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_ni(skb);
170 if (len > 0) {
171 skb_pull(pskb, header->length);
172 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
173 CTCM_DBF_DEV_NAME(TRACE, dev,
174 "Overrun in ctcm_unpack_skb");
175 ch->logflags |= LOG_FLAG_OVERRUN;
176 return;
177 }
178 skb_put(pskb, LL_HEADER_LENGTH);
179 }
180 }
181 }
182
183 /**
184 * Release a specific channel in the channel list.
185 *
186 * ch Pointer to channel struct to be released.
187 */
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 = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628 if (!header) {
629 dev_kfree_skb_any(sweep_skb);
630 /* rc = -ENOMEM; */
631 goto nomem;
632 }
633
634 header->th.th_seg = 0x00 ;
635 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
636 header->th.th_blk_flag = 0x00;
637 header->th.th_is_xid = 0x00;
638 header->th.th_seq_num = 0x00;
639 header->sw.th_last_seq = ch->th_seq_num;
640
641 skb_put_data(sweep_skb, header, TH_SWEEP_LENGTH);
642
643 kfree(header);
644
645 netif_trans_update(dev);
646 skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650 return;
651
652 nomem:
653 grp->in_sweep = 0;
654 ctcm_clear_busy(dev);
655 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657 return;
658 }
659
660 /*
661 * MPC mode version of transmit_skb
662 */
ctcmpc_transmit_skb(struct channel * ch,struct sk_buff * skb)663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664 {
665 struct pdu *p_header;
666 struct net_device *dev = ch->netdev;
667 struct ctcm_priv *priv = dev->ml_priv;
668 struct mpc_group *grp = priv->mpcg;
669 struct th_header *header;
670 struct sk_buff *nskb;
671 int rc = 0;
672 int ccw_idx;
673 unsigned long hi;
674 unsigned long saveflags = 0; /* avoids compiler warning */
675
676 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677 __func__, dev->name, smp_processor_id(), ch,
678 ch->id, fsm_getstate_str(ch->fsm));
679
680 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681 spin_lock_irqsave(&ch->collect_lock, saveflags);
682 refcount_inc(&skb->users);
683 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
684
685 if (!p_header) {
686 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
687 goto nomem_exit;
688 }
689
690 p_header->pdu_offset = skb->len;
691 p_header->pdu_proto = 0x01;
692 p_header->pdu_flag = 0x00;
693 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
694 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
695 } else {
696 p_header->pdu_flag |= PDU_FIRST;
697 }
698 p_header->pdu_seq = 0;
699 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
700 PDU_HEADER_LENGTH);
701
702 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
703 "pdu header and data for up to 32 bytes:\n",
704 __func__, dev->name, skb->len);
705 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
706
707 skb_queue_tail(&ch->collect_queue, skb);
708 ch->collect_len += skb->len;
709 kfree(p_header);
710
711 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
712 goto done;
713 }
714
715 /*
716 * Protect skb against beeing free'd by upper
717 * layers.
718 */
719 refcount_inc(&skb->users);
720
721 /*
722 * IDAL support in CTCM is broken, so we have to
723 * care about skb's above 2G ourselves.
724 */
725 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726 if (hi) {
727 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728 if (!nskb) {
729 goto nomem_exit;
730 } else {
731 skb_put_data(nskb, skb->data, skb->len);
732 refcount_inc(&nskb->users);
733 refcount_dec(&skb->users);
734 dev_kfree_skb_irq(skb);
735 skb = nskb;
736 }
737 }
738
739 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741 if (!p_header)
742 goto nomem_exit;
743
744 p_header->pdu_offset = skb->len;
745 p_header->pdu_proto = 0x01;
746 p_header->pdu_flag = 0x00;
747 p_header->pdu_seq = 0;
748 if (be16_to_cpu(skb->protocol) == ETH_P_SNAP) {
749 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750 } else {
751 p_header->pdu_flag |= PDU_FIRST;
752 }
753 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755 kfree(p_header);
756
757 if (ch->collect_len > 0) {
758 spin_lock_irqsave(&ch->collect_lock, saveflags);
759 skb_queue_tail(&ch->collect_queue, skb);
760 ch->collect_len += skb->len;
761 skb = skb_dequeue(&ch->collect_queue);
762 ch->collect_len -= skb->len;
763 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764 }
765
766 p_header = (struct pdu *)skb->data;
767 p_header->pdu_flag |= PDU_LAST;
768
769 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772 if (!header)
773 goto nomem_exit;
774
775 header->th_seg = 0x00;
776 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
777 header->th_blk_flag = 0x00;
778 header->th_is_xid = 0x00; /* Just data here */
779 ch->th_seq_num++;
780 header->th_seq_num = ch->th_seq_num;
781
782 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783 __func__, dev->name, ch->th_seq_num);
784
785 /* put the TH on the packet */
786 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788 kfree(header);
789
790 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791 "up to 32 bytes sent to vtam:\n",
792 __func__, dev->name, skb->len);
793 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795 ch->ccw[4].count = skb->len;
796 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797 /*
798 * idal allocation failed, try via copying to trans_skb.
