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lockdep: Reintroduce generation count to make BFS faster
[linux-2.6.git] / drivers / s390 / net / ctcm_main.c
blob222e4739443715902dd5e5ce38b1f5a924b4e3cb
1 /*
2 * drivers/s390/net/ctcm_main.c
3 *
4 * Copyright IBM Corp. 2001, 2009
5 * Author(s):
6 * Original CTC driver(s):
7 * Fritz Elfert (felfert@millenux.com)
8 * Dieter Wellerdiek (wel@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 * Denis Joseph Barrow (barrow_dj@yahoo.com)
11 * Jochen Roehrig (roehrig@de.ibm.com)
12 * Cornelia Huck <cornelia.huck@de.ibm.com>
13 * MPC additions:
14 * Belinda Thompson (belindat@us.ibm.com)
15 * Andy Richter (richtera@us.ibm.com)
16 * Revived by:
17 * Peter Tiedemann (ptiedem@de.ibm.com)
18 */
19
20 #undef DEBUG
21 #undef DEBUGDATA
22 #undef DEBUGCCW
23
24 #define KMSG_COMPONENT "ctcm"
25 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/interrupt.h>
34 #include <linux/timer.h>
35 #include <linux/bitops.h>
36
37 #include <linux/signal.h>
38 #include <linux/string.h>
39
40 #include <linux/ip.h>
41 #include <linux/if_arp.h>
42 #include <linux/tcp.h>
43 #include <linux/skbuff.h>
44 #include <linux/ctype.h>
45 #include <net/dst.h>
46
47 #include <linux/io.h>
48 #include <asm/ccwdev.h>
49 #include <asm/ccwgroup.h>
50 #include <linux/uaccess.h>
51
52 #include <asm/idals.h>
53
54 #include "cu3088.h"
55 #include "ctcm_fsms.h"
56 #include "ctcm_main.h"
57
58 /* Some common global variables */
59
60 /*
61 * Linked list of all detected channels.
62 */
63 struct channel *channels;
64
65 /**
66 * Unpack a just received skb and hand it over to
67 * upper layers.
68 *
69 * ch The channel where this skb has been received.
70 * pskb The received skb.
71 */
72 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
73 {
74 struct net_device *dev = ch->netdev;
75 struct ctcm_priv *priv = dev->ml_priv;
76 __u16 len = *((__u16 *) pskb->data);
77
78 skb_put(pskb, 2 + LL_HEADER_LENGTH);
79 skb_pull(pskb, 2);
80 pskb->dev = dev;
81 pskb->ip_summed = CHECKSUM_UNNECESSARY;
82 while (len > 0) {
83 struct sk_buff *skb;
84 int skblen;
85 struct ll_header *header = (struct ll_header *)pskb->data;
86
87 skb_pull(pskb, LL_HEADER_LENGTH);
88 if ((ch->protocol == CTCM_PROTO_S390) &&
89 (header->type != ETH_P_IP)) {
90 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
91 ch->logflags |= LOG_FLAG_ILLEGALPKT;
92 /*
93 * Check packet type only if we stick strictly
94 * to S/390's protocol of OS390. This only
95 * supports IP. Otherwise allow any packet
96 * type.
97 */
98 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
99 "%s(%s): Illegal packet type 0x%04x"
100 " - dropping",
101 CTCM_FUNTAIL, dev->name, header->type);
102 }
103 priv->stats.rx_dropped++;
104 priv->stats.rx_frame_errors++;
105 return;
106 }
107 pskb->protocol = ntohs(header->type);
108 if ((header->length <= LL_HEADER_LENGTH) ||
109 (len <= LL_HEADER_LENGTH)) {
110 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
111 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
112 "%s(%s): Illegal packet size %d(%d,%d)"
113 "- dropping",
114 CTCM_FUNTAIL, dev->name,
115 header->length, dev->mtu, len);
116 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
117 }
118
119 priv->stats.rx_dropped++;
120 priv->stats.rx_length_errors++;
121 return;
122 }
123 header->length -= LL_HEADER_LENGTH;
124 len -= LL_HEADER_LENGTH;
125 if ((header->length > skb_tailroom(pskb)) ||
126 (header->length > len)) {
127 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
128 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
129 "%s(%s): Packet size %d (overrun)"
130 " - dropping", CTCM_FUNTAIL,
131 dev->name, header->length);
132 ch->logflags |= LOG_FLAG_OVERRUN;
133 }
134
135 priv->stats.rx_dropped++;
136 priv->stats.rx_length_errors++;
137 return;
138 }
139 skb_put(pskb, header->length);
140 skb_reset_mac_header(pskb);
141 len -= header->length;
142 skb = dev_alloc_skb(pskb->len);
143 if (!skb) {
144 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
146 "%s(%s): MEMORY allocation error",
147 CTCM_FUNTAIL, dev->name);
148 ch->logflags |= LOG_FLAG_NOMEM;
149 }
150 priv->stats.rx_dropped++;
151 return;
152 }
153 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
154 pskb->len);
155 skb_reset_mac_header(skb);
156 skb->dev = pskb->dev;
157 skb->protocol = pskb->protocol;
158 pskb->ip_summed = CHECKSUM_UNNECESSARY;
159 skblen = skb->len;
160 /*
161 * reset logflags
162 */
163 ch->logflags = 0;
164 priv->stats.rx_packets++;
165 priv->stats.rx_bytes += skblen;
166 netif_rx_ni(skb);
167 dev->last_rx = jiffies;
168 if (len > 0) {
169 skb_pull(pskb, header->length);
170 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
171 CTCM_DBF_DEV_NAME(TRACE, dev,
172 "Overrun in ctcm_unpack_skb");
173 ch->logflags |= LOG_FLAG_OVERRUN;
174 return;
175 }
176 skb_put(pskb, LL_HEADER_LENGTH);
177 }
178 }
179 }
180
181 /**
182 * Release a specific channel in the channel list.
183 *
184 * ch Pointer to channel struct to be released.
185 */
186 static void channel_free(struct channel *ch)
187 {
188 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
189 ch->flags &= ~CHANNEL_FLAGS_INUSE;
190 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
191 }
192
193 /**
194 * Remove a specific channel in the channel list.
