Loading...
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_ni(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+1];
204 int ok = 0;
205
206 if (ch == NULL)
207 return;
208 else
209 strncpy(chid, ch->id, CTCM_ID_SIZE);
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 = 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 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 netif_trans_update(dev);
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
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 refcount_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
687 goto nomem_exit;
688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 refcount_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 skb_put_data(nskb, skb->data, skb->len);
732 refcount_inc(&nskb->users);
733 refcount_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741 if (!p_header)
742 goto nomem_exit;
743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772 if (!header)
773 goto nomem_exit;
774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
803 * Remove our header.
804 * It gets added again on retransmit.
805 */
806 goto nomem_exit;
807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 skb_put_data(ch->trans_skb, skb->data, skb->len);
813 refcount_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], 0, 0xff, 0);
836 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
837 if (ccw_idx == 3)
838 ch->prof.doios_single++;
839 if (rc != 0) {
840 fsm_deltimer(&ch->timer);
841 ctcm_ccw_check_rc(ch, rc, "single skb TX");
842 if (ccw_idx == 3)
843 skb_dequeue_tail(&ch->io_queue);
844 } else if (ccw_idx == 0) {
845 priv->stats.tx_packets++;
846 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
847 }
848 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
849 ctcmpc_send_sweep_req(ch);
850
851 goto done;
852nomem_exit:
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
854 "%s(%s): MEMORY allocation ERROR\n",
855 CTCM_FUNTAIL, ch->id);
856 rc = -ENOMEM;
857 refcount_dec(&skb->users);
858 dev_kfree_skb_any(skb);
859 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
860done:
861 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
862 return rc;
863}
864
865/**
866 * Start transmission of a packet.
867 * Called from generic network device layer.
868 *
869 * skb Pointer to buffer containing the packet.
870 * dev Pointer to interface struct.
871 *
872 * returns 0 if packet consumed, !0 if packet rejected.
873 * Note: If we return !0, then the packet is free'd by
874 * the generic network layer.
875 */
876/* first merge version - leaving both functions separated */
877static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
878{
879 struct ctcm_priv *priv = dev->ml_priv;
880
881 if (skb == NULL) {
882 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
883 "%s(%s): NULL sk_buff passed",
884 CTCM_FUNTAIL, dev->name);
885 priv->stats.tx_dropped++;
886 return NETDEV_TX_OK;
887 }
888 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
889 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
890 "%s(%s): Got sk_buff with head room < %ld bytes",
891 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
892 dev_kfree_skb(skb);
893 priv->stats.tx_dropped++;
894 return NETDEV_TX_OK;
895 }
896
897 /*
898 * If channels are not running, try to restart them
899 * and throw away packet.
900 */
901 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
902 fsm_event(priv->fsm, DEV_EVENT_START, dev);
903 dev_kfree_skb(skb);
904 priv->stats.tx_dropped++;
905 priv->stats.tx_errors++;
906 priv->stats.tx_carrier_errors++;
907 return NETDEV_TX_OK;
908 }
909
910 if (ctcm_test_and_set_busy(dev))
911 return NETDEV_TX_BUSY;
912
913 netif_trans_update(dev);
914 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
915 return NETDEV_TX_BUSY;
916 return NETDEV_TX_OK;
917}
918
919/* unmerged MPC variant of ctcm_tx */
920static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
921{
922 int len = 0;
923 struct ctcm_priv *priv = dev->ml_priv;
924 struct mpc_group *grp = priv->mpcg;
925 struct sk_buff *newskb = NULL;
926
927 /*
928 * Some sanity checks ...
929 */
930 if (skb == NULL) {
931 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
932 "%s(%s): NULL sk_buff passed",
933 CTCM_FUNTAIL, dev->name);
934 priv->stats.tx_dropped++;
935 goto done;
936 }
937 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
938 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
939 "%s(%s): Got sk_buff with head room < %ld bytes",
940 CTCM_FUNTAIL, dev->name,
941 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
942
943 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
944
945 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
946 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
947
948 if (!newskb) {
949 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
950 "%s: %s: __dev_alloc_skb failed",
951 __func__, dev->name);
952
953 dev_kfree_skb_any(skb);
954 priv->stats.tx_dropped++;
955 priv->stats.tx_errors++;
956 priv->stats.tx_carrier_errors++;
957 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
958 goto done;
959 }
960 newskb->protocol = skb->protocol;
961 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
962 skb_put_data(newskb, skb->data, skb->len);
963 dev_kfree_skb_any(skb);
964 skb = newskb;
965 }
966
967 /*
968 * If channels are not running,
969 * notify anybody about a link failure and throw
970 * away packet.
971 */
972 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
973 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
974 dev_kfree_skb_any(skb);
975 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
976 "%s(%s): inactive MPCGROUP - dropped",
977 CTCM_FUNTAIL, dev->name);
978 priv->stats.tx_dropped++;
979 priv->stats.tx_errors++;
980 priv->stats.tx_carrier_errors++;
981 goto done;
982 }
983
984 if (ctcm_test_and_set_busy(dev)) {
985 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
986 "%s(%s): device busy - dropped",
987 CTCM_FUNTAIL, dev->name);
988 dev_kfree_skb_any(skb);
989 priv->stats.tx_dropped++;
990 priv->stats.tx_errors++;
991 priv->stats.tx_carrier_errors++;
992 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
993 goto done;
994 }
995
996 netif_trans_update(dev);
997 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
998 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
999 "%s(%s): device error - dropped",
1000 CTCM_FUNTAIL, dev->name);
1001 dev_kfree_skb_any(skb);
1002 priv->stats.tx_dropped++;
1003 priv->stats.tx_errors++;
1004 priv->stats.tx_carrier_errors++;
1005 ctcm_clear_busy(dev);
1006 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1007 goto done;
1008 }
1009 ctcm_clear_busy(dev);
1010done:
1011 if (do_debug)
1012 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1013
1014 return NETDEV_TX_OK; /* handle freeing of skb here */
1015}
1016
1017
1018/**
1019 * Sets MTU of an interface.
1020 *
1021 * dev Pointer to interface struct.
1022 * new_mtu The new MTU to use for this interface.
1023 *
1024 * returns 0 on success, -EINVAL if MTU is out of valid range.
1025 * (valid range is 576 .. 65527). If VM is on the
1026 * remote side, maximum MTU is 32760, however this is
1027 * not checked here.
1028 */
1029static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1030{
1031 struct ctcm_priv *priv;
1032 int max_bufsize;
1033
1034 priv = dev->ml_priv;
1035 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1036
1037 if (IS_MPC(priv)) {
1038 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1039 return -EINVAL;
1040 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1041 } else {
1042 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1043 return -EINVAL;
1044 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1045 }
1046 dev->mtu = new_mtu;
1047 return 0;
1048}
1049
1050/**
1051 * Returns interface statistics of a device.
1052 *
1053 * dev Pointer to interface struct.
1054 *
1055 * returns Pointer to stats struct of this interface.
1056 */
1057static struct net_device_stats *ctcm_stats(struct net_device *dev)
1058{
1059 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1060}
1061
1062static void ctcm_free_netdevice(struct net_device *dev)
1063{
1064 struct ctcm_priv *priv;
1065 struct mpc_group *grp;
1066
1067 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1068 "%s(%s)", CTCM_FUNTAIL, dev->name);
1069 priv = dev->ml_priv;
1070 if (priv) {
1071 grp = priv->mpcg;
1072 if (grp) {
1073 if (grp->fsm)
1074 kfree_fsm(grp->fsm);
1075 dev_kfree_skb(grp->xid_skb);
1076 dev_kfree_skb(grp->rcvd_xid_skb);
1077 tasklet_kill(&grp->mpc_tasklet2);
1078 kfree(grp);
1079 priv->mpcg = NULL;
1080 }
1081 if (priv->fsm) {
1082 kfree_fsm(priv->fsm);
1083 priv->fsm = NULL;
1084 }
1085 kfree(priv->xid);
1086 priv->xid = NULL;
1087 /*
1088 * Note: kfree(priv); is done in "opposite" function of
1089 * allocator function probe_device which is remove_device.
