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Commit | Line | Data |
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293d984f PT |
1 | /* |
2 | * drivers/s390/net/ctcm_main.c | |
3 | * | |
b8a2d42a | 4 | * Copyright IBM Corp. 2001, 2009 |
293d984f PT |
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 | ||
2a7c6f2c PT |
24 | #define KMSG_COMPONENT "ctcm" |
25 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
26 | ||
293d984f PT |
27 | #include <linux/module.h> |
28 | #include <linux/init.h> | |
29 | #include <linux/kernel.h> | |
30 | #include <linux/slab.h> | |
31 | #include <linux/errno.h> | |
32 | #include <linux/types.h> | |
33 | #include <linux/interrupt.h> | |
34 | #include <linux/timer.h> | |
35 | #include <linux/bitops.h> | |
36 | ||
37 | #include <linux/signal.h> | |
38 | #include <linux/string.h> | |
39 | ||
40 | #include <linux/ip.h> | |
41 | #include <linux/if_arp.h> | |
42 | #include <linux/tcp.h> | |
43 | #include <linux/skbuff.h> | |
44 | #include <linux/ctype.h> | |
45 | #include <net/dst.h> | |
46 | ||
47 | #include <linux/io.h> | |
48 | #include <asm/ccwdev.h> | |
49 | #include <asm/ccwgroup.h> | |
50 | #include <linux/uaccess.h> | |
51 | ||
52 | #include <asm/idals.h> | |
53 | ||
54 | #include "cu3088.h" | |
55 | #include "ctcm_fsms.h" | |
56 | #include "ctcm_main.h" | |
57 | ||
58 | /* Some common global variables */ | |
59 | ||
60 | /* | |
61 | * Linked list of all detected channels. | |
62 | */ | |
63 | struct channel *channels; | |
64 | ||
65 | /** | |
66 | * Unpack a just received skb and hand it over to | |
67 | * upper layers. | |
68 | * | |
69 | * ch The channel where this skb has been received. | |
70 | * pskb The received skb. | |
71 | */ | |
72 | void ctcm_unpack_skb(struct channel *ch, struct sk_buff *pskb) | |
73 | { | |
74 | struct net_device *dev = ch->netdev; | |
261893d3 | 75 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
76 | __u16 len = *((__u16 *) pskb->data); |
77 | ||
78 | skb_put(pskb, 2 + LL_HEADER_LENGTH); | |
79 | skb_pull(pskb, 2); | |
80 | pskb->dev = dev; | |
81 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
82 | while (len > 0) { | |
83 | struct sk_buff *skb; | |
84 | int skblen; | |
85 | struct ll_header *header = (struct ll_header *)pskb->data; | |
86 | ||
87 | skb_pull(pskb, LL_HEADER_LENGTH); | |
88 | if ((ch->protocol == CTCM_PROTO_S390) && | |
89 | (header->type != ETH_P_IP)) { | |
293d984f | 90 | if (!(ch->logflags & LOG_FLAG_ILLEGALPKT)) { |
aa3f2cb6 | 91 | ch->logflags |= LOG_FLAG_ILLEGALPKT; |
293d984f PT |
92 | /* |
93 | * Check packet type only if we stick strictly | |
94 | * to S/390's protocol of OS390. This only | |
95 | * supports IP. Otherwise allow any packet | |
96 | * type. | |
97 | */ | |
aa3f2cb6 PT |
98 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
99 | "%s(%s): Illegal packet type 0x%04x" | |
100 | " - dropping", | |
101 | CTCM_FUNTAIL, dev->name, header->type); | |
293d984f | 102 | } |
293d984f PT |
103 | priv->stats.rx_dropped++; |
104 | priv->stats.rx_frame_errors++; | |
105 | return; | |
106 | } | |
107 | pskb->protocol = ntohs(header->type); | |
fb8585fc RK |
108 | if ((header->length <= LL_HEADER_LENGTH) || |
109 | (len <= LL_HEADER_LENGTH)) { | |
293d984f | 110 | if (!(ch->logflags & LOG_FLAG_ILLEGALSIZE)) { |
aa3f2cb6 PT |
111 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
112 | "%s(%s): Illegal packet size %d(%d,%d)" | |
113 | "- dropping", | |
114 | CTCM_FUNTAIL, dev->name, | |
115 | header->length, dev->mtu, len); | |
293d984f PT |
116 | ch->logflags |= LOG_FLAG_ILLEGALSIZE; |
117 | } | |
118 | ||
119 | priv->stats.rx_dropped++; | |
120 | priv->stats.rx_length_errors++; | |
121 | return; | |
122 | } | |
123 | header->length -= LL_HEADER_LENGTH; | |
124 | len -= LL_HEADER_LENGTH; | |
125 | if ((header->length > skb_tailroom(pskb)) || | |
126 | (header->length > len)) { | |
127 | if (!(ch->logflags & LOG_FLAG_OVERRUN)) { | |
aa3f2cb6 PT |
128 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
129 | "%s(%s): Packet size %d (overrun)" | |
130 | " - dropping", CTCM_FUNTAIL, | |
131 | dev->name, header->length); | |
293d984f PT |
132 | ch->logflags |= LOG_FLAG_OVERRUN; |
133 | } | |
134 | ||
135 | priv->stats.rx_dropped++; | |
136 | priv->stats.rx_length_errors++; | |
137 | return; | |
138 | } | |
139 | skb_put(pskb, header->length); | |
140 | skb_reset_mac_header(pskb); | |
141 | len -= header->length; | |
142 | skb = dev_alloc_skb(pskb->len); | |
143 | if (!skb) { | |
144 | if (!(ch->logflags & LOG_FLAG_NOMEM)) { | |
aa3f2cb6 PT |
145 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
146 | "%s(%s): MEMORY allocation error", | |
147 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
148 | ch->logflags |= LOG_FLAG_NOMEM; |
149 | } | |
150 | priv->stats.rx_dropped++; | |
151 | return; | |
152 | } | |
153 | skb_copy_from_linear_data(pskb, skb_put(skb, pskb->len), | |
154 | pskb->len); | |
155 | skb_reset_mac_header(skb); | |
156 | skb->dev = pskb->dev; | |
157 | skb->protocol = pskb->protocol; | |
158 | pskb->ip_summed = CHECKSUM_UNNECESSARY; | |
159 | skblen = skb->len; | |
160 | /* | |
161 | * reset logflags | |
162 | */ | |
163 | ch->logflags = 0; | |
164 | priv->stats.rx_packets++; | |
165 | priv->stats.rx_bytes += skblen; | |
166 | netif_rx_ni(skb); | |
293d984f PT |
167 | if (len > 0) { |
168 | skb_pull(pskb, header->length); | |
169 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { | |
e2fc8cb4 JF |
170 | CTCM_DBF_DEV_NAME(TRACE, dev, |
171 | "Overrun in ctcm_unpack_skb"); | |
172 | ch->logflags |= LOG_FLAG_OVERRUN; | |
293d984f PT |
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 | { | |
aa3f2cb6 | 187 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); |
293d984f PT |
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 | ||
293d984f PT |
254 | while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) |
255 | ch = ch->next; | |
256 | if (!ch) { | |
aa3f2cb6 PT |
257 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
258 | "%s(%d, %s, %d) not found in channel list\n", | |
293d984f | 259 | CTCM_FUNTAIL, type, id, direction); |
293d984f PT |
260 | } else { |
261 | if (ch->flags & CHANNEL_FLAGS_INUSE) | |
262 | ch = NULL; | |
263 | else { | |
264 | ch->flags |= CHANNEL_FLAGS_INUSE; | |
265 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; | |
266 | ch->flags |= (direction == WRITE) | |
267 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; | |
268 | fsm_newstate(ch->fsm, CTC_STATE_STOPPED); | |
269 | } | |
270 | } | |
271 | return ch; | |
272 | } | |
273 | ||
274 | static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) | |
275 | { | |
276 | if (!IS_ERR(irb)) | |
277 | return 0; | |
278 | ||
aa3f2cb6 PT |
279 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, |
280 | "irb error %ld on device %s\n", | |
2a0217d5 | 281 | PTR_ERR(irb), dev_name(&cdev->dev)); |
293d984f PT |
282 | |
283 | switch (PTR_ERR(irb)) { | |
284 | case -EIO: | |
2a7c6f2c PT |
285 | dev_err(&cdev->dev, |
286 | "An I/O-error occurred on the CTCM device\n"); | |
293d984f PT |
287 | break; |
288 | case -ETIMEDOUT: | |
2a7c6f2c PT |
289 | dev_err(&cdev->dev, |
290 | "An adapter hardware operation timed out\n"); | |
293d984f PT |
291 | break; |
292 | default: | |
2a7c6f2c PT |
293 | dev_err(&cdev->dev, |
294 | "An error occurred on the adapter hardware\n"); | |
293d984f PT |
295 | } |
296 | return PTR_ERR(irb); | |
297 | } | |
298 | ||
299 | ||
300 | /** | |
301 | * Check sense of a unit check. | |
302 | * | |
303 | * ch The channel, the sense code belongs to. | |
304 | * sense The sense code to inspect. | |
305 | */ | |
aa3f2cb6 | 306 | static inline void ccw_unit_check(struct channel *ch, __u8 sense) |
293d984f | 307 | { |
aa3f2cb6 PT |
