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s390/comments: unify copyright messages and remove file names
[deliverable/linux.git] / drivers / s390 / net / ctcm_main.c
CommitLineData
293d984f 1/*
b8a2d42a 2 * Copyright IBM Corp. 2001, 2009
293d984f
PT		 3 * Author(s):
4 * Original CTC driver(s):
5 * Fritz Elfert (felfert@millenux.com)
6 * Dieter Wellerdiek (wel@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Denis Joseph Barrow (barrow_dj@yahoo.com)
9 * Jochen Roehrig (roehrig@de.ibm.com)
10 * Cornelia Huck <cornelia.huck@de.ibm.com>
11 * MPC additions:
12 * Belinda Thompson (belindat@us.ibm.com)
13 * Andy Richter (richtera@us.ibm.com)
14 * Revived by:
15 * Peter Tiedemann (ptiedem@de.ibm.com)
16 */
17
18#undef DEBUG
19#undef DEBUGDATA
20#undef DEBUGCCW
21
2a7c6f2c
PT		 22#define KMSG_COMPONENT "ctcm"
23#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
24
293d984f
PT		 25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/interrupt.h>
32#include <linux/timer.h>
33#include <linux/bitops.h>
34
35#include <linux/signal.h>
36#include <linux/string.h>
37
38#include <linux/ip.h>
39#include <linux/if_arp.h>
40#include <linux/tcp.h>
41#include <linux/skbuff.h>
42#include <linux/ctype.h>
43#include <net/dst.h>
44
45#include <linux/io.h>
46#include <asm/ccwdev.h>
47#include <asm/ccwgroup.h>
48#include <linux/uaccess.h>
49
50#include <asm/idals.h>
51
293d984f
PT		 52#include "ctcm_fsms.h"
53#include "ctcm_main.h"
54
55/* Some common global variables */
56
0ca8cc6f
UB		 57/**
58 * The root device for ctcm group devices
59 */
60static struct device *ctcm_root_dev;
61
293d984f
PT		 62/*
63 * Linked list of all detected channels.
64 */
65struct channel *channels;
66
67/**
68 * Unpack a just received skb and hand it over to
69 * upper layers.
70 *
71 * ch The channel where this skb has been received.
72 * pskb The received skb.
73 */
74void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
75{
76 struct net_device *dev = ch->netdev;
261893d3 77 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 78 __u16 len = *((__u16 *) pskb->data);
79
80 skb_put(pskb, 2 + LL_HEADER_LENGTH);
81 skb_pull(pskb, 2);
82 pskb->dev = dev;
83 pskb->ip_summed = CHECKSUM_UNNECESSARY;
84 while (len > 0) {
85 struct sk_buff *skb;
86 int skblen;
87 struct ll_header *header = (struct ll_header *)pskb->data;
88
89 skb_pull(pskb, LL_HEADER_LENGTH);
90 if ((ch->protocol == CTCM_PROTO_S390) &&
91 (header->type != ETH_P_IP)) {
293d984f 92 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
aa3f2cb6 93 ch->logflags |= LOG_FLAG_ILLEGALPKT;
293d984f
PT		 94 /*
95 * Check packet type only if we stick strictly
96 * to S/390's protocol of OS390. This only
97 * supports IP. Otherwise allow any packet
98 * type.
99 */
aa3f2cb6
PT		 100 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
101 "%s(%s): Illegal packet type 0x%04x"
102 " - dropping",
103 CTCM_FUNTAIL, dev->name, header->type);
293d984f 104 }
293d984f
PT		 105 priv->stats.rx_dropped++;
106 priv->stats.rx_frame_errors++;
107 return;
108 }
109 pskb->protocol = ntohs(header->type);
fb8585fc
RK		 110 if ((header->length <= LL_HEADER_LENGTH) ||
111 (len <= LL_HEADER_LENGTH)) {
293d984f 112 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
aa3f2cb6
PT		 113 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
114 "%s(%s): Illegal packet size %d(%d,%d)"
115 "- dropping",
116 CTCM_FUNTAIL, dev->name,
117 header->length, dev->mtu, len);
293d984f
PT		 118 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
119 }
120
121 priv->stats.rx_dropped++;
122 priv->stats.rx_length_errors++;
123 return;
124 }
125 header->length -= LL_HEADER_LENGTH;
126 len -= LL_HEADER_LENGTH;
127 if ((header->length > skb_tailroom(pskb)) ||
128 (header->length > len)) {
129 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
aa3f2cb6
PT		 130 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
131 "%s(%s): Packet size %d (overrun)"
132 " - dropping", CTCM_FUNTAIL,
133 dev->name, header->length);
293d984f
PT		 134 ch->logflags |= LOG_FLAG_OVERRUN;
135 }
136
137 priv->stats.rx_dropped++;
138 priv->stats.rx_length_errors++;
139 return;
140 }
141 skb_put(pskb, header->length);
142 skb_reset_mac_header(pskb);
143 len -= header->length;
144 skb = dev_alloc_skb(pskb->len);
145 if (!skb) {
146 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
aa3f2cb6
PT		 147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
148 "%s(%s): MEMORY allocation error",
149 CTCM_FUNTAIL, dev->name);
293d984f
PT		 150 ch->logflags |= LOG_FLAG_NOMEM;
151 }
152 priv->stats.rx_dropped++;
153 return;
154 }
155 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
156 pskb->len);
157 skb_reset_mac_header(skb);
158 skb->dev = pskb->dev;
159 skb->protocol = pskb->protocol;
160 pskb->ip_summed = CHECKSUM_UNNECESSARY;
161 skblen = skb->len;
162 /*
163 * reset logflags
164 */
165 ch->logflags = 0;
166 priv->stats.rx_packets++;
167 priv->stats.rx_bytes += skblen;
168 netif_rx_ni(skb);
293d984f
PT		 169 if (len > 0) {
170 skb_pull(pskb, header->length);
171 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
e2fc8cb4
JF		 172 CTCM_DBF_DEV_NAME(TRACE, dev,
173 "Overrun in ctcm_unpack_skb");
174 ch->logflags |= LOG_FLAG_OVERRUN;
293d984f
PT		 175 return;
176 }
177 skb_put(pskb, LL_HEADER_LENGTH);
178 }
179 }
180}
181
182/**
183 * Release a specific channel in the channel list.
184 *
185 * ch Pointer to channel struct to be released.
186 */
187static void channel_free(struct channel *ch)
188{
aa3f2cb6 189 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
293d984f
PT		 190 ch->flags &= ~CHANNEL_FLAGS_INUSE;
191 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
192}
193
194/**
195 * Remove a specific channel in the channel list.
196 *
197 * ch Pointer to channel struct to be released.