195 *
196 * ch Pointer to channel struct to be released.
197 */
198 static void channel_remove(struct channel *ch)
199 {
200 struct channel **c = &channels;
201 char chid[CTCM_ID_SIZE+1];
202 int ok = 0;
203
204 if (ch == NULL)
205 return;
206 else
207 strncpy(chid, ch->id, CTCM_ID_SIZE);
208
209 channel_free(ch);
210 while (*c) {
211 if (*c == ch) {
212 *c = ch->next;
213 fsm_deltimer(&ch->timer);
214 if (IS_MPC(ch))
215 fsm_deltimer(&ch->sweep_timer);
216
217 kfree_fsm(ch->fsm);
218 clear_normalized_cda(&ch->ccw[4]);
219 if (ch->trans_skb != NULL) {
220 clear_normalized_cda(&ch->ccw[1]);
221 dev_kfree_skb_any(ch->trans_skb);
222 }
223 if (IS_MPC(ch)) {
224 tasklet_kill(&ch->ch_tasklet);
225 tasklet_kill(&ch->ch_disc_tasklet);
226 kfree(ch->discontact_th);
227 }
228 kfree(ch->ccw);
229 kfree(ch->irb);
230 kfree(ch);
231 ok = 1;
232 break;
233 }
234 c = &((*c)->next);
235 }
236
237 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
238 chid, ok ? "OK" : "failed");
239 }
240
241 /**
242 * Get a specific channel from the channel list.
243 *
244 * type Type of channel we are interested in.
245 * id Id of channel we are interested in.
246 * direction Direction we want to use this channel for.
247 *
248 * returns Pointer to a channel or NULL if no matching channel available.
249 */
250 static struct channel *channel_get(enum channel_types type,
251 char *id, int direction)
252 {
253 struct channel *ch = channels;
254
255 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
256 ch = ch->next;
257 if (!ch) {
258 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
259 "%s(%d, %s, %d) not found in channel list\n",
260 CTCM_FUNTAIL, type, id, direction);
261 } else {
262 if (ch->flags & CHANNEL_FLAGS_INUSE)
263 ch = NULL;
264 else {
265 ch->flags |= CHANNEL_FLAGS_INUSE;
266 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
267 ch->flags |= (direction == WRITE)
268 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
269 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
270 }
271 }
272 return ch;
273 }
274
275 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
276 {
277 if (!IS_ERR(irb))
278 return 0;
279
280 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
281 "irb error %ld on device %s\n",
282 PTR_ERR(irb), dev_name(&cdev->dev));
283
284 switch (PTR_ERR(irb)) {
285 case -EIO:
286 dev_err(&cdev->dev,
287 "An I/O-error occurred on the CTCM device\n");
288 break;
289 case -ETIMEDOUT:
290 dev_err(&cdev->dev,
291 "An adapter hardware operation timed out\n");
292 break;
293 default:
294 dev_err(&cdev->dev,
295 "An error occurred on the adapter hardware\n");
296 }
297 return PTR_ERR(irb);
298 }
299
300
301 /**
302 * Check sense of a unit check.
303 *
304 * ch The channel, the sense code belongs to.
305 * sense The sense code to inspect.
306 */
307 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
308 {
309 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
310 "%s(%s): %02x",
311 CTCM_FUNTAIL, ch->id, sense);
312
313 if (sense & SNS0_INTERVENTION_REQ) {
314 if (sense & 0x01) {
315 if (ch->sense_rc != 0x01) {
316 pr_notice(
317 "%s: The communication peer has "
318 "disconnected\n", ch->id);
319 ch->sense_rc = 0x01;
320 }
321 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
322 } else {
323 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
324 pr_notice(
325 "%s: The remote operating system is "
326 "not available\n", ch->id);
327 ch->sense_rc = SNS0_INTERVENTION_REQ;
328 }
329 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
330 }
331 } else if (sense & SNS0_EQUIPMENT_CHECK) {
332 if (sense & SNS0_BUS_OUT_CHECK) {
333 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
334 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
335 "%s(%s): remote HW error %02x",
336 CTCM_FUNTAIL, ch->id, sense);
337 ch->sense_rc = SNS0_BUS_OUT_CHECK;
338 }
339 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
340 } else {
341 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
342 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
343 "%s(%s): remote read parity error %02x",
344 CTCM_FUNTAIL, ch->id, sense);
345 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
346 }
347 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
348 }
349 } else if (sense & SNS0_BUS_OUT_CHECK) {
350 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
351 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
352 "%s(%s): BUS OUT error %02x",
353 CTCM_FUNTAIL, ch->id, sense);
354 ch->sense_rc = SNS0_BUS_OUT_CHECK;
355 }
356 if (sense & 0x04) /* data-streaming timeout */
357 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
358 else /* Data-transfer parity error */
359 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
360 } else if (sense & SNS0_CMD_REJECT) {
361 if (ch->sense_rc != SNS0_CMD_REJECT) {
362 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
363 "%s(%s): Command rejected",
364 CTCM_FUNTAIL, ch->id);
365 ch->sense_rc = SNS0_CMD_REJECT;
366 }
367 } else if (sense == 0) {
368 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
369 "%s(%s): Unit check ZERO",
370 CTCM_FUNTAIL, ch->id);
371 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
372 } else {
373 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
374 "%s(%s): Unit check code %02x unknown",
375 CTCM_FUNTAIL, ch->id, sense);
376 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
377 }
378 }
379
380 int ctcm_ch_alloc_buffer(struct channel *ch)
381 {
382 clear_normalized_cda(&ch->ccw[1]);
383 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
384 if (ch->trans_skb == NULL) {
385 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
386 "%s(%s): %s trans_skb allocation error",
387 CTCM_FUNTAIL, ch->id,
388 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
389 return -ENOMEM;
390 }
391
392 ch->ccw[1].count = ch->max_bufsize;
393 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
394 dev_kfree_skb(ch->trans_skb);
395 ch->trans_skb = NULL;
396 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
397 "%s(%s): %s set norm_cda failed",
398 CTCM_FUNTAIL, ch->id,
399 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
400 return -ENOMEM;
401 }
402
403 ch->ccw[1].count = 0;
404 ch->trans_skb_data = ch->trans_skb->data;
405 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
406 return 0;
407 }
408
409 /*
410 * Interface API for upper network layers
411 */
412
413 /**
414 * Open an interface.
