1 /*
2 * drivers/s390/net/ctcm_main.c
3 *
4 * Copyright IBM Corp. 2001, 2007
5 * Author(s):
6 * Original CTC driver(s):
7 * Fritz Elfert (felfert@millenux.com)
8 * Dieter Wellerdiek (wel@de.ibm.com)
9 * Martin Schwidefsky (schwidefsky@de.ibm.com)
10 * Denis Joseph Barrow (barrow_dj@yahoo.com)
11 * Jochen Roehrig (roehrig@de.ibm.com)
12 * Cornelia Huck <cornelia.huck@de.ibm.com>
13 * MPC additions:
14 * Belinda Thompson (belindat@us.ibm.com)
15 * Andy Richter (richtera@us.ibm.com)
16 * Revived by:
17 * Peter Tiedemann (ptiedem@de.ibm.com)
18 */
19
20 #undef DEBUG
21 #undef DEBUGDATA
22 #undef DEBUGCCW
23
24 #define KMSG_COMPONENT "ctcm"
25 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
26
27 #include <linux/module.h>
28 #include <linux/init.h>
29 #include <linux/kernel.h>
30 #include <linux/slab.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/interrupt.h>
34 #include <linux/timer.h>
35 #include <linux/bitops.h>
36
37 #include <linux/signal.h>
38 #include <linux/string.h>
39
40 #include <linux/ip.h>
41 #include <linux/if_arp.h>
42 #include <linux/tcp.h>
43 #include <linux/skbuff.h>
44 #include <linux/ctype.h>
45 #include <net/dst.h>
46
47 #include <linux/io.h>
48 #include <asm/ccwdev.h>
49 #include <asm/ccwgroup.h>
50 #include <linux/uaccess.h>
51
52 #include <asm/idals.h>
53
54 #include "cu3088.h"
55 #include "ctcm_fsms.h"
56 #include "ctcm_main.h"
57
58 /* Some common global variables */
59
60 /*
61 * Linked list of all detected channels.
62 */
63 struct channel *channels;
64
65 /**
66 * Unpack a just received skb and hand it over to
67 * upper layers.
68 *
69 * ch The channel where this skb has been received.
70 * pskb The received skb.
71 */
ctcm_unpack_skb(struct channel * ch,struct sk_buff * pskb)72 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
73 {
74 struct net_device *dev = ch->netdev;
75 struct ctcm_priv *priv = dev->ml_priv;
76 __u16 len = *((__u16 *) pskb->data);
77
78 skb_put(pskb, 2 + LL_HEADER_LENGTH);
79 skb_pull(pskb, 2);
80 pskb->dev = dev;
81 pskb->ip_summed = CHECKSUM_UNNECESSARY;
82 while (len > 0) {
83 struct sk_buff *skb;
84 int skblen;
85 struct ll_header *header = (struct ll_header *)pskb->data;
86
87 skb_pull(pskb, LL_HEADER_LENGTH);
88 if ((ch->protocol == CTCM_PROTO_S390) &&
89 (header->type != ETH_P_IP)) {
90 if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
91 ch->logflags |= LOG_FLAG_ILLEGALPKT;
92 /*
93 * Check packet type only if we stick strictly
94 * to S/390's protocol of OS390. This only
95 * supports IP. Otherwise allow any packet
96 * type.
97 */
98 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
99 "%s(%s): Illegal packet type 0x%04x"
100 " - dropping",
101 CTCM_FUNTAIL, dev->name, header->type);
102 }
103 priv->stats.rx_dropped++;
104 priv->stats.rx_frame_errors++;
105 return;
106 }
107 pskb->protocol = ntohs(header->type);
108 if (header->length <= LL_HEADER_LENGTH) {
109 if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
110 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
111 "%s(%s): Illegal packet size %d(%d,%d)"
112 "- dropping",
113 CTCM_FUNTAIL, dev->name,
114 header->length, dev->mtu, len);
115 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
116 }
117
118 priv->stats.rx_dropped++;
119 priv->stats.rx_length_errors++;
120 return;
121 }
122 header->length -= LL_HEADER_LENGTH;
123 len -= LL_HEADER_LENGTH;
124 if ((header->length > skb_tailroom(pskb)) ||
125 (header->length > len)) {
126 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
127 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
128 "%s(%s): Packet size %d (overrun)"
129 " - dropping", CTCM_FUNTAIL,
130 dev->name, header->length);
131 ch->logflags |= LOG_FLAG_OVERRUN;
132 }
133
134 priv->stats.rx_dropped++;
135 priv->stats.rx_length_errors++;
136 return;
137 }
138 skb_put(pskb, header->length);
139 skb_reset_mac_header(pskb);
140 len -= header->length;
141 skb = dev_alloc_skb(pskb->len);
142 if (!skb) {
143 if (!(ch->logflags & LOG_FLAG_NOMEM)) {
144 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
145 "%s(%s): MEMORY allocation error",
146 CTCM_FUNTAIL, dev->name);
147 ch->logflags |= LOG_FLAG_NOMEM;
148 }
149 priv->stats.rx_dropped++;
150 return;
151 }
152 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
153 pskb->len);
154 skb_reset_mac_header(skb);
155 skb->dev = pskb->dev;
156 skb->protocol = pskb->protocol;
157 pskb->ip_summed = CHECKSUM_UNNECESSARY;
158 skblen = skb->len;
159 /*
160 * reset logflags
161 */
162 ch->logflags = 0;
163 priv->stats.rx_packets++;
164 priv->stats.rx_bytes += skblen;
165 netif_rx_ni(skb);
166 dev->last_rx = jiffies;
167 if (len > 0) {
168 skb_pull(pskb, header->length);
169 if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
170 if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
171 CTCM_DBF_DEV_NAME(TRACE, dev,
172 "Overrun in ctcm_unpack_skb");
173 ch->logflags |= LOG_FLAG_OVERRUN;
174 }
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+1];
203 int ok = 0;
204
205 if (ch == NULL)
206 return;
207 else
208 strncpy(chid, ch->id, CTCM_ID_SIZE);
209
210 channel_free(ch);
211 while (*c) {
212 if (*c == ch) {
213 *c = ch->next;
214 fsm_deltimer(&ch->timer);
215 if (IS_MPC(ch))
216 fsm_deltimer(&ch->sweep_timer);
217
218 kfree_fsm(ch->fsm);
219 clear_normalized_cda(&ch->ccw[4]);
220 if (ch->trans_skb != NULL) {
221 clear_normalized_cda(&ch->ccw[1]);
222 dev_kfree_skb_any(ch->trans_skb);
223 }
224 if (IS_MPC(ch)) {
225 tasklet_kill(&ch->ch_tasklet);
226 tasklet_kill(&ch->ch_disc_tasklet);
227 kfree(ch->discontact_th);
228 }
229 kfree(ch->ccw);
230 kfree(ch->irb);
231 kfree(ch);
232 ok = 1;
233 break;
234 }
235 c = &((*c)->next);
236 }
237
238 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
239 chid, ok ? "OK" : "failed");
240 }
241
242 /**
243 * Get a specific channel from the channel list.
