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 */
ctcm_unpack_skb(struct channel * ch,struct sk_buff * pskb)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(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 */
channel_free(struct channel * ch)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 */
channel_remove(struct channel * ch)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 */
channel_get(enum ctcm_channel_types type,char * id,int direction)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
ctcm_check_irb_error(struct ccw_device * cdev,struct irb * irb)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 */
ccw_unit_check(struct channel * ch,__u8 sense)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
ctcm_ch_alloc_buffer(struct channel * ch)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 */
ctcm_open(struct net_device * dev)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 */
ctcm_close(struct net_device * dev)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 */
ctcm_transmit_skb(struct channel * ch,struct sk_buff * skb)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
ctcmpc_send_sweep_req(struct channel * rch)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 = skb_put_zero(sweep_skb, TH_SWEEP_LENGTH);
627 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
628 header->sw.th_last_seq = ch->th_seq_num;
629
630 netif_trans_update(dev);
631 skb_queue_tail(&ch->sweep_queue, sweep_skb);
632
633 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
634
635 return;
636
637 nomem:
638 grp->in_sweep = 0;
639 ctcm_clear_busy(dev);
640 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
641
642 return;
643 }
644
645 /*
646 * MPC mode version of transmit_skb
647 */
ctcmpc_transmit_skb(struct channel * ch,struct sk_buff * skb)648 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
649 {
650 struct pdu *p_header;
651 struct net_device *dev = ch->netdev;
652 struct ctcm_priv *priv = dev->ml_priv;
653 struct mpc_group *grp = priv->mpcg;
654 struct th_header *header;
655 struct sk_buff *nskb;
656 int rc = 0;
657 int ccw_idx;
658 unsigned long hi;
659 unsigned long saveflags = 0; /* avoids compiler warning */
660
661 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
662 __func__, dev->name, smp_processor_id(), ch,
663 ch->id, fsm_getstate_str(ch->fsm));
664
665 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
666 spin_lock_irqsave(&ch->collect_lock, saveflags);
667 refcount_inc(&skb->users);
668
669 p_header = skb_push(skb, PDU_HEADER_LENGTH);
670 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
671 p_header->pdu_proto = 0x01;
672 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
673 p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
674 } else {
675 p_header->pdu_flag = PDU_FIRST;
676 }
677 p_header->pdu_seq = 0;
678
679 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
680 "pdu header and data for up to 32 bytes:\n",
681 __func__, dev->name, skb->len);
682 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
683
684 skb_queue_tail(&ch->collect_queue, skb);
685 ch->collect_len += skb->len;
686
687 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
688 goto done;
689 }
690
691 /*
692 * Protect skb against beeing free'd by upper
693 * layers.
694 */
695 refcount_inc(&skb->users);
696
697 /*
698 * IDAL support in CTCM is broken, so we have to
699 * care about skb's above 2G ourselves.
700 */
701 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
702 if (hi) {
703 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
704 if (!nskb) {
705 goto nomem_exit;
706 } else {
707 skb_put_data(nskb, skb->data, skb->len);
708 refcount_inc(&nskb->users);
709 refcount_dec(&skb->users);
710 dev_kfree_skb_irq(skb);
711 skb = nskb;
712 }
713 }
714
715 p_header = skb_push(skb, PDU_HEADER_LENGTH);
716 p_header->pdu_offset = skb->len - PDU_HEADER_LENGTH;
717 p_header->pdu_proto = 0x01;
718 p_header->pdu_seq = 0;
719 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
720 p_header->pdu_flag = PDU_FIRST | PDU_CNTL;
721 } else {
722 p_header->pdu_flag = PDU_FIRST;
723 }
724
725 if (ch->collect_len > 0) {
726 spin_lock_irqsave(&ch->collect_lock, saveflags);
727 skb_queue_tail(&ch->collect_queue, skb);
728 ch->collect_len += skb->len;
729 skb = skb_dequeue(&ch->collect_queue);
730 ch->collect_len -= skb->len;
731 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
732 }
733
734 p_header = (struct pdu *)skb->data;
735 p_header->pdu_flag |= PDU_LAST;
736
737 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
738
739 /* put the TH on the packet */
740 header = skb_push(skb, TH_HEADER_LENGTH);
741 memset(header, 0, TH_HEADER_LENGTH);
742
743 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
744 ch->th_seq_num++;
745 header->th_seq_num = ch->th_seq_num;
746
747 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
748 __func__, dev->name, ch->th_seq_num);
749
750 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
751 "up to 32 bytes sent to vtam:\n",
752 __func__, dev->name, skb->len);
753 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
754
755 ch->ccw[4].count = skb->len;
756 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
757 /*
758 * idal allocation failed, try via copying to trans_skb.
