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1/*
2 * drivers/s390/net/ctcm_main.c
3 *
4 * Copyright IBM Corp. 2001, 2009
5 * Author(s):
6 * Original CTC driver(s):
7 * Fritz Elfert (felfert@millenux.com)
8 * Dieter Wellerdiek (wel@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 * Denis Joseph Barrow (barrow_dj@yahoo.com)
11 * Jochen Roehrig (roehrig@de.ibm.com)
12 * Cornelia Huck <cornelia.huck@de.ibm.com>
13 * MPC additions:
14 * Belinda Thompson (belindat@us.ibm.com)
15 * Andy Richter (richtera@us.ibm.com)
16 * Revived by:
17 * Peter Tiedemann (ptiedem@de.ibm.com)
18 */
19
20#undef DEBUG
21#undef DEBUGDATA
22#undef DEBUGCCW
23
24#define KMSG_COMPONENT "ctcm"
25#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26
27#include <linux/kernel_stat.h>
28#include <linux/module.h>
29#include <linux/init.h>
30#include <linux/kernel.h>
31#include <linux/slab.h>
32#include <linux/errno.h>
33#include <linux/types.h>
34#include <linux/interrupt.h>
35#include <linux/timer.h>
36#include <linux/bitops.h>
37
38#include <linux/signal.h>
39#include <linux/string.h>
40
41#include <linux/ip.h>
42#include <linux/if_arp.h>
43#include <linux/tcp.h>
44#include <linux/skbuff.h>
45#include <linux/ctype.h>
46#include <net/dst.h>
47
48#include <linux/io.h>
49#include <asm/ccwdev.h>
50#include <asm/ccwgroup.h>
51#include <linux/uaccess.h>
52
53#include <asm/idals.h>
54
55#include "ctcm_fsms.h"
56#include "ctcm_main.h"
57
58/* Some common global variables */
59
60/**
61 * The root device for ctcm group devices
62 */
63static struct device *ctcm_root_dev;
64
65/*
66 * Linked list of all detected channels.
67 */
68struct channel *channels;
69
70/**
71 * Unpack a just received skb and hand it over to
72 * upper layers.
73 *
74 * ch The channel where this skb has been received.
75 * pskb The received skb.
76 */
77void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
78{
79 struct net_device *dev = ch->netdev;
80 struct ctcm_priv *priv = dev->ml_priv;
81 __u16 len = *((__u16 *) pskb->data);
82
83 skb_put(pskb, 2 + LL_HEADER_LENGTH);
84 skb_pull(pskb, 2);
85 pskb->dev = dev;
86 pskb->ip_summed = CHECKSUM_UNNECESSARY;
87 while (len > 0) {
88 struct sk_buff *skb;
89 int skblen;
90 struct ll_header *header = (struct ll_header *)pskb->data;
91
92 skb_pull(pskb, LL_HEADER_LENGTH);
93 if ((ch->protocol == CTCM_PROTO_S390) &&
94 (header->type != ETH_P_IP)) {
95 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
96 ch->logflags |= LOG_FLAG_ILLEGALPKT;
97 /*
98 * Check packet type only if we stick strictly
99 * to S/390's protocol of OS390. This only
100 * supports IP. Otherwise allow any packet
101 * type.
102 */
103 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
104 "%s(%s): Illegal packet type 0x%04x"
105 " - dropping",
106 CTCM_FUNTAIL, dev->name, header->type);
107 }
108 priv->stats.rx_dropped++;
109 priv->stats.rx_frame_errors++;
110 return;
111 }
112 pskb->protocol = ntohs(header->type);
113 if ((header->length <= LL_HEADER_LENGTH) ||
114 (len <= LL_HEADER_LENGTH)) {
115 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
116 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
117 "%s(%s): Illegal packet size %d(%d,%d)"
118 "- dropping",
119 CTCM_FUNTAIL, dev->name,
120 header->length, dev->mtu, len);
121 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
122 }
123
124 priv->stats.rx_dropped++;
125 priv->stats.rx_length_errors++;
126 return;
127 }
128 header->length -= LL_HEADER_LENGTH;
129 len -= LL_HEADER_LENGTH;
130 if ((header->length > skb_tailroom(pskb)) ||
131 (header->length > len)) {
132 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
133 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
134 "%s(%s): Packet size %d (overrun)"
135 " - dropping", CTCM_FUNTAIL,
136 dev->name, header->length);
137 ch->logflags |= LOG_FLAG_OVERRUN;
138 }
139
140 priv->stats.rx_dropped++;
141 priv->stats.rx_length_errors++;
142 return;
143 }
144 skb_put(pskb, header->length);
145 skb_reset_mac_header(pskb);
146 len -= header->length;
147 skb = dev_alloc_skb(pskb->len);
148 if (!skb) {
149 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
150 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
151 "%s(%s): MEMORY allocation error",
152 CTCM_FUNTAIL, dev->name);
153 ch->logflags |= LOG_FLAG_NOMEM;
154 }
155 priv->stats.rx_dropped++;
156 return;
157 }
158 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
159 pskb->len);
160 skb_reset_mac_header(skb);
161 skb->dev = pskb->dev;
162 skb->protocol = pskb->protocol;
163 pskb->ip_summed = CHECKSUM_UNNECESSARY;
164 skblen = skb->len;
165 /*
166 * reset logflags
167 */
168 ch->logflags = 0;
169 priv->stats.rx_packets++;
170 priv->stats.rx_bytes += skblen;
171 netif_rx_ni(skb);
172 if (len > 0) {
173 skb_pull(pskb, header->length);
174 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
175 CTCM_DBF_DEV_NAME(TRACE, dev,
176 "Overrun in ctcm_unpack_skb");
177 ch->logflags |= LOG_FLAG_OVERRUN;
178 return;
179 }
180 skb_put(pskb, LL_HEADER_LENGTH);
181 }
182 }
183}
184
185/**
186 * Release a specific channel in the channel list.
187 *
188 * ch Pointer to channel struct to be released.
189 */
190static void channel_free(struct channel *ch)
191{
192 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
193 ch->flags &= ~CHANNEL_FLAGS_INUSE;
194 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
195}
196
197/**
198 * Remove a specific channel in the channel list.
199 *
200 * ch Pointer to channel struct to be released.
201 */
202static void channel_remove(struct channel *ch)
203{
204 struct channel **c = &channels;
205 char chid[CTCM_ID_SIZE+1];
206 int ok = 0;
207
208 if (ch == NULL)
209 return;
210 else
211 strncpy(chid, ch->id, CTCM_ID_SIZE);
212
213 channel_free(ch);
214 while (*c) {
215 if (*c == ch) {
216 *c = ch->next;
217 fsm_deltimer(&ch->timer);
218 if (IS_MPC(ch))
219 fsm_deltimer(&ch->sweep_timer);
220
221 kfree_fsm(ch->fsm);
222 clear_normalized_cda(&ch->ccw[4]);
223 if (ch->trans_skb != NULL) {
224 clear_normalized_cda(&ch->ccw[1]);
225 dev_kfree_skb_any(ch->trans_skb);
226 }
227 if (IS_MPC(ch)) {
228 tasklet_kill(&ch->ch_tasklet);
229 tasklet_kill(&ch->ch_disc_tasklet);
230 kfree(ch->discontact_th);
231 }
232 kfree(ch->ccw);
233 kfree(ch->irb);
234 kfree(ch);
235 ok = 1;
236 break;
237 }
238 c = &((*c)->next);
239 }
240
241 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
242 chid, ok ? "OK" : "failed");
243}
244
245/**
246 * Get a specific channel from the channel list.
247 *
248 * type Type of channel we are interested in.
249 * id Id of channel we are interested in.
250 * direction Direction we want to use this channel for.
251 *
252 * returns Pointer to a channel or NULL if no matching channel available.
253 */
254static struct channel *channel_get(enum ctcm_channel_types type,
255 char *id, int direction)
256{
257 struct channel *ch = channels;
258
259 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
260 ch = ch->next;
261 if (!ch) {
262 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
263 "%s(%d, %s, %d) not found in channel list\n",
264 CTCM_FUNTAIL, type, id, direction);
265 } else {
266 if (ch->flags & CHANNEL_FLAGS_INUSE)
267 ch = NULL;
268 else {
269 ch->flags |= CHANNEL_FLAGS_INUSE;
270 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
271 ch->flags |= (direction == CTCM_WRITE)
272 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
273 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
274 }
275 }
276 return ch;
277}
278
279static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
280{
281 if (!IS_ERR(irb))
282 return 0;
283
284 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
285 "irb error %ld on device %s\n",
286 PTR_ERR(irb), dev_name(&cdev->dev));
287
288 switch (PTR_ERR(irb)) {
289 case -EIO:
290 dev_err(&cdev->dev,
291 "An I/O-error occurred on the CTCM device\n");
292 break;
293 case -ETIMEDOUT:
294 dev_err(&cdev->dev,
295 "An adapter hardware operation timed out\n");
296 break;
297 default:
298 dev_err(&cdev->dev,
299 "An error occurred on the adapter hardware\n");
300 }
301 return PTR_ERR(irb);
302}
303
304
305/**
306 * Check sense of a unit check.
307 *
308 * ch The channel, the sense code belongs to.
309 * sense The sense code to inspect.
310 */
311static inline void ccw_unit_check(struct channel *ch, __u8 sense)
312{
313 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
314 "%s(%s): %02x",
315 CTCM_FUNTAIL, ch->id, sense);
316
317 if (sense & SNS0_INTERVENTION_REQ) {
318 if (sense & 0x01) {
319 if (ch->sense_rc != 0x01) {
320 pr_notice(
321 "%s: The communication peer has "
322 "disconnected\n", ch->id);
323 ch->sense_rc = 0x01;
324 }
325 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
326 } else {
327 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
328 pr_notice(
329 "%s: The remote operating system is "
330 "not available\n", ch->id);
331 ch->sense_rc = SNS0_INTERVENTION_REQ;
332 }
333 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
334 }
335 } else if (sense & SNS0_EQUIPMENT_CHECK) {
336 if (sense & SNS0_BUS_OUT_CHECK) {
337 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
338 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
339 "%s(%s): remote HW error %02x",
340 CTCM_FUNTAIL, ch->id, sense);
341 ch->sense_rc = SNS0_BUS_OUT_CHECK;
342 }
343 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
344 } else {
345 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
346 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
347 "%s(%s): remote read parity error %02x",
348 CTCM_FUNTAIL, ch->id, sense);
349 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
350 }
351 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
352 }
353 } else if (sense & SNS0_BUS_OUT_CHECK) {
354 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
355 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
356 "%s(%s): BUS OUT error %02x",
357 CTCM_FUNTAIL, ch->id, sense);
358 ch->sense_rc = SNS0_BUS_OUT_CHECK;
359 }
360 if (sense & 0x04) /* data-streaming timeout */
361 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
362 else /* Data-transfer parity error */
363 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
364 } else if (sense & SNS0_CMD_REJECT) {
365 if (ch->sense_rc != SNS0_CMD_REJECT) {
366 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
367 "%s(%s): Command rejected",
368 CTCM_FUNTAIL, ch->id);
369 ch->sense_rc = SNS0_CMD_REJECT;
370 }
371 } else if (sense == 0) {
372 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
373 "%s(%s): Unit check ZERO",
374 CTCM_FUNTAIL, ch->id);
375 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
376 } else {
377 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
378 "%s(%s): Unit check code %02x unknown",
379 CTCM_FUNTAIL, ch->id, sense);
380 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
381 }
382}
383
384int ctcm_ch_alloc_buffer(struct channel *ch)
385{
386 clear_normalized_cda(&ch->ccw[1]);
387 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
388 if (ch->trans_skb == NULL) {
389 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
390 "%s(%s): %s trans_skb allocation error",
391 CTCM_FUNTAIL, ch->id,
392 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
393 "RX" : "TX");
394 return -ENOMEM;
395 }
396
397 ch->ccw[1].count = ch->max_bufsize;
398 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
399 dev_kfree_skb(ch->trans_skb);
400 ch->trans_skb = NULL;
401 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
402 "%s(%s): %s set norm_cda failed",
403 CTCM_FUNTAIL, ch->id,
404 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
405 "RX" : "TX");
406 return -ENOMEM;
407 }
408
409 ch->ccw[1].count = 0;
410 ch->trans_skb_data = ch->trans_skb->data;
411 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
412 return 0;
413}
414
415/*
416 * Interface API for upper network layers
417 */
418
419/**
420 * Open an interface.