799 * trans_skb usually has a pre-allocated idal.
800 */
801 if (ctcm_checkalloc_buffer(ch)) {
802 /*
803 * Remove our header.
804 * It gets added again on retransmit.
805 */
806 goto nomem_exit;
807 }
808
809 skb_reset_tail_pointer(ch->trans_skb);
810 ch->trans_skb->len = 0;
811 ch->ccw[1].count = skb->len;
812 skb_put_data(ch->trans_skb, skb->data, skb->len);
813 refcount_dec(&skb->users);
814 dev_kfree_skb_irq(skb);
815 ccw_idx = 0;
816 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817 "up to 32 bytes sent to vtam:\n",
818 __func__, dev->name, ch->trans_skb->len);
819 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820 min_t(int, 32, ch->trans_skb->len));
821 } else {
822 skb_queue_tail(&ch->io_queue, skb);
823 ccw_idx = 3;
824 }
825 ch->retry = 0;
826 fsm_newstate(ch->fsm, CTC_STATE_TX);
827 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829 if (do_debug_ccw)
830 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831 sizeof(struct ccw1) * 3);
832
833 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834 ch->prof.send_stamp = jiffies;
835 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], 0, 0xff, 0);
836 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
837 if (ccw_idx == 3)
838 ch->prof.doios_single++;
839 if (rc != 0) {
840 fsm_deltimer(&ch->timer);
841 ctcm_ccw_check_rc(ch, rc, "single skb TX");
842 if (ccw_idx == 3)
843 skb_dequeue_tail(&ch->io_queue);
844 } else if (ccw_idx == 0) {
845 priv->stats.tx_packets++;
846 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
847 }
848 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
849 ctcmpc_send_sweep_req(ch);
850
851 goto done;
852 nomem_exit:
853 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
854 "%s(%s): MEMORY allocation ERROR\n",
855 CTCM_FUNTAIL, ch->id);
856 rc = -ENOMEM;
857 refcount_dec(&skb->users);
858 dev_kfree_skb_any(skb);
859 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
860 done:
861 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
862 return rc;
863 }
864
865 /**
866 * Start transmission of a packet.
867 * Called from generic network device layer.
868 */
869 /* first merge version - leaving both functions separated */
ctcm_tx(struct sk_buff * skb,struct net_device * dev)870 static netdev_tx_t ctcm_tx(struct sk_buff *skb, struct net_device *dev)
871 {
872 struct ctcm_priv *priv = dev->ml_priv;
873
874 if (skb == NULL) {
875 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
876 "%s(%s): NULL sk_buff passed",
877 CTCM_FUNTAIL, dev->name);
878 priv->stats.tx_dropped++;
879 return NETDEV_TX_OK;
880 }
881 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
882 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
883 "%s(%s): Got sk_buff with head room < %ld bytes",
884 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
885 dev_kfree_skb(skb);
886 priv->stats.tx_dropped++;
887 return NETDEV_TX_OK;
888 }
889
890 /*
891 * If channels are not running, try to restart them
892 * and throw away packet.
893 */
894 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
895 fsm_event(priv->fsm, DEV_EVENT_START, dev);
896 dev_kfree_skb(skb);
897 priv->stats.tx_dropped++;
898 priv->stats.tx_errors++;
899 priv->stats.tx_carrier_errors++;
900 return NETDEV_TX_OK;
901 }
902
903 if (ctcm_test_and_set_busy(dev))
904 return NETDEV_TX_BUSY;
905
906 netif_trans_update(dev);
907 if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
908 return NETDEV_TX_BUSY;
909 return NETDEV_TX_OK;
910 }
911
912 /* unmerged MPC variant of ctcm_tx */
ctcmpc_tx(struct sk_buff * skb,struct net_device * dev)913 static netdev_tx_t ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
914 {
915 int len = 0;
916 struct ctcm_priv *priv = dev->ml_priv;
917 struct mpc_group *grp = priv->mpcg;
918 struct sk_buff *newskb = NULL;
919
920 /*
921 * Some sanity checks ...