308 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, |
309 | "%s(%s): %02x", | |
310 | CTCM_FUNTAIL, ch->id, sense); | |
311 | ||
293d984f PT |
312 | if (sense & SNS0_INTERVENTION_REQ) { |
313 | if (sense & 0x01) { | |
aa3f2cb6 | 314 | if (ch->sense_rc != 0x01) { |
2a7c6f2c PT |
315 | pr_notice( |
316 | "%s: The communication peer has " | |
317 | "disconnected\n", ch->id); | |
aa3f2cb6 PT |
318 | ch->sense_rc = 0x01; |
319 | } | |
293d984f PT |
320 | fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); |
321 | } else { | |
aa3f2cb6 | 322 | if (ch->sense_rc != SNS0_INTERVENTION_REQ) { |
2a7c6f2c PT |
323 | pr_notice( |
324 | "%s: The remote operating system is " | |
325 | "not available\n", ch->id); | |
aa3f2cb6 PT |
326 | ch->sense_rc = SNS0_INTERVENTION_REQ; |
327 | } | |
293d984f PT |
328 | fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); |
329 | } | |
330 | } else if (sense & SNS0_EQUIPMENT_CHECK) { | |
331 | if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
332 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
333 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
334 | "%s(%s): remote HW error %02x", | |
335 | CTCM_FUNTAIL, ch->id, sense); | |
336 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
337 | } | |
293d984f PT |
338 | fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); |
339 | } else { | |
aa3f2cb6 PT |
340 | if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { |
341 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
342 | "%s(%s): remote read parity error %02x", | |
343 | CTCM_FUNTAIL, ch->id, sense); | |
344 | ch->sense_rc = SNS0_EQUIPMENT_CHECK; | |
345 | } | |
293d984f PT |
346 | fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); |
347 | } | |
348 | } else if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
349 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
350 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
351 | "%s(%s): BUS OUT error %02x", | |
352 | CTCM_FUNTAIL, ch->id, sense); | |
353 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
354 | } | |
355 | if (sense & 0x04) /* data-streaming timeout */ | |
293d984f | 356 | fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); |
aa3f2cb6 | 357 | else /* Data-transfer parity error */ |
293d984f | 358 | fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); |
293d984f | 359 | } else if (sense & SNS0_CMD_REJECT) { |
aa3f2cb6 PT |
360 | if (ch->sense_rc != SNS0_CMD_REJECT) { |
361 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
362 | "%s(%s): Command rejected", | |
363 | CTCM_FUNTAIL, ch->id); | |
364 | ch->sense_rc = SNS0_CMD_REJECT; | |
365 | } | |
293d984f | 366 | } else if (sense == 0) { |
aa3f2cb6 PT |
367 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
368 | "%s(%s): Unit check ZERO", | |
369 | CTCM_FUNTAIL, ch->id); | |
293d984f PT |
370 | fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); |
371 | } else { | |
aa3f2cb6 PT |
372 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
373 | "%s(%s): Unit check code %02x unknown", | |
374 | CTCM_FUNTAIL, ch->id, sense); | |
293d984f PT |
375 | fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); |
376 | } | |
377 | } | |
378 | ||
379 | int ctcm_ch_alloc_buffer(struct channel *ch) | |
380 | { | |
293d984f PT |
381 | clear_normalized_cda(&ch->ccw[1]); |
382 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); | |
383 | if (ch->trans_skb == NULL) { | |
aa3f2cb6 PT |
384 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
385 | "%s(%s): %s trans_skb allocation error", | |
386 | CTCM_FUNTAIL, ch->id, | |
293d984f PT |
387 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
388 | return -ENOMEM; | |
389 | } | |
390 | ||
391 | ch->ccw[1].count = ch->max_bufsize; | |
392 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { | |
393 | dev_kfree_skb(ch->trans_skb); | |
394 | ch->trans_skb = NULL; | |
aa3f2cb6 PT |
395 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
396 | "%s(%s): %s set norm_cda failed", | |
397 | CTCM_FUNTAIL, ch->id, | |
293d984f PT |
398 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
399 | return -ENOMEM; | |
400 | } | |
401 | ||
402 | ch->ccw[1].count = 0; | |
403 | ch->trans_skb_data = ch->trans_skb->data; | |
404 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; | |
405 | return 0; | |
406 | } | |
407 | ||
408 | /* | |
409 | * Interface API for upper network layers | |
410 | */ | |
411 | ||
412 | /** | |
413 | * Open an interface. | |
414 | * Called from generic network layer when ifconfig up is run. | |
415 | * | |
416 | * dev Pointer to interface struct. | |
417 | * | |
418 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
419 | */ | |
420 | int ctcm_open(struct net_device *dev) | |
421 | { | |
261893d3 | 422 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
423 | |
424 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
425 | if (!IS_MPC(priv)) | |
426 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
427 | return 0; | |
428 | } | |
429 | ||
430 | /** | |
431 | * Close an interface. | |
432 | * Called from generic network layer when ifconfig down is run. | |
433 | * | |
434 | * dev Pointer to interface struct. | |
435 | * | |
436 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
437 | */ | |
438 | int ctcm_close(struct net_device *dev) | |
439 | { | |
261893d3 | 440 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
441 | |
442 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
443 | if (!IS_MPC(priv)) | |
444 | fsm_event(priv->fsm, DEV_EVENT_STOP, dev); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | ||
449 | /** | |
450 | * Transmit a packet. | |
451 | * This is a helper function for ctcm_tx(). | |
452 | * | |
453 | * ch Channel to be used for sending. | |
454 | * skb Pointer to struct sk_buff of packet to send. | |
455 | * The linklevel header has already been set up | |
456 | * by ctcm_tx(). | |
457 | * | |
458 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
459 | */ | |
460 | static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
461 | { | |
462 | unsigned long saveflags; | |
463 | struct ll_header header; | |
464 | int rc = 0; | |
465 | __u16 block_len; | |
466 | int ccw_idx; | |
467 | struct sk_buff *nskb; | |
468 | unsigned long hi; | |
469 | ||
470 | /* we need to acquire the lock for testing the state | |
471 | * otherwise we can have an IRQ changing the state to | |
472 | * TXIDLE after the test but before acquiring the lock. | |
473 | */ | |
474 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
475 | if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { | |
476 | int l = skb->len + LL_HEADER_LENGTH; | |
477 | ||
478 | if (ch->collect_len + l > ch->max_bufsize - 2) { | |
479 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
480 | return -EBUSY; | |
481 | } else { | |
482 | atomic_inc(&skb->users); | |
483 | header.length = l; | |
484 | header.type = skb->protocol; | |
485 | header.unused = 0; | |
486 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | |
487 | LL_HEADER_LENGTH); | |
488 | skb_queue_tail(&ch->collect_queue, skb); | |
489 | ch->collect_len += l; | |
490 | } | |
491 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
492 | goto done; | |
493 | } | |
494 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
495 | /* | |
496 | * Protect skb against beeing free'd by upper | |
497 | * layers. | |
498 | */ | |
499 | atomic_inc(&skb->users); | |
500 | ch->prof.txlen += skb->len; | |
501 | header.length = skb->len + LL_HEADER_LENGTH; | |
502 | header.type = skb->protocol; | |
503 | header.unused = 0; | |
504 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); | |
505 | block_len = skb->len + 2; | |
506 | *((__u16 *)skb_push(skb, 2)) = block_len; | |
507 | ||
508 | /* | |
