s390: use free_netdev(netdev) instead of kfree()
[linux-2.6.git] / drivers / s390 / net / ctcm_main.c
1 /*
2  * drivers/s390/net/ctcm_main.c
3  *
4  * Copyright IBM Corp. 2001, 2009
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 "ctcm_fsms.h"
55 #include "ctcm_main.h"
56
57 /* Some common global variables */
58
59 /**
60  * The root device for ctcm group devices
61  */
62 static struct device *ctcm_root_dev;
63
64 /*
65  * Linked list of all detected channels.
66  */
67 struct channel *channels;
68
69 /**
70  * Unpack a just received skb and hand it over to
71  * upper layers.
72  *
73  *  ch          The channel where this skb has been received.
74  *  pskb        The received skb.
75  */
76 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
77 {
78         struct net_device *dev = ch->netdev;
79         struct ctcm_priv *priv = dev->ml_priv;
80         __u16 len = *((__u16 *) pskb->data);
81
82         skb_put(pskb, 2 + LL_HEADER_LENGTH);
83         skb_pull(pskb, 2);
84         pskb->dev = dev;
85         pskb->ip_summed = CHECKSUM_UNNECESSARY;
86         while (len > 0) {
87                 struct sk_buff *skb;
88                 int skblen;
89                 struct ll_header *header = (struct ll_header *)pskb->data;
90
91                 skb_pull(pskb, LL_HEADER_LENGTH);
92                 if ((ch->protocol == CTCM_PROTO_S390) &&
93                     (header->type != ETH_P_IP)) {
94                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
95                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
96                                 /*
97                                  * Check packet type only if we stick strictly
98                                  * to S/390's protocol of OS390. This only
99                                  * supports IP. Otherwise allow any packet
100                                  * type.
101                                  */
102                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
103                                         "%s(%s): Illegal packet type 0x%04x"
104                                         " - dropping",
105                                         CTCM_FUNTAIL, dev->name, header->type);
106                         }
107                         priv->stats.rx_dropped++;
108                         priv->stats.rx_frame_errors++;
109                         return;
110                 }
111                 pskb->protocol = ntohs(header->type);
112                 if ((header->length <= LL_HEADER_LENGTH) ||
113                     (len <= LL_HEADER_LENGTH)) {
114                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
115                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
116                                         "%s(%s): Illegal packet size %d(%d,%d)"
117                                         "- dropping",
118                                         CTCM_FUNTAIL, dev->name,
119                                         header->length, dev->mtu, len);
120                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
121                         }
122
123                         priv->stats.rx_dropped++;
124                         priv->stats.rx_length_errors++;
125                         return;
126                 }
127                 header->length -= LL_HEADER_LENGTH;
128                 len -= LL_HEADER_LENGTH;
129                 if ((header->length > skb_tailroom(pskb)) ||
130                         (header->length > len)) {
131                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
132                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
133                                         "%s(%s): Packet size %d (overrun)"
134                                         " - dropping", CTCM_FUNTAIL,
135                                                 dev->name, header->length);
136                                 ch->logflags |= LOG_FLAG_OVERRUN;
137                         }
138
139                         priv->stats.rx_dropped++;
140                         priv->stats.rx_length_errors++;
141                         return;
142                 }
143                 skb_put(pskb, header->length);
144                 skb_reset_mac_header(pskb);
145                 len -= header->length;
146                 skb = dev_alloc_skb(pskb->len);
147                 if (!skb) {
148                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
149                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
150                                         "%s(%s): MEMORY allocation error",
151                                                 CTCM_FUNTAIL, dev->name);
152                                 ch->logflags |= LOG_FLAG_NOMEM;
153                         }
154                         priv->stats.rx_dropped++;
155                         return;
156                 }
157                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
158                                           pskb->len);
159                 skb_reset_mac_header(skb);
160                 skb->dev = pskb->dev;
161                 skb->protocol = pskb->protocol;
162                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
163                 skblen = skb->len;
164                 /*
165                  * reset logflags
166                  */
167                 ch->logflags = 0;
168                 priv->stats.rx_packets++;
169                 priv->stats.rx_bytes += skblen;
170                 netif_rx_ni(skb);
171                 if (len > 0) {
172                         skb_pull(pskb, header->length);
173                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
174                                 CTCM_DBF_DEV_NAME(TRACE, dev,
175                                         "Overrun in ctcm_unpack_skb");
176                                 ch->logflags |= LOG_FLAG_OVERRUN;
177                                 return;
178                         }
179                         skb_put(pskb, LL_HEADER_LENGTH);
180                 }
181         }
182 }
183
184 /**
185  * Release a specific channel in the channel list.
186  *
187  *  ch          Pointer to channel struct to be released.
188  */
189 static void channel_free(struct channel *ch)
190 {
191         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
192         ch->flags &= ~CHANNEL_FLAGS_INUSE;
193         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
194 }
195
196 /**
197  * Remove a specific channel in the channel list.
198  *
199  *  ch          Pointer to channel struct to be released.
200  */
201 static void channel_remove(struct channel *ch)
202 {
203         struct channel **c = &channels;
204         char chid[CTCM_ID_SIZE+1];
205         int ok = 0;
206
207         if (ch == NULL)
208                 return;
209         else
210                 strncpy(chid, ch->id, CTCM_ID_SIZE);
211
212         channel_free(ch);
213         while (*c) {
214                 if (*c == ch) {
215                         *c = ch->next;
216                         fsm_deltimer(&ch->timer);
217                         if (IS_MPC(ch))
218                                 fsm_deltimer(&ch->sweep_timer);
219
220                         kfree_fsm(ch->fsm);
221                         clear_normalized_cda(&ch->ccw[4]);
222                         if (ch->trans_skb != NULL) {
223                                 clear_normalized_cda(&ch->ccw[1]);
224                                 dev_kfree_skb_any(ch->trans_skb);
225                         }
226                         if (IS_MPC(ch)) {
227                                 tasklet_kill(&ch->ch_tasklet);
228                                 tasklet_kill(&ch->ch_disc_tasklet);
229                                 kfree(ch->discontact_th);
230                         }
231                         kfree(ch->ccw);
232                         kfree(ch->irb);
233                         kfree(ch);
234                         ok = 1;
235                         break;
236                 }
237                 c = &((*c)->next);
238         }
239
240         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
241                         chid, ok ? "OK" : "failed");
242 }
243
244 /**
245  * Get a specific channel from the channel list.
246  *
247  *  type        Type of channel we are interested in.
248  *  id          Id of channel we are interested in.
249  *  direction   Direction we want to use this channel for.
250  *
251  * returns Pointer to a channel or NULL if no matching channel available.
