Commit | Line | Data |
---|---|---|
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 | ||
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); | |
167 | dev->last_rx = jiffies; | |
168 | if (len > 0) { | |
169 | skb_pull(pskb, header->length); | |
170 | if (skb_tailroom(pskb) < LL_HEADER_LENGTH) { | |
e2fc8cb4 JF |
171 | CTCM_DBF_DEV_NAME(TRACE, dev, |
172 | "Overrun in ctcm_unpack_skb"); | |
173 | ch->logflags |= LOG_FLAG_OVERRUN; | |
293d984f PT |
174 | return; |
175 | } | |
176 | skb_put(pskb, LL_HEADER_LENGTH); | |
177 | } | |
178 | } | |
179 | } | |
180 | ||
181 | /** | |
182 | * Release a specific channel in the channel list. | |
183 | * | |
184 | * ch Pointer to channel struct to be released. | |
185 | */ | |
186 | static void channel_free(struct channel *ch) | |
187 | { | |
aa3f2cb6 | 188 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s)", CTCM_FUNTAIL, ch->id); |
293d984f PT |
189 | ch->flags &= ~CHANNEL_FLAGS_INUSE; |
190 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
191 | } | |
192 | ||
193 | /** | |
194 | * Remove a specific channel in the channel list. | |
195 | * | |
196 | * ch Pointer to channel struct to be released. | |
197 | */ | |
198 | static void channel_remove(struct channel *ch) | |
199 | { | |
200 | struct channel **c = &channels; | |
201 | char chid[CTCM_ID_SIZE+1]; | |
202 | int ok = 0; | |
203 | ||
204 | if (ch == NULL) | |
205 | return; | |
206 | else | |
207 | strncpy(chid, ch->id, CTCM_ID_SIZE); | |
208 | ||
209 | channel_free(ch); | |
210 | while (*c) { | |
211 | if (*c == ch) { | |
212 | *c = ch->next; | |
213 | fsm_deltimer(&ch->timer); | |
214 | if (IS_MPC(ch)) | |
215 | fsm_deltimer(&ch->sweep_timer); | |
216 | ||
217 | kfree_fsm(ch->fsm); | |
218 | clear_normalized_cda(&ch->ccw[4]); | |
219 | if (ch->trans_skb != NULL) { | |
220 | clear_normalized_cda(&ch->ccw[1]); | |
221 | dev_kfree_skb_any(ch->trans_skb); | |
222 | } | |
223 | if (IS_MPC(ch)) { | |
224 | tasklet_kill(&ch->ch_tasklet); | |
225 | tasklet_kill(&ch->ch_disc_tasklet); | |
226 | kfree(ch->discontact_th); | |
227 | } | |
228 | kfree(ch->ccw); | |
229 | kfree(ch->irb); | |
230 | kfree(ch); | |
231 | ok = 1; | |
232 | break; | |
233 | } | |
234 | c = &((*c)->next); | |
235 | } | |
236 | ||
237 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, "%s(%s) %s", CTCM_FUNTAIL, | |
238 | chid, ok ? "OK" : "failed"); | |
239 | } | |
240 | ||
241 | /** | |
242 | * Get a specific channel from the channel list. | |
243 | * | |
244 | * type Type of channel we are interested in. | |
245 | * id Id of channel we are interested in. | |
246 | * direction Direction we want to use this channel for. | |
247 | * | |
248 | * returns Pointer to a channel or NULL if no matching channel available. | |
249 | */ | |
250 | static struct channel *channel_get(enum channel_types type, | |
251 | char *id, int direction) | |
252 | { | |
253 | struct channel *ch = channels; | |
254 | ||
293d984f PT |
255 | while (ch && (strncmp(ch->id, id, CTCM_ID_SIZE) || (ch->type != type))) |
256 | ch = ch->next; | |
257 | if (!ch) { | |
aa3f2cb6 PT |
258 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
259 | "%s(%d, %s, %d) not found in channel list\n", | |
293d984f | 260 | CTCM_FUNTAIL, type, id, direction); |
293d984f PT |
261 | } else { |
262 | if (ch->flags & CHANNEL_FLAGS_INUSE) | |
263 | ch = NULL; | |
264 | else { | |
265 | ch->flags |= CHANNEL_FLAGS_INUSE; | |
266 | ch->flags &= ~CHANNEL_FLAGS_RWMASK; | |
267 | ch->flags |= (direction == WRITE) | |
268 | ? CHANNEL_FLAGS_WRITE : CHANNEL_FLAGS_READ; | |
269 | fsm_newstate(ch->fsm, CTC_STATE_STOPPED); | |
270 | } | |
271 | } | |
272 | return ch; | |
273 | } | |
274 | ||
275 | static long ctcm_check_irb_error(struct ccw_device *cdev, struct irb *irb) | |
276 | { | |
277 | if (!IS_ERR(irb)) | |
278 | return 0; | |
279 | ||
aa3f2cb6 PT |
280 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_WARN, |
281 | "irb error %ld on device %s\n", | |
2a0217d5 | 282 | PTR_ERR(irb), dev_name(&cdev->dev)); |
293d984f PT |
283 | |
284 | switch (PTR_ERR(irb)) { | |
285 | case -EIO: | |
2a7c6f2c PT |
286 | dev_err(&cdev->dev, |
287 | "An I/O-error occurred on the CTCM device\n"); | |
293d984f PT |
288 | break; |
289 | case -ETIMEDOUT: | |
2a7c6f2c PT |
290 | dev_err(&cdev->dev, |
291 | "An adapter hardware operation timed out\n"); | |
293d984f PT |
292 | break; |
293 | default: | |
2a7c6f2c PT |
294 | dev_err(&cdev->dev, |
295 | "An error occurred on the adapter hardware\n"); | |
293d984f PT |
296 | } |
297 | return PTR_ERR(irb); | |
298 | } | |
299 | ||
300 | ||
301 | /** | |
302 | * Check sense of a unit check. | |
303 | * | |
304 | * ch The channel, the sense code belongs to. | |
305 | * sense The sense code to inspect. | |
306 | */ | |
aa3f2cb6 | 307 | static inline void ccw_unit_check(struct channel *ch, __u8 sense) |
293d984f | 308 | { |
aa3f2cb6 PT |
309 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, |
310 | "%s(%s): %02x", | |
311 | CTCM_FUNTAIL, ch->id, sense); | |
312 | ||
293d984f PT |
313 | if (sense & SNS0_INTERVENTION_REQ) { |
314 | if (sense & 0x01) { | |
aa3f2cb6 | 315 | if (ch->sense_rc != 0x01) { |
2a7c6f2c PT |
316 | pr_notice( |
317 | "%s: The communication peer has " | |
318 | "disconnected\n", ch->id); | |
aa3f2cb6 PT |
319 | ch->sense_rc = 0x01; |
320 | } | |
293d984f PT |
321 | fsm_event(ch->fsm, CTC_EVENT_UC_RCRESET, ch); |
322 | } else { | |
aa3f2cb6 | 323 | if (ch->sense_rc != SNS0_INTERVENTION_REQ) { |
2a7c6f2c PT |
324 | pr_notice( |
325 | "%s: The remote operating system is " | |
326 | "not available\n", ch->id); | |
aa3f2cb6 PT |
327 | ch->sense_rc = SNS0_INTERVENTION_REQ; |
328 | } | |
293d984f PT |
329 | fsm_event(ch->fsm, CTC_EVENT_UC_RSRESET, ch); |
330 | } | |
331 | } else if (sense & SNS0_EQUIPMENT_CHECK) { | |
332 | if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
333 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
334 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
335 | "%s(%s): remote HW error %02x", | |
336 | CTCM_FUNTAIL, ch->id, sense); | |
337 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
338 | } | |
293d984f PT |
339 | fsm_event(ch->fsm, CTC_EVENT_UC_HWFAIL, ch); |
340 | } else { | |
aa3f2cb6 PT |
341 | if (ch->sense_rc != SNS0_EQUIPMENT_CHECK) { |
342 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
343 | "%s(%s): remote read parity error %02x", | |
344 | CTCM_FUNTAIL, ch->id, sense); | |
345 | ch->sense_rc = SNS0_EQUIPMENT_CHECK; | |
346 | } | |
293d984f PT |
347 | fsm_event(ch->fsm, CTC_EVENT_UC_RXPARITY, ch); |
348 | } | |
349 | } else if (sense & SNS0_BUS_OUT_CHECK) { | |
aa3f2cb6 PT |
350 | if (ch->sense_rc != SNS0_BUS_OUT_CHECK) { |
351 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
352 | "%s(%s): BUS OUT error %02x", | |
353 | CTCM_FUNTAIL, ch->id, sense); | |
354 | ch->sense_rc = SNS0_BUS_OUT_CHECK; | |
355 | } | |
356 | if (sense & 0x04) /* data-streaming timeout */ | |
293d984f | 357 | fsm_event(ch->fsm, CTC_EVENT_UC_TXTIMEOUT, ch); |
aa3f2cb6 | 358 | else /* Data-transfer parity error */ |
293d984f | 359 | fsm_event(ch->fsm, CTC_EVENT_UC_TXPARITY, ch); |
293d984f | 360 | } else if (sense & SNS0_CMD_REJECT) { |
aa3f2cb6 PT |
361 | if (ch->sense_rc != SNS0_CMD_REJECT) { |