922 */
923 if (skb == NULL) {
924 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
925 "%s(%s): NULL sk_buff passed",
926 CTCM_FUNTAIL, dev->name);
927 priv->stats.tx_dropped++;
928 goto done;
929 }
930 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
931 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
932 "%s(%s): Got sk_buff with head room < %ld bytes",
933 CTCM_FUNTAIL, dev->name,
934 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
935
936 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
937
938 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
939 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
940
941 if (!newskb) {
942 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
943 "%s: %s: __dev_alloc_skb failed",
944 __func__, dev->name);
945
946 dev_kfree_skb_any(skb);
947 priv->stats.tx_dropped++;
948 priv->stats.tx_errors++;
949 priv->stats.tx_carrier_errors++;
950 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
951 goto done;
952 }
953 newskb->protocol = skb->protocol;
954 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
955 skb_put_data(newskb, skb->data, skb->len);
956 dev_kfree_skb_any(skb);
957 skb = newskb;
958 }
959
960 /*
961 * If channels are not running,
962 * notify anybody about a link failure and throw
963 * away packet.
964 */
965 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
966 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
967 dev_kfree_skb_any(skb);
968 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
969 "%s(%s): inactive MPCGROUP - dropped",
970 CTCM_FUNTAIL, dev->name);
971 priv->stats.tx_dropped++;
972 priv->stats.tx_errors++;
973 priv->stats.tx_carrier_errors++;
974 goto done;
975 }
976
977 if (ctcm_test_and_set_busy(dev)) {
978 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
979 "%s(%s): device busy - dropped",
980 CTCM_FUNTAIL, dev->name);
981 dev_kfree_skb_any(skb);
982 priv->stats.tx_dropped++;
983 priv->stats.tx_errors++;
984 priv->stats.tx_carrier_errors++;
985 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
986 goto done;
987 }
988
989 netif_trans_update(dev);
990 if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
991 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
992 "%s(%s): device error - dropped",
993 CTCM_FUNTAIL, dev->name);
994 dev_kfree_skb_any(skb);
995 priv->stats.tx_dropped++;
996 priv->stats.tx_errors++;
997 priv->stats.tx_carrier_errors++;
998 ctcm_clear_busy(dev);
999 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1000 goto done;
1001 }
1002 ctcm_clear_busy(dev);
1003 done:
1004 if (do_debug)
1005 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1006
1007 return NETDEV_TX_OK; /* handle freeing of skb here */
1008 }
1009
1010
1011 /**
1012 * Sets MTU of an interface.
1013 *
1014 * dev Pointer to interface struct.
1015 * new_mtu The new MTU to use for this interface.
1016 *
1017 * returns 0 on success, -EINVAL if MTU is out of valid range.
1018 * (valid range is 576 .. 65527). If VM is on the
1019 * remote side, maximum MTU is 32760, however this is
1020 * not checked here.
1021 */
ctcm_change_mtu(struct net_device * dev,int new_mtu)1022 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1023 {
1024 struct ctcm_priv *priv;
1025 int max_bufsize;
1026
1027 priv = dev->ml_priv;
1028 max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1029
1030 if (IS_MPC(priv)) {
1031 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1032 return -EINVAL;
1033 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1034 } else {
1035 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1036 return -EINVAL;
1037 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1038 }
1039 dev->mtu = new_mtu;
1040 return 0;
1041 }
1042
1043 /**
1044 * Returns interface statistics of a device.
1045 *
1046 * dev Pointer to interface struct.
1047 *
1048 * returns Pointer to stats struct of this interface.
1049 */
ctcm_stats(struct net_device * dev)1050 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1051 {
1052 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1053 }
1054
ctcm_free_netdevice(struct net_device * dev)1055 static void ctcm_free_netdevice(struct net_device *dev)
1056 {
1057 struct ctcm_priv *priv;
1058 struct mpc_group *grp;
1059
1060 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1061 "%s(%s)", CTCM_FUNTAIL, dev->name);
1062 priv = dev->ml_priv;
1063 if (priv) {
1064 grp = priv->mpcg;
1065 if (grp) {
1066 if (grp->fsm)
1067 kfree_fsm(grp->fsm);
1068 dev_kfree_skb(grp->xid_skb);
1069 dev_kfree_skb(grp->rcvd_xid_skb);
1070 tasklet_kill(&grp->mpc_tasklet2);
1071 kfree(grp);
1072 priv->mpcg = NULL;
1073 }
1074 if (priv->fsm) {
1075 kfree_fsm(priv->fsm);
1076 priv->fsm = NULL;
1077 }
1078 kfree(priv->xid);
1079 priv->xid = NULL;
1080 /*
1081 * Note: kfree(priv); is done in "opposite" function of
1082 * allocator function probe_device which is remove_device.