509 | * IDAL support in CTCM is broken, so we have to | |
510 | * care about skb's above 2G ourselves. | |
511 | */ | |
512 | hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; | |
513 | if (hi) { | |
514 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
515 | if (!nskb) { | |
516 | atomic_dec(&skb->users); | |
517 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
518 | ctcm_clear_busy(ch->netdev); | |
519 | return -ENOMEM; | |
520 | } else { | |
521 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
522 | atomic_inc(&nskb->users); | |
523 | atomic_dec(&skb->users); | |
524 | dev_kfree_skb_irq(skb); | |
525 | skb = nskb; | |
526 | } | |
527 | } | |
528 | ||
529 | ch->ccw[4].count = block_len; | |
530 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
531 | /* | |
532 | * idal allocation failed, try via copying to | |
533 | * trans_skb. trans_skb usually has a pre-allocated | |
534 | * idal. | |
535 | */ | |
536 | if (ctcm_checkalloc_buffer(ch)) { | |
537 | /* | |
538 | * Remove our header. It gets added | |
539 | * again on retransmit. | |
540 | */ | |
541 | atomic_dec(&skb->users); | |
542 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
543 | ctcm_clear_busy(ch->netdev); | |
aa3f2cb6 | 544 | return -ENOMEM; |
293d984f PT |
545 | } |
546 | ||
547 | skb_reset_tail_pointer(ch->trans_skb); | |
548 | ch->trans_skb->len = 0; | |
549 | ch->ccw[1].count = skb->len; | |
550 | skb_copy_from_linear_data(skb, | |
551 | skb_put(ch->trans_skb, skb->len), skb->len); | |
552 | atomic_dec(&skb->users); | |
553 | dev_kfree_skb_irq(skb); | |
554 | ccw_idx = 0; | |
555 | } else { | |
556 | skb_queue_tail(&ch->io_queue, skb); | |
557 | ccw_idx = 3; | |
558 | } | |
559 | ch->retry = 0; | |
560 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
561 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
562 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
563 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
564 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
565 | (unsigned long)ch, 0xff, 0); | |
566 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
567 | if (ccw_idx == 3) | |
568 | ch->prof.doios_single++; | |
569 | if (rc != 0) { | |
570 | fsm_deltimer(&ch->timer); | |
571 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
572 | if (ccw_idx == 3) | |
573 | skb_dequeue_tail(&ch->io_queue); | |
574 | /* | |
575 | * Remove our header. It gets added | |
576 | * again on retransmit. | |
577 | */ | |
578 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
579 | } else if (ccw_idx == 0) { | |
580 | struct net_device *dev = ch->netdev; | |
261893d3 | 581 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
582 | priv->stats.tx_packets++; |
583 | priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | |
584 | } | |
585 | done: | |
586 | ctcm_clear_busy(ch->netdev); | |
587 | return rc; | |
588 | } | |
589 | ||
590 | static void ctcmpc_send_sweep_req(struct channel *rch) | |
591 | { | |
592 | struct net_device *dev = rch->netdev; | |
593 | struct ctcm_priv *priv; | |
594 | struct mpc_group *grp; | |
595 | struct th_sweep *header; | |
596 | struct sk_buff *sweep_skb; | |
597 | struct channel *ch; | |
aa3f2cb6 | 598 | /* int rc = 0; */ |
293d984f | 599 | |
261893d3 | 600 | priv = dev->ml_priv; |
293d984f PT |
601 | grp = priv->mpcg; |
602 | ch = priv->channel[WRITE]; | |
603 | ||
293d984f PT |
604 | /* sweep processing is not complete until response and request */ |
605 | /* has completed for all read channels in group */ | |
606 | if (grp->in_sweep == 0) { | |
607 | grp->in_sweep = 1; | |
608 | grp->sweep_rsp_pend_num = grp->active_channels[READ]; | |
609 | grp->sweep_req_pend_num = grp->active_channels[READ]; | |
610 | } | |
611 | ||
612 | sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); | |
613 | ||
614 | if (sweep_skb == NULL) { | |
aa3f2cb6 PT |
615 | /* rc = -ENOMEM; */ |
616 | goto nomem; | |
293d984f PT |
617 | } |
618 | ||
619 | header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); | |
620 | ||
621 | if (!header) { | |
622 | dev_kfree_skb_any(sweep_skb); | |
aa3f2cb6 PT |
623 | /* rc = -ENOMEM; */ |
624 | goto nomem; | |
293d984f PT |
625 | } |
626 | ||
627 | header->th.th_seg = 0x00 ; | |
628 | header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ | |
629 | header->th.th_blk_flag = 0x00; | |
630 | header->th.th_is_xid = 0x00; | |
631 | header->th.th_seq_num = 0x00; | |
632 | header->sw.th_last_seq = ch->th_seq_num; | |
633 | ||
634 | memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); | |
635 | ||
636 | kfree(header); | |
637 | ||
638 | dev->trans_start = jiffies; | |
639 | skb_queue_tail(&ch->sweep_queue, sweep_skb); | |
640 | ||
641 | fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); | |
642 | ||
643 | return; | |
644 | ||
aa3f2cb6 PT |
645 | nomem: |
646 | grp->in_sweep = 0; | |
647 | ctcm_clear_busy(dev); | |
648 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
293d984f PT |
649 | |
650 | return; | |
651 | } | |
652 | ||
653 | /* | |
654 | * MPC mode version of transmit_skb | |
655 | */ | |
656 | static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
657 | { | |
658 | struct pdu *p_header; | |
659 | struct net_device *dev = ch->netdev; | |
261893d3 | 660 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
661 | struct mpc_group *grp = priv->mpcg; |
662 | struct th_header *header; | |
663 | struct sk_buff *nskb; | |
664 | int rc = 0; | |
665 | int ccw_idx; | |
666 | unsigned long hi; | |
667 | unsigned long saveflags = 0; /* avoids compiler warning */ | |
668 | __u16 block_len; | |
669 | ||
aa3f2cb6 PT |
670 | CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", |
671 | __func__, dev->name, smp_processor_id(), ch, | |
672 | ch->id, fsm_getstate_str(ch->fsm)); | |
293d984f PT |
673 | |
674 | if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { | |
675 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
676 | atomic_inc(&skb->users); | |
677 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
678 | ||
679 | if (!p_header) { | |
293d984f | 680 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
aa3f2cb6 | 681 | goto nomem_exit; |
293d984f PT |
682 | } |
683 | ||
684 | p_header->pdu_offset = skb->len; | |
685 | p_header->pdu_proto = 0x01; | |
686 | p_header->pdu_flag = 0x00; | |
687 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
688 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
689 | } else { | |
690 | p_header->pdu_flag |= PDU_FIRST; | |
691 | } | |
692 | p_header->pdu_seq = 0; | |
693 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, | |
694 | PDU_HEADER_LENGTH); | |
695 | ||
aa3f2cb6 PT |
696 | CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" |
697 | "pdu header and data for up to 32 bytes:\n", | |
698 | __func__, dev->name, skb->len); | |
699 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
700 | |
701 | skb_queue_tail(&ch->collect_queue, skb); | |
702 | ch->collect_len += skb->len; | |
703 | kfree(p_header); | |
704 | ||
705 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
706 | goto done; | |
707 | } | |
708 | ||
709 | /* | |
710 | * Protect skb against beeing free'd by upper | |
711 | * layers. | |
712 | */ | |
713 | atomic_inc(&skb->users); | |
714 | ||
715 | block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
716 | /* | |
717 | * IDAL support in CTCM is broken, so we have to | |
718 | * care about skb's above 2G ourselves. | |
719 | */ | |
720 | hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; | |
721 | if (hi) { | |
722 | nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
723 | if (!nskb) { | |
aa3f2cb6 | 724 | goto nomem_exit; |
293d984f PT |
725 | } else { |
726 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
727 | atomic_inc(&nskb->users); | |
