
328 "not available\n", ch->id);
329 ch->sense_rc = SNS0_INTERVENTION_REQ;
330 }
331 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
332 }
333 } else if (sense & SNS0_EQUIPMENT_CHECK) {
334 if (sense & SNS0_BUS_OUT_CHECK) {
335 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
336 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
337 "%s(%s): remote HW error %02x",
338 CTCM_FUNTAIL, ch->id, sense);
339 ch->sense_rc = SNS0_BUS_OUT_CHECK;
340 }
341 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
342 } else {
343 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
344 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
345 "%s(%s): remote read parity error %02x",
346 CTCM_FUNTAIL, ch->id, sense);
347 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
348 }
349 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
350 }
351 } else if (sense & SNS0_BUS_OUT_CHECK) {
352 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
353 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
354 "%s(%s): BUS OUT error %02x",
355 CTCM_FUNTAIL, ch->id, sense);
356 ch->sense_rc = SNS0_BUS_OUT_CHECK;
357 }
358 if (sense & 0x04) /* data-streaming timeout */
359 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
360 else /* Data-transfer parity error */
361 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
362 } else if (sense & SNS0_CMD_REJECT) {
363 if (ch->sense_rc != SNS0_CMD_REJECT) {
364 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
365 "%s(%s): Command rejected",
366 CTCM_FUNTAIL, ch->id);
367 ch->sense_rc = SNS0_CMD_REJECT;
368 }
369 } else if (sense == 0) {
370 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
371 "%s(%s): Unit check ZERO",
372 CTCM_FUNTAIL, ch->id);
373 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
374 } else {
375 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
376 "%s(%s): Unit check code %02x unknown",
377 CTCM_FUNTAIL, ch->id, sense);
378 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
379 }
380 }
381
382 int ctcm_ch_alloc_buffer(struct channel *ch)
383 {
384 clear_normalized_cda(&ch->ccw[1]);
385 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
386 if (ch->trans_skb == NULL) {
387 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
388 "%s(%s): %s trans_skb allocation error",
389 CTCM_FUNTAIL, ch->id,
390 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
391 "RX" : "TX");
392 return -ENOMEM;
393 }
394
395 ch->ccw[1].count = ch->max_bufsize;
396 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
397 dev_kfree_skb(ch->trans_skb);
398 ch->trans_skb = NULL;
399 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
400 "%s(%s): %s set norm_cda failed",
401 CTCM_FUNTAIL, ch->id,
402 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
403 "RX" : "TX");
404 return -ENOMEM;
405 }
406
407 ch->ccw[1].count = 0;
408 ch->trans_skb_data = ch->trans_skb->data;
409 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
410 return 0;
411 }
412
413 /*
414 * Interface API for upper network layers
415 */
416
417 /**
418 * Open an interface.
419 * Called from generic network layer when ifconfig up is run.
420 *
421 * dev Pointer to interface struct.
422 *
423 * returns 0 on success, -ERRNO on failure. (Never fails.)
424 */
425 int ctcm_open(struct net_device *dev)
426 {
427 struct ctcm_priv *priv = dev->ml_priv;
428
429 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
430 if (!IS_MPC(priv))
431 fsm_event(priv->fsm, DEV_EVENT_START, dev);
432 return 0;
433 }
434
435 /**
436 * Close an interface.
437 * Called from generic network layer when ifconfig down is run.
438 *
439 * dev Pointer to interface struct.
440 *
441 * returns 0 on success, -ERRNO on failure. (Never fails.)
442 */
443 int ctcm_close(struct net_device *dev)
444 {
445 struct ctcm_priv *priv = dev->ml_priv;
446
447 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
448 if (!IS_MPC(priv))
449 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
450 return 0;
451 }
452
453
454 /**
455 * Transmit a packet.
456 * This is a helper function for ctcm_tx().
457 *
458 * ch Channel to be used for sending.
459 * skb Pointer to struct sk_buff of packet to send.
460 * The linklevel header has already been set up
461 * by ctcm_tx().
462 *
463 * returns 0 on success, -ERRNO on failure. (Never fails.)
464 */
465 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
466 {
467 unsigned long saveflags;
468 struct ll_header header;
469 int rc = 0;
470 __u16 block_len;
471 int ccw_idx;
472 struct sk_buff *nskb;
473 unsigned long hi;
474
475 /* we need to acquire the lock for testing the state
476 * otherwise we can have an IRQ changing the state to
477 * TXIDLE after the test but before acquiring the lock.
478 */
479 spin_lock_irqsave(&ch->collect_lock, saveflags);
480 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
481 int l = skb->len + LL_HEADER_LENGTH;
482
483 if (ch->collect_len + l > ch->max_bufsize - 2) {
484 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
485 return -EBUSY;
486 } else {
487 refcount_inc(&skb->users);
488 header.length = l;
489 header.type = be16_to_cpu(skb->protocol);
490 header.unused = 0;
491 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
492 LL_HEADER_LENGTH);
493 skb_queue_tail(&ch->collect_queue, skb);
494 ch->collect_len += l;
495 }
496 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
497 goto done;
498 }
499 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
500 /*
501 * Protect skb against beeing free'd by upper
502 * layers.