415 * Called from generic network layer when ifconfig up is run.
416 *
417 * dev Pointer to interface struct.
418 *
419 * returns 0 on success, -ERRNO on failure. (Never fails.)
420 */
421 int ctcm_open(struct net_device *dev)
422 {
423 struct ctcm_priv *priv = dev->ml_priv;
424
425 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
426 if (!IS_MPC(priv))
427 fsm_event(priv->fsm, DEV_EVENT_START, dev);
428 return 0;
429 }
430
431 /**
432 * Close an interface.
433 * Called from generic network layer when ifconfig down is run.
434 *
435 * dev Pointer to interface struct.
436 *
437 * returns 0 on success, -ERRNO on failure. (Never fails.)
438 */
439 int ctcm_close(struct net_device *dev)
440 {
441 struct ctcm_priv *priv = dev->ml_priv;
442
443 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
444 if (!IS_MPC(priv))
445 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
446 return 0;
447 }
448
449
450 /**
451 * Transmit a packet.
452 * This is a helper function for ctcm_tx().
453 *
454 * ch Channel to be used for sending.
455 * skb Pointer to struct sk_buff of packet to send.
456 * The linklevel header has already been set up
457 * by ctcm_tx().
458 *
459 * returns 0 on success, -ERRNO on failure. (Never fails.)
460 */
461 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
462 {
463 unsigned long saveflags;
464 struct ll_header header;
465 int rc = 0;
466 __u16 block_len;
467 int ccw_idx;
468 struct sk_buff *nskb;
469 unsigned long hi;
470
471 /* we need to acquire the lock for testing the state
472 * otherwise we can have an IRQ changing the state to
473 * TXIDLE after the test but before acquiring the lock.
474 */
475 spin_lock_irqsave(&ch->collect_lock, saveflags);
476 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
477 int l = skb->len + LL_HEADER_LENGTH;
478
479 if (ch->collect_len + l > ch->max_bufsize - 2) {
480 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
481 return -EBUSY;
482 } else {
483 atomic_inc(&skb->users);
484 header.length = l;
485 header.type = skb->protocol;
486 header.unused = 0;
487 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
488 LL_HEADER_LENGTH);
489 skb_queue_tail(&ch->collect_queue, skb);
490 ch->collect_len += l;
491 }
492 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
493 goto done;
494 }
495 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
496 /*
497 * Protect skb against beeing free'd by upper
498 * layers.
499 */
500 atomic_inc(&skb->users);
501 ch->prof.txlen += skb->len;
502 header.length = skb->len + LL_HEADER_LENGTH;
503 header.type = skb->protocol;
504 header.unused = 0;
505 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
506 block_len = skb->len + 2;
507 *((__u16 *)skb_push(skb, 2)) = block_len;
508
509 /*
510 * IDAL support in CTCM is broken, so we have to
511 * care about skb's above 2G ourselves.
512 */
513 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
514 if (hi) {
515 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
516 if (!nskb) {
517 atomic_dec(&skb->users);
518 skb_pull(skb, LL_HEADER_LENGTH + 2);
519 ctcm_clear_busy(ch->netdev);
520 return -ENOMEM;
521 } else {
522 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
523 atomic_inc(&nskb->users);
524 atomic_dec(&skb->users);
525 dev_kfree_skb_irq(skb);
526 skb = nskb;
527 }
528 }
529
530 ch->ccw[4].count = block_len;
531 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
532 /*
533 * idal allocation failed, try via copying to
534 * trans_skb. trans_skb usually has a pre-allocated
535 * idal.
536 */
537 if (ctcm_checkalloc_buffer(ch)) {
538 /*
539 * Remove our header. It gets added
540 * again on retransmit.
541 */
542 atomic_dec(&skb->users);
543 skb_pull(skb, LL_HEADER_LENGTH + 2);
544 ctcm_clear_busy(ch->netdev);
545 return -ENOMEM;
546 }
547
548 skb_reset_tail_pointer(ch->trans_skb);
549 ch->trans_skb->len = 0;
550 ch->ccw[1].count = skb->len;
551 skb_copy_from_linear_data(skb,
552 skb_put(ch->trans_skb, skb->len), skb->len);
553 atomic_dec(&skb->users);
554 dev_kfree_skb_irq(skb);
555 ccw_idx = 0;
556 } else {
557 skb_queue_tail(&ch->io_queue, skb);
558 ccw_idx = 3;
559 }
560 ch->retry = 0;
561 fsm_newstate(ch->fsm, CTC_STATE_TX);
562 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
563 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
564 ch->prof.send_stamp = current_kernel_time(); /* xtime */
565 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
566 (unsigned long)ch, 0xff, 0);
567 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
568 if (ccw_idx == 3)
569 ch->prof.doios_single++;
570 if (rc != 0) {
571 fsm_deltimer(&ch->timer);
572 ctcm_ccw_check_rc(ch, rc, "single skb TX");
573 if (ccw_idx == 3)
574 skb_dequeue_tail(&ch->io_queue);
575 /*
576 * Remove our header. It gets added
577 * again on retransmit.