252  */
253 static struct channel *channel_get(enum ctcm_channel_types type,
254                                         char *id, int direction)
255 {
256         struct channel *ch = channels;
257
258         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
259                 ch = ch->next;
260         if (!ch) {
261                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
262                                 "%s(%d, %s, %d) not found in channel list\n",
263                                 CTCM_FUNTAIL, type, id, direction);
264         } else {
265                 if (ch->flags & CHANNEL_FLAGS_INUSE)
266                         ch = NULL;
267                 else {
268                         ch->flags |= CHANNEL_FLAGS_INUSE;
269                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
270                         ch->flags |= (direction == CTCM_WRITE)
271                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
272                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
273                 }
274         }
275         return ch;
276 }
277
278 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
279 {
280         if (!IS_ERR(irb))
281                 return 0;
282
283         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
284                         "irb error %ld on device %s\n",
285                                 PTR_ERR(irb), dev_name(&cdev->dev));
286
287         switch (PTR_ERR(irb)) {
288         case -EIO:
289                 dev_err(&cdev->dev,
290                         "An I/O-error occurred on the CTCM device\n");
291                 break;
292         case -ETIMEDOUT:
293                 dev_err(&cdev->dev,
294                         "An adapter hardware operation timed out\n");
295                 break;
296         default:
297                 dev_err(&cdev->dev,
298                         "An error occurred on the adapter hardware\n");
299         }
300         return PTR_ERR(irb);
301 }
302
303
304 /**
305  * Check sense of a unit check.
306  *
307  *  ch          The channel, the sense code belongs to.
308  *  sense       The sense code to inspect.
309  */
310 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
311 {
312         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
313                         "%s(%s): %02x",
314                                 CTCM_FUNTAIL, ch->id, sense);
315
316         if (sense & SNS0_INTERVENTION_REQ) {
317                 if (sense & 0x01) {
318                         if (ch->sense_rc != 0x01) {
319                                 pr_notice(
320                                         "%s: The communication peer has "
321                                         "disconnected\n", ch->id);
322                                 ch->sense_rc = 0x01;
323                         }
324                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
325                 } else {
326                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
327                                 pr_notice(
328                                         "%s: The remote operating system is "
329                                         "not available\n", ch->id);
330                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
331                         }
332                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
333                 }
334         } else if (sense & SNS0_EQUIPMENT_CHECK) {
335                 if (sense & SNS0_BUS_OUT_CHECK) {
336                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
337                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
338                                         "%s(%s): remote HW error %02x",
339                                                 CTCM_FUNTAIL, ch->id, sense);
340                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
341                         }
342                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
343                 } else {
344                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
345                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
346                                         "%s(%s): remote read parity error %02x",
347                                                 CTCM_FUNTAIL, ch->id, sense);
348                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
349                         }
350                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
351                 }
352         } else if (sense & SNS0_BUS_OUT_CHECK) {
353                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
354                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
355                                 "%s(%s): BUS OUT error %02x",
356                                         CTCM_FUNTAIL, ch->id, sense);
357                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
358                 }
359                 if (sense & 0x04)       /* data-streaming timeout */
360                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
361                 else                    /* Data-transfer parity error */
362                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
363         } else if (sense & SNS0_CMD_REJECT) {
364                 if (ch->sense_rc != SNS0_CMD_REJECT) {
365                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
366                                 "%s(%s): Command rejected",
367                                                 CTCM_FUNTAIL, ch->id);
368                         ch->sense_rc = SNS0_CMD_REJECT;
369                 }
370         } else if (sense == 0) {
371                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
372                         "%s(%s): Unit check ZERO",
373                                         CTCM_FUNTAIL, ch->id);
374                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
375         } else {
376                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
377                         "%s(%s): Unit check code %02x unknown",
378                                         CTCM_FUNTAIL, ch->id, sense);
379                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
380         }
381 }
382
383 int ctcm_ch_alloc_buffer(struct channel *ch)
384 {
385         clear_normalized_cda(&ch->ccw[1]);
386         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
387         if (ch->trans_skb == NULL) {
388                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
389                         "%s(%s): %s trans_skb allocation error",
390                         CTCM_FUNTAIL, ch->id,
391                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
392                                 "RX" : "TX");
393                 return -ENOMEM;
394         }
395
396         ch->ccw[1].count = ch->max_bufsize;
397         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
398                 dev_kfree_skb(ch->trans_skb);
399                 ch->trans_skb = NULL;
400                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
401                         "%s(%s): %s set norm_cda failed",
402                         CTCM_FUNTAIL, ch->id,
403                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
404                                 "RX" : "TX");
405                 return -ENOMEM;
406         }
407
408         ch->ccw[1].count = 0;
409         ch->trans_skb_data = ch->trans_skb->data;
410         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
411         return 0;
412 }
413
414 /*
415  * Interface API for upper network layers
416  */
417
418 /**
419  * Open an interface.
420  * Called from generic network layer when ifconfig up is run.
421  *
422  *  dev         Pointer to interface struct.
423  *
424  * returns 0 on success, -ERRNO on failure. (Never fails.)
425  */
426 int ctcm_open(struct net_device *dev)
427 {
428         struct ctcm_priv *priv = dev->ml_priv;
429
430         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
431         if (!IS_MPC(priv))
432                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
433         return 0;
434 }
435
436 /**
437  * Close an interface.
438  * Called from generic network layer when ifconfig down is run.
439  *
440  *  dev         Pointer to interface struct.
441  *
442  * returns 0 on success, -ERRNO on failure. (Never fails.)
443  */
444 int ctcm_close(struct net_device *dev)
445 {
446         struct ctcm_priv *priv = dev->ml_priv;
447
448         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
449         if (!IS_MPC(priv))
450                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
451         return 0;
452 }
453
454
455 /**
456  * Transmit a packet.
457  * This is a helper function for ctcm_tx().
458  *
459  *  ch          Channel to be used for sending.
460  *  skb         Pointer to struct sk_buff of packet to send.
461  *            The linklevel header has already been set up
462  *            by ctcm_tx().
463  *
464  * returns 0 on success, -ERRNO on failure. (Never fails.)
465  */
466 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
467 {
468         unsigned long saveflags;
469         struct ll_header header;
470         int rc = 0;
471         __u16 block_len;
472         int ccw_idx;
473         struct sk_buff *nskb;
474         unsigned long hi;
475
476         /* we need to acquire the lock for testing the state
477          * otherwise we can have an IRQ changing the state to
478          * TXIDLE after the test but before acquiring the lock.
479          */
480         spin_lock_irqsave(&ch->collect_lock, saveflags);
481         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
482                 int l = skb->len + LL_HEADER_LENGTH;
483
484                 if (ch->collect_len + l > ch->max_bufsize - 2) {
485                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
486                         return -EBUSY;
487                 } else {
488                         atomic_inc(&skb->users);
489                         header.length = l;
490                         header.type = skb->protocol;
491                         header.unused = 0;
492                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
493                                LL_HEADER_LENGTH);
494                         skb_queue_tail(&ch->collect_queue, skb);
495                         ch->collect_len += l;
496                 }
497                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
498                                 goto done;
499         }
500         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
501         /*
502          * Protect skb against beeing free'd by upper
503          * layers.
504          */
505         atomic_inc(&skb->users);
506         ch->prof.txlen += skb->len;
507         header.length = skb->len + LL_HEADER_LENGTH;
508         header.type = skb->protocol;
509         header.unused = 0;
510         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
511         block_len = skb->len + 2;
512         *((__u16 *)skb_push(skb, 2)) = block_len;
513
514         /*
515          * IDAL support in CTCM is broken, so we have to
516          * care about skb's above 2G ourselves.