421 * Called from generic network layer when ifconfig up is run.
422 *
423 * dev Pointer to interface struct.
424 *
425 * returns 0 on success, -ERRNO on failure. (Never fails.)
426 */
427int ctcm_open(struct net_device *dev)
428{
429 struct ctcm_priv *priv = dev->ml_priv;
430
431 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
432 if (!IS_MPC(priv))
433 fsm_event(priv->fsm, DEV_EVENT_START, dev);
434 return 0;
435}
436
437/**
438 * Close an interface.
439 * Called from generic network layer when ifconfig down is run.
440 *
441 * dev Pointer to interface struct.
442 *
443 * returns 0 on success, -ERRNO on failure. (Never fails.)
444 */
445int ctcm_close(struct net_device *dev)
446{
447 struct ctcm_priv *priv = dev->ml_priv;
448
449 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
450 if (!IS_MPC(priv))
451 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
452 return 0;
453}
454
455
456/**
457 * Transmit a packet.
458 * This is a helper function for ctcm_tx().
459 *
460 * ch Channel to be used for sending.
461 * skb Pointer to struct sk_buff of packet to send.
462 * The linklevel header has already been set up
463 * by ctcm_tx().
464 *
465 * returns 0 on success, -ERRNO on failure. (Never fails.)
466 */
467static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
468{
469 unsigned long saveflags;
470 struct ll_header header;
471 int rc = 0;
472 __u16 block_len;
473 int ccw_idx;
474 struct sk_buff *nskb;
475 unsigned long hi;
476
477 /* we need to acquire the lock for testing the state
478 * otherwise we can have an IRQ changing the state to
479 * TXIDLE after the test but before acquiring the lock.
480 */
481 spin_lock_irqsave(&ch->collect_lock, saveflags);
482 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
483 int l = skb->len + LL_HEADER_LENGTH;
484
485 if (ch->collect_len + l > ch->max_bufsize - 2) {
486 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
487 return -EBUSY;
488 } else {
489 atomic_inc(&skb->users);
490 header.length = l;
491 header.type = skb->protocol;
492 header.unused = 0;
493 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
494 LL_HEADER_LENGTH);
495 skb_queue_tail(&ch->collect_queue, skb);
496 ch->collect_len += l;
497 }
498 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
499 goto done;
500 }
501 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
502 /*
503 * Protect skb against beeing free'd by upper
504 * layers.
505 */
506 atomic_inc(&skb->users);
507 ch->prof.txlen += skb->len;
508 header.length = skb->len + LL_HEADER_LENGTH;
509 header.type = skb->protocol;
510 header.unused = 0;
511 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
512 block_len = skb->len + 2;
513 *((__u16 *)skb_push(skb, 2)) = block_len;
514
515 /*
516 * IDAL support in CTCM is broken, so we have to
517 * care about skb's above 2G ourselves.
518 */
519 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
520 if (hi) {
521 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
522 if (!nskb) {
523 atomic_dec(&skb->users);
524 skb_pull(skb, LL_HEADER_LENGTH + 2);
525 ctcm_clear_busy(ch->netdev);
526 return -ENOMEM;
527 } else {
528 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
529 atomic_inc(&nskb->users);
530 atomic_dec(&skb->users);
531 dev_kfree_skb_irq(skb);
532 skb = nskb;
533 }
534 }
535
536 ch->ccw[4].count = block_len;
537 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
538 /*
539 * idal allocation failed, try via copying to
540 * trans_skb. trans_skb usually has a pre-allocated
541 * idal.
542 */
543 if (ctcm_checkalloc_buffer(ch)) {
544 /*
545 * Remove our header. It gets added
546 * again on retransmit.
547 */
548 atomic_dec(&skb->users);
549 skb_pull(skb, LL_HEADER_LENGTH + 2);
550 ctcm_clear_busy(ch->netdev);
551 return -ENOMEM;
552 }
553
554 skb_reset_tail_pointer(ch->trans_skb);
555 ch->trans_skb->len = 0;
556 ch->ccw[1].count = skb->len;
557 skb_copy_from_linear_data(skb,
558 skb_put(ch->trans_skb, skb->len), skb->len);
559 atomic_dec(&skb->users);
560 dev_kfree_skb_irq(skb);
561 ccw_idx = 0;
562 } else {
563 skb_queue_tail(&ch->io_queue, skb);
564 ccw_idx = 3;
565 }
566 ch->retry = 0;
567 fsm_newstate(ch->fsm, CTC_STATE_TX);
568 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
569 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
570 ch->prof.send_stamp = current_kernel_time(); /* xtime */
571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572 (unsigned long)ch, 0xff, 0);
573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574 if (ccw_idx == 3)
575 ch->prof.doios_single++;
576 if (rc != 0) {
577 fsm_deltimer(&ch->timer);
578 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579 if (ccw_idx == 3)
580 skb_dequeue_tail(&ch->io_queue);
581 /*
582 * Remove our header. It gets added
583 * again on retransmit.
584 */
585 skb_pull(skb, LL_HEADER_LENGTH + 2);
586 } else if (ccw_idx == 0) {
587 struct net_device *dev = ch->netdev;
588 struct ctcm_priv *priv = dev->ml_priv;
589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
592done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595}
596
597static void ctcmpc_send_sweep_req(struct channel *rch)
598{
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
605 /* int rc = 0; */
606
607 priv = dev->ml_priv;
608 grp = priv->mpcg;
609 ch = priv->channel[CTCM_WRITE];
610
611 /* sweep processing is not complete until response and request */
612 /* has completed for all read channels in group */
613 if (grp->in_sweep == 0) {
614 grp->in_sweep = 1;
615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
622 /* rc = -ENOMEM; */
623 goto nomem;
624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 dev->trans_start = jiffies;
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
652nomem:
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 */
663static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664{
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
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 (skb->protocol == ntohs(ETH_P_SNAP)) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
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 (skb->protocol == ntohs(ETH_P_SNAP)) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
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 = current_kernel_time(); /* xtime */
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
850 ctcmpc_send_sweep_req(ch);
851
852 goto done;
853nomem_exit:
854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855 "%s(%s): MEMORY allocation ERROR\n",
856 CTCM_FUNTAIL, ch->id);
857 rc = -ENOMEM;
858 atomic_dec(&skb->users);
859 dev_kfree_skb_any(skb);
860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
861done:
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 */
878static 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 dev->trans_start = jiffies;
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 */
921static 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 dev->trans_start = jiffies;
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);
1011done:
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 */
1030static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031{
1032 struct ctcm_priv *priv;
1033 int max_bufsize;
1034
1035 if (new_mtu < 576 || new_mtu > 65527)
1036 return -EINVAL;
1037
1038 priv = dev->ml_priv;
1039 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1040
1041 if (IS_MPC(priv)) {
1042 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043 return -EINVAL;
1044 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045 } else {
1046 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047 return -EINVAL;
1048 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049 }
1050 dev->mtu = new_mtu;
1051 return 0;
1052}
1053
1054/**
1055 * Returns interface statistics of a device.
1056 *
1057 * dev Pointer to interface struct.
1058 *
1059 * returns Pointer to stats struct of this interface.
1060 */
1061static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062{
1063 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1064}
1065
1066static void ctcm_free_netdevice(struct net_device *dev)
1067{
1068 struct ctcm_priv *priv;
1069 struct mpc_group *grp;
1070
1071 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072 "%s(%s)", CTCM_FUNTAIL, dev->name);
1073 priv = dev->ml_priv;
1074 if (priv) {
1075 grp = priv->mpcg;
1076 if (grp) {
1077 if (grp->fsm)
1078 kfree_fsm(grp->fsm);
1079 if (grp->xid_skb)
1080 dev_kfree_skb(grp->xid_skb);
1081 if (grp->rcvd_xid_skb)
1082 dev_kfree_skb(grp->rcvd_xid_skb);
1083 tasklet_kill(&grp->mpc_tasklet2);
1084 kfree(grp);
1085 priv->mpcg = NULL;
1086 }
1087 if (priv->fsm) {
1088 kfree_fsm(priv->fsm);
1089 priv->fsm = NULL;
1090 }
1091 kfree(priv->xid);
1092 priv->xid = NULL;
1093 /*
1094 * Note: kfree(priv); is done in "opposite" function of
1095 * allocator function probe_device which is remove_device.
1096 */
1097 }
1098#ifdef MODULE
1099 free_netdev(dev);
1100#endif
1101}
1102
1103struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
1105static const struct net_device_ops ctcm_netdev_ops = {
1106 .ndo_open = ctcm_open,
1107 .ndo_stop = ctcm_close,
1108 .ndo_get_stats = ctcm_stats,
1109 .ndo_change_mtu = ctcm_change_mtu,
1110 .ndo_start_xmit = ctcm_tx,
1111};
1112
1113static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114 .ndo_open = ctcm_open,
1115 .ndo_stop = ctcm_close,
1116 .ndo_get_stats = ctcm_stats,
1117 .ndo_change_mtu = ctcm_change_mtu,
1118 .ndo_start_xmit = ctcmpc_tx,
1119};
1120
1121void static ctcm_dev_setup(struct net_device *dev)
1122{
1123 dev->type = ARPHRD_SLIP;
1124 dev->tx_queue_len = 100;
1125 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126}
1127
1128/*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133{
1134 struct net_device *dev;
1135 struct mpc_group *grp;
1136 if (!priv)
1137 return NULL;
1138
1139 if (IS_MPC(priv))
1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1141 else
1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1143
1144 if (!dev) {
1145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1146 "%s: MEMORY allocation ERROR",
1147 CTCM_FUNTAIL);
1148 return NULL;
1149 }
1150 dev->ml_priv = priv;
1151 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1152 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1153 dev_fsm, dev_fsm_len, GFP_KERNEL);
1154 if (priv->fsm == NULL) {
1155 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1156 free_netdev(dev);
1157 return NULL;
1158 }
1159 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1160 fsm_settimer(priv->fsm, &priv->restart_timer);
1161
1162 if (IS_MPC(priv)) {
1163 /* MPC Group Initializations */
1164 grp = ctcmpc_init_mpc_group(priv);
1165 if (grp == NULL) {
1166 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1167 free_netdev(dev);
1168 return NULL;
1169 }
1170 tasklet_init(&grp->mpc_tasklet2,
1171 mpc_group_ready, (unsigned long)dev);
1172 dev->mtu = MPC_BUFSIZE_DEFAULT -
1173 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1174
1175 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1176 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1177 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1178 } else {
1179 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1180 dev->netdev_ops = &ctcm_netdev_ops;
1181 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1182 }
1183
1184 CTCMY_DBF_DEV(SETUP, dev, "finished");
1185
1186 return dev;
1187}
1188
1189/**
1190 * Main IRQ handler.