1090 */
1091 }
1092#ifdef MODULE
1093 free_netdev(dev);
1094#endif
1095}
1096
1097struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1098
1099static const struct net_device_ops ctcm_netdev_ops = {
1100 .ndo_open = ctcm_open,
1101 .ndo_stop = ctcm_close,
1102 .ndo_get_stats = ctcm_stats,
1103 .ndo_change_mtu = ctcm_change_mtu,
1104 .ndo_start_xmit = ctcm_tx,
1105};
1106
1107static const struct net_device_ops ctcm_mpc_netdev_ops = {
1108 .ndo_open = ctcm_open,
1109 .ndo_stop = ctcm_close,
1110 .ndo_get_stats = ctcm_stats,
1111 .ndo_change_mtu = ctcm_change_mtu,
1112 .ndo_start_xmit = ctcmpc_tx,
1113};
1114
1115static void ctcm_dev_setup(struct net_device *dev)
1116{
1117 dev->type = ARPHRD_SLIP;
1118 dev->tx_queue_len = 100;
1119 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1120 dev->min_mtu = 576;
1121 dev->max_mtu = 65527;
1122}
1123
1124/*
1125 * Initialize everything of the net device except the name and the
1126 * channel structs.
1127 */
1128static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1129{
1130 struct net_device *dev;
1131 struct mpc_group *grp;
1132 if (!priv)
1133 return NULL;
1134
1135 if (IS_MPC(priv))
1136 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1137 ctcm_dev_setup);
1138 else
1139 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1140 ctcm_dev_setup);
1141
1142 if (!dev) {
1143 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1144 "%s: MEMORY allocation ERROR",
1145 CTCM_FUNTAIL);
1146 return NULL;
1147 }
1148 dev->ml_priv = priv;
1149 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1150 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1151 dev_fsm, dev_fsm_len, GFP_KERNEL);
1152 if (priv->fsm == NULL) {
1153 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1154 free_netdev(dev);
1155 return NULL;
1156 }
1157 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1158 fsm_settimer(priv->fsm, &priv->restart_timer);
1159
1160 if (IS_MPC(priv)) {
1161 /* MPC Group Initializations */
1162 grp = ctcmpc_init_mpc_group(priv);
1163 if (grp == NULL) {
1164 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1165 free_netdev(dev);
1166 return NULL;
1167 }
1168 tasklet_init(&grp->mpc_tasklet2,
1169 mpc_group_ready, (unsigned long)dev);
1170 dev->mtu = MPC_BUFSIZE_DEFAULT -
1171 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1172
1173 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1174 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1175 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1176 } else {
1177 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1178 dev->netdev_ops = &ctcm_netdev_ops;
1179 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1180 }
1181
1182 CTCMY_DBF_DEV(SETUP, dev, "finished");
1183
1184 return dev;
1185}
1186
1187/**
1188 * Main IRQ handler.
1189 *
1190 * cdev The ccw_device the interrupt is for.
1191 * intparm interruption parameter.
1192 * irb interruption response block.
1193 */
1194static void ctcm_irq_handler(struct ccw_device *cdev,
1195 unsigned long intparm, struct irb *irb)
1196{
1197 struct channel *ch;
1198 struct net_device *dev;
1199 struct ctcm_priv *priv;
1200 struct ccwgroup_device *cgdev;
1201 int cstat;
1202 int dstat;
1203
1204 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1205 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1206
1207 if (ctcm_check_irb_error(cdev, irb))
1208 return;
1209
1210 cgdev = dev_get_drvdata(&cdev->dev);
1211
1212 cstat = irb->scsw.cmd.cstat;
1213 dstat = irb->scsw.cmd.dstat;
1214
1215 /* Check for unsolicited interrupts. */
1216 if (cgdev == NULL) {
1217 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1218 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1219 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1220 dev_warn(&cdev->dev,
1221 "The adapter received a non-specific IRQ\n");
1222 return;
1223 }
1224
1225 priv = dev_get_drvdata(&cgdev->dev);
1226
1227 /* Try to extract channel from driver data. */
1228 if (priv->channel[CTCM_READ]->cdev == cdev)
1229 ch = priv->channel[CTCM_READ];
1230 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1231 ch = priv->channel[CTCM_WRITE];
1232 else {
1233 dev_err(&cdev->dev,
1234 "%s: Internal error: Can't determine channel for "
1235 "interrupt device %s\n",
1236 __func__, dev_name(&cdev->dev));
1237 /* Explain: inconsistent internal structures */
1238 return;
1239 }
1240
1241 dev = ch->netdev;
1242 if (dev == NULL) {
1243 dev_err(&cdev->dev,
1244 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1245 __func__, ch);
1246 /* Explain: inconsistent internal structures */
1247 return;
1248 }
1249
1250 /* Copy interruption response block. */
1251 memcpy(ch->irb, irb, sizeof(struct irb));
1252
1253 /* Issue error message and return on subchannel error code */
1254 if (irb->scsw.cmd.cstat) {
1255 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1256 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1257 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1258 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1259 dev_warn(&cdev->dev,
1260 "A check occurred on the subchannel\n");
1261 return;
1262 }
1263
1264 /* Check the reason-code of a unit check */
1265 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1266 if ((irb->ecw[0] & ch->sense_rc) == 0)
1267 /* print it only once */
1268 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1269 "%s(%s): sense=%02x, ds=%02x",
1270 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1271 ccw_unit_check(ch, irb->ecw[0]);
1272 return;
1273 }
1274 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1275 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1276 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1277 else
1278 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1279 return;
1280 }
1281 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1282 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1283 return;
1284 }
1285 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1286 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1287 (irb->scsw.cmd.stctl ==
1288 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1289 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1290 else
1291 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1292
1293}
1294
1295static const struct device_type ctcm_devtype = {
1296 .name = "ctcm",
1297 .groups = ctcm_attr_groups,
1298};
1299
1300/**
1301 * Add ctcm specific attributes.
1302 * Add ctcm private data.
1303 *
1304 * cgdev pointer to ccwgroup_device just added
1305 *
1306 * returns 0 on success, !0 on failure.
1307 */
1308static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1309{
1310 struct ctcm_priv *priv;
1311
1312 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1313 "%s %p",
1314 __func__, cgdev);
1315
1316 if (!get_device(&cgdev->dev))
1317 return -ENODEV;
1318
1319 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1320 if (!priv) {
1321 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1322 "%s: memory allocation failure",
1323 CTCM_FUNTAIL);
1324 put_device(&cgdev->dev);
1325 return -ENOMEM;
1326 }
1327 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1328 cgdev->cdev[0]->handler = ctcm_irq_handler;
1329 cgdev->cdev[1]->handler = ctcm_irq_handler;
1330 dev_set_drvdata(&cgdev->dev, priv);
1331 cgdev->dev.type = &ctcm_devtype;
1332
1333 return 0;
1334}
1335
1336/**
1337 * Add a new channel to the list of channels.
1338 * Keeps the channel list sorted.
1339 *
1340 * cdev The ccw_device to be added.
1341 * type The type class of the new channel.
1342 * priv Points to the private data of the ccwgroup_device.
1343 *
1344 * returns 0 on success, !0 on error.