503 */
504 refcount_inc(&skb->users);
505 ch->prof.txlen += skb->len;
506 header.length = skb->len + LL_HEADER_LENGTH;
507 header.type = be16_to_cpu(skb->protocol);
508 header.unused = 0;
509 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
510 block_len = skb->len + 2;
511 *((__u16 *)skb_push(skb, 2)) = block_len;
512
513 /*
514 * IDAL support in CTCM is broken, so we have to
515 * care about skb's above 2G ourselves.
516 */
517 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
518 if (hi) {
519 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
520 if (!nskb) {
521 refcount_dec(&skb->users);
522 skb_pull(skb, LL_HEADER_LENGTH + 2);
523 ctcm_clear_busy(ch->netdev);
524 return -ENOMEM;
525 } else {
526 skb_put_data(nskb, skb->data, skb->len);
527 refcount_inc(&nskb->users);
528 refcount_dec(&skb->users);
529 dev_kfree_skb_irq(skb);
530 skb = nskb;
531 }
532 }
533
534 ch->ccw[4].count = block_len;
535 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
536 /*
537 * idal allocation failed, try via copying to
538 * trans_skb. trans_skb usually has a pre-allocated
539 * idal.
540 */
541 if (ctcm_checkalloc_buffer(ch)) {
542 /*
543 * Remove our header. It gets added
544 * again on retransmit.
545 */
546 refcount_dec(&skb->users);
547 skb_pull(skb, LL_HEADER_LENGTH + 2);
548 ctcm_clear_busy(ch->netdev);
549 return -ENOMEM;
550 }
551
552 skb_reset_tail_pointer(ch->trans_skb);
553 ch->trans_skb->len = 0;
554 ch->ccw[1].count = skb->len;
555 skb_copy_from_linear_data(skb,
556 skb_put(ch->trans_skb, skb->len), skb->len);
557 refcount_dec(&skb->users);
558 dev_kfree_skb_irq(skb);
559 ccw_idx = 0;
560 } else {
561 skb_queue_tail(&ch->io_queue, skb);
562 ccw_idx = 3;
563 }
564 if (do_debug_ccw)
565 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
566 sizeof(struct ccw1) * 3);
567 ch->retry = 0;
568 fsm_newstate(ch->fsm, CTC_STATE_TX);
569 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
571 ch->prof.send_stamp = jiffies;
572 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
573 (unsigned long)ch, 0xff, 0);
574 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
575 if (ccw_idx == 3)
576 ch->prof.doios_single++;
577 if (rc != 0) {
578 fsm_deltimer(&ch->timer);
579 ctcm_ccw_check_rc(ch, rc, "single skb TX");
580 if (ccw_idx == 3)
581 skb_dequeue_tail(&ch->io_queue);
582 /*
583 * Remove our header. It gets added
584 * again on retransmit.
585 */
586 skb_pull(skb, LL_HEADER_LENGTH + 2);
587 } else if (ccw_idx == 0) {
588 struct net_device *dev = ch->netdev;
589 struct ctcm_priv *priv = dev->ml_priv;
590 priv->stats.tx_packets++;
591 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
592 }
593 done:
594 ctcm_clear_busy(ch->netdev);
595 return rc;
596 }
597
598 static void ctcmpc_send_sweep_req(struct channel *rch)
599 {
600 struct net_device *dev = rch->netdev;
601 struct ctcm_priv *priv;
602 struct mpc_group *grp;
603 struct th_sweep *header;
604 struct sk_buff *sweep_skb;
605 struct channel *ch;
606 /* int rc = 0; */
607
608 priv = dev->ml_priv;
609 grp = priv->mpcg;
610 ch = priv->channel[CTCM_WRITE];
611
612 /* sweep processing is not complete until response and request */
613 /* has completed for all read channels in group */
614 if (grp->in_sweep == 0) {
615 grp->in_sweep = 1;
616 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
617 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
618 }
619
620 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
621
622 if (sweep_skb == NULL) {
623 /* rc = -ENOMEM; */
624 goto nomem;
625 }
626
627 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
628
629 if (!header) {
630 dev_kfree_skb_any(sweep_skb);
631 /* rc = -ENOMEM; */
632 goto nomem;
633 }
634
635 header->th.th_seg = 0x00 ;
636 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
637 header->th.th_blk_flag = 0x00;
638 header->th.th_is_xid = 0x00;
639 header->th.th_seq_num = 0x00;
640 header->sw.th_last_seq = ch->th_seq_num;
641
642 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
643
644 kfree(header);
645
646 netif_trans_update(dev);
647 skb_queue_tail(&ch->sweep_queue, sweep_skb);
648
649 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
650
651 return;
652
653 nomem:
654 grp->in_sweep = 0;
655 ctcm_clear_busy(dev);
656 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
657
658 return;
659 }
660
661 /*
662 * MPC mode version of transmit_skb
663 */
664 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
665 {
666 struct pdu *p_header;
667 struct net_device *dev = ch->netdev;
668 struct ctcm_priv *priv = dev->ml_priv;
669 struct mpc_group *grp = priv->mpcg;
670 struct th_header *header;
671 struct sk_buff *nskb;
672 int rc = 0;
673 int ccw_idx;
674 unsigned long hi;
675 unsigned long saveflags = 0; /* avoids compiler warning */
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 refcount_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 (be16_to_cpu(skb->protocol) == 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 refcount_inc(&skb->users);
721
722 /*
723 * IDAL support in CTCM is broken, so we have to
724 * care about skb's above 2G ourselves.
