qeth: do vlan cleanup
[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/kernel_stat.h>
28 #include <linux/module.h>
29 #include <linux/init.h>
30 #include <linux/kernel.h>
31 #include <linux/slab.h>
32 #include <linux/errno.h>
33 #include <linux/types.h>
34 #include <linux/interrupt.h>
35 #include <linux/timer.h>
36 #include <linux/bitops.h>
37
38 #include <linux/signal.h>
39 #include <linux/string.h>
40
41 #include <linux/ip.h>
42 #include <linux/if_arp.h>
43 #include <linux/tcp.h>
44 #include <linux/skbuff.h>
45 #include <linux/ctype.h>
46 #include <net/dst.h>
47
48 #include <linux/io.h>
49 #include <asm/ccwdev.h>
50 #include <asm/ccwgroup.h>
51 #include <linux/uaccess.h>
52
53 #include <asm/idals.h>
54
55 #include "ctcm_fsms.h"
56 #include "ctcm_main.h"
57
58 /* Some common global variables */
59
60 /**
61  * The root device for ctcm group devices
62  */
63 static struct device *ctcm_root_dev;
64
65 /*
66  * Linked list of all detected channels.
67  */
68 struct channel *channels;
69
70 /**
71  * Unpack a just received skb and hand it over to
72  * upper layers.
73  *
74  *  ch          The channel where this skb has been received.
75  *  pskb        The received skb.
76  */
77 void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb)
78 {
79         struct net_device *dev = ch->netdev;
80         struct ctcm_priv *priv = dev->ml_priv;
81         __u16 len = *((__u16 *) pskb->data);
82
83         skb_put(pskb, 2 + LL_HEADER_LENGTH);
84         skb_pull(pskb, 2);
85         pskb->dev = dev;
86         pskb->ip_summed = CHECKSUM_UNNECESSARY;
87         while (len > 0) {
88                 struct sk_buff *skb;
89                 int skblen;
90                 struct ll_header *header = (struct ll_header *)pskb->data;
91
92                 skb_pull(pskb, LL_HEADER_LENGTH);
93                 if ((ch->protocol == CTCM_PROTO_S390) &&
94                     (header->type != ETH_P_IP)) {
95                         if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) {
96                                 ch->logflags |= LOG_FLAG_ILLEGALPKT;
97                                 /*
98                                  * Check packet type only if we stick strictly
99                                  * to S/390's protocol of OS390. This only
100                                  * supports IP. Otherwise allow any packet
101                                  * type.
102                                  */
103                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
104                                         "%s(%s): Illegal packet type 0x%04x"
105                                         " - dropping",
106                                         CTCM_FUNTAIL, dev->name, header->type);
107                         }
108                         priv->stats.rx_dropped++;
109                         priv->stats.rx_frame_errors++;
110                         return;
111                 }
112                 pskb->protocol = ntohs(header->type);
113                 if ((header->length <= LL_HEADER_LENGTH) ||
114                     (len <= LL_HEADER_LENGTH)) {
115                         if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) {
116                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
117                                         "%s(%s): Illegal packet size %d(%d,%d)"
118                                         "- dropping",
119                                         CTCM_FUNTAIL, dev->name,
120                                         header->length, dev->mtu, len);
121                                 ch->logflags |= LOG_FLAG_ILLEGALSIZE;
122                         }
123
124                         priv->stats.rx_dropped++;
125                         priv->stats.rx_length_errors++;
126                         return;
127                 }
128                 header->length -= LL_HEADER_LENGTH;
129                 len -= LL_HEADER_LENGTH;
130                 if ((header->length > skb_tailroom(pskb)) ||
131                         (header->length > len)) {
132                         if (!(ch->logflags & LOG_FLAG_OVERRUN)) {
133                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
134                                         "%s(%s): Packet size %d (overrun)"
135                                         " - dropping", CTCM_FUNTAIL,
136                                                 dev->name, header->length);
137                                 ch->logflags |= LOG_FLAG_OVERRUN;
138                         }
139
140                         priv->stats.rx_dropped++;
141                         priv->stats.rx_length_errors++;
142                         return;
143                 }
144                 skb_put(pskb, header->length);
145                 skb_reset_mac_header(pskb);
146                 len -= header->length;
147                 skb = dev_alloc_skb(pskb->len);
148                 if (!skb) {
149                         if (!(ch->logflags & LOG_FLAG_NOMEM)) {
150                                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
151                                         "%s(%s): MEMORY allocation error",
152                                                 CTCM_FUNTAIL, dev->name);
153                                 ch->logflags |= LOG_FLAG_NOMEM;
154                         }
155                         priv->stats.rx_dropped++;
156                         return;
157                 }
158                 skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len),
159                                           pskb->len);
160                 skb_reset_mac_header(skb);
161                 skb->dev = pskb->dev;
162                 skb->protocol = pskb->protocol;
163                 pskb->ip_summed = CHECKSUM_UNNECESSARY;
164                 skblen = skb->len;
165                 /*
166                  * reset logflags
167                  */
168                 ch->logflags = 0;
169                 priv->stats.rx_packets++;
170                 priv->stats.rx_bytes += skblen;
171                 netif_rx_ni(skb);
172                 if (len > 0) {
173                         skb_pull(pskb, header->length);
174                         if (skb_tailroom(pskb) < LL_HEADER_LENGTH) {
175                                 CTCM_DBF_DEV_NAME(TRACE, dev,
176                                         "Overrun in ctcm_unpack_skb");
177                                 ch->logflags |= LOG_FLAG_OVERRUN;
178                                 return;
179                         }
180                         skb_put(pskb, LL_HEADER_LENGTH);
181                 }
182         }
183 }
184
185 /**
186  * Release a specific channel in the channel list.