198 */
199static void channel_remove(struct channel *ch)
200{
201 struct channel **c = &channels;
202 char chid[CTCM_ID_SIZE+1];
203 int ok = 0;
204
205 if (ch == NULL)
206 return;
207 else
208 strncpy(chid, ch->id, CTCM_ID_SIZE);
209
210 channel_free(ch);
211 while (*c) {
212 if (*c == ch) {
213 *c = ch->next;
214 fsm_deltimer(&ch->timer);
215 if (IS_MPC(ch))
216 fsm_deltimer(&ch->sweep_timer);
217
218 kfree_fsm(ch->fsm);
219 clear_normalized_cda(&ch->ccw[4]);
220 if (ch->trans_skb != NULL) {
221 clear_normalized_cda(&ch->ccw[1]);
222 dev_kfree_skb_any(ch->trans_skb);
223 }
224 if (IS_MPC(ch)) {
225 tasklet_kill(&ch->ch_tasklet);
226 tasklet_kill(&ch->ch_disc_tasklet);
227 kfree(ch->discontact_th);
228 }
229 kfree(ch->ccw);
230 kfree(ch->irb);
231 kfree(ch);
232 ok = 1;
233 break;
234 }
235 c = &((*c)->next);
236 }
237
238 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
239 chid, ok ? "OK" : "failed");
240}
241
242/**
243 * Get a specific channel from the channel list.
244 *
245 * type Type of channel we are interested in.
246 * id Id of channel we are interested in.
247 * direction Direction we want to use this channel for.
248 *
249 * returns Pointer to a channel or NULL if no matching channel available.
250 */
0ca8cc6f 251static struct channel *channel_get(enum ctcm_channel_types type,
293d984f
PT		 252 char *id, int direction)
253{
254 struct channel *ch = channels;
255
293d984f
PT		 256 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
257 ch = ch->next;
258 if (!ch) {
aa3f2cb6
PT		 259 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
260 "%s(%d, %s, %d) not found in channel list\n",
293d984f 261 CTCM_FUNTAIL, type, id, direction);
293d984f
PT		 262 } else {
263 if (ch->flags & CHANNEL_FLAGS_INUSE)
264 ch = NULL;
265 else {
266 ch->flags |= CHANNEL_FLAGS_INUSE;
267 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
3c09e264 268 ch->flags |= (direction == CTCM_WRITE)
293d984f
PT		 269 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
270 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
271 }
272 }
273 return ch;
274}
275
276static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
277{
278 if (!IS_ERR(irb))
279 return 0;
280
aa3f2cb6
PT		 281 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
282 "irb error %ld on device %s\n",
2a0217d5 283 PTR_ERR(irb), dev_name(&cdev->dev));
293d984f
PT		 284
285 switch (PTR_ERR(irb)) {
286 case -EIO:
2a7c6f2c
PT		 287 dev_err(&cdev->dev,
288 "An I/O-error occurred on the CTCM device\n");
293d984f
PT		 289 break;
290 case -ETIMEDOUT:
2a7c6f2c
PT		 291 dev_err(&cdev->dev,
292 "An adapter hardware operation timed out\n");
293d984f
PT		 293 break;
294 default:
2a7c6f2c
PT		 295 dev_err(&cdev->dev,
296 "An error occurred on the adapter hardware\n");
293d984f
PT		 297 }
298 return PTR_ERR(irb);
299}
300
301
302/**
303 * Check sense of a unit check.
304 *
305 * ch The channel, the sense code belongs to.
306 * sense The sense code to inspect.
307 */
aa3f2cb6 308static inline void ccw_unit_check(struct channel *ch, __u8 sense)
293d984f 309{
aa3f2cb6
PT		 310 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
311 "%s(%s): %02x",
312 CTCM_FUNTAIL, ch->id, sense);
313
293d984f
PT		 314 if (sense & SNS0_INTERVENTION_REQ) {
315 if (sense & 0x01) {
aa3f2cb6 316 if (ch->sense_rc != 0x01) {
2a7c6f2c
PT		 317 pr_notice(
318 "%s: The communication peer has "
319 "disconnected\n", ch->id);
aa3f2cb6
PT		 320 ch->sense_rc = 0x01;
321 }
293d984f
PT		 322 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
323 } else {
aa3f2cb6 324 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
2a7c6f2c
PT		 325 pr_notice(
326 "%s: The remote operating system is "
327 "not available\n", ch->id);
aa3f2cb6
PT		 328 ch->sense_rc = SNS0_INTERVENTION_REQ;
329 }
293d984f
PT		 330 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
331 }
332 } else if (sense & SNS0_EQUIPMENT_CHECK) {
333 if (sense & SNS0_BUS_OUT_CHECK) {
aa3f2cb6
PT		 334 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
335 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
336 "%s(%s): remote HW error %02x",
337 CTCM_FUNTAIL, ch->id, sense);
338 ch->sense_rc = SNS0_BUS_OUT_CHECK;
339 }
293d984f
PT		 340 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
341 } else {
aa3f2cb6
PT		 342 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
343 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
344 "%s(%s): remote read parity error %02x",
345 CTCM_FUNTAIL, ch->id, sense);
346 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
347 }
293d984f
PT		 348 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
349 }
350 } else if (sense & SNS0_BUS_OUT_CHECK) {
aa3f2cb6
PT		 351 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
352 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
353 "%s(%s): BUS OUT error %02x",
354 CTCM_FUNTAIL, ch->id, sense);
355 ch->sense_rc = SNS0_BUS_OUT_CHECK;
356 }
357 if (sense & 0x04) /* data-streaming timeout */
293d984f 358 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
aa3f2cb6 359 else /* Data-transfer parity error */
293d984f 360 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
293d984f 361 } else if (sense & SNS0_CMD_REJECT) {
aa3f2cb6
PT		 362 if (ch->sense_rc != SNS0_CMD_REJECT) {
363 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
364 "%s(%s): Command rejected",
365 CTCM_FUNTAIL, ch->id);
366 ch->sense_rc = SNS0_CMD_REJECT;
367 }
293d984f 368 } else if (sense == 0) {
aa3f2cb6
PT		 369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
370 "%s(%s): Unit check ZERO",
371 CTCM_FUNTAIL, ch->id);
293d984f
PT		 372 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
373 } else {
aa3f2cb6
PT		 374 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
375 "%s(%s): Unit check code %02x unknown",
376 CTCM_FUNTAIL, ch->id, sense);
293d984f
PT		 377 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
378 }
379}
380
381int ctcm_ch_alloc_buffer(struct channel *ch)
382{
293d984f
PT		 383 clear_normalized_cda(&ch->ccw[1]);
384 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
385 if (ch->trans_skb == NULL) {
aa3f2cb6
PT		 386 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
387 "%s(%s): %s trans_skb allocation error",
388 CTCM_FUNTAIL, ch->id,
3c09e264
UB		 389 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
390 "RX" : "TX");
293d984f
PT		 391 return -ENOMEM;
392 }
393
394 ch->ccw[1].count = ch->max_bufsize;
395 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
396 dev_kfree_skb(ch->trans_skb);
397 ch->trans_skb = NULL;
aa3f2cb6
PT		 398 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
399 "%s(%s): %s set norm_cda failed",
400 CTCM_FUNTAIL, ch->id,
3c09e264
UB		 401 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
402 "RX" : "TX");
293d984f
PT		 403 return -ENOMEM;
404 }
405
406 ch->ccw[1].count = 0;
407 ch->trans_skb_data = ch->trans_skb->data;
408 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
409 return 0;
410}
411
412/*
413 * Interface API for upper network layers
414 */
415
416/**
417 * Open an interface.
418 * Called from generic network layer when ifconfig up is run.
419 *
420 * dev Pointer to interface struct.