362 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, | |
363 | "%s(%s): Command rejected", | |
364 | CTCM_FUNTAIL, ch->id); | |
365 | ch->sense_rc = SNS0_CMD_REJECT; | |
366 | } | |
293d984f | 367 | } else if (sense == 0) { |
aa3f2cb6 PT |
368 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
369 | "%s(%s): Unit check ZERO", | |
370 | CTCM_FUNTAIL, ch->id); | |
293d984f PT |
371 | fsm_event(ch->fsm, CTC_EVENT_UC_ZERO, ch); |
372 | } else { | |
aa3f2cb6 PT |
373 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
374 | "%s(%s): Unit check code %02x unknown", | |
375 | CTCM_FUNTAIL, ch->id, sense); | |
293d984f PT |
376 | fsm_event(ch->fsm, CTC_EVENT_UC_UNKNOWN, ch); |
377 | } | |
378 | } | |
379 | ||
380 | int ctcm_ch_alloc_buffer(struct channel *ch) | |
381 | { | |
293d984f PT |
382 | clear_normalized_cda(&ch->ccw[1]); |
383 | ch->trans_skb = __dev_alloc_skb(ch->max_bufsize, GFP_ATOMIC | GFP_DMA); | |
384 | if (ch->trans_skb == NULL) { | |
aa3f2cb6 PT |
385 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
386 | "%s(%s): %s trans_skb allocation error", | |
387 | CTCM_FUNTAIL, ch->id, | |
293d984f PT |
388 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
389 | return -ENOMEM; | |
390 | } | |
391 | ||
392 | ch->ccw[1].count = ch->max_bufsize; | |
393 | if (set_normalized_cda(&ch->ccw[1], ch->trans_skb->data)) { | |
394 | dev_kfree_skb(ch->trans_skb); | |
395 | ch->trans_skb = NULL; | |
aa3f2cb6 PT |
396 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
397 | "%s(%s): %s set norm_cda failed", | |
398 | CTCM_FUNTAIL, ch->id, | |
293d984f PT |
399 | (CHANNEL_DIRECTION(ch->flags) == READ) ? "RX" : "TX"); |
400 | return -ENOMEM; | |
401 | } | |
402 | ||
403 | ch->ccw[1].count = 0; | |
404 | ch->trans_skb_data = ch->trans_skb->data; | |
405 | ch->flags &= ~CHANNEL_FLAGS_BUFSIZE_CHANGED; | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Interface API for upper network layers | |
411 | */ | |
412 | ||
413 | /** | |
414 | * Open an interface. | |
415 | * Called from generic network layer when ifconfig up is run. | |
416 | * | |
417 | * dev Pointer to interface struct. | |
418 | * | |
419 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
420 | */ | |
421 | int ctcm_open(struct net_device *dev) | |
422 | { | |
261893d3 | 423 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
424 | |
425 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
426 | if (!IS_MPC(priv)) | |
427 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
428 | return 0; | |
429 | } | |
430 | ||
431 | /** | |
432 | * Close an interface. | |
433 | * Called from generic network layer when ifconfig down is run. | |
434 | * | |
435 | * dev Pointer to interface struct. | |
436 | * | |
437 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
438 | */ | |
439 | int ctcm_close(struct net_device *dev) | |
440 | { | |
261893d3 | 441 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
442 | |
443 | CTCMY_DBF_DEV_NAME(SETUP, dev, ""); | |
444 | if (!IS_MPC(priv)) | |
445 | fsm_event(priv->fsm, DEV_EVENT_STOP, dev); | |
446 | return 0; | |
447 | } | |
448 | ||
449 | ||
450 | /** | |
451 | * Transmit a packet. | |
452 | * This is a helper function for ctcm_tx(). | |
453 | * | |
454 | * ch Channel to be used for sending. | |
455 | * skb Pointer to struct sk_buff of packet to send. | |
456 | * The linklevel header has already been set up | |
457 | * by ctcm_tx(). | |
458 | * | |
459 | * returns 0 on success, -ERRNO on failure. (Never fails.) | |
460 | */ | |
461 | static int ctcm_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
462 | { | |
463 | unsigned long saveflags; | |
464 | struct ll_header header; | |
465 | int rc = 0; | |
466 | __u16 block_len; | |
467 | int ccw_idx; | |
468 | struct sk_buff *nskb; | |
469 | unsigned long hi; | |
470 | ||
471 | /* we need to acquire the lock for testing the state | |
472 | * otherwise we can have an IRQ changing the state to | |
473 | * TXIDLE after the test but before acquiring the lock. | |
474 | */ | |
475 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
476 | if (fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) { | |
477 | int l = skb->len + LL_HEADER_LENGTH; | |
478 | ||
479 | if (ch->collect_len + l > ch->max_bufsize - 2) { | |
480 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
481 | return -EBUSY; | |
482 | } else { | |
483 | atomic_inc(&skb->users); | |
484 | header.length = l; | |
485 | header.type = skb->protocol; | |
486 | header.unused = 0; | |
487 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, | |
488 | LL_HEADER_LENGTH); | |
489 | skb_queue_tail(&ch->collect_queue, skb); | |
490 | ch->collect_len += l; | |
491 | } | |
492 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
493 | goto done; | |
494 | } | |
495 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
496 | /* | |
497 | * Protect skb against beeing free'd by upper | |
498 | * layers. | |
499 | */ | |
500 | atomic_inc(&skb->users); | |
501 | ch->prof.txlen += skb->len; | |
502 | header.length = skb->len + LL_HEADER_LENGTH; | |
503 | header.type = skb->protocol; | |
504 | header.unused = 0; | |
505 | memcpy(skb_push(skb, LL_HEADER_LENGTH), &header, LL_HEADER_LENGTH); | |
506 | block_len = skb->len + 2; | |
507 | *((__u16 *)skb_push(skb, 2)) = block_len; | |
508 | ||
509 | /* | |
510 | * IDAL support in CTCM is broken, so we have to | |
511 | * care about skb's above 2G ourselves. | |
512 | */ | |
513 | hi = ((unsigned long)skb_tail_pointer(skb) + LL_HEADER_LENGTH) >> 31; | |
514 | if (hi) { | |
515 | nskb = alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
516 | if (!nskb) { | |
517 | atomic_dec(&skb->users); | |
518 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
519 | ctcm_clear_busy(ch->netdev); | |
520 | return -ENOMEM; | |
521 | } else { | |
522 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
523 | atomic_inc(&nskb->users); | |
524 | atomic_dec(&skb->users); | |
525 | dev_kfree_skb_irq(skb); | |
526 | skb = nskb; | |
527 | } | |
528 | } | |
529 | ||
530 | ch->ccw[4].count = block_len; | |
531 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
532 | /* | |
533 | * idal allocation failed, try via copying to | |
534 | * trans_skb. trans_skb usually has a pre-allocated | |
535 | * idal. | |
536 | */ | |
537 | if (ctcm_checkalloc_buffer(ch)) { | |
538 | /* | |
539 | * Remove our header. It gets added | |
540 | * again on retransmit. | |
541 | */ | |
542 | atomic_dec(&skb->users); | |
543 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
544 | ctcm_clear_busy(ch->netdev); | |
aa3f2cb6 | 545 | return -ENOMEM; |
293d984f PT |
546 | } |
547 | ||
548 | skb_reset_tail_pointer(ch->trans_skb); | |
549 | ch->trans_skb->len = 0; | |
550 | ch->ccw[1].count = skb->len; | |
551 | skb_copy_from_linear_data(skb, | |
552 | skb_put(ch->trans_skb, skb->len), skb->len); | |
553 | atomic_dec(&skb->users); | |
554 | dev_kfree_skb_irq(skb); | |
555 | ccw_idx = 0; | |
556 | } else { | |
557 | skb_queue_tail(&ch->io_queue, skb); | |
558 | ccw_idx = 3; | |
559 | } | |
560 | ch->retry = 0; | |
561 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
562 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