578 */
579 skb_pull(skb, LL_HEADER_LENGTH + 2);
580 } else if (ccw_idx == 0) {
581 struct net_device *dev = ch->netdev;
582 struct ctcm_priv *priv = dev->ml_priv;
583 priv->stats.tx_packets++;
584 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
585 }
586 done:
587 ctcm_clear_busy(ch->netdev);
588 return rc;
589 }
590
591 static void ctcmpc_send_sweep_req(struct channel *rch)
592 {
593 struct net_device *dev = rch->netdev;
594 struct ctcm_priv *priv;
595 struct mpc_group *grp;
596 struct th_sweep *header;
597 struct sk_buff *sweep_skb;
598 struct channel *ch;
599 /* int rc = 0; */
600
601 priv = dev->ml_priv;
602 grp = priv->mpcg;
603 ch = priv->channel[WRITE];
604
605 /* sweep processing is not complete until response and request */
606 /* has completed for all read channels in group */
607 if (grp->in_sweep == 0) {
608 grp->in_sweep = 1;
609 grp->sweep_rsp_pend_num = grp->active_channels[READ];
610 grp->sweep_req_pend_num = grp->active_channels[READ];
611 }
612
613 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
614
615 if (sweep_skb == NULL) {
616 /* rc = -ENOMEM; */
617 goto nomem;
618 }
619
620 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
621
622 if (!header) {
623 dev_kfree_skb_any(sweep_skb);
624 /* rc = -ENOMEM; */
625 goto nomem;
626 }
627
628 header->th.th_seg = 0x00 ;
629 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
630 header->th.th_blk_flag = 0x00;
631 header->th.th_is_xid = 0x00;
632 header->th.th_seq_num = 0x00;
633 header->sw.th_last_seq = ch->th_seq_num;
634
635 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
636
637 kfree(header);
638
639 dev->trans_start = jiffies;
640 skb_queue_tail(&ch->sweep_queue, sweep_skb);
641
642 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
643
644 return;
645
646 nomem:
647 grp->in_sweep = 0;
648 ctcm_clear_busy(dev);
649 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
650
651 return;
652 }
653
654 /*
655 * MPC mode version of transmit_skb
656 */
657 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
658 {
659 struct pdu *p_header;
660 struct net_device *dev = ch->netdev;
661 struct ctcm_priv *priv = dev->ml_priv;
662 struct mpc_group *grp = priv->mpcg;
663 struct th_header *header;
664 struct sk_buff *nskb;
665 int rc = 0;
666 int ccw_idx;
667 unsigned long hi;
668 unsigned long saveflags = 0; /* avoids compiler warning */
669 __u16 block_len;
670
671 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
672 __func__, dev->name, smp_processor_id(), ch,
673 ch->id, fsm_getstate_str(ch->fsm));
674
675 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
676 spin_lock_irqsave(&ch->collect_lock, saveflags);
677 atomic_inc(&skb->users);
678 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
679
680 if (!p_header) {
681 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
682 goto nomem_exit;
683 }
684
685 p_header->pdu_offset = skb->len;
686 p_header->pdu_proto = 0x01;
687 p_header->pdu_flag = 0x00;
688 if (skb->protocol == ntohs(ETH_P_SNAP)) {
689 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
690 } else {
691 p_header->pdu_flag |= PDU_FIRST;
692 }
693 p_header->pdu_seq = 0;
694 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
695 PDU_HEADER_LENGTH);
696
697 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
698 "pdu header and data for up to 32 bytes:\n",
699 __func__, dev->name, skb->len);
700 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
701
702 skb_queue_tail(&ch->collect_queue, skb);
703 ch->collect_len += skb->len;
704 kfree(p_header);
705
706 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
707 goto done;
708 }
709
710 /*
711 * Protect skb against beeing free'd by upper
712 * layers.
713 */
714 atomic_inc(&skb->users);
715
716 block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
717 /*
718 * IDAL support in CTCM is broken, so we have to
719 * care about skb's above 2G ourselves.
720 */
721 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
722 if (hi) {
723 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
724 if (!nskb) {
725 goto nomem_exit;
726 } else {
727 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
728 atomic_inc(&nskb->users);
729 atomic_dec(&skb->users);
730 dev_kfree_skb_irq(skb);
731 skb = nskb;
732 }
733 }
734
735 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
736
737 if (!p_header)
738 goto nomem_exit;
739
740 p_header->pdu_offset = skb->len;
741 p_header->pdu_proto = 0x01;
742 p_header->pdu_flag = 0x00;
743 p_header->pdu_seq = 0;
744 if (skb->protocol == ntohs(ETH_P_SNAP)) {
745 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
746 } else {
747 p_header->pdu_flag |= PDU_FIRST;
748 }
749 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
750
751 kfree(p_header);
752
753 if (ch->collect_len > 0) {
754 spin_lock_irqsave(&ch->collect_lock, saveflags);
755 skb_queue_tail(&ch->collect_queue, skb);
756 ch->collect_len += skb->len;
757 skb = skb_dequeue(&ch->collect_queue);
758 ch->collect_len -= skb->len;
759 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
760 }
761
762 p_header = (struct pdu *)skb->data;
763 p_header->pdu_flag |= PDU_LAST;
764
765 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
766
767 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
768 if (!header)
769 goto nomem_exit;
770
771 header->th_seg = 0x00;
772 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
773 header->th_blk_flag = 0x00;
774 header->th_is_xid = 0x00; /* Just data here */
775 ch->th_seq_num++;
776 header->th_seq_num = ch->th_seq_num;
777
778 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
779 __func__, dev->name, ch->th_seq_num);
780
781 /* put the TH on the packet */
782 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
783
784 kfree(header);
785
786 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
787 "up to 32 bytes sent to vtam:\n",
788 __func__, dev->name, skb->len);
789 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
790
791 ch->ccw[4].count = skb->len;
792 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
793 /*
794 * idal allocation failed, try via copying to trans_skb.
795 * trans_skb usually has a pre-allocated idal.
796 */
797 if (ctcm_checkalloc_buffer(ch)) {
798 /*
799 * Remove our header.
800 * It gets added again on retransmit.
801 */
802 goto nomem_exit;
803 }
804
805 skb_reset_tail_pointer(ch->trans_skb);
806 ch->trans_skb->len = 0;
807 ch->ccw[1].count = skb->len;
808 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
809 atomic_dec(&skb->users);
810 dev_kfree_skb_irq(skb);
811 ccw_idx = 0;
812 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
813 "up to 32 bytes sent to vtam:\n",
814 __func__, dev->name, ch->trans_skb->len);
815 CTCM_D3_DUMP((char *)ch->trans_skb->data,
816 min_t(int, 32, ch->trans_skb->len));
817 } else {
818 skb_queue_tail(&ch->io_queue, skb);
819 ccw_idx = 3;
820 }
821 ch->retry = 0;
822 fsm_newstate(ch->fsm, CTC_STATE_TX);
823 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
824
825 if (do_debug_ccw)
826 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
827 sizeof(struct ccw1) * 3);
828
829 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
830 ch->prof.send_stamp = current_kernel_time(); /* xtime */
831 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
832 (unsigned long)ch, 0xff, 0);
833 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
834 if (ccw_idx == 3)
835 ch->prof.doios_single++;
836 if (rc != 0) {
837 fsm_deltimer(&ch->timer);
838 ctcm_ccw_check_rc(ch, rc, "single skb TX");
839 if (ccw_idx == 3)
840 skb_dequeue_tail(&ch->io_queue);
841 } else if (ccw_idx == 0) {
842 priv->stats.tx_packets++;
843 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
844 }
845 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
846 ctcmpc_send_sweep_req(ch);
847
848 goto done;
849 nomem_exit:
850 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
851 "%s(%s): MEMORY allocation ERROR\n",
852 CTCM_FUNTAIL, ch->id);
853 rc = -ENOMEM;
854 atomic_dec(&skb->users);
855 dev_kfree_skb_any(skb);
856 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
857 done:
858 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
859 return rc;
860 }
861
862 /**
863 * Start transmission of a packet.
