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293d984f PT |
1 | /* |
2 | * drivers/s390/net/ctcm_main.c | |
3 | * | |
4 | * Copyright IBM Corp. 2001, 2007 | |
5 | * Author(s): | |
6 | * Original CTC driver(s): | |
7 | * Fritz Elfert (felfert@millenux.com) | |
8 | * Dieter Wellerdiek (wel@de.ibm.com) | |
9 | * Martin Schwidefsky (schwidefsky@de.ibm.com) | |
10 | * Denis Joseph Barrow (barrow_dj@yahoo.com) | |
11 | * Jochen Roehrig (roehrig@de.ibm.com) | |
12 | * Cornelia Huck <cornelia.huck@de.ibm.com> | |
13 | * MPC additions: | |
14 | * Belinda Thompson (belindat@us.ibm.com) | |
15 | * Andy Richter (richtera@us.ibm.com) | |
16 | * Revived by: | |
17 | * Peter Tiedemann (ptiedem@de.ibm.com) | |
18 | */ | |
19 | ||
20 | #undef DEBUG | |
21 | #undef DEBUGDATA | |
22 | #undef DEBUGCCW | |
23 | ||
24 | #include <linux/module.h> | |
25 | #include <linux/init.h> | |
26 | #include <linux/kernel.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/errno.h> | |
29 | #include <linux/types.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/timer.h> | |
32 | #include <linux/bitops.h> | |
33 | ||
34 | #include <linux/signal.h> | |
35 | #include <linux/string.h> | |
36 | ||
37 | #include <linux/ip.h> | |
38 | #include <linux/if_arp.h> | |
39 | #include <linux/tcp.h> | |
40 | #include <linux/skbuff.h> | |
41 | #include <linux/ctype.h> | |
42 | #include <net/dst.h> | |
43 | ||
44 | #include <linux/io.h> | |
45 | #include <asm/ccwdev.h> | |
46 | #include <asm/ccwgroup.h> | |
47 | #include <linux/uaccess.h> | |
48 | ||
49 | #include <asm/idals.h> | |
50 | ||
51 | #include "cu3088.h" | |
52 | #include "ctcm_fsms.h" | |
53 | #include "ctcm_main.h" | |
54 | ||
55 | /* Some common global variables */ | |
56 | ||
57 | /* | |
58 | * Linked list of all detected channels. | |
59 | */ | |
60 | struct channel *channels; | |
61 | ||
62 | /** | |
63 | * Unpack a just received skb and hand it over to | |
64 | * upper layers. | |
65 | * | |
66 | * ch The channel where this skb has been received. | |
67 | * pskb The received skb. | |
68 | */ | |
69 | void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) | |
70 | { | |
71 | struct net_device *dev = ch->netdev; | |
72 | struct ctcm_priv *priv = dev->priv; | |
73 | __u16 len = *((__u16 *) pskb->data); | |
74 | ||
75 | skb_put(pskb, 2 + LL_HEADER_LENGTH); | |
76 | skb_pull(pskb, 2); | |
77 | pskb->dev = dev; | |
78 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
79 | while (len > 0) { | |
80 | struct sk_buff *skb; | |
81 | int skblen; | |
82 | struct ll_header *header = (struct ll_header *)pskb->data; | |
83 | ||
84 | skb_pull(pskb, LL_HEADER_LENGTH); | |
85 | if ((ch->protocol == CTCM_PROTO_S390) && | |
86 | (header->type != ETH_P_IP)) { | |
87 | ||
88 | if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { | |
89 | /* | |
90 | * Check packet type only if we stick strictly | |
91 | * to S/390's protocol of OS390. This only | |
92 | * supports IP. Otherwise allow any packet | |
93 | * type. | |
94 | */ | |
95 | ctcm_pr_warn("%s Illegal packet type 0x%04x " | |
96 | "received, dropping\n", | |
97 | dev->name, header->type); | |
98 | ch->logflags |= LOG_FLAG_ILLEGALPKT; | |
99 | } | |
100 | ||
101 | priv->stats.rx_dropped++; | |
102 | priv->stats.rx_frame_errors++; | |
103 | return; | |
104 | } | |
105 | pskb->protocol = ntohs(header->type); | |
106 | if (header->length <= LL_HEADER_LENGTH) { | |
107 | if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { | |
108 | ctcm_pr_warn( | |
109 | "%s Illegal packet size %d " | |
110 | "received (MTU=%d blocklen=%d), " | |
111 | "dropping\n", dev->name, header->length, | |
112 | dev->mtu, len); | |
113 | ch->logflags |= LOG_FLAG_ILLEGALSIZE; | |
114 | } | |
115 | ||
116 | priv->stats.rx_dropped++; | |
117 | priv->stats.rx_length_errors++; | |
118 | return; | |
119 | } | |
120 | header->length -= LL_HEADER_LENGTH; | |
121 | len -= LL_HEADER_LENGTH; | |
122 | if ((header->length > skb_tailroom(pskb)) || | |
123 | (header->length > len)) { | |
124 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { | |
125 | ctcm_pr_warn( | |
126 | "%s Illegal packet size %d (beyond the" | |
127 | " end of received data), dropping\n", | |
128 | dev->name, header->length); | |
129 | ch->logflags |= LOG_FLAG_OVERRUN; | |
130 | } | |
131 | ||
132 | priv->stats.rx_dropped++; | |
133 | priv->stats.rx_length_errors++; | |
134 | return; | |
135 | } | |
136 | skb_put(pskb, header->length); | |
137 | skb_reset_mac_header(pskb); | |
138 | len -= header->length; | |
139 | skb = dev_alloc_skb(pskb->len); | |
140 | if (!skb) { | |
141 | if (!(ch->logflags & LOG_FLAG_NOMEM)) { | |
142 | ctcm_pr_warn( | |
143 | "%s Out of memory in ctcm_unpack_skb\n", | |
144 | dev->name); | |
145 | ch->logflags |= LOG_FLAG_NOMEM; | |
146 | } | |
147 | priv->stats.rx_dropped++; | |
148 | return; | |
149 | } | |
150 | skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), | |
151 | pskb->len); | |
152 | skb_reset_mac_header(skb); | |
153 | skb->dev = pskb->dev; | |
154 | skb->protocol = pskb->protocol; | |
155 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
156 | skblen = skb->len; | |
157 | /* | |
158 | * reset logflags | |
159 | */ | |
160 | ch->logflags = 0; | |
161 | priv->stats.rx_packets++; | |
162 | priv->stats.rx_bytes += skblen; | |
163 | netif_rx_ni(skb); | |
164 | dev->last_rx = jiffies; | |
165 | if (len > 0) { | |
166 | skb_pull(pskb, header->length); | |
167 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { | |
168 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { | |
169 | CTCM_DBF_DEV_NAME(TRACE, dev, | |
170 | "Overrun in ctcm_unpack_skb"); | |
171 | ch->logflags |= LOG_FLAG_OVERRUN; | |
172 | } | |
173 | return; | |
174 | } | |
175 | skb_put(pskb, LL_HEADER_LENGTH); | |
176 | } | |
177 | } | |
178 | } | |
179 | ||
180 | /** | |
181 | * Release a specific channel in the channel list. | |
182 | * | |
183 | * ch Pointer to channel struct to be released. | |
184 | */ | |
185 | static void channel_free(struct channel *ch) | |
186 | { | |
187 | CTCM_DBF_TEXT(TRACE, 2, __FUNCTION__); | |
188 | ch->flags &= ~CHANNEL_FLAGS_INUSE; | |
189 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
190 | } | |
191 | ||
192 | /** | |
193 | * Remove a specific channel in the channel list. | |
194 | * | |
195 | * ch Pointer to channel struct to be released. | |
196 | */ | |
197 | static void channel_remove(struct channel *ch) | |
198 | { | |
199 | struct channel **c = &channels; | |
200 | char chid[CTCM_ID_SIZE+1]; | |
201 | int ok = 0; | |
202 | ||
203 | if (ch == NULL) | |
204 | return; | |
205 | else | |
206 | strncpy(chid, ch->id, CTCM_ID_SIZE); | |
207 | ||
208 | channel_free(ch); | |
209 | while (*c) { | |
210 | if (*c == ch) { | |
211 | *c = ch->next; | |
212 | fsm_deltimer(&ch->timer); | |
213 | if (IS_MPC(ch)) | |
214 | fsm_deltimer(&ch->sweep_timer); | |
215 | ||
216 | kfree_fsm(ch->fsm); | |
217 | clear_normalized_cda(&ch->ccw[4]); | |
218 | if (ch->trans_skb != NULL) { | |
219 | clear_normalized_cda(&ch->ccw[1]); | |
220 | dev_kfree_skb_any(ch->trans_skb); | |
221 | } | |
222 | if (IS_MPC(ch)) { | |
223 | tasklet_kill(&ch->ch_tasklet); | |
224 | tasklet_kill(&ch->ch_disc_tasklet); | |
225 | kfree(ch->discontact_th); | |
226 | } | |
227 | kfree(ch->ccw); | |
228 | kfree(ch->irb); | |
229 | kfree(ch); | |
230 | ok = 1; | |
231 | break; | |
232 | } | |
233 | c = &((*c)->next); | |
234 | } | |
235 | ||
236 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, | |
237 | chid, ok ? "OK" : "failed"); | |
238 | } | |