244 *
245 * type Type of channel we are interested in.
246 * id Id of channel we are interested in.
247 * direction Direction we want to use this channel for.
248 *
249 * returns Pointer to a channel or NULL if no matching channel available.
250 */
channel_get(enum channel_types type,char * id,int direction)251 static struct channel *channel_get(enum 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 == 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 inline void ccw_unit_check(struct channel *ch, __u8 sense)
309 {
310 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
311 "%s(%s): %02x",
312 CTCM_FUNTAIL, ch->id, sense);
313
314 if (sense & SNS0_INTERVENTION_REQ) {
315 if (sense & 0x01) {
316 if (ch->sense_rc != 0x01) {
317 pr_notice(
318 "%s: The communication peer has "
319 "disconnected\n", ch->id);
320 ch->sense_rc = 0x01;
321 }
322 fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
323 } else {
324 if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
325 pr_notice(
326 "%s: The remote operating system is "
327 "not available\n", ch->id);
328 ch->sense_rc = SNS0_INTERVENTION_REQ;
329 }
330 fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
331 }
332 } else if (sense & SNS0_EQUIPMENT_CHECK) {
333 if (sense & SNS0_BUS_OUT_CHECK) {
334 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
335 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
336 "%s(%s): remote HW error %02x",
337 CTCM_FUNTAIL, ch->id, sense);
338 ch->sense_rc = SNS0_BUS_OUT_CHECK;
339 }
340 fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
341 } else {
342 if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
343 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
344 "%s(%s): remote read parity error %02x",
345 CTCM_FUNTAIL, ch->id, sense);
346 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
347 }
348 fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
349 }
350 } else if (sense & SNS0_BUS_OUT_CHECK) {
351 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
352 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
353 "%s(%s): BUS OUT error %02x",
354 CTCM_FUNTAIL, ch->id, sense);
355 ch->sense_rc = SNS0_BUS_OUT_CHECK;
356 }
357 if (sense & 0x04) /* data-streaming timeout */
358 fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
359 else /* Data-transfer parity error */
360 fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
361 } else if (sense & SNS0_CMD_REJECT) {
362 if (ch->sense_rc != SNS0_CMD_REJECT) {
363 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
364 "%s(%s): Command rejected",
365 CTCM_FUNTAIL, ch->id);
366 ch->sense_rc = SNS0_CMD_REJECT;
367 }
368 } else if (sense == 0) {
369 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
370 "%s(%s): Unit check ZERO",
371 CTCM_FUNTAIL, ch->id);
372 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
373 } else {
374 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
375 "%s(%s): Unit check code %02x unknown",
376 CTCM_FUNTAIL, ch->id, sense);
377 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
378 }
379 }
380
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) == READ) ? "RX" : "TX");
390 return -ENOMEM;
391 }
392
393 ch->ccw[1].count = ch->max_bufsize;
394 if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
395 dev_kfree_skb(ch->trans_skb);
396 ch->trans_skb = NULL;
397 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
398 "%s(%s): %s set norm_cda failed",
399 CTCM_FUNTAIL, ch->id,
400 (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX");
401 return -ENOMEM;
402 }
403
404 ch->ccw[1].count = 0;
405 ch->trans_skb_data = ch->trans_skb->data;
406 ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
407 return 0;
408 }
409
410 /*
411 * Interface API for upper network layers
412 */
413
414 /**
415 * Open an interface.
416 * Called from generic network layer when ifconfig up is run.
417 *
418 * dev Pointer to interface struct.
419 *
420 * returns 0 on success, -ERRNO on failure. (Never fails.)
421 */
ctcm_open(struct net_device * dev)422 int ctcm_open(struct net_device *dev)
423 {
424 struct ctcm_priv *priv = dev->ml_priv;
425
426 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
427 if (!IS_MPC(priv))
428 fsm_event(priv->fsm, DEV_EVENT_START, dev);
429 return 0;
430 }
431
432 /**
433 * Close an interface.
434 * Called from generic network layer when ifconfig down is run.
435 *
436 * dev Pointer to interface struct.
437 *
438 * returns 0 on success, -ERRNO on failure. (Never fails.)
439 */
ctcm_close(struct net_device * dev)440 int ctcm_close(struct net_device *dev)
441 {
442 struct ctcm_priv *priv = dev->ml_priv;
443
444 CTCMY_DBF_DEV_NAME(SETUP, dev, "");
445 if (!IS_MPC(priv))
446 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
447 return 0;
448 }
449
450
451 /**
452 * Transmit a packet.
453 * This is a helper function for ctcm_tx().
454 *
455 * ch Channel to be used for sending.
456 * skb Pointer to struct sk_buff of packet to send.
457 * The linklevel header has already been set up
458 * by ctcm_tx().
459 *
460 * returns 0 on success, -ERRNO on failure. (Never fails.)
461 */
ctcm_transmit_skb(struct channel * ch,struct sk_buff * skb)462 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
463 {
464 unsigned long saveflags;
465 struct ll_header header;
466 int rc = 0;
467 __u16 block_len;
468 int ccw_idx;
469 struct sk_buff *nskb;
470 unsigned long hi;
471
472 /* we need to acquire the lock for testing the state
473 * otherwise we can have an IRQ changing the state to
474 * TXIDLE after the test but before acquiring the lock.
475 */
476 spin_lock_irqsave(&ch->collect_lock, saveflags);
477 if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
478 int l = skb->len + LL_HEADER_LENGTH;
479
480 if (ch->collect_len + l > ch->max_bufsize - 2) {
481 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
482 return -EBUSY;
483 } else {
484 atomic_inc(&skb->users);
485 header.length = l;
486 header.type = skb->protocol;
487 header.unused = 0;
488 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
489 LL_HEADER_LENGTH);
490 skb_queue_tail(&ch->collect_queue, skb);
491 ch->collect_len += l;
492 }
493 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
494 goto done;
495 }
496 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
497 /*
498 * Protect skb against beeing free'd by upper
499 * layers.
