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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 WRITE_ONCE(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
1/*
2 * Copyright IBM Corp. 2001, 2009
3 * Author(s):
4 * Original CTC driver(s):
5 * Fritz Elfert (felfert@millenux.com)
6 * Dieter Wellerdiek (wel@de.ibm.com)
7 * Martin Schwidefsky (schwidefsky@de.ibm.com)
8 * Denis Joseph Barrow (barrow_dj@yahoo.com)
9 * Jochen Roehrig (roehrig@de.ibm.com)
10 * Cornelia Huck <cornelia.huck@de.ibm.com>
11 * MPC additions:
12 * Belinda Thompson (belindat@us.ibm.com)
13 * Andy Richter (richtera@us.ibm.com)
14 * Revived by:
15 * Peter Tiedemann (ptiedem@de.ibm.com)
16 */
17
18#undef DEBUG
19#undef DEBUGDATA
20#undef DEBUGCCW
21
22#define KMSG_COMPONENT "ctcm"
23#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
24
25#include <linux/module.h>
26#include <linux/init.h>
27#include <linux/kernel.h>
28#include <linux/slab.h>
29#include <linux/errno.h>
30#include <linux/types.h>
31#include <linux/interrupt.h>
32#include <linux/timer.h>
33#include <linux/bitops.h>
34
35#include <linux/signal.h>
36#include <linux/string.h>
37
38#include <linux/ip.h>
39#include <linux/if_arp.h>
40#include <linux/tcp.h>
41#include <linux/skbuff.h>
42#include <linux/ctype.h>
43#include <net/dst.h>
44
45#include <linux/io.h>
46#include <asm/ccwdev.h>
47#include <asm/ccwgroup.h>
48#include <linux/uaccess.h>
49
50#include <asm/idals.h>
51
52#include "ctcm_fsms.h"
53#include "ctcm_main.h"
54
55/* Some common global variables */
56
57/**
58 * The root device for ctcm group devices
59 */
60static struct device *ctcm_root_dev;
61
62/*
63 * Linked list of all detected channels.
64 */
65struct channel *channels;
66
67/**
68 * Unpack a just received skb and hand it over to
69 * upper layers.
70 *
71 * ch The channel where this skb has been received.
72 * pskb The received skb.
73 */
74void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
75{
76 struct net_device *dev = ch->netdev;
77 struct ctcm_priv *priv = dev->ml_priv;
78 __u16 len = *((__u16 *) pskb->data);
79
80 skb_put(pskb, 2 + LL_HEADER_LENGTH);
81 skb_pull(pskb, 2);
82 pskb->dev = dev;
83 pskb->ip_summed = CHECKSUM_UNNECESSARY;
84 while (len > 0) {
85 struct sk_buff *skb;
86 int skblen;
87 struct ll_header *header = (struct ll_header *)pskb->data;
88
89 skb_pull(pskb, LL_HEADER_LENGTH);
90 if ((ch->protocol == CTCM_PROTO_S390) &&
91 (header->type != ETH_P_IP)) {
92 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
93 ch->logflags |= LOG_FLAG_ILLEGALPKT;
94 /*
95 * Check packet type only if we stick strictly
96 * to S/390's protocol of OS390. This only
97 * supports IP. Otherwise allow any packet
98 * type.
99 */
100 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
101 "%s(%s): Illegal packet type 0x%04x"
102 " - dropping",
103 CTCM_FUNTAIL, dev->name, header->type);
104 }
105 priv->stats.rx_dropped++;
106 priv->stats.rx_frame_errors++;
107 return;
108 }
109 pskb->protocol = ntohs(header->type);
110 if ((header->length <= LL_HEADER_LENGTH) ||
111 (len <= LL_HEADER_LENGTH)) {
112 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
113 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
114 "%s(%s): Illegal packet size %d(%d,%d)"
115 "- dropping",
116 CTCM_FUNTAIL, dev->name,
117 header->length, dev->mtu, len);
118 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
119 }
120
121 priv->stats.rx_dropped++;
122 priv->stats.rx_length_errors++;
123 return;
124 }
125 header->length -= LL_HEADER_LENGTH;
126 len -= LL_HEADER_LENGTH;
127 if ((header->length > skb_tailroom(pskb)) ||
128 (header->length > len)) {
129 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
130 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
131 "%s(%s): Packet size %d (overrun)"
132 " - dropping", CTCM_FUNTAIL,
133 dev->name, header->length);
134 ch->logflags |= LOG_FLAG_OVERRUN;
135 }
136
137 priv->stats.rx_dropped++;
138 priv->stats.rx_length_errors++;
139 return;
140 }
141 skb_put(pskb, header->length);
142 skb_reset_mac_header(pskb);
143 len -= header->length;
144 skb = dev_alloc_skb(pskb->len);
145 if (!skb) {
146 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
148 "%s(%s): MEMORY allocation error",
149 CTCM_FUNTAIL, dev->name);
150 ch->logflags |= LOG_FLAG_NOMEM;
151 }
152 priv->stats.rx_dropped++;
153 return;
154 }
155 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
156 pskb->len);
157 skb_reset_mac_header(skb);
158 skb->dev = pskb->dev;
159 skb->protocol = pskb->protocol;
160 pskb->ip_summed = CHECKSUM_UNNECESSARY;
161 skblen = skb->len;
162 /*
163 * reset logflags
164 */
165 ch->logflags = 0;
166 priv->stats.rx_packets++;
167 priv->stats.rx_bytes += skblen;
168 netif_rx_ni(skb);
169 if (len > 0) {
170 skb_pull(pskb, header->length);
171 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
172 CTCM_DBF_DEV_NAME(TRACE, dev,
173 "Overrun in ctcm_unpack_skb");
174 ch->logflags |= LOG_FLAG_OVERRUN;
175 return;
176 }
177 skb_put(pskb, LL_HEADER_LENGTH);
178 }
179 }
180}
181
182/**
183 * Release a specific channel in the channel list.