239 | ||
240 | /** | |
241 | * Get a specific channel from the channel list. | |
242 | * | |
243 | * type Type of channel we are interested in. | |
244 | * id Id of channel we are interested in. | |
245 | * direction Direction we want to use this channel for. | |
246 | * | |
247 | * returns Pointer to a channel or NULL if no matching channel available. | |
248 | */ | |
249 | static struct channel *channel_get(enum channel_types type, | |
250 | char *id, int direction) | |
251 | { | |
252 | struct channel *ch = channels; | |
253 | ||
254 | if (do_debug) { | |
255 | char buf[64]; | |
256 | sprintf(buf, "%s(%d, %s, %d)\n", | |
257 | CTCM_FUNTAIL, type, id, direction); | |
258 | CTCM_DBF_TEXT(TRACE, CTC_DBF_INFO, buf); | |
259 | } | |
260 | while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) | |
261 | ch = ch->next; | |
262 | if (!ch) { | |
263 | char buf[64]; | |
264 | sprintf(buf, "%s(%d, %s, %d) not found in channel list\n", | |
265 | CTCM_FUNTAIL, type, id, direction); | |
266 | CTCM_DBF_TEXT(ERROR, CTC_DBF_ERROR, buf); | |
267 | } else { | |
268 | if (ch->flags & CHANNEL_FLAGS_INUSE) | |
269 | ch = NULL; | |
270 | else { | |
271 | ch->flags |= CHANNEL_FLAGS_INUSE; | |
272 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; | |
273 | ch->flags |= (direction == WRITE) | |
274 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; | |
275 | fsm_newstate(ch->fsm, CTC_STATE_STOPPED); | |
276 | } | |
277 | } | |
278 | return ch; | |
279 | } | |
280 | ||
281 | static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) | |
282 | { | |
283 | if (!IS_ERR(irb)) | |
284 | return 0; | |
285 | ||
286 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, "irb error %ld on device %s\n", | |
287 | PTR_ERR(irb), cdev->dev.bus_id); | |
288 | ||
289 | switch (PTR_ERR(irb)) { | |
290 | case -EIO: | |
291 | ctcm_pr_warn("i/o-error on device %s\n", cdev->dev.bus_id); | |
292 | break; | |
293 | case -ETIMEDOUT: | |
294 | ctcm_pr_warn("timeout on device %s\n", cdev->dev.bus_id); | |
295 | break; | |
296 | default: | |
297 | ctcm_pr_warn("unknown error %ld on device %s\n", | |
298 | PTR_ERR(irb), cdev->dev.bus_id); | |
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, unsigned char sense) | |
311 | { | |
312 | CTCM_DBF_TEXT(TRACE, 5, __FUNCTION__); | |
313 | if (sense & SNS0_INTERVENTION_REQ) { | |
314 | if (sense & 0x01) { | |
315 | ctcm_pr_debug("%s: Interface disc. or Sel. reset " | |
316 | "(remote)\n", ch->id); | |
317 | fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); | |
318 | } else { | |
319 | ctcm_pr_debug("%s: System reset (remote)\n", ch->id); | |
320 | fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); | |
321 | } | |
322 | } else if (sense & SNS0_EQUIPMENT_CHECK) { | |
323 | if (sense & SNS0_BUS_OUT_CHECK) { | |
324 | ctcm_pr_warn("%s: Hardware malfunction (remote)\n", | |
325 | ch->id); | |
326 | fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); | |
327 | } else { | |
328 | ctcm_pr_warn("%s: Read-data parity error (remote)\n", | |
329 | ch->id); | |
330 | fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); | |
331 | } | |
332 | } else if (sense & SNS0_BUS_OUT_CHECK) { | |
333 | if (sense & 0x04) { | |
334 | ctcm_pr_warn("%s: Data-streaming timeout)\n", ch->id); | |
335 | fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); | |
336 | } else { | |
337 | ctcm_pr_warn("%s: Data-transfer parity error\n", | |
338 | ch->id); | |
339 | fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); | |
340 | } | |
341 | } else if (sense & SNS0_CMD_REJECT) { | |
342 | ctcm_pr_warn("%s: Command reject\n", ch->id); | |
343 | } else if (sense == 0) { | |
344 | ctcm_pr_debug("%s: Unit check ZERO\n", ch->id); | |
345 | fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); | |
346 | } else { | |
347 | ctcm_pr_warn("%s: Unit Check with sense code: %02x\n", | |
348 | ch->id, sense); | |
349 | fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); | |
350 | } | |
351 | } | |
352 | ||
353 | int ctcm_ch_alloc_buffer(struct channel *ch) | |
354 | { | |
355 | CTCM_DBF_TEXT(TRACE, 5, __FUNCTION__); | |
356 | ||
357 | clear_normalized_cda(&ch->ccw[1]); | |
358 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); | |
359 | if (ch->trans_skb == NULL) { | |
360 | ctcm_pr_warn("%s: Couldn't alloc %s trans_skb\n", | |
361 | ch->id, | |
362 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); | |
363 | return -ENOMEM; | |
364 | } | |
365 | ||
366 | ch->ccw[1].count = ch->max_bufsize; | |
367 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { | |
368 | dev_kfree_skb(ch->trans_skb); | |
369 | ch->trans_skb = NULL; | |
370 | ctcm_pr_warn("%s: set_normalized_cda for %s " | |
371 | "trans_skb failed, dropping packets\n", | |
372 | ch->id, | |
373 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); | |
374 | return -ENOMEM; | |
375 | } | |
376 | ||
377 | ch->ccw[1].count = 0; | |
378 | ch->trans_skb_data = ch->trans_skb->data; | |
379 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; | |
380 | return 0; | |
381 | } | |
382 | ||
383 | /* | |
384 | * Interface API for upper network layers | |
385 | */ | |
386 | ||
387 | /** | |
388 | * Open an interface. | |
389 | * Called from generic network layer when ifconfig up is run. | |
390 | * | |
391 | * dev Pointer to interface struct. | |
392 | * | |
393 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
394 | */ | |
395 | int ctcm_open(struct net_device *dev) | |
396 | { | |
397 | struct ctcm_priv *priv = dev->priv; | |
398 | ||
399 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
400 | if (!IS_MPC(priv)) | |
401 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
402 | return 0; | |
403 | } | |
404 | ||
405 | /** | |
406 | * Close an interface. | |
407 | * Called from generic network layer when ifconfig down is run. | |
408 | * | |
409 | * dev Pointer to interface struct. | |
410 | * | |
411 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
412 | */ | |
413 | int ctcm_close(struct net_device *dev) | |
414 | { | |
415 | struct ctcm_priv *priv = dev->priv; | |
416 | ||
417 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
418 | if (!IS_MPC(priv)) | |
419 | fsm_event(priv->fsm, DEV_EVENT_STOP, dev); | |
420 | return 0; | |
421 | } | |
422 | ||
423 | ||
424 | /** | |
425 | * Transmit a packet. | |
426 | * This is a helper function for ctcm_tx(). | |
427 | * | |
428 | * ch Channel to be used for sending. | |
429 | * skb Pointer to struct sk_buff of packet to send. | |
430 | * The linklevel header has already been set up | |
431 | * by ctcm_tx(). | |
432 | * | |
433 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
434 | */ | |
435 | static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
436 | { | |
437 | unsigned long saveflags; | |
438 | struct ll_header header; | |
439 | int rc = 0; | |
440 | __u16 block_len; | |
441 | int ccw_idx; | |
442 | struct sk_buff *nskb; | |
443 | unsigned long hi; | |
444 | ||
445 | /* we need to acquire the lock for testing the state | |
446 | * otherwise we can have an IRQ changing the state to | |
447 | * TXIDLE after the test but before acquiring the lock. | |
448 | */ | |
449 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
450 | if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { | |
451 | int l = skb->len + LL_HEADER_LENGTH; | |
452 | ||
453 | if (ch->collect_len + l > ch->max_bufsize - 2) { | |
454 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
455 | return -EBUSY; | |
456 | } else { | |
457 | atomic_inc(&skb->users); | |