728 | atomic_dec(&skb->users); | |
729 | dev_kfree_skb_irq(skb); | |
730 | skb = nskb; | |
731 | } | |
732 | } | |
733 | ||
734 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
735 | ||
aa3f2cb6 PT |
736 | if (!p_header) |
737 | goto nomem_exit; | |
293d984f PT |
738 | |
739 | p_header->pdu_offset = skb->len; | |
740 | p_header->pdu_proto = 0x01; | |
741 | p_header->pdu_flag = 0x00; | |
742 | p_header->pdu_seq = 0; | |
743 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
744 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
745 | } else { | |
746 | p_header->pdu_flag |= PDU_FIRST; | |
747 | } | |
748 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); | |
749 | ||
750 | kfree(p_header); | |
751 | ||
752 | if (ch->collect_len > 0) { | |
753 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
754 | skb_queue_tail(&ch->collect_queue, skb); | |
755 | ch->collect_len += skb->len; | |
756 | skb = skb_dequeue(&ch->collect_queue); | |
757 | ch->collect_len -= skb->len; | |
758 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
759 | } | |
760 | ||
761 | p_header = (struct pdu *)skb->data; | |
762 | p_header->pdu_flag |= PDU_LAST; | |
763 | ||
764 | ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; | |
765 | ||
766 | header = kmalloc(TH_HEADER_LENGTH, gfp_type()); | |
aa3f2cb6 PT |
767 | if (!header) |
768 | goto nomem_exit; | |
293d984f PT |
769 | |
770 | header->th_seg = 0x00; | |
771 | header->th_ch_flag = TH_HAS_PDU; /* Normal data */ | |
772 | header->th_blk_flag = 0x00; | |
773 | header->th_is_xid = 0x00; /* Just data here */ | |
774 | ch->th_seq_num++; | |
775 | header->th_seq_num = ch->th_seq_num; | |
776 | ||
aa3f2cb6 PT |
777 | CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , |
778 | __func__, dev->name, ch->th_seq_num); | |
293d984f PT |
779 | |
780 | /* put the TH on the packet */ | |
781 | memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); | |
782 | ||
783 | kfree(header); | |
784 | ||
aa3f2cb6 PT |
785 | CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " |
786 | "up to 32 bytes sent to vtam:\n", | |
787 | __func__, dev->name, skb->len); | |
788 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
789 | |
790 | ch->ccw[4].count = skb->len; | |
791 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
792 | /* | |
aa3f2cb6 PT |
793 | * idal allocation failed, try via copying to trans_skb. |
794 | * trans_skb usually has a pre-allocated idal. | |
293d984f PT |
795 | */ |
796 | if (ctcm_checkalloc_buffer(ch)) { | |
797 | /* | |
aa3f2cb6 PT |
798 | * Remove our header. |
799 | * It gets added again on retransmit. | |
293d984f | 800 | */ |
aa3f2cb6 | 801 | goto nomem_exit; |
293d984f PT |
802 | } |
803 | ||
804 | skb_reset_tail_pointer(ch->trans_skb); | |
805 | ch->trans_skb->len = 0; | |
806 | ch->ccw[1].count = skb->len; | |
807 | memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); | |
808 | atomic_dec(&skb->users); | |
809 | dev_kfree_skb_irq(skb); | |
810 | ccw_idx = 0; | |
aa3f2cb6 PT |
811 | CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" |
812 | "up to 32 bytes sent to vtam:\n", | |
813 | __func__, dev->name, ch->trans_skb->len); | |
814 | CTCM_D3_DUMP((char *)ch->trans_skb->data, | |
815 | min_t(int, 32, ch->trans_skb->len)); | |
293d984f PT |
816 | } else { |
817 | skb_queue_tail(&ch->io_queue, skb); | |
818 | ccw_idx = 3; | |
819 | } | |
820 | ch->retry = 0; | |
821 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
822 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
823 | ||
824 | if (do_debug_ccw) | |
825 | ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], | |
826 | sizeof(struct ccw1) * 3); | |
827 | ||
828 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
829 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
830 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
831 | (unsigned long)ch, 0xff, 0); | |
832 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
833 | if (ccw_idx == 3) | |
834 | ch->prof.doios_single++; | |
835 | if (rc != 0) { | |
836 | fsm_deltimer(&ch->timer); | |
837 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
838 | if (ccw_idx == 3) | |
839 | skb_dequeue_tail(&ch->io_queue); | |
840 | } else if (ccw_idx == 0) { | |
841 | priv->stats.tx_packets++; | |
842 | priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; | |
843 | } | |
aa3f2cb6 | 844 | if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ |
293d984f PT |
845 | ctcmpc_send_sweep_req(ch); |
846 | ||
aa3f2cb6 PT |
847 | goto done; |
848 | nomem_exit: | |
849 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, | |
850 | "%s(%s): MEMORY allocation ERROR\n", | |
851 | CTCM_FUNTAIL, ch->id); | |
852 | rc = -ENOMEM; | |
853 | atomic_dec(&skb->users); | |
854 | dev_kfree_skb_any(skb); | |
855 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
293d984f | 856 | done: |
aa3f2cb6 PT |
857 | CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); |
858 | return rc; | |
293d984f PT |
859 | } |
860 | ||
861 | /** | |
862 | * Start transmission of a packet. | |
863 | * Called from generic network device layer. | |
864 | * | |
865 | * skb Pointer to buffer containing the packet. | |
866 | * dev Pointer to interface struct. | |
867 | * | |
868 | * returns 0 if packet consumed, !0 if packet rejected. | |
869 | * Note: If we return !0, then the packet is free'd by | |
870 | * the generic network layer. | |
871 | */ | |
872 | /* first merge version - leaving both functions separated */ | |
873 | static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) | |
874 | { | |
261893d3 | 875 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
876 | |
877 | if (skb == NULL) { | |
aa3f2cb6 PT |
878 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
879 | "%s(%s): NULL sk_buff passed", | |
880 | CTCM_FUNTAIL, dev->name); | |
293d984f | 881 | priv->stats.tx_dropped++; |
6ed10654 | 882 | return NETDEV_TX_OK; |
293d984f PT |
883 | } |
884 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { | |
aa3f2cb6 PT |
885 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
886 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
887 | CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); | |
293d984f PT |
888 | dev_kfree_skb(skb); |
889 | priv->stats.tx_dropped++; | |
6ed10654 | 890 | return NETDEV_TX_OK; |
293d984f PT |
891 | } |
892 | ||
893 | /* | |
894 | * If channels are not running, try to restart them | |
895 | * and throw away packet. | |
896 | */ | |
897 | if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { | |
898 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
899 | dev_kfree_skb(skb); | |
900 | priv->stats.tx_dropped++; | |
901 | priv->stats.tx_errors++; | |
902 | priv->stats.tx_carrier_errors++; | |
6ed10654 | 903 | return NETDEV_TX_OK; |
293d984f PT |
904 | } |
905 | ||
906 | if (ctcm_test_and_set_busy(dev)) | |
3a05d140 | 907 | return NETDEV_TX_BUSY; |
293d984f PT |
908 | |
909 | dev->trans_start = jiffies; | |
910 | if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0) | |
3a05d140 | 911 | return NETDEV_TX_BUSY; |
6ed10654 | 912 | return NETDEV_TX_OK; |
293d984f PT |
913 | } |
914 | ||
915 | /* unmerged MPC variant of ctcm_tx */ | |
916 | static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) | |
917 | { | |
918 | int len = 0; | |
261893d3 | 919 | struct ctcm_priv *priv = dev->ml_priv; |
aa3f2cb6 | 920 | struct mpc_group *grp = priv->mpcg; |
293d984f PT |
921 | struct sk_buff *newskb = NULL; |
922 | ||
293d984f PT |
923 | /* |
924 | * Some sanity checks ... | |
925 | */ | |
926 | if (skb == NULL) { | |
aa3f2cb6 PT |
927 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
928 | "%s(%s): NULL sk_buff passed", | |
929 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
930 | priv->stats.tx_dropped++; |
931 | goto done; | |
