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s390/ctcm: improve endianness handling
[linux-2.6/btrfs-unstable.git] / drivers / s390 / net / ctcm_main.c
blob198842ce6876e812b07d57ab826ca8934920bd44
1 /*
2 * Copyright IBM Corp. 2001, 2009
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
22 #define KMSG_COMPONENT "ctcm"
23 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
24
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
52 #include "ctcm_fsms.h"
53 #include "ctcm_main.h"
54
55 /* Some common global variables */
56
57 /**
58 * The root device for ctcm group devices
59 */
60 static struct device *ctcm_root_dev;
61
62 /*
63 * Linked list of all detected channels.
64 */
65 struct 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 */
74 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
75 {
76 struct net_device *dev = ch->netdev;
77 struct ctcm_priv *priv = dev->ml_priv;
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)) {
92 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
93 ch->logflags |= LOG_FLAG_ILLEGALPKT;
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 */
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);
104 }
105 priv->stats.rx_dropped++;
106 priv->stats.rx_frame_errors++;
107 return;
108 }
109 pskb->protocol = cpu_to_be16(header->type);
110 if ((header->length <= LL_HEADER_LENGTH) ||
111 (len <= LL_HEADER_LENGTH)) {
112 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
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);
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)) {
130 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
131 "%s(%s): Packet size %d (overrun)"
132 " - dropping", CTCM_FUNTAIL,
133 dev->name, header->length);
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)) {
147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
148 "%s(%s): MEMORY allocation error",
149 CTCM_FUNTAIL, dev->name);
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);
169 if (len > 0) {
170 skb_pull(pskb, header->length);
171 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
172 CTCM_DBF_DEV_NAME(TRACE, dev,
173 "Overrun in ctcm_unpack_skb");
174 ch->logflags |= LOG_FLAG_OVERRUN;
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 */
187 static void channel_free(struct channel *ch)
188 {
189 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
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 */
199 static 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 */
251 static struct channel *channel_get(enum ctcm_channel_types type,
252 char *id, int direction)
253 {
254 struct channel *ch = channels;
255
256 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
257 ch = ch->next;
258 if (!ch) {
259 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
260 "%s(%d, %s, %d) not found in channel list\n",
261 CTCM_FUNTAIL, type, id, direction);
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;
268 ch->flags |= (direction == CTCM_WRITE)
269 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
270 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
271 }
272 }
273 return ch;
274 }
275
276 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
277 {
278 if (!IS_ERR(irb))
279 return 0;
280
281 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
282 "irb error %ld on device %s\n",
283 PTR_ERR(irb), dev_name(&cdev->dev));
284
285 switch (PTR_ERR(irb)) {
286 case -EIO:
287 dev_err(&cdev->dev,
288 "An I/O-error occurred on the CTCM device\n");
289 break;
290 case -ETIMEDOUT:
291 dev_err(&cdev->dev,
292 "An adapter hardware operation timed out\n");
293 break;
294 default:
295 dev_err(&cdev->dev,
296 "An error occurred on the adapter hardware\n");
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 */
308 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
309 {
310 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
311 "%s(%s): %02x",
312 CTCM_FUNTAIL, ch->id, sense);
313
314 if (sense & SNS0_INTERVENTION_REQ) {
315 if (sense & 0x01) {
316 if (ch->sense_rc != 0x01) {
317 pr_notice(
318 "%s: The communication peer has "
319 "disconnected\n", ch->id);
320 ch->sense_rc = 0x01;
321 }
322 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
323 } else {
324 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
325 pr_notice(
326 "%s: The remote operating system is "
327 "not available\n", ch->id);
328 ch->sense_rc = SNS0_INTERVENTION_REQ;
329 }
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) {
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 }
340 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
341 } else {
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 }
348 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
349 }
350 } else if (sense & SNS0_BUS_OUT_CHECK) {
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 */
358 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
359 else /* Data-transfer parity error */
360 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
361 } else if (sense & SNS0_CMD_REJECT) {
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 }
368 } else if (sense == 0) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
370 "%s(%s): Unit check ZERO",
371 CTCM_FUNTAIL, ch->id);
372 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
373 } else {
374 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
375 "%s(%s): Unit check code %02x unknown",
376 CTCM_FUNTAIL, ch->id, sense);
377 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
378 }
379 }
380
381 int ctcm_ch_alloc_buffer(struct channel *ch)
382 {
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) {
386 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
387 "%s(%s): %s trans_skb allocation error",
388 CTCM_FUNTAIL, ch->id,
389 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
390 "RX" : "TX");
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;
398 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
399 "%s(%s): %s set norm_cda failed",
400 CTCM_FUNTAIL, ch->id,
401 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
402 "RX" : "TX");
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 */
424 int ctcm_open(struct net_device *dev)
425 {
426 struct ctcm_priv *priv = dev->ml_priv;
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 */
442 int ctcm_close(struct net_device *dev)
443 {
444 struct ctcm_priv *priv = dev->ml_priv;
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 */
464 static 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 = be16_to_cpu(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 = be16_to_cpu(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);
548 return -ENOMEM;
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 }
563 if (do_debug_ccw)
564 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
565 sizeof(struct ccw1) * 3);
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 = jiffies;
571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572 (unsigned long)ch, 0xff, 0);
573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574 if (ccw_idx == 3)
575 ch->prof.doios_single++;
576 if (rc != 0) {
577 fsm_deltimer(&ch->timer);
578 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579 if (ccw_idx == 3)
580 skb_dequeue_tail(&ch->io_queue);
581 /*
582 * Remove our header. It gets added
583 * again on retransmit.