458 | header.length = l; | |
459 | header.type = skb->protocol; | |
460 | header.unused = 0; | |
461 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | |
462 | LL_HEADER_LENGTH); | |
463 | skb_queue_tail(&ch->collect_queue, skb); | |
464 | ch->collect_len += l; | |
465 | } | |
466 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
467 | goto done; | |
468 | } | |
469 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
470 | /* | |
471 | * Protect skb against beeing free'd by upper | |
472 | * layers. | |
473 | */ | |
474 | atomic_inc(&skb->users); | |
475 | ch->prof.txlen += skb->len; | |
476 | header.length = skb->len + LL_HEADER_LENGTH; | |
477 | header.type = skb->protocol; | |
478 | header.unused = 0; | |
479 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); | |
480 | block_len = skb->len + 2; | |
481 | *((__u16 *)skb_push(skb, 2)) = block_len; | |
482 | ||
483 | /* | |
484 | * IDAL support in CTCM is broken, so we have to | |
485 | * care about skb's above 2G ourselves. | |
486 | */ | |
487 | hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; | |
488 | if (hi) { | |
489 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
490 | if (!nskb) { | |
491 | atomic_dec(&skb->users); | |
492 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
493 | ctcm_clear_busy(ch->netdev); | |
494 | return -ENOMEM; | |
495 | } else { | |
496 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
497 | atomic_inc(&nskb->users); | |
498 | atomic_dec(&skb->users); | |
499 | dev_kfree_skb_irq(skb); | |
500 | skb = nskb; | |
501 | } | |
502 | } | |
503 | ||
504 | ch->ccw[4].count = block_len; | |
505 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
506 | /* | |
507 | * idal allocation failed, try via copying to | |
508 | * trans_skb. trans_skb usually has a pre-allocated | |
509 | * idal. | |
510 | */ | |
511 | if (ctcm_checkalloc_buffer(ch)) { | |
512 | /* | |
513 | * Remove our header. It gets added | |
514 | * again on retransmit. | |
515 | */ | |
516 | atomic_dec(&skb->users); | |
517 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
518 | ctcm_clear_busy(ch->netdev); | |
519 | return -EBUSY; | |
520 | } | |
521 | ||
522 | skb_reset_tail_pointer(ch->trans_skb); | |
523 | ch->trans_skb->len = 0; | |
524 | ch->ccw[1].count = skb->len; | |
525 | skb_copy_from_linear_data(skb, | |
526 | skb_put(ch->trans_skb, skb->len), skb->len); | |
527 | atomic_dec(&skb->users); | |
528 | dev_kfree_skb_irq(skb); | |
529 | ccw_idx = 0; | |
530 | } else { | |
531 | skb_queue_tail(&ch->io_queue, skb); | |
532 | ccw_idx = 3; | |
533 | } | |
534 | ch->retry = 0; | |
535 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
536 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
537 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
538 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
539 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
540 | (unsigned long)ch, 0xff, 0); | |
541 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
542 | if (ccw_idx == 3) | |
543 | ch->prof.doios_single++; | |
544 | if (rc != 0) { | |
545 | fsm_deltimer(&ch->timer); | |
546 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
547 | if (ccw_idx == 3) | |
548 | skb_dequeue_tail(&ch->io_queue); | |
549 | /* | |
550 | * Remove our header. It gets added | |
551 | * again on retransmit. | |
552 | */ | |
553 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
554 | } else if (ccw_idx == 0) { | |
555 | struct net_device *dev = ch->netdev; | |
556 | struct ctcm_priv *priv = dev->priv; | |
557 | priv->stats.tx_packets++; | |
558 | priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | |
559 | } | |
560 | done: | |
561 | ctcm_clear_busy(ch->netdev); | |
562 | return rc; | |
563 | } | |
564 | ||
565 | static void ctcmpc_send_sweep_req(struct channel *rch) | |
566 | { | |
567 | struct net_device *dev = rch->netdev; | |
568 | struct ctcm_priv *priv; | |
569 | struct mpc_group *grp; | |
570 | struct th_sweep *header; | |
571 | struct sk_buff *sweep_skb; | |
572 | struct channel *ch; | |
573 | int rc = 0; | |
574 | ||
575 | priv = dev->priv; | |
576 | grp = priv->mpcg; | |
577 | ch = priv->channel[WRITE]; | |
578 | ||
579 | if (do_debug) | |
580 | MPC_DBF_DEV_NAME(TRACE, dev, ch->id); | |
581 | ||
582 | /* sweep processing is not complete until response and request */ | |
583 | /* has completed for all read channels in group */ | |
584 | if (grp->in_sweep == 0) { | |
585 | grp->in_sweep = 1; | |
586 | grp->sweep_rsp_pend_num = grp->active_channels[READ]; | |
587 | grp->sweep_req_pend_num = grp->active_channels[READ]; | |
588 | } | |
589 | ||
590 | sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); | |
591 | ||
592 | if (sweep_skb == NULL) { | |
593 | printk(KERN_INFO "Couldn't alloc sweep_skb\n"); | |
594 | rc = -ENOMEM; | |
595 | goto done; | |
596 | } | |
597 | ||
598 | header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); | |
599 | ||
600 | if (!header) { | |
601 | dev_kfree_skb_any(sweep_skb); | |
602 | rc = -ENOMEM; | |
603 | goto done; | |
604 | } | |
605 | ||
606 | header->th.th_seg = 0x00 ; | |
607 | header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ | |
608 | header->th.th_blk_flag = 0x00; | |
609 | header->th.th_is_xid = 0x00; | |
610 | header->th.th_seq_num = 0x00; | |
611 | header->sw.th_last_seq = ch->th_seq_num; | |
612 | ||
613 | memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); | |
614 | ||
615 | kfree(header); | |
616 | ||
617 | dev->trans_start = jiffies; | |
618 | skb_queue_tail(&ch->sweep_queue, sweep_skb); | |
619 | ||
620 | fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); | |
621 | ||
622 | return; | |
623 | ||
624 | done: | |
625 | if (rc != 0) { | |
626 | grp->in_sweep = 0; | |
627 | ctcm_clear_busy(dev); | |
628 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
629 | } | |
630 | ||
631 | return; | |
632 | } | |
633 | ||
634 | /* | |
635 | * MPC mode version of transmit_skb | |
636 | */ | |
637 | static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
638 | { | |
639 | struct pdu *p_header; | |
640 | struct net_device *dev = ch->netdev; | |
641 | struct ctcm_priv *priv = dev->priv; | |
642 | struct mpc_group *grp = priv->mpcg; | |
643 | struct th_header *header; | |
644 | struct sk_buff *nskb; | |
645 | int rc = 0; | |
646 | int ccw_idx; | |
647 | unsigned long hi; | |
648 | unsigned long saveflags = 0; /* avoids compiler warning */ | |
649 | __u16 block_len; | |
650 | ||
651 | if (do_debug) | |
652 | ctcm_pr_debug( | |
653 | "ctcm enter: %s(): %s cp=%i ch=0x%p id=%s state=%s\n", | |
654 | __FUNCTION__, dev->name, smp_processor_id(), ch, | |
655 | ch->id, fsm_getstate_str(ch->fsm)); | |
656 | ||
657 | if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { | |
658 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
659 | atomic_inc(&skb->users); | |
660 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
661 | ||
662 | if (!p_header) { | |
663 | printk(KERN_WARNING "ctcm: OUT OF MEMORY IN %s():" | |
664 | " Data Lost \n", __FUNCTION__); | |
665 | ||
666 | atomic_dec(&skb->users); | |
667 | dev_kfree_skb_any(skb); | |
668 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
669 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
670 | goto done; | |
671 | } | |
672 | ||
673 | p_header->pdu_offset = skb->len; | |
674 | p_header->pdu_proto = 0x01; | |
675 | p_header->pdu_flag = 0x00; | |
676 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
677 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
678 | } else { | |