563 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
564 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
565 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
566 | (unsigned long)ch, 0xff, 0); | |
567 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
568 | if (ccw_idx == 3) | |
569 | ch->prof.doios_single++; | |
570 | if (rc != 0) { | |
571 | fsm_deltimer(&ch->timer); | |
572 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
573 | if (ccw_idx == 3) | |
574 | skb_dequeue_tail(&ch->io_queue); | |
575 | /* | |
576 | * Remove our header. It gets added | |
577 | * again on retransmit. | |
578 | */ | |
579 | skb_pull(skb, LL_HEADER_LENGTH + 2); | |
580 | } else if (ccw_idx == 0) { | |
581 | struct net_device *dev = ch->netdev; | |
261893d3 | 582 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
583 | priv->stats.tx_packets++; |
584 | priv->stats.tx_bytes += skb->len - LL_HEADER_LENGTH; | |
585 | } | |
586 | done: | |
587 | ctcm_clear_busy(ch->netdev); | |
588 | return rc; | |
589 | } | |
590 | ||
591 | static void ctcmpc_send_sweep_req(struct channel *rch) | |
592 | { | |
593 | struct net_device *dev = rch->netdev; | |
594 | struct ctcm_priv *priv; | |
595 | struct mpc_group *grp; | |
596 | struct th_sweep *header; | |
597 | struct sk_buff *sweep_skb; | |
598 | struct channel *ch; | |
aa3f2cb6 | 599 | /* int rc = 0; */ |
293d984f | 600 | |
261893d3 | 601 | priv = dev->ml_priv; |
293d984f PT |
602 | grp = priv->mpcg; |
603 | ch = priv->channel[WRITE]; | |
604 | ||
293d984f PT |
605 | /* sweep processing is not complete until response and request */ |
606 | /* has completed for all read channels in group */ | |
607 | if (grp->in_sweep == 0) { | |
608 | grp->in_sweep = 1; | |
609 | grp->sweep_rsp_pend_num = grp->active_channels[READ]; | |
610 | grp->sweep_req_pend_num = grp->active_channels[READ]; | |
611 | } | |
612 | ||
613 | sweep_skb = __dev_alloc_skb(MPC_BUFSIZE_DEFAULT, GFP_ATOMIC|GFP_DMA); | |
614 | ||
615 | if (sweep_skb == NULL) { | |
aa3f2cb6 PT |
616 | /* rc = -ENOMEM; */ |
617 | goto nomem; | |
293d984f PT |
618 | } |
619 | ||
620 | header = kmalloc(TH_SWEEP_LENGTH, gfp_type()); | |
621 | ||
622 | if (!header) { | |
623 | dev_kfree_skb_any(sweep_skb); | |
aa3f2cb6 PT |
624 | /* rc = -ENOMEM; */ |
625 | goto nomem; | |
293d984f PT |
626 | } |
627 | ||
628 | header->th.th_seg = 0x00 ; | |
629 | header->th.th_ch_flag = TH_SWEEP_REQ; /* 0x0f */ | |
630 | header->th.th_blk_flag = 0x00; | |
631 | header->th.th_is_xid = 0x00; | |
632 | header->th.th_seq_num = 0x00; | |
633 | header->sw.th_last_seq = ch->th_seq_num; | |
634 | ||
635 | memcpy(skb_put(sweep_skb, TH_SWEEP_LENGTH), header, TH_SWEEP_LENGTH); | |
636 | ||
637 | kfree(header); | |
638 | ||
639 | dev->trans_start = jiffies; | |
640 | skb_queue_tail(&ch->sweep_queue, sweep_skb); | |
641 | ||
642 | fsm_addtimer(&ch->sweep_timer, 100, CTC_EVENT_RSWEEP_TIMER, ch); | |
643 | ||
644 | return; | |
645 | ||
aa3f2cb6 PT |
646 | nomem: |
647 | grp->in_sweep = 0; | |
648 | ctcm_clear_busy(dev); | |
649 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
293d984f PT |
650 | |
651 | return; | |
652 | } | |
653 | ||
654 | /* | |
655 | * MPC mode version of transmit_skb | |
656 | */ | |
657 | static int ctcmpc_transmit_skb(struct channel *ch, struct sk_buff *skb) | |
658 | { | |
659 | struct pdu *p_header; | |
660 | struct net_device *dev = ch->netdev; | |
261893d3 | 661 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
662 | struct mpc_group *grp = priv->mpcg; |
663 | struct th_header *header; | |
664 | struct sk_buff *nskb; | |
665 | int rc = 0; | |
666 | int ccw_idx; | |
667 | unsigned long hi; | |
668 | unsigned long saveflags = 0; /* avoids compiler warning */ | |
669 | __u16 block_len; | |
670 | ||
aa3f2cb6 PT |
671 | CTCM_PR_DEBUG("Enter %s: %s, cp=%i ch=0x%p id=%s state=%s\n", |
672 | __func__, dev->name, smp_processor_id(), ch, | |
673 | ch->id, fsm_getstate_str(ch->fsm)); | |
293d984f PT |
674 | |
675 | if ((fsm_getstate(ch->fsm) != CTC_STATE_TXIDLE) || grp->in_sweep) { | |
676 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
677 | atomic_inc(&skb->users); | |
678 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
679 | ||
680 | if (!p_header) { | |
293d984f | 681 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); |
aa3f2cb6 | 682 | goto nomem_exit; |
293d984f PT |
683 | } |
684 | ||
685 | p_header->pdu_offset = skb->len; | |
686 | p_header->pdu_proto = 0x01; | |
687 | p_header->pdu_flag = 0x00; | |
688 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
689 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
690 | } else { | |
691 | p_header->pdu_flag |= PDU_FIRST; | |
692 | } | |
693 | p_header->pdu_seq = 0; | |
694 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, | |
695 | PDU_HEADER_LENGTH); | |
696 | ||
aa3f2cb6 PT |
697 | CTCM_PR_DEBUG("%s(%s): Put on collect_q - skb len: %04x \n" |
698 | "pdu header and data for up to 32 bytes:\n", | |
699 | __func__, dev->name, skb->len); | |
700 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
701 | |
702 | skb_queue_tail(&ch->collect_queue, skb); | |
703 | ch->collect_len += skb->len; | |
704 | kfree(p_header); | |
705 | ||
706 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
707 | goto done; | |
708 | } | |
709 | ||
710 | /* | |
711 | * Protect skb against beeing free'd by upper | |
712 | * layers. | |
713 | */ | |
714 | atomic_inc(&skb->users); | |
715 | ||
716 | block_len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
717 | /* | |
718 | * IDAL support in CTCM is broken, so we have to | |
719 | * care about skb's above 2G ourselves. | |
720 | */ | |
721 | hi = ((unsigned long)skb->tail + TH_HEADER_LENGTH) >> 31; | |
722 | if (hi) { | |
723 | nskb = __dev_alloc_skb(skb->len, GFP_ATOMIC | GFP_DMA); | |
724 | if (!nskb) { | |
aa3f2cb6 | 725 | goto nomem_exit; |
293d984f PT |
726 | } else { |
727 | memcpy(skb_put(nskb, skb->len), skb->data, skb->len); | |
728 | atomic_inc(&nskb->users); | |
729 | atomic_dec(&skb->users); | |
730 | dev_kfree_skb_irq(skb); | |
731 | skb = nskb; | |
732 | } | |
733 | } | |
734 | ||
735 | p_header = kmalloc(PDU_HEADER_LENGTH, gfp_type()); | |
736 | ||
aa3f2cb6 PT |
737 | if (!p_header) |
738 | goto nomem_exit; | |
293d984f PT |
739 | |
740 | p_header->pdu_offset = skb->len; | |
741 | p_header->pdu_proto = 0x01; | |
742 | p_header->pdu_flag = 0x00; | |
743 | p_header->pdu_seq = 0; | |
744 | if (skb->protocol == ntohs(ETH_P_SNAP)) { | |
745 | p_header->pdu_flag |= PDU_FIRST | PDU_CNTL; | |
746 | } else { | |
747 | p_header->pdu_flag |= PDU_FIRST; | |
748 | } | |
749 | memcpy(skb_push(skb, PDU_HEADER_LENGTH), p_header, PDU_HEADER_LENGTH); | |
750 | ||
751 | kfree(p_header); | |
752 | ||
753 | if (ch->collect_len > 0) { | |
754 | spin_lock_irqsave(&ch->collect_lock, saveflags); | |
755 | skb_queue_tail(&ch->collect_queue, skb); | |
756 | ch->collect_len += skb->len; | |
757 | skb = skb_dequeue(&ch->collect_queue); | |
758 | ch->collect_len -= skb->len; | |
759 | spin_unlock_irqrestore(&ch->collect_lock, saveflags); | |
760 | } | |
761 | ||
762 | p_header = (struct pdu *)skb->data; | |
763 | p_header->pdu_flag |= PDU_LAST; | |
764 | ||
765 | ch->prof.txlen += skb->len - PDU_HEADER_LENGTH; | |
766 | ||