725 */
726 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
727 if (hi) {
728 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
729 if (!nskb) {
730 goto nomem_exit;
731 } else {
732 skb_put_data(nskb, skb->data, skb->len);
733 refcount_inc(&nskb->users);
734 refcount_dec(&skb->users);
735 dev_kfree_skb_irq(skb);
736 skb = nskb;
737 }
738 }
739
740 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
741
742 if (!p_header)
743 goto nomem_exit;
744
745 p_header->pdu_offset = skb->len;
746 p_header->pdu_proto = 0x01;
747 p_header->pdu_flag = 0x00;
748 p_header->pdu_seq = 0;
749 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
750 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
751 } else {
752 p_header->pdu_flag |= PDU_FIRST;
753 }
754 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
755
756 kfree(p_header);
757
758 if (ch->collect_len > 0) {
759 spin_lock_irqsave(&ch->collect_lock, saveflags);
760 skb_queue_tail(&ch->collect_queue, skb);
761 ch->collect_len += skb->len;
762 skb = skb_dequeue(&ch->collect_queue);
763 ch->collect_len -= skb->len;
764 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
765 }
766
767 p_header = (struct pdu *)skb->data;
768 p_header->pdu_flag |= PDU_LAST;
769
770 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
771
772 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
773 if (!header)
774 goto nomem_exit;
775
776 header->th_seg = 0x00;
777 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
778 header->th_blk_flag = 0x00;
779 header->th_is_xid = 0x00; /* Just data here */
780 ch->th_seq_num++;
781 header->th_seq_num = ch->th_seq_num;
782
783 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
784 __func__, dev->name, ch->th_seq_num);
785
786 /* put the TH on the packet */
787 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
788
789 kfree(header);
790
791 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
792 "up to 32 bytes sent to vtam:\n",
793 __func__, dev->name, skb->len);
794 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
795
796 ch->ccw[4].count = skb->len;
797 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
798 /*
799 * idal allocation failed, try via copying to trans_skb.
800 * trans_skb usually has a pre-allocated idal.
801 */
802 if (ctcm_checkalloc_buffer(ch)) {
803 /*
804 * Remove our header.
805 * It gets added again on retransmit.
806 */
807 goto nomem_exit;
808 }
809
810 skb_reset_tail_pointer(ch->trans_skb);
811 ch->trans_skb->len = 0;
812 ch->ccw[1].count = skb->len;
813 skb_put_data(ch->trans_skb, skb->data, skb->len);
814 refcount_dec(&skb->users);
815 dev_kfree_skb_irq(skb);
816 ccw_idx = 0;
817 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
818 "up to 32 bytes sent to vtam:\n",
819 __func__, dev->name, ch->trans_skb->len);
820 CTCM_D3_DUMP((char *)ch->trans_skb->data,
821 min_t(int, 32, ch->trans_skb->len));
822 } else {
823 skb_queue_tail(&ch->io_queue, skb);
824 ccw_idx = 3;
825 }
826 ch->retry = 0;
827 fsm_newstate(ch->fsm, CTC_STATE_TX);
828 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
829
830 if (do_debug_ccw)
831 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
832 sizeof(struct ccw1) * 3);
833
834 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
835 ch->prof.send_stamp = jiffies;
836 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
837 (unsigned long)ch, 0xff, 0);
838 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
839 if (ccw_idx == 3)
840 ch->prof.doios_single++;
841 if (rc != 0) {
842 fsm_deltimer(&ch->timer);
843 ctcm_ccw_check_rc(ch, rc, "single skb TX");
844 if (ccw_idx == 3)
845 skb_dequeue_tail(&ch->io_queue);
846 } else if (ccw_idx == 0) {
847 priv->stats.tx_packets++;
848 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
849 }
850 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
851 ctcmpc_send_sweep_req(ch);
852
853 goto done;
854 nomem_exit:
855 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
856 "%s(%s): MEMORY allocation ERROR\n",
857 CTCM_FUNTAIL, ch->id);
858 rc = -ENOMEM;
859 refcount_dec(&skb->users);
860 dev_kfree_skb_any(skb);
861 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
862 done:
863 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
864 return rc;
865 }
866
867 /**
868 * Start transmission of a packet.
869 * Called from generic network device layer.
870 *
871 * skb Pointer to buffer containing the packet.
872 * dev Pointer to interface struct.
873 *
874 * returns 0 if packet consumed, !0 if packet rejected.
875 * Note: If we return !0, then the packet is free'd by
876 * the generic network layer.
877 */
878 /* first merge version - leaving both functions separated */
879 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
880 {
881 struct ctcm_priv *priv = dev->ml_priv;
882
883 if (skb == NULL) {
884 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
885 "%s(%s): NULL sk_buff passed",
886 CTCM_FUNTAIL, dev->name);
887 priv->stats.tx_dropped++;
888 return NETDEV_TX_OK;
889 }
890 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
891 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
892 "%s(%s): Got sk_buff with head room < %ld bytes",
893 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
894 dev_kfree_skb(skb);
895 priv->stats.tx_dropped++;
896 return NETDEV_TX_OK;
897 }
898
899 /*
900 * If channels are not running, try to restart them
901 * and throw away packet.