584 */
585 skb_pull(skb, LL_HEADER_LENGTH + 2);
586 } else if (ccw_idx == 0) {
587 struct net_device *dev = ch->netdev;
588 struct ctcm_priv *priv = dev->ml_priv;
589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
592 done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595 }
596
597 static void ctcmpc_send_sweep_req(struct channel *rch)
598 {
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
605 /* int rc = 0; */
606
607 priv = dev->ml_priv;
608 grp = priv->mpcg;
609 ch = priv->channel[CTCM_WRITE];
610
611 /* sweep processing is not complete until response and request */
612 /* has completed for all read channels in group */
613 if (grp->in_sweep == 0) {
614 grp->in_sweep = 1;
615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
622 /* rc = -ENOMEM; */
623 goto nomem;
624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 netif_trans_update(dev);
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
652 nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657 return;
658 }
659
660 /*
661 * MPC mode version of transmit_skb
662 */
663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664 {
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
667 struct ctcm_priv *priv = dev->ml_priv;
668 struct mpc_group *grp = priv->mpcg;
669 struct th_header *header;
670 struct sk_buff *nskb;
671 int rc = 0;
672 int ccw_idx;
673 unsigned long hi;
674 unsigned long saveflags = 0; /* avoids compiler warning */
675
676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 atomic_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
687 goto nomem_exit;
688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 atomic_inc(&skb->users);
720
721 /*
722 * IDAL support in CTCM is broken, so we have to
723 * care about skb's above 2G ourselves.
724 */
725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726 if (hi) {
727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728 if (!nskb) {
729 goto nomem_exit;
730 } else {
731 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
732 atomic_inc(&nskb->users);
733 atomic_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741 if (!p_header)
742 goto nomem_exit;
743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772 if (!header)
773 goto nomem_exit;
774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
803 * Remove our header.
804 * It gets added again on retransmit.
805 */
806 goto nomem_exit;
807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
813 atomic_dec(&skb->users);
814 dev_kfree_skb_irq(skb);
815 ccw_idx = 0;
816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817 "up to 32 bytes sent to vtam:\n",
818 __func__, dev->name, ch->trans_skb->len);
819 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820 min_t(int, 32, ch->trans_skb->len));
821 } else {
822 skb_queue_tail(&ch->io_queue, skb);
823 ccw_idx = 3;
824 }
825 ch->retry = 0;
826 fsm_newstate(ch->fsm, CTC_STATE_TX);
827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829 if (do_debug_ccw)
830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831 sizeof(struct ccw1) * 3);
832
833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834 ch->prof.send_stamp = jiffies;
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
850 ctcmpc_send_sweep_req(ch);
851
852 goto done;
853 nomem_exit:
854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855 "%s(%s): MEMORY allocation ERROR\n",
856 CTCM_FUNTAIL, ch->id);
857 rc = -ENOMEM;
858 atomic_dec(&skb->users);
859 dev_kfree_skb_any(skb);
860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
861 done:
862 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
863 return rc;
864 }
865
866 /**
867 * Start transmission of a packet.
868 * Called from generic network device layer.
869 *
870 * skb Pointer to buffer containing the packet.
871 * dev Pointer to interface struct.
872 *
873 * returns 0 if packet consumed, !0 if packet rejected.
874 * Note: If we return !0, then the packet is free'd by
875 * the generic network layer.
876 */
877 /* first merge version - leaving both functions separated */
878 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
879 {
880 struct ctcm_priv *priv = dev->ml_priv;
881
882 if (skb == NULL) {
883 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
884 "%s(%s): NULL sk_buff passed",
885 CTCM_FUNTAIL, dev->name);
886 priv->stats.tx_dropped++;
887 return NETDEV_TX_OK;
888 }
889 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891 "%s(%s): Got sk_buff with head room < %ld bytes",
892 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
893 dev_kfree_skb(skb);
894 priv->stats.tx_dropped++;
895 return NETDEV_TX_OK;
896 }
897
898 /*
899 * If channels are not running, try to restart them
900 * and throw away packet.