184 *
185 * ch Pointer to channel struct to be released.
186 */
187static void channel_free(struct channel *ch)
188{
189 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
190 ch->flags &= ~CHANNEL_FLAGS_INUSE;
191 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
192}
193
194/**
195 * Remove a specific channel in the channel list.
196 *
197 * ch Pointer to channel struct to be released.
198 */
199static void channel_remove(struct channel *ch)
200{
201 struct channel **c = &channels;
202 char chid[CTCM_ID_SIZE+1];
203 int ok = 0;
204
205 if (ch == NULL)
206 return;
207 else
208 strncpy(chid, ch->id, CTCM_ID_SIZE);
209
210 channel_free(ch);
211 while (*c) {
212 if (*c == ch) {
213 *c = ch->next;
214 fsm_deltimer(&ch->timer);
215 if (IS_MPC(ch))
216 fsm_deltimer(&ch->sweep_timer);
217
218 kfree_fsm(ch->fsm);
219 clear_normalized_cda(&ch->ccw[4]);
220 if (ch->trans_skb != NULL) {
221 clear_normalized_cda(&ch->ccw[1]);
222 dev_kfree_skb_any(ch->trans_skb);
223 }
224 if (IS_MPC(ch)) {
225 tasklet_kill(&ch->ch_tasklet);
226 tasklet_kill(&ch->ch_disc_tasklet);
227 kfree(ch->discontact_th);
228 }
229 kfree(ch->ccw);
230 kfree(ch->irb);
231 kfree(ch);
232 ok = 1;
233 break;
234 }
235 c = &((*c)->next);
236 }
237
238 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
239 chid, ok ? "OK" : "failed");
240}
241
242/**
243 * Get a specific channel from the channel list.
244 *
245 * type Type of channel we are interested in.
246 * id Id of channel we are interested in.
247 * direction Direction we want to use this channel for.
248 *
249 * returns Pointer to a channel or NULL if no matching channel available.
250 */
251static struct channel *channel_get(enum ctcm_channel_types type,
252 char *id, int direction)
253{
254 struct channel *ch = channels;
255
256 while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
257 ch = ch->next;
258 if (!ch) {
259 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
260 "%s(%d, %s, %d) not found in channel list\n",
261 CTCM_FUNTAIL, type, id, direction);
262 } else {
263 if (ch->flags & CHANNEL_FLAGS_INUSE)
264 ch = NULL;
265 else {
266 ch->flags |= CHANNEL_FLAGS_INUSE;
267 ch->flags &= ~CHANNEL_FLAGS_RWMASK;
268 ch->flags |= (direction == CTCM_WRITE)
269 ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
270 fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
271 }
272 }
273 return ch;
274}
275
276static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
277{
278 if (!IS_ERR(irb))
279 return 0;
280
281 CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
282 "irb error %ld on device %s\n",
283 PTR_ERR(irb), dev_name(&cdev->dev));
284
285 switch (PTR_ERR(irb)) {
286 case -EIO:
287 dev_err(&cdev->dev,
288 "An I/O-error occurred on the CTCM device\n");
289 break;
290 case -ETIMEDOUT:
291 dev_err(&cdev->dev,
292 "An adapter hardware operation timed out\n");
293 break;
294 default:
295 dev_err(&cdev->dev,
296 "An error occurred on the adapter hardware\n");
297 }
298 return PTR_ERR(irb);
299}
300
301
302/**
303 * Check sense of a unit check.
304 *
305 * ch The channel, the sense code belongs to.
306 * sense The sense code to inspect.