902 */
903 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
904 fsm_event(priv->fsm, DEV_EVENT_START, dev);
905 dev_kfree_skb(skb);
906 priv->stats.tx_dropped++;
907 priv->stats.tx_errors++;
908 priv->stats.tx_carrier_errors++;
909 return NETDEV_TX_OK;
910 }
911
912 if (ctcm_test_and_set_busy(dev))
913 return NETDEV_TX_BUSY;
914
915 netif_trans_update(dev);
916 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
917 return NETDEV_TX_BUSY;
918 return NETDEV_TX_OK;
919 }
920
921 /* unmerged MPC variant of ctcm_tx */
922 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
923 {
924 int len = 0;
925 struct ctcm_priv *priv = dev->ml_priv;
926 struct mpc_group *grp = priv->mpcg;
927 struct sk_buff *newskb = NULL;
928
929 /*
930 * Some sanity checks ...
931 */
932 if (skb == NULL) {
933 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
934 "%s(%s): NULL sk_buff passed",
935 CTCM_FUNTAIL, dev->name);
936 priv->stats.tx_dropped++;
937 goto done;
938 }
939 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
940 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
941 "%s(%s): Got sk_buff with head room < %ld bytes",
942 CTCM_FUNTAIL, dev->name,
943 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
944
945 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
946
947 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
948 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
949
950 if (!newskb) {
951 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
952 "%s: %s: __dev_alloc_skb failed",
953 __func__, dev->name);
954
955 dev_kfree_skb_any(skb);
956 priv->stats.tx_dropped++;
957 priv->stats.tx_errors++;
958 priv->stats.tx_carrier_errors++;
959 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
960 goto done;
961 }
962 newskb->protocol = skb->protocol;
963 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
964 skb_put_data(newskb, skb->data, skb->len);
965 dev_kfree_skb_any(skb);
966 skb = newskb;
967 }
968
969 /*
970 * If channels are not running,
971 * notify anybody about a link failure and throw
972 * away packet.
973 */
974 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
975 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
976 dev_kfree_skb_any(skb);
977 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
978 "%s(%s): inactive MPCGROUP - dropped",
979 CTCM_FUNTAIL, dev->name);
980 priv->stats.tx_dropped++;
981 priv->stats.tx_errors++;
982 priv->stats.tx_carrier_errors++;
983 goto done;
984 }
985
986 if (ctcm_test_and_set_busy(dev)) {
987 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
988 "%s(%s): device busy - dropped",
989 CTCM_FUNTAIL, dev->name);
990 dev_kfree_skb_any(skb);
991 priv->stats.tx_dropped++;
992 priv->stats.tx_errors++;
993 priv->stats.tx_carrier_errors++;
994 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
995 goto done;
996 }
997
998 netif_trans_update(dev);
999 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
1000 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1001 "%s(%s): device error - dropped",
1002 CTCM_FUNTAIL, dev->name);
1003 dev_kfree_skb_any(skb);
1004 priv->stats.tx_dropped++;
1005 priv->stats.tx_errors++;
1006 priv->stats.tx_carrier_errors++;
1007 ctcm_clear_busy(dev);
1008 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1009 goto done;
1010 }
1011 ctcm_clear_busy(dev);
1012 done:
1013 if (do_debug)
1014 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1015
1016 return NETDEV_TX_OK; /* handle freeing of skb here */
1017 }
1018
1019
1020 /**
1021 * Sets MTU of an interface.
1022 *
1023 * dev Pointer to interface struct.
1024 * new_mtu The new MTU to use for this interface.
1025 *
1026 * returns 0 on success, -EINVAL if MTU is out of valid range.
1027 * (valid range is 576 .. 65527). If VM is on the
1028 * remote side, maximum MTU is 32760, however this is
1029 * not checked here.
1030 */
1031 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1032 {
1033 struct ctcm_priv *priv;
1034 int max_bufsize;
1035
1036 priv = dev->ml_priv;
1037 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1038
1039 if (IS_MPC(priv)) {
1040 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1041 return -EINVAL;
1042 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1043 } else {
1044 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1045 return -EINVAL;
1046 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1047 }
1048 dev->mtu = new_mtu;
1049 return 0;
1050 }
1051
1052 /**
1053 * Returns interface statistics of a device.
1054 *
1055 * dev Pointer to interface struct.
1056 *
1057 * returns Pointer to stats struct of this interface.
1058 */
1059 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1060 {
1061 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1062 }
1063
1064 static void ctcm_free_netdevice(struct net_device *dev)
1065 {
1066 struct ctcm_priv *priv;
1067 struct mpc_group *grp;
1068
1069 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1070 "%s(%s)", CTCM_FUNTAIL, dev->name);
1071 priv = dev->ml_priv;
1072 if (priv) {
1073 grp = priv->mpcg;
1074 if (grp) {
1075 if (grp->fsm)
1076 kfree_fsm(grp->fsm);
1077 if (grp->xid_skb)
1078 dev_kfree_skb(grp->xid_skb);
1079 if (grp->rcvd_xid_skb)
1080 dev_kfree_skb(grp->rcvd_xid_skb);
1081 tasklet_kill(&grp->mpc_tasklet2);
1082 kfree(grp);
1083 priv->mpcg = NULL;
1084 }
1085 if (priv->fsm) {
1086 kfree_fsm(priv->fsm);
1087 priv->fsm = NULL;
1088 }
1089 kfree(priv->xid);
1090 priv->xid = NULL;
1091 /*
1092 * Note: kfree(priv); is done in "opposite" function of
1093 * allocator function probe_device which is remove_device.