1191 *
1192 * cdev The ccw_device the interrupt is for.
1193 * intparm interruption parameter.
1194 * irb interruption response block.
1195 */
1196static void ctcm_irq_handler(struct ccw_device *cdev,
1197 unsigned long intparm, struct irb *irb)
1198{
1199 struct channel *ch;
1200 struct net_device *dev;
1201 struct ctcm_priv *priv;
1202 struct ccwgroup_device *cgdev;
1203 int cstat;
1204 int dstat;
1205
1206 kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
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/**
1299 * Add ctcm specific attributes.
1300 * Add ctcm private data.
1301 *
1302 * cgdev pointer to ccwgroup_device just added
1303 *
1304 * returns 0 on success, !0 on failure.
1305 */
1306static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1307{
1308 struct ctcm_priv *priv;
1309 int rc;
1310
1311 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1312 "%s %p",
1313 __func__, cgdev);
1314
1315 if (!get_device(&cgdev->dev))
1316 return -ENODEV;
1317
1318 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1319 if (!priv) {
1320 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1321 "%s: memory allocation failure",
1322 CTCM_FUNTAIL);
1323 put_device(&cgdev->dev);
1324 return -ENOMEM;
1325 }
1326
1327 rc = ctcm_add_files(&cgdev->dev);
1328 if (rc) {
1329 kfree(priv);
1330 put_device(&cgdev->dev);
1331 return rc;
1332 }
1333 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1334 cgdev->cdev[0]->handler = ctcm_irq_handler;
1335 cgdev->cdev[1]->handler = ctcm_irq_handler;
1336 dev_set_drvdata(&cgdev->dev, priv);
1337
1338 return 0;
1339}
1340
1341/**
1342 * Add a new channel to the list of channels.
1343 * Keeps the channel list sorted.
1344 *
1345 * cdev The ccw_device to be added.
1346 * type The type class of the new channel.
1347 * priv Points to the private data of the ccwgroup_device.
1348 *
1349 * returns 0 on success, !0 on error.
1350 */
1351static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1352 struct ctcm_priv *priv)
1353{
1354 struct channel **c = &channels;
1355 struct channel *ch;
1356 int ccw_num;
1357 int rc = 0;
1358
1359 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1360 "%s(%s), type %d, proto %d",
1361 __func__, dev_name(&cdev->dev), type, priv->protocol);
1362
1363 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1364 if (ch == NULL)
1365 return -ENOMEM;
1366
1367 ch->protocol = priv->protocol;
1368 if (IS_MPC(priv)) {
1369 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1370 if (ch->discontact_th == NULL)
1371 goto nomem_return;
1372
1373 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1374 tasklet_init(&ch->ch_disc_tasklet,
1375 mpc_action_send_discontact, (unsigned long)ch);
1376
1377 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1378 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1379 ccw_num = 17;
1380 } else
1381 ccw_num = 8;
1382
1383 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1384 if (ch->ccw == NULL)
1385 goto nomem_return;
1386
1387 ch->cdev = cdev;
1388 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1389 ch->type = type;
1390
1391 /**
1392 * "static" ccws are used in the following way:
1393 *
1394 * ccw[0..2] (Channel program for generic I/O):
1395 * 0: prepare
1396 * 1: read or write (depending on direction) with fixed
1397 * buffer (idal allocated once when buffer is allocated)
1398 * 2: nop
1399 * ccw[3..5] (Channel program for direct write of packets)
1400 * 3: prepare
1401 * 4: write (idal allocated on every write).
1402 * 5: nop
1403 * ccw[6..7] (Channel program for initial channel setup):
1404 * 6: set extended mode
1405 * 7: nop
1406 *
1407 * ch->ccw[0..5] are initialized in ch_action_start because
1408 * the channel's direction is yet unknown here.
1409 *
1410 * ccws used for xid2 negotiations
1411 * ch-ccw[8-14] need to be used for the XID exchange either
1412 * X side XID2 Processing
1413 * 8: write control
1414 * 9: write th
1415 * 10: write XID
1416 * 11: read th from secondary
1417 * 12: read XID from secondary
1418 * 13: read 4 byte ID
1419 * 14: nop
1420 * Y side XID Processing
1421 * 8: sense
1422 * 9: read th
1423 * 10: read XID
1424 * 11: write th
1425 * 12: write XID
1426 * 13: write 4 byte ID
1427 * 14: nop
1428 *
1429 * ccws used for double noop due to VM timing issues
1430 * which result in unrecoverable Busy on channel
1431 * 15: nop
1432 * 16: nop
1433 */
1434 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1435 ch->ccw[6].flags = CCW_FLAG_SLI;
1436
1437 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1438 ch->ccw[7].flags = CCW_FLAG_SLI;
1439
1440 if (IS_MPC(priv)) {
1441 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1442 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1443 ch->ccw[15].count = TH_HEADER_LENGTH;
1444 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1445
1446 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1447 ch->ccw[16].flags = CCW_FLAG_SLI;
1448
1449 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1450 ctc_ch_event_names, CTC_MPC_NR_STATES,
1451 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1452 mpc_ch_fsm_len, GFP_KERNEL);
1453 } else {
1454 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1455 ctc_ch_event_names, CTC_NR_STATES,
1456 CTC_NR_EVENTS, ch_fsm,
1457 ch_fsm_len, GFP_KERNEL);
1458 }
1459 if (ch->fsm == NULL)
1460 goto free_return;
1461
1462 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1463
1464 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1465 if (ch->irb == NULL)
1466 goto nomem_return;
1467
1468 while (*c && ctcm_less_than((*c)->id, ch->id))
1469 c = &(*c)->next;
1470
1471 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1472 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1473 "%s (%s) already in list, using old entry",
1474 __func__, (*c)->id);
1475
1476 goto free_return;
1477 }
1478
1479 spin_lock_init(&ch->collect_lock);
1480
1481 fsm_settimer(ch->fsm, &ch->timer);
1482 skb_queue_head_init(&ch->io_queue);
1483 skb_queue_head_init(&ch->collect_queue);
1484
1485 if (IS_MPC(priv)) {
1486 fsm_settimer(ch->fsm, &ch->sweep_timer);
1487 skb_queue_head_init(&ch->sweep_queue);
1488 }
1489 ch->next = *c;
1490 *c = ch;
1491 return 0;
1492
1493nomem_return:
1494 rc = -ENOMEM;
1495
1496free_return: /* note that all channel pointers are 0 or valid */
1497 kfree(ch->ccw);
1498 kfree(ch->discontact_th);
1499 kfree_fsm(ch->fsm);
1500 kfree(ch->irb);
1501 kfree(ch);
1502 return rc;
1503}
1504
1505/*
1506 * Return type of a detected device.
1507 */
1508static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1509{
1510 enum ctcm_channel_types type;
1511 type = (enum ctcm_channel_types)id->driver_info;
1512
1513 if (type == ctcm_channel_type_ficon)
1514 type = ctcm_channel_type_escon;
1515
1516 return type;
1517}
1518
1519/**
1520 *
1521 * Setup an interface.
1522 *
1523 * cgdev Device to be setup.
1524 *
1525 * returns 0 on success, !0 on failure.
1526 */
1527static int ctcm_new_device(struct ccwgroup_device *cgdev)
1528{
1529 char read_id[CTCM_ID_SIZE];
1530 char write_id[CTCM_ID_SIZE];
1531 int direction;
1532 enum ctcm_channel_types type;
1533 struct ctcm_priv *priv;
1534 struct net_device *dev;
1535 struct ccw_device *cdev0;
1536 struct ccw_device *cdev1;
1537 struct channel *readc;
1538 struct channel *writec;
1539 int ret;
1540 int result;
1541
1542 priv = dev_get_drvdata(&cgdev->dev);
1543 if (!priv) {
1544 result = -ENODEV;
1545 goto out_err_result;
1546 }
1547
1548 cdev0 = cgdev->cdev[0];
1549 cdev1 = cgdev->cdev[1];
1550
1551 type = get_channel_type(&cdev0->id);
1552
1553 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1554 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1555
1556 ret = add_channel(cdev0, type, priv);
1557 if (ret) {
1558 result = ret;
1559 goto out_err_result;
1560 }
1561 ret = add_channel(cdev1, type, priv);
1562 if (ret) {
1563 result = ret;
1564 goto out_remove_channel1;
1565 }
1566
1567 ret = ccw_device_set_online(cdev0);
1568 if (ret != 0) {
1569 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1570 "%s(%s) set_online rc=%d",
1571 CTCM_FUNTAIL, read_id, ret);
1572 result = -EIO;
1573 goto out_remove_channel2;
1574 }
1575
1576 ret = ccw_device_set_online(cdev1);
1577 if (ret != 0) {
1578 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1579 "%s(%s) set_online rc=%d",
1580 CTCM_FUNTAIL, write_id, ret);
1581
1582 result = -EIO;
1583 goto out_ccw1;
1584 }
1585
1586 dev = ctcm_init_netdevice(priv);
1587 if (dev == NULL) {
1588 result = -ENODEV;
1589 goto out_ccw2;
1590 }
1591
1592 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1593 priv->channel[direction] =
1594 channel_get(type, direction == CTCM_READ ?
1595 read_id : write_id, direction);
1596 if (priv->channel[direction] == NULL) {
1597 if (direction == CTCM_WRITE)
1598 channel_free(priv->channel[CTCM_READ]);
1599 goto out_dev;
1600 }
1601 priv->channel[direction]->netdev = dev;
1602 priv->channel[direction]->protocol = priv->protocol;
1603 priv->channel[direction]->max_bufsize = priv->buffer_size;
1604 }
1605 /* sysfs magic */
1606 SET_NETDEV_DEV(dev, &cgdev->dev);
1607
1608 if (register_netdev(dev)) {
1609 result = -ENODEV;
1610 goto out_dev;
1611 }
1612
1613 if (ctcm_add_attributes(&cgdev->dev)) {
1614 result = -ENODEV;
1615 goto out_unregister;
1616 }
1617
1618 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1619
1620 dev_info(&dev->dev,
1621 "setup OK : r/w = %s/%s, protocol : %d\n",
1622 priv->channel[CTCM_READ]->id,
1623 priv->channel[CTCM_WRITE]->id, priv->protocol);
1624
1625 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1626 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1627 priv->channel[CTCM_READ]->id,
1628 priv->channel[CTCM_WRITE]->id, priv->protocol);
1629
1630 return 0;
1631out_unregister:
1632 unregister_netdev(dev);
1633out_dev:
1634 ctcm_free_netdevice(dev);
1635out_ccw2:
1636 ccw_device_set_offline(cgdev->cdev[1]);
1637out_ccw1:
1638 ccw_device_set_offline(cgdev->cdev[0]);
1639out_remove_channel2:
1640 readc = channel_get(type, read_id, CTCM_READ);
1641 channel_remove(readc);
1642out_remove_channel1:
1643 writec = channel_get(type, write_id, CTCM_WRITE);
1644 channel_remove(writec);
1645out_err_result:
1646 return result;
1647}
1648
1649/**
1650 * Shutdown an interface.
1651 *
1652 * cgdev Device to be shut down.
1653 *
1654 * returns 0 on success, !0 on failure.