901 */
902 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
903 fsm_event(priv->fsm, DEV_EVENT_START, dev);
904 dev_kfree_skb(skb);
905 priv->stats.tx_dropped++;
906 priv->stats.tx_errors++;
907 priv->stats.tx_carrier_errors++;
908 return NETDEV_TX_OK;
909 }
910
911 if (ctcm_test_and_set_busy(dev))
912 return NETDEV_TX_BUSY;
913
914 netif_trans_update(dev);
915 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
916 return NETDEV_TX_BUSY;
917 return NETDEV_TX_OK;
918 }
919
920 /* unmerged MPC variant of ctcm_tx */
921 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
922 {
923 int len = 0;
924 struct ctcm_priv *priv = dev->ml_priv;
925 struct mpc_group *grp = priv->mpcg;
926 struct sk_buff *newskb = NULL;
927
928 /*
929 * Some sanity checks ...
930 */
931 if (skb == NULL) {
932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933 "%s(%s): NULL sk_buff passed",
934 CTCM_FUNTAIL, dev->name);
935 priv->stats.tx_dropped++;
936 goto done;
937 }
938 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
939 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
940 "%s(%s): Got sk_buff with head room < %ld bytes",
941 CTCM_FUNTAIL, dev->name,
942 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
943
944 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
945
946 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
947 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
948
949 if (!newskb) {
950 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
951 "%s: %s: __dev_alloc_skb failed",
952 __func__, dev->name);
953
954 dev_kfree_skb_any(skb);
955 priv->stats.tx_dropped++;
956 priv->stats.tx_errors++;
957 priv->stats.tx_carrier_errors++;
958 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
959 goto done;
960 }
961 newskb->protocol = skb->protocol;
962 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
963 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
964 dev_kfree_skb_any(skb);
965 skb = newskb;
966 }
967
968 /*
969 * If channels are not running,
970 * notify anybody about a link failure and throw
971 * away packet.
972 */
973 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
974 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
975 dev_kfree_skb_any(skb);
976 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
977 "%s(%s): inactive MPCGROUP - dropped",
978 CTCM_FUNTAIL, dev->name);
979 priv->stats.tx_dropped++;
980 priv->stats.tx_errors++;
981 priv->stats.tx_carrier_errors++;
982 goto done;
983 }
984
985 if (ctcm_test_and_set_busy(dev)) {
986 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
987 "%s(%s): device busy - dropped",
988 CTCM_FUNTAIL, dev->name);
989 dev_kfree_skb_any(skb);
990 priv->stats.tx_dropped++;
991 priv->stats.tx_errors++;
992 priv->stats.tx_carrier_errors++;
993 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
994 goto done;
995 }
996
997 netif_trans_update(dev);
998 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
999 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000 "%s(%s): device error - dropped",
1001 CTCM_FUNTAIL, dev->name);
1002 dev_kfree_skb_any(skb);
1003 priv->stats.tx_dropped++;
1004 priv->stats.tx_errors++;
1005 priv->stats.tx_carrier_errors++;
1006 ctcm_clear_busy(dev);
1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008 goto done;
1009 }
1010 ctcm_clear_busy(dev);
1011 done:
1012 if (do_debug)
1013 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
1015 return NETDEV_TX_OK; /* handle freeing of skb here */
1016 }
1017
1018
1019 /**
1020 * Sets MTU of an interface.
1021 *
1022 * dev Pointer to interface struct.
1023 * new_mtu The new MTU to use for this interface.
1024 *
1025 * returns 0 on success, -EINVAL if MTU is out of valid range.
1026 * (valid range is 576 .. 65527). If VM is on the
1027 * remote side, maximum MTU is 32760, however this is
1028 * not checked here.
1029 */
1030 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031 {
1032 struct ctcm_priv *priv;
1033 int max_bufsize;
1034
1035 priv = dev->ml_priv;
1036 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1037
1038 if (IS_MPC(priv)) {
1039 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1040 return -EINVAL;
1041 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1042 } else {
1043 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1044 return -EINVAL;
1045 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1046 }
1047 dev->mtu = new_mtu;
1048 return 0;
1049 }
1050
1051 /**
1052 * Returns interface statistics of a device.
1053 *
1054 * dev Pointer to interface struct.
1055 *
1056 * returns Pointer to stats struct of this interface.