767 | header = kmalloc(TH_HEADER_LENGTH, gfp_type()); | |
aa3f2cb6 PT |
768 | if (!header) |
769 | goto nomem_exit; | |
293d984f PT |
770 | |
771 | header->th_seg = 0x00; | |
772 | header->th_ch_flag = TH_HAS_PDU; /* Normal data */ | |
773 | header->th_blk_flag = 0x00; | |
774 | header->th_is_xid = 0x00; /* Just data here */ | |
775 | ch->th_seq_num++; | |
776 | header->th_seq_num = ch->th_seq_num; | |
777 | ||
aa3f2cb6 PT |
778 | CTCM_PR_DBGDATA("%s(%s) ToVTAM_th_seq= %08x\n" , |
779 | __func__, dev->name, ch->th_seq_num); | |
293d984f PT |
780 | |
781 | /* put the TH on the packet */ | |
782 | memcpy(skb_push(skb, TH_HEADER_LENGTH), header, TH_HEADER_LENGTH); | |
783 | ||
784 | kfree(header); | |
785 | ||
aa3f2cb6 PT |
786 | CTCM_PR_DBGDATA("%s(%s): skb len: %04x\n - pdu header and data for " |
787 | "up to 32 bytes sent to vtam:\n", | |
788 | __func__, dev->name, skb->len); | |
789 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); | |
293d984f PT |
790 | |
791 | ch->ccw[4].count = skb->len; | |
792 | if (set_normalized_cda(&ch->ccw[4], skb->data)) { | |
793 | /* | |
aa3f2cb6 PT |
794 | * idal allocation failed, try via copying to trans_skb. |
795 | * trans_skb usually has a pre-allocated idal. | |
293d984f PT |
796 | */ |
797 | if (ctcm_checkalloc_buffer(ch)) { | |
798 | /* | |
aa3f2cb6 PT |
799 | * Remove our header. |
800 | * It gets added again on retransmit. | |
293d984f | 801 | */ |
aa3f2cb6 | 802 | goto nomem_exit; |
293d984f PT |
803 | } |
804 | ||
805 | skb_reset_tail_pointer(ch->trans_skb); | |
806 | ch->trans_skb->len = 0; | |
807 | ch->ccw[1].count = skb->len; | |
808 | memcpy(skb_put(ch->trans_skb, skb->len), skb->data, skb->len); | |
809 | atomic_dec(&skb->users); | |
810 | dev_kfree_skb_irq(skb); | |
811 | ccw_idx = 0; | |
aa3f2cb6 PT |
812 | CTCM_PR_DBGDATA("%s(%s): trans_skb len: %04x\n" |
813 | "up to 32 bytes sent to vtam:\n", | |
814 | __func__, dev->name, ch->trans_skb->len); | |
815 | CTCM_D3_DUMP((char *)ch->trans_skb->data, | |
816 | min_t(int, 32, ch->trans_skb->len)); | |
293d984f PT |
817 | } else { |
818 | skb_queue_tail(&ch->io_queue, skb); | |
819 | ccw_idx = 3; | |
820 | } | |
821 | ch->retry = 0; | |
822 | fsm_newstate(ch->fsm, CTC_STATE_TX); | |
823 | fsm_addtimer(&ch->timer, CTCM_TIME_5_SEC, CTC_EVENT_TIMER, ch); | |
824 | ||
825 | if (do_debug_ccw) | |
826 | ctcmpc_dumpit((char *)&ch->ccw[ccw_idx], | |
827 | sizeof(struct ccw1) * 3); | |
828 | ||
829 | spin_lock_irqsave(get_ccwdev_lock(ch->cdev), saveflags); | |
830 | ch->prof.send_stamp = current_kernel_time(); /* xtime */ | |
831 | rc = ccw_device_start(ch->cdev, &ch->ccw[ccw_idx], | |
832 | (unsigned long)ch, 0xff, 0); | |
833 | spin_unlock_irqrestore(get_ccwdev_lock(ch->cdev), saveflags); | |
834 | if (ccw_idx == 3) | |
835 | ch->prof.doios_single++; | |
836 | if (rc != 0) { | |
837 | fsm_deltimer(&ch->timer); | |
838 | ctcm_ccw_check_rc(ch, rc, "single skb TX"); | |
839 | if (ccw_idx == 3) | |
840 | skb_dequeue_tail(&ch->io_queue); | |
841 | } else if (ccw_idx == 0) { | |
842 | priv->stats.tx_packets++; | |
843 | priv->stats.tx_bytes += skb->len - TH_HEADER_LENGTH; | |
844 | } | |
aa3f2cb6 | 845 | if (ch->th_seq_num > 0xf0000000) /* Chose at random. */ |
293d984f PT |
846 | ctcmpc_send_sweep_req(ch); |
847 | ||
aa3f2cb6 PT |
848 | goto done; |
849 | nomem_exit: | |
850 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_CRIT, | |
851 | "%s(%s): MEMORY allocation ERROR\n", | |
852 | CTCM_FUNTAIL, ch->id); | |
853 | rc = -ENOMEM; | |
854 | atomic_dec(&skb->users); | |
855 | dev_kfree_skb_any(skb); | |
856 | fsm_event(priv->mpcg->fsm, MPCG_EVENT_INOP, dev); | |
293d984f | 857 | done: |
aa3f2cb6 PT |
858 | CTCM_PR_DEBUG("Exit %s(%s)\n", __func__, dev->name); |
859 | return rc; | |
293d984f PT |
860 | } |
861 | ||
862 | /** | |
863 | * Start transmission of a packet. | |
864 | * Called from generic network device layer. | |
865 | * | |
866 | * skb Pointer to buffer containing the packet. | |
867 | * dev Pointer to interface struct. | |
868 | * | |
869 | * returns 0 if packet consumed, !0 if packet rejected. | |
870 | * Note: If we return !0, then the packet is free'd by | |
871 | * the generic network layer. | |
872 | */ | |
873 | /* first merge version - leaving both functions separated */ | |
874 | static int ctcm_tx(struct sk_buff *skb, struct net_device *dev) | |
875 | { | |
261893d3 | 876 | struct ctcm_priv *priv = dev->ml_priv; |
293d984f PT |
877 | |
878 | if (skb == NULL) { | |
aa3f2cb6 PT |
879 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
880 | "%s(%s): NULL sk_buff passed", | |
881 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
882 | priv->stats.tx_dropped++; |
883 | return 0; | |
884 | } | |
885 | if (skb_headroom(skb) < (LL_HEADER_LENGTH + 2)) { | |
aa3f2cb6 PT |
886 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
887 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
888 | CTCM_FUNTAIL, dev->name, LL_HEADER_LENGTH + 2); | |
293d984f PT |
889 | dev_kfree_skb(skb); |
890 | priv->stats.tx_dropped++; | |
891 | return 0; | |
892 | } | |
893 | ||
894 | /* | |
895 | * If channels are not running, try to restart them | |
896 | * and throw away packet. | |
897 | */ | |
898 | if (fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) { | |
899 | fsm_event(priv->fsm, DEV_EVENT_START, dev); | |
900 | dev_kfree_skb(skb); | |
901 | priv->stats.tx_dropped++; | |
902 | priv->stats.tx_errors++; | |
903 | priv->stats.tx_carrier_errors++; | |
904 | return 0; | |
905 | } | |
906 | ||
907 | if (ctcm_test_and_set_busy(dev)) | |
3a05d140 | 908 | return NETDEV_TX_BUSY; |
293d984f PT |
909 | |
910 | dev->trans_start = jiffies; | |
911 | if (ctcm_transmit_skb(priv->channel[WRITE], skb) != 0) | |
3a05d140 | 912 | return NETDEV_TX_BUSY; |
aa3f2cb6 | 913 | return 0; |
293d984f PT |
914 | } |
915 | ||
916 | /* unmerged MPC variant of ctcm_tx */ | |
917 | static int ctcmpc_tx(struct sk_buff *skb, struct net_device *dev) | |
918 | { | |
919 | int len = 0; | |
261893d3 | 920 | struct ctcm_priv *priv = dev->ml_priv; |
aa3f2cb6 | 921 | struct mpc_group *grp = priv->mpcg; |
293d984f PT |
922 | struct sk_buff *newskb = NULL; |
923 | ||
293d984f PT |
924 | /* |
925 | * Some sanity checks ... | |
926 | */ | |
927 | if (skb == NULL) { | |
aa3f2cb6 PT |
928 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
929 | "%s(%s): NULL sk_buff passed", | |
930 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
931 | priv->stats.tx_dropped++; |
932 | goto done; | |
933 | } | |
934 | if (skb_headroom(skb) < (TH_HEADER_LENGTH + PDU_HEADER_LENGTH)) { | |
aa3f2cb6 PT |
935 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
936 | "%s(%s): Got sk_buff with head room < %ld bytes", | |
937 | CTCM_FUNTAIL, dev->name, | |
938 | TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
293d984f | 939 | |
aa3f2cb6 | 940 | CTCM_D3_DUMP((char *)skb->data, min_t(int, 32, skb->len)); |
293d984f PT |
941 | |
942 | len = skb->len + TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
943 | newskb = __dev_alloc_skb(len, gfp_type() | GFP_DMA); | |
944 | ||
945 | if (!newskb) { | |
aa3f2cb6 PT |
946 | CTCM_DBF_TEXT_(MPC_TRACE, CTC_DBF_ERROR, |
947 | "%s: %s: __dev_alloc_skb failed", | |
948 | __func__, dev->name); | |