1655 */
1656static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1657{
1658 struct ctcm_priv *priv;
1659 struct net_device *dev;
1660
1661 priv = dev_get_drvdata(&cgdev->dev);
1662 if (!priv)
1663 return -ENODEV;
1664
1665 if (priv->channel[CTCM_READ]) {
1666 dev = priv->channel[CTCM_READ]->netdev;
1667 CTCM_DBF_DEV(SETUP, dev, "");
1668 /* Close the device */
1669 ctcm_close(dev);
1670 dev->flags &= ~IFF_RUNNING;
1671 ctcm_remove_attributes(&cgdev->dev);
1672 channel_free(priv->channel[CTCM_READ]);
1673 } else
1674 dev = NULL;
1675
1676 if (priv->channel[CTCM_WRITE])
1677 channel_free(priv->channel[CTCM_WRITE]);
1678
1679 if (dev) {
1680 unregister_netdev(dev);
1681 ctcm_free_netdevice(dev);
1682 }
1683
1684 if (priv->fsm)
1685 kfree_fsm(priv->fsm);
1686
1687 ccw_device_set_offline(cgdev->cdev[1]);
1688 ccw_device_set_offline(cgdev->cdev[0]);
1689
1690 if (priv->channel[CTCM_READ])
1691 channel_remove(priv->channel[CTCM_READ]);
1692 if (priv->channel[CTCM_WRITE])
1693 channel_remove(priv->channel[CTCM_WRITE]);
1694 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1695
1696 return 0;
1697
1698}
1699
1700
1701static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1702{
1703 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1704
1705 BUG_ON(priv == NULL);
1706
1707 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1708 "removing device %p, proto : %d",
1709 cgdev, priv->protocol);
1710
1711 if (cgdev->state == CCWGROUP_ONLINE)
1712 ctcm_shutdown_device(cgdev);
1713 ctcm_remove_files(&cgdev->dev);
1714 dev_set_drvdata(&cgdev->dev, NULL);
1715 kfree(priv);
1716 put_device(&cgdev->dev);
1717}
1718
1719static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1720{
1721 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1722
1723 if (gdev->state == CCWGROUP_OFFLINE)
1724 return 0;
1725 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1726 ctcm_close(priv->channel[CTCM_READ]->netdev);
1727 if (!wait_event_timeout(priv->fsm->wait_q,
1728 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1729 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1730 return -EBUSY;
1731 }
1732 ccw_device_set_offline(gdev->cdev[1]);
1733 ccw_device_set_offline(gdev->cdev[0]);
1734 return 0;
1735}
1736
1737static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1738{
1739 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1740 int rc;
1741
1742 if (gdev->state == CCWGROUP_OFFLINE)
1743 return 0;
1744 rc = ccw_device_set_online(gdev->cdev[1]);
1745 if (rc)
1746 goto err_out;
1747 rc = ccw_device_set_online(gdev->cdev[0]);
1748 if (rc)
1749 goto err_out;
1750 ctcm_open(priv->channel[CTCM_READ]->netdev);
1751err_out:
1752 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1753 return rc;
1754}
1755
1756static struct ccw_device_id ctcm_ids[] = {
1757 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1758 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1759 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1760 {},
1761};
1762MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1763
1764static struct ccw_driver ctcm_ccw_driver = {
1765 .driver = {
1766 .owner = THIS_MODULE,
1767 .name = "ctcm",
1768 },
1769 .ids = ctcm_ids,
1770 .probe = ccwgroup_probe_ccwdev,
1771 .remove = ccwgroup_remove_ccwdev,
1772};
1773
1774static struct ccwgroup_driver ctcm_group_driver = {
1775 .driver = {
1776 .owner = THIS_MODULE,
1777 .name = CTC_DRIVER_NAME,
1778 },
1779 .max_slaves = 2,
1780 .driver_id = 0xC3E3C3D4, /* CTCM */
1781 .probe = ctcm_probe_device,
1782 .remove = ctcm_remove_device,
1783 .set_online = ctcm_new_device,
1784 .set_offline = ctcm_shutdown_device,
1785 .freeze = ctcm_pm_suspend,
1786 .thaw = ctcm_pm_resume,
1787 .restore = ctcm_pm_resume,
1788};
1789
1790static ssize_t
1791ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1792 size_t count)
1793{
1794 int err;
1795
1796 err = ccwgroup_create_from_string(ctcm_root_dev,
1797 ctcm_group_driver.driver_id,
1798 &ctcm_ccw_driver, 2, buf);
1799 return err ? err : count;
1800}
1801
1802static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1803
1804static struct attribute *ctcm_group_attrs[] = {
1805 &driver_attr_group.attr,
1806 NULL,
1807};
1808
1809static struct attribute_group ctcm_group_attr_group = {
1810 .attrs = ctcm_group_attrs,
1811};
1812
1813static const struct attribute_group *ctcm_group_attr_groups[] = {
1814 &ctcm_group_attr_group,
1815 NULL,
1816};
1817
1818/*
1819 * Module related routines
1820 */
1821
1822/*
1823 * Prepare to be unloaded. Free IRQ's and release all resources.
1824 * This is called just before this module is unloaded. It is
1825 * not called, if the usage count is !0, so we don't need to check
1826 * for that.
1827 */
1828static void __exit ctcm_exit(void)
1829{
1830 driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1831 ccwgroup_driver_unregister(&ctcm_group_driver);
1832 ccw_driver_unregister(&ctcm_ccw_driver);
1833 root_device_unregister(ctcm_root_dev);
1834 ctcm_unregister_dbf_views();
1835 pr_info("CTCM driver unloaded\n");
1836}
1837
1838/*
1839 * Print Banner.
1840 */
1841static void print_banner(void)
1842{
1843 pr_info("CTCM driver initialized\n");
1844}
1845
1846/**
1847 * Initialize module.
1848 * This is called just after the module is loaded.
1849 *
1850 * returns 0 on success, !0 on error.
1851 */
1852static int __init ctcm_init(void)
1853{
1854 int ret;
1855
1856 channels = NULL;
1857
1858 ret = ctcm_register_dbf_views();
1859 if (ret)
1860 goto out_err;
1861 ctcm_root_dev = root_device_register("ctcm");
1862 ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1863 if (ret)
1864 goto register_err;
1865 ret = ccw_driver_register(&ctcm_ccw_driver);
1866 if (ret)
1867 goto ccw_err;
1868 ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1869 ret = ccwgroup_driver_register(&ctcm_group_driver);
1870 if (ret)
1871 goto ccwgroup_err;
1872 print_banner();
1873 return 0;
1874
1875ccwgroup_err:
1876 ccw_driver_unregister(&ctcm_ccw_driver);
1877ccw_err:
1878 root_device_unregister(ctcm_root_dev);
1879register_err:
1880 ctcm_unregister_dbf_views();
1881out_err:
1882 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1883 __func__, ret);
1884 return ret;
1885}
1886
1887module_init(ctcm_init);
1888module_exit(ctcm_exit);
1889
1890MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1891MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1892MODULE_LICENSE("GPL");
1893
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright IBM Corp. 2001, 2009
4 * Author(s):
5 * Original CTC driver(s):
6 * Fritz Elfert (felfert@millenux.com)
7 * Dieter Wellerdiek (wel@de.ibm.com)
8 * Martin Schwidefsky (schwidefsky@de.ibm.com)
9 * Denis Joseph Barrow (barrow_dj@yahoo.com)
10 * Jochen Roehrig (roehrig@de.ibm.com)
11 * Cornelia Huck <cornelia.huck@de.ibm.com>
12 * MPC additions:
13 * Belinda Thompson (belindat@us.ibm.com)
14 * Andy Richter (richtera@us.ibm.com)
15 * Revived by:
16 * Peter Tiedemann (ptiedem@de.ibm.com)
17 */
18
19#undef DEBUG
20#undef DEBUGDATA
21#undef DEBUGCCW
22
23#define KMSG_COMPONENT "ctcm"
24#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
25
26#include <linux/module.h>
27#include <linux/init.h>
28#include <linux/kernel.h>
29#include <linux/slab.h>
30#include <linux/errno.h>
31#include <linux/types.h>
32#include <linux/interrupt.h>
33#include <linux/timer.h>
34#include <linux/bitops.h>
35
36#include <linux/signal.h>
37#include <linux/string.h>
38
39#include <linux/ip.h>
40#include <linux/if_arp.h>
41#include <linux/tcp.h>
42#include <linux/skbuff.h>
43#include <linux/ctype.h>
44#include <net/dst.h>
45
46#include <linux/io.h>
47#include <asm/ccwdev.h>
48#include <asm/ccwgroup.h>
49#include <linux/uaccess.h>
50
51#include <asm/idals.h>
52
53#include "ctcm_fsms.h"
54#include "ctcm_main.h"
55
56/* Some common global variables */
57
58/*
59 * The root device for ctcm group devices
60 */
61static struct device *ctcm_root_dev;
62
63/*
64 * Linked list of all detected channels.
65 */
66struct channel *channels;
67
68/*
69 * Unpack a just received skb and hand it over to
70 * upper layers.
71 *
72 * ch The channel where this skb has been received.
73 * pskb The received skb.
74 */
75void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
76{
77 struct net_device *dev = ch->netdev;
78 struct ctcm_priv *priv = dev->ml_priv;
79 __u16 len = *((__u16 *) pskb->data);
80
81 skb_put(pskb, 2 + LL_HEADER_LENGTH);
82 skb_pull(pskb, 2);
83 pskb->dev = dev;
84 pskb->ip_summed = CHECKSUM_UNNECESSARY;
85 while (len > 0) {
86 struct sk_buff *skb;
87 int skblen;
88 struct ll_header *header = (struct ll_header *)pskb->data;
89
90 skb_pull(pskb, LL_HEADER_LENGTH);
91 if ((ch->protocol == CTCM_PROTO_S390) &&
92 (header->type != ETH_P_IP)) {
93 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
94 ch->logflags |= LOG_FLAG_ILLEGALPKT;
95 /*
96 * Check packet type only if we stick strictly
97 * to S/390's protocol of OS390. This only
98 * supports IP. Otherwise allow any packet
99 * type.
100 */
101 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
102 "%s(%s): Illegal packet type 0x%04x"
103 " - dropping",
104 CTCM_FUNTAIL, dev->name, header->type);
105 }
106 priv->stats.rx_dropped++;
107 priv->stats.rx_frame_errors++;
108 return;
109 }
110 pskb->protocol = cpu_to_be16(header->type);
111 if ((header->length <= LL_HEADER_LENGTH) ||
112 (len <= LL_HEADER_LENGTH)) {
113 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
114 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
115 "%s(%s): Illegal packet size %d(%d,%d)"
116 "- dropping",
117 CTCM_FUNTAIL, dev->name,
118 header->length, dev->mtu, len);
119 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
120 }
121
122 priv->stats.rx_dropped++;
123 priv->stats.rx_length_errors++;
124 return;
125 }
126 header->length -= LL_HEADER_LENGTH;
127 len -= LL_HEADER_LENGTH;
128 if ((header->length > skb_tailroom(pskb)) ||
129 (header->length > len)) {
130 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
131 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
132 "%s(%s): Packet size %d (overrun)"
133 " - dropping", CTCM_FUNTAIL,
134 dev->name, header->length);
135 ch->logflags |= LOG_FLAG_OVERRUN;
136 }
137
138 priv->stats.rx_dropped++;
139 priv->stats.rx_length_errors++;
140 return;
141 }
142 skb_put(pskb, header->length);
143 skb_reset_mac_header(pskb);
144 len -= header->length;
145 skb = dev_alloc_skb(pskb->len);
146 if (!skb) {
147 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
148 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
149 "%s(%s): MEMORY allocation error",
150 CTCM_FUNTAIL, dev->name);
151 ch->logflags |= LOG_FLAG_NOMEM;
152 }
153 priv->stats.rx_dropped++;
154 return;
155 }
156 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
157 pskb->len);
158 skb_reset_mac_header(skb);
159 skb->dev = pskb->dev;
160 skb->protocol = pskb->protocol;
161 pskb->ip_summed = CHECKSUM_UNNECESSARY;
162 skblen = skb->len;
163 /*
164 * reset logflags
165 */
166 ch->logflags = 0;
167 priv->stats.rx_packets++;
168 priv->stats.rx_bytes += skblen;
169 netif_rx(skb);
170 if (len > 0) {
171 skb_pull(pskb, header->length);
172 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
173 CTCM_DBF_DEV_NAME(TRACE, dev,
174 "Overrun in ctcm_unpack_skb");
175 ch->logflags |= LOG_FLAG_OVERRUN;
176 return;
177 }
178 skb_put(pskb, LL_HEADER_LENGTH);
179 }
180 }
181}
182
183/*
184 * Release a specific channel in the channel list.