421 *
422 * returns 0 on success, -ERRNO on failure. (Never fails.)
423 */
424int ctcm_open(struct net_device *dev)
425{
261893d3 426 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 427
428 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
429 if (!IS_MPC(priv))
430 fsm_event(priv->fsm, DEV_EVENT_START, dev);
431 return 0;
432}
433
434/**
435 * Close an interface.
436 * Called from generic network layer when ifconfig down is run.
437 *
438 * dev Pointer to interface struct.
439 *
440 * returns 0 on success, -ERRNO on failure. (Never fails.)
441 */
442int ctcm_close(struct net_device *dev)
443{
261893d3 444 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 445
446 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
447 if (!IS_MPC(priv))
448 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
449 return 0;
450}
451
452
453/**
454 * Transmit a packet.
455 * This is a helper function for ctcm_tx().
456 *
457 * ch Channel to be used for sending.
458 * skb Pointer to struct sk_buff of packet to send.
459 * The linklevel header has already been set up
460 * by ctcm_tx().
461 *
462 * returns 0 on success, -ERRNO on failure. (Never fails.)
463 */
464static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
465{
466 unsigned long saveflags;
467 struct ll_header header;
468 int rc = 0;
469 __u16 block_len;
470 int ccw_idx;
471 struct sk_buff *nskb;
472 unsigned long hi;
473
474 /* we need to acquire the lock for testing the state
475 * otherwise we can have an IRQ changing the state to
476 * TXIDLE after the test but before acquiring the lock.
477 */
478 spin_lock_irqsave(&ch->collect_lock, saveflags);
479 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
480 int l = skb->len + LL_HEADER_LENGTH;
481
482 if (ch->collect_len + l > ch->max_bufsize - 2) {
483 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
484 return -EBUSY;
485 } else {
486 atomic_inc(&skb->users);
487 header.length = l;
488 header.type = skb->protocol;
489 header.unused = 0;
490 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
491 LL_HEADER_LENGTH);
492 skb_queue_tail(&ch->collect_queue, skb);
493 ch->collect_len += l;
494 }
495 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
496 goto done;
497 }
498 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
499 /*
500 * Protect skb against beeing free'd by upper
501 * layers.
502 */
503 atomic_inc(&skb->users);
504 ch->prof.txlen += skb->len;
505 header.length = skb->len + LL_HEADER_LENGTH;
506 header.type = skb->protocol;
507 header.unused = 0;
508 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
509 block_len = skb->len + 2;
510 *((__u16 *)skb_push(skb, 2)) = block_len;
511
512 /*
513 * IDAL support in CTCM is broken, so we have to
514 * care about skb's above 2G ourselves.
515 */
516 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
517 if (hi) {
518 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
519 if (!nskb) {
520 atomic_dec(&skb->users);
521 skb_pull(skb, LL_HEADER_LENGTH + 2);
522 ctcm_clear_busy(ch->netdev);
523 return -ENOMEM;
524 } else {
525 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
526 atomic_inc(&nskb->users);
527 atomic_dec(&skb->users);
528 dev_kfree_skb_irq(skb);
529 skb = nskb;
530 }
531 }
532
533 ch->ccw[4].count = block_len;
534 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
535 /*
536 * idal allocation failed, try via copying to
537 * trans_skb. trans_skb usually has a pre-allocated
538 * idal.
539 */
540 if (ctcm_checkalloc_buffer(ch)) {
541 /*
542 * Remove our header. It gets added
543 * again on retransmit.
544 */
545 atomic_dec(&skb->users);
546 skb_pull(skb, LL_HEADER_LENGTH + 2);
547 ctcm_clear_busy(ch->netdev);
aa3f2cb6 548 return -ENOMEM;
293d984f
PT		 549 }
550
551 skb_reset_tail_pointer(ch->trans_skb);
552 ch->trans_skb->len = 0;
553 ch->ccw[1].count = skb->len;
554 skb_copy_from_linear_data(skb,
555 skb_put(ch->trans_skb, skb->len), skb->len);
556 atomic_dec(&skb->users);
557 dev_kfree_skb_irq(skb);
558 ccw_idx = 0;
559 } else {
560 skb_queue_tail(&ch->io_queue, skb);
561 ccw_idx = 3;
562 }
ce1f8938
UB		 563 if (do_debug_ccw)
564 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
565 sizeof(struct ccw1) * 3);
293d984f
PT		 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;
261893d3 588 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
592done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595}
596
597static 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;
aa3f2cb6 605 /* int rc = 0; */
293d984f 606
261893d3 607 priv = dev->ml_priv;
293d984f 608 grp = priv->mpcg;
3c09e264 609 ch = priv->channel[CTCM_WRITE];
293d984f 610
293d984f
PT		 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;
3c09e264
UB		 615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
293d984f
PT		 617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
aa3f2cb6
PT		 622 /* rc = -ENOMEM; */
623 goto nomem;
293d984f
PT		 624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
aa3f2cb6
PT		 630 /* rc = -ENOMEM; */
631 goto nomem;
293d984f
PT		 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
aa3f2cb6
PT		 652nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
293d984f
PT		 656
657 return;
658}
659
660/*
661 * MPC mode version of transmit_skb
662 */
663static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664{
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
261893d3 667 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 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 */
293d984f 675
aa3f2cb6
PT		 676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
293d984f
PT		 679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 atomic_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
293d984f 686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
aa3f2cb6 687 goto nomem_exit;
293d984f
PT		 688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (skb->protocol == ntohs(ETH_P_SNAP)) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
aa3f2cb6
PT		 702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
293d984f
PT		 706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 atomic_inc(&skb->users);
720
293d984f
PT		 721 /*
722 * IDAL support in CTCM is broken, so we have to
723 * care about skb's above 2G ourselves.
724 */
725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726 if (hi) {
727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728 if (!nskb) {
aa3f2cb6 729 goto nomem_exit;
293d984f
PT		 730 } else {
731 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
732 atomic_inc(&nskb->users);
733 atomic_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
aa3f2cb6
PT		 741 if (!p_header)
742 goto nomem_exit;
293d984f
PT		 743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (skb->protocol == ntohs(ETH_P_SNAP)) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
aa3f2cb6
PT		 772 if (!header)
773 goto nomem_exit;
293d984f
PT		 774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
aa3f2cb6
PT		 782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
293d984f
PT		 784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
aa3f2cb6
PT		 790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
293d984f
PT		 794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
aa3f2cb6
PT		 798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
293d984f
PT		 800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
aa3f2cb6
PT		 803 * Remove our header.
804 * It gets added again on retransmit.