864 * Called from generic network device layer.
865 *
866 * skb Pointer to buffer containing the packet.
867 * dev Pointer to interface struct.
868 *
869 * returns 0 if packet consumed, !0 if packet rejected.
870 * Note: If we return !0, then the packet is free'd by
871 * the generic network layer.
872 */
873 /* first merge version - leaving both functions separated */
874 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
875 {
876 struct ctcm_priv *priv = dev->ml_priv;
877
878 if (skb == NULL) {
879 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
880 "%s(%s): NULL sk_buff passed",
881 CTCM_FUNTAIL, dev->name);
882 priv->stats.tx_dropped++;
883 return 0;
884 }
885 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
886 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
887 "%s(%s): Got sk_buff with head room < %ld bytes",
888 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
889 dev_kfree_skb(skb);
890 priv->stats.tx_dropped++;
891 return 0;
892 }
893
894 /*
895 * If channels are not running, try to restart them
896 * and throw away packet.
897 */
898 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
899 fsm_event(priv->fsm, DEV_EVENT_START, dev);
900 dev_kfree_skb(skb);
901 priv->stats.tx_dropped++;
902 priv->stats.tx_errors++;
903 priv->stats.tx_carrier_errors++;
904 return 0;
905 }
906
907 if (ctcm_test_and_set_busy(dev))
908 return NETDEV_TX_BUSY;
909
910 dev->trans_start = jiffies;
911 if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0)
912 return NETDEV_TX_BUSY;
913 return 0;
914 }
915
916 /* unmerged MPC variant of ctcm_tx */
917 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
918 {
919 int len = 0;
920 struct ctcm_priv *priv = dev->ml_priv;
921 struct mpc_group *grp = priv->mpcg;
922 struct sk_buff *newskb = NULL;
923
924 /*
925 * Some sanity checks ...
926 */
927 if (skb == NULL) {
928 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
929 "%s(%s): NULL sk_buff passed",
930 CTCM_FUNTAIL, dev->name);
931 priv->stats.tx_dropped++;
932 goto done;
933 }
934 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
935 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
936 "%s(%s): Got sk_buff with head room < %ld bytes",
937 CTCM_FUNTAIL, dev->name,
938 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
939
940 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
941
942 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
943 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
944
945 if (!newskb) {
946 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
947 "%s: %s: __dev_alloc_skb failed",
948 __func__, dev->name);
949
950 dev_kfree_skb_any(skb);
951 priv->stats.tx_dropped++;
952 priv->stats.tx_errors++;
953 priv->stats.tx_carrier_errors++;
954 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
955 goto done;
956 }
957 newskb->protocol = skb->protocol;
958 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
959 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
960 dev_kfree_skb_any(skb);
961 skb = newskb;
962 }
963
964 /*
965 * If channels are not running,
966 * notify anybody about a link failure and throw
967 * away packet.
968 */
969 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
970 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
971 dev_kfree_skb_any(skb);
972 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
973 "%s(%s): inactive MPCGROUP - dropped",
974 CTCM_FUNTAIL, dev->name);
975 priv->stats.tx_dropped++;
976 priv->stats.tx_errors++;
977 priv->stats.tx_carrier_errors++;
978 goto done;
979 }
980
981 if (ctcm_test_and_set_busy(dev)) {
982 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
983 "%s(%s): device busy - dropped",
984 CTCM_FUNTAIL, dev->name);
985 dev_kfree_skb_any(skb);
986 priv->stats.tx_dropped++;
987 priv->stats.tx_errors++;
988 priv->stats.tx_carrier_errors++;
989 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
990 goto done;
991 }
992
993 dev->trans_start = jiffies;
994 if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) {
995 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
996 "%s(%s): device error - dropped",
997 CTCM_FUNTAIL, dev->name);
998 dev_kfree_skb_any(skb);
999 priv->stats.tx_dropped++;
1000 priv->stats.tx_errors++;
1001 priv->stats.tx_carrier_errors++;
1002 ctcm_clear_busy(dev);
1003 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1004 goto done;
1005 }
1006 ctcm_clear_busy(dev);
1007 done:
1008 if (do_debug)
1009 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1010
1011 return 0; /* handle freeing of skb here */
1012 }
1013
1014
1015 /**
1016 * Sets MTU of an interface.
1017 *
1018 * dev Pointer to interface struct.
1019 * new_mtu The new MTU to use for this interface.
1020 *
1021 * returns 0 on success, -EINVAL if MTU is out of valid range.
1022 * (valid range is 576 .. 65527). If VM is on the
1023 * remote side, maximum MTU is 32760, however this is
1024 * not checked here.
1025 */
1026 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1027 {
1028 struct ctcm_priv *priv;
1029 int max_bufsize;
1030
1031 if (new_mtu < 576 || new_mtu > 65527)
1032 return -EINVAL;
1033
1034 priv = dev->ml_priv;
1035 max_bufsize = priv->channel[READ]->max_bufsize;
1036
1037 if (IS_MPC(priv)) {
1038 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1039 return -EINVAL;
1040 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1041 } else {
1042 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1043 return -EINVAL;
1044 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1045 }
1046 dev->mtu = new_mtu;
1047 return 0;
1048 }
1049
1050 /**
1051 * Returns interface statistics of a device.