500 */
501 atomic_inc(&skb->users);
502 ch->prof.txlen += skb->len;
503 header.length = skb->len + LL_HEADER_LENGTH;
504 header.type = skb->protocol;
505 header.unused = 0;
506 memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
507 block_len = skb->len + 2;
508 *((__u16 *)skb_push(skb, 2)) = block_len;
509
510 /*
511 * IDAL support in CTCM is broken, so we have to
512 * care about skb's above 2G ourselves.
513 */
514 hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
515 if (hi) {
516 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
517 if (!nskb) {
518 atomic_dec(&skb->users);
519 skb_pull(skb, LL_HEADER_LENGTH + 2);
520 ctcm_clear_busy(ch->netdev);
521 return -ENOMEM;
522 } else {
523 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
524 atomic_inc(&nskb->users);
525 atomic_dec(&skb->users);
526 dev_kfree_skb_irq(skb);
527 skb = nskb;
528 }
529 }
530
531 ch->ccw[4].count = block_len;
532 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
533 /*
534 * idal allocation failed, try via copying to
535 * trans_skb. trans_skb usually has a pre-allocated
536 * idal.
537 */
538 if (ctcm_checkalloc_buffer(ch)) {
539 /*
540 * Remove our header. It gets added
541 * again on retransmit.
542 */
543 atomic_dec(&skb->users);
544 skb_pull(skb, LL_HEADER_LENGTH + 2);
545 ctcm_clear_busy(ch->netdev);
546 return -ENOMEM;
547 }
548
549 skb_reset_tail_pointer(ch->trans_skb);
550 ch->trans_skb->len = 0;
551 ch->ccw[1].count = skb->len;
552 skb_copy_from_linear_data(skb,
553 skb_put(ch->trans_skb, skb->len), skb->len);
554 atomic_dec(&skb->users);
555 dev_kfree_skb_irq(skb);
556 ccw_idx = 0;
557 } else {
558 skb_queue_tail(&ch->io_queue, skb);
559 ccw_idx = 3;
560 }
561 ch->retry = 0;
562 fsm_newstate(ch->fsm, CTC_STATE_TX);
563 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
564 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
565 ch->prof.send_stamp = current_kernel_time(); /* xtime */
566 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
567 (unsigned long)ch, 0xff, 0);
568 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
569 if (ccw_idx == 3)
570 ch->prof.doios_single++;
571 if (rc != 0) {
572 fsm_deltimer(&ch->timer);
573 ctcm_ccw_check_rc(ch, rc, "single skb TX");
574 if (ccw_idx == 3)
575 skb_dequeue_tail(&ch->io_queue);
576 /*
577 * Remove our header. It gets added
578 * again on retransmit.
579 */
580 skb_pull(skb, LL_HEADER_LENGTH + 2);
581 } else if (ccw_idx == 0) {
582 struct net_device *dev = ch->netdev;
583 struct ctcm_priv *priv = dev->ml_priv;
584 priv->stats.tx_packets++;
585 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
586 }
587 done:
588 ctcm_clear_busy(ch->netdev);
589 return rc;
590 }
591
ctcmpc_send_sweep_req(struct channel * rch)592 static void ctcmpc_send_sweep_req(struct channel *rch)
593 {
594 struct net_device *dev = rch->netdev;
595 struct ctcm_priv *priv;
596 struct mpc_group *grp;
597 struct th_sweep *header;
598 struct sk_buff *sweep_skb;
599 struct channel *ch;
600 /* int rc = 0; */
601
602 priv = dev->ml_priv;
603 grp = priv->mpcg;
604 ch = priv->channel[WRITE];
605
606 /* sweep processing is not complete until response and request */
607 /* has completed for all read channels in group */
608 if (grp->in_sweep == 0) {
609 grp->in_sweep = 1;
610 grp->sweep_rsp_pend_num = grp->active_channels[READ];
611 grp->sweep_req_pend_num = grp->active_channels[READ];
612 }
613
614 sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
615
616 if (sweep_skb == NULL) {
617 /* rc = -ENOMEM; */
618 goto nomem;
619 }
620
621 header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
622
623 if (!header) {
624 dev_kfree_skb_any(sweep_skb);
625 /* rc = -ENOMEM; */
626 goto nomem;
627 }
628
629 header->th.th_seg = 0x00 ;
630 header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */
631 header->th.th_blk_flag = 0x00;
632 header->th.th_is_xid = 0x00;
633 header->th.th_seq_num = 0x00;
634 header->sw.th_last_seq = ch->th_seq_num;
635
636 memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
637
638 kfree(header);
639
640 dev->trans_start = jiffies;
641 skb_queue_tail(&ch->sweep_queue, sweep_skb);
642
643 fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
644
645 return;
646
647 nomem:
648 grp->in_sweep = 0;
649 ctcm_clear_busy(dev);
650 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
651
652 return;
653 }
654
655 /*
656 * MPC mode version of transmit_skb
657 */
ctcmpc_transmit_skb(struct channel * ch,struct sk_buff * skb)658 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
659 {
660 struct pdu *p_header;
661 struct net_device *dev = ch->netdev;
662 struct ctcm_priv *priv = dev->ml_priv;
663 struct mpc_group *grp = priv->mpcg;
664 struct th_header *header;
665 struct sk_buff *nskb;
666 int rc = 0;
667 int ccw_idx;
668 unsigned long hi;
669 unsigned long saveflags = 0; /* avoids compiler warning */
670 __u16 block_len;
671
672 CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
673 __func__, dev->name, smp_processor_id(), ch,
674 ch->id, fsm_getstate_str(ch->fsm));
675
676 if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
677 spin_lock_irqsave(&ch->collect_lock, saveflags);
678 atomic_inc(&skb->users);
679 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
680
681 if (!p_header) {
682 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
683 goto nomem_exit;
684 }
685
686 p_header->pdu_offset = skb->len;
687 p_header->pdu_proto = 0x01;
688 p_header->pdu_flag = 0x00;
689 if (skb->protocol == ntohs(ETH_P_SNAP)) {
690 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
691 } else {
692 p_header->pdu_flag |= PDU_FIRST;
693 }
694 p_header->pdu_seq = 0;
695 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header,
696 PDU_HEADER_LENGTH);
697
698 CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n"
699 "pdu header and data for up to 32 bytes:\n",
700 __func__, dev->name, skb->len);
701 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
702
703 skb_queue_tail(&ch->collect_queue, skb);
704 ch->collect_len += skb->len;
705 kfree(p_header);
706
707 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
708 goto done;
709 }
710
711 /*
712 * Protect skb against beeing free'd by upper
713 * layers.