517          */
518         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
519         if (hi) {
520                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
521                 if (!nskb) {
522                         atomic_dec(&skb->users);
523                         skb_pull(skb, LL_HEADER_LENGTH + 2);
524                         ctcm_clear_busy(ch->netdev);
525                         return -ENOMEM;
526                 } else {
527                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
528                         atomic_inc(&nskb->users);
529                         atomic_dec(&skb->users);
530                         dev_kfree_skb_irq(skb);
531                         skb = nskb;
532                 }
533         }
534
535         ch->ccw[4].count = block_len;
536         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
537                 /*
538                  * idal allocation failed, try via copying to
539                  * trans_skb. trans_skb usually has a pre-allocated
540                  * idal.
541                  */
542                 if (ctcm_checkalloc_buffer(ch)) {
543                         /*
544                          * Remove our header. It gets added
545                          * again on retransmit.
546                          */
547                         atomic_dec(&skb->users);
548                         skb_pull(skb, LL_HEADER_LENGTH + 2);
549                         ctcm_clear_busy(ch->netdev);
550                         return -ENOMEM;
551                 }
552
553                 skb_reset_tail_pointer(ch->trans_skb);
554                 ch->trans_skb->len = 0;
555                 ch->ccw[1].count = skb->len;
556                 skb_copy_from_linear_data(skb,
557                                 skb_put(ch->trans_skb, skb->len), skb->len);
558                 atomic_dec(&skb->users);
559                 dev_kfree_skb_irq(skb);
560                 ccw_idx = 0;
561         } else {
562                 skb_queue_tail(&ch->io_queue, skb);
563                 ccw_idx = 3;
564         }
565         ch->retry = 0;
566         fsm_newstate(ch->fsm, CTC_STATE_TX);
567         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
568         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
569         ch->prof.send_stamp = current_kernel_time(); /* xtime */
570         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
571                                         (unsigned long)ch, 0xff, 0);
572         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
573         if (ccw_idx == 3)
574                 ch->prof.doios_single++;
575         if (rc != 0) {
576                 fsm_deltimer(&ch->timer);
577                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
578                 if (ccw_idx == 3)
579                         skb_dequeue_tail(&ch->io_queue);
580                 /*
581                  * Remove our header. It gets added
582                  * again on retransmit.
583                  */
584                 skb_pull(skb, LL_HEADER_LENGTH + 2);
585         } else if (ccw_idx == 0) {
586                 struct net_device *dev = ch->netdev;
587                 struct ctcm_priv *priv = dev->ml_priv;
588                 priv->stats.tx_packets++;
589                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
590         }
591 done:
592         ctcm_clear_busy(ch->netdev);
593         return rc;
594 }
595
596 static void ctcmpc_send_sweep_req(struct channel *rch)
597 {
598         struct net_device *dev = rch->netdev;
599         struct ctcm_priv *priv;
600         struct mpc_group *grp;
601         struct th_sweep *header;
602         struct sk_buff *sweep_skb;
603         struct channel *ch;
604         /* int rc = 0; */
605
606         priv = dev->ml_priv;
607         grp = priv->mpcg;
608         ch = priv->channel[CTCM_WRITE];
609
610         /* sweep processing is not complete until response and request */
611         /* has completed for all read channels in group                */
612         if (grp->in_sweep == 0) {
613                 grp->in_sweep = 1;
614                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
615                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
616         }
617
618         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
619
620         if (sweep_skb == NULL)  {
621                 /* rc = -ENOMEM; */
622                                 goto nomem;
623         }
624
625         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
626
627         if (!header) {
628                 dev_kfree_skb_any(sweep_skb);
629                 /* rc = -ENOMEM; */
630                                 goto nomem;
631         }
632
633         header->th.th_seg       = 0x00 ;
634         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
635         header->th.th_blk_flag  = 0x00;
636         header->th.th_is_xid    = 0x00;
637         header->th.th_seq_num   = 0x00;
638         header->sw.th_last_seq  = ch->th_seq_num;
639
640         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
641
642         kfree(header);
643
644         dev->trans_start = jiffies;
645         skb_queue_tail(&ch->sweep_queue, sweep_skb);
646
647         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
648
649         return;
650
651 nomem:
652         grp->in_sweep = 0;
653         ctcm_clear_busy(dev);
654         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
655
656         return;
657 }
658
659 /*
660  * MPC mode version of transmit_skb
661  */
662 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
663 {
664         struct pdu *p_header;
665         struct net_device *dev = ch->netdev;
666         struct ctcm_priv *priv = dev->ml_priv;
667         struct mpc_group *grp = priv->mpcg;
668         struct th_header *header;
669         struct sk_buff *nskb;
670         int rc = 0;
671         int ccw_idx;
672         unsigned long hi;
673         unsigned long saveflags = 0;    /* avoids compiler warning */
674         __u16 block_len;
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                 atomic_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 (skb->protocol == ntohs(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         atomic_inc(&skb->users);
720
721         block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
722         /*
723          * IDAL support in CTCM is broken, so we have to
724          * care about skb's above 2G ourselves.
725          */
726         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
727         if (hi) {
728                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
729                 if (!nskb) {
730                         goto nomem_exit;
731                 } else {
732                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
733                         atomic_inc(&nskb->users);
734                         atomic_dec(&skb->users);
735                         dev_kfree_skb_irq(skb);
736                         skb = nskb;
737                 }
738         }
739
740         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
741
742         if (!p_header)
743                 goto nomem_exit;
744
745         p_header->pdu_offset = skb->len;
746         p_header->pdu_proto = 0x01;
747         p_header->pdu_flag = 0x00;
748         p_header->pdu_seq = 0;
749         if (skb->protocol == ntohs(ETH_P_SNAP)) {
750                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
751         } else {
752                 p_header->pdu_flag |= PDU_FIRST;
753         }
754         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
755
756         kfree(p_header);
757
758         if (ch->collect_len > 0) {
759                 spin_lock_irqsave(&ch->collect_lock, saveflags);
760                 skb_queue_tail(&ch->collect_queue, skb);
761                 ch->collect_len += skb->len;
762                 skb = skb_dequeue(&ch->collect_queue);
763                 ch->collect_len -= skb->len;
764                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
765         }
766
767         p_header = (struct pdu *)skb->data;
768         p_header->pdu_flag |= PDU_LAST;
769
770         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
771
772         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
773         if (!header)
774                 goto nomem_exit;
775
776         header->th_seg = 0x00;
777         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
778         header->th_blk_flag = 0x00;
779         header->th_is_xid = 0x00;          /* Just data here */
780         ch->th_seq_num++;
781         header->th_seq_num = ch->th_seq_num;
782
783         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
784                        __func__, dev->name, ch->th_seq_num);
785
786         /* put the TH on the packet */
787         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
788
789         kfree(header);
790
791         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
792                         "up to 32 bytes sent to vtam:\n",
793                                 __func__, dev->name, skb->len);
794         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
795
796         ch->ccw[4].count = skb->len;
797         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
798                 /*
799                  * idal allocation failed, try via copying to trans_skb.
800                  * trans_skb usually has a pre-allocated idal.