307 */
308static inline void ccw_unit_check(struct channel *ch, __u8 sense)
309{
310 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
311 "%s(%s): %02x",
312 CTCM_FUNTAIL, ch->id, sense);
313
314 if (sense & SNS0_INTERVENTION_REQ) {
315 if (sense & 0x01) {
316 if (ch->sense_rc != 0x01) {
317 pr_notice(
318 "%s: The communication peer has "
319 "disconnected\n", ch->id);
320 ch->sense_rc = 0x01;
321 }
322 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
323 } else {
324 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
325 pr_notice(
326 "%s: The remote operating system is "
327 "not available\n", ch->id);
328 ch->sense_rc = SNS0_INTERVENTION_REQ;
329 }
330 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
331 }
332 } else if (sense & SNS0_EQUIPMENT_CHECK) {
333 if (sense & SNS0_BUS_OUT_CHECK) {
334 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
335 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
336 "%s(%s): remote HW error %02x",
337 CTCM_FUNTAIL, ch->id, sense);
338 ch->sense_rc = SNS0_BUS_OUT_CHECK;
339 }
340 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
341 } else {
342 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
343 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
344 "%s(%s): remote read parity error %02x",
345 CTCM_FUNTAIL, ch->id, sense);
346 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
347 }
348 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
349 }
350 } else if (sense & SNS0_BUS_OUT_CHECK) {
351 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
352 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
353 "%s(%s): BUS OUT error %02x",
354 CTCM_FUNTAIL, ch->id, sense);
355 ch->sense_rc = SNS0_BUS_OUT_CHECK;
356 }
357 if (sense & 0x04) /* data-streaming timeout */
358 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
359 else /* Data-transfer parity error */
360 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
361 } else if (sense & SNS0_CMD_REJECT) {
362 if (ch->sense_rc != SNS0_CMD_REJECT) {
363 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
364 "%s(%s): Command rejected",
365 CTCM_FUNTAIL, ch->id);
366 ch->sense_rc = SNS0_CMD_REJECT;
367 }
368 } else if (sense == 0) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
370 "%s(%s): Unit check ZERO",
371 CTCM_FUNTAIL, ch->id);
372 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
373 } else {
374 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
375 "%s(%s): Unit check code %02x unknown",
376 CTCM_FUNTAIL, ch->id, sense);
377 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
378 }
379}
380
381int ctcm_ch_alloc_buffer(struct channel *ch)
382{
383 clear_normalized_cda(&ch->ccw[1]);
384 ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
385 if (ch->trans_skb == NULL) {
386 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
387 "%s(%s): %s trans_skb allocation error",
388 CTCM_FUNTAIL, ch->id,
389 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
390 "RX" : "TX");
391 return -ENOMEM;
392 }
393
394 ch->ccw[1].count = ch->max_bufsize;
395 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
396 dev_kfree_skb(ch->trans_skb);
397 ch->trans_skb = NULL;
398 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
399 "%s(%s): %s set norm_cda failed",
400 CTCM_FUNTAIL, ch->id,
401 (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
402 "RX" : "TX");
403 return -ENOMEM;
404 }
405
406 ch->ccw[1].count = 0;
407 ch->trans_skb_data = ch->trans_skb->data;
408 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
409 return 0;
410}
411
412/*
413 * Interface API for upper network layers
414 */
415
416/**
417 * Open an interface.
418 * Called from generic network layer when ifconfig up is run.
419 *
420 * dev Pointer to interface struct.
421 *
422 * returns 0 on success, -ERRNO on failure. (Never fails.)
423 */
424int ctcm_open(struct net_device *dev)
425{
426 struct ctcm_priv *priv = dev->ml_priv;
427
428 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
429 if (!IS_MPC(priv))
430 fsm_event(priv->fsm, DEV_EVENT_START, dev);
431 return 0;
432}
433
434/**
435 * Close an interface.
436 * Called from generic network layer when ifconfig down is run.
437 *
438 * dev Pointer to interface struct.
439 *
440 * returns 0 on success, -ERRNO on failure. (Never fails.)
441 */
442int ctcm_close(struct net_device *dev)
443{
444 struct ctcm_priv *priv = dev->ml_priv;
445
446 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
447 if (!IS_MPC(priv))
448 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
449 return 0;
450}
451
452
453/**
454 * Transmit a packet.
455 * This is a helper function for ctcm_tx().
456 *
457 * ch Channel to be used for sending.
458 * skb Pointer to struct sk_buff of packet to send.
459 * The linklevel header has already been set up
460 * by ctcm_tx().
461 *
462 * returns 0 on success, -ERRNO on failure. (Never fails.)
463 */
464static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
465{
466 unsigned long saveflags;
467 struct ll_header header;
468 int rc = 0;
469 __u16 block_len;
470 int ccw_idx;
471 struct sk_buff *nskb;
472 unsigned long hi;
473
474 /* we need to acquire the lock for testing the state
475 * otherwise we can have an IRQ changing the state to
476 * TXIDLE after the test but before acquiring the lock.
477 */
478 spin_lock_irqsave(&ch->collect_lock, saveflags);
479 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
480 int l = skb->len + LL_HEADER_LENGTH;
481
482 if (ch->collect_len + l > ch->max_bufsize - 2) {
483 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
484 return -EBUSY;
485 } else {
486 atomic_inc(&skb->users);
487 header.length = l;
488 header.type = skb->protocol;
489 header.unused = 0;
490 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
491 LL_HEADER_LENGTH);
492 skb_queue_tail(&ch->collect_queue, skb);
493 ch->collect_len += l;
494 }
495 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
496 goto done;
497 }
498 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
499 /*
500 * Protect skb against beeing free'd by upper
501 * layers.