1057 */
1058 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1059 {
1060 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1061 }
1062
1063 static void ctcm_free_netdevice(struct net_device *dev)
1064 {
1065 struct ctcm_priv *priv;
1066 struct mpc_group *grp;
1067
1068 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1069 "%s(%s)", CTCM_FUNTAIL, dev->name);
1070 priv = dev->ml_priv;
1071 if (priv) {
1072 grp = priv->mpcg;
1073 if (grp) {
1074 if (grp->fsm)
1075 kfree_fsm(grp->fsm);
1076 if (grp->xid_skb)
1077 dev_kfree_skb(grp->xid_skb);
1078 if (grp->rcvd_xid_skb)
1079 dev_kfree_skb(grp->rcvd_xid_skb);
1080 tasklet_kill(&grp->mpc_tasklet2);
1081 kfree(grp);
1082 priv->mpcg = NULL;
1083 }
1084 if (priv->fsm) {
1085 kfree_fsm(priv->fsm);
1086 priv->fsm = NULL;
1087 }
1088 kfree(priv->xid);
1089 priv->xid = NULL;
1090 /*
1091 * Note: kfree(priv); is done in "opposite" function of
1092 * allocator function probe_device which is remove_device.
1093 */
1094 }
1095 #ifdef MODULE
1096 free_netdev(dev);
1097 #endif
1098 }
1099
1100 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1101
1102 static const struct net_device_ops ctcm_netdev_ops = {
1103 .ndo_open = ctcm_open,
1104 .ndo_stop = ctcm_close,
1105 .ndo_get_stats = ctcm_stats,
1106 .ndo_change_mtu = ctcm_change_mtu,
1107 .ndo_start_xmit = ctcm_tx,
1108 };
1109
1110 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1111 .ndo_open = ctcm_open,
1112 .ndo_stop = ctcm_close,
1113 .ndo_get_stats = ctcm_stats,
1114 .ndo_change_mtu = ctcm_change_mtu,
1115 .ndo_start_xmit = ctcmpc_tx,
1116 };
1117
1118 void static ctcm_dev_setup(struct net_device *dev)
1119 {
1120 dev->type = ARPHRD_SLIP;
1121 dev->tx_queue_len = 100;
1122 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1123 dev->min_mtu = 576;
1124 dev->max_mtu = 65527;
1125 }
1126
1127 /*
1128 * Initialize everything of the net device except the name and the
1129 * channel structs.
1130 */
1131 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1132 {
1133 struct net_device *dev;
1134 struct mpc_group *grp;
1135 if (!priv)
1136 return NULL;
1137
1138 if (IS_MPC(priv))
1139 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1140 ctcm_dev_setup);
1141 else
1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1143 ctcm_dev_setup);
1144
1145 if (!dev) {
1146 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1147 "%s: MEMORY allocation ERROR",
1148 CTCM_FUNTAIL);
1149 return NULL;
1150 }
1151 dev->ml_priv = priv;
1152 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1153 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1154 dev_fsm, dev_fsm_len, GFP_KERNEL);
1155 if (priv->fsm == NULL) {
1156 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1157 free_netdev(dev);
1158 return NULL;
1159 }
1160 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1161 fsm_settimer(priv->fsm, &priv->restart_timer);
1162
1163 if (IS_MPC(priv)) {
1164 /* MPC Group Initializations */
1165 grp = ctcmpc_init_mpc_group(priv);
1166 if (grp == NULL) {
1167 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1168 free_netdev(dev);
1169 return NULL;
1170 }
1171 tasklet_init(&grp->mpc_tasklet2,
1172 mpc_group_ready, (unsigned long)dev);
1173 dev->mtu = MPC_BUFSIZE_DEFAULT -
1174 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1175
1176 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1177 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1178 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1179 } else {
1180 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1181 dev->netdev_ops = &ctcm_netdev_ops;
1182 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1183 }
1184
1185 CTCMY_DBF_DEV(SETUP, dev, "finished");
1186
1187 return dev;
1188 }
1189
1190 /**
1191 * Main IRQ handler.
1192 *
1193 * cdev The ccw_device the interrupt is for.
1194 * intparm interruption parameter.
1195 * irb interruption response block.