1094 */
1095 }
1096 #ifdef MODULE
1097 free_netdev(dev);
1098 #endif
1099 }
1100
1101 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1102
1103 static const struct net_device_ops ctcm_netdev_ops = {
1104 .ndo_open = ctcm_open,
1105 .ndo_stop = ctcm_close,
1106 .ndo_get_stats = ctcm_stats,
1107 .ndo_change_mtu = ctcm_change_mtu,
1108 .ndo_start_xmit = ctcm_tx,
1109 };
1110
1111 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1112 .ndo_open = ctcm_open,
1113 .ndo_stop = ctcm_close,
1114 .ndo_get_stats = ctcm_stats,
1115 .ndo_change_mtu = ctcm_change_mtu,
1116 .ndo_start_xmit = ctcmpc_tx,
1117 };
1118
1119 static void ctcm_dev_setup(struct net_device *dev)
1120 {
1121 dev->type = ARPHRD_SLIP;
1122 dev->tx_queue_len = 100;
1123 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1124 dev->min_mtu = 576;
1125 dev->max_mtu = 65527;
1126 }
1127
1128 /*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133 {
1134 struct net_device *dev;
1135 struct mpc_group *grp;
1136 if (!priv)
1137 return NULL;
1138
1139 if (IS_MPC(priv))
1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1141 ctcm_dev_setup);
1142 else
1143 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1144 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 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1209 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1210
1211 if (ctcm_check_irb_error(cdev, irb))
1212 return;
1213
1214 cgdev = dev_get_drvdata(&cdev->dev);
1215
1216 cstat = irb->scsw.cmd.cstat;
1217 dstat = irb->scsw.cmd.dstat;
1218
1219 /* Check for unsolicited interrupts. */
1220 if (cgdev == NULL) {
1221 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1222 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1223 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1224 dev_warn(&cdev->dev,
1225 "The adapter received a non-specific IRQ\n");
1226 return;
1227 }
1228
1229 priv = dev_get_drvdata(&cgdev->dev);
1230
1231 /* Try to extract channel from driver data. */
1232 if (priv->channel[CTCM_READ]->cdev == cdev)
1233 ch = priv->channel[CTCM_READ];
1234 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1235 ch = priv->channel[CTCM_WRITE];
1236 else {
1237 dev_err(&cdev->dev,
1238 "%s: Internal error: Can't determine channel for "
1239 "interrupt device %s\n",
1240 __func__, dev_name(&cdev->dev));
1241 /* Explain: inconsistent internal structures */
1242 return;
1243 }
1244
1245 dev = ch->netdev;
1246 if (dev == NULL) {
1247 dev_err(&cdev->dev,
1248 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1249 __func__, ch);
1250 /* Explain: inconsistent internal structures */
1251 return;
1252 }
1253
1254 /* Copy interruption response block. */
1255 memcpy(ch->irb, irb, sizeof(struct irb));
1256
1257 /* Issue error message and return on subchannel error code */
1258 if (irb->scsw.cmd.cstat) {
1259 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1260 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1261 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1262 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1263 dev_warn(&cdev->dev,
1264 "A check occurred on the subchannel\n");
1265 return;
1266 }
1267
1268 /* Check the reason-code of a unit check */
1269 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1270 if ((irb->ecw[0] & ch->sense_rc) == 0)
1271 /* print it only once */
1272 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1273 "%s(%s): sense=%02x, ds=%02x",
1274 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1275 ccw_unit_check(ch, irb->ecw[0]);
1276 return;
1277 }
1278 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1279 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1280 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1281 else
1282 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1283 return;
1284 }
1285 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1286 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1287 return;
1288 }
1289 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1290 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1291 (irb->scsw.cmd.stctl ==
1292 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1293 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1294 else
1295 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1296
1297 }
1298
1299 static const struct device_type ctcm_devtype = {
1300 .name = "ctcm",
1301 .groups = ctcm_attr_groups,
1302 };
1303
1304 /**
1305 * Add ctcm specific attributes.
1306 * Add ctcm private data.
1307 *
1308 * cgdev pointer to ccwgroup_device just added
1309 *
1310 * returns 0 on success, !0 on failure.
1311 */
1312 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1313 {
1314 struct ctcm_priv *priv;
1315
1316 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1317 "%s %p",
1318 __func__, cgdev);
1319
1320 if (!get_device(&cgdev->dev))
1321 return -ENODEV;
1322
1323 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1324 if (!priv) {
1325 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1326 "%s: memory allocation failure",
1327 CTCM_FUNTAIL);
1328 put_device(&cgdev->dev);
1329 return -ENOMEM;
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 cgdev->dev.type = &ctcm_devtype;
1336
1337 return 0;
1338 }
1339
1340 /**
1341 * Add a new channel to the list of channels.
1342 * Keeps the channel list sorted.
1343 *
1344 * cdev The ccw_device to be added.
1345 * type The type class of the new channel.
1346 * priv Points to the private data of the ccwgroup_device.