1083 */
1084 }
1085 #ifdef MODULE
1086 free_netdev(dev);
1087 #endif
1088 }
1089
1090 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1091
1092 static const struct net_device_ops ctcm_netdev_ops = {
1093 .ndo_open = ctcm_open,
1094 .ndo_stop = ctcm_close,
1095 .ndo_get_stats = ctcm_stats,
1096 .ndo_change_mtu = ctcm_change_mtu,
1097 .ndo_start_xmit = ctcm_tx,
1098 };
1099
1100 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1101 .ndo_open = ctcm_open,
1102 .ndo_stop = ctcm_close,
1103 .ndo_get_stats = ctcm_stats,
1104 .ndo_change_mtu = ctcm_change_mtu,
1105 .ndo_start_xmit = ctcmpc_tx,
1106 };
1107
ctcm_dev_setup(struct net_device * dev)1108 static void ctcm_dev_setup(struct net_device *dev)
1109 {
1110 dev->type = ARPHRD_SLIP;
1111 dev->tx_queue_len = 100;
1112 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1113 dev->min_mtu = 576;
1114 dev->max_mtu = 65527;
1115 }
1116
1117 /*
1118 * Initialize everything of the net device except the name and the
1119 * channel structs.
1120 */
ctcm_init_netdevice(struct ctcm_priv * priv)1121 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1122 {
1123 struct net_device *dev;
1124 struct mpc_group *grp;
1125 if (!priv)
1126 return NULL;
1127
1128 if (IS_MPC(priv))
1129 dev = alloc_netdev(0, MPC_DEVICE_GENE, NET_NAME_UNKNOWN,
1130 ctcm_dev_setup);
1131 else
1132 dev = alloc_netdev(0, CTC_DEVICE_GENE, NET_NAME_UNKNOWN,
1133 ctcm_dev_setup);
1134
1135 if (!dev) {
1136 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1137 "%s: MEMORY allocation ERROR",
1138 CTCM_FUNTAIL);
1139 return NULL;
1140 }
1141 dev->ml_priv = priv;
1142 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1143 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1144 dev_fsm, dev_fsm_len, GFP_KERNEL);
1145 if (priv->fsm == NULL) {
1146 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1147 free_netdev(dev);
1148 return NULL;
1149 }
1150 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1151 fsm_settimer(priv->fsm, &priv->restart_timer);
1152
1153 if (IS_MPC(priv)) {
1154 /* MPC Group Initializations */
1155 grp = ctcmpc_init_mpc_group(priv);
1156 if (grp == NULL) {
1157 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1158 free_netdev(dev);
1159 return NULL;
1160 }
1161 tasklet_init(&grp->mpc_tasklet2,
1162 mpc_group_ready, (unsigned long)dev);
1163 dev->mtu = MPC_BUFSIZE_DEFAULT -
1164 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1165
1166 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1167 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1168 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1169 } else {
1170 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1171 dev->netdev_ops = &ctcm_netdev_ops;
1172 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1173 }
1174
1175 CTCMY_DBF_DEV(SETUP, dev, "finished");
1176
1177 return dev;
1178 }
1179
1180 /**
1181 * Main IRQ handler.
1182 *
1183 * cdev The ccw_device the interrupt is for.
1184 * intparm interruption parameter.
1185 * irb interruption response block.
1186 */
ctcm_irq_handler(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)1187 static void ctcm_irq_handler(struct ccw_device *cdev,
1188 unsigned long intparm, struct irb *irb)
1189 {
1190 struct channel *ch;
1191 struct net_device *dev;
1192 struct ctcm_priv *priv;
1193 struct ccwgroup_device *cgdev;
1194 int cstat;
1195 int dstat;
1196
1197 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1198 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1199
1200 if (ctcm_check_irb_error(cdev, irb))
1201 return;
1202
1203 cgdev = dev_get_drvdata(&cdev->dev);
1204
1205 cstat = irb->scsw.cmd.cstat;
1206 dstat = irb->scsw.cmd.dstat;
1207
1208 /* Check for unsolicited interrupts. */
1209 if (cgdev == NULL) {
1210 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1211 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1212 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1213 dev_warn(&cdev->dev,
1214 "The adapter received a non-specific IRQ\n");
1215 return;
1216 }
1217
1218 priv = dev_get_drvdata(&cgdev->dev);
1219
1220 /* Try to extract channel from driver data. */
1221 if (priv->channel[CTCM_READ]->cdev == cdev)
1222 ch = priv->channel[CTCM_READ];
1223 else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1224 ch = priv->channel[CTCM_WRITE];
1225 else {
1226 dev_err(&cdev->dev,
1227 "%s: Internal error: Can't determine channel for "
1228 "interrupt device %s\n",
1229 __func__, dev_name(&cdev->dev));
1230 /* Explain: inconsistent internal structures */
1231 return;
1232 }
1233
1234 dev = ch->netdev;
1235 if (dev == NULL) {
1236 dev_err(&cdev->dev,
1237 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1238 __func__, ch);
1239 /* Explain: inconsistent internal structures */
1240 return;
1241 }
1242
1243 /* Copy interruption response block. */