932 | } | |
933 | if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { | |
aa3f2cb6 PT |
934 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
935 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
936 | CTCM_FUNTAIL, dev->name, | |
937 | TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
293d984f | 938 | |
aa3f2cb6 | 939 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); |
293d984f PT |
940 | |
941 | len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
942 | newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); | |
943 | ||
944 | if (!newskb) { | |
aa3f2cb6 PT |
945 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
946 | "%s: %s: __dev_alloc_skb failed", | |
947 | __func__, dev->name); | |
293d984f PT |
948 | |
949 | dev_kfree_skb_any(skb); | |
950 | priv->stats.tx_dropped++; | |
951 | priv->stats.tx_errors++; | |
952 | priv->stats.tx_carrier_errors++; | |
953 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
954 | goto done; | |
955 | } | |
956 | newskb->protocol = skb->protocol; | |
957 | skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
958 | memcpy(skb_put(newskb, skb->len), skb->data, skb->len); | |
959 | dev_kfree_skb_any(skb); | |
960 | skb = newskb; | |
961 | } | |
962 | ||
963 | /* | |
964 | * If channels are not running, | |
965 | * notify anybody about a link failure and throw | |
966 | * away packet. | |
967 | */ | |
968 | if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || | |
969 | (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { | |
970 | dev_kfree_skb_any(skb); | |
aa3f2cb6 PT |
971 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
972 | "%s(%s): inactive MPCGROUP - dropped", | |
973 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
974 | priv->stats.tx_dropped++; |
975 | priv->stats.tx_errors++; | |
976 | priv->stats.tx_carrier_errors++; | |
977 | goto done; | |
978 | } | |
979 | ||
980 | if (ctcm_test_and_set_busy(dev)) { | |
aa3f2cb6 PT |
981 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
982 | "%s(%s): device busy - dropped", | |
983 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
984 | dev_kfree_skb_any(skb); |
985 | priv->stats.tx_dropped++; | |
986 | priv->stats.tx_errors++; | |
987 | priv->stats.tx_carrier_errors++; | |
988 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
989 | goto done; | |
990 | } | |
991 | ||
992 | dev->trans_start = jiffies; | |
993 | if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) { | |
aa3f2cb6 PT |
994 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
995 | "%s(%s): device error - dropped", | |
996 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
997 | dev_kfree_skb_any(skb); |
998 | priv->stats.tx_dropped++; | |
999 | priv->stats.tx_errors++; | |
1000 | priv->stats.tx_carrier_errors++; | |
1001 | ctcm_clear_busy(dev); | |
1002 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
1003 | goto done; | |
1004 | } | |
1005 | ctcm_clear_busy(dev); | |
1006 | done: | |
1007 | if (do_debug) | |
1008 | MPC_DBF_DEV_NAME(TRACE, dev, "exit"); | |
1009 | ||
6ed10654 | 1010 | return NETDEV_TX_OK; /* handle freeing of skb here */ |
293d984f PT |
1011 | } |
1012 | ||
1013 | ||
1014 | /** | |
1015 | * Sets MTU of an interface. | |
1016 | * | |
1017 | * dev Pointer to interface struct. | |
1018 | * new_mtu The new MTU to use for this interface. | |
1019 | * | |
1020 | * returns 0 on success, -EINVAL if MTU is out of valid range. | |
1021 | * (valid range is 576 .. 65527). If VM is on the | |
1022 | * remote side, maximum MTU is 32760, however this is | |
1023 | * not checked here. | |
1024 | */ | |
1025 | static int ctcm_change_mtu(struct net_device *dev, int new_mtu) | |
1026 | { | |
1027 | struct ctcm_priv *priv; | |
1028 | int max_bufsize; | |
1029 | ||
293d984f PT |
1030 | if (new_mtu < 576 || new_mtu > 65527) |
1031 | return -EINVAL; | |
1032 | ||
261893d3 | 1033 | priv = dev->ml_priv; |
293d984f PT |
1034 | max_bufsize = priv->channel[READ]->max_bufsize; |
1035 | ||
1036 | if (IS_MPC(priv)) { | |
1037 | if (new_mtu > max_bufsize - TH_HEADER_LENGTH) | |
1038 | return -EINVAL; | |
1039 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
1040 | } else { | |
1041 | if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) | |
1042 | return -EINVAL; | |
1043 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
1044 | } | |
1045 | dev->mtu = new_mtu; | |
1046 | return 0; | |
1047 | } | |
1048 | ||
1049 | /** | |
1050 | * Returns interface statistics of a device. | |
1051 | * | |
1052 | * dev Pointer to interface struct. | |
1053 | * | |
1054 | * returns Pointer to stats struct of this interface. | |
1055 | */ | |
1056 | static struct net_device_stats *ctcm_stats(struct net_device *dev) | |
1057 | { | |
261893d3 | 1058 | return &((struct ctcm_priv *)dev->ml_priv)->stats; |
293d984f PT |
1059 | } |
1060 | ||
293d984f PT |
1061 | static void ctcm_free_netdevice(struct net_device *dev) |
1062 | { | |
1063 | struct ctcm_priv *priv; | |
1064 | struct mpc_group *grp; | |
1065 | ||
aa3f2cb6 PT |
1066 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1067 | "%s(%s)", CTCM_FUNTAIL, dev->name); | |
261893d3 | 1068 | priv = dev->ml_priv; |
293d984f PT |
1069 | if (priv) { |
1070 | grp = priv->mpcg; | |
1071 | if (grp) { | |
1072 | if (grp->fsm) | |
1073 | kfree_fsm(grp->fsm); | |
1074 | if (grp->xid_skb) | |
1075 | dev_kfree_skb(grp->xid_skb); | |
1076 | if (grp->rcvd_xid_skb) | |
1077 | dev_kfree_skb(grp->rcvd_xid_skb); | |
1078 | tasklet_kill(&grp->mpc_tasklet2); | |
1079 | kfree(grp); | |
1080 | priv->mpcg = NULL; | |
1081 | } | |
1082 | if (priv->fsm) { | |
1083 | kfree_fsm(priv->fsm); | |
1084 | priv->fsm = NULL; | |
1085 | } | |
1086 | kfree(priv->xid); | |
1087 | priv->xid = NULL; | |
1088 | /* | |
1089 | * Note: kfree(priv); is done in "opposite" function of | |
1090 | * allocator function probe_device which is remove_device. | |
1091 | */ | |
1092 | } | |
1093 | #ifdef MODULE | |
1094 | free_netdev(dev); | |
1095 | #endif | |
1096 | } | |
1097 | ||
1098 | struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); | |
1099 | ||
69b3aa60 FB |
1100 | static const struct net_device_ops ctcm_netdev_ops = { |
1101 | .ndo_open = ctcm_open, | |
1102 | .ndo_stop = ctcm_close, | |
1103 | .ndo_get_stats = ctcm_stats, | |
1104 | .ndo_change_mtu = ctcm_change_mtu, | |
1105 | .ndo_start_xmit = ctcm_tx, | |
1106 | }; | |
1107 | ||
1108 | static const struct net_device_ops ctcm_mpc_netdev_ops = { | |
1109 | .ndo_open = ctcm_open, | |
1110 | .ndo_stop = ctcm_close, | |
1111 | .ndo_get_stats = ctcm_stats, | |
1112 | .ndo_change_mtu = ctcm_change_mtu, | |
1113 | .ndo_start_xmit = ctcmpc_tx, | |
1114 | }; | |
1115 | ||
293d984f PT |
1116 | void static ctcm_dev_setup(struct net_device *dev) |
1117 | { | |
293d984f PT |
1118 | dev->type = ARPHRD_SLIP; |
1119 | dev->tx_queue_len = 100; | |
1120 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Initialize everything of the net device except the name and the | |
1125 | * channel structs. | |
1126 | */ | |
1127 | static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) | |
1128 | { | |
1129 | struct net_device *dev; | |
1130 | struct mpc_group *grp; | |
1131 | if (!priv) | |
1132 | return NULL; | |
1133 | ||
1134 | if (IS_MPC(priv)) | |
1135 | dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); | |
1136 | else | |
1137 | dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); | |
1138 | ||
1139 | if (!dev) { | |
aa3f2cb6 PT |
1140 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, |
1141 | "%s: MEMORY allocation ERROR", | |
1142 | CTCM_FUNTAIL); | |
293d984f PT |
1143 | return NULL; |
1144 | } | |
261893d3 | 1145 | dev->ml_priv = priv; |
293d984f PT |
1146 | priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, |