502 */
503 atomic_inc(&skb->users);
504 ch->prof.txlen += skb->len;
505 header.length = skb->len + LL_HEADER_LENGTH;
506 header.type = skb->protocol;
507 header.unused = 0;
508 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
509 block_len = skb->len + 2;
510 *((__u16 *)skb_push(skb, 2)) = block_len;
511
512 /*
513 * IDAL support in CTCM is broken, so we have to
514 * care about skb's above 2G ourselves.
515 */
516 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
517 if (hi) {
518 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
519 if (!nskb) {
520 atomic_dec(&skb->users);
521 skb_pull(skb, LL_HEADER_LENGTH + 2);
522 ctcm_clear_busy(ch->netdev);
523 return -ENOMEM;
524 } else {
525 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
526 atomic_inc(&nskb->users);
527 atomic_dec(&skb->users);
528 dev_kfree_skb_irq(skb);
529 skb = nskb;
530 }
531 }
532
533 ch->ccw[4].count = block_len;
534 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
535 /*
536 * idal allocation failed, try via copying to
537 * trans_skb. trans_skb usually has a pre-allocated
538 * idal.
539 */
540 if (ctcm_checkalloc_buffer(ch)) {
541 /*
542 * Remove our header. It gets added
543 * again on retransmit.
544 */
545 atomic_dec(&skb->users);
546 skb_pull(skb, LL_HEADER_LENGTH + 2);
547 ctcm_clear_busy(ch->netdev);
548 return -ENOMEM;
549 }
550
551 skb_reset_tail_pointer(ch->trans_skb);
552 ch->trans_skb->len = 0;
553 ch->ccw[1].count = skb->len;
554 skb_copy_from_linear_data(skb,
555 skb_put(ch->trans_skb, skb->len), skb->len);
556 atomic_dec(&skb->users);
557 dev_kfree_skb_irq(skb);
558 ccw_idx = 0;
559 } else {
560 skb_queue_tail(&ch->io_queue, skb);
561 ccw_idx = 3;
562 }
563 if (do_debug_ccw)
564 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
565 sizeof(struct ccw1) * 3);
566 ch->retry = 0;
567 fsm_newstate(ch->fsm, CTC_STATE_TX);
568 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
569 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
570 ch->prof.send_stamp = jiffies;
571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572 (unsigned long)ch, 0xff, 0);
573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574 if (ccw_idx == 3)
575 ch->prof.doios_single++;
576 if (rc != 0) {
577 fsm_deltimer(&ch->timer);
578 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579 if (ccw_idx == 3)
580 skb_dequeue_tail(&ch->io_queue);
581 /*
582 * Remove our header. It gets added
583 * again on retransmit.
584 */
585 skb_pull(skb, LL_HEADER_LENGTH + 2);
586 } else if (ccw_idx == 0) {
587 struct net_device *dev = ch->netdev;
588 struct ctcm_priv *priv = dev->ml_priv;
589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
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 = jiffies;
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
850 ctcmpc_send_sweep_req(ch);
851
852 goto done;
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, NET_NAME_UNKNOWN,
1141 ctcm_dev_setup);
1142 else
1143 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1144 ctcm_dev_setup);
1145
1146 if (!dev) {
1147 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1148 "%s: MEMORY allocation ERROR",
1149 CTCM_FUNTAIL);
1150 return NULL;
1151 }
1152 dev->ml_priv = priv;
1153 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1154 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1155 dev_fsm, dev_fsm_len, GFP_KERNEL);
1156 if (priv->fsm == NULL) {
1157 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1158 free_netdev(dev);
1159 return NULL;
1160 }
1161 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1162 fsm_settimer(priv->fsm, &priv->restart_timer);
1163
1164 if (IS_MPC(priv)) {
1165 /* MPC Group Initializations */
1166 grp = ctcmpc_init_mpc_group(priv);
1167 if (grp == NULL) {
1168 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1169 free_netdev(dev);
1170 return NULL;
1171 }
1172 tasklet_init(&grp->mpc_tasklet2,
1173 mpc_group_ready, (unsigned long)dev);
1174 dev->mtu = MPC_BUFSIZE_DEFAULT -
1175 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1176
1177 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1178 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1179 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1180 } else {
1181 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1182 dev->netdev_ops = &ctcm_netdev_ops;
1183 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1184 }
1185
1186 CTCMY_DBF_DEV(SETUP, dev, "finished");
1187
1188 return dev;
1189}
1190
1191/**
1192 * Main IRQ handler.
1193 *
1194 * cdev The ccw_device the interrupt is for.
1195 * intparm interruption parameter.
1196 * irb interruption response block.