293d984f PT |
949 | |
950 | dev_kfree_skb_any(skb); | |
951 | priv->stats.tx_dropped++; | |
952 | priv->stats.tx_errors++; | |
953 | priv->stats.tx_carrier_errors++; | |
954 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
955 | goto done; | |
956 | } | |
957 | newskb->protocol = skb->protocol; | |
958 | skb_reserve(newskb, TH_HEADER_LENGTH + PDU_HEADER_LENGTH); | |
959 | memcpy(skb_put(newskb, skb->len), skb->data, skb->len); | |
960 | dev_kfree_skb_any(skb); | |
961 | skb = newskb; | |
962 | } | |
963 | ||
964 | /* | |
965 | * If channels are not running, | |
966 | * notify anybody about a link failure and throw | |
967 | * away packet. | |
968 | */ | |
969 | if ((fsm_getstate(priv->fsm) != DEV_STATE_RUNNING) || | |
970 | (fsm_getstate(grp->fsm) < MPCG_STATE_XID2INITW)) { | |
971 | dev_kfree_skb_any(skb); | |
aa3f2cb6 PT |
972 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
973 | "%s(%s): inactive MPCGROUP - dropped", | |
974 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
975 | priv->stats.tx_dropped++; |
976 | priv->stats.tx_errors++; | |
977 | priv->stats.tx_carrier_errors++; | |
978 | goto done; | |
979 | } | |
980 | ||
981 | if (ctcm_test_and_set_busy(dev)) { | |
aa3f2cb6 PT |
982 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
983 | "%s(%s): device busy - dropped", | |
984 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
985 | dev_kfree_skb_any(skb); |
986 | priv->stats.tx_dropped++; | |
987 | priv->stats.tx_errors++; | |
988 | priv->stats.tx_carrier_errors++; | |
989 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
990 | goto done; | |
991 | } | |
992 | ||
993 | dev->trans_start = jiffies; | |
994 | if (ctcmpc_transmit_skb(priv->channel[WRITE], skb) != 0) { | |
aa3f2cb6 PT |
995 | CTCM_DBF_TEXT_(MPC_ERROR, CTC_DBF_ERROR, |
996 | "%s(%s): device error - dropped", | |
997 | CTCM_FUNTAIL, dev->name); | |
293d984f PT |
998 | dev_kfree_skb_any(skb); |
999 | priv->stats.tx_dropped++; | |
1000 | priv->stats.tx_errors++; | |
1001 | priv->stats.tx_carrier_errors++; | |
1002 | ctcm_clear_busy(dev); | |
1003 | fsm_event(grp->fsm, MPCG_EVENT_INOP, dev); | |
1004 | goto done; | |
1005 | } | |
1006 | ctcm_clear_busy(dev); | |
1007 | done: | |
1008 | if (do_debug) | |
1009 | MPC_DBF_DEV_NAME(TRACE, dev, "exit"); | |
1010 | ||
1011 | return 0; /* handle freeing of skb here */ | |
1012 | } | |
1013 | ||
1014 | ||
1015 | /** | |
1016 | * Sets MTU of an interface. | |
1017 | * | |
1018 | * dev Pointer to interface struct. | |
1019 | * new_mtu The new MTU to use for this interface. | |
1020 | * | |
1021 | * returns 0 on success, -EINVAL if MTU is out of valid range. | |
1022 | * (valid range is 576 .. 65527). If VM is on the | |
1023 | * remote side, maximum MTU is 32760, however this is | |
1024 | * not checked here. | |
1025 | */ | |
1026 | static int ctcm_change_mtu(struct net_device *dev, int new_mtu) | |
1027 | { | |
1028 | struct ctcm_priv *priv; | |
1029 | int max_bufsize; | |
1030 | ||
293d984f PT |
1031 | if (new_mtu < 576 || new_mtu > 65527) |
1032 | return -EINVAL; | |
1033 | ||
261893d3 | 1034 | priv = dev->ml_priv; |
293d984f PT |
1035 | max_bufsize = priv->channel[READ]->max_bufsize; |
1036 | ||
1037 | if (IS_MPC(priv)) { | |
1038 | if (new_mtu > max_bufsize - TH_HEADER_LENGTH) | |
1039 | return -EINVAL; | |
1040 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; | |
1041 | } else { | |
1042 | if (new_mtu > max_bufsize - LL_HEADER_LENGTH - 2) | |
1043 | return -EINVAL; | |
1044 | dev->hard_header_len = LL_HEADER_LENGTH + 2; | |
1045 | } | |
1046 | dev->mtu = new_mtu; | |
1047 | return 0; | |
1048 | } | |
1049 | ||
1050 | /** | |
1051 | * Returns interface statistics of a device. | |
1052 | * | |
1053 | * dev Pointer to interface struct. | |
1054 | * | |
1055 | * returns Pointer to stats struct of this interface. | |
1056 | */ | |
1057 | static struct net_device_stats *ctcm_stats(struct net_device *dev) | |
1058 | { | |
261893d3 | 1059 | return &((struct ctcm_priv *)dev->ml_priv)->stats; |
293d984f PT |
1060 | } |
1061 | ||
293d984f PT |
1062 | static void ctcm_free_netdevice(struct net_device *dev) |
1063 | { | |
1064 | struct ctcm_priv *priv; | |
1065 | struct mpc_group *grp; | |
1066 | ||
aa3f2cb6 PT |
1067 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1068 | "%s(%s)", CTCM_FUNTAIL, dev->name); | |
261893d3 | 1069 | priv = dev->ml_priv; |
293d984f PT |
1070 | if (priv) { |
1071 | grp = priv->mpcg; | |
1072 | if (grp) { | |
1073 | if (grp->fsm) | |
1074 | kfree_fsm(grp->fsm); | |
1075 | if (grp->xid_skb) | |
1076 | dev_kfree_skb(grp->xid_skb); | |
1077 | if (grp->rcvd_xid_skb) | |
1078 | dev_kfree_skb(grp->rcvd_xid_skb); | |
1079 | tasklet_kill(&grp->mpc_tasklet2); | |
1080 | kfree(grp); | |
1081 | priv->mpcg = NULL; | |
1082 | } | |
1083 | if (priv->fsm) { | |
1084 | kfree_fsm(priv->fsm); | |
1085 | priv->fsm = NULL; | |
1086 | } | |
1087 | kfree(priv->xid); | |
1088 | priv->xid = NULL; | |
1089 | /* | |
1090 | * Note: kfree(priv); is done in "opposite" function of | |
1091 | * allocator function probe_device which is remove_device. | |
1092 | */ | |
1093 | } | |
1094 | #ifdef MODULE | |
1095 | free_netdev(dev); | |
1096 | #endif | |
1097 | } | |
1098 | ||
1099 | struct mpc_group *ctcmpc_init_mpc_group(struct ctcm_priv *priv); | |
1100 | ||
69b3aa60 FB |
1101 | static const struct net_device_ops ctcm_netdev_ops = { |
1102 | .ndo_open = ctcm_open, | |
1103 | .ndo_stop = ctcm_close, | |
1104 | .ndo_get_stats = ctcm_stats, | |
1105 | .ndo_change_mtu = ctcm_change_mtu, | |
1106 | .ndo_start_xmit = ctcm_tx, | |
1107 | }; | |
1108 | ||
1109 | static const struct net_device_ops ctcm_mpc_netdev_ops = { | |
1110 | .ndo_open = ctcm_open, | |
1111 | .ndo_stop = ctcm_close, | |
1112 | .ndo_get_stats = ctcm_stats, | |
1113 | .ndo_change_mtu = ctcm_change_mtu, | |
1114 | .ndo_start_xmit = ctcmpc_tx, | |
1115 | }; | |
1116 | ||
293d984f PT |
1117 | void static ctcm_dev_setup(struct net_device *dev) |
1118 | { | |
293d984f PT |
1119 | dev->type = ARPHRD_SLIP; |
1120 | dev->tx_queue_len = 100; | |
1121 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; | |
1122 | } | |
1123 | ||
1124 | /* | |
1125 | * Initialize everything of the net device except the name and the | |
1126 | * channel structs. | |
1127 | */ | |
1128 | static struct net_device *ctcm_init_netdevice(struct ctcm_priv *priv) | |
1129 | { | |
1130 | struct net_device *dev; | |
1131 | struct mpc_group *grp; | |
1132 | if (!priv) | |
1133 | return NULL; | |
1134 | ||
1135 | if (IS_MPC(priv)) | |
1136 | dev = alloc_netdev(0, MPC_DEVICE_GENE, ctcm_dev_setup); | |
1137 | else | |
1138 | dev = alloc_netdev(0, CTC_DEVICE_GENE, ctcm_dev_setup); | |
1139 | ||
1140 | if (!dev) { | |
aa3f2cb6 PT |
1141 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_CRIT, |
1142 | "%s: MEMORY allocation ERROR", | |
1143 | CTCM_FUNTAIL); | |
293d984f PT |
1144 | return NULL; |
1145 | } | |
261893d3 | 1146 | dev->ml_priv = priv; |
293d984f PT |
1147 | priv->fsm = init_fsm("ctcmdev", dev_state_names, dev_event_names, |
1148 | CTCM_NR_DEV_STATES, CTCM_NR_DEV_EVENTS, | |
1149 | dev_fsm, dev_fsm_len, GFP_KERNEL); | |
1150 | if (priv->fsm == NULL) { | |
1151 | CTCMY_DBF_DEV(SETUP, dev, "init_fsm error"); | |