759 * trans_skb usually has a pre-allocated idal.
760 */
761 if (ctcm_checkalloc_buffer(ch)) {
762 /*
763 * Remove our header.
764 * It gets added again on retransmit.
765 */
766 goto nomem_exit;
767 }
768
769 skb_reset_tail_pointer(ch->trans_skb);
770 ch->trans_skb->len = 0;
771 ch->ccw[1].count = skb->len;
772 skb_put_data(ch->trans_skb, skb->data, skb->len);
773 refcount_dec(&skb->users);
774 dev_kfree_skb_irq(skb);
775 ccw_idx = 0;
776 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
777 "up to 32 bytes sent to vtam:\n",
778 __func__, dev->name, ch->trans_skb->len);
779 CTCM_D3_DUMP((char *)ch->trans_skb->data,
780 min_t(int, 32, ch->trans_skb->len));
781 } else {
782 skb_queue_tail(&ch->io_queue, skb);
783 ccw_idx = 3;
784 }
785 ch->retry = 0;
786 fsm_newstate(ch->fsm, CTC_STATE_TX);
787 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
788
789 if (do_debug_ccw)
790 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
791 sizeof(struct ccw1) * 3);
792
793 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
794 ch->prof.send_stamp = jiffies;
795 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
796 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
797 if (ccw_idx == 3)
798 ch->prof.doios_single++;
799 if (rc != 0) {
800 fsm_deltimer(&ch->timer);
801 ctcm_ccw_check_rc(ch, rc, "single skb TX");
802 if (ccw_idx == 3)
803 skb_dequeue_tail(&ch->io_queue);
804 } else if (ccw_idx == 0) {
805 priv->stats.tx_packets++;
806 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
807 }
808 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
809 ctcmpc_send_sweep_req(ch);
810
811 goto done;
812 nomem_exit:
813 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
814 "%s(%s): MEMORY allocation ERROR\n",
815 CTCM_FUNTAIL, ch->id);
816 rc = -ENOMEM;
817 refcount_dec(&skb->users);
818 dev_kfree_skb_any(skb);
819 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
820 done:
821 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
822 return rc;
823 }
824
825 /*
826 * Start transmission of a packet.
827 * Called from generic network device layer.
828 *
829 * skb Pointer to buffer containing the packet.
830 * dev Pointer to interface struct.
831 *
832 * returns 0 if packet consumed, !0 if packet rejected.
833 * Note: If we return !0, then the packet is free'd by
834 * the generic network layer.
835 */
836 /* first merge version - leaving both functions separated */
ctcm_tx(struct sk_buff * skb,struct net_device * dev)837 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
838 {
839 struct ctcm_priv *priv = dev->ml_priv;
840
841 if (skb == NULL) {
842 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
843 "%s(%s): NULL sk_buff passed",
844 CTCM_FUNTAIL, dev->name);
845 priv->stats.tx_dropped++;
846 return NETDEV_TX_OK;
847 }
848 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
849 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
850 "%s(%s): Got sk_buff with head room < %ld bytes",
851 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
852 dev_kfree_skb(skb);
853 priv->stats.tx_dropped++;
854 return NETDEV_TX_OK;
855 }
856
857 /*
858 * If channels are not running, try to restart them
859 * and throw away packet.
860 */
861 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
862 fsm_event(priv->fsm, DEV_EVENT_START, dev);
863 dev_kfree_skb(skb);
864 priv->stats.tx_dropped++;
865 priv->stats.tx_errors++;
866 priv->stats.tx_carrier_errors++;
867 return NETDEV_TX_OK;
868 }
869
870 if (ctcm_test_and_set_busy(dev))
871 return NETDEV_TX_BUSY;
872
873 netif_trans_update(dev);
874 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
875 return NETDEV_TX_BUSY;
876 return NETDEV_TX_OK;
877 }
878
879 /* unmerged MPC variant of ctcm_tx */
ctcmpc_tx(struct sk_buff * skb,struct net_device * dev)880 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
881 {
882 int len = 0;
883 struct ctcm_priv *priv = dev->ml_priv;
884 struct mpc_group *grp = priv->mpcg;
885 struct sk_buff *newskb = NULL;
886
887 /*
888 * Some sanity checks ...