801                  */
802                 if (ctcm_checkalloc_buffer(ch)) {
803                         /*
804                          * Remove our header.
805                          * It gets added again on retransmit.
806                          */
807                                 goto nomem_exit;
808                 }
809
810                 skb_reset_tail_pointer(ch->trans_skb);
811                 ch->trans_skb->len = 0;
812                 ch->ccw[1].count = skb->len;
813                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
814                 atomic_dec(&skb->users);
815                 dev_kfree_skb_irq(skb);
816                 ccw_idx = 0;
817                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
818                                 "up to 32 bytes sent to vtam:\n",
819                                 __func__, dev->name, ch->trans_skb->len);
820                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
821                                 min_t(int, 32, ch->trans_skb->len));
822         } else {
823                 skb_queue_tail(&ch->io_queue, skb);
824                 ccw_idx = 3;
825         }
826         ch->retry = 0;
827         fsm_newstate(ch->fsm, CTC_STATE_TX);
828         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
829
830         if (do_debug_ccw)
831                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
832                                         sizeof(struct ccw1) * 3);
833
834         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
835         ch->prof.send_stamp = current_kernel_time(); /* xtime */
836         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
837                                         (unsigned long)ch, 0xff, 0);
838         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
839         if (ccw_idx == 3)
840                 ch->prof.doios_single++;
841         if (rc != 0) {
842                 fsm_deltimer(&ch->timer);
843                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
844                 if (ccw_idx == 3)
845                         skb_dequeue_tail(&ch->io_queue);
846         } else if (ccw_idx == 0) {
847                 priv->stats.tx_packets++;
848                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
849         }
850         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
851                 ctcmpc_send_sweep_req(ch);
852
853         goto done;
854 nomem_exit:
855         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
856                         "%s(%s): MEMORY allocation ERROR\n",
857                         CTCM_FUNTAIL, ch->id);
858         rc = -ENOMEM;
859         atomic_dec(&skb->users);
860         dev_kfree_skb_any(skb);
861         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
862 done:
863         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
864         return rc;
865 }
866
867 /**
868  * Start transmission of a packet.
869  * Called from generic network device layer.
870  *
871  *  skb         Pointer to buffer containing the packet.
872  *  dev         Pointer to interface struct.
873  *
874  * returns 0 if packet consumed, !0 if packet rejected.
875  *         Note: If we return !0, then the packet is free'd by
876  *               the generic network layer.
877  */
878 /* first merge version - leaving both functions separated */
879 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
880 {
881         struct ctcm_priv *priv = dev->ml_priv;
882
883         if (skb == NULL) {
884                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
885                                 "%s(%s): NULL sk_buff passed",
886                                         CTCM_FUNTAIL, dev->name);
887                 priv->stats.tx_dropped++;
888                 return NETDEV_TX_OK;
889         }
890         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
891                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
892                         "%s(%s): Got sk_buff with head room < %ld bytes",
893                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
894                 dev_kfree_skb(skb);
895                 priv->stats.tx_dropped++;
896                 return NETDEV_TX_OK;
897         }
898
899         /*
900          * If channels are not running, try to restart them
901          * and throw away packet.
902          */
903         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
904                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
905                 dev_kfree_skb(skb);
906                 priv->stats.tx_dropped++;
907                 priv->stats.tx_errors++;
908                 priv->stats.tx_carrier_errors++;
909                 return NETDEV_TX_OK;
910         }
911
912         if (ctcm_test_and_set_busy(dev))
913                 return NETDEV_TX_BUSY;
914
915         dev->trans_start = jiffies;
916         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
917                 return NETDEV_TX_BUSY;
918         return NETDEV_TX_OK;
919 }
920
921 /* unmerged MPC variant of ctcm_tx */
922 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
923 {
924         int len = 0;
925         struct ctcm_priv *priv = dev->ml_priv;
926         struct mpc_group *grp  = priv->mpcg;
927         struct sk_buff *newskb = NULL;
928
929         /*
930          * Some sanity checks ...
931          */
932         if (skb == NULL) {
933                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
934                         "%s(%s): NULL sk_buff passed",
935                                         CTCM_FUNTAIL, dev->name);
936                 priv->stats.tx_dropped++;
937                                         goto done;
938         }
939         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
940                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
941                         "%s(%s): Got sk_buff with head room < %ld bytes",
942                         CTCM_FUNTAIL, dev->name,
943                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
944
945                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
946
947                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
948                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
949
950                 if (!newskb) {
951                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
952                                 "%s: %s: __dev_alloc_skb failed",
953                                                 __func__, dev->name);
954
955                         dev_kfree_skb_any(skb);
956                         priv->stats.tx_dropped++;
957                         priv->stats.tx_errors++;
958                         priv->stats.tx_carrier_errors++;
959                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
960                                         goto done;
961                 }
962                 newskb->protocol = skb->protocol;
963                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
964                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
965                 dev_kfree_skb_any(skb);
966                 skb = newskb;
967         }
968
969         /*
970          * If channels are not running,
971          * notify anybody about a link failure and throw
972          * away packet.
973          */
974         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
975            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
976                 dev_kfree_skb_any(skb);
977                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
978                         "%s(%s): inactive MPCGROUP - dropped",
979                                         CTCM_FUNTAIL, dev->name);
980                 priv->stats.tx_dropped++;
981                 priv->stats.tx_errors++;
982                 priv->stats.tx_carrier_errors++;
983                                         goto done;
984         }
985
986         if (ctcm_test_and_set_busy(dev)) {
987                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
988                         "%s(%s): device busy - dropped",
989                                         CTCM_FUNTAIL, dev->name);
990                 dev_kfree_skb_any(skb);
991                 priv->stats.tx_dropped++;
992                 priv->stats.tx_errors++;
993                 priv->stats.tx_carrier_errors++;
994                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
995                                         goto done;
996         }
997
998         dev->trans_start = jiffies;
999         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
1000                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1001                         "%s(%s): device error - dropped",
1002                                         CTCM_FUNTAIL, dev->name);
1003                 dev_kfree_skb_any(skb);
1004                 priv->stats.tx_dropped++;
1005                 priv->stats.tx_errors++;
1006                 priv->stats.tx_carrier_errors++;
1007                 ctcm_clear_busy(dev);
1008                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1009                                         goto done;
1010         }
1011         ctcm_clear_busy(dev);
1012 done:
1013         if (do_debug)
1014                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1015
1016         return NETDEV_TX_OK;    /* handle freeing of skb here */
1017 }
1018
1019
1020 /**
1021  * Sets MTU of an interface.
1022  *
1023  *  dev         Pointer to interface struct.
1024  *  new_mtu     The new MTU to use for this interface.
1025  *
1026  * returns 0 on success, -EINVAL if MTU is out of valid range.
1027  *         (valid range is 576 .. 65527). If VM is on the
1028  *         remote side, maximum MTU is 32760, however this is
1029  *         not checked here.
1030  */
1031 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1032 {
1033         struct ctcm_priv *priv;
1034         int max_bufsize;
1035
1036         if (new_mtu < 576 || new_mtu > 65527)
1037                 return -EINVAL;
1038
1039         priv = dev->ml_priv;
1040         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1041
1042         if (IS_MPC(priv)) {
1043                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1044                         return -EINVAL;
1045                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1046         } else {
1047                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1048                         return -EINVAL;
1049                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1050         }
1051         dev->mtu = new_mtu;
1052         return 0;
1053 }
1054
1055 /**
1056  * Returns interface statistics of a device.