1345 */
1346static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1347 struct ctcm_priv *priv)
1348{
1349 struct channel **c = &channels;
1350 struct channel *ch;
1351 int ccw_num;
1352 int rc = 0;
1353
1354 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1355 "%s(%s), type %d, proto %d",
1356 __func__, dev_name(&cdev->dev), type, priv->protocol);
1357
1358 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1359 if (ch == NULL)
1360 return -ENOMEM;
1361
1362 ch->protocol = priv->protocol;
1363 if (IS_MPC(priv)) {
1364 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1365 if (ch->discontact_th == NULL)
1366 goto nomem_return;
1367
1368 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1369 tasklet_init(&ch->ch_disc_tasklet,
1370 mpc_action_send_discontact, (unsigned long)ch);
1371
1372 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1373 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1374 ccw_num = 17;
1375 } else
1376 ccw_num = 8;
1377
1378 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1379 if (ch->ccw == NULL)
1380 goto nomem_return;
1381
1382 ch->cdev = cdev;
1383 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1384 ch->type = type;
1385
1386 /**
1387 * "static" ccws are used in the following way:
1388 *
1389 * ccw[0..2] (Channel program for generic I/O):
1390 * 0: prepare
1391 * 1: read or write (depending on direction) with fixed
1392 * buffer (idal allocated once when buffer is allocated)
1393 * 2: nop
1394 * ccw[3..5] (Channel program for direct write of packets)
1395 * 3: prepare
1396 * 4: write (idal allocated on every write).
1397 * 5: nop
1398 * ccw[6..7] (Channel program for initial channel setup):
1399 * 6: set extended mode
1400 * 7: nop
1401 *
1402 * ch->ccw[0..5] are initialized in ch_action_start because
1403 * the channel's direction is yet unknown here.
1404 *
1405 * ccws used for xid2 negotiations
1406 * ch-ccw[8-14] need to be used for the XID exchange either
1407 * X side XID2 Processing
1408 * 8: write control
1409 * 9: write th
1410 * 10: write XID
1411 * 11: read th from secondary
1412 * 12: read XID from secondary
1413 * 13: read 4 byte ID
1414 * 14: nop
1415 * Y side XID Processing
1416 * 8: sense
1417 * 9: read th
1418 * 10: read XID
1419 * 11: write th
1420 * 12: write XID
1421 * 13: write 4 byte ID
1422 * 14: nop
1423 *
1424 * ccws used for double noop due to VM timing issues
1425 * which result in unrecoverable Busy on channel
1426 * 15: nop
1427 * 16: nop
1428 */
1429 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1430 ch->ccw[6].flags = CCW_FLAG_SLI;
1431
1432 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1433 ch->ccw[7].flags = CCW_FLAG_SLI;
1434
1435 if (IS_MPC(priv)) {
1436 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1437 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1438 ch->ccw[15].count = TH_HEADER_LENGTH;
1439 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1440
1441 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1442 ch->ccw[16].flags = CCW_FLAG_SLI;
1443
1444 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1445 ctc_ch_event_names, CTC_MPC_NR_STATES,
1446 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1447 mpc_ch_fsm_len, GFP_KERNEL);
1448 } else {
1449 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1450 ctc_ch_event_names, CTC_NR_STATES,
1451 CTC_NR_EVENTS, ch_fsm,
1452 ch_fsm_len, GFP_KERNEL);
1453 }
1454 if (ch->fsm == NULL)
1455 goto nomem_return;
1456
1457 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1458
1459 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1460 if (ch->irb == NULL)
1461 goto nomem_return;
1462
1463 while (*c && ctcm_less_than((*c)->id, ch->id))
1464 c = &(*c)->next;
1465
1466 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1467 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1468 "%s (%s) already in list, using old entry",
1469 __func__, (*c)->id);
1470
1471 goto free_return;
1472 }
1473
1474 spin_lock_init(&ch->collect_lock);
1475
1476 fsm_settimer(ch->fsm, &ch->timer);
1477 skb_queue_head_init(&ch->io_queue);
1478 skb_queue_head_init(&ch->collect_queue);
1479
1480 if (IS_MPC(priv)) {
1481 fsm_settimer(ch->fsm, &ch->sweep_timer);
1482 skb_queue_head_init(&ch->sweep_queue);
1483 }
1484 ch->next = *c;
1485 *c = ch;
1486 return 0;
1487
1488nomem_return:
1489 rc = -ENOMEM;
1490
1491free_return: /* note that all channel pointers are 0 or valid */
1492 kfree(ch->ccw);
1493 kfree(ch->discontact_th);
1494 kfree_fsm(ch->fsm);
1495 kfree(ch->irb);
1496 kfree(ch);
1497 return rc;
1498}
1499
1500/*
1501 * Return type of a detected device.
1502 */
1503static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1504{
1505 enum ctcm_channel_types type;
1506 type = (enum ctcm_channel_types)id->driver_info;
1507
1508 if (type == ctcm_channel_type_ficon)
1509 type = ctcm_channel_type_escon;
1510
1511 return type;
1512}
1513
1514/**
1515 *
1516 * Setup an interface.
1517 *
1518 * cgdev Device to be setup.
1519 *
1520 * returns 0 on success, !0 on failure.
1521 */
1522static int ctcm_new_device(struct ccwgroup_device *cgdev)
1523{
1524 char read_id[CTCM_ID_SIZE];
1525 char write_id[CTCM_ID_SIZE];
1526 int direction;
1527 enum ctcm_channel_types type;
1528 struct ctcm_priv *priv;
1529 struct net_device *dev;
1530 struct ccw_device *cdev0;
1531 struct ccw_device *cdev1;
1532 struct channel *readc;
1533 struct channel *writec;
1534 int ret;
1535 int result;
1536
1537 priv = dev_get_drvdata(&cgdev->dev);
1538 if (!priv) {
1539 result = -ENODEV;
1540 goto out_err_result;
1541 }
1542
1543 cdev0 = cgdev->cdev[0];
1544 cdev1 = cgdev->cdev[1];
1545
1546 type = get_channel_type(&cdev0->id);
1547
1548 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1549 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1550
1551 ret = add_channel(cdev0, type, priv);
1552 if (ret) {
1553 result = ret;
1554 goto out_err_result;
1555 }
1556 ret = add_channel(cdev1, type, priv);
1557 if (ret) {
1558 result = ret;
1559 goto out_remove_channel1;
1560 }
1561
1562 ret = ccw_device_set_online(cdev0);
1563 if (ret != 0) {
1564 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1565 "%s(%s) set_online rc=%d",
1566 CTCM_FUNTAIL, read_id, ret);
1567 result = -EIO;
1568 goto out_remove_channel2;
1569 }
1570
1571 ret = ccw_device_set_online(cdev1);
1572 if (ret != 0) {
1573 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1574 "%s(%s) set_online rc=%d",
1575 CTCM_FUNTAIL, write_id, ret);
1576
1577 result = -EIO;
1578 goto out_ccw1;
1579 }
1580
1581 dev = ctcm_init_netdevice(priv);
1582 if (dev == NULL) {
1583 result = -ENODEV;
1584 goto out_ccw2;
1585 }
1586
1587 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1588 priv->channel[direction] =
1589 channel_get(type, direction == CTCM_READ ?
1590 read_id : write_id, direction);
1591 if (priv->channel[direction] == NULL) {
1592 if (direction == CTCM_WRITE)
1593 channel_free(priv->channel[CTCM_READ]);
1594 result = -ENODEV;
1595 goto out_dev;
1596 }
1597 priv->channel[direction]->netdev = dev;
1598 priv->channel[direction]->protocol = priv->protocol;
1599 priv->channel[direction]->max_bufsize = priv->buffer_size;
1600 }
1601 /* sysfs magic */
1602 SET_NETDEV_DEV(dev, &cgdev->dev);
1603
1604 if (register_netdev(dev)) {
1605 result = -ENODEV;
1606 goto out_dev;
1607 }
1608
1609 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1610
1611 dev_info(&dev->dev,
1612 "setup OK : r/w = %s/%s, protocol : %d\n",
1613 priv->channel[CTCM_READ]->id,
1614 priv->channel[CTCM_WRITE]->id, priv->protocol);
1615
1616 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1617 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1618 priv->channel[CTCM_READ]->id,
1619 priv->channel[CTCM_WRITE]->id, priv->protocol);
1620
1621 return 0;
1622out_dev:
1623 ctcm_free_netdevice(dev);
1624out_ccw2:
1625 ccw_device_set_offline(cgdev->cdev[1]);
1626out_ccw1:
1627 ccw_device_set_offline(cgdev->cdev[0]);
1628out_remove_channel2:
1629 readc = channel_get(type, read_id, CTCM_READ);
1630 channel_remove(readc);
1631out_remove_channel1:
1632 writec = channel_get(type, write_id, CTCM_WRITE);
1633 channel_remove(writec);
1634out_err_result:
1635 return result;
1636}
1637
1638/**
1639 * Shutdown an interface.