889 */
890 if (skb == NULL) {
891 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
892 "%s(%s): NULL sk_buff passed",
893 CTCM_FUNTAIL, dev->name);
894 priv->stats.tx_dropped++;
895 goto done;
896 }
897 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
898 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
899 "%s(%s): Got sk_buff with head room < %ld bytes",
900 CTCM_FUNTAIL, dev->name,
901 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
902
903 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
904
905 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
906 newskb = __dev_alloc_skb(len, GFP_ATOMIC | GFP_DMA);
907
908 if (!newskb) {
909 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
910 "%s: %s: __dev_alloc_skb failed",
911 __func__, dev->name);
912
913 dev_kfree_skb_any(skb);
914 priv->stats.tx_dropped++;
915 priv->stats.tx_errors++;
916 priv->stats.tx_carrier_errors++;
917 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
918 goto done;
919 }
920 newskb->protocol = skb->protocol;
921 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
922 skb_put_data(newskb, skb->data, skb->len);
923 dev_kfree_skb_any(skb);
924 skb = newskb;
925 }
926
927 /*
928 * If channels are not running,
929 * notify anybody about a link failure and throw
930 * away packet.
931 */
932 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
933 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
934 dev_kfree_skb_any(skb);
935 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
936 "%s(%s): inactive MPCGROUP - dropped",
937 CTCM_FUNTAIL, dev->name);
938 priv->stats.tx_dropped++;
939 priv->stats.tx_errors++;
940 priv->stats.tx_carrier_errors++;
941 goto done;
942 }
943
944 if (ctcm_test_and_set_busy(dev)) {
945 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
946 "%s(%s): device busy - dropped",
947 CTCM_FUNTAIL, dev->name);
948 dev_kfree_skb_any(skb);
949 priv->stats.tx_dropped++;
950 priv->stats.tx_errors++;
951 priv->stats.tx_carrier_errors++;
952 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
953 goto done;
954 }
955
956 netif_trans_update(dev);
957 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
958 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
959 "%s(%s): device error - dropped",
960 CTCM_FUNTAIL, dev->name);
961 dev_kfree_skb_any(skb);
962 priv->stats.tx_dropped++;
963 priv->stats.tx_errors++;
964 priv->stats.tx_carrier_errors++;
965 ctcm_clear_busy(dev);
966 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
967 goto done;
968 }
969 ctcm_clear_busy(dev);
970 done:
971 if (do_debug)
972 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
973
974 return NETDEV_TX_OK; /* handle freeing of skb here */
975 }
976
977
978 /*
979 * Sets MTU of an interface.
980 *
981 * dev Pointer to interface struct.
982 * new_mtu The new MTU to use for this interface.
983 *
984 * returns 0 on success, -EINVAL if MTU is out of valid range.
985 * (valid range is 576 .. 65527). If VM is on the
986 * remote side, maximum MTU is 32760, however this is
987 * not checked here.
988 */
ctcm_change_mtu(struct net_device * dev,int new_mtu)989 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
990 {
991 struct ctcm_priv *priv;
992 int max_bufsize;
993
994 priv = dev->ml_priv;
995 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
996
997 if (IS_MPC(priv)) {
998 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
999 return -EINVAL;
1000 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1001 } else {
1002 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1003 return -EINVAL;
1004 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1005 }
1006 dev->mtu = new_mtu;
1007 return 0;
1008 }
1009
1010 /*
1011 * Returns interface statistics of a device.
1012 *
1013 * dev Pointer to interface struct.
1014 *
1015 * returns Pointer to stats struct of this interface.
1016 */
ctcm_stats(struct net_device * dev)1017 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1018 {
1019 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1020 }
1021
ctcm_free_netdevice(struct net_device * dev)1022 static void ctcm_free_netdevice(struct net_device *dev)
1023 {
1024 struct ctcm_priv *priv;
1025 struct mpc_group *grp;
1026
1027 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1028 "%s(%s)", CTCM_FUNTAIL, dev->name);
1029 priv = dev->ml_priv;
1030 if (priv) {
1031 grp = priv->mpcg;
1032 if (grp) {
1033 if (grp->fsm)
1034 kfree_fsm(grp->fsm);
1035 dev_kfree_skb(grp->xid_skb);
1036 dev_kfree_skb(grp->rcvd_xid_skb);
1037 tasklet_kill(&grp->mpc_tasklet2);
1038 kfree(grp);
1039 priv->mpcg = NULL;
1040 }
1041 if (priv->fsm) {
1042 kfree_fsm(priv->fsm);
1043 priv->fsm = NULL;
1044 }
1045 kfree(priv->xid);
1046 priv->xid = NULL;
1047 /*
1048 * Note: kfree(priv); is done in "opposite" function of
1049 * allocator function probe_device which is remove_device.