1347 *
1348 * returns 0 on success, !0 on error.
1349 */
1350 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1351 struct ctcm_priv *priv)
1352 {
1353 struct channel **c = &channels;
1354 struct channel *ch;
1355 int ccw_num;
1356 int rc = 0;
1357
1358 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1359 "%s(%s), type %d, proto %d",
1360 __func__, dev_name(&cdev->dev), type, priv->protocol);
1361
1362 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1363 if (ch == NULL)
1364 return -ENOMEM;
1365
1366 ch->protocol = priv->protocol;
1367 if (IS_MPC(priv)) {
1368 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1369 if (ch->discontact_th == NULL)
1370 goto nomem_return;
1371
1372 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1373 tasklet_init(&ch->ch_disc_tasklet,
1374 mpc_action_send_discontact, (unsigned long)ch);
1375
1376 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1377 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1378 ccw_num = 17;
1379 } else
1380 ccw_num = 8;
1381
1382 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1383 if (ch->ccw == NULL)
1384 goto nomem_return;
1385
1386 ch->cdev = cdev;
1387 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1388 ch->type = type;
1389
1390 /**
1391 * "static" ccws are used in the following way:
1392 *
1393 * ccw[0..2] (Channel program for generic I/O):
1394 * 0: prepare
1395 * 1: read or write (depending on direction) with fixed
1396 * buffer (idal allocated once when buffer is allocated)
1397 * 2: nop
1398 * ccw[3..5] (Channel program for direct write of packets)
1399 * 3: prepare
1400 * 4: write (idal allocated on every write).
1401 * 5: nop
1402 * ccw[6..7] (Channel program for initial channel setup):
1403 * 6: set extended mode
1404 * 7: nop
1405 *
1406 * ch->ccw[0..5] are initialized in ch_action_start because
1407 * the channel's direction is yet unknown here.
1408 *
1409 * ccws used for xid2 negotiations
1410 * ch-ccw[8-14] need to be used for the XID exchange either
1411 * X side XID2 Processing
1412 * 8: write control
1413 * 9: write th
1414 * 10: write XID
1415 * 11: read th from secondary
1416 * 12: read XID from secondary
1417 * 13: read 4 byte ID
1418 * 14: nop
1419 * Y side XID Processing
1420 * 8: sense
1421 * 9: read th
1422 * 10: read XID
1423 * 11: write th
1424 * 12: write XID
1425 * 13: write 4 byte ID
1426 * 14: nop
1427 *
1428 * ccws used for double noop due to VM timing issues
1429 * which result in unrecoverable Busy on channel
1430 * 15: nop
1431 * 16: nop
1432 */
1433 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1434 ch->ccw[6].flags = CCW_FLAG_SLI;
1435
1436 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1437 ch->ccw[7].flags = CCW_FLAG_SLI;
1438
1439 if (IS_MPC(priv)) {
1440 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1441 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1442 ch->ccw[15].count = TH_HEADER_LENGTH;
1443 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1444
1445 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1446 ch->ccw[16].flags = CCW_FLAG_SLI;
1447
1448 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1449 ctc_ch_event_names, CTC_MPC_NR_STATES,
1450 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1451 mpc_ch_fsm_len, GFP_KERNEL);
1452 } else {
1453 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1454 ctc_ch_event_names, CTC_NR_STATES,
1455 CTC_NR_EVENTS, ch_fsm,
1456 ch_fsm_len, GFP_KERNEL);
1457 }
1458 if (ch->fsm == NULL)
1459 goto nomem_return;
1460
1461 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1462
1463 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1464 if (ch->irb == NULL)
1465 goto nomem_return;
1466
1467 while (*c && ctcm_less_than((*c)->id, ch->id))
1468 c = &(*c)->next;
1469
1470 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1471 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1472 "%s (%s) already in list, using old entry",
1473 __func__, (*c)->id);
1474
1475 goto free_return;
1476 }
1477
1478 spin_lock_init(&ch->collect_lock);
1479
1480 fsm_settimer(ch->fsm, &ch->timer);
1481 skb_queue_head_init(&ch->io_queue);
1482 skb_queue_head_init(&ch->collect_queue);
1483
1484 if (IS_MPC(priv)) {
1485 fsm_settimer(ch->fsm, &ch->sweep_timer);
1486 skb_queue_head_init(&ch->sweep_queue);
1487 }
1488 ch->next = *c;
1489 *c = ch;
1490 return 0;
1491
1492 nomem_return:
1493 rc = -ENOMEM;
1494
1495 free_return: /* note that all channel pointers are 0 or valid */
1496 kfree(ch->ccw);
1497 kfree(ch->discontact_th);
1498 kfree_fsm(ch->fsm);
1499 kfree(ch->irb);
1500 kfree(ch);
1501 return rc;
1502 }
1503
1504 /*
1505 * Return type of a detected device.
1506 */
1507 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1508 {
1509 enum ctcm_channel_types type;
1510 type = (enum ctcm_channel_types)id->driver_info;
1511
1512 if (type == ctcm_channel_type_ficon)
1513 type = ctcm_channel_type_escon;
1514
1515 return type;
1516 }
1517
1518 /**
1519 *
1520 * Setup an interface.
1521 *
1522 * cgdev Device to be setup.
1523 *
1524 * returns 0 on success, !0 on failure.