1052 *
1053 * dev Pointer to interface struct.
1054 *
1055 * returns Pointer to stats struct of this interface.
1056 */
1057 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1058 {
1059 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1060 }
1061
1062 static void ctcm_free_netdevice(struct net_device *dev)
1063 {
1064 struct ctcm_priv *priv;
1065 struct mpc_group *grp;
1066
1067 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1068 "%s(%s)", CTCM_FUNTAIL, dev->name);
1069 priv = dev->ml_priv;
1070 if (priv) {
1071 grp = priv->mpcg;
1072 if (grp) {
1073 if (grp->fsm)
1074 kfree_fsm(grp->fsm);
1075 if (grp->xid_skb)
1076 dev_kfree_skb(grp->xid_skb);
1077 if (grp->rcvd_xid_skb)
1078 dev_kfree_skb(grp->rcvd_xid_skb);
1079 tasklet_kill(&grp->mpc_tasklet2);
1080 kfree(grp);
1081 priv->mpcg = NULL;
1082 }
1083 if (priv->fsm) {
1084 kfree_fsm(priv->fsm);
1085 priv->fsm = NULL;
1086 }
1087 kfree(priv->xid);
1088 priv->xid = NULL;
1089 /*
1090 * Note: kfree(priv); is done in "opposite" function of
1091 * allocator function probe_device which is remove_device.
1092 */
1093 }
1094 #ifdef MODULE
1095 free_netdev(dev);
1096 #endif
1097 }
1098
1099 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1100
1101 static const struct net_device_ops ctcm_netdev_ops = {
1102 .ndo_open = ctcm_open,
1103 .ndo_stop = ctcm_close,
1104 .ndo_get_stats = ctcm_stats,
1105 .ndo_change_mtu = ctcm_change_mtu,
1106 .ndo_start_xmit = ctcm_tx,
1107 };
1108
1109 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1110 .ndo_open = ctcm_open,
1111 .ndo_stop = ctcm_close,
1112 .ndo_get_stats = ctcm_stats,
1113 .ndo_change_mtu = ctcm_change_mtu,
1114 .ndo_start_xmit = ctcmpc_tx,
1115 };
1116
1117 void static ctcm_dev_setup(struct net_device *dev)
1118 {
1119 dev->type = ARPHRD_SLIP;
1120 dev->tx_queue_len = 100;
1121 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1122 }
1123
1124 /*
1125 * Initialize everything of the net device except the name and the
1126 * channel structs.
1127 */
1128 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1129 {
1130 struct net_device *dev;
1131 struct mpc_group *grp;
1132 if (!priv)
1133 return NULL;
1134
1135 if (IS_MPC(priv))
1136 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1137 else
1138 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1139
1140 if (!dev) {
1141 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1142 "%s: MEMORY allocation ERROR",
1143 CTCM_FUNTAIL);
1144 return NULL;
1145 }
1146 dev->ml_priv = priv;
1147 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1148 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1149 dev_fsm, dev_fsm_len, GFP_KERNEL);
1150 if (priv->fsm == NULL) {
1151 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1152 kfree(dev);
1153 return NULL;
1154 }
1155 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1156 fsm_settimer(priv->fsm, &priv->restart_timer);
1157
1158 if (IS_MPC(priv)) {
1159 /* MPC Group Initializations */
1160 grp = ctcmpc_init_mpc_group(priv);
1161 if (grp == NULL) {
1162 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1163 kfree(dev);
1164 return NULL;
1165 }
1166 tasklet_init(&grp->mpc_tasklet2,
1167 mpc_group_ready, (unsigned long)dev);
1168 dev->mtu = MPC_BUFSIZE_DEFAULT -
1169 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1170
1171 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1172 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1173 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1174 } else {
1175 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1176 dev->netdev_ops = &ctcm_netdev_ops;
1177 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1178 }
1179
1180 CTCMY_DBF_DEV(SETUP, dev, "finished");
1181
1182 return dev;
1183 }
1184
1185 /**
1186 * Main IRQ handler.
1187 *
1188 * cdev The ccw_device the interrupt is for.
1189 * intparm interruption parameter.
1190 * irb interruption response block.
1191 */
1192 static void ctcm_irq_handler(struct ccw_device *cdev,
1193 unsigned long intparm, struct irb *irb)
1194 {
1195 struct channel *ch;
1196 struct net_device *dev;
1197 struct ctcm_priv *priv;
1198 struct ccwgroup_device *cgdev;
1199 int cstat;
1200 int dstat;
1201
1202 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1203 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1204
1205 if (ctcm_check_irb_error(cdev, irb))
1206 return;
1207
1208 cgdev = dev_get_drvdata(&cdev->dev);
1209
1210 cstat = irb->scsw.cmd.cstat;
1211 dstat = irb->scsw.cmd.dstat;
1212
1213 /* Check for unsolicited interrupts. */
1214 if (cgdev == NULL) {
1215 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1216 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1217 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1218 dev_warn(&cdev->dev,
1219 "The adapter received a non-specific IRQ\n");
1220 return;
1221 }
1222
1223 priv = dev_get_drvdata(&cgdev->dev);
1224
1225 /* Try to extract channel from driver data. */
1226 if (priv->channel[READ]->cdev == cdev)
1227 ch = priv->channel[READ];
1228 else if (priv->channel[WRITE]->cdev == cdev)
1229 ch = priv->channel[WRITE];
1230 else {
1231 dev_err(&cdev->dev,
1232 "%s: Internal error: Can't determine channel for "
1233 "interrupt device %s\n",
1234 __func__, dev_name(&cdev->dev));
1235 /* Explain: inconsistent internal structures */
1236 return;
1237 }
1238
1239 dev = ch->netdev;
1240 if (dev == NULL) {
1241 dev_err(&cdev->dev,
1242 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1243 __func__, ch);
1244 /* Explain: inconsistent internal structures */
1245 return;
1246 }
1247
1248 /* Copy interruption response block. */
1249 memcpy(ch->irb, irb, sizeof(struct irb));
1250
1251 /* Issue error message and return on subchannel error code */
1252 if (irb->scsw.cmd.cstat) {
1253 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1254 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1255 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1256 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1257 dev_warn(&cdev->dev,
1258 "A check occurred on the subchannel\n");
1259 return;
1260 }
1261
1262 /* Check the reason-code of a unit check */
1263 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1264 if ((irb->ecw[0] & ch->sense_rc) == 0)
1265 /* print it only once */
1266 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1267 "%s(%s): sense=%02x, ds=%02x",
1268 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1269 ccw_unit_check(ch, irb->ecw[0]);
1270 return;
1271 }
1272 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1273 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1274 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1275 else
1276 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1277 return;
1278 }
1279 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1280 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1281 return;
1282 }
1283 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1284 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1285 (irb->scsw.cmd.stctl ==
1286 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1287 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1288 else
1289 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1290
1291 }
1292
1293 /**
1294 * Add ctcm specific attributes.