293d984f 805 */
aa3f2cb6 806 goto nomem_exit;
293d984f
PT		 807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
813 atomic_dec(&skb->users);
814 dev_kfree_skb_irq(skb);
815 ccw_idx = 0;
aa3f2cb6
PT		 816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817 "up to 32 bytes sent to vtam:\n",
818 __func__, dev->name, ch->trans_skb->len);
819 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820 min_t(int, 32, ch->trans_skb->len));
293d984f
PT		 821 } else {
822 skb_queue_tail(&ch->io_queue, skb);
823 ccw_idx = 3;
824 }
825 ch->retry = 0;
826 fsm_newstate(ch->fsm, CTC_STATE_TX);
827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829 if (do_debug_ccw)
830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831 sizeof(struct ccw1) * 3);
832
833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834 ch->prof.send_stamp = current_kernel_time(); /* xtime */
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
aa3f2cb6 849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
293d984f
PT		 850 ctcmpc_send_sweep_req(ch);
851
aa3f2cb6
PT		 852 goto done;
853nomem_exit:
854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855 "%s(%s): MEMORY allocation ERROR\n",
856 CTCM_FUNTAIL, ch->id);
857 rc = -ENOMEM;
858 atomic_dec(&skb->users);
859 dev_kfree_skb_any(skb);
860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
293d984f 861done:
aa3f2cb6
PT		 862 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
863 return rc;
293d984f
PT		 864}
865
866/**
867 * Start transmission of a packet.
868 * Called from generic network device layer.
869 *
870 * skb Pointer to buffer containing the packet.
871 * dev Pointer to interface struct.
872 *
873 * returns 0 if packet consumed, !0 if packet rejected.
874 * Note: If we return !0, then the packet is free'd by
875 * the generic network layer.
876 */
877/* first merge version - leaving both functions separated */
878static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
879{
261893d3 880 struct ctcm_priv *priv = dev->ml_priv;
293d984f
PT		 881
882 if (skb == NULL) {
aa3f2cb6
PT		 883 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
884 "%s(%s): NULL sk_buff passed",
885 CTCM_FUNTAIL, dev->name);
293d984f 886 priv->stats.tx_dropped++;
6ed10654 887 return NETDEV_TX_OK;
293d984f
PT		 888 }
889 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
aa3f2cb6
PT		 890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891 "%s(%s): Got sk_buff with head room < %ld bytes",
892 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
293d984f
PT		 893 dev_kfree_skb(skb);
894 priv->stats.tx_dropped++;
6ed10654 895 return NETDEV_TX_OK;
293d984f
PT		 896 }
897
898 /*
899 * If channels are not running, try to restart them
900 * and throw away packet.
901 */
902 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
903 fsm_event(priv->fsm, DEV_EVENT_START, dev);
904 dev_kfree_skb(skb);
905 priv->stats.tx_dropped++;
906 priv->stats.tx_errors++;
907 priv->stats.tx_carrier_errors++;
6ed10654 908 return NETDEV_TX_OK;
293d984f
PT		 909 }
910
911 if (ctcm_test_and_set_busy(dev))
3a05d140 912 return NETDEV_TX_BUSY;
293d984f
PT		 913
914 dev->trans_start = jiffies;
3c09e264 915 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
3a05d140 916 return NETDEV_TX_BUSY;
6ed10654 917 return NETDEV_TX_OK;
293d984f
PT		 918}
919
920/* unmerged MPC variant of ctcm_tx */
921static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
922{
923 int len = 0;
261893d3 924 struct ctcm_priv *priv = dev->ml_priv;
aa3f2cb6 925 struct mpc_group *grp = priv->mpcg;
293d984f
PT		 926 struct sk_buff *newskb = NULL;
927
293d984f
PT		 928 /*
929 * Some sanity checks ...
930 */
931 if (skb == NULL) {
aa3f2cb6
PT		 932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933 "%s(%s): NULL sk_buff passed",
934 CTCM_FUNTAIL, dev->name);
293d984f
PT		 935 priv->stats.tx_dropped++;
936 goto done;
937 }
938 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
aa3f2cb6
PT		 939 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
940 "%s(%s): Got sk_buff with head room < %ld bytes",
941 CTCM_FUNTAIL, dev->name,
942 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
293d984f 943
aa3f2cb6 944 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
293d984f
PT		 945
946 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
947 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
948
949 if (!newskb) {
aa3f2cb6
PT		 950 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
951 "%s: %s: __dev_alloc_skb failed",
952 __func__, dev->name);
293d984f
PT		 953
954 dev_kfree_skb_any(skb);
955 priv->stats.tx_dropped++;
956 priv->stats.tx_errors++;
957 priv->stats.tx_carrier_errors++;
958 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
959 goto done;
960 }
961 newskb->protocol = skb->protocol;
962 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
963 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
964 dev_kfree_skb_any(skb);
965 skb = newskb;
966 }
967
968 /*
969 * If channels are not running,
970 * notify anybody about a link failure and throw
971 * away packet.
972 */
973 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
974 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
975 dev_kfree_skb_any(skb);
aa3f2cb6
PT		 976 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
977 "%s(%s): inactive MPCGROUP - dropped",
978 CTCM_FUNTAIL, dev->name);
293d984f
PT		 979 priv->stats.tx_dropped++;
980 priv->stats.tx_errors++;
981 priv->stats.tx_carrier_errors++;
982 goto done;
983 }
984
985 if (ctcm_test_and_set_busy(dev)) {
aa3f2cb6
PT		 986 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
987 "%s(%s): device busy - dropped",
988 CTCM_FUNTAIL, dev->name);
293d984f
PT		 989 dev_kfree_skb_any(skb);
990 priv->stats.tx_dropped++;
991 priv->stats.tx_errors++;
992 priv->stats.tx_carrier_errors++;
993 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
994 goto done;
995 }
996
997 dev->trans_start = jiffies;
3c09e264 998 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
aa3f2cb6
PT		 999 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000 "%s(%s): device error - dropped",
1001 CTCM_FUNTAIL, dev->name);
293d984f
PT		 1002 dev_kfree_skb_any(skb);
1003 priv->stats.tx_dropped++;
1004 priv->stats.tx_errors++;
1005 priv->stats.tx_carrier_errors++;
1006 ctcm_clear_busy(dev);
1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008 goto done;
1009 }
1010 ctcm_clear_busy(dev);
1011done:
1012 if (do_debug)
1013 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
6ed10654 1015 return NETDEV_TX_OK; /* handle freeing of skb here */
293d984f
PT		 1016}
1017
1018
1019/**
1020 * Sets MTU of an interface.
1021 *
1022 * dev Pointer to interface struct.
1023 * new_mtu The new MTU to use for this interface.
1024 *
1025 * returns 0 on success, -EINVAL if MTU is out of valid range.
1026 * (valid range is 576 .. 65527). If VM is on the
1027 * remote side, maximum MTU is 32760, however this is
1028 * not checked here.
1029 */
1030static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031{
1032 struct ctcm_priv *priv;
1033 int max_bufsize;
1034
293d984f
PT		 1035 if (new_mtu < 576 || new_mtu > 65527)
1036 return -EINVAL;
1037
261893d3 1038 priv = dev->ml_priv;
3c09e264 1039 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
293d984f
PT		 1040
1041 if (IS_MPC(priv)) {
1042 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043 return -EINVAL;
1044 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045 } else {
1046 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047 return -EINVAL;
1048 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049 }
1050 dev->mtu = new_mtu;
1051 return 0;
1052}
1053
1054/**
1055 * Returns interface statistics of a device.
1056 *
1057 * dev Pointer to interface struct.
1058 *
1059 * returns Pointer to stats struct of this interface.