1057  *
1058  *  dev         Pointer to interface struct.
1059  *
1060  * returns Pointer to stats struct of this interface.
1061  */
1062 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1063 {
1064         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1065 }
1066
1067 static void ctcm_free_netdevice(struct net_device *dev)
1068 {
1069         struct ctcm_priv *priv;
1070         struct mpc_group *grp;
1071
1072         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1073                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1074         priv = dev->ml_priv;
1075         if (priv) {
1076                 grp = priv->mpcg;
1077                 if (grp) {
1078                         if (grp->fsm)
1079                                 kfree_fsm(grp->fsm);
1080                         if (grp->xid_skb)
1081                                 dev_kfree_skb(grp->xid_skb);
1082                         if (grp->rcvd_xid_skb)
1083                                 dev_kfree_skb(grp->rcvd_xid_skb);
1084                         tasklet_kill(&grp->mpc_tasklet2);
1085                         kfree(grp);
1086                         priv->mpcg = NULL;
1087                 }
1088                 if (priv->fsm) {
1089                         kfree_fsm(priv->fsm);
1090                         priv->fsm = NULL;
1091                 }
1092                 kfree(priv->xid);
1093                 priv->xid = NULL;
1094         /*
1095          * Note: kfree(priv); is done in "opposite" function of
1096          * allocator function probe_device which is remove_device.
1097          */
1098         }
1099 #ifdef MODULE
1100         free_netdev(dev);
1101 #endif
1102 }
1103
1104 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1105
1106 static const struct net_device_ops ctcm_netdev_ops = {
1107         .ndo_open               = ctcm_open,
1108         .ndo_stop               = ctcm_close,
1109         .ndo_get_stats          = ctcm_stats,
1110         .ndo_change_mtu         = ctcm_change_mtu,
1111         .ndo_start_xmit         = ctcm_tx,
1112 };
1113
1114 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1115         .ndo_open               = ctcm_open,
1116         .ndo_stop               = ctcm_close,
1117         .ndo_get_stats          = ctcm_stats,
1118         .ndo_change_mtu         = ctcm_change_mtu,
1119         .ndo_start_xmit         = ctcmpc_tx,
1120 };
1121
1122 void static ctcm_dev_setup(struct net_device *dev)
1123 {
1124         dev->type = ARPHRD_SLIP;
1125         dev->tx_queue_len = 100;
1126         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1127 }
1128
1129 /*
1130  * Initialize everything of the net device except the name and the
1131  * channel structs.
1132  */
1133 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1134 {
1135         struct net_device *dev;
1136         struct mpc_group *grp;
1137         if (!priv)
1138                 return NULL;
1139
1140         if (IS_MPC(priv))
1141                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1142         else
1143                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1144
1145         if (!dev) {
1146                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1147                         "%s: MEMORY allocation ERROR",
1148                         CTCM_FUNTAIL);
1149                 return NULL;
1150         }
1151         dev->ml_priv = priv;
1152         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1153                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1154                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1155         if (priv->fsm == NULL) {
1156                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1157                 free_netdev(dev);
1158                 return NULL;
1159         }
1160         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1161         fsm_settimer(priv->fsm, &priv->restart_timer);
1162
1163         if (IS_MPC(priv)) {
1164                 /*  MPC Group Initializations  */
1165                 grp = ctcmpc_init_mpc_group(priv);
1166                 if (grp == NULL) {
1167                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1168                         free_netdev(dev);
1169                         return NULL;
1170                 }
1171                 tasklet_init(&grp->mpc_tasklet2,
1172                                 mpc_group_ready, (unsigned long)dev);
1173                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1174                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1175
1176                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1177                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1178                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1179         } else {
1180                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1181                 dev->netdev_ops = &ctcm_netdev_ops;
1182                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1183         }
1184
1185         CTCMY_DBF_DEV(SETUP, dev, "finished");
1186
1187         return dev;
1188 }
1189
1190 /**
1191  * Main IRQ handler.
1192  *
1193  *  cdev        The ccw_device the interrupt is for.
1194  *  intparm     interruption parameter.
1195  *  irb         interruption response block.
1196  */
1197 static void ctcm_irq_handler(struct ccw_device *cdev,
1198                                 unsigned long intparm, struct irb *irb)
1199 {
1200         struct channel          *ch;
1201         struct net_device       *dev;
1202         struct ctcm_priv        *priv;
1203         struct ccwgroup_device  *cgdev;
1204         int cstat;
1205         int dstat;
1206
1207         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
1208                 "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev));
1209
1210         if (ctcm_check_irb_error(cdev, irb))
1211                 return;
1212
1213         cgdev = dev_get_drvdata(&cdev->dev);
1214
1215         cstat = irb->scsw.cmd.cstat;
1216         dstat = irb->scsw.cmd.dstat;
1217
1218         /* Check for unsolicited interrupts. */
1219         if (cgdev == NULL) {
1220                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR,
1221                         "%s(%s) unsolicited irq: c-%02x d-%02x\n",
1222                         CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat);
1223                 dev_warn(&cdev->dev,
1224                         "The adapter received a non-specific IRQ\n");
1225                 return;
1226         }
1227
1228         priv = dev_get_drvdata(&cgdev->dev);
1229
1230         /* Try to extract channel from driver data. */
1231         if (priv->channel[CTCM_READ]->cdev == cdev)
1232                 ch = priv->channel[CTCM_READ];
1233         else if (priv->channel[CTCM_WRITE]->cdev == cdev)
1234                 ch = priv->channel[CTCM_WRITE];
1235         else {
1236                 dev_err(&cdev->dev,
1237                         "%s: Internal error: Can't determine channel for "
1238                         "interrupt device %s\n",
1239                         __func__, dev_name(&cdev->dev));
1240                         /* Explain: inconsistent internal structures */
1241                 return;
1242         }
1243
1244         dev = ch->netdev;
1245         if (dev == NULL) {
1246                 dev_err(&cdev->dev,
1247                         "%s Internal error: net_device is NULL, ch = 0x%p\n",
1248                         __func__, ch);
1249                         /* Explain: inconsistent internal structures */
1250                 return;
1251         }
1252
1253         /* Copy interruption response block. */
1254         memcpy(ch->irb, irb, sizeof(struct irb));
1255
1256         /* Issue error message and return on subchannel error code */
1257         if (irb->scsw.cmd.cstat) {
1258                 fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch);
1259                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1260                         "%s(%s): sub-ch check %s: cs=%02x ds=%02x",
1261                                 CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat);
1262                 dev_warn(&cdev->dev,
1263                                 "A check occurred on the subchannel\n");
1264                 return;
1265         }
1266
1267         /* Check the reason-code of a unit check */
1268         if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) {
1269                 if ((irb->ecw[0] & ch->sense_rc) == 0)
1270                         /* print it only once */
1271                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
1272                                 "%s(%s): sense=%02x, ds=%02x",
1273                                 CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat);
1274                 ccw_unit_check(ch, irb->ecw[0]);
1275                 return;
1276         }
1277         if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) {
1278                 if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION)
1279                         fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch);
1280                 else
1281                         fsm_event(ch->fsm, CTC_EVENT_BUSY, ch);
1282                 return;
1283         }
1284         if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
1285                 fsm_event(ch->fsm, CTC_EVENT_ATTN, ch);
1286                 return;
1287         }
1288         if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) ||
1289             (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) ||
1290             (irb->scsw.cmd.stctl ==
1291              (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND)))
1292                 fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch);
1293         else
1294                 fsm_event(ch->fsm, CTC_EVENT_IRQ, ch);
1295
1296 }
1297
1298 /**
1299  * Add ctcm specific attributes.