1050 */
1051 }
1052 #ifdef MODULE
1053 free_netdev(dev);
1054 #endif
1055 }
1056
1057 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1058
1059 static const struct net_device_ops ctcm_netdev_ops = {
1060 .ndo_open = ctcm_open,
1061 .ndo_stop = ctcm_close,
1062 .ndo_get_stats = ctcm_stats,
1063 .ndo_change_mtu = ctcm_change_mtu,
1064 .ndo_start_xmit = ctcm_tx,
1065 };
1066
1067 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1068 .ndo_open = ctcm_open,
1069 .ndo_stop = ctcm_close,
1070 .ndo_get_stats = ctcm_stats,
1071 .ndo_change_mtu = ctcm_change_mtu,
1072 .ndo_start_xmit = ctcmpc_tx,
1073 };
1074
ctcm_dev_setup(struct net_device * dev)1075 static void ctcm_dev_setup(struct net_device *dev)
1076 {
1077 dev->type = ARPHRD_SLIP;
1078 dev->tx_queue_len = 100;
1079 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1080 dev->min_mtu = 576;
1081 dev->max_mtu = 65527;
1082 }
1083
1084 /*
1085 * Initialize everything of the net device except the name and the
1086 * channel structs.
1087 */
ctcm_init_netdevice(struct ctcm_priv * priv)1088 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1089 {
1090 struct net_device *dev;
1091 struct mpc_group *grp;
1092 if (!priv)
1093 return NULL;
1094
1095 if (IS_MPC(priv))
1096 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1097 ctcm_dev_setup);
1098 else
1099 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1100 ctcm_dev_setup);
1101
1102 if (!dev) {
1103 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1104 "%s: MEMORY allocation ERROR",
1105 CTCM_FUNTAIL);
1106 return NULL;
1107 }
1108 dev->ml_priv = priv;
1109 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1110 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1111 dev_fsm, dev_fsm_len, GFP_KERNEL);
1112 if (priv->fsm == NULL) {
1113 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1114 free_netdev(dev);
1115 return NULL;
1116 }
1117 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1118 fsm_settimer(priv->fsm, &priv->restart_timer);
1119
1120 if (IS_MPC(priv)) {
1121 /* MPC Group Initializations */
1122 grp = ctcmpc_init_mpc_group(priv);
1123 if (grp == NULL) {
1124 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1125 free_netdev(dev);
1126 return NULL;
1127 }
1128 tasklet_init(&grp->mpc_tasklet2,
1129 mpc_group_ready, (unsigned long)dev);
1130 dev->mtu = MPC_BUFSIZE_DEFAULT -
1131 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1132
1133 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1134 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1135 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1136 } else {
1137 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1138 dev->netdev_ops = &ctcm_netdev_ops;
1139 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1140 }
1141
1142 CTCMY_DBF_DEV(SETUP, dev, "finished");
1143
1144 return dev;
1145 }
1146
1147 /*
1148 * Main IRQ handler.
1149 *
1150 * cdev The ccw_device the interrupt is for.
1151 * intparm interruption parameter.
1152 * irb interruption response block.
1153 */
ctcm_irq_handler(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)1154 static void ctcm_irq_handler(struct ccw_device *cdev,
1155 unsigned long intparm, struct irb *irb)
1156 {
1157 struct channel *ch;
1158 struct net_device *dev;
1159 struct ctcm_priv *priv;
1160 struct ccwgroup_device *cgdev;
1161 int cstat;
1162 int dstat;
1163
1164 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1165 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1166
1167 if (ctcm_check_irb_error(cdev, irb))
1168 return;
1169
1170 cgdev = dev_get_drvdata(&cdev->dev);
1171
1172 cstat = irb->scsw.cmd.cstat;
1173 dstat = irb->scsw.cmd.dstat;
1174
1175 /* Check for unsolicited interrupts. */
1176 if (cgdev == NULL) {
1177 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1178 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1179 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1180 dev_warn(&cdev->dev,
1181 "The adapter received a non-specific IRQ\n");
1182 return;
1183 }
1184
1185 priv = dev_get_drvdata(&cgdev->dev);
1186
1187 /* Try to extract channel from driver data. */
1188 if (priv->channel[CTCM_READ]->cdev == cdev)
1189 ch = priv->channel[CTCM_READ];
1190 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1191 ch = priv->channel[CTCM_WRITE];
1192 else {
1193 dev_err(&cdev->dev,
1194 "%s: Internal error: Can't determine channel for "
1195 "interrupt device %s\n",
1196 __func__, dev_name(&cdev->dev));
1197 /* Explain: inconsistent internal structures */
1198 return;
1199 }
1200
1201 dev = ch->netdev;
1202 if (dev == NULL) {
1203 dev_err(&cdev->dev,
1204 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1205 __func__, ch);
1206 /* Explain: inconsistent internal structures */
1207 return;
1208 }
1209