187  *
188  *  ch          Pointer to channel struct to be released.
189  */
190 static void channel_free(struct channel *ch)
191 {
192         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id);
193         ch->flags &= ~CHANNEL_FLAGS_INUSE;
194         fsm_newstate(ch->fsm, CTC_STATE_IDLE);
195 }
196
197 /**
198  * Remove a specific channel in the channel list.
199  *
200  *  ch          Pointer to channel struct to be released.
201  */
202 static void channel_remove(struct channel *ch)
203 {
204         struct channel **c = &channels;
205         char chid[CTCM_ID_SIZE+1];
206         int ok = 0;
207
208         if (ch == NULL)
209                 return;
210         else
211                 strncpy(chid, ch->id, CTCM_ID_SIZE);
212
213         channel_free(ch);
214         while (*c) {
215                 if (*c == ch) {
216                         *c = ch->next;
217                         fsm_deltimer(&ch->timer);
218                         if (IS_MPC(ch))
219                                 fsm_deltimer(&ch->sweep_timer);
220
221                         kfree_fsm(ch->fsm);
222                         clear_normalized_cda(&ch->ccw[4]);
223                         if (ch->trans_skb != NULL) {
224                                 clear_normalized_cda(&ch->ccw[1]);
225                                 dev_kfree_skb_any(ch->trans_skb);
226                         }
227                         if (IS_MPC(ch)) {
228                                 tasklet_kill(&ch->ch_tasklet);
229                                 tasklet_kill(&ch->ch_disc_tasklet);
230                                 kfree(ch->discontact_th);
231                         }
232                         kfree(ch->ccw);
233                         kfree(ch->irb);
234                         kfree(ch);
235                         ok = 1;
236                         break;
237                 }
238                 c = &((*c)->next);
239         }
240
241         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL,
242                         chid, ok ? "OK" : "failed");
243 }
244
245 /**
246  * Get a specific channel from the channel list.
247  *
248  *  type        Type of channel we are interested in.
249  *  id          Id of channel we are interested in.
250  *  direction   Direction we want to use this channel for.
251  *
252  * returns Pointer to a channel or NULL if no matching channel available.
253  */
254 static struct channel *channel_get(enum ctcm_channel_types type,
255                                         char *id, int direction)
256 {
257         struct channel *ch = channels;
258
259         while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type)))
260                 ch = ch->next;
261         if (!ch) {
262                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
263                                 "%s(%d, %s, %d) not found in channel list\n",
264                                 CTCM_FUNTAIL, type, id, direction);
265         } else {
266                 if (ch->flags & CHANNEL_FLAGS_INUSE)
267                         ch = NULL;
268                 else {
269                         ch->flags |= CHANNEL_FLAGS_INUSE;
270                         ch->flags &= ~CHANNEL_FLAGS_RWMASK;
271                         ch->flags |= (direction == CTCM_WRITE)
272                             ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ;
273                         fsm_newstate(ch->fsm, CTC_STATE_STOPPED);
274                 }
275         }
276         return ch;
277 }
278
279 static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb)
280 {
281         if (!IS_ERR(irb))
282                 return 0;
283
284         CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN,
285                         "irb error %ld on device %s\n",
286                                 PTR_ERR(irb), dev_name(&cdev->dev));
287
288         switch (PTR_ERR(irb)) {
289         case -EIO:
290                 dev_err(&cdev->dev,
291                         "An I/O-error occurred on the CTCM device\n");
292                 break;
293         case -ETIMEDOUT:
294                 dev_err(&cdev->dev,
295                         "An adapter hardware operation timed out\n");
296                 break;
297         default:
298                 dev_err(&cdev->dev,
299                         "An error occurred on the adapter hardware\n");
300         }
301         return PTR_ERR(irb);
302 }
303
304
305 /**
306  * Check sense of a unit check.
307  *
308  *  ch          The channel, the sense code belongs to.
309  *  sense       The sense code to inspect.