1300  * Add ctcm private data.
1301  *
1302  *  cgdev       pointer to ccwgroup_device just added
1303  *
1304  * returns 0 on success, !0 on failure.
1305  */
1306 static int ctcm_probe_device(struct ccwgroup_device *cgdev)
1307 {
1308         struct ctcm_priv *priv;
1309         int rc;
1310
1311         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1312                         "%s %p",
1313                         __func__, cgdev);
1314
1315         if (!get_device(&cgdev->dev))
1316                 return -ENODEV;
1317
1318         priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL);
1319         if (!priv) {
1320                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
1321                         "%s: memory allocation failure",
1322                         CTCM_FUNTAIL);
1323                 put_device(&cgdev->dev);
1324                 return -ENOMEM;
1325         }
1326
1327         rc = ctcm_add_files(&cgdev->dev);
1328         if (rc) {
1329                 kfree(priv);
1330                 put_device(&cgdev->dev);
1331                 return rc;
1332         }
1333         priv->buffer_size = CTCM_BUFSIZE_DEFAULT;
1334         cgdev->cdev[0]->handler = ctcm_irq_handler;
1335         cgdev->cdev[1]->handler = ctcm_irq_handler;
1336         dev_set_drvdata(&cgdev->dev, priv);
1337
1338         return 0;
1339 }
1340
1341 /**
1342  * Add a new channel to the list of channels.
1343  * Keeps the channel list sorted.
1344  *
1345  *  cdev        The ccw_device to be added.
1346  *  type        The type class of the new channel.
1347  *  priv        Points to the private data of the ccwgroup_device.
1348  *
1349  * returns 0 on success, !0 on error.
1350  */
1351 static int add_channel(struct ccw_device *cdev, enum ctcm_channel_types type,
1352                                 struct ctcm_priv *priv)
1353 {
1354         struct channel **c = &channels;
1355         struct channel *ch;
1356         int ccw_num;
1357         int rc = 0;
1358
1359         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1360                 "%s(%s), type %d, proto %d",
1361                         __func__, dev_name(&cdev->dev), type, priv->protocol);
1362
1363         ch = kzalloc(sizeof(struct channel), GFP_KERNEL);
1364         if (ch == NULL)
1365                 return -ENOMEM;
1366
1367         ch->protocol = priv->protocol;
1368         if (IS_MPC(priv)) {
1369                 ch->discontact_th = kzalloc(TH_HEADER_LENGTH, gfp_type());
1370                 if (ch->discontact_th == NULL)
1371                                         goto nomem_return;
1372
1373                 ch->discontact_th->th_blk_flag = TH_DISCONTACT;
1374                 tasklet_init(&ch->ch_disc_tasklet,
1375                         mpc_action_send_discontact, (unsigned long)ch);
1376
1377                 tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch);
1378                 ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35);
1379                 ccw_num = 17;
1380         } else
1381                 ccw_num = 8;
1382
1383         ch->ccw = kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA);
1384         if (ch->ccw == NULL)
1385                                         goto nomem_return;
1386
1387         ch->cdev = cdev;
1388         snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev));
1389         ch->type = type;
1390
1391         /**
1392          * "static" ccws are used in the following way:
1393          *
1394          * ccw[0..2] (Channel program for generic I/O):
1395          *           0: prepare
1396          *           1: read or write (depending on direction) with fixed
1397          *              buffer (idal allocated once when buffer is allocated)
1398          *           2: nop
1399          * ccw[3..5] (Channel program for direct write of packets)
1400          *           3: prepare
1401          *           4: write (idal allocated on every write).
1402          *           5: nop
1403          * ccw[6..7] (Channel program for initial channel setup):
1404          *           6: set extended mode
1405          *           7: nop
1406          *
1407          * ch->ccw[0..5] are initialized in ch_action_start because
1408          * the channel's direction is yet unknown here.
1409          *
1410          * ccws used for xid2 negotiations
1411          *  ch-ccw[8-14] need to be used for the XID exchange either
1412          *    X side XID2 Processing
1413          *       8:  write control
1414          *       9:  write th
1415          *           10: write XID
1416          *           11: read th from secondary
1417          *           12: read XID   from secondary
1418          *           13: read 4 byte ID
1419          *           14: nop
1420          *    Y side XID Processing
1421          *           8:  sense
1422          *       9:  read th
1423          *           10: read XID
1424          *           11: write th
1425          *           12: write XID
1426          *           13: write 4 byte ID
1427          *           14: nop
1428          *
1429          *  ccws used for double noop due to VM timing issues
1430          *  which result in unrecoverable Busy on channel
1431          *       15: nop
1432          *       16: nop
1433          */
1434         ch->ccw[6].cmd_code     = CCW_CMD_SET_EXTENDED;
1435         ch->ccw[6].flags        = CCW_FLAG_SLI;
1436
1437         ch->ccw[7].cmd_code     = CCW_CMD_NOOP;
1438         ch->ccw[7].flags        = CCW_FLAG_SLI;
1439
1440         if (IS_MPC(priv)) {
1441                 ch->ccw[15].cmd_code = CCW_CMD_WRITE;
1442                 ch->ccw[15].flags    = CCW_FLAG_SLI | CCW_FLAG_CC;
1443                 ch->ccw[15].count    = TH_HEADER_LENGTH;
1444                 ch->ccw[15].cda      = virt_to_phys(ch->discontact_th);
1445
1446                 ch->ccw[16].cmd_code = CCW_CMD_NOOP;
1447                 ch->ccw[16].flags    = CCW_FLAG_SLI;
1448
1449                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1450                                 ctc_ch_event_names, CTC_MPC_NR_STATES,
1451                                 CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm,
1452                                 mpc_ch_fsm_len, GFP_KERNEL);
1453         } else {
1454                 ch->fsm = init_fsm(ch->id, ctc_ch_state_names,
1455                                 ctc_ch_event_names, CTC_NR_STATES,
1456                                 CTC_NR_EVENTS, ch_fsm,
1457                                 ch_fsm_len, GFP_KERNEL);
1458         }
1459         if (ch->fsm == NULL)
1460                                 goto free_return;
1461
1462         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
1463
1464         ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL);
1465         if (ch->irb == NULL)
1466                                 goto nomem_return;
1467
1468         while (*c && ctcm_less_than((*c)->id, ch->id))
1469                 c = &(*c)->next;
1470
1471         if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) {
1472                 CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1473                                 "%s (%s) already in list, using old entry",
1474                                 __func__, (*c)->id);
1475
1476                                 goto free_return;
1477         }
1478
1479         spin_lock_init(&ch->collect_lock);
1480
1481         fsm_settimer(ch->fsm, &ch->timer);
1482         skb_queue_head_init(&ch->io_queue);
1483         skb_queue_head_init(&ch->collect_queue);
1484
1485         if (IS_MPC(priv)) {
1486                 fsm_settimer(ch->fsm, &ch->sweep_timer);
1487                 skb_queue_head_init(&ch->sweep_queue);
1488         }
1489         ch->next = *c;
1490         *c = ch;
1491         return 0;
1492
1493 nomem_return:
1494         rc = -ENOMEM;
1495
1496 free_return:    /* note that all channel pointers are 0 or valid */
1497         kfree(ch->ccw);
1498         kfree(ch->discontact_th);
1499         kfree_fsm(ch->fsm);
1500         kfree(ch->irb);
1501         kfree(ch);
1502         return rc;
1503 }
1504
1505 /*
1506  * Return type of a detected device.