1152 | kfree(dev); | |
1153 | return NULL; | |
1154 | } | |
1155 | fsm_newstate(priv->fsm, DEV_STATE_STOPPED); | |
1156 | fsm_settimer(priv->fsm, &priv->restart_timer); | |
1157 | ||
1158 | if (IS_MPC(priv)) { | |
1159 | /* MPC Group Initializations */ | |
1160 | grp = ctcmpc_init_mpc_group(priv); | |
1161 | if (grp == NULL) { | |
1162 | MPC_DBF_DEV(SETUP, dev, "init_mpc_group error"); | |
1163 | kfree(dev); | |
1164 | return NULL; | |
1165 | } | |
1166 | tasklet_init(&grp->mpc_tasklet2, | |
1167 | mpc_group_ready, (unsigned long)dev); | |
1168 | dev->mtu = MPC_BUFSIZE_DEFAULT - | |
1169 | TH_HEADER_LENGTH - PDU_HEADER_LENGTH; | |
1170 | ||
69b3aa60 | 1171 | dev->netdev_ops = &ctcm_mpc_netdev_ops; |
293d984f PT |
1172 | dev->hard_header_len = TH_HEADER_LENGTH + PDU_HEADER_LENGTH; |
1173 | priv->buffer_size = MPC_BUFSIZE_DEFAULT; | |
1174 | } else { | |
1175 | dev->mtu = CTCM_BUFSIZE_DEFAULT - LL_HEADER_LENGTH - 2; | |
69b3aa60 | 1176 | dev->netdev_ops = &ctcm_netdev_ops; |
293d984f PT |
1177 | dev->hard_header_len = LL_HEADER_LENGTH + 2; |
1178 | } | |
1179 | ||
1180 | CTCMY_DBF_DEV(SETUP, dev, "finished"); | |
aa3f2cb6 | 1181 | |
293d984f PT |
1182 | return dev; |
1183 | } | |
1184 | ||
1185 | /** | |
1186 | * Main IRQ handler. | |
1187 | * | |
1188 | * cdev The ccw_device the interrupt is for. | |
1189 | * intparm interruption parameter. | |
1190 | * irb interruption response block. | |
1191 | */ | |
1192 | static void ctcm_irq_handler(struct ccw_device *cdev, | |
1193 | unsigned long intparm, struct irb *irb) | |
1194 | { | |
1195 | struct channel *ch; | |
1196 | struct net_device *dev; | |
1197 | struct ctcm_priv *priv; | |
1198 | struct ccwgroup_device *cgdev; | |
aa3f2cb6 PT |
1199 | int cstat; |
1200 | int dstat; | |
1201 | ||
1202 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_DEBUG, | |
2a0217d5 | 1203 | "Enter %s(%s)", CTCM_FUNTAIL, dev_name(&cdev->dev)); |
293d984f | 1204 | |
293d984f PT |
1205 | if (ctcm_check_irb_error(cdev, irb)) |
1206 | return; | |
1207 | ||
1208 | cgdev = dev_get_drvdata(&cdev->dev); | |
1209 | ||
aa3f2cb6 PT |
1210 | cstat = irb->scsw.cmd.cstat; |
1211 | dstat = irb->scsw.cmd.dstat; | |
1212 | ||
293d984f PT |
1213 | /* Check for unsolicited interrupts. */ |
1214 | if (cgdev == NULL) { | |
2a7c6f2c PT |
1215 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_ERROR, |
1216 | "%s(%s) unsolicited irq: c-%02x d-%02x\n", | |
1217 | CTCM_FUNTAIL, dev_name(&cdev->dev), cstat, dstat); | |
1218 | dev_warn(&cdev->dev, | |
1219 | "The adapter received a non-specific IRQ\n"); | |
293d984f PT |
1220 | return; |
1221 | } | |
1222 | ||
1223 | priv = dev_get_drvdata(&cgdev->dev); | |
1224 | ||
1225 | /* Try to extract channel from driver data. */ | |
1226 | if (priv->channel[READ]->cdev == cdev) | |
1227 | ch = priv->channel[READ]; | |
1228 | else if (priv->channel[WRITE]->cdev == cdev) | |
1229 | ch = priv->channel[WRITE]; | |
1230 | else { | |
2a7c6f2c PT |
1231 | dev_err(&cdev->dev, |
1232 | "%s: Internal error: Can't determine channel for " | |
1233 | "interrupt device %s\n", | |
1234 | __func__, dev_name(&cdev->dev)); | |
1235 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1236 | return; |
1237 | } | |
1238 | ||
aa3f2cb6 | 1239 | dev = ch->netdev; |
293d984f | 1240 | if (dev == NULL) { |
2a7c6f2c PT |
1241 | dev_err(&cdev->dev, |
1242 | "%s Internal error: net_device is NULL, ch = 0x%p\n", | |
1243 | __func__, ch); | |
1244 | /* Explain: inconsistent internal structures */ | |
293d984f PT |
1245 | return; |
1246 | } | |
1247 | ||
293d984f PT |
1248 | /* Copy interruption response block. */ |
1249 | memcpy(ch->irb, irb, sizeof(struct irb)); | |
1250 | ||
2a7c6f2c | 1251 | /* Issue error message and return on subchannel error code */ |
23d805b6 | 1252 | if (irb->scsw.cmd.cstat) { |
293d984f | 1253 | fsm_event(ch->fsm, CTC_EVENT_SC_UNKNOWN, ch); |
2a7c6f2c PT |
1254 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
1255 | "%s(%s): sub-ch check %s: cs=%02x ds=%02x", | |
1256 | CTCM_FUNTAIL, dev->name, ch->id, cstat, dstat); | |
1257 | dev_warn(&cdev->dev, | |
1258 | "A check occurred on the subchannel\n"); | |
293d984f PT |
1259 | return; |
1260 | } | |
1261 | ||
1262 | /* Check the reason-code of a unit check */ | |
23d805b6 | 1263 | if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK) { |
aa3f2cb6 PT |
1264 | if ((irb->ecw[0] & ch->sense_rc) == 0) |
1265 | /* print it only once */ | |
2a7c6f2c | 1266 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_WARN, |
aa3f2cb6 PT |
1267 | "%s(%s): sense=%02x, ds=%02x", |
1268 | CTCM_FUNTAIL, ch->id, irb->ecw[0], dstat); | |
293d984f PT |
1269 | ccw_unit_check(ch, irb->ecw[0]); |
1270 | return; | |
1271 | } | |
23d805b6 PO |
1272 | if (irb->scsw.cmd.dstat & DEV_STAT_BUSY) { |
1273 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) | |
293d984f PT |
1274 | fsm_event(ch->fsm, CTC_EVENT_ATTNBUSY, ch); |
1275 | else | |
1276 | fsm_event(ch->fsm, CTC_EVENT_BUSY, ch); | |
1277 | return; | |
1278 | } | |
23d805b6 | 1279 | if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) { |
293d984f PT |
1280 | fsm_event(ch->fsm, CTC_EVENT_ATTN, ch); |
1281 | return; | |
1282 | } | |
23d805b6 PO |
1283 | if ((irb->scsw.cmd.stctl & SCSW_STCTL_SEC_STATUS) || |
1284 | (irb->scsw.cmd.stctl == SCSW_STCTL_STATUS_PEND) || | |
1285 | (irb->scsw.cmd.stctl == | |
293d984f PT |
1286 | (SCSW_STCTL_ALERT_STATUS | SCSW_STCTL_STATUS_PEND))) |
1287 | fsm_event(ch->fsm, CTC_EVENT_FINSTAT, ch); | |
1288 | else | |
1289 | fsm_event(ch->fsm, CTC_EVENT_IRQ, ch); | |
1290 | ||
1291 | } | |
1292 | ||
1293 | /** | |
1294 | * Add ctcm specific attributes. | |
1295 | * Add ctcm private data. | |
1296 | * | |
1297 | * cgdev pointer to ccwgroup_device just added | |
1298 | * | |
1299 | * returns 0 on success, !0 on failure. | |
1300 | */ | |
1301 | static int ctcm_probe_device(struct ccwgroup_device *cgdev) | |
1302 | { | |
1303 | struct ctcm_priv *priv; | |
1304 | int rc; | |
1305 | ||
aa3f2cb6 PT |
1306 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1307 | "%s %p", | |
1308 | __func__, cgdev); | |
293d984f PT |
1309 | |
1310 | if (!get_device(&cgdev->dev)) | |
1311 | return -ENODEV; | |
1312 | ||
1313 | priv = kzalloc(sizeof(struct ctcm_priv), GFP_KERNEL); | |
1314 | if (!priv) { | |
aa3f2cb6 PT |
1315 | CTCM_DBF_TEXT_(ERROR, CTC_DBF_ERROR, |
1316 | "%s: memory allocation failure", | |
1317 | CTCM_FUNTAIL); | |
293d984f PT |
1318 | put_device(&cgdev->dev); |
1319 | return -ENOMEM; | |
1320 | } | |
1321 | ||
1322 | rc = ctcm_add_files(&cgdev->dev); | |
1323 | if (rc) { | |
1324 | kfree(priv); | |
1325 | put_device(&cgdev->dev); | |
1326 | return rc; | |
1327 | } | |
1328 | priv->buffer_size = CTCM_BUFSIZE_DEFAULT; | |
1329 | cgdev->cdev[0]->handler = ctcm_irq_handler; | |
1330 | cgdev->cdev[1]->handler = ctcm_irq_handler; | |
1331 | dev_set_drvdata(&cgdev->dev, priv); | |
1332 | ||
1333 | return 0; | |
1334 | } | |
1335 | ||
1336 | /** | |
1337 | * Add a new channel to the list of channels. | |
1338 | * Keeps the channel list sorted. | |
1339 | * | |
1340 | * cdev The ccw_device to be added. | |
1341 | * type The type class of the new channel. | |
1342 | * priv Points to the private data of the ccwgroup_device. | |