310  */
311 static inline void ccw_unit_check(struct channel *ch, __u8 sense)
312 {
313         CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG,
314                         "%s(%s): %02x",
315                                 CTCM_FUNTAIL, ch->id, sense);
316
317         if (sense & SNS0_INTERVENTION_REQ) {
318                 if (sense & 0x01) {
319                         if (ch->sense_rc != 0x01) {
320                                 pr_notice(
321                                         "%s: The communication peer has "
322                                         "disconnected\n", ch->id);
323                                 ch->sense_rc = 0x01;
324                         }
325                         fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch);
326                 } else {
327                         if (ch->sense_rc != SNS0_INTERVENTION_REQ) {
328                                 pr_notice(
329                                         "%s: The remote operating system is "
330                                         "not available\n", ch->id);
331                                 ch->sense_rc = SNS0_INTERVENTION_REQ;
332                         }
333                         fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch);
334                 }
335         } else if (sense & SNS0_EQUIPMENT_CHECK) {
336                 if (sense & SNS0_BUS_OUT_CHECK) {
337                         if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
338                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
339                                         "%s(%s): remote HW error %02x",
340                                                 CTCM_FUNTAIL, ch->id, sense);
341                                 ch->sense_rc = SNS0_BUS_OUT_CHECK;
342                         }
343                         fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch);
344                 } else {
345                         if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) {
346                                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
347                                         "%s(%s): remote read parity error %02x",
348                                                 CTCM_FUNTAIL, ch->id, sense);
349                                 ch->sense_rc = SNS0_EQUIPMENT_CHECK;
350                         }
351                         fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch);
352                 }
353         } else if (sense & SNS0_BUS_OUT_CHECK) {
354                 if (ch->sense_rc != SNS0_BUS_OUT_CHECK) {
355                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
356                                 "%s(%s): BUS OUT error %02x",
357                                         CTCM_FUNTAIL, ch->id, sense);
358                         ch->sense_rc = SNS0_BUS_OUT_CHECK;
359                 }
360                 if (sense & 0x04)       /* data-streaming timeout */
361                         fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch);
362                 else                    /* Data-transfer parity error */
363                         fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch);
364         } else if (sense & SNS0_CMD_REJECT) {
365                 if (ch->sense_rc != SNS0_CMD_REJECT) {
366                         CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
367                                 "%s(%s): Command rejected",
368                                                 CTCM_FUNTAIL, ch->id);
369                         ch->sense_rc = SNS0_CMD_REJECT;
370                 }
371         } else if (sense == 0) {
372                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
373                         "%s(%s): Unit check ZERO",
374                                         CTCM_FUNTAIL, ch->id);
375                 fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch);
376         } else {
377                 CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN,
378                         "%s(%s): Unit check code %02x unknown",
379                                         CTCM_FUNTAIL, ch->id, sense);
380                 fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch);
381         }
382 }
383
384 int ctcm_ch_alloc_buffer(struct channel *ch)
385 {
386         clear_normalized_cda(&ch->ccw[1]);
387         ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA);
388         if (ch->trans_skb == NULL) {
389                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
390                         "%s(%s): %s trans_skb allocation error",
391                         CTCM_FUNTAIL, ch->id,
392                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
393                                 "RX" : "TX");
394                 return -ENOMEM;
395         }
396
397         ch->ccw[1].count = ch->max_bufsize;
398         if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) {
399                 dev_kfree_skb(ch->trans_skb);
400                 ch->trans_skb = NULL;
401                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
402                         "%s(%s): %s set norm_cda failed",
403                         CTCM_FUNTAIL, ch->id,
404                         (CHANNEL_DIRECTION(ch->flags) == CTCM_READ) ?
405                                 "RX" : "TX");
406                 return -ENOMEM;
407         }
408
409         ch->ccw[1].count = 0;
410         ch->trans_skb_data = ch->trans_skb->data;
411         ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED;
412         return 0;
413 }
414
415 /*
416  * Interface API for upper network layers
417  */
418
419 /**
420  * Open an interface.
421  * Called from generic network layer when ifconfig up is run.
422  *
423  *  dev         Pointer to interface struct.
424  *
425  * returns 0 on success, -ERRNO on failure. (Never fails.)
426  */
427 int ctcm_open(struct net_device *dev)
428 {
429         struct ctcm_priv *priv = dev->ml_priv;
430
431         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
432         if (!IS_MPC(priv))
433                 fsm_event(priv->fsm,    DEV_EVENT_START, dev);
434         return 0;
435 }
436
437 /**
438  * Close an interface.
439  * Called from generic network layer when ifconfig down is run.
440  *
441  *  dev         Pointer to interface struct.
442  *
443  * returns 0 on success, -ERRNO on failure. (Never fails.)
444  */
445 int ctcm_close(struct net_device *dev)
446 {
447         struct ctcm_priv *priv = dev->ml_priv;
448
449         CTCMY_DBF_DEV_NAME(SETUP, dev, "");
450         if (!IS_MPC(priv))
451                 fsm_event(priv->fsm, DEV_EVENT_STOP, dev);
452         return 0;
453 }
454
455
456 /**
457  * Transmit a packet.
458  * This is a helper function for ctcm_tx().
459  *
460  *  ch          Channel to be used for sending.
461  *  skb         Pointer to struct sk_buff of packet to send.
462  *            The linklevel header has already been set up
463  *            by ctcm_tx().
464  *
465  * returns 0 on success, -ERRNO on failure. (Never fails.)
466  */
467 static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb)
468 {
469         unsigned long saveflags;
470         struct ll_header header;
471         int rc = 0;
472         __u16 block_len;
473         int ccw_idx;
474         struct sk_buff *nskb;
475         unsigned long hi;
476
477         /* we need to acquire the lock for testing the state
478          * otherwise we can have an IRQ changing the state to
479          * TXIDLE after the test but before acquiring the lock.
480          */
481         spin_lock_irqsave(&ch->collect_lock, saveflags);
482         if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) {
483                 int l = skb->len + LL_HEADER_LENGTH;
484
485                 if (ch->collect_len + l > ch->max_bufsize - 2) {
486                         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
487                         return -EBUSY;
488                 } else {
489                         atomic_inc(&skb->users);
490                         header.length = l;
491                         header.type = skb->protocol;
492                         header.unused = 0;
493                         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header,
494                                LL_HEADER_LENGTH);
495                         skb_queue_tail(&ch->collect_queue, skb);
496                         ch->collect_len += l;
497                 }
498                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
499                                 goto done;
500         }
501         spin_unlock_irqrestore(&ch->collect_lock, saveflags);
502         /*
503          * Protect skb against beeing free'd by upper
504          * layers.