1147 | CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, | |
1148 | dev_fsm, dev_fsm_len, GFP_KERNEL); | |
1149 | if (priv->fsm == NULL) { | |
1150 | CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); | |
1151 | kfree(dev); | |
1152 | return NULL; | |
1153 | } | |
1154 | fsm_newstate(priv->fsm, DEV_STATE_STOPPED); | |
1155 | fsm_settimer(priv->fsm, &priv->restart_timer); | |
1156 | ||
1157 | if (IS_MPC(priv)) { | |
1158 | /* MPC Group Initializations */ | |
1159 | grp = ctcmpc_init_mpc_group(priv); | |
1160 | if (grp == NULL) { | |
1161 | MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); | |
1162 | kfree(dev); | |
1163 | return NULL; | |
1164 | } | |
1165 | tasklet_init(&grp->mpc_tasklet2, | |
1166 | mpc_group_ready, (unsigned long)dev); | |
1167 | dev->mtu = MPC_BUFSIZE_DEFAULT - | |
1168 | TH_HEADER_LENGTH - PDU_HEADER_LENGTH; | |
1169 | ||
69b3aa60 | 1170 | dev->netdev_ops = &ctcm_mpc_netdev_ops; |
293d984f PT |
1171 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; |
1172 | priv->buffer_size = MPC_BUFSIZE_DEFAULT; | |
1173 | } else { | |
1174 | dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | |
69b3aa60 | 1175 | dev->netdev_ops = &ctcm_netdev_ops; |
293d984f PT |
1176 | dev->hard_header_len = LL_HEADER_LENGTH + 2; |
1177 | } | |
1178 | ||
1179 | CTCMY_DBF_DEV(SETUP, dev, "finished"); | |
aa3f2cb6 | 1180 | |
293d984f PT |
1181 | return dev; |
1182 | } | |
1183 | ||
1184 | /** | |
1185 | * Main IRQ handler. | |
1186 | * | |
1187 | * cdev The ccw_device the interrupt is for. | |
1188 | * intparm interruption parameter. | |
1189 | * irb interruption response block. | |
1190 | */ | |
1191 | static void ctcm_irq_handler(struct ccw_device *cdev, | |
1192 | unsigned long intparm, struct irb *irb) | |
1193 | { | |
1194 | struct channel *ch; | |
1195 | struct net_device *dev; | |
1196 | struct ctcm_priv *priv; | |
1197 | struct ccwgroup_device *cgdev; | |
aa3f2cb6 PT |
1198 | int cstat; |
1199 | int dstat; | |
1200 | ||
1201 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, | |
2a0217d5 | 1202 | "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); |
293d984f | 1203 | |
293d984f PT |
1204 | if (ctcm_check_irb_error(cdev, irb)) |
1205 | return; | |
1206 | ||
1207 | cgdev = dev_get_drvdata(&cdev->dev); | |
1208 | ||
aa3f2cb6 PT |
1209 | cstat = irb->scsw.cmd.cstat; |
1210 | dstat = irb->scsw.cmd.dstat; | |
1211 | ||
293d984f PT |
1212 | /* Check for unsolicited interrupts. */ |
1213 | if (cgdev == NULL) { | |
2a7c6f2c PT |
1214 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, |
1215 | "%s(%s) unsolicited irq: c-%02x d-%02x\n", | |
1216 | CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); | |
1217 | dev_warn(&cdev->dev, | |
1218 | "The adapter received a non-specific IRQ\n"); | |
293d984f PT |
1219 | return; |
1220 | } | |
1221 | ||
1222 | priv = dev_get_drvdata(&cgdev->dev); | |
1223 | ||
1224 | /* Try to extract channel from driver data. */ | |
1225 | if (priv->channel[READ]->cdev == cdev) | |
1226 | ch = priv->channel[READ]; | |
1227 | else if (priv->channel[WRITE]->cdev == cdev) | |
1228 | ch = priv->channel[WRITE]; | |
1229 | else { | |
2a7c6f2c PT |
1230 | dev_err(&cdev->dev, |
1231 | "%s: Internal error: Can't determine channel for " | |
1232 | "interrupt device %s\n", | |
1233 | __func__, dev_name(&cdev->dev)); | |
1234 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1235 | return; |
1236 | } | |
1237 | ||
aa3f2cb6 | 1238 | dev = ch->netdev; |
293d984f | 1239 | if (dev == NULL) { |
2a7c6f2c PT |
1240 | dev_err(&cdev->dev, |
1241 | "%s Internal error: net_device is NULL, ch = 0x%p\n", | |
1242 | __func__, ch); | |
1243 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1244 | return; |
1245 | } | |
1246 | ||
293d984f PT |
1247 | /* Copy interruption response block. */ |
1248 | memcpy(ch->irb, irb, sizeof(struct irb)); | |
1249 | ||
2a7c6f2c | 1250 | /* Issue error message and return on subchannel error code */ |
23d805b6 | 1251 | if (irb->scsw.cmd.cstat) { |
293d984f | 1252 | fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); |
2a7c6f2c PT |
1253 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
1254 | "%s(%s): sub-ch check %s: cs=%02x ds=%02x", | |
1255 | CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); | |
1256 | dev_warn(&cdev->dev, | |
1257 | "A check occurred on the subchannel\n"); | |
293d984f PT |
1258 | return; |
1259 | } | |
1260 | ||
1261 | /* Check the reason-code of a unit check */ | |
23d805b6 | 1262 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { |
aa3f2cb6 PT |
1263 | if ((irb->ecw[0] & ch->sense_rc) == 0) |
1264 | /* print it only once */ | |
2a7c6f2c | 1265 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
aa3f2cb6 PT |
1266 | "%s(%s): sense=%02x, ds=%02x", |
1267 | CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); | |
293d984f PT |
1268 | ccw_unit_check(ch, irb->ecw[0]); |
1269 | return; | |
1270 | } | |
23d805b6 PO |
1271 | if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { |
1272 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) | |
293d984f PT |
1273 | fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); |
1274 | else | |
1275 | fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); | |
1276 | return; | |
1277 | } | |
23d805b6 | 1278 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
293d984f PT |
1279 | fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); |
1280 | return; | |
1281 | } | |
23d805b6 PO |
1282 | if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || |
1283 | (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || | |
1284 | (irb->scsw.cmd.stctl == | |
293d984f PT |
1285 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) |
1286 | fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); | |
1287 | else | |
1288 | fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); | |
1289 | ||
1290 | } | |
1291 | ||
1292 | /** | |
1293 | * Add ctcm specific attributes. | |
1294 | * Add ctcm private data. | |
1295 | * | |
1296 | * cgdev pointer to ccwgroup_device just added | |
1297 | * | |
1298 | * returns 0 on success, !0 on failure. | |
1299 | */ | |
1300 | static int ctcm_probe_device(struct ccwgroup_device *cgdev) | |
1301 | { | |
1302 | struct ctcm_priv *priv; | |
1303 | int rc; | |
1304 | ||
aa3f2cb6 PT |
1305 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1306 | "%s %p", | |
1307 | __func__, cgdev); | |
293d984f PT |
1308 | |
1309 | if (!get_device(&cgdev->dev)) | |
1310 | return -ENODEV; | |
1311 | ||
1312 | priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); | |
1313 | if (!priv) { | |
aa3f2cb6 PT |
1314 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
1315 | "%s: memory allocation failure", | |
1316 | CTCM_FUNTAIL); | |
293d984f PT |
1317 | put_device(&cgdev->dev); |
1318 | return -ENOMEM; | |
1319 | } | |
1320 | ||
1321 | rc = ctcm_add_files(&cgdev->dev); | |
1322 | if (rc) { | |
1323 | kfree(priv); | |
1324 | put_device(&cgdev->dev); | |
1325 | return rc; | |
1326 | } | |
1327 | priv->buffer_size = CTCM_BUFSIZE_DEFAULT; | |
1328 | cgdev->cdev[0]->handler = ctcm_irq_handler; | |
1329 | cgdev->cdev[1]->handler = ctcm_irq_handler; | |
1330 | dev_set_drvdata(&cgdev->dev, priv); | |
1331 | ||
1332 | return 0; | |
1333 | } | |
1334 | ||
1335 | /** | |
1336 | * Add a new channel to the list of channels. | |
1337 | * Keeps the channel list sorted. | |
1338 | * | |
1339 | * cdev The ccw_device to be added. | |
1340 | * type The type class of the new channel. | |
1341 | * priv Points to the private data of the ccwgroup_device. | |
1342 | * | |
1343 | * returns 0 on success, !0 on error. | |
1344 | */ | |
1345 | static int add_channel(struct ccw_device *cdev, enum channel_types type, | |
1346 | struct ctcm_priv *priv) | |
1347 | { | |