1197 */
1198static void ctcm_irq_handler(struct ccw_device *cdev,
1199 unsigned long intparm, struct irb *irb)
1200{
1201 struct channel *ch;
1202 struct net_device *dev;
1203 struct ctcm_priv *priv;
1204 struct ccwgroup_device *cgdev;
1205 int cstat;
1206 int dstat;
1207
1208 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1209 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1210
1211 if (ctcm_check_irb_error(cdev, irb))
1212 return;
1213
1214 cgdev = dev_get_drvdata(&cdev->dev);
1215
1216 cstat = irb->scsw.cmd.cstat;
1217 dstat = irb->scsw.cmd.dstat;
1218
1219 /* Check for unsolicited interrupts. */
1220 if (cgdev == NULL) {
1221 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1222 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1223 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1224 dev_warn(&cdev->dev,
1225 "The adapter received a non-specific IRQ\n");
1226 return;
1227 }
1228
1229 priv = dev_get_drvdata(&cgdev->dev);
1230
1231 /* Try to extract channel from driver data. */
1232 if (priv->channel[CTCM_READ]->cdev == cdev)
1233 ch = priv->channel[CTCM_READ];
1234 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1235 ch = priv->channel[CTCM_WRITE];
1236 else {
1237 dev_err(&cdev->dev,
1238 "%s: Internal error: Can't determine channel for "
1239 "interrupt device %s\n",
1240 __func__, dev_name(&cdev->dev));
1241 /* Explain: inconsistent internal structures */
1242 return;
1243 }
1244
1245 dev = ch->netdev;
1246 if (dev == NULL) {
1247 dev_err(&cdev->dev,
1248 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1249 __func__, ch);
1250 /* Explain: inconsistent internal structures */
1251 return;
1252 }
1253
1254 /* Copy interruption response block. */
1255 memcpy(ch->irb, irb, sizeof(struct irb));
1256
1257 /* Issue error message and return on subchannel error code */
1258 if (irb->scsw.cmd.cstat) {
1259 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1260 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1261 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1262 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1263 dev_warn(&cdev->dev,
1264 "A check occurred on the subchannel\n");
1265 return;
1266 }
1267
1268 /* Check the reason-code of a unit check */
1269 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1270 if ((irb->ecw[0] & ch->sense_rc) == 0)
1271 /* print it only once */
1272 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1273 "%s(%s): sense=%02x, ds=%02x",
1274 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1275 ccw_unit_check(ch, irb->ecw[0]);
1276 return;
1277 }
1278 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1279 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1280 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1281 else
1282 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1283 return;
1284 }
1285 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1286 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1287 return;
1288 }
1289 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1290 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1291 (irb->scsw.cmd.stctl ==
1292 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1293 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1294 else
1295 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1296
1297}
1298
1299static const struct device_type ctcm_devtype = {
1300 .name = "ctcm",
1301 .groups = ctcm_attr_groups,
1302};
1303
1304/**
1305 * Add ctcm specific attributes.
1306 * Add ctcm private data.
1307 *
1308 * cgdev pointer to ccwgroup_device just added
1309 *
1310 * returns 0 on success, !0 on failure.
1311 */
1312static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1313{
1314 struct ctcm_priv *priv;
1315
1316 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1317 "%s %p",
1318 __func__, cgdev);
1319
1320 if (!get_device(&cgdev->dev))
1321 return -ENODEV;
1322
1323 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1324 if (!priv) {
1325 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1326 "%s: memory allocation failure",
1327 CTCM_FUNTAIL);
1328 put_device(&cgdev->dev);
1329 return -ENOMEM;
1330 }
1331 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1332 cgdev->cdev[0]->handler = ctcm_irq_handler;
1333 cgdev->cdev[1]->handler = ctcm_irq_handler;
1334 dev_set_drvdata(&cgdev->dev, priv);
1335 cgdev->dev.type = &ctcm_devtype;
1336
1337 return 0;
1338}
1339
1340/**
1341 * Add a new channel to the list of channels.
1342 * Keeps the channel list sorted.
1343 *
1344 * cdev The ccw_device to be added.
1345 * type The type class of the new channel.
1346 * priv Points to the private data of the ccwgroup_device.
1347 *
1348 * returns 0 on success, !0 on error.
1349 */
1350static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1351 struct ctcm_priv *priv)
1352{
1353 struct channel **c = &channels;
1354 struct channel *ch;
1355 int ccw_num;
1356 int rc = 0;
1357
1358 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1359 "%s(%s), type %d, proto %d",
1360 __func__, dev_name(&cdev->dev), type, priv->protocol);
1361
1362 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1363 if (ch == NULL)
1364 return -ENOMEM;
1365
1366 ch->protocol = priv->protocol;
1367 if (IS_MPC(priv)) {
1368 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1369 if (ch->discontact_th == NULL)
1370 goto nomem_return;
1371
1372 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1373 tasklet_init(&ch->ch_disc_tasklet,
1374 mpc_action_send_discontact, (unsigned long)ch);
1375
1376 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1377 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1378 ccw_num = 17;
1379 } else
1380 ccw_num = 8;
1381
1382 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1383 if (ch->ccw == NULL)
1384 goto nomem_return;
1385
1386 ch->cdev = cdev;
1387 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1388 ch->type = type;
1389
1390 /**
1391 * "static" ccws are used in the following way:
1392 *
1393 * ccw[0..2] (Channel program for generic I/O):
1394 * 0: prepare
1395 * 1: read or write (depending on direction) with fixed
1396 * buffer (idal allocated once when buffer is allocated)
1397 * 2: nop
1398 * ccw[3..5] (Channel program for direct write of packets)
1399 * 3: prepare
1400 * 4: write (idal allocated on every write).