1244 memcpy(ch->irb, irb, sizeof(struct irb));
1245
1246 /* Issue error message and return on subchannel error code */
1247 if (irb->scsw.cmd.cstat) {
1248 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1249 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1250 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1251 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1252 dev_warn(&cdev->dev,
1253 "A check occurred on the subchannel\n");
1254 return;
1255 }
1256
1257 /* Check the reason-code of a unit check */
1258 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1259 if ((irb->ecw[0] & ch->sense_rc) == 0)
1260 /* print it only once */
1261 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1262 "%s(%s): sense=%02x, ds=%02x",
1263 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1264 ccw_unit_check(ch, irb->ecw[0]);
1265 return;
1266 }
1267 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1268 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1269 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1270 else
1271 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1272 return;
1273 }
1274 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1275 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1276 return;
1277 }
1278 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1279 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1280 (irb->scsw.cmd.stctl ==
1281 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1282 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1283 else
1284 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1285
1286 }
1287
1288 static const struct device_type ctcm_devtype = {
1289 .name = "ctcm",
1290 .groups = ctcm_attr_groups,
1291 };
1292
1293 /**
1294 * Add ctcm specific attributes.
1295 * Add ctcm private data.
1296 *
1297 * cgdev pointer to ccwgroup_device just added
1298 *
1299 * returns 0 on success, !0 on failure.
1300 */
ctcm_probe_device(struct ccwgroup_device * cgdev)1301 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1302 {
1303 struct ctcm_priv *priv;
1304
1305 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1306 "%s %p",
1307 __func__, cgdev);
1308
1309 if (!get_device(&cgdev->dev))
1310 return -ENODEV;
1311
1312 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1313 if (!priv) {
1314 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1315 "%s: memory allocation failure",
1316 CTCM_FUNTAIL);
1317 put_device(&cgdev->dev);
1318 return -ENOMEM;
1319 }
1320 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1321 cgdev->cdev[0]->handler = ctcm_irq_handler;
1322 cgdev->cdev[1]->handler = ctcm_irq_handler;
1323 dev_set_drvdata(&cgdev->dev, priv);
1324 cgdev->dev.type = &ctcm_devtype;
1325
1326 return 0;
1327 }
1328
1329 /**
1330 * Add a new channel to the list of channels.
1331 * Keeps the channel list sorted.
1332 *
1333 * cdev The ccw_device to be added.
1334 * type The type class of the new channel.
1335 * priv Points to the private data of the ccwgroup_device.
1336 *
1337 * returns 0 on success, !0 on error.
1338 */
add_channel(struct ccw_device * cdev,enum ctcm_channel_types type,struct ctcm_priv * priv)1339 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1340 struct ctcm_priv *priv)
1341 {
1342 struct channel **c = &channels;
1343 struct channel *ch;
1344 int ccw_num;
1345 int rc = 0;
1346
1347 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1348 "%s(%s), type %d, proto %d",
1349 __func__, dev_name(&cdev->dev), type, priv->protocol);
1350
1351 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1352 if (ch == NULL)
1353 return -ENOMEM;
1354
1355 ch->protocol = priv->protocol;
1356 if (IS_MPC(priv)) {
1357 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1358 if (ch->discontact_th == NULL)
1359 goto nomem_return;
1360
1361 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1362 tasklet_init(&ch->ch_disc_tasklet,
1363 mpc_action_send_discontact, (unsigned long)ch);
1364
1365 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1366 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1367 ccw_num = 17;
1368 } else
1369 ccw_num = 8;
1370
1371 ch->ccw = kcalloc(ccw_num, sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1372 if (ch->ccw == NULL)
1373 goto nomem_return;
1374
1375 ch->cdev = cdev;
1376 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1377 ch->type = type;
1378
1379 /**
1380 * "static" ccws are used in the following way:
1381 *
1382 * ccw[0..2] (Channel program for generic I/O):
1383 * 0: prepare
1384 * 1: read or write (depending on direction) with fixed
1385 * buffer (idal allocated once when buffer is allocated)
1386 * 2: nop
1387 * ccw[3..5] (Channel program for direct write of packets)
1388 * 3: prepare
1389 * 4: write (idal allocated on every write).