714 */
715 atomic_inc(&skb->users);
716
717 block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
718 /*
719 * IDAL support in CTCM is broken, so we have to
720 * care about skb's above 2G ourselves.
721 */
722 hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
723 if (hi) {
724 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
725 if (!nskb) {
726 goto nomem_exit;
727 } else {
728 memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
729 atomic_inc(&nskb->users);
730 atomic_dec(&skb->users);
731 dev_kfree_skb_irq(skb);
732 skb = nskb;
733 }
734 }
735
736 p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
737
738 if (!p_header)
739 goto nomem_exit;
740
741 p_header->pdu_offset = skb->len;
742 p_header->pdu_proto = 0x01;
743 p_header->pdu_flag = 0x00;
744 p_header->pdu_seq = 0;
745 if (skb->protocol == ntohs(ETH_P_SNAP)) {
746 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
747 } else {
748 p_header->pdu_flag |= PDU_FIRST;
749 }
750 memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
751
752 kfree(p_header);
753
754 if (ch->collect_len > 0) {
755 spin_lock_irqsave(&ch->collect_lock, saveflags);
756 skb_queue_tail(&ch->collect_queue, skb);
757 ch->collect_len += skb->len;
758 skb = skb_dequeue(&ch->collect_queue);
759 ch->collect_len -= skb->len;
760 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
761 }
762
763 p_header = (struct pdu *)skb->data;
764 p_header->pdu_flag |= PDU_LAST;
765
766 ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
767
768 header = kmalloc(TH_HEADER_LENGTH, gfp_type());
769 if (!header)
770 goto nomem_exit;
771
772 header->th_seg = 0x00;
773 header->th_ch_flag = TH_HAS_PDU; /* Normal data */
774 header->th_blk_flag = 0x00;
775 header->th_is_xid = 0x00; /* Just data here */
776 ch->th_seq_num++;
777 header->th_seq_num = ch->th_seq_num;
778
779 CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
780 __func__, dev->name, ch->th_seq_num);
781
782 /* put the TH on the packet */
783 memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
784
785 kfree(header);
786
787 CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
788 "up to 32 bytes sent to vtam:\n",
789 __func__, dev->name, skb->len);
790 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
791
792 ch->ccw[4].count = skb->len;
793 if (set_normalized_cda(&ch->ccw[4], skb->data)) {
794 /*
795 * idal allocation failed, try via copying to trans_skb.
796 * trans_skb usually has a pre-allocated idal.
797 */
798 if (ctcm_checkalloc_buffer(ch)) {
799 /*
800 * Remove our header.
801 * It gets added again on retransmit.
802 */
803 goto nomem_exit;
804 }
805
806 skb_reset_tail_pointer(ch->trans_skb);
807 ch->trans_skb->len = 0;
808 ch->ccw[1].count = skb->len;
809 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
810 atomic_dec(&skb->users);
811 dev_kfree_skb_irq(skb);
812 ccw_idx = 0;
813 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
814 "up to 32 bytes sent to vtam:\n",
815 __func__, dev->name, ch->trans_skb->len);
816 CTCM_D3_DUMP((char *)ch->trans_skb->data,
817 min_t(int, 32, ch->trans_skb->len));
818 } else {
819 skb_queue_tail(&ch->io_queue, skb);
820 ccw_idx = 3;
821 }
822 ch->retry = 0;
823 fsm_newstate(ch->fsm, CTC_STATE_TX);
824 fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
825
826 if (do_debug_ccw)
827 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
828 sizeof(struct ccw1) * 3);
829
830 spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
831 ch->prof.send_stamp = current_kernel_time(); /* xtime */
832 rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
833 (unsigned long)ch, 0xff, 0);
834 spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
835 if (ccw_idx == 3)
836 ch->prof.doios_single++;
837 if (rc != 0) {
838 fsm_deltimer(&ch->timer);
839 ctcm_ccw_check_rc(ch, rc, "single skb TX");
840 if (ccw_idx == 3)
841 skb_dequeue_tail(&ch->io_queue);
842 } else if (ccw_idx == 0) {
843 priv->stats.tx_packets++;
844 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
845 }
846 if (ch->th_seq_num > 0xf0000000) /* Chose at random. */
847 ctcmpc_send_sweep_req(ch);
848
849 goto done;
850 nomem_exit:
851 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
852 "%s(%s): MEMORY allocation ERROR\n",
853 CTCM_FUNTAIL, ch->id);
854 rc = -ENOMEM;
855 atomic_dec(&skb->users);
856 dev_kfree_skb_any(skb);
857 fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
858 done:
859 CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
860 return rc;
861 }
862
863 /**
864 * Start transmission of a packet.
865 * Called from generic network device layer.
866 *
867 * skb Pointer to buffer containing the packet.
868 * dev Pointer to interface struct.
869 *
870 * returns 0 if packet consumed, !0 if packet rejected.
871 * Note: If we return !0, then the packet is free'd by
872 * the generic network layer.
873 */
874 /* first merge version - leaving both functions separated */
ctcm_tx(struct sk_buff * skb,struct net_device * dev)875 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
876 {
877 struct ctcm_priv *priv = dev->ml_priv;
878
879 if (skb == NULL) {
880 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
881 "%s(%s): NULL sk_buff passed",
882 CTCM_FUNTAIL, dev->name);
883 priv->stats.tx_dropped++;
884 return 0;
885 }
886 if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
887 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
888 "%s(%s): Got sk_buff with head room < %ld bytes",
889 CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
890 dev_kfree_skb(skb);
891 priv->stats.tx_dropped++;
892 return 0;
893 }
894
895 /*
896 * If channels are not running, try to restart them
897 * and throw away packet.
898 */
899 if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
900 fsm_event(priv->fsm, DEV_EVENT_START, dev);
901 dev_kfree_skb(skb);
902 priv->stats.tx_dropped++;
903 priv->stats.tx_errors++;
904 priv->stats.tx_carrier_errors++;
905 return 0;
906 }
907
908 if (ctcm_test_and_set_busy(dev))
909 return -EBUSY;
910
911 dev->trans_start = jiffies;
912 if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0)
913 return 1;
914 return 0;
915 }
916
917 /* unmerged MPC variant of ctcm_tx */
ctcmpc_tx(struct sk_buff * skb,struct net_device * dev)918 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
919 {
920 int len = 0;
921 struct ctcm_priv *priv = dev->ml_priv;
922 struct mpc_group *grp = priv->mpcg;
923 struct sk_buff *newskb = NULL;
924
925 /*
926 * Some sanity checks ...