1401 * 5: nop
1402 * ccw[6..7] (Channel program for initial channel setup):
1403 * 6: set extended mode
1404 * 7: nop
1405 *
1406 * ch->ccw[0..5] are initialized in ch_action_start because
1407 * the channel's direction is yet unknown here.
1408 *
1409 * ccws used for xid2 negotiations
1410 * ch-ccw[8-14] need to be used for the XID exchange either
1411 * X side XID2 Processing
1412 * 8: write control
1413 * 9: write th
1414 * 10: write XID
1415 * 11: read th from secondary
1416 * 12: read XID from secondary
1417 * 13: read 4 byte ID
1418 * 14: nop
1419 * Y side XID Processing
1420 * 8: sense
1421 * 9: read th
1422 * 10: read XID
1423 * 11: write th
1424 * 12: write XID
1425 * 13: write 4 byte ID
1426 * 14: nop
1427 *
1428 * ccws used for double noop due to VM timing issues
1429 * which result in unrecoverable Busy on channel
1430 * 15: nop
1431 * 16: nop
1432 */
1433 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1434 ch->ccw[6].flags = CCW_FLAG_SLI;
1435
1436 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1437 ch->ccw[7].flags = CCW_FLAG_SLI;
1438
1439 if (IS_MPC(priv)) {
1440 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1441 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1442 ch->ccw[15].count = TH_HEADER_LENGTH;
1443 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1444
1445 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1446 ch->ccw[16].flags = CCW_FLAG_SLI;
1447
1448 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1449 ctc_ch_event_names, CTC_MPC_NR_STATES,
1450 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1451 mpc_ch_fsm_len, GFP_KERNEL);
1452 } else {
1453 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1454 ctc_ch_event_names, CTC_NR_STATES,
1455 CTC_NR_EVENTS, ch_fsm,
1456 ch_fsm_len, GFP_KERNEL);
1457 }
1458 if (ch->fsm == NULL)
1459 goto nomem_return;
1460
1461 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1462
1463 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1464 if (ch->irb == NULL)
1465 goto nomem_return;
1466
1467 while (*c && ctcm_less_than((*c)->id, ch->id))
1468 c = &(*c)->next;
1469
1470 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1471 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1472 "%s (%s) already in list, using old entry",
1473 __func__, (*c)->id);
1474
1475 goto free_return;
1476 }
1477
1478 spin_lock_init(&ch->collect_lock);
1479
1480 fsm_settimer(ch->fsm, &ch->timer);
1481 skb_queue_head_init(&ch->io_queue);
1482 skb_queue_head_init(&ch->collect_queue);
1483
1484 if (IS_MPC(priv)) {
1485 fsm_settimer(ch->fsm, &ch->sweep_timer);
1486 skb_queue_head_init(&ch->sweep_queue);
1487 }
1488 ch->next = *c;
1489 *c = ch;
1490 return 0;
1491
1492nomem_return:
1493 rc = -ENOMEM;
1494
1495free_return: /* note that all channel pointers are 0 or valid */
1496 kfree(ch->ccw);
1497 kfree(ch->discontact_th);
1498 kfree_fsm(ch->fsm);
1499 kfree(ch->irb);
1500 kfree(ch);
1501 return rc;
1502}
1503
1504/*
1505 * Return type of a detected device.
1506 */
1507static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1508{
1509 enum ctcm_channel_types type;
1510 type = (enum ctcm_channel_types)id->driver_info;
1511
1512 if (type == ctcm_channel_type_ficon)
1513 type = ctcm_channel_type_escon;
1514
1515 return type;
1516}
1517
1518/**
1519 *
1520 * Setup an interface.
1521 *
1522 * cgdev Device to be setup.
1523 *
1524 * returns 0 on success, !0 on failure.