1348 | struct channel **c = &channels; | |
1349 | struct channel *ch; | |
1350 | int ccw_num; | |
1351 | int rc = 0; | |
1352 | ||
aa3f2cb6 PT |
1353 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1354 | "%s(%s), type %d, proto %d", | |
2a0217d5 | 1355 | __func__, dev_name(&cdev->dev), type, priv->protocol); |
aa3f2cb6 | 1356 | |
293d984f PT |
1357 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
1358 | if (ch == NULL) | |
aa3f2cb6 | 1359 | return -ENOMEM; |
293d984f PT |
1360 | |
1361 | ch->protocol = priv->protocol; | |
1362 | if (IS_MPC(priv)) { | |
1363 | ch->discontact_th = (struct th_header *) | |
1364 | kzalloc(TH_HEADER_LENGTH, gfp_type()); | |
1365 | if (ch->discontact_th == NULL) | |
1366 | goto nomem_return; | |
1367 | ||
1368 | ch->discontact_th->th_blk_flag = TH_DISCONTACT; | |
1369 | tasklet_init(&ch->ch_disc_tasklet, | |
1370 | mpc_action_send_discontact, (unsigned long)ch); | |
1371 | ||
1372 | tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); | |
1373 | ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); | |
1374 | ccw_num = 17; | |
1375 | } else | |
1376 | ccw_num = 8; | |
1377 | ||
1378 | ch->ccw = (struct ccw1 *) | |
1379 | kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); | |
1380 | if (ch->ccw == NULL) | |
1381 | goto nomem_return; | |
1382 | ||
1383 | ch->cdev = cdev; | |
2a0217d5 | 1384 | snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); |
293d984f PT |
1385 | ch->type = type; |
1386 | ||
1387 | /** | |
1388 | * "static" ccws are used in the following way: | |
1389 | * | |
1390 | * ccw[0..2] (Channel program for generic I/O): | |
1391 | * 0: prepare | |
1392 | * 1: read or write (depending on direction) with fixed | |
1393 | * buffer (idal allocated once when buffer is allocated) | |
1394 | * 2: nop | |
1395 | * ccw[3..5] (Channel program for direct write of packets) | |
1396 | * 3: prepare | |
1397 | * 4: write (idal allocated on every write). | |
1398 | * 5: nop | |
1399 | * ccw[6..7] (Channel program for initial channel setup): | |
1400 | * 6: set extended mode | |
1401 | * 7: nop | |
1402 | * | |
1403 | * ch->ccw[0..5] are initialized in ch_action_start because | |
1404 | * the channel's direction is yet unknown here. | |
1405 | * | |
1406 | * ccws used for xid2 negotiations | |
1407 | * ch-ccw[8-14] need to be used for the XID exchange either | |
1408 | * X side XID2 Processing | |
1409 | * 8: write control | |
1410 | * 9: write th | |
1411 | * 10: write XID | |
1412 | * 11: read th from secondary | |
1413 | * 12: read XID from secondary | |
1414 | * 13: read 4 byte ID | |
1415 | * 14: nop | |
1416 | * Y side XID Processing | |
1417 | * 8: sense | |
1418 | * 9: read th | |
1419 | * 10: read XID | |
1420 | * 11: write th | |
1421 | * 12: write XID | |
1422 | * 13: write 4 byte ID | |
1423 | * 14: nop | |
1424 | * | |
1425 | * ccws used for double noop due to VM timing issues | |
1426 | * which result in unrecoverable Busy on channel | |
1427 | * 15: nop | |
1428 | * 16: nop | |
1429 | */ | |
1430 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; | |
1431 | ch->ccw[6].flags = CCW_FLAG_SLI; | |
1432 | ||
1433 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; | |
1434 | ch->ccw[7].flags = CCW_FLAG_SLI; | |
1435 | ||
1436 | if (IS_MPC(priv)) { | |
1437 | ch->ccw[15].cmd_code = CCW_CMD_WRITE; | |
1438 | ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | |
1439 | ch->ccw[15].count = TH_HEADER_LENGTH; | |
1440 | ch->ccw[15].cda = virt_to_phys(ch->discontact_th); | |
1441 | ||
1442 | ch->ccw[16].cmd_code = CCW_CMD_NOOP; | |
1443 | ch->ccw[16].flags = CCW_FLAG_SLI; | |
1444 | ||
1445 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1446 | ctc_ch_event_names, CTC_MPC_NR_STATES, | |
1447 | CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, | |
1448 | mpc_ch_fsm_len, GFP_KERNEL); | |
1449 | } else { | |
1450 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1451 | ctc_ch_event_names, CTC_NR_STATES, | |
1452 | CTC_NR_EVENTS, ch_fsm, | |
1453 | ch_fsm_len, GFP_KERNEL); | |
1454 | } | |
1455 | if (ch->fsm == NULL) | |
1456 | goto free_return; | |
1457 | ||
1458 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
1459 | ||
1460 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); | |
1461 | if (ch->irb == NULL) | |
1462 | goto nomem_return; | |
1463 | ||
1464 | while (*c && ctcm_less_than((*c)->id, ch->id)) | |
1465 | c = &(*c)->next; | |
1466 | ||
1467 | if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { | |
1468 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
1469 | "%s (%s) already in list, using old entry", | |
aa3f2cb6 | 1470 | __func__, (*c)->id); |
293d984f PT |
1471 | |
1472 | goto free_return; | |
1473 | } | |
1474 | ||
1475 | spin_lock_init(&ch->collect_lock); | |
1476 | ||
1477 | fsm_settimer(ch->fsm, &ch->timer); | |
1478 | skb_queue_head_init(&ch->io_queue); | |
1479 | skb_queue_head_init(&ch->collect_queue); | |
1480 | ||
1481 | if (IS_MPC(priv)) { | |
1482 | fsm_settimer(ch->fsm, &ch->sweep_timer); | |
1483 | skb_queue_head_init(&ch->sweep_queue); | |
1484 | } | |
1485 | ch->next = *c; | |
1486 | *c = ch; | |
1487 | return 0; | |
1488 | ||
1489 | nomem_return: | |
293d984f PT |
1490 | rc = -ENOMEM; |
1491 | ||
1492 | free_return: /* note that all channel pointers are 0 or valid */ | |
aa3f2cb6 | 1493 | kfree(ch->ccw); |
293d984f PT |
1494 | kfree(ch->discontact_th); |
1495 | kfree_fsm(ch->fsm); | |
1496 | kfree(ch->irb); | |
1497 | kfree(ch); | |
1498 | return rc; | |
1499 | } | |
1500 | ||
1501 | /* | |
1502 | * Return type of a detected device. | |
1503 | */ | |
1504 | static enum channel_types get_channel_type(struct ccw_device_id *id) | |
1505 | { | |
1506 | enum channel_types type; | |
1507 | type = (enum channel_types)id->driver_info; | |
1508 | ||
1509 | if (type == channel_type_ficon) | |
1510 | type = channel_type_escon; | |
1511 | ||
1512 | return type; | |
1513 | } | |
1514 | ||
1515 | /** | |
1516 | * | |
1517 | * Setup an interface. | |
1518 | * | |
1519 | * cgdev Device to be setup. | |
1520 | * | |
1521 | * returns 0 on success, !0 on failure. | |
1522 | */ | |
1523 | static int ctcm_new_device(struct ccwgroup_device *cgdev) | |
1524 | { | |
1525 | char read_id[CTCM_ID_SIZE]; | |
1526 | char write_id[CTCM_ID_SIZE]; | |
1527 | int direction; | |
1528 | enum channel_types type; | |
1529 | struct ctcm_priv *priv; | |
1530 | struct net_device *dev; | |
aa3f2cb6 PT |
1531 | struct ccw_device *cdev0; |
1532 | struct ccw_device *cdev1; | |
293d984f PT |
1533 | int ret; |
1534 | ||
293d984f PT |
1535 | priv = dev_get_drvdata(&cgdev->dev); |
1536 | if (!priv) | |
1537 | return -ENODEV; | |
1538 | ||
aa3f2cb6 PT |
1539 | cdev0 = cgdev->cdev[0]; |
1540 | cdev1 = cgdev->cdev[1]; | |
1541 | ||
1542 | type = get_channel_type(&cdev0->id); | |
293d984f | 1543 | |
b9d3aed7 CH |
1544 | snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); |
1545 | snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); | |
293d984f | 1546 | |
aa3f2cb6 | 1547 | ret = add_channel(cdev0, type, priv); |
293d984f PT |
1548 | if (ret) |
1549 | return ret; | |
aa3f2cb6 | 1550 | ret = add_channel(cdev1, type, priv); |
293d984f PT |
1551 | if (ret) |
1552 | return ret; | |
1553 | ||
aa3f2cb6 | 1554 | ret = ccw_device_set_online(cdev0); |
293d984f | 1555 | if (ret != 0) { |
aa3f2cb6 PT |
1556 | /* may be ok to fail now - can be done later */ |
1557 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, | |
1558 | "%s(%s) set_online rc=%d", | |
1559 | CTCM_FUNTAIL, read_id, ret); | |
293d984f PT |
1560 | } |
1561 | ||
aa3f2cb6 | 1562 | ret = ccw_device_set_online(cdev1); |
293d984f | 1563 | if (ret != 0) { |
aa3f2cb6 PT |
1564 | /* may be ok to fail now - can be done later */ |
1565 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, | |