1060 */
1061static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062{
261893d3 1063 return &((struct ctcm_priv *)dev->ml_priv)->stats;
293d984f
PT		 1064}
1065
293d984f
PT		 1066static void ctcm_free_netdevice(struct net_device *dev)
1067{
1068 struct ctcm_priv *priv;
1069 struct mpc_group *grp;
1070
aa3f2cb6
PT		 1071 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072 "%s(%s)", CTCM_FUNTAIL, dev->name);
261893d3 1073 priv = dev->ml_priv;
293d984f
PT		 1074 if (priv) {
1075 grp = priv->mpcg;
1076 if (grp) {
1077 if (grp->fsm)
1078 kfree_fsm(grp->fsm);
1079 if (grp->xid_skb)
1080 dev_kfree_skb(grp->xid_skb);
1081 if (grp->rcvd_xid_skb)
1082 dev_kfree_skb(grp->rcvd_xid_skb);
1083 tasklet_kill(&grp->mpc_tasklet2);
1084 kfree(grp);
1085 priv->mpcg = NULL;
1086 }
1087 if (priv->fsm) {
1088 kfree_fsm(priv->fsm);
1089 priv->fsm = NULL;
1090 }
1091 kfree(priv->xid);
1092 priv->xid = NULL;
1093 /*
1094 * Note: kfree(priv); is done in "opposite" function of
1095 * allocator function probe_device which is remove_device.
1096 */
1097 }
1098#ifdef MODULE
1099 free_netdev(dev);
1100#endif
1101}
1102
1103struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
69b3aa60
FB		 1105static const struct net_device_ops ctcm_netdev_ops = {
1106 .ndo_open = ctcm_open,
1107 .ndo_stop = ctcm_close,
1108 .ndo_get_stats = ctcm_stats,
1109 .ndo_change_mtu = ctcm_change_mtu,
1110 .ndo_start_xmit = ctcm_tx,
1111};
1112
1113static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114 .ndo_open = ctcm_open,
1115 .ndo_stop = ctcm_close,
1116 .ndo_get_stats = ctcm_stats,
1117 .ndo_change_mtu = ctcm_change_mtu,
1118 .ndo_start_xmit = ctcmpc_tx,
1119};
1120
293d984f
PT		 1121void static ctcm_dev_setup(struct net_device *dev)
1122{
293d984f
PT		 1123 dev->type = ARPHRD_SLIP;
1124 dev->tx_queue_len = 100;
1125 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126}
1127
1128/*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133{
1134 struct net_device *dev;
1135 struct mpc_group *grp;
1136 if (!priv)
1137 return NULL;
1138
1139 if (IS_MPC(priv))
1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1141 else
1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1143
1144 if (!dev) {
aa3f2cb6
PT		 1145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1146 "%s: MEMORY allocation ERROR",
1147 CTCM_FUNTAIL);
293d984f
PT		 1148 return NULL;
1149 }
261893d3 1150 dev->ml_priv = priv;
293d984f
PT		 1151 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1152 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1153 dev_fsm, dev_fsm_len, GFP_KERNEL);
1154 if (priv->fsm == NULL) {
1155 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
bc68580d 1156 free_netdev(dev);
293d984f
PT		 1157 return NULL;
1158 }
1159 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1160 fsm_settimer(priv->fsm, &priv->restart_timer);
1161
1162 if (IS_MPC(priv)) {
1163 /* MPC Group Initializations */
1164 grp = ctcmpc_init_mpc_group(priv);
1165 if (grp == NULL) {
1166 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
bc68580d 1167 free_netdev(dev);
293d984f
PT		 1168 return NULL;
1169 }
1170 tasklet_init(&grp->mpc_tasklet2,
1171 mpc_group_ready, (unsigned long)dev);
1172 dev->mtu = MPC_BUFSIZE_DEFAULT -
1173 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1174
69b3aa60 1175 dev->netdev_ops = &ctcm_mpc_netdev_ops;
293d984f
PT		 1176 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1177 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1178 } else {
1179 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
69b3aa60 1180 dev->netdev_ops = &ctcm_netdev_ops;
293d984f
PT		 1181 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1182 }
1183
1184 CTCMY_DBF_DEV(SETUP, dev, "finished");
aa3f2cb6 1185
293d984f
PT		 1186 return dev;
1187}
1188
1189/**
1190 * Main IRQ handler.
1191 *
1192 * cdev The ccw_device the interrupt is for.
1193 * intparm interruption parameter.
1194 * irb interruption response block.
1195 */
1196static void ctcm_irq_handler(struct ccw_device *cdev,
1197 unsigned long intparm, struct irb *irb)
1198{
1199 struct channel *ch;
1200 struct net_device *dev;
1201 struct ctcm_priv *priv;
1202 struct ccwgroup_device *cgdev;
aa3f2cb6
PT		 1203 int cstat;
1204 int dstat;
1205
1206 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
2a0217d5 1207 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
293d984f 1208
293d984f
PT		 1209 if (ctcm_check_irb_error(cdev, irb))
1210 return;
1211
1212 cgdev = dev_get_drvdata(&cdev->dev);
1213
aa3f2cb6
PT		 1214 cstat = irb->scsw.cmd.cstat;
1215 dstat = irb->scsw.cmd.dstat;
1216
293d984f
PT		 1217 /* Check for unsolicited interrupts. */
1218 if (cgdev == NULL) {
2a7c6f2c
PT		 1219 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1220 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1221 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1222 dev_warn(&cdev->dev,
1223 "The adapter received a non-specific IRQ\n");
293d984f
PT		 1224 return;
1225 }
1226
1227 priv = dev_get_drvdata(&cgdev->dev);
1228
1229 /* Try to extract channel from driver data. */
3c09e264
UB		 1230 if (priv->channel[CTCM_READ]->cdev == cdev)
1231 ch = priv->channel[CTCM_READ];
1232 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1233 ch = priv->channel[CTCM_WRITE];
293d984f 1234 else {
2a7c6f2c
PT		 1235 dev_err(&cdev->dev,
1236 "%s: Internal error: Can't determine channel for "
1237 "interrupt device %s\n",
1238 __func__, dev_name(&cdev->dev));
1239 /* Explain: inconsistent internal structures */
293d984f
PT		 1240 return;
1241 }
1242
aa3f2cb6 1243 dev = ch->netdev;
293d984f 1244 if (dev == NULL) {
2a7c6f2c
PT		 1245 dev_err(&cdev->dev,
1246 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1247 __func__, ch);
1248 /* Explain: inconsistent internal structures */
293d984f
PT		 1249 return;
1250 }
1251
293d984f
PT		 1252 /* Copy interruption response block. */
1253 memcpy(ch->irb, irb, sizeof(struct irb));
1254
2a7c6f2c 1255 /* Issue error message and return on subchannel error code */
23d805b6 1256 if (irb->scsw.cmd.cstat) {
293d984f 1257 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
2a7c6f2c
PT		 1258 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1259 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1260 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1261 dev_warn(&cdev->dev,
1262 "A check occurred on the subchannel\n");
293d984f
PT		 1263 return;
1264 }
1265
1266 /* Check the reason-code of a unit check */
23d805b6 1267 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
aa3f2cb6
PT		 1268 if ((irb->ecw[0] & ch->sense_rc) == 0)
1269 /* print it only once */
2a7c6f2c 1270 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
aa3f2cb6
PT		 1271 "%s(%s): sense=%02x, ds=%02x",
1272 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
293d984f
PT		 1273 ccw_unit_check(ch, irb->ecw[0]);
1274 return;
1275 }
23d805b6
PO		 1276 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1277 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
293d984f
PT		 1278 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1279 else
1280 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1281 return;
1282 }
23d805b6 1283 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
293d984f
PT		 1284 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1285 return;
1286 }
23d805b6
PO		 1287 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1288 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1289 (irb->scsw.cmd.stctl ==
293d984f
PT		 1290 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1291 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1292 else
1293 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1294
1295}
1296
20cdffa4
SO		 1297static const struct device_type ctcm_devtype = {
1298 .name = "ctcm",
1299 .groups = ctcm_attr_groups,
1300};
1301
293d984f
PT		 1302/**
1303 * Add ctcm specific attributes.