1210 /* Copy interruption response block. */
1211 memcpy(ch->irb, irb, sizeof(struct irb));
1212
1213 /* Issue error message and return on subchannel error code */
1214 if (irb->scsw.cmd.cstat) {
1215 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1216 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1217 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1218 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1219 dev_warn(&cdev->dev,
1220 "A check occurred on the subchannel\n");
1221 return;
1222 }
1223
1224 /* Check the reason-code of a unit check */
1225 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1226 if ((irb->ecw[0] & ch->sense_rc) == 0)
1227 /* print it only once */
1228 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1229 "%s(%s): sense=%02x, ds=%02x",
1230 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1231 ccw_unit_check(ch, irb->ecw[0]);
1232 return;
1233 }
1234 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1235 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1236 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1237 else
1238 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1239 return;
1240 }
1241 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1242 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1243 return;
1244 }
1245 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1246 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1247 (irb->scsw.cmd.stctl ==
1248 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1249 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1250 else
1251 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1252
1253 }
1254
1255 static const struct device_type ctcm_devtype = {
1256 .name = "ctcm",
1257 .groups = ctcm_attr_groups,
1258 };
1259
1260 /*
1261 * Add ctcm specific attributes.
1262 * Add ctcm private data.
1263 *
1264 * cgdev pointer to ccwgroup_device just added
1265 *
1266 * returns 0 on success, !0 on failure.
1267 */
ctcm_probe_device(struct ccwgroup_device * cgdev)1268 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1269 {
1270 struct ctcm_priv *priv;
1271
1272 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1273 "%s %p",
1274 __func__, cgdev);
1275
1276 if (!get_device(&cgdev->dev))
1277 return -ENODEV;
1278
1279 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1280 if (!priv) {
1281 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1282 "%s: memory allocation failure",
1283 CTCM_FUNTAIL);
1284 put_device(&cgdev->dev);
1285 return -ENOMEM;
1286 }
1287 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1288 cgdev->cdev[0]->handler = ctcm_irq_handler;
1289 cgdev->cdev[1]->handler = ctcm_irq_handler;
1290 dev_set_drvdata(&cgdev->dev, priv);
1291 cgdev->dev.type = &ctcm_devtype;
1292
1293 return 0;
1294 }
1295
1296 /*
1297 * Add a new channel to the list of channels.
1298 * Keeps the channel list sorted.
1299 *
1300 * cdev The ccw_device to be added.
1301 * type The type class of the new channel.
1302 * priv Points to the private data of the ccwgroup_device.
1303 *
1304 * returns 0 on success, !0 on error.
1305 */
add_channel(struct ccw_device * cdev,enum ctcm_channel_types type,struct ctcm_priv * priv)1306 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1307 struct ctcm_priv *priv)
1308 {
1309 struct channel **c = &channels;
1310 struct channel *ch;
1311 int ccw_num;
1312 int rc = 0;
1313
1314 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1315 "%s(%s), type %d, proto %d",
1316 __func__, dev_name(&cdev->dev), type, priv->protocol);
1317
1318 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1319 if (ch == NULL)
1320 return -ENOMEM;
1321
1322 ch->protocol = priv->protocol;
1323 if (IS_MPC(priv)) {
1324 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, GFP_KERNEL);
1325 if (ch->discontact_th == NULL)
1326 goto nomem_return;
1327
1328 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1329 tasklet_init(&ch->ch_disc_tasklet,
1330 mpc_action_send_discontact, (unsigned long)ch);
1331
1332 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1333 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1334 ccw_num = 17;
1335 } else
1336 ccw_num = 8;
1337
1338 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1339 if (ch->ccw == NULL)
1340 goto nomem_return;
1341
1342 ch->cdev = cdev;
1343 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1344 ch->type = type;
1345
1346 /*
1347 * "static" ccws are used in the following way:
1348 *
1349 * ccw[0..2] (Channel program for generic I/O):
1350 * 0: prepare
1351 * 1: read or write (depending on direction) with fixed
1352 * buffer (idal allocated once when buffer is allocated)
1353 * 2: nop
1354 * ccw[3..5] (Channel program for direct write of packets)
1355 * 3: prepare
1356 * 4: write (idal allocated on every write).