1640 *
1641 * cgdev Device to be shut down.
1642 *
1643 * returns 0 on success, !0 on failure.
1644 */
1645static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1646{
1647 struct ctcm_priv *priv;
1648 struct net_device *dev;
1649
1650 priv = dev_get_drvdata(&cgdev->dev);
1651 if (!priv)
1652 return -ENODEV;
1653
1654 if (priv->channel[CTCM_READ]) {
1655 dev = priv->channel[CTCM_READ]->netdev;
1656 CTCM_DBF_DEV(SETUP, dev, "");
1657 /* Close the device */
1658 ctcm_close(dev);
1659 dev->flags &= ~IFF_RUNNING;
1660 channel_free(priv->channel[CTCM_READ]);
1661 } else
1662 dev = NULL;
1663
1664 if (priv->channel[CTCM_WRITE])
1665 channel_free(priv->channel[CTCM_WRITE]);
1666
1667 if (dev) {
1668 unregister_netdev(dev);
1669 ctcm_free_netdevice(dev);
1670 }
1671
1672 if (priv->fsm)
1673 kfree_fsm(priv->fsm);
1674
1675 ccw_device_set_offline(cgdev->cdev[1]);
1676 ccw_device_set_offline(cgdev->cdev[0]);
1677 channel_remove(priv->channel[CTCM_READ]);
1678 channel_remove(priv->channel[CTCM_WRITE]);
1679 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1680
1681 return 0;
1682
1683}
1684
1685
1686static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1687{
1688 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1689
1690 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1691 "removing device %p, proto : %d",
1692 cgdev, priv->protocol);
1693
1694 if (cgdev->state == CCWGROUP_ONLINE)
1695 ctcm_shutdown_device(cgdev);
1696 dev_set_drvdata(&cgdev->dev, NULL);
1697 kfree(priv);
1698 put_device(&cgdev->dev);
1699}
1700
1701static struct ccw_device_id ctcm_ids[] = {
1702 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1703 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1704 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1705 {},
1706};
1707MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1708
1709static struct ccw_driver ctcm_ccw_driver = {
1710 .driver = {
1711 .owner = THIS_MODULE,
1712 .name = "ctcm",
1713 },
1714 .ids = ctcm_ids,
1715 .probe = ccwgroup_probe_ccwdev,
1716 .remove = ccwgroup_remove_ccwdev,
1717 .int_class = IRQIO_CTC,
1718};
1719
1720static struct ccwgroup_driver ctcm_group_driver = {
1721 .driver = {
1722 .owner = THIS_MODULE,
1723 .name = CTC_DRIVER_NAME,
1724 },
1725 .ccw_driver = &ctcm_ccw_driver,
1726 .setup = ctcm_probe_device,
1727 .remove = ctcm_remove_device,
1728 .set_online = ctcm_new_device,
1729 .set_offline = ctcm_shutdown_device,
1730};
1731
1732static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1733 size_t count)
1734{
1735 int err;
1736
1737 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1738 return err ? err : count;
1739}
1740static DRIVER_ATTR_WO(group);
1741
1742static struct attribute *ctcm_drv_attrs[] = {
1743 &driver_attr_group.attr,
1744 NULL,
1745};
1746static struct attribute_group ctcm_drv_attr_group = {
1747 .attrs = ctcm_drv_attrs,
1748};
1749static const struct attribute_group *ctcm_drv_attr_groups[] = {
1750 &ctcm_drv_attr_group,
1751 NULL,
1752};
1753
1754/*
1755 * Module related routines
1756 */
1757
1758/*
1759 * Prepare to be unloaded. Free IRQ's and release all resources.
1760 * This is called just before this module is unloaded. It is
1761 * not called, if the usage count is !0, so we don't need to check
1762 * for that.
1763 */
1764static void __exit ctcm_exit(void)
1765{
1766 ccwgroup_driver_unregister(&ctcm_group_driver);
1767 ccw_driver_unregister(&ctcm_ccw_driver);
1768 root_device_unregister(ctcm_root_dev);
1769 ctcm_unregister_dbf_views();
1770 pr_info("CTCM driver unloaded\n");
1771}
1772
1773/*
1774 * Print Banner.
1775 */
1776static void print_banner(void)
1777{
1778 pr_info("CTCM driver initialized\n");
1779}
1780
1781/**
1782 * Initialize module.
1783 * This is called just after the module is loaded.
1784 *
1785 * returns 0 on success, !0 on error.
1786 */
1787static int __init ctcm_init(void)
1788{
1789 int ret;
1790
1791 channels = NULL;
1792
1793 ret = ctcm_register_dbf_views();
1794 if (ret)
1795 goto out_err;
1796 ctcm_root_dev = root_device_register("ctcm");
1797 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1798 if (ret)
1799 goto register_err;
1800 ret = ccw_driver_register(&ctcm_ccw_driver);
1801 if (ret)
1802 goto ccw_err;
1803 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1804 ret = ccwgroup_driver_register(&ctcm_group_driver);
1805 if (ret)
1806 goto ccwgroup_err;
1807 print_banner();
1808 return 0;
1809
1810ccwgroup_err:
1811 ccw_driver_unregister(&ctcm_ccw_driver);
1812ccw_err:
1813 root_device_unregister(ctcm_root_dev);
1814register_err:
1815 ctcm_unregister_dbf_views();
1816out_err:
1817 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1818 __func__, ret);
1819 return ret;
1820}
1821
1822module_init(ctcm_init);
1823module_exit(ctcm_exit);
1824
1825MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1826MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1827MODULE_LICENSE("GPL");
1828
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 = current_kernel_time(); /* xtime */
571 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572 (unsigned long)ch, 0xff, 0);
573 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574 if (ccw_idx == 3)
575 ch->prof.doios_single++;
576 if (rc != 0) {
577 fsm_deltimer(&ch->timer);
578 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579 if (ccw_idx == 3)
580 skb_dequeue_tail(&ch->io_queue);
581 /*
582 * Remove our header. It gets added
583 * again on retransmit.
584 */
585 skb_pull(skb, LL_HEADER_LENGTH + 2);
586 } else if (ccw_idx == 0) {
587 struct net_device *dev = ch->netdev;
588 struct ctcm_priv *priv = dev->ml_priv;
589 priv->stats.tx_packets++;
590 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591 }
592done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595}
596
597static void ctcmpc_send_sweep_req(struct channel *rch)
598{
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
605 /* int rc = 0; */
606
607 priv = dev->ml_priv;
608 grp = priv->mpcg;
609 ch = priv->channel[CTCM_WRITE];
610
611 /* sweep processing is not complete until response and request */
612 /* has completed for all read channels in group */
613 if (grp->in_sweep == 0) {
614 grp->in_sweep = 1;
615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
622 /* rc = -ENOMEM; */
623 goto nomem;
624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 dev->trans_start = jiffies;
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
652nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657 return;
658}
659
660/*
661 * MPC mode version of transmit_skb
662 */
663static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664{
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
667 struct ctcm_priv *priv = dev->ml_priv;
668 struct mpc_group *grp = priv->mpcg;
669 struct th_header *header;
670 struct sk_buff *nskb;
671 int rc = 0;
672 int ccw_idx;
673 unsigned long hi;
674 unsigned long saveflags = 0; /* avoids compiler warning */
675
676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 atomic_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
687 goto nomem_exit;
688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (skb->protocol == ntohs(ETH_P_SNAP)) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 atomic_inc(&skb->users);
720
721 /*
722 * IDAL support in CTCM is broken, so we have to
723 * care about skb's above 2G ourselves.