1390 * 5: nop
1391 * ccw[6..7] (Channel program for initial channel setup):
1392 * 6: set extended mode
1393 * 7: nop
1394 *
1395 * ch->ccw[0..5] are initialized in ch_action_start because
1396 * the channel's direction is yet unknown here.
1397 *
1398 * ccws used for xid2 negotiations
1399 * ch-ccw[8-14] need to be used for the XID exchange either
1400 * X side XID2 Processing
1401 * 8: write control
1402 * 9: write th
1403 * 10: write XID
1404 * 11: read th from secondary
1405 * 12: read XID from secondary
1406 * 13: read 4 byte ID
1407 * 14: nop
1408 * Y side XID Processing
1409 * 8: sense
1410 * 9: read th
1411 * 10: read XID
1412 * 11: write th
1413 * 12: write XID
1414 * 13: write 4 byte ID
1415 * 14: nop
1416 *
1417 * ccws used for double noop due to VM timing issues
1418 * which result in unrecoverable Busy on channel
1419 * 15: nop
1420 * 16: nop
1421 */
1422 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1423 ch->ccw[6].flags = CCW_FLAG_SLI;
1424
1425 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1426 ch->ccw[7].flags = CCW_FLAG_SLI;
1427
1428 if (IS_MPC(priv)) {
1429 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1430 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1431 ch->ccw[15].count = TH_HEADER_LENGTH;
1432 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1433
1434 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1435 ch->ccw[16].flags = CCW_FLAG_SLI;
1436
1437 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1438 ctc_ch_event_names, CTC_MPC_NR_STATES,
1439 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1440 mpc_ch_fsm_len, GFP_KERNEL);
1441 } else {
1442 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1443 ctc_ch_event_names, CTC_NR_STATES,
1444 CTC_NR_EVENTS, ch_fsm,
1445 ch_fsm_len, GFP_KERNEL);
1446 }
1447 if (ch->fsm == NULL)
1448 goto nomem_return;
1449
1450 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1451
1452 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1453 if (ch->irb == NULL)
1454 goto nomem_return;
1455
1456 while (*c && ctcm_less_than((*c)->id, ch->id))
1457 c = &(*c)->next;
1458
1459 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1460 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1461 "%s (%s) already in list, using old entry",
1462 __func__, (*c)->id);
1463
1464 goto free_return;
1465 }
1466
1467 spin_lock_init(&ch->collect_lock);
1468
1469 fsm_settimer(ch->fsm, &ch->timer);
1470 skb_queue_head_init(&ch->io_queue);
1471 skb_queue_head_init(&ch->collect_queue);
1472
1473 if (IS_MPC(priv)) {
1474 fsm_settimer(ch->fsm, &ch->sweep_timer);
1475 skb_queue_head_init(&ch->sweep_queue);
1476 }
1477 ch->next = *c;
1478 *c = ch;
1479 return 0;
1480
1481 nomem_return:
1482 rc = -ENOMEM;
1483
1484 free_return: /* note that all channel pointers are 0 or valid */
1485 kfree(ch->ccw);
1486 kfree(ch->discontact_th);
1487 kfree_fsm(ch->fsm);
1488 kfree(ch->irb);
1489 kfree(ch);
1490 return rc;
1491 }
1492
1493 /*
1494 * Return type of a detected device.
1495 */
get_channel_type(struct ccw_device_id * id)1496 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1497 {
1498 enum ctcm_channel_types type;
1499 type = (enum ctcm_channel_types)id->driver_info;
1500
1501 if (type == ctcm_channel_type_ficon)
1502 type = ctcm_channel_type_escon;
1503
1504 return type;
1505 }
1506
1507 /**
1508 *
1509 * Setup an interface.
1510 *
1511 * cgdev Device to be setup.
1512 *
1513 * returns 0 on success, !0 on failure.