927 */
928 if (skb == NULL) {
929 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
930 "%s(%s): NULL sk_buff passed",
931 CTCM_FUNTAIL, dev->name);
932 priv->stats.tx_dropped++;
933 goto done;
934 }
935 if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
936 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
937 "%s(%s): Got sk_buff with head room < %ld bytes",
938 CTCM_FUNTAIL, dev->name,
939 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
940
941 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
942
943 len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
944 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
945
946 if (!newskb) {
947 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
948 "%s: %s: __dev_alloc_skb failed",
949 __func__, dev->name);
950
951 dev_kfree_skb_any(skb);
952 priv->stats.tx_dropped++;
953 priv->stats.tx_errors++;
954 priv->stats.tx_carrier_errors++;
955 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
956 goto done;
957 }
958 newskb->protocol = skb->protocol;
959 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
960 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
961 dev_kfree_skb_any(skb);
962 skb = newskb;
963 }
964
965 /*
966 * If channels are not running,
967 * notify anybody about a link failure and throw
968 * away packet.
969 */
970 if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
971 (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) {
972 dev_kfree_skb_any(skb);
973 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
974 "%s(%s): inactive MPCGROUP - dropped",
975 CTCM_FUNTAIL, dev->name);
976 priv->stats.tx_dropped++;
977 priv->stats.tx_errors++;
978 priv->stats.tx_carrier_errors++;
979 goto done;
980 }
981
982 if (ctcm_test_and_set_busy(dev)) {
983 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
984 "%s(%s): device busy - dropped",
985 CTCM_FUNTAIL, dev->name);
986 dev_kfree_skb_any(skb);
987 priv->stats.tx_dropped++;
988 priv->stats.tx_errors++;
989 priv->stats.tx_carrier_errors++;
990 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
991 goto done;
992 }
993
994 dev->trans_start = jiffies;
995 if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) {
996 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
997 "%s(%s): device error - dropped",
998 CTCM_FUNTAIL, dev->name);
999 dev_kfree_skb_any(skb);
1000 priv->stats.tx_dropped++;
1001 priv->stats.tx_errors++;
1002 priv->stats.tx_carrier_errors++;
1003 ctcm_clear_busy(dev);
1004 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1005 goto done;
1006 }
1007 ctcm_clear_busy(dev);
1008 done:
1009 if (do_debug)
1010 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1011
1012 return 0; /* handle freeing of skb here */
1013 }
1014
1015
1016 /**
1017 * Sets MTU of an interface.
1018 *
1019 * dev Pointer to interface struct.
1020 * new_mtu The new MTU to use for this interface.
1021 *
1022 * returns 0 on success, -EINVAL if MTU is out of valid range.
1023 * (valid range is 576 .. 65527). If VM is on the
1024 * remote side, maximum MTU is 32760, however this is
1025 * not checked here.
1026 */
ctcm_change_mtu(struct net_device * dev,int new_mtu)1027 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1028 {
1029 struct ctcm_priv *priv;
1030 int max_bufsize;
1031
1032 if (new_mtu < 576 || new_mtu > 65527)
1033 return -EINVAL;
1034
1035 priv = dev->ml_priv;
1036 max_bufsize = priv->channel[READ]->max_bufsize;
1037
1038 if (IS_MPC(priv)) {
1039 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1040 return -EINVAL;
1041 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1042 } else {
1043 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1044 return -EINVAL;
1045 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1046 }
1047 dev->mtu = new_mtu;
1048 return 0;
1049 }
1050
1051 /**
1052 * Returns interface statistics of a device.
1053 *
1054 * dev Pointer to interface struct.
1055 *
1056 * returns Pointer to stats struct of this interface.
1057 */
ctcm_stats(struct net_device * dev)1058 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1059 {
1060 return &((struct ctcm_priv *)dev->ml_priv)->stats;
1061 }
1062
ctcm_free_netdevice(struct net_device * dev)1063 static void ctcm_free_netdevice(struct net_device *dev)
1064 {
1065 struct ctcm_priv *priv;
1066 struct mpc_group *grp;
1067
1068 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1069 "%s(%s)", CTCM_FUNTAIL, dev->name);
1070 priv = dev->ml_priv;
1071 if (priv) {
1072 grp = priv->mpcg;
1073 if (grp) {
1074 if (grp->fsm)
1075 kfree_fsm(grp->fsm);
1076 if (grp->xid_skb)
1077 dev_kfree_skb(grp->xid_skb);
1078 if (grp->rcvd_xid_skb)
1079 dev_kfree_skb(grp->rcvd_xid_skb);
1080 tasklet_kill(&grp->mpc_tasklet2);
1081 kfree(grp);
1082 priv->mpcg = NULL;
1083 }
1084 if (priv->fsm) {
1085 kfree_fsm(priv->fsm);
1086 priv->fsm = NULL;
1087 }
1088 kfree(priv->xid);
1089 priv->xid = NULL;
1090 /*
1091 * Note: kfree(priv); is done in "opposite" function of
1092 * allocator function probe_device which is remove_device.
1093 */
1094 }
1095 #ifdef MODULE
1096 free_netdev(dev);
1097 #endif
1098 }
1099
1100 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1101
ctcm_dev_setup(struct net_device * dev)1102 void static ctcm_dev_setup(struct net_device *dev)
1103 {
1104 dev->open = ctcm_open;
1105 dev->stop = ctcm_close;
1106 dev->get_stats = ctcm_stats;
1107 dev->change_mtu = ctcm_change_mtu;
1108 dev->type = ARPHRD_SLIP;
1109 dev->tx_queue_len = 100;
1110 dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1111 }
1112
1113 /*
1114 * Initialize everything of the net device except the name and the
1115 * channel structs.