679 | p_header->pdu_flag |= PDU_FIRST; | |
680 | } | |
681 | p_header->pdu_seq = 0; | |
682 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, | |
683 | PDU_HEADER_LENGTH); | |
684 | ||
685 | if (do_debug_data) { | |
686 | ctcm_pr_debug("ctcm: %s() Putting on collect_q" | |
687 | " - skb len: %04x \n", __FUNCTION__, skb->len); | |
688 | ctcm_pr_debug("ctcm: %s() pdu header and data" | |
689 | " for up to 32 bytes\n", __FUNCTION__); | |
690 | ctcmpc_dump32((char *)skb->data, skb->len); | |
691 | } | |
692 | ||
693 | skb_queue_tail(&ch->collect_queue, skb); | |
694 | ch->collect_len += skb->len; | |
695 | kfree(p_header); | |
696 | ||
697 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
698 | goto done; | |
699 | } | |
700 | ||
701 | /* | |
702 | * Protect skb against beeing free'd by upper | |
703 | * layers. | |
704 | */ | |
705 | atomic_inc(&skb->users); | |
706 | ||
707 | block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
708 | /* | |
709 | * IDAL support in CTCM is broken, so we have to | |
710 | * care about skb's above 2G ourselves. | |
711 | */ | |
712 | hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; | |
713 | if (hi) { | |
714 | nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
715 | if (!nskb) { | |
716 | printk(KERN_WARNING "ctcm: %s() OUT OF MEMORY" | |
717 | "- Data Lost \n", __FUNCTION__); | |
718 | atomic_dec(&skb->users); | |
719 | dev_kfree_skb_any(skb); | |
720 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
721 | goto done; | |
722 | } else { | |
723 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
724 | atomic_inc(&nskb->users); | |
725 | atomic_dec(&skb->users); | |
726 | dev_kfree_skb_irq(skb); | |
727 | skb = nskb; | |
728 | } | |
729 | } | |
730 | ||
731 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
732 | ||
733 | if (!p_header) { | |
734 | printk(KERN_WARNING "ctcm: %s() OUT OF MEMORY" | |
735 | ": Data Lost \n", __FUNCTION__); | |
736 | ||
737 | atomic_dec(&skb->users); | |
738 | dev_kfree_skb_any(skb); | |
739 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
740 | goto done; | |
741 | } | |
742 | ||
743 | p_header->pdu_offset = skb->len; | |
744 | p_header->pdu_proto = 0x01; | |
745 | p_header->pdu_flag = 0x00; | |
746 | p_header->pdu_seq = 0; | |
747 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
748 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
749 | } else { | |
750 | p_header->pdu_flag |= PDU_FIRST; | |
751 | } | |
752 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); | |
753 | ||
754 | kfree(p_header); | |
755 | ||
756 | if (ch->collect_len > 0) { | |
757 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
758 | skb_queue_tail(&ch->collect_queue, skb); | |
759 | ch->collect_len += skb->len; | |
760 | skb = skb_dequeue(&ch->collect_queue); | |
761 | ch->collect_len -= skb->len; | |
762 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
763 | } | |
764 | ||
765 | p_header = (struct pdu *)skb->data; | |
766 | p_header->pdu_flag |= PDU_LAST; | |
767 | ||
768 | ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; | |
769 | ||
770 | header = kmalloc(TH_HEADER_LENGTH, gfp_type()); | |
771 | ||
772 | if (!header) { | |
773 | printk(KERN_WARNING "ctcm: %s() OUT OF MEMORY: Data Lost \n", | |
774 | __FUNCTION__); | |
775 | atomic_dec(&skb->users); | |
776 | dev_kfree_skb_any(skb); | |
777 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
778 | goto done; | |
779 | } | |
780 | ||
781 | header->th_seg = 0x00; | |
782 | header->th_ch_flag = TH_HAS_PDU; /* Normal data */ | |
783 | header->th_blk_flag = 0x00; | |
784 | header->th_is_xid = 0x00; /* Just data here */ | |
785 | ch->th_seq_num++; | |
786 | header->th_seq_num = ch->th_seq_num; | |
787 | ||
788 | if (do_debug_data) | |
789 | ctcm_pr_debug("ctcm: %s() ToVTAM_th_seq= %08x\n" , | |
790 | __FUNCTION__, ch->th_seq_num); | |
791 | ||
792 | /* put the TH on the packet */ | |
793 | memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); | |
794 | ||
795 | kfree(header); | |
796 | ||
797 | if (do_debug_data) { | |
798 | ctcm_pr_debug("ctcm: %s(): skb len: %04x \n", | |
799 | __FUNCTION__, skb->len); | |
800 | ctcm_pr_debug("ctcm: %s(): pdu header and data for up to 32 " | |
801 | "bytes sent to vtam\n", __FUNCTION__); | |
802 | ctcmpc_dump32((char *)skb->data, skb->len); | |
803 | } | |
804 | ||
805 | ch->ccw[4].count = skb->len; | |
806 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
807 | /* | |
808 | * idal allocation failed, try via copying to | |
809 | * trans_skb. trans_skb usually has a pre-allocated | |
810 | * idal. | |
811 | */ | |
812 | if (ctcm_checkalloc_buffer(ch)) { | |
813 | /* | |
814 | * Remove our header. It gets added | |
815 | * again on retransmit. | |
816 | */ | |
817 | atomic_dec(&skb->users); | |
818 | dev_kfree_skb_any(skb); | |
819 | printk(KERN_WARNING "ctcm: %s()OUT OF MEMORY:" | |
820 | " Data Lost \n", __FUNCTION__); | |
821 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
822 | goto done; | |
823 | } | |
824 | ||
825 | skb_reset_tail_pointer(ch->trans_skb); | |
826 | ch->trans_skb->len = 0; | |
827 | ch->ccw[1].count = skb->len; | |
828 | memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); | |
829 | atomic_dec(&skb->users); | |
830 | dev_kfree_skb_irq(skb); | |
831 | ccw_idx = 0; | |
832 | if (do_debug_data) { | |
833 | ctcm_pr_debug("ctcm: %s() TRANS skb len: %d \n", | |
834 | __FUNCTION__, ch->trans_skb->len); | |
835 | ctcm_pr_debug("ctcm: %s up to 32 bytes of data" | |
836 | " sent to vtam\n", __FUNCTION__); | |
837 | ctcmpc_dump32((char *)ch->trans_skb->data, | |
838 | ch->trans_skb->len); | |
839 | } | |
840 | } else { | |
841 | skb_queue_tail(&ch->io_queue, skb); | |
842 | ccw_idx = 3; | |
843 | } | |
844 | ch->retry = 0; | |
845 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
846 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
847 | ||
848 | if (do_debug_ccw) | |
849 | ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], | |
850 | sizeof(struct ccw1) * 3); | |
851 | ||
852 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
853 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
854 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
855 | (unsigned long)ch, 0xff, 0); | |
856 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
857 | if (ccw_idx == 3) | |
858 | ch->prof.doios_single++; | |
859 | if (rc != 0) { | |
860 | fsm_deltimer(&ch->timer); | |
861 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
862 | if (ccw_idx == 3) | |
863 | skb_dequeue_tail(&ch->io_queue); | |
864 | } else if (ccw_idx == 0) { | |
865 | priv->stats.tx_packets++; | |
866 | priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; | |
867 | } | |
868 | if (ch->th_seq_num > 0xf0000000) /* Chose 4Billion at random. */ | |
869 | ctcmpc_send_sweep_req(ch); | |
870 | ||
871 | done: | |
872 | if (do_debug) | |
873 | ctcm_pr_debug("ctcm exit: %s %s()\n", dev->name, __FUNCTION__); | |
874 | return 0; | |
875 | } | |
876 | ||
877 | /** | |
878 | * Start transmission of a packet. | |
879 | * Called from generic network device layer. | |
880 | * | |
881 | * skb Pointer to buffer containing the packet. | |
882 | * dev Pointer to interface struct. | |
883 | * | |
884 | * returns 0 if packet consumed, !0 if packet rejected. | |
885 | * Note: If we return !0, then the packet is free'd by | |
886 | * the generic network layer. | |
887 | */ | |
888 | /* first merge version - leaving both functions separated */ | |
889 | static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) | |