1295 * Add ctcm private data.
1296 *
1297 * cgdev pointer to ccwgroup_device just added
1298 *
1299 * returns 0 on success, !0 on failure.
1300 */
1301 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1302 {
1303 struct ctcm_priv *priv;
1304 int rc;
1305
1306 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1307 "%s %p",
1308 __func__, cgdev);
1309
1310 if (!get_device(&cgdev->dev))
1311 return -ENODEV;
1312
1313 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1314 if (!priv) {
1315 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1316 "%s: memory allocation failure",
1317 CTCM_FUNTAIL);
1318 put_device(&cgdev->dev);
1319 return -ENOMEM;
1320 }
1321
1322 rc = ctcm_add_files(&cgdev->dev);
1323 if (rc) {
1324 kfree(priv);
1325 put_device(&cgdev->dev);
1326 return rc;
1327 }
1328 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1329 cgdev->cdev[0]->handler = ctcm_irq_handler;
1330 cgdev->cdev[1]->handler = ctcm_irq_handler;
1331 dev_set_drvdata(&cgdev->dev, priv);
1332
1333 return 0;
1334 }
1335
1336 /**
1337 * Add a new channel to the list of channels.
1338 * Keeps the channel list sorted.
1339 *
1340 * cdev The ccw_device to be added.
1341 * type The type class of the new channel.
1342 * priv Points to the private data of the ccwgroup_device.
1343 *
1344 * returns 0 on success, !0 on error.
1345 */
1346 static int add_channel(struct ccw_device *cdev, enum channel_types type,
1347 struct ctcm_priv *priv)
1348 {
1349 struct channel **c = &channels;
1350 struct channel *ch;
1351 int ccw_num;
1352 int rc = 0;
1353
1354 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1355 "%s(%s), type %d, proto %d",
1356 __func__, dev_name(&cdev->dev), type, priv->protocol);
1357
1358 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1359 if (ch == NULL)
1360 return -ENOMEM;
1361
1362 ch->protocol = priv->protocol;
1363 if (IS_MPC(priv)) {
1364 ch->discontact_th = (struct th_header *)
1365 kzalloc(TH_HEADER_LENGTH, gfp_type());
1366 if (ch->discontact_th == NULL)
1367 goto nomem_return;
1368
1369 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1370 tasklet_init(&ch->ch_disc_tasklet,
1371 mpc_action_send_discontact, (unsigned long)ch);
1372
1373 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1374 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1375 ccw_num = 17;
1376 } else
1377 ccw_num = 8;
1378
1379 ch->ccw = (struct ccw1 *)
1380 kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1381 if (ch->ccw == NULL)
1382 goto nomem_return;
1383
1384 ch->cdev = cdev;
1385 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
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",
1471 __func__, (*c)->id);
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
1490 nomem_return:
1491 rc = -ENOMEM;
1492
1493 free_return: /* note that all channel pointers are 0 or valid */
1494 kfree(ch->ccw);
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 */
1505 static enum channel_types get_channel_type(struct ccw_device_id *id)
1506 {
1507 enum channel_types type;
1508 type = (enum channel_types)id->driver_info;
1509
1510 if (type == channel_type_ficon)
1511 type = channel_type_escon;
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 */
1524 static 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;
1529 enum channel_types type;
1530 struct ctcm_priv *priv;
1531 struct net_device *dev;
1532 struct ccw_device *cdev0;
1533 struct ccw_device *cdev1;
1534 int ret;
1535
1536 priv = dev_get_drvdata(&cgdev->dev);
1537 if (!priv)
1538 return -ENODEV;
1539
1540 cdev0 = cgdev->cdev[0];
1541 cdev1 = cgdev->cdev[1];
1542
1543 type = get_channel_type(&cdev0->id);
1544
1545 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1546 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1547
1548 ret = add_channel(cdev0, type, priv);
1549 if (ret)
1550 return ret;
1551 ret = add_channel(cdev1, type, priv);
1552 if (ret)
1553 return ret;
1554
1555 ret = ccw_device_set_online(cdev0);
1556 if (ret != 0) {
1557 /* may be ok to fail now - can be done later */
1558 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1559 "%s(%s) set_online rc=%d",
1560 CTCM_FUNTAIL, read_id, ret);
1561 }
1562
1563 ret = ccw_device_set_online(cdev1);
1564 if (ret != 0) {
1565 /* may be ok to fail now - can be done later */
1566 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1567 "%s(%s) set_online rc=%d",
1568 CTCM_FUNTAIL, write_id, ret);
1569 }
1570
1571 dev = ctcm_init_netdevice(priv);
1572 if (dev == NULL)
1573 goto out;
1574
1575 for (direction = READ; direction <= WRITE; direction++) {
1576 priv->channel[direction] =
1577 channel_get(type, direction == READ ? read_id : write_id,
1578 direction);
1579 if (priv->channel[direction] == NULL) {
1580 if (direction == WRITE)
1581 channel_free(priv->channel[READ]);
1582 goto out_dev;
1583 }
1584 priv->channel[direction]->netdev = dev;
1585 priv->channel[direction]->protocol = priv->protocol;
1586 priv->channel[direction]->max_bufsize = priv->buffer_size;
1587 }
1588 /* sysfs magic */
1589 SET_NETDEV_DEV(dev, &cgdev->dev);
1590
1591 if (register_netdev(dev))
1592 goto out_dev;
1593
1594 if (ctcm_add_attributes(&cgdev->dev)) {
1595 unregister_netdev(dev);
1596 goto out_dev;
1597 }
1598
1599 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1600
1601 dev_info(&dev->dev,
1602 "setup OK : r/w = %s/%s, protocol : %d\n",
1603 priv->channel[READ]->id,
1604 priv->channel[WRITE]->id, priv->protocol);
1605
1606 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1607 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1608 priv->channel[READ]->id,
1609 priv->channel[WRITE]->id, priv->protocol);
1610
1611 return 0;
1612 out_dev:
1613 ctcm_free_netdevice(dev);
1614 out:
1615 ccw_device_set_offline(cgdev->cdev[1]);
1616 ccw_device_set_offline(cgdev->cdev[0]);
1617
1618 return -ENODEV;
1619 }
1620
1621 /**
1622 * Shutdown an interface.