1525 */
1526static int ctcm_new_device(struct ccwgroup_device *cgdev)
1527{
1528 char read_id[CTCM_ID_SIZE];
1529 char write_id[CTCM_ID_SIZE];
1530 int direction;
1531 enum ctcm_channel_types type;
1532 struct ctcm_priv *priv;
1533 struct net_device *dev;
1534 struct ccw_device *cdev0;
1535 struct ccw_device *cdev1;
1536 struct channel *readc;
1537 struct channel *writec;
1538 int ret;
1539 int result;
1540
1541 priv = dev_get_drvdata(&cgdev->dev);
1542 if (!priv) {
1543 result = -ENODEV;
1544 goto out_err_result;
1545 }
1546
1547 cdev0 = cgdev->cdev[0];
1548 cdev1 = cgdev->cdev[1];
1549
1550 type = get_channel_type(&cdev0->id);
1551
1552 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1553 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1554
1555 ret = add_channel(cdev0, type, priv);
1556 if (ret) {
1557 result = ret;
1558 goto out_err_result;
1559 }
1560 ret = add_channel(cdev1, type, priv);
1561 if (ret) {
1562 result = ret;
1563 goto out_remove_channel1;
1564 }
1565
1566 ret = ccw_device_set_online(cdev0);
1567 if (ret != 0) {
1568 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1569 "%s(%s) set_online rc=%d",
1570 CTCM_FUNTAIL, read_id, ret);
1571 result = -EIO;
1572 goto out_remove_channel2;
1573 }
1574
1575 ret = ccw_device_set_online(cdev1);
1576 if (ret != 0) {
1577 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1578 "%s(%s) set_online rc=%d",
1579 CTCM_FUNTAIL, write_id, ret);
1580
1581 result = -EIO;
1582 goto out_ccw1;
1583 }
1584
1585 dev = ctcm_init_netdevice(priv);
1586 if (dev == NULL) {
1587 result = -ENODEV;
1588 goto out_ccw2;
1589 }
1590
1591 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1592 priv->channel[direction] =
1593 channel_get(type, direction == CTCM_READ ?
1594 read_id : write_id, direction);
1595 if (priv->channel[direction] == NULL) {
1596 if (direction == CTCM_WRITE)
1597 channel_free(priv->channel[CTCM_READ]);
1598 goto out_dev;
1599 }
1600 priv->channel[direction]->netdev = dev;
1601 priv->channel[direction]->protocol = priv->protocol;
1602 priv->channel[direction]->max_bufsize = priv->buffer_size;
1603 }
1604 /* sysfs magic */
1605 SET_NETDEV_DEV(dev, &cgdev->dev);
1606
1607 if (register_netdev(dev)) {
1608 result = -ENODEV;
1609 goto out_dev;
1610 }
1611
1612 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1613
1614 dev_info(&dev->dev,
1615 "setup OK : r/w = %s/%s, protocol : %d\n",
1616 priv->channel[CTCM_READ]->id,
1617 priv->channel[CTCM_WRITE]->id, priv->protocol);
1618
1619 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1620 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1621 priv->channel[CTCM_READ]->id,
1622 priv->channel[CTCM_WRITE]->id, priv->protocol);
1623
1624 return 0;
1625out_dev:
1626 ctcm_free_netdevice(dev);
1627out_ccw2:
1628 ccw_device_set_offline(cgdev->cdev[1]);
1629out_ccw1:
1630 ccw_device_set_offline(cgdev->cdev[0]);
1631out_remove_channel2:
1632 readc = channel_get(type, read_id, CTCM_READ);
1633 channel_remove(readc);
1634out_remove_channel1:
1635 writec = channel_get(type, write_id, CTCM_WRITE);
1636 channel_remove(writec);
1637out_err_result:
1638 return result;
1639}
1640
1641/**
1642 * Shutdown an interface.
1643 *
1644 * cgdev Device to be shut down.
1645 *
1646 * returns 0 on success, !0 on failure.
1647 */
1648static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1649{
1650 struct ctcm_priv *priv;
1651 struct net_device *dev;
1652
1653 priv = dev_get_drvdata(&cgdev->dev);
1654 if (!priv)
1655 return -ENODEV;
1656
1657 if (priv->channel[CTCM_READ]) {
1658 dev = priv->channel[CTCM_READ]->netdev;
1659 CTCM_DBF_DEV(SETUP, dev, "");
1660 /* Close the device */
1661 ctcm_close(dev);
1662 dev->flags &= ~IFF_RUNNING;
1663 channel_free(priv->channel[CTCM_READ]);
1664 } else
1665 dev = NULL;
1666
1667 if (priv->channel[CTCM_WRITE])
1668 channel_free(priv->channel[CTCM_WRITE]);
1669
1670 if (dev) {
1671 unregister_netdev(dev);
1672 ctcm_free_netdevice(dev);
1673 }
1674
1675 if (priv->fsm)
1676 kfree_fsm(priv->fsm);
1677
1678 ccw_device_set_offline(cgdev->cdev[1]);
1679 ccw_device_set_offline(cgdev->cdev[0]);
1680 channel_remove(priv->channel[CTCM_READ]);
1681 channel_remove(priv->channel[CTCM_WRITE]);
1682 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1683
1684 return 0;
1685
1686}
1687
1688
1689static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1690{
1691 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1692
1693 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1694 "removing device %p, proto : %d",
1695 cgdev, priv->protocol);
1696
1697 if (cgdev->state == CCWGROUP_ONLINE)
1698 ctcm_shutdown_device(cgdev);
1699 dev_set_drvdata(&cgdev->dev, NULL);