1525 */
1526 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1527 {
1528 char read_id[CTCM_ID_SIZE];
1529 char write_id[CTCM_ID_SIZE];
1530 int direction;
1531 enum ctcm_channel_types type;
1532 struct ctcm_priv *priv;
1533 struct net_device *dev;
1534 struct ccw_device *cdev0;
1535 struct ccw_device *cdev1;
1536 struct channel *readc;
1537 struct channel *writec;
1538 int ret;
1539 int result;
1540
1541 priv = dev_get_drvdata(&cgdev->dev);
1542 if (!priv) {
1543 result = -ENODEV;
1544 goto out_err_result;
1545 }
1546
1547 cdev0 = cgdev->cdev[0];
1548 cdev1 = cgdev->cdev[1];
1549
1550 type = get_channel_type(&cdev0->id);
1551
1552 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1553 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1554
1555 ret = add_channel(cdev0, type, priv);
1556 if (ret) {
1557 result = ret;
1558 goto out_err_result;
1559 }
1560 ret = add_channel(cdev1, type, priv);
1561 if (ret) {
1562 result = ret;
1563 goto out_remove_channel1;
1564 }
1565
1566 ret = ccw_device_set_online(cdev0);
1567 if (ret != 0) {
1568 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1569 "%s(%s) set_online rc=%d",
1570 CTCM_FUNTAIL, read_id, ret);
1571 result = -EIO;
1572 goto out_remove_channel2;
1573 }
1574
1575 ret = ccw_device_set_online(cdev1);
1576 if (ret != 0) {
1577 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1578 "%s(%s) set_online rc=%d",
1579 CTCM_FUNTAIL, write_id, ret);
1580
1581 result = -EIO;
1582 goto out_ccw1;
1583 }
1584
1585 dev = ctcm_init_netdevice(priv);
1586 if (dev == NULL) {
1587 result = -ENODEV;
1588 goto out_ccw2;
1589 }
1590
1591 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1592 priv->channel[direction] =
1593 channel_get(type, direction == CTCM_READ ?
1594 read_id : write_id, direction);
1595 if (priv->channel[direction] == NULL) {
1596 if (direction == CTCM_WRITE)
1597 channel_free(priv->channel[CTCM_READ]);
1598 goto out_dev;
1599 }
1600 priv->channel[direction]->netdev = dev;
1601 priv->channel[direction]->protocol = priv->protocol;
1602 priv->channel[direction]->max_bufsize = priv->buffer_size;
1603 }
1604 /* sysfs magic */
1605 SET_NETDEV_DEV(dev, &cgdev->dev);
1606
1607 if (register_netdev(dev)) {
1608 result = -ENODEV;
1609 goto out_dev;
1610 }
1611
1612 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1613
1614 dev_info(&dev->dev,
1615 "setup OK : r/w = %s/%s, protocol : %d\n",
1616 priv->channel[CTCM_READ]->id,
1617 priv->channel[CTCM_WRITE]->id, priv->protocol);
1618
1619 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1620 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1621 priv->channel[CTCM_READ]->id,
1622 priv->channel[CTCM_WRITE]->id, priv->protocol);
1623
1624 return 0;
1625 out_dev:
1626 ctcm_free_netdevice(dev);
1627 out_ccw2:
1628 ccw_device_set_offline(cgdev->cdev[1]);
1629 out_ccw1:
1630 ccw_device_set_offline(cgdev->cdev[0]);
1631 out_remove_channel2:
1632 readc = channel_get(type, read_id, CTCM_READ);
1633 channel_remove(readc);
1634 out_remove_channel1:
1635 writec = channel_get(type, write_id, CTCM_WRITE);
1636 channel_remove(writec);
1637 out_err_result:
1638 return result;
1639 }
1640
1641 /**
1642 * Shutdown an interface.
1643 *
1644 * cgdev Device to be shut down.
1645 *
1646 * returns 0 on success, !0 on failure.