1304 * Add ctcm private data.
1305 *
1306 * cgdev pointer to ccwgroup_device just added
1307 *
1308 * returns 0 on success, !0 on failure.
1309 */
1310static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1311{
1312 struct ctcm_priv *priv;
293d984f 1313
aa3f2cb6
PT		 1314 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1315 "%s %p",
1316 __func__, cgdev);
293d984f
PT		 1317
1318 if (!get_device(&cgdev->dev))
1319 return -ENODEV;
1320
1321 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1322 if (!priv) {
aa3f2cb6
PT		 1323 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1324 "%s: memory allocation failure",
1325 CTCM_FUNTAIL);
293d984f
PT		 1326 put_device(&cgdev->dev);
1327 return -ENOMEM;
1328 }
293d984f
PT		 1329 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1330 cgdev->cdev[0]->handler = ctcm_irq_handler;
1331 cgdev->cdev[1]->handler = ctcm_irq_handler;
1332 dev_set_drvdata(&cgdev->dev, priv);
20cdffa4 1333 cgdev->dev.type = &ctcm_devtype;
293d984f
PT		 1334
1335 return 0;
1336}
1337
1338/**
1339 * Add a new channel to the list of channels.
1340 * Keeps the channel list sorted.
1341 *
1342 * cdev The ccw_device to be added.
1343 * type The type class of the new channel.
1344 * priv Points to the private data of the ccwgroup_device.
1345 *
1346 * returns 0 on success, !0 on error.
1347 */
0ca8cc6f 1348static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
293d984f
PT		 1349 struct ctcm_priv *priv)
1350{
1351 struct channel **c = &channels;
1352 struct channel *ch;
1353 int ccw_num;
1354 int rc = 0;
1355
aa3f2cb6
PT		 1356 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1357 "%s(%s), type %d, proto %d",
2a0217d5 1358 __func__, dev_name(&cdev->dev), type, priv->protocol);
aa3f2cb6 1359
293d984f
PT		 1360 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1361 if (ch == NULL)
aa3f2cb6 1362 return -ENOMEM;
293d984f
PT		 1363
1364 ch->protocol = priv->protocol;
1365 if (IS_MPC(priv)) {
ae57b20a 1366 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
293d984f
PT		 1367 if (ch->discontact_th == NULL)
1368 goto nomem_return;
1369
1370 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1371 tasklet_init(&ch->ch_disc_tasklet,
1372 mpc_action_send_discontact, (unsigned long)ch);
1373
1374 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1375 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1376 ccw_num = 17;
1377 } else
1378 ccw_num = 8;
1379
ae57b20a 1380 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
293d984f
PT		 1381 if (ch->ccw == NULL)
1382 goto nomem_return;
1383
1384 ch->cdev = cdev;
2a0217d5 1385 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
293d984f
PT		 1386 ch->type = type;
1387
1388 /**
1389 * "static" ccws are used in the following way:
1390 *
1391 * ccw[0..2] (Channel program for generic I/O):
1392 * 0: prepare
1393 * 1: read or write (depending on direction) with fixed
1394 * buffer (idal allocated once when buffer is allocated)
1395 * 2: nop
1396 * ccw[3..5] (Channel program for direct write of packets)
1397 * 3: prepare
1398 * 4: write (idal allocated on every write).
1399 * 5: nop
1400 * ccw[6..7] (Channel program for initial channel setup):
1401 * 6: set extended mode
1402 * 7: nop
1403 *
1404 * ch->ccw[0..5] are initialized in ch_action_start because
1405 * the channel's direction is yet unknown here.
1406 *
1407 * ccws used for xid2 negotiations
1408 * ch-ccw[8-14] need to be used for the XID exchange either
1409 * X side XID2 Processing
1410 * 8: write control
1411 * 9: write th
1412 * 10: write XID
1413 * 11: read th from secondary
1414 * 12: read XID from secondary
1415 * 13: read 4 byte ID
1416 * 14: nop
1417 * Y side XID Processing
1418 * 8: sense
1419 * 9: read th
1420 * 10: read XID
1421 * 11: write th
1422 * 12: write XID
1423 * 13: write 4 byte ID
1424 * 14: nop
1425 *
1426 * ccws used for double noop due to VM timing issues
1427 * which result in unrecoverable Busy on channel
1428 * 15: nop
1429 * 16: nop
1430 */
1431 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1432 ch->ccw[6].flags = CCW_FLAG_SLI;
1433
1434 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1435 ch->ccw[7].flags = CCW_FLAG_SLI;
1436
1437 if (IS_MPC(priv)) {
1438 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1439 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1440 ch->ccw[15].count = TH_HEADER_LENGTH;
1441 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1442
1443 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1444 ch->ccw[16].flags = CCW_FLAG_SLI;
1445
1446 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1447 ctc_ch_event_names, CTC_MPC_NR_STATES,
1448 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1449 mpc_ch_fsm_len, GFP_KERNEL);
1450 } else {
1451 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1452 ctc_ch_event_names, CTC_NR_STATES,
1453 CTC_NR_EVENTS, ch_fsm,
1454 ch_fsm_len, GFP_KERNEL);
1455 }
1456 if (ch->fsm == NULL)
1457 goto free_return;
1458
1459 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1460
1461 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1462 if (ch->irb == NULL)
1463 goto nomem_return;
1464
1465 while (*c && ctcm_less_than((*c)->id, ch->id))
1466 c = &(*c)->next;
1467
1468 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1469 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1470 "%s (%s) already in list, using old entry",
aa3f2cb6 1471 __func__, (*c)->id);
293d984f
PT		 1472
1473 goto free_return;
1474 }
1475
1476 spin_lock_init(&ch->collect_lock);
1477
1478 fsm_settimer(ch->fsm, &ch->timer);
1479 skb_queue_head_init(&ch->io_queue);
1480 skb_queue_head_init(&ch->collect_queue);
1481
1482 if (IS_MPC(priv)) {
1483 fsm_settimer(ch->fsm, &ch->sweep_timer);
1484 skb_queue_head_init(&ch->sweep_queue);
1485 }
1486 ch->next = *c;
1487 *c = ch;
1488 return 0;
1489
1490nomem_return:
293d984f
PT		 1491 rc = -ENOMEM;
1492
1493free_return: /* note that all channel pointers are 0 or valid */
aa3f2cb6 1494 kfree(ch->ccw);
293d984f
PT		 1495 kfree(ch->discontact_th);
1496 kfree_fsm(ch->fsm);
1497 kfree(ch->irb);
1498 kfree(ch);
1499 return rc;
1500}
1501
1502/*
1503 * Return type of a detected device.