724 */
725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726 if (hi) {
727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728 if (!nskb) {
729 goto nomem_exit;
730 } else {
731 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
732 atomic_inc(&nskb->users);
733 atomic_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741 if (!p_header)
742 goto nomem_exit;
743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (skb->protocol == ntohs(ETH_P_SNAP)) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772 if (!header)
773 goto nomem_exit;
774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
803 * Remove our header.
804 * It gets added again on retransmit.
805 */
806 goto nomem_exit;
807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
813 atomic_dec(&skb->users);
814 dev_kfree_skb_irq(skb);
815 ccw_idx = 0;
816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817 "up to 32 bytes sent to vtam:\n",
818 __func__, dev->name, ch->trans_skb->len);
819 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820 min_t(int, 32, ch->trans_skb->len));
821 } else {
822 skb_queue_tail(&ch->io_queue, skb);
823 ccw_idx = 3;
824 }
825 ch->retry = 0;
826 fsm_newstate(ch->fsm, CTC_STATE_TX);
827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829 if (do_debug_ccw)
830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831 sizeof(struct ccw1) * 3);
832
833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834 ch->prof.send_stamp = current_kernel_time(); /* xtime */
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836 (unsigned long)ch, 0xff, 0);
837 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838 if (ccw_idx == 3)
839 ch->prof.doios_single++;
840 if (rc != 0) {
841 fsm_deltimer(&ch->timer);
842 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843 if (ccw_idx == 3)
844 skb_dequeue_tail(&ch->io_queue);
845 } else if (ccw_idx == 0) {
846 priv->stats.tx_packets++;
847 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848 }
849 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
850 ctcmpc_send_sweep_req(ch);
851
852 goto done;
853nomem_exit:
854 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855 "%s(%s): MEMORY allocation ERROR\n",
856 CTCM_FUNTAIL, ch->id);
857 rc = -ENOMEM;
858 atomic_dec(&skb->users);
859 dev_kfree_skb_any(skb);
860 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
861done:
862 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
863 return rc;
864}
865
866/**
867 * Start transmission of a packet.
868 * Called from generic network device layer.
869 *
870 * skb Pointer to buffer containing the packet.
871 * dev Pointer to interface struct.
872 *
873 * returns 0 if packet consumed, !0 if packet rejected.
874 * Note: If we return !0, then the packet is free'd by
875 * the generic network layer.
876 */
877/* first merge version - leaving both functions separated */
878static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
879{
880 struct ctcm_priv *priv = dev->ml_priv;
881
882 if (skb == NULL) {
883 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
884 "%s(%s): NULL sk_buff passed",
885 CTCM_FUNTAIL, dev->name);
886 priv->stats.tx_dropped++;
887 return NETDEV_TX_OK;
888 }
889 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
890 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891 "%s(%s): Got sk_buff with head room < %ld bytes",
892 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
893 dev_kfree_skb(skb);
894 priv->stats.tx_dropped++;
895 return NETDEV_TX_OK;
896 }
897
898 /*
899 * If channels are not running, try to restart them
900 * and throw away packet.
901 */
902 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
903 fsm_event(priv->fsm, DEV_EVENT_START, dev);
904 dev_kfree_skb(skb);
905 priv->stats.tx_dropped++;
906 priv->stats.tx_errors++;
907 priv->stats.tx_carrier_errors++;
908 return NETDEV_TX_OK;
909 }
910
911 if (ctcm_test_and_set_busy(dev))
912 return NETDEV_TX_BUSY;
913
914 dev->trans_start = jiffies;
915 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
916 return NETDEV_TX_BUSY;
917 return NETDEV_TX_OK;
918}
919
920/* unmerged MPC variant of ctcm_tx */
921static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
922{
923 int len = 0;
924 struct ctcm_priv *priv = dev->ml_priv;
925 struct mpc_group *grp = priv->mpcg;
926 struct sk_buff *newskb = NULL;
927
928 /*
929 * Some sanity checks ...
930 */
931 if (skb == NULL) {
932 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933 "%s(%s): NULL sk_buff passed",
934 CTCM_FUNTAIL, dev->name);
935 priv->stats.tx_dropped++;
936 goto done;
937 }
938 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
939 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
940 "%s(%s): Got sk_buff with head room < %ld bytes",
941 CTCM_FUNTAIL, dev->name,
942 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
943
944 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
945
946 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
947 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
948
949 if (!newskb) {
950 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
951 "%s: %s: __dev_alloc_skb failed",
952 __func__, dev->name);
953
954 dev_kfree_skb_any(skb);
955 priv->stats.tx_dropped++;
956 priv->stats.tx_errors++;
957 priv->stats.tx_carrier_errors++;
958 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
959 goto done;
960 }
961 newskb->protocol = skb->protocol;
962 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
963 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
964 dev_kfree_skb_any(skb);
965 skb = newskb;
966 }
967
968 /*
969 * If channels are not running,
970 * notify anybody about a link failure and throw
971 * away packet.
972 */
973 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
974 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
975 dev_kfree_skb_any(skb);
976 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
977 "%s(%s): inactive MPCGROUP - dropped",
978 CTCM_FUNTAIL, dev->name);
979 priv->stats.tx_dropped++;
980 priv->stats.tx_errors++;
981 priv->stats.tx_carrier_errors++;
982 goto done;
983 }
984
985 if (ctcm_test_and_set_busy(dev)) {
986 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
987 "%s(%s): device busy - dropped",
988 CTCM_FUNTAIL, dev->name);
989 dev_kfree_skb_any(skb);
990 priv->stats.tx_dropped++;
991 priv->stats.tx_errors++;
992 priv->stats.tx_carrier_errors++;
993 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
994 goto done;
995 }
996
997 dev->trans_start = jiffies;
998 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
999 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000 "%s(%s): device error - dropped",
1001 CTCM_FUNTAIL, dev->name);
1002 dev_kfree_skb_any(skb);
1003 priv->stats.tx_dropped++;
1004 priv->stats.tx_errors++;
1005 priv->stats.tx_carrier_errors++;
1006 ctcm_clear_busy(dev);
1007 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008 goto done;
1009 }
1010 ctcm_clear_busy(dev);
1011done:
1012 if (do_debug)
1013 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
1015 return NETDEV_TX_OK; /* handle freeing of skb here */
1016}
1017
1018
1019/**
1020 * Sets MTU of an interface.
1021 *
1022 * dev Pointer to interface struct.
1023 * new_mtu The new MTU to use for this interface.
1024 *
1025 * returns 0 on success, -EINVAL if MTU is out of valid range.
1026 * (valid range is 576 .. 65527). If VM is on the
1027 * remote side, maximum MTU is 32760, however this is
1028 * not checked here.
1029 */
1030static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031{
1032 struct ctcm_priv *priv;
1033 int max_bufsize;
1034
1035 if (new_mtu < 576 || new_mtu > 65527)
1036 return -EINVAL;
1037
1038 priv = dev->ml_priv;
1039 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1040
1041 if (IS_MPC(priv)) {
1042 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043 return -EINVAL;
1044 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045 } else {
1046 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047 return -EINVAL;
1048 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049 }
1050 dev->mtu = new_mtu;
1051 return 0;
1052}
1053
1054/**
1055 * Returns interface statistics of a device.
1056 *
1057 * dev Pointer to interface struct.
1058 *
1059 * returns Pointer to stats struct of this interface.