1700 kfree(priv);
1701 put_device(&cgdev->dev);
1702}
1703
1704static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1705{
1706 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1707
1708 if (gdev->state == CCWGROUP_OFFLINE)
1709 return 0;
1710 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1711 ctcm_close(priv->channel[CTCM_READ]->netdev);
1712 if (!wait_event_timeout(priv->fsm->wait_q,
1713 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1714 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1715 return -EBUSY;
1716 }
1717 ccw_device_set_offline(gdev->cdev[1]);
1718 ccw_device_set_offline(gdev->cdev[0]);
1719 return 0;
1720}
1721
1722static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1723{
1724 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1725 int rc;
1726
1727 if (gdev->state == CCWGROUP_OFFLINE)
1728 return 0;
1729 rc = ccw_device_set_online(gdev->cdev[1]);
1730 if (rc)
1731 goto err_out;
1732 rc = ccw_device_set_online(gdev->cdev[0]);
1733 if (rc)
1734 goto err_out;
1735 ctcm_open(priv->channel[CTCM_READ]->netdev);
1736err_out:
1737 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1738 return rc;
1739}
1740
1741static struct ccw_device_id ctcm_ids[] = {
1742 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1743 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1744 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1745 {},
1746};
1747MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1748
1749static struct ccw_driver ctcm_ccw_driver = {
1750 .driver = {
1751 .owner = THIS_MODULE,
1752 .name = "ctcm",
1753 },
1754 .ids = ctcm_ids,
1755 .probe = ccwgroup_probe_ccwdev,
1756 .remove = ccwgroup_remove_ccwdev,
1757 .int_class = IRQIO_CTC,
1758};
1759
1760static struct ccwgroup_driver ctcm_group_driver = {
1761 .driver = {
1762 .owner = THIS_MODULE,
1763 .name = CTC_DRIVER_NAME,
1764 },
1765 .setup = ctcm_probe_device,
1766 .remove = ctcm_remove_device,
1767 .set_online = ctcm_new_device,
1768 .set_offline = ctcm_shutdown_device,
1769 .freeze = ctcm_pm_suspend,
1770 .thaw = ctcm_pm_resume,
1771 .restore = ctcm_pm_resume,
1772};
1773
1774static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1775 const char *buf, size_t count)
1776{
1777 int err;
1778
1779 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1780 return err ? err : count;
1781}
1782static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1783
1784static struct attribute *ctcm_drv_attrs[] = {
1785 &driver_attr_group.attr,
1786 NULL,
1787};
1788static struct attribute_group ctcm_drv_attr_group = {
1789 .attrs = ctcm_drv_attrs,
1790};
1791static const struct attribute_group *ctcm_drv_attr_groups[] = {
1792 &ctcm_drv_attr_group,
1793 NULL,
1794};
1795
1796/*
1797 * Module related routines
1798 */
1799
1800/*
1801 * Prepare to be unloaded. Free IRQ's and release all resources.
1802 * This is called just before this module is unloaded. It is
1803 * not called, if the usage count is !0, so we don't need to check
1804 * for that.
1805 */
1806static void __exit ctcm_exit(void)
1807{
1808 ccwgroup_driver_unregister(&ctcm_group_driver);
1809 ccw_driver_unregister(&ctcm_ccw_driver);
1810 root_device_unregister(ctcm_root_dev);
1811 ctcm_unregister_dbf_views();
1812 pr_info("CTCM driver unloaded\n");
1813}
1814
1815/*
1816 * Print Banner.
1817 */
1818static void print_banner(void)
1819{
1820 pr_info("CTCM driver initialized\n");
1821}
1822
1823/**
1824 * Initialize module.
1825 * This is called just after the module is loaded.
1826 *
1827 * returns 0 on success, !0 on error.
1828 */
1829static int __init ctcm_init(void)
1830{
1831 int ret;
1832
1833 channels = NULL;
1834
1835 ret = ctcm_register_dbf_views();
1836 if (ret)
1837 goto out_err;
1838 ctcm_root_dev = root_device_register("ctcm");
1839 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1840 if (ret)
1841 goto register_err;
1842 ret = ccw_driver_register(&ctcm_ccw_driver);
1843 if (ret)
1844 goto ccw_err;
1845 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1846 ret = ccwgroup_driver_register(&ctcm_group_driver);
1847 if (ret)
1848 goto ccwgroup_err;
1849 print_banner();
1850 return 0;
1851
1852ccwgroup_err:
1853 ccw_driver_unregister(&ctcm_ccw_driver);
1854ccw_err:
1855 root_device_unregister(ctcm_root_dev);
1856register_err:
1857 ctcm_unregister_dbf_views();
1858out_err:
1859 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1860 __func__, ret);
1861 return ret;
1862}
1863
1864module_init(ctcm_init);
1865module_exit(ctcm_exit);
1866
1867MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1868MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1869MODULE_LICENSE("GPL");
1870