1343 | * | |
1344 | * returns 0 on success, !0 on error. | |
1345 | */ | |
1346 | static int add_channel(struct ccw_device *cdev, enum channel_types type, | |
1347 | struct ctcm_priv *priv) | |
1348 | { | |
1349 | struct channel **c = &channels; | |
1350 | struct channel *ch; | |
1351 | int ccw_num; | |
1352 | int rc = 0; | |
1353 | ||
aa3f2cb6 PT |
1354 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
1355 | "%s(%s), type %d, proto %d", | |
2a0217d5 | 1356 | __func__, dev_name(&cdev->dev), type, priv->protocol); |
aa3f2cb6 | 1357 | |
293d984f PT |
1358 | ch = kzalloc(sizeof(struct channel), GFP_KERNEL); |
1359 | if (ch == NULL) | |
aa3f2cb6 | 1360 | return -ENOMEM; |
293d984f PT |
1361 | |
1362 | ch->protocol = priv->protocol; | |
1363 | if (IS_MPC(priv)) { | |
1364 | ch->discontact_th = (struct th_header *) | |
1365 | kzalloc(TH_HEADER_LENGTH, gfp_type()); | |
1366 | if (ch->discontact_th == NULL) | |
1367 | goto nomem_return; | |
1368 | ||
1369 | ch->discontact_th->th_blk_flag = TH_DISCONTACT; | |
1370 | tasklet_init(&ch->ch_disc_tasklet, | |
1371 | mpc_action_send_discontact, (unsigned long)ch); | |
1372 | ||
1373 | tasklet_init(&ch->ch_tasklet, ctcmpc_bh, (unsigned long)ch); | |
1374 | ch->max_bufsize = (MPC_BUFSIZE_DEFAULT - 35); | |
1375 | ccw_num = 17; | |
1376 | } else | |
1377 | ccw_num = 8; | |
1378 | ||
1379 | ch->ccw = (struct ccw1 *) | |
1380 | kzalloc(ccw_num * sizeof(struct ccw1), GFP_KERNEL | GFP_DMA); | |
1381 | if (ch->ccw == NULL) | |
1382 | goto nomem_return; | |
1383 | ||
1384 | ch->cdev = cdev; | |
2a0217d5 | 1385 | snprintf(ch->id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev->dev)); |
293d984f PT |
1386 | ch->type = type; |
1387 | ||
1388 | /** | |
1389 | * "static" ccws are used in the following way: | |
1390 | * | |
1391 | * ccw[0..2] (Channel program for generic I/O): | |
1392 | * 0: prepare | |
1393 | * 1: read or write (depending on direction) with fixed | |
1394 | * buffer (idal allocated once when buffer is allocated) | |
1395 | * 2: nop | |
1396 | * ccw[3..5] (Channel program for direct write of packets) | |
1397 | * 3: prepare | |
1398 | * 4: write (idal allocated on every write). | |
1399 | * 5: nop | |
1400 | * ccw[6..7] (Channel program for initial channel setup): | |
1401 | * 6: set extended mode | |
1402 | * 7: nop | |
1403 | * | |
1404 | * ch->ccw[0..5] are initialized in ch_action_start because | |
1405 | * the channel's direction is yet unknown here. | |
1406 | * | |
1407 | * ccws used for xid2 negotiations | |
1408 | * ch-ccw[8-14] need to be used for the XID exchange either | |
1409 | * X side XID2 Processing | |
1410 | * 8: write control | |
1411 | * 9: write th | |
1412 | * 10: write XID | |
1413 | * 11: read th from secondary | |
1414 | * 12: read XID from secondary | |
1415 | * 13: read 4 byte ID | |
1416 | * 14: nop | |
1417 | * Y side XID Processing | |
1418 | * 8: sense | |
1419 | * 9: read th | |
1420 | * 10: read XID | |
1421 | * 11: write th | |
1422 | * 12: write XID | |
1423 | * 13: write 4 byte ID | |
1424 | * 14: nop | |
1425 | * | |
1426 | * ccws used for double noop due to VM timing issues | |
1427 | * which result in unrecoverable Busy on channel | |
1428 | * 15: nop | |
1429 | * 16: nop | |
1430 | */ | |
1431 | ch->ccw[6].cmd_code = CCW_CMD_SET_EXTENDED; | |
1432 | ch->ccw[6].flags = CCW_FLAG_SLI; | |
1433 | ||
1434 | ch->ccw[7].cmd_code = CCW_CMD_NOOP; | |
1435 | ch->ccw[7].flags = CCW_FLAG_SLI; | |
1436 | ||
1437 | if (IS_MPC(priv)) { | |
1438 | ch->ccw[15].cmd_code = CCW_CMD_WRITE; | |
1439 | ch->ccw[15].flags = CCW_FLAG_SLI | CCW_FLAG_CC; | |
1440 | ch->ccw[15].count = TH_HEADER_LENGTH; | |
1441 | ch->ccw[15].cda = virt_to_phys(ch->discontact_th); | |
1442 | ||
1443 | ch->ccw[16].cmd_code = CCW_CMD_NOOP; | |
1444 | ch->ccw[16].flags = CCW_FLAG_SLI; | |
1445 | ||
1446 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1447 | ctc_ch_event_names, CTC_MPC_NR_STATES, | |
1448 | CTC_MPC_NR_EVENTS, ctcmpc_ch_fsm, | |
1449 | mpc_ch_fsm_len, GFP_KERNEL); | |
1450 | } else { | |
1451 | ch->fsm = init_fsm(ch->id, ctc_ch_state_names, | |
1452 | ctc_ch_event_names, CTC_NR_STATES, | |
1453 | CTC_NR_EVENTS, ch_fsm, | |
1454 | ch_fsm_len, GFP_KERNEL); | |
1455 | } | |
1456 | if (ch->fsm == NULL) | |
1457 | goto free_return; | |
1458 | ||
1459 | fsm_newstate(ch->fsm, CTC_STATE_IDLE); | |
1460 | ||
1461 | ch->irb = kzalloc(sizeof(struct irb), GFP_KERNEL); | |
1462 | if (ch->irb == NULL) | |
1463 | goto nomem_return; | |
1464 | ||
1465 | while (*c && ctcm_less_than((*c)->id, ch->id)) | |
1466 | c = &(*c)->next; | |
1467 | ||
1468 | if (*c && (!strncmp((*c)->id, ch->id, CTCM_ID_SIZE))) { | |
1469 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
1470 | "%s (%s) already in list, using old entry", | |
aa3f2cb6 | 1471 | __func__, (*c)->id); |
293d984f PT |
1472 | |
1473 | goto free_return; | |
1474 | } | |
1475 | ||
1476 | spin_lock_init(&ch->collect_lock); | |
1477 | ||
1478 | fsm_settimer(ch->fsm, &ch->timer); | |
1479 | skb_queue_head_init(&ch->io_queue); | |
1480 | skb_queue_head_init(&ch->collect_queue); | |
1481 | ||
1482 | if (IS_MPC(priv)) { | |
1483 | fsm_settimer(ch->fsm, &ch->sweep_timer); | |
1484 | skb_queue_head_init(&ch->sweep_queue); | |
1485 | } | |
1486 | ch->next = *c; | |
1487 | *c = ch; | |
1488 | return 0; | |
1489 | ||
1490 | nomem_return: | |
293d984f PT |
1491 | rc = -ENOMEM; |
1492 | ||
1493 | free_return: /* note that all channel pointers are 0 or valid */ | |
aa3f2cb6 | 1494 | kfree(ch->ccw); |
293d984f PT |
1495 | kfree(ch->discontact_th); |
1496 | kfree_fsm(ch->fsm); | |
1497 | kfree(ch->irb); | |
1498 | kfree(ch); | |
1499 | return rc; | |
1500 | } | |
1501 | ||
1502 | /* | |
1503 | * Return type of a detected device. | |
1504 | */ | |
1505 | static enum channel_types get_channel_type(struct ccw_device_id *id) | |
1506 | { | |
1507 | enum channel_types type; | |
1508 | type = (enum channel_types)id->driver_info; | |
1509 | ||
1510 | if (type == channel_type_ficon) | |
1511 | type = channel_type_escon; | |
1512 | ||
1513 | return type; | |
1514 | } | |
1515 | ||
1516 | /** | |
1517 | * | |
1518 | * Setup an interface. | |
1519 | * | |
1520 | * cgdev Device to be setup. | |
1521 | * | |
1522 | * returns 0 on success, !0 on failure. | |
1523 | */ | |
1524 | static int ctcm_new_device(struct ccwgroup_device *cgdev) | |
1525 | { | |
1526 | char read_id[CTCM_ID_SIZE]; | |
1527 | char write_id[CTCM_ID_SIZE]; | |
1528 | int direction; | |
1529 | enum channel_types type; | |
1530 | struct ctcm_priv *priv; | |
1531 | struct net_device *dev; | |
aa3f2cb6 PT |
1532 | struct ccw_device *cdev0; |
1533 | struct ccw_device *cdev1; | |
293d984f PT |
1534 | int ret; |
1535 | ||
293d984f PT |
1536 | priv = dev_get_drvdata(&cgdev->dev); |
1537 | if (!priv) | |
1538 | return -ENODEV; | |
1539 | ||
aa3f2cb6 PT |
1540 | cdev0 = cgdev->cdev[0]; |
1541 | cdev1 = cgdev->cdev[1]; | |
1542 | ||
1543 | type = get_channel_type(&cdev0->id); | |
293d984f | 1544 | |
b9d3aed7 CH |
1545 | snprintf(read_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev0->dev)); |
1546 | snprintf(write_id, CTCM_ID_SIZE, "ch-%s", dev_name(&cdev1->dev)); | |
293d984f | 1547 | |
aa3f2cb6 | 1548 | ret = add_channel(cdev0, type, priv); |
