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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / s390 / net / ctcm_main.c
blob437a6d822105790cbf16ee6ddc609d730c659505
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 */
61 static struct device *ctcm_root_dev;
62
63 /*
64 * Linked list of all detected channels.
65 */
66 struct 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 */
75 void 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 */
188 static 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 */
200 static 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 */
252 static 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
277 static 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 */
309 static 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
382 int 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 */
425 int 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 */
443 int 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 */
465 static 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 }
592 done:
593 ctcm_clear_busy(ch->netdev);
594 return rc;
595 }
596
597 static void ctcmpc_send_sweep_req(struct channel *rch)
598 {
599 struct net_device *dev = rch->netdev;
600 struct ctcm_priv *priv;
601 struct mpc_group *grp;
602 struct th_sweep *header;
603 struct sk_buff *sweep_skb;
604 struct channel *ch;
605 /* int rc = 0; */
606
607 priv = dev->ml_priv;
608 grp = priv->mpcg;
609 ch = priv->channel[CTCM_WRITE];
610
611 /* sweep processing is not complete until response and request */
612 /* has completed for all read channels in group */
613 if (grp->in_sweep == 0) {
614 grp->in_sweep = 1;
615 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617 }
618
619 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621 if (sweep_skb == NULL) {
622 /* rc = -ENOMEM; */
623 goto nomem;
624 }
625
626 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 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
652 nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657 return;
658 }
659
660 /*
661 * MPC mode version of transmit_skb
662 */
663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664 {
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
667 struct ctcm_priv *priv = dev->ml_priv;
668 struct mpc_group *grp = priv->mpcg;
669 struct th_header *header;
670 struct sk_buff *nskb;
671 int rc = 0;
672 int ccw_idx;
673 unsigned long hi;
674 unsigned long saveflags = 0; /* avoids compiler warning */
675
676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 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;
852 nomem_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);
860 done:
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 */
877 static 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 */
920 static 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);
1010 done:
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 */
1029 static 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 */
1057 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1058 {
1059 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1060 }
1061
1062 static void ctcm_free_netdevice(struct net_device *dev)
1063 {
1064 struct ctcm_priv *priv;
1065 struct mpc_group *grp;
1066
1067 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1068 "%s(%s)", CTCM_FUNTAIL, dev->name);
1069 priv = dev->ml_priv;
1070 if (priv) {
1071 grp = priv->mpcg;
1072 if (grp) {
1073 if (grp->fsm)
1074 kfree_fsm(grp->fsm);
1075 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
1097 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1098
1099 static 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
1107 static 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
1115 static 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 */
1128 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1129 {
1130 struct net_device *dev;
1131 struct mpc_group *grp;
1132 if (!priv)
1133 return NULL;
1134
1135 if (IS_MPC(priv))
1136 dev = alloc_netdev(0, MPC_DEVICE_GENE, 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 */
1194 static 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
1295 static 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 */
1308 static 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 */
1346 static 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
1488 nomem_return:
1489 rc = -ENOMEM;
1490
1491 free_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 */
1503 static 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 */
1522 static 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;
1622 out_dev:
1623 ctcm_free_netdevice(dev);
1624 out_ccw2:
1625 ccw_device_set_offline(cgdev->cdev[1]);
1626 out_ccw1:
1627 ccw_device_set_offline(cgdev->cdev[0]);
1628 out_remove_channel2:
1629 readc = channel_get(type, read_id, CTCM_READ);
1630 channel_remove(readc);
1631 out_remove_channel1:
1632 writec = channel_get(type, write_id, CTCM_WRITE);
1633 channel_remove(writec);
1634 out_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 */
1645 static 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
1686 static 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
1701 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1702 {
1703 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1704
1705 if (gdev->state == CCWGROUP_OFFLINE)
1706 return 0;
1707 netif_device_detach(priv->channel[CTCM_READ]->netdev);
1708 ctcm_close(priv->channel[CTCM_READ]->netdev);
1709 if (!wait_event_timeout(priv->fsm->wait_q,
1710 fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1711 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1712 return -EBUSY;
1713 }
1714 ccw_device_set_offline(gdev->cdev[1]);
1715 ccw_device_set_offline(gdev->cdev[0]);
1716 return 0;
1717 }
1718
1719 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1720 {
1721 struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1722 int rc;
1723
1724 if (gdev->state == CCWGROUP_OFFLINE)
1725 return 0;
1726 rc = ccw_device_set_online(gdev->cdev[1]);
1727 if (rc)
1728 goto err_out;
1729 rc = ccw_device_set_online(gdev->cdev[0]);
1730 if (rc)
1731 goto err_out;
1732 ctcm_open(priv->channel[CTCM_READ]->netdev);
1733 err_out:
1734 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1735 return rc;
1736 }
1737
1738 static struct ccw_device_id ctcm_ids[] = {
1739 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1740 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1741 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1742 {},
1743 };
1744 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1745
1746 static struct ccw_driver ctcm_ccw_driver = {
1747 .driver = {
1748 .owner = THIS_MODULE,
1749 .name = "ctcm",
1750 },
1751 .ids = ctcm_ids,
1752 .probe = ccwgroup_probe_ccwdev,
1753 .remove = ccwgroup_remove_ccwdev,
1754 .int_class = IRQIO_CTC,
1755 };
1756
1757 static struct ccwgroup_driver ctcm_group_driver = {
1758 .driver = {
1759 .owner = THIS_MODULE,
1760 .name = CTC_DRIVER_NAME,
1761 },
1762 .ccw_driver = &ctcm_ccw_driver,
1763 .setup = ctcm_probe_device,
1764 .remove = ctcm_remove_device,
1765 .set_online = ctcm_new_device,
1766 .set_offline = ctcm_shutdown_device,
1767 .freeze = ctcm_pm_suspend,
1768 .thaw = ctcm_pm_resume,
1769 .restore = ctcm_pm_resume,
1770 };
1771
1772 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1773 size_t count)
1774 {
1775 int err;
1776
1777 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1778 return err ? err : count;
1779 }
1780 static DRIVER_ATTR_WO(group);
1781
1782 static struct attribute *ctcm_drv_attrs[] = {
1783 &driver_attr_group.attr,
1784 NULL,
1785 };
1786 static struct attribute_group ctcm_drv_attr_group = {
1787 .attrs = ctcm_drv_attrs,
1788 };
1789 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1790 &ctcm_drv_attr_group,
1791 NULL,
1792 };
1793
1794 /*
1795 * Module related routines
1796 */
1797
1798 /*
1799 * Prepare to be unloaded. Free IRQ's and release all resources.
1800 * This is called just before this module is unloaded. It is
1801 * not called, if the usage count is !0, so we don't need to check
1802 * for that.
1803 */
1804 static void __exit ctcm_exit(void)
1805 {
1806 ccwgroup_driver_unregister(&ctcm_group_driver);
1807 ccw_driver_unregister(&ctcm_ccw_driver);
1808 root_device_unregister(ctcm_root_dev);
1809 ctcm_unregister_dbf_views();
1810 pr_info("CTCM driver unloaded\n");
1811 }
1812
1813 /*
1814 * Print Banner.
1815 */
1816 static void print_banner(void)
1817 {
1818 pr_info("CTCM driver initialized\n");
1819 }
1820
1821 /**
1822 * Initialize module.
1823 * This is called just after the module is loaded.
1824 *
1825 * returns 0 on success, !0 on error.
1826 */
1827 static int __init ctcm_init(void)
1828 {
1829 int ret;
1830
1831 channels = NULL;
1832
1833 ret = ctcm_register_dbf_views();
1834 if (ret)
1835 goto out_err;
1836 ctcm_root_dev = root_device_register("ctcm");
1837 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1838 if (ret)
1839 goto register_err;
1840 ret = ccw_driver_register(&ctcm_ccw_driver);
1841 if (ret)
1842 goto ccw_err;
1843 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1844 ret = ccwgroup_driver_register(&ctcm_group_driver);
1845 if (ret)
1846 goto ccwgroup_err;
1847 print_banner();
1848 return 0;
1849
1850 ccwgroup_err:
1851 ccw_driver_unregister(&ctcm_ccw_driver);
1852 ccw_err:
1853 root_device_unregister(ctcm_root_dev);
1854 register_err:
1855 ctcm_unregister_dbf_views();
1856 out_err:
1857 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1858 __func__, ret);
1859 return ret;
1860 }
1861
1862 module_init(ctcm_init);
1863 module_exit(ctcm_exit);
1864
1865 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1866 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1867 MODULE_LICENSE("GPL");
1868
Linux with added FPC-III support