1357 * 5: nop
1358 * ccw[6..7] (Channel program for initial channel setup):
1359 * 6: set extended mode
1360 * 7: nop
1361 *
1362 * ch->ccw[0..5] are initialized in ch_action_start because
1363 * the channel's direction is yet unknown here.
1364 *
1365 * ccws used for xid2 negotiations
1366 * ch-ccw[8-14] need to be used for the XID exchange either
1367 * X side XID2 Processing
1368 * 8: write control
1369 * 9: write th
1370 * 10: write XID
1371 * 11: read th from secondary
1372 * 12: read XID from secondary
1373 * 13: read 4 byte ID
1374 * 14: nop
1375 * Y side XID Processing
1376 * 8: sense
1377 * 9: read th
1378 * 10: read XID
1379 * 11: write th
1380 * 12: write XID
1381 * 13: write 4 byte ID
1382 * 14: nop
1383 *
1384 * ccws used for double noop due to VM timing issues
1385 * which result in unrecoverable Busy on channel
1386 * 15: nop
1387 * 16: nop
1388 */
1389 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1390 ch->ccw[6].flags = CCW_FLAG_SLI;
1391
1392 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1393 ch->ccw[7].flags = CCW_FLAG_SLI;
1394
1395 if (IS_MPC(priv)) {
1396 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1397 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1398 ch->ccw[15].count = TH_HEADER_LENGTH;
1399 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1400
1401 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1402 ch->ccw[16].flags = CCW_FLAG_SLI;
1403
1404 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1405 ctc_ch_event_names, CTC_MPC_NR_STATES,
1406 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1407 mpc_ch_fsm_len, GFP_KERNEL);
1408 } else {
1409 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1410 ctc_ch_event_names, CTC_NR_STATES,
1411 CTC_NR_EVENTS, ch_fsm,
1412 ch_fsm_len, GFP_KERNEL);
1413 }
1414 if (ch->fsm == NULL)
1415 goto nomem_return;
1416
1417 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1418
1419 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1420 if (ch->irb == NULL)
1421 goto nomem_return;
1422
1423 while (*c && ctcm_less_than((*c)->id, ch->id))
1424 c = &(*c)->next;
1425
1426 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1427 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1428 "%s (%s) already in list, using old entry",
1429 __func__, (*c)->id);
1430
1431 goto free_return;
1432 }
1433
1434 spin_lock_init(&ch->collect_lock);
1435
1436 fsm_settimer(ch->fsm, &ch->timer);
1437 skb_queue_head_init(&ch->io_queue);
1438 skb_queue_head_init(&ch->collect_queue);
1439
1440 if (IS_MPC(priv)) {
1441 fsm_settimer(ch->fsm, &ch->sweep_timer);
1442 skb_queue_head_init(&ch->sweep_queue);
1443 }
1444 ch->next = *c;
1445 *c = ch;
1446 return 0;
1447
1448 nomem_return:
1449 rc = -ENOMEM;
1450
1451 free_return: /* note that all channel pointers are 0 or valid */
1452 kfree(ch->ccw);
1453 kfree(ch->discontact_th);
1454 kfree_fsm(ch->fsm);
1455 kfree(ch->irb);
1456 kfree(ch);
1457 return rc;
1458 }
1459
1460 /*
1461 * Return type of a detected device.
1462 */
get_channel_type(struct ccw_device_id * id)1463 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1464 {
1465 enum ctcm_channel_types type;
1466 type = (enum ctcm_channel_types)id->driver_info;
1467
1468 if (type == ctcm_channel_type_ficon)
1469 type = ctcm_channel_type_escon;
1470
1471 return type;
1472 }
1473
1474 /*
1475 *
1476 * Setup an interface.
1477 *
1478 * cgdev Device to be setup.
1479 *
1480 * returns 0 on success, !0 on failure.