1196 */
1197 static void ctcm_irq_handler(struct ccw_device *cdev,
1198 unsigned long intparm, struct irb *irb)
1199 {
1200 struct channel *ch;
1201 struct net_device *dev;
1202 struct ctcm_priv *priv;
1203 struct ccwgroup_device *cgdev;
1204 int cstat;
1205 int dstat;
1206
1207 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1208 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1209
1210 if (ctcm_check_irb_error(cdev, irb))
1211 return;
1212
1213 cgdev = dev_get_drvdata(&cdev->dev);
1214
1215 cstat = irb->scsw.cmd.cstat;
1216 dstat = irb->scsw.cmd.dstat;
1217
1218 /* Check for unsolicited interrupts. */
1219 if (cgdev == NULL) {
1220 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1221 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1222 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1223 dev_warn(&cdev->dev,
1224 "The adapter received a non-specific IRQ\n");
1225 return;
1226 }
1227
1228 priv = dev_get_drvdata(&cgdev->dev);
1229
1230 /* Try to extract channel from driver data. */
1231 if (priv->channel[CTCM_READ]->cdev == cdev)
1232 ch = priv->channel[CTCM_READ];
1233 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1234 ch = priv->channel[CTCM_WRITE];
1235 else {
1236 dev_err(&cdev->dev,
1237 "%s: Internal error: Can't determine channel for "
1238 "interrupt device %s\n",
1239 __func__, dev_name(&cdev->dev));
1240 /* Explain: inconsistent internal structures */
1241 return;
1242 }
1243
1244 dev = ch->netdev;
1245 if (dev == NULL) {
1246 dev_err(&cdev->dev,
1247 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1248 __func__, ch);
1249 /* Explain: inconsistent internal structures */
1250 return;
1251 }
1252
1253 /* Copy interruption response block. */
1254 memcpy(ch->irb, irb, sizeof(struct irb));
1255
1256 /* Issue error message and return on subchannel error code */
1257 if (irb->scsw.cmd.cstat) {
1258 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1259 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1260 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1261 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1262 dev_warn(&cdev->dev,
1263 "A check occurred on the subchannel\n");
1264 return;
1265 }
1266
1267 /* Check the reason-code of a unit check */
1268 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1269 if ((irb->ecw[0] & ch->sense_rc) == 0)
1270 /* print it only once */
1271 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1272 "%s(%s): sense=%02x, ds=%02x",
1273 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1274 ccw_unit_check(ch, irb->ecw[0]);
1275 return;
1276 }
1277 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1278 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1279 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1280 else
1281 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1282 return;
1283 }
1284 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1285 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1286 return;
1287 }
1288 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1289 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1290 (irb->scsw.cmd.stctl ==
1291 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1292 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1293 else
1294 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1295
1296 }
1297
1298 static const struct device_type ctcm_devtype = {
1299 .name = "ctcm",
1300 .groups = ctcm_attr_groups,
1301 };
1302
1303 /**
1304 * Add ctcm specific attributes.
1305 * Add ctcm private data.
1306 *
1307 * cgdev pointer to ccwgroup_device just added
1308 *
1309 * returns 0 on success, !0 on failure.
1310 */
1311 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1312 {
1313 struct ctcm_priv *priv;
1314
1315 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1316 "%s %p",
1317 __func__, cgdev);
1318
1319 if (!get_device(&cgdev->dev))
1320 return -ENODEV;
1321
1322 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1323 if (!priv) {
1324 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1325 "%s: memory allocation failure",
1326 CTCM_FUNTAIL);
1327 put_device(&cgdev->dev);
1328 return -ENOMEM;
1329 }
1330 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1331 cgdev->cdev[0]->handler = ctcm_irq_handler;
1332 cgdev->cdev[1]->handler = ctcm_irq_handler;
1333 dev_set_drvdata(&cgdev->dev, priv);
1334 cgdev->dev.type = &ctcm_devtype;
1335
1336 return 0;
1337 }
1338
1339 /**
1340 * Add a new channel to the list of channels.
1341 * Keeps the channel list sorted.
1342 *
1343 * cdev The ccw_device to be added.
1344 * type The type class of the new channel.
1345 * priv Points to the private data of the ccwgroup_device.
1346 *
1347 * returns 0 on success, !0 on error.
1348 */
1349 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1350 struct ctcm_priv *priv)
1351 {
1352 struct channel **c = &channels;
1353 struct channel *ch;
1354 int ccw_num;
1355 int rc = 0;
1356
1357 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1358 "%s(%s), type %d, proto %d",
1359 __func__, dev_name(&cdev->dev), type, priv->protocol);
1360
1361 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1362 if (ch == NULL)
1363 return -ENOMEM;
1364
1365 ch->protocol = priv->protocol;
1366 if (IS_MPC(priv)) {
1367 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1368 if (ch->discontact_th == NULL)
1369 goto nomem_return;
1370
1371 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1372 tasklet_init(&ch->ch_disc_tasklet,
1373 mpc_action_send_discontact, (unsigned long)ch);
1374
1375 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1376 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1377 ccw_num = 17;
1378 } else
1379 ccw_num = 8;
1380
1381 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1382 if (ch->ccw == NULL)
1383 goto nomem_return;
1384
1385 ch->cdev = cdev;
1386 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1387 ch->type = type;
1388
1389 /**
1390 * "static" ccws are used in the following way:
1391 *
1392 * ccw[0..2] (Channel program for generic I/O):
1393 * 0: prepare
1394 * 1: read or write (depending on direction) with fixed
1395 * buffer (idal allocated once when buffer is allocated)
1396 * 2: nop
1397 * ccw[3..5] (Channel program for direct write of packets)
1398 * 3: prepare
1399 * 4: write (idal allocated on every write).