185 *
186 * ch Pointer to channel struct to be released.
187 */
188static void channel_free(struct channel *ch)
189{
190 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
191 ch->flags &= ~CHANNEL_FLAGS_INUSE;
192 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
193}
194
195/*
196 * Remove a specific channel in the channel list.
197 *
198 * ch Pointer to channel struct to be released.
199 */
200static void channel_remove(struct channel *ch)
201{
202 struct channel **c = &channels;
203 char chid[CTCM_ID_SIZE];
204 int ok = 0;
205
206 if (ch == NULL)
207 return;
208 else
209 strscpy(chid, ch->id, sizeof(chid));
210
211 channel_free(ch);
212 while (*c) {
213 if (*c == ch) {
214 *c = ch->next;
215 fsm_deltimer(&ch->timer);
216 if (IS_MPC(ch))
217 fsm_deltimer(&ch->sweep_timer);
218
219 kfree_fsm(ch->fsm);
220 clear_normalized_cda(&ch->ccw[4]);
221 if (ch->trans_skb != NULL) {
222 clear_normalized_cda(&ch->ccw[1]);
223 dev_kfree_skb_any(ch->trans_skb);
224 }
225 if (IS_MPC(ch)) {
226 tasklet_kill(&ch->ch_tasklet);
227 tasklet_kill(&ch->ch_disc_tasklet);
228 kfree(ch->discontact_th);
229 }
230 kfree(ch->ccw);
231 kfree(ch->irb);
232 kfree(ch);
233 ok = 1;
234 break;
235 }
236 c = &((*c)->next);
237 }
238
239 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
240 chid, ok ? "OK" : "failed");
241}
242
243/*
244 * Get a specific channel from the channel list.
245 *
246 * type Type of channel we are interested in.
247 * id Id of channel we are interested in.
248 * direction Direction we want to use this channel for.
249 *
250 * returns Pointer to a channel or NULL if no matching channel available.
251 */
252static struct channel *channel_get(enum ctcm_channel_types type,
253 char *id, int direction)
254{
255 struct channel *ch = channels;
256
257 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
258 ch = ch->next;
259 if (!ch) {
260 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
261 "%s(%d, %s, %d) not found in channel list\n",
262 CTCM_FUNTAIL, type, id, direction);
263 } else {
264 if (ch->flags & CHANNEL_FLAGS_INUSE)
265 ch = NULL;
266 else {
267 ch->flags |= CHANNEL_FLAGS_INUSE;
268 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
269 ch->flags |= (direction == CTCM_WRITE)
270 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
271 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
272 }
273 }
274 return ch;
275}
276
277static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
278{
279 if (!IS_ERR(irb))
280 return 0;
281
282 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
283 "irb error %ld on device %s\n",
284 PTR_ERR(irb), dev_name(&cdev->dev));
285
286 switch (PTR_ERR(irb)) {
287 case -EIO:
288 dev_err(&cdev->dev,
289 "An I/O-error occurred on the CTCM device\n");
290 break;
291 case -ETIMEDOUT:
292 dev_err(&cdev->dev,
293 "An adapter hardware operation timed out\n");
294 break;
295 default:
296 dev_err(&cdev->dev,
297 "An error occurred on the adapter hardware\n");
298 }
299 return PTR_ERR(irb);
300}
301
302
303/*
304 * Check sense of a unit check.
305 *
306 * ch The channel, the sense code belongs to.
307 * sense The sense code to inspect.
308 */
309static void ccw_unit_check(struct channel *ch, __u8 sense)
310{
311 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
312 "%s(%s): %02x",
313 CTCM_FUNTAIL, ch->id, sense);
314
315 if (sense & SNS0_INTERVENTION_REQ) {
316 if (sense & 0x01) {
317 if (ch->sense_rc != 0x01) {
318 pr_notice(
319 "%s: The communication peer has "
320 "disconnected\n", ch->id);
321 ch->sense_rc = 0x01;
322 }
323 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
324 } else {
325 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
326 pr_notice(
327 "%s: The remote operating system is "
328 "not available\n", ch->id);
329 ch->sense_rc = SNS0_INTERVENTION_REQ;
330 }
331 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
332 }
333 } else if (sense & SNS0_EQUIPMENT_CHECK) {
334 if (sense & SNS0_BUS_OUT_CHECK) {
335 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
336 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
337 "%s(%s): remote HW error %02x",
338 CTCM_FUNTAIL, ch->id, sense);
339 ch->sense_rc = SNS0_BUS_OUT_CHECK;
340 }
341 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
342 } else {
343 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
344 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
345 "%s(%s): remote read parity error %02x",
346 CTCM_FUNTAIL, ch->id, sense);
347 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
348 }
349 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
350 }
351 } else if (sense & SNS0_BUS_OUT_CHECK) {
352 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
353 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
354 "%s(%s): BUS OUT error %02x",
355 CTCM_FUNTAIL, ch->id, sense);
356 ch->sense_rc = SNS0_BUS_OUT_CHECK;
357 }
358 if (sense & 0x04) /* data-streaming timeout */
359 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
360 else /* Data-transfer parity error */
361 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
362 } else if (sense & SNS0_CMD_REJECT) {
363 if (ch->sense_rc != SNS0_CMD_REJECT) {
364 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
365 "%s(%s): Command rejected",
366 CTCM_FUNTAIL, ch->id);
367 ch->sense_rc = SNS0_CMD_REJECT;
368 }
369 } else if (sense == 0) {
370 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
371 "%s(%s): Unit check ZERO",
372 CTCM_FUNTAIL, ch->id);
373 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
374 } else {
375 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
376 "%s(%s): Unit check code %02x unknown",
377 CTCM_FUNTAIL, ch->id, sense);
378 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
379 }
380}
381
382int ctcm_ch_alloc_buffer(struct channel *ch)
383{
384 clear_normalized_cda(&ch->ccw[1]);
385 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
386 if (ch->trans_skb == NULL) {
387 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
388 "%s(%s): %s trans_skb allocation error",
389 CTCM_FUNTAIL, ch->id,
390 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
391 "RX" : "TX");
392 return -ENOMEM;
393 }
394
395 ch->ccw[1].count = ch->max_bufsize;
396 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
397 dev_kfree_skb(ch->trans_skb);
398 ch->trans_skb = NULL;
399 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
400 "%s(%s): %s set norm_cda failed",
401 CTCM_FUNTAIL, ch->id,
402 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
403 "RX" : "TX");
404 return -ENOMEM;
405 }
406
407 ch->ccw[1].count = 0;
408 ch->trans_skb_data = ch->trans_skb->data;
409 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
410 return 0;
411}
412
413/*
414 * Interface API for upper network layers
415 */
416
417/*
418 * Open an interface.
419 * Called from generic network layer when ifconfig up is run.
420 *
421 * dev Pointer to interface struct.
422 *
423 * returns 0 on success, -ERRNO on failure. (Never fails.)
424 */
425int ctcm_open(struct net_device *dev)
426{
427 struct ctcm_priv *priv = dev->ml_priv;
428
429 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
430 if (!IS_MPC(priv))
431 fsm_event(priv->fsm, DEV_EVENT_START, dev);
432 return 0;
433}
434
435/*
436 * Close an interface.
437 * Called from generic network layer when ifconfig down is run.
438 *
439 * dev Pointer to interface struct.
440 *
441 * returns 0 on success, -ERRNO on failure. (Never fails.)
442 */
443int ctcm_close(struct net_device *dev)
444{
445 struct ctcm_priv *priv = dev->ml_priv;
446
447 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
448 if (!IS_MPC(priv))
449 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
450 return 0;
451}
452
453
454/*
455 * Transmit a packet.
456 * This is a helper function for ctcm_tx().
457 *
458 * ch Channel to be used for sending.
459 * skb Pointer to struct sk_buff of packet to send.
460 * The linklevel header has already been set up
461 * by ctcm_tx().
462 *
463 * returns 0 on success, -ERRNO on failure. (Never fails.)
464 */
465static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
466{
467 unsigned long saveflags;
468 struct ll_header header;
469 int rc = 0;
470 __u16 block_len;
471 int ccw_idx;
472 struct sk_buff *nskb;
473 unsigned long hi;
474
475 /* we need to acquire the lock for testing the state
476 * otherwise we can have an IRQ changing the state to
477 * TXIDLE after the test but before acquiring the lock.
478 */
479 spin_lock_irqsave(&ch->collect_lock, saveflags);
480 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
481 int l = skb->len + LL_HEADER_LENGTH;
482
483 if (ch->collect_len + l > ch->max_bufsize - 2) {
484 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
485 return -EBUSY;
486 } else {
487 refcount_inc(&skb->users);
488 header.length = l;
489 header.type = be16_to_cpu(skb->protocol);
490 header.unused = 0;
491 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
492 LL_HEADER_LENGTH);
493 skb_queue_tail(&ch->collect_queue, skb);
494 ch->collect_len += l;
495 }
496 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
497 goto done;
498 }
499 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
500 /*
501 * Protect skb against beeing free'd by upper
502 * layers.
503 */
504 refcount_inc(&skb->users);
505 ch->prof.txlen += skb->len;
506 header.length = skb->len + LL_HEADER_LENGTH;
507 header.type = be16_to_cpu(skb->protocol);
508 header.unused = 0;
509 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
510 block_len = skb->len + 2;
511 *((__u16 *)skb_push(skb, 2)) = block_len;
512
513 /*
514 * IDAL support in CTCM is broken, so we have to
515 * care about skb's above 2G ourselves.
516 */
517 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
518 if (hi) {
519 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
520 if (!nskb) {
521 refcount_dec(&skb->users);
522 skb_pull(skb, LL_HEADER_LENGTH + 2);
523 ctcm_clear_busy(ch->netdev);
524 return -ENOMEM;
525 } else {
526 skb_put_data(nskb, skb->data, skb->len);
527 refcount_inc(&nskb->users);
528 refcount_dec(&skb->users);
529 dev_kfree_skb_irq(skb);
530 skb = nskb;
531 }
532 }
533
534 ch->ccw[4].count = block_len;
535 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
536 /*
537 * idal allocation failed, try via copying to
538 * trans_skb. trans_skb usually has a pre-allocated
539 * idal.
540 */
541 if (ctcm_checkalloc_buffer(ch)) {
542 /*
543 * Remove our header. It gets added
544 * again on retransmit.