1116 */
ctcm_init_netdevice(struct ctcm_priv * priv)1117 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1118 {
1119 struct net_device *dev;
1120 struct mpc_group *grp;
1121 if (!priv)
1122 return NULL;
1123
1124 if (IS_MPC(priv))
1125 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1126 else
1127 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1128
1129 if (!dev) {
1130 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1131 "%s: MEMORY allocation ERROR",
1132 CTCM_FUNTAIL);
1133 return NULL;
1134 }
1135 dev->ml_priv = priv;
1136 priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1137 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1138 dev_fsm, dev_fsm_len, GFP_KERNEL);
1139 if (priv->fsm == NULL) {
1140 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1141 kfree(dev);
1142 return NULL;
1143 }
1144 fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1145 fsm_settimer(priv->fsm, &priv->restart_timer);
1146
1147 if (IS_MPC(priv)) {
1148 /* MPC Group Initializations */
1149 grp = ctcmpc_init_mpc_group(priv);
1150 if (grp == NULL) {
1151 MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1152 kfree(dev);
1153 return NULL;
1154 }
1155 tasklet_init(&grp->mpc_tasklet2,
1156 mpc_group_ready, (unsigned long)dev);
1157 dev->mtu = MPC_BUFSIZE_DEFAULT -
1158 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1159
1160 dev->hard_start_xmit = ctcmpc_tx;
1161 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1162 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1163 } else {
1164 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1165 dev->hard_start_xmit = ctcm_tx;
1166 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1167 }
1168
1169 CTCMY_DBF_DEV(SETUP, dev, "finished");
1170
1171 return dev;
1172 }
1173
1174 /**
1175 * Main IRQ handler.
1176 *
1177 * cdev The ccw_device the interrupt is for.
1178 * intparm interruption parameter.
1179 * irb interruption response block.
1180 */
ctcm_irq_handler(struct ccw_device * cdev,unsigned long intparm,struct irb * irb)1181 static void ctcm_irq_handler(struct ccw_device *cdev,
1182 unsigned long intparm, struct irb *irb)
1183 {
1184 struct channel *ch;
1185 struct net_device *dev;
1186 struct ctcm_priv *priv;
1187 struct ccwgroup_device *cgdev;
1188 int cstat;
1189 int dstat;
1190
1191 CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1192 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1193
1194 if (ctcm_check_irb_error(cdev, irb))
1195 return;
1196
1197 cgdev = dev_get_drvdata(&cdev->dev);
1198
1199 cstat = irb->scsw.cmd.cstat;
1200 dstat = irb->scsw.cmd.dstat;
1201
1202 /* Check for unsolicited interrupts. */
1203 if (cgdev == NULL) {
1204 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1205 "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1206 CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1207 dev_warn(&cdev->dev,
1208 "The adapter received a non-specific IRQ\n");
1209 return;
1210 }
1211
1212 priv = dev_get_drvdata(&cgdev->dev);
1213
1214 /* Try to extract channel from driver data. */
1215 if (priv->channel[READ]->cdev == cdev)
1216 ch = priv->channel[READ];
1217 else if (priv->channel[WRITE]->cdev == cdev)
1218 ch = priv->channel[WRITE];
1219 else {
1220 dev_err(&cdev->dev,
1221 "%s: Internal error: Can't determine channel for "
1222 "interrupt device %s\n",
1223 __func__, dev_name(&cdev->dev));
1224 /* Explain: inconsistent internal structures */
1225 return;
1226 }
1227
1228 dev = ch->netdev;
1229 if (dev == NULL) {
1230 dev_err(&cdev->dev,
1231 "%s Internal error: net_device is NULL, ch = 0x%p\n",
1232 __func__, ch);
1233 /* Explain: inconsistent internal structures */
1234 return;
1235 }
1236
1237 /* Copy interruption response block. */
1238 memcpy(ch->irb, irb, sizeof(struct irb));
1239
1240 /* Issue error message and return on subchannel error code */
1241 if (irb->scsw.cmd.cstat) {
1242 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1243 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1244 "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1245 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1246 dev_warn(&cdev->dev,
1247 "A check occurred on the subchannel\n");
1248 return;
1249 }
1250
1251 /* Check the reason-code of a unit check */
1252 if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1253 if ((irb->ecw[0] & ch->sense_rc) == 0)
1254 /* print it only once */
1255 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1256 "%s(%s): sense=%02x, ds=%02x",
1257 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1258 ccw_unit_check(ch, irb->ecw[0]);
1259 return;
1260 }
1261 if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1262 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1263 fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1264 else
1265 fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1266 return;
1267 }
1268 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1269 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1270 return;
1271 }
1272 if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1273 (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1274 (irb->scsw.cmd.stctl ==
1275 (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1276 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1277 else
1278 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1279
1280 }
1281
1282 /**
1283 * Add ctcm specific attributes.
1284 * Add ctcm private data.
1285 *
1286 * cgdev pointer to ccwgroup_device just added
1287 *
1288 * returns 0 on success, !0 on failure.
1289 */
ctcm_probe_device(struct ccwgroup_device * cgdev)1290 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1291 {
1292 struct ctcm_priv *priv;
1293 int rc;
1294
1295 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1296 "%s %p",
1297 __func__, cgdev);
1298
1299 if (!get_device(&cgdev->dev))
1300 return -ENODEV;
1301
1302 priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1303 if (!priv) {
1304 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1305 "%s: memory allocation failure",
1306 CTCM_FUNTAIL);
1307 put_device(&cgdev->dev);
1308 return -ENOMEM;
1309 }
1310
1311 rc = ctcm_add_files(&cgdev->dev);
1312 if (rc) {
1313 kfree(priv);
1314 put_device(&cgdev->dev);
1315 return rc;
1316 }
1317 priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1318 cgdev->cdev[0]->handler = ctcm_irq_handler;
1319 cgdev->cdev[1]->handler = ctcm_irq_handler;
1320 dev_set_drvdata(&cgdev->dev, priv);
1321
1322 return 0;
1323 }
1324
1325 /**
1326 * Add a new channel to the list of channels.
1327 * Keeps the channel list sorted.
1328 *
1329 * cdev The ccw_device to be added.
1330 * type The type class of the new channel.
1331 * priv Points to the private data of the ccwgroup_device.
1332 *
1333 * returns 0 on success, !0 on error.