1481 */
ctcm_new_device(struct ccwgroup_device * cgdev)1482 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1483 {
1484 char read_id[CTCM_ID_SIZE];
1485 char write_id[CTCM_ID_SIZE];
1486 int direction;
1487 enum ctcm_channel_types type;
1488 struct ctcm_priv *priv;
1489 struct net_device *dev;
1490 struct ccw_device *cdev0;
1491 struct ccw_device *cdev1;
1492 struct channel *readc;
1493 struct channel *writec;
1494 int ret;
1495 int result;
1496
1497 priv = dev_get_drvdata(&cgdev->dev);
1498 if (!priv) {
1499 result = -ENODEV;
1500 goto out_err_result;
1501 }
1502
1503 cdev0 = cgdev->cdev[0];
1504 cdev1 = cgdev->cdev[1];
1505
1506 type = get_channel_type(&cdev0->id);
1507
1508 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1509 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1510
1511 ret = add_channel(cdev0, type, priv);
1512 if (ret) {
1513 result = ret;
1514 goto out_err_result;
1515 }
1516 ret = add_channel(cdev1, type, priv);
1517 if (ret) {
1518 result = ret;
1519 goto out_remove_channel1;
1520 }
1521
1522 ret = ccw_device_set_online(cdev0);
1523 if (ret != 0) {
1524 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1525 "%s(%s) set_online rc=%d",
1526 CTCM_FUNTAIL, read_id, ret);
1527 result = -EIO;
1528 goto out_remove_channel2;
1529 }
1530
1531 ret = ccw_device_set_online(cdev1);
1532 if (ret != 0) {
1533 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1534 "%s(%s) set_online rc=%d",
1535 CTCM_FUNTAIL, write_id, ret);
1536
1537 result = -EIO;
1538 goto out_ccw1;
1539 }
1540
1541 dev = ctcm_init_netdevice(priv);
1542 if (dev == NULL) {
1543 result = -ENODEV;
1544 goto out_ccw2;
1545 }
1546
1547 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1548 priv->channel[direction] =
1549 channel_get(type, direction == CTCM_READ ?
1550 read_id : write_id, direction);
1551 if (priv->channel[direction] == NULL) {
1552 if (direction == CTCM_WRITE)
1553 channel_free(priv->channel[CTCM_READ]);
1554 result = -ENODEV;
1555 goto out_dev;
1556 }
1557 priv->channel[direction]->netdev = dev;
1558 priv->channel[direction]->protocol = priv->protocol;
1559 priv->channel[direction]->max_bufsize = priv->buffer_size;
1560 }
1561 /* sysfs magic */
1562 SET_NETDEV_DEV(dev, &cgdev->dev);
1563
1564 if (register_netdev(dev)) {
1565 result = -ENODEV;
1566 goto out_dev;
1567 }
1568
1569 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1570
1571 dev_info(&dev->dev,
1572 "setup OK : r/w = %s/%s, protocol : %d\n",
1573 priv->channel[CTCM_READ]->id,
1574 priv->channel[CTCM_WRITE]->id, priv->protocol);
1575
1576 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1577 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1578 priv->channel[CTCM_READ]->id,
1579 priv->channel[CTCM_WRITE]->id, priv->protocol);
1580
1581 return 0;
1582 out_dev:
1583 ctcm_free_netdevice(dev);
1584 out_ccw2:
1585 ccw_device_set_offline(cgdev->cdev[1]);
1586 out_ccw1:
1587 ccw_device_set_offline(cgdev->cdev[0]);
1588 out_remove_channel2:
1589 readc = channel_get(type, read_id, CTCM_READ);
1590 channel_remove(readc);
1591 out_remove_channel1:
1592 writec = channel_get(type, write_id, CTCM_WRITE);
1593 channel_remove(writec);
1594 out_err_result:
1595 return result;
1596 }
1597
1598 /*
1599 * Shutdown an interface.
1600 *
1601 * cgdev Device to be shut down.
1602 *
1603 * returns 0 on success, !0 on failure.