1514 */
ctcm_new_device(struct ccwgroup_device * cgdev)1515 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1516 {
1517 char read_id[CTCM_ID_SIZE];
1518 char write_id[CTCM_ID_SIZE];
1519 int direction;
1520 enum ctcm_channel_types type;
1521 struct ctcm_priv *priv;
1522 struct net_device *dev;
1523 struct ccw_device *cdev0;
1524 struct ccw_device *cdev1;
1525 struct channel *readc;
1526 struct channel *writec;
1527 int ret;
1528 int result;
1529
1530 priv = dev_get_drvdata(&cgdev->dev);
1531 if (!priv) {
1532 result = -ENODEV;
1533 goto out_err_result;
1534 }
1535
1536 cdev0 = cgdev->cdev[0];
1537 cdev1 = cgdev->cdev[1];
1538
1539 type = get_channel_type(&cdev0->id);
1540
1541 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1542 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1543
1544 ret = add_channel(cdev0, type, priv);
1545 if (ret) {
1546 result = ret;
1547 goto out_err_result;
1548 }
1549 ret = add_channel(cdev1, type, priv);
1550 if (ret) {
1551 result = ret;
1552 goto out_remove_channel1;
1553 }
1554
1555 ret = ccw_device_set_online(cdev0);
1556 if (ret != 0) {
1557 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1558 "%s(%s) set_online rc=%d",
1559 CTCM_FUNTAIL, read_id, ret);
1560 result = -EIO;
1561 goto out_remove_channel2;
1562 }
1563
1564 ret = ccw_device_set_online(cdev1);
1565 if (ret != 0) {
1566 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1567 "%s(%s) set_online rc=%d",
1568 CTCM_FUNTAIL, write_id, ret);
1569
1570 result = -EIO;
1571 goto out_ccw1;
1572 }
1573
1574 dev = ctcm_init_netdevice(priv);
1575 if (dev == NULL) {
1576 result = -ENODEV;
1577 goto out_ccw2;
1578 }
1579
1580 for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1581 priv->channel[direction] =
1582 channel_get(type, direction == CTCM_READ ?
1583 read_id : write_id, direction);
1584 if (priv->channel[direction] == NULL) {
1585 if (direction == CTCM_WRITE)
1586 channel_free(priv->channel[CTCM_READ]);
1587 result = -ENODEV;
1588 goto out_dev;
1589 }
1590 priv->channel[direction]->netdev = dev;
1591 priv->channel[direction]->protocol = priv->protocol;
1592 priv->channel[direction]->max_bufsize = priv->buffer_size;
1593 }
1594 /* sysfs magic */
1595 SET_NETDEV_DEV(dev, &cgdev->dev);
1596
1597 if (register_netdev(dev)) {
1598 result = -ENODEV;
1599 goto out_dev;
1600 }
1601
1602 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1603
1604 dev_info(&dev->dev,
1605 "setup OK : r/w = %s/%s, protocol : %d\n",
1606 priv->channel[CTCM_READ]->id,
1607 priv->channel[CTCM_WRITE]->id, priv->protocol);
1608
1609 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1610 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1611 priv->channel[CTCM_READ]->id,
1612 priv->channel[CTCM_WRITE]->id, priv->protocol);
1613
1614 return 0;
1615 out_dev:
1616 ctcm_free_netdevice(dev);
1617 out_ccw2:
1618 ccw_device_set_offline(cgdev->cdev[1]);
1619 out_ccw1:
1620 ccw_device_set_offline(cgdev->cdev[0]);
1621 out_remove_channel2:
1622 readc = channel_get(type, read_id, CTCM_READ);
1623 channel_remove(readc);
1624 out_remove_channel1:
1625 writec = channel_get(type, write_id, CTCM_WRITE);
1626 channel_remove(writec);
1627 out_err_result:
1628 return result;
1629 }
1630
1631 /**
1632 * Shutdown an interface.
1633 *
1634 * cgdev Device to be shut down.
1635 *
1636 * returns 0 on success, !0 on failure.
1637 */
ctcm_shutdown_device(struct ccwgroup_device * cgdev)1638 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1639 {
1640 struct ctcm_priv *priv;
1641 struct net_device *dev;
1642
1643 priv = dev_get_drvdata(&cgdev->dev);
1644 if (!priv)
1645 return -ENODEV;
1646
1647 if (priv->channel[CTCM_READ]) {
1648 dev = priv->channel[CTCM_READ]->netdev;
1649 CTCM_DBF_DEV(SETUP, dev, "");
1650 /* Close the device */
1651 ctcm_close(dev);
1652 dev->flags &= ~IFF_RUNNING;
1653 channel_free(priv->channel[CTCM_READ]);
1654 } else
1655 dev = NULL;
1656
1657 if (priv->channel[CTCM_WRITE])
1658 channel_free(priv->channel[CTCM_WRITE]);
1659
1660 if (dev) {
1661 unregister_netdev(dev);
1662 ctcm_free_netdevice(dev);
1663 }
1664
1665 if (priv->fsm)
1666 kfree_fsm(priv->fsm);
1667
1668 ccw_device_set_offline(cgdev->cdev[1]);
1669 ccw_device_set_offline(cgdev->cdev[0]);