1507  */
1508 static enum ctcm_channel_types get_channel_type(struct ccw_device_id *id)
1509 {
1510         enum ctcm_channel_types type;
1511         type = (enum ctcm_channel_types)id->driver_info;
1512
1513         if (type == ctcm_channel_type_ficon)
1514                 type = ctcm_channel_type_escon;
1515
1516         return type;
1517 }
1518
1519 /**
1520  *
1521  * Setup an interface.
1522  *
1523  *  cgdev       Device to be setup.
1524  *
1525  * returns 0 on success, !0 on failure.
1526  */
1527 static int ctcm_new_device(struct ccwgroup_device *cgdev)
1528 {
1529         char read_id[CTCM_ID_SIZE];
1530         char write_id[CTCM_ID_SIZE];
1531         int direction;
1532         enum ctcm_channel_types type;
1533         struct ctcm_priv *priv;
1534         struct net_device *dev;
1535         struct ccw_device *cdev0;
1536         struct ccw_device *cdev1;
1537         struct channel *readc;
1538         struct channel *writec;
1539         int ret;
1540         int result;
1541
1542         priv = dev_get_drvdata(&cgdev->dev);
1543         if (!priv) {
1544                 result = -ENODEV;
1545                 goto out_err_result;
1546         }
1547
1548         cdev0 = cgdev->cdev[0];
1549         cdev1 = cgdev->cdev[1];
1550
1551         type = get_channel_type(&cdev0->id);
1552
1553         snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev));
1554         snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev));
1555
1556         ret = add_channel(cdev0, type, priv);
1557         if (ret) {
1558                 result = ret;
1559                 goto out_err_result;
1560         }
1561         ret = add_channel(cdev1, type, priv);
1562         if (ret) {
1563                 result = ret;
1564                 goto out_remove_channel1;
1565         }
1566
1567         ret = ccw_device_set_online(cdev0);
1568         if (ret != 0) {
1569                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1570                         "%s(%s) set_online rc=%d",
1571                                 CTCM_FUNTAIL, read_id, ret);
1572                 result = -EIO;
1573                 goto out_remove_channel2;
1574         }
1575
1576         ret = ccw_device_set_online(cdev1);
1577         if (ret != 0) {
1578                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE,
1579                         "%s(%s) set_online rc=%d",
1580                                 CTCM_FUNTAIL, write_id, ret);
1581
1582                 result = -EIO;
1583                 goto out_ccw1;
1584         }
1585
1586         dev = ctcm_init_netdevice(priv);
1587         if (dev == NULL) {
1588                 result = -ENODEV;
1589                 goto out_ccw2;
1590         }
1591
1592         for (direction = CTCM_READ; direction <= CTCM_WRITE; direction++) {
1593                 priv->channel[direction] =
1594                         channel_get(type, direction == CTCM_READ ?
1595                                 read_id : write_id, direction);
1596                 if (priv->channel[direction] == NULL) {
1597                         if (direction == CTCM_WRITE)
1598                                 channel_free(priv->channel[CTCM_READ]);
1599                         goto out_dev;
1600                 }
1601                 priv->channel[direction]->netdev = dev;
1602                 priv->channel[direction]->protocol = priv->protocol;
1603                 priv->channel[direction]->max_bufsize = priv->buffer_size;
1604         }
1605         /* sysfs magic */
1606         SET_NETDEV_DEV(dev, &cgdev->dev);
1607
1608         if (register_netdev(dev)) {
1609                 result = -ENODEV;
1610                 goto out_dev;
1611         }
1612
1613         if (ctcm_add_attributes(&cgdev->dev)) {
1614                 result = -ENODEV;
1615                 goto out_unregister;
1616         }
1617
1618         strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name));
1619
1620         dev_info(&dev->dev,
1621                 "setup OK : r/w = %s/%s, protocol : %d\n",
1622                         priv->channel[CTCM_READ]->id,
1623                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1624
1625         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1626                 "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name,
1627                         priv->channel[CTCM_READ]->id,
1628                         priv->channel[CTCM_WRITE]->id, priv->protocol);
1629
1630         return 0;
1631 out_unregister:
1632         unregister_netdev(dev);
1633 out_dev:
1634         ctcm_free_netdevice(dev);
1635 out_ccw2:
1636         ccw_device_set_offline(cgdev->cdev[1]);
1637 out_ccw1:
1638         ccw_device_set_offline(cgdev->cdev[0]);
1639 out_remove_channel2:
1640         readc = channel_get(type, read_id, CTCM_READ);
1641         channel_remove(readc);
1642 out_remove_channel1:
1643         writec = channel_get(type, write_id, CTCM_WRITE);
1644         channel_remove(writec);
1645 out_err_result:
1646         return result;
1647 }
1648
1649 /**
1650  * Shutdown an interface.
1651  *
1652  *  cgdev       Device to be shut down.
1653  *
1654  * returns 0 on success, !0 on failure.