1566 | "%s(%s) set_online rc=%d", | |
1567 | CTCM_FUNTAIL, write_id, ret); | |
293d984f PT |
1568 | } |
1569 | ||
1570 | dev = ctcm_init_netdevice(priv); | |
aa3f2cb6 PT |
1571 | if (dev == NULL) |
1572 | goto out; | |
293d984f PT |
1573 | |
1574 | for (direction = READ; direction <= WRITE; direction++) { | |
1575 | priv->channel[direction] = | |
1576 | channel_get(type, direction == READ ? read_id : write_id, | |
1577 | direction); | |
1578 | if (priv->channel[direction] == NULL) { | |
1579 | if (direction == WRITE) | |
1580 | channel_free(priv->channel[READ]); | |
aa3f2cb6 | 1581 | goto out_dev; |
293d984f PT |
1582 | } |
1583 | priv->channel[direction]->netdev = dev; | |
1584 | priv->channel[direction]->protocol = priv->protocol; | |
1585 | priv->channel[direction]->max_bufsize = priv->buffer_size; | |
1586 | } | |
1587 | /* sysfs magic */ | |
1588 | SET_NETDEV_DEV(dev, &cgdev->dev); | |
1589 | ||
aa3f2cb6 PT |
1590 | if (register_netdev(dev)) |
1591 | goto out_dev; | |
293d984f PT |
1592 | |
1593 | if (ctcm_add_attributes(&cgdev->dev)) { | |
aa3f2cb6 PT |
1594 | unregister_netdev(dev); |
1595 | goto out_dev; | |
293d984f PT |
1596 | } |
1597 | ||
1598 | strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); | |
1599 | ||
2a7c6f2c PT |
1600 | dev_info(&dev->dev, |
1601 | "setup OK : r/w = %s/%s, protocol : %d\n", | |
1602 | priv->channel[READ]->id, | |
1603 | priv->channel[WRITE]->id, priv->protocol); | |
1604 | ||
293d984f | 1605 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
aa3f2cb6 PT |
1606 | "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, |
1607 | priv->channel[READ]->id, | |
293d984f PT |
1608 | priv->channel[WRITE]->id, priv->protocol); |
1609 | ||
1610 | return 0; | |
aa3f2cb6 PT |
1611 | out_dev: |
1612 | ctcm_free_netdevice(dev); | |
293d984f PT |
1613 | out: |
1614 | ccw_device_set_offline(cgdev->cdev[1]); | |
1615 | ccw_device_set_offline(cgdev->cdev[0]); | |
1616 | ||
1617 | return -ENODEV; | |
1618 | } | |
1619 | ||
1620 | /** | |
1621 | * Shutdown an interface. | |
1622 | * | |
1623 | * cgdev Device to be shut down. | |
1624 | * | |
1625 | * returns 0 on success, !0 on failure. | |
1626 | */ | |
1627 | static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) | |
1628 | { | |
1629 | struct ctcm_priv *priv; | |
1630 | struct net_device *dev; | |
1631 | ||
1632 | priv = dev_get_drvdata(&cgdev->dev); | |
1633 | if (!priv) | |
1634 | return -ENODEV; | |
1635 | ||
1636 | if (priv->channel[READ]) { | |
1637 | dev = priv->channel[READ]->netdev; | |
1638 | CTCM_DBF_DEV(SETUP, dev, ""); | |
1639 | /* Close the device */ | |
1640 | ctcm_close(dev); | |
1641 | dev->flags &= ~IFF_RUNNING; | |
1642 | ctcm_remove_attributes(&cgdev->dev); | |
1643 | channel_free(priv->channel[READ]); | |
1644 | } else | |
1645 | dev = NULL; | |
1646 | ||
1647 | if (priv->channel[WRITE]) | |
1648 | channel_free(priv->channel[WRITE]); | |
1649 | ||
1650 | if (dev) { | |
aa3f2cb6 | 1651 | unregister_netdev(dev); |
293d984f PT |
1652 | ctcm_free_netdevice(dev); |
1653 | } | |
1654 | ||
1655 | if (priv->fsm) | |
1656 | kfree_fsm(priv->fsm); | |
1657 | ||
1658 | ccw_device_set_offline(cgdev->cdev[1]); | |
1659 | ccw_device_set_offline(cgdev->cdev[0]); | |
1660 | ||
1661 | if (priv->channel[READ]) | |
1662 | channel_remove(priv->channel[READ]); | |
1663 | if (priv->channel[WRITE]) | |
1664 | channel_remove(priv->channel[WRITE]); | |
1665 | priv->channel[READ] = priv->channel[WRITE] = NULL; | |
1666 | ||
1667 | return 0; | |
1668 | ||
1669 | } | |
1670 | ||
1671 | ||
1672 | static void ctcm_remove_device(struct ccwgroup_device *cgdev) | |
1673 | { | |
aa3f2cb6 | 1674 | struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); |
293d984f | 1675 | |
aa3f2cb6 PT |
1676 | BUG_ON(priv == NULL); |
1677 | ||
1678 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
8ac6d452 UB |
1679 | "removing device %p, proto : %d", |
1680 | cgdev, priv->protocol); | |
293d984f | 1681 | |
293d984f PT |
1682 | if (cgdev->state == CCWGROUP_ONLINE) |
1683 | ctcm_shutdown_device(cgdev); | |
1684 | ctcm_remove_files(&cgdev->dev); | |
1685 | dev_set_drvdata(&cgdev->dev, NULL); | |
1686 | kfree(priv); | |
1687 | put_device(&cgdev->dev); | |
1688 | } | |
1689 | ||
b8a2d42a FB |
1690 | static int ctcm_pm_suspend(struct ccwgroup_device *gdev) |
1691 | { | |
1692 | struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); | |
1693 | ||
1694 | if (gdev->state == CCWGROUP_OFFLINE) | |
1695 | return 0; | |
1696 | netif_device_detach(priv->channel[READ]->netdev); | |
1697 | ctcm_close(priv->channel[READ]->netdev); | |
1698 | ccw_device_set_offline(gdev->cdev[1]); | |
1699 | ccw_device_set_offline(gdev->cdev[0]); | |
1700 | return 0; | |
1701 | } | |
1702 | ||
1703 | static int ctcm_pm_resume(struct ccwgroup_device *gdev) | |
1704 | { | |
1705 | struct ctcm_priv *priv = dev_get_drvdata(&gdev->dev); | |
1706 | int rc; | |
1707 | ||
1708 | if (gdev->state == CCWGROUP_OFFLINE) | |
1709 | return 0; | |
1710 | rc = ccw_device_set_online(gdev->cdev[1]); | |
1711 | if (rc) | |
1712 | goto err_out; | |
1713 | rc = ccw_device_set_online(gdev->cdev[0]); | |
1714 | if (rc) | |
1715 | goto err_out; | |
1716 | ctcm_open(priv->channel[READ]->netdev); | |
1717 | err_out: | |
1718 | netif_device_attach(priv->channel[READ]->netdev); | |
1719 | return rc; | |
1720 | } | |
1721 | ||
293d984f PT |
1722 | static struct ccwgroup_driver ctcm_group_driver = { |
1723 | .owner = THIS_MODULE, | |
1724 | .name = CTC_DRIVER_NAME, | |
1725 | .max_slaves = 2, | |
1726 | .driver_id = 0xC3E3C3D4, /* CTCM */ | |
1727 | .probe = ctcm_probe_device, | |
1728 | .remove = ctcm_remove_device, | |
1729 | .set_online = ctcm_new_device, | |
1730 | .set_offline = ctcm_shutdown_device, | |
b8a2d42a FB |
1731 | .freeze = ctcm_pm_suspend, |
1732 | .thaw = ctcm_pm_resume, | |
1733 | .restore = ctcm_pm_resume, | |
293d984f PT |
1734 | }; |
1735 | ||
1736 | ||
1737 | /* | |
1738 | * Module related routines | |
1739 | */ | |
1740 | ||
1741 | /* | |
1742 | * Prepare to be unloaded. Free IRQ's and release all resources. | |
1743 | * This is called just before this module is unloaded. It is | |
1744 | * not called, if the usage count is !0, so we don't need to check | |
1745 | * for that. | |
1746 | */ | |
1747 | static void __exit ctcm_exit(void) | |
1748 | { | |
1749 | unregister_cu3088_discipline(&ctcm_group_driver); | |
1750 | ctcm_unregister_dbf_views(); | |
2a7c6f2c | 1751 | pr_info("CTCM driver unloaded\n"); |
293d984f PT |
1752 | } |
1753 | ||
1754 | /* | |
1755 | * Print Banner. | |
1756 | */ | |
1757 | static void print_banner(void) | |
1758 | { | |
2a7c6f2c | 1759 | pr_info("CTCM driver initialized\n"); |
293d984f PT |
1760 | } |
1761 | ||
1762 | /** | |
1763 | * Initialize module. | |
1764 | * This is called just after the module is loaded. | |
1765 | * | |
1766 | * returns 0 on success, !0 on error. | |
1767 | */ | |
1768 | static int __init ctcm_init(void) | |
1769 | { | |
1770 | int ret; | |
1771 | ||
1772 | channels = NULL; | |
1773 | ||
1774 | ret = ctcm_register_dbf_views(); | |
1775 | if (ret) { | |
293d984f PT |
1776 | return ret; |
1777 | } | |
1778 | ret = register_cu3088_discipline(&ctcm_group_driver); | |
1779 | if (ret) { | |
1780 | ctcm_unregister_dbf_views(); | |
2a7c6f2c PT |
1781 | pr_err("%s / register_cu3088_discipline failed, ret = %d\n", |
1782 | __func__, ret); | |
293d984f PT |
1783 | return ret; |
1784 | } | |
1785 | print_banner(); | |
1786 | return ret; | |
1787 | } | |
1788 | ||
1789 | module_init(ctcm_init); | |
1790 | module_exit(ctcm_exit); | |
1791 | ||
1792 | MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); | |
1793 | MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); | |
1794 | MODULE_LICENSE("GPL"); | |
1795 |