1670 channel_remove(priv->channel[CTCM_READ]);
1671 channel_remove(priv->channel[CTCM_WRITE]);
1672 priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1673
1674 return 0;
1675
1676 }
1677
1678
ctcm_remove_device(struct ccwgroup_device * cgdev)1679 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1680 {
1681 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1682
1683 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1684 "removing device %p, proto : %d",
1685 cgdev, priv->protocol);
1686
1687 if (cgdev->state == CCWGROUP_ONLINE)
1688 ctcm_shutdown_device(cgdev);
1689 dev_set_drvdata(&cgdev->dev, NULL);
1690 kfree(priv);
1691 put_device(&cgdev->dev);
1692 }
1693
1694 static struct ccw_device_id ctcm_ids[] = {
1695 {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1696 {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1697 {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1698 {},
1699 };
1700 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1701
1702 static struct ccw_driver ctcm_ccw_driver = {
1703 .driver = {
1704 .owner = THIS_MODULE,
1705 .name = "ctcm",
1706 },
1707 .ids = ctcm_ids,
1708 .probe = ccwgroup_probe_ccwdev,
1709 .remove = ccwgroup_remove_ccwdev,
1710 .int_class = IRQIO_CTC,
1711 };
1712
1713 static struct ccwgroup_driver ctcm_group_driver = {
1714 .driver = {
1715 .owner = THIS_MODULE,
1716 .name = CTC_DRIVER_NAME,
1717 },
1718 .ccw_driver = &ctcm_ccw_driver,
1719 .setup = ctcm_probe_device,
1720 .remove = ctcm_remove_device,
1721 .set_online = ctcm_new_device,
1722 .set_offline = ctcm_shutdown_device,
1723 };
1724
group_store(struct device_driver * ddrv,const char * buf,size_t count)1725 static ssize_t group_store(struct device_driver *ddrv, const char *buf,
1726 size_t count)
1727 {
1728 int err;
1729
1730 err = ccwgroup_create_dev(ctcm_root_dev, &ctcm_group_driver, 2, buf);
1731 return err ? err : count;
1732 }
1733 static DRIVER_ATTR_WO(group);
1734
1735 static struct attribute *ctcm_drv_attrs[] = {
1736 &driver_attr_group.attr,
1737 NULL,
1738 };
1739 static struct attribute_group ctcm_drv_attr_group = {
1740 .attrs = ctcm_drv_attrs,
1741 };
1742 static const struct attribute_group *ctcm_drv_attr_groups[] = {
1743 &ctcm_drv_attr_group,
1744 NULL,
1745 };
1746
1747 /*
1748 * Module related routines
1749 */
1750
1751 /*
1752 * Prepare to be unloaded. Free IRQ's and release all resources.
1753 * This is called just before this module is unloaded. It is
1754 * not called, if the usage count is !0, so we don't need to check
1755 * for that.
1756 */
ctcm_exit(void)1757 static void __exit ctcm_exit(void)
1758 {
1759 ccwgroup_driver_unregister(&ctcm_group_driver);
1760 ccw_driver_unregister(&ctcm_ccw_driver);
1761 root_device_unregister(ctcm_root_dev);
1762 ctcm_unregister_dbf_views();
1763 pr_info("CTCM driver unloaded\n");
1764 }
1765
1766 /*
1767 * Print Banner.
1768 */
print_banner(void)1769 static void print_banner(void)
1770 {
1771 pr_info("CTCM driver initialized\n");
1772 }
1773
1774 /**
1775 * Initialize module.
1776 * This is called just after the module is loaded.
1777 *
1778 * returns 0 on success, !0 on error.
1779 */
ctcm_init(void)1780 static int __init ctcm_init(void)
1781 {
1782 int ret;
1783
1784 channels = NULL;
1785
1786 ret = ctcm_register_dbf_views();
1787 if (ret)
1788 goto out_err;
1789 ctcm_root_dev = root_device_register("ctcm");
1790 ret = PTR_ERR_OR_ZERO(ctcm_root_dev);
1791 if (ret)
1792 goto register_err;
1793 ret = ccw_driver_register(&ctcm_ccw_driver);
1794 if (ret)
1795 goto ccw_err;
1796 ctcm_group_driver.driver.groups = ctcm_drv_attr_groups;
1797 ret = ccwgroup_driver_register(&ctcm_group_driver);
1798 if (ret)
1799 goto ccwgroup_err;
1800 print_banner();
1801 return 0;
1802
1803 ccwgroup_err:
1804 ccw_driver_unregister(&ctcm_ccw_driver);
1805 ccw_err:
1806 root_device_unregister(ctcm_root_dev);
1807 register_err:
1808 ctcm_unregister_dbf_views();
1809 out_err:
1810 pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1811 __func__, ret);
1812 return ret;
1813 }
1814
1815 module_init(ctcm_init);
1816 module_exit(ctcm_exit);
1817
1818 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1819 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1820 MODULE_LICENSE("GPL");
1821
1822