505          */
506         atomic_inc(&skb->users);
507         ch->prof.txlen += skb->len;
508         header.length = skb->len + LL_HEADER_LENGTH;
509         header.type = skb->protocol;
510         header.unused = 0;
511         memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH);
512         block_len = skb->len + 2;
513         *((__u16 *)skb_push(skb, 2)) = block_len;
514
515         /*
516          * IDAL support in CTCM is broken, so we have to
517          * care about skb's above 2G ourselves.
518          */
519         hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31;
520         if (hi) {
521                 nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
522                 if (!nskb) {
523                         atomic_dec(&skb->users);
524                         skb_pull(skb, LL_HEADER_LENGTH + 2);
525                         ctcm_clear_busy(ch->netdev);
526                         return -ENOMEM;
527                 } else {
528                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
529                         atomic_inc(&nskb->users);
530                         atomic_dec(&skb->users);
531                         dev_kfree_skb_irq(skb);
532                         skb = nskb;
533                 }
534         }
535
536         ch->ccw[4].count = block_len;
537         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
538                 /*
539                  * idal allocation failed, try via copying to
540                  * trans_skb. trans_skb usually has a pre-allocated
541                  * idal.
542                  */
543                 if (ctcm_checkalloc_buffer(ch)) {
544                         /*
545                          * Remove our header. It gets added
546                          * again on retransmit.
547                          */
548                         atomic_dec(&skb->users);
549                         skb_pull(skb, LL_HEADER_LENGTH + 2);
550                         ctcm_clear_busy(ch->netdev);
551                         return -ENOMEM;
552                 }
553
554                 skb_reset_tail_pointer(ch->trans_skb);
555                 ch->trans_skb->len = 0;
556                 ch->ccw[1].count = skb->len;
557                 skb_copy_from_linear_data(skb,
558                                 skb_put(ch->trans_skb, skb->len), skb->len);
559                 atomic_dec(&skb->users);
560                 dev_kfree_skb_irq(skb);
561                 ccw_idx = 0;
562         } else {
563                 skb_queue_tail(&ch->io_queue, skb);
564                 ccw_idx = 3;
565         }
566         ch->retry = 0;
567         fsm_newstate(ch->fsm, CTC_STATE_TX);
568         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
569         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
570         ch->prof.send_stamp = current_kernel_time(); /* xtime */
571         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
572                                         (unsigned long)ch, 0xff, 0);
573         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
574         if (ccw_idx == 3)
575                 ch->prof.doios_single++;
576         if (rc != 0) {
577                 fsm_deltimer(&ch->timer);
578                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
579                 if (ccw_idx == 3)
580                         skb_dequeue_tail(&ch->io_queue);
581                 /*
582                  * Remove our header. It gets added
583                  * again on retransmit.
584                  */
585                 skb_pull(skb, LL_HEADER_LENGTH + 2);
586         } else if (ccw_idx == 0) {
587                 struct net_device *dev = ch->netdev;
588                 struct ctcm_priv *priv = dev->ml_priv;
589                 priv->stats.tx_packets++;
590                 priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH;
591         }
592 done:
593         ctcm_clear_busy(ch->netdev);
594         return rc;
595 }
596
597 static void ctcmpc_send_sweep_req(struct channel *rch)
598 {
599         struct net_device *dev = rch->netdev;
600         struct ctcm_priv *priv;
601         struct mpc_group *grp;
602         struct th_sweep *header;
603         struct sk_buff *sweep_skb;
604         struct channel *ch;
605         /* int rc = 0; */
606
607         priv = dev->ml_priv;
608         grp = priv->mpcg;
609         ch = priv->channel[CTCM_WRITE];
610
611         /* sweep processing is not complete until response and request */
612         /* has completed for all read channels in group                */
613         if (grp->in_sweep == 0) {
614                 grp->in_sweep = 1;
615                 grp->sweep_rsp_pend_num = grp->active_channels[CTCM_READ];
616                 grp->sweep_req_pend_num = grp->active_channels[CTCM_READ];
617         }
618
619         sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA);
620
621         if (sweep_skb == NULL)  {
622                 /* rc = -ENOMEM; */
623                                 goto nomem;
624         }
625
626         header = kmalloc(TH_SWEEP_LENGTH, gfp_type());
627
628         if (!header) {
629                 dev_kfree_skb_any(sweep_skb);
630                 /* rc = -ENOMEM; */
631                                 goto nomem;
632         }
633
634         header->th.th_seg       = 0x00 ;
635         header->th.th_ch_flag   = TH_SWEEP_REQ;  /* 0x0f */
636         header->th.th_blk_flag  = 0x00;
637         header->th.th_is_xid    = 0x00;
638         header->th.th_seq_num   = 0x00;
639         header->sw.th_last_seq  = ch->th_seq_num;
640
641         memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH);
642
643         kfree(header);
644
645         dev->trans_start = jiffies;
646         skb_queue_tail(&ch->sweep_queue, sweep_skb);
647
648         fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch);
649
650         return;
651
652 nomem:
653         grp->in_sweep = 0;
654         ctcm_clear_busy(dev);
655         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
656
657         return;
658 }
659
660 /*
661  * MPC mode version of transmit_skb
662  */
663 static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb)
664 {
665         struct pdu *p_header;
666         struct net_device *dev = ch->netdev;
667         struct ctcm_priv *priv = dev->ml_priv;
668         struct mpc_group *grp = priv->mpcg;
669         struct th_header *header;
670         struct sk_buff *nskb;
671         int rc = 0;
672         int ccw_idx;
673         unsigned long hi;
674         unsigned long saveflags = 0;    /* avoids compiler warning */
675
676         CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n",
677                         __func__, dev->name, smp_processor_id(), ch,
678                                         ch->id, fsm_getstate_str(ch->fsm));
679
680         if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) {
681                 spin_lock_irqsave(&ch->collect_lock, saveflags);
682                 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         /*
722          * IDAL support in CTCM is broken, so we have to
723          * care about skb's above 2G ourselves.