1623 *
1624 * cgdev Device to be shut down.
1625 *
1626 * returns 0 on success, !0 on failure.
1627 */
1628 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1629 {
1630 struct ctcm_priv *priv;
1631 struct net_device *dev;
1632
1633 priv = dev_get_drvdata(&cgdev->dev);
1634 if (!priv)
1635 return -ENODEV;
1636
1637 if (priv->channel[READ]) {
1638 dev = priv->channel[READ]->netdev;
1639 CTCM_DBF_DEV(SETUP, dev, "");
1640 /* Close the device */
1641 ctcm_close(dev);
1642 dev->flags &= ~IFF_RUNNING;
1643 ctcm_remove_attributes(&cgdev->dev);
1644 channel_free(priv->channel[READ]);
1645 } else
1646 dev = NULL;
1647
1648 if (priv->channel[WRITE])
1649 channel_free(priv->channel[WRITE]);
1650
1651 if (dev) {
1652 unregister_netdev(dev);
1653 ctcm_free_netdevice(dev);
1654 }
1655
1656 if (priv->fsm)
1657 kfree_fsm(priv->fsm);
1658
1659 ccw_device_set_offline(cgdev->cdev[1]);
1660 ccw_device_set_offline(cgdev->cdev[0]);
1661
1662 if (priv->channel[READ])
1663 channel_remove(priv->channel[READ]);
1664 if (priv->channel[WRITE])
1665 channel_remove(priv->channel[WRITE]);
1666 priv->channel[READ] = priv->channel[WRITE] = NULL;
1667
1668 return 0;
1669
1670 }
1671
1672
1673 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1674 {
1675 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1676
1677 BUG_ON(priv == NULL);
1678
1679 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1680 "removing device %p, proto : %d",
1681 cgdev, priv->protocol);
1682
1683 if (cgdev->state == CCWGROUP_ONLINE)
1684 ctcm_shutdown_device(cgdev);
1685 ctcm_remove_files(&cgdev->dev);
1686 dev_set_drvdata(&cgdev->dev, NULL);
1687 kfree(priv);
1688 put_device(&cgdev->dev);
1689 }
1690
1691 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1692 {
1693 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1694
1695 if (gdev->state == CCWGROUP_OFFLINE)
1696 return 0;
1697 netif_device_detach(priv->channel[READ]->netdev);
1698 ctcm_close(priv->channel[READ]->netdev);
1699 ccw_device_set_offline(gdev->cdev[1]);
1700 ccw_device_set_offline(gdev->cdev[0]);
1701 return 0;
1702 }
1703
1704 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1705 {
1706 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1707 int rc;
1708
1709 if (gdev->state == CCWGROUP_OFFLINE)
1710 return 0;
1711 rc = ccw_device_set_online(gdev->cdev[1]);
1712 if (rc)
1713 goto err_out;
1714 rc = ccw_device_set_online(gdev->cdev[0]);
1715 if (rc)
1716 goto err_out;
1717 ctcm_open(priv->channel[READ]->netdev);
1718 err_out:
1719 netif_device_attach(priv->channel[READ]->netdev);
1720 return rc;
1721 }
1722
1723 static struct ccwgroup_driver ctcm_group_driver = {
1724 .owner = THIS_MODULE,
1725 .name = CTC_DRIVER_NAME,
1726 .max_slaves = 2,
1727 .driver_id = 0xC3E3C3D4, /* CTCM */
1728 .probe = ctcm_probe_device,
1729 .remove = ctcm_remove_device,
1730 .set_online = ctcm_new_device,
1731 .set_offline = ctcm_shutdown_device,
1732 .freeze = ctcm_pm_suspend,
1733 .thaw = ctcm_pm_resume,
1734 .restore = ctcm_pm_resume,
1735 };
1736
1737
1738 /*
1739 * Module related routines
1740 */
1741
1742 /*
1743 * Prepare to be unloaded. Free IRQ's and release all resources.
1744 * This is called just before this module is unloaded. It is
1745 * not called, if the usage count is !0, so we don't need to check
1746 * for that.
1747 */
1748 static void __exit ctcm_exit(void)
1749 {
1750 unregister_cu3088_discipline(&ctcm_group_driver);
1751 ctcm_unregister_dbf_views();
1752 pr_info("CTCM driver unloaded\n");
1753 }
1754
1755 /*
1756 * Print Banner.
1757 */
1758 static void print_banner(void)
1759 {
1760 pr_info("CTCM driver initialized\n");
1761 }
1762
1763 /**
1764 * Initialize module.
1765 * This is called just after the module is loaded.
1766 *
1767 * returns 0 on success, !0 on error.
1768 */
1769 static int __init ctcm_init(void)
1770 {
1771 int ret;
1772
1773 channels = NULL;
1774
1775 ret = ctcm_register_dbf_views();
1776 if (ret) {
1777 return ret;
1778 }
1779 ret = register_cu3088_discipline(&ctcm_group_driver);
1780 if (ret) {
1781 ctcm_unregister_dbf_views();
1782 pr_err("%s / register_cu3088_discipline failed, ret = %d\n",
1783 __func__, ret);
1784 return ret;
1785 }
1786 print_banner();
1787 return ret;
1788 }
1789
1790 module_init(ctcm_init);
1791 module_exit(ctcm_exit);
1792
1793 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1794 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1795 MODULE_LICENSE("GPL");
1796
Linus' kernel tree