545 */
546 refcount_dec(&skb->users);
547 skb_pull(skb, LL_HEADER_LENGTH + 2);
548 ctcm_clear_busy(ch->netdev);
549 return -ENOMEM;
550 }
551
552 skb_reset_tail_pointer(ch->trans_skb);
553 ch->trans_skb->len = 0;
554 ch->ccw[1].count = skb->len;
555 skb_copy_from_linear_data(skb,
556 skb_put(ch->trans_skb, skb->len), skb->len);
557 refcount_dec(&skb->users);
558 dev_kfree_skb_irq(skb);
559 ccw_idx = 0;
560 } else {
561 skb_queue_tail(&ch->io_queue, skb);
562 ccw_idx = 3;
563 }
564 if (do_debug_ccw)
565 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
566 sizeof(struct ccw1) * 3);
567 ch->retry = 0;
568 fsm_newstate(ch->fsm, CTC_STATE_TX);
569 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
570 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
571 ch->prof.send_stamp = jiffies;
572 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 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 }
592done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595}
596
597static void ctcmpc_send_sweep_req(struct channel *rch)
598{
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
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 = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
627 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
628 header->sw.th_last_seq = ch->th_seq_num;
629
630 netif_trans_update(dev);
631 skb_queue_tail(&ch->sweep_queue, sweep_skb);
632
633 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
634
635 return;
636
637nomem:
638 grp->in_sweep = 0;
639 ctcm_clear_busy(dev);
640 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
641
642 return;
643}
644
645/*
646 * MPC mode version of transmit_skb
647 */
648static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
649{
650 struct pdu *p_header;
651 struct net_device *dev = ch->netdev;
652 struct ctcm_priv *priv = dev->ml_priv;
653 struct mpc_group *grp = priv->mpcg;
654 struct th_header *header;
655 struct sk_buff *nskb;
656 int rc = 0;
657 int ccw_idx;
658 unsigned long hi;
659 unsigned long saveflags = 0; /* avoids compiler warning */
660
661 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
662 __func__, dev->name, smp_processor_id(), ch,
663 ch->id, fsm_getstate_str(ch->fsm));
664
665 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
666 spin_lock_irqsave(&ch->collect_lock, saveflags);
667 refcount_inc(&skb->users);
668
669 p_header = skb_push(skb, PDU_HEADER_LENGTH);
670 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
671 p_header->pdu_proto = 0x01;
672 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
673 p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
674 } else {
675 p_header->pdu_flag = PDU_FIRST;
676 }
677 p_header->pdu_seq = 0;
678
679 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
680 "pdu header and data for up to 32 bytes:\n",
681 __func__, dev->name, skb->len);
682 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
683
684 skb_queue_tail(&ch->collect_queue, skb);
685 ch->collect_len += skb->len;
686
687 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
688 goto done;
689 }
690
691 /*
692 * Protect skb against beeing free'd by upper
693 * layers.
694 */
695 refcount_inc(&skb->users);
696
697 /*
698 * IDAL support in CTCM is broken, so we have to
699 * care about skb's above 2G ourselves.
700 */
701 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
702 if (hi) {
703 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
704 if (!nskb) {
705 goto nomem_exit;
706 } else {
707 skb_put_data(nskb, skb->data, skb->len);
708 refcount_inc(&nskb->users);
709 refcount_dec(&skb->users);
710 dev_kfree_skb_irq(skb);
711 skb = nskb;
712 }
713 }
714
715 p_header = skb_push(skb, PDU_HEADER_LENGTH);
716 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
717 p_header->pdu_proto = 0x01;
718 p_header->pdu_seq = 0;
719 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
720 p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
721 } else {
722 p_header->pdu_flag = PDU_FIRST;
723 }
724
725 if (ch->collect_len > 0) {
726 spin_lock_irqsave(&ch->collect_lock, saveflags);
727 skb_queue_tail(&ch->collect_queue, skb);
728 ch->collect_len += skb->len;
729 skb = skb_dequeue(&ch->collect_queue);
730 ch->collect_len -= skb->len;
731 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
732 }
733
734 p_header = (struct pdu *)skb->data;
735 p_header->pdu_flag |= PDU_LAST;
736
737 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
738
739 /* put the TH on the packet */
740 header = skb_push(skb, TH_HEADER_LENGTH);
741 memset(header, 0, TH_HEADER_LENGTH);
742
743 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
744 ch->th_seq_num++;
745 header->th_seq_num = ch->th_seq_num;
746
747 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
748 __func__, dev->name, ch->th_seq_num);
749
750 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
751 "up to 32 bytes sent to vtam:\n",
752 __func__, dev->name, skb->len);
753 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
754
755 ch->ccw[4].count = skb->len;
756 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
757 /*
758 * idal allocation failed, try via copying to trans_skb.
759 * trans_skb usually has a pre-allocated idal.
760 */
761 if (ctcm_checkalloc_buffer(ch)) {
762 /*
763 * Remove our header.
764 * It gets added again on retransmit.
765 */
766 goto nomem_exit;
767 }
768
769 skb_reset_tail_pointer(ch->trans_skb);
770 ch->trans_skb->len = 0;
771 ch->ccw[1].count = skb->len;
772 skb_put_data(ch->trans_skb, skb->data, skb->len);
773 refcount_dec(&skb->users);
774 dev_kfree_skb_irq(skb);
775 ccw_idx = 0;
776 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
777 "up to 32 bytes sent to vtam:\n",
778 __func__, dev->name, ch->trans_skb->len);
779 CTCM_D3_DUMP((char *)ch->trans_skb->data,
780 min_t(int, 32, ch->trans_skb->len));
781 } else {
782 skb_queue_tail(&ch->io_queue, skb);
783 ccw_idx = 3;
784 }
785 ch->retry = 0;
786 fsm_newstate(ch->fsm, CTC_STATE_TX);
787 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
788
789 if (do_debug_ccw)
790 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
791 sizeof(struct ccw1) * 3);
792
793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
794 ch->prof.send_stamp = jiffies;
795 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
796 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
797 if (ccw_idx == 3)
798 ch->prof.doios_single++;
799 if (rc != 0) {
800 fsm_deltimer(&ch->timer);
801 ctcm_ccw_check_rc(ch, rc, "single skb TX");
802 if (ccw_idx == 3)
803 skb_dequeue_tail(&ch->io_queue);
804 } else if (ccw_idx == 0) {
805 priv->stats.tx_packets++;
806 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
807 }
808 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
809 ctcmpc_send_sweep_req(ch);
810
811 goto done;
812nomem_exit:
813 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
814 "%s(%s): MEMORY allocation ERROR\n",
815 CTCM_FUNTAIL, ch->id);
816 rc = -ENOMEM;
817 refcount_dec(&skb->users);
818 dev_kfree_skb_any(skb);
819 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
820done:
821 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
822 return rc;
823}
824
825/*
826 * Start transmission of a packet.
827 * Called from generic network device layer.
828 */
829/* first merge version - leaving both functions separated */
830static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev)
831{
832 struct ctcm_priv *priv = dev->ml_priv;
833
834 if (skb == NULL) {
835 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
836 "%s(%s): NULL sk_buff passed",
837 CTCM_FUNTAIL, dev->name);
838 priv->stats.tx_dropped++;
839 return NETDEV_TX_OK;
840 }
841 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
842 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
843 "%s(%s): Got sk_buff with head room < %ld bytes",
844 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
845 dev_kfree_skb(skb);
846 priv->stats.tx_dropped++;
847 return NETDEV_TX_OK;
848 }
849
850 /*
851 * If channels are not running, try to restart them
852 * and throw away packet.
853 */
854 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
855 fsm_event(priv->fsm, DEV_EVENT_START, dev);
856 dev_kfree_skb(skb);
857 priv->stats.tx_dropped++;
858 priv->stats.tx_errors++;
859 priv->stats.tx_carrier_errors++;
860 return NETDEV_TX_OK;
861 }
862
863 if (ctcm_test_and_set_busy(dev))
864 return NETDEV_TX_BUSY;
865
866 netif_trans_update(dev);
867 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
868 return NETDEV_TX_BUSY;
869 return NETDEV_TX_OK;
870}
871
872/* unmerged MPC variant of ctcm_tx */
873static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
874{
875 int len = 0;
876 struct ctcm_priv *priv = dev->ml_priv;
877 struct mpc_group *grp = priv->mpcg;
878 struct sk_buff *newskb = NULL;
879
880 /*
881 * Some sanity checks ...
882 */
883 if (skb == NULL) {
884 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
885 "%s(%s): NULL sk_buff passed",
886 CTCM_FUNTAIL, dev->name);
887 priv->stats.tx_dropped++;
888 goto done;
889 }
890 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
891 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
892 "%s(%s): Got sk_buff with head room < %ld bytes",
893 CTCM_FUNTAIL, dev->name,
894 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
895
896 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
897
898 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
899 newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
900
901 if (!newskb) {
902 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
903 "%s: %s: __dev_alloc_skb failed",
904 __func__, dev->name);
905
906 dev_kfree_skb_any(skb);
907 priv->stats.tx_dropped++;
908 priv->stats.tx_errors++;
909 priv->stats.tx_carrier_errors++;
910 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
911 goto done;
912 }
913 newskb->protocol = skb->protocol;
914 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
915 skb_put_data(newskb, skb->data, skb->len);
916 dev_kfree_skb_any(skb);
917 skb = newskb;
918 }
919
920 /*
921 * If channels are not running,
922 * notify anybody about a link failure and throw
923 * away packet.
924 */
925 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
926 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
927 dev_kfree_skb_any(skb);
928 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
929 "%s(%s): inactive MPCGROUP - dropped",
930 CTCM_FUNTAIL, dev->name);
931 priv->stats.tx_dropped++;
932 priv->stats.tx_errors++;
933 priv->stats.tx_carrier_errors++;
934 goto done;
935 }
936
937 if (ctcm_test_and_set_busy(dev)) {
938 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
939 "%s(%s): device busy - dropped",
940 CTCM_FUNTAIL, dev->name);
941 dev_kfree_skb_any(skb);
942 priv->stats.tx_dropped++;
943 priv->stats.tx_errors++;
944 priv->stats.tx_carrier_errors++;
945 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
946 goto done;
947 }
948
949 netif_trans_update(dev);
950 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
951 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
952 "%s(%s): device error - dropped",
953 CTCM_FUNTAIL, dev->name);
954 dev_kfree_skb_any(skb);
955 priv->stats.tx_dropped++;
956 priv->stats.tx_errors++;
957 priv->stats.tx_carrier_errors++;
958 ctcm_clear_busy(dev);
959 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
960 goto done;
961 }
962 ctcm_clear_busy(dev);
963done:
964 if (do_debug)
965 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
966
967 return NETDEV_TX_OK; /* handle freeing of skb here */
968}
969
970
971/*
972 * Sets MTU of an interface.
973 *
974 * dev Pointer to interface struct.
975 * new_mtu The new MTU to use for this interface.
976 *
977 * returns 0 on success, -EINVAL if MTU is out of valid range.
978 * (valid range is 576 .. 65527). If VM is on the
979 * remote side, maximum MTU is 32760, however this is
980 * not checked here.
981 */
982static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
983{
984 struct ctcm_priv *priv;
985 int max_bufsize;
986
987 priv = dev->ml_priv;
988 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
989
990 if (IS_MPC(priv)) {
991 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
992 return -EINVAL;
993 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
994 } else {
995 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
996 return -EINVAL;
997 dev->hard_header_len = LL_HEADER_LENGTH + 2;
998 }
999 dev->mtu = new_mtu;
1000 return 0;
1001}
1002
1003/*
1004 * Returns interface statistics of a device.