1400 * 5: nop
1401 * ccw[6..7] (Channel program for initial channel setup):
1402 * 6: set extended mode
1403 * 7: nop
1404 *
1405 * ch->ccw[0..5] are initialized in ch_action_start because
1406 * the channel's direction is yet unknown here.
1407 *
1408 * ccws used for xid2 negotiations
1409 * ch-ccw[8-14] need to be used for the XID exchange either
1410 * X side XID2 Processing
1411 * 8: write control
1412 * 9: write th
1413 * 10: write XID
1414 * 11: read th from secondary
1415 * 12: read XID from secondary
1416 * 13: read 4 byte ID
1417 * 14: nop
1418 * Y side XID Processing
1419 * 8: sense
1420 * 9: read th
1421 * 10: read XID
1422 * 11: write th
1423 * 12: write XID
1424 * 13: write 4 byte ID
1425 * 14: nop
1426 *
1427 * ccws used for double noop due to VM timing issues
1428 * which result in unrecoverable Busy on channel
1429 * 15: nop
1430 * 16: nop
1431 */
1432 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1433 ch->ccw[6].flags = CCW_FLAG_SLI;
1434
1435 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1436 ch->ccw[7].flags = CCW_FLAG_SLI;
1437
1438 if (IS_MPC(priv)) {
1439 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1440 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1441 ch->ccw[15].count = TH_HEADER_LENGTH;
1442 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1443
1444 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1445 ch->ccw[16].flags = CCW_FLAG_SLI;
1446
1447 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1448 ctc_ch_event_names, CTC_MPC_NR_STATES,
1449 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1450 mpc_ch_fsm_len, GFP_KERNEL);
1451 } else {
1452 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1453 ctc_ch_event_names, CTC_NR_STATES,
1454 CTC_NR_EVENTS, ch_fsm,
1455 ch_fsm_len, GFP_KERNEL);
1456 }
1457 if (ch->fsm == NULL)
1458 goto nomem_return;
1459
1460 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1461
1462 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1463 if (ch->irb == NULL)
1464 goto nomem_return;
1465
1466 while (*c && ctcm_less_than((*c)->id, ch->id))
1467 c = &(*c)->next;
1468
1469 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1470 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1471 "%s (%s) already in list, using old entry",
1472 __func__, (*c)->id);
1473
1474 goto free_return;
1475 }
1476
1477 spin_lock_init(&ch->collect_lock);
1478
1479 fsm_settimer(ch->fsm, &ch->timer);
1480 skb_queue_head_init(&ch->io_queue);
1481 skb_queue_head_init(&ch->collect_queue);
1482
1483 if (IS_MPC(priv)) {
1484 fsm_settimer(ch->fsm, &ch->sweep_timer);
1485 skb_queue_head_init(&ch->sweep_queue);
1486 }
1487 ch->next = *c;
1488 *c = ch;
1489 return 0;
1490
1491 nomem_return:
1492 rc = -ENOMEM;
1493
1494 free_return: /* note that all channel pointers are 0 or valid */
1495 kfree(ch->ccw);
1496 kfree(ch->discontact_th);
1497 kfree_fsm(ch->fsm);
1498 kfree(ch->irb);
1499 kfree(ch);
1500 return rc;
1501 }
1502
1503 /*
1504 * Return type of a detected device.
1505 */
1506 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1507 {
1508 enum ctcm_channel_types type;
1509 type = (enum ctcm_channel_types)id->driver_info;
1510
1511 if (type == ctcm_channel_type_ficon)
1512 type = ctcm_channel_type_escon;
1513
1514 return type;
1515 }
1516
1517 /**
1518 *
1519 * Setup an interface.
1520 *
1521 * cgdev Device to be setup.
1522 *
1523 * returns 0 on success, !0 on failure.