1334 */
add_channel(struct ccw_device * cdev,enum channel_types type,struct ctcm_priv * priv)1335 static int add_channel(struct ccw_device *cdev, enum channel_types type,
1336 struct ctcm_priv *priv)
1337 {
1338 struct channel **c = &channels;
1339 struct channel *ch;
1340 int ccw_num;
1341 int rc = 0;
1342
1343 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1344 "%s(%s), type %d, proto %d",
1345 __func__, dev_name(&cdev->dev), type, priv->protocol);
1346
1347 ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1348 if (ch == NULL)
1349 return -ENOMEM;
1350
1351 ch->protocol = priv->protocol;
1352 if (IS_MPC(priv)) {
1353 ch->discontact_th = (struct th_header *)
1354 kzalloc(TH_HEADER_LENGTH, gfp_type());
1355 if (ch->discontact_th == NULL)
1356 goto nomem_return;
1357
1358 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1359 tasklet_init(&ch->ch_disc_tasklet,
1360 mpc_action_send_discontact, (unsigned long)ch);
1361
1362 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1363 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1364 ccw_num = 17;
1365 } else
1366 ccw_num = 8;
1367
1368 ch->ccw = (struct ccw1 *)
1369 kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1370 if (ch->ccw == NULL)
1371 goto nomem_return;
1372
1373 ch->cdev = cdev;
1374 snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1375 ch->type = type;
1376
1377 /**
1378 * "static" ccws are used in the following way:
1379 *
1380 * ccw[0..2] (Channel program for generic I/O):
1381 * 0: prepare
1382 * 1: read or write (depending on direction) with fixed
1383 * buffer (idal allocated once when buffer is allocated)
1384 * 2: nop
1385 * ccw[3..5] (Channel program for direct write of packets)
1386 * 3: prepare
1387 * 4: write (idal allocated on every write).
1388 * 5: nop
1389 * ccw[6..7] (Channel program for initial channel setup):
1390 * 6: set extended mode
1391 * 7: nop
1392 *
1393 * ch->ccw[0..5] are initialized in ch_action_start because
1394 * the channel's direction is yet unknown here.
1395 *
1396 * ccws used for xid2 negotiations
1397 * ch-ccw[8-14] need to be used for the XID exchange either
1398 * X side XID2 Processing
1399 * 8: write control
1400 * 9: write th
1401 * 10: write XID
1402 * 11: read th from secondary
1403 * 12: read XID from secondary
1404 * 13: read 4 byte ID
1405 * 14: nop
1406 * Y side XID Processing
1407 * 8: sense
1408 * 9: read th
1409 * 10: read XID
1410 * 11: write th
1411 * 12: write XID
1412 * 13: write 4 byte ID
1413 * 14: nop
1414 *
1415 * ccws used for double noop due to VM timing issues
1416 * which result in unrecoverable Busy on channel
1417 * 15: nop
1418 * 16: nop
1419 */
1420 ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED;
1421 ch->ccw[6].flags = CCW_FLAG_SLI;
1422
1423 ch->ccw[7].cmd_code = CCW_CMD_NOOP;
1424 ch->ccw[7].flags = CCW_FLAG_SLI;
1425
1426 if (IS_MPC(priv)) {
1427 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1428 ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC;
1429 ch->ccw[15].count = TH_HEADER_LENGTH;
1430 ch->ccw[15].cda = virt_to_phys(ch->discontact_th);
1431
1432 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1433 ch->ccw[16].flags = CCW_FLAG_SLI;
1434
1435 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1436 ctc_ch_event_names, CTC_MPC_NR_STATES,
1437 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1438 mpc_ch_fsm_len, GFP_KERNEL);
1439 } else {
1440 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1441 ctc_ch_event_names, CTC_NR_STATES,
1442 CTC_NR_EVENTS, ch_fsm,
1443 ch_fsm_len, GFP_KERNEL);
1444 }
1445 if (ch->fsm == NULL)
1446 goto free_return;
1447
1448 fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1449
1450 ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1451 if (ch->irb == NULL)
1452 goto nomem_return;
1453
1454 while (*c && ctcm_less_than((*c)->id, ch->id))
1455 c = &(*c)->next;
1456
1457 if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1458 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1459 "%s (%s) already in list, using old entry",
1460 __func__, (*c)->id);
1461
1462 goto free_return;
1463 }
1464
1465 spin_lock_init(&ch->collect_lock);
1466
1467 fsm_settimer(ch->fsm, &ch->timer);
1468 skb_queue_head_init(&ch->io_queue);
1469 skb_queue_head_init(&ch->collect_queue);
1470
1471 if (IS_MPC(priv)) {
1472 fsm_settimer(ch->fsm, &ch->sweep_timer);
1473 skb_queue_head_init(&ch->sweep_queue);
1474 }
1475 ch->next = *c;
1476 *c = ch;
1477 return 0;
1478
1479 nomem_return:
1480 rc = -ENOMEM;
1481
1482 free_return: /* note that all channel pointers are 0 or valid */
1483 kfree(ch->ccw);
1484 kfree(ch->discontact_th);
1485 kfree_fsm(ch->fsm);
1486 kfree(ch->irb);
1487 kfree(ch);
1488 return rc;
1489 }
1490
1491 /*
1492 * Return type of a detected device.
1493 */
get_channel_type(struct ccw_device_id * id)1494 static enum channel_types get_channel_type(struct ccw_device_id *id)
1495 {
1496 enum channel_types type;
1497 type = (enum channel_types)id->driver_info;
1498
1499 if (type == channel_type_ficon)
1500 type = channel_type_escon;
1501
1502 return type;
1503 }
1504
1505 /**
1506 *
1507 * Setup an interface.
1508 *
1509 * cgdev Device to be setup.
1510 *
1511 * returns 0 on success, !0 on failure.