724          */
725         hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31;
726         if (hi) {
727                 nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA);
728                 if (!nskb) {
729                         goto nomem_exit;
730                 } else {
731                         memcpy(skb_put(nskb, skb->len), skb->data, skb->len);
732                         atomic_inc(&nskb->users);
733                         atomic_dec(&skb->users);
734                         dev_kfree_skb_irq(skb);
735                         skb = nskb;
736                 }
737         }
738
739         p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type());
740
741         if (!p_header)
742                 goto nomem_exit;
743
744         p_header->pdu_offset = skb->len;
745         p_header->pdu_proto = 0x01;
746         p_header->pdu_flag = 0x00;
747         p_header->pdu_seq = 0;
748         if (skb->protocol == ntohs(ETH_P_SNAP)) {
749                 p_header->pdu_flag |= PDU_FIRST | PDU_CNTL;
750         } else {
751                 p_header->pdu_flag |= PDU_FIRST;
752         }
753         memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH);
754
755         kfree(p_header);
756
757         if (ch->collect_len > 0) {
758                 spin_lock_irqsave(&ch->collect_lock, saveflags);
759                 skb_queue_tail(&ch->collect_queue, skb);
760                 ch->collect_len += skb->len;
761                 skb = skb_dequeue(&ch->collect_queue);
762                 ch->collect_len -= skb->len;
763                 spin_unlock_irqrestore(&ch->collect_lock, saveflags);
764         }
765
766         p_header = (struct pdu *)skb->data;
767         p_header->pdu_flag |= PDU_LAST;
768
769         ch->prof.txlen += skb->len - PDU_HEADER_LENGTH;
770
771         header = kmalloc(TH_HEADER_LENGTH, gfp_type());
772         if (!header)
773                 goto nomem_exit;
774
775         header->th_seg = 0x00;
776         header->th_ch_flag = TH_HAS_PDU;  /* Normal data */
777         header->th_blk_flag = 0x00;
778         header->th_is_xid = 0x00;          /* Just data here */
779         ch->th_seq_num++;
780         header->th_seq_num = ch->th_seq_num;
781
782         CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" ,
783                        __func__, dev->name, ch->th_seq_num);
784
785         /* put the TH on the packet */
786         memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH);
787
788         kfree(header);
789
790         CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for "
791                         "up to 32 bytes sent to vtam:\n",
792                                 __func__, dev->name, skb->len);
793         CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
794
795         ch->ccw[4].count = skb->len;
796         if (set_normalized_cda(&ch->ccw[4], skb->data)) {
797                 /*
798                  * idal allocation failed, try via copying to trans_skb.
799                  * trans_skb usually has a pre-allocated idal.
800                  */
801                 if (ctcm_checkalloc_buffer(ch)) {
802                         /*
803                          * Remove our header.
804                          * It gets added again on retransmit.
805                          */
806                                 goto nomem_exit;
807                 }
808
809                 skb_reset_tail_pointer(ch->trans_skb);
810                 ch->trans_skb->len = 0;
811                 ch->ccw[1].count = skb->len;
812                 memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len);
813                 atomic_dec(&skb->users);
814                 dev_kfree_skb_irq(skb);
815                 ccw_idx = 0;
816                 CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n"
817                                 "up to 32 bytes sent to vtam:\n",
818                                 __func__, dev->name, ch->trans_skb->len);
819                 CTCM_D3_DUMP((char *)ch->trans_skb->data,
820                                 min_t(int, 32, ch->trans_skb->len));
821         } else {
822                 skb_queue_tail(&ch->io_queue, skb);
823                 ccw_idx = 3;
824         }
825         ch->retry = 0;
826         fsm_newstate(ch->fsm, CTC_STATE_TX);
827         fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch);
828
829         if (do_debug_ccw)
830                 ctcmpc_dumpit((char *)&ch->ccw[ccw_idx],
831                                         sizeof(struct ccw1) * 3);
832
833         spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags);
834         ch->prof.send_stamp = current_kernel_time(); /* xtime */
835         rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx],
836                                         (unsigned long)ch, 0xff, 0);
837         spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags);
838         if (ccw_idx == 3)
839                 ch->prof.doios_single++;
840         if (rc != 0) {
841                 fsm_deltimer(&ch->timer);
842                 ctcm_ccw_check_rc(ch, rc, "single skb TX");
843                 if (ccw_idx == 3)
844                         skb_dequeue_tail(&ch->io_queue);
845         } else if (ccw_idx == 0) {
846                 priv->stats.tx_packets++;
847                 priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH;
848         }
849         if (ch->th_seq_num > 0xf0000000)        /* Chose at random. */
850                 ctcmpc_send_sweep_req(ch);
851
852         goto done;
853 nomem_exit:
854         CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT,
855                         "%s(%s): MEMORY allocation ERROR\n",
856                         CTCM_FUNTAIL, ch->id);
857         rc = -ENOMEM;
858         atomic_dec(&skb->users);
859         dev_kfree_skb_any(skb);
860         fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev);
861 done:
862         CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name);
863         return rc;
864 }
865
866 /**
867  * Start transmission of a packet.
868  * Called from generic network device layer.