890 | { | |
891 | int rc = 0; | |
892 | struct ctcm_priv *priv; | |
893 | ||
894 | CTCM_DBF_TEXT(TRACE, 5, __FUNCTION__); | |
895 | priv = dev->priv; | |
896 | ||
897 | if (skb == NULL) { | |
898 | ctcm_pr_warn("%s: NULL sk_buff passed\n", dev->name); | |
899 | priv->stats.tx_dropped++; | |
900 | return 0; | |
901 | } | |
902 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { | |
903 | ctcm_pr_warn("%s: Got sk_buff with head room < %ld bytes\n", | |
904 | dev->name, LL_HEADER_LENGTH + 2); | |
905 | dev_kfree_skb(skb); | |
906 | priv->stats.tx_dropped++; | |
907 | return 0; | |
908 | } | |
909 | ||
910 | /* | |
911 | * If channels are not running, try to restart them | |
912 | * and throw away packet. | |
913 | */ | |
914 | if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { | |
915 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
916 | dev_kfree_skb(skb); | |
917 | priv->stats.tx_dropped++; | |
918 | priv->stats.tx_errors++; | |
919 | priv->stats.tx_carrier_errors++; | |
920 | return 0; | |
921 | } | |
922 | ||
923 | if (ctcm_test_and_set_busy(dev)) | |
924 | return -EBUSY; | |
925 | ||
926 | dev->trans_start = jiffies; | |
927 | if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0) | |
928 | rc = 1; | |
929 | return rc; | |
930 | } | |
931 | ||
932 | /* unmerged MPC variant of ctcm_tx */ | |
933 | static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) | |
934 | { | |
935 | int len = 0; | |
936 | struct ctcm_priv *priv = NULL; | |
937 | struct mpc_group *grp = NULL; | |
938 | struct sk_buff *newskb = NULL; | |
939 | ||
940 | if (do_debug) | |
941 | ctcm_pr_debug("ctcmpc enter: %s(): skb:%0lx\n", | |
942 | __FUNCTION__, (unsigned long)skb); | |
943 | ||
944 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_DEBUG, | |
945 | "ctcmpc enter: %s(): skb:%0lx\n", | |
946 | __FUNCTION__, (unsigned long)skb); | |
947 | ||
948 | priv = dev->priv; | |
949 | grp = priv->mpcg; | |
950 | /* | |
951 | * Some sanity checks ... | |
952 | */ | |
953 | if (skb == NULL) { | |
954 | ctcm_pr_warn("ctcmpc: %s: NULL sk_buff passed\n", dev->name); | |
955 | priv->stats.tx_dropped++; | |
956 | goto done; | |
957 | } | |
958 | if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { | |
959 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_WARN, | |
960 | "%s: Got sk_buff with head room < %ld bytes\n", | |
961 | dev->name, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
962 | ||
963 | if (do_debug_data) | |
964 | ctcmpc_dump32((char *)skb->data, skb->len); | |
965 | ||
966 | len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
967 | newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); | |
968 | ||
969 | if (!newskb) { | |
970 | printk(KERN_WARNING "ctcmpc: %s() OUT OF MEMORY-" | |
971 | "Data Lost\n", | |
972 | __FUNCTION__); | |
973 | ||
974 | dev_kfree_skb_any(skb); | |
975 | priv->stats.tx_dropped++; | |
976 | priv->stats.tx_errors++; | |
977 | priv->stats.tx_carrier_errors++; | |
978 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
979 | goto done; | |
980 | } | |
981 | newskb->protocol = skb->protocol; | |
982 | skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
983 | memcpy(skb_put(newskb, skb->len), skb->data, skb->len); | |
984 | dev_kfree_skb_any(skb); | |
985 | skb = newskb; | |
986 | } | |
987 | ||
988 | /* | |
989 | * If channels are not running, | |
990 | * notify anybody about a link failure and throw | |
991 | * away packet. | |
992 | */ | |
993 | if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || | |
994 | (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { | |
995 | dev_kfree_skb_any(skb); | |
996 | printk(KERN_INFO "ctcmpc: %s() DATA RCVD - MPC GROUP " | |
997 | "NOT ACTIVE - DROPPED\n", | |
998 | __FUNCTION__); | |
999 | priv->stats.tx_dropped++; | |
1000 | priv->stats.tx_errors++; | |
1001 | priv->stats.tx_carrier_errors++; | |
1002 | goto done; | |
1003 | } | |
1004 | ||
1005 | if (ctcm_test_and_set_busy(dev)) { | |
1006 | printk(KERN_WARNING "%s:DEVICE ERR - UNRECOVERABLE DATA LOSS\n", | |
1007 | __FUNCTION__); | |
1008 | dev_kfree_skb_any(skb); | |
1009 | priv->stats.tx_dropped++; | |
1010 | priv->stats.tx_errors++; | |
1011 | priv->stats.tx_carrier_errors++; | |
1012 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
1013 | goto done; | |
1014 | } | |
1015 | ||
1016 | dev->trans_start = jiffies; | |
1017 | if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) { | |
1018 | printk(KERN_WARNING "ctcmpc: %s() DEVICE ERROR" | |
1019 | ": Data Lost \n", | |
1020 | __FUNCTION__); | |
1021 | printk(KERN_WARNING "ctcmpc: %s() DEVICE ERROR" | |
1022 | " - UNRECOVERABLE DATA LOSS\n", | |
1023 | __FUNCTION__); | |
1024 | dev_kfree_skb_any(skb); | |
1025 | priv->stats.tx_dropped++; | |
1026 | priv->stats.tx_errors++; | |
1027 | priv->stats.tx_carrier_errors++; | |
1028 | ctcm_clear_busy(dev); | |
1029 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
1030 | goto done; | |
1031 | } | |
1032 | ctcm_clear_busy(dev); | |
1033 | done: | |
1034 | if (do_debug) | |
1035 | MPC_DBF_DEV_NAME(TRACE, dev, "exit"); | |
1036 | ||
1037 | return 0; /* handle freeing of skb here */ | |
1038 | } | |
1039 | ||
1040 | ||
1041 | /** | |
1042 | * Sets MTU of an interface. | |
1043 | * | |
1044 | * dev Pointer to interface struct. | |
1045 | * new_mtu The new MTU to use for this interface. | |
1046 | * | |
1047 | * returns 0 on success, -EINVAL if MTU is out of valid range. | |
1048 | * (valid range is 576 .. 65527). If VM is on the | |
1049 | * remote side, maximum MTU is 32760, however this is | |
1050 | * not checked here. | |
1051 | */ | |
1052 | static int ctcm_change_mtu(struct net_device *dev, int new_mtu) | |
1053 | { | |
1054 | struct ctcm_priv *priv; | |
1055 | int max_bufsize; | |
1056 | ||
1057 | CTCM_DBF_TEXT(SETUP, CTC_DBF_INFO, __FUNCTION__); | |
1058 | ||
1059 | if (new_mtu < 576 || new_mtu > 65527) | |
1060 | return -EINVAL; | |
1061 | ||
1062 | priv = dev->priv; | |
1063 | max_bufsize = priv->channel[READ]->max_bufsize; | |
1064 | ||
1065 | if (IS_MPC(priv)) { | |
1066 | if (new_mtu > max_bufsize - TH_HEADER_LENGTH) | |
1067 | return -EINVAL; | |
1068 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
1069 | } else { | |
1070 | if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) | |
1071 | return -EINVAL; | |
1072 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
1073 | } | |
1074 | dev->mtu = new_mtu; | |
1075 | return 0; | |
1076 | } | |
1077 | ||
1078 | /** | |
1079 | * Returns interface statistics of a device. | |
1080 | * | |
1081 | * dev Pointer to interface struct. | |
1082 | * | |
1083 | * returns Pointer to stats struct of this interface. | |
1084 | */ | |
1085 | static struct net_device_stats *ctcm_stats(struct net_device *dev) | |
1086 | { | |
1087 | return &((struct ctcm_priv *)dev->priv)->stats; | |
1088 | } | |
1089 | ||
1090 | ||
1091 | static void ctcm_netdev_unregister(struct net_device *dev) | |
1092 | { | |
1093 | CTCM_DBF_TEXT(SETUP, CTC_DBF_INFO, __FUNCTION__); | |
1094 | if (!dev) | |
1095 | return; | |
1096 | unregister_netdev(dev); | |
1097 | } | |
1098 | ||
1099 | static int ctcm_netdev_register(struct net_device *dev) | |
1100 | { | |
1101 | CTCM_DBF_TEXT(SETUP, CTC_DBF_INFO, __FUNCTION__); | |
1102 | return register_netdev(dev); | |
1103 | } | |
1104 | ||
1105 | static void ctcm_free_netdevice(struct net_device *dev) | |
1106 | { | |
1107 | struct ctcm_priv *priv; | |
1108 | struct mpc_group *grp; | |
1109 | ||
1110 | CTCM_DBF_TEXT(SETUP, CTC_DBF_INFO, __FUNCTION__); | |