1604 */
ctcm_shutdown_device(struct ccwgroup_device * cgdev)1605 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1606 {
1607 struct ctcm_priv *priv;
1608 struct net_device *dev;
1609
1610 priv = dev_get_drvdata(&cgdev->dev);
1611 if (!priv)
1612 return -ENODEV;
1613
1614 if (priv->channel[CTCM_READ]) {
1615 dev = priv->channel[CTCM_READ]->netdev;
1616 CTCM_DBF_DEV(SETUP, dev, "");
1617 /* Close the device */
1618 ctcm_close(dev);
1619 dev->flags &= ~IFF_RUNNING;
1620 channel_free(priv->channel[CTCM_READ]);
1621 } else
1622 dev = NULL;
1623
1624 if (priv->channel[CTCM_WRITE])
1625 channel_free(priv->channel[CTCM_WRITE]);
1626
1627 if (dev) {
1628 unregister_netdev(dev);
1629 ctcm_free_netdevice(dev);
1630 }
1631
1632 if (priv->fsm)
1633 kfree_fsm(priv->fsm);
1634
1635 ccw_device_set_offline(cgdev->cdev[1]);
1636 ccw_device_set_offline(cgdev->cdev[0]);
1637 channel_remove(priv->channel[CTCM_READ]);
1638 channel_remove(priv->channel[CTCM_WRITE]);
1639 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1640
1641 return 0;
1642
1643 }
1644
1645
ctcm_remove_device(struct ccwgroup_device * cgdev)1646 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1647 {
1648 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1649
1650 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1651 "removing device %p, proto : %d",
1652 cgdev, priv->protocol);
1653
1654 if (cgdev->state == CCWGROUP_ONLINE)
1655 ctcm_shutdown_device(cgdev);
1656 dev_set_drvdata(&cgdev->dev, NULL);
1657 kfree(priv);
1658 put_device(&cgdev->dev);
1659 }
1660
1661 static struct ccw_device_id ctcm_ids[] = {
1662 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1663 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1664 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1665 {},
1666 };
1667 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1668
1669 static struct ccw_driver ctcm_ccw_driver = {
1670 .driver = {
1671 .owner = THIS_MODULE,
1672 .name = "ctcm",
1673 },
1674 .ids = ctcm_ids,
1675 .probe = ccwgroup_probe_ccwdev,
1676 .remove = ccwgroup_remove_ccwdev,
1677 .int_class = IRQIO_CTC,
1678 };
1679
1680 static struct ccwgroup_driver ctcm_group_driver = {
1681 .driver = {
1682 .owner = THIS_MODULE,
1683 .name = CTC_DRIVER_NAME,
1684 },
1685 .ccw_driver = &ctcm_ccw_driver,
1686 .setup = ctcm_probe_device,
1687 .remove = ctcm_remove_device,
1688 .set_online = ctcm_new_device,
1689 .set_offline = ctcm_shutdown_device,
1690 };
1691
group_store(struct device_driver * ddrv,const char * buf,size_t count)1692 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1693 size_t count)
1694 {
1695 int err;
1696
1697 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1698 return err ? err : count;
1699 }
1700 static DRIVER_ATTR_WO(group);
1701
1702 static struct attribute *ctcm_drv_attrs[] = {
1703 &driver_attr_group.attr,
1704 NULL,
1705 };
1706 static struct attribute_group ctcm_drv_attr_group = {
1707 .attrs = ctcm_drv_attrs,
1708 };
1709 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1710 &ctcm_drv_attr_group,
1711 NULL,
1712 };
1713
1714 /*
1715 * Module related routines
1716 */
1717
1718 /*
1719 * Prepare to be unloaded. Free IRQ's and release all resources.
1720 * This is called just before this module is unloaded. It is
1721 * not called, if the usage count is !0, so we don't need to check
1722 * for that.
1723 */
ctcm_exit(void)1724 static void __exit ctcm_exit(void)
1725 {
1726 ccwgroup_driver_unregister(&ctcm_group_driver);
1727 ccw_driver_unregister(&ctcm_ccw_driver);
1728 root_device_unregister(ctcm_root_dev);
1729 ctcm_unregister_dbf_views();
1730 pr_info("CTCM driver unloaded\n");
1731 }
1732
1733 /*
1734 * Print Banner.
1735 */
print_banner(void)1736 static void print_banner(void)
1737 {
1738 pr_info("CTCM driver initialized\n");
1739 }
1740
1741 /*
1742 * Initialize module.
1743 * This is called just after the module is loaded.
1744 *
1745 * returns 0 on success, !0 on error.
1746 */
ctcm_init(void)1747 static int __init ctcm_init(void)
1748 {
1749 int ret;
1750
1751 channels = NULL;
1752
1753 ret = ctcm_register_dbf_views();
1754 if (ret)
1755 goto out_err;
1756 ctcm_root_dev = root_device_register("ctcm");
1757 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1758 if (ret)
1759 goto register_err;
1760 ret = ccw_driver_register(&ctcm_ccw_driver);
1761 if (ret)
1762 goto ccw_err;
1763 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1764 ret = ccwgroup_driver_register(&ctcm_group_driver);
1765 if (ret)
1766 goto ccwgroup_err;
1767 print_banner();
1768 return 0;
1769
1770 ccwgroup_err:
1771 ccw_driver_unregister(&ctcm_ccw_driver);
1772 ccw_err:
1773 root_device_unregister(ctcm_root_dev);
1774 register_err:
1775 ctcm_unregister_dbf_views();
1776 out_err:
1777 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1778 __func__, ret);
1779 return ret;
1780 }
1781
1782 module_init(ctcm_init);
1783 module_exit(ctcm_exit);
1784
1785 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1786 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1787 MODULE_LICENSE("GPL");
1788
1789