869  *
870  *  skb         Pointer to buffer containing the packet.
871  *  dev         Pointer to interface struct.
872  *
873  * returns 0 if packet consumed, !0 if packet rejected.
874  *         Note: If we return !0, then the packet is free'd by
875  *               the generic network layer.
876  */
877 /* first merge version - leaving both functions separated */
878 static int ctcm_tx(struct sk_buff *skb, struct net_device *dev)
879 {
880         struct ctcm_priv *priv = dev->ml_priv;
881
882         if (skb == NULL) {
883                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
884                                 "%s(%s): NULL sk_buff passed",
885                                         CTCM_FUNTAIL, dev->name);
886                 priv->stats.tx_dropped++;
887                 return NETDEV_TX_OK;
888         }
889         if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) {
890                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR,
891                         "%s(%s): Got sk_buff with head room < %ld bytes",
892                         CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2);
893                 dev_kfree_skb(skb);
894                 priv->stats.tx_dropped++;
895                 return NETDEV_TX_OK;
896         }
897
898         /*
899          * If channels are not running, try to restart them
900          * and throw away packet.
901          */
902         if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) {
903                 fsm_event(priv->fsm, DEV_EVENT_START, dev);
904                 dev_kfree_skb(skb);
905                 priv->stats.tx_dropped++;
906                 priv->stats.tx_errors++;
907                 priv->stats.tx_carrier_errors++;
908                 return NETDEV_TX_OK;
909         }
910
911         if (ctcm_test_and_set_busy(dev))
912                 return NETDEV_TX_BUSY;
913
914         dev->trans_start = jiffies;
915         if (ctcm_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0)
916                 return NETDEV_TX_BUSY;
917         return NETDEV_TX_OK;
918 }
919
920 /* unmerged MPC variant of ctcm_tx */
921 static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev)
922 {
923         int len = 0;
924         struct ctcm_priv *priv = dev->ml_priv;
925         struct mpc_group *grp  = priv->mpcg;
926         struct sk_buff *newskb = NULL;
927
928         /*
929          * Some sanity checks ...
930          */
931         if (skb == NULL) {
932                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
933                         "%s(%s): NULL sk_buff passed",
934                                         CTCM_FUNTAIL, dev->name);
935                 priv->stats.tx_dropped++;
936                                         goto done;
937         }
938         if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) {
939                 CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
940                         "%s(%s): Got sk_buff with head room < %ld bytes",
941                         CTCM_FUNTAIL, dev->name,
942                                 TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
943
944                 CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len));
945
946                 len =  skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
947                 newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA);
948
949                 if (!newskb) {
950                         CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR,
951                                 "%s: %s: __dev_alloc_skb failed",
952                                                 __func__, dev->name);
953
954                         dev_kfree_skb_any(skb);
955                         priv->stats.tx_dropped++;
956                         priv->stats.tx_errors++;
957                         priv->stats.tx_carrier_errors++;
958                         fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
959                                         goto done;
960                 }
961                 newskb->protocol = skb->protocol;
962                 skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH);
963                 memcpy(skb_put(newskb, skb->len), skb->data, skb->len);
964                 dev_kfree_skb_any(skb);
965                 skb = newskb;
966         }
967
968         /*
969          * If channels are not running,
970          * notify anybody about a link failure and throw
971          * away packet.
972          */
973         if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) ||
974            (fsm_getstate(grp->fsm) <  MPCG_STATE_XID2INITW)) {
975                 dev_kfree_skb_any(skb);
976                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
977                         "%s(%s): inactive MPCGROUP - dropped",
978                                         CTCM_FUNTAIL, dev->name);
979                 priv->stats.tx_dropped++;
980                 priv->stats.tx_errors++;
981                 priv->stats.tx_carrier_errors++;
982                                         goto done;
983         }
984
985         if (ctcm_test_and_set_busy(dev)) {
986                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
987                         "%s(%s): device busy - dropped",
988                                         CTCM_FUNTAIL, dev->name);
989                 dev_kfree_skb_any(skb);
990                 priv->stats.tx_dropped++;
991                 priv->stats.tx_errors++;
992                 priv->stats.tx_carrier_errors++;
993                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
994                                         goto done;
995         }
996
997         dev->trans_start = jiffies;
998         if (ctcmpc_transmit_skb(priv->channel[CTCM_WRITE], skb) != 0) {
999                 CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR,
1000                         "%s(%s): device error - dropped",
1001                                         CTCM_FUNTAIL, dev->name);
1002                 dev_kfree_skb_any(skb);
1003                 priv->stats.tx_dropped++;
1004                 priv->stats.tx_errors++;
1005                 priv->stats.tx_carrier_errors++;
1006                 ctcm_clear_busy(dev);
1007                 fsm_event(grp->fsm, MPCG_EVENT_INOP, dev);
1008                                         goto done;
1009         }
1010         ctcm_clear_busy(dev);
1011 done:
1012         if (do_debug)
1013                 MPC_DBF_DEV_NAME(TRACE, dev, "exit");
1014
1015         return NETDEV_TX_OK;    /* handle freeing of skb here */
1016 }
1017
1018
1019 /**
1020  * Sets MTU of an interface.
1021  *
1022  *  dev         Pointer to interface struct.
1023  *  new_mtu     The new MTU to use for this interface.
1024  *
1025  * returns 0 on success, -EINVAL if MTU is out of valid range.
1026  *         (valid range is 576 .. 65527). If VM is on the
1027  *         remote side, maximum MTU is 32760, however this is
1028  *         not checked here.