1524 */
1525 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1526 {
1527 char read_id[CTCM_ID_SIZE];
1528 char write_id[CTCM_ID_SIZE];
1529 int direction;
1530 enum ctcm_channel_types type;
1531 struct ctcm_priv *priv;
1532 struct net_device *dev;
1533 struct ccw_device *cdev0;
1534 struct ccw_device *cdev1;
1535 struct channel *readc;
1536 struct channel *writec;
1537 int ret;
1538 int result;
1539
1540 priv = dev_get_drvdata(&cgdev->dev);
1541 if (!priv) {
1542 result = -ENODEV;
1543 goto out_err_result;
1544 }
1545
1546 cdev0 = cgdev->cdev[0];
1547 cdev1 = cgdev->cdev[1];
1548
1549 type = get_channel_type(&cdev0->id);
1550
1551 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1552 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1553
1554 ret = add_channel(cdev0, type, priv);
1555 if (ret) {
1556 result = ret;
1557 goto out_err_result;
1558 }
1559 ret = add_channel(cdev1, type, priv);
1560 if (ret) {
1561 result = ret;
1562 goto out_remove_channel1;
1563 }
1564
1565 ret = ccw_device_set_online(cdev0);
1566 if (ret != 0) {
1567 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1568 "%s(%s) set_online rc=%d",
1569 CTCM_FUNTAIL, read_id, ret);
1570 result = -EIO;
1571 goto out_remove_channel2;
1572 }
1573
1574 ret = ccw_device_set_online(cdev1);
1575 if (ret != 0) {
1576 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1577 "%s(%s) set_online rc=%d",
1578 CTCM_FUNTAIL, write_id, ret);
1579
1580 result = -EIO;
1581 goto out_ccw1;
1582 }
1583
1584 dev = ctcm_init_netdevice(priv);
1585 if (dev == NULL) {
1586 result = -ENODEV;
1587 goto out_ccw2;
1588 }
1589
1590 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1591 priv->channel[direction] =
1592 channel_get(type, direction == CTCM_READ ?
1593 read_id : write_id, direction);
1594 if (priv->channel[direction] == NULL) {
1595 if (direction == CTCM_WRITE)
1596 channel_free(priv->channel[CTCM_READ]);
1597 goto out_dev;
1598 }
1599 priv->channel[direction]->netdev = dev;
1600 priv->channel[direction]->protocol = priv->protocol;
1601 priv->channel[direction]->max_bufsize = priv->buffer_size;
1602 }
1603 /* sysfs magic */
1604 SET_NETDEV_DEV(dev, &cgdev->dev);
1605
1606 if (register_netdev(dev)) {
1607 result = -ENODEV;
1608 goto out_dev;
1609 }
1610
1611 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1612
1613 dev_info(&dev->dev,
1614 "setup OK : r/w = %s/%s, protocol : %d\n",
1615 priv->channel[CTCM_READ]->id,
1616 priv->channel[CTCM_WRITE]->id, priv->protocol);
1617
1618 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1619 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1620 priv->channel[CTCM_READ]->id,
1621 priv->channel[CTCM_WRITE]->id, priv->protocol);
1622
1623 return 0;
1624 out_dev:
1625 ctcm_free_netdevice(dev);
1626 out_ccw2:
1627 ccw_device_set_offline(cgdev->cdev[1]);
1628 out_ccw1:
1629 ccw_device_set_offline(cgdev->cdev[0]);
1630 out_remove_channel2:
1631 readc = channel_get(type, read_id, CTCM_READ);
1632 channel_remove(readc);
1633 out_remove_channel1:
1634 writec = channel_get(type, write_id, CTCM_WRITE);
1635 channel_remove(writec);
1636 out_err_result:
1637 return result;
1638 }
1639
1640 /**
1641 * Shutdown an interface.
1642 *
1643 * cgdev Device to be shut down.
1644 *
1645 * returns 0 on success, !0 on failure.
1646 */
1647 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1648 {
1649 struct ctcm_priv *priv;
1650 struct net_device *dev;
1651
1652 priv = dev_get_drvdata(&cgdev->dev);
1653 if (!priv)
1654 return -ENODEV;
1655
1656 if (priv->channel[CTCM_READ]) {
1657 dev = priv->channel[CTCM_READ]->netdev;
1658 CTCM_DBF_DEV(SETUP, dev, "");
1659 /* Close the device */
1660 ctcm_close(dev);
1661 dev->flags &= ~IFF_RUNNING;
1662 channel_free(priv->channel[CTCM_READ]);
1663 } else
1664 dev = NULL;
1665
1666 if (priv->channel[CTCM_WRITE])
1667 channel_free(priv->channel[CTCM_WRITE]);
1668
1669 if (dev) {
1670 unregister_netdev(dev);
1671 ctcm_free_netdevice(dev);
1672 }
1673
1674 if (priv->fsm)
1675 kfree_fsm(priv->fsm);
1676
1677 ccw_device_set_offline(cgdev->cdev[1]);
1678 ccw_device_set_offline(cgdev->cdev[0]);
1679 channel_remove(priv->channel[CTCM_READ]);
1680 channel_remove(priv->channel[CTCM_WRITE]);
1681 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1682
1683 return 0;
1684
1685 }
1686
1687
1688 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1689 {
1690 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1691
1692 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1693 "removing device %p, proto : %d",
1694 cgdev, priv->protocol);
1695
1696 if (cgdev->state == CCWGROUP_ONLINE)
1697 ctcm_shutdown_device(cgdev);
1698 dev_set_drvdata(&cgdev->dev, NULL);
1699 kfree(priv);
