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