293d984f PT |
1549 | if (ret) |
1550 | return ret; | |
aa3f2cb6 | 1551 | ret = add_channel(cdev1, type, priv); |
293d984f PT |
1552 | if (ret) |
1553 | return ret; | |
1554 | ||
aa3f2cb6 | 1555 | ret = ccw_device_set_online(cdev0); |
293d984f | 1556 | if (ret != 0) { |
aa3f2cb6 PT |
1557 | /* may be ok to fail now - can be done later */ |
1558 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, | |
1559 | "%s(%s) set_online rc=%d", | |
1560 | CTCM_FUNTAIL, read_id, ret); | |
293d984f PT |
1561 | } |
1562 | ||
aa3f2cb6 | 1563 | ret = ccw_device_set_online(cdev1); |
293d984f | 1564 | if (ret != 0) { |
aa3f2cb6 PT |
1565 | /* may be ok to fail now - can be done later */ |
1566 | CTCM_DBF_TEXT_(TRACE, CTC_DBF_NOTICE, | |
1567 | "%s(%s) set_online rc=%d", | |
1568 | CTCM_FUNTAIL, write_id, ret); | |
293d984f PT |
1569 | } |
1570 | ||
1571 | dev = ctcm_init_netdevice(priv); | |
aa3f2cb6 PT |
1572 | if (dev == NULL) |
1573 | goto out; | |
293d984f PT |
1574 | |
1575 | for (direction = READ; direction <= WRITE; direction++) { | |
1576 | priv->channel[direction] = | |
1577 | channel_get(type, direction == READ ? read_id : write_id, | |
1578 | direction); | |
1579 | if (priv->channel[direction] == NULL) { | |
1580 | if (direction == WRITE) | |
1581 | channel_free(priv->channel[READ]); | |
aa3f2cb6 | 1582 | goto out_dev; |
293d984f PT |
1583 | } |
1584 | priv->channel[direction]->netdev = dev; | |
1585 | priv->channel[direction]->protocol = priv->protocol; | |
1586 | priv->channel[direction]->max_bufsize = priv->buffer_size; | |
1587 | } | |
1588 | /* sysfs magic */ | |
1589 | SET_NETDEV_DEV(dev, &cgdev->dev); | |
1590 | ||
aa3f2cb6 PT |
1591 | if (register_netdev(dev)) |
1592 | goto out_dev; | |
293d984f PT |
1593 | |
1594 | if (ctcm_add_attributes(&cgdev->dev)) { | |
aa3f2cb6 PT |
1595 | unregister_netdev(dev); |
1596 | goto out_dev; | |
293d984f PT |
1597 | } |
1598 | ||
1599 | strlcpy(priv->fsm->name, dev->name, sizeof(priv->fsm->name)); | |
1600 | ||
2a7c6f2c PT |
1601 | dev_info(&dev->dev, |
1602 | "setup OK : r/w = %s/%s, protocol : %d\n", | |
1603 | priv->channel[READ]->id, | |
1604 | priv->channel[WRITE]->id, priv->protocol); | |
1605 | ||
293d984f | 1606 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, |
aa3f2cb6 PT |
1607 | "setup(%s) OK : r/w = %s/%s, protocol : %d", dev->name, |
1608 | priv->channel[READ]->id, | |
293d984f PT |
1609 | priv->channel[WRITE]->id, priv->protocol); |
1610 | ||
1611 | return 0; | |
aa3f2cb6 PT |
1612 | out_dev: |
1613 | ctcm_free_netdevice(dev); | |
293d984f PT |
1614 | out: |
1615 | ccw_device_set_offline(cgdev->cdev[1]); | |
1616 | ccw_device_set_offline(cgdev->cdev[0]); | |
1617 | ||
1618 | return -ENODEV; | |
1619 | } | |
1620 | ||
1621 | /** | |
1622 | * Shutdown an interface. | |
1623 | * | |
1624 | * cgdev Device to be shut down. | |
1625 | * | |
1626 | * returns 0 on success, !0 on failure. | |
1627 | */ | |
1628 | static int ctcm_shutdown_device(struct ccwgroup_device *cgdev) | |
1629 | { | |
1630 | struct ctcm_priv *priv; | |
1631 | struct net_device *dev; | |
1632 | ||
1633 | priv = dev_get_drvdata(&cgdev->dev); | |
1634 | if (!priv) | |
1635 | return -ENODEV; | |
1636 | ||
1637 | if (priv->channel[READ]) { | |
1638 | dev = priv->channel[READ]->netdev; | |
1639 | CTCM_DBF_DEV(SETUP, dev, ""); | |
1640 | /* Close the device */ | |
1641 | ctcm_close(dev); | |
1642 | dev->flags &= ~IFF_RUNNING; | |
1643 | ctcm_remove_attributes(&cgdev->dev); | |
1644 | channel_free(priv->channel[READ]); | |
1645 | } else | |
1646 | dev = NULL; | |
1647 | ||
1648 | if (priv->channel[WRITE]) | |
1649 | channel_free(priv->channel[WRITE]); | |
1650 | ||
1651 | if (dev) { | |
aa3f2cb6 | 1652 | unregister_netdev(dev); |
293d984f PT |
1653 | ctcm_free_netdevice(dev); |
1654 | } | |
1655 | ||
1656 | if (priv->fsm) | |
1657 | kfree_fsm(priv->fsm); | |
1658 | ||
1659 | ccw_device_set_offline(cgdev->cdev[1]); | |
1660 | ccw_device_set_offline(cgdev->cdev[0]); | |
1661 | ||
1662 | if (priv->channel[READ]) | |
1663 | channel_remove(priv->channel[READ]); | |
1664 | if (priv->channel[WRITE]) | |
1665 | channel_remove(priv->channel[WRITE]); | |
1666 | priv->channel[READ] = priv->channel[WRITE] = NULL; | |
1667 | ||
1668 | return 0; | |
1669 | ||
1670 | } | |
1671 | ||
1672 | ||
1673 | static void ctcm_remove_device(struct ccwgroup_device *cgdev) | |
1674 | { | |
aa3f2cb6 | 1675 | struct ctcm_priv *priv = dev_get_drvdata(&cgdev->dev); |
293d984f | 1676 | |
aa3f2cb6 PT |
1677 | BUG_ON(priv == NULL); |
1678 | ||
1679 | CTCM_DBF_TEXT_(SETUP, CTC_DBF_INFO, | |
8ac6d452 UB |
1680 | "removing device %p, proto : %d", |
1681 | cgdev, priv->protocol); | |
293d984f | 1682 | |
293d984f PT |
1683 | if (cgdev->state == CCWGROUP_ONLINE) |
1684 | ctcm_shutdown_device(cgdev); | |
1685 | ctcm_remove_files(&cgdev->dev); | |
1686 | dev_set_drvdata(&cgdev->dev, NULL); | |
1687 | kfree(priv); | |
1688 | put_device(&cgdev->dev); | |
1689 | } | |
1690 | ||
1691 | static struct ccwgroup_driver ctcm_group_driver = { | |
1692 | .owner = THIS_MODULE, | |
1693 | .name = CTC_DRIVER_NAME, | |
1694 | .max_slaves = 2, | |
1695 | .driver_id = 0xC3E3C3D4, /* CTCM */ | |
1696 | .probe = ctcm_probe_device, | |
1697 | .remove = ctcm_remove_device, | |
1698 | .set_online = ctcm_new_device, | |
1699 | .set_offline = ctcm_shutdown_device, | |
1700 | }; | |
1701 | ||
1702 | ||
1703 | /* | |
1704 | * Module related routines | |
1705 | */ | |
1706 | ||
1707 | /* | |
1708 | * Prepare to be unloaded. Free IRQ's and release all resources. | |
1709 | * This is called just before this module is unloaded. It is | |
1710 | * not called, if the usage count is !0, so we don't need to check | |
1711 | * for that. | |
1712 | */ | |
1713 | static void __exit ctcm_exit(void) | |
1714 | { | |
1715 | unregister_cu3088_discipline(&ctcm_group_driver); | |
1716 | ctcm_unregister_dbf_views(); | |
2a7c6f2c | 1717 | pr_info("CTCM driver unloaded\n"); |
293d984f PT |
1718 | } |
1719 | ||
1720 | /* | |
1721 | * Print Banner. | |
1722 | */ | |
1723 | static void print_banner(void) | |
1724 | { | |
2a7c6f2c | 1725 | pr_info("CTCM driver initialized\n"); |
293d984f PT |
1726 | } |
1727 | ||
1728 | /** | |
1729 | * Initialize module. | |
1730 | * This is called just after the module is loaded. | |
1731 | * | |
1732 | * returns 0 on success, !0 on error. | |
1733 | */ | |
1734 | static int __init ctcm_init(void) | |
1735 | { | |
1736 | int ret; | |
1737 | ||
1738 | channels = NULL; | |
1739 | ||
1740 | ret = ctcm_register_dbf_views(); | |
1741 | if (ret) { | |
293d984f PT |
1742 | return ret; |
1743 | } | |
1744 | ret = register_cu3088_discipline(&ctcm_group_driver); | |
1745 | if (ret) { | |
1746 | ctcm_unregister_dbf_views(); | |
2a7c6f2c PT |
1747 | pr_err("%s / register_cu3088_discipline failed, ret = %d\n", |
1748 | __func__, ret); | |
293d984f PT |
1749 | return ret; |
1750 | } | |
1751 | print_banner(); | |
1752 | return ret; | |
1753 | } | |
1754 | ||
1755 | module_init(ctcm_init); | |
1756 | module_exit(ctcm_exit); | |
1757 | ||
1758 | MODULE_AUTHOR("Peter Tiedemann <ptiedem@de.ibm.com>"); | |
1759 | MODULE_DESCRIPTION("Network driver for S/390 CTC + CTCMPC (SNA)"); | |
1760 | MODULE_LICENSE("GPL"); | |
1761 |