1700 put_device(&cgdev->dev);
1701 }
1702
1703 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1704 {
1705 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1706
1707 if (gdev->state == CCWGROUP_OFFLINE)
1708 return 0;
1709 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1710 ctcm_close(priv->channel[CTCM_READ]->netdev);
1711 if (!wait_event_timeout(priv->fsm->wait_q,
1712 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1713 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1714 return -EBUSY;
1715 }
1716 ccw_device_set_offline(gdev->cdev[1]);
1717 ccw_device_set_offline(gdev->cdev[0]);
1718 return 0;
1719 }
1720
1721 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1722 {
1723 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1724 int rc;
1725
1726 if (gdev->state == CCWGROUP_OFFLINE)
1727 return 0;
1728 rc = ccw_device_set_online(gdev->cdev[1]);
1729 if (rc)
1730 goto err_out;
1731 rc = ccw_device_set_online(gdev->cdev[0]);
1732 if (rc)
1733 goto err_out;
1734 ctcm_open(priv->channel[CTCM_READ]->netdev);
1735 err_out:
1736 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1737 return rc;
1738 }
1739
1740 static struct ccw_device_id ctcm_ids[] = {
1741 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1742 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1743 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1744 {},
1745 };
1746 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1747
1748 static struct ccw_driver ctcm_ccw_driver = {
1749 .driver = {
1750 .owner = THIS_MODULE,
1751 .name = "ctcm",
1752 },
1753 .ids = ctcm_ids,
1754 .probe = ccwgroup_probe_ccwdev,
1755 .remove = ccwgroup_remove_ccwdev,
1756 .int_class = IRQIO_CTC,
1757 };
1758
1759 static struct ccwgroup_driver ctcm_group_driver = {
1760 .driver = {
1761 .owner = THIS_MODULE,
1762 .name = CTC_DRIVER_NAME,
1763 },
1764 .setup = ctcm_probe_device,
1765 .remove = ctcm_remove_device,
1766 .set_online = ctcm_new_device,
1767 .set_offline = ctcm_shutdown_device,
1768 .freeze = ctcm_pm_suspend,
1769 .thaw = ctcm_pm_resume,
1770 .restore = ctcm_pm_resume,
1771 };
1772
1773 static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1774 const char *buf, size_t count)
1775 {
1776 int err;
1777
1778 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1779 return err ? err : count;
1780 }
1781 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1782
1783 static struct attribute *ctcm_drv_attrs[] = {
1784 &driver_attr_group.attr,
1785 NULL,
1786 };
1787 static struct attribute_group ctcm_drv_attr_group = {
1788 .attrs = ctcm_drv_attrs,
1789 };
1790 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1791 &ctcm_drv_attr_group,
1792 NULL,
1793 };
1794
1795 /*
1796 * Module related routines
1797 */
1798
1799 /*
1800 * Prepare to be unloaded. Free IRQ's and release all resources.
1801 * This is called just before this module is unloaded. It is
1802 * not called, if the usage count is !0, so we don't need to check
1803 * for that.
1804 */
1805 static void __exit ctcm_exit(void)
1806 {
1807 ccwgroup_driver_unregister(&ctcm_group_driver);
1808 ccw_driver_unregister(&ctcm_ccw_driver);
1809 root_device_unregister(ctcm_root_dev);
1810 ctcm_unregister_dbf_views();
1811 pr_info("CTCM driver unloaded\n");
1812 }
1813
1814 /*
1815 * Print Banner.
1816 */
1817 static void print_banner(void)
1818 {
1819 pr_info("CTCM driver initialized\n");
1820 }
1821
1822 /**
1823 * Initialize module.
1824 * This is called just after the module is loaded.
1825 *
1826 * returns 0 on success, !0 on error.
1827 */
1828 static int __init ctcm_init(void)
1829 {
1830 int ret;
1831
1832 channels = NULL;
1833
1834 ret = ctcm_register_dbf_views();
1835 if (ret)
1836 goto out_err;
1837 ctcm_root_dev = root_device_register("ctcm");
1838 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1839 if (ret)
1840 goto register_err;
1841 ret = ccw_driver_register(&ctcm_ccw_driver);
1842 if (ret)
1843 goto ccw_err;
1844 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1845 ret = ccwgroup_driver_register(&ctcm_group_driver);
1846 if (ret)
1847 goto ccwgroup_err;
1848 print_banner();
1849 return 0;
1850
1851 ccwgroup_err:
1852 ccw_driver_unregister(&ctcm_ccw_driver);
1853 ccw_err:
1854 root_device_unregister(ctcm_root_dev);
1855 register_err:
1856 ctcm_unregister_dbf_views();
1857 out_err:
1858 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1859 __func__, ret);
1860 return ret;
1861 }
1862
1863 module_init(ctcm_init);
1864 module_exit(ctcm_exit);
1865
1866 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1867 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1868 MODULE_LICENSE("GPL");
1869
(deprecated) Btrfs devel tree