1060 */
1061static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062{
1063 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1064}
1065
1066static void ctcm_free_netdevice(struct net_device *dev)
1067{
1068 struct ctcm_priv *priv;
1069 struct mpc_group *grp;
1070
1071 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072 "%s(%s)", CTCM_FUNTAIL, dev->name);
1073 priv = dev->ml_priv;
1074 if (priv) {
1075 grp = priv->mpcg;
1076 if (grp) {
1077 if (grp->fsm)
1078 kfree_fsm(grp->fsm);
1079 if (grp->xid_skb)
1080 dev_kfree_skb(grp->xid_skb);
1081 if (grp->rcvd_xid_skb)
1082 dev_kfree_skb(grp->rcvd_xid_skb);
1083 tasklet_kill(&grp->mpc_tasklet2);
1084 kfree(grp);
1085 priv->mpcg = NULL;
1086 }
1087 if (priv->fsm) {
1088 kfree_fsm(priv->fsm);
1089 priv->fsm = NULL;
1090 }
1091 kfree(priv->xid);
1092 priv->xid = NULL;
1093 /*
1094 * Note: kfree(priv); is done in "opposite" function of
1095 * allocator function probe_device which is remove_device.
1096 */
1097 }
1098#ifdef MODULE
1099 free_netdev(dev);
1100#endif
1101}
1102
1103struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
1105static const struct net_device_ops ctcm_netdev_ops = {
1106 .ndo_open = ctcm_open,
1107 .ndo_stop = ctcm_close,
1108 .ndo_get_stats = ctcm_stats,
1109 .ndo_change_mtu = ctcm_change_mtu,
1110 .ndo_start_xmit = ctcm_tx,
1111};
1112
1113static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114 .ndo_open = ctcm_open,
1115 .ndo_stop = ctcm_close,
1116 .ndo_get_stats = ctcm_stats,
1117 .ndo_change_mtu = ctcm_change_mtu,
1118 .ndo_start_xmit = ctcmpc_tx,
1119};
1120
1121void static ctcm_dev_setup(struct net_device *dev)
1122{
1123 dev->type = ARPHRD_SLIP;
1124 dev->tx_queue_len = 100;
1125 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126}
1127
1128/*
1129 * Initialize everything of the net device except the name and the
1130 * channel structs.
1131 */
1132static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133{
1134 struct net_device *dev;
1135 struct mpc_group *grp;
1136 if (!priv)
1137 return NULL;
1138
1139 if (IS_MPC(priv))
1140 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1141 else
1142 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1143
1144 if (!dev) {
1145 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1146 "%s: MEMORY allocation ERROR",
1147 CTCM_FUNTAIL);
1148 return NULL;
1149 }
1150 dev->ml_priv = priv;
1151 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1152 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1153 dev_fsm, dev_fsm_len, GFP_KERNEL);
1154 if (priv->fsm == NULL) {
1155 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1156 free_netdev(dev);
1157 return NULL;
1158 }
1159 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1160 fsm_settimer(priv->fsm, &priv->restart_timer);
1161
1162 if (IS_MPC(priv)) {
1163 /* MPC Group Initializations */
1164 grp = ctcmpc_init_mpc_group(priv);
1165 if (grp == NULL) {
1166 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1167 free_netdev(dev);
1168 return NULL;
1169 }
1170 tasklet_init(&grp->mpc_tasklet2,
1171 mpc_group_ready, (unsigned long)dev);
1172 dev->mtu = MPC_BUFSIZE_DEFAULT -
1173 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1174
1175 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1176 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1177 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1178 } else {
1179 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1180 dev->netdev_ops = &ctcm_netdev_ops;
1181 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1182 }
1183
1184 CTCMY_DBF_DEV(SETUP, dev, "finished");
1185
1186 return dev;
1187}
1188
1189/**
1190 * Main IRQ handler.
1191 *
1192 * cdev The ccw_device the interrupt is for.
1193 * intparm interruption parameter.
1194 * irb interruption response block.
1195 */
1196static void ctcm_irq_handler(struct ccw_device *cdev,
1197 unsigned long intparm, struct irb *irb)
1198{
1199 struct channel *ch;
1200 struct net_device *dev;
1201 struct ctcm_priv *priv;
1202 struct ccwgroup_device *cgdev;
1203 int cstat;
1204 int dstat;
1205
1206 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1207 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1208
1209 if (ctcm_check_irb_error(cdev, irb))
1210 return;
1211
1212 cgdev = dev_get_drvdata(&cdev->dev);
1213
1214 cstat = irb->scsw.cmd.cstat;
1215 dstat = irb->scsw.cmd.dstat;
1216
1217 /* Check for unsolicited interrupts. */
1218 if (cgdev == NULL) {
1219 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1220 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1221 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1222 dev_warn(&cdev->dev,
1223 "The adapter received a non-specific IRQ\n");
1224 return;
1225 }
1226
1227 priv = dev_get_drvdata(&cgdev->dev);
1228
1229 /* Try to extract channel from driver data. */
1230 if (priv->channel[CTCM_READ]->cdev == cdev)
1231 ch = priv->channel[CTCM_READ];
1232 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1233 ch = priv->channel[CTCM_WRITE];
1234 else {
1235 dev_err(&cdev->dev,
1236 "%s: Internal error: Can't determine channel for "
1237 "interrupt device %s\n",
1238 __func__, dev_name(&cdev->dev));
1239 /* Explain: inconsistent internal structures */
1240 return;
1241 }
1242
1243 dev = ch->netdev;
1244 if (dev == NULL) {
1245 dev_err(&cdev->dev,
1246 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1247 __func__, ch);
1248 /* Explain: inconsistent internal structures */
1249 return;
1250 }
1251
1252 /* Copy interruption response block. */
1253 memcpy(ch->irb, irb, sizeof(struct irb));
1254
1255 /* Issue error message and return on subchannel error code */
1256 if (irb->scsw.cmd.cstat) {
1257 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1258 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1259 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1260 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1261 dev_warn(&cdev->dev,
1262 "A check occurred on the subchannel\n");
1263 return;
1264 }
1265
1266 /* Check the reason-code of a unit check */
1267 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1268 if ((irb->ecw[0] & ch->sense_rc) == 0)
1269 /* print it only once */
1270 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1271 "%s(%s): sense=%02x, ds=%02x",
1272 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1273 ccw_unit_check(ch, irb->ecw[0]);
1274 return;
1275 }
1276 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1277 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1278 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1279 else
1280 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1281 return;
1282 }
1283 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1284 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1285 return;
1286 }
1287 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1288 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1289 (irb->scsw.cmd.stctl ==
1290 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1291 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1292 else
1293 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1294
1295}
1296
1297static const struct device_type ctcm_devtype = {
1298 .name = "ctcm",
1299 .groups = ctcm_attr_groups,
1300};
1301
1302/**
1303 * Add ctcm specific attributes.
1304 * Add ctcm private data.
1305 *
1306 * cgdev pointer to ccwgroup_device just added
1307 *
1308 * returns 0 on success, !0 on failure.
1309 */
1310static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1311{
1312 struct ctcm_priv *priv;
1313
1314 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1315 "%s %p",
1316 __func__, cgdev);
1317
1318 if (!get_device(&cgdev->dev))
1319 return -ENODEV;
1320
1321 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1322 if (!priv) {
1323 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1324 "%s: memory allocation failure",
1325 CTCM_FUNTAIL);
1326 put_device(&cgdev->dev);
1327 return -ENOMEM;
1328 }
1329 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1330 cgdev->cdev[0]->handler = ctcm_irq_handler;
1331 cgdev->cdev[1]->handler = ctcm_irq_handler;
1332 dev_set_drvdata(&cgdev->dev, priv);
1333 cgdev->dev.type = &ctcm_devtype;
1334
1335 return 0;
1336}
1337
1338/**
1339 * Add a new channel to the list of channels.
1340 * Keeps the channel list sorted.
1341 *
1342 * cdev The ccw_device to be added.
1343 * type The type class of the new channel.
1344 * priv Points to the private data of the ccwgroup_device.
1345 *
1346 * returns 0 on success, !0 on error.