1655  */
1656 static int ctcm_shutdown_device(struct ccwgroup_device *cgdev)
1657 {
1658         struct ctcm_priv *priv;
1659         struct net_device *dev;
1660
1661         priv = dev_get_drvdata(&cgdev->dev);
1662         if (!priv)
1663                 return -ENODEV;
1664
1665         if (priv->channel[CTCM_READ]) {
1666                 dev = priv->channel[CTCM_READ]->netdev;
1667                 CTCM_DBF_DEV(SETUP, dev, "");
1668                 /* Close the device */
1669                 ctcm_close(dev);
1670                 dev->flags &= ~IFF_RUNNING;
1671                 ctcm_remove_attributes(&cgdev->dev);
1672                 channel_free(priv->channel[CTCM_READ]);
1673         } else
1674                 dev = NULL;
1675
1676         if (priv->channel[CTCM_WRITE])
1677                 channel_free(priv->channel[CTCM_WRITE]);
1678
1679         if (dev) {
1680                 unregister_netdev(dev);
1681                 ctcm_free_netdevice(dev);
1682         }
1683
1684         if (priv->fsm)
1685                 kfree_fsm(priv->fsm);
1686
1687         ccw_device_set_offline(cgdev->cdev[1]);
1688         ccw_device_set_offline(cgdev->cdev[0]);
1689
1690         if (priv->channel[CTCM_READ])
1691                 channel_remove(priv->channel[CTCM_READ]);
1692         if (priv->channel[CTCM_WRITE])
1693                 channel_remove(priv->channel[CTCM_WRITE]);
1694         priv->channel[CTCM_READ] = priv->channel[CTCM_WRITE] = NULL;
1695
1696         return 0;
1697
1698 }
1699
1700
1701 static void ctcm_remove_device(struct ccwgroup_device *cgdev)
1702 {
1703         struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev);
1704
1705         BUG_ON(priv == NULL);
1706
1707         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1708                         "removing device %p, proto : %d",
1709                         cgdev, priv->protocol);
1710
1711         if (cgdev->state == CCWGROUP_ONLINE)
1712                 ctcm_shutdown_device(cgdev);
1713         ctcm_remove_files(&cgdev->dev);
1714         dev_set_drvdata(&cgdev->dev, NULL);
1715         kfree(priv);
1716         put_device(&cgdev->dev);
1717 }
1718
1719 static int ctcm_pm_suspend(struct ccwgroup_device *gdev)
1720 {
1721         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1722
1723         if (gdev->state == CCWGROUP_OFFLINE)
1724                 return 0;
1725         netif_device_detach(priv->channel[CTCM_READ]->netdev);
1726         ctcm_close(priv->channel[CTCM_READ]->netdev);
1727         if (!wait_event_timeout(priv->fsm->wait_q,
1728             fsm_getstate(priv->fsm) == DEV_STATE_STOPPED, CTCM_TIME_5_SEC)) {
1729                 netif_device_attach(priv->channel[CTCM_READ]->netdev);
1730                 return -EBUSY;
1731         }
1732         ccw_device_set_offline(gdev->cdev[1]);
1733         ccw_device_set_offline(gdev->cdev[0]);
1734         return 0;
1735 }
1736
1737 static int ctcm_pm_resume(struct ccwgroup_device *gdev)
1738 {
1739         struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev);
1740         int rc;
1741
1742         if (gdev->state == CCWGROUP_OFFLINE)
1743                 return 0;
1744         rc = ccw_device_set_online(gdev->cdev[1]);
1745         if (rc)
1746                 goto err_out;
1747         rc = ccw_device_set_online(gdev->cdev[0]);
1748         if (rc)
1749                 goto err_out;
1750         ctcm_open(priv->channel[CTCM_READ]->netdev);
1751 err_out:
1752         netif_device_attach(priv->channel[CTCM_READ]->netdev);
1753         return rc;
1754 }
1755
1756 static struct ccw_device_id ctcm_ids[] = {
1757         {CCW_DEVICE(0x3088, 0x08), .driver_info = ctcm_channel_type_parallel},
1758         {CCW_DEVICE(0x3088, 0x1e), .driver_info = ctcm_channel_type_ficon},
1759         {CCW_DEVICE(0x3088, 0x1f), .driver_info = ctcm_channel_type_escon},
1760         {},
1761 };
1762 MODULE_DEVICE_TABLE(ccw, ctcm_ids);
1763
1764 static struct ccw_driver ctcm_ccw_driver = {
1765         .owner  = THIS_MODULE,
1766         .name   = "ctcm",
1767         .ids    = ctcm_ids,
1768         .probe  = ccwgroup_probe_ccwdev,
1769         .remove = ccwgroup_remove_ccwdev,
1770 };
1771
1772 static struct ccwgroup_driver ctcm_group_driver = {
1773         .owner       = THIS_MODULE,
1774         .name        = CTC_DRIVER_NAME,
1775         .max_slaves  = 2,
1776         .driver_id   = 0xC3E3C3D4,      /* CTCM */
1777         .probe       = ctcm_probe_device,
1778         .remove      = ctcm_remove_device,
1779         .set_online  = ctcm_new_device,
1780         .set_offline = ctcm_shutdown_device,
1781         .freeze      = ctcm_pm_suspend,
1782         .thaw        = ctcm_pm_resume,
1783         .restore     = ctcm_pm_resume,
1784 };
1785
1786 static ssize_t
1787 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1788                         size_t count)
1789 {
1790         int err;
1791
1792         err = ccwgroup_create_from_string(ctcm_root_dev,
1793                                           ctcm_group_driver.driver_id,
1794                                           &ctcm_ccw_driver, 2, buf);
1795         return err ? err : count;
1796 }
1797
1798 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1799
1800 static struct attribute *ctcm_group_attrs[] = {
1801         &driver_attr_group.attr,
1802         NULL,
1803 };
1804
1805 static struct attribute_group ctcm_group_attr_group = {
1806         .attrs = ctcm_group_attrs,
1807 };
1808
1809 static const struct attribute_group *ctcm_group_attr_groups[] = {
1810         &ctcm_group_attr_group,
1811         NULL,
1812 };
1813
1814 /*
1815  * Module related routines
1816  */
1817
1818 /*
1819  * Prepare to be unloaded. Free IRQ's and release all resources.
1820  * This is called just before this module is unloaded. It is
1821  * not called, if the usage count is !0, so we don't need to check
1822  * for that.
1823  */
1824 static void __exit ctcm_exit(void)
1825 {
1826         driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1827         ccwgroup_driver_unregister(&ctcm_group_driver);
1828         ccw_driver_unregister(&ctcm_ccw_driver);
1829         root_device_unregister(ctcm_root_dev);
1830         ctcm_unregister_dbf_views();
1831         pr_info("CTCM driver unloaded\n");
1832 }
1833
1834 /*
1835  * Print Banner.
1836  */
1837 static void print_banner(void)
1838 {
1839         pr_info("CTCM driver initialized\n");
1840 }
1841
1842 /**
1843  * Initialize module.
1844  * This is called just after the module is loaded.
1845  *
1846  * returns 0 on success, !0 on error.
1847  */
1848 static int __init ctcm_init(void)
1849 {
1850         int ret;
1851
1852         channels = NULL;
1853
1854         ret = ctcm_register_dbf_views();
1855         if (ret)
1856                 goto out_err;
1857         ctcm_root_dev = root_device_register("ctcm");
1858         ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1859         if (ret)
1860                 goto register_err;
1861         ret = ccw_driver_register(&ctcm_ccw_driver);
1862         if (ret)
1863                 goto ccw_err;
1864         ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1865         ret = ccwgroup_driver_register(&ctcm_group_driver);
1866         if (ret)
1867                 goto ccwgroup_err;
1868         print_banner();
1869         return 0;
1870
1871 ccwgroup_err:
1872         ccw_driver_unregister(&ctcm_ccw_driver);
1873 ccw_err:
1874         root_device_unregister(ctcm_root_dev);
1875 register_err:
1876         ctcm_unregister_dbf_views();
1877 out_err:
1878         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1879                 __func__, ret);
1880         return ret;
1881 }
1882
1883 module_init(ctcm_init);
1884 module_exit(ctcm_exit);
1885
1886 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1887 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1888 MODULE_LICENSE("GPL");
1889