1111 | ||
1112 | if (!dev) | |
1113 | return; | |
1114 | priv = dev->priv; | |
1115 | if (priv) { | |
1116 | grp = priv->mpcg; | |
1117 | if (grp) { | |
1118 | if (grp->fsm) | |
1119 | kfree_fsm(grp->fsm); | |
1120 | if (grp->xid_skb) | |
1121 | dev_kfree_skb(grp->xid_skb); | |
1122 | if (grp->rcvd_xid_skb) | |
1123 | dev_kfree_skb(grp->rcvd_xid_skb); | |
1124 | tasklet_kill(&grp->mpc_tasklet2); | |
1125 | kfree(grp); | |
1126 | priv->mpcg = NULL; | |
1127 | } | |
1128 | if (priv->fsm) { | |
1129 | kfree_fsm(priv->fsm); | |
1130 | priv->fsm = NULL; | |
1131 | } | |
1132 | kfree(priv->xid); | |
1133 | priv->xid = NULL; | |
1134 | /* | |
1135 | * Note: kfree(priv); is done in "opposite" function of | |
1136 | * allocator function probe_device which is remove_device. | |
1137 | */ | |
1138 | } | |
1139 | #ifdef MODULE | |
1140 | free_netdev(dev); | |
1141 | #endif | |
1142 | } | |
1143 | ||
1144 | struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); | |
1145 | ||
1146 | void static ctcm_dev_setup(struct net_device *dev) | |
1147 | { | |
1148 | dev->open = ctcm_open; | |
1149 | dev->stop = ctcm_close; | |
1150 | dev->get_stats = ctcm_stats; | |
1151 | dev->change_mtu = ctcm_change_mtu; | |
1152 | dev->type = ARPHRD_SLIP; | |
1153 | dev->tx_queue_len = 100; | |
1154 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * Initialize everything of the net device except the name and the | |
1159 | * channel structs. | |
1160 | */ | |
1161 | static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) | |
1162 | { | |
1163 | struct net_device *dev; | |
1164 | struct mpc_group *grp; | |
1165 | if (!priv) | |
1166 | return NULL; | |
1167 | ||
1168 | if (IS_MPC(priv)) | |
1169 | dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); | |
1170 | else | |
1171 | dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); | |
1172 | ||
1173 | if (!dev) { | |
1174 | ctcm_pr_err("%s: Out of memory\n", __FUNCTION__); | |
1175 | return NULL; | |
1176 | } | |
1177 | dev->priv = priv; | |
1178 | priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, | |
1179 | CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, | |
1180 | dev_fsm, dev_fsm_len, GFP_KERNEL); | |
1181 | if (priv->fsm == NULL) { | |
1182 | CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); | |
1183 | kfree(dev); | |
1184 | return NULL; | |
1185 | } | |
1186 | fsm_newstate(priv->fsm, DEV_STATE_STOPPED); | |
1187 | fsm_settimer(priv->fsm, &priv->restart_timer); | |
1188 | ||
1189 | if (IS_MPC(priv)) { | |
1190 | /* MPC Group Initializations */ | |
1191 | grp = ctcmpc_init_mpc_group(priv); | |
1192 | if (grp == NULL) { | |
1193 | MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); | |
1194 | kfree(dev); | |
1195 | return NULL; | |
1196 | } | |
1197 | tasklet_init(&grp->mpc_tasklet2, | |
1198 | mpc_group_ready, (unsigned long)dev); | |
1199 | dev->mtu = MPC_BUFSIZE_DEFAULT - | |
1200 | TH_HEADER_LENGTH - PDU_HEADER_LENGTH; | |
1201 | ||
1202 | dev->hard_start_xmit = ctcmpc_tx; | |
1203 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
1204 | priv->buffer_size = MPC_BUFSIZE_DEFAULT; | |
1205 | } else { | |
1206 | dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | |
1207 | dev->hard_start_xmit = ctcm_tx; | |
1208 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
1209 | } | |
1210 | ||
1211 | CTCMY_DBF_DEV(SETUP, dev, "finished"); | |
1212 | return dev; | |
1213 | } | |
1214 | ||
1215 | /** | |
1216 | * Main IRQ handler. | |
1217 | * | |
1218 | * cdev The ccw_device the interrupt is for. | |
1219 | * intparm interruption parameter. | |
1220 | * irb interruption response block. | |
1221 | */ | |
1222 | static void ctcm_irq_handler(struct ccw_device *cdev, | |
1223 | unsigned long intparm, struct irb *irb) | |
1224 | { | |
1225 | struct channel *ch; | |
1226 | struct net_device *dev; | |
1227 | struct ctcm_priv *priv; | |
1228 | struct ccwgroup_device *cgdev; | |
1229 | ||
1230 | CTCM_DBF_TEXT(TRACE, CTC_DBF_DEBUG, __FUNCTION__); | |
1231 | if (ctcm_check_irb_error(cdev, irb)) | |
1232 | return; | |
1233 | ||
1234 | cgdev = dev_get_drvdata(&cdev->dev); | |
1235 | ||
1236 | /* Check for unsolicited interrupts. */ | |
1237 | if (cgdev == NULL) { | |
1238 | ctcm_pr_warn("ctcm: Got unsolicited irq: %s c-%02x d-%02x\n", | |
23d805b6 PO |
1239 | cdev->dev.bus_id, irb->scsw.cmd.cstat, |
1240 | irb->scsw.cmd.dstat); | |
293d984f PT |
1241 | return; |
1242 | } | |
1243 | ||
1244 | priv = dev_get_drvdata(&cgdev->dev); | |
1245 | ||
1246 | /* Try to extract channel from driver data. */ | |
1247 | if (priv->channel[READ]->cdev == cdev) | |
1248 | ch = priv->channel[READ]; | |
1249 | else if (priv->channel[WRITE]->cdev == cdev) | |
1250 | ch = priv->channel[WRITE]; | |
1251 | else { | |
1252 | ctcm_pr_err("ctcm: Can't determine channel for interrupt, " | |
1253 | "device %s\n", cdev->dev.bus_id); | |
1254 | return; | |
1255 | } | |
1256 | ||
1257 | dev = (struct net_device *)(ch->netdev); | |
1258 | if (dev == NULL) { | |
1259 | ctcm_pr_crit("ctcm: %s dev=NULL bus_id=%s, ch=0x%p\n", | |
1260 | __FUNCTION__, cdev->dev.bus_id, ch); | |
1261 | return; | |
1262 | } | |
1263 | ||
1264 | if (do_debug) | |
1265 | ctcm_pr_debug("%s: interrupt for device: %s " | |
1266 | "received c-%02x d-%02x\n", | |
1267 | dev->name, | |
1268 | ch->id, | |
23d805b6 PO |
1269 | irb->scsw.cmd.cstat, |
1270 | irb->scsw.cmd.dstat); | |
293d984f PT |
1271 | |
1272 | /* Copy interruption response block. */ | |
1273 | memcpy(ch->irb, irb, sizeof(struct irb)); | |
1274 | ||
1275 | /* Check for good subchannel return code, otherwise error message */ | |
23d805b6 | 1276 | if (irb->scsw.cmd.cstat) { |
293d984f PT |
1277 | fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); |
1278 | ctcm_pr_warn("%s: subchannel check for dev: %s - %02x %02x\n", | |
23d805b6 PO |
1279 | dev->name, ch->id, irb->scsw.cmd.cstat, |
1280 | irb->scsw.cmd.dstat); | |
293d984f PT |
1281 | return; |
1282 | } | |
1283 | ||
1284 | /* Check the reason-code of a unit check */ | |
23d805b6 | 1285 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { |
293d984f PT |
1286 | ccw_unit_check(ch, irb->ecw[0]); |
1287 | return; | |
1288 | } | |
23d805b6 PO |
1289 | if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { |
1290 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) | |
293d984f PT |
1291 | fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); |
1292 | else | |
1293 | fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); | |
1294 | return; | |
1295 | } | |
23d805b6 | 1296 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
293d984f PT |
1297 | fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); |
1298 | return; | |
1299 | } | |
23d805b6 PO |
1300 | if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || |
1301 | (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || | |
1302 | (irb->scsw.cmd.stctl == | |
293d984f PT |
1303 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) |
1304 | fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); | |
1305 | else | |
1306 | fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); | |
1307 | ||
1308 | } | |
1309 | ||
1310 | /** | |
1311 | * Add ctcm specific attributes. | |
1312 | * Add ctcm private data. | |
1313 | * | |
1314 | * cgdev pointer to ccwgroup_device just added | |
1315 | * | |
1316 | * returns 0 on success, !0 on failure. | |
1317 | */ | |
1318 | static int ctcm_probe_device(struct ccwgroup_device *cgdev) | |
1319 | { | |
1320 | struct ctcm_priv *priv; | |
1321 | int rc; | |
1322 | ||