1347 */
1348static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1349 struct ctcm_priv *priv)
1350{
1351 struct channel **c = &channels;
1352 struct channel *ch;
1353 int ccw_num;
1354 int rc = 0;
1355
1356 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1357 "%s(%s), type %d, proto %d",
1358 __func__, dev_name(&cdev->dev), type, priv->protocol);
1359
1360 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1361 if (ch == NULL)
1362 return -ENOMEM;
1363
1364 ch->protocol = priv->protocol;
1365 if (IS_MPC(priv)) {
1366 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1367 if (ch->discontact_th == NULL)
1368 goto nomem_return;
1369
1370 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1371 tasklet_init(&ch->ch_disc_tasklet,
1372 mpc_action_send_discontact, (unsigned long)ch);
1373
1374 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1375 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1376 ccw_num = 17;
1377 } else
1378 ccw_num = 8;
1379
1380 ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1381 if (ch->ccw == NULL)
1382 goto nomem_return;
1383
1384 ch->cdev = cdev;
1385 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1386 ch->type = type;
1387
1388 /**
1389 * "static" ccws are used in the following way:
1390 *
1391 * ccw[0..2] (Channel program for generic I/O):
1392 * 0: prepare
1393 * 1: read or write (depending on direction) with fixed
1394 * buffer (idal allocated once when buffer is allocated)
1395 * 2: nop
1396 * ccw[3..5] (Channel program for direct write of packets)
1397 * 3: prepare
1398 * 4: write (idal allocated on every write).
1399 * 5: nop
1400 * ccw[6..7] (Channel program for initial channel setup):
1401 * 6: set extended mode
1402 * 7: nop
1403 *
1404 * ch->ccw[0..5] are initialized in ch_action_start because
1405 * the channel's direction is yet unknown here.
1406 *
1407 * ccws used for xid2 negotiations
1408 * ch-ccw[8-14] need to be used for the XID exchange either
1409 * X side XID2 Processing
1410 * 8: write control
1411 * 9: write th
1412 * 10: write XID
1413 * 11: read th from secondary
1414 * 12: read XID from secondary
1415 * 13: read 4 byte ID
1416 * 14: nop
1417 * Y side XID Processing
1418 * 8: sense
1419 * 9: read th
1420 * 10: read XID
1421 * 11: write th
1422 * 12: write XID
1423 * 13: write 4 byte ID
1424 * 14: nop
1425 *
1426 * ccws used for double noop due to VM timing issues
1427 * which result in unrecoverable Busy on channel
1428 * 15: nop
1429 * 16: nop
1430 */
1431 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1432 ch->ccw[6].flags = CCW_FLAG_SLI;
1433
1434 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1435 ch->ccw[7].flags = CCW_FLAG_SLI;
1436
1437 if (IS_MPC(priv)) {
1438 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1439 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1440 ch->ccw[15].count = TH_HEADER_LENGTH;
1441 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1442
1443 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1444 ch->ccw[16].flags = CCW_FLAG_SLI;
1445
1446 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1447 ctc_ch_event_names, CTC_MPC_NR_STATES,
1448 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1449 mpc_ch_fsm_len, GFP_KERNEL);
1450 } else {
1451 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1452 ctc_ch_event_names, CTC_NR_STATES,
1453 CTC_NR_EVENTS, ch_fsm,
1454 ch_fsm_len, GFP_KERNEL);
1455 }
1456 if (ch->fsm == NULL)
1457 goto nomem_return;
1458
1459 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1460
1461 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1462 if (ch->irb == NULL)
1463 goto nomem_return;
1464
1465 while (*c && ctcm_less_than((*c)->id, ch->id))
1466 c = &(*c)->next;
1467
1468 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1469 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1470 "%s (%s) already in list, using old entry",
1471 __func__, (*c)->id);
1472
1473 goto free_return;
1474 }
1475
1476 spin_lock_init(&ch->collect_lock);
1477
1478 fsm_settimer(ch->fsm, &ch->timer);
1479 skb_queue_head_init(&ch->io_queue);
1480 skb_queue_head_init(&ch->collect_queue);
1481
1482 if (IS_MPC(priv)) {
1483 fsm_settimer(ch->fsm, &ch->sweep_timer);
1484 skb_queue_head_init(&ch->sweep_queue);
1485 }
1486 ch->next = *c;
1487 *c = ch;
1488 return 0;
1489
1490nomem_return:
1491 rc = -ENOMEM;
1492
1493free_return: /* note that all channel pointers are 0 or valid */
1494 kfree(ch->ccw);
1495 kfree(ch->discontact_th);
1496 kfree_fsm(ch->fsm);
1497 kfree(ch->irb);
1498 kfree(ch);
1499 return rc;
1500}
1501
1502/*
1503 * Return type of a detected device.
1504 */
1505static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1506{
1507 enum ctcm_channel_types type;
1508 type = (enum ctcm_channel_types)id->driver_info;
1509
1510 if (type == ctcm_channel_type_ficon)
1511 type = ctcm_channel_type_escon;
1512
1513 return type;
1514}
1515
1516/**
1517 *
1518 * Setup an interface.
1519 *
1520 * cgdev Device to be setup.
1521 *
1522 * returns 0 on success, !0 on failure.
1523 */
1524static int ctcm_new_device(struct ccwgroup_device *cgdev)
1525{
1526 char read_id[CTCM_ID_SIZE];
1527 char write_id[CTCM_ID_SIZE];
1528 int direction;
1529 enum ctcm_channel_types type;
1530 struct ctcm_priv *priv;
1531 struct net_device *dev;
1532 struct ccw_device *cdev0;
1533 struct ccw_device *cdev1;
1534 struct channel *readc;
1535 struct channel *writec;
1536 int ret;
1537 int result;
1538
1539 priv = dev_get_drvdata(&cgdev->dev);
1540 if (!priv) {
1541 result = -ENODEV;
1542 goto out_err_result;
1543 }
1544
1545 cdev0 = cgdev->cdev[0];
1546 cdev1 = cgdev->cdev[1];
1547
1548 type = get_channel_type(&cdev0->id);
1549
1550 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1551 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1552
1553 ret = add_channel(cdev0, type, priv);
1554 if (ret) {
1555 result = ret;
1556 goto out_err_result;
1557 }
1558 ret = add_channel(cdev1, type, priv);
1559 if (ret) {
1560 result = ret;
1561 goto out_remove_channel1;
1562 }
1563
1564 ret = ccw_device_set_online(cdev0);
1565 if (ret != 0) {
1566 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1567 "%s(%s) set_online rc=%d",
1568 CTCM_FUNTAIL, read_id, ret);
1569 result = -EIO;
1570 goto out_remove_channel2;
1571 }
1572
1573 ret = ccw_device_set_online(cdev1);
1574 if (ret != 0) {
1575 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1576 "%s(%s) set_online rc=%d",
1577 CTCM_FUNTAIL, write_id, ret);
1578
1579 result = -EIO;
1580 goto out_ccw1;
1581 }
1582
1583 dev = ctcm_init_netdevice(priv);
1584 if (dev == NULL) {
1585 result = -ENODEV;
1586 goto out_ccw2;
1587 }
1588
1589 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1590 priv->channel[direction] =
1591 channel_get(type, direction == CTCM_READ ?