1005 *
1006 * dev Pointer to interface struct.
1007 *
1008 * returns Pointer to stats struct of this interface.
1009 */
1010static struct net_device_stats *ctcm_stats(struct net_device *dev)
1011{
1012 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1013}
1014
1015static void ctcm_free_netdevice(struct net_device *dev)
1016{
1017 struct ctcm_priv *priv;
1018 struct mpc_group *grp;
1019
1020 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1021 "%s(%s)", CTCM_FUNTAIL, dev->name);
1022 priv = dev->ml_priv;
1023 if (priv) {
1024 grp = priv->mpcg;
1025 if (grp) {
1026 if (grp->fsm)
1027 kfree_fsm(grp->fsm);
1028 dev_kfree_skb(grp->xid_skb);
1029 dev_kfree_skb(grp->rcvd_xid_skb);
1030 tasklet_kill(&grp->mpc_tasklet2);
1031 kfree(grp);
1032 priv->mpcg = NULL;
1033 }
1034 if (priv->fsm) {
1035 kfree_fsm(priv->fsm);
1036 priv->fsm = NULL;
1037 }
1038 kfree(priv->xid);
1039 priv->xid = NULL;
1040 /*
1041 * Note: kfree(priv); is done in "opposite" function of
1042 * allocator function probe_device which is remove_device.
1043 */
1044 }
1045#ifdef MODULE
1046 free_netdev(dev);
1047#endif
1048}
1049
1050struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1051
1052static const struct net_device_ops ctcm_netdev_ops = {
1053 .ndo_open = ctcm_open,
1054 .ndo_stop = ctcm_close,
1055 .ndo_get_stats = ctcm_stats,
1056 .ndo_change_mtu = ctcm_change_mtu,
1057 .ndo_start_xmit = ctcm_tx,
1058};
1059
1060static const struct net_device_ops ctcm_mpc_netdev_ops = {
1061 .ndo_open = ctcm_open,
1062 .ndo_stop = ctcm_close,
1063 .ndo_get_stats = ctcm_stats,
1064 .ndo_change_mtu = ctcm_change_mtu,
1065 .ndo_start_xmit = ctcmpc_tx,
1066};
1067
1068static void ctcm_dev_setup(struct net_device *dev)
1069{
1070 dev->type = ARPHRD_SLIP;
1071 dev->tx_queue_len = 100;
1072 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1073 dev->min_mtu = 576;
1074 dev->max_mtu = 65527;
1075}
1076
1077/*
1078 * Initialize everything of the net device except the name and the
1079 * channel structs.
1080 */
1081static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1082{
1083 struct net_device *dev;
1084 struct mpc_group *grp;
1085 if (!priv)
1086 return NULL;
1087
1088 if (IS_MPC(priv))
1089 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1090 ctcm_dev_setup);
1091 else
1092 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1093 ctcm_dev_setup);
1094
1095 if (!dev) {
1096 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1097 "%s: MEMORY allocation ERROR",
1098 CTCM_FUNTAIL);
1099 return NULL;
1100 }
1101 dev->ml_priv = priv;
1102 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1103 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1104 dev_fsm, dev_fsm_len, GFP_KERNEL);
1105 if (priv->fsm == NULL) {
1106 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1107 free_netdev(dev);
1108 return NULL;
1109 }
1110 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1111 fsm_settimer(priv->fsm, &priv->restart_timer);
1112
1113 if (IS_MPC(priv)) {
1114 /* MPC Group Initializations */
1115 grp = ctcmpc_init_mpc_group(priv);
1116 if (grp == NULL) {
1117 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1118 free_netdev(dev);
1119 return NULL;
1120 }
1121 tasklet_init(&grp->mpc_tasklet2,
1122 mpc_group_ready, (unsigned long)dev);
1123 dev->mtu = MPC_BUFSIZE_DEFAULT -
1124 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1125
1126 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1127 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1128 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1129 } else {
1130 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1131 dev->netdev_ops = &ctcm_netdev_ops;
1132 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1133 }
1134
1135 CTCMY_DBF_DEV(SETUP, dev, "finished");
1136
1137 return dev;
1138}
1139
1140/*
1141 * Main IRQ handler.
1142 *
1143 * cdev The ccw_device the interrupt is for.
1144 * intparm interruption parameter.
1145 * irb interruption response block.
1146 */
1147static void ctcm_irq_handler(struct ccw_device *cdev,
1148 unsigned long intparm, struct irb *irb)
1149{
1150 struct channel *ch;
1151 struct net_device *dev;
1152 struct ctcm_priv *priv;
1153 struct ccwgroup_device *cgdev;
1154 int cstat;
1155 int dstat;
1156
1157 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1158 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1159
1160 if (ctcm_check_irb_error(cdev, irb))
1161 return;
1162
1163 cgdev = dev_get_drvdata(&cdev->dev);
1164
1165 cstat = irb->scsw.cmd.cstat;
1166 dstat = irb->scsw.cmd.dstat;
1167
1168 /* Check for unsolicited interrupts. */
1169 if (cgdev == NULL) {
1170 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1171 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1172 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1173 dev_warn(&cdev->dev,
1174 "The adapter received a non-specific IRQ\n");
1175 return;
1176 }
1177
1178 priv = dev_get_drvdata(&cgdev->dev);
1179
1180 /* Try to extract channel from driver data. */
1181 if (priv->channel[CTCM_READ]->cdev == cdev)
1182 ch = priv->channel[CTCM_READ];
1183 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1184 ch = priv->channel[CTCM_WRITE];
1185 else {
1186 dev_err(&cdev->dev,
1187 "%s: Internal error: Can't determine channel for "
1188 "interrupt device %s\n",
1189 __func__, dev_name(&cdev->dev));
1190 /* Explain: inconsistent internal structures */
1191 return;
1192 }
1193
1194 dev = ch->netdev;
1195 if (dev == NULL) {
1196 dev_err(&cdev->dev,
1197 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1198 __func__, ch);
1199 /* Explain: inconsistent internal structures */
1200 return;
1201 }
1202
1203 /* Copy interruption response block. */
1204 memcpy(ch->irb, irb, sizeof(struct irb));
1205
1206 /* Issue error message and return on subchannel error code */
1207 if (irb->scsw.cmd.cstat) {
1208 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1209 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1210 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1211 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1212 dev_warn(&cdev->dev,
1213 "A check occurred on the subchannel\n");
1214 return;
1215 }
1216
1217 /* Check the reason-code of a unit check */
1218 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1219 if ((irb->ecw[0] & ch->sense_rc) == 0)
1220 /* print it only once */
1221 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1222 "%s(%s): sense=%02x, ds=%02x",
1223 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1224 ccw_unit_check(ch, irb->ecw[0]);
1225 return;
1226 }
1227 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1228 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1229 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1230 else
1231 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1232 return;
1233 }
1234 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1235 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1236 return;
1237 }
1238 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1239 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1240 (irb->scsw.cmd.stctl ==
1241 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1242 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1243 else
1244 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1245
1246}
1247
1248static const struct device_type ctcm_devtype = {
1249 .name = "ctcm",
1250 .groups = ctcm_attr_groups,
1251};
1252
1253/*
1254 * Add ctcm specific attributes.
1255 * Add ctcm private data.
1256 *
1257 * cgdev pointer to ccwgroup_device just added
1258 *
1259 * returns 0 on success, !0 on failure.
1260 */
1261static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1262{
1263 struct ctcm_priv *priv;
1264
1265 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1266 "%s %p",
1267 __func__, cgdev);
1268
1269 if (!get_device(&cgdev->dev))
1270 return -ENODEV;
1271
1272 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1273 if (!priv) {
1274 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1275 "%s: memory allocation failure",
1276 CTCM_FUNTAIL);
1277 put_device(&cgdev->dev);
1278 return -ENOMEM;
1279 }
1280 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1281 cgdev->cdev[0]->handler = ctcm_irq_handler;
1282 cgdev->cdev[1]->handler = ctcm_irq_handler;
1283 dev_set_drvdata(&cgdev->dev, priv);
1284 cgdev->dev.type = &ctcm_devtype;
1285
1286 return 0;
1287}
1288
1289/*
1290 * Add a new channel to the list of channels.
1291 * Keeps the channel list sorted.
1292 *
1293 * cdev The ccw_device to be added.
1294 * type The type class of the new channel.
1295 * priv Points to the private data of the ccwgroup_device.
1296 *
1297 * returns 0 on success, !0 on error.
1298 */
1299static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1300 struct ctcm_priv *priv)
1301{
1302 struct channel **c = &channels;
1303 struct channel *ch;
1304 int ccw_num;
1305 int rc = 0;
1306
1307 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1308 "%s(%s), type %d, proto %d",
1309 __func__, dev_name(&cdev->dev), type, priv->protocol);
1310
1311 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1312 if (ch == NULL)
1313 return -ENOMEM;
1314
1315 ch->protocol = priv->protocol;
1316 if (IS_MPC(priv)) {
1317 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL);
1318 if (ch->discontact_th == NULL)
1319 goto nomem_return;
1320
1321 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1322 tasklet_init(&ch->ch_disc_tasklet,
1323 mpc_action_send_discontact, (unsigned long)ch);
1324
1325 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1326 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1327 ccw_num = 17;
1328 } else
1329 ccw_num = 8;
1330
1331 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1332 if (ch->ccw == NULL)
1333 goto nomem_return;
1334
1335 ch->cdev = cdev;
1336 scnprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1337 ch->type = type;
1338
1339 /*
1340 * "static" ccws are used in the following way:
1341 *
1342 * ccw[0..2] (Channel program for generic I/O):
1343 * 0: prepare
1344 * 1: read or write (depending on direction) with fixed
1345 * buffer (idal allocated once when buffer is allocated)
1346 * 2: nop
1347 * ccw[3..5] (Channel program for direct write of packets)
1348 * 3: prepare
1349 * 4: write (idal allocated on every write).
1350 * 5: nop
1351 * ccw[6..7] (Channel program for initial channel setup):
1352 * 6: set extended mode
1353 * 7: nop
1354 *
1355 * ch->ccw[0..5] are initialized in ch_action_start because
1356 * the channel's direction is yet unknown here.