1323 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s %p", __FUNCTION__, cgdev); | |
1324 | ||
1325 | if (!get_device(&cgdev->dev)) | |
1326 | return -ENODEV; | |
1327 | ||
1328 | priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); | |
1329 | if (!priv) { | |
1330 | ctcm_pr_err("%s: Out of memory\n", __FUNCTION__); | |
1331 | put_device(&cgdev->dev); | |
1332 | return -ENOMEM; | |
1333 | } | |
1334 | ||
1335 | rc = ctcm_add_files(&cgdev->dev); | |
1336 | if (rc) { | |
1337 | kfree(priv); | |
1338 | put_device(&cgdev->dev); | |
1339 | return rc; | |
1340 | } | |
1341 | priv->buffer_size = CTCM_BUFSIZE_DEFAULT; | |
1342 | cgdev->cdev[0]->handler = ctcm_irq_handler; | |
1343 | cgdev->cdev[1]->handler = ctcm_irq_handler; | |
1344 | dev_set_drvdata(&cgdev->dev, priv); | |
1345 | ||
1346 | return 0; | |
1347 | } | |
1348 | ||
1349 | /** | |
1350 | * Add a new channel to the list of channels. | |
1351 | * Keeps the channel list sorted. | |
1352 | * | |
1353 | * cdev The ccw_device to be added. | |
1354 | * type The type class of the new channel. | |
1355 | * priv Points to the private data of the ccwgroup_device. | |
1356 | * | |
1357 | * returns 0 on success, !0 on error. | |
1358 | */ | |
1359 | static int add_channel(struct ccw_device *cdev, enum channel_types type, | |
1360 | struct ctcm_priv *priv) | |
1361 | { | |
1362 | struct channel **c = &channels; | |
1363 | struct channel *ch; | |
1364 | int ccw_num; | |
1365 | int rc = 0; | |
1366 | ||
1367 | CTCM_DBF_TEXT(TRACE, 2, __FUNCTION__); | |
1368 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); | |
1369 | if (ch == NULL) | |
1370 | goto nomem_return; | |
1371 | ||
1372 | ch->protocol = priv->protocol; | |
1373 | if (IS_MPC(priv)) { | |
1374 | ch->discontact_th = (struct th_header *) | |
1375 | kzalloc(TH_HEADER_LENGTH, gfp_type()); | |
1376 | if (ch->discontact_th == NULL) | |
1377 | goto nomem_return; | |
1378 | ||
1379 | ch->discontact_th->th_blk_flag = TH_DISCONTACT; | |
1380 | tasklet_init(&ch->ch_disc_tasklet, | |
1381 | mpc_action_send_discontact, (unsigned long)ch); | |
1382 | ||
1383 | tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); | |
1384 | ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); | |
1385 | ccw_num = 17; | |
1386 | } else | |
1387 | ccw_num = 8; | |
1388 | ||
1389 | ch->ccw = (struct ccw1 *) | |
1390 | kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); | |
1391 | if (ch->ccw == NULL) | |
1392 | goto nomem_return; | |
1393 | ||
1394 | ch->cdev = cdev; | |
1395 | snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", cdev->dev.bus_id); | |
1396 | ch->type = type; | |
1397 | ||
1398 | /** | |
1399 | * "static" ccws are used in the following way: | |
1400 | * | |
1401 | * ccw[0..2] (Channel program for generic I/O): | |
1402 | * 0: prepare | |
1403 | * 1: read or write (depending on direction) with fixed | |
1404 | * buffer (idal allocated once when buffer is allocated) | |
1405 | * 2: nop | |
1406 | * ccw[3..5] (Channel program for direct write of packets) | |
1407 | * 3: prepare | |
1408 | * 4: write (idal allocated on every write). | |
1409 | * 5: nop | |
1410 | * ccw[6..7] (Channel program for initial channel setup): | |
1411 | * 6: set extended mode | |
1412 | * 7: nop | |
1413 | * | |
1414 | * ch->ccw[0..5] are initialized in ch_action_start because | |
1415 | * the channel's direction is yet unknown here. | |
1416 | * | |
1417 | * ccws used for xid2 negotiations | |
1418 | * ch-ccw[8-14] need to be used for the XID exchange either | |
1419 | * X side XID2 Processing | |
1420 | * 8: write control | |
1421 | * 9: write th | |
1422 | * 10: write XID | |
1423 | * 11: read th from secondary | |
1424 | * 12: read XID from secondary | |
1425 | * 13: read 4 byte ID | |
1426 | * 14: nop | |
1427 | * Y side XID Processing | |
1428 | * 8: sense | |
1429 | * 9: read th | |
1430 | * 10: read XID | |
1431 | * 11: write th | |
1432 | * 12: write XID | |
1433 | * 13: write 4 byte ID | |
1434 | * 14: nop | |
1435 | * | |
1436 | * ccws used for double noop due to VM timing issues | |
1437 | * which result in unrecoverable Busy on channel | |
1438 | * 15: nop | |
1439 | * 16: nop | |
1440 | */ | |
1441 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; | |
1442 | ch->ccw[6].flags = CCW_FLAG_SLI; | |
1443 | ||
1444 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; | |
1445 | ch->ccw[7].flags = CCW_FLAG_SLI; | |
1446 | ||
1447 | if (IS_MPC(priv)) { | |
1448 | ch->ccw[15].cmd_code = CCW_CMD_WRITE; | |
1449 | ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | |
1450 | ch->ccw[15].count = TH_HEADER_LENGTH; | |
1451 | ch->ccw[15].cda = virt_to_phys(ch->discontact_th); | |
1452 | ||
1453 | ch->ccw[16].cmd_code = CCW_CMD_NOOP; | |
1454 | ch->ccw[16].flags = CCW_FLAG_SLI; | |
1455 | ||
1456 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1457 | ctc_ch_event_names, CTC_MPC_NR_STATES, | |
1458 | CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, | |
1459 | mpc_ch_fsm_len, GFP_KERNEL); | |
1460 | } else { | |
1461 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1462 | ctc_ch_event_names, CTC_NR_STATES, | |
1463 | CTC_NR_EVENTS, ch_fsm, | |
1464 | ch_fsm_len, GFP_KERNEL); | |
1465 | } | |
1466 | if (ch->fsm == NULL) | |
1467 | goto free_return; | |
1468 | ||
1469 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
1470 | ||
1471 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); | |
1472 | if (ch->irb == NULL) | |
1473 | goto nomem_return; | |
1474 | ||
1475 | while (*c && ctcm_less_than((*c)->id, ch->id)) | |
1476 | c = &(*c)->next; | |
1477 | ||
1478 | if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { | |
1479 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
1480 | "%s (%s) already in list, using old entry", | |
1481 | __FUNCTION__, (*c)->id); | |
1482 | ||
1483 | goto free_return; | |
1484 | } | |
1485 | ||
1486 | spin_lock_init(&ch->collect_lock); | |
1487 | ||
1488 | fsm_settimer(ch->fsm, &ch->timer); | |
1489 | skb_queue_head_init(&ch->io_queue); | |
1490 | skb_queue_head_init(&ch->collect_queue); | |
1491 | ||
1492 | if (IS_MPC(priv)) { | |
1493 | fsm_settimer(ch->fsm, &ch->sweep_timer); | |
1494 | skb_queue_head_init(&ch->sweep_queue); | |
1495 | } | |
1496 | ch->next = *c; | |
1497 | *c = ch; | |
1498 | return 0; | |
1499 | ||
1500 | nomem_return: | |
1501 | ctcm_pr_warn("ctcm: Out of memory in %s\n", __FUNCTION__); | |
1502 | rc = -ENOMEM; | |
1503 | ||
1504 | free_return: /* note that all channel pointers are 0 or valid */ | |
1505 | kfree(ch->ccw); /* TODO: check that again */ | |
1506 | kfree(ch->discontact_th); | |
1507 | kfree_fsm(ch->fsm); | |
1508 | kfree(ch->irb); | |
1509 | kfree(ch); | |
1510 | return rc; | |
1511 | } | |
1512 | ||
1513 | /* | |
1514 | * Return type of a detected device. | |
1515 | */ | |
1516 | static enum channel_types get_channel_type(struct ccw_device_id *id) | |
1517 | { | |
1518 | enum channel_types type; | |
1519 | type = (enum channel_types)id->driver_info; | |
1520 | ||
1521 | if (type == channel_type_ficon) | |
1522 | type = channel_type_escon; | |
1523 | ||
1524 | return type; | |
1525 | } | |
1526 | ||
1527 | /** | |
1528 | * | |
1529 | * Setup an interface. | |
1530 | * | |
1531 | * cgdev Device to be setup. | |
1532 | * | |
1533 | * returns 0 on success, !0 on failure. | |
1534 | */ | |
1535 | static int ctcm_new_device(struct ccwgroup_device *cgdev) | |
1536 | { | |
1537 | char read_id[CTCM_ID_SIZE]; | |
1538 | char write_id[CTCM_ID_SIZE]; | |
1539 | int direction; | |
1540 | enum channel_types type; | |