1029  */
1030 static int ctcm_change_mtu(struct net_device *dev, int new_mtu)
1031 {
1032         struct ctcm_priv *priv;
1033         int max_bufsize;
1034
1035         if (new_mtu < 576 || new_mtu > 65527)
1036                 return -EINVAL;
1037
1038         priv = dev->ml_priv;
1039         max_bufsize = priv->channel[CTCM_READ]->max_bufsize;
1040
1041         if (IS_MPC(priv)) {
1042                 if (new_mtu > max_bufsize - TH_HEADER_LENGTH)
1043                         return -EINVAL;
1044                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1045         } else {
1046                 if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2)
1047                         return -EINVAL;
1048                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1049         }
1050         dev->mtu = new_mtu;
1051         return 0;
1052 }
1053
1054 /**
1055  * Returns interface statistics of a device.
1056  *
1057  *  dev         Pointer to interface struct.
1058  *
1059  * returns Pointer to stats struct of this interface.
1060  */
1061 static struct net_device_stats *ctcm_stats(struct net_device *dev)
1062 {
1063         return &((struct ctcm_priv *)dev->ml_priv)->stats;
1064 }
1065
1066 static void ctcm_free_netdevice(struct net_device *dev)
1067 {
1068         struct ctcm_priv *priv;
1069         struct mpc_group *grp;
1070
1071         CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO,
1072                         "%s(%s)", CTCM_FUNTAIL, dev->name);
1073         priv = dev->ml_priv;
1074         if (priv) {
1075                 grp = priv->mpcg;
1076                 if (grp) {
1077                         if (grp->fsm)
1078                                 kfree_fsm(grp->fsm);
1079                         if (grp->xid_skb)
1080                                 dev_kfree_skb(grp->xid_skb);
1081                         if (grp->rcvd_xid_skb)
1082                                 dev_kfree_skb(grp->rcvd_xid_skb);
1083                         tasklet_kill(&grp->mpc_tasklet2);
1084                         kfree(grp);
1085                         priv->mpcg = NULL;
1086                 }
1087                 if (priv->fsm) {
1088                         kfree_fsm(priv->fsm);
1089                         priv->fsm = NULL;
1090                 }
1091                 kfree(priv->xid);
1092                 priv->xid = NULL;
1093         /*
1094          * Note: kfree(priv); is done in "opposite" function of
1095          * allocator function probe_device which is remove_device.
1096          */
1097         }
1098 #ifdef MODULE
1099         free_netdev(dev);
1100 #endif
1101 }
1102
1103 struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv);
1104
1105 static const struct net_device_ops ctcm_netdev_ops = {
1106         .ndo_open               = ctcm_open,
1107         .ndo_stop               = ctcm_close,
1108         .ndo_get_stats          = ctcm_stats,
1109         .ndo_change_mtu         = ctcm_change_mtu,
1110         .ndo_start_xmit         = ctcm_tx,
1111 };
1112
1113 static const struct net_device_ops ctcm_mpc_netdev_ops = {
1114         .ndo_open               = ctcm_open,
1115         .ndo_stop               = ctcm_close,
1116         .ndo_get_stats          = ctcm_stats,
1117         .ndo_change_mtu         = ctcm_change_mtu,
1118         .ndo_start_xmit         = ctcmpc_tx,
1119 };
1120
1121 void static ctcm_dev_setup(struct net_device *dev)
1122 {
1123         dev->type = ARPHRD_SLIP;
1124         dev->tx_queue_len = 100;
1125         dev->flags = IFF_POINTOPOINT | IFF_NOARP;
1126 }
1127
1128 /*
1129  * Initialize everything of the net device except the name and the
1130  * channel structs.
1131  */
1132 static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv)
1133 {
1134         struct net_device *dev;
1135         struct mpc_group *grp;
1136         if (!priv)
1137                 return NULL;
1138
1139         if (IS_MPC(priv))
1140                 dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup);
1141         else
1142                 dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup);
1143
1144         if (!dev) {
1145                 CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT,
1146                         "%s: MEMORY allocation ERROR",
1147                         CTCM_FUNTAIL);
1148                 return NULL;
1149         }
1150         dev->ml_priv = priv;
1151         priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names,
1152                                 CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS,
1153                                 dev_fsm, dev_fsm_len, GFP_KERNEL);
1154         if (priv->fsm == NULL) {
1155                 CTCMY_DBF_DEV(SETUP, dev, "init_fsm error");
1156                 free_netdev(dev);
1157                 return NULL;
1158         }
1159         fsm_newstate(priv->fsm, DEV_STATE_STOPPED);
1160         fsm_settimer(priv->fsm, &priv->restart_timer);
1161
1162         if (IS_MPC(priv)) {
1163                 /*  MPC Group Initializations  */
1164                 grp = ctcmpc_init_mpc_group(priv);
1165                 if (grp == NULL) {
1166                         MPC_DBF_DEV(SETUP, dev, "init_mpc_group error");
1167                         free_netdev(dev);
1168                         return NULL;
1169                 }
1170                 tasklet_init(&grp->mpc_tasklet2,
1171                                 mpc_group_ready, (unsigned long)dev);
1172                 dev->mtu = MPC_BUFSIZE_DEFAULT -
1173                                 TH_HEADER_LENGTH - PDU_HEADER_LENGTH;
1174
1175                 dev->netdev_ops = &ctcm_mpc_netdev_ops;
1176                 dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH;
1177                 priv->buffer_size = MPC_BUFSIZE_DEFAULT;
1178         } else {
1179                 dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2;
1180                 dev->netdev_ops = &ctcm_netdev_ops;
1181                 dev->hard_header_len = LL_HEADER_LENGTH + 2;
1182         }
1183
1184         CTCMY_DBF_DEV(SETUP, dev, "finished");
1185
1186         return dev;
1187 }
1188
1189 /**
1190  * Main IRQ handler.