1512 */
ctcm_new_device(struct ccwgroup_device * cgdev)1513 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1514 {
1515 char read_id[CTCM_ID_SIZE];
1516 char write_id[CTCM_ID_SIZE];
1517 int direction;
1518 enum channel_types type;
1519 struct ctcm_priv *priv;
1520 struct net_device *dev;
1521 struct ccw_device *cdev0;
1522 struct ccw_device *cdev1;
1523 int ret;
1524
1525 priv = dev_get_drvdata(&cgdev->dev);
1526 if (!priv)
1527 return -ENODEV;
1528
1529 cdev0 = cgdev->cdev[0];
1530 cdev1 = cgdev->cdev[1];
1531
1532 type = get_channel_type(&cdev0->id);
1533
1534 snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1535 snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1536
1537 ret = add_channel(cdev0, type, priv);
1538 if (ret)
1539 return ret;
1540 ret = add_channel(cdev1, type, priv);
1541 if (ret)
1542 return ret;
1543
1544 ret = ccw_device_set_online(cdev0);
1545 if (ret != 0) {
1546 /* may be ok to fail now - can be done later */
1547 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1548 "%s(%s) set_online rc=%d",
1549 CTCM_FUNTAIL, read_id, ret);
1550 }
1551
1552 ret = ccw_device_set_online(cdev1);
1553 if (ret != 0) {
1554 /* may be ok to fail now - can be done later */
1555 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1556 "%s(%s) set_online rc=%d",
1557 CTCM_FUNTAIL, write_id, ret);
1558 }
1559
1560 dev = ctcm_init_netdevice(priv);
1561 if (dev == NULL)
1562 goto out;
1563
1564 for (direction = READ; direction <= WRITE; direction++) {
1565 priv->channel[direction] =
1566 channel_get(type, direction == READ ? read_id : write_id,
1567 direction);
1568 if (priv->channel[direction] == NULL) {
1569 if (direction == WRITE)
1570 channel_free(priv->channel[READ]);
1571 goto out_dev;
1572 }
1573 priv->channel[direction]->netdev = dev;
1574 priv->channel[direction]->protocol = priv->protocol;
1575 priv->channel[direction]->max_bufsize = priv->buffer_size;
1576 }
1577 /* sysfs magic */
1578 SET_NETDEV_DEV(dev, &cgdev->dev);
1579
1580 if (register_netdev(dev))
1581 goto out_dev;
1582
1583 if (ctcm_add_attributes(&cgdev->dev)) {
1584 unregister_netdev(dev);
1585 goto out_dev;
1586 }
1587
1588 strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1589
1590 dev_info(&dev->dev,
1591 "setup OK : r/w = %s/%s, protocol : %d\n",
1592 priv->channel[READ]->id,
1593 priv->channel[WRITE]->id, priv->protocol);
1594
1595 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1596 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1597 priv->channel[READ]->id,
1598 priv->channel[WRITE]->id, priv->protocol);
1599
1600 return 0;
1601 out_dev:
1602 ctcm_free_netdevice(dev);
1603 out:
1604 ccw_device_set_offline(cgdev->cdev[1]);
1605 ccw_device_set_offline(cgdev->cdev[0]);
1606
1607 return -ENODEV;
1608 }
1609
1610 /**
1611 * Shutdown an interface.
1612 *
1613 * cgdev Device to be shut down.
1614 *
1615 * returns 0 on success, !0 on failure.
1616 */
ctcm_shutdown_device(struct ccwgroup_device * cgdev)1617 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1618 {
1619 struct ctcm_priv *priv;
1620 struct net_device *dev;
1621
1622 priv = dev_get_drvdata(&cgdev->dev);
1623 if (!priv)
1624 return -ENODEV;
1625
1626 if (priv->channel[READ]) {
1627 dev = priv->channel[READ]->netdev;
1628 CTCM_DBF_DEV(SETUP, dev, "");
1629 /* Close the device */
1630 ctcm_close(dev);
1631 dev->flags &= ~IFF_RUNNING;
1632 ctcm_remove_attributes(&cgdev->dev);
1633 channel_free(priv->channel[READ]);
1634 } else
1635 dev = NULL;
1636
1637 if (priv->channel[WRITE])
1638 channel_free(priv->channel[WRITE]);
1639
1640 if (dev) {
1641 unregister_netdev(dev);
1642 ctcm_free_netdevice(dev);
1643 }
1644
1645 if (priv->fsm)
1646 kfree_fsm(priv->fsm);
1647
1648 ccw_device_set_offline(cgdev->cdev[1]);
1649 ccw_device_set_offline(cgdev->cdev[0]);
1650
1651 if (priv->channel[READ])
1652 channel_remove(priv->channel[READ]);
1653 if (priv->channel[WRITE])
1654 channel_remove(priv->channel[WRITE]);
1655 priv->channel[READ] = priv->channel[WRITE] = NULL;
1656
1657 return 0;
1658
1659 }
1660
1661
ctcm_remove_device(struct ccwgroup_device * cgdev)1662 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1663 {
1664 struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1665
1666 BUG_ON(priv == NULL);
1667
1668 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1669 "removing device %s, r/w = %s/%s, proto : %d",
1670 priv->channel[READ]->netdev->name,
1671 priv->channel[READ]->id, priv->channel[WRITE]->id,
1672 priv->protocol);
1673
1674 if (cgdev->state == CCWGROUP_ONLINE)
1675 ctcm_shutdown_device(cgdev);
1676 ctcm_remove_files(&cgdev->dev);
1677 dev_set_drvdata(&cgdev->dev, NULL);
1678 kfree(priv);
1679 put_device(&cgdev->dev);
1680 }
1681
1682 static struct ccwgroup_driver ctcm_group_driver = {
1683 .owner = THIS_MODULE,
1684 .name = CTC_DRIVER_NAME,
1685 .max_slaves = 2,
1686 .driver_id = 0xC3E3C3D4, /* CTCM */
1687 .probe = ctcm_probe_device,
1688 .remove = ctcm_remove_device,
1689 .set_online = ctcm_new_device,
1690 .set_offline = ctcm_shutdown_device,
1691 };
1692
1693
1694 /*
1695 * Module related routines
1696 */
1697
1698 /*
1699 * Prepare to be unloaded. Free IRQ's and release all resources.
1700 * This is called just before this module is unloaded. It is
1701 * not called, if the usage count is !0, so we don't need to check
1702 * for that.
1703 */
ctcm_exit(void)1704 static void __exit ctcm_exit(void)
1705 {
1706 unregister_cu3088_discipline(&ctcm_group_driver);
1707 ctcm_unregister_dbf_views();
1708 pr_info("CTCM driver unloaded\n");
1709 }
1710
1711 /*
1712 * Print Banner.
1713 */
print_banner(void)1714 static void print_banner(void)
1715 {
1716 pr_info("CTCM driver initialized\n");
1717 }
1718
1719 /**
1720 * Initialize module.
1721 * This is called just after the module is loaded.
1722 *
1723 * returns 0 on success, !0 on error.
1724 */
ctcm_init(void)1725 static int __init ctcm_init(void)
1726 {
1727 int ret;
1728
1729 channels = NULL;
1730
1731 ret = ctcm_register_dbf_views();
1732 if (ret) {
1733 return ret;
1734 }
1735 ret = register_cu3088_discipline(&ctcm_group_driver);
1736 if (ret) {
1737 ctcm_unregister_dbf_views();
1738 pr_err("%s / register_cu3088_discipline failed, ret = %d\n",
1739 __func__, ret);
1740 return ret;
1741 }
1742 print_banner();
1743 return ret;
1744 }
1745
1746 module_init(ctcm_init);
1747 module_exit(ctcm_exit);
1748
1749 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1750 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1751 MODULE_LICENSE("GPL");
1752
1753