1504 */
0ca8cc6f 1505static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
293d984f 1506{
0ca8cc6f
UB		 1507 enum ctcm_channel_types type;
1508 type = (enum ctcm_channel_types)id->driver_info;
293d984f 1509
0ca8cc6f
UB		 1510 if (type == ctcm_channel_type_ficon)
1511 type = ctcm_channel_type_escon;
293d984f
PT		 1512
1513 return type;
1514}
1515
1516/**
1517 *
1518 * Setup an interface.
1519 *
1520 * cgdev Device to be setup.
1521 *
1522 * returns 0 on success, !0 on failure.
1523 */
1524static int ctcm_new_device(struct ccwgroup_device *cgdev)
1525{
1526 char read_id[CTCM_ID_SIZE];
1527 char write_id[CTCM_ID_SIZE];
1528 int direction;
0ca8cc6f 1529 enum ctcm_channel_types type;
293d984f
PT		 1530 struct ctcm_priv *priv;
1531 struct net_device *dev;
aa3f2cb6
PT		 1532 struct ccw_device *cdev0;
1533 struct ccw_device *cdev1;
a1c1f5ea
EL		 1534 struct channel *readc;
1535 struct channel *writec;
293d984f 1536 int ret;
a1c1f5ea 1537 int result;
293d984f 1538
293d984f 1539 priv = dev_get_drvdata(&cgdev->dev);
a1c1f5ea
EL		 1540 if (!priv) {
1541 result = -ENODEV;
1542 goto out_err_result;
1543 }
293d984f 1544
aa3f2cb6
PT		 1545 cdev0 = cgdev->cdev[0];
1546 cdev1 = cgdev->cdev[1];
1547
1548 type = get_channel_type(&cdev0->id);
293d984f 1549
b9d3aed7
CH		 1550 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1551 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
293d984f 1552
aa3f2cb6 1553 ret = add_channel(cdev0, type, priv);
a1c1f5ea
EL		 1554 if (ret) {
1555 result = ret;
1556 goto out_err_result;
1557 }
aa3f2cb6 1558 ret = add_channel(cdev1, type, priv);
a1c1f5ea
EL		 1559 if (ret) {
1560 result = ret;
1561 goto out_remove_channel1;
1562 }
293d984f 1563
aa3f2cb6 1564 ret = ccw_device_set_online(cdev0);
293d984f 1565 if (ret != 0) {
aa3f2cb6
PT		 1566 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1567 "%s(%s) set_online rc=%d",
1568 CTCM_FUNTAIL, read_id, ret);
a1c1f5ea
EL		 1569 result = -EIO;
1570 goto out_remove_channel2;
293d984f
PT		 1571 }
1572
aa3f2cb6 1573 ret = ccw_device_set_online(cdev1);
293d984f 1574 if (ret != 0) {
aa3f2cb6
PT		 1575 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1576 "%s(%s) set_online rc=%d",
1577 CTCM_FUNTAIL, write_id, ret);
a1c1f5ea
EL		 1578
1579 result = -EIO;
1580 goto out_ccw1;
293d984f
PT		 1581 }
1582
1583 dev = ctcm_init_netdevice(priv);
a1c1f5ea
EL		 1584 if (dev == NULL) {
1585 result = -ENODEV;
1586 goto out_ccw2;
1587 }
293d984f 1588
3c09e264 1589 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
293d984f 1590 priv->channel[direction] =
3c09e264
UB		 1591 channel_get(type, direction == CTCM_READ ?
1592 read_id : write_id, direction);
293d984f 1593 if (priv->channel[direction] == NULL) {
3c09e264
UB		 1594 if (direction == CTCM_WRITE)
1595 channel_free(priv->channel[CTCM_READ]);
aa3f2cb6 1596 goto out_dev;
293d984f
PT		 1597 }
1598 priv->channel[direction]->netdev = dev;
1599 priv->channel[direction]->protocol = priv->protocol;
1600 priv->channel[direction]->max_bufsize = priv->buffer_size;
1601 }
1602 /* sysfs magic */
1603 SET_NETDEV_DEV(dev, &cgdev->dev);
1604
a1c1f5ea
EL		 1605 if (register_netdev(dev)) {
1606 result = -ENODEV;
1607 goto out_dev;
1608 }
293d984f 1609
293d984f
PT		 1610 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1611
2a7c6f2c
PT		 1612 dev_info(&dev->dev,
1613 "setup OK : r/w = %s/%s, protocol : %d\n",
3c09e264
UB		 1614 priv->channel[CTCM_READ]->id,
1615 priv->channel[CTCM_WRITE]->id, priv->protocol);
2a7c6f2c 1616
293d984f 1617 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
aa3f2cb6 1618 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
3c09e264
UB		 1619 priv->channel[CTCM_READ]->id,
1620 priv->channel[CTCM_WRITE]->id, priv->protocol);
293d984f
PT		 1621
1622 return 0;
aa3f2cb6
PT		 1623out_dev:
1624 ctcm_free_netdevice(dev);
a1c1f5ea 1625out_ccw2:
293d984f 1626 ccw_device_set_offline(cgdev->cdev[1]);
a1c1f5ea 1627out_ccw1:
293d984f 1628 ccw_device_set_offline(cgdev->cdev[0]);
a1c1f5ea 1629out_remove_channel2:
3c09e264 1630 readc = channel_get(type, read_id, CTCM_READ);
a1c1f5ea
EL		 1631 channel_remove(readc);
1632out_remove_channel1:
3c09e264 1633 writec = channel_get(type, write_id, CTCM_WRITE);
a1c1f5ea
EL		 1634 channel_remove(writec);
1635out_err_result:
1636 return result;
293d984f
PT		 1637}
1638
1639/**
1640 * Shutdown an interface.
1641 *
1642 * cgdev Device to be shut down.
1643 *
1644 * returns 0 on success, !0 on failure.