1541 | struct ctcm_priv *priv; | |
1542 | struct net_device *dev; | |
1543 | int ret; | |
1544 | ||
1545 | CTCM_DBF_TEXT(SETUP, CTC_DBF_INFO, __FUNCTION__); | |
1546 | ||
1547 | priv = dev_get_drvdata(&cgdev->dev); | |
1548 | if (!priv) | |
1549 | return -ENODEV; | |
1550 | ||
1551 | type = get_channel_type(&cgdev->cdev[0]->id); | |
1552 | ||
1553 | snprintf(read_id, CTCM_ID_SIZE, "ch-%s", cgdev->cdev[0]->dev.bus_id); | |
1554 | snprintf(write_id, CTCM_ID_SIZE, "ch-%s", cgdev->cdev[1]->dev.bus_id); | |
1555 | ||
1556 | ret = add_channel(cgdev->cdev[0], type, priv); | |
1557 | if (ret) | |
1558 | return ret; | |
1559 | ret = add_channel(cgdev->cdev[1], type, priv); | |
1560 | if (ret) | |
1561 | return ret; | |
1562 | ||
1563 | ret = ccw_device_set_online(cgdev->cdev[0]); | |
1564 | if (ret != 0) { | |
1565 | CTCM_DBF_TEXT(SETUP, CTC_DBF_WARN, | |
1566 | "ccw_device_set_online (cdev[0]) failed "); | |
1567 | ctcm_pr_warn("ccw_device_set_online (cdev[0]) failed " | |
1568 | "with ret = %d\n", ret); | |
1569 | } | |
1570 | ||
1571 | ret = ccw_device_set_online(cgdev->cdev[1]); | |
1572 | if (ret != 0) { | |
1573 | CTCM_DBF_TEXT(SETUP, CTC_DBF_WARN, | |
1574 | "ccw_device_set_online (cdev[1]) failed "); | |
1575 | ctcm_pr_warn("ccw_device_set_online (cdev[1]) failed " | |
1576 | "with ret = %d\n", ret); | |
1577 | } | |
1578 | ||
1579 | dev = ctcm_init_netdevice(priv); | |
1580 | ||
1581 | if (dev == NULL) { | |
1582 | ctcm_pr_warn("ctcm_init_netdevice failed\n"); | |
1583 | goto out; | |
1584 | } | |
1585 | ||
1586 | for (direction = READ; direction <= WRITE; direction++) { | |
1587 | priv->channel[direction] = | |
1588 | channel_get(type, direction == READ ? read_id : write_id, | |
1589 | direction); | |
1590 | if (priv->channel[direction] == NULL) { | |
1591 | if (direction == WRITE) | |
1592 | channel_free(priv->channel[READ]); | |
1593 | ctcm_free_netdevice(dev); | |
1594 | goto out; | |
1595 | } | |
1596 | priv->channel[direction]->netdev = dev; | |
1597 | priv->channel[direction]->protocol = priv->protocol; | |
1598 | priv->channel[direction]->max_bufsize = priv->buffer_size; | |
1599 | } | |
1600 | /* sysfs magic */ | |
1601 | SET_NETDEV_DEV(dev, &cgdev->dev); | |
1602 | ||
1603 | if (ctcm_netdev_register(dev) != 0) { | |
1604 | ctcm_free_netdevice(dev); | |
1605 | goto out; | |
1606 | } | |
1607 | ||
1608 | if (ctcm_add_attributes(&cgdev->dev)) { | |
1609 | ctcm_netdev_unregister(dev); | |
1610 | /* dev->priv = NULL; why that ???? */ | |
1611 | ctcm_free_netdevice(dev); | |
1612 | goto out; | |
1613 | } | |
1614 | ||
1615 | strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); | |
1616 | ||
1617 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
1618 | "setup(%s) ok : r/w = %s / %s, proto : %d", | |
1619 | dev->name, priv->channel[READ]->id, | |
1620 | priv->channel[WRITE]->id, priv->protocol); | |
1621 | ||
1622 | return 0; | |
1623 | out: | |
1624 | ccw_device_set_offline(cgdev->cdev[1]); | |
1625 | ccw_device_set_offline(cgdev->cdev[0]); | |
1626 | ||
1627 | return -ENODEV; | |
1628 | } | |
1629 | ||
1630 | /** | |
1631 | * Shutdown an interface. | |
1632 | * | |
1633 | * cgdev Device to be shut down. | |
1634 | * | |
1635 | * returns 0 on success, !0 on failure. | |
1636 | */ | |
1637 | static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) | |
1638 | { | |
1639 | struct ctcm_priv *priv; | |
1640 | struct net_device *dev; | |
1641 | ||
1642 | priv = dev_get_drvdata(&cgdev->dev); | |
1643 | if (!priv) | |
1644 | return -ENODEV; | |
1645 | ||
1646 | if (priv->channel[READ]) { | |
1647 | dev = priv->channel[READ]->netdev; | |
1648 | CTCM_DBF_DEV(SETUP, dev, ""); | |
1649 | /* Close the device */ | |
1650 | ctcm_close(dev); | |
1651 | dev->flags &= ~IFF_RUNNING; | |
1652 | ctcm_remove_attributes(&cgdev->dev); | |
1653 | channel_free(priv->channel[READ]); | |
1654 | } else | |
1655 | dev = NULL; | |
1656 | ||
1657 | if (priv->channel[WRITE]) | |
1658 | channel_free(priv->channel[WRITE]); | |
1659 | ||
1660 | if (dev) { | |
1661 | ctcm_netdev_unregister(dev); | |
1662 | /* dev->priv = NULL; why that ??? */ | |
1663 | ctcm_free_netdevice(dev); | |
1664 | } | |
1665 | ||
1666 | if (priv->fsm) | |
1667 | kfree_fsm(priv->fsm); | |
1668 | ||
1669 | ccw_device_set_offline(cgdev->cdev[1]); | |
1670 | ccw_device_set_offline(cgdev->cdev[0]); | |
1671 | ||
1672 | if (priv->channel[READ]) | |
1673 | channel_remove(priv->channel[READ]); | |
1674 | if (priv->channel[WRITE]) | |
1675 | channel_remove(priv->channel[WRITE]); | |
1676 | priv->channel[READ] = priv->channel[WRITE] = NULL; | |
1677 | ||
1678 | return 0; | |
1679 | ||
1680 | } | |
1681 | ||
1682 | ||
1683 | static void ctcm_remove_device(struct ccwgroup_device *cgdev) | |
1684 | { | |
1685 | struct ctcm_priv *priv; | |
1686 | ||
1687 | CTCM_DBF_TEXT(SETUP, CTC_DBF_ERROR, __FUNCTION__); | |
1688 | ||
1689 | priv = dev_get_drvdata(&cgdev->dev); | |
1690 | if (!priv) | |
1691 | return; | |
1692 | if (cgdev->state == CCWGROUP_ONLINE) | |
1693 | ctcm_shutdown_device(cgdev); | |
1694 | ctcm_remove_files(&cgdev->dev); | |
1695 | dev_set_drvdata(&cgdev->dev, NULL); | |
1696 | kfree(priv); | |
1697 | put_device(&cgdev->dev); | |
1698 | } | |
1699 | ||
1700 | static struct ccwgroup_driver ctcm_group_driver = { | |
1701 | .owner = THIS_MODULE, | |
1702 | .name = CTC_DRIVER_NAME, | |
1703 | .max_slaves = 2, | |
1704 | .driver_id = 0xC3E3C3D4, /* CTCM */ | |
1705 | .probe = ctcm_probe_device, | |
1706 | .remove = ctcm_remove_device, | |
1707 | .set_online = ctcm_new_device, | |
1708 | .set_offline = ctcm_shutdown_device, | |
1709 | }; | |
1710 | ||
1711 | ||
1712 | /* | |
1713 | * Module related routines | |
1714 | */ | |
1715 | ||
1716 | /* | |
1717 | * Prepare to be unloaded. Free IRQ's and release all resources. | |
1718 | * This is called just before this module is unloaded. It is | |
1719 | * not called, if the usage count is !0, so we don't need to check | |
1720 | * for that. | |
1721 | */ | |
1722 | static void __exit ctcm_exit(void) | |
1723 | { | |
1724 | unregister_cu3088_discipline(&ctcm_group_driver); | |
1725 | ctcm_unregister_dbf_views(); | |
1726 | ctcm_pr_info("CTCM driver unloaded\n"); | |
1727 | } | |
1728 | ||
1729 | /* | |
1730 | * Print Banner. | |
1731 | */ | |
1732 | static void print_banner(void) | |
1733 | { | |
1734 | printk(KERN_INFO "CTCM driver initialized\n"); | |
1735 | } | |
1736 | ||
1737 | /** | |
1738 | * Initialize module. | |
1739 | * This is called just after the module is loaded. | |
1740 | * | |
1741 | * returns 0 on success, !0 on error. | |
1742 | */ | |
1743 | static int __init ctcm_init(void) | |
1744 | { | |
1745 | int ret; | |
1746 | ||
1747 | channels = NULL; | |
1748 | ||
1749 | ret = ctcm_register_dbf_views(); | |
1750 | if (ret) { | |
1751 | ctcm_pr_crit("ctcm_init failed with ctcm_register_dbf_views " | |
1752 | "rc = %d\n", ret); | |
1753 | return ret; | |
1754 | } | |
1755 | ret = register_cu3088_discipline(&ctcm_group_driver); | |
1756 | if (ret) { | |
1757 | ctcm_unregister_dbf_views(); | |
1758 | ctcm_pr_crit("ctcm_init failed with register_cu3088_discipline " | |
1759 | "(rc = %d)\n", ret); | |
1760 | return ret; | |
1761 | } | |
1762 | print_banner(); | |
1763 | return ret; | |
1764 | } | |
1765 | ||
1766 | module_init(ctcm_init); | |
1767 | module_exit(ctcm_exit); | |
1768 | ||
1769 | MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); | |
1770 | MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); | |
1771 | MODULE_LICENSE("GPL"); | |
1772 |