1357 *
1358 * ccws used for xid2 negotiations
1359 * ch-ccw[8-14] need to be used for the XID exchange either
1360 * X side XID2 Processing
1361 * 8: write control
1362 * 9: write th
1363 * 10: write XID
1364 * 11: read th from secondary
1365 * 12: read XID from secondary
1366 * 13: read 4 byte ID
1367 * 14: nop
1368 * Y side XID Processing
1369 * 8: sense
1370 * 9: read th
1371 * 10: read XID
1372 * 11: write th
1373 * 12: write XID
1374 * 13: write 4 byte ID
1375 * 14: nop
1376 *
1377 * ccws used for double noop due to VM timing issues
1378 * which result in unrecoverable Busy on channel
1379 * 15: nop
1380 * 16: nop
1381 */
1382 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1383 ch->ccw[6].flags = CCW_FLAG_SLI;
1384
1385 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1386 ch->ccw[7].flags = CCW_FLAG_SLI;
1387
1388 if (IS_MPC(priv)) {
1389 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1390 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1391 ch->ccw[15].count = TH_HEADER_LENGTH;
1392 ch->ccw[15].cda = virt_to_dma32(ch->discontact_th);
1393
1394 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1395 ch->ccw[16].flags = CCW_FLAG_SLI;
1396
1397 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1398 ctc_ch_event_names, CTC_MPC_NR_STATES,
1399 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1400 mpc_ch_fsm_len, GFP_KERNEL);
1401 } else {
1402 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1403 ctc_ch_event_names, CTC_NR_STATES,
1404 CTC_NR_EVENTS, ch_fsm,
1405 ch_fsm_len, GFP_KERNEL);
1406 }
1407 if (ch->fsm == NULL)
1408 goto nomem_return;
1409
1410 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1411
1412 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1413 if (ch->irb == NULL)
1414 goto nomem_return;
1415
1416 while (*c && ctcm_less_than((*c)->id, ch->id))
1417 c = &(*c)->next;
1418
1419 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1420 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1421 "%s (%s) already in list, using old entry",
1422 __func__, (*c)->id);
1423
1424 goto free_return;
1425 }
1426
1427 spin_lock_init(&ch->collect_lock);
1428
1429 fsm_settimer(ch->fsm, &ch->timer);
1430 skb_queue_head_init(&ch->io_queue);
1431 skb_queue_head_init(&ch->collect_queue);
1432
1433 if (IS_MPC(priv)) {
1434 fsm_settimer(ch->fsm, &ch->sweep_timer);
1435 skb_queue_head_init(&ch->sweep_queue);
1436 }
1437 ch->next = *c;
1438 *c = ch;
1439 return 0;
1440
1441nomem_return:
1442 rc = -ENOMEM;
1443
1444free_return: /* note that all channel pointers are 0 or valid */
1445 kfree(ch->ccw);
1446 kfree(ch->discontact_th);
1447 kfree_fsm(ch->fsm);
1448 kfree(ch->irb);
1449 kfree(ch);
1450 return rc;
1451}
1452
1453/*
1454 * Return type of a detected device.
1455 */
1456static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1457{
1458 enum ctcm_channel_types type;
1459 type = (enum ctcm_channel_types)id->driver_info;
1460
1461 if (type == ctcm_channel_type_ficon)
1462 type = ctcm_channel_type_escon;
1463
1464 return type;
1465}
1466
1467/*
1468 *
1469 * Setup an interface.
1470 *
1471 * cgdev Device to be setup.
1472 *
1473 * returns 0 on success, !0 on failure.
1474 */
1475static int ctcm_new_device(struct ccwgroup_device *cgdev)
1476{
1477 char read_id[CTCM_ID_SIZE];
1478 char write_id[CTCM_ID_SIZE];
1479 int direction;
1480 enum ctcm_channel_types type;
1481 struct ctcm_priv *priv;
1482 struct net_device *dev;
1483 struct ccw_device *cdev0;
1484 struct ccw_device *cdev1;
1485 struct channel *readc;
1486 struct channel *writec;
1487 int ret;
1488 int result;
1489
1490 priv = dev_get_drvdata(&cgdev->dev);
1491 if (!priv) {
1492 result = -ENODEV;
1493 goto out_err_result;
1494 }
1495
1496 cdev0 = cgdev->cdev[0];
1497 cdev1 = cgdev->cdev[1];
1498
1499 type = get_channel_type(&cdev0->id);
1500
1501 scnprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1502 scnprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1503
1504 ret = add_channel(cdev0, type, priv);
1505 if (ret) {
1506 result = ret;
1507 goto out_err_result;
1508 }
1509 ret = add_channel(cdev1, type, priv);
1510 if (ret) {
1511 result = ret;
1512 goto out_remove_channel1;
1513 }
1514
1515 ret = ccw_device_set_online(cdev0);
1516 if (ret != 0) {
1517 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1518 "%s(%s) set_online rc=%d",
1519 CTCM_FUNTAIL, read_id, ret);
1520 result = -EIO;
1521 goto out_remove_channel2;
1522 }
1523
1524 ret = ccw_device_set_online(cdev1);
1525 if (ret != 0) {
1526 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1527 "%s(%s) set_online rc=%d",
1528 CTCM_FUNTAIL, write_id, ret);
1529
1530 result = -EIO;
1531 goto out_ccw1;
1532 }
1533
1534 dev = ctcm_init_netdevice(priv);
1535 if (dev == NULL) {
1536 result = -ENODEV;
1537 goto out_ccw2;
1538 }
1539
1540 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1541 priv->channel[direction] =
1542 channel_get(type, direction == CTCM_READ ?
1543 read_id : write_id, direction);
1544 if (priv->channel[direction] == NULL) {
1545 if (direction == CTCM_WRITE)
1546 channel_free(priv->channel[CTCM_READ]);
1547 result = -ENODEV;
1548 goto out_dev;
1549 }
1550 priv->channel[direction]->netdev = dev;
1551 priv->channel[direction]->protocol = priv->protocol;
1552 priv->channel[direction]->max_bufsize = priv->buffer_size;
1553 }
1554 /* sysfs magic */
1555 SET_NETDEV_DEV(dev, &cgdev->dev);
1556
1557 if (register_netdev(dev)) {
1558 result = -ENODEV;
1559 goto out_dev;
1560 }
1561
1562 strscpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1563
1564 dev_info(&dev->dev,
1565 "setup OK : r/w = %s/%s, protocol : %d\n",
1566 priv->channel[CTCM_READ]->id,
1567 priv->channel[CTCM_WRITE]->id, priv->protocol);
1568
1569 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1570 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1571 priv->channel[CTCM_READ]->id,
1572 priv->channel[CTCM_WRITE]->id, priv->protocol);
1573
1574 return 0;
1575out_dev:
1576 ctcm_free_netdevice(dev);
1577out_ccw2:
1578 ccw_device_set_offline(cgdev->cdev[1]);
1579out_ccw1:
1580 ccw_device_set_offline(cgdev->cdev[0]);
1581out_remove_channel2:
1582 readc = channel_get(type, read_id, CTCM_READ);
1583 channel_remove(readc);
1584out_remove_channel1:
1585 writec = channel_get(type, write_id, CTCM_WRITE);
1586 channel_remove(writec);
1587out_err_result:
1588 return result;
1589}
1590
1591/*
1592 * Shutdown an interface.
1593 *
1594 * cgdev Device to be shut down.
1595 *
1596 * returns 0 on success, !0 on failure.
1597 */
1598static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1599{
1600 struct ctcm_priv *priv;
1601 struct net_device *dev;
1602
1603 priv = dev_get_drvdata(&cgdev->dev);
1604 if (!priv)
1605 return -ENODEV;
1606
1607 if (priv->channel[CTCM_READ]) {
1608 dev = priv->channel[CTCM_READ]->netdev;
1609 CTCM_DBF_DEV(SETUP, dev, "");
1610 /* Close the device */
1611 ctcm_close(dev);
1612 dev->flags &= ~IFF_RUNNING;
1613 channel_free(priv->channel[CTCM_READ]);
1614 } else
1615 dev = NULL;
1616
1617 if (priv->channel[CTCM_WRITE])
1618 channel_free(priv->channel[CTCM_WRITE]);
1619
1620 if (dev) {
1621 unregister_netdev(dev);
1622 ctcm_free_netdevice(dev);
1623 }
1624
1625 if (priv->fsm)
1626 kfree_fsm(priv->fsm);
1627
1628 ccw_device_set_offline(cgdev->cdev[1]);
1629 ccw_device_set_offline(cgdev->cdev[0]);
1630 channel_remove(priv->channel[CTCM_READ]);
1631 channel_remove(priv->channel[CTCM_WRITE]);
1632 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1633
1634 return 0;
1635
1636}
1637
1638
1639static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1640{
1641 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1642
1643 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1644 "removing device %p, proto : %d",
1645 cgdev, priv->protocol);
1646
1647 if (cgdev->state == CCWGROUP_ONLINE)
1648 ctcm_shutdown_device(cgdev);
1649 dev_set_drvdata(&cgdev->dev, NULL);
1650 kfree(priv);
1651 put_device(&cgdev->dev);
1652}
1653
1654static struct ccw_device_id ctcm_ids[] = {
1655 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1656 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1657 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1658 {},
1659};
1660MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1661
1662static struct ccw_driver ctcm_ccw_driver = {
1663 .driver = {
1664 .owner = THIS_MODULE,
1665 .name = "ctcm",
1666 },
1667 .ids = ctcm_ids,
1668 .probe = ccwgroup_probe_ccwdev,
1669 .remove = ccwgroup_remove_ccwdev,
1670 .int_class = IRQIO_CTC,
1671};
1672
1673static struct ccwgroup_driver ctcm_group_driver = {
1674 .driver = {
1675 .owner = THIS_MODULE,
1676 .name = CTC_DRIVER_NAME,
1677 },
1678 .ccw_driver = &ctcm_ccw_driver,
1679 .setup = ctcm_probe_device,
1680 .remove = ctcm_remove_device,
1681 .set_online = ctcm_new_device,
1682 .set_offline = ctcm_shutdown_device,
1683};
1684
1685static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1686 size_t count)
1687{
1688 int err;
1689
1690 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1691 return err ? err : count;
1692}
1693static DRIVER_ATTR_WO(group);
1694
1695static struct attribute *ctcm_drv_attrs[] = {
1696 &driver_attr_group.attr,
1697 NULL,
1698};
1699static struct attribute_group ctcm_drv_attr_group = {
1700 .attrs = ctcm_drv_attrs,
1701};
1702static const struct attribute_group *ctcm_drv_attr_groups[] = {
1703 &ctcm_drv_attr_group,
1704 NULL,
1705};
1706
1707/*
1708 * Module related routines
1709 */
1710
1711/*
1712 * Prepare to be unloaded. Free IRQ's and release all resources.
1713 * This is called just before this module is unloaded. It is
1714 * not called, if the usage count is !0, so we don't need to check
1715 * for that.
1716 */
1717static void __exit ctcm_exit(void)
1718{
1719 ccwgroup_driver_unregister(&ctcm_group_driver);
1720 ccw_driver_unregister(&ctcm_ccw_driver);
1721 root_device_unregister(ctcm_root_dev);
1722 ctcm_unregister_dbf_views();
1723 pr_info("CTCM driver unloaded\n");
1724}
1725
1726/*
1727 * Print Banner.
1728 */
1729static void print_banner(void)
1730{
1731 pr_info("CTCM driver initialized\n");
1732}
1733
1734/*
1735 * Initialize module.
1736 * This is called just after the module is loaded.
1737 *
1738 * returns 0 on success, !0 on error.
1739 */
1740static int __init ctcm_init(void)
1741{
1742 int ret;
1743
1744 channels = NULL;
1745
1746 ret = ctcm_register_dbf_views();
1747 if (ret)
1748 goto out_err;
1749 ctcm_root_dev = root_device_register("ctcm");
1750 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1751 if (ret)
1752 goto register_err;
1753 ret = ccw_driver_register(&ctcm_ccw_driver);
1754 if (ret)
1755 goto ccw_err;
1756 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1757 ret = ccwgroup_driver_register(&ctcm_group_driver);
1758 if (ret)
1759 goto ccwgroup_err;
1760 print_banner();
1761 return 0;
1762
1763ccwgroup_err:
1764 ccw_driver_unregister(&ctcm_ccw_driver);
1765ccw_err:
1766 root_device_unregister(ctcm_root_dev);
1767register_err:
1768 ctcm_unregister_dbf_views();
1769out_err:
1770 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1771 __func__, ret);
1772 return ret;
1773}
1774
1775module_init(ctcm_init);
1776module_exit(ctcm_exit);
1777
1778MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1779MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1780MODULE_LICENSE("GPL");
1781