1645 */
1646static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1647{
1648 struct ctcm_priv *priv;
1649 struct net_device *dev;
1650
1651 priv = dev_get_drvdata(&cgdev->dev);
1652 if (!priv)
1653 return -ENODEV;
1654
3c09e264
UB		 1655 if (priv->channel[CTCM_READ]) {
1656 dev = priv->channel[CTCM_READ]->netdev;
293d984f
PT		 1657 CTCM_DBF_DEV(SETUP, dev, "");
1658 /* Close the device */
1659 ctcm_close(dev);
1660 dev->flags &= ~IFF_RUNNING;
3c09e264 1661 channel_free(priv->channel[CTCM_READ]);
293d984f
PT		 1662 } else
1663 dev = NULL;
1664
3c09e264
UB		 1665 if (priv->channel[CTCM_WRITE])
1666 channel_free(priv->channel[CTCM_WRITE]);
293d984f
PT		 1667
1668 if (dev) {
aa3f2cb6 1669 unregister_netdev(dev);
293d984f
PT		 1670 ctcm_free_netdevice(dev);
1671 }
1672
1673 if (priv->fsm)
1674 kfree_fsm(priv->fsm);
1675
1676 ccw_device_set_offline(cgdev->cdev[1]);
1677 ccw_device_set_offline(cgdev->cdev[0]);
1678
3c09e264
UB		 1679 if (priv->channel[CTCM_READ])
1680 channel_remove(priv->channel[CTCM_READ]);
1681 if (priv->channel[CTCM_WRITE])
1682 channel_remove(priv->channel[CTCM_WRITE]);
1683 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
293d984f
PT		 1684
1685 return 0;
1686
1687}
1688
1689
1690static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1691{
aa3f2cb6 1692 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
293d984f 1693
aa3f2cb6
PT		 1694 BUG_ON(priv == NULL);
1695
1696 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
8ac6d452
UB		 1697 "removing device %p, proto : %d",
1698 cgdev, priv->protocol);
293d984f 1699
293d984f
PT		 1700 if (cgdev->state == CCWGROUP_ONLINE)
1701 ctcm_shutdown_device(cgdev);
293d984f
PT		 1702 dev_set_drvdata(&cgdev->dev, NULL);
1703 kfree(priv);
1704 put_device(&cgdev->dev);
1705}
1706
b8a2d42a
FB		 1707static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1708{
1709 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1710
1711 if (gdev->state == CCWGROUP_OFFLINE)
1712 return 0;
3c09e264
UB		 1713 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1714 ctcm_close(priv->channel[CTCM_READ]->netdev);
1e1815be
FB		 1715 if (!wait_event_timeout(priv->fsm->wait_q,
1716 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
3c09e264 1717 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1e1815be
FB		 1718 return -EBUSY;
1719 }
b8a2d42a
FB		 1720 ccw_device_set_offline(gdev->cdev[1]);
1721 ccw_device_set_offline(gdev->cdev[0]);
1722 return 0;
1723}
1724
1725static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1726{
1727 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1728 int rc;
1729
1730 if (gdev->state == CCWGROUP_OFFLINE)
1731 return 0;
1732 rc = ccw_device_set_online(gdev->cdev[1]);
1733 if (rc)
1734 goto err_out;
1735 rc = ccw_device_set_online(gdev->cdev[0]);
1736 if (rc)
1737 goto err_out;
3c09e264 1738 ctcm_open(priv->channel[CTCM_READ]->netdev);
b8a2d42a 1739err_out:
3c09e264 1740 netif_device_attach(priv->channel[CTCM_READ]->netdev);
b8a2d42a
FB		 1741 return rc;
1742}
1743
0ca8cc6f
UB		 1744static struct ccw_device_id ctcm_ids[] = {
1745 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1746 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1747 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1748 {},
1749};
1750MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1751
1752static struct ccw_driver ctcm_ccw_driver = {
3bda058b
SO		 1753 .driver = {
1754 .owner = THIS_MODULE,
1755 .name = "ctcm",
1756 },
0ca8cc6f
UB		 1757 .ids = ctcm_ids,
1758 .probe = ccwgroup_probe_ccwdev,
1759 .remove = ccwgroup_remove_ccwdev,
de400d6b 1760 .int_class = IOINT_CTC,
0ca8cc6f
UB		 1761};
1762
293d984f 1763static struct ccwgroup_driver ctcm_group_driver = {
3c190c51
SO		 1764 .driver = {
1765 .owner = THIS_MODULE,
1766 .name = CTC_DRIVER_NAME,
1767 },
20cdffa4 1768 .setup = ctcm_probe_device,
293d984f
PT		 1769 .remove = ctcm_remove_device,
1770 .set_online = ctcm_new_device,
1771 .set_offline = ctcm_shutdown_device,
b8a2d42a
FB		 1772 .freeze = ctcm_pm_suspend,
1773 .thaw = ctcm_pm_resume,
1774 .restore = ctcm_pm_resume,
293d984f
PT		 1775};
1776
20cdffa4
SO		 1777static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1778 const char *buf, size_t count)
0ca8cc6f
UB		 1779{
1780 int err;
1781
9814fdfb 1782 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
0ca8cc6f
UB		 1783 return err ? err : count;
1784}
0ca8cc6f
UB		 1785static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1786
330ce1b0 1787static struct attribute *ctcm_drv_attrs[] = {
0ca8cc6f
UB		 1788 &driver_attr_group.attr,
1789 NULL,
1790};
330ce1b0
SO		 1791static struct attribute_group ctcm_drv_attr_group = {
1792 .attrs = ctcm_drv_attrs,
0ca8cc6f 1793};
330ce1b0
SO		 1794static const struct attribute_group *ctcm_drv_attr_groups[] = {
1795 &ctcm_drv_attr_group,
0ca8cc6f
UB		 1796 NULL,
1797};
293d984f
PT		 1798
1799/*
1800 * Module related routines
1801 */
1802
1803/*
1804 * Prepare to be unloaded. Free IRQ's and release all resources.
1805 * This is called just before this module is unloaded. It is
1806 * not called, if the usage count is !0, so we don't need to check
1807 * for that.
1808 */
1809static void __exit ctcm_exit(void)
1810{
0ca8cc6f
UB		 1811 ccwgroup_driver_unregister(&ctcm_group_driver);
1812 ccw_driver_unregister(&ctcm_ccw_driver);
1813 root_device_unregister(ctcm_root_dev);
293d984f 1814 ctcm_unregister_dbf_views();
2a7c6f2c 1815 pr_info("CTCM driver unloaded\n");
293d984f
PT		 1816}
1817
1818/*
1819 * Print Banner.
1820 */
1821static void print_banner(void)
1822{
2a7c6f2c 1823 pr_info("CTCM driver initialized\n");
293d984f
PT		 1824}
1825
1826/**
1827 * Initialize module.
1828 * This is called just after the module is loaded.
1829 *
1830 * returns 0 on success, !0 on error.
1831 */
1832static int __init ctcm_init(void)
1833{
1834 int ret;
1835
1836 channels = NULL;
1837
1838 ret = ctcm_register_dbf_views();
0ca8cc6f
UB		 1839 if (ret)
1840 goto out_err;
1841 ctcm_root_dev = root_device_register("ctcm");
1842 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1843 if (ret)
1844 goto register_err;
1845 ret = ccw_driver_register(&ctcm_ccw_driver);
1846 if (ret)
1847 goto ccw_err;
330ce1b0 1848 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
0ca8cc6f
UB		 1849 ret = ccwgroup_driver_register(&ctcm_group_driver);
1850 if (ret)
1851 goto ccwgroup_err;
293d984f 1852 print_banner();
0ca8cc6f
UB		 1853 return 0;
1854
1855ccwgroup_err:
1856 ccw_driver_unregister(&ctcm_ccw_driver);
1857ccw_err:
1858 root_device_unregister(ctcm_root_dev);
1859register_err:
1860 ctcm_unregister_dbf_views();
1861out_err:
1862 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1863 __func__, ret);
293d984f
PT		 1864 return ret;
1865}
1866
1867module_init(ctcm_init);
1868module_exit(ctcm_exit);
1869
1870MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1871MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1872MODULE_LICENSE("GPL");
1873
Linux kernel - Deliverables
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