1191  *
1192  *  cdev        The ccw_device the interrupt is for.
1193  *  intparm     interruption parameter.
1194  *  irb         interruption response block.
1195  */
1196 static void ctcm_irq_handler(struct ccw_device *cdev,
1197                                 unsigned long intparm, struct irb *irb)
1198 {
1199         struct channel          *ch;
1200         struct net_device       *dev;
1201         struct ctcm_priv        *priv;
1202         struct ccwgroup_device  *cgdev;
1203         int cstat;
1204         int dstat;
1205
1206         kstat_cpu(smp_processor_id()).irqs[IOINT_CTC]++;
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         .driver = {
1766                 .owner  = THIS_MODULE,
1767                 .name   = "ctcm",
1768         },
1769         .ids    = ctcm_ids,
1770         .probe  = ccwgroup_probe_ccwdev,
1771         .remove = ccwgroup_remove_ccwdev,
1772 };
1773
1774 static struct ccwgroup_driver ctcm_group_driver = {
1775         .driver = {
1776                 .owner  = THIS_MODULE,
1777                 .name   = CTC_DRIVER_NAME,
1778         },
1779         .max_slaves  = 2,
1780         .driver_id   = 0xC3E3C3D4,      /* CTCM */
1781         .probe       = ctcm_probe_device,
1782         .remove      = ctcm_remove_device,
1783         .set_online  = ctcm_new_device,
1784         .set_offline = ctcm_shutdown_device,
1785         .freeze      = ctcm_pm_suspend,
1786         .thaw        = ctcm_pm_resume,
1787         .restore     = ctcm_pm_resume,
1788 };
1789
1790 static ssize_t
1791 ctcm_driver_group_store(struct device_driver *ddrv, const char *buf,
1792                         size_t count)
1793 {
1794         int err;
1795
1796         err = ccwgroup_create_from_string(ctcm_root_dev,
1797                                           ctcm_group_driver.driver_id,
1798                                           &ctcm_ccw_driver, 2, buf);
1799         return err ? err : count;
1800 }
1801
1802 static DRIVER_ATTR(group, 0200, NULL, ctcm_driver_group_store);
1803
1804 static struct attribute *ctcm_group_attrs[] = {
1805         &driver_attr_group.attr,
1806         NULL,
1807 };
1808
1809 static struct attribute_group ctcm_group_attr_group = {
1810         .attrs = ctcm_group_attrs,
1811 };
1812
1813 static const struct attribute_group *ctcm_group_attr_groups[] = {
1814         &ctcm_group_attr_group,
1815         NULL,
1816 };
1817
1818 /*
1819  * Module related routines
1820  */
1821
1822 /*
1823  * Prepare to be unloaded. Free IRQ's and release all resources.
1824  * This is called just before this module is unloaded. It is
1825  * not called, if the usage count is !0, so we don't need to check
1826  * for that.
1827  */
1828 static void __exit ctcm_exit(void)
1829 {
1830         driver_remove_file(&ctcm_group_driver.driver, &driver_attr_group);
1831         ccwgroup_driver_unregister(&ctcm_group_driver);
1832         ccw_driver_unregister(&ctcm_ccw_driver);
1833         root_device_unregister(ctcm_root_dev);
1834         ctcm_unregister_dbf_views();
1835         pr_info("CTCM driver unloaded\n");
1836 }
1837
1838 /*
1839  * Print Banner.
1840  */
1841 static void print_banner(void)
1842 {
1843         pr_info("CTCM driver initialized\n");
1844 }
1845
1846 /**
1847  * Initialize module.
1848  * This is called just after the module is loaded.
1849  *
1850  * returns 0 on success, !0 on error.
1851  */
1852 static int __init ctcm_init(void)
1853 {
1854         int ret;
1855
1856         channels = NULL;
1857
1858         ret = ctcm_register_dbf_views();
1859         if (ret)
1860                 goto out_err;
1861         ctcm_root_dev = root_device_register("ctcm");
1862         ret = IS_ERR(ctcm_root_dev) ? PTR_ERR(ctcm_root_dev) : 0;
1863         if (ret)
1864                 goto register_err;
1865         ret = ccw_driver_register(&ctcm_ccw_driver);
1866         if (ret)
1867                 goto ccw_err;
1868         ctcm_group_driver.driver.groups = ctcm_group_attr_groups;
1869         ret = ccwgroup_driver_register(&ctcm_group_driver);
1870         if (ret)
1871                 goto ccwgroup_err;
1872         print_banner();
1873         return 0;
1874
1875 ccwgroup_err:
1876         ccw_driver_unregister(&ctcm_ccw_driver);
1877 ccw_err:
1878         root_device_unregister(ctcm_root_dev);
1879 register_err:
1880         ctcm_unregister_dbf_views();
1881 out_err:
1882         pr_err("%s / Initializing the ctcm device driver failed, ret = %d\n",
1883                 __func__, ret);
1884         return ret;
1885 }
1886
1887 module_init(ctcm_init);
1888 module_exit(ctcm_exit);
1889
1890 MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>");
1891 MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)");
1892 MODULE_LICENSE("GPL");
1893