1592 read_id : write_id, direction);
1593 if (priv->channel[direction] == NULL) {
1594 if (direction == CTCM_WRITE)
1595 channel_free(priv->channel[CTCM_READ]);
1596 goto out_dev;
1597 }
1598 priv->channel[direction]->netdev = dev;
1599 priv->channel[direction]->protocol = priv->protocol;
1600 priv->channel[direction]->max_bufsize = priv->buffer_size;
1601 }
1602 /* sysfs magic */
1603 SET_NETDEV_DEV(dev, &cgdev->dev);
1604
1605 if (register_netdev(dev)) {
1606 result = -ENODEV;
1607 goto out_dev;
1608 }
1609
1610 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1611
1612 dev_info(&dev->dev,
1613 "setup OK : r/w = %s/%s, protocol : %d\n",
1614 priv->channel[CTCM_READ]->id,
1615 priv->channel[CTCM_WRITE]->id, priv->protocol);
1616
1617 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1618 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1619 priv->channel[CTCM_READ]->id,
1620 priv->channel[CTCM_WRITE]->id, priv->protocol);
1621
1622 return 0;
1623out_dev:
1624 ctcm_free_netdevice(dev);
1625out_ccw2:
1626 ccw_device_set_offline(cgdev->cdev[1]);
1627out_ccw1:
1628 ccw_device_set_offline(cgdev->cdev[0]);
1629out_remove_channel2:
1630 readc = channel_get(type, read_id, CTCM_READ);
1631 channel_remove(readc);
1632out_remove_channel1:
1633 writec = channel_get(type, write_id, CTCM_WRITE);
1634 channel_remove(writec);
1635out_err_result:
1636 return result;
1637}
1638
1639/**
1640 * Shutdown an interface.
1641 *
1642 * cgdev Device to be shut down.
1643 *
1644 * returns 0 on success, !0 on failure.
1645 */
1646static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1647{
1648 struct ctcm_priv *priv;
1649 struct net_device *dev;
1650
1651 priv = dev_get_drvdata(&cgdev->dev);
1652 if (!priv)
1653 return -ENODEV;
1654
1655 if (priv->channel[CTCM_READ]) {
1656 dev = priv->channel[CTCM_READ]->netdev;
1657 CTCM_DBF_DEV(SETUP, dev, "");
1658 /* Close the device */
1659 ctcm_close(dev);
1660 dev->flags &= ~IFF_RUNNING;
1661 channel_free(priv->channel[CTCM_READ]);
1662 } else
1663 dev = NULL;
1664
1665 if (priv->channel[CTCM_WRITE])
1666 channel_free(priv->channel[CTCM_WRITE]);
1667
1668 if (dev) {
1669 unregister_netdev(dev);
1670 ctcm_free_netdevice(dev);
1671 }
1672
1673 if (priv->fsm)
1674 kfree_fsm(priv->fsm);
1675
1676 ccw_device_set_offline(cgdev->cdev[1]);
1677 ccw_device_set_offline(cgdev->cdev[0]);
1678
1679 if (priv->channel[CTCM_READ])
1680 channel_remove(priv->channel[CTCM_READ]);
1681 if (priv->channel[CTCM_WRITE])
1682 channel_remove(priv->channel[CTCM_WRITE]);
1683 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1684
1685 return 0;
1686
1687}
1688
1689
1690static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1691{
1692 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1693
1694 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1695 "removing device %p, proto : %d",
1696 cgdev, priv->protocol);
1697
1698 if (cgdev->state == CCWGROUP_ONLINE)
1699 ctcm_shutdown_device(cgdev);
1700 dev_set_drvdata(&cgdev->dev, NULL);
1701 kfree(priv);
1702 put_device(&cgdev->dev);
1703}
1704
1705static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1706{
1707 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1708
1709 if (gdev->state == CCWGROUP_OFFLINE)
1710 return 0;
1711 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1712 ctcm_close(priv->channel[CTCM_READ]->netdev);
1713 if (!wait_event_timeout(priv->fsm->wait_q,
1714 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1715 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1716 return -EBUSY;
1717 }
1718 ccw_device_set_offline(gdev->cdev[1]);
1719 ccw_device_set_offline(gdev->cdev[0]);
1720 return 0;
1721}
1722
1723static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1724{
1725 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1726 int rc;
1727
1728 if (gdev->state == CCWGROUP_OFFLINE)
1729 return 0;
1730 rc = ccw_device_set_online(gdev->cdev[1]);
1731 if (rc)
1732 goto err_out;
1733 rc = ccw_device_set_online(gdev->cdev[0]);
1734 if (rc)
1735 goto err_out;
1736 ctcm_open(priv->channel[CTCM_READ]->netdev);
1737err_out:
1738 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1739 return rc;
1740}
1741
1742static struct ccw_device_id ctcm_ids[] = {
1743 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1744 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1745 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1746 {},
1747};
1748MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1749
1750static struct ccw_driver ctcm_ccw_driver = {
1751 .driver = {
1752 .owner = THIS_MODULE,
1753 .name = "ctcm",
1754 },
1755 .ids = ctcm_ids,
1756 .probe = ccwgroup_probe_ccwdev,
1757 .remove = ccwgroup_remove_ccwdev,
1758 .int_class = IRQIO_CTC,
1759};
1760
1761static struct ccwgroup_driver ctcm_group_driver = {
1762 .driver = {
1763 .owner = THIS_MODULE,
1764 .name = CTC_DRIVER_NAME,
1765 },
1766 .setup = ctcm_probe_device,
1767 .remove = ctcm_remove_device,
1768 .set_online = ctcm_new_device,
1769 .set_offline = ctcm_shutdown_device,
1770 .freeze = ctcm_pm_suspend,
1771 .thaw = ctcm_pm_resume,
1772 .restore = ctcm_pm_resume,
1773};
1774
1775static ssize_t ctcm_driver_group_store(struct device_driver *ddrv,
1776 const char *buf, size_t count)
1777{
1778 int err;
1779
1780 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1781 return err ? err : count;
1782}
1783static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1784
1785static struct attribute *ctcm_drv_attrs[] = {
1786 &driver_attr_group.attr,
1787 NULL,
1788};
1789static struct attribute_group ctcm_drv_attr_group = {
1790 .attrs = ctcm_drv_attrs,
1791};
1792static const struct attribute_group *ctcm_drv_attr_groups[] = {
1793 &ctcm_drv_attr_group,
1794 NULL,
1795};
1796
1797/*
1798 * Module related routines
1799 */
1800
1801/*
1802 * Prepare to be unloaded. Free IRQ's and release all resources.
1803 * This is called just before this module is unloaded. It is
1804 * not called, if the usage count is !0, so we don't need to check
1805 * for that.
1806 */
1807static void __exit ctcm_exit(void)
1808{
1809 ccwgroup_driver_unregister(&ctcm_group_driver);
1810 ccw_driver_unregister(&ctcm_ccw_driver);
1811 root_device_unregister(ctcm_root_dev);
1812 ctcm_unregister_dbf_views();
1813 pr_info("CTCM driver unloaded\n");
1814}
1815
1816/*
1817 * Print Banner.
1818 */
1819static void print_banner(void)
1820{
1821 pr_info("CTCM driver initialized\n");
1822}
1823
1824/**
1825 * Initialize module.
1826 * This is called just after the module is loaded.
1827 *
1828 * returns 0 on success, !0 on error.
1829 */
1830static int __init ctcm_init(void)
1831{
1832 int ret;
1833
1834 channels = NULL;
1835
1836 ret = ctcm_register_dbf_views();
1837 if (ret)
1838 goto out_err;
1839 ctcm_root_dev = root_device_register("ctcm");
1840 ret = PTR_RET(ctcm_root_dev);
1841 if (ret)
1842 goto register_err;
1843 ret = ccw_driver_register(&ctcm_ccw_driver);
1844 if (ret)
1845 goto ccw_err;
1846 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1847 ret = ccwgroup_driver_register(&ctcm_group_driver);
1848 if (ret)
1849 goto ccwgroup_err;
1850 print_banner();
1851 return 0;
1852
1853ccwgroup_err:
1854 ccw_driver_unregister(&ctcm_ccw_driver);
1855ccw_err:
1856 root_device_unregister(ctcm_root_dev);
1857register_err:
1858 ctcm_unregister_dbf_views();
1859out_err:
1860 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1861 __func__, ret);
1862 return ret;
1863}
1864
1865module_init(ctcm_init);
1866module_exit(ctcm_exit);
1867
1868MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1869MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1870MODULE_LICENSE("GPL");
1871