1647 */
1648 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1649 {
1650 struct ctcm_priv *priv;
1651 struct net_device *dev;
1652
1653 priv = dev_get_drvdata(&cgdev->dev);
1654 if (!priv)
1655 return -ENODEV;
1656
1657 if (priv->channel[CTCM_READ]) {
1658 dev = priv->channel[CTCM_READ]->netdev;
1659 CTCM_DBF_DEV(SETUP, dev, "");
1660 /* Close the device */
1661 ctcm_close(dev);
1662 dev->flags &= ~IFF_RUNNING;
1663 channel_free(priv->channel[CTCM_READ]);
1664 } else
1665 dev = NULL;
1666
1667 if (priv->channel[CTCM_WRITE])
1668 channel_free(priv->channel[CTCM_WRITE]);
1669
1670 if (dev) {
1671 unregister_netdev(dev);
1672 ctcm_free_netdevice(dev);
1673 }
1674
1675 if (priv->fsm)
1676 kfree_fsm(priv->fsm);
1677
1678 ccw_device_set_offline(cgdev->cdev[1]);
1679 ccw_device_set_offline(cgdev->cdev[0]);
1680 channel_remove(priv->channel[CTCM_READ]);
1681 channel_remove(priv->channel[CTCM_WRITE]);
1682 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1683
1684 return 0;
1685
1686 }
1687
1688
1689 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1690 {
1691 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1692
1693 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1694 "removing device %p, proto : %d",
1695 cgdev, priv->protocol);
1696
1697 if (cgdev->state == CCWGROUP_ONLINE)
1698 ctcm_shutdown_device(cgdev);
1699 dev_set_drvdata(&cgdev->dev, NULL);
1700 kfree(priv);
1701 put_device(&cgdev->dev);
1702 }
1703
1704 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1705 {
1706 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1707
1708 if (gdev->state == CCWGROUP_OFFLINE)
1709 return 0;
1710 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1711 ctcm_close(priv->channel[CTCM_READ]->netdev);
1712 if (!wait_event_timeout(priv->fsm->wait_q,
1713 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1714 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1715 return -EBUSY;
1716 }
1717 ccw_device_set_offline(gdev->cdev[1]);
1718 ccw_device_set_offline(gdev->cdev[0]);
1719 return 0;
1720 }
1721
1722 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1723 {
1724 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1725 int rc;
1726
1727 if (gdev->state == CCWGROUP_OFFLINE)
1728 return 0;
1729 rc = ccw_device_set_online(gdev->cdev[1]);
1730 if (rc)
1731 goto err_out;
1732 rc = ccw_device_set_online(gdev->cdev[0]);
1733 if (rc)
1734 goto err_out;
1735 ctcm_open(priv->channel[CTCM_READ]->netdev);
1736 err_out:
1737 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1738 return rc;
1739 }
1740
1741 static struct ccw_device_id ctcm_ids[] = {
1742 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1743 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1744 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1745 {},
1746 };
1747 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1748
1749 static struct ccw_driver ctcm_ccw_driver = {
1750 .driver = {
1751 .owner = THIS_MODULE,
1752 .name = "ctcm",
1753 },
1754 .ids = ctcm_ids,
1755 .probe = ccwgroup_probe_ccwdev,
1756 .remove = ccwgroup_remove_ccwdev,
1757 .int_class = IRQIO_CTC,
1758 };
1759
1760 static struct ccwgroup_driver ctcm_group_driver = {
1761 .driver = {
1762 .owner = THIS_MODULE,
1763 .name = CTC_DRIVER_NAME,
1764 },
1765 .ccw_driver = &ctcm_ccw_driver,
1766 .setup = ctcm_probe_device,
1767 .remove = ctcm_remove_device,
1768 .set_online = ctcm_new_device,
1769 .set_offline = ctcm_shutdown_device,
1770 .freeze = ctcm_pm_suspend,
1771 .thaw = ctcm_pm_resume,
1772 .restore = ctcm_pm_resume,
1773 };
1774
1775 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1776 size_t count)
1777 {
1778 int err;
1779
1780 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1781 return err ? err : count;
1782 }
1783 static DRIVER_ATTR_WO(group);
1784
1785 static struct attribute *ctcm_drv_attrs[] = {
1786 &driver_attr_group.attr,
1787 NULL,
1788 };
1789 static struct attribute_group ctcm_drv_attr_group = {
1790 .attrs = ctcm_drv_attrs,
1791 };
1792 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1793 &ctcm_drv_attr_group,
1794 NULL,
1795 };
1796
1797 /*
1798 * Module related routines
1799 */
1800
1801 /*
1802 * Prepare to be unloaded. Free IRQ's and release all resources.
1803 * This is called just before this module is unloaded. It is
1804 * not called, if the usage count is !0, so we don't need to check
1805 * for that.
1806 */
1807 static void __exit ctcm_exit(void)
1808 {
1809 ccwgroup_driver_unregister(&ctcm_group_driver);
1810 ccw_driver_unregister(&ctcm_ccw_driver);
1811 root_device_unregister(ctcm_root_dev);
1812 ctcm_unregister_dbf_views();
1813 pr_info("CTCM driver unloaded\n");
1814 }
1815
1816 /*
1817 * Print Banner.
1818 */
1819 static void print_banner(void)
1820 {
1821 pr_info("CTCM driver initialized\n");
1822 }
1823
1824 /**
1825 * Initialize module.
1826 * This is called just after the module is loaded.
1827 *
1828 * returns 0 on success, !0 on error.
1829 */
1830 static int __init ctcm_init(void)
1831 {
1832 int ret;
1833
1834 channels = NULL;
1835
1836 ret = ctcm_register_dbf_views();
1837 if (ret)
1838 goto out_err;
1839 ctcm_root_dev = root_device_register("ctcm");
1840 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1841 if (ret)
1842 goto register_err;
1843 ret = ccw_driver_register(&ctcm_ccw_driver);
1844 if (ret)
1845 goto ccw_err;
1846 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1847 ret = ccwgroup_driver_register(&ctcm_group_driver);
1848 if (ret)
1849 goto ccwgroup_err;
1850 print_banner();
1851 return 0;
1852
1853 ccwgroup_err:
1854 ccw_driver_unregister(&ctcm_ccw_driver);
1855 ccw_err:
1856 root_device_unregister(ctcm_root_dev);
1857 register_err:
1858 ctcm_unregister_dbf_views();
1859 out_err:
1860 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1861 __func__, ret);
1862 return ret;
1863 }
1864
1865 module_init(ctcm_init);
1866 module_exit(ctcm_exit);
1867
1868 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1869 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1870 MODULE_LICENSE("GPL");
1871
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